pf.c revision 153545
1126261Smlaier/* $FreeBSD: head/sys/contrib/pf/net/pf.c 153545 2005-12-20 00:33:33Z mlaier $ */ 2145836Smlaier/* $OpenBSD: pf.c,v 1.483 2005/03/15 17:38:43 dhartmei Exp $ */ 3126258Smlaier 4126258Smlaier/* 5126258Smlaier * Copyright (c) 2001 Daniel Hartmeier 6130613Smlaier * Copyright (c) 2002,2003 Henning Brauer 7126258Smlaier * All rights reserved. 8126258Smlaier * 9126258Smlaier * Redistribution and use in source and binary forms, with or without 10126258Smlaier * modification, are permitted provided that the following conditions 11126258Smlaier * are met: 12126258Smlaier * 13126258Smlaier * - Redistributions of source code must retain the above copyright 14126258Smlaier * notice, this list of conditions and the following disclaimer. 15126258Smlaier * - Redistributions in binary form must reproduce the above 16126258Smlaier * copyright notice, this list of conditions and the following 17126258Smlaier * disclaimer in the documentation and/or other materials provided 18126258Smlaier * with the distribution. 19126258Smlaier * 20126258Smlaier * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21126258Smlaier * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22126258Smlaier * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23126258Smlaier * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24126258Smlaier * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25126258Smlaier * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26126258Smlaier * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27126258Smlaier * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28126258Smlaier * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29126258Smlaier * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 30126258Smlaier * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31126258Smlaier * POSSIBILITY OF SUCH DAMAGE. 32126258Smlaier * 33126258Smlaier * Effort sponsored in part by the Defense Advanced Research Projects 34126258Smlaier * Agency (DARPA) and Air Force Research Laboratory, Air Force 35126258Smlaier * Materiel Command, USAF, under agreement number F30602-01-2-0537. 36126258Smlaier * 37126258Smlaier */ 38126258Smlaier 39127145Smlaier#ifdef __FreeBSD__ 40126261Smlaier#include "opt_inet.h" 41126261Smlaier#include "opt_inet6.h" 42126261Smlaier#endif 43126261Smlaier 44127145Smlaier#ifdef __FreeBSD__ 45126261Smlaier#include "opt_bpf.h" 46126261Smlaier#include "opt_pf.h" 47153110Sru 48153110Sru#ifdef DEV_BPF 49127145Smlaier#define NBPFILTER DEV_BPF 50153110Sru#else 51153110Sru#define NBPFILTER 0 52153110Sru#endif 53153110Sru 54153110Sru#ifdef DEV_PFLOG 55127145Smlaier#define NPFLOG DEV_PFLOG 56153110Sru#else 57153110Sru#define NPFLOG 0 58153110Sru#endif 59153110Sru 60153110Sru#ifdef DEV_PFSYNC 61127145Smlaier#define NPFSYNC DEV_PFSYNC 62126261Smlaier#else 63153110Sru#define NPFSYNC 0 64153110Sru#endif 65153110Sru 66153110Sru#else 67126258Smlaier#include "bpfilter.h" 68126258Smlaier#include "pflog.h" 69126258Smlaier#include "pfsync.h" 70126261Smlaier#endif 71126258Smlaier 72126258Smlaier#include <sys/param.h> 73126258Smlaier#include <sys/systm.h> 74126258Smlaier#include <sys/mbuf.h> 75126258Smlaier#include <sys/filio.h> 76126258Smlaier#include <sys/socket.h> 77126258Smlaier#include <sys/socketvar.h> 78126258Smlaier#include <sys/kernel.h> 79126258Smlaier#include <sys/time.h> 80127145Smlaier#ifdef __FreeBSD__ 81126261Smlaier#include <sys/sysctl.h> 82130613Smlaier#include <sys/endian.h> 83126261Smlaier#else 84126258Smlaier#include <sys/pool.h> 85126261Smlaier#endif 86126258Smlaier 87126258Smlaier#include <net/if.h> 88126258Smlaier#include <net/if_types.h> 89126258Smlaier#include <net/bpf.h> 90126258Smlaier#include <net/route.h> 91126258Smlaier 92126258Smlaier#include <netinet/in.h> 93126258Smlaier#include <netinet/in_var.h> 94126258Smlaier#include <netinet/in_systm.h> 95126258Smlaier#include <netinet/ip.h> 96126258Smlaier#include <netinet/ip_var.h> 97126258Smlaier#include <netinet/tcp.h> 98126258Smlaier#include <netinet/tcp_seq.h> 99126258Smlaier#include <netinet/udp.h> 100126258Smlaier#include <netinet/ip_icmp.h> 101126258Smlaier#include <netinet/in_pcb.h> 102126258Smlaier#include <netinet/tcp_timer.h> 103126258Smlaier#include <netinet/tcp_var.h> 104126258Smlaier#include <netinet/udp_var.h> 105126258Smlaier#include <netinet/icmp_var.h> 106145836Smlaier#include <netinet/if_ether.h> 107126258Smlaier 108127145Smlaier#ifndef __FreeBSD__ 109126258Smlaier#include <dev/rndvar.h> 110126261Smlaier#endif 111126258Smlaier#include <net/pfvar.h> 112126258Smlaier#include <net/if_pflog.h> 113130613Smlaier 114130613Smlaier#if NPFSYNC > 0 115126258Smlaier#include <net/if_pfsync.h> 116130613Smlaier#endif /* NPFSYNC > 0 */ 117126258Smlaier 118126258Smlaier#ifdef INET6 119126258Smlaier#include <netinet/ip6.h> 120126258Smlaier#include <netinet/in_pcb.h> 121126258Smlaier#include <netinet/icmp6.h> 122126258Smlaier#include <netinet6/nd6.h> 123127145Smlaier#ifdef __FreeBSD__ 124126261Smlaier#include <netinet6/ip6_var.h> 125126261Smlaier#include <netinet6/in6_pcb.h> 126126261Smlaier#endif 127126258Smlaier#endif /* INET6 */ 128126258Smlaier 129127145Smlaier#ifdef __FreeBSD__ 130126261Smlaier#include <machine/in_cksum.h> 131126261Smlaier#include <sys/limits.h> 132126261Smlaier#include <sys/ucred.h> 133126258Smlaier 134126261Smlaierextern int ip_optcopy(struct ip *, struct ip *); 135126261Smlaier#endif 136126261Smlaier 137126258Smlaier#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x 138126258Smlaier 139126258Smlaier/* 140126258Smlaier * Global variables 141126258Smlaier */ 142126258Smlaier 143145836Smlaierstruct pf_anchor_global pf_anchors; 144126258Smlaierstruct pf_ruleset pf_main_ruleset; 145126258Smlaierstruct pf_altqqueue pf_altqs[2]; 146126258Smlaierstruct pf_palist pf_pabuf; 147126258Smlaierstruct pf_altqqueue *pf_altqs_active; 148126258Smlaierstruct pf_altqqueue *pf_altqs_inactive; 149126258Smlaierstruct pf_status pf_status; 150126258Smlaier 151126258Smlaieru_int32_t ticket_altqs_active; 152126258Smlaieru_int32_t ticket_altqs_inactive; 153130613Smlaierint altqs_inactive_open; 154126258Smlaieru_int32_t ticket_pabuf; 155126258Smlaier 156127145Smlaier#ifdef __FreeBSD__ 157126261Smlaierstruct callout pf_expire_to; /* expire timeout */ 158126261Smlaier#else 159126258Smlaierstruct timeout pf_expire_to; /* expire timeout */ 160126261Smlaier#endif 161126258Smlaier 162145836Smlaierstruct pf_anchor_stackframe { 163145836Smlaier struct pf_ruleset *rs; 164145836Smlaier struct pf_rule *r; 165145836Smlaier struct pf_anchor_node *parent; 166145836Smlaier struct pf_anchor *child; 167145836Smlaier} pf_anchor_stack[64]; 168126261Smlaier 169127145Smlaier#ifdef __FreeBSD__ 170130613Smlaieruma_zone_t pf_src_tree_pl, pf_rule_pl; 171126261Smlaieruma_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 172126261Smlaier#else 173130613Smlaierstruct pool pf_src_tree_pl, pf_rule_pl; 174126258Smlaierstruct pool pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 175126261Smlaier#endif 176126258Smlaier 177126258Smlaiervoid pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 178126258Smlaier 179145836Smlaiervoid pf_init_threshold(struct pf_threshold *, u_int32_t, 180145836Smlaier u_int32_t); 181145836Smlaiervoid pf_add_threshold(struct pf_threshold *); 182145836Smlaierint pf_check_threshold(struct pf_threshold *); 183145836Smlaier 184126258Smlaiervoid pf_change_ap(struct pf_addr *, u_int16_t *, 185126258Smlaier u_int16_t *, u_int16_t *, struct pf_addr *, 186126258Smlaier u_int16_t, u_int8_t, sa_family_t); 187126258Smlaier#ifdef INET6 188126258Smlaiervoid pf_change_a6(struct pf_addr *, u_int16_t *, 189126258Smlaier struct pf_addr *, u_int8_t); 190126258Smlaier#endif /* INET6 */ 191126258Smlaiervoid pf_change_icmp(struct pf_addr *, u_int16_t *, 192126258Smlaier struct pf_addr *, struct pf_addr *, u_int16_t, 193126258Smlaier u_int16_t *, u_int16_t *, u_int16_t *, 194126258Smlaier u_int16_t *, u_int8_t, sa_family_t); 195126258Smlaiervoid pf_send_tcp(const struct pf_rule *, sa_family_t, 196126258Smlaier const struct pf_addr *, const struct pf_addr *, 197126258Smlaier u_int16_t, u_int16_t, u_int32_t, u_int32_t, 198145836Smlaier u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 199145836Smlaier struct ether_header *, struct ifnet *); 200126258Smlaiervoid pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 201126258Smlaier sa_family_t, struct pf_rule *); 202126258Smlaierstruct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 203130613Smlaier int, int, struct pfi_kif *, 204126258Smlaier struct pf_addr *, u_int16_t, struct pf_addr *, 205126258Smlaier u_int16_t, int); 206126258Smlaierstruct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 207130613Smlaier int, int, struct pfi_kif *, struct pf_src_node **, 208126258Smlaier struct pf_addr *, u_int16_t, 209126258Smlaier struct pf_addr *, u_int16_t, 210126258Smlaier struct pf_addr *, u_int16_t *); 211126258Smlaierint pf_test_tcp(struct pf_rule **, struct pf_state **, 212130613Smlaier int, struct pfi_kif *, struct mbuf *, int, 213126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 214135920Smlaier#ifdef __FreeBSD__ 215145836Smlaier struct pf_ruleset **, struct ifqueue *, 216145836Smlaier struct inpcb *); 217135920Smlaier#else 218145836Smlaier struct pf_ruleset **, struct ifqueue *); 219135920Smlaier#endif 220126258Smlaierint pf_test_udp(struct pf_rule **, struct pf_state **, 221130613Smlaier int, struct pfi_kif *, struct mbuf *, int, 222126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 223135920Smlaier#ifdef __FreeBSD__ 224145836Smlaier struct pf_ruleset **, struct ifqueue *, 225145836Smlaier struct inpcb *); 226135920Smlaier#else 227145836Smlaier struct pf_ruleset **, struct ifqueue *); 228135920Smlaier#endif 229126258Smlaierint pf_test_icmp(struct pf_rule **, struct pf_state **, 230130613Smlaier int, struct pfi_kif *, struct mbuf *, int, 231126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 232145836Smlaier struct pf_ruleset **, struct ifqueue *); 233126258Smlaierint pf_test_other(struct pf_rule **, struct pf_state **, 234130613Smlaier int, struct pfi_kif *, struct mbuf *, int, void *, 235126258Smlaier struct pf_pdesc *, struct pf_rule **, 236145836Smlaier struct pf_ruleset **, struct ifqueue *); 237126258Smlaierint pf_test_fragment(struct pf_rule **, int, 238130613Smlaier struct pfi_kif *, struct mbuf *, void *, 239126258Smlaier struct pf_pdesc *, struct pf_rule **, 240126258Smlaier struct pf_ruleset **); 241126258Smlaierint pf_test_state_tcp(struct pf_state **, int, 242130613Smlaier struct pfi_kif *, struct mbuf *, int, 243126258Smlaier void *, struct pf_pdesc *, u_short *); 244126258Smlaierint pf_test_state_udp(struct pf_state **, int, 245130613Smlaier struct pfi_kif *, struct mbuf *, int, 246126258Smlaier void *, struct pf_pdesc *); 247126258Smlaierint pf_test_state_icmp(struct pf_state **, int, 248130613Smlaier struct pfi_kif *, struct mbuf *, int, 249145836Smlaier void *, struct pf_pdesc *, u_short *); 250126258Smlaierint pf_test_state_other(struct pf_state **, int, 251130613Smlaier struct pfi_kif *, struct pf_pdesc *); 252126258Smlaierstruct pf_tag *pf_get_tag(struct mbuf *); 253126258Smlaierint pf_match_tag(struct mbuf *, struct pf_rule *, 254145836Smlaier struct pf_tag **, int *); 255126258Smlaiervoid pf_hash(struct pf_addr *, struct pf_addr *, 256126258Smlaier struct pf_poolhashkey *, sa_family_t); 257130613Smlaierint pf_map_addr(u_int8_t, struct pf_rule *, 258126258Smlaier struct pf_addr *, struct pf_addr *, 259130613Smlaier struct pf_addr *, struct pf_src_node **); 260130613Smlaierint pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 261126258Smlaier struct pf_addr *, struct pf_addr *, u_int16_t, 262130613Smlaier struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 263130613Smlaier struct pf_src_node **); 264126258Smlaiervoid pf_route(struct mbuf **, struct pf_rule *, int, 265126258Smlaier struct ifnet *, struct pf_state *); 266126258Smlaiervoid pf_route6(struct mbuf **, struct pf_rule *, int, 267126258Smlaier struct ifnet *, struct pf_state *); 268135920Smlaier#ifdef __FreeBSD__ 269130613Smlaierint pf_socket_lookup(uid_t *, gid_t *, 270135920Smlaier int, struct pf_pdesc *, struct inpcb *); 271135920Smlaier#else 272135920Smlaierint pf_socket_lookup(uid_t *, gid_t *, 273126258Smlaier int, struct pf_pdesc *); 274135920Smlaier#endif 275126258Smlaieru_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 276126258Smlaier sa_family_t); 277126258Smlaieru_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 278126258Smlaier sa_family_t); 279126258Smlaieru_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 280126258Smlaier u_int16_t); 281126258Smlaiervoid pf_set_rt_ifp(struct pf_state *, 282126258Smlaier struct pf_addr *); 283126258Smlaierint pf_check_proto_cksum(struct mbuf *, int, int, 284126258Smlaier u_int8_t, sa_family_t); 285126258Smlaierint pf_addr_wrap_neq(struct pf_addr_wrap *, 286126258Smlaier struct pf_addr_wrap *); 287130613Smlaierstatic int pf_add_mbuf_tag(struct mbuf *, u_int); 288130613Smlaierstruct pf_state *pf_find_state_recurse(struct pfi_kif *, 289130613Smlaier struct pf_state *, u_int8_t); 290145836Smlaierint pf_src_connlimit(struct pf_state **); 291145836Smlaierint pf_check_congestion(struct ifqueue *); 292126258Smlaier 293127145Smlaier#ifdef __FreeBSD__ 294126261Smlaierint in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 295126258Smlaier 296126261Smlaierstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX]; 297145836Smlaier 298126261Smlaier#else 299130613Smlaierstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 300130613Smlaier { &pf_state_pl, PFSTATE_HIWAT }, 301130613Smlaier { &pf_src_tree_pl, PFSNODE_HIWAT }, 302130613Smlaier { &pf_frent_pl, PFFRAG_FRENT_HIWAT } 303130613Smlaier}; 304126261Smlaier#endif 305126258Smlaier 306126258Smlaier#define STATE_LOOKUP() \ 307126258Smlaier do { \ 308126258Smlaier if (direction == PF_IN) \ 309145836Smlaier *state = pf_find_state_recurse( \ 310130613Smlaier kif, &key, PF_EXT_GWY); \ 311126258Smlaier else \ 312145836Smlaier *state = pf_find_state_recurse( \ 313130613Smlaier kif, &key, PF_LAN_EXT); \ 314145836Smlaier if (*state == NULL || (*state)->timeout == PFTM_PURGE) \ 315126258Smlaier return (PF_DROP); \ 316126258Smlaier if (direction == PF_OUT && \ 317126258Smlaier (((*state)->rule.ptr->rt == PF_ROUTETO && \ 318126258Smlaier (*state)->rule.ptr->direction == PF_OUT) || \ 319126258Smlaier ((*state)->rule.ptr->rt == PF_REPLYTO && \ 320126258Smlaier (*state)->rule.ptr->direction == PF_IN)) && \ 321130613Smlaier (*state)->rt_kif != NULL && \ 322130613Smlaier (*state)->rt_kif != kif) \ 323126258Smlaier return (PF_PASS); \ 324126258Smlaier } while (0) 325126258Smlaier 326126258Smlaier#define STATE_TRANSLATE(s) \ 327126258Smlaier (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ 328126258Smlaier ((s)->af == AF_INET6 && \ 329126258Smlaier ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ 330126258Smlaier (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ 331126258Smlaier (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ 332126258Smlaier (s)->lan.port != (s)->gwy.port 333126258Smlaier 334130613Smlaier#define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) : \ 335130613Smlaier ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent : \ 336130613Smlaier (k)->pfik_parent->pfik_parent) 337126258Smlaier 338145836Smlaier#define STATE_INC_COUNTERS(s) \ 339145836Smlaier do { \ 340145836Smlaier s->rule.ptr->states++; \ 341145836Smlaier if (s->anchor.ptr != NULL) \ 342145836Smlaier s->anchor.ptr->states++; \ 343145836Smlaier if (s->nat_rule.ptr != NULL) \ 344145836Smlaier s->nat_rule.ptr->states++; \ 345145836Smlaier } while (0) 346145836Smlaier 347145836Smlaier#define STATE_DEC_COUNTERS(s) \ 348145836Smlaier do { \ 349145836Smlaier if (s->nat_rule.ptr != NULL) \ 350145836Smlaier s->nat_rule.ptr->states--; \ 351145836Smlaier if (s->anchor.ptr != NULL) \ 352145836Smlaier s->anchor.ptr->states--; \ 353145836Smlaier s->rule.ptr->states--; \ 354145836Smlaier } while (0) 355145836Smlaier 356132767Skan#ifndef __FreeBSD__ 357130613Smlaierstatic __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 358130613Smlaierstatic __inline int pf_state_compare_lan_ext(struct pf_state *, 359130613Smlaier struct pf_state *); 360130613Smlaierstatic __inline int pf_state_compare_ext_gwy(struct pf_state *, 361130613Smlaier struct pf_state *); 362130613Smlaierstatic __inline int pf_state_compare_id(struct pf_state *, 363130613Smlaier struct pf_state *); 364145836Smlaierstatic __inline int pf_anchor_compare(struct pf_anchor *, struct pf_anchor *); 365132767Skan#else 366132767Skanstatic int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 367132767Skanstatic int pf_state_compare_lan_ext(struct pf_state *, 368132767Skan struct pf_state *); 369132767Skanstatic int pf_state_compare_ext_gwy(struct pf_state *, 370132767Skan struct pf_state *); 371132767Skanstatic int pf_state_compare_id(struct pf_state *, 372132767Skan struct pf_state *); 373145836Smlaierstatic int pf_anchor_compare(struct pf_anchor *, struct pf_anchor *); 374132767Skan#endif 375126258Smlaier 376130613Smlaierstruct pf_src_tree tree_src_tracking; 377130613Smlaier 378130613Smlaierstruct pf_state_tree_id tree_id; 379130613Smlaierstruct pf_state_queue state_updates; 380130613Smlaier 381130613SmlaierRB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 382130613SmlaierRB_GENERATE(pf_state_tree_lan_ext, pf_state, 383130613Smlaier u.s.entry_lan_ext, pf_state_compare_lan_ext); 384130613SmlaierRB_GENERATE(pf_state_tree_ext_gwy, pf_state, 385130613Smlaier u.s.entry_ext_gwy, pf_state_compare_ext_gwy); 386130613SmlaierRB_GENERATE(pf_state_tree_id, pf_state, 387130613Smlaier u.s.entry_id, pf_state_compare_id); 388145836SmlaierRB_GENERATE(pf_anchor_global, pf_anchor, entry_global, pf_anchor_compare); 389145836SmlaierRB_GENERATE(pf_anchor_node, pf_anchor, entry_node, pf_anchor_compare); 390130613Smlaier 391127145Smlaier#ifdef __FreeBSD__ 392126409Smlaierstatic int 393126409Smlaier#else 394126258Smlaierstatic __inline int 395126409Smlaier#endif 396130613Smlaierpf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 397126258Smlaier{ 398126258Smlaier int diff; 399126258Smlaier 400130613Smlaier if (a->rule.ptr > b->rule.ptr) 401130613Smlaier return (1); 402130613Smlaier if (a->rule.ptr < b->rule.ptr) 403130613Smlaier return (-1); 404130613Smlaier if ((diff = a->af - b->af) != 0) 405130613Smlaier return (diff); 406130613Smlaier switch (a->af) { 407130613Smlaier#ifdef INET 408130613Smlaier case AF_INET: 409130613Smlaier if (a->addr.addr32[0] > b->addr.addr32[0]) 410130613Smlaier return (1); 411130613Smlaier if (a->addr.addr32[0] < b->addr.addr32[0]) 412130613Smlaier return (-1); 413130613Smlaier break; 414130613Smlaier#endif /* INET */ 415130613Smlaier#ifdef INET6 416130613Smlaier case AF_INET6: 417130613Smlaier if (a->addr.addr32[3] > b->addr.addr32[3]) 418130613Smlaier return (1); 419130613Smlaier if (a->addr.addr32[3] < b->addr.addr32[3]) 420130613Smlaier return (-1); 421130613Smlaier if (a->addr.addr32[2] > b->addr.addr32[2]) 422130613Smlaier return (1); 423130613Smlaier if (a->addr.addr32[2] < b->addr.addr32[2]) 424130613Smlaier return (-1); 425130613Smlaier if (a->addr.addr32[1] > b->addr.addr32[1]) 426130613Smlaier return (1); 427130613Smlaier if (a->addr.addr32[1] < b->addr.addr32[1]) 428130613Smlaier return (-1); 429130613Smlaier if (a->addr.addr32[0] > b->addr.addr32[0]) 430130613Smlaier return (1); 431130613Smlaier if (a->addr.addr32[0] < b->addr.addr32[0]) 432130613Smlaier return (-1); 433130613Smlaier break; 434130613Smlaier#endif /* INET6 */ 435130613Smlaier } 436130613Smlaier return (0); 437130613Smlaier} 438130613Smlaier 439130613Smlaier#ifdef __FreeBSD__ 440130613Smlaierstatic int 441130613Smlaier#else 442130613Smlaierstatic __inline int 443130613Smlaier#endif 444130613Smlaierpf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b) 445130613Smlaier{ 446130613Smlaier int diff; 447130613Smlaier 448126258Smlaier if ((diff = a->proto - b->proto) != 0) 449126258Smlaier return (diff); 450126258Smlaier if ((diff = a->af - b->af) != 0) 451126258Smlaier return (diff); 452126258Smlaier switch (a->af) { 453126258Smlaier#ifdef INET 454126258Smlaier case AF_INET: 455130613Smlaier if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 456126258Smlaier return (1); 457130613Smlaier if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 458126258Smlaier return (-1); 459130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 460126258Smlaier return (1); 461130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 462126258Smlaier return (-1); 463126258Smlaier break; 464126258Smlaier#endif /* INET */ 465126258Smlaier#ifdef INET6 466126258Smlaier case AF_INET6: 467130613Smlaier if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 468126258Smlaier return (1); 469130613Smlaier if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 470126258Smlaier return (-1); 471130613Smlaier if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 472126258Smlaier return (1); 473130613Smlaier if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 474126258Smlaier return (-1); 475130613Smlaier if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 476126258Smlaier return (1); 477130613Smlaier if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 478126258Smlaier return (-1); 479130613Smlaier if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 480126258Smlaier return (1); 481130613Smlaier if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 482126258Smlaier return (-1); 483130613Smlaier if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 484126258Smlaier return (1); 485130613Smlaier if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 486126258Smlaier return (-1); 487130613Smlaier if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 488126258Smlaier return (1); 489130613Smlaier if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 490126258Smlaier return (-1); 491130613Smlaier if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 492126258Smlaier return (1); 493130613Smlaier if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 494126258Smlaier return (-1); 495130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 496126258Smlaier return (1); 497130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 498126258Smlaier return (-1); 499126258Smlaier break; 500126258Smlaier#endif /* INET6 */ 501126258Smlaier } 502126258Smlaier 503130613Smlaier if ((diff = a->lan.port - b->lan.port) != 0) 504126258Smlaier return (diff); 505130613Smlaier if ((diff = a->ext.port - b->ext.port) != 0) 506126258Smlaier return (diff); 507126258Smlaier 508126258Smlaier return (0); 509126258Smlaier} 510126258Smlaier 511130613Smlaier#ifdef __FreeBSD__ 512130613Smlaierstatic int 513130613Smlaier#else 514130613Smlaierstatic __inline int 515130613Smlaier#endif 516130613Smlaierpf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b) 517130613Smlaier{ 518130613Smlaier int diff; 519130613Smlaier 520130613Smlaier if ((diff = a->proto - b->proto) != 0) 521130613Smlaier return (diff); 522130613Smlaier if ((diff = a->af - b->af) != 0) 523130613Smlaier return (diff); 524130613Smlaier switch (a->af) { 525130613Smlaier#ifdef INET 526130613Smlaier case AF_INET: 527130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 528130613Smlaier return (1); 529130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 530130613Smlaier return (-1); 531130613Smlaier if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 532130613Smlaier return (1); 533130613Smlaier if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 534130613Smlaier return (-1); 535130613Smlaier break; 536130613Smlaier#endif /* INET */ 537126258Smlaier#ifdef INET6 538130613Smlaier case AF_INET6: 539130613Smlaier if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 540130613Smlaier return (1); 541130613Smlaier if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 542130613Smlaier return (-1); 543130613Smlaier if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 544130613Smlaier return (1); 545130613Smlaier if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 546130613Smlaier return (-1); 547130613Smlaier if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 548130613Smlaier return (1); 549130613Smlaier if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 550130613Smlaier return (-1); 551130613Smlaier if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 552130613Smlaier return (1); 553130613Smlaier if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 554130613Smlaier return (-1); 555130613Smlaier if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 556130613Smlaier return (1); 557130613Smlaier if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 558130613Smlaier return (-1); 559130613Smlaier if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 560130613Smlaier return (1); 561130613Smlaier if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 562130613Smlaier return (-1); 563130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 564130613Smlaier return (1); 565130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 566130613Smlaier return (-1); 567130613Smlaier if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 568130613Smlaier return (1); 569130613Smlaier if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 570130613Smlaier return (-1); 571130613Smlaier break; 572130613Smlaier#endif /* INET6 */ 573130613Smlaier } 574130613Smlaier 575130613Smlaier if ((diff = a->ext.port - b->ext.port) != 0) 576130613Smlaier return (diff); 577130613Smlaier if ((diff = a->gwy.port - b->gwy.port) != 0) 578130613Smlaier return (diff); 579130613Smlaier 580130613Smlaier return (0); 581130613Smlaier} 582130613Smlaier 583130613Smlaier#ifdef __FreeBSD__ 584130613Smlaierstatic int 585130613Smlaier#else 586130613Smlaierstatic __inline int 587130613Smlaier#endif 588130613Smlaierpf_state_compare_id(struct pf_state *a, struct pf_state *b) 589130613Smlaier{ 590130613Smlaier if (a->id > b->id) 591130613Smlaier return (1); 592130613Smlaier if (a->id < b->id) 593130613Smlaier return (-1); 594130613Smlaier if (a->creatorid > b->creatorid) 595130613Smlaier return (1); 596130613Smlaier if (a->creatorid < b->creatorid) 597130613Smlaier return (-1); 598130613Smlaier 599130613Smlaier return (0); 600130613Smlaier} 601130613Smlaier 602145836Smlaier#ifdef __FreeBSD__ 603145836Smlaierstatic int 604145836Smlaier#else 605145836Smlaierstatic __inline int 606145836Smlaier#endif 607145836Smlaierpf_anchor_compare(struct pf_anchor *a, struct pf_anchor *b) 608145836Smlaier{ 609145836Smlaier int c = strcmp(a->path, b->path); 610145836Smlaier 611145836Smlaier return (c ? (c < 0 ? -1 : 1) : 0); 612145836Smlaier} 613145836Smlaier 614130613Smlaier#ifdef INET6 615126258Smlaiervoid 616126258Smlaierpf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 617126258Smlaier{ 618126258Smlaier switch (af) { 619126258Smlaier#ifdef INET 620126258Smlaier case AF_INET: 621126258Smlaier dst->addr32[0] = src->addr32[0]; 622126258Smlaier break; 623126258Smlaier#endif /* INET */ 624126258Smlaier case AF_INET6: 625126258Smlaier dst->addr32[0] = src->addr32[0]; 626126258Smlaier dst->addr32[1] = src->addr32[1]; 627126258Smlaier dst->addr32[2] = src->addr32[2]; 628126258Smlaier dst->addr32[3] = src->addr32[3]; 629126258Smlaier break; 630126258Smlaier } 631126258Smlaier} 632145836Smlaier#endif /* INET6 */ 633126258Smlaier 634126258Smlaierstruct pf_state * 635130613Smlaierpf_find_state_byid(struct pf_state *key) 636126258Smlaier{ 637130613Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 638130613Smlaier return (RB_FIND(pf_state_tree_id, &tree_id, key)); 639130613Smlaier} 640126258Smlaier 641130613Smlaierstruct pf_state * 642130613Smlaierpf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree) 643130613Smlaier{ 644130613Smlaier struct pf_state *s; 645130613Smlaier 646126258Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 647130613Smlaier 648130613Smlaier switch (tree) { 649130613Smlaier case PF_LAN_EXT: 650130613Smlaier for (; kif != NULL; kif = kif->pfik_parent) { 651130613Smlaier s = RB_FIND(pf_state_tree_lan_ext, 652130613Smlaier &kif->pfik_lan_ext, key); 653130613Smlaier if (s != NULL) 654130613Smlaier return (s); 655130613Smlaier } 656126258Smlaier return (NULL); 657130613Smlaier case PF_EXT_GWY: 658130613Smlaier for (; kif != NULL; kif = kif->pfik_parent) { 659130613Smlaier s = RB_FIND(pf_state_tree_ext_gwy, 660130613Smlaier &kif->pfik_ext_gwy, key); 661130613Smlaier if (s != NULL) 662130613Smlaier return (s); 663130613Smlaier } 664130613Smlaier return (NULL); 665130613Smlaier default: 666130613Smlaier panic("pf_find_state_recurse"); 667130613Smlaier } 668126258Smlaier} 669126258Smlaier 670130613Smlaierstruct pf_state * 671130613Smlaierpf_find_state_all(struct pf_state *key, u_int8_t tree, int *more) 672130613Smlaier{ 673130613Smlaier struct pf_state *s, *ss = NULL; 674130613Smlaier struct pfi_kif *kif; 675130613Smlaier 676130613Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 677130613Smlaier 678130613Smlaier switch (tree) { 679130613Smlaier case PF_LAN_EXT: 680130613Smlaier TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 681130613Smlaier s = RB_FIND(pf_state_tree_lan_ext, 682130613Smlaier &kif->pfik_lan_ext, key); 683130613Smlaier if (s == NULL) 684130613Smlaier continue; 685130613Smlaier if (more == NULL) 686130613Smlaier return (s); 687130613Smlaier ss = s; 688130613Smlaier (*more)++; 689130613Smlaier } 690130613Smlaier return (ss); 691130613Smlaier case PF_EXT_GWY: 692130613Smlaier TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 693130613Smlaier s = RB_FIND(pf_state_tree_ext_gwy, 694130613Smlaier &kif->pfik_ext_gwy, key); 695130613Smlaier if (s == NULL) 696130613Smlaier continue; 697130613Smlaier if (more == NULL) 698130613Smlaier return (s); 699130613Smlaier ss = s; 700130613Smlaier (*more)++; 701130613Smlaier } 702130613Smlaier return (ss); 703130613Smlaier default: 704130613Smlaier panic("pf_find_state_all"); 705130613Smlaier } 706130613Smlaier} 707130613Smlaier 708145836Smlaiervoid 709145836Smlaierpf_init_threshold(struct pf_threshold *threshold, 710145836Smlaier u_int32_t limit, u_int32_t seconds) 711145836Smlaier{ 712145836Smlaier threshold->limit = limit * PF_THRESHOLD_MULT; 713145836Smlaier threshold->seconds = seconds; 714145836Smlaier threshold->count = 0; 715145836Smlaier threshold->last = time_second; 716145836Smlaier} 717145836Smlaier 718145836Smlaiervoid 719145836Smlaierpf_add_threshold(struct pf_threshold *threshold) 720145836Smlaier{ 721145836Smlaier u_int32_t t = time_second, diff = t - threshold->last; 722145836Smlaier 723145836Smlaier if (diff >= threshold->seconds) 724145836Smlaier threshold->count = 0; 725145836Smlaier else 726145836Smlaier threshold->count -= threshold->count * diff / 727145836Smlaier threshold->seconds; 728145836Smlaier threshold->count += PF_THRESHOLD_MULT; 729145836Smlaier threshold->last = t; 730145836Smlaier} 731145836Smlaier 732126258Smlaierint 733145836Smlaierpf_check_threshold(struct pf_threshold *threshold) 734145836Smlaier{ 735145836Smlaier return (threshold->count > threshold->limit); 736145836Smlaier} 737145836Smlaier 738145836Smlaierint 739145836Smlaierpf_src_connlimit(struct pf_state **state) 740145836Smlaier{ 741145836Smlaier struct pf_state *s; 742145836Smlaier int bad = 0; 743145836Smlaier 744145836Smlaier (*state)->src_node->conn++; 745145836Smlaier pf_add_threshold(&(*state)->src_node->conn_rate); 746145836Smlaier 747145836Smlaier if ((*state)->rule.ptr->max_src_conn && 748145836Smlaier (*state)->rule.ptr->max_src_conn < 749145836Smlaier (*state)->src_node->conn) { 750145836Smlaier pf_status.lcounters[LCNT_SRCCONN]++; 751145836Smlaier bad++; 752145836Smlaier } 753145836Smlaier 754145836Smlaier if ((*state)->rule.ptr->max_src_conn_rate.limit && 755145836Smlaier pf_check_threshold(&(*state)->src_node->conn_rate)) { 756145836Smlaier pf_status.lcounters[LCNT_SRCCONNRATE]++; 757145836Smlaier bad++; 758145836Smlaier } 759145836Smlaier 760145836Smlaier if (!bad) 761145836Smlaier return (0); 762145836Smlaier 763145836Smlaier if ((*state)->rule.ptr->overload_tbl) { 764145836Smlaier struct pfr_addr p; 765145836Smlaier u_int32_t killed = 0; 766145836Smlaier 767145836Smlaier pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 768145836Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 769145836Smlaier printf("pf_src_connlimit: blocking address "); 770145836Smlaier pf_print_host(&(*state)->src_node->addr, 0, 771145836Smlaier (*state)->af); 772145836Smlaier } 773145836Smlaier 774145836Smlaier bzero(&p, sizeof(p)); 775145836Smlaier p.pfra_af = (*state)->af; 776145836Smlaier switch ((*state)->af) { 777145836Smlaier#ifdef INET 778145836Smlaier case AF_INET: 779145836Smlaier p.pfra_net = 32; 780145836Smlaier p.pfra_ip4addr = (*state)->src_node->addr.v4; 781145836Smlaier break; 782145836Smlaier#endif /* INET */ 783145836Smlaier#ifdef INET6 784145836Smlaier case AF_INET6: 785145836Smlaier p.pfra_net = 128; 786145836Smlaier p.pfra_ip6addr = (*state)->src_node->addr.v6; 787145836Smlaier break; 788145836Smlaier#endif /* INET6 */ 789145836Smlaier } 790145836Smlaier 791145836Smlaier pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 792145836Smlaier &p, time_second); 793145836Smlaier 794145836Smlaier /* kill existing states if that's required. */ 795145836Smlaier if ((*state)->rule.ptr->flush) { 796145836Smlaier pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 797145836Smlaier 798145836Smlaier RB_FOREACH(s, pf_state_tree_id, &tree_id) { 799145836Smlaier /* 800145836Smlaier * Kill states from this source. (Only those 801145836Smlaier * from the same rule if PF_FLUSH_GLOBAL is not 802145836Smlaier * set) 803145836Smlaier */ 804145836Smlaier if (s->af == (*state)->af && 805145836Smlaier (((*state)->direction == PF_OUT && 806145836Smlaier PF_AEQ(&(*state)->src_node->addr, 807145836Smlaier &s->lan.addr, s->af)) || 808145836Smlaier ((*state)->direction == PF_IN && 809145836Smlaier PF_AEQ(&(*state)->src_node->addr, 810145836Smlaier &s->ext.addr, s->af))) && 811145836Smlaier ((*state)->rule.ptr->flush & 812145836Smlaier PF_FLUSH_GLOBAL || 813145836Smlaier (*state)->rule.ptr == s->rule.ptr)) { 814145836Smlaier s->timeout = PFTM_PURGE; 815145836Smlaier s->src.state = s->dst.state = 816145836Smlaier TCPS_CLOSED; 817145836Smlaier killed++; 818145836Smlaier } 819145836Smlaier } 820145836Smlaier if (pf_status.debug >= PF_DEBUG_MISC) 821145836Smlaier printf(", %u states killed", killed); 822145836Smlaier } 823145836Smlaier if (pf_status.debug >= PF_DEBUG_MISC) 824145836Smlaier printf("\n"); 825145836Smlaier } 826145836Smlaier 827145836Smlaier /* kill this state */ 828145836Smlaier (*state)->timeout = PFTM_PURGE; 829145836Smlaier (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 830145836Smlaier return (1); 831145836Smlaier} 832145836Smlaier 833145836Smlaierint 834130613Smlaierpf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 835130613Smlaier struct pf_addr *src, sa_family_t af) 836126258Smlaier{ 837130613Smlaier struct pf_src_node k; 838126258Smlaier 839130613Smlaier if (*sn == NULL) { 840130613Smlaier k.af = af; 841130613Smlaier PF_ACPY(&k.addr, src, af); 842130613Smlaier if (rule->rule_flag & PFRULE_RULESRCTRACK || 843130613Smlaier rule->rpool.opts & PF_POOL_STICKYADDR) 844130613Smlaier k.rule.ptr = rule; 845130613Smlaier else 846130613Smlaier k.rule.ptr = NULL; 847130613Smlaier pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 848130613Smlaier *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 849130613Smlaier } 850130613Smlaier if (*sn == NULL) { 851130613Smlaier if (!rule->max_src_nodes || 852130613Smlaier rule->src_nodes < rule->max_src_nodes) 853130613Smlaier (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 854145836Smlaier else 855145836Smlaier pf_status.lcounters[LCNT_SRCNODES]++; 856130613Smlaier if ((*sn) == NULL) 857130613Smlaier return (-1); 858130613Smlaier bzero(*sn, sizeof(struct pf_src_node)); 859145836Smlaier 860145836Smlaier pf_init_threshold(&(*sn)->conn_rate, 861145836Smlaier rule->max_src_conn_rate.limit, 