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: releng/10.1/sys/net/if.c 269046 2014-07-24 06:02:03Z kevlo $ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/conf.h> 40 #include <sys/malloc.h> 41 #include <sys/sbuf.h> 42 #include <sys/bus.h> 43 #include <sys/mbuf.h> 44 #include <sys/systm.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/protosw.h> 50 #include <sys/kernel.h> 51 #include <sys/lock.h> 52 #include <sys/refcount.h> 53 #include <sys/module.h> 54 #include <sys/rwlock.h> 55 #include <sys/sockio.h> 56 #include <sys/syslog.h> 57 #include <sys/sysctl.h> 58 #include <sys/taskqueue.h> 59 #include <sys/domain.h> 60 #include <sys/jail.h> 61 #include <sys/priv.h> 62 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 #include <net/ethernet.h> 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 #include <netinet/ip.h> 81 #include <netinet/ip_carp.h> 82 #ifdef INET 83 #include <netinet/if_ether.h> 84 #endif /* INET */ 85 #ifdef INET6 86 #include <netinet6/in6_var.h> 87 #include <netinet6/in6_ifattach.h> 88 #endif /* INET6 */ 89 #endif /* INET || INET6 */ 90 91 #include <security/mac/mac_framework.h> 92 93 #ifdef COMPAT_FREEBSD32 94 #include <sys/mount.h> 95 #include <compat/freebsd32/freebsd32.h> 96 #endif 97 98 struct ifindex_entry { 99 struct ifnet *ife_ifnet; 100 }; 101 102 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 103 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 104 105 TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen); 106 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 107 &ifqmaxlen, 0, "max send queue size"); 108 109 /* Log link state change events */ 110 static int log_link_state_change = 1; 111 112 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 113 &log_link_state_change, 0, 114 "log interface link state change events"); 115 116 /* Interface description */ 117 static unsigned int ifdescr_maxlen = 1024; 118 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 119 &ifdescr_maxlen, 0, 120 "administrative maximum length for interface description"); 121 122 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 123 124 /* global sx for non-critical path ifdescr */ 125 static struct sx ifdescr_sx; 126 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 127 128 void (*bridge_linkstate_p)(struct ifnet *ifp); 129 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 130 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 131 /* These are external hooks for CARP. */ 132 void (*carp_linkstate_p)(struct ifnet *ifp); 133 void (*carp_demote_adj_p)(int, char *); 134 int (*carp_master_p)(struct ifaddr *); 135 #if defined(INET) || defined(INET6) 136 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 137 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 138 const struct sockaddr *sa); 139 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 140 int (*carp_attach_p)(struct ifaddr *, int); 141 void (*carp_detach_p)(struct ifaddr *); 142 #endif 143 #ifdef INET 144 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 145 #endif 146 #ifdef INET6 147 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 148 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 149 const struct in6_addr *taddr); 150 #endif 151 152 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 153 154 /* 155 * XXX: Style; these should be sorted alphabetically, and unprototyped 156 * static functions should be prototyped. Currently they are sorted by 157 * declaration order. 158 */ 159 static void if_attachdomain(void *); 160 static void if_attachdomain1(struct ifnet *); 161 static int ifconf(u_long, caddr_t); 162 static void if_freemulti(struct ifmultiaddr *); 163 static void if_init(void *); 164 static void if_grow(void); 165 static void if_route(struct ifnet *, int flag, int fam); 166 static int if_setflag(struct ifnet *, int, int, int *, int); 167 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 168 static void if_unroute(struct ifnet *, int flag, int fam); 169 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 170 static int if_rtdel(struct radix_node *, void *); 171 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 172 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 173 static void do_link_state_change(void *, int); 174 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 175 static int if_getgroupmembers(struct ifgroupreq *); 176 static void if_delgroups(struct ifnet *); 177 static void if_attach_internal(struct ifnet *, int); 178 static void if_detach_internal(struct ifnet *, int); 179 180 #ifdef INET6 181 /* 182 * XXX: declare here to avoid to include many inet6 related files.. 183 * should be more generalized? 184 */ 185 extern void nd6_setmtu(struct ifnet *); 186 #endif 187 188 VNET_DEFINE(int, if_index); 189 int ifqmaxlen = IFQ_MAXLEN; 190 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 191 VNET_DEFINE(struct ifgrouphead, ifg_head); 192 193 static VNET_DEFINE(int, if_indexlim) = 8; 194 195 /* Table of ifnet by index. */ 196 VNET_DEFINE(struct ifindex_entry *, ifindex_table); 197 198 #define V_if_indexlim VNET(if_indexlim) 199 #define V_ifindex_table VNET(ifindex_table) 200 201 /* 202 * The global network interface list (V_ifnet) and related state (such as 203 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 204 * an rwlock. Either may be acquired shared to stablize the list, but both 205 * must be acquired writable to modify the list. This model allows us to 206 * both stablize the interface list during interrupt thread processing, but 207 * also to stablize it over long-running ioctls, without introducing priority 208 * inversions and deadlocks. 209 */ 210 struct rwlock ifnet_rwlock; 211 struct sx ifnet_sxlock; 212 213 /* 214 * The allocation of network interfaces is a rather non-atomic affair; we 215 * need to select an index before we are ready to expose the interface for 216 * use, so will use this pointer value to indicate reservation. 217 */ 218 #define IFNET_HOLD (void *)(uintptr_t)(-1) 219 220 static if_com_alloc_t *if_com_alloc[256]; 221 static if_com_free_t *if_com_free[256]; 222 223 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 224 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 225 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 226 227 struct ifnet * 228 ifnet_byindex_locked(u_short idx) 229 { 230 231 if (idx > V_if_index) 232 return (NULL); 233 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 234 return (NULL); 235 return (V_ifindex_table[idx].ife_ifnet); 236 } 237 238 struct ifnet * 239 ifnet_byindex(u_short idx) 240 { 241 struct ifnet *ifp; 242 243 IFNET_RLOCK_NOSLEEP(); 244 ifp = ifnet_byindex_locked(idx); 245 IFNET_RUNLOCK_NOSLEEP(); 246 return (ifp); 247 } 248 249 struct ifnet * 250 ifnet_byindex_ref(u_short idx) 251 { 252 struct ifnet *ifp; 253 254 IFNET_RLOCK_NOSLEEP(); 255 ifp = ifnet_byindex_locked(idx); 256 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 257 IFNET_RUNLOCK_NOSLEEP(); 258 return (NULL); 259 } 260 if_ref(ifp); 261 IFNET_RUNLOCK_NOSLEEP(); 262 return (ifp); 263 } 264 265 /* 266 * Allocate an ifindex array entry; return 0 on success or an error on 267 * failure. 268 */ 269 static int 270 ifindex_alloc_locked(u_short *idxp) 271 { 272 u_short idx; 273 274 IFNET_WLOCK_ASSERT(); 275 276 retry: 277 /* 278 * Try to find an empty slot below V_if_index. If we fail, take the 279 * next slot. 280 */ 281 for (idx = 1; idx <= V_if_index; idx++) { 282 if (V_ifindex_table[idx].ife_ifnet == NULL) 283 break; 284 } 285 286 /* Catch if_index overflow. */ 287 if (idx < 1) 288 return (ENOSPC); 289 if (idx >= V_if_indexlim) { 290 if_grow(); 291 goto retry; 292 } 293 if (idx > V_if_index) 294 V_if_index = idx; 295 *idxp = idx; 296 return (0); 297 } 298 299 static void 300 ifindex_free_locked(u_short idx) 301 { 302 303 IFNET_WLOCK_ASSERT(); 304 305 V_ifindex_table[idx].ife_ifnet = NULL; 306 while (V_if_index > 0 && 307 V_ifindex_table[V_if_index].ife_ifnet == NULL) 308 V_if_index--; 309 } 310 311 static void 312 ifindex_free(u_short idx) 313 { 314 315 IFNET_WLOCK(); 316 ifindex_free_locked(idx); 317 IFNET_WUNLOCK(); 318 } 319 320 static void 321 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 322 { 323 324 IFNET_WLOCK_ASSERT(); 325 326 V_ifindex_table[idx].ife_ifnet = ifp; 327 } 328 329 static void 330 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 331 { 332 333 IFNET_WLOCK(); 334 ifnet_setbyindex_locked(idx, ifp); 335 IFNET_WUNLOCK(); 336 } 337 338 struct ifaddr * 339 ifaddr_byindex(u_short idx) 340 { 341 struct ifaddr *ifa; 342 343 IFNET_RLOCK_NOSLEEP(); 344 ifa = ifnet_byindex_locked(idx)->if_addr; 345 if (ifa != NULL) 346 ifa_ref(ifa); 347 IFNET_RUNLOCK_NOSLEEP(); 348 return (ifa); 349 } 350 351 /* 352 * Network interface utility routines. 353 * 354 * Routines with ifa_ifwith* names take sockaddr *'s as 355 * parameters. 