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_route.h" 37 #include "opt_mac.h" 38 #include "opt_carp.h" 39 40 #include <sys/param.h> 41 #include <sys/types.h> 42 #include <sys/conf.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/priv.h> 49 #include <sys/proc.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/protosw.h> 53 #include <sys/kernel.h> 54 #include <sys/lock.h> 55 #include <sys/rwlock.h> 56 #include <sys/sockio.h> 57 #include <sys/syslog.h> 58 #include <sys/sysctl.h> 59 #include <sys/taskqueue.h> 60 #include <sys/domain.h> 61 #include <sys/jail.h> 62 #include <sys/vimage.h> 63 #include <machine/stdarg.h> 64 #include <vm/uma.h> 65 66 #include <net/if.h> 67 #include <net/if_arp.h> 68 #include <net/if_clone.h> 69 #include <net/if_dl.h> 70 #include <net/if_types.h> 71 #include <net/if_var.h> 72 #include <net/radix.h> 73 #include <net/route.h> 74 #include <net/vnet.h> 75 76 #if defined(INET) || defined(INET6) 77 /*XXX*/ 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 #ifdef INET6 81 #include <netinet6/in6_var.h> 82 #include <netinet6/in6_ifattach.h> 83 #endif 84 #endif 85 #ifdef INET 86 #include <netinet/if_ether.h> 87 #include <netinet/vinet.h> 88 #endif 89 #ifdef DEV_CARP 90 #include <netinet/ip_carp.h> 91 #endif 92 93 #include <security/mac/mac_framework.h> 94 95 #ifndef VIMAGE 96 #ifndef VIMAGE_GLOBALS 97 struct vnet_net vnet_net_0; 98 #endif 99 #endif 100 101 static int slowtimo_started; 102 103 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 104 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 105 106 /* Log link state change events */ 107 static int log_link_state_change = 1; 108 109 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 110 &log_link_state_change, 0, 111 "log interface link state change events"); 112 113 void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 114 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 115 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 116 117 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 118 119 /* 120 * XXX: Style; these should be sorted alphabetically, and unprototyped 121 * static functions should be prototyped. Currently they are sorted by 122 * declaration order. 123 */ 124 static void if_attachdomain(void *); 125 static void if_attachdomain1(struct ifnet *); 126 static int ifconf(u_long, caddr_t); 127 static void if_freemulti(struct ifmultiaddr *); 128 static void if_grow(void); 129 static void if_init(void *); 130 static void if_check(void *); 131 static void if_qflush(struct ifnet *); 132 static void if_route(struct ifnet *, int flag, int fam); 133 static int if_setflag(struct ifnet *, int, int, int *, int); 134 static void if_slowtimo(void *); 135 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 136 static void if_unroute(struct ifnet *, int flag, int fam); 137 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 138 static int if_rtdel(struct radix_node *, void *); 139 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 140 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 141 static void do_link_state_change(void *, int); 142 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 143 static int if_getgroupmembers(struct ifgroupreq *); 144 145 #ifdef INET6 146 /* 147 * XXX: declare here to avoid to include many inet6 related files.. 148 * should be more generalized? 149 */ 150 extern void nd6_setmtu(struct ifnet *); 151 #endif 152 153 #ifdef VIMAGE_GLOBALS 154 struct ifnethead ifnet; /* depend on static init XXX */ 155 struct ifgrouphead ifg_head; 156 int if_index; 157 static int if_indexlim; 158 /* Table of ifnet/cdev by index. Locked with ifnet_lock. */ 159 static struct ifindex_entry *ifindex_table; 160 static struct knlist ifklist; 161 #endif 162 163 int ifqmaxlen = IFQ_MAXLEN; 164 struct rwlock ifnet_lock; 165 static if_com_alloc_t *if_com_alloc[256]; 166 static if_com_free_t *if_com_free[256]; 167 168 static void filt_netdetach(struct knote *kn); 169 static int filt_netdev(struct knote *kn, long hint); 170 171 static struct filterops netdev_filtops = 172 { 1, NULL, filt_netdetach, filt_netdev }; 173 174 #ifndef VIMAGE_GLOBALS 175 static struct vnet_symmap vnet_net_symmap[] = { 176 VNET_SYMMAP(net, ifnet), 177 VNET_SYMMAP(net, rt_tables), 178 VNET_SYMMAP(net, rtstat), 179 VNET_SYMMAP(net, rttrash), 180 VNET_SYMMAP_END 181 }; 182 183 VNET_MOD_DECLARE(NET, net, vnet_net_iattach, vnet_net_idetach, 184 NONE, vnet_net_symmap) 185 #endif 186 187 /* 188 * System initialization 189 */ 190 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 191 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL); 192 193 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 194 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 195 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 196 197 static struct ifnet * 198 ifnet_byindex_locked(u_short idx) 199 { 200 INIT_VNET_NET(curvnet); 201 struct ifnet *ifp; 202 203 ifp = V_ifindex_table[idx].ife_ifnet; 204 return (ifp); 205 } 206 207 struct ifnet * 208 ifnet_byindex(u_short idx) 209 { 210 struct ifnet *ifp; 211 212 IFNET_RLOCK(); 213 ifp = ifnet_byindex_locked(idx); 214 IFNET_RUNLOCK(); 215 return (ifp); 216 } 217 218 static void 219 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 220 { 221 INIT_VNET_NET(curvnet); 222 223 IFNET_WLOCK_ASSERT(); 224 225 V_ifindex_table[idx].ife_ifnet = ifp; 226 } 227 228 struct ifaddr * 229 ifaddr_byindex(u_short idx) 230 { 231 struct ifaddr *ifa; 232 233 IFNET_RLOCK(); 234 ifa = ifnet_byindex_locked(idx)->if_addr; 235 IFNET_RUNLOCK(); 236 return (ifa); 237 } 238 239 struct cdev * 240 ifdev_byindex(u_short idx) 241 { 242 INIT_VNET_NET(curvnet); 243 struct cdev *cdev; 244 245 IFNET_RLOCK(); 246 cdev = V_ifindex_table[idx].ife_dev; 247 IFNET_RUNLOCK(); 248 return (cdev); 249 } 250 251 static void 252 ifdev_setbyindex(u_short idx, struct cdev *cdev) 253 { 254 INIT_VNET_NET(curvnet); 255 256 IFNET_WLOCK(); 257 V_ifindex_table[idx].ife_dev = cdev; 258 IFNET_WUNLOCK(); 259 } 260 261 static d_open_t netopen; 262 static d_close_t netclose; 263 static d_ioctl_t netioctl; 264 static d_kqfilter_t netkqfilter; 265 266 static struct cdevsw net_cdevsw = { 267 .d_version = D_VERSION, 268 .d_flags = D_NEEDGIANT, 269 .d_open = netopen, 270 .d_close = netclose, 271 .d_ioctl = netioctl, 272 .d_name = "net", 273 .d_kqfilter = netkqfilter, 274 }; 275 276 static int 277 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 278 { 279 return (0); 280 } 281 282 static int 283 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 284 { 285 return (0); 286 } 287 288 static int 289 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 290 { 291 struct ifnet *ifp; 292 int error, idx; 293 294 /* only support interface specific ioctls */ 295 if (IOCGROUP(cmd) != 'i') 296 return (EOPNOTSUPP); 297 idx = dev2unit(dev); 298 if (idx == 0) { 299 /* 300 * special network device, not interface. 301 */ 302 if (cmd == SIOCGIFCONF) 303 return (ifconf(cmd, data)); /* XXX remove cmd */ 304 #ifdef __amd64__ 305 if (cmd == SIOCGIFCONF32) 306 return (ifconf(cmd, data)); /* XXX remove cmd */ 307 #endif 308 return (EOPNOTSUPP); 309 } 310 311 ifp = ifnet_byindex(idx); 312 if (ifp == NULL) 313 return (ENXIO); 314 315 error = ifhwioctl(cmd, ifp, data, td); 316 if (error == ENOIOCTL) 317 error = EOPNOTSUPP; 318 return (error); 319 } 320 321 static int 322 netkqfilter(struct cdev *dev, struct knote *kn) 323 { 324 INIT_VNET_NET(curvnet); 325 struct knlist *klist; 326 struct ifnet *ifp; 327 int idx; 328 329 switch (kn->kn_filter) { 330 case EVFILT_NETDEV: 331 kn->kn_fop = &netdev_filtops; 332 break; 333 default: 334 return (EINVAL); 335 } 336 337 idx = dev2unit(dev); 338 if (idx == 0) { 339 klist = &V_ifklist; 340 } else { 341 ifp = ifnet_byindex(idx); 342 if (ifp == NULL) 343 return (1); 344 klist = &ifp->if_klist; 345 } 346 347 kn->kn_hook = (caddr_t)klist; 348 349 knlist_add(klist, kn, 0); 350 351 return (0); 352 } 353 354 static void 355 filt_netdetach(struct knote *kn) 356 { 357 struct knlist *klist = (struct knlist *)kn->kn_hook; 358 359 knlist_remove(klist, kn, 0); 360 } 361 362 static int 363 filt_netdev(struct knote *kn, long hint) 364 { 365 struct knlist *klist = (struct knlist *)kn->kn_hook; 366 367 /* 368 * Currently NOTE_EXIT is abused to indicate device detach. 369 */ 370 if (hint == NOTE_EXIT) { 371 kn->kn_data = NOTE_LINKINV; 372 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 373 knlist_remove_inevent(klist, kn); 374 return (1); 375 } 376 if (hint != 0) 377 kn->kn_data = hint; /* current status */ 378 if (kn->kn_sfflags & hint) 379 kn->kn_fflags |= hint; 380 return (kn->kn_fflags != 0); 381 } 382 383 /* 384 * Network interface utility routines. 385 * 386 * Routines with ifa_ifwith* names take sockaddr *'s as 387 * parameters. 388 */ 389 390 /* ARGSUSED*/ 391 static void 392 if_init(void *dummy __unused) 393 { 394 INIT_VNET_NET(curvnet); 395 396 #ifndef VIMAGE_GLOBALS 397 vnet_mod_register(&vnet_net_modinfo); 398 #endif 399 400 V_if_index = 0; 401 V_ifindex_table = NULL; 402 V_if_indexlim = 8; 403 404 IFNET_LOCK_INIT(); 405 TAILQ_INIT(&V_ifnet); 406 TAILQ_INIT(&V_ifg_head); 407 knlist_init(&V_ifklist, NULL, NULL, NULL, NULL); 408 if_grow(); /* create initial table */ 409 ifdev_setbyindex(0, make_dev(&net_cdevsw, 0, UID_ROOT, GID_WHEEL, 410 0600, "network")); 411 if_clone_init(); 412 } 413 414 static void 415 if_grow(void) 416 { 417 INIT_VNET_NET(curvnet); 418 u_int n; 419 struct ifindex_entry *e; 420 421 V_if_indexlim <<= 1; 422 n = V_if_indexlim * sizeof(*e); 423 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 424 if (V_ifindex_table != NULL) { 425 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 426 free((caddr_t)V_ifindex_table, M_IFNET); 427 } 428 V_ifindex_table = e; 429 } 430 431 static void 432 if_check(void *dummy __unused) 433 { 434 435 /* 436 * If at least one interface added during boot uses 437 * if_watchdog then start the timer. 