Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if.c
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1 /*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD: releng/7.4/sys/net/if.c 215368 2010-11-16 04:40:03Z sobomax $ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 #include "opt_mac.h" 37 #include "opt_carp.h" 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <sys/conf.h> 42 #include <sys/malloc.h> 43 #include <sys/sbuf.h> 44 #include <sys/bus.h> 45 #include <sys/mbuf.h> 46 #include <sys/systm.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/sockio.h> 54 #include <sys/syslog.h> 55 #include <sys/sysctl.h> 56 #include <sys/taskqueue.h> 57 #include <sys/domain.h> 58 #include <sys/jail.h> 59 #include <machine/stdarg.h> 60 61 #include <net/if.h> 62 #include <net/if_clone.h> 63 #include <net/if_dl.h> 64 #include <net/if_types.h> 65 #include <net/if_var.h> 66 #include <net/radix.h> 67 #include <net/route.h> 68 69 #if defined(INET) || defined(INET6) 70 /*XXX*/ 71 #include <netinet/in.h> 72 #include <netinet/in_var.h> 73 #ifdef INET6 74 #include <netinet6/in6_var.h> 75 #include <netinet6/in6_ifattach.h> 76 #endif 77 #endif 78 #ifdef INET 79 #include <netinet/if_ether.h> 80 #endif 81 #ifdef DEV_CARP 82 #include <netinet/ip_carp.h> 83 #endif 84 85 #include <security/mac/mac_framework.h> 86 87 static int slowtimo_started; 88 89 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 90 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 91 92 TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen); 93 SYSCTL_UINT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 94 &ifqmaxlen, 0, "max send queue size"); 95 96 /* Log link state change events */ 97 static int log_link_state_change = 1; 98 99 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 100 &log_link_state_change, 0, 101 "log interface link state change events"); 102 103 void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 104 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 105 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 106 107 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 108 109 /* 110 * XXX: Style; these should be sorted alphabetically, and unprototyped 111 * static functions should be prototyped. Currently they are sorted by 112 * declaration order. 113 */ 114 static void if_attachdomain(void *); 115 static void if_attachdomain1(struct ifnet *); 116 static void if_purgemaddrs(struct ifnet *); 117 static int ifconf(u_long, caddr_t); 118 static void if_freemulti(struct ifmultiaddr *); 119 static void if_grow(void); 120 static void if_init(void *); 121 static void if_check(void *); 122 static void if_qflush(struct ifaltq *); 123 static void if_route(struct ifnet *, int flag, int fam); 124 static int if_setflag(struct ifnet *, int, int, int *, int); 125 static void if_slowtimo(void *); 126 static void if_unroute(struct ifnet *, int flag, int fam); 127 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 128 static int if_rtdel(struct radix_node *, void *); 129 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 130 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 131 static void if_start_deferred(void *context, int pending); 132 static void do_link_state_change(void *, int); 133 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 134 static int if_getgroupmembers(struct ifgroupreq *); 135 static void if_delgroups(struct ifnet *); 136 #ifdef INET6 137 /* 138 * XXX: declare here to avoid to include many inet6 related files.. 139 * should be more generalized? 140 */ 141 extern void nd6_setmtu(struct ifnet *); 142 #endif 143 144 int if_index = 0; 145 int ifqmaxlen = IFQ_MAXLEN; 146 struct ifnethead ifnet; /* depend on static init XXX */ 147 struct ifgrouphead ifg_head; 148 struct mtx ifnet_lock; 149 static if_com_alloc_t *if_com_alloc[256]; 150 static if_com_free_t *if_com_free[256]; 151 152 static int if_indexlim = 8; 153 static struct knlist ifklist; 154 155 /* 156 * Table of ifnet/cdev by index. Locked with ifnet_lock. 157 */ 158 static struct ifindex_entry *ifindex_table = NULL; 159 160 static void filt_netdetach(struct knote *kn); 161 static int filt_netdev(struct knote *kn, long hint); 162 163 static struct filterops netdev_filtops = 164 { 1, NULL, filt_netdetach, filt_netdev }; 165 166 /* 167 * System initialization 168 */ 169 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 170 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL); 171 172 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 173 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 174 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 175 176 struct ifnet * 177 ifnet_byindex(u_short idx) 178 { 179 struct ifnet *ifp; 180 181 IFNET_RLOCK(); 182 ifp = ifindex_table[idx].ife_ifnet; 183 IFNET_RUNLOCK(); 184 return (ifp); 185 } 186 187 static void 188 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 189 { 190 191 IFNET_WLOCK_ASSERT(); 192 193 ifindex_table[idx].ife_ifnet = ifp; 194 } 195 196 struct ifaddr * 197 ifaddr_byindex(u_short idx) 198 { 199 struct ifaddr *ifa; 200 201 IFNET_RLOCK(); 202 ifa = ifnet_byindex(idx)->if_addr; 203 IFNET_RUNLOCK(); 204 return (ifa); 205 } 206 207 struct cdev * 208 ifdev_byindex(u_short idx) 209 { 210 struct cdev *cdev; 211 212 IFNET_RLOCK(); 213 cdev = ifindex_table[idx].ife_dev; 214 IFNET_RUNLOCK(); 215 return (cdev); 216 } 217 218 static void 219 ifdev_setbyindex(u_short idx, struct cdev *cdev) 220 { 221 222 IFNET_WLOCK(); 223 ifindex_table[idx].ife_dev = cdev; 224 IFNET_WUNLOCK(); 225 } 226 227 static d_open_t netopen; 228 static d_close_t netclose; 229 static d_ioctl_t netioctl; 230 static d_kqfilter_t netkqfilter; 231 232 static struct cdevsw net_cdevsw = { 233 .d_version = D_VERSION, 234 .d_flags = D_NEEDGIANT, 235 .d_open = netopen, 236 .d_close = netclose, 237 .d_ioctl = netioctl, 238 .d_name = "net", 239 .d_kqfilter = netkqfilter, 240 }; 241 242 static int 243 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 244 { 245 return (0); 246 } 247 248 static int 249 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 250 { 251 return (0); 252 } 253 254 static int 255 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 256 { 257 struct ifnet *ifp; 258 int error, idx; 259 260 /* only support interface specific ioctls */ 261 if (IOCGROUP(cmd) != 'i') 262 return (EOPNOTSUPP); 263 idx = minor(dev); 264 if (idx == 0) { 265 /* 266 * special network device, not interface. 267 */ 268 if (cmd == SIOCGIFCONF) 269 return (ifconf(cmd, data)); /* XXX remove cmd */ 270 #ifdef __amd64__ 271 if (cmd == SIOCGIFCONF32) 272 return (ifconf(cmd, data)); /* XXX remove cmd */ 273 #endif 274 return (EOPNOTSUPP); 275 } 276 277 ifp = ifnet_byindex(idx); 278 if (ifp == NULL) 279 return (ENXIO); 280 281 error = ifhwioctl(cmd, ifp, data, td); 282 if (error == ENOIOCTL) 283 error = EOPNOTSUPP; 284 return (error); 285 } 286 287 static int 288 netkqfilter(struct cdev *dev, struct knote *kn) 289 { 290 struct knlist *klist; 291 struct ifnet *ifp; 292 int idx; 293 294 switch (kn->kn_filter) { 295 case EVFILT_NETDEV: 296 kn->kn_fop = &netdev_filtops; 297 break; 298 default: 299 return (EINVAL); 300 } 301 302 idx = minor(dev); 303 if (idx == 0) { 304 klist = &ifklist; 305 } else { 306 ifp = ifnet_byindex(idx); 307 if (ifp == NULL) 308 return (1); 309 klist = &ifp->if_klist; 310 } 311 312 kn->kn_hook = (caddr_t)klist; 313 314 knlist_add(klist, kn, 0); 315 316 return (0); 317 } 318 319 static void 320 filt_netdetach(struct knote *kn) 321 { 322 struct knlist *klist = (struct knlist *)kn->kn_hook; 323 324 knlist_remove(klist, kn, 0); 325 } 326 327 static int 328 filt_netdev(struct knote *kn, long hint) 329 { 330 struct knlist *klist = (struct knlist *)kn->kn_hook; 331 332 /* 333 * Currently NOTE_EXIT is abused to indicate device detach. 334 */ 335 if (hint == NOTE_EXIT) { 336 kn->kn_data = NOTE_LINKINV; 337 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 338 knlist_remove_inevent(klist, kn); 339 return (1); 340 } 341 if (hint != 0) 342 kn->kn_data = hint; /* current status */ 343 if (kn->kn_sfflags & hint) 344 kn->kn_fflags |= hint; 345 return (kn->kn_fflags != 0); 346 } 347 348 /* 349 * Network interface utility routines. 350 * 351 * Routines with ifa_ifwith* names take sockaddr *'s as 352 * parameters. 353 */ 354 355 /* ARGSUSED*/ 356 static void 357 if_init(void *dummy __unused) 358 { 359 360 IFNET_LOCK_INIT(); 361 TAILQ_INIT(&ifnet); 362 TAILQ_INIT(&ifg_head); 363 knlist_init(&ifklist, NULL, NULL, NULL, NULL); 364 if_grow(); /* create initial table */ 365 ifdev_setbyindex(0, make_dev(&net_cdevsw, 0, UID_ROOT, GID_WHEEL, 366 0600, "network")); 367 if_clone_init(); 368 } 369 370 static void 371 if_grow(void) 372 { 373 u_int n; 374 struct ifindex_entry *e; 375 376 if_indexlim <<= 1; 377 n = if_indexlim * sizeof(*e); 378 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 379 if (ifindex_table != NULL) { 380 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 381 free((caddr_t)ifindex_table, M_IFNET); 382 } 383 ifindex_table = e; 384 } 385 386 /* ARGSUSED*/ 387 static void 388 if_check(void *dummy __unused) 389 { 390 struct ifnet *ifp; 391 int s; 392 393 s = splimp(); 394 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 395 TAILQ_FOREACH(ifp, &ifnet, if_link) { 396 if (ifp->if_snd.ifq_maxlen == 0) { 397 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 398 ifp->if_snd.ifq_maxlen = ifqmaxlen; 399 } 400 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 401 if_printf(ifp, 402 "XXX: driver didn't initialize queue mtx\n"); 403 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 404 MTX_NETWORK_LOCK, MTX_DEF); 405 } 406 } 407 IFNET_RUNLOCK(); 408 splx(s); 409 410 /* 411 * If at least one interface added during boot uses 412 * if_watchdog then start the timer. 