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/7.3/sys/net/if.c 201599 2010-01-05 18:26:41Z jhb $ 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 /* Log link state change events */ 93 static int log_link_state_change = 1; 94 95 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 96 &log_link_state_change, 0, 97 "log interface link state change events"); 98 99 void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 100 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 101 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 102 103 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 104 105 /* 106 * XXX: Style; these should be sorted alphabetically, and unprototyped 107 * static functions should be prototyped. Currently they are sorted by 108 * declaration order. 109 */ 110 static void if_attachdomain(void *); 111 static void if_attachdomain1(struct ifnet *); 112 static void if_purgemaddrs(struct ifnet *); 113 static int ifconf(u_long, caddr_t); 114 static void if_freemulti(struct ifmultiaddr *); 115 static void if_grow(void); 116 static void if_init(void *); 117 static void if_check(void *); 118 static void if_qflush(struct ifaltq *); 119 static void if_route(struct ifnet *, int flag, int fam); 120 static int if_setflag(struct ifnet *, int, int, int *, int); 121 static void if_slowtimo(void *); 122 static void if_unroute(struct ifnet *, int flag, int fam); 123 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 124 static int if_rtdel(struct radix_node *, void *); 125 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 126 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 127 static void if_start_deferred(void *context, int pending); 128 static void do_link_state_change(void *, int); 129 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 130 static int if_getgroupmembers(struct ifgroupreq *); 131 static void if_delgroups(struct ifnet *); 132 #ifdef INET6 133 /* 134 * XXX: declare here to avoid to include many inet6 related files.. 135 * should be more generalized? 136 */ 137 extern void nd6_setmtu(struct ifnet *); 138 #endif 139 140 int if_index = 0; 141 int ifqmaxlen = IFQ_MAXLEN; 142 struct ifnethead ifnet; /* depend on static init XXX */ 143 struct ifgrouphead ifg_head; 144 struct mtx ifnet_lock; 145 static if_com_alloc_t *if_com_alloc[256]; 146 static if_com_free_t *if_com_free[256]; 147 148 static int if_indexlim = 8; 149 static struct knlist ifklist; 150 151 /* 152 * Table of ifnet/cdev by index. Locked with ifnet_lock. 153 */ 154 static struct ifindex_entry *ifindex_table = NULL; 155 156 static void filt_netdetach(struct knote *kn); 157 static int filt_netdev(struct knote *kn, long hint); 158 159 static struct filterops netdev_filtops = 160 { 1, NULL, filt_netdetach, filt_netdev }; 161 162 /* 163 * System initialization 164 */ 165 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 166 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL); 167 168 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 169 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 170 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 171 172 struct ifnet * 173 ifnet_byindex(u_short idx) 174 { 175 struct ifnet *ifp; 176 177 IFNET_RLOCK(); 178 ifp = ifindex_table[idx].ife_ifnet; 179 IFNET_RUNLOCK(); 180 return (ifp); 181 } 182 183 static void 184 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 185 { 186 187 IFNET_WLOCK_ASSERT(); 188 189 ifindex_table[idx].ife_ifnet = ifp; 190 } 191 192 struct ifaddr * 193 ifaddr_byindex(u_short idx) 194 { 195 struct ifaddr *ifa; 196 197 IFNET_RLOCK(); 198 ifa = ifnet_byindex(idx)->if_addr; 199 IFNET_RUNLOCK(); 200 return (ifa); 201 } 202 203 struct cdev * 204 ifdev_byindex(u_short idx) 205 { 206 struct cdev *cdev; 207 208 IFNET_RLOCK(); 209 cdev = ifindex_table[idx].ife_dev; 210 IFNET_RUNLOCK(); 211 return (cdev); 212 } 213 214 static void 215 ifdev_setbyindex(u_short idx, struct cdev *cdev) 216 { 217 218 IFNET_WLOCK(); 219 ifindex_table[idx].ife_dev = cdev; 220 IFNET_WUNLOCK(); 221 } 222 223 static d_open_t netopen; 224 static d_close_t netclose; 225 static d_ioctl_t netioctl; 226 static d_kqfilter_t netkqfilter; 227 228 static struct cdevsw net_cdevsw = { 229 .d_version = D_VERSION, 230 .d_flags = D_NEEDGIANT, 231 .d_open = netopen, 232 .d_close = netclose, 233 .d_ioctl = netioctl, 234 .d_name = "net", 235 .d_kqfilter = netkqfilter, 236 }; 237 238 static int 239 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 240 { 241 return (0); 242 } 243 244 static int 245 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 246 { 247 return (0); 248 } 249 250 static int 251 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 252 { 253 struct ifnet *ifp; 254 int error, idx; 255 256 /* only support interface specific ioctls */ 257 if (IOCGROUP(cmd) != 'i') 258 return (EOPNOTSUPP); 259 idx = minor(dev); 260 if (idx == 0) { 261 /* 262 * special network device, not interface. 263 */ 264 if (cmd == SIOCGIFCONF) 265 return (ifconf(cmd, data)); /* XXX remove cmd */ 266 #ifdef __amd64__ 267 if (cmd == SIOCGIFCONF32) 268 return (ifconf(cmd, data)); /* XXX remove cmd */ 269 #endif 270 return (EOPNOTSUPP); 271 } 272 273 ifp = ifnet_byindex(idx); 274 if (ifp == NULL) 275 return (ENXIO); 276 277 error = ifhwioctl(cmd, ifp, data, td); 278 if (error == ENOIOCTL) 279 error = EOPNOTSUPP; 280 return (error); 281 } 282 283 static int 284 netkqfilter(struct cdev *dev, struct knote *kn) 285 { 286 struct knlist *klist; 287 struct ifnet *ifp; 288 int idx; 289 290 switch (kn->kn_filter) { 291 case EVFILT_NETDEV: 292 kn->kn_fop = &netdev_filtops; 293 break; 294 default: 295 return (EINVAL); 296 } 297 298 idx = minor(dev); 299 if (idx == 0) { 300 klist = &ifklist; 301 } else { 302 ifp = ifnet_byindex(idx); 303 if (ifp == NULL) 304 return (1); 305 klist = &ifp->if_klist; 306 } 307 308 kn->kn_hook = (caddr_t)klist; 309 310 knlist_add(klist, kn, 0); 311 312 return (0); 313 } 314 315 static void 316 filt_netdetach(struct knote *kn) 317 { 318 struct knlist *klist = (struct knlist *)kn->kn_hook; 319 320 knlist_remove(klist, kn, 0); 321 } 322 323 static int 324 filt_netdev(struct knote *kn, long hint) 325 { 326 struct knlist *klist = (struct knlist *)kn->kn_hook; 327 328 /* 329 * Currently NOTE_EXIT is abused to indicate device detach. 330 */ 331 if (hint == NOTE_EXIT) { 332 kn->kn_data = NOTE_LINKINV; 333 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 334 knlist_remove_inevent(klist, kn); 335 return (1); 336 } 337 if (hint != 0) 338 kn->kn_data = hint; /* current status */ 339 if (kn->kn_sfflags & hint) 340 kn->kn_fflags |= hint; 341 return (kn->kn_fflags != 0); 342 } 343 344 /* 345 * Network interface utility routines. 346 * 347 * Routines with ifa_ifwith* names take sockaddr *'s as 348 * parameters. 349 */ 350 351 /* ARGSUSED*/ 352 static void 353 if_init(void *dummy __unused) 354 { 355 356 IFNET_LOCK_INIT(); 357 TAILQ_INIT(&ifnet); 358 TAILQ_INIT(&ifg_head); 359 knlist_init(&ifklist, NULL, NULL, NULL, NULL); 360 if_grow(); /* create initial table */ 361 ifdev_setbyindex(0, make_dev(&net_cdevsw, 0, UID_ROOT, GID_WHEEL, 362 0600, "network")); 363 if_clone_init(); 364 } 365 366 static void 367 if_grow(void) 368 { 369 u_int n; 370 struct ifindex_entry *e; 371 372 if_indexlim <<= 1; 373 n = if_indexlim * sizeof(*e); 374 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 375 if (ifindex_table != NULL) { 376 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 377 free((caddr_t)ifindex_table, M_IFNET); 378 } 379 ifindex_table = e; 380 } 381 382 /* ARGSUSED*/ 383 static void 384 if_check(void *dummy __unused) 385 { 386 struct ifnet *ifp; 387 int s; 388 389 s = splimp(); 390 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 391 TAILQ_FOREACH(ifp, &ifnet, if_link) { 392 if (ifp->if_snd.ifq_maxlen == 0) { 393 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 394 ifp->if_snd.ifq_maxlen = ifqmaxlen; 395 } 396 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 397 if_printf(ifp, 398 "XXX: driver didn't initialize queue mtx\n"); 399 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 400 MTX_NETWORK_LOCK, MTX_DEF); 401 } 402 } 403 IFNET_RUNLOCK(); 404 splx(s); 405 406 /* 407 * If at least one interface added during boot uses 408 * if_watchdog then start the timer. 409 */ 410 if (slowtimo_started) 411 if_slowtimo(0); 412 } 413 414 /* 415 * Allocate a struct ifnet and an index for an interface. A layer 2 416 * common structure will also be allocated if an allocation routine is 417 * registered for the passed type. 418 */ 419 struct ifnet* 420 if_alloc(u_char type) 421 { 422 struct ifnet *ifp; 423 424 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 425 426 /* 427 * Try to find an empty slot below if_index. If we fail, take 428 * the next slot. 429 * 430 * XXX: should be locked! 431 */ 432 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) { 433 if (ifnet_byindex(ifp->if_index) == NULL) 434 break; 435 } 436 /* Catch if_index overflow. */ 437 if (ifp->if_index < 1) { 438 free(ifp, M_IFNET); 439 return (NULL); 440 } 441 if (ifp->if_index > if_index) 442 if_index = ifp->if_index; 443 if (if_index >= if_indexlim) 444 if_grow(); 445 446 ifp->if_type = type; 447 448 if (if_com_alloc[type] != NULL) { 449 ifp->if_l2com = if_com_alloc[type](type, ifp); 450 if (ifp->if_l2com == NULL) { 451 free(ifp, M_IFNET); 452 return (NULL); 453 } 454 } 455 IFNET_WLOCK(); 456 ifnet_setbyindex(ifp->if_index, ifp); 457 IFNET_WUNLOCK(); 458 IF_ADDR_LOCK_INIT(ifp); 459 460 return (ifp); 461 } 462 463 /* 464 * Free the struct ifnet, the associated index, and the layer 2 common 465 * structure if needed. All the work is done in if_free_type(). 