pf.c revision 149884
1126261Smlaier/* $FreeBSD: head/sys/contrib/pf/net/pf.c 149884 2005-09-08 15:06:52Z 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" 47127145Smlaier#define NBPFILTER DEV_BPF 48127145Smlaier#define NPFLOG DEV_PFLOG 49127145Smlaier#define NPFSYNC DEV_PFSYNC 50126261Smlaier#else 51126258Smlaier#include "bpfilter.h" 52126258Smlaier#include "pflog.h" 53126258Smlaier#include "pfsync.h" 54126261Smlaier#endif 55126258Smlaier 56126258Smlaier#include <sys/param.h> 57126258Smlaier#include <sys/systm.h> 58126258Smlaier#include <sys/mbuf.h> 59126258Smlaier#include <sys/filio.h> 60126258Smlaier#include <sys/socket.h> 61126258Smlaier#include <sys/socketvar.h> 62126258Smlaier#include <sys/kernel.h> 63126258Smlaier#include <sys/time.h> 64127145Smlaier#ifdef __FreeBSD__ 65126261Smlaier#include <sys/sysctl.h> 66130613Smlaier#include <sys/endian.h> 67126261Smlaier#else 68126258Smlaier#include <sys/pool.h> 69126261Smlaier#endif 70126258Smlaier 71126258Smlaier#include <net/if.h> 72126258Smlaier#include <net/if_types.h> 73126258Smlaier#include <net/bpf.h> 74126258Smlaier#include <net/route.h> 75126258Smlaier 76126258Smlaier#include <netinet/in.h> 77126258Smlaier#include <netinet/in_var.h> 78126258Smlaier#include <netinet/in_systm.h> 79126258Smlaier#include <netinet/ip.h> 80126258Smlaier#include <netinet/ip_var.h> 81126258Smlaier#include <netinet/tcp.h> 82126258Smlaier#include <netinet/tcp_seq.h> 83126258Smlaier#include <netinet/udp.h> 84126258Smlaier#include <netinet/ip_icmp.h> 85126258Smlaier#include <netinet/in_pcb.h> 86126258Smlaier#include <netinet/tcp_timer.h> 87126258Smlaier#include <netinet/tcp_var.h> 88126258Smlaier#include <netinet/udp_var.h> 89126258Smlaier#include <netinet/icmp_var.h> 90145836Smlaier#include <netinet/if_ether.h> 91126258Smlaier 92127145Smlaier#ifndef __FreeBSD__ 93126258Smlaier#include <dev/rndvar.h> 94126261Smlaier#endif 95126258Smlaier#include <net/pfvar.h> 96126258Smlaier#include <net/if_pflog.h> 97130613Smlaier 98130613Smlaier#if NPFSYNC > 0 99126258Smlaier#include <net/if_pfsync.h> 100130613Smlaier#endif /* NPFSYNC > 0 */ 101126258Smlaier 102126258Smlaier#ifdef INET6 103126258Smlaier#include <netinet/ip6.h> 104126258Smlaier#include <netinet/in_pcb.h> 105126258Smlaier#include <netinet/icmp6.h> 106126258Smlaier#include <netinet6/nd6.h> 107127145Smlaier#ifdef __FreeBSD__ 108126261Smlaier#include <netinet6/ip6_var.h> 109126261Smlaier#include <netinet6/in6_pcb.h> 110126261Smlaier#endif 111126258Smlaier#endif /* INET6 */ 112126258Smlaier 113127145Smlaier#ifdef __FreeBSD__ 114126261Smlaier#include <machine/in_cksum.h> 115126261Smlaier#include <sys/limits.h> 116126261Smlaier#include <sys/ucred.h> 117126258Smlaier 118126261Smlaierextern int ip_optcopy(struct ip *, struct ip *); 119126261Smlaier#endif 120126261Smlaier 121126258Smlaier#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x 122126258Smlaier 123126258Smlaier/* 124126258Smlaier * Global variables 125126258Smlaier */ 126126258Smlaier 127145836Smlaierstruct pf_anchor_global pf_anchors; 128126258Smlaierstruct pf_ruleset pf_main_ruleset; 129126258Smlaierstruct pf_altqqueue pf_altqs[2]; 130126258Smlaierstruct pf_palist pf_pabuf; 131126258Smlaierstruct pf_altqqueue *pf_altqs_active; 132126258Smlaierstruct pf_altqqueue *pf_altqs_inactive; 133126258Smlaierstruct pf_status pf_status; 134126258Smlaier 135126258Smlaieru_int32_t ticket_altqs_active; 136126258Smlaieru_int32_t ticket_altqs_inactive; 137130613Smlaierint altqs_inactive_open; 138126258Smlaieru_int32_t ticket_pabuf; 139126258Smlaier 140127145Smlaier#ifdef __FreeBSD__ 141126261Smlaierstruct callout pf_expire_to; /* expire timeout */ 142126261Smlaier#else 143126258Smlaierstruct timeout pf_expire_to; /* expire timeout */ 144126261Smlaier#endif 145126258Smlaier 146145836Smlaierstruct pf_anchor_stackframe { 147145836Smlaier struct pf_ruleset *rs; 148145836Smlaier struct pf_rule *r; 149145836Smlaier struct pf_anchor_node *parent; 150145836Smlaier struct pf_anchor *child; 151145836Smlaier} pf_anchor_stack[64]; 152126261Smlaier 153127145Smlaier#ifdef __FreeBSD__ 154130613Smlaieruma_zone_t pf_src_tree_pl, pf_rule_pl; 155126261Smlaieruma_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 156126261Smlaier#else 157130613Smlaierstruct pool pf_src_tree_pl, pf_rule_pl; 158126258Smlaierstruct pool pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 159126261Smlaier#endif 160126258Smlaier 161126258Smlaiervoid pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 162126258Smlaier 163145836Smlaiervoid pf_init_threshold(struct pf_threshold *, u_int32_t, 164145836Smlaier u_int32_t); 165145836Smlaiervoid pf_add_threshold(struct pf_threshold *); 166145836Smlaierint pf_check_threshold(struct pf_threshold *); 167145836Smlaier 168126258Smlaiervoid pf_change_ap(struct pf_addr *, u_int16_t *, 169126258Smlaier u_int16_t *, u_int16_t *, struct pf_addr *, 170126258Smlaier u_int16_t, u_int8_t, sa_family_t); 171126258Smlaier#ifdef INET6 172126258Smlaiervoid pf_change_a6(struct pf_addr *, u_int16_t *, 173126258Smlaier struct pf_addr *, u_int8_t); 174126258Smlaier#endif /* INET6 */ 175126258Smlaiervoid pf_change_icmp(struct pf_addr *, u_int16_t *, 176126258Smlaier struct pf_addr *, struct pf_addr *, u_int16_t, 177126258Smlaier u_int16_t *, u_int16_t *, u_int16_t *, 178126258Smlaier u_int16_t *, u_int8_t, sa_family_t); 179126258Smlaiervoid pf_send_tcp(const struct pf_rule *, sa_family_t, 180126258Smlaier const struct pf_addr *, const struct pf_addr *, 181126258Smlaier u_int16_t, u_int16_t, u_int32_t, u_int32_t, 182145836Smlaier u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 183145836Smlaier struct ether_header *, struct ifnet *); 184126258Smlaiervoid pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 185126258Smlaier sa_family_t, struct pf_rule *); 186126258Smlaierstruct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 187130613Smlaier int, int, struct pfi_kif *, 188126258Smlaier struct pf_addr *, u_int16_t, struct pf_addr *, 189126258Smlaier u_int16_t, int); 190126258Smlaierstruct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 191130613Smlaier int, int, struct pfi_kif *, struct pf_src_node **, 192126258Smlaier struct pf_addr *, u_int16_t, 193126258Smlaier struct pf_addr *, u_int16_t, 194126258Smlaier struct pf_addr *, u_int16_t *); 195126258Smlaierint pf_test_tcp(struct pf_rule **, struct pf_state **, 196130613Smlaier int, struct pfi_kif *, struct mbuf *, int, 197126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 198135920Smlaier#ifdef __FreeBSD__ 199145836Smlaier struct pf_ruleset **, struct ifqueue *, 200145836Smlaier struct inpcb *); 201135920Smlaier#else 202145836Smlaier struct pf_ruleset **, struct ifqueue *); 203135920Smlaier#endif 204126258Smlaierint pf_test_udp(struct pf_rule **, struct pf_state **, 205130613Smlaier int, struct pfi_kif *, struct mbuf *, int, 206126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 207135920Smlaier#ifdef __FreeBSD__ 208145836Smlaier struct pf_ruleset **, struct ifqueue *, 209145836Smlaier struct inpcb *); 210135920Smlaier#else 211145836Smlaier struct pf_ruleset **, struct ifqueue *); 212135920Smlaier#endif 213126258Smlaierint pf_test_icmp(struct pf_rule **, struct pf_state **, 214130613Smlaier int, struct pfi_kif *, struct mbuf *, int, 215126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 216145836Smlaier struct pf_ruleset **, struct ifqueue *); 217126258Smlaierint pf_test_other(struct pf_rule **, struct pf_state **, 218130613Smlaier int, struct pfi_kif *, struct mbuf *, int, void *, 219126258Smlaier struct pf_pdesc *, struct pf_rule **, 220145836Smlaier struct pf_ruleset **, struct ifqueue *); 221126258Smlaierint pf_test_fragment(struct pf_rule **, int, 222130613Smlaier struct pfi_kif *, struct mbuf *, void *, 223126258Smlaier struct pf_pdesc *, struct pf_rule **, 224126258Smlaier struct pf_ruleset **); 225126258Smlaierint pf_test_state_tcp(struct pf_state **, int, 226130613Smlaier struct pfi_kif *, struct mbuf *, int, 227126258Smlaier void *, struct pf_pdesc *, u_short *); 228126258Smlaierint pf_test_state_udp(struct pf_state **, int, 229130613Smlaier struct pfi_kif *, struct mbuf *, int, 230126258Smlaier void *, struct pf_pdesc *); 231126258Smlaierint pf_test_state_icmp(struct pf_state **, int, 232130613Smlaier struct pfi_kif *, struct mbuf *, int, 233145836Smlaier void *, struct pf_pdesc *, u_short *); 234126258Smlaierint pf_test_state_other(struct pf_state **, int, 235130613Smlaier struct pfi_kif *, struct pf_pdesc *); 236126258Smlaierstruct pf_tag *pf_get_tag(struct mbuf *); 237126258Smlaierint pf_match_tag(struct mbuf *, struct pf_rule *, 238145836Smlaier struct pf_tag **, int *); 239126258Smlaiervoid pf_hash(struct pf_addr *, struct pf_addr *, 240126258Smlaier struct pf_poolhashkey *, sa_family_t); 241130613Smlaierint pf_map_addr(u_int8_t, struct pf_rule *, 242126258Smlaier struct pf_addr *, struct pf_addr *, 243130613Smlaier struct pf_addr *, struct pf_src_node **); 244130613Smlaierint pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 245126258Smlaier struct pf_addr *, struct pf_addr *, u_int16_t, 246130613Smlaier struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 247130613Smlaier struct pf_src_node **); 248126258Smlaiervoid pf_route(struct mbuf **, struct pf_rule *, int, 249126258Smlaier struct ifnet *, struct pf_state *); 250126258Smlaiervoid pf_route6(struct mbuf **, struct pf_rule *, int, 251126258Smlaier struct ifnet *, struct pf_state *); 252135920Smlaier#ifdef __FreeBSD__ 253130613Smlaierint pf_socket_lookup(uid_t *, gid_t *, 254135920Smlaier int, struct pf_pdesc *, struct inpcb *); 255135920Smlaier#else 256135920Smlaierint pf_socket_lookup(uid_t *, gid_t *, 257126258Smlaier int, struct pf_pdesc *); 258135920Smlaier#endif 259126258Smlaieru_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 260126258Smlaier sa_family_t); 261126258Smlaieru_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 262126258Smlaier sa_family_t); 263126258Smlaieru_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 264126258Smlaier u_int16_t); 265126258Smlaiervoid pf_set_rt_ifp(struct pf_state *, 266126258Smlaier struct pf_addr *); 267126258Smlaierint pf_check_proto_cksum(struct mbuf *, int, int, 268126258Smlaier u_int8_t, sa_family_t); 269126258Smlaierint pf_addr_wrap_neq(struct pf_addr_wrap *, 270126258Smlaier struct pf_addr_wrap *); 271130613Smlaierstatic int pf_add_mbuf_tag(struct mbuf *, u_int); 272130613Smlaierstruct pf_state *pf_find_state_recurse(struct pfi_kif *, 273130613Smlaier struct pf_state *, u_int8_t); 274145836Smlaierint pf_src_connlimit(struct pf_state **); 275145836Smlaierint pf_check_congestion(struct ifqueue *); 276126258Smlaier 277127145Smlaier#ifdef __FreeBSD__ 278126261Smlaierint in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 279126258Smlaier 280126261Smlaierstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX]; 281145836Smlaier 282126261Smlaier#else 283130613Smlaierstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 284130613Smlaier { &pf_state_pl, PFSTATE_HIWAT }, 285130613Smlaier { &pf_src_tree_pl, PFSNODE_HIWAT }, 286130613Smlaier { &pf_frent_pl, PFFRAG_FRENT_HIWAT } 287130613Smlaier}; 288126261Smlaier#endif 289126258Smlaier 290126258Smlaier#define STATE_LOOKUP() \ 291126258Smlaier do { \ 292126258Smlaier if (direction == PF_IN) \ 293145836Smlaier *state = pf_find_state_recurse( \ 294130613Smlaier kif, &key, PF_EXT_GWY); \ 295126258Smlaier else \ 296145836Smlaier *state = pf_find_state_recurse( \ 297130613Smlaier kif, &key, PF_LAN_EXT); \ 298145836Smlaier if (*state == NULL || (*state)->timeout == PFTM_PURGE) \ 299126258Smlaier return (PF_DROP); \ 300126258Smlaier if (direction == PF_OUT && \ 301126258Smlaier (((*state)->rule.ptr->rt == PF_ROUTETO && \ 302126258Smlaier (*state)->rule.ptr->direction == PF_OUT) || \ 303126258Smlaier ((*state)->rule.ptr->rt == PF_REPLYTO && \ 304126258Smlaier (*state)->rule.ptr->direction == PF_IN)) && \ 305130613Smlaier (*state)->rt_kif != NULL && \ 306130613Smlaier (*state)->rt_kif != kif) \ 307126258Smlaier return (PF_PASS); \ 308126258Smlaier } while (0) 309126258Smlaier 310126258Smlaier#define STATE_TRANSLATE(s) \ 311126258Smlaier (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ 312126258Smlaier ((s)->af == AF_INET6 && \ 313126258Smlaier ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ 314126258Smlaier (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ 315126258Smlaier (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ 316126258Smlaier (s)->lan.port != (s)->gwy.port 317126258Smlaier 318130613Smlaier#define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) : \ 319130613Smlaier ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent : \ 320130613Smlaier (k)->pfik_parent->pfik_parent) 321126258Smlaier 322145836Smlaier#define STATE_INC_COUNTERS(s) \ 323145836Smlaier do { \ 324145836Smlaier s->rule.ptr->states++; \ 325145836Smlaier if (s->anchor.ptr != NULL) \ 326145836Smlaier s->anchor.ptr->states++; \ 327145836Smlaier if (s->nat_rule.ptr != NULL) \ 328145836Smlaier s->nat_rule.ptr->states++; \ 329145836Smlaier } while (0) 330145836Smlaier 331145836Smlaier#define STATE_DEC_COUNTERS(s) \ 332145836Smlaier do { \ 333145836Smlaier if (s->nat_rule.ptr != NULL) \ 334145836Smlaier s->nat_rule.ptr->states--; \ 335145836Smlaier if (s->anchor.ptr != NULL) \ 336145836Smlaier s->anchor.ptr->states--; \ 337145836Smlaier s->rule.ptr->states--; \ 338145836Smlaier } while (0) 339145836Smlaier 340132767Skan#ifndef __FreeBSD__ 341130613Smlaierstatic __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 342130613Smlaierstatic __inline int pf_state_compare_lan_ext(struct pf_state *, 343130613Smlaier struct pf_state *); 344130613Smlaierstatic __inline int pf_state_compare_ext_gwy(struct pf_state *, 345130613Smlaier struct pf_state *); 346130613Smlaierstatic __inline int pf_state_compare_id(struct pf_state *, 347130613Smlaier struct pf_state *); 348145836Smlaierstatic __inline int pf_anchor_compare(struct pf_anchor *, struct pf_anchor *); 349132767Skan#else 350132767Skanstatic int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 351132767Skanstatic int pf_state_compare_lan_ext(struct pf_state *, 352132767Skan struct pf_state *); 353132767Skanstatic int pf_state_compare_ext_gwy(struct pf_state *, 354132767Skan struct pf_state *); 355132767Skanstatic int pf_state_compare_id(struct pf_state *, 356132767Skan struct pf_state *); 357145836Smlaierstatic int pf_anchor_compare(struct pf_anchor *, struct pf_anchor *); 358132767Skan#endif 359126258Smlaier 360130613Smlaierstruct pf_src_tree tree_src_tracking; 361130613Smlaier 362130613Smlaierstruct pf_state_tree_id tree_id; 363130613Smlaierstruct pf_state_queue state_updates; 364130613Smlaier 365130613SmlaierRB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 366130613SmlaierRB_GENERATE(pf_state_tree_lan_ext, pf_state, 367130613Smlaier u.s.entry_lan_ext, pf_state_compare_lan_ext); 368130613SmlaierRB_GENERATE(pf_state_tree_ext_gwy, pf_state, 369130613Smlaier u.s.entry_ext_gwy, pf_state_compare_ext_gwy); 370130613SmlaierRB_GENERATE(pf_state_tree_id, pf_state, 371130613Smlaier u.s.entry_id, pf_state_compare_id); 372145836SmlaierRB_GENERATE(pf_anchor_global, pf_anchor, entry_global, pf_anchor_compare); 373145836SmlaierRB_GENERATE(pf_anchor_node, pf_anchor, entry_node, pf_anchor_compare); 374130613Smlaier 375127145Smlaier#ifdef __FreeBSD__ 376126409Smlaierstatic int 377126409Smlaier#else 378126258Smlaierstatic __inline int 379126409Smlaier#endif 380130613Smlaierpf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 381126258Smlaier{ 382126258Smlaier int diff; 383126258Smlaier 384130613Smlaier if (a->rule.ptr > b->rule.ptr) 385130613Smlaier return (1); 386130613Smlaier if (a->rule.ptr < b->rule.ptr) 387130613Smlaier return (-1); 388130613Smlaier if ((diff = a->af - b->af) != 0) 389130613Smlaier return (diff); 390130613Smlaier switch (a->af) { 391130613Smlaier#ifdef INET 392130613Smlaier case AF_INET: 393130613Smlaier if (a->addr.addr32[0] > b->addr.addr32[0]) 394130613Smlaier return (1); 395130613Smlaier if (a->addr.addr32[0] < b->addr.addr32[0]) 396130613Smlaier return (-1); 397130613Smlaier break; 398130613Smlaier#endif /* INET */ 399130613Smlaier#ifdef INET6 400130613Smlaier case AF_INET6: 401130613Smlaier if (a->addr.addr32[3] > b->addr.addr32[3]) 402130613Smlaier return (1); 403130613Smlaier if (a->addr.addr32[3] < b->addr.addr32[3]) 404130613Smlaier return (-1); 405130613Smlaier if (a->addr.addr32[2] > b->addr.addr32[2]) 406130613Smlaier return (1); 407130613Smlaier if (a->addr.addr32[2] < b->addr.addr32[2]) 408130613Smlaier return (-1); 409130613Smlaier if (a->addr.addr32[1] > b->addr.addr32[1]) 410130613Smlaier return (1); 411130613Smlaier if (a->addr.addr32[1] < b->addr.addr32[1]) 412130613Smlaier return (-1); 413130613Smlaier if (a->addr.addr32[0] > b->addr.addr32[0]) 414130613Smlaier return (1); 415130613Smlaier if (a->addr.addr32[0] < b->addr.addr32[0]) 416130613Smlaier return (-1); 417130613Smlaier break; 418130613Smlaier#endif /* INET6 */ 419130613Smlaier } 420130613Smlaier return (0); 421130613Smlaier} 422130613Smlaier 423130613Smlaier#ifdef __FreeBSD__ 424130613Smlaierstatic int 425130613Smlaier#else 426130613Smlaierstatic __inline int 427130613Smlaier#endif 428130613Smlaierpf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b) 429130613Smlaier{ 430130613Smlaier int diff; 431130613Smlaier 432126258Smlaier if ((diff = a->proto - b->proto) != 0) 433126258Smlaier return (diff); 434126258Smlaier if ((diff = a->af - b->af) != 0) 435126258Smlaier return (diff); 436126258Smlaier switch (a->af) { 437126258Smlaier#ifdef INET 438126258Smlaier case AF_INET: 439130613Smlaier if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 440126258Smlaier return (1); 441130613Smlaier if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 442126258Smlaier return (-1); 443130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 444126258Smlaier return (1); 445130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 446126258Smlaier return (-1); 447126258Smlaier break; 448126258Smlaier#endif /* INET */ 449126258Smlaier#ifdef INET6 450126258Smlaier case AF_INET6: 451130613Smlaier if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 452126258Smlaier return (1); 453130613Smlaier if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 454126258Smlaier return (-1); 455130613Smlaier if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 456126258Smlaier return (1); 457130613Smlaier if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 458126258Smlaier return (-1); 459130613Smlaier if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 460126258Smlaier return (1); 461130613Smlaier if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 462126258Smlaier return (-1); 463130613Smlaier if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 464126258Smlaier return (1); 465130613Smlaier if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 466126258Smlaier return (-1); 467130613Smlaier if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 468126258Smlaier return (1); 469130613Smlaier if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 470126258Smlaier return (-1); 471130613Smlaier if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 472126258Smlaier return (1); 473130613Smlaier if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 474126258Smlaier return (-1); 475130613Smlaier if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 476126258Smlaier return (1); 477130613Smlaier if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 478126258Smlaier return (-1); 479130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 480126258Smlaier return (1); 481130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 482126258Smlaier return (-1); 483126258Smlaier break; 484126258Smlaier#endif /* INET6 */ 485126258Smlaier } 486126258Smlaier 487130613Smlaier if ((diff = a->lan.port - b->lan.port) != 0) 488126258Smlaier return (diff); 489130613Smlaier if ((diff = a->ext.port - b->ext.port) != 0) 490126258Smlaier return (diff); 491126258Smlaier 492126258Smlaier return (0); 493126258Smlaier} 494126258Smlaier 495130613Smlaier#ifdef __FreeBSD__ 496130613Smlaierstatic int 497130613Smlaier#else 498130613Smlaierstatic __inline int 499130613Smlaier#endif 500130613Smlaierpf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b) 501130613Smlaier{ 502130613Smlaier int diff; 503130613Smlaier 504130613Smlaier if ((diff = a->proto - b->proto) != 0) 505130613Smlaier return (diff); 506130613Smlaier if ((diff = a->af - b->af) != 0) 507130613Smlaier return (diff); 508130613Smlaier switch (a->af) { 509130613Smlaier#ifdef INET 510130613Smlaier case AF_INET: 511130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 512130613Smlaier return (1); 513130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 514130613Smlaier return (-1); 515130613Smlaier if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 516130613Smlaier return (1); 517130613Smlaier if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 518130613Smlaier return (-1); 519130613Smlaier break; 520130613Smlaier#endif /* INET */ 521126258Smlaier#ifdef INET6 522130613Smlaier case AF_INET6: 523130613Smlaier if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 524130613Smlaier return (1); 525130613Smlaier if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 526130613Smlaier return (-1); 527130613Smlaier if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 528130613Smlaier return (1); 529130613Smlaier if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 530130613Smlaier return (-1); 531130613Smlaier if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 532130613Smlaier return (1); 533130613Smlaier if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 534130613Smlaier return (-1); 535130613Smlaier if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 536130613Smlaier return (1); 537130613Smlaier if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 538130613Smlaier return (-1); 539130613Smlaier if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 540130613Smlaier return (1); 541130613Smlaier if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 542130613Smlaier return (-1); 543130613Smlaier if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 544130613Smlaier return (1); 545130613Smlaier if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 546130613Smlaier return (-1); 547130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 548130613Smlaier return (1); 549130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 550130613Smlaier return (-1); 551130613Smlaier if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 552130613Smlaier return (1); 553130613Smlaier if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 554130613Smlaier return (-1); 555130613Smlaier break; 556130613Smlaier#endif /* INET6 */ 557130613Smlaier } 558130613Smlaier 559130613Smlaier if ((diff = a->ext.port - b->ext.port) != 0) 560130613Smlaier return (diff); 561130613Smlaier if ((diff = a->gwy.port - b->gwy.port) != 0) 562130613Smlaier return (diff); 563130613Smlaier 564130613Smlaier return (0); 565130613Smlaier} 566130613Smlaier 567130613Smlaier#ifdef __FreeBSD__ 568130613Smlaierstatic int 569130613Smlaier#else 570130613Smlaierstatic __inline int 571130613Smlaier#endif 572130613Smlaierpf_state_compare_id(struct pf_state *a, struct pf_state *b) 573130613Smlaier{ 574130613Smlaier if (a->id > b->id) 575130613Smlaier return (1); 576130613Smlaier if (a->id < b->id) 577130613Smlaier return (-1); 578130613Smlaier if (a->creatorid > b->creatorid) 579130613Smlaier return (1); 580130613Smlaier if (a->creatorid < b->creatorid) 581130613Smlaier return (-1); 582130613Smlaier 583130613Smlaier return (0); 584130613Smlaier} 585130613Smlaier 586145836Smlaier#ifdef __FreeBSD__ 587145836Smlaierstatic int 588145836Smlaier#else 589145836Smlaierstatic __inline int 590145836Smlaier#endif 591145836Smlaierpf_anchor_compare(struct pf_anchor *a, struct pf_anchor *b) 592145836Smlaier{ 593145836Smlaier int c = strcmp(a->path, b->path); 594145836Smlaier 595145836Smlaier return (c ? (c < 0 ? -1 : 1) : 0); 596145836Smlaier} 597145836Smlaier 598130613Smlaier#ifdef INET6 599126258Smlaiervoid 600126258Smlaierpf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 601126258Smlaier{ 602126258Smlaier switch (af) { 603126258Smlaier#ifdef INET 604126258Smlaier case AF_INET: 605126258Smlaier dst->addr32[0] = src->addr32[0]; 606126258Smlaier break; 607126258Smlaier#endif /* INET */ 608126258Smlaier case AF_INET6: 609126258Smlaier dst->addr32[0] = src->addr32[0]; 610126258Smlaier dst->addr32[1] = src->addr32[1]; 611126258Smlaier dst->addr32[2] = src->addr32[2]; 612126258Smlaier dst->addr32[3] = src->addr32[3]; 613126258Smlaier break; 614126258Smlaier } 615126258Smlaier} 616145836Smlaier#endif /* INET6 */ 617126258Smlaier 618126258Smlaierstruct pf_state * 619130613Smlaierpf_find_state_byid(struct pf_state *key) 620126258Smlaier{ 621130613Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 622130613Smlaier return (RB_FIND(pf_state_tree_id, &tree_id, key)); 623130613Smlaier} 624126258Smlaier 625130613Smlaierstruct pf_state * 626130613Smlaierpf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree) 627130613Smlaier{ 628130613Smlaier struct pf_state *s; 629130613Smlaier 630126258Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 631130613Smlaier 632130613Smlaier switch (tree) { 633130613Smlaier case PF_LAN_EXT: 634130613Smlaier for (; kif != NULL; kif = kif->pfik_parent) { 635130613Smlaier s = RB_FIND(pf_state_tree_lan_ext, 636130613Smlaier &kif->pfik_lan_ext, key); 637130613Smlaier if (s != NULL) 638130613Smlaier return (s); 639130613Smlaier } 640126258Smlaier return (NULL); 641130613Smlaier case PF_EXT_GWY: 642130613Smlaier for (; kif != NULL; kif = kif->pfik_parent) { 643130613Smlaier s = RB_FIND(pf_state_tree_ext_gwy, 644130613Smlaier &kif->pfik_ext_gwy, key); 645130613Smlaier if (s != NULL) 646130613Smlaier return (s); 647130613Smlaier } 648130613Smlaier return (NULL); 649130613Smlaier default: 650130613Smlaier panic("pf_find_state_recurse"); 651130613Smlaier } 652126258Smlaier} 653126258Smlaier 654130613Smlaierstruct pf_state * 655130613Smlaierpf_find_state_all(struct pf_state *key, u_int8_t tree, int *more) 656130613Smlaier{ 657130613Smlaier struct pf_state *s, *ss = NULL; 658130613Smlaier struct pfi_kif *kif; 659130613Smlaier 660130613Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 661130613Smlaier 662130613Smlaier switch (tree) { 663130613Smlaier case PF_LAN_EXT: 664130613Smlaier TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 665130613Smlaier s = RB_FIND(pf_state_tree_lan_ext, 666130613Smlaier &kif->pfik_lan_ext, key); 667130613Smlaier if (s == NULL) 668130613Smlaier continue; 669130613Smlaier if (more == NULL) 670130613Smlaier return (s); 671130613Smlaier ss = s; 672130613Smlaier (*more)++; 673130613Smlaier } 674130613Smlaier return (ss); 675130613Smlaier case PF_EXT_GWY: 676130613Smlaier TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 677130613Smlaier s = RB_FIND(pf_state_tree_ext_gwy, 678130613Smlaier &kif->pfik_ext_gwy, key); 679130613Smlaier if (s == NULL) 680130613Smlaier continue; 681130613Smlaier if (more == NULL) 682130613Smlaier return (s); 683130613Smlaier ss = s; 684130613Smlaier (*more)++; 685130613Smlaier } 686130613Smlaier return (ss); 687130613Smlaier default: 688130613Smlaier panic("pf_find_state_all"); 689130613Smlaier } 690130613Smlaier} 691130613Smlaier 692145836Smlaiervoid 693145836Smlaierpf_init_threshold(struct pf_threshold *threshold, 694145836Smlaier u_int32_t limit, u_int32_t seconds) 695145836Smlaier{ 696145836Smlaier threshold->limit = limit * PF_THRESHOLD_MULT; 697145836Smlaier threshold->seconds = seconds; 698145836Smlaier threshold->count = 0; 699145836Smlaier threshold->last = time_second; 700145836Smlaier} 701145836Smlaier 702145836Smlaiervoid 703145836Smlaierpf_add_threshold(struct pf_threshold *threshold) 704145836Smlaier{ 705145836Smlaier u_int32_t t = time_second, diff = t - threshold->last; 706145836Smlaier 707145836Smlaier if (diff >= threshold->seconds) 708145836Smlaier threshold->count = 0; 709145836Smlaier else 710145836Smlaier threshold->count -= threshold->count * diff / 711145836Smlaier threshold->seconds; 712145836Smlaier threshold->count += PF_THRESHOLD_MULT; 713145836Smlaier threshold->last = t; 714145836Smlaier} 715145836Smlaier 716126258Smlaierint 717145836Smlaierpf_check_threshold(struct pf_threshold *threshold) 718145836Smlaier{ 719145836Smlaier return (threshold->count > threshold->limit); 720145836Smlaier} 721145836Smlaier 722145836Smlaierint 723145836Smlaierpf_src_connlimit(struct pf_state **state) 724145836Smlaier{ 725145836Smlaier struct pf_state *s; 726145836Smlaier int bad = 0; 727145836Smlaier 728145836Smlaier (*state)->src_node->conn++; 729145836Smlaier pf_add_threshold(&(*state)->src_node->conn_rate); 730145836Smlaier 731145836Smlaier if ((*state)->rule.ptr->max_src_conn && 732145836Smlaier (*state)->rule.ptr->max_src_conn < 733145836Smlaier (*state)->src_node->conn) { 734145836Smlaier pf_status.lcounters[LCNT_SRCCONN]++; 735145836Smlaier bad++; 736145836Smlaier } 737145836Smlaier 738145836Smlaier if ((*state)->rule.ptr->max_src_conn_rate.limit && 739145836Smlaier pf_check_threshold(&(*state)->src_node->conn_rate)) { 740145836Smlaier pf_status.lcounters[LCNT_SRCCONNRATE]++; 741145836Smlaier bad++; 742145836Smlaier } 743145836Smlaier 744145836Smlaier if (!bad) 745145836Smlaier return (0); 746145836Smlaier 747145836Smlaier if ((*state)->rule.ptr->overload_tbl) { 748145836Smlaier struct pfr_addr p; 749145836Smlaier u_int32_t killed = 0; 750145836Smlaier 751145836Smlaier pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 752145836Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 753145836Smlaier printf("pf_src_connlimit: blocking address "); 754145836Smlaier pf_print_host(&(*state)->src_node->addr, 0, 755145836Smlaier (*state)->af); 756145836Smlaier } 757145836Smlaier 758145836Smlaier bzero(&p, sizeof(p)); 759145836Smlaier p.pfra_af = (*state)->af; 760145836Smlaier switch ((*state)->af) { 761145836Smlaier#ifdef INET 762145836Smlaier case AF_INET: 763145836Smlaier p.pfra_net = 32; 764145836Smlaier p.pfra_ip4addr = (*state)->src_node->addr.v4; 765145836Smlaier break; 766145836Smlaier#endif /* INET */ 767145836Smlaier#ifdef INET6 768145836Smlaier case AF_INET6: 769145836Smlaier p.pfra_net = 128; 770145836Smlaier p.pfra_ip6addr = (*state)->src_node->addr.v6; 771145836Smlaier break; 772145836Smlaier#endif /* INET6 */ 773145836Smlaier } 774145836Smlaier 775145836Smlaier pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 776145836Smlaier &p, time_second); 777145836Smlaier 778145836Smlaier /* kill existing states if that's required. */ 779145836Smlaier if ((*state)->rule.ptr->flush) { 780145836Smlaier pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 781145836Smlaier 782145836Smlaier RB_FOREACH(s, pf_state_tree_id, &tree_id) { 783145836Smlaier /* 784145836Smlaier * Kill states from this source. (Only those 785145836Smlaier * from the same rule if PF_FLUSH_GLOBAL is not 786145836Smlaier * set) 787145836Smlaier */ 788145836Smlaier if (s->af == (*state)->af && 789145836Smlaier (((*state)->direction == PF_OUT && 790145836Smlaier PF_AEQ(&(*state)->src_node->addr, 791145836Smlaier &s->lan.addr, s->af)) || 792145836Smlaier ((*state)->direction == PF_IN && 793145836Smlaier PF_AEQ(&(*state)->src_node->addr, 794145836Smlaier &s->ext.addr, s->af))) && 795145836Smlaier ((*state)->rule.ptr->flush & 796145836Smlaier PF_FLUSH_GLOBAL || 797145836Smlaier (*state)->rule.ptr == s->rule.ptr)) { 798145836Smlaier s->timeout = PFTM_PURGE; 799145836Smlaier s->src.state = s->dst.state = 800145836Smlaier TCPS_CLOSED; 801145836Smlaier killed++; 802145836Smlaier } 803145836Smlaier } 804145836Smlaier if (pf_status.debug >= PF_DEBUG_MISC) 805145836Smlaier printf(", %u states killed", killed); 806145836Smlaier } 807145836Smlaier if (pf_status.debug >= PF_DEBUG_MISC) 808145836Smlaier printf("\n"); 809145836Smlaier } 810145836Smlaier 811145836Smlaier /* kill this state */ 812145836Smlaier (*state)->timeout = PFTM_PURGE; 813145836Smlaier (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 814145836Smlaier return (1); 815145836Smlaier} 816145836Smlaier 817145836Smlaierint 818130613Smlaierpf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 819130613Smlaier struct pf_addr *src, sa_family_t af) 820126258Smlaier{ 821130613Smlaier struct pf_src_node k; 822126258Smlaier 823130613Smlaier if (*sn == NULL) { 824130613Smlaier k.af = af; 825130613Smlaier PF_ACPY(&k.addr, src, af); 826130613Smlaier if (rule->rule_flag & PFRULE_RULESRCTRACK || 827130613Smlaier rule->rpool.opts & PF_POOL_STICKYADDR) 828130613Smlaier k.rule.ptr = rule; 829130613Smlaier else 830130613Smlaier k.rule.ptr = NULL; 831130613Smlaier pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 832130613Smlaier *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 833130613Smlaier } 834130613Smlaier if (*sn == NULL) { 835130613Smlaier if (!rule->max_src_nodes || 836130613Smlaier rule->src_nodes < rule->max_src_nodes) 837130613Smlaier (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 838145836Smlaier else 839145836Smlaier pf_status.lcounters[LCNT_SRCNODES]++; 840130613Smlaier if ((*sn) == NULL) 841130613Smlaier return (-1); 842130613Smlaier bzero(*sn, sizeof(struct pf_src_node)); 843145836Smlaier 844145836Smlaier pf_init_threshold(&(*sn)->conn_rate, 845145836Smlaier rule->max_src_conn_rate.limit, 846145836Smlaier rule->max_src_conn_rate.seconds); 847145836Smlaier 848130613Smlaier (*sn)->af = af; 849130613Smlaier if (rule->rule_flag & PFRULE_RULESRCTRACK || 850130613Smlaier rule->rpool.opts & PF_POOL_STICKYADDR) 851130613Smlaier (*sn)->rule.ptr = rule; 852130613Smlaier else 853130613Smlaier (*sn)->rule.ptr = NULL; 854130613Smlaier PF_ACPY(&(*sn)->addr, src, af); 855130613Smlaier if (RB_INSERT(pf_src_tree, 856130613Smlaier &tree_src_tracking, *sn) != NULL) { 857130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 858130613Smlaier printf("pf: src_tree insert failed: "); 859130613Smlaier pf_print_host(&(*sn)->addr, 0, af); 860130613Smlaier printf("\n"); 861130613Smlaier } 862130613Smlaier pool_put(&pf_src_tree_pl, *sn); 863130613Smlaier return (-1); 864130613Smlaier } 865130613Smlaier (*sn)->creation = time_second; 866130613Smlaier (*sn)->ruletype = rule->action; 867130613Smlaier if ((*sn)->rule.ptr != NULL) 868130613Smlaier (*sn)->rule.ptr->src_nodes++; 869130613Smlaier pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 870130613Smlaier pf_status.src_nodes++; 871130613Smlaier } else { 872130613Smlaier if (rule->max_src_states && 873145836Smlaier (*sn)->states >= rule->max_src_states) { 874145836Smlaier pf_status.lcounters[LCNT_SRCSTATES]++; 875130613Smlaier return (-1); 876145836Smlaier } 877130613Smlaier } 878130613Smlaier return (0); 879130613Smlaier} 880126258Smlaier 881130613Smlaierint 882130613Smlaierpf_insert_state(struct pfi_kif *kif, struct pf_state *state) 883130613Smlaier{ 884126258Smlaier /* Thou MUST NOT insert multiple duplicate keys */ 885130613Smlaier state->u.s.kif = kif; 886130613Smlaier if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) { 887126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 888126258Smlaier printf("pf: state insert failed: tree_lan_ext"); 889126258Smlaier printf(" lan: "); 890126258Smlaier pf_print_host(&state->lan.addr, state->lan.port, 891126258Smlaier state->af); 892126258Smlaier printf(" gwy: "); 893126258Smlaier pf_print_host(&state->gwy.addr, state->gwy.port, 894126258Smlaier state->af); 895126258Smlaier printf(" ext: "); 896126258Smlaier pf_print_host(&state->ext.addr, state->ext.port, 897126258Smlaier state->af); 898130613Smlaier if (state->sync_flags & PFSTATE_FROMSYNC) 