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/6.1/sys/net/if.c 155707 2006-02-15 03:37:15Z ps $ 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 IFNET_WLOCK(); 433 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 434 IFNET_WUNLOCK(); 435 /* 436 * XXX - 437 * The old code would work if the interface passed a pre-existing 438 * chain of ifaddrs to this code. We don't trust our callers to 439 * properly initialize the tailq, however, so we no longer allow 440 * this unlikely case. 441 */ 442 TAILQ_INIT(&ifp->if_addrhead); 443 TAILQ_INIT(&ifp->if_prefixhead); 444 TAILQ_INIT(&ifp->if_multiaddrs); 445 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 446 getmicrotime(&ifp->if_lastchange); 447 ifp->if_data.ifi_epoch = time_uptime; 448 ifp->if_data.ifi_datalen = sizeof(struct if_data); 449 450 #ifdef MAC 451 mac_init_ifnet(ifp); 452 mac_create_ifnet(ifp); 453 #endif 454 455 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 456 unit2minor(ifp->if_index), 457 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 458 net_cdevsw.d_name, ifp->if_xname); 459 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 460 net_cdevsw.d_name, ifp->if_index); 461 462 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 463 464 /* 465 * create a Link Level name for this device 466 */ 467 namelen = strlen(ifp->if_xname); 468 /* 469 * Always save enough space for any possiable name so we can do 470 * a rename in place later. 471 */ 472 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 473 socksize = masklen + ifp->if_addrlen; 474 if (socksize < sizeof(*sdl)) 475 socksize = sizeof(*sdl); 476 socksize = roundup2(socksize, sizeof(long)); 477 ifasize = sizeof(*ifa) + 2 * socksize; 478 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 479 IFA_LOCK_INIT(ifa); 480 sdl = (struct sockaddr_dl *)(ifa + 1); 481 sdl->sdl_len = socksize; 482 sdl->sdl_family = AF_LINK; 483 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 484 sdl->sdl_nlen = namelen; 485 sdl->sdl_index = ifp->if_index; 486 sdl->sdl_type = ifp->if_type; 487 ifaddr_byindex(ifp->if_index) = ifa; 488 ifa->ifa_ifp = ifp; 489 ifa->ifa_rtrequest = link_rtrequest; 490 ifa->ifa_addr = (struct sockaddr *)sdl; 491 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 492 ifa->ifa_netmask = (struct sockaddr *)sdl; 493 sdl->sdl_len = masklen; 494 while (namelen != 0) 495 sdl->sdl_data[--namelen] = 0xff; 496 ifa->ifa_refcnt = 1; 497 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 498 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 499 ifp->if_snd.altq_type = 0; 500 ifp->if_snd.altq_disc = NULL; 501 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 502 ifp->if_snd.altq_tbr = NULL; 503 ifp->if_snd.altq_ifp = ifp; 504 505 if (domain_init_status >= 2) 506 if_attachdomain1(ifp); 507 508 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 509 510 /* Announce the interface. */ 511 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 512 } 513 514 static void 515 if_attachdomain(void *dummy) 516 { 517 struct ifnet *ifp; 518 int s; 519 520 s = splnet(); 521 TAILQ_FOREACH(ifp, &ifnet, if_link) 522 if_attachdomain1(ifp); 523 splx(s); 524 } 525 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 526 if_attachdomain, NULL); 527 528 static void 529 if_attachdomain1(struct ifnet *ifp) 530 { 531 struct domain *dp; 532 int s; 533 534 s = splnet(); 535 536 /* 537 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 538 * cannot lock ifp->if_afdata initialization, entirely. 539 */ 540 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 541 splx(s); 542 return; 543 } 544 if (ifp->if_afdata_initialized >= domain_init_status) { 545 IF_AFDATA_UNLOCK(ifp); 546 splx(s); 547 printf("if_attachdomain called more than once on %s\n", 548 ifp->if_xname); 549 return; 550 } 551 ifp->if_afdata_initialized = domain_init_status; 552 IF_AFDATA_UNLOCK(ifp); 553 554 /* address family dependent data region */ 555 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 556 for (dp = domains; dp; dp = dp->dom_next) { 557 if (dp->dom_ifattach) 558 ifp->if_afdata[dp->dom_family] = 559 (*dp->dom_ifattach)(ifp); 560 } 561 562 splx(s); 563 } 564 565 /* 566 * Remove any network addresses from an interface. 567 */ 568 569 void 570 if_purgeaddrs(struct ifnet *ifp) 571 { 572 struct ifaddr *ifa, *next; 573 574 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 575 576 if (ifa->ifa_addr->sa_family == AF_LINK) 577 continue; 578 #ifdef INET 579 /* XXX: Ugly!! ad hoc just for INET */ 580 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 581 struct ifaliasreq ifr; 582 583 bzero(&ifr, sizeof(ifr)); 584 ifr.ifra_addr = *ifa->ifa_addr; 585 if (ifa->ifa_dstaddr) 586 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 587 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 588 NULL) == 0) 589 continue; 590 } 591 #endif /* INET */ 592 #ifdef INET6 593 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 594 in6_purgeaddr(ifa); 595 /* ifp_addrhead is already updated */ 596 continue; 597 } 598 #endif /* INET6 */ 599 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 600 IFAFREE(ifa); 601 } 602 } 603 604 /* 605 * Detach an interface, removing it from the 606 * list of "active" interfaces and freeing the struct ifnet. 607 * 608 * XXXRW: There are some significant questions about event ordering, and 609 * how to prevent things from starting to use the interface during detach. 610 */ 611 void 612 if_detach(struct ifnet *ifp) 613 { 614 struct ifaddr *ifa; 615 struct radix_node_head *rnh; 616 int s; 617 int i; 618 struct domain *dp; 619 struct ifnet *iter; 620 int found; 621 622 /* 623 * Remove/wait for pending events. 624 */ 625 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 626 627 #ifdef DEV_CARP 628 /* Maybe hook to the generalized departure handler above?!? */ 629 if (ifp->if_carp) 630 carp_ifdetach(ifp); 631 #endif 632 633 /* 634 * Remove routes and flush queues. 635 */ 636 s = splnet(); 637 if_down(ifp); 638 #ifdef ALTQ 639 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 640 altq_disable(&ifp->if_snd); 641 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 642 altq_detach(&ifp->if_snd); 643 #endif 644 645 if_purgeaddrs(ifp); 646 647 #ifdef INET 648 in_ifdetach(ifp); 649 #endif 650 651 #ifdef INET6 652 /* 653 * Remove all IPv6 kernel structs related to ifp. This should be done 654 * before removing routing entries below, since IPv6 interface direct 655 * routes are expected to be removed by the IPv6-specific kernel API. 656 * Otherwise, the kernel will detect some inconsistency and bark it. 657 */ 658 in6_ifdetach(ifp); 659 #endif 660 /* 661 * Remove address from ifindex_table[] and maybe decrement if_index. 