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 1.10 2008/03/07 11:34:20 sephe 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 = kmalloc(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 kfree(p->pfik_ah_head, PFI_MTYPE); 177 kfree(p, PFI_MTYPE); 178 } 179 kfree(pfi_index2kif, PFI_MTYPE); 180 kfree(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 = kmalloc(n, PFI_MTYPE, M_NOWAIT | M_ZERO); 254 if (np == NULL) 255 panic("pfi_attach_ifnet: " 256 "cannot allocate translation table"); 257 if (mp != NULL) 258 bcopy(mp, np, m); 259 pfi_index2kif = np; 260 if (mp != NULL) 261 kfree(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 crit_exit(); 321 } 322 323 void 324 pfi_detach_ifnet(struct ifnet *ifp) 325 { 326 struct pfi_kif *p, *q, key; 327 328 strlcpy(key.pfik_name, ifp->if_xname, sizeof(key.pfik_name)); 329 330 crit_enter(); 331 pfi_update++; 332 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 333 if (p == NULL) { 334 kprintf("pfi_detach_ifnet: cannot find %s", ifp->if_xname); 335 crit_exit(); 336 return; 337 } 338 EVENTHANDLER_DEREGISTER(ifaddr_event, p->pfik_ah_cookie); 339 q = p->pfik_parent; 340 p->pfik_ifp = NULL; 341 p->pfik_flags &= ~PFI_IFLAG_ATTACHED; 342 pfi_index2kif[ifp->if_index] = NULL; 343 pfi_dohooks(p); 344 pfi_maybe_destroy(p); 345 crit_exit(); 346 } 347 348 struct pfi_kif * 349 pfi_lookup_create(const char *name) 350 { 351 struct pfi_kif *p, *q, key; 352 353 crit_enter(); 354 p = pfi_lookup_if(name); 355 if (p == NULL) { 356 pfi_copy_group(key.pfik_name, name, sizeof(key.pfik_name)); 357 q = pfi_lookup_if(key.pfik_name); 358 if ((q != NULL) && (q->pfik_parent != pfi_dummy)) 359 p = pfi_if_create(name, q, PFI_IFLAG_INSTANCE); 360 else { 361 if (pfi_dummy == NULL) 362 panic("no 'notyet' dummy group"); 363 p = pfi_if_create(name, pfi_dummy, 364 PFI_IFLAG_PLACEHOLDER); 365 } 366 } 367 crit_exit(); 368 return (p); 369 } 370 371 struct pfi_kif * 372 pfi_attach_rule(const char *name) 373 { 374 struct pfi_kif *p; 375 376 p = pfi_lookup_create(name); 377 if (p != NULL) 378 p->pfik_rules++; 379 return (p); 380 } 381 382 void 383 pfi_detach_rule(struct pfi_kif *p) 384 { 385 if (p == NULL) 386 return; 387 if (p->pfik_rules > 0) 388 p->pfik_rules--; 389 else 390 kprintf("pfi_detach_rule: reference count at 0\n"); 391 pfi_maybe_destroy(p); 392 } 393 394 void 395 pfi_attach_state(struct pfi_kif *p) 396 { 397 if (!p->pfik_states++) 398 TAILQ_INSERT_TAIL(&pfi_statehead, p, pfik_w_states); 399 } 400 401 void 402 pfi_detach_state(struct pfi_kif *p) 403 { 404 if (p == NULL) 405 return; 406 if (p->pfik_states <= 0) { 407 kprintf("pfi_detach_state: reference count <= 0\n"); 408 return; 409 } 410 if (!