438 */ 439 if (slowtimo_started) 440 if_slowtimo(0); 441 } 442 443 /* 444 * Allocate a struct ifnet and an index for an interface. A layer 2 445 * common structure will also be allocated if an allocation routine is 446 * registered for the passed type. 447 */ 448 struct ifnet* 449 if_alloc(u_char type) 450 { 451 INIT_VNET_NET(curvnet); 452 struct ifnet *ifp; 453 454 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 455 456 /* 457 * Try to find an empty slot below if_index. If we fail, take 458 * the next slot. 459 * 460 * XXX: should be locked! 461 */ 462 for (ifp->if_index = 1; ifp->if_index <= V_if_index; ifp->if_index++) { 463 if (ifnet_byindex(ifp->if_index) == NULL) 464 break; 465 } 466 /* Catch if_index overflow. */ 467 if (ifp->if_index < 1) { 468 free(ifp, M_IFNET); 469 return (NULL); 470 } 471 if (ifp->if_index > V_if_index) 472 V_if_index = ifp->if_index; 473 if (V_if_index >= V_if_indexlim) 474 if_grow(); 475 476 ifp->if_type = type; 477 478 if (if_com_alloc[type] != NULL) { 479 ifp->if_l2com = if_com_alloc[type](type, ifp); 480 if (ifp->if_l2com == NULL) { 481 free(ifp, M_IFNET); 482 return (NULL); 483 } 484 } 485 IFNET_WLOCK(); 486 ifnet_setbyindex(ifp->if_index, ifp); 487 IFNET_WUNLOCK(); 488 IF_ADDR_LOCK_INIT(ifp); 489 490 return (ifp); 491 } 492 493 /* 494 * Free the struct ifnet, the associated index, and the layer 2 common 495 * structure if needed. All the work is done in if_free_type(). 496 * 497 * Do not add code to this function! Add it to if_free_type(). 498 */ 499 void 500 if_free(struct ifnet *ifp) 501 { 502 503 if_free_type(ifp, ifp->if_type); 504 } 505 506 /* 507 * Do the actual work of freeing a struct ifnet, associated index, and 508 * layer 2 common structure. This version should only be called by 509 * intefaces that switch their type after calling if_alloc(). 510 */ 511 void 512 if_free_type(struct ifnet *ifp, u_char type) 513 { 514 INIT_VNET_NET(curvnet); /* ifp->if_vnet can be NULL here ! */ 515 516 if (ifp != ifnet_byindex(ifp->if_index)) { 517 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 518 __func__); 519 return; 520 } 521 522 IFNET_WLOCK(); 523 ifnet_setbyindex(ifp->if_index, NULL); 524 525 /* XXX: should be locked with if_findindex() */ 526 while (V_if_index > 0 && ifnet_byindex_locked(V_if_index) == NULL) 527 V_if_index--; 528 IFNET_WUNLOCK(); 529 530 if (if_com_free[type] != NULL) 531 if_com_free[type](ifp->if_l2com, type); 532 533 IF_ADDR_LOCK_DESTROY(ifp); 534 free(ifp, M_IFNET); 535 } 536 537 void 538 ifq_attach(struct ifaltq *ifq, struct ifnet *ifp) 539 { 540 541 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 542 543 if (ifq->ifq_maxlen == 0) 544 ifq->ifq_maxlen = ifqmaxlen; 545 546 ifq->altq_type = 0; 547 ifq->altq_disc = NULL; 548 ifq->altq_flags &= ALTQF_CANTCHANGE; 549 ifq->altq_tbr = NULL; 550 ifq->altq_ifp = ifp; 551 } 552 553 void 554 ifq_detach(struct ifaltq *ifq) 555 { 556 mtx_destroy(&ifq->ifq_mtx); 557 } 558 559 /* 560 * Perform generic interface initalization tasks and attach the interface 561 * to the list of "active" interfaces. 562 * 563 * XXX: 564 * - The decision to return void and thus require this function to 565 * succeed is questionable. 566 * - We do more initialization here then is probably a good idea. 567 * Some of this should probably move to if_alloc(). 568 * - We should probably do more sanity checking. For instance we don't 569 * do anything to insure if_xname is unique or non-empty. 570 */ 571 void 572 if_attach(struct ifnet *ifp) 573 { 574 INIT_VNET_NET(curvnet); 575 unsigned socksize, ifasize; 576 int namelen, masklen; 577 struct sockaddr_dl *sdl; 578 struct ifaddr *ifa; 579 580 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 581 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 582 ifp->if_xname); 583 584 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 585 IF_AFDATA_LOCK_INIT(ifp); 586 ifp->if_afdata_initialized = 0; 587 588 TAILQ_INIT(&ifp->if_addrhead); 589 TAILQ_INIT(&ifp->if_prefixhead); 590 TAILQ_INIT(&ifp->if_multiaddrs); 591 TAILQ_INIT(&ifp->if_groups); 592 593 if_addgroup(ifp, IFG_ALL); 594 595 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 596 getmicrotime(&ifp->if_lastchange); 597 ifp->if_data.ifi_epoch = time_uptime; 598 ifp->if_data.ifi_datalen = sizeof(struct if_data); 599 ifp->if_transmit = if_transmit; 600 ifp->if_qflush = if_qflush; 601 #ifdef MAC 602 mac_ifnet_init(ifp); 603 mac_ifnet_create(ifp); 604 #endif 605 606 ifdev_setbyindex(ifp->if_index, make_dev(&net_cdevsw, 607 ifp->if_index, UID_ROOT, GID_WHEEL, 0600, "%s/%s", 608 net_cdevsw.d_name, ifp->if_xname)); 609 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 610 net_cdevsw.d_name, ifp->if_index); 611 612 ifq_attach(&ifp->if_snd, ifp); 613 614 /* 615 * create a Link Level name for this device 616 */ 617 namelen = strlen(ifp->if_xname); 618 /* 619 * Always save enough space for any possiable name so we can do 620 * a rename in place later. 621 */ 622 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 623 socksize = masklen + ifp->if_addrlen; 624 if (socksize < sizeof(*sdl)) 625 socksize = sizeof(*sdl); 626 socksize = roundup2(socksize, sizeof(long)); 627 ifasize = sizeof(*ifa) + 2 * socksize; 628 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 629 IFA_LOCK_INIT(ifa); 630 sdl = (struct sockaddr_dl *)(ifa + 1); 631 sdl->sdl_len = socksize; 632 sdl->sdl_family = AF_LINK; 633 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 634 sdl->sdl_nlen = namelen; 635 sdl->sdl_index = ifp->if_index; 636 sdl->sdl_type = ifp->if_type; 637 ifp->if_addr = ifa; 638 ifa->ifa_ifp = ifp; 639 ifa->ifa_rtrequest = link_rtrequest; 640 ifa->ifa_addr = (struct sockaddr *)sdl; 641 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 642 ifa->ifa_netmask = (struct sockaddr *)sdl; 643 sdl->sdl_len = masklen; 644 while (namelen != 0) 645 sdl->sdl_data[--namelen] = 0xff; 646 ifa->ifa_refcnt = 1; 647 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 648 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 649 650 651 IFNET_WLOCK(); 652 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 653 IFNET_WUNLOCK(); 654 655 if (domain_init_status >= 2) 656 if_attachdomain1(ifp); 657 658 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 659 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 660 661 /* Announce the interface. */ 662 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 663 664 if (ifp->if_watchdog != NULL) { 665 if_printf(ifp, 666 "WARNING: using obsoleted if_watchdog interface\n"); 667 668 /* 669 * Note that we need if_slowtimo(). If this happens after 670 * boot, then call if_slowtimo() directly. 671 */ 672 if (atomic_cmpset_int(&slowtimo_started, 0, 1) && !cold) 673 if_slowtimo(0); 674 } 675 } 676 677 static void 678 if_attachdomain(void *dummy) 679 { 680 INIT_VNET_NET(curvnet); 681 struct ifnet *ifp; 682 int s; 683 684 s = splnet(); 685 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 686 if_attachdomain1(ifp); 687 splx(s); 688 } 689 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 690 if_attachdomain, NULL); 691 692 static void 693 if_attachdomain1(struct ifnet *ifp) 694 { 695 struct domain *dp; 696 int s; 697 698 s = splnet(); 699 700 /* 701 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 702 * cannot lock ifp->if_afdata initialization, entirely. 703 */ 704 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 705 splx(s); 706 return; 707 } 708 if (ifp->if_afdata_initialized >= domain_init_status) { 709 IF_AFDATA_UNLOCK(ifp); 710 splx(s); 711 printf("if_attachdomain called more than once on %s\n", 712 ifp->if_xname); 713 return; 714 } 715 ifp->if_afdata_initialized = domain_init_status; 716 IF_AFDATA_UNLOCK(ifp); 717 718 /* address family dependent data region */ 719 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 720 for (dp = domains; dp; dp = dp->dom_next) { 721 if (dp->dom_ifattach) 722 ifp->if_afdata[dp->dom_family] = 723 (*dp->dom_ifattach)(ifp); 724 } 725 726 splx(s); 727 } 728 729 /* 730 * Remove any unicast or broadcast network addresses from an interface. 731 */ 732 void 733 if_purgeaddrs(struct ifnet *ifp) 734 { 735 struct ifaddr *ifa, *next; 736 737 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 738 if (ifa->ifa_addr->sa_family == AF_LINK) 739 continue; 740 #ifdef INET 741 /* XXX: Ugly!! ad hoc just for INET */ 742 if (ifa->ifa_addr->sa_family == AF_INET) { 743 struct ifaliasreq ifr; 744 745 bzero(&ifr, sizeof(ifr)); 746 ifr.ifra_addr = *ifa->ifa_addr; 747 if (ifa->ifa_dstaddr) 748 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 749 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 750 NULL) == 0) 751 continue; 752 } 753 #endif /* INET */ 754 #ifdef INET6 755 if (ifa->ifa_addr->sa_family == AF_INET6) { 756 in6_purgeaddr(ifa); 757 /* ifp_addrhead is already updated */ 758 continue; 759 } 760 #endif /* INET6 */ 761 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 762 IFAFREE(ifa); 763 } 764 } 765 766 /* 767 * Remove any multicast network addresses from an interface. 