1 /*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD$ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 #include "opt_mac.h" 37 #include "opt_carp.h" 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <sys/conf.h> 42 #include <sys/mac.h> 43 #include <sys/malloc.h> 44 #include <sys/sbuf.h> 45 #include <sys/bus.h> 46 #include <sys/mbuf.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/sockio.h> 54 #include <sys/syslog.h> 55 #include <sys/sysctl.h> 56 #include <sys/taskqueue.h> 57 #include <sys/domain.h> 58 #include <sys/jail.h> 59 #include <machine/stdarg.h> 60 61 #include <net/if.h> 62 #include <net/if_clone.h> 63 #include <net/if_dl.h> 64 #include <net/if_types.h> 65 #include <net/if_var.h> 66 #include <net/radix.h> 67 #include <net/route.h> 68 69 #if defined(INET) || defined(INET6) 70 /*XXX*/ 71 #include <netinet/in.h> 72 #include <netinet/in_var.h> 73 #ifdef INET6 74 #include <netinet6/in6_var.h> 75 #include <netinet6/in6_ifattach.h> 76 #endif 77 #endif 78 #ifdef INET 79 #include <netinet/if_ether.h> 80 #endif 81 #ifdef DEV_CARP 82 #include <netinet/ip_carp.h> 83 #endif 84 85 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 86 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 87 88 /* Log link state change events */ 89 static int log_link_state_change = 1; 90 91 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 92 &log_link_state_change, 0, 93 "log interface link state change events"); 94 95 void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 96 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 97 98 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 99 100 static void if_attachdomain(void *); 101 static void if_attachdomain1(struct ifnet *); 102 static int ifconf(u_long, caddr_t); 103 static void if_grow(void); 104 static void if_init(void *); 105 static void if_check(void *); 106 static void if_qflush(struct ifaltq *); 107 static void if_route(struct ifnet *, int flag, int fam); 108 static int if_setflag(struct ifnet *, int, int, int *, int); 109 static void if_slowtimo(void *); 110 static void if_unroute(struct ifnet *, int flag, int fam); 111 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 112 static int if_rtdel(struct radix_node *, void *); 113 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 114 static void if_start_deferred(void *context, int pending); 115 static void do_link_state_change(void *, int); 116 #ifdef INET6 117 /* 118 * XXX: declare here to avoid to include many inet6 related files.. 119 * should be more generalized? 120 */ 121 extern void nd6_setmtu(struct ifnet *); 122 #endif 123 124 int if_index = 0; 125 struct ifindex_entry *ifindex_table = NULL; 126 int ifqmaxlen = IFQ_MAXLEN; 127 struct ifnethead ifnet; /* depend on static init XXX */ 128 struct mtx ifnet_lock; 129 static if_com_alloc_t *if_com_alloc[256]; 130 static if_com_free_t *if_com_free[256]; 131 132 static int if_indexlim = 8; 133 static struct knlist ifklist; 134 135 static void filt_netdetach(struct knote *kn); 136 static int filt_netdev(struct knote *kn, long hint); 137 138 static struct filterops netdev_filtops = 139 { 1, NULL, filt_netdetach, filt_netdev }; 140 141 /* 142 * System initialization 143 */ 144 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 145 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 146 147 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 148 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 149 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 150 151 static d_open_t netopen; 152 static d_close_t netclose; 153 static d_ioctl_t netioctl; 154 static d_kqfilter_t netkqfilter; 155 156 static struct cdevsw net_cdevsw = { 157 .d_version = D_VERSION, 158 .d_flags = D_NEEDGIANT, 159 .d_open = netopen, 160 .d_close = netclose, 161 .d_ioctl = netioctl, 162 .d_name = "net", 163 .d_kqfilter = netkqfilter, 164 }; 165 166 static int 167 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 168 { 169 return (0); 170 } 171 172 static int 173 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 174 { 175 return (0); 176 } 177 178 static int 179 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 180 { 181 struct ifnet *ifp; 182 int error, idx; 183 184 /* only support interface specific ioctls */ 185 if (IOCGROUP(cmd) != 'i') 186 return (EOPNOTSUPP); 187 idx = minor(dev); 188 if (idx == 0) { 189 /* 190 * special network device, not interface. 191 */ 192 if (cmd == SIOCGIFCONF) 193 return (ifconf(cmd, data)); /* XXX remove cmd */ 194 #ifdef __amd64__ 195 if (cmd == SIOCGIFCONF32) 196 return (ifconf(cmd, data)); /* XXX remove cmd */ 197 #endif 198 return (EOPNOTSUPP); 199 } 200 201 ifp = ifnet_byindex(idx); 202 if (ifp == NULL) 203 return (ENXIO); 204 205 error = ifhwioctl(cmd, ifp, data, td); 206 if (error == ENOIOCTL) 207 error = EOPNOTSUPP; 208 return (error); 209 } 210 211 static int 212 netkqfilter(struct cdev *dev, struct knote *kn) 213 { 214 struct knlist *klist; 215 struct ifnet *ifp; 216 int idx; 217 218 switch (kn->kn_filter) { 219 case EVFILT_NETDEV: 220 kn->kn_fop = &netdev_filtops; 221 break; 222 default: 223 return (EINVAL); 224 } 225 226 idx = minor(dev); 227 if (idx == 0) { 228 klist = &ifklist; 229 } else { 230 ifp = ifnet_byindex(idx); 231 if (ifp == NULL) 232 return (1); 233 klist = &ifp->if_klist; 234 } 235 236 kn->kn_hook = (caddr_t)klist; 237 238 knlist_add(klist, kn, 0); 239 240 return (0); 241 } 242 243 static void 244 filt_netdetach(struct knote *kn) 245 { 246 struct knlist *klist = (struct knlist *)kn->kn_hook; 247 248 knlist_remove(klist, kn, 0); 249 } 250 251 static int 252 filt_netdev(struct knote *kn, long hint) 253 { 254 struct knlist *klist = (struct knlist *)kn->kn_hook; 255 256 /* 257 * Currently NOTE_EXIT is abused to indicate device detach. 258 */ 259 if (hint == NOTE_EXIT) { 260 kn->kn_data = NOTE_LINKINV; 261 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 262 knlist_remove_inevent(klist, kn); 263 return (1); 264 } 265 if (hint != 0) 266 kn->kn_data = hint; /* current status */ 267 if (kn->kn_sfflags & hint) 268 kn->kn_fflags |= hint; 269 return (kn->kn_fflags != 0); 270 } 271 272 /* 273 * Network interface utility routines. 