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