pf.c revision 126258
1126258Smlaier/* $OpenBSD: pf.c,v 1.390 2003/09/24 17:18:03 mcbride Exp $ */ 2126258Smlaier 3126258Smlaier/* 4126258Smlaier * Copyright (c) 2001 Daniel Hartmeier 5126258Smlaier * All rights reserved. 6126258Smlaier * 7126258Smlaier * Redistribution and use in source and binary forms, with or without 8126258Smlaier * modification, are permitted provided that the following conditions 9126258Smlaier * are met: 10126258Smlaier * 11126258Smlaier * - Redistributions of source code must retain the above copyright 12126258Smlaier * notice, this list of conditions and the following disclaimer. 13126258Smlaier * - Redistributions in binary form must reproduce the above 14126258Smlaier * copyright notice, this list of conditions and the following 15126258Smlaier * disclaimer in the documentation and/or other materials provided 16126258Smlaier * with the distribution. 17126258Smlaier * 18126258Smlaier * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19126258Smlaier * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20126258Smlaier * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21126258Smlaier * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22126258Smlaier * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23126258Smlaier * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24126258Smlaier * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25126258Smlaier * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 26126258Smlaier * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27126258Smlaier * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 28126258Smlaier * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29126258Smlaier * POSSIBILITY OF SUCH DAMAGE. 30126258Smlaier * 31126258Smlaier * Effort sponsored in part by the Defense Advanced Research Projects 32126258Smlaier * Agency (DARPA) and Air Force Research Laboratory, Air Force 33126258Smlaier * Materiel Command, USAF, under agreement number F30602-01-2-0537. 34126258Smlaier * 35126258Smlaier */ 36126258Smlaier 37126258Smlaier#include "bpfilter.h" 38126258Smlaier#include "pflog.h" 39126258Smlaier#include "pfsync.h" 40126258Smlaier 41126258Smlaier#include <sys/param.h> 42126258Smlaier#include <sys/systm.h> 43126258Smlaier#include <sys/mbuf.h> 44126258Smlaier#include <sys/filio.h> 45126258Smlaier#include <sys/socket.h> 46126258Smlaier#include <sys/socketvar.h> 47126258Smlaier#include <sys/kernel.h> 48126258Smlaier#include <sys/time.h> 49126258Smlaier#include <sys/pool.h> 50126258Smlaier 51126258Smlaier#include <net/if.h> 52126258Smlaier#include <net/if_types.h> 53126258Smlaier#include <net/bpf.h> 54126258Smlaier#include <net/route.h> 55126258Smlaier 56126258Smlaier#include <netinet/in.h> 57126258Smlaier#include <netinet/in_var.h> 58126258Smlaier#include <netinet/in_systm.h> 59126258Smlaier#include <netinet/ip.h> 60126258Smlaier#include <netinet/ip_var.h> 61126258Smlaier#include <netinet/tcp.h> 62126258Smlaier#include <netinet/tcp_seq.h> 63126258Smlaier#include <netinet/udp.h> 64126258Smlaier#include <netinet/ip_icmp.h> 65126258Smlaier#include <netinet/in_pcb.h> 66126258Smlaier#include <netinet/tcp_timer.h> 67126258Smlaier#include <netinet/tcp_var.h> 68126258Smlaier#include <netinet/udp_var.h> 69126258Smlaier#include <netinet/icmp_var.h> 70126258Smlaier 71126258Smlaier#include <dev/rndvar.h> 72126258Smlaier#include <net/pfvar.h> 73126258Smlaier#include <net/if_pflog.h> 74126258Smlaier#include <net/if_pfsync.h> 75126258Smlaier 76126258Smlaier#ifdef INET6 77126258Smlaier#include <netinet/ip6.h> 78126258Smlaier#include <netinet/in_pcb.h> 79126258Smlaier#include <netinet/icmp6.h> 80126258Smlaier#include <netinet6/nd6.h> 81126258Smlaier#endif /* INET6 */ 82126258Smlaier 83126258Smlaier#ifdef ALTQ 84126258Smlaier#include <altq/if_altq.h> 85126258Smlaier#endif 86126258Smlaier 87126258Smlaier 88126258Smlaier#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x 89126258Smlaierstruct pf_state_tree; 90126258Smlaier 91126258Smlaier/* 92126258Smlaier * Global variables 93126258Smlaier */ 94126258Smlaier 95126258Smlaierstruct pf_anchorqueue pf_anchors; 96126258Smlaierstruct pf_ruleset pf_main_ruleset; 97126258Smlaierstruct pf_altqqueue pf_altqs[2]; 98126258Smlaierstruct pf_palist pf_pabuf; 99126258Smlaierstruct pf_altqqueue *pf_altqs_active; 100126258Smlaierstruct pf_altqqueue *pf_altqs_inactive; 101126258Smlaierstruct pf_status pf_status; 102126258Smlaierstruct ifnet *status_ifp; 103126258Smlaier 104126258Smlaieru_int32_t ticket_altqs_active; 105126258Smlaieru_int32_t ticket_altqs_inactive; 106126258Smlaieru_int32_t ticket_pabuf; 107126258Smlaier 108126258Smlaierstruct timeout pf_expire_to; /* expire timeout */ 109126258Smlaier 110126258Smlaierstruct pool pf_tree_pl, pf_rule_pl, pf_addr_pl; 111126258Smlaierstruct pool pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 112126258Smlaier 113126258Smlaiervoid pf_dynaddr_update(void *); 114126258Smlaiervoid pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 115126258Smlaiervoid pf_print_state(struct pf_state *); 116126258Smlaiervoid pf_print_flags(u_int8_t); 117126258Smlaier 118126258Smlaieru_int16_t pf_cksum_fixup(u_int16_t, u_int16_t, u_int16_t, 119126258Smlaier u_int8_t); 120126258Smlaiervoid pf_change_ap(struct pf_addr *, u_int16_t *, 121126258Smlaier u_int16_t *, u_int16_t *, struct pf_addr *, 122126258Smlaier u_int16_t, u_int8_t, sa_family_t); 123126258Smlaier#ifdef INET6 124126258Smlaiervoid pf_change_a6(struct pf_addr *, u_int16_t *, 125126258Smlaier struct pf_addr *, u_int8_t); 126126258Smlaier#endif /* INET6 */ 127126258Smlaiervoid pf_change_icmp(struct pf_addr *, u_int16_t *, 128126258Smlaier struct pf_addr *, struct pf_addr *, u_int16_t, 129126258Smlaier u_int16_t *, u_int16_t *, u_int16_t *, 130126258Smlaier u_int16_t *, u_int8_t, sa_family_t); 131126258Smlaiervoid pf_send_tcp(const struct pf_rule *, sa_family_t, 132126258Smlaier const struct pf_addr *, const struct pf_addr *, 133126258Smlaier u_int16_t, u_int16_t, u_int32_t, u_int32_t, 134126258Smlaier u_int8_t, u_int16_t, u_int16_t, u_int8_t); 135126258Smlaiervoid pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 136126258Smlaier sa_family_t, struct pf_rule *); 137126258Smlaierstruct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 138126258Smlaier int, int, struct ifnet *, 139126258Smlaier struct pf_addr *, u_int16_t, struct pf_addr *, 140126258Smlaier u_int16_t, int); 141126258Smlaierstruct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 142126258Smlaier int, int, struct ifnet *, 143126258Smlaier struct pf_addr *, u_int16_t, 144126258Smlaier struct pf_addr *, u_int16_t, 145126258Smlaier struct pf_addr *, u_int16_t *); 146126258Smlaierint pf_test_tcp(struct pf_rule **, struct pf_state **, 147126258Smlaier int, struct ifnet *, struct mbuf *, int, int, 148126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 149126258Smlaier struct pf_ruleset **); 150126258Smlaierint pf_test_udp(struct pf_rule **, struct pf_state **, 151126258Smlaier int, struct ifnet *, struct mbuf *, int, int, 152126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 153126258Smlaier struct pf_ruleset **); 154126258Smlaierint pf_test_icmp(struct pf_rule **, struct pf_state **, 155126258Smlaier int, struct ifnet *, struct mbuf *, int, int, 156126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 157126258Smlaier struct pf_ruleset **); 158126258Smlaierint pf_test_other(struct pf_rule **, struct pf_state **, 159126258Smlaier int, struct ifnet *, struct mbuf *, int, void *, 160126258Smlaier struct pf_pdesc *, struct pf_rule **, 161126258Smlaier struct pf_ruleset **); 162126258Smlaierint pf_test_fragment(struct pf_rule **, int, 163126258Smlaier struct ifnet *, struct mbuf *, void *, 164126258Smlaier struct pf_pdesc *, struct pf_rule **, 165126258Smlaier struct pf_ruleset **); 166126258Smlaierint pf_test_state_tcp(struct pf_state **, int, 167126258Smlaier struct ifnet *, struct mbuf *, int, int, 168126258Smlaier void *, struct pf_pdesc *, u_short *); 169126258Smlaierint pf_test_state_udp(struct pf_state **, int, 170126258Smlaier struct ifnet *, struct mbuf *, int, int, 171126258Smlaier void *, struct pf_pdesc *); 172126258Smlaierint pf_test_state_icmp(struct pf_state **, int, 173126258Smlaier struct ifnet *, struct mbuf *, int, int, 174126258Smlaier void *, struct pf_pdesc *); 175126258Smlaierint pf_test_state_other(struct pf_state **, int, 176126258Smlaier struct ifnet *, struct pf_pdesc *); 177126258Smlaierstruct pf_tag *pf_get_tag(struct mbuf *); 178126258Smlaierint pf_match_tag(struct mbuf *, struct pf_rule *, 179126258Smlaier struct pf_rule *, struct pf_rule *, 180126258Smlaier struct pf_tag *, int *); 181126258Smlaiervoid pf_hash(struct pf_addr *, struct pf_addr *, 182126258Smlaier struct pf_poolhashkey *, sa_family_t); 183126258Smlaierint pf_map_addr(u_int8_t, struct pf_pool *, 184126258Smlaier struct pf_addr *, struct pf_addr *, 185126258Smlaier struct pf_addr *); 186126258Smlaierint pf_get_sport(sa_family_t, u_int8_t, struct pf_pool *, 187126258Smlaier struct pf_addr *, struct pf_addr *, u_int16_t, 188126258Smlaier struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t); 189126258Smlaiervoid pf_route(struct mbuf **, struct pf_rule *, int, 190126258Smlaier struct ifnet *, struct pf_state *); 191126258Smlaiervoid pf_route6(struct mbuf **, struct pf_rule *, int, 192126258Smlaier struct ifnet *, struct pf_state *); 193126258Smlaierint pf_socket_lookup(uid_t *, gid_t *, int, sa_family_t, 194126258Smlaier int, struct pf_pdesc *); 195126258Smlaieru_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 196126258Smlaier sa_family_t); 197126258Smlaieru_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 198126258Smlaier sa_family_t); 199126258Smlaieru_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 200126258Smlaier u_int16_t); 201126258Smlaiervoid pf_set_rt_ifp(struct pf_state *, 202126258Smlaier struct pf_addr *); 203126258Smlaierint pf_check_proto_cksum(struct mbuf *, int, int, 204126258Smlaier u_int8_t, sa_family_t); 205126258Smlaierint pf_addr_wrap_neq(struct pf_addr_wrap *, 206126258Smlaier struct pf_addr_wrap *); 207126258Smlaier 208126258Smlaier 209126258Smlaierstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = 210126258Smlaier { { &pf_state_pl, PFSTATE_HIWAT }, { &pf_frent_pl, PFFRAG_FRENT_HIWAT } }; 211126258Smlaier 212126258Smlaier#define STATE_LOOKUP() \ 213126258Smlaier do { \ 214126258Smlaier if (direction == PF_IN) \ 215126258Smlaier *state = pf_find_state(&tree_ext_gwy, &key); \ 216126258Smlaier else \ 217126258Smlaier *state = pf_find_state(&tree_lan_ext, &key); \ 218126258Smlaier if (*state == NULL) \ 219126258Smlaier return (PF_DROP); \ 220126258Smlaier if (direction == PF_OUT && \ 221126258Smlaier (((*state)->rule.ptr->rt == PF_ROUTETO && \ 222126258Smlaier (*state)->rule.ptr->direction == PF_OUT) || \ 223126258Smlaier ((*state)->rule.ptr->rt == PF_REPLYTO && \ 224126258Smlaier (*state)->rule.ptr->direction == PF_IN)) && \ 225126258Smlaier (*state)->rt_ifp != NULL && \ 226126258Smlaier (*state)->rt_ifp != ifp) \ 227126258Smlaier return (PF_PASS); \ 228126258Smlaier } while (0) 229126258Smlaier 230126258Smlaier#define STATE_TRANSLATE(s) \ 231126258Smlaier (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ 232126258Smlaier ((s)->af == AF_INET6 && \ 233126258Smlaier ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ 234126258Smlaier (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ 235126258Smlaier (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ 236126258Smlaier (s)->lan.port != (s)->gwy.port 237126258Smlaier 238126258Smlaierstatic __inline int pf_state_compare(struct pf_tree_node *, 239126258Smlaier struct pf_tree_node *); 240126258Smlaier 241126258Smlaierstruct pf_state_tree tree_lan_ext, tree_ext_gwy; 242126258SmlaierRB_GENERATE(pf_state_tree, pf_tree_node, entry, pf_state_compare); 243126258Smlaier 244126258Smlaierstatic __inline int 245126258Smlaierpf_state_compare(struct pf_tree_node *a, struct pf_tree_node *b) 246126258Smlaier{ 247126258Smlaier int diff; 248126258Smlaier 249126258Smlaier if ((diff = a->proto - b->proto) != 0) 250126258Smlaier return (diff); 251126258Smlaier if ((diff = a->af - b->af) != 0) 252126258Smlaier return (diff); 253126258Smlaier switch (a->af) { 254126258Smlaier#ifdef INET 255126258Smlaier case AF_INET: 256126258Smlaier if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 257126258Smlaier return (1); 258126258Smlaier if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 259126258Smlaier return (-1); 260126258Smlaier if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 261126258Smlaier return (1); 262126258Smlaier if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 263126258Smlaier return (-1); 264126258Smlaier break; 265126258Smlaier#endif /* INET */ 266126258Smlaier#ifdef INET6 267126258Smlaier case AF_INET6: 268126258Smlaier if (a->addr[0].addr32[3] > b->addr[0].addr32[3]) 269126258Smlaier return (1); 270126258Smlaier if (a->addr[0].addr32[3] < b->addr[0].addr32[3]) 271126258Smlaier return (-1); 272126258Smlaier if (a->addr[1].addr32[3] > b->addr[1].addr32[3]) 273126258Smlaier return (1); 274126258Smlaier if (a->addr[1].addr32[3] < b->addr[1].addr32[3]) 275126258Smlaier return (-1); 276126258Smlaier if (a->addr[0].addr32[2] > b->addr[0].addr32[2]) 277126258Smlaier return (1); 278126258Smlaier if (a->addr[0].addr32[2] < b->addr[0].addr32[2]) 279126258Smlaier return (-1); 280126258Smlaier if (a->addr[1].addr32[2] > b->addr[1].addr32[2]) 281126258Smlaier return (1); 282126258Smlaier if (a->addr[1].addr32[2] < b->addr[1].addr32[2]) 283126258Smlaier return (-1); 284126258Smlaier if (a->addr[0].addr32[1] > b->addr[0].addr32[1]) 285126258Smlaier return (1); 286126258Smlaier if (a->addr[0].addr32[1] < b->addr[0].addr32[1]) 287126258Smlaier return (-1); 288126258Smlaier if (a->addr[1].addr32[1] > b->addr[1].addr32[1]) 289126258Smlaier return (1); 290126258Smlaier if (a->addr[1].addr32[1] < b->addr[1].addr32[1]) 291126258Smlaier return (-1); 292126258Smlaier if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 293126258Smlaier return (1); 294126258Smlaier if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 295126258Smlaier return (-1); 296126258Smlaier if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 297126258Smlaier return (1); 298126258Smlaier if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 299126258Smlaier return (-1); 300126258Smlaier break; 301126258Smlaier#endif /* INET6 */ 302126258Smlaier } 303126258Smlaier 304126258Smlaier if ((diff = a->port[0] - b->port[0]) != 0) 305126258Smlaier return (diff); 306126258Smlaier if ((diff = a->port[1] - b->port[1]) != 0) 307126258Smlaier return (diff); 308126258Smlaier 309126258Smlaier return (0); 310126258Smlaier} 311126258Smlaier 312126258Smlaier#ifdef INET6 313126258Smlaiervoid 314126258Smlaierpf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 315126258Smlaier{ 316126258Smlaier switch (af) { 317126258Smlaier#ifdef INET 318126258Smlaier case AF_INET: 319126258Smlaier dst->addr32[0] = src->addr32[0]; 320126258Smlaier break; 321126258Smlaier#endif /* INET */ 322126258Smlaier case AF_INET6: 323126258Smlaier dst->addr32[0] = src->addr32[0]; 324126258Smlaier dst->addr32[1] = src->addr32[1]; 325126258Smlaier dst->addr32[2] = src->addr32[2]; 326126258Smlaier dst->addr32[3] = src->addr32[3]; 327126258Smlaier break; 328126258Smlaier } 329126258Smlaier} 330126258Smlaier#endif 331126258Smlaier 332126258Smlaierstruct pf_state * 333126258Smlaierpf_find_state(struct pf_state_tree *tree, struct pf_tree_node *key) 334126258Smlaier{ 335126258Smlaier struct pf_tree_node *k; 336126258Smlaier 337126258Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 338126258Smlaier k = RB_FIND(pf_state_tree, tree, key); 339126258Smlaier if (k) 340126258Smlaier return (k->state); 341126258Smlaier else 342126258Smlaier return (NULL); 343126258Smlaier} 344126258Smlaier 345126258Smlaierint 346126258Smlaierpf_insert_state(struct pf_state *state) 347126258Smlaier{ 348126258Smlaier struct pf_tree_node *keya, *keyb; 349126258Smlaier 350126258Smlaier keya = pool_get(&pf_tree_pl, PR_NOWAIT); 351126258Smlaier if (keya == NULL) 352126258Smlaier return (-1); 353126258Smlaier keya->state = state; 354126258Smlaier keya->proto = state->proto; 355126258Smlaier keya->af = state->af; 356126258Smlaier PF_ACPY(&keya->addr[0], &state->lan.addr, state->af); 357126258Smlaier keya->port[0] = state->lan.port; 358126258Smlaier PF_ACPY(&keya->addr[1], &state->ext.addr, state->af); 359126258Smlaier keya->port[1] = state->ext.port; 360126258Smlaier 361126258Smlaier /* Thou MUST NOT insert multiple duplicate keys */ 362126258Smlaier if (RB_INSERT(pf_state_tree, &tree_lan_ext, keya) != NULL) { 363126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 364126258Smlaier printf("pf: state insert failed: tree_lan_ext"); 365126258Smlaier printf(" lan: "); 366126258Smlaier pf_print_host(&state->lan.addr, state->lan.port, 367126258Smlaier state->af); 368126258Smlaier printf(" gwy: "); 369126258Smlaier pf_print_host(&state->gwy.addr, state->gwy.port, 370126258Smlaier state->af); 371126258Smlaier printf(" ext: "); 372126258Smlaier pf_print_host(&state->ext.addr, state->ext.port, 373126258Smlaier state->af); 374126258Smlaier printf("\n"); 375126258Smlaier } 376126258Smlaier pool_put(&pf_tree_pl, keya); 377126258Smlaier return (-1); 378126258Smlaier } 379126258Smlaier 380126258Smlaier keyb = pool_get(&pf_tree_pl, PR_NOWAIT); 381126258Smlaier if (keyb == NULL) { 382126258Smlaier /* Need to pull out the other state */ 383126258Smlaier RB_REMOVE(pf_state_tree, &tree_lan_ext, keya); 384126258Smlaier pool_put(&pf_tree_pl, keya); 385126258Smlaier return (-1); 386126258Smlaier } 387126258Smlaier keyb->state = state; 388126258Smlaier keyb->proto = state->proto; 389126258Smlaier keyb->af = state->af; 390126258Smlaier PF_ACPY(&keyb->addr[0], &state->ext.addr, state->af); 391126258Smlaier keyb->port[0] = state->ext.port; 392126258Smlaier PF_ACPY(&keyb->addr[1], &state->gwy.addr, state->af); 393126258Smlaier keyb->port[1] = state->gwy.port; 394126258Smlaier 395126258Smlaier if (RB_INSERT(pf_state_tree, &tree_ext_gwy, keyb) != NULL) { 396126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 397126258Smlaier printf("pf: state insert failed: tree_ext_gwy"); 398126258Smlaier printf(" lan: "); 399126258Smlaier pf_print_host(&state->lan.addr, state->lan.port, 400126258Smlaier state->af); 401126258Smlaier printf(" gwy: "); 402126258Smlaier pf_print_host(&state->gwy.addr, state->gwy.port, 403126258Smlaier state->af); 404126258Smlaier printf(" ext: "); 405126258Smlaier pf_print_host(&state->ext.addr, state->ext.port, 406126258Smlaier state->af); 407126258Smlaier printf("\n"); 408126258Smlaier } 409126258Smlaier RB_REMOVE(pf_state_tree, &tree_lan_ext, keya); 410126258Smlaier pool_put(&pf_tree_pl, keya); 411126258Smlaier pool_put(&pf_tree_pl, keyb); 412126258Smlaier return (-1); 413126258Smlaier } 414126258Smlaier 415126258Smlaier pf_status.fcounters[FCNT_STATE_INSERT]++; 416126258Smlaier pf_status.states++; 417126258Smlaier#if NPFSYNC 418126258Smlaier pfsync_insert_state(state); 419126258Smlaier#endif 420126258Smlaier return (0); 421126258Smlaier} 422126258Smlaier 423126258Smlaiervoid 424126258Smlaierpf_purge_timeout(void *arg) 425126258Smlaier{ 426126258Smlaier struct timeout *to = arg; 427126258Smlaier int s; 428126258Smlaier 429126258Smlaier s = splsoftnet(); 430126258Smlaier pf_purge_expired_states(); 431126258Smlaier pf_purge_expired_fragments(); 432126258Smlaier splx(s); 433126258Smlaier 434126258Smlaier timeout_add(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz); 435126258Smlaier} 436126258Smlaier 437126258Smlaieru_int32_t 438126258Smlaierpf_state_expires(const struct pf_state *state) 439126258Smlaier{ 440126258Smlaier u_int32_t timeout; 441126258Smlaier u_int32_t start; 442126258Smlaier u_int32_t end; 443126258Smlaier u_int32_t states; 444126258Smlaier 445126258Smlaier /* handle all PFTM_* > PFTM_MAX here */ 446126258Smlaier if (state->timeout == PFTM_PURGE) 447126258Smlaier return (time.tv_sec); 448126258Smlaier if (state->timeout == PFTM_UNTIL_PACKET) 449126258Smlaier return (0); 450126258Smlaier KASSERT(state->timeout < PFTM_MAX); 451126258Smlaier timeout = state->rule.ptr->timeout[state->timeout]; 452126258Smlaier if (!timeout) 453126258Smlaier timeout = pf_default_rule.timeout[state->timeout]; 454126258Smlaier start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 455126258Smlaier if (start) { 456126258Smlaier end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 457126258Smlaier states = state->rule.ptr->states; 458126258Smlaier } else { 459126258Smlaier start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 460126258Smlaier end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 461126258Smlaier states = pf_status.states; 462126258Smlaier } 463126258Smlaier if (end && states > start && start < end) { 464126258Smlaier if (states < end) 465126258Smlaier return (state->expire + timeout * (end - states) / 466126258Smlaier (end - start)); 467126258Smlaier else 468126258Smlaier return (time.tv_sec); 469126258Smlaier } 470126258Smlaier return (state->expire + timeout); 471126258Smlaier} 472126258Smlaier 473126258Smlaiervoid 474126258Smlaierpf_purge_expired_states(void) 475126258Smlaier{ 476126258Smlaier struct pf_tree_node *cur, *peer, *next; 477126258Smlaier struct pf_tree_node key; 478126258Smlaier 479126258Smlaier for (cur = RB_MIN(pf_state_tree, &tree_ext_gwy); cur; cur = next) { 480126258Smlaier next = RB_NEXT(pf_state_tree, &tree_ext_gwy, cur); 481126258Smlaier 482126258Smlaier if (pf_state_expires(cur->state) <= time.tv_sec) { 483126258Smlaier if (cur->state->src.state == PF_TCPS_PROXY_DST) 484126258Smlaier pf_send_tcp(cur->state->rule.ptr, 485126258Smlaier cur->state->af, 486126258Smlaier &cur->state->ext.addr, 487126258Smlaier &cur->state->lan.addr, 488126258Smlaier cur->state->ext.port, 489126258Smlaier cur->state->lan.port, 490126258Smlaier cur->state->src.seqhi, 491126258Smlaier cur->state->src.seqlo + 1, 492126258Smlaier 0, 493126258Smlaier TH_RST|TH_ACK, 0, 0); 494126258Smlaier RB_REMOVE(pf_state_tree, &tree_ext_gwy, cur); 495126258Smlaier 496126258Smlaier /* Need this key's peer (in the other tree) */ 497126258Smlaier key.state = cur->state; 498126258Smlaier key.proto = cur->state->proto; 499126258Smlaier key.af = cur->state->af; 500126258Smlaier PF_ACPY(&key.addr[0], &cur->state->lan.addr, 501126258Smlaier cur->state->af); 502126258Smlaier key.port[0] = cur->state->lan.port; 503126258Smlaier PF_ACPY(&key.addr[1], &cur->state->ext.addr, 504126258Smlaier cur->state->af); 505126258Smlaier key.port[1] = cur->state->ext.port; 506126258Smlaier 507126258Smlaier peer = RB_FIND(pf_state_tree, &tree_lan_ext, &key); 508126258Smlaier KASSERT(peer); 509126258Smlaier KASSERT(peer->state == cur->state); 510126258Smlaier RB_REMOVE(pf_state_tree, &tree_lan_ext, peer); 511126258Smlaier 512126258Smlaier#if NPFSYNC 513126258Smlaier pfsync_delete_state(cur->state); 514126258Smlaier#endif 515126258Smlaier if (--cur->state->rule.ptr->states <= 0) 516126258Smlaier pf_rm_rule(NULL, cur->state->rule.ptr); 517126258Smlaier if (cur->state->nat_rule.ptr != NULL) 518126258Smlaier if (--cur->state->nat_rule.ptr->states <= 0) 519126258Smlaier pf_rm_rule(NULL, 520126258Smlaier cur->state->nat_rule.ptr); 521126258Smlaier if (cur->state->anchor.ptr != NULL) 522126258Smlaier if (--cur->state->anchor.ptr->states <= 0) 523126258Smlaier pf_rm_rule(NULL, 524126258Smlaier cur->state->anchor.ptr); 525126258Smlaier pf_normalize_tcp_cleanup(cur->state); 526126258Smlaier pool_put(&pf_state_pl, cur->state); 527126258Smlaier pool_put(&pf_tree_pl, cur); 528126258Smlaier pool_put(&pf_tree_pl, peer); 529126258Smlaier pf_status.fcounters[FCNT_STATE_REMOVALS]++; 530126258Smlaier pf_status.states--; 531126258Smlaier } 532126258Smlaier } 533126258Smlaier} 534126258Smlaier 535126258Smlaierint 536126258Smlaierpf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 537126258Smlaier{ 538126258Smlaier if (aw->type != PF_ADDR_TABLE) 539126258Smlaier return (0); 540126258Smlaier if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 541126258Smlaier return (1); 542126258Smlaier return (0); 543126258Smlaier} 544126258Smlaier 545126258Smlaiervoid 546126258Smlaierpf_tbladdr_remove(struct pf_addr_wrap *aw) 547126258Smlaier{ 548126258Smlaier if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 549126258Smlaier return; 550126258Smlaier pfr_detach_table(aw->p.tbl); 551126258Smlaier aw->p.tbl = NULL; 552126258Smlaier} 553126258Smlaier 554126258Smlaiervoid 555126258Smlaierpf_tbladdr_copyout(struct pf_addr_wrap *aw) 556126258Smlaier{ 557126258Smlaier struct pfr_ktable *kt = aw->p.tbl; 558126258Smlaier 559126258Smlaier if (aw->type != PF_ADDR_TABLE || kt == NULL) 560126258Smlaier return; 561126258Smlaier if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 562126258Smlaier kt = kt->pfrkt_root; 563126258Smlaier aw->p.tbl = NULL; 564126258Smlaier aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 565126258Smlaier kt->pfrkt_cnt : -1; 566126258Smlaier} 567126258Smlaier 568126258Smlaierint 569126258Smlaierpf_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af) 570126258Smlaier{ 571126258Smlaier if (aw->type != PF_ADDR_DYNIFTL) 572126258Smlaier return (0); 573126258Smlaier aw->p.dyn = pool_get(&pf_addr_pl, PR_NOWAIT); 574126258Smlaier if (aw->p.dyn == NULL) 575126258Smlaier return (1); 576126258Smlaier bcopy(aw->v.ifname, aw->p.dyn->ifname, sizeof(aw->p.dyn->ifname)); 577126258Smlaier aw->p.dyn->ifp = ifunit(aw->p.dyn->ifname); 578126258Smlaier if (aw->p.dyn->ifp == NULL) { 579126258Smlaier pool_put(&pf_addr_pl, aw->p.dyn); 580126258Smlaier aw->p.dyn = NULL; 581126258Smlaier return (1); 582126258Smlaier } 583126258Smlaier aw->p.dyn->addr = &aw->v.a.addr; 584126258Smlaier aw->p.dyn->af = af; 585126258Smlaier aw->p.dyn->undefined = 1; 586126258Smlaier aw->p.dyn->hook_cookie = hook_establish( 587126258Smlaier aw->p.dyn->ifp->if_addrhooks, 1, 588126258Smlaier pf_dynaddr_update, aw->p.dyn); 589126258Smlaier if (aw->p.dyn->hook_cookie == NULL) { 590126258Smlaier pool_put(&pf_addr_pl, aw->p.dyn); 591126258Smlaier aw->p.dyn = NULL; 592126258Smlaier return (1); 593126258Smlaier } 594126258Smlaier pf_dynaddr_update(aw->p.dyn); 595126258Smlaier return (0); 596126258Smlaier} 597126258Smlaier 598126258Smlaiervoid 599126258Smlaierpf_dynaddr_update(void *p) 600126258Smlaier{ 601126258Smlaier struct pf_addr_dyn *ad = (struct pf_addr_dyn *)p; 602126258Smlaier struct ifaddr *ia; 603126258Smlaier int s, changed = 0; 604126258Smlaier 605126258Smlaier if (ad == NULL || ad->ifp == NULL) 606126258Smlaier panic("pf_dynaddr_update"); 607126258Smlaier s = splsoftnet(); 608126258Smlaier TAILQ_FOREACH(ia, &ad->ifp->if_addrlist, ifa_list) 609126258Smlaier if (ia->ifa_addr != NULL && 610126258Smlaier ia->ifa_addr->sa_family == ad->af) { 611126258Smlaier if (ad->af == AF_INET) { 612126258Smlaier struct in_addr *a, *b; 613126258Smlaier 614126258Smlaier a = &ad->addr->v4; 615126258Smlaier