899130613Smlaier printf(" (from sync)"); 900126258Smlaier printf("\n"); 901126258Smlaier } 902126258Smlaier return (-1); 903126258Smlaier } 904126258Smlaier 905130613Smlaier if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) { 906126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 907126258Smlaier printf("pf: state insert failed: tree_ext_gwy"); 908126258Smlaier printf(" lan: "); 909126258Smlaier pf_print_host(&state->lan.addr, state->lan.port, 910126258Smlaier state->af); 911126258Smlaier printf(" gwy: "); 912126258Smlaier pf_print_host(&state->gwy.addr, state->gwy.port, 913126258Smlaier state->af); 914126258Smlaier printf(" ext: "); 915126258Smlaier pf_print_host(&state->ext.addr, state->ext.port, 916126258Smlaier state->af); 917130613Smlaier if (state->sync_flags & PFSTATE_FROMSYNC) 918130613Smlaier printf(" (from sync)"); 919126258Smlaier printf("\n"); 920126258Smlaier } 921130613Smlaier RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 922126258Smlaier return (-1); 923126258Smlaier } 924126258Smlaier 925130613Smlaier if (state->id == 0 && state->creatorid == 0) { 926130613Smlaier state->id = htobe64(pf_status.stateid++); 927130613Smlaier state->creatorid = pf_status.hostid; 928130613Smlaier } 929130613Smlaier if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) { 930130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 931130613Smlaier#ifdef __FreeBSD__ 932130613Smlaier printf("pf: state insert failed: " 933130613Smlaier "id: %016llx creatorid: %08x", 934130613Smlaier (long long)be64toh(state->id), 935130613Smlaier ntohl(state->creatorid)); 936130613Smlaier#else 937130613Smlaier printf("pf: state insert failed: " 938130613Smlaier "id: %016llx creatorid: %08x", 939130613Smlaier betoh64(state->id), ntohl(state->creatorid)); 940130613Smlaier#endif 941130613Smlaier if (state->sync_flags & PFSTATE_FROMSYNC) 942130613Smlaier printf(" (from sync)"); 943130613Smlaier printf("\n"); 944130613Smlaier } 945130613Smlaier RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 946130613Smlaier RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state); 947130613Smlaier return (-1); 948130613Smlaier } 949130613Smlaier TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates); 950130613Smlaier 951126258Smlaier pf_status.fcounters[FCNT_STATE_INSERT]++; 952126258Smlaier pf_status.states++; 953130613Smlaier pfi_attach_state(kif); 954126258Smlaier#if NPFSYNC 955126258Smlaier pfsync_insert_state(state); 956126258Smlaier#endif 957126258Smlaier return (0); 958126258Smlaier} 959126258Smlaier 960126258Smlaiervoid 961126258Smlaierpf_purge_timeout(void *arg) 962126258Smlaier{ 963127145Smlaier#ifdef __FreeBSD__ 964126261Smlaier struct callout *to = arg; 965126261Smlaier#else 966126258Smlaier struct timeout *to = arg; 967126261Smlaier#endif 968126258Smlaier int s; 969126258Smlaier 970127145Smlaier#ifdef __FreeBSD__ 971126261Smlaier PF_LOCK(); 972126261Smlaier#endif 973126258Smlaier s = splsoftnet(); 974126258Smlaier pf_purge_expired_states(); 975126258Smlaier pf_purge_expired_fragments(); 976130613Smlaier pf_purge_expired_src_nodes(); 977126258Smlaier splx(s); 978127145Smlaier#ifdef __FreeBSD__ 979126261Smlaier PF_UNLOCK(); 980126261Smlaier#endif 981126258Smlaier 982127145Smlaier#ifdef __FreeBSD__ 983126261Smlaier callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz, 984126261Smlaier pf_purge_timeout, to); 985126261Smlaier#else 986126258Smlaier timeout_add(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz); 987126261Smlaier#endif 988126258Smlaier} 989126258Smlaier 990126258Smlaieru_int32_t 991126258Smlaierpf_state_expires(const struct pf_state *state) 992126258Smlaier{ 993126258Smlaier u_int32_t timeout; 994126258Smlaier u_int32_t start; 995126258Smlaier u_int32_t end; 996126258Smlaier u_int32_t states; 997126258Smlaier 998126258Smlaier /* handle all PFTM_* > PFTM_MAX here */ 999126258Smlaier if (state->timeout == PFTM_PURGE) 1000126261Smlaier return (time_second); 1001126258Smlaier if (state->timeout == PFTM_UNTIL_PACKET) 1002126258Smlaier return (0); 1003127145Smlaier#ifdef __FreeBSD__ 1004126261Smlaier KASSERT((state->timeout < PFTM_MAX), 1005126261Smlaier ("pf_state_expires: timeout > PFTM_MAX")); 1006126261Smlaier#else 1007126258Smlaier KASSERT(state->timeout < PFTM_MAX); 1008126261Smlaier#endif 1009126258Smlaier timeout = state->rule.ptr->timeout[state->timeout]; 1010126258Smlaier if (!timeout) 1011126258Smlaier timeout = pf_default_rule.timeout[state->timeout]; 1012126258Smlaier start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1013126258Smlaier if (start) { 1014126258Smlaier end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1015126258Smlaier states = state->rule.ptr->states; 1016126258Smlaier } else { 1017126258Smlaier start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1018126258Smlaier end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1019126258Smlaier states = pf_status.states; 1020126258Smlaier } 1021126258Smlaier if (end && states > start && start < end) { 1022126258Smlaier if (states < end) 1023126258Smlaier return (state->expire + timeout * (end - states) / 1024126258Smlaier (end - start)); 1025126258Smlaier else 1026126261Smlaier return (time_second); 1027126258Smlaier } 1028126258Smlaier return (state->expire + timeout); 1029126258Smlaier} 1030126258Smlaier 1031126258Smlaiervoid 1032130613Smlaierpf_purge_expired_src_nodes(void) 1033126258Smlaier{ 1034130613Smlaier struct pf_src_node *cur, *next; 1035126258Smlaier 1036130613Smlaier for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1037130613Smlaier next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1038126258Smlaier 1039130613Smlaier if (cur->states <= 0 && cur->expire <= time_second) { 1040130613Smlaier if (cur->rule.ptr != NULL) { 1041130613Smlaier cur->rule.ptr->src_nodes--; 1042130613Smlaier if (cur->rule.ptr->states <= 0 && 1043130613Smlaier cur->rule.ptr->max_src_nodes <= 0) 1044130613Smlaier pf_rm_rule(NULL, cur->rule.ptr); 1045130613Smlaier } 1046130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1047130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1048130613Smlaier pf_status.src_nodes--; 1049130613Smlaier pool_put(&pf_src_tree_pl, cur); 1050130613Smlaier } 1051130613Smlaier } 1052130613Smlaier} 1053126258Smlaier 1054130613Smlaiervoid 1055130613Smlaierpf_src_tree_remove_state(struct pf_state *s) 1056130613Smlaier{ 1057130613Smlaier u_int32_t timeout; 1058126258Smlaier 1059130613Smlaier if (s->src_node != NULL) { 1060145836Smlaier if (s->proto == IPPROTO_TCP) { 1061145836Smlaier if (s->src.state == PF_TCPS_PROXY_DST || 1062145836Smlaier s->timeout >= PFTM_TCP_ESTABLISHED) 1063145836Smlaier --s->src_node->conn; 1064145836Smlaier } 1065130613Smlaier if (--s->src_node->states <= 0) { 1066130613Smlaier timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1067130613Smlaier if (!timeout) 1068130613Smlaier timeout = 1069130613Smlaier pf_default_rule.timeout[PFTM_SRC_NODE]; 1070130613Smlaier s->src_node->expire = time_second + timeout; 1071130613Smlaier } 1072130613Smlaier } 1073130613Smlaier if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1074130613Smlaier if (--s->nat_src_node->states <= 0) { 1075130613Smlaier timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1076130613Smlaier if (!timeout) 1077130613Smlaier timeout = 1078130613Smlaier pf_default_rule.timeout[PFTM_SRC_NODE]; 1079130613Smlaier s->nat_src_node->expire = time_second + timeout; 1080130613Smlaier } 1081130613Smlaier } 1082130613Smlaier s->src_node = s->nat_src_node = NULL; 1083130613Smlaier} 1084126258Smlaier 1085130613Smlaiervoid 1086145836Smlaierpf_purge_expired_state(struct pf_state *cur) 1087145836Smlaier{ 1088148196Smlaier#ifdef __FreeBSD__ 1089148196Smlaier if (cur->sync_flags & PFSTATE_EXPIRING) 1090148196Smlaier return; 1091148196Smlaier cur->sync_flags |= PFSTATE_EXPIRING; 1092148196Smlaier#endif 1093145836Smlaier if (cur->src.state == PF_TCPS_PROXY_DST) 1094145836Smlaier pf_send_tcp(cur->rule.ptr, cur->af, 1095145836Smlaier &cur->ext.addr, &cur->lan.addr, 1096145836Smlaier cur->ext.port, cur->lan.port, 1097145836Smlaier cur->src.seqhi, cur->src.seqlo + 1, 1098145836Smlaier TH_RST|TH_ACK, 0, 0, 0, 1, NULL, NULL); 1099145836Smlaier RB_REMOVE(pf_state_tree_ext_gwy, 1100145836Smlaier &cur->u.s.kif->pfik_ext_gwy, cur); 1101145836Smlaier RB_REMOVE(pf_state_tree_lan_ext, 1102145836Smlaier &cur->u.s.kif->pfik_lan_ext, cur); 1103145836Smlaier RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1104145836Smlaier#if NPFSYNC 1105145836Smlaier pfsync_delete_state(cur); 1106145836Smlaier#endif 1107145836Smlaier pf_src_tree_remove_state(cur); 1108145836Smlaier if (--cur->rule.ptr->states <= 0 && 1109145836Smlaier cur->rule.ptr->src_nodes <= 0) 1110145836Smlaier pf_rm_rule(NULL, cur->rule.ptr); 1111145836Smlaier if (cur->nat_rule.ptr != NULL) 1112145836Smlaier if (--cur->nat_rule.ptr->states <= 0 && 1113145836Smlaier cur->nat_rule.ptr->src_nodes <= 0) 1114145836Smlaier pf_rm_rule(NULL, cur->nat_rule.ptr); 1115145836Smlaier if (cur->anchor.ptr != NULL) 1116145836Smlaier if (--cur->anchor.ptr->states <= 0) 1117145836Smlaier pf_rm_rule(NULL, cur->anchor.ptr); 1118145836Smlaier pf_normalize_tcp_cleanup(cur); 1119145836Smlaier pfi_detach_state(cur->u.s.kif); 1120145836Smlaier TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates); 1121145836Smlaier if (cur->tag) 1122145836Smlaier pf_tag_unref(cur->tag); 1123145836Smlaier pool_put(&pf_state_pl, cur); 1124145836Smlaier pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1125145836Smlaier pf_status.states--; 1126145836Smlaier} 1127145836Smlaier 1128145836Smlaiervoid 1129130613Smlaierpf_purge_expired_states(void) 1130130613Smlaier{ 1131130613Smlaier struct pf_state *cur, *next; 1132130613Smlaier 1133130613Smlaier for (cur = RB_MIN(pf_state_tree_id, &tree_id); 1134130613Smlaier cur; cur = next) { 1135130613Smlaier next = RB_NEXT(pf_state_tree_id, &tree_id, cur); 1136145836Smlaier if (pf_state_expires(cur) <= time_second) 1137145836Smlaier pf_purge_expired_state(cur); 1138126258Smlaier } 1139126258Smlaier} 1140126258Smlaier 1141126258Smlaierint 1142126258Smlaierpf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1143126258Smlaier{ 1144126258Smlaier if (aw->type != PF_ADDR_TABLE) 1145126258Smlaier return (0); 1146126258Smlaier if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1147126258Smlaier return (1); 1148126258Smlaier return (0); 1149126258Smlaier} 1150126258Smlaier 1151126258Smlaiervoid 1152126258Smlaierpf_tbladdr_remove(struct pf_addr_wrap *aw) 1153126258Smlaier{ 1154126258Smlaier if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1155126258Smlaier return; 1156126258Smlaier pfr_detach_table(aw->p.tbl); 1157126258Smlaier aw->p.tbl = NULL; 1158126258Smlaier} 1159126258Smlaier 1160126258Smlaiervoid 1161126258Smlaierpf_tbladdr_copyout(struct pf_addr_wrap *aw) 1162126258Smlaier{ 1163126258Smlaier struct pfr_ktable *kt = aw->p.tbl; 1164126258Smlaier 1165126258Smlaier if (aw->type != PF_ADDR_TABLE || kt == NULL) 1166126258Smlaier return; 1167126258Smlaier if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1168126258Smlaier kt = kt->pfrkt_root; 1169126258Smlaier aw->p.tbl = NULL; 1170126258Smlaier aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1171126258Smlaier kt->pfrkt_cnt : -1; 1172126258Smlaier} 1173126258Smlaier 1174126258Smlaiervoid 1175126258Smlaierpf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1176126258Smlaier{ 1177126258Smlaier switch (af) { 1178126258Smlaier#ifdef INET 1179126258Smlaier case AF_INET: { 1180126258Smlaier u_int32_t a = ntohl(addr->addr32[0]); 1181126258Smlaier printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1182126258Smlaier (a>>8)&255, a&255); 1183126258Smlaier if (p) { 1184126258Smlaier p = ntohs(p); 1185126258Smlaier printf(":%u", p); 1186126258Smlaier } 1187126258Smlaier break; 1188126258Smlaier } 1189126258Smlaier#endif /* INET */ 1190126258Smlaier#ifdef INET6 1191126258Smlaier case AF_INET6: { 1192126258Smlaier u_int16_t b; 1193126258Smlaier u_int8_t i, curstart = 255, curend = 0, 1194126258Smlaier maxstart = 0, maxend = 0; 1195126258Smlaier for (i = 0; i < 8; i++) { 1196126258Smlaier if (!addr->addr16[i]) { 1197126258Smlaier if (curstart == 255) 1198126258Smlaier curstart = i; 1199126258Smlaier else 1200126258Smlaier curend = i; 1201126258Smlaier } else { 1202126258Smlaier if (curstart) { 1203126258Smlaier if ((curend - curstart) > 1204126258Smlaier (maxend - maxstart)) { 1205126258Smlaier maxstart = curstart; 1206126258Smlaier maxend = curend; 1207126258Smlaier curstart = 255; 1208126258Smlaier } 1209126258Smlaier } 1210126258Smlaier } 1211126258Smlaier } 1212126258Smlaier for (i = 0; i < 8; i++) { 1213126258Smlaier if (i >= maxstart && i <= maxend) { 1214126258Smlaier if (maxend != 7) { 1215126258Smlaier if (i == maxstart) 1216126258Smlaier printf(":"); 1217126258Smlaier } else { 1218126258Smlaier if (i == maxend) 1219126258Smlaier printf(":"); 1220126258Smlaier } 1221126258Smlaier } else { 1222126258Smlaier b = ntohs(addr->addr16[i]); 1223126258Smlaier printf("%x", b); 1224126258Smlaier if (i < 7) 1225126258Smlaier printf(":"); 1226126258Smlaier } 1227126258Smlaier } 1228126258Smlaier if (p) { 1229126258Smlaier p = ntohs(p); 1230126258Smlaier printf("[%u]", p); 1231126258Smlaier } 1232126258Smlaier break; 1233126258Smlaier } 1234126258Smlaier#endif /* INET6 */ 1235126258Smlaier } 1236126258Smlaier} 1237126258Smlaier 1238126258Smlaiervoid 1239126258Smlaierpf_print_state(struct pf_state *s) 1240126258Smlaier{ 1241126258Smlaier switch (s->proto) { 1242126258Smlaier case IPPROTO_TCP: 1243126258Smlaier printf("TCP "); 1244126258Smlaier break; 1245126258Smlaier case IPPROTO_UDP: 1246126258Smlaier printf("UDP "); 1247126258Smlaier break; 1248126258Smlaier case IPPROTO_ICMP: 1249126258Smlaier printf("ICMP "); 1250126258Smlaier break; 1251126258Smlaier case IPPROTO_ICMPV6: 1252126258Smlaier printf("ICMPV6 "); 1253126258Smlaier break; 1254126258Smlaier default: 1255126258Smlaier printf("%u ", s->proto); 1256126258Smlaier break; 1257126258Smlaier } 1258126258Smlaier pf_print_host(&s->lan.addr, s->lan.port, s->af); 1259126258Smlaier printf(" "); 1260126258Smlaier pf_print_host(&s->gwy.addr, s->gwy.port, s->af); 1261126258Smlaier printf(" "); 1262126258Smlaier pf_print_host(&s->ext.addr, s->ext.port, s->af); 1263126258Smlaier printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1264126258Smlaier s->src.seqhi, s->src.max_win, s->src.seqdiff); 1265126258Smlaier if (s->src.wscale && s->dst.wscale) 1266126258Smlaier printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1267126258Smlaier printf("]"); 1268126258Smlaier printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1269126258Smlaier s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1270126258Smlaier if (s->src.wscale && s->dst.wscale) 1271126258Smlaier printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1272126258Smlaier printf("]"); 1273126258Smlaier printf(" %u:%u", s->src.state, s->dst.state); 1274126258Smlaier} 1275126258Smlaier 1276126258Smlaiervoid 1277126258Smlaierpf_print_flags(u_int8_t f) 1278126258Smlaier{ 1279126258Smlaier if (f) 1280126258Smlaier printf(" "); 1281126258Smlaier if (f & TH_FIN) 1282126258Smlaier printf("F"); 1283126258Smlaier if (f & TH_SYN) 1284126258Smlaier printf("S"); 1285126258Smlaier if (f & TH_RST) 1286126258Smlaier printf("R"); 1287126258Smlaier if (f & TH_PUSH) 1288126258Smlaier printf("P"); 1289126258Smlaier if (f & TH_ACK) 1290126258Smlaier printf("A"); 1291126258Smlaier if (f & TH_URG) 1292126258Smlaier printf("U"); 1293126258Smlaier if (f & TH_ECE) 1294126258Smlaier printf("E"); 1295126258Smlaier if (f & TH_CWR) 1296126258Smlaier printf("W"); 1297126258Smlaier} 1298126258Smlaier 1299126258Smlaier#define PF_SET_SKIP_STEPS(i) \ 1300126258Smlaier do { \ 1301126258Smlaier while (head[i] != cur) { \ 1302126258Smlaier head[i]->skip[i].ptr = cur; \ 1303126258Smlaier head[i] = TAILQ_NEXT(head[i], entries); \ 1304126258Smlaier } \ 1305126258Smlaier } while (0) 1306126258Smlaier 1307126258Smlaiervoid 1308126258Smlaierpf_calc_skip_steps(struct pf_rulequeue *rules) 1309126258Smlaier{ 1310126258Smlaier struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1311126258Smlaier int i; 1312126258Smlaier 1313126258Smlaier cur = TAILQ_FIRST(rules); 1314126258Smlaier prev = cur; 1315126258Smlaier for (i = 0; i < PF_SKIP_COUNT; ++i) 1316126258Smlaier head[i] = cur; 1317126258Smlaier while (cur != NULL) { 1318126258Smlaier 1319130613Smlaier if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1320126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1321126258Smlaier if (cur->direction != prev->direction) 1322126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1323126258Smlaier if (cur->af != prev->af) 1324126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_AF); 1325126258Smlaier if (cur->proto != prev->proto) 1326126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1327145836Smlaier if (cur->src.neg != prev->src.neg || 1328126258Smlaier pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1329126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1330126258Smlaier if (cur->src.port[0] != prev->src.port[0] || 1331126258Smlaier cur->src.port[1] != prev->src.port[1] || 1332126258Smlaier cur->src.port_op != prev->src.port_op) 1333126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1334145836Smlaier if (cur->dst.neg != prev->dst.neg || 1335126258Smlaier pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1336126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1337126258Smlaier if (cur->dst.port[0] != prev->dst.port[0] || 1338126258Smlaier cur->dst.port[1] != prev->dst.port[1] || 1339126258Smlaier cur->dst.port_op != prev->dst.port_op) 1340126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1341126258Smlaier 1342126258Smlaier prev = cur; 1343126258Smlaier cur = TAILQ_NEXT(cur, entries); 1344126258Smlaier } 1345126258Smlaier for (i = 0; i < PF_SKIP_COUNT; ++i) 1346126258Smlaier PF_SET_SKIP_STEPS(i); 1347126258Smlaier} 1348126258Smlaier 1349126258Smlaierint 1350126258Smlaierpf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1351126258Smlaier{ 1352126258Smlaier if (aw1->type != aw2->type) 1353126258Smlaier return (1); 1354126258Smlaier switch (aw1->type) { 1355126258Smlaier case PF_ADDR_ADDRMASK: 1356126258Smlaier if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1357126258Smlaier return (1); 1358126258Smlaier if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1359126258Smlaier return (1); 1360126258Smlaier return (0); 1361126258Smlaier case PF_ADDR_DYNIFTL: 1362130613Smlaier return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1363126258Smlaier case PF_ADDR_NOROUTE: 1364126258Smlaier return (0); 1365126258Smlaier case PF_ADDR_TABLE: 1366126258Smlaier return (aw1->p.tbl != aw2->p.tbl); 1367126258Smlaier default: 1368126258Smlaier printf("invalid address type: %d\n", aw1->type); 1369126258Smlaier return (1); 1370126258Smlaier } 1371126258Smlaier} 1372126258Smlaier 1373126258Smlaieru_int16_t 1374126258Smlaierpf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1375126258Smlaier{ 1376126258Smlaier u_int32_t l; 1377126258Smlaier 1378126258Smlaier if (udp && !cksum) 1379126258Smlaier return (0x0000); 1380126258Smlaier l = cksum + old - new; 1381126258Smlaier l = (l >> 16) + (l & 65535); 1382126258Smlaier l = l & 65535; 1383126258Smlaier if (udp && !l) 1384126258Smlaier return (0xFFFF); 1385126258Smlaier return (l); 1386126258Smlaier} 1387126258Smlaier 1388126258Smlaiervoid 1389126258Smlaierpf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1390126258Smlaier struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1391126258Smlaier{ 1392126258Smlaier struct pf_addr ao; 1393126258Smlaier u_int16_t po = *p; 1394126258Smlaier 1395126258Smlaier PF_ACPY(&ao, a, af); 1396126258Smlaier PF_ACPY(a, an, af); 1397126258Smlaier 1398126258Smlaier *p = pn; 1399126258Smlaier 1400126258Smlaier switch (af) { 1401126258Smlaier#ifdef INET 1402126258Smlaier case AF_INET: 1403126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1404126258Smlaier ao.addr16[0], an->addr16[0], 0), 1405126258Smlaier ao.addr16[1], an->addr16[1], 0); 1406126258Smlaier *p = pn; 1407126258Smlaier *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1408126258Smlaier ao.addr16[0], an->addr16[0], u), 1409126258Smlaier ao.addr16[1], an->addr16[1], u), 1410126258Smlaier po, pn, u); 1411126258Smlaier break; 1412126258Smlaier#endif /* INET */ 1413126258Smlaier#ifdef INET6 1414126258Smlaier case AF_INET6: 1415126258Smlaier *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1416126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1417126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1418126258Smlaier ao.addr16[0], an->addr16[0], u), 1419126258Smlaier ao.addr16[1], an->addr16[1], u), 1420126258Smlaier ao.addr16[2], an->addr16[2], u), 1421126258Smlaier ao.addr16[3], an->addr16[3], u), 1422126258Smlaier ao.addr16[4], an->addr16[4], u), 1423126258Smlaier ao.addr16[5], an->addr16[5], u), 1424126258Smlaier ao.addr16[6], an->addr16[6], u), 1425126258Smlaier ao.addr16[7], an->addr16[7], u), 1426126258Smlaier po, pn, u); 1427126258Smlaier break; 1428126258Smlaier#endif /* INET6 */ 1429126258Smlaier } 1430126258Smlaier} 1431126258Smlaier 1432126258Smlaier 1433126258Smlaier/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1434126258Smlaiervoid 1435126258Smlaierpf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1436126258Smlaier{ 1437126258Smlaier u_int32_t ao; 1438126258Smlaier 1439126258Smlaier memcpy(&ao, a, sizeof(ao)); 1440126258Smlaier memcpy(a, &an, sizeof(u_int32_t)); 1441126258Smlaier *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1442126258Smlaier ao % 65536, an % 65536, u); 1443126258Smlaier} 1444126258Smlaier 1445126258Smlaier#ifdef INET6 1446126258Smlaiervoid 1447126258Smlaierpf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1448126258Smlaier{ 1449126258Smlaier struct pf_addr ao; 1450126258Smlaier 1451126258Smlaier PF_ACPY(&ao, a, AF_INET6); 1452126258Smlaier PF_ACPY(a, an, AF_INET6); 1453126258Smlaier 1454126258Smlaier *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1455126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1456126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*c, 1457126258Smlaier ao.addr16[0], an->addr16[0], u), 1458126258Smlaier ao.addr16[1], an->addr16[1], u), 1459126258Smlaier ao.addr16[2], an->addr16[2], u), 1460126258Smlaier ao.addr16[3], an->addr16[3], u), 1461126258Smlaier ao.addr16[4], an->addr16[4], u), 1462126258Smlaier ao.addr16[5], an->addr16[5], u), 1463126258Smlaier ao.addr16[6], an->addr16[6], u), 1464126258Smlaier ao.addr16[7], an->addr16[7], u); 1465126258Smlaier} 1466126258Smlaier#endif /* INET6 */ 1467126258Smlaier 1468126258Smlaiervoid 1469126258Smlaierpf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1470126258Smlaier struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1471126258Smlaier u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1472126258Smlaier{ 1473126258Smlaier struct pf_addr oia, ooa; 1474126258Smlaier 1475126258Smlaier PF_ACPY(&oia, ia, af); 1476126258Smlaier PF_ACPY(&ooa, oa, af); 1477126258Smlaier 1478126258Smlaier /* Change inner protocol port, fix inner protocol checksum. */ 1479126258Smlaier if (ip != NULL) { 1480126258Smlaier u_int16_t oip = *ip; 1481127629Smlaier u_int32_t opc = 0; /* make the compiler happy */ 1482126258Smlaier 1483126258Smlaier if (pc != NULL) 1484126258Smlaier opc = *pc; 1485126258Smlaier *ip = np; 1486126258Smlaier if (pc != NULL) 1487126258Smlaier *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1488126258Smlaier *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1489126258Smlaier if (pc != NULL) 1490126258Smlaier *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1491126258Smlaier } 1492126258Smlaier /* Change inner ip address, fix inner ip and icmp checksums. */ 1493126258Smlaier PF_ACPY(ia, na, af); 1494126258Smlaier switch (af) { 1495126258Smlaier#ifdef INET 1496126258Smlaier case AF_INET: { 1497126258Smlaier u_int32_t oh2c = *h2c; 1498126258Smlaier 1499126258Smlaier *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1500126258Smlaier oia.addr16[0], ia->addr16[0], 0), 1501126258Smlaier oia.addr16[1], ia->addr16[1], 0); 1502126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1503126258Smlaier oia.addr16[0], ia->addr16[0], 0), 1504126258Smlaier oia.addr16[1], ia->addr16[1], 0); 1505126258Smlaier *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1506126258Smlaier break; 1507126258Smlaier } 1508126258Smlaier#endif /* INET */ 1509126258Smlaier#ifdef INET6 1510126258Smlaier case AF_INET6: 1511126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1512126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1513126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*ic, 1514126258Smlaier oia.addr16[0], ia->addr16[0], u), 1515126258Smlaier oia.addr16[1], ia->addr16[1], u), 1516126258Smlaier oia.addr16[2], ia->addr16[2], u), 1517126258Smlaier oia.addr16[3], ia->addr16[3], u), 1518126258Smlaier oia.addr16[4], ia->addr16[4], u), 1519126258Smlaier oia.addr16[5], ia->addr16[5], u), 1520126258Smlaier oia.addr16[6], ia->addr16[6], u), 1521126258Smlaier oia.addr16[7], ia->addr16[7], u); 1522126258Smlaier break; 1523126258Smlaier#endif /* INET6 */ 1524126258Smlaier } 1525126258Smlaier /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1526126258Smlaier PF_ACPY(oa, na, af); 1527126258Smlaier switch (af) { 1528126258Smlaier#ifdef INET 1529126258Smlaier case AF_INET: 1530126258Smlaier *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1531126258Smlaier ooa.addr16[0], oa->addr16[0], 0), 1532126258Smlaier ooa.addr16[1], oa->addr16[1], 0); 1533126258Smlaier break; 1534126258Smlaier#endif /* INET */ 1535126258Smlaier#ifdef INET6 1536126258Smlaier case AF_INET6: 1537126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1538126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1539126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*ic, 1540126258Smlaier ooa.addr16[0], oa->addr16[0], u), 1541126258Smlaier ooa.addr16[1], oa->addr16[1], u), 1542126258Smlaier ooa.addr16[2], oa->addr16[2], u), 1543126258Smlaier ooa.addr16[3], oa->addr16[3], u), 1544126258Smlaier ooa.addr16[4], oa->addr16[4], u), 1545126258Smlaier ooa.addr16[5], oa->addr16[5], u), 1546126258Smlaier ooa.addr16[6], oa->addr16[6], u), 1547126258Smlaier ooa.addr16[7], oa->addr16[7], u); 1548126258Smlaier break; 1549126258Smlaier#endif /* INET6 */ 1550126258Smlaier } 1551126258Smlaier} 1552126258Smlaier 1553126258Smlaiervoid 1554126258Smlaierpf_send_tcp(const struct pf_rule *r, sa_family_t af, 1555126258Smlaier const struct pf_addr *saddr, const struct pf_addr *daddr, 1556126258Smlaier u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1557145836Smlaier u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1558145836Smlaier struct ether_header *eh, struct ifnet *ifp) 1559126258Smlaier{ 1560126258Smlaier struct mbuf *m; 1561127629Smlaier int len = 0, tlen; /* make the compiler happy */ 1562126258Smlaier#ifdef INET 1563127629Smlaier struct ip *h = NULL; /* make the compiler happy */ 1564126258Smlaier#endif /* INET */ 1565126258Smlaier#ifdef INET6 1566127629Smlaier struct ip6_hdr *h6 = NULL; /* make the compiler happy */ 1567126258Smlaier#endif /* INET6 */ 1568127629Smlaier struct tcphdr *th = NULL; /* make the compiler happy */ 1569126258Smlaier char *opt; 1570126258Smlaier 1571126258Smlaier /* maximum segment size tcp option */ 1572126258Smlaier tlen = sizeof(struct tcphdr); 1573126258Smlaier if (mss) 1574126258Smlaier tlen += 4; 1575126258Smlaier 1576126258Smlaier switch (af) { 1577126258Smlaier#ifdef INET 1578126258Smlaier case AF_INET: 1579126258Smlaier len = sizeof(struct ip) + tlen; 1580126258Smlaier break; 1581126258Smlaier#endif /* INET */ 1582126258Smlaier#ifdef INET6 1583126258Smlaier case AF_INET6: 1584126258Smlaier len = sizeof(struct ip6_hdr) + tlen; 1585126258Smlaier break; 1586126258Smlaier#endif /* INET6 */ 1587126258Smlaier } 1588126258Smlaier 1589126258Smlaier /* create outgoing mbuf */ 1590132280Smlaier m = m_gethdr(M_DONTWAIT, MT_HEADER); 1591132280Smlaier if (m == NULL) 1592132280Smlaier return; 1593145836Smlaier if (tag) { 1594145836Smlaier#ifdef __FreeBSD__ 1595145836Smlaier m->m_flags |= M_SKIP_FIREWALL; 1596132280Smlaier#else 1597145836Smlaier struct m_tag *mtag; 1598145836Smlaier 1599145836Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 1600145836Smlaier if (mtag == NULL) { 1601145836Smlaier m_freem(m); 1602145836Smlaier return; 1603145836Smlaier } 1604145836Smlaier m_tag_prepend(m, mtag); 1605145836Smlaier#endif 1606126258Smlaier } 1607126258Smlaier#ifdef ALTQ 1608126258Smlaier if (r != NULL && r->qid) { 1609145836Smlaier struct m_tag *mtag; 1610126258Smlaier struct altq_tag *atag; 1611126258Smlaier 1612126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 1613126258Smlaier if (mtag != NULL) { 1614126258Smlaier atag = (struct altq_tag *)(mtag + 1); 1615126258Smlaier atag->qid = r->qid; 1616126258Smlaier /* add hints for ecn */ 1617126258Smlaier atag->af = af; 1618126258Smlaier atag->hdr = mtod(m, struct ip *); 1619126258Smlaier m_tag_prepend(m, mtag); 1620126258Smlaier } 1621126258Smlaier } 1622145836Smlaier#endif /* ALTQ */ 1623126258Smlaier m->m_data += max_linkhdr; 1624126258Smlaier m->m_pkthdr.len = m->m_len = len; 1625126258Smlaier m->m_pkthdr.rcvif = NULL; 1626126258Smlaier bzero(m->m_data, len); 1627126258Smlaier switch (af) { 1628126258Smlaier#ifdef INET 1629126258Smlaier case AF_INET: 1630126258Smlaier h = mtod(m, struct ip *); 1631126258Smlaier 1632126258Smlaier /* IP header fields included in the TCP checksum */ 1633126258Smlaier h->ip_p = IPPROTO_TCP; 1634126258Smlaier h->ip_len = htons(tlen); 1635126258Smlaier h->ip_src.s_addr = saddr->v4.s_addr; 1636126258Smlaier h->ip_dst.s_addr = daddr->v4.s_addr; 1637126258Smlaier 1638126258Smlaier th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1639126258Smlaier break; 1640126258Smlaier#endif /* INET */ 1641126258Smlaier#ifdef INET6 1642126258Smlaier case AF_INET6: 1643126258Smlaier h6 = mtod(m, struct ip6_hdr *); 1644126258Smlaier 1645126258Smlaier /* IP header fields included in the TCP checksum */ 1646126258Smlaier h6->ip6_nxt = IPPROTO_TCP; 1647126258Smlaier h6->ip6_plen = htons(tlen); 1648126258Smlaier memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1649126258Smlaier memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1650126258Smlaier 1651126258Smlaier th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1652126258Smlaier break; 1653126258Smlaier#endif /* INET6 */ 1654126258Smlaier } 1655126258Smlaier 1656126258Smlaier /* TCP header */ 1657126258Smlaier th->th_sport = sport; 1658126258Smlaier th->th_dport = dport; 1659126258Smlaier th->th_seq = htonl(seq); 1660126258Smlaier th->th_ack = htonl(ack); 1661126258Smlaier th->th_off = tlen >> 2; 1662126258Smlaier th->th_flags = flags; 1663126258Smlaier th->th_win = htons(win); 1664126258Smlaier 1665126258Smlaier if (mss) { 1666126258Smlaier opt = (char *)(th + 1); 1667126258Smlaier opt[0] = TCPOPT_MAXSEG; 1668126258Smlaier opt[1] = 4; 1669126258Smlaier HTONS(mss); 1670126258Smlaier bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1671126258Smlaier } 1672126258Smlaier 1673126258Smlaier switch (af) { 1674126258Smlaier#ifdef INET 1675126258Smlaier case AF_INET: 1676126258Smlaier /* TCP checksum */ 1677126258Smlaier th->th_sum = in_cksum(m, len); 1678126258Smlaier 1679126258Smlaier /* Finish the IP header */ 1680126258Smlaier h->ip_v = 4; 1681126258Smlaier h->ip_hl = sizeof(*h) >> 2; 1682126258Smlaier h->ip_tos = IPTOS_LOWDELAY; 1683127145Smlaier#ifdef __FreeBSD__ 1684130613Smlaier h->ip_off = path_mtu_discovery ? IP_DF : 0; 1685130613Smlaier h->ip_len = len; 1686126261Smlaier#else 1687126261Smlaier h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1688130613Smlaier h->ip_len = htons(len); 1689126261Smlaier#endif 1690126258Smlaier h->ip_ttl = ttl ? ttl : ip_defttl; 1691126258Smlaier h->ip_sum = 0; 1692145836Smlaier if (eh == NULL) { 1693127145Smlaier#ifdef __FreeBSD__ 1694145836Smlaier PF_UNLOCK(); 1695145836Smlaier ip_output(m, (void *)NULL, (void *)NULL, 0, 1696145836Smlaier (void *)NULL, (void *)NULL); 1697145836Smlaier PF_LOCK(); 1698126261Smlaier#else /* ! __FreeBSD__ */ 1699145836Smlaier ip_output(m, (void *)NULL, (void *)NULL, 0, 1700145836Smlaier (void *)NULL, (void *)NULL); 1701126261Smlaier#endif 1702145836Smlaier } else { 1703145836Smlaier struct route ro; 1704145836Smlaier struct rtentry rt; 1705145836Smlaier struct ether_header *e = (void *)ro.ro_dst.sa_data; 1706145836Smlaier 1707145836Smlaier if (ifp == NULL) { 1708145836Smlaier m_freem(m); 1709145836Smlaier return; 1710145836Smlaier } 1711145836Smlaier rt.rt_ifp = ifp; 1712145836Smlaier ro.ro_rt = &rt; 1713145836Smlaier ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1714145836Smlaier ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1715145836Smlaier bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1716145836Smlaier bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1717145836Smlaier e->ether_type = eh->ether_type; 1718145836Smlaier#ifdef __FreeBSD__ 1719145836Smlaier PF_UNLOCK(); 1720145836Smlaier /* XXX_IMPORT: later */ 1721145836Smlaier ip_output(m, (void *)NULL, &ro, 0, 1722145836Smlaier (void *)NULL, (void *)NULL); 1723145836Smlaier PF_LOCK(); 1724145836Smlaier#else /* ! __FreeBSD__ */ 1725145836Smlaier ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 1726145836Smlaier (void *)NULL, (void *)NULL); 1727145836Smlaier#endif 1728145836Smlaier } 1729126258Smlaier break; 1730126258Smlaier#endif /* INET */ 1731126258Smlaier#ifdef INET6 1732126258Smlaier case AF_INET6: 1733126258Smlaier /* TCP checksum */ 1734126258Smlaier th->th_sum = in6_cksum(m, IPPROTO_TCP, 1735126258Smlaier sizeof(struct ip6_hdr), tlen); 1736126258Smlaier 1737126258Smlaier h6->ip6_vfc |= IPV6_VERSION; 1738126258Smlaier h6->ip6_hlim = IPV6_DEFHLIM; 1739126258Smlaier 1740127145Smlaier#ifdef __FreeBSD__ 1741126261Smlaier PF_UNLOCK(); 1742126261Smlaier ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1743126261Smlaier PF_LOCK(); 1744126261Smlaier#else 1745126258Smlaier ip6_output(m, NULL, NULL, 0, NULL, NULL); 1746126261Smlaier#endif 1747126258Smlaier break; 1748126258Smlaier#endif /* INET6 */ 1749126258Smlaier } 1750126258Smlaier} 1751126258Smlaier 1752126258Smlaiervoid 1753126258Smlaierpf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1754126258Smlaier struct pf_rule *r) 1755126258Smlaier{ 1756132280Smlaier#ifdef ALTQ 1757126258Smlaier struct m_tag *mtag; 1758132280Smlaier#endif 1759126258Smlaier struct mbuf *m0; 1760127145Smlaier#ifdef __FreeBSD__ 1761126261Smlaier struct ip *ip; 1762126261Smlaier#endif 1763126258Smlaier 1764132280Smlaier#ifdef __FreeBSD__ 1765132280Smlaier m0 = m_copypacket(m, M_DONTWAIT); 1766132280Smlaier if (m0 == NULL) 1767132280Smlaier return; 1768132280Smlaier m0->m_flags |= M_SKIP_FIREWALL; 1769132280Smlaier#else 1770126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 1771126258Smlaier if (mtag == NULL) 1772126258Smlaier return; 1773126258Smlaier m0 = m_copy(m, 0, M_COPYALL); 1774126258Smlaier if (m0 == NULL) { 1775126258Smlaier m_tag_free(mtag); 1776126258Smlaier return; 1777126258Smlaier } 1778126258Smlaier m_tag_prepend(m0, mtag); 1779132280Smlaier#endif 1780126258Smlaier 1781126258Smlaier#ifdef ALTQ 1782126258Smlaier if (r->qid) { 1783126258Smlaier struct altq_tag *atag; 1784126258Smlaier 1785126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 1786126258Smlaier if (mtag != NULL) { 1787126258Smlaier atag = (struct altq_tag *)(mtag + 1); 1788126258Smlaier atag->qid = r->qid; 1789126258Smlaier /* add hints for ecn */ 1790126258Smlaier atag->af = af; 1791126258Smlaier atag->hdr = mtod(m0, struct ip *); 1792126258Smlaier m_tag_prepend(m0, mtag); 1793126258Smlaier } 1794126258Smlaier } 1795145836Smlaier#endif /* ALTQ */ 1796126258Smlaier 1797126258Smlaier switch (af) { 1798126258Smlaier#ifdef INET 1799126258Smlaier case AF_INET: 1800127145Smlaier#ifdef __FreeBSD__ 1801126261Smlaier /* icmp_error() expects host byte ordering */ 1802126261Smlaier ip = mtod(m0, struct ip *); 1803126261Smlaier NTOHS(ip->ip_len); 1804126261Smlaier NTOHS(ip->ip_off); 1805126261Smlaier PF_UNLOCK(); 1806145863Sandre icmp_error(m0, type, code, 0, 0); 1807126261Smlaier PF_LOCK(); 1808145874Smlaier#else 1809145874Smlaier icmp_error(m0, type, code, 0, (void *)NULL); 1810126261Smlaier#endif 1811126258Smlaier break; 1812126258Smlaier#endif /* INET */ 1813126258Smlaier#ifdef INET6 1814126258Smlaier case AF_INET6: 1815127145Smlaier#ifdef __FreeBSD__ 1816126261Smlaier PF_UNLOCK(); 1817126261Smlaier#endif 1818126258Smlaier icmp6_error(m0, type, code, 0); 1819127145Smlaier#ifdef __FreeBSD__ 1820126261Smlaier PF_LOCK(); 1821126261Smlaier#endif 1822126258Smlaier break; 1823126258Smlaier#endif /* INET6 */ 1824126258Smlaier } 1825126258Smlaier} 1826126258Smlaier 1827126258Smlaier/* 1828126258Smlaier * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1829126258Smlaier * If n is 0, they match if they are equal. If n is != 0, they match if they 1830126258Smlaier * are different. 