768 */ 769 void 770 if_purgemaddrs(struct ifnet *ifp) 771 { 772 struct ifmultiaddr *ifma; 773 struct ifmultiaddr *next; 774 775 IF_ADDR_LOCK(ifp); 776 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 777 if_delmulti_locked(ifp, ifma, 1); 778 IF_ADDR_UNLOCK(ifp); 779 } 780 781 /* 782 * Detach an interface, removing it from the 783 * list of "active" interfaces. 784 * 785 * XXXRW: There are some significant questions about event ordering, and 786 * how to prevent things from starting to use the interface during detach. 787 */ 788 void 789 if_detach(struct ifnet *ifp) 790 { 791 INIT_VNET_NET(ifp->if_vnet); 792 struct ifaddr *ifa; 793 struct radix_node_head *rnh; 794 int s, i, j; 795 struct domain *dp; 796 struct ifnet *iter; 797 int found = 0; 798 799 IFNET_WLOCK(); 800 TAILQ_FOREACH(iter, &V_ifnet, if_link) 801 if (iter == ifp) { 802 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 803 found = 1; 804 break; 805 } 806 IFNET_WUNLOCK(); 807 if (!found) 808 return; 809 810 /* 811 * Remove/wait for pending events. 812 */ 813 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 814 815 /* 816 * Remove routes and flush queues. 817 */ 818 s = splnet(); 819 if_down(ifp); 820 #ifdef ALTQ 821 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 822 altq_disable(&ifp->if_snd); 823 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 824 altq_detach(&ifp->if_snd); 825 #endif 826 827 if_purgeaddrs(ifp); 828 829 #ifdef INET 830 in_ifdetach(ifp); 831 #endif 832 833 #ifdef INET6 834 /* 835 * Remove all IPv6 kernel structs related to ifp. This should be done 836 * before removing routing entries below, since IPv6 interface direct 837 * routes are expected to be removed by the IPv6-specific kernel API. 838 * Otherwise, the kernel will detect some inconsistency and bark it. 839 */ 840 in6_ifdetach(ifp); 841 #endif 842 if_purgemaddrs(ifp); 843 844 /* 845 * Remove link ifaddr pointer and maybe decrement if_index. 846 * Clean up all addresses. 847 */ 848 ifp->if_addr = NULL; 849 destroy_dev(ifdev_byindex(ifp->if_index)); 850 ifdev_setbyindex(ifp->if_index, NULL); 851 852 /* We can now free link ifaddr. */ 853 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 854 ifa = TAILQ_FIRST(&ifp->if_addrhead); 855 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 856 IFAFREE(ifa); 857 } 858 859 /* 860 * Delete all remaining routes using this interface 861 * Unfortuneatly the only way to do this is to slog through 862 * the entire routing table looking for routes which point 863 * to this interface...oh well... 864 */ 865 for (i = 1; i <= AF_MAX; i++) { 866 for (j = 0; j < rt_numfibs; j++) { 867 if ((rnh = V_rt_tables[j][i]) == NULL) 868 continue; 869 RADIX_NODE_HEAD_LOCK(rnh); 870 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 871 RADIX_NODE_HEAD_UNLOCK(rnh); 872 } 873 } 874 875 /* Announce that the interface is gone. */ 876 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 877 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 878 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 879 880 IF_AFDATA_LOCK(ifp); 881 for (dp = domains; dp; dp = dp->dom_next) { 882 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 883 (*dp->dom_ifdetach)(ifp, 884 ifp->if_afdata[dp->dom_family]); 885 } 886 IF_AFDATA_UNLOCK(ifp); 887 888 #ifdef MAC 889 mac_ifnet_destroy(ifp); 890 #endif /* MAC */ 891 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 892 knlist_clear(&ifp->if_klist, 0); 893 knlist_destroy(&ifp->if_klist); 894 ifq_detach(&ifp->if_snd); 895 IF_AFDATA_DESTROY(ifp); 896 splx(s); 897 } 898 899 /* 900 * Add a group to an interface 901 */ 902 int 903 if_addgroup(struct ifnet *ifp, const char *groupname) 904 { 905 INIT_VNET_NET(ifp->if_vnet); 906 struct ifg_list *ifgl; 907 struct ifg_group *ifg = NULL; 908 struct ifg_member *ifgm; 909 910 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 911 groupname[strlen(groupname) - 1] <= '9') 912 return (EINVAL); 913 914 IFNET_WLOCK(); 915 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 916 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 917 IFNET_WUNLOCK(); 918 return (EEXIST); 919 } 920 921 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 922 M_NOWAIT)) == NULL) { 923 IFNET_WUNLOCK(); 924 return (ENOMEM); 925 } 926 927 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 928 M_TEMP, M_NOWAIT)) == NULL) { 929 free(ifgl, M_TEMP); 930 IFNET_WUNLOCK(); 931 return (ENOMEM); 932 } 933 934 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 935 if (!strcmp(ifg->ifg_group, groupname)) 936 break; 937 938 if (ifg == NULL) { 939 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 940 M_TEMP, M_NOWAIT)) == NULL) { 941 free(ifgl, M_TEMP); 942 free(ifgm, M_TEMP); 943 IFNET_WUNLOCK(); 944 return (ENOMEM); 945 } 946 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 947 ifg->ifg_refcnt = 0; 948 TAILQ_INIT(&ifg->ifg_members); 949 EVENTHANDLER_INVOKE(group_attach_event, ifg); 950 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 951 } 952 953 ifg->ifg_refcnt++; 954 ifgl->ifgl_group = ifg; 955 ifgm->ifgm_ifp = ifp; 956 957 IF_ADDR_LOCK(ifp); 958 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 959 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 960 IF_ADDR_UNLOCK(ifp); 961 962 IFNET_WUNLOCK(); 963 964 EVENTHANDLER_INVOKE(group_change_event, groupname); 965 966 return (0); 967 } 968 969 /* 970 * Remove a group from an interface 971 */ 972 int 973 if_delgroup(struct ifnet *ifp, const char *groupname) 974 { 975 INIT_VNET_NET(ifp->if_vnet); 976 struct ifg_list *ifgl; 977 struct ifg_member *ifgm; 978 979 IFNET_WLOCK(); 980 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 981 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 982 break; 983 if (ifgl == NULL) { 984 IFNET_WUNLOCK(); 985 return (ENOENT); 986 } 987 988 IF_ADDR_LOCK(ifp); 989 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 990 IF_ADDR_UNLOCK(ifp); 991 992 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 993 if (ifgm->ifgm_ifp == ifp) 994 break; 995 996 if (ifgm != NULL) { 997 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 998 free(ifgm, M_TEMP); 999 } 1000 1001 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1002 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1003 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1004 free(ifgl->ifgl_group, M_TEMP); 1005 } 1006 IFNET_WUNLOCK(); 1007 1008 free(ifgl, M_TEMP); 1009 1010 EVENTHANDLER_INVOKE(group_change_event, groupname); 1011 1012 return (0); 1013 } 1014 1015 /* 1016 * Stores all groups from an interface in memory pointed 1017 * to by data 1018 */ 1019 static int 1020 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1021 { 1022 int len, error; 1023 struct ifg_list *ifgl; 1024 struct ifg_req ifgrq, *ifgp; 1025 struct ifgroupreq *ifgr = data; 1026 1027 if (ifgr->ifgr_len == 0) { 1028 IF_ADDR_LOCK(ifp); 1029 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1030 ifgr->ifgr_len += sizeof(struct ifg_req); 1031 IF_ADDR_UNLOCK(ifp); 1032 return (0); 1033 } 1034 1035 len = ifgr->ifgr_len; 1036 ifgp = ifgr->ifgr_groups; 1037 /* XXX: wire */ 1038 IF_ADDR_LOCK(ifp); 1039 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1040 if (len < sizeof(ifgrq)) { 1041 IF_ADDR_UNLOCK(ifp); 1042 return (EINVAL); 1043 } 1044 bzero(&ifgrq, sizeof ifgrq); 1045 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1046 sizeof(ifgrq.ifgrq_group)); 1047 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1048 IF_ADDR_UNLOCK(ifp); 1049 return (error); 1050 } 1051 len -= sizeof(ifgrq); 1052 ifgp++; 1053 } 1054 IF_ADDR_UNLOCK(ifp); 1055 1056 return (0); 1057 } 1058 1059 /* 1060 * Stores all members of a group in memory pointed to by data 1061 */ 1062 static int 1063 if_getgroupmembers(struct ifgroupreq *data) 1064 { 1065 INIT_VNET_NET(curvnet); 1066 struct ifgroupreq *ifgr = data; 1067 struct ifg_group *ifg; 1068 struct ifg_member *ifgm; 1069 struct ifg_req ifgrq, *ifgp; 1070 int len, error; 1071 1072 IFNET_RLOCK(); 1073 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1074 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1075 break; 1076 if (ifg == NULL) { 1077 IFNET_RUNLOCK(); 1078 return (ENOENT); 1079 } 1080 1081 if (ifgr->ifgr_len == 0) { 1082 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1083 ifgr->ifgr_len += sizeof(ifgrq); 1084 IFNET_RUNLOCK(); 1085 return (0); 1086 } 1087 1088 len = ifgr->ifgr_len; 1089 ifgp = ifgr->ifgr_groups; 1090 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1091 if (len < sizeof(ifgrq)) { 1092 IFNET_RUNLOCK(); 1093 return (EINVAL); 1094 } 1095 bzero(&ifgrq, sizeof ifgrq); 1096 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1097 sizeof(ifgrq.ifgrq_member)); 1098 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1099 IFNET_RUNLOCK(); 1100 return (error); 1101 } 1102 len -= sizeof(ifgrq); 1103 ifgp++; 1104 } 1105 IFNET_RUNLOCK(); 1106 1107 return (0); 1108 } 1109 1110 /* 1111 * Delete Routes for a Network Interface 1112 * 1113 * Called for each routing entry via the rnh->rnh_walktree() call above 1114 * to delete all route entries referencing a detaching network interface. 