862145836Smlaier rule->max_src_conn_rate.seconds); 863145836Smlaier 864130613Smlaier (*sn)->af = af; 865130613Smlaier if (rule->rule_flag & PFRULE_RULESRCTRACK || 866130613Smlaier rule->rpool.opts & PF_POOL_STICKYADDR) 867130613Smlaier (*sn)->rule.ptr = rule; 868130613Smlaier else 869130613Smlaier (*sn)->rule.ptr = NULL; 870130613Smlaier PF_ACPY(&(*sn)->addr, src, af); 871130613Smlaier if (RB_INSERT(pf_src_tree, 872130613Smlaier &tree_src_tracking, *sn) != NULL) { 873130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 874130613Smlaier printf("pf: src_tree insert failed: "); 875130613Smlaier pf_print_host(&(*sn)->addr, 0, af); 876130613Smlaier printf("\n"); 877130613Smlaier } 878130613Smlaier pool_put(&pf_src_tree_pl, *sn); 879130613Smlaier return (-1); 880130613Smlaier } 881130613Smlaier (*sn)->creation = time_second; 882130613Smlaier (*sn)->ruletype = rule->action; 883130613Smlaier if ((*sn)->rule.ptr != NULL) 884130613Smlaier (*sn)->rule.ptr->src_nodes++; 885130613Smlaier pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 886130613Smlaier pf_status.src_nodes++; 887130613Smlaier } else { 888130613Smlaier if (rule->max_src_states && 889145836Smlaier (*sn)->states >= rule->max_src_states) { 890145836Smlaier pf_status.lcounters[LCNT_SRCSTATES]++; 891130613Smlaier return (-1); 892145836Smlaier } 893130613Smlaier } 894130613Smlaier return (0); 895130613Smlaier} 896126258Smlaier 897130613Smlaierint 898130613Smlaierpf_insert_state(struct pfi_kif *kif, struct pf_state *state) 899130613Smlaier{ 900126258Smlaier /* Thou MUST NOT insert multiple duplicate keys */ 901130613Smlaier state->u.s.kif = kif; 902130613Smlaier if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) { 903126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 904126258Smlaier printf("pf: state insert failed: tree_lan_ext"); 905126258Smlaier printf(" lan: "); 906126258Smlaier pf_print_host(&state->lan.addr, state->lan.port, 907126258Smlaier state->af); 908126258Smlaier printf(" gwy: "); 909126258Smlaier pf_print_host(&state->gwy.addr, state->gwy.port, 910126258Smlaier state->af); 911126258Smlaier printf(" ext: "); 912126258Smlaier pf_print_host(&state->ext.addr, state->ext.port, 913126258Smlaier state->af); 914130613Smlaier if (state->sync_flags & PFSTATE_FROMSYNC) 915130613Smlaier printf(" (from sync)"); 916126258Smlaier printf("\n"); 917126258Smlaier } 918126258Smlaier return (-1); 919126258Smlaier } 920126258Smlaier 921130613Smlaier if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) { 922126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 923126258Smlaier printf("pf: state insert failed: tree_ext_gwy"); 924126258Smlaier printf(" lan: "); 925126258Smlaier pf_print_host(&state->lan.addr, state->lan.port, 926126258Smlaier state->af); 927126258Smlaier printf(" gwy: "); 928126258Smlaier pf_print_host(&state->gwy.addr, state->gwy.port, 929126258Smlaier state->af); 930126258Smlaier printf(" ext: "); 931126258Smlaier pf_print_host(&state->ext.addr, state->ext.port, 932126258Smlaier state->af); 933130613Smlaier if (state->sync_flags & PFSTATE_FROMSYNC) 934130613Smlaier printf(" (from sync)"); 935126258Smlaier printf("\n"); 936126258Smlaier } 937130613Smlaier RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 938126258Smlaier return (-1); 939126258Smlaier } 940126258Smlaier 941130613Smlaier if (state->id == 0 && state->creatorid == 0) { 942130613Smlaier state->id = htobe64(pf_status.stateid++); 943130613Smlaier state->creatorid = pf_status.hostid; 944130613Smlaier } 945130613Smlaier if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) { 946130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 947130613Smlaier#ifdef __FreeBSD__ 948130613Smlaier printf("pf: state insert failed: " 949130613Smlaier "id: %016llx creatorid: %08x", 950130613Smlaier (long long)be64toh(state->id), 951130613Smlaier ntohl(state->creatorid)); 952130613Smlaier#else 953130613Smlaier printf("pf: state insert failed: " 954130613Smlaier "id: %016llx creatorid: %08x", 955130613Smlaier betoh64(state->id), ntohl(state->creatorid)); 956130613Smlaier#endif 957130613Smlaier if (state->sync_flags & PFSTATE_FROMSYNC) 958130613Smlaier printf(" (from sync)"); 959130613Smlaier printf("\n"); 960130613Smlaier } 961130613Smlaier RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 962130613Smlaier RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state); 963130613Smlaier return (-1); 964130613Smlaier } 965130613Smlaier TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates); 966130613Smlaier 967126258Smlaier pf_status.fcounters[FCNT_STATE_INSERT]++; 968126258Smlaier pf_status.states++; 969130613Smlaier pfi_attach_state(kif); 970126258Smlaier#if NPFSYNC 971126258Smlaier pfsync_insert_state(state); 972126258Smlaier#endif 973126258Smlaier return (0); 974126258Smlaier} 975126258Smlaier 976126258Smlaiervoid 977126258Smlaierpf_purge_timeout(void *arg) 978126258Smlaier{ 979127145Smlaier#ifdef __FreeBSD__ 980126261Smlaier struct callout *to = arg; 981126261Smlaier#else 982126258Smlaier struct timeout *to = arg; 983126261Smlaier#endif 984126258Smlaier int s; 985126258Smlaier 986127145Smlaier#ifdef __FreeBSD__ 987126261Smlaier PF_LOCK(); 988126261Smlaier#endif 989126258Smlaier s = splsoftnet(); 990126258Smlaier pf_purge_expired_states(); 991126258Smlaier pf_purge_expired_fragments(); 992130613Smlaier pf_purge_expired_src_nodes(); 993126258Smlaier splx(s); 994127145Smlaier#ifdef __FreeBSD__ 995126261Smlaier PF_UNLOCK(); 996126261Smlaier#endif 997126258Smlaier 998127145Smlaier#ifdef __FreeBSD__ 999126261Smlaier callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz, 1000126261Smlaier pf_purge_timeout, to); 1001126261Smlaier#else 1002126258Smlaier timeout_add(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz); 1003126261Smlaier#endif 1004126258Smlaier} 1005126258Smlaier 1006126258Smlaieru_int32_t 1007126258Smlaierpf_state_expires(const struct pf_state *state) 1008126258Smlaier{ 1009126258Smlaier u_int32_t timeout; 1010126258Smlaier u_int32_t start; 1011126258Smlaier u_int32_t end; 1012126258Smlaier u_int32_t states; 1013126258Smlaier 1014126258Smlaier /* handle all PFTM_* > PFTM_MAX here */ 1015126258Smlaier if (state->timeout == PFTM_PURGE) 1016126261Smlaier return (time_second); 1017126258Smlaier if (state->timeout == PFTM_UNTIL_PACKET) 1018126258Smlaier return (0); 1019127145Smlaier#ifdef __FreeBSD__ 1020126261Smlaier KASSERT((state->timeout < PFTM_MAX), 1021126261Smlaier ("pf_state_expires: timeout > PFTM_MAX")); 1022126261Smlaier#else 1023126258Smlaier KASSERT(state->timeout < PFTM_MAX); 1024126261Smlaier#endif 1025126258Smlaier timeout = state->rule.ptr->timeout[state->timeout]; 1026126258Smlaier if (!timeout) 1027126258Smlaier timeout = pf_default_rule.timeout[state->timeout]; 1028126258Smlaier start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1029126258Smlaier if (start) { 1030126258Smlaier end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1031126258Smlaier states = state->rule.ptr->states; 1032126258Smlaier } else { 1033126258Smlaier start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1034126258Smlaier end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1035126258Smlaier states = pf_status.states; 1036126258Smlaier } 1037126258Smlaier if (end && states > start && start < end) { 1038126258Smlaier if (states < end) 1039126258Smlaier return (state->expire + timeout * (end - states) / 1040126258Smlaier (end - start)); 1041126258Smlaier else 1042126261Smlaier return (time_second); 1043126258Smlaier } 1044126258Smlaier return (state->expire + timeout); 1045126258Smlaier} 1046126258Smlaier 1047126258Smlaiervoid 1048130613Smlaierpf_purge_expired_src_nodes(void) 1049126258Smlaier{ 1050130613Smlaier struct pf_src_node *cur, *next; 1051126258Smlaier 1052130613Smlaier for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1053130613Smlaier next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1054126258Smlaier 1055130613Smlaier if (cur->states <= 0 && cur->expire <= time_second) { 1056130613Smlaier if (cur->rule.ptr != NULL) { 1057130613Smlaier cur->rule.ptr->src_nodes--; 1058130613Smlaier if (cur->rule.ptr->states <= 0 && 1059130613Smlaier cur->rule.ptr->max_src_nodes <= 0) 1060130613Smlaier pf_rm_rule(NULL, cur->rule.ptr); 1061130613Smlaier } 1062130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1063130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1064130613Smlaier pf_status.src_nodes--; 1065130613Smlaier pool_put(&pf_src_tree_pl, cur); 1066130613Smlaier } 1067130613Smlaier } 1068130613Smlaier} 1069126258Smlaier 1070130613Smlaiervoid 1071130613Smlaierpf_src_tree_remove_state(struct pf_state *s) 1072130613Smlaier{ 1073130613Smlaier u_int32_t timeout; 1074126258Smlaier 1075130613Smlaier if (s->src_node != NULL) { 1076145836Smlaier if (s->proto == IPPROTO_TCP) { 1077145836Smlaier if (s->src.state == PF_TCPS_PROXY_DST || 1078145836Smlaier s->timeout >= PFTM_TCP_ESTABLISHED) 1079145836Smlaier --s->src_node->conn; 1080145836Smlaier } 1081130613Smlaier if (--s->src_node->states <= 0) { 1082130613Smlaier timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1083130613Smlaier if (!timeout) 1084130613Smlaier timeout = 1085130613Smlaier pf_default_rule.timeout[PFTM_SRC_NODE]; 1086130613Smlaier s->src_node->expire = time_second + timeout; 1087130613Smlaier } 1088130613Smlaier } 1089130613Smlaier if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1090130613Smlaier if (--s->nat_src_node->states <= 0) { 1091130613Smlaier timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1092130613Smlaier if (!timeout) 1093130613Smlaier timeout = 1094130613Smlaier pf_default_rule.timeout[PFTM_SRC_NODE]; 1095130613Smlaier s->nat_src_node->expire = time_second + timeout; 1096130613Smlaier } 1097130613Smlaier } 1098130613Smlaier s->src_node = s->nat_src_node = NULL; 1099130613Smlaier} 1100126258Smlaier 1101130613Smlaiervoid 1102145836Smlaierpf_purge_expired_state(struct pf_state *cur) 1103145836Smlaier{ 1104148196Smlaier#ifdef __FreeBSD__ 1105153545Smlaier if (cur->local_flags & PFSTATE_EXPIRING) 1106148196Smlaier return; 1107153545Smlaier cur->local_flags |= PFSTATE_EXPIRING; 1108148196Smlaier#endif 1109145836Smlaier if (cur->src.state == PF_TCPS_PROXY_DST) 1110145836Smlaier pf_send_tcp(cur->rule.ptr, cur->af, 1111145836Smlaier &cur->ext.addr, &cur->lan.addr, 1112145836Smlaier cur->ext.port, cur->lan.port, 1113145836Smlaier cur->src.seqhi, cur->src.seqlo + 1, 1114145836Smlaier TH_RST|TH_ACK, 0, 0, 0, 1, NULL, NULL); 1115145836Smlaier RB_REMOVE(pf_state_tree_ext_gwy, 1116145836Smlaier &cur->u.s.kif->pfik_ext_gwy, cur); 1117145836Smlaier RB_REMOVE(pf_state_tree_lan_ext, 1118145836Smlaier &cur->u.s.kif->pfik_lan_ext, cur); 1119145836Smlaier RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1120145836Smlaier#if NPFSYNC 1121145836Smlaier pfsync_delete_state(cur); 1122145836Smlaier#endif 1123145836Smlaier pf_src_tree_remove_state(cur); 1124145836Smlaier if (--cur->rule.ptr->states <= 0 && 1125145836Smlaier cur->rule.ptr->src_nodes <= 0) 1126145836Smlaier pf_rm_rule(NULL, cur->rule.ptr); 1127145836Smlaier if (cur->nat_rule.ptr != NULL) 1128145836Smlaier if (--cur->nat_rule.ptr->states <= 0 && 1129145836Smlaier cur->nat_rule.ptr->src_nodes <= 0) 1130145836Smlaier pf_rm_rule(NULL, cur->nat_rule.ptr); 1131145836Smlaier if (cur->anchor.ptr != NULL) 1132145836Smlaier if (--cur->anchor.ptr->states <= 0) 1133145836Smlaier pf_rm_rule(NULL, cur->anchor.ptr); 1134145836Smlaier pf_normalize_tcp_cleanup(cur); 1135145836Smlaier pfi_detach_state(cur->u.s.kif); 1136145836Smlaier TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates); 1137145836Smlaier if (cur->tag) 1138145836Smlaier pf_tag_unref(cur->tag); 1139145836Smlaier pool_put(&pf_state_pl, cur); 1140145836Smlaier pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1141145836Smlaier pf_status.states--; 1142145836Smlaier} 1143145836Smlaier 1144145836Smlaiervoid 1145130613Smlaierpf_purge_expired_states(void) 1146130613Smlaier{ 1147130613Smlaier struct pf_state *cur, *next; 1148130613Smlaier 1149130613Smlaier for (cur = RB_MIN(pf_state_tree_id, &tree_id); 1150130613Smlaier cur; cur = next) { 1151130613Smlaier next = RB_NEXT(pf_state_tree_id, &tree_id, cur); 1152145836Smlaier if (pf_state_expires(cur) <= time_second) 1153145836Smlaier pf_purge_expired_state(cur); 1154126258Smlaier } 1155126258Smlaier} 1156126258Smlaier 1157126258Smlaierint 1158126258Smlaierpf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1159126258Smlaier{ 1160126258Smlaier if (aw->type != PF_ADDR_TABLE) 1161126258Smlaier return (0); 1162126258Smlaier if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1163126258Smlaier return (1); 1164126258Smlaier return (0); 1165126258Smlaier} 1166126258Smlaier 1167126258Smlaiervoid 1168126258Smlaierpf_tbladdr_remove(struct pf_addr_wrap *aw) 1169126258Smlaier{ 1170126258Smlaier if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1171126258Smlaier return; 1172126258Smlaier pfr_detach_table(aw->p.tbl); 1173126258Smlaier aw->p.tbl = NULL; 1174126258Smlaier} 1175126258Smlaier 1176126258Smlaiervoid 1177126258Smlaierpf_tbladdr_copyout(struct pf_addr_wrap *aw) 1178126258Smlaier{ 1179126258Smlaier struct pfr_ktable *kt = aw->p.tbl; 1180126258Smlaier 1181126258Smlaier if (aw->type != PF_ADDR_TABLE || kt == NULL) 1182126258Smlaier return; 1183126258Smlaier if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1184126258Smlaier kt = kt->pfrkt_root; 1185126258Smlaier aw->p.tbl = NULL; 1186126258Smlaier aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1187126258Smlaier kt->pfrkt_cnt : -1; 1188126258Smlaier} 1189126258Smlaier 1190126258Smlaiervoid 1191126258Smlaierpf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1192126258Smlaier{ 1193126258Smlaier switch (af) { 1194126258Smlaier#ifdef INET 1195126258Smlaier case AF_INET: { 1196126258Smlaier u_int32_t a = ntohl(addr->addr32[0]); 1197126258Smlaier printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1198126258Smlaier (a>>8)&255, a&255); 1199126258Smlaier if (p) { 1200126258Smlaier p = ntohs(p); 1201126258Smlaier printf(":%u", p); 1202126258Smlaier } 1203126258Smlaier break; 1204126258Smlaier } 1205126258Smlaier#endif /* INET */ 1206126258Smlaier#ifdef INET6 1207126258Smlaier case AF_INET6: { 1208126258Smlaier u_int16_t b; 1209126258Smlaier u_int8_t i, curstart = 255, curend = 0, 1210126258Smlaier maxstart = 0, maxend = 0; 1211126258Smlaier for (i = 0; i < 8; i++) { 1212126258Smlaier if (!addr->addr16[i]) { 1213126258Smlaier if (curstart == 255) 1214126258Smlaier curstart = i; 1215126258Smlaier else 1216126258Smlaier curend = i; 1217126258Smlaier } else { 1218126258Smlaier if (curstart) { 1219126258Smlaier if ((curend - curstart) > 1220126258Smlaier (maxend - maxstart)) { 1221126258Smlaier maxstart = curstart; 1222126258Smlaier maxend = curend; 1223126258Smlaier curstart = 255; 1224126258Smlaier } 1225126258Smlaier } 1226126258Smlaier } 1227126258Smlaier } 1228126258Smlaier for (i = 0; i < 8; i++) { 1229126258Smlaier if (i >= maxstart && i <= maxend) { 1230126258Smlaier if (maxend != 7) { 1231126258Smlaier if (i == maxstart) 1232126258Smlaier printf(":"); 1233126258Smlaier } else { 1234126258Smlaier if (i == maxend) 1235126258Smlaier printf(":"); 1236126258Smlaier } 1237126258Smlaier } else { 1238126258Smlaier b = ntohs(addr->addr16[i]); 1239126258Smlaier printf("%x", b); 1240126258Smlaier if (i < 7) 1241126258Smlaier printf(":"); 1242126258Smlaier } 1243126258Smlaier } 1244126258Smlaier if (p) { 1245126258Smlaier p = ntohs(p); 1246126258Smlaier printf("[%u]", p); 1247126258Smlaier } 1248126258Smlaier break; 1249126258Smlaier } 1250126258Smlaier#endif /* INET6 */ 1251126258Smlaier } 1252126258Smlaier} 1253126258Smlaier 1254126258Smlaiervoid 1255126258Smlaierpf_print_state(struct pf_state *s) 1256126258Smlaier{ 1257126258Smlaier switch (s->proto) { 1258126258Smlaier case IPPROTO_TCP: 1259126258Smlaier printf("TCP "); 1260126258Smlaier break; 1261126258Smlaier case IPPROTO_UDP: 1262126258Smlaier printf("UDP "); 1263126258Smlaier break; 1264126258Smlaier case IPPROTO_ICMP: 1265126258Smlaier printf("ICMP "); 1266126258Smlaier break; 1267126258Smlaier case IPPROTO_ICMPV6: 1268126258Smlaier printf("ICMPV6 "); 1269126258Smlaier break; 1270126258Smlaier default: 1271126258Smlaier printf("%u ", s->proto); 1272126258Smlaier break; 1273126258Smlaier } 1274126258Smlaier pf_print_host(&s->lan.addr, s->lan.port, s->af); 1275126258Smlaier printf(" "); 1276126258Smlaier pf_print_host(&s->gwy.addr, s->gwy.port, s->af); 1277126258Smlaier printf(" "); 1278126258Smlaier pf_print_host(&s->ext.addr, s->ext.port, s->af); 1279126258Smlaier printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1280126258Smlaier s->src.seqhi, s->src.max_win, s->src.seqdiff); 1281126258Smlaier if (s->src.wscale && s->dst.wscale) 1282126258Smlaier printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1283126258Smlaier printf("]"); 1284126258Smlaier printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1285126258Smlaier s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1286126258Smlaier if (s->src.wscale && s->dst.wscale) 1287126258Smlaier printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1288126258Smlaier printf("]"); 1289126258Smlaier printf(" %u:%u", s->src.state, s->dst.state); 1290126258Smlaier} 1291126258Smlaier 1292126258Smlaiervoid 1293126258Smlaierpf_print_flags(u_int8_t f) 1294126258Smlaier{ 1295126258Smlaier if (f) 1296126258Smlaier printf(" "); 1297126258Smlaier if (f & TH_FIN) 1298126258Smlaier printf("F"); 1299126258Smlaier if (f & TH_SYN) 1300126258Smlaier printf("S"); 1301126258Smlaier if (f & TH_RST) 1302126258Smlaier printf("R"); 1303126258Smlaier if (f & TH_PUSH) 1304126258Smlaier printf("P"); 1305126258Smlaier if (f & TH_ACK) 1306126258Smlaier printf("A"); 1307126258Smlaier if (f & TH_URG) 1308126258Smlaier printf("U"); 1309126258Smlaier if (f & TH_ECE) 1310126258Smlaier printf("E"); 1311126258Smlaier if (f & TH_CWR) 1312126258Smlaier printf("W"); 1313126258Smlaier} 1314126258Smlaier 1315126258Smlaier#define PF_SET_SKIP_STEPS(i) \ 1316126258Smlaier do { \ 1317126258Smlaier while (head[i] != cur) { \ 1318126258Smlaier head[i]->skip[i].ptr = cur; \ 1319126258Smlaier head[i] = TAILQ_NEXT(head[i], entries); \ 1320126258Smlaier } \ 1321126258Smlaier } while (0) 1322126258Smlaier 1323126258Smlaiervoid 1324126258Smlaierpf_calc_skip_steps(struct pf_rulequeue *rules) 1325126258Smlaier{ 1326126258Smlaier struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1327126258Smlaier int i; 1328126258Smlaier 1329126258Smlaier cur = TAILQ_FIRST(rules); 1330126258Smlaier prev = cur; 1331126258Smlaier for (i = 0; i < PF_SKIP_COUNT; ++i) 1332126258Smlaier head[i] = cur; 1333126258Smlaier while (cur != NULL) { 1334126258Smlaier 1335130613Smlaier if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1336126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1337126258Smlaier if (cur->direction != prev->direction) 1338126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1339126258Smlaier if (cur->af != prev->af) 1340126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_AF); 1341126258Smlaier if (cur->proto != prev->proto) 1342126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1343145836Smlaier if (cur->src.neg != prev->src.neg || 1344126258Smlaier pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1345126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1346126258Smlaier if (cur->src.port[0] != prev->src.port[0] || 1347126258Smlaier cur->src.port[1] != prev->src.port[1] || 1348126258Smlaier cur->src.port_op != prev->src.port_op) 1349126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1350145836Smlaier if (cur->dst.neg != prev->dst.neg || 1351126258Smlaier pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1352126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1353126258Smlaier if (cur->dst.port[0] != prev->dst.port[0] || 1354126258Smlaier cur->dst.port[1] != prev->dst.port[1] || 1355126258Smlaier cur->dst.port_op != prev->dst.port_op) 1356126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1357126258Smlaier 1358126258Smlaier prev = cur; 1359126258Smlaier cur = TAILQ_NEXT(cur, entries); 1360126258Smlaier } 1361126258Smlaier for (i = 0; i < PF_SKIP_COUNT; ++i) 1362126258Smlaier PF_SET_SKIP_STEPS(i); 1363126258Smlaier} 1364126258Smlaier 1365126258Smlaierint 1366126258Smlaierpf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1367126258Smlaier{ 1368126258Smlaier if (aw1->type != aw2->type) 1369126258Smlaier return (1); 1370126258Smlaier switch (aw1->type) { 1371126258Smlaier case PF_ADDR_ADDRMASK: 1372126258Smlaier if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1373126258Smlaier return (1); 1374126258Smlaier if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1375126258Smlaier return (1); 1376126258Smlaier return (0); 1377126258Smlaier case PF_ADDR_DYNIFTL: 1378130613Smlaier return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1379126258Smlaier case PF_ADDR_NOROUTE: 1380126258Smlaier return (0); 1381126258Smlaier case PF_ADDR_TABLE: 1382126258Smlaier return (aw1->p.tbl != aw2->p.tbl); 1383126258Smlaier default: 1384126258Smlaier printf("invalid address type: %d\n", aw1->type); 1385126258Smlaier return (1); 1386126258Smlaier } 1387126258Smlaier} 1388126258Smlaier 1389126258Smlaieru_int16_t 1390126258Smlaierpf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1391126258Smlaier{ 1392126258Smlaier u_int32_t l; 1393126258Smlaier 1394126258Smlaier if (udp && !cksum) 1395126258Smlaier return (0x0000); 1396126258Smlaier l = cksum + old - new; 1397126258Smlaier l = (l >> 16) + (l & 65535); 1398126258Smlaier l = l & 65535; 1399126258Smlaier if (udp && !l) 1400126258Smlaier return (0xFFFF); 1401126258Smlaier return (l); 1402126258Smlaier} 1403126258Smlaier 1404126258Smlaiervoid 1405126258Smlaierpf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1406126258Smlaier struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1407126258Smlaier{ 1408126258Smlaier struct pf_addr ao; 1409126258Smlaier u_int16_t po = *p; 1410126258Smlaier 1411126258Smlaier PF_ACPY(&ao, a, af); 1412126258Smlaier PF_ACPY(a, an, af); 1413126258Smlaier 1414126258Smlaier *p = pn; 1415126258Smlaier 1416126258Smlaier switch (af) { 1417126258Smlaier#ifdef INET 1418126258Smlaier case AF_INET: 1419126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1420126258Smlaier ao.addr16[0], an->addr16[0], 0), 1421126258Smlaier ao.addr16[1], an->addr16[1], 0); 1422126258Smlaier *p = pn; 1423126258Smlaier *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1424126258Smlaier ao.addr16[0], an->addr16[0], u), 1425126258Smlaier ao.addr16[1], an->addr16[1], u), 1426126258Smlaier po, pn, u); 1427126258Smlaier break; 1428126258Smlaier#endif /* INET */ 1429126258Smlaier#ifdef INET6 1430126258Smlaier case AF_INET6: 1431126258Smlaier *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1432126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1433126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1434126258Smlaier ao.addr16[0], an->addr16[0], u), 1435126258Smlaier ao.addr16[1], an->addr16[1], u), 1436126258Smlaier ao.addr16[2], an->addr16[2], u), 1437126258Smlaier ao.addr16[3], an->addr16[3], u), 1438126258Smlaier ao.addr16[4], an->addr16[4], u), 1439126258Smlaier ao.addr16[5], an->addr16[5], u), 1440126258Smlaier ao.addr16[6], an->addr16[6], u), 1441126258Smlaier ao.addr16[7], an->addr16[7], u), 1442126258Smlaier po, pn, u); 1443126258Smlaier break; 1444126258Smlaier#endif /* INET6 */ 1445126258Smlaier } 1446126258Smlaier} 1447126258Smlaier 1448126258Smlaier 1449126258Smlaier/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1450126258Smlaiervoid 1451126258Smlaierpf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1452126258Smlaier{ 1453126258Smlaier u_int32_t ao; 1454126258Smlaier 1455126258Smlaier memcpy(&ao, a, sizeof(ao)); 1456126258Smlaier memcpy(a, &an, sizeof(u_int32_t)); 1457126258Smlaier *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1458126258Smlaier ao % 65536, an % 65536, u); 1459126258Smlaier} 1460126258Smlaier 1461126258Smlaier#ifdef INET6 1462126258Smlaiervoid 1463126258Smlaierpf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1464126258Smlaier{ 1465126258Smlaier struct pf_addr ao; 1466126258Smlaier 1467126258Smlaier PF_ACPY(&ao, a, AF_INET6); 1468126258Smlaier PF_ACPY(a, an, AF_INET6); 1469126258Smlaier 1470126258Smlaier *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1471126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1472126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*c, 1473126258Smlaier ao.addr16[0], an->addr16[0], u), 1474126258Smlaier ao.addr16[1], an->addr16[1], u), 1475126258Smlaier ao.addr16[2], an->addr16[2], u), 1476126258Smlaier ao.addr16[3], an->addr16[3], u), 1477126258Smlaier ao.addr16[4], an->addr16[4], u), 1478126258Smlaier ao.addr16[5], an->addr16[5], u), 1479126258Smlaier ao.addr16[6], an->addr16[6], u), 1480126258Smlaier ao.addr16[7], an->addr16[7], u); 1481126258Smlaier} 1482126258Smlaier#endif /* INET6 */ 1483126258Smlaier 1484126258Smlaiervoid 1485126258Smlaierpf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1486126258Smlaier struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1487126258Smlaier u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1488126258Smlaier{ 1489126258Smlaier struct pf_addr oia, ooa; 1490126258Smlaier 1491126258Smlaier PF_ACPY(&oia, ia, af); 1492126258Smlaier PF_ACPY(&ooa, oa, af); 1493126258Smlaier 1494126258Smlaier /* Change inner protocol port, fix inner protocol checksum. */ 1495126258Smlaier if (ip != NULL) { 1496126258Smlaier u_int16_t oip = *ip; 1497127629Smlaier u_int32_t opc = 0; /* make the compiler happy */ 1498126258Smlaier 1499126258Smlaier if (pc != NULL) 1500126258Smlaier opc = *pc; 1501126258Smlaier *ip = np; 1502126258Smlaier if (pc != NULL) 1503126258Smlaier *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1504126258Smlaier *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1505126258Smlaier if (pc != NULL) 1506126258Smlaier *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1507126258Smlaier } 1508126258Smlaier /* Change inner ip address, fix inner ip and icmp checksums. */ 1509126258Smlaier PF_ACPY(ia, na, af); 1510126258Smlaier switch (af) { 1511126258Smlaier#ifdef INET 1512126258Smlaier case AF_INET: { 1513126258Smlaier u_int32_t oh2c = *h2c; 1514126258Smlaier 1515126258Smlaier *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1516126258Smlaier oia.addr16[0], ia->addr16[0], 0), 1517126258Smlaier oia.addr16[1], ia->addr16[1], 0); 1518126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1519126258Smlaier oia.addr16[0], ia->addr16[0], 0), 1520126258Smlaier oia.addr16[1], ia->addr16[1], 0); 1521126258Smlaier *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1522126258Smlaier break; 1523126258Smlaier } 1524126258Smlaier#endif /* INET */ 1525126258Smlaier#ifdef INET6 1526126258Smlaier case AF_INET6: 1527126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1528126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1529126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*ic, 1530126258Smlaier oia.addr16[0], ia->addr16[0], u), 1531126258Smlaier oia.addr16[1], ia->addr16[1], u), 1532126258Smlaier oia.addr16[2], ia->addr16[2], u), 1533126258Smlaier oia.addr16[3], ia->addr16[3], u), 1534126258Smlaier oia.addr16[4], ia->addr16[4], u), 1535126258Smlaier oia.addr16[5], ia->addr16[5], u), 1536126258Smlaier oia.addr16[6], ia->addr16[6], u), 1537126258Smlaier oia.addr16[7], ia->addr16[7], u); 1538126258Smlaier break; 1539126258Smlaier#endif /* INET6 */ 1540126258Smlaier } 1541126258Smlaier /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1542126258Smlaier PF_ACPY(oa, na, af); 1543126258Smlaier switch (af) { 1544126258Smlaier#ifdef INET 1545126258Smlaier case AF_INET: 1546126258Smlaier *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1547126258Smlaier ooa.addr16[0], oa->addr16[0], 0), 1548126258Smlaier ooa.addr16[1], oa->addr16[1], 0); 1549126258Smlaier break; 1550126258Smlaier#endif /* INET */ 1551126258Smlaier#ifdef INET6 1552126258Smlaier case AF_INET6: 1553126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1554126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1555126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*ic, 1556126258Smlaier ooa.addr16[0], oa->addr16[0], u), 1557126258Smlaier ooa.addr16[1], oa->addr16[1], u), 1558126258Smlaier ooa.addr16[2], oa->addr16[2], u), 1559126258Smlaier ooa.addr16[3], oa->addr16[3], u), 1560126258Smlaier ooa.addr16[4], oa->addr16[4], u), 1561126258Smlaier ooa.addr16[5], oa->addr16[5], u), 1562126258Smlaier ooa.addr16[6], oa->addr16[6], u), 1563126258Smlaier ooa.addr16[7], oa->addr16[7], u); 1564126258Smlaier break; 1565126258Smlaier#endif /* INET6 */ 1566126258Smlaier } 1567126258Smlaier} 1568126258Smlaier 1569126258Smlaiervoid 1570126258Smlaierpf_send_tcp(const struct pf_rule *r, sa_family_t af, 1571126258Smlaier const struct pf_addr *saddr, const struct pf_addr *daddr, 1572126258Smlaier u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1573145836Smlaier u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1574145836Smlaier struct ether_header *eh, struct ifnet *ifp) 1575126258Smlaier{ 1576126258Smlaier struct mbuf *m; 1577127629Smlaier int len = 0, tlen; /* make the compiler happy */ 1578126258Smlaier#ifdef INET 1579127629Smlaier struct ip *h = NULL; /* make the compiler happy */ 1580126258Smlaier#endif /* INET */ 1581126258Smlaier#ifdef INET6 1582127629Smlaier struct ip6_hdr *h6 = NULL; /* make the compiler happy */ 1583126258Smlaier#endif /* INET6 */ 1584127629Smlaier struct tcphdr *th = NULL; /* make the compiler happy */ 1585126258Smlaier char *opt; 1586126258Smlaier 1587126258Smlaier /* maximum segment size tcp option */ 1588126258Smlaier tlen = sizeof(struct tcphdr); 1589126258Smlaier if (mss) 1590126258Smlaier tlen += 4; 1591126258Smlaier 1592126258Smlaier switch (af) { 1593126258Smlaier#ifdef INET 1594126258Smlaier case AF_INET: 1595126258Smlaier len = sizeof(struct ip) + tlen; 1596126258Smlaier break; 1597126258Smlaier#endif /* INET */ 1598126258Smlaier#ifdef INET6 1599126258Smlaier case AF_INET6: 1600126258Smlaier len = sizeof(struct ip6_hdr) + tlen; 1601126258Smlaier break; 1602126258Smlaier#endif /* INET6 */ 1603126258Smlaier } 1604126258Smlaier 1605126258Smlaier /* create outgoing mbuf */ 1606132280Smlaier m = m_gethdr(M_DONTWAIT, MT_HEADER); 1607132280Smlaier if (m == NULL) 1608132280Smlaier return; 1609145836Smlaier if (tag) { 1610145836Smlaier#ifdef __FreeBSD__ 1611145836Smlaier m->m_flags |= M_SKIP_FIREWALL; 1612132280Smlaier#else 1613145836Smlaier struct m_tag *mtag; 1614145836Smlaier 1615145836Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 1616145836Smlaier if (mtag == NULL) { 1617145836Smlaier m_freem(m); 1618145836Smlaier return; 1619145836Smlaier } 1620145836Smlaier m_tag_prepend(m, mtag); 1621145836Smlaier#endif 1622126258Smlaier } 1623126258Smlaier#ifdef ALTQ 1624126258Smlaier if (r != NULL && r->qid) { 1625145836Smlaier struct m_tag *mtag; 1626126258Smlaier struct altq_tag *atag; 1627126258Smlaier 1628126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 1629126258Smlaier if (mtag != NULL) { 1630126258Smlaier atag = (struct altq_tag *)(mtag + 1); 1631126258Smlaier atag->qid = r->qid; 1632126258Smlaier /* add hints for ecn */ 1633126258Smlaier atag->af = af; 1634126258Smlaier atag->hdr = mtod(m, struct ip *); 1635126258Smlaier m_tag_prepend(m, mtag); 1636126258Smlaier } 1637126258Smlaier } 1638145836Smlaier#endif /* ALTQ */ 1639126258Smlaier m->m_data += max_linkhdr; 1640126258Smlaier m->m_pkthdr.len = m->m_len = len; 1641126258Smlaier m->m_pkthdr.rcvif = NULL; 1642126258Smlaier bzero(m->m_data, len); 1643126258Smlaier switch (af) { 1644126258Smlaier#ifdef INET 1645126258Smlaier case AF_INET: 1646126258Smlaier h = mtod(m, struct ip *); 1647126258Smlaier 1648126258Smlaier /* IP header fields included in the TCP checksum */ 1649126258Smlaier h->ip_p = IPPROTO_TCP; 1650126258Smlaier h->ip_len = htons(tlen); 1651126258Smlaier h->ip_src.s_addr = saddr->v4.s_addr; 1652126258Smlaier h->ip_dst.s_addr = daddr->v4.s_addr; 1653126258Smlaier 1654126258Smlaier th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1655126258Smlaier break; 1656126258Smlaier#endif /* INET */ 1657126258Smlaier#ifdef INET6 1658126258Smlaier case AF_INET6: 1659126258Smlaier h6 = mtod(m, struct ip6_hdr *); 1660126258Smlaier 1661126258Smlaier /* IP header fields included in the TCP checksum */ 1662126258Smlaier h6->ip6_nxt = IPPROTO_TCP; 1663126258Smlaier h6->ip6_plen = htons(tlen); 1664126258Smlaier memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1665126258Smlaier memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1666126258Smlaier 1667126258Smlaier th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1668126258Smlaier break; 1669126258Smlaier#endif /* INET6 */ 1670126258Smlaier } 1671126258Smlaier 1672126258Smlaier /* TCP header */ 1673126258Smlaier th->th_sport = sport; 1674126258Smlaier th->th_dport = dport; 1675126258Smlaier th->th_seq = htonl(seq); 1676126258Smlaier th->th_ack = htonl(ack); 1677126258Smlaier th->th_off = tlen >> 2; 1678126258Smlaier th->th_flags = flags; 1679126258Smlaier th->th_win = htons(win); 1680126258Smlaier 1681126258Smlaier if (mss) { 1682126258Smlaier opt = (char *)(th + 1); 1683126258Smlaier opt[0] = TCPOPT_MAXSEG; 1684126258Smlaier opt[1] = 4; 1685126258Smlaier HTONS(mss); 1686126258Smlaier bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1687126258Smlaier } 1688126258Smlaier 1689126258Smlaier switch (af) { 1690126258Smlaier#ifdef INET 1691126258Smlaier case AF_INET: 1692126258Smlaier /* TCP checksum */ 1693126258Smlaier th->th_sum = in_cksum(m, len); 1694126258Smlaier 1695126258Smlaier /* Finish the IP header */ 1696126258Smlaier h->ip_v = 4; 1697126258Smlaier h->ip_hl = sizeof(*h) >> 2; 1698126258Smlaier h->ip_tos = IPTOS_LOWDELAY; 1699127145Smlaier#ifdef __FreeBSD__ 1700130613Smlaier h->ip_off = path_mtu_discovery ? IP_DF : 0; 1701130613Smlaier h->ip_len = len; 1702126261Smlaier#else 1703126261Smlaier h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1704130613Smlaier h->ip_len = htons(len); 1705126261Smlaier#endif 1706126258Smlaier h->ip_ttl = ttl ? ttl : ip_defttl; 1707126258Smlaier h->ip_sum = 0; 1708145836Smlaier if (eh == NULL) { 1709127145Smlaier#ifdef __FreeBSD__ 1710145836Smlaier PF_UNLOCK(); 1711145836Smlaier ip_output(m, (void *)NULL, (void *)NULL, 0, 1712145836Smlaier (void *)NULL, (void *)NULL); 1713145836Smlaier PF_LOCK(); 1714126261Smlaier#else /* ! __FreeBSD__ */ 1715145836Smlaier ip_output(m, (void *)NULL, (void *)NULL, 0, 1716145836Smlaier (void *)NULL, (void *)NULL); 1717126261Smlaier#endif 1718145836Smlaier } else { 1719145836Smlaier struct route ro; 1720145836Smlaier struct rtentry rt; 1721145836Smlaier struct ether_header *e = (void *)ro.ro_dst.sa_data; 1722145836Smlaier 1723145836Smlaier if (ifp == NULL) { 1724145836Smlaier m_freem(m); 1725145836Smlaier return; 1726145836Smlaier } 1727145836Smlaier rt.rt_ifp = ifp; 1728145836Smlaier ro.ro_rt = &rt; 1729145836Smlaier ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1730145836Smlaier ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1731145836Smlaier bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1732145836Smlaier bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1733145836Smlaier e->ether_type = eh->ether_type; 1734145836Smlaier#ifdef __FreeBSD__ 1735145836Smlaier PF_UNLOCK(); 1736145836Smlaier /* XXX_IMPORT: later */ 1737145836Smlaier ip_output(m, (void *)NULL, &ro, 0, 1738145836Smlaier (void *)NULL, (void *)NULL); 1739145836Smlaier PF_LOCK(); 1740145836Smlaier#else /* ! __FreeBSD__ */ 1741145836Smlaier ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 1742145836Smlaier (void *)NULL, (void *)NULL); 1743145836Smlaier#endif 1744145836Smlaier } 1745126258Smlaier break; 1746126258Smlaier#endif /* INET */ 1747126258Smlaier#ifdef INET6 1748126258Smlaier case AF_INET6: 1749126258Smlaier /* TCP checksum */ 1750126258Smlaier th->th_sum = in6_cksum(m, IPPROTO_TCP, 1751126258Smlaier sizeof(struct ip6_hdr), tlen); 1752126258Smlaier 1753126258Smlaier h6->ip6_vfc |= IPV6_VERSION; 1754126258Smlaier h6->ip6_hlim = IPV6_DEFHLIM; 1755126258Smlaier 1756127145Smlaier#ifdef __FreeBSD__ 1757126261Smlaier PF_UNLOCK(); 1758126261Smlaier ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1759126261Smlaier PF_LOCK(); 1760126261Smlaier#else 1761126258Smlaier ip6_output(m, NULL, NULL, 0, NULL, NULL); 1762126261Smlaier#endif 1763126258Smlaier break; 1764126258Smlaier#endif /* INET6 */ 1765126258Smlaier } 1766126258Smlaier} 1767126258Smlaier 1768126258Smlaiervoid 1769126258Smlaierpf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1770126258Smlaier struct pf_rule *r) 1771126258Smlaier{ 1772132280Smlaier#ifdef ALTQ 1773126258Smlaier struct m_tag *mtag; 1774132280Smlaier#endif 1775126258Smlaier struct mbuf *m0; 1776127145Smlaier#ifdef __FreeBSD__ 1777126261Smlaier struct ip *ip; 1778126261Smlaier#endif 1779126258Smlaier 1780132280Smlaier#ifdef __FreeBSD__ 1781132280Smlaier m0 = m_copypacket(m, M_DONTWAIT); 1782132280Smlaier if (m0 == NULL) 1783132280Smlaier return; 1784132280Smlaier m0->m_flags |= M_SKIP_FIREWALL; 1785132280Smlaier#else 1786126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 1787126258Smlaier if (mtag == NULL) 1788126258Smlaier return; 1789126258Smlaier m0 = m_copy(m, 0, M_COPYALL); 1790126258Smlaier if (m0 == NULL) { 1791126258Smlaier m_tag_free(mtag); 1792126258Smlaier return; 1793126258Smlaier } 1794126258Smlaier m_tag_prepend(m0, mtag); 1795132280Smlaier#endif 1796126258Smlaier 1797126258Smlaier#ifdef ALTQ 1798126258Smlaier if (r->qid) { 1799126258Smlaier struct altq_tag *atag; 1800126258Smlaier 1801126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 1802126258Smlaier if (mtag != NULL) { 1803126258Smlaier atag = (struct altq_tag *)(mtag + 1); 1804126258Smlaier atag->qid = r->qid; 1805126258Smlaier /* add hints for ecn */ 1806126258Smlaier atag->af = af; 1807126258Smlaier atag->hdr = mtod(m0, struct ip *); 1808126258Smlaier m_tag_prepend(m0, mtag); 1809126258Smlaier } 1810126258Smlaier } 1811145836Smlaier#endif /* ALTQ */ 1812126258Smlaier 1813126258Smlaier switch (af) { 1814126258Smlaier#ifdef INET 1815126258Smlaier case AF_INET: 1816127145Smlaier#ifdef __FreeBSD__ 1817126261Smlaier /* icmp_error() expects host byte ordering */ 1818126261Smlaier ip = mtod(m0, struct ip *); 1819126261Smlaier NTOHS(ip->ip_len); 1820126261Smlaier NTOHS(ip->ip_off); 1821126261Smlaier PF_UNLOCK(); 1822145863Sandre icmp_error(m0, type, code, 0, 0); 1823126261Smlaier PF_LOCK(); 1824145874Smlaier#else 1825145874Smlaier icmp_error(m0, type, code, 0, (void *)NULL); 1826126261Smlaier#endif 1827126258Smlaier break; 1828126258Smlaier#endif /* INET */ 1829126258Smlaier#ifdef INET6 1830126258Smlaier case AF_INET6: 1831127145Smlaier#ifdef __FreeBSD__ 1832126261Smlaier PF_UNLOCK(); 1833126261Smlaier#endif 1834126258Smlaier icmp6_error(m0, type, code, 0); 1835127145Smlaier#ifdef __FreeBSD__ 1836126261Smlaier PF_LOCK(); 1837126261Smlaier#endif 1838126258Smlaier break; 1839126258Smlaier#endif /* INET6 */ 1840126258Smlaier } 1841126258Smlaier} 1842126258Smlaier 1843126258Smlaier/* 1844126258Smlaier * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1845126258Smlaier * If n is 0, they match if they are equal. If n is != 0, they match if they 1846126258Smlaier * are different. 