pf.c revision 162238
1251881Speter/* $FreeBSD: head/sys/contrib/pf/net/pf.c 162238 2006-09-12 04:25:13Z csjp $ */ 2251881Speter/* $OpenBSD: pf.c,v 1.483 2005/03/15 17:38:43 dhartmei Exp $ */ 3251881Speter 4251881Speter/* 5251881Speter * Copyright (c) 2001 Daniel Hartmeier 6251881Speter * Copyright (c) 2002,2003 Henning Brauer 7251881Speter * All rights reserved. 8251881Speter * 9251881Speter * Redistribution and use in source and binary forms, with or without 10251881Speter * modification, are permitted provided that the following conditions 11251881Speter * are met: 12251881Speter * 13251881Speter * - Redistributions of source code must retain the above copyright 14251881Speter * notice, this list of conditions and the following disclaimer. 15251881Speter * - Redistributions in binary form must reproduce the above 16251881Speter * copyright notice, this list of conditions and the following 17251881Speter * disclaimer in the documentation and/or other materials provided 18251881Speter * with the distribution. 19251881Speter * 20251881Speter * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21251881Speter * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22251881Speter * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23251881Speter * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24251881Speter * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25251881Speter * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26251881Speter * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27251881Speter * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28251881Speter * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29251881Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 30251881Speter * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31251881Speter * POSSIBILITY OF SUCH DAMAGE. 32251881Speter * 33251881Speter * Effort sponsored in part by the Defense Advanced Research Projects 34251881Speter * Agency (DARPA) and Air Force Research Laboratory, Air Force 35251881Speter * Materiel Command, USAF, under agreement number F30602-01-2-0537. 36251881Speter * 37251881Speter */ 38251881Speter 39251881Speter#ifdef __FreeBSD__ 40251881Speter#include "opt_inet.h" 41251881Speter#include "opt_inet6.h" 42251881Speter#endif 43251881Speter 44251881Speter#ifdef __FreeBSD__ 45251881Speter#include "opt_mac.h" 46251881Speter#include "opt_bpf.h" 47251881Speter#include "opt_pf.h" 48251881Speter 49251881Speter#ifdef DEV_BPF 50251881Speter#define NBPFILTER DEV_BPF 51251881Speter#else 52251881Speter#define NBPFILTER 0 53251881Speter#endif 54251881Speter 55251881Speter#ifdef DEV_PFLOG 56251881Speter#define NPFLOG DEV_PFLOG 57251881Speter#else 58251881Speter#define NPFLOG 0 59251881Speter#endif 60251881Speter 61251881Speter#ifdef DEV_PFSYNC 62251881Speter#define NPFSYNC DEV_PFSYNC 63251881Speter#else 64251881Speter#define NPFSYNC 0 65251881Speter#endif 66251881Speter 67251881Speter#else 68251881Speter#include "bpfilter.h" 69251881Speter#include "pflog.h" 70251881Speter#include "pfsync.h" 71251881Speter#endif 72251881Speter 73251881Speter#include <sys/param.h> 74251881Speter#include <sys/systm.h> 75251881Speter#include <sys/mbuf.h> 76251881Speter#include <sys/filio.h> 77251881Speter#include <sys/socket.h> 78251881Speter#include <sys/socketvar.h> 79251881Speter#include <sys/kernel.h> 80251881Speter#include <sys/time.h> 81251881Speter#ifdef __FreeBSD__ 82251881Speter#include <sys/mac.h> 83251881Speter#include <sys/sysctl.h> 84251881Speter#include <sys/endian.h> 85251881Speter#else 86251881Speter#include <sys/pool.h> 87251881Speter#endif 88251881Speter 89251881Speter#include <net/if.h> 90251881Speter#include <net/if_types.h> 91251881Speter#include <net/bpf.h> 92251881Speter#include <net/route.h> 93251881Speter 94251881Speter#include <netinet/in.h> 95251881Speter#include <netinet/in_var.h> 96251881Speter#include <netinet/in_systm.h> 97251881Speter#include <netinet/ip.h> 98251881Speter#include <netinet/ip_var.h> 99251881Speter#include <netinet/tcp.h> 100251881Speter#include <netinet/tcp_seq.h> 101251881Speter#include <netinet/udp.h> 102251881Speter#include <netinet/ip_icmp.h> 103251881Speter#include <netinet/in_pcb.h> 104251881Speter#include <netinet/tcp_timer.h> 105251881Speter#include <netinet/tcp_var.h> 106251881Speter#include <netinet/udp_var.h> 107251881Speter#include <netinet/icmp_var.h> 108251881Speter#include <netinet/if_ether.h> 109251881Speter 110251881Speter#ifndef __FreeBSD__ 111251881Speter#include <dev/rndvar.h> 112251881Speter#endif 113251881Speter#include <net/pfvar.h> 114251881Speter#include <net/if_pflog.h> 115251881Speter 116251881Speter#if NPFSYNC > 0 117251881Speter#include <net/if_pfsync.h> 118251881Speter#endif /* NPFSYNC > 0 */ 119251881Speter 120251881Speter#ifdef INET6 121251881Speter#include <netinet/ip6.h> 122251881Speter#include <netinet/in_pcb.h> 123251881Speter#include <netinet/icmp6.h> 124251881Speter#include <netinet6/nd6.h> 125251881Speter#ifdef __FreeBSD__ 126251881Speter#include <netinet6/ip6_var.h> 127251881Speter#include <netinet6/in6_pcb.h> 128251881Speter#endif 129251881Speter#endif /* INET6 */ 130251881Speter 131251881Speter#ifdef __FreeBSD__ 132251881Speter#include <machine/in_cksum.h> 133251881Speter#include <sys/limits.h> 134251881Speter#include <sys/ucred.h> 135251881Speter 136251881Speterextern int ip_optcopy(struct ip *, struct ip *); 137251881Speter#endif 138251881Speter 139251881Speter#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x 140251881Speter 141251881Speter/* 142251881Speter * Global variables 143251881Speter */ 144251881Speter 145251881Speterstruct pf_anchor_global pf_anchors; 146251881Speterstruct pf_ruleset pf_main_ruleset; 147251881Speterstruct pf_altqqueue pf_altqs[2]; 148251881Speterstruct pf_palist pf_pabuf; 149251881Speterstruct pf_altqqueue *pf_altqs_active; 150251881Speterstruct pf_altqqueue *pf_altqs_inactive; 151251881Speterstruct pf_status pf_status; 152251881Speter 153251881Speteru_int32_t ticket_altqs_active; 154251881Speteru_int32_t ticket_altqs_inactive; 155251881Speterint altqs_inactive_open; 156251881Speteru_int32_t ticket_pabuf; 157251881Speter 158251881Speter#ifdef __FreeBSD__ 159251881Speterstruct callout pf_expire_to; /* expire timeout */ 160251881Speter#else 161251881Speterstruct timeout pf_expire_to; /* expire timeout */ 162251881Speter#endif 163251881Speter 164251881Speterstruct pf_anchor_stackframe { 165251881Speter struct pf_ruleset *rs; 166251881Speter struct pf_rule *r; 167251881Speter struct pf_anchor_node *parent; 168251881Speter struct pf_anchor *child; 169251881Speter} pf_anchor_stack[64]; 170251881Speter 171251881Speter#ifdef __FreeBSD__ 172251881Speteruma_zone_t pf_src_tree_pl, pf_rule_pl; 173251881Speteruma_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 174251881Speter#else 175251881Speterstruct pool pf_src_tree_pl, pf_rule_pl; 176251881Speterstruct pool pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 177251881Speter#endif 178251881Speter 179251881Spetervoid pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 180251881Speter 181251881Spetervoid pf_init_threshold(struct pf_threshold *, u_int32_t, 182251881Speter u_int32_t); 183251881Spetervoid pf_add_threshold(struct pf_threshold *); 184251881Speterint pf_check_threshold(struct pf_threshold *); 185251881Speter 186251881Spetervoid pf_change_ap(struct pf_addr *, u_int16_t *, 187251881Speter u_int16_t *, u_int16_t *, struct pf_addr *, 188251881Speter u_int16_t, u_int8_t, sa_family_t); 189251881Speter#ifdef INET6 190251881Spetervoid pf_change_a6(struct pf_addr *, u_int16_t *, 191251881Speter struct pf_addr *, u_int8_t); 192251881Speter#endif /* INET6 */ 193251881Spetervoid pf_change_icmp(struct pf_addr *, u_int16_t *, 194251881Speter struct pf_addr *, struct pf_addr *, u_int16_t, 195251881Speter u_int16_t *, u_int16_t *, u_int16_t *, 196251881Speter u_int16_t *, u_int8_t, sa_family_t); 197251881Speter#ifdef __FreeBSD__ 198251881Spetervoid pf_send_tcp(struct mbuf *, 199251881Speter const struct pf_rule *, sa_family_t, 200251881Speter#else 201251881Spetervoid pf_send_tcp(const struct pf_rule *, sa_family_t, 202251881Speter#endif 203251881Speter const struct pf_addr *, const struct pf_addr *, 204251881Speter u_int16_t, u_int16_t, u_int32_t, u_int32_t, 205251881Speter u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 206251881Speter struct ether_header *, struct ifnet *); 207251881Spetervoid pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 208251881Speter sa_family_t, struct pf_rule *); 209251881Speterstruct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 210251881Speter int, int, struct pfi_kif *, 211251881Speter struct pf_addr *, u_int16_t, struct pf_addr *, 212251881Speter u_int16_t, int); 213251881Speterstruct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 214251881Speter int, int, struct pfi_kif *, struct pf_src_node **, 215251881Speter struct pf_addr *, u_int16_t, 216251881Speter struct pf_addr *, u_int16_t, 217251881Speter struct pf_addr *, u_int16_t *); 218251881Speterint pf_test_tcp(struct pf_rule **, struct pf_state **, 219251881Speter int, struct pfi_kif *, struct mbuf *, int, 220251881Speter void *, struct pf_pdesc *, struct pf_rule **, 221251881Speter#ifdef __FreeBSD__ 222251881Speter struct pf_ruleset **, struct ifqueue *, 223251881Speter struct inpcb *); 224251881Speter#else 225251881Speter struct pf_ruleset **, struct ifqueue *); 226251881Speter#endif 227251881Speterint pf_test_udp(struct pf_rule **, struct pf_state **, 228251881Speter int, struct pfi_kif *, struct mbuf *, int, 229251881Speter void *, struct pf_pdesc *, struct pf_rule **, 230251881Speter#ifdef __FreeBSD__ 231251881Speter struct pf_ruleset **, struct ifqueue *, 232251881Speter struct inpcb *); 233251881Speter#else 234251881Speter struct pf_ruleset **, struct ifqueue *); 235251881Speter#endif 236251881Speterint pf_test_icmp(struct pf_rule **, struct pf_state **, 237251881Speter int, struct pfi_kif *, struct mbuf *, int, 238251881Speter void *, struct pf_pdesc *, struct pf_rule **, 239251881Speter struct pf_ruleset **, struct ifqueue *); 240251881Speterint pf_test_other(struct pf_rule **, struct pf_state **, 241251881Speter int, struct pfi_kif *, struct mbuf *, int, void *, 242251881Speter struct pf_pdesc *, struct pf_rule **, 243251881Speter struct pf_ruleset **, struct ifqueue *); 244251881Speterint pf_test_fragment(struct pf_rule **, int, 245251881Speter struct pfi_kif *, struct mbuf *, void *, 246251881Speter struct pf_pdesc *, struct pf_rule **, 247251881Speter struct pf_ruleset **); 248251881Speterint pf_test_state_tcp(struct pf_state **, int, 249251881Speter struct pfi_kif *, struct mbuf *, int, 250251881Speter void *, struct pf_pdesc *, u_short *); 251251881Speterint pf_test_state_udp(struct pf_state **, int, 252251881Speter struct pfi_kif *, struct mbuf *, int, 253251881Speter void *, struct pf_pdesc *); 254251881Speterint pf_test_state_icmp(struct pf_state **, int, 255251881Speter struct pfi_kif *, struct mbuf *, int, 256251881Speter void *, struct pf_pdesc *, u_short *); 257251881Speterint pf_test_state_other(struct pf_state **, int, 258251881Speter struct pfi_kif *, struct pf_pdesc *); 259251881Speterstruct pf_tag *pf_get_tag(struct mbuf *); 260251881Speterint pf_match_tag(struct mbuf *, struct pf_rule *, 261251881Speter struct pf_tag **, int *); 262251881Spetervoid pf_hash(struct pf_addr *, struct pf_addr *, 263251881Speter struct pf_poolhashkey *, sa_family_t); 264251881Speterint pf_map_addr(u_int8_t, struct pf_rule *, 265251881Speter struct pf_addr *, struct pf_addr *, 266251881Speter struct pf_addr *, struct pf_src_node **); 267251881Speterint pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 268251881Speter struct pf_addr *, struct pf_addr *, u_int16_t, 269251881Speter struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 270251881Speter struct pf_src_node **); 271251881Spetervoid pf_route(struct mbuf **, struct pf_rule *, int, 272251881Speter struct ifnet *, struct pf_state *); 273251881Spetervoid pf_route6(struct mbuf **, struct pf_rule *, int, 274251881Speter struct ifnet *, struct pf_state *); 275251881Speter#ifdef __FreeBSD__ 276251881Speterint pf_socket_lookup(uid_t *, gid_t *, 277251881Speter int, struct pf_pdesc *, struct inpcb *); 278251881Speter#else 279251881Speterint pf_socket_lookup(uid_t *, gid_t *, 280251881Speter int, struct pf_pdesc *); 281251881Speter#endif 282251881Speteru_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 283251881Speter sa_family_t); 284251881Speteru_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 285251881Speter sa_family_t); 286251881Speteru_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 287251881Speter u_int16_t); 288251881Spetervoid pf_set_rt_ifp(struct pf_state *, 289251881Speter struct pf_addr *); 290251881Speterint pf_check_proto_cksum(struct mbuf *, int, int, 291251881Speter u_int8_t, sa_family_t); 292251881Speterint pf_addr_wrap_neq(struct pf_addr_wrap *, 293251881Speter struct pf_addr_wrap *); 294251881Speterstatic int pf_add_mbuf_tag(struct mbuf *, u_int); 295251881Speterstruct pf_state *pf_find_state_recurse(struct pfi_kif *, 296251881Speter struct pf_state *, u_int8_t); 297251881Speterint pf_src_connlimit(struct pf_state **); 298251881Speterint pf_check_congestion(struct ifqueue *); 299251881Speter 300251881Speter#ifdef __FreeBSD__ 301251881Speterint in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 302251881Speter 303251881Speterstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX]; 304251881Speter 305251881Speter#else 306251881Speterstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 307251881Speter { &pf_state_pl, PFSTATE_HIWAT }, 308251881Speter { &pf_src_tree_pl, PFSNODE_HIWAT }, 309251881Speter { &pf_frent_pl, PFFRAG_FRENT_HIWAT } 310251881Speter}; 311251881Speter#endif 312251881Speter 313251881Speter#define STATE_LOOKUP() \ 314251881Speter do { \ 315251881Speter if (direction == PF_IN) \ 316251881Speter *state = pf_find_state_recurse( \ 317251881Speter kif, &key, PF_EXT_GWY); \ 318251881Speter else \ 319251881Speter *state = pf_find_state_recurse( \ 320251881Speter kif, &key, PF_LAN_EXT); \ 321251881Speter if (*state == NULL || (*state)->timeout == PFTM_PURGE) \ 322251881Speter return (PF_DROP); \ 323251881Speter if (direction == PF_OUT && \ 324251881Speter (((*state)->rule.ptr->rt == PF_ROUTETO && \ 325251881Speter (*state)->rule.ptr->direction == PF_OUT) || \ 326251881Speter ((*state)->rule.ptr->rt == PF_REPLYTO && \ 327251881Speter (*state)->rule.ptr->direction == PF_IN)) && \ 328251881Speter (*state)->rt_kif != NULL && \ 329251881Speter (*state)->rt_kif != kif) \ 330251881Speter return (PF_PASS); \ 331251881Speter } while (0) 332251881Speter 333251881Speter#define STATE_TRANSLATE(s) \ 334251881Speter (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ 335251881Speter ((s)->af == AF_INET6 && \ 336251881Speter ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ 337251881Speter (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ 338251881Speter (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ 339251881Speter (s)->lan.port != (s)->gwy.port 340251881Speter 341251881Speter#define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) : \ 342251881Speter ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent : \ 343251881Speter (k)->pfik_parent->pfik_parent) 344251881Speter 345251881Speter#define STATE_INC_COUNTERS(s) \ 346251881Speter do { \ 347251881Speter s->rule.ptr->states++; \ 348251881Speter if (s->anchor.ptr != NULL) \ 349251881Speter s->anchor.ptr->states++; \ 350251881Speter if (s->nat_rule.ptr != NULL) \ 351251881Speter s->nat_rule.ptr->states++; \ 352251881Speter } while (0) 353251881Speter 354251881Speter#define STATE_DEC_COUNTERS(s) \ 355251881Speter do { \ 356251881Speter if (s->nat_rule.ptr != NULL) \ 357251881Speter s->nat_rule.ptr->states--; \ 358251881Speter if (s->anchor.ptr != NULL) \ 359251881Speter s->anchor.ptr->states--; \ 360251881Speter s->rule.ptr->states--; \ 361251881Speter } while (0) 362251881Speter 363251881Speter#ifndef __FreeBSD__ 364251881Speterstatic __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 365251881Speterstatic __inline int pf_state_compare_lan_ext(struct pf_state *, 366251881Speter struct pf_state *); 367251881Speterstatic __inline int pf_state_compare_ext_gwy(struct pf_state *, 368251881Speter struct pf_state *); 369251881Speterstatic __inline int pf_state_compare_id(struct pf_state *, 370251881Speter struct pf_state *); 371251881Speterstatic __inline int pf_anchor_compare(struct pf_anchor *, struct pf_anchor *); 372251881Speter#else 373251881Speterstatic int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 374251881Speterstatic int pf_state_compare_lan_ext(struct pf_state *, 375251881Speter struct pf_state *); 376251881Speterstatic int pf_state_compare_ext_gwy(struct pf_state *, 377251881Speter struct pf_state *); 378251881Speterstatic int pf_state_compare_id(struct pf_state *, 379251881Speter struct pf_state *); 380251881Speterstatic int pf_anchor_compare(struct pf_anchor *, struct pf_anchor *); 381251881Speter#endif 382251881Speter 383251881Speterstruct pf_src_tree tree_src_tracking; 384251881Speter 385251881Speterstruct pf_state_tree_id tree_id; 386251881Speterstruct pf_state_queue state_updates; 387251881Speter 388251881SpeterRB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 389251881SpeterRB_GENERATE(pf_state_tree_lan_ext, pf_state, 390251881Speter u.s.entry_lan_ext, pf_state_compare_lan_ext); 391251881SpeterRB_GENERATE(pf_state_tree_ext_gwy, pf_state, 392251881Speter u.s.entry_ext_gwy, pf_state_compare_ext_gwy); 393251881SpeterRB_GENERATE(pf_state_tree_id, pf_state, 394251881Speter u.s.entry_id, pf_state_compare_id); 395251881SpeterRB_GENERATE(pf_anchor_global, pf_anchor, entry_global, pf_anchor_compare); 396251881SpeterRB_GENERATE(pf_anchor_node, pf_anchor, entry_node, pf_anchor_compare); 397251881Speter 398251881Speter#ifdef __FreeBSD__ 399251881Speterstatic int 400251881Speter#else 401251881Speterstatic __inline int 402251881Speter#endif 403251881Speterpf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 404251881Speter{ 405251881Speter int diff; 406251881Speter 407251881Speter if (a->rule.ptr > b->rule.ptr) 408251881Speter return (1); 409251881Speter if (a->rule.ptr < b->rule.ptr) 410251881Speter return (-1); 411251881Speter if ((diff = a->af - b->af) != 0) 412251881Speter return (diff); 413251881Speter switch (a->af) { 414251881Speter#ifdef INET 415251881Speter case AF_INET: 416251881Speter if (a->addr.addr32[0] > b->addr.addr32[0]) 417 return (1); 418 if (a->addr.addr32[0] < b->addr.addr32[0]) 419 return (-1); 420 break; 421#endif /* INET */ 422#ifdef INET6 423 case AF_INET6: 424 if (a->addr.addr32[3] > b->addr.addr32[3]) 425 return (1); 426 if (a->addr.addr32[3] < b->addr.addr32[3]) 427 return (-1); 428 if (a->addr.addr32[2] > b->addr.addr32[2]) 429 return (1); 430 if (a->addr.addr32[2] < b->addr.addr32[2]) 431 return (-1); 432 if (a->addr.addr32[1] > b->addr.addr32[1]) 433 return (1); 434 if (a->addr.addr32[1] < b->addr.addr32[1]) 435 return (-1); 436 if (a->addr.addr32[0] > b->addr.addr32[0]) 437 return (1); 438 if (a->addr.addr32[0] < b->addr.addr32[0]) 439 return (-1); 440 break; 441#endif /* INET6 */ 442 } 443 return (0); 444} 445 446#ifdef __FreeBSD__ 447static int 448#else 449static __inline int 450#endif 451pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b) 452{ 453 int diff; 454 455 if ((diff = a->proto - b->proto) != 0) 456 return (diff); 457 if ((diff = a->af - b->af) != 0) 458 return (diff); 459 switch (a->af) { 460#ifdef INET 461 case AF_INET: 462 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 463 return (1); 464 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 465 return (-1); 466 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 467 return (1); 468 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 469 return (-1); 470 break; 471#endif /* INET */ 472#ifdef INET6 473 case AF_INET6: 474 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 475 return (1); 476 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 477 return (-1); 478 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 479 return (1); 480 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 481 return (-1); 482 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 483 return (1); 484 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 485 return (-1); 486 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 487 return (1); 488 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 489 return (-1); 490 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 491 return (1); 492 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 493 return (-1); 494 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 495 return (1); 496 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 497 return (-1); 498 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 499 return (1); 500 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 501 return (-1); 502 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 503 return (1); 504 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 505 return (-1); 506 break; 507#endif /* INET6 */ 508 } 509 510 if ((diff = a->lan.port - b->lan.port) != 0) 511 return (diff); 512 if ((diff = a->ext.port - b->ext.port) != 0) 513 return (diff); 514 515 return (0); 516} 517 518#ifdef __FreeBSD__ 519static int 520#else 521static __inline int 522#endif 523pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b) 524{ 525 int diff; 526 527 if ((diff = a->proto - b->proto) != 0) 528 return (diff); 529 if ((diff = a->af - b->af) != 0) 530 return (diff); 531 switch (a->af) { 532#ifdef INET 533 case AF_INET: 534 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 535 return (1); 536 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 537 return (-1); 538 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 539 return (1); 540 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 541 return (-1); 542 break; 543#endif /* INET */ 544#ifdef INET6 545 case AF_INET6: 546 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 547 return (1); 548 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 549 return (-1); 550 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 551 return (1); 552 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 553 return (-1); 554 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 555 return (1); 556 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 557 return (-1); 558 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 559 return (1); 560 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 561 return (-1); 562 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 563 return (1); 564 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 565 return (-1); 566 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 567 return (1); 568 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 569 return (-1); 570 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 571 return (1); 572 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 573 return (-1); 574 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 575 return (1); 576 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 577 return (-1); 578 break; 579#endif /* INET6 */ 580 } 581 582 if ((diff = a->ext.port - b->ext.port) != 0) 583 return (diff); 584 if ((diff = a->gwy.port - b->gwy.port) != 0) 585 return (diff); 586 587 return (0); 588} 589 590#ifdef __FreeBSD__ 591static int 592#else 593static __inline int 594#endif 595pf_state_compare_id(struct pf_state *a, struct pf_state *b) 596{ 597 if (a->id > b->id) 598 return (1); 599 if (a->id < b->id) 600 return (-1); 601 if (a->creatorid > b->creatorid) 602 return (1); 603 if (a->creatorid < b->creatorid) 604 return (-1); 605 606 return (0); 607} 608 609#ifdef __FreeBSD__ 610static int 611#else 612static __inline int 613#endif 614pf_anchor_compare(struct pf_anchor *a, struct pf_anchor *b) 615{ 616 int c = strcmp(a->path, b->path); 617 618 return (c ? (c < 0 ? -1 : 1) : 0); 619} 620 621#ifdef INET6 622void 623pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 624{ 625 switch (af) { 626#ifdef INET 627 case AF_INET: 628 dst->addr32[0] = src->addr32[0]; 629 break; 630#endif /* INET */ 631 case AF_INET6: 632 dst->addr32[0] = src->addr32[0]; 633 dst->addr32[1] = src->addr32[1]; 634 dst->addr32[2] = src->addr32[2]; 635 dst->addr32[3] = src->addr32[3]; 636 break; 637 } 638} 639#endif /* INET6 */ 640 641struct pf_state * 642pf_find_state_byid(struct pf_state *key) 643{ 644 pf_status.fcounters[FCNT_STATE_SEARCH]++; 645 return (RB_FIND(pf_state_tree_id, &tree_id, key)); 646} 647 648struct pf_state * 649pf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree) 650{ 651 struct pf_state *s; 652 653 pf_status.fcounters[FCNT_STATE_SEARCH]++; 654 655 switch (tree) { 656 case PF_LAN_EXT: 657 for (; kif != NULL; kif = kif->pfik_parent) { 658 s = RB_FIND(pf_state_tree_lan_ext, 659 &kif->pfik_lan_ext, key); 660 if (s != NULL) 661 return (s); 662 } 663 return (NULL); 664 case PF_EXT_GWY: 665 for (; kif != NULL; kif = kif->pfik_parent) { 666 s = RB_FIND(pf_state_tree_ext_gwy, 667 &kif->pfik_ext_gwy, key); 668 if (s != NULL) 669 return (s); 670 } 671 return (NULL); 672 default: 673 panic("pf_find_state_recurse"); 674 } 675} 676 677struct pf_state * 678pf_find_state_all(struct pf_state *key, u_int8_t tree, int *more) 679{ 680 struct pf_state *s, *ss = NULL; 681 struct pfi_kif *kif; 682 683 pf_status.fcounters[FCNT_STATE_SEARCH]++; 684 685 switch (tree) { 686 case PF_LAN_EXT: 687 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 688 