466 * 467 * Do not add code to this function! Add it to if_free_type(). 468 */ 469 void 470 if_free(struct ifnet *ifp) 471 { 472 473 if_free_type(ifp, ifp->if_type); 474 } 475 476 /* 477 * Do the actual work of freeing a struct ifnet, associated index, and 478 * layer 2 common structure. This version should only be called by 479 * intefaces that switch their type after calling if_alloc(). 480 */ 481 void 482 if_free_type(struct ifnet *ifp, u_char type) 483 { 484 485 if (ifp != ifnet_byindex(ifp->if_index)) { 486 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 487 __func__); 488 return; 489 } 490 491 IFNET_WLOCK(); 492 ifnet_setbyindex(ifp->if_index, NULL); 493 494 /* XXX: should be locked with if_findindex() */ 495 while (if_index > 0 && ifnet_byindex(if_index) == NULL) 496 if_index--; 497 IFNET_WUNLOCK(); 498 499 if (if_com_free[type] != NULL) 500 if_com_free[type](ifp->if_l2com, type); 501 502 IF_ADDR_LOCK_DESTROY(ifp); 503 free(ifp, M_IFNET); 504 }; 505 506 /* 507 * Perform generic interface initalization tasks and attach the interface 508 * to the list of "active" interfaces. 509 * 510 * XXX: 511 * - The decision to return void and thus require this function to 512 * succeed is questionable. 513 * - We do more initialization here then is probably a good idea. 514 * Some of this should probably move to if_alloc(). 515 * - We should probably do more sanity checking. For instance we don't 516 * do anything to insure if_xname is unique or non-empty. 517 */ 518 void 519 if_attach(struct ifnet *ifp) 520 { 521 unsigned socksize, ifasize; 522 int namelen, masklen; 523 struct sockaddr_dl *sdl; 524 struct ifaddr *ifa; 525 526 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 527 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 528 ifp->if_xname); 529 530 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 531 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 532 IF_AFDATA_LOCK_INIT(ifp); 533 ifp->if_afdata_initialized = 0; 534 535 TAILQ_INIT(&ifp->if_addrhead); 536 TAILQ_INIT(&ifp->if_prefixhead); 537 TAILQ_INIT(&ifp->if_multiaddrs); 538 TAILQ_INIT(&ifp->if_groups); 539 540 if_addgroup(ifp, IFG_ALL); 541 542 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 543 getmicrotime(&ifp->if_lastchange); 544 ifp->if_data.ifi_epoch = time_uptime; 545 ifp->if_data.ifi_datalen = sizeof(struct if_data); 546 547 #ifdef MAC 548 mac_init_ifnet(ifp); 549 mac_create_ifnet(ifp); 550 #endif 551 552 ifdev_setbyindex(ifp->if_index, make_dev(&net_cdevsw, 553 unit2minor(ifp->if_index), UID_ROOT, GID_WHEEL, 0600, "%s/%s", 554 net_cdevsw.d_name, ifp->if_xname)); 555 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 556 net_cdevsw.d_name, ifp->if_index); 557 558 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 559 560 /* 561 * create a Link Level name for this device 562 */ 563 namelen = strlen(ifp->if_xname); 564 /* 565 * Always save enough space for any possiable name so we can do 566 * a rename in place later. 567 */ 568 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 569 socksize = masklen + ifp->if_addrlen; 570 if (socksize < sizeof(*sdl)) 571 socksize = sizeof(*sdl); 572 socksize = roundup2(socksize, sizeof(long)); 573 ifasize = sizeof(*ifa) + 2 * socksize; 574 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 575 IFA_LOCK_INIT(ifa); 576 sdl = (struct sockaddr_dl *)(ifa + 1); 577 sdl->sdl_len = socksize; 578 sdl->sdl_family = AF_LINK; 579 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 580 sdl->sdl_nlen = namelen; 581 sdl->sdl_index = ifp->if_index; 582 sdl->sdl_type = ifp->if_type; 583 ifp->if_addr = ifa; 584 ifa->ifa_ifp = ifp; 585 ifa->ifa_rtrequest = link_rtrequest; 586 ifa->ifa_addr = (struct sockaddr *)sdl; 587 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 588 ifa->ifa_netmask = (struct sockaddr *)sdl; 589 sdl->sdl_len = masklen; 590 while (namelen != 0) 591 sdl->sdl_data[--namelen] = 0xff; 592 ifa->ifa_refcnt = 1; 593 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 594 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 595 ifp->if_snd.altq_type = 0; 596 ifp->if_snd.altq_disc = NULL; 597 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 598 ifp->if_snd.altq_tbr = NULL; 599 ifp->if_snd.altq_ifp = ifp; 600 601 IFNET_WLOCK(); 602 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 603 IFNET_WUNLOCK(); 604 605 if (domain_init_status >= 2) 606 if_attachdomain1(ifp); 607 608 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 609 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 610 611 /* Announce the interface. */ 612 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 613 614 if (ifp->if_watchdog != NULL) { 615 if_printf(ifp, 616 "WARNING: using obsoleted if_watchdog interface\n"); 617 618 /* 619 * Note that we need if_slowtimo(). If this happens after 620 * boot, then call if_slowtimo() directly. 621 */ 622 if (atomic_cmpset_int(&slowtimo_started, 0, 1) && !cold) 623 if_slowtimo(0); 624 } 625 if (ifp->if_flags & IFF_NEEDSGIANT) 626 if_printf(ifp, 627 "WARNING: using obsoleted IFF_NEEDSGIANT flag\n"); 628 } 629 630 static void 631 if_attachdomain(void *dummy) 632 { 633 struct ifnet *ifp; 634 int s; 635 636 s = splnet(); 637 TAILQ_FOREACH(ifp, &ifnet, if_link) 638 if_attachdomain1(ifp); 639 splx(s); 640 } 641 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 642 if_attachdomain, NULL); 643 644 static void 645 if_attachdomain1(struct ifnet *ifp) 646 { 647 struct domain *dp; 648 int s; 649 650 s = splnet(); 651 652 /* 653 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 654 * cannot lock ifp->if_afdata initialization, entirely. 655 */ 656 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 657 splx(s); 658 return; 659 } 660 if (ifp->if_afdata_initialized >= domain_init_status) { 661 IF_AFDATA_UNLOCK(ifp); 662 splx(s); 663 printf("if_attachdomain called more than once on %s\n", 664 ifp->if_xname); 665 return; 666 } 667 ifp->if_afdata_initialized = domain_init_status; 668 IF_AFDATA_UNLOCK(ifp); 669 670 /* address family dependent data region */ 671 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 672 for (dp = domains; dp; dp = dp->dom_next) { 673 if (dp->dom_ifattach) 674 ifp->if_afdata[dp->dom_family] = 675 (*dp->dom_ifattach)(ifp); 676 } 677 678 splx(s); 679 } 680 681 /* 682 * Remove any unicast or broadcast network addresses from an interface. 683 */ 684 void 685 if_purgeaddrs(struct ifnet *ifp) 686 { 687 struct ifaddr *ifa, *next; 688 689 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 690 if (ifa->ifa_addr->sa_family == AF_LINK) 691 continue; 692 #ifdef INET 693 /* XXX: Ugly!! ad hoc just for INET */ 694 if (ifa->ifa_addr->sa_family == AF_INET) { 695 struct ifaliasreq ifr; 696 697 bzero(&ifr, sizeof(ifr)); 698 ifr.ifra_addr = *ifa->ifa_addr; 699 if (ifa->ifa_dstaddr) 700 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 701 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 702 NULL) == 0) 703 continue; 704 } 705 #endif /* INET */ 706 #ifdef INET6 707 if (ifa->ifa_addr->sa_family == AF_INET6) { 708 in6_purgeaddr(ifa); 709 /* ifp_addrhead is already updated */ 710 continue; 711 } 712 #endif /* INET6 */ 713 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 714 IFAFREE(ifa); 715 } 716 } 717 718 /* 719 * Remove any multicast network addresses from an interface. 720 */ 721 static void 722 if_purgemaddrs(struct ifnet *ifp) 723 { 724 struct ifmultiaddr *ifma; 725 struct ifmultiaddr *next; 726 727 IF_ADDR_LOCK(ifp); 728 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 729 if_delmulti_locked(ifp, ifma, 1); 730 IF_ADDR_UNLOCK(ifp); 731 } 732 733 /* 734 * Detach an interface, removing it from the 735 * list of "active" interfaces. 736 * 737 * XXXRW: There are some significant questions about event ordering, and 738 * how to prevent things from starting to use the interface during detach. 739 */ 740 void 741 if_detach(struct ifnet *ifp) 742 { 743 struct ifaddr *ifa; 744 struct radix_node_head *rnh; 745 int s; 746 int i; 747 struct domain *dp; 748 struct ifnet *iter; 749 int found = 0; 750 751 IFNET_WLOCK(); 752 TAILQ_FOREACH(iter, &ifnet, if_link) 753 if (iter == ifp) { 754 TAILQ_REMOVE(&ifnet, ifp, if_link); 755 found = 1; 756 break; 757 } 758 IFNET_WUNLOCK(); 759 if (!found) 760 return; 761 762 /* 763 * Remove/wait for pending events. 764 */ 765 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 766 767 /* 768 * Remove routes and flush queues. 769 */ 770 s = splnet(); 771 if_down(ifp); 772 #ifdef ALTQ 773 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 774 altq_disable(&ifp->if_snd); 775 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 776 altq_detach(&ifp->if_snd); 777 #endif 778 779 if_purgeaddrs(ifp); 780 781 #ifdef INET 782 in_ifdetach(ifp); 783 #endif 784 785 #ifdef INET6 786 /* 787 * Remove all IPv6 kernel structs related to ifp. This should be done 788 * before removing routing entries below, since IPv6 interface direct 789 * routes are expected to be removed by the IPv6-specific kernel API. 790 * Otherwise, the kernel will detect some inconsistency and bark it. 791 */ 792 in6_ifdetach(ifp); 793 #endif 794 if_purgemaddrs(ifp); 795 796 /* 797 * Remove link ifaddr pointer and maybe decrement if_index. 798 * Clean up all addresses. 