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