--p->pfik_states) 411 TAILQ_REMOVE(&pfi_statehead, p, pfik_w_states); 412 pfi_maybe_destroy(p); 413 } 414 415 int 416 pfi_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af) 417 { 418 struct pfi_dynaddr *dyn; 419 char tblname[PF_TABLE_NAME_SIZE]; 420 struct pf_ruleset *ruleset = NULL; 421 int rv = 0; 422 423 if (aw->type != PF_ADDR_DYNIFTL) 424 return (0); 425 dyn = pool_get(&pfi_addr_pl, PR_NOWAIT); 426 if (dyn == NULL) 427 return (1); 428 bzero(dyn, sizeof(*dyn)); 429 430 crit_enter(); 431 dyn->pfid_kif = pfi_attach_rule(aw->v.ifname); 432 if (dyn->pfid_kif == NULL) 433 senderr(1); 434 435 dyn->pfid_net = pfi_unmask(&aw->v.a.mask); 436 if (af == AF_INET && dyn->pfid_net == 32) 437 dyn->pfid_net = 128; 438 strlcpy(tblname, aw->v.ifname, sizeof(tblname)); 439 if (aw->iflags & PFI_AFLAG_NETWORK) 440 strlcat(tblname, ":network", sizeof(tblname)); 441 if (aw->iflags & PFI_AFLAG_BROADCAST) 442 strlcat(tblname, ":broadcast", sizeof(tblname)); 443 if (aw->iflags & PFI_AFLAG_PEER) 444 strlcat(tblname, ":peer", sizeof(tblname)); 445 if (aw->iflags & PFI_AFLAG_NOALIAS) 446 strlcat(tblname, ":0", sizeof(tblname)); 447 if (dyn->pfid_net != 128) 448 ksnprintf(tblname + strlen(tblname), 449 sizeof(tblname) - strlen(tblname), "/%d", dyn->pfid_net); 450 ruleset = pf_find_or_create_ruleset(pfi_reserved_anchor, 451 pfi_interface_ruleset); 452 if (ruleset == NULL) 453 senderr(1); 454 455 dyn->pfid_kt = pfr_attach_table(ruleset, tblname); 456 if (dyn->pfid_kt == NULL) 457 senderr(1); 458 459 dyn->pfid_kt->pfrkt_flags |= PFR_TFLAG_ACTIVE; 460 dyn->pfid_iflags = aw->iflags; 461 dyn->pfid_af = af; 462 dyn->pfid_hook_cookie = hook_establish(dyn->pfid_kif->pfik_ah_head, 1, 463 pfi_dynaddr_update, dyn); 464 if (dyn->pfid_hook_cookie == NULL) 465 senderr(1); 466 467 aw->p.dyn = dyn; 468 pfi_dynaddr_update(aw->p.dyn); 469 crit_exit(); 470 return (0); 471 472 _bad: 473 if (dyn->pfid_kt != NULL) 474 pfr_detach_table(dyn->pfid_kt); 475 if (ruleset != NULL) 476 pf_remove_if_empty_ruleset(ruleset); 477 if (dyn->pfid_kif != NULL) 478 pfi_detach_rule(dyn->pfid_kif); 479 pool_put(&pfi_addr_pl, dyn); 480 crit_exit(); 481 return (rv); 482 } 483 484 void 485 pfi_dynaddr_update(void *p) 486 { 487 struct pfi_dynaddr *dyn = (struct pfi_dynaddr *)p; 488 struct pfi_kif *kif = dyn->pfid_kif; 489 struct pfr_ktable *kt = dyn->pfid_kt; 490 491 if (dyn == NULL || kif == NULL || kt == NULL) 492 panic("pfi_dynaddr_update"); 493 if (kt->pfrkt_larg != pfi_update) { 494 /* this table needs to be brought up-to-date */ 495 pfi_table_update(kt, kif, dyn->pfid_net, dyn->pfid_iflags); 496 kt->pfrkt_larg = pfi_update; 497 } 498 pfr_dynaddr_update(kt, dyn); 499 } 500 501 void 502 pfi_table_update(struct pfr_ktable *kt, struct pfi_kif *kif, int net, int flags) 503 { 504 int e, size2 = 0; 505 struct pfi_kif *p; 506 struct pfr_table t; 507 508 if ((kif->pfik_flags & PFI_IFLAG_INSTANCE) && kif->pfik_ifp == NULL) { 509 pfr_clr_addrs(&kt->pfrkt_t, NULL, 0); 510 return; 511 } 512 pfi_buffer_cnt = 0; 513 if ((kif->pfik_flags & PFI_IFLAG_INSTANCE)) 514 pfi_instance_add(kif->pfik_ifp, net, flags); 515 else if (strcmp(kif->pfik_name, "self")) { 516 TAILQ_FOREACH(p, &kif->pfik_grouphead, pfik_instances) 517 