Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if.c
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1 /*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD: releng/6.2/sys/net/if.c 163060 2006-10-06 20:26:06Z andre $ 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_arp.h> 63 #include <net/if_clone.h> 64 #include <net/if_dl.h> 65 #include <net/if_types.h> 66 #include <net/if_var.h> 67 #include <net/radix.h> 68 #include <net/route.h> 69 70 #if defined(INET) || defined(INET6) 71 /*XXX*/ 72 #include <netinet/in.h> 73 #include <netinet/in_var.h> 74 #ifdef INET6 75 #include <netinet6/in6_var.h> 76 #include <netinet6/in6_ifattach.h> 77 #endif 78 #endif 79 #ifdef INET 80 #include <netinet/if_ether.h> 81 #endif 82 #ifdef DEV_CARP 83 #include <netinet/ip_carp.h> 84 #endif 85 86 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 87 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 88 89 /* Log link state change events */ 90 static int log_link_state_change = 1; 91 92 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 93 &log_link_state_change, 0, 94 "log interface link state change events"); 95 96 void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 97 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 98 99 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 100 101 static void if_attachdomain(void *); 102 static void if_attachdomain1(struct ifnet *); 103 static int ifconf(u_long, caddr_t); 104 static void if_grow(void); 105 static void if_init(void *); 106 static void if_check(void *); 107 static void if_qflush(struct ifaltq *); 108 static void if_route(struct ifnet *, int flag, int fam); 109 static int if_setflag(struct ifnet *, int, int, int *, int); 110 static void if_slowtimo(void *); 111 static void if_unroute(struct ifnet *, int flag, int fam); 112 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 113 static int if_rtdel(struct radix_node *, void *); 114 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 115 static void if_start_deferred(void *context, int pending); 116 static void do_link_state_change(void *, int); 117 #ifdef INET6 118 /* 119 * XXX: declare here to avoid to include many inet6 related files.. 120 * should be more generalized? 121 */ 122 extern void nd6_setmtu(struct ifnet *); 123 #endif 124 125 int if_index = 0; 126 struct ifindex_entry *ifindex_table = NULL; 127 int ifqmaxlen = IFQ_MAXLEN; 128 struct ifnethead ifnet; /* depend on static init XXX */ 129 struct mtx ifnet_lock; 130 static if_com_alloc_t *if_com_alloc[256]; 131 static if_com_free_t *if_com_free[256]; 132 133 static int if_indexlim = 8; 134 static struct knlist ifklist; 135 136 static void filt_netdetach(struct knote *kn); 137 static int filt_netdev(struct knote *kn, long hint); 138 139 static struct filterops netdev_filtops = 140 { 1, NULL, filt_netdetach, filt_netdev }; 141 142 /* 143 * System initialization 144 */ 145 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 146 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 147 148 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 149 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 150 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 151 152 static d_open_t netopen; 153 static d_close_t netclose; 154 static d_ioctl_t netioctl; 155 static d_kqfilter_t netkqfilter; 156 157 static struct cdevsw net_cdevsw = { 158 .d_version = D_VERSION, 159 .d_flags = D_NEEDGIANT, 160 .d_open = netopen, 161 .d_close = netclose, 162 .d_ioctl = netioctl, 163 .d_name = "net", 164 .d_kqfilter = netkqfilter, 165 }; 166 167 static int 168 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 169 { 170 return (0); 171 } 172 173 static int 174 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 175 { 176 return (0); 177 } 178 179 static int 180 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 181 { 182 struct ifnet *ifp; 183 int error, idx; 184 185 /* only support interface specific ioctls */ 186 if (IOCGROUP(cmd) != 'i') 187 return (EOPNOTSUPP); 188 idx = minor(dev); 189 if (idx == 0) { 190 /* 191 * special network device, not interface. 192 */ 193 if (cmd == SIOCGIFCONF) 194 return (ifconf(cmd, data)); /* XXX remove cmd */ 195 #ifdef __amd64__ 196 if (cmd == SIOCGIFCONF32) 197 return (ifconf(cmd, data)); /* XXX remove cmd */ 198 #endif 199 return (EOPNOTSUPP); 200 } 201 202 ifp = ifnet_byindex(idx); 203 if (ifp == NULL) 204 return (ENXIO); 205 206 error = ifhwioctl(cmd, ifp, data, td); 207 if (error == ENOIOCTL) 208 error = EOPNOTSUPP; 209 return (error); 210 } 211 212 static int 213 netkqfilter(struct cdev *dev, struct knote *kn) 214 { 215 struct knlist *klist; 216 struct ifnet *ifp; 217 int idx; 218 219 switch (kn->kn_filter) { 220 case EVFILT_NETDEV: 221 kn->kn_fop = &netdev_filtops; 222 break; 223 default: 224 return (EINVAL); 225 } 226 227 idx = minor(dev); 228 if (idx == 0) { 229 klist = &ifklist; 230 } else { 231 ifp = ifnet_byindex(idx); 232 if (ifp == NULL) 233 return (1); 234 klist = &ifp->if_klist; 235 } 236 237 kn->kn_hook = (caddr_t)klist; 238 239 knlist_add(klist, kn, 0); 240 241 return (0); 242 } 243 244 static void 245 filt_netdetach(struct knote *kn) 246 { 247 struct knlist *klist = (struct knlist *)kn->kn_hook; 248 249 knlist_remove(klist, kn, 0); 250 } 251 252 static int 253 filt_netdev(struct knote *kn, long hint) 254 { 255 struct knlist *klist = (struct knlist *)kn->kn_hook; 256 257 /* 258 * Currently NOTE_EXIT is abused to indicate device detach. 259 */ 260 if (hint == NOTE_EXIT) { 261 kn->kn_data = NOTE_LINKINV; 262 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 263 knlist_remove_inevent(klist, kn); 264 return (1); 265 } 266 if (hint != 0) 267 kn->kn_data = hint; /* current status */ 268 if (kn->kn_sfflags & hint) 269 kn->kn_fflags |= hint; 270 return (kn->kn_fflags != 0); 271 } 272 273 /* 274 * Network interface utility routines. 275 * 276 * Routines with ifa_ifwith* names take sockaddr *'s as 277 * parameters. 278 */ 279 /* ARGSUSED*/ 280 static void 281 if_init(void *dummy __unused) 282 { 283 284 IFNET_LOCK_INIT(); 285 TAILQ_INIT(&ifnet); 286 knlist_init(&ifklist, NULL, NULL, NULL, NULL); 287 if_grow(); /* create initial table */ 288 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 289 UID_ROOT, GID_WHEEL, 0600, "network"); 290 if_clone_init(); 291 } 292 293 static void 294 if_grow(void) 295 { 296 u_int n; 297 struct ifindex_entry *e; 298 299 if_indexlim <<= 1; 300 n = if_indexlim * sizeof(*e); 301 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 302 if (ifindex_table != NULL) { 303 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 304 free((caddr_t)ifindex_table, M_IFNET); 305 } 306 ifindex_table = e; 307 } 308 309 /* ARGSUSED*/ 310 static void 311 if_check(void *dummy __unused) 312 { 313 struct ifnet *ifp; 314 int s; 315 316 s = splimp(); 317 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 318 TAILQ_FOREACH(ifp, &ifnet, if_link) { 319 if (ifp->if_snd.ifq_maxlen == 0) { 320 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 321 ifp->if_snd.ifq_maxlen = ifqmaxlen; 322 } 323 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 324 if_printf(ifp, 325 "XXX: driver didn't initialize queue mtx\n"); 326 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 327 MTX_NETWORK_LOCK, MTX_DEF); 328 } 329 } 330 IFNET_RUNLOCK(); 331 splx(s); 332 if_slowtimo(0); 333 } 334 335 /* 336 * Allocate a struct ifnet and in index for an interface. 337 */ 338 struct ifnet* 339 if_alloc(u_char type) 340 { 341 struct ifnet *ifp; 342 343 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 344 345 /* 346 * Try to find an empty slot below if_index. If we fail, take 347 * the next slot. 348 * 349 * XXX: should be locked! 