799 */ 800 ifp->if_addr = NULL; 801 destroy_dev(ifdev_byindex(ifp->if_index)); 802 ifdev_setbyindex(ifp->if_index, NULL); 803 804 /* We can now free link ifaddr. */ 805 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 806 ifa = TAILQ_FIRST(&ifp->if_addrhead); 807 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 808 IFAFREE(ifa); 809 } 810 811 /* 812 * Delete all remaining routes using this interface 813 * Unfortuneatly the only way to do this is to slog through 814 * the entire routing table looking for routes which point 815 * to this interface...oh well... 816 */ 817 for (i = 1; i <= AF_MAX; i++) { 818 int j; 819 for (j = 0; j < rt_numfibs; j++) { 820 if ((rnh = rt_tables[j][i]) == NULL) 821 continue; 822 RADIX_NODE_HEAD_LOCK(rnh); 823 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 824 RADIX_NODE_HEAD_UNLOCK(rnh); 825 } 826 } 827 828 /* Announce that the interface is gone. */ 829 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 830 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 831 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 832 if_delgroups(ifp); 833 834 IF_AFDATA_LOCK(ifp); 835 for (dp = domains; dp; dp = dp->dom_next) { 836 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 837 (*dp->dom_ifdetach)(ifp, 838 ifp->if_afdata[dp->dom_family]); 839 } 840 IF_AFDATA_UNLOCK(ifp); 841 842 #ifdef MAC 843 mac_destroy_ifnet(ifp); 844 #endif /* MAC */ 845 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 846 knlist_clear(&ifp->if_klist, 0); 847 knlist_destroy(&ifp->if_klist); 848 mtx_destroy(&ifp->if_snd.ifq_mtx); 849 IF_AFDATA_DESTROY(ifp); 850 splx(s); 851 } 852 853 /* 854 * Add a group to an interface 855 */ 856 int 857 if_addgroup(struct ifnet *ifp, const char *groupname) 858 { 859 struct ifg_list *ifgl; 860 struct ifg_group *ifg = NULL; 861 struct ifg_member *ifgm; 862 863 if (groupname[0] && groupname[strlen(groupname) - 1] >= '' && 864 groupname[strlen(groupname) - 1] <= '9') 865 return (EINVAL); 866 867 IFNET_WLOCK(); 868 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 869 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 870 IFNET_WUNLOCK(); 871 return (EEXIST); 872 } 873 874 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 875 M_NOWAIT)) == NULL) { 876 IFNET_WUNLOCK(); 877 return (ENOMEM); 878 } 879 880 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 881 M_TEMP, M_NOWAIT)) == NULL) { 882 free(ifgl, M_TEMP); 883 IFNET_WUNLOCK(); 884 return (ENOMEM); 885 } 886 887 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 888 if (!strcmp(ifg->ifg_group, groupname)) 889 break; 890 891 if (ifg == NULL) { 892 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 893 M_TEMP, M_NOWAIT)) == NULL) { 894 free(ifgl, M_TEMP); 895 free(ifgm, M_TEMP); 896 IFNET_WUNLOCK(); 897 return (ENOMEM); 898 } 899 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 900 ifg->ifg_refcnt = 0; 901 TAILQ_INIT(&ifg->ifg_members); 902 EVENTHANDLER_INVOKE(group_attach_event, ifg); 903 TAILQ_INSERT_TAIL(&ifg_head, ifg, ifg_next); 904 } 905 906 ifg->ifg_refcnt++; 907 ifgl->ifgl_group = ifg; 908 ifgm->ifgm_ifp = ifp; 909 910 IF_ADDR_LOCK(ifp); 911 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 912 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 913 IF_ADDR_UNLOCK(ifp); 914 915 IFNET_WUNLOCK(); 916 917 EVENTHANDLER_INVOKE(group_change_event, groupname); 918 919 return (0); 920 } 921 922 /* 923 * Remove a group from an interface 924 */ 925 int 926 if_delgroup(struct ifnet *ifp, const char *groupname) 927 { 928 struct ifg_list *ifgl; 929 struct ifg_member *ifgm; 930 931 IFNET_WLOCK(); 932 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 933 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 934 break; 935 if (ifgl == NULL) { 936 IFNET_WUNLOCK(); 937 return (ENOENT); 938 } 939 940 IF_ADDR_LOCK(ifp); 941 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 942 IF_ADDR_UNLOCK(ifp); 943 944 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 945 if (ifgm->ifgm_ifp == ifp) 946 break; 947 948 if (ifgm != NULL) { 949 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 950 free(ifgm, M_TEMP); 951 } 952 953 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 954 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next); 955 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 956 free(ifgl->ifgl_group, M_TEMP); 957 } 958 IFNET_WUNLOCK(); 959 960 free(ifgl, M_TEMP); 961 962 EVENTHANDLER_INVOKE(group_change_event, groupname); 963 964 return (0); 965 } 966 967 /* 968 * Remove an interface from all groups 969 */ 970 static void 971 if_delgroups(struct ifnet *ifp) 972 { 973 struct ifg_list *ifgl; 974 struct ifg_member *ifgm; 975 char groupname[IFNAMSIZ]; 976 977 IFNET_WLOCK(); 978 while (!TAILQ_EMPTY(&ifp->if_groups)) { 979 ifgl = TAILQ_FIRST(&ifp->if_groups); 980 981 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 982 983 IF_ADDR_LOCK(ifp); 984 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 985 IF_ADDR_UNLOCK(ifp); 986 987 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 988 if (ifgm->ifgm_ifp == ifp) 989 break; 990 991 if (ifgm != NULL) { 992 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 993 ifgm_next); 994 free(ifgm, M_TEMP); 995 } 996 997 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 998 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next); 999 EVENTHANDLER_INVOKE(group_detach_event, 1000 ifgl->ifgl_group); 1001 free(ifgl->ifgl_group, M_TEMP); 1002 } 1003 IFNET_WUNLOCK(); 1004 1005 free(ifgl, M_TEMP); 1006 1007 EVENTHANDLER_INVOKE(group_change_event, groupname); 1008 1009 IFNET_WLOCK(); 1010 } 1011 IFNET_WUNLOCK(); 1012 } 1013 1014 /* 1015 * Stores all groups from an interface in memory pointed 1016 * to by data 1017 */ 1018 static int 1019 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1020 { 1021 int len, error; 1022 struct ifg_list *ifgl; 1023 struct ifg_req ifgrq, *ifgp; 1024 struct ifgroupreq *ifgr = data; 1025 1026 if (ifgr->ifgr_len == 0) { 1027 IF_ADDR_LOCK(ifp); 1028 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1029 ifgr->ifgr_len += sizeof(struct ifg_req); 1030 IF_ADDR_UNLOCK(ifp); 1031 return (0); 1032 } 1033 1034 len = ifgr->ifgr_len; 1035 ifgp = ifgr->ifgr_groups; 1036 /* XXX: wire */ 1037 IF_ADDR_LOCK(ifp); 1038 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1039 if (len < sizeof(ifgrq)) { 1040 IF_ADDR_UNLOCK(ifp); 1041 return (EINVAL); 1042 } 1043 bzero(&ifgrq, sizeof ifgrq); 1044 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1045 sizeof(ifgrq.ifgrq_group)); 1046 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1047 IF_ADDR_UNLOCK(ifp); 1048 return (error); 1049 } 1050 len -= sizeof(ifgrq); 1051 ifgp++; 1052 } 1053 IF_ADDR_UNLOCK(ifp); 1054 1055 return (0); 1056 } 1057 1058 /* 1059 * Stores all members of a group in memory pointed to by data 1060 */ 1061 static int 1062 if_getgroupmembers(struct ifgroupreq *data) 1063 { 1064 struct ifgroupreq *ifgr = data; 1065 struct ifg_group *ifg; 1066 struct ifg_member *ifgm; 1067 struct ifg_req ifgrq, *ifgp; 1068 int len, error; 1069 1070 IFNET_RLOCK(); 1071 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 1072 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1073 break; 1074 if (ifg == NULL) { 1075 IFNET_RUNLOCK(); 1076 return (ENOENT); 1077 } 1078 1079 if (ifgr->ifgr_len == 0) { 1080 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1081 ifgr->ifgr_len += sizeof(ifgrq); 1082 IFNET_RUNLOCK(); 1083 return (0); 1084 } 1085 1086 len = ifgr->ifgr_len; 1087 ifgp = ifgr->ifgr_groups; 1088 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1089 if (len < sizeof(ifgrq)) { 1090 IFNET_RUNLOCK(); 1091 return (EINVAL); 1092 } 1093 bzero(&ifgrq, sizeof ifgrq); 1094 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1095 sizeof(ifgrq.ifgrq_member)); 1096 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1097 IFNET_RUNLOCK(); 1098 return (error); 1099 } 1100 len -= sizeof(ifgrq); 1101 ifgp++; 1102 } 1103 IFNET_RUNLOCK(); 1104 1105 return (0); 1106 } 1107 1108 /* 1109 * Delete Routes for a Network Interface 1110 * 1111 * Called for each routing entry via the rnh->rnh_walktree() call above 1112 * to delete all route entries referencing a detaching network interface. 1113 * 1114 * Arguments: 1115 * rn pointer to node in the routing table 1116 * arg argument passed to rnh->rnh_walktree() - detaching interface 1117 * 1118 * Returns: 1119 * 0 successful 1120 * errno failed - reason indicated 1121 * 1122 */ 1123 static int 1124 if_rtdel(struct radix_node *rn, void *arg) 1125 { 1126 struct rtentry *rt = (struct rtentry *)rn; 1127 struct ifnet *ifp = arg; 1128 int err; 1129 1130 if (rt->rt_ifp == ifp) { 1131 1132 /* 1133 * Protect (sorta) against walktree recursion problems 1134 * with cloned routes 1135 */ 1136 if ((rt->rt_flags & RTF_UP) == 0) 1137 return (0); 1138 1139 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1140 rt_mask(rt), rt->rt_flags, 1141 (struct rtentry **) NULL, rt->rt_fibnum); 1142 if (err) { 1143 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1144 } 1145 } 1146 1147 return (0); 1148 } 1149 1150 /* 1151 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1152 * structs used to represent other address families, it is necessary 1153 * to perform a different comparison. 1154 */ 1155 1156 #define sa_equal(a1, a2) \ 1157 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1158 1159 #define sa_dl_equal(a1, a2) \ 1160 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1161 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1162 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1163 LLADDR((struct sockaddr_dl *)(a2)), \ 1164 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1165 1166 /* 1167 * Locate an interface based on a complete address. 