b = &((struct sockaddr_in *)ia->ifa_addr) 616126258Smlaier ->sin_addr; 617126258Smlaier if (ad->undefined || 618126258Smlaier memcmp(a, b, sizeof(*a))) { 619126258Smlaier bcopy(b, a, sizeof(*a)); 620126258Smlaier changed = 1; 621126258Smlaier } 622126258Smlaier } else if (ad->af == AF_INET6) { 623126258Smlaier struct in6_addr *a, *b; 624126258Smlaier 625126258Smlaier a = &ad->addr->v6; 626126258Smlaier b = &((struct sockaddr_in6 *)ia->ifa_addr) 627126258Smlaier ->sin6_addr; 628126258Smlaier if (ad->undefined || 629126258Smlaier memcmp(a, b, sizeof(*a))) { 630126258Smlaier bcopy(b, a, sizeof(*a)); 631126258Smlaier changed = 1; 632126258Smlaier } 633126258Smlaier } 634126258Smlaier if (changed) 635126258Smlaier ad->undefined = 0; 636126258Smlaier break; 637126258Smlaier } 638126258Smlaier if (ia == NULL) 639126258Smlaier ad->undefined = 1; 640126258Smlaier splx(s); 641126258Smlaier} 642126258Smlaier 643126258Smlaiervoid 644126258Smlaierpf_dynaddr_remove(struct pf_addr_wrap *aw) 645126258Smlaier{ 646126258Smlaier if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL) 647126258Smlaier return; 648126258Smlaier hook_disestablish(aw->p.dyn->ifp->if_addrhooks, 649126258Smlaier aw->p.dyn->hook_cookie); 650126258Smlaier pool_put(&pf_addr_pl, aw->p.dyn); 651126258Smlaier aw->p.dyn = NULL; 652126258Smlaier} 653126258Smlaier 654126258Smlaiervoid 655126258Smlaierpf_dynaddr_copyout(struct pf_addr_wrap *aw) 656126258Smlaier{ 657126258Smlaier if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL) 658126258Smlaier return; 659126258Smlaier bcopy(aw->p.dyn->ifname, aw->v.ifname, sizeof(aw->v.ifname)); 660126258Smlaier aw->p.dyn = (struct pf_addr_dyn *)1; 661126258Smlaier} 662126258Smlaier 663126258Smlaiervoid 664126258Smlaierpf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 665126258Smlaier{ 666126258Smlaier switch (af) { 667126258Smlaier#ifdef INET 668126258Smlaier case AF_INET: { 669126258Smlaier u_int32_t a = ntohl(addr->addr32[0]); 670126258Smlaier printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 671126258Smlaier (a>>8)&255, a&255); 672126258Smlaier if (p) { 673126258Smlaier p = ntohs(p); 674126258Smlaier printf(":%u", p); 675126258Smlaier } 676126258Smlaier break; 677126258Smlaier } 678126258Smlaier#endif /* INET */ 679126258Smlaier#ifdef INET6 680126258Smlaier case AF_INET6: { 681126258Smlaier u_int16_t b; 682126258Smlaier u_int8_t i, curstart = 255, curend = 0, 683126258Smlaier maxstart = 0, maxend = 0; 684126258Smlaier for (i = 0; i < 8; i++) { 685126258Smlaier if (!addr->addr16[i]) { 686126258Smlaier if (curstart == 255) 687126258Smlaier curstart = i; 688126258Smlaier else 689126258Smlaier curend = i; 690126258Smlaier } else { 691126258Smlaier if (curstart) { 692126258Smlaier if ((curend - curstart) > 693126258Smlaier (maxend - maxstart)) { 694126258Smlaier maxstart = curstart; 695126258Smlaier maxend = curend; 696126258Smlaier curstart = 255; 697126258Smlaier } 698126258Smlaier } 699126258Smlaier } 700126258Smlaier } 701126258Smlaier for (i = 0; i < 8; i++) { 702126258Smlaier if (i >= maxstart && i <= maxend) { 703126258Smlaier if (maxend != 7) { 704126258Smlaier if (i == maxstart) 705126258Smlaier printf(":"); 706126258Smlaier } else { 707126258Smlaier if (i == maxend) 708126258Smlaier printf(":"); 709126258Smlaier } 710126258Smlaier } else { 711126258Smlaier b = ntohs(addr->addr16[i]); 712126258Smlaier printf("%x", b); 713126258Smlaier if (i < 7) 714126258Smlaier printf(":"); 715126258Smlaier } 716126258Smlaier } 717126258Smlaier if (p) { 718126258Smlaier p = ntohs(p); 719126258Smlaier printf("[%u]", p); 720126258Smlaier } 721126258Smlaier break; 722126258Smlaier } 723126258Smlaier#endif /* INET6 */ 724126258Smlaier } 725126258Smlaier} 726126258Smlaier 727126258Smlaiervoid 728126258Smlaierpf_print_state(struct pf_state *s) 729126258Smlaier{ 730126258Smlaier switch (s->proto) { 731126258Smlaier case IPPROTO_TCP: 732126258Smlaier printf("TCP "); 733126258Smlaier break; 734126258Smlaier case IPPROTO_UDP: 735126258Smlaier printf("UDP "); 736126258Smlaier break; 737126258Smlaier case IPPROTO_ICMP: 738126258Smlaier printf("ICMP "); 739126258Smlaier break; 740126258Smlaier case IPPROTO_ICMPV6: 741126258Smlaier printf("ICMPV6 "); 742126258Smlaier break; 743126258Smlaier default: 744126258Smlaier printf("%u ", s->proto); 745126258Smlaier break; 746126258Smlaier } 747126258Smlaier pf_print_host(&s->lan.addr, s->lan.port, s->af); 748126258Smlaier printf(" "); 749126258Smlaier pf_print_host(&s->gwy.addr, s->gwy.port, s->af); 750126258Smlaier printf(" "); 751126258Smlaier pf_print_host(&s->ext.addr, s->ext.port, s->af); 752126258Smlaier printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 753126258Smlaier s->src.seqhi, s->src.max_win, s->src.seqdiff); 754126258Smlaier if (s->src.wscale && s->dst.wscale) 755126258Smlaier printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 756126258Smlaier printf("]"); 757126258Smlaier printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 758126258Smlaier s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 759126258Smlaier if (s->src.wscale && s->dst.wscale) 760126258Smlaier printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 761126258Smlaier printf("]"); 762126258Smlaier printf(" %u:%u", s->src.state, s->dst.state); 763126258Smlaier} 764126258Smlaier 765126258Smlaiervoid 766126258Smlaierpf_print_flags(u_int8_t f) 767126258Smlaier{ 768126258Smlaier if (f) 769126258Smlaier printf(" "); 770126258Smlaier if (f & TH_FIN) 771126258Smlaier printf("F"); 772126258Smlaier if (f & TH_SYN) 773126258Smlaier printf("S"); 774126258Smlaier if (f & TH_RST) 775126258Smlaier printf("R"); 776126258Smlaier if (f & TH_PUSH) 777126258Smlaier printf("P"); 778126258Smlaier if (f & TH_ACK) 779126258Smlaier printf("A"); 780126258Smlaier if (f & TH_URG) 781126258Smlaier printf("U"); 782126258Smlaier if (f & TH_ECE) 783126258Smlaier printf("E"); 784126258Smlaier if (f & TH_CWR) 785126258Smlaier printf("W"); 786126258Smlaier} 787126258Smlaier 788126258Smlaier#define PF_SET_SKIP_STEPS(i) \ 789126258Smlaier do { \ 790126258Smlaier while (head[i] != cur) { \ 791126258Smlaier head[i]->skip[i].ptr = cur; \ 792126258Smlaier head[i] = TAILQ_NEXT(head[i], entries); \ 793126258Smlaier } \ 794126258Smlaier } while (0) 795126258Smlaier 796126258Smlaiervoid 797126258Smlaierpf_calc_skip_steps(struct pf_rulequeue *rules) 798126258Smlaier{ 799126258Smlaier struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 800126258Smlaier int i; 801126258Smlaier 802126258Smlaier cur = TAILQ_FIRST(rules); 803126258Smlaier prev = cur; 804126258Smlaier for (i = 0; i < PF_SKIP_COUNT; ++i) 805126258Smlaier head[i] = cur; 806126258Smlaier while (cur != NULL) { 807126258Smlaier 808126258Smlaier if (cur->ifp != prev->ifp || cur->ifnot != prev->ifnot) 809126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_IFP); 810126258Smlaier if (cur->direction != prev->direction) 811126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DIR); 812126258Smlaier if (cur->af != prev->af) 813126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_AF); 814126258Smlaier if (cur->proto != prev->proto) 815126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 816126258Smlaier if (cur->src.not != prev->src.not || 817126258Smlaier pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 818126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 819126258Smlaier if (cur->src.port[0] != prev->src.port[0] || 820126258Smlaier cur->src.port[1] != prev->src.port[1] || 821126258Smlaier cur->src.port_op != prev->src.port_op) 822126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 823126258Smlaier if (cur->dst.not != prev->dst.not || 824126258Smlaier pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 825126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 826126258Smlaier if (cur->dst.port[0] != prev->dst.port[0] || 827126258Smlaier cur->dst.port[1] != prev->dst.port[1] || 828126258Smlaier cur->dst.port_op != prev->dst.port_op) 829126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 830126258Smlaier 831126258Smlaier prev = cur; 832126258Smlaier cur = TAILQ_NEXT(cur, entries); 833126258Smlaier } 834126258Smlaier for (i = 0; i < PF_SKIP_COUNT; ++i) 835126258Smlaier PF_SET_SKIP_STEPS(i); 836126258Smlaier} 837126258Smlaier 838126258Smlaierint 839126258Smlaierpf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 840126258Smlaier{ 841126258Smlaier if (aw1->type != aw2->type) 842126258Smlaier return (1); 843126258Smlaier switch (aw1->type) { 844126258Smlaier case PF_ADDR_ADDRMASK: 845126258Smlaier if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 846126258Smlaier return (1); 847126258Smlaier if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 848126258Smlaier return (1); 849126258Smlaier return (0); 850126258Smlaier case PF_ADDR_DYNIFTL: 851126258Smlaier if (aw1->p.dyn->ifp != aw2->p.dyn->ifp) 852126258Smlaier return (1); 853126258Smlaier if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 854126258Smlaier return (1); 855126258Smlaier return (0); 856126258Smlaier case PF_ADDR_NOROUTE: 857126258Smlaier return (0); 858126258Smlaier case PF_ADDR_TABLE: 859126258Smlaier return (aw1->p.tbl != aw2->p.tbl); 860126258Smlaier default: 861126258Smlaier printf("invalid address type: %d\n", aw1->type); 862126258Smlaier return (1); 863126258Smlaier } 864126258Smlaier} 865126258Smlaier 866126258Smlaiervoid 867126258Smlaierpf_rule_set_qid(struct pf_rulequeue *rules) 868126258Smlaier{ 869126258Smlaier struct pf_rule *rule; 870126258Smlaier 871126258Smlaier TAILQ_FOREACH(rule, rules, entries) 872126258Smlaier if (rule->qname[0] != 0) { 873126258Smlaier rule->qid = pf_qname_to_qid(rule->qname); 874126258Smlaier if (rule->pqname[0] != 0) 875126258Smlaier rule->pqid = pf_qname_to_qid(rule->pqname); 876126258Smlaier else 877126258Smlaier rule->pqid = rule->qid; 878126258Smlaier } 879126258Smlaier} 880126258Smlaier 881126258Smlaieru_int32_t 882126258Smlaierpf_qname_to_qid(char *qname) 883126258Smlaier{ 884126258Smlaier struct pf_altq *altq; 885126258Smlaier 886126258Smlaier TAILQ_FOREACH(altq, pf_altqs_active, entries) 887126258Smlaier if (!strcmp(altq->qname, qname)) 888126258Smlaier return (altq->qid); 889126258Smlaier 890126258Smlaier return (0); 891126258Smlaier} 892126258Smlaier 893126258Smlaiervoid 894126258Smlaierpf_update_anchor_rules() 895126258Smlaier{ 896126258Smlaier struct pf_rule *rule; 897126258Smlaier int i; 898126258Smlaier 899126258Smlaier for (i = 0; i < PF_RULESET_MAX; ++i) 900126258Smlaier TAILQ_FOREACH(rule, pf_main_ruleset.rules[i].active.ptr, 901126258Smlaier entries) 902126258Smlaier if (rule->anchorname[0]) 903126258Smlaier rule->anchor = pf_find_anchor(rule->anchorname); 904126258Smlaier else 905126258Smlaier rule->anchor = NULL; 906126258Smlaier} 907126258Smlaier 908126258Smlaieru_int16_t 909126258Smlaierpf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 910126258Smlaier{ 911126258Smlaier u_int32_t l; 912126258Smlaier 913126258Smlaier if (udp && !cksum) 914126258Smlaier return (0x0000); 915126258Smlaier l = cksum + old - new; 916126258Smlaier l = (l >> 16) + (l & 65535); 917126258Smlaier l = l & 65535; 918126258Smlaier if (udp && !l) 919126258Smlaier return (0xFFFF); 920126258Smlaier return (l); 921126258Smlaier} 922126258Smlaier 923126258Smlaiervoid 924126258Smlaierpf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 925126258Smlaier struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 926126258Smlaier{ 927126258Smlaier struct pf_addr ao; 928126258Smlaier u_int16_t po = *p; 929126258Smlaier 930126258Smlaier PF_ACPY(&ao, a, af); 931126258Smlaier PF_ACPY(a, an, af); 932126258Smlaier 933126258Smlaier *p = pn; 934126258Smlaier 935126258Smlaier switch (af) { 936126258Smlaier#ifdef INET 937126258Smlaier case AF_INET: 938126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 939126258Smlaier ao.addr16[0], an->addr16[0], 0), 940126258Smlaier ao.addr16[1], an->addr16[1], 0); 941126258Smlaier *p = pn; 942126258Smlaier *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 943126258Smlaier ao.addr16[0], an->addr16[0], u), 944126258Smlaier ao.addr16[1], an->addr16[1], u), 945126258Smlaier po, pn, u); 946126258Smlaier break; 947126258Smlaier#endif /* INET */ 948126258Smlaier#ifdef INET6 949126258Smlaier case AF_INET6: 950126258Smlaier *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 951126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 952126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 953126258Smlaier ao.addr16[0], an->addr16[0], u), 954126258Smlaier ao.addr16[1], an->addr16[1], u), 955126258Smlaier ao.addr16[2], an->addr16[2], u), 956126258Smlaier ao.addr16[3], an->addr16[3], u), 957126258Smlaier ao.addr16[4], an->addr16[4], u), 958126258Smlaier ao.addr16[5], an->addr16[5], u), 959126258Smlaier ao.addr16[6], an->addr16[6], u), 960126258Smlaier ao.addr16[7], an->addr16[7], u), 961126258Smlaier po, pn, u); 962126258Smlaier break; 963126258Smlaier#endif /* INET6 */ 964126258Smlaier } 965126258Smlaier} 966126258Smlaier 967126258Smlaier 968126258Smlaier/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 969126258Smlaiervoid 970126258Smlaierpf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 971126258Smlaier{ 972126258Smlaier u_int32_t ao; 973126258Smlaier 974126258Smlaier memcpy(&ao, a, sizeof(ao)); 975126258Smlaier memcpy(a, &an, sizeof(u_int32_t)); 976126258Smlaier *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 977126258Smlaier ao % 65536, an % 65536, u); 978126258Smlaier} 979126258Smlaier 980126258Smlaier#ifdef INET6 981126258Smlaiervoid 982126258Smlaierpf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 983126258Smlaier{ 984126258Smlaier struct pf_addr ao; 985126258Smlaier 986126258Smlaier PF_ACPY(&ao, a, AF_INET6); 987126258Smlaier PF_ACPY(a, an, AF_INET6); 988126258Smlaier 989126258Smlaier *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 990126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 991126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*c, 992126258Smlaier ao.addr16[0], an->addr16[0], u), 993126258Smlaier ao.addr16[1], an->addr16[1], u), 994126258Smlaier ao.addr16[2], an->addr16[2], u), 995126258Smlaier ao.addr16[3], an->addr16[3], u), 996126258Smlaier ao.addr16[4], an->addr16[4], u), 997126258Smlaier ao.addr16[5], an->addr16[5], u), 998126258Smlaier ao.addr16[6], an->addr16[6], u), 999126258Smlaier ao.addr16[7], an->addr16[7], u); 1000126258Smlaier} 1001126258Smlaier#endif /* INET6 */ 1002126258Smlaier 1003126258Smlaiervoid 1004126258Smlaierpf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1005126258Smlaier struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1006126258Smlaier u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1007126258Smlaier{ 1008126258Smlaier struct pf_addr oia, ooa; 1009126258Smlaier 1010126258Smlaier PF_ACPY(&oia, ia, af); 1011126258Smlaier PF_ACPY(&ooa, oa, af); 1012126258Smlaier 1013126258Smlaier /* Change inner protocol port, fix inner protocol checksum. */ 1014126258Smlaier if (ip != NULL) { 1015126258Smlaier u_int16_t oip = *ip; 1016126258Smlaier u_int32_t opc; 1017126258Smlaier 1018126258Smlaier if (pc != NULL) 1019126258Smlaier opc = *pc; 1020126258Smlaier *ip = np; 1021126258Smlaier if (pc != NULL) 1022126258Smlaier *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1023126258Smlaier *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1024126258Smlaier if (pc != NULL) 1025126258Smlaier *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1026126258Smlaier } 1027126258Smlaier /* Change inner ip address, fix inner ip and icmp checksums. */ 1028126258Smlaier PF_ACPY(ia, na, af); 1029126258Smlaier switch (af) { 1030126258Smlaier#ifdef INET 1031126258Smlaier case AF_INET: { 1032126258Smlaier u_int32_t oh2c = *h2c; 1033126258Smlaier 1034126258Smlaier *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1035126258Smlaier oia.addr16[0], ia->addr16[0], 0), 1036126258Smlaier oia.addr16[1], ia->addr16[1], 0); 1037126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1038126258Smlaier oia.addr16[0], ia->addr16[0], 0), 1039126258Smlaier oia.addr16[1], ia->addr16[1], 0); 1040126258Smlaier *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1041126258Smlaier break; 1042126258Smlaier } 1043126258Smlaier#endif /* INET */ 1044126258Smlaier#ifdef INET6 1045126258Smlaier case AF_INET6: 1046126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1047126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1048126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*ic, 1049126258Smlaier oia.addr16[0], ia->addr16[0], u), 1050126258Smlaier oia.addr16[1], ia->addr16[1], u), 1051126258Smlaier oia.addr16[2], ia->addr16[2], u), 1052126258Smlaier oia.addr16[3], ia->addr16[3], u), 1053126258Smlaier oia.addr16[4], ia->addr16[4], u), 1054126258Smlaier oia.addr16[5], ia->addr16[5], u), 1055126258Smlaier oia.addr16[6], ia->addr16[6], u), 1056126258Smlaier oia.addr16[7], ia->addr16[7], u); 1057126258Smlaier break; 1058126258Smlaier#endif /* INET6 */ 1059126258Smlaier } 1060126258Smlaier /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1061126258Smlaier PF_ACPY(oa, na, af); 1062126258Smlaier switch (af) { 1063126258Smlaier#ifdef INET 1064126258Smlaier case AF_INET: 1065126258Smlaier *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1066126258Smlaier ooa.addr16[0], oa->addr16[0], 0), 1067126258Smlaier ooa.addr16[1], oa->addr16[1], 0); 1068126258Smlaier break; 1069126258Smlaier#endif /* INET */ 1070126258Smlaier#ifdef INET6 1071126258Smlaier case AF_INET6: 1072126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1073126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1074126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*ic, 1075126258Smlaier ooa.addr16[0], oa->addr16[0], u), 1076126258Smlaier ooa.addr16[1], oa->addr16[1], u), 1077126258Smlaier ooa.addr16[2], oa->addr16[2], u), 1078126258Smlaier ooa.addr16[3], oa->addr16[3], u), 1079126258Smlaier ooa.addr16[4], oa->addr16[4], u), 1080126258Smlaier ooa.addr16[5], oa->addr16[5], u), 1081126258Smlaier ooa.addr16[6], oa->addr16[6], u), 1082126258Smlaier ooa.addr16[7], oa->addr16[7], u); 1083126258Smlaier break; 1084126258Smlaier#endif /* INET6 */ 1085126258Smlaier } 1086126258Smlaier} 1087126258Smlaier 1088126258Smlaiervoid 1089126258Smlaierpf_send_tcp(const struct pf_rule *r, sa_family_t af, 1090126258Smlaier const struct pf_addr *saddr, const struct pf_addr *daddr, 1091126258Smlaier u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1092126258Smlaier u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl) 1093126258Smlaier{ 1094126258Smlaier struct mbuf *m; 1095126258Smlaier struct m_tag *mtag; 1096126258Smlaier int len, tlen; 1097126258Smlaier#ifdef INET 1098126258Smlaier struct ip *h; 1099126258Smlaier#endif /* INET */ 1100126258Smlaier#ifdef INET6 1101126258Smlaier struct ip6_hdr *h6; 1102126258Smlaier#endif /* INET6 */ 1103126258Smlaier struct tcphdr *th; 1104126258Smlaier char *opt; 1105126258Smlaier 1106126258Smlaier /* maximum segment size tcp option */ 1107126258Smlaier tlen = sizeof(struct tcphdr); 1108126258Smlaier if (mss) 1109126258Smlaier tlen += 4; 1110126258Smlaier 1111126258Smlaier switch (af) { 1112126258Smlaier#ifdef INET 1113126258Smlaier case AF_INET: 1114126258Smlaier len = sizeof(struct ip) + tlen; 1115126258Smlaier break; 1116126258Smlaier#endif /* INET */ 1117126258Smlaier#ifdef INET6 1118126258Smlaier case AF_INET6: 1119126258Smlaier len = sizeof(struct ip6_hdr) + tlen; 1120126258Smlaier break; 1121126258Smlaier#endif /* INET6 */ 1122126258Smlaier } 1123126258Smlaier 1124126258Smlaier /* create outgoing mbuf */ 1125126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 1126126258Smlaier if (mtag == NULL) 1127126258Smlaier return; 1128126258Smlaier m = m_gethdr(M_DONTWAIT, MT_HEADER); 1129126258Smlaier if (m == NULL) { 1130126258Smlaier m_tag_free(mtag); 1131126258Smlaier return; 1132126258Smlaier } 1133126258Smlaier m_tag_prepend(m, mtag); 1134126258Smlaier#ifdef ALTQ 1135126258Smlaier if (r != NULL && r->qid) { 1136126258Smlaier struct altq_tag *atag; 1137126258Smlaier 1138126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 1139126258Smlaier if (mtag != NULL) { 1140126258Smlaier atag = (struct altq_tag *)(mtag + 1); 1141126258Smlaier atag->qid = r->qid; 1142126258Smlaier /* add hints for ecn */ 1143126258Smlaier atag->af = af; 1144126258Smlaier atag->hdr = mtod(m, struct ip *); 1145126258Smlaier m_tag_prepend(m, mtag); 1146126258Smlaier } 1147126258Smlaier } 1148126258Smlaier#endif 1149126258Smlaier m->m_data += max_linkhdr; 1150126258Smlaier m->m_pkthdr.len = m->m_len = len; 1151126258Smlaier m->m_pkthdr.rcvif = NULL; 1152126258Smlaier bzero(m->m_data, len); 1153126258Smlaier switch (af) { 1154126258Smlaier#ifdef INET 1155126258Smlaier case AF_INET: 1156126258Smlaier h = mtod(m, struct ip *); 1157126258Smlaier 1158126258Smlaier /* IP header fields included in the TCP checksum */ 1159126258Smlaier h->ip_p = IPPROTO_TCP; 1160126258Smlaier h->ip_len = htons(tlen); 1161126258Smlaier h->ip_src.s_addr = saddr->v4.s_addr; 1162126258Smlaier h->ip_dst.s_addr = daddr->v4.s_addr; 1163126258Smlaier 1164126258Smlaier th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1165126258Smlaier break; 1166126258Smlaier#endif /* INET */ 1167126258Smlaier#ifdef INET6 1168126258Smlaier case AF_INET6: 1169126258Smlaier h6 = mtod(m, struct ip6_hdr *); 1170126258Smlaier 1171126258Smlaier /* IP header fields included in the TCP checksum */ 1172126258Smlaier h6->ip6_nxt = IPPROTO_TCP; 1173126258Smlaier h6->ip6_plen = htons(tlen); 1174126258Smlaier memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1175126258Smlaier memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1176126258Smlaier 1177126258Smlaier th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1178126258Smlaier break; 1179126258Smlaier#endif /* INET6 */ 1180126258Smlaier } 1181126258Smlaier 1182126258Smlaier /* TCP header */ 1183126258Smlaier th->th_sport = sport; 1184126258Smlaier th->th_dport = dport; 1185126258Smlaier th->th_seq = htonl(seq); 1186126258Smlaier th->th_ack = htonl(ack); 1187126258Smlaier th->th_off = tlen >> 2; 1188126258Smlaier th->th_flags = flags; 1189126258Smlaier th->th_win = htons(win); 1190126258Smlaier 1191126258Smlaier if (mss) { 1192126258Smlaier opt = (char *)(th + 1); 1193126258Smlaier opt[0] = TCPOPT_MAXSEG; 1194126258Smlaier opt[1] = 4; 1195126258Smlaier HTONS(mss); 1196126258Smlaier bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1197126258Smlaier } 1198126258Smlaier 1199126258Smlaier switch (af) { 1200126258Smlaier#ifdef INET 1201126258Smlaier case AF_INET: 1202126258Smlaier /* TCP checksum */ 1203126258Smlaier th->th_sum = in_cksum(m, len); 1204126258Smlaier 1205126258Smlaier /* Finish the IP header */ 1206126258Smlaier h->ip_v = 4; 1207126258Smlaier h->ip_hl = sizeof(*h) >> 2; 1208126258Smlaier h->ip_tos = IPTOS_LOWDELAY; 1209126258Smlaier h->ip_len = htons(len); 1210126258Smlaier h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1211126258Smlaier h->ip_ttl = ttl ? ttl : ip_defttl; 1212126258Smlaier h->ip_sum = 0; 1213126258Smlaier ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL, 1214126258Smlaier (void *)NULL); 1215126258Smlaier break; 1216126258Smlaier#endif /* INET */ 1217126258Smlaier#ifdef INET6 1218126258Smlaier case AF_INET6: 1219126258Smlaier /* TCP checksum */ 1220126258Smlaier th->th_sum = in6_cksum(m, IPPROTO_TCP, 1221126258Smlaier sizeof(struct ip6_hdr), tlen); 1222126258Smlaier 1223126258Smlaier h6->ip6_vfc |= IPV6_VERSION; 1224126258Smlaier h6->ip6_hlim = IPV6_DEFHLIM; 1225126258Smlaier 1226126258Smlaier ip6_output(m, NULL, NULL, 0, NULL, NULL); 1227126258Smlaier break; 1228126258Smlaier#endif /* INET6 */ 1229126258Smlaier } 1230126258Smlaier} 1231126258Smlaier 1232126258Smlaiervoid 1233126258Smlaierpf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1234126258Smlaier struct pf_rule *r) 1235126258Smlaier{ 1236126258Smlaier struct m_tag *mtag; 1237126258Smlaier struct mbuf *m0; 1238126258Smlaier 1239126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 1240126258Smlaier if (mtag == NULL) 1241126258Smlaier return; 1242126258Smlaier m0 = m_copy(m, 0, M_COPYALL); 1243126258Smlaier if (m0 == NULL) { 1244126258Smlaier m_tag_free(mtag); 1245126258Smlaier return; 1246126258Smlaier } 1247126258Smlaier m_tag_prepend(m0, mtag); 1248126258Smlaier 1249126258Smlaier#ifdef ALTQ 1250126258Smlaier if (r->qid) { 1251126258Smlaier struct altq_tag *atag; 1252126258Smlaier 1253126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 1254126258Smlaier if (mtag != NULL) { 1255126258Smlaier atag = (struct altq_tag *)(mtag + 1); 1256126258Smlaier atag->qid = r->qid; 1257126258Smlaier /* add hints for ecn */ 1258126258Smlaier atag->af = af; 1259126258Smlaier atag->hdr = mtod(m0, struct ip *); 1260126258Smlaier m_tag_prepend(m0, mtag); 1261126258Smlaier } 1262126258Smlaier } 1263126258Smlaier#endif 1264126258Smlaier 1265126258Smlaier switch (af) { 1266126258Smlaier#ifdef INET 1267126258Smlaier case AF_INET: 1268126258Smlaier icmp_error(m0, type, code, 0, 0); 1269126258Smlaier break; 1270126258Smlaier#endif /* INET */ 1271126258Smlaier#ifdef INET6 1272126258Smlaier case AF_INET6: 1273126258Smlaier icmp6_error(m0, type, code, 0); 1274126258Smlaier break; 1275126258Smlaier#endif /* INET6 */ 1276126258Smlaier } 1277126258Smlaier} 1278126258Smlaier 1279126258Smlaier/* 1280126258Smlaier * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1281126258Smlaier * If n is 0, they match if they are equal. If n is != 0, they match if they 1282126258Smlaier * are different. 