350 */ 351 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) { 352 if (ifnet_byindex(ifp->if_index) == NULL) 353 break; 354 } 355 /* Catch if_index overflow. */ 356 if (ifp->if_index < 1) { 357 free(ifp, M_IFNET); 358 return (NULL); 359 } 360 if (ifp->if_index > if_index) 361 if_index = ifp->if_index; 362 if (if_index >= if_indexlim) 363 if_grow(); 364 ifnet_byindex(ifp->if_index) = ifp; 365 366 ifp->if_type = type; 367 368 if (if_com_alloc[type] != NULL) { 369 ifp->if_l2com = if_com_alloc[type](type, ifp); 370 if (ifp->if_l2com == NULL) { 371 free(ifp, M_IFNET); 372 return (NULL); 373 } 374 } 375 IF_ADDR_LOCK_INIT(ifp); 376 377 return (ifp); 378 } 379 380 void 381 if_free(struct ifnet *ifp) 382 { 383 384 /* Do not add code to this function! Add it to if_free_type(). */ 385 if_free_type(ifp, ifp->if_type); 386 } 387 388 void 389 if_free_type(struct ifnet *ifp, u_char type) 390 { 391 392 if (ifp != ifnet_byindex(ifp->if_index)) { 393 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 394 __func__); 395 return; 396 } 397 398 IF_ADDR_LOCK_DESTROY(ifp); 399 400 ifnet_byindex(ifp->if_index) = NULL; 401 402 /* XXX: should be locked with if_findindex() */ 403 while (if_index > 0 && ifnet_byindex(if_index) == NULL) 404 if_index--; 405 406 if (if_com_free[type] != NULL) 407 if_com_free[type](ifp->if_l2com, type); 408 409 free(ifp, M_IFNET); 410 }; 411 412 /* 413 * Attach an interface to the 414 * list of "active" interfaces. 415 */ 416 void 417 if_attach(struct ifnet *ifp) 418 { 419 unsigned socksize, ifasize; 420 int namelen, masklen; 421 struct sockaddr_dl *sdl; 422 struct ifaddr *ifa; 423 424 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 425 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 426 ifp->if_xname); 427 428 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 429 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 430 IF_AFDATA_LOCK_INIT(ifp); 431 ifp->if_afdata_initialized = 0; 432 /* 433 * XXX - 434 * The old code would work if the interface passed a pre-existing 435 * chain of ifaddrs to this code. We don't trust our callers to 436 * properly initialize the tailq, however, so we no longer allow 437 * this unlikely case. 438 */ 439 TAILQ_INIT(&ifp->if_addrhead); 440 TAILQ_INIT(&ifp->if_prefixhead); 441 TAILQ_INIT(&ifp->if_multiaddrs); 442 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 443 getmicrotime(&ifp->if_lastchange); 444 ifp->if_data.ifi_epoch = time_uptime; 445 ifp->if_data.ifi_datalen = sizeof(struct if_data); 446 447 #ifdef MAC 448 mac_init_ifnet(ifp); 449 mac_create_ifnet(ifp); 450 #endif 451 452 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 453 unit2minor(ifp->if_index), 454 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 455 net_cdevsw.d_name, ifp->if_xname); 456 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 457 net_cdevsw.d_name, ifp->if_index); 458 459 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 460 461 /* 462 * create a Link Level name for this device 463 */ 464 namelen = strlen(ifp->if_xname); 465 /* 466 * Always save enough space for any possiable name so we can do 467 * a rename in place later. 468 */ 469 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 470 socksize = masklen + ifp->if_addrlen; 471 if (socksize < sizeof(*sdl)) 472 socksize = sizeof(*sdl); 473 socksize = roundup2(socksize, sizeof(long)); 474 ifasize = sizeof(*ifa) + 2 * socksize; 475 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 476 IFA_LOCK_INIT(ifa); 477 sdl = (struct sockaddr_dl *)(ifa + 1); 478 sdl->sdl_len = socksize; 479 sdl->sdl_family = AF_LINK; 480 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 481 sdl->sdl_nlen = namelen; 482 sdl->sdl_index = ifp->if_index; 483 sdl->sdl_type = ifp->if_type; 484 ifaddr_byindex(ifp->if_index) = ifa; 485 ifa->ifa_ifp = ifp; 486 ifa->ifa_rtrequest = link_rtrequest; 487 ifa->ifa_addr = (struct sockaddr *)sdl; 488 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 489 ifa->ifa_netmask = (struct sockaddr *)sdl; 490 sdl->sdl_len = masklen; 491 while (namelen != 0) 492 sdl->sdl_data[--namelen] = 0xff; 493 ifa->ifa_refcnt = 1; 494 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 495 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 496 ifp->if_snd.altq_type = 0; 497 ifp->if_snd.altq_disc = NULL; 498 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 499 ifp->if_snd.altq_tbr = NULL; 500 ifp->if_snd.altq_ifp = ifp; 501 502 IFNET_WLOCK(); 503 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 504 IFNET_WUNLOCK(); 505 506 if (domain_init_status >= 2) 507 if_attachdomain1(ifp); 508 509 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 510 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 511 512 /* Announce the interface. */ 513 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 514 } 515 516 static void 517 if_attachdomain(void *dummy) 518 { 519 struct ifnet *ifp; 520 int s; 521 522 s = splnet(); 523 TAILQ_FOREACH(ifp, &ifnet, if_link) 524 if_attachdomain1(ifp); 525 splx(s); 526 } 527 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 528 if_attachdomain, NULL); 529 530 static void 531 if_attachdomain1(struct ifnet *ifp) 532 { 533 struct domain *dp; 534 int s; 535 536 s = splnet(); 537 538 /* 539 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 540 * cannot lock ifp->if_afdata initialization, entirely. 541 */ 542 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 543 splx(s); 544 return; 545 } 546 if (ifp->if_afdata_initialized >= domain_init_status) { 547 IF_AFDATA_UNLOCK(ifp); 548 splx(s); 549 printf("if_attachdomain called more than once on %s\n", 550 ifp->if_xname); 551 return; 552 } 553 ifp->if_afdata_initialized = domain_init_status; 554 IF_AFDATA_UNLOCK(ifp); 555 556 /* address family dependent data region */ 557 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 558 for (dp = domains; dp; dp = dp->dom_next) { 559 if (dp->dom_ifattach) 560 ifp->if_afdata[dp->dom_family] = 561 (*dp->dom_ifattach)(ifp); 562 } 563 564 splx(s); 565 } 566 567 /* 568 * Remove any network addresses from an interface. 569 */ 570 571 void 572 if_purgeaddrs(struct ifnet *ifp) 573 { 574 struct ifaddr *ifa, *next; 575 576 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 577 578 if (ifa->ifa_addr->sa_family == AF_LINK) 579 continue; 580 #ifdef INET 581 /* XXX: Ugly!! ad hoc just for INET */ 582 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 583 struct ifaliasreq ifr; 584 585 bzero(&ifr, sizeof(ifr)); 586 ifr.ifra_addr = *ifa->ifa_addr; 587 if (ifa->ifa_dstaddr) 588 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 589 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 590 NULL) == 0) 591 continue; 592 } 593 #endif /* INET */ 594 #ifdef INET6 595 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 596 in6_purgeaddr(ifa); 597 /* ifp_addrhead is already updated */ 598 continue; 599 } 600 #endif /* INET6 */ 601 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 602 IFAFREE(ifa); 603 } 604 } 605 606 /* 607 * Detach an interface, removing it from the 608 * list of "active" interfaces and freeing the struct ifnet. 609 * 610 * XXXRW: There are some significant questions about event ordering, and 611 * how to prevent things from starting to use the interface during detach. 612 */ 613 void 614 if_detach(struct ifnet *ifp) 615 { 616 struct ifaddr *ifa; 617 struct radix_node_head *rnh; 618 int s; 619 int i; 620 struct domain *dp; 621 struct ifnet *iter; 622 int found = 0; 623 624 IFNET_WLOCK(); 625 TAILQ_FOREACH(iter, &ifnet, if_link) 626 if (iter == ifp) { 627 TAILQ_REMOVE(&ifnet, ifp, if_link); 628 found = 1; 629 break; 630 } 631 IFNET_WUNLOCK(); 632 if (!found) 633 return; 634 635 /* 636 * Remove/wait for pending events. 