1847126258Smlaier */ 1848126258Smlaierint 1849126258Smlaierpf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1850126258Smlaier struct pf_addr *b, sa_family_t af) 1851126258Smlaier{ 1852126258Smlaier int match = 0; 1853126258Smlaier 1854126258Smlaier switch (af) { 1855126258Smlaier#ifdef INET 1856126258Smlaier case AF_INET: 1857126258Smlaier if ((a->addr32[0] & m->addr32[0]) == 1858126258Smlaier (b->addr32[0] & m->addr32[0])) 1859126258Smlaier match++; 1860126258Smlaier break; 1861126258Smlaier#endif /* INET */ 1862126258Smlaier#ifdef INET6 1863126258Smlaier case AF_INET6: 1864126258Smlaier if (((a->addr32[0] & m->addr32[0]) == 1865126258Smlaier (b->addr32[0] & m->addr32[0])) && 1866126258Smlaier ((a->addr32[1] & m->addr32[1]) == 1867126258Smlaier (b->addr32[1] & m->addr32[1])) && 1868126258Smlaier ((a->addr32[2] & m->addr32[2]) == 1869126258Smlaier (b->addr32[2] & m->addr32[2])) && 1870126258Smlaier ((a->addr32[3] & m->addr32[3]) == 1871126258Smlaier (b->addr32[3] & m->addr32[3]))) 1872126258Smlaier match++; 1873126258Smlaier break; 1874126258Smlaier#endif /* INET6 */ 1875126258Smlaier } 1876126258Smlaier if (match) { 1877126258Smlaier if (n) 1878126258Smlaier return (0); 1879126258Smlaier else 1880126258Smlaier return (1); 1881126258Smlaier } else { 1882126258Smlaier if (n) 1883126258Smlaier return (1); 1884126258Smlaier else 1885126258Smlaier return (0); 1886126258Smlaier } 1887126258Smlaier} 1888126258Smlaier 1889126258Smlaierint 1890126258Smlaierpf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1891126258Smlaier{ 1892126258Smlaier switch (op) { 1893126258Smlaier case PF_OP_IRG: 1894126258Smlaier return ((p > a1) && (p < a2)); 1895126258Smlaier case PF_OP_XRG: 1896126258Smlaier return ((p < a1) || (p > a2)); 1897126258Smlaier case PF_OP_RRG: 1898126258Smlaier return ((p >= a1) && (p <= a2)); 1899126258Smlaier case PF_OP_EQ: 1900126258Smlaier return (p == a1); 1901126258Smlaier case PF_OP_NE: 1902126258Smlaier return (p != a1); 1903126258Smlaier case PF_OP_LT: 1904126258Smlaier return (p < a1); 1905126258Smlaier case PF_OP_LE: 1906126258Smlaier return (p <= a1); 1907126258Smlaier case PF_OP_GT: 1908126258Smlaier return (p > a1); 1909126258Smlaier case PF_OP_GE: 1910126258Smlaier return (p >= a1); 1911126258Smlaier } 1912126258Smlaier return (0); /* never reached */ 1913126258Smlaier} 1914126258Smlaier 1915126258Smlaierint 1916126258Smlaierpf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1917126258Smlaier{ 1918126258Smlaier NTOHS(a1); 1919126258Smlaier NTOHS(a2); 1920126258Smlaier NTOHS(p); 1921126258Smlaier return (pf_match(op, a1, a2, p)); 1922126258Smlaier} 1923126258Smlaier 1924126258Smlaierint 1925126258Smlaierpf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1926126258Smlaier{ 1927126258Smlaier if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1928126258Smlaier return (0); 1929126258Smlaier return (pf_match(op, a1, a2, u)); 1930126258Smlaier} 1931126258Smlaier 1932126258Smlaierint 1933126258Smlaierpf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 1934126258Smlaier{ 1935126258Smlaier if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1936126258Smlaier return (0); 1937126258Smlaier return (pf_match(op, a1, a2, g)); 1938126258Smlaier} 1939126258Smlaier 1940126258Smlaierstruct pf_tag * 1941126258Smlaierpf_get_tag(struct mbuf *m) 1942126258Smlaier{ 1943126258Smlaier struct m_tag *mtag; 1944126258Smlaier 1945126258Smlaier if ((mtag = m_tag_find(m, PACKET_TAG_PF_TAG, NULL)) != NULL) 1946126258Smlaier return ((struct pf_tag *)(mtag + 1)); 1947126258Smlaier else 1948126258Smlaier return (NULL); 1949126258Smlaier} 1950126258Smlaier 1951126258Smlaierint 1952145836Smlaierpf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_tag **pftag, int *tag) 1953126258Smlaier{ 1954126258Smlaier if (*tag == -1) { /* find mbuf tag */ 1955145836Smlaier *pftag = pf_get_tag(m); 1956145836Smlaier if (*pftag != NULL) 1957145836Smlaier *tag = (*pftag)->tag; 1958126258Smlaier else 1959126258Smlaier *tag = 0; 1960126258Smlaier } 1961126258Smlaier 1962126258Smlaier return ((!r->match_tag_not && r->match_tag == *tag) || 1963126258Smlaier (r->match_tag_not && r->match_tag != *tag)); 1964126258Smlaier} 1965126258Smlaier 1966126258Smlaierint 1967126258Smlaierpf_tag_packet(struct mbuf *m, struct pf_tag *pftag, int tag) 1968126258Smlaier{ 1969126258Smlaier struct m_tag *mtag; 1970126258Smlaier 1971126258Smlaier if (tag <= 0) 1972126258Smlaier return (0); 1973126258Smlaier 1974126258Smlaier if (pftag == NULL) { 1975126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_TAG, sizeof(*pftag), M_NOWAIT); 1976126258Smlaier if (mtag == NULL) 1977126258Smlaier return (1); 1978126258Smlaier ((struct pf_tag *)(mtag + 1))->tag = tag; 1979126258Smlaier m_tag_prepend(m, mtag); 1980126258Smlaier } else 1981126258Smlaier pftag->tag = tag; 1982126258Smlaier 1983126258Smlaier return (0); 1984126258Smlaier} 1985126258Smlaier 1986145836Smlaierstatic void 1987145836Smlaierpf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 1988145836Smlaier struct pf_rule **r, struct pf_rule **a) 1989145836Smlaier{ 1990145836Smlaier struct pf_anchor_stackframe *f; 1991126258Smlaier 1992145836Smlaier if (*depth >= sizeof(pf_anchor_stack) / 1993145836Smlaier sizeof(pf_anchor_stack[0])) { 1994145836Smlaier printf("pf_step_into_anchor: stack overflow\n"); 1995145836Smlaier *r = TAILQ_NEXT(*r, entries); 1996145836Smlaier return; 1997145836Smlaier } else if (*depth == 0 && a != NULL) 1998145836Smlaier *a = *r; 1999145836Smlaier f = pf_anchor_stack + (*depth)++; 2000145836Smlaier f->rs = *rs; 2001145836Smlaier f->r = *r; 2002145836Smlaier if ((*r)->anchor_wildcard) { 2003145836Smlaier f->parent = &(*r)->anchor->children; 2004145836Smlaier if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2005145836Smlaier NULL) { 2006145836Smlaier *r = NULL; 2007145836Smlaier return; 2008145836Smlaier } 2009145836Smlaier *rs = &f->child->ruleset; 2010145836Smlaier } else { 2011145836Smlaier f->parent = NULL; 2012145836Smlaier f->child = NULL; 2013145836Smlaier *rs = &(*r)->anchor->ruleset; 2014145836Smlaier } 2015145836Smlaier *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2016145836Smlaier} 2017126258Smlaier 2018145836Smlaierstatic void 2019145836Smlaierpf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2020145836Smlaier struct pf_rule **r, struct pf_rule **a) 2021145836Smlaier{ 2022145836Smlaier struct pf_anchor_stackframe *f; 2023145836Smlaier 2024145836Smlaier do { 2025145836Smlaier if (*depth <= 0) 2026145836Smlaier break; 2027145836Smlaier f = pf_anchor_stack + *depth - 1; 2028145836Smlaier if (f->parent != NULL && f->child != NULL) { 2029145836Smlaier f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2030145836Smlaier if (f->child != NULL) { 2031145836Smlaier *rs = &f->child->ruleset; 2032145836Smlaier *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2033145836Smlaier if (*r == NULL) 2034145836Smlaier continue; 2035145836Smlaier else 2036145836Smlaier break; 2037145836Smlaier } 2038145836Smlaier } 2039145836Smlaier (*depth)--; 2040145836Smlaier if (*depth == 0 && a != NULL) 2041145836Smlaier *a = NULL; 2042145836Smlaier *rs = f->rs; 2043145836Smlaier *r = TAILQ_NEXT(f->r, entries); 2044145836Smlaier } while (*r == NULL); 2045145836Smlaier} 2046145836Smlaier 2047126258Smlaier#ifdef INET6 2048126258Smlaiervoid 2049126258Smlaierpf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2050126258Smlaier struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2051126258Smlaier{ 2052126258Smlaier switch (af) { 2053126258Smlaier#ifdef INET 2054126258Smlaier case AF_INET: 2055126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2056126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2057126258Smlaier break; 2058126258Smlaier#endif /* INET */ 2059126258Smlaier case AF_INET6: 2060126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2061126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2062126258Smlaier naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2063126258Smlaier ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2064126258Smlaier naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2065126258Smlaier ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2066126258Smlaier naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2067126258Smlaier ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2068126258Smlaier break; 2069126258Smlaier } 2070126258Smlaier} 2071126258Smlaier 2072126258Smlaiervoid 2073130613Smlaierpf_addr_inc(struct pf_addr *addr, sa_family_t af) 2074126258Smlaier{ 2075126258Smlaier switch (af) { 2076126258Smlaier#ifdef INET 2077126258Smlaier case AF_INET: 2078126258Smlaier addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2079126258Smlaier break; 2080126258Smlaier#endif /* INET */ 2081126258Smlaier case AF_INET6: 2082126258Smlaier if (addr->addr32[3] == 0xffffffff) { 2083126258Smlaier addr->addr32[3] = 0; 2084126258Smlaier if (addr->addr32[2] == 0xffffffff) { 2085126258Smlaier addr->addr32[2] = 0; 2086126258Smlaier if (addr->addr32[1] == 0xffffffff) { 2087126258Smlaier addr->addr32[1] = 0; 2088126258Smlaier addr->addr32[0] = 2089126258Smlaier htonl(ntohl(addr->addr32[0]) + 1); 2090126258Smlaier } else 2091126258Smlaier addr->addr32[1] = 2092126258Smlaier htonl(ntohl(addr->addr32[1]) + 1); 2093126258Smlaier } else 2094126258Smlaier addr->addr32[2] = 2095126258Smlaier htonl(ntohl(addr->addr32[2]) + 1); 2096126258Smlaier } else 2097126258Smlaier addr->addr32[3] = 2098126258Smlaier htonl(ntohl(addr->addr32[3]) + 1); 2099126258Smlaier break; 2100126258Smlaier } 2101126258Smlaier} 2102126258Smlaier#endif /* INET6 */ 2103126258Smlaier 2104126258Smlaier#define mix(a,b,c) \ 2105126258Smlaier do { \ 2106126258Smlaier a -= b; a -= c; a ^= (c >> 13); \ 2107126258Smlaier b -= c; b -= a; b ^= (a << 8); \ 2108126258Smlaier c -= a; c -= b; c ^= (b >> 13); \ 2109126258Smlaier a -= b; a -= c; a ^= (c >> 12); \ 2110126258Smlaier b -= c; b -= a; b ^= (a << 16); \ 2111126258Smlaier c -= a; c -= b; c ^= (b >> 5); \ 2112126258Smlaier a -= b; a -= c; a ^= (c >> 3); \ 2113126258Smlaier b -= c; b -= a; b ^= (a << 10); \ 2114126258Smlaier c -= a; c -= b; c ^= (b >> 15); \ 2115126258Smlaier } while (0) 2116126258Smlaier 2117126258Smlaier/* 2118126258Smlaier * hash function based on bridge_hash in if_bridge.c 2119126258Smlaier */ 2120126258Smlaiervoid 2121126258Smlaierpf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2122126258Smlaier struct pf_poolhashkey *key, sa_family_t af) 2123126258Smlaier{ 2124126258Smlaier u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2125126258Smlaier 2126126258Smlaier switch (af) { 2127126258Smlaier#ifdef INET 2128126258Smlaier case AF_INET: 2129126258Smlaier a += inaddr->addr32[0]; 2130126258Smlaier b += key->key32[1]; 2131126258Smlaier mix(a, b, c); 2132126258Smlaier hash->addr32[0] = c + key->key32[2]; 2133126258Smlaier break; 2134126258Smlaier#endif /* INET */ 2135126258Smlaier#ifdef INET6 2136126258Smlaier case AF_INET6: 2137126258Smlaier a += inaddr->addr32[0]; 2138126258Smlaier b += inaddr->addr32[2]; 2139126258Smlaier mix(a, b, c); 2140126258Smlaier hash->addr32[0] = c; 2141126258Smlaier a += inaddr->addr32[1]; 2142126258Smlaier b += inaddr->addr32[3]; 2143126258Smlaier c += key->key32[1]; 2144126258Smlaier mix(a, b, c); 2145126258Smlaier hash->addr32[1] = c; 2146126258Smlaier a += inaddr->addr32[2]; 2147126258Smlaier b += inaddr->addr32[1]; 2148126258Smlaier c += key->key32[2]; 2149126258Smlaier mix(a, b, c); 2150126258Smlaier hash->addr32[2] = c; 2151126258Smlaier a += inaddr->addr32[3]; 2152126258Smlaier b += inaddr->addr32[0]; 2153126258Smlaier c += key->key32[3]; 2154126258Smlaier mix(a, b, c); 2155126258Smlaier hash->addr32[3] = c; 2156126258Smlaier break; 2157126258Smlaier#endif /* INET6 */ 2158126258Smlaier } 2159126258Smlaier} 2160126258Smlaier 2161126258Smlaierint 2162130613Smlaierpf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2163130613Smlaier struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2164126258Smlaier{ 2165126258Smlaier unsigned char hash[16]; 2166130613Smlaier struct pf_pool *rpool = &r->rpool; 2167130613Smlaier struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2168130613Smlaier struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2169126258Smlaier struct pf_pooladdr *acur = rpool->cur; 2170130613Smlaier struct pf_src_node k; 2171126258Smlaier 2172130613Smlaier if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2173130613Smlaier (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2174130613Smlaier k.af = af; 2175130613Smlaier PF_ACPY(&k.addr, saddr, af); 2176130613Smlaier if (r->rule_flag & PFRULE_RULESRCTRACK || 2177130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) 2178130613Smlaier k.rule.ptr = r; 2179130613Smlaier else 2180130613Smlaier k.rule.ptr = NULL; 2181130613Smlaier pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2182130613Smlaier *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2183130613Smlaier if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2184130613Smlaier PF_ACPY(naddr, &(*sn)->raddr, af); 2185130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 2186130613Smlaier printf("pf_map_addr: src tracking maps "); 2187130613Smlaier pf_print_host(&k.addr, 0, af); 2188130613Smlaier printf(" to "); 2189130613Smlaier pf_print_host(naddr, 0, af); 2190130613Smlaier printf("\n"); 2191130613Smlaier } 2192130613Smlaier return (0); 2193130613Smlaier } 2194130613Smlaier } 2195130613Smlaier 2196126258Smlaier if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2197126258Smlaier return (1); 2198130613Smlaier if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2199145836Smlaier switch (af) { 2200145836Smlaier#ifdef INET 2201145836Smlaier case AF_INET: 2202130613Smlaier if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2203130613Smlaier (rpool->opts & PF_POOL_TYPEMASK) != 2204130613Smlaier PF_POOL_ROUNDROBIN) 2205130613Smlaier return (1); 2206130613Smlaier raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2207130613Smlaier rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2208145836Smlaier break; 2209145836Smlaier#endif /* INET */ 2210145836Smlaier#ifdef INET6 2211145836Smlaier case AF_INET6: 2212130613Smlaier if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2213130613Smlaier (rpool->opts & PF_POOL_TYPEMASK) != 2214130613Smlaier PF_POOL_ROUNDROBIN) 2215130613Smlaier return (1); 2216130613Smlaier raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2217130613Smlaier rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2218145836Smlaier break; 2219145836Smlaier#endif /* INET6 */ 2220130613Smlaier } 2221130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2222126258Smlaier if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2223126258Smlaier return (1); /* unsupported */ 2224126258Smlaier } else { 2225126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 2226126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 2227126258Smlaier } 2228126258Smlaier 2229126258Smlaier switch (rpool->opts & PF_POOL_TYPEMASK) { 2230126258Smlaier case PF_POOL_NONE: 2231126258Smlaier PF_ACPY(naddr, raddr, af); 2232126258Smlaier break; 2233126258Smlaier case PF_POOL_BITMASK: 2234126258Smlaier PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2235126258Smlaier break; 2236126258Smlaier case PF_POOL_RANDOM: 2237126258Smlaier if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2238126258Smlaier switch (af) { 2239126258Smlaier#ifdef INET 2240126258Smlaier case AF_INET: 2241145836Smlaier rpool->counter.addr32[0] = htonl(arc4random()); 2242126258Smlaier break; 2243126258Smlaier#endif /* INET */ 2244126258Smlaier#ifdef INET6 2245126258Smlaier case AF_INET6: 2246126258Smlaier if (rmask->addr32[3] != 0xffffffff) 2247145836Smlaier rpool->counter.addr32[3] = 2248145836Smlaier htonl(arc4random()); 2249126258Smlaier else 2250126258Smlaier break; 2251126258Smlaier if (rmask->addr32[2] != 0xffffffff) 2252145836Smlaier rpool->counter.addr32[2] = 2253145836Smlaier htonl(arc4random()); 2254126258Smlaier else 2255126258Smlaier break; 2256126258Smlaier if (rmask->addr32[1] != 0xffffffff) 2257145836Smlaier rpool->counter.addr32[1] = 2258145836Smlaier htonl(arc4random()); 2259126258Smlaier else 2260126258Smlaier break; 2261126258Smlaier if (rmask->addr32[0] != 0xffffffff) 2262145836Smlaier rpool->counter.addr32[0] = 2263145836Smlaier htonl(arc4random()); 2264126258Smlaier break; 2265126258Smlaier#endif /* INET6 */ 2266126258Smlaier } 2267126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2268126258Smlaier PF_ACPY(init_addr, naddr, af); 2269126258Smlaier 2270126258Smlaier } else { 2271126258Smlaier PF_AINC(&rpool->counter, af); 2272126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2273126258Smlaier } 2274126258Smlaier break; 2275126258Smlaier case PF_POOL_SRCHASH: 2276126258Smlaier pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2277126258Smlaier PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2278126258Smlaier break; 2279126258Smlaier case PF_POOL_ROUNDROBIN: 2280126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2281126258Smlaier if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2282126258Smlaier &rpool->tblidx, &rpool->counter, 2283126258Smlaier &raddr, &rmask, af)) 2284126258Smlaier goto get_addr; 2285130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2286130613Smlaier if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2287130613Smlaier &rpool->tblidx, &rpool->counter, 2288130613Smlaier &raddr, &rmask, af)) 2289130613Smlaier goto get_addr; 2290126258Smlaier } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2291126258Smlaier goto get_addr; 2292126258Smlaier 2293126258Smlaier try_next: 2294126258Smlaier if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2295126258Smlaier rpool->cur = TAILQ_FIRST(&rpool->list); 2296126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2297126258Smlaier rpool->tblidx = -1; 2298126258Smlaier if (pfr_pool_get(rpool->cur->addr.p.tbl, 2299126258Smlaier &rpool->tblidx, &rpool->counter, 2300126258Smlaier &raddr, &rmask, af)) { 2301130613Smlaier /* table contains no address of type 'af' */ 2302126258Smlaier if (rpool->cur != acur) 2303126258Smlaier goto try_next; 2304126258Smlaier return (1); 2305126258Smlaier } 2306130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2307130613Smlaier rpool->tblidx = -1; 2308130613Smlaier if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2309130613Smlaier &rpool->tblidx, &rpool->counter, 2310130613Smlaier &raddr, &rmask, af)) { 2311130613Smlaier /* table contains no address of type 'af' */ 2312130613Smlaier if (rpool->cur != acur) 2313130613Smlaier goto try_next; 2314130613Smlaier return (1); 2315130613Smlaier } 2316126258Smlaier } else { 2317126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 2318126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 2319126258Smlaier PF_ACPY(&rpool->counter, raddr, af); 2320126258Smlaier } 2321126258Smlaier 2322126258Smlaier get_addr: 2323126258Smlaier PF_ACPY(naddr, &rpool->counter, af); 2324139045Sdhartmei if (init_addr != NULL && PF_AZERO(init_addr, af)) 2325139045Sdhartmei PF_ACPY(init_addr, naddr, af); 2326126258Smlaier PF_AINC(&rpool->counter, af); 2327126258Smlaier break; 2328126258Smlaier } 2329130613Smlaier if (*sn != NULL) 2330130613Smlaier PF_ACPY(&(*sn)->raddr, naddr, af); 2331126258Smlaier 2332126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC && 2333126258Smlaier (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2334130613Smlaier printf("pf_map_addr: selected address "); 2335126258Smlaier pf_print_host(naddr, 0, af); 2336126258Smlaier printf("\n"); 2337126258Smlaier } 2338126258Smlaier 2339126258Smlaier return (0); 2340126258Smlaier} 2341126258Smlaier 2342126258Smlaierint 2343130613Smlaierpf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2344126258Smlaier struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2345130613Smlaier struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2346130613Smlaier struct pf_src_node **sn) 2347126258Smlaier{ 2348130613Smlaier struct pf_state key; 2349126258Smlaier struct pf_addr init_addr; 2350126258Smlaier u_int16_t cut; 2351126258Smlaier 2352126258Smlaier bzero(&init_addr, sizeof(init_addr)); 2353130613Smlaier if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2354126258Smlaier return (1); 2355126258Smlaier 2356149884Smlaier if (proto == IPPROTO_ICMP) { 2357149884Smlaier low = 1; 2358149884Smlaier high = 65535; 2359149884Smlaier } 2360149884Smlaier 2361126258Smlaier do { 2362126258Smlaier key.af = af; 2363126258Smlaier key.proto = proto; 2364130613Smlaier PF_ACPY(&key.ext.addr, daddr, key.af); 2365130613Smlaier PF_ACPY(&key.gwy.addr, naddr, key.af); 2366130613Smlaier key.ext.port = dport; 2367126258Smlaier 2368126258Smlaier /* 2369126258Smlaier * port search; start random, step; 2370126258Smlaier * similar 2 portloop in in_pcbbind 2371126258Smlaier */ 2372149884Smlaier if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2373149884Smlaier proto == IPPROTO_ICMP)) { 2374139045Sdhartmei key.gwy.port = dport; 2375130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2376126258Smlaier return (0); 2377126258Smlaier } else if (low == 0 && high == 0) { 2378130613Smlaier key.gwy.port = *nport; 2379130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2380126258Smlaier return (0); 2381126258Smlaier } else if (low == high) { 2382130613Smlaier key.gwy.port = htons(low); 2383130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2384126258Smlaier *nport = htons(low); 2385126258Smlaier return (0); 2386126258Smlaier } 2387126258Smlaier } else { 2388126258Smlaier u_int16_t tmp; 2389126258Smlaier 2390126258Smlaier if (low > high) { 2391126258Smlaier tmp = low; 2392126258Smlaier low = high; 2393126258Smlaier high = tmp; 2394126258Smlaier } 2395126258Smlaier /* low < high */ 2396145836Smlaier cut = htonl(arc4random()) % (1 + high - low) + low; 2397126258Smlaier /* low <= cut <= high */ 2398126258Smlaier for (tmp = cut; tmp <= high; ++(tmp)) { 2399130613Smlaier key.gwy.port = htons(tmp); 2400130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2401126258Smlaier NULL) { 2402126258Smlaier *nport = htons(tmp); 2403126258Smlaier return (0); 2404126258Smlaier } 2405126258Smlaier } 2406126258Smlaier for (tmp = cut - 1; tmp >= low; --(tmp)) { 2407130613Smlaier key.gwy.port = htons(tmp); 2408130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2409126258Smlaier NULL) { 2410126258Smlaier *nport = htons(tmp); 2411126258Smlaier return (0); 2412126258Smlaier } 2413126258Smlaier } 2414126258Smlaier } 2415126258Smlaier 2416130613Smlaier switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2417126258Smlaier case PF_POOL_RANDOM: 2418126258Smlaier case PF_POOL_ROUNDROBIN: 2419130613Smlaier if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2420126258Smlaier return (1); 2421126258Smlaier break; 2422126258Smlaier case PF_POOL_NONE: 2423126258Smlaier case PF_POOL_SRCHASH: 2424126258Smlaier case PF_POOL_BITMASK: 2425126258Smlaier default: 2426126258Smlaier return (1); 2427126258Smlaier } 2428126258Smlaier } while (! PF_AEQ(&init_addr, naddr, af) ); 2429126258Smlaier 2430126258Smlaier return (1); /* none available */ 2431126258Smlaier} 2432126258Smlaier 2433126258Smlaierstruct pf_rule * 2434126258Smlaierpf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2435130613Smlaier int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2436126258Smlaier struct pf_addr *daddr, u_int16_t dport, int rs_num) 2437126258Smlaier{ 2438145836Smlaier struct pf_rule *r, *rm = NULL; 2439126258Smlaier struct pf_ruleset *ruleset = NULL; 2440145836Smlaier struct pf_tag *pftag = NULL; 2441145836Smlaier int tag = -1; 2442145836Smlaier int asd = 0; 2443126258Smlaier 2444126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2445126258Smlaier while (r && rm == NULL) { 2446126258Smlaier struct pf_rule_addr *src = NULL, *dst = NULL; 2447126258Smlaier struct pf_addr_wrap *xdst = NULL; 2448126258Smlaier 2449126258Smlaier if (r->action == PF_BINAT && direction == PF_IN) { 2450126258Smlaier src = &r->dst; 2451126258Smlaier if (r->rpool.cur != NULL) 2452126258Smlaier xdst = &r->rpool.cur->addr; 2453126258Smlaier } else { 2454126258Smlaier src = &r->src; 2455126258Smlaier dst = &r->dst; 2456126258Smlaier } 2457126258Smlaier 2458126258Smlaier r->evaluations++; 2459130613Smlaier if (r->kif != NULL && 2460130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 2461126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 2462126258Smlaier else if (r->direction && r->direction != direction) 2463126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 2464126258Smlaier else if (r->af && r->af != pd->af) 2465126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 2466126258Smlaier else if (r->proto && r->proto != pd->proto) 2467126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 2468145836Smlaier else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->neg)) 2469126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2470126258Smlaier PF_SKIP_DST_ADDR].ptr; 2471126258Smlaier else if (src->port_op && !pf_match_port(src->port_op, 2472126258Smlaier src->port[0], src->port[1], sport)) 2473126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2474126258Smlaier PF_SKIP_DST_PORT].ptr; 2475126258Smlaier else if (dst != NULL && 2476145836Smlaier PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg)) 2477126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 2478126258Smlaier else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0)) 2479126258Smlaier r = TAILQ_NEXT(r, entries); 2480126258Smlaier else if (dst != NULL && dst->port_op && 2481126258Smlaier !pf_match_port(dst->port_op, dst->port[0], 2482126258Smlaier dst->port[1], dport)) 2483126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 2484145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 2485145836Smlaier r = TAILQ_NEXT(r, entries); 2486126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2487126258Smlaier IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2488126258Smlaier off, pd->hdr.tcp), r->os_fingerprint))) 2489126258Smlaier r = TAILQ_NEXT(r, entries); 2490145836Smlaier else { 2491145836Smlaier if (r->tag) 2492145836Smlaier tag = r->tag; 2493145836Smlaier if (r->anchor == NULL) { 2494126258Smlaier rm = r; 2495145836Smlaier } else 2496145836Smlaier pf_step_into_anchor(&asd, &ruleset, rs_num, &r, NULL); 2497145836Smlaier } 2498145836Smlaier if (r == NULL) 2499145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, NULL); 2500126258Smlaier } 2501145836Smlaier if (pf_tag_packet(m, pftag, tag)) 2502145836Smlaier return (NULL); 2503126258Smlaier if (rm != NULL && (rm->action == PF_NONAT || 2504126258Smlaier rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2505126258Smlaier return (NULL); 2506126258Smlaier return (rm); 2507126258Smlaier} 2508126258Smlaier 2509126258Smlaierstruct pf_rule * 2510126258Smlaierpf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2511130613Smlaier struct pfi_kif *kif, struct pf_src_node **sn, 2512126258Smlaier struct pf_addr *saddr, u_int16_t sport, 2513126258Smlaier struct pf_addr *daddr, u_int16_t dport, 2514126258Smlaier struct pf_addr *naddr, u_int16_t *nport) 2515126258Smlaier{ 2516126258Smlaier struct pf_rule *r = NULL; 2517126258Smlaier 2518126258Smlaier if (direction == PF_OUT) { 2519130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, saddr, 2520126258Smlaier sport, daddr, dport, PF_RULESET_BINAT); 2521126258Smlaier if (r == NULL) 2522130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, 2523126258Smlaier saddr, sport, daddr, dport, PF_RULESET_NAT); 2524126258Smlaier } else { 2525130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, saddr, 2526126258Smlaier sport, daddr, dport, PF_RULESET_RDR); 2527126258Smlaier if (r == NULL) 2528130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, 2529126258Smlaier saddr, sport, daddr, dport, PF_RULESET_BINAT); 2530126258Smlaier } 2531126258Smlaier 2532126258Smlaier if (r != NULL) { 2533126258Smlaier switch (r->action) { 2534126258Smlaier case PF_NONAT: 2535126258Smlaier case PF_NOBINAT: 2536126258Smlaier case PF_NORDR: 2537126258Smlaier return (NULL); 2538126258Smlaier case PF_NAT: 2539130613Smlaier if (pf_get_sport(pd->af, pd->proto, r, saddr, 2540126258Smlaier daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2541130613Smlaier r->rpool.proxy_port[1], sn)) { 2542126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 2543126258Smlaier ("pf: NAT proxy port allocation " 2544126258Smlaier "(%u-%u) failed\n", 2545126258Smlaier r->rpool.proxy_port[0], 2546126258Smlaier r->rpool.proxy_port[1])); 2547126258Smlaier return (NULL); 2548126258Smlaier } 2549126258Smlaier break; 2550126258Smlaier case PF_BINAT: 2551126258Smlaier switch (direction) { 2552126258Smlaier case PF_OUT: 2553130613Smlaier if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2554145836Smlaier switch (pd->af) { 2555145836Smlaier#ifdef INET 2556145836Smlaier case AF_INET: 2557130613Smlaier if (r->rpool.cur->addr.p.dyn-> 2558130613Smlaier pfid_acnt4 < 1) 2559130613Smlaier return (NULL); 2560130613Smlaier PF_POOLMASK(naddr, 2561130613Smlaier &r->rpool.cur->addr.p.dyn-> 2562130613Smlaier pfid_addr4, 2563130613Smlaier &r->rpool.cur->addr.p.dyn-> 2564130613Smlaier pfid_mask4, 2565130613Smlaier saddr, AF_INET); 2566145836Smlaier break; 2567145836Smlaier#endif /* INET */ 2568145836Smlaier#ifdef INET6 2569145836Smlaier case AF_INET6: 2570130613Smlaier if (r->rpool.cur->addr.p.dyn-> 2571130613Smlaier pfid_acnt6 < 1) 2572130613Smlaier return (NULL); 2573130613Smlaier PF_POOLMASK(naddr, 2574130613Smlaier &r->rpool.cur->addr.p.dyn-> 2575130613Smlaier pfid_addr6, 2576130613Smlaier &r->rpool.cur->addr.p.dyn-> 2577130613Smlaier pfid_mask6, 2578130613Smlaier saddr, AF_INET6); 2579145836Smlaier break; 2580145836Smlaier#endif /* INET6 */ 2581130613Smlaier } 2582130613Smlaier } else 2583126258Smlaier PF_POOLMASK(naddr, 2584126258Smlaier &r->rpool.cur->addr.v.a.addr, 2585126258Smlaier &r->rpool.cur->addr.v.a.mask, 2586126258Smlaier saddr, pd->af); 2587126258Smlaier break; 2588126258Smlaier case PF_IN: 2589138041Sdhartmei if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2590145836Smlaier switch (pd->af) { 2591145836Smlaier#ifdef INET 2592145836Smlaier case AF_INET: 2593130613Smlaier if (r->src.addr.p.dyn-> 2594130613Smlaier pfid_acnt4 < 1) 2595130613Smlaier return (NULL); 2596130613Smlaier PF_POOLMASK(naddr, 2597130613Smlaier &r->src.addr.p.dyn-> 2598130613Smlaier pfid_addr4, 2599130613Smlaier &r->src.addr.p.dyn-> 2600130613Smlaier pfid_mask4, 2601130613Smlaier daddr, AF_INET); 2602145836Smlaier break; 2603145836Smlaier#endif /* INET */ 2604145836Smlaier#ifdef INET6 2605145836Smlaier case AF_INET6: 2606130613Smlaier if (r->src.addr.p.dyn-> 2607130613Smlaier pfid_acnt6 < 1) 2608130613Smlaier return (NULL); 2609130613Smlaier PF_POOLMASK(naddr, 2610130613Smlaier &r->src.addr.p.dyn-> 2611130613Smlaier pfid_addr6, 2612130613Smlaier &r->src.addr.p.dyn-> 2613130613Smlaier pfid_mask6, 2614130613Smlaier daddr, AF_INET6); 2615145836Smlaier break; 2616145836Smlaier#endif /* INET6 */ 2617130613Smlaier } 2618130613Smlaier } else 2619126258Smlaier PF_POOLMASK(naddr, 2620126258Smlaier &r->src.addr.v.a.addr, 2621126261Smlaier &r->src.addr.v.a.mask, daddr, 2622126258Smlaier pd->af); 2623126258Smlaier break; 2624126258Smlaier } 2625126258Smlaier break; 2626126258Smlaier case PF_RDR: { 2627140518Sdhartmei if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2628126258Smlaier return (NULL); 2629149884Smlaier if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2630149884Smlaier PF_POOL_BITMASK) 2631149884Smlaier PF_POOLMASK(naddr, naddr, 2632149884Smlaier &r->rpool.cur->addr.v.a.mask, daddr, 2633149884Smlaier pd->af); 2634126258Smlaier 2635126258Smlaier if (r->rpool.proxy_port[1]) { 2636126258Smlaier u_int32_t tmp_nport; 2637126258Smlaier 2638126258Smlaier tmp_nport = ((ntohs(dport) - 2639126258Smlaier ntohs(r->dst.port[0])) % 2640126258Smlaier (r->rpool.proxy_port[1] - 2641126258Smlaier r->rpool.proxy_port[0] + 1)) + 2642126258Smlaier r->rpool.proxy_port[0]; 2643126258Smlaier 2644126258Smlaier /* wrap around if necessary */ 2645126258Smlaier if (tmp_nport > 65535) 2646126258Smlaier tmp_nport -= 65535; 2647126258Smlaier *nport = htons((u_int16_t)tmp_nport); 2648126258Smlaier } else if (r->rpool.proxy_port[0]) 2649126258Smlaier *nport = htons(r->rpool.proxy_port[0]); 2650126258Smlaier break; 2651126258Smlaier } 2652126258Smlaier default: 2653126258Smlaier return (NULL); 2654126258Smlaier } 2655126258Smlaier } 2656126258Smlaier 2657126258Smlaier return (r); 2658126258Smlaier} 2659126258Smlaier 2660126258Smlaierint 2661135920Smlaier#ifdef __FreeBSD__ 2662135920Smlaierpf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd, 