1283126258Smlaier */ 1284126258Smlaierint 1285126258Smlaierpf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1286126258Smlaier struct pf_addr *b, sa_family_t af) 1287126258Smlaier{ 1288126258Smlaier int match = 0; 1289126258Smlaier 1290126258Smlaier switch (af) { 1291126258Smlaier#ifdef INET 1292126258Smlaier case AF_INET: 1293126258Smlaier if ((a->addr32[0] & m->addr32[0]) == 1294126258Smlaier (b->addr32[0] & m->addr32[0])) 1295126258Smlaier match++; 1296126258Smlaier break; 1297126258Smlaier#endif /* INET */ 1298126258Smlaier#ifdef INET6 1299126258Smlaier case AF_INET6: 1300126258Smlaier if (((a->addr32[0] & m->addr32[0]) == 1301126258Smlaier (b->addr32[0] & m->addr32[0])) && 1302126258Smlaier ((a->addr32[1] & m->addr32[1]) == 1303126258Smlaier (b->addr32[1] & m->addr32[1])) && 1304126258Smlaier ((a->addr32[2] & m->addr32[2]) == 1305126258Smlaier (b->addr32[2] & m->addr32[2])) && 1306126258Smlaier ((a->addr32[3] & m->addr32[3]) == 1307126258Smlaier (b->addr32[3] & m->addr32[3]))) 1308126258Smlaier match++; 1309126258Smlaier break; 1310126258Smlaier#endif /* INET6 */ 1311126258Smlaier } 1312126258Smlaier if (match) { 1313126258Smlaier if (n) 1314126258Smlaier return (0); 1315126258Smlaier else 1316126258Smlaier return (1); 1317126258Smlaier } else { 1318126258Smlaier if (n) 1319126258Smlaier return (1); 1320126258Smlaier else 1321126258Smlaier return (0); 1322126258Smlaier } 1323126258Smlaier} 1324126258Smlaier 1325126258Smlaierint 1326126258Smlaierpf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1327126258Smlaier{ 1328126258Smlaier switch (op) { 1329126258Smlaier case PF_OP_IRG: 1330126258Smlaier return ((p > a1) && (p < a2)); 1331126258Smlaier case PF_OP_XRG: 1332126258Smlaier return ((p < a1) || (p > a2)); 1333126258Smlaier case PF_OP_RRG: 1334126258Smlaier return ((p >= a1) && (p <= a2)); 1335126258Smlaier case PF_OP_EQ: 1336126258Smlaier return (p == a1); 1337126258Smlaier case PF_OP_NE: 1338126258Smlaier return (p != a1); 1339126258Smlaier case PF_OP_LT: 1340126258Smlaier return (p < a1); 1341126258Smlaier case PF_OP_LE: 1342126258Smlaier return (p <= a1); 1343126258Smlaier case PF_OP_GT: 1344126258Smlaier return (p > a1); 1345126258Smlaier case PF_OP_GE: 1346126258Smlaier return (p >= a1); 1347126258Smlaier } 1348126258Smlaier return (0); /* never reached */ 1349126258Smlaier} 1350126258Smlaier 1351126258Smlaierint 1352126258Smlaierpf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1353126258Smlaier{ 1354126258Smlaier NTOHS(a1); 1355126258Smlaier NTOHS(a2); 1356126258Smlaier NTOHS(p); 1357126258Smlaier return (pf_match(op, a1, a2, p)); 1358126258Smlaier} 1359126258Smlaier 1360126258Smlaierint 1361126258Smlaierpf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1362126258Smlaier{ 1363126258Smlaier if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1364126258Smlaier return (0); 1365126258Smlaier return (pf_match(op, a1, a2, u)); 1366126258Smlaier} 1367126258Smlaier 1368126258Smlaierint 1369126258Smlaierpf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 1370126258Smlaier{ 1371126258Smlaier if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1372126258Smlaier return (0); 1373126258Smlaier return (pf_match(op, a1, a2, g)); 1374126258Smlaier} 1375126258Smlaier 1376126258Smlaierstruct pf_tag * 1377126258Smlaierpf_get_tag(struct mbuf *m) 1378126258Smlaier{ 1379126258Smlaier struct m_tag *mtag; 1380126258Smlaier 1381126258Smlaier if ((mtag = m_tag_find(m, PACKET_TAG_PF_TAG, NULL)) != NULL) 1382126258Smlaier return ((struct pf_tag *)(mtag + 1)); 1383126258Smlaier else 1384126258Smlaier return (NULL); 1385126258Smlaier} 1386126258Smlaier 1387126258Smlaierint 1388126258Smlaierpf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_rule *nat, 1389126258Smlaier struct pf_rule *rdr, struct pf_tag *pftag, int *tag) 1390126258Smlaier{ 1391126258Smlaier if (*tag == -1) { /* find mbuf tag */ 1392126258Smlaier pftag = pf_get_tag(m); 1393126258Smlaier if (pftag != NULL) 1394126258Smlaier *tag = pftag->tag; 1395126258Smlaier else 1396126258Smlaier *tag = 0; 1397126258Smlaier if (nat != NULL && nat->tag) 1398126258Smlaier *tag = nat->tag; 1399126258Smlaier if (rdr != NULL && rdr->tag) 1400126258Smlaier *tag = rdr->tag; 1401126258Smlaier } 1402126258Smlaier 1403126258Smlaier return ((!r->match_tag_not && r->match_tag == *tag) || 1404126258Smlaier (r->match_tag_not && r->match_tag != *tag)); 1405126258Smlaier} 1406126258Smlaier 1407126258Smlaierint 1408126258Smlaierpf_tag_packet(struct mbuf *m, struct pf_tag *pftag, int tag) 1409126258Smlaier{ 1410126258Smlaier struct m_tag *mtag; 1411126258Smlaier 1412126258Smlaier if (tag <= 0) 1413126258Smlaier return (0); 1414126258Smlaier 1415126258Smlaier if (pftag == NULL) { 1416126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_TAG, sizeof(*pftag), M_NOWAIT); 1417126258Smlaier if (mtag == NULL) 1418126258Smlaier return (1); 1419126258Smlaier ((struct pf_tag *)(mtag + 1))->tag = tag; 1420126258Smlaier m_tag_prepend(m, mtag); 1421126258Smlaier } else 1422126258Smlaier pftag->tag = tag; 1423126258Smlaier 1424126258Smlaier return (0); 1425126258Smlaier} 1426126258Smlaier 1427126258Smlaier#define PF_STEP_INTO_ANCHOR(r, a, s, n) \ 1428126258Smlaier do { \ 1429126258Smlaier if ((r) == NULL || (r)->anchor == NULL || \ 1430126258Smlaier (s) != NULL || (a) != NULL) \ 1431126258Smlaier panic("PF_STEP_INTO_ANCHOR"); \ 1432126258Smlaier (a) = (r); \ 1433126258Smlaier (s) = TAILQ_FIRST(&(r)->anchor->rulesets); \ 1434126258Smlaier (r) = NULL; \ 1435126258Smlaier while ((s) != NULL && ((r) = \ 1436126258Smlaier TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \ 1437126258Smlaier (s) = TAILQ_NEXT((s), entries); \ 1438126258Smlaier if ((r) == NULL) { \ 1439126258Smlaier (r) = TAILQ_NEXT((a), entries); \ 1440126258Smlaier (a) = NULL; \ 1441126258Smlaier } \ 1442126258Smlaier } while (0) 1443126258Smlaier 1444126258Smlaier#define PF_STEP_OUT_OF_ANCHOR(r, a, s, n) \ 1445126258Smlaier do { \ 1446126258Smlaier if ((r) != NULL || (a) == NULL || (s) == NULL) \ 1447126258Smlaier panic("PF_STEP_OUT_OF_ANCHOR"); \ 1448126258Smlaier (s) = TAILQ_NEXT((s), entries); \ 1449126258Smlaier while ((s) != NULL && ((r) = \ 1450126258Smlaier TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \ 1451126258Smlaier (s) = TAILQ_NEXT((s), entries); \ 1452126258Smlaier if ((r) == NULL) { \ 1453126258Smlaier (r) = TAILQ_NEXT((a), entries); \ 1454126258Smlaier (a) = NULL; \ 1455126258Smlaier } \ 1456126258Smlaier } while (0) 1457126258Smlaier 1458126258Smlaier#ifdef INET6 1459126258Smlaiervoid 1460126258Smlaierpf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 1461126258Smlaier struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 1462126258Smlaier{ 1463126258Smlaier switch (af) { 1464126258Smlaier#ifdef INET 1465126258Smlaier case AF_INET: 1466126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 1467126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 1468126258Smlaier break; 1469126258Smlaier#endif /* INET */ 1470126258Smlaier case AF_INET6: 1471126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 1472126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 1473126258Smlaier naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 1474126258Smlaier ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 1475126258Smlaier naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 1476126258Smlaier ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 1477126258Smlaier naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 1478126258Smlaier ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 1479126258Smlaier break; 1480126258Smlaier } 1481126258Smlaier} 1482126258Smlaier 1483126258Smlaiervoid 1484126258Smlaierpf_addr_inc(struct pf_addr *addr, u_int8_t af) 1485126258Smlaier{ 1486126258Smlaier switch (af) { 1487126258Smlaier#ifdef INET 1488126258Smlaier case AF_INET: 1489126258Smlaier addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 1490126258Smlaier break; 1491126258Smlaier#endif /* INET */ 1492126258Smlaier case AF_INET6: 1493126258Smlaier if (addr->addr32[3] == 0xffffffff) { 1494126258Smlaier addr->addr32[3] = 0; 1495126258Smlaier if (addr->addr32[2] == 0xffffffff) { 1496126258Smlaier addr->addr32[2] = 0; 1497126258Smlaier if (addr->addr32[1] == 0xffffffff) { 1498126258Smlaier addr->addr32[1] = 0; 1499126258Smlaier addr->addr32[0] = 1500126258Smlaier htonl(ntohl(addr->addr32[0]) + 1); 1501126258Smlaier } else 1502126258Smlaier addr->addr32[1] = 1503126258Smlaier htonl(ntohl(addr->addr32[1]) + 1); 1504126258Smlaier } else 1505126258Smlaier addr->addr32[2] = 1506126258Smlaier htonl(ntohl(addr->addr32[2]) + 1); 1507126258Smlaier } else 1508126258Smlaier addr->addr32[3] = 1509126258Smlaier htonl(ntohl(addr->addr32[3]) + 1); 1510126258Smlaier break; 1511126258Smlaier } 1512126258Smlaier} 1513126258Smlaier#endif /* INET6 */ 1514126258Smlaier 1515126258Smlaier#define mix(a,b,c) \ 1516126258Smlaier do { \ 1517126258Smlaier a -= b; a -= c; a ^= (c >> 13); \ 1518126258Smlaier b -= c; b -= a; b ^= (a << 8); \ 1519126258Smlaier c -= a; c -= b; c ^= (b >> 13); \ 1520126258Smlaier a -= b; a -= c; a ^= (c >> 12); \ 1521126258Smlaier b -= c; b -= a; b ^= (a << 16); \ 1522126258Smlaier c -= a; c -= b; c ^= (b >> 5); \ 1523126258Smlaier a -= b; a -= c; a ^= (c >> 3); \ 1524126258Smlaier b -= c; b -= a; b ^= (a << 10); \ 1525126258Smlaier c -= a; c -= b; c ^= (b >> 15); \ 1526126258Smlaier } while (0) 1527126258Smlaier 1528126258Smlaier/* 1529126258Smlaier * hash function based on bridge_hash in if_bridge.c 1530126258Smlaier */ 1531126258Smlaiervoid 1532126258Smlaierpf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 1533126258Smlaier struct pf_poolhashkey *key, sa_family_t af) 1534126258Smlaier{ 1535126258Smlaier u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 1536126258Smlaier 1537126258Smlaier switch (af) { 1538126258Smlaier#ifdef INET 1539126258Smlaier case AF_INET: 1540126258Smlaier a += inaddr->addr32[0]; 1541126258Smlaier b += key->key32[1]; 1542126258Smlaier mix(a, b, c); 1543126258Smlaier hash->addr32[0] = c + key->key32[2]; 1544126258Smlaier break; 1545126258Smlaier#endif /* INET */ 1546126258Smlaier#ifdef INET6 1547126258Smlaier case AF_INET6: 1548126258Smlaier a += inaddr->addr32[0]; 1549126258Smlaier b += inaddr->addr32[2]; 1550126258Smlaier mix(a, b, c); 1551126258Smlaier hash->addr32[0] = c; 1552126258Smlaier a += inaddr->addr32[1]; 1553126258Smlaier b += inaddr->addr32[3]; 1554126258Smlaier c += key->key32[1]; 1555126258Smlaier mix(a, b, c); 1556126258Smlaier hash->addr32[1] = c; 1557126258Smlaier a += inaddr->addr32[2]; 1558126258Smlaier b += inaddr->addr32[1]; 1559126258Smlaier c += key->key32[2]; 1560126258Smlaier mix(a, b, c); 1561126258Smlaier hash->addr32[2] = c; 1562126258Smlaier a += inaddr->addr32[3]; 1563126258Smlaier b += inaddr->addr32[0]; 1564126258Smlaier c += key->key32[3]; 1565126258Smlaier mix(a, b, c); 1566126258Smlaier hash->addr32[3] = c; 1567126258Smlaier break; 1568126258Smlaier#endif /* INET6 */ 1569126258Smlaier } 1570126258Smlaier} 1571126258Smlaier 1572126258Smlaierint 1573126258Smlaierpf_map_addr(u_int8_t af, struct pf_pool *rpool, struct pf_addr *saddr, 1574126258Smlaier struct pf_addr *naddr, struct pf_addr *init_addr) 1575126258Smlaier{ 1576126258Smlaier unsigned char hash[16]; 1577126258Smlaier struct pf_addr *raddr; 1578126258Smlaier struct pf_addr *rmask; 1579126258Smlaier struct pf_pooladdr *acur = rpool->cur; 1580126258Smlaier 1581126258Smlaier if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 1582126258Smlaier return (1); 1583126258Smlaier if (rpool->cur->addr.type == PF_ADDR_DYNIFTL && 1584126258Smlaier rpool->cur->addr.p.dyn->undefined) 1585126258Smlaier return (1); 1586126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 1587126258Smlaier if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 1588126258Smlaier return (1); /* unsupported */ 1589126258Smlaier } else { 1590126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 1591126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 1592126258Smlaier } 1593126258Smlaier 1594126258Smlaier switch (rpool->opts & PF_POOL_TYPEMASK) { 1595126258Smlaier case PF_POOL_NONE: 1596126258Smlaier PF_ACPY(naddr, raddr, af); 1597126258Smlaier break; 1598126258Smlaier case PF_POOL_BITMASK: 1599126258Smlaier PF_POOLMASK(naddr, raddr, rmask, saddr, af); 1600126258Smlaier break; 1601126258Smlaier case PF_POOL_RANDOM: 1602126258Smlaier if (init_addr != NULL && PF_AZERO(init_addr, af)) { 1603126258Smlaier switch (af) { 1604126258Smlaier#ifdef INET 1605126258Smlaier case AF_INET: 1606126258Smlaier rpool->counter.addr32[0] = arc4random(); 1607126258Smlaier break; 1608126258Smlaier#endif /* INET */ 1609126258Smlaier#ifdef INET6 1610126258Smlaier case AF_INET6: 1611126258Smlaier if (rmask->addr32[3] != 0xffffffff) 1612126258Smlaier rpool->counter.addr32[3] = arc4random(); 1613126258Smlaier else 1614126258Smlaier break; 1615126258Smlaier if (rmask->addr32[2] != 0xffffffff) 1616126258Smlaier rpool->counter.addr32[2] = arc4random(); 1617126258Smlaier else 1618126258Smlaier break; 1619126258Smlaier if (rmask->addr32[1] != 0xffffffff) 1620126258Smlaier rpool->counter.addr32[1] = arc4random(); 1621126258Smlaier else 1622126258Smlaier break; 1623126258Smlaier if (rmask->addr32[0] != 0xffffffff) 1624126258Smlaier rpool->counter.addr32[0] = arc4random(); 1625126258Smlaier break; 1626126258Smlaier#endif /* INET6 */ 1627126258Smlaier } 1628126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 1629126258Smlaier PF_ACPY(init_addr, naddr, af); 1630126258Smlaier 1631126258Smlaier } else { 1632126258Smlaier PF_AINC(&rpool->counter, af); 1633126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 1634126258Smlaier } 1635126258Smlaier break; 1636126258Smlaier case PF_POOL_SRCHASH: 1637126258Smlaier pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 1638126258Smlaier PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 1639126258Smlaier break; 1640126258Smlaier case PF_POOL_ROUNDROBIN: 1641126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 1642126258Smlaier if (!pfr_pool_get(rpool->cur->addr.p.tbl, 1643126258Smlaier &rpool->tblidx, &rpool->counter, 1644126258Smlaier &raddr, &rmask, af)) 1645126258Smlaier goto get_addr; 1646126258Smlaier } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 1647126258Smlaier goto get_addr; 1648126258Smlaier 1649126258Smlaier try_next: 1650126258Smlaier if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 1651126258Smlaier rpool->cur = TAILQ_FIRST(&rpool->list); 1652126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 1653126258Smlaier rpool->tblidx = -1; 1654126258Smlaier if (pfr_pool_get(rpool->cur->addr.p.tbl, 1655126258Smlaier &rpool->tblidx, &rpool->counter, 1656126258Smlaier &raddr, &rmask, af)) { 1657126258Smlaier /* table contain no address of type 'af' */ 1658126258Smlaier if (rpool->cur != acur) 1659126258Smlaier goto try_next; 1660126258Smlaier return (1); 1661126258Smlaier } 1662126258Smlaier } else { 1663126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 1664126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 1665126258Smlaier PF_ACPY(&rpool->counter, raddr, af); 1666126258Smlaier } 1667126258Smlaier 1668126258Smlaier get_addr: 1669126258Smlaier PF_ACPY(naddr, &rpool->counter, af); 1670126258Smlaier PF_AINC(&rpool->counter, af); 1671126258Smlaier break; 1672126258Smlaier } 1673126258Smlaier 1674126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC && 1675126258Smlaier (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 1676126258Smlaier printf("pf_map_addr: selected address: "); 1677126258Smlaier pf_print_host(naddr, 0, af); 1678126258Smlaier printf("\n"); 1679126258Smlaier } 1680126258Smlaier 1681126258Smlaier return (0); 1682126258Smlaier} 1683126258Smlaier 1684126258Smlaierint 1685126258Smlaierpf_get_sport(sa_family_t af, u_int8_t proto, struct pf_pool *rpool, 1686126258Smlaier struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 1687126258Smlaier struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high) 1688126258Smlaier{ 1689126258Smlaier struct pf_tree_node key; 1690126258Smlaier struct pf_addr init_addr; 1691126258Smlaier u_int16_t cut; 1692126258Smlaier 1693126258Smlaier bzero(&init_addr, sizeof(init_addr)); 1694126258Smlaier if (pf_map_addr(af, rpool, saddr, naddr, &init_addr)) 1695126258Smlaier return (1); 1696126258Smlaier 1697126258Smlaier do { 1698126258Smlaier key.af = af; 1699126258Smlaier key.proto = proto; 1700126258Smlaier PF_ACPY(&key.addr[0], daddr, key.af); 1701126258Smlaier PF_ACPY(&key.addr[1], naddr, key.af); 1702126258Smlaier key.port[0] = dport; 1703126258Smlaier 1704126258Smlaier /* 1705126258Smlaier * port search; start random, step; 1706126258Smlaier * similar 2 portloop in in_pcbbind 1707126258Smlaier */ 1708126258Smlaier if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) { 1709126258Smlaier key.port[1] = 0; 1710126258Smlaier if (pf_find_state(&tree_ext_gwy, &key) == NULL) 1711126258Smlaier return (0); 1712126258Smlaier } else if (low == 0 && high == 0) { 1713126258Smlaier key.port[1] = *nport; 1714126258Smlaier if (pf_find_state(&tree_ext_gwy, &key) == NULL) { 1715126258Smlaier return (0); 1716126258Smlaier } 1717126258Smlaier } else if (low == high) { 1718126258Smlaier key.port[1] = htons(low); 1719126258Smlaier if (pf_find_state(&tree_ext_gwy, &key) == NULL) { 1720126258Smlaier *nport = htons(low); 1721126258Smlaier return (0); 1722126258Smlaier } 1723126258Smlaier } else { 1724126258Smlaier u_int16_t tmp; 1725126258Smlaier 1726126258Smlaier if (low > high) { 1727126258Smlaier tmp = low; 1728126258Smlaier low = high; 1729126258Smlaier high = tmp; 1730126258Smlaier } 1731126258Smlaier /* low < high */ 1732126258Smlaier cut = arc4random() % (1 + high - low) + low; 1733126258Smlaier /* low <= cut <= high */ 1734126258Smlaier for (tmp = cut; tmp <= high; ++(tmp)) { 1735126258Smlaier key.port[1] = htons(tmp); 1736126258Smlaier if (pf_find_state(&tree_ext_gwy, &key) == 1737126258Smlaier NULL) { 1738126258Smlaier *nport = htons(tmp); 1739126258Smlaier return (0); 1740126258Smlaier } 1741126258Smlaier } 1742126258Smlaier for (tmp = cut - 1; tmp >= low; --(tmp)) { 1743126258Smlaier key.port[1] = htons(tmp); 1744126258Smlaier if (pf_find_state(&tree_ext_gwy, &key) == 1745126258Smlaier NULL) { 1746126258Smlaier *nport = htons(tmp); 1747126258Smlaier return (0); 1748126258Smlaier } 1749126258Smlaier } 1750126258Smlaier } 1751126258Smlaier 1752126258Smlaier switch (rpool->opts & PF_POOL_TYPEMASK) { 1753126258Smlaier case PF_POOL_RANDOM: 1754126258Smlaier case PF_POOL_ROUNDROBIN: 1755126258Smlaier if (pf_map_addr(af, rpool, saddr, naddr, &init_addr)) 1756126258Smlaier return (1); 1757126258Smlaier break; 1758126258Smlaier case PF_POOL_NONE: 1759126258Smlaier case PF_POOL_SRCHASH: 1760126258Smlaier case PF_POOL_BITMASK: 1761126258Smlaier default: 1762126258Smlaier return (1); 1763126258Smlaier break; 1764126258Smlaier } 1765126258Smlaier } while (! PF_AEQ(&init_addr, naddr, af) ); 1766126258Smlaier 1767126258Smlaier return (1); /* none available */ 1768126258Smlaier} 1769126258Smlaier 1770126258Smlaierstruct pf_rule * 1771126258Smlaierpf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 1772126258Smlaier int direction, struct ifnet *ifp, struct pf_addr *saddr, u_int16_t sport, 1773126258Smlaier struct pf_addr *daddr, u_int16_t dport, int rs_num) 1774126258Smlaier{ 1775126258Smlaier struct pf_rule *r, *rm = NULL, *anchorrule = NULL; 1776126258Smlaier struct pf_ruleset *ruleset = NULL; 1777126258Smlaier 1778126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 1779126258Smlaier while (r && rm == NULL) { 1780126258Smlaier struct pf_rule_addr *src = NULL, *dst = NULL; 1781126258Smlaier struct pf_addr_wrap *xdst = NULL; 1782126258Smlaier 1783126258Smlaier if (r->action == PF_BINAT && direction == PF_IN) { 1784126258Smlaier src = &r->dst; 1785126258Smlaier if (r->rpool.cur != NULL) 1786126258Smlaier xdst = &r->rpool.cur->addr; 1787126258Smlaier } else { 1788126258Smlaier src = &r->src; 1789126258Smlaier dst = &r->dst; 1790126258Smlaier } 1791126258Smlaier 1792126258Smlaier r->evaluations++; 1793126258Smlaier if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) || 1794126258Smlaier (r->ifp == ifp && r->ifnot))) 1795126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 1796126258Smlaier else if (r->direction && r->direction != direction) 1797126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 1798126258Smlaier else if (r->af && r->af != pd->af) 1799126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 1800126258Smlaier else if (r->proto && r->proto != pd->proto) 1801126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 1802126258Smlaier else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->not)) 1803126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 1804126258Smlaier PF_SKIP_DST_ADDR].ptr; 1805126258Smlaier else if (src->port_op && !pf_match_port(src->port_op, 1806126258Smlaier src->port[0], src->port[1], sport)) 1807126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 1808126258Smlaier PF_SKIP_DST_PORT].ptr; 1809126258Smlaier else if (dst != NULL && 1810126258Smlaier PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->not)) 1811126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 1812126258Smlaier else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0)) 1813126258Smlaier r = TAILQ_NEXT(r, entries); 1814126258Smlaier else if (dst != NULL && dst->port_op && 1815126258Smlaier !pf_match_port(dst->port_op, dst->port[0], 1816126258Smlaier dst->port[1], dport)) 1817126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 1818126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 1819126258Smlaier IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 1820126258Smlaier off, pd->hdr.tcp), r->os_fingerprint))) 1821126258Smlaier r = TAILQ_NEXT(r, entries); 1822126258Smlaier else if (r->anchorname[0] && r->anchor == NULL) 1823126258Smlaier r = TAILQ_NEXT(r, entries); 1824126258Smlaier else if (r->anchor == NULL) 1825126258Smlaier rm = r; 1826126258Smlaier else 1827126258Smlaier PF_STEP_INTO_ANCHOR(r, anchorrule, ruleset, rs_num); 1828126258Smlaier if (r == NULL && anchorrule != NULL) 1829126258Smlaier PF_STEP_OUT_OF_ANCHOR(r, anchorrule, ruleset, 1830126258Smlaier rs_num); 1831126258Smlaier } 1832126258Smlaier if (rm != NULL && (rm->action == PF_NONAT || 1833126258Smlaier rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 1834126258Smlaier return (NULL); 1835126258Smlaier return (rm); 1836126258Smlaier} 1837126258Smlaier 1838126258Smlaierstruct pf_rule * 1839126258Smlaierpf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 1840126258Smlaier struct ifnet *ifp, 1841126258Smlaier struct pf_addr *saddr, u_int16_t sport, 1842126258Smlaier struct pf_addr *daddr, u_int16_t dport, 1843126258Smlaier struct pf_addr *naddr, u_int16_t *nport) 1844126258Smlaier{ 1845126258Smlaier struct pf_rule *r = NULL; 1846126258Smlaier 1847126258Smlaier if (direction == PF_OUT) { 1848126258Smlaier r = pf_match_translation(pd, m, off, direction, ifp, saddr, 1849126258Smlaier sport, daddr, dport, PF_RULESET_BINAT); 1850126258Smlaier if (r == NULL) 1851126258Smlaier r = pf_match_translation(pd, m, off, direction, ifp, 1852126258Smlaier saddr, sport, daddr, dport, PF_RULESET_NAT); 1853126258Smlaier } else { 1854126258Smlaier r = pf_match_translation(pd, m, off, direction, ifp, saddr, 1855126258Smlaier sport, daddr, dport, PF_RULESET_RDR); 1856126258Smlaier if (r == NULL) 1857126258Smlaier r = pf_match_translation(pd, m, off, direction, ifp, 1858126258Smlaier saddr, sport, daddr, dport, PF_RULESET_BINAT); 1859126258Smlaier } 1860126258Smlaier 1861126258Smlaier if (r != NULL) { 1862126258Smlaier switch (r->action) { 1863126258Smlaier case PF_NONAT: 1864126258Smlaier case PF_NOBINAT: 1865126258Smlaier case PF_NORDR: 1866126258Smlaier return (NULL); 1867126258Smlaier break; 1868126258Smlaier case PF_NAT: 1869126258Smlaier if (pf_get_sport(pd->af, pd->proto, &r->rpool, saddr, 1870126258Smlaier daddr, dport, naddr, nport, r->rpool.proxy_port[0], 1871126258Smlaier r->rpool.proxy_port[1])) { 1872126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 1873126258Smlaier ("pf: NAT proxy port allocation " 1874126258Smlaier "(%u-%u) failed\n", 1875126258Smlaier r->rpool.proxy_port[0], 1876126258Smlaier r->rpool.proxy_port[1])); 1877126258Smlaier return (NULL); 1878126258Smlaier } 1879126258Smlaier break; 1880126258Smlaier case PF_BINAT: 1881126258Smlaier switch (direction) { 1882126258Smlaier case PF_OUT: 1883126258Smlaier if (r->rpool.cur->addr.type == 1884126258Smlaier PF_ADDR_DYNIFTL && 1885126258Smlaier r->rpool.cur->addr.p.dyn->undefined) 1886126258Smlaier return (NULL); 1887126258Smlaier else 1888126258Smlaier PF_POOLMASK(naddr, 1889126258Smlaier &r->rpool.cur->addr.v.a.addr, 1890126258Smlaier &r->rpool.cur->addr.v.a.mask, 1891126258Smlaier saddr, pd->af); 1892126258Smlaier break; 1893126258Smlaier case PF_IN: 1894126258Smlaier if (r->src.addr.type == PF_ADDR_DYNIFTL && 1895126258Smlaier r->src.addr.p.dyn->undefined) 1896126258Smlaier return (NULL); 1897126258Smlaier else 1898126258Smlaier PF_POOLMASK(naddr, 1899126258Smlaier &r->src.addr.v.a.addr, 1900126258Smlaier &r->src.addr.v.a.mask, saddr, 1901126258Smlaier pd->af); 1902126258Smlaier break; 1903126258Smlaier } 1904126258Smlaier break; 1905126258Smlaier case PF_RDR: { 1906126258Smlaier if (pf_map_addr(r->af, &r->rpool, saddr, naddr, NULL)) 1907126258Smlaier return (NULL); 1908126258Smlaier 1909126258Smlaier if (r->rpool.proxy_port[1]) { 1910126258Smlaier u_int32_t tmp_nport; 1911126258Smlaier 1912126258Smlaier tmp_nport = ((ntohs(dport) - 1913126258Smlaier ntohs(r->dst.port[0])) % 1914126258Smlaier (r->rpool.proxy_port[1] - 1915126258Smlaier r->rpool.proxy_port[0] + 1)) + 1916126258Smlaier r->rpool.proxy_port[0]; 1917126258Smlaier 1918126258Smlaier /* wrap around if necessary */ 1919126258Smlaier if (tmp_nport > 65535) 1920126258Smlaier tmp_nport -= 65535; 1921126258Smlaier *nport = htons((u_int16_t)tmp_nport); 1922126258Smlaier } else if (r->rpool.proxy_port[0]) 1923126258Smlaier *nport = htons(r->rpool.proxy_port[0]); 1924126258Smlaier break; 1925126258Smlaier } 1926126258Smlaier default: 1927126258Smlaier return (NULL); 1928126258Smlaier break; 1929126258Smlaier } 1930126258Smlaier } 1931126258Smlaier 1932126258Smlaier return (r); 1933126258Smlaier} 1934126258Smlaier 1935126258Smlaierint 1936126258Smlaierpf_socket_lookup(uid_t *uid, gid_t *gid, int direction, sa_family_t af, 1937126258Smlaier int proto, struct pf_pdesc *pd) 1938126258Smlaier{ 1939126258Smlaier struct pf_addr *saddr, *daddr; 1940126258Smlaier u_int16_t sport, dport; 1941126258Smlaier struct inpcbtable *tb; 1942126258Smlaier struct inpcb *inp; 1943126258Smlaier 1944126258Smlaier *uid = UID_MAX; 1945126258Smlaier *gid = GID_MAX; 1946126258Smlaier switch (proto) { 1947126258Smlaier case IPPROTO_TCP: 1948126258Smlaier sport = pd->hdr.tcp->th_sport; 1949126258Smlaier dport = pd->hdr.tcp->th_dport; 1950126258Smlaier tb = &tcbtable; 1951126258Smlaier break; 1952126258Smlaier case IPPROTO_UDP: 1953126258Smlaier sport = pd->hdr.udp->uh_sport; 1954126258Smlaier dport = pd->hdr.udp->uh_dport; 1955126258Smlaier tb = &udbtable; 1956126258Smlaier break; 1957126258Smlaier default: 1958126258Smlaier return (0); 1959126258Smlaier } 1960126258Smlaier if (direction == PF_IN) { 1961126258Smlaier saddr = pd->src; 1962126258Smlaier daddr = pd->dst; 1963126258Smlaier } else { 1964126258Smlaier u_int16_t p; 1965126258Smlaier 1966126258Smlaier p = sport; 1967126258Smlaier sport = dport; 1968126258Smlaier dport = p; 1969126258Smlaier saddr = pd->dst; 1970126258Smlaier daddr = pd->src; 1971126258Smlaier } 1972126258Smlaier switch(af) { 1973126258Smlaier case AF_INET: 1974126258Smlaier inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 1975126258Smlaier if (inp == NULL) { 1976126258Smlaier inp = in_pcblookup(tb, &saddr->v4, sport, &daddr->v4, 1977126258Smlaier dport, INPLOOKUP_WILDCARD); 1978126258Smlaier if (inp == NULL) 1979126258Smlaier return (0); 1980126258Smlaier } 1981126258Smlaier break; 1982126258Smlaier#ifdef INET6 1983126258Smlaier case AF_INET6: 1984126258Smlaier inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 1985126258Smlaier dport); 1986126258Smlaier if (inp == NULL) { 1987126258Smlaier inp = in_pcblookup(tb, &saddr->v6, sport, &daddr->v6, 1988126258Smlaier dport, INPLOOKUP_WILDCARD | INPLOOKUP_IPV6); 1989126258Smlaier if (inp == NULL) 1990126258Smlaier return (0); 1991126258Smlaier } 1992126258Smlaier break; 1993126258Smlaier#endif /* INET6 */ 1994126258Smlaier 1995126258Smlaier default: 1996126258Smlaier return (0); 1997126258Smlaier } 1998126258Smlaier *uid = inp->inp_socket->so_euid; 1999126258Smlaier *gid = inp->inp_socket->so_egid; 2000126258Smlaier return (1); 2001126258Smlaier} 2002126258Smlaier 2003126258Smlaieru_int8_t 2004126258Smlaierpf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2005126258Smlaier{ 2006126258Smlaier int hlen; 2007126258Smlaier u_int8_t hdr[60]; 2008126258Smlaier u_int8_t *opt, optlen; 2009126258Smlaier u_int8_t wscale = 0; 2010126258Smlaier 2011126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2012126258Smlaier if (hlen <= sizeof(struct tcphdr)) 2013126258Smlaier return (0); 2014126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2015126258Smlaier return (0); 2016126258Smlaier opt = hdr + sizeof(struct tcphdr); 2017126258Smlaier hlen -= sizeof(struct tcphdr); 2018126258Smlaier while (hlen >= 3) { 2019126258Smlaier switch (*opt) { 2020126258Smlaier case TCPOPT_EOL: 2021126258Smlaier case TCPOPT_NOP: 2022126258Smlaier ++opt; 2023126258Smlaier --hlen; 2024126258Smlaier break; 2025126258Smlaier case TCPOPT_WINDOW: 2026126258Smlaier wscale = opt[2]; 2027126258Smlaier if (wscale > TCP_MAX_WINSHIFT) 2028126258Smlaier wscale = TCP_MAX_WINSHIFT; 2029126258Smlaier wscale |= PF_WSCALE_FLAG; 2030126258Smlaier /* fallthrough */ 2031126258Smlaier default: 2032126258Smlaier optlen = opt[1]; 2033126258Smlaier if (optlen < 2) 2034126258Smlaier optlen = 2; 2035126258Smlaier hlen -= optlen; 2036126258Smlaier opt += optlen; 2037126258Smlaier } 2038126258Smlaier } 2039126258Smlaier return (wscale); 2040126258Smlaier} 2041126258Smlaier 2042126258Smlaieru_int16_t 2043126258Smlaierpf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2044126258Smlaier{ 2045126258Smlaier int hlen; 2046126258Smlaier u_int8_t hdr[60]; 2047126258Smlaier u_int8_t *opt, optlen; 2048126258Smlaier u_int16_t mss = tcp_mssdflt; 2049126258Smlaier 2050126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2051126258Smlaier if (hlen <= sizeof(struct tcphdr)) 2052126258Smlaier return (0); 2053126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2054126258Smlaier return (0); 2055126258Smlaier opt = hdr + sizeof(struct tcphdr); 2056126258Smlaier hlen -= sizeof(struct tcphdr); 2057126258Smlaier while (hlen >= TCPOLEN_MAXSEG) { 2058126258Smlaier switch (*opt) { 2059126258Smlaier case TCPOPT_EOL: 2060126258Smlaier case TCPOPT_NOP: 2061126258Smlaier ++opt; 2062126258Smlaier --hlen; 2063126258Smlaier break; 2064126258Smlaier case TCPOPT_MAXSEG: 2065126258Smlaier bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2066126258Smlaier /* fallthrough */ 2067126258Smlaier default: 2068126258Smlaier optlen = opt[1]; 2069126258Smlaier if (optlen < 2) 2070126258Smlaier optlen = 2; 2071126258Smlaier hlen -= optlen; 2072126258Smlaier opt += optlen; 2073126258Smlaier } 2074126258Smlaier } 2075126258Smlaier return (mss); 2076126258Smlaier} 2077126258Smlaier 2078126258Smlaieru_int16_t 2079126258Smlaierpf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2080126258Smlaier{ 2081126258Smlaier#ifdef INET 2082126258Smlaier struct sockaddr_in *dst; 2083126258Smlaier struct route ro; 2084126258Smlaier#endif /* INET */ 2085126258Smlaier#ifdef INET6 2086126258Smlaier struct sockaddr_in6 *dst6; 2087126258Smlaier struct route_in6 ro6; 2088126258Smlaier#endif /* INET6 */ 2089126258Smlaier struct rtentry *rt = NULL; 2090126258Smlaier int hlen; 2091126258Smlaier u_int16_t mss = tcp_mssdflt; 2092126258Smlaier 2093126258Smlaier switch (af) { 2094126258Smlaier#ifdef INET 2095126258Smlaier case AF_INET: 2096126258Smlaier hlen = sizeof(struct ip); 2097126258Smlaier bzero(&ro, sizeof(ro)); 2098126258Smlaier dst = (struct sockaddr_in *)&ro.ro_dst; 2099126258Smlaier dst->sin_family = AF_INET; 2100126258Smlaier dst->sin_len = sizeof(*dst); 2101126258Smlaier dst->sin_addr = addr->v4; 2102126258Smlaier rtalloc_noclone(&ro, NO_CLONING); 2103126258Smlaier rt = ro.ro_rt; 2104126258Smlaier break; 2105126258Smlaier#endif /* INET */ 2106126258Smlaier#ifdef INET6 2107126258Smlaier case AF_INET6: 2108126258Smlaier hlen = sizeof(struct ip6_hdr); 2109126258Smlaier bzero(&ro6, sizeof(ro6)); 2110126258Smlaier dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2111126258Smlaier dst6->sin6_family = AF_INET6; 2112126258Smlaier dst6->sin6_len = sizeof(*dst6); 2113126258Smlaier dst6->sin6_addr = addr->v6; 2114126258Smlaier rtalloc_noclone((struct route *)&ro6, NO_CLONING); 2115126258Smlaier rt = ro6.ro_rt; 2116126258Smlaier break; 2117126258Smlaier#endif /* INET6 */ 2118126258Smlaier } 2119126258Smlaier 2120126258Smlaier if (rt && rt->rt_ifp) { 2121126258Smlaier mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2122126258Smlaier mss = max(tcp_mssdflt, mss); 2123126258Smlaier RTFREE(rt); 2124126258Smlaier } 2125126258Smlaier mss = min(mss, offer); 2126126258Smlaier mss = max(mss, 64); /* sanity - at least max opt space */ 2127126258Smlaier return (mss); 2128126258Smlaier} 2129126258Smlaier 2130126258Smlaiervoid 2131126258Smlaierpf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2132126258Smlaier{ 2133126258Smlaier struct pf_rule *r = s->rule.ptr; 2134126258Smlaier 2135126258Smlaier s->rt_ifp = NULL; 2136126258Smlaier if (!r->rt || r->rt == PF_FASTROUTE) 2137126258Smlaier return; 2138126258Smlaier switch (s->af) { 2139126258Smlaier#ifdef INET 2140126258Smlaier case AF_INET: 2141126258Smlaier pf_map_addr(AF_INET, &r->rpool, saddr, 2142126258Smlaier &s->rt_addr, NULL); 2143126258Smlaier s->rt_ifp = r->rpool.cur->ifp; 2144126258Smlaier break; 2145126258Smlaier#endif /* INET */ 2146126258Smlaier#ifdef INET6 2147126258Smlaier case AF_INET6: 2148126258Smlaier pf_map_addr(AF_INET6, &r->rpool, saddr, 2149126258Smlaier &s->rt_addr, NULL); 2150126258Smlaier s->rt_ifp = r->rpool.cur->ifp; 2151126258Smlaier break; 2152126258Smlaier#endif /* INET6 */ 2153126258Smlaier } 2154126258Smlaier} 2155126258Smlaier 2156126258Smlaierint 2157126258Smlaierpf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 2158126258Smlaier struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h, 2159126258Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm) 2160126258Smlaier{ 2161126258Smlaier struct pf_rule *nat = NULL, *rdr = NULL; 2162126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2163126258Smlaier struct pf_addr baddr, naddr; 2164126258Smlaier struct tcphdr *th = pd->hdr.tcp; 2165126258Smlaier u_int16_t bport, nport = 0; 2166126258Smlaier sa_family_t af = pd->af; 2167126258Smlaier int lookup = -1; 2168126258Smlaier uid_t uid; 2169126258Smlaier gid_t gid; 2170126258Smlaier struct pf_rule *r, *a = NULL; 2171126258Smlaier struct pf_ruleset *ruleset = NULL; 2172126258Smlaier u_short reason; 2173126258Smlaier int rewrite = 0; 2174126258Smlaier struct pf_tag *pftag = NULL; 2175126258Smlaier int tag = -1; 2176126258Smlaier u_int16_t mss = tcp_mssdflt; 2177126258Smlaier 2178126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2179126258Smlaier 2180126258Smlaier if (direction == PF_OUT) { 2181126258Smlaier bport = nport = th->th_sport; 2182126258Smlaier /* check outgoing packet for BINAT/NAT */ 2183126258Smlaier if ((nat = pf_get_translation(pd, m, off, PF_OUT, ifp, 2184126258Smlaier saddr, th->th_sport, daddr, th->th_dport, 2185126258Smlaier &naddr, &nport)) != NULL) { 2186126258Smlaier PF_ACPY(&baddr, saddr, af); 2187126258Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 2188126258Smlaier &th->th_sum, &naddr, nport, 0, af); 2189126258Smlaier rewrite++; 2190126258Smlaier if (nat->natpass) 2191126258Smlaier r = NULL; 2192126258Smlaier } 2193126258Smlaier } else { 2194126258Smlaier bport = nport = th->th_dport; 2195126258Smlaier /* check incoming packet for BINAT/RDR */ 2196126258Smlaier if ((rdr = pf_get_translation(pd, m, off, PF_IN, ifp, saddr, 2197126258Smlaier th->th_sport, daddr, th->th_dport, 2198126258Smlaier &naddr, &nport)) != NULL) { 2199126258Smlaier PF_ACPY(&baddr, daddr, af); 2200126258Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 2201126258Smlaier &th->th_sum, &naddr, nport, 0, af); 2202126258Smlaier rewrite++; 2203126258Smlaier if (rdr->natpass) 2204126258Smlaier r = NULL; 2205126258Smlaier } 2206126258Smlaier } 2207126258Smlaier 2208126258Smlaier while (r != NULL) { 2209126258Smlaier r->evaluations++; 2210126258Smlaier if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) || 2211126258Smlaier (r->ifp == ifp && r->ifnot))) 2212126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 2213126258Smlaier else if (r->direction && r->direction != direction) 2214126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 2215126258Smlaier else if (r->af && r->af != af) 2216126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 2217126258Smlaier else if (r->proto && r->proto != IPPROTO_TCP) 2218126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 2219126258Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not)) 2220126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 2221126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 2222126258Smlaier r->src.port[0], r->src.port[1], th->th_sport)) 2223126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 2224126258Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not)) 2225126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 2226126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 2227126258Smlaier r->dst.port[0], r->dst.port[1], th->th_dport)) 2228126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 2229126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 2230126258Smlaier r = TAILQ_NEXT(r, entries); 2231126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 2232126258Smlaier r = TAILQ_NEXT(r, entries); 2233126258Smlaier else if ((r->flagset & th->th_flags) != r->flags) 2234126258Smlaier r = TAILQ_NEXT(r, entries); 2235126258Smlaier else if (r->uid.op && (lookup != -1 || (lookup = 2236126258Smlaier pf_socket_lookup(&uid, &gid, direction, af, IPPROTO_TCP, 2237126258Smlaier pd), 1)) && 2238126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 2239126258Smlaier uid)) 2240126258Smlaier r = TAILQ_NEXT(r, entries); 2241126258Smlaier else if (r->gid.op && (lookup != -1 || (lookup = 2242126258Smlaier pf_socket_lookup(&uid, &gid, direction, af, IPPROTO_TCP, 2243126258Smlaier pd), 1)) && 2244126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 2245126258Smlaier gid)) 2246126258Smlaier r = TAILQ_NEXT(r, entries); 2247126258Smlaier else if (r->match_tag && 2248126258Smlaier !pf_match_tag(m, r, nat, rdr, pftag, &tag)) 2249126258Smlaier r = TAILQ_NEXT(r, entries); 2250126258Smlaier else if (r->anchorname[0] && r->anchor == NULL) 2251126258Smlaier r = TAILQ_NEXT(r, entries); 2252126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 2253126258Smlaier pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 2254126258Smlaier r = TAILQ_NEXT(r, entries); 2255126258Smlaier else { 2256126258Smlaier if (r->tag) 2257126258Smlaier tag = r->tag; 2258126258Smlaier if (r->anchor == NULL) { 2259126258Smlaier *rm = r; 2260126258Smlaier *am = a; 2261126258Smlaier *rsm = ruleset; 2262126258Smlaier if ((*rm)->quick) 2263126258Smlaier break; 2264126258Smlaier r = TAILQ_NEXT(r, entries); 2265126258Smlaier } else 2266126258Smlaier PF_STEP_INTO_ANCHOR(r, a, ruleset, 2267126258Smlaier PF_RULESET_FILTER); 2268126258Smlaier } 2269126258Smlaier if (r == NULL && a != NULL) 2270126258Smlaier PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 2271126258Smlaier PF_RULESET_FILTER); 2272126258Smlaier } 2273126258Smlaier r = *rm; 2274126258Smlaier a = *am; 2275126258Smlaier ruleset = *rsm; 2276126258Smlaier 2277126258Smlaier r->packets++; 2278126258Smlaier r->bytes += pd->tot_len; 2279126258Smlaier if (a != NULL) { 2280126258Smlaier a->packets++; 2281126258Smlaier a->bytes += pd->tot_len; 2282126258Smlaier } 2283126258Smlaier REASON_SET(&reason, PFRES_MATCH); 2284126258Smlaier 2285126258Smlaier if (r->log) { 2286126258Smlaier if (rewrite) 2287126258Smlaier m_copyback(m, off, sizeof(*th), th); 2288126258Smlaier PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset); 2289126258Smlaier } 2290126258Smlaier 2291126258Smlaier if ((r->action == PF_DROP) && 2292126258Smlaier ((r->rule_flag & PFRULE_RETURNRST) || 2293126258Smlaier (r->rule_flag & PFRULE_RETURNICMP) || 2294126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 2295126258Smlaier /* undo NAT changes, if they have taken place */ 2296126258Smlaier if (nat != NULL) { 2297126258Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 2298126258Smlaier &th->th_sum, &baddr, bport, 0, af); 2299126258Smlaier rewrite++; 2300126258Smlaier } else if (rdr != NULL) { 2301126258Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 2302126258Smlaier &th->th_sum, &baddr, bport, 0, af); 2303126258Smlaier rewrite++; 2304126258Smlaier } 2305126258Smlaier if (((r->rule_flag & PFRULE_RETURNRST) || 2306126258Smlaier (r->rule_flag & PFRULE_RETURN)) && 2307126258Smlaier !(th->th_flags & TH_RST)) { 2308126258Smlaier u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 2309126258Smlaier 2310126258Smlaier if (th->th_flags & TH_SYN) 2311126258Smlaier ack++; 2312126258Smlaier if (th->th_flags & TH_FIN) 2313126258Smlaier ack++; 2314126258Smlaier pf_send_tcp(r, af, pd->dst, 2315126258Smlaier pd->src, th->th_dport, th->th_sport, 2316126258Smlaier ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 2317126258Smlaier r->return_ttl); 2318126258Smlaier } else if ((af == AF_INET) && r->return_icmp) 2319126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 2320126258Smlaier r->return_icmp & 255, af, r); 2321126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 2322126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 2323126258Smlaier r->return_icmp6 & 255, af, r); 2324126258Smlaier } 2325126258Smlaier 2326126258Smlaier if (r->action == PF_DROP) 2327126258Smlaier return (PF_DROP); 2328126258Smlaier 2329126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 2330126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2331126258Smlaier return (PF_DROP); 2332126258Smlaier } 2333126258Smlaier 2334126258Smlaier if (r->keep_state || nat != NULL || rdr != NULL || 2335126258Smlaier (pd->flags & PFDESC_TCP_NORM)) { 2336126258Smlaier /* create new state */ 2337126258Smlaier u_int16_t len; 2338126258Smlaier struct pf_state *s = NULL; 2339126258Smlaier 2340126258Smlaier len = pd->tot_len - off - (th->th_off << 2); 2341126258Smlaier if (!r->max_states || r->states < r->max_states) 2342126258Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 2343126258Smlaier if (s == NULL) { 2344126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2345126258Smlaier return (PF_DROP); 2346126258Smlaier } 2347126258Smlaier bzero(s, sizeof(*s)); 2348126258Smlaier r->states++; 2349126258Smlaier if (a != NULL) 2350126258Smlaier a->states++; 2351126258Smlaier s->rule.ptr = r; 2352126258Smlaier if (nat != NULL) 2353126258Smlaier s->nat_rule.ptr = nat; 2354126258Smlaier else 2355126258Smlaier s->nat_rule.ptr = rdr; 2356126258Smlaier if (s->nat_rule.ptr != NULL) 2357126258Smlaier s->nat_rule.ptr->states++; 2358126258Smlaier s->anchor.ptr = a; 2359126258Smlaier s->allow_opts = r->allow_opts; 2360126258Smlaier s->log = r->log & 2; 2361126258Smlaier s->proto = IPPROTO_TCP; 2362126258Smlaier s->direction = direction; 2363126258Smlaier s->af = af; 2364126258Smlaier if (direction == PF_OUT) { 2365126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 2366126258Smlaier s->gwy.port = th->th_sport; /* sport */ 2367126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 2368126258Smlaier s->ext.port = th->th_dport; 2369126258Smlaier if (nat != NULL) { 2370126258Smlaier PF_ACPY(&s->lan.addr, &baddr, af); 2371126258Smlaier s->lan.port = bport; 2372126258Smlaier } else { 2373126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 2374126258Smlaier s->lan.port = s->gwy.port; 2375126258Smlaier } 2376126258Smlaier } else { 2377126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 2378126258Smlaier s->lan.port = th->th_dport; 2379126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 2380126258Smlaier s->ext.port = th->th_sport; 2381126258Smlaier if (rdr != NULL) { 2382126258Smlaier PF_ACPY(&s->gwy.addr, &baddr, af); 2383126258Smlaier s->gwy.port = bport; 2384126258Smlaier } else { 2385126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 2386126258Smlaier s->gwy.port = s->lan.port; 2387126258Smlaier } 2388126258Smlaier } 2389126258Smlaier 2390126258Smlaier s->src.seqlo = ntohl(th->th_seq); 2391126258Smlaier s->src.seqhi = s->src.seqlo + len + 1; 2392126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 2393126258Smlaier r->keep_state == PF_STATE_MODULATE) { 2394126258Smlaier /* Generate sequence number modulator */ 2395126258Smlaier while ((s->src.seqdiff = arc4random()) == 0) 2396126258Smlaier ; 2397126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, 2398126258Smlaier htonl(s->src.seqlo + s->src.seqdiff), 0); 2399126258Smlaier rewrite = 1; 2400126258Smlaier } else 2401126258Smlaier s->src.seqdiff = 0; 2402126258Smlaier if (th->th_flags & TH_SYN) { 2403126258Smlaier s->src.seqhi++; 2404126258Smlaier s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 2405126258Smlaier } 2406126258Smlaier s->src.max_win = MAX(ntohs(th->th_win), 1); 2407126258Smlaier if (s->src.wscale & PF_WSCALE_MASK) { 2408126258Smlaier /* Remove scale factor from initial window */ 2409126258Smlaier int win = s->src.max_win; 2410126258Smlaier win += 1 << (s->src.wscale & PF_WSCALE_MASK); 2411126258Smlaier s->src.max_win = (win - 1) >> 2412126258Smlaier (s->src.wscale & PF_WSCALE_MASK); 2413126258Smlaier } 2414126258Smlaier if (th->th_flags & TH_FIN) 2415126258Smlaier s->src.seqhi++; 2416126258Smlaier s->dst.seqhi = 1; 2417126258Smlaier s->dst.max_win = 1; 2418126258Smlaier s->src.state = TCPS_SYN_SENT; 2419126258Smlaier s->dst.state = TCPS_CLOSED; 2420126258Smlaier s->creation = time.tv_sec; 2421126258Smlaier s->expire = time.tv_sec; 2422126258Smlaier s->timeout = PFTM_TCP_FIRST_PACKET; 2423126258Smlaier s->packets[0] = 1; 2424126258Smlaier s->bytes[0] = pd->tot_len; 2425126258Smlaier pf_set_rt_ifp(s, saddr); 2426126258Smlaier 2427126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 2428126258Smlaier off, pd, th, &s->src, &s->dst)) { 2429126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2430126258Smlaier pool_put(&pf_state_pl, s); 2431126258Smlaier return (PF_DROP); 2432126258Smlaier } 2433126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 2434126258Smlaier pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src, 2435126258Smlaier &s->dst, &rewrite)) { 2436126258Smlaier pf_normalize_tcp_cleanup(s); 2437126258Smlaier pool_put(&pf_state_pl, s); 2438126258Smlaier return (PF_DROP); 2439126258Smlaier } 2440126258Smlaier if (pf_insert_state(s)) { 2441126258Smlaier pf_normalize_tcp_cleanup(s); 2442126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2443126258Smlaier pool_put(&pf_state_pl, s); 2444126258Smlaier return (PF_DROP); 2445126258Smlaier } else 2446126258Smlaier *sm = s; 2447126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 2448126258Smlaier r->keep_state == PF_STATE_SYNPROXY) { 2449126258Smlaier s->src.state = PF_TCPS_PROXY_SRC; 2450126258Smlaier if (nat != NULL) 2451126258Smlaier pf_change_ap(saddr, &th->th_sport, 2452126258Smlaier pd->ip_sum, &th->th_sum, &baddr, 2453126258Smlaier bport, 0, af); 2454126258Smlaier else if (rdr != NULL) 2455126258Smlaier pf_change_ap(daddr, &th->th_dport, 2456126258Smlaier pd->ip_sum, &th->th_sum, &baddr, 2457126258Smlaier bport, 0, af); 2458126258Smlaier s->src.seqhi = arc4random(); 2459126258Smlaier /* Find mss option */ 2460126258Smlaier mss = pf_get_mss(m, off, th->th_off, af); 2461126258Smlaier mss = pf_calc_mss(saddr, af, mss); 2462126258Smlaier mss = pf_calc_mss(daddr, af, mss); 2463126258Smlaier s->src.mss = mss; 2464126258Smlaier pf_send_tcp(r, af, daddr, saddr, th->th_dport, 2465126258Smlaier th->th_sport, s->src.seqhi, 2466126258Smlaier ntohl(th->th_seq) + 1, TH_SYN|TH_ACK, 0, s->src.mss, 0); 2467126258Smlaier return (PF_SYNPROXY_DROP); 2468126258Smlaier } 2469126258Smlaier } 2470126258Smlaier 2471126258Smlaier /* copy back packet headers if we performed NAT operations */ 2472126258Smlaier if (rewrite) 2473126258Smlaier m_copyback(m, off, sizeof(*th), th); 2474126258Smlaier 2475126258Smlaier return (PF_PASS); 2476126258Smlaier} 2477126258Smlaier 2478126258Smlaierint 2479126258Smlaierpf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 2480126258Smlaier struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h, 2481126258Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm) 2482126258Smlaier{ 2483126258Smlaier struct pf_rule *nat = NULL, *rdr = NULL; 2484126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2485126258Smlaier struct pf_addr baddr, naddr; 2486126258Smlaier struct udphdr *uh = pd->hdr.udp; 2487126258Smlaier u_int16_t bport, nport = 0; 2488126258Smlaier sa_family_t af = pd->af; 2489126258Smlaier int lookup = -1; 2490126258Smlaier uid_t uid; 2491126258Smlaier gid_t gid; 2492126258Smlaier struct pf_rule *r, *a = NULL; 2493126258Smlaier struct pf_ruleset *ruleset = NULL; 2494126258Smlaier u_short reason; 2495126258Smlaier int rewrite = 0; 2496126258Smlaier struct pf_tag *pftag = NULL; 2497126258Smlaier int tag = -1; 2498126258Smlaier 2499126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2500126258Smlaier 2501126258Smlaier if (direction == PF_OUT) { 2502126258Smlaier bport = nport = uh->uh_sport; 2503126258Smlaier /* check outgoing packet for BINAT/NAT */ 2504126258Smlaier if ((nat = pf_get_translation(pd, m, off, PF_OUT, ifp, 2505126258Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, 2506126258Smlaier &naddr, &nport)) != NULL) { 2507126258Smlaier PF_ACPY(&baddr, saddr, af); 2508126258Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 2509126258Smlaier &uh->uh_sum, &naddr, nport, 1, af); 2510126258Smlaier rewrite++; 2511126258Smlaier if (nat->natpass) 2512126258Smlaier r = NULL; 2513126258Smlaier } 2514126258Smlaier } else { 2515126258Smlaier bport = nport = uh->uh_dport; 2516126258Smlaier /* check incoming packet for BINAT/RDR */ 2517126258Smlaier if ((rdr = pf_get_translation(pd, m, off, PF_IN, ifp, saddr, 2518126258Smlaier uh->uh_sport, daddr, uh->uh_dport, &naddr, &nport)) 2519126258Smlaier != NULL) { 2520126258Smlaier PF_ACPY(&baddr, daddr, af); 2521126258Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 2522126258Smlaier &uh->uh_sum, &naddr, nport, 1, af); 2523126258Smlaier rewrite++; 2524126258Smlaier if (rdr->natpass) 2525126258Smlaier r = NULL; 2526126258Smlaier } 2527126258Smlaier } 2528126258Smlaier 2529126258Smlaier while (r != NULL) { 2530126258Smlaier r->evaluations++; 2531126258Smlaier if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) || 2532126258Smlaier (r->ifp == ifp && r->ifnot))) 2533126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 2534126258Smlaier else if (r->direction && r->direction != direction) 2535126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 2536126258Smlaier else if (r->af && r->af != af) 2537126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 2538126258Smlaier else if (r->proto && r->proto != IPPROTO_UDP) 2539126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 2540126258Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not)) 2541126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 2542126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 2543126258Smlaier r->src.port[0], r->src.port[1], uh->uh_sport)) 2544126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 2545126258Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not)) 2546126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 2547126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 2548126258Smlaier r->dst.port[0], r->dst.port[1], uh->uh_dport)) 2549126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 2550126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 2551126258Smlaier r = TAILQ_NEXT(r, entries); 2552126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 2553126258Smlaier r = TAILQ_NEXT(r, entries); 2554126258Smlaier else if (r->uid.op && (lookup != -1 || (lookup = 2555126258Smlaier pf_socket_lookup(&uid, &gid, direction, af, IPPROTO_UDP, 2556126258Smlaier pd), 1)) && 2557126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 2558126258Smlaier uid)) 2559126258Smlaier r = TAILQ_NEXT(r, entries); 2560126258Smlaier else if (r->gid.op && (lookup != -1 || (lookup = 2561126258Smlaier pf_socket_lookup(&uid, &gid, direction, af, IPPROTO_UDP, 2562126258Smlaier pd), 1)) && 2563126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 2564126258Smlaier gid)) 2565126258Smlaier r = TAILQ_NEXT(r, entries); 2566126258Smlaier else if (r->match_tag && 2567126258Smlaier !pf_match_tag(m, r, nat, rdr, pftag, &tag)) 2568126258Smlaier r = TAILQ_NEXT(r, entries); 2569126258Smlaier else if (r->anchorname[0] && r->anchor == NULL) 2570126258Smlaier r = TAILQ_NEXT(r, entries); 2571126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 2572126258Smlaier r = TAILQ_NEXT(r, entries); 2573126258Smlaier else { 2574126258Smlaier if (r->tag) 2575126258Smlaier tag = r->tag; 2576126258Smlaier if (r->anchor == NULL) { 2577126258Smlaier *rm = r; 2578126258Smlaier *am = a; 2579126258Smlaier *rsm = ruleset; 2580126258Smlaier if ((*rm)->quick) 2581126258Smlaier break; 2582126258Smlaier r = TAILQ_NEXT(r, entries); 2583126258Smlaier } else 2584126258Smlaier PF_STEP_INTO_ANCHOR(r, a, ruleset, 2585126258Smlaier PF_RULESET_FILTER); 2586126258Smlaier } 2587126258Smlaier if (r == NULL && a != NULL) 2588126258Smlaier PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 2589126258Smlaier PF_RULESET_FILTER); 2590126258Smlaier } 2591126258Smlaier r = *rm; 2592126258Smlaier a = *am; 2593126258Smlaier ruleset = *rsm; 2594126258Smlaier 2595126258Smlaier r->packets++; 2596126258Smlaier r->bytes += pd->tot_len; 2597126258Smlaier if (a != NULL) { 2598126258Smlaier a->packets++; 2599126258Smlaier a->bytes += pd->tot_len; 2600126258Smlaier } 2601126258Smlaier REASON_SET(&reason, PFRES_MATCH); 2602126258Smlaier 2603126258Smlaier if (r->log) { 2604126258Smlaier if (rewrite) 2605126258Smlaier m_copyback(m, off, sizeof(*uh), uh); 2606126258Smlaier PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset); 2607126258Smlaier } 2608126258Smlaier 2609126258Smlaier if ((r->action == PF_DROP) && 2610126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 2611126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 2612126258Smlaier /* undo NAT changes, if they have taken place */ 2613126258Smlaier if (nat != NULL) { 2614126258Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 2615126258Smlaier &uh->uh_sum, &baddr, bport, 1, af); 2616126258Smlaier rewrite++; 2617126258Smlaier } else if (rdr != NULL) { 2618126258Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 2619126258Smlaier &uh->uh_sum, &baddr, bport, 1, af); 2620126258Smlaier rewrite++; 2621126258Smlaier } 