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/mac.h> 43 #include <sys/malloc.h> 44 #include <sys/sbuf.h> 45 #include <sys/bus.h> 46 #include <sys/mbuf.h> 47 #include <sys/systm.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 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 86 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 87 88 /* Log link state change events */ 89 static int log_link_state_change = 1; 90 91 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 92 &log_link_state_change, 0, 93 "log interface link state change events"); 94 95 void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 96 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 97 98 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 99 100 static void if_attachdomain(void *); 101 static void if_attachdomain1(struct ifnet *); 102 static int ifconf(u_long, caddr_t); 103 static void if_grow(void); 104 static void if_init(void *); 105 static void if_check(void *); 106 static void if_qflush(struct ifaltq *); 107 static void if_route(struct ifnet *, int flag, int fam); 108 static int if_setflag(struct ifnet *, int, int, int *, int); 109 static void if_slowtimo(void *); 110 static void if_unroute(struct ifnet *, int flag, int fam); 111 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 112 static int if_rtdel(struct radix_node *, void *); 113 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 114 static void if_start_deferred(void *context, int pending); 115 static void do_link_state_change(void *, int); 116 #ifdef INET6 117 /* 118 * XXX: declare here to avoid to include many inet6 related files.. 119 * should be more generalized? 120 */ 121 extern void nd6_setmtu(struct ifnet *); 122 #endif 123 124 int if_index = 0; 125 struct ifindex_entry *ifindex_table = NULL; 126 int ifqmaxlen = IFQ_MAXLEN; 127 struct ifnethead ifnet; /* depend on static init XXX */ 128 struct mtx ifnet_lock; 129 static if_com_alloc_t *if_com_alloc[256]; 130 static if_com_free_t *if_com_free[256]; 131 132 static int if_indexlim = 8; 133 static struct knlist ifklist; 134 135 static void filt_netdetach(struct knote *kn); 136 static int filt_netdev(struct knote *kn, long hint); 137 138 static struct filterops netdev_filtops = 139 { 1, NULL, filt_netdetach, filt_netdev }; 140 141 /* 142 * System initialization 143 */ 144 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 145 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 146 147 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 148 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 149 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 150 151 static d_open_t netopen; 152 static d_close_t netclose; 153 static d_ioctl_t netioctl; 154 static d_kqfilter_t netkqfilter; 155 156 static struct cdevsw net_cdevsw = { 157 .d_version = D_VERSION, 158 .d_flags = D_NEEDGIANT, 159 .d_open = netopen, 160 .d_close = netclose, 161 .d_ioctl = netioctl, 162 .d_name = "net", 163 .d_kqfilter = netkqfilter, 164 }; 165 166 static int 167 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 168 { 169 return (0); 170 } 171 172 static int 173 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 174 { 175 return (0); 176 } 177 178 static int 179 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 180 { 181 struct ifnet *ifp; 182 int error, idx; 183 184 /* only support interface specific ioctls */ 185 if (IOCGROUP(cmd) != 'i') 186 return (EOPNOTSUPP); 187 idx = minor(dev); 188 if (idx == 0) { 189 /* 190 * special network device, not interface. 191 */ 192 if (cmd == SIOCGIFCONF) 193 return (ifconf(cmd, data)); /* XXX remove cmd */ 194 return (EOPNOTSUPP); 195 } 196 197 ifp = ifnet_byindex(idx); 198 if (ifp == NULL) 199 return (ENXIO); 200 201 error = ifhwioctl(cmd, ifp, data, td); 202 if (error == ENOIOCTL) 203 error = EOPNOTSUPP; 204 return (error); 205 } 206 207 static int 208 netkqfilter(struct cdev *dev, struct knote *kn) 209 { 210 struct knlist *klist; 211 struct ifnet *ifp; 212 int idx; 213 214 switch (kn->kn_filter) { 215 case EVFILT_NETDEV: 216 kn->kn_fop = &netdev_filtops; 217 break; 218 default: 219 return (EINVAL); 220 } 221 222 idx = minor(dev); 223 if (idx == 0) { 224 klist = &ifklist; 225 } else { 226 ifp = ifnet_byindex(idx); 227 if (ifp == NULL) 228 return (1); 229 klist = &ifp->if_klist; 230 } 231 232 kn->kn_hook = (caddr_t)klist; 233 234 knlist_add(klist, kn, 0); 235 236 return (0); 237 } 238 239 static void 240 filt_netdetach(struct knote *kn) 241 { 242 struct knlist *klist = (struct knlist *)kn->kn_hook; 243 244 knlist_remove(klist, kn, 0); 245 } 246 247 static int 248 filt_netdev(struct knote *kn, long hint) 249 { 250 struct knlist *klist = (struct knlist *)kn->kn_hook; 251 252 /* 253 * Currently NOTE_EXIT is abused to indicate device detach. 254 */ 255 if (hint == NOTE_EXIT) { 256 kn->kn_data = NOTE_LINKINV; 257 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 258 knlist_remove_inevent(klist, kn); 259 return (1); 260 } 261 if (hint != 0) 262 kn->kn_data = hint; /* current status */ 263 if (kn->kn_sfflags & hint) 264 kn->kn_fflags |= hint; 265 return (kn->kn_fflags != 0); 266 } 267 268 /* 269 * Network interface utility routines. 270 * 271 * Routines with ifa_ifwith* names take sockaddr *'s as 272 * parameters. 273 */ 274 /* ARGSUSED*/ 275 static void 276 if_init(void *dummy __unused) 277 { 278 279 IFNET_LOCK_INIT(); 280 TAILQ_INIT(&ifnet); 281 knlist_init(&ifklist, NULL, NULL, NULL, NULL); 282 if_grow(); /* create initial table */ 283 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 284 UID_ROOT, GID_WHEEL, 0600, "network"); 285 if_clone_init(); 286 } 287 288 static void 289 if_grow(void) 290 { 291 u_int n; 292 struct ifindex_entry *e; 293 294 if_indexlim <<= 1; 295 n = if_indexlim * sizeof(*e); 296 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 297 if (ifindex_table != NULL) { 298 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 299 free((caddr_t)ifindex_table, M_IFNET); 300 } 301 ifindex_table = e; 302 } 303 304 /* ARGSUSED*/ 305 static void 306 if_check(void *dummy __unused) 307 { 308 struct ifnet *ifp; 309 int s; 310 311 s = splimp(); 312 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 313 TAILQ_FOREACH(ifp, &ifnet, if_link) { 314 if (ifp->if_snd.ifq_maxlen == 0) { 315 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 316 ifp->if_snd.ifq_maxlen = ifqmaxlen; 317 } 318 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 319 if_printf(ifp, 320 "XXX: driver didn't initialize queue mtx\n"); 321 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 322 MTX_NETWORK_LOCK, MTX_DEF); 323 } 324 } 325 IFNET_RUNLOCK(); 326 splx(s); 327 if_slowtimo(0); 328 } 329 330 /* 331 * Allocate a struct ifnet and in index for an interface. 332 */ 333 struct ifnet* 334 if_alloc(u_char type) 335 { 336 struct ifnet *ifp; 337 338 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 339 340 /* 341 * Try to find an empty slot below if_index. If we fail, take 342 * the next slot. 343 * 344 * XXX: should be locked! 