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_route(struct ifnet *, int flag, int fam); 132 static int if_setflag(struct ifnet *, int, int, int *, int); 133 static void if_slowtimo(void *); 134 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 135 static void if_unroute(struct ifnet *, int flag, int fam); 136 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 137 static int if_rtdel(struct radix_node *, void *); 138 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 139 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 140 static void do_link_state_change(void *, int); 141 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 142 static int if_getgroupmembers(struct ifgroupreq *); 143 static void if_delgroups(struct ifnet *); 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 static int vnet_net_iattach(const void *); 154 155 #ifdef VIMAGE_GLOBALS 156 struct ifnethead ifnet; /* depend on static init XXX */ 157 struct ifgrouphead ifg_head; 158 int if_index; 159 static int if_indexlim; 160 /* Table of ifnet/cdev by index. Locked with ifnet_lock. */ 161 static struct ifindex_entry *ifindex_table; 162 static struct knlist ifklist; 163 #endif 164 165 int ifqmaxlen = IFQ_MAXLEN; 166 struct rwlock ifnet_lock; 167 static if_com_alloc_t *if_com_alloc[256]; 168 static if_com_free_t *if_com_free[256]; 169 170 static void filt_netdetach(struct knote *kn); 171 static int filt_netdev(struct knote *kn, long hint); 172 173 static struct filterops netdev_filtops = 174 { 1, NULL, filt_netdetach, filt_netdev }; 175 176 #ifndef VIMAGE_GLOBALS 177 static struct vnet_symmap vnet_net_symmap[] = { 178 VNET_SYMMAP(net, ifnet), 179 VNET_SYMMAP(net, rt_tables), 180 VNET_SYMMAP(net, rtstat), 181 VNET_SYMMAP(net, rttrash), 182 VNET_SYMMAP_END 183 }; 184 185 static const vnet_modinfo_t vnet_net_modinfo = { 186 .vmi_id = VNET_MOD_NET, 187 .vmi_name = "net", 188 .vmi_symmap = vnet_net_symmap, 189 .vmi_iattach = vnet_net_iattach 190 }; 191 #endif /* !VIMAGE_GLOBALS */ 192 193 /* 194 * System initialization 195 */ 196 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 197 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL); 198 199 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 200 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 201 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 202 203 static struct ifnet * 204 ifnet_byindex_locked(u_short idx) 205 { 206 INIT_VNET_NET(curvnet); 207 struct ifnet *ifp; 208 209 ifp = V_ifindex_table[idx].ife_ifnet; 210 return (ifp); 211 } 212 213 struct ifnet * 214 ifnet_byindex(u_short idx) 215 { 216 struct ifnet *ifp; 217 218 IFNET_RLOCK(); 219 ifp = ifnet_byindex_locked(idx); 220 IFNET_RUNLOCK(); 221 return (ifp); 222 } 223 224 static void 225 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 226 { 227 INIT_VNET_NET(curvnet); 228 229 IFNET_WLOCK_ASSERT(); 230 231 V_ifindex_table[idx].ife_ifnet = ifp; 232 } 233 234 struct ifaddr * 235 ifaddr_byindex(u_short idx) 236 { 237 struct ifaddr *ifa; 238 239 IFNET_RLOCK(); 240 ifa = ifnet_byindex_locked(idx)->if_addr; 241 IFNET_RUNLOCK(); 242 return (ifa); 243 } 244 245 struct cdev * 246 ifdev_byindex(u_short idx) 247 { 248 INIT_VNET_NET(curvnet); 249 struct cdev *cdev; 250 251 IFNET_RLOCK(); 252 cdev = V_ifindex_table[idx].ife_dev; 253 IFNET_RUNLOCK(); 254 return (cdev); 255 } 256 257 static void 258 ifdev_setbyindex(u_short idx, struct cdev *cdev) 259 { 260 INIT_VNET_NET(curvnet); 261 262 IFNET_WLOCK(); 263 V_ifindex_table[idx].ife_dev = cdev; 264 IFNET_WUNLOCK(); 265 } 266 267 static d_open_t netopen; 268 static d_close_t netclose; 269 static d_ioctl_t netioctl; 270 static d_kqfilter_t netkqfilter; 271 272 static struct cdevsw net_cdevsw = { 273 .d_version = D_VERSION, 274 .d_flags = D_NEEDGIANT, 275 .d_open = netopen, 276 .d_close = netclose, 277 .d_ioctl = netioctl, 278 .d_name = "net", 279 .d_kqfilter = netkqfilter, 280 }; 281 282 static int 283 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 284 { 285 return (0); 286 } 287 288 static int 289 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 290 { 291 return (0); 292 } 293 294 static int 295 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 296 { 297 struct ifnet *ifp; 298 int error, idx; 299 300 /* only support interface specific ioctls */ 301 if (IOCGROUP(cmd) != 'i') 302 return (EOPNOTSUPP); 303 idx = dev2unit(dev); 304 if (idx == 0) { 305 /* 306 * special network device, not interface. 307 */ 308 if (cmd == SIOCGIFCONF) 309 return (ifconf(cmd, data)); /* XXX remove cmd */ 310 #ifdef __amd64__ 311 if (cmd == SIOCGIFCONF32) 312 return (ifconf(cmd, data)); /* XXX remove cmd */ 313 #endif 314 return (EOPNOTSUPP); 315 } 316 317 ifp = ifnet_byindex(idx); 318 if (ifp == NULL) 319 return (ENXIO); 320 321 error = ifhwioctl(cmd, ifp, data, td); 322 if (error == ENOIOCTL) 323 error = EOPNOTSUPP; 324 return (error); 325 } 326 327 static int 328 netkqfilter(struct cdev *dev, struct knote *kn) 329 { 330 INIT_VNET_NET(curvnet); 331 struct knlist *klist; 332 struct ifnet *ifp; 333 int idx; 334 335 switch (kn->kn_filter) { 336 case EVFILT_NETDEV: 337 kn->kn_fop = &netdev_filtops; 338 break; 339 default: 340 return (EINVAL); 341 } 342 343 idx = dev2unit(dev); 344 if (idx == 0) { 345 klist = &V_ifklist; 346 } else { 347 ifp = ifnet_byindex(idx); 348 if (ifp == NULL) 349 return (1); 350 klist = &ifp->if_klist; 351 } 352 353 kn->kn_hook = (caddr_t)klist; 354 355 knlist_add(klist, kn, 0); 356 357 return (0); 358 } 359 360 static void 361 filt_netdetach(struct knote *kn) 362 { 363 struct knlist *klist = (struct knlist *)kn->kn_hook; 364 365 knlist_remove(klist, kn, 0); 366 } 367 368 static int 369 filt_netdev(struct knote *kn, long hint) 370 { 371 struct knlist *klist = (struct knlist *)kn->kn_hook; 372 373 /* 374 * Currently NOTE_EXIT is abused to indicate device detach. 375 */ 376 if (hint == NOTE_EXIT) { 377 kn->kn_data = NOTE_LINKINV; 378 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 379 knlist_remove_inevent(klist, kn); 380 return (1); 381 } 382 if (hint != 0) 383 kn->kn_data = hint; /* current status */ 384 if (kn->kn_sfflags & hint) 385 kn->kn_fflags |= hint; 386 return (kn->kn_fflags != 0); 387 } 388 389 /* 390 * Network interface utility routines. 391 * 392 * Routines with ifa_ifwith* names take sockaddr *'s as 393 * parameters. 394 */ 395 396 /* ARGSUSED*/ 397 static void 398 if_init(void *dummy __unused) 399 { 400 401 #ifndef VIMAGE_GLOBALS 402 vnet_mod_register(&vnet_net_modinfo); 403 #else 404 vnet_net_iattach(NULL); 405 #endif 406 407 IFNET_LOCK_INIT(); 408 ifdev_setbyindex(0, make_dev(&net_cdevsw, 0, UID_ROOT, GID_WHEEL, 409 0600, "network")); 410 if_clone_init(); 411 } 412 413 static int 414 vnet_net_iattach(const void *unused __unused) 415 { 416 INIT_VNET_NET(curvnet); 417 418 V_if_index = 0; 419 V_ifindex_table = NULL; 420 V_if_indexlim = 8; 421 422 TAILQ_INIT(&V_ifnet); 423 TAILQ_INIT(&V_ifg_head); 424 knlist_init(&V_ifklist, NULL, NULL, NULL, NULL); 425 if_grow(); /* create initial table */ 426 427 return (0); 428 } 429 430 static void 431 if_grow(void) 432 { 433 INIT_VNET_NET(curvnet); 434 u_int n; 435 struct ifindex_entry *e; 436 437 V_if_indexlim <<= 1; 438 n = V_if_indexlim * sizeof(*e); 439 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 440 if (V_ifindex_table != NULL) { 441 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 442 free((caddr_t)V_ifindex_table, M_IFNET); 443 } 444 V_ifindex_table = e; 445 } 446 447 static void 448 if_check(void *dummy __unused) 449 { 450 451 /* 452 * If at least one interface added during boot uses 453 * if_watchdog then start the timer. 454 */ 455 if (slowtimo_started) 456 if_slowtimo(0); 457 } 458 459 /* 460 * Allocate a struct ifnet and an index for an interface. A layer 2 461 * common structure will also be allocated if an allocation routine is 462 * registered for the passed type. 463 */ 464 struct ifnet* 465 if_alloc(u_char type) 466 { 467 INIT_VNET_NET(curvnet); 468 struct ifnet *ifp; 469 470 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 471 472 /* 473 * Try to find an empty slot below if_index. If we fail, take 474 * the next slot. 475 * 476 * XXX: should be locked! 477 */ 478 for (ifp->if_index = 1; ifp->if_index <= V_if_index; ifp->if_index++) { 479 if (ifnet_byindex(ifp->if_index) == NULL) 480 break; 481 } 482 /* Catch if_index overflow. */ 483 if (ifp->if_index < 1) { 484 free(ifp, M_IFNET); 485 return (NULL); 486 } 487 if (ifp->if_index > V_if_index) 488 V_if_index = ifp->if_index; 489 if (V_if_index >= V_if_indexlim) 490 if_grow(); 491 492 ifp->if_type = type; 493 494 if (if_com_alloc[type] != NULL) { 495 ifp->if_l2com = if_com_alloc[type](type, ifp); 496 if (ifp->if_l2com == NULL) { 497 free(ifp, M_IFNET); 498 return (NULL); 499 } 500 } 501 IFNET_WLOCK(); 502 ifnet_setbyindex(ifp->if_index, ifp); 503 IFNET_WUNLOCK(); 504 IF_ADDR_LOCK_INIT(ifp); 505 506 return (ifp); 507 } 508 509 /* 510 * Free the struct ifnet, the associated index, and the layer 2 common 511 * structure if needed. All the work is done in if_free_type(). 512 * 513 * Do not add code to this function! Add it to if_free_type(). 514 */ 515 void 516 if_free(struct ifnet *ifp) 517 { 518 519 if_free_type(ifp, ifp->if_type); 520 } 521 522 /* 523 * Do the actual work of freeing a struct ifnet, associated index, and 524 * layer 2 common structure. This version should only be called by 525 * intefaces that switch their type after calling if_alloc(). 