274 * 275 * Routines with ifa_ifwith* names take sockaddr *'s as 276 * parameters. 277 */ 278 /* ARGSUSED*/ 279 static void 280 if_init(void *dummy __unused) 281 { 282 283 IFNET_LOCK_INIT(); 284 TAILQ_INIT(&ifnet); 285 knlist_init(&ifklist, NULL, NULL, NULL, NULL); 286 if_grow(); /* create initial table */ 287 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 288 UID_ROOT, GID_WHEEL, 0600, "network"); 289 if_clone_init(); 290 } 291 292 static void 293 if_grow(void) 294 { 295 u_int n; 296 struct ifindex_entry *e; 297 298 if_indexlim <<= 1; 299 n = if_indexlim * sizeof(*e); 300 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 301 if (ifindex_table != NULL) { 302 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 303 free((caddr_t)ifindex_table, M_IFNET); 304 } 305 ifindex_table = e; 306 } 307 308 /* ARGSUSED*/ 309 static void 310 if_check(void *dummy __unused) 311 { 312 struct ifnet *ifp; 313 int s; 314 315 s = splimp(); 316 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 317 TAILQ_FOREACH(ifp, &ifnet, if_link) { 318 if (ifp->if_snd.ifq_maxlen == 0) { 319 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 320 ifp->if_snd.ifq_maxlen = ifqmaxlen; 321 } 322 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 323 if_printf(ifp, 324 "XXX: driver didn't initialize queue mtx\n"); 325 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 326 MTX_NETWORK_LOCK, MTX_DEF); 327 } 328 } 329 IFNET_RUNLOCK(); 330 splx(s); 331 if_slowtimo(0); 332 } 333 334 /* 335 * Allocate a struct ifnet and in index for an interface. 336 */ 337 struct ifnet* 338 if_alloc(u_char type) 339 { 340 struct ifnet *ifp; 341 342 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 343 344 /* 345 * Try to find an empty slot below if_index. If we fail, take 346 * the next slot. 347 * 348 * XXX: should be locked! 349 */ 350 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) { 351 if (ifnet_byindex(ifp->if_index) == NULL) 352 break; 353 } 354 /* Catch if_index overflow. */ 355 if (ifp->if_index < 1) { 356 free(ifp, M_IFNET); 357 return (NULL); 358 } 359 if (ifp->if_index > if_index) 360 if_index = ifp->if_index; 361 if (if_index >= if_indexlim) 362 if_grow(); 363 ifnet_byindex(ifp->if_index) = ifp; 364 365 ifp->if_type = type; 366 367 if (if_com_alloc[type] != NULL) { 368 ifp->if_l2com = if_com_alloc[type](type, ifp); 369 if (ifp->if_l2com == NULL) { 370 free(ifp, M_IFNET); 371 return (NULL); 372 } 373 } 374 IF_ADDR_LOCK_INIT(ifp); 375 376 return (ifp); 377 } 378 379 void 380 if_free(struct ifnet *ifp) 381 { 382 383 /* Do not add code to this function! Add it to if_free_type(). */ 384 if_free_type(ifp, ifp->if_type); 385 } 386 387 void 388 if_free_type(struct ifnet *ifp, u_char type) 389 { 390 391 if (ifp != ifnet_byindex(ifp->if_index)) { 392 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 393 __func__); 394 return; 395 } 396 397 IF_ADDR_LOCK_DESTROY(ifp); 398 399 ifnet_byindex(ifp->if_index) = NULL; 400 401 /* XXX: should be locked with if_findindex() */ 402 while (if_index > 0 && ifnet_byindex(if_index) == NULL) 403 if_index--; 404 405 if (if_com_free[type] != NULL) 406 if_com_free[type](ifp->if_l2com, type); 407 408 free(ifp, M_IFNET); 409 }; 410 411 /* 412 * Attach an interface to the 413 * list of "active" interfaces. 414 */ 415 void 416 if_attach(struct ifnet *ifp) 417 { 418 unsigned socksize, ifasize; 419 int namelen, masklen; 420 struct sockaddr_dl *sdl; 421 struct ifaddr *ifa; 422 423 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 424 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 425 ifp->if_xname); 426 427 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 428 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 429 IF_AFDATA_LOCK_INIT(ifp); 430 ifp->if_afdata_initialized = 0; 431 IFNET_WLOCK(); 432 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 433 IFNET_WUNLOCK(); 434 /* 435 * XXX - 436 * The old code would work if the interface passed a pre-existing 437 * chain of ifaddrs to this code. We don't trust our callers to 438 * properly initialize the tailq, however, so we no longer allow 439 * this unlikely case. 440 */ 441 TAILQ_INIT(&ifp->if_addrhead); 442 TAILQ_INIT(&ifp->if_prefixhead); 443 TAILQ_INIT(&ifp->if_multiaddrs); 444 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 445 getmicrotime(&ifp->if_lastchange); 446 ifp->if_data.ifi_epoch = time_uptime; 447 ifp->if_data.ifi_datalen = sizeof(struct if_data); 448 449 #ifdef MAC 450 mac_init_ifnet(ifp); 451 mac_create_ifnet(ifp); 452 #endif 453 454 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 455 unit2minor(ifp->if_index), 456 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 457 net_cdevsw.d_name, ifp->if_xname); 458 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 459 net_cdevsw.d_name, ifp->if_index); 460 461 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 462 463 /* 464 * create a Link Level name for this device 465 */ 466 namelen = strlen(ifp->if_xname); 467 /* 468 * Always save enough space for any possiable name so we can do 469 * a rename in place later. 470 */ 471 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 472 socksize = masklen + ifp->if_addrlen; 473 if (socksize < sizeof(*sdl)) 474 socksize = sizeof(*sdl); 475 socksize = roundup2(socksize, sizeof(long)); 476 ifasize = sizeof(*ifa) + 2 * socksize; 477 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 478 IFA_LOCK_INIT(ifa); 479 sdl = (struct sockaddr_dl *)(ifa + 1); 480 sdl->sdl_len = socksize; 481 sdl->sdl_family = AF_LINK; 482 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 483 sdl->sdl_nlen = namelen; 484 sdl->sdl_index = ifp->if_index; 485 sdl->sdl_type = ifp->if_type; 486 ifp->if_addr = ifa; 487 ifa->ifa_ifp = ifp; 488 ifa->ifa_rtrequest = link_rtrequest; 489 ifa->ifa_addr = (struct sockaddr *)sdl; 490 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 491 ifa->ifa_netmask = (struct sockaddr *)sdl; 492 sdl->sdl_len = masklen; 493 while (namelen != 0) 494 sdl->sdl_data[--namelen] = 0xff; 495 ifa->ifa_refcnt = 1; 496 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 497 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 498 ifp->if_snd.altq_type = 0; 499 ifp->if_snd.altq_disc = NULL; 500 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 501 ifp->if_snd.altq_tbr = NULL; 502 ifp->if_snd.altq_ifp = ifp; 503 504 if (domain_init_status >= 2) 505 if_attachdomain1(ifp); 506 507 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 508 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 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 && 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. 