345 */ 346 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) { 347 if (ifnet_byindex(ifp->if_index) == NULL) 348 break; 349 } 350 /* Catch if_index overflow. */ 351 if (ifp->if_index < 1) { 352 free(ifp, M_IFNET); 353 return (NULL); 354 } 355 if (ifp->if_index > if_index) 356 if_index = ifp->if_index; 357 if (if_index >= if_indexlim) 358 if_grow(); 359 ifnet_byindex(ifp->if_index) = ifp; 360 361 ifp->if_type = type; 362 363 if (if_com_alloc[type] != NULL) { 364 ifp->if_l2com = if_com_alloc[type](type, ifp); 365 if (ifp->if_l2com == NULL) { 366 free(ifp, M_IFNET); 367 return (NULL); 368 } 369 } 370 IF_ADDR_LOCK_INIT(ifp); 371 372 return (ifp); 373 } 374 375 void 376 if_free(struct ifnet *ifp) 377 { 378 379 /* Do not add code to this function! Add it to if_free_type(). */ 380 if_free_type(ifp, ifp->if_type); 381 } 382 383 void 384 if_free_type(struct ifnet *ifp, u_char type) 385 { 386 387 if (ifp != ifnet_byindex(ifp->if_index)) { 388 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 389 __func__); 390 return; 391 } 392 393 IF_ADDR_LOCK_DESTROY(ifp); 394 395 ifnet_byindex(ifp->if_index) = NULL; 396 397 /* XXX: should be locked with if_findindex() */ 398 while (if_index > 0 && ifnet_byindex(if_index) == NULL) 399 if_index--; 400 401 if (if_com_free[type] != NULL) 402 if_com_free[type](ifp->if_l2com, type); 403 404 free(ifp, M_IFNET); 405 }; 406 407 /* 408 * Attach an interface to the 409 * list of "active" interfaces. 410 */ 411 void 412 if_attach(struct ifnet *ifp) 413 { 414 unsigned socksize, ifasize; 415 int namelen, masklen; 416 struct sockaddr_dl *sdl; 417 struct ifaddr *ifa; 418 419 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 420 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 421 ifp->if_xname); 422 423 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 424 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 425 IF_AFDATA_LOCK_INIT(ifp); 426 ifp->if_afdata_initialized = 0; 427 IFNET_WLOCK(); 428 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 429 IFNET_WUNLOCK(); 430 /* 431 * XXX - 432 * The old code would work if the interface passed a pre-existing 433 * chain of ifaddrs to this code. We don't trust our callers to 434 * properly initialize the tailq, however, so we no longer allow 435 * this unlikely case. 436 */ 437 TAILQ_INIT(&ifp->if_addrhead); 438 TAILQ_INIT(&ifp->if_prefixhead); 439 TAILQ_INIT(&ifp->if_multiaddrs); 440 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 441 getmicrotime(&ifp->if_lastchange); 442 ifp->if_data.ifi_epoch = time_uptime; 443 ifp->if_data.ifi_datalen = sizeof(struct if_data); 444 445 #ifdef MAC 446 mac_init_ifnet(ifp); 447 mac_create_ifnet(ifp); 448 #endif 449 450 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 451 unit2minor(ifp->if_index), 452 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 453 net_cdevsw.d_name, ifp->if_xname); 454 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 455 net_cdevsw.d_name, ifp->if_index); 456 457 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 458 459 /* 460 * create a Link Level name for this device 461 */ 462 namelen = strlen(ifp->if_xname); 463 /* 464 * Always save enough space for any possiable name so we can do 465 * a rename in place later. 466 */ 467 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 468 socksize = masklen + ifp->if_addrlen; 469 if (socksize < sizeof(*sdl)) 470 socksize = sizeof(*sdl); 471 socksize = roundup2(socksize, sizeof(long)); 472 ifasize = sizeof(*ifa) + 2 * socksize; 473 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 474 IFA_LOCK_INIT(ifa); 475 sdl = (struct sockaddr_dl *)(ifa + 1); 476 sdl->sdl_len = socksize; 477 sdl->sdl_family = AF_LINK; 478 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 479 sdl->sdl_nlen = namelen; 480 sdl->sdl_index = ifp->if_index; 481 sdl->sdl_type = ifp->if_type; 482 ifp->if_addr = ifa; 483 ifa->ifa_ifp = ifp; 484 ifa->ifa_rtrequest = link_rtrequest; 485 ifa->ifa_addr = (struct sockaddr *)sdl; 486 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 487 ifa->ifa_netmask = (struct sockaddr *)sdl; 488 sdl->sdl_len = masklen; 489 while (namelen != 0) 490 sdl->sdl_data[--namelen] = 0xff; 491 ifa->ifa_refcnt = 1; 492 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 493 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 494 ifp->if_snd.altq_type = 0; 495 ifp->if_snd.altq_disc = NULL; 496 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 497 ifp->if_snd.altq_tbr = NULL; 498 ifp->if_snd.altq_ifp = ifp; 499 500 if (domain_init_status >= 2) 501 if_attachdomain1(ifp); 502 503 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 504 505 /* Announce the interface. */ 506 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 507 } 508 509 static void 510 if_attachdomain(void *dummy) 511 { 512 struct ifnet *ifp; 513 int s; 514 515 s = splnet(); 516 TAILQ_FOREACH(ifp, &ifnet, if_link) 517 if_attachdomain1(ifp); 518 splx(s); 519 } 520 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 521 if_attachdomain, NULL); 522 523 static void 524 if_attachdomain1(struct ifnet *ifp) 525 { 526 struct domain *dp; 527 int s; 528 529 s = splnet(); 530 531 /* 532 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 533 * cannot lock ifp->if_afdata initialization, entirely. 534 */ 535 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 536 splx(s); 537 return; 538 } 539 if (ifp->if_afdata_initialized >= domain_init_status) { 540 IF_AFDATA_UNLOCK(ifp); 541 splx(s); 542 printf("if_attachdomain called more than once on %s\n", 543 ifp->if_xname); 544 return; 545 } 546 ifp->if_afdata_initialized = domain_init_status; 547 IF_AFDATA_UNLOCK(ifp); 548 549 /* address family dependent data region */ 550 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 551 for (dp = domains; dp; dp = dp->dom_next) { 552 if (dp->dom_ifattach) 553 ifp->if_afdata[dp->dom_family] = 554 (*dp->dom_ifattach)(ifp); 555 } 556 557 splx(s); 558 } 559 560 /* 561 * Remove any network addresses from an interface. 562 */ 563 564 void 565 if_purgeaddrs(struct ifnet *ifp) 566 { 567 struct ifaddr *ifa, *next; 568 569 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 570 571 if (ifa->ifa_addr->sa_family == AF_LINK) 572 continue; 573 #ifdef INET 574 /* XXX: Ugly!! ad hoc just for INET */ 575 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 576 struct ifaliasreq ifr; 577 578 bzero(&ifr, sizeof(ifr)); 579 ifr.ifra_addr = *ifa->ifa_addr; 580 if (ifa->ifa_dstaddr) 581 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 582 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 583 NULL) == 0) 584 continue; 585 } 586 #endif /* INET */ 587 #ifdef INET6 588 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 589 in6_purgeaddr(ifa); 590 /* ifp_addrhead is already updated */ 591 continue; 592 } 593 #endif /* INET6 */ 594 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 595 IFAFREE(ifa); 596 } 597 } 598 599 /* 600 * Detach an interface, removing it from the 601 * list of "active" interfaces. 602 * 603 * XXXRW: There are some significant questions about event ordering, and 604 * how to prevent things from starting to use the interface during detach. 605 */ 606 void 607 if_detach(struct ifnet *ifp) 608 { 609 struct ifaddr *ifa; 610 struct radix_node_head *rnh; 611 int s; 612 int i; 613 struct domain *dp; 614 struct ifnet *iter; 615 int found; 616 617 /* 618 * Remove/wait for pending events. 619 */ 620 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 621 622 #ifdef DEV_CARP 623 /* Maybe hook to the generalized departure handler above?!? */ 624 if (ifp->if_carp) 625 carp_ifdetach(ifp); 626 #endif 627 628 /* 629 * Remove routes and flush queues. 