662 * Clean up all addresses. 663 */ 664 ifaddr_byindex(ifp->if_index) = NULL; 665 destroy_dev(ifdev_byindex(ifp->if_index)); 666 ifdev_byindex(ifp->if_index) = NULL; 667 668 /* We can now free link ifaddr. */ 669 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 670 ifa = TAILQ_FIRST(&ifp->if_addrhead); 671 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 672 IFAFREE(ifa); 673 } 674 675 /* 676 * Delete all remaining routes using this interface 677 * Unfortuneatly the only way to do this is to slog through 678 * the entire routing table looking for routes which point 679 * to this interface...oh well... 680 */ 681 for (i = 1; i <= AF_MAX; i++) { 682 if ((rnh = rt_tables[i]) == NULL) 683 continue; 684 RADIX_NODE_HEAD_LOCK(rnh); 685 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 686 RADIX_NODE_HEAD_UNLOCK(rnh); 687 } 688 689 /* Announce that the interface is gone. */ 690 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 691 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 692 693 IF_AFDATA_LOCK(ifp); 694 for (dp = domains; dp; dp = dp->dom_next) { 695 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 696 (*dp->dom_ifdetach)(ifp, 697 ifp->if_afdata[dp->dom_family]); 698 } 699 IF_AFDATA_UNLOCK(ifp); 700 701 #ifdef MAC 702 mac_destroy_ifnet(ifp); 703 #endif /* MAC */ 704 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 705 knlist_clear(&ifp->if_klist, 0); 706 knlist_destroy(&ifp->if_klist); 707 IFNET_WLOCK(); 708 found = 0; 709 TAILQ_FOREACH(iter, &ifnet, if_link) 710 if (iter == ifp) { 711 found = 1; 712 break; 713 } 714 if (found) 715 TAILQ_REMOVE(&ifnet, ifp, if_link); 716 IFNET_WUNLOCK(); 717 mtx_destroy(&ifp->if_snd.ifq_mtx); 718 IF_AFDATA_DESTROY(ifp); 719 splx(s); 720 } 721 722 /* 723 * Delete Routes for a Network Interface 724 * 725 * Called for each routing entry via the rnh->rnh_walktree() call above 726 * to delete all route entries referencing a detaching network interface. 727 * 728 * Arguments: 729 * rn pointer to node in the routing table 730 * arg argument passed to rnh->rnh_walktree() - detaching interface 731 * 732 * Returns: 733 * 0 successful 734 * errno failed - reason indicated 735 * 736 */ 737 static int 738 if_rtdel(struct radix_node *rn, void *arg) 739 { 740 struct rtentry *rt = (struct rtentry *)rn; 741 struct ifnet *ifp = arg; 742 int err; 743 744 if (rt->rt_ifp == ifp) { 745 746 /* 747 * Protect (sorta) against walktree recursion problems 748 * with cloned routes 749 */ 750 if ((rt->rt_flags & RTF_UP) == 0) 751 return (0); 752 753 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 754 rt_mask(rt), rt->rt_flags, 755 (struct rtentry **) NULL); 756 if (err) { 757 log(LOG_WARNING, "if_rtdel: error %d\n", err); 758 } 759 } 760 761 return (0); 762 } 763 764 #define sa_equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 765 766 /* 767 * Locate an interface based on a complete address. 768 */ 769 /*ARGSUSED*/ 770 struct ifaddr * 771 ifa_ifwithaddr(struct sockaddr *addr) 772 { 773 struct ifnet *ifp; 774 struct ifaddr *ifa; 775 776 IFNET_RLOCK(); 777 TAILQ_FOREACH(ifp, &ifnet, if_link) 778 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 779 if (ifa->ifa_addr->sa_family != addr->sa_family) 780 continue; 781 if (sa_equal(addr, ifa->ifa_addr)) 782 goto done; 783 /* IP6 doesn't have broadcast */ 784 if ((ifp->if_flags & IFF_BROADCAST) && 785 ifa->ifa_broadaddr && 786 ifa->ifa_broadaddr->sa_len != 0 && 787 sa_equal(ifa->ifa_broadaddr, addr)) 788 goto done; 789 } 790 ifa = NULL; 791 done: 792 IFNET_RUNLOCK(); 793 return (ifa); 794 } 795 796 /* 797 * Locate the point to point interface with a given destination address. 798 */ 799 /*ARGSUSED*/ 800 struct ifaddr * 801 ifa_ifwithdstaddr(struct sockaddr *addr) 802 { 803 struct ifnet *ifp; 804 struct ifaddr *ifa; 805 806 IFNET_RLOCK(); 807 TAILQ_FOREACH(ifp, &ifnet, if_link) { 808 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 809 continue; 810 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 811 if (ifa->ifa_addr->sa_family != addr->sa_family) 812 continue; 813 if (ifa->ifa_dstaddr && 814 sa_equal(addr, ifa->ifa_dstaddr)) 815 goto done; 816 } 817 } 818 ifa = NULL; 819 done: 820 IFNET_RUNLOCK(); 821 return (ifa); 822 } 823 824 /* 825 * Find an interface on a specific network. If many, choice 826 * is most specific found. 827 */ 828 struct ifaddr * 829 ifa_ifwithnet(struct sockaddr *addr) 830 { 831 struct ifnet *ifp; 832 struct ifaddr *ifa; 833 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 834 u_int af = addr->sa_family; 835 char *addr_data = addr->sa_data, *cplim; 836 837 /* 838 * AF_LINK addresses can be looked up directly by their index number, 839 * so do that if we can. 840 */ 841 if (af == AF_LINK) { 842 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 843 if (sdl->sdl_index && sdl->sdl_index <= if_index) 844 return (ifaddr_byindex(sdl->sdl_index)); 845 } 846 847 /* 848 * Scan though each interface, looking for ones that have 849 * addresses in this address family. 850 */ 851 IFNET_RLOCK(); 852 TAILQ_FOREACH(ifp, &ifnet, if_link) { 853 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 854 char *cp, *cp2, *cp3; 855 856 if (ifa->ifa_addr->sa_family != af) 857 next: continue; 858 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 859 /* 860 * This is a bit broken as it doesn't 861 * take into account that the remote end may 862 * be a single node in the network we are 863 * looking for. 864 * The trouble is that we don't know the 865 * netmask for the remote end. 866 */ 867 if (ifa->ifa_dstaddr != 0 && 868 sa_equal(addr, ifa->ifa_dstaddr)) 869 goto done; 870 } else { 871 /* 872 * if we have a special address handler, 873 * then use it instead of the generic one. 874 */ 875 if (ifa->ifa_claim_addr) { 876 if ((*ifa->ifa_claim_addr)(ifa, addr)) 877 goto done; 878 continue; 879 } 880 881 /* 882 * Scan all the bits in the ifa's address. 883 * If a bit dissagrees with what we are 884 * looking for, mask it with the netmask 885 * to see if it really matters. 