356 */ 357 358 static void 359 vnet_if_init(const void *unused __unused) 360 { 361 362 TAILQ_INIT(&V_ifnet); 363 TAILQ_INIT(&V_ifg_head); 364 IFNET_WLOCK(); 365 if_grow(); /* create initial table */ 366 IFNET_WUNLOCK(); 367 vnet_if_clone_init(); 368 } 369 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 370 NULL); 371 372 /* ARGSUSED*/ 373 static void 374 if_init(void *dummy __unused) 375 { 376 377 IFNET_LOCK_INIT(); 378 if_clone_init(); 379 } 380 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 381 382 383 #ifdef VIMAGE 384 static void 385 vnet_if_uninit(const void *unused __unused) 386 { 387 388 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 389 "not empty", __func__, __LINE__, &V_ifnet)); 390 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 391 "not empty", __func__, __LINE__, &V_ifg_head)); 392 393 free((caddr_t)V_ifindex_table, M_IFNET); 394 } 395 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 396 vnet_if_uninit, NULL); 397 #endif 398 399 static void 400 if_grow(void) 401 { 402 int oldlim; 403 u_int n; 404 struct ifindex_entry *e; 405 406 IFNET_WLOCK_ASSERT(); 407 oldlim = V_if_indexlim; 408 IFNET_WUNLOCK(); 409 n = (oldlim << 1) * sizeof(*e); 410 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 411 IFNET_WLOCK(); 412 if (V_if_indexlim != oldlim) { 413 free(e, M_IFNET); 414 return; 415 } 416 if (V_ifindex_table != NULL) { 417 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 418 free((caddr_t)V_ifindex_table, M_IFNET); 419 } 420 V_if_indexlim <<= 1; 421 V_ifindex_table = e; 422 } 423 424 /* 425 * Allocate a struct ifnet and an index for an interface. A layer 2 426 * common structure will also be allocated if an allocation routine is 427 * registered for the passed type. 428 */ 429 struct ifnet * 430 if_alloc(u_char type) 431 { 432 struct ifnet *ifp; 433 u_short idx; 434 435 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 436 IFNET_WLOCK(); 437 if (ifindex_alloc_locked(&idx) != 0) { 438 IFNET_WUNLOCK(); 439 free(ifp, M_IFNET); 440 return (NULL); 441 } 442 ifnet_setbyindex_locked(idx, IFNET_HOLD); 443 IFNET_WUNLOCK(); 444 ifp->if_index = idx; 445 ifp->if_type = type; 446 ifp->if_alloctype = type; 447 if (if_com_alloc[type] != NULL) { 448 ifp->if_l2com = if_com_alloc[type](type, ifp); 449 if (ifp->if_l2com == NULL) { 450 free(ifp, M_IFNET); 451 ifindex_free(idx); 452 return (NULL); 453 } 454 } 455 456 IF_ADDR_LOCK_INIT(ifp); 457 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 458 ifp->if_afdata_initialized = 0; 459 IF_AFDATA_LOCK_INIT(ifp); 460 TAILQ_INIT(&ifp->if_addrhead); 461 TAILQ_INIT(&ifp->if_multiaddrs); 462 TAILQ_INIT(&ifp->if_groups); 463 #ifdef MAC 464 mac_ifnet_init(ifp); 465 #endif 466 ifq_init(&ifp->if_snd, ifp); 467 468 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 469 ifnet_setbyindex(ifp->if_index, ifp); 470 return (ifp); 471 } 472 473 /* 474 * Do the actual work of freeing a struct ifnet, and layer 2 common 475 * structure. This call is made when the last reference to an 476 * interface is released. 477 */ 478 static void 479 if_free_internal(struct ifnet *ifp) 480 { 481 482 KASSERT((ifp->if_flags & IFF_DYING), 483 ("if_free_internal: interface not dying")); 484 485 if (if_com_free[ifp->if_alloctype] != NULL) 486 if_com_free[ifp->if_alloctype](ifp->if_l2com, 487 ifp->if_alloctype); 488 489 #ifdef MAC 490 mac_ifnet_destroy(ifp); 491 #endif /* MAC */ 492 if (ifp->if_description != NULL) 493 free(ifp->if_description, M_IFDESCR); 494 IF_AFDATA_DESTROY(ifp); 495 IF_ADDR_LOCK_DESTROY(ifp); 496 ifq_delete(&ifp->if_snd); 497 free(ifp, M_IFNET); 498 } 499 500 /* 501 * Deregister an interface and free the associated storage. 502 */ 503 void 504 if_free(struct ifnet *ifp) 505 { 506 507 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 508 509 CURVNET_SET_QUIET(ifp->if_vnet); 510 IFNET_WLOCK(); 511 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 512 ("%s: freeing unallocated ifnet", ifp->if_xname)); 513 514 ifindex_free_locked(ifp->if_index); 515 IFNET_WUNLOCK(); 516 517 if (refcount_release(&ifp->if_refcount)) 518 if_free_internal(ifp); 519 CURVNET_RESTORE(); 520 } 521 522 /* 523 * Interfaces to keep an ifnet type-stable despite the possibility of the 524 * driver calling if_free(). If there are additional references, we defer 525 * freeing the underlying data structure. 526 */ 527 void 528 if_ref(struct ifnet *ifp) 529 { 530 531 /* We don't assert the ifnet list lock here, but arguably should. */ 532 refcount_acquire(&ifp->if_refcount); 533 } 534 535 void 536 if_rele(struct ifnet *ifp) 537 { 538 539 if (!refcount_release(&ifp->if_refcount)) 540 return; 541 if_free_internal(ifp); 542 } 543 544 void 545 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 546 { 547 548 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 549 550 if (ifq->ifq_maxlen == 0) 551 ifq->ifq_maxlen = ifqmaxlen; 552 553 ifq->altq_type = 0; 554 ifq->altq_disc = NULL; 555 ifq->altq_flags &= ALTQF_CANTCHANGE; 556 ifq->altq_tbr = NULL; 557 ifq->altq_ifp = ifp; 558 } 559 560 void 561 ifq_delete(struct ifaltq *ifq) 562 { 563 mtx_destroy(&ifq->ifq_mtx); 564 } 565 566 /* 567 * Perform generic interface initalization tasks and attach the interface 568 * to the list of "active" interfaces. If vmove flag is set on entry 569 * to if_attach_internal(), perform only a limited subset of initialization 570 * tasks, given that we are moving from one vnet to another an ifnet which 571 * has already been fully initialized. 572 * 573 * XXX: 574 * - The decision to return void and thus require this function to 575 * succeed is questionable. 576 * - We should probably do more sanity checking. For instance we don't 577 * do anything to insure if_xname is unique or non-empty. 578 */ 579 void 580 if_attach(struct ifnet *ifp) 581 { 582 583 if_attach_internal(ifp, 0); 584 } 585 586 static void 587 if_attach_internal(struct ifnet *ifp, int vmove) 588 { 589 unsigned socksize, ifasize; 590 int namelen, masklen; 591 struct sockaddr_dl *sdl; 592 struct ifaddr *ifa; 593 594 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 595 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 596 ifp->if_xname); 597 598 #ifdef VIMAGE 599 ifp->if_vnet = curvnet; 600 if (ifp->if_home_vnet == NULL) 601 ifp->if_home_vnet = curvnet; 602 #endif 603 604 if_addgroup(ifp, IFG_ALL); 605 606 getmicrotime(&ifp->if_lastchange); 607 ifp->if_data.ifi_epoch = time_uptime; 608 ifp->if_data.ifi_datalen = sizeof(struct if_data); 609 610 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 611 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 612 ("transmit and qflush must both either be set or both be NULL")); 613 if (ifp->if_transmit == NULL) { 614 ifp->if_transmit = if_transmit; 615 ifp->if_qflush = if_qflush; 616 } 617 618 if (!vmove) { 619 #ifdef MAC 620 mac_ifnet_create(ifp); 621 #endif 622 623 /* 624 * Create a Link Level name for this device. 625 */ 626 namelen = strlen(ifp->if_xname); 627 /* 628 * Always save enough space for any possiable name so we 629 * can do a rename in place later. 630 */ 631 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 632 socksize = masklen + ifp->if_addrlen; 633 if (socksize < sizeof(*sdl)) 634 socksize = sizeof(*sdl); 635 socksize = roundup2(socksize, sizeof(long)); 636 ifasize = sizeof(*ifa) + 2 * socksize; 637 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 638 ifa_init(ifa); 639 sdl = (struct sockaddr_dl *)(ifa + 1); 640 sdl->sdl_len = socksize; 641 sdl->sdl_family = AF_LINK; 642 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 643 sdl->sdl_nlen = namelen; 644 sdl->sdl_index = ifp->if_index; 645 sdl->sdl_type = ifp->if_type; 646 ifp->if_addr = ifa; 647 ifa->ifa_ifp = ifp; 648 ifa->ifa_rtrequest = link_rtrequest; 649 ifa->ifa_addr = (struct sockaddr *)sdl; 650 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 651 ifa->ifa_netmask = (struct sockaddr *)sdl; 652 sdl->sdl_len = masklen; 653 while (namelen != 0) 654 sdl->sdl_data[--namelen] = 0xff; 655 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 656 /* Reliably crash if used uninitialized. */ 657 ifp->if_broadcastaddr = NULL; 658 659 #if defined(INET) || defined(INET6) 660 /* Initialize to max value. */ 661 if (ifp->if_hw_tsomax == 0) 662 ifp->if_hw_tsomax = min(IP_MAXPACKET, 32 * MCLBYTES - 663 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 664 KASSERT(ifp->if_hw_tsomax <= IP_MAXPACKET && 665 ifp->if_hw_tsomax >= IP_MAXPACKET / 8, 666 ("%s: tsomax outside of range", __func__)); 667 #endif 668 } 669 #ifdef VIMAGE 670 else { 671 /* 672 * Update the interface index in the link layer address 673 * of the interface. 674 */ 675 for (ifa = ifp->if_addr; ifa != NULL; 676 ifa = TAILQ_NEXT(ifa, ifa_link)) { 677 if (ifa->ifa_addr->sa_family == AF_LINK) { 678 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 679 sdl->sdl_index = ifp->if_index; 680 } 681 } 682 } 683 #endif 684 685 IFNET_WLOCK(); 686 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 687 #ifdef VIMAGE 688 curvnet->vnet_ifcnt++; 689 #endif 690 IFNET_WUNLOCK(); 691 692 if (domain_init_status >= 2) 693 if_attachdomain1(ifp); 694 695 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 696 if (IS_DEFAULT_VNET(curvnet)) 697 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 698 699 /* Announce the interface. */ 700 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 701 } 702 703 static void 704 if_attachdomain(void *dummy) 705 { 706 struct ifnet *ifp; 707 708 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 709 if_attachdomain1(ifp); 710 } 711 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 712 if_attachdomain, NULL); 713 714 static void 715 if_attachdomain1(struct ifnet *ifp) 716 { 717 struct domain *dp; 718 719 /* 720 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 721 * cannot lock ifp->if_afdata initialization, entirely. 