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 /* 628 * Remove routes and flush queues. 629 */ 630 s = splnet(); 631 if_down(ifp); 632 #ifdef ALTQ 633 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 634 altq_disable(&ifp->if_snd); 635 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 636 altq_detach(&ifp->if_snd); 637 #endif 638 639 if_purgeaddrs(ifp); 640 641 #ifdef INET 642 in_ifdetach(ifp); 643 #endif 644 645 #ifdef INET6 646 /* 647 * Remove all IPv6 kernel structs related to ifp. This should be done 648 * before removing routing entries below, since IPv6 interface direct 649 * routes are expected to be removed by the IPv6-specific kernel API. 650 * Otherwise, the kernel will detect some inconsistency and bark it. 651 */ 652 in6_ifdetach(ifp); 653 #endif 654 /* 655 * Remove link ifaddr pointer and maybe decrement if_index. 656 * Clean up all addresses. 657 */ 658 ifp->if_addr = NULL; 659 destroy_dev(ifdev_byindex(ifp->if_index)); 660 ifdev_byindex(ifp->if_index) = NULL; 661 662 /* We can now free link ifaddr. */ 663 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 664 ifa = TAILQ_FIRST(&ifp->if_addrhead); 665 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 666 IFAFREE(ifa); 667 } 668 669 /* 670 * Delete all remaining routes using this interface 671 * Unfortuneatly the only way to do this is to slog through 672 * the entire routing table looking for routes which point 673 * to this interface...oh well... 674 */ 675 for (i = 1; i <= AF_MAX; i++) { 676 if ((rnh = rt_tables[i]) == NULL) 677 continue; 678 RADIX_NODE_HEAD_LOCK(rnh); 679 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 680 RADIX_NODE_HEAD_UNLOCK(rnh); 681 } 682 683 /* Announce that the interface is gone. */ 684 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 685 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 686 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 687 688 IF_AFDATA_LOCK(ifp); 689 for (dp = domains; dp; dp = dp->dom_next) { 690 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 691 (*dp->dom_ifdetach)(ifp, 692 ifp->if_afdata[dp->dom_family]); 693 } 694 IF_AFDATA_UNLOCK(ifp); 695 696 #ifdef MAC 697 mac_destroy_ifnet(ifp); 698 #endif /* MAC */ 699 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 700 knlist_clear(&ifp->if_klist, 0); 701 knlist_destroy(&ifp->if_klist); 702 IFNET_WLOCK(); 703 found = 0; 704 TAILQ_FOREACH(iter, &ifnet, if_link) 705 if (iter == ifp) { 706 found = 1; 707 break; 708 } 709 if (found) 710 TAILQ_REMOVE(&ifnet, ifp, if_link); 711 IFNET_WUNLOCK(); 712 mtx_destroy(&ifp->if_snd.ifq_mtx); 713 IF_AFDATA_DESTROY(ifp); 714 splx(s); 715 } 716 717 /* 718 * Delete Routes for a Network Interface 719 * 720 * Called for each routing entry via the rnh->rnh_walktree() call above 721 * to delete all route entries referencing a detaching network interface. 722 * 723 * Arguments: 724 * rn pointer to node in the routing table 725 * arg argument passed to rnh->rnh_walktree() - detaching interface 726 * 727 * Returns: 728 * 0 successful 729 * errno failed - reason indicated 730 * 731 */ 732 static int 733 if_rtdel(struct radix_node *rn, void *arg) 734 { 735 struct rtentry *rt = (struct rtentry *)rn; 736 struct ifnet *ifp = arg; 737 int err; 738 739 if (rt->rt_ifp == ifp) { 740 741 /* 742 * Protect (sorta) against walktree recursion problems 743 * with cloned routes 744 */ 745 if ((rt->rt_flags & RTF_UP) == 0) 746 return (0); 747 748 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 749 rt_mask(rt), rt->rt_flags, 750 (struct rtentry **) NULL); 751 if (err) { 752 log(LOG_WARNING, "if_rtdel: error %d\n", err); 753 } 754 } 755 756 return (0); 757 } 758 759 #define sa_equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 760 761 /* 762 * Locate an interface based on a complete address. 763 */ 764 /*ARGSUSED*/ 765 struct ifaddr * 766 ifa_ifwithaddr(struct sockaddr *addr) 767 { 768 struct ifnet *ifp; 769 struct ifaddr *ifa; 770 771 IFNET_RLOCK(); 772 TAILQ_FOREACH(ifp, &ifnet, if_link) 773 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 774 if (ifa->ifa_addr->sa_family != addr->sa_family) 775 continue; 776 if (sa_equal(addr, ifa->ifa_addr)) 777 goto done; 778 /* IP6 doesn't have broadcast */ 779 if ((ifp->if_flags & IFF_BROADCAST) && 780 ifa->ifa_broadaddr && 781 ifa->ifa_broadaddr->sa_len != 0 && 782 sa_equal(ifa->ifa_broadaddr, addr)) 783 goto done; 784 } 785 ifa = NULL; 786 done: 787 IFNET_RUNLOCK(); 788 return (ifa); 789 } 790 791 /* 792 * Locate the point to point interface with a given destination address. 793 */ 794 /*ARGSUSED*/ 795 struct ifaddr * 796 ifa_ifwithdstaddr(struct sockaddr *addr) 797 { 798 struct ifnet *ifp; 799 struct ifaddr *ifa; 800 801 IFNET_RLOCK(); 802 TAILQ_FOREACH(ifp, &ifnet, if_link) { 803 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 804 continue; 805 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 806 if (ifa->ifa_addr->sa_family != addr->sa_family) 807 continue; 808 if (ifa->ifa_dstaddr && 809 sa_equal(addr, ifa->ifa_dstaddr)) 810 goto done; 811 } 812 } 813 ifa = NULL; 814 done: 815 IFNET_RUNLOCK(); 816 return (ifa); 817 } 818 819 /* 820 * Find an interface on a specific network. If many, choice 821 * is most specific found. 822 */ 823 struct ifaddr * 824 ifa_ifwithnet(struct sockaddr *addr) 825 { 826 struct ifnet *ifp; 827 struct ifaddr *ifa; 828 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 829 u_int af = addr->sa_family; 830 char *addr_data = addr->sa_data, *cplim; 831 832 /* 833 * AF_LINK addresses can be looked up directly by their index number, 834 * so do that if we can. 835 */ 836 if (af == AF_LINK) { 837 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 838 if (sdl->sdl_index && sdl->sdl_index <= if_index) 839 return (ifaddr_byindex(sdl->sdl_index)); 840 } 841 842 /* 843 * Scan though each interface, looking for ones that have 844 * addresses in this address family. 