1168 */ 1169 /*ARGSUSED*/ 1170 struct ifaddr * 1171 ifa_ifwithaddr(struct sockaddr *addr) 1172 { 1173 struct ifnet *ifp; 1174 struct ifaddr *ifa; 1175 1176 IFNET_RLOCK(); 1177 TAILQ_FOREACH(ifp, &ifnet, if_link) 1178 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1179 if (ifa->ifa_addr->sa_family != addr->sa_family) 1180 continue; 1181 if (sa_equal(addr, ifa->ifa_addr)) 1182 goto done; 1183 /* IP6 doesn't have broadcast */ 1184 if ((ifp->if_flags & IFF_BROADCAST) && 1185 ifa->ifa_broadaddr && 1186 ifa->ifa_broadaddr->sa_len != 0 && 1187 sa_equal(ifa->ifa_broadaddr, addr)) 1188 goto done; 1189 } 1190 ifa = NULL; 1191 done: 1192 IFNET_RUNLOCK(); 1193 return (ifa); 1194 } 1195 1196 /* 1197 * Locate an interface based on the broadcast address. 1198 */ 1199 /* ARGSUSED */ 1200 struct ifaddr * 1201 ifa_ifwithbroadaddr(struct sockaddr *addr) 1202 { 1203 struct ifnet *ifp; 1204 struct ifaddr *ifa; 1205 1206 IFNET_RLOCK(); 1207 TAILQ_FOREACH(ifp, &ifnet, if_link) 1208 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1209 if (ifa->ifa_addr->sa_family != addr->sa_family) 1210 continue; 1211 if ((ifp->if_flags & IFF_BROADCAST) && 1212 ifa->ifa_broadaddr && 1213 ifa->ifa_broadaddr->sa_len != 0 && 1214 sa_equal(ifa->ifa_broadaddr, addr)) 1215 goto done; 1216 } 1217 ifa = NULL; 1218 done: 1219 IFNET_RUNLOCK(); 1220 return (ifa); 1221 } 1222 1223 /* 1224 * Locate the point to point interface with a given destination address. 1225 */ 1226 /*ARGSUSED*/ 1227 struct ifaddr * 1228 ifa_ifwithdstaddr(struct sockaddr *addr) 1229 { 1230 struct ifnet *ifp; 1231 struct ifaddr *ifa; 1232 1233 IFNET_RLOCK(); 1234 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1235 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1236 continue; 1237 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1238 if (ifa->ifa_addr->sa_family != addr->sa_family) 1239 continue; 1240 if (ifa->ifa_dstaddr != NULL && 1241 sa_equal(addr, ifa->ifa_dstaddr)) 1242 goto done; 1243 } 1244 } 1245 ifa = NULL; 1246 done: 1247 IFNET_RUNLOCK(); 1248 return (ifa); 1249 } 1250 1251 /* 1252 * Find an interface on a specific network. If many, choice 1253 * is most specific found. 1254 */ 1255 struct ifaddr * 1256 ifa_ifwithnet(struct sockaddr *addr) 1257 { 1258 struct ifnet *ifp; 1259 struct ifaddr *ifa; 1260 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 1261 u_int af = addr->sa_family; 1262 char *addr_data = addr->sa_data, *cplim; 1263 1264 /* 1265 * AF_LINK addresses can be looked up directly by their index number, 1266 * so do that if we can. 1267 */ 1268 if (af == AF_LINK) { 1269 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1270 if (sdl->sdl_index && sdl->sdl_index <= if_index) 1271 return (ifaddr_byindex(sdl->sdl_index)); 1272 } 1273 1274 /* 1275 * Scan though each interface, looking for ones that have 1276 * addresses in this address family. 1277 */ 1278 IFNET_RLOCK(); 1279 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1280 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1281 char *cp, *cp2, *cp3; 1282 1283 if (ifa->ifa_addr->sa_family != af) 1284 next: continue; 1285 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 1286 /* 1287 * This is a bit broken as it doesn't 1288 * take into account that the remote end may 1289 * be a single node in the network we are 1290 * looking for. 1291 * The trouble is that we don't know the 1292 * netmask for the remote end. 1293 */ 1294 if (ifa->ifa_dstaddr != NULL && 1295 sa_equal(addr, ifa->ifa_dstaddr)) 1296 goto done; 1297 } else { 1298 /* 1299 * if we have a special address handler, 1300 * then use it instead of the generic one. 1301 */ 1302 if (ifa->ifa_claim_addr) { 1303 if ((*ifa->ifa_claim_addr)(ifa, addr)) 1304 goto done; 1305 continue; 1306 } 1307 1308 /* 1309 * Scan all the bits in the ifa's address. 1310 * If a bit dissagrees with what we are 1311 * looking for, mask it with the netmask 1312 * to see if it really matters. 1313 * (A byte at a time) 1314 */ 1315 if (ifa->ifa_netmask == 0) 1316 continue; 1317 cp = addr_data; 1318 cp2 = ifa->ifa_addr->sa_data; 1319 cp3 = ifa->ifa_netmask->sa_data; 1320 cplim = ifa->ifa_netmask->sa_len 1321 + (char *)ifa->ifa_netmask; 1322 while (cp3 < cplim) 1323 if ((*cp++ ^ *cp2++) & *cp3++) 1324 goto next; /* next address! */ 1325 /* 1326 * If the netmask of what we just found 1327 * is more specific than what we had before 1328 * (if we had one) then remember the new one 1329 * before continuing to search 1330 * for an even better one. 1331 */ 1332 if (ifa_maybe == 0 || 1333 rn_refines((caddr_t)ifa->ifa_netmask, 1334 (caddr_t)ifa_maybe->ifa_netmask)) 1335 ifa_maybe = ifa; 1336 } 1337 } 1338 } 1339 ifa = ifa_maybe; 1340 done: 1341 IFNET_RUNLOCK(); 1342 return (ifa); 1343 } 1344 1345 /* 1346 * Find an interface address specific to an interface best matching 1347 * a given address. 1348 */ 1349 struct ifaddr * 1350 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1351 { 1352 struct ifaddr *ifa; 1353 char *cp, *cp2, *cp3; 1354 char *cplim; 1355 struct ifaddr *ifa_maybe = 0; 1356 u_int af = addr->sa_family; 1357 1358 if (af >= AF_MAX) 1359 return (0); 1360 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1361 if (ifa->ifa_addr->sa_family != af) 1362 continue; 1363 if (ifa_maybe == 0) 1364 ifa_maybe = ifa; 1365 if (ifa->ifa_netmask == 0) { 1366 if (sa_equal(addr, ifa->ifa_addr) || 1367 (ifa->ifa_dstaddr && 1368 sa_equal(addr, ifa->ifa_dstaddr))) 1369 goto done; 1370 continue; 1371 } 1372 if (ifp->if_flags & IFF_POINTOPOINT) { 1373 if (sa_equal(addr, ifa->ifa_dstaddr)) 1374 goto done; 1375 } else { 1376 cp = addr->sa_data; 1377 cp2 = ifa->ifa_addr->sa_data; 1378 cp3 = ifa->ifa_netmask->sa_data; 1379 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1380 for (; cp3 < cplim; cp3++) 1381 if ((*cp++ ^ *cp2++) & *cp3) 1382 break; 1383 if (cp3 == cplim) 1384 goto done; 1385 } 1386 } 1387 ifa = ifa_maybe; 1388 done: 1389 return (ifa); 1390 } 1391 1392 #include <net/route.h> 1393 1394 /* 1395 * Default action when installing a route with a Link Level gateway. 1396 * Lookup an appropriate real ifa to point to. 1397 * This should be moved to /sys/net/link.c eventually. 1398 */ 1399 static void 1400 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1401 { 1402 struct ifaddr *ifa, *oifa; 1403 struct sockaddr *dst; 1404 struct ifnet *ifp; 1405 1406 RT_LOCK_ASSERT(rt); 1407 1408 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1409 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1410 return; 1411 ifa = ifaof_ifpforaddr(dst, ifp); 1412 if (ifa) { 1413 IFAREF(ifa); /* XXX */ 1414 oifa = rt->rt_ifa; 1415 rt->rt_ifa = ifa; 1416 IFAFREE(oifa); 1417 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1418 ifa->ifa_rtrequest(cmd, rt, info); 1419 } 1420 } 1421 1422 /* 1423 * Mark an interface down and notify protocols of 1424 * the transition. 1425 * NOTE: must be called at splnet or eqivalent. 1426 */ 1427 static void 1428 if_unroute(struct ifnet *ifp, int flag, int fam) 1429 { 1430 struct ifaddr *ifa; 1431 1432 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1433 1434 ifp->if_flags &= ~flag; 1435 getmicrotime(&ifp->if_lastchange); 1436 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1437 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1438 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1439 if_qflush(&ifp->if_snd); 1440 #ifdef DEV_CARP 1441 if (ifp->if_carp) 1442 carp_carpdev_state(ifp->if_carp); 1443 #endif 1444 rt_ifmsg(ifp); 1445 } 1446 1447 /* 1448 * Mark an interface up and notify protocols of 1449 * the transition. 1450 * NOTE: must be called at splnet or eqivalent. 1451 */ 1452 static void 1453 if_route(struct ifnet *ifp, int flag, int fam) 1454 { 1455 struct ifaddr *ifa; 1456 1457 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1458 1459 ifp->if_flags |= flag; 1460 getmicrotime(&ifp->if_lastchange); 1461 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1462 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1463 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1464 #ifdef DEV_CARP 1465 if (ifp->if_carp) 1466 carp_carpdev_state(ifp->if_carp); 1467 #endif 1468 rt_ifmsg(ifp); 1469 #ifdef INET6 1470 in6_if_up(ifp); 1471 #endif 1472 } 1473 1474 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1475 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1476 1477 /* 1478 * Handle a change in the interface link state. To avoid LORs 1479 * between driver lock and upper layer locks, as well as possible 1480 * recursions, we post event to taskqueue, and all job 1481 * is done in static do_link_state_change(). 