413 */ 414 if (slowtimo_started) 415 if_slowtimo(0); 416 } 417 418 /* 419 * Allocate a struct ifnet and an index for an interface. A layer 2 420 * common structure will also be allocated if an allocation routine is 421 * registered for the passed type. 422 */ 423 struct ifnet* 424 if_alloc(u_char type) 425 { 426 struct ifnet *ifp; 427 428 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 429 430 /* 431 * Try to find an empty slot below if_index. If we fail, take 432 * the next slot. 433 * 434 * XXX: should be locked! 435 */ 436 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) { 437 if (ifnet_byindex(ifp->if_index) == NULL) 438 break; 439 } 440 /* Catch if_index overflow. */ 441 if (ifp->if_index < 1) { 442 free(ifp, M_IFNET); 443 return (NULL); 444 } 445 if (ifp->if_index > if_index) 446 if_index = ifp->if_index; 447 if (if_index >= if_indexlim) 448 if_grow(); 449 450 ifp->if_type = type; 451 452 if (if_com_alloc[type] != NULL) { 453 ifp->if_l2com = if_com_alloc[type](type, ifp); 454 if (ifp->if_l2com == NULL) { 455 free(ifp, M_IFNET); 456 return (NULL); 457 } 458 } 459 IFNET_WLOCK(); 460 ifnet_setbyindex(ifp->if_index, ifp); 461 IFNET_WUNLOCK(); 462 IF_ADDR_LOCK_INIT(ifp); 463 464 return (ifp); 465 } 466 467 /* 468 * Free the struct ifnet, the associated index, and the layer 2 common 469 * structure if needed. All the work is done in if_free_type(). 470 * 471 * Do not add code to this function! Add it to if_free_type(). 472 */ 473 void 474 if_free(struct ifnet *ifp) 475 { 476 477 if_free_type(ifp, ifp->if_type); 478 } 479 480 /* 481 * Do the actual work of freeing a struct ifnet, associated index, and 482 * layer 2 common structure. This version should only be called by 483 * intefaces that switch their type after calling if_alloc(). 484 */ 485 void 486 if_free_type(struct ifnet *ifp, u_char type) 487 { 488 489 if (ifp != ifnet_byindex(ifp->if_index)) { 490 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 491 __func__); 492 return; 493 } 494 495 IFNET_WLOCK(); 496 ifnet_setbyindex(ifp->if_index, NULL); 497 498 /* XXX: should be locked with if_findindex() */ 499 while (if_index > 0 && ifnet_byindex(if_index) == NULL) 500 if_index--; 501 IFNET_WUNLOCK(); 502 503 if (if_com_free[type] != NULL) 504 if_com_free[type](ifp->if_l2com, type); 505 506 IF_ADDR_LOCK_DESTROY(ifp); 507 free(ifp, M_IFNET); 508 }; 509 510 /* 511 * Perform generic interface initalization tasks and attach the interface 512 * to the list of "active" interfaces. 513 * 514 * XXX: 515 * - The decision to return void and thus require this function to 516 * succeed is questionable. 517 * - We do more initialization here then is probably a good idea. 518 * Some of this should probably move to if_alloc(). 519 * - We should probably do more sanity checking. For instance we don't 520 * do anything to insure if_xname is unique or non-empty. 521 */ 522 void 523 if_attach(struct ifnet *ifp) 524 { 525 unsigned socksize, ifasize; 526 int namelen, masklen; 527 struct sockaddr_dl *sdl; 528 struct ifaddr *ifa; 529 530 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 531 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 532 ifp->if_xname); 533 534 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 535 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 536 IF_AFDATA_LOCK_INIT(ifp); 537 ifp->if_afdata_initialized = 0; 538 539 TAILQ_INIT(&ifp->if_addrhead); 540 TAILQ_INIT(&ifp->if_prefixhead); 541 TAILQ_INIT(&ifp->if_multiaddrs); 542 TAILQ_INIT(&ifp->if_groups); 543 544 if_addgroup(ifp, IFG_ALL); 545 546 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 547 getmicrotime(&ifp->if_lastchange); 548 ifp->if_data.ifi_epoch = time_uptime; 549 ifp->if_data.ifi_datalen = sizeof(struct if_data); 550 551 #ifdef MAC 552 mac_init_ifnet(ifp); 553 mac_create_ifnet(ifp); 554 #endif 555 556 ifdev_setbyindex(ifp->if_index, make_dev(&net_cdevsw, 557 unit2minor(ifp->if_index), UID_ROOT, GID_WHEEL, 0600, "%s/%s", 558 net_cdevsw.d_name, ifp->if_xname)); 559 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 560 net_cdevsw.d_name, ifp->if_index); 561 562 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 563 564 /* 565 * create a Link Level name for this device 566 */ 567 namelen = strlen(ifp->if_xname); 568 /* 569 * Always save enough space for any possiable name so we can do 570 * a rename in place later. 571 */ 572 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 573 socksize = masklen + ifp->if_addrlen; 574 if (socksize < sizeof(*sdl)) 575 socksize = sizeof(*sdl); 576 socksize = roundup2(socksize, sizeof(long)); 577 ifasize = sizeof(*ifa) + 2 * socksize; 578 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 579 IFA_LOCK_INIT(ifa); 580 sdl = (struct sockaddr_dl *)(ifa + 1); 581 sdl->sdl_len = socksize; 582 sdl->sdl_family = AF_LINK; 583 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 584 sdl->sdl_nlen = namelen; 585 sdl->sdl_index = ifp->if_index; 586 sdl->sdl_type = ifp->if_type; 587 ifp->if_addr = ifa; 588 ifa->ifa_ifp = ifp; 589 ifa->ifa_rtrequest = link_rtrequest; 590 ifa->ifa_addr = (struct sockaddr *)sdl; 591 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 592 ifa->ifa_netmask = (struct sockaddr *)sdl; 593 sdl->sdl_len = masklen; 594 while (namelen != 0) 595 sdl->sdl_data[--namelen] = 0xff; 596 ifa->ifa_refcnt = 1; 597 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 598 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 599 ifp->if_snd.altq_type = 0; 600 ifp->if_snd.altq_disc = NULL; 601 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 602 ifp->if_snd.altq_tbr = NULL; 603 ifp->if_snd.altq_ifp = ifp; 604 605 IFNET_WLOCK(); 606 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 607 IFNET_WUNLOCK(); 608 609 if (domain_init_status >= 2) 610 if_attachdomain1(ifp); 611 612 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 613 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 614 615 /* Announce the interface. */ 616 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 617 618 if (ifp->if_watchdog != NULL) { 619 if_printf(ifp, 620 "WARNING: using obsoleted if_watchdog interface\n"); 621 622 /* 623 * Note that we need if_slowtimo(). If this happens after 624 * boot, then call if_slowtimo() directly. 625 */ 626 if (atomic_cmpset_int(&slowtimo_started, 0, 1) && !cold) 627 if_slowtimo(0); 628 } 629 if (ifp->if_flags & IFF_NEEDSGIANT) 630 if_printf(ifp, 631 "WARNING: using obsoleted IFF_NEEDSGIANT flag\n"); 632 } 633 634 static void 635 if_attachdomain(void *dummy) 636 { 637 struct ifnet *ifp; 638 int s; 639 640 s = splnet(); 641 TAILQ_FOREACH(ifp, &ifnet, if_link) 642 if_attachdomain1(ifp); 643 splx(s); 644 } 645 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 646 if_attachdomain, NULL); 647 648 static void 649 if_attachdomain1(struct ifnet *ifp) 650 { 651 struct domain *dp; 652 int s; 653 654 s = splnet(); 655 656 /* 657 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 658 * cannot lock ifp->if_afdata initialization, entirely. 659 */ 660 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 661 splx(s); 662 return; 663 } 664 if (ifp->if_afdata_initialized >= domain_init_status) { 665 IF_AFDATA_UNLOCK(ifp); 666 splx(s); 667 printf("if_attachdomain called more than once on %s\n", 668 ifp->if_xname); 669 return; 670 } 671 ifp->if_afdata_initialized = domain_init_status; 672 IF_AFDATA_UNLOCK(ifp); 673 674 /* address family dependent data region */ 675 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 676 for (dp = domains; dp; dp = dp->dom_next) { 677 if (dp->dom_ifattach) 678 ifp->if_afdata[dp->dom_family] = 679 (*dp->dom_ifattach)(ifp); 680 } 681 682 splx(s); 683 } 684 685 /* 686 * Remove any unicast or broadcast network addresses from an interface. 687 */ 688 void 689 if_purgeaddrs(struct ifnet *ifp) 690 { 691 struct ifaddr *ifa, *next; 692 693 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 694 if (ifa->ifa_addr->sa_family == AF_LINK) 695 continue; 696 #ifdef INET 697 /* XXX: Ugly!! ad hoc just for INET */ 698 if (ifa->ifa_addr->sa_family == AF_INET) { 699 struct ifaliasreq ifr; 700 701 bzero(&ifr, sizeof(ifr)); 702 ifr.ifra_addr = *ifa->ifa_addr; 703 if (ifa->ifa_dstaddr) 704 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 705 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 706 NULL) == 0) 707 continue; 708 } 709 #endif /* INET */ 710 #ifdef INET6 711 if (ifa->ifa_addr->sa_family == AF_INET6) { 712 in6_purgeaddr(ifa); 713 /* ifp_addrhead is already updated */ 714 continue; 715 } 716 #endif /* INET6 */ 717 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 718 IFAFREE(ifa); 719 } 720 } 721 722 /* 723 * Remove any multicast network addresses from an interface. 724 */ 725 static void 726 if_purgemaddrs(struct ifnet *ifp) 727 { 728 struct ifmultiaddr *ifma; 729 struct ifmultiaddr *next; 730 731 IF_ADDR_LOCK(ifp); 732 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 733 if_delmulti_locked(ifp, ifma, 1); 734 IF_ADDR_UNLOCK(ifp); 735 } 736 737 /* 738 * Detach an interface, removing it from the 739 * list of "active" interfaces. 740 * 741 * XXXRW: There are some significant questions about event ordering, and 742 * how to prevent things from starting to use the interface during detach. 743 */ 744 void 745 if_detach(struct ifnet *ifp) 746 { 747 struct ifaddr *ifa; 748 struct radix_node_head *rnh; 749 int s; 750 int i; 751 struct domain *dp; 752 struct ifnet *iter; 753 int found = 0; 754 755 IFNET_WLOCK(); 756 TAILQ_FOREACH(iter, &ifnet, if_link) 757 if (iter == ifp) { 758 TAILQ_REMOVE(&ifnet, ifp, if_link); 759 found = 1; 760 break; 761 } 762 IFNET_WUNLOCK(); 763 if (!found) 764 return; 765 766 /* 767 * Remove/wait for pending events. 