630 */ 631 s = splnet(); 632 if_down(ifp); 633 #ifdef ALTQ 634 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 635 altq_disable(&ifp->if_snd); 636 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 637 altq_detach(&ifp->if_snd); 638 #endif 639 640 if_purgeaddrs(ifp); 641 642 #ifdef INET 643 in_ifdetach(ifp); 644 #endif 645 646 #ifdef INET6 647 /* 648 * Remove all IPv6 kernel structs related to ifp. This should be done 649 * before removing routing entries below, since IPv6 interface direct 650 * routes are expected to be removed by the IPv6-specific kernel API. 651 * Otherwise, the kernel will detect some inconsistency and bark it. 652 */ 653 in6_ifdetach(ifp); 654 #endif 655 /* 656 * Remove link ifaddr pointer and maybe decrement if_index. 657 * Clean up all addresses. 658 */ 659 ifp->if_addr = NULL; 660 destroy_dev(ifdev_byindex(ifp->if_index)); 661 ifdev_byindex(ifp->if_index) = NULL; 662 663 /* We can now free link ifaddr. */ 664 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 665 ifa = TAILQ_FIRST(&ifp->if_addrhead); 666 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 667 IFAFREE(ifa); 668 } 669 670 /* 671 * Delete all remaining routes using this interface 672 * Unfortuneatly the only way to do this is to slog through 673 * the entire routing table looking for routes which point 674 * to this interface...oh well... 675 */ 676 for (i = 1; i <= AF_MAX; i++) { 677 if ((rnh = rt_tables[i]) == NULL) 678 continue; 679 RADIX_NODE_HEAD_LOCK(rnh); 680 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 681 RADIX_NODE_HEAD_UNLOCK(rnh); 682 } 683 684 /* Announce that the interface is gone. */ 685 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 686 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 687 688 IF_AFDATA_LOCK(ifp); 689 for (dp = domains; dp; dp = dp->dom_next) { 690 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 691 (*dp->dom_ifdetach)(ifp, 692 ifp->if_afdata[dp->dom_family]); 693 } 694 IF_AFDATA_UNLOCK(ifp); 695 696 #ifdef MAC 697 mac_destroy_ifnet(ifp); 698 #endif /* MAC */ 699 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 700 knlist_clear(&ifp->if_klist, 0); 701 knlist_destroy(&ifp->if_klist); 702 IFNET_WLOCK(); 703 found = 0; 704 TAILQ_FOREACH(iter, &ifnet, if_link) 705 if (iter == ifp) { 706 found = 1; 707 break; 708 } 709 if (found) 710 TAILQ_REMOVE(&ifnet, ifp, if_link); 711 IFNET_WUNLOCK(); 712 mtx_destroy(&ifp->if_snd.ifq_mtx); 713 IF_AFDATA_DESTROY(ifp); 714 splx(s); 715 } 716 717 /* 718 * Delete Routes for a Network Interface 719 * 720 * Called for each routing entry via the rnh->rnh_walktree() call above 721 * to delete all route entries referencing a detaching network interface. 722 * 723 * Arguments: 724 * rn pointer to node in the routing table 725 * arg argument passed to rnh->rnh_walktree() - detaching interface 726 * 727 * Returns: 728 * 0 successful 729 * errno failed - reason indicated 730 * 731 */ 732 static int 733 if_rtdel(struct radix_node *rn, void *arg) 734 { 735 struct rtentry *rt = (struct rtentry *)rn; 736 struct ifnet *ifp = arg; 737 int err; 738 739 if (rt->rt_ifp == ifp) { 740 741 /* 742 * Protect (sorta) against walktree recursion problems 743 * with cloned routes 744 */ 745 if ((rt->rt_flags & RTF_UP) == 0) 746 return (0); 747 748 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 749 rt_mask(rt), rt->rt_flags, 750 (struct rtentry **) NULL); 751 if (err) { 752 log(LOG_WARNING, "if_rtdel: error %d\n", err); 753 } 754 } 755 756 return (0); 757 } 758 759 #define sa_equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 760 761 /* 762 * Locate an interface based on a complete address. 763 */ 764 /*ARGSUSED*/ 765 struct ifaddr * 766 ifa_ifwithaddr(struct sockaddr *addr) 767 { 768 struct ifnet *ifp; 769 struct ifaddr *ifa; 770 771 IFNET_RLOCK(); 772 TAILQ_FOREACH(ifp, &ifnet, if_link) 773 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 774 if (ifa->ifa_addr->sa_family != addr->sa_family) 775 continue; 776 if (sa_equal(addr, ifa->ifa_addr)) 777 goto done; 778 /* IP6 doesn't have broadcast */ 779 if ((ifp->if_flags & IFF_BROADCAST) && 780 ifa->ifa_broadaddr && 781 ifa->ifa_broadaddr->sa_len != 0 && 782 sa_equal(ifa->ifa_broadaddr, addr)) 783 goto done; 784 } 785 ifa = NULL; 786 done: 787 IFNET_RUNLOCK(); 788 return (ifa); 789 } 790 791 /* 792 * Locate the point to point interface with a given destination address. 793 */ 794 /*ARGSUSED*/ 795 struct ifaddr * 796 ifa_ifwithdstaddr(struct sockaddr *addr) 797 { 798 struct ifnet *ifp; 799 struct ifaddr *ifa; 800 801 IFNET_RLOCK(); 802 TAILQ_FOREACH(ifp, &ifnet, if_link) { 803 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 804 continue; 805 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 806 if (ifa->ifa_addr->sa_family != addr->sa_family) 807 continue; 808 if (ifa->ifa_dstaddr && 809 sa_equal(addr, ifa->ifa_dstaddr)) 810 goto done; 811 } 812 } 813 ifa = NULL; 814 done: 815 IFNET_RUNLOCK(); 816 return (ifa); 817 } 818 819 /* 820 * Find an interface on a specific network. If many, choice 821 * is most specific found. 822 */ 823 struct ifaddr * 824 ifa_ifwithnet(struct sockaddr *addr) 825 { 826 struct ifnet *ifp; 827 struct ifaddr *ifa; 828 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 829 u_int af = addr->sa_family; 830 char *addr_data = addr->sa_data, *cplim; 831 832 /* 833 * AF_LINK addresses can be looked up directly by their index number, 834 * so do that if we can. 835 */ 836 if (af == AF_LINK) { 837 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 838 if (sdl->sdl_index && sdl->sdl_index <= if_index) 839 return (ifaddr_byindex(sdl->sdl_index)); 840 } 841 842 /* 843 * Scan though each interface, looking for ones that have 844 * addresses in this address family. 845 */ 846 IFNET_RLOCK(); 847 TAILQ_FOREACH(ifp, &ifnet, if_link) { 848 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 849 char *cp, *cp2, *cp3; 850 851 if (ifa->ifa_addr->sa_family != af) 852 next: continue; 853 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 854 /* 855 * This is a bit broken as it doesn't 856 * take into account that the remote end may 857 * be a single node in the network we are 858 * looking for. 859 * The trouble is that we don't know the 860 * netmask for the remote end. 861 */ 862 if (ifa->ifa_dstaddr != 0 && 863 sa_equal(addr, ifa->ifa_dstaddr)) 864 goto done; 865 } else { 866 /* 867 * if we have a special address handler, 868 * then use it instead of the generic one. 869 */ 870 if (ifa->ifa_claim_addr) { 871 if ((*ifa->ifa_claim_addr)(ifa, addr)) 872 goto done; 873 continue; 874 } 875 876 /* 877 * Scan all the bits in the ifa's address. 878 * If a bit dissagrees with what we are 879 * looking for, mask it with the netmask 880 * to see if it really matters. 881 * (A byte at a time) 882 */ 883 if (ifa->ifa_netmask == 0) 884 continue; 885 cp = addr_data; 886 cp2 = ifa->ifa_addr->sa_data; 887 cp3 = ifa->ifa_netmask->sa_data; 888 cplim = ifa->ifa_netmask->sa_len 889 + (char *)ifa->ifa_netmask; 890 while (cp3 < cplim) 891 if ((*cp++ ^ *cp2++) & *cp3++) 892 goto next; /* next address! */ 893 /* 894 * If the netmask of what we just found 895 * is more specific than what we had before 896 * (if we had one) then remember the new one 897 * before continuing to search 898 * for an even better one. 899 */ 900 if (ifa_maybe == 0 || 901 rn_refines((caddr_t)ifa->ifa_netmask, 902 (caddr_t)ifa_maybe->ifa_netmask)) 903 ifa_maybe = ifa; 904 } 905 } 906 } 907 ifa = ifa_maybe; 908 done: 909 IFNET_RUNLOCK(); 910 return (ifa); 911 } 912 913 /* 914 * Find an interface address specific to an interface best matching 915 * a given address. 