Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if.c
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1 /*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD$ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 #include "opt_mac.h" 37 #include "opt_carp.h" 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <sys/conf.h> 42 #include <sys/malloc.h> 43 #include <sys/sbuf.h> 44 #include <sys/bus.h> 45 #include <sys/mbuf.h> 46 #include <sys/systm.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/sockio.h> 54 #include <sys/syslog.h> 55 #include <sys/sysctl.h> 56 #include <sys/taskqueue.h> 57 #include <sys/domain.h> 58 #include <sys/jail.h> 59 #include <machine/stdarg.h> 60 61 #include <net/if.h> 62 #include <net/if_clone.h> 63 #include <net/if_dl.h> 64 #include <net/if_types.h> 65 #include <net/if_var.h> 66 #include <net/radix.h> 67 #include <net/route.h> 68 69 #if defined(INET) || defined(INET6) 70 /*XXX*/ 71 #include <netinet/in.h> 72 #include <netinet/in_var.h> 73 #ifdef INET6 74 #include <netinet6/in6_var.h> 75 #include <netinet6/in6_ifattach.h> 76 #endif 77 #endif 78 #ifdef INET 79 #include <netinet/if_ether.h> 80 #endif 81 #ifdef DEV_CARP 82 #include <netinet/ip_carp.h> 83 #endif 84 85 #include <security/mac/mac_framework.h> 86 87 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 88 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 89 90 /* Log link state change events */ 91 static int log_link_state_change = 1; 92 93 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 94 &log_link_state_change, 0, 95 "log interface link state change events"); 96 97 void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 98 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 99 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 100 101 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 102 103 /* 104 * XXX: Style; these should be sorted alphabetically, and unprototyped 105 * static functions should be prototyped. Currently they are sorted by 106 * declaration order. 107 */ 108 static void if_attachdomain(void *); 109 static void if_attachdomain1(struct ifnet *); 110 static void if_purgemaddrs(struct ifnet *); 111 static int ifconf(u_long, caddr_t); 112 static void if_freemulti(struct ifmultiaddr *); 113 static void if_grow(void); 114 static void if_init(void *); 115 static void if_check(void *); 116 static void if_qflush(struct ifaltq *); 117 static void if_route(struct ifnet *, int flag, int fam); 118 static int if_setflag(struct ifnet *, int, int, int *, int); 119 static void if_slowtimo(void *); 120 static void if_unroute(struct ifnet *, int flag, int fam); 121 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 122 static int if_rtdel(struct radix_node *, void *); 123 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 124 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 125 static void if_start_deferred(void *context, int pending); 126 static void do_link_state_change(void *, int); 127 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 128 static int if_getgroupmembers(struct ifgroupreq *); 129 #ifdef INET6 130 /* 131 * XXX: declare here to avoid to include many inet6 related files.. 132 * should be more generalized? 133 */ 134 extern void nd6_setmtu(struct ifnet *); 135 #endif 136 137 int if_index = 0; 138 int ifqmaxlen = IFQ_MAXLEN; 139 struct ifnethead ifnet; /* depend on static init XXX */ 140 struct ifgrouphead ifg_head; 141 struct mtx ifnet_lock; 142 static if_com_alloc_t *if_com_alloc[256]; 143 static if_com_free_t *if_com_free[256]; 144 145 static int if_indexlim = 8; 146 static struct knlist ifklist; 147 148 /* 149 * Table of ifnet/cdev by index. Locked with ifnet_lock. 150 */ 151 static struct ifindex_entry *ifindex_table = NULL; 152 153 static void filt_netdetach(struct knote *kn); 154 static int filt_netdev(struct knote *kn, long hint); 155 156 static struct filterops netdev_filtops = 157 { 1, NULL, filt_netdetach, filt_netdev }; 158 159 /* 160 * System initialization 161 */ 162 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 163 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL); 164 165 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 166 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 167 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 168 169 struct ifnet * 170 ifnet_byindex(u_short idx) 171 { 172 struct ifnet *ifp; 173 174 IFNET_RLOCK(); 175 ifp = ifindex_table[idx].ife_ifnet; 176 IFNET_RUNLOCK(); 177 return (ifp); 178 } 179 180 static void 181 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 182 { 183 184 IFNET_WLOCK_ASSERT(); 185 186 ifindex_table[idx].ife_ifnet = ifp; 187 } 188 189 struct ifaddr * 190 ifaddr_byindex(u_short idx) 191 { 192 struct ifaddr *ifa; 193 194 IFNET_RLOCK(); 195 ifa = ifnet_byindex(idx)->if_addr; 196 IFNET_RUNLOCK(); 197 return (ifa); 198 } 199 200 struct cdev * 201 ifdev_byindex(u_short idx) 202 { 203 struct cdev *cdev; 204 205 IFNET_RLOCK(); 206 cdev = ifindex_table[idx].ife_dev; 207 IFNET_RUNLOCK(); 208 return (cdev); 209 } 210 211 static void 212 ifdev_setbyindex(u_short idx, struct cdev *cdev) 213 { 214 215 IFNET_WLOCK(); 216 ifindex_table[idx].ife_dev = cdev; 217 IFNET_WUNLOCK(); 218 } 219 220 static d_open_t netopen; 221 static d_close_t netclose; 222 static d_ioctl_t netioctl; 223 static d_kqfilter_t netkqfilter; 224 225 static struct cdevsw net_cdevsw = { 226 .d_version = D_VERSION, 227 .d_flags = D_NEEDGIANT, 228 .d_open = netopen, 229 .d_close = netclose, 230 .d_ioctl = netioctl, 231 .d_name = "net", 232 .d_kqfilter = netkqfilter, 233 }; 234 235 static int 236 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 237 { 238 return (0); 239 } 240 241 static int 242 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 243 { 244 return (0); 245 } 246 247 static int 248 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 249 { 250 struct ifnet *ifp; 251 int error, idx; 252 253 /* only support interface specific ioctls */ 254 if (IOCGROUP(cmd) != 'i') 255 return (EOPNOTSUPP); 256 idx = minor(dev); 257 if (idx == 0) { 258 /* 259 * special network device, not interface. 260 */ 261 if (cmd == SIOCGIFCONF) 262 return (ifconf(cmd, data)); /* XXX remove cmd */ 263 #ifdef __amd64__ 264 if (cmd == SIOCGIFCONF32) 265 return (ifconf(cmd, data)); /* XXX remove cmd */ 266 #endif 267 return (EOPNOTSUPP); 268 } 269 270 ifp = ifnet_byindex(idx); 271 if (ifp == NULL) 272 return (ENXIO); 273 274 error = ifhwioctl(cmd, ifp, data, td); 275 if (error == ENOIOCTL) 276 error = EOPNOTSUPP; 277 return (error); 278 } 279 280 static int 281 netkqfilter(struct cdev *dev, struct knote *kn) 282 { 283 struct knlist *klist; 284 struct ifnet *ifp; 285 int idx; 286 287 switch (kn->kn_filter) { 288 case EVFILT_NETDEV: 289 kn->kn_fop = &netdev_filtops; 290 break; 291 default: 292 return (EINVAL); 293 } 294 295 idx = minor(dev); 296 if (idx == 0) { 297 klist = &ifklist; 298 } else { 299 ifp = ifnet_byindex(idx); 300 if (ifp == NULL) 301 return (1); 302 klist = &ifp->if_klist; 303 } 304 305 kn->kn_hook = (caddr_t)klist; 306 307 knlist_add(klist, kn, 0); 308 309 return (0); 310 } 311 312 static void 313 filt_netdetach(struct knote *kn) 314 { 315 struct knlist *klist = (struct knlist *)kn->kn_hook; 316 317 knlist_remove(klist, kn, 0); 318 } 319 320 static int 321 filt_netdev(struct knote *kn, long hint) 322 { 323 struct knlist *klist = (struct knlist *)kn->kn_hook; 324 325 /* 326 * Currently NOTE_EXIT is abused to indicate device detach. 327 */ 328 if (hint == NOTE_EXIT) { 329 kn->kn_data = NOTE_LINKINV; 330 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 331 knlist_remove_inevent(klist, kn); 332 return (1); 333 } 334 if (hint != 0) 335 kn->kn_data = hint; /* current status */ 336 if (kn->kn_sfflags & hint) 337 kn->kn_fflags |= hint; 338 return (kn->kn_fflags != 0); 339 } 340 341 /* 342 * Network interface utility routines. 343 * 344 * Routines with ifa_ifwith* names take sockaddr *'s as 345 * parameters. 346 */ 347 348 /* ARGSUSED*/ 349 static void 350 if_init(void *dummy __unused) 351 { 352 353 IFNET_LOCK_INIT(); 354 TAILQ_INIT(&ifnet); 355 TAILQ_INIT(&ifg_head); 356 knlist_init(&ifklist, NULL, NULL, NULL, NULL); 357 if_grow(); /* create initial table */ 358 ifdev_setbyindex(0, make_dev(&net_cdevsw, 0, UID_ROOT, GID_WHEEL, 359 0600, "network")); 360 if_clone_init(); 361 } 362 363 static void 364 if_grow(void) 365 { 366 u_int n; 367 struct ifindex_entry *e; 368 369 if_indexlim <<= 1; 370 n = if_indexlim * sizeof(*e); 371 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 372 if (ifindex_table != NULL) { 373 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 374 free((caddr_t)ifindex_table, M_IFNET); 375 } 376 ifindex_table = e; 377 } 378 379 /* ARGSUSED*/ 380 static void 381 if_check(void *dummy __unused) 382 { 383 struct ifnet *ifp; 384 int s; 385 386 s = splimp(); 387 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 388 TAILQ_FOREACH(ifp, &ifnet, if_link) { 389 if (ifp->if_snd.ifq_maxlen == 0) { 390 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 391 ifp->if_snd.ifq_maxlen = ifqmaxlen; 392 } 393 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 394 if_printf(ifp, 395 "XXX: driver didn't initialize queue mtx\n"); 396 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 397 MTX_NETWORK_LOCK, MTX_DEF); 398 } 399 } 400 IFNET_RUNLOCK(); 401 splx(s); 402 if_slowtimo(0); 403 } 404 405 /* 406 * Allocate a struct ifnet and an index for an interface. A layer 2 407 * common structure will also be allocated if an allocation routine is 408 * registered for the passed type. 409 */ 410 struct ifnet* 411 if_alloc(u_char type) 412 { 413 struct ifnet *ifp; 414 415 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 416 417 /* 418 * Try to find an empty slot below if_index. If we fail, take 419 * the next slot. 420 * 421 * XXX: should be locked! 