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/6.3/sys/net/if.c 173886 2007-11-24 19:45:58Z cvs2svn $ 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 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 99 100 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 101 102 static void if_attachdomain(void *); 103 static void if_attachdomain1(struct ifnet *); 104 static int ifconf(u_long, caddr_t); 105 static void if_grow(void); 106 static void if_init(void *); 107 static void if_check(void *); 108 static void if_qflush(struct ifaltq *); 109 static void if_route(struct ifnet *, int flag, int fam); 110 static int if_setflag(struct ifnet *, int, int, int *, int); 111 static void if_slowtimo(void *); 112 static void if_unroute(struct ifnet *, int flag, int fam); 113 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 114 static int if_rtdel(struct radix_node *, void *); 115 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 116 static void if_start_deferred(void *context, int pending); 117 static void do_link_state_change(void *, int); 118 #ifdef INET6 119 /* 120 * XXX: declare here to avoid to include many inet6 related files.. 121 * should be more generalized? 122 */ 123 extern void nd6_setmtu(struct ifnet *); 124 #endif 125 126 int if_index = 0; 127 struct ifindex_entry *ifindex_table = NULL; 128 int ifqmaxlen = IFQ_MAXLEN; 129 struct ifnethead ifnet; /* depend on static init XXX */ 130 struct mtx ifnet_lock; 131 static if_com_alloc_t *if_com_alloc[256]; 132 static if_com_free_t *if_com_free[256]; 133 134 static int if_indexlim = 8; 135 static struct knlist ifklist; 136 137 static void filt_netdetach(struct knote *kn); 138 static int filt_netdev(struct knote *kn, long hint); 139 140 static struct filterops netdev_filtops = 141 { 1, NULL, filt_netdetach, filt_netdev }; 142 143 /* 144 * System initialization 145 */ 146 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 147 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 148 149 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 150 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 151 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 152 153 static d_open_t netopen; 154 static d_close_t netclose; 155 static d_ioctl_t netioctl; 156 static d_kqfilter_t netkqfilter; 157 158 static struct cdevsw net_cdevsw = { 159 .d_version = D_VERSION, 160 .d_flags = D_NEEDGIANT, 161 .d_open = netopen, 162 .d_close = netclose, 163 .d_ioctl = netioctl, 164 .d_name = "net", 165 .d_kqfilter = netkqfilter, 166 }; 167 168 static int 169 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 170 { 171 return (0); 172 } 173 174 static int 175 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 176 { 177 return (0); 178 } 179 180 static int 181 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 182 { 183 struct ifnet *ifp; 184 int error, idx; 185 186 /* only support interface specific ioctls */ 187 if (IOCGROUP(cmd) != 'i') 188 return (EOPNOTSUPP); 189 idx = minor(dev); 190 if (idx == 0) { 191 /* 192 * special network device, not interface. 193 */ 194 if (cmd == SIOCGIFCONF) 195 return (ifconf(cmd, data)); /* XXX remove cmd */ 196 #ifdef __amd64__ 197 if (cmd == SIOCGIFCONF32) 198 return (ifconf(cmd, data)); /* XXX remove cmd */ 199 #endif 200 return (EOPNOTSUPP); 201 } 202 203 ifp = ifnet_byindex(idx); 204 if (ifp == NULL) 205 return (ENXIO); 206 207 error = ifhwioctl(cmd, ifp, data, td); 208 if (error == ENOIOCTL) 209 error = EOPNOTSUPP; 210 return (error); 211 } 212 213 static int 214 netkqfilter(struct cdev *dev, struct knote *kn) 215 { 216 struct knlist *klist; 217 struct ifnet *ifp; 218 int idx; 219 220 switch (kn->kn_filter) { 221 case EVFILT_NETDEV: 222 kn->kn_fop = &netdev_filtops; 223 break; 224 default: 225 return (EINVAL); 226 } 227 228 idx = minor(dev); 229 if (idx == 0) { 230 klist = &ifklist; 231 } else { 232 ifp = ifnet_byindex(idx); 233 if (ifp == NULL) 234 return (1); 235 klist = &ifp->if_klist; 236 } 237 238 kn->kn_hook = (caddr_t)klist; 239 240 knlist_add(klist, kn, 0); 241 242 return (0); 243 } 244 245 static void 246 filt_netdetach(struct knote *kn) 247 { 248 struct knlist *klist = (struct knlist *)kn->kn_hook; 249 250 knlist_remove(klist, kn, 0); 251 } 252 253 static int 254 filt_netdev(struct knote *kn, long hint) 255 { 256 struct knlist *klist = (struct knlist *)kn->kn_hook; 257 258 /* 259 * Currently NOTE_EXIT is abused to indicate device detach. 260 */ 261 if (hint == NOTE_EXIT) { 262 kn->kn_data = NOTE_LINKINV; 263 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 264 knlist_remove_inevent(klist, kn); 265 return (1); 266 } 267 if (hint != 0) 268 kn->kn_data = hint; /* current status */ 269 if (kn->kn_sfflags & hint) 270 kn->kn_fflags |= hint; 271 return (kn->kn_fflags != 0); 272 } 273 274 /* 275 * Network interface utility routines. 276 * 277 * Routines with ifa_ifwith* names take sockaddr *'s as 278 * parameters. 279 */ 280 /* ARGSUSED*/ 281 static void 282 if_init(void *dummy __unused) 283 { 284 285 IFNET_LOCK_INIT(); 286 TAILQ_INIT(&ifnet); 287 knlist_init(&ifklist, NULL, NULL, NULL, NULL); 288 if_grow(); /* create initial table */ 289 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 290 UID_ROOT, GID_WHEEL, 0600, "network"); 291 if_clone_init(); 292 } 293 294 static void 295 if_grow(void) 296 { 297 u_int n; 298 struct ifindex_entry *e; 299 300 if_indexlim <<= 1; 301 n = if_indexlim * sizeof(*e); 302 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 303 if (ifindex_table != NULL) { 304 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 305 free((caddr_t)ifindex_table, M_IFNET); 306 } 307 ifindex_table = e; 308 } 309 310 /* ARGSUSED*/ 311 static void 312 if_check(void *dummy __unused) 313 { 314 struct ifnet *ifp; 315 int s; 316 317 s = splimp(); 318 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 319 TAILQ_FOREACH(ifp, &ifnet, if_link) { 320 if (ifp->if_snd.ifq_maxlen == 0) { 321 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 322 ifp->if_snd.ifq_maxlen = ifqmaxlen; 323 } 324 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 325 if_printf(ifp, 326 "XXX: driver didn't initialize queue mtx\n"); 327 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 328 MTX_NETWORK_LOCK, MTX_DEF); 329 } 330 } 331 IFNET_RUNLOCK(); 332 splx(s); 333 if_slowtimo(0); 334 } 335 336 /* 337 * Allocate a struct ifnet and in index for an interface. 338 */ 339 struct ifnet* 340 if_alloc(u_char type) 341 { 342 struct ifnet *ifp; 343 344 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 345 346 /* 347 * Try to find an empty slot below if_index. If we fail, take 348 * the next slot. 349 * 350 * XXX: should be locked! 351 */ 352 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) { 353 if (ifnet_byindex(ifp->if_index) == NULL) 354 break; 355 } 356 /* Catch if_index overflow. */ 357 if (ifp->if_index < 1) { 358 free(ifp, M_IFNET); 359 return (NULL); 360 } 361 if (ifp->if_index > if_index) 362 if_index = ifp->if_index; 363 if (if_index >= if_indexlim) 364 if_grow(); 365 ifnet_byindex(ifp->if_index) = ifp; 366 367 ifp->if_type = type; 368 369 if (if_com_alloc[type] != NULL) { 370 ifp->if_l2com = if_com_alloc[type](type, ifp); 371 if (ifp->if_l2com == NULL) { 372 free(ifp, M_IFNET); 373 return (NULL); 374 } 375 } 376 IF_ADDR_LOCK_INIT(ifp); 377 378 return (ifp); 379 } 380 381 void 382 if_free(struct ifnet *ifp) 383 { 384 385 /* Do not add code to this function! Add it to if_free_type(). */ 386 if_free_type(ifp, ifp->if_type); 387 } 388 389 void 390 if_free_type(struct ifnet *ifp, u_char type) 391 { 392 393 if (ifp != ifnet_byindex(ifp->if_index)) { 394 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 395 __func__); 396 return; 397 } 398 399 IF_ADDR_LOCK_DESTROY(ifp); 400 401 ifnet_byindex(ifp->if_index) = NULL; 402 403 /* XXX: should be locked with if_findindex() */ 404 while (if_index > 0 && ifnet_byindex(if_index) == NULL) 405 if_index--; 406 407 if (if_com_free[type] != NULL) 408 if_com_free[type](ifp->if_l2com, type); 409 410 free(ifp, M_IFNET); 411 }; 412 413 /* 414 * Attach an interface to the 415 * list of "active" interfaces. 