637 */ 638 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 639 640 /* 641 * Remove routes and flush queues. 642 */ 643 s = splnet(); 644 if_down(ifp); 645 #ifdef ALTQ 646 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 647 altq_disable(&ifp->if_snd); 648 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 649 altq_detach(&ifp->if_snd); 650 #endif 651 652 if_purgeaddrs(ifp); 653 654 #ifdef INET 655 in_ifdetach(ifp); 656 #endif 657 658 #ifdef INET6 659 /* 660 * Remove all IPv6 kernel structs related to ifp. This should be done 661 * before removing routing entries below, since IPv6 interface direct 662 * routes are expected to be removed by the IPv6-specific kernel API. 663 * Otherwise, the kernel will detect some inconsistency and bark it. 664 */ 665 in6_ifdetach(ifp); 666 #endif 667 /* 668 * Remove address from ifindex_table[] and maybe decrement if_index. 669 * Clean up all addresses. 670 */ 671 ifaddr_byindex(ifp->if_index) = NULL; 672 destroy_dev(ifdev_byindex(ifp->if_index)); 673 ifdev_byindex(ifp->if_index) = NULL; 674 675 /* We can now free link ifaddr. */ 676 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 677 ifa = TAILQ_FIRST(&ifp->if_addrhead); 678 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 679 IFAFREE(ifa); 680 } 681 682 /* 683 * Delete all remaining routes using this interface 684 * Unfortuneatly the only way to do this is to slog through 685 * the entire routing table looking for routes which point 686 * to this interface...oh well... 687 */ 688 for (i = 1; i <= AF_MAX; i++) { 689 if ((rnh = rt_tables[i]) == NULL) 690 continue; 691 RADIX_NODE_HEAD_LOCK(rnh); 692 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 693 RADIX_NODE_HEAD_UNLOCK(rnh); 694 } 695 696 /* Announce that the interface is gone. */ 697 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 698 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 699 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 700 701 IF_AFDATA_LOCK(ifp); 702 for (dp = domains; dp; dp = dp->dom_next) { 703 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 704 (*dp->dom_ifdetach)(ifp, 705 ifp->if_afdata[dp->dom_family]); 706 } 707 IF_AFDATA_UNLOCK(ifp); 708 709 #ifdef MAC 710 mac_destroy_ifnet(ifp); 711 #endif /* MAC */ 712 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 713 knlist_clear(&ifp->if_klist, 0); 714 knlist_destroy(&ifp->if_klist); 715 mtx_destroy(&ifp->if_snd.ifq_mtx); 716 IF_AFDATA_DESTROY(ifp); 717 splx(s); 718 } 719 720 /* 721 * Delete Routes for a Network Interface 722 * 723 * Called for each routing entry via the rnh->rnh_walktree() call above 724 * to delete all route entries referencing a detaching network interface. 725 * 726 * Arguments: 727 * rn pointer to node in the routing table 728 * arg argument passed to rnh->rnh_walktree() - detaching interface 729 * 730 * Returns: 731 * 0 successful 732 * errno failed - reason indicated 733 * 734 */ 735 static int 736 if_rtdel(struct radix_node *rn, void *arg) 737 { 738 struct rtentry *rt = (struct rtentry *)rn; 739 struct ifnet *ifp = arg; 740 int err; 741 742 if (rt->rt_ifp == ifp) { 743 744 /* 745 * Protect (sorta) against walktree recursion problems 746 * with cloned routes 747 */ 748 if ((rt->rt_flags & RTF_UP) == 0) 749 return (0); 750 751 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 752 rt_mask(rt), rt->rt_flags, 753 (struct rtentry **) NULL); 754 if (err) { 755 log(LOG_WARNING, "if_rtdel: error %d\n", err); 756 } 757 } 758 759 return (0); 760 } 761 762 #define sa_equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 763 764 /* 765 * Locate an interface based on a complete address. 766 */ 767 /*ARGSUSED*/ 768 struct ifaddr * 769 ifa_ifwithaddr(struct sockaddr *addr) 770 { 771 struct ifnet *ifp; 772 struct ifaddr *ifa; 773 774 IFNET_RLOCK(); 775 TAILQ_FOREACH(ifp, &ifnet, if_link) 776 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 777 if (ifa->ifa_addr->sa_family != addr->sa_family) 778 continue; 779 if (sa_equal(addr, ifa->ifa_addr)) 780 goto done; 781 /* IP6 doesn't have broadcast */ 782 if ((ifp->if_flags & IFF_BROADCAST) && 783 ifa->ifa_broadaddr && 784 ifa->ifa_broadaddr->sa_len != 0 && 785 sa_equal(ifa->ifa_broadaddr, addr)) 786 goto done; 787 } 788 ifa = NULL; 789 done: 790 IFNET_RUNLOCK(); 791 return (ifa); 792 } 793 794 /* 795 * Locate an interface based on the broadcast address. 796 */ 797 /* ARGSUSED */ 798 struct ifaddr * 799 ifa_ifwithbroadaddr(struct sockaddr *addr) 800 { 801 struct ifnet *ifp; 802 struct ifaddr *ifa; 803 804 IFNET_RLOCK(); 805 TAILQ_FOREACH(ifp, &ifnet, if_link) 806 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 807 if (ifa->ifa_addr->sa_family != addr->sa_family) 808 continue; 809 if ((ifp->if_flags & IFF_BROADCAST) && 810 ifa->ifa_broadaddr && 811 ifa->ifa_broadaddr->sa_len != 0 && 812 sa_equal(ifa->ifa_broadaddr, addr)) 813 goto done; 814 } 815 ifa = NULL; 816 done: 817 IFNET_RUNLOCK(); 818 return (ifa); 819 } 820 821 /* 822 * Locate the point to point interface with a given destination address. 823 */ 824 /*ARGSUSED*/ 825 struct ifaddr * 826 ifa_ifwithdstaddr(struct sockaddr *addr) 827 { 828 struct ifnet *ifp; 829 struct ifaddr *ifa; 830 831 IFNET_RLOCK(); 832 TAILQ_FOREACH(ifp, &ifnet, if_link) { 833 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 834 continue; 835 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 836 if (ifa->ifa_addr->sa_family != addr->sa_family) 837 continue; 838 if (ifa->ifa_dstaddr && 839 sa_equal(addr, ifa->ifa_dstaddr)) 840 goto done; 841 } 842 } 843 ifa = NULL; 844 done: 845 IFNET_RUNLOCK(); 846 return (ifa); 847 } 848 849 /* 850 * Find an interface on a specific network. If many, choice 851 * is most specific found. 852 */ 853 struct ifaddr * 854 ifa_ifwithnet(struct sockaddr *addr) 855 { 856 struct ifnet *ifp; 857 struct ifaddr *ifa; 858 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 859 u_int af = addr->sa_family; 860 char *addr_data = addr->sa_data, *cplim; 861 862 /* 863 * AF_LINK addresses can be looked up directly by their index number, 864 * so do that if we can. 865 */ 866 if (af == AF_LINK) { 867 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 868 if (sdl->sdl_index && sdl->sdl_index <= if_index) 869 return (ifaddr_byindex(sdl->sdl_index)); 870 } 871 872 /* 873 * Scan though each interface, looking for ones that have 874 * addresses in this address family. 875 */ 876 IFNET_RLOCK(); 877 TAILQ_FOREACH(ifp, &ifnet, if_link) { 878 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 879 char *cp, *cp2, *cp3; 880 881 if (ifa->ifa_addr->sa_family != af) 882 next: continue; 883 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 884 /* 885 * This is a bit broken as it doesn't 886 * take into account that the remote end may 887 * be a single node in the network we are 888 * looking for. 889 * The trouble is that we don't know the 890 * netmask for the remote end. 891 */ 892 if (ifa->ifa_dstaddr != 0 && 893 sa_equal(addr, ifa->ifa_dstaddr)) 894 goto done; 895 } else { 896 /* 897 * if we have a special address handler, 898 * then use it instead of the generic one. 899 */ 900 if (ifa->ifa_claim_addr) { 901 if ((*ifa->ifa_claim_addr)(ifa, addr)) 902 goto done; 903 continue; 904 } 905 906 /* 907 * Scan all the bits in the ifa's address. 908 * If a bit dissagrees with what we are 909 * looking for, mask it with the netmask 910 * to see if it really matters. 