2622126258Smlaier if ((af == AF_INET) && r->return_icmp) 2623126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 2624126258Smlaier r->return_icmp & 255, af, r); 2625126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 2626126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 2627126258Smlaier r->return_icmp6 & 255, af, r); 2628126258Smlaier } 2629126258Smlaier 2630126258Smlaier if (r->action == PF_DROP) 2631126258Smlaier return (PF_DROP); 2632126258Smlaier 2633126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 2634126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2635126258Smlaier return (PF_DROP); 2636126258Smlaier } 2637126258Smlaier 2638126258Smlaier if (r->keep_state || nat != NULL || rdr != NULL) { 2639126258Smlaier /* create new state */ 2640126258Smlaier struct pf_state *s = NULL; 2641126258Smlaier 2642126258Smlaier if (!r->max_states || r->states < r->max_states) 2643126258Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 2644126258Smlaier if (s == NULL) { 2645126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2646126258Smlaier return (PF_DROP); 2647126258Smlaier } 2648126258Smlaier bzero(s, sizeof(*s)); 2649126258Smlaier r->states++; 2650126258Smlaier if (a != NULL) 2651126258Smlaier a->states++; 2652126258Smlaier s->rule.ptr = r; 2653126258Smlaier if (nat != NULL) 2654126258Smlaier s->nat_rule.ptr = nat; 2655126258Smlaier else 2656126258Smlaier s->nat_rule.ptr = rdr; 2657126258Smlaier if (s->nat_rule.ptr != NULL) 2658126258Smlaier s->nat_rule.ptr->states++; 2659126258Smlaier s->anchor.ptr = a; 2660126258Smlaier s->allow_opts = r->allow_opts; 2661126258Smlaier s->log = r->log & 2; 2662126258Smlaier s->proto = IPPROTO_UDP; 2663126258Smlaier s->direction = direction; 2664126258Smlaier s->af = af; 2665126258Smlaier if (direction == PF_OUT) { 2666126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 2667126258Smlaier s->gwy.port = uh->uh_sport; 2668126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 2669126258Smlaier s->ext.port = uh->uh_dport; 2670126258Smlaier if (nat != NULL) { 2671126258Smlaier PF_ACPY(&s->lan.addr, &baddr, af); 2672126258Smlaier s->lan.port = bport; 2673126258Smlaier } else { 2674126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 2675126258Smlaier s->lan.port = s->gwy.port; 2676126258Smlaier } 2677126258Smlaier } else { 2678126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 2679126258Smlaier s->lan.port = uh->uh_dport; 2680126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 2681126258Smlaier s->ext.port = uh->uh_sport; 2682126258Smlaier if (rdr != NULL) { 2683126258Smlaier PF_ACPY(&s->gwy.addr, &baddr, af); 2684126258Smlaier s->gwy.port = bport; 2685126258Smlaier } else { 2686126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 2687126258Smlaier s->gwy.port = s->lan.port; 2688126258Smlaier } 2689126258Smlaier } 2690126258Smlaier s->src.state = PFUDPS_SINGLE; 2691126258Smlaier s->dst.state = PFUDPS_NO_TRAFFIC; 2692126258Smlaier s->creation = time.tv_sec; 2693126258Smlaier s->expire = time.tv_sec; 2694126258Smlaier s->timeout = PFTM_UDP_FIRST_PACKET; 2695126258Smlaier s->packets[0] = 1; 2696126258Smlaier s->bytes[0] = pd->tot_len; 2697126258Smlaier pf_set_rt_ifp(s, saddr); 2698126258Smlaier if (pf_insert_state(s)) { 2699126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2700126258Smlaier pool_put(&pf_state_pl, s); 2701126258Smlaier return (PF_DROP); 2702126258Smlaier } else 2703126258Smlaier *sm = s; 2704126258Smlaier } 2705126258Smlaier 2706126258Smlaier /* copy back packet headers if we performed NAT operations */ 2707126258Smlaier if (rewrite) 2708126258Smlaier m_copyback(m, off, sizeof(*uh), uh); 2709126258Smlaier 2710126258Smlaier return (PF_PASS); 2711126258Smlaier} 2712126258Smlaier 2713126258Smlaierint 2714126258Smlaierpf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 2715126258Smlaier struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h, 2716126258Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm) 2717126258Smlaier{ 2718126258Smlaier struct pf_rule *nat = NULL, *rdr = NULL; 2719126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2720126258Smlaier struct pf_addr baddr, naddr; 2721126258Smlaier struct pf_rule *r, *a = NULL; 2722126258Smlaier struct pf_ruleset *ruleset = NULL; 2723126258Smlaier u_short reason; 2724126258Smlaier u_int16_t icmpid; 2725126258Smlaier sa_family_t af = pd->af; 2726126258Smlaier u_int8_t icmptype, icmpcode; 2727126258Smlaier int state_icmp = 0; 2728126258Smlaier struct pf_tag *pftag = NULL; 2729126258Smlaier int tag = -1; 2730126258Smlaier#ifdef INET6 2731126258Smlaier int rewrite = 0; 2732126258Smlaier#endif /* INET6 */ 2733126258Smlaier 2734126258Smlaier switch (pd->proto) { 2735126258Smlaier#ifdef INET 2736126258Smlaier case IPPROTO_ICMP: 2737126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 2738126258Smlaier icmpcode = pd->hdr.icmp->icmp_code; 2739126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 2740126258Smlaier 2741126258Smlaier if (icmptype == ICMP_UNREACH || 2742126258Smlaier icmptype == ICMP_SOURCEQUENCH || 2743126258Smlaier icmptype == ICMP_REDIRECT || 2744126258Smlaier icmptype == ICMP_TIMXCEED || 2745126258Smlaier icmptype == ICMP_PARAMPROB) 2746126258Smlaier state_icmp++; 2747126258Smlaier break; 2748126258Smlaier#endif /* INET */ 2749126258Smlaier#ifdef INET6 2750126258Smlaier case IPPROTO_ICMPV6: 2751126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 2752126258Smlaier icmpcode = pd->hdr.icmp6->icmp6_code; 2753126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 2754126258Smlaier 2755126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 2756126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 2757126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 2758126258Smlaier icmptype == ICMP6_PARAM_PROB) 2759126258Smlaier state_icmp++; 2760126258Smlaier break; 2761126258Smlaier#endif /* INET6 */ 2762126258Smlaier } 2763126258Smlaier 2764126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2765126258Smlaier 2766126258Smlaier if (direction == PF_OUT) { 2767126258Smlaier /* check outgoing packet for BINAT/NAT */ 2768126258Smlaier if ((nat = pf_get_translation(pd, m, off, PF_OUT, ifp, saddr, 0, 2769126258Smlaier daddr, 0, &naddr, NULL)) != NULL) { 2770126258Smlaier PF_ACPY(&baddr, saddr, af); 2771126258Smlaier switch (af) { 2772126258Smlaier#ifdef INET 2773126258Smlaier case AF_INET: 2774126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 2775126258Smlaier naddr.v4.s_addr, 0); 2776126258Smlaier break; 2777126258Smlaier#endif /* INET */ 2778126258Smlaier#ifdef INET6 2779126258Smlaier case AF_INET6: 2780126258Smlaier pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 2781126258Smlaier &naddr, 0); 2782126258Smlaier rewrite++; 2783126258Smlaier break; 2784126258Smlaier#endif /* INET6 */ 2785126258Smlaier } 2786126258Smlaier if (nat->natpass) 2787126258Smlaier r = NULL; 2788126258Smlaier } 2789126258Smlaier } else { 2790126258Smlaier /* check incoming packet for BINAT/RDR */ 2791126258Smlaier if ((rdr = pf_get_translation(pd, m, off, PF_IN, ifp, saddr, 0, 2792126258Smlaier daddr, 0, &naddr, NULL)) != NULL) { 2793126258Smlaier PF_ACPY(&baddr, daddr, af); 2794126258Smlaier switch (af) { 2795126258Smlaier#ifdef INET 2796126258Smlaier case AF_INET: 2797126258Smlaier pf_change_a(&daddr->v4.s_addr, 2798126258Smlaier pd->ip_sum, naddr.v4.s_addr, 0); 2799126258Smlaier break; 2800126258Smlaier#endif /* INET */ 2801126258Smlaier#ifdef INET6 2802126258Smlaier case AF_INET6: 2803126258Smlaier pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 2804126258Smlaier &naddr, 0); 2805126258Smlaier rewrite++; 2806126258Smlaier break; 2807126258Smlaier#endif /* INET6 */ 2808126258Smlaier } 2809126258Smlaier if (rdr->natpass) 2810126258Smlaier r = NULL; 2811126258Smlaier } 2812126258Smlaier } 2813126258Smlaier 2814126258Smlaier while (r != NULL) { 2815126258Smlaier r->evaluations++; 2816126258Smlaier if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) || 2817126258Smlaier (r->ifp == ifp && r->ifnot))) 2818126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 2819126258Smlaier else if (r->direction && r->direction != direction) 2820126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 2821126258Smlaier else if (r->af && r->af != af) 2822126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 2823126258Smlaier else if (r->proto && r->proto != pd->proto) 2824126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 2825126258Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not)) 2826126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 2827126258Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not)) 2828126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 2829126258Smlaier else if (r->type && r->type != icmptype + 1) 2830126258Smlaier r = TAILQ_NEXT(r, entries); 2831126258Smlaier else if (r->code && r->code != icmpcode + 1) 2832126258Smlaier r = TAILQ_NEXT(r, entries); 2833126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 2834126258Smlaier r = TAILQ_NEXT(r, entries); 2835126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 2836126258Smlaier r = TAILQ_NEXT(r, entries); 2837126258Smlaier else if (r->match_tag && 2838126258Smlaier !pf_match_tag(m, r, nat, rdr, pftag, &tag)) 2839126258Smlaier r = TAILQ_NEXT(r, entries); 2840126258Smlaier else if (r->anchorname[0] && r->anchor == NULL) 2841126258Smlaier r = TAILQ_NEXT(r, entries); 2842126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 2843126258Smlaier r = TAILQ_NEXT(r, entries); 2844126258Smlaier else { 2845126258Smlaier if (r->tag) 2846126258Smlaier tag = r->tag; 2847126258Smlaier if (r->anchor == NULL) { 2848126258Smlaier *rm = r; 2849126258Smlaier *am = a; 2850126258Smlaier *rsm = ruleset; 2851126258Smlaier if ((*rm)->quick) 2852126258Smlaier break; 2853126258Smlaier r = TAILQ_NEXT(r, entries); 2854126258Smlaier } else 2855126258Smlaier PF_STEP_INTO_ANCHOR(r, a, ruleset, 2856126258Smlaier PF_RULESET_FILTER); 2857126258Smlaier } 2858126258Smlaier if (r == NULL && a != NULL) 2859126258Smlaier PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 2860126258Smlaier PF_RULESET_FILTER); 2861126258Smlaier } 2862126258Smlaier r = *rm; 2863126258Smlaier a = *am; 2864126258Smlaier ruleset = *rsm; 2865126258Smlaier 2866126258Smlaier r->packets++; 2867126258Smlaier r->bytes += pd->tot_len; 2868126258Smlaier if (a != NULL) { 2869126258Smlaier a->packets++; 2870126258Smlaier a->bytes += pd->tot_len; 2871126258Smlaier } 2872126258Smlaier REASON_SET(&reason, PFRES_MATCH); 2873126258Smlaier 2874126258Smlaier if (r->log) { 2875126258Smlaier#ifdef INET6 2876126258Smlaier if (rewrite) 2877126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 2878126258Smlaier pd->hdr.icmp6); 2879126258Smlaier#endif /* INET6 */ 2880126258Smlaier PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset); 2881126258Smlaier } 2882126258Smlaier 2883126258Smlaier if (r->action != PF_PASS) 2884126258Smlaier return (PF_DROP); 2885126258Smlaier 2886126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 2887126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2888126258Smlaier return (PF_DROP); 2889126258Smlaier } 2890126258Smlaier 2891126258Smlaier if (!state_icmp && (r->keep_state || 2892126258Smlaier nat != NULL || rdr != NULL)) { 2893126258Smlaier /* create new state */ 2894126258Smlaier struct pf_state *s = NULL; 2895126258Smlaier 2896126258Smlaier if (!r->max_states || r->states < r->max_states) 2897126258Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 2898126258Smlaier if (s == NULL) { 2899126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2900126258Smlaier return (PF_DROP); 2901126258Smlaier } 2902126258Smlaier bzero(s, sizeof(*s)); 2903126258Smlaier r->states++; 2904126258Smlaier if (a != NULL) 2905126258Smlaier a->states++; 2906126258Smlaier s->rule.ptr = r; 2907126258Smlaier if (nat != NULL) 2908126258Smlaier s->nat_rule.ptr = nat; 2909126258Smlaier else 2910126258Smlaier s->nat_rule.ptr = rdr; 2911126258Smlaier if (s->nat_rule.ptr != NULL) 2912126258Smlaier s->nat_rule.ptr->states++; 2913126258Smlaier s->anchor.ptr = a; 2914126258Smlaier s->allow_opts = r->allow_opts; 2915126258Smlaier s->log = r->log & 2; 2916126258Smlaier s->proto = pd->proto; 2917126258Smlaier s->direction = direction; 2918126258Smlaier s->af = af; 2919126258Smlaier if (direction == PF_OUT) { 2920126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 2921126258Smlaier s->gwy.port = icmpid; 2922126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 2923126258Smlaier s->ext.port = icmpid; 2924126258Smlaier if (nat != NULL) 2925126258Smlaier PF_ACPY(&s->lan.addr, &baddr, af); 2926126258Smlaier else 2927126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 2928126258Smlaier s->lan.port = icmpid; 2929126258Smlaier } else { 2930126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 2931126258Smlaier s->lan.port = icmpid; 2932126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 2933126258Smlaier s->ext.port = icmpid; 2934126258Smlaier if (rdr != NULL) 2935126258Smlaier PF_ACPY(&s->gwy.addr, &baddr, af); 2936126258Smlaier else 2937126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 2938126258Smlaier s->gwy.port = icmpid; 2939126258Smlaier } 2940126258Smlaier s->creation = time.tv_sec; 2941126258Smlaier s->expire = time.tv_sec; 2942126258Smlaier s->timeout = PFTM_ICMP_FIRST_PACKET; 2943126258Smlaier s->packets[0] = 1; 2944126258Smlaier s->bytes[0] = pd->tot_len; 2945126258Smlaier pf_set_rt_ifp(s, saddr); 2946126258Smlaier if (pf_insert_state(s)) { 2947126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 2948126258Smlaier pool_put(&pf_state_pl, s); 2949126258Smlaier return (PF_DROP); 2950126258Smlaier } else 2951126258Smlaier *sm = s; 2952126258Smlaier } 2953126258Smlaier 2954126258Smlaier#ifdef INET6 2955126258Smlaier /* copy back packet headers if we performed IPv6 NAT operations */ 2956126258Smlaier if (rewrite) 2957126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 2958126258Smlaier pd->hdr.icmp6); 2959126258Smlaier#endif /* INET6 */ 2960126258Smlaier 2961126258Smlaier return (PF_PASS); 2962126258Smlaier} 2963126258Smlaier 2964126258Smlaierint 2965126258Smlaierpf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 2966126258Smlaier struct ifnet *ifp, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 2967126258Smlaier struct pf_rule **am, struct pf_ruleset **rsm) 2968126258Smlaier{ 2969126258Smlaier struct pf_rule *nat = NULL, *rdr = NULL; 2970126258Smlaier struct pf_rule *r, *a = NULL; 2971126258Smlaier struct pf_ruleset *ruleset = NULL; 2972126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2973126258Smlaier struct pf_addr baddr, naddr; 2974126258Smlaier sa_family_t af = pd->af; 2975126258Smlaier u_short reason; 2976126258Smlaier struct pf_tag *pftag = NULL; 2977126258Smlaier int tag = -1; 2978126258Smlaier 2979126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2980126258Smlaier 2981126258Smlaier if (direction == PF_OUT) { 2982126258Smlaier /* check outgoing packet for BINAT/NAT */ 2983126258Smlaier if ((nat = pf_get_translation(pd, m, off, PF_OUT, ifp, saddr, 0, 2984126258Smlaier daddr, 0, &naddr, NULL)) != NULL) { 2985126258Smlaier PF_ACPY(&baddr, saddr, af); 2986126258Smlaier switch (af) { 2987126258Smlaier#ifdef INET 2988126258Smlaier case AF_INET: 2989126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 2990126258Smlaier naddr.v4.s_addr, 0); 2991126258Smlaier break; 2992126258Smlaier#endif /* INET */ 2993126258Smlaier#ifdef INET6 2994126258Smlaier case AF_INET6: 2995126258Smlaier PF_ACPY(saddr, &naddr, af); 2996126258Smlaier break; 2997126258Smlaier#endif /* INET6 */ 2998126258Smlaier } 2999126258Smlaier if (nat->natpass) 3000126258Smlaier r = NULL; 3001126258Smlaier } 3002126258Smlaier } else { 3003126258Smlaier /* check incoming packet for BINAT/RDR */ 3004126258Smlaier if ((rdr = pf_get_translation(pd, m, off, PF_IN, ifp, saddr, 0, 3005126258Smlaier daddr, 0, &naddr, NULL)) != NULL) { 3006126258Smlaier PF_ACPY(&baddr, daddr, af); 3007126258Smlaier switch (af) { 3008126258Smlaier#ifdef INET 3009126258Smlaier case AF_INET: 3010126258Smlaier pf_change_a(&daddr->v4.s_addr, 3011126258Smlaier pd->ip_sum, naddr.v4.s_addr, 0); 3012126258Smlaier break; 3013126258Smlaier#endif /* INET */ 3014126258Smlaier#ifdef INET6 3015126258Smlaier case AF_INET6: 3016126258Smlaier PF_ACPY(daddr, &naddr, af); 3017126258Smlaier break; 3018126258Smlaier#endif /* INET6 */ 3019126258Smlaier } 3020126258Smlaier if (rdr->natpass) 3021126258Smlaier r = NULL; 3022126258Smlaier } 3023126258Smlaier } 3024126258Smlaier 3025126258Smlaier while (r != NULL) { 3026126258Smlaier r->evaluations++; 3027126258Smlaier if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) || 3028126258Smlaier (r->ifp == ifp && r->ifnot))) 3029126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3030126258Smlaier else if (r->direction && r->direction != direction) 3031126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3032126258Smlaier else if (r->af && r->af != af) 3033126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3034126258Smlaier else if (r->proto && r->proto != pd->proto) 3035126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3036126258Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not)) 3037126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3038126258Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not)) 3039126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3040126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 3041126258Smlaier r = TAILQ_NEXT(r, entries); 3042126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3043126258Smlaier r = TAILQ_NEXT(r, entries); 3044126258Smlaier else if (r->match_tag && 3045126258Smlaier !pf_match_tag(m, r, nat, rdr, pftag, &tag)) 3046126258Smlaier r = TAILQ_NEXT(r, entries); 3047126258Smlaier else if (r->anchorname[0] && r->anchor == NULL) 3048126258Smlaier r = TAILQ_NEXT(r, entries); 3049126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 3050126258Smlaier r = TAILQ_NEXT(r, entries); 3051126258Smlaier else { 3052126258Smlaier if (r->tag) 3053126258Smlaier tag = r->tag; 3054126258Smlaier if (r->anchor == NULL) { 3055126258Smlaier *rm = r; 3056126258Smlaier *am = a; 3057126258Smlaier *rsm = ruleset; 3058126258Smlaier if ((*rm)->quick) 3059126258Smlaier break; 3060126258Smlaier r = TAILQ_NEXT(r, entries); 3061126258Smlaier } else 3062126258Smlaier PF_STEP_INTO_ANCHOR(r, a, ruleset, 3063126258Smlaier PF_RULESET_FILTER); 3064126258Smlaier } 3065126258Smlaier if (r == NULL && a != NULL) 3066126258Smlaier PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 3067126258Smlaier PF_RULESET_FILTER); 3068126258Smlaier } 3069126258Smlaier r = *rm; 3070126258Smlaier a = *am; 3071126258Smlaier ruleset = *rsm; 3072126258Smlaier 3073126258Smlaier r->packets++; 3074126258Smlaier r->bytes += pd->tot_len; 3075126258Smlaier if (a != NULL) { 3076126258Smlaier a->packets++; 3077126258Smlaier a->bytes += pd->tot_len; 3078126258Smlaier } 3079126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3080126258Smlaier if (r->log) 3081126258Smlaier PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset); 3082126258Smlaier 3083126258Smlaier if ((r->action == PF_DROP) && 3084126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 3085126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3086126258Smlaier struct pf_addr *a = NULL; 3087126258Smlaier 3088126258Smlaier if (nat != NULL) 3089126258Smlaier a = saddr; 3090126258Smlaier else if (rdr != NULL) 3091126258Smlaier a = daddr; 3092126258Smlaier if (a != NULL) { 3093126258Smlaier switch (af) { 3094126258Smlaier#ifdef INET 3095126258Smlaier case AF_INET: 3096126258Smlaier pf_change_a(&a->v4.s_addr, pd->ip_sum, 3097126258Smlaier baddr.v4.s_addr, 0); 3098126258Smlaier break; 3099126258Smlaier#endif /* INET */ 3100126258Smlaier#ifdef INET6 3101126258Smlaier case AF_INET6: 3102126258Smlaier PF_ACPY(a, &baddr, af); 3103126258Smlaier break; 3104126258Smlaier#endif /* INET6 */ 3105126258Smlaier } 3106126258Smlaier } 3107126258Smlaier if ((af == AF_INET) && r->return_icmp) 3108126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3109126258Smlaier r->return_icmp & 255, af, r); 3110126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3111126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3112126258Smlaier r->return_icmp6 & 255, af, r); 3113126258Smlaier } 3114126258Smlaier 3115126258Smlaier if (r->action != PF_PASS) 3116126258Smlaier return (PF_DROP); 3117126258Smlaier 3118126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 3119126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3120126258Smlaier return (PF_DROP); 3121126258Smlaier } 3122126258Smlaier 3123126258Smlaier if (r->keep_state || nat != NULL || rdr != NULL) { 3124126258Smlaier /* create new state */ 3125126258Smlaier struct pf_state *s = NULL; 3126126258Smlaier 3127126258Smlaier if (!r->max_states || r->states < r->max_states) 3128126258Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3129126258Smlaier if (s == NULL) { 3130126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3131126258Smlaier return (PF_DROP); 3132126258Smlaier } 3133126258Smlaier bzero(s, sizeof(*s)); 3134126258Smlaier r->states++; 3135126258Smlaier if (a != NULL) 3136126258Smlaier a->states++; 3137126258Smlaier s->rule.ptr = r; 3138126258Smlaier if (nat != NULL) 3139126258Smlaier s->nat_rule.ptr = nat; 3140126258Smlaier else 3141126258Smlaier s->nat_rule.ptr = rdr; 3142126258Smlaier if (s->nat_rule.ptr != NULL) 3143126258Smlaier s->nat_rule.ptr->states++; 3144126258Smlaier s->anchor.ptr = a; 3145126258Smlaier s->allow_opts = r->allow_opts; 3146126258Smlaier s->log = r->log & 2; 3147126258Smlaier s->proto = pd->proto; 3148126258Smlaier s->direction = direction; 3149126258Smlaier s->af = af; 3150126258Smlaier if (direction == PF_OUT) { 3151126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3152126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3153126258Smlaier if (nat != NULL) 3154126258Smlaier PF_ACPY(&s->lan.addr, &baddr, af); 3155126258Smlaier else 3156126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3157126258Smlaier } else { 3158126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3159126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3160126258Smlaier if (rdr != NULL) 3161126258Smlaier PF_ACPY(&s->gwy.addr, &baddr, af); 3162126258Smlaier else 3163126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3164126258Smlaier } 3165126258Smlaier s->src.state = PFOTHERS_SINGLE; 3166126258Smlaier s->dst.state = PFOTHERS_NO_TRAFFIC; 3167126258Smlaier s->creation = time.tv_sec; 3168126258Smlaier s->expire = time.tv_sec; 3169126258Smlaier s->timeout = PFTM_OTHER_FIRST_PACKET; 3170126258Smlaier s->packets[0] = 1; 3171126258Smlaier s->bytes[0] = pd->tot_len; 3172126258Smlaier pf_set_rt_ifp(s, saddr); 3173126258Smlaier if (pf_insert_state(s)) { 3174126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3175126258Smlaier if (r->log) 3176126258Smlaier PFLOG_PACKET(ifp, h, m, af, direction, reason, 3177126258Smlaier r, a, ruleset); 3178126258Smlaier pool_put(&pf_state_pl, s); 3179126258Smlaier return (PF_DROP); 3180126258Smlaier } else 3181126258Smlaier *sm = s; 3182126258Smlaier } 3183126258Smlaier 3184126258Smlaier return (PF_PASS); 3185126258Smlaier} 3186126258Smlaier 3187126258Smlaierint 3188126258Smlaierpf_test_fragment(struct pf_rule **rm, int direction, struct ifnet *ifp, 3189126258Smlaier struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3190126258Smlaier struct pf_ruleset **rsm) 3191126258Smlaier{ 3192126258Smlaier struct pf_rule *r, *a = NULL; 3193126258Smlaier struct pf_ruleset *ruleset = NULL; 3194126258Smlaier sa_family_t af = pd->af; 3195126258Smlaier u_short reason; 3196126258Smlaier struct pf_tag *pftag = NULL; 3197126258Smlaier int tag = -1; 3198126258Smlaier 3199126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3200126258Smlaier while (r != NULL) { 3201126258Smlaier r->evaluations++; 3202126258Smlaier if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) || 3203126258Smlaier (r->ifp == ifp && r->ifnot))) 3204126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3205126258Smlaier else if (r->direction && r->direction != direction) 3206126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3207126258Smlaier else if (r->af && r->af != af) 3208126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3209126258Smlaier else if (r->proto && r->proto != pd->proto) 3210126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3211126258Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not)) 3212126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3213126258Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not)) 3214126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3215126258Smlaier else if (r->tos && !(r->tos & pd->tos)) 3216126258Smlaier r = TAILQ_NEXT(r, entries); 3217126258Smlaier else if (r->src.port_op || r->dst.port_op || 3218126258Smlaier r->flagset || r->type || r->code || 3219126258Smlaier r->os_fingerprint != PF_OSFP_ANY) 3220126258Smlaier r = TAILQ_NEXT(r, entries); 3221126258Smlaier else if (r->match_tag && 3222126258Smlaier !pf_match_tag(m, r, NULL, NULL, pftag, &tag)) 3223126258Smlaier r = TAILQ_NEXT(r, entries); 3224126258Smlaier else if (r->anchorname[0] && r->anchor == NULL) 3225126258Smlaier r = TAILQ_NEXT(r, entries); 3226126258Smlaier else { 3227126258Smlaier if (r->anchor == NULL) { 3228126258Smlaier *rm = r; 3229126258Smlaier *am = a; 3230126258Smlaier *rsm = ruleset; 3231126258Smlaier if ((*rm)->quick) 3232126258Smlaier break; 3233126258Smlaier r = TAILQ_NEXT(r, entries); 3234126258Smlaier } else 3235126258Smlaier PF_STEP_INTO_ANCHOR(r, a, ruleset, 3236126258Smlaier PF_RULESET_FILTER); 3237126258Smlaier } 3238126258Smlaier if (r == NULL && a != NULL) 3239126258Smlaier PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 3240126258Smlaier PF_RULESET_FILTER); 3241126258Smlaier } 3242126258Smlaier r = *rm; 3243126258Smlaier a = *am; 3244126258Smlaier ruleset = *rsm; 3245126258Smlaier 3246126258Smlaier r->packets++; 3247126258Smlaier r->bytes += pd->tot_len; 3248126258Smlaier if (a != NULL) { 3249126258Smlaier a->packets++; 3250126258Smlaier a->bytes += pd->tot_len; 3251126258Smlaier } 3252126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3253126258Smlaier if (r->log) 3254126258Smlaier PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset); 3255126258Smlaier 3256126258Smlaier if (r->action != PF_PASS) 3257126258Smlaier return (PF_DROP); 3258126258Smlaier 3259126258Smlaier if (pf_tag_packet(m, pftag, tag)) { 3260126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3261126258Smlaier return (PF_DROP); 3262126258Smlaier } 3263126258Smlaier 3264126258Smlaier return (PF_PASS); 3265126258Smlaier} 3266126258Smlaier 3267126258Smlaierint 3268126258Smlaierpf_test_state_tcp(struct pf_state **state, int direction, struct ifnet *ifp, 3269126258Smlaier struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd, 3270126258Smlaier u_short *reason) 3271126258Smlaier{ 3272126258Smlaier struct pf_tree_node key; 3273126258Smlaier struct tcphdr *th = pd->hdr.tcp; 3274126258Smlaier u_int16_t win = ntohs(th->th_win); 3275126258Smlaier u_int32_t ack, end, seq; 3276126258Smlaier u_int8_t sws, dws; 3277126258Smlaier int ackskew, dirndx; 3278126258Smlaier int copyback = 0; 3279126258Smlaier struct pf_state_peer *src, *dst; 3280126258Smlaier 3281126258Smlaier key.af = pd->af; 3282126258Smlaier key.proto = IPPROTO_TCP; 3283126258Smlaier PF_ACPY(&key.addr[0], pd->src, key.af); 3284126258Smlaier PF_ACPY(&key.addr[1], pd->dst, key.af); 3285126258Smlaier key.port[0] = th->th_sport; 3286126258Smlaier key.port[1] = th->th_dport; 3287126258Smlaier 3288126258Smlaier STATE_LOOKUP(); 3289126258Smlaier 3290126258Smlaier if (direction == (*state)->direction) { 3291126258Smlaier src = &(*state)->src; 3292126258Smlaier dst = &(*state)->dst; 3293126258Smlaier dirndx = 0; 3294126258Smlaier } else { 3295126258Smlaier src = &(*state)->dst; 3296126258Smlaier dst = &(*state)->src; 3297126258Smlaier dirndx = 1; 3298126258Smlaier } 3299126258Smlaier 3300126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 3301126258Smlaier if (direction != (*state)->direction) 3302126258Smlaier return (PF_SYNPROXY_DROP); 3303126258Smlaier if (th->th_flags & TH_SYN) { 3304126258Smlaier if (ntohl(th->th_seq) != (*state)->src.seqlo) 3305126258Smlaier return (PF_DROP); 3306126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3307126258Smlaier pd->src, th->th_dport, th->th_sport, 3308126258Smlaier (*state)->src.seqhi, ntohl(th->th_seq) + 1, 3309126258Smlaier TH_SYN|TH_ACK, 0, (*state)->src.mss, 0); 3310126258Smlaier return (PF_SYNPROXY_DROP); 3311126258Smlaier } else if (!