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 1.1 2004/09/19 22:32:47 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/time.h> 51 #include <vm/vm_zone.h> 52 53 #include <net/if.h> 54 #include <net/if_types.h> 55 56 #include <netinet/in.h> 57 #include <netinet/in_var.h> 58 #include <netinet/in_systm.h> 59 #include <netinet/ip.h> 60 #include <netinet/ip_var.h> 61 62 #include <net/pf/pfvar.h> 63 64 #ifdef INET6 65 #include <netinet/ip6.h> 66 #endif /* INET6 */ 67 68 #define ACCEPT_FLAGS(oklist) \ 69 do { \ 70 if ((flags & ~(oklist)) & \ 71 PFI_FLAG_ALLMASK) \ 72 return (EINVAL); \ 73 } while (0) 74 75 #define senderr(e) do { rv = (e); goto _bad; } while (0) 76 77 struct pfi_kif **pfi_index2kif; 78 struct pfi_kif *pfi_self, *pfi_dummy; 79 int pfi_indexlim; 80 struct pfi_ifhead pfi_ifs; 81 struct pfi_statehead pfi_statehead; 82 int pfi_ifcnt; 83 vm_zone_t pfi_addr_pl; 84 long pfi_update = 1; 85 struct pfr_addr *pfi_buffer; 86 int pfi_buffer_cnt; 87 int pfi_buffer_max; 88 char pfi_reserved_anchor[PF_ANCHOR_NAME_SIZE] = 89 PF_RESERVED_ANCHOR; 90 char pfi_interface_ruleset[PF_RULESET_NAME_SIZE] = 91 PF_INTERFACE_RULESET; 92 93 eventhandler_tag pfi_clone_cookie = NULL; 94 eventhandler_tag pfi_attach_cookie = NULL; 95 eventhandler_tag pfi_detach_cookie = NULL; 96 97 void pfi_dynaddr_update(void *); 98 void pfi_kifaddr_update(void *); 99 void pfi_table_update(struct pfr_ktable *, struct pfi_kif *, 100 int, int); 101 void pfi_instance_add(struct ifnet *, int, int); 102 void pfi_address_add(struct sockaddr *, int, int); 103 int pfi_if_compare(struct pfi_kif *, struct pfi_kif *); 104 struct pfi_kif *pfi_if_create(const char *, struct pfi_kif *, int); 105 void pfi_copy_group(char *, const char *, int); 106 void pfi_dynamic_drivers(void); 107 void pfi_newgroup(const char *, int); 108 int pfi_skip_if(const char *, struct pfi_kif *, int); 109 int pfi_unmask(void *); 110 void pfi_dohooks(struct pfi_kif *); 111 void pfi_kifaddr_update_event(void *, struct ifnet *); 112 void pfi_attach_clone_event(void *, struct if_clone *); 113 void pfi_attach_ifnet_event(void *, struct ifnet *); 114 void pfi_detach_ifnet_event(void *, struct ifnet *); 115 116 RB_PROTOTYPE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare); 117 RB_GENERATE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare); 118 119 #define PFI_DYNAMIC_BUSES { "pcmcia", "cardbus", "uhub" } 120 #define PFI_BUFFER_MAX 0x10000 121 MALLOC_DEFINE(PFI_MTYPE, "pf_if", "pf interface table"); 122 123 void 124 pfi_initialize(void) 125 { 126 struct ifnet *ifp; 127 128 if (pfi_self != NULL) /* already initialized */ 129 return; 130 131 TAILQ_INIT(&pfi_statehead); 132 pfi_buffer_max = 64; 133 pfi_buffer = malloc(pfi_buffer_max * sizeof(*pfi_buffer), 134 PFI_MTYPE, M_WAITOK); 135 pfi_self = pfi_if_create("self", NULL, PFI_IFLAG_GROUP); 136 pfi_dynamic_drivers(); 137 138 TAILQ_FOREACH(ifp, &ifnet, if_link) { 139 if (ifp->if_dunit != IF_DUNIT_NONE) 140 pfi_attach_ifnet(ifp); 141 } 142 pfi_dummy = pfi_if_create("notyet", pfi_self, 143 PFI_IFLAG_GROUP | PFI_IFLAG_DYNAMIC); 144 pfi_attach_cookie = EVENTHANDLER_REGISTER(ifnet_arrival_event, 145 pfi_attach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY); 146 pfi_detach_cookie = EVENTHANDLER_REGISTER(ifnet_departure_event, 147 pfi_detach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY); 148 pfi_clone_cookie = EVENTHANDLER_REGISTER(if_clone_event, 149 pfi_attach_clone_event, NULL, EVENTHANDLER_PRI_ANY); 150 } 151 152 void 153 pfi_cleanup(void) 154 { 155 struct pfi_kif *p, key; 156 struct ifnet *ifp; 157 158 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, pfi_attach_cookie); 159 EVENTHANDLER_DEREGISTER(ifnet_departure_event, pfi_detach_cookie); 160 EVENTHANDLER_DEREGISTER(if_clone_event, pfi_clone_cookie); 161 162 /* release PFI_IFLAG_INSTANCE */ 163 TAILQ_FOREACH(ifp, &ifnet, if_link) { 164 strlcpy(key.pfik_name, ifp->if_xname, sizeof(key.pfik_name)); 165 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 166 if (p != NULL) 167 pfi_detach_ifnet(ifp); 168 } 169 170 /* XXX clear all other interface group */ 171 while ((p = RB_MIN(pfi_ifhead, &pfi_ifs))) { 172 RB_REMOVE(pfi_ifhead, &pfi_ifs, p); 173 174 free(p->pfik_ah_head, PFI_MTYPE); 175 free(p, PFI_MTYPE); 176 } 177 free(pfi_index2kif, PFI_MTYPE); 178 free(pfi_buffer, PFI_MTYPE); 179 pfi_index2kif = NULL; 180 pfi_buffer = NULL; 181 pfi_self = NULL; 182 } 183 184 /* 185 * Wrapper functions for FreeBSD eventhandler 186 */ 187 void 188 pfi_kifaddr_update_event(void *arg, struct ifnet *ifp) 189 { 190 struct pfi_kif *p = arg; 191 192 /* 193 * Check to see if it is 'our' interface as we do not have per 194 * interface hooks and thus get an update for every interface. 195 */ 196 if (p && p->pfik_ifp == ifp) 197 pfi_kifaddr_update(p); 198 } 199 200 void 201 pfi_attach_clone_event(void *arg __unused, struct if_clone *ifc) 202 { 203 pfi_attach_clone(ifc); 204 } 205 206 void 207 pfi_attach_ifnet_event(void *arg __unused, struct ifnet *ifp) 208 { 209 if (ifp->if_dunit != IF_DUNIT_NONE) 210 pfi_attach_ifnet(ifp); 211 } 212 213 void 214 pfi_detach_ifnet_event(void *arg __unused, struct ifnet *ifp) 215 { 216 pfi_detach_ifnet(ifp); 217 } 218 219 void 220 pfi_attach_clone(struct if_clone *ifc) 221 { 222 pfi_initialize(); 223 pfi_newgroup(ifc->ifc_name, PFI_IFLAG_CLONABLE); 224 } 225 226 void 227 pfi_attach_ifnet(struct ifnet *ifp) 228 { 229 struct pfi_kif *p, *q, key; 230 int s; 231 int realname; 232 233 pfi_initialize(); 234 s = splsoftnet(); 235 pfi_update++; 236 if (ifp->if_index >= pfi_indexlim) { 237 /* 238 * grow pfi_index2kif, similar to ifindex2ifnet code in if.c 239 */ 240 size_t m, n, oldlim; 241 struct pfi_kif **mp, **np; 242 243 oldlim = pfi_indexlim; 244 if (pfi_indexlim == 0) 245 pfi_indexlim = 64; 246 while (ifp->if_index >= pfi_indexlim) 247 pfi_indexlim <<= 1; 248 249 m = oldlim * sizeof(struct pfi_kif *); 250 mp = pfi_index2kif; 251 n = pfi_indexlim * sizeof(struct pfi_kif *); 252 np = malloc(n, PFI_MTYPE, M_NOWAIT); 253 if (np == NULL) 254 panic("pfi_attach_ifnet: " 255 "cannot allocate translation table"); 256 bzero(np, n); 257 if (mp != NULL) 258 bcopy(mp, np, m); 259 pfi_index2kif = np; 260 if (mp != NULL) 261 