911 * (A byte at a time) 912 */ 913 if (ifa->ifa_netmask == 0) 914 continue; 915 cp = addr_data; 916 cp2 = ifa->ifa_addr->sa_data; 917 cp3 = ifa->ifa_netmask->sa_data; 918 cplim = ifa->ifa_netmask->sa_len 919 + (char *)ifa->ifa_netmask; 920 while (cp3 < cplim) 921 if ((*cp++ ^ *cp2++) & *cp3++) 922 goto next; /* next address! */ 923 /* 924 * If the netmask of what we just found 925 * is more specific than what we had before 926 * (if we had one) then remember the new one 927 * before continuing to search 928 * for an even better one. 929 */ 930 if (ifa_maybe == 0 || 931 rn_refines((caddr_t)ifa->ifa_netmask, 932 (caddr_t)ifa_maybe->ifa_netmask)) 933 ifa_maybe = ifa; 934 } 935 } 936 } 937 ifa = ifa_maybe; 938 done: 939 IFNET_RUNLOCK(); 940 return (ifa); 941 } 942 943 /* 944 * Find an interface address specific to an interface best matching 945 * a given address. 946 */ 947 struct ifaddr * 948 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 949 { 950 struct ifaddr *ifa; 951 char *cp, *cp2, *cp3; 952 char *cplim; 953 struct ifaddr *ifa_maybe = 0; 954 u_int af = addr->sa_family; 955 956 if (af >= AF_MAX) 957 return (0); 958 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 959 if (ifa->ifa_addr->sa_family != af) 960 continue; 961 if (ifa_maybe == 0) 962 ifa_maybe = ifa; 963 if (ifa->ifa_netmask == 0) { 964 if (sa_equal(addr, ifa->ifa_addr) || 965 (ifa->ifa_dstaddr && 966 sa_equal(addr, ifa->ifa_dstaddr))) 967 goto done; 968 continue; 969 } 970 if (ifp->if_flags & IFF_POINTOPOINT) { 971 if (sa_equal(addr, ifa->ifa_dstaddr)) 972 goto done; 973 } else { 974 cp = addr->sa_data; 975 cp2 = ifa->ifa_addr->sa_data; 976 cp3 = ifa->ifa_netmask->sa_data; 977 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 978 for (; cp3 < cplim; cp3++) 979 if ((*cp++ ^ *cp2++) & *cp3) 980 break; 981 if (cp3 == cplim) 982 goto done; 983 } 984 } 985 ifa = ifa_maybe; 986 done: 987 return (ifa); 988 } 989 990 #include <net/route.h> 991 992 /* 993 * Default action when installing a route with a Link Level gateway. 994 * Lookup an appropriate real ifa to point to. 995 * This should be moved to /sys/net/link.c eventually. 996 */ 997 static void 998 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 999 { 1000 struct ifaddr *ifa, *oifa; 1001 struct sockaddr *dst; 1002 struct ifnet *ifp; 1003 1004 RT_LOCK_ASSERT(rt); 1005 1006 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1007 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1008 return; 1009 ifa = ifaof_ifpforaddr(dst, ifp); 1010 if (ifa) { 1011 IFAREF(ifa); /* XXX */ 1012 oifa = rt->rt_ifa; 1013 rt->rt_ifa = ifa; 1014 IFAFREE(oifa); 1015 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1016 ifa->ifa_rtrequest(cmd, rt, info); 1017 } 1018 } 1019 1020 /* 1021 * Mark an interface down and notify protocols of 1022 * the transition. 1023 * NOTE: must be called at splnet or eqivalent. 1024 */ 1025 static void 1026 if_unroute(struct ifnet *ifp, int flag, int fam) 1027 { 1028 struct ifaddr *ifa; 1029 1030 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1031 1032 ifp->if_flags &= ~flag; 1033 getmicrotime(&ifp->if_lastchange); 1034 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1035 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1036 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1037 if_qflush(&ifp->if_snd); 1038 #ifdef DEV_CARP 1039 if (ifp->if_carp) 1040 carp_carpdev_state(ifp->if_carp); 1041 #endif 1042 rt_ifmsg(ifp); 1043 } 1044 1045 /* 1046 * Mark an interface up and notify protocols of 1047 * the transition. 1048 * NOTE: must be called at splnet or eqivalent. 1049 */ 1050 static void 1051 if_route(struct ifnet *ifp, int flag, int fam) 1052 { 1053 struct ifaddr *ifa; 1054 1055 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1056 1057 ifp->if_flags |= flag; 1058 getmicrotime(&ifp->if_lastchange); 1059 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1060 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1061 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1062 #ifdef DEV_CARP 1063 if (ifp->if_carp) 1064 carp_carpdev_state(ifp->if_carp); 1065 #endif 1066 rt_ifmsg(ifp); 1067 #ifdef INET6 1068 in6_if_up(ifp); 1069 #endif 1070 } 1071 1072 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1073 1074 /* 1075 * Handle a change in the interface link state. To avoid LORs 1076 * between driver lock and upper layer locks, as well as possible 1077 * recursions, we post event to taskqueue, and all job 1078 * is done in static do_link_state_change(). 1079 */ 1080 void 1081 if_link_state_change(struct ifnet *ifp, int link_state) 1082 { 1083 /* Return if state hasn't changed. */ 1084 if (ifp->if_link_state == link_state) 1085 return; 1086 1087 ifp->if_link_state = link_state; 1088 1089 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1090 } 1091 1092 static void 1093 do_link_state_change(void *arg, int pending) 1094 { 1095 struct ifnet *ifp = (struct ifnet *)arg; 1096 int link_state = ifp->if_link_state; 1097 int link; 1098 1099 /* Notify that the link state has changed. */ 1100 rt_ifmsg(ifp); 1101 if (link_state == LINK_STATE_UP) 1102 link = NOTE_LINKUP; 1103 else if (link_state == LINK_STATE_DOWN) 1104 link = NOTE_LINKDOWN; 1105 else 1106 link = NOTE_LINKINV; 1107 KNOTE_UNLOCKED(&ifp->if_klist, link); 1108 if (ifp->if_nvlans != 0) 1109 (*vlan_link_state_p)(ifp, link); 1110 1111 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1112 IFP2AC(ifp)->ac_netgraph != NULL) 1113 (*ng_ether_link_state_p)(ifp, link_state); 1114 #ifdef DEV_CARP 1115 if (ifp->if_carp) 1116 carp_carpdev_state(ifp->if_carp); 1117 #endif 1118 if (ifp->if_bridge) { 1119 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1120 (*bstp_linkstate_p)(ifp, link_state); 1121 } 1122 1123 devctl_notify("IFNET", ifp->if_xname, 1124 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1125 if (pending > 1) 1126 if_printf(ifp, "%d link states coalesced\n", pending); 1127 if (log_link_state_change) 1128 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1129 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1130 } 1131 1132 /* 1133 * Mark an interface down and notify protocols of 1134 * the transition. 1135 * NOTE: must be called at splnet or eqivalent. 1136 */ 1137 void 1138 if_down(struct ifnet *ifp) 1139 { 1140 1141 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1142 } 1143 1144 /* 1145 * Mark an interface up and notify protocols of 1146 * the transition. 1147 * NOTE: must be called at splnet or eqivalent. 1148 */ 1149 void 1150 if_up(struct ifnet *ifp) 1151 { 1152 1153 if_route(ifp, IFF_UP, AF_UNSPEC); 1154 } 1155 1156 /* 1157 * Flush an interface queue. 1158 */ 1159 static void 1160 if_qflush(struct ifaltq *ifq) 1161 { 1162 struct mbuf *m, *n; 1163 1164 IFQ_LOCK(ifq); 1165 #ifdef ALTQ 1166 if (ALTQ_IS_ENABLED(ifq)) 1167 ALTQ_PURGE(ifq); 1168 #endif 1169 n = ifq->ifq_head; 1170 while ((m = n) != 0) { 1171 n = m->m_act; 1172 m_freem(m); 1173 } 1174 ifq->ifq_head = 0; 1175 ifq->ifq_tail = 0; 1176 ifq->ifq_len = 0; 1177 IFQ_UNLOCK(ifq); 1178 } 1179 1180 /* 1181 * Handle interface watchdog timer routines. Called 1182 * from softclock, we decrement timers (if set) and 1183 * call the appropriate interface routine on expiration. 1184 * 1185 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1186 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1187 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1188 */ 1189 static void 1190 if_slowtimo(void *arg) 1191 { 1192 struct ifnet *ifp; 1193 int s = splimp(); 1194 1195 IFNET_RLOCK(); 1196 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1197 if (ifp->if_timer == 0 || --ifp->if_timer) 1198 continue; 1199 if (ifp->if_watchdog) 1200 (*ifp->if_watchdog)(ifp); 1201 } 1202 IFNET_RUNLOCK(); 1203 splx(s); 1204 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1205 } 1206 1207 /* 1208 * Map interface name to 1209 * interface structure pointer. 