s = RB_FIND(pf_state_tree_lan_ext, 689 &kif->pfik_lan_ext, key); 690 if (s == NULL) 691 continue; 692 if (more == NULL) 693 return (s); 694 ss = s; 695 (*more)++; 696 } 697 return (ss); 698 case PF_EXT_GWY: 699 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 700 s = RB_FIND(pf_state_tree_ext_gwy, 701 &kif->pfik_ext_gwy, key); 702 if (s == NULL) 703 continue; 704 if (more == NULL) 705 return (s); 706 ss = s; 707 (*more)++; 708 } 709 return (ss); 710 default: 711 panic("pf_find_state_all"); 712 } 713} 714 715void 716pf_init_threshold(struct pf_threshold *threshold, 717 u_int32_t limit, u_int32_t seconds) 718{ 719 threshold->limit = limit * PF_THRESHOLD_MULT; 720 threshold->seconds = seconds; 721 threshold->count = 0; 722 threshold->last = time_second; 723} 724 725void 726pf_add_threshold(struct pf_threshold *threshold) 727{ 728 u_int32_t t = time_second, diff = t - threshold->last; 729 730 if (diff >= threshold->seconds) 731 threshold->count = 0; 732 else 733 threshold->count -= threshold->count * diff / 734 threshold->seconds; 735 threshold->count += PF_THRESHOLD_MULT; 736 threshold->last = t; 737} 738 739int 740pf_check_threshold(struct pf_threshold *threshold) 741{ 742 return (threshold->count > threshold->limit); 743} 744 745int 746pf_src_connlimit(struct pf_state **state) 747{ 748 struct pf_state *s; 749 int bad = 0; 750 751 (*state)->src_node->conn++; 752#ifdef __FreeBSD__ 753 (*state)->local_flags |= PFSTATE_SRC_CONN; 754#endif 755 pf_add_threshold(&(*state)->src_node->conn_rate); 756 757 if ((*state)->rule.ptr->max_src_conn && 758 (*state)->rule.ptr->max_src_conn < 759 (*state)->src_node->conn) { 760 pf_status.lcounters[LCNT_SRCCONN]++; 761 bad++; 762 } 763 764 if ((*state)->rule.ptr->max_src_conn_rate.limit && 765 pf_check_threshold(&(*state)->src_node->conn_rate)) { 766 pf_status.lcounters[LCNT_SRCCONNRATE]++; 767 bad++; 768 } 769 770 if (!bad) 771 return (0); 772 773 if ((*state)->rule.ptr->overload_tbl) { 774 struct pfr_addr p; 775 u_int32_t killed = 0; 776 777 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 778 if (pf_status.debug >= PF_DEBUG_MISC) { 779 printf("pf_src_connlimit: blocking address "); 780 pf_print_host(&(*state)->src_node->addr, 0, 781 (*state)->af); 782 } 783 784 bzero(&p, sizeof(p)); 785 p.pfra_af = (*state)->af; 786 switch ((*state)->af) { 787#ifdef INET 788 case AF_INET: 789 p.pfra_net = 32; 790 p.pfra_ip4addr = (*state)->src_node->addr.v4; 791 break; 792#endif /* INET */ 793#ifdef INET6 794 case AF_INET6: 795 p.pfra_net = 128; 796 p.pfra_ip6addr = (*state)->src_node->addr.v6; 797 break; 798#endif /* INET6 */ 799 } 800 801 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 802 &p, time_second); 803 804 /* kill existing states if that's required. */ 805 if ((*state)->rule.ptr->flush) { 806 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 807 808 RB_FOREACH(s, pf_state_tree_id, &tree_id) { 809 /* 810 * Kill states from this source. (Only those 811 * from the same rule if PF_FLUSH_GLOBAL is not 812 * set) 813 */ 814 if (s->af == (*state)->af && 815 (((*state)->direction == PF_OUT && 816 PF_AEQ(&(*state)->src_node->addr, 817 &s->lan.addr, s->af)) || 818 ((*state)->direction == PF_IN && 819 PF_AEQ(&(*state)->src_node->addr, 820 &s->ext.addr, s->af))) && 821 ((*state)->rule.ptr->flush & 822 PF_FLUSH_GLOBAL || 823 (*state)->rule.ptr == s->rule.ptr)) { 824 s->timeout = PFTM_PURGE; 825 s->src.state = s->dst.state = 826 TCPS_CLOSED; 827 killed++; 828 } 829 } 830 if (pf_status.debug >= PF_DEBUG_MISC) 831 printf(", %u states killed", killed); 832 } 833 if (pf_status.debug >= PF_DEBUG_MISC) 834 printf("\n"); 835 } 836 837 /* kill this state */ 838 (*state)->timeout = PFTM_PURGE; 839 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 840 return (1); 841} 842 843int 844pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 845 struct pf_addr *src, sa_family_t af) 846{ 847 struct pf_src_node k; 848 849 if (*sn == NULL) { 850 k.af = af; 851 PF_ACPY(&k.addr, src, af); 852 if (rule->rule_flag & PFRULE_RULESRCTRACK || 853 rule->rpool.opts & PF_POOL_STICKYADDR) 854 k.rule.ptr = rule; 855 else 856 k.rule.ptr = NULL; 857 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 858 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 859 } 860 if (*sn == NULL) { 861 if (!rule->max_src_nodes || 862 rule->src_nodes < rule->max_src_nodes) 863 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 864 else 865 pf_status.lcounters[LCNT_SRCNODES]++; 866 if ((*sn) == NULL) 867 return (-1); 868 bzero(*sn, sizeof(struct pf_src_node)); 869 870 pf_init_threshold(&(*sn)->conn_rate, 871 rule->max_src_conn_rate.limit, 872 rule->max_src_conn_rate.seconds); 873 874 (*sn)->af = af; 875 if (rule->rule_flag & PFRULE_RULESRCTRACK || 876 rule->rpool.opts & PF_POOL_STICKYADDR) 877 (*sn)->rule.ptr = rule; 878 else 879 (*sn)->rule.ptr = NULL; 880 PF_ACPY(&(*sn)->addr, src, af); 881 if (RB_INSERT(pf_src_tree, 882 &tree_src_tracking, *sn) != NULL) { 883 if (pf_status.debug >= PF_DEBUG_MISC) { 884 printf("pf: src_tree insert failed: "); 885 pf_print_host(&(*sn)->addr, 0, af); 886 printf("\n"); 887 } 888 pool_put(&pf_src_tree_pl, *sn); 889 return (-1); 890 } 891 (*sn)->creation = time_second; 892 (*sn)->ruletype = rule->action; 893 if ((*sn)->rule.ptr != NULL) 894 (*sn)->rule.ptr->src_nodes++; 895 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 896 pf_status.src_nodes++; 897 } else { 898 if (rule->max_src_states && 899 (*sn)->states >= rule->max_src_states) { 900 pf_status.lcounters[LCNT_SRCSTATES]++; 901 return (-1); 902 } 903 } 904 return (0); 905} 906 907int 908pf_insert_state(struct pfi_kif *kif, struct pf_state *state) 909{ 910 /* Thou MUST NOT insert multiple duplicate keys */ 911 state->u.s.kif = kif; 912 if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) { 913 if (pf_status.debug >= PF_DEBUG_MISC) { 914 printf("pf: state insert failed: tree_lan_ext"); 915 printf(" lan: "); 916 pf_print_host(&state->lan.addr, state->lan.port, 917 state->af); 918 printf(" gwy: "); 919 pf_print_host(&state->gwy.addr, state->gwy.port, 920 state->af); 921 printf(" ext: "); 922 pf_print_host(&state->ext.addr, state->ext.port, 923 state->af); 924 if (state->sync_flags & PFSTATE_FROMSYNC) 925 printf(" (from sync)"); 926 printf("\n"); 927 } 928 return (-1); 929 } 930 931 if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) { 932 if (pf_status.debug >= PF_DEBUG_MISC) { 933 printf("pf: state insert failed: tree_ext_gwy"); 934 printf(" lan: "); 935 pf_print_host(&state->lan.addr, state->lan.port, 936 state->af); 937 printf(" gwy: "); 938 pf_print_host(&state->gwy.addr, state->gwy.port, 939 state->af); 940 printf(" ext: "); 941 pf_print_host(&state->ext.addr, state->ext.port, 942 state->af); 943 if (state->sync_flags & PFSTATE_FROMSYNC) 944 printf(" (from sync)"); 945 printf("\n"); 946 } 947 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 948 return (-1); 949 } 950 951 if (state->id == 0 && state->creatorid == 0) { 952 state->id = htobe64(pf_status.stateid++); 953 state->creatorid = pf_status.hostid; 954 } 955 if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) { 956 if (pf_status.debug >= PF_DEBUG_MISC) { 957#ifdef __FreeBSD__ 958 printf("pf: state insert failed: " 959 "id: %016llx creatorid: %08x", 960 (long long)be64toh(state->id), 961 ntohl(state->creatorid)); 962#else 963 printf("pf: state insert failed: " 964 "id: %016llx creatorid: %08x", 965 betoh64(state->id), ntohl(state->creatorid)); 966#endif 967 if (state->sync_flags & PFSTATE_FROMSYNC) 968 printf(" (from sync)"); 969 printf("\n"); 970 } 971 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 972 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state); 973 return (-1); 974 } 975 TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates); 976 977 pf_status.fcounters[FCNT_STATE_INSERT]++; 978 pf_status.states++; 979 pfi_attach_state(kif); 980#if NPFSYNC 981 pfsync_insert_state(state); 982#endif 983 return (0); 984} 985 986void 987pf_purge_timeout(void *arg) 988{ 989#ifdef __FreeBSD__ 990 struct callout *to = arg; 991#else 992 struct timeout *to = arg; 993#endif 994 int s; 995 996#ifdef __FreeBSD__ 997 PF_LOCK(); 998#endif 999 s = splsoftnet(); 1000 pf_purge_expired_states(); 1001 pf_purge_expired_fragments(); 1002 pf_purge_expired_src_nodes(); 1003 splx(s); 1004#ifdef __FreeBSD__ 1005 PF_UNLOCK(); 1006#endif 1007 1008#ifdef __FreeBSD__ 1009 callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz, 1010 pf_purge_timeout, to); 1011#else 1012 timeout_add(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz); 1013#endif 1014} 1015 1016u_int32_t 1017pf_state_expires(const struct pf_state *state) 1018{ 1019 u_int32_t timeout; 1020 u_int32_t start; 1021 u_int32_t end; 1022 u_int32_t states; 1023 1024 /* handle all PFTM_* > PFTM_MAX here */ 1025 if (state->timeout == PFTM_PURGE) 1026 return (time_second); 1027 if (state->timeout == PFTM_UNTIL_PACKET) 1028 return (0); 1029#ifdef __FreeBSD__ 1030 KASSERT((state->timeout < PFTM_MAX), 1031 ("pf_state_expires: timeout > PFTM_MAX")); 1032#else 1033 KASSERT(state->timeout < PFTM_MAX); 1034#endif 1035 timeout = state->rule.ptr->timeout[state->timeout]; 1036 if (!timeout) 1037 timeout = pf_default_rule.timeout[state->timeout]; 1038 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1039 if (start) { 1040 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1041 states = state->rule.ptr->states; 1042 } else { 1043 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1044 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1045 states = pf_status.states; 1046 } 1047 if (end && states > start && start < end) { 1048 if (states < end) 1049 return (state->expire + timeout * (end - states) / 1050 (end - start)); 1051 else 1052 return (time_second); 1053 } 1054 return (state->expire + timeout); 1055} 1056 1057void 1058pf_purge_expired_src_nodes(void) 1059{ 1060 struct pf_src_node *cur, *next; 1061 1062 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1063 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1064 1065 if (cur->states <= 0 && cur->expire <= time_second) { 1066 if (cur->rule.ptr != NULL) { 1067 cur->rule.ptr->src_nodes--; 1068 if (cur->rule.ptr->states <= 0 && 1069 cur->rule.ptr->max_src_nodes <= 0) 1070 pf_rm_rule(NULL, cur->rule.ptr); 1071 } 1072 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1073 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1074 pf_status.src_nodes--; 1075 pool_put(&pf_src_tree_pl, cur); 1076 } 1077 } 1078} 1079 1080void 1081pf_src_tree_remove_state(struct pf_state *s) 1082{ 1083 u_int32_t timeout; 1084 1085 if (s->src_node != NULL) { 1086 if (s->proto == IPPROTO_TCP) { 1087#ifdef __FreeBSD__ 1088 if (s->local_flags & PFSTATE_SRC_CONN) 1089#else 1090 if (s->src.state == PF_TCPS_PROXY_DST || 1091 s->timeout >= PFTM_TCP_ESTABLISHED) 1092#endif 1093 --s->src_node->conn; 1094 } 1095 if (--s->src_node->states <= 0) { 1096 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1097 if (!timeout) 1098 timeout = 1099 pf_default_rule.timeout[PFTM_SRC_NODE]; 1100 s->src_node->expire = time_second + timeout; 1101 } 1102 } 1103 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1104 if (--s->nat_src_node->states <= 0) { 1105 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1106 if (!timeout) 1107 timeout = 1108 pf_default_rule.timeout[PFTM_SRC_NODE]; 1109 s->nat_src_node->expire = time_second + timeout; 1110 } 1111 } 1112 s->src_node = s->nat_src_node = NULL; 1113} 1114 1115void 1116pf_purge_expired_state(struct pf_state *cur) 1117{ 1118#ifdef __FreeBSD__ 1119 if (cur->local_flags & PFSTATE_EXPIRING) 1120 return; 1121 cur->local_flags |= PFSTATE_EXPIRING; 1122#endif 1123 if (cur->src.state == PF_TCPS_PROXY_DST) 1124#ifdef __FreeBSD__ 1125 pf_send_tcp(NULL, cur->rule.ptr, cur->af, 1126#else 1127 pf_send_tcp(cur->rule.ptr, cur->af, 1128#endif 1129 &cur->ext.addr, &cur->lan.addr, 1130 cur->ext.port, cur->lan.port, 1131 cur->src.seqhi, cur->src.seqlo + 1, 1132 TH_RST|TH_ACK, 0, 0, 0, 1, NULL, NULL); 1133 RB_REMOVE(pf_state_tree_ext_gwy, 1134 &cur->u.s.kif->pfik_ext_gwy, cur); 1135 RB_REMOVE(pf_state_tree_lan_ext, 1136 &cur->u.s.kif->pfik_lan_ext, cur); 1137 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1138#if NPFSYNC 1139 pfsync_delete_state(cur); 1140#endif 1141 pf_src_tree_remove_state(cur); 1142 if (--cur->rule.ptr->states <= 0 && 1143 cur->rule.ptr->src_nodes <= 0) 1144 pf_rm_rule(NULL, cur->rule.ptr); 1145 if (cur->nat_rule.ptr != NULL) 1146 if (--cur->nat_rule.ptr->states <= 0 && 1147 cur->nat_rule.ptr->src_nodes <= 0) 1148 pf_rm_rule(NULL, cur->nat_rule.ptr); 1149 if (cur->anchor.ptr != NULL) 1150 if (--cur->anchor.ptr->states <= 0) 1151 pf_rm_rule(NULL, cur->anchor.ptr); 1152 pf_normalize_tcp_cleanup(cur); 1153 pfi_detach_state(cur->u.s.kif); 1154 TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates); 1155 if (cur->tag) 1156 pf_tag_unref(cur->tag); 1157 pool_put(&pf_state_pl, cur); 1158 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1159 pf_status.states--; 1160} 1161 1162void 1163pf_purge_expired_states(void) 1164{ 1165 struct pf_state *cur, *next; 1166 1167 for (cur = RB_MIN(pf_state_tree_id, &tree_id); 1168 cur; cur = next) { 1169 next = RB_NEXT(pf_state_tree_id, &tree_id, cur); 1170 if (pf_state_expires(cur) <= time_second) 1171 pf_purge_expired_state(cur); 1172 } 1173} 1174 1175int 1176pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1177{ 1178 if (aw->type != PF_ADDR_TABLE) 1179 return (0); 1180 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1181 return (1); 1182 return (0); 1183} 1184 1185void 1186pf_tbladdr_remove(struct pf_addr_wrap *aw) 1187{ 1188 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1189 return; 1190 pfr_detach_table(aw->p.tbl); 1191 aw->p.tbl = NULL; 1192} 1193 1194void 1195pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1196{ 1197 struct pfr_ktable *kt = aw->p.tbl; 1198 1199 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1200 return; 1201 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1202 kt = kt->pfrkt_root; 1203 aw->p.tbl = NULL; 1204 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1205 kt->pfrkt_cnt : -1; 1206} 1207 1208void 1209pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1210{ 1211 switch (af) { 1212#ifdef INET 1213 case AF_INET: { 1214 u_int32_t a = ntohl(addr->addr32[0]); 1215 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1216 (a>>8)&255, a&255); 1217 if (p) { 1218 p = ntohs(p); 1219 printf(":%u", p); 1220 } 1221 break; 1222 } 1223#endif /* INET */ 1224#ifdef INET6 1225 case AF_INET6: { 1226 u_int16_t b; 1227 u_int8_t i, curstart = 255, curend = 0, 1228 maxstart = 0, maxend = 0; 1229 for (i = 0; i < 8; i++) { 1230 if (!addr->addr16[i]) { 1231 if (curstart == 255) 1232 curstart = i; 1233 else 1234 curend = i; 1235 } else { 1236 if (curstart) { 1237 if ((curend - curstart) > 1238 (maxend - maxstart)) { 1239 maxstart = curstart; 1240 maxend = curend; 1241 curstart = 255; 1242 } 1243 } 1244 } 1245 } 1246 for (i = 0; i < 8; i++) { 1247 if (i >= maxstart && i <= maxend) { 1248 if (maxend != 7) { 1249 if (i == maxstart) 1250 printf(":"); 1251 } else { 1252 if (i == maxend) 1253 printf(":"); 1254 } 1255 } else { 1256 b = ntohs(addr->addr16[i]); 1257 printf("%x", b); 1258 if (i < 7) 1259 printf(":"); 1260 } 1261 } 1262 if (p) { 1263 p = ntohs(p); 1264 printf("[%u]", p); 1265 } 1266 break; 1267 } 1268#endif /* INET6 */ 1269 } 1270} 1271 1272void 1273pf_print_state(struct pf_state *s) 1274{ 1275 switch (s->proto) { 1276 case IPPROTO_TCP: 1277 printf("TCP "); 1278 break; 1279 case IPPROTO_UDP: 1280 printf("UDP "); 1281 break; 1282 case IPPROTO_ICMP: 1283 printf("ICMP "); 1284 break; 1285 case IPPROTO_ICMPV6: 1286 printf("ICMPV6 "); 1287 break; 1288 default: 1289 printf("%u ", s->proto); 1290 break; 1291 } 1292 pf_print_host(&s->lan.addr, s->lan.port, s->af); 1293 printf(" "); 1294 pf_print_host(&s->gwy.addr, s->gwy.port, s->af); 1295 printf(" "); 1296 pf_print_host(&s->ext.addr, s->ext.port, s->af); 1297 printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1298 s->src.seqhi, s->src.max_win, s->src.seqdiff); 1299 if (s->src.wscale && s->dst.wscale) 1300 printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1301 printf("]"); 1302 printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1303 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1304 if (s->src.wscale && s->dst.wscale) 1305 printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1306 printf("]"); 1307 printf(" %u:%u", s->src.state, s->dst.state); 1308} 1309 1310void 1311pf_print_flags(u_int8_t f) 1312{ 1313 if (f) 1314 printf(" "); 1315 if (f & TH_FIN) 1316 printf("F"); 1317 if (f & TH_SYN) 1318 printf("S"); 1319 if (f & TH_RST) 1320 printf("R"); 1321 if (f & TH_PUSH) 1322 printf("P"); 1323 if (f & TH_ACK) 1324 printf("A"); 1325 if (f & TH_URG) 1326 printf("U"); 1327 if (f & TH_ECE) 1328 printf("E"); 1329 if (f & TH_CWR) 1330 printf("W"); 1331} 1332 1333#define PF_SET_SKIP_STEPS(i) \ 1334 do { \ 1335 while (head[i] != cur) { \ 1336 head[i]->skip[i].ptr = cur; \ 1337 head[i] = TAILQ_NEXT(head[i], entries); \ 1338 } \ 1339 } while (0) 1340 1341void 1342pf_calc_skip_steps(struct pf_rulequeue *rules) 1343{ 1344 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1345 int i; 1346 1347 cur = TAILQ_FIRST(rules); 1348 prev = cur; 1349 for (i = 0; i < PF_SKIP_COUNT; ++i) 1350 head[i] = cur; 1351 while (cur != NULL) { 1352 1353 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1354 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1355 if (cur->direction != prev->direction) 1356 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1357 if (cur->af != prev->af) 1358 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1359 if (cur->proto != prev->proto) 1360 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1361 if (cur->src.neg != prev->src.neg || 1362 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1363 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1364 if (cur->src.port[0] != prev->src.port[0] || 1365 cur->src.port[1] != prev->src.port[1] || 1366 cur->src.port_op != prev->src.port_op) 1367 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1368 if (cur->dst.neg != prev->dst.neg || 1369 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1370 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1371 if (cur->dst.port[0] != prev->dst.port[0] || 1372 cur->dst.port[1] != prev->dst.port[1] || 1373 cur->dst.port_op != prev->dst.port_op) 1374 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1375 1376 prev = cur; 1377 cur = TAILQ_NEXT(cur, entries); 1378 } 1379 for (i = 0; i < PF_SKIP_COUNT; ++i) 1380 PF_SET_SKIP_STEPS(i); 1381} 1382 1383int 1384pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1385{ 1386 if (aw1->type != aw2->type) 1387 return (1); 1388 switch (aw1->type) { 1389 case PF_ADDR_ADDRMASK: 1390 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1391 return (1); 1392 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1393 return (1); 1394 return (0); 1395 case PF_ADDR_DYNIFTL: 1396 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1397 case PF_ADDR_NOROUTE: 1398 return (0); 1399 case PF_ADDR_TABLE: 1400 return (aw1->p.tbl != aw2->p.tbl); 1401 default: 1402 printf("invalid address type: %d\n", aw1->type); 1403 return (1); 1404 } 1405} 1406 1407u_int16_t 1408pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1409{ 1410 u_int32_t l; 1411 1412 if (udp && !cksum) 1413 return (0x0000); 1414 l = cksum + old - new; 1415 l = (l >> 16) + (l & 65535); 1416 l = l & 65535; 1417 if (udp && !l) 1418 return (0xFFFF); 1419 return (l); 1420} 1421 1422void 1423pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1424 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1425{ 1426 struct pf_addr ao; 1427 u_int16_t po = *p; 1428 1429 PF_ACPY(&ao, a, af); 1430 PF_ACPY(a, an, af); 1431 1432 *p = pn; 1433 1434 switch (af) { 1435#ifdef INET 1436 case AF_INET: 1437 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1438 ao.addr16[0], an->addr16[0], 0), 1439 ao.addr16[1], an->addr16[1], 0); 1440 *p = pn; 1441 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1442 ao.addr16[0], an->addr16[0], u), 1443 ao.addr16[1], an->addr16[1], u), 1444 po, pn, u); 1445 break; 1446#endif /* INET */ 1447#ifdef INET6 1448 case AF_INET6: 1449 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1450 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1451 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1452 ao.addr16[0], an->addr16[0], u), 1453 ao.addr16[1], an->addr16[1], u), 1454 ao.addr16[2], an->addr16[2], u), 1455 ao.addr16[3], an->addr16[3], u), 1456 ao.addr16[4], an->addr16[4], u), 1457 ao.addr16[5], an->addr16[5], u), 1458 ao.addr16[6], an->addr16[6], u), 1459 ao.addr16[7], an->addr16[7], u), 1460 po, pn, u); 1461 break; 1462#endif /* INET6 */ 1463 } 1464} 1465 1466 1467/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1468void 1469pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1470{ 1471 u_int32_t ao; 1472 1473 memcpy(&ao, a, sizeof(ao)); 1474 memcpy(a, &an, sizeof(u_int32_t)); 1475 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1476 ao % 65536, an % 65536, u); 1477} 1478 1479#ifdef INET6 1480void 1481pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1482{ 1483 struct pf_addr ao; 1484 1485 PF_ACPY(&ao, a, AF_INET6); 1486 PF_ACPY(a, an, AF_INET6); 1487 1488 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1489 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1490 pf_cksum_fixup(pf_cksum_fixup(*c, 1491 ao.addr16[0], an->addr16[0], u), 1492 ao.addr16[1], an->addr16[1], u), 1493 ao.addr16[2], an->addr16[2], u), 1494 ao.addr16[3], an->addr16[3], u), 1495 ao.addr16[4], an->addr16[4], u), 1496 ao.addr16[5], an->addr16[5], u), 1497 ao.addr16[6], an->addr16[6], u), 1498 ao.addr16[7], an->addr16[7], u); 1499} 1500#endif /* INET6 */ 1501 1502void 1503pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1504 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1505 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1506{ 1507 struct pf_addr oia, ooa; 1508 1509 PF_ACPY(&oia, ia, af); 1510 PF_ACPY(&ooa, oa, af); 1511 1512 /* Change inner protocol port, fix inner protocol checksum. */ 1513 if (ip != NULL) { 1514 u_int16_t oip = *ip; 1515 u_int32_t opc = 0; /* make the compiler happy */ 1516 1517 if (pc != NULL) 1518 opc = *pc; 1519 *ip = np; 1520 if (pc != NULL) 1521 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1522 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1523 if (pc != NULL) 1524 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1525 } 1526 /* Change inner ip address, fix inner ip and icmp checksums. */ 1527 PF_ACPY(ia, na, af); 1528 switch (af) { 1529#ifdef INET 1530 case AF_INET: { 1531 u_int32_t oh2c = *h2c; 1532 1533 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1534 oia.addr16[0], ia->addr16[0], 0), 1535 oia.addr16[1], ia->addr16[1], 0); 1536 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1537 oia.addr16[0], ia->addr16[0], 0), 1538 oia.addr16[1], ia->addr16[1], 0); 1539 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1540 break; 1541 } 1542#endif /* INET */ 1543#ifdef INET6 1544 case AF_INET6: 1545 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1546 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1547 pf_cksum_fixup(pf_cksum_fixup(*ic, 1548 oia.addr16[0], ia->addr16[0], u), 1549 oia.addr16[1], ia->addr16[1], u), 1550 oia.addr16[2], ia->addr16[2], u), 1551 oia.addr16[3], ia->addr16[3], u), 1552 oia.addr16[4], ia->addr16[4], u), 1553 oia.addr16[5], ia->addr16[5], u), 1554 oia.addr16[6], ia->addr16[6], u), 1555 oia.addr16[7], ia->addr16[7], u); 1556 break; 1557#endif /* INET6 */ 1558 } 1559 /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1560 PF_ACPY(oa, na, af); 1561 switch (af) { 1562#ifdef INET 1563 case AF_INET: 1564 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1565 ooa.addr16[0], oa->addr16[0], 0), 1566 ooa.addr16[1], oa->addr16[1], 0); 1567 break; 1568#endif /* INET */ 1569#ifdef INET6 1570 case AF_INET6: 1571 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1572 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1573 pf_cksum_fixup(pf_cksum_fixup(*ic, 1574 ooa.addr16[0], oa->addr16[0], u), 1575 ooa.addr16[1], oa->addr16[1], u), 1576 ooa.addr16[2], oa->addr16[2], u), 1577 ooa.addr16[3], oa->addr16[3], u), 1578 ooa.addr16[4], oa->addr16[4], u), 1579 ooa.addr16[5], oa->addr16[5], u), 1580 ooa.addr16[6], oa->addr16[6], u), 1581 ooa.addr16[7], oa->addr16[7], u); 1582 break; 1583#endif /* INET6 */ 1584 } 1585} 1586 1587void 1588#ifdef __FreeBSD__ 1589pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 1590#else 1591pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1592#endif 1593 const struct pf_addr *saddr, const struct pf_addr *daddr, 1594 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1595 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1596 struct ether_header *eh, struct ifnet *ifp) 1597{ 1598 struct mbuf *m; 1599 int len = 0, tlen; /* make the compiler happy */ 1600#ifdef INET 1601 struct ip *h = NULL; /* make the compiler happy */ 1602#endif /* INET */ 1603#ifdef INET6 1604 struct ip6_hdr *h6 = NULL; /* make the compiler happy */ 1605#endif /* INET6 */ 1606 struct tcphdr *th = NULL; /* make the compiler happy */ 1607 char *opt; 1608 1609 /* maximum segment size tcp option */ 1610 tlen = sizeof(struct tcphdr); 1611 if (mss) 1612 tlen += 4; 1613 1614 switch (af) { 1615#ifdef INET 1616 case AF_INET: 1617 len = sizeof(struct ip) + tlen; 1618 break; 1619#endif /* INET */ 1620#ifdef INET6 1621 case AF_INET6: 1622 len = sizeof(struct ip6_hdr) + tlen; 1623 break; 1624#endif /* INET6 */ 1625 } 1626 1627 /* create outgoing mbuf */ 1628 m = m_gethdr(M_DONTWAIT, MT_HEADER); 1629 if (m == NULL) 1630 return; 1631#ifdef __FreeBSD__ 1632#ifdef MAC 1633 if (replyto) 1634 mac_create_mbuf_netlayer(replyto, m); 1635 else 1636 mac_create_mbuf_from_firewall(m); 1637#else 1638 (void)replyto; 1639#endif 1640#endif 1641 if (tag) { 1642#ifdef __FreeBSD__ 1643 m->m_flags |= M_SKIP_FIREWALL; 1644#else 1645 struct m_tag *mtag; 1646 1647 mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 1648 if (mtag == NULL) { 1649 m_freem(m); 1650 return; 1651 } 1652 m_tag_prepend(m, mtag); 1653#endif 1654 } 1655#ifdef ALTQ 1656 if (r != NULL && r->qid) { 1657 struct m_tag *mtag; 1658 struct altq_tag *atag; 1659 1660 mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 1661 if (mtag != NULL) { 1662 atag = (struct altq_tag *)(mtag + 1); 1663 atag->qid = r->qid; 1664 /* add hints for ecn */ 1665 atag->af = af; 1666 atag->hdr = mtod(m, struct ip *); 1667 m_tag_prepend(m, mtag); 1668 } 1669 } 1670#endif /* ALTQ */ 1671 m->m_data += max_linkhdr; 1672 m->m_pkthdr.len = m->m_len = len; 1673 m->m_pkthdr.rcvif = NULL; 1674 bzero(m->m_data, len); 1675 switch (af) { 1676#ifdef INET 1677 case AF_INET: 1678 h = mtod(m, struct ip *); 1679 1680 /* IP header fields included in the TCP checksum */ 1681 h->ip_p = IPPROTO_TCP; 1682 h->ip_len = htons(tlen); 1683 h->ip_src.s_addr = saddr->v4.s_addr; 1684 h->ip_dst.s_addr = daddr->v4.s_addr; 1685 1686 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1687 break; 1688#endif /* INET */ 1689#ifdef INET6 1690 case AF_INET6: 1691 h6 = mtod(m, struct ip6_hdr *); 1692 1693 /* IP header fields included in the TCP checksum */ 1694 h6->ip6_nxt = IPPROTO_TCP; 1695 h6->ip6_plen = htons(tlen); 1696 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1697 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1698 1699 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1700 break; 1701#endif /* INET6 */ 1702 } 1703 1704 /* TCP header */ 1705 th->th_sport = sport; 1706 th->th_dport = dport; 1707 th->th_seq = htonl(seq); 1708 th->th_ack = htonl(ack); 1709 th->th_off = tlen >> 2; 1710 th->th_flags = flags; 1711 th->th_win = htons(win); 1712 1713 if (mss) { 1714 opt = (char *)(th + 1); 1715 opt[0] = TCPOPT_MAXSEG; 1716 opt[1] = 4; 1717 HTONS(mss); 1718 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1719 } 1720 1721 switch (af) { 1722#ifdef INET 1723 case AF_INET: 1724 /* TCP checksum */ 1725 th->th_sum = in_cksum(m, len); 1726 1727 /* Finish the IP header */ 1728 h->ip_v = 4; 1729 h->ip_hl = sizeof(*h) >> 2; 1730 h->ip_tos = IPTOS_LOWDELAY; 1731#ifdef __FreeBSD__ 1732 h->ip_off = path_mtu_discovery ? IP_DF : 0; 1733 h->ip_len = len; 1734#else 1735 h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1736 h->ip_len = htons(len); 1737#endif 1738 h->ip_ttl = ttl ? ttl : ip_defttl; 1739 h->ip_sum = 0; 1740 if (eh == NULL) { 1741#ifdef __FreeBSD__ 1742 PF_UNLOCK(); 1743 ip_output(m, (void *)NULL, (void *)NULL, 0, 1744 (void *)NULL, (void *)NULL); 1745 PF_LOCK(); 1746#else /* ! __FreeBSD__ */ 1747 ip_output(m, (void *)NULL, (void *)NULL, 0, 1748 (void *)NULL, (void *)NULL); 1749#endif 1750 } else { 1751 struct route ro; 1752 struct rtentry rt; 1753 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1754 1755 if (ifp == NULL) { 1756 m_freem(m); 1757 return; 1758 } 1759 rt.rt_ifp = ifp; 1760 ro.ro_rt = &rt; 1761 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1762 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1763 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1764 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1765 e->ether_type = eh->ether_type; 1766#ifdef __FreeBSD__ 1767 PF_UNLOCK(); 1768 /* XXX_IMPORT: later */ 1769 ip_output(m, (void *)NULL, &ro, 0, 1770 (void *)NULL, (void *)NULL); 1771 PF_LOCK(); 1772#else /* ! __FreeBSD__ */ 1773 ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 1774 (void *)NULL, (void *)NULL); 1775#endif 1776 } 1777 break; 1778#endif /* INET */ 1779#ifdef INET6 1780 case AF_INET6: 1781 /* TCP checksum */ 1782 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1783 sizeof(struct ip6_hdr), tlen); 1784 1785 h6->ip6_vfc |= IPV6_VERSION; 1786 h6->ip6_hlim = IPV6_DEFHLIM; 1787 1788#ifdef __FreeBSD__ 1789 PF_UNLOCK(); 1790 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1791 PF_LOCK(); 1792#else 1793 ip6_output(m, NULL, NULL, 0, NULL, NULL); 1794#endif 1795 break; 1796#endif /* INET6 */ 1797 } 1798} 1799 1800void 1801pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1802 struct pf_rule *r) 1803{ 1804#ifdef ALTQ 1805 struct m_tag *mtag; 1806#endif 1807 struct mbuf *m0; 1808#ifdef __FreeBSD__ 1809 struct ip *ip; 1810#endif 1811 1812#ifdef __FreeBSD__ 1813 m0 = m_copypacket(m, M_DONTWAIT); 1814 if (m0 == NULL) 1815 return; 1816 m0->m_flags |= M_SKIP_FIREWALL; 1817#else 1818 mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 1819 if (mtag == NULL) 1820 return; 1821 m0 = m_copy(m, 0, M_COPYALL); 1822 if (m0 == NULL) { 1823 m_tag_free(mtag); 1824 return; 1825 } 1826 m_tag_prepend(m0, mtag); 1827#endif 1828 1829#ifdef ALTQ 1830 if (r->qid) { 1831 struct altq_tag *atag; 1832 1833 mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 1834 if (mtag != NULL) { 1835 atag = (struct altq_tag *)(mtag + 1); 1836 atag->qid = r->qid; 1837 /* add hints for ecn */ 1838 atag->af = af; 1839 atag->hdr = mtod(m0, struct ip *); 1840 m_tag_prepend(m0, mtag); 1841 } 1842 } 1843#endif /* ALTQ */ 1844 1845 switch (af) { 1846#ifdef INET 1847 case AF_INET: 1848#ifdef __FreeBSD__ 1849 /* icmp_error() expects host byte ordering */ 1850 ip = mtod(m0, struct ip *); 1851 NTOHS(ip->ip_len); 1852 NTOHS(ip->ip_off); 1853 PF_UNLOCK(); 1854 icmp_error(m0, type, code, 0, 0); 1855 PF_LOCK(); 1856#else 1857 icmp_error(m0, type, code, 0, (void *)NULL); 1858#endif 1859 break; 1860#endif /* INET */ 1861#ifdef INET6 1862 case AF_INET6: 1863#ifdef __FreeBSD__ 1864 PF_UNLOCK(); 1865#endif 1866 icmp6_error(m0, type, code, 0); 1867#ifdef __FreeBSD__ 1868 PF_LOCK(); 1869#endif 1870 break; 1871#endif /* INET6 */ 1872 } 1873} 1874 1875/* 1876 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1877 * If n is 0, they match if they are equal. If n is != 0, they match if they 1878 * are different. 1879 */ 1880int 1881pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1882 struct pf_addr *b, sa_family_t af) 1883{ 1884 int match = 0; 1885 1886 switch (af) { 1887#ifdef INET 1888 case AF_INET: 1889 if ((a->addr32[0] & m->addr32[0]) == 1890 (b->addr32[0] & m->addr32[0])) 1891 match++; 1892 break; 1893#endif /* INET */ 1894#ifdef INET6 1895 case AF_INET6: 1896 if (((a->addr32[0] & m->addr32[0]) == 1897 (b->addr32[0] & m->addr32[0])) && 1898 ((a->addr32[1] & m->addr32[1]) == 1899 (b->addr32[1] & m->addr32[1])) && 1900 ((a->addr32[2] & m->addr32[2]) == 1901 (b->addr32[2] & m->addr32[2])) && 1902 ((a->addr32[3] & m->addr32[3]) == 1903 (b->addr32[3] & m->addr32[3]))) 1904 match++; 1905 break; 1906#endif /* INET6 */ 1907 } 1908 if (match) { 1909 if (n) 1910 return (0); 1911 else 1912 return (1); 1913 } else { 1914 if (n) 1915 return (1); 1916 else 1917 return (0); 1918 } 1919} 1920 1921int 1922pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1923{ 1924 switch (op) { 1925 case PF_OP_IRG: 1926 return ((p > a1) && (p < a2)); 1927 case PF_OP_XRG: 1928 return ((p < a1) || (p > a2)); 1929 case PF_OP_RRG: 1930 return ((p >= a1) && (p <= a2)); 1931 case PF_OP_EQ: 1932 return (p == a1); 1933 case PF_OP_NE: 1934 return (p != a1); 1935 case PF_OP_LT: 1936 return (p < a1); 1937 case PF_OP_LE: 1938 return (p <= a1); 1939 case PF_OP_GT: 1940 return (p > a1); 1941 case PF_OP_GE: 1942 return (p >= a1); 1943 } 1944 return (0); /* never reached */ 1945} 1946 1947int 1948pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1949{ 1950 NTOHS(a1); 1951 NTOHS(a2); 1952 NTOHS(p); 1953 return (pf_match(op, a1, a2, p)); 1954} 1955 1956int 1957pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1958{ 1959 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1960 return (0); 1961 return (pf_match(op, a1, a2, u)); 1962} 1963 1964int 1965pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 1966{ 1967 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1968 return (0); 1969 return (pf_match(op, a1, a2, g)); 1970} 1971 1972struct pf_tag * 1973pf_get_tag(struct mbuf *m) 1974{ 1975 struct m_tag *mtag; 1976 1977 if ((mtag = m_tag_find(m, PACKET_TAG_PF_TAG, NULL)) != NULL) 1978 return ((struct pf_tag *)(mtag + 1)); 1979 else 1980 return (NULL); 1981} 1982 1983int 1984pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_tag **pftag, int *tag) 1985{ 1986 if (*tag == -1) { /* find mbuf tag */ 1987 *pftag = pf_get_tag(m); 1988 if (*pftag != NULL) 1989 *tag = (*pftag)->tag; 1990 else 1991 *tag = 0; 1992 } 1993 1994 return ((!r->match_tag_not && r->match_tag == *tag) || 1995 (r->match_tag_not && r->match_tag != *tag)); 1996} 1997 1998int 1999pf_tag_packet(struct mbuf *m, struct pf_tag *pftag, int tag) 2000{ 2001 struct m_tag *mtag; 2002 2003 if (tag <= 0) 2004 return (0); 2005 2006 if (pftag == NULL) { 2007 mtag = m_tag_get(PACKET_TAG_PF_TAG, sizeof(*pftag), M_NOWAIT); 2008 if (mtag == NULL) 2009 return (1); 2010 ((struct pf_tag *)(mtag + 1))->tag = tag; 2011 m_tag_prepend(m, mtag); 2012 } else 2013 pftag->tag = tag; 2014 2015 return (0); 2016} 2017 2018static void 2019pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2020 struct pf_rule **r, struct pf_rule **a) 2021{ 2022 struct pf_anchor_stackframe *f; 2023 2024 if (*depth >= sizeof(pf_anchor_stack) / 2025 sizeof(pf_anchor_stack[0])) { 2026 printf("pf_step_into_anchor: stack overflow\n"); 2027 *r = TAILQ_NEXT(*r, entries); 2028 return; 2029 } else if (*depth == 0 && a != NULL) 2030 *a = *r; 2031 f = pf_anchor_stack + (*depth)++; 2032 f->rs = *rs; 2033 f->r = *r; 2034 if ((*r)->anchor_wildcard) { 2035 f->parent = &(*r)->anchor->children; 2036 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2037 NULL) { 2038 *r = NULL; 2039 return; 2040 } 2041 *rs = &f->child->ruleset; 2042 } else { 2043 f->parent = NULL; 2044 f->child = NULL; 2045 *rs = &(*r)->anchor->ruleset; 2046 } 2047 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2048} 2049 2050static void 2051pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2052 struct pf_rule **r, struct pf_rule **a) 2053{ 2054 struct pf_anchor_stackframe *f; 2055 2056 do { 2057 if (*depth <= 0) 2058 break; 2059 f = pf_anchor_stack + *depth - 1; 2060 if (f->parent != NULL && f->child != NULL) { 2061 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2062 if (f->child != NULL) { 2063 *rs = &f->child->ruleset; 2064 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2065 if (*r == NULL) 2066 continue; 2067 else 2068 break; 2069 } 2070 } 2071 (*depth)--; 2072 if (*depth == 0 && a != NULL) 2073 *a = NULL; 2074 *rs = f->rs; 2075 *r = TAILQ_NEXT(f->r, entries); 2076 } while (*r == NULL); 2077} 2078 2079#ifdef INET6 2080void 2081pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2082 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2083{ 2084 switch (af) { 2085#ifdef INET 2086 case AF_INET: 2087 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2088 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2089 break; 2090#endif /* INET */ 2091 case AF_INET6: 2092 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2093 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2094 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2095 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2096 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2097 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2098 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2099 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2100 break; 2101 } 2102} 2103 2104void 2105pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2106{ 2107 switch (af) { 2108#ifdef INET 2109 case AF_INET: 2110 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2111 break; 2112#endif /* INET */ 2113 case AF_INET6: 2114 if (addr->addr32[3] == 0xffffffff) { 2115 addr->addr32[3] = 0; 2116 if (addr->addr32[2] == 0xffffffff) { 2117 addr->addr32[2] = 0; 2118 if (addr->addr32[1] == 0xffffffff) { 2119 addr->addr32[1] = 0; 2120 addr->addr32[0] = 2121 htonl(ntohl(addr->addr32[0]) + 1); 2122 } else 2123 addr->addr32[1] = 2124 htonl(ntohl(addr->addr32[1]) + 1); 2125 } else 2126 addr->addr32[2] = 2127 htonl(ntohl(addr->addr32[2]) + 1); 2128 } else 2129 addr->addr32[3] = 2130 htonl(ntohl(addr->addr32[3]) + 1); 2131 break; 2132 } 2133} 2134#endif /* INET6 */ 2135 2136#define mix(a,b,c) \ 2137 do { \ 2138 a -= b; a -= c; a ^= (c >> 13); \ 2139 b -= c; b -= a; b ^= (a << 8); \ 2140 c -= a; c -= b; c ^= (b >> 13); \ 2141 a -= b; a -= c; a ^= (c >> 12); \ 2142 b -= c; b -= a; b ^= (a << 16); \ 2143 c -= a; c -= b; c ^= (b >> 5); \ 2144 a -= b; a -= c; a ^= (c >> 3); \ 2145 b -= c; b -= a; b ^= (a << 10); \ 2146 c -= a; c -= b; c ^= (b >> 15); \ 2147 } while (0) 2148 2149/* 2150 * hash function based on bridge_hash in if_bridge.c 2151 */ 2152void 2153pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2154 struct pf_poolhashkey *key, sa_family_t af) 2155{ 2156 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2157 2158 switch (af) { 2159#ifdef INET 2160 case AF_INET: 2161 a += inaddr->addr32[0]; 2162 b += key->key32[1]; 2163 mix(a, b, c); 2164 hash->addr32[0] = c + key->key32[2]; 2165 break; 2166#endif /* INET */ 2167#ifdef INET6 2168 case AF_INET6: 2169 a += inaddr->addr32[0]; 2170 b += inaddr->addr32[2]; 2171 mix(a, b, c); 2172 hash->addr32[0] = c; 2173 a += inaddr->addr32[1]; 2174 b += inaddr->addr32[3]; 2175 c += key->key32[1]; 2176 mix(a, b, c); 2177 hash->addr32[1] = c; 2178 a += inaddr->addr32[2]; 2179 b += inaddr->addr32[1]; 2180 c += key->key32[2]; 2181 mix(a, b, c); 2182 hash->addr32[2] = c; 2183 a += inaddr->addr32[3]; 2184 b += inaddr->addr32[0]; 2185 c += key->key32[3]; 2186 mix(a, b, c); 2187 hash->addr32[3] = c; 2188 break; 2189#endif /* INET6 */ 2190 } 2191} 2192 2193int 2194pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2195 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2196{ 2197 unsigned char hash[16]; 2198 struct pf_pool *rpool = &r->rpool; 2199 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2200 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2201 struct pf_pooladdr *acur = rpool->cur; 2202 struct pf_src_node k; 2203 2204 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2205 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2206 k.af = af; 2207 PF_ACPY(&k.addr, saddr, af); 2208 if (r->rule_flag & PFRULE_RULESRCTRACK || 2209 r->rpool.opts & PF_POOL_STICKYADDR) 2210 k.rule.ptr = r; 2211 else 2212 k.rule.ptr = NULL; 2213 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2214 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2215 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2216 PF_ACPY(naddr, &(*sn)->raddr, af); 2217 if (pf_status.debug >= PF_DEBUG_MISC) { 2218 printf("pf_map_addr: src tracking maps "); 2219 pf_print_host(&k.addr, 0, af); 2220 printf(" to "); 2221 pf_print_host(naddr, 0, af); 2222 printf("\n"); 2223 } 2224 return (0); 2225 } 2226 } 2227 2228 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2229 return (1); 2230 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2231 switch (af) { 2232#ifdef INET 2233 case AF_INET: 2234 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2235 (rpool->opts & PF_POOL_TYPEMASK) != 2236 PF_POOL_ROUNDROBIN) 2237 return (1); 2238 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2239 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2240 break; 2241#endif /* INET */ 2242#ifdef INET6 2243 case AF_INET6: 2244 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2245 (rpool->opts & PF_POOL_TYPEMASK) != 2246 PF_POOL_ROUNDROBIN) 2247 return (1); 2248 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2249 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2250 break; 2251#endif /* INET6 */ 2252 } 2253 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2254 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2255 return (1); /* unsupported */ 2256 } else { 2257 raddr = &rpool->cur->addr.v.a.addr; 2258 rmask = &rpool->cur->addr.v.a.mask; 2259 } 2260 2261 switch (rpool->opts & PF_POOL_TYPEMASK) { 2262 case PF_POOL_NONE: 2263 PF_ACPY(naddr, raddr, af); 2264 break; 2265 case PF_POOL_BITMASK: 2266 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2267 break; 2268 case PF_POOL_RANDOM: 2269 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2270 switch (af) { 2271#ifdef INET 2272 case AF_INET: 2273 rpool->counter.addr32[0] = htonl(arc4random()); 2274 break; 2275#endif /* INET */ 2276#ifdef INET6 2277 case AF_INET6: 2278 if (rmask->addr32[3] != 0xffffffff) 2279 rpool->counter.addr32[3] = 2280 htonl(arc4random()); 2281 else 2282 break; 2283 if (rmask->addr32[2] != 0xffffffff) 2284 rpool->counter.addr32[2] = 2285 htonl(arc4random()); 2286 else 2287 break; 2288 if (rmask->addr32[1] != 0xffffffff) 2289 rpool->counter.addr32[1] = 2290 htonl(arc4random()); 2291 else 2292 break; 2293 if (rmask->addr32[0] != 0xffffffff) 2294 rpool->counter.addr32[0] = 2295 htonl(arc4random()); 2296 break; 2297#endif /* INET6 */ 2298 } 2299 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2300 PF_ACPY(init_addr, naddr, af); 2301 2302 } else { 2303 PF_AINC(&rpool->counter, af); 2304 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2305 } 2306 break; 2307 case PF_POOL_SRCHASH: 2308 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2309 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2310 break; 2311 case PF_POOL_ROUNDROBIN: 2312 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2313 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2314 &rpool->tblidx, &rpool->counter, 2315 &raddr, &rmask, af)) 2316 goto get_addr; 2317 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2318 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2319 &rpool->tblidx, &rpool->counter, 2320 &raddr, &rmask, af)) 2321 goto get_addr; 2322 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2323 goto get_addr; 2324 2325 try_next: 2326 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2327 rpool->cur = TAILQ_FIRST(&rpool->list); 2328 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2329 rpool->tblidx = -1; 2330 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2331 &rpool->tblidx, &rpool->counter, 2332 &raddr, &rmask, af)) { 2333 /* table contains no address of type 'af' */ 2334 if (rpool->cur != acur) 2335 goto try_next; 2336 return (1); 2337 } 2338 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2339 rpool->tblidx = -1; 2340 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2341 &rpool->tblidx, &rpool->counter, 2342 &raddr, &rmask, af)) { 2343 /* table contains no address of type 'af' */ 2344 if (rpool->cur != acur) 2345 goto try_next; 2346 return (1); 2347 } 2348 } else { 2349 raddr = &rpool->cur->addr.v.a.addr; 2350 rmask = &rpool->cur->addr.v.a.mask; 2351 PF_ACPY(&rpool->counter, raddr, af); 2352 } 2353 2354 get_addr: 2355 PF_ACPY(naddr, &rpool->counter, af); 2356 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2357 PF_ACPY(init_addr, naddr, af); 2358 PF_AINC(&rpool->counter, af); 2359 break; 2360 } 2361 if (*sn != NULL) 2362 PF_ACPY(&(*sn)->raddr, naddr, af); 2363 2364 if (pf_status.debug >= PF_DEBUG_MISC && 2365 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2366 printf("pf_map_addr: selected address "); 2367 pf_print_host(naddr, 0, af); 2368 printf("\n"); 2369 } 2370 2371 return (0); 2372} 2373 2374int 2375pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2376 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2377 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2378 struct pf_src_node **sn) 2379{ 2380 struct pf_state key; 2381 struct pf_addr init_addr; 2382 u_int16_t cut; 2383 2384 bzero(&init_addr, sizeof(init_addr)); 2385 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2386 return (1); 2387 2388 if (proto == IPPROTO_ICMP) { 2389 low = 1; 2390 high = 65535; 2391 } 2392 2393 do { 2394 key.af = af; 2395 key.proto = proto; 2396 PF_ACPY(&key.ext.addr, daddr, key.af); 2397 PF_ACPY(&key.gwy.addr, naddr, key.af); 2398 key.ext.port = dport; 2399 2400 /* 2401 * port search; start random, step; 2402 * similar 2 portloop in in_pcbbind 2403 */ 2404 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2405 proto == IPPROTO_ICMP)) { 2406 key.gwy.port = dport; 2407 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2408 return (0); 2409 } else if (low == 0 && high == 0) { 2410 key.gwy.port = *nport; 2411 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2412 return (0); 2413 } else if (low == high) { 2414 key.gwy.port = htons(low); 2415 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2416 *nport = htons(low); 2417 return (0); 2418 } 2419 } else { 2420 u_int16_t tmp; 2421 2422 if (low > high) { 2423 tmp = low; 2424 low = high; 2425 high = tmp; 2426 } 2427 /* low < high */ 2428 cut = htonl(arc4random()) % (1 + high - low) + low; 2429 /* low <= cut <= high */ 2430 for (tmp = cut; tmp <= high; ++(tmp)) { 2431 key.gwy.port = htons(tmp); 2432 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2433 NULL) { 2434 *nport = htons(tmp); 2435 return (0); 2436 } 2437 } 2438 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2439 key.gwy.port = htons(tmp); 2440 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2441 NULL) { 2442 *nport = htons(tmp); 2443 return (0); 2444 } 2445 } 2446 } 2447 2448 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2449 case PF_POOL_RANDOM: 2450 case PF_POOL_ROUNDROBIN: 2451 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2452 return (1); 2453 break; 2454 case PF_POOL_NONE: 2455 case PF_POOL_SRCHASH: 2456 case PF_POOL_BITMASK: 2457 default: 2458 return (1); 2459 } 2460 } while (! PF_AEQ(&init_addr, naddr, af) ); 2461 2462 return (1); /* none available */ 2463} 2464 2465struct pf_rule * 2466pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2467 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2468 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2469{ 2470 struct pf_rule *r, *rm = NULL; 2471 struct pf_ruleset *ruleset = NULL; 2472 struct pf_tag *pftag = NULL; 2473 int tag = -1; 2474 int asd = 0; 2475 2476 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2477 while (r && rm == NULL) { 2478 struct pf_rule_addr *src = NULL, *dst = NULL; 2479 struct pf_addr_wrap *xdst = NULL; 2480 2481 if (r->action == PF_BINAT && direction == PF_IN) { 2482 src = &r->dst; 2483 if (r->rpool.cur != NULL) 2484 xdst = &r->rpool.cur->addr; 2485 } else { 2486 src = &r->src; 2487 dst = &r->dst; 2488 } 2489 2490 r->evaluations++; 2491 if (r->kif != NULL && 2492 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 2493 r = r->skip[PF_SKIP_IFP].ptr; 2494 else if (r->direction && r->direction != direction) 2495 r = r->skip[PF_SKIP_DIR].ptr; 2496 else if (r->af && r->af != pd->af) 2497 r = r->skip[PF_SKIP_AF].ptr; 2498 else if (r->proto && r->proto != pd->proto) 2499 r = r->skip[PF_SKIP_PROTO].ptr; 2500 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->neg)) 2501 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2502 PF_SKIP_DST_ADDR].ptr; 2503 else if (src->port_op && !pf_match_port(src->port_op, 2504 src->port[0], src->port[1], sport)) 2505 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2506 PF_SKIP_DST_PORT].ptr; 2507 else if (dst != NULL && 2508 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg)) 2509 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2510 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0)) 2511 r = TAILQ_NEXT(r, entries); 2512 else if (dst != NULL && dst->port_op && 2513 !pf_match_port(dst->port_op, dst->port[0], 2514 dst->port[1], dport)) 2515 r = r->skip[PF_SKIP_DST_PORT].ptr; 2516 else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 2517 r = TAILQ_NEXT(r, entries); 2518 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2519 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2520 off, pd->hdr.tcp), r->os_fingerprint))) 2521 r = TAILQ_NEXT(r, entries); 2522 else { 2523 if (r->tag) 2524 tag = r->tag; 2525 if (r->anchor == NULL) { 2526 rm = r; 2527 } else 2528 pf_step_into_anchor(&asd, &ruleset, rs_num, &r, NULL); 2529 } 2530 if (r == NULL) 2531 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, NULL); 2532 } 2533 if (pf_tag_packet(m, pftag, tag)) 2534 return (NULL); 2535 if (rm != NULL && (rm->action == PF_NONAT || 2536 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2537 return (NULL); 2538 return (rm); 2539} 2540 2541struct pf_rule * 2542pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2543 struct pfi_kif *kif, struct pf_src_node **sn, 2544 struct pf_addr *saddr, u_int16_t sport, 2545 struct pf_addr *daddr, u_int16_t dport, 2546 struct pf_addr *naddr, u_int16_t *nport) 2547{ 2548 struct pf_rule *r = NULL; 2549 2550 if (direction == PF_OUT) { 2551 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2552 sport, daddr, dport, PF_RULESET_BINAT); 2553 if (r == NULL) 2554 r = pf_match_translation(pd, m, off, direction, kif, 2555 saddr, sport, daddr, dport, PF_RULESET_NAT); 2556 } else { 2557 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2558 sport, daddr, dport, PF_RULESET_RDR); 2559 if (r == NULL) 2560 r = pf_match_translation(pd, m, off, direction, kif, 2561 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2562 } 2563 2564 if (r != NULL) { 2565 switch (r->action) { 2566 case PF_NONAT: 2567 case PF_NOBINAT: 2568 case PF_NORDR: 2569 return (NULL); 2570 case PF_NAT: 2571 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2572 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2573 