916 */ 917 struct ifaddr * 918 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 919 { 920 struct ifaddr *ifa; 921 char *cp, *cp2, *cp3; 922 char *cplim; 923 struct ifaddr *ifa_maybe = 0; 924 u_int af = addr->sa_family; 925 926 if (af >= AF_MAX) 927 return (0); 928 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 929 if (ifa->ifa_addr->sa_family != af) 930 continue; 931 if (ifa_maybe == 0) 932 ifa_maybe = ifa; 933 if (ifa->ifa_netmask == 0) { 934 if (sa_equal(addr, ifa->ifa_addr) || 935 (ifa->ifa_dstaddr && 936 sa_equal(addr, ifa->ifa_dstaddr))) 937 goto done; 938 continue; 939 } 940 if (ifp->if_flags & IFF_POINTOPOINT) { 941 if (sa_equal(addr, ifa->ifa_dstaddr)) 942 goto done; 943 } else { 944 cp = addr->sa_data; 945 cp2 = ifa->ifa_addr->sa_data; 946 cp3 = ifa->ifa_netmask->sa_data; 947 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 948 for (; cp3 < cplim; cp3++) 949 if ((*cp++ ^ *cp2++) & *cp3) 950 break; 951 if (cp3 == cplim) 952 goto done; 953 } 954 } 955 ifa = ifa_maybe; 956 done: 957 return (ifa); 958 } 959 960 #include <net/route.h> 961 962 /* 963 * Default action when installing a route with a Link Level gateway. 964 * Lookup an appropriate real ifa to point to. 965 * This should be moved to /sys/net/link.c eventually. 966 */ 967 static void 968 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 969 { 970 struct ifaddr *ifa, *oifa; 971 struct sockaddr *dst; 972 struct ifnet *ifp; 973 974 RT_LOCK_ASSERT(rt); 975 976 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 977 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 978 return; 979 ifa = ifaof_ifpforaddr(dst, ifp); 980 if (ifa) { 981 IFAREF(ifa); /* XXX */ 982 oifa = rt->rt_ifa; 983 rt->rt_ifa = ifa; 984 IFAFREE(oifa); 985 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 986 ifa->ifa_rtrequest(cmd, rt, info); 987 } 988 } 989 990 /* 991 * Mark an interface down and notify protocols of 992 * the transition. 993 * NOTE: must be called at splnet or eqivalent. 994 */ 995 static void 996 if_unroute(struct ifnet *ifp, int flag, int fam) 997 { 998 struct ifaddr *ifa; 999 1000 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1001 1002 ifp->if_flags &= ~flag; 1003 getmicrotime(&ifp->if_lastchange); 1004 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1005 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1006 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1007 if_qflush(&ifp->if_snd); 1008 #ifdef DEV_CARP 1009 if (ifp->if_carp) 1010 carp_carpdev_state(ifp->if_carp); 1011 #endif 1012 rt_ifmsg(ifp); 1013 } 1014 1015 /* 1016 * Mark an interface up and notify protocols of 1017 * the transition. 1018 * NOTE: must be called at splnet or eqivalent. 1019 */ 1020 static void 1021 if_route(struct ifnet *ifp, int flag, int fam) 1022 { 1023 struct ifaddr *ifa; 1024 1025 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1026 1027 ifp->if_flags |= flag; 1028 getmicrotime(&ifp->if_lastchange); 1029 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1030 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1031 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1032 #ifdef DEV_CARP 1033 if (ifp->if_carp) 1034 carp_carpdev_state(ifp->if_carp); 1035 #endif 1036 rt_ifmsg(ifp); 1037 #ifdef INET6 1038 in6_if_up(ifp); 1039 #endif 1040 } 1041 1042 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1043 1044 /* 1045 * Handle a change in the interface link state. To avoid LORs 1046 * between driver lock and upper layer locks, as well as possible 1047 * recursions, we post event to taskqueue, and all job 1048 * is done in static do_link_state_change(). 1049 */ 1050 void 1051 if_link_state_change(struct ifnet *ifp, int link_state) 1052 { 1053 /* Return if state hasn't changed. */ 1054 if (ifp->if_link_state == link_state) 1055 return; 1056 1057 ifp->if_link_state = link_state; 1058 1059 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1060 } 1061 1062 static void 1063 do_link_state_change(void *arg, int pending) 1064 { 1065 struct ifnet *ifp = (struct ifnet *)arg; 1066 int link_state = ifp->if_link_state; 1067 int link; 1068 1069 /* Notify that the link state has changed. */ 1070 rt_ifmsg(ifp); 1071 if (link_state == LINK_STATE_UP) 1072 link = NOTE_LINKUP; 1073 else if (link_state == LINK_STATE_DOWN) 1074 link = NOTE_LINKDOWN; 1075 else 1076 link = NOTE_LINKINV; 1077 KNOTE_UNLOCKED(&ifp->if_klist, link); 1078 if (ifp->if_nvlans != 0) 1079 (*vlan_link_state_p)(ifp, link); 1080 1081 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1082 IFP2AC(ifp)->ac_netgraph != NULL) 1083 (*ng_ether_link_state_p)(ifp, link_state); 1084 #ifdef DEV_CARP 1085 if (ifp->if_carp) 1086 carp_carpdev_state(ifp->if_carp); 1087 #endif 1088 if (ifp->if_bridge) { 1089 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1090 (*bstp_linkstate_p)(ifp, link_state); 1091 } 1092 1093 devctl_notify("IFNET", ifp->if_xname, 1094 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1095 if (pending > 1) 1096 if_printf(ifp, "%d link states coalesced\n", pending); 1097 if (log_link_state_change) 1098 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1099 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1100 } 1101 1102 /* 1103 * Mark an interface down and notify protocols of 1104 * the transition. 1105 * NOTE: must be called at splnet or eqivalent. 1106 */ 1107 void 1108 if_down(struct ifnet *ifp) 1109 { 1110 1111 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1112 } 1113 1114 /* 1115 * Mark an interface up and notify protocols of 1116 * the transition. 1117 * NOTE: must be called at splnet or eqivalent. 1118 */ 1119 void 1120 if_up(struct ifnet *ifp) 1121 { 1122 1123 if_route(ifp, IFF_UP, AF_UNSPEC); 1124 } 1125 1126 /* 1127 * Flush an interface queue. 1128 */ 1129 static void 1130 if_qflush(struct ifaltq *ifq) 1131 { 1132 struct mbuf *m, *n; 1133 1134 IFQ_LOCK(ifq); 1135 #ifdef ALTQ 1136 if (ALTQ_IS_ENABLED(ifq)) 1137 ALTQ_PURGE(ifq); 1138 #endif 1139 n = ifq->ifq_head; 1140 while ((m = n) != 0) { 1141 n = m->m_act; 1142 m_freem(m); 1143 } 1144 ifq->ifq_head = 0; 1145 ifq->ifq_tail = 0; 1146 ifq->ifq_len = 0; 1147 IFQ_UNLOCK(ifq); 1148 } 1149 1150 /* 1151 * Handle interface watchdog timer routines. Called 1152 * from softclock, we decrement timers (if set) and 1153 * call the appropriate interface routine on expiration. 1154 * 1155 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1156 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1157 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1158 */ 1159 static void 1160 if_slowtimo(void *arg) 1161 { 1162 struct ifnet *ifp; 1163 int s = splimp(); 1164 1165 IFNET_RLOCK(); 1166 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1167 if (ifp->if_timer == 0 || --ifp->if_timer) 1168 continue; 1169 if (ifp->if_watchdog) 1170 (*ifp->if_watchdog)(ifp); 1171 } 1172 IFNET_RUNLOCK(); 1173 splx(s); 1174 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1175 } 1176 1177 /* 1178 * Map interface name to 1179 * interface structure pointer. 