1210 */ 1211 struct ifnet * 1212 ifunit(const char *name) 1213 { 1214 struct ifnet *ifp; 1215 1216 IFNET_RLOCK(); 1217 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1218 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1219 break; 1220 } 1221 IFNET_RUNLOCK(); 1222 return (ifp); 1223 } 1224 1225 /* 1226 * Hardware specific interface ioctls. 1227 */ 1228 static int 1229 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1230 { 1231 struct ifreq *ifr; 1232 struct ifstat *ifs; 1233 int error = 0; 1234 int new_flags, temp_flags; 1235 size_t namelen, onamelen; 1236 char new_name[IFNAMSIZ]; 1237 struct ifaddr *ifa; 1238 struct sockaddr_dl *sdl; 1239 1240 ifr = (struct ifreq *)data; 1241 switch (cmd) { 1242 case SIOCGIFINDEX: 1243 ifr->ifr_index = ifp->if_index; 1244 break; 1245 1246 case SIOCGIFFLAGS: 1247 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1248 ifr->ifr_flags = temp_flags & 0xffff; 1249 ifr->ifr_flagshigh = temp_flags >> 16; 1250 break; 1251 1252 case SIOCGIFCAP: 1253 ifr->ifr_reqcap = ifp->if_capabilities; 1254 ifr->ifr_curcap = ifp->if_capenable; 1255 break; 1256 1257 #ifdef MAC 1258 case SIOCGIFMAC: 1259 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1260 break; 1261 #endif 1262 1263 case SIOCGIFMETRIC: 1264 ifr->ifr_metric = ifp->if_metric; 1265 break; 1266 1267 case SIOCGIFMTU: 1268 ifr->ifr_mtu = ifp->if_mtu; 1269 break; 1270 1271 case SIOCGIFPHYS: 1272 ifr->ifr_phys = ifp->if_physical; 1273 break; 1274 1275 case SIOCSIFFLAGS: 1276 error = suser(td); 1277 if (error) 1278 return (error); 1279 /* 1280 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1281 * check, so we don't need special handling here yet. 1282 */ 1283 new_flags = (ifr->ifr_flags & 0xffff) | 1284 (ifr->ifr_flagshigh << 16); 1285 if (ifp->if_flags & IFF_SMART) { 1286 /* Smart drivers twiddle their own routes */ 1287 } else if (ifp->if_flags & IFF_UP && 1288 (new_flags & IFF_UP) == 0) { 1289 int s = splimp(); 1290 if_down(ifp); 1291 splx(s); 1292 } else if (new_flags & IFF_UP && 1293 (ifp->if_flags & IFF_UP) == 0) { 1294 int s = splimp(); 1295 if_up(ifp); 1296 splx(s); 1297 } 1298 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1299 (new_flags &~ IFF_CANTCHANGE); 1300 if (new_flags & IFF_PPROMISC) { 1301 /* Permanently promiscuous mode requested */ 1302 ifp->if_flags |= IFF_PROMISC; 1303 } else if (ifp->if_pcount == 0) { 1304 ifp->if_flags &= ~IFF_PROMISC; 1305 } 1306 if (ifp->if_ioctl != NULL) { 1307 IFF_LOCKGIANT(ifp); 1308 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1309 IFF_UNLOCKGIANT(ifp); 1310 } 1311 getmicrotime(&ifp->if_lastchange); 1312 break; 1313 1314 case SIOCSIFCAP: 1315 error = suser(td); 1316 if (error) 1317 return (error); 1318 if (ifp->if_ioctl == NULL) 1319 return (EOPNOTSUPP); 1320 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1321 return (EINVAL); 1322 IFF_LOCKGIANT(ifp); 1323 error = (*ifp->if_ioctl)(ifp, cmd, data); 1324 IFF_UNLOCKGIANT(ifp); 1325 if (error == 0) 1326 getmicrotime(&ifp->if_lastchange); 1327 break; 1328 1329 #ifdef MAC 1330 case SIOCSIFMAC: 1331 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1332 break; 1333 #endif 1334 1335 case SIOCSIFNAME: 1336 error = suser(td); 1337 if (error != 0) 1338 return (error); 1339 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1340 if (error != 0) 1341 return (error); 1342 if (new_name[0] == '\0') 1343 return (EINVAL); 1344 if (ifunit(new_name) != NULL) 1345 return (EEXIST); 1346 1347 /* Announce the departure of the interface. */ 1348 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1349 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1350 1351 log(LOG_INFO, "%s: changing name to '%s'\n", 1352 ifp->if_xname, new_name); 1353 1354 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1355 ifa = ifaddr_byindex(ifp->if_index); 1356 IFA_LOCK(ifa); 1357 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1358 namelen = strlen(new_name); 1359 onamelen = sdl->sdl_nlen; 1360 /* 1361 * Move the address if needed. This is safe because we 1362 * allocate space for a name of length IFNAMSIZ when we 1363 * create this in if_attach(). 1364 */ 1365 if (namelen != onamelen) { 1366 bcopy(sdl->sdl_data + onamelen, 1367 sdl->sdl_data + namelen, sdl->sdl_alen); 1368 } 1369 bcopy(new_name, sdl->sdl_data, namelen); 1370 sdl->sdl_nlen = namelen; 1371 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1372 bzero(sdl->sdl_data, onamelen); 1373 while (namelen != 0) 1374 sdl->sdl_data[--namelen] = 0xff; 1375 IFA_UNLOCK(ifa); 1376 1377 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1378 /* Announce the return of the interface. */ 1379 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1380 break; 1381 1382 case SIOCSIFMETRIC: 1383 error = suser(td); 1384 if (error) 1385 return (error); 1386 ifp->if_metric = ifr->ifr_metric; 1387 getmicrotime(&ifp->if_lastchange); 1388 break; 1389 1390 case SIOCSIFPHYS: 1391 error = suser(td); 1392 if (error) 1393 return (error); 1394 if (ifp->if_ioctl == NULL) 1395 return (EOPNOTSUPP); 1396 IFF_LOCKGIANT(ifp); 1397 error = (*ifp->if_ioctl)(ifp, cmd, data); 1398 IFF_UNLOCKGIANT(ifp); 1399 if (error == 0) 1400 getmicrotime(&ifp->if_lastchange); 1401 break; 1402 1403 case SIOCSIFMTU: 1404 { 1405 u_long oldmtu = ifp->if_mtu; 1406 1407 error = suser(td); 1408 if (error) 1409 return (error); 1410 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1411 return (EINVAL); 1412 if (ifp->if_ioctl == NULL) 1413 return (EOPNOTSUPP); 1414 IFF_LOCKGIANT(ifp); 1415 error = (*ifp->if_ioctl)(ifp, cmd, data); 1416 IFF_UNLOCKGIANT(ifp); 1417 if (error == 0) { 1418 getmicrotime(&ifp->if_lastchange); 1419 rt_ifmsg(ifp); 1420 } 1421 /* 1422 * If the link MTU changed, do network layer specific procedure. 1423 */ 1424 if (ifp->if_mtu != oldmtu) { 1425 #ifdef INET6 1426 nd6_setmtu(ifp); 1427 #endif 1428 } 1429 break; 1430 } 1431 1432 case SIOCADDMULTI: 1433 case SIOCDELMULTI: 1434 error = suser(td); 1435 if (error) 1436 return (error); 1437 1438 /* Don't allow group membership on non-multicast interfaces. */ 1439 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1440 return (EOPNOTSUPP); 1441 1442 /* Don't let users screw up protocols' entries. */ 1443 if (ifr->ifr_addr.sa_family != AF_LINK) 1444 return (EINVAL); 1445 1446 if (cmd == SIOCADDMULTI) { 1447 struct ifmultiaddr *ifma; 1448 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1449 } else { 1450 error = if_delmulti(ifp, &ifr->ifr_addr); 1451 } 1452 if (error == 0) 1453 getmicrotime(&ifp->if_lastchange); 1454 break; 1455 1456 case SIOCSIFPHYADDR: 1457 case SIOCDIFPHYADDR: 1458 #ifdef INET6 1459 case SIOCSIFPHYADDR_IN6: 1460 #endif 1461 case SIOCSLIFPHYADDR: 1462 case SIOCSIFMEDIA: 1463 case SIOCSIFGENERIC: 1464 error = suser(td); 1465 if (error) 1466 return (error); 1467 if (ifp->if_ioctl == NULL) 1468 return (EOPNOTSUPP); 1469 IFF_LOCKGIANT(ifp); 1470 error = (*ifp->if_ioctl)(ifp, cmd, data); 1471 IFF_UNLOCKGIANT(ifp); 1472 if (error == 0) 1473 getmicrotime(&ifp->if_lastchange); 1474 break; 1475 1476 case SIOCGIFSTATUS: 1477 ifs = (struct ifstat *)data; 1478 ifs->ascii[0] = '\0'; 1479 1480 case SIOCGIFPSRCADDR: 1481 case SIOCGIFPDSTADDR: 1482 case SIOCGLIFPHYADDR: 1483 case SIOCGIFMEDIA: 1484 case SIOCGIFGENERIC: 1485 if (ifp->if_ioctl == NULL) 1486 return (EOPNOTSUPP); 1487 IFF_LOCKGIANT(ifp); 1488 error = (*ifp->if_ioctl)(ifp, cmd, data); 1489 IFF_UNLOCKGIANT(ifp); 1490 break; 1491 1492 case SIOCSIFLLADDR: 1493 error = suser(td); 1494 if (error) 1495 return (error); 1496 error = if_setlladdr(ifp, 1497 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1498 break; 1499 1500 default: 1501 error = ENOIOCTL; 1502 break; 1503 } 1504 return (error); 1505 } 1506 1507 /* 1508 * Interface ioctls. 