416 */ 417 void 418 if_attach(struct ifnet *ifp) 419 { 420 unsigned socksize, ifasize; 421 int namelen, masklen; 422 struct sockaddr_dl *sdl; 423 struct ifaddr *ifa; 424 425 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 426 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 427 ifp->if_xname); 428 429 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 430 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 431 IF_AFDATA_LOCK_INIT(ifp); 432 ifp->if_afdata_initialized = 0; 433 /* 434 * XXX - 435 * The old code would work if the interface passed a pre-existing 436 * chain of ifaddrs to this code. We don't trust our callers to 437 * properly initialize the tailq, however, so we no longer allow 438 * this unlikely case. 439 */ 440 TAILQ_INIT(&ifp->if_addrhead); 441 TAILQ_INIT(&ifp->if_prefixhead); 442 TAILQ_INIT(&ifp->if_multiaddrs); 443 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 444 getmicrotime(&ifp->if_lastchange); 445 ifp->if_data.ifi_epoch = time_uptime; 446 ifp->if_data.ifi_datalen = sizeof(struct if_data); 447 448 #ifdef MAC 449 mac_init_ifnet(ifp); 450 mac_create_ifnet(ifp); 451 #endif 452 453 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 454 unit2minor(ifp->if_index), 455 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 456 net_cdevsw.d_name, ifp->if_xname); 457 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 458 net_cdevsw.d_name, ifp->if_index); 459 460 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 461 462 /* 463 * create a Link Level name for this device 464 */ 465 namelen = strlen(ifp->if_xname); 466 /* 467 * Always save enough space for any possiable name so we can do 468 * a rename in place later. 469 */ 470 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 471 socksize = masklen + ifp->if_addrlen; 472 if (socksize < sizeof(*sdl)) 473 socksize = sizeof(*sdl); 474 socksize = roundup2(socksize, sizeof(long)); 475 ifasize = sizeof(*ifa) + 2 * socksize; 476 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 477 IFA_LOCK_INIT(ifa); 478 sdl = (struct sockaddr_dl *)(ifa + 1); 479 sdl->sdl_len = socksize; 480 sdl->sdl_family = AF_LINK; 481 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 482 sdl->sdl_nlen = namelen; 483 sdl->sdl_index = ifp->if_index; 484 sdl->sdl_type = ifp->if_type; 485 ifaddr_byindex(ifp->if_index) = ifa; 486 ifa->ifa_ifp = ifp; 487 ifa->ifa_rtrequest = link_rtrequest; 488 ifa->ifa_addr = (struct sockaddr *)sdl; 489 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 490 ifa->ifa_netmask = (struct sockaddr *)sdl; 491 sdl->sdl_len = masklen; 492 while (namelen != 0) 493 sdl->sdl_data[--namelen] = 0xff; 494 ifa->ifa_refcnt = 1; 495 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 496 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 497 ifp->if_snd.altq_type = 0; 498 ifp->if_snd.altq_disc = NULL; 499 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 500 ifp->if_snd.altq_tbr = NULL; 501 ifp->if_snd.altq_ifp = ifp; 502 503 IFNET_WLOCK(); 504 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 505 IFNET_WUNLOCK(); 506 507 if (domain_init_status >= 2) 508 if_attachdomain1(ifp); 509 510 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 511 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 512 513 /* Announce the interface. */ 514 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 515 } 516 517 static void 518 if_attachdomain(void *dummy) 519 { 520 struct ifnet *ifp; 521 int s; 522 523 s = splnet(); 524 TAILQ_FOREACH(ifp, &ifnet, if_link) 525 if_attachdomain1(ifp); 526 splx(s); 527 } 528 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 529 if_attachdomain, NULL); 530 531 static void 532 if_attachdomain1(struct ifnet *ifp) 533 { 534 struct domain *dp; 535 int s; 536 537 s = splnet(); 538 539 /* 540 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 541 * cannot lock ifp->if_afdata initialization, entirely. 542 */ 543 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 544 splx(s); 545 return; 546 } 547 if (ifp->if_afdata_initialized >= domain_init_status) { 548 IF_AFDATA_UNLOCK(ifp); 549 splx(s); 550 printf("if_attachdomain called more than once on %s\n", 551 ifp->if_xname); 552 return; 553 } 554 ifp->if_afdata_initialized = domain_init_status; 555 IF_AFDATA_UNLOCK(ifp); 556 557 /* address family dependent data region */ 558 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 559 for (dp = domains; dp; dp = dp->dom_next) { 560 if (dp->dom_ifattach) 561 ifp->if_afdata[dp->dom_family] = 562 (*dp->dom_ifattach)(ifp); 563 } 564 565 splx(s); 566 } 567 568 /* 569 * Remove any network addresses from an interface. 570 */ 571 572 void 573 if_purgeaddrs(struct ifnet *ifp) 574 { 575 struct ifaddr *ifa, *next; 576 577 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 578 579 if (ifa->ifa_addr->sa_family == AF_LINK) 580 continue; 581 #ifdef INET 582 /* XXX: Ugly!! ad hoc just for INET */ 583 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 584 struct ifaliasreq ifr; 585 586 bzero(&ifr, sizeof(ifr)); 587 ifr.ifra_addr = *ifa->ifa_addr; 588 if (ifa->ifa_dstaddr) 589 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 590 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 591 NULL) == 0) 592 continue; 593 } 594 #endif /* INET */ 595 #ifdef INET6 596 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 597 in6_purgeaddr(ifa); 598 /* ifp_addrhead is already updated */ 599 continue; 600 } 601 #endif /* INET6 */ 602 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 603 IFAFREE(ifa); 604 } 605 } 606 607 /* 608 * Detach an interface, removing it from the 609 * list of "active" interfaces and freeing the struct ifnet. 610 * 611 * XXXRW: There are some significant questions about event ordering, and 612 * how to prevent things from starting to use the interface during detach. 613 */ 614 void 615 if_detach(struct ifnet *ifp) 616 { 617 struct ifaddr *ifa; 618 struct radix_node_head *rnh; 619 int s; 620 int i; 621 struct domain *dp; 622 struct ifnet *iter; 623 int found = 0; 624 625 IFNET_WLOCK(); 626 TAILQ_FOREACH(iter, &ifnet, if_link) 627 if (iter == ifp) { 628 TAILQ_REMOVE(&ifnet, ifp, if_link); 629 found = 1; 630 break; 631 } 632 IFNET_WUNLOCK(); 633 if (!found) 634 return; 635 636 /* 637 * Remove/wait for pending events. 638 */ 639 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 640 641 /* 642 * Remove routes and flush queues. 643 */ 644 s = splnet(); 645 if_down(ifp); 646 #ifdef ALTQ 647 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 648 altq_disable(&ifp->if_snd); 649 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 650 altq_detach(&ifp->if_snd); 651 #endif 652 653 if_purgeaddrs(ifp); 654 655 #ifdef INET 656 in_ifdetach(ifp); 657 #endif 658 659 #ifdef INET6 660 /* 661 * Remove all IPv6 kernel structs related to ifp. This should be done 662 * before removing routing entries below, since IPv6 interface direct 663 * routes are expected to be removed by the IPv6-specific kernel API. 664 * Otherwise, the kernel will detect some inconsistency and bark it. 665 */ 666 in6_ifdetach(ifp); 667 #endif 668 /* 669 * Remove address from ifindex_table[] and maybe decrement if_index. 670 * Clean up all addresses. 