free(mp, PFI_MTYPE); 262 } 263 264 strlcpy(key.pfik_name, ifp->if_xname, sizeof(key.pfik_name)); 265 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 266 /* some additional trickery for placeholders */ 267 if ((p == NULL) || (p->pfik_parent == pfi_dummy)) { 268 /* are we looking at a renamed instance or not? */ 269 pfi_copy_group(key.pfik_name, ifp->if_xname, 270 sizeof(key.pfik_name)); 271 realname = (strncmp(key.pfik_name, ifp->if_dname, 272 sizeof(key.pfik_name)) == 0); 273 /* add group */ 274 /* we can change if_xname, hence use if_dname as group id */ 275 pfi_copy_group(key.pfik_name, ifp->if_dname, 276 sizeof(key.pfik_name)); 277 q = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 278 if (q == NULL) 279 q = pfi_if_create(key.pfik_name, pfi_self, 280 PFI_IFLAG_GROUP|PFI_IFLAG_DYNAMIC); 281 else if (q->pfik_parent == pfi_dummy) { 282 q->pfik_parent = pfi_self; 283 q->pfik_flags = (PFI_IFLAG_GROUP | PFI_IFLAG_DYNAMIC); 284 } 285 if (q == NULL) 286 panic("pfi_attach_ifnet: " 287 "cannot allocate '%s' group", key.pfik_name); 288 289 /* add/modify interface */ 290 if (p == NULL) 291 p = pfi_if_create(ifp->if_xname, q, 292 realname?PFI_IFLAG_INSTANCE:PFI_IFLAG_PLACEHOLDER); 293 else { 294 /* remove from the dummy group */ 295 /* XXX: copy stats? We should not have any!!! */ 296 pfi_dummy->pfik_delcnt++; 297 TAILQ_REMOVE(&pfi_dummy->pfik_grouphead, p, 298 pfik_instances); 299 /* move to the right group */ 300 p->pfik_parent = q; 301 q->pfik_addcnt++; 302 TAILQ_INSERT_TAIL(&q->pfik_grouphead, p, 303 pfik_instances); 304 if (realname) { 305 p->pfik_flags &= ~PFI_IFLAG_PLACEHOLDER; 306 p->pfik_flags |= PFI_IFLAG_INSTANCE; 307 } 308 } 309 if (p == NULL) 310 panic("pfi_attach_ifnet: " 311 "cannot allocate '%s' interface", ifp->if_xname); 312 } else 313 q = p->pfik_parent; 314 p->pfik_ifp = ifp; 315 p->pfik_flags |= PFI_IFLAG_ATTACHED; 316 p->pfik_ah_cookie = EVENTHANDLER_REGISTER(ifaddr_event, 317 pfi_kifaddr_update_event, p, EVENTHANDLER_PRI_ANY); 318 pfi_index2kif[ifp->if_index] = p; 319 pfi_dohooks(p); 320 splx(s); 321 } 322 323 void 324 pfi_detach_ifnet(struct ifnet *ifp) 325 { 326 struct pfi_kif *p, *q, key; 327 int s; 328 329 strlcpy(key.pfik_name, ifp->if_xname, sizeof(key.pfik_name)); 330 331 s = splsoftnet(); 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 splx(s); 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 splx(s); 347 } 348 349 struct pfi_kif * 350 pfi_lookup_create(const char *name) 351 { 352 struct pfi_kif *p, *q, key; 353 int s; 354 355 s = splsoftnet(); 356 p = pfi_lookup_if(name); 357 if (p == NULL) { 358 pfi_copy_group(key.pfik_name, name, sizeof(key.pfik_name)); 359 q = pfi_lookup_if(key.pfik_name); 360 if ((q != NULL) && (q->pfik_parent != pfi_dummy)) 361 p = pfi_if_create(name, q, PFI_IFLAG_INSTANCE); 362 else { 363 if (pfi_dummy == NULL) 364 panic("no 'notyet' dummy group"); 365 p = pfi_if_create(name, pfi_dummy, 366 PFI_IFLAG_PLACEHOLDER); 367 } 368 } 369 splx(s); 370 return (p); 371 } 372 373 struct pfi_kif * 374 pfi_attach_rule(const char *name) 375 { 376 struct pfi_kif *p; 377 378 p = pfi_lookup_create(name); 