886 * (A byte at a time) 887 */ 888 if (ifa->ifa_netmask == 0) 889 continue; 890 cp = addr_data; 891 cp2 = ifa->ifa_addr->sa_data; 892 cp3 = ifa->ifa_netmask->sa_data; 893 cplim = ifa->ifa_netmask->sa_len 894 + (char *)ifa->ifa_netmask; 895 while (cp3 < cplim) 896 if ((*cp++ ^ *cp2++) & *cp3++) 897 goto next; /* next address! */ 898 /* 899 * If the netmask of what we just found 900 * is more specific than what we had before 901 * (if we had one) then remember the new one 902 * before continuing to search 903 * for an even better one. 904 */ 905 if (ifa_maybe == 0 || 906 rn_refines((caddr_t)ifa->ifa_netmask, 907 (caddr_t)ifa_maybe->ifa_netmask)) 908 ifa_maybe = ifa; 909 } 910 } 911 } 912 ifa = ifa_maybe; 913 done: 914 IFNET_RUNLOCK(); 915 return (ifa); 916 } 917 918 /* 919 * Find an interface address specific to an interface best matching 920 * a given address. 921 */ 922 struct ifaddr * 923 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 924 { 925 struct ifaddr *ifa; 926 char *cp, *cp2, *cp3; 927 char *cplim; 928 struct ifaddr *ifa_maybe = 0; 929 u_int af = addr->sa_family; 930 931 if (af >= AF_MAX) 932 return (0); 933 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 934 if (ifa->ifa_addr->sa_family != af) 935 continue; 936 if (ifa_maybe == 0) 937 ifa_maybe = ifa; 938 if (ifa->ifa_netmask == 0) { 939 if (sa_equal(addr, ifa->ifa_addr) || 940 (ifa->ifa_dstaddr && 941 sa_equal(addr, ifa->ifa_dstaddr))) 942 goto done; 943 continue; 944 } 945 if (ifp->if_flags & IFF_POINTOPOINT) { 946 if (sa_equal(addr, ifa->ifa_dstaddr)) 947 goto done; 948 } else { 949 cp = addr->sa_data; 950 cp2 = ifa->ifa_addr->sa_data; 951 cp3 = ifa->ifa_netmask->sa_data; 952 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 953 for (; cp3 < cplim; cp3++) 954 if ((*cp++ ^ *cp2++) & *cp3) 955 break; 956 if (cp3 == cplim) 957 goto done; 958 } 959 } 960 ifa = ifa_maybe; 961 done: 962 return (ifa); 963 } 964 965 #include <net/route.h> 966 967 /* 968 * Default action when installing a route with a Link Level gateway. 969 * Lookup an appropriate real ifa to point to. 970 * This should be moved to /sys/net/link.c eventually. 971 */ 972 static void 973 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 974 { 975 struct ifaddr *ifa, *oifa; 976 struct sockaddr *dst; 977 struct ifnet *ifp; 978 979 RT_LOCK_ASSERT(rt); 980 981 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 982 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 983 return; 984 ifa = ifaof_ifpforaddr(dst, ifp); 985 if (ifa) { 986 IFAREF(ifa); /* XXX */ 987 oifa = rt->rt_ifa; 988 rt->rt_ifa = ifa; 989 IFAFREE(oifa); 990 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 991 ifa->ifa_rtrequest(cmd, rt, info); 992 } 993 } 994 995 /* 996 * Mark an interface down and notify protocols of 997 * the transition. 998 * NOTE: must be called at splnet or eqivalent. 999 */ 1000 static void 1001 if_unroute(struct ifnet *ifp, int flag, int fam) 1002 { 1003 struct ifaddr *ifa; 1004 1005 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1006 1007 ifp->if_flags &= ~flag; 1008 getmicrotime(&ifp->if_lastchange); 1009 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1010 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1011 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1012 if_qflush(&ifp->if_snd); 1013 #ifdef DEV_CARP 1014 if (ifp->if_carp) 1015 carp_carpdev_state(ifp->if_carp); 1016 #endif 1017 rt_ifmsg(ifp); 1018 } 1019 1020 /* 1021 * Mark an interface up and notify protocols of 1022 * the transition. 1023 * NOTE: must be called at splnet or eqivalent. 1024 */ 1025 static void 1026 if_route(struct ifnet *ifp, int flag, int fam) 1027 { 1028 struct ifaddr *ifa; 1029 1030 KASSERT(flag == IFF_UP, ("if_route: 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_IFUP, ifa->ifa_addr); 1037 #ifdef DEV_CARP 1038 if (ifp->if_carp) 1039 carp_carpdev_state(ifp->if_carp); 1040 #endif 1041 rt_ifmsg(ifp); 1042 #ifdef INET6 1043 in6_if_up(ifp); 1044 #endif 1045 } 1046 1047 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1048 1049 /* 1050 * Handle a change in the interface link state. To avoid LORs 1051 * between driver lock and upper layer locks, as well as possible 1052 * recursions, we post event to taskqueue, and all job 1053 * is done in static do_link_state_change(). 1054 */ 1055 void 1056 if_link_state_change(struct ifnet *ifp, int link_state) 1057 { 1058 /* Return if state hasn't changed. */ 1059 if (ifp->if_link_state == link_state) 1060 return; 1061 1062 ifp->if_link_state = link_state; 1063 1064 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1065 } 1066 1067 static void 1068 do_link_state_change(void *arg, int pending) 1069 { 1070 struct ifnet *ifp = (struct ifnet *)arg; 1071 int link_state = ifp->if_link_state; 1072 int link; 1073 1074 /* Notify that the link state has changed. */ 1075 rt_ifmsg(ifp); 1076 if (link_state == LINK_STATE_UP) 1077 link = NOTE_LINKUP; 1078 else if (link_state == LINK_STATE_DOWN) 1079 link = NOTE_LINKDOWN; 1080 else 1081 link = NOTE_LINKINV; 1082 KNOTE_UNLOCKED(&ifp->if_klist, link); 1083 if (ifp->if_nvlans != 0) 1084 (*vlan_link_state_p)(ifp, link); 1085 1086 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1087 IFP2AC(ifp)->ac_netgraph != NULL) 1088 (*ng_ether_link_state_p)(ifp, link_state); 1089 #ifdef DEV_CARP 1090 if (ifp->if_carp) 1091 carp_carpdev_state(ifp->if_carp); 1092 #endif 1093 if (ifp->if_bridge) { 1094 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1095 (*bstp_linkstate_p)(ifp, link_state); 1096 } 1097 1098 devctl_notify("IFNET", ifp->if_xname, 1099 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1100 if (pending > 1) 1101 if_printf(ifp, "%d link states coalesced\n", pending); 1102 if (log_link_state_change) 1103 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1104 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1105 } 1106 1107 /* 1108 * Mark an interface down and notify protocols of 1109 * the transition. 1110 * NOTE: must be called at splnet or eqivalent. 1111 */ 1112 void 1113 if_down(struct ifnet *ifp) 1114 { 1115 1116 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1117 } 1118 1119 /* 1120 * Mark an interface up and notify protocols of 1121 * the transition. 1122 * NOTE: must be called at splnet or eqivalent. 