722 */ 723 if (IF_AFDATA_TRYLOCK(ifp) == 0) 724 return; 725 if (ifp->if_afdata_initialized >= domain_init_status) { 726 IF_AFDATA_UNLOCK(ifp); 727 log(LOG_WARNING, "%s called more than once on %s\n", 728 __func__, ifp->if_xname); 729 return; 730 } 731 ifp->if_afdata_initialized = domain_init_status; 732 IF_AFDATA_UNLOCK(ifp); 733 734 /* address family dependent data region */ 735 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 736 for (dp = domains; dp; dp = dp->dom_next) { 737 if (dp->dom_ifattach) 738 ifp->if_afdata[dp->dom_family] = 739 (*dp->dom_ifattach)(ifp); 740 } 741 } 742 743 /* 744 * Remove any unicast or broadcast network addresses from an interface. 745 */ 746 void 747 if_purgeaddrs(struct ifnet *ifp) 748 { 749 struct ifaddr *ifa, *next; 750 751 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 752 if (ifa->ifa_addr->sa_family == AF_LINK) 753 continue; 754 #ifdef INET 755 /* XXX: Ugly!! ad hoc just for INET */ 756 if (ifa->ifa_addr->sa_family == AF_INET) { 757 struct ifaliasreq ifr; 758 759 bzero(&ifr, sizeof(ifr)); 760 ifr.ifra_addr = *ifa->ifa_addr; 761 if (ifa->ifa_dstaddr) 762 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 763 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 764 NULL) == 0) 765 continue; 766 } 767 #endif /* INET */ 768 #ifdef INET6 769 if (ifa->ifa_addr->sa_family == AF_INET6) { 770 in6_purgeaddr(ifa); 771 /* ifp_addrhead is already updated */ 772 continue; 773 } 774 #endif /* INET6 */ 775 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 776 ifa_free(ifa); 777 } 778 } 779 780 /* 781 * Remove any multicast network addresses from an interface when an ifnet 782 * is going away. 783 */ 784 static void 785 if_purgemaddrs(struct ifnet *ifp) 786 { 787 struct ifmultiaddr *ifma; 788 struct ifmultiaddr *next; 789 790 IF_ADDR_WLOCK(ifp); 791 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 792 if_delmulti_locked(ifp, ifma, 1); 793 IF_ADDR_WUNLOCK(ifp); 794 } 795 796 /* 797 * Detach an interface, removing it from the list of "active" interfaces. 798 * If vmove flag is set on entry to if_detach_internal(), perform only a 799 * limited subset of cleanup tasks, given that we are moving an ifnet from 800 * one vnet to another, where it must be fully operational. 801 * 802 * XXXRW: There are some significant questions about event ordering, and 803 * how to prevent things from starting to use the interface during detach. 804 */ 805 void 806 if_detach(struct ifnet *ifp) 807 { 808 809 CURVNET_SET_QUIET(ifp->if_vnet); 810 if_detach_internal(ifp, 0); 811 CURVNET_RESTORE(); 812 } 813 814 static void 815 if_detach_internal(struct ifnet *ifp, int vmove) 816 { 817 struct ifaddr *ifa; 818 struct radix_node_head *rnh; 819 int i, j; 820 struct domain *dp; 821 struct ifnet *iter; 822 int found = 0; 823 824 IFNET_WLOCK(); 825 TAILQ_FOREACH(iter, &V_ifnet, if_link) 826 if (iter == ifp) { 827 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 828 found = 1; 829 break; 830 } 831 #ifdef VIMAGE 832 if (found) 833 curvnet->vnet_ifcnt--; 834 #endif 835 IFNET_WUNLOCK(); 836 if (!found) { 837 if (vmove) 838 panic("%s: ifp=%p not on the ifnet tailq %p", 839 __func__, ifp, &V_ifnet); 840 else 841 return; /* XXX this should panic as well? */ 842 } 843 844 /* 845 * Remove/wait for pending events. 846 */ 847 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 848 849 /* 850 * Remove routes and flush queues. 851 */ 852 if_down(ifp); 853 #ifdef ALTQ 854 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 855 altq_disable(&ifp->if_snd); 856 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 857 altq_detach(&ifp->if_snd); 858 #endif 859 860 if_purgeaddrs(ifp); 861 862 #ifdef INET 863 in_ifdetach(ifp); 864 #endif 865 866 #ifdef INET6 867 /* 868 * Remove all IPv6 kernel structs related to ifp. This should be done 869 * before removing routing entries below, since IPv6 interface direct 870 * routes are expected to be removed by the IPv6-specific kernel API. 871 * Otherwise, the kernel will detect some inconsistency and bark it. 872 */ 873 in6_ifdetach(ifp); 874 #endif 875 if_purgemaddrs(ifp); 876 877 if (!vmove) { 878 /* 879 * Prevent further calls into the device driver via ifnet. 880 */ 881 if_dead(ifp); 882 883 /* 884 * Remove link ifaddr pointer and maybe decrement if_index. 885 * Clean up all addresses. 886 */ 887 ifp->if_addr = NULL; 888 889 /* We can now free link ifaddr. */ 890 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 891 ifa = TAILQ_FIRST(&ifp->if_addrhead); 892 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 893 ifa_free(ifa); 894 } 895 } 896 897 /* 898 * Delete all remaining routes using this interface 899 * Unfortuneatly the only way to do this is to slog through 900 * the entire routing table looking for routes which point 901 * to this interface...oh well... 902 */ 903 for (i = 1; i <= AF_MAX; i++) { 904 for (j = 0; j < rt_numfibs; j++) { 905 rnh = rt_tables_get_rnh(j, i); 906 if (rnh == NULL) 907 continue; 908 RADIX_NODE_HEAD_LOCK(rnh); 909 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 910 RADIX_NODE_HEAD_UNLOCK(rnh); 911 } 912 } 913 914 /* Announce that the interface is gone. */ 915 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 916 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 917 if (IS_DEFAULT_VNET(curvnet)) 918 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 919 if_delgroups(ifp); 920 921 /* 922 * We cannot hold the lock over dom_ifdetach calls as they might 923 * sleep, for example trying to drain a callout, thus open up the 924 * theoretical race with re-attaching. 925 */ 926 IF_AFDATA_LOCK(ifp); 927 i = ifp->if_afdata_initialized; 928 ifp->if_afdata_initialized = 0; 929 IF_AFDATA_UNLOCK(ifp); 930 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 931 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 932 (*dp->dom_ifdetach)(ifp, 933 ifp->if_afdata[dp->dom_family]); 934 } 935 } 936 937 #ifdef VIMAGE 938 /* 939 * if_vmove() performs a limited version of if_detach() in current 940 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 941 * An attempt is made to shrink if_index in current vnet, find an 942 * unused if_index in target vnet and calls if_grow() if necessary, 943 * and finally find an unused if_xname for the target vnet. 944 */ 945 void 946 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 947 { 948 u_short idx; 949 950 /* 951 * Detach from current vnet, but preserve LLADDR info, do not 952 * mark as dead etc. so that the ifnet can be reattached later. 953 */ 954 if_detach_internal(ifp, 1); 955 956 /* 957 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 958 * the if_index for that vnet if possible. 959 * 960 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 961 * or we'd lock on one vnet and unlock on another. 962 */ 963 IFNET_WLOCK(); 964 ifindex_free_locked(ifp->if_index); 965 IFNET_WUNLOCK(); 966 967 /* 968 * Perform interface-specific reassignment tasks, if provided by 969 * the driver. 970 */ 971 if (ifp->if_reassign != NULL) 972 ifp->if_reassign(ifp, new_vnet, NULL); 973 974 /* 975 * Switch to the context of the target vnet. 976 */ 977 CURVNET_SET_QUIET(new_vnet); 978 979 IFNET_WLOCK(); 980 if (ifindex_alloc_locked(&idx) != 0) { 981 IFNET_WUNLOCK(); 982 panic("if_index overflow"); 983 } 984 ifp->if_index = idx; 985 ifnet_setbyindex_locked(ifp->if_index, ifp); 986 IFNET_WUNLOCK(); 987 988 if_attach_internal(ifp, 1); 989 990 CURVNET_RESTORE(); 991 } 992 993 /* 994 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 995 */ 996 static int 997 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 998 { 999 struct prison *pr; 1000 struct ifnet *difp; 1001 1002 /* Try to find the prison within our visibility. */ 1003 sx_slock(&allprison_lock); 1004 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1005 sx_sunlock(&allprison_lock); 1006 if (pr == NULL) 1007 return (ENXIO); 1008 prison_hold_locked(pr); 1009 mtx_unlock(&pr->pr_mtx); 1010 1011 /* Do not try to move the iface from and to the same prison. */ 1012 if (pr->pr_vnet == ifp->if_vnet) { 1013 prison_free(pr); 1014 return (EEXIST); 1015 } 1016 1017 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1018 /* XXX Lock interfaces to avoid races. */ 1019 CURVNET_SET_QUIET(pr->pr_vnet); 1020 difp = ifunit(ifname); 1021 CURVNET_RESTORE(); 1022 if (difp != NULL) { 1023 prison_free(pr); 1024 return (EEXIST); 1025 } 1026 1027 /* Move the interface into the child jail/vnet. */ 1028 if_vmove(ifp, pr->pr_vnet); 1029 1030 /* Report the new if_xname back to the userland. */ 1031 sprintf(ifname, "%s", ifp->if_xname); 1032 1033 prison_free(pr); 1034 return (0); 1035 } 1036 1037 static int 1038 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1039 { 1040 struct prison *pr; 1041 struct vnet *vnet_dst; 1042 struct ifnet *ifp; 1043 1044 /* Try to find the prison within our visibility. */ 1045 sx_slock(&allprison_lock); 1046 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1047 sx_sunlock(&allprison_lock); 1048 if (pr == NULL) 1049 return (ENXIO); 1050 prison_hold_locked(pr); 1051 mtx_unlock(&pr->pr_mtx); 1052 1053 /* Make sure the named iface exists in the source prison/vnet. */ 1054 CURVNET_SET(pr->pr_vnet); 