(th->th_flags & TH_ACK) || 3312126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3313126258Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) 3314126258Smlaier return (PF_DROP); 3315126258Smlaier else 3316126258Smlaier (*state)->src.state = PF_TCPS_PROXY_DST; 3317126258Smlaier } 3318126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_DST) { 3319126258Smlaier struct pf_state_host *src, *dst; 3320126258Smlaier 3321126258Smlaier if (direction == PF_OUT) { 3322126258Smlaier src = &(*state)->gwy; 3323126258Smlaier dst = &(*state)->ext; 3324126258Smlaier } else { 3325126258Smlaier src = &(*state)->ext; 3326126258Smlaier dst = &(*state)->lan; 3327126258Smlaier } 3328126258Smlaier if (direction == (*state)->direction) { 3329126258Smlaier if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 3330126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3331126258Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) 3332126258Smlaier return (PF_DROP); 3333126258Smlaier (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 3334126258Smlaier if ((*state)->dst.seqhi == 1) 3335126258Smlaier (*state)->dst.seqhi = arc4random(); 3336126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3337126258Smlaier &dst->addr, src->port, dst->port, 3338126258Smlaier (*state)->dst.seqhi, 0, TH_SYN, 0, (*state)->src.mss, 0); 3339126258Smlaier return (PF_SYNPROXY_DROP); 3340126258Smlaier } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 3341126258Smlaier (TH_SYN|TH_ACK)) || 3342126258Smlaier (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) 3343126258Smlaier return (PF_DROP); 3344126258Smlaier else { 3345126258Smlaier (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 3346126258Smlaier (*state)->dst.seqlo = ntohl(th->th_seq); 3347126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3348126258Smlaier pd->src, th->th_dport, th->th_sport, 3349126258Smlaier ntohl(th->th_ack), ntohl(th->th_seq) + 1, 3350126258Smlaier TH_ACK, (*state)->src.max_win, 0, 0); 3351126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3352126258Smlaier &dst->addr, src->port, dst->port, 3353126258Smlaier (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 3354126258Smlaier TH_ACK, (*state)->dst.max_win, 0, 0); 3355126258Smlaier (*state)->src.seqdiff = (*state)->dst.seqhi - 3356126258Smlaier (*state)->src.seqlo; 3357126258Smlaier (*state)->dst.seqdiff = (*state)->src.seqhi - 3358126258Smlaier (*state)->dst.seqlo; 3359126258Smlaier (*state)->src.seqhi = (*state)->src.seqlo + 3360126258Smlaier (*state)->src.max_win; 3361126258Smlaier (*state)->dst.seqhi = (*state)->dst.seqlo + 3362126258Smlaier (*state)->dst.max_win; 3363126258Smlaier (*state)->src.wscale = (*state)->dst.wscale = 0; 3364126258Smlaier (*state)->src.state = (*state)->dst.state = 3365126258Smlaier TCPS_ESTABLISHED; 3366126258Smlaier return (PF_SYNPROXY_DROP); 3367126258Smlaier } 3368126258Smlaier } 3369126258Smlaier 3370126258Smlaier if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3371126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 3372126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 3373126258Smlaier } else 3374126258Smlaier sws = dws = 0; 3375126258Smlaier 3376126258Smlaier /* 3377126258Smlaier * Sequence tracking algorithm from Guido van Rooij's paper: 3378126258Smlaier * http://www.madison-gurkha.com/publications/tcp_filtering/ 3379126258Smlaier * tcp_filtering.ps 3380126258Smlaier */ 3381126258Smlaier 3382126258Smlaier seq = ntohl(th->th_seq); 3383126258Smlaier if (src->seqlo == 0) { 3384126258Smlaier /* First packet from this end. Set its state */ 3385126258Smlaier 3386126258Smlaier if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3387126258Smlaier src->scrub == NULL) { 3388126258Smlaier if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3389126258Smlaier REASON_SET(reason, PFRES_MEMORY); 3390126258Smlaier return (PF_DROP); 3391126258Smlaier } 3392126258Smlaier } 3393126258Smlaier 3394126258Smlaier /* Deferred generation of sequence number modulator */ 3395126258Smlaier if (dst->seqdiff && !src->seqdiff) { 3396126258Smlaier while ((src->seqdiff = arc4random()) == 0) 3397126258Smlaier ; 3398126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 3399126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3400126258Smlaier src->seqdiff), 0); 3401126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3402126258Smlaier copyback = 1; 3403126258Smlaier } else { 3404126258Smlaier ack = ntohl(th->th_ack); 3405126258Smlaier } 3406126258Smlaier 3407126258Smlaier end = seq + pd->p_len; 3408126258Smlaier if (th->th_flags & TH_SYN) { 3409126258Smlaier end++; 3410126258Smlaier if (dst->wscale & PF_WSCALE_FLAG) { 3411126258Smlaier src->wscale = pf_get_wscale(m, off, th->th_off, 3412126258Smlaier pd->af); 3413126258Smlaier if (src->wscale & PF_WSCALE_FLAG) { 3414126258Smlaier /* Remove scale factor from initial 3415126258Smlaier * window */ 3416126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 3417126258Smlaier win = ((u_int32_t)win + (1 << sws) - 1) 3418126258Smlaier >> sws; 3419126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 3420126258Smlaier } else { 3421126258Smlaier /* fixup other window */ 3422126258Smlaier dst->max_win <<= dst->wscale & 3423126258Smlaier PF_WSCALE_MASK; 3424126258Smlaier /* in case of a retrans SYN|ACK */ 3425126258Smlaier dst->wscale = 0; 3426126258Smlaier } 3427126258Smlaier } 3428126258Smlaier } 3429126258Smlaier if (th->th_flags & TH_FIN) 3430126258Smlaier end++; 3431126258Smlaier 3432126258Smlaier src->seqlo = seq; 3433126258Smlaier if (src->state < TCPS_SYN_SENT) 3434126258Smlaier src->state = TCPS_SYN_SENT; 3435126258Smlaier 3436126258Smlaier /* 3437126258Smlaier * May need to slide the window (seqhi may have been set by 3438126258Smlaier * the crappy stack check or if we picked up the connection 3439126258Smlaier * after establishment) 3440126258Smlaier */ 3441126258Smlaier if (src->seqhi == 1 || 3442126258Smlaier SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3443126258Smlaier src->seqhi = end + MAX(1, dst->max_win << dws); 3444126258Smlaier if (win > src->max_win) 3445126258Smlaier src->max_win = win; 3446126258Smlaier 3447126258Smlaier } else { 3448126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 3449126258Smlaier if (src->seqdiff) { 3450126258Smlaier /* Modulate sequence numbers */ 3451126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3452126258Smlaier src->seqdiff), 0); 3453126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3454126258Smlaier copyback = 1; 3455126258Smlaier } 3456126258Smlaier end = seq + pd->p_len; 3457126258Smlaier if (th->th_flags & TH_SYN) 3458126258Smlaier end++; 3459126258Smlaier if (th->th_flags & TH_FIN) 3460126258Smlaier end++; 3461126258Smlaier } 3462126258Smlaier 3463126258Smlaier if ((th->th_flags & TH_ACK) == 0) { 3464126258Smlaier /* Let it pass through the ack skew check */ 3465126258Smlaier ack = dst->seqlo; 3466126258Smlaier } else if ((ack == 0 && 3467126258Smlaier (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3468126258Smlaier /* broken tcp stacks do not set ack */ 3469126258Smlaier (dst->state < TCPS_SYN_SENT)) { 3470126258Smlaier /* 3471126258Smlaier * Many stacks (ours included) will set the ACK number in an 3472126258Smlaier * FIN|ACK if the SYN times out -- no sequence to ACK. 3473126258Smlaier */ 3474126258Smlaier ack = dst->seqlo; 3475126258Smlaier } 3476126258Smlaier 3477126258Smlaier if (seq == end) { 3478126258Smlaier /* Ease sequencing restrictions on no data packets */ 3479126258Smlaier seq = src->seqlo; 3480126258Smlaier end = seq; 3481126258Smlaier } 3482126258Smlaier 3483126258Smlaier ackskew = dst->seqlo - ack; 3484126258Smlaier 3485126258Smlaier#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3486126258Smlaier if (SEQ_GEQ(src->seqhi, end) && 3487126258Smlaier /* Last octet inside other's window space */ 3488126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3489126258Smlaier /* Retrans: not more than one window back */ 3490126258Smlaier (ackskew >= -MAXACKWINDOW) && 3491126258Smlaier /* Acking not more than one reassembled fragment backwards */ 3492126258Smlaier (ackskew <= (MAXACKWINDOW << sws))) { 3493126258Smlaier /* Acking not more than one window forward */ 3494126258Smlaier 3495126258Smlaier (*state)->packets[dirndx]++; 3496126258Smlaier (*state)->bytes[dirndx] += pd->tot_len; 3497126258Smlaier 3498126258Smlaier /* update max window */ 3499126258Smlaier if (src->max_win < win) 3500126258Smlaier src->max_win = win; 3501126258Smlaier /* synchronize sequencing */ 3502126258Smlaier if (SEQ_GT(end, src->seqlo)) 3503126258Smlaier src->seqlo = end; 3504126258Smlaier /* slide the window of what the other end can send */ 3505126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3506126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 3507126258Smlaier 3508126258Smlaier 3509126258Smlaier /* update states */ 3510126258Smlaier if (th->th_flags & TH_SYN) 3511126258Smlaier if (src->state < TCPS_SYN_SENT) 3512126258Smlaier src->state = TCPS_SYN_SENT; 3513126258Smlaier if (th->th_flags & TH_FIN) 3514126258Smlaier if (src->state < TCPS_CLOSING) 3515126258Smlaier src->state = TCPS_CLOSING; 3516126258Smlaier if (th->th_flags & TH_ACK) { 3517126258Smlaier if (dst->state == TCPS_SYN_SENT) 3518126258Smlaier dst->state = TCPS_ESTABLISHED; 3519126258Smlaier else if (dst->state == TCPS_CLOSING) 3520126258Smlaier dst->state = TCPS_FIN_WAIT_2; 3521126258Smlaier } 3522126258Smlaier if (th->th_flags & TH_RST) 3523126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 3524126258Smlaier 3525126258Smlaier /* update expire time */ 3526126258Smlaier (*state)->expire = time.tv_sec; 3527126258Smlaier if (src->state >= TCPS_FIN_WAIT_2 && 3528126258Smlaier dst->state >= TCPS_FIN_WAIT_2) 3529126258Smlaier (*state)->timeout = PFTM_TCP_CLOSED; 3530126258Smlaier else if (src->state >= TCPS_FIN_WAIT_2 || 3531126258Smlaier dst->state >= TCPS_FIN_WAIT_2) 3532126258Smlaier (*state)->timeout = PFTM_TCP_FIN_WAIT; 3533126258Smlaier else if (src->state < TCPS_ESTABLISHED || 3534126258Smlaier dst->state < TCPS_ESTABLISHED) 3535126258Smlaier (*state)->timeout = PFTM_TCP_OPENING; 3536126258Smlaier else if (src->state >= TCPS_CLOSING || 3537126258Smlaier dst->state >= TCPS_CLOSING) 3538126258Smlaier (*state)->timeout = PFTM_TCP_CLOSING; 3539126258Smlaier else 3540126258Smlaier (*state)->timeout = PFTM_TCP_ESTABLISHED; 3541126258Smlaier 3542126258Smlaier /* Fall through to PASS packet */ 3543126258Smlaier 3544126258Smlaier } else if ((dst->state < TCPS_SYN_SENT || 3545126258Smlaier dst->state >= TCPS_FIN_WAIT_2 || 3546126258Smlaier src->state >= TCPS_FIN_WAIT_2) && 3547126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 3548126258Smlaier /* Within a window forward of the originating packet */ 3549126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 3550126258Smlaier /* Within a window backward of the originating packet */ 3551126258Smlaier 3552126258Smlaier /* 3553126258Smlaier * This currently handles three situations: 3554126258Smlaier * 1) Stupid stacks will shotgun SYNs before their peer 3555126258Smlaier * replies. 3556126258Smlaier * 2) When PF catches an already established stream (the 3557126258Smlaier * firewall rebooted, the state table was flushed, routes 3558126258Smlaier * changed...) 3559126258Smlaier * 3) Packets get funky immediately after the connection 3560126258Smlaier * closes (this should catch Solaris spurious ACK|FINs 3561126258Smlaier * that web servers like to spew after a close) 3562126258Smlaier * 3563126258Smlaier * This must be a little more careful than the above code 3564126258Smlaier * since packet floods will also be caught here. We don't 3565126258Smlaier * update the TTL here to mitigate the damage of a packet 3566126258Smlaier * flood and so the same code can handle awkward establishment 3567126258Smlaier * and a loosened connection close. 3568126258Smlaier * In the establishment case, a correct peer response will 3569126258Smlaier * validate the connection, go through the normal state code 3570126258Smlaier * and keep updating the state TTL. 3571126258Smlaier */ 3572126258Smlaier 3573126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 3574126258Smlaier printf("pf: loose state match: "); 3575126258Smlaier pf_print_state(*state); 3576126258Smlaier pf_print_flags(th->th_flags); 3577126258Smlaier printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n", 3578126258Smlaier seq, ack, pd->p_len, ackskew, 3579126258Smlaier (*state)->packets[0], (*state)->packets[1]); 3580126258Smlaier } 3581126258Smlaier 3582126258Smlaier (*state)->packets[dirndx]++; 3583126258Smlaier (*state)->bytes[dirndx] += pd->tot_len; 3584126258Smlaier 3585126258Smlaier /* update max window */ 3586126258Smlaier if (src->max_win < win) 3587126258Smlaier src->max_win = win; 3588126258Smlaier /* synchronize sequencing */ 3589126258Smlaier if (SEQ_GT(end, src->seqlo)) 3590126258Smlaier src->seqlo = end; 3591126258Smlaier /* slide the window of what the other end can send */ 3592126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3593126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 3594126258Smlaier 3595126258Smlaier /* 3596126258Smlaier * Cannot set dst->seqhi here since this could be a shotgunned 3597126258Smlaier * SYN and not an already established connection. 3598126258Smlaier */ 3599126258Smlaier 3600126258Smlaier if (th->th_flags & TH_FIN) 3601126258Smlaier if (src->state < TCPS_CLOSING) 3602126258Smlaier src->state = TCPS_CLOSING; 3603126258Smlaier if (th->th_flags & TH_RST) 3604126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 3605126258Smlaier 3606126258Smlaier /* Fall through to PASS packet */ 3607126258Smlaier 3608126258Smlaier } else { 3609126258Smlaier if ((*state)->dst.state == TCPS_SYN_SENT && 3610126258Smlaier (*state)->src.state == TCPS_SYN_SENT) { 3611126258Smlaier /* Send RST for state mismatches during handshake */ 3612126258Smlaier if (!(th->th_flags & TH_RST)) { 3613126258Smlaier u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3614126258Smlaier 3615126258Smlaier if (th->th_flags & TH_SYN) 3616126258Smlaier ack++; 3617126258Smlaier if (th->th_flags & TH_FIN) 3618126258Smlaier ack++; 3619126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, 3620126258Smlaier pd->dst, pd->src, th->th_dport, 3621126258Smlaier th->th_sport, ntohl(th->th_ack), ack, 3622126258Smlaier TH_RST|TH_ACK, 0, 0, 3623126258Smlaier (*state)->rule.ptr->return_ttl); 3624126258Smlaier } 3625126258Smlaier src->seqlo = 0; 3626126258Smlaier src->seqhi = 1; 3627126258Smlaier src->max_win = 1; 3628126258Smlaier } else if (pf_status.debug >= PF_DEBUG_MISC) { 3629126258Smlaier printf("pf: BAD state: "); 3630126258Smlaier pf_print_state(*state); 3631126258Smlaier pf_print_flags(th->th_flags); 3632126258Smlaier printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d " 3633126258Smlaier "dir=%s,%s\n", seq, ack, pd->p_len, ackskew, 3634126258Smlaier (*state)->packets[0], (*state)->packets[1], 3635126258Smlaier direction == PF_IN ? "in" : "out", 3636126258Smlaier direction == (*state)->direction ? "fwd" : "rev"); 3637126258Smlaier printf("pf: State failure on: %c %c %c %c | %c %c\n", 3638126258Smlaier SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 3639126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 3640126258Smlaier ' ': '2', 3641126258Smlaier (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 3642126258Smlaier (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 3643126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 3644126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 3645126258Smlaier } 3646126258Smlaier return (PF_DROP); 3647126258Smlaier } 3648126258Smlaier 3649126258Smlaier if (dst->scrub || src->scrub) { 3650126258Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, src, dst, 3651126258Smlaier ©back)) 3652126258Smlaier return (PF_DROP); 3653126258Smlaier } 3654126258Smlaier 3655126258Smlaier /* Any packets which have gotten here are to be passed */ 3656126258Smlaier 3657126258Smlaier /* translate source/destination address, if necessary */ 3658126258Smlaier if (STATE_TRANSLATE(*state)) { 3659126258Smlaier if (direction == PF_OUT) 3660126258Smlaier pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 3661126258Smlaier &th->th_sum, &(*state)->gwy.addr, 3662126258Smlaier (*state)->gwy.port, 0, pd->af); 3663126258Smlaier else 3664126258Smlaier pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 3665126258Smlaier &th->th_sum, &(*state)->lan.addr, 3666126258Smlaier (*state)->lan.port, 0, pd->af); 3667126258Smlaier m_copyback(m, off, sizeof(*th), th); 3668126258Smlaier } else if (copyback) { 3669126258Smlaier /* Copyback sequence modulation or stateful scrub changes */ 3670126258Smlaier m_copyback(m, off, sizeof(*th), th); 3671126258Smlaier } 3672126258Smlaier 3673126258Smlaier (*state)->rule.ptr->packets++; 3674126258Smlaier (*state)->rule.ptr->bytes += pd->tot_len; 3675126258Smlaier if ((*state)->nat_rule.ptr != NULL) { 3676126258Smlaier (*state)->nat_rule.ptr->packets++; 3677126258Smlaier (*state)->nat_rule.ptr->bytes += pd->tot_len; 3678126258Smlaier } 3679126258Smlaier if ((*state)->anchor.ptr != NULL) { 3680126258Smlaier (*state)->anchor.ptr->packets++; 3681126258Smlaier (*state)->anchor.ptr->bytes += pd->tot_len; 3682126258Smlaier } 3683126258Smlaier return (PF_PASS); 3684126258Smlaier} 3685126258Smlaier 3686126258Smlaierint 3687126258Smlaierpf_test_state_udp(struct pf_state **state, int direction, struct ifnet *ifp, 3688126258Smlaier struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd) 3689126258Smlaier{ 3690126258Smlaier struct pf_state_peer *src, *dst; 3691126258Smlaier struct pf_tree_node key; 3692126258Smlaier struct udphdr *uh = pd->hdr.udp; 3693126258Smlaier int dirndx; 3694126258Smlaier 3695126258Smlaier key.af = pd->af; 3696126258Smlaier key.proto = IPPROTO_UDP; 3697126258Smlaier PF_ACPY(&key.addr[0], pd->src, key.af); 3698126258Smlaier PF_ACPY(&key.addr[1], pd->dst, key.af); 3699126258Smlaier key.port[0] = uh->uh_sport; 3700126258Smlaier key.port[1] = uh->uh_dport; 3701126258Smlaier 3702126258Smlaier STATE_LOOKUP(); 3703126258Smlaier 3704126258Smlaier if (direction == (*state)->direction) { 3705126258Smlaier src = &(*state)->src; 3706126258Smlaier dst = &(*state)->dst; 3707126258Smlaier dirndx = 0; 3708126258Smlaier } else { 3709126258Smlaier src = &(*state)->dst; 3710126258Smlaier dst = &(*state)->src; 3711126258Smlaier dirndx = 1; 3712126258Smlaier } 3713126258Smlaier 3714126258Smlaier (*state)->packets[dirndx]++; 3715126258Smlaier (*state)->bytes[dirndx] += pd->tot_len; 3716126258Smlaier 3717126258Smlaier /* update states */ 3718126258Smlaier if (src->state < PFUDPS_SINGLE) 3719126258Smlaier src->state = PFUDPS_SINGLE; 3720126258Smlaier if (dst->state == PFUDPS_SINGLE) 3721126258Smlaier dst->state = PFUDPS_MULTIPLE; 3722126258Smlaier 3723126258Smlaier /* update expire time */ 3724126258Smlaier (*state)->expire = time.tv_sec; 3725126258Smlaier if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 3726126258Smlaier (*state)->timeout = PFTM_UDP_MULTIPLE; 3727126258Smlaier else 3728126258Smlaier (*state)->timeout = PFTM_UDP_SINGLE; 3729126258Smlaier 3730126258Smlaier /* translate source/destination address, if necessary */ 3731126258Smlaier if (STATE_TRANSLATE(*state)) { 3732126258Smlaier if (direction == PF_OUT) 3733126258Smlaier pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 3734126258Smlaier &uh->uh_sum, &(*state)->gwy.addr, 3735126258Smlaier (*state)->gwy.port, 1, pd->af); 3736126258Smlaier else 3737126258Smlaier pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 3738126258Smlaier &uh->uh_sum, &(*state)->lan.addr, 3739126258Smlaier (*state)->lan.port, 1, pd->af); 3740126258Smlaier m_copyback(m, off, sizeof(*uh), uh); 3741126258Smlaier } 3742126258Smlaier 3743126258Smlaier (*state)->rule.ptr->packets++; 3744126258Smlaier (*state)->rule.ptr->bytes += pd->tot_len; 3745126258Smlaier if ((*state)->nat_rule.ptr != NULL) { 3746126258Smlaier (*state)->nat_rule.ptr->packets++; 3747126258Smlaier (*state)->nat_rule.ptr->bytes += pd->tot_len; 3748126258Smlaier } 3749126258Smlaier if ((*state)->anchor.ptr != NULL) { 3750126258Smlaier (*state)->anchor.ptr->packets++; 3751126258Smlaier (*state)->anchor.ptr->bytes += pd->tot_len; 3752126258Smlaier } 3753126258Smlaier return (PF_PASS); 3754126258Smlaier} 3755126258Smlaier 3756126258Smlaierint 3757126258Smlaierpf_test_state_icmp(struct pf_state **state, int direction, struct ifnet *ifp, 3758126258Smlaier struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd) 3759126258Smlaier{ 3760126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3761126258Smlaier u_int16_t icmpid, *icmpsum; 3762126258Smlaier u_int8_t icmptype; 3763126258Smlaier int state_icmp = 0, dirndx; 3764126258Smlaier 3765126258Smlaier switch (pd->proto) { 3766126258Smlaier#ifdef INET 3767126258Smlaier case IPPROTO_ICMP: 3768126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 3769126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 3770126258Smlaier icmpsum = &pd->hdr.icmp->icmp_cksum; 3771126258Smlaier 3772126258Smlaier if (icmptype == ICMP_UNREACH || 3773126258Smlaier icmptype == ICMP_SOURCEQUENCH || 3774126258Smlaier icmptype == ICMP_REDIRECT || 3775126258Smlaier icmptype == ICMP_TIMXCEED || 3776126258Smlaier icmptype == ICMP_PARAMPROB) 3777126258Smlaier state_icmp++; 3778126258Smlaier break; 3779126258Smlaier#endif /* INET */ 3780126258Smlaier#ifdef INET6 3781126258Smlaier case IPPROTO_ICMPV6: 3782126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 3783126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 3784126258Smlaier icmpsum = &pd->hdr.icmp6->icmp6_cksum; 3785126258Smlaier 3786126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 3787126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 3788126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 3789126258Smlaier icmptype == ICMP6_PARAM_PROB) 3790126258Smlaier state_icmp++; 3791126258Smlaier break; 3792126258Smlaier#endif /* INET6 */ 3793126258Smlaier } 3794126258Smlaier 3795126258Smlaier if (!state_icmp) { 3796126258Smlaier 3797126258Smlaier /* 3798126258Smlaier * ICMP query/reply message not related to a TCP/UDP packet. 3799126258Smlaier * Search for an ICMP state. 3800126258Smlaier */ 3801126258Smlaier struct pf_tree_node key; 3802126258Smlaier 3803126258Smlaier key.af = pd->af; 3804126258Smlaier key.proto = pd->proto; 3805126258Smlaier PF_ACPY(&key.addr[0], saddr, key.af); 3806126258Smlaier PF_ACPY(&key.addr[1], daddr, key.af); 3807126258Smlaier key.port[0] = icmpid; 3808126258Smlaier key.port[1] = icmpid; 3809126258Smlaier 3810126258Smlaier STATE_LOOKUP(); 3811126258Smlaier 3812126258Smlaier dirndx = (direction == (*state)->direction) ? 0 : 1; 3813126258Smlaier (*state)->packets[dirndx]++; 3814126258Smlaier (*state)->bytes[dirndx] += pd->tot_len; 3815126258Smlaier (*state)->expire = time.tv_sec; 3816126258Smlaier (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 3817126258Smlaier 3818126258Smlaier /* translate source/destination address, if necessary */ 3819126258Smlaier if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) { 3820126258Smlaier if (direction == PF_OUT) { 3821126258Smlaier switch (pd->af) { 3822126258Smlaier#ifdef INET 3823126258Smlaier case AF_INET: 3824126258Smlaier pf_change_a(&saddr->v4.s_addr, 3825126258Smlaier pd->ip_sum, 3826126258Smlaier (*state)->gwy.addr.v4.s_addr, 0); 3827126258Smlaier break; 3828126258Smlaier#endif /* INET */ 3829126258Smlaier#ifdef INET6 3830126258Smlaier case AF_INET6: 3831126258Smlaier pf_change_a6(saddr, 3832126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 3833126258Smlaier &(*state)->gwy.addr, 0); 3834126258Smlaier m_copyback(m, off, 3835126258Smlaier sizeof(struct icmp6_hdr), 3836126258Smlaier pd->hdr.icmp6); 3837126258Smlaier break; 3838126258Smlaier#endif /* INET6 */ 3839126258Smlaier } 3840126258Smlaier } else { 3841126258Smlaier switch (pd->af) { 3842126258Smlaier#ifdef INET 3843126258Smlaier case AF_INET: 3844126258Smlaier pf_change_a(&daddr->v4.s_addr, 3845126258Smlaier pd->ip_sum, 3846126258Smlaier (*state)->lan.addr.v4.s_addr, 0); 3847126258Smlaier break; 3848126258Smlaier#endif /* INET */ 3849126258Smlaier#ifdef INET6 3850126258Smlaier case AF_INET6: 3851126258Smlaier pf_change_a6(daddr, 3852126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 3853126258Smlaier &(*state)->lan.addr, 0); 3854126258Smlaier m_copyback(m, off, 3855126258Smlaier sizeof(struct icmp6_hdr), 3856126258Smlaier pd->hdr.icmp6); 3857126258Smlaier break; 3858126258Smlaier#endif /* INET6 */ 3859126258Smlaier } 3860126258Smlaier } 3861126258Smlaier } 3862126258Smlaier 3863126258Smlaier return (PF_PASS); 3864126258Smlaier 3865126258Smlaier } else { 3866126258Smlaier /* 3867126258Smlaier * ICMP error message in response to a TCP/UDP packet. 3868126258Smlaier * Extract the inner TCP/UDP header and search for that state. 