845 */ 846 IFNET_RLOCK(); 847 TAILQ_FOREACH(ifp, &ifnet, if_link) { 848 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 849 char *cp, *cp2, *cp3; 850 851 if (ifa->ifa_addr->sa_family != af) 852 next: continue; 853 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 854 /* 855 * This is a bit broken as it doesn't 856 * take into account that the remote end may 857 * be a single node in the network we are 858 * looking for. 859 * The trouble is that we don't know the 860 * netmask for the remote end. 861 */ 862 if (ifa->ifa_dstaddr != 0 && 863 sa_equal(addr, ifa->ifa_dstaddr)) 864 goto done; 865 } else { 866 /* 867 * if we have a special address handler, 868 * then use it instead of the generic one. 869 */ 870 if (ifa->ifa_claim_addr) { 871 if ((*ifa->ifa_claim_addr)(ifa, addr)) 872 goto done; 873 continue; 874 } 875 876 /* 877 * Scan all the bits in the ifa's address. 878 * If a bit dissagrees with what we are 879 * looking for, mask it with the netmask 880 * to see if it really matters. 881 * (A byte at a time) 882 */ 883 if (ifa->ifa_netmask == 0) 884 continue; 885 cp = addr_data; 886 cp2 = ifa->ifa_addr->sa_data; 887 cp3 = ifa->ifa_netmask->sa_data; 888 cplim = ifa->ifa_netmask->sa_len 889 + (char *)ifa->ifa_netmask; 890 while (cp3 < cplim) 891 if ((*cp++ ^ *cp2++) & *cp3++) 892 goto next; /* next address! */ 893 /* 894 * If the netmask of what we just found 895 * is more specific than what we had before 896 * (if we had one) then remember the new one 897 * before continuing to search 898 * for an even better one. 899 */ 900 if (ifa_maybe == 0 || 901 rn_refines((caddr_t)ifa->ifa_netmask, 902 (caddr_t)ifa_maybe->ifa_netmask)) 903 ifa_maybe = ifa; 904 } 905 } 906 } 907 ifa = ifa_maybe; 908 done: 909 IFNET_RUNLOCK(); 910 return (ifa); 911 } 912 913 /* 914 * Find an interface address specific to an interface best matching 915 * a given address. 916 */ 917 struct ifaddr * 918 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 919 { 920 struct ifaddr *ifa; 921 char *cp, *cp2, *cp3; 922 char *cplim; 923 struct ifaddr *ifa_maybe = 0; 924 u_int af = addr->sa_family; 925 926 if (af >= AF_MAX) 927 return (0); 928 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 929 if (ifa->ifa_addr->sa_family != af) 930 continue; 931 if (ifa_maybe == 0) 932 ifa_maybe = ifa; 933 if (ifa->ifa_netmask == 0) { 934 if (sa_equal(addr, ifa->ifa_addr) || 935 (ifa->ifa_dstaddr && 936 sa_equal(addr, ifa->ifa_dstaddr))) 937 goto done; 938 continue; 939 } 940 if (ifp->if_flags & IFF_POINTOPOINT) { 941 if (sa_equal(addr, ifa->ifa_dstaddr)) 942 goto done; 943 } else { 944 cp = addr->sa_data; 945 cp2 = ifa->ifa_addr->sa_data; 946 cp3 = ifa->ifa_netmask->sa_data; 947 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 948 for (; cp3 < cplim; cp3++) 949 if ((*cp++ ^ *cp2++) & *cp3) 950 break; 951 if (cp3 == cplim) 952 goto done; 953 } 954 } 955 ifa = ifa_maybe; 956 done: 957 return (ifa); 958 } 959 960 #include <net/route.h> 961 962 /* 963 * Default action when installing a route with a Link Level gateway. 964 * Lookup an appropriate real ifa to point to. 965 * This should be moved to /sys/net/link.c eventually. 966 */ 967 static void 968 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 969 { 970 struct ifaddr *ifa, *oifa; 971 struct sockaddr *dst; 972 struct ifnet *ifp; 973 974 RT_LOCK_ASSERT(rt); 975 976 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 977 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 978 return; 979 ifa = ifaof_ifpforaddr(dst, ifp); 980 if (ifa) { 981 IFAREF(ifa); /* XXX */ 982 oifa = rt->rt_ifa; 983 rt->rt_ifa = ifa; 984 IFAFREE(oifa); 985 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 986 ifa->ifa_rtrequest(cmd, rt, info); 987 } 988 } 989 990 /* 991 * Mark an interface down and notify protocols of 992 * the transition. 993 * NOTE: must be called at splnet or eqivalent. 994 */ 995 static void 996 if_unroute(struct ifnet *ifp, int flag, int fam) 997 { 998 struct ifaddr *ifa; 999 1000 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1001 1002 ifp->if_flags &= ~flag; 1003 getmicrotime(&ifp->if_lastchange); 1004 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1005 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1006 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1007 if_qflush(&ifp->if_snd); 1008 #ifdef DEV_CARP 1009 if (ifp->if_carp) 1010 carp_carpdev_state(ifp->if_carp); 1011 #endif 1012 rt_ifmsg(ifp); 1013 } 1014 1015 /* 1016 * Mark an interface up and notify protocols of 1017 * the transition. 1018 * NOTE: must be called at splnet or eqivalent. 1019 */ 1020 static void 1021 if_route(struct ifnet *ifp, int flag, int fam) 1022 { 1023 struct ifaddr *ifa; 1024 1025 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1026 1027 ifp->if_flags |= flag; 1028 getmicrotime(&ifp->if_lastchange); 1029 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1030 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1031 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1032 #ifdef DEV_CARP 1033 if (ifp->if_carp) 1034 carp_carpdev_state(ifp->if_carp); 1035 #endif 1036 rt_ifmsg(ifp); 1037 #ifdef INET6 1038 in6_if_up(ifp); 1039 #endif 1040 } 1041 1042 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1043 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1044 1045 /* 1046 * Handle a change in the interface link state. To avoid LORs 1047 * between driver lock and upper layer locks, as well as possible 1048 * recursions, we post event to taskqueue, and all job 1049 * is done in static do_link_state_change(). 