1180 */ 1181 struct ifnet * 1182 ifunit(const char *name) 1183 { 1184 struct ifnet *ifp; 1185 1186 IFNET_RLOCK(); 1187 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1188 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1189 break; 1190 } 1191 IFNET_RUNLOCK(); 1192 return (ifp); 1193 } 1194 1195 /* 1196 * Hardware specific interface ioctls. 1197 */ 1198 static int 1199 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1200 { 1201 struct ifreq *ifr; 1202 struct ifstat *ifs; 1203 int error = 0; 1204 int new_flags, temp_flags; 1205 size_t namelen, onamelen; 1206 char new_name[IFNAMSIZ]; 1207 struct ifaddr *ifa; 1208 struct sockaddr_dl *sdl; 1209 1210 ifr = (struct ifreq *)data; 1211 switch (cmd) { 1212 case SIOCGIFINDEX: 1213 ifr->ifr_index = ifp->if_index; 1214 break; 1215 1216 case SIOCGIFFLAGS: 1217 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1218 ifr->ifr_flags = temp_flags & 0xffff; 1219 ifr->ifr_flagshigh = temp_flags >> 16; 1220 break; 1221 1222 case SIOCGIFCAP: 1223 ifr->ifr_reqcap = ifp->if_capabilities; 1224 ifr->ifr_curcap = ifp->if_capenable; 1225 break; 1226 1227 #ifdef MAC 1228 case SIOCGIFMAC: 1229 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1230 break; 1231 #endif 1232 1233 case SIOCGIFMETRIC: 1234 ifr->ifr_metric = ifp->if_metric; 1235 break; 1236 1237 case SIOCGIFMTU: 1238 ifr->ifr_mtu = ifp->if_mtu; 1239 break; 1240 1241 case SIOCGIFPHYS: 1242 ifr->ifr_phys = ifp->if_physical; 1243 break; 1244 1245 case SIOCSIFFLAGS: 1246 error = suser(td); 1247 if (error) 1248 return (error); 1249 /* 1250 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1251 * check, so we don't need special handling here yet. 1252 */ 1253 new_flags = (ifr->ifr_flags & 0xffff) | 1254 (ifr->ifr_flagshigh << 16); 1255 if (ifp->if_flags & IFF_SMART) { 1256 /* Smart drivers twiddle their own routes */ 1257 } else if (ifp->if_flags & IFF_UP && 1258 (new_flags & IFF_UP) == 0) { 1259 int s = splimp(); 1260 if_down(ifp); 1261 splx(s); 1262 } else if (new_flags & IFF_UP && 1263 (ifp->if_flags & IFF_UP) == 0) { 1264 int s = splimp(); 1265 if_up(ifp); 1266 splx(s); 1267 } 1268 /* See if permanently promiscuous mode bit is about to flip */ 1269 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 1270 if (new_flags & IFF_PPROMISC) 1271 ifp->if_flags |= IFF_PROMISC; 1272 else if (ifp->if_pcount == 0) 1273 ifp->if_flags &= ~IFF_PROMISC; 1274 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 1275 ifp->if_xname, 1276 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 1277 } 1278 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1279 (new_flags &~ IFF_CANTCHANGE); 1280 if (ifp->if_ioctl) { 1281 IFF_LOCKGIANT(ifp); 1282 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1283 IFF_UNLOCKGIANT(ifp); 1284 } 1285 getmicrotime(&ifp->if_lastchange); 1286 break; 1287 1288 case SIOCSIFCAP: 1289 error = suser(td); 1290 if (error) 1291 return (error); 1292 if (ifp->if_ioctl == NULL) 1293 return (EOPNOTSUPP); 1294 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1295 return (EINVAL); 1296 IFF_LOCKGIANT(ifp); 1297 error = (*ifp->if_ioctl)(ifp, cmd, data); 1298 IFF_UNLOCKGIANT(ifp); 1299 if (error == 0) 1300 getmicrotime(&ifp->if_lastchange); 1301 break; 1302 1303 #ifdef MAC 1304 case SIOCSIFMAC: 1305 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1306 break; 1307 #endif 1308 1309 case SIOCSIFNAME: 1310 error = suser(td); 1311 if (error != 0) 1312 return (error); 1313 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1314 if (error != 0) 1315 return (error); 1316 if (new_name[0] == '\0') 1317 return (EINVAL); 1318 if (ifunit(new_name) != NULL) 1319 return (EEXIST); 1320 1321 /* Announce the departure of the interface. */ 1322 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1323 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1324 1325 log(LOG_INFO, "%s: changing name to '%s'\n", 1326 ifp->if_xname, new_name); 1327 1328 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1329 ifa = ifp->if_addr; 1330 IFA_LOCK(ifa); 1331 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1332 namelen = strlen(new_name); 1333 onamelen = sdl->sdl_nlen; 1334 /* 1335 * Move the address if needed. This is safe because we 1336 * allocate space for a name of length IFNAMSIZ when we 1337 * create this in if_attach(). 1338 */ 1339 if (namelen != onamelen) { 1340 bcopy(sdl->sdl_data + onamelen, 1341 sdl->sdl_data + namelen, sdl->sdl_alen); 1342 } 1343 bcopy(new_name, sdl->sdl_data, namelen); 1344 sdl->sdl_nlen = namelen; 1345 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1346 bzero(sdl->sdl_data, onamelen); 1347 while (namelen != 0) 1348 sdl->sdl_data[--namelen] = 0xff; 1349 IFA_UNLOCK(ifa); 1350 1351 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1352 /* Announce the return of the interface. */ 1353 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1354 break; 1355 1356 case SIOCSIFMETRIC: 1357 error = suser(td); 1358 if (error) 1359 return (error); 1360 ifp->if_metric = ifr->ifr_metric; 1361 getmicrotime(&ifp->if_lastchange); 1362 break; 1363 1364 case SIOCSIFPHYS: 1365 error = suser(td); 1366 if (error) 1367 return (error); 1368 if (ifp->if_ioctl == NULL) 1369 return (EOPNOTSUPP); 1370 IFF_LOCKGIANT(ifp); 1371 error = (*ifp->if_ioctl)(ifp, cmd, data); 1372 IFF_UNLOCKGIANT(ifp); 1373 if (error == 0) 1374 getmicrotime(&ifp->if_lastchange); 1375 break; 1376 1377 case SIOCSIFMTU: 1378 { 1379 u_long oldmtu = ifp->if_mtu; 1380 1381 error = suser(td); 1382 if (error) 1383 return (error); 1384 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1385 return (EINVAL); 1386 if (ifp->if_ioctl == NULL) 1387 return (EOPNOTSUPP); 1388 IFF_LOCKGIANT(ifp); 1389 error = (*ifp->if_ioctl)(ifp, cmd, data); 1390 IFF_UNLOCKGIANT(ifp); 1391 if (error == 0) { 1392 getmicrotime(&ifp->if_lastchange); 1393 rt_ifmsg(ifp); 1394 } 1395 /* 1396 * If the link MTU changed, do network layer specific procedure. 1397 */ 1398 if (ifp->if_mtu != oldmtu) { 1399 #ifdef INET6 1400 nd6_setmtu(ifp); 1401 #endif 1402 } 1403 break; 1404 } 1405 1406 case SIOCADDMULTI: 1407 case SIOCDELMULTI: 1408 error = suser(td); 1409 if (error) 1410 return (error); 1411 1412 /* Don't allow group membership on non-multicast interfaces. */ 1413 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1414 return (EOPNOTSUPP); 1415 1416 /* Don't let users screw up protocols' entries. */ 1417 if (ifr->ifr_addr.sa_family != AF_LINK) 1418 return (EINVAL); 1419 1420 if (cmd == SIOCADDMULTI) { 1421 struct ifmultiaddr *ifma; 1422 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1423 } else { 1424 error = if_delmulti(ifp, &ifr->ifr_addr); 1425 } 1426 if (error == 0) 1427 getmicrotime(&ifp->if_lastchange); 1428 break; 1429 1430 case SIOCSIFPHYADDR: 1431 case SIOCDIFPHYADDR: 1432 #ifdef INET6 1433 case SIOCSIFPHYADDR_IN6: 1434 #endif 1435 case SIOCSLIFPHYADDR: 1436 case SIOCSIFMEDIA: 1437 case SIOCSIFGENERIC: 1438 error = suser(td); 1439 if (error) 1440 return (error); 1441 if (ifp->if_ioctl == NULL) 1442 return (EOPNOTSUPP); 1443 IFF_LOCKGIANT(ifp); 1444 error = (*ifp->if_ioctl)(ifp, cmd, data); 1445 IFF_UNLOCKGIANT(ifp); 1446 if (error == 0) 1447 getmicrotime(&ifp->if_lastchange); 1448 break; 1449 1450 case SIOCGIFSTATUS: 1451 ifs = (struct ifstat *)data; 1452 ifs->ascii[0] = '\0'; 1453 1454 case SIOCGIFPSRCADDR: 1455 case SIOCGIFPDSTADDR: 1456 case SIOCGLIFPHYADDR: 1457 case SIOCGIFMEDIA: 1458 case SIOCGIFGENERIC: 1459 if (ifp->if_ioctl == NULL) 1460 return (EOPNOTSUPP); 1461 IFF_LOCKGIANT(ifp); 1462 error = (*ifp->if_ioctl)(ifp, cmd, data); 1463 IFF_UNLOCKGIANT(ifp); 1464 break; 1465 1466 case SIOCSIFLLADDR: 1467 error = suser(td); 1468 if (error) 1469 return (error); 1470 error = if_setlladdr(ifp, 1471 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1472 break; 1473 1474 default: 1475 error = ENOIOCTL; 1476 break; 1477 } 1478 return (error); 1479 } 1480 1481 /* 1482 * Interface ioctls. 