pfi_instance_add(p->pfik_ifp, net, flags); 518 } else { 519 RB_FOREACH(p, pfi_ifhead, &pfi_ifs) 520 if (p->pfik_flags & PFI_IFLAG_INSTANCE) 521 pfi_instance_add(p->pfik_ifp, net, flags); 522 } 523 t = kt->pfrkt_t; 524 t.pfrt_flags = 0; 525 if ((e = pfr_set_addrs(&t, pfi_buffer, pfi_buffer_cnt, &size2, 526 NULL, NULL, NULL, 0))) 527 kprintf("pfi_table_update: cannot set %d new addresses " 528 "into table %s: %d\n", pfi_buffer_cnt, kt->pfrkt_name, e); 529 } 530 531 void 532 pfi_instance_add(struct ifnet *ifp, int net, int flags) 533 { 534 struct ifaddr_container *ifac; 535 int got4 = 0, got6 = 0; 536 int net2, af; 537 538 if (ifp == NULL) 539 return; 540 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 541 struct ifaddr *ia = ifac->ifa; 542 543 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 kprintf("pfi_address_add: address buffer full (%d/%d)\n", 612 pfi_buffer_cnt, PFI_BUFFER_MAX); 613 return; 614 } 615 p = kmalloc(new_max * sizeof(*pfi_buffer), PFI_MTYPE, 616 M_NOWAIT); 617 if (p == NULL) { 618 kprintf("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 kfree(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 if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL || 652 aw->p.dyn->pfid_kif == NULL || aw->p.dyn->pfid_kt == NULL) 653 return; 654 655 crit_enter(); 656 hook_disestablish(aw->p.dyn->pfid_kif->pfik_ah_head, 657 aw->p.dyn->pfid_hook_cookie); 658 pfi_detach_rule(aw->p.dyn->pfid_kif); 659 aw->p.dyn->pfid_kif = NULL; 660 pfr_detach_table(aw->p.dyn->pfid_kt); 661 aw->p.dyn->pfid_kt = NULL; 662 pool_put(&pfi_addr_pl, aw->p.dyn); 663 aw->p.dyn = NULL; 664 crit_exit(); 665 } 666 667 void 668 pfi_dynaddr_copyout(struct pf_addr_wrap *aw) 669 { 670 if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL || 671 aw->p.dyn->pfid_kif == NULL) 672 return; 673 aw->p.dyncnt = aw->p.dyn->pfid_acnt4 + aw->p.dyn->pfid_acnt6; 674 } 675 676 void 677 pfi_kifaddr_update(void *v) 678 { 679 crit_enter(); 680 pfi_update++; 681 pfi_dohooks(v); 682 crit_exit(); 683 } 684 685 int 686 pfi_if_compare(struct pfi_kif *p, struct pfi_kif *q) 687 { 688 return (strncmp(p->pfik_name, q->pfik_name, IFNAMSIZ)); 689 } 690 691 struct pfi_kif * 692 pfi_if_create(const char *name, struct pfi_kif *q, int flags) 693 { 694 struct pfi_kif *p; 695 696 p = kmalloc(sizeof(*p), PFI_MTYPE, M_NOWAIT | M_ZERO); 697 if (p == NULL) 698 return (NULL); 699 p->pfik_ah_head = kmalloc(sizeof(*p->pfik_ah_head), PFI_MTYPE, 700 M_NOWAIT | M_ZERO); 701 if (p->pfik_ah_head == NULL) { 702 kfree(p, PFI_MTYPE); 703 return (NULL); 704 } 705 TAILQ_INIT(p->pfik_ah_head); 706 TAILQ_INIT(&p->pfik_grouphead); 707 strlcpy(p->pfik_name, name, sizeof(p->pfik_name)); 708 RB_INIT(&p->pfik_lan_ext); 709 RB_INIT(&p->pfik_ext_gwy); 710 p->pfik_flags = flags; 711 p->pfik_parent = q; 712 p->pfik_tzero = time_second; 713 714 RB_INSERT(pfi_ifhead, &pfi_ifs, p); 715 if (q != NULL) { 716 q->pfik_addcnt++; 717 TAILQ_INSERT_TAIL(&q->pfik_grouphead, p, pfik_instances); 718 } 719 pfi_ifcnt++; 720 return (p); 721 } 722 723 int 724 pfi_maybe_destroy(struct pfi_kif *p) 725 { 726 int i, j, k; 727 struct pfi_kif *q = p->pfik_parent; 728 729 if ((p->pfik_flags & (PFI_IFLAG_ATTACHED | PFI_IFLAG_GROUP)) || 730 p->pfik_rules > 0 || p->pfik_states > 0) 731 if (!