422 */ 423 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) { 424 if (ifnet_byindex(ifp->if_index) == NULL) 425 break; 426 } 427 /* Catch if_index overflow. */ 428 if (ifp->if_index < 1) { 429 free(ifp, M_IFNET); 430 return (NULL); 431 } 432 if (ifp->if_index > if_index) 433 if_index = ifp->if_index; 434 if (if_index >= if_indexlim) 435 if_grow(); 436 437 ifp->if_type = type; 438 439 if (if_com_alloc[type] != NULL) { 440 ifp->if_l2com = if_com_alloc[type](type, ifp); 441 if (ifp->if_l2com == NULL) { 442 free(ifp, M_IFNET); 443 return (NULL); 444 } 445 } 446 IFNET_WLOCK(); 447 ifnet_setbyindex(ifp->if_index, ifp); 448 IFNET_WUNLOCK(); 449 IF_ADDR_LOCK_INIT(ifp); 450 451 return (ifp); 452 } 453 454 /* 455 * Free the struct ifnet, the associated index, and the layer 2 common 456 * structure if needed. All the work is done in if_free_type(). 457 * 458 * Do not add code to this function! Add it to if_free_type(). 459 */ 460 void 461 if_free(struct ifnet *ifp) 462 { 463 464 if_free_type(ifp, ifp->if_type); 465 } 466 467 /* 468 * Do the actual work of freeing a struct ifnet, associated index, and 469 * layer 2 common structure. This version should only be called by 470 * intefaces that switch their type after calling if_alloc(). 471 */ 472 void 473 if_free_type(struct ifnet *ifp, u_char type) 474 { 475 476 if (ifp != ifnet_byindex(ifp->if_index)) { 477 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 478 __func__); 479 return; 480 } 481 482 IFNET_WLOCK(); 483 ifnet_setbyindex(ifp->if_index, NULL); 484 485 /* XXX: should be locked with if_findindex() */ 486 while (if_index > 0 && ifnet_byindex(if_index) == NULL) 487 if_index--; 488 IFNET_WUNLOCK(); 489 490 if (if_com_free[type] != NULL) 491 if_com_free[type](ifp->if_l2com, type); 492 493 IF_ADDR_LOCK_DESTROY(ifp); 494 free(ifp, M_IFNET); 495 }; 496 497 /* 498 * Perform generic interface initalization tasks and attach the interface 499 * to the list of "active" interfaces. 500 * 501 * XXX: 502 * - The decision to return void and thus require this function to 503 * succeed is questionable. 504 * - We do more initialization here then is probably a good idea. 505 * Some of this should probably move to if_alloc(). 506 * - We should probably do more sanity checking. For instance we don't 507 * do anything to insure if_xname is unique or non-empty. 508 */ 509 void 510 if_attach(struct ifnet *ifp) 511 { 512 unsigned socksize, ifasize; 513 int namelen, masklen; 514 struct sockaddr_dl *sdl; 515 struct ifaddr *ifa; 516 517 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 518 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 519 ifp->if_xname); 520 521 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 522 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 523 IF_AFDATA_LOCK_INIT(ifp); 524 ifp->if_afdata_initialized = 0; 525 526 TAILQ_INIT(&ifp->if_addrhead); 527 TAILQ_INIT(&ifp->if_prefixhead); 528 TAILQ_INIT(&ifp->if_multiaddrs); 529 TAILQ_INIT(&ifp->if_groups); 530 531 if_addgroup(ifp, IFG_ALL); 532 533 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 534 getmicrotime(&ifp->if_lastchange); 535 ifp->if_data.ifi_epoch = time_uptime; 536 ifp->if_data.ifi_datalen = sizeof(struct if_data); 537 538 #ifdef MAC 539 mac_init_ifnet(ifp); 540 mac_create_ifnet(ifp); 541 #endif 542 543 ifdev_setbyindex(ifp->if_index, make_dev(&net_cdevsw, 544 unit2minor(ifp->if_index), UID_ROOT, GID_WHEEL, 0600, "%s/%s", 545 net_cdevsw.d_name, ifp->if_xname)); 546 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 547 net_cdevsw.d_name, ifp->if_index); 548 549 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 550 551 /* 552 * create a Link Level name for this device 553 */ 554 namelen = strlen(ifp->if_xname); 555 /* 556 * Always save enough space for any possiable name so we can do 557 * a rename in place later. 558 */ 559 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 560 socksize = masklen + ifp->if_addrlen; 561 if (socksize < sizeof(*sdl)) 562 socksize = sizeof(*sdl); 563 socksize = roundup2(socksize, sizeof(long)); 564 ifasize = sizeof(*ifa) + 2 * socksize; 565 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 566 IFA_LOCK_INIT(ifa); 567 sdl = (struct sockaddr_dl *)(ifa + 1); 568 sdl->sdl_len = socksize; 569 sdl->sdl_family = AF_LINK; 570 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 571 sdl->sdl_nlen = namelen; 572 sdl->sdl_index = ifp->if_index; 573 sdl->sdl_type = ifp->if_type; 574 ifp->if_addr = ifa; 575 ifa->ifa_ifp = ifp; 576 ifa->ifa_rtrequest = link_rtrequest; 577 ifa->ifa_addr = (struct sockaddr *)sdl; 578 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 579 ifa->ifa_netmask = (struct sockaddr *)sdl; 580 sdl->sdl_len = masklen; 581 while (namelen != 0) 582 sdl->sdl_data[--namelen] = 0xff; 583 ifa->ifa_refcnt = 1; 584 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 585 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 586 ifp->if_snd.altq_type = 0; 587 ifp->if_snd.altq_disc = NULL; 588 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 589 ifp->if_snd.altq_tbr = NULL; 590 ifp->if_snd.altq_ifp = ifp; 591 592 IFNET_WLOCK(); 593 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 594 IFNET_WUNLOCK(); 595 596 if (domain_init_status >= 2) 597 if_attachdomain1(ifp); 598 599 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 600 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 601 602 /* Announce the interface. */ 603 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 604 605 if (ifp->if_watchdog != NULL) 606 if_printf(ifp, 607 "WARNING: using obsoleted if_watchdog interface\n"); 608 if (ifp->if_flags & IFF_NEEDSGIANT) 609 if_printf(ifp, 610 "WARNING: using obsoleted IFF_NEEDSGIANT flag\n"); 611 } 612 613 static void 614 if_attachdomain(void *dummy) 615 { 616 struct ifnet *ifp; 617 int s; 618 619 s = splnet(); 620 TAILQ_FOREACH(ifp, &ifnet, if_link) 621 if_attachdomain1(ifp); 622 splx(s); 623 } 624 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 625 if_attachdomain, NULL); 626 627 static void 628 if_attachdomain1(struct ifnet *ifp) 629 { 630 struct domain *dp; 631 int s; 632 633 s = splnet(); 634 635 /* 636 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 637 * cannot lock ifp->if_afdata initialization, entirely. 638 */ 639 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 640 splx(s); 641 return; 642 } 643 if (ifp->if_afdata_initialized >= domain_init_status) { 644 IF_AFDATA_UNLOCK(ifp); 645 splx(s); 646 printf("if_attachdomain called more than once on %s\n", 647 ifp->if_xname); 648 return; 649 } 650 ifp->if_afdata_initialized = domain_init_status; 651 IF_AFDATA_UNLOCK(ifp); 652 653 /* address family dependent data region */ 654 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 655 for (dp = domains; dp; dp = dp->dom_next) { 656 if (dp->dom_ifattach) 657 ifp->if_afdata[dp->dom_family] = 658 (*dp->dom_ifattach)(ifp); 659 } 660 661 splx(s); 662 } 663 664 /* 665 * Remove any unicast or broadcast network addresses from an interface. 666 */ 667 void 668 if_purgeaddrs(struct ifnet *ifp) 669 { 670 struct ifaddr *ifa, *next; 671 672 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 673 if (ifa->ifa_addr->sa_family == AF_LINK) 674 continue; 675 #ifdef INET 676 /* XXX: Ugly!! ad hoc just for INET */ 677 if (ifa->ifa_addr->sa_family == AF_INET) { 678 struct ifaliasreq ifr; 679 680 bzero(&ifr, sizeof(ifr)); 681 ifr.ifra_addr = *ifa->ifa_addr; 682 if (ifa->ifa_dstaddr) 683 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 684 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 685 NULL) == 0) 686 continue; 687 } 688 #endif /* INET */ 689 #ifdef INET6 690 if (ifa->ifa_addr->sa_family == AF_INET6) { 691 in6_purgeaddr(ifa); 692 /* ifp_addrhead is already updated */ 693 continue; 694 } 695 #endif /* INET6 */ 696 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 697 IFAFREE(ifa); 698 } 699 } 700 701 /* 702 * Remove any multicast network addresses from an interface. 703 */ 704 static void 705 if_purgemaddrs(struct ifnet *ifp) 706 { 707 struct ifmultiaddr *ifma; 708 struct ifmultiaddr *next; 709 710 IF_ADDR_LOCK(ifp); 711 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 712 if_delmulti_locked(ifp, ifma, 1); 713 IF_ADDR_UNLOCK(ifp); 714 } 715 716 /* 717 * Detach an interface, removing it from the 718 * list of "active" interfaces. 719 * 720 * XXXRW: There are some significant questions about event ordering, and 721 * how to prevent things from starting to use the interface during detach. 722 */ 723 void 724 if_detach(struct ifnet *ifp) 725 { 726 struct ifaddr *ifa; 727 struct radix_node_head *rnh; 728 int s; 729 int i; 730 struct domain *dp; 731 struct ifnet *iter; 732 int found = 0; 733 734 IFNET_WLOCK(); 735 TAILQ_FOREACH(iter, &ifnet, if_link) 736 if (iter == ifp) { 737 TAILQ_REMOVE(&ifnet, ifp, if_link); 738 found = 1; 739 break; 740 } 741 IFNET_WUNLOCK(); 742 if (!found) 743 return; 744 745 /* 746 * Remove/wait for pending events. 