526 */ 527 void 528 if_free_type(struct ifnet *ifp, u_char type) 529 { 530 INIT_VNET_NET(curvnet); /* ifp->if_vnet can be NULL here ! */ 531 532 if (ifp != ifnet_byindex(ifp->if_index)) { 533 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 534 __func__); 535 return; 536 } 537 538 IFNET_WLOCK(); 539 ifnet_setbyindex(ifp->if_index, NULL); 540 541 /* XXX: should be locked with if_findindex() */ 542 while (V_if_index > 0 && ifnet_byindex_locked(V_if_index) == NULL) 543 V_if_index--; 544 IFNET_WUNLOCK(); 545 546 if (if_com_free[type] != NULL) 547 if_com_free[type](ifp->if_l2com, type); 548 549 IF_ADDR_LOCK_DESTROY(ifp); 550 free(ifp, M_IFNET); 551 } 552 553 void 554 ifq_attach(struct ifaltq *ifq, struct ifnet *ifp) 555 { 556 557 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 558 559 if (ifq->ifq_maxlen == 0) 560 ifq->ifq_maxlen = ifqmaxlen; 561 562 ifq->altq_type = 0; 563 ifq->altq_disc = NULL; 564 ifq->altq_flags &= ALTQF_CANTCHANGE; 565 ifq->altq_tbr = NULL; 566 ifq->altq_ifp = ifp; 567 } 568 569 void 570 ifq_detach(struct ifaltq *ifq) 571 { 572 mtx_destroy(&ifq->ifq_mtx); 573 } 574 575 /* 576 * Perform generic interface initalization tasks and attach the interface 577 * to the list of "active" interfaces. 578 * 579 * XXX: 580 * - The decision to return void and thus require this function to 581 * succeed is questionable. 582 * - We do more initialization here then is probably a good idea. 583 * Some of this should probably move to if_alloc(). 584 * - We should probably do more sanity checking. For instance we don't 585 * do anything to insure if_xname is unique or non-empty. 586 */ 587 void 588 if_attach(struct ifnet *ifp) 589 { 590 INIT_VNET_NET(curvnet); 591 unsigned socksize, ifasize; 592 int namelen, masklen; 593 struct sockaddr_dl *sdl; 594 struct ifaddr *ifa; 595 596 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 597 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 598 ifp->if_xname); 599 600 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 601 IF_AFDATA_LOCK_INIT(ifp); 602 ifp->if_afdata_initialized = 0; 603 604 TAILQ_INIT(&ifp->if_addrhead); 605 TAILQ_INIT(&ifp->if_prefixhead); 606 TAILQ_INIT(&ifp->if_multiaddrs); 607 TAILQ_INIT(&ifp->if_groups); 608 609 if_addgroup(ifp, IFG_ALL); 610 611 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 612 getmicrotime(&ifp->if_lastchange); 613 ifp->if_data.ifi_epoch = time_uptime; 614 ifp->if_data.ifi_datalen = sizeof(struct if_data); 615 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 616 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 617 ("transmit and qflush must both either be set or both be NULL")); 618 619 if (ifp->if_transmit == NULL) { 620 ifp->if_transmit = if_transmit; 621 ifp->if_qflush = if_qflush; 622 } 623 624 #ifdef MAC 625 mac_ifnet_init(ifp); 626 mac_ifnet_create(ifp); 627 #endif 628 629 ifdev_setbyindex(ifp->if_index, make_dev(&net_cdevsw, 630 ifp->if_index, UID_ROOT, GID_WHEEL, 0600, "%s/%s", 631 net_cdevsw.d_name, ifp->if_xname)); 632 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 633 net_cdevsw.d_name, ifp->if_index); 634 635 ifq_attach(&ifp->if_snd, ifp); 636 637 /* 638 * create a Link Level name for this device 639 */ 640 namelen = strlen(ifp->if_xname); 641 /* 642 * Always save enough space for any possiable name so we can do 643 * a rename in place later. 644 */ 645 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 646 socksize = masklen + ifp->if_addrlen; 647 if (socksize < sizeof(*sdl)) 648 socksize = sizeof(*sdl); 649 socksize = roundup2(socksize, sizeof(long)); 650 ifasize = sizeof(*ifa) + 2 * socksize; 651 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 652 IFA_LOCK_INIT(ifa); 653 sdl = (struct sockaddr_dl *)(ifa + 1); 654 sdl->sdl_len = socksize; 655 sdl->sdl_family = AF_LINK; 656 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 657 sdl->sdl_nlen = namelen; 658 sdl->sdl_index = ifp->if_index; 659 sdl->sdl_type = ifp->if_type; 660 ifp->if_addr = ifa; 661 ifa->ifa_ifp = ifp; 662 ifa->ifa_rtrequest = link_rtrequest; 663 ifa->ifa_addr = (struct sockaddr *)sdl; 664 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 665 ifa->ifa_netmask = (struct sockaddr *)sdl; 666 sdl->sdl_len = masklen; 667 while (namelen != 0) 668 sdl->sdl_data[--namelen] = 0xff; 669 ifa->ifa_refcnt = 1; 670 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 671 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 672 673 674 IFNET_WLOCK(); 675 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 676 IFNET_WUNLOCK(); 677 678 if (domain_init_status >= 2) 679 if_attachdomain1(ifp); 680 681 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 682 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 683 684 /* Announce the interface. */ 685 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 686 687 if (ifp->if_watchdog != NULL) { 688 if_printf(ifp, 689 "WARNING: using obsoleted if_watchdog interface\n"); 690 691 /* 692 * Note that we need if_slowtimo(). If this happens after 693 * boot, then call if_slowtimo() directly. 694 */ 695 if (atomic_cmpset_int(&slowtimo_started, 0, 1) && !cold) 696 if_slowtimo(0); 697 } 698 } 699 700 static void 701 if_attachdomain(void *dummy) 702 { 703 INIT_VNET_NET(curvnet); 704 struct ifnet *ifp; 705 int s; 706 707 s = splnet(); 708 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 709 if_attachdomain1(ifp); 710 splx(s); 711 } 712 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 713 if_attachdomain, NULL); 714 715 static void 716 if_attachdomain1(struct ifnet *ifp) 717 { 718 struct domain *dp; 719 int s; 720 721 s = splnet(); 722 723 /* 724 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 725 * cannot lock ifp->if_afdata initialization, entirely. 726 */ 727 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 728 splx(s); 729 return; 730 } 731 if (ifp->if_afdata_initialized >= domain_init_status) { 732 IF_AFDATA_UNLOCK(ifp); 733 splx(s); 734 printf("if_attachdomain called more than once on %s\n", 735 ifp->if_xname); 736 return; 737 } 738 ifp->if_afdata_initialized = domain_init_status; 739 IF_AFDATA_UNLOCK(ifp); 740 741 /* address family dependent data region */ 742 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 743 for (dp = domains; dp; dp = dp->dom_next) { 744 if (dp->dom_ifattach) 745 ifp->if_afdata[dp->dom_family] = 746 (*dp->dom_ifattach)(ifp); 747 } 748 749 splx(s); 750 } 751 752 /* 753 * Remove any unicast or broadcast network addresses from an interface. 754 */ 755 void 756 if_purgeaddrs(struct ifnet *ifp) 757 { 758 struct ifaddr *ifa, *next; 759 760 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 761 if (ifa->ifa_addr->sa_family == AF_LINK) 762 continue; 763 #ifdef INET 764 /* XXX: Ugly!! ad hoc just for INET */ 765 if (ifa->ifa_addr->sa_family == AF_INET) { 766 struct ifaliasreq ifr; 767 768 bzero(&ifr, sizeof(ifr)); 769 ifr.ifra_addr = *ifa->ifa_addr; 770 if (ifa->ifa_dstaddr) 771 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 772 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 773 NULL) == 0) 774 continue; 775 } 776 #endif /* INET */ 777 #ifdef INET6 778 if (ifa->ifa_addr->sa_family == AF_INET6) { 779 in6_purgeaddr(ifa); 780 /* ifp_addrhead is already updated */ 781 continue; 782 } 783 #endif /* INET6 */ 784 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 785 IFAFREE(ifa); 786 } 787 } 788 789 /* 790 * Remove any multicast network addresses from an interface. 791 */ 792 void 793 if_purgemaddrs(struct ifnet *ifp) 794 { 795 struct ifmultiaddr *ifma; 796 struct ifmultiaddr *next; 797 798 IF_ADDR_LOCK(ifp); 799 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 800 if_delmulti_locked(ifp, ifma, 1); 801 IF_ADDR_UNLOCK(ifp); 802 } 803 804 /* 805 * Detach an interface, removing it from the 806 * list of "active" interfaces. 807 * 808 * XXXRW: There are some significant questions about event ordering, and 809 * how to prevent things from starting to use the interface during detach. 810 */ 811 void 812 if_detach(struct ifnet *ifp) 813 { 814 INIT_VNET_NET(ifp->if_vnet); 815 struct ifaddr *ifa; 816 struct radix_node_head *rnh; 817 int s, i, j; 818 struct domain *dp; 819 struct ifnet *iter; 820 int found = 0; 821 822 IFNET_WLOCK(); 823 TAILQ_FOREACH(iter, &V_ifnet, if_link) 824 if (iter == ifp) { 825 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 826 found = 1; 827 break; 828 } 829 IFNET_WUNLOCK(); 830 if (!found) 831 return; 832 833 /* 834 * Remove/wait for pending events. 835 */ 836 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 837 838 /* 839 * Remove routes and flush queues. 840 */ 841 s = splnet(); 842 if_down(ifp); 843 #ifdef ALTQ 844 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 845 altq_disable(&ifp->if_snd); 846 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 847 altq_detach(&ifp->if_snd); 848 #endif 849 850 if_purgeaddrs(ifp); 851 852 #ifdef INET 853 in_ifdetach(ifp); 854 #endif 855 856 #ifdef INET6 857 /* 858 * Remove all IPv6 kernel structs related to ifp. This should be done 859 * before removing routing entries below, since IPv6 interface direct 860 * routes are expected to be removed by the IPv6-specific kernel API. 861 * Otherwise, the kernel will detect some inconsistency and bark it. 862 */ 863 in6_ifdetach(ifp); 864 #endif 865 if_purgemaddrs(ifp); 866 867 /* 868 * Remove link ifaddr pointer and maybe decrement if_index. 869 * Clean up all addresses. 