3869126258Smlaier */ 3870126258Smlaier 3871126258Smlaier struct pf_pdesc pd2; 3872126258Smlaier#ifdef INET 3873126258Smlaier struct ip h2; 3874126258Smlaier#endif /* INET */ 3875126258Smlaier#ifdef INET6 3876126258Smlaier struct ip6_hdr h2_6; 3877126258Smlaier int terminal = 0; 3878126258Smlaier#endif /* INET6 */ 3879126258Smlaier int ipoff2; 3880126258Smlaier int off2; 3881126258Smlaier 3882126258Smlaier pd2.af = pd->af; 3883126258Smlaier switch (pd->af) { 3884126258Smlaier#ifdef INET 3885126258Smlaier case AF_INET: 3886126258Smlaier /* offset of h2 in mbuf chain */ 3887126258Smlaier ipoff2 = off + ICMP_MINLEN; 3888126258Smlaier 3889126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 3890126258Smlaier NULL, NULL, pd2.af)) { 3891126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 3892126258Smlaier ("pf: ICMP error message too short " 3893126258Smlaier "(ip)\n")); 3894126258Smlaier return (PF_DROP); 3895126258Smlaier } 3896126258Smlaier /* 3897126258Smlaier * ICMP error messages don't refer to non-first 3898126258Smlaier * fragments 3899126258Smlaier */ 3900126258Smlaier if (h2.ip_off & htons(IP_OFFMASK)) 3901126258Smlaier return (PF_DROP); 3902126258Smlaier 3903126258Smlaier /* offset of protocol header that follows h2 */ 3904126258Smlaier off2 = ipoff2 + (h2.ip_hl << 2); 3905126258Smlaier 3906126258Smlaier pd2.proto = h2.ip_p; 3907126258Smlaier pd2.src = (struct pf_addr *)&h2.ip_src; 3908126258Smlaier pd2.dst = (struct pf_addr *)&h2.ip_dst; 3909126258Smlaier pd2.ip_sum = &h2.ip_sum; 3910126258Smlaier break; 3911126258Smlaier#endif /* INET */ 3912126258Smlaier#ifdef INET6 3913126258Smlaier case AF_INET6: 3914126258Smlaier ipoff2 = off + sizeof(struct icmp6_hdr); 3915126258Smlaier 3916126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 3917126258Smlaier NULL, NULL, pd2.af)) { 3918126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 3919126258Smlaier ("pf: ICMP error message too short " 3920126258Smlaier "(ip6)\n")); 3921126258Smlaier return (PF_DROP); 3922126258Smlaier } 3923126258Smlaier pd2.proto = h2_6.ip6_nxt; 3924126258Smlaier pd2.src = (struct pf_addr *)&h2_6.ip6_src; 3925126258Smlaier pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 3926126258Smlaier pd2.ip_sum = NULL; 3927126258Smlaier off2 = ipoff2 + sizeof(h2_6); 3928126258Smlaier do { 3929126258Smlaier switch (pd2.proto) { 3930126258Smlaier case IPPROTO_FRAGMENT: 3931126258Smlaier /* 3932126258Smlaier * ICMPv6 error messages for 3933126258Smlaier * non-first fragments 3934126258Smlaier */ 3935126258Smlaier return (PF_DROP); 3936126258Smlaier case IPPROTO_AH: 3937126258Smlaier case IPPROTO_HOPOPTS: 3938126258Smlaier case IPPROTO_ROUTING: 3939126258Smlaier case IPPROTO_DSTOPTS: { 3940126258Smlaier /* get next header and header length */ 3941126258Smlaier struct ip6_ext opt6; 3942126258Smlaier 3943126258Smlaier if (!pf_pull_hdr(m, off2, &opt6, 3944126258Smlaier sizeof(opt6), NULL, NULL, pd2.af)) { 3945126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 3946126258Smlaier ("pf: ICMPv6 short opt\n")); 3947126258Smlaier return (PF_DROP); 3948126258Smlaier } 3949126258Smlaier if (pd2.proto == IPPROTO_AH) 3950126258Smlaier off2 += (opt6.ip6e_len + 2) * 4; 3951126258Smlaier else 3952126258Smlaier off2 += (opt6.ip6e_len + 1) * 8; 3953126258Smlaier pd2.proto = opt6.ip6e_nxt; 3954126258Smlaier /* goto the next header */ 3955126258Smlaier break; 3956126258Smlaier } 3957126258Smlaier default: 3958126258Smlaier terminal++; 3959126258Smlaier break; 3960126258Smlaier } 3961126258Smlaier } while (!terminal); 3962126258Smlaier break; 3963126258Smlaier#endif /* INET6 */ 3964126258Smlaier } 3965126258Smlaier 3966126258Smlaier switch (pd2.proto) { 3967126258Smlaier case IPPROTO_TCP: { 3968126258Smlaier struct tcphdr th; 3969126258Smlaier u_int32_t seq; 3970126258Smlaier struct pf_tree_node key; 3971126258Smlaier struct pf_state_peer *src, *dst; 3972126258Smlaier u_int8_t dws; 3973126258Smlaier 3974126258Smlaier /* 3975126258Smlaier * Only the first 8 bytes of the TCP header can be 3976126258Smlaier * expected. Don't access any TCP header fields after 3977126258Smlaier * th_seq, an ackskew test is not possible. 3978126258Smlaier */ 3979126258Smlaier if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) { 3980126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 3981126258Smlaier ("pf: ICMP error message too short " 3982126258Smlaier "(tcp)\n")); 3983126258Smlaier return (PF_DROP); 3984126258Smlaier } 3985126258Smlaier 3986126258Smlaier key.af = pd2.af; 3987126258Smlaier key.proto = IPPROTO_TCP; 3988126258Smlaier PF_ACPY(&key.addr[0], pd2.dst, pd2.af); 3989126258Smlaier key.port[0] = th.th_dport; 3990126258Smlaier PF_ACPY(&key.addr[1], pd2.src, pd2.af); 3991126258Smlaier key.port[1] = th.th_sport; 3992126258Smlaier 3993126258Smlaier STATE_LOOKUP(); 3994126258Smlaier 3995126258Smlaier if (direction == (*state)->direction) { 3996126258Smlaier src = &(*state)->dst; 3997126258Smlaier dst = &(*state)->src; 3998126258Smlaier } else { 3999126258Smlaier src = &(*state)->src; 4000126258Smlaier dst = &(*state)->dst; 4001126258Smlaier } 4002126258Smlaier 4003126258Smlaier if (src->wscale && dst->wscale && !(th.th_flags & TH_SYN)) 4004126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4005126258Smlaier else 4006126258Smlaier dws = 0; 4007126258Smlaier 4008126258Smlaier /* Demodulate sequence number */ 4009126258Smlaier seq = ntohl(th.th_seq) - src->seqdiff; 4010126258Smlaier if (src->seqdiff) 4011126258Smlaier pf_change_a(&th.th_seq, &th.th_sum, 4012126258Smlaier htonl(seq), 0); 4013126258Smlaier 4014126258Smlaier if (!SEQ_GEQ(src->seqhi, seq) || 4015126258Smlaier !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 4016126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 4017126258Smlaier printf("pf: BAD ICMP %d:%d ", 4018126258Smlaier icmptype, pd->hdr.icmp->icmp_code); 4019126258Smlaier pf_print_host(pd->src, 0, pd->af); 4020126258Smlaier printf(" -> "); 4021126258Smlaier pf_print_host(pd->dst, 0, pd->af); 4022126258Smlaier printf(" state: "); 4023126258Smlaier pf_print_state(*state); 4024126258Smlaier printf(" seq=%u\n", seq); 4025126258Smlaier } 4026126258Smlaier return (PF_DROP); 4027126258Smlaier } 4028126258Smlaier 4029126258Smlaier if (STATE_TRANSLATE(*state)) { 4030126258Smlaier if (direction == PF_IN) { 4031126258Smlaier pf_change_icmp(pd2.src, &th.th_sport, 4032126258Smlaier saddr, &(*state)->lan.addr, 4033126258Smlaier (*state)->lan.port, NULL, 4034126258Smlaier pd2.ip_sum, icmpsum, 4035126258Smlaier pd->ip_sum, 0, pd2.af); 4036126258Smlaier } else { 4037126258Smlaier pf_change_icmp(pd2.dst, &th.th_dport, 4038126258Smlaier saddr, &(*state)->gwy.addr, 4039126258Smlaier (*state)->gwy.port, NULL, 4040126258Smlaier pd2.ip_sum, icmpsum, 4041126258Smlaier pd->ip_sum, 0, pd2.af); 4042126258Smlaier } 4043126258Smlaier switch (pd2.af) { 4044126258Smlaier#ifdef INET 4045126258Smlaier case AF_INET: 4046126258Smlaier m_copyback(m, off, ICMP_MINLEN, 4047126258Smlaier pd->hdr.icmp); 4048126258Smlaier m_copyback(m, ipoff2, sizeof(h2), 4049126258Smlaier &h2); 4050126258Smlaier break; 4051126258Smlaier#endif /* INET */ 4052126258Smlaier#ifdef INET6 4053126258Smlaier case AF_INET6: 4054126258Smlaier m_copyback(m, off, 4055126258Smlaier sizeof(struct icmp6_hdr), 4056126258Smlaier pd->hdr.icmp6); 4057126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 4058126258Smlaier &h2_6); 4059126258Smlaier break; 4060126258Smlaier#endif /* INET6 */ 4061126258Smlaier } 4062126258Smlaier m_copyback(m, off2, 8, &th); 4063126258Smlaier } else if (src->seqdiff) { 4064126258Smlaier m_copyback(m, off2, 8, &th); 4065126258Smlaier } 4066126258Smlaier 4067126258Smlaier return (PF_PASS); 4068126258Smlaier break; 4069126258Smlaier } 4070126258Smlaier case IPPROTO_UDP: { 4071126258Smlaier struct udphdr uh; 4072126258Smlaier struct pf_tree_node key; 4073126258Smlaier 4074126258Smlaier if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4075126258Smlaier NULL, NULL, pd2.af)) { 4076126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 4077126258Smlaier ("pf: ICMP error message too short " 4078126258Smlaier "(udp)\n")); 4079126258Smlaier return (PF_DROP); 4080126258Smlaier } 4081126258Smlaier 4082126258Smlaier key.af = pd2.af; 4083126258Smlaier key.proto = IPPROTO_UDP; 4084126258Smlaier PF_ACPY(&key.addr[0], pd2.dst, pd2.af); 4085126258Smlaier key.port[0] = uh.uh_dport; 4086126258Smlaier PF_ACPY(&key.addr[1], pd2.src, pd2.af); 4087126258Smlaier key.port[1] = uh.uh_sport; 4088126258Smlaier 4089126258Smlaier STATE_LOOKUP(); 4090126258Smlaier 4091126258Smlaier if (STATE_TRANSLATE(*state)) { 4092126258Smlaier if (direction == PF_IN) { 4093126258Smlaier pf_change_icmp(pd2.src, &uh.uh_sport, 4094126258Smlaier daddr, &(*state)->lan.addr, 4095126258Smlaier (*state)->lan.port, &uh.uh_sum, 4096126258Smlaier pd2.ip_sum, icmpsum, 4097126258Smlaier pd->ip_sum, 1, pd2.af); 4098126258Smlaier } else { 4099126258Smlaier pf_change_icmp(pd2.dst, &uh.uh_dport, 4100126258Smlaier saddr, &(*state)->gwy.addr, 4101126258Smlaier (*state)->gwy.port, &uh.uh_sum, 4102126258Smlaier pd2.ip_sum, icmpsum, 4103126258Smlaier pd->ip_sum, 1, pd2.af); 4104126258Smlaier } 4105126258Smlaier switch (pd2.af) { 4106126258Smlaier#ifdef INET 4107126258Smlaier case AF_INET: 4108126258Smlaier m_copyback(m, off, ICMP_MINLEN, 4109126258Smlaier pd->hdr.icmp); 4110126258Smlaier m_copyback(m, ipoff2, sizeof(h2), &h2); 4111126258Smlaier break; 4112126258Smlaier#endif /* INET */ 4113126258Smlaier#ifdef INET6 4114126258Smlaier case AF_INET6: 4115126258Smlaier m_copyback(m, off, 4116126258Smlaier sizeof(struct icmp6_hdr), 4117126258Smlaier pd->hdr.icmp6); 4118126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 4119126258Smlaier &h2_6); 4120126258Smlaier break; 4121126258Smlaier#endif /* INET6 */ 4122126258Smlaier } 4123126258Smlaier m_copyback(m, off2, sizeof(uh), &uh); 4124126258Smlaier } 4125126258Smlaier 4126126258Smlaier return (PF_PASS); 4127126258Smlaier break; 4128126258Smlaier } 4129126258Smlaier#ifdef INET 4130126258Smlaier case IPPROTO_ICMP: { 4131126258Smlaier struct icmp iih; 4132126258Smlaier struct pf_tree_node key; 4133126258Smlaier 4134126258Smlaier if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4135126258Smlaier NULL, NULL, pd2.af)) { 4136126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 4137126258Smlaier ("pf: ICMP error message too short i" 4138126258Smlaier "(icmp)\n")); 4139126258Smlaier return (PF_DROP); 4140126258Smlaier } 4141126258Smlaier 4142126258Smlaier key.af = pd2.af; 4143126258Smlaier key.proto = IPPROTO_ICMP; 4144126258Smlaier PF_ACPY(&key.addr[0], pd2.dst, pd2.af); 4145126258Smlaier key.port[0] = iih.icmp_id; 4146126258Smlaier PF_ACPY(&key.addr[1], pd2.src, pd2.af); 4147126258Smlaier key.port[1] = iih.icmp_id; 4148126258Smlaier 4149126258Smlaier STATE_LOOKUP(); 4150126258Smlaier 4151126258Smlaier if (STATE_TRANSLATE(*state)) { 4152126258Smlaier if (direction == PF_IN) { 4153126258Smlaier pf_change_icmp(pd2.src, &iih.icmp_id, 4154126258Smlaier daddr, &(*state)->lan.addr, 4155126258Smlaier (*state)->lan.port, NULL, 4156126258Smlaier pd2.ip_sum, icmpsum, 4157126258Smlaier pd->ip_sum, 0, AF_INET); 4158126258Smlaier } else { 4159126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp_id, 4160126258Smlaier saddr, &(*state)->gwy.addr, 4161126258Smlaier (*state)->gwy.port, NULL, 4162126258Smlaier pd2.ip_sum, icmpsum, 4163126258Smlaier pd->ip_sum, 0, AF_INET); 4164126258Smlaier } 4165126258Smlaier m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 4166126258Smlaier m_copyback(m, ipoff2, sizeof(h2), &h2); 4167126258Smlaier m_copyback(m, off2, ICMP_MINLEN, &iih); 4168126258Smlaier } 4169126258Smlaier 4170126258Smlaier return (PF_PASS); 4171126258Smlaier break; 4172126258Smlaier } 4173126258Smlaier#endif /* INET */ 4174126258Smlaier#ifdef INET6 4175126258Smlaier case IPPROTO_ICMPV6: { 4176126258Smlaier struct icmp6_hdr iih; 4177126258Smlaier struct pf_tree_node key; 4178126258Smlaier 4179126258Smlaier if (!pf_pull_hdr(m, off2, &iih, 4180126258Smlaier sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) { 4181126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 4182126258Smlaier ("pf: ICMP error message too short " 4183126258Smlaier "(icmp6)\n")); 4184126258Smlaier return (PF_DROP); 4185126258Smlaier } 4186126258Smlaier 4187126258Smlaier key.af = pd2.af; 4188126258Smlaier key.proto = IPPROTO_ICMPV6; 4189126258Smlaier PF_ACPY(&key.addr[0], pd2.dst, pd2.af); 4190126258Smlaier key.port[0] = iih.icmp6_id; 4191126258Smlaier PF_ACPY(&key.addr[1], pd2.src, pd2.af); 4192126258Smlaier key.port[1] = iih.icmp6_id; 4193126258Smlaier 4194126258Smlaier STATE_LOOKUP(); 4195126258Smlaier 4196126258Smlaier if (STATE_TRANSLATE(*state)) { 4197126258Smlaier if (direction == PF_IN) { 4198126258Smlaier pf_change_icmp(pd2.src, &iih.icmp6_id, 4199126258Smlaier daddr, &(*state)->lan.addr, 4200126258Smlaier (*state)->lan.port, NULL, 4201126258Smlaier pd2.ip_sum, icmpsum, 4202126258Smlaier pd->ip_sum, 0, AF_INET6); 4203126258Smlaier } else { 4204126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp6_id, 4205126258Smlaier saddr, &(*state)->gwy.addr, 4206126258Smlaier (*state)->gwy.port, NULL, 4207126258Smlaier pd2.ip_sum, icmpsum, 4208126258Smlaier pd->ip_sum, 0, AF_INET6); 4209126258Smlaier } 4210126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 4211126258Smlaier pd->hdr.icmp6); 4212126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), &h2_6); 4213126258Smlaier m_copyback(m, off2, sizeof(struct icmp6_hdr), 4214126258Smlaier &iih); 4215126258Smlaier } 4216126258Smlaier 4217126258Smlaier return (PF_PASS); 4218126258Smlaier break; 4219126258Smlaier } 4220126258Smlaier#endif /* INET6 */ 4221126258Smlaier default: { 4222126258Smlaier struct pf_tree_node key; 4223126258Smlaier 4224126258Smlaier key.af = pd2.af; 4225126258Smlaier key.proto = pd2.proto; 4226126258Smlaier PF_ACPY(&key.addr[0], pd2.dst, pd2.af); 4227126258Smlaier key.port[0] = 0; 4228126258Smlaier PF_ACPY(&key.addr[1], pd2.src, pd2.af); 4229126258Smlaier key.port[1] = 0; 4230126258Smlaier 4231126258Smlaier STATE_LOOKUP(); 4232126258Smlaier 4233126258Smlaier if (STATE_TRANSLATE(*state)) { 4234126258Smlaier if (direction == PF_IN) { 4235126258Smlaier pf_change_icmp(pd2.src, NULL, 4236126258Smlaier daddr, &(*state)->lan.addr, 4237126258Smlaier 0, NULL, 4238126258Smlaier pd2.ip_sum, icmpsum, 4239126258Smlaier pd->ip_sum, 0, pd2.af); 4240126258Smlaier } else { 4241126258Smlaier pf_change_icmp(pd2.dst, NULL, 4242126258Smlaier saddr, &(*state)->gwy.addr, 4243126258Smlaier 0, NULL, 4244126258Smlaier pd2.ip_sum, icmpsum, 4245126258Smlaier pd->ip_sum, 0, pd2.af); 4246126258Smlaier } 4247126258Smlaier switch (pd2.af) { 4248126258Smlaier#ifdef INET 4249126258Smlaier case AF_INET: 4250126258Smlaier m_copyback(m, off, ICMP_MINLEN, 4251126258Smlaier pd->hdr.icmp); 4252126258Smlaier m_copyback(m, ipoff2, sizeof(h2), &h2); 4253126258Smlaier break; 4254126258Smlaier#endif /* INET */ 4255126258Smlaier#ifdef INET6 4256126258Smlaier case AF_INET6: 4257126258Smlaier m_copyback(m, off, 4258126258Smlaier sizeof(struct icmp6_hdr), 4259126258Smlaier pd->hdr.icmp6); 4260126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 4261126258Smlaier &h2_6); 4262126258Smlaier break; 4263126258Smlaier#endif /* INET6 */ 4264126258Smlaier } 4265126258Smlaier } 4266126258Smlaier 4267126258Smlaier return (PF_PASS); 4268126258Smlaier break; 4269126258Smlaier } 4270126258Smlaier } 4271126258Smlaier } 4272126258Smlaier} 4273126258Smlaier 4274126258Smlaierint 4275126258Smlaierpf_test_state_other(struct pf_state **state, int direction, struct ifnet *ifp, 4276126258Smlaier struct pf_pdesc *pd) 4277126258Smlaier{ 4278126258Smlaier struct pf_state_peer *src, *dst; 4279126258Smlaier struct pf_tree_node key; 4280126258Smlaier int dirndx; 4281126258Smlaier 4282126258Smlaier key.af = pd->af; 4283126258Smlaier key.proto = pd->proto; 4284126258Smlaier PF_ACPY(&key.addr[0], pd->src, key.af); 4285126258Smlaier PF_ACPY(&key.addr[1], pd->dst, key.af); 4286126258Smlaier key.port[0] = 0; 4287126258Smlaier key.port[1] = 0; 4288126258Smlaier 4289126258Smlaier STATE_LOOKUP(); 4290126258Smlaier 4291126258Smlaier if (direction == (*state)->direction) { 4292126258Smlaier src = &(*state)->src; 4293126258Smlaier dst = &(*state)->dst; 4294126258Smlaier dirndx = 0; 4295126258Smlaier } else { 4296126258Smlaier src = &(*state)->dst; 4297126258Smlaier dst = &(*state)->src; 4298126258Smlaier dirndx = 1; 4299126258Smlaier } 4300126258Smlaier 4301126258Smlaier (*state)->packets[dirndx]++; 4302126258Smlaier (*state)->bytes[dirndx] += pd->tot_len; 4303126258Smlaier 4304126258Smlaier /* update states */ 4305126258Smlaier if (src->state < PFOTHERS_SINGLE) 4306126258Smlaier src->state = PFOTHERS_SINGLE; 4307126258Smlaier if (dst->state == PFOTHERS_SINGLE) 4308126258Smlaier dst->state = PFOTHERS_MULTIPLE; 4309126258Smlaier 4310126258Smlaier /* update expire time */ 4311126258Smlaier (*state)->expire = time.tv_sec; 4312126258Smlaier if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4313126258Smlaier (*state)->timeout = PFTM_OTHER_MULTIPLE; 4314126258Smlaier else 4315126258Smlaier (*state)->timeout = PFTM_OTHER_SINGLE; 4316126258Smlaier 4317126258Smlaier /* translate source/destination address, if necessary */ 4318126258Smlaier if (STATE_TRANSLATE(*state)) { 4319126258Smlaier if (direction == PF_OUT) 4320126258Smlaier switch (pd->af) { 4321126258Smlaier#ifdef INET 4322126258Smlaier case AF_INET: 4323126258Smlaier pf_change_a(&pd->src->v4.s_addr, 4324126258Smlaier pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 4325126258Smlaier 0); 4326126258Smlaier break; 4327126258Smlaier#endif /* INET */ 4328126258Smlaier#ifdef INET6 4329126258Smlaier case AF_INET6: 4330126258Smlaier PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 4331126258Smlaier break; 4332126258Smlaier#endif /* INET6 */ 4333126258Smlaier } 4334126258Smlaier else 4335126258Smlaier switch (pd->af) { 4336126258Smlaier#ifdef INET 4337126258Smlaier case AF_INET: 4338126258Smlaier pf_change_a(&pd->dst->v4.s_addr, 4339126258Smlaier pd->ip_sum, (*state)->lan.addr.v4.s_addr, 4340126258Smlaier 0); 4341126258Smlaier break; 4342126258Smlaier#endif /* INET */ 4343126258Smlaier#ifdef INET6 4344126258Smlaier case AF_INET6: 4345126258Smlaier PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 4346126258Smlaier break; 4347126258Smlaier#endif /* INET6 */ 4348126258Smlaier } 4349126258Smlaier } 4350126258Smlaier 4351126258Smlaier (*state)->rule.ptr->packets++; 4352126258Smlaier (*state)->rule.ptr->bytes += pd->tot_len; 4353126258Smlaier if ((*state)->nat_rule.ptr != NULL) { 4354126258Smlaier (*state)->nat_rule.ptr->packets++; 4355126258Smlaier (*state)->nat_rule.ptr->bytes += pd->tot_len; 4356126258Smlaier } 4357126258Smlaier if ((*state)->anchor.ptr != NULL) { 4358126258Smlaier (*state)->anchor.ptr->packets++; 4359126258Smlaier (*state)->anchor.ptr->bytes += pd->tot_len; 4360126258Smlaier } 4361126258Smlaier return (PF_PASS); 4362126258Smlaier} 4363126258Smlaier 4364126258Smlaier/* 4365126258Smlaier * ipoff and off are measured from the start of the mbuf chain. 4366126258Smlaier * h must be at "ipoff" on the mbuf chain. 4367126258Smlaier */ 4368126258Smlaiervoid * 4369126258Smlaierpf_pull_hdr(struct mbuf *m, int off, void *p, int len, 4370126258Smlaier u_short *actionp, u_short *reasonp, sa_family_t af) 4371126258Smlaier{ 4372126258Smlaier switch (af) { 4373126258Smlaier#ifdef INET 4374126258Smlaier case AF_INET: { 4375126258Smlaier struct ip *h = mtod(m, struct ip *); 4376126258Smlaier u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 4377126258Smlaier 4378126258Smlaier if (fragoff) { 4379126258Smlaier if (fragoff >= len) 4380126258Smlaier ACTION_SET(actionp, PF_PASS); 4381126258Smlaier else { 4382126258Smlaier ACTION_SET(actionp, PF_DROP); 4383126258Smlaier REASON_SET(reasonp, PFRES_FRAG); 4384126258Smlaier } 4385126258Smlaier return (NULL); 4386126258Smlaier } 4387126258Smlaier if (m->m_pkthdr.len < off + len || ntohs(h->ip_len) < off + len) { 4388126258Smlaier ACTION_SET(actionp, PF_DROP); 4389126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 4390126258Smlaier return (NULL); 4391126258Smlaier } 4392126258Smlaier break; 4393126258Smlaier } 4394126258Smlaier#endif /* INET */ 4395126258Smlaier#ifdef INET6 4396126258Smlaier case AF_INET6: { 4397126258Smlaier struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 4398126258Smlaier 4399126258Smlaier if (m->m_pkthdr.len < off + len || 4400126258Smlaier (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 4401126258Smlaier (unsigned)(off + len)) { 4402126258Smlaier ACTION_SET(actionp, PF_DROP); 4403126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 4404126258Smlaier return (NULL); 4405126258Smlaier } 4406126258Smlaier break; 4407126258Smlaier } 4408126258Smlaier#endif /* INET6 */ 4409126258Smlaier } 4410126258Smlaier m_copydata(m, off, len, p); 4411126258Smlaier return (p); 4412126258Smlaier} 4413126258Smlaier 4414126258Smlaierint 4415126258Smlaierpf_routable(struct pf_addr *addr, sa_family_t af) 4416126258Smlaier{ 4417126258Smlaier struct sockaddr_in *dst; 4418126258Smlaier struct route ro; 4419126258Smlaier int ret = 0; 4420126258Smlaier 4421126258Smlaier bzero(&ro, sizeof(ro)); 4422126258Smlaier dst = satosin(&ro.ro_dst); 4423126258Smlaier dst->sin_family = af; 4424126258Smlaier dst->sin_len = sizeof(*dst); 4425126258Smlaier dst->sin_addr = addr->v4; 4426126258Smlaier rtalloc_noclone(&ro, NO_CLONING); 4427126258Smlaier 4428126258Smlaier if (ro.ro_rt != NULL) { 4429126258Smlaier ret = 1; 4430126258Smlaier RTFREE(ro.ro_rt); 4431126258Smlaier } 4432126258Smlaier 4433126258Smlaier return (ret); 4434126258Smlaier} 4435126258Smlaier 4436126258Smlaier#ifdef INET 4437126258Smlaiervoid 4438126258Smlaierpf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 4439126258Smlaier struct pf_state *s) 4440126258Smlaier{ 4441126258Smlaier struct mbuf *m0, *m1; 4442126258Smlaier struct route iproute; 4443126258Smlaier struct route *ro; 4444126258Smlaier struct sockaddr_in *dst; 4445126258Smlaier struct ip *ip; 4446126258Smlaier struct ifnet *ifp = NULL; 4447126258Smlaier struct m_tag *mtag; 4448126258Smlaier struct pf_addr naddr; 4449126258Smlaier int error = 0; 4450126258Smlaier 4451126258Smlaier if (m == NULL || *m == NULL || r == NULL || 4452126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 4453126258Smlaier panic("pf_route: invalid parameters"); 4454126258Smlaier 4455126258Smlaier if (r->rt == PF_DUPTO) { 4456126258Smlaier m0 = *m; 4457126258Smlaier mtag = m_tag_find(m0, PACKET_TAG_PF_ROUTED, NULL); 4458126258Smlaier if (mtag == NULL) { 4459126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 0, M_NOWAIT); 4460126258Smlaier if (mtag == NULL) 4461126258Smlaier goto bad; 4462126258Smlaier m_tag_prepend(m0, mtag); 4463126258Smlaier } 4464126258Smlaier m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT); 4465126258Smlaier if (m0 == NULL) 4466126258Smlaier return; 4467126258Smlaier } else { 4468126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 4469126258Smlaier return; 4470126258Smlaier m0 = *m; 4471126258Smlaier } 4472126258Smlaier 4473126258Smlaier if (m0->m_len < sizeof(struct ip)) 4474126258Smlaier panic("pf_route: m0->m_len < sizeof(struct ip)"); 4475126258Smlaier ip = mtod(m0, struct ip *); 4476126258Smlaier 4477126258Smlaier ro = &iproute; 4478126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 4479126258Smlaier dst = satosin(&ro->ro_dst); 4480126258Smlaier dst->sin_family = AF_INET; 4481126258Smlaier dst->sin_len = sizeof(*dst); 4482126258Smlaier dst->sin_addr = ip->ip_dst; 4483126258Smlaier 4484126258Smlaier if (r->rt == PF_FASTROUTE) { 4485126258Smlaier rtalloc(ro); 4486126258Smlaier if (ro->ro_rt == 0) { 4487126258Smlaier ipstat.ips_noroute++; 4488126258Smlaier goto bad; 4489126258Smlaier } 4490126258Smlaier 4491126258Smlaier ifp = ro->ro_rt->rt_ifp; 4492126258Smlaier ro->ro_rt->rt_use++; 4493126258Smlaier 4494126258Smlaier if (ro->ro_rt->rt_flags & RTF_GATEWAY) 4495126258Smlaier dst = satosin(ro->ro_rt->rt_gateway); 4496126258Smlaier } else { 4497126258Smlaier if (TAILQ_EMPTY(&r->rpool.list)) 4498126258Smlaier panic("pf_route: TAILQ_EMPTY(&r->rpool.list)"); 4499126258Smlaier if (s == NULL) { 4500126258Smlaier pf_map_addr(AF_INET, &r->rpool, 4501126258Smlaier (struct pf_addr *)&ip->ip_src, 4502126258Smlaier &naddr, NULL); 4503126258Smlaier if (!PF_AZERO(&naddr, AF_INET)) 4504126258Smlaier dst->sin_addr.s_addr = naddr.v4.s_addr; 4505126258Smlaier ifp = r->rpool.cur->ifp; 4506126258Smlaier } else { 4507126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET)) 4508126258Smlaier dst->sin_addr.s_addr = 4509126258Smlaier s->rt_addr.v4.s_addr; 4510126258Smlaier ifp = s->rt_ifp; 4511126258Smlaier } 4512126258Smlaier } 4513126258Smlaier 4514126258Smlaier if (ifp == NULL) 4515126258Smlaier goto bad; 4516126258Smlaier 4517126258Smlaier mtag = m_tag_find(m0, PACKET_TAG_PF_ROUTED, NULL); 4518126258Smlaier if (mtag == NULL) { 4519126258Smlaier struct m_tag *mtag; 4520126258Smlaier 4521126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 0, M_NOWAIT); 4522126258Smlaier if (mtag == NULL) 4523126258Smlaier goto bad; 4524126258Smlaier m_tag_prepend(m0, mtag); 4525126258Smlaier } 4526126258Smlaier 4527126258Smlaier if (oifp != ifp && mtag == NULL) { 4528126258Smlaier if (pf_test(PF_OUT, ifp, &m0) != PF_PASS) 4529126258Smlaier goto bad; 4530126258Smlaier else if (m0 == NULL) 4531126258Smlaier goto done; 4532126258Smlaier if (m0->m_len < sizeof(struct ip)) 4533126258Smlaier panic("pf_route: m0->m_len < sizeof(struct ip)"); 4534126258Smlaier ip = mtod(m0, struct ip *); 4535126258Smlaier } 4536126258Smlaier 4537126258Smlaier /* Copied from ip_output. */ 4538126258Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu) { 4539126258Smlaier if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 4540126258Smlaier ifp->if_bridge == NULL) { 4541126258Smlaier m0->m_pkthdr.csum |= M_IPV4_CSUM_OUT; 4542126258Smlaier ipstat.ips_outhwcsum++; 4543126258Smlaier } else { 4544126258Smlaier ip->ip_sum = 0; 4545126258Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 4546126258Smlaier } 4547126258Smlaier /* Update relevant hardware checksum stats for TCP/UDP */ 4548126258Smlaier if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT) 4549126258Smlaier tcpstat.tcps_outhwcsum++; 4550126258Smlaier else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT) 4551126258Smlaier udpstat.udps_outhwcsum++; 4552126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 4553126258Smlaier goto done; 4554126258Smlaier } 4555126258Smlaier 4556126258Smlaier /* 4557126258Smlaier * Too large for interface; fragment if possible. 4558126258Smlaier * Must be able to put at least 8 bytes per fragment. 