1509 */ 1510 int 1511 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1512 { 1513 struct ifnet *ifp; 1514 struct ifreq *ifr; 1515 int error; 1516 int oif_flags; 1517 1518 switch (cmd) { 1519 case SIOCGIFCONF: 1520 case OSIOCGIFCONF: 1521 #ifdef __amd64__ 1522 case SIOCGIFCONF32: 1523 #endif 1524 return (ifconf(cmd, data)); 1525 } 1526 ifr = (struct ifreq *)data; 1527 1528 switch (cmd) { 1529 case SIOCIFCREATE: 1530 case SIOCIFDESTROY: 1531 if ((error = suser(td)) != 0) 1532 return (error); 1533 return ((cmd == SIOCIFCREATE) ? 1534 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1535 if_clone_destroy(ifr->ifr_name)); 1536 1537 case SIOCIFGCLONERS: 1538 return (if_clone_list((struct if_clonereq *)data)); 1539 } 1540 1541 ifp = ifunit(ifr->ifr_name); 1542 if (ifp == 0) 1543 return (ENXIO); 1544 1545 error = ifhwioctl(cmd, ifp, data, td); 1546 if (error != ENOIOCTL) 1547 return (error); 1548 1549 oif_flags = ifp->if_flags; 1550 if (so->so_proto == 0) 1551 return (EOPNOTSUPP); 1552 #ifndef COMPAT_43 1553 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1554 data, 1555 ifp, td)); 1556 #else 1557 { 1558 int ocmd = cmd; 1559 1560 switch (cmd) { 1561 1562 case SIOCSIFDSTADDR: 1563 case SIOCSIFADDR: 1564 case SIOCSIFBRDADDR: 1565 case SIOCSIFNETMASK: 1566 #if BYTE_ORDER != BIG_ENDIAN 1567 if (ifr->ifr_addr.sa_family == 0 && 1568 ifr->ifr_addr.sa_len < 16) { 1569 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1570 ifr->ifr_addr.sa_len = 16; 1571 } 1572 #else 1573 if (ifr->ifr_addr.sa_len == 0) 1574 ifr->ifr_addr.sa_len = 16; 1575 #endif 1576 break; 1577 1578 case OSIOCGIFADDR: 1579 cmd = SIOCGIFADDR; 1580 break; 1581 1582 case OSIOCGIFDSTADDR: 1583 cmd = SIOCGIFDSTADDR; 1584 break; 1585 1586 case OSIOCGIFBRDADDR: 1587 cmd = SIOCGIFBRDADDR; 1588 break; 1589 1590 case OSIOCGIFNETMASK: 1591 cmd = SIOCGIFNETMASK; 1592 } 1593 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1594 cmd, 1595 data, 1596 ifp, td)); 1597 switch (ocmd) { 1598 1599 case OSIOCGIFADDR: 1600 case OSIOCGIFDSTADDR: 1601 case OSIOCGIFBRDADDR: 1602 case OSIOCGIFNETMASK: 1603 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1604 1605 } 1606 } 1607 #endif /* COMPAT_43 */ 1608 1609 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1610 #ifdef INET6 1611 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1612 if (ifp->if_flags & IFF_UP) { 1613 int s = splimp(); 1614 in6_if_up(ifp); 1615 splx(s); 1616 } 1617 #endif 1618 } 1619 return (error); 1620 } 1621 1622 /* 1623 * The code common to handling reference counted flags, 1624 * e.g., in ifpromisc() and if_allmulti(). 1625 * The "pflag" argument can specify a permanent mode flag, 1626 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 1627 * 1628 * Only to be used on stack-owned flags, not driver-owned flags. 1629 */ 1630 static int 1631 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 1632 { 1633 struct ifreq ifr; 1634 int error; 1635 int oldflags, oldcount; 1636 1637 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 1638 ("if_setflag: setting driver-ownded flag %d", flag)); 1639 1640 /* Sanity checks to catch programming errors */ 1641 if (onswitch) { 1642 if (*refcount < 0) { 1643 if_printf(ifp, 1644 "refusing to increment negative refcount %d " 1645 "for interface flag %d\n", *refcount, flag); 1646 return (EINVAL); 1647 } 1648 } else { 1649 if (*refcount <= 0) { 1650 if_printf(ifp, 1651 "refusing to decrement non-positive refcount %d" 1652 "for interface flag %d\n", *refcount, flag); 1653 return (EINVAL); 1654 } 1655 } 1656 1657 /* In case this mode is permanent, just touch refcount */ 1658 if (ifp->if_flags & pflag) { 1659 *refcount += onswitch ? 1 : -1; 1660 return (0); 1661 } 1662 1663 /* Save ifnet parameters for if_ioctl() may fail */ 1664 oldcount = *refcount; 1665 oldflags = ifp->if_flags; 1666 1667 /* 1668 * See if we aren't the only and touching refcount is enough. 1669 * Actually toggle interface flag if we are the first or last. 1670 */ 1671 if (onswitch) { 1672 if ((*refcount)++) 1673 return (0); 1674 ifp->if_flags |= flag; 1675 } else { 1676 if (--(*refcount)) 1677 return (0); 1678 ifp->if_flags &= ~flag; 1679 } 1680 1681 /* Call down the driver since we've changed interface flags */ 1682 if (ifp->if_ioctl == NULL) { 1683 error = EOPNOTSUPP; 1684 goto recover; 1685 } 1686 ifr.ifr_flags = ifp->if_flags & 0xffff; 1687 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1688 IFF_LOCKGIANT(ifp); 1689 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1690 IFF_UNLOCKGIANT(ifp); 1691 if (error) 1692 goto recover; 1693 /* Notify userland that interface flags have changed */ 1694 rt_ifmsg(ifp); 1695 return (0); 1696 1697 recover: 1698 /* Recover after driver error */ 1699 *refcount = oldcount; 1700 ifp->if_flags = oldflags; 1701 return (error); 1702 } 1703 1704 /* 1705 * Set/clear promiscuous mode on interface ifp based on the truth value 1706 * of pswitch. The calls are reference counted so that only the first 1707 * "on" request actually has an effect, as does the final "off" request. 1708 * Results are undefined if the "off" and "on" requests are not matched. 1709 */ 1710 int 1711 ifpromisc(struct ifnet *ifp, int pswitch) 1712 { 1713 int error; 1714 int oldflags = ifp->if_flags; 1715 1716 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 1717 &ifp->if_pcount, pswitch); 1718 /* If promiscuous mode status has changed, log a message */ 1719 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 1720 log(LOG_INFO, "%s: promiscuous mode %s\n", 1721 ifp->if_xname, 1722 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1723 return (error); 1724 } 1725 1726 /* 1727 * Return interface configuration 1728 * of system. List may be used 1729 * in later ioctl's (above) to get 1730 * other information. 1731 */ 1732 /*ARGSUSED*/ 1733 static int 1734 ifconf(u_long cmd, caddr_t data) 1735 { 1736 struct ifconf *ifc = (struct ifconf *)data; 1737 #ifdef __amd64__ 1738 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 1739 struct ifconf ifc_swab; 1740 #endif 1741 struct ifnet *ifp; 1742 struct ifaddr *ifa; 1743 struct ifreq ifr; 1744 struct sbuf *sb; 1745 int error, full = 0, valid_len, max_len; 1746 1747 #ifdef __amd64__ 1748 if (cmd == SIOCGIFCONF32) { 1749 ifc_swab.ifc_len = ifc32->ifc_len; 1750 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 1751 ifc = &ifc_swab; 1752 } 1753 #endif 1754 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 1755 max_len = MAXPHYS - 1; 1756 1757 /* Prevent hostile input from being able to crash the system */ 1758 if (ifc->ifc_len <= 0) 1759 return (EINVAL); 1760 1761 again: 1762 if (ifc->ifc_len <= max_len) { 1763 max_len = ifc->ifc_len; 1764 full = 1; 1765 } 1766 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 1767 max_len = 0; 1768 valid_len = 0; 1769 1770 IFNET_RLOCK(); /* could sleep XXX */ 1771 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1772 int addrs; 1773 1774 /* 1775 * Zero the ifr_name buffer to make sure we don't 1776 * disclose the contents of the stack. 