1123 */ 1124 void 1125 if_up(struct ifnet *ifp) 1126 { 1127 1128 if_route(ifp, IFF_UP, AF_UNSPEC); 1129 } 1130 1131 /* 1132 * Flush an interface queue. 1133 */ 1134 static void 1135 if_qflush(struct ifaltq *ifq) 1136 { 1137 struct mbuf *m, *n; 1138 1139 IFQ_LOCK(ifq); 1140 #ifdef ALTQ 1141 if (ALTQ_IS_ENABLED(ifq)) 1142 ALTQ_PURGE(ifq); 1143 #endif 1144 n = ifq->ifq_head; 1145 while ((m = n) != 0) { 1146 n = m->m_act; 1147 m_freem(m); 1148 } 1149 ifq->ifq_head = 0; 1150 ifq->ifq_tail = 0; 1151 ifq->ifq_len = 0; 1152 IFQ_UNLOCK(ifq); 1153 } 1154 1155 /* 1156 * Handle interface watchdog timer routines. Called 1157 * from softclock, we decrement timers (if set) and 1158 * call the appropriate interface routine on expiration. 1159 * 1160 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1161 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1162 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1163 */ 1164 static void 1165 if_slowtimo(void *arg) 1166 { 1167 struct ifnet *ifp; 1168 int s = splimp(); 1169 1170 IFNET_RLOCK(); 1171 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1172 if (ifp->if_timer == 0 || --ifp->if_timer) 1173 continue; 1174 if (ifp->if_watchdog) 1175 (*ifp->if_watchdog)(ifp); 1176 } 1177 IFNET_RUNLOCK(); 1178 splx(s); 1179 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1180 } 1181 1182 /* 1183 * Map interface name to 1184 * interface structure pointer. 1185 */ 1186 struct ifnet * 1187 ifunit(const char *name) 1188 { 1189 struct ifnet *ifp; 1190 1191 IFNET_RLOCK(); 1192 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1193 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1194 break; 1195 } 1196 IFNET_RUNLOCK(); 1197 return (ifp); 1198 } 1199 1200 /* 1201 * Hardware specific interface ioctls. 1202 */ 1203 static int 1204 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1205 { 1206 struct ifreq *ifr; 1207 struct ifstat *ifs; 1208 int error = 0; 1209 int new_flags, temp_flags; 1210 size_t namelen, onamelen; 1211 char new_name[IFNAMSIZ]; 1212 struct ifaddr *ifa; 1213 struct sockaddr_dl *sdl; 1214 1215 ifr = (struct ifreq *)data; 1216 switch (cmd) { 1217 case SIOCGIFINDEX: 1218 ifr->ifr_index = ifp->if_index; 1219 break; 1220 1221 case SIOCGIFFLAGS: 1222 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1223 ifr->ifr_flags = temp_flags & 0xffff; 1224 ifr->ifr_flagshigh = temp_flags >> 16; 1225 break; 1226 1227 case SIOCGIFCAP: 1228 ifr->ifr_reqcap = ifp->if_capabilities; 1229 ifr->ifr_curcap = ifp->if_capenable; 1230 break; 1231 1232 #ifdef MAC 1233 case SIOCGIFMAC: 1234 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1235 break; 1236 #endif 1237 1238 case SIOCGIFMETRIC: 1239 ifr->ifr_metric = ifp->if_metric; 1240 break; 1241 1242 case SIOCGIFMTU: 1243 ifr->ifr_mtu = ifp->if_mtu; 1244 break; 1245 1246 case SIOCGIFPHYS: 1247 ifr->ifr_phys = ifp->if_physical; 1248 break; 1249 1250 case SIOCSIFFLAGS: 1251 error = suser(td); 1252 if (error) 1253 return (error); 1254 /* 1255 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1256 * check, so we don't need special handling here yet. 1257 */ 1258 new_flags = (ifr->ifr_flags & 0xffff) | 1259 (ifr->ifr_flagshigh << 16); 1260 if (ifp->if_flags & IFF_SMART) { 1261 /* Smart drivers twiddle their own routes */ 1262 } else if (ifp->if_flags & IFF_UP && 1263 (new_flags & IFF_UP) == 0) { 1264 int s = splimp(); 1265 if_down(ifp); 1266 splx(s); 1267 } else if (new_flags & IFF_UP && 1268 (ifp->if_flags & IFF_UP) == 0) { 1269 int s = splimp(); 1270 if_up(ifp); 1271 splx(s); 1272 } 1273 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1274 (new_flags &~ IFF_CANTCHANGE); 1275 if (new_flags & IFF_PPROMISC) { 1276 /* Permanently promiscuous mode requested */ 1277 ifp->if_flags |= IFF_PROMISC; 1278 } else if (ifp->if_pcount == 0) { 1279 ifp->if_flags &= ~IFF_PROMISC; 1280 } 1281 if (ifp->if_ioctl != NULL) { 1282 IFF_LOCKGIANT(ifp); 1283 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1284 IFF_UNLOCKGIANT(ifp); 1285 } 1286 getmicrotime(&ifp->if_lastchange); 1287 break; 1288 1289 case SIOCSIFCAP: 1290 error = suser(td); 1291 if (error) 1292 return (error); 1293 if (ifp->if_ioctl == NULL) 1294 return (EOPNOTSUPP); 1295 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1296 return (EINVAL); 1297 IFF_LOCKGIANT(ifp); 1298 error = (*ifp->if_ioctl)(ifp, cmd, data); 1299 IFF_UNLOCKGIANT(ifp); 1300 if (error == 0) 1301 getmicrotime(&ifp->if_lastchange); 1302 break; 1303 1304 #ifdef MAC 1305 case SIOCSIFMAC: 1306 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1307 break; 1308 #endif 1309 1310 case SIOCSIFNAME: 1311 error = suser(td); 1312 if (error != 0) 1313 return (error); 1314 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1315 if (error != 0) 1316 return (error); 1317 if (new_name[0] == '\0') 1318 return (EINVAL); 1319 if (ifunit(new_name) != NULL) 1320 return (EEXIST); 1321 1322 /* Announce the departure of the interface. */ 1323 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1324 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1325 1326 log(LOG_INFO, "%s: changing name to '%s'\n", 1327 ifp->if_xname, new_name); 1328 1329 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1330 ifa = ifaddr_byindex(ifp->if_index); 1331 IFA_LOCK(ifa); 1332 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1333 namelen = strlen(new_name); 1334 onamelen = sdl->sdl_nlen; 1335 /* 1336 * Move the address if needed. This is safe because we 1337 * allocate space for a name of length IFNAMSIZ when we 1338 * create this in if_attach(). 