1831126258Smlaier */ 1832126258Smlaierint 1833126258Smlaierpf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1834126258Smlaier struct pf_addr *b, sa_family_t af) 1835126258Smlaier{ 1836126258Smlaier int match = 0; 1837126258Smlaier 1838126258Smlaier switch (af) { 1839126258Smlaier#ifdef INET 1840126258Smlaier case AF_INET: 1841126258Smlaier if ((a->addr32[0] & m->addr32[0]) == 1842126258Smlaier (b->addr32[0] & m->addr32[0])) 1843126258Smlaier match++; 1844126258Smlaier break; 1845126258Smlaier#endif /* INET */ 1846126258Smlaier#ifdef INET6 1847126258Smlaier case AF_INET6: 1848126258Smlaier if (((a->addr32[0] & m->addr32[0]) == 1849126258Smlaier (b->addr32[0] & m->addr32[0])) && 1850126258Smlaier ((a->addr32[1] & m->addr32[1]) == 1851126258Smlaier (b->addr32[1] & m->addr32[1])) && 1852126258Smlaier ((a->addr32[2] & m->addr32[2]) == 1853126258Smlaier (b->addr32[2] & m->addr32[2])) && 1854126258Smlaier ((a->addr32[3] & m->addr32[3]) == 1855126258Smlaier (b->addr32[3] & m->addr32[3]))) 1856126258Smlaier match++; 1857126258Smlaier break; 1858126258Smlaier#endif /* INET6 */ 1859126258Smlaier } 1860126258Smlaier if (match) { 1861126258Smlaier if (n) 1862126258Smlaier return (0); 1863126258Smlaier else 1864126258Smlaier return (1); 1865126258Smlaier } else { 1866126258Smlaier if (n) 1867126258Smlaier return (1); 1868126258Smlaier else 1869126258Smlaier return (0); 1870126258Smlaier } 1871126258Smlaier} 1872126258Smlaier 1873126258Smlaierint 1874126258Smlaierpf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1875126258Smlaier{ 1876126258Smlaier switch (op) { 1877126258Smlaier case PF_OP_IRG: 1878126258Smlaier return ((p > a1) && (p < a2)); 1879126258Smlaier case PF_OP_XRG: 1880126258Smlaier return ((p < a1) || (p > a2)); 1881126258Smlaier case PF_OP_RRG: 1882126258Smlaier return ((p >= a1) && (p <= a2)); 1883126258Smlaier case PF_OP_EQ: 1884126258Smlaier return (p == a1); 1885126258Smlaier case PF_OP_NE: 1886126258Smlaier return (p != a1); 1887126258Smlaier case PF_OP_LT: 1888126258Smlaier return (p < a1); 1889126258Smlaier case PF_OP_LE: 1890126258Smlaier return (p <= a1); 1891126258Smlaier case PF_OP_GT: 1892126258Smlaier return (p > a1); 1893126258Smlaier case PF_OP_GE: 1894126258Smlaier return (p >= a1); 1895126258Smlaier } 1896126258Smlaier return (0); /* never reached */ 1897126258Smlaier} 1898126258Smlaier 1899126258Smlaierint 1900126258Smlaierpf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1901126258Smlaier{ 1902126258Smlaier NTOHS(a1); 1903126258Smlaier NTOHS(a2); 1904126258Smlaier NTOHS(p); 1905126258Smlaier return (pf_match(op, a1, a2, p)); 1906126258Smlaier} 1907126258Smlaier 1908126258Smlaierint 1909126258Smlaierpf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1910126258Smlaier{ 1911126258Smlaier if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1912126258Smlaier return (0); 1913126258Smlaier return (pf_match(op, a1, a2, u)); 1914126258Smlaier} 1915126258Smlaier 1916126258Smlaierint 1917126258Smlaierpf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 1918126258Smlaier{ 1919126258Smlaier if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1920126258Smlaier return (0); 1921126258Smlaier return (pf_match(op, a1, a2, g)); 1922126258Smlaier} 1923126258Smlaier 1924126258Smlaierstruct pf_tag * 1925126258Smlaierpf_get_tag(struct mbuf *m) 1926126258Smlaier{ 1927126258Smlaier struct m_tag *mtag; 1928126258Smlaier 1929126258Smlaier if ((mtag = m_tag_find(m, PACKET_TAG_PF_TAG, NULL)) != NULL) 1930126258Smlaier return ((struct pf_tag *)(mtag + 1)); 1931126258Smlaier else 1932126258Smlaier return (NULL); 1933126258Smlaier} 1934126258Smlaier 1935126258Smlaierint 1936145836Smlaierpf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_tag **pftag, int *tag) 1937126258Smlaier{ 1938126258Smlaier if (*tag == -1) { /* find mbuf tag */ 1939145836Smlaier *pftag = pf_get_tag(m); 1940145836Smlaier if (*pftag != NULL) 1941145836Smlaier *tag = (*pftag)->tag; 1942126258Smlaier else 1943126258Smlaier *tag = 0; 1944126258Smlaier } 1945126258Smlaier 1946126258Smlaier return ((!r->match_tag_not && r->match_tag == *tag) || 1947126258Smlaier (r->match_tag_not && r->match_tag != *tag)); 1948126258Smlaier} 1949126258Smlaier 1950126258Smlaierint 1951126258Smlaierpf_tag_packet(struct mbuf *m, struct pf_tag *pftag, int tag) 1952126258Smlaier{ 1953126258Smlaier struct m_tag *mtag; 1954126258Smlaier 1955126258Smlaier if (tag <= 0) 1956126258Smlaier return (0); 1957126258Smlaier 1958126258Smlaier if (pftag == NULL) { 1959126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_TAG, sizeof(*pftag), M_NOWAIT); 1960126258Smlaier if (mtag == NULL) 1961126258Smlaier return (1); 1962126258Smlaier ((struct pf_tag *)(mtag + 1))->tag = tag; 1963126258Smlaier m_tag_prepend(m, mtag); 1964126258Smlaier } else 1965126258Smlaier pftag->tag = tag; 1966126258Smlaier 1967126258Smlaier return (0); 1968126258Smlaier} 1969126258Smlaier 1970145836Smlaierstatic void 1971145836Smlaierpf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 1972145836Smlaier struct pf_rule **r, struct pf_rule **a) 1973145836Smlaier{ 1974145836Smlaier struct pf_anchor_stackframe *f; 1975126258Smlaier 1976145836Smlaier if (*depth >= sizeof(pf_anchor_stack) / 1977145836Smlaier sizeof(pf_anchor_stack[0])) { 1978145836Smlaier printf("pf_step_into_anchor: stack overflow\n"); 1979145836Smlaier *r = TAILQ_NEXT(*r, entries); 1980145836Smlaier return; 1981145836Smlaier } else if (*depth == 0 && a != NULL) 1982145836Smlaier *a = *r; 1983145836Smlaier f = pf_anchor_stack + (*depth)++; 1984145836Smlaier f->rs = *rs; 1985145836Smlaier f->r = *r; 1986145836Smlaier if ((*r)->anchor_wildcard) { 1987145836Smlaier f->parent = &(*r)->anchor->children; 1988145836Smlaier if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 1989145836Smlaier NULL) { 1990145836Smlaier *r = NULL; 1991145836Smlaier return; 1992145836Smlaier } 1993145836Smlaier *rs = &f->child->ruleset; 1994145836Smlaier } else { 1995145836Smlaier f->parent = NULL; 1996145836Smlaier f->child = NULL; 1997145836Smlaier *rs = &(*r)->anchor->ruleset; 1998145836Smlaier } 1999145836Smlaier *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2000145836Smlaier} 2001126258Smlaier 2002145836Smlaierstatic void 2003145836Smlaierpf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2004145836Smlaier struct pf_rule **r, struct pf_rule **a) 2005145836Smlaier{ 2006145836Smlaier struct pf_anchor_stackframe *f; 2007145836Smlaier 2008145836Smlaier do { 2009145836Smlaier if (*depth <= 0) 2010145836Smlaier break; 2011145836Smlaier f = pf_anchor_stack + *depth - 1; 2012145836Smlaier if (f->parent != NULL && f->child != NULL) { 2013145836Smlaier f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2014145836Smlaier if (f->child != NULL) { 2015145836Smlaier *rs = &f->child->ruleset; 2016145836Smlaier *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2017145836Smlaier if (*r == NULL) 2018145836Smlaier continue; 2019145836Smlaier else 2020145836Smlaier break; 2021145836Smlaier } 2022145836Smlaier } 2023145836Smlaier (*depth)--; 2024145836Smlaier if (*depth == 0 && a != NULL) 2025145836Smlaier *a = NULL; 2026145836Smlaier *rs = f->rs; 2027145836Smlaier *r = TAILQ_NEXT(f->r, entries); 2028145836Smlaier } while (*r == NULL); 2029145836Smlaier} 2030145836Smlaier 2031126258Smlaier#ifdef INET6 2032126258Smlaiervoid 2033126258Smlaierpf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2034126258Smlaier struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2035126258Smlaier{ 2036126258Smlaier switch (af) { 2037126258Smlaier#ifdef INET 2038126258Smlaier case AF_INET: 2039126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2040126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2041126258Smlaier break; 2042126258Smlaier#endif /* INET */ 2043126258Smlaier case AF_INET6: 2044126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2045126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2046126258Smlaier naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2047126258Smlaier ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2048126258Smlaier naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2049126258Smlaier ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2050126258Smlaier naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2051126258Smlaier ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2052126258Smlaier break; 2053126258Smlaier } 2054126258Smlaier} 2055126258Smlaier 2056126258Smlaiervoid 2057130613Smlaierpf_addr_inc(struct pf_addr *addr, sa_family_t af) 2058126258Smlaier{ 2059126258Smlaier switch (af) { 2060126258Smlaier#ifdef INET 2061126258Smlaier case AF_INET: 2062126258Smlaier addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2063126258Smlaier break; 2064126258Smlaier#endif /* INET */ 2065126258Smlaier case AF_INET6: 2066126258Smlaier if (addr->addr32[3] == 0xffffffff) { 2067126258Smlaier addr->addr32[3] = 0; 2068126258Smlaier if (addr->addr32[2] == 0xffffffff) { 2069126258Smlaier addr->addr32[2] = 0; 2070126258Smlaier if (addr->addr32[1] == 0xffffffff) { 2071126258Smlaier addr->addr32[1] = 0; 2072126258Smlaier addr->addr32[0] = 2073126258Smlaier htonl(ntohl(addr->addr32[0]) + 1); 2074126258Smlaier } else 2075126258Smlaier addr->addr32[1] = 2076126258Smlaier htonl(ntohl(addr->addr32[1]) + 1); 2077126258Smlaier } else 2078126258Smlaier addr->addr32[2] = 2079126258Smlaier htonl(ntohl(addr->addr32[2]) + 1); 2080126258Smlaier } else 2081126258Smlaier addr->addr32[3] = 2082126258Smlaier htonl(ntohl(addr->addr32[3]) + 1); 2083126258Smlaier break; 2084126258Smlaier } 2085126258Smlaier} 2086126258Smlaier#endif /* INET6 */ 2087126258Smlaier 2088126258Smlaier#define mix(a,b,c) \ 2089126258Smlaier do { \ 2090126258Smlaier a -= b; a -= c; a ^= (c >> 13); \ 2091126258Smlaier b -= c; b -= a; b ^= (a << 8); \ 2092126258Smlaier c -= a; c -= b; c ^= (b >> 13); \ 2093126258Smlaier a -= b; a -= c; a ^= (c >> 12); \ 2094126258Smlaier b -= c; b -= a; b ^= (a << 16); \ 2095126258Smlaier c -= a; c -= b; c ^= (b >> 5); \ 2096126258Smlaier a -= b; a -= c; a ^= (c >> 3); \ 2097126258Smlaier b -= c; b -= a; b ^= (a << 10); \ 2098126258Smlaier c -= a; c -= b; c ^= (b >> 15); \ 2099126258Smlaier } while (0) 2100126258Smlaier 2101126258Smlaier/* 2102126258Smlaier * hash function based on bridge_hash in if_bridge.c 2103126258Smlaier */ 2104126258Smlaiervoid 2105126258Smlaierpf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2106126258Smlaier struct pf_poolhashkey *key, sa_family_t af) 2107126258Smlaier{ 2108126258Smlaier u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2109126258Smlaier 2110126258Smlaier switch (af) { 2111126258Smlaier#ifdef INET 2112126258Smlaier case AF_INET: 2113126258Smlaier a += inaddr->addr32[0]; 2114126258Smlaier b += key->key32[1]; 2115126258Smlaier mix(a, b, c); 2116126258Smlaier hash->addr32[0] = c + key->key32[2]; 2117126258Smlaier break; 2118126258Smlaier#endif /* INET */ 2119126258Smlaier#ifdef INET6 2120126258Smlaier case AF_INET6: 2121126258Smlaier a += inaddr->addr32[0]; 2122126258Smlaier b += inaddr->addr32[2]; 2123126258Smlaier mix(a, b, c); 2124126258Smlaier hash->addr32[0] = c; 2125126258Smlaier a += inaddr->addr32[1]; 2126126258Smlaier b += inaddr->addr32[3]; 2127126258Smlaier c += key->key32[1]; 2128126258Smlaier mix(a, b, c); 2129126258Smlaier hash->addr32[1] = c; 2130126258Smlaier a += inaddr->addr32[2]; 2131126258Smlaier b += inaddr->addr32[1]; 2132126258Smlaier c += key->key32[2]; 2133126258Smlaier mix(a, b, c); 2134126258Smlaier hash->addr32[2] = c; 2135126258Smlaier a += inaddr->addr32[3]; 2136126258Smlaier b += inaddr->addr32[0]; 2137126258Smlaier c += key->key32[3]; 2138126258Smlaier mix(a, b, c); 2139126258Smlaier hash->addr32[3] = c; 2140126258Smlaier break; 2141126258Smlaier#endif /* INET6 */ 2142126258Smlaier } 2143126258Smlaier} 2144126258Smlaier 2145126258Smlaierint 2146130613Smlaierpf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2147130613Smlaier struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2148126258Smlaier{ 2149126258Smlaier unsigned char hash[16]; 2150130613Smlaier struct pf_pool *rpool = &r->rpool; 2151130613Smlaier struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2152130613Smlaier struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2153126258Smlaier struct pf_pooladdr *acur = rpool->cur; 2154130613Smlaier struct pf_src_node k; 2155126258Smlaier 2156130613Smlaier if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2157130613Smlaier (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2158130613Smlaier k.af = af; 2159130613Smlaier PF_ACPY(&k.addr, saddr, af); 2160130613Smlaier if (r->rule_flag & PFRULE_RULESRCTRACK || 2161130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) 2162130613Smlaier k.rule.ptr = r; 2163130613Smlaier else 2164130613Smlaier k.rule.ptr = NULL; 2165130613Smlaier pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2166130613Smlaier *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2167130613Smlaier if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2168130613Smlaier PF_ACPY(naddr, &(*sn)->raddr, af); 2169130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 2170130613Smlaier printf("pf_map_addr: src tracking maps "); 2171130613Smlaier pf_print_host(&k.addr, 0, af); 2172130613Smlaier printf(" to "); 2173130613Smlaier pf_print_host(naddr, 0, af); 2174130613Smlaier printf("\n"); 2175130613Smlaier } 2176130613Smlaier return (0); 2177130613Smlaier } 2178130613Smlaier } 2179130613Smlaier 2180126258Smlaier if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2181126258Smlaier return (1); 2182130613Smlaier if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2183145836Smlaier switch (af) { 2184145836Smlaier#ifdef INET 2185145836Smlaier case AF_INET: 2186130613Smlaier if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2187130613Smlaier (rpool->opts & PF_POOL_TYPEMASK) != 2188130613Smlaier PF_POOL_ROUNDROBIN) 2189130613Smlaier return (1); 2190130613Smlaier raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2191130613Smlaier rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2192145836Smlaier break; 2193145836Smlaier#endif /* INET */ 2194145836Smlaier#ifdef INET6 2195145836Smlaier case AF_INET6: 2196130613Smlaier if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2197130613Smlaier (rpool->opts & PF_POOL_TYPEMASK) != 2198130613Smlaier PF_POOL_ROUNDROBIN) 2199130613Smlaier return (1); 2200130613Smlaier raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2201130613Smlaier rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2202145836Smlaier break; 2203145836Smlaier#endif /* INET6 */ 2204130613Smlaier } 2205130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2206126258Smlaier if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2207126258Smlaier return (1); /* unsupported */ 2208126258Smlaier } else { 2209126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 2210126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 2211126258Smlaier } 2212126258Smlaier 2213126258Smlaier switch (rpool->opts & PF_POOL_TYPEMASK) { 2214126258Smlaier case PF_POOL_NONE: 2215126258Smlaier PF_ACPY(naddr, raddr, af); 2216126258Smlaier break; 2217126258Smlaier case PF_POOL_BITMASK: 2218126258Smlaier PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2219126258Smlaier break; 2220126258Smlaier case PF_POOL_RANDOM: 2221126258Smlaier if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2222126258Smlaier switch (af) { 2223126258Smlaier#ifdef INET 2224126258Smlaier case AF_INET: 2225145836Smlaier rpool->counter.addr32[0] = htonl(arc4random()); 2226126258Smlaier break; 2227126258Smlaier#endif /* INET */ 2228126258Smlaier#ifdef INET6 2229126258Smlaier case AF_INET6: 2230126258Smlaier if (rmask->addr32[3] != 0xffffffff) 2231145836Smlaier rpool->counter.addr32[3] = 2232145836Smlaier htonl(arc4random()); 2233126258Smlaier else 2234126258Smlaier break; 2235126258Smlaier if (rmask->addr32[2] != 0xffffffff) 2236145836Smlaier rpool->counter.addr32[2] = 2237145836Smlaier htonl(arc4random()); 2238126258Smlaier else 2239126258Smlaier break; 2240126258Smlaier if (rmask->addr32[1] != 0xffffffff) 2241145836Smlaier rpool->counter.addr32[1] = 2242145836Smlaier htonl(arc4random()); 2243126258Smlaier else 2244126258Smlaier break; 2245126258Smlaier if (rmask->addr32[0] != 0xffffffff) 2246145836Smlaier rpool->counter.addr32[0] = 2247145836Smlaier htonl(arc4random()); 2248126258Smlaier break; 2249126258Smlaier#endif /* INET6 */ 2250126258Smlaier } 2251126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2252126258Smlaier PF_ACPY(init_addr, naddr, af); 2253126258Smlaier 2254126258Smlaier } else { 2255126258Smlaier PF_AINC(&rpool->counter, af); 2256126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2257126258Smlaier } 2258126258Smlaier break; 2259126258Smlaier case PF_POOL_SRCHASH: 2260126258Smlaier pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2261126258Smlaier PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2262126258Smlaier break; 2263126258Smlaier case PF_POOL_ROUNDROBIN: 2264126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2265126258Smlaier if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2266126258Smlaier &rpool->tblidx, &rpool->counter, 2267126258Smlaier &raddr, &rmask, af)) 2268126258Smlaier goto get_addr; 2269130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2270130613Smlaier if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2271130613Smlaier &rpool->tblidx, &rpool->counter, 2272130613Smlaier &raddr, &rmask, af)) 2273130613Smlaier goto get_addr; 2274126258Smlaier } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2275126258Smlaier goto get_addr; 2276126258Smlaier 2277126258Smlaier try_next: 2278126258Smlaier if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2279126258Smlaier rpool->cur = TAILQ_FIRST(&rpool->list); 2280126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2281126258Smlaier rpool->tblidx = -1; 2282126258Smlaier if (pfr_pool_get(rpool->cur->addr.p.tbl, 2283126258Smlaier &rpool->tblidx, &rpool->counter, 2284126258Smlaier &raddr, &rmask, af)) { 2285130613Smlaier /* table contains no address of type 'af' */ 2286126258Smlaier if (rpool->cur != acur) 2287126258Smlaier goto try_next; 2288126258Smlaier return (1); 2289126258Smlaier } 2290130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2291130613Smlaier rpool->tblidx = -1; 2292130613Smlaier if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2293130613Smlaier &rpool->tblidx, &rpool->counter, 2294130613Smlaier &raddr, &rmask, af)) { 2295130613Smlaier /* table contains no address of type 'af' */ 2296130613Smlaier if (rpool->cur != acur) 2297130613Smlaier goto try_next; 2298130613Smlaier return (1); 2299130613Smlaier } 2300126258Smlaier } else { 2301126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 2302126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 2303126258Smlaier PF_ACPY(&rpool->counter, raddr, af); 2304126258Smlaier } 2305126258Smlaier 2306126258Smlaier get_addr: 2307126258Smlaier PF_ACPY(naddr, &rpool->counter, af); 2308139045Sdhartmei if (init_addr != NULL && PF_AZERO(init_addr, af)) 2309139045Sdhartmei PF_ACPY(init_addr, naddr, af); 2310126258Smlaier PF_AINC(&rpool->counter, af); 2311126258Smlaier break; 2312126258Smlaier } 2313130613Smlaier if (*sn != NULL) 2314130613Smlaier PF_ACPY(&(*sn)->raddr, naddr, af); 2315126258Smlaier 2316126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC && 2317126258Smlaier (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2318130613Smlaier printf("pf_map_addr: selected address "); 2319126258Smlaier pf_print_host(naddr, 0, af); 2320126258Smlaier printf("\n"); 2321126258Smlaier } 2322126258Smlaier 2323126258Smlaier return (0); 2324126258Smlaier} 2325126258Smlaier 2326126258Smlaierint 2327130613Smlaierpf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2328126258Smlaier struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2329130613Smlaier struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2330130613Smlaier struct pf_src_node **sn) 2331126258Smlaier{ 2332130613Smlaier struct pf_state key; 2333126258Smlaier struct pf_addr init_addr; 2334126258Smlaier u_int16_t cut; 2335126258Smlaier 2336126258Smlaier bzero(&init_addr, sizeof(init_addr)); 2337130613Smlaier if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2338126258Smlaier return (1); 2339126258Smlaier 2340149884Smlaier if (proto == IPPROTO_ICMP) { 2341149884Smlaier low = 1; 2342149884Smlaier high = 65535; 2343149884Smlaier } 2344149884Smlaier 2345126258Smlaier do { 2346126258Smlaier key.af = af; 2347126258Smlaier key.proto = proto; 2348130613Smlaier PF_ACPY(&key.ext.addr, daddr, key.af); 2349130613Smlaier PF_ACPY(&key.gwy.addr, naddr, key.af); 2350130613Smlaier key.ext.port = dport; 2351126258Smlaier 2352126258Smlaier /* 2353126258Smlaier * port search; start random, step; 2354126258Smlaier * similar 2 portloop in in_pcbbind 2355126258Smlaier */ 2356149884Smlaier if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2357149884Smlaier proto == IPPROTO_ICMP)) { 2358139045Sdhartmei key.gwy.port = dport; 2359130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2360126258Smlaier return (0); 2361126258Smlaier } else if (low == 0 && high == 0) { 2362130613Smlaier key.gwy.port = *nport; 2363130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2364126258Smlaier return (0); 2365126258Smlaier } else if (low == high) { 2366130613Smlaier key.gwy.port = htons(low); 2367130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2368126258Smlaier *nport = htons(low); 2369126258Smlaier return (0); 2370126258Smlaier } 2371126258Smlaier } else { 2372126258Smlaier u_int16_t tmp; 2373126258Smlaier 2374126258Smlaier if (low > high) { 2375126258Smlaier tmp = low; 2376126258Smlaier low = high; 2377126258Smlaier high = tmp; 2378126258Smlaier } 2379126258Smlaier /* low < high */ 2380145836Smlaier cut = htonl(arc4random()) % (1 + high - low) + low; 2381126258Smlaier /* low <= cut <= high */ 2382126258Smlaier for (tmp = cut; tmp <= high; ++(tmp)) { 2383130613Smlaier key.gwy.port = htons(tmp); 2384130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2385126258Smlaier NULL) { 2386126258Smlaier *nport = htons(tmp); 2387126258Smlaier return (0); 2388126258Smlaier } 2389126258Smlaier } 2390126258Smlaier for (tmp = cut - 1; tmp >= low; --(tmp)) { 2391130613Smlaier key.gwy.port = htons(tmp); 2392130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2393126258Smlaier NULL) { 2394126258Smlaier *nport = htons(tmp); 2395126258Smlaier return (0); 2396126258Smlaier } 2397126258Smlaier } 2398126258Smlaier } 2399126258Smlaier 2400130613Smlaier switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2401126258Smlaier case PF_POOL_RANDOM: 2402126258Smlaier case PF_POOL_ROUNDROBIN: 2403130613Smlaier if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2404126258Smlaier return (1); 2405126258Smlaier break; 2406126258Smlaier case PF_POOL_NONE: 2407126258Smlaier case PF_POOL_SRCHASH: 2408126258Smlaier case PF_POOL_BITMASK: 2409126258Smlaier default: 2410126258Smlaier return (1); 2411126258Smlaier } 2412126258Smlaier } while (! PF_AEQ(&init_addr, naddr, af) ); 2413126258Smlaier 2414126258Smlaier return (1); /* none available */ 2415126258Smlaier} 2416126258Smlaier 2417126258Smlaierstruct pf_rule * 2418126258Smlaierpf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2419130613Smlaier int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2420126258Smlaier struct pf_addr *daddr, u_int16_t dport, int rs_num) 2421126258Smlaier{ 2422145836Smlaier struct pf_rule *r, *rm = NULL; 2423126258Smlaier struct pf_ruleset *ruleset = NULL; 2424145836Smlaier struct pf_tag *pftag = NULL; 2425145836Smlaier int tag = -1; 2426145836Smlaier int asd = 0; 2427126258Smlaier 2428126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2429126258Smlaier while (r && rm == NULL) { 2430126258Smlaier struct pf_rule_addr *src = NULL, *dst = NULL; 2431126258Smlaier struct pf_addr_wrap *xdst = NULL; 2432126258Smlaier 2433126258Smlaier if (r->action == PF_BINAT && direction == PF_IN) { 2434126258Smlaier src = &r->dst; 2435126258Smlaier if (r->rpool.cur != NULL) 2436126258Smlaier xdst = &r->rpool.cur->addr; 2437126258Smlaier } else { 2438126258Smlaier src = &r->src; 2439126258Smlaier dst = &r->dst; 2440126258Smlaier } 2441126258Smlaier 2442126258Smlaier r->evaluations++; 2443130613Smlaier if (r->kif != NULL && 2444130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 2445126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 2446126258Smlaier else if (r->direction && r->direction != direction) 2447126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 2448126258Smlaier else if (r->af && r->af != pd->af) 2449126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 2450126258Smlaier else if (r->proto && r->proto != pd->proto) 2451126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 2452145836Smlaier else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->neg)) 2453126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2454126258Smlaier PF_SKIP_DST_ADDR].ptr; 2455126258Smlaier else if (src->port_op && !pf_match_port(src->port_op, 2456126258Smlaier src->port[0], src->port[1], sport)) 2457126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2458126258Smlaier PF_SKIP_DST_PORT].ptr; 2459126258Smlaier else if (dst != NULL && 2460145836Smlaier PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg)) 2461126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 2462126258Smlaier else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0)) 2463126258Smlaier r = TAILQ_NEXT(r, entries); 2464126258Smlaier else if (dst != NULL && dst->port_op && 2465126258Smlaier !pf_match_port(dst->port_op, dst->port[0], 2466126258Smlaier dst->port[1], dport)) 2467126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 2468145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 2469145836Smlaier r = TAILQ_NEXT(r, entries); 2470126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2471126258Smlaier IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2472126258Smlaier off, pd->hdr.tcp), r->os_fingerprint))) 2473126258Smlaier r = TAILQ_NEXT(r, entries); 2474145836Smlaier else { 2475145836Smlaier if (r->tag) 2476145836Smlaier tag = r->tag; 2477145836Smlaier if (r->anchor == NULL) { 2478126258Smlaier rm = r; 2479145836Smlaier } else 2480145836Smlaier pf_step_into_anchor(&asd, &ruleset, rs_num, &r, NULL); 2481145836Smlaier } 2482145836Smlaier if (r == NULL) 2483145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, NULL); 2484126258Smlaier } 2485145836Smlaier if (pf_tag_packet(m, pftag, tag)) 2486145836Smlaier return (NULL); 2487126258Smlaier if (rm != NULL && (rm->action == PF_NONAT || 2488126258Smlaier rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2489126258Smlaier return (NULL); 2490126258Smlaier return (rm); 2491126258Smlaier} 2492126258Smlaier 2493126258Smlaierstruct pf_rule * 2494126258Smlaierpf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2495130613Smlaier struct pfi_kif *kif, struct pf_src_node **sn, 2496126258Smlaier struct pf_addr *saddr, u_int16_t sport, 2497126258Smlaier struct pf_addr *daddr, u_int16_t dport, 2498126258Smlaier struct pf_addr *naddr, u_int16_t *nport) 2499126258Smlaier{ 2500126258Smlaier struct pf_rule *r = NULL; 2501126258Smlaier 2502126258Smlaier if (direction == PF_OUT) { 2503130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, saddr, 2504126258Smlaier sport, daddr, dport, PF_RULESET_BINAT); 2505126258Smlaier if (r == NULL) 2506130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, 2507126258Smlaier saddr, sport, daddr, dport, PF_RULESET_NAT); 2508126258Smlaier } else { 2509130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, saddr, 2510126258Smlaier sport, daddr, dport, PF_RULESET_RDR); 2511126258Smlaier if (r == NULL) 2512130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, 2513126258Smlaier saddr, sport, daddr, dport, PF_RULESET_BINAT); 2514126258Smlaier } 2515126258Smlaier 2516126258Smlaier if (r != NULL) { 2517126258Smlaier switch (r->action) { 2518126258Smlaier case PF_NONAT: 2519126258Smlaier case PF_NOBINAT: 2520126258Smlaier case PF_NORDR: 2521126258Smlaier return (NULL); 2522126258Smlaier case PF_NAT: 2523130613Smlaier if (pf_get_sport(pd->af, pd->proto, r, saddr, 2524126258Smlaier daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2525130613Smlaier r->rpool.proxy_port[1], sn)) { 2526126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 2527126258Smlaier ("pf: NAT proxy port allocation " 2528126258Smlaier "(%u-%u) failed\n", 2529126258Smlaier r->rpool.proxy_port[0], 2530126258Smlaier r->rpool.proxy_port[1])); 2531126258Smlaier return (NULL); 2532126258Smlaier } 2533126258Smlaier break; 2534126258Smlaier case PF_BINAT: 2535126258Smlaier switch (direction) { 2536126258Smlaier case PF_OUT: 2537130613Smlaier if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2538145836Smlaier switch (pd->af) { 2539145836Smlaier#ifdef INET 2540145836Smlaier case AF_INET: 2541130613Smlaier if (r->rpool.cur->addr.p.dyn-> 2542130613Smlaier pfid_acnt4 < 1) 2543130613Smlaier return (NULL); 2544130613Smlaier PF_POOLMASK(naddr, 2545130613Smlaier &r->rpool.cur->addr.p.dyn-> 2546130613Smlaier pfid_addr4, 2547130613Smlaier &r->rpool.cur->addr.p.dyn-> 2548130613Smlaier pfid_mask4, 2549130613Smlaier saddr, AF_INET); 2550145836Smlaier break; 2551145836Smlaier#endif /* INET */ 2552145836Smlaier#ifdef INET6 2553145836Smlaier case AF_INET6: 2554130613Smlaier if (r->rpool.cur->addr.p.dyn-> 2555130613Smlaier pfid_acnt6 < 1) 2556130613Smlaier return (NULL); 2557130613Smlaier PF_POOLMASK(naddr, 2558130613Smlaier &r->rpool.cur->addr.p.dyn-> 2559130613Smlaier pfid_addr6, 2560130613Smlaier &r->rpool.cur->addr.p.dyn-> 2561130613Smlaier pfid_mask6, 2562130613Smlaier saddr, AF_INET6); 2563145836Smlaier break; 2564145836Smlaier#endif /* INET6 */ 2565130613Smlaier } 2566130613Smlaier } else 2567126258Smlaier PF_POOLMASK(naddr, 2568126258Smlaier &r->rpool.cur->addr.v.a.addr, 2569126258Smlaier &r->rpool.cur->addr.v.a.mask, 2570126258Smlaier saddr, pd->af); 2571126258Smlaier break; 2572126258Smlaier case PF_IN: 2573138041Sdhartmei if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2574145836Smlaier switch (pd->af) { 2575145836Smlaier#ifdef INET 2576145836Smlaier case AF_INET: 2577130613Smlaier if (r->src.addr.p.dyn-> 2578130613Smlaier pfid_acnt4 < 1) 2579130613Smlaier return (NULL); 2580130613Smlaier PF_POOLMASK(naddr, 2581130613Smlaier &r->src.addr.p.dyn-> 2582130613Smlaier pfid_addr4, 2583130613Smlaier &r->src.addr.p.dyn-> 2584130613Smlaier pfid_mask4, 2585130613Smlaier daddr, AF_INET); 2586145836Smlaier break; 2587145836Smlaier#endif /* INET */ 2588145836Smlaier#ifdef INET6 2589145836Smlaier case AF_INET6: 2590130613Smlaier if (r->src.addr.p.dyn-> 2591130613Smlaier pfid_acnt6 < 1) 2592130613Smlaier return (NULL); 2593130613Smlaier PF_POOLMASK(naddr, 2594130613Smlaier &r->src.addr.p.dyn-> 2595130613Smlaier pfid_addr6, 2596130613Smlaier &r->src.addr.p.dyn-> 2597130613Smlaier pfid_mask6, 2598130613Smlaier daddr, AF_INET6); 2599145836Smlaier break; 2600145836Smlaier#endif /* INET6 */ 2601130613Smlaier } 2602130613Smlaier } else 2603126258Smlaier PF_POOLMASK(naddr, 2604126258Smlaier &r->src.addr.v.a.addr, 2605126261Smlaier &r->src.addr.v.a.mask, daddr, 2606126258Smlaier pd->af); 2607126258Smlaier break; 2608126258Smlaier } 2609126258Smlaier break; 2610126258Smlaier case PF_RDR: { 2611140518Sdhartmei if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2612126258Smlaier return (NULL); 2613149884Smlaier if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2614149884Smlaier PF_POOL_BITMASK) 2615149884Smlaier PF_POOLMASK(naddr, naddr, 2616149884Smlaier &r->rpool.cur->addr.v.a.mask, daddr, 2617149884Smlaier pd->af); 2618126258Smlaier 2619126258Smlaier if (r->rpool.proxy_port[1]) { 2620126258Smlaier u_int32_t tmp_nport; 2621126258Smlaier 2622126258Smlaier tmp_nport = ((ntohs(dport) - 2623126258Smlaier ntohs(r->dst.port[0])) % 2624126258Smlaier (r->rpool.proxy_port[1] - 2625126258Smlaier r->rpool.proxy_port[0] + 1)) + 2626126258Smlaier r->rpool.proxy_port[0]; 2627126258Smlaier 2628126258Smlaier /* wrap around if necessary */ 2629126258Smlaier if (tmp_nport > 65535) 2630126258Smlaier tmp_nport -= 65535; 2631126258Smlaier *nport = htons((u_int16_t)tmp_nport); 2632126258Smlaier } else if (r->rpool.proxy_port[0]) 2633126258Smlaier *nport = htons(r->rpool.proxy_port[0]); 2634126258Smlaier break; 2635126258Smlaier } 2636126258Smlaier default: 2637126258Smlaier return (NULL); 2638126258Smlaier } 2639126258Smlaier } 2640126258Smlaier 2641126258Smlaier return (r); 2642126258Smlaier} 2643126258Smlaier 2644126258Smlaierint 2645135920Smlaier#ifdef __FreeBSD__ 2646135920Smlaierpf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd, 2647135920Smlaier struct inpcb *inp_arg) 2648135920Smlaier#else 2649130613Smlaierpf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd) 2650135920Smlaier#endif 2651126258Smlaier{ 2652126258Smlaier struct pf_addr *saddr, *daddr; 2653126258Smlaier u_int16_t sport, dport; 2654127145Smlaier#ifdef __FreeBSD__ 2655126261Smlaier struct inpcbinfo *pi; 2656126261Smlaier#else 2657126258Smlaier struct inpcbtable *tb; 2658126261Smlaier#endif 2659126258Smlaier struct inpcb *inp; 2660126258Smlaier 2661126258Smlaier *uid = UID_MAX; 2662126258Smlaier *gid = GID_MAX; 2663135920Smlaier#ifdef __FreeBSD__ 2664135920Smlaier if (inp_arg != NULL) { 2665135920Smlaier INP_LOCK_ASSERT(inp_arg); 2666135920Smlaier if (inp_arg->inp_socket) { 2667135920Smlaier *uid = inp_arg->inp_socket->so_cred->cr_uid; 2668135920Smlaier *gid = inp_arg->inp_socket->so_cred->cr_groups[0]; 2669135920Smlaier return (1); 2670135920Smlaier } else 2671135920Smlaier return (0); 2672135920Smlaier } 2673135920Smlaier#endif 2674130613Smlaier switch (pd->proto) { 2675126258Smlaier case IPPROTO_TCP: 2676126258Smlaier sport = pd->hdr.tcp->th_sport; 2677126258Smlaier dport = pd->hdr.tcp->th_dport; 2678127145Smlaier#ifdef __FreeBSD__ 2679126261Smlaier pi = &tcbinfo; 2680126261Smlaier#else 2681126258Smlaier tb = &tcbtable; 2682126261Smlaier#endif 2683126258Smlaier break; 2684126258Smlaier case IPPROTO_UDP: 2685126258Smlaier sport = pd->hdr.udp->uh_sport; 2686126258Smlaier dport = pd->hdr.udp->uh_dport; 2687127145Smlaier#ifdef __FreeBSD__ 2688126261Smlaier pi = &udbinfo; 2689126261Smlaier#else 2690126258Smlaier tb = &udbtable; 2691126261Smlaier#endif 2692126258Smlaier break; 