1050 */ 1051 void 1052 if_link_state_change(struct ifnet *ifp, int link_state) 1053 { 1054 /* Return if state hasn't changed. */ 1055 if (ifp->if_link_state == link_state) 1056 return; 1057 1058 ifp->if_link_state = link_state; 1059 1060 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1061 } 1062 1063 static void 1064 do_link_state_change(void *arg, int pending) 1065 { 1066 struct ifnet *ifp = (struct ifnet *)arg; 1067 int link_state = ifp->if_link_state; 1068 int link; 1069 1070 /* Notify that the link state has changed. */ 1071 rt_ifmsg(ifp); 1072 if (link_state == LINK_STATE_UP) 1073 link = NOTE_LINKUP; 1074 else if (link_state == LINK_STATE_DOWN) 1075 link = NOTE_LINKDOWN; 1076 else 1077 link = NOTE_LINKINV; 1078 KNOTE_UNLOCKED(&ifp->if_klist, link); 1079 if (ifp->if_vlantrunk != NULL) 1080 (*vlan_link_state_p)(ifp, link); 1081 1082 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1083 IFP2AC(ifp)->ac_netgraph != NULL) 1084 (*ng_ether_link_state_p)(ifp, link_state); 1085 #ifdef DEV_CARP 1086 if (ifp->if_carp) 1087 carp_carpdev_state(ifp->if_carp); 1088 #endif 1089 if (ifp->if_bridge) { 1090 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1091 (*bstp_linkstate_p)(ifp, link_state); 1092 } 1093 1094 devctl_notify("IFNET", ifp->if_xname, 1095 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1096 if (pending > 1) 1097 if_printf(ifp, "%d link states coalesced\n", pending); 1098 if (log_link_state_change) 1099 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1100 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1101 } 1102 1103 /* 1104 * Mark an interface down and notify protocols of 1105 * the transition. 1106 * NOTE: must be called at splnet or eqivalent. 1107 */ 1108 void 1109 if_down(struct ifnet *ifp) 1110 { 1111 1112 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1113 } 1114 1115 /* 1116 * Mark an interface up and notify protocols of 1117 * the transition. 1118 * NOTE: must be called at splnet or eqivalent. 1119 */ 1120 void 1121 if_up(struct ifnet *ifp) 1122 { 1123 1124 if_route(ifp, IFF_UP, AF_UNSPEC); 1125 } 1126 1127 /* 1128 * Flush an interface queue. 1129 */ 1130 static void 1131 if_qflush(struct ifaltq *ifq) 1132 { 1133 struct mbuf *m, *n; 1134 1135 IFQ_LOCK(ifq); 1136 #ifdef ALTQ 1137 if (ALTQ_IS_ENABLED(ifq)) 1138 ALTQ_PURGE(ifq); 1139 #endif 1140 n = ifq->ifq_head; 1141 while ((m = n) != 0) { 1142 n = m->m_act; 1143 m_freem(m); 1144 } 1145 ifq->ifq_head = 0; 1146 ifq->ifq_tail = 0; 1147 ifq->ifq_len = 0; 1148 IFQ_UNLOCK(ifq); 1149 } 1150 1151 /* 1152 * Handle interface watchdog timer routines. Called 1153 * from softclock, we decrement timers (if set) and 1154 * call the appropriate interface routine on expiration. 1155 * 1156 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1157 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1158 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1159 */ 1160 static void 1161 if_slowtimo(void *arg) 1162 { 1163 struct ifnet *ifp; 1164 int s = splimp(); 1165 1166 IFNET_RLOCK(); 1167 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1168 if (ifp->if_timer == 0 || --ifp->if_timer) 1169 continue; 1170 if (ifp->if_watchdog) 1171 (*ifp->if_watchdog)(ifp); 1172 } 1173 IFNET_RUNLOCK(); 1174 splx(s); 1175 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1176 } 1177 1178 /* 1179 * Map interface name to 1180 * interface structure pointer. 1181 */ 1182 struct ifnet * 1183 ifunit(const char *name) 1184 { 1185 struct ifnet *ifp; 1186 1187 IFNET_RLOCK(); 1188 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1189 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1190 break; 1191 } 1192 IFNET_RUNLOCK(); 1193 return (ifp); 1194 } 1195 1196 /* 1197 * Hardware specific interface ioctls. 1198 */ 1199 static int 1200 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1201 { 1202 struct ifreq *ifr; 1203 struct ifstat *ifs; 1204 int error = 0; 1205 int new_flags, temp_flags; 1206 size_t namelen, onamelen; 1207 char new_name[IFNAMSIZ]; 1208 struct ifaddr *ifa; 1209 struct sockaddr_dl *sdl; 1210 1211 ifr = (struct ifreq *)data; 1212 switch (cmd) { 1213 case SIOCGIFINDEX: 1214 ifr->ifr_index = ifp->if_index; 1215 break; 1216 1217 case SIOCGIFFLAGS: 1218 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1219 ifr->ifr_flags = temp_flags & 0xffff; 1220 ifr->ifr_flagshigh = temp_flags >> 16; 1221 break; 1222 1223 case SIOCGIFCAP: 1224 ifr->ifr_reqcap = ifp->if_capabilities; 1225 ifr->ifr_curcap = ifp->if_capenable; 1226 break; 1227 1228 #ifdef MAC 1229 case SIOCGIFMAC: 1230 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1231 break; 1232 #endif 1233 1234 case SIOCGIFMETRIC: 1235 ifr->ifr_metric = ifp->if_metric; 1236 break; 1237 1238 case SIOCGIFMTU: 1239 ifr->ifr_mtu = ifp->if_mtu; 1240 break; 1241 1242 case SIOCGIFPHYS: 1243 ifr->ifr_phys = ifp->if_physical; 1244 break; 1245 1246 case SIOCSIFFLAGS: 1247 error = suser(td); 1248 if (error) 1249 return (error); 1250 /* 1251 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1252 * check, so we don't need special handling here yet. 1253 */ 1254 new_flags = (ifr->ifr_flags & 0xffff) | 1255 (ifr->ifr_flagshigh << 16); 1256 if (ifp->if_flags & IFF_SMART) { 1257 /* Smart drivers twiddle their own routes */ 1258 } else if (ifp->if_flags & IFF_UP && 1259 (new_flags & IFF_UP) == 0) { 1260 int s = splimp(); 1261 if_down(ifp); 1262 splx(s); 1263 } else if (new_flags & IFF_UP && 1264 (ifp->if_flags & IFF_UP) == 0) { 1265 int s = splimp(); 1266 if_up(ifp); 1267 splx(s); 1268 } 1269 /* See if permanently promiscuous mode bit is about to flip */ 1270 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 1271 if (new_flags & IFF_PPROMISC) 1272 ifp->if_flags |= IFF_PROMISC; 1273 else if (ifp->if_pcount == 0) 1274 ifp->if_flags &= ~IFF_PROMISC; 1275 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 1276 ifp->if_xname, 1277 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 1278 } 1279 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1280 (new_flags &~ IFF_CANTCHANGE); 1281 if (ifp->if_ioctl) { 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 = ifp->if_addr; 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 to check, 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 /* Sanity checks to catch programming errors */ 1613 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 1614 ("%s: setting driver-owned flag %d", __func__, flag)); 1615 1616 if (onswitch) 1617 KASSERT(*refcount >= 0, 1618 ("%s: increment negative refcount %d for flag %d", 1619 __func__, *refcount, flag)); 1620 else 1621 KASSERT(*refcount > 0, 1622 ("%s: decrement non-positive refcount %d for flag %d", 1623 __func__, *refcount, flag)); 1624 1625 /* In case this mode is permanent, just touch refcount */ 1626 if (ifp->if_flags & pflag) { 1627 *refcount += onswitch ? 