768 */ 769 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 770 771 /* 772 * Remove routes and flush queues. 773 */ 774 s = splnet(); 775 if_down(ifp); 776 #ifdef ALTQ 777 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 778 altq_disable(&ifp->if_snd); 779 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 780 altq_detach(&ifp->if_snd); 781 #endif 782 783 if_purgeaddrs(ifp); 784 785 #ifdef INET 786 in_ifdetach(ifp); 787 #endif 788 789 #ifdef INET6 790 /* 791 * Remove all IPv6 kernel structs related to ifp. This should be done 792 * before removing routing entries below, since IPv6 interface direct 793 * routes are expected to be removed by the IPv6-specific kernel API. 794 * Otherwise, the kernel will detect some inconsistency and bark it. 795 */ 796 in6_ifdetach(ifp); 797 #endif 798 if_purgemaddrs(ifp); 799 800 /* 801 * Remove link ifaddr pointer and maybe decrement if_index. 802 * Clean up all addresses. 803 */ 804 ifp->if_addr = NULL; 805 destroy_dev(ifdev_byindex(ifp->if_index)); 806 ifdev_setbyindex(ifp->if_index, NULL); 807 808 /* We can now free link ifaddr. */ 809 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 810 ifa = TAILQ_FIRST(&ifp->if_addrhead); 811 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 812 IFAFREE(ifa); 813 } 814 815 /* 816 * Delete all remaining routes using this interface 817 * Unfortuneatly the only way to do this is to slog through 818 * the entire routing table looking for routes which point 819 * to this interface...oh well... 820 */ 821 for (i = 1; i <= AF_MAX; i++) { 822 int j; 823 for (j = 0; j < rt_numfibs; j++) { 824 if ((rnh = rt_tables[j][i]) == NULL) 825 continue; 826 RADIX_NODE_HEAD_LOCK(rnh); 827 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 828 RADIX_NODE_HEAD_UNLOCK(rnh); 829 } 830 } 831 832 /* Announce that the interface is gone. */ 833 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 834 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 835 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 836 if_delgroups(ifp); 837 838 IF_AFDATA_LOCK(ifp); 839 for (dp = domains; dp; dp = dp->dom_next) { 840 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 841 (*dp->dom_ifdetach)(ifp, 842 ifp->if_afdata[dp->dom_family]); 843 } 844 IF_AFDATA_UNLOCK(ifp); 845 846 #ifdef MAC 847 mac_destroy_ifnet(ifp); 848 #endif /* MAC */ 849 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 850 knlist_clear(&ifp->if_klist, 0); 851 knlist_destroy(&ifp->if_klist); 852 mtx_destroy(&ifp->if_snd.ifq_mtx); 853 IF_AFDATA_DESTROY(ifp); 854 splx(s); 855 } 856 857 /* 858 * Add a group to an interface 859 */ 860 int 861 if_addgroup(struct ifnet *ifp, const char *groupname) 862 { 863 struct ifg_list *ifgl; 864 struct ifg_group *ifg = NULL; 865 struct ifg_member *ifgm; 866 867 if (groupname[0] && groupname[strlen(groupname) - 1] >= '' && 868 groupname[strlen(groupname) - 1] <= '9') 869 return (EINVAL); 870 871 IFNET_WLOCK(); 872 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 873 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 874 IFNET_WUNLOCK(); 875 return (EEXIST); 876 } 877 878 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 879 M_NOWAIT)) == NULL) { 880 IFNET_WUNLOCK(); 881 return (ENOMEM); 882 } 883 884 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 885 M_TEMP, M_NOWAIT)) == NULL) { 886 free(ifgl, M_TEMP); 887 IFNET_WUNLOCK(); 888 return (ENOMEM); 889 } 890 891 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 892 if (!strcmp(ifg->ifg_group, groupname)) 893 break; 894 895 if (ifg == NULL) { 896 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 897 M_TEMP, M_NOWAIT)) == NULL) { 898 free(ifgl, M_TEMP); 899 free(ifgm, M_TEMP); 900 IFNET_WUNLOCK(); 901 return (ENOMEM); 902 } 903 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 904 ifg->ifg_refcnt = 0; 905 TAILQ_INIT(&ifg->ifg_members); 906 EVENTHANDLER_INVOKE(group_attach_event, ifg); 907 TAILQ_INSERT_TAIL(&ifg_head, ifg, ifg_next); 908 } 909 910 ifg->ifg_refcnt++; 911 ifgl->ifgl_group = ifg; 912 ifgm->ifgm_ifp = ifp; 913 914 IF_ADDR_LOCK(ifp); 915 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 916 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 917 IF_ADDR_UNLOCK(ifp); 918 919 IFNET_WUNLOCK(); 920 921 EVENTHANDLER_INVOKE(group_change_event, groupname); 922 923 return (0); 924 } 925 926 /* 927 * Remove a group from an interface 928 */ 929 int 930 if_delgroup(struct ifnet *ifp, const char *groupname) 931 { 932 struct ifg_list *ifgl; 933 struct ifg_member *ifgm; 934 935 IFNET_WLOCK(); 936 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 937 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 938 break; 939 if (ifgl == NULL) { 940 IFNET_WUNLOCK(); 941 return (ENOENT); 942 } 943 944 IF_ADDR_LOCK(ifp); 945 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 946 IF_ADDR_UNLOCK(ifp); 947 948 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 949 if (ifgm->ifgm_ifp == ifp) 950 break; 951 952 if (ifgm != NULL) { 953 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 954 free(ifgm, M_TEMP); 955 } 956 957 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 958 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next); 959 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 960 free(ifgl->ifgl_group, M_TEMP); 961 } 962 IFNET_WUNLOCK(); 963 964 free(ifgl, M_TEMP); 965 966 EVENTHANDLER_INVOKE(group_change_event, groupname); 967 968 return (0); 969 } 970 971 /* 972 * Remove an interface from all groups 973 */ 974 static void 975 if_delgroups(struct ifnet *ifp) 976 { 977 struct ifg_list *ifgl; 978 struct ifg_member *ifgm; 979 char groupname[IFNAMSIZ]; 980 981 IFNET_WLOCK(); 982 while (!TAILQ_EMPTY(&ifp->if_groups)) { 983 ifgl = TAILQ_FIRST(&ifp->if_groups); 984 985 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 986 987 IF_ADDR_LOCK(ifp); 988 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 989 IF_ADDR_UNLOCK(ifp); 990 991 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 992 if (ifgm->ifgm_ifp == ifp) 993 break; 994 995 if (ifgm != NULL) { 996 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 997 ifgm_next); 998 free(ifgm, M_TEMP); 999 } 1000 1001 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1002 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next); 1003 EVENTHANDLER_INVOKE(group_detach_event, 1004 ifgl->ifgl_group); 1005 free(ifgl->ifgl_group, M_TEMP); 1006 } 1007 IFNET_WUNLOCK(); 1008 1009 free(ifgl, M_TEMP); 1010 1011 EVENTHANDLER_INVOKE(group_change_event, groupname); 1012 1013 IFNET_WLOCK(); 1014 } 1015 IFNET_WUNLOCK(); 1016 } 1017 1018 /* 1019 * Stores all groups from an interface in memory pointed 1020 * to by data 1021 */ 1022 static int 1023 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1024 { 1025 int len, error; 1026 struct ifg_list *ifgl; 1027 struct ifg_req ifgrq, *ifgp; 1028 struct ifgroupreq *ifgr = data; 1029 1030 if (ifgr->ifgr_len == 0) { 1031 IF_ADDR_LOCK(ifp); 1032 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1033 ifgr->ifgr_len += sizeof(struct ifg_req); 1034 IF_ADDR_UNLOCK(ifp); 1035 return (0); 1036 } 1037 1038 len = ifgr->ifgr_len; 1039 ifgp = ifgr->ifgr_groups; 1040 /* XXX: wire */ 1041 IF_ADDR_LOCK(ifp); 1042 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1043 if (len < sizeof(ifgrq)) { 1044 IF_ADDR_UNLOCK(ifp); 1045 return (EINVAL); 1046 } 1047 bzero(&ifgrq, sizeof ifgrq); 1048 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1049 sizeof(ifgrq.ifgrq_group)); 1050 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1051 IF_ADDR_UNLOCK(ifp); 1052 return (error); 1053 } 1054 len -= sizeof(ifgrq); 1055 ifgp++; 1056 } 1057 IF_ADDR_UNLOCK(ifp); 1058 1059 return (0); 1060 } 1061 1062 /* 1063 * Stores all members of a group in memory pointed to by data 1064 */ 1065 static int 1066 if_getgroupmembers(struct ifgroupreq *data) 1067 { 1068 struct ifgroupreq *ifgr = data; 1069 struct ifg_group *ifg; 1070 struct ifg_member *ifgm; 1071 struct ifg_req ifgrq, *ifgp; 1072 int len, error; 1073 1074 IFNET_RLOCK(); 1075 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 1076 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1077 break; 1078 if (ifg == NULL) { 1079 IFNET_RUNLOCK(); 1080 return (ENOENT); 1081 } 1082 1083 if (ifgr->ifgr_len == 0) { 1084 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1085 ifgr->ifgr_len += sizeof(ifgrq); 1086 IFNET_RUNLOCK(); 1087 return (0); 1088 } 1089 1090 len = ifgr->ifgr_len; 1091 ifgp = ifgr->ifgr_groups; 1092 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1093 if (len < sizeof(ifgrq)) { 1094 IFNET_RUNLOCK(); 1095 return (EINVAL); 1096 } 1097 bzero(&ifgrq, sizeof ifgrq); 1098 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1099 sizeof(ifgrq.ifgrq_member)); 1100 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1101 IFNET_RUNLOCK(); 1102 return (error); 1103 } 1104 len -= sizeof(ifgrq); 1105 ifgp++; 1106 } 1107 IFNET_RUNLOCK(); 1108 1109 return (0); 1110 } 1111 1112 /* 1113 * Delete Routes for a Network Interface 1114 * 1115 * Called for each routing entry via the rnh->rnh_walktree() call above 1116 * to delete all route entries referencing a detaching network interface. 1117 * 1118 * Arguments: 1119 * rn pointer to node in the routing table 1120 * arg argument passed to rnh->rnh_walktree() - detaching interface 1121 * 1122 * Returns: 1123 * 0 successful 1124 * errno failed - reason indicated 1125 * 1126 */ 1127 static int 1128 if_rtdel(struct radix_node *rn, void *arg) 1129 { 1130 struct rtentry *rt = (struct rtentry *)rn; 1131 struct ifnet *ifp = arg; 1132 int err; 1133 1134 if (rt->rt_ifp == ifp) { 1135 1136 /* 1137 * Protect (sorta) against walktree recursion problems 1138 * with cloned routes 1139 */ 1140 if ((rt->rt_flags & RTF_UP) == 0) 1141 return (0); 1142 1143 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1144 rt_mask(rt), rt->rt_flags, 1145 (struct rtentry **) NULL, rt->rt_fibnum); 1146 if (err) { 1147 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1148 } 1149 } 1150 1151 return (0); 1152 } 1153 1154 /* 1155 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1156 * structs used to represent other address families, it is necessary 1157 * to perform a different comparison. 