1 /* $FreeBSD: src/sys/contrib/pf/net/pf_if.c,v 1.6 2004/09/14 15:20:24 mlaier Exp $ */ 2 /* $OpenBSD: pf_if.c,v 1.11 2004/03/15 11:38:23 cedric Exp $ */ 3 /* add $OpenBSD: pf_if.c,v 1.19 2004/08/11 12:06:44 henning Exp $ */ 4 /* $DragonFly: src/sys/net/pf/pf_if.c,v 1.4 2005/06/15 16:32:58 joerg Exp $ */ 5 6 /* 7 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 8 * 9 * Copyright (c) 2001 Daniel Hartmeier 10 * Copyright (c) 2003 Cedric Berger 11 * All rights reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * - Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials provided 22 * with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 27 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 28 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 32 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 34 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/eventhandler.h> 46 #include <sys/filio.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/kernel.h> 50 #include <sys/thread2.h> 51 #include <sys/time.h> 52 #include <vm/vm_zone.h> 53 54 #include <net/if.h> 55 #include <net/if_types.h> 56 #include <net/route.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_var.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/ip.h> 62 #include <netinet/ip_var.h> 63 64 #include <net/pf/pfvar.h> 65 66 #ifdef INET6 67 #include <netinet/ip6.h> 68 #endif /* INET6 */ 69 70 #define ACCEPT_FLAGS(oklist) \ 71 do { \ 72 if ((flags & ~(oklist)) & \ 73 PFI_FLAG_ALLMASK) \ 74 return (EINVAL); \ 75 } while (0) 76 77 #define senderr(e) do { rv = (e); goto _bad; } while (0) 78 79 struct pfi_kif **pfi_index2kif; 80 struct pfi_kif *pfi_self, *pfi_dummy; 81 int pfi_indexlim; 82 struct pfi_ifhead pfi_ifs; 83 struct pfi_statehead pfi_statehead; 84 int pfi_ifcnt; 85 vm_zone_t pfi_addr_pl; 86 long pfi_update = 1; 87 struct pfr_addr *pfi_buffer; 88 int pfi_buffer_cnt; 89 int pfi_buffer_max; 90 char pfi_reserved_anchor[PF_ANCHOR_NAME_SIZE] = 91 PF_RESERVED_ANCHOR; 92 char pfi_interface_ruleset[PF_RULESET_NAME_SIZE] = 93 PF_INTERFACE_RULESET; 94 95 eventhandler_tag pfi_clone_cookie = NULL; 96 eventhandler_tag pfi_attach_cookie = NULL; 97 eventhandler_tag pfi_detach_cookie = NULL; 98 99 void pfi_dynaddr_update(void *); 100 void pfi_kifaddr_update(void *); 101 void pfi_table_update(struct pfr_ktable *, struct pfi_kif *, 102 int, int); 103 void pfi_instance_add(struct ifnet *, int, int); 104 void pfi_address_add(struct sockaddr *, int, int); 105 int pfi_if_compare(struct pfi_kif *, struct pfi_kif *); 106 struct pfi_kif *pfi_if_create(const char *, struct pfi_kif *, int); 107 void pfi_copy_group(char *, const char *, int); 108 void pfi_dynamic_drivers(void); 109 void pfi_newgroup(const char *, int); 110 int pfi_skip_if(const char *, struct pfi_kif *, int); 111 int pfi_unmask(void *); 112 void pfi_dohooks(struct pfi_kif *); 113 void pfi_kifaddr_update_event(void *, struct ifnet *); 114 void pfi_attach_clone_event(void *, struct if_clone *); 115 void pfi_attach_ifnet_event(void *, struct ifnet *); 116 void pfi_detach_ifnet_event(void *, struct ifnet *); 117 118 RB_PROTOTYPE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare); 119 RB_GENERATE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare); 120 