r->rpool.proxy_port[1], sn)) { 2574 DPFPRINTF(PF_DEBUG_MISC, 2575 ("pf: NAT proxy port allocation " 2576 "(%u-%u) failed\n", 2577 r->rpool.proxy_port[0], 2578 r->rpool.proxy_port[1])); 2579 return (NULL); 2580 } 2581 break; 2582 case PF_BINAT: 2583 switch (direction) { 2584 case PF_OUT: 2585 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2586 switch (pd->af) { 2587#ifdef INET 2588 case AF_INET: 2589 if (r->rpool.cur->addr.p.dyn-> 2590 pfid_acnt4 < 1) 2591 return (NULL); 2592 PF_POOLMASK(naddr, 2593 &r->rpool.cur->addr.p.dyn-> 2594 pfid_addr4, 2595 &r->rpool.cur->addr.p.dyn-> 2596 pfid_mask4, 2597 saddr, AF_INET); 2598 break; 2599#endif /* INET */ 2600#ifdef INET6 2601 case AF_INET6: 2602 if (r->rpool.cur->addr.p.dyn-> 2603 pfid_acnt6 < 1) 2604 return (NULL); 2605 PF_POOLMASK(naddr, 2606 &r->rpool.cur->addr.p.dyn-> 2607 pfid_addr6, 2608 &r->rpool.cur->addr.p.dyn-> 2609 pfid_mask6, 2610 saddr, AF_INET6); 2611 break; 2612#endif /* INET6 */ 2613 } 2614 } else 2615 PF_POOLMASK(naddr, 2616 &r->rpool.cur->addr.v.a.addr, 2617 &r->rpool.cur->addr.v.a.mask, 2618 saddr, pd->af); 2619 break; 2620 case PF_IN: 2621 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2622 switch (pd->af) { 2623#ifdef INET 2624 case AF_INET: 2625 if (r->src.addr.p.dyn-> 2626 pfid_acnt4 < 1) 2627 return (NULL); 2628 PF_POOLMASK(naddr, 2629 &r->src.addr.p.dyn-> 2630 pfid_addr4, 2631 &r->src.addr.p.dyn-> 2632 pfid_mask4, 2633 daddr, AF_INET); 2634 break; 2635#endif /* INET */ 2636#ifdef INET6 2637 case AF_INET6: 2638 if (r->src.addr.p.dyn-> 2639 pfid_acnt6 < 1) 2640 return (NULL); 2641 PF_POOLMASK(naddr, 2642 &r->src.addr.p.dyn-> 2643 pfid_addr6, 2644 &r->src.addr.p.dyn-> 2645 pfid_mask6, 2646 daddr, AF_INET6); 2647 break; 2648#endif /* INET6 */ 2649 } 2650 } else 2651 PF_POOLMASK(naddr, 2652 &r->src.addr.v.a.addr, 2653 &r->src.addr.v.a.mask, daddr, 2654 pd->af); 2655 break; 2656 } 2657 break; 2658 case PF_RDR: { 2659 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2660 return (NULL); 2661 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2662 PF_POOL_BITMASK) 2663 PF_POOLMASK(naddr, naddr, 2664 &r->rpool.cur->addr.v.a.mask, daddr, 2665 pd->af); 2666 2667 if (r->rpool.proxy_port[1]) { 2668 u_int32_t tmp_nport; 2669 2670 tmp_nport = ((ntohs(dport) - 2671 ntohs(r->dst.port[0])) % 2672 (r->rpool.proxy_port[1] - 2673 r->rpool.proxy_port[0] + 1)) + 2674 r->rpool.proxy_port[0]; 2675 2676 /* wrap around if necessary */ 2677 if (tmp_nport > 65535) 2678 tmp_nport -= 65535; 2679 *nport = htons((u_int16_t)tmp_nport); 2680 } else if (r->rpool.proxy_port[0]) 2681 *nport = htons(r->rpool.proxy_port[0]); 2682 break; 2683 } 2684 default: 2685 return (NULL); 2686 } 2687 } 2688 2689 return (r); 2690} 2691 2692int 2693#ifdef __FreeBSD__ 2694pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd, 2695 struct inpcb *inp_arg) 2696#else 2697pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd) 2698#endif 2699{ 2700 struct pf_addr *saddr, *daddr; 2701 u_int16_t sport, dport; 2702#ifdef __FreeBSD__ 2703 struct inpcbinfo *pi; 2704#else 2705 struct inpcbtable *tb; 2706#endif 2707 struct inpcb *inp; 2708 2709 *uid = UID_MAX; 2710 *gid = GID_MAX; 2711#ifdef __FreeBSD__ 2712 if (inp_arg != NULL) { 2713 INP_LOCK_ASSERT(inp_arg); 2714 if (inp_arg->inp_socket) { 2715 *uid = inp_arg->inp_socket->so_cred->cr_uid; 2716 *gid = inp_arg->inp_socket->so_cred->cr_groups[0]; 2717 return (1); 2718 } else 2719 return (0); 2720 } 2721#endif 2722 switch (pd->proto) { 2723 case IPPROTO_TCP: 2724 sport = pd->hdr.tcp->th_sport; 2725 dport = pd->hdr.tcp->th_dport; 2726#ifdef __FreeBSD__ 2727 pi = &tcbinfo; 2728#else 2729 tb = &tcbtable; 2730#endif 2731 break; 2732 case IPPROTO_UDP: 2733 sport = pd->hdr.udp->uh_sport; 2734 dport = pd->hdr.udp->uh_dport; 2735#ifdef __FreeBSD__ 2736 pi = &udbinfo; 2737#else 2738 tb = &udbtable; 2739#endif 2740 break; 2741 default: 2742 return (0); 2743 } 2744 if (direction == PF_IN) { 2745 saddr = pd->src; 2746 daddr = pd->dst; 2747 } else { 2748 u_int16_t p; 2749 2750 p = sport; 2751 sport = dport; 2752 dport = p; 2753 saddr = pd->dst; 2754 daddr = pd->src; 2755 } 2756 switch (pd->af) { 2757#ifdef INET 2758 case AF_INET: 2759#ifdef __FreeBSD__ 2760 INP_INFO_RLOCK(pi); /* XXX LOR */ 2761 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2762 dport, 0, NULL); 2763 if (inp == NULL) { 2764 inp = in_pcblookup_hash(pi, saddr->v4, sport, 2765 daddr->v4, dport, INPLOOKUP_WILDCARD, NULL); 2766 if(inp == NULL) { 2767 INP_INFO_RUNLOCK(pi); 2768 return (0); 2769 } 2770 } 2771#else 2772 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 2773 if (inp == NULL) { 2774 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 2775 if (inp == NULL) 2776 return (0); 2777 } 2778#endif 2779 break; 2780#endif /* INET */ 2781#ifdef INET6 2782 case AF_INET6: 2783#ifdef __FreeBSD__ 2784 INP_INFO_RLOCK(pi); 2785 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2786 &daddr->v6, dport, 0, NULL); 2787 if (inp == NULL) { 2788 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2789 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2790 if (inp == NULL) { 2791 INP_INFO_RUNLOCK(pi); 2792 return (0); 2793 } 2794 } 2795#else 2796 inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 2797 dport); 2798 if (inp == NULL) { 2799 inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 2800 if (inp == NULL) 2801 return (0); 2802 } 2803#endif 2804 break; 2805#endif /* INET6 */ 2806 2807 default: 2808 return (0); 2809 } 2810#ifdef __FreeBSD__ 2811 INP_LOCK(inp); 2812 if ((inp->inp_socket == NULL) || (inp->inp_socket->so_cred == NULL)) { 2813 INP_UNLOCK(inp); 2814 INP_INFO_RUNLOCK(pi); 2815 return (0); 2816 } 2817 *uid = inp->inp_socket->so_cred->cr_uid; 2818 *gid = inp->inp_socket->so_cred->cr_groups[0]; 2819 INP_UNLOCK(inp); 2820 INP_INFO_RUNLOCK(pi); 2821#else 2822 *uid = inp->inp_socket->so_euid; 2823 *gid = inp->inp_socket->so_egid; 2824#endif 2825 return (1); 2826} 2827 2828u_int8_t 2829pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2830{ 2831 int hlen; 2832 u_int8_t hdr[60]; 2833 u_int8_t *opt, optlen; 2834 u_int8_t wscale = 0; 2835 2836 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2837 if (hlen <= sizeof(struct tcphdr)) 2838 return (0); 2839 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2840 return (0); 2841 opt = hdr + sizeof(struct tcphdr); 2842 hlen -= sizeof(struct tcphdr); 2843 while (hlen >= 3) { 2844 switch (*opt) { 2845 case TCPOPT_EOL: 2846 case TCPOPT_NOP: 2847 ++opt; 2848 --hlen; 2849 break; 2850 case TCPOPT_WINDOW: 2851 wscale = opt[2]; 2852 if (wscale > TCP_MAX_WINSHIFT) 2853 wscale = TCP_MAX_WINSHIFT; 2854 wscale |= PF_WSCALE_FLAG; 2855 /* FALLTHROUGH */ 2856 default: 2857 optlen = opt[1]; 2858 if (optlen < 2) 2859 optlen = 2; 2860 hlen -= optlen; 2861 opt += optlen; 2862 break; 2863 } 2864 } 2865 return (wscale); 2866} 2867 2868u_int16_t 2869pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2870{ 2871 int hlen; 2872 u_int8_t hdr[60]; 2873 u_int8_t *opt, optlen; 2874 u_int16_t mss = tcp_mssdflt; 2875 2876 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2877 if (hlen <= sizeof(struct tcphdr)) 2878 return (0); 2879 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2880 return (0); 2881 opt = hdr + sizeof(struct tcphdr); 2882 hlen -= sizeof(struct tcphdr); 2883 while (hlen >= TCPOLEN_MAXSEG) { 2884 switch (*opt) { 2885 case TCPOPT_EOL: 2886 case TCPOPT_NOP: 2887 ++opt; 2888 --hlen; 2889 break; 2890 case TCPOPT_MAXSEG: 2891 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2892 NTOHS(mss); 2893 /* FALLTHROUGH */ 2894 default: 2895 optlen = opt[1]; 2896 if (optlen < 2) 2897 optlen = 2; 2898 hlen -= optlen; 2899 opt += optlen; 2900 break; 2901 } 2902 } 2903 return (mss); 2904} 2905 2906u_int16_t 2907pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2908{ 2909#ifdef INET 2910 struct sockaddr_in *dst; 2911 struct route ro; 2912#endif /* INET */ 2913#ifdef INET6 2914 struct sockaddr_in6 *dst6; 2915 struct route_in6 ro6; 2916#endif /* INET6 */ 2917 struct rtentry *rt = NULL; 2918 int hlen = 0; /* make the compiler happy */ 2919 u_int16_t mss = tcp_mssdflt; 2920 2921 switch (af) { 2922#ifdef INET 2923 case AF_INET: 2924 hlen = sizeof(struct ip); 2925 bzero(&ro, sizeof(ro)); 2926 dst = (struct sockaddr_in *)&ro.ro_dst; 2927 dst->sin_family = AF_INET; 2928 dst->sin_len = sizeof(*dst); 2929 dst->sin_addr = addr->v4; 2930#ifdef __FreeBSD__ 2931#ifdef RTF_PRCLONING 2932 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 2933#else /* !RTF_PRCLONING */ 2934 rtalloc_ign(&ro, RTF_CLONING); 2935#endif 2936#else /* ! __FreeBSD__ */ 2937 rtalloc_noclone(&ro, NO_CLONING); 2938#endif 2939 rt = ro.ro_rt; 2940 break; 2941#endif /* INET */ 2942#ifdef INET6 2943 case AF_INET6: 2944 hlen = sizeof(struct ip6_hdr); 2945 bzero(&ro6, sizeof(ro6)); 2946 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2947 dst6->sin6_family = AF_INET6; 2948 dst6->sin6_len = sizeof(*dst6); 2949 dst6->sin6_addr = addr->v6; 2950#ifdef __FreeBSD__ 2951#ifdef RTF_PRCLONING 2952 rtalloc_ign((struct route *)&ro6, 2953 (RTF_CLONING | RTF_PRCLONING)); 2954#else /* !RTF_PRCLONING */ 2955 rtalloc_ign((struct route *)&ro6, RTF_CLONING); 2956#endif 2957#else /* ! __FreeBSD__ */ 2958 rtalloc_noclone((struct route *)&ro6, NO_CLONING); 2959#endif 2960 rt = ro6.ro_rt; 2961 break; 2962#endif /* INET6 */ 2963 } 2964 2965 if (rt && rt->rt_ifp) { 2966 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2967 mss = max(tcp_mssdflt, mss); 2968 RTFREE(rt); 2969 } 2970 mss = min(mss, offer); 2971 mss = max(mss, 64); /* sanity - at least max opt space */ 2972 return (mss); 2973} 2974 2975void 2976pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2977{ 2978 struct pf_rule *r = s->rule.ptr; 2979 2980 s->rt_kif = NULL; 2981 if (!r->rt || r->rt == PF_FASTROUTE) 2982 return; 2983 switch (s->af) { 2984#ifdef INET 2985 case AF_INET: 2986 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 2987 &s->nat_src_node); 2988 s->rt_kif = r->rpool.cur->kif; 2989 break; 2990#endif /* INET */ 2991#ifdef INET6 2992 case AF_INET6: 2993 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 2994 &s->nat_src_node); 2995 s->rt_kif = r->rpool.cur->kif; 2996 break; 2997#endif /* INET6 */ 2998 } 2999} 3000 3001int 3002pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 3003 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3004#ifdef __FreeBSD__ 3005 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3006 struct ifqueue *ifq, struct inpcb *inp) 3007#else 3008 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3009 struct ifqueue *ifq) 3010#endif 3011{ 3012 struct pf_rule *nr = NULL; 3013 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3014 struct tcphdr *th = pd->hdr.tcp; 3015 u_int16_t bport, nport = 0; 3016 sa_family_t af = pd->af; 3017 int lookup = -1; 3018 uid_t uid; 3019 gid_t gid; 3020 struct pf_rule *r, *a = NULL; 3021 struct pf_ruleset *ruleset = NULL; 3022 struct pf_src_node *nsn = NULL; 3023 u_short reason; 3024 int rewrite = 0; 3025 struct pf_tag *pftag = NULL; 3026 int tag = -1; 3027 u_int16_t mss = tcp_mssdflt; 3028 int asd = 0; 3029 3030 if (pf_check_congestion(ifq)) { 3031 REASON_SET(&reason, PFRES_CONGEST); 3032 return (PF_DROP); 3033 } 3034 3035 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3036 3037 if (direction == PF_OUT) { 3038 bport = nport = th->th_sport; 3039 /* check outgoing packet for BINAT/NAT */ 3040 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3041 saddr, th->th_sport, daddr, th->th_dport, 3042 &pd->naddr, &nport)) != NULL) { 3043 PF_ACPY(&pd->baddr, saddr, af); 3044 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3045 &th->th_sum, &pd->naddr, nport, 0, af); 3046 rewrite++; 3047 if (nr->natpass) 3048 r = NULL; 3049 pd->nat_rule = nr; 3050 } 3051 } else { 3052 bport = nport = th->th_dport; 3053 /* check incoming packet for BINAT/RDR */ 3054 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3055 saddr, th->th_sport, daddr, th->th_dport, 3056 &pd->naddr, &nport)) != NULL) { 3057 PF_ACPY(&pd->baddr, daddr, af); 3058 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3059 &th->th_sum, &pd->naddr, nport, 0, af); 3060 rewrite++; 3061 if (nr->natpass) 3062 r = NULL; 3063 pd->nat_rule = nr; 3064 } 3065 } 3066 3067 while (r != NULL) { 3068 r->evaluations++; 3069 if (r->kif != NULL && 3070 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3071 r = r->skip[PF_SKIP_IFP].ptr; 3072 else if (r->direction && r->direction != direction) 3073 r = r->skip[PF_SKIP_DIR].ptr; 3074 else if (r->af && r->af != af) 3075 r = r->skip[PF_SKIP_AF].ptr; 3076 else if (r->proto && r->proto != IPPROTO_TCP) 3077 r = r->skip[PF_SKIP_PROTO].ptr; 3078 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg)) 3079 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3080 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3081 r->src.port[0], r->src.port[1], th->th_sport)) 3082 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3083 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg)) 3084 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3085 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3086 r->dst.port[0], r->dst.port[1], th->th_dport)) 3087 r = r->skip[PF_SKIP_DST_PORT].ptr; 3088 else if (r->tos && !(r->tos & pd->tos)) 3089 r = TAILQ_NEXT(r, entries); 3090 else if (r->rule_flag & PFRULE_FRAGMENT) 3091 r = TAILQ_NEXT(r, entries); 3092 else if ((r->flagset & th->th_flags) != r->flags) 3093 r = TAILQ_NEXT(r, entries); 3094 else if (r->uid.op && (lookup != -1 || (lookup = 3095#ifdef __FreeBSD__ 3096 pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3097#else 3098 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3099#endif 3100 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3101 uid)) 3102 r = TAILQ_NEXT(r, entries); 3103 else if (r->gid.op && (lookup != -1 || (lookup = 3104#ifdef __FreeBSD__ 3105 pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3106#else 3107 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3108#endif 3109 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3110 gid)) 3111 r = TAILQ_NEXT(r, entries); 3112 else if (r->prob && r->prob <= arc4random()) 3113 r = TAILQ_NEXT(r, entries); 3114 else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 3115 r = TAILQ_NEXT(r, entries); 3116 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3117 pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3118 r = TAILQ_NEXT(r, entries); 3119 else { 3120 if (r->tag) 3121 tag = r->tag; 3122 if (r->anchor == NULL) { 3123 *rm = r; 3124 *am = a; 3125 *rsm = ruleset; 3126 if ((*rm)->quick) 3127 break; 3128 r = TAILQ_NEXT(r, entries); 3129 } else 3130 pf_step_into_anchor(&asd, &ruleset, 3131 PF_RULESET_FILTER, &r, &a); 3132 } 3133 if (r == NULL) 3134 pf_step_out_of_anchor(&asd, &ruleset, 3135 PF_RULESET_FILTER, &r, &a); 3136 } 3137 r = *rm; 3138 a = *am; 3139 ruleset = *rsm; 3140 3141 REASON_SET(&reason, PFRES_MATCH); 3142 3143 if (r->log) { 3144 if (rewrite) 3145 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3146 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3147 } 3148 3149 if ((r->action == PF_DROP) && 3150 ((r->rule_flag & PFRULE_RETURNRST) || 3151 (r->rule_flag & PFRULE_RETURNICMP) || 3152 (r->rule_flag & PFRULE_RETURN))) { 3153 /* undo NAT changes, if they have taken place */ 3154 if (nr != NULL) { 3155 if (direction == PF_OUT) { 3156 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3157 &th->th_sum, &pd->baddr, bport, 0, af); 3158 rewrite++; 3159 } else { 3160 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3161 &th->th_sum, &pd->baddr, bport, 0, af); 3162 rewrite++; 3163 } 3164 } 3165 if (((r->rule_flag & PFRULE_RETURNRST) || 3166 (r->rule_flag & PFRULE_RETURN)) && 3167 !(th->th_flags & TH_RST)) { 3168 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3169 3170 if (th->th_flags & TH_SYN) 3171 ack++; 3172 if (th->th_flags & TH_FIN) 3173 ack++; 3174#ifdef __FreeBSD__ 3175 pf_send_tcp(m, r, af, pd->dst, 3176#else 3177 pf_send_tcp(r, af, pd->dst, 3178#endif 3179 pd->src, th->th_dport, th->th_sport, 3180 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3181 r->return_ttl, 1, pd->eh, kif->pfik_ifp); 3182 } else if ((af == AF_INET) && r->return_icmp) 3183 pf_send_icmp(m, r->return_icmp >> 8, 3184 r->return_icmp & 255, af, r); 3185 else if ((af == AF_INET6) && r->return_icmp6) 3186 pf_send_icmp(m, r->return_icmp6 >> 8, 3187 r->return_icmp6 & 255, af, r); 3188 } 3189 3190 if (r->action == PF_DROP) 3191 return (PF_DROP); 3192 3193 if (pf_tag_packet(m, pftag, tag)) { 3194 REASON_SET(&reason, PFRES_MEMORY); 3195 return (PF_DROP); 3196 } 3197 3198 if (r->keep_state || nr != NULL || 3199 (pd->flags & PFDESC_TCP_NORM)) { 3200 /* create new state */ 3201 u_int16_t len; 3202 struct pf_state *s = NULL; 3203 struct pf_src_node *sn = NULL; 3204 3205 len = pd->tot_len - off - (th->th_off << 2); 3206 3207 /* check maximums */ 3208 if (r->max_states && (r->states >= r->max_states)) { 3209 pf_status.lcounters[LCNT_STATES]++; 3210 REASON_SET(&reason, PFRES_MAXSTATES); 3211 goto cleanup; 3212 } 3213 /* src node for flter rule */ 3214 if ((r->rule_flag & PFRULE_SRCTRACK || 3215 r->rpool.opts & PF_POOL_STICKYADDR) && 3216 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3217 REASON_SET(&reason, PFRES_SRCLIMIT); 3218 goto cleanup; 3219 } 3220 /* src node for translation rule */ 3221 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3222 ((direction == PF_OUT && 3223 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3224 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3225 REASON_SET(&reason, PFRES_SRCLIMIT); 3226 goto cleanup; 3227 } 3228 s = pool_get(&pf_state_pl, PR_NOWAIT); 3229 if (s == NULL) { 3230 REASON_SET(&reason, PFRES_MEMORY); 3231cleanup: 3232 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3233 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3234 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3235 pf_status.src_nodes--; 3236 pool_put(&pf_src_tree_pl, sn); 3237 } 3238 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3239 nsn->expire == 0) { 3240 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3241 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3242 pf_status.src_nodes--; 3243 pool_put(&pf_src_tree_pl, nsn); 3244 } 3245 return (PF_DROP); 3246 } 3247 bzero(s, sizeof(*s)); 3248 s->rule.ptr = r; 3249 s->nat_rule.ptr = nr; 3250 s->anchor.ptr = a; 3251 STATE_INC_COUNTERS(s); 3252 s->allow_opts = r->allow_opts; 3253 s->log = r->log & 2; 3254 s->proto = IPPROTO_TCP; 3255 s->direction = direction; 3256 s->af = af; 3257 if (direction == PF_OUT) { 3258 PF_ACPY(&s->gwy.addr, saddr, af); 3259 s->gwy.port = th->th_sport; /* sport */ 3260 PF_ACPY(&s->ext.addr, daddr, af); 3261 s->ext.port = th->th_dport; 3262 if (nr != NULL) { 3263 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3264 s->lan.port = bport; 3265 } else { 3266 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3267 s->lan.port = s->gwy.port; 3268 } 3269 } else { 3270 PF_ACPY(&s->lan.addr, daddr, af); 3271 s->lan.port = th->th_dport; 3272 PF_ACPY(&s->ext.addr, saddr, af); 3273 s->ext.port = th->th_sport; 3274 if (nr != NULL) { 3275 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3276 s->gwy.port = bport; 3277 } else { 3278 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3279 s->gwy.port = s->lan.port; 3280 } 3281 } 3282 3283 s->src.seqlo = ntohl(th->th_seq); 3284 s->src.seqhi = s->src.seqlo + len + 1; 3285 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3286 r->keep_state == PF_STATE_MODULATE) { 3287 /* Generate sequence number modulator */ 3288 while ((s->src.seqdiff = htonl(arc4random())) == 0) 3289 ; 3290 pf_change_a(&th->th_seq, &th->th_sum, 3291 htonl(s->src.seqlo + s->src.seqdiff), 0); 3292 rewrite = 1; 3293 } else 3294 s->src.seqdiff = 0; 3295 if (th->th_flags & TH_SYN) { 3296 s->src.seqhi++; 3297 s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3298 } 3299 s->src.max_win = MAX(ntohs(th->th_win), 1); 3300 if (s->src.wscale & PF_WSCALE_MASK) { 3301 /* Remove scale factor from initial window */ 3302 int win = s->src.max_win; 3303 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3304 s->src.max_win = (win - 1) >> 3305 (s->src.wscale & PF_WSCALE_MASK); 3306 } 3307 if (th->th_flags & TH_FIN) 3308 s->src.seqhi++; 3309 s->dst.seqhi = 1; 3310 s->dst.max_win = 1; 3311 s->src.state = TCPS_SYN_SENT; 3312 s->dst.state = TCPS_CLOSED; 3313 s->creation = time_second; 3314 s->expire = time_second; 3315 s->timeout = PFTM_TCP_FIRST_PACKET; 3316 pf_set_rt_ifp(s, saddr); 3317 if (sn != NULL) { 3318 s->src_node = sn; 3319 s->src_node->states++; 3320 } 3321 if (nsn != NULL) { 3322 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3323 s->nat_src_node = nsn; 3324 s->nat_src_node->states++; 3325 } 3326 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3327 off, pd, th, &s->src, &s->dst)) { 3328 REASON_SET(&reason, PFRES_MEMORY); 3329 pf_src_tree_remove_state(s); 3330 STATE_DEC_COUNTERS(s); 3331 pool_put(&pf_state_pl, s); 3332 return (PF_DROP); 3333 } 3334 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3335 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3336 &s->src, &s->dst, &rewrite)) { 3337 /* This really shouldn't happen!!! */ 3338 DPFPRINTF(PF_DEBUG_URGENT, 3339 ("pf_normalize_tcp_stateful failed on first pkt")); 3340 pf_normalize_tcp_cleanup(s); 3341 pf_src_tree_remove_state(s); 3342 STATE_DEC_COUNTERS(s); 3343 pool_put(&pf_state_pl, s); 3344 return (PF_DROP); 3345 } 3346 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3347 pf_normalize_tcp_cleanup(s); 3348 REASON_SET(&reason, PFRES_STATEINS); 3349 pf_src_tree_remove_state(s); 3350 STATE_DEC_COUNTERS(s); 3351 pool_put(&pf_state_pl, s); 3352 return (PF_DROP); 3353 } else 3354 *sm = s; 3355 if (tag > 0) { 3356 pf_tag_ref(tag); 3357 s->tag = tag; 3358 } 3359 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3360 r->keep_state == PF_STATE_SYNPROXY) { 3361 s->src.state = PF_TCPS_PROXY_SRC; 3362 if (nr != NULL) { 3363 if (direction == PF_OUT) { 3364 pf_change_ap(saddr, &th->th_sport, 3365 pd->ip_sum, &th->th_sum, &pd->baddr, 3366 bport, 0, af); 3367 } else { 3368 pf_change_ap(daddr, &th->th_dport, 3369 pd->ip_sum, &th->th_sum, &pd->baddr, 3370 bport, 0, af); 3371 } 3372 } 3373 s->src.seqhi = htonl(arc4random()); 3374 /* Find mss option */ 3375 mss = pf_get_mss(m, off, th->th_off, af); 3376 mss = pf_calc_mss(saddr, af, mss); 3377 mss = pf_calc_mss(daddr, af, mss); 3378 s->src.mss = mss; 3379#ifdef __FreeBSD__ 3380 pf_send_tcp(NULL, r, af, daddr, saddr, th->th_dport, 3381#else 3382 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3383#endif 3384 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3385 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, NULL, NULL); 3386 REASON_SET(&reason, PFRES_SYNPROXY); 3387 return (PF_SYNPROXY_DROP); 3388 } 3389 } 3390 3391 /* copy back packet headers if we performed NAT operations */ 3392 if (rewrite) 3393 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3394 3395 return (PF_PASS); 3396} 3397 3398int 3399pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3400 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3401#ifdef __FreeBSD__ 3402 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3403 struct ifqueue *ifq, struct inpcb *inp) 3404#else 3405 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3406 struct ifqueue *ifq) 3407#endif 3408{ 3409 struct pf_rule *nr = NULL; 3410 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3411 struct udphdr *uh = pd->hdr.udp; 3412 u_int16_t bport, nport = 0; 3413 sa_family_t af = pd->af; 3414 int lookup = -1; 3415 uid_t uid; 3416 gid_t gid; 3417 struct pf_rule *r, *a = NULL; 3418 struct pf_ruleset *ruleset = NULL; 3419 struct pf_src_node *nsn = NULL; 3420 u_short reason; 3421 int rewrite = 0; 3422 struct pf_tag *pftag = NULL; 3423 int tag = -1; 3424 int asd = 0; 3425 3426 if (pf_check_congestion(ifq)) { 3427 REASON_SET(&reason, PFRES_CONGEST); 3428 return (PF_DROP); 3429 } 3430 3431 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3432 3433 if (direction == PF_OUT) { 3434 bport = nport = uh->uh_sport; 3435 /* check outgoing packet for BINAT/NAT */ 3436 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3437 saddr, uh->uh_sport, daddr, uh->uh_dport, 3438 &pd->naddr, &nport)) != NULL) { 3439 PF_ACPY(&pd->baddr, saddr, af); 3440 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3441 &uh->uh_sum, &pd->naddr, nport, 1, af); 3442 rewrite++; 3443 if (nr->natpass) 3444 r = NULL; 3445 pd->nat_rule = nr; 3446 } 3447 } else { 3448 bport = nport = uh->uh_dport; 3449 /* check incoming packet for BINAT/RDR */ 3450 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3451 saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3452 &nport)) != NULL) { 3453 PF_ACPY(&pd->baddr, daddr, af); 3454 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3455 &uh->uh_sum, &pd->naddr, nport, 1, af); 3456 rewrite++; 3457 if (nr->natpass) 3458 r = NULL; 3459 pd->nat_rule = nr; 3460 } 3461 } 3462 3463 while (r != NULL) { 3464 r->evaluations++; 3465 if (r->kif != NULL && 3466 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3467 r = r->skip[PF_SKIP_IFP].ptr; 3468 else if (r->direction && r->direction != direction) 3469 r = r->skip[PF_SKIP_DIR].ptr; 3470 else if (r->af && r->af != af) 3471 r = r->skip[PF_SKIP_AF].ptr; 3472 else if (r->proto && r->proto != IPPROTO_UDP) 3473 r = r->skip[PF_SKIP_PROTO].ptr; 3474 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg)) 3475 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3476 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3477 r->src.port[0], r->src.port[1], uh->uh_sport)) 3478 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3479 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg)) 3480 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3481 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3482 r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3483 r = r->skip[PF_SKIP_DST_PORT].ptr; 3484 else if (r->tos && !