747 */ 748 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 749 750 /* 751 * Remove routes and flush queues. 752 */ 753 s = splnet(); 754 if_down(ifp); 755 #ifdef ALTQ 756 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 757 altq_disable(&ifp->if_snd); 758 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 759 altq_detach(&ifp->if_snd); 760 #endif 761 762 if_purgeaddrs(ifp); 763 764 #ifdef INET 765 in_ifdetach(ifp); 766 #endif 767 768 #ifdef INET6 769 /* 770 * Remove all IPv6 kernel structs related to ifp. This should be done 771 * before removing routing entries below, since IPv6 interface direct 772 * routes are expected to be removed by the IPv6-specific kernel API. 773 * Otherwise, the kernel will detect some inconsistency and bark it. 774 */ 775 in6_ifdetach(ifp); 776 #endif 777 if_purgemaddrs(ifp); 778 779 /* 780 * Remove link ifaddr pointer and maybe decrement if_index. 781 * Clean up all addresses. 782 */ 783 ifp->if_addr = NULL; 784 destroy_dev(ifdev_byindex(ifp->if_index)); 785 ifdev_setbyindex(ifp->if_index, NULL); 786 787 /* We can now free link ifaddr. */ 788 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 789 ifa = TAILQ_FIRST(&ifp->if_addrhead); 790 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 791 IFAFREE(ifa); 792 } 793 794 /* 795 * Delete all remaining routes using this interface 796 * Unfortuneatly the only way to do this is to slog through 797 * the entire routing table looking for routes which point 798 * to this interface...oh well... 799 */ 800 for (i = 1; i <= AF_MAX; i++) { 801 int j; 802 for (j = 0; j < rt_numfibs; j++) { 803 if ((rnh = rt_tables[j][i]) == NULL) 804 continue; 805 RADIX_NODE_HEAD_LOCK(rnh); 806 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 807 RADIX_NODE_HEAD_UNLOCK(rnh); 808 } 809 } 810 811 /* Announce that the interface is gone. */ 812 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 813 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 814 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 815 816 IF_AFDATA_LOCK(ifp); 817 for (dp = domains; dp; dp = dp->dom_next) { 818 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 819 (*dp->dom_ifdetach)(ifp, 820 ifp->if_afdata[dp->dom_family]); 821 } 822 IF_AFDATA_UNLOCK(ifp); 823 824 #ifdef MAC 825 mac_destroy_ifnet(ifp); 826 #endif /* MAC */ 827 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 828 knlist_clear(&ifp->if_klist, 0); 829 knlist_destroy(&ifp->if_klist); 830 mtx_destroy(&ifp->if_snd.ifq_mtx); 831 IF_AFDATA_DESTROY(ifp); 832 splx(s); 833 } 834 835 /* 836 * Add a group to an interface 837 */ 838 int 839 if_addgroup(struct ifnet *ifp, const char *groupname) 840 { 841 struct ifg_list *ifgl; 842 struct ifg_group *ifg = NULL; 843 struct ifg_member *ifgm; 844 845 if (groupname[0] && groupname[strlen(groupname) - 1] >= '' && 846 groupname[strlen(groupname) - 1] <= '9') 847 return (EINVAL); 848 849 IFNET_WLOCK(); 850 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 851 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 852 IFNET_WUNLOCK(); 853 return (EEXIST); 854 } 855 856 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 857 M_NOWAIT)) == NULL) { 858 IFNET_WUNLOCK(); 859 return (ENOMEM); 860 } 861 862 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 863 M_TEMP, M_NOWAIT)) == NULL) { 864 free(ifgl, M_TEMP); 865 IFNET_WUNLOCK(); 866 return (ENOMEM); 867 } 868 869 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 870 if (!strcmp(ifg->ifg_group, groupname)) 871 break; 872 873 if (ifg == NULL) { 874 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 875 M_TEMP, M_NOWAIT)) == NULL) { 876 free(ifgl, M_TEMP); 877 free(ifgm, M_TEMP); 878 IFNET_WUNLOCK(); 879 return (ENOMEM); 880 } 881 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 882 ifg->ifg_refcnt = 0; 883 TAILQ_INIT(&ifg->ifg_members); 884 EVENTHANDLER_INVOKE(group_attach_event, ifg); 885 TAILQ_INSERT_TAIL(&ifg_head, ifg, ifg_next); 886 } 887 888 ifg->ifg_refcnt++; 889 ifgl->ifgl_group = ifg; 890 ifgm->ifgm_ifp = ifp; 891 892 IF_ADDR_LOCK(ifp); 893 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 894 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 895 IF_ADDR_UNLOCK(ifp); 896 897 IFNET_WUNLOCK(); 898 899 EVENTHANDLER_INVOKE(group_change_event, groupname); 900 901 return (0); 902 } 903 904 /* 905 * Remove a group from an interface 906 */ 907 int 908 if_delgroup(struct ifnet *ifp, const char *groupname) 909 { 910 struct ifg_list *ifgl; 911 struct ifg_member *ifgm; 912 913 IFNET_WLOCK(); 914 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 915 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 916 break; 917 if (ifgl == NULL) { 918 IFNET_WUNLOCK(); 919 return (ENOENT); 920 } 921 922 IF_ADDR_LOCK(ifp); 923 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 924 IF_ADDR_UNLOCK(ifp); 925 926 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 927 if (ifgm->ifgm_ifp == ifp) 928 break; 929 930 if (ifgm != NULL) { 931 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 932 free(ifgm, M_TEMP); 933 } 934 935 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 936 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next); 937 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 938 free(ifgl->ifgl_group, M_TEMP); 939 } 940 IFNET_WUNLOCK(); 941 942 free(ifgl, M_TEMP); 943 944 EVENTHANDLER_INVOKE(group_change_event, groupname); 945 946 return (0); 947 } 948 949 /* 950 * Stores all groups from an interface in memory pointed 951 * to by data 952 */ 953 static int 954 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 955 { 956 int len, error; 957 struct ifg_list *ifgl; 958 struct ifg_req ifgrq, *ifgp; 959 struct ifgroupreq *ifgr = data; 960 961 if (ifgr->ifgr_len == 0) { 962 IF_ADDR_LOCK(ifp); 963 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 964 ifgr->ifgr_len += sizeof(struct ifg_req); 965 IF_ADDR_UNLOCK(ifp); 966 return (0); 967 } 968 969 len = ifgr->ifgr_len; 970 ifgp = ifgr->ifgr_groups; 971 /* XXX: wire */ 972 IF_ADDR_LOCK(ifp); 973 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 974 if (len < sizeof(ifgrq)) { 975 IF_ADDR_UNLOCK(ifp); 976 return (EINVAL); 977 } 978 bzero(&ifgrq, sizeof ifgrq); 979 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 980 sizeof(ifgrq.ifgrq_group)); 981 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 982 IF_ADDR_UNLOCK(ifp); 983 return (error); 984 } 985 len -= sizeof(ifgrq); 986 ifgp++; 987 } 988 IF_ADDR_UNLOCK(ifp); 989 990 return (0); 991 } 992 993 /* 994 * Stores all members of a group in memory pointed to by data 995 */ 996 static int 997 if_getgroupmembers(struct ifgroupreq *data) 998 { 999 struct ifgroupreq *ifgr = data; 1000 struct ifg_group *ifg; 1001 struct ifg_member *ifgm; 1002 struct ifg_req ifgrq, *ifgp; 1003 int len, error; 1004 1005 IFNET_RLOCK(); 1006 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 1007 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1008 break; 1009 if (ifg == NULL) { 1010 IFNET_RUNLOCK(); 1011 return (ENOENT); 1012 } 1013 1014 if (ifgr->ifgr_len == 0) { 1015 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1016 ifgr->ifgr_len += sizeof(ifgrq); 1017 IFNET_RUNLOCK(); 1018 return (0); 1019 } 1020 1021 len = ifgr->ifgr_len; 1022 ifgp = ifgr->ifgr_groups; 1023 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1024 if (len < sizeof(ifgrq)) { 1025 IFNET_RUNLOCK(); 1026 return (EINVAL); 1027 } 1028 bzero(&ifgrq, sizeof ifgrq); 1029 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1030 sizeof(ifgrq.ifgrq_member)); 1031 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1032 IFNET_RUNLOCK(); 1033 return (error); 1034 } 1035 len -= sizeof(ifgrq); 1036 ifgp++; 1037 } 1038 IFNET_RUNLOCK(); 1039 1040 return (0); 1041 } 1042 1043 /* 1044 * Delete Routes for a Network Interface 1045 * 1046 * Called for each routing entry via the rnh->rnh_walktree() call above 1047 * to delete all route entries referencing a detaching network interface. 1048 * 1049 * Arguments: 1050 * rn pointer to node in the routing table 1051 * arg argument passed to rnh->rnh_walktree() - detaching interface 1052 * 1053 * Returns: 1054 * 0 successful 1055 * errno failed - reason indicated 1056 * 1057 */ 1058 static int 1059 if_rtdel(struct radix_node *rn, void *arg) 1060 { 1061 struct rtentry *rt = (struct rtentry *)rn; 1062 struct ifnet *ifp = arg; 1063 int err; 1064 1065 if (rt->rt_ifp == ifp) { 1066 1067 /* 1068 * Protect (sorta) against walktree recursion problems 1069 * with cloned routes 1070 */ 1071 if ((rt->rt_flags & RTF_UP) == 0) 1072 return (0); 1073 1074 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1075 rt_mask(rt), rt->rt_flags, 1076 (struct rtentry **) NULL, rt->rt_fibnum); 1077 if (err) { 1078 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1079 } 1080 } 1081 1082 return (0); 1083 } 1084 1085 /* 1086 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1087 * structs used to represent other address families, it is necessary 1088 * to perform a different comparison. 1089 */ 1090 1091 #define sa_equal(a1, a2) \ 1092 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1093 1094 #define sa_dl_equal(a1, a2) \ 1095 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1096 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1097 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1098 LLADDR((struct sockaddr_dl *)(a2)), \ 1099 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1100 1101 /* 1102 * Locate an interface based on a complete address. 