121 #define PFI_DYNAMIC_BUSES { "pcmcia", "cardbus", "uhub" } 122 #define PFI_BUFFER_MAX 0x10000 123 MALLOC_DEFINE(PFI_MTYPE, "pf_if", "pf interface table"); 124 125 void 126 pfi_initialize(void) 127 { 128 struct ifnet *ifp; 129 130 if (pfi_self != NULL) /* already initialized */ 131 return; 132 133 TAILQ_INIT(&pfi_statehead); 134 pfi_buffer_max = 64; 135 pfi_buffer = malloc(pfi_buffer_max * sizeof(*pfi_buffer), 136 PFI_MTYPE, M_WAITOK); 137 pfi_self = pfi_if_create("self", NULL, PFI_IFLAG_GROUP); 138 pfi_dynamic_drivers(); 139 140 TAILQ_FOREACH(ifp, &ifnet, if_link) { 141 if (ifp->if_dunit != IF_DUNIT_NONE) 142 pfi_attach_ifnet(ifp); 143 } 144 pfi_dummy = pfi_if_create("notyet", pfi_self, 145 PFI_IFLAG_GROUP | PFI_IFLAG_DYNAMIC); 146 pfi_attach_cookie = EVENTHANDLER_REGISTER(ifnet_attach_event, 147 pfi_attach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY); 148 pfi_detach_cookie = EVENTHANDLER_REGISTER(ifnet_detach_event, 149 pfi_detach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY); 150 pfi_clone_cookie = EVENTHANDLER_REGISTER(if_clone_event, 151 pfi_attach_clone_event, NULL, EVENTHANDLER_PRI_ANY); 152 } 153 154 void 155 pfi_cleanup(void) 156 { 157 struct pfi_kif *p, key; 158 struct ifnet *ifp; 159 160 EVENTHANDLER_DEREGISTER(ifnet_attach_event, pfi_attach_cookie); 161 EVENTHANDLER_DEREGISTER(ifnet_detach_event, pfi_detach_cookie); 162 EVENTHANDLER_DEREGISTER(if_clone_event, pfi_clone_cookie); 163 164 /* release PFI_IFLAG_INSTANCE */ 165 TAILQ_FOREACH(ifp, &ifnet, if_link) { 166 strlcpy(key.pfik_name, ifp->if_xname, sizeof(key.pfik_name)); 167 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 168 if (p != NULL) 169 pfi_detach_ifnet(ifp); 170 } 171 172 /* XXX clear all other interface group */ 173 while ((p = RB_MIN(pfi_ifhead, &pfi_ifs))) { 174 RB_REMOVE(pfi_ifhead, &pfi_ifs, p); 175 176 free(p->pfik_ah_head, PFI_MTYPE); 177 free(p, PFI_MTYPE); 178 } 179 free(pfi_index2kif, PFI_MTYPE); 180 free(pfi_buffer, PFI_MTYPE); 181 pfi_index2kif = NULL; 182 pfi_buffer = NULL; 183 pfi_self = NULL; 184 } 185 186 /* 187 * Wrapper functions for FreeBSD eventhandler 188 */ 189 void 190 pfi_kifaddr_update_event(void *arg, struct ifnet *ifp) 191 { 192 struct pfi_kif *p = arg; 193 194 /* 195 * Check to see if it is 'our' interface as we do not have per 196 * interface hooks and thus get an update for every interface. 197 */ 198 if (p && p->pfik_ifp == ifp) 199 pfi_kifaddr_update(p); 200 } 201 202 void 203 pfi_attach_clone_event(void *arg __unused, struct if_clone *ifc) 204 { 205 pfi_attach_clone(ifc); 206 } 207 208 void 209 pfi_attach_ifnet_event(void *arg __unused, struct ifnet *ifp) 210 { 211 if (ifp->if_dunit != IF_DUNIT_NONE) 212 pfi_attach_ifnet(ifp); 213 } 214 215 void 216 pfi_detach_ifnet_event(void *arg __unused, struct ifnet *ifp) 217 { 218 pfi_detach_ifnet(ifp); 219 } 220 221 void 222 pfi_attach_clone(struct if_clone *ifc) 223 { 224 pfi_initialize(); 225 pfi_newgroup(ifc->ifc_name, PFI_IFLAG_CLONABLE); 226 } 227 228 void 229 pfi_attach_ifnet(struct ifnet *ifp) 230 { 231 struct pfi_kif *p, *q, key; 232 int realname; 233 234 pfi_initialize(); 235 crit_enter(); 236 pfi_update++; 237 if (ifp->if_index >= pfi_indexlim) { 238 /* 239 * grow pfi_index2kif, similar to ifindex2ifnet