2693126258Smlaier default: 2694126258Smlaier return (0); 2695126258Smlaier } 2696126258Smlaier if (direction == PF_IN) { 2697126258Smlaier saddr = pd->src; 2698126258Smlaier daddr = pd->dst; 2699126258Smlaier } else { 2700126258Smlaier u_int16_t p; 2701126258Smlaier 2702126258Smlaier p = sport; 2703126258Smlaier sport = dport; 2704126258Smlaier dport = p; 2705126258Smlaier saddr = pd->dst; 2706126258Smlaier daddr = pd->src; 2707126258Smlaier } 2708130613Smlaier switch (pd->af) { 2709145836Smlaier#ifdef INET 2710126258Smlaier case AF_INET: 2711127145Smlaier#ifdef __FreeBSD__ 2712126261Smlaier INP_INFO_RLOCK(pi); /* XXX LOR */ 2713126261Smlaier inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2714126261Smlaier dport, 0, NULL); 2715126261Smlaier if (inp == NULL) { 2716126261Smlaier inp = in_pcblookup_hash(pi, saddr->v4, sport, 2717126261Smlaier daddr->v4, dport, INPLOOKUP_WILDCARD, NULL); 2718126261Smlaier if(inp == NULL) { 2719126261Smlaier INP_INFO_RUNLOCK(pi); 2720126261Smlaier return (0); 2721126261Smlaier } 2722126261Smlaier } 2723126261Smlaier#else 2724126258Smlaier inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 2725126258Smlaier if (inp == NULL) { 2726130613Smlaier inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 2727126258Smlaier if (inp == NULL) 2728126258Smlaier return (0); 2729126258Smlaier } 2730126261Smlaier#endif 2731126258Smlaier break; 2732145836Smlaier#endif /* INET */ 2733126258Smlaier#ifdef INET6 2734126258Smlaier case AF_INET6: 2735127145Smlaier#ifdef __FreeBSD__ 2736126261Smlaier INP_INFO_RLOCK(pi); 2737126261Smlaier inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2738126261Smlaier &daddr->v6, dport, 0, NULL); 2739126261Smlaier if (inp == NULL) { 2740126261Smlaier inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2741126261Smlaier &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2742126261Smlaier if (inp == NULL) { 2743126261Smlaier INP_INFO_RUNLOCK(pi); 2744126261Smlaier return (0); 2745126261Smlaier } 2746126261Smlaier } 2747126261Smlaier#else 2748126258Smlaier inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 2749126258Smlaier dport); 2750126258Smlaier if (inp == NULL) { 2751130613Smlaier inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 2752126258Smlaier if (inp == NULL) 2753126258Smlaier return (0); 2754126258Smlaier } 2755126261Smlaier#endif 2756126258Smlaier break; 2757126258Smlaier#endif /* INET6 */ 2758126258Smlaier 2759126258Smlaier default: 2760126258Smlaier return (0); 2761126258Smlaier } 2762127145Smlaier#ifdef __FreeBSD__ 2763126261Smlaier INP_LOCK(inp); 2764136925Smlaier if ((inp->inp_socket == NULL) || (inp->inp_socket->so_cred == NULL)) { 2765136925Smlaier INP_UNLOCK(inp); 2766136925Smlaier INP_INFO_RUNLOCK(pi); 2767136925Smlaier return (0); 2768136925Smlaier } 2769126261Smlaier *uid = inp->inp_socket->so_cred->cr_uid; 2770126261Smlaier *gid = inp->inp_socket->so_cred->cr_groups[0]; 2771126261Smlaier INP_UNLOCK(inp); 2772126261Smlaier INP_INFO_RUNLOCK(pi); 2773126261Smlaier#else 2774126258Smlaier *uid = inp->inp_socket->so_euid; 2775126258Smlaier *gid = inp->inp_socket->so_egid; 2776126261Smlaier#endif 2777126258Smlaier return (1); 2778126258Smlaier} 2779126258Smlaier 2780126258Smlaieru_int8_t 2781126258Smlaierpf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2782126258Smlaier{ 2783126258Smlaier int hlen; 2784126258Smlaier u_int8_t hdr[60]; 2785126258Smlaier u_int8_t *opt, optlen; 2786126258Smlaier u_int8_t wscale = 0; 2787126258Smlaier 2788126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2789126258Smlaier if (hlen <= sizeof(struct tcphdr)) 2790126258Smlaier return (0); 2791126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2792126258Smlaier return (0); 2793126258Smlaier opt = hdr + sizeof(struct tcphdr); 2794126258Smlaier hlen -= sizeof(struct tcphdr); 2795126258Smlaier while (hlen >= 3) { 2796126258Smlaier switch (*opt) { 2797126258Smlaier case TCPOPT_EOL: 2798126258Smlaier case TCPOPT_NOP: 2799126258Smlaier ++opt; 2800126258Smlaier --hlen; 2801126258Smlaier break; 2802126258Smlaier case TCPOPT_WINDOW: 2803126258Smlaier wscale = opt[2]; 2804126258Smlaier if (wscale > TCP_MAX_WINSHIFT) 2805126258Smlaier wscale = TCP_MAX_WINSHIFT; 2806126258Smlaier wscale |= PF_WSCALE_FLAG; 2807130613Smlaier /* FALLTHROUGH */ 2808126258Smlaier default: 2809126258Smlaier optlen = opt[1]; 2810126258Smlaier if (optlen < 2) 2811126258Smlaier optlen = 2; 2812126258Smlaier hlen -= optlen; 2813126258Smlaier opt += optlen; 2814130613Smlaier break; 2815126258Smlaier } 2816126258Smlaier } 2817126258Smlaier return (wscale); 2818126258Smlaier} 2819126258Smlaier 2820126258Smlaieru_int16_t 2821126258Smlaierpf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2822126258Smlaier{ 2823126258Smlaier int hlen; 2824126258Smlaier u_int8_t hdr[60]; 2825126258Smlaier u_int8_t *opt, optlen; 2826126258Smlaier u_int16_t mss = tcp_mssdflt; 2827126258Smlaier 2828126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2829126258Smlaier if (hlen <= sizeof(struct tcphdr)) 2830126258Smlaier return (0); 2831126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2832126258Smlaier return (0); 2833126258Smlaier opt = hdr + sizeof(struct tcphdr); 2834126258Smlaier hlen -= sizeof(struct tcphdr); 2835126258Smlaier while (hlen >= TCPOLEN_MAXSEG) { 2836126258Smlaier switch (*opt) { 2837126258Smlaier case TCPOPT_EOL: 2838126258Smlaier case TCPOPT_NOP: 2839126258Smlaier ++opt; 2840126258Smlaier --hlen; 2841126258Smlaier break; 2842126258Smlaier case TCPOPT_MAXSEG: 2843126258Smlaier bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2844145030Sglebius NTOHS(mss); 2845130613Smlaier /* FALLTHROUGH */ 2846126258Smlaier default: 2847126258Smlaier optlen = opt[1]; 2848126258Smlaier if (optlen < 2) 2849126258Smlaier optlen = 2; 2850126258Smlaier hlen -= optlen; 2851126258Smlaier opt += optlen; 2852130613Smlaier break; 2853126258Smlaier } 2854126258Smlaier } 2855126258Smlaier return (mss); 2856126258Smlaier} 2857126258Smlaier 2858126258Smlaieru_int16_t 2859126258Smlaierpf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2860126258Smlaier{ 2861126258Smlaier#ifdef INET 2862126258Smlaier struct sockaddr_in *dst; 2863126258Smlaier struct route ro; 2864126258Smlaier#endif /* INET */ 2865126258Smlaier#ifdef INET6 2866126258Smlaier struct sockaddr_in6 *dst6; 2867126258Smlaier struct route_in6 ro6; 2868126258Smlaier#endif /* INET6 */ 2869126258Smlaier struct rtentry *rt = NULL; 2870127629Smlaier int hlen = 0; /* make the compiler happy */ 2871126258Smlaier u_int16_t mss = tcp_mssdflt; 2872126258Smlaier 2873126258Smlaier switch (af) { 2874126258Smlaier#ifdef INET 2875126258Smlaier case AF_INET: 2876126258Smlaier hlen = sizeof(struct ip); 2877126258Smlaier bzero(&ro, sizeof(ro)); 2878126258Smlaier dst = (struct sockaddr_in *)&ro.ro_dst; 2879126258Smlaier dst->sin_family = AF_INET; 2880126258Smlaier dst->sin_len = sizeof(*dst); 2881126258Smlaier dst->sin_addr = addr->v4; 2882127145Smlaier#ifdef __FreeBSD__ 2883126261Smlaier#ifdef RTF_PRCLONING 2884126261Smlaier rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 2885126261Smlaier#else /* !RTF_PRCLONING */ 2886126261Smlaier rtalloc_ign(&ro, RTF_CLONING); 2887126261Smlaier#endif 2888126261Smlaier#else /* ! __FreeBSD__ */ 2889126258Smlaier rtalloc_noclone(&ro, NO_CLONING); 2890126261Smlaier#endif 2891126258Smlaier rt = ro.ro_rt; 2892126258Smlaier break; 2893126258Smlaier#endif /* INET */ 2894126258Smlaier#ifdef INET6 2895126258Smlaier case AF_INET6: 2896126258Smlaier hlen = sizeof(struct ip6_hdr); 2897126258Smlaier bzero(&ro6, sizeof(ro6)); 2898126258Smlaier dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2899126258Smlaier dst6->sin6_family = AF_INET6; 2900126258Smlaier dst6->sin6_len = sizeof(*dst6); 2901126258Smlaier dst6->sin6_addr = addr->v6; 2902127145Smlaier#ifdef __FreeBSD__ 2903126261Smlaier#ifdef RTF_PRCLONING 2904126261Smlaier rtalloc_ign((struct route *)&ro6, 2905126261Smlaier (RTF_CLONING | RTF_PRCLONING)); 2906126261Smlaier#else /* !RTF_PRCLONING */ 2907126261Smlaier rtalloc_ign((struct route *)&ro6, RTF_CLONING); 2908126261Smlaier#endif 2909126261Smlaier#else /* ! __FreeBSD__ */ 2910126258Smlaier rtalloc_noclone((struct route *)&ro6, NO_CLONING); 2911126261Smlaier#endif 2912126258Smlaier rt = ro6.ro_rt; 2913126258Smlaier break; 2914126258Smlaier#endif /* INET6 */ 2915126258Smlaier } 2916126258Smlaier 2917126258Smlaier if (rt && rt->rt_ifp) { 2918126258Smlaier mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2919126258Smlaier mss = max(tcp_mssdflt, mss); 2920126258Smlaier RTFREE(rt); 2921126258Smlaier } 2922126258Smlaier mss = min(mss, offer); 2923126258Smlaier mss = max(mss, 64); /* sanity - at least max opt space */ 2924126258Smlaier return (mss); 2925126258Smlaier} 2926126258Smlaier 2927126258Smlaiervoid 2928126258Smlaierpf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2929126258Smlaier{ 2930126258Smlaier struct pf_rule *r = s->rule.ptr; 2931126258Smlaier 2932130613Smlaier s->rt_kif = NULL; 2933126258Smlaier if (!r->rt || r->rt == PF_FASTROUTE) 2934126258Smlaier return; 2935126258Smlaier switch (s->af) { 2936126258Smlaier#ifdef INET 2937126258Smlaier case AF_INET: 2938130613Smlaier pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 2939130613Smlaier &s->nat_src_node); 2940130613Smlaier s->rt_kif = r->rpool.cur->kif; 2941126258Smlaier break; 2942126258Smlaier#endif /* INET */ 2943126258Smlaier#ifdef INET6 2944126258Smlaier case AF_INET6: 2945130613Smlaier pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 2946130613Smlaier &s->nat_src_node); 2947130613Smlaier s->rt_kif = r->rpool.cur->kif; 2948126258Smlaier break; 2949126258Smlaier#endif /* INET6 */ 2950126258Smlaier } 2951126258Smlaier} 2952126258Smlaier 2953126258Smlaierint 2954126258Smlaierpf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 2955130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 2956135920Smlaier#ifdef __FreeBSD__ 2957135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 2958145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 2959135920Smlaier#else 2960145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 2961145836Smlaier struct ifqueue *ifq) 2962135920Smlaier#endif 2963126258Smlaier{ 2964130613Smlaier struct pf_rule *nr = NULL; 2965126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2966126258Smlaier struct tcphdr *th = pd->hdr.tcp; 2967126258Smlaier u_int16_t bport, nport = 0; 2968126258Smlaier sa_family_t af = pd->af; 2969126258Smlaier int lookup = -1; 2970126258Smlaier uid_t uid; 2971126258Smlaier gid_t gid; 2972126258Smlaier struct pf_rule *r, *a = NULL; 2973126258Smlaier struct pf_ruleset *ruleset = NULL; 2974130613Smlaier struct pf_src_node *nsn = NULL; 2975126258Smlaier u_short reason; 2976126258Smlaier int rewrite = 0; 2977126258Smlaier struct pf_tag *pftag = NULL; 2978126258Smlaier int tag = -1; 2979126258Smlaier u_int16_t mss = tcp_mssdflt; 2980145836Smlaier int asd = 0; 2981126258Smlaier 2982145836Smlaier if (pf_check_congestion(ifq)) { 2983145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 2984145836Smlaier return (PF_DROP); 2985145836Smlaier } 2986145836Smlaier 2987126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2988126258Smlaier 2989126258Smlaier if (direction == PF_OUT) { 2990126258Smlaier bport = nport = th->th_sport; 2991126258Smlaier /* check outgoing packet for BINAT/NAT */ 2992130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 2993126258Smlaier saddr, th->th_sport, daddr, th->th_dport, 2994130613Smlaier &pd->naddr, &nport)) != NULL) { 2995130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 2996126258Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 2997130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 2998126258Smlaier rewrite++; 2999130613Smlaier if (nr->natpass) 3000126258Smlaier r = NULL; 3001130613Smlaier pd->nat_rule = nr; 3002126258Smlaier } 3003126258Smlaier } else { 3004126258Smlaier bport = nport = th->th_dport; 3005126258Smlaier /* check incoming packet for BINAT/RDR */ 3006130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3007130613Smlaier saddr, th->th_sport, daddr, th->th_dport, 3008130613Smlaier &pd->naddr, &nport)) != NULL) { 3009130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3010126258Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3011130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 3012126258Smlaier rewrite++; 3013130613Smlaier if (nr->natpass) 3014126258Smlaier r = NULL; 3015130613Smlaier pd->nat_rule = nr; 3016126258Smlaier } 3017126258Smlaier } 3018126258Smlaier 3019126258Smlaier while (r != NULL) { 3020126258Smlaier r->evaluations++; 3021130613Smlaier if (r->kif != NULL && 3022130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3023126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3024126258Smlaier else if (r->direction && r->direction != direction) 3025126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3026126258Smlaier else if (r->af && r->af != af) 3027126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3028126258Smlaier else if (r->proto && r->proto != IPPROTO_TCP) 3029126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3030145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg)) 3031126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3032126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3033126258Smlaier r->src.port[0], r->src.port[1], th->th_sport)) 3034126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3035145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg)) 3036126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3037126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3038126258Smlaier r->dst.port[0], r->dst.port[1], th->th_dport)) 3039126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3040126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 3041126258Smlaier r = TAILQ_NEXT(r, entries); 3042126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3043126258Smlaier r = TAILQ_NEXT(r, entries); 3044126258Smlaier else if ((r->flagset & th->th_flags) != r->flags) 3045126258Smlaier r = TAILQ_NEXT(r, entries); 3046126258Smlaier else if (r->uid.op && (lookup != -1 || (lookup = 3047135920Smlaier#ifdef __FreeBSD__ 3048135920Smlaier pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3049135920Smlaier#else 3050130613Smlaier pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3051135920Smlaier#endif 3052126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3053126258Smlaier uid)) 3054126258Smlaier r = TAILQ_NEXT(r, entries); 3055126258Smlaier else if (r->gid.op && (lookup != -1 || (lookup = 3056135920Smlaier#ifdef __FreeBSD__ 3057135920Smlaier pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3058135920Smlaier#else 3059130613Smlaier pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3060135920Smlaier#endif 3061126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3062126258Smlaier gid)) 3063126258Smlaier r = TAILQ_NEXT(r, entries); 3064145836Smlaier else if (r->prob && r->prob <= arc4random()) 3065126258Smlaier r = TAILQ_NEXT(r, entries); 3066145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 3067126258Smlaier r = TAILQ_NEXT(r, entries); 3068126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3069126258Smlaier pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3070126258Smlaier r = TAILQ_NEXT(r, entries); 3071126258Smlaier else { 3072126258Smlaier if (r->tag) 3073126258Smlaier tag = r->tag; 3074126258Smlaier if (r->anchor == NULL) { 3075126258Smlaier *rm = r; 3076126258Smlaier *am = a; 3077126258Smlaier *rsm = ruleset; 3078126258Smlaier if ((*rm)->quick) 3079126258Smlaier break; 3080126258Smlaier r = TAILQ_NEXT(r, entries); 3081126258Smlaier } else 3082145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3083145836Smlaier PF_RULESET_FILTER, &r, &a); 3084126258Smlaier } 3085145836Smlaier if (r == NULL) 3086145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 3087145836Smlaier PF_RULESET_FILTER, &r, &a); 3088126258Smlaier } 3089126258Smlaier r = *rm; 3090126258Smlaier a = *am; 3091126258Smlaier ruleset = *rsm; 3092126258Smlaier 3093126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3094126258Smlaier 3095126258Smlaier if (r->log) { 3096126258Smlaier if (rewrite) 3097126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3098130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3099126258Smlaier } 3100126258Smlaier 3101126258Smlaier if ((r->action == PF_DROP) && 3102126258Smlaier ((r->rule_flag & PFRULE_RETURNRST) || 3103126258Smlaier (r->rule_flag & PFRULE_RETURNICMP) || 3104126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3105126258Smlaier /* undo NAT changes, if they have taken place */ 3106130613Smlaier if (nr != NULL) { 3107130613Smlaier if (direction == PF_OUT) { 3108130613Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3109130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3110130613Smlaier rewrite++; 3111130613Smlaier } else { 3112130613Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3113130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3114130613Smlaier rewrite++; 3115130613Smlaier } 3116126258Smlaier } 3117126258Smlaier if (((r->rule_flag & PFRULE_RETURNRST) || 3118126258Smlaier (r->rule_flag & PFRULE_RETURN)) && 3119126258Smlaier !(th->th_flags & TH_RST)) { 3120126258Smlaier u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3121126258Smlaier 3122126258Smlaier if (th->th_flags & TH_SYN) 3123126258Smlaier ack++; 3124126258Smlaier if (th->th_flags & TH_FIN) 3125126258Smlaier ack++; 3126126258Smlaier pf_send_tcp(r, af, pd->dst, 3127126258Smlaier pd->src, th->th_dport, th->th_sport, 3128126258Smlaier ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3129145836Smlaier r->return_ttl, 1, pd->eh, kif->pfik_ifp); 3130126258Smlaier } else if ((af == AF_INET) && r->return_icmp) 3131126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3132126258Smlaier r->return_icmp & 255, af, r); 3133126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3134126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3135126258Smlaier r->return_icmp6 & 255, af, r); 3136126258Smlaier } 3137126258Smlaier 3138126258Smlaier if (r->action == PF_DROP) 3139126258Smlaier return (PF_DROP); 3140126258Smlaier 3141126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 3142126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3143126258Smlaier return (PF_DROP); 3144126258Smlaier } 3145126258Smlaier 3146130613Smlaier if (r->keep_state || nr != NULL || 3147126258Smlaier (pd->flags & PFDESC_TCP_NORM)) { 3148126258Smlaier /* create new state */ 3149126258Smlaier u_int16_t len; 3150126258Smlaier struct pf_state *s = NULL; 3151130613Smlaier struct pf_src_node *sn = NULL; 3152126258Smlaier 3153126258Smlaier len = pd->tot_len - off - (th->th_off << 2); 3154130613Smlaier 3155130613Smlaier /* check maximums */ 3156145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3157145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3158145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3159130613Smlaier goto cleanup; 3160145836Smlaier } 3161130613Smlaier /* src node for flter rule */ 3162130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3163130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3164145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3165145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3166130613Smlaier goto cleanup; 3167145836Smlaier } 3168130613Smlaier /* src node for translation rule */ 3169130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3170130613Smlaier ((direction == PF_OUT && 3171130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3172145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3173145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3174130613Smlaier goto cleanup; 3175145836Smlaier } 3176130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3177126258Smlaier if (s == NULL) { 3178145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3179130613Smlaiercleanup: 3180130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3181130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3182130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3183130613Smlaier pf_status.src_nodes--; 3184130613Smlaier pool_put(&pf_src_tree_pl, sn); 3185130613Smlaier } 3186130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3187130613Smlaier nsn->expire == 0) { 3188130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3189130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3190130613Smlaier pf_status.src_nodes--; 3191130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3192130613Smlaier } 3193126258Smlaier return (PF_DROP); 3194126258Smlaier } 3195126258Smlaier bzero(s, sizeof(*s)); 3196126258Smlaier s->rule.ptr = r; 3197130613Smlaier s->nat_rule.ptr = nr; 3198126258Smlaier s->anchor.ptr = a; 3199145836Smlaier STATE_INC_COUNTERS(s); 3200126258Smlaier s->allow_opts = r->allow_opts; 3201126258Smlaier s->log = r->log & 2; 3202126258Smlaier s->proto = IPPROTO_TCP; 3203126258Smlaier s->direction = direction; 3204126258Smlaier s->af = af; 3205126258Smlaier if (direction == PF_OUT) { 3206126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3207126258Smlaier s->gwy.port = th->th_sport; /* sport */ 3208126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3209126258Smlaier s->ext.port = th->th_dport; 3210130613Smlaier if (nr != NULL) { 3211130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3212126258Smlaier s->lan.port = bport; 3213126258Smlaier } else { 3214126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3215126258Smlaier s->lan.port = s->gwy.port; 3216126258Smlaier } 3217126258Smlaier } else { 3218126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3219126258Smlaier s->lan.port = th->th_dport; 3220126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3221126258Smlaier s->ext.port = th->th_sport; 3222130613Smlaier if (nr != NULL) { 3223130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3224126258Smlaier s->gwy.port = bport; 3225126258Smlaier } else { 3226126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3227126258Smlaier s->gwy.port = s->lan.port; 3228126258Smlaier } 3229126258Smlaier } 3230126258Smlaier 3231126258Smlaier s->src.seqlo = ntohl(th->th_seq); 3232126258Smlaier s->src.seqhi = s->src.seqlo + len + 1; 3233126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3234126258Smlaier r->keep_state == PF_STATE_MODULATE) { 3235126258Smlaier /* Generate sequence number modulator */ 3236145836Smlaier while ((s->src.seqdiff = htonl(arc4random())) == 0) 3237126258Smlaier ; 3238126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, 3239126258Smlaier htonl(s->src.seqlo + s->src.seqdiff), 0); 3240126258Smlaier rewrite = 1; 3241126258Smlaier } else 3242126258Smlaier s->src.seqdiff = 0; 3243126258Smlaier if (th->th_flags & TH_SYN) { 3244126258Smlaier s->src.seqhi++; 3245126258Smlaier s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3246126258Smlaier } 3247126258Smlaier s->src.max_win = MAX(ntohs(th->th_win), 1); 3248126258Smlaier if (s->src.wscale & PF_WSCALE_MASK) { 3249126258Smlaier /* Remove scale factor from initial window */ 3250126258Smlaier int win = s->src.max_win; 3251126258Smlaier win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3252126258Smlaier s->src.max_win = (win - 1) >> 3253126258Smlaier (s->src.wscale & PF_WSCALE_MASK); 3254126258Smlaier } 3255126258Smlaier if (th->th_flags & TH_FIN) 3256126258Smlaier s->src.seqhi++; 3257126258Smlaier s->dst.seqhi = 1; 3258126258Smlaier s->dst.max_win = 1; 3259126258Smlaier s->src.state = TCPS_SYN_SENT; 3260126258Smlaier s->dst.state = TCPS_CLOSED; 3261126261Smlaier s->creation = time_second; 3262126261Smlaier s->expire = time_second; 3263126258Smlaier s->timeout = PFTM_TCP_FIRST_PACKET; 3264126258Smlaier pf_set_rt_ifp(s, saddr); 3265130613Smlaier if (sn != NULL) { 3266130613Smlaier s->src_node = sn; 3267130613Smlaier s->src_node->states++; 3268130613Smlaier } 3269130613Smlaier if (nsn != NULL) { 3270130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3271130613Smlaier s->nat_src_node = nsn; 3272130613Smlaier s->nat_src_node->states++; 3273130613Smlaier } 3274126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3275126258Smlaier off, pd, th, &s->src, &s->dst)) { 3276126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3277130613Smlaier pf_src_tree_remove_state(s); 3278145836Smlaier STATE_DEC_COUNTERS(s); 3279126258Smlaier pool_put(&pf_state_pl, s); 3280126258Smlaier return (PF_DROP); 3281126258Smlaier } 3282126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3283145836Smlaier pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3284145836Smlaier &s->src, &s->dst, &rewrite)) { 3285145836Smlaier /* This really shouldn't happen!!! */ 3286145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 3287145836Smlaier ("pf_normalize_tcp_stateful failed on first pkt")); 3288126258Smlaier pf_normalize_tcp_cleanup(s); 3289130613Smlaier pf_src_tree_remove_state(s); 3290145836Smlaier STATE_DEC_COUNTERS(s); 3291126258Smlaier pool_put(&pf_state_pl, s); 3292126258Smlaier return (PF_DROP); 3293126258Smlaier } 3294130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3295126258Smlaier pf_normalize_tcp_cleanup(s); 3296145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3297130613Smlaier pf_src_tree_remove_state(s); 3298145836Smlaier STATE_DEC_COUNTERS(s); 3299126258Smlaier pool_put(&pf_state_pl, s); 3300126258Smlaier return (PF_DROP); 3301126258Smlaier } else 3302126258Smlaier *sm = s; 3303145836Smlaier if (tag > 0) { 3304145836Smlaier pf_tag_ref(tag); 3305145836Smlaier s->tag = tag; 3306145836Smlaier } 3307126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3308126258Smlaier r->keep_state == PF_STATE_SYNPROXY) { 3309126258Smlaier s->src.state = PF_TCPS_PROXY_SRC; 3310130613Smlaier if (nr != NULL) { 3311130613Smlaier if (direction == PF_OUT) { 3312130613Smlaier pf_change_ap(saddr, &th->th_sport, 3313130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3314130613Smlaier bport, 0, af); 3315130613Smlaier } else { 3316130613Smlaier pf_change_ap(daddr, &th->th_dport, 3317130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3318130613Smlaier bport, 0, af); 3319130613Smlaier } 3320130613Smlaier } 3321145836Smlaier s->src.seqhi = htonl(arc4random()); 3322126258Smlaier /* Find mss option */ 3323126258Smlaier mss = pf_get_mss(m, off, th->th_off, af); 3324126258Smlaier mss = pf_calc_mss(saddr, af, mss); 3325126258Smlaier mss = pf_calc_mss(daddr, af, mss); 3326126258Smlaier s->src.mss = mss; 3327126258Smlaier pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3328130613Smlaier th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3329145836Smlaier TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, NULL, NULL); 3330145836Smlaier REASON_SET(&reason, PFRES_SYNPROXY); 3331126258Smlaier return (PF_SYNPROXY_DROP); 3332126258Smlaier } 3333126258Smlaier } 3334126258Smlaier 3335126258Smlaier /* copy back packet headers if we performed NAT operations */ 3336126258Smlaier if (rewrite) 3337126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3338126258Smlaier 3339126258Smlaier return (PF_PASS); 3340126258Smlaier} 3341126258Smlaier 3342126258Smlaierint 3343126258Smlaierpf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3344130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3345135920Smlaier#ifdef __FreeBSD__ 3346135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3347145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 3348135920Smlaier#else 3349145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3350145836Smlaier struct ifqueue *ifq) 3351135920Smlaier#endif 3352126258Smlaier{ 3353130613Smlaier struct pf_rule *nr = NULL; 3354126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3355126258Smlaier struct udphdr *uh = pd->hdr.udp; 3356126258Smlaier u_int16_t bport, nport = 0; 3357126258Smlaier sa_family_t af = pd->af; 3358126258Smlaier int lookup = -1; 3359126258Smlaier uid_t uid; 3360126258Smlaier gid_t gid; 3361126258Smlaier struct pf_rule *r, *a = NULL; 3362126258Smlaier struct pf_ruleset *ruleset = NULL; 3363130613Smlaier struct pf_src_node *nsn = NULL; 3364126258Smlaier u_short reason; 3365126258Smlaier int rewrite = 0; 3366126258Smlaier struct pf_tag *pftag = NULL; 3367126258Smlaier int tag = -1; 3368145836Smlaier int asd = 0; 3369126258Smlaier 3370145836Smlaier if (pf_check_congestion(ifq)) { 3371145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3372145836Smlaier return (PF_DROP); 3373145836Smlaier } 3374145836Smlaier 3375126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3376126258Smlaier 3377126258Smlaier if (direction == PF_OUT) { 3378126258Smlaier bport = nport = uh->uh_sport; 3379126258Smlaier /* check outgoing packet for BINAT/NAT */ 3380130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3381126258Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, 3382130613Smlaier &pd->naddr, &nport)) != NULL) { 3383130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3384126258Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3385130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3386126258Smlaier rewrite++; 3387130613Smlaier if (nr->natpass) 3388126258Smlaier r = NULL; 3389130613Smlaier pd->nat_rule = nr; 3390126258Smlaier } 3391126258Smlaier } else { 3392126258Smlaier bport = nport = uh->uh_dport; 3393126258Smlaier /* check incoming packet for BINAT/RDR */ 3394130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3395130613Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3396130613Smlaier &nport)) != NULL) { 3397130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3398126258Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3399130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3400126258Smlaier rewrite++; 3401130613Smlaier if (nr->natpass) 3402126258Smlaier r = NULL; 3403130613Smlaier pd->nat_rule = nr; 3404126258Smlaier } 3405126258Smlaier } 3406126258Smlaier 3407126258Smlaier while (r != NULL) { 3408126258Smlaier r->evaluations++; 3409130613Smlaier if (r->kif != NULL && 3410130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3411126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3412126258Smlaier else if (r->direction && r->direction != direction) 3413126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3414126258Smlaier else if (r->af && r->af != af) 3415126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3416126258Smlaier else if (r->proto && r->proto != IPPROTO_UDP) 3417126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3418145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg)) 3419126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3420126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3421126258Smlaier r->src.port[0], r->src.port[1], uh->uh_sport)) 3422126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3423145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg)) 3424126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3425126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3426126258Smlaier r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3427126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3428126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 3429126258Smlaier r = TAILQ_NEXT(r, entries); 3430126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3431126258Smlaier r = TAILQ_NEXT(r, entries); 3432126258Smlaier else if (r->uid.op && (lookup != -1 || (lookup = 3433135920Smlaier#ifdef __FreeBSD__ 3434135920Smlaier pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3435135920Smlaier#else 3436130613Smlaier pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3437135920Smlaier#endif 3438126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3439126258Smlaier uid)) 3440126258Smlaier r = TAILQ_NEXT(r, entries); 3441126258Smlaier else if (r->gid.op && (lookup != -1 || (lookup = 3442135920Smlaier#ifdef __FreeBSD__ 3443135920Smlaier pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3444135920Smlaier#else 3445130613Smlaier pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3446135920Smlaier#endif 3447126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3448126258Smlaier gid)) 3449126258Smlaier r = TAILQ_NEXT(r, entries); 3450145836Smlaier else if (r->prob && r->prob <= arc4random()) 3451126258Smlaier r = TAILQ_NEXT(r, entries); 3452145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 3453126258Smlaier r = TAILQ_NEXT(r, entries); 3454126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 3455126258Smlaier r = TAILQ_NEXT(r, entries); 3456126258Smlaier else { 3457126258Smlaier if (r->tag) 3458126258Smlaier tag = r->tag; 3459126258Smlaier if (r->anchor == NULL) { 3460126258Smlaier *rm = r; 3461126258Smlaier *am = a; 3462126258Smlaier *rsm = ruleset; 3463126258Smlaier if ((*rm)->quick) 3464126258Smlaier break; 3465126258Smlaier r = TAILQ_NEXT(r, entries); 3466126258Smlaier } else 3467145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3468145836Smlaier PF_RULESET_FILTER, &r, &a); 3469126258Smlaier } 3470145836Smlaier if (r == NULL) 3471145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 3472145836Smlaier PF_RULESET_FILTER, &r, &a); 3473126258Smlaier } 3474126258Smlaier r = *rm; 3475126258Smlaier a = *am; 3476126258Smlaier ruleset = *rsm; 3477126258Smlaier 3478126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3479126258Smlaier 3480126258Smlaier if (r->log) { 3481126258Smlaier if (rewrite) 3482126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3483130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3484126258Smlaier } 3485126258Smlaier 3486126258Smlaier if ((r->action == PF_DROP) && 3487126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 3488126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3489126258Smlaier /* undo NAT changes, if they have taken place */ 3490130613Smlaier if (nr != NULL) { 3491130613Smlaier if (direction == PF_OUT) { 3492130613Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3493130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3494130613Smlaier rewrite++; 3495130613Smlaier } else { 3496130613Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3497130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3498130613Smlaier rewrite++; 3499130613Smlaier } 3500126258Smlaier } 3501126258Smlaier if ((af == AF_INET) && r->return_icmp) 3502126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3503126258Smlaier r->return_icmp & 255, af, r); 3504126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3505126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3506126258Smlaier r->return_icmp6 & 255, af, r); 3507126258Smlaier } 3508126258Smlaier 3509126258Smlaier if (r->action == PF_DROP) 3510126258Smlaier return (PF_DROP); 3511126258Smlaier 3512126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 3513126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3514126258Smlaier return (PF_DROP); 3515126258Smlaier } 3516126258Smlaier 3517130613Smlaier if (r->keep_state || nr != NULL) { 3518126258Smlaier /* create new state */ 3519126258Smlaier struct pf_state *s = NULL; 3520130613Smlaier struct pf_src_node *sn = NULL; 3521126258Smlaier 3522130613Smlaier /* check maximums */ 3523145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3524145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3525145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3526130613Smlaier goto cleanup; 3527145836Smlaier } 3528130613Smlaier /* src node for flter rule */ 3529130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3530130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3531145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3532145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3533130613Smlaier goto cleanup; 3534145836Smlaier } 3535130613Smlaier /* src node for translation rule */ 