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