(p->pfik_flags & PFI_IFLAG_PLACEHOLDER)) 732 return (0); 733 734 crit_enter(); 735 if (q != NULL) { 736 for (i = 0; i < 2; i++) 737 for (j = 0; j < 2; j++) 738 for (k = 0; k < 2; k++) { 739 q->pfik_bytes[i][j][k] += 740 p->pfik_bytes[i][j][k]; 741 q->pfik_packets[i][j][k] += 742 p->pfik_packets[i][j][k]; 743 /* clear stats in case we return to the dummy group */ 744 p->pfik_bytes[i][j][k] = 0; 745 p->pfik_packets[i][j][k] = 0; 746 } 747 q->pfik_delcnt++; 748 TAILQ_REMOVE(&q->pfik_grouphead, p, pfik_instances); 749 } 750 if (p->pfik_rules > 0 || p->pfik_states > 0) { 751 /* move back to the dummy group */ 752 p->pfik_parent = pfi_dummy; 753 pfi_dummy->pfik_addcnt++; 754 TAILQ_INSERT_TAIL(&pfi_dummy->pfik_grouphead, p, 755 pfik_instances); 756 crit_exit(); 757 return (0); 758 } 759 pfi_ifcnt--; 760 RB_REMOVE(pfi_ifhead, &pfi_ifs, p); 761 crit_exit(); 762 763 kfree(p->pfik_ah_head, PFI_MTYPE); 764 kfree(p, PFI_MTYPE); 765 return (1); 766 } 767 768 void 769 pfi_copy_group(char *p, const char *q, int m) 770 { 771 while (m > 1 && *q && !(*q >= '0' && *q <= '9')) { 772 *p++ = *q++; 773 m--; 774 } 775 if (m > 0) 776 *p++ = '\0'; 777 } 778 779 void 780 pfi_dynamic_drivers(void) 781 { 782 struct ifnet *ifp; 783 784 /* 785 * For FreeBSD basically every interface is "dynamic" as we can unload 786 * modules e.g. 787 */ 788 TAILQ_FOREACH(ifp, &ifnet, if_link) { 789 if (ifp->if_dunit == IF_DUNIT_NONE) 790 continue; 791 pfi_newgroup(ifp->if_dname, PFI_IFLAG_DYNAMIC); 792 } 793 } 794 795 void 796 pfi_newgroup(const char *name, int flags) 797 { 798 struct pfi_kif *p; 799 800 p = pfi_lookup_if(name); 801 if (p == NULL) 802 p = pfi_if_create(name, pfi_self, PFI_IFLAG_GROUP); 803 if (p == NULL) { 804 kprintf("pfi_newgroup: cannot allocate '%s' group", name); 805 return; 806 } 807 p->pfik_flags |= flags; 808 } 809 810 void 811 pfi_fill_oldstatus(struct pf_status *pfs) 812 { 813 struct pfi_kif *p, key; 814 int i, j, k; 815 816 strlcpy(key.pfik_name, pfs->ifname, sizeof(key.pfik_name)); 817 crit_enter(); 818 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 819 if (p == NULL) { 820 crit_exit(); 821 return; 822 } 823 bzero(pfs->pcounters, sizeof(pfs->pcounters)); 824 bzero(pfs->bcounters, sizeof(pfs->bcounters)); 825 for (i = 0; i < 2; i++) 826 for (j = 0; j < 2; j++) 827 for (k = 0; k < 2; k++) { 828 pfs->pcounters[i][j][k] = 829 p->pfik_packets[i][j][k]; 830 pfs->bcounters[i][j] += 831 p->pfik_bytes[i][j][k]; 832 } 833 crit_exit(); 834 } 835 836 int 837 pfi_clr_istats(const char *name, int *nzero, int flags) 838 { 839 struct pfi_kif *p; 840 int n = 0; 841 long tzero = time_second; 842 843 crit_enter(); 844 ACCEPT_FLAGS(PFI_FLAG_GROUP|PFI_FLAG_INSTANCE); 