1339 */ 1340 if (namelen != onamelen) { 1341 bcopy(sdl->sdl_data + onamelen, 1342 sdl->sdl_data + namelen, sdl->sdl_alen); 1343 } 1344 bcopy(new_name, sdl->sdl_data, namelen); 1345 sdl->sdl_nlen = namelen; 1346 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1347 bzero(sdl->sdl_data, onamelen); 1348 while (namelen != 0) 1349 sdl->sdl_data[--namelen] = 0xff; 1350 IFA_UNLOCK(ifa); 1351 1352 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1353 /* Announce the return of the interface. */ 1354 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1355 break; 1356 1357 case SIOCSIFMETRIC: 1358 error = suser(td); 1359 if (error) 1360 return (error); 1361 ifp->if_metric = ifr->ifr_metric; 1362 getmicrotime(&ifp->if_lastchange); 1363 break; 1364 1365 case SIOCSIFPHYS: 1366 error = suser(td); 1367 if (error) 1368 return (error); 1369 if (ifp->if_ioctl == NULL) 1370 return (EOPNOTSUPP); 1371 IFF_LOCKGIANT(ifp); 1372 error = (*ifp->if_ioctl)(ifp, cmd, data); 1373 IFF_UNLOCKGIANT(ifp); 1374 if (error == 0) 1375 getmicrotime(&ifp->if_lastchange); 1376 break; 1377 1378 case SIOCSIFMTU: 1379 { 1380 u_long oldmtu = ifp->if_mtu; 1381 1382 error = suser(td); 1383 if (error) 1384 return (error); 1385 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1386 return (EINVAL); 1387 if (ifp->if_ioctl == NULL) 1388 return (EOPNOTSUPP); 1389 IFF_LOCKGIANT(ifp); 1390 error = (*ifp->if_ioctl)(ifp, cmd, data); 1391 IFF_UNLOCKGIANT(ifp); 1392 if (error == 0) { 1393 getmicrotime(&ifp->if_lastchange); 1394 rt_ifmsg(ifp); 1395 } 1396 /* 1397 * If the link MTU changed, do network layer specific procedure. 1398 */ 1399 if (ifp->if_mtu != oldmtu) { 1400 #ifdef INET6 1401 nd6_setmtu(ifp); 1402 #endif 1403 } 1404 break; 1405 } 1406 1407 case SIOCADDMULTI: 1408 case SIOCDELMULTI: 1409 error = suser(td); 1410 if (error) 1411 return (error); 1412 1413 /* Don't allow group membership on non-multicast interfaces. */ 1414 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1415 return (EOPNOTSUPP); 1416 1417 /* Don't let users screw up protocols' entries. */ 1418 if (ifr->ifr_addr.sa_family != AF_LINK) 1419 return (EINVAL); 1420 1421 if (cmd == SIOCADDMULTI) { 1422 struct ifmultiaddr *ifma; 1423 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1424 } else { 1425 error = if_delmulti(ifp, &ifr->ifr_addr); 1426 } 1427 if (error == 0) 1428 getmicrotime(&ifp->if_lastchange); 1429 break; 1430 1431 case SIOCSIFPHYADDR: 1432 case SIOCDIFPHYADDR: 1433 #ifdef INET6 1434 case SIOCSIFPHYADDR_IN6: 1435 #endif 1436 case SIOCSLIFPHYADDR: 1437 case SIOCSIFMEDIA: 1438 case SIOCSIFGENERIC: 1439 error = suser(td); 1440 if (error) 1441 return (error); 1442 if (ifp->if_ioctl == NULL) 1443 return (EOPNOTSUPP); 1444 IFF_LOCKGIANT(ifp); 1445 error = (*ifp->if_ioctl)(ifp, cmd, data); 1446 IFF_UNLOCKGIANT(ifp); 1447 if (error == 0) 1448 getmicrotime(&ifp->if_lastchange); 1449 break; 1450 1451 case SIOCGIFSTATUS: 1452 ifs = (struct ifstat *)data; 1453 ifs->ascii[0] = '\0'; 1454 1455 case SIOCGIFPSRCADDR: 1456 case SIOCGIFPDSTADDR: 1457 case SIOCGLIFPHYADDR: 1458 case SIOCGIFMEDIA: 1459 case SIOCGIFGENERIC: 1460 if (ifp->if_ioctl == NULL) 1461 return (EOPNOTSUPP); 1462 IFF_LOCKGIANT(ifp); 1463 error = (*ifp->if_ioctl)(ifp, cmd, data); 1464 IFF_UNLOCKGIANT(ifp); 1465 break; 1466 1467 case SIOCSIFLLADDR: 1468 error = suser(td); 1469 if (error) 1470 return (error); 1471 error = if_setlladdr(ifp, 1472 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1473 break; 1474 1475 default: 1476 error = ENOIOCTL; 1477 break; 1478 } 1479 return (error); 1480 } 1481 1482 /* 1483 * Interface ioctls. 1484 */ 1485 int 1486 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1487 { 1488 struct ifnet *ifp; 1489 struct ifreq *ifr; 1490 int error; 1491 int oif_flags; 1492 1493 switch (cmd) { 1494 case SIOCGIFCONF: 1495 case OSIOCGIFCONF: 1496 #ifdef __amd64__ 1497 case SIOCGIFCONF32: 1498 #endif 1499 return (ifconf(cmd, data)); 1500 } 1501 ifr = (struct ifreq *)data; 1502 1503 switch (cmd) { 1504 case SIOCIFCREATE: 1505 case SIOCIFDESTROY: 1506 if ((error = suser(td)) != 0) 1507 return (error); 1508 return ((cmd == SIOCIFCREATE) ? 1509 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1510 if_clone_destroy(ifr->ifr_name)); 1511 1512 case SIOCIFGCLONERS: 1513 return (if_clone_list((struct if_clonereq *)data)); 1514 } 1515 1516 ifp = ifunit(ifr->ifr_name); 1517 if (ifp == 0) 1518 return (ENXIO); 1519 1520 error = ifhwioctl(cmd, ifp, data, td); 1521 if (error != ENOIOCTL) 1522 return (error); 1523 1524 oif_flags = ifp->if_flags; 1525 if (so->so_proto == 0) 1526 return (EOPNOTSUPP); 1527 #ifndef COMPAT_43 1528 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1529 data, 1530 ifp, td)); 1531 #else 1532 { 1533 int ocmd = cmd; 1534 1535 switch (cmd) { 1536 1537 case SIOCSIFDSTADDR: 1538 case SIOCSIFADDR: 1539 case SIOCSIFBRDADDR: 1540 case SIOCSIFNETMASK: 1541 #if BYTE_ORDER != BIG_ENDIAN 1542 if (ifr->ifr_addr.sa_family == 0 && 1543 ifr->ifr_addr.sa_len < 16) { 1544 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1545 ifr->ifr_addr.sa_len = 16; 1546 } 1547 #else 1548 if (ifr->ifr_addr.sa_len == 0) 1549 ifr->ifr_addr.sa_len = 16; 1550 #endif 1551 break; 1552 1553 case OSIOCGIFADDR: 1554 cmd = SIOCGIFADDR; 1555 break; 1556 1557 case OSIOCGIFDSTADDR: 1558 cmd = SIOCGIFDSTADDR; 1559 break; 1560 1561 case OSIOCGIFBRDADDR: 1562 cmd = SIOCGIFBRDADDR; 1563 break; 1564 1565 case OSIOCGIFNETMASK: 1566 cmd = SIOCGIFNETMASK; 1567 } 1568 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1569 cmd, 1570 data, 1571 ifp, td)); 1572 switch (ocmd) { 1573 1574 case OSIOCGIFADDR: 1575 case OSIOCGIFDSTADDR: 1576 case OSIOCGIFBRDADDR: 1577 case OSIOCGIFNETMASK: 1578 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1579 1580 } 1581 } 1582 #endif /* COMPAT_43 */ 1583 1584 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1585 #ifdef INET6 1586 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1587 if (ifp->if_flags & IFF_UP) { 1588 int s = splimp(); 1589 in6_if_up(ifp); 1590 splx(s); 1591 } 1592 #endif 1593 } 1594 return (error); 1595 } 1596 1597 /* 1598 * The code common to handling reference counted flags, 1599 * e.g., in ifpromisc() and if_allmulti(). 1600 * The "pflag" argument can specify a permanent mode flag, 1601 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 1602 * 1603 * Only to be used on stack-owned flags, not driver-owned flags. 1604 */ 1605 static int 1606 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 1607 { 1608 struct ifreq ifr; 1609 int error; 1610 int oldflags, oldcount; 1611 1612 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 1613 ("if_setflag: setting driver-ownded flag %d", flag)); 1614 1615 /* Sanity checks to catch programming errors */ 1616 if (onswitch) { 1617 if (*refcount < 0) { 1618 if_printf(ifp, 1619 "refusing to increment negative refcount %d " 1620 "for interface flag %d\n", *refcount, flag); 1621 return (EINVAL); 1622 } 1623 } else { 1624 if (*refcount <= 0) { 1625 if_printf(ifp, 1626 "refusing to decrement non-positive refcount %d" 1627 "for interface flag %d\n", *refcount, flag); 1628 return (EINVAL); 1629 } 1630 } 1631 1632 /* In case this mode is permanent, just touch refcount */ 1633 if (ifp->if_flags & pflag) { 1634 *refcount += onswitch ? 