1055 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1056 if (ifp == NULL) { 1057 CURVNET_RESTORE(); 1058 prison_free(pr); 1059 return (ENXIO); 1060 } 1061 1062 /* Do not try to move the iface from and to the same prison. */ 1063 vnet_dst = TD_TO_VNET(td); 1064 if (vnet_dst == ifp->if_vnet) { 1065 CURVNET_RESTORE(); 1066 prison_free(pr); 1067 return (EEXIST); 1068 } 1069 1070 /* Get interface back from child jail/vnet. */ 1071 if_vmove(ifp, vnet_dst); 1072 CURVNET_RESTORE(); 1073 1074 /* Report the new if_xname back to the userland. */ 1075 sprintf(ifname, "%s", ifp->if_xname); 1076 1077 prison_free(pr); 1078 return (0); 1079 } 1080 #endif /* VIMAGE */ 1081 1082 /* 1083 * Add a group to an interface 1084 */ 1085 int 1086 if_addgroup(struct ifnet *ifp, const char *groupname) 1087 { 1088 struct ifg_list *ifgl; 1089 struct ifg_group *ifg = NULL; 1090 struct ifg_member *ifgm; 1091 int new = 0; 1092 1093 if (groupname[0] && groupname[strlen(groupname) - 1] >= '' && 1094 groupname[strlen(groupname) - 1] <= '9') 1095 return (EINVAL); 1096 1097 IFNET_WLOCK(); 1098 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1099 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1100 IFNET_WUNLOCK(); 1101 return (EEXIST); 1102 } 1103 1104 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1105 M_NOWAIT)) == NULL) { 1106 IFNET_WUNLOCK(); 1107 return (ENOMEM); 1108 } 1109 1110 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1111 M_TEMP, M_NOWAIT)) == NULL) { 1112 free(ifgl, M_TEMP); 1113 IFNET_WUNLOCK(); 1114 return (ENOMEM); 1115 } 1116 1117 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1118 if (!strcmp(ifg->ifg_group, groupname)) 1119 break; 1120 1121 if (ifg == NULL) { 1122 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1123 M_TEMP, M_NOWAIT)) == NULL) { 1124 free(ifgl, M_TEMP); 1125 free(ifgm, M_TEMP); 1126 IFNET_WUNLOCK(); 1127 return (ENOMEM); 1128 } 1129 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1130 ifg->ifg_refcnt = 0; 1131 TAILQ_INIT(&ifg->ifg_members); 1132 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1133 new = 1; 1134 } 1135 1136 ifg->ifg_refcnt++; 1137 ifgl->ifgl_group = ifg; 1138 ifgm->ifgm_ifp = ifp; 1139 1140 IF_ADDR_WLOCK(ifp); 1141 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1142 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1143 IF_ADDR_WUNLOCK(ifp); 1144 1145 IFNET_WUNLOCK(); 1146 1147 if (new) 1148 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1149 EVENTHANDLER_INVOKE(group_change_event, groupname); 1150 1151 return (0); 1152 } 1153 1154 /* 1155 * Remove a group from an interface 1156 */ 1157 int 1158 if_delgroup(struct ifnet *ifp, const char *groupname) 1159 { 1160 struct ifg_list *ifgl; 1161 struct ifg_member *ifgm; 1162 1163 IFNET_WLOCK(); 1164 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1165 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1166 break; 1167 if (ifgl == NULL) { 1168 IFNET_WUNLOCK(); 1169 return (ENOENT); 1170 } 1171 1172 IF_ADDR_WLOCK(ifp); 1173 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1174 IF_ADDR_WUNLOCK(ifp); 1175 1176 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1177 if (ifgm->ifgm_ifp == ifp) 1178 break; 1179 1180 if (ifgm != NULL) { 1181 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1182 free(ifgm, M_TEMP); 1183 } 1184 1185 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1186 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1187 IFNET_WUNLOCK(); 1188 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1189 free(ifgl->ifgl_group, M_TEMP); 1190 } else 1191 IFNET_WUNLOCK(); 1192 1193 free(ifgl, M_TEMP); 1194 1195 EVENTHANDLER_INVOKE(group_change_event, groupname); 1196 1197 return (0); 1198 } 1199 1200 /* 1201 * Remove an interface from all groups 1202 */ 1203 static void 1204 if_delgroups(struct ifnet *ifp) 1205 { 1206 struct ifg_list *ifgl; 1207 struct ifg_member *ifgm; 1208 char groupname[IFNAMSIZ]; 1209 1210 IFNET_WLOCK(); 1211 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1212 ifgl = TAILQ_FIRST(&ifp->if_groups); 1213 1214 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1215 1216 IF_ADDR_WLOCK(ifp); 1217 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1218 IF_ADDR_WUNLOCK(ifp); 1219 1220 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1221 if (ifgm->ifgm_ifp == ifp) 1222 break; 1223 1224 if (ifgm != NULL) { 1225 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1226 ifgm_next); 1227 free(ifgm, M_TEMP); 1228 } 1229 1230 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1231 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1232 IFNET_WUNLOCK(); 1233 EVENTHANDLER_INVOKE(group_detach_event, 1234 ifgl->ifgl_group); 1235 free(ifgl->ifgl_group, M_TEMP); 1236 } else 1237 IFNET_WUNLOCK(); 1238 1239 free(ifgl, M_TEMP); 1240 1241 EVENTHANDLER_INVOKE(group_change_event, groupname); 1242 1243 IFNET_WLOCK(); 1244 } 1245 IFNET_WUNLOCK(); 1246 } 1247 1248 /* 1249 * Stores all groups from an interface in memory pointed 1250 * to by data 1251 */ 1252 static int 1253 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1254 { 1255 int len, error; 1256 struct ifg_list *ifgl; 1257 struct ifg_req ifgrq, *ifgp; 1258 struct ifgroupreq *ifgr = data; 1259 1260 if (ifgr->ifgr_len == 0) { 1261 IF_ADDR_RLOCK(ifp); 1262 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1263 ifgr->ifgr_len += sizeof(struct ifg_req); 1264 IF_ADDR_RUNLOCK(ifp); 1265 return (0); 1266 } 1267 1268 len = ifgr->ifgr_len; 1269 ifgp = ifgr->ifgr_groups; 1270 /* XXX: wire */ 1271 IF_ADDR_RLOCK(ifp); 1272 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1273 if (len < sizeof(ifgrq)) { 1274 IF_ADDR_RUNLOCK(ifp); 1275 return (EINVAL); 1276 } 1277 bzero(&ifgrq, sizeof ifgrq); 1278 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1279 sizeof(ifgrq.ifgrq_group)); 1280 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1281 IF_ADDR_RUNLOCK(ifp); 1282 return (error); 1283 } 1284 len -= sizeof(ifgrq); 1285 ifgp++; 1286 } 1287 IF_ADDR_RUNLOCK(ifp); 1288 1289 return (0); 1290 } 1291 1292 /* 1293 * Stores all members of a group in memory pointed to by data 1294 */ 1295 static int 1296 if_getgroupmembers(struct ifgroupreq *data) 1297 { 1298 struct ifgroupreq *ifgr = data; 1299 struct ifg_group *ifg; 1300 struct ifg_member *ifgm; 1301 struct ifg_req ifgrq, *ifgp; 1302 int len, error; 1303 1304 IFNET_RLOCK(); 1305 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1306 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1307 break; 1308 if (ifg == NULL) { 1309 IFNET_RUNLOCK(); 1310 return (ENOENT); 1311 } 1312 1313 if (ifgr->ifgr_len == 0) { 1314 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1315 ifgr->ifgr_len += sizeof(ifgrq); 1316 IFNET_RUNLOCK(); 1317 return (0); 1318 } 1319 1320 len = ifgr->ifgr_len; 1321 ifgp = ifgr->ifgr_groups; 1322 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1323 if (len < sizeof(ifgrq)) { 1324 IFNET_RUNLOCK(); 1325 return (EINVAL); 1326 } 1327 bzero(&ifgrq, sizeof ifgrq); 1328 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1329 sizeof(ifgrq.ifgrq_member)); 1330 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1331 IFNET_RUNLOCK(); 1332 return (error); 1333 } 1334 len -= sizeof(ifgrq); 1335 ifgp++; 1336 } 1337 IFNET_RUNLOCK(); 1338 1339 return (0); 1340 } 1341 1342 /* 1343 * Delete Routes for a Network Interface 1344 * 1345 * Called for each routing entry via the rnh->rnh_walktree() call above 1346 * to delete all route entries referencing a detaching network interface. 1347 * 1348 * Arguments: 1349 * rn pointer to node in the routing table 1350 * arg argument passed to rnh->rnh_walktree() - detaching interface 1351 * 1352 * Returns: 1353 * 0 successful 1354 * errno failed - reason indicated 1355 * 1356 */ 1357 static int 1358 if_rtdel(struct radix_node *rn, void *arg) 1359 { 1360 struct rtentry *rt = (struct rtentry *)rn; 1361 struct ifnet *ifp = arg; 1362 int err; 1363 1364 if (rt->rt_ifp == ifp) { 1365 1366 /* 1367 * Protect (sorta) against walktree recursion problems 1368 * with cloned routes 1369 */ 1370 if ((rt->rt_flags & RTF_UP) == 0) 1371 return (0); 1372 1373 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1374 rt_mask(rt), 1375 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED, 1376 (struct rtentry **) NULL, rt->rt_fibnum); 1377 if (err) { 1378 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1379 } 1380 } 1381 1382 return (0); 1383 } 1384 1385 /* 1386 * Wrapper functions for struct ifnet address list locking macros. These are 1387 * used by kernel modules to avoid encoding programming interface or binary 1388 * interface assumptions that may be violated when kernel-internal locking 1389 * approaches change. 1390 */ 1391 void 1392 if_addr_rlock(struct ifnet *ifp) 1393 { 1394 1395 IF_ADDR_RLOCK(ifp); 1396 } 1397 1398 void 1399 if_addr_runlock(struct ifnet *ifp) 1400 { 1401 1402 IF_ADDR_RUNLOCK(ifp); 1403 } 1404 1405 void 1406 if_maddr_rlock(struct ifnet *ifp) 1407 { 1408 1409 IF_ADDR_RLOCK(ifp); 1410 } 1411 1412 void 1413 if_maddr_runlock(struct ifnet *ifp) 1414 { 1415 1416 IF_ADDR_RUNLOCK(ifp); 1417 } 1418 1419 /* 1420 * Initialization, destruction and refcounting functions for ifaddrs. 