1 : -1; 1628 return (0); 1629 } 1630 1631 /* Save ifnet parameters for if_ioctl() may fail */ 1632 oldcount = *refcount; 1633 oldflags = ifp->if_flags; 1634 1635 /* 1636 * See if we aren't the only and touching refcount is enough. 1637 * Actually toggle interface flag if we are the first or last. 1638 */ 1639 if (onswitch) { 1640 if ((*refcount)++) 1641 return (0); 1642 ifp->if_flags |= flag; 1643 } else { 1644 if (--(*refcount)) 1645 return (0); 1646 ifp->if_flags &= ~flag; 1647 } 1648 1649 /* Call down the driver since we've changed interface flags */ 1650 if (ifp->if_ioctl == NULL) { 1651 error = EOPNOTSUPP; 1652 goto recover; 1653 } 1654 ifr.ifr_flags = ifp->if_flags & 0xffff; 1655 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1656 IFF_LOCKGIANT(ifp); 1657 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1658 IFF_UNLOCKGIANT(ifp); 1659 if (error) 1660 goto recover; 1661 /* Notify userland that interface flags have changed */ 1662 rt_ifmsg(ifp); 1663 return (0); 1664 1665 recover: 1666 /* Recover after driver error */ 1667 *refcount = oldcount; 1668 ifp->if_flags = oldflags; 1669 return (error); 1670 } 1671 1672 /* 1673 * Set/clear promiscuous mode on interface ifp based on the truth value 1674 * of pswitch. The calls are reference counted so that only the first 1675 * "on" request actually has an effect, as does the final "off" request. 1676 * Results are undefined if the "off" and "on" requests are not matched. 1677 */ 1678 int 1679 ifpromisc(struct ifnet *ifp, int pswitch) 1680 { 1681 int error; 1682 int oldflags = ifp->if_flags; 1683 1684 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 1685 &ifp->if_pcount, pswitch); 1686 /* If promiscuous mode status has changed, log a message */ 1687 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 1688 log(LOG_INFO, "%s: promiscuous mode %s\n", 1689 ifp->if_xname, 1690 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1691 return (error); 1692 } 1693 1694 /* 1695 * Return interface configuration 1696 * of system. List may be used 1697 * in later ioctl's (above) to get 1698 * other information. 1699 */ 1700 /*ARGSUSED*/ 1701 static int 1702 ifconf(u_long cmd, caddr_t data) 1703 { 1704 struct ifconf *ifc = (struct ifconf *)data; 1705 #ifdef __amd64__ 1706 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 1707 struct ifconf ifc_swab; 1708 #endif 1709 struct ifnet *ifp; 1710 struct ifaddr *ifa; 1711 struct ifreq ifr; 1712 struct sbuf *sb; 1713 int error, full = 0, valid_len, max_len; 1714 1715 #ifdef __amd64__ 1716 if (cmd == SIOCGIFCONF32) { 1717 ifc_swab.ifc_len = ifc32->ifc_len; 1718 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 1719 ifc = &ifc_swab; 1720 } 1721 #endif 1722 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 1723 max_len = MAXPHYS - 1; 1724 1725 /* Prevent hostile input from being able to crash the system */ 1726 if (ifc->ifc_len <= 0) 1727 return (EINVAL); 1728 1729 again: 1730 if (ifc->ifc_len <= max_len) { 1731 max_len = ifc->ifc_len; 1732 full = 1; 1733 } 1734 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 1735 max_len = 0; 1736 valid_len = 0; 1737 1738 IFNET_RLOCK(); /* could sleep XXX */ 1739 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1740 int addrs; 1741 1742 /* 1743 * Zero the ifr_name buffer to make sure we don't 1744 * disclose the contents of the stack. 1745 */ 1746 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 1747 1748 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1749 >= sizeof(ifr.ifr_name)) { 1750 sbuf_delete(sb); 1751 IFNET_RUNLOCK(); 1752 return (ENAMETOOLONG); 1753 } 1754 1755 addrs = 0; 1756 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1757 struct sockaddr *sa = ifa->ifa_addr; 1758 1759 if (jailed(curthread->td_ucred) && 1760 prison_if(curthread->td_ucred, sa)) 1761 continue; 1762 addrs++; 1763 #ifdef COMPAT_43 1764 if (cmd == OSIOCGIFCONF) { 1765 struct osockaddr *osa = 1766 (struct osockaddr *)&ifr.ifr_addr; 1767 ifr.ifr_addr = *sa; 1768 osa->sa_family = sa->sa_family; 1769 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1770 max_len += sizeof(ifr); 1771 } else 1772 #endif 1773 if (sa->sa_len <= sizeof(*sa)) { 1774 ifr.ifr_addr = *sa; 1775 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1776 max_len += sizeof(ifr); 1777 } else { 1778 sbuf_bcat(sb, &ifr, 1779 offsetof(struct ifreq, ifr_addr)); 1780 max_len += offsetof(struct ifreq, ifr_addr); 1781 sbuf_bcat(sb, sa, sa->sa_len); 1782 max_len += sa->sa_len; 1783 } 1784 1785 if (!sbuf_overflowed(sb)) 1786 valid_len = sbuf_len(sb); 1787 } 1788 if (addrs == 0) { 1789 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1790 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1791 max_len += sizeof(ifr); 1792 1793 if (!sbuf_overflowed(sb)) 1794 valid_len = sbuf_len(sb); 1795 } 1796 } 1797 IFNET_RUNLOCK(); 1798 1799 /* 1800 * If we didn't allocate enough space (uncommon), try again. If 1801 * we have already allocated as much space as we are allowed, 1802 * return what we've got. 1803 */ 1804 if (valid_len != max_len && !full) { 1805 sbuf_delete(sb); 1806 goto again; 1807 } 1808 1809 ifc->ifc_len = valid_len; 1810 #ifdef __amd64__ 1811 if (cmd == SIOCGIFCONF32) 1812 ifc32->ifc_len = valid_len; 1813 #endif 1814 sbuf_finish(sb); 1815 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 1816 sbuf_delete(sb); 1817 return (error); 1818 } 1819 1820 /* 1821 * Just like ifpromisc(), but for all-multicast-reception mode. 1822 */ 1823 int 1824 if_allmulti(struct ifnet *ifp, int onswitch) 1825 { 1826 1827 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 1828 } 1829 1830 static struct ifmultiaddr * 1831 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 1832 { 1833 struct ifmultiaddr *ifma; 1834 1835 IF_ADDR_LOCK_ASSERT(ifp); 1836 1837 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1838 if (sa_equal(ifma->ifma_addr, sa)) 1839 break; 1840 } 1841 1842 return ifma; 1843 } 1844 1845 /* 1846 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 1847 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 1848 * the ifnet multicast address list here, so the caller must do that and 1849 * other setup work (such as notifying the device driver). The reference 1850 * count is initialized to 1. 