2663135920Smlaier struct inpcb *inp_arg) 2664135920Smlaier#else 2665130613Smlaierpf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd) 2666135920Smlaier#endif 2667126258Smlaier{ 2668126258Smlaier struct pf_addr *saddr, *daddr; 2669126258Smlaier u_int16_t sport, dport; 2670127145Smlaier#ifdef __FreeBSD__ 2671126261Smlaier struct inpcbinfo *pi; 2672126261Smlaier#else 2673126258Smlaier struct inpcbtable *tb; 2674126261Smlaier#endif 2675126258Smlaier struct inpcb *inp; 2676126258Smlaier 2677126258Smlaier *uid = UID_MAX; 2678126258Smlaier *gid = GID_MAX; 2679135920Smlaier#ifdef __FreeBSD__ 2680135920Smlaier if (inp_arg != NULL) { 2681135920Smlaier INP_LOCK_ASSERT(inp_arg); 2682135920Smlaier if (inp_arg->inp_socket) { 2683135920Smlaier *uid = inp_arg->inp_socket->so_cred->cr_uid; 2684135920Smlaier *gid = inp_arg->inp_socket->so_cred->cr_groups[0]; 2685135920Smlaier return (1); 2686135920Smlaier } else 2687135920Smlaier return (0); 2688135920Smlaier } 2689135920Smlaier#endif 2690130613Smlaier switch (pd->proto) { 2691126258Smlaier case IPPROTO_TCP: 2692126258Smlaier sport = pd->hdr.tcp->th_sport; 2693126258Smlaier dport = pd->hdr.tcp->th_dport; 2694127145Smlaier#ifdef __FreeBSD__ 2695126261Smlaier pi = &tcbinfo; 2696126261Smlaier#else 2697126258Smlaier tb = &tcbtable; 2698126261Smlaier#endif 2699126258Smlaier break; 2700126258Smlaier case IPPROTO_UDP: 2701126258Smlaier sport = pd->hdr.udp->uh_sport; 2702126258Smlaier dport = pd->hdr.udp->uh_dport; 2703127145Smlaier#ifdef __FreeBSD__ 2704126261Smlaier pi = &udbinfo; 2705126261Smlaier#else 2706126258Smlaier tb = &udbtable; 2707126261Smlaier#endif 2708126258Smlaier break; 2709126258Smlaier default: 2710126258Smlaier return (0); 2711126258Smlaier } 2712126258Smlaier if (direction == PF_IN) { 2713126258Smlaier saddr = pd->src; 2714126258Smlaier daddr = pd->dst; 2715126258Smlaier } else { 2716126258Smlaier u_int16_t p; 2717126258Smlaier 2718126258Smlaier p = sport; 2719126258Smlaier sport = dport; 2720126258Smlaier dport = p; 2721126258Smlaier saddr = pd->dst; 2722126258Smlaier daddr = pd->src; 2723126258Smlaier } 2724130613Smlaier switch (pd->af) { 2725145836Smlaier#ifdef INET 2726126258Smlaier case AF_INET: 2727127145Smlaier#ifdef __FreeBSD__ 2728126261Smlaier INP_INFO_RLOCK(pi); /* XXX LOR */ 2729126261Smlaier inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2730126261Smlaier dport, 0, NULL); 2731126261Smlaier if (inp == NULL) { 2732126261Smlaier inp = in_pcblookup_hash(pi, saddr->v4, sport, 2733126261Smlaier daddr->v4, dport, INPLOOKUP_WILDCARD, NULL); 2734126261Smlaier if(inp == NULL) { 2735126261Smlaier INP_INFO_RUNLOCK(pi); 2736126261Smlaier return (0); 2737126261Smlaier } 2738126261Smlaier } 2739126261Smlaier#else 2740126258Smlaier inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 2741126258Smlaier if (inp == NULL) { 2742130613Smlaier inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 2743126258Smlaier if (inp == NULL) 2744126258Smlaier return (0); 2745126258Smlaier } 2746126261Smlaier#endif 2747126258Smlaier break; 2748145836Smlaier#endif /* INET */ 2749126258Smlaier#ifdef INET6 2750126258Smlaier case AF_INET6: 2751127145Smlaier#ifdef __FreeBSD__ 2752126261Smlaier INP_INFO_RLOCK(pi); 2753126261Smlaier inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2754126261Smlaier &daddr->v6, dport, 0, NULL); 2755126261Smlaier if (inp == NULL) { 2756126261Smlaier inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2757126261Smlaier &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2758126261Smlaier if (inp == NULL) { 2759126261Smlaier INP_INFO_RUNLOCK(pi); 2760126261Smlaier return (0); 2761126261Smlaier } 2762126261Smlaier } 2763126261Smlaier#else 2764126258Smlaier inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 2765126258Smlaier dport); 2766126258Smlaier if (inp == NULL) { 2767130613Smlaier inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 2768126258Smlaier if (inp == NULL) 2769126258Smlaier return (0); 2770126258Smlaier } 2771126261Smlaier#endif 2772126258Smlaier break; 2773126258Smlaier#endif /* INET6 */ 2774126258Smlaier 2775126258Smlaier default: 2776126258Smlaier return (0); 2777126258Smlaier } 2778127145Smlaier#ifdef __FreeBSD__ 2779126261Smlaier INP_LOCK(inp); 2780136925Smlaier if ((inp->inp_socket == NULL) || (inp->inp_socket->so_cred == NULL)) { 2781136925Smlaier INP_UNLOCK(inp); 2782136925Smlaier INP_INFO_RUNLOCK(pi); 2783136925Smlaier return (0); 2784136925Smlaier } 2785126261Smlaier *uid = inp->inp_socket->so_cred->cr_uid; 2786126261Smlaier *gid = inp->inp_socket->so_cred->cr_groups[0]; 2787126261Smlaier INP_UNLOCK(inp); 2788126261Smlaier INP_INFO_RUNLOCK(pi); 2789126261Smlaier#else 2790126258Smlaier *uid = inp->inp_socket->so_euid; 2791126258Smlaier *gid = inp->inp_socket->so_egid; 2792126261Smlaier#endif 2793126258Smlaier return (1); 2794126258Smlaier} 2795126258Smlaier 2796126258Smlaieru_int8_t 2797126258Smlaierpf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2798126258Smlaier{ 2799126258Smlaier int hlen; 2800126258Smlaier u_int8_t hdr[60]; 2801126258Smlaier u_int8_t *opt, optlen; 2802126258Smlaier u_int8_t wscale = 0; 2803126258Smlaier 2804126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2805126258Smlaier if (hlen <= sizeof(struct tcphdr)) 2806126258Smlaier return (0); 2807126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2808126258Smlaier return (0); 2809126258Smlaier opt = hdr + sizeof(struct tcphdr); 2810126258Smlaier hlen -= sizeof(struct tcphdr); 2811126258Smlaier while (hlen >= 3) { 2812126258Smlaier switch (*opt) { 2813126258Smlaier case TCPOPT_EOL: 2814126258Smlaier case TCPOPT_NOP: 2815126258Smlaier ++opt; 2816126258Smlaier --hlen; 2817126258Smlaier break; 2818126258Smlaier case TCPOPT_WINDOW: 2819126258Smlaier wscale = opt[2]; 2820126258Smlaier if (wscale > TCP_MAX_WINSHIFT) 2821126258Smlaier wscale = TCP_MAX_WINSHIFT; 2822126258Smlaier wscale |= PF_WSCALE_FLAG; 2823130613Smlaier /* FALLTHROUGH */ 2824126258Smlaier default: 2825126258Smlaier optlen = opt[1]; 2826126258Smlaier if (optlen < 2) 2827126258Smlaier optlen = 2; 2828126258Smlaier hlen -= optlen; 2829126258Smlaier opt += optlen; 2830130613Smlaier break; 2831126258Smlaier } 2832126258Smlaier } 2833126258Smlaier return (wscale); 2834126258Smlaier} 2835126258Smlaier 2836126258Smlaieru_int16_t 2837126258Smlaierpf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2838126258Smlaier{ 2839126258Smlaier int hlen; 2840126258Smlaier u_int8_t hdr[60]; 2841126258Smlaier u_int8_t *opt, optlen; 2842126258Smlaier u_int16_t mss = tcp_mssdflt; 2843126258Smlaier 2844126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2845126258Smlaier if (hlen <= sizeof(struct tcphdr)) 2846126258Smlaier return (0); 2847126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2848126258Smlaier return (0); 2849126258Smlaier opt = hdr + sizeof(struct tcphdr); 2850126258Smlaier hlen -= sizeof(struct tcphdr); 2851126258Smlaier while (hlen >= TCPOLEN_MAXSEG) { 2852126258Smlaier switch (*opt) { 2853126258Smlaier case TCPOPT_EOL: 2854126258Smlaier case TCPOPT_NOP: 2855126258Smlaier ++opt; 2856126258Smlaier --hlen; 2857126258Smlaier break; 2858126258Smlaier case TCPOPT_MAXSEG: 2859126258Smlaier bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2860145030Sglebius NTOHS(mss); 2861130613Smlaier /* FALLTHROUGH */ 2862126258Smlaier default: 2863126258Smlaier optlen = opt[1]; 2864126258Smlaier if (optlen < 2) 2865126258Smlaier optlen = 2; 2866126258Smlaier hlen -= optlen; 2867126258Smlaier opt += optlen; 2868130613Smlaier break; 2869126258Smlaier } 2870126258Smlaier } 2871126258Smlaier return (mss); 2872126258Smlaier} 2873126258Smlaier 2874126258Smlaieru_int16_t 2875126258Smlaierpf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2876126258Smlaier{ 2877126258Smlaier#ifdef INET 2878126258Smlaier struct sockaddr_in *dst; 2879126258Smlaier struct route ro; 2880126258Smlaier#endif /* INET */ 2881126258Smlaier#ifdef INET6 2882126258Smlaier struct sockaddr_in6 *dst6; 2883126258Smlaier struct route_in6 ro6; 2884126258Smlaier#endif /* INET6 */ 2885126258Smlaier struct rtentry *rt = NULL; 2886127629Smlaier int hlen = 0; /* make the compiler happy */ 2887126258Smlaier u_int16_t mss = tcp_mssdflt; 2888126258Smlaier 2889126258Smlaier switch (af) { 2890126258Smlaier#ifdef INET 2891126258Smlaier case AF_INET: 2892126258Smlaier hlen = sizeof(struct ip); 2893126258Smlaier bzero(&ro, sizeof(ro)); 2894126258Smlaier dst = (struct sockaddr_in *)&ro.ro_dst; 2895126258Smlaier dst->sin_family = AF_INET; 2896126258Smlaier dst->sin_len = sizeof(*dst); 2897126258Smlaier dst->sin_addr = addr->v4; 2898127145Smlaier#ifdef __FreeBSD__ 2899126261Smlaier#ifdef RTF_PRCLONING 2900126261Smlaier rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 2901126261Smlaier#else /* !RTF_PRCLONING */ 2902126261Smlaier rtalloc_ign(&ro, RTF_CLONING); 2903126261Smlaier#endif 2904126261Smlaier#else /* ! __FreeBSD__ */ 2905126258Smlaier rtalloc_noclone(&ro, NO_CLONING); 2906126261Smlaier#endif 2907126258Smlaier rt = ro.ro_rt; 2908126258Smlaier break; 2909126258Smlaier#endif /* INET */ 2910126258Smlaier#ifdef INET6 2911126258Smlaier case AF_INET6: 2912126258Smlaier hlen = sizeof(struct ip6_hdr); 2913126258Smlaier bzero(&ro6, sizeof(ro6)); 2914126258Smlaier dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2915126258Smlaier dst6->sin6_family = AF_INET6; 2916126258Smlaier dst6->sin6_len = sizeof(*dst6); 2917126258Smlaier dst6->sin6_addr = addr->v6; 2918127145Smlaier#ifdef __FreeBSD__ 2919126261Smlaier#ifdef RTF_PRCLONING 2920126261Smlaier rtalloc_ign((struct route *)&ro6, 2921126261Smlaier (RTF_CLONING | RTF_PRCLONING)); 2922126261Smlaier#else /* !RTF_PRCLONING */ 2923126261Smlaier rtalloc_ign((struct route *)&ro6, RTF_CLONING); 2924126261Smlaier#endif 2925126261Smlaier#else /* ! __FreeBSD__ */ 2926126258Smlaier rtalloc_noclone((struct route *)&ro6, NO_CLONING); 2927126261Smlaier#endif 2928126258Smlaier rt = ro6.ro_rt; 2929126258Smlaier break; 2930126258Smlaier#endif /* INET6 */ 2931126258Smlaier } 2932126258Smlaier 2933126258Smlaier if (rt && rt->rt_ifp) { 2934126258Smlaier mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2935126258Smlaier mss = max(tcp_mssdflt, mss); 2936126258Smlaier RTFREE(rt); 2937126258Smlaier } 2938126258Smlaier mss = min(mss, offer); 2939126258Smlaier mss = max(mss, 64); /* sanity - at least max opt space */ 2940126258Smlaier return (mss); 2941126258Smlaier} 2942126258Smlaier 2943126258Smlaiervoid 2944126258Smlaierpf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2945126258Smlaier{ 2946126258Smlaier struct pf_rule *r = s->rule.ptr; 2947126258Smlaier 2948130613Smlaier s->rt_kif = NULL; 2949126258Smlaier if (!r->rt || r->rt == PF_FASTROUTE) 2950126258Smlaier return; 2951126258Smlaier switch (s->af) { 2952126258Smlaier#ifdef INET 2953126258Smlaier case AF_INET: 2954130613Smlaier pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 2955130613Smlaier &s->nat_src_node); 2956130613Smlaier s->rt_kif = r->rpool.cur->kif; 2957126258Smlaier break; 2958126258Smlaier#endif /* INET */ 2959126258Smlaier#ifdef INET6 2960126258Smlaier case AF_INET6: 2961130613Smlaier pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 2962130613Smlaier &s->nat_src_node); 2963130613Smlaier s->rt_kif = r->rpool.cur->kif; 2964126258Smlaier break; 2965126258Smlaier#endif /* INET6 */ 2966126258Smlaier } 2967126258Smlaier} 2968126258Smlaier 2969126258Smlaierint 2970126258Smlaierpf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 2971130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 2972135920Smlaier#ifdef __FreeBSD__ 2973135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 2974145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 2975135920Smlaier#else 2976145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 2977145836Smlaier struct ifqueue *ifq) 2978135920Smlaier#endif 2979126258Smlaier{ 2980130613Smlaier struct pf_rule *nr = NULL; 2981126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2982126258Smlaier struct tcphdr *th = pd->hdr.tcp; 2983126258Smlaier u_int16_t bport, nport = 0; 2984126258Smlaier sa_family_t af = pd->af; 2985126258Smlaier int lookup = -1; 2986126258Smlaier uid_t uid; 2987126258Smlaier gid_t gid; 2988126258Smlaier struct pf_rule *r, *a = NULL; 2989126258Smlaier struct pf_ruleset *ruleset = NULL; 2990130613Smlaier struct pf_src_node *nsn = NULL; 2991126258Smlaier u_short reason; 2992126258Smlaier int rewrite = 0; 2993126258Smlaier struct pf_tag *pftag = NULL; 2994126258Smlaier int tag = -1; 2995126258Smlaier u_int16_t mss = tcp_mssdflt; 2996145836Smlaier int asd = 0; 2997126258Smlaier 2998145836Smlaier if (pf_check_congestion(ifq)) { 2999145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3000145836Smlaier return (PF_DROP); 3001145836Smlaier } 3002145836Smlaier 3003126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3004126258Smlaier 3005126258Smlaier if (direction == PF_OUT) { 3006126258Smlaier bport = nport = th->th_sport; 3007126258Smlaier /* check outgoing packet for BINAT/NAT */ 3008130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3009126258Smlaier saddr, th->th_sport, daddr, th->th_dport, 3010130613Smlaier &pd->naddr, &nport)) != NULL) { 3011130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3012126258Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3013130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 3014126258Smlaier rewrite++; 3015130613Smlaier if (nr->natpass) 3016126258Smlaier r = NULL; 3017130613Smlaier pd->nat_rule = nr; 3018126258Smlaier } 3019126258Smlaier } else { 3020126258Smlaier bport = nport = th->th_dport; 3021126258Smlaier /* check incoming packet for BINAT/RDR */ 3022130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3023130613Smlaier saddr, th->th_sport, daddr, th->th_dport, 3024130613Smlaier &pd->naddr, &nport)) != NULL) { 3025130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3026126258Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3027130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 3028126258Smlaier rewrite++; 3029130613Smlaier if (nr->natpass) 3030126258Smlaier r = NULL; 3031130613Smlaier pd->nat_rule = nr; 3032126258Smlaier } 3033126258Smlaier } 3034126258Smlaier 3035126258Smlaier while (r != NULL) { 3036126258Smlaier r->evaluations++; 3037130613Smlaier if (r->kif != NULL && 3038130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3039126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3040126258Smlaier else if (r->direction && r->direction != direction) 3041126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3042126258Smlaier else if (r->af && r->af != af) 3043126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3044126258Smlaier else if (r->proto && r->proto != IPPROTO_TCP) 3045126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3046145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg)) 3047126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3048126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3049126258Smlaier r->src.port[0], r->src.port[1], th->th_sport)) 3050126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3051145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg)) 3052126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3053126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3054126258Smlaier r->dst.port[0], r->dst.port[1], th->th_dport)) 3055126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3056126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 3057126258Smlaier r = TAILQ_NEXT(r, entries); 3058126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3059126258Smlaier r = TAILQ_NEXT(r, entries); 3060126258Smlaier else if ((r->flagset & th->th_flags) != r->flags) 3061126258Smlaier r = TAILQ_NEXT(r, entries); 3062126258Smlaier else if (r->uid.op && (lookup != -1 || (lookup = 3063135920Smlaier#ifdef __FreeBSD__ 3064135920Smlaier pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3065135920Smlaier#else 3066130613Smlaier pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3067135920Smlaier#endif 3068126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3069126258Smlaier uid)) 3070126258Smlaier r = TAILQ_NEXT(r, entries); 3071126258Smlaier else if (r->gid.op && (lookup != -1 || (lookup = 3072135920Smlaier#ifdef __FreeBSD__ 3073135920Smlaier pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3074135920Smlaier#else 3075130613Smlaier pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3076135920Smlaier#endif 3077126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3078126258Smlaier gid)) 3079126258Smlaier r = TAILQ_NEXT(r, entries); 3080145836Smlaier else if (r->prob && r->prob <= arc4random()) 3081126258Smlaier r = TAILQ_NEXT(r, entries); 3082145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 3083126258Smlaier r = TAILQ_NEXT(r, entries); 3084126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3085126258Smlaier pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3086126258Smlaier r = TAILQ_NEXT(r, entries); 3087126258Smlaier else { 3088126258Smlaier if (r->tag) 3089126258Smlaier tag = r->tag; 3090126258Smlaier if (r->anchor == NULL) { 3091126258Smlaier *rm = r; 3092126258Smlaier *am = a; 3093126258Smlaier *rsm = ruleset; 3094126258Smlaier if ((*rm)->quick) 3095126258Smlaier break; 3096126258Smlaier r = TAILQ_NEXT(r, entries); 3097126258Smlaier } else 3098145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3099145836Smlaier PF_RULESET_FILTER, &r, &a); 3100126258Smlaier } 3101145836Smlaier if (r == NULL) 3102145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 3103145836Smlaier PF_RULESET_FILTER, &r, &a); 3104126258Smlaier } 3105126258Smlaier r = *rm; 3106126258Smlaier a = *am; 3107126258Smlaier ruleset = *rsm; 3108126258Smlaier 3109126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3110126258Smlaier 3111126258Smlaier if (r->log) { 3112126258Smlaier if (rewrite) 3113126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3114130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3115126258Smlaier } 3116126258Smlaier 3117126258Smlaier if ((r->action == PF_DROP) && 3118126258Smlaier ((r->rule_flag & PFRULE_RETURNRST) || 3119126258Smlaier (r->rule_flag & PFRULE_RETURNICMP) || 3120126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3121126258Smlaier /* undo NAT changes, if they have taken place */ 3122130613Smlaier if (nr != NULL) { 3123130613Smlaier if (direction == PF_OUT) { 3124130613Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3125130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3126130613Smlaier rewrite++; 3127130613Smlaier } else { 3128130613Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3129130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3130130613Smlaier rewrite++; 3131130613Smlaier } 3132126258Smlaier } 3133126258Smlaier if (((r->rule_flag & PFRULE_RETURNRST) || 3134126258Smlaier (r->rule_flag & PFRULE_RETURN)) && 3135126258Smlaier !(th->th_flags & TH_RST)) { 3136126258Smlaier u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3137126258Smlaier 3138126258Smlaier if (th->th_flags & TH_SYN) 3139126258Smlaier ack++; 3140126258Smlaier if (th->th_flags & TH_FIN) 3141126258Smlaier ack++; 3142126258Smlaier pf_send_tcp(r, af, pd->dst, 3143126258Smlaier pd->src, th->th_dport, th->th_sport, 3144126258Smlaier ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3145145836Smlaier r->return_ttl, 1, pd->eh, kif->pfik_ifp); 3146126258Smlaier } else if ((af == AF_INET) && r->return_icmp) 3147126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3148126258Smlaier r->return_icmp & 255, af, r); 3149126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3150126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3151126258Smlaier r->return_icmp6 & 255, af, r); 3152126258Smlaier } 3153126258Smlaier 3154126258Smlaier if (r->action == PF_DROP) 3155126258Smlaier return (PF_DROP); 3156126258Smlaier 3157126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 3158126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3159126258Smlaier return (PF_DROP); 3160126258Smlaier } 3161126258Smlaier 3162130613Smlaier if (r->keep_state || nr != NULL || 3163126258Smlaier (pd->flags & PFDESC_TCP_NORM)) { 3164126258Smlaier /* create new state */ 3165126258Smlaier u_int16_t len; 3166126258Smlaier struct pf_state *s = NULL; 3167130613Smlaier struct pf_src_node *sn = NULL; 3168126258Smlaier 3169126258Smlaier len = pd->tot_len - off - (th->th_off << 2); 3170130613Smlaier 3171130613Smlaier /* check maximums */ 3172145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3173145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3174145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3175130613Smlaier goto cleanup; 3176145836Smlaier } 3177130613Smlaier /* src node for flter rule */ 3178130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3179130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3180145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3181145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3182130613Smlaier goto cleanup; 3183145836Smlaier } 3184130613Smlaier /* src node for translation rule */ 3185130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3186130613Smlaier ((direction == PF_OUT && 3187130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3188145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3189145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3190130613Smlaier goto cleanup; 3191145836Smlaier } 3192130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3193126258Smlaier if (s == NULL) { 3194145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3195130613Smlaiercleanup: 3196130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3197130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3198130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3199130613Smlaier pf_status.src_nodes--; 3200130613Smlaier pool_put(&pf_src_tree_pl, sn); 3201130613Smlaier } 3202130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3203130613Smlaier nsn->expire == 0) { 3204130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3205130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3206130613Smlaier pf_status.src_nodes--; 3207130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3208130613Smlaier } 3209126258Smlaier return (PF_DROP); 3210126258Smlaier } 3211126258Smlaier bzero(s, sizeof(*s)); 3212126258Smlaier s->rule.ptr = r; 3213130613Smlaier s->nat_rule.ptr = nr; 3214126258Smlaier s->anchor.ptr = a; 3215145836Smlaier STATE_INC_COUNTERS(s); 3216126258Smlaier s->allow_opts = r->allow_opts; 3217126258Smlaier s->log = r->log & 2; 3218126258Smlaier s->proto = IPPROTO_TCP; 3219126258Smlaier s->direction = direction; 3220126258Smlaier s->af = af; 3221126258Smlaier if (direction == PF_OUT) { 3222126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3223126258Smlaier s->gwy.port = th->th_sport; /* sport */ 3224126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3225126258Smlaier s->ext.port = th->th_dport; 3226130613Smlaier if (nr != NULL) { 3227130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3228126258Smlaier s->lan.port = bport; 3229126258Smlaier } else { 3230126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3231126258Smlaier s->lan.port = s->gwy.port; 3232126258Smlaier } 3233126258Smlaier } else { 3234126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3235126258Smlaier s->lan.port = th->th_dport; 3236126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3237126258Smlaier s->ext.port = th->th_sport; 3238130613Smlaier if (nr != NULL) { 3239130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3240126258Smlaier s->gwy.port = bport; 3241126258Smlaier } else { 3242126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3243126258Smlaier s->gwy.port = s->lan.port; 3244126258Smlaier } 3245126258Smlaier } 3246126258Smlaier 3247126258Smlaier s->src.seqlo = ntohl(th->th_seq); 3248126258Smlaier s->src.seqhi = s->src.seqlo + len + 1; 3249126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3250126258Smlaier r->keep_state == PF_STATE_MODULATE) { 3251126258Smlaier /* Generate sequence number modulator */ 3252145836Smlaier while ((s->src.seqdiff = htonl(arc4random())) == 0) 3253126258Smlaier ; 3254126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, 3255126258Smlaier htonl(s->src.seqlo + s->src.seqdiff), 0); 3256126258Smlaier rewrite = 1; 3257126258Smlaier } else 3258126258Smlaier s->src.seqdiff = 0; 3259126258Smlaier if (th->th_flags & TH_SYN) { 3260126258Smlaier s->src.seqhi++; 3261126258Smlaier s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3262126258Smlaier } 3263126258Smlaier s->src.max_win = MAX(ntohs(th->th_win), 1); 3264126258Smlaier if (s->src.wscale & PF_WSCALE_MASK) { 3265126258Smlaier /* Remove scale factor from initial window */ 3266126258Smlaier int win = s->src.max_win; 3267126258Smlaier win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3268126258Smlaier s->src.max_win = (win - 1) >> 3269126258Smlaier (s->src.wscale & PF_WSCALE_MASK); 3270126258Smlaier } 3271126258Smlaier if (th->th_flags & TH_FIN) 3272126258Smlaier s->src.seqhi++; 3273126258Smlaier s->dst.seqhi = 1; 3274126258Smlaier s->dst.max_win = 1; 3275126258Smlaier s->src.state = TCPS_SYN_SENT; 3276126258Smlaier s->dst.state = TCPS_CLOSED; 3277126261Smlaier s->creation = time_second; 3278126261Smlaier s->expire = time_second; 3279126258Smlaier s->timeout = PFTM_TCP_FIRST_PACKET; 3280126258Smlaier pf_set_rt_ifp(s, saddr); 3281130613Smlaier if (sn != NULL) { 3282130613Smlaier s->src_node = sn; 3283130613Smlaier s->src_node->states++; 3284130613Smlaier } 3285130613Smlaier if (nsn != NULL) { 3286130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3287130613Smlaier s->nat_src_node = nsn; 3288130613Smlaier s->nat_src_node->states++; 3289130613Smlaier } 3290126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3291126258Smlaier off, pd, th, &s->src, &s->dst)) { 3292126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3293130613Smlaier pf_src_tree_remove_state(s); 3294145836Smlaier STATE_DEC_COUNTERS(s); 3295126258Smlaier pool_put(&pf_state_pl, s); 3296126258Smlaier return (PF_DROP); 3297126258Smlaier } 3298126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3299145836Smlaier pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3300145836Smlaier &s->src, &s->dst, &rewrite)) { 3301145836Smlaier /* This really shouldn't happen!!! */ 3302145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 3303145836Smlaier ("pf_normalize_tcp_stateful failed on first pkt")); 3304126258Smlaier pf_normalize_tcp_cleanup(s); 3305130613Smlaier pf_src_tree_remove_state(s); 3306145836Smlaier STATE_DEC_COUNTERS(s); 3307126258Smlaier pool_put(&pf_state_pl, s); 3308126258Smlaier return (PF_DROP); 3309126258Smlaier } 3310130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3311126258Smlaier pf_normalize_tcp_cleanup(s); 3312145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3313130613Smlaier pf_src_tree_remove_state(s); 3314145836Smlaier STATE_DEC_COUNTERS(s); 3315126258Smlaier pool_put(&pf_state_pl, s); 3316126258Smlaier return (PF_DROP); 3317126258Smlaier } else 3318126258Smlaier *sm = s; 3319145836Smlaier if (tag > 0) { 3320145836Smlaier pf_tag_ref(tag); 3321145836Smlaier s->tag = tag; 3322145836Smlaier } 3323126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3324126258Smlaier r->keep_state == PF_STATE_SYNPROXY) { 3325126258Smlaier s->src.state = PF_TCPS_PROXY_SRC; 3326130613Smlaier if (nr != NULL) { 3327130613Smlaier if (direction == PF_OUT) { 3328130613Smlaier pf_change_ap(saddr, &th->th_sport, 3329130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3330130613Smlaier bport, 0, af); 3331130613Smlaier } else { 3332130613Smlaier pf_change_ap(daddr, &th->th_dport, 3333130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3334130613Smlaier bport, 0, af); 3335130613Smlaier } 3336130613Smlaier } 3337145836Smlaier s->src.seqhi = htonl(arc4random()); 3338126258Smlaier /* Find mss option */ 3339126258Smlaier mss = pf_get_mss(m, off, th->th_off, af); 3340126258Smlaier mss = pf_calc_mss(saddr, af, mss); 3341126258Smlaier mss = pf_calc_mss(daddr, af, mss); 3342126258Smlaier s->src.mss = mss; 3343126258Smlaier pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3344130613Smlaier th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3345145836Smlaier TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, NULL, NULL); 3346145836Smlaier REASON_SET(&reason, PFRES_SYNPROXY); 3347126258Smlaier return (PF_SYNPROXY_DROP); 3348126258Smlaier } 3349126258Smlaier } 3350126258Smlaier 3351126258Smlaier /* copy back packet headers if we performed NAT operations */ 3352126258Smlaier if (rewrite) 3353126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3354126258Smlaier 3355126258Smlaier return (PF_PASS); 3356126258Smlaier} 3357126258Smlaier 3358126258Smlaierint 3359126258Smlaierpf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3360130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3361135920Smlaier#ifdef __FreeBSD__ 3362135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3363145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 3364135920Smlaier#else 3365145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3366145836Smlaier struct ifqueue *ifq) 3367135920Smlaier#endif 3368126258Smlaier{ 3369130613Smlaier struct pf_rule *nr = NULL; 3370126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3371126258Smlaier struct udphdr *uh = pd->hdr.udp; 3372126258Smlaier u_int16_t bport, nport = 0; 3373126258Smlaier sa_family_t af = pd->af; 3374126258Smlaier int lookup = -1; 3375126258Smlaier uid_t uid; 3376126258Smlaier gid_t gid; 3377126258Smlaier struct pf_rule *r, *a = NULL; 3378126258Smlaier struct pf_ruleset *ruleset = NULL; 3379130613Smlaier struct pf_src_node *nsn = NULL; 3380126258Smlaier u_short reason; 3381126258Smlaier int rewrite = 0; 3382126258Smlaier struct pf_tag *pftag = NULL; 3383126258Smlaier int tag = -1; 3384145836Smlaier int asd = 0; 3385126258Smlaier 3386145836Smlaier if (pf_check_congestion(ifq)) { 3387145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3388145836Smlaier return (PF_DROP); 3389145836Smlaier } 3390145836Smlaier 3391126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3392126258Smlaier 3393126258Smlaier if (direction == PF_OUT) { 3394126258Smlaier bport = nport = uh->uh_sport; 3395126258Smlaier /* check outgoing packet for BINAT/NAT */ 3396130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3397126258Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, 3398130613Smlaier &pd->naddr, &nport)) != NULL) { 3399130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3400126258Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3401130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3402126258Smlaier rewrite++; 3403130613Smlaier if (nr->natpass) 3404126258Smlaier r = NULL; 3405130613Smlaier pd->nat_rule = nr; 3406126258Smlaier } 3407126258Smlaier } else { 3408126258Smlaier bport = nport = uh->uh_dport; 3409126258Smlaier /* check incoming packet for BINAT/RDR */ 3410130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3411130613Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3412130613Smlaier &nport)) != NULL) { 3413130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3414126258Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3415130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3416126258Smlaier rewrite++; 3417130613Smlaier if (nr->natpass) 3418126258Smlaier r = NULL; 3419130613Smlaier pd->nat_rule = nr; 3420126258Smlaier } 3421126258Smlaier } 3422126258Smlaier 3423126258Smlaier while (r != NULL) { 3424126258Smlaier r->evaluations++; 3425130613Smlaier if (r->kif != NULL && 3426130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3427126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3428126258Smlaier else if (r->direction && r->direction != direction) 3429126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3430126258Smlaier else if (r->af && r->af != af) 3431126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3432126258Smlaier else if (r->proto && r->proto != IPPROTO_UDP) 3433126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3434145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg)) 3435126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3436126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3437126258Smlaier r->src.port[0], r->src.port[1], uh->uh_sport)) 3438126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3439145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg)) 3440126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3441126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3442126258Smlaier r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3443126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3444126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 3445126258Smlaier r = TAILQ_NEXT(r, entries); 3446126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3447126258Smlaier r = TAILQ_NEXT(r, entries); 3448126258Smlaier else if (r->uid.op && (lookup != -1 || (lookup = 3449135920Smlaier#ifdef __FreeBSD__ 3450135920Smlaier pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3451135920Smlaier#else 3452130613Smlaier pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3453135920Smlaier#endif 3454126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3455126258Smlaier uid)) 3456126258Smlaier r = TAILQ_NEXT(r, entries); 3457126258Smlaier else if (r->gid.op && (lookup != -1 || (lookup = 3458135920Smlaier#ifdef __FreeBSD__ 3459135920Smlaier pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3460135920Smlaier#else 3461130613Smlaier pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3462135920Smlaier#endif 3463126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3464126258Smlaier gid)) 3465126258Smlaier r = TAILQ_NEXT(r, entries); 3466145836Smlaier else if (r->prob && r->prob <= arc4random()) 3467126258Smlaier r = TAILQ_NEXT(r, entries); 3468145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 3469126258Smlaier r = TAILQ_NEXT(r, entries); 3470126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 3471126258Smlaier r = TAILQ_NEXT(r, entries); 3472126258Smlaier else { 3473126258Smlaier if (r->tag) 3474126258Smlaier tag = r->tag; 3475126258Smlaier if (r->anchor == NULL) { 3476126258Smlaier *rm = r; 3477126258Smlaier *am = a; 3478126258Smlaier *rsm = ruleset; 3479126258Smlaier if ((*rm)->quick) 3480126258Smlaier break; 3481126258Smlaier r = TAILQ_NEXT(r, entries); 3482126258Smlaier } else 3483145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3484145836Smlaier PF_RULESET_FILTER, &r, &a); 3485126258Smlaier } 3486145836Smlaier if (r == NULL) 3487145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 3488145836Smlaier PF_RULESET_FILTER, &r, &a); 3489126258Smlaier } 3490126258Smlaier r = *rm; 3491126258Smlaier a = *am; 3492126258Smlaier ruleset = *rsm; 3493126258Smlaier 3494126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3495126258Smlaier 3496126258Smlaier if (r->log) { 3497126258Smlaier if (rewrite) 3498126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3499130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3500126258Smlaier } 3501126258Smlaier 3502126258Smlaier if ((r->action == PF_DROP) && 3503126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 3504126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3505126258Smlaier /* undo NAT changes, if they have taken place */ 3506130613Smlaier if (nr != NULL) { 3507130613Smlaier if (direction == PF_OUT) { 3508130613Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3509130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3510130613Smlaier rewrite++; 3511130613Smlaier } else { 3512130613Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3513130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3514130613Smlaier rewrite++; 3515130613Smlaier } 3516126258Smlaier } 3517126258Smlaier if ((af == AF_INET) && r->return_icmp) 3518126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3519126258Smlaier r->return_icmp & 255, af, r); 3520126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3521126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3522126258Smlaier