379 if (p != NULL) 380 p->pfik_rules++; 381 return (p); 382 } 383 384 void 385 pfi_detach_rule(struct pfi_kif *p) 386 { 387 if (p == NULL) 388 return; 389 if (p->pfik_rules > 0) 390 p->pfik_rules--; 391 else 392 printf("pfi_detach_rule: reference count at 0\n"); 393 pfi_maybe_destroy(p); 394 } 395 396 void 397 pfi_attach_state(struct pfi_kif *p) 398 { 399 if (!p->pfik_states++) 400 TAILQ_INSERT_TAIL(&pfi_statehead, p, pfik_w_states); 401 } 402 403 void 404 pfi_detach_state(struct pfi_kif *p) 405 { 406 if (p == NULL) 407 return; 408 if (p->pfik_states <= 0) { 409 printf("pfi_detach_state: reference count <= 0\n"); 410 return; 411 } 412 if (!--p->pfik_states) 413 TAILQ_REMOVE(&pfi_statehead, p, pfik_w_states); 414 pfi_maybe_destroy(p); 415 } 416 417 int 418 pfi_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af) 419 { 420 struct pfi_dynaddr *dyn; 421 char tblname[PF_TABLE_NAME_SIZE]; 422 struct pf_ruleset *ruleset = NULL; 423 int s, rv = 0; 424 425 if (aw->type != PF_ADDR_DYNIFTL) 426 return (0); 427 dyn = pool_get(&pfi_addr_pl, PR_NOWAIT); 428 if (dyn == NULL) 429 return (1); 430 bzero(dyn, sizeof(*dyn)); 431 432 s = splsoftnet(); 433 dyn->pfid_kif = pfi_attach_rule(aw->v.ifname); 434 if (dyn->pfid_kif == NULL) 435 senderr(1); 436 437 dyn->pfid_net = pfi_unmask(&aw->v.a.mask); 438 if (af == AF_INET && dyn->pfid_net == 32) 439 dyn->pfid_net = 128; 440 strlcpy(tblname, aw->v.ifname, sizeof(tblname)); 441 if (aw->iflags & PFI_AFLAG_NETWORK) 442 strlcat(tblname, ":network", sizeof(tblname)); 443 if (aw->iflags & PFI_AFLAG_BROADCAST) 444 strlcat(tblname, ":broadcast", sizeof(tblname)); 445 if (aw->iflags & PFI_AFLAG_PEER) 446 strlcat(tblname, ":peer", sizeof(tblname)); 447 if (aw->iflags & PFI_AFLAG_NOALIAS) 448 strlcat(tblname, ":0", sizeof(tblname)); 449 if (dyn->pfid_net != 128) 450 snprintf(tblname + strlen(tblname), 451 sizeof(tblname) - strlen(tblname), "/%d", dyn->pfid_net); 452 ruleset = pf_find_or_create_ruleset(pfi_reserved_anchor, 453 pfi_interface_ruleset); 454 if (ruleset == NULL) 455 senderr(1); 456 457 dyn->pfid_kt = pfr_attach_table(ruleset, tblname); 458 if (dyn->pfid_kt == NULL) 459 senderr(1); 460 461 dyn->pfid_kt->pfrkt_flags |= PFR_TFLAG_ACTIVE; 462 dyn->pfid_iflags = aw->iflags; 463 dyn->pfid_af = af; 464 dyn->pfid_hook_cookie = hook_establish(dyn->pfid_kif->pfik_ah_head, 1, 465 pfi_dynaddr_update, dyn); 466 if (dyn->pfid_hook_cookie == NULL) 467 senderr(1); 468 469 aw->p.dyn = dyn; 470 pfi_dynaddr_update(aw->p.dyn); 471 splx(s); 472 return (0); 473 474 _bad: 475 if (dyn->pfid_kt != NULL) 476 pfr_detach_table(dyn->pfid_kt); 477 if (ruleset != NULL) 478 pf_remove_if_empty_ruleset(ruleset); 479 if (dyn->pfid_kif != NULL) 480 pfi_detach_rule(dyn->pfid_kif); 481 pool_put(&pfi_addr_pl, dyn); 482 splx(s); 483 return (rv); 484 } 485 486 void 487 pfi_dynaddr_update(void *p) 488 { 489 struct pfi_dynaddr *dyn = (struct pfi_dynaddr *)p; 490 struct pfi_kif *kif = dyn->pfid_kif; 491 struct pfr_ktable *kt = dyn->pfid_kt; 492 493 if (dyn == NULL || kif == NULL || kt == NULL) 494 panic("pfi_dynaddr_update"); 495 if (kt->pfrkt_larg != pfi_update) { 496 /* this table needs to be brought up-to-date */ 497 pfi_table_update(kt, kif, dyn->pfid_net, dyn->pfid_iflags); 498 kt->pfrkt_larg = pfi_update; 499 } 500 pfr_dynaddr_update(kt, dyn); 501 } 502 503 void 504 pfi_table_update(struct pfr_ktable *kt, struct pfi_kif *kif, int net, int flags) 505 { 506 int e, size2 = 0; 507 struct pfi_kif *p; 508 struct pfr_table t; 509 510 if ((kif->pfik_flags & PFI_IFLAG_INSTANCE) && kif->pfik_ifp == NULL) { 511 pfr_clr_addrs(&kt->pfrkt_t, NULL, 0); 512 return; 513 } 514 pfi_buffer_cnt = 0; 515 if ((kif->pfik_flags & PFI_IFLAG_INSTANCE)) 516 pfi_instance_add(kif->pfik_ifp, net, flags); 517 else if (strcmp(kif->pfik_name, "self")) { 518 TAILQ_FOREACH(p, &kif->pfik_grouphead, pfik_instances) 519 pfi_instance_add(p->pfik_ifp, net, flags); 520 } else { 521 RB_FOREACH(p, pfi_ifhead, &pfi_ifs) 522 if (p->pfik_flags & PFI_IFLAG_INSTANCE) 523 pfi_instance_add(p->pfik_ifp, net, flags); 524 } 525 t = kt->pfrkt_t; 526 t.pfrt_flags = 0; 527 if ((e = pfr_set_addrs(&t, pfi_buffer, pfi_buffer_cnt, &size2, 528 NULL, NULL, NULL, 0))) 529 printf("pfi_table_update: cannot set %d new addresses " 530 "into table %s: %d\n", pfi_buffer_cnt, kt->pfrkt_name, e); 531 } 532 533 void 534 pfi_instance_add(struct ifnet *ifp, int net, int flags) 535 { 536 struct ifaddr *ia; 537 int got4 = 0, got6 = 0; 538 int net2, af; 539 540 if (ifp == NULL) 541 return; 542 TAILQ_FOREACH(ia, &ifp->if_addrlist, ifa_list) { 543 if (ia->ifa_addr == NULL) 544 continue; 545 af = ia->ifa_addr->sa_family; 546 if (af != AF_INET && af != AF_INET6) 547 continue; 548 /* 549 * XXX: For point-to-point interfaces, (ifname:0) and IPv4, 550 * jump over address without a proper route to work 551 * around a problem with ppp not fully removing the 552 * address used during IPCP. 553 */ 554 if ((ifp->if_flags & IFF_POINTOPOINT) && 555 !(ia->ifa_flags & IFA_ROUTE) && 556 (flags & PFI_AFLAG_NOALIAS) && (af == AF_INET)) 557 continue; 558 if ((flags & PFI_AFLAG_BROADCAST) && af == AF_INET6) 559 continue; 560 if ((flags & PFI_AFLAG_BROADCAST) && 561 !(ifp->if_flags & IFF_BROADCAST)) 562 continue; 563 if ((flags & PFI_AFLAG_PEER) && 564 !(ifp->if_flags & IFF_POINTOPOINT)) 565 continue; 566 if ((flags & PFI_AFLAG_NETWORK) && af == AF_INET6 && 567 IN6_IS_ADDR_LINKLOCAL( 568 &((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr)) 569 continue; 570 if (flags & PFI_AFLAG_NOALIAS) { 571 if (af == AF_INET && got4) 572 continue; 573 if (af == AF_INET6 && got6) 574 continue; 575 } 576 if (af == AF_INET) 577 got4 = 1; 578 else 579 got6 = 1; 580 net2 = net; 581 if (net2 == 128 && (flags & PFI_AFLAG_NETWORK)) { 582 if (af == AF_INET) { 583 net2 = pfi_unmask(&((struct sockaddr_in *) 584 ia->ifa_netmask)->sin_addr); 585 } else { 586 net2 = pfi_unmask(&((struct sockaddr_in6 *) 587 ia->ifa_netmask)->sin6_addr); 588 } 589 } 590 if (af == AF_INET && net2 > 32) 591 net2 = 32; 592 if (flags & PFI_AFLAG_BROADCAST) 593 pfi_address_add(ia->ifa_broadaddr, af, net2); 594 else if (flags & PFI_AFLAG_PEER) 595 pfi_address_add(ia->ifa_dstaddr, af, net2); 596 else 597 pfi_address_add(ia->ifa_addr, af, net2); 