1103 */ 1104 /*ARGSUSED*/ 1105 struct ifaddr * 1106 ifa_ifwithaddr(struct sockaddr *addr) 1107 { 1108 struct ifnet *ifp; 1109 struct ifaddr *ifa; 1110 1111 IFNET_RLOCK(); 1112 TAILQ_FOREACH(ifp, &ifnet, if_link) 1113 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1114 if (ifa->ifa_addr->sa_family != addr->sa_family) 1115 continue; 1116 if (sa_equal(addr, ifa->ifa_addr)) 1117 goto done; 1118 /* IP6 doesn't have broadcast */ 1119 if ((ifp->if_flags & IFF_BROADCAST) && 1120 ifa->ifa_broadaddr && 1121 ifa->ifa_broadaddr->sa_len != 0 && 1122 sa_equal(ifa->ifa_broadaddr, addr)) 1123 goto done; 1124 } 1125 ifa = NULL; 1126 done: 1127 IFNET_RUNLOCK(); 1128 return (ifa); 1129 } 1130 1131 /* 1132 * Locate an interface based on the broadcast address. 1133 */ 1134 /* ARGSUSED */ 1135 struct ifaddr * 1136 ifa_ifwithbroadaddr(struct sockaddr *addr) 1137 { 1138 struct ifnet *ifp; 1139 struct ifaddr *ifa; 1140 1141 IFNET_RLOCK(); 1142 TAILQ_FOREACH(ifp, &ifnet, if_link) 1143 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1144 if (ifa->ifa_addr->sa_family != addr->sa_family) 1145 continue; 1146 if ((ifp->if_flags & IFF_BROADCAST) && 1147 ifa->ifa_broadaddr && 1148 ifa->ifa_broadaddr->sa_len != 0 && 1149 sa_equal(ifa->ifa_broadaddr, addr)) 1150 goto done; 1151 } 1152 ifa = NULL; 1153 done: 1154 IFNET_RUNLOCK(); 1155 return (ifa); 1156 } 1157 1158 /* 1159 * Locate the point to point interface with a given destination address. 1160 */ 1161 /*ARGSUSED*/ 1162 struct ifaddr * 1163 ifa_ifwithdstaddr(struct sockaddr *addr) 1164 { 1165 struct ifnet *ifp; 1166 struct ifaddr *ifa; 1167 1168 IFNET_RLOCK(); 1169 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1170 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1171 continue; 1172 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1173 if (ifa->ifa_addr->sa_family != addr->sa_family) 1174 continue; 1175 if (ifa->ifa_dstaddr != NULL && 1176 sa_equal(addr, ifa->ifa_dstaddr)) 1177 goto done; 1178 } 1179 } 1180 ifa = NULL; 1181 done: 1182 IFNET_RUNLOCK(); 1183 return (ifa); 1184 } 1185 1186 /* 1187 * Find an interface on a specific network. If many, choice 1188 * is most specific found. 1189 */ 1190 struct ifaddr * 1191 ifa_ifwithnet(struct sockaddr *addr) 1192 { 1193 struct ifnet *ifp; 1194 struct ifaddr *ifa; 1195 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 1196 u_int af = addr->sa_family; 1197 char *addr_data = addr->sa_data, *cplim; 1198 1199 /* 1200 * AF_LINK addresses can be looked up directly by their index number, 1201 * so do that if we can. 1202 */ 1203 if (af == AF_LINK) { 1204 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1205 if (sdl->sdl_index && sdl->sdl_index <= if_index) 1206 return (ifaddr_byindex(sdl->sdl_index)); 1207 } 1208 1209 /* 1210 * Scan though each interface, looking for ones that have 1211 * addresses in this address family. 1212 */ 1213 IFNET_RLOCK(); 1214 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1215 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1216 char *cp, *cp2, *cp3; 1217 1218 if (ifa->ifa_addr->sa_family != af) 1219 next: continue; 1220 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 1221 /* 1222 * This is a bit broken as it doesn't 1223 * take into account that the remote end may 1224 * be a single node in the network we are 1225 * looking for. 1226 * The trouble is that we don't know the 1227 * netmask for the remote end. 1228 */ 1229 if (ifa->ifa_dstaddr != NULL && 1230 sa_equal(addr, ifa->ifa_dstaddr)) 1231 goto done; 1232 } else { 1233 /* 1234 * if we have a special address handler, 1235 * then use it instead of the generic one. 1236 */ 1237 if (ifa->ifa_claim_addr) { 1238 if ((*ifa->ifa_claim_addr)(ifa, addr)) 1239 goto done; 1240 continue; 1241 } 1242 1243 /* 1244 * Scan all the bits in the ifa's address. 1245 * If a bit dissagrees with what we are 1246 * looking for, mask it with the netmask 1247 * to see if it really matters. 1248 * (A byte at a time) 1249 */ 1250 if (ifa->ifa_netmask == 0) 1251 continue; 1252 cp = addr_data; 1253 cp2 = ifa->ifa_addr->sa_data; 1254 cp3 = ifa->ifa_netmask->sa_data; 1255 cplim = ifa->ifa_netmask->sa_len 1256 + (char *)ifa->ifa_netmask; 1257 while (cp3 < cplim) 1258 if ((*cp++ ^ *cp2++) & *cp3++) 1259 goto next; /* next address! */ 1260 /* 1261 * If the netmask of what we just found 1262 * is more specific than what we had before 1263 * (if we had one) then remember the new one 1264 * before continuing to search 1265 * for an even better one. 1266 */ 1267 if (ifa_maybe == 0 || 1268 rn_refines((caddr_t)ifa->ifa_netmask, 1269 (caddr_t)ifa_maybe->ifa_netmask)) 1270 ifa_maybe = ifa; 1271 } 1272 } 1273 } 1274 ifa = ifa_maybe; 1275 done: 1276 IFNET_RUNLOCK(); 1277 return (ifa); 1278 } 1279 1280 /* 1281 * Find an interface address specific to an interface best matching 1282 * a given address. 1283 */ 1284 struct ifaddr * 1285 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1286 { 1287 struct ifaddr *ifa; 1288 char *cp, *cp2, *cp3; 1289 char *cplim; 1290 struct ifaddr *ifa_maybe = 0; 1291 u_int af = addr->sa_family; 1292 1293 if (af >= AF_MAX) 1294 return (0); 1295 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1296 if (ifa->ifa_addr->sa_family != af) 1297 continue; 1298 if (ifa_maybe == 0) 1299 ifa_maybe = ifa; 1300 if (ifa->ifa_netmask == 0) { 1301 if (sa_equal(addr, ifa->ifa_addr) || 1302 (ifa->ifa_dstaddr && 1303 sa_equal(addr, ifa->ifa_dstaddr))) 1304 goto done; 1305 continue; 1306 } 1307 if (ifp->if_flags & IFF_POINTOPOINT) { 1308 if (sa_equal(addr, ifa->ifa_dstaddr)) 1309 goto done; 1310 } else { 1311 cp = addr->sa_data; 1312 cp2 = ifa->ifa_addr->sa_data; 1313 cp3 = ifa->ifa_netmask->sa_data; 1314 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1315 for (; cp3 < cplim; cp3++) 1316 if ((*cp++ ^ *cp2++) & *cp3) 1317 break; 1318 if (cp3 == cplim) 1319 goto done; 1320 } 1321 } 1322 ifa = ifa_maybe; 1323 done: 1324 return (ifa); 1325 } 1326 1327 #include <net/route.h> 1328 1329 /* 1330 * Default action when installing a route with a Link Level gateway. 1331 * Lookup an appropriate real ifa to point to. 1332 * This should be moved to /sys/net/link.c eventually. 1333 */ 1334 static void 1335 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1336 { 1337 struct ifaddr *ifa, *oifa; 1338 struct sockaddr *dst; 1339 struct ifnet *ifp; 1340 1341 RT_LOCK_ASSERT(rt); 1342 1343 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1344 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1345 return; 1346 ifa = ifaof_ifpforaddr(dst, ifp); 1347 if (ifa) { 1348 IFAREF(ifa); /* XXX */ 1349 oifa = rt->rt_ifa; 1350 rt->rt_ifa = ifa; 1351 IFAFREE(oifa); 1352 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1353 ifa->ifa_rtrequest(cmd, rt, info); 1354 } 1355 } 1356 1357 /* 1358 * Mark an interface down and notify protocols of 1359 * the transition. 1360 * NOTE: must be called at splnet or eqivalent. 1361 */ 1362 static void 1363 if_unroute(struct ifnet *ifp, int flag, int fam) 1364 { 1365 struct ifaddr *ifa; 1366 1367 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1368 1369 ifp->if_flags &= ~flag; 1370 getmicrotime(&ifp->if_lastchange); 1371 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1372 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1373 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1374 if_qflush(&ifp->if_snd); 1375 #ifdef DEV_CARP 1376 if (ifp->if_carp) 1377 carp_carpdev_state(ifp->if_carp); 1378 #endif 1379 rt_ifmsg(ifp); 1380 } 1381 1382 /* 1383 * Mark an interface up and notify protocols of 1384 * the transition. 1385 * NOTE: must be called at splnet or eqivalent. 1386 */ 1387 static void 1388 if_route(struct ifnet *ifp, int flag, int fam) 1389 { 1390 struct ifaddr *ifa; 1391 1392 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1393 1394 ifp->if_flags |= flag; 1395 getmicrotime(&ifp->if_lastchange); 1396 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1397 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1398 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1399 #ifdef DEV_CARP 1400 if (ifp->if_carp) 1401 carp_carpdev_state(ifp->if_carp); 1402 #endif 1403 rt_ifmsg(ifp); 1404 #ifdef INET6 1405 in6_if_up(ifp); 1406 #endif 1407 } 1408 1409 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1410 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1411 1412 /* 1413 * Handle a change in the interface link state. To avoid LORs 1414 * between driver lock and upper layer locks, as well as possible 1415 * recursions, we post event to taskqueue, and all job 1416 * is done in static do_link_state_change(). 