1115 * 1116 * Arguments: 1117 * rn pointer to node in the routing table 1118 * arg argument passed to rnh->rnh_walktree() - detaching interface 1119 * 1120 * Returns: 1121 * 0 successful 1122 * errno failed - reason indicated 1123 * 1124 */ 1125 static int 1126 if_rtdel(struct radix_node *rn, void *arg) 1127 { 1128 struct rtentry *rt = (struct rtentry *)rn; 1129 struct ifnet *ifp = arg; 1130 int err; 1131 1132 if (rt->rt_ifp == ifp) { 1133 1134 /* 1135 * Protect (sorta) against walktree recursion problems 1136 * with cloned routes 1137 */ 1138 if ((rt->rt_flags & RTF_UP) == 0) 1139 return (0); 1140 1141 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1142 rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED, 1143 (struct rtentry **) NULL, rt->rt_fibnum); 1144 if (err) { 1145 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1146 } 1147 } 1148 1149 return (0); 1150 } 1151 1152 /* 1153 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1154 * structs used to represent other address families, it is necessary 1155 * to perform a different comparison. 1156 */ 1157 1158 #define sa_equal(a1, a2) \ 1159 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1160 1161 #define sa_dl_equal(a1, a2) \ 1162 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1163 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1164 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1165 LLADDR((struct sockaddr_dl *)(a2)), \ 1166 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1167 1168 /* 1169 * Locate an interface based on a complete address. 1170 */ 1171 /*ARGSUSED*/ 1172 struct ifaddr * 1173 ifa_ifwithaddr(struct sockaddr *addr) 1174 { 1175 INIT_VNET_NET(curvnet); 1176 struct ifnet *ifp; 1177 struct ifaddr *ifa; 1178 1179 IFNET_RLOCK(); 1180 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 1181 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1182 if (ifa->ifa_addr->sa_family != addr->sa_family) 1183 continue; 1184 if (sa_equal(addr, ifa->ifa_addr)) 1185 goto done; 1186 /* IP6 doesn't have broadcast */ 1187 if ((ifp->if_flags & IFF_BROADCAST) && 1188 ifa->ifa_broadaddr && 1189 ifa->ifa_broadaddr->sa_len != 0 && 1190 sa_equal(ifa->ifa_broadaddr, addr)) 1191 goto done; 1192 } 1193 ifa = NULL; 1194 done: 1195 IFNET_RUNLOCK(); 1196 return (ifa); 1197 } 1198 1199 /* 1200 * Locate an interface based on the broadcast address. 1201 */ 1202 /* ARGSUSED */ 1203 struct ifaddr * 1204 ifa_ifwithbroadaddr(struct sockaddr *addr) 1205 { 1206 INIT_VNET_NET(curvnet); 1207 struct ifnet *ifp; 1208 struct ifaddr *ifa; 1209 1210 IFNET_RLOCK(); 1211 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 1212 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1213 if (ifa->ifa_addr->sa_family != addr->sa_family) 1214 continue; 1215 if ((ifp->if_flags & IFF_BROADCAST) && 1216 ifa->ifa_broadaddr && 1217 ifa->ifa_broadaddr->sa_len != 0 && 1218 sa_equal(ifa->ifa_broadaddr, addr)) 1219 goto done; 1220 } 1221 ifa = NULL; 1222 done: 1223 IFNET_RUNLOCK(); 1224 return (ifa); 1225 } 1226 1227 /* 1228 * Locate the point to point interface with a given destination address. 1229 */ 1230 /*ARGSUSED*/ 1231 struct ifaddr * 1232 ifa_ifwithdstaddr(struct sockaddr *addr) 1233 { 1234 INIT_VNET_NET(curvnet); 1235 struct ifnet *ifp; 1236 struct ifaddr *ifa; 1237 1238 IFNET_RLOCK(); 1239 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1240 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1241 continue; 1242 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1243 if (ifa->ifa_addr->sa_family != addr->sa_family) 1244 continue; 1245 if (ifa->ifa_dstaddr != NULL && 1246 sa_equal(addr, ifa->ifa_dstaddr)) 1247 goto done; 1248 } 1249 } 1250 ifa = NULL; 1251 done: 1252 IFNET_RUNLOCK(); 1253 return (ifa); 1254 } 1255 1256 /* 1257 * Find an interface on a specific network. If many, choice 1258 * is most specific found. 1259 */ 1260 struct ifaddr * 1261 ifa_ifwithnet(struct sockaddr *addr) 1262 { 1263 INIT_VNET_NET(curvnet); 1264 struct ifnet *ifp; 1265 struct ifaddr *ifa; 1266 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 1267 u_int af = addr->sa_family; 1268 char *addr_data = addr->sa_data, *cplim; 1269 1270 /* 1271 * AF_LINK addresses can be looked up directly by their index number, 1272 * so do that if we can. 1273 */ 1274 if (af == AF_LINK) { 1275 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1276 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1277 return (ifaddr_byindex(sdl->sdl_index)); 1278 } 1279 1280 /* 1281 * Scan though each interface, looking for ones that have 1282 * addresses in this address family. 1283 */ 1284 IFNET_RLOCK(); 1285 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1286 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1287 char *cp, *cp2, *cp3; 1288 1289 if (ifa->ifa_addr->sa_family != af) 1290 next: continue; 1291 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 1292 /* 1293 * This is a bit broken as it doesn't 1294 * take into account that the remote end may 1295 * be a single node in the network we are 1296 * looking for. 1297 * The trouble is that we don't know the 1298 * netmask for the remote end. 1299 */ 1300 if (ifa->ifa_dstaddr != NULL && 1301 sa_equal(addr, ifa->ifa_dstaddr)) 1302 goto done; 1303 } else { 1304 /* 1305 * if we have a special address handler, 1306 * then use it instead of the generic one. 1307 */ 1308 if (ifa->ifa_claim_addr) { 1309 if ((*ifa->ifa_claim_addr)(ifa, addr)) 1310 goto done; 1311 continue; 1312 } 1313 1314 /* 1315 * Scan all the bits in the ifa's address. 1316 * If a bit dissagrees with what we are 1317 * looking for, mask it with the netmask 1318 * to see if it really matters. 1319 * (A byte at a time) 1320 */ 1321 if (ifa->ifa_netmask == 0) 1322 continue; 1323 cp = addr_data; 1324 cp2 = ifa->ifa_addr->sa_data; 1325 cp3 = ifa->ifa_netmask->sa_data; 1326 cplim = ifa->ifa_netmask->sa_len 1327 + (char *)ifa->ifa_netmask; 1328 while (cp3 < cplim) 1329 if ((*cp++ ^ *cp2++) & *cp3++) 1330 goto next; /* next address! */ 1331 /* 1332 * If the netmask of what we just found 1333 * is more specific than what we had before 1334 * (if we had one) then remember the new one 1335 * before continuing to search 1336 * for an even better one. 1337 */ 1338 if (ifa_maybe == 0 || 1339 rn_refines((caddr_t)ifa->ifa_netmask, 1340 (caddr_t)ifa_maybe->ifa_netmask)) 1341 ifa_maybe = ifa; 1342 } 1343 } 1344 } 1345 ifa = ifa_maybe; 1346 done: 1347 IFNET_RUNLOCK(); 1348 return (ifa); 1349 } 1350 1351 /* 1352 * Find an interface address specific to an interface best matching 1353 * a given address. 1354 */ 1355 struct ifaddr * 1356 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1357 { 1358 struct ifaddr *ifa; 1359 char *cp, *cp2, *cp3; 1360 char *cplim; 1361 struct ifaddr *ifa_maybe = 0; 1362 u_int af = addr->sa_family; 1363 1364 if (af >= AF_MAX) 1365 return (0); 1366 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1367 if (ifa->ifa_addr->sa_family != af) 1368 continue; 1369 if (ifa_maybe == 0) 1370 ifa_maybe = ifa; 1371 if (ifa->ifa_netmask == 0) { 1372 if (sa_equal(addr, ifa->ifa_addr) || 1373 (ifa->ifa_dstaddr && 1374 sa_equal(addr, ifa->ifa_dstaddr))) 1375 goto done; 1376 continue; 1377 } 1378 if (ifp->if_flags & IFF_POINTOPOINT) { 1379 if (sa_equal(addr, ifa->ifa_dstaddr)) 1380 goto done; 1381 } else { 1382 cp = addr->sa_data; 1383 cp2 = ifa->ifa_addr->sa_data; 1384 cp3 = ifa->ifa_netmask->sa_data; 1385 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1386 for (; cp3 < cplim; cp3++) 1387 if ((*cp++ ^ *cp2++) & *cp3) 1388 break; 1389 if (cp3 == cplim) 1390 goto done; 1391 } 1392 } 1393 ifa = ifa_maybe; 1394 done: 1395 return (ifa); 1396 } 1397 1398 #include <net/route.h> 1399 #include <net/if_llatbl.h> 1400 1401 /* 1402 * Default action when installing a route with a Link Level gateway. 1403 * Lookup an appropriate real ifa to point to. 1404 * This should be moved to /sys/net/link.c eventually. 1405 */ 1406 static void 1407 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1408 { 1409 struct ifaddr *ifa, *oifa; 1410 struct sockaddr *dst; 1411 struct ifnet *ifp; 1412 1413 RT_LOCK_ASSERT(rt); 1414 1415 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1416 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1417 return; 1418 ifa = ifaof_ifpforaddr(dst, ifp); 1419 if (ifa) { 1420 IFAREF(ifa); /* XXX */ 1421 oifa = rt->rt_ifa; 1422 rt->rt_ifa = ifa; 1423 IFAFREE(oifa); 1424 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1425 ifa->ifa_rtrequest(cmd, rt, info); 1426 } 1427 } 1428 1429 /* 1430 * Mark an interface down and notify protocols of 1431 * the transition. 1432 * NOTE: must be called at splnet or eqivalent. 1433 */ 1434 static void 1435 if_unroute(struct ifnet *ifp, int flag, int fam) 1436 { 1437 struct ifaddr *ifa; 1438 1439 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1440 1441 ifp->if_flags &= ~flag; 1442 getmicrotime(&ifp->if_lastchange); 1443 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1444 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1445 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1446 ifp->if_qflush(ifp); 1447 1448 #ifdef DEV_CARP 1449 if (ifp->if_carp) 1450 carp_carpdev_state(ifp->if_carp); 1451 #endif 1452 rt_ifmsg(ifp); 1453 } 1454 1455 /* 1456 * Mark an interface up and notify protocols of 1457 * the transition. 1458 * NOTE: must be called at splnet or eqivalent. 1459 */ 1460 static void 1461 if_route(struct ifnet *ifp, int flag, int fam) 1462 { 1463 struct ifaddr *ifa; 1464 1465 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1466 1467 ifp->if_flags |= flag; 1468 getmicrotime(&ifp->if_lastchange); 1469 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1470 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1471 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1472 #ifdef DEV_CARP 1473 if (ifp->if_carp) 1474 carp_carpdev_state(ifp->if_carp); 1475 #endif 1476 rt_ifmsg(ifp); 1477 #ifdef INET6 1478 in6_if_up(ifp); 1479 #endif 1480 } 1481 1482 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1483 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1484 1485 /* 1486 * Handle a change in the interface link state. To avoid LORs 1487 * between driver lock and upper layer locks, as well as possible 1488 * recursions, we post event to taskqueue, and all job 1489 * is done in static do_link_state_change(). 