870 */ 871 ifp->if_addr = NULL; 872 destroy_dev(ifdev_byindex(ifp->if_index)); 873 ifdev_setbyindex(ifp->if_index, NULL); 874 875 /* We can now free link ifaddr. */ 876 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 877 ifa = TAILQ_FIRST(&ifp->if_addrhead); 878 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 879 IFAFREE(ifa); 880 } 881 882 /* 883 * Delete all remaining routes using this interface 884 * Unfortuneatly the only way to do this is to slog through 885 * the entire routing table looking for routes which point 886 * to this interface...oh well... 887 */ 888 for (i = 1; i <= AF_MAX; i++) { 889 for (j = 0; j < rt_numfibs; j++) { 890 if ((rnh = V_rt_tables[j][i]) == NULL) 891 continue; 892 RADIX_NODE_HEAD_LOCK(rnh); 893 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 894 RADIX_NODE_HEAD_UNLOCK(rnh); 895 } 896 } 897 898 /* Announce that the interface is gone. */ 899 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 900 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 901 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 902 if_delgroups(ifp); 903 904 IF_AFDATA_LOCK(ifp); 905 for (dp = domains; dp; dp = dp->dom_next) { 906 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 907 (*dp->dom_ifdetach)(ifp, 908 ifp->if_afdata[dp->dom_family]); 909 } 910 IF_AFDATA_UNLOCK(ifp); 911 912 #ifdef MAC 913 mac_ifnet_destroy(ifp); 914 #endif /* MAC */ 915 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 916 knlist_clear(&ifp->if_klist, 0); 917 knlist_destroy(&ifp->if_klist); 918 ifq_detach(&ifp->if_snd); 919 IF_AFDATA_DESTROY(ifp); 920 splx(s); 921 } 922 923 /* 924 * Add a group to an interface 925 */ 926 int 927 if_addgroup(struct ifnet *ifp, const char *groupname) 928 { 929 INIT_VNET_NET(ifp->if_vnet); 930 struct ifg_list *ifgl; 931 struct ifg_group *ifg = NULL; 932 struct ifg_member *ifgm; 933 934 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 935 groupname[strlen(groupname) - 1] <= '9') 936 return (EINVAL); 937 938 IFNET_WLOCK(); 939 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 940 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 941 IFNET_WUNLOCK(); 942 return (EEXIST); 943 } 944 945 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 946 M_NOWAIT)) == NULL) { 947 IFNET_WUNLOCK(); 948 return (ENOMEM); 949 } 950 951 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 952 M_TEMP, M_NOWAIT)) == NULL) { 953 free(ifgl, M_TEMP); 954 IFNET_WUNLOCK(); 955 return (ENOMEM); 956 } 957 958 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 959 if (!strcmp(ifg->ifg_group, groupname)) 960 break; 961 962 if (ifg == NULL) { 963 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 964 M_TEMP, M_NOWAIT)) == NULL) { 965 free(ifgl, M_TEMP); 966 free(ifgm, M_TEMP); 967 IFNET_WUNLOCK(); 968 return (ENOMEM); 969 } 970 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 971 ifg->ifg_refcnt = 0; 972 TAILQ_INIT(&ifg->ifg_members); 973 EVENTHANDLER_INVOKE(group_attach_event, ifg); 974 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 975 } 976 977 ifg->ifg_refcnt++; 978 ifgl->ifgl_group = ifg; 979 ifgm->ifgm_ifp = ifp; 980 981 IF_ADDR_LOCK(ifp); 982 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 983 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 984 IF_ADDR_UNLOCK(ifp); 985 986 IFNET_WUNLOCK(); 987 988 EVENTHANDLER_INVOKE(group_change_event, groupname); 989 990 return (0); 991 } 992 993 /* 994 * Remove a group from an interface 995 */ 996 int 997 if_delgroup(struct ifnet *ifp, const char *groupname) 998 { 999 INIT_VNET_NET(ifp->if_vnet); 1000 struct ifg_list *ifgl; 1001 struct ifg_member *ifgm; 1002 1003 IFNET_WLOCK(); 1004 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1005 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1006 break; 1007 if (ifgl == NULL) { 1008 IFNET_WUNLOCK(); 1009 return (ENOENT); 1010 } 1011 1012 IF_ADDR_LOCK(ifp); 1013 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1014 IF_ADDR_UNLOCK(ifp); 1015 1016 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1017 if (ifgm->ifgm_ifp == ifp) 1018 break; 1019 1020 if (ifgm != NULL) { 1021 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1022 free(ifgm, M_TEMP); 1023 } 1024 1025 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1026 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1027 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1028 free(ifgl->ifgl_group, M_TEMP); 1029 } 1030 IFNET_WUNLOCK(); 1031 1032 free(ifgl, M_TEMP); 1033 1034 EVENTHANDLER_INVOKE(group_change_event, groupname); 1035 1036 return (0); 1037 } 1038 1039 /* 1040 * Remove an interface from all groups 1041 */ 1042 static void 1043 if_delgroups(struct ifnet *ifp) 1044 { 1045 INIT_VNET_NET(ifp->if_vnet); 1046 struct ifg_list *ifgl; 1047 struct ifg_member *ifgm; 1048 char groupname[IFNAMSIZ]; 1049 1050 IFNET_WLOCK(); 1051 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1052 ifgl = TAILQ_FIRST(&ifp->if_groups); 1053 1054 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1055 1056 IF_ADDR_LOCK(ifp); 1057 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1058 IF_ADDR_UNLOCK(ifp); 1059 1060 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1061 if (ifgm->ifgm_ifp == ifp) 1062 break; 1063 1064 if (ifgm != NULL) { 1065 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1066 ifgm_next); 1067 free(ifgm, M_TEMP); 1068 } 1069 1070 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1071 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1072 EVENTHANDLER_INVOKE(group_detach_event, 1073 ifgl->ifgl_group); 1074 free(ifgl->ifgl_group, M_TEMP); 1075 } 1076 IFNET_WUNLOCK(); 1077 1078 free(ifgl, M_TEMP); 1079 1080 EVENTHANDLER_INVOKE(group_change_event, groupname); 1081 1082 IFNET_WLOCK(); 1083 } 1084 IFNET_WUNLOCK(); 1085 } 1086 1087 /* 1088 * Stores all groups from an interface in memory pointed 1089 * to by data 1090 */ 1091 static int 1092 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1093 { 1094 int len, error; 1095 struct ifg_list *ifgl; 1096 struct ifg_req ifgrq, *ifgp; 1097 struct ifgroupreq *ifgr = data; 1098 1099 if (ifgr->ifgr_len == 0) { 1100 IF_ADDR_LOCK(ifp); 1101 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1102 ifgr->ifgr_len += sizeof(struct ifg_req); 1103 IF_ADDR_UNLOCK(ifp); 1104 return (0); 1105 } 1106 1107 len = ifgr->ifgr_len; 1108 ifgp = ifgr->ifgr_groups; 1109 /* XXX: wire */ 1110 IF_ADDR_LOCK(ifp); 1111 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1112 if (len < sizeof(ifgrq)) { 1113 IF_ADDR_UNLOCK(ifp); 1114 return (EINVAL); 1115 } 1116 bzero(&ifgrq, sizeof ifgrq); 1117 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1118 sizeof(ifgrq.ifgrq_group)); 1119 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1120 IF_ADDR_UNLOCK(ifp); 1121 return (error); 1122 } 1123 len -= sizeof(ifgrq); 1124 ifgp++; 1125 } 1126 IF_ADDR_UNLOCK(ifp); 1127 1128 return (0); 1129 } 1130 1131 /* 1132 * Stores all members of a group in memory pointed to by data 1133 */ 1134 static int 1135 if_getgroupmembers(struct ifgroupreq *data) 1136 { 1137 INIT_VNET_NET(curvnet); 1138 struct ifgroupreq *ifgr = data; 1139 struct ifg_group *ifg; 1140 struct ifg_member *ifgm; 1141 struct ifg_req ifgrq, *ifgp; 1142 int len, error; 1143 1144 IFNET_RLOCK(); 1145 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1146 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1147 break; 1148 if (ifg == NULL) { 1149 IFNET_RUNLOCK(); 1150 return (ENOENT); 1151 } 1152 1153 if (ifgr->ifgr_len == 0) { 1154 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1155 ifgr->ifgr_len += sizeof(ifgrq); 1156 IFNET_RUNLOCK(); 1157 return (0); 1158 } 1159 1160 len = ifgr->ifgr_len; 1161 ifgp = ifgr->ifgr_groups; 1162 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1163 if (len < sizeof(ifgrq)) { 1164 IFNET_RUNLOCK(); 1165 return (EINVAL); 1166 } 1167 bzero(&ifgrq, sizeof ifgrq); 1168 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1169 sizeof(ifgrq.ifgrq_member)); 1170 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1171 IFNET_RUNLOCK(); 1172 return (error); 1173 } 1174 len -= sizeof(ifgrq); 1175 ifgp++; 1176 } 1177 IFNET_RUNLOCK(); 1178 1179 return (0); 1180 } 1181 1182 /* 1183 * Delete Routes for a Network Interface 1184 * 1185 * Called for each routing entry via the rnh->rnh_walktree() call above 1186 * to delete all route entries referencing a detaching network interface. 1187 * 1188 * Arguments: 1189 * rn pointer to node in the routing table 1190 * arg argument passed to rnh->rnh_walktree() - detaching interface 1191 * 1192 * Returns: 1193 * 0 successful 1194 * errno failed - reason indicated 1195 * 1196 */ 1197 static int 1198 if_rtdel(struct radix_node *rn, void *arg) 1199 { 1200 struct rtentry *rt = (struct rtentry *)rn; 1201 struct ifnet *ifp = arg; 1202 int err; 1203 1204 if (rt->rt_ifp == ifp) { 1205 1206 /* 1207 * Protect (sorta) against walktree recursion problems 1208 * with cloned routes 1209 */ 1210 if ((rt->rt_flags & RTF_UP) == 0) 1211 return (0); 1212 1213 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1214 rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED, 1215 (struct rtentry **) NULL, rt->rt_fibnum); 1216 if (err) { 1217 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1218 } 1219 } 1220 1221 return (0); 1222 } 1223 1224 /* 1225 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1226 * structs used to represent other address families, it is necessary 1227 * to perform a different comparison. 