code in if.c 240 */ 241 size_t m, n, oldlim; 242 struct pfi_kif **mp, **np; 243 244 oldlim = pfi_indexlim; 245 if (pfi_indexlim == 0) 246 pfi_indexlim = 64; 247 while (ifp->if_index >= pfi_indexlim) 248 pfi_indexlim <<= 1; 249 250 m = oldlim * sizeof(struct pfi_kif *); 251 mp = pfi_index2kif; 252 n = pfi_indexlim * sizeof(struct pfi_kif *); 253 np = malloc(n, PFI_MTYPE, M_NOWAIT); 254 if (np == NULL) 255 panic("pfi_attach_ifnet: " 256 "cannot allocate translation table"); 257 bzero(np, n); 258 if (mp != NULL) 259 bcopy(mp, np, m); 260 pfi_index2kif = np; 261 if (mp != NULL) 262 free(mp, PFI_MTYPE); 263 } 264 265 strlcpy(key.pfik_name, ifp->if_xname, sizeof(key.pfik_name)); 266 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 267 /* some additional trickery for placeholders */ 268 if ((p == NULL) || (p->pfik_parent == pfi_dummy)) { 269 /* are we looking at a renamed instance or not? */ 270 pfi_copy_group(key.pfik_name, ifp->if_xname, 271 sizeof(key.pfik_name)); 272 realname = (strncmp(key.pfik_name, ifp->if_dname, 273 sizeof(key.pfik_name)) == 0); 274 /* add group */ 275 /* we can change if_xname, hence use if_dname as group id */ 276 pfi_copy_group(key.pfik_name, ifp->if_dname, 277 sizeof(key.pfik_name)); 278 q = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 279 if (q == NULL) 280 q = pfi_if_create(key.pfik_name, pfi_self, 281 PFI_IFLAG_GROUP|PFI_IFLAG_DYNAMIC); 282 else if (q->pfik_parent == pfi_dummy) { 283 q->pfik_parent = pfi_self; 284 q->pfik_flags = (PFI_IFLAG_GROUP | PFI_IFLAG_DYNAMIC); 285 } 286 if (q == NULL) 287 panic("pfi_attach_ifnet: " 288 "cannot allocate '%s' group", key.pfik_name); 289 290 /* add/modify interface */ 291 if (p == NULL) 292 p = pfi_if_create(ifp->if_xname, q, 293 realname?PFI_IFLAG_INSTANCE:PFI_IFLAG_PLACEHOLDER); 294 else { 295 /* remove from the dummy group */ 296 /* XXX: copy stats? We should not have any!!! */ 297 pfi_dummy->pfik_delcnt++; 298 TAILQ_REMOVE(&pfi_dummy->pfik_grouphead, p, 299 pfik_instances); 300 /* move to the right group */ 301 p->pfik_parent = q; 302 q->pfik_addcnt++; 303 TAILQ_INSERT_TAIL(&q->pfik_grouphead, p, 304 pfik_instances); 305 if (realname) { 306 p->pfik_flags &= ~PFI_IFLAG_PLACEHOLDER; 307 p->pfik_flags |= PFI_IFLAG_INSTANCE; 308 } 309 } 310 if (p == NULL) 311 panic("pfi_attach_ifnet: " 312 "cannot allocate '%s' interface", ifp->if_xname); 313 } else 314 q = p->pfik_parent; 315 p->pfik_ifp = ifp; 316 p->pfik_flags |= PFI_IFLAG_ATTACHED; 317 p->pfik_ah_cookie = EVENTHANDLER_REGISTER(ifaddr_event, 318 pfi_kifaddr_update_event, p, EVENTHANDLER_PRI_ANY); 319 pfi_index2kif[ifp->if_index] = p; 320 pfi_dohooks(p); 321 crit_exit(); 322 } 323 324 void 325 pfi_detach_ifnet(struct ifnet *ifp) 326 { 327 struct pfi_kif *p, *q, key; 328 329 strlcpy(key.pfik_name, ifp->if_xname, sizeof(key.pfik_name)); 330 331 crit_enter(); 332 pfi_update++; 333 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 334 if (p == NULL) { 335 printf("pfi_detach_ifnet: cannot find %s", ifp->if_xname); 336 crit_exit(); 337 return; 338 } 339 EVENTHANDLER_DEREGISTER(ifaddr_event, p->pfik_ah_cookie); 340 q = p->pfik_parent; 341 p->pfik_ifp = NULL; 342 p->pfik_flags &= ~PFI_IFLAG_ATTACHED; 343 pfi_index2kif[ifp->if_index] = NULL; 344 pfi_dohooks(p); 