1158 */ 1159 1160 #define sa_equal(a1, a2) \ 1161 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1162 1163 #define sa_dl_equal(a1, a2) \ 1164 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1165 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1166 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1167 LLADDR((struct sockaddr_dl *)(a2)), \ 1168 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1169 1170 /* 1171 * Locate an interface based on a complete address. 1172 */ 1173 /*ARGSUSED*/ 1174 struct ifaddr * 1175 ifa_ifwithaddr(struct sockaddr *addr) 1176 { 1177 struct ifnet *ifp; 1178 struct ifaddr *ifa; 1179 1180 IFNET_RLOCK(); 1181 TAILQ_FOREACH(ifp, &ifnet, if_link) 1182 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1183 if (ifa->ifa_addr->sa_family != addr->sa_family) 1184 continue; 1185 if (sa_equal(addr, ifa->ifa_addr)) 1186 goto done; 1187 /* IP6 doesn't have broadcast */ 1188 if ((ifp->if_flags & IFF_BROADCAST) && 1189 ifa->ifa_broadaddr && 1190 ifa->ifa_broadaddr->sa_len != 0 && 1191 sa_equal(ifa->ifa_broadaddr, addr)) 1192 goto done; 1193 } 1194 ifa = NULL; 1195 done: 1196 IFNET_RUNLOCK(); 1197 return (ifa); 1198 } 1199 1200 /* 1201 * Locate an interface based on the broadcast address. 1202 */ 1203 /* ARGSUSED */ 1204 struct ifaddr * 1205 ifa_ifwithbroadaddr(struct sockaddr *addr) 1206 { 1207 struct ifnet *ifp; 1208 struct ifaddr *ifa; 1209 1210 IFNET_RLOCK(); 1211 TAILQ_FOREACH(ifp, &ifnet, if_link) 1212 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1213 if (ifa->ifa_addr->sa_family != addr->sa_family) 1214 continue; 1215 if ((ifp->if_flags & IFF_BROADCAST) && 1216 ifa->ifa_broadaddr && 1217 ifa->ifa_broadaddr->sa_len != 0 && 1218 sa_equal(ifa->ifa_broadaddr, addr)) 1219 goto done; 1220 } 1221 ifa = NULL; 1222 done: 1223 IFNET_RUNLOCK(); 1224 return (ifa); 1225 } 1226 1227 /* 1228 * Locate the point to point interface with a given destination address. 1229 */ 1230 /*ARGSUSED*/ 1231 struct ifaddr * 1232 ifa_ifwithdstaddr(struct sockaddr *addr) 1233 { 1234 struct ifnet *ifp; 1235 struct ifaddr *ifa; 1236 1237 IFNET_RLOCK(); 1238 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1239 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1240 continue; 1241 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1242 if (ifa->ifa_addr->sa_family != addr->sa_family) 1243 continue; 1244 if (ifa->ifa_dstaddr != NULL && 1245 sa_equal(addr, ifa->ifa_dstaddr)) 1246 goto done; 1247 } 1248 } 1249 ifa = NULL; 1250 done: 1251 IFNET_RUNLOCK(); 1252 return (ifa); 1253 } 1254 1255 /* 1256 * Find an interface on a specific network. If many, choice 1257 * is most specific found. 1258 */ 1259 struct ifaddr * 1260 ifa_ifwithnet(struct sockaddr *addr) 1261 { 1262 struct ifnet *ifp; 1263 struct ifaddr *ifa; 1264 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 1265 u_int af = addr->sa_family; 1266 char *addr_data = addr->sa_data, *cplim; 1267 1268 /* 1269 * AF_LINK addresses can be looked up directly by their index number, 1270 * so do that if we can. 1271 */ 1272 if (af == AF_LINK) { 1273 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1274 if (sdl->sdl_index && sdl->sdl_index <= if_index) 1275 return (ifaddr_byindex(sdl->sdl_index)); 1276 } 1277 1278 /* 1279 * Scan though each interface, looking for ones that have 1280 * addresses in this address family. 1281 */ 1282 IFNET_RLOCK(); 1283 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1284 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1285 char *cp, *cp2, *cp3; 1286 1287 if (ifa->ifa_addr->sa_family != af) 1288 next: continue; 1289 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 1290 /* 1291 * This is a bit broken as it doesn't 1292 * take into account that the remote end may 1293 * be a single node in the network we are 1294 * looking for. 1295 * The trouble is that we don't know the 1296 * netmask for the remote end. 1297 */ 1298 if (ifa->ifa_dstaddr != NULL && 1299 sa_equal(addr, ifa->ifa_dstaddr)) 1300 goto done; 1301 } else { 1302 /* 1303 * if we have a special address handler, 1304 * then use it instead of the generic one. 1305 */ 1306 if (ifa->ifa_claim_addr) { 1307 if ((*ifa->ifa_claim_addr)(ifa, addr)) 1308 goto done; 1309 continue; 1310 } 1311 1312 /* 1313 * Scan all the bits in the ifa's address. 1314 * If a bit dissagrees with what we are 1315 * looking for, mask it with the netmask 1316 * to see if it really matters. 1317 * (A byte at a time) 1318 */ 1319 if (ifa->ifa_netmask == 0) 1320 continue; 1321 cp = addr_data; 1322 cp2 = ifa->ifa_addr->sa_data; 1323 cp3 = ifa->ifa_netmask->sa_data; 1324 cplim = ifa->ifa_netmask->sa_len 1325 + (char *)ifa->ifa_netmask; 1326 while (cp3 < cplim) 1327 if ((*cp++ ^ *cp2++) & *cp3++) 1328 goto next; /* next address! */ 1329 /* 1330 * If the netmask of what we just found 1331 * is more specific than what we had before 1332 * (if we had one) then remember the new one 1333 * before continuing to search 1334 * for an even better one. 1335 */ 1336 if (ifa_maybe == 0 || 1337 rn_refines((caddr_t)ifa->ifa_netmask, 1338 (caddr_t)ifa_maybe->ifa_netmask)) 1339 ifa_maybe = ifa; 1340 } 1341 } 1342 } 1343 ifa = ifa_maybe; 1344 done: 1345 IFNET_RUNLOCK(); 1346 return (ifa); 1347 } 1348 1349 /* 1350 * Find an interface address specific to an interface best matching 1351 * a given address. 1352 */ 1353 struct ifaddr * 1354 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1355 { 1356 struct ifaddr *ifa; 1357 char *cp, *cp2, *cp3; 1358 char *cplim; 1359 struct ifaddr *ifa_maybe = 0; 1360 u_int af = addr->sa_family; 1361 1362 if (af >= AF_MAX) 1363 return (NULL); 1364 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1365 if (ifa->ifa_addr->sa_family != af) 1366 continue; 1367 if (ifa_maybe == 0) 1368 ifa_maybe = ifa; 1369 if (ifa->ifa_netmask == 0) { 1370 if (sa_equal(addr, ifa->ifa_addr) || 1371 (ifa->ifa_dstaddr && 1372 sa_equal(addr, ifa->ifa_dstaddr))) 1373 goto done; 1374 continue; 1375 } 1376 if (ifp->if_flags & IFF_POINTOPOINT) { 1377 if (sa_equal(addr, ifa->ifa_dstaddr)) 1378 goto done; 1379 } else { 1380 cp = addr->sa_data; 1381 cp2 = ifa->ifa_addr->sa_data; 1382 cp3 = ifa->ifa_netmask->sa_data; 1383 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1384 for (; cp3 < cplim; cp3++) 1385 if ((*cp++ ^ *cp2++) & *cp3) 1386 break; 1387 if (cp3 == cplim) 1388 goto done; 1389 } 1390 } 1391 ifa = ifa_maybe; 1392 done: 1393 return (ifa); 1394 } 1395 1396 #include <net/route.h> 1397 1398 /* 1399 * Default action when installing a route with a Link Level gateway. 1400 * Lookup an appropriate real ifa to point to. 1401 * This should be moved to /sys/net/link.c eventually. 1402 */ 1403 static void 1404 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1405 { 1406 struct ifaddr *ifa, *oifa; 1407 struct sockaddr *dst; 1408 struct ifnet *ifp; 1409 1410 RT_LOCK_ASSERT(rt); 1411 1412 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1413 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1414 return; 1415 ifa = ifaof_ifpforaddr(dst, ifp); 1416 if (ifa) { 1417 IFAREF(ifa); /* XXX */ 1418 oifa = rt->rt_ifa; 1419 rt->rt_ifa = ifa; 1420 IFAFREE(oifa); 1421 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1422 ifa->ifa_rtrequest(cmd, rt, info); 1423 } 1424 } 1425 1426 /* 1427 * Mark an interface down and notify protocols of 1428 * the transition. 1429 * NOTE: must be called at splnet or eqivalent. 1430 */ 1431 static void 1432 if_unroute(struct ifnet *ifp, int flag, int fam) 1433 { 1434 struct ifaddr *ifa; 1435 1436 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1437 1438 ifp->if_flags &= ~flag; 1439 getmicrotime(&ifp->if_lastchange); 1440 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1441 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1442 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1443 if_qflush(&ifp->if_snd); 1444 #ifdef DEV_CARP 1445 if (ifp->if_carp) 1446 carp_carpdev_state(ifp->if_carp); 1447 #endif 1448 rt_ifmsg(ifp); 1449 } 1450 1451 /* 1452 * Mark an interface up and notify protocols of 1453 * the transition. 1454 * NOTE: must be called at splnet or eqivalent. 1455 */ 1456 static void 1457 if_route(struct ifnet *ifp, int flag, int fam) 1458 { 1459 struct ifaddr *ifa; 1460 1461 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1462 1463 ifp->if_flags |= flag; 1464 getmicrotime(&ifp->if_lastchange); 1465 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1466 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1467 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1468 #ifdef DEV_CARP 1469 if (ifp->if_carp) 1470 carp_carpdev_state(ifp->if_carp); 1471 #endif 1472 rt_ifmsg(ifp); 1473 #ifdef INET6 1474 in6_if_up(ifp); 1475 #endif 1476 } 1477 1478 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1479 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1480 1481 /* 1482 * Handle a change in the interface link state. To avoid LORs 1483 * between driver lock and upper layer locks, as well as possible 1484 * recursions, we post event to taskqueue, and all job 1485 * is done in static do_link_state_change(). 