(r->tos & pd->tos)) 3485 r = TAILQ_NEXT(r, entries); 3486 else if (r->rule_flag & PFRULE_FRAGMENT) 3487 r = TAILQ_NEXT(r, entries); 3488 else if (r->uid.op && (lookup != -1 || (lookup = 3489#ifdef __FreeBSD__ 3490 pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3491#else 3492 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3493#endif 3494 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3495 uid)) 3496 r = TAILQ_NEXT(r, entries); 3497 else if (r->gid.op && (lookup != -1 || (lookup = 3498#ifdef __FreeBSD__ 3499 pf_socket_lookup(&uid, &gid, direction, pd, inp), 1)) && 3500#else 3501 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 3502#endif 3503 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3504 gid)) 3505 r = TAILQ_NEXT(r, entries); 3506 else if (r->prob && r->prob <= arc4random()) 3507 r = TAILQ_NEXT(r, entries); 3508 else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 3509 r = TAILQ_NEXT(r, entries); 3510 else if (r->os_fingerprint != PF_OSFP_ANY) 3511 r = TAILQ_NEXT(r, entries); 3512 else { 3513 if (r->tag) 3514 tag = r->tag; 3515 if (r->anchor == NULL) { 3516 *rm = r; 3517 *am = a; 3518 *rsm = ruleset; 3519 if ((*rm)->quick) 3520 break; 3521 r = TAILQ_NEXT(r, entries); 3522 } else 3523 pf_step_into_anchor(&asd, &ruleset, 3524 PF_RULESET_FILTER, &r, &a); 3525 } 3526 if (r == NULL) 3527 pf_step_out_of_anchor(&asd, &ruleset, 3528 PF_RULESET_FILTER, &r, &a); 3529 } 3530 r = *rm; 3531 a = *am; 3532 ruleset = *rsm; 3533 3534 REASON_SET(&reason, PFRES_MATCH); 3535 3536 if (r->log) { 3537 if (rewrite) 3538 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3539 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3540 } 3541 3542 if ((r->action == PF_DROP) && 3543 ((r->rule_flag & PFRULE_RETURNICMP) || 3544 (r->rule_flag & PFRULE_RETURN))) { 3545 /* undo NAT changes, if they have taken place */ 3546 if (nr != NULL) { 3547 if (direction == PF_OUT) { 3548 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3549 &uh->uh_sum, &pd->baddr, bport, 1, af); 3550 rewrite++; 3551 } else { 3552 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3553 &uh->uh_sum, &pd->baddr, bport, 1, af); 3554 rewrite++; 3555 } 3556 } 3557 if ((af == AF_INET) && r->return_icmp) 3558 pf_send_icmp(m, r->return_icmp >> 8, 3559 r->return_icmp & 255, af, r); 3560 else if ((af == AF_INET6) && r->return_icmp6) 3561 pf_send_icmp(m, r->return_icmp6 >> 8, 3562 r->return_icmp6 & 255, af, r); 3563 } 3564 3565 if (r->action == PF_DROP) 3566 return (PF_DROP); 3567 3568 if (pf_tag_packet(m, pftag, tag)) { 3569 REASON_SET(&reason, PFRES_MEMORY); 3570 return (PF_DROP); 3571 } 3572 3573 if (r->keep_state || nr != NULL) { 3574 /* create new state */ 3575 struct pf_state *s = NULL; 3576 struct pf_src_node *sn = NULL; 3577 3578 /* check maximums */ 3579 if (r->max_states && (r->states >= r->max_states)) { 3580 pf_status.lcounters[LCNT_STATES]++; 3581 REASON_SET(&reason, PFRES_MAXSTATES); 3582 goto cleanup; 3583 } 3584 /* src node for flter rule */ 3585 if ((r->rule_flag & PFRULE_SRCTRACK || 3586 r->rpool.opts & PF_POOL_STICKYADDR) && 3587 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3588 REASON_SET(&reason, PFRES_SRCLIMIT); 3589 goto cleanup; 3590 } 3591 /* src node for translation rule */ 3592 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3593 ((direction == PF_OUT && 3594 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3595 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3596 REASON_SET(&reason, PFRES_SRCLIMIT); 3597 goto cleanup; 3598 } 3599 s = pool_get(&pf_state_pl, PR_NOWAIT); 3600 if (s == NULL) { 3601 REASON_SET(&reason, PFRES_MEMORY); 3602cleanup: 3603 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3604 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3605 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3606 pf_status.src_nodes--; 3607 pool_put(&pf_src_tree_pl, sn); 3608 } 3609 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3610 nsn->expire == 0) { 3611 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3612 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3613 pf_status.src_nodes--; 3614 pool_put(&pf_src_tree_pl, nsn); 3615 } 3616 return (PF_DROP); 3617 } 3618 bzero(s, sizeof(*s)); 3619 s->rule.ptr = r; 3620 s->nat_rule.ptr = nr; 3621 s->anchor.ptr = a; 3622 STATE_INC_COUNTERS(s); 3623 s->allow_opts = r->allow_opts; 3624 s->log = r->log & 2; 3625 s->proto = IPPROTO_UDP; 3626 s->direction = direction; 3627 s->af = af; 3628 if (direction == PF_OUT) { 3629 PF_ACPY(&s->gwy.addr, saddr, af); 3630 s->gwy.port = uh->uh_sport; 3631 PF_ACPY(&s->ext.addr, daddr, af); 3632 s->ext.port = uh->uh_dport; 3633 if (nr != NULL) { 3634 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3635 s->lan.port = bport; 3636 } else { 3637 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3638 s->lan.port = s->gwy.port; 3639 } 3640 } else { 3641 PF_ACPY(&s->lan.addr, daddr, af); 3642 s->lan.port = uh->uh_dport; 3643 PF_ACPY(&s->ext.addr, saddr, af); 3644 s->ext.port = uh->uh_sport; 3645 if (nr != NULL) { 3646 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3647 s->gwy.port = bport; 3648 } else { 3649 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3650 s->gwy.port = s->lan.port; 3651 } 3652 } 3653 s->src.state = PFUDPS_SINGLE; 3654 s->dst.state = PFUDPS_NO_TRAFFIC; 3655 s->creation = time_second; 3656 s->expire = time_second; 3657 s->timeout = PFTM_UDP_FIRST_PACKET; 3658 pf_set_rt_ifp(s, saddr); 3659 if (sn != NULL) { 3660 s->src_node = sn; 3661 s->src_node->states++; 3662 } 3663 if (nsn != NULL) { 3664 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3665 s->nat_src_node = nsn; 3666 s->nat_src_node->states++; 3667 } 3668 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3669 REASON_SET(&reason, PFRES_STATEINS); 3670 pf_src_tree_remove_state(s); 3671 STATE_DEC_COUNTERS(s); 3672 pool_put(&pf_state_pl, s); 3673 return (PF_DROP); 3674 } else 3675 *sm = s; 3676 if (tag > 0) { 3677 pf_tag_ref(tag); 3678 s->tag = tag; 3679 } 3680 } 3681 3682 /* copy back packet headers if we performed NAT operations */ 3683 if (rewrite) 3684 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3685 3686 return (PF_PASS); 3687} 3688 3689int 3690pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 3691 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3692 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3693 struct ifqueue *ifq) 3694{ 3695 struct pf_rule *nr = NULL; 3696 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3697 struct pf_rule *r, *a = NULL; 3698 struct pf_ruleset *ruleset = NULL; 3699 struct pf_src_node *nsn = NULL; 3700 u_short reason; 3701 u_int16_t icmpid = 0, bport, nport = 0; 3702 sa_family_t af = pd->af; 3703 u_int8_t icmptype = 0; /* make the compiler happy */ 3704 u_int8_t icmpcode = 0; /* make the compiler happy */ 3705 int state_icmp = 0; 3706 struct pf_tag *pftag = NULL; 3707 int tag = -1; 3708#ifdef INET6 3709 int rewrite = 0; 3710#endif /* INET6 */ 3711 int asd = 0; 3712 3713 if (pf_check_congestion(ifq)) { 3714 REASON_SET(&reason, PFRES_CONGEST); 3715 return (PF_DROP); 3716 } 3717 3718 switch (pd->proto) { 3719#ifdef INET 3720 case IPPROTO_ICMP: 3721 icmptype = pd->hdr.icmp->icmp_type; 3722 icmpcode = pd->hdr.icmp->icmp_code; 3723 icmpid = pd->hdr.icmp->icmp_id; 3724 3725 if (icmptype == ICMP_UNREACH || 3726 icmptype == ICMP_SOURCEQUENCH || 3727 icmptype == ICMP_REDIRECT || 3728 icmptype == ICMP_TIMXCEED || 3729 icmptype == ICMP_PARAMPROB) 3730 state_icmp++; 3731 break; 3732#endif /* INET */ 3733#ifdef INET6 3734 case IPPROTO_ICMPV6: 3735 icmptype = pd->hdr.icmp6->icmp6_type; 3736 icmpcode = pd->hdr.icmp6->icmp6_code; 3737 icmpid = pd->hdr.icmp6->icmp6_id; 3738 3739 if (icmptype == ICMP6_DST_UNREACH || 3740 icmptype == ICMP6_PACKET_TOO_BIG || 3741 icmptype == ICMP6_TIME_EXCEEDED || 3742 icmptype == ICMP6_PARAM_PROB) 3743 state_icmp++; 3744 break; 3745#endif /* INET6 */ 3746 } 3747 3748 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3749 3750 if (direction == PF_OUT) { 3751 bport = nport = icmpid; 3752 /* check outgoing packet for BINAT/NAT */ 3753 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3754 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 3755 NULL) { 3756 PF_ACPY(&pd->baddr, saddr, af); 3757 switch (af) { 3758#ifdef INET 3759 case AF_INET: 3760 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3761 pd->naddr.v4.s_addr, 0); 3762 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3763 pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 3764 pd->hdr.icmp->icmp_id = nport; 3765 m_copyback(m, off, ICMP_MINLEN, 3766 (caddr_t)pd->hdr.icmp); 3767 break; 3768#endif /* INET */ 3769#ifdef INET6 3770 case AF_INET6: 3771 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3772 &pd->naddr, 0); 3773 rewrite++; 3774 break; 3775#endif /* INET6 */ 3776 } 3777 if (nr->natpass) 3778 r = NULL; 3779 pd->nat_rule = nr; 3780 } 3781 } else { 3782 bport = nport = icmpid; 3783 /* check incoming packet for BINAT/RDR */ 3784 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3785 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 3786 NULL) { 3787 PF_ACPY(&pd->baddr, daddr, af); 3788 switch (af) { 3789#ifdef INET 3790 case AF_INET: 3791 pf_change_a(&daddr->v4.s_addr, 3792 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3793 break; 3794#endif /* INET */ 3795#ifdef INET6 3796 case AF_INET6: 3797 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3798 &pd->naddr, 0); 3799 rewrite++; 3800 break; 3801#endif /* INET6 */ 3802 } 3803 if (nr->natpass) 3804 r = NULL; 3805 pd->nat_rule = nr; 3806 } 3807 } 3808 3809 while (r != NULL) { 3810 r->evaluations++; 3811 if (r->kif != NULL && 3812 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3813 r = r->skip[PF_SKIP_IFP].ptr; 3814 else if (r->direction && r->direction != direction) 3815 r = r->skip[PF_SKIP_DIR].ptr; 3816 else if (r->af && r->af != af) 3817 r = r->skip[PF_SKIP_AF].ptr; 3818 else if (r->proto && r->proto != pd->proto) 3819 r = r->skip[PF_SKIP_PROTO].ptr; 3820 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg)) 3821 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3822 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg)) 3823 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3824 else if (r->type && r->type != icmptype + 1) 3825 r = TAILQ_NEXT(r, entries); 3826 else if (r->code && r->code != icmpcode + 1) 3827 r = TAILQ_NEXT(r, entries); 3828 else if (r->tos && !(r->tos & pd->tos)) 3829 r = TAILQ_NEXT(r, entries); 3830 else if (r->rule_flag & PFRULE_FRAGMENT) 3831 r = TAILQ_NEXT(r, entries); 3832 else if (r->prob && r->prob <= arc4random()) 3833 r = TAILQ_NEXT(r, entries); 3834 else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 3835 r = TAILQ_NEXT(r, entries); 3836 else if (r->os_fingerprint != PF_OSFP_ANY) 3837 r = TAILQ_NEXT(r, entries); 3838 else { 3839 if (r->tag) 3840 tag = r->tag; 3841 if (r->anchor == NULL) { 3842 *rm = r; 3843 *am = a; 3844 *rsm = ruleset; 3845 if ((*rm)->quick) 3846 break; 3847 r = TAILQ_NEXT(r, entries); 3848 } else 3849 pf_step_into_anchor(&asd, &ruleset, 3850 PF_RULESET_FILTER, &r, &a); 3851 } 3852 if (r == NULL) 3853 pf_step_out_of_anchor(&asd, &ruleset, 3854 PF_RULESET_FILTER, &r, &a); 3855 } 3856 r = *rm; 3857 a = *am; 3858 ruleset = *rsm; 3859 3860 REASON_SET(&reason, PFRES_MATCH); 3861 3862 if (r->log) { 3863#ifdef INET6 3864 if (rewrite) 3865 m_copyback(m, off, sizeof(struct icmp6_hdr), 3866 (caddr_t)pd->hdr.icmp6); 3867#endif /* INET6 */ 3868 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3869 } 3870 3871 if (r->action != PF_PASS) 3872 return (PF_DROP); 3873 3874 if (pf_tag_packet(m, pftag, tag)) { 3875 REASON_SET(&reason, PFRES_MEMORY); 3876 return (PF_DROP); 3877 } 3878 3879 if (!state_icmp && (r->keep_state || nr != NULL)) { 3880 /* create new state */ 3881 struct pf_state *s = NULL; 3882 struct pf_src_node *sn = NULL; 3883 3884 /* check maximums */ 3885 if (r->max_states && (r->states >= r->max_states)) { 3886 pf_status.lcounters[LCNT_STATES]++; 3887 REASON_SET(&reason, PFRES_MAXSTATES); 3888 goto cleanup; 3889 } 3890 /* src node for flter rule */ 3891 if ((r->rule_flag & PFRULE_SRCTRACK || 3892 r->rpool.opts & PF_POOL_STICKYADDR) && 3893 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3894 REASON_SET(&reason, PFRES_SRCLIMIT); 3895 goto cleanup; 3896 } 3897 /* src node for translation rule */ 3898 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3899 ((direction == PF_OUT && 3900 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3901 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3902 REASON_SET(&reason, PFRES_SRCLIMIT); 3903 goto cleanup; 3904 } 3905 s = pool_get(&pf_state_pl, PR_NOWAIT); 3906 if (s == NULL) { 3907 REASON_SET(&reason, PFRES_MEMORY); 3908cleanup: 3909 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3910 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3911 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3912 pf_status.src_nodes--; 3913 pool_put(&pf_src_tree_pl, sn); 3914 } 3915 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3916 nsn->expire == 0) { 3917 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3918 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3919 pf_status.src_nodes--; 3920 pool_put(&pf_src_tree_pl, nsn); 3921 } 3922 return (PF_DROP); 3923 } 3924 bzero(s, sizeof(*s)); 3925 s->rule.ptr = r; 3926 s->nat_rule.ptr = nr; 3927 s->anchor.ptr = a; 3928 STATE_INC_COUNTERS(s); 3929 s->allow_opts = r->allow_opts; 3930 s->log = r->log & 2; 3931 s->proto = pd->proto; 3932 s->direction = direction; 3933 s->af = af; 3934 if (direction == PF_OUT) { 3935 PF_ACPY(&s->gwy.addr, saddr, af); 3936 s->gwy.port = nport; 3937 PF_ACPY(&s->ext.addr, daddr, af); 3938 s->ext.port = 0; 3939 if (nr != NULL) { 3940 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3941 s->lan.port = bport; 3942 } else { 3943 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3944 s->lan.port = s->gwy.port; 3945 } 3946 } else { 3947 PF_ACPY(&s->lan.addr, daddr, af); 3948 s->lan.port = nport; 3949 PF_ACPY(&s->ext.addr, saddr, af); 3950 s->ext.port = 0; 3951 if (nr != NULL) { 3952 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3953 s->gwy.port = bport; 3954 } else { 3955 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3956 s->gwy.port = s->lan.port; 3957 } 3958 } 3959 s->creation = time_second; 3960 s->expire = time_second; 3961 s->timeout = PFTM_ICMP_FIRST_PACKET; 3962 pf_set_rt_ifp(s, saddr); 3963 if (sn != NULL) { 3964 s->src_node = sn; 3965 s->src_node->states++; 3966 } 3967 if (nsn != NULL) { 3968 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3969 s->nat_src_node = nsn; 3970 s->nat_src_node->states++; 3971 } 3972 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3973 REASON_SET(&reason, PFRES_STATEINS); 3974 pf_src_tree_remove_state(s); 3975 STATE_DEC_COUNTERS(s); 3976 pool_put(&pf_state_pl, s); 3977 return (PF_DROP); 3978 } else 3979 *sm = s; 3980 if (tag > 0) { 3981 pf_tag_ref(tag); 3982 s->tag = tag; 3983 } 3984 } 3985 3986#ifdef INET6 3987 /* copy back packet headers if we performed IPv6 NAT operations */ 3988 if (rewrite) 3989 m_copyback(m, off, sizeof(struct icmp6_hdr), 3990 (caddr_t)pd->hdr.icmp6); 3991#endif /* INET6 */ 3992 3993 return (PF_PASS); 3994} 3995 3996int 3997pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 3998 struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3999 struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 4000{ 4001 struct pf_rule *nr = NULL; 4002 struct pf_rule *r, *a = NULL; 4003 struct pf_ruleset *ruleset = NULL; 4004 struct pf_src_node *nsn = NULL; 4005 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4006 sa_family_t af = pd->af; 4007 u_short reason; 4008 struct pf_tag *pftag = NULL; 4009 int tag = -1; 4010 int asd = 0; 4011 4012 if (pf_check_congestion(ifq)) { 4013 REASON_SET(&reason, PFRES_CONGEST); 4014 return (PF_DROP); 4015 } 4016 4017 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4018 4019 if (direction == PF_OUT) { 4020 /* check outgoing packet for BINAT/NAT */ 4021 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4022 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4023 PF_ACPY(&pd->baddr, saddr, af); 4024 switch (af) { 4025#ifdef INET 4026 case AF_INET: 4027 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4028 pd->naddr.v4.s_addr, 0); 4029 break; 4030#endif /* INET */ 4031#ifdef INET6 4032 case AF_INET6: 4033 PF_ACPY(saddr, &pd->naddr, af); 4034 break; 4035#endif /* INET6 */ 4036 } 4037 if (nr->natpass) 4038 r = NULL; 4039 pd->nat_rule = nr; 4040 } 4041 } else { 4042 /* check incoming packet for BINAT/RDR */ 4043 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4044 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4045 PF_ACPY(&pd->baddr, daddr, af); 4046 switch (af) { 4047#ifdef INET 4048 case AF_INET: 4049 pf_change_a(&daddr->v4.s_addr, 4050 pd->ip_sum, pd->naddr.v4.s_addr, 0); 4051 break; 4052#endif /* INET */ 4053#ifdef INET6 4054 case AF_INET6: 4055 PF_ACPY(daddr, &pd->naddr, af); 4056 break; 4057#endif /* INET6 */ 4058 } 4059 if (nr->natpass) 4060 r = NULL; 4061 pd->nat_rule = nr; 4062 } 4063 } 4064 4065 while (r != NULL) { 4066 r->evaluations++; 4067 if (r->kif != NULL && 4068 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 4069 r = r->skip[PF_SKIP_IFP].ptr; 4070 else if (r->direction && r->direction != direction) 4071 r = r->skip[PF_SKIP_DIR].ptr; 4072 else if (r->af && r->af != af) 4073 r = r->skip[PF_SKIP_AF].ptr; 4074 else if (r->proto && r->proto != pd->proto) 4075 r = r->skip[PF_SKIP_PROTO].ptr; 4076 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg)) 4077 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4078 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg)) 4079 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4080 else if (r->tos && !(r->tos & pd->tos)) 4081 r = TAILQ_NEXT(r, entries); 4082 else if (r->rule_flag & PFRULE_FRAGMENT) 4083 r = TAILQ_NEXT(r, entries); 4084 else if (r->prob && r->prob <= arc4random()) 4085 r = TAILQ_NEXT(r, entries); 4086 else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 4087 r = TAILQ_NEXT(r, entries); 4088 else if (r->os_fingerprint != PF_OSFP_ANY) 4089 r = TAILQ_NEXT(r, entries); 4090 else { 4091 if (r->tag) 4092 tag = r->tag; 4093 if (r->anchor == NULL) { 4094 *rm = r; 4095 *am = a; 4096 *rsm = ruleset; 4097 if ((*rm)->quick) 4098 break; 4099 r = TAILQ_NEXT(r, entries); 4100 } else 4101 pf_step_into_anchor(&asd, &ruleset, 4102 PF_RULESET_FILTER, &r, &a); 4103 } 4104 if (r == NULL) 4105 pf_step_out_of_anchor(&asd, &ruleset, 4106 PF_RULESET_FILTER, &r, &a); 4107 } 4108 r = *rm; 4109 a = *am; 4110 ruleset = *rsm; 4111 4112 REASON_SET(&reason, PFRES_MATCH); 4113 4114 if (r->log) 4115 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 4116 4117 if ((r->action == PF_DROP) && 4118 ((r->rule_flag & PFRULE_RETURNICMP) || 4119 (r->rule_flag & PFRULE_RETURN))) { 4120 struct pf_addr *a = NULL; 4121 4122 if (nr != NULL) { 4123 if (direction == PF_OUT) 4124 a = saddr; 4125 else 4126 a = daddr; 4127 } 4128 if (a != NULL) { 4129 switch (af) { 4130#ifdef INET 4131 case AF_INET: 4132 pf_change_a(&a->v4.s_addr, pd->ip_sum, 4133 pd->baddr.v4.s_addr, 0); 4134 break; 4135#endif /* INET */ 4136#ifdef INET6 4137 case AF_INET6: 4138 PF_ACPY(a, &pd->baddr, af); 4139 break; 4140#endif /* INET6 */ 4141 } 4142 } 4143 if ((af == AF_INET) && r->return_icmp) 4144 pf_send_icmp(m, r->return_icmp >> 8, 4145 r->return_icmp & 255, af, r); 4146 else if ((af == AF_INET6) && r->return_icmp6) 4147 pf_send_icmp(m, r->return_icmp6 >> 8, 4148 r->return_icmp6 & 255, af, r); 4149 } 4150 4151 if (r->action != PF_PASS) 4152 return (PF_DROP); 4153 4154 if (pf_tag_packet(m, pftag, tag)) { 4155 REASON_SET(&reason, PFRES_MEMORY); 4156 return (PF_DROP); 4157 } 4158 4159 if (r->keep_state || nr != NULL) { 4160 /* create new state */ 4161 struct pf_state *s = NULL; 4162 struct pf_src_node *sn = NULL; 4163 4164 /* check maximums */ 4165 if (r->max_states && (r->states >= r->max_states)) { 4166 pf_status.lcounters[LCNT_STATES]++; 4167 REASON_SET(&reason, PFRES_MAXSTATES); 4168 goto cleanup; 4169 } 4170 /* src node for flter rule */ 4171 if ((r->rule_flag & PFRULE_SRCTRACK || 4172 r->rpool.opts & PF_POOL_STICKYADDR) && 4173 pf_insert_src_node(&sn, r, saddr, af) != 0) { 4174 REASON_SET(&reason, PFRES_SRCLIMIT); 4175 goto cleanup; 4176 } 4177 /* src node for translation rule */ 4178 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4179 ((direction == PF_OUT && 4180 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4181 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4182 REASON_SET(&reason, PFRES_SRCLIMIT); 4183 goto cleanup; 4184 } 4185 s = pool_get(&pf_state_pl, PR_NOWAIT); 4186 if (s == NULL) { 4187 REASON_SET(&reason, PFRES_MEMORY); 4188cleanup: 4189 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4190 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4191 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4192 pf_status.src_nodes--; 4193 pool_put(&pf_src_tree_pl, sn); 4194 } 4195 if (nsn != sn && nsn != NULL && nsn->states == 0 && 4196 nsn->expire == 0) { 4197 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4198 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4199 pf_status.src_nodes--; 4200 pool_put(&pf_src_tree_pl, nsn); 4201 } 4202 return (PF_DROP); 4203 } 4204 bzero(s, sizeof(*s)); 4205 s->rule.ptr = r; 4206 s->nat_rule.ptr = nr; 4207 s->anchor.ptr = a; 4208 STATE_INC_COUNTERS(s); 4209 s->allow_opts = r->allow_opts; 4210 s->log = r->log & 2; 4211 s->proto = pd->proto; 4212 s->direction = direction; 4213 s->af = af; 4214 if (direction == PF_OUT) { 4215 PF_ACPY(&s->gwy.addr, saddr, af); 4216 PF_ACPY(&s->ext.addr, daddr, af); 4217 if (nr != NULL) 4218 PF_ACPY(&s->lan.addr, &pd->baddr, af); 4219 else 4220 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4221 } else { 4222 PF_ACPY(&s->lan.addr, daddr, af); 4223 PF_ACPY(&s->ext.addr, saddr, af); 4224 if (nr != NULL) 4225 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4226 else 4227 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4228 } 4229 s->src.state = PFOTHERS_SINGLE; 4230 s->dst.state = PFOTHERS_NO_TRAFFIC; 4231 s->creation = time_second; 4232 s->expire = time_second; 4233 s->timeout = PFTM_OTHER_FIRST_PACKET; 4234 pf_set_rt_ifp(s, saddr); 4235 if (sn != NULL) { 4236 s->src_node = sn; 4237 s->src_node->states++; 4238 } 4239 if (nsn != NULL) { 4240 PF_ACPY(&nsn->raddr, &pd->naddr, af); 4241 s->nat_src_node = nsn; 4242 s->nat_src_node->states++; 4243 } 4244 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4245 REASON_SET(&reason, PFRES_STATEINS); 4246 pf_src_tree_remove_state(s); 4247 STATE_DEC_COUNTERS(s); 4248 pool_put(&pf_state_pl, s); 4249 return (PF_DROP); 4250 } else 4251 *sm = s; 4252 if (tag > 0) { 4253 pf_tag_ref(tag); 4254 s->tag = tag; 4255 } 4256 } 4257 4258 return (PF_PASS); 4259} 4260 4261int 4262pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4263 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4264 struct pf_ruleset **rsm) 4265{ 4266 struct pf_rule *r, *a = NULL; 4267 struct pf_ruleset *ruleset = NULL; 4268 sa_family_t af = pd->af; 4269 u_short reason; 4270 struct pf_tag *pftag = NULL; 4271 int tag = -1; 4272 int asd = 0; 4273 4274 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4275 while (r != NULL) { 4276 r->evaluations++; 4277 if (r->kif != NULL && 4278 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 4279 r = r->skip[PF_SKIP_IFP].ptr; 4280 else if (r->direction && r->direction != direction) 4281 r = r->skip[PF_SKIP_DIR].ptr; 4282 else if (r->af && r->af != af) 4283 r = r->skip[PF_SKIP_AF].ptr; 4284 else if (r->proto && r->proto != pd->proto) 4285 r = r->skip[PF_SKIP_PROTO].ptr; 4286 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg)) 4287 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4288 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg)) 4289 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4290 else if (r->tos && !