345 pfi_maybe_destroy(p); 346 crit_exit(); 347 } 348 349 struct pfi_kif * 350 pfi_lookup_create(const char *name) 351 { 352 struct pfi_kif *p, *q, key; 353 354 crit_enter(); 355 p = pfi_lookup_if(name); 356 if (p == NULL) { 357 pfi_copy_group(key.pfik_name, name, sizeof(key.pfik_name)); 358 q = pfi_lookup_if(key.pfik_name); 359 if ((q != NULL) && (q->pfik_parent != pfi_dummy)) 360 p = pfi_if_create(name, q, PFI_IFLAG_INSTANCE); 361 else { 362 if (pfi_dummy == NULL) 363 panic("no 'notyet' dummy group"); 364 p = pfi_if_create(name, pfi_dummy, 365 PFI_IFLAG_PLACEHOLDER); 366 } 367 } 368 crit_exit(); 369 return (p); 370 } 371 372 struct pfi_kif * 373 pfi_attach_rule(const char *name) 374 { 375 struct pfi_kif *p; 376 377 p = pfi_lookup_create(name); 378 if (p != NULL) 379 p->pfik_rules++; 380 return (p); 381 } 382 383 void 384 pfi_detach_rule(struct pfi_kif *p) 385 { 386 if (p == NULL) 387 return; 388 if (p->pfik_rules > 0) 389 p->pfik_rules--; 390 else 391 printf("pfi_detach_rule: reference count at 0\n"); 392 pfi_maybe_destroy(p); 393 } 394 395 void 396 pfi_attach_state(struct pfi_kif *p) 397 { 398 if (!p->pfik_states++) 399 TAILQ_INSERT_TAIL(&pfi_statehead, p, pfik_w_states); 400 } 401 402 void 403 pfi_detach_state(struct pfi_kif *p) 404 { 405 if (p == NULL) 406 return; 407 if (p->pfik_states <= 0) { 408 printf("pfi_detach_state: reference count <= 0\n"); 409 return; 410 } 411 if (!--p->pfik_states) 412 TAILQ_REMOVE(&pfi_statehead, p, pfik_w_states); 413 pfi_maybe_destroy(p); 414 } 415 416 int 417 pfi_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af) 418 { 419 struct pfi_dynaddr *dyn; 420 char tblname[PF_TABLE_NAME_SIZE]; 421 struct pf_ruleset *ruleset = NULL; 422 int rv = 0; 423 424 if (aw->type != PF_ADDR_DYNIFTL) 425 return (0); 426 dyn = pool_get(&pfi_addr_pl, PR_NOWAIT); 427 if (dyn == NULL) 428 return (1); 429 bzero(dyn, sizeof(*dyn)); 430 431 crit_enter(); 432 dyn->pfid_kif = pfi_attach_rule(aw->v.ifname); 433 if (dyn->pfid_kif == NULL) 434 senderr(1); 435 436 dyn->pfid_net = pfi_unmask(&aw->v.a.mask); 437 if (af == AF_INET && dyn->pfid_net == 32) 438 dyn->pfid_net = 128; 439 strlcpy(tblname, aw->v.ifname, sizeof(tblname)); 440 if (aw->iflags & PFI_AFLAG_NETWORK) 441 strlcat(tblname, ":network", sizeof(tblname)); 442 if (aw->iflags & PFI_AFLAG_BROADCAST) 443 strlcat(tblname, ":broadcast", sizeof(tblname)); 444 if (aw->iflags & PFI_AFLAG_PEER) 445 strlcat(tblname, ":peer", sizeof(tblname)); 446 if (aw->iflags & PFI_AFLAG_NOALIAS) 447 strlcat(tblname, ":0", sizeof(tblname)); 448 if (dyn->pfid_net != 128) 449 snprintf(tblname + strlen(tblname), 450 sizeof(tblname) - strlen(tblname), "/%d", dyn->pfid_net); 451 ruleset = pf_find_or_create_ruleset(pfi_reserved_anchor, 452 pfi_interface_ruleset); 453 if (ruleset == NULL) 454 senderr(1); 455 456 dyn->pfid_kt = pfr_attach_table(ruleset, tblname); 457 if (dyn->pfid_kt == NULL) 458 senderr(1); 459 460 dyn->pfid_kt->pfrkt_flags |= PFR_TFLAG_ACTIVE; 461 dyn->pfid_iflags = aw->iflags; 462 dyn->pfid_af = af; 463 dyn->pfid_hook_cookie = hook_establish(dyn->pfid_kif->pfik_ah_head, 1, 464 pfi_dynaddr_update, dyn); 465 if (dyn->pfid_hook_cookie == NULL) 466 senderr(1); 467 468 aw->p.dyn = dyn; 469 pfi_dynaddr_update(aw->p.dyn); 470 crit_exit(); 