671 */ 672 ifaddr_byindex(ifp->if_index) = NULL; 673 destroy_dev(ifdev_byindex(ifp->if_index)); 674 ifdev_byindex(ifp->if_index) = NULL; 675 676 /* We can now free link ifaddr. */ 677 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 678 ifa = TAILQ_FIRST(&ifp->if_addrhead); 679 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 680 IFAFREE(ifa); 681 } 682 683 /* 684 * Delete all remaining routes using this interface 685 * Unfortuneatly the only way to do this is to slog through 686 * the entire routing table looking for routes which point 687 * to this interface...oh well... 688 */ 689 for (i = 1; i <= AF_MAX; i++) { 690 if ((rnh = rt_tables[i]) == NULL) 691 continue; 692 RADIX_NODE_HEAD_LOCK(rnh); 693 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 694 RADIX_NODE_HEAD_UNLOCK(rnh); 695 } 696 697 /* Announce that the interface is gone. */ 698 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 699 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 700 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 701 702 IF_AFDATA_LOCK(ifp); 703 for (dp = domains; dp; dp = dp->dom_next) { 704 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 705 (*dp->dom_ifdetach)(ifp, 706 ifp->if_afdata[dp->dom_family]); 707 } 708 IF_AFDATA_UNLOCK(ifp); 709 710 #ifdef MAC 711 mac_destroy_ifnet(ifp); 712 #endif /* MAC */ 713 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 714 knlist_clear(&ifp->if_klist, 0); 715 knlist_destroy(&ifp->if_klist); 716 mtx_destroy(&ifp->if_snd.ifq_mtx); 717 IF_AFDATA_DESTROY(ifp); 718 splx(s); 719 } 720 721 /* 722 * Delete Routes for a Network Interface 723 * 724 * Called for each routing entry via the rnh->rnh_walktree() call above 725 * to delete all route entries referencing a detaching network interface. 726 * 727 * Arguments: 728 * rn pointer to node in the routing table 729 * arg argument passed to rnh->rnh_walktree() - detaching interface 730 * 731 * Returns: 732 * 0 successful 733 * errno failed - reason indicated 734 * 735 */ 736 static int 737 if_rtdel(struct radix_node *rn, void *arg) 738 { 739 struct rtentry *rt = (struct rtentry *)rn; 740 struct ifnet *ifp = arg; 741 int err; 742 743 if (rt->rt_ifp == ifp) { 744 745 /* 746 * Protect (sorta) against walktree recursion problems 747 * with cloned routes 748 */ 749 if ((rt->rt_flags & RTF_UP) == 0) 750 return (0); 751 752 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 753 rt_mask(rt), rt->rt_flags, 754 (struct rtentry **) NULL); 755 if (err) { 756 log(LOG_WARNING, "if_rtdel: error %d\n", err); 757 } 758 } 759 760 return (0); 761 } 762 763 /* 764 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 765 * structs used to represent other address families, it is necessary 766 * to perform a different comparison. 767 */ 768 769 #define sa_equal(a1, a2) \ 770 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 771 772 #define sa_dl_equal(a1, a2) \ 773 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 774 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 775 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 776 LLADDR((struct sockaddr_dl *)(a2)), \ 777 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 778 779 /* 780 * Locate an interface based on a complete address. 781 */ 782 /*ARGSUSED*/ 783 struct ifaddr * 784 ifa_ifwithaddr(struct sockaddr *addr) 785 { 786 struct ifnet *ifp; 787 struct ifaddr *ifa; 788 789 IFNET_RLOCK(); 790 TAILQ_FOREACH(ifp, &ifnet, if_link) 791 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 792 if (ifa->ifa_addr->sa_family != addr->sa_family) 793 continue; 794 if (sa_equal(addr, ifa->ifa_addr)) 795 goto done; 796 /* IP6 doesn't have broadcast */ 797 if ((ifp->if_flags & IFF_BROADCAST) && 798 ifa->ifa_broadaddr && 799 ifa->ifa_broadaddr->sa_len != 0 && 800 sa_equal(ifa->ifa_broadaddr, addr)) 801 goto done; 802 } 803 ifa = NULL; 804 done: 805 IFNET_RUNLOCK(); 806 return (ifa); 807 } 808 809 /* 810 * Locate an interface based on the broadcast address. 811 */ 812 /* ARGSUSED */ 813 struct ifaddr * 814 ifa_ifwithbroadaddr(struct sockaddr *addr) 815 { 816 struct ifnet *ifp; 817 struct ifaddr *ifa; 818 819 IFNET_RLOCK(); 820 TAILQ_FOREACH(ifp, &ifnet, if_link) 821 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 822 if (ifa->ifa_addr->sa_family != addr->sa_family) 823 continue; 824 if ((ifp->if_flags & IFF_BROADCAST) && 825 ifa->ifa_broadaddr && 826 ifa->ifa_broadaddr->sa_len != 0 && 827 sa_equal(ifa->ifa_broadaddr, addr)) 828 goto done; 829 } 830 ifa = NULL; 831 done: 832 IFNET_RUNLOCK(); 833 return (ifa); 834 } 835 836 /* 837 * Locate the point to point interface with a given destination address. 838 */ 839 /*ARGSUSED*/ 840 struct ifaddr * 841 ifa_ifwithdstaddr(struct sockaddr *addr) 842 { 843 struct ifnet *ifp; 844 struct ifaddr *ifa; 845 846 IFNET_RLOCK(); 847 TAILQ_FOREACH(ifp, &ifnet, if_link) { 848 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 849 continue; 850 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 851 if (ifa->ifa_addr->sa_family != addr->sa_family) 852 continue; 853 if (ifa->ifa_dstaddr && 854 sa_equal(addr, ifa->ifa_dstaddr)) 855 goto done; 856 } 857 } 858 ifa = NULL; 859 done: 860 IFNET_RUNLOCK(); 861 return (ifa); 862 } 863 864 /* 865 * Find an interface on a specific network. If many, choice 866 * is most specific found. 867 */ 868 struct ifaddr * 869 ifa_ifwithnet(struct sockaddr *addr) 870 { 871 struct ifnet *ifp; 872 struct ifaddr *ifa; 873 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 874 u_int af = addr->sa_family; 875 char *addr_data = addr->sa_data, *cplim; 876 877 /* 878 * AF_LINK addresses can be looked up directly by their index number, 879 * so do that if we can. 880 */ 881 if (af == AF_LINK) { 882 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 883 if (sdl->sdl_index && sdl->sdl_index <= if_index) 884 return (ifaddr_byindex(sdl->sdl_index)); 885 } 886 887 /* 888 * Scan though each interface, looking for ones that have 889 * addresses in this address family. 890 */ 891 IFNET_RLOCK(); 892 TAILQ_FOREACH(ifp, &ifnet, if_link) { 893 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 894 char *cp, *cp2, *cp3; 895 896 if (ifa->ifa_addr->sa_family != af) 897 next: continue; 898 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 899 /* 900 * This is a bit broken as it doesn't 901 * take into account that the remote end may 902 * be a single node in the network we are 903 * looking for. 904 * The trouble is that we don't know the 905 * netmask for the remote end. 906 */ 907 if (ifa->ifa_dstaddr != 0 && 908 sa_equal(addr, ifa->ifa_dstaddr)) 909 goto done; 910 } else { 911 /* 912 * if we have a special address handler, 913 * then use it instead of the generic one. 914 */ 915 if (ifa->ifa_claim_addr) { 916 if ((*ifa->ifa_claim_addr)(ifa, addr)) 917 goto done; 918 continue; 919 } 920 921 /* 922 * Scan all the bits in the ifa's address. 923 * If a bit dissagrees with what we are 924 * looking for, mask it with the netmask 925 * to see if it really matters. 926 * (A byte at a time) 927 */ 928 if (ifa->ifa_netmask == 0) 929 continue; 930 cp = addr_data; 931 cp2 = ifa->ifa_addr->sa_data; 932 cp3 = ifa->ifa_netmask->sa_data; 933 cplim = ifa->ifa_netmask->sa_len 934 + (char *)ifa->ifa_netmask; 935 while (cp3 < cplim) 936 if ((*cp++ ^ *cp2++) & *cp3++) 937 goto next; /* next address! */ 938 /* 939 * If the netmask of what we just found 940 * is more specific than what we had before 941 * (if we had one) then remember the new one 942 * before continuing to search 943 * for an even better one. 944 */ 945 if (ifa_maybe == 0 || 946 rn_refines((caddr_t)ifa->ifa_netmask, 947 (caddr_t)ifa_maybe->ifa_netmask)) 948 ifa_maybe = ifa; 949 } 950 } 951 } 952 ifa = ifa_maybe; 953 done: 954 IFNET_RUNLOCK(); 955 return (ifa); 956 } 957 958 /* 959 * Find an interface address specific to an interface best matching 960 * a given address. 