1490 */ 1491 void 1492 if_link_state_change(struct ifnet *ifp, int link_state) 1493 { 1494 /* Return if state hasn't changed. */ 1495 if (ifp->if_link_state == link_state) 1496 return; 1497 1498 ifp->if_link_state = link_state; 1499 1500 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1501 } 1502 1503 static void 1504 do_link_state_change(void *arg, int pending) 1505 { 1506 struct ifnet *ifp = (struct ifnet *)arg; 1507 int link_state = ifp->if_link_state; 1508 int link; 1509 CURVNET_SET(ifp->if_vnet); 1510 1511 /* Notify that the link state has changed. */ 1512 rt_ifmsg(ifp); 1513 if (link_state == LINK_STATE_UP) 1514 link = NOTE_LINKUP; 1515 else if (link_state == LINK_STATE_DOWN) 1516 link = NOTE_LINKDOWN; 1517 else 1518 link = NOTE_LINKINV; 1519 KNOTE_UNLOCKED(&ifp->if_klist, link); 1520 if (ifp->if_vlantrunk != NULL) 1521 (*vlan_link_state_p)(ifp, link); 1522 1523 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1524 IFP2AC(ifp)->ac_netgraph != NULL) 1525 (*ng_ether_link_state_p)(ifp, link_state); 1526 #ifdef DEV_CARP 1527 if (ifp->if_carp) 1528 carp_carpdev_state(ifp->if_carp); 1529 #endif 1530 if (ifp->if_bridge) { 1531 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1532 (*bstp_linkstate_p)(ifp, link_state); 1533 } 1534 if (ifp->if_lagg) { 1535 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1536 (*lagg_linkstate_p)(ifp, link_state); 1537 } 1538 1539 devctl_notify("IFNET", ifp->if_xname, 1540 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1541 if (pending > 1) 1542 if_printf(ifp, "%d link states coalesced\n", pending); 1543 if (log_link_state_change) 1544 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1545 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1546 CURVNET_RESTORE(); 1547 } 1548 1549 /* 1550 * Mark an interface down and notify protocols of 1551 * the transition. 1552 * NOTE: must be called at splnet or eqivalent. 1553 */ 1554 void 1555 if_down(struct ifnet *ifp) 1556 { 1557 1558 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1559 } 1560 1561 /* 1562 * Mark an interface up and notify protocols of 1563 * the transition. 1564 * NOTE: must be called at splnet or eqivalent. 1565 */ 1566 void 1567 if_up(struct ifnet *ifp) 1568 { 1569 1570 if_route(ifp, IFF_UP, AF_UNSPEC); 1571 } 1572 1573 /* 1574 * Flush an interface queue. 1575 */ 1576 static void 1577 if_qflush(struct ifnet *ifp) 1578 { 1579 struct mbuf *m, *n; 1580 struct ifaltq *ifq; 1581 1582 ifq = &ifp->if_snd; 1583 IFQ_LOCK(ifq); 1584 #ifdef ALTQ 1585 if (ALTQ_IS_ENABLED(ifq)) 1586 ALTQ_PURGE(ifq); 1587 #endif 1588 n = ifq->ifq_head; 1589 while ((m = n) != 0) { 1590 n = m->m_act; 1591 m_freem(m); 1592 } 1593 ifq->ifq_head = 0; 1594 ifq->ifq_tail = 0; 1595 ifq->ifq_len = 0; 1596 IFQ_UNLOCK(ifq); 1597 } 1598 1599 /* 1600 * Handle interface watchdog timer routines. Called 1601 * from softclock, we decrement timers (if set) and 1602 * call the appropriate interface routine on expiration. 1603 * 1604 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1605 * holding Giant. 1606 */ 1607 static void 1608 if_slowtimo(void *arg) 1609 { 1610 VNET_ITERATOR_DECL(vnet_iter); 1611 struct ifnet *ifp; 1612 int s = splimp(); 1613 1614 IFNET_RLOCK(); 1615 VNET_LIST_RLOCK(); 1616 VNET_FOREACH(vnet_iter) { 1617 CURVNET_SET(vnet_iter); 1618 INIT_VNET_NET(vnet_iter); 1619 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1620 if (ifp->if_timer == 0 || --ifp->if_timer) 1621 continue; 1622 if (ifp->if_watchdog) 1623 (*ifp->if_watchdog)(ifp); 1624 } 1625 CURVNET_RESTORE(); 1626 } 1627 VNET_LIST_RUNLOCK(); 1628 IFNET_RUNLOCK(); 1629 splx(s); 1630 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1631 } 1632 1633 /* 1634 * Map interface name to 1635 * interface structure pointer. 1636 */ 1637 struct ifnet * 1638 ifunit(const char *name) 1639 { 1640 INIT_VNET_NET(curvnet); 1641 struct ifnet *ifp; 1642 1643 IFNET_RLOCK(); 1644 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1645 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1646 break; 1647 } 1648 IFNET_RUNLOCK(); 1649 return (ifp); 1650 } 1651 1652 /* 1653 * Hardware specific interface ioctls. 1654 */ 1655 static int 1656 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1657 { 1658 struct ifreq *ifr; 1659 struct ifstat *ifs; 1660 int error = 0; 1661 int new_flags, temp_flags; 1662 size_t namelen, onamelen; 1663 char new_name[IFNAMSIZ]; 1664 struct ifaddr *ifa; 1665 struct sockaddr_dl *sdl; 1666 1667 ifr = (struct ifreq *)data; 1668 switch (cmd) { 1669 case SIOCGIFINDEX: 1670 ifr->ifr_index = ifp->if_index; 1671 break; 1672 1673 case SIOCGIFFLAGS: 1674 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1675 ifr->ifr_flags = temp_flags & 0xffff; 1676 ifr->ifr_flagshigh = temp_flags >> 16; 1677 break; 1678 1679 case SIOCGIFCAP: 1680 ifr->ifr_reqcap = ifp->if_capabilities; 1681 ifr->ifr_curcap = ifp->if_capenable; 1682 break; 1683 1684 #ifdef MAC 1685 case SIOCGIFMAC: 1686 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 1687 break; 1688 #endif 1689 1690 case SIOCGIFMETRIC: 1691 ifr->ifr_metric = ifp->if_metric; 1692 break; 1693 1694 case SIOCGIFMTU: 1695 ifr->ifr_mtu = ifp->if_mtu; 1696 break; 1697 1698 case SIOCGIFPHYS: 1699 ifr->ifr_phys = ifp->if_physical; 1700 break; 1701 1702 case SIOCSIFFLAGS: 1703 error = priv_check(td, PRIV_NET_SETIFFLAGS); 1704 if (error) 1705 return (error); 1706 /* 1707 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1708 * check, so we don't need special handling here yet. 1709 */ 1710 new_flags = (ifr->ifr_flags & 0xffff) | 1711 (ifr->ifr_flagshigh << 16); 1712 if (ifp->if_flags & IFF_SMART) { 1713 /* Smart drivers twiddle their own routes */ 1714 } else if (ifp->if_flags & IFF_UP && 1715 (new_flags & IFF_UP) == 0) { 1716 int s = splimp(); 1717 if_down(ifp); 1718 splx(s); 1719 } else if (new_flags & IFF_UP && 1720 (ifp->if_flags & IFF_UP) == 0) { 1721 int s = splimp(); 1722 if_up(ifp); 1723 splx(s); 1724 } 1725 /* See if permanently promiscuous mode bit is about to flip */ 1726 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 1727 if (new_flags & IFF_PPROMISC) 1728 ifp->if_flags |= IFF_PROMISC; 1729 else if (ifp->if_pcount == 0) 1730 ifp->if_flags &= ~IFF_PROMISC; 1731 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 1732 ifp->if_xname, 1733 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 1734 } 1735 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1736 (new_flags &~ IFF_CANTCHANGE); 1737 if (ifp->if_ioctl) { 1738 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1739 } 1740 getmicrotime(&ifp->if_lastchange); 1741 break; 1742 1743 case SIOCSIFCAP: 1744 error = priv_check(td, PRIV_NET_SETIFCAP); 1745 if (error) 1746 return (error); 1747 if (ifp->if_ioctl == NULL) 1748 return (EOPNOTSUPP); 1749 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1750 return (EINVAL); 1751 error = (*ifp->if_ioctl)(ifp, cmd, data); 1752 if (error == 0) 1753 getmicrotime(&ifp->if_lastchange); 1754 break; 1755 1756 #ifdef MAC 1757 case SIOCSIFMAC: 1758 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 1759 break; 1760 #endif 1761 1762 case SIOCSIFNAME: 1763 error = priv_check(td, PRIV_NET_SETIFNAME); 1764 if (error) 1765 return (error); 1766 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1767 if (error != 0) 1768 return (error); 1769 if (new_name[0] == '\0') 1770 return (EINVAL); 1771 if (ifunit(new_name) != NULL) 1772 return (EEXIST); 1773 1774 /* Announce the departure of the interface. */ 1775 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1776 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1777 1778 log(LOG_INFO, "%s: changing name to '%s'\n", 1779 ifp->if_xname, new_name); 1780 1781 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1782 ifa = ifp->if_addr; 1783 IFA_LOCK(ifa); 1784 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1785 namelen = strlen(new_name); 1786 onamelen = sdl->sdl_nlen; 1787 /* 1788 * Move the address if needed. This is safe because we 1789 * allocate space for a name of length IFNAMSIZ when we 1790 * create this in if_attach(). 1791 */ 1792 if (namelen != onamelen) { 1793 bcopy(sdl->sdl_data + onamelen, 1794 sdl->sdl_data + namelen, sdl->sdl_alen); 1795 } 1796 bcopy(new_name, sdl->sdl_data, namelen); 1797 sdl->sdl_nlen = namelen; 1798 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1799 bzero(sdl->sdl_data, onamelen); 1800 while (namelen != 0) 1801 sdl->sdl_data[--namelen] = 0xff; 1802 IFA_UNLOCK(ifa); 1803 1804 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1805 /* Announce the return of the interface. */ 1806 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1807 break; 1808 1809 case SIOCSIFMETRIC: 1810 error = priv_check(td, PRIV_NET_SETIFMETRIC); 1811 if (error) 1812 return (error); 1813 ifp->if_metric = ifr->ifr_metric; 1814 getmicrotime(&ifp->if_lastchange); 1815 break; 1816 1817 case SIOCSIFPHYS: 1818 error = priv_check(td, PRIV_NET_SETIFPHYS); 1819 if (error) 1820 return (error); 1821 if (ifp->if_ioctl == NULL) 1822 return (EOPNOTSUPP); 1823 error = (*ifp->if_ioctl)(ifp, cmd, data); 1824 if (error == 0) 1825 getmicrotime(&ifp->if_lastchange); 1826 break; 1827 1828 case SIOCSIFMTU: 1829 { 1830 u_long oldmtu = ifp->if_mtu; 1831 1832 error = priv_check(td, PRIV_NET_SETIFMTU); 1833 if (error) 1834 return (error); 1835 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1836 return (EINVAL); 1837 if (ifp->if_ioctl == NULL) 1838 return (EOPNOTSUPP); 1839 error = (*ifp->if_ioctl)(ifp, cmd, data); 1840 if (error == 0) { 1841 getmicrotime(&ifp->if_lastchange); 1842 rt_ifmsg(ifp); 1843 } 1844 /* 1845 * If the link MTU changed, do network layer specific procedure. 