598 } 599 } 600 601 void 602 pfi_address_add(struct sockaddr *sa, int af, int net) 603 { 604 struct pfr_addr *p; 605 int i; 606 607 if (pfi_buffer_cnt >= pfi_buffer_max) { 608 int new_max = pfi_buffer_max * 2; 609 610 if (new_max > PFI_BUFFER_MAX) { 611 printf("pfi_address_add: address buffer full (%d/%d)\n", 612 pfi_buffer_cnt, PFI_BUFFER_MAX); 613 return; 614 } 615 p = malloc(new_max * sizeof(*pfi_buffer), PFI_MTYPE, 616 M_NOWAIT); 617 if (p == NULL) { 618 printf("pfi_address_add: no memory to grow buffer " 619 "(%d/%d)\n", pfi_buffer_cnt, PFI_BUFFER_MAX); 620 return; 621 } 622 memcpy(pfi_buffer, p, pfi_buffer_cnt * sizeof(*pfi_buffer)); 623 /* no need to zero buffer */ 624 free(pfi_buffer, PFI_MTYPE); 625 pfi_buffer = p; 626 pfi_buffer_max = new_max; 627 } 628 if (af == AF_INET && net > 32) 629 net = 128; 630 p = pfi_buffer + pfi_buffer_cnt++; 631 bzero(p, sizeof(*p)); 632 p->pfra_af = af; 633 p->pfra_net = net; 634 if (af == AF_INET) 635 p->pfra_ip4addr = ((struct sockaddr_in *)sa)->sin_addr; 636 if (af == AF_INET6) { 637 p->pfra_ip6addr = ((struct sockaddr_in6 *)sa)->sin6_addr; 638 if (IN6_IS_ADDR_LINKLOCAL(&p->pfra_ip6addr)) 639 p->pfra_ip6addr.s6_addr16[1] = 0; 640 } 641 /* mask network address bits */ 642 if (net < 128) 643 ((caddr_t)p)[p->pfra_net/8] &= ~(0xFF >> (p->pfra_net%8)); 644 for (i = (p->pfra_net+7)/8; i < sizeof(p->pfra_u); i++) 645 ((caddr_t)p)[i] = 0; 646 } 647 648 void 649 pfi_dynaddr_remove(struct pf_addr_wrap *aw) 650 { 651 int s; 652 653 if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL || 654 aw->p.dyn->pfid_kif == NULL || aw->p.dyn->pfid_kt == NULL) 655 return; 656 657 s = splsoftnet(); 658 hook_disestablish(aw->p.dyn->pfid_kif->pfik_ah_head, 659 aw->p.dyn->pfid_hook_cookie); 660 pfi_detach_rule(aw->p.dyn->pfid_kif); 661 aw->p.dyn->pfid_kif = NULL; 662 pfr_detach_table(aw->p.dyn->pfid_kt); 663 aw->p.dyn->pfid_kt = NULL; 664 pool_put(&pfi_addr_pl, aw->p.dyn); 665 aw->p.dyn = NULL; 666 splx(s); 667 } 668 669 void 670 pfi_dynaddr_copyout(struct pf_addr_wrap *aw) 671 { 672 if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL || 673 aw->p.dyn->pfid_kif == NULL) 674 return; 675 aw->p.dyncnt = aw->p.dyn->pfid_acnt4 + aw->p.dyn->pfid_acnt6; 676 } 677 678 void 679 pfi_kifaddr_update(void *v) 680 { 681 int s; 682 683 s = splsoftnet(); 684 pfi_update++; 685 pfi_dohooks(v); 686 splx(s); 687 } 688 689 int 690 pfi_if_compare(struct pfi_kif *p, struct pfi_kif *q) 691 { 692 return (strncmp(p->pfik_name, q->pfik_name, IFNAMSIZ)); 693 } 694 695 struct pfi_kif * 696 pfi_if_create(const char *name, struct pfi_kif *q, int flags) 697 { 698 struct pfi_kif *p; 699 700 p = malloc(sizeof(*p), PFI_MTYPE, M_NOWAIT); 701 if (p == NULL) 702 return (NULL); 703 bzero(p, sizeof(*p)); 704 p->pfik_ah_head = malloc(sizeof(*p->pfik_ah_head), PFI_MTYPE, 705 M_NOWAIT); 706 if (p->pfik_ah_head == NULL) { 707 free(p, PFI_MTYPE); 708 return (NULL); 709 } 710 bzero(p->pfik_ah_head, sizeof(*p->pfik_ah_head)); 711 TAILQ_INIT(p->pfik_ah_head); 712 TAILQ_INIT(&p->pfik_grouphead); 713 strlcpy(p->pfik_name, name, sizeof(p->pfik_name)); 