r->return_icmp6 & 255, af, r); 3523126258Smlaier } 3524126258Smlaier 3525126258Smlaier if (r->action == PF_DROP) 3526126258Smlaier return (PF_DROP); 3527126258Smlaier 3528126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 3529126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3530126258Smlaier return (PF_DROP); 3531126258Smlaier } 3532126258Smlaier 3533130613Smlaier if (r->keep_state || nr != NULL) { 3534126258Smlaier /* create new state */ 3535126258Smlaier struct pf_state *s = NULL; 3536130613Smlaier struct pf_src_node *sn = NULL; 3537126258Smlaier 3538130613Smlaier /* check maximums */ 3539145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3540145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3541145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3542130613Smlaier goto cleanup; 3543145836Smlaier } 3544130613Smlaier /* src node for flter rule */ 3545130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3546130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3547145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3548145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3549130613Smlaier goto cleanup; 3550145836Smlaier } 3551130613Smlaier /* src node for translation rule */ 3552130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3553130613Smlaier ((direction == PF_OUT && 3554130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3555145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3556145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3557130613Smlaier goto cleanup; 3558145836Smlaier } 3559130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3560126258Smlaier if (s == NULL) { 3561145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3562130613Smlaiercleanup: 3563130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3564130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3565130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3566130613Smlaier pf_status.src_nodes--; 3567130613Smlaier pool_put(&pf_src_tree_pl, sn); 3568130613Smlaier } 3569130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3570130613Smlaier nsn->expire == 0) { 3571130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3572130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3573130613Smlaier pf_status.src_nodes--; 3574130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3575130613Smlaier } 3576126258Smlaier return (PF_DROP); 3577126258Smlaier } 3578126258Smlaier bzero(s, sizeof(*s)); 3579126258Smlaier s->rule.ptr = r; 3580130613Smlaier s->nat_rule.ptr = nr; 3581126258Smlaier s->anchor.ptr = a; 3582145836Smlaier STATE_INC_COUNTERS(s); 3583126258Smlaier s->allow_opts = r->allow_opts; 3584126258Smlaier s->log = r->log & 2; 3585126258Smlaier s->proto = IPPROTO_UDP; 3586126258Smlaier s->direction = direction; 3587126258Smlaier s->af = af; 3588126258Smlaier if (direction == PF_OUT) { 3589126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3590126258Smlaier s->gwy.port = uh->uh_sport; 3591126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3592126258Smlaier s->ext.port = uh->uh_dport; 3593130613Smlaier if (nr != NULL) { 3594130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3595126258Smlaier s->lan.port = bport; 3596126258Smlaier } else { 3597126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3598126258Smlaier s->lan.port = s->gwy.port; 3599126258Smlaier } 3600126258Smlaier } else { 3601126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3602126258Smlaier s->lan.port = uh->uh_dport; 3603126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3604126258Smlaier s->ext.port = uh->uh_sport; 3605130613Smlaier if (nr != NULL) { 3606130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3607126258Smlaier s->gwy.port = bport; 3608126258Smlaier } else { 3609126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3610126258Smlaier s->gwy.port = s->lan.port; 3611126258Smlaier } 3612126258Smlaier } 3613126258Smlaier s->src.state = PFUDPS_SINGLE; 3614126258Smlaier s->dst.state = PFUDPS_NO_TRAFFIC; 3615126261Smlaier s->creation = time_second; 3616126261Smlaier s->expire = time_second; 3617126258Smlaier s->timeout = PFTM_UDP_FIRST_PACKET; 3618126258Smlaier pf_set_rt_ifp(s, saddr); 3619130613Smlaier if (sn != NULL) { 3620130613Smlaier s->src_node = sn; 3621130613Smlaier s->src_node->states++; 3622130613Smlaier } 3623130613Smlaier if (nsn != NULL) { 3624130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3625130613Smlaier s->nat_src_node = nsn; 3626130613Smlaier s->nat_src_node->states++; 3627130613Smlaier } 3628130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3629145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3630130613Smlaier pf_src_tree_remove_state(s); 3631145836Smlaier STATE_DEC_COUNTERS(s); 3632126258Smlaier pool_put(&pf_state_pl, s); 3633126258Smlaier return (PF_DROP); 3634126258Smlaier } else 3635126258Smlaier *sm = s; 3636145836Smlaier if (tag > 0) { 3637145836Smlaier pf_tag_ref(tag); 3638145836Smlaier s->tag = tag; 3639145836Smlaier } 3640126258Smlaier } 3641126258Smlaier 3642126258Smlaier /* copy back packet headers if we performed NAT operations */ 3643126258Smlaier if (rewrite) 3644126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3645126258Smlaier 3646126258Smlaier return (PF_PASS); 3647126258Smlaier} 3648126258Smlaier 3649126258Smlaierint 3650126258Smlaierpf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 3651130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3652145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3653145836Smlaier struct ifqueue *ifq) 3654126258Smlaier{ 3655130613Smlaier struct pf_rule *nr = NULL; 3656126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3657126258Smlaier struct pf_rule *r, *a = NULL; 3658126258Smlaier struct pf_ruleset *ruleset = NULL; 3659130613Smlaier struct pf_src_node *nsn = NULL; 3660126258Smlaier u_short reason; 3661149893Smlaier u_int16_t icmpid = 0, bport, nport = 0; 3662126258Smlaier sa_family_t af = pd->af; 3663127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 3664127629Smlaier u_int8_t icmpcode = 0; /* make the compiler happy */ 3665126258Smlaier int state_icmp = 0; 3666126258Smlaier struct pf_tag *pftag = NULL; 3667126258Smlaier int tag = -1; 3668126258Smlaier#ifdef INET6 3669126258Smlaier int rewrite = 0; 3670126258Smlaier#endif /* INET6 */ 3671145836Smlaier int asd = 0; 3672126258Smlaier 3673145836Smlaier if (pf_check_congestion(ifq)) { 3674145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3675145836Smlaier return (PF_DROP); 3676145836Smlaier } 3677145836Smlaier 3678126258Smlaier switch (pd->proto) { 3679126258Smlaier#ifdef INET 3680126258Smlaier case IPPROTO_ICMP: 3681126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 3682126258Smlaier icmpcode = pd->hdr.icmp->icmp_code; 3683126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 3684126258Smlaier 3685126258Smlaier if (icmptype == ICMP_UNREACH || 3686126258Smlaier icmptype == ICMP_SOURCEQUENCH || 3687126258Smlaier icmptype == ICMP_REDIRECT || 3688126258Smlaier icmptype == ICMP_TIMXCEED || 3689126258Smlaier icmptype == ICMP_PARAMPROB) 3690126258Smlaier state_icmp++; 3691126258Smlaier break; 3692126258Smlaier#endif /* INET */ 3693126258Smlaier#ifdef INET6 3694126258Smlaier case IPPROTO_ICMPV6: 3695126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 3696126258Smlaier icmpcode = pd->hdr.icmp6->icmp6_code; 3697126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 3698126258Smlaier 3699126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 3700126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 3701126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 3702126258Smlaier icmptype == ICMP6_PARAM_PROB) 3703126258Smlaier state_icmp++; 3704126258Smlaier break; 3705126258Smlaier#endif /* INET6 */ 3706126258Smlaier } 3707126258Smlaier 3708126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3709126258Smlaier 3710126258Smlaier if (direction == PF_OUT) { 3711149884Smlaier bport = nport = icmpid; 3712126258Smlaier /* check outgoing packet for BINAT/NAT */ 3713130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3714149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 3715149884Smlaier NULL) { 3716130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3717126258Smlaier switch (af) { 3718126258Smlaier#ifdef INET 3719126258Smlaier case AF_INET: 3720126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3721130613Smlaier pd->naddr.v4.s_addr, 0); 3722149884Smlaier pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3723149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 3724149884Smlaier pd->hdr.icmp->icmp_id = nport; 3725149893Smlaier m_copyback(m, off, ICMP_MINLEN, 3726149893Smlaier (caddr_t)pd->hdr.icmp); 3727126258Smlaier break; 3728126258Smlaier#endif /* INET */ 3729126258Smlaier#ifdef INET6 3730126258Smlaier case AF_INET6: 3731126258Smlaier pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3732130613Smlaier &pd->naddr, 0); 3733126258Smlaier rewrite++; 3734126258Smlaier break; 3735126258Smlaier#endif /* INET6 */ 3736126258Smlaier } 3737130613Smlaier if (nr->natpass) 3738126258Smlaier r = NULL; 3739130613Smlaier pd->nat_rule = nr; 3740126258Smlaier } 3741126258Smlaier } else { 3742149884Smlaier bport = nport = icmpid; 3743126258Smlaier /* check incoming packet for BINAT/RDR */ 3744130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3745149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 3746149884Smlaier NULL) { 3747130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3748126258Smlaier switch (af) { 3749126258Smlaier#ifdef INET 3750126258Smlaier case AF_INET: 3751126258Smlaier pf_change_a(&daddr->v4.s_addr, 3752130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 3753126258Smlaier break; 3754126258Smlaier#endif /* INET */ 3755126258Smlaier#ifdef INET6 3756126258Smlaier case AF_INET6: 3757126258Smlaier pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3758130613Smlaier &pd->naddr, 0); 3759126258Smlaier rewrite++; 3760126258Smlaier break; 3761126258Smlaier#endif /* INET6 */ 3762126258Smlaier } 3763130613Smlaier if (nr->natpass) 3764126258Smlaier r = NULL; 3765130613Smlaier pd->nat_rule = nr; 3766126258Smlaier } 3767126258Smlaier } 3768126258Smlaier 3769126258Smlaier while (r != NULL) { 3770126258Smlaier r->evaluations++; 3771130613Smlaier if (r->kif != NULL && 3772130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3773126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3774126258Smlaier else if (r->direction && r->direction != direction) 3775126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3776126258Smlaier else if (r->af && r->af != af) 3777126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3778126258Smlaier else if (r->proto && r->proto != pd->proto) 3779126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3780145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg)) 3781126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3782145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg)) 3783126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3784126258Smlaier else if (r->type && r->type != icmptype + 1) 3785126258Smlaier r = TAILQ_NEXT(r, entries); 3786126258Smlaier else if (r->code && r->code != icmpcode + 1) 3787126258Smlaier r = TAILQ_NEXT(r, entries); 3788126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 3789126258Smlaier r = TAILQ_NEXT(r, entries); 3790126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3791126258Smlaier r = TAILQ_NEXT(r, entries); 3792145836Smlaier else if (r->prob && r->prob <= arc4random()) 3793126258Smlaier r = TAILQ_NEXT(r, entries); 3794145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 3795126258Smlaier r = TAILQ_NEXT(r, entries); 3796126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 3797126258Smlaier r = TAILQ_NEXT(r, entries); 3798126258Smlaier else { 3799126258Smlaier if (r->tag) 3800126258Smlaier tag = r->tag; 3801126258Smlaier if (r->anchor == NULL) { 3802126258Smlaier *rm = r; 3803126258Smlaier *am = a; 3804126258Smlaier *rsm = ruleset; 3805126258Smlaier if ((*rm)->quick) 3806126258Smlaier break; 3807126258Smlaier r = TAILQ_NEXT(r, entries); 3808126258Smlaier } else 3809145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3810145836Smlaier PF_RULESET_FILTER, &r, &a); 3811126258Smlaier } 3812145836Smlaier if (r == NULL) 3813145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 3814145836Smlaier PF_RULESET_FILTER, &r, &a); 3815126258Smlaier } 3816126258Smlaier r = *rm; 3817126258Smlaier a = *am; 3818126258Smlaier ruleset = *rsm; 3819126258Smlaier 3820126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3821126258Smlaier 3822126258Smlaier if (r->log) { 3823126258Smlaier#ifdef INET6 3824126258Smlaier if (rewrite) 3825126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 3826126261Smlaier (caddr_t)pd->hdr.icmp6); 3827126258Smlaier#endif /* INET6 */ 3828130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3829126258Smlaier } 3830126258Smlaier 3831126258Smlaier if (r->action != PF_PASS) 3832126258Smlaier return (PF_DROP); 3833126258Smlaier 3834126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 3835126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3836126258Smlaier return (PF_DROP); 3837126258Smlaier } 3838126258Smlaier 3839130613Smlaier if (!state_icmp && (r->keep_state || nr != NULL)) { 3840126258Smlaier /* create new state */ 3841126258Smlaier struct pf_state *s = NULL; 3842130613Smlaier struct pf_src_node *sn = NULL; 3843126258Smlaier 3844130613Smlaier /* check maximums */ 3845145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3846145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3847145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3848130613Smlaier goto cleanup; 3849145836Smlaier } 3850130613Smlaier /* src node for flter rule */ 3851130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3852130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3853145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3854145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3855130613Smlaier goto cleanup; 3856145836Smlaier } 3857130613Smlaier /* src node for translation rule */ 3858130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3859130613Smlaier ((direction == PF_OUT && 3860130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3861145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3862145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3863130613Smlaier goto cleanup; 3864145836Smlaier } 3865130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3866126258Smlaier if (s == NULL) { 3867145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3868130613Smlaiercleanup: 3869130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3870130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3871130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3872130613Smlaier pf_status.src_nodes--; 3873130613Smlaier pool_put(&pf_src_tree_pl, sn); 3874130613Smlaier } 3875130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3876130613Smlaier nsn->expire == 0) { 3877130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3878130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3879130613Smlaier pf_status.src_nodes--; 3880130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3881130613Smlaier } 3882126258Smlaier return (PF_DROP); 3883126258Smlaier } 3884126258Smlaier bzero(s, sizeof(*s)); 3885126258Smlaier s->rule.ptr = r; 3886130613Smlaier s->nat_rule.ptr = nr; 3887126258Smlaier s->anchor.ptr = a; 3888145836Smlaier STATE_INC_COUNTERS(s); 3889126258Smlaier s->allow_opts = r->allow_opts; 3890126258Smlaier s->log = r->log & 2; 3891126258Smlaier s->proto = pd->proto; 3892126258Smlaier s->direction = direction; 3893126258Smlaier s->af = af; 3894126258Smlaier if (direction == PF_OUT) { 3895126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3896149884Smlaier s->gwy.port = nport; 3897126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3898149884Smlaier s->ext.port = 0; 3899149884Smlaier if (nr != NULL) { 3900130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3901149884Smlaier s->lan.port = bport; 3902149884Smlaier } else { 3903126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3904149884Smlaier s->lan.port = s->gwy.port; 3905149884Smlaier } 3906126258Smlaier } else { 3907126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3908149884Smlaier s->lan.port = nport; 3909126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3910149884Smlaier s->ext.port = 0; 3911149884Smlaier if (nr != NULL) { 3912130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3913149884Smlaier s->gwy.port = bport; 3914149884Smlaier } else { 3915126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3916149884Smlaier s->gwy.port = s->lan.port; 3917149884Smlaier } 3918126258Smlaier } 3919126261Smlaier s->creation = time_second; 3920126261Smlaier s->expire = time_second; 3921126258Smlaier s->timeout = PFTM_ICMP_FIRST_PACKET; 3922126258Smlaier pf_set_rt_ifp(s, saddr); 3923130613Smlaier if (sn != NULL) { 3924130613Smlaier s->src_node = sn; 3925130613Smlaier s->src_node->states++; 3926130613Smlaier } 3927130613Smlaier if (nsn != NULL) { 3928130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3929130613Smlaier s->nat_src_node = nsn; 3930130613Smlaier s->nat_src_node->states++; 3931130613Smlaier } 3932130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3933145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3934130613Smlaier pf_src_tree_remove_state(s); 3935145836Smlaier STATE_DEC_COUNTERS(s); 3936126258Smlaier pool_put(&pf_state_pl, s); 3937126258Smlaier return (PF_DROP); 3938126258Smlaier } else 3939126258Smlaier *sm = s; 3940145836Smlaier if (tag > 0) { 3941145836Smlaier pf_tag_ref(tag); 3942145836Smlaier s->tag = tag; 3943145836Smlaier } 3944126258Smlaier } 3945126258Smlaier 3946126258Smlaier#ifdef INET6 3947126258Smlaier /* copy back packet headers if we performed IPv6 NAT operations */ 3948126258Smlaier if (rewrite) 3949126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 3950126261Smlaier (caddr_t)pd->hdr.icmp6); 3951126258Smlaier#endif /* INET6 */ 3952126258Smlaier 3953126258Smlaier return (PF_PASS); 3954126258Smlaier} 3955126258Smlaier 3956126258Smlaierint 3957126258Smlaierpf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 3958130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3959145836Smlaier struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 3960126258Smlaier{ 3961130613Smlaier struct pf_rule *nr = NULL; 3962126258Smlaier struct pf_rule *r, *a = NULL; 3963126258Smlaier struct pf_ruleset *ruleset = NULL; 3964130613Smlaier struct pf_src_node *nsn = NULL; 3965126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3966126258Smlaier sa_family_t af = pd->af; 3967126258Smlaier u_short reason; 3968126258Smlaier struct pf_tag *pftag = NULL; 3969126258Smlaier int tag = -1; 3970145836Smlaier int asd = 0; 3971126258Smlaier 3972145836Smlaier if (pf_check_congestion(ifq)) { 3973145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3974145836Smlaier return (PF_DROP); 3975145836Smlaier } 3976145836Smlaier 3977126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3978126258Smlaier 3979126258Smlaier if (direction == PF_OUT) { 3980126258Smlaier /* check outgoing packet for BINAT/NAT */ 3981130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3982130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 3983130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3984126258Smlaier switch (af) { 3985126258Smlaier#ifdef INET 3986126258Smlaier case AF_INET: 3987126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3988130613Smlaier pd->naddr.v4.s_addr, 0); 3989126258Smlaier break; 3990126258Smlaier#endif /* INET */ 3991126258Smlaier#ifdef INET6 3992126258Smlaier case AF_INET6: 3993130613Smlaier PF_ACPY(saddr, &pd->naddr, af); 3994126258Smlaier break; 3995126258Smlaier#endif /* INET6 */ 3996126258Smlaier } 3997130613Smlaier if (nr->natpass) 3998126258Smlaier r = NULL; 3999130613Smlaier pd->nat_rule = nr; 4000126258Smlaier } 4001126258Smlaier } else { 4002126258Smlaier /* check incoming packet for BINAT/RDR */ 4003130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4004130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4005130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 4006126258Smlaier switch (af) { 4007126258Smlaier#ifdef INET 4008126258Smlaier case AF_INET: 4009126258Smlaier pf_change_a(&daddr->v4.s_addr, 4010130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 4011126258Smlaier break; 4012126258Smlaier#endif /* INET */ 4013126258Smlaier#ifdef INET6 4014126258Smlaier case AF_INET6: 4015130613Smlaier PF_ACPY(daddr, &pd->naddr, af); 4016126258Smlaier break; 4017126258Smlaier#endif /* INET6 */ 4018126258Smlaier } 4019130613Smlaier if (nr->natpass) 4020126258Smlaier r = NULL; 4021130613Smlaier pd->nat_rule = nr; 4022126258Smlaier } 4023126258Smlaier } 4024126258Smlaier 4025126258Smlaier while (r != NULL) { 4026126258Smlaier r->evaluations++; 4027130613Smlaier if (r->kif != NULL && 4028130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 4029126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4030126258Smlaier else if (r->direction && r->direction != direction) 4031126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4032126258Smlaier else if (r->af && r->af != af) 4033126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4034126258Smlaier else if (r->proto && r->proto != pd->proto) 4035126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4036145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg)) 4037126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4038145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg)) 4039126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4040126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 4041126258Smlaier r = TAILQ_NEXT(r, entries); 4042126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 4043126258Smlaier r = TAILQ_NEXT(r, entries); 4044145836Smlaier else if (r->prob && r->prob <= arc4random()) 4045126258Smlaier r = TAILQ_NEXT(r, entries); 4046145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 4047126258Smlaier r = TAILQ_NEXT(r, entries); 4048126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4049126258Smlaier r = TAILQ_NEXT(r, entries); 4050126258Smlaier else { 4051126258Smlaier if (r->tag) 4052126258Smlaier tag = r->tag; 4053126258Smlaier if (r->anchor == NULL) { 4054126258Smlaier *rm = r; 4055126258Smlaier *am = a; 4056126258Smlaier *rsm = ruleset; 4057126258Smlaier if ((*rm)->quick) 4058126258Smlaier break; 4059126258Smlaier r = TAILQ_NEXT(r, entries); 4060126258Smlaier } else 4061145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4062145836Smlaier PF_RULESET_FILTER, &r, &a); 4063126258Smlaier } 4064145836Smlaier if (r == NULL) 4065145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 4066145836Smlaier PF_RULESET_FILTER, &r, &a); 4067126258Smlaier } 4068126258Smlaier r = *rm; 4069126258Smlaier a = *am; 4070126258Smlaier ruleset = *rsm; 4071126258Smlaier 4072126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4073130613Smlaier 4074126258Smlaier if (r->log) 4075130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 4076126258Smlaier 4077126258Smlaier if ((r->action == PF_DROP) && 4078126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 4079126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 4080126258Smlaier struct pf_addr *a = NULL; 4081126258Smlaier 4082130613Smlaier if (nr != NULL) { 4083130613Smlaier if (direction == PF_OUT) 4084130613Smlaier a = saddr; 4085130613Smlaier else 4086130613Smlaier a = daddr; 4087130613Smlaier } 4088126258Smlaier if (a != NULL) { 4089126258Smlaier switch (af) { 4090126258Smlaier#ifdef INET 4091126258Smlaier case AF_INET: 4092126258Smlaier pf_change_a(&a->v4.s_addr, pd->ip_sum, 4093130613Smlaier pd->baddr.v4.s_addr, 0); 4094126258Smlaier break; 4095126258Smlaier#endif /* INET */ 4096126258Smlaier#ifdef INET6 4097126258Smlaier case AF_INET6: 4098130613Smlaier PF_ACPY(a, &pd->baddr, af); 4099126258Smlaier break; 4100126258Smlaier#endif /* INET6 */ 4101126258Smlaier } 4102126258Smlaier } 4103126258Smlaier if ((af == AF_INET) && r->return_icmp) 4104126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 4105126258Smlaier r->return_icmp & 255, af, r); 4106126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 4107126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 4108126258Smlaier r->return_icmp6 & 255, af, r); 4109126258Smlaier } 4110126258Smlaier 4111126258Smlaier if (r->action != PF_PASS) 4112126258Smlaier return (PF_DROP); 4113126258Smlaier 4114126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 4115126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4116126258Smlaier return (PF_DROP); 4117126258Smlaier } 4118126258Smlaier 4119130613Smlaier if (r->keep_state || nr != NULL) { 4120126258Smlaier /* create new state */ 4121126258Smlaier struct pf_state *s = NULL; 4122130613Smlaier struct pf_src_node *sn = NULL; 4123126258Smlaier 4124130613Smlaier /* check maximums */ 4125145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 4126145836Smlaier pf_status.lcounters[LCNT_STATES]++; 4127145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 4128130613Smlaier goto cleanup; 4129145836Smlaier } 4130130613Smlaier /* src node for flter rule */ 4131130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 4132130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 4133145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 4134145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4135130613Smlaier goto cleanup; 4136145836Smlaier } 4137130613Smlaier /* src node for translation rule */ 4138130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4139130613Smlaier ((direction == PF_OUT && 4140130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4141145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4142145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4143130613Smlaier goto cleanup; 4144145836Smlaier } 4145130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 4146126258Smlaier if (s == NULL) { 4147145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 4148130613Smlaiercleanup: 4149130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4150130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4151130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4152130613Smlaier pf_status.src_nodes--; 4153130613Smlaier pool_put(&pf_src_tree_pl, sn); 4154130613Smlaier } 4155130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 4156130613Smlaier nsn->expire == 0) { 4157130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4158130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4159130613Smlaier pf_status.src_nodes--; 4160130613Smlaier pool_put(&pf_src_tree_pl, nsn); 4161130613Smlaier } 4162126258Smlaier return (PF_DROP); 4163126258Smlaier } 4164126258Smlaier bzero(s, sizeof(*s)); 4165126258Smlaier s->rule.ptr = r; 4166130613Smlaier s->nat_rule.ptr = nr; 4167126258Smlaier s->anchor.ptr = a; 4168145836Smlaier STATE_INC_COUNTERS(s); 4169126258Smlaier s->allow_opts = r->allow_opts; 4170126258Smlaier s->log = r->log & 2; 4171126258Smlaier s->proto = pd->proto; 4172126258Smlaier s->direction = direction; 4173126258Smlaier s->af = af; 4174126258Smlaier if (direction == PF_OUT) { 4175126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 4176126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 4177130613Smlaier if (nr != NULL) 4178130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 4179126258Smlaier else 4180126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4181126258Smlaier } else { 4182126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 4183126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 4184130613Smlaier if (nr != NULL) 4185130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4186126258Smlaier else 4187126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4188126258Smlaier } 4189126258Smlaier s->src.state = PFOTHERS_SINGLE; 4190126258Smlaier s->dst.state = PFOTHERS_NO_TRAFFIC; 4191126261Smlaier s->creation = time_second; 4192126261Smlaier s->expire = time_second; 4193126258Smlaier s->timeout = PFTM_OTHER_FIRST_PACKET; 4194126258Smlaier pf_set_rt_ifp(s, saddr); 4195130613Smlaier if (sn != NULL) { 4196130613Smlaier s->src_node = sn; 4197130613Smlaier s->src_node->states++; 4198130613Smlaier } 4199130613Smlaier if (nsn != NULL) { 4200130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 4201130613Smlaier s->nat_src_node = nsn; 4202130613Smlaier s->nat_src_node->states++; 4203130613Smlaier } 4204130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4205145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 4206130613Smlaier pf_src_tree_remove_state(s); 4207145836Smlaier STATE_DEC_COUNTERS(s); 4208126258Smlaier pool_put(&pf_state_pl, s); 4209126258Smlaier return (PF_DROP); 4210126258Smlaier } else 4211126258Smlaier *sm = s; 4212145836Smlaier if (tag > 0) { 4213145836Smlaier pf_tag_ref(tag); 4214145836Smlaier s->tag = tag; 4215145836Smlaier } 4216126258Smlaier } 4217126258Smlaier 4218126258Smlaier return (PF_PASS); 4219126258Smlaier} 4220126258Smlaier 4221126258Smlaierint 4222130613Smlaierpf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4223126258Smlaier struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4224126258Smlaier struct pf_ruleset **rsm) 4225126258Smlaier{ 4226126258Smlaier struct pf_rule *r, *a = NULL; 4227126258Smlaier struct pf_ruleset *ruleset = NULL; 4228126258Smlaier sa_family_t af = pd->af; 4229126258Smlaier u_short reason; 4230126258Smlaier struct pf_tag *pftag = NULL; 4231126258Smlaier int tag = -1; 4232145836Smlaier int asd = 0; 4233126258Smlaier 4234126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4235126258Smlaier while (r != NULL) { 4236126258Smlaier r->evaluations++; 4237130613Smlaier if (r->kif != NULL && 4238130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 4239126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4240126258Smlaier else if (r->direction && r->direction != direction) 4241126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4242126258Smlaier else if (r->af && r->af != af) 4243126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4244126258Smlaier else if (r->proto && r->proto != pd->proto) 4245126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4246145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg)) 4247126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4248145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg)) 4249126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4250126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 4251126258Smlaier r = TAILQ_NEXT(r, entries); 4252126258Smlaier else if (r->src.port_op || r->dst.port_op || 4253126258Smlaier r->flagset || r->type || r->code || 4254126258Smlaier r->os_fingerprint != PF_OSFP_ANY) 4255126258Smlaier r = TAILQ_NEXT(r, entries); 4256145836Smlaier else if (r->prob && r->prob <= arc4random()) 4257126258Smlaier r = TAILQ_NEXT(r, entries); 4258145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 4259126258Smlaier r = TAILQ_NEXT(r, entries); 4260126258Smlaier else { 4261126258Smlaier if (r->anchor == NULL) { 4262126258Smlaier *rm = r; 4263126258Smlaier *am = a; 4264126258Smlaier *rsm = ruleset; 4265126258Smlaier if ((*rm)->quick) 4266126258Smlaier break; 4267126258Smlaier r = TAILQ_NEXT(r, entries); 4268126258Smlaier } else 4269145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4270145836Smlaier PF_RULESET_FILTER, &r, &a); 4271126258Smlaier } 4272145836Smlaier if (r == NULL) 4273145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 4274145836Smlaier PF_RULESET_FILTER, &r, &a); 4275126258Smlaier } 4276126258Smlaier r = *rm; 4277126258Smlaier a = *am; 4278126258Smlaier ruleset = *rsm; 4279126258Smlaier 4280126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4281130613Smlaier 4282126258Smlaier if (r->log) 4283130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 4284126258Smlaier 4285126258Smlaier if (r->action != PF_PASS) 4286126258Smlaier return (PF_DROP); 4287126258Smlaier 4288126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 4289126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4290126258Smlaier return (PF_DROP); 4291126258Smlaier } 4292126258Smlaier 4293126258Smlaier return (PF_PASS); 4294126258Smlaier} 4295126258Smlaier 4296126258Smlaierint 4297130613Smlaierpf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4298130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4299126258Smlaier u_short *reason) 4300126258Smlaier{ 4301130613Smlaier struct pf_state key; 4302126258Smlaier struct tcphdr *th = pd->hdr.tcp; 4303126258Smlaier u_int16_t win = ntohs(th->th_win); 4304145836Smlaier u_int32_t ack, end, seq, orig_seq; 4305126258Smlaier u_int8_t sws, dws; 4306130613Smlaier int ackskew; 4307126258Smlaier int copyback = 0; 4308126258Smlaier struct pf_state_peer *src, *dst; 4309126258Smlaier 4310126258Smlaier key.af = pd->af; 4311126258Smlaier key.proto = IPPROTO_TCP; 4312130613Smlaier if (direction == PF_IN) { 4313130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 4314130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4315130613Smlaier key.ext.port = th->th_sport; 4316130613Smlaier key.gwy.port = th->th_dport; 4317130613Smlaier } else { 4318130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 4319130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 4320130613Smlaier key.lan.port = th->th_sport; 4321130613Smlaier key.ext.port = th->th_dport; 4322130613Smlaier } 4323126258Smlaier 4324126258Smlaier STATE_LOOKUP(); 4325126258Smlaier 4326126258Smlaier if (direction == (*state)->direction) { 4327126258Smlaier src = &(*state)->src; 4328126258Smlaier dst = &(*state)->dst; 4329126258Smlaier } else { 4330126258Smlaier src = &(*state)->dst; 4331126258Smlaier dst = &(*state)->src; 4332126258Smlaier } 4333126258Smlaier 4334126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4335145836Smlaier if (direction != (*state)->direction) { 4336145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4337126258Smlaier return (PF_SYNPROXY_DROP); 4338145836Smlaier } 4339126258Smlaier if (th->th_flags & TH_SYN) { 4340145836Smlaier if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4341145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4342126258Smlaier return (PF_DROP); 4343145836Smlaier } 4344126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4345126258Smlaier pd->src, th->th_dport, th->th_sport, 4346126258Smlaier (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4347145836Smlaier TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4348145836Smlaier NULL, NULL); 4349145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4350126258Smlaier return (PF_SYNPROXY_DROP); 4351126258Smlaier } else if (!