1851 */ 1852 static struct ifmultiaddr * 1853 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 1854 int mflags) 1855 { 1856 struct ifmultiaddr *ifma; 1857 struct sockaddr *dupsa; 1858 1859 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags | 1860 M_ZERO); 1861 if (ifma == NULL) 1862 return (NULL); 1863 1864 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags); 1865 if (dupsa == NULL) { 1866 FREE(ifma, M_IFMADDR); 1867 return (NULL); 1868 } 1869 bcopy(sa, dupsa, sa->sa_len); 1870 ifma->ifma_addr = dupsa; 1871 1872 ifma->ifma_ifp = ifp; 1873 ifma->ifma_refcount = 1; 1874 ifma->ifma_protospec = NULL; 1875 1876 if (llsa == NULL) { 1877 ifma->ifma_lladdr = NULL; 1878 return (ifma); 1879 } 1880 1881 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags); 1882 if (dupsa == NULL) { 1883 FREE(ifma->ifma_addr, M_IFMADDR); 1884 FREE(ifma, M_IFMADDR); 1885 return (NULL); 1886 } 1887 bcopy(llsa, dupsa, llsa->sa_len); 1888 ifma->ifma_lladdr = dupsa; 1889 1890 return (ifma); 1891 } 1892 1893 /* 1894 * if_freemulti: free ifmultiaddr structure and possibly attached related 1895 * addresses. The caller is responsible for implementing reference 1896 * counting, notifying the driver, handling routing messages, and releasing 1897 * any dependent link layer state. 1898 */ 1899 static void 1900 if_freemulti(struct ifmultiaddr *ifma) 1901 { 1902 1903 KASSERT(ifma->ifma_refcount == 1, ("if_freemulti: refcount %d", 1904 ifma->ifma_refcount)); 1905 KASSERT(ifma->ifma_protospec == NULL, 1906 ("if_freemulti: protospec not NULL")); 1907 1908 if (ifma->ifma_lladdr != NULL) 1909 FREE(ifma->ifma_lladdr, M_IFMADDR); 1910 FREE(ifma->ifma_addr, M_IFMADDR); 1911 FREE(ifma, M_IFMADDR); 1912 } 1913 1914 /* 1915 * Register an additional multicast address with a network interface. 1916 * 1917 * - If the address is already present, bump the reference count on the 1918 * address and return. 1919 * - If the address is not link-layer, look up a link layer address. 1920 * - Allocate address structures for one or both addresses, and attach to the 1921 * multicast address list on the interface. If automatically adding a link 1922 * layer address, the protocol address will own a reference to the link 1923 * layer address, to be freed when it is freed. 1924 * - Notify the network device driver of an addition to the multicast address 1925 * list. 1926 * 1927 * 'sa' points to caller-owned memory with the desired multicast address. 1928 * 1929 * 'retifma' will be used to return a pointer to the resulting multicast 1930 * address reference, if desired. 1931 */ 1932 int 1933 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 1934 struct ifmultiaddr **retifma) 1935 { 1936 struct ifmultiaddr *ifma, *ll_ifma; 1937 struct sockaddr *llsa; 1938 int error; 1939 1940 /* 1941 * If the address is already present, return a new reference to it; 1942 * otherwise, allocate storage and set up a new address. 1943 */ 1944 IF_ADDR_LOCK(ifp); 1945 ifma = if_findmulti(ifp, sa); 1946 if (ifma != NULL) { 1947 ifma->ifma_refcount++; 1948 if (retifma != NULL) 1949 *retifma = ifma; 1950 IF_ADDR_UNLOCK(ifp); 1951 return (0); 1952 } 1953 1954 /* 1955 * The address isn't already present; resolve the protocol address 1956 * into a link layer address, and then look that up, bump its 1957 * refcount or allocate an ifma for that also. If 'llsa' was 1958 * returned, we will need to free it later. 1959 */ 1960 llsa = NULL; 1961 ll_ifma = NULL; 1962 if (ifp->if_resolvemulti != NULL) { 1963 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1964 if (error) 1965 goto unlock_out; 1966 } 1967 1968 /* 1969 * Allocate the new address. Don't hook it up yet, as we may also 1970 * need to allocate a link layer multicast address. 1971 */ 1972 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 1973 if (ifma == NULL) { 1974 error = ENOMEM; 1975 goto free_llsa_out; 1976 } 1977 1978 /* 1979 * If a link layer address is found, we'll need to see if it's 1980 * already present in the address list, or allocate is as well. 1981 * When this block finishes, the link layer address will be on the 1982 * list. 1983 */ 1984 if (llsa != NULL) { 1985 ll_ifma = if_findmulti(ifp, llsa); 1986 if (ll_ifma == NULL) { 1987 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 1988 if (ll_ifma == NULL) { 1989 if_freemulti(ifma); 1990 error = ENOMEM; 1991 goto free_llsa_out; 1992 } 1993 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 1994 ifma_link); 1995 } else 1996 ll_ifma->ifma_refcount++; 1997 } 1998 1999 /* 2000 * We now have a new multicast address, ifma, and possibly a new or 2001 * referenced link layer address. Add the primary address to the 2002 * ifnet address list. 2003 */ 2004 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2005 2006 if (retifma != NULL) 2007 *retifma = ifma; 2008 2009 /* 2010 * Must generate the message while holding the lock so that 'ifma' 2011 * pointer is still valid. 2012 * 2013 * XXXRW: How come we don't announce ll_ifma? 2014 */ 2015 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2016 IF_ADDR_UNLOCK(ifp); 2017 2018 /* 2019 * We are certain we have added something, so call down to the 2020 * interface to let them know about it. 2021 */ 2022 if (ifp->if_ioctl != NULL) { 2023 IFF_LOCKGIANT(ifp); 2024 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2025 IFF_UNLOCKGIANT(ifp); 2026 } 2027 2028 if (llsa != NULL) 2029 FREE(llsa, M_IFMADDR); 2030 2031 return (0); 2032 2033 free_llsa_out: 2034 if (llsa != NULL) 2035 FREE(llsa, M_IFMADDR); 2036 2037 unlock_out: 2038 IF_ADDR_UNLOCK(ifp); 2039 return (error); 2040 } 2041 2042 /* 2043 * Remove a reference to a multicast address on this interface. Yell 2044 * if the request does not match an existing membership. 