1228 */ 1229 1230 #define sa_equal(a1, a2) \ 1231 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1232 1233 #define sa_dl_equal(a1, a2) \ 1234 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1235 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1236 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1237 LLADDR((struct sockaddr_dl *)(a2)), \ 1238 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1239 1240 /* 1241 * Locate an interface based on a complete address. 1242 */ 1243 /*ARGSUSED*/ 1244 struct ifaddr * 1245 ifa_ifwithaddr(struct sockaddr *addr) 1246 { 1247 INIT_VNET_NET(curvnet); 1248 struct ifnet *ifp; 1249 struct ifaddr *ifa; 1250 1251 IFNET_RLOCK(); 1252 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 1253 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1254 if (ifa->ifa_addr->sa_family != addr->sa_family) 1255 continue; 1256 if (sa_equal(addr, ifa->ifa_addr)) 1257 goto done; 1258 /* IP6 doesn't have broadcast */ 1259 if ((ifp->if_flags & IFF_BROADCAST) && 1260 ifa->ifa_broadaddr && 1261 ifa->ifa_broadaddr->sa_len != 0 && 1262 sa_equal(ifa->ifa_broadaddr, addr)) 1263 goto done; 1264 } 1265 ifa = NULL; 1266 done: 1267 IFNET_RUNLOCK(); 1268 return (ifa); 1269 } 1270 1271 /* 1272 * Locate an interface based on the broadcast address. 1273 */ 1274 /* ARGSUSED */ 1275 struct ifaddr * 1276 ifa_ifwithbroadaddr(struct sockaddr *addr) 1277 { 1278 INIT_VNET_NET(curvnet); 1279 struct ifnet *ifp; 1280 struct ifaddr *ifa; 1281 1282 IFNET_RLOCK(); 1283 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 1284 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1285 if (ifa->ifa_addr->sa_family != addr->sa_family) 1286 continue; 1287 if ((ifp->if_flags & IFF_BROADCAST) && 1288 ifa->ifa_broadaddr && 1289 ifa->ifa_broadaddr->sa_len != 0 && 1290 sa_equal(ifa->ifa_broadaddr, addr)) 1291 goto done; 1292 } 1293 ifa = NULL; 1294 done: 1295 IFNET_RUNLOCK(); 1296 return (ifa); 1297 } 1298 1299 /* 1300 * Locate the point to point interface with a given destination address. 1301 */ 1302 /*ARGSUSED*/ 1303 struct ifaddr * 1304 ifa_ifwithdstaddr(struct sockaddr *addr) 1305 { 1306 INIT_VNET_NET(curvnet); 1307 struct ifnet *ifp; 1308 struct ifaddr *ifa; 1309 1310 IFNET_RLOCK(); 1311 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1312 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1313 continue; 1314 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1315 if (ifa->ifa_addr->sa_family != addr->sa_family) 1316 continue; 1317 if (ifa->ifa_dstaddr != NULL && 1318 sa_equal(addr, ifa->ifa_dstaddr)) 1319 goto done; 1320 } 1321 } 1322 ifa = NULL; 1323 done: 1324 IFNET_RUNLOCK(); 1325 return (ifa); 1326 } 1327 1328 /* 1329 * Find an interface on a specific network. If many, choice 1330 * is most specific found. 1331 */ 1332 struct ifaddr * 1333 ifa_ifwithnet(struct sockaddr *addr) 1334 { 1335 INIT_VNET_NET(curvnet); 1336 struct ifnet *ifp; 1337 struct ifaddr *ifa; 1338 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 1339 u_int af = addr->sa_family; 1340 char *addr_data = addr->sa_data, *cplim; 1341 1342 /* 1343 * AF_LINK addresses can be looked up directly by their index number, 1344 * so do that if we can. 1345 */ 1346 if (af == AF_LINK) { 1347 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1348 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1349 return (ifaddr_byindex(sdl->sdl_index)); 1350 } 1351 1352 /* 1353 * Scan though each interface, looking for ones that have 1354 * addresses in this address family. 1355 */ 1356 IFNET_RLOCK(); 1357 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1358 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1359 char *cp, *cp2, *cp3; 1360 1361 if (ifa->ifa_addr->sa_family != af) 1362 next: continue; 1363 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 1364 /* 1365 * This is a bit broken as it doesn't 1366 * take into account that the remote end may 1367 * be a single node in the network we are 1368 * looking for. 1369 * The trouble is that we don't know the 1370 * netmask for the remote end. 1371 */ 1372 if (ifa->ifa_dstaddr != NULL && 1373 sa_equal(addr, ifa->ifa_dstaddr)) 1374 goto done; 1375 } else { 1376 /* 1377 * if we have a special address handler, 1378 * then use it instead of the generic one. 1379 */ 1380 if (ifa->ifa_claim_addr) { 1381 if ((*ifa->ifa_claim_addr)(ifa, addr)) 1382 goto done; 1383 continue; 1384 } 1385 1386 /* 1387 * Scan all the bits in the ifa's address. 1388 * If a bit dissagrees with what we are 1389 * looking for, mask it with the netmask 1390 * to see if it really matters. 1391 * (A byte at a time) 1392 */ 1393 if (ifa->ifa_netmask == 0) 1394 continue; 1395 cp = addr_data; 1396 cp2 = ifa->ifa_addr->sa_data; 1397 cp3 = ifa->ifa_netmask->sa_data; 1398 cplim = ifa->ifa_netmask->sa_len 1399 + (char *)ifa->ifa_netmask; 1400 while (cp3 < cplim) 1401 if ((*cp++ ^ *cp2++) & *cp3++) 1402 goto next; /* next address! */ 1403 /* 1404 * If the netmask of what we just found 1405 * is more specific than what we had before 1406 * (if we had one) then remember the new one 1407 * before continuing to search 1408 * for an even better one. 1409 */ 1410 if (ifa_maybe == 0 || 1411 rn_refines((caddr_t)ifa->ifa_netmask, 1412 (caddr_t)ifa_maybe->ifa_netmask)) 1413 ifa_maybe = ifa; 1414 } 1415 } 1416 } 1417 ifa = ifa_maybe; 1418 done: 1419 IFNET_RUNLOCK(); 1420 return (ifa); 1421 } 1422 1423 /* 1424 * Find an interface address specific to an interface best matching 1425 * a given address. 1426 */ 1427 struct ifaddr * 1428 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1429 { 1430 struct ifaddr *ifa; 1431 char *cp, *cp2, *cp3; 1432 char *cplim; 1433 struct ifaddr *ifa_maybe = 0; 1434 u_int af = addr->sa_family; 1435 1436 if (af >= AF_MAX) 1437 return (0); 1438 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1439 if (ifa->ifa_addr->sa_family != af) 1440 continue; 1441 if (ifa_maybe == 0) 1442 ifa_maybe = ifa; 1443 if (ifa->ifa_netmask == 0) { 1444 if (sa_equal(addr, ifa->ifa_addr) || 1445 (ifa->ifa_dstaddr && 1446 sa_equal(addr, ifa->ifa_dstaddr))) 1447 goto done; 1448 continue; 1449 } 1450 if (ifp->if_flags & IFF_POINTOPOINT) { 1451 if (sa_equal(addr, ifa->ifa_dstaddr)) 1452 goto done; 1453 } else { 1454 cp = addr->sa_data; 1455 cp2 = ifa->ifa_addr->sa_data; 1456 cp3 = ifa->ifa_netmask->sa_data; 1457 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1458 for (; cp3 < cplim; cp3++) 1459 if ((*cp++ ^ *cp2++) & *cp3) 1460 break; 1461 if (cp3 == cplim) 1462 goto done; 1463 } 1464 } 1465 ifa = ifa_maybe; 1466 done: 1467 return (ifa); 1468 } 1469 1470 #include <net/route.h> 1471 #include <net/if_llatbl.h> 1472 1473 /* 1474 * Default action when installing a route with a Link Level gateway. 1475 * Lookup an appropriate real ifa to point to. 1476 * This should be moved to /sys/net/link.c eventually. 1477 */ 1478 static void 1479 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1480 { 1481 struct ifaddr *ifa, *oifa; 1482 struct sockaddr *dst; 1483 struct ifnet *ifp; 1484 1485 RT_LOCK_ASSERT(rt); 1486 1487 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1488 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1489 return; 1490 ifa = ifaof_ifpforaddr(dst, ifp); 1491 if (ifa) { 1492 IFAREF(ifa); /* XXX */ 1493 oifa = rt->rt_ifa; 1494 rt->rt_ifa = ifa; 1495 IFAFREE(oifa); 1496 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1497 ifa->ifa_rtrequest(cmd, rt, info); 1498 } 1499 } 1500 1501 /* 1502 * Mark an interface down and notify protocols of 1503 * the transition. 1504 * NOTE: must be called at splnet or eqivalent. 1505 */ 1506 static void 1507 if_unroute(struct ifnet *ifp, int flag, int fam) 1508 { 1509 struct ifaddr *ifa; 1510 1511 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1512 1513 ifp->if_flags &= ~flag; 1514 getmicrotime(&ifp->if_lastchange); 1515 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1516 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1517 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1518 ifp->if_qflush(ifp); 1519 1520 #ifdef DEV_CARP 1521 if (ifp->if_carp) 1522 carp_carpdev_state(ifp->if_carp); 1523 #endif 1524 rt_ifmsg(ifp); 1525 } 1526 1527 /* 1528 * Mark an interface up and notify protocols of 1529 * the transition. 1530 * NOTE: must be called at splnet or eqivalent. 1531 */ 1532 static void 1533 if_route(struct ifnet *ifp, int flag, int fam) 1534 { 1535 struct ifaddr *ifa; 1536 1537 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1538 1539 ifp->if_flags |= flag; 1540 getmicrotime(&ifp->if_lastchange); 1541 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1542 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1543 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1544 #ifdef DEV_CARP 1545 if (ifp->if_carp) 1546 carp_carpdev_state(ifp->if_carp); 1547 #endif 1548 rt_ifmsg(ifp); 1549 #ifdef INET6 1550 in6_if_up(ifp); 1551 #endif 1552 } 1553 1554 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1555 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1556 1557 /* 1558 * Handle a change in the interface link state. To avoid LORs 1559 * between driver lock and upper layer locks, as well as possible 1560 * recursions, we post event to taskqueue, and all job 1561 * is done in static do_link_state_change(). 