1417 */ 1418 void 1419 if_link_state_change(struct ifnet *ifp, int link_state) 1420 { 1421 /* Return if state hasn't changed. */ 1422 if (ifp->if_link_state == link_state) 1423 return; 1424 1425 ifp->if_link_state = link_state; 1426 1427 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1428 } 1429 1430 static void 1431 do_link_state_change(void *arg, int pending) 1432 { 1433 struct ifnet *ifp = (struct ifnet *)arg; 1434 int link_state = ifp->if_link_state; 1435 int link; 1436 1437 /* Notify that the link state has changed. */ 1438 rt_ifmsg(ifp); 1439 if (link_state == LINK_STATE_UP) 1440 link = NOTE_LINKUP; 1441 else if (link_state == LINK_STATE_DOWN) 1442 link = NOTE_LINKDOWN; 1443 else 1444 link = NOTE_LINKINV; 1445 KNOTE_UNLOCKED(&ifp->if_klist, link); 1446 if (ifp->if_vlantrunk != NULL) 1447 (*vlan_link_state_p)(ifp, link); 1448 1449 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1450 IFP2AC(ifp)->ac_netgraph != NULL) 1451 (*ng_ether_link_state_p)(ifp, link_state); 1452 #ifdef DEV_CARP 1453 if (ifp->if_carp) 1454 carp_carpdev_state(ifp->if_carp); 1455 #endif 1456 if (ifp->if_bridge) { 1457 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1458 (*bstp_linkstate_p)(ifp, link_state); 1459 } 1460 if (ifp->if_lagg) { 1461 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1462 (*lagg_linkstate_p)(ifp, link_state); 1463 } 1464 1465 devctl_notify("IFNET", ifp->if_xname, 1466 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1467 if (pending > 1) 1468 if_printf(ifp, "%d link states coalesced\n", pending); 1469 if (log_link_state_change) 1470 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1471 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1472 } 1473 1474 /* 1475 * Mark an interface down and notify protocols of 1476 * the transition. 1477 * NOTE: must be called at splnet or eqivalent. 1478 */ 1479 void 1480 if_down(struct ifnet *ifp) 1481 { 1482 1483 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1484 } 1485 1486 /* 1487 * Mark an interface up and notify protocols of 1488 * the transition. 1489 * NOTE: must be called at splnet or eqivalent. 1490 */ 1491 void 1492 if_up(struct ifnet *ifp) 1493 { 1494 1495 if_route(ifp, IFF_UP, AF_UNSPEC); 1496 } 1497 1498 /* 1499 * Flush an interface queue. 1500 */ 1501 static void 1502 if_qflush(struct ifaltq *ifq) 1503 { 1504 struct mbuf *m, *n; 1505 1506 IFQ_LOCK(ifq); 1507 #ifdef ALTQ 1508 if (ALTQ_IS_ENABLED(ifq)) 1509 ALTQ_PURGE(ifq); 1510 #endif 1511 n = ifq->ifq_head; 1512 while ((m = n) != 0) { 1513 n = m->m_act; 1514 m_freem(m); 1515 } 1516 ifq->ifq_head = 0; 1517 ifq->ifq_tail = 0; 1518 ifq->ifq_len = 0; 1519 IFQ_UNLOCK(ifq); 1520 } 1521 1522 /* 1523 * Handle interface watchdog timer routines. Called 1524 * from softclock, we decrement timers (if set) and 1525 * call the appropriate interface routine on expiration. 1526 * 1527 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1528 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1529 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1530 */ 1531 static void 1532 if_slowtimo(void *arg) 1533 { 1534 struct ifnet *ifp; 1535 int s = splimp(); 1536 1537 IFNET_RLOCK(); 1538 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1539 if (ifp->if_timer == 0 || --ifp->if_timer) 1540 continue; 1541 if (ifp->if_watchdog) 1542 (*ifp->if_watchdog)(ifp); 1543 } 1544 IFNET_RUNLOCK(); 1545 splx(s); 1546 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1547 } 1548 1549 /* 1550 * Map interface name to 1551 * interface structure pointer. 1552 */ 1553 struct ifnet * 1554 ifunit(const char *name) 1555 { 1556 struct ifnet *ifp; 1557 1558 IFNET_RLOCK(); 1559 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1560 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1561 break; 1562 } 1563 IFNET_RUNLOCK(); 1564 return (ifp); 1565 } 1566 1567 /* 1568 * Hardware specific interface ioctls. 1569 */ 1570 static int 1571 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1572 { 1573 struct ifreq *ifr; 1574 struct ifstat *ifs; 1575 int error = 0; 1576 int new_flags, temp_flags; 1577 size_t namelen, onamelen; 1578 char new_name[IFNAMSIZ]; 1579 struct ifaddr *ifa; 1580 struct sockaddr_dl *sdl; 1581 1582 ifr = (struct ifreq *)data; 1583 switch (cmd) { 1584 case SIOCGIFINDEX: 1585 ifr->ifr_index = ifp->if_index; 1586 break; 1587 1588 case SIOCGIFFLAGS: 1589 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1590 ifr->ifr_flags = temp_flags & 0xffff; 1591 ifr->ifr_flagshigh = temp_flags >> 16; 1592 break; 1593 1594 case SIOCGIFCAP: 1595 ifr->ifr_reqcap = ifp->if_capabilities; 1596 ifr->ifr_curcap = ifp->if_capenable; 1597 break; 1598 1599 #ifdef MAC 1600 case SIOCGIFMAC: 1601 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1602 break; 1603 #endif 1604 1605 case SIOCGIFMETRIC: 1606 ifr->ifr_metric = ifp->if_metric; 1607 break; 1608 1609 case SIOCGIFMTU: 1610 ifr->ifr_mtu = ifp->if_mtu; 1611 break; 1612 1613 case SIOCGIFPHYS: 1614 ifr->ifr_phys = ifp->if_physical; 1615 break; 1616 1617 case SIOCSIFFLAGS: 1618 error = priv_check(td, PRIV_NET_SETIFFLAGS); 1619 if (error) 1620 return (error); 1621 /* 1622 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1623 * check, so we don't need special handling here yet. 1624 */ 1625 new_flags = (ifr->ifr_flags & 0xffff) | 1626 (ifr->ifr_flagshigh << 16); 1627 if (ifp->if_flags & IFF_SMART) { 1628 /* Smart drivers twiddle their own routes */ 1629 } else if (ifp->if_flags & IFF_UP && 1630 (new_flags & IFF_UP) == 0) { 1631 int s = splimp(); 1632 if_down(ifp); 1633 splx(s); 1634 } else if (new_flags & IFF_UP && 1635 (ifp->if_flags & IFF_UP) == 0) { 1636 int s = splimp(); 1637 if_up(ifp); 1638 splx(s); 1639 } 1640 /* See if permanently promiscuous mode bit is about to flip */ 1641 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 1642 if (new_flags & IFF_PPROMISC) 1643 ifp->if_flags |= IFF_PROMISC; 1644 else if (ifp->if_pcount == 0) 1645 ifp->if_flags &= ~IFF_PROMISC; 1646 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 1647 ifp->if_xname, 1648 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 1649 } 1650 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1651 (new_flags &~ IFF_CANTCHANGE); 1652 if (ifp->if_ioctl) { 1653 IFF_LOCKGIANT(ifp); 1654 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1655 IFF_UNLOCKGIANT(ifp); 1656 } 1657 getmicrotime(&ifp->if_lastchange); 1658 break; 1659 1660 case SIOCSIFCAP: 1661 error = priv_check(td, PRIV_NET_SETIFCAP); 1662 if (error) 1663 return (error); 1664 if (ifp->if_ioctl == NULL) 1665 return (EOPNOTSUPP); 1666 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1667 return (EINVAL); 1668 IFF_LOCKGIANT(ifp); 1669 error = (*ifp->if_ioctl)(ifp, cmd, data); 1670 IFF_UNLOCKGIANT(ifp); 1671 if (error == 0) 1672 getmicrotime(&ifp->if_lastchange); 1673 break; 1674 1675 #ifdef MAC 1676 case SIOCSIFMAC: 1677 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1678 break; 1679 #endif 1680 1681 case SIOCSIFNAME: 1682 error = priv_check(td, PRIV_NET_SETIFNAME); 1683 if (error) 1684 return (error); 1685 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1686 if (error != 0) 1687 return (error); 1688 if (new_name[0] == '\0') 1689 return (EINVAL); 1690 if (ifunit(new_name) != NULL) 1691 return (EEXIST); 1692 1693 /* Announce the departure of the interface. */ 1694 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1695 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1696 1697 log(LOG_INFO, "%s: changing name to '%s'\n", 1698 ifp->if_xname, new_name); 1699 1700 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1701 ifa = ifp->if_addr; 1702 IFA_LOCK(ifa); 1703 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1704 namelen = strlen(new_name); 1705 onamelen = sdl->sdl_nlen; 1706 /* 1707 * Move the address if needed. This is safe because we 1708 * allocate space for a name of length IFNAMSIZ when we 1709 * create this in if_attach(). 1710 */ 1711 if (namelen != onamelen) { 1712 bcopy(sdl->sdl_data + onamelen, 1713 sdl->sdl_data + namelen, sdl->sdl_alen); 1714 } 1715 bcopy(new_name, sdl->sdl_data, namelen); 1716 sdl->sdl_nlen = namelen; 1717 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1718 bzero(sdl->sdl_data, onamelen); 1719 while (namelen != 0) 1720 sdl->sdl_data[--namelen] = 0xff; 1721 IFA_UNLOCK(ifa); 1722 1723 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1724 /* Announce the return of the interface. */ 1725 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1726 break; 1727 1728 case SIOCSIFMETRIC: 1729 error = priv_check(td, PRIV_NET_SETIFMETRIC); 1730 if (error) 1731 return (error); 1732 ifp->if_metric = ifr->ifr_metric; 1733 getmicrotime(&ifp->if_lastchange); 1734 break; 1735 1736 case SIOCSIFPHYS: 1737 error = priv_check(td, PRIV_NET_SETIFPHYS); 1738 if (error) 1739 return (error); 1740 if (ifp->if_ioctl == NULL) 1741 return (EOPNOTSUPP); 1742 IFF_LOCKGIANT(ifp); 1743 error = (*ifp->if_ioctl)(ifp, cmd, data); 1744 IFF_UNLOCKGIANT(ifp); 1745 if (error == 0) 1746 getmicrotime(&ifp->if_lastchange); 1747 break; 1748 1749 case SIOCSIFMTU: 1750 { 1751 u_long oldmtu = ifp->if_mtu; 1752 1753 error = priv_check(td, PRIV_NET_SETIFMTU); 1754 if (error) 1755 return (error); 1756 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1757 return (EINVAL); 1758 if (ifp->if_ioctl == NULL) 1759 return (EOPNOTSUPP); 1760 IFF_LOCKGIANT(ifp); 1761 error = (*ifp->if_ioctl)(ifp, cmd, data); 1762 IFF_UNLOCKGIANT(ifp); 1763 if (error == 0) { 1764 getmicrotime(&ifp->if_lastchange); 1765 rt_ifmsg(ifp); 1766 } 1767 /* 1768 * If the link MTU changed, do network layer specific procedure. 1769 */ 1770 if (ifp->if_mtu != oldmtu) { 1771 #ifdef INET6 1772 nd6_setmtu(ifp); 1773 #endif 1774 } 1775 break; 1776 } 1777 1778 case SIOCADDMULTI: 1779 case SIOCDELMULTI: 1780 if (cmd == SIOCADDMULTI) 1781 error = priv_check(td, PRIV_NET_ADDMULTI); 1782 else 1783 error = priv_check(td, PRIV_NET_DELMULTI); 1784 if (error) 1785 return (error); 1786 1787 /* Don't allow group membership on non-multicast interfaces. */ 1788 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1789 return (EOPNOTSUPP); 1790 1791 /* Don't let users screw up protocols' entries. */ 1792 if (ifr->ifr_addr.sa_family != AF_LINK) 1793 return (EINVAL); 1794 1795 if (cmd == SIOCADDMULTI) { 1796 struct ifmultiaddr *ifma; 1797 1798 /* 1799 * Userland is only permitted to join groups once 1800 * via the if_addmulti() KPI, because it cannot hold 1801 * struct ifmultiaddr * between calls. It may also 1802 * lose a race while we check if the membership 1803 * already exists. 