1 : -1; 1635 return (0); 1636 } 1637 1638 /* Save ifnet parameters for if_ioctl() may fail */ 1639 oldcount = *refcount; 1640 oldflags = ifp->if_flags; 1641 1642 /* 1643 * See if we aren't the only and touching refcount is enough. 1644 * Actually toggle interface flag if we are the first or last. 1645 */ 1646 if (onswitch) { 1647 if ((*refcount)++) 1648 return (0); 1649 ifp->if_flags |= flag; 1650 } else { 1651 if (--(*refcount)) 1652 return (0); 1653 ifp->if_flags &= ~flag; 1654 } 1655 1656 /* Call down the driver since we've changed interface flags */ 1657 if (ifp->if_ioctl == NULL) { 1658 error = EOPNOTSUPP; 1659 goto recover; 1660 } 1661 ifr.ifr_flags = ifp->if_flags & 0xffff; 1662 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1663 IFF_LOCKGIANT(ifp); 1664 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1665 IFF_UNLOCKGIANT(ifp); 1666 if (error) 1667 goto recover; 1668 /* Notify userland that interface flags have changed */ 1669 rt_ifmsg(ifp); 1670 return (0); 1671 1672 recover: 1673 /* Recover after driver error */ 1674 *refcount = oldcount; 1675 ifp->if_flags = oldflags; 1676 return (error); 1677 } 1678 1679 /* 1680 * Set/clear promiscuous mode on interface ifp based on the truth value 1681 * of pswitch. The calls are reference counted so that only the first 1682 * "on" request actually has an effect, as does the final "off" request. 1683 * Results are undefined if the "off" and "on" requests are not matched. 1684 */ 1685 int 1686 ifpromisc(struct ifnet *ifp, int pswitch) 1687 { 1688 int error; 1689 int oldflags = ifp->if_flags; 1690 1691 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 1692 &ifp->if_pcount, pswitch); 1693 /* If promiscuous mode status has changed, log a message */ 1694 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 1695 log(LOG_INFO, "%s: promiscuous mode %s\n", 1696 ifp->if_xname, 1697 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1698 return (error); 1699 } 1700 1701 /* 1702 * Return interface configuration 1703 * of system. List may be used 1704 * in later ioctl's (above) to get 1705 * other information. 1706 */ 1707 /*ARGSUSED*/ 1708 static int 1709 ifconf(u_long cmd, caddr_t data) 1710 { 1711 struct ifconf *ifc = (struct ifconf *)data; 1712 #ifdef __amd64__ 1713 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 1714 struct ifconf ifc_swab; 1715 #endif 1716 struct ifnet *ifp; 1717 struct ifaddr *ifa; 1718 struct ifreq ifr; 1719 struct sbuf *sb; 1720 int error, full = 0, valid_len, max_len; 1721 1722 #ifdef __amd64__ 1723 if (cmd == SIOCGIFCONF32) { 1724 ifc_swab.ifc_len = ifc32->ifc_len; 1725 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 1726 ifc = &ifc_swab; 1727 } 1728 #endif 1729 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 1730 max_len = MAXPHYS - 1; 1731 1732 /* Prevent hostile input from being able to crash the system */ 1733 if (ifc->ifc_len <= 0) 1734 return (EINVAL); 1735 1736 again: 1737 if (ifc->ifc_len <= max_len) { 1738 max_len = ifc->ifc_len; 1739 full = 1; 1740 } 1741 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 1742 max_len = 0; 1743 valid_len = 0; 1744 1745 IFNET_RLOCK(); /* could sleep XXX */ 1746 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1747 int addrs; 1748 1749 /* 1750 * Zero the ifr_name buffer to make sure we don't 1751 * disclose the contents of the stack. 1752 */ 1753 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 1754 1755 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1756 >= sizeof(ifr.ifr_name)) { 1757 sbuf_delete(sb); 1758 IFNET_RUNLOCK(); 1759 return (ENAMETOOLONG); 1760 } 1761 1762 addrs = 0; 1763 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1764 struct sockaddr *sa = ifa->ifa_addr; 1765 1766 if (jailed(curthread->td_ucred) && 1767 prison_if(curthread->td_ucred, sa)) 1768 continue; 1769 addrs++; 1770 #ifdef COMPAT_43 1771 if (cmd == OSIOCGIFCONF) { 1772 struct osockaddr *osa = 1773 (struct osockaddr *)&ifr.ifr_addr; 1774 ifr.ifr_addr = *sa; 1775 osa->sa_family = sa->sa_family; 1776 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1777 max_len += sizeof(ifr); 1778 } else 1779 #endif 1780 if (sa->sa_len <= sizeof(*sa)) { 1781 ifr.ifr_addr = *sa; 1782 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1783 max_len += sizeof(ifr); 1784 } else { 1785 sbuf_bcat(sb, &ifr, 1786 offsetof(struct ifreq, ifr_addr)); 1787 max_len += offsetof(struct ifreq, ifr_addr); 1788 sbuf_bcat(sb, sa, sa->sa_len); 1789 max_len += sa->sa_len; 1790 } 1791 1792 if (!sbuf_overflowed(sb)) 1793 valid_len = sbuf_len(sb); 1794 } 1795 if (addrs == 0) { 1796 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1797 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1798 max_len += sizeof(ifr); 1799 1800 if (!sbuf_overflowed(sb)) 1801 valid_len = sbuf_len(sb); 1802 } 1803 } 1804 IFNET_RUNLOCK(); 1805 1806 /* 1807 * If we didn't allocate enough space (uncommon), try again. If 1808 * we have already allocated as much space as we are allowed, 1809 * return what we've got. 1810 */ 1811 if (valid_len != max_len && !full) { 1812 sbuf_delete(sb); 1813 goto again; 1814 } 1815 1816 ifc->ifc_len = valid_len; 1817 #ifdef __amd64__ 1818 if (cmd == SIOCGIFCONF32) 1819 ifc32->ifc_len = valid_len; 1820 #endif 1821 sbuf_finish(sb); 1822 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 1823 sbuf_delete(sb); 1824 return (error); 1825 } 1826 1827 /* 1828 * Just like ifpromisc(), but for all-multicast-reception mode. 1829 */ 1830 int 1831 if_allmulti(struct ifnet *ifp, int onswitch) 1832 { 1833 1834 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 1835 } 1836 1837 static struct ifmultiaddr * 1838 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 1839 { 1840 struct ifmultiaddr *ifma; 1841 1842 IF_ADDR_LOCK_ASSERT(ifp); 1843 1844 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1845 if (sa_equal(ifma->ifma_addr, sa)) 1846 break; 1847 } 1848 1849 return ifma; 1850 } 1851 1852 /* 1853 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 1854 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 1855 * the ifnet multicast address list here, so the caller must do that and 1856 * other setup work (such as notifying the device driver). The reference 1857 * count is initialized to 1. 