471 return (0); 472 473 _bad: 474 if (dyn->pfid_kt != NULL) 475 pfr_detach_table(dyn->pfid_kt); 476 if (ruleset != NULL) 477 pf_remove_if_empty_ruleset(ruleset); 478 if (dyn->pfid_kif != NULL) 479 pfi_detach_rule(dyn->pfid_kif); 480 pool_put(&pfi_addr_pl, dyn); 481 crit_exit(); 482 return (rv); 483 } 484 485 void 486 pfi_dynaddr_update(void *p) 487 { 488 struct pfi_dynaddr *dyn = (struct pfi_dynaddr *)p; 489 struct pfi_kif *kif = dyn->pfid_kif; 490 struct pfr_ktable *kt = dyn->pfid_kt; 491 492 if (dyn == NULL || kif == NULL || kt == NULL) 493 panic("pfi_dynaddr_update"); 494 if (kt->pfrkt_larg != pfi_update) { 495 /* this table needs to be brought up-to-date */ 496 pfi_table_update(kt, kif, dyn->pfid_net, dyn->pfid_iflags); 497 kt->pfrkt_larg = pfi_update; 498 } 499 pfr_dynaddr_update(kt, dyn); 500 } 501 502 void 503 pfi_table_update(struct pfr_ktable *kt, struct pfi_kif *kif, int net, int flags) 504 { 505 int e, size2 = 0; 506 struct pfi_kif *p; 507 struct pfr_table t; 508 509 if ((kif->pfik_flags & PFI_IFLAG_INSTANCE) && kif->pfik_ifp == NULL) { 510 pfr_clr_addrs(&kt->pfrkt_t, NULL, 0); 511 return; 512 } 513 pfi_buffer_cnt = 0; 514 if ((kif->pfik_flags & PFI_IFLAG_INSTANCE)) 515 pfi_instance_add(kif->pfik_ifp, net, flags); 516 else if (strcmp(kif->pfik_name, "self")) { 517 TAILQ_FOREACH(p, &kif->pfik_grouphead, pfik_instances) 518 pfi_instance_add(p->pfik_ifp, net, flags); 519 } else { 520 RB_FOREACH(p, pfi_ifhead, &pfi_ifs) 521 if (p->pfik_flags & PFI_IFLAG_INSTANCE) 522 pfi_instance_add(p->pfik_ifp, net, flags); 523 } 524 t = kt->pfrkt_t; 525 t.pfrt_flags = 0; 526 if ((e = pfr_set_addrs(&t, pfi_buffer, pfi_buffer_cnt, &size2, 527 NULL, NULL, NULL, 0))) 528 printf("pfi_table_update: cannot set %d new addresses " 529 "into table %s: %d\n", pfi_buffer_cnt, kt->pfrkt_name, e); 530 } 531 532 void 533 pfi_instance_add(struct ifnet *ifp, int net, int flags) 534 { 535 struct ifaddr *ia; 536 int got4 = 0, got6 = 0; 537 int net2, af; 538 539 if (ifp == NULL) 540 return; 541 TAILQ_FOREACH(ia, &ifp->if_addrlist, ifa_list) { 542 if (ia->ifa_addr == NULL) 543 continue; 544 af = ia->ifa_addr->sa_family; 545 if (af != AF_INET && af != AF_INET6) 546 continue; 547 /* 548 * XXX: For point-to-point interfaces, (ifname:0) and IPv4, 549 * jump over address without a proper route to work 550 * around a problem with ppp not fully removing the 551 * address used during IPCP. 552 */ 553 if ((ifp->if_flags & IFF_POINTOPOINT) && 554 !(ia->ifa_flags & IFA_ROUTE) && 555 (flags & PFI_AFLAG_NOALIAS) && (af == AF_INET)) 556 continue; 557 if ((flags & PFI_AFLAG_BROADCAST) && af == AF_INET6) 558 continue; 559 if ((flags & PFI_AFLAG_BROADCAST) && 560 !(ifp->if_flags & IFF_BROADCAST)) 561 continue; 562 if ((flags & PFI_AFLAG_PEER) && 563 !(ifp->if_flags & IFF_POINTOPOINT)) 564 continue; 565 if ((flags & PFI_AFLAG_NETWORK) && af == AF_INET6 && 566 IN6_IS_ADDR_LINKLOCAL( 567 &((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr)) 568 continue; 569 if (flags & PFI_AFLAG_NOALIAS) { 570 if (af == AF_INET && got4) 571 continue; 572 if (af == AF_INET6 && got6) 573 continue; 574 } 575 if (af == AF_INET) 576 got4 = 1; 577 else 578 got6 = 1; 579 net2 = net; 580 if (net2 == 128 && (flags & PFI_AFLAG_NETWORK)) { 581 if (af == AF_INET) { 582 net2 = pfi_unmask(&((struct sockaddr_in *) 583 ia->ifa_netmask)->sin_addr); 584 } else { 585 net2 = pfi_unmask(&((struct sockaddr_in6 *) 586 ia->ifa_netmask)->sin6_addr); 587 } 588 } 589 if (af == AF_INET && net2 > 32) 590 net2 = 32; 591 if (flags & PFI_AFLAG_BROADCAST) 592 pfi_address_add(ia->ifa_broadaddr, af, net2); 593 else if (flags & PFI_AFLAG_PEER) 594 pfi_address_add(ia->ifa_dstaddr, af, net2); 595 else 596 pfi_address_add(ia->ifa_addr, af, net2); 597 } 598 } 599 600 void 601 pfi_address_add(struct sockaddr *sa, int af, int net) 602 { 603 struct pfr_addr *p; 604 int i; 605 606 if (pfi_buffer_cnt >= pfi_buffer_max) { 607 int new_max = pfi_buffer_max * 2; 608 609 if (new_max > PFI_BUFFER_MAX) { 610 printf("pfi_address_add: address buffer full (%d/%d)\n", 611 pfi_buffer_cnt, PFI_BUFFER_MAX); 612 return; 613 } 614 p = malloc(new_max * sizeof(*pfi_buffer), PFI_MTYPE, 615 M_NOWAIT); 616 if (p == NULL) { 617 printf("pfi_address_add: no memory to grow buffer " 618 "(%d/%d)\n", pfi_buffer_cnt, PFI_BUFFER_MAX); 619 return; 620 } 621 memcpy(pfi_buffer, p, pfi_buffer_cnt * sizeof(*pfi_buffer)); 622 /* no need to zero buffer */ 623 free(pfi_buffer, PFI_MTYPE); 624 pfi_buffer = p; 625 pfi_buffer_max = new_max; 626 } 627 if (af == AF_INET && net > 32) 628 net = 128; 629 p = pfi_buffer + pfi_buffer_cnt++; 630 bzero(p, sizeof(*p)); 631 p->pfra_af = af; 632 p->pfra_net = net; 633 if (af == AF_INET) 634 p->pfra_ip4addr = ((struct sockaddr_in *)sa)->sin_addr; 635 if (af == AF_INET6) { 636 p->pfra_ip6addr = ((struct sockaddr_in6 *)sa)->sin6_addr; 637 if (IN6_IS_ADDR_LINKLOCAL(&p->pfra_ip6addr)) 638 p->pfra_ip6addr.s6_addr16[1] = 0; 639 } 640 /* mask network address bits */ 641 if (net < 128) 642 ((caddr_t)p)[p->pfra_net/8] &= ~(0xFF >> (p->pfra_net%8)); 643 for (i = (p->pfra_net+7)/8; i < sizeof(p->pfra_u); i++) 644 ((caddr_t)p)[i] = 0; 645 } 646 647 void 648 pfi_dynaddr_remove(struct pf_addr_wrap *aw) 649 { 650 if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL || 651 aw->p.dyn->pfid_kif == NULL || aw->p.dyn->pfid_kt == NULL) 652 return; 653 654 crit_enter(); 655 hook_disestablish(aw->p.dyn->pfid_kif->pfik_ah_head, 656 aw->p.dyn->pfid_hook_cookie); 657 pfi_detach_rule(aw->p.dyn->pfid_kif); 658 aw->p.dyn->pfid_kif = NULL; 659 pfr_detach_table(aw->p.dyn->pfid_kt); 660 aw->p.dyn->pfid_kt = NULL; 661 pool_put(&pfi_addr_pl, aw->p.dyn); 662 aw->p.dyn = NULL; 663 crit_exit(); 664 } 665 666 void 667 pfi_dynaddr_copyout(struct pf_addr_wrap *aw) 668 { 669 if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL || 670 aw->p.dyn->pfid_kif == NULL) 671 return; 672 aw->p.dyncnt = aw->p.dyn->pfid_acnt4 + aw->p.dyn->pfid_acnt6; 673 } 674 675 void 676 pfi_kifaddr_update(void *v) 677 { 678 crit_enter(); 679 pfi_update++; 680 pfi_dohooks(v); 681 crit_exit(); 682 } 683 684 int 685 pfi_if_compare(struct pfi_kif *p, struct pfi_kif *q) 686 { 687 return (strncmp(p->pfik_name, q->pfik_name, IFNAMSIZ)); 688 } 689 690 struct pfi_kif * 691 pfi_if_create(const char *name, struct pfi_kif *q, int flags) 692 { 693 struct pfi_kif *p; 694 695 p = malloc(sizeof(*p), PFI_MTYPE, M_NOWAIT); 696 if (p == NULL) 697 return (NULL); 698 bzero(p, sizeof(*p)); 699 p->pfik_ah_head = malloc(sizeof(*p->pfik_ah_head), PFI_MTYPE, 