1486 */ 1487 void 1488 if_link_state_change(struct ifnet *ifp, int link_state) 1489 { 1490 /* Return if state hasn't changed. */ 1491 if (ifp->if_link_state == link_state) 1492 return; 1493 1494 ifp->if_link_state = link_state; 1495 1496 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1497 } 1498 1499 static void 1500 do_link_state_change(void *arg, int pending) 1501 { 1502 struct ifnet *ifp = (struct ifnet *)arg; 1503 int link_state = ifp->if_link_state; 1504 int link; 1505 1506 /* Notify that the link state has changed. */ 1507 rt_ifmsg(ifp); 1508 if (link_state == LINK_STATE_UP) 1509 link = NOTE_LINKUP; 1510 else if (link_state == LINK_STATE_DOWN) 1511 link = NOTE_LINKDOWN; 1512 else 1513 link = NOTE_LINKINV; 1514 KNOTE_UNLOCKED(&ifp->if_klist, link); 1515 if (ifp->if_vlantrunk != NULL) 1516 (*vlan_link_state_p)(ifp, link); 1517 1518 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1519 IFP2AC(ifp)->ac_netgraph != NULL) 1520 (*ng_ether_link_state_p)(ifp, link_state); 1521 #ifdef DEV_CARP 1522 if (ifp->if_carp) 1523 carp_carpdev_state(ifp->if_carp); 1524 #endif 1525 if (ifp->if_bridge) { 1526 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1527 (*bstp_linkstate_p)(ifp, link_state); 1528 } 1529 if (ifp->if_lagg) { 1530 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1531 (*lagg_linkstate_p)(ifp, link_state); 1532 } 1533 1534 devctl_notify("IFNET", ifp->if_xname, 1535 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1536 if (pending > 1) 1537 if_printf(ifp, "%d link states coalesced\n", pending); 1538 if (log_link_state_change) 1539 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1540 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1541 } 1542 1543 /* 1544 * Mark an interface down and notify protocols of 1545 * the transition. 1546 * NOTE: must be called at splnet or eqivalent. 1547 */ 1548 void 1549 if_down(struct ifnet *ifp) 1550 { 1551 1552 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1553 } 1554 1555 /* 1556 * Mark an interface up and notify protocols of 1557 * the transition. 1558 * NOTE: must be called at splnet or eqivalent. 1559 */ 1560 void 1561 if_up(struct ifnet *ifp) 1562 { 1563 1564 if_route(ifp, IFF_UP, AF_UNSPEC); 1565 } 1566 1567 /* 1568 * Flush an interface queue. 1569 */ 1570 static void 1571 if_qflush(struct ifaltq *ifq) 1572 { 1573 struct mbuf *m, *n; 1574 1575 IFQ_LOCK(ifq); 1576 #ifdef ALTQ 1577 if (ALTQ_IS_ENABLED(ifq)) 1578 ALTQ_PURGE(ifq); 1579 #endif 1580 n = ifq->ifq_head; 1581 while ((m = n) != 0) { 1582 n = m->m_act; 1583 m_freem(m); 1584 } 1585 ifq->ifq_head = 0; 1586 ifq->ifq_tail = 0; 1587 ifq->ifq_len = 0; 1588 IFQ_UNLOCK(ifq); 1589 } 1590 1591 /* 1592 * Handle interface watchdog timer routines. Called 1593 * from softclock, we decrement timers (if set) and 1594 * call the appropriate interface routine on expiration. 1595 * 1596 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1597 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1598 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1599 */ 1600 static void 1601 if_slowtimo(void *arg) 1602 { 1603 struct ifnet *ifp; 1604 int s = splimp(); 1605 1606 IFNET_RLOCK(); 1607 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1608 if (ifp->if_timer == 0 || --ifp->if_timer) 1609 continue; 1610 if (ifp->if_watchdog) 1611 (*ifp->if_watchdog)(ifp); 1612 } 1613 IFNET_RUNLOCK(); 1614 splx(s); 1615 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1616 } 1617 1618 /* 1619 * Map interface name to 1620 * interface structure pointer. 1621 */ 1622 struct ifnet * 1623 ifunit(const char *name) 1624 { 1625 struct ifnet *ifp; 1626 1627 IFNET_RLOCK(); 1628 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1629 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1630 break; 1631 } 1632 IFNET_RUNLOCK(); 1633 return (ifp); 1634 } 1635 1636 /* 1637 * Hardware specific interface ioctls. 1638 */ 1639 static int 1640 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1641 { 1642 struct ifreq *ifr; 1643 struct ifstat *ifs; 1644 int error = 0; 1645 int new_flags, temp_flags; 1646 size_t namelen, onamelen; 1647 char new_name[IFNAMSIZ]; 1648 struct ifaddr *ifa; 1649 struct sockaddr_dl *sdl; 1650 1651 ifr = (struct ifreq *)data; 1652 switch (cmd) { 1653 case SIOCGIFINDEX: 1654 ifr->ifr_index = ifp->if_index; 1655 break; 1656 1657 case SIOCGIFFLAGS: 1658 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1659 ifr->ifr_flags = temp_flags & 0xffff; 1660 ifr->ifr_flagshigh = temp_flags >> 16; 1661 break; 1662 1663 case SIOCGIFCAP: 1664 ifr->ifr_reqcap = ifp->if_capabilities; 1665 ifr->ifr_curcap = ifp->if_capenable; 1666 break; 1667 1668 #ifdef MAC 1669 case SIOCGIFMAC: 1670 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1671 break; 1672 #endif 1673 1674 case SIOCGIFMETRIC: 1675 ifr->ifr_metric = ifp->if_metric; 1676 break; 1677 1678 case SIOCGIFMTU: 1679 ifr->ifr_mtu = ifp->if_mtu; 1680 break; 1681 1682 case SIOCGIFPHYS: 1683 ifr->ifr_phys = ifp->if_physical; 1684 break; 1685 1686 case SIOCSIFFLAGS: 1687 error = priv_check(td, PRIV_NET_SETIFFLAGS); 1688 if (error) 1689 return (error); 1690 /* 1691 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1692 * check, so we don't need special handling here yet. 1693 */ 1694 new_flags = (ifr->ifr_flags & 0xffff) | 1695 (ifr->ifr_flagshigh << 16); 1696 if (ifp->if_flags & IFF_SMART) { 1697 /* Smart drivers twiddle their own routes */ 1698 } else if (ifp->if_flags & IFF_UP && 1699 (new_flags & IFF_UP) == 0) { 1700 int s = splimp(); 1701 if_down(ifp); 1702 splx(s); 1703 } else if (new_flags & IFF_UP && 1704 (ifp->if_flags & IFF_UP) == 0) { 1705 int s = splimp(); 1706 if_up(ifp); 1707 splx(s); 1708 } 1709 /* See if permanently promiscuous mode bit is about to flip */ 1710 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 1711 if (new_flags & IFF_PPROMISC) 1712 ifp->if_flags |= IFF_PROMISC; 1713 else if (ifp->if_pcount == 0) 1714 ifp->if_flags &= ~IFF_PROMISC; 1715 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 1716 ifp->if_xname, 1717 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 1718 } 1719 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1720 (new_flags &~ IFF_CANTCHANGE); 1721 if (ifp->if_ioctl) { 1722 IFF_LOCKGIANT(ifp); 1723 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1724 IFF_UNLOCKGIANT(ifp); 1725 } 1726 getmicrotime(&ifp->if_lastchange); 1727 break; 1728 1729 case SIOCSIFCAP: 1730 error = priv_check(td, PRIV_NET_SETIFCAP); 1731 if (error) 1732 return (error); 1733 if (ifp->if_ioctl == NULL) 1734 return (EOPNOTSUPP); 1735 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1736 return (EINVAL); 1737 IFF_LOCKGIANT(ifp); 1738 error = (*ifp->if_ioctl)(ifp, cmd, data); 1739 IFF_UNLOCKGIANT(ifp); 1740 if (error == 0) 1741 getmicrotime(&ifp->if_lastchange); 1742 break; 1743 1744 #ifdef MAC 1745 case SIOCSIFMAC: 1746 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1747 break; 1748 #endif 1749 1750 case SIOCSIFNAME: 1751 error = priv_check(td, PRIV_NET_SETIFNAME); 1752 if (error) 1753 return (error); 1754 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1755 if (error != 0) 1756 return (error); 1757 if (new_name[0] == '\0') 1758 return (EINVAL); 1759 if (ifunit(new_name) != NULL) 1760 return (EEXIST); 1761 1762 /* 1763 * XXX: Locking. Nothing else seems to lock if_flags, 1764 * and there are numerous other races with the 1765 * ifunit() checks not being atomic with namespace 1766 * changes (renames, vmoves, if_attach, etc). 1767 */ 1768 ifp->if_flags |= IFF_RENAMING; 1769 1770 /* Announce the departure of the interface. */ 1771 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1772 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1773 1774 log(LOG_INFO, "%s: changing name to '%s'\n", 1775 ifp->if_xname, new_name); 1776 1777 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1778 ifa = ifp->if_addr; 1779 IFA_LOCK(ifa); 1780 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1781 namelen = strlen(new_name); 1782 onamelen = sdl->sdl_nlen; 1783 /* 1784 * Move the address if needed. This is safe because we 1785 * allocate space for a name of length IFNAMSIZ when we 1786 * create this in if_attach(). 1787 */ 1788 if (namelen != onamelen) { 1789 bcopy(sdl->sdl_data + onamelen, 1790 sdl->sdl_data + namelen, sdl->sdl_alen); 1791 } 1792 bcopy(new_name, sdl->sdl_data, namelen); 1793 sdl->sdl_nlen = namelen; 1794 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1795 bzero(sdl->sdl_data, onamelen); 1796 while (namelen != 0) 1797 sdl->sdl_data[--namelen] = 0xff; 1798 IFA_UNLOCK(ifa); 1799 1800 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1801 /* Announce the return of the interface. */ 1802 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1803 1804 ifp->if_flags &= ~IFF_RENAMING; 1805 break; 1806 1807 case SIOCSIFMETRIC: 1808 error = priv_check(td, PRIV_NET_SETIFMETRIC); 1809 if (error) 1810 return (error); 1811 ifp->if_metric = ifr->ifr_metric; 1812 getmicrotime(&ifp->if_lastchange); 1813 break; 1814 1815 case SIOCSIFPHYS: 1816 error = priv_check(td, PRIV_NET_SETIFPHYS); 1817 if (error) 1818 return (error); 1819 if (ifp->if_ioctl == NULL) 1820 return (EOPNOTSUPP); 1821 IFF_LOCKGIANT(ifp); 1822 error = (*ifp->if_ioctl)(ifp, cmd, data); 1823 IFF_UNLOCKGIANT(ifp); 1824 if (error == 0) 1825 getmicrotime(&ifp->if_lastchange); 1826 break; 1827 1828 case SIOCSIFMTU: 1829 { 1830 u_long oldmtu = ifp->if_mtu; 1831 1832 error = priv_check(td, PRIV_NET_SETIFMTU); 1833 if (error) 1834 return (error); 1835 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1836 return (EINVAL); 1837 if (ifp->if_ioctl == NULL) 1838 return (EOPNOTSUPP); 1839 IFF_LOCKGIANT(ifp); 1840 error = (*ifp->if_ioctl)(ifp, cmd, data); 1841 IFF_UNLOCKGIANT(ifp); 1842 if (error == 0) { 1843 getmicrotime(&ifp->if_lastchange); 1844 rt_ifmsg(ifp); 1845 } 1846 /* 1847 * If the link MTU changed, do network layer specific procedure. 