3536130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3537130613Smlaier ((direction == PF_OUT && 3538130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3539145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3540145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3541130613Smlaier goto cleanup; 3542145836Smlaier } 3543130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3544126258Smlaier if (s == NULL) { 3545145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3546130613Smlaiercleanup: 3547130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3548130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3549130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3550130613Smlaier pf_status.src_nodes--; 3551130613Smlaier pool_put(&pf_src_tree_pl, sn); 3552130613Smlaier } 3553130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3554130613Smlaier nsn->expire == 0) { 3555130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3556130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3557130613Smlaier pf_status.src_nodes--; 3558130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3559130613Smlaier } 3560126258Smlaier return (PF_DROP); 3561126258Smlaier } 3562126258Smlaier bzero(s, sizeof(*s)); 3563126258Smlaier s->rule.ptr = r; 3564130613Smlaier s->nat_rule.ptr = nr; 3565126258Smlaier s->anchor.ptr = a; 3566145836Smlaier STATE_INC_COUNTERS(s); 3567126258Smlaier s->allow_opts = r->allow_opts; 3568126258Smlaier s->log = r->log & 2; 3569126258Smlaier s->proto = IPPROTO_UDP; 3570126258Smlaier s->direction = direction; 3571126258Smlaier s->af = af; 3572126258Smlaier if (direction == PF_OUT) { 3573126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3574126258Smlaier s->gwy.port = uh->uh_sport; 3575126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3576126258Smlaier s->ext.port = uh->uh_dport; 3577130613Smlaier if (nr != NULL) { 3578130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3579126258Smlaier s->lan.port = bport; 3580126258Smlaier } else { 3581126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3582126258Smlaier s->lan.port = s->gwy.port; 3583126258Smlaier } 3584126258Smlaier } else { 3585126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3586126258Smlaier s->lan.port = uh->uh_dport; 3587126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3588126258Smlaier s->ext.port = uh->uh_sport; 3589130613Smlaier if (nr != NULL) { 3590130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3591126258Smlaier s->gwy.port = bport; 3592126258Smlaier } else { 3593126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3594126258Smlaier s->gwy.port = s->lan.port; 3595126258Smlaier } 3596126258Smlaier } 3597126258Smlaier s->src.state = PFUDPS_SINGLE; 3598126258Smlaier s->dst.state = PFUDPS_NO_TRAFFIC; 3599126261Smlaier s->creation = time_second; 3600126261Smlaier s->expire = time_second; 3601126258Smlaier s->timeout = PFTM_UDP_FIRST_PACKET; 3602126258Smlaier pf_set_rt_ifp(s, saddr); 3603130613Smlaier if (sn != NULL) { 3604130613Smlaier s->src_node = sn; 3605130613Smlaier s->src_node->states++; 3606130613Smlaier } 3607130613Smlaier if (nsn != NULL) { 3608130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3609130613Smlaier s->nat_src_node = nsn; 3610130613Smlaier s->nat_src_node->states++; 3611130613Smlaier } 3612130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3613145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3614130613Smlaier pf_src_tree_remove_state(s); 3615145836Smlaier STATE_DEC_COUNTERS(s); 3616126258Smlaier pool_put(&pf_state_pl, s); 3617126258Smlaier return (PF_DROP); 3618126258Smlaier } else 3619126258Smlaier *sm = s; 3620145836Smlaier if (tag > 0) { 3621145836Smlaier pf_tag_ref(tag); 3622145836Smlaier s->tag = tag; 3623145836Smlaier } 3624126258Smlaier } 3625126258Smlaier 3626126258Smlaier /* copy back packet headers if we performed NAT operations */ 3627126258Smlaier if (rewrite) 3628126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3629126258Smlaier 3630126258Smlaier return (PF_PASS); 3631126258Smlaier} 3632126258Smlaier 3633126258Smlaierint 3634126258Smlaierpf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 3635130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3636145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3637145836Smlaier struct ifqueue *ifq) 3638126258Smlaier{ 3639130613Smlaier struct pf_rule *nr = NULL; 3640126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3641126258Smlaier struct pf_rule *r, *a = NULL; 3642126258Smlaier struct pf_ruleset *ruleset = NULL; 3643130613Smlaier struct pf_src_node *nsn = NULL; 3644126258Smlaier u_short reason; 3645149884Smlaier u_int16_t icmpid, bport, nport = 0; 3646126258Smlaier sa_family_t af = pd->af; 3647127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 3648127629Smlaier u_int8_t icmpcode = 0; /* make the compiler happy */ 3649126258Smlaier int state_icmp = 0; 3650126258Smlaier struct pf_tag *pftag = NULL; 3651126258Smlaier int tag = -1; 3652126258Smlaier#ifdef INET6 3653126258Smlaier int rewrite = 0; 3654126258Smlaier#endif /* INET6 */ 3655145836Smlaier int asd = 0; 3656126258Smlaier 3657145836Smlaier if (pf_check_congestion(ifq)) { 3658145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3659145836Smlaier return (PF_DROP); 3660145836Smlaier } 3661145836Smlaier 3662126258Smlaier switch (pd->proto) { 3663126258Smlaier#ifdef INET 3664126258Smlaier case IPPROTO_ICMP: 3665126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 3666126258Smlaier icmpcode = pd->hdr.icmp->icmp_code; 3667126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 3668126258Smlaier 3669126258Smlaier if (icmptype == ICMP_UNREACH || 3670126258Smlaier icmptype == ICMP_SOURCEQUENCH || 3671126258Smlaier icmptype == ICMP_REDIRECT || 3672126258Smlaier icmptype == ICMP_TIMXCEED || 3673126258Smlaier icmptype == ICMP_PARAMPROB) 3674126258Smlaier state_icmp++; 3675126258Smlaier break; 3676126258Smlaier#endif /* INET */ 3677126258Smlaier#ifdef INET6 3678126258Smlaier case IPPROTO_ICMPV6: 3679126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 3680126258Smlaier icmpcode = pd->hdr.icmp6->icmp6_code; 3681126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 3682126258Smlaier 3683126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 3684126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 3685126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 3686126258Smlaier icmptype == ICMP6_PARAM_PROB) 3687126258Smlaier state_icmp++; 3688126258Smlaier break; 3689126258Smlaier#endif /* INET6 */ 3690126258Smlaier } 3691126258Smlaier 3692126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3693126258Smlaier 3694126258Smlaier if (direction == PF_OUT) { 3695149884Smlaier bport = nport = icmpid; 3696126258Smlaier /* check outgoing packet for BINAT/NAT */ 3697130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3698149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 3699149884Smlaier NULL) { 3700130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3701126258Smlaier switch (af) { 3702126258Smlaier#ifdef INET 3703126258Smlaier case AF_INET: 3704126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3705130613Smlaier pd->naddr.v4.s_addr, 0); 3706149884Smlaier pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3707149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 3708149884Smlaier pd->hdr.icmp->icmp_id = nport; 3709149884Smlaier m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 3710126258Smlaier break; 3711126258Smlaier#endif /* INET */ 3712126258Smlaier#ifdef INET6 3713126258Smlaier case AF_INET6: 3714126258Smlaier pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3715130613Smlaier &pd->naddr, 0); 3716126258Smlaier rewrite++; 3717126258Smlaier break; 3718126258Smlaier#endif /* INET6 */ 3719126258Smlaier } 3720130613Smlaier if (nr->natpass) 3721126258Smlaier r = NULL; 3722130613Smlaier pd->nat_rule = nr; 3723126258Smlaier } 3724126258Smlaier } else { 3725149884Smlaier bport = nport = icmpid; 3726126258Smlaier /* check incoming packet for BINAT/RDR */ 3727130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3728149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 3729149884Smlaier NULL) { 3730130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3731126258Smlaier switch (af) { 3732126258Smlaier#ifdef INET 3733126258Smlaier case AF_INET: 3734126258Smlaier pf_change_a(&daddr->v4.s_addr, 3735130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 3736126258Smlaier break; 3737126258Smlaier#endif /* INET */ 3738126258Smlaier#ifdef INET6 3739126258Smlaier case AF_INET6: 3740126258Smlaier pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3741130613Smlaier &pd->naddr, 0); 3742126258Smlaier rewrite++; 3743126258Smlaier break; 3744126258Smlaier#endif /* INET6 */ 3745126258Smlaier } 3746130613Smlaier if (nr->natpass) 3747126258Smlaier r = NULL; 3748130613Smlaier pd->nat_rule = nr; 3749126258Smlaier } 3750126258Smlaier } 3751126258Smlaier 3752126258Smlaier while (r != NULL) { 3753126258Smlaier r->evaluations++; 3754130613Smlaier if (r->kif != NULL && 3755130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3756126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3757126258Smlaier else if (r->direction && r->direction != direction) 3758126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3759126258Smlaier else if (r->af && r->af != af) 3760126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3761126258Smlaier else if (r->proto && r->proto != pd->proto) 3762126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3763145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg)) 3764126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3765145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg)) 3766126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3767126258Smlaier else if (r->type && r->type != icmptype + 1) 3768126258Smlaier r = TAILQ_NEXT(r, entries); 3769126258Smlaier else if (r->code && r->code != icmpcode + 1) 3770126258Smlaier r = TAILQ_NEXT(r, entries); 3771126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 3772126258Smlaier r = TAILQ_NEXT(r, entries); 3773126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3774126258Smlaier r = TAILQ_NEXT(r, entries); 3775145836Smlaier else if (r->prob && r->prob <= arc4random()) 3776126258Smlaier r = TAILQ_NEXT(r, entries); 3777145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 3778126258Smlaier r = TAILQ_NEXT(r, entries); 3779126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 3780126258Smlaier r = TAILQ_NEXT(r, entries); 3781126258Smlaier else { 3782126258Smlaier if (r->tag) 3783126258Smlaier tag = r->tag; 3784126258Smlaier if (r->anchor == NULL) { 3785126258Smlaier *rm = r; 3786126258Smlaier *am = a; 3787126258Smlaier *rsm = ruleset; 3788126258Smlaier if ((*rm)->quick) 3789126258Smlaier break; 3790126258Smlaier r = TAILQ_NEXT(r, entries); 3791126258Smlaier } else 3792145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3793145836Smlaier PF_RULESET_FILTER, &r, &a); 3794126258Smlaier } 3795145836Smlaier if (r == NULL) 3796145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 3797145836Smlaier PF_RULESET_FILTER, &r, &a); 3798126258Smlaier } 3799126258Smlaier r = *rm; 3800126258Smlaier a = *am; 3801126258Smlaier ruleset = *rsm; 3802126258Smlaier 3803126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3804126258Smlaier 3805126258Smlaier if (r->log) { 3806126258Smlaier#ifdef INET6 3807126258Smlaier if (rewrite) 3808126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 3809126261Smlaier (caddr_t)pd->hdr.icmp6); 3810126258Smlaier#endif /* INET6 */ 3811130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3812126258Smlaier } 3813126258Smlaier 3814126258Smlaier if (r->action != PF_PASS) 3815126258Smlaier return (PF_DROP); 3816126258Smlaier 3817126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 3818126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3819126258Smlaier return (PF_DROP); 3820126258Smlaier } 3821126258Smlaier 3822130613Smlaier if (!state_icmp && (r->keep_state || nr != NULL)) { 3823126258Smlaier /* create new state */ 3824126258Smlaier struct pf_state *s = NULL; 3825130613Smlaier struct pf_src_node *sn = NULL; 3826126258Smlaier 3827130613Smlaier /* check maximums */ 3828145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3829145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3830145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3831130613Smlaier goto cleanup; 3832145836Smlaier } 3833130613Smlaier /* src node for flter rule */ 3834130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3835130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3836145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3837145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3838130613Smlaier goto cleanup; 3839145836Smlaier } 3840130613Smlaier /* src node for translation rule */ 3841130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3842130613Smlaier ((direction == PF_OUT && 3843130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3844145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3845145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3846130613Smlaier goto cleanup; 3847145836Smlaier } 3848130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3849126258Smlaier if (s == NULL) { 3850145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3851130613Smlaiercleanup: 3852130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3853130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3854130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3855130613Smlaier pf_status.src_nodes--; 3856130613Smlaier pool_put(&pf_src_tree_pl, sn); 3857130613Smlaier } 3858130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3859130613Smlaier nsn->expire == 0) { 3860130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3861130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3862130613Smlaier pf_status.src_nodes--; 3863130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3864130613Smlaier } 3865126258Smlaier return (PF_DROP); 3866126258Smlaier } 3867126258Smlaier bzero(s, sizeof(*s)); 3868126258Smlaier s->rule.ptr = r; 3869130613Smlaier s->nat_rule.ptr = nr; 3870126258Smlaier s->anchor.ptr = a; 3871145836Smlaier STATE_INC_COUNTERS(s); 3872126258Smlaier s->allow_opts = r->allow_opts; 3873126258Smlaier s->log = r->log & 2; 3874126258Smlaier s->proto = pd->proto; 3875126258Smlaier s->direction = direction; 3876126258Smlaier s->af = af; 3877126258Smlaier if (direction == PF_OUT) { 3878126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3879149884Smlaier s->gwy.port = nport; 3880126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3881149884Smlaier s->ext.port = 0; 3882149884Smlaier if (nr != NULL) { 3883130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3884149884Smlaier s->lan.port = bport; 3885149884Smlaier } else { 3886126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3887149884Smlaier s->lan.port = s->gwy.port; 3888149884Smlaier } 3889126258Smlaier } else { 3890126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3891149884Smlaier s->lan.port = nport; 3892126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3893149884Smlaier s->ext.port = 0; 3894149884Smlaier if (nr != NULL) { 3895130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3896149884Smlaier s->gwy.port = bport; 3897149884Smlaier } else { 3898126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3899149884Smlaier s->gwy.port = s->lan.port; 3900149884Smlaier } 3901126258Smlaier } 3902126261Smlaier s->creation = time_second; 3903126261Smlaier s->expire = time_second; 3904126258Smlaier s->timeout = PFTM_ICMP_FIRST_PACKET; 3905126258Smlaier pf_set_rt_ifp(s, saddr); 3906130613Smlaier if (sn != NULL) { 3907130613Smlaier s->src_node = sn; 3908130613Smlaier s->src_node->states++; 3909130613Smlaier } 3910130613Smlaier if (nsn != NULL) { 3911130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3912130613Smlaier s->nat_src_node = nsn; 3913130613Smlaier s->nat_src_node->states++; 3914130613Smlaier } 3915130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3916145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3917130613Smlaier pf_src_tree_remove_state(s); 3918145836Smlaier STATE_DEC_COUNTERS(s); 3919126258Smlaier pool_put(&pf_state_pl, s); 3920126258Smlaier return (PF_DROP); 3921126258Smlaier } else 3922126258Smlaier *sm = s; 3923145836Smlaier if (tag > 0) { 3924145836Smlaier pf_tag_ref(tag); 3925145836Smlaier s->tag = tag; 3926145836Smlaier } 3927126258Smlaier } 3928126258Smlaier 3929126258Smlaier#ifdef INET6 3930126258Smlaier /* copy back packet headers if we performed IPv6 NAT operations */ 3931126258Smlaier if (rewrite) 3932126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 3933126261Smlaier (caddr_t)pd->hdr.icmp6); 3934126258Smlaier#endif /* INET6 */ 3935126258Smlaier 3936126258Smlaier return (PF_PASS); 3937126258Smlaier} 3938126258Smlaier 3939126258Smlaierint 3940126258Smlaierpf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 3941130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3942145836Smlaier struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 3943126258Smlaier{ 3944130613Smlaier struct pf_rule *nr = NULL; 3945126258Smlaier struct pf_rule *r, *a = NULL; 3946126258Smlaier struct pf_ruleset *ruleset = NULL; 3947130613Smlaier struct pf_src_node *nsn = NULL; 3948126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3949126258Smlaier sa_family_t af = pd->af; 3950126258Smlaier u_short reason; 3951126258Smlaier struct pf_tag *pftag = NULL; 3952126258Smlaier int tag = -1; 3953145836Smlaier int asd = 0; 3954126258Smlaier 3955145836Smlaier if (pf_check_congestion(ifq)) { 3956145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3957145836Smlaier return (PF_DROP); 3958145836Smlaier } 3959145836Smlaier 3960126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3961126258Smlaier 3962126258Smlaier if (direction == PF_OUT) { 3963126258Smlaier /* check outgoing packet for BINAT/NAT */ 3964130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3965130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 3966130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3967126258Smlaier switch (af) { 3968126258Smlaier#ifdef INET 3969126258Smlaier case AF_INET: 3970126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3971130613Smlaier pd->naddr.v4.s_addr, 0); 3972126258Smlaier break; 3973126258Smlaier#endif /* INET */ 3974126258Smlaier#ifdef INET6 3975126258Smlaier case AF_INET6: 3976130613Smlaier PF_ACPY(saddr, &pd->naddr, af); 3977126258Smlaier break; 3978126258Smlaier#endif /* INET6 */ 3979126258Smlaier } 3980130613Smlaier if (nr->natpass) 3981126258Smlaier r = NULL; 3982130613Smlaier pd->nat_rule = nr; 3983126258Smlaier } 3984126258Smlaier } else { 3985126258Smlaier /* check incoming packet for BINAT/RDR */ 3986130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3987130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 3988130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3989126258Smlaier switch (af) { 3990126258Smlaier#ifdef INET 3991126258Smlaier case AF_INET: 3992126258Smlaier pf_change_a(&daddr->v4.s_addr, 3993130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 3994126258Smlaier break; 3995126258Smlaier#endif /* INET */ 3996126258Smlaier#ifdef INET6 3997126258Smlaier case AF_INET6: 3998130613Smlaier PF_ACPY(daddr, &pd->naddr, af); 3999126258Smlaier break; 4000126258Smlaier#endif /* INET6 */ 4001126258Smlaier } 4002130613Smlaier if (nr->natpass) 4003126258Smlaier r = NULL; 4004130613Smlaier pd->nat_rule = nr; 4005126258Smlaier } 4006126258Smlaier } 4007126258Smlaier 4008126258Smlaier while (r != NULL) { 4009126258Smlaier r->evaluations++; 4010130613Smlaier if (r->kif != NULL && 4011130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 4012126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4013126258Smlaier else if (r->direction && r->direction != direction) 4014126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4015126258Smlaier else if (r->af && r->af != af) 4016126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4017126258Smlaier else if (r->proto && r->proto != pd->proto) 4018126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4019145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg)) 4020126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4021145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg)) 4022126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4023126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 4024126258Smlaier r = TAILQ_NEXT(r, entries); 4025126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 4026126258Smlaier r = TAILQ_NEXT(r, entries); 4027145836Smlaier else if (r->prob && r->prob <= arc4random()) 4028126258Smlaier r = TAILQ_NEXT(r, entries); 4029145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 4030126258Smlaier r = TAILQ_NEXT(r, entries); 4031126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4032126258Smlaier r = TAILQ_NEXT(r, entries); 4033126258Smlaier else { 4034126258Smlaier if (r->tag) 4035126258Smlaier tag = r->tag; 4036126258Smlaier if (r->anchor == NULL) { 4037126258Smlaier *rm = r; 4038126258Smlaier *am = a; 4039126258Smlaier *rsm = ruleset; 4040126258Smlaier if ((*rm)->quick) 4041126258Smlaier break; 4042126258Smlaier r = TAILQ_NEXT(r, entries); 4043126258Smlaier } else 4044145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4045145836Smlaier PF_RULESET_FILTER, &r, &a); 4046126258Smlaier } 4047145836Smlaier if (r == NULL) 4048145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 4049145836Smlaier PF_RULESET_FILTER, &r, &a); 4050126258Smlaier } 4051126258Smlaier r = *rm; 4052126258Smlaier a = *am; 4053126258Smlaier ruleset = *rsm; 4054126258Smlaier 4055126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4056130613Smlaier 4057126258Smlaier if (r->log) 4058130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 4059126258Smlaier 4060126258Smlaier if ((r->action == PF_DROP) && 4061126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 4062126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 4063126258Smlaier struct pf_addr *a = NULL; 4064126258Smlaier 4065130613Smlaier if (nr != NULL) { 4066130613Smlaier if (direction == PF_OUT) 4067130613Smlaier a = saddr; 4068130613Smlaier else 4069130613Smlaier a = daddr; 4070130613Smlaier } 4071126258Smlaier if (a != NULL) { 4072126258Smlaier switch (af) { 4073126258Smlaier#ifdef INET 4074126258Smlaier case AF_INET: 4075126258Smlaier pf_change_a(&a->v4.s_addr, pd->ip_sum, 4076130613Smlaier pd->baddr.v4.s_addr, 0); 4077126258Smlaier break; 4078126258Smlaier#endif /* INET */ 4079126258Smlaier#ifdef INET6 4080126258Smlaier case AF_INET6: 4081130613Smlaier PF_ACPY(a, &pd->baddr, af); 4082126258Smlaier break; 4083126258Smlaier#endif /* INET6 */ 4084126258Smlaier } 4085126258Smlaier } 4086126258Smlaier if ((af == AF_INET) && r->return_icmp) 4087126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 4088126258Smlaier r->return_icmp & 255, af, r); 4089126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 4090126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 4091126258Smlaier r->return_icmp6 & 255, af, r); 4092126258Smlaier } 4093126258Smlaier 4094126258Smlaier if (r->action != PF_PASS) 4095126258Smlaier return (PF_DROP); 4096126258Smlaier 4097126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 4098126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4099126258Smlaier return (PF_DROP); 4100126258Smlaier } 4101126258Smlaier 4102130613Smlaier if (r->keep_state || nr != NULL) { 4103126258Smlaier /* create new state */ 4104126258Smlaier struct pf_state *s = NULL; 4105130613Smlaier struct pf_src_node *sn = NULL; 4106126258Smlaier 4107130613Smlaier /* check maximums */ 4108145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 4109145836Smlaier pf_status.lcounters[LCNT_STATES]++; 4110145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 4111130613Smlaier goto cleanup; 4112145836Smlaier } 4113130613Smlaier /* src node for flter rule */ 4114130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 4115130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 4116145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 4117145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4118130613Smlaier goto cleanup; 4119145836Smlaier } 4120130613Smlaier /* src node for translation rule */ 4121130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4122130613Smlaier ((direction == PF_OUT && 4123130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4124145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4125145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4126130613Smlaier goto cleanup; 4127145836Smlaier } 4128130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 4129126258Smlaier if (s == NULL) { 4130145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 4131130613Smlaiercleanup: 4132130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4133130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4134130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4135130613Smlaier pf_status.src_nodes--; 4136130613Smlaier pool_put(&pf_src_tree_pl, sn); 4137130613Smlaier } 4138130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 4139130613Smlaier nsn->expire == 0) { 4140130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4141130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4142130613Smlaier pf_status.src_nodes--; 4143130613Smlaier pool_put(&pf_src_tree_pl, nsn); 4144130613Smlaier } 4145126258Smlaier return (PF_DROP); 4146126258Smlaier } 4147126258Smlaier bzero(s, sizeof(*s)); 4148126258Smlaier s->rule.ptr = r; 4149130613Smlaier s->nat_rule.ptr = nr; 4150126258Smlaier s->anchor.ptr = a; 4151145836Smlaier STATE_INC_COUNTERS(s); 4152126258Smlaier s->allow_opts = r->allow_opts; 4153126258Smlaier s->log = r->log & 2; 4154126258Smlaier s->proto = pd->proto; 4155126258Smlaier s->direction = direction; 4156126258Smlaier s->af = af; 4157126258Smlaier if (direction == PF_OUT) { 4158126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 4159126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 4160130613Smlaier if (nr != NULL) 4161130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 4162126258Smlaier else 4163126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4164126258Smlaier } else { 4165126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 4166126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 4167130613Smlaier if (nr != NULL) 4168130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4169126258Smlaier else 4170126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4171126258Smlaier } 4172126258Smlaier s->src.state = PFOTHERS_SINGLE; 4173126258Smlaier s->dst.state = PFOTHERS_NO_TRAFFIC; 4174126261Smlaier s->creation = time_second; 4175126261Smlaier s->expire = time_second; 4176126258Smlaier s->timeout = PFTM_OTHER_FIRST_PACKET; 4177126258Smlaier pf_set_rt_ifp(s, saddr); 4178130613Smlaier if (sn != NULL) { 4179130613Smlaier s->src_node = sn; 4180130613Smlaier s->src_node->states++; 4181130613Smlaier } 4182130613Smlaier if (nsn != NULL) { 4183130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 4184130613Smlaier s->nat_src_node = nsn; 4185130613Smlaier s->nat_src_node->states++; 4186130613Smlaier } 4187130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4188145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 4189130613Smlaier pf_src_tree_remove_state(s); 4190145836Smlaier STATE_DEC_COUNTERS(s); 4191126258Smlaier pool_put(&pf_state_pl, s); 4192126258Smlaier return (PF_DROP); 4193126258Smlaier } else 4194126258Smlaier *sm = s; 4195145836Smlaier if (tag > 0) { 4196145836Smlaier pf_tag_ref(tag); 4197145836Smlaier s->tag = tag; 4198145836Smlaier } 4199126258Smlaier } 4200126258Smlaier 4201126258Smlaier return (PF_PASS); 4202126258Smlaier} 4203126258Smlaier 4204126258Smlaierint 4205130613Smlaierpf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4206126258Smlaier struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4207126258Smlaier struct pf_ruleset **rsm) 4208126258Smlaier{ 4209126258Smlaier struct pf_rule *r, *a = NULL; 4210126258Smlaier struct pf_ruleset *ruleset = NULL; 4211126258Smlaier sa_family_t af = pd->af; 4212126258Smlaier u_short reason; 4213126258Smlaier struct pf_tag *pftag = NULL; 4214126258Smlaier int tag = -1; 4215145836Smlaier int asd = 0; 4216126258Smlaier 4217126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4218126258Smlaier while (r != NULL) { 4219126258Smlaier r->evaluations++; 4220130613Smlaier if (r->kif != NULL && 4221130613Smlaier (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 4222126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4223126258Smlaier else if (r->direction && r->direction != direction) 4224126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4225126258Smlaier else if (r->af && r->af != af) 4226126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4227126258Smlaier else if (r->proto && r->proto != pd->proto) 4228126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4229145836Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg)) 4230126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4231145836Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg)) 4232126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4233126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 4234126258Smlaier r = TAILQ_NEXT(r, entries); 4235126258Smlaier else if (r->src.port_op || r->dst.port_op || 4236126258Smlaier r->flagset || r->type || r->code || 4237126258Smlaier r->os_fingerprint != PF_OSFP_ANY) 4238126258Smlaier r = TAILQ_NEXT(r, entries); 4239145836Smlaier else if (r->prob && r->prob <= arc4random()) 4240126258Smlaier r = TAILQ_NEXT(r, entries); 4241145836Smlaier else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 4242126258Smlaier r = TAILQ_NEXT(r, entries); 4243126258Smlaier else { 4244126258Smlaier if (r->anchor == NULL) { 4245126258Smlaier *rm = r; 4246126258Smlaier *am = a; 4247126258Smlaier *rsm = ruleset; 4248126258Smlaier if ((*rm)->quick) 4249126258Smlaier break; 4250126258Smlaier r = TAILQ_NEXT(r, entries); 4251126258Smlaier } else 4252145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4253145836Smlaier PF_RULESET_FILTER, &r, &a); 4254126258Smlaier } 4255145836Smlaier if (r == NULL) 4256145836Smlaier pf_step_out_of_anchor(&asd, &ruleset, 4257145836Smlaier PF_RULESET_FILTER, &r, &a); 4258126258Smlaier } 4259126258Smlaier r = *rm; 4260126258Smlaier a = *am; 4261126258Smlaier ruleset = *rsm; 4262126258Smlaier 4263126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4264130613Smlaier 4265126258Smlaier if (r->log) 4266130613Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 4267126258Smlaier 4268126258Smlaier if (r->action != PF_PASS) 4269126258Smlaier return (PF_DROP); 4270126258Smlaier 4271126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 4272126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4273126258Smlaier return (PF_DROP); 4274126258Smlaier } 4275126258Smlaier 4276126258Smlaier return (PF_PASS); 4277126258Smlaier} 4278126258Smlaier 4279126258Smlaierint 4280130613Smlaierpf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4281130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4282126258Smlaier u_short *reason) 4283126258Smlaier{ 4284130613Smlaier struct pf_state key; 4285126258Smlaier struct tcphdr *th = pd->hdr.tcp; 4286126258Smlaier u_int16_t win = ntohs(th->th_win); 4287145836Smlaier u_int32_t ack, end, seq, orig_seq; 4288126258Smlaier u_int8_t sws, dws; 4289130613Smlaier int ackskew; 4290126258Smlaier int copyback = 0; 4291126258Smlaier struct pf_state_peer *src, *dst; 4292126258Smlaier 4293126258Smlaier key.af = pd->af; 4294126258Smlaier key.proto = IPPROTO_TCP; 4295130613Smlaier if (direction == PF_IN) { 4296130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 4297130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4298130613Smlaier key.ext.port = th->th_sport; 4299130613Smlaier key.gwy.port = th->th_dport; 4300130613Smlaier } else { 4301130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 4302130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 4303130613Smlaier key.lan.port = th->th_sport; 4304130613Smlaier key.ext.port = th->th_dport; 4305130613Smlaier } 4306126258Smlaier 4307126258Smlaier STATE_LOOKUP(); 4308126258Smlaier 4309126258Smlaier if (direction == (*state)->direction) { 4310126258Smlaier src = &(*state)->src; 4311126258Smlaier dst = &(*state)->dst; 4312126258Smlaier } else { 4313126258Smlaier src = &(*state)->dst; 4314126258Smlaier dst = &(*state)->src; 4315126258Smlaier } 4316126258Smlaier 4317126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4318145836Smlaier if (direction != (*state)->direction) { 4319145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4320126258Smlaier return (PF_SYNPROXY_DROP); 4321145836Smlaier } 4322126258Smlaier if (th->th_flags & TH_SYN) { 4323145836Smlaier if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4324145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4325126258Smlaier return (PF_DROP); 4326145836Smlaier } 4327126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4328126258Smlaier pd->src, th->th_dport, th->th_sport, 4329126258Smlaier (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4330145836Smlaier TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4331145836Smlaier NULL, NULL); 4332145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4333126258Smlaier return (PF_SYNPROXY_DROP); 4334126258Smlaier } else if (!