700 M_NOWAIT); 701 if (p->pfik_ah_head == NULL) { 702 free(p, PFI_MTYPE); 703 return (NULL); 704 } 705 bzero(p->pfik_ah_head, sizeof(*p->pfik_ah_head)); 706 TAILQ_INIT(p->pfik_ah_head); 707 TAILQ_INIT(&p->pfik_grouphead); 708 strlcpy(p->pfik_name, name, sizeof(p->pfik_name)); 709 RB_INIT(&p->pfik_lan_ext); 710 RB_INIT(&p->pfik_ext_gwy); 711 p->pfik_flags = flags; 712 p->pfik_parent = q; 713 p->pfik_tzero = time_second; 714 715 RB_INSERT(pfi_ifhead, &pfi_ifs, p); 716 if (q != NULL) { 717 q->pfik_addcnt++; 718 TAILQ_INSERT_TAIL(&q->pfik_grouphead, p, pfik_instances); 719 } 720 pfi_ifcnt++; 721 return (p); 722 } 723 724 int 725 pfi_maybe_destroy(struct pfi_kif *p) 726 { 727 int i, j, k; 728 struct pfi_kif *q = p->pfik_parent; 729 730 if ((p->pfik_flags & (PFI_IFLAG_ATTACHED | PFI_IFLAG_GROUP)) || 731 p->pfik_rules > 0 || p->pfik_states > 0) 732 if (!(p->pfik_flags & PFI_IFLAG_PLACEHOLDER)) 733 return (0); 734 735 crit_enter(); 736 if (q != NULL) { 737 for (i = 0; i < 2; i++) 738 for (j = 0; j < 2; j++) 739 for (k = 0; k < 2; k++) { 740 q->pfik_bytes[i][j][k] += 741 p->pfik_bytes[i][j][k]; 742 q->pfik_packets[i][j][k] += 743 p->pfik_packets[i][j][k]; 744 /* clear stats in case we return to the dummy group */ 745 p->pfik_bytes[i][j][k] = 0; 746 p->pfik_packets[i][j][k] = 0; 747 } 748 q->pfik_delcnt++; 749 TAILQ_REMOVE(&q->pfik_grouphead, p, pfik_instances); 750 } 751 if (p->pfik_rules > 0 || p->pfik_states > 0) { 752 /* move back to the dummy group */ 753 p->pfik_parent = pfi_dummy; 754 pfi_dummy->pfik_addcnt++; 755 TAILQ_INSERT_TAIL(&pfi_dummy->pfik_grouphead, p, 756 pfik_instances); 757 crit_exit(); 758 return (0); 759 } 760 pfi_ifcnt--; 761 RB_REMOVE(pfi_ifhead, &pfi_ifs, p); 762 crit_exit(); 763 764 free(p->pfik_ah_head, PFI_MTYPE); 765 free(p, PFI_MTYPE); 766 return (1); 767 } 768 769 void 770 pfi_copy_group(char *p, const char *q, int m) 771 { 772 while (m > 1 && *q && !(*q >= '0' && *q <= '9')) { 773 *p++ = *q++; 774 m--; 775 } 776 if (m > 0) 777 *p++ = '\0'; 778 } 779 780 void 781 pfi_dynamic_drivers(void) 782 { 783 struct ifnet *ifp; 784 785 /* 786 * For FreeBSD basically every interface is "dynamic" as we can unload 787 * modules e.g. 788 */ 789 TAILQ_FOREACH(ifp, &ifnet, if_link) { 790 if (ifp->if_dunit == IF_DUNIT_NONE) 791 continue; 792 pfi_newgroup(ifp->if_dname, PFI_IFLAG_DYNAMIC); 793 } 794 } 795 796 void 797 pfi_newgroup(const char *name, int flags) 798 { 799 struct pfi_kif *p; 800 801 p = pfi_lookup_if(name); 802 if (p == NULL) 803 p = pfi_if_create(name, pfi_self, PFI_IFLAG_GROUP); 804 if (p == NULL) { 805 printf("pfi_newgroup: cannot allocate '%s' group", name); 806 return; 807 } 808 p->pfik_flags |= flags; 809 } 810 811 void 812 pfi_fill_oldstatus(struct pf_status *pfs) 813 { 814 struct pfi_kif *p, key; 815 int i, j, k; 816 817 strlcpy(key.pfik_name, pfs->ifname, sizeof(key.pfik_name)); 818 crit_enter(); 819 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 820 if (p == NULL) { 821 crit_exit(); 822 return; 823 } 824 bzero(pfs->pcounters, sizeof(pfs->pcounters)); 825 bzero(pfs->bcounters, sizeof(pfs->bcounters)); 826 for (i = 0; i < 2; i++) 827 for (j = 0; j < 2; j++) 828 for (k = 0; k < 2; k++) { 829 pfs->pcounters[i][j][k] = 830 p->pfik_packets[i][j][k]; 831 