(th->th_flags & TH_ACK) || 4352126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4353145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4354145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4355126258Smlaier return (PF_DROP); 4356145836Smlaier } else if ((*state)->src_node != NULL && 4357145836Smlaier pf_src_connlimit(state)) { 4358145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4359145836Smlaier return (PF_DROP); 4360145836Smlaier } else 4361126258Smlaier (*state)->src.state = PF_TCPS_PROXY_DST; 4362126258Smlaier } 4363126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4364126258Smlaier struct pf_state_host *src, *dst; 4365126258Smlaier 4366126258Smlaier if (direction == PF_OUT) { 4367126258Smlaier src = &(*state)->gwy; 4368126258Smlaier dst = &(*state)->ext; 4369126258Smlaier } else { 4370126258Smlaier src = &(*state)->ext; 4371126258Smlaier dst = &(*state)->lan; 4372126258Smlaier } 4373126258Smlaier if (direction == (*state)->direction) { 4374126258Smlaier if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4375126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4376145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4377145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4378126258Smlaier return (PF_DROP); 4379145836Smlaier } 4380126258Smlaier (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4381126258Smlaier if ((*state)->dst.seqhi == 1) 4382145836Smlaier (*state)->dst.seqhi = htonl(arc4random()); 4383126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4384126258Smlaier &dst->addr, src->port, dst->port, 4385130613Smlaier (*state)->dst.seqhi, 0, TH_SYN, 0, 4386145836Smlaier (*state)->src.mss, 0, 0, NULL, NULL); 4387145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4388126258Smlaier return (PF_SYNPROXY_DROP); 4389126258Smlaier } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4390126258Smlaier (TH_SYN|TH_ACK)) || 4391145836Smlaier (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4392145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4393126258Smlaier return (PF_DROP); 4394145836Smlaier } else { 4395126258Smlaier (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4396126258Smlaier (*state)->dst.seqlo = ntohl(th->th_seq); 4397126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4398126258Smlaier pd->src, th->th_dport, th->th_sport, 4399126258Smlaier ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4400145836Smlaier TH_ACK, (*state)->src.max_win, 0, 0, 0, 4401145836Smlaier NULL, NULL); 4402126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4403126258Smlaier &dst->addr, src->port, dst->port, 4404126258Smlaier (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4405145836Smlaier TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4406145836Smlaier NULL, NULL); 4407126258Smlaier (*state)->src.seqdiff = (*state)->dst.seqhi - 4408126258Smlaier (*state)->src.seqlo; 4409126258Smlaier (*state)->dst.seqdiff = (*state)->src.seqhi - 4410126258Smlaier (*state)->dst.seqlo; 4411126258Smlaier (*state)->src.seqhi = (*state)->src.seqlo + 4412145875Smlaier (*state)->dst.max_win; 4413145875Smlaier (*state)->dst.seqhi = (*state)->dst.seqlo + 4414145836Smlaier (*state)->src.max_win; 4415126258Smlaier (*state)->src.wscale = (*state)->dst.wscale = 0; 4416126258Smlaier (*state)->src.state = (*state)->dst.state = 4417126258Smlaier TCPS_ESTABLISHED; 4418145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4419126258Smlaier return (PF_SYNPROXY_DROP); 4420126258Smlaier } 4421126258Smlaier } 4422126258Smlaier 4423126258Smlaier if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4424126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4425126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4426126258Smlaier } else 4427126258Smlaier sws = dws = 0; 4428126258Smlaier 4429126258Smlaier /* 4430126258Smlaier * Sequence tracking algorithm from Guido van Rooij's paper: 4431126258Smlaier * http://www.madison-gurkha.com/publications/tcp_filtering/ 4432126258Smlaier * tcp_filtering.ps 4433126258Smlaier */ 4434126258Smlaier 4435145836Smlaier orig_seq = seq = ntohl(th->th_seq); 4436126258Smlaier if (src->seqlo == 0) { 4437126258Smlaier /* First packet from this end. Set its state */ 4438126258Smlaier 4439126258Smlaier if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4440126258Smlaier src->scrub == NULL) { 4441126258Smlaier if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4442126258Smlaier REASON_SET(reason, PFRES_MEMORY); 4443126258Smlaier return (PF_DROP); 4444126258Smlaier } 4445126258Smlaier } 4446126258Smlaier 4447126258Smlaier /* Deferred generation of sequence number modulator */ 4448126258Smlaier if (dst->seqdiff && !src->seqdiff) { 4449145836Smlaier while ((src->seqdiff = htonl(arc4random())) == 0) 4450126258Smlaier ; 4451126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4452126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4453126258Smlaier src->seqdiff), 0); 4454126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4455126258Smlaier copyback = 1; 4456126258Smlaier } else { 4457126258Smlaier ack = ntohl(th->th_ack); 4458126258Smlaier } 4459126258Smlaier 4460126258Smlaier end = seq + pd->p_len; 4461126258Smlaier if (th->th_flags & TH_SYN) { 4462126258Smlaier end++; 4463126258Smlaier if (dst->wscale & PF_WSCALE_FLAG) { 4464126258Smlaier src->wscale = pf_get_wscale(m, off, th->th_off, 4465126258Smlaier pd->af); 4466126258Smlaier if (src->wscale & PF_WSCALE_FLAG) { 4467126258Smlaier /* Remove scale factor from initial 4468126258Smlaier * window */ 4469126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4470126258Smlaier win = ((u_int32_t)win + (1 << sws) - 1) 4471126258Smlaier >> sws; 4472126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4473126258Smlaier } else { 4474126258Smlaier /* fixup other window */ 4475126258Smlaier dst->max_win <<= dst->wscale & 4476126258Smlaier PF_WSCALE_MASK; 4477126258Smlaier /* in case of a retrans SYN|ACK */ 4478126258Smlaier dst->wscale = 0; 4479126258Smlaier } 4480126258Smlaier } 4481126258Smlaier } 4482126258Smlaier if (th->th_flags & TH_FIN) 4483126258Smlaier end++; 4484126258Smlaier 4485126258Smlaier src->seqlo = seq; 4486126258Smlaier if (src->state < TCPS_SYN_SENT) 4487126258Smlaier src->state = TCPS_SYN_SENT; 4488126258Smlaier 4489126258Smlaier /* 4490126258Smlaier * May need to slide the window (seqhi may have been set by 4491126258Smlaier * the crappy stack check or if we picked up the connection 4492126258Smlaier * after establishment) 4493126258Smlaier */ 4494126258Smlaier if (src->seqhi == 1 || 4495126258Smlaier SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4496126258Smlaier src->seqhi = end + MAX(1, dst->max_win << dws); 4497126258Smlaier if (win > src->max_win) 4498126258Smlaier src->max_win = win; 4499126258Smlaier 4500126258Smlaier } else { 4501126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4502126258Smlaier if (src->seqdiff) { 4503126258Smlaier /* Modulate sequence numbers */ 4504126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4505126258Smlaier src->seqdiff), 0); 4506126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4507126258Smlaier copyback = 1; 4508126258Smlaier } 4509126258Smlaier end = seq + pd->p_len; 4510126258Smlaier if (th->th_flags & TH_SYN) 4511126258Smlaier end++; 4512126258Smlaier if (th->th_flags & TH_FIN) 4513126258Smlaier end++; 4514126258Smlaier } 4515126258Smlaier 4516126258Smlaier if ((th->th_flags & TH_ACK) == 0) { 4517126258Smlaier /* Let it pass through the ack skew check */ 4518126258Smlaier ack = dst->seqlo; 4519126258Smlaier } else if ((ack == 0 && 4520126258Smlaier (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4521126258Smlaier /* broken tcp stacks do not set ack */ 4522126258Smlaier (dst->state < TCPS_SYN_SENT)) { 4523126258Smlaier /* 4524126258Smlaier * Many stacks (ours included) will set the ACK number in an 4525126258Smlaier * FIN|ACK if the SYN times out -- no sequence to ACK. 4526126258Smlaier */ 4527126258Smlaier ack = dst->seqlo; 4528126258Smlaier } 4529126258Smlaier 4530126258Smlaier if (seq == end) { 4531126258Smlaier /* Ease sequencing restrictions on no data packets */ 4532126258Smlaier seq = src->seqlo; 4533126258Smlaier end = seq; 4534126258Smlaier } 4535126258Smlaier 4536126258Smlaier ackskew = dst->seqlo - ack; 4537126258Smlaier 4538126258Smlaier#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4539126258Smlaier if (SEQ_GEQ(src->seqhi, end) && 4540126258Smlaier /* Last octet inside other's window space */ 4541126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4542126258Smlaier /* Retrans: not more than one window back */ 4543126258Smlaier (ackskew >= -MAXACKWINDOW) && 4544126258Smlaier /* Acking not more than one reassembled fragment backwards */ 4545145836Smlaier (ackskew <= (MAXACKWINDOW << sws)) && 4546126258Smlaier /* Acking not more than one window forward */ 4547145836Smlaier ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4548145836Smlaier (pd->flags & PFDESC_IP_REAS) == 0)) { 4549145836Smlaier /* Require an exact sequence match on resets when possible */ 4550126258Smlaier 4551145836Smlaier if (dst->scrub || src->scrub) { 4552145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4553145836Smlaier *state, src, dst, ©back)) 4554145836Smlaier return (PF_DROP); 4555145836Smlaier } 4556145836Smlaier 4557126258Smlaier /* update max window */ 4558126258Smlaier if (src->max_win < win) 4559126258Smlaier src->max_win = win; 4560126258Smlaier /* synchronize sequencing */ 4561126258Smlaier if (SEQ_GT(end, src->seqlo)) 4562126258Smlaier src->seqlo = end; 4563126258Smlaier /* slide the window of what the other end can send */ 4564126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4565126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 4566126258Smlaier 4567126258Smlaier 4568126258Smlaier /* update states */ 4569126258Smlaier if (th->th_flags & TH_SYN) 4570126258Smlaier if (src->state < TCPS_SYN_SENT) 4571126258Smlaier src->state = TCPS_SYN_SENT; 4572126258Smlaier if (th->th_flags & TH_FIN) 4573126258Smlaier if (src->state < TCPS_CLOSING) 4574126258Smlaier src->state = TCPS_CLOSING; 4575126258Smlaier if (th->th_flags & TH_ACK) { 4576145836Smlaier if (dst->state == TCPS_SYN_SENT) { 4577126258Smlaier dst->state = TCPS_ESTABLISHED; 4578145836Smlaier if (src->state == TCPS_ESTABLISHED && 4579145836Smlaier (*state)->src_node != NULL && 4580145836Smlaier pf_src_connlimit(state)) { 4581145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4582145836Smlaier return (PF_DROP); 4583145836Smlaier } 4584145836Smlaier } else if (dst->state == TCPS_CLOSING) 4585126258Smlaier dst->state = TCPS_FIN_WAIT_2; 4586126258Smlaier } 4587126258Smlaier if (th->th_flags & TH_RST) 4588126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 4589126258Smlaier 4590126258Smlaier /* update expire time */ 4591126261Smlaier (*state)->expire = time_second; 4592126258Smlaier if (src->state >= TCPS_FIN_WAIT_2 && 4593126258Smlaier dst->state >= TCPS_FIN_WAIT_2) 4594126258Smlaier (*state)->timeout = PFTM_TCP_CLOSED; 4595126258Smlaier else if (src->state >= TCPS_FIN_WAIT_2 || 4596126258Smlaier dst->state >= TCPS_FIN_WAIT_2) 4597126258Smlaier (*state)->timeout = PFTM_TCP_FIN_WAIT; 4598126258Smlaier else if (src->state < TCPS_ESTABLISHED || 4599126258Smlaier dst->state < TCPS_ESTABLISHED) 4600126258Smlaier (*state)->timeout = PFTM_TCP_OPENING; 4601126258Smlaier else if (src->state >= TCPS_CLOSING || 4602126258Smlaier dst->state >= TCPS_CLOSING) 4603126258Smlaier (*state)->timeout = PFTM_TCP_CLOSING; 4604126258Smlaier else 4605126258Smlaier (*state)->timeout = PFTM_TCP_ESTABLISHED; 4606126258Smlaier 4607126258Smlaier /* Fall through to PASS packet */ 4608126258Smlaier 4609126258Smlaier } else if ((dst->state < TCPS_SYN_SENT || 4610126258Smlaier dst->state >= TCPS_FIN_WAIT_2 || 4611126258Smlaier src->state >= TCPS_FIN_WAIT_2) && 4612126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4613126258Smlaier /* Within a window forward of the originating packet */ 4614126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4615126258Smlaier /* Within a window backward of the originating packet */ 4616126258Smlaier 4617126258Smlaier /* 4618126258Smlaier * This currently handles three situations: 4619126258Smlaier * 1) Stupid stacks will shotgun SYNs before their peer 4620126258Smlaier * replies. 4621126258Smlaier * 2) When PF catches an already established stream (the 4622126258Smlaier * firewall rebooted, the state table was flushed, routes 4623126258Smlaier * changed...) 4624126258Smlaier * 3) Packets get funky immediately after the connection 4625126258Smlaier * closes (this should catch Solaris spurious ACK|FINs 4626126258Smlaier * that web servers like to spew after a close) 4627126258Smlaier * 4628126258Smlaier * This must be a little more careful than the above code 4629126258Smlaier * since packet floods will also be caught here. We don't 4630126258Smlaier * update the TTL here to mitigate the damage of a packet 4631126258Smlaier * flood and so the same code can handle awkward establishment 4632126258Smlaier * and a loosened connection close. 4633126258Smlaier * In the establishment case, a correct peer response will 4634126258Smlaier * validate the connection, go through the normal state code 4635126258Smlaier * and keep updating the state TTL. 4636126258Smlaier */ 4637126258Smlaier 4638126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 4639126258Smlaier printf("pf: loose state match: "); 4640126258Smlaier pf_print_state(*state); 4641126258Smlaier pf_print_flags(th->th_flags); 4642126258Smlaier printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n", 4643126258Smlaier seq, ack, pd->p_len, ackskew, 4644126258Smlaier (*state)->packets[0], (*state)->packets[1]); 4645126258Smlaier } 4646126258Smlaier 4647145836Smlaier if (dst->scrub || src->scrub) { 4648145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4649145836Smlaier *state, src, dst, ©back)) 4650145836Smlaier return (PF_DROP); 4651145836Smlaier } 4652145836Smlaier 4653126258Smlaier /* update max window */ 4654126258Smlaier if (src->max_win < win) 4655126258Smlaier src->max_win = win; 4656126258Smlaier /* synchronize sequencing */ 4657126258Smlaier if (SEQ_GT(end, src->seqlo)) 4658126258Smlaier src->seqlo = end; 4659126258Smlaier /* slide the window of what the other end can send */ 4660126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4661126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 4662126258Smlaier 4663126258Smlaier /* 4664126258Smlaier * Cannot set dst->seqhi here since this could be a shotgunned 4665126258Smlaier * SYN and not an already established connection. 4666126258Smlaier */ 4667126258Smlaier 4668126258Smlaier if (th->th_flags & TH_FIN) 4669126258Smlaier if (src->state < TCPS_CLOSING) 4670126258Smlaier src->state = TCPS_CLOSING; 4671126258Smlaier if (th->th_flags & TH_RST) 4672126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 4673126258Smlaier 4674126258Smlaier /* Fall through to PASS packet */ 4675126258Smlaier 4676126258Smlaier } else { 4677126258Smlaier if ((*state)->dst.state == TCPS_SYN_SENT && 4678126258Smlaier (*state)->src.state == TCPS_SYN_SENT) { 4679126258Smlaier /* Send RST for state mismatches during handshake */ 4680145836Smlaier if (!(th->th_flags & TH_RST)) 4681126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, 4682126258Smlaier pd->dst, pd->src, th->th_dport, 4683145836Smlaier th->th_sport, ntohl(th->th_ack), 0, 4684145836Smlaier TH_RST, 0, 0, 4685145836Smlaier (*state)->rule.ptr->return_ttl, 1, 4686145836Smlaier pd->eh, kif->pfik_ifp); 4687126258Smlaier src->seqlo = 0; 4688126258Smlaier src->seqhi = 1; 4689126258Smlaier src->max_win = 1; 4690126258Smlaier } else if (pf_status.debug >= PF_DEBUG_MISC) { 4691126258Smlaier printf("pf: BAD state: "); 4692126258Smlaier pf_print_state(*state); 4693126258Smlaier pf_print_flags(th->th_flags); 4694126258Smlaier printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d " 4695126258Smlaier "dir=%s,%s\n", seq, ack, pd->p_len, ackskew, 4696126258Smlaier (*state)->packets[0], (*state)->packets[1], 4697126258Smlaier direction == PF_IN ? "in" : "out", 4698126258Smlaier direction == (*state)->direction ? "fwd" : "rev"); 4699126258Smlaier printf("pf: State failure on: %c %c %c %c | %c %c\n", 4700126258Smlaier SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4701126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4702126258Smlaier ' ': '2', 4703126258Smlaier (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4704126258Smlaier (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4705126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4706126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4707126258Smlaier } 4708145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 4709126258Smlaier return (PF_DROP); 4710126258Smlaier } 4711126258Smlaier 4712126258Smlaier /* Any packets which have gotten here are to be passed */ 4713126258Smlaier 4714126258Smlaier /* translate source/destination address, if necessary */ 4715126258Smlaier if (STATE_TRANSLATE(*state)) { 4716126258Smlaier if (direction == PF_OUT) 4717126258Smlaier pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4718126258Smlaier &th->th_sum, &(*state)->gwy.addr, 4719126258Smlaier (*state)->gwy.port, 0, pd->af); 4720126258Smlaier else 4721126258Smlaier pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4722126258Smlaier &th->th_sum, &(*state)->lan.addr, 4723126258Smlaier (*state)->lan.port, 0, pd->af); 4724126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 4725126258Smlaier } else if (copyback) { 4726126258Smlaier /* Copyback sequence modulation or stateful scrub changes */ 4727126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 4728126258Smlaier } 4729126258Smlaier 4730126258Smlaier return (PF_PASS); 4731126258Smlaier} 4732126258Smlaier 4733126258Smlaierint 4734130613Smlaierpf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4735130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4736126258Smlaier{ 4737126258Smlaier struct pf_state_peer *src, *dst; 4738130613Smlaier struct pf_state key; 4739126258Smlaier struct udphdr *uh = pd->hdr.udp; 4740126258Smlaier 4741126258Smlaier key.af = pd->af; 4742126258Smlaier key.proto = IPPROTO_UDP; 4743130613Smlaier if (direction == PF_IN) { 4744130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 4745130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4746130613Smlaier key.ext.port = uh->uh_sport; 4747130613Smlaier key.gwy.port = uh->uh_dport; 4748130613Smlaier } else { 4749130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 4750130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 4751130613Smlaier key.lan.port = uh->uh_sport; 4752130613Smlaier key.ext.port = uh->uh_dport; 4753130613Smlaier } 4754126258Smlaier 4755126258Smlaier STATE_LOOKUP(); 4756126258Smlaier 4757126258Smlaier if (direction == (*state)->direction) { 4758126258Smlaier src = &(*state)->src; 4759126258Smlaier dst = &(*state)->dst; 4760126258Smlaier } else { 4761126258Smlaier src = &(*state)->dst; 4762126258Smlaier dst = &(*state)->src; 4763126258Smlaier } 4764126258Smlaier 4765126258Smlaier /* update states */ 4766126258Smlaier if (src->state < PFUDPS_SINGLE) 4767126258Smlaier src->state = PFUDPS_SINGLE; 4768126258Smlaier if (dst->state == PFUDPS_SINGLE) 4769126258Smlaier dst->state = PFUDPS_MULTIPLE; 4770126258Smlaier 4771126258Smlaier /* update expire time */ 4772126261Smlaier (*state)->expire = time_second; 4773126258Smlaier if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4774126258Smlaier (*state)->timeout = PFTM_UDP_MULTIPLE; 4775126258Smlaier else 4776126258Smlaier (*state)->timeout = PFTM_UDP_SINGLE; 4777126258Smlaier 4778126258Smlaier /* translate source/destination address, if necessary */ 4779126258Smlaier if (STATE_TRANSLATE(*state)) { 4780126258Smlaier if (direction == PF_OUT) 4781126258Smlaier pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4782126258Smlaier &uh->uh_sum, &(*state)->gwy.addr, 4783126258Smlaier (*state)->gwy.port, 1, pd->af); 4784126258Smlaier else 4785126258Smlaier pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4786126258Smlaier &uh->uh_sum, &(*state)->lan.addr, 4787126258Smlaier (*state)->lan.port, 1, pd->af); 4788126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4789126258Smlaier } 4790126258Smlaier 4791126258Smlaier return (PF_PASS); 4792126258Smlaier} 4793126258Smlaier 4794126258Smlaierint 4795130613Smlaierpf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4796145836Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4797126258Smlaier{ 4798126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4799127629Smlaier u_int16_t icmpid = 0; /* make the compiler happy */ 4800127629Smlaier u_int16_t *icmpsum = NULL; /* make the compiler happy */ 4801127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 4802130613Smlaier int state_icmp = 0; 4803126258Smlaier 4804126258Smlaier switch (pd->proto) { 4805126258Smlaier#ifdef INET 4806126258Smlaier case IPPROTO_ICMP: 4807126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 4808126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 4809126258Smlaier icmpsum = &pd->hdr.icmp->icmp_cksum; 4810126258Smlaier 4811126258Smlaier if (icmptype == ICMP_UNREACH || 4812126258Smlaier icmptype == ICMP_SOURCEQUENCH || 4813126258Smlaier icmptype == ICMP_REDIRECT || 4814126258Smlaier icmptype == ICMP_TIMXCEED || 4815126258Smlaier icmptype == ICMP_PARAMPROB) 4816126258Smlaier state_icmp++; 4817126258Smlaier break; 4818126258Smlaier#endif /* INET */ 4819126258Smlaier#ifdef INET6 4820126258Smlaier case IPPROTO_ICMPV6: 4821126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 4822126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 4823126258Smlaier icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4824126258Smlaier 4825126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 4826126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 4827126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 4828126258Smlaier icmptype == ICMP6_PARAM_PROB) 4829126258Smlaier state_icmp++; 4830126258Smlaier break; 4831126258Smlaier#endif /* INET6 */ 4832126258Smlaier } 4833126258Smlaier 4834126258Smlaier if (!state_icmp) { 4835126258Smlaier 4836126258Smlaier /* 4837126258Smlaier * ICMP query/reply message not related to a TCP/UDP packet. 4838126258Smlaier * Search for an ICMP state. 4839126258Smlaier */ 4840130613Smlaier struct pf_state key; 4841126258Smlaier 4842126258Smlaier key.af = pd->af; 4843126258Smlaier key.proto = pd->proto; 4844130613Smlaier if (direction == PF_IN) { 4845130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 4846130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4847149884Smlaier key.ext.port = 0; 4848130613Smlaier key.gwy.port = icmpid; 4849130613Smlaier } else { 4850130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 4851130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 4852130613Smlaier key.lan.port = icmpid; 4853149884Smlaier key.ext.port = 0; 4854130613Smlaier } 4855126258Smlaier 4856126258Smlaier STATE_LOOKUP(); 4857126258Smlaier 4858126261Smlaier (*state)->expire = time_second; 4859126258Smlaier (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4860126258Smlaier 4861126258Smlaier /* translate source/destination address, if necessary */ 4862149884Smlaier if (STATE_TRANSLATE(*state)) { 4863126258Smlaier if (direction == PF_OUT) { 4864126258Smlaier switch (pd->af) { 4865126258Smlaier#ifdef INET 4866126258Smlaier case AF_INET: 4867126258Smlaier pf_change_a(&saddr->v4.s_addr, 4868126258Smlaier pd->ip_sum, 4869126258Smlaier (*state)->gwy.addr.v4.s_addr, 0); 4870149884Smlaier pd->hdr.icmp->icmp_cksum = 4871149884Smlaier pf_cksum_fixup( 4872149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 4873149884Smlaier (*state)->gwy.port, 0); 4874149884Smlaier pd->hdr.icmp->icmp_id = 4875149884Smlaier (*state)->gwy.port; 4876149884Smlaier m_copyback(m, off, ICMP_MINLEN, 4877149893Smlaier (caddr_t)pd->hdr.icmp); 4878126258Smlaier break; 4879126258Smlaier#endif /* INET */ 4880126258Smlaier#ifdef INET6 4881126258Smlaier case AF_INET6: 4882126258Smlaier pf_change_a6(saddr, 4883126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 4884126258Smlaier &(*state)->gwy.addr, 0); 4885126258Smlaier m_copyback(m, off, 4886126258Smlaier sizeof(struct icmp6_hdr), 4887126261Smlaier (caddr_t)pd->hdr.icmp6); 4888126258Smlaier break; 4889126258Smlaier#endif /* INET6 */ 4890126258Smlaier } 4891126258Smlaier } else { 4892126258Smlaier switch (pd->af) { 4893126258Smlaier#ifdef INET 4894126258Smlaier case AF_INET: 4895126258Smlaier pf_change_a(&daddr->v4.s_addr, 4896126258Smlaier pd->ip_sum, 4897126258Smlaier (*state)->lan.addr.v4.s_addr, 0); 4898149884Smlaier pd->hdr.icmp->icmp_cksum = 4899149884Smlaier pf_cksum_fixup( 4900149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 4901149884Smlaier (*state)->lan.port, 0); 4902149884Smlaier pd->hdr.icmp->icmp_id = 4903149884Smlaier (*state)->lan.port; 4904149884Smlaier m_copyback(m, off, ICMP_MINLEN, 4905149893Smlaier (caddr_t)pd->hdr.icmp); 4906126258Smlaier break; 4907126258Smlaier#endif /* INET */ 4908126258Smlaier#ifdef INET6 4909126258Smlaier case AF_INET6: 4910126258Smlaier pf_change_a6(daddr, 4911126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 4912126258Smlaier &(*state)->lan.addr, 0); 4913126258Smlaier m_copyback(m, off, 4914126258Smlaier sizeof(struct icmp6_hdr), 4915126261Smlaier (caddr_t)pd->hdr.icmp6); 4916126258Smlaier break; 4917126258Smlaier#endif /* INET6 */ 4918126258Smlaier } 4919126258Smlaier } 4920126258Smlaier } 4921126258Smlaier 4922126258Smlaier return (PF_PASS); 4923126258Smlaier 4924126258Smlaier } else { 4925126258Smlaier /* 4926126258Smlaier * ICMP error message in response to a TCP/UDP packet. 4927126258Smlaier * Extract the inner TCP/UDP header and search for that state. 4928126258Smlaier */ 4929126258Smlaier 4930126258Smlaier struct pf_pdesc pd2; 4931126258Smlaier#ifdef INET 4932126258Smlaier struct ip h2; 4933126258Smlaier#endif /* INET */ 4934126258Smlaier#ifdef INET6 4935126258Smlaier struct ip6_hdr h2_6; 4936126258Smlaier int terminal = 0; 4937126258Smlaier#endif /* INET6 */ 4938127629Smlaier int ipoff2 = 0; /* make the compiler happy */ 4939127629Smlaier int off2 = 0; /* make the compiler happy */ 4940126258Smlaier 4941126258Smlaier pd2.af = pd->af; 4942126258Smlaier switch (pd->af) { 4943126258Smlaier#ifdef INET 4944126258Smlaier case AF_INET: 4945126258Smlaier /* offset of h2 in mbuf chain */ 4946126258Smlaier ipoff2 = off + ICMP_MINLEN; 4947126258Smlaier 4948126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4949145836Smlaier NULL, reason, pd2.af)) { 4950126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 4951126258Smlaier ("pf: ICMP error message too short " 4952126258Smlaier "(ip)\n")); 4953126258Smlaier return (PF_DROP); 4954126258Smlaier } 4955126258Smlaier /* 4956126258Smlaier * ICMP error messages don't refer to non-first 4957126258Smlaier * fragments 4958126258Smlaier */ 4959145836Smlaier if (h2.ip_off & htons(IP_OFFMASK)) { 4960145836Smlaier REASON_SET(reason, PFRES_FRAG); 4961126258Smlaier return (PF_DROP); 4962145836Smlaier } 4963126258Smlaier 4964126258Smlaier /* offset of protocol header that follows h2 */ 4965126258Smlaier off2 = ipoff2 + (h2.ip_hl << 2); 4966126258Smlaier 4967126258Smlaier pd2.proto = h2.ip_p; 4968126258Smlaier pd2.src = (struct pf_addr *)&h2.ip_src; 4969126258Smlaier pd2.dst = (struct pf_addr *)&h2.ip_dst; 4970126258Smlaier pd2.ip_sum = &h2.ip_sum; 4971126258Smlaier break; 4972126258Smlaier#endif /* INET */ 4973126258Smlaier#ifdef INET6 4974126258Smlaier case AF_INET6: 4975126258Smlaier ipoff2 = off + sizeof(struct icmp6_hdr); 4976126258Smlaier 4977126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4978145836Smlaier NULL, reason, pd2.af)) { 4979126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 4980126258Smlaier ("pf: ICMP error message too short " 4981126258Smlaier "(ip6)\n")); 4982126258Smlaier return (PF_DROP); 4983126258Smlaier } 4984126258Smlaier pd2.proto = h2_6.ip6_nxt; 4985126258Smlaier pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4986126258Smlaier pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4987126258Smlaier pd2.ip_sum = NULL; 4988126258Smlaier off2 = ipoff2 + sizeof(h2_6); 4989126258Smlaier do { 4990126258Smlaier switch (pd2.proto) { 4991126258Smlaier case IPPROTO_FRAGMENT: 4992126258Smlaier /* 4993126258Smlaier * ICMPv6 error messages for 4994126258Smlaier * non-first fragments 4995126258Smlaier */ 4996145836Smlaier REASON_SET(reason, PFRES_FRAG); 4997126258Smlaier return (PF_DROP); 4998126258Smlaier case IPPROTO_AH: 4999126258Smlaier case IPPROTO_HOPOPTS: 5000126258Smlaier case IPPROTO_ROUTING: 5001126258Smlaier case IPPROTO_DSTOPTS: { 5002126258Smlaier /* get next header and header length */ 5003126258Smlaier struct ip6_ext opt6; 5004126258Smlaier 5005126258Smlaier if (!pf_pull_hdr(m, off2, &opt6, 5006145836Smlaier sizeof(opt6), NULL, reason, 5007145836Smlaier pd2.af)) { 5008126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5009126258Smlaier ("pf: ICMPv6 short opt\n")); 5010126258Smlaier return (PF_DROP); 5011126258Smlaier } 5012126258Smlaier if (pd2.proto == IPPROTO_AH) 5013126258Smlaier off2 += (opt6.ip6e_len + 2) * 4; 5014126258Smlaier else 5015126258Smlaier off2 += (opt6.ip6e_len + 1) * 8; 5016126258Smlaier pd2.proto = opt6.ip6e_nxt; 5017126258Smlaier /* goto the next header */ 5018126258Smlaier break; 5019126258Smlaier } 5020126258Smlaier default: 5021126258Smlaier terminal++; 5022126258Smlaier break; 5023126258Smlaier } 5024126258Smlaier } while (!terminal); 5025126258Smlaier break; 5026126258Smlaier#endif /* INET6 */ 5027126258Smlaier } 5028126258Smlaier 5029126258Smlaier switch (pd2.proto) { 5030126258Smlaier case IPPROTO_TCP: { 5031126258Smlaier struct tcphdr th; 5032126258Smlaier u_int32_t seq; 5033130613Smlaier struct pf_state key; 5034126258Smlaier struct pf_state_peer *src, *dst; 5035126258Smlaier u_int8_t dws; 5036128129Smlaier int copyback = 0; 5037126258Smlaier 5038126258Smlaier /* 5039126258Smlaier * Only the first 8 bytes of the TCP header can be 5040126258Smlaier * expected. Don't access any TCP header fields after 5041126258Smlaier * th_seq, an ackskew test is not possible. 5042126258Smlaier */ 5043145836Smlaier if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5044145836Smlaier pd2.af)) { 5045126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5046126258Smlaier ("pf: ICMP error message too short " 5047126258Smlaier "(tcp)\n")); 5048126258Smlaier return (PF_DROP); 5049126258Smlaier } 5050126258Smlaier 5051126258Smlaier key.af = pd2.af; 5052126258Smlaier key.proto = IPPROTO_TCP; 5053130613Smlaier if (direction == PF_IN) { 5054130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5055130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5056130613Smlaier key.ext.port = th.th_dport; 5057130613Smlaier key.gwy.port = th.th_sport; 5058130613Smlaier } else { 5059130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5060130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5061130613Smlaier key.lan.port = th.th_dport; 5062130613Smlaier key.ext.port = th.th_sport; 5063130613Smlaier } 5064126258Smlaier 5065126258Smlaier STATE_LOOKUP(); 5066126258Smlaier 5067126258Smlaier if (direction == (*state)->direction) { 5068126258Smlaier src = &(*state)->dst; 5069126258Smlaier dst = &(*state)->src; 5070126258Smlaier } else { 5071126258Smlaier src = &(*state)->src; 5072126258Smlaier dst = &(*state)->dst; 5073126258Smlaier } 5074126258Smlaier 5075130613Smlaier if (src->wscale && dst->wscale && 5076130613Smlaier !(th.th_flags & TH_SYN)) 5077126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 5078126258Smlaier else 5079126258Smlaier dws = 0; 5080126258Smlaier 5081126258Smlaier /* Demodulate sequence number */ 5082126258Smlaier seq = ntohl(th.th_seq) - src->seqdiff; 5083128129Smlaier if (src->seqdiff) { 5084128129Smlaier pf_change_a(&th.th_seq, icmpsum, 5085126258Smlaier htonl(seq), 0); 5086128129Smlaier copyback = 1; 5087128129Smlaier } 5088126258Smlaier 5089126258Smlaier if (!SEQ_GEQ(src->seqhi, seq) || 5090126258Smlaier !