4559126258Smlaier */ 4560126258Smlaier if (ip->ip_off & htons(IP_DF)) { 4561126258Smlaier ipstat.ips_cantfrag++; 4562126258Smlaier if (r->rt != PF_DUPTO) { 4563126258Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 4564126258Smlaier ifp); 4565126258Smlaier goto done; 4566126258Smlaier } else 4567126258Smlaier goto bad; 4568126258Smlaier } 4569126258Smlaier 4570126258Smlaier m1 = m0; 4571126258Smlaier error = ip_fragment(m0, ifp, ifp->if_mtu); 4572126258Smlaier if (error == EMSGSIZE) 4573126258Smlaier goto bad; 4574126258Smlaier 4575126258Smlaier for (m0 = m1; m0; m0 = m1) { 4576126258Smlaier m1 = m0->m_nextpkt; 4577126258Smlaier m0->m_nextpkt = 0; 4578126258Smlaier if (error == 0) 4579126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 4580126258Smlaier NULL); 4581126258Smlaier else 4582126258Smlaier m_freem(m0); 4583126258Smlaier } 4584126258Smlaier 4585126258Smlaier if (error == 0) 4586126258Smlaier ipstat.ips_fragmented++; 4587126258Smlaier 4588126258Smlaierdone: 4589126258Smlaier if (r->rt != PF_DUPTO) 4590126258Smlaier *m = NULL; 4591126258Smlaier if (ro == &iproute && ro->ro_rt) 4592126258Smlaier RTFREE(ro->ro_rt); 4593126258Smlaier return; 4594126258Smlaier 4595126258Smlaierbad: 4596126258Smlaier m_freem(m0); 4597126258Smlaier goto done; 4598126258Smlaier} 4599126258Smlaier#endif /* INET */ 4600126258Smlaier 4601126258Smlaier#ifdef INET6 4602126258Smlaiervoid 4603126258Smlaierpf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 4604126258Smlaier struct pf_state *s) 4605126258Smlaier{ 4606126258Smlaier struct mbuf *m0; 4607126258Smlaier struct m_tag *mtag; 4608126258Smlaier struct route_in6 ip6route; 4609126258Smlaier struct route_in6 *ro; 4610126258Smlaier struct sockaddr_in6 *dst; 4611126258Smlaier struct ip6_hdr *ip6; 4612126258Smlaier struct ifnet *ifp = NULL; 4613126258Smlaier struct pf_addr naddr; 4614126258Smlaier int error = 0; 4615126258Smlaier 4616126258Smlaier if (m == NULL || *m == NULL || r == NULL || 4617126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 4618126258Smlaier panic("pf_route6: invalid parameters"); 4619126258Smlaier 4620126258Smlaier if (r->rt == PF_DUPTO) { 4621126258Smlaier m0 = *m; 4622126258Smlaier mtag = m_tag_find(m0, PACKET_TAG_PF_ROUTED, NULL); 4623126258Smlaier if (mtag == NULL) { 4624126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 0, M_NOWAIT); 4625126258Smlaier if (mtag == NULL) 4626126258Smlaier goto bad; 4627126258Smlaier m_tag_prepend(m0, mtag); 4628126258Smlaier } 4629126258Smlaier m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT); 4630126258Smlaier if (m0 == NULL) 4631126258Smlaier return; 4632126258Smlaier } else { 4633126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 4634126258Smlaier return; 4635126258Smlaier m0 = *m; 4636126258Smlaier } 4637126258Smlaier 4638126258Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) 4639126258Smlaier panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)"); 4640126258Smlaier ip6 = mtod(m0, struct ip6_hdr *); 4641126258Smlaier 4642126258Smlaier ro = &ip6route; 4643126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 4644126258Smlaier dst = (struct sockaddr_in6 *)&ro->ro_dst; 4645126258Smlaier dst->sin6_family = AF_INET6; 4646126258Smlaier dst->sin6_len = sizeof(*dst); 4647126258Smlaier dst->sin6_addr = ip6->ip6_dst; 4648126258Smlaier 4649126258Smlaier /* Cheat. */ 4650126258Smlaier if (r->rt == PF_FASTROUTE) { 4651126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 4652126258Smlaier if (mtag == NULL) 4653126258Smlaier goto bad; 4654126258Smlaier m_tag_prepend(m0, mtag); 4655126258Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL); 4656126258Smlaier return; 4657126258Smlaier } 4658126258Smlaier 4659126258Smlaier if (TAILQ_EMPTY(&r->rpool.list)) 4660126258Smlaier panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)"); 4661126258Smlaier if (s == NULL) { 4662126258Smlaier pf_map_addr(AF_INET6, &r->rpool, 4663126258Smlaier (struct pf_addr *)&ip6->ip6_src, &naddr, NULL); 4664126258Smlaier if (!PF_AZERO(&naddr, AF_INET6)) 4665126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 4666126258Smlaier &naddr, AF_INET6); 4667126258Smlaier ifp = r->rpool.cur->ifp; 4668126258Smlaier } else { 4669126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET6)) 4670126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 4671126258Smlaier &s->rt_addr, AF_INET6); 4672126258Smlaier ifp = s->rt_ifp; 4673126258Smlaier } 4674126258Smlaier 4675126258Smlaier if (ifp == NULL) 4676126258Smlaier goto bad; 4677126258Smlaier 4678126258Smlaier if (oifp != ifp) { 4679126258Smlaier mtag = m_tag_find(m0, PACKET_TAG_PF_ROUTED, NULL); 4680126258Smlaier if (mtag == NULL) { 4681126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 0, M_NOWAIT); 4682126258Smlaier if (mtag == NULL) 4683126258Smlaier goto bad; 4684126258Smlaier m_tag_prepend(m0, mtag); 4685126258Smlaier if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS) 4686126258Smlaier goto bad; 4687126258Smlaier else if (m0 == NULL) 4688126258Smlaier goto done; 4689126258Smlaier } 4690126258Smlaier } 4691126258Smlaier 4692126258Smlaier /* 4693126258Smlaier * If the packet is too large for the outgoing interface, 4694126258Smlaier * send back an icmp6 error. 4695126258Smlaier */ 4696126258Smlaier if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 4697126258Smlaier dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 4698126258Smlaier if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 4699126258Smlaier error = nd6_output(ifp, ifp, m0, dst, NULL); 4700126258Smlaier } else { 4701126258Smlaier in6_ifstat_inc(ifp, ifs6_in_toobig); 4702126258Smlaier if (r->rt != PF_DUPTO) 4703126258Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 4704126258Smlaier else 4705126258Smlaier goto bad; 4706126258Smlaier } 4707126258Smlaier 4708126258Smlaierdone: 4709126258Smlaier if (r->rt != PF_DUPTO) 4710126258Smlaier *m = NULL; 4711126258Smlaier return; 4712126258Smlaier 4713126258Smlaierbad: 4714126258Smlaier m_freem(m0); 4715126258Smlaier goto done; 4716126258Smlaier} 4717126258Smlaier#endif /* INET6 */ 4718126258Smlaier 4719126258Smlaier 4720126258Smlaier/* 4721126258Smlaier * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 4722126258Smlaier * off is the offset where the protocol header starts 4723126258Smlaier * len is the total length of protocol header plus payload 4724126258Smlaier * returns 0 when the checksum is valid, otherwise returns 1. 4725126258Smlaier */ 4726126258Smlaierint 4727126258Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 4728126258Smlaier{ 4729126258Smlaier u_int16_t flag_ok, flag_bad; 4730126258Smlaier u_int16_t sum; 4731126258Smlaier 4732126258Smlaier switch (p) { 4733126258Smlaier case IPPROTO_TCP: 4734126258Smlaier flag_ok = M_TCP_CSUM_IN_OK; 4735126258Smlaier flag_bad = M_TCP_CSUM_IN_BAD; 4736126258Smlaier break; 4737126258Smlaier case IPPROTO_UDP: 4738126258Smlaier flag_ok = M_UDP_CSUM_IN_OK; 4739126258Smlaier flag_bad = M_UDP_CSUM_IN_BAD; 4740126258Smlaier break; 4741126258Smlaier case IPPROTO_ICMP: 4742126258Smlaier#ifdef INET6 4743126258Smlaier case IPPROTO_ICMPV6: 4744126258Smlaier#endif /* INET6 */ 4745126258Smlaier flag_ok = flag_bad = 0; 4746126258Smlaier break; 4747126258Smlaier default: 4748126258Smlaier return (1); 4749126258Smlaier } 4750126258Smlaier if (m->m_pkthdr.csum & flag_ok) 4751126258Smlaier return (0); 4752126258Smlaier if (m->m_pkthdr.csum & flag_bad) 4753126258Smlaier return (1); 4754126258Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 4755126258Smlaier return (1); 4756126258Smlaier if (m->m_pkthdr.len < off + len) 4757126258Smlaier return (1); 4758126258Smlaier switch (af) { 4759126258Smlaier case AF_INET: 4760126258Smlaier if (p == IPPROTO_ICMP) { 4761126258Smlaier if (m->m_len < off) 4762126258Smlaier return (1); 4763126258Smlaier m->m_data += off; 4764126258Smlaier m->m_len -= off; 4765126258Smlaier sum = in_cksum(m, len); 4766126258Smlaier m->m_data -= off; 4767126258Smlaier m->m_len += off; 4768126258Smlaier } else { 4769126258Smlaier if (m->m_len < sizeof(struct ip)) 4770126258Smlaier return (1); 4771126258Smlaier sum = in4_cksum(m, p, off, len); 4772126258Smlaier } 4773126258Smlaier break; 4774126258Smlaier#ifdef INET6 4775126258Smlaier case AF_INET6: 4776126258Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 4777126258Smlaier return (1); 4778126258Smlaier sum = in6_cksum(m, p, off, len); 4779126258Smlaier break; 4780126258Smlaier#endif /* INET6 */ 4781126258Smlaier default: 4782126258Smlaier return (1); 4783126258Smlaier } 4784126258Smlaier if (sum) { 4785126258Smlaier m->m_pkthdr.csum |= flag_bad; 4786126258Smlaier switch (p) { 4787126258Smlaier case IPPROTO_TCP: 4788126258Smlaier tcpstat.tcps_rcvbadsum++; 4789126258Smlaier break; 4790126258Smlaier case IPPROTO_UDP: 4791126258Smlaier udpstat.udps_badsum++; 4792126258Smlaier break; 4793126258Smlaier case IPPROTO_ICMP: 4794126258Smlaier icmpstat.icps_checksum++; 4795126258Smlaier break; 4796126258Smlaier#ifdef INET6 4797126258Smlaier case IPPROTO_ICMPV6: 4798126258Smlaier icmp6stat.icp6s_checksum++; 4799126258Smlaier break; 4800126258Smlaier#endif /* INET6 */ 4801126258Smlaier } 4802126258Smlaier return (1); 4803126258Smlaier } 4804126258Smlaier m->m_pkthdr.csum |= flag_ok; 4805126258Smlaier return (0); 4806126258Smlaier} 4807126258Smlaier 4808126258Smlaier#ifdef INET 4809126258Smlaierint 4810126258Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0) 4811126258Smlaier{ 4812126258Smlaier u_short action, reason = 0, log = 0; 4813126258Smlaier struct mbuf *m = *m0; 4814126258Smlaier struct ip *h; 4815126258Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr; 4816126258Smlaier struct pf_state *s = NULL; 4817126258Smlaier struct pf_ruleset *ruleset = NULL; 4818126258Smlaier struct pf_pdesc pd; 4819126258Smlaier int off; 4820126258Smlaier int pqid = 0; 4821126258Smlaier 4822126258Smlaier if (!pf_status.running || 4823126258Smlaier (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) 4824126258Smlaier return (PF_PASS); 4825126258Smlaier 4826126258Smlaier#ifdef DIAGNOSTIC 4827126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 4828126258Smlaier panic("non-M_PKTHDR is passed to pf_test"); 4829126258Smlaier#endif 4830126258Smlaier 4831126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 4832126258Smlaier action = PF_DROP; 4833126258Smlaier REASON_SET(&reason, PFRES_SHORT); 4834126258Smlaier log = 1; 4835126258Smlaier goto done; 4836126258Smlaier } 4837126258Smlaier 4838126258Smlaier /* We do IP header normalization and packet reassembly here */ 4839126258Smlaier if (pf_normalize_ip(m0, dir, ifp, &reason) != PF_PASS) { 4840126258Smlaier action = PF_DROP; 4841126258Smlaier goto done; 4842126258Smlaier } 4843126258Smlaier m = *m0; 4844126258Smlaier h = mtod(m, struct ip *); 4845126258Smlaier 4846126258Smlaier off = h->ip_hl << 2; 4847126258Smlaier if (off < (int)sizeof(*h)) { 4848126258Smlaier action = PF_DROP; 4849126258Smlaier REASON_SET(&reason, PFRES_SHORT); 4850126258Smlaier log = 1; 4851126258Smlaier goto done; 4852126258Smlaier } 4853126258Smlaier 4854126258Smlaier memset(&pd, 0, sizeof(pd)); 4855126258Smlaier pd.src = (struct pf_addr *)&h->ip_src; 4856126258Smlaier pd.dst = (struct pf_addr *)&h->ip_dst; 4857126258Smlaier pd.ip_sum = &h->ip_sum; 4858126258Smlaier pd.proto = h->ip_p; 4859126258Smlaier pd.af = AF_INET; 4860126258Smlaier pd.tos = h->ip_tos; 4861126258Smlaier pd.tot_len = ntohs(h->ip_len); 4862126258Smlaier 4863126258Smlaier /* handle fragments that didn't get reassembled by normalization */ 4864126258Smlaier if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 4865126258Smlaier action = pf_test_fragment(&r, dir, ifp, m, h, 4866126258Smlaier &pd, &a, &ruleset); 4867126258Smlaier goto done; 4868126258Smlaier } 4869126258Smlaier 4870126258Smlaier switch (h->ip_p) { 4871126258Smlaier 4872126258Smlaier case IPPROTO_TCP: { 4873126258Smlaier struct tcphdr th; 4874126258Smlaier 4875126258Smlaier pd.hdr.tcp = &th; 4876126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 4877126258Smlaier &action, &reason, AF_INET)) { 4878126258Smlaier log = action != PF_PASS; 4879126258Smlaier goto done; 4880126258Smlaier } 4881126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 4882126258Smlaier ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 4883126258Smlaier action = PF_DROP; 4884126258Smlaier goto done; 4885126258Smlaier } 4886126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 4887126258Smlaier if ((th.th_flags & TH_ACK) && pd.p_len == 0) 4888126258Smlaier pqid = 1; 4889126258Smlaier action = pf_normalize_tcp(dir, ifp, m, 0, off, h, &pd); 4890126258Smlaier if (action == PF_DROP) 4891126258Smlaier break; 4892126258Smlaier action = pf_test_state_tcp(&s, dir, ifp, m, 0, off, h, &pd, 4893126258Smlaier &reason); 4894126258Smlaier if (action == PF_PASS) { 4895126258Smlaier r = s->rule.ptr; 4896126258Smlaier log = s->log; 4897126258Smlaier } else if (s == NULL) 4898126258Smlaier action = pf_test_tcp(&r, &s, dir, ifp, 4899126258Smlaier m, 0, off, h, &pd, &a, &ruleset); 4900126258Smlaier break; 4901126258Smlaier } 4902126258Smlaier 4903126258Smlaier case IPPROTO_UDP: { 4904126258Smlaier struct udphdr uh; 4905126258Smlaier 4906126258Smlaier pd.hdr.udp = &uh; 4907126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 4908126258Smlaier &action, &reason, AF_INET)) { 4909126258Smlaier log = action != PF_PASS; 4910126258Smlaier goto done; 4911126258Smlaier } 4912126258Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 4913126258Smlaier off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 4914126258Smlaier action = PF_DROP; 4915126258Smlaier goto done; 4916126258Smlaier } 4917126258Smlaier action = pf_test_state_udp(&s, dir, ifp, m, 0, off, h, &pd); 4918126258Smlaier if (action == PF_PASS) { 4919126258Smlaier r = s->rule.ptr; 4920126258Smlaier a = s->anchor.ptr; 4921126258Smlaier log = s->log; 4922126258Smlaier } else if (s == NULL) 4923126258Smlaier action = pf_test_udp(&r, &s, dir, ifp, 4924126258Smlaier m, 0, off, h, &pd, &a, &ruleset); 4925126258Smlaier break; 4926126258Smlaier } 4927126258Smlaier 4928126258Smlaier case IPPROTO_ICMP: { 4929126258Smlaier struct icmp ih; 4930126258Smlaier 4931126258Smlaier pd.hdr.icmp = &ih; 4932126258Smlaier if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 4933126258Smlaier &action, &reason, AF_INET)) { 4934126258Smlaier log = action != PF_PASS; 4935126258Smlaier goto done; 4936126258Smlaier } 4937126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 4938126258Smlaier ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 4939126258Smlaier action = PF_DROP; 4940126258Smlaier goto done; 4941126258Smlaier } 4942126258Smlaier action = pf_test_state_icmp(&s, dir, ifp, m, 0, off, h, &pd); 4943126258Smlaier if (action == PF_PASS) { 4944126258Smlaier r = s->rule.ptr; 4945126258Smlaier r->packets++; 4946126258Smlaier r->bytes += ntohs(h->ip_len); 4947126258Smlaier a = s->anchor.ptr; 4948126258Smlaier if (a != NULL) { 4949126258Smlaier a->packets++; 4950126258Smlaier a->bytes += ntohs(h->ip_len); 4951126258Smlaier } 4952126258Smlaier log = s->log; 4953126258Smlaier } else if (s == NULL) 4954126258Smlaier action = pf_test_icmp(&r, &s, dir, ifp, 4955126258Smlaier m, 0, off, h, &pd, &a, &ruleset); 4956126258Smlaier break; 4957126258Smlaier } 4958126258Smlaier 4959126258Smlaier default: 4960126258Smlaier action = pf_test_state_other(&s, dir, ifp, &pd); 4961126258Smlaier if (action == PF_PASS) { 4962126258Smlaier r = s->rule.ptr; 4963126258Smlaier a = s->anchor.ptr; 4964126258Smlaier log = s->log; 4965126258Smlaier } else if (s == NULL) 4966126258Smlaier action = pf_test_other(&r, &s, dir, ifp, m, off, h, 4967126258Smlaier &pd, &a, &ruleset); 4968126258Smlaier break; 4969126258Smlaier } 4970126258Smlaier 4971126258Smlaier if (ifp == status_ifp) { 4972126258Smlaier pf_status.bcounters[0][dir == PF_OUT] += pd.tot_len; 4973126258Smlaier pf_status.pcounters[0][dir == PF_OUT][action != PF_PASS]++; 4974126258Smlaier } 4975126258Smlaier 4976126258Smlaierdone: 4977126258Smlaier tr = r; 4978126258Smlaier if (r == &pf_default_rule && s != NULL && s->nat_rule.ptr != NULL) 4979126258Smlaier tr = s->nat_rule.ptr; 4980126258Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 4981126258Smlaier pfr_update_stats(tr->src.addr.p.tbl, 4982126258Smlaier (s == NULL || s->direction == dir) ? pd.src : pd.dst, pd.af, 4983126258Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 4984126258Smlaier tr->src.not); 4985126258Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 4986126258Smlaier pfr_update_stats(tr->dst.addr.p.tbl, 4987126258Smlaier (s == NULL || s->direction == dir) ? pd.dst : pd.src, pd.af, 4988126258Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 4989126258Smlaier tr->dst.not); 4990126258Smlaier 4991126258Smlaier if (action == PF_PASS && h->ip_hl > 5 && 4992126258Smlaier !((s && s->allow_opts) || r->allow_opts)) { 4993126258Smlaier action = PF_DROP; 4994126258Smlaier REASON_SET(&reason, PFRES_SHORT); 4995126258Smlaier log = 1; 4996126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 4997126258Smlaier ("pf: dropping packet with ip options\n")); 4998126258Smlaier } 4999126258Smlaier 5000126258Smlaier#ifdef ALTQ 5001126258Smlaier if (action == PF_PASS && r->qid) { 5002126258Smlaier struct m_tag *mtag; 5003126258Smlaier struct altq_tag *atag; 5004126258Smlaier 5005126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 5006126258Smlaier if (mtag != NULL) { 5007126258Smlaier atag = (struct altq_tag *)(mtag + 1); 5008126258Smlaier if (pqid || pd.tos == IPTOS_LOWDELAY) 5009126258Smlaier atag->qid = r->pqid; 5010126258Smlaier else 5011126258Smlaier atag->qid = r->qid; 5012126258Smlaier /* add hints for ecn */ 5013126258Smlaier atag->af = AF_INET; 5014126258Smlaier atag->hdr = h; 5015126258Smlaier m_tag_prepend(m, mtag); 5016126258Smlaier } 5017126258Smlaier } 5018126258Smlaier#endif 5019126258Smlaier 5020126258Smlaier if (log) 5021126258Smlaier PFLOG_PACKET(ifp, h, m, AF_INET, dir, reason, r, a, ruleset); 5022126258Smlaier 5023126258Smlaier if (action == PF_SYNPROXY_DROP) { 5024126258Smlaier m_freem(*m0); 5025126258Smlaier *m0 = NULL; 5026126258Smlaier action = PF_PASS; 5027126258Smlaier } else if (r->rt) 5028126258Smlaier /* pf_route can free the mbuf causing *m0 to become NULL */ 5029126258Smlaier pf_route(m0, r, dir, ifp, s); 5030126258Smlaier 5031126258Smlaier return (action); 5032126258Smlaier} 5033126258Smlaier#endif /* INET */ 5034126258Smlaier 5035126258Smlaier#ifdef INET6 5036126258Smlaierint 5037126258Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0) 5038126258Smlaier{ 5039126258Smlaier u_short action, reason = 0, log = 0; 5040126258Smlaier struct mbuf *m = *m0; 5041126258Smlaier struct ip6_hdr *h; 5042126258Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr; 5043126258Smlaier struct pf_state *s = NULL; 5044126258Smlaier struct pf_ruleset *ruleset = NULL; 5045126258Smlaier struct pf_pdesc pd; 5046126258Smlaier int off, terminal = 0; 5047126258Smlaier 5048126258Smlaier if (!pf_status.running || 5049126258Smlaier (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) 5050126258Smlaier return (PF_PASS); 5051126258Smlaier 5052126258Smlaier#ifdef DIAGNOSTIC 5053126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 5054126258Smlaier panic("non-M_PKTHDR is passed to pf_test"); 5055126258Smlaier#endif 5056126258Smlaier 5057126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 5058126258Smlaier action = PF_DROP; 5059126258Smlaier REASON_SET(&reason, PFRES_SHORT); 5060126258Smlaier log = 1; 5061126258Smlaier goto done; 5062126258Smlaier } 5063126258Smlaier 5064126258Smlaier /* We do IP header normalization and packet reassembly here */ 5065126258Smlaier if (pf_normalize_ip6(m0, dir, ifp, &reason) != PF_PASS) { 5066126258Smlaier action = PF_DROP; 5067126258Smlaier goto done; 5068126258Smlaier } 5069126258Smlaier m = *m0; 5070126258Smlaier h = mtod(m, struct ip6_hdr *); 5071126258Smlaier 5072126258Smlaier memset(&pd, 0, sizeof(pd)); 5073126258Smlaier pd.src = (struct pf_addr *)&h->ip6_src; 5074126258Smlaier pd.dst = (struct pf_addr *)&h->ip6_dst; 5075126258Smlaier pd.ip_sum = NULL; 5076126258Smlaier pd.af = AF_INET6; 5077126258Smlaier pd.tos = 0; 5078126258Smlaier pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 5079126258Smlaier 5080126258Smlaier off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 5081126258Smlaier pd.proto = h->ip6_nxt; 5082126258Smlaier do { 5083126258Smlaier switch (pd.proto) { 5084126258Smlaier case IPPROTO_FRAGMENT: 5085126258Smlaier action = pf_test_fragment(&r, dir, ifp, m, h, 5086126258Smlaier &pd, &a, &ruleset); 5087126258Smlaier if (action == PF_DROP) 5088126258Smlaier REASON_SET(&reason, PFRES_FRAG); 5089126258Smlaier goto done; 5090126258Smlaier case IPPROTO_AH: 5091126258Smlaier case IPPROTO_HOPOPTS: 5092126258Smlaier case IPPROTO_ROUTING: 5093126258Smlaier case IPPROTO_DSTOPTS: { 5094126258Smlaier /* get next header and header length */ 5095126258Smlaier struct ip6_ext opt6; 5096126258Smlaier 5097126258Smlaier if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 5098126258Smlaier NULL, NULL, pd.af)) { 5099126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5100126258Smlaier ("pf: IPv6 short opt\n")); 5101126258Smlaier action = PF_DROP; 5102126258Smlaier REASON_SET(&reason, PFRES_SHORT); 5103126258Smlaier log = 1; 5104126258Smlaier goto done; 5105126258Smlaier } 5106126258Smlaier if (pd.proto == IPPROTO_AH) 5107126258Smlaier off += (opt6.ip6e_len + 2) * 4; 5108126258Smlaier else 5109126258Smlaier off += (opt6.ip6e_len + 1) * 8; 5110126258Smlaier pd.proto = opt6.ip6e_nxt; 5111126258Smlaier /* goto the next header */ 5112126258Smlaier break; 5113126258Smlaier } 5114126258Smlaier default: 5115126258Smlaier terminal++; 5116126258Smlaier break; 5117126258Smlaier } 5118126258Smlaier } while (!terminal); 5119126258Smlaier 5120126258Smlaier switch (pd.proto) { 5121126258Smlaier 5122126258Smlaier case IPPROTO_TCP: { 5123126258Smlaier struct tcphdr th; 5124126258Smlaier 5125126258Smlaier pd.hdr.tcp = &th; 5126126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 5127126258Smlaier &action, &reason, AF_INET6)) { 5128126258Smlaier log = action != PF_PASS; 5129126258Smlaier goto done; 5130126258Smlaier } 5131126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 5132126258Smlaier ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) { 5133126258Smlaier action = PF_DROP; 5134126258Smlaier goto done; 5135126258Smlaier } 5136126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 5137126258Smlaier action = pf_normalize_tcp(dir, ifp, m, 0, off, h, &pd); 5138126258Smlaier if (action == PF_DROP) 5139126258Smlaier break; 5140126258Smlaier action = pf_test_state_tcp(&s, dir, ifp, m, 0, off, h, &pd, 5141126258Smlaier &reason); 5142126258Smlaier if (action == PF_PASS) { 5143126258Smlaier r = s->rule.ptr; 5144126258Smlaier log = s->log; 5145126258Smlaier } else if (s == NULL) 5146126258Smlaier action = pf_test_tcp(&r, &s, dir, ifp, 5147126258Smlaier m, 0, off, h, &pd, &a, &ruleset); 5148126258Smlaier break; 5149126258Smlaier } 5150126258Smlaier 5151126258Smlaier case IPPROTO_UDP: { 5152126258Smlaier struct udphdr uh; 5153126258Smlaier 5154126258Smlaier pd.hdr.udp = &uh; 5155126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5156126258Smlaier &action, &reason, AF_INET6)) { 5157126258Smlaier log = action != PF_PASS; 5158126258Smlaier goto done; 5159126258Smlaier } 5160126258Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 5161126258Smlaier off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) { 5162126258Smlaier action = PF_DROP; 5163126258Smlaier goto done; 5164126258Smlaier } 5165126258Smlaier action = pf_test_state_udp(&s, dir, ifp, m, 0, off, h, &pd); 5166126258Smlaier if (action == PF_PASS) { 5167126258Smlaier r = s->rule.ptr; 5168126258Smlaier log = s->log; 5169126258Smlaier } else if (s == NULL) 5170126258Smlaier action = pf_test_udp(&r, &s, dir, ifp, 5171126258Smlaier m, 0, off, h, &pd, &a, &ruleset); 5172126258Smlaier break; 5173126258Smlaier } 5174126258Smlaier 5175126258Smlaier case IPPROTO_ICMPV6: { 5176126258Smlaier struct icmp6_hdr ih; 5177126258Smlaier 5178126258Smlaier pd.hdr.icmp6 = &ih; 5179126258Smlaier if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 5180126258Smlaier &action, &reason, AF_INET6)) { 5181126258Smlaier log = action != PF_PASS; 5182126258Smlaier goto done; 5183126258Smlaier } 5184126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 5185126258Smlaier ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) { 5186126258Smlaier action = PF_DROP; 5187126258Smlaier goto done; 5188126258Smlaier } 5189126258Smlaier action = pf_test_state_icmp(&s, dir, ifp, 5190126258Smlaier m, 0, off, h, &pd); 5191126258Smlaier if (action == PF_PASS) { 5192126258Smlaier r = s->rule.ptr; 5193126258Smlaier r->packets++; 5194126258Smlaier r->bytes += h->ip6_plen; 5195126258Smlaier log = s->log; 5196126258Smlaier } else if (s == NULL) 5197126258Smlaier action = pf_test_icmp(&r, &s, dir, ifp, 5198126258Smlaier m, 0, off, h, &pd, &a, &ruleset); 5199126258Smlaier break; 5200126258Smlaier } 5201126258Smlaier 5202126258Smlaier default: 5203126258Smlaier action = pf_test_other(&r, &s, dir, ifp, m, off, h, 5204126258Smlaier &pd, &a, &ruleset); 5205126258Smlaier break; 5206126258Smlaier } 5207126258Smlaier 5208126258Smlaier if (ifp == status_ifp) { 5209126258Smlaier pf_status.bcounters[1][dir == PF_OUT] += pd.tot_len; 5210126258Smlaier pf_status.pcounters[1][dir == PF_OUT][action != PF_PASS]++; 5211126258Smlaier } 5212126258Smlaier 5213126258Smlaierdone: 5214126258Smlaier tr = r; 5215126258Smlaier if (r == &pf_default_rule && s != NULL && s->nat_rule.ptr != NULL) 5216126258Smlaier tr = s->nat_rule.ptr; 5217126258Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 5218126258Smlaier pfr_update_stats(tr->src.addr.p.tbl, 5219126258Smlaier (s == NULL || s->direction == dir) ? pd.src : pd.dst, pd.af, 5220126258Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5221126258Smlaier tr->src.not); 5222126258Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 5223126258Smlaier pfr_update_stats(tr->dst.addr.p.tbl, 5224126258Smlaier (s == NULL || s->direction == dir) ? pd.dst : pd.src, pd.af, 5225126258Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5226126258Smlaier tr->dst.not); 5227126258Smlaier 5228126258Smlaier /* XXX handle IPv6 options, if not allowed. not implemented. */ 5229126258Smlaier 5230126258Smlaier#ifdef ALTQ 5231126258Smlaier if (action == PF_PASS && r->qid) { 5232126258Smlaier struct m_tag *mtag; 5233126258Smlaier struct altq_tag *atag; 5234126258Smlaier 5235126258Smlaier mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT); 5236126258Smlaier if (mtag != NULL) { 5237126258Smlaier atag = (struct altq_tag *)(mtag + 1); 5238126258Smlaier if (pd.tos == IPTOS_LOWDELAY) 5239126258Smlaier atag->qid = r->pqid; 5240126258Smlaier else 5241126258Smlaier atag->qid = r->qid; 5242126258Smlaier /* add hints for ecn */ 5243126258Smlaier atag->af = AF_INET6; 5244126258Smlaier atag->hdr = h; 5245126258Smlaier m_tag_prepend(m, mtag); 5246126258Smlaier } 5247126258Smlaier } 5248126258Smlaier#endif 5249126258Smlaier 5250126258Smlaier if (log) 5251126258Smlaier PFLOG_PACKET(ifp, h, m, AF_INET6, dir, reason, r, a, ruleset); 5252126258Smlaier 5253126258Smlaier if (action == PF_SYNPROXY_DROP) { 5254126258Smlaier m_freem(*m0); 5255126258Smlaier *m0 = NULL; 5256126258Smlaier action = PF_PASS; 5257126258Smlaier } else if (r->rt) 5258126258Smlaier /* pf_route6 can free the mbuf causing *m0 to become NULL */ 5259126258Smlaier pf_route6(m0, r, dir, ifp, s); 5260126258Smlaier 5261126258Smlaier return (action); 5262126258Smlaier} 5263126258Smlaier#endif /* INET6 */ 5264