1858 */ 1859 static struct ifmultiaddr * 1860 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 1861 int mflags) 1862 { 1863 struct ifmultiaddr *ifma; 1864 struct sockaddr *dupsa; 1865 1866 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags | 1867 M_ZERO); 1868 if (ifma == NULL) 1869 return (NULL); 1870 1871 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags); 1872 if (dupsa == NULL) { 1873 FREE(ifma, M_IFMADDR); 1874 return (NULL); 1875 } 1876 bcopy(sa, dupsa, sa->sa_len); 1877 ifma->ifma_addr = dupsa; 1878 1879 ifma->ifma_ifp = ifp; 1880 ifma->ifma_refcount = 1; 1881 ifma->ifma_protospec = NULL; 1882 1883 if (llsa == NULL) { 1884 ifma->ifma_lladdr = NULL; 1885 return (ifma); 1886 } 1887 1888 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags); 1889 if (dupsa == NULL) { 1890 FREE(ifma->ifma_addr, M_IFMADDR); 1891 FREE(ifma, M_IFMADDR); 1892 return (NULL); 1893 } 1894 bcopy(llsa, dupsa, llsa->sa_len); 1895 ifma->ifma_lladdr = dupsa; 1896 1897 return (ifma); 1898 } 1899 1900 /* 1901 * if_freemulti: free ifmultiaddr structure and possibly attached related 1902 * addresses. The caller is responsible for implementing reference 1903 * counting, notifying the driver, handling routing messages, and releasing 1904 * any dependent link layer state. 1905 */ 1906 static void 1907 if_freemulti(struct ifmultiaddr *ifma) 1908 { 1909 1910 KASSERT(ifma->ifma_refcount == 1, ("if_freemulti: refcount %d", 1911 ifma->ifma_refcount)); 1912 KASSERT(ifma->ifma_protospec == NULL, 1913 ("if_freemulti: protospec not NULL")); 1914 1915 if (ifma->ifma_lladdr != NULL) 1916 FREE(ifma->ifma_lladdr, M_IFMADDR); 1917 FREE(ifma->ifma_addr, M_IFMADDR); 1918 FREE(ifma, M_IFMADDR); 1919 } 1920 1921 /* 1922 * Register an additional multicast address with a network interface. 1923 * 1924 * - If the address is already present, bump the reference count on the 1925 * address and return. 1926 * - If the address is not link-layer, look up a link layer address. 1927 * - Allocate address structures for one or both addresses, and attach to the 1928 * multicast address list on the interface. If automatically adding a link 1929 * layer address, the protocol address will own a reference to the link 1930 * layer address, to be freed when it is freed. 1931 * - Notify the network device driver of an addition to the multicast address 1932 * list. 1933 * 1934 * 'sa' points to caller-owned memory with the desired multicast address. 1935 * 1936 * 'retifma' will be used to return a pointer to the resulting multicast 1937 * address reference, if desired. 1938 */ 1939 int 1940 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 1941 struct ifmultiaddr **retifma) 1942 { 1943 struct ifmultiaddr *ifma, *ll_ifma; 1944 struct sockaddr *llsa; 1945 int error; 1946 1947 /* 1948 * If the address is already present, return a new reference to it; 1949 * otherwise, allocate storage and set up a new address. 1950 */ 1951 IF_ADDR_LOCK(ifp); 1952 ifma = if_findmulti(ifp, sa); 1953 if (ifma != NULL) { 1954 ifma->ifma_refcount++; 1955 if (retifma != NULL) 1956 *retifma = ifma; 1957 IF_ADDR_UNLOCK(ifp); 1958 return (0); 1959 } 1960 1961 /* 1962 * The address isn't already present; resolve the protocol address 1963 * into a link layer address, and then look that up, bump its 1964 * refcount or allocate an ifma for that also. If 'llsa' was 1965 * returned, we will need to free it later. 1966 */ 1967 llsa = NULL; 1968 ll_ifma = NULL; 1969 if (ifp->if_resolvemulti != NULL) { 1970 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1971 if (error) 1972 goto unlock_out; 1973 } 1974 1975 /* 1976 * Allocate the new address. Don't hook it up yet, as we may also 1977 * need to allocate a link layer multicast address. 1978 */ 1979 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 1980 if (ifma == NULL) { 1981 error = ENOMEM; 1982 goto free_llsa_out; 1983 } 1984 1985 /* 1986 * If a link layer address is found, we'll need to see if it's 1987 * already present in the address list, or allocate is as well. 1988 * When this block finishes, the link layer address will be on the 1989 * list. 1990 */ 1991 if (llsa != NULL) { 1992 ll_ifma = if_findmulti(ifp, llsa); 1993 if (ll_ifma == NULL) { 1994 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 1995 if (ll_ifma == NULL) { 1996 if_freemulti(ifma); 1997 error = ENOMEM; 1998 goto free_llsa_out; 1999 } 2000 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2001 ifma_link); 2002 } else 2003 ll_ifma->ifma_refcount++; 2004 } 2005 2006 /* 2007 * We now have a new multicast address, ifma, and possibly a new or 2008 * referenced link layer address. Add the primary address to the 2009 * ifnet address list. 2010 */ 2011 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2012 2013 if (retifma != NULL) 2014 *retifma = ifma; 2015 2016 /* 2017 * Must generate the message while holding the lock so that 'ifma' 2018 * pointer is still valid. 2019 * 2020 * XXXRW: How come we don't announce ll_ifma? 2021 */ 2022 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2023 IF_ADDR_UNLOCK(ifp); 2024 2025 /* 2026 * We are certain we have added something, so call down to the 2027 * interface to let them know about it. 2028 */ 2029 if (ifp->if_ioctl != NULL) { 2030 IFF_LOCKGIANT(ifp); 2031 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2032 IFF_UNLOCKGIANT(ifp); 2033 } 2034 2035 if (llsa != NULL) 2036 FREE(llsa, M_IFMADDR); 2037 2038 return (0); 2039 2040 free_llsa_out: 2041 if (llsa != NULL) 2042 FREE(llsa, M_IFMADDR); 2043 2044 unlock_out: 2045 IF_ADDR_UNLOCK(ifp); 2046 return (error); 2047 } 2048 2049 /* 2050 * Remove a reference to a multicast address on this interface. Yell 2051 * if the request does not match an existing membership. 