1483 */ 1484 int 1485 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1486 { 1487 struct ifnet *ifp; 1488 struct ifreq *ifr; 1489 int error; 1490 int oif_flags; 1491 1492 switch (cmd) { 1493 case SIOCGIFCONF: 1494 case OSIOCGIFCONF: 1495 return (ifconf(cmd, data)); 1496 } 1497 ifr = (struct ifreq *)data; 1498 1499 switch (cmd) { 1500 case SIOCIFCREATE: 1501 case SIOCIFDESTROY: 1502 if ((error = suser(td)) != 0) 1503 return (error); 1504 return ((cmd == SIOCIFCREATE) ? 1505 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1506 if_clone_destroy(ifr->ifr_name)); 1507 1508 case SIOCIFGCLONERS: 1509 return (if_clone_list((struct if_clonereq *)data)); 1510 } 1511 1512 ifp = ifunit(ifr->ifr_name); 1513 if (ifp == 0) 1514 return (ENXIO); 1515 1516 error = ifhwioctl(cmd, ifp, data, td); 1517 if (error != ENOIOCTL) 1518 return (error); 1519 1520 oif_flags = ifp->if_flags; 1521 if (so->so_proto == 0) 1522 return (EOPNOTSUPP); 1523 #ifndef COMPAT_43 1524 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1525 data, 1526 ifp, td)); 1527 #else 1528 { 1529 int ocmd = cmd; 1530 1531 switch (cmd) { 1532 1533 case SIOCSIFDSTADDR: 1534 case SIOCSIFADDR: 1535 case SIOCSIFBRDADDR: 1536 case SIOCSIFNETMASK: 1537 #if BYTE_ORDER != BIG_ENDIAN 1538 if (ifr->ifr_addr.sa_family == 0 && 1539 ifr->ifr_addr.sa_len < 16) { 1540 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1541 ifr->ifr_addr.sa_len = 16; 1542 } 1543 #else 1544 if (ifr->ifr_addr.sa_len == 0) 1545 ifr->ifr_addr.sa_len = 16; 1546 #endif 1547 break; 1548 1549 case OSIOCGIFADDR: 1550 cmd = SIOCGIFADDR; 1551 break; 1552 1553 case OSIOCGIFDSTADDR: 1554 cmd = SIOCGIFDSTADDR; 1555 break; 1556 1557 case OSIOCGIFBRDADDR: 1558 cmd = SIOCGIFBRDADDR; 1559 break; 1560 1561 case OSIOCGIFNETMASK: 1562 cmd = SIOCGIFNETMASK; 1563 } 1564 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1565 cmd, 1566 data, 1567 ifp, td)); 1568 switch (ocmd) { 1569 1570 case OSIOCGIFADDR: 1571 case OSIOCGIFDSTADDR: 1572 case OSIOCGIFBRDADDR: 1573 case OSIOCGIFNETMASK: 1574 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1575 1576 } 1577 } 1578 #endif /* COMPAT_43 */ 1579 1580 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1581 #ifdef INET6 1582 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1583 if (ifp->if_flags & IFF_UP) { 1584 int s = splimp(); 1585 in6_if_up(ifp); 1586 splx(s); 1587 } 1588 #endif 1589 } 1590 return (error); 1591 } 1592 1593 /* 1594 * The code common to handling reference counted flags, 1595 * e.g., in ifpromisc() and if_allmulti(). 1596 * The "pflag" argument can specify a permanent mode flag to check, 1597 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 1598 * 1599 * Only to be used on stack-owned flags, not driver-owned flags. 1600 */ 1601 static int 1602 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 1603 { 1604 struct ifreq ifr; 1605 int error; 1606 int oldflags, oldcount; 1607 1608 /* Sanity checks to catch programming errors */ 1609 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 1610 ("%s: setting driver-owned flag %d", __func__, flag)); 1611 1612 if (onswitch) 1613 KASSERT(*refcount >= 0, 1614 ("%s: increment negative refcount %d for flag %d", 1615 __func__, *refcount, flag)); 1616 else 1617 KASSERT(*refcount > 0, 1618 ("%s: decrement non-positive refcount %d for flag %d", 1619 __func__, *refcount, flag)); 1620 1621 /* In case this mode is permanent, just touch refcount */ 1622 if (ifp->if_flags & pflag) { 1623 *refcount += onswitch ? 1 : -1; 1624 return (0); 1625 } 1626 1627 /* Save ifnet parameters for if_ioctl() may fail */ 1628 oldcount = *refcount; 1629 oldflags = ifp->if_flags; 1630 1631 /* 1632 * See if we aren't the only and touching refcount is enough. 1633 * Actually toggle interface flag if we are the first or last. 1634 */ 1635 if (onswitch) { 1636 if ((*refcount)++) 1637 return (0); 1638 ifp->if_flags |= flag; 1639 } else { 1640 if (--(*refcount)) 1641 return (0); 1642 ifp->if_flags &= ~flag; 1643 } 1644 1645 /* Call down the driver since we've changed interface flags */ 1646 if (ifp->if_ioctl == NULL) { 1647 error = EOPNOTSUPP; 1648 goto recover; 1649 } 1650 ifr.ifr_flags = ifp->if_flags & 0xffff; 1651 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1652 IFF_LOCKGIANT(ifp); 1653 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1654 IFF_UNLOCKGIANT(ifp); 1655 if (error) 1656 goto recover; 1657 /* Notify userland that interface flags have changed */ 1658 rt_ifmsg(ifp); 1659 return (0); 1660 1661 recover: 1662 /* Recover after driver error */ 1663 *refcount = oldcount; 1664 ifp->if_flags = oldflags; 1665 return (error); 1666 } 1667 1668 /* 1669 * Set/clear promiscuous mode on interface ifp based on the truth value 1670 * of pswitch. The calls are reference counted so that only the first 1671 * "on" request actually has an effect, as does the final "off" request. 1672 * Results are undefined if the "off" and "on" requests are not matched. 1673 */ 1674 int 1675 ifpromisc(struct ifnet *ifp, int pswitch) 1676 { 1677 int error; 1678 int oldflags = ifp->if_flags; 1679 1680 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 1681 &ifp->if_pcount, pswitch); 1682 /* If promiscuous mode status has changed, log a message */ 1683 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 1684 log(LOG_INFO, "%s: promiscuous mode %s\n", 1685 ifp->if_xname, 1686 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1687 return (error); 1688 } 1689 1690 /* 1691 * Return interface configuration 1692 * of system. List may be used 1693 * in later ioctl's (above) to get 1694 * other information. 1695 */ 1696 /*ARGSUSED*/ 1697 static int 1698 ifconf(u_long cmd, caddr_t data) 1699 { 1700 struct ifconf *ifc = (struct ifconf *)data; 1701 struct ifnet *ifp; 1702 struct ifaddr *ifa; 1703 struct ifreq ifr; 1704 struct sbuf *sb; 1705 int error, full = 0, valid_len, max_len; 1706 1707 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 1708 max_len = MAXPHYS - 1; 1709 1710 /* Prevent hostile input from being able to crash the system */ 1711 if (ifc->ifc_len <= 0) 1712 return (EINVAL); 1713 1714 again: 1715 if (ifc->ifc_len <= max_len) { 1716 max_len = ifc->ifc_len; 1717 full = 1; 1718 } 1719 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 1720 max_len = 0; 1721 valid_len = 0; 1722 1723 IFNET_RLOCK(); /* could sleep XXX */ 1724 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1725 int addrs; 1726 1727 /* 1728 * Zero the ifr_name buffer to make sure we don't 1729 * disclose the contents of the stack. 