1421 */ 1422 void 1423 ifa_init(struct ifaddr *ifa) 1424 { 1425 1426 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1427 refcount_init(&ifa->ifa_refcnt, 1); 1428 ifa->if_data.ifi_datalen = sizeof(ifa->if_data); 1429 } 1430 1431 void 1432 ifa_ref(struct ifaddr *ifa) 1433 { 1434 1435 refcount_acquire(&ifa->ifa_refcnt); 1436 } 1437 1438 void 1439 ifa_free(struct ifaddr *ifa) 1440 { 1441 1442 if (refcount_release(&ifa->ifa_refcnt)) { 1443 mtx_destroy(&ifa->ifa_mtx); 1444 free(ifa, M_IFADDR); 1445 } 1446 } 1447 1448 int 1449 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1450 { 1451 int error = 0; 1452 struct rtentry *rt = NULL; 1453 struct rt_addrinfo info; 1454 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1455 1456 bzero(&info, sizeof(info)); 1457 info.rti_ifp = V_loif; 1458 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1459 info.rti_info[RTAX_DST] = ia; 1460 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1461 error = rtrequest1_fib(RTM_ADD, &info, &rt, ifa->ifa_ifp->if_fib); 1462 1463 if (error == 0 && rt != NULL) { 1464 RT_LOCK(rt); 1465 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1466 ifa->ifa_ifp->if_type; 1467 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1468 ifa->ifa_ifp->if_index; 1469 RT_REMREF(rt); 1470 RT_UNLOCK(rt); 1471 } else if (error != 0) 1472 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error); 1473 1474 return (error); 1475 } 1476 1477 int 1478 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1479 { 1480 int error = 0; 1481 struct rt_addrinfo info; 1482 struct sockaddr_dl null_sdl; 1483 1484 bzero(&null_sdl, sizeof(null_sdl)); 1485 null_sdl.sdl_len = sizeof(null_sdl); 1486 null_sdl.sdl_family = AF_LINK; 1487 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1488 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1489 bzero(&info, sizeof(info)); 1490 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1491 info.rti_info[RTAX_DST] = ia; 1492 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1493 error = rtrequest1_fib(RTM_DELETE, &info, NULL, ifa->ifa_ifp->if_fib); 1494 1495 if (error != 0) 1496 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error); 1497 1498 return (error); 1499 } 1500 1501 /* 1502 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1503 * structs used to represent other address families, it is necessary 1504 * to perform a different comparison. 1505 */ 1506 1507 #define sa_equal(a1, a2) \ 1508 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1509 1510 #define sa_dl_equal(a1, a2) \ 1511 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1512 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1513 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1514 LLADDR((struct sockaddr_dl *)(a2)), \ 1515 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1516 1517 /* 1518 * Locate an interface based on a complete address. 1519 */ 1520 /*ARGSUSED*/ 1521 static struct ifaddr * 1522 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1523 { 1524 struct ifnet *ifp; 1525 struct ifaddr *ifa; 1526 1527 IFNET_RLOCK_NOSLEEP(); 1528 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1529 IF_ADDR_RLOCK(ifp); 1530 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1531 if (ifa->ifa_addr->sa_family != addr->sa_family) 1532 continue; 1533 if (sa_equal(addr, ifa->ifa_addr)) { 1534 if (getref) 1535 ifa_ref(ifa); 1536 IF_ADDR_RUNLOCK(ifp); 1537 goto done; 1538 } 1539 /* IP6 doesn't have broadcast */ 1540 if ((ifp->if_flags & IFF_BROADCAST) && 1541 ifa->ifa_broadaddr && 1542 ifa->ifa_broadaddr->sa_len != 0 && 1543 sa_equal(ifa->ifa_broadaddr, addr)) { 1544 if (getref) 1545 ifa_ref(ifa); 1546 IF_ADDR_RUNLOCK(ifp); 1547 goto done; 1548 } 1549 } 1550 IF_ADDR_RUNLOCK(ifp); 1551 } 1552 ifa = NULL; 1553 done: 1554 IFNET_RUNLOCK_NOSLEEP(); 1555 return (ifa); 1556 } 1557 1558 struct ifaddr * 1559 ifa_ifwithaddr(struct sockaddr *addr) 1560 { 1561 1562 return (ifa_ifwithaddr_internal(addr, 1)); 1563 } 1564 1565 int 1566 ifa_ifwithaddr_check(struct sockaddr *addr) 1567 { 1568 1569 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1570 } 1571 1572 /* 1573 * Locate an interface based on the broadcast address. 1574 */ 1575 /* ARGSUSED */ 1576 struct ifaddr * 1577 ifa_ifwithbroadaddr(struct sockaddr *addr) 1578 { 1579 struct ifnet *ifp; 1580 struct ifaddr *ifa; 1581 1582 IFNET_RLOCK_NOSLEEP(); 1583 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1584 IF_ADDR_RLOCK(ifp); 1585 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1586 if (ifa->ifa_addr->sa_family != addr->sa_family) 1587 continue; 1588 if ((ifp->if_flags & IFF_BROADCAST) && 1589 ifa->ifa_broadaddr && 1590 ifa->ifa_broadaddr->sa_len != 0 && 1591 sa_equal(ifa->ifa_broadaddr, addr)) { 1592 ifa_ref(ifa); 1593 IF_ADDR_RUNLOCK(ifp); 1594 goto done; 1595 } 1596 } 1597 IF_ADDR_RUNLOCK(ifp); 1598 } 1599 ifa = NULL; 1600 done: 1601 IFNET_RUNLOCK_NOSLEEP(); 1602 return (ifa); 1603 } 1604 1605 /* 1606 * Locate the point to point interface with a given destination address. 1607 */ 1608 /*ARGSUSED*/ 1609 struct ifaddr * 1610 ifa_ifwithdstaddr_fib(struct sockaddr *addr, int fibnum) 1611 { 1612 struct ifnet *ifp; 1613 struct ifaddr *ifa; 1614 1615 IFNET_RLOCK_NOSLEEP(); 1616 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1617 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1618 continue; 1619 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1620 continue; 1621 IF_ADDR_RLOCK(ifp); 1622 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1623 if (ifa->ifa_addr->sa_family != addr->sa_family) 1624 continue; 1625 if (ifa->ifa_dstaddr != NULL && 1626 sa_equal(addr, ifa->ifa_dstaddr)) { 1627 ifa_ref(ifa); 1628 IF_ADDR_RUNLOCK(ifp); 1629 goto done; 1630 } 1631 } 1632 IF_ADDR_RUNLOCK(ifp); 1633 } 1634 ifa = NULL; 1635 done: 1636 IFNET_RUNLOCK_NOSLEEP(); 1637 return (ifa); 1638 } 1639 1640 struct ifaddr * 1641 ifa_ifwithdstaddr(struct sockaddr *addr) 1642 { 1643 1644 return (ifa_ifwithdstaddr_fib(addr, RT_ALL_FIBS)); 1645 } 1646 1647 /* 1648 * Find an interface on a specific network. If many, choice 1649 * is most specific found. 1650 */ 1651 struct ifaddr * 1652 ifa_ifwithnet_fib(struct sockaddr *addr, int ignore_ptp, int fibnum) 1653 { 1654 struct ifnet *ifp; 1655 struct ifaddr *ifa; 1656 struct ifaddr *ifa_maybe = NULL; 1657 u_int af = addr->sa_family; 1658 char *addr_data = addr->sa_data, *cplim; 1659 1660 /* 1661 * AF_LINK addresses can be looked up directly by their index number, 1662 * so do that if we can. 1663 */ 1664 if (af == AF_LINK) { 1665 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1666 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1667 return (ifaddr_byindex(sdl->sdl_index)); 1668 } 1669 1670 /* 1671 * Scan though each interface, looking for ones that have addresses 1672 * in this address family and the requested fib. Maintain a reference 1673 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that 1674 * kept it stable when we move onto the next interface. 1675 */ 1676 IFNET_RLOCK_NOSLEEP(); 1677 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1678 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1679 continue; 1680 IF_ADDR_RLOCK(ifp); 1681 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1682 char *cp, *cp2, *cp3; 1683 1684 if (ifa->ifa_addr->sa_family != af) 1685 next: continue; 1686 if (af == AF_INET && 1687 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1688 /* 1689 * This is a bit broken as it doesn't 1690 * take into account that the remote end may 1691 * be a single node in the network we are 1692 * looking for. 1693 * The trouble is that we don't know the 1694 * netmask for the remote end. 1695 */ 1696 if (ifa->ifa_dstaddr != NULL && 1697 sa_equal(addr, ifa->ifa_dstaddr)) { 1698 ifa_ref(ifa); 1699 IF_ADDR_RUNLOCK(ifp); 1700 goto done; 1701 } 1702 } else { 1703 /* 1704 * if we have a special address handler, 1705 * then use it instead of the generic one. 1706 */ 1707 if (ifa->ifa_claim_addr) { 1708 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1709 ifa_ref(ifa); 1710 IF_ADDR_RUNLOCK(ifp); 1711 goto done; 1712 } 1713 continue; 1714 } 1715 1716 /* 1717 * Scan all the bits in the ifa's address. 1718 * If a bit dissagrees with what we are 1719 * looking for, mask it with the netmask 1720 * to see if it really matters. 1721 * (A byte at a time) 1722 */ 1723 if (ifa->ifa_netmask == 0) 1724 continue; 1725 cp = addr_data; 1726 cp2 = ifa->ifa_addr->sa_data; 1727 cp3 = ifa->ifa_netmask->sa_data; 1728 cplim = ifa->ifa_netmask->sa_len 1729 + (char *)ifa->ifa_netmask; 1730 while (cp3 < cplim) 1731 if ((*cp++ ^ *cp2++) & *cp3++) 1732 goto next; /* next address! */ 1733 /* 1734 * If the netmask of what we just found 1735 * is more specific than what we had before 1736 * (if we had one), or if the virtual status 1737 * of new prefix is better than of the old one, 1738 * then remember the new one before continuing 1739 * to search for an even better one. 1740 */ 1741 if (ifa_maybe == NULL || 1742 ifa_preferred(ifa_maybe, ifa) || 1743 rn_refines((caddr_t)ifa->ifa_netmask, 1744 (caddr_t)ifa_maybe->ifa_netmask)) { 1745 if (ifa_maybe != NULL) 1746 ifa_free(ifa_maybe); 1747 ifa_maybe = ifa; 1748 ifa_ref(ifa_maybe); 1749 } 1750 } 1751 } 1752 IF_ADDR_RUNLOCK(ifp); 1753 } 1754 ifa = ifa_maybe; 1755 ifa_maybe = NULL; 1756 done: 1757 IFNET_RUNLOCK_NOSLEEP(); 1758 if (ifa_maybe != NULL) 1759 ifa_free(ifa_maybe); 1760 return (ifa); 1761 } 1762 1763 struct ifaddr * 1764 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1765 { 1766 1767 return (ifa_ifwithnet_fib(addr, ignore_ptp, RT_ALL_FIBS)); 1768 } 1769 1770 /* 1771 * Find an interface address specific to an interface best matching 1772 * a given address. 