pfs->bcounters[i][j] += 832 p->pfik_bytes[i][j][k]; 833 } 834 crit_exit(); 835 } 836 837 int 838 pfi_clr_istats(const char *name, int *nzero, int flags) 839 { 840 struct pfi_kif *p; 841 int n = 0; 842 long tzero = time_second; 843 844 crit_enter(); 845 ACCEPT_FLAGS(PFI_FLAG_GROUP|PFI_FLAG_INSTANCE); 846 RB_FOREACH(p, pfi_ifhead, &pfi_ifs) { 847 if (pfi_skip_if(name, p, flags)) 848 continue; 849 bzero(p->pfik_packets, sizeof(p->pfik_packets)); 850 bzero(p->pfik_bytes, sizeof(p->pfik_bytes)); 851 p->pfik_tzero = tzero; 852 n++; 853 } 854 crit_exit(); 855 if (nzero != NULL) 856 *nzero = n; 857 return (0); 858 } 859 860 int 861 pfi_get_ifaces(const char *name, struct pfi_if *buf, int *size, int flags) 862 { 863 struct pfi_kif *p; 864 int n = 0; 865 866 ACCEPT_FLAGS(PFI_FLAG_GROUP|PFI_FLAG_INSTANCE); 867 crit_enter(); 868 RB_FOREACH(p, pfi_ifhead, &pfi_ifs) { 869 if (pfi_skip_if(name, p, flags)) 870 continue; 871 if (*size > n++) { 872 if (!p->pfik_tzero) 873 p->pfik_tzero = boottime.tv_sec; 874 if (copyout(p, buf++, sizeof(*buf))) { 875 crit_exit(); 876 return (EFAULT); 877 } 878 } 879 } 880 crit_exit(); 881 *size = n; 882 return (0); 883 } 884 885 struct pfi_kif * 886 pfi_lookup_if(const char *name) 887 { 888 struct pfi_kif *p, key; 889 890 strlcpy(key.pfik_name, name, sizeof(key.pfik_name)); 891 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 892 return (p); 893 } 894 895 int 896 pfi_skip_if(const char *filter, struct pfi_kif *p, int f) 897 { 898 int n; 899 900 if ((p->pfik_flags & PFI_IFLAG_GROUP) && !(f & PFI_FLAG_GROUP)) 901 return (1); 902 if ((p->pfik_flags & PFI_IFLAG_INSTANCE) && !(f & PFI_FLAG_INSTANCE)) 903 return (1); 904 if (filter == NULL || !*filter) 905 return (0); 906 if (!strcmp(p->pfik_name, filter)) 907 return (0); /* exact match */ 908 n = strlen(filter); 909 if (n < 1 || n >= IFNAMSIZ) 910 return (1); /* sanity check */ 911 if (filter[n-1] >= '0' && filter[n-1] <= '9') 912 return (1); /* only do exact match in that case */ 913 if (strncmp(p->pfik_name, filter, n)) 914 return (1); /* prefix doesn't match */ 915 return (p->pfik_name[n] < '0' || p->pfik_name[n] > '9'); 916 } 917 918 /* from pf_print_state.c */ 919 int 920 pfi_unmask(void *addr) 921 { 922 struct pf_addr *m = addr; 923 int i = 31, j = 0, b = 0; 924 u_int32_t tmp; 925 926 while (j < 4 && m->addr32[j] == 0xffffffff) { 927 b += 32; 928 j++; 929 } 930 if (j < 4) { 931 tmp = ntohl(m->addr32[j]); 932 for (i = 31; tmp & (1 << i); --i) 933 b++; 934 } 935 return (b); 936 } 937 938 void 939 pfi_dohooks(struct pfi_kif *p) 940 { 941 for (; p != NULL; p = p->pfik_parent) 942 dohooks(p->pfik_ah_head, 0); 943 } 944 945 int 946 pfi_match_addr(struct pfi_dynaddr *dyn, struct pf_addr *a, sa_family_t af) 947 { 948 if (af == AF_INET) { 949 switch (dyn->pfid_acnt4) { 950 case 0: 951 return (0); 952 case 1: 953 return (PF_MATCHA(0, &dyn->pfid_addr4, 954 &dyn->pfid_mask4, a, AF_INET)); 955 default: 956 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET)); 957 } 958 } else { 959 switch (dyn->pfid_acnt6) { 960 case 0: 961 return (0); 962 case 1: 963 return (PF_MATCHA(0, &dyn->pfid_addr6, 964 &dyn->pfid_mask6, a, AF_INET6)); 965 default: 966 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET6)); 967 } 968 } 969 } 970