714 RB_INIT(&p->pfik_lan_ext); 715 RB_INIT(&p->pfik_ext_gwy); 716 p->pfik_flags = flags; 717 p->pfik_parent = q; 718 p->pfik_tzero = time_second; 719 720 RB_INSERT(pfi_ifhead, &pfi_ifs, p); 721 if (q != NULL) { 722 q->pfik_addcnt++; 723 TAILQ_INSERT_TAIL(&q->pfik_grouphead, p, pfik_instances); 724 } 725 pfi_ifcnt++; 726 return (p); 727 } 728 729 int 730 pfi_maybe_destroy(struct pfi_kif *p) 731 { 732 int i, j, k, s; 733 struct pfi_kif *q = p->pfik_parent; 734 735 if ((p->pfik_flags & (PFI_IFLAG_ATTACHED | PFI_IFLAG_GROUP)) || 736 p->pfik_rules > 0 || p->pfik_states > 0) 737 if (!(p->pfik_flags & PFI_IFLAG_PLACEHOLDER)) 738 return (0); 739 740 s = splsoftnet(); 741 if (q != NULL) { 742 for (i = 0; i < 2; i++) 743 for (j = 0; j < 2; j++) 744 for (k = 0; k < 2; k++) { 745 q->pfik_bytes[i][j][k] += 746 p->pfik_bytes[i][j][k]; 747 q->pfik_packets[i][j][k] += 748 p->pfik_packets[i][j][k]; 749 /* clear stats in case we return to the dummy group */ 750 p->pfik_bytes[i][j][k] = 0; 751 p->pfik_packets[i][j][k] = 0; 752 } 753 q->pfik_delcnt++; 754 TAILQ_REMOVE(&q->pfik_grouphead, p, pfik_instances); 755 } 756 if (p->pfik_rules > 0 || p->pfik_states > 0) { 757 /* move back to the dummy group */ 758 p->pfik_parent = pfi_dummy; 759 pfi_dummy->pfik_addcnt++; 760 TAILQ_INSERT_TAIL(&pfi_dummy->pfik_grouphead, p, 761 pfik_instances); 762 return (0); 763 } 764 pfi_ifcnt--; 765 RB_REMOVE(pfi_ifhead, &pfi_ifs, p); 766 splx(s); 767 768 free(p->pfik_ah_head, PFI_MTYPE); 769 free(p, PFI_MTYPE); 770 return (1); 771 } 772 773 void 774 pfi_copy_group(char *p, const char *q, int m) 775 { 776 while (m > 1 && *q && !(*q >= '0' && *q <= '9')) { 777 *p++ = *q++; 778 m--; 779 } 780 if (m > 0) 781 *p++ = '\0'; 782 } 783 784 void 785 pfi_dynamic_drivers(void) 786 { 787 struct ifnet *ifp; 788 789 /* 790 * For FreeBSD basically every interface is "dynamic" as we can unload 791 * modules e.g. 792 */ 793 TAILQ_FOREACH(ifp, &ifnet, if_link) { 794 if (ifp->if_dunit == IF_DUNIT_NONE) 795 continue; 796 pfi_newgroup(ifp->if_dname, PFI_IFLAG_DYNAMIC); 797 } 798 } 799 800 void 801 pfi_newgroup(const char *name, int flags) 802 { 803 struct pfi_kif *p; 804 805 p = pfi_lookup_if(name); 806 if (p == NULL) 807 p = pfi_if_create(name, pfi_self, PFI_IFLAG_GROUP); 808 if (p == NULL) { 809 printf("pfi_newgroup: cannot allocate '%s' group", name); 810 return; 811 } 812 p->pfik_flags |= flags; 813 } 814 815 void 816 pfi_fill_oldstatus(struct pf_status *pfs) 817 { 818 struct pfi_kif *p, key; 819 int i, j, k, s; 820 821 strlcpy(key.pfik_name, pfs->ifname, sizeof(key.pfik_name)); 822 s = splsoftnet(); 823 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 824 if (p == NULL) { 825 splx(s); 826 return; 827 } 828 bzero(pfs->pcounters, sizeof(pfs->pcounters)); 829 bzero(pfs->bcounters, sizeof(pfs->bcounters)); 830 for (i = 0; i < 2; i++) 831 for (j = 0; j < 2; j++) 832 for (k = 0; k < 2; k++) { 833 pfs->pcounters[i][j][k] = 834 p->pfik_packets[i][j][k]; 835 pfs->bcounters[i][j] += 836 p->pfik_bytes[i][j][k]; 837 } 838 splx(s); 839 } 840 841 int 842 pfi_clr_istats(const char *name, int *nzero, int