961 */ 962 struct ifaddr * 963 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 964 { 965 struct ifaddr *ifa; 966 char *cp, *cp2, *cp3; 967 char *cplim; 968 struct ifaddr *ifa_maybe = 0; 969 u_int af = addr->sa_family; 970 971 if (af >= AF_MAX) 972 return (0); 973 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 974 if (ifa->ifa_addr->sa_family != af) 975 continue; 976 if (ifa_maybe == 0) 977 ifa_maybe = ifa; 978 if (ifa->ifa_netmask == 0) { 979 if (sa_equal(addr, ifa->ifa_addr) || 980 (ifa->ifa_dstaddr && 981 sa_equal(addr, ifa->ifa_dstaddr))) 982 goto done; 983 continue; 984 } 985 if (ifp->if_flags & IFF_POINTOPOINT) { 986 if (sa_equal(addr, ifa->ifa_dstaddr)) 987 goto done; 988 } else { 989 cp = addr->sa_data; 990 cp2 = ifa->ifa_addr->sa_data; 991 cp3 = ifa->ifa_netmask->sa_data; 992 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 993 for (; cp3 < cplim; cp3++) 994 if ((*cp++ ^ *cp2++) & *cp3) 995 break; 996 if (cp3 == cplim) 997 goto done; 998 } 999 } 1000 ifa = ifa_maybe; 1001 done: 1002 return (ifa); 1003 } 1004 1005 #include <net/route.h> 1006 1007 /* 1008 * Default action when installing a route with a Link Level gateway. 1009 * Lookup an appropriate real ifa to point to. 1010 * This should be moved to /sys/net/link.c eventually. 1011 */ 1012 static void 1013 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1014 { 1015 struct ifaddr *ifa, *oifa; 1016 struct sockaddr *dst; 1017 struct ifnet *ifp; 1018 1019 RT_LOCK_ASSERT(rt); 1020 1021 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1022 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1023 return; 1024 ifa = ifaof_ifpforaddr(dst, ifp); 1025 if (ifa) { 1026 IFAREF(ifa); /* XXX */ 1027 oifa = rt->rt_ifa; 1028 rt->rt_ifa = ifa; 1029 IFAFREE(oifa); 1030 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1031 ifa->ifa_rtrequest(cmd, rt, info); 1032 } 1033 } 1034 1035 /* 1036 * Mark an interface down and notify protocols of 1037 * the transition. 1038 * NOTE: must be called at splnet or eqivalent. 1039 */ 1040 static void 1041 if_unroute(struct ifnet *ifp, int flag, int fam) 1042 { 1043 struct ifaddr *ifa; 1044 1045 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1046 1047 ifp->if_flags &= ~flag; 1048 getmicrotime(&ifp->if_lastchange); 1049 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1050 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1051 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1052 if_qflush(&ifp->if_snd); 1053 #ifdef DEV_CARP 1054 if (ifp->if_carp) 1055 carp_carpdev_state(ifp->if_carp); 1056 #endif 1057 rt_ifmsg(ifp); 1058 } 1059 1060 /* 1061 * Mark an interface up and notify protocols of 1062 * the transition. 1063 * NOTE: must be called at splnet or eqivalent. 1064 */ 1065 static void 1066 if_route(struct ifnet *ifp, int flag, int fam) 1067 { 1068 struct ifaddr *ifa; 1069 1070 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1071 1072 ifp->if_flags |= flag; 1073 getmicrotime(&ifp->if_lastchange); 1074 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1075 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1076 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1077 #ifdef DEV_CARP 1078 if (ifp->if_carp) 1079 carp_carpdev_state(ifp->if_carp); 1080 #endif 1081 rt_ifmsg(ifp); 1082 #ifdef INET6 1083 in6_if_up(ifp); 1084 #endif 1085 } 1086 1087 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1088 1089 /* 1090 * Handle a change in the interface link state. To avoid LORs 1091 * between driver lock and upper layer locks, as well as possible 1092 * recursions, we post event to taskqueue, and all job 1093 * is done in static do_link_state_change(). 1094 */ 1095 void 1096 if_link_state_change(struct ifnet *ifp, int link_state) 1097 { 1098 /* Return if state hasn't changed. */ 1099 if (ifp->if_link_state == link_state) 1100 return; 1101 1102 ifp->if_link_state = link_state; 1103 1104 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1105 } 1106 1107 static void 1108 do_link_state_change(void *arg, int pending) 1109 { 1110 struct ifnet *ifp = (struct ifnet *)arg; 1111 int link_state = ifp->if_link_state; 1112 int link; 1113 1114 /* Notify that the link state has changed. */ 1115 rt_ifmsg(ifp); 1116 if (link_state == LINK_STATE_UP) 1117 link = NOTE_LINKUP; 1118 else if (link_state == LINK_STATE_DOWN) 1119 link = NOTE_LINKDOWN; 1120 else 1121 link = NOTE_LINKINV; 1122 KNOTE_UNLOCKED(&ifp->if_klist, link); 1123 if (ifp->if_nvlans != 0) 1124 (*vlan_link_state_p)(ifp, link); 1125 1126 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1127 IFP2AC(ifp)->ac_netgraph != NULL) 1128 (*ng_ether_link_state_p)(ifp, link_state); 1129 #ifdef DEV_CARP 1130 if (ifp->if_carp) 1131 carp_carpdev_state(ifp->if_carp); 1132 #endif 1133 if (ifp->if_bridge) { 1134 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1135 (*bstp_linkstate_p)(ifp, link_state); 1136 } 1137 if (ifp->if_lagg) { 1138 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1139 (*lagg_linkstate_p)(ifp, link_state); 1140 } 1141 1142 devctl_notify("IFNET", ifp->if_xname, 1143 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1144 if (pending > 1) 1145 if_printf(ifp, "%d link states coalesced\n", pending); 1146 if (log_link_state_change) 1147 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1148 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1149 } 1150 1151 /* 1152 * Mark an interface down and notify protocols of 1153 * the transition. 1154 * NOTE: must be called at splnet or eqivalent. 1155 */ 1156 void 1157 if_down(struct ifnet *ifp) 1158 { 1159 1160 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1161 } 1162 1163 /* 1164 * Mark an interface up and notify protocols of 1165 * the transition. 1166 * NOTE: must be called at splnet or eqivalent. 1167 */ 1168 void 1169 if_up(struct ifnet *ifp) 1170 { 1171 1172 if_route(ifp, IFF_UP, AF_UNSPEC); 1173 } 1174 1175 /* 1176 * Flush an interface queue. 1177 */ 1178 static void 1179 if_qflush(struct ifaltq *ifq) 1180 { 1181 struct mbuf *m, *n; 1182 1183 IFQ_LOCK(ifq); 1184 #ifdef ALTQ 1185 if (ALTQ_IS_ENABLED(ifq)) 1186 ALTQ_PURGE(ifq); 1187 #endif 1188 n = ifq->ifq_head; 1189 while ((m = n) != 0) { 1190 n = m->m_act; 1191 m_freem(m); 1192 } 1193 ifq->ifq_head = 0; 1194 ifq->ifq_tail = 0; 1195 ifq->ifq_len = 0; 1196 IFQ_UNLOCK(ifq); 1197 } 1198 1199 /* 1200 * Handle interface watchdog timer routines. Called 1201 * from softclock, we decrement timers (if set) and 1202 * call the appropriate interface routine on expiration. 1203 * 1204 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1205 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1206 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1207 */ 1208 static void 1209 if_slowtimo(void *arg) 1210 { 1211 struct ifnet *ifp; 1212 int s = splimp(); 1213 1214 IFNET_RLOCK(); 1215 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1216 if (ifp->if_timer == 0 || --ifp->if_timer) 1217 continue; 1218 if (ifp->if_watchdog) 1219 (*ifp->if_watchdog)(ifp); 1220 } 1221 IFNET_RUNLOCK(); 1222 splx(s); 1223 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1224 } 1225 1226 /* 1227 * Map interface name to 1228 * interface structure pointer. 1229 */ 1230 struct ifnet * 1231 ifunit(const char *name) 1232 { 1233 struct ifnet *ifp; 1234 1235 IFNET_RLOCK(); 1236 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1237 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1238 break; 1239 } 1240 IFNET_RUNLOCK(); 1241 return (ifp); 1242 } 1243 1244 /* 1245 * Hardware specific interface ioctls. 