1773 */ 1774 struct ifaddr * 1775 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1776 { 1777 struct ifaddr *ifa; 1778 char *cp, *cp2, *cp3; 1779 char *cplim; 1780 struct ifaddr *ifa_maybe = NULL; 1781 u_int af = addr->sa_family; 1782 1783 if (af >= AF_MAX) 1784 return (NULL); 1785 IF_ADDR_RLOCK(ifp); 1786 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1787 if (ifa->ifa_addr->sa_family != af) 1788 continue; 1789 if (ifa_maybe == NULL) 1790 ifa_maybe = ifa; 1791 if (ifa->ifa_netmask == 0) { 1792 if (sa_equal(addr, ifa->ifa_addr) || 1793 (ifa->ifa_dstaddr && 1794 sa_equal(addr, ifa->ifa_dstaddr))) 1795 goto done; 1796 continue; 1797 } 1798 if (ifp->if_flags & IFF_POINTOPOINT) { 1799 if (sa_equal(addr, ifa->ifa_dstaddr)) 1800 goto done; 1801 } else { 1802 cp = addr->sa_data; 1803 cp2 = ifa->ifa_addr->sa_data; 1804 cp3 = ifa->ifa_netmask->sa_data; 1805 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1806 for (; cp3 < cplim; cp3++) 1807 if ((*cp++ ^ *cp2++) & *cp3) 1808 break; 1809 if (cp3 == cplim) 1810 goto done; 1811 } 1812 } 1813 ifa = ifa_maybe; 1814 done: 1815 if (ifa != NULL) 1816 ifa_ref(ifa); 1817 IF_ADDR_RUNLOCK(ifp); 1818 return (ifa); 1819 } 1820 1821 /* 1822 * See whether new ifa is better than current one: 1823 * 1) A non-virtual one is preferred over virtual. 1824 * 2) A virtual in master state preferred over any other state. 1825 * 1826 * Used in several address selecting functions. 1827 */ 1828 int 1829 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 1830 { 1831 1832 return (cur->ifa_carp && (!next->ifa_carp || 1833 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 1834 } 1835 1836 #include <net/if_llatbl.h> 1837 1838 /* 1839 * Default action when installing a route with a Link Level gateway. 1840 * Lookup an appropriate real ifa to point to. 1841 * This should be moved to /sys/net/link.c eventually. 1842 */ 1843 static void 1844 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1845 { 1846 struct ifaddr *ifa, *oifa; 1847 struct sockaddr *dst; 1848 struct ifnet *ifp; 1849 1850 RT_LOCK_ASSERT(rt); 1851 1852 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1853 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1854 return; 1855 ifa = ifaof_ifpforaddr(dst, ifp); 1856 if (ifa) { 1857 oifa = rt->rt_ifa; 1858 rt->rt_ifa = ifa; 1859 ifa_free(oifa); 1860 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1861 ifa->ifa_rtrequest(cmd, rt, info); 1862 } 1863 } 1864 1865 /* 1866 * Mark an interface down and notify protocols of 1867 * the transition. 1868 */ 1869 static void 1870 if_unroute(struct ifnet *ifp, int flag, int fam) 1871 { 1872 struct ifaddr *ifa; 1873 1874 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1875 1876 ifp->if_flags &= ~flag; 1877 getmicrotime(&ifp->if_lastchange); 1878 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1879 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1880 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1881 ifp->if_qflush(ifp); 1882 1883 if (ifp->if_carp) 1884 (*carp_linkstate_p)(ifp); 1885 rt_ifmsg(ifp); 1886 } 1887 1888 /* 1889 * Mark an interface up and notify protocols of 1890 * the transition. 1891 */ 1892 static void 1893 if_route(struct ifnet *ifp, int flag, int fam) 1894 { 1895 struct ifaddr *ifa; 1896 1897 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1898 1899 ifp->if_flags |= flag; 1900 getmicrotime(&ifp->if_lastchange); 1901 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1902 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1903 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1904 if (ifp->if_carp) 1905 (*carp_linkstate_p)(ifp); 1906 rt_ifmsg(ifp); 1907 #ifdef INET6 1908 in6_if_up(ifp); 1909 #endif 1910 } 1911 1912 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1913 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1914 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1915 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1916 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1917 int (*vlan_setcookie_p)(struct ifnet *, void *); 1918 void *(*vlan_cookie_p)(struct ifnet *); 1919 1920 /* 1921 * Handle a change in the interface link state. To avoid LORs 1922 * between driver lock and upper layer locks, as well as possible 1923 * recursions, we post event to taskqueue, and all job 1924 * is done in static do_link_state_change(). 1925 */ 1926 void 1927 if_link_state_change(struct ifnet *ifp, int link_state) 1928 { 1929 /* Return if state hasn't changed. */ 1930 if (ifp->if_link_state == link_state) 1931 return; 1932 1933 ifp->if_link_state = link_state; 1934 1935 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1936 } 1937 1938 static void 1939 do_link_state_change(void *arg, int pending) 1940 { 1941 struct ifnet *ifp = (struct ifnet *)arg; 1942 int link_state = ifp->if_link_state; 1943 CURVNET_SET(ifp->if_vnet); 1944 1945 /* Notify that the link state has changed. */ 1946 rt_ifmsg(ifp); 1947 if (ifp->if_vlantrunk != NULL) 1948 (*vlan_link_state_p)(ifp); 1949 1950 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1951 IFP2AC(ifp)->ac_netgraph != NULL) 1952 (*ng_ether_link_state_p)(ifp, link_state); 1953 if (ifp->if_carp) 1954 (*carp_linkstate_p)(ifp); 1955 if (ifp->if_bridge) 1956 (*bridge_linkstate_p)(ifp); 1957 if (ifp->if_lagg) 1958 (*lagg_linkstate_p)(ifp, link_state); 1959 1960 if (IS_DEFAULT_VNET(curvnet)) 1961 devctl_notify("IFNET", ifp->if_xname, 1962 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1963 NULL); 1964 if (pending > 1) 1965 if_printf(ifp, "%d link states coalesced\n", pending); 1966 if (log_link_state_change) 1967 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1968 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1969 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 1970 CURVNET_RESTORE(); 1971 } 1972 1973 /* 1974 * Mark an interface down and notify protocols of 1975 * the transition. 1976 */ 1977 void 1978 if_down(struct ifnet *ifp) 1979 { 1980 1981 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1982 } 1983 1984 /* 1985 * Mark an interface up and notify protocols of 1986 * the transition. 1987 */ 1988 void 1989 if_up(struct ifnet *ifp) 1990 { 1991 1992 if_route(ifp, IFF_UP, AF_UNSPEC); 1993 } 1994 1995 /* 1996 * Flush an interface queue. 1997 */ 1998 void 1999 if_qflush(struct ifnet *ifp) 2000 { 2001 struct mbuf *m, *n; 2002 struct ifaltq *ifq; 2003 2004 ifq = &ifp->if_snd; 2005 IFQ_LOCK(ifq); 2006 #ifdef ALTQ 2007 if (ALTQ_IS_ENABLED(ifq)) 2008 ALTQ_PURGE(ifq); 2009 #endif 2010 n = ifq->ifq_head; 2011 while ((m = n) != 0) { 2012 n = m->m_nextpkt; 2013 m_freem(m); 2014 } 2015 ifq->ifq_head = 0; 2016 ifq->ifq_tail = 0; 2017 ifq->ifq_len = 0; 2018 IFQ_UNLOCK(ifq); 2019 } 2020 2021 /* 2022 * Map interface name to interface structure pointer, with or without 2023 * returning a reference. 2024 */ 2025 struct ifnet * 2026 ifunit_ref(const char *name) 2027 { 2028 struct ifnet *ifp; 2029 2030 IFNET_RLOCK_NOSLEEP(); 2031 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2032 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2033 !(ifp->if_flags & IFF_DYING)) 2034 break; 2035 } 2036 if (ifp != NULL) 2037 if_ref(ifp); 2038 IFNET_RUNLOCK_NOSLEEP(); 2039 return (ifp); 2040 } 2041 2042 struct ifnet * 2043 ifunit(const char *name) 2044 { 2045 struct ifnet *ifp; 2046 2047 IFNET_RLOCK_NOSLEEP(); 2048 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2049 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2050 break; 2051 } 2052 IFNET_RUNLOCK_NOSLEEP(); 2053 return (ifp); 2054 } 2055 2056 /* 2057 * Hardware specific interface ioctls. 