1846 */ 1847 if (ifp->if_mtu != oldmtu) { 1848 #ifdef INET6 1849 nd6_setmtu(ifp); 1850 #endif 1851 } 1852 break; 1853 } 1854 1855 case SIOCADDMULTI: 1856 case SIOCDELMULTI: 1857 if (cmd == SIOCADDMULTI) 1858 error = priv_check(td, PRIV_NET_ADDMULTI); 1859 else 1860 error = priv_check(td, PRIV_NET_DELMULTI); 1861 if (error) 1862 return (error); 1863 1864 /* Don't allow group membership on non-multicast interfaces. */ 1865 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1866 return (EOPNOTSUPP); 1867 1868 /* Don't let users screw up protocols' entries. */ 1869 if (ifr->ifr_addr.sa_family != AF_LINK) 1870 return (EINVAL); 1871 1872 if (cmd == SIOCADDMULTI) { 1873 struct ifmultiaddr *ifma; 1874 1875 /* 1876 * Userland is only permitted to join groups once 1877 * via the if_addmulti() KPI, because it cannot hold 1878 * struct ifmultiaddr * between calls. It may also 1879 * lose a race while we check if the membership 1880 * already exists. 1881 */ 1882 IF_ADDR_LOCK(ifp); 1883 ifma = if_findmulti(ifp, &ifr->ifr_addr); 1884 IF_ADDR_UNLOCK(ifp); 1885 if (ifma != NULL) 1886 error = EADDRINUSE; 1887 else 1888 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1889 } else { 1890 error = if_delmulti(ifp, &ifr->ifr_addr); 1891 } 1892 if (error == 0) 1893 getmicrotime(&ifp->if_lastchange); 1894 break; 1895 1896 case SIOCSIFPHYADDR: 1897 case SIOCDIFPHYADDR: 1898 #ifdef INET6 1899 case SIOCSIFPHYADDR_IN6: 1900 #endif 1901 case SIOCSLIFPHYADDR: 1902 case SIOCSIFMEDIA: 1903 case SIOCSIFGENERIC: 1904 error = priv_check(td, PRIV_NET_HWIOCTL); 1905 if (error) 1906 return (error); 1907 if (ifp->if_ioctl == NULL) 1908 return (EOPNOTSUPP); 1909 error = (*ifp->if_ioctl)(ifp, cmd, data); 1910 if (error == 0) 1911 getmicrotime(&ifp->if_lastchange); 1912 break; 1913 1914 case SIOCGIFSTATUS: 1915 ifs = (struct ifstat *)data; 1916 ifs->ascii[0] = '\0'; 1917 1918 case SIOCGIFPSRCADDR: 1919 case SIOCGIFPDSTADDR: 1920 case SIOCGLIFPHYADDR: 1921 case SIOCGIFMEDIA: 1922 case SIOCGIFGENERIC: 1923 if (ifp->if_ioctl == NULL) 1924 return (EOPNOTSUPP); 1925 error = (*ifp->if_ioctl)(ifp, cmd, data); 1926 break; 1927 1928 case SIOCSIFLLADDR: 1929 error = priv_check(td, PRIV_NET_SETLLADDR); 1930 if (error) 1931 return (error); 1932 error = if_setlladdr(ifp, 1933 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1934 break; 1935 1936 case SIOCAIFGROUP: 1937 { 1938 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1939 1940 error = priv_check(td, PRIV_NET_ADDIFGROUP); 1941 if (error) 1942 return (error); 1943 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 1944 return (error); 1945 break; 1946 } 1947 1948 case SIOCGIFGROUP: 1949 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 1950 return (error); 1951 break; 1952 1953 case SIOCDIFGROUP: 1954 { 1955 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1956 1957 error = priv_check(td, PRIV_NET_DELIFGROUP); 1958 if (error) 1959 return (error); 1960 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 1961 return (error); 1962 break; 1963 } 1964 1965 default: 1966 error = ENOIOCTL; 1967 break; 1968 } 1969 return (error); 1970 } 1971 1972 /* 1973 * Interface ioctls. 1974 */ 1975 int 1976 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1977 { 1978 struct ifnet *ifp; 1979 struct ifreq *ifr; 1980 int error; 1981 int oif_flags; 1982 1983 switch (cmd) { 1984 case SIOCGIFCONF: 1985 case OSIOCGIFCONF: 1986 #ifdef __amd64__ 1987 case SIOCGIFCONF32: 1988 #endif 1989 return (ifconf(cmd, data)); 1990 } 1991 ifr = (struct ifreq *)data; 1992 1993 switch (cmd) { 1994 case SIOCIFCREATE: 1995 case SIOCIFCREATE2: 1996 error = priv_check(td, PRIV_NET_IFCREATE); 1997 if (error) 1998 return (error); 1999 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 2000 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 2001 case SIOCIFDESTROY: 2002 error = priv_check(td, PRIV_NET_IFDESTROY); 2003 if (error) 2004 return (error); 2005 return if_clone_destroy(ifr->ifr_name); 2006 2007 case SIOCIFGCLONERS: 2008 return (if_clone_list((struct if_clonereq *)data)); 2009 case SIOCGIFGMEMB: 2010 return (if_getgroupmembers((struct ifgroupreq *)data)); 2011 } 2012 2013 ifp = ifunit(ifr->ifr_name); 2014 if (ifp == 0) 2015 return (ENXIO); 2016 2017 error = ifhwioctl(cmd, ifp, data, td); 2018 if (error != ENOIOCTL) 2019 return (error); 2020 2021 oif_flags = ifp->if_flags; 2022 if (so->so_proto == 0) 2023 return (EOPNOTSUPP); 2024 #ifndef COMPAT_43 2025 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2026 data, 2027 ifp, td)); 2028 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2029 error = (*ifp->if_ioctl)(ifp, cmd, data); 2030 #else 2031 { 2032 int ocmd = cmd; 2033 2034 switch (cmd) { 2035 2036 case SIOCSIFDSTADDR: 2037 case SIOCSIFADDR: 2038 case SIOCSIFBRDADDR: 2039 case SIOCSIFNETMASK: 2040 #if BYTE_ORDER != BIG_ENDIAN 2041 if (ifr->ifr_addr.sa_family == 0 && 2042 ifr->ifr_addr.sa_len < 16) { 2043 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2044 ifr->ifr_addr.sa_len = 16; 2045 } 2046 #else 2047 if (ifr->ifr_addr.sa_len == 0) 2048 ifr->ifr_addr.sa_len = 16; 2049 #endif 2050 break; 2051 2052 case OSIOCGIFADDR: 2053 cmd = SIOCGIFADDR; 2054 break; 2055 2056 case OSIOCGIFDSTADDR: 2057 cmd = SIOCGIFDSTADDR; 2058 break; 2059 2060 case OSIOCGIFBRDADDR: 2061 cmd = SIOCGIFBRDADDR; 2062 break; 2063 2064 case OSIOCGIFNETMASK: 2065 cmd = SIOCGIFNETMASK; 2066 } 2067 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2068 cmd, 2069 data, 2070 ifp, td)); 2071 if (error == EOPNOTSUPP && ifp != NULL && 2072 ifp->if_ioctl != NULL) 2073 error = (*ifp->if_ioctl)(ifp, cmd, data); 2074 switch (ocmd) { 2075 2076 case OSIOCGIFADDR: 2077 case OSIOCGIFDSTADDR: 2078 case OSIOCGIFBRDADDR: 2079 case OSIOCGIFNETMASK: 2080 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2081 2082 } 2083 } 2084 #endif /* COMPAT_43 */ 2085 2086 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2087 #ifdef INET6 2088 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 2089 if (ifp->if_flags & IFF_UP) { 2090 int s = splimp(); 2091 in6_if_up(ifp); 2092 splx(s); 2093 } 2094 #endif 2095 } 2096 return (error); 2097 } 2098 2099 /* 2100 * The code common to handling reference counted flags, 2101 * e.g., in ifpromisc() and if_allmulti(). 2102 * The "pflag" argument can specify a permanent mode flag to check, 2103 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2104 * 2105 * Only to be used on stack-owned flags, not driver-owned flags. 2106 */ 2107 static int 2108 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2109 { 2110 struct ifreq ifr; 2111 int error; 2112 int oldflags, oldcount; 2113 2114 /* Sanity checks to catch programming errors */ 2115 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2116 ("%s: setting driver-owned flag %d", __func__, flag)); 2117 2118 if (onswitch) 2119 KASSERT(*refcount >= 0, 2120 ("%s: increment negative refcount %d for flag %d", 2121 __func__, *refcount, flag)); 2122 else 2123 KASSERT(*refcount > 0, 2124 ("%s: decrement non-positive refcount %d for flag %d", 2125 __func__, *refcount, flag)); 2126 2127 /* In case this mode is permanent, just touch refcount */ 2128 if (ifp->if_flags & pflag) { 2129 *refcount += onswitch ? 1 : -1; 2130 return (0); 2131 } 2132 2133 /* Save ifnet parameters for if_ioctl() may fail */ 2134 oldcount = *refcount; 2135 oldflags = ifp->if_flags; 2136 2137 /* 2138 * See if we aren't the only and touching refcount is enough. 2139 * Actually toggle interface flag if we are the first or last. 2140 */ 2141 if (onswitch) { 2142 if ((*refcount)++) 2143 return (0); 2144 ifp->if_flags |= flag; 2145 } else { 2146 if (--(*refcount)) 2147 return (0); 2148 ifp->if_flags &= ~flag; 2149 } 2150 2151 /* Call down the driver since we've changed interface flags */ 2152 if (ifp->if_ioctl == NULL) { 2153 error = EOPNOTSUPP; 2154 goto recover; 2155 } 2156 ifr.ifr_flags = ifp->if_flags & 0xffff; 2157 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2158 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2159 if (error) 2160 goto recover; 2161 /* Notify userland that interface flags have changed */ 2162 rt_ifmsg(ifp); 2163 return (0); 2164 2165 recover: 2166 /* Recover after driver error */ 2167 *refcount = oldcount; 2168 ifp->if_flags = oldflags; 2169 return (error); 2170 } 2171 2172 /* 2173 * Set/clear promiscuous mode on interface ifp based on the truth value 2174 * of pswitch. The calls are reference counted so that only the first 2175 * "on" request actually has an effect, as does the final "off" request. 2176 * Results are undefined if the "off" and "on" requests are not matched. 2177 */ 2178 int 2179 ifpromisc(struct ifnet *ifp, int pswitch) 2180 { 2181 int error; 2182 int oldflags = ifp->if_flags; 2183 2184 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2185 &ifp->if_pcount, pswitch); 2186 /* If promiscuous mode status has changed, log a message */ 2187 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2188 log(LOG_INFO, "%s: promiscuous mode %s\n", 2189 ifp->if_xname, 2190 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2191 return (error); 2192 } 2193 2194 /* 2195 * Return interface configuration 2196 * of system. List may be used 2197 * in later ioctl's (above) to get 2198 * other information. 