1562 */ 1563 void 1564 if_link_state_change(struct ifnet *ifp, int link_state) 1565 { 1566 /* Return if state hasn't changed. */ 1567 if (ifp->if_link_state == link_state) 1568 return; 1569 1570 ifp->if_link_state = link_state; 1571 1572 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1573 } 1574 1575 static void 1576 do_link_state_change(void *arg, int pending) 1577 { 1578 struct ifnet *ifp = (struct ifnet *)arg; 1579 int link_state = ifp->if_link_state; 1580 int link; 1581 CURVNET_SET(ifp->if_vnet); 1582 1583 /* Notify that the link state has changed. */ 1584 rt_ifmsg(ifp); 1585 if (link_state == LINK_STATE_UP) 1586 link = NOTE_LINKUP; 1587 else if (link_state == LINK_STATE_DOWN) 1588 link = NOTE_LINKDOWN; 1589 else 1590 link = NOTE_LINKINV; 1591 KNOTE_UNLOCKED(&ifp->if_klist, link); 1592 if (ifp->if_vlantrunk != NULL) 1593 (*vlan_link_state_p)(ifp, link); 1594 1595 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1596 IFP2AC(ifp)->ac_netgraph != NULL) 1597 (*ng_ether_link_state_p)(ifp, link_state); 1598 #ifdef DEV_CARP 1599 if (ifp->if_carp) 1600 carp_carpdev_state(ifp->if_carp); 1601 #endif 1602 if (ifp->if_bridge) { 1603 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1604 (*bstp_linkstate_p)(ifp, link_state); 1605 } 1606 if (ifp->if_lagg) { 1607 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1608 (*lagg_linkstate_p)(ifp, link_state); 1609 } 1610 1611 devctl_notify("IFNET", ifp->if_xname, 1612 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1613 if (pending > 1) 1614 if_printf(ifp, "%d link states coalesced\n", pending); 1615 if (log_link_state_change) 1616 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1617 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1618 CURVNET_RESTORE(); 1619 } 1620 1621 /* 1622 * Mark an interface down and notify protocols of 1623 * the transition. 1624 * NOTE: must be called at splnet or eqivalent. 1625 */ 1626 void 1627 if_down(struct ifnet *ifp) 1628 { 1629 1630 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1631 } 1632 1633 /* 1634 * Mark an interface up and notify protocols of 1635 * the transition. 1636 * NOTE: must be called at splnet or eqivalent. 1637 */ 1638 void 1639 if_up(struct ifnet *ifp) 1640 { 1641 1642 if_route(ifp, IFF_UP, AF_UNSPEC); 1643 } 1644 1645 /* 1646 * Flush an interface queue. 1647 */ 1648 void 1649 if_qflush(struct ifnet *ifp) 1650 { 1651 struct mbuf *m, *n; 1652 struct ifaltq *ifq; 1653 1654 ifq = &ifp->if_snd; 1655 IFQ_LOCK(ifq); 1656 #ifdef ALTQ 1657 if (ALTQ_IS_ENABLED(ifq)) 1658 ALTQ_PURGE(ifq); 1659 #endif 1660 n = ifq->ifq_head; 1661 while ((m = n) != 0) { 1662 n = m->m_act; 1663 m_freem(m); 1664 } 1665 ifq->ifq_head = 0; 1666 ifq->ifq_tail = 0; 1667 ifq->ifq_len = 0; 1668 IFQ_UNLOCK(ifq); 1669 } 1670 1671 /* 1672 * Handle interface watchdog timer routines. Called 1673 * from softclock, we decrement timers (if set) and 1674 * call the appropriate interface routine on expiration. 1675 * 1676 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1677 * holding Giant. 1678 */ 1679 static void 1680 if_slowtimo(void *arg) 1681 { 1682 VNET_ITERATOR_DECL(vnet_iter); 1683 struct ifnet *ifp; 1684 int s = splimp(); 1685 1686 IFNET_RLOCK(); 1687 VNET_LIST_RLOCK(); 1688 VNET_FOREACH(vnet_iter) { 1689 CURVNET_SET(vnet_iter); 1690 INIT_VNET_NET(vnet_iter); 1691 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1692 if (ifp->if_timer == 0 || --ifp->if_timer) 1693 continue; 1694 if (ifp->if_watchdog) 1695 (*ifp->if_watchdog)(ifp); 1696 } 1697 CURVNET_RESTORE(); 1698 } 1699 VNET_LIST_RUNLOCK(); 1700 IFNET_RUNLOCK(); 1701 splx(s); 1702 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1703 } 1704 1705 /* 1706 * Map interface name to 1707 * interface structure pointer. 1708 */ 1709 struct ifnet * 1710 ifunit(const char *name) 1711 { 1712 INIT_VNET_NET(curvnet); 1713 struct ifnet *ifp; 1714 1715 IFNET_RLOCK(); 1716 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1717 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1718 break; 1719 } 1720 IFNET_RUNLOCK(); 1721 return (ifp); 1722 } 1723 1724 /* 1725 * Hardware specific interface ioctls. 1726 */ 1727 static int 1728 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1729 { 1730 struct ifreq *ifr; 1731 struct ifstat *ifs; 1732 int error = 0; 1733 int new_flags, temp_flags; 1734 size_t namelen, onamelen; 1735 char new_name[IFNAMSIZ]; 1736 struct ifaddr *ifa; 1737 struct sockaddr_dl *sdl; 1738 1739 ifr = (struct ifreq *)data; 1740 switch (cmd) { 1741 case SIOCGIFINDEX: 1742 ifr->ifr_index = ifp->if_index; 1743 break; 1744 1745 case SIOCGIFFLAGS: 1746 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1747 ifr->ifr_flags = temp_flags & 0xffff; 1748 ifr->ifr_flagshigh = temp_flags >> 16; 1749 break; 1750 1751 case SIOCGIFCAP: 1752 ifr->ifr_reqcap = ifp->if_capabilities; 1753 ifr->ifr_curcap = ifp->if_capenable; 1754 break; 1755 1756 #ifdef MAC 1757 case SIOCGIFMAC: 1758 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 1759 break; 1760 #endif 1761 1762 case SIOCGIFMETRIC: 1763 ifr->ifr_metric = ifp->if_metric; 1764 break; 1765 1766 case SIOCGIFMTU: 1767 ifr->ifr_mtu = ifp->if_mtu; 1768 break; 1769 1770 case SIOCGIFPHYS: 1771 ifr->ifr_phys = ifp->if_physical; 1772 break; 1773 1774 case SIOCSIFFLAGS: 1775 error = priv_check(td, PRIV_NET_SETIFFLAGS); 1776 if (error) 1777 return (error); 1778 /* 1779 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1780 * check, so we don't need special handling here yet. 1781 */ 1782 new_flags = (ifr->ifr_flags & 0xffff) | 1783 (ifr->ifr_flagshigh << 16); 1784 if (ifp->if_flags & IFF_SMART) { 1785 /* Smart drivers twiddle their own routes */ 1786 } else if (ifp->if_flags & IFF_UP && 1787 (new_flags & IFF_UP) == 0) { 1788 int s = splimp(); 1789 if_down(ifp); 1790 splx(s); 1791 } else if (new_flags & IFF_UP && 1792 (ifp->if_flags & IFF_UP) == 0) { 1793 int s = splimp(); 1794 if_up(ifp); 1795 splx(s); 1796 } 1797 /* See if permanently promiscuous mode bit is about to flip */ 1798 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 1799 if (new_flags & IFF_PPROMISC) 1800 ifp->if_flags |= IFF_PROMISC; 1801 else if (ifp->if_pcount == 0) 1802 ifp->if_flags &= ~IFF_PROMISC; 1803 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 1804 ifp->if_xname, 1805 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 1806 } 1807 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1808 (new_flags &~ IFF_CANTCHANGE); 1809 if (ifp->if_ioctl) { 1810 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1811 } 1812 getmicrotime(&ifp->if_lastchange); 1813 break; 1814 1815 case SIOCSIFCAP: 1816 error = priv_check(td, PRIV_NET_SETIFCAP); 1817 if (error) 1818 return (error); 1819 if (ifp->if_ioctl == NULL) 1820 return (EOPNOTSUPP); 1821 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1822 return (EINVAL); 1823 error = (*ifp->if_ioctl)(ifp, cmd, data); 1824 if (error == 0) 1825 getmicrotime(&ifp->if_lastchange); 1826 break; 1827 1828 #ifdef MAC 1829 case SIOCSIFMAC: 1830 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 1831 break; 1832 #endif 1833 1834 case SIOCSIFNAME: 1835 error = priv_check(td, PRIV_NET_SETIFNAME); 1836 if (error) 1837 return (error); 1838 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1839 if (error != 0) 1840 return (error); 1841 if (new_name[0] == '\0') 1842 return (EINVAL); 1843 if (ifunit(new_name) != NULL) 1844 return (EEXIST); 1845 1846 /* Announce the departure of the interface. */ 1847 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1848 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1849 1850 log(LOG_INFO, "%s: changing name to '%s'\n", 1851 ifp->if_xname, new_name); 1852 1853 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1854 ifa = ifp->if_addr; 1855 IFA_LOCK(ifa); 1856 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1857 namelen = strlen(new_name); 1858 onamelen = sdl->sdl_nlen; 1859 /* 1860 * Move the address if needed. This is safe because we 1861 * allocate space for a name of length IFNAMSIZ when we 1862 * create this in if_attach(). 1863 */ 1864 if (namelen != onamelen) { 1865 bcopy(sdl->sdl_data + onamelen, 1866 sdl->sdl_data + namelen, sdl->sdl_alen); 1867 } 1868 bcopy(new_name, sdl->sdl_data, namelen); 1869 sdl->sdl_nlen = namelen; 1870 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1871 bzero(sdl->sdl_data, onamelen); 1872 while (namelen != 0) 1873 sdl->sdl_data[--namelen] = 0xff; 1874 IFA_UNLOCK(ifa); 1875 1876 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1877 /* Announce the return of the interface. */ 1878 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1879 break; 1880 1881 case SIOCSIFMETRIC: 1882 error = priv_check(td, PRIV_NET_SETIFMETRIC); 1883 if (error) 1884 return (error); 1885 ifp->if_metric = ifr->ifr_metric; 1886 getmicrotime(&ifp->if_lastchange); 1887 break; 1888 1889 case SIOCSIFPHYS: 1890 error = priv_check(td, PRIV_NET_SETIFPHYS); 1891 if (error) 1892 return (error); 1893 if (ifp->if_ioctl == NULL) 1894 return (EOPNOTSUPP); 1895 error = (*ifp->if_ioctl)(ifp, cmd, data); 1896 if (error == 0) 1897 getmicrotime(&ifp->if_lastchange); 1898 break; 1899 1900 case SIOCSIFMTU: 1901 { 1902 u_long oldmtu = ifp->if_mtu; 1903 1904 error = priv_check(td, PRIV_NET_SETIFMTU); 1905 if (error) 1906 return (error); 1907 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1908 return (EINVAL); 1909 if (ifp->if_ioctl == NULL) 1910 return (EOPNOTSUPP); 1911 error = (*ifp->if_ioctl)(ifp, cmd, data); 1912 if (error == 0) { 1913 getmicrotime(&ifp->if_lastchange); 1914 rt_ifmsg(ifp); 1915 } 1916 /* 1917 * If the link MTU changed, do network layer specific procedure. 