1246 */ 1247 static int 1248 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1249 { 1250 struct ifreq *ifr; 1251 struct ifstat *ifs; 1252 int error = 0; 1253 int new_flags, temp_flags; 1254 size_t namelen, onamelen; 1255 char new_name[IFNAMSIZ]; 1256 struct ifaddr *ifa; 1257 struct sockaddr_dl *sdl; 1258 1259 ifr = (struct ifreq *)data; 1260 switch (cmd) { 1261 case SIOCGIFINDEX: 1262 ifr->ifr_index = ifp->if_index; 1263 break; 1264 1265 case SIOCGIFFLAGS: 1266 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1267 ifr->ifr_flags = temp_flags & 0xffff; 1268 ifr->ifr_flagshigh = temp_flags >> 16; 1269 break; 1270 1271 case SIOCGIFCAP: 1272 ifr->ifr_reqcap = ifp->if_capabilities; 1273 ifr->ifr_curcap = ifp->if_capenable; 1274 break; 1275 1276 #ifdef MAC 1277 case SIOCGIFMAC: 1278 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1279 break; 1280 #endif 1281 1282 case SIOCGIFMETRIC: 1283 ifr->ifr_metric = ifp->if_metric; 1284 break; 1285 1286 case SIOCGIFMTU: 1287 ifr->ifr_mtu = ifp->if_mtu; 1288 break; 1289 1290 case SIOCGIFPHYS: 1291 ifr->ifr_phys = ifp->if_physical; 1292 break; 1293 1294 case SIOCSIFFLAGS: 1295 error = suser(td); 1296 if (error) 1297 return (error); 1298 /* 1299 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1300 * check, so we don't need special handling here yet. 1301 */ 1302 new_flags = (ifr->ifr_flags & 0xffff) | 1303 (ifr->ifr_flagshigh << 16); 1304 if (ifp->if_flags & IFF_SMART) { 1305 /* Smart drivers twiddle their own routes */ 1306 } else if (ifp->if_flags & IFF_UP && 1307 (new_flags & IFF_UP) == 0) { 1308 int s = splimp(); 1309 if_down(ifp); 1310 splx(s); 1311 } else if (new_flags & IFF_UP && 1312 (ifp->if_flags & IFF_UP) == 0) { 1313 int s = splimp(); 1314 if_up(ifp); 1315 splx(s); 1316 } 1317 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1318 (new_flags &~ IFF_CANTCHANGE); 1319 if (new_flags & IFF_PPROMISC) { 1320 /* Permanently promiscuous mode requested */ 1321 ifp->if_flags |= IFF_PROMISC; 1322 } else if (ifp->if_pcount == 0) { 1323 ifp->if_flags &= ~IFF_PROMISC; 1324 } 1325 if (ifp->if_ioctl != NULL) { 1326 IFF_LOCKGIANT(ifp); 1327 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1328 IFF_UNLOCKGIANT(ifp); 1329 } 1330 getmicrotime(&ifp->if_lastchange); 1331 break; 1332 1333 case SIOCSIFCAP: 1334 error = suser(td); 1335 if (error) 1336 return (error); 1337 if (ifp->if_ioctl == NULL) 1338 return (EOPNOTSUPP); 1339 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1340 return (EINVAL); 1341 IFF_LOCKGIANT(ifp); 1342 error = (*ifp->if_ioctl)(ifp, cmd, data); 1343 IFF_UNLOCKGIANT(ifp); 1344 if (error == 0) 1345 getmicrotime(&ifp->if_lastchange); 1346 break; 1347 1348 #ifdef MAC 1349 case SIOCSIFMAC: 1350 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1351 break; 1352 #endif 1353 1354 case SIOCSIFNAME: 1355 error = suser(td); 1356 if (error != 0) 1357 return (error); 1358 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1359 if (error != 0) 1360 return (error); 1361 if (new_name[0] == '\0') 1362 return (EINVAL); 1363 if (ifunit(new_name) != NULL) 1364 return (EEXIST); 1365 1366 /* Announce the departure of the interface. */ 1367 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1368 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1369 1370 log(LOG_INFO, "%s: changing name to '%s'\n", 1371 ifp->if_xname, new_name); 1372 1373 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1374 ifa = ifaddr_byindex(ifp->if_index); 1375 IFA_LOCK(ifa); 1376 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1377 namelen = strlen(new_name); 1378 onamelen = sdl->sdl_nlen; 1379 /* 1380 * Move the address if needed. This is safe because we 1381 * allocate space for a name of length IFNAMSIZ when we 1382 * create this in if_attach(). 1383 */ 1384 if (namelen != onamelen) { 1385 bcopy(sdl->sdl_data + onamelen, 1386 sdl->sdl_data + namelen, sdl->sdl_alen); 1387 } 1388 bcopy(new_name, sdl->sdl_data, namelen); 1389 sdl->sdl_nlen = namelen; 1390 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1391 bzero(sdl->sdl_data, onamelen); 1392 while (namelen != 0) 1393 sdl->sdl_data[--namelen] = 0xff; 1394 IFA_UNLOCK(ifa); 1395 1396 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1397 /* Announce the return of the interface. */ 1398 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1399 break; 1400 1401 case SIOCSIFMETRIC: 1402 error = suser(td); 1403 if (error) 1404 return (error); 1405 ifp->if_metric = ifr->ifr_metric; 1406 getmicrotime(&ifp->if_lastchange); 1407 break; 1408 1409 case SIOCSIFPHYS: 1410 error = suser(td); 1411 if (error) 1412 return (error); 1413 if (ifp->if_ioctl == NULL) 1414 return (EOPNOTSUPP); 1415 IFF_LOCKGIANT(ifp); 1416 error = (*ifp->if_ioctl)(ifp, cmd, data); 1417 IFF_UNLOCKGIANT(ifp); 1418 if (error == 0) 1419 getmicrotime(&ifp->if_lastchange); 1420 break; 1421 1422 case SIOCSIFMTU: 1423 { 1424 u_long oldmtu = ifp->if_mtu; 1425 1426 error = suser(td); 1427 if (error) 1428 return (error); 1429 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1430 return (EINVAL); 1431 if (ifp->if_ioctl == NULL) 1432 return (EOPNOTSUPP); 1433 IFF_LOCKGIANT(ifp); 1434 error = (*ifp->if_ioctl)(ifp, cmd, data); 1435 IFF_UNLOCKGIANT(ifp); 1436 if (error == 0) { 1437 getmicrotime(&ifp->if_lastchange); 1438 rt_ifmsg(ifp); 1439 } 1440 /* 1441 * If the link MTU changed, do network layer specific procedure. 1442 */ 1443 if (ifp->if_mtu != oldmtu) { 1444 #ifdef INET6 1445 nd6_setmtu(ifp); 1446 #endif 1447 } 1448 break; 1449 } 1450 1451 case SIOCADDMULTI: 1452 case SIOCDELMULTI: 1453 error = suser(td); 1454 if (error) 1455 return (error); 1456 1457 /* Don't allow group membership on non-multicast interfaces. */ 1458 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1459 return (EOPNOTSUPP); 1460 1461 /* Don't let users screw up protocols' entries. */ 1462 if (ifr->ifr_addr.sa_family != AF_LINK) 1463 return (EINVAL); 1464 1465 if (cmd == SIOCADDMULTI) { 1466 struct ifmultiaddr *ifma; 1467 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1468 } else { 1469 error = if_delmulti(ifp, &ifr->ifr_addr); 1470 } 1471 if (error == 0) 1472 getmicrotime(&ifp->if_lastchange); 1473 break; 1474 1475 case SIOCSIFPHYADDR: 1476 case SIOCDIFPHYADDR: 1477 #ifdef INET6 1478 case SIOCSIFPHYADDR_IN6: 1479 #endif 1480 case SIOCSLIFPHYADDR: 1481 case SIOCSIFMEDIA: 1482 case SIOCSIFGENERIC: 1483 error = suser(td); 1484 if (error) 1485 return (error); 1486 if (ifp->if_ioctl == NULL) 1487 return (EOPNOTSUPP); 1488 IFF_LOCKGIANT(ifp); 1489 error = (*ifp->if_ioctl)(ifp, cmd, data); 1490 IFF_UNLOCKGIANT(ifp); 1491 if (error == 0) 1492 getmicrotime(&ifp->if_lastchange); 1493 break; 1494 1495 case SIOCGIFSTATUS: 1496 ifs = (struct ifstat *)data; 1497 ifs->ascii[0] = '\0'; 1498 1499 case SIOCGIFPSRCADDR: 1500 case SIOCGIFPDSTADDR: 1501 case SIOCGLIFPHYADDR: 1502 case SIOCGIFMEDIA: 1503 case SIOCGIFGENERIC: 1504 if (ifp->if_ioctl == NULL) 1505 return (EOPNOTSUPP); 1506 IFF_LOCKGIANT(ifp); 1507 error = (*ifp->if_ioctl)(ifp, cmd, data); 1508 IFF_UNLOCKGIANT(ifp); 1509 break; 1510 1511 case SIOCSIFLLADDR: 1512 error = suser(td); 1513 if (error) 1514 return (error); 1515 error = if_setlladdr(ifp, 1516 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1517 break; 1518 1519 default: 1520 error = ENOIOCTL; 1521 break; 1522 } 1523 return (error); 1524 } 1525 1526 /* 1527 * Interface ioctls. 