(th->th_flags & TH_ACK) || 4335126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4336145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4337145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4338126258Smlaier return (PF_DROP); 4339145836Smlaier } else if ((*state)->src_node != NULL && 4340145836Smlaier pf_src_connlimit(state)) { 4341145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4342145836Smlaier return (PF_DROP); 4343145836Smlaier } else 4344126258Smlaier (*state)->src.state = PF_TCPS_PROXY_DST; 4345126258Smlaier } 4346126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4347126258Smlaier struct pf_state_host *src, *dst; 4348126258Smlaier 4349126258Smlaier if (direction == PF_OUT) { 4350126258Smlaier src = &(*state)->gwy; 4351126258Smlaier dst = &(*state)->ext; 4352126258Smlaier } else { 4353126258Smlaier src = &(*state)->ext; 4354126258Smlaier dst = &(*state)->lan; 4355126258Smlaier } 4356126258Smlaier if (direction == (*state)->direction) { 4357126258Smlaier if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4358126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4359145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4360145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4361126258Smlaier return (PF_DROP); 4362145836Smlaier } 4363126258Smlaier (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4364126258Smlaier if ((*state)->dst.seqhi == 1) 4365145836Smlaier (*state)->dst.seqhi = htonl(arc4random()); 4366126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4367126258Smlaier &dst->addr, src->port, dst->port, 4368130613Smlaier (*state)->dst.seqhi, 0, TH_SYN, 0, 4369145836Smlaier (*state)->src.mss, 0, 0, NULL, NULL); 4370145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4371126258Smlaier return (PF_SYNPROXY_DROP); 4372126258Smlaier } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4373126258Smlaier (TH_SYN|TH_ACK)) || 4374145836Smlaier (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4375145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4376126258Smlaier return (PF_DROP); 4377145836Smlaier } else { 4378126258Smlaier (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4379126258Smlaier (*state)->dst.seqlo = ntohl(th->th_seq); 4380126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4381126258Smlaier pd->src, th->th_dport, th->th_sport, 4382126258Smlaier ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4383145836Smlaier TH_ACK, (*state)->src.max_win, 0, 0, 0, 4384145836Smlaier NULL, NULL); 4385126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4386126258Smlaier &dst->addr, src->port, dst->port, 4387126258Smlaier (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4388145836Smlaier TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4389145836Smlaier NULL, NULL); 4390126258Smlaier (*state)->src.seqdiff = (*state)->dst.seqhi - 4391126258Smlaier (*state)->src.seqlo; 4392126258Smlaier (*state)->dst.seqdiff = (*state)->src.seqhi - 4393126258Smlaier (*state)->dst.seqlo; 4394126258Smlaier (*state)->src.seqhi = (*state)->src.seqlo + 4395145875Smlaier (*state)->dst.max_win; 4396145875Smlaier (*state)->dst.seqhi = (*state)->dst.seqlo + 4397145836Smlaier (*state)->src.max_win; 4398126258Smlaier (*state)->src.wscale = (*state)->dst.wscale = 0; 4399126258Smlaier (*state)->src.state = (*state)->dst.state = 4400126258Smlaier TCPS_ESTABLISHED; 4401145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4402126258Smlaier return (PF_SYNPROXY_DROP); 4403126258Smlaier } 4404126258Smlaier } 4405126258Smlaier 4406126258Smlaier if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4407126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4408126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4409126258Smlaier } else 4410126258Smlaier sws = dws = 0; 4411126258Smlaier 4412126258Smlaier /* 4413126258Smlaier * Sequence tracking algorithm from Guido van Rooij's paper: 4414126258Smlaier * http://www.madison-gurkha.com/publications/tcp_filtering/ 4415126258Smlaier * tcp_filtering.ps 4416126258Smlaier */ 4417126258Smlaier 4418145836Smlaier orig_seq = seq = ntohl(th->th_seq); 4419126258Smlaier if (src->seqlo == 0) { 4420126258Smlaier /* First packet from this end. Set its state */ 4421126258Smlaier 4422126258Smlaier if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4423126258Smlaier src->scrub == NULL) { 4424126258Smlaier if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4425126258Smlaier REASON_SET(reason, PFRES_MEMORY); 4426126258Smlaier return (PF_DROP); 4427126258Smlaier } 4428126258Smlaier } 4429126258Smlaier 4430126258Smlaier /* Deferred generation of sequence number modulator */ 4431126258Smlaier if (dst->seqdiff && !src->seqdiff) { 4432145836Smlaier while ((src->seqdiff = htonl(arc4random())) == 0) 4433126258Smlaier ; 4434126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4435126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4436126258Smlaier src->seqdiff), 0); 4437126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4438126258Smlaier copyback = 1; 4439126258Smlaier } else { 4440126258Smlaier ack = ntohl(th->th_ack); 4441126258Smlaier } 4442126258Smlaier 4443126258Smlaier end = seq + pd->p_len; 4444126258Smlaier if (th->th_flags & TH_SYN) { 4445126258Smlaier end++; 4446126258Smlaier if (dst->wscale & PF_WSCALE_FLAG) { 4447126258Smlaier src->wscale = pf_get_wscale(m, off, th->th_off, 4448126258Smlaier pd->af); 4449126258Smlaier if (src->wscale & PF_WSCALE_FLAG) { 4450126258Smlaier /* Remove scale factor from initial 4451126258Smlaier * window */ 4452126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4453126258Smlaier win = ((u_int32_t)win + (1 << sws) - 1) 4454126258Smlaier >> sws; 4455126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4456126258Smlaier } else { 4457126258Smlaier /* fixup other window */ 4458126258Smlaier dst->max_win <<= dst->wscale & 4459126258Smlaier PF_WSCALE_MASK; 4460126258Smlaier /* in case of a retrans SYN|ACK */ 4461126258Smlaier dst->wscale = 0; 4462126258Smlaier } 4463126258Smlaier } 4464126258Smlaier } 4465126258Smlaier if (th->th_flags & TH_FIN) 4466126258Smlaier end++; 4467126258Smlaier 4468126258Smlaier src->seqlo = seq; 4469126258Smlaier if (src->state < TCPS_SYN_SENT) 4470126258Smlaier src->state = TCPS_SYN_SENT; 4471126258Smlaier 4472126258Smlaier /* 4473126258Smlaier * May need to slide the window (seqhi may have been set by 4474126258Smlaier * the crappy stack check or if we picked up the connection 4475126258Smlaier * after establishment) 4476126258Smlaier */ 4477126258Smlaier if (src->seqhi == 1 || 4478126258Smlaier SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4479126258Smlaier src->seqhi = end + MAX(1, dst->max_win << dws); 4480126258Smlaier if (win > src->max_win) 4481126258Smlaier src->max_win = win; 4482126258Smlaier 4483126258Smlaier } else { 4484126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4485126258Smlaier if (src->seqdiff) { 4486126258Smlaier /* Modulate sequence numbers */ 4487126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4488126258Smlaier src->seqdiff), 0); 4489126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4490126258Smlaier copyback = 1; 4491126258Smlaier } 4492126258Smlaier end = seq + pd->p_len; 4493126258Smlaier if (th->th_flags & TH_SYN) 4494126258Smlaier end++; 4495126258Smlaier if (th->th_flags & TH_FIN) 4496126258Smlaier end++; 4497126258Smlaier } 4498126258Smlaier 4499126258Smlaier if ((th->th_flags & TH_ACK) == 0) { 4500126258Smlaier /* Let it pass through the ack skew check */ 4501126258Smlaier ack = dst->seqlo; 4502126258Smlaier } else if ((ack == 0 && 4503126258Smlaier (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4504126258Smlaier /* broken tcp stacks do not set ack */ 4505126258Smlaier (dst->state < TCPS_SYN_SENT)) { 4506126258Smlaier /* 4507126258Smlaier * Many stacks (ours included) will set the ACK number in an 4508126258Smlaier * FIN|ACK if the SYN times out -- no sequence to ACK. 4509126258Smlaier */ 4510126258Smlaier ack = dst->seqlo; 4511126258Smlaier } 4512126258Smlaier 4513126258Smlaier if (seq == end) { 4514126258Smlaier /* Ease sequencing restrictions on no data packets */ 4515126258Smlaier seq = src->seqlo; 4516126258Smlaier end = seq; 4517126258Smlaier } 4518126258Smlaier 4519126258Smlaier ackskew = dst->seqlo - ack; 4520126258Smlaier 4521126258Smlaier#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4522126258Smlaier if (SEQ_GEQ(src->seqhi, end) && 4523126258Smlaier /* Last octet inside other's window space */ 4524126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4525126258Smlaier /* Retrans: not more than one window back */ 4526126258Smlaier (ackskew >= -MAXACKWINDOW) && 4527126258Smlaier /* Acking not more than one reassembled fragment backwards */ 4528145836Smlaier (ackskew <= (MAXACKWINDOW << sws)) && 4529126258Smlaier /* Acking not more than one window forward */ 4530145836Smlaier ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4531145836Smlaier (pd->flags & PFDESC_IP_REAS) == 0)) { 4532145836Smlaier /* Require an exact sequence match on resets when possible */ 4533126258Smlaier 4534145836Smlaier if (dst->scrub || src->scrub) { 4535145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4536145836Smlaier *state, src, dst, ©back)) 4537145836Smlaier return (PF_DROP); 4538145836Smlaier } 4539145836Smlaier 4540126258Smlaier /* update max window */ 4541126258Smlaier if (src->max_win < win) 4542126258Smlaier src->max_win = win; 4543126258Smlaier /* synchronize sequencing */ 4544126258Smlaier if (SEQ_GT(end, src->seqlo)) 4545126258Smlaier src->seqlo = end; 4546126258Smlaier /* slide the window of what the other end can send */ 4547126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4548126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 4549126258Smlaier 4550126258Smlaier 4551126258Smlaier /* update states */ 4552126258Smlaier if (th->th_flags & TH_SYN) 4553126258Smlaier if (src->state < TCPS_SYN_SENT) 4554126258Smlaier src->state = TCPS_SYN_SENT; 4555126258Smlaier if (th->th_flags & TH_FIN) 4556126258Smlaier if (src->state < TCPS_CLOSING) 4557126258Smlaier src->state = TCPS_CLOSING; 4558126258Smlaier if (th->th_flags & TH_ACK) { 4559145836Smlaier if (dst->state == TCPS_SYN_SENT) { 4560126258Smlaier dst->state = TCPS_ESTABLISHED; 4561145836Smlaier if (src->state == TCPS_ESTABLISHED && 4562145836Smlaier (*state)->src_node != NULL && 4563145836Smlaier pf_src_connlimit(state)) { 4564145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4565145836Smlaier return (PF_DROP); 4566145836Smlaier } 4567145836Smlaier } else if (dst->state == TCPS_CLOSING) 4568126258Smlaier dst->state = TCPS_FIN_WAIT_2; 4569126258Smlaier } 4570126258Smlaier if (th->th_flags & TH_RST) 4571126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 4572126258Smlaier 4573126258Smlaier /* update expire time */ 4574126261Smlaier (*state)->expire = time_second; 4575126258Smlaier if (src->state >= TCPS_FIN_WAIT_2 && 4576126258Smlaier dst->state >= TCPS_FIN_WAIT_2) 4577126258Smlaier (*state)->timeout = PFTM_TCP_CLOSED; 4578126258Smlaier else if (src->state >= TCPS_FIN_WAIT_2 || 4579126258Smlaier dst->state >= TCPS_FIN_WAIT_2) 4580126258Smlaier (*state)->timeout = PFTM_TCP_FIN_WAIT; 4581126258Smlaier else if (src->state < TCPS_ESTABLISHED || 4582126258Smlaier dst->state < TCPS_ESTABLISHED) 4583126258Smlaier (*state)->timeout = PFTM_TCP_OPENING; 4584126258Smlaier else if (src->state >= TCPS_CLOSING || 4585126258Smlaier dst->state >= TCPS_CLOSING) 4586126258Smlaier (*state)->timeout = PFTM_TCP_CLOSING; 4587126258Smlaier else 4588126258Smlaier (*state)->timeout = PFTM_TCP_ESTABLISHED; 4589126258Smlaier 4590126258Smlaier /* Fall through to PASS packet */ 4591126258Smlaier 4592126258Smlaier } else if ((dst->state < TCPS_SYN_SENT || 4593126258Smlaier dst->state >= TCPS_FIN_WAIT_2 || 4594126258Smlaier src->state >= TCPS_FIN_WAIT_2) && 4595126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4596126258Smlaier /* Within a window forward of the originating packet */ 4597126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4598126258Smlaier /* Within a window backward of the originating packet */ 4599126258Smlaier 4600126258Smlaier /* 4601126258Smlaier * This currently handles three situations: 4602126258Smlaier * 1) Stupid stacks will shotgun SYNs before their peer 4603126258Smlaier * replies. 4604126258Smlaier * 2) When PF catches an already established stream (the 4605126258Smlaier * firewall rebooted, the state table was flushed, routes 4606126258Smlaier * changed...) 4607126258Smlaier * 3) Packets get funky immediately after the connection 4608126258Smlaier * closes (this should catch Solaris spurious ACK|FINs 4609126258Smlaier * that web servers like to spew after a close) 4610126258Smlaier * 4611126258Smlaier * This must be a little more careful than the above code 4612126258Smlaier * since packet floods will also be caught here. We don't 4613126258Smlaier * update the TTL here to mitigate the damage of a packet 4614126258Smlaier * flood and so the same code can handle awkward establishment 4615126258Smlaier * and a loosened connection close. 4616126258Smlaier * In the establishment case, a correct peer response will 4617126258Smlaier * validate the connection, go through the normal state code 4618126258Smlaier * and keep updating the state TTL. 4619126258Smlaier */ 4620126258Smlaier 4621126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 4622126258Smlaier printf("pf: loose state match: "); 4623126258Smlaier pf_print_state(*state); 4624126258Smlaier pf_print_flags(th->th_flags); 4625126258Smlaier printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n", 4626126258Smlaier seq, ack, pd->p_len, ackskew, 4627126258Smlaier (*state)->packets[0], (*state)->packets[1]); 4628126258Smlaier } 4629126258Smlaier 4630145836Smlaier if (dst->scrub || src->scrub) { 4631145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4632145836Smlaier *state, src, dst, ©back)) 4633145836Smlaier return (PF_DROP); 4634145836Smlaier } 4635145836Smlaier 4636126258Smlaier /* update max window */ 4637126258Smlaier if (src->max_win < win) 4638126258Smlaier src->max_win = win; 4639126258Smlaier /* synchronize sequencing */ 4640126258Smlaier if (SEQ_GT(end, src->seqlo)) 4641126258Smlaier src->seqlo = end; 4642126258Smlaier /* slide the window of what the other end can send */ 4643126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4644126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 4645126258Smlaier 4646126258Smlaier /* 4647126258Smlaier * Cannot set dst->seqhi here since this could be a shotgunned 4648126258Smlaier * SYN and not an already established connection. 4649126258Smlaier */ 4650126258Smlaier 4651126258Smlaier if (th->th_flags & TH_FIN) 4652126258Smlaier if (src->state < TCPS_CLOSING) 4653126258Smlaier src->state = TCPS_CLOSING; 4654126258Smlaier if (th->th_flags & TH_RST) 4655126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 4656126258Smlaier 4657126258Smlaier /* Fall through to PASS packet */ 4658126258Smlaier 4659126258Smlaier } else { 4660126258Smlaier if ((*state)->dst.state == TCPS_SYN_SENT && 4661126258Smlaier (*state)->src.state == TCPS_SYN_SENT) { 4662126258Smlaier /* Send RST for state mismatches during handshake */ 4663145836Smlaier if (!(th->th_flags & TH_RST)) 4664126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, 4665126258Smlaier pd->dst, pd->src, th->th_dport, 4666145836Smlaier th->th_sport, ntohl(th->th_ack), 0, 4667145836Smlaier TH_RST, 0, 0, 4668145836Smlaier (*state)->rule.ptr->return_ttl, 1, 4669145836Smlaier pd->eh, kif->pfik_ifp); 4670126258Smlaier src->seqlo = 0; 4671126258Smlaier src->seqhi = 1; 4672126258Smlaier src->max_win = 1; 4673126258Smlaier } else if (pf_status.debug >= PF_DEBUG_MISC) { 4674126258Smlaier printf("pf: BAD state: "); 4675126258Smlaier pf_print_state(*state); 4676126258Smlaier pf_print_flags(th->th_flags); 4677126258Smlaier printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d " 4678126258Smlaier "dir=%s,%s\n", seq, ack, pd->p_len, ackskew, 4679126258Smlaier (*state)->packets[0], (*state)->packets[1], 4680126258Smlaier direction == PF_IN ? "in" : "out", 4681126258Smlaier direction == (*state)->direction ? "fwd" : "rev"); 4682126258Smlaier printf("pf: State failure on: %c %c %c %c | %c %c\n", 4683126258Smlaier SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4684126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4685126258Smlaier ' ': '2', 4686126258Smlaier (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4687126258Smlaier (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4688126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4689126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4690126258Smlaier } 4691145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 4692126258Smlaier return (PF_DROP); 4693126258Smlaier } 4694126258Smlaier 4695126258Smlaier /* Any packets which have gotten here are to be passed */ 4696126258Smlaier 4697126258Smlaier /* translate source/destination address, if necessary */ 4698126258Smlaier if (STATE_TRANSLATE(*state)) { 4699126258Smlaier if (direction == PF_OUT) 4700126258Smlaier pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4701126258Smlaier &th->th_sum, &(*state)->gwy.addr, 4702126258Smlaier (*state)->gwy.port, 0, pd->af); 4703126258Smlaier else 4704126258Smlaier pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4705126258Smlaier &th->th_sum, &(*state)->lan.addr, 4706126258Smlaier (*state)->lan.port, 0, pd->af); 4707126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 4708126258Smlaier } else if (copyback) { 4709126258Smlaier /* Copyback sequence modulation or stateful scrub changes */ 4710126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 4711126258Smlaier } 4712126258Smlaier 4713126258Smlaier return (PF_PASS); 4714126258Smlaier} 4715126258Smlaier 4716126258Smlaierint 4717130613Smlaierpf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4718130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4719126258Smlaier{ 4720126258Smlaier struct pf_state_peer *src, *dst; 4721130613Smlaier struct pf_state key; 4722126258Smlaier struct udphdr *uh = pd->hdr.udp; 4723126258Smlaier 4724126258Smlaier key.af = pd->af; 4725126258Smlaier key.proto = IPPROTO_UDP; 4726130613Smlaier if (direction == PF_IN) { 4727130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 4728130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4729130613Smlaier key.ext.port = uh->uh_sport; 4730130613Smlaier key.gwy.port = uh->uh_dport; 4731130613Smlaier } else { 4732130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 4733130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 4734130613Smlaier key.lan.port = uh->uh_sport; 4735130613Smlaier key.ext.port = uh->uh_dport; 4736130613Smlaier } 4737126258Smlaier 4738126258Smlaier STATE_LOOKUP(); 4739126258Smlaier 4740126258Smlaier if (direction == (*state)->direction) { 4741126258Smlaier src = &(*state)->src; 4742126258Smlaier dst = &(*state)->dst; 4743126258Smlaier } else { 4744126258Smlaier src = &(*state)->dst; 4745126258Smlaier dst = &(*state)->src; 4746126258Smlaier } 4747126258Smlaier 4748126258Smlaier /* update states */ 4749126258Smlaier if (src->state < PFUDPS_SINGLE) 4750126258Smlaier src->state = PFUDPS_SINGLE; 4751126258Smlaier if (dst->state == PFUDPS_SINGLE) 4752126258Smlaier dst->state = PFUDPS_MULTIPLE; 4753126258Smlaier 4754126258Smlaier /* update expire time */ 4755126261Smlaier (*state)->expire = time_second; 4756126258Smlaier if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4757126258Smlaier (*state)->timeout = PFTM_UDP_MULTIPLE; 4758126258Smlaier else 4759126258Smlaier (*state)->timeout = PFTM_UDP_SINGLE; 4760126258Smlaier 4761126258Smlaier /* translate source/destination address, if necessary */ 4762126258Smlaier if (STATE_TRANSLATE(*state)) { 4763126258Smlaier if (direction == PF_OUT) 4764126258Smlaier pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4765126258Smlaier &uh->uh_sum, &(*state)->gwy.addr, 4766126258Smlaier (*state)->gwy.port, 1, pd->af); 4767126258Smlaier else 4768126258Smlaier pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4769126258Smlaier &uh->uh_sum, &(*state)->lan.addr, 4770126258Smlaier (*state)->lan.port, 1, pd->af); 4771126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4772126258Smlaier } 4773126258Smlaier 4774126258Smlaier return (PF_PASS); 4775126258Smlaier} 4776126258Smlaier 4777126258Smlaierint 4778130613Smlaierpf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4779145836Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4780126258Smlaier{ 4781126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4782127629Smlaier u_int16_t icmpid = 0; /* make the compiler happy */ 4783127629Smlaier u_int16_t *icmpsum = NULL; /* make the compiler happy */ 4784127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 4785130613Smlaier int state_icmp = 0; 4786126258Smlaier 4787126258Smlaier switch (pd->proto) { 4788126258Smlaier#ifdef INET 4789126258Smlaier case IPPROTO_ICMP: 4790126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 4791126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 4792126258Smlaier icmpsum = &pd->hdr.icmp->icmp_cksum; 4793126258Smlaier 4794126258Smlaier if (icmptype == ICMP_UNREACH || 4795126258Smlaier icmptype == ICMP_SOURCEQUENCH || 4796126258Smlaier icmptype == ICMP_REDIRECT || 4797126258Smlaier icmptype == ICMP_TIMXCEED || 4798126258Smlaier icmptype == ICMP_PARAMPROB) 4799126258Smlaier state_icmp++; 4800126258Smlaier break; 4801126258Smlaier#endif /* INET */ 4802126258Smlaier#ifdef INET6 4803126258Smlaier case IPPROTO_ICMPV6: 4804126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 4805126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 4806126258Smlaier icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4807126258Smlaier 4808126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 4809126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 4810126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 4811126258Smlaier icmptype == ICMP6_PARAM_PROB) 4812126258Smlaier state_icmp++; 4813126258Smlaier break; 4814126258Smlaier#endif /* INET6 */ 4815126258Smlaier } 4816126258Smlaier 4817126258Smlaier if (!state_icmp) { 4818126258Smlaier 4819126258Smlaier /* 4820126258Smlaier * ICMP query/reply message not related to a TCP/UDP packet. 4821126258Smlaier * Search for an ICMP state. 4822126258Smlaier */ 4823130613Smlaier struct pf_state key; 4824126258Smlaier 4825126258Smlaier key.af = pd->af; 4826126258Smlaier key.proto = pd->proto; 4827130613Smlaier if (direction == PF_IN) { 4828130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 4829130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4830149884Smlaier key.ext.port = 0; 4831130613Smlaier key.gwy.port = icmpid; 4832130613Smlaier } else { 4833130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 4834130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 4835130613Smlaier key.lan.port = icmpid; 4836149884Smlaier key.ext.port = 0; 4837130613Smlaier } 4838126258Smlaier 4839126258Smlaier STATE_LOOKUP(); 4840126258Smlaier 4841126261Smlaier (*state)->expire = time_second; 4842126258Smlaier (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4843126258Smlaier 4844126258Smlaier /* translate source/destination address, if necessary */ 4845149884Smlaier if (STATE_TRANSLATE(*state)) { 4846126258Smlaier if (direction == PF_OUT) { 4847126258Smlaier switch (pd->af) { 4848126258Smlaier#ifdef INET 4849126258Smlaier case AF_INET: 4850126258Smlaier pf_change_a(&saddr->v4.s_addr, 4851126258Smlaier pd->ip_sum, 4852126258Smlaier (*state)->gwy.addr.v4.s_addr, 0); 4853149884Smlaier pd->hdr.icmp->icmp_cksum = 4854149884Smlaier pf_cksum_fixup( 4855149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 4856149884Smlaier (*state)->gwy.port, 0); 4857149884Smlaier pd->hdr.icmp->icmp_id = 4858149884Smlaier (*state)->gwy.port; 4859149884Smlaier m_copyback(m, off, ICMP_MINLEN, 4860149884Smlaier pd->hdr.icmp); 4861126258Smlaier break; 4862126258Smlaier#endif /* INET */ 4863126258Smlaier#ifdef INET6 4864126258Smlaier case AF_INET6: 4865126258Smlaier pf_change_a6(saddr, 4866126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 4867126258Smlaier &(*state)->gwy.addr, 0); 4868126258Smlaier m_copyback(m, off, 4869126258Smlaier sizeof(struct icmp6_hdr), 4870126261Smlaier (caddr_t)pd->hdr.icmp6); 4871126258Smlaier break; 4872126258Smlaier#endif /* INET6 */ 4873126258Smlaier } 4874126258Smlaier } else { 4875126258Smlaier switch (pd->af) { 4876126258Smlaier#ifdef INET 4877126258Smlaier case AF_INET: 4878126258Smlaier pf_change_a(&daddr->v4.s_addr, 4879126258Smlaier pd->ip_sum, 4880126258Smlaier (*state)->lan.addr.v4.s_addr, 0); 4881149884Smlaier pd->hdr.icmp->icmp_cksum = 4882149884Smlaier pf_cksum_fixup( 4883149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 4884149884Smlaier (*state)->lan.port, 0); 4885149884Smlaier pd->hdr.icmp->icmp_id = 4886149884Smlaier (*state)->lan.port; 4887149884Smlaier m_copyback(m, off, ICMP_MINLEN, 4888149884Smlaier pd->hdr.icmp); 4889126258Smlaier break; 4890126258Smlaier#endif /* INET */ 4891126258Smlaier#ifdef INET6 4892126258Smlaier case AF_INET6: 4893126258Smlaier pf_change_a6(daddr, 4894126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 4895126258Smlaier &(*state)->lan.addr, 0); 4896126258Smlaier m_copyback(m, off, 4897126258Smlaier sizeof(struct icmp6_hdr), 4898126261Smlaier (caddr_t)pd->hdr.icmp6); 4899126258Smlaier break; 4900126258Smlaier#endif /* INET6 */ 4901126258Smlaier } 4902126258Smlaier } 4903126258Smlaier } 4904126258Smlaier 4905126258Smlaier return (PF_PASS); 4906126258Smlaier 4907126258Smlaier } else { 4908126258Smlaier /* 4909126258Smlaier * ICMP error message in response to a TCP/UDP packet. 4910126258Smlaier * Extract the inner TCP/UDP header and search for that state. 4911126258Smlaier */ 4912126258Smlaier 4913126258Smlaier struct pf_pdesc pd2; 4914126258Smlaier#ifdef INET 4915126258Smlaier struct ip h2; 4916126258Smlaier#endif /* INET */ 4917126258Smlaier#ifdef INET6 4918126258Smlaier struct ip6_hdr h2_6; 4919126258Smlaier int terminal = 0; 4920126258Smlaier#endif /* INET6 */ 4921127629Smlaier int ipoff2 = 0; /* make the compiler happy */ 4922127629Smlaier int off2 = 0; /* make the compiler happy */ 4923126258Smlaier 4924126258Smlaier pd2.af = pd->af; 4925126258Smlaier switch (pd->af) { 4926126258Smlaier#ifdef INET 4927126258Smlaier case AF_INET: 4928126258Smlaier /* offset of h2 in mbuf chain */ 4929126258Smlaier ipoff2 = off + ICMP_MINLEN; 4930126258Smlaier 4931126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4932145836Smlaier NULL, reason, pd2.af)) { 4933126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 4934126258Smlaier ("pf: ICMP error message too short " 4935126258Smlaier "(ip)\n")); 4936126258Smlaier return (PF_DROP); 4937126258Smlaier } 4938126258Smlaier /* 4939126258Smlaier * ICMP error messages don't refer to non-first 4940126258Smlaier * fragments 4941126258Smlaier */ 4942145836Smlaier if (h2.ip_off & htons(IP_OFFMASK)) { 4943145836Smlaier REASON_SET(reason, PFRES_FRAG); 4944126258Smlaier return (PF_DROP); 4945145836Smlaier } 4946126258Smlaier 4947126258Smlaier /* offset of protocol header that follows h2 */ 4948126258Smlaier off2 = ipoff2 + (h2.ip_hl << 2); 4949126258Smlaier 4950126258Smlaier pd2.proto = h2.ip_p; 4951126258Smlaier pd2.src = (struct pf_addr *)&h2.ip_src; 4952126258Smlaier pd2.dst = (struct pf_addr *)&h2.ip_dst; 4953126258Smlaier pd2.ip_sum = &h2.ip_sum; 4954126258Smlaier break; 4955126258Smlaier#endif /* INET */ 4956126258Smlaier#ifdef INET6 4957126258Smlaier case AF_INET6: 4958126258Smlaier ipoff2 = off + sizeof(struct icmp6_hdr); 4959126258Smlaier 4960126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4961145836Smlaier NULL, reason, pd2.af)) { 4962126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 4963126258Smlaier ("pf: ICMP error message too short " 4964126258Smlaier "(ip6)\n")); 4965126258Smlaier return (PF_DROP); 4966126258Smlaier } 4967126258Smlaier pd2.proto = h2_6.ip6_nxt; 4968126258Smlaier pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4969126258Smlaier pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4970126258Smlaier pd2.ip_sum = NULL; 4971126258Smlaier off2 = ipoff2 + sizeof(h2_6); 4972126258Smlaier do { 4973126258Smlaier switch (pd2.proto) { 4974126258Smlaier case IPPROTO_FRAGMENT: 4975126258Smlaier /* 4976126258Smlaier * ICMPv6 error messages for 4977126258Smlaier * non-first fragments 4978126258Smlaier */ 4979145836Smlaier REASON_SET(reason, PFRES_FRAG); 4980126258Smlaier return (PF_DROP); 4981126258Smlaier case IPPROTO_AH: 4982126258Smlaier case IPPROTO_HOPOPTS: 4983126258Smlaier case IPPROTO_ROUTING: 4984126258Smlaier case IPPROTO_DSTOPTS: { 4985126258Smlaier /* get next header and header length */ 4986126258Smlaier struct ip6_ext opt6; 4987126258Smlaier 4988126258Smlaier if (!pf_pull_hdr(m, off2, &opt6, 4989145836Smlaier sizeof(opt6), NULL, reason, 4990145836Smlaier pd2.af)) { 4991126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 4992126258Smlaier ("pf: ICMPv6 short opt\n")); 4993126258Smlaier return (PF_DROP); 4994126258Smlaier } 4995126258Smlaier if (pd2.proto == IPPROTO_AH) 4996126258Smlaier off2 += (opt6.ip6e_len + 2) * 4; 4997126258Smlaier else 4998126258Smlaier off2 += (opt6.ip6e_len + 1) * 8; 4999126258Smlaier pd2.proto = opt6.ip6e_nxt; 5000126258Smlaier /* goto the next header */ 5001126258Smlaier break; 5002126258Smlaier } 5003126258Smlaier default: 5004126258Smlaier terminal++; 5005126258Smlaier break; 5006126258Smlaier } 5007126258Smlaier } while (!terminal); 5008126258Smlaier break; 5009126258Smlaier#endif /* INET6 */ 5010126258Smlaier } 5011126258Smlaier 5012126258Smlaier switch (pd2.proto) { 5013126258Smlaier case IPPROTO_TCP: { 5014126258Smlaier struct tcphdr th; 5015126258Smlaier u_int32_t seq; 5016130613Smlaier struct pf_state key; 5017126258Smlaier struct pf_state_peer *src, *dst; 5018126258Smlaier u_int8_t dws; 5019128129Smlaier int copyback = 0; 5020126258Smlaier 5021126258Smlaier /* 5022126258Smlaier * Only the first 8 bytes of the TCP header can be 5023126258Smlaier * expected. Don't access any TCP header fields after 5024126258Smlaier * th_seq, an ackskew test is not possible. 5025126258Smlaier */ 5026145836Smlaier if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5027145836Smlaier pd2.af)) { 5028126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5029126258Smlaier ("pf: ICMP error message too short " 5030126258Smlaier "(tcp)\n")); 5031126258Smlaier return (PF_DROP); 5032126258Smlaier } 5033126258Smlaier 5034126258Smlaier key.af = pd2.af; 5035126258Smlaier key.proto = IPPROTO_TCP; 5036130613Smlaier if (direction == PF_IN) { 5037130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5038130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5039130613Smlaier key.ext.port = th.th_dport; 5040130613Smlaier key.gwy.port = th.th_sport; 5041130613Smlaier } else { 5042130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5043130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5044130613Smlaier key.lan.port = th.th_dport; 5045130613Smlaier key.ext.port = th.th_sport; 5046130613Smlaier } 5047126258Smlaier 5048126258Smlaier STATE_LOOKUP(); 5049126258Smlaier 5050126258Smlaier if (direction == (*state)->direction) { 5051126258Smlaier src = &(*state)->dst; 5052126258Smlaier dst = &(*state)->src; 5053126258Smlaier } else { 5054126258Smlaier src = &(*state)->src; 5055126258Smlaier dst = &(*state)->dst; 5056126258Smlaier } 5057126258Smlaier 5058130613Smlaier if (src->wscale && dst->wscale && 5059130613Smlaier !(th.th_flags & TH_SYN)) 5060126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 5061126258Smlaier else 5062126258Smlaier dws = 0; 5063126258Smlaier 5064126258Smlaier /* Demodulate sequence number */ 5065126258Smlaier seq = ntohl(th.th_seq) - src->seqdiff; 5066128129Smlaier if (src->seqdiff) { 5067128129Smlaier pf_change_a(&th.th_seq, icmpsum, 5068126258Smlaier htonl(seq), 0); 5069128129Smlaier copyback = 1; 5070128129Smlaier } 5071126258Smlaier 5072126258Smlaier if (!SEQ_GEQ(src->seqhi, seq) || 5073126258Smlaier !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 5074126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 5075126258Smlaier printf("pf: BAD ICMP %d:%d ", 5076126258Smlaier icmptype, pd->hdr.icmp->icmp_code); 5077126258Smlaier pf_print_host(pd->src, 0, pd->af); 5078126258Smlaier printf(" -> "); 5079126258Smlaier pf_print_host(pd->dst, 0, pd->af); 5080126258Smlaier printf(" state: "); 5081126258Smlaier pf_print_state(*state); 5082126258Smlaier printf(" seq=%u\n", seq); 5083126258Smlaier } 5084145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 5085126258Smlaier return (PF_DROP); 5086126258Smlaier } 5087126258Smlaier 5088126258Smlaier if (STATE_TRANSLATE(*state)) { 5089126258Smlaier if (direction == PF_IN) { 5090126258Smlaier pf_change_icmp(pd2.src, &th.th_sport, 5091128129Smlaier daddr, &(*state)->lan.addr, 5092126258Smlaier (*state)->lan.port, NULL, 5093126258Smlaier pd2.ip_sum, icmpsum, 5094126258Smlaier pd->ip_sum, 0, pd2.af); 5095126258Smlaier } else { 5096126258Smlaier pf_change_icmp(pd2.dst, &th.th_dport, 5097126258Smlaier saddr, &(*state)->gwy.addr, 5098126258Smlaier (*state)->gwy.port, NULL, 5099126258Smlaier pd2.ip_sum, icmpsum, 5100126258Smlaier pd->ip_sum, 0, pd2.af); 5101126258Smlaier } 5102128129Smlaier copyback = 1; 5103128129Smlaier } 5104128129Smlaier 5105128129Smlaier if (copyback) { 5106126258Smlaier switch (pd2.af) { 5107126258Smlaier#ifdef INET 5108126258Smlaier case AF_INET: 5109126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5110126261Smlaier (caddr_t)pd->hdr.icmp); 5111126258Smlaier m_copyback(m, ipoff2, sizeof(h2), 5112126261Smlaier (caddr_t)&h2); 5113126258Smlaier break; 5114126258Smlaier#endif /* INET */ 5115126258Smlaier#ifdef INET6 5116126258Smlaier case AF_INET6: 5117126258Smlaier m_copyback(m, off, 5118126258Smlaier sizeof(struct icmp6_hdr), 5119126261Smlaier (caddr_t)pd->hdr.icmp6); 5120126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5121126261Smlaier (caddr_t)&h2_6); 5122126258Smlaier break; 5123126258Smlaier#endif /* INET6 */ 5124126258Smlaier } 5125126261Smlaier m_copyback(m, off2, 8, (caddr_t)&th); 5126126258Smlaier } 5127126258Smlaier 5128126258Smlaier return (PF_PASS); 5129126258Smlaier break; 5130126258Smlaier } 5131126258Smlaier case IPPROTO_UDP: { 5132126258Smlaier struct udphdr uh; 5133130613Smlaier struct pf_state key; 5134126258Smlaier 5135126258Smlaier if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5136145836Smlaier NULL, reason, pd2.af)) { 5137126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5138126258Smlaier ("pf: ICMP error message too short " 5139126258Smlaier "(udp)\n")); 5140126258Smlaier return (PF_DROP); 5141126258Smlaier } 5142126258Smlaier 5143126258Smlaier key.af = pd2.af; 5144126258Smlaier key.proto = IPPROTO_UDP; 5145130613Smlaier if (direction == PF_IN) { 5146130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5147130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5148130613Smlaier key.ext.port = uh.uh_dport; 5149130613Smlaier key.gwy.port = uh.uh_sport; 5150130613Smlaier } else { 5151130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5152130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5153130613Smlaier key.lan.port = uh.uh_dport; 5154130613Smlaier key.ext.port = uh.uh_sport; 5155130613Smlaier } 5156126258Smlaier 5157126258Smlaier STATE_LOOKUP(); 5158126258Smlaier 5159126258Smlaier if (STATE_TRANSLATE(*state)) { 5160126258Smlaier if (direction == PF_IN) { 5161126258Smlaier pf_change_icmp(pd2.src, &uh.uh_sport, 5162126258Smlaier daddr, &(*state)->lan.addr, 5163126258Smlaier (*state)->lan.port, &uh.uh_sum, 5164126258Smlaier pd2.ip_sum, icmpsum, 5165126258Smlaier pd->ip_sum, 1, pd2.af); 5166126258Smlaier } else { 5167126258Smlaier pf_change_icmp(pd2.dst, &uh.uh_dport, 5168126258Smlaier saddr, &(*state)->gwy.addr, 5169126258Smlaier (*state)->gwy.port, &uh.uh_sum, 5170126258Smlaier pd2.ip_sum, icmpsum, 5171126258Smlaier pd->ip_sum, 1, pd2.af); 5172126258Smlaier } 5173126258Smlaier switch (pd2.af) { 5174126258Smlaier#ifdef INET 5175126258Smlaier case AF_INET: 5176126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5177126261Smlaier (caddr_t)pd->hdr.icmp); 5178126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5179126261Smlaier (caddr_t)&h2); 5180126258Smlaier break; 5181126258Smlaier#endif /* INET */ 5182126258Smlaier#ifdef INET6 5183126258Smlaier case AF_INET6: 5184126258Smlaier m_copyback(m, off, 5185126258Smlaier sizeof(struct icmp6_hdr), 5186126261Smlaier (caddr_t)pd->hdr.icmp6); 5187126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5188126261Smlaier (caddr_t)&h2_6); 5189126258Smlaier break; 5190126258Smlaier#endif /* INET6 */ 5191126258Smlaier } 5192126261Smlaier m_copyback(m, off2, sizeof(uh), 5193126261Smlaier (caddr_t)&uh); 5194126258Smlaier } 5195126258Smlaier 5196126258Smlaier return (PF_PASS); 5197126258Smlaier break; 5198126258Smlaier } 5199126258Smlaier#ifdef INET 5200126258Smlaier case IPPROTO_ICMP: { 5201126258Smlaier struct icmp iih; 5202130613Smlaier struct pf_state key; 5203126258Smlaier 5204126258Smlaier if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5205145836Smlaier NULL, reason, pd2.af)) { 5206126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5207126258Smlaier ("pf: ICMP error message too short i" 5208126258Smlaier "(icmp)\n")); 5209126258Smlaier return (PF_DROP); 5210126258Smlaier } 5211126258Smlaier 5212126258Smlaier key.af = pd2.af; 5213126258Smlaier key.proto = IPPROTO_ICMP; 5214130613Smlaier if (direction == PF_IN) { 5215130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5216130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5217149884Smlaier key.ext.port = 0; 5218130613Smlaier key.gwy.port = iih.icmp_id; 5219130613Smlaier } else { 5220130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5221130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5222130613Smlaier key.lan.port = iih.icmp_id; 5223149884Smlaier