1918 */ 1919 if (ifp->if_mtu != oldmtu) { 1920 #ifdef INET6 1921 nd6_setmtu(ifp); 1922 #endif 1923 } 1924 break; 1925 } 1926 1927 case SIOCADDMULTI: 1928 case SIOCDELMULTI: 1929 if (cmd == SIOCADDMULTI) 1930 error = priv_check(td, PRIV_NET_ADDMULTI); 1931 else 1932 error = priv_check(td, PRIV_NET_DELMULTI); 1933 if (error) 1934 return (error); 1935 1936 /* Don't allow group membership on non-multicast interfaces. */ 1937 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1938 return (EOPNOTSUPP); 1939 1940 /* Don't let users screw up protocols' entries. */ 1941 if (ifr->ifr_addr.sa_family != AF_LINK) 1942 return (EINVAL); 1943 1944 if (cmd == SIOCADDMULTI) { 1945 struct ifmultiaddr *ifma; 1946 1947 /* 1948 * Userland is only permitted to join groups once 1949 * via the if_addmulti() KPI, because it cannot hold 1950 * struct ifmultiaddr * between calls. It may also 1951 * lose a race while we check if the membership 1952 * already exists. 1953 */ 1954 IF_ADDR_LOCK(ifp); 1955 ifma = if_findmulti(ifp, &ifr->ifr_addr); 1956 IF_ADDR_UNLOCK(ifp); 1957 if (ifma != NULL) 1958 error = EADDRINUSE; 1959 else 1960 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1961 } else { 1962 error = if_delmulti(ifp, &ifr->ifr_addr); 1963 } 1964 if (error == 0) 1965 getmicrotime(&ifp->if_lastchange); 1966 break; 1967 1968 case SIOCSIFPHYADDR: 1969 case SIOCDIFPHYADDR: 1970 #ifdef INET6 1971 case SIOCSIFPHYADDR_IN6: 1972 #endif 1973 case SIOCSLIFPHYADDR: 1974 case SIOCSIFMEDIA: 1975 case SIOCSIFGENERIC: 1976 error = priv_check(td, PRIV_NET_HWIOCTL); 1977 if (error) 1978 return (error); 1979 if (ifp->if_ioctl == NULL) 1980 return (EOPNOTSUPP); 1981 error = (*ifp->if_ioctl)(ifp, cmd, data); 1982 if (error == 0) 1983 getmicrotime(&ifp->if_lastchange); 1984 break; 1985 1986 case SIOCGIFSTATUS: 1987 ifs = (struct ifstat *)data; 1988 ifs->ascii[0] = '\0'; 1989 1990 case SIOCGIFPSRCADDR: 1991 case SIOCGIFPDSTADDR: 1992 case SIOCGLIFPHYADDR: 1993 case SIOCGIFMEDIA: 1994 case SIOCGIFGENERIC: 1995 if (ifp->if_ioctl == NULL) 1996 return (EOPNOTSUPP); 1997 error = (*ifp->if_ioctl)(ifp, cmd, data); 1998 break; 1999 2000 case SIOCSIFLLADDR: 2001 error = priv_check(td, PRIV_NET_SETLLADDR); 2002 if (error) 2003 return (error); 2004 error = if_setlladdr(ifp, 2005 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2006 break; 2007 2008 case SIOCAIFGROUP: 2009 { 2010 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2011 2012 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2013 if (error) 2014 return (error); 2015 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2016 return (error); 2017 break; 2018 } 2019 2020 case SIOCGIFGROUP: 2021 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2022 return (error); 2023 break; 2024 2025 case SIOCDIFGROUP: 2026 { 2027 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2028 2029 error = priv_check(td, PRIV_NET_DELIFGROUP); 2030 if (error) 2031 return (error); 2032 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2033 return (error); 2034 break; 2035 } 2036 2037 default: 2038 error = ENOIOCTL; 2039 break; 2040 } 2041 return (error); 2042 } 2043 2044 /* 2045 * Interface ioctls. 2046 */ 2047 int 2048 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2049 { 2050 struct ifnet *ifp; 2051 struct ifreq *ifr; 2052 int error; 2053 int oif_flags; 2054 2055 switch (cmd) { 2056 case SIOCGIFCONF: 2057 case OSIOCGIFCONF: 2058 #ifdef __amd64__ 2059 case SIOCGIFCONF32: 2060 #endif 2061 return (ifconf(cmd, data)); 2062 } 2063 ifr = (struct ifreq *)data; 2064 2065 switch (cmd) { 2066 case SIOCIFCREATE: 2067 case SIOCIFCREATE2: 2068 error = priv_check(td, PRIV_NET_IFCREATE); 2069 if (error) 2070 return (error); 2071 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 2072 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 2073 case SIOCIFDESTROY: 2074 error = priv_check(td, PRIV_NET_IFDESTROY); 2075 if (error) 2076 return (error); 2077 return if_clone_destroy(ifr->ifr_name); 2078 2079 case SIOCIFGCLONERS: 2080 return (if_clone_list((struct if_clonereq *)data)); 2081 case SIOCGIFGMEMB: 2082 return (if_getgroupmembers((struct ifgroupreq *)data)); 2083 } 2084 2085 ifp = ifunit(ifr->ifr_name); 2086 if (ifp == 0) 2087 return (ENXIO); 2088 2089 error = ifhwioctl(cmd, ifp, data, td); 2090 if (error != ENOIOCTL) 2091 return (error); 2092 2093 oif_flags = ifp->if_flags; 2094 if (so->so_proto == 0) 2095 return (EOPNOTSUPP); 2096 #ifndef COMPAT_43 2097 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2098 data, 2099 ifp, td)); 2100 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2101 error = (*ifp->if_ioctl)(ifp, cmd, data); 2102 #else 2103 { 2104 int ocmd = cmd; 2105 2106 switch (cmd) { 2107 2108 case SIOCSIFDSTADDR: 2109 case SIOCSIFADDR: 2110 case SIOCSIFBRDADDR: 2111 case SIOCSIFNETMASK: 2112 #if BYTE_ORDER != BIG_ENDIAN 2113 if (ifr->ifr_addr.sa_family == 0 && 2114 ifr->ifr_addr.sa_len < 16) { 2115 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2116 ifr->ifr_addr.sa_len = 16; 2117 } 2118 #else 2119 if (ifr->ifr_addr.sa_len == 0) 2120 ifr->ifr_addr.sa_len = 16; 2121 #endif 2122 break; 2123 2124 case OSIOCGIFADDR: 2125 cmd = SIOCGIFADDR; 2126 break; 2127 2128 case OSIOCGIFDSTADDR: 2129 cmd = SIOCGIFDSTADDR; 2130 break; 2131 2132 case OSIOCGIFBRDADDR: 2133 cmd = SIOCGIFBRDADDR; 2134 break; 2135 2136 case OSIOCGIFNETMASK: 2137 cmd = SIOCGIFNETMASK; 2138 } 2139 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2140 cmd, 2141 data, 2142 ifp, td)); 2143 if (error == EOPNOTSUPP && ifp != NULL && 2144 ifp->if_ioctl != NULL) 2145 error = (*ifp->if_ioctl)(ifp, cmd, data); 2146 switch (ocmd) { 2147 2148 case OSIOCGIFADDR: 2149 case OSIOCGIFDSTADDR: 2150 case OSIOCGIFBRDADDR: 2151 case OSIOCGIFNETMASK: 2152 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2153 2154 } 2155 } 2156 #endif /* COMPAT_43 */ 2157 2158 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2159 #ifdef INET6 2160 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 2161 if (ifp->if_flags & IFF_UP) { 2162 int s = splimp(); 2163 in6_if_up(ifp); 2164 splx(s); 2165 } 2166 #endif 2167 } 2168 return (error); 2169 } 2170 2171 /* 2172 * The code common to handling reference counted flags, 2173 * e.g., in ifpromisc() and if_allmulti(). 2174 * The "pflag" argument can specify a permanent mode flag to check, 2175 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2176 * 2177 * Only to be used on stack-owned flags, not driver-owned flags. 2178 */ 2179 static int 2180 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2181 { 2182 struct ifreq ifr; 2183 int error; 2184 int oldflags, oldcount; 2185 2186 /* Sanity checks to catch programming errors */ 2187 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2188 ("%s: setting driver-owned flag %d", __func__, flag)); 2189 2190 if (onswitch) 2191 KASSERT(*refcount >= 0, 2192 ("%s: increment negative refcount %d for flag %d", 2193 __func__, *refcount, flag)); 2194 else 2195 KASSERT(*refcount > 0, 2196 ("%s: decrement non-positive refcount %d for flag %d", 2197 __func__, *refcount, flag)); 2198 2199 /* In case this mode is permanent, just touch refcount */ 2200 if (ifp->if_flags & pflag) { 2201 *refcount += onswitch ? 1 : -1; 2202 return (0); 2203 } 2204 2205 /* Save ifnet parameters for if_ioctl() may fail */ 2206 oldcount = *refcount; 2207 oldflags = ifp->if_flags; 2208 2209 /* 2210 * See if we aren't the only and touching refcount is enough. 2211 * Actually toggle interface flag if we are the first or last. 2212 */ 2213 if (onswitch) { 2214 if ((*refcount)++) 2215 return (0); 2216 ifp->if_flags |= flag; 2217 } else { 2218 if (--(*refcount)) 2219 return (0); 2220 ifp->if_flags &= ~flag; 2221 } 2222 2223 /* Call down the driver since we've changed interface flags */ 2224 if (ifp->if_ioctl == NULL) { 2225 error = EOPNOTSUPP; 2226 goto recover; 2227 } 2228 ifr.ifr_flags = ifp->if_flags & 0xffff; 2229 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2230 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2231 if (error) 2232 goto recover; 2233 /* Notify userland that interface flags have changed */ 2234 rt_ifmsg(ifp); 2235 return (0); 2236 2237 recover: 2238 /* Recover after driver error */ 2239 *refcount = oldcount; 2240 ifp->if_flags = oldflags; 2241 return (error); 2242 } 2243 2244 /* 2245 * Set/clear promiscuous mode on interface ifp based on the truth value 2246 * of pswitch. The calls are reference counted so that only the first 2247 * "on" request actually has an effect, as does the final "off" request. 2248 * Results are undefined if the "off" and "on" requests are not matched. 2249 */ 2250 int 2251 ifpromisc(struct ifnet *ifp, int pswitch) 2252 { 2253 int error; 2254 int oldflags = ifp->if_flags; 2255 2256 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2257 &ifp->if_pcount, pswitch); 2258 /* If promiscuous mode status has changed, log a message */ 2259 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2260 log(LOG_INFO, "%s: promiscuous mode %s\n", 2261 ifp->if_xname, 2262 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2263 return (error); 2264 } 2265 2266 /* 2267 * Return interface configuration 2268 * of system. List may be used 2269 * in later ioctl's (above) to get 2270 * other information. 