2199 */ 2200 /*ARGSUSED*/ 2201 static int 2202 ifconf(u_long cmd, caddr_t data) 2203 { 2204 INIT_VNET_NET(curvnet); 2205 struct ifconf *ifc = (struct ifconf *)data; 2206 #ifdef __amd64__ 2207 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 2208 struct ifconf ifc_swab; 2209 #endif 2210 struct ifnet *ifp; 2211 struct ifaddr *ifa; 2212 struct ifreq ifr; 2213 struct sbuf *sb; 2214 int error, full = 0, valid_len, max_len; 2215 2216 #ifdef __amd64__ 2217 if (cmd == SIOCGIFCONF32) { 2218 ifc_swab.ifc_len = ifc32->ifc_len; 2219 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 2220 ifc = &ifc_swab; 2221 } 2222 #endif 2223 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2224 max_len = MAXPHYS - 1; 2225 2226 /* Prevent hostile input from being able to crash the system */ 2227 if (ifc->ifc_len <= 0) 2228 return (EINVAL); 2229 2230 again: 2231 if (ifc->ifc_len <= max_len) { 2232 max_len = ifc->ifc_len; 2233 full = 1; 2234 } 2235 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2236 max_len = 0; 2237 valid_len = 0; 2238 2239 IFNET_RLOCK(); /* could sleep XXX */ 2240 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2241 int addrs; 2242 2243 /* 2244 * Zero the ifr_name buffer to make sure we don't 2245 * disclose the contents of the stack. 2246 */ 2247 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2248 2249 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2250 >= sizeof(ifr.ifr_name)) { 2251 sbuf_delete(sb); 2252 IFNET_RUNLOCK(); 2253 return (ENAMETOOLONG); 2254 } 2255 2256 addrs = 0; 2257 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2258 struct sockaddr *sa = ifa->ifa_addr; 2259 2260 if (prison_if(curthread->td_ucred, sa) != 0) 2261 continue; 2262 addrs++; 2263 #ifdef COMPAT_43 2264 if (cmd == OSIOCGIFCONF) { 2265 struct osockaddr *osa = 2266 (struct osockaddr *)&ifr.ifr_addr; 2267 ifr.ifr_addr = *sa; 2268 osa->sa_family = sa->sa_family; 2269 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2270 max_len += sizeof(ifr); 2271 } else 2272 #endif 2273 if (sa->sa_len <= sizeof(*sa)) { 2274 ifr.ifr_addr = *sa; 2275 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2276 max_len += sizeof(ifr); 2277 } else { 2278 sbuf_bcat(sb, &ifr, 2279 offsetof(struct ifreq, ifr_addr)); 2280 max_len += offsetof(struct ifreq, ifr_addr); 2281 sbuf_bcat(sb, sa, sa->sa_len); 2282 max_len += sa->sa_len; 2283 } 2284 2285 if (!sbuf_overflowed(sb)) 2286 valid_len = sbuf_len(sb); 2287 } 2288 if (addrs == 0) { 2289 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2290 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2291 max_len += sizeof(ifr); 2292 2293 if (!sbuf_overflowed(sb)) 2294 valid_len = sbuf_len(sb); 2295 } 2296 } 2297 IFNET_RUNLOCK(); 2298 2299 /* 2300 * If we didn't allocate enough space (uncommon), try again. If 2301 * we have already allocated as much space as we are allowed, 2302 * return what we've got. 2303 */ 2304 if (valid_len != max_len && !full) { 2305 sbuf_delete(sb); 2306 goto again; 2307 } 2308 2309 ifc->ifc_len = valid_len; 2310 #ifdef __amd64__ 2311 if (cmd == SIOCGIFCONF32) 2312 ifc32->ifc_len = valid_len; 2313 #endif 2314 sbuf_finish(sb); 2315 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2316 sbuf_delete(sb); 2317 return (error); 2318 } 2319 2320 /* 2321 * Just like ifpromisc(), but for all-multicast-reception mode. 2322 */ 2323 int 2324 if_allmulti(struct ifnet *ifp, int onswitch) 2325 { 2326 2327 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2328 } 2329 2330 struct ifmultiaddr * 2331 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2332 { 2333 struct ifmultiaddr *ifma; 2334 2335 IF_ADDR_LOCK_ASSERT(ifp); 2336 2337 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2338 if (sa->sa_family == AF_LINK) { 2339 if (sa_dl_equal(ifma->ifma_addr, sa)) 2340 break; 2341 } else { 2342 if (sa_equal(ifma->ifma_addr, sa)) 2343 break; 2344 } 2345 } 2346 2347 return ifma; 2348 } 2349 2350 /* 2351 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2352 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2353 * the ifnet multicast address list here, so the caller must do that and 2354 * other setup work (such as notifying the device driver). The reference 2355 * count is initialized to 1. 2356 */ 2357 static struct ifmultiaddr * 2358 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2359 int mflags) 2360 { 2361 struct ifmultiaddr *ifma; 2362 struct sockaddr *dupsa; 2363 2364 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2365 M_ZERO); 2366 if (ifma == NULL) 2367 return (NULL); 2368 2369 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2370 if (dupsa == NULL) { 2371 free(ifma, M_IFMADDR); 2372 return (NULL); 2373 } 2374 bcopy(sa, dupsa, sa->sa_len); 2375 ifma->ifma_addr = dupsa; 2376 2377 ifma->ifma_ifp = ifp; 2378 ifma->ifma_refcount = 1; 2379 ifma->ifma_protospec = NULL; 2380 2381 if (llsa == NULL) { 2382 ifma->ifma_lladdr = NULL; 2383 return (ifma); 2384 } 2385 2386 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2387 if (dupsa == NULL) { 2388 free(ifma->ifma_addr, M_IFMADDR); 2389 free(ifma, M_IFMADDR); 2390 return (NULL); 2391 } 2392 bcopy(llsa, dupsa, llsa->sa_len); 2393 ifma->ifma_lladdr = dupsa; 2394 2395 return (ifma); 2396 } 2397 2398 /* 2399 * if_freemulti: free ifmultiaddr structure and possibly attached related 2400 * addresses. The caller is responsible for implementing reference 2401 * counting, notifying the driver, handling routing messages, and releasing 2402 * any dependent link layer state. 2403 */ 2404 static void 2405 if_freemulti(struct ifmultiaddr *ifma) 2406 { 2407 2408 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2409 ifma->ifma_refcount)); 2410 KASSERT(ifma->ifma_protospec == NULL, 2411 ("if_freemulti: protospec not NULL")); 2412 2413 if (ifma->ifma_lladdr != NULL) 2414 free(ifma->ifma_lladdr, M_IFMADDR); 2415 free(ifma->ifma_addr, M_IFMADDR); 2416 free(ifma, M_IFMADDR); 2417 } 2418 2419 /* 2420 * Register an additional multicast address with a network interface. 2421 * 2422 * - If the address is already present, bump the reference count on the 2423 * address and return. 2424 * - If the address is not link-layer, look up a link layer address. 2425 * - Allocate address structures for one or both addresses, and attach to the 2426 * multicast address list on the interface. If automatically adding a link 2427 * layer address, the protocol address will own a reference to the link 2428 * layer address, to be freed when it is freed. 2429 * - Notify the network device driver of an addition to the multicast address 2430 * list. 2431 * 2432 * 'sa' points to caller-owned memory with the desired multicast address. 2433 * 2434 * 'retifma' will be used to return a pointer to the resulting multicast 2435 * address reference, if desired. 2436 */ 2437 int 2438 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2439 struct ifmultiaddr **retifma) 2440 { 2441 struct ifmultiaddr *ifma, *ll_ifma; 2442 struct sockaddr *llsa; 2443 int error; 2444 2445 /* 2446 * If the address is already present, return a new reference to it; 2447 * otherwise, allocate storage and set up a new address. 2448 */ 2449 IF_ADDR_LOCK(ifp); 2450 ifma = if_findmulti(ifp, sa); 2451 if (ifma != NULL) { 2452 ifma->ifma_refcount++; 2453 if (retifma != NULL) 2454 *retifma = ifma; 2455 IF_ADDR_UNLOCK(ifp); 2456 return (0); 2457 } 2458 2459 /* 2460 * The address isn't already present; resolve the protocol address 2461 * into a link layer address, and then look that up, bump its 2462 * refcount or allocate an ifma for that also. If 'llsa' was 2463 * returned, we will need to free it later. 2464 */ 2465 llsa = NULL; 2466 ll_ifma = NULL; 2467 if (ifp->if_resolvemulti != NULL) { 2468 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2469 if (error) 2470 goto unlock_out; 2471 } 2472 2473 /* 2474 * Allocate the new address. Don't hook it up yet, as we may also 2475 * need to allocate a link layer multicast address. 2476 */ 2477 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2478 if (ifma == NULL) { 2479 error = ENOMEM; 2480 goto free_llsa_out; 2481 } 2482 2483 /* 2484 * If a link layer address is found, we'll need to see if it's 2485 * already present in the address list, or allocate is as well. 2486 * When this block finishes, the link layer address will be on the 2487 * list. 2488 */ 2489 if (llsa != NULL) { 2490 ll_ifma = if_findmulti(ifp, llsa); 2491 if (ll_ifma == NULL) { 2492 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2493 if (ll_ifma == NULL) { 2494 --ifma->ifma_refcount; 2495 if_freemulti(ifma); 2496 error = ENOMEM; 2497 goto free_llsa_out; 2498 } 2499 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2500 ifma_link); 2501 } else 2502 ll_ifma->ifma_refcount++; 2503 ifma->ifma_llifma = ll_ifma; 2504 } 2505 2506 /* 2507 * We now have a new multicast address, ifma, and possibly a new or 2508 * referenced link layer address. Add the primary address to the 2509 * ifnet address list. 2510 */ 2511 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2512 2513 if (retifma != NULL) 2514 *retifma = ifma; 2515 2516 /* 2517 * Must generate the message while holding the lock so that 'ifma' 2518 * pointer is still valid. 