1777 */ 1778 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 1779 1780 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1781 >= sizeof(ifr.ifr_name)) { 1782 sbuf_delete(sb); 1783 IFNET_RUNLOCK(); 1784 return (ENAMETOOLONG); 1785 } 1786 1787 addrs = 0; 1788 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1789 struct sockaddr *sa = ifa->ifa_addr; 1790 1791 if (jailed(curthread->td_ucred) && 1792 prison_if(curthread->td_ucred, sa)) 1793 continue; 1794 addrs++; 1795 #ifdef COMPAT_43 1796 if (cmd == OSIOCGIFCONF) { 1797 struct osockaddr *osa = 1798 (struct osockaddr *)&ifr.ifr_addr; 1799 ifr.ifr_addr = *sa; 1800 osa->sa_family = sa->sa_family; 1801 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1802 max_len += sizeof(ifr); 1803 } else 1804 #endif 1805 if (sa->sa_len <= sizeof(*sa)) { 1806 ifr.ifr_addr = *sa; 1807 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1808 max_len += sizeof(ifr); 1809 } else { 1810 sbuf_bcat(sb, &ifr, 1811 offsetof(struct ifreq, ifr_addr)); 1812 max_len += offsetof(struct ifreq, ifr_addr); 1813 sbuf_bcat(sb, sa, sa->sa_len); 1814 max_len += sa->sa_len; 1815 } 1816 1817 if (!sbuf_overflowed(sb)) 1818 valid_len = sbuf_len(sb); 1819 } 1820 if (addrs == 0) { 1821 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1822 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1823 max_len += sizeof(ifr); 1824 1825 if (!sbuf_overflowed(sb)) 1826 valid_len = sbuf_len(sb); 1827 } 1828 } 1829 IFNET_RUNLOCK(); 1830 1831 /* 1832 * If we didn't allocate enough space (uncommon), try again. If 1833 * we have already allocated as much space as we are allowed, 1834 * return what we've got. 1835 */ 1836 if (valid_len != max_len && !full) { 1837 sbuf_delete(sb); 1838 goto again; 1839 } 1840 1841 ifc->ifc_len = valid_len; 1842 #ifdef __amd64__ 1843 if (cmd == SIOCGIFCONF32) 1844 ifc32->ifc_len = valid_len; 1845 #endif 1846 sbuf_finish(sb); 1847 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 1848 sbuf_delete(sb); 1849 return (error); 1850 } 1851 1852 /* 1853 * Just like ifpromisc(), but for all-multicast-reception mode. 1854 */ 1855 int 1856 if_allmulti(struct ifnet *ifp, int onswitch) 1857 { 1858 1859 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 1860 } 1861 1862 static struct ifmultiaddr * 1863 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 1864 { 1865 struct ifmultiaddr *ifma; 1866 1867 IF_ADDR_LOCK_ASSERT(ifp); 1868 1869 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1870 if (sa_equal(ifma->ifma_addr, sa)) 1871 break; 1872 } 1873 1874 return ifma; 1875 } 1876 1877 /* 1878 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 1879 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 1880 * the ifnet multicast address list here, so the caller must do that and 1881 * other setup work (such as notifying the device driver). The reference 1882 * count is initialized to 1. 1883 */ 1884 static struct ifmultiaddr * 1885 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 1886 int mflags) 1887 { 1888 struct ifmultiaddr *ifma; 1889 struct sockaddr *dupsa; 1890 1891 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags | 1892 M_ZERO); 1893 if (ifma == NULL) 1894 return (NULL); 1895 1896 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags); 1897 if (dupsa == NULL) { 1898 FREE(ifma, M_IFMADDR); 1899 return (NULL); 1900 } 1901 bcopy(sa, dupsa, sa->sa_len); 1902 ifma->ifma_addr = dupsa; 1903 1904 ifma->ifma_ifp = ifp; 1905 ifma->ifma_refcount = 1; 1906 ifma->ifma_protospec = NULL; 1907 1908 if (llsa == NULL) { 1909 ifma->ifma_lladdr = NULL; 1910 return (ifma); 1911 } 1912 1913 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags); 1914 if (dupsa == NULL) { 1915 FREE(ifma->ifma_addr, M_IFMADDR); 1916 FREE(ifma, M_IFMADDR); 1917 return (NULL); 1918 } 1919 bcopy(llsa, dupsa, llsa->sa_len); 1920 ifma->ifma_lladdr = dupsa; 1921 1922 return (ifma); 1923 } 1924 1925 /* 1926 * if_freemulti: free ifmultiaddr structure and possibly attached related 1927 * addresses. The caller is responsible for implementing reference 1928 * counting, notifying the driver, handling routing messages, and releasing 1929 * any dependent link layer state. 1930 */ 1931 static void 1932 if_freemulti(struct ifmultiaddr *ifma) 1933 { 1934 1935 KASSERT(ifma->ifma_refcount == 1, ("if_freemulti: refcount %d", 1936 ifma->ifma_refcount)); 1937 KASSERT(ifma->ifma_protospec == NULL, 1938 ("if_freemulti: protospec not NULL")); 1939 1940 if (ifma->ifma_lladdr != NULL) 1941 FREE(ifma->ifma_lladdr, M_IFMADDR); 1942 FREE(ifma->ifma_addr, M_IFMADDR); 1943 FREE(ifma, M_IFMADDR); 1944 } 1945 1946 /* 1947 * Register an additional multicast address with a network interface. 1948 * 1949 * - If the address is already present, bump the reference count on the 1950 * address and return. 1951 * - If the address is not link-layer, look up a link layer address. 1952 * - Allocate address structures for one or both addresses, and attach to the 1953 * multicast address list on the interface. If automatically adding a link 1954 * layer address, the protocol address will own a reference to the link 1955 * layer address, to be freed when it is freed. 1956 * - Notify the network device driver of an addition to the multicast address 1957 * list. 1958 * 1959 * 'sa' points to caller-owned memory with the desired multicast address. 1960 * 1961 * 'retifma' will be used to return a pointer to the resulting multicast 1962 * address reference, if desired. 1963 */ 1964 int 1965 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 1966 struct ifmultiaddr **retifma) 1967 { 1968 struct ifmultiaddr *ifma, *ll_ifma; 1969 struct sockaddr *llsa; 1970 int error; 1971 1972 /* 1973 * If the address is already present, return a new reference to it; 1974 * otherwise, allocate storage and set up a new address. 1975 */ 1976 IF_ADDR_LOCK(ifp); 1977 ifma = if_findmulti(ifp, sa); 1978 if (ifma != NULL) { 1979 ifma->ifma_refcount++; 1980 if (retifma != NULL) 1981 *retifma = ifma; 1982 IF_ADDR_UNLOCK(ifp); 1983 return (0); 1984 } 1985 1986 /* 1987 * The address isn't already present; resolve the protocol address 1988 * into a link layer address, and then look that up, bump its 1989 * refcount or allocate an ifma for that also. If 'llsa' was 1990 * returned, we will need to free it later. 1991 */ 1992 llsa = NULL; 1993 ll_ifma = NULL; 1994 if (ifp->if_resolvemulti != NULL) { 1995 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1996 if (error) 1997 goto unlock_out; 1998 } 1999 2000 /* 2001 * Allocate the new address. Don't hook it up yet, as we may also 2002 * need to allocate a link layer multicast address. 2003 */ 2004 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2005 if (ifma == NULL) { 2006 error = ENOMEM; 2007 goto free_llsa_out; 2008 } 2009 2010 /* 2011 * If a link layer address is found, we'll need to see if it's 2012 * already present in the address list, or allocate is as well. 2013 * When this block finishes, the link layer address will be on the 2014 * list. 2015 */ 2016 if (llsa != NULL) { 2017 ll_ifma = if_findmulti(ifp, llsa); 2018 if (ll_ifma == NULL) { 2019 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2020 if (ll_ifma == NULL) { 2021 if_freemulti(ifma); 2022 error = ENOMEM; 2023 goto free_llsa_out; 2024 } 2025 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2026 ifma_link); 2027 } else 2028 ll_ifma->ifma_refcount++; 2029 } 2030 2031 /* 2032 * We now have a new multicast address, ifma, and possibly a new or 2033 * referenced link layer address. Add the primary address to the 2034 * ifnet address list. 2035 */ 2036 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2037 2038 if (retifma != NULL) 2039 *retifma = ifma; 2040 2041 /* 2042 * Must generate the message while holding the lock so that 'ifma' 2043 * pointer is still valid. 