key.ext.port = 0; 5224130613Smlaier } 5225126258Smlaier 5226126258Smlaier STATE_LOOKUP(); 5227126258Smlaier 5228126258Smlaier if (STATE_TRANSLATE(*state)) { 5229126258Smlaier if (direction == PF_IN) { 5230126258Smlaier pf_change_icmp(pd2.src, &iih.icmp_id, 5231126258Smlaier daddr, &(*state)->lan.addr, 5232126258Smlaier (*state)->lan.port, NULL, 5233126258Smlaier pd2.ip_sum, icmpsum, 5234126258Smlaier pd->ip_sum, 0, AF_INET); 5235126258Smlaier } else { 5236126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp_id, 5237126258Smlaier saddr, &(*state)->gwy.addr, 5238126258Smlaier (*state)->gwy.port, NULL, 5239126258Smlaier pd2.ip_sum, icmpsum, 5240126258Smlaier pd->ip_sum, 0, AF_INET); 5241126258Smlaier } 5242126261Smlaier m_copyback(m, off, ICMP_MINLEN, 5243126261Smlaier (caddr_t)pd->hdr.icmp); 5244126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5245126261Smlaier (caddr_t)&h2); 5246126261Smlaier m_copyback(m, off2, ICMP_MINLEN, 5247126261Smlaier (caddr_t)&iih); 5248126258Smlaier } 5249126258Smlaier 5250126258Smlaier return (PF_PASS); 5251126258Smlaier break; 5252126258Smlaier } 5253126258Smlaier#endif /* INET */ 5254126258Smlaier#ifdef INET6 5255126258Smlaier case IPPROTO_ICMPV6: { 5256126258Smlaier struct icmp6_hdr iih; 5257130613Smlaier struct pf_state key; 5258126258Smlaier 5259126258Smlaier if (!pf_pull_hdr(m, off2, &iih, 5260145836Smlaier sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5261126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5262126258Smlaier ("pf: ICMP error message too short " 5263126258Smlaier "(icmp6)\n")); 5264126258Smlaier return (PF_DROP); 5265126258Smlaier } 5266126258Smlaier 5267126258Smlaier key.af = pd2.af; 5268126258Smlaier key.proto = IPPROTO_ICMPV6; 5269130613Smlaier if (direction == PF_IN) { 5270130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5271130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5272149884Smlaier key.ext.port = 0; 5273130613Smlaier key.gwy.port = iih.icmp6_id; 5274130613Smlaier } else { 5275130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5276130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5277130613Smlaier key.lan.port = iih.icmp6_id; 5278149884Smlaier key.ext.port = 0; 5279130613Smlaier } 5280126258Smlaier 5281126258Smlaier STATE_LOOKUP(); 5282126258Smlaier 5283126258Smlaier if (STATE_TRANSLATE(*state)) { 5284126258Smlaier if (direction == PF_IN) { 5285126258Smlaier pf_change_icmp(pd2.src, &iih.icmp6_id, 5286126258Smlaier daddr, &(*state)->lan.addr, 5287126258Smlaier (*state)->lan.port, NULL, 5288126258Smlaier pd2.ip_sum, icmpsum, 5289126258Smlaier pd->ip_sum, 0, AF_INET6); 5290126258Smlaier } else { 5291126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp6_id, 5292126258Smlaier saddr, &(*state)->gwy.addr, 5293126258Smlaier (*state)->gwy.port, NULL, 5294126258Smlaier pd2.ip_sum, icmpsum, 5295126258Smlaier pd->ip_sum, 0, AF_INET6); 5296126258Smlaier } 5297126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 5298126261Smlaier (caddr_t)pd->hdr.icmp6); 5299126261Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5300126261Smlaier (caddr_t)&h2_6); 5301126258Smlaier m_copyback(m, off2, sizeof(struct icmp6_hdr), 5302126261Smlaier (caddr_t)&iih); 5303126258Smlaier } 5304126258Smlaier 5305126258Smlaier return (PF_PASS); 5306126258Smlaier break; 5307126258Smlaier } 5308126258Smlaier#endif /* INET6 */ 5309126258Smlaier default: { 5310130613Smlaier struct pf_state key; 5311126258Smlaier 5312126258Smlaier key.af = pd2.af; 5313126258Smlaier key.proto = pd2.proto; 5314130613Smlaier if (direction == PF_IN) { 5315130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5316130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5317130613Smlaier key.ext.port = 0; 5318130613Smlaier key.gwy.port = 0; 5319130613Smlaier } else { 5320130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5321130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5322130613Smlaier key.lan.port = 0; 5323130613Smlaier key.ext.port = 0; 5324130613Smlaier } 5325126258Smlaier 5326126258Smlaier STATE_LOOKUP(); 5327126258Smlaier 5328126258Smlaier if (STATE_TRANSLATE(*state)) { 5329126258Smlaier if (direction == PF_IN) { 5330126258Smlaier pf_change_icmp(pd2.src, NULL, 5331126258Smlaier daddr, &(*state)->lan.addr, 5332126258Smlaier 0, NULL, 5333126258Smlaier pd2.ip_sum, icmpsum, 5334126258Smlaier pd->ip_sum, 0, pd2.af); 5335126258Smlaier } else { 5336126258Smlaier pf_change_icmp(pd2.dst, NULL, 5337126258Smlaier saddr, &(*state)->gwy.addr, 5338126258Smlaier 0, NULL, 5339126258Smlaier pd2.ip_sum, icmpsum, 5340126258Smlaier pd->ip_sum, 0, pd2.af); 5341126258Smlaier } 5342126258Smlaier switch (pd2.af) { 5343126258Smlaier#ifdef INET 5344126258Smlaier case AF_INET: 5345126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5346126261Smlaier (caddr_t)pd->hdr.icmp); 5347126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5348126261Smlaier (caddr_t)&h2); 5349126258Smlaier break; 5350126258Smlaier#endif /* INET */ 5351126258Smlaier#ifdef INET6 5352126258Smlaier case AF_INET6: 5353126258Smlaier m_copyback(m, off, 5354126258Smlaier sizeof(struct icmp6_hdr), 5355126261Smlaier (caddr_t)pd->hdr.icmp6); 5356126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5357126261Smlaier (caddr_t)&h2_6); 5358126258Smlaier break; 5359126258Smlaier#endif /* INET6 */ 5360126258Smlaier } 5361126258Smlaier } 5362126258Smlaier 5363126258Smlaier return (PF_PASS); 5364126258Smlaier break; 5365126258Smlaier } 5366126258Smlaier } 5367126258Smlaier } 5368126258Smlaier} 5369126258Smlaier 5370126258Smlaierint 5371130613Smlaierpf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5372126258Smlaier struct pf_pdesc *pd) 5373126258Smlaier{ 5374126258Smlaier struct pf_state_peer *src, *dst; 5375130613Smlaier struct pf_state key; 5376126258Smlaier 5377126258Smlaier key.af = pd->af; 5378126258Smlaier key.proto = pd->proto; 5379130613Smlaier if (direction == PF_IN) { 5380130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5381130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5382130613Smlaier key.ext.port = 0; 5383130613Smlaier key.gwy.port = 0; 5384130613Smlaier } else { 5385130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5386130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5387130613Smlaier key.lan.port = 0; 5388130613Smlaier key.ext.port = 0; 5389130613Smlaier } 5390126258Smlaier 5391126258Smlaier STATE_LOOKUP(); 5392126258Smlaier 5393126258Smlaier if (direction == (*state)->direction) { 5394126258Smlaier src = &(*state)->src; 5395126258Smlaier dst = &(*state)->dst; 5396126258Smlaier } else { 5397126258Smlaier src = &(*state)->dst; 5398126258Smlaier dst = &(*state)->src; 5399126258Smlaier } 5400126258Smlaier 5401126258Smlaier /* update states */ 5402126258Smlaier if (src->state < PFOTHERS_SINGLE) 5403126258Smlaier src->state = PFOTHERS_SINGLE; 5404126258Smlaier if (dst->state == PFOTHERS_SINGLE) 5405126258Smlaier dst->state = PFOTHERS_MULTIPLE; 5406126258Smlaier 5407126258Smlaier /* update expire time */ 5408126261Smlaier (*state)->expire = time_second; 5409126258Smlaier if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5410126258Smlaier (*state)->timeout = PFTM_OTHER_MULTIPLE; 5411126258Smlaier else 5412126258Smlaier (*state)->timeout = PFTM_OTHER_SINGLE; 5413126258Smlaier 5414126258Smlaier /* translate source/destination address, if necessary */ 5415126258Smlaier if (STATE_TRANSLATE(*state)) { 5416126258Smlaier if (direction == PF_OUT) 5417126258Smlaier switch (pd->af) { 5418126258Smlaier#ifdef INET 5419126258Smlaier case AF_INET: 5420126258Smlaier pf_change_a(&pd->src->v4.s_addr, 5421126258Smlaier pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5422126258Smlaier 0); 5423126258Smlaier break; 5424126258Smlaier#endif /* INET */ 5425126258Smlaier#ifdef INET6 5426126258Smlaier case AF_INET6: 5427126258Smlaier PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 5428126258Smlaier break; 5429126258Smlaier#endif /* INET6 */ 5430126258Smlaier } 5431126258Smlaier else 5432126258Smlaier switch (pd->af) { 5433126258Smlaier#ifdef INET 5434126258Smlaier case AF_INET: 5435126258Smlaier pf_change_a(&pd->dst->v4.s_addr, 5436126258Smlaier pd->ip_sum, (*state)->lan.addr.v4.s_addr, 5437126258Smlaier 0); 5438126258Smlaier break; 5439126258Smlaier#endif /* INET */ 5440126258Smlaier#ifdef INET6 5441126258Smlaier case AF_INET6: 5442126258Smlaier PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 5443126258Smlaier break; 5444126258Smlaier#endif /* INET6 */ 5445126258Smlaier } 5446126258Smlaier } 5447126258Smlaier 5448126258Smlaier return (PF_PASS); 5449126258Smlaier} 5450126258Smlaier 5451126258Smlaier/* 5452126258Smlaier * ipoff and off are measured from the start of the mbuf chain. 5453126258Smlaier * h must be at "ipoff" on the mbuf chain. 5454126258Smlaier */ 5455126258Smlaiervoid * 5456126258Smlaierpf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5457126258Smlaier u_short *actionp, u_short *reasonp, sa_family_t af) 5458126258Smlaier{ 5459126258Smlaier switch (af) { 5460126258Smlaier#ifdef INET 5461126258Smlaier case AF_INET: { 5462126258Smlaier struct ip *h = mtod(m, struct ip *); 5463126258Smlaier u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5464126258Smlaier 5465126258Smlaier if (fragoff) { 5466126258Smlaier if (fragoff >= len) 5467126258Smlaier ACTION_SET(actionp, PF_PASS); 5468126258Smlaier else { 5469126258Smlaier ACTION_SET(actionp, PF_DROP); 5470126258Smlaier REASON_SET(reasonp, PFRES_FRAG); 5471126258Smlaier } 5472126258Smlaier return (NULL); 5473126258Smlaier } 5474130613Smlaier if (m->m_pkthdr.len < off + len || 5475130613Smlaier ntohs(h->ip_len) < off + len) { 5476126258Smlaier ACTION_SET(actionp, PF_DROP); 5477126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5478126258Smlaier return (NULL); 5479126258Smlaier } 5480126258Smlaier break; 5481126258Smlaier } 5482126258Smlaier#endif /* INET */ 5483126258Smlaier#ifdef INET6 5484126258Smlaier case AF_INET6: { 5485126258Smlaier struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5486126258Smlaier 5487126258Smlaier if (m->m_pkthdr.len < off + len || 5488126258Smlaier (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5489126258Smlaier (unsigned)(off + len)) { 5490126258Smlaier ACTION_SET(actionp, PF_DROP); 5491126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5492126258Smlaier return (NULL); 5493126258Smlaier } 5494126258Smlaier break; 5495126258Smlaier } 5496126258Smlaier#endif /* INET6 */ 5497126258Smlaier } 5498126258Smlaier m_copydata(m, off, len, p); 5499126258Smlaier return (p); 5500126258Smlaier} 5501126258Smlaier 5502126258Smlaierint 5503126258Smlaierpf_routable(struct pf_addr *addr, sa_family_t af) 5504126258Smlaier{ 5505126258Smlaier struct sockaddr_in *dst; 5506145836Smlaier#ifdef INET6 5507145836Smlaier struct sockaddr_in6 *dst6; 5508145836Smlaier struct route_in6 ro; 5509145836Smlaier#else 5510126258Smlaier struct route ro; 5511145836Smlaier#endif 5512126258Smlaier 5513126258Smlaier bzero(&ro, sizeof(ro)); 5514145836Smlaier switch (af) { 5515145836Smlaier case AF_INET: 5516145836Smlaier dst = satosin(&ro.ro_dst); 5517145836Smlaier dst->sin_family = AF_INET; 5518145836Smlaier dst->sin_len = sizeof(*dst); 5519145836Smlaier dst->sin_addr = addr->v4; 5520145836Smlaier break; 5521145836Smlaier#ifdef INET6 5522145836Smlaier case AF_INET6: 5523145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5524145836Smlaier dst6->sin6_family = AF_INET6; 5525145836Smlaier dst6->sin6_len = sizeof(*dst6); 5526145836Smlaier dst6->sin6_addr = addr->v6; 5527145836Smlaier break; 5528145836Smlaier#endif /* INET6 */ 5529145836Smlaier default: 5530145836Smlaier return (0); 5531145836Smlaier } 5532145836Smlaier 5533127145Smlaier#ifdef __FreeBSD__ 5534126261Smlaier#ifdef RTF_PRCLONING 5535145836Smlaier rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5536126261Smlaier#else /* !RTF_PRCLONING */ 5537145836Smlaier rtalloc_ign((struct route *)&ro, RTF_CLONING); 5538126261Smlaier#endif 5539126261Smlaier#else /* ! __FreeBSD__ */ 5540145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 5541126261Smlaier#endif 5542126258Smlaier 5543126258Smlaier if (ro.ro_rt != NULL) { 5544126258Smlaier RTFREE(ro.ro_rt); 5545145836Smlaier return (1); 5546126258Smlaier } 5547126258Smlaier 5548145836Smlaier return (0); 5549145836Smlaier} 5550145836Smlaier 5551145836Smlaierint 5552145836Smlaierpf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5553145836Smlaier{ 5554145836Smlaier struct sockaddr_in *dst; 5555145836Smlaier#ifdef INET6 5556145836Smlaier struct sockaddr_in6 *dst6; 5557145836Smlaier struct route_in6 ro; 5558145836Smlaier#else 5559145836Smlaier struct route ro; 5560145836Smlaier#endif 5561145836Smlaier int ret = 0; 5562145836Smlaier 5563145836Smlaier bzero(&ro, sizeof(ro)); 5564145836Smlaier switch (af) { 5565145836Smlaier case AF_INET: 5566145836Smlaier dst = satosin(&ro.ro_dst); 5567145836Smlaier dst->sin_family = AF_INET; 5568145836Smlaier dst->sin_len = sizeof(*dst); 5569145836Smlaier dst->sin_addr = addr->v4; 5570145836Smlaier break; 5571145836Smlaier#ifdef INET6 5572145836Smlaier case AF_INET6: 5573145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5574145836Smlaier dst6->sin6_family = AF_INET6; 5575145836Smlaier dst6->sin6_len = sizeof(*dst6); 5576145836Smlaier dst6->sin6_addr = addr->v6; 5577145836Smlaier break; 5578145836Smlaier#endif /* INET6 */ 5579145836Smlaier default: 5580145836Smlaier return (0); 5581145836Smlaier } 5582145836Smlaier 5583145836Smlaier#ifdef __FreeBSD__ 5584145836Smlaier# ifdef RTF_PRCLONING 5585145836Smlaier rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 5586145836Smlaier# else /* !RTF_PRCLONING */ 5587145836Smlaier rtalloc_ign((struct route *)&ro, RTF_CLONING); 5588145836Smlaier# endif 5589145836Smlaier#else /* ! __FreeBSD__ */ 5590145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 5591145836Smlaier#endif 5592145836Smlaier 5593145836Smlaier if (ro.ro_rt != NULL) { 5594145836Smlaier#ifdef __FreeBSD__ 5595145836Smlaier /* XXX_IMPORT: later */ 5596145836Smlaier#else 5597145836Smlaier if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 5598145836Smlaier ret = 1; 5599145836Smlaier#endif 5600145836Smlaier RTFREE(ro.ro_rt); 5601145836Smlaier } 5602145836Smlaier 5603126258Smlaier return (ret); 5604126258Smlaier} 5605126258Smlaier 5606126258Smlaier#ifdef INET 5607126261Smlaier 5608126258Smlaiervoid 5609126258Smlaierpf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5610126258Smlaier struct pf_state *s) 5611126258Smlaier{ 5612126258Smlaier struct mbuf *m0, *m1; 5613132303Smlaier struct m_tag *mtag; 5614126258Smlaier struct route iproute; 5615127629Smlaier struct route *ro = NULL; /* XXX: was uninitialized */ 5616126258Smlaier struct sockaddr_in *dst; 5617126258Smlaier struct ip *ip; 5618126258Smlaier struct ifnet *ifp = NULL; 5619126258Smlaier struct pf_addr naddr; 5620130613Smlaier struct pf_src_node *sn = NULL; 5621126258Smlaier int error = 0; 5622127145Smlaier#ifdef __FreeBSD__ 5623126261Smlaier int sw_csum; 5624126261Smlaier#endif 5625126258Smlaier 5626126258Smlaier if (m == NULL || *m == NULL || r == NULL || 5627126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5628126258Smlaier panic("pf_route: invalid parameters"); 5629126258Smlaier 5630132303Smlaier if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) { 5631132303Smlaier if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) == 5632132303Smlaier NULL) { 5633132303Smlaier m0 = *m; 5634132303Smlaier *m = NULL; 5635132303Smlaier goto bad; 5636132303Smlaier } 5637132303Smlaier *(char *)(mtag + 1) = 1; 5638132303Smlaier m_tag_prepend(*m, mtag); 5639132303Smlaier } else { 5640132303Smlaier if (*(char *)(mtag + 1) > 3) { 5641132303Smlaier m0 = *m; 5642132303Smlaier *m = NULL; 5643132303Smlaier goto bad; 5644132303Smlaier } 5645132303Smlaier (*(char *)(mtag + 1))++; 5646132303Smlaier } 5647132303Smlaier 5648126258Smlaier if (r->rt == PF_DUPTO) { 5649127145Smlaier#ifdef __FreeBSD__ 5650132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 5651126261Smlaier#else 5652132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5653126261Smlaier#endif 5654126258Smlaier return; 5655126258Smlaier } else { 5656126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5657126258Smlaier return; 5658126258Smlaier m0 = *m; 5659126258Smlaier } 5660126258Smlaier 5661145836Smlaier if (m0->m_len < sizeof(struct ip)) { 5662145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 5663145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5664145836Smlaier goto bad; 5665145836Smlaier } 5666145836Smlaier 5667126258Smlaier ip = mtod(m0, struct ip *); 5668126258Smlaier 5669126258Smlaier ro = &iproute; 5670126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 5671126258Smlaier dst = satosin(&ro->ro_dst); 5672126258Smlaier dst->sin_family = AF_INET; 5673126258Smlaier dst->sin_len = sizeof(*dst); 5674126258Smlaier dst->sin_addr = ip->ip_dst; 5675126258Smlaier 5676126258Smlaier if (r->rt == PF_FASTROUTE) { 5677126258Smlaier rtalloc(ro); 5678126258Smlaier if (ro->ro_rt == 0) { 5679126258Smlaier ipstat.ips_noroute++; 5680126258Smlaier goto bad; 5681126258Smlaier } 5682126258Smlaier 5683126258Smlaier ifp = ro->ro_rt->rt_ifp; 5684126258Smlaier ro->ro_rt->rt_use++; 5685126258Smlaier 5686126258Smlaier if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5687126258Smlaier dst = satosin(ro->ro_rt->rt_gateway); 5688126258Smlaier } else { 5689145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 5690145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 5691145836Smlaier ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5692145836Smlaier goto bad; 5693145836Smlaier } 5694126258Smlaier if (s == NULL) { 5695130613Smlaier pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5696130613Smlaier &naddr, NULL, &sn); 5697126258Smlaier if (!PF_AZERO(&naddr, AF_INET)) 5698126258Smlaier dst->sin_addr.s_addr = naddr.v4.s_addr; 5699130613Smlaier ifp = r->rpool.cur->kif ? 5700130613Smlaier r->rpool.cur->kif->pfik_ifp : NULL; 5701126258Smlaier } else { 5702126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET)) 5703126258Smlaier dst->sin_addr.s_addr = 5704126258Smlaier s->rt_addr.v4.s_addr; 5705130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5706126258Smlaier } 5707126258Smlaier } 5708126258Smlaier if (ifp == NULL) 5709126258Smlaier goto bad; 5710126258Smlaier 5711130639Smlaier if (oifp != ifp) { 5712127145Smlaier#ifdef __FreeBSD__ 5713126261Smlaier PF_UNLOCK(); 5714145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5715126261Smlaier PF_LOCK(); 5716126261Smlaier goto bad; 5717126261Smlaier } else if (m0 == NULL) { 5718126261Smlaier PF_LOCK(); 5719126261Smlaier goto done; 5720126261Smlaier } 5721126261Smlaier PF_LOCK(); 5722126261Smlaier#else 5723145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5724126258Smlaier goto bad; 5725126258Smlaier else if (m0 == NULL) 5726126258Smlaier goto done; 5727126261Smlaier#endif 5728145836Smlaier if (m0->m_len < sizeof(struct ip)) { 5729145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 5730145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5731145836Smlaier goto bad; 5732145836Smlaier } 5733126258Smlaier ip = mtod(m0, struct ip *); 5734126258Smlaier } 5735126258Smlaier 5736127145Smlaier#ifdef __FreeBSD__ 5737126261Smlaier /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 5738126261Smlaier m0->m_pkthdr.csum_flags |= CSUM_IP; 5739126261Smlaier sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5740126261Smlaier if (sw_csum & CSUM_DELAY_DATA) { 5741126261Smlaier /* 5742126261Smlaier * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 5743126261Smlaier */ 5744126261Smlaier NTOHS(ip->ip_len); 5745126261Smlaier NTOHS(ip->ip_off); /* XXX: needed? */ 5746126261Smlaier in_delayed_cksum(m0); 5747126261Smlaier HTONS(ip->ip_len); 5748126261Smlaier HTONS(ip->ip_off); 5749126261Smlaier sw_csum &= ~CSUM_DELAY_DATA; 5750126261Smlaier } 5751126261Smlaier m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5752126261Smlaier 5753126261Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu || 5754126261Smlaier (ifp->if_hwassist & CSUM_FRAGMENT && 5755126261Smlaier ((ip->ip_off & htons(IP_DF)) == 0))) { 5756126261Smlaier /* 5757126261Smlaier * ip->ip_len = htons(ip->ip_len); 5758126261Smlaier * ip->ip_off = htons(ip->ip_off); 5759126261Smlaier */ 5760126261Smlaier ip->ip_sum = 0; 5761126261Smlaier if (sw_csum & CSUM_DELAY_IP) { 5762126261Smlaier /* From KAME */ 5763126261Smlaier if (ip->ip_v == IPVERSION && 5764126261Smlaier (ip->ip_hl << 2) == sizeof(*ip)) { 5765126261Smlaier ip->ip_sum = in_cksum_hdr(ip); 5766126261Smlaier } else { 5767126261Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5768126261Smlaier } 5769126261Smlaier } 5770126261Smlaier PF_UNLOCK(); 5771126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt); 5772126261Smlaier PF_LOCK(); 5773126261Smlaier goto done; 5774126261Smlaier } 5775126261Smlaier 5776126261Smlaier#else 5777126258Smlaier /* Copied from ip_output. */ 5778130613Smlaier#ifdef IPSEC 5779130613Smlaier /* 5780130613Smlaier * If deferred crypto processing is needed, check that the 5781130613Smlaier * interface supports it. 5782130613Smlaier */ 5783130613Smlaier if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 5784130613Smlaier != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 5785130613Smlaier /* Notify IPsec to do its own crypto. */ 5786130613Smlaier ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 5787130613Smlaier goto bad; 5788130613Smlaier } 5789130613Smlaier#endif /* IPSEC */ 5790130613Smlaier 5791130613Smlaier /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 5792130613Smlaier if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT) { 5793130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 5794130613Smlaier ifp->if_bridge != NULL) { 5795130613Smlaier in_delayed_cksum(m0); 5796130613Smlaier m0->m_pkthdr.csum &= ~M_TCPV4_CSUM_OUT; /* Clear */ 5797130613Smlaier } 5798130613Smlaier } else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT) { 5799130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 5800130613Smlaier ifp->if_bridge != NULL) { 5801130613Smlaier in_delayed_cksum(m0); 5802130613Smlaier m0->m_pkthdr.csum &= ~M_UDPV4_CSUM_OUT; /* Clear */ 5803130613Smlaier } 5804130613Smlaier } 5805130613Smlaier 5806126258Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu) { 5807126258Smlaier if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 5808126258Smlaier ifp->if_bridge == NULL) { 5809126258Smlaier m0->m_pkthdr.csum |= M_IPV4_CSUM_OUT; 5810126258Smlaier ipstat.ips_outhwcsum++; 5811126258Smlaier } else { 5812126258Smlaier ip->ip_sum = 0; 5813126258Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5814126258Smlaier } 5815126258Smlaier /* Update relevant hardware checksum stats for TCP/UDP */ 5816126258Smlaier if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT) 5817126258Smlaier tcpstat.tcps_outhwcsum++; 5818126258Smlaier else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT) 5819126258Smlaier udpstat.udps_outhwcsum++; 5820126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 5821126258Smlaier goto done; 5822126258Smlaier } 5823126261Smlaier#endif 5824126258Smlaier /* 5825126258Smlaier * Too large for interface; fragment if possible. 5826126258Smlaier * Must be able to put at least 8 bytes per fragment. 5827126258Smlaier */ 5828126258Smlaier if (ip->ip_off & htons(IP_DF)) { 5829126258Smlaier ipstat.ips_cantfrag++; 5830126258Smlaier if (r->rt != PF_DUPTO) { 5831127145Smlaier#ifdef __FreeBSD__ 5832126261Smlaier /* icmp_error() expects host byte ordering */ 5833126261Smlaier NTOHS(ip->ip_len); 5834126261Smlaier NTOHS(ip->ip_off); 5835126261Smlaier PF_UNLOCK(); 5836126258Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5837145886Smlaier ifp->if_mtu); 5838145874Smlaier PF_LOCK(); 5839145874Smlaier#else 5840145874Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5841145873Smlaier ifp); 5842126261Smlaier#endif 5843126258Smlaier goto done; 5844126258Smlaier } else 5845126258Smlaier goto bad; 5846126258Smlaier } 5847126258Smlaier 5848126258Smlaier m1 = m0; 5849127145Smlaier#ifdef __FreeBSD__ 5850126261Smlaier /* 5851126261Smlaier * XXX: is cheaper + less error prone than own function 5852126261Smlaier */ 5853126261Smlaier NTOHS(ip->ip_len); 5854126261Smlaier NTOHS(ip->ip_off); 5855126261Smlaier error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5856126261Smlaier#else 5857126258Smlaier error = ip_fragment(m0, ifp, ifp->if_mtu); 5858126261Smlaier#endif 5859127531Smlaier if (error) { 5860127531Smlaier#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 5861127531Smlaier m0 = NULL; 5862126261Smlaier#endif 5863126258Smlaier goto bad; 5864127531Smlaier } 5865126258Smlaier 5866126258Smlaier for (m0 = m1; m0; m0 = m1) { 5867126258Smlaier m1 = m0->m_nextpkt; 5868126258Smlaier m0->m_nextpkt = 0; 5869127145Smlaier#ifdef __FreeBSD__ 5870126261Smlaier if (error == 0) { 5871126261Smlaier PF_UNLOCK(); 5872126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5873126261Smlaier NULL); 5874126261Smlaier PF_LOCK(); 5875126261Smlaier } else 5876126261Smlaier#else 5877126258Smlaier if (error == 0) 5878126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5879126258Smlaier NULL); 5880126258Smlaier else 5881126261Smlaier#endif 5882126258Smlaier m_freem(m0); 5883126258Smlaier } 5884126258Smlaier 5885126258Smlaier if (error == 0) 5886126258Smlaier ipstat.ips_fragmented++; 5887126258Smlaier 5888126258Smlaierdone: 5889126258Smlaier if (r->rt != PF_DUPTO) 5890126258Smlaier *m = NULL; 5891126258Smlaier if (ro == &iproute && ro->ro_rt) 5892126258Smlaier RTFREE(ro->ro_rt); 5893126258Smlaier return; 5894126258Smlaier 5895126258Smlaierbad: 5896126258Smlaier m_freem(m0); 5897126258Smlaier goto done; 5898126258Smlaier} 5899126258Smlaier#endif /* INET */ 5900126258Smlaier 5901126258Smlaier#ifdef INET6 5902126258Smlaiervoid 5903126258Smlaierpf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5904126258Smlaier struct pf_state *s) 5905126258Smlaier{ 5906126258Smlaier struct mbuf *m0; 5907126258Smlaier struct m_tag *mtag; 5908126258Smlaier struct route_in6 ip6route; 5909126258Smlaier struct route_in6 *ro; 5910126258Smlaier struct sockaddr_in6 *dst; 5911126258Smlaier struct ip6_hdr *ip6; 5912126258Smlaier struct ifnet *ifp = NULL; 5913126258Smlaier struct pf_addr naddr; 5914130613Smlaier struct pf_src_node *sn = NULL; 5915126258Smlaier int error = 0; 5916126258Smlaier 5917126258Smlaier if (m == NULL || *m == NULL || r == NULL || 5918126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5919126258Smlaier panic("pf_route6: invalid parameters"); 5920126258Smlaier 5921132303Smlaier if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) { 5922132303Smlaier if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) == 5923132303Smlaier NULL) { 5924132303Smlaier m0 = *m; 5925132303Smlaier *m = NULL; 5926132303Smlaier goto bad; 5927132303Smlaier } 5928132303Smlaier *(char *)(mtag + 1) = 1; 5929132303Smlaier m_tag_prepend(*m, mtag); 5930132303Smlaier } else { 5931132303Smlaier if (*(char *)(mtag + 1) > 3) { 5932132303Smlaier m0 = *m; 5933132303Smlaier *m = NULL; 5934132303Smlaier goto bad; 5935132303Smlaier } 5936132303Smlaier (*(char *)(mtag + 1))++; 5937132303Smlaier } 5938132303Smlaier 5939126258Smlaier if (r->rt == PF_DUPTO) { 5940127145Smlaier#ifdef __FreeBSD__ 5941132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 5942126261Smlaier#else 5943132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5944126261Smlaier#endif 5945126258Smlaier return; 5946126258Smlaier } else { 5947126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5948126258Smlaier return; 5949126258Smlaier m0 = *m; 5950126258Smlaier } 5951126258Smlaier 5952145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 5953145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 5954145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5955145836Smlaier goto bad; 5956145836Smlaier } 5957126258Smlaier ip6 = mtod(m0, struct ip6_hdr *); 5958126258Smlaier 5959126258Smlaier ro = &ip6route; 5960126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 5961126258Smlaier dst = (struct sockaddr_in6 *)&ro->ro_dst; 5962126258Smlaier dst->sin6_family = AF_INET6; 5963126258Smlaier dst->sin6_len = sizeof(*dst); 5964126258Smlaier dst->sin6_addr = ip6->ip6_dst; 5965126258Smlaier 5966126258Smlaier /* Cheat. */ 5967126258Smlaier if (r->rt == PF_FASTROUTE) { 5968127145Smlaier#ifdef __FreeBSD__ 5969132280Smlaier m0->m_flags |= M_SKIP_FIREWALL; 5970126261Smlaier PF_UNLOCK(); 5971126261Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5972126261Smlaier PF_LOCK(); 5973126261Smlaier#else 5974132280Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 5975132280Smlaier if (mtag == NULL) 5976132280Smlaier goto bad; 5977132280Smlaier m_tag_prepend(m0, mtag); 5978126258Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL); 5979126261Smlaier#endif 5980126258Smlaier return; 5981126258Smlaier } 5982126258Smlaier 5983145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 5984145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 5985145836Smlaier ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5986145836Smlaier goto bad; 5987145836Smlaier } 5988126258Smlaier if (s == NULL) { 5989130613Smlaier pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5990130613Smlaier &naddr, NULL, &sn); 5991126258Smlaier if (!PF_AZERO(&naddr, AF_INET6)) 5992126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5993126258Smlaier &naddr, AF_INET6); 5994130613Smlaier ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5995126258Smlaier } else { 5996126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5997126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5998126258Smlaier &s->rt_addr, AF_INET6); 5999130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6000126258Smlaier } 6001126258Smlaier if (ifp == NULL) 6002126258Smlaier goto bad; 6003126258Smlaier 6004126258Smlaier if (oifp != ifp) { 6005127145Smlaier#ifdef __FreeBSD__ 6006132303Smlaier PF_UNLOCK(); 6007145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6008126261Smlaier PF_LOCK(); 6009132303Smlaier goto bad; 6010132303Smlaier } else if (m0 == NULL) { 6011132303Smlaier PF_LOCK(); 6012132303Smlaier goto done; 6013132303Smlaier } 6014132303Smlaier PF_LOCK(); 6015126261Smlaier#else 6016145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6017132303Smlaier goto bad; 6018132303Smlaier else if (m0 == NULL) 6019132303Smlaier goto done; 6020126261Smlaier#endif 6021145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 6022145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6023145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6024145836Smlaier goto bad; 6025145836Smlaier } 6026132303Smlaier ip6 = mtod(m0, struct ip6_hdr *); 6027126258Smlaier } 6028126258Smlaier 6029126258Smlaier /* 6030126258Smlaier * If the packet is too large for the outgoing interface, 6031126258Smlaier * send back an icmp6 error. 6032126258Smlaier */ 6033126258Smlaier if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 6034126258Smlaier dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6035126258Smlaier if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6036127145Smlaier#ifdef __FreeBSD__ 6037126261Smlaier PF_UNLOCK(); 6038126261Smlaier#endif 6039126258Smlaier error = nd6_output(ifp, ifp, m0, dst, NULL); 6040127145Smlaier#ifdef __FreeBSD__ 6041126261Smlaier PF_LOCK(); 6042126261Smlaier#endif 6043126258Smlaier } else { 6044126258Smlaier in6_ifstat_inc(ifp, ifs6_in_toobig); 6045127145Smlaier#ifdef __FreeBSD__ 6046126261Smlaier if (r->rt != PF_DUPTO) { 6047126261Smlaier PF_UNLOCK(); 6048126261Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6049126261Smlaier PF_LOCK(); 6050126261Smlaier } else 6051126261Smlaier#else 6052126258Smlaier if (r->rt != PF_DUPTO) 6053126258Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6054126258Smlaier else 6055126261Smlaier#endif 6056126258Smlaier goto bad; 6057126258Smlaier } 6058126258Smlaier 6059126258Smlaierdone: 6060126258Smlaier if (r->rt != PF_DUPTO) 6061126258Smlaier *m = NULL; 6062126258Smlaier return; 6063126258Smlaier 6064126258Smlaierbad: 6065126258Smlaier m_freem(m0); 6066126258Smlaier goto done; 6067126258Smlaier} 6068126258Smlaier#endif /* INET6 */ 6069126258Smlaier 6070126258Smlaier 6071127145Smlaier#ifdef __FreeBSD__ 6072126258Smlaier/* 6073132566Smlaier * FreeBSD supports cksum offloads for the following drivers. 6074137413Sru * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6075132566Smlaier * ti(4), txp(4), xl(4) 6076132566Smlaier * 6077132566Smlaier * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6078132566Smlaier * network driver performed cksum including pseudo header, need to verify 6079132566Smlaier * csum_data 6080132566Smlaier * CSUM_DATA_VALID : 6081132566Smlaier * network driver performed cksum, needs to additional pseudo header 6082132566Smlaier * cksum computation with partial csum_data(i.e. lack of H/W support for 6083132566Smlaier * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6084132566Smlaier * 6085132566Smlaier * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6086132566Smlaier * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6087132566Smlaier * TCP/UDP layer. 6088132566Smlaier * Also, set csum_data to 0xffff to force cksum validation. 6089126261Smlaier */ 6090126261Smlaierint 6091126261Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6092126261Smlaier{ 6093126261Smlaier u_int16_t sum = 0; 6094126261Smlaier int hw_assist = 0; 6095126261Smlaier struct ip *ip; 6096126261Smlaier 6097126261Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6098126261Smlaier return (1); 6099126261Smlaier if (m->m_pkthdr.len < off + len) 6100126261Smlaier return (1); 6101126261Smlaier 6102126261Smlaier switch (p) { 6103126261Smlaier case IPPROTO_TCP: 6104126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6105126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6106126261Smlaier sum = m->m_pkthdr.csum_data; 6107126261Smlaier } else { 6108126261Smlaier ip = mtod(m, struct ip *); 6109126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6110135078Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6111135078Smlaier m->m_pkthdr.csum_data + IPPROTO_TCP)); 6112126261Smlaier } 6113126261Smlaier sum ^= 0xffff; 6114126261Smlaier ++hw_assist; 6115126261Smlaier } 6116126261Smlaier break; 6117126261Smlaier case IPPROTO_UDP: 6118126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6119126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6120126261Smlaier sum = m->m_pkthdr.csum_data; 6121126261Smlaier } else { 6122126261Smlaier ip = mtod(m, struct ip *); 6123126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6124126261Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6125126261Smlaier m->m_pkthdr.csum_data + IPPROTO_UDP)); 6126126261Smlaier } 6127126261Smlaier sum ^= 0xffff; 6128126261Smlaier ++hw_assist; 6129126261Smlaier } 6130126261Smlaier break; 6131126261Smlaier case IPPROTO_ICMP: 6132126261Smlaier#ifdef INET6 6133126261Smlaier case IPPROTO_ICMPV6: 6134126261Smlaier#endif /* INET6 */ 6135126261Smlaier break; 6136126261Smlaier default: 6137126261Smlaier return (1); 6138126261Smlaier } 6139126261Smlaier 6140126261Smlaier if (!hw_assist) { 6141126261Smlaier switch (af) { 6142126261Smlaier case AF_INET: 6143126261Smlaier if (p == IPPROTO_ICMP) { 6144126261Smlaier if (m->m_len < off) 6145126261Smlaier return (1); 6146126261Smlaier m->m_data += off; 6147126261Smlaier m->m_len -= off; 6148126261Smlaier sum = in_cksum(m, len); 6149126261Smlaier m->m_data -= off; 6150126261Smlaier m->m_len += off; 6151126261Smlaier } else { 6152126261Smlaier if (m->m_len < sizeof(struct ip)) 6153126261Smlaier return (1); 6154126261Smlaier sum = in4_cksum(m, p, off, len); 6155126261Smlaier } 6156126261Smlaier break; 6157126261Smlaier#ifdef INET6 6158126261Smlaier case AF_INET6: 6159126261Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6160126261Smlaier return (1); 6161126261Smlaier sum = in6_cksum(m, p, off, len); 6162126261Smlaier break; 6163126261Smlaier#endif /* INET6 */ 6164126261Smlaier default: 6165126261Smlaier return (1); 6166126261Smlaier } 6167126261Smlaier } 6168126261Smlaier if (sum) { 6169126261Smlaier switch (p) { 6170126261Smlaier case IPPROTO_TCP: 6171126261Smlaier tcpstat.tcps_rcvbadsum++; 6172126261Smlaier break; 6173126261Smlaier case IPPROTO_UDP: 6174126261Smlaier udpstat.udps_badsum++; 6175126261Smlaier break; 6176126261Smlaier case IPPROTO_ICMP: 6177126261Smlaier icmpstat.icps_checksum++; 6178126261Smlaier break; 6179126261Smlaier#ifdef INET6 6180126261Smlaier case IPPROTO_ICMPV6: 6181126261Smlaier icmp6stat.icp6s_checksum++; 6182126261Smlaier break; 6183126261Smlaier#endif /* INET6 */ 6184126261Smlaier } 6185126261Smlaier return (1); 6186132566Smlaier } else { 6187132566Smlaier if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6188132566Smlaier m->m_pkthdr.csum_flags |= 6189132566Smlaier (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6190132566Smlaier m->m_pkthdr.csum_data = 0xffff; 6191132566Smlaier } 6192126261Smlaier } 6193126261Smlaier return (0); 6194126261Smlaier} 6195126261Smlaier#else 6196126261Smlaier/* 6197126258Smlaier * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6198126258Smlaier * off is the offset where the protocol header starts 6199126258Smlaier * len is the total length of protocol header plus payload 6200126258Smlaier * returns 0 when the checksum is valid, otherwise returns 1. 