(r->tos & pd->tos)) 4291 r = TAILQ_NEXT(r, entries); 4292 else if (r->src.port_op || r->dst.port_op || 4293 r->flagset || r->type || r->code || 4294 r->os_fingerprint != PF_OSFP_ANY) 4295 r = TAILQ_NEXT(r, entries); 4296 else if (r->prob && r->prob <= arc4random()) 4297 r = TAILQ_NEXT(r, entries); 4298 else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag)) 4299 r = TAILQ_NEXT(r, entries); 4300 else { 4301 if (r->anchor == NULL) { 4302 *rm = r; 4303 *am = a; 4304 *rsm = ruleset; 4305 if ((*rm)->quick) 4306 break; 4307 r = TAILQ_NEXT(r, entries); 4308 } else 4309 pf_step_into_anchor(&asd, &ruleset, 4310 PF_RULESET_FILTER, &r, &a); 4311 } 4312 if (r == NULL) 4313 pf_step_out_of_anchor(&asd, &ruleset, 4314 PF_RULESET_FILTER, &r, &a); 4315 } 4316 r = *rm; 4317 a = *am; 4318 ruleset = *rsm; 4319 4320 REASON_SET(&reason, PFRES_MATCH); 4321 4322 if (r->log) 4323 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 4324 4325 if (r->action != PF_PASS) 4326 return (PF_DROP); 4327 4328 if (pf_tag_packet(m, pftag, tag)) { 4329 REASON_SET(&reason, PFRES_MEMORY); 4330 return (PF_DROP); 4331 } 4332 4333 return (PF_PASS); 4334} 4335 4336int 4337pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4338 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4339 u_short *reason) 4340{ 4341 struct pf_state key; 4342 struct tcphdr *th = pd->hdr.tcp; 4343 u_int16_t win = ntohs(th->th_win); 4344 u_int32_t ack, end, seq, orig_seq; 4345 u_int8_t sws, dws; 4346 int ackskew; 4347 int copyback = 0; 4348 struct pf_state_peer *src, *dst; 4349 4350 key.af = pd->af; 4351 key.proto = IPPROTO_TCP; 4352 if (direction == PF_IN) { 4353 PF_ACPY(&key.ext.addr, pd->src, key.af); 4354 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4355 key.ext.port = th->th_sport; 4356 key.gwy.port = th->th_dport; 4357 } else { 4358 PF_ACPY(&key.lan.addr, pd->src, key.af); 4359 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4360 key.lan.port = th->th_sport; 4361 key.ext.port = th->th_dport; 4362 } 4363 4364 STATE_LOOKUP(); 4365 4366 if (direction == (*state)->direction) { 4367 src = &(*state)->src; 4368 dst = &(*state)->dst; 4369 } else { 4370 src = &(*state)->dst; 4371 dst = &(*state)->src; 4372 } 4373 4374 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4375 if (direction != (*state)->direction) { 4376 REASON_SET(reason, PFRES_SYNPROXY); 4377 return (PF_SYNPROXY_DROP); 4378 } 4379 if (th->th_flags & TH_SYN) { 4380 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4381 REASON_SET(reason, PFRES_SYNPROXY); 4382 return (PF_DROP); 4383 } 4384#ifdef __FreeBSD__ 4385 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4386#else 4387 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4388#endif 4389 pd->src, th->th_dport, th->th_sport, 4390 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4391 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4392 NULL, NULL); 4393 REASON_SET(reason, PFRES_SYNPROXY); 4394 return (PF_SYNPROXY_DROP); 4395 } else if (!(th->th_flags & TH_ACK) || 4396 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4397 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4398 REASON_SET(reason, PFRES_SYNPROXY); 4399 return (PF_DROP); 4400 } else if ((*state)->src_node != NULL && 4401 pf_src_connlimit(state)) { 4402 REASON_SET(reason, PFRES_SRCLIMIT); 4403 return (PF_DROP); 4404 } else 4405 (*state)->src.state = PF_TCPS_PROXY_DST; 4406 } 4407 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4408 struct pf_state_host *src, *dst; 4409 4410 if (direction == PF_OUT) { 4411 src = &(*state)->gwy; 4412 dst = &(*state)->ext; 4413 } else { 4414 src = &(*state)->ext; 4415 dst = &(*state)->lan; 4416 } 4417 if (direction == (*state)->direction) { 4418 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4419 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4420 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4421 REASON_SET(reason, PFRES_SYNPROXY); 4422 return (PF_DROP); 4423 } 4424 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4425 if ((*state)->dst.seqhi == 1) 4426 (*state)->dst.seqhi = htonl(arc4random()); 4427#ifdef __FreeBSD__ 4428 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4429 &src->addr, 4430#else 4431 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4432#endif 4433 &dst->addr, src->port, dst->port, 4434 (*state)->dst.seqhi, 0, TH_SYN, 0, 4435 (*state)->src.mss, 0, 0, NULL, NULL); 4436 REASON_SET(reason, PFRES_SYNPROXY); 4437 return (PF_SYNPROXY_DROP); 4438 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4439 (TH_SYN|TH_ACK)) || 4440 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4441 REASON_SET(reason, PFRES_SYNPROXY); 4442 return (PF_DROP); 4443 } else { 4444 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4445 (*state)->dst.seqlo = ntohl(th->th_seq); 4446#ifdef __FreeBSD__ 4447 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4448#else 4449 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4450#endif 4451 pd->src, th->th_dport, th->th_sport, 4452 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4453 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4454 NULL, NULL); 4455#ifdef __FreeBSD__ 4456 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4457 &src->addr, 4458#else 4459 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4460#endif 4461 &dst->addr, src->port, dst->port, 4462 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4463 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4464 NULL, NULL); 4465 (*state)->src.seqdiff = (*state)->dst.seqhi - 4466 (*state)->src.seqlo; 4467 (*state)->dst.seqdiff = (*state)->src.seqhi - 4468 (*state)->dst.seqlo; 4469 (*state)->src.seqhi = (*state)->src.seqlo + 4470 (*state)->dst.max_win; 4471 (*state)->dst.seqhi = (*state)->dst.seqlo + 4472 (*state)->src.max_win; 4473 (*state)->src.wscale = (*state)->dst.wscale = 0; 4474 (*state)->src.state = (*state)->dst.state = 4475 TCPS_ESTABLISHED; 4476 REASON_SET(reason, PFRES_SYNPROXY); 4477 return (PF_SYNPROXY_DROP); 4478 } 4479 } 4480 4481 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4482 sws = src->wscale & PF_WSCALE_MASK; 4483 dws = dst->wscale & PF_WSCALE_MASK; 4484 } else 4485 sws = dws = 0; 4486 4487 /* 4488 * Sequence tracking algorithm from Guido van Rooij's paper: 4489 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4490 * tcp_filtering.ps 4491 */ 4492 4493 orig_seq = seq = ntohl(th->th_seq); 4494 if (src->seqlo == 0) { 4495 /* First packet from this end. Set its state */ 4496 4497 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4498 src->scrub == NULL) { 4499 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4500 REASON_SET(reason, PFRES_MEMORY); 4501 return (PF_DROP); 4502 } 4503 } 4504 4505 /* Deferred generation of sequence number modulator */ 4506 if (dst->seqdiff && !src->seqdiff) { 4507 while ((src->seqdiff = htonl(arc4random())) == 0) 4508 ; 4509 ack = ntohl(th->th_ack) - dst->seqdiff; 4510 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4511 src->seqdiff), 0); 4512 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4513 copyback = 1; 4514 } else { 4515 ack = ntohl(th->th_ack); 4516 } 4517 4518 end = seq + pd->p_len; 4519 if (th->th_flags & TH_SYN) { 4520 end++; 4521 if (dst->wscale & PF_WSCALE_FLAG) { 4522 src->wscale = pf_get_wscale(m, off, th->th_off, 4523 pd->af); 4524 if (src->wscale & PF_WSCALE_FLAG) { 4525 /* Remove scale factor from initial 4526 * window */ 4527 sws = src->wscale & PF_WSCALE_MASK; 4528 win = ((u_int32_t)win + (1 << sws) - 1) 4529 >> sws; 4530 dws = dst->wscale & PF_WSCALE_MASK; 4531 } else { 4532 /* fixup other window */ 4533 dst->max_win <<= dst->wscale & 4534 PF_WSCALE_MASK; 4535 /* in case of a retrans SYN|ACK */ 4536 dst->wscale = 0; 4537 } 4538 } 4539 } 4540 if (th->th_flags & TH_FIN) 4541 end++; 4542 4543 src->seqlo = seq; 4544 if (src->state < TCPS_SYN_SENT) 4545 src->state = TCPS_SYN_SENT; 4546 4547 /* 4548 * May need to slide the window (seqhi may have been set by 4549 * the crappy stack check or if we picked up the connection 4550 * after establishment) 4551 */ 4552 if (src->seqhi == 1 || 4553 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4554 src->seqhi = end + MAX(1, dst->max_win << dws); 4555 if (win > src->max_win) 4556 src->max_win = win; 4557 4558 } else { 4559 ack = ntohl(th->th_ack) - dst->seqdiff; 4560 if (src->seqdiff) { 4561 /* Modulate sequence numbers */ 4562 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4563 src->seqdiff), 0); 4564 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4565 copyback = 1; 4566 } 4567 end = seq + pd->p_len; 4568 if (th->th_flags & TH_SYN) 4569 end++; 4570 if (th->th_flags & TH_FIN) 4571 end++; 4572 } 4573 4574 if ((th->th_flags & TH_ACK) == 0) { 4575 /* Let it pass through the ack skew check */ 4576 ack = dst->seqlo; 4577 } else if ((ack == 0 && 4578 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4579 /* broken tcp stacks do not set ack */ 4580 (dst->state < TCPS_SYN_SENT)) { 4581 /* 4582 * Many stacks (ours included) will set the ACK number in an 4583 * FIN|ACK if the SYN times out -- no sequence to ACK. 4584 */ 4585 ack = dst->seqlo; 4586 } 4587 4588 if (seq == end) { 4589 /* Ease sequencing restrictions on no data packets */ 4590 seq = src->seqlo; 4591 end = seq; 4592 } 4593 4594 ackskew = dst->seqlo - ack; 4595 4596#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4597 if (SEQ_GEQ(src->seqhi, end) && 4598 /* Last octet inside other's window space */ 4599 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4600 /* Retrans: not more than one window back */ 4601 (ackskew >= -MAXACKWINDOW) && 4602 /* Acking not more than one reassembled fragment backwards */ 4603 (ackskew <= (MAXACKWINDOW << sws)) && 4604 /* Acking not more than one window forward */ 4605 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4606 (pd->flags & PFDESC_IP_REAS) == 0)) { 4607 /* Require an exact sequence match on resets when possible */ 4608 4609 if (dst->scrub || src->scrub) { 4610 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4611 *state, src, dst, ©back)) 4612 return (PF_DROP); 4613 } 4614 4615 /* update max window */ 4616 if (src->max_win < win) 4617 src->max_win = win; 4618 /* synchronize sequencing */ 4619 if (SEQ_GT(end, src->seqlo)) 4620 src->seqlo = end; 4621 /* slide the window of what the other end can send */ 4622 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4623 dst->seqhi = ack + MAX((win << sws), 1); 4624 4625 4626 /* update states */ 4627 if (th->th_flags & TH_SYN) 4628 if (src->state < TCPS_SYN_SENT) 4629 src->state = TCPS_SYN_SENT; 4630 if (th->th_flags & TH_FIN) 4631 if (src->state < TCPS_CLOSING) 4632 src->state = TCPS_CLOSING; 4633 if (th->th_flags & TH_ACK) { 4634 if (dst->state == TCPS_SYN_SENT) { 4635 dst->state = TCPS_ESTABLISHED; 4636 if (src->state == TCPS_ESTABLISHED && 4637 (*state)->src_node != NULL && 4638 pf_src_connlimit(state)) { 4639 REASON_SET(reason, PFRES_SRCLIMIT); 4640 return (PF_DROP); 4641 } 4642 } else if (dst->state == TCPS_CLOSING) 4643 dst->state = TCPS_FIN_WAIT_2; 4644 } 4645 if (th->th_flags & TH_RST) 4646 src->state = dst->state = TCPS_TIME_WAIT; 4647 4648 /* update expire time */ 4649 (*state)->expire = time_second; 4650 if (src->state >= TCPS_FIN_WAIT_2 && 4651 dst->state >= TCPS_FIN_WAIT_2) 4652 (*state)->timeout = PFTM_TCP_CLOSED; 4653 else if (src->state >= TCPS_FIN_WAIT_2 || 4654 dst->state >= TCPS_FIN_WAIT_2) 4655 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4656 else if (src->state < TCPS_ESTABLISHED || 4657 dst->state < TCPS_ESTABLISHED) 4658 (*state)->timeout = PFTM_TCP_OPENING; 4659 else if (src->state >= TCPS_CLOSING || 4660 dst->state >= TCPS_CLOSING) 4661 (*state)->timeout = PFTM_TCP_CLOSING; 4662 else 4663 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4664 4665 /* Fall through to PASS packet */ 4666 4667 } else if ((dst->state < TCPS_SYN_SENT || 4668 dst->state >= TCPS_FIN_WAIT_2 || 4669 src->state >= TCPS_FIN_WAIT_2) && 4670 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4671 /* Within a window forward of the originating packet */ 4672 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4673 /* Within a window backward of the originating packet */ 4674 4675 /* 4676 * This currently handles three situations: 4677 * 1) Stupid stacks will shotgun SYNs before their peer 4678 * replies. 4679 * 2) When PF catches an already established stream (the 4680 * firewall rebooted, the state table was flushed, routes 4681 * changed...) 4682 * 3) Packets get funky immediately after the connection 4683 * closes (this should catch Solaris spurious ACK|FINs 4684 * that web servers like to spew after a close) 4685 * 4686 * This must be a little more careful than the above code 4687 * since packet floods will also be caught here. We don't 4688 * update the TTL here to mitigate the damage of a packet 4689 * flood and so the same code can handle awkward establishment 4690 * and a loosened connection close. 4691 * In the establishment case, a correct peer response will 4692 * validate the connection, go through the normal state code 4693 * and keep updating the state TTL. 4694 */ 4695 4696 if (pf_status.debug >= PF_DEBUG_MISC) { 4697 printf("pf: loose state match: "); 4698 pf_print_state(*state); 4699 pf_print_flags(th->th_flags); 4700 printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n", 4701 seq, ack, pd->p_len, ackskew, 4702 (*state)->packets[0], (*state)->packets[1]); 4703 } 4704 4705 if (dst->scrub || src->scrub) { 4706 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4707 *state, src, dst, ©back)) 4708 return (PF_DROP); 4709 } 4710 4711 /* update max window */ 4712 if (src->max_win < win) 4713 src->max_win = win; 4714 /* synchronize sequencing */ 4715 if (SEQ_GT(end, src->seqlo)) 4716 src->seqlo = end; 4717 /* slide the window of what the other end can send */ 4718 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4719 dst->seqhi = ack + MAX((win << sws), 1); 4720 4721 /* 4722 * Cannot set dst->seqhi here since this could be a shotgunned 4723 * SYN and not an already established connection. 4724 */ 4725 4726 if (th->th_flags & TH_FIN) 4727 if (src->state < TCPS_CLOSING) 4728 src->state = TCPS_CLOSING; 4729 if (th->th_flags & TH_RST) 4730 src->state = dst->state = TCPS_TIME_WAIT; 4731 4732 /* Fall through to PASS packet */ 4733 4734 } else { 4735 if ((*state)->dst.state == TCPS_SYN_SENT && 4736 (*state)->src.state == TCPS_SYN_SENT) { 4737 /* Send RST for state mismatches during handshake */ 4738 if (!(th->th_flags & TH_RST)) 4739#ifdef __FreeBSD__ 4740 pf_send_tcp(m, (*state)->rule.ptr, pd->af, 4741#else 4742 pf_send_tcp((*state)->rule.ptr, pd->af, 4743#endif 4744 pd->dst, pd->src, th->th_dport, 4745 th->th_sport, ntohl(th->th_ack), 0, 4746 TH_RST, 0, 0, 4747 (*state)->rule.ptr->return_ttl, 1, 4748 pd->eh, kif->pfik_ifp); 4749 src->seqlo = 0; 4750 src->seqhi = 1; 4751 src->max_win = 1; 4752 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4753 printf("pf: BAD state: "); 4754 pf_print_state(*state); 4755 pf_print_flags(th->th_flags); 4756 printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d " 4757 "dir=%s,%s\n", seq, ack, pd->p_len, ackskew, 4758 (*state)->packets[0], (*state)->packets[1], 4759 direction == PF_IN ? "in" : "out", 4760 direction == (*state)->direction ? "fwd" : "rev"); 4761 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4762 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4763 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4764 ' ': '2', 4765 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4766 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4767 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4768 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4769 } 4770 REASON_SET(reason, PFRES_BADSTATE); 4771 return (PF_DROP); 4772 } 4773 4774 /* Any packets which have gotten here are to be passed */ 4775 4776 /* translate source/destination address, if necessary */ 4777 if (STATE_TRANSLATE(*state)) { 4778 if (direction == PF_OUT) 4779 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4780 &th->th_sum, &(*state)->gwy.addr, 4781 (*state)->gwy.port, 0, pd->af); 4782 else 4783 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4784 &th->th_sum, &(*state)->lan.addr, 4785 (*state)->lan.port, 0, pd->af); 4786 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4787 } else if (copyback) { 4788 /* Copyback sequence modulation or stateful scrub changes */ 4789 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4790 } 4791 4792 return (PF_PASS); 4793} 4794 4795int 4796pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4797 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4798{ 4799 struct pf_state_peer *src, *dst; 4800 struct pf_state key; 4801 struct udphdr *uh = pd->hdr.udp; 4802 4803 key.af = pd->af; 4804 key.proto = IPPROTO_UDP; 4805 if (direction == PF_IN) { 4806 PF_ACPY(&key.ext.addr, pd->src, key.af); 4807 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4808 key.ext.port = uh->uh_sport; 4809 key.gwy.port = uh->uh_dport; 4810 } else { 4811 PF_ACPY(&key.lan.addr, pd->src, key.af); 4812 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4813 key.lan.port = uh->uh_sport; 4814 key.ext.port = uh->uh_dport; 4815 } 4816 4817 STATE_LOOKUP(); 4818 4819 if (direction == (*state)->direction) { 4820 src = &(*state)->src; 4821 dst = &(*state)->dst; 4822 } else { 4823 src = &(*state)->dst; 4824 dst = &(*state)->src; 4825 } 4826 4827 /* update states */ 4828 if (src->state < PFUDPS_SINGLE) 4829 src->state = PFUDPS_SINGLE; 4830 if (dst->state == PFUDPS_SINGLE) 4831 dst->state = PFUDPS_MULTIPLE; 4832 4833 /* update expire time */ 4834 (*state)->expire = time_second; 4835 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4836 (*state)->timeout = PFTM_UDP_MULTIPLE; 4837 else 4838 (*state)->timeout = PFTM_UDP_SINGLE; 4839 4840 /* translate source/destination address, if necessary */ 4841 if (STATE_TRANSLATE(*state)) { 4842 if (direction == PF_OUT) 4843 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4844 &uh->uh_sum, &(*state)->gwy.addr, 4845 (*state)->gwy.port, 1, pd->af); 4846 else 4847 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4848 &uh->uh_sum, &(*state)->lan.addr, 4849 (*state)->lan.port, 1, pd->af); 4850 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4851 } 4852 4853 return (PF_PASS); 4854} 4855 4856int 4857pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4858 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4859{ 4860 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4861 u_int16_t icmpid = 0; /* make the compiler happy */ 4862 u_int16_t *icmpsum = NULL; /* make the compiler happy */ 4863 u_int8_t icmptype = 0; /* make the compiler happy */ 4864 int state_icmp = 0; 4865 4866 switch (pd->proto) { 4867#ifdef INET 4868 case IPPROTO_ICMP: 4869 icmptype = pd->hdr.icmp->icmp_type; 4870 icmpid = pd->hdr.icmp->icmp_id; 4871 icmpsum = &pd->hdr.icmp->icmp_cksum; 4872 4873 if (icmptype == ICMP_UNREACH || 4874 icmptype == ICMP_SOURCEQUENCH || 4875 icmptype == ICMP_REDIRECT || 4876 icmptype == ICMP_TIMXCEED || 4877 icmptype == ICMP_PARAMPROB) 4878 state_icmp++; 4879 break; 4880#endif /* INET */ 4881#ifdef INET6 4882 case IPPROTO_ICMPV6: 4883 icmptype = pd->hdr.icmp6->icmp6_type; 4884 icmpid = pd->hdr.icmp6->icmp6_id; 4885 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4886 4887 if (icmptype == ICMP6_DST_UNREACH || 4888 icmptype == ICMP6_PACKET_TOO_BIG || 4889 icmptype == ICMP6_TIME_EXCEEDED || 4890 icmptype == ICMP6_PARAM_PROB) 4891 state_icmp++; 4892 break; 4893#endif /* INET6 */ 4894 } 4895 4896 if (!state_icmp) { 4897 4898 /* 4899 * ICMP query/reply message not related to a TCP/UDP packet. 4900 * Search for an ICMP state. 4901 */ 4902 struct pf_state key; 4903 4904 key.af = pd->af; 4905 key.proto = pd->proto; 4906 if (direction == PF_IN) { 4907 PF_ACPY(&key.ext.addr, pd->src, key.af); 4908 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4909 key.ext.port = 0; 4910 key.gwy.port = icmpid; 4911 } else { 4912 PF_ACPY(&key.lan.addr, pd->src, key.af); 4913 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4914 key.lan.port = icmpid; 4915 key.ext.port = 0; 4916 } 4917 4918 STATE_LOOKUP(); 4919 4920 (*state)->expire = time_second; 4921 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4922 4923 /* translate source/destination address, if necessary */ 4924 if (STATE_TRANSLATE(*state)) { 4925 if (direction == PF_OUT) { 4926 switch (pd->af) { 4927#ifdef INET 4928 case AF_INET: 4929 pf_change_a(&saddr->v4.s_addr, 4930 pd->ip_sum, 4931 (*state)->gwy.addr.v4.s_addr, 0); 4932 pd->hdr.icmp->icmp_cksum = 4933 pf_cksum_fixup( 4934 pd->hdr.icmp->icmp_cksum, icmpid, 4935 (*state)->gwy.port, 0); 4936 pd->hdr.icmp->icmp_id = 4937 (*state)->gwy.port; 4938 m_copyback(m, off, ICMP_MINLEN, 4939 (caddr_t)pd->hdr.icmp); 4940 break; 4941#endif /* INET */ 4942#ifdef INET6 4943 case AF_INET6: 4944 pf_change_a6(saddr, 4945 &pd->hdr.icmp6->icmp6_cksum, 4946 &(*state)->gwy.addr, 0); 4947 m_copyback(m, off, 4948 sizeof(struct icmp6_hdr), 4949 (caddr_t)pd->hdr.icmp6); 4950 break; 4951#endif /* INET6 */ 4952 } 4953 } else { 4954 switch (pd->af) { 4955#ifdef INET 4956 case AF_INET: 4957 pf_change_a(&daddr->v4.s_addr, 4958 pd->ip_sum, 4959 (*state)->lan.addr.v4.s_addr, 0); 4960 pd->hdr.icmp->icmp_cksum = 4961 pf_cksum_fixup( 4962 pd->hdr.icmp->icmp_cksum, icmpid, 4963 (*state)->lan.port, 0); 4964 pd->hdr.icmp->icmp_id = 4965 (*state)->lan.port; 4966 m_copyback(m, off, ICMP_MINLEN, 4967 (caddr_t)pd->hdr.icmp); 4968 break; 4969#endif /* INET */ 4970#ifdef INET6 4971 case AF_INET6: 4972 pf_change_a6(daddr, 4973 &pd->hdr.icmp6->icmp6_cksum, 4974 &(*state)->lan.addr, 0); 4975 m_copyback(m, off, 4976 sizeof(struct icmp6_hdr), 4977 (caddr_t)pd->hdr.icmp6); 4978 break; 4979#endif /* INET6 */ 4980 } 4981 } 4982 } 4983 4984 return (PF_PASS); 4985 4986 } else { 4987 /* 4988 * ICMP error message in response to a TCP/UDP packet. 4989 * Extract the inner TCP/UDP header and search for that state. 4990 */ 4991 4992 struct pf_pdesc pd2; 4993#ifdef INET 4994 struct ip h2; 4995#endif /* INET */ 4996#ifdef INET6 4997 struct ip6_hdr h2_6; 4998 int terminal = 0; 4999#endif /* INET6 */ 5000 int ipoff2 = 0; /* make the compiler happy */ 5001 int off2 = 0; /* make the compiler happy */ 5002 5003 pd2.af = pd->af; 5004 switch (pd->af) { 5005#ifdef INET 5006 case AF_INET: 5007 /* offset of h2 in mbuf chain */ 5008 ipoff2 = off + ICMP_MINLEN; 5009 5010 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5011 NULL, reason, pd2.af)) { 5012 DPFPRINTF(PF_DEBUG_MISC, 5013 ("pf: ICMP error message too short " 5014 "(ip)\n")); 5015 return (PF_DROP); 5016 } 5017 /* 5018 * ICMP error messages don't refer to non-first 5019 * fragments 5020 */ 5021 if (h2.ip_off & htons(IP_OFFMASK)) { 5022 REASON_SET(reason, PFRES_FRAG); 5023 return (PF_DROP); 5024 } 5025 5026 /* offset of protocol header that follows h2 */ 5027 off2 = ipoff2 + (h2.ip_hl << 2); 5028 5029 pd2.proto = h2.ip_p; 5030 pd2.src = (struct pf_addr *)&h2.ip_src; 5031 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5032 pd2.ip_sum = &h2.ip_sum; 5033 break; 5034#endif /* INET */ 5035#ifdef INET6 5036 case AF_INET6: 5037 ipoff2 = off + sizeof(struct icmp6_hdr); 5038 5039 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5040 NULL, reason, pd2.af)) { 5041 DPFPRINTF(PF_DEBUG_MISC, 5042 ("pf: ICMP error message too short " 5043 "(ip6)\n")); 5044 return (PF_DROP); 5045 } 5046 pd2.proto = h2_6.ip6_nxt; 5047 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5048 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5049 pd2.ip_sum = NULL; 5050 off2 = ipoff2 + sizeof(h2_6); 5051 do { 5052 switch (pd2.proto) { 5053 case IPPROTO_FRAGMENT: 5054 /* 5055 * ICMPv6 error messages for 5056 * non-first fragments 5057 */ 5058 REASON_SET(reason, PFRES_FRAG); 5059 return (PF_DROP); 5060 case IPPROTO_AH: 5061 case IPPROTO_HOPOPTS: 5062 case IPPROTO_ROUTING: 5063 case IPPROTO_DSTOPTS: { 5064 /* get next header and header length */ 5065 struct ip6_ext opt6; 5066 5067 if (!pf_pull_hdr(m, off2, &opt6, 5068 sizeof(opt6), NULL, reason, 5069 pd2.af)) { 5070 DPFPRINTF(PF_DEBUG_MISC, 5071 ("pf: ICMPv6 short opt\n")); 5072 return (PF_DROP); 5073 } 5074 if (pd2.proto == IPPROTO_AH) 5075 off2 += (opt6.ip6e_len + 2) * 4; 5076 else 5077 off2 += (opt6.ip6e_len + 1) * 8; 5078 pd2.proto = opt6.ip6e_nxt; 5079 /* goto the next header */ 5080 break; 5081 } 5082 default: 5083 terminal++; 5084 break; 5085 } 5086 } while (!terminal); 5087 break; 5088#endif /* INET6 */ 5089 } 5090 5091 switch (pd2.proto) { 5092 case IPPROTO_TCP: { 5093 struct tcphdr th; 5094 u_int32_t seq; 5095 struct pf_state key; 5096 struct pf_state_peer *src, *dst; 5097 u_int8_t dws; 5098 int copyback = 0; 5099 5100 /* 5101 * Only the first 8 bytes of the TCP header can be 5102 * expected. Don't access any TCP header fields after 5103 * th_seq, an ackskew test is not possible. 5104 */ 5105 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5106 pd2.af)) { 5107 DPFPRINTF(PF_DEBUG_MISC, 5108 ("pf: ICMP error message too short " 5109 "(tcp)\n")); 5110 return (PF_DROP); 5111 } 5112 5113 key.af = pd2.af; 5114 key.proto = IPPROTO_TCP; 5115 if (direction == PF_IN) { 5116 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5117 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5118 key.ext.port = th.th_dport; 5119 key.gwy.port = th.th_sport; 5120 } else { 5121 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5122 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5123 key.lan.port = th.th_dport; 5124 key.ext.port = th.th_sport; 5125 } 5126 5127 STATE_LOOKUP(); 5128 5129 if (direction == (*state)->direction) { 5130 src = &(*state)->dst; 5131 dst = &(*state)->src; 5132 } else { 5133 src = &(*state)->src; 5134 dst = &(*state)->dst; 5135 } 5136 5137 if (src->wscale && dst->wscale && 5138 !