2044 * 2045 * XXXRW: How come we don't announce ll_ifma? 2046 */ 2047 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2048 IF_ADDR_UNLOCK(ifp); 2049 2050 /* 2051 * We are certain we have added something, so call down to the 2052 * interface to let them know about it. 2053 */ 2054 if (ifp->if_ioctl != NULL) { 2055 IFF_LOCKGIANT(ifp); 2056 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2057 IFF_UNLOCKGIANT(ifp); 2058 } 2059 2060 if (llsa != NULL) 2061 FREE(llsa, M_IFMADDR); 2062 2063 return (0); 2064 2065 free_llsa_out: 2066 if (llsa != NULL) 2067 FREE(llsa, M_IFMADDR); 2068 2069 unlock_out: 2070 IF_ADDR_UNLOCK(ifp); 2071 return (error); 2072 } 2073 2074 /* 2075 * Remove a reference to a multicast address on this interface. Yell 2076 * if the request does not match an existing membership. 2077 */ 2078 int 2079 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2080 { 2081 struct ifmultiaddr *ifma, *ll_ifma; 2082 2083 IF_ADDR_LOCK(ifp); 2084 ifma = if_findmulti(ifp, sa); 2085 if (ifma == NULL) { 2086 IF_ADDR_UNLOCK(ifp); 2087 return ENOENT; 2088 } 2089 2090 if (ifma->ifma_refcount > 1) { 2091 ifma->ifma_refcount--; 2092 IF_ADDR_UNLOCK(ifp); 2093 return 0; 2094 } 2095 2096 sa = ifma->ifma_lladdr; 2097 if (sa != NULL) 2098 ll_ifma = if_findmulti(ifp, sa); 2099 else 2100 ll_ifma = NULL; 2101 2102 /* 2103 * XXXRW: How come we don't announce ll_ifma? 2104 */ 2105 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2106 2107 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2108 if_freemulti(ifma); 2109 2110 if (ll_ifma != NULL) { 2111 if (ll_ifma->ifma_refcount == 1) { 2112 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifma_link); 2113 if_freemulti(ll_ifma); 2114 } else 2115 ll_ifma->ifma_refcount--; 2116 } 2117 IF_ADDR_UNLOCK(ifp); 2118 2119 /* 2120 * Make sure the interface driver is notified 2121 * in the case of a link layer mcast group being left. 2122 */ 2123 if (ifp->if_ioctl) { 2124 IFF_LOCKGIANT(ifp); 2125 (void) (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2126 IFF_UNLOCKGIANT(ifp); 2127 } 2128 2129 return 0; 2130 } 2131 2132 /* 2133 * Set the link layer address on an interface. 2134 * 2135 * At this time we only support certain types of interfaces, 2136 * and we don't allow the length of the address to change. 2137 */ 2138 int 2139 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2140 { 2141 struct sockaddr_dl *sdl; 2142 struct ifaddr *ifa; 2143 struct ifreq ifr; 2144 2145 ifa = ifaddr_byindex(ifp->if_index); 2146 if (ifa == NULL) 2147 return (EINVAL); 2148 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2149 if (sdl == NULL) 2150 return (EINVAL); 2151 if (len != sdl->sdl_alen) /* don't allow length to change */ 2152 return (EINVAL); 2153 switch (ifp->if_type) { 2154 case IFT_ETHER: /* these types use struct arpcom */ 2155 case IFT_FDDI: 2156 case IFT_XETHER: 2157 case IFT_ISO88025: 2158 case IFT_L2VLAN: 2159 case IFT_BRIDGE: 2160 bcopy(lladdr, IFP2ENADDR(ifp), len); 2161 /* 2162 * XXX We also need to store the lladdr in LLADDR(sdl), 2163 * which is done below. This is a pain because we must 2164 * remember to keep the info in sync. 2165 */ 2166 /* FALLTHROUGH */ 2167 case IFT_ARCNET: 2168 bcopy(lladdr, LLADDR(sdl), len); 2169 break; 2170 default: 2171 return (ENODEV); 2172 } 2173 /* 2174 * If the interface is already up, we need 2175 * to re-init it in order to reprogram its 2176 * address filter. 2177 */ 2178 if ((ifp->if_flags & IFF_UP) != 0) { 2179 if (ifp->if_ioctl) { 2180 IFF_LOCKGIANT(ifp); 2181 ifp->if_flags &= ~IFF_UP; 2182 ifr.ifr_flags = ifp->if_flags & 0xffff; 2183 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2184 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2185 ifp->if_flags |= IFF_UP; 2186 ifr.ifr_flags = ifp->if_flags & 0xffff; 2187 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2188 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2189 IFF_UNLOCKGIANT(ifp); 2190 } 2191 #ifdef INET 2192 /* 2193 * Also send gratuitous ARPs to notify other nodes about 2194 * the address change. 2195 */ 2196 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2197 if (ifa->ifa_addr != NULL && 2198 ifa->ifa_addr->sa_family == AF_INET) 2199 arp_ifinit(ifp, ifa); 2200 } 2201 #endif 2202 } 2203 return (0); 2204 } 2205 2206 /* 2207 * The name argument must be a pointer to storage which will last as 2208 * long as the interface does. For physical devices, the result of 2209 * device_get_name(dev) is a good choice and for pseudo-devices a 2210 * static string works well. 2211 */ 2212 void 2213 if_initname(struct ifnet *ifp, const char *name, int unit) 2214 { 2215 ifp->if_dname = name; 2216 ifp->if_dunit = unit; 2217 if (unit != IF_DUNIT_NONE) 2218 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2219 else 2220 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2221 } 2222 2223 int 2224 if_printf(struct ifnet *ifp, const char * fmt, ...) 2225 { 2226 va_list ap; 2227 int retval; 2228 2229 retval = printf("%s: ", ifp->if_xname); 2230 va_start(ap, fmt); 2231 retval += vprintf(fmt, ap); 2232 va_end(ap); 2233 return (retval); 2234 } 2235 2236 /* 2237 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 2238 * be called without Giant. However, we often can't acquire the Giant lock 2239 * at those points; instead, we run it via a task queue that holds Giant via 2240 * if_start_deferred. 2241 * 2242 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 2243 * outstanding if_start_deferred() tasks that will run after the free. This 2244 * probably means waiting in if_detach(). 2245 */ 2246 void 2247 if_start(struct ifnet *ifp) 2248 { 2249 2250 NET_ASSERT_GIANT(); 2251 2252 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 2253 if (mtx_owned(&Giant)) 2254 (*(ifp)->if_start)(ifp); 2255 else 2256 taskqueue_enqueue(taskqueue_swi_giant, 2257 &ifp->if_starttask); 2258 } else 2259 (*(ifp)->if_start)(ifp); 2260 } 2261 2262 static void 2263 if_start_deferred(void *context, int pending) 2264 { 2265 struct ifnet *ifp; 2266 2267 /* 2268 * This code must be entered with Giant, and should never run if 2269 * we're not running with debug.mpsafenet. 2270 */ 2271 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 2272 GIANT_REQUIRED; 2273 2274 ifp = context; 2275 (ifp->if_start)(ifp); 2276 } 2277 2278 int 2279 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2280 { 2281 int active = 0; 2282 2283 IF_LOCK(ifq); 2284 if (_IF_QFULL(ifq)) { 2285 _IF_DROP(ifq); 2286 IF_UNLOCK(ifq); 2287 m_freem(m); 2288 return (0); 2289 } 2290 if (ifp != NULL) { 2291 ifp->if_obytes += m->m_pkthdr.len + adjust; 2292 if (m->m_flags & (M_BCAST|M_MCAST)) 2293 ifp->if_omcasts++; 2294 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2295 } 2296 _IF_ENQUEUE(ifq, m); 2297 IF_UNLOCK(ifq); 2298 if (ifp != NULL && !active) 2299 if_start(ifp); 2300 return (1); 2301 } 2302 2303 void 2304 if_register_com_alloc(u_char type, 2305 if_com_alloc_t *a, if_com_free_t *f) 2306 { 2307 2308 KASSERT(if_com_alloc[type] == NULL, 2309 ("if_register_com_alloc: %d already registered", type)); 2310 KASSERT(if_com_free[type] == NULL, 2311 ("if_register_com_alloc: %d free already registered", type)); 2312 2313 if_com_alloc[type] = a; 2314 if_com_free[type] = f; 2315 } 2316 2317 void 2318 if_deregister_com_alloc(u_char type) 2319 { 2320 2321 KASSERT(if_com_alloc[type] == NULL, 2322 ("if_deregister_com_alloc: %d not registered", type)); 2323 KASSERT(if_com_free[type] == NULL, 2324 ("if_deregister_com_alloc: %d free not registered", type)); 2325 if_com_alloc[type] = NULL; 2326 if_com_free[type] = NULL; 2327 }
Cache object: c9052376495b68cb48911e1dc98d7069
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