2271 */ 2272 /*ARGSUSED*/ 2273 static int 2274 ifconf(u_long cmd, caddr_t data) 2275 { 2276 INIT_VNET_NET(curvnet); 2277 struct ifconf *ifc = (struct ifconf *)data; 2278 #ifdef __amd64__ 2279 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 2280 struct ifconf ifc_swab; 2281 #endif 2282 struct ifnet *ifp; 2283 struct ifaddr *ifa; 2284 struct ifreq ifr; 2285 struct sbuf *sb; 2286 int error, full = 0, valid_len, max_len; 2287 2288 #ifdef __amd64__ 2289 if (cmd == SIOCGIFCONF32) { 2290 ifc_swab.ifc_len = ifc32->ifc_len; 2291 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 2292 ifc = &ifc_swab; 2293 } 2294 #endif 2295 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2296 max_len = MAXPHYS - 1; 2297 2298 /* Prevent hostile input from being able to crash the system */ 2299 if (ifc->ifc_len <= 0) 2300 return (EINVAL); 2301 2302 again: 2303 if (ifc->ifc_len <= max_len) { 2304 max_len = ifc->ifc_len; 2305 full = 1; 2306 } 2307 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2308 max_len = 0; 2309 valid_len = 0; 2310 2311 IFNET_RLOCK(); /* could sleep XXX */ 2312 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2313 int addrs; 2314 2315 /* 2316 * Zero the ifr_name buffer to make sure we don't 2317 * disclose the contents of the stack. 2318 */ 2319 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2320 2321 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2322 >= sizeof(ifr.ifr_name)) { 2323 sbuf_delete(sb); 2324 IFNET_RUNLOCK(); 2325 return (ENAMETOOLONG); 2326 } 2327 2328 addrs = 0; 2329 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2330 struct sockaddr *sa = ifa->ifa_addr; 2331 2332 if (prison_if(curthread->td_ucred, sa) != 0) 2333 continue; 2334 addrs++; 2335 #ifdef COMPAT_43 2336 if (cmd == OSIOCGIFCONF) { 2337 struct osockaddr *osa = 2338 (struct osockaddr *)&ifr.ifr_addr; 2339 ifr.ifr_addr = *sa; 2340 osa->sa_family = sa->sa_family; 2341 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2342 max_len += sizeof(ifr); 2343 } else 2344 #endif 2345 if (sa->sa_len <= sizeof(*sa)) { 2346 ifr.ifr_addr = *sa; 2347 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2348 max_len += sizeof(ifr); 2349 } else { 2350 sbuf_bcat(sb, &ifr, 2351 offsetof(struct ifreq, ifr_addr)); 2352 max_len += offsetof(struct ifreq, ifr_addr); 2353 sbuf_bcat(sb, sa, sa->sa_len); 2354 max_len += sa->sa_len; 2355 } 2356 2357 if (!sbuf_overflowed(sb)) 2358 valid_len = sbuf_len(sb); 2359 } 2360 if (addrs == 0) { 2361 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2362 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2363 max_len += sizeof(ifr); 2364 2365 if (!sbuf_overflowed(sb)) 2366 valid_len = sbuf_len(sb); 2367 } 2368 } 2369 IFNET_RUNLOCK(); 2370 2371 /* 2372 * If we didn't allocate enough space (uncommon), try again. If 2373 * we have already allocated as much space as we are allowed, 2374 * return what we've got. 2375 */ 2376 if (valid_len != max_len && !full) { 2377 sbuf_delete(sb); 2378 goto again; 2379 } 2380 2381 ifc->ifc_len = valid_len; 2382 #ifdef __amd64__ 2383 if (cmd == SIOCGIFCONF32) 2384 ifc32->ifc_len = valid_len; 2385 #endif 2386 sbuf_finish(sb); 2387 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2388 sbuf_delete(sb); 2389 return (error); 2390 } 2391 2392 /* 2393 * Just like ifpromisc(), but for all-multicast-reception mode. 2394 */ 2395 int 2396 if_allmulti(struct ifnet *ifp, int onswitch) 2397 { 2398 2399 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2400 } 2401 2402 struct ifmultiaddr * 2403 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2404 { 2405 struct ifmultiaddr *ifma; 2406 2407 IF_ADDR_LOCK_ASSERT(ifp); 2408 2409 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2410 if (sa->sa_family == AF_LINK) { 2411 if (sa_dl_equal(ifma->ifma_addr, sa)) 2412 break; 2413 } else { 2414 if (sa_equal(ifma->ifma_addr, sa)) 2415 break; 2416 } 2417 } 2418 2419 return ifma; 2420 } 2421 2422 /* 2423 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2424 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2425 * the ifnet multicast address list here, so the caller must do that and 2426 * other setup work (such as notifying the device driver). The reference 2427 * count is initialized to 1. 2428 */ 2429 static struct ifmultiaddr * 2430 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2431 int mflags) 2432 { 2433 struct ifmultiaddr *ifma; 2434 struct sockaddr *dupsa; 2435 2436 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2437 M_ZERO); 2438 if (ifma == NULL) 2439 return (NULL); 2440 2441 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2442 if (dupsa == NULL) { 2443 free(ifma, M_IFMADDR); 2444 return (NULL); 2445 } 2446 bcopy(sa, dupsa, sa->sa_len); 2447 ifma->ifma_addr = dupsa; 2448 2449 ifma->ifma_ifp = ifp; 2450 ifma->ifma_refcount = 1; 2451 ifma->ifma_protospec = NULL; 2452 2453 if (llsa == NULL) { 2454 ifma->ifma_lladdr = NULL; 2455 return (ifma); 2456 } 2457 2458 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2459 if (dupsa == NULL) { 2460 free(ifma->ifma_addr, M_IFMADDR); 2461 free(ifma, M_IFMADDR); 2462 return (NULL); 2463 } 2464 bcopy(llsa, dupsa, llsa->sa_len); 2465 ifma->ifma_lladdr = dupsa; 2466 2467 return (ifma); 2468 } 2469 2470 /* 2471 * if_freemulti: free ifmultiaddr structure and possibly attached related 2472 * addresses. The caller is responsible for implementing reference 2473 * counting, notifying the driver, handling routing messages, and releasing 2474 * any dependent link layer state. 2475 */ 2476 static void 2477 if_freemulti(struct ifmultiaddr *ifma) 2478 { 2479 2480 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2481 ifma->ifma_refcount)); 2482 KASSERT(ifma->ifma_protospec == NULL, 2483 ("if_freemulti: protospec not NULL")); 2484 2485 if (ifma->ifma_lladdr != NULL) 2486 free(ifma->ifma_lladdr, M_IFMADDR); 2487 free(ifma->ifma_addr, M_IFMADDR); 2488 free(ifma, M_IFMADDR); 2489 } 2490 2491 /* 2492 * Register an additional multicast address with a network interface. 2493 * 2494 * - If the address is already present, bump the reference count on the 2495 * address and return. 2496 * - If the address is not link-layer, look up a link layer address. 2497 * - Allocate address structures for one or both addresses, and attach to the 2498 * multicast address list on the interface. If automatically adding a link 2499 * layer address, the protocol address will own a reference to the link 2500 * layer address, to be freed when it is freed. 2501 * - Notify the network device driver of an addition to the multicast address 2502 * list. 2503 * 2504 * 'sa' points to caller-owned memory with the desired multicast address. 2505 * 2506 * 'retifma' will be used to return a pointer to the resulting multicast 2507 * address reference, if desired. 2508 */ 2509 int 2510 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2511 struct ifmultiaddr **retifma) 2512 { 2513 struct ifmultiaddr *ifma, *ll_ifma; 2514 struct sockaddr *llsa; 2515 int error; 2516 2517 /* 2518 * If the address is already present, return a new reference to it; 2519 * otherwise, allocate storage and set up a new address. 2520 */ 2521 IF_ADDR_LOCK(ifp); 2522 ifma = if_findmulti(ifp, sa); 2523 if (ifma != NULL) { 2524 ifma->ifma_refcount++; 2525 if (retifma != NULL) 2526 *retifma = ifma; 2527 IF_ADDR_UNLOCK(ifp); 2528 return (0); 2529 } 2530 2531 /* 2532 * The address isn't already present; resolve the protocol address 2533 * into a link layer address, and then look that up, bump its 2534 * refcount or allocate an ifma for that also. If 'llsa' was 2535 * returned, we will need to free it later. 2536 */ 2537 llsa = NULL; 2538 ll_ifma = NULL; 2539 if (ifp->if_resolvemulti != NULL) { 2540 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2541 if (error) 2542 goto unlock_out; 2543 } 2544 2545 /* 2546 * Allocate the new address. Don't hook it up yet, as we may also 2547 * need to allocate a link layer multicast address. 2548 */ 2549 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2550 if (ifma == NULL) { 2551 error = ENOMEM; 2552 goto free_llsa_out; 2553 } 2554 2555 /* 2556 * If a link layer address is found, we'll need to see if it's 2557 * already present in the address list, or allocate is as well. 2558 * When this block finishes, the link layer address will be on the 2559 * list. 2560 */ 2561 if (llsa != NULL) { 2562 ll_ifma = if_findmulti(ifp, llsa); 2563 if (ll_ifma == NULL) { 2564 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2565 if (ll_ifma == NULL) { 2566 --ifma->ifma_refcount; 2567 if_freemulti(ifma); 2568 error = ENOMEM; 2569 goto free_llsa_out; 2570 } 2571 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2572 ifma_link); 2573 } else 2574 ll_ifma->ifma_refcount++; 2575 ifma->ifma_llifma = ll_ifma; 2576 } 2577 2578 /* 2579 * We now have a new multicast address, ifma, and possibly a new or 2580 * referenced link layer address. Add the primary address to the 2581 * ifnet address list. 2582 */ 2583 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2584 2585 if (retifma != NULL) 2586 *retifma = ifma; 2587 2588 /* 2589 * Must generate the message while holding the lock so that 'ifma' 2590 * pointer is still valid. 2591 */ 2592 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2593 IF_ADDR_UNLOCK(ifp); 2594 2595 /* 2596 * We are certain we have added something, so call down to the 2597 * interface to let them know about it. 2598 */ 2599 if (ifp->if_ioctl != NULL) { 2600 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2601 } 2602 2603 if (llsa != NULL) 2604 free(llsa, M_IFMADDR); 2605 2606 return (0); 2607 2608 free_llsa_out: 2609 if (llsa != NULL) 2610 free(llsa, M_IFMADDR); 2611 2612 unlock_out: 2613 IF_ADDR_UNLOCK(ifp); 2614 return (error); 2615 } 2616 2617 /* 2618 * Delete a multicast group membership by network-layer group address. 