2045 */ 2046 int 2047 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2048 { 2049 struct ifmultiaddr *ifma, *ll_ifma; 2050 2051 IF_ADDR_LOCK(ifp); 2052 ifma = if_findmulti(ifp, sa); 2053 if (ifma == NULL) { 2054 IF_ADDR_UNLOCK(ifp); 2055 return ENOENT; 2056 } 2057 2058 if (ifma->ifma_refcount > 1) { 2059 ifma->ifma_refcount--; 2060 IF_ADDR_UNLOCK(ifp); 2061 return 0; 2062 } 2063 2064 sa = ifma->ifma_lladdr; 2065 if (sa != NULL) 2066 ll_ifma = if_findmulti(ifp, sa); 2067 else 2068 ll_ifma = NULL; 2069 2070 /* 2071 * XXXRW: How come we don't announce ll_ifma? 2072 */ 2073 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2074 2075 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2076 if_freemulti(ifma); 2077 2078 if (ll_ifma != NULL) { 2079 if (ll_ifma->ifma_refcount == 1) { 2080 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifma_link); 2081 if_freemulti(ll_ifma); 2082 } else 2083 ll_ifma->ifma_refcount--; 2084 } 2085 IF_ADDR_UNLOCK(ifp); 2086 2087 /* 2088 * Make sure the interface driver is notified 2089 * in the case of a link layer mcast group being left. 2090 */ 2091 if (ifp->if_ioctl) { 2092 IFF_LOCKGIANT(ifp); 2093 (void) (*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2094 IFF_UNLOCKGIANT(ifp); 2095 } 2096 2097 return 0; 2098 } 2099 2100 /* 2101 * Set the link layer address on an interface. 2102 * 2103 * At this time we only support certain types of interfaces, 2104 * and we don't allow the length of the address to change. 2105 */ 2106 int 2107 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2108 { 2109 struct sockaddr_dl *sdl; 2110 struct ifaddr *ifa; 2111 struct ifreq ifr; 2112 2113 ifa = ifp->if_addr; 2114 if (ifa == NULL) 2115 return (EINVAL); 2116 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2117 if (sdl == NULL) 2118 return (EINVAL); 2119 if (len != sdl->sdl_alen) /* don't allow length to change */ 2120 return (EINVAL); 2121 switch (ifp->if_type) { 2122 case IFT_ETHER: 2123 case IFT_FDDI: 2124 case IFT_XETHER: 2125 case IFT_ISO88025: 2126 case IFT_L2VLAN: 2127 case IFT_BRIDGE: 2128 case IFT_ARCNET: 2129 bcopy(lladdr, LLADDR(sdl), len); 2130 break; 2131 default: 2132 return (ENODEV); 2133 } 2134 /* 2135 * If the interface is already up, we need 2136 * to re-init it in order to reprogram its 2137 * address filter. 2138 */ 2139 if ((ifp->if_flags & IFF_UP) != 0) { 2140 if (ifp->if_ioctl) { 2141 IFF_LOCKGIANT(ifp); 2142 ifp->if_flags &= ~IFF_UP; 2143 ifr.ifr_flags = ifp->if_flags & 0xffff; 2144 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2145 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2146 ifp->if_flags |= IFF_UP; 2147 ifr.ifr_flags = ifp->if_flags & 0xffff; 2148 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2149 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2150 IFF_UNLOCKGIANT(ifp); 2151 } 2152 #ifdef INET 2153 /* 2154 * Also send gratuitous ARPs to notify other nodes about 2155 * the address change. 2156 */ 2157 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2158 if (ifa->ifa_addr != NULL && 2159 ifa->ifa_addr->sa_family == AF_INET) 2160 arp_ifinit(ifp, ifa); 2161 } 2162 #endif 2163 } 2164 return (0); 2165 } 2166 2167 /* 2168 * The name argument must be a pointer to storage which will last as 2169 * long as the interface does. For physical devices, the result of 2170 * device_get_name(dev) is a good choice and for pseudo-devices a 2171 * static string works well. 2172 */ 2173 void 2174 if_initname(struct ifnet *ifp, const char *name, int unit) 2175 { 2176 ifp->if_dname = name; 2177 ifp->if_dunit = unit; 2178 if (unit != IF_DUNIT_NONE) 2179 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2180 else 2181 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2182 } 2183 2184 int 2185 if_printf(struct ifnet *ifp, const char * fmt, ...) 2186 { 2187 va_list ap; 2188 int retval; 2189 2190 retval = printf("%s: ", ifp->if_xname); 2191 va_start(ap, fmt); 2192 retval += vprintf(fmt, ap); 2193 va_end(ap); 2194 return (retval); 2195 } 2196 2197 /* 2198 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 2199 * be called without Giant. However, we often can't acquire the Giant lock 2200 * at those points; instead, we run it via a task queue that holds Giant via 2201 * if_start_deferred. 2202 * 2203 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 2204 * outstanding if_start_deferred() tasks that will run after the free. This 2205 * probably means waiting in if_detach(). 2206 */ 2207 void 2208 if_start(struct ifnet *ifp) 2209 { 2210 2211 NET_ASSERT_GIANT(); 2212 2213 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 2214 if (mtx_owned(&Giant)) 2215 (*(ifp)->if_start)(ifp); 2216 else 2217 taskqueue_enqueue(taskqueue_swi_giant, 2218 &ifp->if_starttask); 2219 } else 2220 (*(ifp)->if_start)(ifp); 2221 } 2222 2223 static void 2224 if_start_deferred(void *context, int pending) 2225 { 2226 struct ifnet *ifp; 2227 2228 /* 2229 * This code must be entered with Giant, and should never run if 2230 * we're not running with debug.mpsafenet. 2231 */ 2232 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 2233 GIANT_REQUIRED; 2234 2235 ifp = context; 2236 (ifp->if_start)(ifp); 2237 } 2238 2239 int 2240 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2241 { 2242 int active = 0; 2243 2244 IF_LOCK(ifq); 2245 if (_IF_QFULL(ifq)) { 2246 _IF_DROP(ifq); 2247 IF_UNLOCK(ifq); 2248 m_freem(m); 2249 return (0); 2250 } 2251 if (ifp != NULL) { 2252 ifp->if_obytes += m->m_pkthdr.len + adjust; 2253 if (m->m_flags & (M_BCAST|M_MCAST)) 2254 ifp->if_omcasts++; 2255 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2256 } 2257 _IF_ENQUEUE(ifq, m); 2258 IF_UNLOCK(ifq); 2259 if (ifp != NULL && !active) 2260 if_start(ifp); 2261 return (1); 2262 } 2263 2264 void 2265 if_register_com_alloc(u_char type, 2266 if_com_alloc_t *a, if_com_free_t *f) 2267 { 2268 2269 KASSERT(if_com_alloc[type] == NULL, 2270 ("if_register_com_alloc: %d already registered", type)); 2271 KASSERT(if_com_free[type] == NULL, 2272 ("if_register_com_alloc: %d free already registered", type)); 2273 2274 if_com_alloc[type] = a; 2275 if_com_free[type] = f; 2276 } 2277 2278 void 2279 if_deregister_com_alloc(u_char type) 2280 { 2281 2282 KASSERT(if_com_alloc[type] == NULL, 2283 ("if_deregister_com_alloc: %d not registered", type)); 2284 KASSERT(if_com_free[type] == NULL, 2285 ("if_deregister_com_alloc: %d free not registered", type)); 2286 if_com_alloc[type] = NULL; 2287 if_com_free[type] = NULL; 2288 } 2289