1528 */ 1529 int 1530 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1531 { 1532 struct ifnet *ifp; 1533 struct ifreq *ifr; 1534 int error; 1535 int oif_flags; 1536 1537 switch (cmd) { 1538 case SIOCGIFCONF: 1539 case OSIOCGIFCONF: 1540 #ifdef __amd64__ 1541 case SIOCGIFCONF32: 1542 #endif 1543 return (ifconf(cmd, data)); 1544 } 1545 ifr = (struct ifreq *)data; 1546 1547 switch (cmd) { 1548 case SIOCIFCREATE: 1549 case SIOCIFDESTROY: 1550 if ((error = suser(td)) != 0) 1551 return (error); 1552 return ((cmd == SIOCIFCREATE) ? 1553 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1554 if_clone_destroy(ifr->ifr_name)); 1555 1556 case SIOCIFGCLONERS: 1557 return (if_clone_list((struct if_clonereq *)data)); 1558 } 1559 1560 ifp = ifunit(ifr->ifr_name); 1561 if (ifp == 0) 1562 return (ENXIO); 1563 1564 error = ifhwioctl(cmd, ifp, data, td); 1565 if (error != ENOIOCTL) 1566 return (error); 1567 1568 oif_flags = ifp->if_flags; 1569 if (so->so_proto == 0) 1570 return (EOPNOTSUPP); 1571 #ifndef COMPAT_43 1572 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1573 data, 1574 ifp, td)); 1575 #else 1576 { 1577 int ocmd = cmd; 1578 1579 switch (cmd) { 1580 1581 case SIOCSIFDSTADDR: 1582 case SIOCSIFADDR: 1583 case SIOCSIFBRDADDR: 1584 case SIOCSIFNETMASK: 1585 #if BYTE_ORDER != BIG_ENDIAN 1586 if (ifr->ifr_addr.sa_family == 0 && 1587 ifr->ifr_addr.sa_len < 16) { 1588 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1589 ifr->ifr_addr.sa_len = 16; 1590 } 1591 #else 1592 if (ifr->ifr_addr.sa_len == 0) 1593 ifr->ifr_addr.sa_len = 16; 1594 #endif 1595 break; 1596 1597 case OSIOCGIFADDR: 1598 cmd = SIOCGIFADDR; 1599 break; 1600 1601 case OSIOCGIFDSTADDR: 1602 cmd = SIOCGIFDSTADDR; 1603 break; 1604 1605 case OSIOCGIFBRDADDR: 1606 cmd = SIOCGIFBRDADDR; 1607 break; 1608 1609 case OSIOCGIFNETMASK: 1610 cmd = SIOCGIFNETMASK; 1611 } 1612 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1613 cmd, 1614 data, 1615 ifp, td)); 1616 switch (ocmd) { 1617 1618 case OSIOCGIFADDR: 1619 case OSIOCGIFDSTADDR: 1620 case OSIOCGIFBRDADDR: 1621 case OSIOCGIFNETMASK: 1622 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1623 1624 } 1625 } 1626 #endif /* COMPAT_43 */ 1627 1628 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1629 #ifdef INET6 1630 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1631 if (ifp->if_flags & IFF_UP) { 1632 int s = splimp(); 1633 in6_if_up(ifp); 1634 splx(s); 1635 } 1636 #endif 1637 } 1638 return (error); 1639 } 1640 1641 /* 1642 * The code common to handling reference counted flags, 1643 * e.g., in ifpromisc() and if_allmulti(). 1644 * The "pflag" argument can specify a permanent mode flag, 1645 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 1646 * 1647 * Only to be used on stack-owned flags, not driver-owned flags. 1648 */ 1649 static int 1650 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 1651 { 1652 struct ifreq ifr; 1653 int error; 1654 int oldflags, oldcount; 1655 1656 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 1657 ("if_setflag: setting driver-ownded flag %d", flag)); 1658 1659 /* Sanity checks to catch programming errors */ 1660 if (onswitch) { 1661 if (*refcount < 0) { 1662 if_printf(ifp, 1663 "refusing to increment negative refcount %d " 1664 "for interface flag %d\n", *refcount, flag); 1665 return (EINVAL); 1666 } 1667 } else { 1668 if (*refcount <= 0) { 1669 if_printf(ifp, 1670 "refusing to decrement non-positive refcount %d" 1671 "for interface flag %d\n", *refcount, flag); 1672 return (EINVAL); 1673 } 1674 } 1675 1676 /* In case this mode is permanent, just touch refcount */ 1677 if (ifp->if_flags & pflag) { 1678 *refcount += onswitch ? 1 : -1; 1679 return (0); 1680 } 1681 1682 /* Save ifnet parameters for if_ioctl() may fail */ 1683 oldcount = *refcount; 1684 oldflags = ifp->if_flags; 1685 1686 /* 1687 * See if we aren't the only and touching refcount is enough. 1688 * Actually toggle interface flag if we are the first or last. 1689 */ 1690 if (onswitch) { 1691 if ((*refcount)++) 1692 return (0); 1693 ifp->if_flags |= flag; 1694 } else { 1695 if (--(*refcount)) 1696 return (0); 1697 ifp->if_flags &= ~flag; 1698 } 1699 1700 /* Call down the driver since we've changed interface flags */ 1701 if (ifp->if_ioctl == NULL) { 1702 error = EOPNOTSUPP; 1703 goto recover; 1704 } 1705 ifr.ifr_flags = ifp->if_flags & 0xffff; 1706 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1707 IFF_LOCKGIANT(ifp); 1708 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1709 IFF_UNLOCKGIANT(ifp); 1710 if (error) 1711 goto recover; 1712 /* Notify userland that interface flags have changed */ 1713 rt_ifmsg(ifp); 1714 return (0); 1715 1716 recover: 1717 /* Recover after driver error */ 1718 *refcount = oldcount; 1719 ifp->if_flags = oldflags; 1720 return (error); 1721 } 1722 1723 /* 1724 * Set/clear promiscuous mode on interface ifp based on the truth value 1725 * of pswitch. The calls are reference counted so that only the first 1726 * "on" request actually has an effect, as does the final "off" request. 1727 * Results are undefined if the "off" and "on" requests are not matched. 1728 */ 1729 int 1730 ifpromisc(struct ifnet *ifp, int pswitch) 1731 { 1732 int error; 1733 int oldflags = ifp->if_flags; 1734 1735 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 1736 &ifp->if_pcount, pswitch); 1737 /* If promiscuous mode status has changed, log a message */ 1738 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 1739 log(LOG_INFO, "%s: promiscuous mode %s\n", 1740 ifp->if_xname, 1741 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1742 return (error); 1743 } 1744 1745 /* 1746 * Return interface configuration 1747 * of system. List may be used 1748 * in later ioctl's (above) to get 1749 * other information. 1750 */ 1751 /*ARGSUSED*/ 1752 static int 1753 ifconf(u_long cmd, caddr_t data) 1754 { 1755 struct ifconf *ifc = (struct ifconf *)data; 1756 #ifdef __amd64__ 1757 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 1758 struct ifconf ifc_swab; 1759 #endif 1760 struct ifnet *ifp; 1761 struct ifaddr *ifa; 1762 struct ifreq ifr; 1763 struct sbuf *sb; 1764 int error, full = 0, valid_len, max_len; 1765 1766 #ifdef __amd64__ 1767 if (cmd == SIOCGIFCONF32) { 1768 ifc_swab.ifc_len = ifc32->ifc_len; 1769 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 1770 ifc = &ifc_swab; 1771 } 1772 #endif 1773 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 1774 max_len = MAXPHYS - 1; 1775 1776 /* Prevent hostile input from being able to crash the system */ 1777 if (ifc->ifc_len <= 0) 1778 return (EINVAL); 1779 1780 again: 1781 if (ifc->ifc_len <= max_len) { 1782 max_len = ifc->ifc_len; 1783 full = 1; 1784 } 1785 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 1786 max_len = 0; 1787 valid_len = 0; 1788 1789 IFNET_RLOCK(); /* could sleep XXX */ 1790 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1791 int addrs; 1792 1793 /* 1794 * Zero the ifr_name buffer to make sure we don't 1795 * disclose the contents of the stack. 