2619 * 2620 * Returns ENOENT if the entry could not be found. If ifp no longer 2621 * exists, results are undefined. This entry point should only be used 2622 * from subsystems which do appropriate locking to hold ifp for the 2623 * duration of the call. 2624 * Network-layer protocol domains must use if_delmulti_ifma(). 2625 */ 2626 int 2627 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2628 { 2629 struct ifmultiaddr *ifma; 2630 int lastref; 2631 #ifdef INVARIANTS 2632 struct ifnet *oifp; 2633 INIT_VNET_NET(ifp->if_vnet); 2634 2635 IFNET_RLOCK(); 2636 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 2637 if (ifp == oifp) 2638 break; 2639 if (ifp != oifp) 2640 ifp = NULL; 2641 IFNET_RUNLOCK(); 2642 2643 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 2644 #endif 2645 if (ifp == NULL) 2646 return (ENOENT); 2647 2648 IF_ADDR_LOCK(ifp); 2649 lastref = 0; 2650 ifma = if_findmulti(ifp, sa); 2651 if (ifma != NULL) 2652 lastref = if_delmulti_locked(ifp, ifma, 0); 2653 IF_ADDR_UNLOCK(ifp); 2654 2655 if (ifma == NULL) 2656 return (ENOENT); 2657 2658 if (lastref && ifp->if_ioctl != NULL) { 2659 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2660 } 2661 2662 return (0); 2663 } 2664 2665 /* 2666 * Delete a multicast group membership by group membership pointer. 2667 * Network-layer protocol domains must use this routine. 2668 * 2669 * It is safe to call this routine if the ifp disappeared. 2670 */ 2671 void 2672 if_delmulti_ifma(struct ifmultiaddr *ifma) 2673 { 2674 #ifdef DIAGNOSTIC 2675 INIT_VNET_NET(curvnet); 2676 #endif 2677 struct ifnet *ifp; 2678 int lastref; 2679 2680 ifp = ifma->ifma_ifp; 2681 #ifdef DIAGNOSTIC 2682 if (ifp == NULL) { 2683 printf("%s: ifma_ifp seems to be detached\n", __func__); 2684 } else { 2685 struct ifnet *oifp; 2686 2687 IFNET_RLOCK(); 2688 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 2689 if (ifp == oifp) 2690 break; 2691 if (ifp != oifp) { 2692 printf("%s: ifnet %p disappeared\n", __func__, ifp); 2693 ifp = NULL; 2694 } 2695 IFNET_RUNLOCK(); 2696 } 2697 #endif 2698 /* 2699 * If and only if the ifnet instance exists: Acquire the address lock. 2700 */ 2701 if (ifp != NULL) 2702 IF_ADDR_LOCK(ifp); 2703 2704 lastref = if_delmulti_locked(ifp, ifma, 0); 2705 2706 if (ifp != NULL) { 2707 /* 2708 * If and only if the ifnet instance exists: 2709 * Release the address lock. 2710 * If the group was left: update the hardware hash filter. 2711 */ 2712 IF_ADDR_UNLOCK(ifp); 2713 if (lastref && ifp->if_ioctl != NULL) { 2714 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2715 } 2716 } 2717 } 2718 2719 /* 2720 * Perform deletion of network-layer and/or link-layer multicast address. 2721 * 2722 * Return 0 if the reference count was decremented. 2723 * Return 1 if the final reference was released, indicating that the 2724 * hardware hash filter should be reprogrammed. 2725 */ 2726 static int 2727 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 2728 { 2729 struct ifmultiaddr *ll_ifma; 2730 2731 if (ifp != NULL && ifma->ifma_ifp != NULL) { 2732 KASSERT(ifma->ifma_ifp == ifp, 2733 ("%s: inconsistent ifp %p", __func__, ifp)); 2734 IF_ADDR_LOCK_ASSERT(ifp); 2735 } 2736 2737 ifp = ifma->ifma_ifp; 2738 2739 /* 2740 * If the ifnet is detaching, null out references to ifnet, 2741 * so that upper protocol layers will notice, and not attempt 2742 * to obtain locks for an ifnet which no longer exists. The 2743 * routing socket announcement must happen before the ifnet 2744 * instance is detached from the system. 2745 */ 2746 if (detaching) { 2747 #ifdef DIAGNOSTIC 2748 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 2749 #endif 2750 /* 2751 * ifp may already be nulled out if we are being reentered 2752 * to delete the ll_ifma. 2753 */ 2754 if (ifp != NULL) { 2755 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2756 ifma->ifma_ifp = NULL; 2757 } 2758 } 2759 2760 if (--ifma->ifma_refcount > 0) 2761 return 0; 2762 2763 /* 2764 * If this ifma is a network-layer ifma, a link-layer ifma may 2765 * have been associated with it. Release it first if so. 2766 */ 2767 ll_ifma = ifma->ifma_llifma; 2768 if (ll_ifma != NULL) { 2769 KASSERT(ifma->ifma_lladdr != NULL, 2770 ("%s: llifma w/o lladdr", __func__)); 2771 if (detaching) 2772 ll_ifma->ifma_ifp = NULL; /* XXX */ 2773 if (--ll_ifma->ifma_refcount == 0) { 2774 if (ifp != NULL) { 2775 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 2776 ifma_link); 2777 } 2778 if_freemulti(ll_ifma); 2779 } 2780 } 2781 2782 if (ifp != NULL) 2783 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2784 2785 if_freemulti(ifma); 2786 2787 /* 2788 * The last reference to this instance of struct ifmultiaddr 2789 * was released; the hardware should be notified of this change. 2790 */ 2791 return 1; 2792 } 2793 2794 /* 2795 * Set the link layer address on an interface. 2796 * 2797 * At this time we only support certain types of interfaces, 2798 * and we don't allow the length of the address to change. 2799 */ 2800 int 2801 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2802 { 2803 struct sockaddr_dl *sdl; 2804 struct ifaddr *ifa; 2805 struct ifreq ifr; 2806 2807 ifa = ifp->if_addr; 2808 if (ifa == NULL) 2809 return (EINVAL); 2810 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2811 if (sdl == NULL) 2812 return (EINVAL); 2813 if (len != sdl->sdl_alen) /* don't allow length to change */ 2814 return (EINVAL); 2815 switch (ifp->if_type) { 2816 case IFT_ETHER: 2817 case IFT_FDDI: 2818 case IFT_XETHER: 2819 case IFT_ISO88025: 2820 case IFT_L2VLAN: 2821 case IFT_BRIDGE: 2822 case IFT_ARCNET: 2823 case IFT_IEEE8023ADLAG: 2824 case IFT_IEEE80211: 2825 bcopy(lladdr, LLADDR(sdl), len); 2826 break; 2827 default: 2828 return (ENODEV); 2829 } 2830 /* 2831 * If the interface is already up, we need 2832 * to re-init it in order to reprogram its 2833 * address filter. 2834 */ 2835 if ((ifp->if_flags & IFF_UP) != 0) { 2836 if (ifp->if_ioctl) { 2837 ifp->if_flags &= ~IFF_UP; 2838 ifr.ifr_flags = ifp->if_flags & 0xffff; 2839 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2840 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2841 ifp->if_flags |= IFF_UP; 2842 ifr.ifr_flags = ifp->if_flags & 0xffff; 2843 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2844 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2845 } 2846 #ifdef INET 2847 /* 2848 * Also send gratuitous ARPs to notify other nodes about 2849 * the address change. 2850 */ 2851 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2852 if (ifa->ifa_addr->sa_family == AF_INET) 2853 arp_ifinit(ifp, ifa); 2854 } 2855 #endif 2856 } 2857 return (0); 2858 } 2859 2860 /* 2861 * The name argument must be a pointer to storage which will last as 2862 * long as the interface does. For physical devices, the result of 2863 * device_get_name(dev) is a good choice and for pseudo-devices a 2864 * static string works well. 2865 */ 2866 void 2867 if_initname(struct ifnet *ifp, const char *name, int unit) 2868 { 2869 ifp->if_dname = name; 2870 ifp->if_dunit = unit; 2871 if (unit != IF_DUNIT_NONE) 2872 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2873 else 2874 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2875 } 2876 2877 int 2878 if_printf(struct ifnet *ifp, const char * fmt, ...) 2879 { 2880 va_list ap; 2881 int retval; 2882 2883 retval = printf("%s: ", ifp->if_xname); 2884 va_start(ap, fmt); 2885 retval += vprintf(fmt, ap); 2886 va_end(ap); 2887 return (retval); 2888 } 2889 2890 void 2891 if_start(struct ifnet *ifp) 2892 { 2893 2894 (*(ifp)->if_start)(ifp); 2895 } 2896 2897 /* 2898 * Backwards compatibility interface for drivers 2899 * that have not implemented it 2900 */ 2901 static int 2902 if_transmit(struct ifnet *ifp, struct mbuf *m) 2903 { 2904 int error; 2905 2906 IFQ_HANDOFF(ifp, m, error); 2907 return (error); 2908 } 2909 2910 int 2911 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2912 { 2913 int active = 0; 2914 2915 IF_LOCK(ifq); 2916 if (_IF_QFULL(ifq)) { 2917 _IF_DROP(ifq); 2918 IF_UNLOCK(ifq); 2919 m_freem(m); 2920 return (0); 2921 } 2922 if (ifp != NULL) { 2923 ifp->if_obytes += m->m_pkthdr.len + adjust; 2924 if (m->m_flags & (M_BCAST|M_MCAST)) 2925 ifp->if_omcasts++; 2926 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2927 } 2928 _IF_ENQUEUE(ifq, m); 2929 IF_UNLOCK(ifq); 2930 if (ifp != NULL && !active) 2931 (*(ifp)->if_start)(ifp); 2932 return (1); 2933 } 2934 2935 void 2936 if_register_com_alloc(u_char type, 2937 if_com_alloc_t *a, if_com_free_t *f) 2938 { 2939 2940 KASSERT(if_com_alloc[type] == NULL, 2941 ("if_register_com_alloc: %d already registered", type)); 2942 KASSERT(if_com_free[type] == NULL, 2943 ("if_register_com_alloc: %d free already registered", type)); 2944 2945 if_com_alloc[type] = a; 2946 if_com_free[type] = f; 2947 } 2948 2949 void 2950 if_deregister_com_alloc(u_char type) 2951 { 2952 2953 KASSERT(if_com_alloc[type] != NULL, 2954 ("if_deregister_com_alloc: %d not registered", type)); 2955 KASSERT(if_com_free[type] != NULL, 2956 ("if_deregister_com_alloc: %d free not registered", type)); 2957 if_com_alloc[type] = NULL; 2958 if_com_free[type] = NULL; 2959 } 2960