1848 */ 1849 if (ifp->if_mtu != oldmtu) { 1850 #ifdef INET6 1851 nd6_setmtu(ifp); 1852 #endif 1853 } 1854 break; 1855 } 1856 1857 case SIOCADDMULTI: 1858 case SIOCDELMULTI: 1859 if (cmd == SIOCADDMULTI) 1860 error = priv_check(td, PRIV_NET_ADDMULTI); 1861 else 1862 error = priv_check(td, PRIV_NET_DELMULTI); 1863 if (error) 1864 return (error); 1865 1866 /* Don't allow group membership on non-multicast interfaces. */ 1867 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1868 return (EOPNOTSUPP); 1869 1870 /* Don't let users screw up protocols' entries. */ 1871 if (ifr->ifr_addr.sa_family != AF_LINK) 1872 return (EINVAL); 1873 1874 if (cmd == SIOCADDMULTI) { 1875 struct ifmultiaddr *ifma; 1876 1877 /* 1878 * Userland is only permitted to join groups once 1879 * via the if_addmulti() KPI, because it cannot hold 1880 * struct ifmultiaddr * between calls. It may also 1881 * lose a race while we check if the membership 1882 * already exists. 1883 */ 1884 IF_ADDR_LOCK(ifp); 1885 ifma = if_findmulti(ifp, &ifr->ifr_addr); 1886 IF_ADDR_UNLOCK(ifp); 1887 if (ifma != NULL) 1888 error = EADDRINUSE; 1889 else 1890 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1891 } else { 1892 error = if_delmulti(ifp, &ifr->ifr_addr); 1893 } 1894 if (error == 0) 1895 getmicrotime(&ifp->if_lastchange); 1896 break; 1897 1898 case SIOCSIFPHYADDR: 1899 case SIOCDIFPHYADDR: 1900 #ifdef INET6 1901 case SIOCSIFPHYADDR_IN6: 1902 #endif 1903 case SIOCSLIFPHYADDR: 1904 case SIOCSIFMEDIA: 1905 case SIOCSIFGENERIC: 1906 error = priv_check(td, PRIV_NET_HWIOCTL); 1907 if (error) 1908 return (error); 1909 if (ifp->if_ioctl == NULL) 1910 return (EOPNOTSUPP); 1911 IFF_LOCKGIANT(ifp); 1912 error = (*ifp->if_ioctl)(ifp, cmd, data); 1913 IFF_UNLOCKGIANT(ifp); 1914 if (error == 0) 1915 getmicrotime(&ifp->if_lastchange); 1916 break; 1917 1918 case SIOCGIFSTATUS: 1919 ifs = (struct ifstat *)data; 1920 ifs->ascii[0] = '\0'; 1921 1922 case SIOCGIFPSRCADDR: 1923 case SIOCGIFPDSTADDR: 1924 case SIOCGLIFPHYADDR: 1925 case SIOCGIFMEDIA: 1926 case SIOCGIFGENERIC: 1927 if (ifp->if_ioctl == NULL) 1928 return (EOPNOTSUPP); 1929 IFF_LOCKGIANT(ifp); 1930 error = (*ifp->if_ioctl)(ifp, cmd, data); 1931 IFF_UNLOCKGIANT(ifp); 1932 break; 1933 1934 case SIOCSIFLLADDR: 1935 error = priv_check(td, PRIV_NET_SETLLADDR); 1936 if (error) 1937 return (error); 1938 error = if_setlladdr(ifp, 1939 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1940 break; 1941 1942 case SIOCAIFGROUP: 1943 { 1944 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1945 1946 error = priv_check(td, PRIV_NET_ADDIFGROUP); 1947 if (error) 1948 return (error); 1949 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 1950 return (error); 1951 break; 1952 } 1953 1954 case SIOCGIFGROUP: 1955 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 1956 return (error); 1957 break; 1958 1959 case SIOCDIFGROUP: 1960 { 1961 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1962 1963 error = priv_check(td, PRIV_NET_DELIFGROUP); 1964 if (error) 1965 return (error); 1966 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 1967 return (error); 1968 break; 1969 } 1970 1971 default: 1972 error = ENOIOCTL; 1973 break; 1974 } 1975 return (error); 1976 } 1977 1978 /* 1979 * Interface ioctls. 1980 */ 1981 int 1982 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1983 { 1984 struct ifnet *ifp; 1985 struct ifreq *ifr; 1986 int error; 1987 int oif_flags; 1988 1989 switch (cmd) { 1990 case SIOCGIFCONF: 1991 case OSIOCGIFCONF: 1992 #ifdef __amd64__ 1993 case SIOCGIFCONF32: 1994 #endif 1995 return (ifconf(cmd, data)); 1996 } 1997 ifr = (struct ifreq *)data; 1998 1999 switch (cmd) { 2000 case SIOCIFCREATE: 2001 case SIOCIFCREATE2: 2002 error = priv_check(td, PRIV_NET_IFCREATE); 2003 if (error) 2004 return (error); 2005 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 2006 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 2007 case SIOCIFDESTROY: 2008 error = priv_check(td, PRIV_NET_IFDESTROY); 2009 if (error) 2010 return (error); 2011 return if_clone_destroy(ifr->ifr_name); 2012 2013 case SIOCIFGCLONERS: 2014 return (if_clone_list((struct if_clonereq *)data)); 2015 case SIOCGIFGMEMB: 2016 return (if_getgroupmembers((struct ifgroupreq *)data)); 2017 } 2018 2019 ifp = ifunit(ifr->ifr_name); 2020 if (ifp == 0) 2021 return (ENXIO); 2022 2023 error = ifhwioctl(cmd, ifp, data, td); 2024 if (error != ENOIOCTL) 2025 return (error); 2026 2027 oif_flags = ifp->if_flags; 2028 if (so->so_proto == 0) 2029 return (EOPNOTSUPP); 2030 #ifndef COMPAT_43 2031 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2032 data, 2033 ifp, td)); 2034 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2035 error = (*ifp->if_ioctl)(ifp, cmd, data); 2036 #else 2037 { 2038 int ocmd = cmd; 2039 2040 switch (cmd) { 2041 2042 case SIOCSIFDSTADDR: 2043 case SIOCSIFADDR: 2044 case SIOCSIFBRDADDR: 2045 case SIOCSIFNETMASK: 2046 #if BYTE_ORDER != BIG_ENDIAN 2047 if (ifr->ifr_addr.sa_family == 0 && 2048 ifr->ifr_addr.sa_len < 16) { 2049 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2050 ifr->ifr_addr.sa_len = 16; 2051 } 2052 #else 2053 if (ifr->ifr_addr.sa_len == 0) 2054 ifr->ifr_addr.sa_len = 16; 2055 #endif 2056 break; 2057 2058 case OSIOCGIFADDR: 2059 cmd = SIOCGIFADDR; 2060 break; 2061 2062 case OSIOCGIFDSTADDR: 2063 cmd = SIOCGIFDSTADDR; 2064 break; 2065 2066 case OSIOCGIFBRDADDR: 2067 cmd = SIOCGIFBRDADDR; 2068 break; 2069 2070 case OSIOCGIFNETMASK: 2071 cmd = SIOCGIFNETMASK; 2072 } 2073 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2074 cmd, 2075 data, 2076 ifp, td)); 2077 if (error == EOPNOTSUPP && ifp != NULL && 2078 ifp->if_ioctl != NULL) 2079 error = (*ifp->if_ioctl)(ifp, cmd, data); 2080 switch (ocmd) { 2081 2082 case OSIOCGIFADDR: 2083 case OSIOCGIFDSTADDR: 2084 case OSIOCGIFBRDADDR: 2085 case OSIOCGIFNETMASK: 2086 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2087 2088 } 2089 } 2090 #endif /* COMPAT_43 */ 2091 2092 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2093 #ifdef INET6 2094 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 2095 if (ifp->if_flags & IFF_UP) { 2096 int s = splimp(); 2097 in6_if_up(ifp); 2098 splx(s); 2099 } 2100 #endif 2101 } 2102 return (error); 2103 } 2104 2105 /* 2106 * The code common to handling reference counted flags, 2107 * e.g., in ifpromisc() and if_allmulti(). 2108 * The "pflag" argument can specify a permanent mode flag to check, 2109 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2110 * 2111 * Only to be used on stack-owned flags, not driver-owned flags. 2112 */ 2113 static int 2114 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2115 { 2116 struct ifreq ifr; 2117 int error; 2118 int oldflags, oldcount; 2119 2120 /* Sanity checks to catch programming errors */ 2121 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2122 ("%s: setting driver-owned flag %d", __func__, flag)); 2123 2124 if (onswitch) 2125 KASSERT(*refcount >= 0, 2126 ("%s: increment negative refcount %d for flag %d", 2127 __func__, *refcount, flag)); 2128 else 2129 KASSERT(*refcount > 0, 2130 ("%s: decrement non-positive refcount %d for flag %d", 2131 __func__, *refcount, flag)); 2132 2133 /* In case this mode is permanent, just touch refcount */ 2134 if (ifp->if_flags & pflag) { 2135 *refcount += onswitch ? 1 : -1; 2136 return (0); 2137 } 2138 2139 /* Save ifnet parameters for if_ioctl() may fail */ 2140 oldcount = *refcount; 2141 oldflags = ifp->if_flags; 2142 2143 /* 2144 * See if we aren't the only and touching refcount is enough. 2145 * Actually toggle interface flag if we are the first or last. 2146 */ 2147 if (onswitch) { 2148 if ((*refcount)++) 2149 return (0); 2150 ifp->if_flags |= flag; 2151 } else { 2152 if (--(*refcount)) 2153 return (0); 2154 ifp->if_flags &= ~flag; 2155 } 2156 2157 /* Call down the driver since we've changed interface flags */ 2158 if (ifp->if_ioctl == NULL) { 2159 error = EOPNOTSUPP; 2160 goto recover; 2161 } 2162 ifr.ifr_flags = ifp->if_flags & 0xffff; 2163 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2164 IFF_LOCKGIANT(ifp); 2165 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2166 IFF_UNLOCKGIANT(ifp); 2167 if (error) 2168 goto recover; 2169 /* Notify userland that interface flags have changed */ 2170 rt_ifmsg(ifp); 2171 return (0); 2172 2173 recover: 2174 /* Recover after driver error */ 2175 *refcount = oldcount; 2176 ifp->if_flags = oldflags; 2177 return (error); 2178 } 2179 2180 /* 2181 * Set/clear promiscuous mode on interface ifp based on the truth value 2182 * of pswitch. The calls are reference counted so that only the first 2183 * "on" request actually has an effect, as does the final "off" request. 2184 * Results are undefined if the "off" and "on" requests are not matched. 2185 */ 2186 int 2187 ifpromisc(struct ifnet *ifp, int pswitch) 2188 { 2189 int error; 2190 int oldflags = ifp->if_flags; 2191 2192 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2193 &ifp->if_pcount, pswitch); 2194 /* If promiscuous mode status has changed, log a message */ 2195 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2196 log(LOG_INFO, "%s: promiscuous mode %s\n", 2197 ifp->if_xname, 2198 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2199 return (error); 2200 } 2201 2202 /* 2203 * Return interface configuration 2204 * of system. List may be used 2205 * in later ioctl's (above) to get 2206 * other information. 