1804 */ 1805 IF_ADDR_LOCK(ifp); 1806 ifma = if_findmulti(ifp, &ifr->ifr_addr); 1807 IF_ADDR_UNLOCK(ifp); 1808 if (ifma != NULL) 1809 error = EADDRINUSE; 1810 else 1811 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1812 } else { 1813 error = if_delmulti(ifp, &ifr->ifr_addr); 1814 } 1815 if (error == 0) 1816 getmicrotime(&ifp->if_lastchange); 1817 break; 1818 1819 case SIOCSIFPHYADDR: 1820 case SIOCDIFPHYADDR: 1821 #ifdef INET6 1822 case SIOCSIFPHYADDR_IN6: 1823 #endif 1824 case SIOCSLIFPHYADDR: 1825 case SIOCSIFMEDIA: 1826 case SIOCSIFGENERIC: 1827 error = priv_check(td, PRIV_NET_HWIOCTL); 1828 if (error) 1829 return (error); 1830 if (ifp->if_ioctl == NULL) 1831 return (EOPNOTSUPP); 1832 IFF_LOCKGIANT(ifp); 1833 error = (*ifp->if_ioctl)(ifp, cmd, data); 1834 IFF_UNLOCKGIANT(ifp); 1835 if (error == 0) 1836 getmicrotime(&ifp->if_lastchange); 1837 break; 1838 1839 case SIOCGIFSTATUS: 1840 ifs = (struct ifstat *)data; 1841 ifs->ascii[0] = '\0'; 1842 1843 case SIOCGIFPSRCADDR: 1844 case SIOCGIFPDSTADDR: 1845 case SIOCGLIFPHYADDR: 1846 case SIOCGIFMEDIA: 1847 case SIOCGIFGENERIC: 1848 if (ifp->if_ioctl == NULL) 1849 return (EOPNOTSUPP); 1850 IFF_LOCKGIANT(ifp); 1851 error = (*ifp->if_ioctl)(ifp, cmd, data); 1852 IFF_UNLOCKGIANT(ifp); 1853 break; 1854 1855 case SIOCSIFLLADDR: 1856 error = priv_check(td, PRIV_NET_SETLLADDR); 1857 if (error) 1858 return (error); 1859 error = if_setlladdr(ifp, 1860 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1861 break; 1862 1863 case SIOCAIFGROUP: 1864 { 1865 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1866 1867 error = priv_check(td, PRIV_NET_ADDIFGROUP); 1868 if (error) 1869 return (error); 1870 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 1871 return (error); 1872 break; 1873 } 1874 1875 case SIOCGIFGROUP: 1876 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 1877 return (error); 1878 break; 1879 1880 case SIOCDIFGROUP: 1881 { 1882 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1883 1884 error = priv_check(td, PRIV_NET_DELIFGROUP); 1885 if (error) 1886 return (error); 1887 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 1888 return (error); 1889 break; 1890 } 1891 1892 default: 1893 error = ENOIOCTL; 1894 break; 1895 } 1896 return (error); 1897 } 1898 1899 /* 1900 * Interface ioctls. 1901 */ 1902 int 1903 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1904 { 1905 struct ifnet *ifp; 1906 struct ifreq *ifr; 1907 int error; 1908 int oif_flags; 1909 1910 switch (cmd) { 1911 case SIOCGIFCONF: 1912 case OSIOCGIFCONF: 1913 #ifdef __amd64__ 1914 case SIOCGIFCONF32: 1915 #endif 1916 return (ifconf(cmd, data)); 1917 } 1918 ifr = (struct ifreq *)data; 1919 1920 switch (cmd) { 1921 case SIOCIFCREATE: 1922 case SIOCIFCREATE2: 1923 error = priv_check(td, PRIV_NET_IFCREATE); 1924 if (error) 1925 return (error); 1926 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 1927 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 1928 case SIOCIFDESTROY: 1929 error = priv_check(td, PRIV_NET_IFDESTROY); 1930 if (error) 1931 return (error); 1932 return if_clone_destroy(ifr->ifr_name); 1933 1934 case SIOCIFGCLONERS: 1935 return (if_clone_list((struct if_clonereq *)data)); 1936 case SIOCGIFGMEMB: 1937 return (if_getgroupmembers((struct ifgroupreq *)data)); 1938 } 1939 1940 ifp = ifunit(ifr->ifr_name); 1941 if (ifp == 0) 1942 return (ENXIO); 1943 1944 error = ifhwioctl(cmd, ifp, data, td); 1945 if (error != ENOIOCTL) 1946 return (error); 1947 1948 oif_flags = ifp->if_flags; 1949 if (so->so_proto == 0) 1950 return (EOPNOTSUPP); 1951 #ifndef COMPAT_43 1952 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1953 data, 1954 ifp, td)); 1955 #else 1956 { 1957 int ocmd = cmd; 1958 1959 switch (cmd) { 1960 1961 case SIOCSIFDSTADDR: 1962 case SIOCSIFADDR: 1963 case SIOCSIFBRDADDR: 1964 case SIOCSIFNETMASK: 1965 #if BYTE_ORDER != BIG_ENDIAN 1966 if (ifr->ifr_addr.sa_family == 0 && 1967 ifr->ifr_addr.sa_len < 16) { 1968 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1969 ifr->ifr_addr.sa_len = 16; 1970 } 1971 #else 1972 if (ifr->ifr_addr.sa_len == 0) 1973 ifr->ifr_addr.sa_len = 16; 1974 #endif 1975 break; 1976 1977 case OSIOCGIFADDR: 1978 cmd = SIOCGIFADDR; 1979 break; 1980 1981 case OSIOCGIFDSTADDR: 1982 cmd = SIOCGIFDSTADDR; 1983 break; 1984 1985 case OSIOCGIFBRDADDR: 1986 cmd = SIOCGIFBRDADDR; 1987 break; 1988 1989 case OSIOCGIFNETMASK: 1990 cmd = SIOCGIFNETMASK; 1991 } 1992 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1993 cmd, 1994 data, 1995 ifp, td)); 1996 switch (ocmd) { 1997 1998 case OSIOCGIFADDR: 1999 case OSIOCGIFDSTADDR: 2000 case OSIOCGIFBRDADDR: 2001 case OSIOCGIFNETMASK: 2002 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2003 2004 } 2005 } 2006 #endif /* COMPAT_43 */ 2007 2008 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2009 #ifdef INET6 2010 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 2011 if (ifp->if_flags & IFF_UP) { 2012 int s = splimp(); 2013 in6_if_up(ifp); 2014 splx(s); 2015 } 2016 #endif 2017 } 2018 return (error); 2019 } 2020 2021 /* 2022 * The code common to handling reference counted flags, 2023 * e.g., in ifpromisc() and if_allmulti(). 2024 * The "pflag" argument can specify a permanent mode flag to check, 2025 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2026 * 2027 * Only to be used on stack-owned flags, not driver-owned flags. 2028 */ 2029 static int 2030 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2031 { 2032 struct ifreq ifr; 2033 int error; 2034 int oldflags, oldcount; 2035 2036 /* Sanity checks to catch programming errors */ 2037 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2038 ("%s: setting driver-owned flag %d", __func__, flag)); 2039 2040 if (onswitch) 2041 KASSERT(*refcount >= 0, 2042 ("%s: increment negative refcount %d for flag %d", 2043 __func__, *refcount, flag)); 2044 else 2045 KASSERT(*refcount > 0, 2046 ("%s: decrement non-positive refcount %d for flag %d", 2047 __func__, *refcount, flag)); 2048 2049 /* In case this mode is permanent, just touch refcount */ 2050 if (ifp->if_flags & pflag) { 2051 *refcount += onswitch ? 1 : -1; 2052 return (0); 2053 } 2054 2055 /* Save ifnet parameters for if_ioctl() may fail */ 2056 oldcount = *refcount; 2057 oldflags = ifp->if_flags; 2058 2059 /* 2060 * See if we aren't the only and touching refcount is enough. 2061 * Actually toggle interface flag if we are the first or last. 2062 */ 2063 if (onswitch) { 2064 if ((*refcount)++) 2065 return (0); 2066 ifp->if_flags |= flag; 2067 } else { 2068 if (--(*refcount)) 2069 return (0); 2070 ifp->if_flags &= ~flag; 2071 } 2072 2073 /* Call down the driver since we've changed interface flags */ 2074 if (ifp->if_ioctl == NULL) { 2075 error = EOPNOTSUPP; 2076 goto recover; 2077 } 2078 ifr.ifr_flags = ifp->if_flags & 0xffff; 2079 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2080 IFF_LOCKGIANT(ifp); 2081 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2082 IFF_UNLOCKGIANT(ifp); 2083 if (error) 2084 goto recover; 2085 /* Notify userland that interface flags have changed */ 2086 rt_ifmsg(ifp); 2087 return (0); 2088 2089 recover: 2090 /* Recover after driver error */ 2091 *refcount = oldcount; 2092 ifp->if_flags = oldflags; 2093 return (error); 2094 } 2095 2096 /* 2097 * Set/clear promiscuous mode on interface ifp based on the truth value 2098 * of pswitch. The calls are reference counted so that only the first 2099 * "on" request actually has an effect, as does the final "off" request. 2100 * Results are undefined if the "off" and "on" requests are not matched. 2101 */ 2102 int 2103 ifpromisc(struct ifnet *ifp, int pswitch) 2104 { 2105 int error; 2106 int oldflags = ifp->if_flags; 2107 2108 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2109 &ifp->if_pcount, pswitch); 2110 /* If promiscuous mode status has changed, log a message */ 2111 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2112 log(LOG_INFO, "%s: promiscuous mode %s\n", 2113 ifp->if_xname, 2114 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2115 return (error); 2116 } 2117 2118 /* 2119 * Return interface configuration 2120 * of system. List may be used 2121 * in later ioctl's (above) to get 2122 * other information. 2123 */ 2124 /*ARGSUSED*/ 2125 static int 2126 ifconf(u_long cmd, caddr_t data) 2127 { 2128 struct ifconf *ifc = (struct ifconf *)data; 2129 #ifdef __amd64__ 2130 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 2131 struct ifconf ifc_swab; 2132 #endif 2133 struct ifnet *ifp; 2134 struct ifaddr *ifa; 2135 struct ifreq ifr; 2136 struct sbuf *sb; 2137 int error, full = 0, valid_len, max_len; 2138 2139 #ifdef __amd64__ 2140 if (cmd == SIOCGIFCONF32) { 2141 ifc_swab.ifc_len = ifc32->ifc_len; 2142 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 2143 ifc = &ifc_swab; 2144 } 2145 #endif 2146 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2147 max_len = MAXPHYS - 1; 2148 2149 /* Prevent hostile input from being able to crash the system */ 2150 if (ifc->ifc_len <= 0) 2151 return (EINVAL); 2152 2153 again: 2154 if (ifc->ifc_len <= max_len) { 2155 max_len = ifc->ifc_len; 2156 full = 1; 2157 } 2158 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2159 max_len = 0; 2160 valid_len = 0; 2161 2162 IFNET_RLOCK(); /* could sleep XXX */ 2163 TAILQ_FOREACH(ifp, &ifnet, if_link) { 2164 int addrs; 2165 2166 /* 2167 * Zero the ifr_name buffer to make sure we don't 2168 * disclose the contents of the stack. 