1482 */ 1483 void 1484 if_link_state_change(struct ifnet *ifp, int link_state) 1485 { 1486 /* Return if state hasn't changed. */ 1487 if (ifp->if_link_state == link_state) 1488 return; 1489 1490 ifp->if_link_state = link_state; 1491 1492 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1493 } 1494 1495 static void 1496 do_link_state_change(void *arg, int pending) 1497 { 1498 struct ifnet *ifp = (struct ifnet *)arg; 1499 int link_state = ifp->if_link_state; 1500 int link; 1501 1502 /* Notify that the link state has changed. */ 1503 rt_ifmsg(ifp); 1504 if (link_state == LINK_STATE_UP) 1505 link = NOTE_LINKUP; 1506 else if (link_state == LINK_STATE_DOWN) 1507 link = NOTE_LINKDOWN; 1508 else 1509 link = NOTE_LINKINV; 1510 KNOTE_UNLOCKED(&ifp->if_klist, link); 1511 if (ifp->if_vlantrunk != NULL) 1512 (*vlan_link_state_p)(ifp, link); 1513 1514 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1515 IFP2AC(ifp)->ac_netgraph != NULL) 1516 (*ng_ether_link_state_p)(ifp, link_state); 1517 #ifdef DEV_CARP 1518 if (ifp->if_carp) 1519 carp_carpdev_state(ifp->if_carp); 1520 #endif 1521 if (ifp->if_bridge) { 1522 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1523 (*bstp_linkstate_p)(ifp, link_state); 1524 } 1525 if (ifp->if_lagg) { 1526 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1527 (*lagg_linkstate_p)(ifp, link_state); 1528 } 1529 1530 devctl_notify("IFNET", ifp->if_xname, 1531 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1532 if (pending > 1) 1533 if_printf(ifp, "%d link states coalesced\n", pending); 1534 if (log_link_state_change) 1535 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1536 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1537 } 1538 1539 /* 1540 * Mark an interface down and notify protocols of 1541 * the transition. 1542 * NOTE: must be called at splnet or eqivalent. 1543 */ 1544 void 1545 if_down(struct ifnet *ifp) 1546 { 1547 1548 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1549 } 1550 1551 /* 1552 * Mark an interface up and notify protocols of 1553 * the transition. 1554 * NOTE: must be called at splnet or eqivalent. 1555 */ 1556 void 1557 if_up(struct ifnet *ifp) 1558 { 1559 1560 if_route(ifp, IFF_UP, AF_UNSPEC); 1561 } 1562 1563 /* 1564 * Flush an interface queue. 1565 */ 1566 static void 1567 if_qflush(struct ifaltq *ifq) 1568 { 1569 struct mbuf *m, *n; 1570 1571 IFQ_LOCK(ifq); 1572 #ifdef ALTQ 1573 if (ALTQ_IS_ENABLED(ifq)) 1574 ALTQ_PURGE(ifq); 1575 #endif 1576 n = ifq->ifq_head; 1577 while ((m = n) != 0) { 1578 n = m->m_act; 1579 m_freem(m); 1580 } 1581 ifq->ifq_head = 0; 1582 ifq->ifq_tail = 0; 1583 ifq->ifq_len = 0; 1584 IFQ_UNLOCK(ifq); 1585 } 1586 1587 /* 1588 * Handle interface watchdog timer routines. Called 1589 * from softclock, we decrement timers (if set) and 1590 * call the appropriate interface routine on expiration. 1591 * 1592 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1593 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1594 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1595 */ 1596 static void 1597 if_slowtimo(void *arg) 1598 { 1599 struct ifnet *ifp; 1600 int s = splimp(); 1601 1602 IFNET_RLOCK(); 1603 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1604 if (ifp->if_timer == 0 || --ifp->if_timer) 1605 continue; 1606 if (ifp->if_watchdog) 1607 (*ifp->if_watchdog)(ifp); 1608 } 1609 IFNET_RUNLOCK(); 1610 splx(s); 1611 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1612 } 1613 1614 /* 1615 * Map interface name to 1616 * interface structure pointer. 1617 */ 1618 struct ifnet * 1619 ifunit(const char *name) 1620 { 1621 struct ifnet *ifp; 1622 1623 IFNET_RLOCK(); 1624 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1625 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1626 break; 1627 } 1628 IFNET_RUNLOCK(); 1629 return (ifp); 1630 } 1631 1632 /* 1633 * Hardware specific interface ioctls. 1634 */ 1635 static int 1636 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1637 { 1638 struct ifreq *ifr; 1639 struct ifstat *ifs; 1640 int error = 0; 1641 int new_flags, temp_flags; 1642 size_t namelen, onamelen; 1643 char new_name[IFNAMSIZ]; 1644 struct ifaddr *ifa; 1645 struct sockaddr_dl *sdl; 1646 1647 ifr = (struct ifreq *)data; 1648 switch (cmd) { 1649 case SIOCGIFINDEX: 1650 ifr->ifr_index = ifp->if_index; 1651 break; 1652 1653 case SIOCGIFFLAGS: 1654 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1655 ifr->ifr_flags = temp_flags & 0xffff; 1656 ifr->ifr_flagshigh = temp_flags >> 16; 1657 break; 1658 1659 case SIOCGIFCAP: 1660 ifr->ifr_reqcap = ifp->if_capabilities; 1661 ifr->ifr_curcap = ifp->if_capenable; 1662 break; 1663 1664 #ifdef MAC 1665 case SIOCGIFMAC: 1666 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1667 break; 1668 #endif 1669 1670 case SIOCGIFMETRIC: 1671 ifr->ifr_metric = ifp->if_metric; 1672 break; 1673 1674 case SIOCGIFMTU: 1675 ifr->ifr_mtu = ifp->if_mtu; 1676 break; 1677 1678 case SIOCGIFPHYS: 1679 ifr->ifr_phys = ifp->if_physical; 1680 break; 1681 1682 case SIOCSIFFLAGS: 1683 error = priv_check(td, PRIV_NET_SETIFFLAGS); 1684 if (error) 1685 return (error); 1686 /* 1687 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1688 * check, so we don't need special handling here yet. 1689 */ 1690 new_flags = (ifr->ifr_flags & 0xffff) | 1691 (ifr->ifr_flagshigh << 16); 1692 if (ifp->if_flags & IFF_SMART) { 1693 /* Smart drivers twiddle their own routes */ 1694 } else if (ifp->if_flags & IFF_UP && 1695 (new_flags & IFF_UP) == 0) { 1696 int s = splimp(); 1697 if_down(ifp); 1698 splx(s); 1699 } else if (new_flags & IFF_UP && 1700 (ifp->if_flags & IFF_UP) == 0) { 1701 int s = splimp(); 1702 if_up(ifp); 1703 splx(s); 1704 } 1705 /* See if permanently promiscuous mode bit is about to flip */ 1706 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 1707 if (new_flags & IFF_PPROMISC) 1708 ifp->if_flags |= IFF_PROMISC; 1709 else if (ifp->if_pcount == 0) 1710 ifp->if_flags &= ~IFF_PROMISC; 1711 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 1712 ifp->if_xname, 1713 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 1714 } 1715 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1716 (new_flags &~ IFF_CANTCHANGE); 1717 if (ifp->if_ioctl) { 1718 IFF_LOCKGIANT(ifp); 1719 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1720 IFF_UNLOCKGIANT(ifp); 1721 } 1722 getmicrotime(&ifp->if_lastchange); 1723 break; 1724 1725 case SIOCSIFCAP: 1726 error = priv_check(td, PRIV_NET_SETIFCAP); 1727 if (error) 1728 return (error); 1729 if (ifp->if_ioctl == NULL) 1730 return (EOPNOTSUPP); 1731 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1732 return (EINVAL); 1733 IFF_LOCKGIANT(ifp); 1734 error = (*ifp->if_ioctl)(ifp, cmd, data); 1735 IFF_UNLOCKGIANT(ifp); 1736 if (error == 0) 1737 getmicrotime(&ifp->if_lastchange); 1738 break; 1739 1740 #ifdef MAC 1741 case SIOCSIFMAC: 1742 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1743 break; 1744 #endif 1745 1746 case SIOCSIFNAME: 1747 error = priv_check(td, PRIV_NET_SETIFNAME); 1748 if (error) 1749 return (error); 1750 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1751 if (error != 0) 1752 return (error); 1753 if (new_name[0] == '\0') 1754 return (EINVAL); 1755 if (ifunit(new_name) != NULL) 1756 return (EEXIST); 1757 1758 /* 1759 * XXX: Locking. Nothing else seems to lock if_flags, 1760 * and there are numerous other races with the 1761 * ifunit() checks not being atomic with namespace 1762 * changes (renames, vmoves, if_attach, etc). 1763 */ 1764 ifp->if_flags |= IFF_RENAMING; 1765 1766 /* Announce the departure of the interface. */ 1767 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1768 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1769 1770 log(LOG_INFO, "%s: changing name to '%s'\n", 1771 ifp->if_xname, new_name); 1772 1773 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1774 ifa = ifp->if_addr; 1775 IFA_LOCK(ifa); 1776 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1777 namelen = strlen(new_name); 1778 onamelen = sdl->sdl_nlen; 1779 /* 1780 * Move the address if needed. This is safe because we 1781 * allocate space for a name of length IFNAMSIZ when we 1782 * create this in if_attach(). 1783 */ 1784 if (namelen != onamelen) { 1785 bcopy(sdl->sdl_data + onamelen, 1786 sdl->sdl_data + namelen, sdl->sdl_alen); 1787 } 1788 bcopy(new_name, sdl->sdl_data, namelen); 1789 sdl->sdl_nlen = namelen; 1790 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1791 bzero(sdl->sdl_data, onamelen); 1792 while (namelen != 0) 1793 sdl->sdl_data[--namelen] = 0xff; 1794 IFA_UNLOCK(ifa); 1795 1796 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1797 /* Announce the return of the interface. */ 1798 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1799 1800 ifp->if_flags &= ~IFF_RENAMING; 1801 break; 1802 1803 case SIOCSIFMETRIC: 1804 error = priv_check(td, PRIV_NET_SETIFMETRIC); 1805 if (error) 1806 return (error); 1807 ifp->if_metric = ifr->ifr_metric; 1808 getmicrotime(&ifp->if_lastchange); 1809 break; 1810 1811 case SIOCSIFPHYS: 1812 error = priv_check(td, PRIV_NET_SETIFPHYS); 1813 if (error) 1814 return (error); 1815 if (ifp->if_ioctl == NULL) 1816 return (EOPNOTSUPP); 1817 IFF_LOCKGIANT(ifp); 1818 error = (*ifp->if_ioctl)(ifp, cmd, data); 1819 IFF_UNLOCKGIANT(ifp); 1820 if (error == 0) 1821 getmicrotime(&ifp->if_lastchange); 1822 break; 1823 1824 case SIOCSIFMTU: 1825 { 1826 u_long oldmtu = ifp->if_mtu; 1827 1828 error = priv_check(td, PRIV_NET_SETIFMTU); 1829 if (error) 1830 return (error); 1831 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1832 return (EINVAL); 1833 if (ifp->if_ioctl == NULL) 1834 return (EOPNOTSUPP); 1835 IFF_LOCKGIANT(ifp); 1836 error = (*ifp->if_ioctl)(ifp, cmd, data); 1837 IFF_UNLOCKGIANT(ifp); 1838 if (error == 0) { 1839 getmicrotime(&ifp->if_lastchange); 1840 rt_ifmsg(ifp); 1841 } 1842 /* 1843 * If the link MTU changed, do network layer specific procedure. 