1796 */ 1797 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 1798 1799 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1800 >= sizeof(ifr.ifr_name)) { 1801 sbuf_delete(sb); 1802 IFNET_RUNLOCK(); 1803 return (ENAMETOOLONG); 1804 } 1805 1806 addrs = 0; 1807 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1808 struct sockaddr *sa = ifa->ifa_addr; 1809 1810 if (jailed(curthread->td_ucred) && 1811 prison_if(curthread->td_ucred, sa)) 1812 continue; 1813 addrs++; 1814 #ifdef COMPAT_43 1815 if (cmd == OSIOCGIFCONF) { 1816 struct osockaddr *osa = 1817 (struct osockaddr *)&ifr.ifr_addr; 1818 ifr.ifr_addr = *sa; 1819 osa->sa_family = sa->sa_family; 1820 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1821 max_len += sizeof(ifr); 1822 } else 1823 #endif 1824 if (sa->sa_len <= sizeof(*sa)) { 1825 ifr.ifr_addr = *sa; 1826 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1827 max_len += sizeof(ifr); 1828 } else { 1829 sbuf_bcat(sb, &ifr, 1830 offsetof(struct ifreq, ifr_addr)); 1831 max_len += offsetof(struct ifreq, ifr_addr); 1832 sbuf_bcat(sb, sa, sa->sa_len); 1833 max_len += sa->sa_len; 1834 } 1835 1836 if (!sbuf_overflowed(sb)) 1837 valid_len = sbuf_len(sb); 1838 } 1839 if (addrs == 0) { 1840 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1841 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1842 max_len += sizeof(ifr); 1843 1844 if (!sbuf_overflowed(sb)) 1845 valid_len = sbuf_len(sb); 1846 } 1847 } 1848 IFNET_RUNLOCK(); 1849 1850 /* 1851 * If we didn't allocate enough space (uncommon), try again. If 1852 * we have already allocated as much space as we are allowed, 1853 * return what we've got. 1854 */ 1855 if (valid_len != max_len && !full) { 1856 sbuf_delete(sb); 1857 goto again; 1858 } 1859 1860 ifc->ifc_len = valid_len; 1861 #ifdef __amd64__ 1862 if (cmd == SIOCGIFCONF32) 1863 ifc32->ifc_len = valid_len; 1864 #endif 1865 sbuf_finish(sb); 1866 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 1867 sbuf_delete(sb); 1868 return (error); 1869 } 1870 1871 /* 1872 * Just like ifpromisc(), but for all-multicast-reception mode. 1873 */ 1874 int 1875 if_allmulti(struct ifnet *ifp, int onswitch) 1876 { 1877 1878 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 1879 } 1880 1881 static struct ifmultiaddr * 1882 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 1883 { 1884 struct ifmultiaddr *ifma; 1885 1886 IF_ADDR_LOCK_ASSERT(ifp); 1887 1888 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1889 if (sa->sa_family == AF_LINK) { 1890 if (sa_dl_equal(ifma->ifma_addr, sa)) 1891 break; 1892 } else { 1893 if (sa_equal(ifma->ifma_addr, sa)) 1894 break; 1895 } 1896 } 1897 1898 return ifma; 1899 } 1900 1901 /* 1902 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 1903 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 1904 * the ifnet multicast address list here, so the caller must do that and 1905 * other setup work (such as notifying the device driver). The reference 1906 * count is initialized to 1. 1907 */ 1908 static struct ifmultiaddr * 1909 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 1910 int mflags) 1911 { 1912 struct ifmultiaddr *ifma; 1913 struct sockaddr *dupsa; 1914 1915 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags | 1916 M_ZERO); 1917 if (ifma == NULL) 1918 return (NULL); 1919 1920 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags); 1921 if (dupsa == NULL) { 1922 FREE(ifma, M_IFMADDR); 1923 return (NULL); 1924 } 1925 bcopy(sa, dupsa, sa->sa_len); 1926 ifma->ifma_addr = dupsa; 1927 1928 ifma->ifma_ifp = ifp; 1929 ifma->ifma_refcount = 1; 1930 ifma->ifma_protospec = NULL; 1931 1932 if (llsa == NULL) { 1933 ifma->ifma_lladdr = NULL; 1934 return (ifma); 1935 } 1936 1937 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags); 1938 if (dupsa == NULL) { 1939 FREE(ifma->ifma_addr, M_IFMADDR); 1940 FREE(ifma, M_IFMADDR); 1941 return (NULL); 1942 } 1943 bcopy(llsa, dupsa, llsa->sa_len); 1944 ifma->ifma_lladdr = dupsa; 1945 1946 return (ifma); 1947 } 1948 1949 /* 1950 * if_freemulti: free ifmultiaddr structure and possibly attached related 1951 * addresses. The caller is responsible for implementing reference 1952 * counting, notifying the driver, handling routing messages, and releasing 1953 * any dependent link layer state. 1954 */ 1955 static void 1956 if_freemulti(struct ifmultiaddr *ifma) 1957 { 1958 1959 KASSERT(ifma->ifma_refcount == 1, ("if_freemulti: refcount %d", 1960 ifma->ifma_refcount)); 1961 KASSERT(ifma->ifma_protospec == NULL, 1962 ("if_freemulti: protospec not NULL")); 1963 1964 if (ifma->ifma_lladdr != NULL) 1965 FREE(ifma->ifma_lladdr, M_IFMADDR); 1966 FREE(ifma->ifma_addr, M_IFMADDR); 1967 FREE(ifma, M_IFMADDR); 1968 } 1969 1970 /* 1971 * Register an additional multicast address with a network interface. 1972 * 1973 * - If the address is already present, bump the reference count on the 1974 * address and return. 1975 * - If the address is not link-layer, look up a link layer address. 1976 * - Allocate address structures for one or both addresses, and attach to the 1977 * multicast address list on the interface. If automatically adding a link 1978 * layer address, the protocol address will own a reference to the link 1979 * layer address, to be freed when it is freed. 1980 * - Notify the network device driver of an addition to the multicast address 1981 * list. 1982 * 1983 * 'sa' points to caller-owned memory with the desired multicast address. 1984 * 1985 * 'retifma' will be used to return a pointer to the resulting multicast 1986 * address reference, if desired. 1987 */ 1988 int 1989 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 1990 struct ifmultiaddr **retifma) 1991 { 1992 struct ifmultiaddr *ifma, *ll_ifma; 1993 struct sockaddr *llsa; 1994 int error; 1995 1996 /* 1997 * If the address is already present, return a new reference to it; 1998 * otherwise, allocate storage and set up a new address. 1999 */ 2000 IF_ADDR_LOCK(ifp); 2001 ifma = if_findmulti(ifp, sa); 2002 if (ifma != NULL) { 2003 ifma->ifma_refcount++; 2004 if (retifma != NULL) 2005 *retifma = ifma; 2006 IF_ADDR_UNLOCK(ifp); 2007 return (0); 2008 } 2009 2010 /* 2011 * The address isn't already present; resolve the protocol address 2012 * into a link layer address, and then look that up, bump its 2013 * refcount or allocate an ifma for that also. If 'llsa' was 2014 * returned, we will need to free it later. 2015 */ 2016 llsa = NULL; 2017 ll_ifma = NULL; 2018 if (ifp->if_resolvemulti != NULL) { 2019 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2020 if (error) 2021 goto unlock_out; 2022 } 2023 2024 /* 2025 * Allocate the new address. Don't hook it up yet, as we may also 2026 * need to allocate a link layer multicast address. 2027 */ 2028 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2029 if (ifma == NULL) { 2030 error = ENOMEM; 2031 goto free_llsa_out; 2032 } 2033 2034 /* 2035 * If a link layer address is found, we'll need to see if it's 2036 * already present in the address list, or allocate is as well. 2037 * When this block finishes, the link layer address will be on the 2038 * list. 2039 */ 2040 if (llsa != NULL) { 2041 ll_ifma = if_findmulti(ifp, llsa); 2042 if (ll_ifma == NULL) { 2043 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2044 if (ll_ifma == NULL) { 2045 if_freemulti(ifma); 2046 error = ENOMEM; 2047 goto free_llsa_out; 2048 } 2049 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2050 ifma_link); 2051 } else 2052 ll_ifma->ifma_refcount++; 2053 } 2054 2055 /* 2056 * We now have a new multicast address, ifma, and possibly a new or 2057 * referenced link layer address. Add the primary address to the 2058 * ifnet address list. 2059 */ 2060 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2061 2062 if (retifma != NULL) 2063 *retifma = ifma; 2064 2065 /* 2066 * Must generate the message while holding the lock so that 'ifma' 2067 * pointer is still valid. 2068 * 2069 * XXXRW: How come we don't announce ll_ifma? 2070 */ 2071 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2072 IF_ADDR_UNLOCK(ifp); 2073 2074 /* 2075 * We are certain we have added something, so call down to the 2076 * interface to let them know about it. 2077 */ 2078 if (ifp->if_ioctl != NULL) { 2079 IFF_LOCKGIANT(ifp); 2080 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2081 IFF_UNLOCKGIANT(ifp); 2082 } 2083 2084 if (llsa != NULL) 2085 FREE(llsa, M_IFMADDR); 2086 2087 return (0); 2088 2089 free_llsa_out: 2090 if (llsa != NULL) 2091 FREE(llsa, M_IFMADDR); 2092 2093 unlock_out: 2094 IF_ADDR_UNLOCK(ifp); 2095 return (error); 2096 } 2097 2098 /* 2099 * Remove a reference to a multicast address on this interface. Yell 2100 * if the request does not match an existing membership. ifma->ifma_ifp 2101 * must be locked on entry and will be unlocked on return. 