2169 */ 2170 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2171 2172 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2173 >= sizeof(ifr.ifr_name)) { 2174 sbuf_delete(sb); 2175 IFNET_RUNLOCK(); 2176 return (ENAMETOOLONG); 2177 } 2178 2179 addrs = 0; 2180 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2181 struct sockaddr *sa = ifa->ifa_addr; 2182 2183 if (jailed(curthread->td_ucred) && 2184 prison_if(curthread->td_ucred, sa)) 2185 continue; 2186 addrs++; 2187 #ifdef COMPAT_43 2188 if (cmd == OSIOCGIFCONF) { 2189 struct osockaddr *osa = 2190 (struct osockaddr *)&ifr.ifr_addr; 2191 ifr.ifr_addr = *sa; 2192 osa->sa_family = sa->sa_family; 2193 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2194 max_len += sizeof(ifr); 2195 } else 2196 #endif 2197 if (sa->sa_len <= sizeof(*sa)) { 2198 ifr.ifr_addr = *sa; 2199 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2200 max_len += sizeof(ifr); 2201 } else { 2202 sbuf_bcat(sb, &ifr, 2203 offsetof(struct ifreq, ifr_addr)); 2204 max_len += offsetof(struct ifreq, ifr_addr); 2205 sbuf_bcat(sb, sa, sa->sa_len); 2206 max_len += sa->sa_len; 2207 } 2208 2209 if (!sbuf_overflowed(sb)) 2210 valid_len = sbuf_len(sb); 2211 } 2212 if (addrs == 0) { 2213 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2214 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2215 max_len += sizeof(ifr); 2216 2217 if (!sbuf_overflowed(sb)) 2218 valid_len = sbuf_len(sb); 2219 } 2220 } 2221 IFNET_RUNLOCK(); 2222 2223 /* 2224 * If we didn't allocate enough space (uncommon), try again. If 2225 * we have already allocated as much space as we are allowed, 2226 * return what we've got. 2227 */ 2228 if (valid_len != max_len && !full) { 2229 sbuf_delete(sb); 2230 goto again; 2231 } 2232 2233 ifc->ifc_len = valid_len; 2234 #ifdef __amd64__ 2235 if (cmd == SIOCGIFCONF32) 2236 ifc32->ifc_len = valid_len; 2237 #endif 2238 sbuf_finish(sb); 2239 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2240 sbuf_delete(sb); 2241 return (error); 2242 } 2243 2244 /* 2245 * Just like ifpromisc(), but for all-multicast-reception mode. 2246 */ 2247 int 2248 if_allmulti(struct ifnet *ifp, int onswitch) 2249 { 2250 2251 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2252 } 2253 2254 struct ifmultiaddr * 2255 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2256 { 2257 struct ifmultiaddr *ifma; 2258 2259 IF_ADDR_LOCK_ASSERT(ifp); 2260 2261 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2262 if (sa->sa_family == AF_LINK) { 2263 if (sa_dl_equal(ifma->ifma_addr, sa)) 2264 break; 2265 } else { 2266 if (sa_equal(ifma->ifma_addr, sa)) 2267 break; 2268 } 2269 } 2270 2271 return ifma; 2272 } 2273 2274 /* 2275 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2276 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2277 * the ifnet multicast address list here, so the caller must do that and 2278 * other setup work (such as notifying the device driver). The reference 2279 * count is initialized to 1. 2280 */ 2281 static struct ifmultiaddr * 2282 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2283 int mflags) 2284 { 2285 struct ifmultiaddr *ifma; 2286 struct sockaddr *dupsa; 2287 2288 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags | 2289 M_ZERO); 2290 if (ifma == NULL) 2291 return (NULL); 2292 2293 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags); 2294 if (dupsa == NULL) { 2295 FREE(ifma, M_IFMADDR); 2296 return (NULL); 2297 } 2298 bcopy(sa, dupsa, sa->sa_len); 2299 ifma->ifma_addr = dupsa; 2300 2301 ifma->ifma_ifp = ifp; 2302 ifma->ifma_refcount = 1; 2303 ifma->ifma_protospec = NULL; 2304 2305 if (llsa == NULL) { 2306 ifma->ifma_lladdr = NULL; 2307 return (ifma); 2308 } 2309 2310 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags); 2311 if (dupsa == NULL) { 2312 FREE(ifma->ifma_addr, M_IFMADDR); 2313 FREE(ifma, M_IFMADDR); 2314 return (NULL); 2315 } 2316 bcopy(llsa, dupsa, llsa->sa_len); 2317 ifma->ifma_lladdr = dupsa; 2318 2319 return (ifma); 2320 } 2321 2322 /* 2323 * if_freemulti: free ifmultiaddr structure and possibly attached related 2324 * addresses. The caller is responsible for implementing reference 2325 * counting, notifying the driver, handling routing messages, and releasing 2326 * any dependent link layer state. 2327 */ 2328 static void 2329 if_freemulti(struct ifmultiaddr *ifma) 2330 { 2331 2332 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2333 ifma->ifma_refcount)); 2334 KASSERT(ifma->ifma_protospec == NULL, 2335 ("if_freemulti: protospec not NULL")); 2336 2337 if (ifma->ifma_lladdr != NULL) 2338 FREE(ifma->ifma_lladdr, M_IFMADDR); 2339 FREE(ifma->ifma_addr, M_IFMADDR); 2340 FREE(ifma, M_IFMADDR); 2341 } 2342 2343 /* 2344 * Register an additional multicast address with a network interface. 2345 * 2346 * - If the address is already present, bump the reference count on the 2347 * address and return. 2348 * - If the address is not link-layer, look up a link layer address. 2349 * - Allocate address structures for one or both addresses, and attach to the 2350 * multicast address list on the interface. If automatically adding a link 2351 * layer address, the protocol address will own a reference to the link 2352 * layer address, to be freed when it is freed. 2353 * - Notify the network device driver of an addition to the multicast address 2354 * list. 2355 * 2356 * 'sa' points to caller-owned memory with the desired multicast address. 2357 * 2358 * 'retifma' will be used to return a pointer to the resulting multicast 2359 * address reference, if desired. 2360 */ 2361 int 2362 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2363 struct ifmultiaddr **retifma) 2364 { 2365 struct ifmultiaddr *ifma, *ll_ifma; 2366 struct sockaddr *llsa; 2367 int error; 2368 2369 /* 2370 * If the address is already present, return a new reference to it; 2371 * otherwise, allocate storage and set up a new address. 2372 */ 2373 IF_ADDR_LOCK(ifp); 2374 ifma = if_findmulti(ifp, sa); 2375 if (ifma != NULL) { 2376 ifma->ifma_refcount++; 2377 if (retifma != NULL) 2378 *retifma = ifma; 2379 IF_ADDR_UNLOCK(ifp); 2380 return (0); 2381 } 2382 2383 /* 2384 * The address isn't already present; resolve the protocol address 2385 * into a link layer address, and then look that up, bump its 2386 * refcount or allocate an ifma for that also. If 'llsa' was 2387 * returned, we will need to free it later. 2388 */ 2389 llsa = NULL; 2390 ll_ifma = NULL; 2391 if (ifp->if_resolvemulti != NULL) { 2392 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2393 if (error) 2394 goto unlock_out; 2395 } 2396 2397 /* 2398 * Allocate the new address. Don't hook it up yet, as we may also 2399 * need to allocate a link layer multicast address. 2400 */ 2401 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2402 if (ifma == NULL) { 2403 error = ENOMEM; 2404 goto free_llsa_out; 2405 } 2406 2407 /* 2408 * If a link layer address is found, we'll need to see if it's 2409 * already present in the address list, or allocate is as well. 2410 * When this block finishes, the link layer address will be on the 2411 * list. 2412 */ 2413 if (llsa != NULL) { 2414 ll_ifma = if_findmulti(ifp, llsa); 2415 if (ll_ifma == NULL) { 2416 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2417 if (ll_ifma == NULL) { 2418 --ifma->ifma_refcount; 2419 if_freemulti(ifma); 2420 error = ENOMEM; 2421 goto free_llsa_out; 2422 } 2423 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2424 ifma_link); 2425 } else 2426 ll_ifma->ifma_refcount++; 2427 ifma->ifma_llifma = ll_ifma; 2428 } 2429 2430 /* 2431 * We now have a new multicast address, ifma, and possibly a new or 2432 * referenced link layer address. Add the primary address to the 2433 * ifnet address list. 2434 */ 2435 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2436 2437 if (retifma != NULL) 2438 *retifma = ifma; 2439 2440 /* 2441 * Must generate the message while holding the lock so that 'ifma' 2442 * pointer is still valid. 2443 */ 2444 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2445 IF_ADDR_UNLOCK(ifp); 2446 2447 /* 2448 * We are certain we have added something, so call down to the 2449 * interface to let them know about it. 2450 */ 2451 if (ifp->if_ioctl != NULL) { 2452 IFF_LOCKGIANT(ifp); 2453 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2454 IFF_UNLOCKGIANT(ifp); 2455 } 2456 2457 if (llsa != NULL) 2458 FREE(llsa, M_IFMADDR); 2459 2460 return (0); 2461 2462 free_llsa_out: 2463 if (llsa != NULL) 2464 FREE(llsa, M_IFMADDR); 2465 2466 unlock_out: 2467 IF_ADDR_UNLOCK(ifp); 2468 return (error); 2469 } 2470 2471 /* 2472 * Delete a multicast group membership by network-layer group address. 2473 * 2474 * Returns ENOENT if the entry could not be found. If ifp no longer 2475 * exists, results are undefined. This entry point should only be used 2476 * from subsystems which do appropriate locking to hold ifp for the 2477 * duration of the call. 2478 * Network-layer protocol domains must use if_delmulti_ifma(). 