1844 */ 1845 if (ifp->if_mtu != oldmtu) { 1846 #ifdef INET6 1847 nd6_setmtu(ifp); 1848 #endif 1849 } 1850 break; 1851 } 1852 1853 case SIOCADDMULTI: 1854 case SIOCDELMULTI: 1855 if (cmd == SIOCADDMULTI) 1856 error = priv_check(td, PRIV_NET_ADDMULTI); 1857 else 1858 error = priv_check(td, PRIV_NET_DELMULTI); 1859 if (error) 1860 return (error); 1861 1862 /* Don't allow group membership on non-multicast interfaces. */ 1863 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1864 return (EOPNOTSUPP); 1865 1866 /* Don't let users screw up protocols' entries. */ 1867 if (ifr->ifr_addr.sa_family != AF_LINK) 1868 return (EINVAL); 1869 1870 if (cmd == SIOCADDMULTI) { 1871 struct ifmultiaddr *ifma; 1872 1873 /* 1874 * Userland is only permitted to join groups once 1875 * via the if_addmulti() KPI, because it cannot hold 1876 * struct ifmultiaddr * between calls. It may also 1877 * lose a race while we check if the membership 1878 * already exists. 1879 */ 1880 IF_ADDR_LOCK(ifp); 1881 ifma = if_findmulti(ifp, &ifr->ifr_addr); 1882 IF_ADDR_UNLOCK(ifp); 1883 if (ifma != NULL) 1884 error = EADDRINUSE; 1885 else 1886 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1887 } else { 1888 error = if_delmulti(ifp, &ifr->ifr_addr); 1889 } 1890 if (error == 0) 1891 getmicrotime(&ifp->if_lastchange); 1892 break; 1893 1894 case SIOCSIFPHYADDR: 1895 case SIOCDIFPHYADDR: 1896 #ifdef INET6 1897 case SIOCSIFPHYADDR_IN6: 1898 #endif 1899 case SIOCSLIFPHYADDR: 1900 case SIOCSIFMEDIA: 1901 case SIOCSIFGENERIC: 1902 error = priv_check(td, PRIV_NET_HWIOCTL); 1903 if (error) 1904 return (error); 1905 if (ifp->if_ioctl == NULL) 1906 return (EOPNOTSUPP); 1907 IFF_LOCKGIANT(ifp); 1908 error = (*ifp->if_ioctl)(ifp, cmd, data); 1909 IFF_UNLOCKGIANT(ifp); 1910 if (error == 0) 1911 getmicrotime(&ifp->if_lastchange); 1912 break; 1913 1914 case SIOCGIFSTATUS: 1915 ifs = (struct ifstat *)data; 1916 ifs->ascii[0] = '\0'; 1917 1918 case SIOCGIFPSRCADDR: 1919 case SIOCGIFPDSTADDR: 1920 case SIOCGLIFPHYADDR: 1921 case SIOCGIFMEDIA: 1922 case SIOCGIFGENERIC: 1923 if (ifp->if_ioctl == NULL) 1924 return (EOPNOTSUPP); 1925 IFF_LOCKGIANT(ifp); 1926 error = (*ifp->if_ioctl)(ifp, cmd, data); 1927 IFF_UNLOCKGIANT(ifp); 1928 break; 1929 1930 case SIOCSIFLLADDR: 1931 error = priv_check(td, PRIV_NET_SETLLADDR); 1932 if (error) 1933 return (error); 1934 error = if_setlladdr(ifp, 1935 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1936 break; 1937 1938 case SIOCAIFGROUP: 1939 { 1940 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1941 1942 error = priv_check(td, PRIV_NET_ADDIFGROUP); 1943 if (error) 1944 return (error); 1945 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 1946 return (error); 1947 break; 1948 } 1949 1950 case SIOCGIFGROUP: 1951 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 1952 return (error); 1953 break; 1954 1955 case SIOCDIFGROUP: 1956 { 1957 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1958 1959 error = priv_check(td, PRIV_NET_DELIFGROUP); 1960 if (error) 1961 return (error); 1962 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 1963 return (error); 1964 break; 1965 } 1966 1967 default: 1968 error = ENOIOCTL; 1969 break; 1970 } 1971 return (error); 1972 } 1973 1974 /* 1975 * Interface ioctls. 1976 */ 1977 int 1978 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1979 { 1980 struct ifnet *ifp; 1981 struct ifreq *ifr; 1982 int error; 1983 int oif_flags; 1984 1985 switch (cmd) { 1986 case SIOCGIFCONF: 1987 case OSIOCGIFCONF: 1988 #ifdef __amd64__ 1989 case SIOCGIFCONF32: 1990 #endif 1991 return (ifconf(cmd, data)); 1992 } 1993 ifr = (struct ifreq *)data; 1994 1995 switch (cmd) { 1996 case SIOCIFCREATE: 1997 case SIOCIFCREATE2: 1998 error = priv_check(td, PRIV_NET_IFCREATE); 1999 if (error) 2000 return (error); 2001 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 2002 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 2003 case SIOCIFDESTROY: 2004 error = priv_check(td, PRIV_NET_IFDESTROY); 2005 if (error) 2006 return (error); 2007 return if_clone_destroy(ifr->ifr_name); 2008 2009 case SIOCIFGCLONERS: 2010 return (if_clone_list((struct if_clonereq *)data)); 2011 case SIOCGIFGMEMB: 2012 return (if_getgroupmembers((struct ifgroupreq *)data)); 2013 } 2014 2015 ifp = ifunit(ifr->ifr_name); 2016 if (ifp == 0) 2017 return (ENXIO); 2018 2019 error = ifhwioctl(cmd, ifp, data, td); 2020 if (error != ENOIOCTL) 2021 return (error); 2022 2023 oif_flags = ifp->if_flags; 2024 if (so->so_proto == 0) 2025 return (EOPNOTSUPP); 2026 #ifndef COMPAT_43 2027 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2028 data, 2029 ifp, td)); 2030 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2031 error = (*ifp->if_ioctl)(ifp, cmd, data); 2032 #else 2033 { 2034 int ocmd = cmd; 2035 2036 switch (cmd) { 2037 2038 case SIOCSIFDSTADDR: 2039 case SIOCSIFADDR: 2040 case SIOCSIFBRDADDR: 2041 case SIOCSIFNETMASK: 2042 #if BYTE_ORDER != BIG_ENDIAN 2043 if (ifr->ifr_addr.sa_family == 0 && 2044 ifr->ifr_addr.sa_len < 16) { 2045 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2046 ifr->ifr_addr.sa_len = 16; 2047 } 2048 #else 2049 if (ifr->ifr_addr.sa_len == 0) 2050 ifr->ifr_addr.sa_len = 16; 2051 #endif 2052 break; 2053 2054 case OSIOCGIFADDR: 2055 cmd = SIOCGIFADDR; 2056 break; 2057 2058 case OSIOCGIFDSTADDR: 2059 cmd = SIOCGIFDSTADDR; 2060 break; 2061 2062 case OSIOCGIFBRDADDR: 2063 cmd = SIOCGIFBRDADDR; 2064 break; 2065 2066 case OSIOCGIFNETMASK: 2067 cmd = SIOCGIFNETMASK; 2068 } 2069 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2070 cmd, 2071 data, 2072 ifp, td)); 2073 if (error == EOPNOTSUPP && ifp != NULL && 2074 ifp->if_ioctl != NULL) 2075 error = (*ifp->if_ioctl)(ifp, cmd, data); 2076 switch (ocmd) { 2077 2078 case OSIOCGIFADDR: 2079 case OSIOCGIFDSTADDR: 2080 case OSIOCGIFBRDADDR: 2081 case OSIOCGIFNETMASK: 2082 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2083 2084 } 2085 } 2086 #endif /* COMPAT_43 */ 2087 2088 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2089 #ifdef INET6 2090 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 2091 if (ifp->if_flags & IFF_UP) { 2092 int s = splimp(); 2093 in6_if_up(ifp); 2094 splx(s); 2095 } 2096 #endif 2097 } 2098 return (error); 2099 } 2100 2101 /* 2102 * The code common to handling reference counted flags, 2103 * e.g., in ifpromisc() and if_allmulti(). 2104 * The "pflag" argument can specify a permanent mode flag to check, 2105 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2106 * 2107 * Only to be used on stack-owned flags, not driver-owned flags. 2108 */ 2109 static int 2110 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2111 { 2112 struct ifreq ifr; 2113 int error; 2114 int oldflags, oldcount; 2115 2116 /* Sanity checks to catch programming errors */ 2117 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2118 ("%s: setting driver-owned flag %d", __func__, flag)); 2119 2120 if (onswitch) 2121 KASSERT(*refcount >= 0, 2122 ("%s: increment negative refcount %d for flag %d", 2123 __func__, *refcount, flag)); 2124 else 2125 KASSERT(*refcount > 0, 2126 ("%s: decrement non-positive refcount %d for flag %d", 2127 __func__, *refcount, flag)); 2128 2129 /* In case this mode is permanent, just touch refcount */ 2130 if (ifp->if_flags & pflag) { 2131 *refcount += onswitch ? 1 : -1; 2132 return (0); 2133 } 2134 2135 /* Save ifnet parameters for if_ioctl() may fail */ 2136 oldcount = *refcount; 2137 oldflags = ifp->if_flags; 2138 2139 /* 2140 * See if we aren't the only and touching refcount is enough. 2141 * Actually toggle interface flag if we are the first or last. 2142 */ 2143 if (onswitch) { 2144 if ((*refcount)++) 2145 return (0); 2146 ifp->if_flags |= flag; 2147 } else { 2148 if (--(*refcount)) 2149 return (0); 2150 ifp->if_flags &= ~flag; 2151 } 2152 2153 /* Call down the driver since we've changed interface flags */ 2154 if (ifp->if_ioctl == NULL) { 2155 error = EOPNOTSUPP; 2156 goto recover; 2157 } 2158 ifr.ifr_flags = ifp->if_flags & 0xffff; 2159 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2160 IFF_LOCKGIANT(ifp); 2161 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2162 IFF_UNLOCKGIANT(ifp); 2163 if (error) 2164 goto recover; 2165 /* Notify userland that interface flags have changed */ 2166 rt_ifmsg(ifp); 2167 return (0); 2168 2169 recover: 2170 /* Recover after driver error */ 2171 *refcount = oldcount; 2172 ifp->if_flags = oldflags; 2173 return (error); 2174 } 2175 2176 /* 2177 * Set/clear promiscuous mode on interface ifp based on the truth value 2178 * of pswitch. The calls are reference counted so that only the first 2179 * "on" request actually has an effect, as does the final "off" request. 2180 * Results are undefined if the "off" and "on" requests are not matched. 2181 */ 2182 int 2183 ifpromisc(struct ifnet *ifp, int pswitch) 2184 { 2185 int error; 2186 int oldflags = ifp->if_flags; 2187 2188 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2189 &ifp->if_pcount, pswitch); 2190 /* If promiscuous mode status has changed, log a message */ 2191 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2192 log(LOG_INFO, "%s: promiscuous mode %s\n", 2193 ifp->if_xname, 2194 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2195 return (error); 2196 } 2197 2198 /* 2199 * Return interface configuration 2200 * of system. List may be used 2201 * in later ioctl's (above) to get 2202 * other information. 