2519 */ 2520 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2521 IF_ADDR_UNLOCK(ifp); 2522 2523 /* 2524 * We are certain we have added something, so call down to the 2525 * interface to let them know about it. 2526 */ 2527 if (ifp->if_ioctl != NULL) { 2528 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2529 } 2530 2531 if (llsa != NULL) 2532 free(llsa, M_IFMADDR); 2533 2534 return (0); 2535 2536 free_llsa_out: 2537 if (llsa != NULL) 2538 free(llsa, M_IFMADDR); 2539 2540 unlock_out: 2541 IF_ADDR_UNLOCK(ifp); 2542 return (error); 2543 } 2544 2545 /* 2546 * Delete a multicast group membership by network-layer group address. 2547 * 2548 * Returns ENOENT if the entry could not be found. If ifp no longer 2549 * exists, results are undefined. This entry point should only be used 2550 * from subsystems which do appropriate locking to hold ifp for the 2551 * duration of the call. 2552 * Network-layer protocol domains must use if_delmulti_ifma(). 2553 */ 2554 int 2555 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2556 { 2557 struct ifmultiaddr *ifma; 2558 int lastref; 2559 #ifdef INVARIANTS 2560 struct ifnet *oifp; 2561 INIT_VNET_NET(ifp->if_vnet); 2562 2563 IFNET_RLOCK(); 2564 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 2565 if (ifp == oifp) 2566 break; 2567 if (ifp != oifp) 2568 ifp = NULL; 2569 IFNET_RUNLOCK(); 2570 2571 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 2572 #endif 2573 if (ifp == NULL) 2574 return (ENOENT); 2575 2576 IF_ADDR_LOCK(ifp); 2577 lastref = 0; 2578 ifma = if_findmulti(ifp, sa); 2579 if (ifma != NULL) 2580 lastref = if_delmulti_locked(ifp, ifma, 0); 2581 IF_ADDR_UNLOCK(ifp); 2582 2583 if (ifma == NULL) 2584 return (ENOENT); 2585 2586 if (lastref && ifp->if_ioctl != NULL) { 2587 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2588 } 2589 2590 return (0); 2591 } 2592 2593 /* 2594 * Delete a multicast group membership by group membership pointer. 2595 * Network-layer protocol domains must use this routine. 2596 * 2597 * It is safe to call this routine if the ifp disappeared. 2598 */ 2599 void 2600 if_delmulti_ifma(struct ifmultiaddr *ifma) 2601 { 2602 #ifdef DIAGNOSTIC 2603 INIT_VNET_NET(curvnet); 2604 #endif 2605 struct ifnet *ifp; 2606 int lastref; 2607 2608 ifp = ifma->ifma_ifp; 2609 #ifdef DIAGNOSTIC 2610 if (ifp == NULL) { 2611 printf("%s: ifma_ifp seems to be detached\n", __func__); 2612 } else { 2613 struct ifnet *oifp; 2614 2615 IFNET_RLOCK(); 2616 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 2617 if (ifp == oifp) 2618 break; 2619 if (ifp != oifp) { 2620 printf("%s: ifnet %p disappeared\n", __func__, ifp); 2621 ifp = NULL; 2622 } 2623 IFNET_RUNLOCK(); 2624 } 2625 #endif 2626 /* 2627 * If and only if the ifnet instance exists: Acquire the address lock. 2628 */ 2629 if (ifp != NULL) 2630 IF_ADDR_LOCK(ifp); 2631 2632 lastref = if_delmulti_locked(ifp, ifma, 0); 2633 2634 if (ifp != NULL) { 2635 /* 2636 * If and only if the ifnet instance exists: 2637 * Release the address lock. 2638 * If the group was left: update the hardware hash filter. 2639 */ 2640 IF_ADDR_UNLOCK(ifp); 2641 if (lastref && ifp->if_ioctl != NULL) { 2642 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2643 } 2644 } 2645 } 2646 2647 /* 2648 * Perform deletion of network-layer and/or link-layer multicast address. 2649 * 2650 * Return 0 if the reference count was decremented. 2651 * Return 1 if the final reference was released, indicating that the 2652 * hardware hash filter should be reprogrammed. 2653 */ 2654 static int 2655 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 2656 { 2657 struct ifmultiaddr *ll_ifma; 2658 2659 if (ifp != NULL && ifma->ifma_ifp != NULL) { 2660 KASSERT(ifma->ifma_ifp == ifp, 2661 ("%s: inconsistent ifp %p", __func__, ifp)); 2662 IF_ADDR_LOCK_ASSERT(ifp); 2663 } 2664 2665 ifp = ifma->ifma_ifp; 2666 2667 /* 2668 * If the ifnet is detaching, null out references to ifnet, 2669 * so that upper protocol layers will notice, and not attempt 2670 * to obtain locks for an ifnet which no longer exists. The 2671 * routing socket announcement must happen before the ifnet 2672 * instance is detached from the system. 2673 */ 2674 if (detaching) { 2675 #ifdef DIAGNOSTIC 2676 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 2677 #endif 2678 /* 2679 * ifp may already be nulled out if we are being reentered 2680 * to delete the ll_ifma. 2681 */ 2682 if (ifp != NULL) { 2683 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2684 ifma->ifma_ifp = NULL; 2685 } 2686 } 2687 2688 if (--ifma->ifma_refcount > 0) 2689 return 0; 2690 2691 /* 2692 * If this ifma is a network-layer ifma, a link-layer ifma may 2693 * have been associated with it. Release it first if so. 2694 */ 2695 ll_ifma = ifma->ifma_llifma; 2696 if (ll_ifma != NULL) { 2697 KASSERT(ifma->ifma_lladdr != NULL, 2698 ("%s: llifma w/o lladdr", __func__)); 2699 if (detaching) 2700 ll_ifma->ifma_ifp = NULL; /* XXX */ 2701 if (--ll_ifma->ifma_refcount == 0) { 2702 if (ifp != NULL) { 2703 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 2704 ifma_link); 2705 } 2706 if_freemulti(ll_ifma); 2707 } 2708 } 2709 2710 if (ifp != NULL) 2711 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2712 2713 if_freemulti(ifma); 2714 2715 /* 2716 * The last reference to this instance of struct ifmultiaddr 2717 * was released; the hardware should be notified of this change. 2718 */ 2719 return 1; 2720 } 2721 2722 /* 2723 * Set the link layer address on an interface. 2724 * 2725 * At this time we only support certain types of interfaces, 2726 * and we don't allow the length of the address to change. 2727 */ 2728 int 2729 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2730 { 2731 struct sockaddr_dl *sdl; 2732 struct ifaddr *ifa; 2733 struct ifreq ifr; 2734 2735 ifa = ifp->if_addr; 2736 if (ifa == NULL) 2737 return (EINVAL); 2738 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2739 if (sdl == NULL) 2740 return (EINVAL); 2741 if (len != sdl->sdl_alen) /* don't allow length to change */ 2742 return (EINVAL); 2743 switch (ifp->if_type) { 2744 case IFT_ETHER: 2745 case IFT_FDDI: 2746 case IFT_XETHER: 2747 case IFT_ISO88025: 2748 case IFT_L2VLAN: 2749 case IFT_BRIDGE: 2750 case IFT_ARCNET: 2751 case IFT_IEEE8023ADLAG: 2752 case IFT_IEEE80211: 2753 bcopy(lladdr, LLADDR(sdl), len); 2754 break; 2755 default: 2756 return (ENODEV); 2757 } 2758 /* 2759 * If the interface is already up, we need 2760 * to re-init it in order to reprogram its 2761 * address filter. 2762 */ 2763 if ((ifp->if_flags & IFF_UP) != 0) { 2764 if (ifp->if_ioctl) { 2765 ifp->if_flags &= ~IFF_UP; 2766 ifr.ifr_flags = ifp->if_flags & 0xffff; 2767 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2768 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2769 ifp->if_flags |= IFF_UP; 2770 ifr.ifr_flags = ifp->if_flags & 0xffff; 2771 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2772 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2773 } 2774 #ifdef INET 2775 /* 2776 * Also send gratuitous ARPs to notify other nodes about 2777 * the address change. 2778 */ 2779 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2780 if (ifa->ifa_addr->sa_family == AF_INET) 2781 arp_ifinit(ifp, ifa); 2782 } 2783 #endif 2784 } 2785 return (0); 2786 } 2787 2788 /* 2789 * The name argument must be a pointer to storage which will last as 2790 * long as the interface does. For physical devices, the result of 2791 * device_get_name(dev) is a good choice and for pseudo-devices a 2792 * static string works well. 2793 */ 2794 void 2795 if_initname(struct ifnet *ifp, const char *name, int unit) 2796 { 2797 ifp->if_dname = name; 2798 ifp->if_dunit = unit; 2799 if (unit != IF_DUNIT_NONE) 2800 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2801 else 2802 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2803 } 2804 2805 int 2806 if_printf(struct ifnet *ifp, const char * fmt, ...) 2807 { 2808 va_list ap; 2809 int retval; 2810 2811 retval = printf("%s: ", ifp->if_xname); 2812 va_start(ap, fmt); 2813 retval += vprintf(fmt, ap); 2814 va_end(ap); 2815 return (retval); 2816 } 2817 2818 void 2819 if_start(struct ifnet *ifp) 2820 { 2821 2822 (*(ifp)->if_start)(ifp); 2823 } 2824 2825 /* 2826 * Backwards compatibility interface for drivers 2827 * that have not implemented it 2828 */ 2829 static int 2830 if_transmit(struct ifnet *ifp, struct mbuf *m) 2831 { 2832 int error; 2833 2834 IFQ_HANDOFF(ifp, m, error); 2835 return (error); 2836 } 2837 2838 int 2839 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2840 { 2841 int active = 0; 2842 2843 IF_LOCK(ifq); 2844 if (_IF_QFULL(ifq)) { 2845 _IF_DROP(ifq); 2846 IF_UNLOCK(ifq); 2847 m_freem(m); 2848 return (0); 2849 } 2850 if (ifp != NULL) { 2851 ifp->if_obytes += m->m_pkthdr.len + adjust; 2852 if (m->m_flags & (M_BCAST|M_MCAST)) 2853 ifp->if_omcasts++; 2854 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2855 } 2856 _IF_ENQUEUE(ifq, m); 2857 IF_UNLOCK(ifq); 2858 if (ifp != NULL && !active) 2859 (*(ifp)->if_start)(ifp); 2860 return (1); 2861 } 2862 2863 void 2864 if_register_com_alloc(u_char type, 2865 if_com_alloc_t *a, if_com_free_t *f) 2866 { 2867 2868 KASSERT(if_com_alloc[type] == NULL, 2869 ("if_register_com_alloc: %d already registered", type)); 2870 KASSERT(if_com_free[type] == NULL, 2871 ("if_register_com_alloc: %d free already registered", type)); 2872 2873 if_com_alloc[type] = a; 2874 if_com_free[type] = f; 2875 } 2876 2877 void 2878 if_deregister_com_alloc(u_char type) 2879 { 2880 2881 KASSERT(if_com_alloc[type] != NULL, 2882 ("if_deregister_com_alloc: %d not registered", type)); 2883 KASSERT(if_com_free[type] != NULL, 2884 ("if_deregister_com_alloc: %d free not registered", type)); 2885 if_com_alloc[type] = NULL; 2886 if_com_free[type] = NULL; 2887 } 2888