6201126258Smlaier */ 6202126258Smlaierint 6203130613Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6204130613Smlaier sa_family_t af) 6205126258Smlaier{ 6206126258Smlaier u_int16_t flag_ok, flag_bad; 6207126258Smlaier u_int16_t sum; 6208126258Smlaier 6209126258Smlaier switch (p) { 6210126258Smlaier case IPPROTO_TCP: 6211126258Smlaier flag_ok = M_TCP_CSUM_IN_OK; 6212126258Smlaier flag_bad = M_TCP_CSUM_IN_BAD; 6213126258Smlaier break; 6214126258Smlaier case IPPROTO_UDP: 6215126258Smlaier flag_ok = M_UDP_CSUM_IN_OK; 6216126258Smlaier flag_bad = M_UDP_CSUM_IN_BAD; 6217126258Smlaier break; 6218126258Smlaier case IPPROTO_ICMP: 6219126258Smlaier#ifdef INET6 6220126258Smlaier case IPPROTO_ICMPV6: 6221126258Smlaier#endif /* INET6 */ 6222126258Smlaier flag_ok = flag_bad = 0; 6223126258Smlaier break; 6224126258Smlaier default: 6225126258Smlaier return (1); 6226126258Smlaier } 6227126258Smlaier if (m->m_pkthdr.csum & flag_ok) 6228126258Smlaier return (0); 6229126258Smlaier if (m->m_pkthdr.csum & flag_bad) 6230126258Smlaier return (1); 6231126258Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6232126258Smlaier return (1); 6233126258Smlaier if (m->m_pkthdr.len < off + len) 6234126258Smlaier return (1); 6235145836Smlaier switch (af) { 6236145836Smlaier#ifdef INET 6237126258Smlaier case AF_INET: 6238126258Smlaier if (p == IPPROTO_ICMP) { 6239126258Smlaier if (m->m_len < off) 6240126258Smlaier return (1); 6241126258Smlaier m->m_data += off; 6242126258Smlaier m->m_len -= off; 6243126258Smlaier sum = in_cksum(m, len); 6244126258Smlaier m->m_data -= off; 6245126258Smlaier m->m_len += off; 6246126258Smlaier } else { 6247126258Smlaier if (m->m_len < sizeof(struct ip)) 6248126258Smlaier return (1); 6249126258Smlaier sum = in4_cksum(m, p, off, len); 6250126258Smlaier } 6251126258Smlaier break; 6252145836Smlaier#endif /* INET */ 6253126258Smlaier#ifdef INET6 6254126258Smlaier case AF_INET6: 6255126258Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6256126258Smlaier return (1); 6257126258Smlaier sum = in6_cksum(m, p, off, len); 6258126258Smlaier break; 6259126258Smlaier#endif /* INET6 */ 6260126258Smlaier default: 6261126258Smlaier return (1); 6262126258Smlaier } 6263126258Smlaier if (sum) { 6264126258Smlaier m->m_pkthdr.csum |= flag_bad; 6265126258Smlaier switch (p) { 6266126258Smlaier case IPPROTO_TCP: 6267126258Smlaier tcpstat.tcps_rcvbadsum++; 6268126258Smlaier break; 6269126258Smlaier case IPPROTO_UDP: 6270126258Smlaier udpstat.udps_badsum++; 6271126258Smlaier break; 6272126258Smlaier case IPPROTO_ICMP: 6273126258Smlaier icmpstat.icps_checksum++; 6274126258Smlaier break; 6275126258Smlaier#ifdef INET6 6276126258Smlaier case IPPROTO_ICMPV6: 6277126258Smlaier icmp6stat.icp6s_checksum++; 6278126258Smlaier break; 6279126258Smlaier#endif /* INET6 */ 6280126258Smlaier } 6281126258Smlaier return (1); 6282126258Smlaier } 6283126258Smlaier m->m_pkthdr.csum |= flag_ok; 6284126258Smlaier return (0); 6285126258Smlaier} 6286126261Smlaier#endif 6287126258Smlaier 6288130613Smlaierstatic int 6289130613Smlaierpf_add_mbuf_tag(struct mbuf *m, u_int tag) 6290130613Smlaier{ 6291130613Smlaier struct m_tag *mtag; 6292130613Smlaier 6293130613Smlaier if (m_tag_find(m, tag, NULL) != NULL) 6294130613Smlaier return (0); 6295130613Smlaier mtag = m_tag_get(tag, 0, M_NOWAIT); 6296130613Smlaier if (mtag == NULL) 6297130613Smlaier return (1); 6298130613Smlaier m_tag_prepend(m, mtag); 6299130613Smlaier return (0); 6300130613Smlaier} 6301130613Smlaier 6302126258Smlaier#ifdef INET 6303126258Smlaierint 6304135920Smlaier#ifdef __FreeBSD__ 6305145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6306145836Smlaier struct ether_header *eh, struct inpcb *inp) 6307135920Smlaier#else 6308145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6309145836Smlaier struct ether_header *eh) 6310135920Smlaier#endif 6311126258Smlaier{ 6312130613Smlaier struct pfi_kif *kif; 6313130613Smlaier u_short action, reason = 0, log = 0; 6314130613Smlaier struct mbuf *m = *m0; 6315130613Smlaier struct ip *h = NULL; /* make the compiler happy */ 6316130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6317130613Smlaier struct pf_state *s = NULL; 6318130613Smlaier struct pf_ruleset *ruleset = NULL; 6319130613Smlaier struct pf_pdesc pd; 6320130613Smlaier int off, dirndx, pqid = 0; 6321126258Smlaier 6322127145Smlaier#ifdef __FreeBSD__ 6323126261Smlaier PF_LOCK(); 6324126261Smlaier#endif 6325126258Smlaier if (!pf_status.running || 6326127145Smlaier#ifdef __FreeBSD__ 6327132280Smlaier (m->m_flags & M_SKIP_FIREWALL)) { 6328126261Smlaier PF_UNLOCK(); 6329132280Smlaier#else 6330132280Smlaier (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) { 6331126261Smlaier#endif 6332126261Smlaier return (PF_PASS); 6333126261Smlaier } 6334126258Smlaier 6335145836Smlaier#ifdef __FreeBSD__ 6336145836Smlaier /* XXX_IMPORT: later */ 6337145836Smlaier#else 6338145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6339145836Smlaier ifp = ifp->if_carpdev; 6340145836Smlaier#endif 6341145836Smlaier 6342130613Smlaier kif = pfi_index2kif[ifp->if_index]; 6343130613Smlaier if (kif == NULL) { 6344130613Smlaier#ifdef __FreeBSD__ 6345130613Smlaier PF_UNLOCK(); 6346130613Smlaier#endif 6347145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6348145836Smlaier ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6349130613Smlaier return (PF_DROP); 6350130613Smlaier } 6351145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6352145836Smlaier#ifdef __FreeBSD__ 6353145836Smlaier PF_UNLOCK(); 6354145836Smlaier#endif 6355145836Smlaier return (PF_PASS); 6356145836Smlaier } 6357130613Smlaier 6358130613Smlaier#ifdef __FreeBSD__ 6359126261Smlaier M_ASSERTPKTHDR(m); 6360126261Smlaier#else 6361126258Smlaier#ifdef DIAGNOSTIC 6362126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 6363126258Smlaier panic("non-M_PKTHDR is passed to pf_test"); 6364145836Smlaier#endif /* DIAGNOSTIC */ 6365145836Smlaier#endif /* __FreeBSD__ */ 6366126258Smlaier 6367130613Smlaier memset(&pd, 0, sizeof(pd)); 6368126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 6369126258Smlaier action = PF_DROP; 6370126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6371126258Smlaier log = 1; 6372126258Smlaier goto done; 6373126258Smlaier } 6374126258Smlaier 6375126258Smlaier /* We do IP header normalization and packet reassembly here */ 6376145836Smlaier if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6377126258Smlaier action = PF_DROP; 6378126258Smlaier goto done; 6379126258Smlaier } 6380126258Smlaier m = *m0; 6381126258Smlaier h = mtod(m, struct ip *); 6382126258Smlaier 6383126258Smlaier off = h->ip_hl << 2; 6384126258Smlaier if (off < (int)sizeof(*h)) { 6385126258Smlaier action = PF_DROP; 6386126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6387126258Smlaier log = 1; 6388126258Smlaier goto done; 6389126258Smlaier } 6390126258Smlaier 6391126258Smlaier pd.src = (struct pf_addr *)&h->ip_src; 6392126258Smlaier pd.dst = (struct pf_addr *)&h->ip_dst; 6393130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 6394126258Smlaier pd.ip_sum = &h->ip_sum; 6395126258Smlaier pd.proto = h->ip_p; 6396126258Smlaier pd.af = AF_INET; 6397126258Smlaier pd.tos = h->ip_tos; 6398126258Smlaier pd.tot_len = ntohs(h->ip_len); 6399145836Smlaier pd.eh = eh; 6400126258Smlaier 6401126258Smlaier /* handle fragments that didn't get reassembled by normalization */ 6402126258Smlaier if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6403130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 6404126258Smlaier &pd, &a, &ruleset); 6405126258Smlaier goto done; 6406126258Smlaier } 6407126258Smlaier 6408126258Smlaier switch (h->ip_p) { 6409126258Smlaier 6410126258Smlaier case IPPROTO_TCP: { 6411126258Smlaier struct tcphdr th; 6412126258Smlaier 6413126258Smlaier pd.hdr.tcp = &th; 6414126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 6415126258Smlaier &action, &reason, AF_INET)) { 6416126258Smlaier log = action != PF_PASS; 6417126258Smlaier goto done; 6418126258Smlaier } 6419126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6420126258Smlaier ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 6421126258Smlaier action = PF_DROP; 6422126258Smlaier goto done; 6423126258Smlaier } 6424126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 6425126258Smlaier if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6426126258Smlaier pqid = 1; 6427130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6428126258Smlaier if (action == PF_DROP) 6429130613Smlaier goto done; 6430130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6431126258Smlaier &reason); 6432126258Smlaier if (action == PF_PASS) { 6433130613Smlaier#if NPFSYNC 6434130613Smlaier pfsync_update_state(s); 6435145836Smlaier#endif /* NPFSYNC */ 6436126258Smlaier r = s->rule.ptr; 6437130613Smlaier a = s->anchor.ptr; 6438126258Smlaier log = s->log; 6439126258Smlaier } else if (s == NULL) 6440135920Smlaier#ifdef __FreeBSD__ 6441130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6442145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6443135920Smlaier#else 6444135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6445145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6446135920Smlaier#endif 6447126258Smlaier break; 6448126258Smlaier } 6449126258Smlaier 6450126258Smlaier case IPPROTO_UDP: { 6451126258Smlaier struct udphdr uh; 6452126258Smlaier 6453126258Smlaier pd.hdr.udp = &uh; 6454126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6455126258Smlaier &action, &reason, AF_INET)) { 6456126258Smlaier log = action != PF_PASS; 6457126258Smlaier goto done; 6458126258Smlaier } 6459126258Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6460126258Smlaier off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 6461126258Smlaier action = PF_DROP; 6462126258Smlaier goto done; 6463126258Smlaier } 6464130613Smlaier if (uh.uh_dport == 0 || 6465130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6466130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6467130613Smlaier action = PF_DROP; 6468130613Smlaier goto done; 6469130613Smlaier } 6470130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6471126258Smlaier if (action == PF_PASS) { 6472130613Smlaier#if NPFSYNC 6473130613Smlaier pfsync_update_state(s); 6474145836Smlaier#endif /* NPFSYNC */ 6475126258Smlaier r = s->rule.ptr; 6476126258Smlaier a = s->anchor.ptr; 6477126258Smlaier log = s->log; 6478126258Smlaier } else if (s == NULL) 6479135920Smlaier#ifdef __FreeBSD__ 6480130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 6481145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6482135920Smlaier#else 6483135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 6484145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6485135920Smlaier#endif 6486126258Smlaier break; 6487126258Smlaier } 6488126258Smlaier 6489126258Smlaier case IPPROTO_ICMP: { 6490126258Smlaier struct icmp ih; 6491126258Smlaier 6492126258Smlaier pd.hdr.icmp = &ih; 6493126258Smlaier if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6494126258Smlaier &action, &reason, AF_INET)) { 6495126258Smlaier log = action != PF_PASS; 6496126258Smlaier goto done; 6497126258Smlaier } 6498126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6499126258Smlaier ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 6500126258Smlaier action = PF_DROP; 6501126258Smlaier goto done; 6502126258Smlaier } 6503145836Smlaier action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6504145836Smlaier &reason); 6505126258Smlaier if (action == PF_PASS) { 6506130613Smlaier#if NPFSYNC 6507130613Smlaier pfsync_update_state(s); 6508145836Smlaier#endif /* NPFSYNC */ 6509126258Smlaier r = s->rule.ptr; 6510126258Smlaier a = s->anchor.ptr; 6511126258Smlaier log = s->log; 6512126258Smlaier } else if (s == NULL) 6513145836Smlaier#ifdef __FreeBSD__ 6514130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6515145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 6516145836Smlaier#else 6517145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6518145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6519145836Smlaier#endif 6520126258Smlaier break; 6521126258Smlaier } 6522126258Smlaier 6523126258Smlaier default: 6524130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 6525126258Smlaier if (action == PF_PASS) { 6526130613Smlaier#if NPFSYNC 6527130613Smlaier pfsync_update_state(s); 6528145836Smlaier#endif /* NPFSYNC */ 6529126258Smlaier r = s->rule.ptr; 6530126258Smlaier a = s->anchor.ptr; 6531126258Smlaier log = s->log; 6532126258Smlaier } else if (s == NULL) 6533145836Smlaier#ifdef __FreeBSD__ 6534130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6535145836Smlaier &pd, &a, &ruleset, NULL); 6536145836Smlaier#else 6537145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6538145836Smlaier &pd, &a, &ruleset, &ipintrq); 6539145836Smlaier#endif 6540126258Smlaier break; 6541126258Smlaier } 6542126258Smlaier 6543126258Smlaierdone: 6544126258Smlaier if (action == PF_PASS && h->ip_hl > 5 && 6545126258Smlaier !((s && s->allow_opts) || r->allow_opts)) { 6546126258Smlaier action = PF_DROP; 6547145836Smlaier REASON_SET(&reason, PFRES_IPOPTIONS); 6548126258Smlaier log = 1; 6549126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 6550126258Smlaier ("pf: dropping packet with ip options\n")); 6551126258Smlaier } 6552126258Smlaier 6553145836Smlaier if (s && s->tag) 6554145836Smlaier pf_tag_packet(m, pf_get_tag(m), s->tag); 6555145836Smlaier 6556126258Smlaier#ifdef ALTQ 6557126258Smlaier if (action == PF_PASS && r->qid) { 6558126258Smlaier struct m_tag *mtag; 6559126258Smlaier struct altq_tag *atag; 6560126258Smlaier 6561126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 6562126258Smlaier if (mtag != NULL) { 6563126258Smlaier atag = (struct altq_tag *)(mtag + 1); 6564126258Smlaier if (pqid || pd.tos == IPTOS_LOWDELAY) 6565126258Smlaier atag->qid = r->pqid; 6566126258Smlaier else 6567126258Smlaier atag->qid = r->qid; 6568126258Smlaier /* add hints for ecn */ 6569126258Smlaier atag->af = AF_INET; 6570126258Smlaier atag->hdr = h; 6571126258Smlaier m_tag_prepend(m, mtag); 6572126258Smlaier } 6573126258Smlaier } 6574145836Smlaier#endif /* ALTQ */ 6575126258Smlaier 6576130613Smlaier /* 6577130613Smlaier * connections redirected to loopback should not match sockets 6578130613Smlaier * bound specifically to loopback due to security implications, 6579130613Smlaier * see tcp_input() and in_pcblookup_listen(). 6580130613Smlaier */ 6581130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6582130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6583130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 6584130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 6585130613Smlaier (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET && 6586130613Smlaier pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) { 6587130613Smlaier action = PF_DROP; 6588130613Smlaier REASON_SET(&reason, PFRES_MEMORY); 6589130613Smlaier } 6590130613Smlaier 6591126258Smlaier if (log) 6592130613Smlaier PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset); 6593126258Smlaier 6594130613Smlaier kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6595130613Smlaier kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6596130613Smlaier 6597130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 6598130613Smlaier r->packets++; 6599130613Smlaier r->bytes += pd.tot_len; 6600130613Smlaier if (a != NULL) { 6601130613Smlaier a->packets++; 6602130613Smlaier a->bytes += pd.tot_len; 6603130613Smlaier } 6604130613Smlaier if (s != NULL) { 6605130613Smlaier dirndx = (dir == s->direction) ? 0 : 1; 6606130613Smlaier s->packets[dirndx]++; 6607130613Smlaier s->bytes[dirndx] += pd.tot_len; 6608130613Smlaier if (s->nat_rule.ptr != NULL) { 6609130613Smlaier s->nat_rule.ptr->packets++; 6610130613Smlaier s->nat_rule.ptr->bytes += pd.tot_len; 6611130613Smlaier } 6612130613Smlaier if (s->src_node != NULL) { 6613130613Smlaier s->src_node->packets++; 6614130613Smlaier s->src_node->bytes += pd.tot_len; 6615130613Smlaier } 6616130613Smlaier if (s->nat_src_node != NULL) { 6617130613Smlaier s->nat_src_node->packets++; 6618130613Smlaier s->nat_src_node->bytes += pd.tot_len; 6619130613Smlaier } 6620130613Smlaier } 6621130613Smlaier tr = r; 6622130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6623130613Smlaier if (nr != NULL) { 6624130613Smlaier struct pf_addr *x; 6625130613Smlaier /* 6626130613Smlaier * XXX: we need to make sure that the addresses 6627130613Smlaier * passed to pfr_update_stats() are the same than 6628130613Smlaier * the addresses used during matching (pfr_match) 6629130613Smlaier */ 6630130613Smlaier if (r == &pf_default_rule) { 6631130613Smlaier tr = nr; 6632130613Smlaier x = (s == NULL || s->direction == dir) ? 6633130613Smlaier &pd.baddr : &pd.naddr; 6634130613Smlaier } else 6635130613Smlaier x = (s == NULL || s->direction == dir) ? 6636130613Smlaier &pd.naddr : &pd.baddr; 6637130613Smlaier if (x == &pd.baddr || s == NULL) { 6638130613Smlaier /* we need to change the address */ 6639130613Smlaier if (dir == PF_OUT) 6640130613Smlaier pd.src = x; 6641130613Smlaier else 6642130613Smlaier pd.dst = x; 6643130613Smlaier } 6644130613Smlaier } 6645130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 6646130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 6647130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 6648130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6649145836Smlaier tr->src.neg); 6650130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 6651130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 6652130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 6653130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6654145836Smlaier tr->dst.neg); 6655130613Smlaier } 6656130613Smlaier 6657130613Smlaier 6658126258Smlaier if (action == PF_SYNPROXY_DROP) { 6659126258Smlaier m_freem(*m0); 6660126258Smlaier *m0 = NULL; 6661126258Smlaier action = PF_PASS; 6662126258Smlaier } else if (r->rt) 6663126258Smlaier /* pf_route can free the mbuf causing *m0 to become NULL */ 6664126258Smlaier pf_route(m0, r, dir, ifp, s); 6665126258Smlaier 6666127145Smlaier#ifdef __FreeBSD__ 6667126261Smlaier PF_UNLOCK(); 6668126261Smlaier#endif 6669126261Smlaier 6670126258Smlaier return (action); 6671126258Smlaier} 6672126258Smlaier#endif /* INET */ 6673126258Smlaier 6674126258Smlaier#ifdef INET6 6675126258Smlaierint 6676135920Smlaier#ifdef __FreeBSD__ 6677145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6678145836Smlaier struct ether_header *eh, struct inpcb *inp) 6679135920Smlaier#else 6680145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6681145836Smlaier struct ether_header *eh) 6682135920Smlaier#endif 6683126258Smlaier{ 6684130613Smlaier struct pfi_kif *kif; 6685130613Smlaier u_short action, reason = 0, log = 0; 6686130613Smlaier struct mbuf *m = *m0; 6687130613Smlaier struct ip6_hdr *h = NULL; /* make the compiler happy */ 6688130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6689130613Smlaier struct pf_state *s = NULL; 6690130613Smlaier struct pf_ruleset *ruleset = NULL; 6691130613Smlaier struct pf_pdesc pd; 6692130613Smlaier int off, terminal = 0, dirndx; 6693126258Smlaier 6694127145Smlaier#ifdef __FreeBSD__ 6695126261Smlaier PF_LOCK(); 6696126261Smlaier#endif 6697126261Smlaier 6698126258Smlaier if (!pf_status.running || 6699127145Smlaier#ifdef __FreeBSD__ 6700132280Smlaier (m->m_flags & M_SKIP_FIREWALL)) { 6701126261Smlaier PF_UNLOCK(); 6702132280Smlaier#else 6703132280Smlaier (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) { 6704126261Smlaier#endif 6705126258Smlaier return (PF_PASS); 6706126261Smlaier } 6707126258Smlaier 6708145836Smlaier#ifdef __FreeBSD__ 6709145836Smlaier /* XXX_IMPORT: later */ 6710145836Smlaier#else 6711145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6712145836Smlaier ifp = ifp->if_carpdev; 6713145836Smlaier#endif 6714145836Smlaier 6715130613Smlaier kif = pfi_index2kif[ifp->if_index]; 6716130613Smlaier if (kif == NULL) { 6717130613Smlaier#ifdef __FreeBSD__ 6718130613Smlaier PF_UNLOCK(); 6719130613Smlaier#endif 6720145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6721145836Smlaier ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6722130613Smlaier return (PF_DROP); 6723130613Smlaier } 6724145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6725145836Smlaier#ifdef __FreeBSD__ 6726145836Smlaier PF_UNLOCK(); 6727145836Smlaier#endif 6728145836Smlaier return (PF_PASS); 6729145836Smlaier } 6730130613Smlaier 6731130613Smlaier#ifdef __FreeBSD__ 6732126261Smlaier M_ASSERTPKTHDR(m); 6733126261Smlaier#else 6734126258Smlaier#ifdef DIAGNOSTIC 6735126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 6736145836Smlaier panic("non-M_PKTHDR is passed to pf_test6"); 6737145836Smlaier#endif /* DIAGNOSTIC */ 6738126258Smlaier#endif 6739126258Smlaier 6740130613Smlaier memset(&pd, 0, sizeof(pd)); 6741126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 6742126258Smlaier action = PF_DROP; 6743126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6744126258Smlaier log = 1; 6745126258Smlaier goto done; 6746126258Smlaier } 6747126258Smlaier 6748126258Smlaier /* We do IP header normalization and packet reassembly here */ 6749145836Smlaier if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6750126258Smlaier action = PF_DROP; 6751126258Smlaier goto done; 6752126258Smlaier } 6753126258Smlaier m = *m0; 6754126258Smlaier h = mtod(m, struct ip6_hdr *); 6755126258Smlaier 6756126258Smlaier pd.src = (struct pf_addr *)&h->ip6_src; 6757126258Smlaier pd.dst = (struct pf_addr *)&h->ip6_dst; 6758130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 6759126258Smlaier pd.ip_sum = NULL; 6760126258Smlaier pd.af = AF_INET6; 6761126258Smlaier pd.tos = 0; 6762126258Smlaier pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6763145836Smlaier pd.eh = eh; 6764126258Smlaier 6765126258Smlaier off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6766126258Smlaier pd.proto = h->ip6_nxt; 6767126258Smlaier do { 6768126258Smlaier switch (pd.proto) { 6769126258Smlaier case IPPROTO_FRAGMENT: 6770130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 6771126258Smlaier &pd, &a, &ruleset); 6772126258Smlaier if (action == PF_DROP) 6773126258Smlaier REASON_SET(&reason, PFRES_FRAG); 6774126258Smlaier goto done; 6775126258Smlaier case IPPROTO_AH: 6776126258Smlaier case IPPROTO_HOPOPTS: 6777126258Smlaier case IPPROTO_ROUTING: 6778126258Smlaier case IPPROTO_DSTOPTS: { 6779126258Smlaier /* get next header and header length */ 6780126258Smlaier struct ip6_ext opt6; 6781126258Smlaier 6782126258Smlaier if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6783145836Smlaier NULL, &reason, pd.af)) { 6784126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 6785126258Smlaier ("pf: IPv6 short opt\n")); 6786126258Smlaier action = PF_DROP; 6787126258Smlaier log = 1; 6788126258Smlaier goto done; 6789126258Smlaier } 6790126258Smlaier if (pd.proto == IPPROTO_AH) 6791126258Smlaier off += (opt6.ip6e_len + 2) * 4; 6792126258Smlaier else 6793126258Smlaier off += (opt6.ip6e_len + 1) * 8; 6794126258Smlaier pd.proto = opt6.ip6e_nxt; 6795126258Smlaier /* goto the next header */ 6796126258Smlaier break; 6797126258Smlaier } 6798126258Smlaier default: 6799126258Smlaier terminal++; 6800126258Smlaier break; 6801126258Smlaier } 6802126258Smlaier } while (!terminal); 6803126258Smlaier 6804126258Smlaier switch (pd.proto) { 6805126258Smlaier 6806126258Smlaier case IPPROTO_TCP: { 6807126258Smlaier struct tcphdr th; 6808126258Smlaier 6809126258Smlaier pd.hdr.tcp = &th; 6810126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 6811126258Smlaier &action, &reason, AF_INET6)) { 6812126258Smlaier log = action != PF_PASS; 6813126258Smlaier goto done; 6814126258Smlaier } 6815126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6816138387Sdhartmei ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 6817138387Sdhartmei IPPROTO_TCP, AF_INET6)) { 6818126258Smlaier action = PF_DROP; 6819145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6820126258Smlaier goto done; 6821126258Smlaier } 6822126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 6823130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6824126258Smlaier if (action == PF_DROP) 6825130613Smlaier goto done; 6826130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6827126258Smlaier &reason); 6828126258Smlaier if (action == PF_PASS) { 6829130613Smlaier#if NPFSYNC 6830130613Smlaier pfsync_update_state(s); 6831145836Smlaier#endif /* NPFSYNC */ 6832126258Smlaier r = s->rule.ptr; 6833130613Smlaier a = s->anchor.ptr; 6834126258Smlaier log = s->log; 6835126258Smlaier } else if (s == NULL) 6836135920Smlaier#ifdef __FreeBSD__ 6837130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6838145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6839135920Smlaier#else 6840135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6841145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 6842135920Smlaier#endif 6843126258Smlaier break; 6844126258Smlaier } 6845126258Smlaier 6846126258Smlaier case IPPROTO_UDP: { 6847126258Smlaier struct udphdr uh; 6848126258Smlaier 6849126258Smlaier pd.hdr.udp = &uh; 6850126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6851126258Smlaier &action, &reason, AF_INET6)) { 6852126258Smlaier log = action != PF_PASS; 6853126258Smlaier goto done; 6854126258Smlaier } 6855126258Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6856138387Sdhartmei off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 6857138387Sdhartmei IPPROTO_UDP, AF_INET6)) { 6858126258Smlaier action = PF_DROP; 6859145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6860126258Smlaier goto done; 6861126258Smlaier } 6862130613Smlaier if (uh.uh_dport == 0 || 6863130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6864130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6865130613Smlaier action = PF_DROP; 6866130613Smlaier goto done; 6867130613Smlaier } 6868130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6869126258Smlaier if (action == PF_PASS) { 6870130613Smlaier#if NPFSYNC 6871130613Smlaier pfsync_update_state(s); 6872145836Smlaier#endif /* NPFSYNC */ 6873126258Smlaier r = s->rule.ptr; 6874130613Smlaier a = s->anchor.ptr; 6875126258Smlaier log = s->log; 6876126258Smlaier } else if (s == NULL) 6877135920Smlaier#ifdef __FreeBSD__ 6878130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 6879145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6880135920Smlaier#else 6881135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 6882145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 6883135920Smlaier#endif 6884126258Smlaier break; 6885126258Smlaier } 6886126258Smlaier 6887126258Smlaier case IPPROTO_ICMPV6: { 6888126258Smlaier struct icmp6_hdr ih; 6889126258Smlaier 6890126258Smlaier pd.hdr.icmp6 = &ih; 6891126258Smlaier if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6892126258Smlaier &action, &reason, AF_INET6)) { 6893126258Smlaier log = action != PF_PASS; 6894126258Smlaier goto done; 6895126258Smlaier } 6896126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6897145836Smlaier ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 6898138387Sdhartmei IPPROTO_ICMPV6, AF_INET6)) { 6899126258Smlaier action = PF_DROP; 6900145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6901126258Smlaier goto done; 6902126258Smlaier } 6903130613Smlaier action = pf_test_state_icmp(&s, dir, kif, 6904145836Smlaier m, off, h, &pd, &reason); 6905126258Smlaier if (action == PF_PASS) { 6906130613Smlaier#if NPFSYNC 6907130613Smlaier pfsync_update_state(s); 6908145836Smlaier#endif /* NPFSYNC */ 6909126258Smlaier r = s->rule.ptr; 6910130613Smlaier a = s->anchor.ptr; 6911126258Smlaier log = s->log; 6912126258Smlaier } else if (s == NULL) 6913145836Smlaier#ifdef __FreeBSD__ 6914130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6915145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 6916145836Smlaier#else 6917145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6918145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 6919145836Smlaier#endif 6920126258Smlaier break; 6921126258Smlaier } 6922126258Smlaier 6923126258Smlaier default: 6924130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 6925130613Smlaier if (action == PF_PASS) { 6926145836Smlaier#if NPFSYNC 6927145836Smlaier pfsync_update_state(s); 6928145836Smlaier#endif /* NPFSYNC */ 6929130613Smlaier r = s->rule.ptr; 6930130613Smlaier a = s->anchor.ptr; 6931130613Smlaier log = s->log; 6932130613Smlaier } else if (s == NULL) 6933145836Smlaier#ifdef __FreeBSD__ 6934130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6935145836Smlaier &pd, &a, &ruleset, NULL); 6936145836Smlaier#else 6937145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6938145836Smlaier &pd, &a, &ruleset, &ip6intrq); 6939145836Smlaier#endif 6940126258Smlaier break; 6941126258Smlaier } 6942126258Smlaier 6943126258Smlaierdone: 6944126258Smlaier /* XXX handle IPv6 options, if not allowed. not implemented. */ 6945126258Smlaier 6946145836Smlaier if (s && s->tag) 6947145836Smlaier pf_tag_packet(m, pf_get_tag(m), s->tag); 6948145836Smlaier 6949126258Smlaier#ifdef ALTQ 6950126258Smlaier if (action == PF_PASS && r->qid) { 6951126258Smlaier struct m_tag *mtag; 6952126258Smlaier struct altq_tag *atag; 6953126258Smlaier 6954126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 6955126258Smlaier if (mtag != NULL) { 6956126258Smlaier atag = (struct altq_tag *)(mtag + 1); 6957126258Smlaier if (pd.tos == IPTOS_LOWDELAY) 6958126258Smlaier atag->qid = r->pqid; 6959126258Smlaier else 6960126258Smlaier atag->qid = r->qid; 6961126258Smlaier /* add hints for ecn */ 6962126258Smlaier atag->af = AF_INET6; 6963126258Smlaier atag->hdr = h; 6964126258Smlaier m_tag_prepend(m, mtag); 6965126258Smlaier } 6966126258Smlaier } 6967145836Smlaier#endif /* ALTQ */ 6968126258Smlaier 6969130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6970130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6971130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 6972130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 6973130613Smlaier IN6_IS_ADDR_LOOPBACK(&pd.dst->v6) && 6974130613Smlaier pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) { 6975130613Smlaier action = PF_DROP; 6976130613Smlaier REASON_SET(&reason, PFRES_MEMORY); 6977130613Smlaier } 6978130613Smlaier 6979126258Smlaier if (log) 6980130613Smlaier PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset); 6981126258Smlaier 6982130613Smlaier kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6983130613Smlaier kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6984130613Smlaier 6985130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 6986130613Smlaier r->packets++; 6987130613Smlaier r->bytes += pd.tot_len; 6988130613Smlaier if (a != NULL) { 6989130613Smlaier a->packets++; 6990130613Smlaier a->bytes += pd.tot_len; 6991130613Smlaier } 6992130613Smlaier if (s != NULL) { 6993130613Smlaier dirndx = (dir == s->direction) ? 0 : 1; 6994130613Smlaier s->packets[dirndx]++; 6995130613Smlaier s->bytes[dirndx] += pd.tot_len; 6996130613Smlaier if (s->nat_rule.ptr != NULL) { 6997130613Smlaier s->nat_rule.ptr->packets++; 6998130613Smlaier s->nat_rule.ptr->bytes += pd.tot_len; 6999130613Smlaier } 7000130613Smlaier if (s->src_node != NULL) { 7001130613Smlaier s->src_node->packets++; 7002130613Smlaier s->src_node->bytes += pd.tot_len; 7003130613Smlaier } 7004130613Smlaier if (s->nat_src_node != NULL) { 7005130613Smlaier s->nat_src_node->packets++; 7006130613Smlaier s->nat_src_node->bytes += pd.tot_len; 7007130613Smlaier } 7008130613Smlaier } 7009130613Smlaier tr = r; 7010130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7011130613Smlaier if (nr != NULL) { 7012130613Smlaier struct pf_addr *x; 7013130613Smlaier /* 7014130613Smlaier * XXX: we need to make sure that the addresses 7015130613Smlaier * passed to pfr_update_stats() are the same than 7016130613Smlaier * the addresses used during matching (pfr_match) 7017130613Smlaier */ 7018130613Smlaier if (r == &pf_default_rule) { 7019130613Smlaier tr = nr; 7020130613Smlaier x = (s == NULL || s->direction == dir) ? 7021130613Smlaier &pd.baddr : &pd.naddr; 7022130613Smlaier } else { 7023130613Smlaier x = (s == NULL || s->direction == dir) ? 7024130613Smlaier &pd.naddr : &pd.baddr; 7025130613Smlaier } 7026130613Smlaier if (x == &pd.baddr || s == NULL) { 7027130613Smlaier if (dir == PF_OUT) 7028130613Smlaier pd.src = x; 7029130613Smlaier else 7030130613Smlaier pd.dst = x; 7031130613Smlaier } 7032130613Smlaier } 7033130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 7034130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7035130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 7036130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7037145836Smlaier tr->src.neg); 7038130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 7039130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7040130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 7041130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7042145836Smlaier tr->dst.neg); 7043130613Smlaier } 7044130613Smlaier 7045130613Smlaier 7046126258Smlaier if (action == PF_SYNPROXY_DROP) { 7047126258Smlaier m_freem(*m0); 7048126258Smlaier *m0 = NULL; 7049126258Smlaier action = PF_PASS; 7050126258Smlaier } else if (r->rt) 7051126258Smlaier /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7052126258Smlaier pf_route6(m0, r, dir, ifp, s); 7053126258Smlaier 7054127145Smlaier#ifdef __FreeBSD__ 7055126261Smlaier PF_UNLOCK(); 7056126261Smlaier#endif 7057126258Smlaier return (action); 7058126258Smlaier} 7059126258Smlaier#endif /* INET6 */ 7060145836Smlaier 7061145836Smlaierint 7062145836Smlaierpf_check_congestion(struct ifqueue *ifq) 7063145836Smlaier{ 7064145836Smlaier#ifdef __FreeBSD__ 7065145836Smlaier /* XXX_IMPORT: later */ 7066145836Smlaier return (0); 7067145836Smlaier#else 7068145836Smlaier if (ifq->ifq_congestion) 7069145836Smlaier return (1); 7070145836Smlaier else 7071145836Smlaier return (0); 7072145836Smlaier#endif 7073145836Smlaier} 7074