1730 */ 1731 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 1732 1733 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1734 >= sizeof(ifr.ifr_name)) { 1735 sbuf_delete(sb); 1736 IFNET_RUNLOCK(); 1737 return (ENAMETOOLONG); 1738 } 1739 1740 addrs = 0; 1741 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1742 struct sockaddr *sa = ifa->ifa_addr; 1743 1744 if (jailed(curthread->td_ucred) && 1745 prison_if(curthread->td_ucred, sa)) 1746 continue; 1747 addrs++; 1748 #ifdef COMPAT_43 1749 if (cmd == OSIOCGIFCONF) { 1750 struct osockaddr *osa = 1751 (struct osockaddr *)&ifr.ifr_addr; 1752 ifr.ifr_addr = *sa; 1753 osa->sa_family = sa->sa_family; 1754 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1755 max_len += sizeof(ifr); 1756 } else 1757 #endif 1758 if (sa->sa_len <= sizeof(*sa)) { 1759 ifr.ifr_addr = *sa; 1760 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1761 max_len += sizeof(ifr); 1762 } else { 1763 sbuf_bcat(sb, &ifr, 1764 offsetof(struct ifreq, ifr_addr)); 1765 max_len += offsetof(struct ifreq, ifr_addr); 1766 sbuf_bcat(sb, sa, sa->sa_len); 1767 max_len += sa->sa_len; 1768 } 1769 1770 if (!sbuf_overflowed(sb)) 1771 valid_len = sbuf_len(sb); 1772 } 1773 if (addrs == 0) { 1774 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1775 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1776 max_len += sizeof(ifr); 1777 1778 if (!sbuf_overflowed(sb)) 1779 valid_len = sbuf_len(sb); 1780 } 1781 } 1782 IFNET_RUNLOCK(); 1783 1784 /* 1785 * If we didn't allocate enough space (uncommon), try again. If 1786 * we have already allocated as much space as we are allowed, 1787 * return what we've got. 1788 */ 1789 if (valid_len != max_len && !full) { 1790 sbuf_delete(sb); 1791 goto again; 1792 } 1793 1794 ifc->ifc_len = valid_len; 1795 sbuf_finish(sb); 1796 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 1797 sbuf_delete(sb); 1798 return (error); 1799 } 1800 1801 /* 1802 * Just like ifpromisc(), but for all-multicast-reception mode. 1803 */ 1804 int 1805 if_allmulti(struct ifnet *ifp, int onswitch) 1806 { 1807 1808 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 1809 } 1810 1811 static struct ifmultiaddr * 1812 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 1813 { 1814 struct ifmultiaddr *ifma; 1815 1816 IF_ADDR_LOCK_ASSERT(ifp); 1817 1818 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1819 if (sa_equal(ifma->ifma_addr, sa)) 1820 break; 1821 } 1822 1823 return ifma; 1824 } 1825 1826 /* 1827 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 1828 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 1829 * the ifnet multicast address list here, so the caller must do that and 1830 * other setup work (such as notifying the device driver). The reference 1831 * count is initialized to 1. 1832 */ 1833 static struct ifmultiaddr * 1834 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 1835 int mflags) 1836 { 1837 struct ifmultiaddr *ifma; 1838 struct sockaddr *dupsa; 1839 1840 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags | 1841 M_ZERO); 1842 if (ifma == NULL) 1843 return (NULL); 1844 1845 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags); 1846 if (dupsa == NULL) { 1847 FREE(ifma, M_IFMADDR); 1848 return (NULL); 1849 } 1850 bcopy(sa, dupsa, sa->sa_len); 1851 ifma->ifma_addr = dupsa; 1852 1853 ifma->ifma_ifp = ifp; 1854 ifma->ifma_refcount = 1; 1855 ifma->ifma_protospec = NULL; 1856 1857 if (llsa == NULL) { 1858 ifma->ifma_lladdr = NULL; 1859 return (ifma); 1860 } 1861 1862 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags); 1863 if (dupsa == NULL) { 1864 FREE(ifma->ifma_addr, M_IFMADDR); 1865 FREE(ifma, M_IFMADDR); 1866 return (NULL); 1867 } 1868 bcopy(llsa, dupsa, llsa->sa_len); 1869 ifma->ifma_lladdr = dupsa; 1870 1871 return (ifma); 1872 } 1873 1874 /* 1875 * if_freemulti: free ifmultiaddr structure and possibly attached related 1876 * addresses. The caller is responsible for implementing reference 1877 * counting, notifying the driver, handling routing messages, and releasing 1878 * any dependent link layer state. 1879 */ 1880 static void 1881 if_freemulti(struct ifmultiaddr *ifma) 1882 { 1883 1884 KASSERT(ifma->ifma_refcount == 1, ("if_freemulti: refcount %d", 1885 ifma->ifma_refcount)); 1886 KASSERT(ifma->ifma_protospec == NULL, 1887 ("if_freemulti: protospec not NULL")); 1888 1889 if (ifma->ifma_lladdr != NULL) 1890 FREE(ifma->ifma_lladdr, M_IFMADDR); 1891 FREE(ifma->ifma_addr, M_IFMADDR); 1892 FREE(ifma, M_IFMADDR); 1893 } 1894 1895 /* 1896 * Register an additional multicast address with a network interface. 1897 * 1898 * - If the address is already present, bump the reference count on the 1899 * address and return. 1900 * - If the address is not link-layer, look up a link layer address. 1901 * - Allocate address structures for one or both addresses, and attach to the 1902 * multicast address list on the interface. If automatically adding a link 1903 * layer address, the protocol address will own a reference to the link 1904 * layer address, to be freed when it is freed. 1905 * - Notify the network device driver of an addition to the multicast address 1906 * list. 1907 * 1908 * 'sa' points to caller-owned memory with the desired multicast address. 1909 * 1910 * 'retifma' will be used to return a pointer to the resulting multicast 1911 * address reference, if desired. 1912 */ 1913 int 1914 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 1915 struct ifmultiaddr **retifma) 1916 { 1917 struct ifmultiaddr *ifma, *ll_ifma; 1918 struct sockaddr *llsa; 1919 int error; 1920 1921 /* 1922 * If the address is already present, return a new reference to it; 1923 * otherwise, allocate storage and set up a new address. 1924 */ 1925 IF_ADDR_LOCK(ifp); 1926 ifma = if_findmulti(ifp, sa); 1927 if (ifma != NULL) { 1928 ifma->ifma_refcount++; 1929 if (retifma != NULL) 1930 *retifma = ifma; 1931 IF_ADDR_UNLOCK(ifp); 1932 return (0); 1933 } 1934 1935 /* 1936 * The address isn't already present; resolve the protocol address 1937 * into a link layer address, and then look that up, bump its 1938 * refcount or allocate an ifma for that also. If 'llsa' was 1939 * returned, we will need to free it later. 1940 */ 1941 llsa = NULL; 1942 ll_ifma = NULL; 1943 if (ifp->if_resolvemulti != NULL) { 1944 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1945 if (error) 1946 goto unlock_out; 1947 } 1948 1949 /* 1950 * Allocate the new address. Don't hook it up yet, as we may also 1951 * need to allocate a link layer multicast address. 1952 */ 1953 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 1954 if (ifma == NULL) { 1955 error = ENOMEM; 1956 goto free_llsa_out; 1957 } 1958 1959 /* 1960 * If a link layer address is found, we'll need to see if it's 1961 * already present in the address list, or allocate is as well. 1962 * When this block finishes, the link layer address will be on the 1963 * list. 1964 */ 1965 if (llsa != NULL) { 1966 ll_ifma = if_findmulti(ifp, llsa); 1967 if (ll_ifma == NULL) { 1968 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 1969 if (ll_ifma == NULL) { 1970 if_freemulti(ifma); 1971 error = ENOMEM; 1972 goto free_llsa_out; 1973 } 1974 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 1975 ifma_link); 1976 } else 1977 ll_ifma->ifma_refcount++; 1978 } 1979 1980 /* 1981 * We now have a new multicast address, ifma, and possibly a new or 1982 * referenced link layer address. Add the primary address to the 1983 * ifnet address list. 1984 */ 1985 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1986 1987 if (retifma != NULL) 1988 *retifma = ifma; 1989 1990 /* 1991 * Must generate the message while holding the lock so that 'ifma' 1992 * pointer is still valid. 