(th.th_flags & TH_SYN)) 5139 dws = dst->wscale & PF_WSCALE_MASK; 5140 else 5141 dws = 0; 5142 5143 /* Demodulate sequence number */ 5144 seq = ntohl(th.th_seq) - src->seqdiff; 5145 if (src->seqdiff) { 5146 pf_change_a(&th.th_seq, icmpsum, 5147 htonl(seq), 0); 5148 copyback = 1; 5149 } 5150 5151 if (!SEQ_GEQ(src->seqhi, seq) || 5152 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 5153 if (pf_status.debug >= PF_DEBUG_MISC) { 5154 printf("pf: BAD ICMP %d:%d ", 5155 icmptype, pd->hdr.icmp->icmp_code); 5156 pf_print_host(pd->src, 0, pd->af); 5157 printf(" -> "); 5158 pf_print_host(pd->dst, 0, pd->af); 5159 printf(" state: "); 5160 pf_print_state(*state); 5161 printf(" seq=%u\n", seq); 5162 } 5163 REASON_SET(reason, PFRES_BADSTATE); 5164 return (PF_DROP); 5165 } 5166 5167 if (STATE_TRANSLATE(*state)) { 5168 if (direction == PF_IN) { 5169 pf_change_icmp(pd2.src, &th.th_sport, 5170 daddr, &(*state)->lan.addr, 5171 (*state)->lan.port, NULL, 5172 pd2.ip_sum, icmpsum, 5173 pd->ip_sum, 0, pd2.af); 5174 } else { 5175 pf_change_icmp(pd2.dst, &th.th_dport, 5176 saddr, &(*state)->gwy.addr, 5177 (*state)->gwy.port, NULL, 5178 pd2.ip_sum, icmpsum, 5179 pd->ip_sum, 0, pd2.af); 5180 } 5181 copyback = 1; 5182 } 5183 5184 if (copyback) { 5185 switch (pd2.af) { 5186#ifdef INET 5187 case AF_INET: 5188 m_copyback(m, off, ICMP_MINLEN, 5189 (caddr_t)pd->hdr.icmp); 5190 m_copyback(m, ipoff2, sizeof(h2), 5191 (caddr_t)&h2); 5192 break; 5193#endif /* INET */ 5194#ifdef INET6 5195 case AF_INET6: 5196 m_copyback(m, off, 5197 sizeof(struct icmp6_hdr), 5198 (caddr_t)pd->hdr.icmp6); 5199 m_copyback(m, ipoff2, sizeof(h2_6), 5200 (caddr_t)&h2_6); 5201 break; 5202#endif /* INET6 */ 5203 } 5204 m_copyback(m, off2, 8, (caddr_t)&th); 5205 } 5206 5207 return (PF_PASS); 5208 break; 5209 } 5210 case IPPROTO_UDP: { 5211 struct udphdr uh; 5212 struct pf_state key; 5213 5214 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5215 NULL, reason, pd2.af)) { 5216 DPFPRINTF(PF_DEBUG_MISC, 5217 ("pf: ICMP error message too short " 5218 "(udp)\n")); 5219 return (PF_DROP); 5220 } 5221 5222 key.af = pd2.af; 5223 key.proto = IPPROTO_UDP; 5224 if (direction == PF_IN) { 5225 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5226 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5227 key.ext.port = uh.uh_dport; 5228 key.gwy.port = uh.uh_sport; 5229 } else { 5230 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5231 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5232 key.lan.port = uh.uh_dport; 5233 key.ext.port = uh.uh_sport; 5234 } 5235 5236 STATE_LOOKUP(); 5237 5238 if (STATE_TRANSLATE(*state)) { 5239 if (direction == PF_IN) { 5240 pf_change_icmp(pd2.src, &uh.uh_sport, 5241 daddr, &(*state)->lan.addr, 5242 (*state)->lan.port, &uh.uh_sum, 5243 pd2.ip_sum, icmpsum, 5244 pd->ip_sum, 1, pd2.af); 5245 } else { 5246 pf_change_icmp(pd2.dst, &uh.uh_dport, 5247 saddr, &(*state)->gwy.addr, 5248 (*state)->gwy.port, &uh.uh_sum, 5249 pd2.ip_sum, icmpsum, 5250 pd->ip_sum, 1, pd2.af); 5251 } 5252 switch (pd2.af) { 5253#ifdef INET 5254 case AF_INET: 5255 m_copyback(m, off, ICMP_MINLEN, 5256 (caddr_t)pd->hdr.icmp); 5257 m_copyback(m, ipoff2, sizeof(h2), 5258 (caddr_t)&h2); 5259 break; 5260#endif /* INET */ 5261#ifdef INET6 5262 case AF_INET6: 5263 m_copyback(m, off, 5264 sizeof(struct icmp6_hdr), 5265 (caddr_t)pd->hdr.icmp6); 5266 m_copyback(m, ipoff2, sizeof(h2_6), 5267 (caddr_t)&h2_6); 5268 break; 5269#endif /* INET6 */ 5270 } 5271 m_copyback(m, off2, sizeof(uh), 5272 (caddr_t)&uh); 5273 } 5274 5275 return (PF_PASS); 5276 break; 5277 } 5278#ifdef INET 5279 case IPPROTO_ICMP: { 5280 struct icmp iih; 5281 struct pf_state key; 5282 5283 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5284 NULL, reason, pd2.af)) { 5285 DPFPRINTF(PF_DEBUG_MISC, 5286 ("pf: ICMP error message too short i" 5287 "(icmp)\n")); 5288 return (PF_DROP); 5289 } 5290 5291 key.af = pd2.af; 5292 key.proto = IPPROTO_ICMP; 5293 if (direction == PF_IN) { 5294 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5295 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5296 key.ext.port = 0; 5297 key.gwy.port = iih.icmp_id; 5298 } else { 5299 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5300 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5301 key.lan.port = iih.icmp_id; 5302 key.ext.port = 0; 5303 } 5304 5305 STATE_LOOKUP(); 5306 5307 if (STATE_TRANSLATE(*state)) { 5308 if (direction == PF_IN) { 5309 pf_change_icmp(pd2.src, &iih.icmp_id, 5310 daddr, &(*state)->lan.addr, 5311 (*state)->lan.port, NULL, 5312 pd2.ip_sum, icmpsum, 5313 pd->ip_sum, 0, AF_INET); 5314 } else { 5315 pf_change_icmp(pd2.dst, &iih.icmp_id, 5316 saddr, &(*state)->gwy.addr, 5317 (*state)->gwy.port, NULL, 5318 pd2.ip_sum, icmpsum, 5319 pd->ip_sum, 0, AF_INET); 5320 } 5321 m_copyback(m, off, ICMP_MINLEN, 5322 (caddr_t)pd->hdr.icmp); 5323 m_copyback(m, ipoff2, sizeof(h2), 5324 (caddr_t)&h2); 5325 m_copyback(m, off2, ICMP_MINLEN, 5326 (caddr_t)&iih); 5327 } 5328 5329 return (PF_PASS); 5330 break; 5331 } 5332#endif /* INET */ 5333#ifdef INET6 5334 case IPPROTO_ICMPV6: { 5335 struct icmp6_hdr iih; 5336 struct pf_state key; 5337 5338 if (!pf_pull_hdr(m, off2, &iih, 5339 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5340 DPFPRINTF(PF_DEBUG_MISC, 5341 ("pf: ICMP error message too short " 5342 "(icmp6)\n")); 5343 return (PF_DROP); 5344 } 5345 5346 key.af = pd2.af; 5347 key.proto = IPPROTO_ICMPV6; 5348 if (direction == PF_IN) { 5349 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5350 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5351 key.ext.port = 0; 5352 key.gwy.port = iih.icmp6_id; 5353 } else { 5354 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5355 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5356 key.lan.port = iih.icmp6_id; 5357 key.ext.port = 0; 5358 } 5359 5360 STATE_LOOKUP(); 5361 5362 if (STATE_TRANSLATE(*state)) { 5363 if (direction == PF_IN) { 5364 pf_change_icmp(pd2.src, &iih.icmp6_id, 5365 daddr, &(*state)->lan.addr, 5366 (*state)->lan.port, NULL, 5367 pd2.ip_sum, icmpsum, 5368 pd->ip_sum, 0, AF_INET6); 5369 } else { 5370 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5371 saddr, &(*state)->gwy.addr, 5372 (*state)->gwy.port, NULL, 5373 pd2.ip_sum, icmpsum, 5374 pd->ip_sum, 0, AF_INET6); 5375 } 5376 m_copyback(m, off, sizeof(struct icmp6_hdr), 5377 (caddr_t)pd->hdr.icmp6); 5378 m_copyback(m, ipoff2, sizeof(h2_6), 5379 (caddr_t)&h2_6); 5380 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5381 (caddr_t)&iih); 5382 } 5383 5384 return (PF_PASS); 5385 break; 5386 } 5387#endif /* INET6 */ 5388 default: { 5389 struct pf_state key; 5390 5391 key.af = pd2.af; 5392 key.proto = pd2.proto; 5393 if (direction == PF_IN) { 5394 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5395 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5396 key.ext.port = 0; 5397 key.gwy.port = 0; 5398 } else { 5399 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5400 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5401 key.lan.port = 0; 5402 key.ext.port = 0; 5403 } 5404 5405 STATE_LOOKUP(); 5406 5407 if (STATE_TRANSLATE(*state)) { 5408 if (direction == PF_IN) { 5409 pf_change_icmp(pd2.src, NULL, 5410 daddr, &(*state)->lan.addr, 5411 0, NULL, 5412 pd2.ip_sum, icmpsum, 5413 pd->ip_sum, 0, pd2.af); 5414 } else { 5415 pf_change_icmp(pd2.dst, NULL, 5416 saddr, &(*state)->gwy.addr, 5417 0, NULL, 5418 pd2.ip_sum, icmpsum, 5419 pd->ip_sum, 0, pd2.af); 5420 } 5421 switch (pd2.af) { 5422#ifdef INET 5423 case AF_INET: 5424 m_copyback(m, off, ICMP_MINLEN, 5425 (caddr_t)pd->hdr.icmp); 5426 m_copyback(m, ipoff2, sizeof(h2), 5427 (caddr_t)&h2); 5428 break; 5429#endif /* INET */ 5430#ifdef INET6 5431 case AF_INET6: 5432 m_copyback(m, off, 5433 sizeof(struct icmp6_hdr), 5434 (caddr_t)pd->hdr.icmp6); 5435 m_copyback(m, ipoff2, sizeof(h2_6), 5436 (caddr_t)&h2_6); 5437 break; 5438#endif /* INET6 */ 5439 } 5440 } 5441 5442 return (PF_PASS); 5443 break; 5444 } 5445 } 5446 } 5447} 5448 5449int 5450pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5451 struct pf_pdesc *pd) 5452{ 5453 struct pf_state_peer *src, *dst; 5454 struct pf_state key; 5455 5456 key.af = pd->af; 5457 key.proto = pd->proto; 5458 if (direction == PF_IN) { 5459 PF_ACPY(&key.ext.addr, pd->src, key.af); 5460 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5461 key.ext.port = 0; 5462 key.gwy.port = 0; 5463 } else { 5464 PF_ACPY(&key.lan.addr, pd->src, key.af); 5465 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5466 key.lan.port = 0; 5467 key.ext.port = 0; 5468 } 5469 5470 STATE_LOOKUP(); 5471 5472 if (direction == (*state)->direction) { 5473 src = &(*state)->src; 5474 dst = &(*state)->dst; 5475 } else { 5476 src = &(*state)->dst; 5477 dst = &(*state)->src; 5478 } 5479 5480 /* update states */ 5481 if (src->state < PFOTHERS_SINGLE) 5482 src->state = PFOTHERS_SINGLE; 5483 if (dst->state == PFOTHERS_SINGLE) 5484 dst->state = PFOTHERS_MULTIPLE; 5485 5486 /* update expire time */ 5487 (*state)->expire = time_second; 5488 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5489 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5490 else 5491 (*state)->timeout = PFTM_OTHER_SINGLE; 5492 5493 /* translate source/destination address, if necessary */ 5494 if (STATE_TRANSLATE(*state)) { 5495 if (direction == PF_OUT) 5496 switch (pd->af) { 5497#ifdef INET 5498 case AF_INET: 5499 pf_change_a(&pd->src->v4.s_addr, 5500 pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5501 0); 5502 break; 5503#endif /* INET */ 5504#ifdef INET6 5505 case AF_INET6: 5506 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 5507 break; 5508#endif /* INET6 */ 5509 } 5510 else 5511 switch (pd->af) { 5512#ifdef INET 5513 case AF_INET: 5514 pf_change_a(&pd->dst->v4.s_addr, 5515 pd->ip_sum, (*state)->lan.addr.v4.s_addr, 5516 0); 5517 break; 5518#endif /* INET */ 5519#ifdef INET6 5520 case AF_INET6: 5521 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 5522 break; 5523#endif /* INET6 */ 5524 } 5525 } 5526 5527 return (PF_PASS); 5528} 5529 5530/* 5531 * ipoff and off are measured from the start of the mbuf chain. 5532 * h must be at "ipoff" on the mbuf chain. 5533 */ 5534void * 5535pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5536 u_short *actionp, u_short *reasonp, sa_family_t af) 5537{ 5538 switch (af) { 5539#ifdef INET 5540 case AF_INET: { 5541 struct ip *h = mtod(m, struct ip *); 5542 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5543 5544 if (fragoff) { 5545 if (fragoff >= len) 5546 ACTION_SET(actionp, PF_PASS); 5547 else { 5548 ACTION_SET(actionp, PF_DROP); 5549 REASON_SET(reasonp, PFRES_FRAG); 5550 } 5551 return (NULL); 5552 } 5553 if (m->m_pkthdr.len < off + len || 5554 ntohs(h->ip_len) < off + len) { 5555 ACTION_SET(actionp, PF_DROP); 5556 REASON_SET(reasonp, PFRES_SHORT); 5557 return (NULL); 5558 } 5559 break; 5560 } 5561#endif /* INET */ 5562#ifdef INET6 5563 case AF_INET6: { 5564 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5565 5566 if (m->m_pkthdr.len < off + len || 5567 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5568 (unsigned)(off + len)) { 5569 ACTION_SET(actionp, PF_DROP); 5570 REASON_SET(reasonp, PFRES_SHORT); 5571 return (NULL); 5572 } 5573 break; 5574 } 5575#endif /* INET6 */ 5576 } 5577 m_copydata(m, off, len, p); 5578 return (p); 5579} 5580 5581int 5582pf_routable(struct pf_addr *addr, sa_family_t af) 5583{ 5584 struct sockaddr_in *dst; 5585#ifdef INET6 5586 struct sockaddr_in6 *dst6; 5587 struct route_in6 ro; 5588#else 5589 struct route ro; 5590#endif 5591 5592 bzero(&ro, sizeof(ro)); 5593 switch (af) { 5594 case AF_INET: 5595 dst = satosin(&ro.ro_dst); 5596 dst->sin_family = AF_INET; 5597 dst->sin_len = sizeof(*dst); 5598 dst->sin_addr = addr->v4; 5599 break; 5600#ifdef INET6 5601 case AF_INET6: 5602 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5603 dst6->sin6_family = AF_INET6; 5604 dst6->sin6_len = sizeof(*dst6); 5605 dst6->sin6_addr = addr->v6; 5606 break; 5607#endif /* INET6 */ 5608 default: 5609 return (0); 5610 } 5611 5612#ifdef __FreeBSD__ 5613#ifdef RTF_PRCLONING 5614 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5615#else /* !RTF_PRCLONING */ 5616 rtalloc_ign((struct route *)&ro, RTF_CLONING); 5617#endif 5618#else /* ! __FreeBSD__ */ 5619 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5620#endif 5621 5622 if (ro.ro_rt != NULL) { 5623 RTFREE(ro.ro_rt); 5624 return (1); 5625 } 5626 5627 return (0); 5628} 5629 5630int 5631pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5632{ 5633 struct sockaddr_in *dst; 5634#ifdef INET6 5635 struct sockaddr_in6 *dst6; 5636 struct route_in6 ro; 5637#else 5638 struct route ro; 5639#endif 5640 int ret = 0; 5641 5642 bzero(&ro, sizeof(ro)); 5643 switch (af) { 5644 case AF_INET: 5645 dst = satosin(&ro.ro_dst); 5646 dst->sin_family = AF_INET; 5647 dst->sin_len = sizeof(*dst); 5648 dst->sin_addr = addr->v4; 5649 break; 5650#ifdef INET6 5651 case AF_INET6: 5652 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5653 dst6->sin6_family = AF_INET6; 5654 dst6->sin6_len = sizeof(*dst6); 5655 dst6->sin6_addr = addr->v6; 5656 break; 5657#endif /* INET6 */ 5658 default: 5659 return (0); 5660 } 5661 5662#ifdef __FreeBSD__ 5663# ifdef RTF_PRCLONING 5664 rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 5665# else /* !RTF_PRCLONING */ 5666 rtalloc_ign((struct route *)&ro, RTF_CLONING); 5667# endif 5668#else /* ! __FreeBSD__ */ 5669 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5670#endif 5671 5672 if (ro.ro_rt != NULL) { 5673#ifdef __FreeBSD__ 5674 /* XXX_IMPORT: later */ 5675#else 5676 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 5677 ret = 1; 5678#endif 5679 RTFREE(ro.ro_rt); 5680 } 5681 5682 return (ret); 5683} 5684 5685#ifdef INET 5686 5687void 5688pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5689 struct pf_state *s) 5690{ 5691 struct mbuf *m0, *m1; 5692 struct m_tag *mtag; 5693 struct route iproute; 5694 struct route *ro = NULL; /* XXX: was uninitialized */ 5695 struct sockaddr_in *dst; 5696 struct ip *ip; 5697 struct ifnet *ifp = NULL; 5698 struct pf_addr naddr; 5699 struct pf_src_node *sn = NULL; 5700 int error = 0; 5701#ifdef __FreeBSD__ 5702 int sw_csum; 5703#endif 5704 5705 if (m == NULL || *m == NULL || r == NULL || 5706 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5707 panic("pf_route: invalid parameters"); 5708 5709 if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) { 5710 if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) == 5711 NULL) { 5712 m0 = *m; 5713 *m = NULL; 5714 goto bad; 5715 } 5716 *(char *)(mtag + 1) = 1; 5717 m_tag_prepend(*m, mtag); 5718 } else { 5719 if (*(char *)(mtag + 1) > 3) { 5720 m0 = *m; 5721 *m = NULL; 5722 goto bad; 5723 } 5724 (*(char *)(mtag + 1))++; 5725 } 5726 5727 if (r->rt == PF_DUPTO) { 5728#ifdef __FreeBSD__ 5729 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 5730#else 5731 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5732#endif 5733 return; 5734 } else { 5735 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5736 return; 5737 m0 = *m; 5738 } 5739 5740 if (m0->m_len < sizeof(struct ip)) { 5741 DPFPRINTF(PF_DEBUG_URGENT, 5742 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5743 goto bad; 5744 } 5745 5746 ip = mtod(m0, struct ip *); 5747 5748 ro = &iproute; 5749 bzero((caddr_t)ro, sizeof(*ro)); 5750 dst = satosin(&ro->ro_dst); 5751 dst->sin_family = AF_INET; 5752 dst->sin_len = sizeof(*dst); 5753 dst->sin_addr = ip->ip_dst; 5754 5755 if (r->rt == PF_FASTROUTE) { 5756 rtalloc(ro); 5757 if (ro->ro_rt == 0) { 5758 ipstat.ips_noroute++; 5759 goto bad; 5760 } 5761 5762 ifp = ro->ro_rt->rt_ifp; 5763 ro->ro_rt->rt_use++; 5764 5765 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5766 dst = satosin(ro->ro_rt->rt_gateway); 5767 } else { 5768 if (TAILQ_EMPTY(&r->rpool.list)) { 5769 DPFPRINTF(PF_DEBUG_URGENT, 5770 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5771 goto bad; 5772 } 5773 if (s == NULL) { 5774 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5775 &naddr, NULL, &sn); 5776 if (!PF_AZERO(&naddr, AF_INET)) 5777 dst->sin_addr.s_addr = naddr.v4.s_addr; 5778 ifp = r->rpool.cur->kif ? 5779 r->rpool.cur->kif->pfik_ifp : NULL; 5780 } else { 5781 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5782 dst->sin_addr.s_addr = 5783 s->rt_addr.v4.s_addr; 5784 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5785 } 5786 } 5787 if (ifp == NULL) 5788 goto bad; 5789 5790 if (oifp != ifp) { 5791#ifdef __FreeBSD__ 5792 PF_UNLOCK(); 5793 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5794 PF_LOCK(); 5795 goto bad; 5796 } else if (m0 == NULL) { 5797 PF_LOCK(); 5798 goto done; 5799 } 5800 PF_LOCK(); 5801#else 5802 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5803 goto bad; 5804 else if (m0 == NULL) 5805 goto done; 5806#endif 5807 if (m0->m_len < sizeof(struct ip)) { 5808 DPFPRINTF(PF_DEBUG_URGENT, 5809 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5810 goto bad; 5811 } 5812 ip = mtod(m0, struct ip *); 5813 } 5814 5815#ifdef __FreeBSD__ 5816 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 5817 m0->m_pkthdr.csum_flags |= CSUM_IP; 5818 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5819 if (sw_csum & CSUM_DELAY_DATA) { 5820 /* 5821 * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 5822 */ 5823 NTOHS(ip->ip_len); 5824 NTOHS(ip->ip_off); /* XXX: needed? */ 5825 in_delayed_cksum(m0); 5826 HTONS(ip->ip_len); 5827 HTONS(ip->ip_off); 5828 sw_csum &= ~CSUM_DELAY_DATA; 5829 } 5830 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5831 5832 if (ntohs(ip->ip_len) <= ifp->if_mtu || 5833 (ifp->if_hwassist & CSUM_FRAGMENT && 5834 ((ip->ip_off & htons(IP_DF)) == 0))) { 5835 /* 5836 * ip->ip_len = htons(ip->ip_len); 5837 * ip->ip_off = htons(ip->ip_off); 5838 */ 5839 ip->ip_sum = 0; 5840 if (sw_csum & CSUM_DELAY_IP) { 5841 /* From KAME */ 5842 if (ip->ip_v == IPVERSION && 5843 (ip->ip_hl << 2) == sizeof(*ip)) { 5844 ip->ip_sum = in_cksum_hdr(ip); 5845 } else { 5846 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5847 } 5848 } 5849 PF_UNLOCK(); 5850 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt); 5851 PF_LOCK(); 5852 goto done; 5853 } 5854 5855#else 5856 /* Copied from ip_output. */ 5857#ifdef IPSEC 5858 /* 5859 * If deferred crypto processing is needed, check that the 5860 * interface supports it. 5861 */ 5862 if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 5863 != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 5864 /* Notify IPsec to do its own crypto. */ 5865 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 5866 goto bad; 5867 } 5868#endif /* IPSEC */ 5869 5870 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 5871 if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT) { 5872 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 5873 ifp->if_bridge != NULL) { 5874 in_delayed_cksum(m0); 5875 m0->m_pkthdr.csum &= ~M_TCPV4_CSUM_OUT; /* Clear */ 5876 } 5877 } else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT) { 5878 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 5879 ifp->if_bridge != NULL) { 5880 in_delayed_cksum(m0); 5881 m0->m_pkthdr.csum &= ~M_UDPV4_CSUM_OUT; /* Clear */ 5882 } 5883 } 5884 5885 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 5886 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 5887 ifp->if_bridge == NULL) { 5888 m0->m_pkthdr.csum |= M_IPV4_CSUM_OUT; 5889 ipstat.ips_outhwcsum++; 5890 } else { 5891 ip->ip_sum = 0; 5892 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5893 } 5894 /* Update relevant hardware checksum stats for TCP/UDP */ 5895 if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT) 5896 tcpstat.tcps_outhwcsum++; 5897 else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT) 5898 udpstat.udps_outhwcsum++; 5899 error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 5900 goto done; 5901 } 5902#endif 5903 /* 5904 * Too large for interface; fragment if possible. 5905 * Must be able to put at least 8 bytes per fragment. 5906 */ 5907 if (ip->ip_off & htons(IP_DF)) { 5908 ipstat.ips_cantfrag++; 5909 if (r->rt != PF_DUPTO) { 5910#ifdef __FreeBSD__ 5911 /* icmp_error() expects host byte ordering */ 5912 NTOHS(ip->ip_len); 5913 NTOHS(ip->ip_off); 5914 PF_UNLOCK(); 5915 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5916 ifp->if_mtu); 5917 PF_LOCK(); 5918#else 5919 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5920 ifp); 5921#endif 5922 goto done; 5923 } else 5924 goto bad; 5925 } 5926 5927 m1 = m0; 5928#ifdef __FreeBSD__ 5929 /* 5930 * XXX: is cheaper + less error prone than own function 5931 */ 5932 NTOHS(ip->ip_len); 5933 NTOHS(ip->ip_off); 5934 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5935#else 5936 error = ip_fragment(m0, ifp, ifp->if_mtu); 5937#endif 5938 if (error) { 5939#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 5940 m0 = NULL; 5941#endif 5942 goto bad; 5943 } 5944 5945 for (m0 = m1; m0; m0 = m1) { 5946 m1 = m0->m_nextpkt; 5947 m0->m_nextpkt = 0; 5948#ifdef __FreeBSD__ 5949 if (error == 0) { 5950 PF_UNLOCK(); 5951 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5952 NULL); 5953 PF_LOCK(); 5954 } else 5955#else 5956 if (error == 0) 5957 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5958 NULL); 5959 else 5960#endif 5961 m_freem(m0); 5962 } 5963 5964 if (error == 0) 5965 ipstat.ips_fragmented++; 5966 5967done: 5968 if (r->rt != PF_DUPTO) 5969 *m = NULL; 5970 if (ro == &iproute && ro->ro_rt) 5971 RTFREE(ro->ro_rt); 5972 return; 5973 5974bad: 5975 m_freem(m0); 5976 goto done; 5977} 5978#endif /* INET */ 5979 5980#ifdef INET6 5981void 5982pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5983 struct pf_state *s) 5984{ 5985 struct mbuf *m0; 5986 struct m_tag *mtag; 5987 struct route_in6 ip6route; 5988 struct route_in6 *ro; 5989 struct sockaddr_in6 *dst; 5990 struct ip6_hdr *ip6; 5991 struct ifnet *ifp = NULL; 5992 struct pf_addr naddr; 5993 struct pf_src_node *sn = NULL; 5994 int error = 0; 5995 5996 if (m == NULL || *m == NULL || r == NULL || 5997 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5998 panic("pf_route6: invalid parameters"); 5999 6000 if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) { 6001 if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) == 6002 NULL) { 6003 m0 = *m; 6004 *m = NULL; 6005 goto bad; 6006 } 6007 *(char *)(mtag + 1) = 1; 6008 m_tag_prepend(*m, mtag); 6009 } else { 6010 if (*(char *)(mtag + 1) > 3) { 6011 m0 = *m; 6012 *m = NULL; 6013 goto bad; 6014 } 6015 (*(char *)(mtag + 1))++; 6016 } 6017 6018 if (r->rt == PF_DUPTO) { 6019#ifdef __FreeBSD__ 6020 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6021#else 6022 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6023#endif 6024 return; 6025 } else { 6026 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6027 return; 6028 m0 = *m; 6029 } 6030 6031 if (m0->m_len < sizeof(struct ip6_hdr)) { 6032 DPFPRINTF(PF_DEBUG_URGENT, 6033 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6034 goto bad; 6035 } 6036 ip6 = mtod(m0, struct ip6_hdr *); 6037 6038 ro = &ip6route; 6039 bzero((caddr_t)ro, sizeof(*ro)); 6040 dst = (struct sockaddr_in6 *)&ro->ro_dst; 6041 dst->sin6_family = AF_INET6; 6042 dst->sin6_len = sizeof(*dst); 6043 dst->sin6_addr = ip6->ip6_dst; 6044 6045 /* Cheat. */ 6046 if (r->rt == PF_FASTROUTE) { 6047#ifdef __FreeBSD__ 6048 m0->m_flags |= M_SKIP_FIREWALL; 6049 PF_UNLOCK(); 6050 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6051 PF_LOCK(); 6052#else 6053 mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 6054 if (mtag == NULL) 6055 goto bad; 6056 m_tag_prepend(m0, mtag); 6057 ip6_output(m0, NULL, NULL, 0, NULL, NULL); 6058#endif 6059 return; 6060 } 6061 6062 if (TAILQ_EMPTY(&r->rpool.list)) { 6063 DPFPRINTF(PF_DEBUG_URGENT, 6064 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6065 goto bad; 6066 } 6067 if (s == NULL) { 6068 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6069 &naddr, NULL, &sn); 6070 if (!PF_AZERO(&naddr, AF_INET6)) 6071 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6072 &naddr, AF_INET6); 6073 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6074 } else { 6075 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6076 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6077 &s->rt_addr, AF_INET6); 6078 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6079 } 6080 if (ifp == NULL) 6081 goto bad; 6082 6083 if (oifp != ifp) { 6084#ifdef __FreeBSD__ 6085 PF_UNLOCK(); 6086 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6087 PF_LOCK(); 6088 goto bad; 6089 } else if (m0 == NULL) { 6090 PF_LOCK(); 6091 goto done; 6092 } 6093 PF_LOCK(); 6094#else 6095 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6096 goto bad; 6097 else if (m0 == NULL) 6098 goto done; 6099#endif 6100 if (m0->m_len < sizeof(struct ip6_hdr)) { 6101 DPFPRINTF(PF_DEBUG_URGENT, 6102 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6103 goto bad; 6104 } 6105 ip6 = mtod(m0, struct ip6_hdr *); 6106 } 6107 6108 /* 6109 * If the packet is too large for the outgoing interface, 6110 * send back an icmp6 error. 6111 */ 6112 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 6113 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6114 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6115#ifdef __FreeBSD__ 6116 PF_UNLOCK(); 6117#endif 6118 error = nd6_output(ifp, ifp, m0, dst, NULL); 6119#ifdef __FreeBSD__ 6120 PF_LOCK(); 6121#endif 6122 } else { 6123 in6_ifstat_inc(ifp, ifs6_in_toobig); 6124#ifdef __FreeBSD__ 6125 if (r->rt != PF_DUPTO) { 6126 PF_UNLOCK(); 6127 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6128 PF_LOCK(); 6129 } else 6130#else 6131 if (r->rt != PF_DUPTO) 6132 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6133 else 6134#endif 6135 goto bad; 6136 } 6137 6138done: 6139 if (r->rt != PF_DUPTO) 6140 *m = NULL; 6141 return; 6142 6143bad: 6144 m_freem(m0); 6145 goto done; 6146} 6147#endif /* INET6 */ 6148 6149 6150#ifdef __FreeBSD__ 6151/* 6152 * FreeBSD supports cksum offloads for the following drivers. 6153 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6154 * ti(4), txp(4), xl(4) 6155 * 6156 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6157 * network driver performed cksum including pseudo header, need to verify 6158 * csum_data 6159 * CSUM_DATA_VALID : 6160 * network driver performed cksum, needs to additional pseudo header 6161 * cksum computation with partial csum_data(i.e. lack of H/W support for 6162 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6163 * 6164 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6165 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6166 * TCP/UDP layer. 6167 * Also, set csum_data to 0xffff to force cksum validation. 