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 5091126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 5092126258Smlaier printf("pf: BAD ICMP %d:%d ", 5093126258Smlaier icmptype, pd->hdr.icmp->icmp_code); 5094126258Smlaier pf_print_host(pd->src, 0, pd->af); 5095126258Smlaier printf(" -> "); 5096126258Smlaier pf_print_host(pd->dst, 0, pd->af); 5097126258Smlaier printf(" state: "); 5098126258Smlaier pf_print_state(*state); 5099126258Smlaier printf(" seq=%u\n", seq); 5100126258Smlaier } 5101145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 5102126258Smlaier return (PF_DROP); 5103126258Smlaier } 5104126258Smlaier 5105126258Smlaier if (STATE_TRANSLATE(*state)) { 5106126258Smlaier if (direction == PF_IN) { 5107126258Smlaier pf_change_icmp(pd2.src, &th.th_sport, 5108128129Smlaier daddr, &(*state)->lan.addr, 5109126258Smlaier (*state)->lan.port, NULL, 5110126258Smlaier pd2.ip_sum, icmpsum, 5111126258Smlaier pd->ip_sum, 0, pd2.af); 5112126258Smlaier } else { 5113126258Smlaier pf_change_icmp(pd2.dst, &th.th_dport, 5114126258Smlaier saddr, &(*state)->gwy.addr, 5115126258Smlaier (*state)->gwy.port, NULL, 5116126258Smlaier pd2.ip_sum, icmpsum, 5117126258Smlaier pd->ip_sum, 0, pd2.af); 5118126258Smlaier } 5119128129Smlaier copyback = 1; 5120128129Smlaier } 5121128129Smlaier 5122128129Smlaier if (copyback) { 5123126258Smlaier switch (pd2.af) { 5124126258Smlaier#ifdef INET 5125126258Smlaier case AF_INET: 5126126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5127126261Smlaier (caddr_t)pd->hdr.icmp); 5128126258Smlaier m_copyback(m, ipoff2, sizeof(h2), 5129126261Smlaier (caddr_t)&h2); 5130126258Smlaier break; 5131126258Smlaier#endif /* INET */ 5132126258Smlaier#ifdef INET6 5133126258Smlaier case AF_INET6: 5134126258Smlaier m_copyback(m, off, 5135126258Smlaier sizeof(struct icmp6_hdr), 5136126261Smlaier (caddr_t)pd->hdr.icmp6); 5137126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5138126261Smlaier (caddr_t)&h2_6); 5139126258Smlaier break; 5140126258Smlaier#endif /* INET6 */ 5141126258Smlaier } 5142126261Smlaier m_copyback(m, off2, 8, (caddr_t)&th); 5143126258Smlaier } 5144126258Smlaier 5145126258Smlaier return (PF_PASS); 5146126258Smlaier break; 5147126258Smlaier } 5148126258Smlaier case IPPROTO_UDP: { 5149126258Smlaier struct udphdr uh; 5150130613Smlaier struct pf_state key; 5151126258Smlaier 5152126258Smlaier if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5153145836Smlaier NULL, reason, pd2.af)) { 5154126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5155126258Smlaier ("pf: ICMP error message too short " 5156126258Smlaier "(udp)\n")); 5157126258Smlaier return (PF_DROP); 5158126258Smlaier } 5159126258Smlaier 5160126258Smlaier key.af = pd2.af; 5161126258Smlaier key.proto = IPPROTO_UDP; 5162130613Smlaier if (direction == PF_IN) { 5163130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5164130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5165130613Smlaier key.ext.port = uh.uh_dport; 5166130613Smlaier key.gwy.port = uh.uh_sport; 5167130613Smlaier } else { 5168130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5169130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5170130613Smlaier key.lan.port = uh.uh_dport; 5171130613Smlaier key.ext.port = uh.uh_sport; 5172130613Smlaier } 5173126258Smlaier 5174126258Smlaier STATE_LOOKUP(); 5175126258Smlaier 5176126258Smlaier if (STATE_TRANSLATE(*state)) { 5177126258Smlaier if (direction == PF_IN) { 5178126258Smlaier pf_change_icmp(pd2.src, &uh.uh_sport, 5179126258Smlaier daddr, &(*state)->lan.addr, 5180126258Smlaier (*state)->lan.port, &uh.uh_sum, 5181126258Smlaier pd2.ip_sum, icmpsum, 5182126258Smlaier pd->ip_sum, 1, pd2.af); 5183126258Smlaier } else { 5184126258Smlaier pf_change_icmp(pd2.dst, &uh.uh_dport, 5185126258Smlaier saddr, &(*state)->gwy.addr, 5186126258Smlaier (*state)->gwy.port, &uh.uh_sum, 5187126258Smlaier pd2.ip_sum, icmpsum, 5188126258Smlaier pd->ip_sum, 1, pd2.af); 5189126258Smlaier } 5190126258Smlaier switch (pd2.af) { 5191126258Smlaier#ifdef INET 5192126258Smlaier case AF_INET: 5193126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5194126261Smlaier (caddr_t)pd->hdr.icmp); 5195126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5196126261Smlaier (caddr_t)&h2); 5197126258Smlaier break; 5198126258Smlaier#endif /* INET */ 5199126258Smlaier#ifdef INET6 5200126258Smlaier case AF_INET6: 5201126258Smlaier m_copyback(m, off, 5202126258Smlaier sizeof(struct icmp6_hdr), 5203126261Smlaier (caddr_t)pd->hdr.icmp6); 5204126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5205126261Smlaier (caddr_t)&h2_6); 5206126258Smlaier break; 5207126258Smlaier#endif /* INET6 */ 5208126258Smlaier } 5209126261Smlaier m_copyback(m, off2, sizeof(uh), 5210126261Smlaier (caddr_t)&uh); 5211126258Smlaier } 5212126258Smlaier 5213126258Smlaier return (PF_PASS); 5214126258Smlaier break; 5215126258Smlaier } 5216126258Smlaier#ifdef INET 5217126258Smlaier case IPPROTO_ICMP: { 5218126258Smlaier struct icmp iih; 5219130613Smlaier struct pf_state key; 5220126258Smlaier 5221126258Smlaier if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5222145836Smlaier NULL, reason, pd2.af)) { 5223126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5224126258Smlaier ("pf: ICMP error message too short i" 5225126258Smlaier "(icmp)\n")); 5226126258Smlaier return (PF_DROP); 5227126258Smlaier } 5228126258Smlaier 5229126258Smlaier key.af = pd2.af; 5230126258Smlaier key.proto = IPPROTO_ICMP; 5231130613Smlaier if (direction == PF_IN) { 5232130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5233130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5234149884Smlaier key.ext.port = 0; 5235130613Smlaier key.gwy.port = iih.icmp_id; 5236130613Smlaier } else { 5237130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5238130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5239130613Smlaier key.lan.port = iih.icmp_id; 5240149884Smlaier key.ext.port = 0; 5241130613Smlaier } 5242126258Smlaier 5243126258Smlaier STATE_LOOKUP(); 5244126258Smlaier 5245126258Smlaier if (STATE_TRANSLATE(*state)) { 5246126258Smlaier if (direction == PF_IN) { 5247126258Smlaier pf_change_icmp(pd2.src, &iih.icmp_id, 5248126258Smlaier daddr, &(*state)->lan.addr, 5249126258Smlaier (*state)->lan.port, NULL, 5250126258Smlaier pd2.ip_sum, icmpsum, 5251126258Smlaier pd->ip_sum, 0, AF_INET); 5252126258Smlaier } else { 5253126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp_id, 5254126258Smlaier saddr, &(*state)->gwy.addr, 5255126258Smlaier (*state)->gwy.port, NULL, 5256126258Smlaier pd2.ip_sum, icmpsum, 5257126258Smlaier pd->ip_sum, 0, AF_INET); 5258126258Smlaier } 5259126261Smlaier m_copyback(m, off, ICMP_MINLEN, 5260126261Smlaier (caddr_t)pd->hdr.icmp); 5261126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5262126261Smlaier (caddr_t)&h2); 5263126261Smlaier m_copyback(m, off2, ICMP_MINLEN, 5264126261Smlaier (caddr_t)&iih); 5265126258Smlaier } 5266126258Smlaier 5267126258Smlaier return (PF_PASS); 5268126258Smlaier break; 5269126258Smlaier } 5270126258Smlaier#endif /* INET */ 5271126258Smlaier#ifdef INET6 5272126258Smlaier case IPPROTO_ICMPV6: { 5273126258Smlaier struct icmp6_hdr iih; 5274130613Smlaier struct pf_state key; 5275126258Smlaier 5276126258Smlaier if (!pf_pull_hdr(m, off2, &iih, 5277145836Smlaier sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5278126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5279126258Smlaier ("pf: ICMP error message too short " 5280126258Smlaier "(icmp6)\n")); 5281126258Smlaier return (PF_DROP); 5282126258Smlaier } 5283126258Smlaier 5284126258Smlaier key.af = pd2.af; 5285126258Smlaier key.proto = IPPROTO_ICMPV6; 5286130613Smlaier if (direction == PF_IN) { 5287130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5288130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5289149884Smlaier key.ext.port = 0; 5290130613Smlaier key.gwy.port = iih.icmp6_id; 5291130613Smlaier } else { 5292130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5293130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5294130613Smlaier key.lan.port = iih.icmp6_id; 5295149884Smlaier key.ext.port = 0; 5296130613Smlaier } 5297126258Smlaier 5298126258Smlaier STATE_LOOKUP(); 5299126258Smlaier 5300126258Smlaier if (STATE_TRANSLATE(*state)) { 5301126258Smlaier if (direction == PF_IN) { 5302126258Smlaier pf_change_icmp(pd2.src, &iih.icmp6_id, 5303126258Smlaier daddr, &(*state)->lan.addr, 5304126258Smlaier (*state)->lan.port, NULL, 5305126258Smlaier pd2.ip_sum, icmpsum, 5306126258Smlaier pd->ip_sum, 0, AF_INET6); 5307126258Smlaier } else { 5308126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp6_id, 5309126258Smlaier saddr, &(*state)->gwy.addr, 5310126258Smlaier (*state)->gwy.port, NULL, 5311126258Smlaier pd2.ip_sum, icmpsum, 5312126258Smlaier pd->ip_sum, 0, AF_INET6); 5313126258Smlaier } 5314126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 5315126261Smlaier (caddr_t)pd->hdr.icmp6); 5316126261Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5317126261Smlaier (caddr_t)&h2_6); 5318126258Smlaier m_copyback(m, off2, sizeof(struct icmp6_hdr), 5319126261Smlaier (caddr_t)&iih); 5320126258Smlaier } 5321126258Smlaier 5322126258Smlaier return (PF_PASS); 5323126258Smlaier break; 5324126258Smlaier } 5325126258Smlaier#endif /* INET6 */ 5326126258Smlaier default: { 5327130613Smlaier struct pf_state key; 5328126258Smlaier 5329126258Smlaier key.af = pd2.af; 5330126258Smlaier key.proto = pd2.proto; 5331130613Smlaier if (direction == PF_IN) { 5332130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5333130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5334130613Smlaier key.ext.port = 0; 5335130613Smlaier key.gwy.port = 0; 5336130613Smlaier } else { 5337130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5338130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5339130613Smlaier key.lan.port = 0; 5340130613Smlaier key.ext.port = 0; 5341130613Smlaier } 5342126258Smlaier 5343126258Smlaier STATE_LOOKUP(); 5344126258Smlaier 5345126258Smlaier if (STATE_TRANSLATE(*state)) { 5346126258Smlaier if (direction == PF_IN) { 5347126258Smlaier pf_change_icmp(pd2.src, NULL, 5348126258Smlaier daddr, &(*state)->lan.addr, 5349126258Smlaier 0, NULL, 5350126258Smlaier pd2.ip_sum, icmpsum, 5351126258Smlaier pd->ip_sum, 0, pd2.af); 5352126258Smlaier } else { 5353126258Smlaier pf_change_icmp(pd2.dst, NULL, 5354126258Smlaier saddr, &(*state)->gwy.addr, 5355126258Smlaier 0, NULL, 5356126258Smlaier pd2.ip_sum, icmpsum, 5357126258Smlaier pd->ip_sum, 0, pd2.af); 5358126258Smlaier } 5359126258Smlaier switch (pd2.af) { 5360126258Smlaier#ifdef INET 5361126258Smlaier case AF_INET: 5362126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5363126261Smlaier (caddr_t)pd->hdr.icmp); 5364126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5365126261Smlaier (caddr_t)&h2); 5366126258Smlaier break; 5367126258Smlaier#endif /* INET */ 5368126258Smlaier#ifdef INET6 5369126258Smlaier case AF_INET6: 5370126258Smlaier m_copyback(m, off, 5371126258Smlaier sizeof(struct icmp6_hdr), 5372126261Smlaier (caddr_t)pd->hdr.icmp6); 5373126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5374126261Smlaier (caddr_t)&h2_6); 5375126258Smlaier break; 5376126258Smlaier#endif /* INET6 */ 5377126258Smlaier } 5378126258Smlaier } 5379126258Smlaier 5380126258Smlaier return (PF_PASS); 5381126258Smlaier break; 5382126258Smlaier } 5383126258Smlaier } 5384126258Smlaier } 5385126258Smlaier} 5386126258Smlaier 5387126258Smlaierint 5388130613Smlaierpf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5389126258Smlaier struct pf_pdesc *pd) 5390126258Smlaier{ 5391126258Smlaier struct pf_state_peer *src, *dst; 5392130613Smlaier struct pf_state key; 5393126258Smlaier 5394126258Smlaier key.af = pd->af; 5395126258Smlaier key.proto = pd->proto; 5396130613Smlaier if (direction == PF_IN) { 5397130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5398130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5399130613Smlaier key.ext.port = 0; 5400130613Smlaier key.gwy.port = 0; 5401130613Smlaier } else { 5402130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5403130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5404130613Smlaier key.lan.port = 0; 5405130613Smlaier key.ext.port = 0; 5406130613Smlaier } 5407126258Smlaier 5408126258Smlaier STATE_LOOKUP(); 5409126258Smlaier 5410126258Smlaier if (direction == (*state)->direction) { 5411126258Smlaier src = &(*state)->src; 5412126258Smlaier dst = &(*state)->dst; 5413126258Smlaier } else { 5414126258Smlaier src = &(*state)->dst; 5415126258Smlaier dst = &(*state)->src; 5416126258Smlaier } 5417126258Smlaier 5418126258Smlaier /* update states */ 5419126258Smlaier if (src->state < PFOTHERS_SINGLE) 5420126258Smlaier src->state = PFOTHERS_SINGLE; 5421126258Smlaier if (dst->state == PFOTHERS_SINGLE) 5422126258Smlaier dst->state = PFOTHERS_MULTIPLE; 5423126258Smlaier 5424126258Smlaier /* update expire time */ 5425126261Smlaier (*state)->expire = time_second; 5426126258Smlaier if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5427126258Smlaier (*state)->timeout = PFTM_OTHER_MULTIPLE; 5428126258Smlaier else 5429126258Smlaier (*state)->timeout = PFTM_OTHER_SINGLE; 5430126258Smlaier 5431126258Smlaier /* translate source/destination address, if necessary */ 5432126258Smlaier if (STATE_TRANSLATE(*state)) { 5433126258Smlaier if (direction == PF_OUT) 5434126258Smlaier switch (pd->af) { 5435126258Smlaier#ifdef INET 5436126258Smlaier case AF_INET: 5437126258Smlaier pf_change_a(&pd->src->v4.s_addr, 5438126258Smlaier pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5439126258Smlaier 0); 5440126258Smlaier break; 5441126258Smlaier#endif /* INET */ 5442126258Smlaier#ifdef INET6 5443126258Smlaier case AF_INET6: 5444126258Smlaier PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 5445126258Smlaier break; 5446126258Smlaier#endif /* INET6 */ 5447126258Smlaier } 5448126258Smlaier else 5449126258Smlaier switch (pd->af) { 5450126258Smlaier#ifdef INET 5451126258Smlaier case AF_INET: 5452126258Smlaier pf_change_a(&pd->dst->v4.s_addr, 5453126258Smlaier pd->ip_sum, (*state)->lan.addr.v4.s_addr, 5454126258Smlaier 0); 5455126258Smlaier break; 5456126258Smlaier#endif /* INET */ 5457126258Smlaier#ifdef INET6 5458126258Smlaier case AF_INET6: 5459126258Smlaier PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 5460126258Smlaier break; 5461126258Smlaier#endif /* INET6 */ 5462126258Smlaier } 5463126258Smlaier } 5464126258Smlaier 5465126258Smlaier return (PF_PASS); 5466126258Smlaier} 5467126258Smlaier 5468126258Smlaier/* 5469126258Smlaier * ipoff and off are measured from the start of the mbuf chain. 5470126258Smlaier * h must be at "ipoff" on the mbuf chain. 5471126258Smlaier */ 5472126258Smlaiervoid * 5473126258Smlaierpf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5474126258Smlaier u_short *actionp, u_short *reasonp, sa_family_t af) 5475126258Smlaier{ 5476126258Smlaier switch (af) { 5477126258Smlaier#ifdef INET 5478126258Smlaier case AF_INET: { 5479126258Smlaier struct ip *h = mtod(m, struct ip *); 5480126258Smlaier u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5481126258Smlaier 5482126258Smlaier if (fragoff) { 5483126258Smlaier if (fragoff >= len) 5484126258Smlaier ACTION_SET(actionp, PF_PASS); 5485126258Smlaier else { 5486126258Smlaier ACTION_SET(actionp, PF_DROP); 5487126258Smlaier REASON_SET(reasonp, PFRES_FRAG); 5488126258Smlaier } 5489126258Smlaier return (NULL); 5490126258Smlaier } 5491130613Smlaier if (m->m_pkthdr.len < off + len || 5492130613Smlaier ntohs(h->ip_len) < off + len) { 5493126258Smlaier ACTION_SET(actionp, PF_DROP); 5494126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5495126258Smlaier return (NULL); 5496126258Smlaier } 5497126258Smlaier break; 5498126258Smlaier } 5499126258Smlaier#endif /* INET */ 5500126258Smlaier#ifdef INET6 5501126258Smlaier case AF_INET6: { 5502126258Smlaier struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5503126258Smlaier 5504126258Smlaier if (m->m_pkthdr.len < off + len || 5505126258Smlaier (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5506126258Smlaier (unsigned)(off + len)) { 5507126258Smlaier ACTION_SET(actionp, PF_DROP); 5508126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5509126258Smlaier return (NULL); 5510126258Smlaier } 5511126258Smlaier break; 5512126258Smlaier } 5513126258Smlaier#endif /* INET6 */ 5514126258Smlaier } 5515126258Smlaier m_copydata(m, off, len, p); 5516126258Smlaier return (p); 5517126258Smlaier} 5518126258Smlaier 5519126258Smlaierint 5520126258Smlaierpf_routable(struct pf_addr *addr, sa_family_t af) 5521126258Smlaier{ 5522126258Smlaier struct sockaddr_in *dst; 5523145836Smlaier#ifdef INET6 5524145836Smlaier struct sockaddr_in6 *dst6; 5525145836Smlaier struct route_in6 ro; 5526145836Smlaier#else 5527126258Smlaier struct route ro; 5528145836Smlaier#endif 5529126258Smlaier 5530126258Smlaier bzero(&ro, sizeof(ro)); 5531145836Smlaier switch (af) { 5532145836Smlaier case AF_INET: 5533145836Smlaier dst = satosin(&ro.ro_dst); 5534145836Smlaier dst->sin_family = AF_INET; 5535145836Smlaier dst->sin_len = sizeof(*dst); 5536145836Smlaier dst->sin_addr = addr->v4; 5537145836Smlaier break; 5538145836Smlaier#ifdef INET6 5539145836Smlaier case AF_INET6: 5540145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5541145836Smlaier dst6->sin6_family = AF_INET6; 5542145836Smlaier dst6->sin6_len = sizeof(*dst6); 5543145836Smlaier dst6->sin6_addr = addr->v6; 5544145836Smlaier break; 5545145836Smlaier#endif /* INET6 */ 5546145836Smlaier default: 5547145836Smlaier return (0); 5548145836Smlaier } 5549145836Smlaier 5550127145Smlaier#ifdef __FreeBSD__ 5551126261Smlaier#ifdef RTF_PRCLONING 5552145836Smlaier rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5553126261Smlaier#else /* !RTF_PRCLONING */ 5554145836Smlaier rtalloc_ign((struct route *)&ro, RTF_CLONING); 5555126261Smlaier#endif 5556126261Smlaier#else /* ! __FreeBSD__ */ 5557145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 5558126261Smlaier#endif 5559126258Smlaier 5560126258Smlaier if (ro.ro_rt != NULL) { 5561126258Smlaier RTFREE(ro.ro_rt); 5562145836Smlaier return (1); 5563126258Smlaier } 5564126258Smlaier 5565145836Smlaier return (0); 5566145836Smlaier} 5567145836Smlaier 5568145836Smlaierint 5569145836Smlaierpf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5570145836Smlaier{ 5571145836Smlaier struct sockaddr_in *dst; 5572145836Smlaier#ifdef INET6 5573145836Smlaier struct sockaddr_in6 *dst6; 5574145836Smlaier struct route_in6 ro; 5575145836Smlaier#else 5576145836Smlaier struct route ro; 5577145836Smlaier#endif 5578145836Smlaier int ret = 0; 5579145836Smlaier 5580145836Smlaier bzero(&ro, sizeof(ro)); 5581145836Smlaier switch (af) { 5582145836Smlaier case AF_INET: 5583145836Smlaier dst = satosin(&ro.ro_dst); 5584145836Smlaier dst->sin_family = AF_INET; 5585145836Smlaier dst->sin_len = sizeof(*dst); 5586145836Smlaier dst->sin_addr = addr->v4; 5587145836Smlaier break; 5588145836Smlaier#ifdef INET6 5589145836Smlaier case AF_INET6: 5590145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5591145836Smlaier dst6->sin6_family = AF_INET6; 5592145836Smlaier dst6->sin6_len = sizeof(*dst6); 5593145836Smlaier dst6->sin6_addr = addr->v6; 5594145836Smlaier break; 5595145836Smlaier#endif /* INET6 */ 5596145836Smlaier default: 5597145836Smlaier return (0); 5598145836Smlaier } 5599145836Smlaier 5600145836Smlaier#ifdef __FreeBSD__ 5601145836Smlaier# ifdef RTF_PRCLONING 5602145836Smlaier rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 5603145836Smlaier# else /* !RTF_PRCLONING */ 5604145836Smlaier rtalloc_ign((struct route *)&ro, RTF_CLONING); 5605145836Smlaier# endif 5606145836Smlaier#else /* ! __FreeBSD__ */ 5607145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 5608145836Smlaier#endif 5609145836Smlaier 5610145836Smlaier if (ro.ro_rt != NULL) { 5611145836Smlaier#ifdef __FreeBSD__ 5612145836Smlaier /* XXX_IMPORT: later */ 5613145836Smlaier#else 5614145836Smlaier if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 5615145836Smlaier ret = 1; 5616145836Smlaier#endif 5617145836Smlaier RTFREE(ro.ro_rt); 5618145836Smlaier } 5619145836Smlaier 5620126258Smlaier return (ret); 5621126258Smlaier} 5622126258Smlaier 5623126258Smlaier#ifdef INET 5624126261Smlaier 5625126258Smlaiervoid 5626126258Smlaierpf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5627126258Smlaier struct pf_state *s) 5628126258Smlaier{ 5629126258Smlaier struct mbuf *m0, *m1; 5630132303Smlaier struct m_tag *mtag; 5631126258Smlaier struct route iproute; 5632127629Smlaier struct route *ro = NULL; /* XXX: was uninitialized */ 5633126258Smlaier struct sockaddr_in *dst; 5634126258Smlaier struct ip *ip; 5635126258Smlaier struct ifnet *ifp = NULL; 5636126258Smlaier struct pf_addr naddr; 5637130613Smlaier struct pf_src_node *sn = NULL; 5638126258Smlaier int error = 0; 5639127145Smlaier#ifdef __FreeBSD__ 5640126261Smlaier int sw_csum; 5641126261Smlaier#endif 5642126258Smlaier 5643126258Smlaier if (m == NULL || *m == NULL || r == NULL || 5644126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5645126258Smlaier panic("pf_route: invalid parameters"); 5646126258Smlaier 5647132303Smlaier if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) { 5648132303Smlaier if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) == 5649132303Smlaier NULL) { 5650132303Smlaier m0 = *m; 5651132303Smlaier *m = NULL; 5652132303Smlaier goto bad; 5653132303Smlaier } 5654132303Smlaier *(char *)(mtag + 1) = 1; 5655132303Smlaier m_tag_prepend(*m, mtag); 5656132303Smlaier } else { 5657132303Smlaier if (*(char *)(mtag + 1) > 3) { 5658132303Smlaier m0 = *m; 5659132303Smlaier *m = NULL; 5660132303Smlaier goto bad; 5661132303Smlaier } 5662132303Smlaier (*(char *)(mtag + 1))++; 5663132303Smlaier } 5664132303Smlaier 5665126258Smlaier if (r->rt == PF_DUPTO) { 5666127145Smlaier#ifdef __FreeBSD__ 5667132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 5668126261Smlaier#else 5669132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5670126261Smlaier#endif 5671126258Smlaier return; 5672126258Smlaier } else { 5673126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5674126258Smlaier return; 5675126258Smlaier m0 = *m; 5676126258Smlaier } 5677126258Smlaier 5678145836Smlaier if (m0->m_len < sizeof(struct ip)) { 5679145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 5680145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5681145836Smlaier goto bad; 5682145836Smlaier } 5683145836Smlaier 5684126258Smlaier ip = mtod(m0, struct ip *); 5685126258Smlaier 5686126258Smlaier ro = &iproute; 5687126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 5688126258Smlaier dst = satosin(&ro->ro_dst); 5689126258Smlaier dst->sin_family = AF_INET; 5690126258Smlaier dst->sin_len = sizeof(*dst); 5691126258Smlaier dst->sin_addr = ip->ip_dst; 5692126258Smlaier 5693126258Smlaier if (r->rt == PF_FASTROUTE) { 5694126258Smlaier rtalloc(ro); 5695126258Smlaier if (ro->ro_rt == 0) { 5696126258Smlaier ipstat.ips_noroute++; 5697126258Smlaier goto bad; 5698126258Smlaier } 5699126258Smlaier 5700126258Smlaier ifp = ro->ro_rt->rt_ifp; 5701126258Smlaier ro->ro_rt->rt_use++; 5702126258Smlaier 5703126258Smlaier if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5704126258Smlaier dst = satosin(ro->ro_rt->rt_gateway); 5705126258Smlaier } else { 5706145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 5707145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 5708145836Smlaier ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5709145836Smlaier goto bad; 5710145836Smlaier } 5711126258Smlaier if (s == NULL) { 5712130613Smlaier pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5713130613Smlaier &naddr, NULL, &sn); 5714126258Smlaier if (!PF_AZERO(&naddr, AF_INET)) 5715126258Smlaier dst->sin_addr.s_addr = naddr.v4.s_addr; 5716130613Smlaier ifp = r->rpool.cur->kif ? 5717130613Smlaier r->rpool.cur->kif->pfik_ifp : NULL; 5718126258Smlaier } else { 5719126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET)) 5720126258Smlaier dst->sin_addr.s_addr = 5721126258Smlaier s->rt_addr.v4.s_addr; 5722130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5723126258Smlaier } 5724126258Smlaier } 5725126258Smlaier if (ifp == NULL) 5726126258Smlaier goto bad; 5727126258Smlaier 5728130639Smlaier if (oifp != ifp) { 5729127145Smlaier#ifdef __FreeBSD__ 5730126261Smlaier PF_UNLOCK(); 5731145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5732126261Smlaier PF_LOCK(); 5733126261Smlaier goto bad; 5734126261Smlaier } else if (m0 == NULL) { 5735126261Smlaier PF_LOCK(); 5736126261Smlaier goto done; 5737126261Smlaier } 5738126261Smlaier PF_LOCK(); 5739126261Smlaier#else 5740145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5741126258Smlaier goto bad; 5742126258Smlaier else if (m0 == NULL) 5743126258Smlaier goto done; 5744126261Smlaier#endif 5745145836Smlaier if (m0->m_len < sizeof(struct ip)) { 5746145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 5747145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5748145836Smlaier goto bad; 5749145836Smlaier } 5750126258Smlaier ip = mtod(m0, struct ip *); 5751126258Smlaier } 5752126258Smlaier 5753127145Smlaier#ifdef __FreeBSD__ 5754126261Smlaier /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 5755126261Smlaier m0->m_pkthdr.csum_flags |= CSUM_IP; 5756126261Smlaier sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5757126261Smlaier if (sw_csum & CSUM_DELAY_DATA) { 5758126261Smlaier /* 5759126261Smlaier * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 5760126261Smlaier */ 5761126261Smlaier NTOHS(ip->ip_len); 5762126261Smlaier NTOHS(ip->ip_off); /* XXX: needed? */ 5763126261Smlaier in_delayed_cksum(m0); 5764126261Smlaier HTONS(ip->ip_len); 5765126261Smlaier HTONS(ip->ip_off); 5766126261Smlaier sw_csum &= ~CSUM_DELAY_DATA; 5767126261Smlaier } 5768126261Smlaier m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5769126261Smlaier 5770126261Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu || 5771126261Smlaier (ifp->if_hwassist & CSUM_FRAGMENT && 5772126261Smlaier ((ip->ip_off & htons(IP_DF)) == 0))) { 5773126261Smlaier /* 5774126261Smlaier * ip->ip_len = htons(ip->ip_len); 5775126261Smlaier * ip->ip_off = htons(ip->ip_off); 5776126261Smlaier */ 5777126261Smlaier ip->ip_sum = 0; 5778126261Smlaier if (sw_csum & CSUM_DELAY_IP) { 5779126261Smlaier /* From KAME */ 5780126261Smlaier if (ip->ip_v == IPVERSION && 5781126261Smlaier (ip->ip_hl << 2) == sizeof(*ip)) { 5782126261Smlaier ip->ip_sum = in_cksum_hdr(ip); 5783126261Smlaier } else { 5784126261Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5785126261Smlaier } 5786126261Smlaier } 5787126261Smlaier PF_UNLOCK(); 5788126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt); 5789126261Smlaier PF_LOCK(); 5790126261Smlaier goto done; 5791126261Smlaier } 5792126261Smlaier 5793126261Smlaier#else 5794126258Smlaier /* Copied from ip_output. */ 5795130613Smlaier#ifdef IPSEC 5796130613Smlaier /* 5797130613Smlaier * If deferred crypto processing is needed, check that the 5798130613Smlaier * interface supports it. 5799130613Smlaier */ 5800130613Smlaier if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 5801130613Smlaier != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 5802130613Smlaier /* Notify IPsec to do its own crypto. */ 5803130613Smlaier ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 5804130613Smlaier goto bad; 5805130613Smlaier } 5806130613Smlaier#endif /* IPSEC */ 5807130613Smlaier 5808130613Smlaier /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 5809130613Smlaier if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT) { 5810130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 5811130613Smlaier ifp->if_bridge != NULL) { 5812130613Smlaier in_delayed_cksum(m0); 5813130613Smlaier m0->m_pkthdr.csum &= ~M_TCPV4_CSUM_OUT; /* Clear */ 5814130613Smlaier } 5815130613Smlaier } else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT) { 5816130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 5817130613Smlaier ifp->if_bridge != NULL) { 5818130613Smlaier in_delayed_cksum(m0); 5819130613Smlaier m0->m_pkthdr.csum &= ~M_UDPV4_CSUM_OUT; /* Clear */ 5820130613Smlaier } 5821130613Smlaier } 5822130613Smlaier 5823126258Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu) { 5824126258Smlaier if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 5825126258Smlaier ifp->if_bridge == NULL) { 5826126258Smlaier m0->m_pkthdr.csum |= M_IPV4_CSUM_OUT; 5827126258Smlaier ipstat.ips_outhwcsum++; 5828126258Smlaier } else { 5829126258Smlaier ip->ip_sum = 0; 5830126258Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5831126258Smlaier } 5832126258Smlaier /* Update relevant hardware checksum stats for TCP/UDP */ 5833126258Smlaier if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT) 5834126258Smlaier tcpstat.tcps_outhwcsum++; 5835126258Smlaier else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT) 5836126258Smlaier udpstat.udps_outhwcsum++; 5837126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 5838126258Smlaier goto done; 5839126258Smlaier } 5840126261Smlaier#endif 5841126258Smlaier /* 5842126258Smlaier * Too large for interface; fragment if possible. 5843126258Smlaier * Must be able to put at least 8 bytes per fragment. 5844126258Smlaier */ 5845126258Smlaier if (ip->ip_off & htons(IP_DF)) { 5846126258Smlaier ipstat.ips_cantfrag++; 5847126258Smlaier if (r->rt != PF_DUPTO) { 5848127145Smlaier#ifdef __FreeBSD__ 5849126261Smlaier /* icmp_error() expects host byte ordering */ 5850126261Smlaier NTOHS(ip->ip_len); 5851126261Smlaier NTOHS(ip->ip_off); 5852126261Smlaier PF_UNLOCK(); 5853126258Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5854145886Smlaier ifp->if_mtu); 5855145874Smlaier PF_LOCK(); 5856145874Smlaier#else 5857145874Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5858145873Smlaier ifp); 5859126261Smlaier#endif 5860126258Smlaier goto done; 5861126258Smlaier } else 5862126258Smlaier goto bad; 5863126258Smlaier } 5864126258Smlaier 5865126258Smlaier m1 = m0; 5866127145Smlaier#ifdef __FreeBSD__ 5867126261Smlaier /* 5868126261Smlaier * XXX: is cheaper + less error prone than own function 5869126261Smlaier */ 5870126261Smlaier NTOHS(ip->ip_len); 5871126261Smlaier NTOHS(ip->ip_off); 5872126261Smlaier error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5873126261Smlaier#else 5874126258Smlaier error = ip_fragment(m0, ifp, ifp->if_mtu); 5875126261Smlaier#endif 5876127531Smlaier if (error) { 5877127531Smlaier#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 5878127531Smlaier m0 = NULL; 5879126261Smlaier#endif 5880126258Smlaier goto bad; 5881127531Smlaier } 5882126258Smlaier 5883126258Smlaier for (m0 = m1; m0; m0 = m1) { 5884126258Smlaier m1 = m0->m_nextpkt; 5885126258Smlaier m0->m_nextpkt = 0; 5886127145Smlaier#ifdef __FreeBSD__ 5887126261Smlaier if (error == 0) { 5888126261Smlaier PF_UNLOCK(); 5889126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5890126261Smlaier NULL); 5891126261Smlaier PF_LOCK(); 5892126261Smlaier } else 5893126261Smlaier#else 5894126258Smlaier if (error == 0) 5895126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5896126258Smlaier NULL); 5897126258Smlaier else 5898126261Smlaier#endif 5899126258Smlaier m_freem(m0); 5900126258Smlaier } 5901126258Smlaier 5902126258Smlaier if (error == 0) 5903126258Smlaier ipstat.ips_fragmented++; 5904126258Smlaier 5905126258Smlaierdone: 5906126258Smlaier if (r->rt != PF_DUPTO) 5907126258Smlaier *m = NULL; 5908126258Smlaier if (ro == &iproute && ro->ro_rt) 5909126258Smlaier RTFREE(ro->ro_rt); 5910126258Smlaier return; 5911126258Smlaier 5912126258Smlaierbad: 5913126258Smlaier m_freem(m0); 5914126258Smlaier goto done; 5915126258Smlaier} 5916126258Smlaier#endif /* INET */ 5917126258Smlaier 5918126258Smlaier#ifdef INET6 5919126258Smlaiervoid 5920126258Smlaierpf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5921126258Smlaier struct pf_state *s) 5922126258Smlaier{ 5923126258Smlaier struct mbuf *m0; 5924126258Smlaier struct m_tag *mtag; 5925126258Smlaier struct route_in6 ip6route; 5926126258Smlaier struct route_in6 *ro; 5927126258Smlaier struct sockaddr_in6 *dst; 5928126258Smlaier struct ip6_hdr *ip6; 5929126258Smlaier struct ifnet *ifp = NULL; 5930126258Smlaier struct pf_addr naddr; 5931130613Smlaier struct pf_src_node *sn = NULL; 5932126258Smlaier int error = 0; 5933126258Smlaier 5934126258Smlaier if (m == NULL || *m == NULL || r == NULL || 5935126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5936126258Smlaier panic("pf_route6: invalid parameters"); 5937126258Smlaier 5938132303Smlaier if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) { 5939132303Smlaier if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) == 5940132303Smlaier NULL) { 5941132303Smlaier m0 = *m; 5942132303Smlaier *m = NULL; 5943132303Smlaier goto bad; 5944132303Smlaier } 5945132303Smlaier *(char *)(mtag + 1) = 1; 5946132303Smlaier m_tag_prepend(*m, mtag); 5947132303Smlaier } else { 5948132303Smlaier if (*(char *)(mtag + 1) > 3) { 5949132303Smlaier m0 = *m; 5950132303Smlaier *m = NULL; 5951132303Smlaier goto bad; 5952132303Smlaier } 5953132303Smlaier (*(char *)(mtag + 1))++; 5954132303Smlaier } 5955132303Smlaier 5956126258Smlaier if (r->rt == PF_DUPTO) { 5957127145Smlaier#ifdef __FreeBSD__ 5958132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 5959126261Smlaier#else 5960132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5961126261Smlaier#endif 5962126258Smlaier return; 5963126258Smlaier } else { 5964126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5965126258Smlaier return; 5966126258Smlaier m0 = *m; 5967126258Smlaier } 5968126258Smlaier 5969145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 5970145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 5971145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5972145836Smlaier goto bad; 5973145836Smlaier } 5974126258Smlaier ip6 = mtod(m0, struct ip6_hdr *); 5975126258Smlaier 5976126258Smlaier ro = &ip6route; 5977126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 5978126258Smlaier dst = (struct sockaddr_in6 *)&ro->ro_dst; 5979126258Smlaier dst->sin6_family = AF_INET6; 5980126258Smlaier dst->sin6_len = sizeof(*dst); 5981126258Smlaier dst->sin6_addr = ip6->ip6_dst; 5982126258Smlaier 5983126258Smlaier /* Cheat. */ 5984126258Smlaier if (r->rt == PF_FASTROUTE) { 5985127145Smlaier#ifdef __FreeBSD__ 5986132280Smlaier m0->m_flags |= M_SKIP_FIREWALL; 5987126261Smlaier PF_UNLOCK(); 5988126261Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5989126261Smlaier PF_LOCK(); 5990126261Smlaier#else 5991132280Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 5992132280Smlaier if (mtag == NULL) 5993132280Smlaier goto bad; 5994132280Smlaier m_tag_prepend(m0, mtag); 5995126258Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL); 5996126261Smlaier#endif 5997126258Smlaier return; 5998126258Smlaier } 5999126258Smlaier 6000145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 6001145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6002145836Smlaier ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6003145836Smlaier goto bad; 6004145836Smlaier } 6005126258Smlaier if (s == NULL) { 6006130613Smlaier pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6007130613Smlaier &naddr, NULL, &sn); 6008126258Smlaier if (!PF_AZERO(&naddr, AF_INET6)) 6009126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6010126258Smlaier &naddr, AF_INET6); 6011130613Smlaier ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6012126258Smlaier } else { 6013126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6014126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6015126258Smlaier &s->rt_addr, AF_INET6); 6016130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6017126258Smlaier } 6018126258Smlaier if (ifp == NULL) 6019126258Smlaier goto bad; 6020126258Smlaier 6021126258Smlaier if (oifp != ifp) { 6022127145Smlaier#ifdef __FreeBSD__ 6023132303Smlaier PF_UNLOCK(); 6024145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6025126261Smlaier PF_LOCK(); 6026132303Smlaier goto bad; 6027132303Smlaier } else if (m0 == NULL) { 6028132303Smlaier PF_LOCK(); 6029132303Smlaier goto done; 6030132303Smlaier } 6031132303Smlaier PF_LOCK(); 6032126261Smlaier#else 6033145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6034132303Smlaier goto bad; 6035132303Smlaier else if (m0 == NULL) 6036132303Smlaier goto done; 6037126261Smlaier#endif 6038145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 6039145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6040145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6041145836Smlaier goto bad; 6042145836Smlaier } 6043132303Smlaier ip6 = mtod(m0, struct ip6_hdr *); 6044126258Smlaier } 6045126258Smlaier 6046126258Smlaier /* 6047126258Smlaier * If the packet is too large for the outgoing interface, 6048126258Smlaier * send back an icmp6 error. 6049126258Smlaier */ 6050126258Smlaier if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 6051126258Smlaier dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6052126258Smlaier if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6053127145Smlaier#ifdef __FreeBSD__ 6054126261Smlaier PF_UNLOCK(); 6055126261Smlaier#endif 6056126258Smlaier error = nd6_output(ifp, ifp, m0, dst, NULL); 6057127145Smlaier#ifdef __FreeBSD__ 6058126261Smlaier PF_LOCK(); 6059126261Smlaier#endif 6060126258Smlaier } else { 6061126258Smlaier in6_ifstat_inc(ifp, ifs6_in_toobig); 6062127145Smlaier#ifdef __FreeBSD__ 6063126261Smlaier if (r->rt != PF_DUPTO) { 6064126261Smlaier PF_UNLOCK(); 6065126261Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6066126261Smlaier PF_LOCK(); 6067126261Smlaier } else 6068126261Smlaier#else 6069126258Smlaier if (r->rt != PF_DUPTO) 6070126258Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6071126258Smlaier else 6072126261Smlaier#endif 6073126258Smlaier goto bad; 6074126258Smlaier } 6075126258Smlaier 6076126258Smlaierdone: 6077126258Smlaier if (r->rt != PF_DUPTO) 6078126258Smlaier *m = NULL; 6079126258Smlaier return; 6080126258Smlaier 6081126258Smlaierbad: 6082126258Smlaier m_freem(m0); 6083126258Smlaier goto done; 6084126258Smlaier} 6085126258Smlaier#endif /* INET6 */ 6086126258Smlaier 6087126258Smlaier 6088127145Smlaier#ifdef __FreeBSD__ 6089126258Smlaier/* 6090132566Smlaier * FreeBSD supports cksum offloads for the following drivers. 6091137413Sru * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6092132566Smlaier * ti(4), txp(4), xl(4) 6093132566Smlaier * 6094132566Smlaier * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6095132566Smlaier * network driver performed cksum including pseudo header, need to verify 6096132566Smlaier * csum_data 6097132566Smlaier * CSUM_DATA_VALID : 6098132566Smlaier * network driver performed cksum, needs to additional pseudo header 6099132566Smlaier * cksum computation with partial csum_data(i.e. lack of H/W support for 6100132566Smlaier * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6101132566Smlaier * 6102132566Smlaier * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6103132566Smlaier * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6104132566Smlaier * TCP/UDP layer. 6105132566Smlaier * Also, set csum_data to 0xffff to force cksum validation. 6106126261Smlaier */ 6107126261Smlaierint 6108126261Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6109126261Smlaier{ 6110126261Smlaier u_int16_t sum = 0; 6111126261Smlaier int hw_assist = 0; 6112126261Smlaier struct ip *ip; 6113126261Smlaier 6114126261Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6115126261Smlaier return (1); 6116126261Smlaier if (m->m_pkthdr.len < off + len) 6117126261Smlaier return (1); 6118126261Smlaier 6119126261Smlaier switch (p) { 6120126261Smlaier case IPPROTO_TCP: 6121126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6122126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6123126261Smlaier sum = m->m_pkthdr.csum_data; 6124126261Smlaier } else { 6125126261Smlaier ip = mtod(m, struct ip *); 6126126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6127135078Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6128135078Smlaier m->m_pkthdr.csum_data + IPPROTO_TCP)); 6129126261Smlaier } 6130126261Smlaier sum ^= 0xffff; 6131126261Smlaier ++hw_assist; 6132126261Smlaier } 6133126261Smlaier break; 6134126261Smlaier case IPPROTO_UDP: 6135126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6136126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6137126261Smlaier sum = m->m_pkthdr.csum_data; 6138126261Smlaier } else { 6139126261Smlaier ip = mtod(m, struct ip *); 6140126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6141126261Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6142126261Smlaier m->m_pkthdr.csum_data + IPPROTO_UDP)); 6143126261Smlaier } 6144126261Smlaier sum ^= 0xffff; 6145126261Smlaier ++hw_assist; 6146126261Smlaier } 6147126261Smlaier break; 6148126261Smlaier case IPPROTO_ICMP: 6149126261Smlaier#ifdef INET6 6150126261Smlaier case IPPROTO_ICMPV6: 6151126261Smlaier#endif /* INET6 */ 6152126261Smlaier break; 6153126261Smlaier default: 6154126261Smlaier return (1); 6155126261Smlaier } 6156126261Smlaier 6157126261Smlaier if (!hw_assist) { 6158126261Smlaier switch (af) { 6159126261Smlaier case AF_INET: 6160126261Smlaier if (p == IPPROTO_ICMP) { 6161126261Smlaier if (m->m_len < off) 6162126261Smlaier return (1); 6163126261Smlaier m->m_data += off; 6164126261Smlaier m->m_len -= off; 6165126261Smlaier sum = in_cksum(m, len); 6166126261Smlaier m->m_data -= off; 6167126261Smlaier m->m_len += off; 6168126261Smlaier } else { 6169126261Smlaier if (m->m_len < sizeof(struct ip)) 6170126261Smlaier return (1); 6171126261Smlaier sum = in4_cksum(m, p, off, len); 6172126261Smlaier } 6173126261Smlaier break; 6174126261Smlaier#ifdef INET6 6175126261Smlaier case AF_INET6: 6176126261Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6177126261Smlaier return (1); 6178126261Smlaier sum = in6_cksum(m, p, off, len); 6179126261Smlaier break; 6180126261Smlaier#endif /* INET6 */ 6181126261Smlaier default: 6182126261Smlaier return (1); 6183126261Smlaier } 6184126261Smlaier } 6185126261Smlaier if (sum) { 6186126261Smlaier switch (p) { 6187126261Smlaier case IPPROTO_TCP: 6188126261Smlaier tcpstat.tcps_rcvbadsum++; 6189126261Smlaier break; 6190126261Smlaier case IPPROTO_UDP: 6191126261Smlaier udpstat.udps_badsum++; 6192126261Smlaier break; 6193126261Smlaier case IPPROTO_ICMP: 6194126261Smlaier icmpstat.icps_checksum++; 6195126261Smlaier break; 6196126261Smlaier#ifdef INET6 6197126261Smlaier case IPPROTO_ICMPV6: 6198126261Smlaier icmp6stat.icp6s_checksum++; 6199126261Smlaier break; 6200126261Smlaier#endif /* INET6 */ 6201126261Smlaier } 6202126261Smlaier return (1); 6203132566Smlaier } else { 6204132566Smlaier if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6205132566Smlaier m->m_pkthdr.csum_flags |= 6206132566Smlaier (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6207132566Smlaier m->m_pkthdr.csum_data = 0xffff; 6208132566Smlaier } 6209126261Smlaier } 6210126261Smlaier return (0); 6211126261Smlaier} 6212126261Smlaier#else 6213126261Smlaier/* 6214126258Smlaier * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6215126258Smlaier * off is the offset where the protocol header starts 6216126258Smlaier * len is the total length of protocol header plus payload 6217126258Smlaier * returns 0 when the checksum is valid, otherwise returns 1. 