2207 */ 2208 /*ARGSUSED*/ 2209 static int 2210 ifconf(u_long cmd, caddr_t data) 2211 { 2212 struct ifconf *ifc = (struct ifconf *)data; 2213 #ifdef __amd64__ 2214 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 2215 struct ifconf ifc_swab; 2216 #endif 2217 struct ifnet *ifp; 2218 struct ifaddr *ifa; 2219 struct ifreq ifr; 2220 struct sbuf *sb; 2221 int error, full = 0, valid_len, max_len; 2222 2223 #ifdef __amd64__ 2224 if (cmd == SIOCGIFCONF32) { 2225 ifc_swab.ifc_len = ifc32->ifc_len; 2226 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 2227 ifc = &ifc_swab; 2228 } 2229 #endif 2230 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2231 max_len = MAXPHYS - 1; 2232 2233 /* Prevent hostile input from being able to crash the system */ 2234 if (ifc->ifc_len <= 0) 2235 return (EINVAL); 2236 2237 again: 2238 if (ifc->ifc_len <= max_len) { 2239 max_len = ifc->ifc_len; 2240 full = 1; 2241 } 2242 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2243 max_len = 0; 2244 valid_len = 0; 2245 2246 IFNET_RLOCK(); /* could sleep XXX */ 2247 TAILQ_FOREACH(ifp, &ifnet, if_link) { 2248 int addrs; 2249 2250 /* 2251 * Zero the ifr_name buffer to make sure we don't 2252 * disclose the contents of the stack. 2253 */ 2254 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2255 2256 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2257 >= sizeof(ifr.ifr_name)) { 2258 sbuf_delete(sb); 2259 IFNET_RUNLOCK(); 2260 return (ENAMETOOLONG); 2261 } 2262 2263 addrs = 0; 2264 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2265 struct sockaddr *sa = ifa->ifa_addr; 2266 2267 if (prison_if(curthread->td_ucred, sa) != 0) 2268 continue; 2269 addrs++; 2270 #ifdef COMPAT_43 2271 if (cmd == OSIOCGIFCONF) { 2272 struct osockaddr *osa = 2273 (struct osockaddr *)&ifr.ifr_addr; 2274 ifr.ifr_addr = *sa; 2275 osa->sa_family = sa->sa_family; 2276 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2277 max_len += sizeof(ifr); 2278 } else 2279 #endif 2280 if (sa->sa_len <= sizeof(*sa)) { 2281 ifr.ifr_addr = *sa; 2282 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2283 max_len += sizeof(ifr); 2284 } else { 2285 sbuf_bcat(sb, &ifr, 2286 offsetof(struct ifreq, ifr_addr)); 2287 max_len += offsetof(struct ifreq, ifr_addr); 2288 sbuf_bcat(sb, sa, sa->sa_len); 2289 max_len += sa->sa_len; 2290 } 2291 2292 if (!sbuf_overflowed(sb)) 2293 valid_len = sbuf_len(sb); 2294 } 2295 if (addrs == 0) { 2296 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2297 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2298 max_len += sizeof(ifr); 2299 2300 if (!sbuf_overflowed(sb)) 2301 valid_len = sbuf_len(sb); 2302 } 2303 } 2304 IFNET_RUNLOCK(); 2305 2306 /* 2307 * If we didn't allocate enough space (uncommon), try again. If 2308 * we have already allocated as much space as we are allowed, 2309 * return what we've got. 2310 */ 2311 if (valid_len != max_len && !full) { 2312 sbuf_delete(sb); 2313 goto again; 2314 } 2315 2316 ifc->ifc_len = valid_len; 2317 #ifdef __amd64__ 2318 if (cmd == SIOCGIFCONF32) 2319 ifc32->ifc_len = valid_len; 2320 #endif 2321 sbuf_finish(sb); 2322 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2323 sbuf_delete(sb); 2324 return (error); 2325 } 2326 2327 /* 2328 * Just like ifpromisc(), but for all-multicast-reception mode. 2329 */ 2330 int 2331 if_allmulti(struct ifnet *ifp, int onswitch) 2332 { 2333 2334 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2335 } 2336 2337 struct ifmultiaddr * 2338 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2339 { 2340 struct ifmultiaddr *ifma; 2341 2342 IF_ADDR_LOCK_ASSERT(ifp); 2343 2344 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2345 if (sa->sa_family == AF_LINK) { 2346 if (sa_dl_equal(ifma->ifma_addr, sa)) 2347 break; 2348 } else { 2349 if (sa_equal(ifma->ifma_addr, sa)) 2350 break; 2351 } 2352 } 2353 2354 return ifma; 2355 } 2356 2357 /* 2358 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2359 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2360 * the ifnet multicast address list here, so the caller must do that and 2361 * other setup work (such as notifying the device driver). The reference 2362 * count is initialized to 1. 2363 */ 2364 static struct ifmultiaddr * 2365 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2366 int mflags) 2367 { 2368 struct ifmultiaddr *ifma; 2369 struct sockaddr *dupsa; 2370 2371 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags | 2372 M_ZERO); 2373 if (ifma == NULL) 2374 return (NULL); 2375 2376 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags); 2377 if (dupsa == NULL) { 2378 FREE(ifma, M_IFMADDR); 2379 return (NULL); 2380 } 2381 bcopy(sa, dupsa, sa->sa_len); 2382 ifma->ifma_addr = dupsa; 2383 2384 ifma->ifma_ifp = ifp; 2385 ifma->ifma_refcount = 1; 2386 ifma->ifma_protospec = NULL; 2387 2388 if (llsa == NULL) { 2389 ifma->ifma_lladdr = NULL; 2390 return (ifma); 2391 } 2392 2393 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags); 2394 if (dupsa == NULL) { 2395 FREE(ifma->ifma_addr, M_IFMADDR); 2396 FREE(ifma, M_IFMADDR); 2397 return (NULL); 2398 } 2399 bcopy(llsa, dupsa, llsa->sa_len); 2400 ifma->ifma_lladdr = dupsa; 2401 2402 return (ifma); 2403 } 2404 2405 /* 2406 * if_freemulti: free ifmultiaddr structure and possibly attached related 2407 * addresses. The caller is responsible for implementing reference 2408 * counting, notifying the driver, handling routing messages, and releasing 2409 * any dependent link layer state. 2410 */ 2411 static void 2412 if_freemulti(struct ifmultiaddr *ifma) 2413 { 2414 2415 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2416 ifma->ifma_refcount)); 2417 KASSERT(ifma->ifma_protospec == NULL, 2418 ("if_freemulti: protospec not NULL")); 2419 2420 if (ifma->ifma_lladdr != NULL) 2421 FREE(ifma->ifma_lladdr, M_IFMADDR); 2422 FREE(ifma->ifma_addr, M_IFMADDR); 2423 FREE(ifma, M_IFMADDR); 2424 } 2425 2426 /* 2427 * Register an additional multicast address with a network interface. 2428 * 2429 * - If the address is already present, bump the reference count on the 2430 * address and return. 2431 * - If the address is not link-layer, look up a link layer address. 2432 * - Allocate address structures for one or both addresses, and attach to the 2433 * multicast address list on the interface. If automatically adding a link 2434 * layer address, the protocol address will own a reference to the link 2435 * layer address, to be freed when it is freed. 2436 * - Notify the network device driver of an addition to the multicast address 2437 * list. 2438 * 2439 * 'sa' points to caller-owned memory with the desired multicast address. 2440 * 2441 * 'retifma' will be used to return a pointer to the resulting multicast 2442 * address reference, if desired. 2443 */ 2444 int 2445 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2446 struct ifmultiaddr **retifma) 2447 { 2448 struct ifmultiaddr *ifma, *ll_ifma; 2449 struct sockaddr *llsa; 2450 int error; 2451 2452 /* 2453 * If the address is already present, return a new reference to it; 2454 * otherwise, allocate storage and set up a new address. 2455 */ 2456 IF_ADDR_LOCK(ifp); 2457 ifma = if_findmulti(ifp, sa); 2458 if (ifma != NULL) { 2459 ifma->ifma_refcount++; 2460 if (retifma != NULL) 2461 *retifma = ifma; 2462 IF_ADDR_UNLOCK(ifp); 2463 return (0); 2464 } 2465 2466 /* 2467 * The address isn't already present; resolve the protocol address 2468 * into a link layer address, and then look that up, bump its 2469 * refcount or allocate an ifma for that also. If 'llsa' was 2470 * returned, we will need to free it later. 2471 */ 2472 llsa = NULL; 2473 ll_ifma = NULL; 2474 if (ifp->if_resolvemulti != NULL) { 2475 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2476 if (error) 2477 goto unlock_out; 2478 } 2479 2480 /* 2481 * Allocate the new address. Don't hook it up yet, as we may also 2482 * need to allocate a link layer multicast address. 2483 */ 2484 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2485 if (ifma == NULL) { 2486 error = ENOMEM; 2487 goto free_llsa_out; 2488 } 2489 2490 /* 2491 * If a link layer address is found, we'll need to see if it's 2492 * already present in the address list, or allocate is as well. 2493 * When this block finishes, the link layer address will be on the 2494 * list. 2495 */ 2496 if (llsa != NULL) { 2497 ll_ifma = if_findmulti(ifp, llsa); 2498 if (ll_ifma == NULL) { 2499 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2500 if (ll_ifma == NULL) { 2501 --ifma->ifma_refcount; 2502 if_freemulti(ifma); 2503 error = ENOMEM; 2504 goto free_llsa_out; 2505 } 2506 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2507 ifma_link); 2508 } else 2509 ll_ifma->ifma_refcount++; 2510 ifma->ifma_llifma = ll_ifma; 2511 } 2512 2513 /* 2514 * We now have a new multicast address, ifma, and possibly a new or 2515 * referenced link layer address. Add the primary address to the 2516 * ifnet address list. 2517 */ 2518 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2519 2520 if (retifma != NULL) 2521 *retifma = ifma; 2522 2523 /* 2524 * Must generate the message while holding the lock so that 'ifma' 2525 * pointer is still valid. 2526 */ 2527 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2528 IF_ADDR_UNLOCK(ifp); 2529 2530 /* 2531 * We are certain we have added something, so call down to the 2532 * interface to let them know about it. 2533 */ 2534 if (ifp->if_ioctl != NULL) { 2535 IFF_LOCKGIANT(ifp); 2536 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2537 IFF_UNLOCKGIANT(ifp); 2538 } 2539 2540 if (llsa != NULL) 2541 FREE(llsa, M_IFMADDR); 2542 2543 return (0); 2544 2545 free_llsa_out: 2546 if (llsa != NULL) 2547 FREE(llsa, M_IFMADDR); 2548 2549 unlock_out: 2550 IF_ADDR_UNLOCK(ifp); 2551 return (error); 2552 } 2553 2554 /* 2555 * Delete a multicast group membership by network-layer group address. 