2058 */ 2059 static int 2060 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2061 { 2062 struct ifreq *ifr; 2063 struct ifstat *ifs; 2064 int error = 0; 2065 int new_flags, temp_flags; 2066 size_t namelen, onamelen; 2067 size_t descrlen; 2068 char *descrbuf, *odescrbuf; 2069 char new_name[IFNAMSIZ]; 2070 struct ifaddr *ifa; 2071 struct sockaddr_dl *sdl; 2072 2073 ifr = (struct ifreq *)data; 2074 switch (cmd) { 2075 case SIOCGIFINDEX: 2076 ifr->ifr_index = ifp->if_index; 2077 break; 2078 2079 case SIOCGIFFLAGS: 2080 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2081 ifr->ifr_flags = temp_flags & 0xffff; 2082 ifr->ifr_flagshigh = temp_flags >> 16; 2083 break; 2084 2085 case SIOCGIFCAP: 2086 ifr->ifr_reqcap = ifp->if_capabilities; 2087 ifr->ifr_curcap = ifp->if_capenable; 2088 break; 2089 2090 #ifdef MAC 2091 case SIOCGIFMAC: 2092 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2093 break; 2094 #endif 2095 2096 case SIOCGIFMETRIC: 2097 ifr->ifr_metric = ifp->if_metric; 2098 break; 2099 2100 case SIOCGIFMTU: 2101 ifr->ifr_mtu = ifp->if_mtu; 2102 break; 2103 2104 case SIOCGIFPHYS: 2105 ifr->ifr_phys = ifp->if_physical; 2106 break; 2107 2108 case SIOCGIFDESCR: 2109 error = 0; 2110 sx_slock(&ifdescr_sx); 2111 if (ifp->if_description == NULL) 2112 error = ENOMSG; 2113 else { 2114 /* space for terminating nul */ 2115 descrlen = strlen(ifp->if_description) + 1; 2116 if (ifr->ifr_buffer.length < descrlen) 2117 ifr->ifr_buffer.buffer = NULL; 2118 else 2119 error = copyout(ifp->if_description, 2120 ifr->ifr_buffer.buffer, descrlen); 2121 ifr->ifr_buffer.length = descrlen; 2122 } 2123 sx_sunlock(&ifdescr_sx); 2124 break; 2125 2126 case SIOCSIFDESCR: 2127 error = priv_check(td, PRIV_NET_SETIFDESCR); 2128 if (error) 2129 return (error); 2130 2131 /* 2132 * Copy only (length-1) bytes to make sure that 2133 * if_description is always nul terminated. The 2134 * length parameter is supposed to count the 2135 * terminating nul in. 2136 */ 2137 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2138 return (ENAMETOOLONG); 2139 else if (ifr->ifr_buffer.length == 0) 2140 descrbuf = NULL; 2141 else { 2142 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2143 M_WAITOK | M_ZERO); 2144 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2145 ifr->ifr_buffer.length - 1); 2146 if (error) { 2147 free(descrbuf, M_IFDESCR); 2148 break; 2149 } 2150 } 2151 2152 sx_xlock(&ifdescr_sx); 2153 odescrbuf = ifp->if_description; 2154 ifp->if_description = descrbuf; 2155 sx_xunlock(&ifdescr_sx); 2156 2157 getmicrotime(&ifp->if_lastchange); 2158 free(odescrbuf, M_IFDESCR); 2159 break; 2160 2161 case SIOCGIFFIB: 2162 ifr->ifr_fib = ifp->if_fib; 2163 break; 2164 2165 case SIOCSIFFIB: 2166 error = priv_check(td, PRIV_NET_SETIFFIB); 2167 if (error) 2168 return (error); 2169 if (ifr->ifr_fib >= rt_numfibs) 2170 return (EINVAL); 2171 2172 ifp->if_fib = ifr->ifr_fib; 2173 break; 2174 2175 case SIOCSIFFLAGS: 2176 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2177 if (error) 2178 return (error); 2179 /* 2180 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2181 * check, so we don't need special handling here yet. 2182 */ 2183 new_flags = (ifr->ifr_flags & 0xffff) | 2184 (ifr->ifr_flagshigh << 16); 2185 if (ifp->if_flags & IFF_SMART) { 2186 /* Smart drivers twiddle their own routes */ 2187 } else if (ifp->if_flags & IFF_UP && 2188 (new_flags & IFF_UP) == 0) { 2189 if_down(ifp); 2190 } else if (new_flags & IFF_UP && 2191 (ifp->if_flags & IFF_UP) == 0) { 2192 if_up(ifp); 2193 } 2194 /* See if permanently promiscuous mode bit is about to flip */ 2195 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2196 if (new_flags & IFF_PPROMISC) 2197 ifp->if_flags |= IFF_PROMISC; 2198 else if (ifp->if_pcount == 0) 2199 ifp->if_flags &= ~IFF_PROMISC; 2200 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2201 ifp->if_xname, 2202 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2203 } 2204 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2205 (new_flags &~ IFF_CANTCHANGE); 2206 if (ifp->if_ioctl) { 2207 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2208 } 2209 getmicrotime(&ifp->if_lastchange); 2210 break; 2211 2212 case SIOCSIFCAP: 2213 error = priv_check(td, PRIV_NET_SETIFCAP); 2214 if (error) 2215 return (error); 2216 if (ifp->if_ioctl == NULL) 2217 return (EOPNOTSUPP); 2218 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2219 return (EINVAL); 2220 error = (*ifp->if_ioctl)(ifp, cmd, data); 2221 if (error == 0) 2222 getmicrotime(&ifp->if_lastchange); 2223 break; 2224 2225 #ifdef MAC 2226 case SIOCSIFMAC: 2227 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2228 break; 2229 #endif 2230 2231 case SIOCSIFNAME: 2232 error = priv_check(td, PRIV_NET_SETIFNAME); 2233 if (error) 2234 return (error); 2235 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2236 if (error != 0) 2237 return (error); 2238 if (new_name[0] == '\0') 2239 return (EINVAL); 2240 if (ifunit(new_name) != NULL) 2241 return (EEXIST); 2242 2243 /* 2244 * XXX: Locking. Nothing else seems to lock if_flags, 2245 * and there are numerous other races with the 2246 * ifunit() checks not being atomic with namespace 2247 * changes (renames, vmoves, if_attach, etc). 2248 */ 2249 ifp->if_flags |= IFF_RENAMING; 2250 2251 /* Announce the departure of the interface. */ 2252 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2253 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2254 2255 log(LOG_INFO, "%s: changing name to '%s'\n", 2256 ifp->if_xname, new_name); 2257 2258 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2259 ifa = ifp->if_addr; 2260 IFA_LOCK(ifa); 2261 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2262 namelen = strlen(new_name); 2263 onamelen = sdl->sdl_nlen; 2264 /* 2265 * Move the address if needed. This is safe because we 2266 * allocate space for a name of length IFNAMSIZ when we 2267 * create this in if_attach(). 2268 */ 2269 if (namelen != onamelen) { 2270 bcopy(sdl->sdl_data + onamelen, 2271 sdl->sdl_data + namelen, sdl->sdl_alen); 2272 } 2273 bcopy(new_name, sdl->sdl_data, namelen); 2274 sdl->sdl_nlen = namelen; 2275 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2276 bzero(sdl->sdl_data, onamelen); 2277 while (namelen != 0) 2278 sdl->sdl_data[--namelen] = 0xff; 2279 IFA_UNLOCK(ifa); 2280 2281 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2282 /* Announce the return of the interface. */ 2283 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2284 2285 ifp->if_flags &= ~IFF_RENAMING; 2286 break; 2287 2288 #ifdef VIMAGE 2289 case SIOCSIFVNET: 2290 error = priv_check(td, PRIV_NET_SETIFVNET); 2291 if (error) 2292 return (error); 2293 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2294 break; 2295 #endif 2296 2297 case SIOCSIFMETRIC: 2298 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2299 if (error) 2300 return (error); 2301 ifp->if_metric = ifr->ifr_metric; 2302 getmicrotime(&ifp->if_lastchange); 2303 break; 2304 2305 case SIOCSIFPHYS: 2306 error = priv_check(td, PRIV_NET_SETIFPHYS); 2307 if (error) 2308 return (error); 2309 if (ifp->if_ioctl == NULL) 2310 return (EOPNOTSUPP); 2311 error = (*ifp->if_ioctl)(ifp, cmd, data); 2312 if (error == 0) 2313 getmicrotime(&ifp->if_lastchange); 2314 break; 2315 2316 case SIOCSIFMTU: 2317 { 2318 u_long oldmtu = ifp->if_mtu; 2319 2320 error = priv_check(td, PRIV_NET_SETIFMTU); 2321 if (error) 2322 return (error); 2323 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2324 return (EINVAL); 2325 if (ifp->if_ioctl == NULL) 2326 return (EOPNOTSUPP); 2327 error = (*ifp->if_ioctl)(ifp, cmd, data); 2328 if (error == 0) { 2329 getmicrotime(&ifp->if_lastchange); 2330 rt_ifmsg(ifp); 2331 } 2332 /* 2333 * If the link MTU changed, do network layer specific procedure. 2334 */ 2335 if (ifp->if_mtu != oldmtu) { 2336 #ifdef INET6 2337 nd6_setmtu(ifp); 2338 #endif 2339 } 2340 break; 2341 } 2342 2343 case SIOCADDMULTI: 2344 case SIOCDELMULTI: 2345 if (cmd == SIOCADDMULTI) 2346 error = priv_check(td, PRIV_NET_ADDMULTI); 2347 else 2348 error = priv_check(td, PRIV_NET_DELMULTI); 2349 if (error) 2350 return (error); 2351 2352 /* Don't allow group membership on non-multicast interfaces. */ 2353 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2354 return (EOPNOTSUPP); 2355 2356 /* Don't let users screw up protocols' entries. */ 2357 if (ifr->ifr_addr.sa_family != AF_LINK) 2358 return (EINVAL); 2359 2360 if (cmd == SIOCADDMULTI) { 2361 struct ifmultiaddr *ifma; 2362 2363 /* 2364 * Userland is only permitted to join groups once 2365 * via the if_addmulti() KPI, because it cannot hold 2366 * struct ifmultiaddr * between calls. It may also 2367 * lose a race while we check if the membership 2368 * already exists. 2369 */ 2370 IF_ADDR_RLOCK(ifp); 2371 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2372 IF_ADDR_RUNLOCK(ifp); 2373 if (ifma != NULL) 2374 error = EADDRINUSE; 2375 else 2376 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2377 } else { 2378 error = if_delmulti(ifp, &ifr->ifr_addr); 2379 } 2380 if (error == 0) 2381 getmicrotime(&ifp->if_lastchange); 2382 break; 2383 2384 case SIOCSIFPHYADDR: 2385 case SIOCDIFPHYADDR: 2386 #ifdef INET6 2387 case SIOCSIFPHYADDR_IN6: 2388 #endif 2389 case SIOCSLIFPHYADDR: 2390 case SIOCSIFMEDIA: 2391 case SIOCSIFGENERIC: 2392 error = priv_check(td, PRIV_NET_HWIOCTL); 2393 if (error) 2394 return (error); 2395 if (ifp->if_ioctl == NULL) 2396 return (EOPNOTSUPP); 2397 error = (*ifp->if_ioctl)(ifp, cmd, data); 2398 if (error == 0) 2399 getmicrotime(&ifp->if_lastchange); 2400 break; 2401 2402 case SIOCGIFSTATUS: 2403 ifs = (struct ifstat *)data; 2404 ifs->ascii[0] = '\0'; 2405 2406 case SIOCGIFPSRCADDR: 2407 case SIOCGIFPDSTADDR: 2408 case SIOCGLIFPHYADDR: 2409 case SIOCGIFMEDIA: 2410 case SIOCGIFGENERIC: 2411 if (ifp->if_ioctl == NULL) 2412 return (EOPNOTSUPP); 2413 error = (*ifp->if_ioctl)(ifp, cmd, data); 2414 break; 2415 2416 case SIOCSIFLLADDR: 2417 error = priv_check(td, PRIV_NET_SETLLADDR); 2418 if (error) 2419 return (error); 2420 error = if_setlladdr(ifp, 2421 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2422 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2423 break; 2424 2425 case SIOCAIFGROUP: 2426 { 2427 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2428 2429 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2430 if (error) 2431 return (error); 2432 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2433 return (error); 2434 break; 2435 } 2436 2437 case SIOCGIFGROUP: 2438 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2439 return (error); 2440 break; 2441 2442 case SIOCDIFGROUP: 2443 { 2444 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2445 2446 error = priv_check(td, PRIV_NET_DELIFGROUP); 2447 if (error) 2448 return (error); 2449 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2450 return (error); 2451 break; 2452 } 2453 2454 default: 2455 error = ENOIOCTL; 2456 break; 2457 } 2458 return (error); 2459 } 2460 2461 #ifdef COMPAT_FREEBSD32 2462 struct ifconf32 { 2463 int32_t ifc_len; 2464 union { 2465 uint32_t ifcu_buf; 2466 uint32_t ifcu_req; 2467 } ifc_ifcu; 2468 }; 2469 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2470 #endif 2471 2472 /* 2473 * Interface ioctls. 