2479 */ 2480 int 2481 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2482 { 2483 struct ifmultiaddr *ifma; 2484 int lastref; 2485 #ifdef INVARIANTS 2486 struct ifnet *oifp; 2487 2488 IFNET_RLOCK(); 2489 TAILQ_FOREACH(oifp, &ifnet, if_link) 2490 if (ifp == oifp) 2491 break; 2492 if (ifp != oifp) 2493 ifp = NULL; 2494 IFNET_RUNLOCK(); 2495 2496 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 2497 #endif 2498 if (ifp == NULL) 2499 return (ENOENT); 2500 2501 IF_ADDR_LOCK(ifp); 2502 lastref = 0; 2503 ifma = if_findmulti(ifp, sa); 2504 if (ifma != NULL) 2505 lastref = if_delmulti_locked(ifp, ifma, 0); 2506 IF_ADDR_UNLOCK(ifp); 2507 2508 if (ifma == NULL) 2509 return (ENOENT); 2510 2511 if (lastref && ifp->if_ioctl != NULL) { 2512 IFF_LOCKGIANT(ifp); 2513 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2514 IFF_UNLOCKGIANT(ifp); 2515 } 2516 2517 return (0); 2518 } 2519 2520 /* 2521 * Delete a multicast group membership by group membership pointer. 2522 * Network-layer protocol domains must use this routine. 2523 * 2524 * It is safe to call this routine if the ifp disappeared. Callers should 2525 * hold IFF_LOCKGIANT() to avoid a LOR in case the hardware needs to be 2526 * reconfigured. 2527 */ 2528 void 2529 if_delmulti_ifma(struct ifmultiaddr *ifma) 2530 { 2531 struct ifnet *ifp; 2532 int lastref; 2533 2534 ifp = ifma->ifma_ifp; 2535 #ifdef DIAGNOSTIC 2536 if (ifp == NULL) { 2537 printf("%s: ifma_ifp seems to be detached\n", __func__); 2538 } else { 2539 struct ifnet *oifp; 2540 2541 IFNET_RLOCK(); 2542 TAILQ_FOREACH(oifp, &ifnet, if_link) 2543 if (ifp == oifp) 2544 break; 2545 if (ifp != oifp) { 2546 printf("%s: ifnet %p disappeared\n", __func__, ifp); 2547 ifp = NULL; 2548 } 2549 IFNET_RUNLOCK(); 2550 } 2551 #endif 2552 /* 2553 * If and only if the ifnet instance exists: Acquire the address lock. 2554 */ 2555 if (ifp != NULL) 2556 IF_ADDR_LOCK(ifp); 2557 2558 lastref = if_delmulti_locked(ifp, ifma, 0); 2559 2560 if (ifp != NULL) { 2561 /* 2562 * If and only if the ifnet instance exists: 2563 * Release the address lock. 2564 * If the group was left: update the hardware hash filter. 2565 */ 2566 IF_ADDR_UNLOCK(ifp); 2567 if (lastref && ifp->if_ioctl != NULL) { 2568 IFF_LOCKGIANT(ifp); 2569 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2570 IFF_UNLOCKGIANT(ifp); 2571 } 2572 } 2573 } 2574 2575 /* 2576 * Perform deletion of network-layer and/or link-layer multicast address. 2577 * 2578 * Return 0 if the reference count was decremented. 2579 * Return 1 if the final reference was released, indicating that the 2580 * hardware hash filter should be reprogrammed. 2581 */ 2582 static int 2583 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 2584 { 2585 struct ifmultiaddr *ll_ifma; 2586 2587 if (ifp != NULL && ifma->ifma_ifp != NULL) { 2588 KASSERT(ifma->ifma_ifp == ifp, 2589 ("%s: inconsistent ifp %p", __func__, ifp)); 2590 IF_ADDR_LOCK_ASSERT(ifp); 2591 } 2592 2593 ifp = ifma->ifma_ifp; 2594 2595 /* 2596 * If the ifnet is detaching, null out references to ifnet, 2597 * so that upper protocol layers will notice, and not attempt 2598 * to obtain locks for an ifnet which no longer exists. The 2599 * routing socket announcement must happen before the ifnet 2600 * instance is detached from the system. 2601 */ 2602 if (detaching) { 2603 #ifdef DIAGNOSTIC 2604 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 2605 #endif 2606 /* 2607 * ifp may already be nulled out if we are being reentered 2608 * to delete the ll_ifma. 2609 */ 2610 if (ifp != NULL) { 2611 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2612 ifma->ifma_ifp = NULL; 2613 } 2614 } 2615 2616 if (--ifma->ifma_refcount > 0) 2617 return 0; 2618 2619 /* 2620 * If this ifma is a network-layer ifma, a link-layer ifma may 2621 * have been associated with it. Release it first if so. 2622 */ 2623 ll_ifma = ifma->ifma_llifma; 2624 if (ll_ifma != NULL) { 2625 KASSERT(ifma->ifma_lladdr != NULL, 2626 ("%s: llifma w/o lladdr", __func__)); 2627 if (detaching) 2628 ll_ifma->ifma_ifp = NULL; /* XXX */ 2629 if (--ll_ifma->ifma_refcount == 0) { 2630 if (ifp != NULL) { 2631 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 2632 ifma_link); 2633 } 2634 if_freemulti(ll_ifma); 2635 } 2636 } 2637 2638 if (ifp != NULL) 2639 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2640 2641 if_freemulti(ifma); 2642 2643 /* 2644 * The last reference to this instance of struct ifmultiaddr 2645 * was released; the hardware should be notified of this change. 2646 */ 2647 return 1; 2648 } 2649 2650 /* 2651 * Set the link layer address on an interface. 2652 * 2653 * At this time we only support certain types of interfaces, 2654 * and we don't allow the length of the address to change. 2655 */ 2656 int 2657 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2658 { 2659 struct sockaddr_dl *sdl; 2660 struct ifaddr *ifa; 2661 struct ifreq ifr; 2662 2663 ifa = ifp->if_addr; 2664 if (ifa == NULL) 2665 return (EINVAL); 2666 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2667 if (sdl == NULL) 2668 return (EINVAL); 2669 if (len != sdl->sdl_alen) /* don't allow length to change */ 2670 return (EINVAL); 2671 switch (ifp->if_type) { 2672 case IFT_ETHER: 2673 case IFT_FDDI: 2674 case IFT_XETHER: 2675 case IFT_ISO88025: 2676 case IFT_L2VLAN: 2677 case IFT_BRIDGE: 2678 case IFT_ARCNET: 2679 case IFT_IEEE8023ADLAG: 2680 bcopy(lladdr, LLADDR(sdl), len); 2681 break; 2682 default: 2683 return (ENODEV); 2684 } 2685 /* 2686 * If the interface is already up, we need 2687 * to re-init it in order to reprogram its 2688 * address filter. 2689 */ 2690 if ((ifp->if_flags & IFF_UP) != 0) { 2691 if (ifp->if_ioctl) { 2692 IFF_LOCKGIANT(ifp); 2693 ifp->if_flags &= ~IFF_UP; 2694 ifr.ifr_flags = ifp->if_flags & 0xffff; 2695 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2696 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2697 ifp->if_flags |= IFF_UP; 2698 ifr.ifr_flags = ifp->if_flags & 0xffff; 2699 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2700 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2701 IFF_UNLOCKGIANT(ifp); 2702 } 2703 #ifdef INET 2704 /* 2705 * Also send gratuitous ARPs to notify other nodes about 2706 * the address change. 2707 */ 2708 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2709 if (ifa->ifa_addr->sa_family == AF_INET) 2710 arp_ifinit(ifp, ifa); 2711 } 2712 #endif 2713 } 2714 return (0); 2715 } 2716 2717 /* 2718 * The name argument must be a pointer to storage which will last as 2719 * long as the interface does. For physical devices, the result of 2720 * device_get_name(dev) is a good choice and for pseudo-devices a 2721 * static string works well. 2722 */ 2723 void 2724 if_initname(struct ifnet *ifp, const char *name, int unit) 2725 { 2726 ifp->if_dname = name; 2727 ifp->if_dunit = unit; 2728 if (unit != IF_DUNIT_NONE) 2729 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2730 else 2731 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2732 } 2733 2734 int 2735 if_printf(struct ifnet *ifp, const char * fmt, ...) 2736 { 2737 va_list ap; 2738 int retval; 2739 2740 retval = printf("%s: ", ifp->if_xname); 2741 va_start(ap, fmt); 2742 retval += vprintf(fmt, ap); 2743 va_end(ap); 2744 return (retval); 2745 } 2746 2747 /* 2748 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 2749 * be called without Giant. However, we often can't acquire the Giant lock 2750 * at those points; instead, we run it via a task queue that holds Giant via 2751 * if_start_deferred. 2752 * 2753 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 2754 * outstanding if_start_deferred() tasks that will run after the free. This 2755 * probably means waiting in if_detach(). 2756 */ 2757 void 2758 if_start(struct ifnet *ifp) 2759 { 2760 2761 if (ifp->if_flags & IFF_NEEDSGIANT) { 2762 if (mtx_owned(&Giant)) 2763 (*(ifp)->if_start)(ifp); 2764 else 2765 taskqueue_enqueue(taskqueue_swi_giant, 2766 &ifp->if_starttask); 2767 } else 2768 (*(ifp)->if_start)(ifp); 2769 } 2770 2771 static void 2772 if_start_deferred(void *context, int pending) 2773 { 2774 struct ifnet *ifp; 2775 2776 GIANT_REQUIRED; 2777 2778 ifp = context; 2779 (ifp->if_start)(ifp); 2780 } 2781 2782 int 2783 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2784 { 2785 int active = 0; 2786 2787 IF_LOCK(ifq); 2788 if (_IF_QFULL(ifq)) { 2789 _IF_DROP(ifq); 2790 IF_UNLOCK(ifq); 2791 m_freem(m); 2792 return (0); 2793 } 2794 if (ifp != NULL) { 2795 ifp->if_obytes += m->m_pkthdr.len + adjust; 2796 if (m->m_flags & (M_BCAST|M_MCAST)) 2797 ifp->if_omcasts++; 2798 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2799 } 2800 _IF_ENQUEUE(ifq, m); 2801 IF_UNLOCK(ifq); 2802 if (ifp != NULL && !active) 2803 if_start(ifp); 2804 return (1); 2805 } 2806 2807 void 2808 if_register_com_alloc(u_char type, 2809 if_com_alloc_t *a, if_com_free_t *f) 2810 { 2811 2812 KASSERT(if_com_alloc[type] == NULL, 2813 ("if_register_com_alloc: %d already registered", type)); 2814 KASSERT(if_com_free[type] == NULL, 2815 ("if_register_com_alloc: %d free already registered", type)); 2816 2817 if_com_alloc[type] = a; 2818 if_com_free[type] = f; 2819 } 2820 2821 void 2822 if_deregister_com_alloc(u_char type) 2823 { 2824 2825 KASSERT(if_com_alloc[type] != NULL, 2826 ("if_deregister_com_alloc: %d not registered", type)); 2827 KASSERT(if_com_free[type] != NULL, 2828 ("if_deregister_com_alloc: %d free not registered", type)); 2829 if_com_alloc[type] = NULL; 2830 if_com_free[type] = NULL; 2831 }
Cache object: d266e9bc1f5bd5b0fd0b92458893cb0f
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