845 RB_FOREACH(p, pfi_ifhead, &pfi_ifs) { 846 if (pfi_skip_if(name, p, flags)) 847 continue; 848 bzero(p->pfik_packets, sizeof(p->pfik_packets)); 849 bzero(p->pfik_bytes, sizeof(p->pfik_bytes)); 850 p->pfik_tzero = tzero; 851 n++; 852 } 853 crit_exit(); 854 if (nzero != NULL) 855 *nzero = n; 856 return (0); 857 } 858 859 int 860 pfi_get_ifaces(const char *name, struct pfi_if *buf, int *size, int flags) 861 { 862 struct pfi_kif *p; 863 int n = 0; 864 865 ACCEPT_FLAGS(PFI_FLAG_GROUP|PFI_FLAG_INSTANCE); 866 crit_enter(); 867 RB_FOREACH(p, pfi_ifhead, &pfi_ifs) { 868 if (pfi_skip_if(name, p, flags)) 869 continue; 870 if (*size > n++) { 871 if (!p->pfik_tzero) 872 p->pfik_tzero = boottime.tv_sec; 873 if (copyout(p, buf++, sizeof(*buf))) { 874 crit_exit(); 875 return (EFAULT); 876 } 877 } 878 } 879 crit_exit(); 880 *size = n; 881 return (0); 882 } 883 884 struct pfi_kif * 885 pfi_lookup_if(const char *name) 886 { 887 struct pfi_kif *p, key; 888 889 strlcpy(key.pfik_name, name, sizeof(key.pfik_name)); 890 p = RB_FIND(pfi_ifhead, &pfi_ifs, &key); 891 return (p); 892 } 893 894 int 895 pfi_skip_if(const char *filter, struct pfi_kif *p, int f) 896 { 897 int n; 898 899 if ((p->pfik_flags & PFI_IFLAG_GROUP) && !(f & PFI_FLAG_GROUP)) 900 return (1); 901 if ((p->pfik_flags & PFI_IFLAG_INSTANCE) && !(f & PFI_FLAG_INSTANCE)) 902 return (1); 903 if (filter == NULL || !*filter) 904 return (0); 905 if (!strcmp(p->pfik_name, filter)) 906 return (0); /* exact match */ 907 n = strlen(filter); 908 if (n < 1 || n >= IFNAMSIZ) 909 return (1); /* sanity check */ 910 if (filter[n-1] >= '0' && filter[n-1] <= '9') 911 return (1); /* only do exact match in that case */ 912 if (strncmp(p->pfik_name, filter, n)) 913 return (1); /* prefix doesn't match */ 914 return (p->pfik_name[n] < '0' || p->pfik_name[n] > '9'); 915 } 916 917 /* from pf_print_state.c */ 918 int 919 pfi_unmask(void *addr) 920 { 921 struct pf_addr *m = addr; 922 int i = 31, j = 0, b = 0; 923 u_int32_t tmp; 924 925 while (j < 4 && m->addr32[j] == 0xffffffff) { 926 b += 32; 927 j++; 928 } 929 if (j < 4) { 930 tmp = ntohl(m->addr32[j]); 931 for (i = 31; tmp & (1 << i); --i) 932 b++; 933 } 934 return (b); 935 } 936 937 void 938 pfi_dohooks(struct pfi_kif *p) 939 { 940 for (; p != NULL; p = p->pfik_parent) 941 dohooks(p->pfik_ah_head, 0); 942 } 943 944 int 945 pfi_match_addr(struct pfi_dynaddr *dyn, struct pf_addr *a, sa_family_t af) 946 { 947 if (af == AF_INET) { 948 switch (dyn->pfid_acnt4) { 949 case 0: 950 return (0); 951 case 1: 952 return (PF_MATCHA(0, &dyn->pfid_addr4, 953 &dyn->pfid_mask4, a, AF_INET)); 954 default: 955 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET)); 956 } 957 } else { 958 switch (dyn->pfid_acnt6) { 959 case 0: 960 return (0); 961 case 1: 962 return (PF_MATCHA(0, &dyn->pfid_addr6, 963 &dyn->pfid_mask6, a, AF_INET6)); 964 default: 965 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET6)); 966 } 967 } 968 } 969