2052 */ 2053 int 2054 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2055 { 2056 struct ifmultiaddr *ifma, *ll_ifma; 2057 2058 IF_ADDR_LOCK(ifp); 2059 ifma = if_findmulti(ifp, sa); 2060 if (ifma == NULL) { 2061 IF_ADDR_UNLOCK(ifp); 2062 return ENOENT; 2063 } 2064 2065 if (ifma->ifma_refcount > 1) { 2066 ifma->ifma_refcount--; 2067 IF_ADDR_UNLOCK(ifp); 2068 return 0; 2069 } 2070 2071 sa = ifma->ifma_lladdr; 2072 if (sa != NULL) 2073 ll_ifma = if_findmulti(ifp, sa); 2074 else 2075 ll_ifma = NULL; 2076 2077 /* 2078 * XXXRW: How come we don't announce ll_ifma? 2079 */ 2080 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2081 2082 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2083 if_freemulti(ifma); 2084 2085 if (ll_ifma != NULL) { 2086 if (ll_ifma->ifma_refcount == 1) { 2087 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifma_link); 2088 if_freemulti(ll_ifma); 2089 } else 2090 ll_ifma->ifma_refcount--; 2091 } 2092 IF_ADDR_UNLOCK(ifp); 2093 2094 /* 2095 * Make sure the interface driver is notified 2096 * in the case of a link layer mcast group being left. 2097 */ 2098 if (ifp->if_ioctl) { 2099 IFF_LOCKGIANT(ifp); 2100 (void) (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2101 IFF_UNLOCKGIANT(ifp); 2102 } 2103 2104 return 0; 2105 } 2106 2107 /* 2108 * Set the link layer address on an interface. 2109 * 2110 * At this time we only support certain types of interfaces, 2111 * and we don't allow the length of the address to change. 2112 */ 2113 int 2114 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2115 { 2116 struct sockaddr_dl *sdl; 2117 struct ifaddr *ifa; 2118 struct ifreq ifr; 2119 2120 ifa = ifaddr_byindex(ifp->if_index); 2121 if (ifa == NULL) 2122 return (EINVAL); 2123 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2124 if (sdl == NULL) 2125 return (EINVAL); 2126 if (len != sdl->sdl_alen) /* don't allow length to change */ 2127 return (EINVAL); 2128 switch (ifp->if_type) { 2129 case IFT_ETHER: /* these types use struct arpcom */ 2130 case IFT_FDDI: 2131 case IFT_XETHER: 2132 case IFT_ISO88025: 2133 case IFT_L2VLAN: 2134 case IFT_BRIDGE: 2135 bcopy(lladdr, IFP2ENADDR(ifp), len); 2136 /* 2137 * XXX We also need to store the lladdr in LLADDR(sdl), 2138 * which is done below. This is a pain because we must 2139 * remember to keep the info in sync. 2140 */ 2141 /* FALLTHROUGH */ 2142 case IFT_ARCNET: 2143 bcopy(lladdr, LLADDR(sdl), len); 2144 break; 2145 default: 2146 return (ENODEV); 2147 } 2148 /* 2149 * If the interface is already up, we need 2150 * to re-init it in order to reprogram its 2151 * address filter. 2152 */ 2153 if ((ifp->if_flags & IFF_UP) != 0) { 2154 if (ifp->if_ioctl) { 2155 IFF_LOCKGIANT(ifp); 2156 ifp->if_flags &= ~IFF_UP; 2157 ifr.ifr_flags = ifp->if_flags & 0xffff; 2158 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2159 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2160 ifp->if_flags |= IFF_UP; 2161 ifr.ifr_flags = ifp->if_flags & 0xffff; 2162 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2163 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2164 IFF_UNLOCKGIANT(ifp); 2165 } 2166 #ifdef INET 2167 /* 2168 * Also send gratuitous ARPs to notify other nodes about 2169 * the address change. 2170 */ 2171 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2172 if (ifa->ifa_addr != NULL && 2173 ifa->ifa_addr->sa_family == AF_INET) 2174 arp_ifinit(ifp, ifa); 2175 } 2176 #endif 2177 } 2178 return (0); 2179 } 2180 2181 /* 2182 * The name argument must be a pointer to storage which will last as 2183 * long as the interface does. For physical devices, the result of 2184 * device_get_name(dev) is a good choice and for pseudo-devices a 2185 * static string works well. 2186 */ 2187 void 2188 if_initname(struct ifnet *ifp, const char *name, int unit) 2189 { 2190 ifp->if_dname = name; 2191 ifp->if_dunit = unit; 2192 if (unit != IF_DUNIT_NONE) 2193 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2194 else 2195 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2196 } 2197 2198 int 2199 if_printf(struct ifnet *ifp, const char * fmt, ...) 2200 { 2201 va_list ap; 2202 int retval; 2203 2204 retval = printf("%s: ", ifp->if_xname); 2205 va_start(ap, fmt); 2206 retval += vprintf(fmt, ap); 2207 va_end(ap); 2208 return (retval); 2209 } 2210 2211 /* 2212 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 2213 * be called without Giant. However, we often can't acquire the Giant lock 2214 * at those points; instead, we run it via a task queue that holds Giant via 2215 * if_start_deferred. 2216 * 2217 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 2218 * outstanding if_start_deferred() tasks that will run after the free. This 2219 * probably means waiting in if_detach(). 2220 */ 2221 void 2222 if_start(struct ifnet *ifp) 2223 { 2224 2225 NET_ASSERT_GIANT(); 2226 2227 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 2228 if (mtx_owned(&Giant)) 2229 (*(ifp)->if_start)(ifp); 2230 else 2231 taskqueue_enqueue(taskqueue_swi_giant, 2232 &ifp->if_starttask); 2233 } else 2234 (*(ifp)->if_start)(ifp); 2235 } 2236 2237 static void 2238 if_start_deferred(void *context, int pending) 2239 { 2240 struct ifnet *ifp; 2241 2242 /* 2243 * This code must be entered with Giant, and should never run if 2244 * we're not running with debug.mpsafenet. 2245 */ 2246 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 2247 GIANT_REQUIRED; 2248 2249 ifp = context; 2250 (ifp->if_start)(ifp); 2251 } 2252 2253 int 2254 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2255 { 2256 int active = 0; 2257 2258 IF_LOCK(ifq); 2259 if (_IF_QFULL(ifq)) { 2260 _IF_DROP(ifq); 2261 IF_UNLOCK(ifq); 2262 m_freem(m); 2263 return (0); 2264 } 2265 if (ifp != NULL) { 2266 ifp->if_obytes += m->m_pkthdr.len + adjust; 2267 if (m->m_flags & (M_BCAST|M_MCAST)) 2268 ifp->if_omcasts++; 2269 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2270 } 2271 _IF_ENQUEUE(ifq, m); 2272 IF_UNLOCK(ifq); 2273 if (ifp != NULL && !active) 2274 if_start(ifp); 2275 return (1); 2276 } 2277 2278 void 2279 if_register_com_alloc(u_char type, 2280 if_com_alloc_t *a, if_com_free_t *f) 2281 { 2282 2283 KASSERT(if_com_alloc[type] == NULL, 2284 ("if_register_com_alloc: %d already registered", type)); 2285 KASSERT(if_com_free[type] == NULL, 2286 ("if_register_com_alloc: %d free already registered", type)); 2287 2288 if_com_alloc[type] = a; 2289 if_com_free[type] = f; 2290 } 2291 2292 void 2293 if_deregister_com_alloc(u_char type) 2294 { 2295 2296 KASSERT(if_com_alloc[type] == NULL, 2297 ("if_deregister_com_alloc: %d not registered", type)); 2298 KASSERT(if_com_free[type] == NULL, 2299 ("if_deregister_com_alloc: %d free not registered", type)); 2300 if_com_alloc[type] = NULL; 2301 if_com_free[type] = NULL; 2302 }
Cache object: 94f51886a0b32aecab1830c497cbfe86
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