6168 */ 6169int 6170pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6171{ 6172 u_int16_t sum = 0; 6173 int hw_assist = 0; 6174 struct ip *ip; 6175 6176 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6177 return (1); 6178 if (m->m_pkthdr.len < off + len) 6179 return (1); 6180 6181 switch (p) { 6182 case IPPROTO_TCP: 6183 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6184 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6185 sum = m->m_pkthdr.csum_data; 6186 } else { 6187 ip = mtod(m, struct ip *); 6188 sum = in_pseudo(ip->ip_src.s_addr, 6189 ip->ip_dst.s_addr, htonl((u_short)len + 6190 m->m_pkthdr.csum_data + IPPROTO_TCP)); 6191 } 6192 sum ^= 0xffff; 6193 ++hw_assist; 6194 } 6195 break; 6196 case IPPROTO_UDP: 6197 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6198 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6199 sum = m->m_pkthdr.csum_data; 6200 } else { 6201 ip = mtod(m, struct ip *); 6202 sum = in_pseudo(ip->ip_src.s_addr, 6203 ip->ip_dst.s_addr, htonl((u_short)len + 6204 m->m_pkthdr.csum_data + IPPROTO_UDP)); 6205 } 6206 sum ^= 0xffff; 6207 ++hw_assist; 6208 } 6209 break; 6210 case IPPROTO_ICMP: 6211#ifdef INET6 6212 case IPPROTO_ICMPV6: 6213#endif /* INET6 */ 6214 break; 6215 default: 6216 return (1); 6217 } 6218 6219 if (!hw_assist) { 6220 switch (af) { 6221 case AF_INET: 6222 if (p == IPPROTO_ICMP) { 6223 if (m->m_len < off) 6224 return (1); 6225 m->m_data += off; 6226 m->m_len -= off; 6227 sum = in_cksum(m, len); 6228 m->m_data -= off; 6229 m->m_len += off; 6230 } else { 6231 if (m->m_len < sizeof(struct ip)) 6232 return (1); 6233 sum = in4_cksum(m, p, off, len); 6234 } 6235 break; 6236#ifdef INET6 6237 case AF_INET6: 6238 if (m->m_len < sizeof(struct ip6_hdr)) 6239 return (1); 6240 sum = in6_cksum(m, p, off, len); 6241 break; 6242#endif /* INET6 */ 6243 default: 6244 return (1); 6245 } 6246 } 6247 if (sum) { 6248 switch (p) { 6249 case IPPROTO_TCP: 6250 tcpstat.tcps_rcvbadsum++; 6251 break; 6252 case IPPROTO_UDP: 6253 udpstat.udps_badsum++; 6254 break; 6255 case IPPROTO_ICMP: 6256 icmpstat.icps_checksum++; 6257 break; 6258#ifdef INET6 6259 case IPPROTO_ICMPV6: 6260 icmp6stat.icp6s_checksum++; 6261 break; 6262#endif /* INET6 */ 6263 } 6264 return (1); 6265 } else { 6266 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6267 m->m_pkthdr.csum_flags |= 6268 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6269 m->m_pkthdr.csum_data = 0xffff; 6270 } 6271 } 6272 return (0); 6273} 6274#else 6275/* 6276 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6277 * off is the offset where the protocol header starts 6278 * len is the total length of protocol header plus payload 6279 * returns 0 when the checksum is valid, otherwise returns 1. 6280 */ 6281int 6282pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6283 sa_family_t af) 6284{ 6285 u_int16_t flag_ok, flag_bad; 6286 u_int16_t sum; 6287 6288 switch (p) { 6289 case IPPROTO_TCP: 6290 flag_ok = M_TCP_CSUM_IN_OK; 6291 flag_bad = M_TCP_CSUM_IN_BAD; 6292 break; 6293 case IPPROTO_UDP: 6294 flag_ok = M_UDP_CSUM_IN_OK; 6295 flag_bad = M_UDP_CSUM_IN_BAD; 6296 break; 6297 case IPPROTO_ICMP: 6298#ifdef INET6 6299 case IPPROTO_ICMPV6: 6300#endif /* INET6 */ 6301 flag_ok = flag_bad = 0; 6302 break; 6303 default: 6304 return (1); 6305 } 6306 if (m->m_pkthdr.csum & flag_ok) 6307 return (0); 6308 if (m->m_pkthdr.csum & flag_bad) 6309 return (1); 6310 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6311 return (1); 6312 if (m->m_pkthdr.len < off + len) 6313 return (1); 6314 switch (af) { 6315#ifdef INET 6316 case AF_INET: 6317 if (p == IPPROTO_ICMP) { 6318 if (m->m_len < off) 6319 return (1); 6320 m->m_data += off; 6321 m->m_len -= off; 6322 sum = in_cksum(m, len); 6323 m->m_data -= off; 6324 m->m_len += off; 6325 } else { 6326 if (m->m_len < sizeof(struct ip)) 6327 return (1); 6328 sum = in4_cksum(m, p, off, len); 6329 } 6330 break; 6331#endif /* INET */ 6332#ifdef INET6 6333 case AF_INET6: 6334 if (m->m_len < sizeof(struct ip6_hdr)) 6335 return (1); 6336 sum = in6_cksum(m, p, off, len); 6337 break; 6338#endif /* INET6 */ 6339 default: 6340 return (1); 6341 } 6342 if (sum) { 6343 m->m_pkthdr.csum |= flag_bad; 6344 switch (p) { 6345 case IPPROTO_TCP: 6346 tcpstat.tcps_rcvbadsum++; 6347 break; 6348 case IPPROTO_UDP: 6349 udpstat.udps_badsum++; 6350 break; 6351 case IPPROTO_ICMP: 6352 icmpstat.icps_checksum++; 6353 break; 6354#ifdef INET6 6355 case IPPROTO_ICMPV6: 6356 icmp6stat.icp6s_checksum++; 6357 break; 6358#endif /* INET6 */ 6359 } 6360 return (1); 6361 } 6362 m->m_pkthdr.csum |= flag_ok; 6363 return (0); 6364} 6365#endif 6366 6367static int 6368pf_add_mbuf_tag(struct mbuf *m, u_int tag) 6369{ 6370 struct m_tag *mtag; 6371 6372 if (m_tag_find(m, tag, NULL) != NULL) 6373 return (0); 6374 mtag = m_tag_get(tag, 0, M_NOWAIT); 6375 if (mtag == NULL) 6376 return (1); 6377 m_tag_prepend(m, mtag); 6378 return (0); 6379} 6380 6381#ifdef INET 6382int 6383#ifdef __FreeBSD__ 6384pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6385 struct ether_header *eh, struct inpcb *inp) 6386#else 6387pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6388 struct ether_header *eh) 6389#endif 6390{ 6391 struct pfi_kif *kif; 6392 u_short action, reason = 0, log = 0; 6393 struct mbuf *m = *m0; 6394 struct ip *h = NULL; /* make the compiler happy */ 6395 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6396 struct pf_state *s = NULL; 6397 struct pf_ruleset *ruleset = NULL; 6398 struct pf_pdesc pd; 6399 int off, dirndx, pqid = 0; 6400 6401#ifdef __FreeBSD__ 6402 PF_LOCK(); 6403#endif 6404 if (!pf_status.running || 6405#ifdef __FreeBSD__ 6406 (m->m_flags & M_SKIP_FIREWALL)) { 6407 PF_UNLOCK(); 6408#else 6409 (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) { 6410#endif 6411 return (PF_PASS); 6412 } 6413 6414#ifdef __FreeBSD__ 6415 /* XXX_IMPORT: later */ 6416#else 6417 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6418 ifp = ifp->if_carpdev; 6419#endif 6420 6421 kif = pfi_index2kif[ifp->if_index]; 6422 if (kif == NULL) { 6423#ifdef __FreeBSD__ 6424 PF_UNLOCK(); 6425#endif 6426 DPFPRINTF(PF_DEBUG_URGENT, 6427 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6428 return (PF_DROP); 6429 } 6430 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6431#ifdef __FreeBSD__ 6432 PF_UNLOCK(); 6433#endif 6434 return (PF_PASS); 6435 } 6436 6437#ifdef __FreeBSD__ 6438 M_ASSERTPKTHDR(m); 6439#else 6440#ifdef DIAGNOSTIC 6441 if ((m->m_flags & M_PKTHDR) == 0) 6442 panic("non-M_PKTHDR is passed to pf_test"); 6443#endif /* DIAGNOSTIC */ 6444#endif /* __FreeBSD__ */ 6445 6446 memset(&pd, 0, sizeof(pd)); 6447 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6448 action = PF_DROP; 6449 REASON_SET(&reason, PFRES_SHORT); 6450 log = 1; 6451 goto done; 6452 } 6453 6454 /* We do IP header normalization and packet reassembly here */ 6455 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6456 action = PF_DROP; 6457 goto done; 6458 } 6459 m = *m0; 6460 h = mtod(m, struct ip *); 6461 6462 off = h->ip_hl << 2; 6463 if (off < (int)sizeof(*h)) { 6464 action = PF_DROP; 6465 REASON_SET(&reason, PFRES_SHORT); 6466 log = 1; 6467 goto done; 6468 } 6469 6470 pd.src = (struct pf_addr *)&h->ip_src; 6471 pd.dst = (struct pf_addr *)&h->ip_dst; 6472 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 6473 pd.ip_sum = &h->ip_sum; 6474 pd.proto = h->ip_p; 6475 pd.af = AF_INET; 6476 pd.tos = h->ip_tos; 6477 pd.tot_len = ntohs(h->ip_len); 6478 pd.eh = eh; 6479 6480 /* handle fragments that didn't get reassembled by normalization */ 6481 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6482 action = pf_test_fragment(&r, dir, kif, m, h, 6483 &pd, &a, &ruleset); 6484 goto done; 6485 } 6486 6487 switch (h->ip_p) { 6488 6489 case IPPROTO_TCP: { 6490 struct tcphdr th; 6491 6492 pd.hdr.tcp = &th; 6493 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6494 &action, &reason, AF_INET)) { 6495 log = action != PF_PASS; 6496 goto done; 6497 } 6498 if (dir == PF_IN && pf_check_proto_cksum(m, off, 6499 ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 6500 action = PF_DROP; 6501 goto done; 6502 } 6503 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6504 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6505 pqid = 1; 6506 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6507 if (action == PF_DROP) 6508 goto done; 6509 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6510 &reason); 6511 if (action == PF_PASS) { 6512#if NPFSYNC 6513 pfsync_update_state(s); 6514#endif /* NPFSYNC */ 6515 r = s->rule.ptr; 6516 a = s->anchor.ptr; 6517 log = s->log; 6518 } else if (s == NULL) 6519#ifdef __FreeBSD__ 6520 action = pf_test_tcp(&r, &s, dir, kif, 6521 m, off, h, &pd, &a, &ruleset, NULL, inp); 6522#else 6523 action = pf_test_tcp(&r, &s, dir, kif, 6524 m, off, h, &pd, &a, &ruleset, &ipintrq); 6525#endif 6526 break; 6527 } 6528 6529 case IPPROTO_UDP: { 6530 struct udphdr uh; 6531 6532 pd.hdr.udp = &uh; 6533 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6534 &action, &reason, AF_INET)) { 6535 log = action != PF_PASS; 6536 goto done; 6537 } 6538 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6539 off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 6540 action = PF_DROP; 6541 goto done; 6542 } 6543 if (uh.uh_dport == 0 || 6544 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6545 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6546 action = PF_DROP; 6547 goto done; 6548 } 6549 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6550 if (action == PF_PASS) { 6551#if NPFSYNC 6552 pfsync_update_state(s); 6553#endif /* NPFSYNC */ 6554 r = s->rule.ptr; 6555 a = s->anchor.ptr; 6556 log = s->log; 6557 } else if (s == NULL) 6558#ifdef __FreeBSD__ 6559 action = pf_test_udp(&r, &s, dir, kif, 6560 m, off, h, &pd, &a, &ruleset, NULL, inp); 6561#else 6562 action = pf_test_udp(&r, &s, dir, kif, 6563 m, off, h, &pd, &a, &ruleset, &ipintrq); 6564#endif 6565 break; 6566 } 6567 6568 case IPPROTO_ICMP: { 6569 struct icmp ih; 6570 6571 pd.hdr.icmp = &ih; 6572 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6573 &action, &reason, AF_INET)) { 6574 log = action != PF_PASS; 6575 goto done; 6576 } 6577 if (dir == PF_IN && pf_check_proto_cksum(m, off, 6578 ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 6579 action = PF_DROP; 6580 goto done; 6581 } 6582 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6583 &reason); 6584 if (action == PF_PASS) { 6585#if NPFSYNC 6586 pfsync_update_state(s); 6587#endif /* NPFSYNC */ 6588 r = s->rule.ptr; 6589 a = s->anchor.ptr; 6590 log = s->log; 6591 } else if (s == NULL) 6592#ifdef __FreeBSD__ 6593 action = pf_test_icmp(&r, &s, dir, kif, 6594 m, off, h, &pd, &a, &ruleset, NULL); 6595#else 6596 action = pf_test_icmp(&r, &s, dir, kif, 6597 m, off, h, &pd, &a, &ruleset, &ipintrq); 6598#endif 6599 break; 6600 } 6601 6602 default: 6603 action = pf_test_state_other(&s, dir, kif, &pd); 6604 if (action == PF_PASS) { 6605#if NPFSYNC 6606 pfsync_update_state(s); 6607#endif /* NPFSYNC */ 6608 r = s->rule.ptr; 6609 a = s->anchor.ptr; 6610 log = s->log; 6611 } else if (s == NULL) 6612#ifdef __FreeBSD__ 6613 action = pf_test_other(&r, &s, dir, kif, m, off, h, 6614 &pd, &a, &ruleset, NULL); 6615#else 6616 action = pf_test_other(&r, &s, dir, kif, m, off, h, 6617 &pd, &a, &ruleset, &ipintrq); 6618#endif 6619 break; 6620 } 6621 6622done: 6623 if (action == PF_PASS && h->ip_hl > 5 && 6624 !((s && s->allow_opts) || r->allow_opts)) { 6625 action = PF_DROP; 6626 REASON_SET(&reason, PFRES_IPOPTIONS); 6627 log = 1; 6628 DPFPRINTF(PF_DEBUG_MISC, 6629 ("pf: dropping packet with ip options\n")); 6630 } 6631 6632 if (s && s->tag) 6633 pf_tag_packet(m, pf_get_tag(m), s->tag); 6634 6635#ifdef ALTQ 6636 if (action == PF_PASS && r->qid) { 6637 struct m_tag *mtag; 6638 struct altq_tag *atag; 6639 6640 mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 6641 if (mtag != NULL) { 6642 atag = (struct altq_tag *)(mtag + 1); 6643 if (pqid || pd.tos == IPTOS_LOWDELAY) 6644 atag->qid = r->pqid; 6645 else 6646 atag->qid = r->qid; 6647 /* add hints for ecn */ 6648 atag->af = AF_INET; 6649 atag->hdr = h; 6650 m_tag_prepend(m, mtag); 6651 } 6652 } 6653#endif /* ALTQ */ 6654 6655 /* 6656 * connections redirected to loopback should not match sockets 6657 * bound specifically to loopback due to security implications, 6658 * see tcp_input() and in_pcblookup_listen(). 6659 */ 6660 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6661 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6662 (s->nat_rule.ptr->action == PF_RDR || 6663 s->nat_rule.ptr->action == PF_BINAT) && 6664 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET && 6665 pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) { 6666 action = PF_DROP; 6667 REASON_SET(&reason, PFRES_MEMORY); 6668 } 6669 6670 if (log) 6671 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset); 6672 6673 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6674 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6675 6676 if (action == PF_PASS || r->action == PF_DROP) { 6677 r->packets++; 6678 r->bytes += pd.tot_len; 6679 if (a != NULL) { 6680 a->packets++; 6681 a->bytes += pd.tot_len; 6682 } 6683 if (s != NULL) { 6684 dirndx = (dir == s->direction) ? 0 : 1; 6685 s->packets[dirndx]++; 6686 s->bytes[dirndx] += pd.tot_len; 6687 if (s->nat_rule.ptr != NULL) { 6688 s->nat_rule.ptr->packets++; 6689 s->nat_rule.ptr->bytes += pd.tot_len; 6690 } 6691 if (s->src_node != NULL) { 6692 s->src_node->packets++; 6693 s->src_node->bytes += pd.tot_len; 6694 } 6695 if (s->nat_src_node != NULL) { 6696 s->nat_src_node->packets++; 6697 s->nat_src_node->bytes += pd.tot_len; 6698 } 6699 } 6700 tr = r; 6701 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6702 if (nr != NULL) { 6703 struct pf_addr *x; 6704 /* 6705 * XXX: we need to make sure that the addresses 6706 * passed to pfr_update_stats() are the same than 6707 * the addresses used during matching (pfr_match) 6708 */ 6709 if (r == &pf_default_rule) { 6710 tr = nr; 6711 x = (s == NULL || s->direction == dir) ? 6712 &pd.baddr : &pd.naddr; 6713 } else 6714 x = (s == NULL || s->direction == dir) ? 6715 &pd.naddr : &pd.baddr; 6716 if (x == &pd.baddr || s == NULL) { 6717 /* we need to change the address */ 6718 if (dir == PF_OUT) 6719 pd.src = x; 6720 else 6721 pd.dst = x; 6722 } 6723 } 6724 if (tr->src.addr.type == PF_ADDR_TABLE) 6725 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 6726 s->direction == dir) ? pd.src : pd.dst, pd.af, 6727 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6728 tr->src.neg); 6729 if (tr->dst.addr.type == PF_ADDR_TABLE) 6730 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 6731 s->direction == dir) ? pd.dst : pd.src, pd.af, 6732 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6733 tr->dst.neg); 6734 } 6735 6736 6737 if (action == PF_SYNPROXY_DROP) { 6738 m_freem(*m0); 6739 *m0 = NULL; 6740 action = PF_PASS; 6741 } else if (r->rt) 6742 /* pf_route can free the mbuf causing *m0 to become NULL */ 6743 pf_route(m0, r, dir, ifp, s); 6744 6745#ifdef __FreeBSD__ 6746 PF_UNLOCK(); 6747#endif 6748 6749 return (action); 6750} 6751#endif /* INET */ 6752 6753#ifdef INET6 6754int 6755#ifdef __FreeBSD__ 6756pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6757 struct ether_header *eh, struct inpcb *inp) 6758#else 6759pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6760 struct ether_header *eh) 6761#endif 6762{ 6763 struct pfi_kif *kif; 6764 u_short action, reason = 0, log = 0; 6765 struct mbuf *m = *m0; 6766 struct ip6_hdr *h = NULL; /* make the compiler happy */ 6767 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6768 struct pf_state *s = NULL; 6769 struct pf_ruleset *ruleset = NULL; 6770 struct pf_pdesc pd; 6771 int off, terminal = 0, dirndx; 6772 6773#ifdef __FreeBSD__ 6774 PF_LOCK(); 6775#endif 6776 6777 if (!pf_status.running || 6778#ifdef __FreeBSD__ 6779 (m->m_flags & M_SKIP_FIREWALL)) { 6780 PF_UNLOCK(); 6781#else 6782 (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) { 6783#endif 6784 return (PF_PASS); 6785 } 6786 6787#ifdef __FreeBSD__ 6788 /* XXX_IMPORT: later */ 6789#else 6790 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6791 ifp = ifp->if_carpdev; 6792#endif 6793 6794 kif = pfi_index2kif[ifp->if_index]; 6795 if (kif == NULL) { 6796#ifdef __FreeBSD__ 6797 PF_UNLOCK(); 6798#endif 6799 DPFPRINTF(PF_DEBUG_URGENT, 6800 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6801 return (PF_DROP); 6802 } 6803 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6804#ifdef __FreeBSD__ 6805 PF_UNLOCK(); 6806#endif 6807 return (PF_PASS); 6808 } 6809 6810#ifdef __FreeBSD__ 6811 M_ASSERTPKTHDR(m); 6812#else 6813#ifdef DIAGNOSTIC 6814 if ((m->m_flags & M_PKTHDR) == 0) 6815 panic("non-M_PKTHDR is passed to pf_test6"); 6816#endif /* DIAGNOSTIC */ 6817#endif 6818 6819 memset(&pd, 0, sizeof(pd)); 6820 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6821 action = PF_DROP; 6822 REASON_SET(&reason, PFRES_SHORT); 6823 log = 1; 6824 goto done; 6825 } 6826 6827 /* We do IP header normalization and packet reassembly here */ 6828 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6829 action = PF_DROP; 6830 goto done; 6831 } 6832 m = *m0; 6833 h = mtod(m, struct ip6_hdr *); 6834 6835 pd.src = (struct pf_addr *)&h->ip6_src; 6836 pd.dst = (struct pf_addr *)&h->ip6_dst; 6837 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 6838 pd.ip_sum = NULL; 6839 pd.af = AF_INET6; 6840 pd.tos = 0; 6841 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6842 pd.eh = eh; 6843 6844 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6845 pd.proto = h->ip6_nxt; 6846 do { 6847 switch (pd.proto) { 6848 case IPPROTO_FRAGMENT: 6849 action = pf_test_fragment(&r, dir, kif, m, h, 6850 &pd, &a, &ruleset); 6851 if (action == PF_DROP) 6852 REASON_SET(&reason, PFRES_FRAG); 6853 goto done; 6854 case IPPROTO_AH: 6855 case IPPROTO_HOPOPTS: 6856 case IPPROTO_ROUTING: 6857 case IPPROTO_DSTOPTS: { 6858 /* get next header and header length */ 6859 struct ip6_ext opt6; 6860 6861 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6862 NULL, &reason, pd.af)) { 6863 DPFPRINTF(PF_DEBUG_MISC, 6864 ("pf: IPv6 short opt\n")); 6865 action = PF_DROP; 6866 log = 1; 6867 goto done; 6868 } 6869 if (pd.proto == IPPROTO_AH) 6870 off += (opt6.ip6e_len + 2) * 4; 6871 else 6872 off += (opt6.ip6e_len + 1) * 8; 6873 pd.proto = opt6.ip6e_nxt; 6874 /* goto the next header */ 6875 break; 6876 } 6877 default: 6878 terminal++; 6879 break; 6880 } 6881 } while (!terminal); 6882 6883 switch (pd.proto) { 6884 6885 case IPPROTO_TCP: { 6886 struct tcphdr th; 6887 6888 pd.hdr.tcp = &th; 6889 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6890 &action, &reason, AF_INET6)) { 6891 log = action != PF_PASS; 6892 goto done; 6893 } 6894 if (dir == PF_IN && pf_check_proto_cksum(m, off, 6895 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 6896 IPPROTO_TCP, AF_INET6)) { 6897 action = PF_DROP; 6898 REASON_SET(&reason, PFRES_PROTCKSUM); 6899 goto done; 6900 } 6901 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6902 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6903 if (action == PF_DROP) 6904 goto done; 6905 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6906 &reason); 6907 if (action == PF_PASS) { 6908#if NPFSYNC 6909 pfsync_update_state(s); 6910#endif /* NPFSYNC */ 6911 r = s->rule.ptr; 6912 a = s->anchor.ptr; 6913 log = s->log; 6914 } else if (s == NULL) 6915#ifdef __FreeBSD__ 6916 action = pf_test_tcp(&r, &s, dir, kif, 6917 m, off, h, &pd, &a, &ruleset, NULL, inp); 6918#else 6919 action = pf_test_tcp(&r, &s, dir, kif, 6920 m, off, h, &pd, &a, &ruleset, &ip6intrq); 6921#endif 6922 break; 6923 } 6924 6925 case IPPROTO_UDP: { 6926 struct udphdr uh; 6927 6928 pd.hdr.udp = &uh; 6929 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6930 &action, &reason, AF_INET6)) { 6931 log = action != PF_PASS; 6932 goto done; 6933 } 6934 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6935 off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 6936 IPPROTO_UDP, AF_INET6)) { 6937 action = PF_DROP; 6938 REASON_SET(&reason, PFRES_PROTCKSUM); 6939 goto done; 6940 } 6941 if (uh.uh_dport == 0 || 6942 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6943 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6944 action = PF_DROP; 6945 goto done; 6946 } 6947 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6948 if (action == PF_PASS) { 6949#if NPFSYNC 6950 pfsync_update_state(s); 6951#endif /* NPFSYNC */ 6952 r = s->rule.ptr; 6953 a = s->anchor.ptr; 6954 log = s->log; 6955 } else if (s == NULL) 6956#ifdef __FreeBSD__ 6957 action = pf_test_udp(&r, &s, dir, kif, 6958 m, off, h, &pd, &a, &ruleset, NULL, inp); 6959#else 6960 action = pf_test_udp(&r, &s, dir, kif, 6961 m, off, h, &pd, &a, &ruleset, &ip6intrq); 6962#endif 6963 break; 6964 } 6965 6966 case IPPROTO_ICMPV6: { 6967 struct icmp6_hdr ih; 6968 6969 pd.hdr.icmp6 = &ih; 6970 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6971 &action, &reason, AF_INET6)) { 6972 log = action != PF_PASS; 6973 goto done; 6974 } 6975 if (dir == PF_IN && pf_check_proto_cksum(m, off, 6976 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 6977 IPPROTO_ICMPV6, AF_INET6)) { 6978 action = PF_DROP; 6979 REASON_SET(&reason, PFRES_PROTCKSUM); 6980 goto done; 6981 } 6982 action = pf_test_state_icmp(&s, dir, kif, 6983 m, off, h, &pd, &reason); 6984 if (action == PF_PASS) { 6985#if NPFSYNC 6986 pfsync_update_state(s); 6987#endif /* NPFSYNC */ 6988 r = s->rule.ptr; 6989 a = s->anchor.ptr; 6990 log = s->log; 6991 } else if (s == NULL) 6992#ifdef __FreeBSD__ 6993 action = pf_test_icmp(&r, &s, dir, kif, 6994 m, off, h, &pd, &a, &ruleset, NULL); 6995#else 6996 action = pf_test_icmp(&r, &s, dir, kif, 6997 m, off, h, &pd, &a, &ruleset, &ip6intrq); 6998#endif 6999 break; 7000 } 7001 7002 default: 7003 action = pf_test_state_other(&s, dir, kif, &pd); 7004 if (action == PF_PASS) { 7005#if NPFSYNC 7006 pfsync_update_state(s); 7007#endif /* NPFSYNC */ 7008 r = s->rule.ptr; 7009 a = s->anchor.ptr; 7010 log = s->log; 7011 } else if (s == NULL) 7012#ifdef __FreeBSD__ 7013 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7014 &pd, &a, &ruleset, NULL); 7015#else 7016 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7017 &pd, &a, &ruleset, &ip6intrq); 7018#endif 7019 break; 7020 } 7021 7022done: 7023 /* XXX handle IPv6 options, if not allowed. not implemented. */ 7024 7025 if (s && s->tag) 7026 pf_tag_packet(m, pf_get_tag(m), s->tag); 7027 7028#ifdef ALTQ 7029 if (action == PF_PASS && r->qid) { 7030 struct m_tag *mtag; 7031 struct altq_tag *atag; 7032 7033 mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 7034 if (mtag != NULL) { 7035 atag = (struct altq_tag *)(mtag + 1); 7036 if (pd.tos == IPTOS_LOWDELAY) 7037 atag->qid = r->pqid; 7038 else 7039 atag->qid = r->qid; 7040 /* add hints for ecn */ 7041 atag->af = AF_INET6; 7042 atag->hdr = h; 7043 m_tag_prepend(m, mtag); 7044 } 7045 } 7046#endif /* ALTQ */ 7047 7048 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7049 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7050 (s->nat_rule.ptr->action == PF_RDR || 7051 s->nat_rule.ptr->action == PF_BINAT) && 7052 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6) && 7053 pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) { 7054 action = PF_DROP; 7055 REASON_SET(&reason, PFRES_MEMORY); 7056 } 7057 7058 if (log) 7059 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset); 7060 7061 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7062 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7063 7064 if (action == PF_PASS || r->action == PF_DROP) { 7065 r->packets++; 7066 r->bytes += pd.tot_len; 7067 if (a != NULL) { 7068 a->packets++; 7069 a->bytes += pd.tot_len; 7070 } 7071 if (s != NULL) { 7072 dirndx = (dir == s->direction) ? 0 : 1; 7073 s->packets[dirndx]++; 7074 s->bytes[dirndx] += pd.tot_len; 7075 if (s->nat_rule.ptr != NULL) { 7076 s->nat_rule.ptr->packets++; 7077 s->nat_rule.ptr->bytes += pd.tot_len; 7078 } 7079 if (s->src_node != NULL) { 7080 s->src_node->packets++; 7081 s->src_node->bytes += pd.tot_len; 7082 } 7083 if (s->nat_src_node != NULL) { 7084 s->nat_src_node->packets++; 7085 s->nat_src_node->bytes += pd.tot_len; 7086 } 7087 } 7088 tr = r; 7089 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7090 if (nr != NULL) { 7091 struct pf_addr *x; 7092 /* 7093 * XXX: we need to make sure that the addresses 7094 * passed to pfr_update_stats() are the same than 7095 * the addresses used during matching (pfr_match) 7096 */ 7097 if (r == &pf_default_rule) { 7098 tr = nr; 7099 x = (s == NULL || s->direction == dir) ? 7100 &pd.baddr : &pd.naddr; 7101 } else { 7102 x = (s == NULL || s->direction == dir) ? 7103 &pd.naddr : &pd.baddr; 7104 } 7105 if (x == &pd.baddr || s == NULL) { 7106 if (dir == PF_OUT) 7107 pd.src = x; 7108 else 7109 pd.dst = x; 7110 } 7111 } 7112 if (tr->src.addr.type == PF_ADDR_TABLE) 7113 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7114 s->direction == dir) ? pd.src : pd.dst, pd.af, 7115 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7116 tr->src.neg); 7117 if (tr->dst.addr.type == PF_ADDR_TABLE) 7118 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7119 s->direction == dir) ? pd.dst : pd.src, pd.af, 7120 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7121 tr->dst.neg); 7122 } 7123 7124 7125 if (action == PF_SYNPROXY_DROP) { 7126 m_freem(*m0); 7127 *m0 = NULL; 7128 action = PF_PASS; 7129 } else if (r->rt) 7130 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7131 pf_route6(m0, r, dir, ifp, s); 7132 7133#ifdef __FreeBSD__ 7134 PF_UNLOCK(); 7135#endif 7136 return (action); 7137} 7138#endif /* INET6 */ 7139 7140int 7141pf_check_congestion(struct ifqueue *ifq) 7142{ 7143#ifdef __FreeBSD__ 7144 /* XXX_IMPORT: later */ 7145 return (0); 7146#else 7147 if (ifq->ifq_congestion) 7148 return (1); 7149 else 7150 return (0); 7151#endif 7152} 7153