2102 */ 2103 static int 2104 if_delmulti_locked(struct ifmultiaddr *ifma) 2105 { 2106 struct ifmultiaddr *ll_ifma; 2107 struct sockaddr *sa; 2108 struct ifnet *ifp; 2109 2110 ifp = ifma->ifma_ifp; 2111 if (ifma->ifma_refcount > 1) { 2112 ifma->ifma_refcount--; 2113 IF_ADDR_UNLOCK(ifp); 2114 return 0; 2115 } 2116 2117 sa = ifma->ifma_lladdr; 2118 if (sa != NULL) 2119 ll_ifma = if_findmulti(ifp, sa); 2120 else 2121 ll_ifma = NULL; 2122 2123 /* 2124 * XXXRW: How come we don't announce ll_ifma? 2125 */ 2126 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2127 2128 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2129 if_freemulti(ifma); 2130 2131 if (ll_ifma != NULL) { 2132 if (ll_ifma->ifma_refcount == 1) { 2133 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifma_link); 2134 if_freemulti(ll_ifma); 2135 } else 2136 ll_ifma->ifma_refcount--; 2137 } 2138 IF_ADDR_UNLOCK(ifp); 2139 2140 /* 2141 * Make sure the interface driver is notified 2142 * in the case of a link layer mcast group being left. 2143 */ 2144 if (ifp->if_ioctl) { 2145 IFF_LOCKGIANT(ifp); 2146 (void) (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2147 IFF_UNLOCKGIANT(ifp); 2148 } 2149 2150 return 0; 2151 } 2152 2153 int 2154 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2155 { 2156 struct ifmultiaddr *ifma; 2157 int error; 2158 2159 IF_ADDR_LOCK(ifp); 2160 if ((ifma = if_findmulti(ifp, sa)) == NULL) { 2161 IF_ADDR_UNLOCK(ifp); 2162 error = ENOENT; 2163 } else 2164 error = if_delmulti_locked(ifma); /* Drops the lock */ 2165 2166 return (error); 2167 } 2168 2169 int 2170 if_delmulti_ent(struct ifmultiaddr *ifma) 2171 { 2172 2173 IF_ADDR_LOCK(ifma->ifma_ifp); 2174 return (if_delmulti_locked(ifma)); /* Drops the lock */ 2175 } 2176 2177 /* 2178 * Set the link layer address on an interface. 2179 * 2180 * At this time we only support certain types of interfaces, 2181 * and we don't allow the length of the address to change. 2182 */ 2183 int 2184 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2185 { 2186 struct sockaddr_dl *sdl; 2187 struct ifaddr *ifa; 2188 struct ifreq ifr; 2189 2190 ifa = ifaddr_byindex(ifp->if_index); 2191 if (ifa == NULL) 2192 return (EINVAL); 2193 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2194 if (sdl == NULL) 2195 return (EINVAL); 2196 if (len != sdl->sdl_alen) /* don't allow length to change */ 2197 return (EINVAL); 2198 switch (ifp->if_type) { 2199 case IFT_ETHER: /* these types use struct arpcom */ 2200 case IFT_FDDI: 2201 case IFT_XETHER: 2202 case IFT_ISO88025: 2203 case IFT_L2VLAN: 2204 case IFT_BRIDGE: 2205 case IFT_IEEE8023ADLAG: 2206 bcopy(lladdr, IFP2ENADDR(ifp), len); 2207 /* 2208 * XXX We also need to store the lladdr in LLADDR(sdl), 2209 * which is done below. This is a pain because we must 2210 * remember to keep the info in sync. 2211 */ 2212 /* FALLTHROUGH */ 2213 case IFT_ARCNET: 2214 bcopy(lladdr, LLADDR(sdl), len); 2215 break; 2216 default: 2217 return (ENODEV); 2218 } 2219 /* 2220 * If the interface is already up, we need 2221 * to re-init it in order to reprogram its 2222 * address filter. 2223 */ 2224 if ((ifp->if_flags & IFF_UP) != 0) { 2225 if (ifp->if_ioctl) { 2226 IFF_LOCKGIANT(ifp); 2227 ifp->if_flags &= ~IFF_UP; 2228 ifr.ifr_flags = ifp->if_flags & 0xffff; 2229 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2230 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2231 ifp->if_flags |= IFF_UP; 2232 ifr.ifr_flags = ifp->if_flags & 0xffff; 2233 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2234 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2235 IFF_UNLOCKGIANT(ifp); 2236 } 2237 #ifdef INET 2238 /* 2239 * Also send gratuitous ARPs to notify other nodes about 2240 * the address change. 2241 */ 2242 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2243 if (ifa->ifa_addr != NULL && 2244 ifa->ifa_addr->sa_family == AF_INET) 2245 arp_ifinit(ifp, ifa); 2246 } 2247 #endif 2248 } 2249 return (0); 2250 } 2251 2252 /* 2253 * The name argument must be a pointer to storage which will last as 2254 * long as the interface does. For physical devices, the result of 2255 * device_get_name(dev) is a good choice and for pseudo-devices a 2256 * static string works well. 2257 */ 2258 void 2259 if_initname(struct ifnet *ifp, const char *name, int unit) 2260 { 2261 ifp->if_dname = name; 2262 ifp->if_dunit = unit; 2263 if (unit != IF_DUNIT_NONE) 2264 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2265 else 2266 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2267 } 2268 2269 int 2270 if_printf(struct ifnet *ifp, const char * fmt, ...) 2271 { 2272 va_list ap; 2273 int retval; 2274 2275 retval = printf("%s: ", ifp->if_xname); 2276 va_start(ap, fmt); 2277 retval += vprintf(fmt, ap); 2278 va_end(ap); 2279 return (retval); 2280 } 2281 2282 /* 2283 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 2284 * be called without Giant. However, we often can't acquire the Giant lock 2285 * at those points; instead, we run it via a task queue that holds Giant via 2286 * if_start_deferred. 2287 * 2288 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 2289 * outstanding if_start_deferred() tasks that will run after the free. This 2290 * probably means waiting in if_detach(). 2291 */ 2292 void 2293 if_start(struct ifnet *ifp) 2294 { 2295 2296 NET_ASSERT_GIANT(); 2297 2298 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 2299 if (mtx_owned(&Giant)) 2300 (*(ifp)->if_start)(ifp); 2301 else 2302 taskqueue_enqueue(taskqueue_swi_giant, 2303 &ifp->if_starttask); 2304 } else 2305 (*(ifp)->if_start)(ifp); 2306 } 2307 2308 static void 2309 if_start_deferred(void *context, int pending) 2310 { 2311 struct ifnet *ifp; 2312 2313 /* 2314 * This code must be entered with Giant, and should never run if 2315 * we're not running with debug.mpsafenet. 2316 */ 2317 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 2318 GIANT_REQUIRED; 2319 2320 ifp = context; 2321 (ifp->if_start)(ifp); 2322 } 2323 2324 int 2325 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2326 { 2327 int active = 0; 2328 2329 IF_LOCK(ifq); 2330 if (_IF_QFULL(ifq)) { 2331 _IF_DROP(ifq); 2332 IF_UNLOCK(ifq); 2333 m_freem(m); 2334 return (0); 2335 } 2336 if (ifp != NULL) { 2337 ifp->if_obytes += m->m_pkthdr.len + adjust; 2338 if (m->m_flags & (M_BCAST|M_MCAST)) 2339 ifp->if_omcasts++; 2340 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2341 } 2342 _IF_ENQUEUE(ifq, m); 2343 IF_UNLOCK(ifq); 2344 if (ifp != NULL && !active) 2345 if_start(ifp); 2346 return (1); 2347 } 2348 2349 void 2350 if_register_com_alloc(u_char type, 2351 if_com_alloc_t *a, if_com_free_t *f) 2352 { 2353 2354 KASSERT(if_com_alloc[type] == NULL, 2355 ("if_register_com_alloc: %d already registered", type)); 2356 KASSERT(if_com_free[type] == NULL, 2357 ("if_register_com_alloc: %d free already registered", type)); 2358 2359 if_com_alloc[type] = a; 2360 if_com_free[type] = f; 2361 } 2362 2363 void 2364 if_deregister_com_alloc(u_char type) 2365 { 2366 2367 KASSERT(if_com_alloc[type] == NULL, 2368 ("if_deregister_com_alloc: %d not registered", type)); 2369 KASSERT(if_com_free[type] == NULL, 2370 ("if_deregister_com_alloc: %d free not registered", type)); 2371 if_com_alloc[type] = NULL; 2372 if_com_free[type] = NULL; 2373 }
Cache object: c993e6121e04e81da4aa46f42749aca1
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