1993 * 1994 * XXXRW: How come we don't announce ll_ifma? 1995 */ 1996 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1997 IF_ADDR_UNLOCK(ifp); 1998 1999 /* 2000 * We are certain we have added something, so call down to the 2001 * interface to let them know about it. 2002 */ 2003 if (ifp->if_ioctl != NULL) { 2004 IFF_LOCKGIANT(ifp); 2005 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2006 IFF_UNLOCKGIANT(ifp); 2007 } 2008 2009 if (llsa != NULL) 2010 FREE(llsa, M_IFMADDR); 2011 2012 return (0); 2013 2014 free_llsa_out: 2015 if (llsa != NULL) 2016 FREE(llsa, M_IFMADDR); 2017 2018 unlock_out: 2019 IF_ADDR_UNLOCK(ifp); 2020 return (error); 2021 } 2022 2023 /* 2024 * Remove a reference to a multicast address on this interface. Yell 2025 * if the request does not match an existing membership. 2026 */ 2027 int 2028 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2029 { 2030 struct ifmultiaddr *ifma, *ll_ifma; 2031 2032 IF_ADDR_LOCK(ifp); 2033 ifma = if_findmulti(ifp, sa); 2034 if (ifma == NULL) { 2035 IF_ADDR_UNLOCK(ifp); 2036 return ENOENT; 2037 } 2038 2039 if (ifma->ifma_refcount > 1) { 2040 ifma->ifma_refcount--; 2041 IF_ADDR_UNLOCK(ifp); 2042 return 0; 2043 } 2044 2045 sa = ifma->ifma_lladdr; 2046 if (sa != NULL) 2047 ll_ifma = if_findmulti(ifp, sa); 2048 else 2049 ll_ifma = NULL; 2050 2051 /* 2052 * XXXRW: How come we don't announce ll_ifma? 2053 */ 2054 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2055 2056 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2057 if_freemulti(ifma); 2058 2059 if (ll_ifma != NULL) { 2060 if (ll_ifma->ifma_refcount == 1) { 2061 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifma_link); 2062 if_freemulti(ll_ifma); 2063 } else 2064 ll_ifma->ifma_refcount--; 2065 } 2066 IF_ADDR_UNLOCK(ifp); 2067 2068 /* 2069 * Make sure the interface driver is notified 2070 * in the case of a link layer mcast group being left. 2071 */ 2072 if (ifp->if_ioctl) { 2073 IFF_LOCKGIANT(ifp); 2074 (void) (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2075 IFF_UNLOCKGIANT(ifp); 2076 } 2077 2078 return 0; 2079 } 2080 2081 /* 2082 * Set the link layer address on an interface. 2083 * 2084 * At this time we only support certain types of interfaces, 2085 * and we don't allow the length of the address to change. 2086 */ 2087 int 2088 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2089 { 2090 struct sockaddr_dl *sdl; 2091 struct ifaddr *ifa; 2092 struct ifreq ifr; 2093 2094 ifa = ifp->if_addr; 2095 if (ifa == NULL) 2096 return (EINVAL); 2097 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2098 if (sdl == NULL) 2099 return (EINVAL); 2100 if (len != sdl->sdl_alen) /* don't allow length to change */ 2101 return (EINVAL); 2102 switch (ifp->if_type) { 2103 case IFT_ETHER: 2104 case IFT_FDDI: 2105 case IFT_XETHER: 2106 case IFT_ISO88025: 2107 case IFT_L2VLAN: 2108 case IFT_BRIDGE: 2109 case IFT_ARCNET: 2110 bcopy(lladdr, LLADDR(sdl), len); 2111 break; 2112 default: 2113 return (ENODEV); 2114 } 2115 /* 2116 * If the interface is already up, we need 2117 * to re-init it in order to reprogram its 2118 * address filter. 2119 */ 2120 if ((ifp->if_flags & IFF_UP) != 0) { 2121 if (ifp->if_ioctl) { 2122 IFF_LOCKGIANT(ifp); 2123 ifp->if_flags &= ~IFF_UP; 2124 ifr.ifr_flags = ifp->if_flags & 0xffff; 2125 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2126 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2127 ifp->if_flags |= IFF_UP; 2128 ifr.ifr_flags = ifp->if_flags & 0xffff; 2129 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2130 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2131 IFF_UNLOCKGIANT(ifp); 2132 } 2133 #ifdef INET 2134 /* 2135 * Also send gratuitous ARPs to notify other nodes about 2136 * the address change. 2137 */ 2138 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2139 if (ifa->ifa_addr != NULL && 2140 ifa->ifa_addr->sa_family == AF_INET) 2141 arp_ifinit(ifp, ifa); 2142 } 2143 #endif 2144 } 2145 return (0); 2146 } 2147 2148 /* 2149 * The name argument must be a pointer to storage which will last as 2150 * long as the interface does. For physical devices, the result of 2151 * device_get_name(dev) is a good choice and for pseudo-devices a 2152 * static string works well. 2153 */ 2154 void 2155 if_initname(struct ifnet *ifp, const char *name, int unit) 2156 { 2157 ifp->if_dname = name; 2158 ifp->if_dunit = unit; 2159 if (unit != IF_DUNIT_NONE) 2160 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2161 else 2162 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2163 } 2164 2165 int 2166 if_printf(struct ifnet *ifp, const char * fmt, ...) 2167 { 2168 va_list ap; 2169 int retval; 2170 2171 retval = printf("%s: ", ifp->if_xname); 2172 va_start(ap, fmt); 2173 retval += vprintf(fmt, ap); 2174 va_end(ap); 2175 return (retval); 2176 } 2177 2178 /* 2179 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 2180 * be called without Giant. However, we often can't acquire the Giant lock 2181 * at those points; instead, we run it via a task queue that holds Giant via 2182 * if_start_deferred. 2183 * 2184 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 2185 * outstanding if_start_deferred() tasks that will run after the free. This 2186 * probably means waiting in if_detach(). 2187 */ 2188 void 2189 if_start(struct ifnet *ifp) 2190 { 2191 2192 NET_ASSERT_GIANT(); 2193 2194 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 2195 if (mtx_owned(&Giant)) 2196 (*(ifp)->if_start)(ifp); 2197 else 2198 taskqueue_enqueue(taskqueue_swi_giant, 2199 &ifp->if_starttask); 2200 } else 2201 (*(ifp)->if_start)(ifp); 2202 } 2203 2204 static void 2205 if_start_deferred(void *context, int pending) 2206 { 2207 struct ifnet *ifp; 2208 2209 /* 2210 * This code must be entered with Giant, and should never run if 2211 * we're not running with debug.mpsafenet. 2212 */ 2213 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 2214 GIANT_REQUIRED; 2215 2216 ifp = context; 2217 (ifp->if_start)(ifp); 2218 } 2219 2220 int 2221 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2222 { 2223 int active = 0; 2224 2225 IF_LOCK(ifq); 2226 if (_IF_QFULL(ifq)) { 2227 _IF_DROP(ifq); 2228 IF_UNLOCK(ifq); 2229 m_freem(m); 2230 return (0); 2231 } 2232 if (ifp != NULL) { 2233 ifp->if_obytes += m->m_pkthdr.len + adjust; 2234 if (m->m_flags & (M_BCAST|M_MCAST)) 2235 ifp->if_omcasts++; 2236 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2237 } 2238 _IF_ENQUEUE(ifq, m); 2239 IF_UNLOCK(ifq); 2240 if (ifp != NULL && !active) 2241 if_start(ifp); 2242 return (1); 2243 } 2244 2245 void 2246 if_register_com_alloc(u_char type, 2247 if_com_alloc_t *a, if_com_free_t *f) 2248 { 2249 2250 KASSERT(if_com_alloc[type] == NULL, 2251 ("if_register_com_alloc: %d already registered", type)); 2252 KASSERT(if_com_free[type] == NULL, 2253 ("if_register_com_alloc: %d free already registered", type)); 2254 2255 if_com_alloc[type] = a; 2256 if_com_free[type] = f; 2257 } 2258 2259 void 2260 if_deregister_com_alloc(u_char type) 2261 { 2262 2263 KASSERT(if_com_alloc[type] == NULL, 2264 ("if_deregister_com_alloc: %d not registered", type)); 2265 KASSERT(if_com_free[type] == NULL, 2266 ("if_deregister_com_alloc: %d free not registered", type)); 2267 if_com_alloc[type] = NULL; 2268 if_com_free[type] = NULL; 2269 } 2270