2203 */ 2204 /*ARGSUSED*/ 2205 static int 2206 ifconf(u_long cmd, caddr_t data) 2207 { 2208 struct ifconf *ifc = (struct ifconf *)data; 2209 #ifdef __amd64__ 2210 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 2211 struct ifconf ifc_swab; 2212 #endif 2213 struct ifnet *ifp; 2214 struct ifaddr *ifa; 2215 struct ifreq ifr; 2216 struct sbuf *sb; 2217 int error, full = 0, valid_len, max_len; 2218 2219 #ifdef __amd64__ 2220 if (cmd == SIOCGIFCONF32) { 2221 ifc_swab.ifc_len = ifc32->ifc_len; 2222 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 2223 ifc = &ifc_swab; 2224 } 2225 #endif 2226 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2227 max_len = MAXPHYS - 1; 2228 2229 /* Prevent hostile input from being able to crash the system */ 2230 if (ifc->ifc_len <= 0) 2231 return (EINVAL); 2232 2233 again: 2234 if (ifc->ifc_len <= max_len) { 2235 max_len = ifc->ifc_len; 2236 full = 1; 2237 } 2238 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2239 max_len = 0; 2240 valid_len = 0; 2241 2242 IFNET_RLOCK(); /* could sleep XXX */ 2243 TAILQ_FOREACH(ifp, &ifnet, if_link) { 2244 int addrs; 2245 2246 /* 2247 * Zero the ifr_name buffer to make sure we don't 2248 * disclose the contents of the stack. 2249 */ 2250 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2251 2252 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2253 >= sizeof(ifr.ifr_name)) { 2254 sbuf_delete(sb); 2255 IFNET_RUNLOCK(); 2256 return (ENAMETOOLONG); 2257 } 2258 2259 addrs = 0; 2260 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2261 struct sockaddr *sa = ifa->ifa_addr; 2262 2263 if (prison_if(curthread->td_ucred, sa) != 0) 2264 continue; 2265 addrs++; 2266 #ifdef COMPAT_43 2267 if (cmd == OSIOCGIFCONF) { 2268 struct osockaddr *osa = 2269 (struct osockaddr *)&ifr.ifr_addr; 2270 ifr.ifr_addr = *sa; 2271 osa->sa_family = sa->sa_family; 2272 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2273 max_len += sizeof(ifr); 2274 } else 2275 #endif 2276 if (sa->sa_len <= sizeof(*sa)) { 2277 ifr.ifr_addr = *sa; 2278 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2279 max_len += sizeof(ifr); 2280 } else { 2281 sbuf_bcat(sb, &ifr, 2282 offsetof(struct ifreq, ifr_addr)); 2283 max_len += offsetof(struct ifreq, ifr_addr); 2284 sbuf_bcat(sb, sa, sa->sa_len); 2285 max_len += sa->sa_len; 2286 } 2287 2288 if (!sbuf_overflowed(sb)) 2289 valid_len = sbuf_len(sb); 2290 } 2291 if (addrs == 0) { 2292 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2293 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2294 max_len += sizeof(ifr); 2295 2296 if (!sbuf_overflowed(sb)) 2297 valid_len = sbuf_len(sb); 2298 } 2299 } 2300 IFNET_RUNLOCK(); 2301 2302 /* 2303 * If we didn't allocate enough space (uncommon), try again. If 2304 * we have already allocated as much space as we are allowed, 2305 * return what we've got. 2306 */ 2307 if (valid_len != max_len && !full) { 2308 sbuf_delete(sb); 2309 goto again; 2310 } 2311 2312 ifc->ifc_len = valid_len; 2313 #ifdef __amd64__ 2314 if (cmd == SIOCGIFCONF32) 2315 ifc32->ifc_len = valid_len; 2316 #endif 2317 sbuf_finish(sb); 2318 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2319 sbuf_delete(sb); 2320 return (error); 2321 } 2322 2323 /* 2324 * Just like ifpromisc(), but for all-multicast-reception mode. 2325 */ 2326 int 2327 if_allmulti(struct ifnet *ifp, int onswitch) 2328 { 2329 2330 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2331 } 2332 2333 struct ifmultiaddr * 2334 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2335 { 2336 struct ifmultiaddr *ifma; 2337 2338 IF_ADDR_LOCK_ASSERT(ifp); 2339 2340 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2341 if (sa->sa_family == AF_LINK) { 2342 if (sa_dl_equal(ifma->ifma_addr, sa)) 2343 break; 2344 } else { 2345 if (sa_equal(ifma->ifma_addr, sa)) 2346 break; 2347 } 2348 } 2349 2350 return ifma; 2351 } 2352 2353 /* 2354 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2355 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2356 * the ifnet multicast address list here, so the caller must do that and 2357 * other setup work (such as notifying the device driver). The reference 2358 * count is initialized to 1. 2359 */ 2360 static struct ifmultiaddr * 2361 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2362 int mflags) 2363 { 2364 struct ifmultiaddr *ifma; 2365 struct sockaddr *dupsa; 2366 2367 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags | 2368 M_ZERO); 2369 if (ifma == NULL) 2370 return (NULL); 2371 2372 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags); 2373 if (dupsa == NULL) { 2374 FREE(ifma, M_IFMADDR); 2375 return (NULL); 2376 } 2377 bcopy(sa, dupsa, sa->sa_len); 2378 ifma->ifma_addr = dupsa; 2379 2380 ifma->ifma_ifp = ifp; 2381 ifma->ifma_refcount = 1; 2382 ifma->ifma_protospec = NULL; 2383 2384 if (llsa == NULL) { 2385 ifma->ifma_lladdr = NULL; 2386 return (ifma); 2387 } 2388 2389 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags); 2390 if (dupsa == NULL) { 2391 FREE(ifma->ifma_addr, M_IFMADDR); 2392 FREE(ifma, M_IFMADDR); 2393 return (NULL); 2394 } 2395 bcopy(llsa, dupsa, llsa->sa_len); 2396 ifma->ifma_lladdr = dupsa; 2397 2398 return (ifma); 2399 } 2400 2401 /* 2402 * if_freemulti: free ifmultiaddr structure and possibly attached related 2403 * addresses. The caller is responsible for implementing reference 2404 * counting, notifying the driver, handling routing messages, and releasing 2405 * any dependent link layer state. 2406 */ 2407 static void 2408 if_freemulti(struct ifmultiaddr *ifma) 2409 { 2410 2411 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2412 ifma->ifma_refcount)); 2413 KASSERT(ifma->ifma_protospec == NULL, 2414 ("if_freemulti: protospec not NULL")); 2415 2416 if (ifma->ifma_lladdr != NULL) 2417 FREE(ifma->ifma_lladdr, M_IFMADDR); 2418 FREE(ifma->ifma_addr, M_IFMADDR); 2419 FREE(ifma, M_IFMADDR); 2420 } 2421 2422 /* 2423 * Register an additional multicast address with a network interface. 2424 * 2425 * - If the address is already present, bump the reference count on the 2426 * address and return. 2427 * - If the address is not link-layer, look up a link layer address. 2428 * - Allocate address structures for one or both addresses, and attach to the 2429 * multicast address list on the interface. If automatically adding a link 2430 * layer address, the protocol address will own a reference to the link 2431 * layer address, to be freed when it is freed. 2432 * - Notify the network device driver of an addition to the multicast address 2433 * list. 2434 * 2435 * 'sa' points to caller-owned memory with the desired multicast address. 2436 * 2437 * 'retifma' will be used to return a pointer to the resulting multicast 2438 * address reference, if desired. 2439 */ 2440 int 2441 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2442 struct ifmultiaddr **retifma) 2443 { 2444 struct ifmultiaddr *ifma, *ll_ifma; 2445 struct sockaddr *llsa; 2446 int error; 2447 2448 /* 2449 * If the address is already present, return a new reference to it; 2450 * otherwise, allocate storage and set up a new address. 2451 */ 2452 IF_ADDR_LOCK(ifp); 2453 ifma = if_findmulti(ifp, sa); 2454 if (ifma != NULL) { 2455 ifma->ifma_refcount++; 2456 if (retifma != NULL) 2457 *retifma = ifma; 2458 IF_ADDR_UNLOCK(ifp); 2459 return (0); 2460 } 2461 2462 /* 2463 * The address isn't already present; resolve the protocol address 2464 * into a link layer address, and then look that up, bump its 2465 * refcount or allocate an ifma for that also. If 'llsa' was 2466 * returned, we will need to free it later. 2467 */ 2468 llsa = NULL; 2469 ll_ifma = NULL; 2470 if (ifp->if_resolvemulti != NULL) { 2471 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2472 if (error) 2473 goto unlock_out; 2474 } 2475 2476 /* 2477 * Allocate the new address. Don't hook it up yet, as we may also 2478 * need to allocate a link layer multicast address. 2479 */ 2480 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2481 if (ifma == NULL) { 2482 error = ENOMEM; 2483 goto free_llsa_out; 2484 } 2485 2486 /* 2487 * If a link layer address is found, we'll need to see if it's 2488 * already present in the address list, or allocate is as well. 2489 * When this block finishes, the link layer address will be on the 2490 * list. 2491 */ 2492 if (llsa != NULL) { 2493 ll_ifma = if_findmulti(ifp, llsa); 2494 if (ll_ifma == NULL) { 2495 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2496 if (ll_ifma == NULL) { 2497 --ifma->ifma_refcount; 2498 if_freemulti(ifma); 2499 error = ENOMEM; 2500 goto free_llsa_out; 2501 } 2502 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2503 ifma_link); 2504 } else 2505 ll_ifma->ifma_refcount++; 2506 ifma->ifma_llifma = ll_ifma; 2507 } 2508 2509 /* 2510 * We now have a new multicast address, ifma, and possibly a new or 2511 * referenced link layer address. Add the primary address to the 2512 * ifnet address list. 2513 */ 2514 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2515 2516 if (retifma != NULL) 2517 *retifma = ifma; 2518 2519 /* 2520 * Must generate the message while holding the lock so that 'ifma' 2521 * pointer is still valid. 2522 */ 2523 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2524 IF_ADDR_UNLOCK(ifp); 2525 2526 /* 2527 * We are certain we have added something, so call down to the 2528 * interface to let them know about it. 2529 */ 2530 if (ifp->if_ioctl != NULL) { 2531 IFF_LOCKGIANT(ifp); 2532 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2533 IFF_UNLOCKGIANT(ifp); 2534 } 2535 2536 if (llsa != NULL) 2537 FREE(llsa, M_IFMADDR); 2538 2539 return (0); 2540 2541 free_llsa_out: 2542 if (llsa != NULL) 2543 FREE(llsa, M_IFMADDR); 2544 2545 unlock_out: 2546 IF_ADDR_UNLOCK(ifp); 2547 return (error); 2548 } 2549 2550 /* 2551 * Delete a multicast group membership by network-layer group address. 2552 * 2553 * Returns ENOENT if the entry could not be found. If ifp no longer 2554 * exists, results are undefined. This entry point should only be used 2555 * from subsystems which do appropriate locking to hold ifp for the 2556 * duration of the call. 2557 * Network-layer protocol domains must use if_delmulti_ifma(). 