6218126258Smlaier */ 6219126258Smlaierint 6220130613Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6221130613Smlaier sa_family_t af) 6222126258Smlaier{ 6223126258Smlaier u_int16_t flag_ok, flag_bad; 6224126258Smlaier u_int16_t sum; 6225126258Smlaier 6226126258Smlaier switch (p) { 6227126258Smlaier case IPPROTO_TCP: 6228126258Smlaier flag_ok = M_TCP_CSUM_IN_OK; 6229126258Smlaier flag_bad = M_TCP_CSUM_IN_BAD; 6230126258Smlaier break; 6231126258Smlaier case IPPROTO_UDP: 6232126258Smlaier flag_ok = M_UDP_CSUM_IN_OK; 6233126258Smlaier flag_bad = M_UDP_CSUM_IN_BAD; 6234126258Smlaier break; 6235126258Smlaier case IPPROTO_ICMP: 6236126258Smlaier#ifdef INET6 6237126258Smlaier case IPPROTO_ICMPV6: 6238126258Smlaier#endif /* INET6 */ 6239126258Smlaier flag_ok = flag_bad = 0; 6240126258Smlaier break; 6241126258Smlaier default: 6242126258Smlaier return (1); 6243126258Smlaier } 6244126258Smlaier if (m->m_pkthdr.csum & flag_ok) 6245126258Smlaier return (0); 6246126258Smlaier if (m->m_pkthdr.csum & flag_bad) 6247126258Smlaier return (1); 6248126258Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6249126258Smlaier return (1); 6250126258Smlaier if (m->m_pkthdr.len < off + len) 6251126258Smlaier return (1); 6252145836Smlaier switch (af) { 6253145836Smlaier#ifdef INET 6254126258Smlaier case AF_INET: 6255126258Smlaier if (p == IPPROTO_ICMP) { 6256126258Smlaier if (m->m_len < off) 6257126258Smlaier return (1); 6258126258Smlaier m->m_data += off; 6259126258Smlaier m->m_len -= off; 6260126258Smlaier sum = in_cksum(m, len); 6261126258Smlaier m->m_data -= off; 6262126258Smlaier m->m_len += off; 6263126258Smlaier } else { 6264126258Smlaier if (m->m_len < sizeof(struct ip)) 6265126258Smlaier return (1); 6266126258Smlaier sum = in4_cksum(m, p, off, len); 6267126258Smlaier } 6268126258Smlaier break; 6269145836Smlaier#endif /* INET */ 6270126258Smlaier#ifdef INET6 6271126258Smlaier case AF_INET6: 6272126258Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6273126258Smlaier return (1); 6274126258Smlaier sum = in6_cksum(m, p, off, len); 6275126258Smlaier break; 6276126258Smlaier#endif /* INET6 */ 6277126258Smlaier default: 6278126258Smlaier return (1); 6279126258Smlaier } 6280126258Smlaier if (sum) { 6281126258Smlaier m->m_pkthdr.csum |= flag_bad; 6282126258Smlaier switch (p) { 6283126258Smlaier case IPPROTO_TCP: 6284126258Smlaier tcpstat.tcps_rcvbadsum++; 6285126258Smlaier break; 6286126258Smlaier case IPPROTO_UDP: 6287126258Smlaier udpstat.udps_badsum++; 6288126258Smlaier break; 6289126258Smlaier case IPPROTO_ICMP: 6290126258Smlaier icmpstat.icps_checksum++; 6291126258Smlaier break; 6292126258Smlaier#ifdef INET6 6293126258Smlaier case IPPROTO_ICMPV6: 6294126258Smlaier icmp6stat.icp6s_checksum++; 6295126258Smlaier break; 6296126258Smlaier#endif /* INET6 */ 6297126258Smlaier } 6298126258Smlaier return (1); 6299126258Smlaier } 6300126258Smlaier m->m_pkthdr.csum |= flag_ok; 6301126258Smlaier return (0); 6302126258Smlaier} 6303126261Smlaier#endif 6304126258Smlaier 6305130613Smlaierstatic int 6306130613Smlaierpf_add_mbuf_tag(struct mbuf *m, u_int tag) 6307130613Smlaier{ 6308130613Smlaier struct m_tag *mtag; 6309130613Smlaier 6310130613Smlaier if (m_tag_find(m, tag, NULL) != NULL) 6311130613Smlaier return (0); 6312130613Smlaier mtag = m_tag_get(tag, 0, M_NOWAIT); 6313130613Smlaier if (mtag == NULL) 6314130613Smlaier return (1); 6315130613Smlaier m_tag_prepend(m, mtag); 6316130613Smlaier return (0); 6317130613Smlaier} 6318130613Smlaier 6319126258Smlaier#ifdef INET 6320126258Smlaierint 6321135920Smlaier#ifdef __FreeBSD__ 6322145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6323145836Smlaier struct ether_header *eh, struct inpcb *inp) 6324135920Smlaier#else 6325145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6326145836Smlaier struct ether_header *eh) 6327135920Smlaier#endif 6328126258Smlaier{ 6329130613Smlaier struct pfi_kif *kif; 6330130613Smlaier u_short action, reason = 0, log = 0; 6331130613Smlaier struct mbuf *m = *m0; 6332130613Smlaier struct ip *h = NULL; /* make the compiler happy */ 6333130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6334130613Smlaier struct pf_state *s = NULL; 6335130613Smlaier struct pf_ruleset *ruleset = NULL; 6336130613Smlaier struct pf_pdesc pd; 6337130613Smlaier int off, dirndx, pqid = 0; 6338126258Smlaier 6339127145Smlaier#ifdef __FreeBSD__ 6340126261Smlaier PF_LOCK(); 6341126261Smlaier#endif 6342126258Smlaier if (!pf_status.running || 6343127145Smlaier#ifdef __FreeBSD__ 6344132280Smlaier (m->m_flags & M_SKIP_FIREWALL)) { 6345126261Smlaier PF_UNLOCK(); 6346132280Smlaier#else 6347132280Smlaier (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) { 6348126261Smlaier#endif 6349126261Smlaier return (PF_PASS); 6350126261Smlaier } 6351126258Smlaier 6352145836Smlaier#ifdef __FreeBSD__ 6353145836Smlaier /* XXX_IMPORT: later */ 6354145836Smlaier#else 6355145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6356145836Smlaier ifp = ifp->if_carpdev; 6357145836Smlaier#endif 6358145836Smlaier 6359130613Smlaier kif = pfi_index2kif[ifp->if_index]; 6360130613Smlaier if (kif == NULL) { 6361130613Smlaier#ifdef __FreeBSD__ 6362130613Smlaier PF_UNLOCK(); 6363130613Smlaier#endif 6364145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6365145836Smlaier ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6366130613Smlaier return (PF_DROP); 6367130613Smlaier } 6368145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6369145836Smlaier#ifdef __FreeBSD__ 6370145836Smlaier PF_UNLOCK(); 6371145836Smlaier#endif 6372145836Smlaier return (PF_PASS); 6373145836Smlaier } 6374130613Smlaier 6375130613Smlaier#ifdef __FreeBSD__ 6376126261Smlaier M_ASSERTPKTHDR(m); 6377126261Smlaier#else 6378126258Smlaier#ifdef DIAGNOSTIC 6379126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 6380126258Smlaier panic("non-M_PKTHDR is passed to pf_test"); 6381145836Smlaier#endif /* DIAGNOSTIC */ 6382145836Smlaier#endif /* __FreeBSD__ */ 6383126258Smlaier 6384130613Smlaier memset(&pd, 0, sizeof(pd)); 6385126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 6386126258Smlaier action = PF_DROP; 6387126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6388126258Smlaier log = 1; 6389126258Smlaier goto done; 6390126258Smlaier } 6391126258Smlaier 6392126258Smlaier /* We do IP header normalization and packet reassembly here */ 6393145836Smlaier if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6394126258Smlaier action = PF_DROP; 6395126258Smlaier goto done; 6396126258Smlaier } 6397126258Smlaier m = *m0; 6398126258Smlaier h = mtod(m, struct ip *); 6399126258Smlaier 6400126258Smlaier off = h->ip_hl << 2; 6401126258Smlaier if (off < (int)sizeof(*h)) { 6402126258Smlaier action = PF_DROP; 6403126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6404126258Smlaier log = 1; 6405126258Smlaier goto done; 6406126258Smlaier } 6407126258Smlaier 6408126258Smlaier pd.src = (struct pf_addr *)&h->ip_src; 6409126258Smlaier pd.dst = (struct pf_addr *)&h->ip_dst; 6410130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 6411126258Smlaier pd.ip_sum = &h->ip_sum; 6412126258Smlaier pd.proto = h->ip_p; 6413126258Smlaier pd.af = AF_INET; 6414126258Smlaier pd.tos = h->ip_tos; 6415126258Smlaier pd.tot_len = ntohs(h->ip_len); 6416145836Smlaier pd.eh = eh; 6417126258Smlaier 6418126258Smlaier /* handle fragments that didn't get reassembled by normalization */ 6419126258Smlaier if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6420130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 6421126258Smlaier &pd, &a, &ruleset); 6422126258Smlaier goto done; 6423126258Smlaier } 6424126258Smlaier 6425126258Smlaier switch (h->ip_p) { 6426126258Smlaier 6427126258Smlaier case IPPROTO_TCP: { 6428126258Smlaier struct tcphdr th; 6429126258Smlaier 6430126258Smlaier pd.hdr.tcp = &th; 6431126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 6432126258Smlaier &action, &reason, AF_INET)) { 6433126258Smlaier log = action != PF_PASS; 6434126258Smlaier goto done; 6435126258Smlaier } 6436126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6437126258Smlaier ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 6438126258Smlaier action = PF_DROP; 6439126258Smlaier goto done; 6440126258Smlaier } 6441126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 6442126258Smlaier if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6443126258Smlaier pqid = 1; 6444130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6445126258Smlaier if (action == PF_DROP) 6446130613Smlaier goto done; 6447130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6448126258Smlaier &reason); 6449126258Smlaier if (action == PF_PASS) { 6450130613Smlaier#if NPFSYNC 6451130613Smlaier pfsync_update_state(s); 6452145836Smlaier#endif /* NPFSYNC */ 6453126258Smlaier r = s->rule.ptr; 6454130613Smlaier a = s->anchor.ptr; 6455126258Smlaier log = s->log; 6456126258Smlaier } else if (s == NULL) 6457135920Smlaier#ifdef __FreeBSD__ 6458130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6459145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6460135920Smlaier#else 6461135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6462145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6463135920Smlaier#endif 6464126258Smlaier break; 6465126258Smlaier } 6466126258Smlaier 6467126258Smlaier case IPPROTO_UDP: { 6468126258Smlaier struct udphdr uh; 6469126258Smlaier 6470126258Smlaier pd.hdr.udp = &uh; 6471126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6472126258Smlaier &action, &reason, AF_INET)) { 6473126258Smlaier log = action != PF_PASS; 6474126258Smlaier goto done; 6475126258Smlaier } 6476126258Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6477126258Smlaier off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 6478126258Smlaier action = PF_DROP; 6479126258Smlaier goto done; 6480126258Smlaier } 6481130613Smlaier if (uh.uh_dport == 0 || 6482130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6483130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6484130613Smlaier action = PF_DROP; 6485130613Smlaier goto done; 6486130613Smlaier } 6487130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6488126258Smlaier if (action == PF_PASS) { 6489130613Smlaier#if NPFSYNC 6490130613Smlaier pfsync_update_state(s); 6491145836Smlaier#endif /* NPFSYNC */ 6492126258Smlaier r = s->rule.ptr; 6493126258Smlaier a = s->anchor.ptr; 6494126258Smlaier log = s->log; 6495126258Smlaier } else if (s == NULL) 6496135920Smlaier#ifdef __FreeBSD__ 6497130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 6498145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6499135920Smlaier#else 6500135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 6501145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6502135920Smlaier#endif 6503126258Smlaier break; 6504126258Smlaier } 6505126258Smlaier 6506126258Smlaier case IPPROTO_ICMP: { 6507126258Smlaier struct icmp ih; 6508126258Smlaier 6509126258Smlaier pd.hdr.icmp = &ih; 6510126258Smlaier if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6511126258Smlaier &action, &reason, AF_INET)) { 6512126258Smlaier log = action != PF_PASS; 6513126258Smlaier goto done; 6514126258Smlaier } 6515126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6516126258Smlaier ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 6517126258Smlaier action = PF_DROP; 6518126258Smlaier goto done; 6519126258Smlaier } 6520145836Smlaier action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6521145836Smlaier &reason); 6522126258Smlaier if (action == PF_PASS) { 6523130613Smlaier#if NPFSYNC 6524130613Smlaier pfsync_update_state(s); 6525145836Smlaier#endif /* NPFSYNC */ 6526126258Smlaier r = s->rule.ptr; 6527126258Smlaier a = s->anchor.ptr; 6528126258Smlaier log = s->log; 6529126258Smlaier } else if (s == NULL) 6530145836Smlaier#ifdef __FreeBSD__ 6531130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6532145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 6533145836Smlaier#else 6534145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6535145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6536145836Smlaier#endif 6537126258Smlaier break; 6538126258Smlaier } 6539126258Smlaier 6540126258Smlaier default: 6541130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 6542126258Smlaier if (action == PF_PASS) { 6543130613Smlaier#if NPFSYNC 6544130613Smlaier pfsync_update_state(s); 6545145836Smlaier#endif /* NPFSYNC */ 6546126258Smlaier r = s->rule.ptr; 6547126258Smlaier a = s->anchor.ptr; 6548126258Smlaier log = s->log; 6549126258Smlaier } else if (s == NULL) 6550145836Smlaier#ifdef __FreeBSD__ 6551130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6552145836Smlaier &pd, &a, &ruleset, NULL); 6553145836Smlaier#else 6554145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6555145836Smlaier &pd, &a, &ruleset, &ipintrq); 6556145836Smlaier#endif 6557126258Smlaier break; 6558126258Smlaier } 6559126258Smlaier 6560126258Smlaierdone: 6561126258Smlaier if (action == PF_PASS && h->ip_hl > 5 && 6562126258Smlaier !((s && s->allow_opts) || r->allow_opts)) { 6563126258Smlaier action = PF_DROP; 6564145836Smlaier REASON_SET(&reason, PFRES_IPOPTIONS); 6565126258Smlaier log = 1; 6566126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 6567126258Smlaier ("pf: dropping packet with ip options\n")); 6568126258Smlaier } 6569126258Smlaier 6570145836Smlaier if (s && s->tag) 6571145836Smlaier pf_tag_packet(m, pf_get_tag(m), s->tag); 6572145836Smlaier 6573126258Smlaier#ifdef ALTQ 6574126258Smlaier if (action == PF_PASS && r->qid) { 6575126258Smlaier struct m_tag *mtag; 6576126258Smlaier struct altq_tag *atag; 6577126258Smlaier 6578126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 6579126258Smlaier if (mtag != NULL) { 6580126258Smlaier atag = (struct altq_tag *)(mtag + 1); 6581126258Smlaier if (pqid || pd.tos == IPTOS_LOWDELAY) 6582126258Smlaier atag->qid = r->pqid; 6583126258Smlaier else 6584126258Smlaier atag->qid = r->qid; 6585126258Smlaier /* add hints for ecn */ 6586126258Smlaier atag->af = AF_INET; 6587126258Smlaier atag->hdr = h; 6588126258Smlaier m_tag_prepend(m, mtag); 6589126258Smlaier } 6590126258Smlaier } 6591145836Smlaier#endif /* ALTQ */ 6592126258Smlaier 6593130613Smlaier /* 6594130613Smlaier * connections redirected to loopback should not match sockets 6595130613Smlaier * bound specifically to loopback due to security implications, 6596130613Smlaier * see tcp_input() and in_pcblookup_listen(). 6597130613Smlaier */ 6598130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6599130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6600130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 6601130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 6602130613Smlaier (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET && 6603130613Smlaier pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) { 6604130613Smlaier action = PF_DROP; 6605130613Smlaier REASON_SET(&reason, PFRES_MEMORY); 6606130613Smlaier } 6607130613Smlaier 6608126258Smlaier if (log) 6609130613Smlaier PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset); 6610126258Smlaier 6611130613Smlaier kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6612130613Smlaier kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6613130613Smlaier 6614130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 6615130613Smlaier r->packets++; 6616130613Smlaier r->bytes += pd.tot_len; 6617130613Smlaier if (a != NULL) { 6618130613Smlaier a->packets++; 6619130613Smlaier a->bytes += pd.tot_len; 6620130613Smlaier } 6621130613Smlaier if (s != NULL) { 6622130613Smlaier dirndx = (dir == s->direction) ? 0 : 1; 6623130613Smlaier s->packets[dirndx]++; 6624130613Smlaier s->bytes[dirndx] += pd.tot_len; 6625130613Smlaier if (s->nat_rule.ptr != NULL) { 6626130613Smlaier s->nat_rule.ptr->packets++; 6627130613Smlaier s->nat_rule.ptr->bytes += pd.tot_len; 6628130613Smlaier } 6629130613Smlaier if (s->src_node != NULL) { 6630130613Smlaier s->src_node->packets++; 6631130613Smlaier s->src_node->bytes += pd.tot_len; 6632130613Smlaier } 6633130613Smlaier if (s->nat_src_node != NULL) { 6634130613Smlaier s->nat_src_node->packets++; 6635130613Smlaier s->nat_src_node->bytes += pd.tot_len; 6636130613Smlaier } 6637130613Smlaier } 6638130613Smlaier tr = r; 6639130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6640130613Smlaier if (nr != NULL) { 6641130613Smlaier struct pf_addr *x; 6642130613Smlaier /* 6643130613Smlaier * XXX: we need to make sure that the addresses 6644130613Smlaier * passed to pfr_update_stats() are the same than 6645130613Smlaier * the addresses used during matching (pfr_match) 6646130613Smlaier */ 6647130613Smlaier if (r == &pf_default_rule) { 6648130613Smlaier tr = nr; 6649130613Smlaier x = (s == NULL || s->direction == dir) ? 6650130613Smlaier &pd.baddr : &pd.naddr; 6651130613Smlaier } else 6652130613Smlaier x = (s == NULL || s->direction == dir) ? 6653130613Smlaier &pd.naddr : &pd.baddr; 6654130613Smlaier if (x == &pd.baddr || s == NULL) { 6655130613Smlaier /* we need to change the address */ 6656130613Smlaier if (dir == PF_OUT) 6657130613Smlaier pd.src = x; 6658130613Smlaier else 6659130613Smlaier pd.dst = x; 6660130613Smlaier } 6661130613Smlaier } 6662130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 6663130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 6664130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 6665130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6666145836Smlaier tr->src.neg); 6667130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 6668130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 6669130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 6670130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6671145836Smlaier tr->dst.neg); 6672130613Smlaier } 6673130613Smlaier 6674130613Smlaier 6675126258Smlaier if (action == PF_SYNPROXY_DROP) { 6676126258Smlaier m_freem(*m0); 6677126258Smlaier *m0 = NULL; 6678126258Smlaier action = PF_PASS; 6679126258Smlaier } else if (r->rt) 6680126258Smlaier /* pf_route can free the mbuf causing *m0 to become NULL */ 6681126258Smlaier pf_route(m0, r, dir, ifp, s); 6682126258Smlaier 6683127145Smlaier#ifdef __FreeBSD__ 6684126261Smlaier PF_UNLOCK(); 6685126261Smlaier#endif 6686126261Smlaier 6687126258Smlaier return (action); 6688126258Smlaier} 6689126258Smlaier#endif /* INET */ 6690126258Smlaier 6691126258Smlaier#ifdef INET6 6692126258Smlaierint 6693135920Smlaier#ifdef __FreeBSD__ 6694145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6695145836Smlaier struct ether_header *eh, struct inpcb *inp) 6696135920Smlaier#else 6697145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6698145836Smlaier struct ether_header *eh) 6699135920Smlaier#endif 6700126258Smlaier{ 6701130613Smlaier struct pfi_kif *kif; 6702130613Smlaier u_short action, reason = 0, log = 0; 6703130613Smlaier struct mbuf *m = *m0; 6704130613Smlaier struct ip6_hdr *h = NULL; /* make the compiler happy */ 6705130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6706130613Smlaier struct pf_state *s = NULL; 6707130613Smlaier struct pf_ruleset *ruleset = NULL; 6708130613Smlaier struct pf_pdesc pd; 6709130613Smlaier int off, terminal = 0, dirndx; 6710126258Smlaier 6711127145Smlaier#ifdef __FreeBSD__ 6712126261Smlaier PF_LOCK(); 6713126261Smlaier#endif 6714126261Smlaier 6715126258Smlaier if (!pf_status.running || 6716127145Smlaier#ifdef __FreeBSD__ 6717132280Smlaier (m->m_flags & M_SKIP_FIREWALL)) { 6718126261Smlaier PF_UNLOCK(); 6719132280Smlaier#else 6720132280Smlaier (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) { 6721126261Smlaier#endif 6722126258Smlaier return (PF_PASS); 6723126261Smlaier } 6724126258Smlaier 6725145836Smlaier#ifdef __FreeBSD__ 6726145836Smlaier /* XXX_IMPORT: later */ 6727145836Smlaier#else 6728145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6729145836Smlaier ifp = ifp->if_carpdev; 6730145836Smlaier#endif 6731145836Smlaier 6732130613Smlaier kif = pfi_index2kif[ifp->if_index]; 6733130613Smlaier if (kif == NULL) { 6734130613Smlaier#ifdef __FreeBSD__ 6735130613Smlaier PF_UNLOCK(); 6736130613Smlaier#endif 6737145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6738145836Smlaier ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6739130613Smlaier return (PF_DROP); 6740130613Smlaier } 6741145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6742145836Smlaier#ifdef __FreeBSD__ 6743145836Smlaier PF_UNLOCK(); 6744145836Smlaier#endif 6745145836Smlaier return (PF_PASS); 6746145836Smlaier } 6747130613Smlaier 6748130613Smlaier#ifdef __FreeBSD__ 6749126261Smlaier M_ASSERTPKTHDR(m); 6750126261Smlaier#else 6751126258Smlaier#ifdef DIAGNOSTIC 6752126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 6753145836Smlaier panic("non-M_PKTHDR is passed to pf_test6"); 6754145836Smlaier#endif /* DIAGNOSTIC */ 6755126258Smlaier#endif 6756126258Smlaier 6757130613Smlaier memset(&pd, 0, sizeof(pd)); 6758126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 6759126258Smlaier action = PF_DROP; 6760126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6761126258Smlaier log = 1; 6762126258Smlaier goto done; 6763126258Smlaier } 6764126258Smlaier 6765126258Smlaier /* We do IP header normalization and packet reassembly here */ 6766145836Smlaier if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6767126258Smlaier action = PF_DROP; 6768126258Smlaier goto done; 6769126258Smlaier } 6770126258Smlaier m = *m0; 6771126258Smlaier h = mtod(m, struct ip6_hdr *); 6772126258Smlaier 6773126258Smlaier pd.src = (struct pf_addr *)&h->ip6_src; 6774126258Smlaier pd.dst = (struct pf_addr *)&h->ip6_dst; 6775130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 6776126258Smlaier pd.ip_sum = NULL; 6777126258Smlaier pd.af = AF_INET6; 6778126258Smlaier pd.tos = 0; 6779126258Smlaier pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6780145836Smlaier pd.eh = eh; 6781126258Smlaier 6782126258Smlaier off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6783126258Smlaier pd.proto = h->ip6_nxt; 6784126258Smlaier do { 6785126258Smlaier switch (pd.proto) { 6786126258Smlaier case IPPROTO_FRAGMENT: 6787130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 6788126258Smlaier &pd, &a, &ruleset); 6789126258Smlaier if (action == PF_DROP) 6790126258Smlaier REASON_SET(&reason, PFRES_FRAG); 6791126258Smlaier goto done; 6792126258Smlaier case IPPROTO_AH: 6793126258Smlaier case IPPROTO_HOPOPTS: 6794126258Smlaier case IPPROTO_ROUTING: 6795126258Smlaier case IPPROTO_DSTOPTS: { 6796126258Smlaier /* get next header and header length */ 6797126258Smlaier struct ip6_ext opt6; 6798126258Smlaier 6799126258Smlaier if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6800145836Smlaier NULL, &reason, pd.af)) { 6801126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 6802126258Smlaier ("pf: IPv6 short opt\n")); 6803126258Smlaier action = PF_DROP; 6804126258Smlaier log = 1; 6805126258Smlaier goto done; 6806126258Smlaier } 6807126258Smlaier if (pd.proto == IPPROTO_AH) 6808126258Smlaier off += (opt6.ip6e_len + 2) * 4; 6809126258Smlaier else 6810126258Smlaier off += (opt6.ip6e_len + 1) * 8; 6811126258Smlaier pd.proto = opt6.ip6e_nxt; 6812126258Smlaier /* goto the next header */ 6813126258Smlaier break; 6814126258Smlaier } 6815126258Smlaier default: 6816126258Smlaier terminal++; 6817126258Smlaier break; 6818126258Smlaier } 6819126258Smlaier } while (!terminal); 6820126258Smlaier 6821126258Smlaier switch (pd.proto) { 6822126258Smlaier 6823126258Smlaier case IPPROTO_TCP: { 6824126258Smlaier struct tcphdr th; 6825126258Smlaier 6826126258Smlaier pd.hdr.tcp = &th; 6827126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 6828126258Smlaier &action, &reason, AF_INET6)) { 6829126258Smlaier log = action != PF_PASS; 6830126258Smlaier goto done; 6831126258Smlaier } 6832126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6833138387Sdhartmei ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 6834138387Sdhartmei IPPROTO_TCP, AF_INET6)) { 6835126258Smlaier action = PF_DROP; 6836145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6837126258Smlaier goto done; 6838126258Smlaier } 6839126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 6840130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6841126258Smlaier if (action == PF_DROP) 6842130613Smlaier goto done; 6843130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6844126258Smlaier &reason); 6845126258Smlaier if (action == PF_PASS) { 6846130613Smlaier#if NPFSYNC 6847130613Smlaier pfsync_update_state(s); 6848145836Smlaier#endif /* NPFSYNC */ 6849126258Smlaier r = s->rule.ptr; 6850130613Smlaier a = s->anchor.ptr; 6851126258Smlaier log = s->log; 6852126258Smlaier } else if (s == NULL) 6853135920Smlaier#ifdef __FreeBSD__ 6854130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6855145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6856135920Smlaier#else 6857135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6858145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 6859135920Smlaier#endif 6860126258Smlaier break; 6861126258Smlaier } 6862126258Smlaier 6863126258Smlaier case IPPROTO_UDP: { 6864126258Smlaier struct udphdr uh; 6865126258Smlaier 6866126258Smlaier pd.hdr.udp = &uh; 6867126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6868126258Smlaier &action, &reason, AF_INET6)) { 6869126258Smlaier log = action != PF_PASS; 6870126258Smlaier goto done; 6871126258Smlaier } 6872126258Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6873138387Sdhartmei off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 6874138387Sdhartmei IPPROTO_UDP, AF_INET6)) { 6875126258Smlaier action = PF_DROP; 6876145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6877126258Smlaier goto done; 6878126258Smlaier } 6879130613Smlaier if (uh.uh_dport == 0 || 6880130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6881130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6882130613Smlaier action = PF_DROP; 6883130613Smlaier goto done; 6884130613Smlaier } 6885130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6886126258Smlaier if (action == PF_PASS) { 6887130613Smlaier#if NPFSYNC 6888130613Smlaier pfsync_update_state(s); 6889145836Smlaier#endif /* NPFSYNC */ 6890126258Smlaier r = s->rule.ptr; 6891130613Smlaier a = s->anchor.ptr; 6892126258Smlaier log = s->log; 6893126258Smlaier } else if (s == NULL) 6894135920Smlaier#ifdef __FreeBSD__ 6895130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 6896145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6897135920Smlaier#else 6898135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 6899145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 6900135920Smlaier#endif 6901126258Smlaier break; 6902126258Smlaier } 6903126258Smlaier 6904126258Smlaier case IPPROTO_ICMPV6: { 6905126258Smlaier struct icmp6_hdr ih; 6906126258Smlaier 6907126258Smlaier pd.hdr.icmp6 = &ih; 6908126258Smlaier if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6909126258Smlaier &action, &reason, AF_INET6)) { 6910126258Smlaier log = action != PF_PASS; 6911126258Smlaier goto done; 6912126258Smlaier } 6913126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6914145836Smlaier ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 6915138387Sdhartmei IPPROTO_ICMPV6, AF_INET6)) { 6916126258Smlaier action = PF_DROP; 6917145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6918126258Smlaier goto done; 6919126258Smlaier } 6920130613Smlaier action = pf_test_state_icmp(&s, dir, kif, 6921145836Smlaier m, off, h, &pd, &reason); 6922126258Smlaier if (action == PF_PASS) { 6923130613Smlaier#if NPFSYNC 6924130613Smlaier pfsync_update_state(s); 6925145836Smlaier#endif /* NPFSYNC */ 6926126258Smlaier r = s->rule.ptr; 6927130613Smlaier a = s->anchor.ptr; 6928126258Smlaier log = s->log; 6929126258Smlaier } else if (s == NULL) 6930145836Smlaier#ifdef __FreeBSD__ 6931130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6932145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 6933145836Smlaier#else 6934145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6935145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 6936145836Smlaier#endif 6937126258Smlaier break; 6938126258Smlaier } 6939126258Smlaier 6940126258Smlaier default: 6941130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 6942130613Smlaier if (action == PF_PASS) { 6943145836Smlaier#if NPFSYNC 6944145836Smlaier pfsync_update_state(s); 6945145836Smlaier#endif /* NPFSYNC */ 6946130613Smlaier r = s->rule.ptr; 6947130613Smlaier a = s->anchor.ptr; 6948130613Smlaier log = s->log; 6949130613Smlaier } else if (s == NULL) 6950145836Smlaier#ifdef __FreeBSD__ 6951130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6952145836Smlaier &pd, &a, &ruleset, NULL); 6953145836Smlaier#else 6954145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6955145836Smlaier &pd, &a, &ruleset, &ip6intrq); 6956145836Smlaier#endif 6957126258Smlaier break; 6958126258Smlaier } 6959126258Smlaier 6960126258Smlaierdone: 6961126258Smlaier /* XXX handle IPv6 options, if not allowed. not implemented. */ 6962126258Smlaier 6963145836Smlaier if (s && s->tag) 6964145836Smlaier pf_tag_packet(m, pf_get_tag(m), s->tag); 6965145836Smlaier 6966126258Smlaier#ifdef ALTQ 6967126258Smlaier if (action == PF_PASS && r->qid) { 6968126258Smlaier struct m_tag *mtag; 6969126258Smlaier struct altq_tag *atag; 6970126258Smlaier 6971126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 6972126258Smlaier if (mtag != NULL) { 6973126258Smlaier atag = (struct altq_tag *)(mtag + 1); 6974126258Smlaier if (pd.tos == IPTOS_LOWDELAY) 6975126258Smlaier atag->qid = r->pqid; 6976126258Smlaier else 6977126258Smlaier atag->qid = r->qid; 6978126258Smlaier /* add hints for ecn */ 6979126258Smlaier atag->af = AF_INET6; 6980126258Smlaier atag->hdr = h; 6981126258Smlaier m_tag_prepend(m, mtag); 6982126258Smlaier } 6983126258Smlaier } 6984145836Smlaier#endif /* ALTQ */ 6985126258Smlaier 6986130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6987130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6988130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 6989130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 6990130613Smlaier IN6_IS_ADDR_LOOPBACK(&pd.dst->v6) && 6991130613Smlaier pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) { 6992130613Smlaier action = PF_DROP; 6993130613Smlaier REASON_SET(&reason, PFRES_MEMORY); 6994130613Smlaier } 6995130613Smlaier 6996126258Smlaier if (log) 6997130613Smlaier PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset); 6998126258Smlaier 6999130613Smlaier kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7000130613Smlaier kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7001130613Smlaier 7002130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 7003130613Smlaier r->packets++; 7004130613Smlaier r->bytes += pd.tot_len; 7005130613Smlaier if (a != NULL) { 7006130613Smlaier a->packets++; 7007130613Smlaier a->bytes += pd.tot_len; 7008130613Smlaier } 7009130613Smlaier if (s != NULL) { 7010130613Smlaier dirndx = (dir == s->direction) ? 0 : 1; 7011130613Smlaier s->packets[dirndx]++; 7012130613Smlaier s->bytes[dirndx] += pd.tot_len; 7013130613Smlaier if (s->nat_rule.ptr != NULL) { 7014130613Smlaier s->nat_rule.ptr->packets++; 7015130613Smlaier s->nat_rule.ptr->bytes += pd.tot_len; 7016130613Smlaier } 7017130613Smlaier if (s->src_node != NULL) { 7018130613Smlaier s->src_node->packets++; 7019130613Smlaier s->src_node->bytes += pd.tot_len; 7020130613Smlaier } 7021130613Smlaier if (s->nat_src_node != NULL) { 7022130613Smlaier s->nat_src_node->packets++; 7023130613Smlaier s->nat_src_node->bytes += pd.tot_len; 7024130613Smlaier } 7025130613Smlaier } 7026130613Smlaier tr = r; 7027130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7028130613Smlaier if (nr != NULL) { 7029130613Smlaier struct pf_addr *x; 7030130613Smlaier /* 7031130613Smlaier * XXX: we need to make sure that the addresses 7032130613Smlaier * passed to pfr_update_stats() are the same than 7033130613Smlaier * the addresses used during matching (pfr_match) 7034130613Smlaier */ 7035130613Smlaier if (r == &pf_default_rule) { 7036130613Smlaier tr = nr; 7037130613Smlaier x = (s == NULL || s->direction == dir) ? 7038130613Smlaier &pd.baddr : &pd.naddr; 7039130613Smlaier } else { 7040130613Smlaier x = (s == NULL || s->direction == dir) ? 7041130613Smlaier &pd.naddr : &pd.baddr; 7042130613Smlaier } 7043130613Smlaier if (x == &pd.baddr || s == NULL) { 7044130613Smlaier if (dir == PF_OUT) 7045130613Smlaier pd.src = x; 7046130613Smlaier else 7047130613Smlaier pd.dst = x; 7048130613Smlaier } 7049130613Smlaier } 7050130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 7051130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7052130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 7053130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7054145836Smlaier tr->src.neg); 7055130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 7056130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7057130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 7058130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7059145836Smlaier tr->dst.neg); 7060130613Smlaier } 7061130613Smlaier 7062130613Smlaier 7063126258Smlaier if (action == PF_SYNPROXY_DROP) { 7064126258Smlaier m_freem(*m0); 7065126258Smlaier *m0 = NULL; 7066126258Smlaier action = PF_PASS; 7067126258Smlaier } else if (r->rt) 7068126258Smlaier /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7069126258Smlaier pf_route6(m0, r, dir, ifp, s); 7070126258Smlaier 7071127145Smlaier#ifdef __FreeBSD__ 7072126261Smlaier PF_UNLOCK(); 7073126261Smlaier#endif 7074126258Smlaier return (action); 7075126258Smlaier} 7076126258Smlaier#endif /* INET6 */ 7077145836Smlaier 7078145836Smlaierint 7079145836Smlaierpf_check_congestion(struct ifqueue *ifq) 7080145836Smlaier{ 7081145836Smlaier#ifdef __FreeBSD__ 7082145836Smlaier /* XXX_IMPORT: later */ 7083145836Smlaier return (0); 7084145836Smlaier#else 7085145836Smlaier if (ifq->ifq_congestion) 7086145836Smlaier return (1); 7087145836Smlaier else 7088145836Smlaier return (0); 7089145836Smlaier#endif 7090145836Smlaier} 7091