2556 * 2557 * Returns ENOENT if the entry could not be found. If ifp no longer 2558 * exists, results are undefined. This entry point should only be used 2559 * from subsystems which do appropriate locking to hold ifp for the 2560 * duration of the call. 2561 * Network-layer protocol domains must use if_delmulti_ifma(). 2562 */ 2563 int 2564 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2565 { 2566 struct ifmultiaddr *ifma; 2567 int lastref; 2568 #ifdef INVARIANTS 2569 struct ifnet *oifp; 2570 2571 IFNET_RLOCK(); 2572 TAILQ_FOREACH(oifp, &ifnet, if_link) 2573 if (ifp == oifp) 2574 break; 2575 if (ifp != oifp) 2576 ifp = NULL; 2577 IFNET_RUNLOCK(); 2578 2579 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 2580 #endif 2581 if (ifp == NULL) 2582 return (ENOENT); 2583 2584 IF_ADDR_LOCK(ifp); 2585 lastref = 0; 2586 ifma = if_findmulti(ifp, sa); 2587 if (ifma != NULL) 2588 lastref = if_delmulti_locked(ifp, ifma, 0); 2589 IF_ADDR_UNLOCK(ifp); 2590 2591 if (ifma == NULL) 2592 return (ENOENT); 2593 2594 if (lastref && ifp->if_ioctl != NULL) { 2595 IFF_LOCKGIANT(ifp); 2596 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2597 IFF_UNLOCKGIANT(ifp); 2598 } 2599 2600 return (0); 2601 } 2602 2603 /* 2604 * Delete a multicast group membership by group membership pointer. 2605 * Network-layer protocol domains must use this routine. 2606 * 2607 * It is safe to call this routine if the ifp disappeared. Callers should 2608 * hold IFF_LOCKGIANT() to avoid a LOR in case the hardware needs to be 2609 * reconfigured. 2610 */ 2611 void 2612 if_delmulti_ifma(struct ifmultiaddr *ifma) 2613 { 2614 struct ifnet *ifp; 2615 int lastref; 2616 2617 ifp = ifma->ifma_ifp; 2618 #ifdef DIAGNOSTIC 2619 if (ifp == NULL) { 2620 printf("%s: ifma_ifp seems to be detached\n", __func__); 2621 } else { 2622 struct ifnet *oifp; 2623 2624 IFNET_RLOCK(); 2625 TAILQ_FOREACH(oifp, &ifnet, if_link) 2626 if (ifp == oifp) 2627 break; 2628 if (ifp != oifp) { 2629 printf("%s: ifnet %p disappeared\n", __func__, ifp); 2630 ifp = NULL; 2631 } 2632 IFNET_RUNLOCK(); 2633 } 2634 #endif 2635 /* 2636 * If and only if the ifnet instance exists: Acquire the address lock. 2637 */ 2638 if (ifp != NULL) 2639 IF_ADDR_LOCK(ifp); 2640 2641 lastref = if_delmulti_locked(ifp, ifma, 0); 2642 2643 if (ifp != NULL) { 2644 /* 2645 * If and only if the ifnet instance exists: 2646 * Release the address lock. 2647 * If the group was left: update the hardware hash filter. 2648 */ 2649 IF_ADDR_UNLOCK(ifp); 2650 if (lastref && ifp->if_ioctl != NULL) { 2651 IFF_LOCKGIANT(ifp); 2652 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2653 IFF_UNLOCKGIANT(ifp); 2654 } 2655 } 2656 } 2657 2658 /* 2659 * Perform deletion of network-layer and/or link-layer multicast address. 2660 * 2661 * Return 0 if the reference count was decremented. 2662 * Return 1 if the final reference was released, indicating that the 2663 * hardware hash filter should be reprogrammed. 2664 */ 2665 static int 2666 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 2667 { 2668 struct ifmultiaddr *ll_ifma; 2669 2670 if (ifp != NULL && ifma->ifma_ifp != NULL) { 2671 KASSERT(ifma->ifma_ifp == ifp, 2672 ("%s: inconsistent ifp %p", __func__, ifp)); 2673 IF_ADDR_LOCK_ASSERT(ifp); 2674 } 2675 2676 ifp = ifma->ifma_ifp; 2677 2678 /* 2679 * If the ifnet is detaching, null out references to ifnet, 2680 * so that upper protocol layers will notice, and not attempt 2681 * to obtain locks for an ifnet which no longer exists. The 2682 * routing socket announcement must happen before the ifnet 2683 * instance is detached from the system. 2684 */ 2685 if (detaching) { 2686 #ifdef DIAGNOSTIC 2687 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 2688 #endif 2689 /* 2690 * ifp may already be nulled out if we are being reentered 2691 * to delete the ll_ifma. 2692 */ 2693 if (ifp != NULL) { 2694 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2695 ifma->ifma_ifp = NULL; 2696 } 2697 } 2698 2699 if (--ifma->ifma_refcount > 0) 2700 return 0; 2701 2702 /* 2703 * If this ifma is a network-layer ifma, a link-layer ifma may 2704 * have been associated with it. Release it first if so. 2705 */ 2706 ll_ifma = ifma->ifma_llifma; 2707 if (ll_ifma != NULL) { 2708 KASSERT(ifma->ifma_lladdr != NULL, 2709 ("%s: llifma w/o lladdr", __func__)); 2710 if (detaching) 2711 ll_ifma->ifma_ifp = NULL; /* XXX */ 2712 if (--ll_ifma->ifma_refcount == 0) { 2713 if (ifp != NULL) { 2714 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 2715 ifma_link); 2716 } 2717 if_freemulti(ll_ifma); 2718 } 2719 } 2720 2721 if (ifp != NULL) 2722 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2723 2724 if_freemulti(ifma); 2725 2726 /* 2727 * The last reference to this instance of struct ifmultiaddr 2728 * was released; the hardware should be notified of this change. 2729 */ 2730 return 1; 2731 } 2732 2733 /* 2734 * Set the link layer address on an interface. 2735 * 2736 * At this time we only support certain types of interfaces, 2737 * and we don't allow the length of the address to change. 2738 */ 2739 int 2740 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2741 { 2742 struct sockaddr_dl *sdl; 2743 struct ifaddr *ifa; 2744 struct ifreq ifr; 2745 2746 ifa = ifp->if_addr; 2747 if (ifa == NULL) 2748 return (EINVAL); 2749 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2750 if (sdl == NULL) 2751 return (EINVAL); 2752 if (len != sdl->sdl_alen) /* don't allow length to change */ 2753 return (EINVAL); 2754 switch (ifp->if_type) { 2755 case IFT_ETHER: 2756 case IFT_FDDI: 2757 case IFT_XETHER: 2758 case IFT_ISO88025: 2759 case IFT_L2VLAN: 2760 case IFT_BRIDGE: 2761 case IFT_ARCNET: 2762 case IFT_IEEE8023ADLAG: 2763 bcopy(lladdr, LLADDR(sdl), len); 2764 break; 2765 default: 2766 return (ENODEV); 2767 } 2768 /* 2769 * If the interface is already up, we need 2770 * to re-init it in order to reprogram its 2771 * address filter. 2772 */ 2773 if ((ifp->if_flags & IFF_UP) != 0) { 2774 if (ifp->if_ioctl) { 2775 IFF_LOCKGIANT(ifp); 2776 ifp->if_flags &= ~IFF_UP; 2777 ifr.ifr_flags = ifp->if_flags & 0xffff; 2778 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2779 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2780 ifp->if_flags |= IFF_UP; 2781 ifr.ifr_flags = ifp->if_flags & 0xffff; 2782 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2783 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2784 IFF_UNLOCKGIANT(ifp); 2785 } 2786 #ifdef INET 2787 /* 2788 * Also send gratuitous ARPs to notify other nodes about 2789 * the address change. 2790 */ 2791 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2792 if (ifa->ifa_addr->sa_family == AF_INET) 2793 arp_ifinit(ifp, ifa); 2794 } 2795 #endif 2796 } 2797 return (0); 2798 } 2799 2800 /* 2801 * The name argument must be a pointer to storage which will last as 2802 * long as the interface does. For physical devices, the result of 2803 * device_get_name(dev) is a good choice and for pseudo-devices a 2804 * static string works well. 2805 */ 2806 void 2807 if_initname(struct ifnet *ifp, const char *name, int unit) 2808 { 2809 ifp->if_dname = name; 2810 ifp->if_dunit = unit; 2811 if (unit != IF_DUNIT_NONE) 2812 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2813 else 2814 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2815 } 2816 2817 int 2818 if_printf(struct ifnet *ifp, const char * fmt, ...) 2819 { 2820 va_list ap; 2821 int retval; 2822 2823 retval = printf("%s: ", ifp->if_xname); 2824 va_start(ap, fmt); 2825 retval += vprintf(fmt, ap); 2826 va_end(ap); 2827 return (retval); 2828 } 2829 2830 /* 2831 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 2832 * be called without Giant. However, we often can't acquire the Giant lock 2833 * at those points; instead, we run it via a task queue that holds Giant via 2834 * if_start_deferred. 2835 * 2836 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 2837 * outstanding if_start_deferred() tasks that will run after the free. This 2838 * probably means waiting in if_detach(). 2839 */ 2840 void 2841 if_start(struct ifnet *ifp) 2842 { 2843 2844 if (ifp->if_flags & IFF_NEEDSGIANT) { 2845 if (mtx_owned(&Giant)) 2846 (*(ifp)->if_start)(ifp); 2847 else 2848 taskqueue_enqueue(taskqueue_swi_giant, 2849 &ifp->if_starttask); 2850 } else 2851 (*(ifp)->if_start)(ifp); 2852 } 2853 2854 static void 2855 if_start_deferred(void *context, int pending) 2856 { 2857 struct ifnet *ifp; 2858 2859 GIANT_REQUIRED; 2860 2861 ifp = context; 2862 (ifp->if_start)(ifp); 2863 } 2864 2865 int 2866 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2867 { 2868 int active = 0; 2869 2870 IF_LOCK(ifq); 2871 if (_IF_QFULL(ifq)) { 2872 _IF_DROP(ifq); 2873 IF_UNLOCK(ifq); 2874 m_freem(m); 2875 return (0); 2876 } 2877 if (ifp != NULL) { 2878 ifp->if_obytes += m->m_pkthdr.len + adjust; 2879 if (m->m_flags & (M_BCAST|M_MCAST)) 2880 ifp->if_omcasts++; 2881 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2882 } 2883 _IF_ENQUEUE(ifq, m); 2884 IF_UNLOCK(ifq); 2885 if (ifp != NULL && !active) 2886 if_start(ifp); 2887 return (1); 2888 } 2889 2890 void 2891 if_register_com_alloc(u_char type, 2892 if_com_alloc_t *a, if_com_free_t *f) 2893 { 2894 2895 KASSERT(if_com_alloc[type] == NULL, 2896 ("if_register_com_alloc: %d already registered", type)); 2897 KASSERT(if_com_free[type] == NULL, 2898 ("if_register_com_alloc: %d free already registered", type)); 2899 2900 if_com_alloc[type] = a; 2901 if_com_free[type] = f; 2902 } 2903 2904 void 2905 if_deregister_com_alloc(u_char type) 2906 { 2907 2908 KASSERT(if_com_alloc[type] != NULL, 2909 ("if_deregister_com_alloc: %d not registered", type)); 2910 KASSERT(if_com_free[type] != NULL, 2911 ("if_deregister_com_alloc: %d free not registered", type)); 2912 if_com_alloc[type] = NULL; 2913 if_com_free[type] = NULL; 2914 }
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