flags) 843 { 844 struct pfi_kif *p; 845 int n = 0, s; 846 long tzero = time_second; 847 848 s = splsoftnet(); 849 ACCEPT_FLAGS(PFI_FLAG_GROUP|PFI_FLAG_INSTANCE); 850 RB_FOREACH(p, pfi_ifhead, &pfi_ifs) { 851 if (pfi_skip_if(name, p, flags)) 852 continue; 853 bzero(p->pfik_packets, sizeof(p->pfik_packets)); 854 bzero(p->pfik_bytes, sizeof(p->pfik_bytes)); 855 p->pfik_tzero = tzero; 856 n++; 857 } 858 splx(s); 859 if (nzero != NULL) 860 *nzero = n; 861 return (0); 862 } 863 864 int 865 pfi_get_ifaces(const char *name, struct pfi_if *buf, int *size, int flags) 866 { 867 struct pfi_kif *p; 868 int s, n = 0; 869 870 ACCEPT_FLAGS(PFI_FLAG_GROUP|PFI_FLAG_INSTANCE); 871 s = splsoftnet(); 872 RB_FOREACH(p, pfi_ifhead, &pfi_ifs) { 873 if (pfi_skip_if(name, p, flags)) 874 continue; 875 if (*size > n++) { 876 if (!p->pfik_tzero) 877 p->pfik_tzero = boottime.tv_sec; 878 if (copyout(p, buf++, sizeof(*buf))) { 879 splx(s); 880 return (EFAULT); 881 } 882 } 883 } 884 splx(s); 885 *size = n; 886 return (0); 887 } 888 889 struct pfi_kif * 890 pfi_lookup_if(const char *name) 891 { 892 struct pfi_kif *p, key; 893 894 strlcpy(key.pfik_name, name, sizeof(key.pfik_name)); 895 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 896 return (p); 897 } 898 899 int 900 pfi_skip_if(const char *filter, struct pfi_kif *p, int f) 901 { 902 int n; 903 904 if ((p->pfik_flags & PFI_IFLAG_GROUP) && !(f & PFI_FLAG_GROUP)) 905 return (1); 906 if ((p->pfik_flags & PFI_IFLAG_INSTANCE) && !(f & PFI_FLAG_INSTANCE)) 907 return (1); 908 if (filter == NULL || !*filter) 909 return (0); 910 if (!strcmp(p->pfik_name, filter)) 911 return (0); /* exact match */ 912 n = strlen(filter); 913 if (n < 1 || n >= IFNAMSIZ) 914 return (1); /* sanity check */ 915 if (filter[n-1] >= '0' && filter[n-1] <= '9') 916 return (1); /* only do exact match in that case */ 917 if (strncmp(p->pfik_name, filter, n)) 918 return (1); /* prefix doesn't match */ 919 return (p->pfik_name[n] < '0' || p->pfik_name[n] > '9'); 920 } 921 922 /* from pf_print_state.c */ 923 int 924 pfi_unmask(void *addr) 925 { 926 struct pf_addr *m = addr; 927 int i = 31, j = 0, b = 0; 928 u_int32_t tmp; 929 930 while (j < 4 && m->addr32[j] == 0xffffffff) { 931 b += 32; 932 j++; 933 } 934 if (j < 4) { 935 tmp = ntohl(m->addr32[j]); 936 for (i = 31; tmp & (1 << i); --i) 937 b++; 938 } 939 return (b); 940 } 941 942 void 943 pfi_dohooks(struct pfi_kif *p) 944 { 945 for (; p != NULL; p = p->pfik_parent) 946 dohooks(p->pfik_ah_head, 0); 947 } 948 949 int 950 pfi_match_addr(struct pfi_dynaddr *dyn, struct pf_addr *a, sa_family_t af) 951 { 952 if (af == AF_INET) { 953 switch (dyn->pfid_acnt4) { 954 case 0: 955 return (0); 956 case 1: 957 return (PF_MATCHA(0, &dyn->pfid_addr4, 958 &dyn->pfid_mask4, a, AF_INET)); 959 default: 960 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET)); 961 } 962 } else { 963 switch (dyn->pfid_acnt6) { 964 case 0: 965 return (0); 966 case 1: 967 return (PF_MATCHA(0, &dyn->pfid_addr6, 968 &dyn->pfid_mask6, a, AF_INET6)); 969 default: 970 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET6)); 971 } 972 } 973 } 974