2558 */ 2559 int 2560 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2561 { 2562 struct ifmultiaddr *ifma; 2563 int lastref; 2564 #ifdef INVARIANTS 2565 struct ifnet *oifp; 2566 2567 IFNET_RLOCK(); 2568 TAILQ_FOREACH(oifp, &ifnet, if_link) 2569 if (ifp == oifp) 2570 break; 2571 if (ifp != oifp) 2572 ifp = NULL; 2573 IFNET_RUNLOCK(); 2574 2575 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 2576 #endif 2577 if (ifp == NULL) 2578 return (ENOENT); 2579 2580 IF_ADDR_LOCK(ifp); 2581 lastref = 0; 2582 ifma = if_findmulti(ifp, sa); 2583 if (ifma != NULL) 2584 lastref = if_delmulti_locked(ifp, ifma, 0); 2585 IF_ADDR_UNLOCK(ifp); 2586 2587 if (ifma == NULL) 2588 return (ENOENT); 2589 2590 if (lastref && ifp->if_ioctl != NULL) { 2591 IFF_LOCKGIANT(ifp); 2592 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2593 IFF_UNLOCKGIANT(ifp); 2594 } 2595 2596 return (0); 2597 } 2598 2599 /* 2600 * Delete a multicast group membership by group membership pointer. 2601 * Network-layer protocol domains must use this routine. 2602 * 2603 * It is safe to call this routine if the ifp disappeared. Callers should 2604 * hold IFF_LOCKGIANT() to avoid a LOR in case the hardware needs to be 2605 * reconfigured. 2606 */ 2607 void 2608 if_delmulti_ifma(struct ifmultiaddr *ifma) 2609 { 2610 struct ifnet *ifp; 2611 int lastref; 2612 2613 ifp = ifma->ifma_ifp; 2614 #ifdef DIAGNOSTIC 2615 if (ifp == NULL) { 2616 printf("%s: ifma_ifp seems to be detached\n", __func__); 2617 } else { 2618 struct ifnet *oifp; 2619 2620 IFNET_RLOCK(); 2621 TAILQ_FOREACH(oifp, &ifnet, if_link) 2622 if (ifp == oifp) 2623 break; 2624 if (ifp != oifp) { 2625 printf("%s: ifnet %p disappeared\n", __func__, ifp); 2626 ifp = NULL; 2627 } 2628 IFNET_RUNLOCK(); 2629 } 2630 #endif 2631 /* 2632 * If and only if the ifnet instance exists: Acquire the address lock. 2633 */ 2634 if (ifp != NULL) 2635 IF_ADDR_LOCK(ifp); 2636 2637 lastref = if_delmulti_locked(ifp, ifma, 0); 2638 2639 if (ifp != NULL) { 2640 /* 2641 * If and only if the ifnet instance exists: 2642 * Release the address lock. 2643 * If the group was left: update the hardware hash filter. 2644 */ 2645 IF_ADDR_UNLOCK(ifp); 2646 if (lastref && ifp->if_ioctl != NULL) { 2647 IFF_LOCKGIANT(ifp); 2648 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2649 IFF_UNLOCKGIANT(ifp); 2650 } 2651 } 2652 } 2653 2654 /* 2655 * Perform deletion of network-layer and/or link-layer multicast address. 2656 * 2657 * Return 0 if the reference count was decremented. 2658 * Return 1 if the final reference was released, indicating that the 2659 * hardware hash filter should be reprogrammed. 2660 */ 2661 static int 2662 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 2663 { 2664 struct ifmultiaddr *ll_ifma; 2665 2666 if (ifp != NULL && ifma->ifma_ifp != NULL) { 2667 KASSERT(ifma->ifma_ifp == ifp, 2668 ("%s: inconsistent ifp %p", __func__, ifp)); 2669 IF_ADDR_LOCK_ASSERT(ifp); 2670 } 2671 2672 ifp = ifma->ifma_ifp; 2673 2674 /* 2675 * If the ifnet is detaching, null out references to ifnet, 2676 * so that upper protocol layers will notice, and not attempt 2677 * to obtain locks for an ifnet which no longer exists. The 2678 * routing socket announcement must happen before the ifnet 2679 * instance is detached from the system. 2680 */ 2681 if (detaching) { 2682 #ifdef DIAGNOSTIC 2683 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 2684 #endif 2685 /* 2686 * ifp may already be nulled out if we are being reentered 2687 * to delete the ll_ifma. 2688 */ 2689 if (ifp != NULL) { 2690 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2691 ifma->ifma_ifp = NULL; 2692 } 2693 } 2694 2695 if (--ifma->ifma_refcount > 0) 2696 return 0; 2697 2698 /* 2699 * If this ifma is a network-layer ifma, a link-layer ifma may 2700 * have been associated with it. Release it first if so. 2701 */ 2702 ll_ifma = ifma->ifma_llifma; 2703 if (ll_ifma != NULL) { 2704 KASSERT(ifma->ifma_lladdr != NULL, 2705 ("%s: llifma w/o lladdr", __func__)); 2706 if (detaching) 2707 ll_ifma->ifma_ifp = NULL; /* XXX */ 2708 if (--ll_ifma->ifma_refcount == 0) { 2709 if (ifp != NULL) { 2710 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 2711 ifma_link); 2712 } 2713 if_freemulti(ll_ifma); 2714 } 2715 } 2716 2717 if (ifp != NULL) 2718 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2719 2720 if_freemulti(ifma); 2721 2722 /* 2723 * The last reference to this instance of struct ifmultiaddr 2724 * was released; the hardware should be notified of this change. 2725 */ 2726 return 1; 2727 } 2728 2729 /* 2730 * Set the link layer address on an interface. 2731 * 2732 * At this time we only support certain types of interfaces, 2733 * and we don't allow the length of the address to change. 2734 */ 2735 int 2736 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2737 { 2738 struct sockaddr_dl *sdl; 2739 struct ifaddr *ifa; 2740 struct ifreq ifr; 2741 2742 ifa = ifp->if_addr; 2743 if (ifa == NULL) 2744 return (EINVAL); 2745 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2746 if (sdl == NULL) 2747 return (EINVAL); 2748 if (len != sdl->sdl_alen) /* don't allow length to change */ 2749 return (EINVAL); 2750 switch (ifp->if_type) { 2751 case IFT_ETHER: 2752 case IFT_FDDI: 2753 case IFT_XETHER: 2754 case IFT_ISO88025: 2755 case IFT_L2VLAN: 2756 case IFT_BRIDGE: 2757 case IFT_ARCNET: 2758 case IFT_IEEE8023ADLAG: 2759 bcopy(lladdr, LLADDR(sdl), len); 2760 break; 2761 default: 2762 return (ENODEV); 2763 } 2764 /* 2765 * If the interface is already up, we need 2766 * to re-init it in order to reprogram its 2767 * address filter. 2768 */ 2769 if ((ifp->if_flags & IFF_UP) != 0) { 2770 if (ifp->if_ioctl) { 2771 IFF_LOCKGIANT(ifp); 2772 ifp->if_flags &= ~IFF_UP; 2773 ifr.ifr_flags = ifp->if_flags & 0xffff; 2774 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2775 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 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 IFF_UNLOCKGIANT(ifp); 2781 } 2782 #ifdef INET 2783 /* 2784 * Also send gratuitous ARPs to notify other nodes about 2785 * the address change. 2786 */ 2787 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2788 if (ifa->ifa_addr->sa_family == AF_INET) 2789 arp_ifinit(ifp, ifa); 2790 } 2791 #endif 2792 } 2793 return (0); 2794 } 2795 2796 /* 2797 * The name argument must be a pointer to storage which will last as 2798 * long as the interface does. For physical devices, the result of 2799 * device_get_name(dev) is a good choice and for pseudo-devices a 2800 * static string works well. 2801 */ 2802 void 2803 if_initname(struct ifnet *ifp, const char *name, int unit) 2804 { 2805 ifp->if_dname = name; 2806 ifp->if_dunit = unit; 2807 if (unit != IF_DUNIT_NONE) 2808 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2809 else 2810 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2811 } 2812 2813 int 2814 if_printf(struct ifnet *ifp, const char * fmt, ...) 2815 { 2816 va_list ap; 2817 int retval; 2818 2819 retval = printf("%s: ", ifp->if_xname); 2820 va_start(ap, fmt); 2821 retval += vprintf(fmt, ap); 2822 va_end(ap); 2823 return (retval); 2824 } 2825 2826 /* 2827 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 2828 * be called without Giant. However, we often can't acquire the Giant lock 2829 * at those points; instead, we run it via a task queue that holds Giant via 2830 * if_start_deferred. 2831 * 2832 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 2833 * outstanding if_start_deferred() tasks that will run after the free. This 2834 * probably means waiting in if_detach(). 2835 */ 2836 void 2837 if_start(struct ifnet *ifp) 2838 { 2839 2840 if (ifp->if_flags & IFF_NEEDSGIANT) { 2841 if (mtx_owned(&Giant)) 2842 (*(ifp)->if_start)(ifp); 2843 else 2844 taskqueue_enqueue(taskqueue_swi_giant, 2845 &ifp->if_starttask); 2846 } else 2847 (*(ifp)->if_start)(ifp); 2848 } 2849 2850 static void 2851 if_start_deferred(void *context, int pending) 2852 { 2853 struct ifnet *ifp; 2854 2855 GIANT_REQUIRED; 2856 2857 ifp = context; 2858 (ifp->if_start)(ifp); 2859 } 2860 2861 int 2862 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2863 { 2864 int active = 0; 2865 2866 IF_LOCK(ifq); 2867 if (_IF_QFULL(ifq)) { 2868 _IF_DROP(ifq); 2869 IF_UNLOCK(ifq); 2870 m_freem(m); 2871 return (0); 2872 } 2873 if (ifp != NULL) { 2874 ifp->if_obytes += m->m_pkthdr.len + adjust; 2875 if (m->m_flags & (M_BCAST|M_MCAST)) 2876 ifp->if_omcasts++; 2877 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2878 } 2879 _IF_ENQUEUE(ifq, m); 2880 IF_UNLOCK(ifq); 2881 if (ifp != NULL && !active) 2882 if_start(ifp); 2883 return (1); 2884 } 2885 2886 void 2887 if_register_com_alloc(u_char type, 2888 if_com_alloc_t *a, if_com_free_t *f) 2889 { 2890 2891 KASSERT(if_com_alloc[type] == NULL, 2892 ("if_register_com_alloc: %d already registered", type)); 2893 KASSERT(if_com_free[type] == NULL, 2894 ("if_register_com_alloc: %d free already registered", type)); 2895 2896 if_com_alloc[type] = a; 2897 if_com_free[type] = f; 2898 } 2899 2900 void 2901 if_deregister_com_alloc(u_char type) 2902 { 2903 2904 KASSERT(if_com_alloc[type] != NULL, 2905 ("if_deregister_com_alloc: %d not registered", type)); 2906 KASSERT(if_com_free[type] != NULL, 2907 ("if_deregister_com_alloc: %d free not registered", type)); 2908 if_com_alloc[type] = NULL; 2909 if_com_free[type] = NULL; 2910 }
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