2474 */ 2475 int 2476 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2477 { 2478 struct ifnet *ifp; 2479 struct ifreq *ifr; 2480 int error; 2481 int oif_flags; 2482 2483 CURVNET_SET(so->so_vnet); 2484 switch (cmd) { 2485 case SIOCGIFCONF: 2486 case OSIOCGIFCONF: 2487 error = ifconf(cmd, data); 2488 CURVNET_RESTORE(); 2489 return (error); 2490 2491 #ifdef COMPAT_FREEBSD32 2492 case SIOCGIFCONF32: 2493 { 2494 struct ifconf32 *ifc32; 2495 struct ifconf ifc; 2496 2497 ifc32 = (struct ifconf32 *)data; 2498 ifc.ifc_len = ifc32->ifc_len; 2499 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2500 2501 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2502 CURVNET_RESTORE(); 2503 if (error == 0) 2504 ifc32->ifc_len = ifc.ifc_len; 2505 return (error); 2506 } 2507 #endif 2508 } 2509 ifr = (struct ifreq *)data; 2510 2511 switch (cmd) { 2512 #ifdef VIMAGE 2513 case SIOCSIFRVNET: 2514 error = priv_check(td, PRIV_NET_SETIFVNET); 2515 if (error == 0) 2516 error = if_vmove_reclaim(td, ifr->ifr_name, 2517 ifr->ifr_jid); 2518 CURVNET_RESTORE(); 2519 return (error); 2520 #endif 2521 case SIOCIFCREATE: 2522 case SIOCIFCREATE2: 2523 error = priv_check(td, PRIV_NET_IFCREATE); 2524 if (error == 0) 2525 error = if_clone_create(ifr->ifr_name, 2526 sizeof(ifr->ifr_name), 2527 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2528 CURVNET_RESTORE(); 2529 return (error); 2530 case SIOCIFDESTROY: 2531 error = priv_check(td, PRIV_NET_IFDESTROY); 2532 if (error == 0) 2533 error = if_clone_destroy(ifr->ifr_name); 2534 CURVNET_RESTORE(); 2535 return (error); 2536 2537 case SIOCIFGCLONERS: 2538 error = if_clone_list((struct if_clonereq *)data); 2539 CURVNET_RESTORE(); 2540 return (error); 2541 case SIOCGIFGMEMB: 2542 error = if_getgroupmembers((struct ifgroupreq *)data); 2543 CURVNET_RESTORE(); 2544 return (error); 2545 #if defined(INET) || defined(INET6) 2546 case SIOCSVH: 2547 case SIOCGVH: 2548 if (carp_ioctl_p == NULL) 2549 error = EPROTONOSUPPORT; 2550 else 2551 error = (*carp_ioctl_p)(ifr, cmd, td); 2552 CURVNET_RESTORE(); 2553 return (error); 2554 #endif 2555 } 2556 2557 ifp = ifunit_ref(ifr->ifr_name); 2558 if (ifp == NULL) { 2559 CURVNET_RESTORE(); 2560 return (ENXIO); 2561 } 2562 2563 error = ifhwioctl(cmd, ifp, data, td); 2564 if (error != ENOIOCTL) { 2565 if_rele(ifp); 2566 CURVNET_RESTORE(); 2567 return (error); 2568 } 2569 2570 oif_flags = ifp->if_flags; 2571 if (so->so_proto == NULL) { 2572 if_rele(ifp); 2573 CURVNET_RESTORE(); 2574 return (EOPNOTSUPP); 2575 } 2576 2577 /* 2578 * Pass the request on to the socket control method, and if the 2579 * latter returns EOPNOTSUPP, directly to the interface. 2580 * 2581 * Make an exception for the legacy SIOCSIF* requests. Drivers 2582 * trust SIOCSIFADDR et al to come from an already privileged 2583 * layer, and do not perform any credentials checks or input 2584 * validation. 2585 */ 2586 #ifndef COMPAT_43 2587 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2588 data, 2589 ifp, td)); 2590 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 2591 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 2592 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 2593 error = (*ifp->if_ioctl)(ifp, cmd, data); 2594 #else 2595 { 2596 u_long ocmd = cmd; 2597 2598 switch (cmd) { 2599 2600 case SIOCSIFDSTADDR: 2601 case SIOCSIFADDR: 2602 case SIOCSIFBRDADDR: 2603 case SIOCSIFNETMASK: 2604 #if BYTE_ORDER != BIG_ENDIAN 2605 if (ifr->ifr_addr.sa_family == 0 && 2606 ifr->ifr_addr.sa_len < 16) { 2607 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2608 ifr->ifr_addr.sa_len = 16; 2609 } 2610 #else 2611 if (ifr->ifr_addr.sa_len == 0) 2612 ifr->ifr_addr.sa_len = 16; 2613 #endif 2614 break; 2615 2616 case OSIOCGIFADDR: 2617 cmd = SIOCGIFADDR; 2618 break; 2619 2620 case OSIOCGIFDSTADDR: 2621 cmd = SIOCGIFDSTADDR; 2622 break; 2623 2624 case OSIOCGIFBRDADDR: 2625 cmd = SIOCGIFBRDADDR; 2626 break; 2627 2628 case OSIOCGIFNETMASK: 2629 cmd = SIOCGIFNETMASK; 2630 } 2631 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2632 cmd, 2633 data, 2634 ifp, td)); 2635 if (error == EOPNOTSUPP && ifp != NULL && 2636 ifp->if_ioctl != NULL && 2637 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 2638 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 2639 error = (*ifp->if_ioctl)(ifp, cmd, data); 2640 switch (ocmd) { 2641 2642 case OSIOCGIFADDR: 2643 case OSIOCGIFDSTADDR: 2644 case OSIOCGIFBRDADDR: 2645 case OSIOCGIFNETMASK: 2646 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2647 2648 } 2649 } 2650 #endif /* COMPAT_43 */ 2651 2652 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2653 #ifdef INET6 2654 if (ifp->if_flags & IFF_UP) 2655 in6_if_up(ifp); 2656 #endif 2657 } 2658 if_rele(ifp); 2659 CURVNET_RESTORE(); 2660 return (error); 2661 } 2662 2663 /* 2664 * The code common to handling reference counted flags, 2665 * e.g., in ifpromisc() and if_allmulti(). 2666 * The "pflag" argument can specify a permanent mode flag to check, 2667 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2668 * 2669 * Only to be used on stack-owned flags, not driver-owned flags. 2670 */ 2671 static int 2672 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2673 { 2674 struct ifreq ifr; 2675 int error; 2676 int oldflags, oldcount; 2677 2678 /* Sanity checks to catch programming errors */ 2679 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2680 ("%s: setting driver-owned flag %d", __func__, flag)); 2681 2682 if (onswitch) 2683 KASSERT(*refcount >= 0, 2684 ("%s: increment negative refcount %d for flag %d", 2685 __func__, *refcount, flag)); 2686 else 2687 KASSERT(*refcount > 0, 2688 ("%s: decrement non-positive refcount %d for flag %d", 2689 __func__, *refcount, flag)); 2690 2691 /* In case this mode is permanent, just touch refcount */ 2692 if (ifp->if_flags & pflag) { 2693 *refcount += onswitch ? 1 : -1; 2694 return (0); 2695 } 2696 2697 /* Save ifnet parameters for if_ioctl() may fail */ 2698 oldcount = *refcount; 2699 oldflags = ifp->if_flags; 2700 2701 /* 2702 * See if we aren't the only and touching refcount is enough. 2703 * Actually toggle interface flag if we are the first or last. 2704 */ 2705 if (onswitch) { 2706 if ((*refcount)++) 2707 return (0); 2708 ifp->if_flags |= flag; 2709 } else { 2710 if (--(*refcount)) 2711 return (0); 2712 ifp->if_flags &= ~flag; 2713 } 2714 2715 /* Call down the driver since we've changed interface flags */ 2716 if (ifp->if_ioctl == NULL) { 2717 error = EOPNOTSUPP; 2718 goto recover; 2719 } 2720 ifr.ifr_flags = ifp->if_flags & 0xffff; 2721 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2722 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2723 if (error) 2724 goto recover; 2725 /* Notify userland that interface flags have changed */ 2726 rt_ifmsg(ifp); 2727 return (0); 2728 2729 recover: 2730 /* Recover after driver error */ 2731 *refcount = oldcount; 2732 ifp->if_flags = oldflags; 2733 return (error); 2734 } 2735 2736 /* 2737 * Set/clear promiscuous mode on interface ifp based on the truth value 2738 * of pswitch. The calls are reference counted so that only the first 2739 * "on" request actually has an effect, as does the final "off" request. 2740 * Results are undefined if the "off" and "on" requests are not matched. 2741 */ 2742 int 2743 ifpromisc(struct ifnet *ifp, int pswitch) 2744 { 2745 int error; 2746 int oldflags = ifp->if_flags; 2747 2748 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2749 &ifp->if_pcount, pswitch); 2750 /* If promiscuous mode status has changed, log a message */ 2751 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2752 log(LOG_INFO, "%s: promiscuous mode %s\n", 2753 ifp->if_xname, 2754 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2755 return (error); 2756 } 2757 2758 /* 2759 * Return interface configuration 2760 * of system. List may be used 2761 * in later ioctl's (above) to get 2762 * other information. 2763 */ 2764 /*ARGSUSED*/ 2765 static int 2766 ifconf(u_long cmd, caddr_t data) 2767 { 2768 struct ifconf *ifc = (struct ifconf *)data; 2769 struct ifnet *ifp; 2770 struct ifaddr *ifa; 2771 struct ifreq ifr; 2772 struct sbuf *sb; 2773 int error, full = 0, valid_len, max_len; 2774 2775 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2776 max_len = MAXPHYS - 1; 2777 2778 /* Prevent hostile input from being able to crash the system */ 2779 if (ifc->ifc_len <= 0) 2780 return (EINVAL); 2781 2782 again: 2783 if (ifc->ifc_len <= max_len) { 2784 max_len = ifc->ifc_len; 2785 full = 1; 2786 } 2787 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2788 max_len = 0; 2789 valid_len = 0; 2790 2791 IFNET_RLOCK(); 2792 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2793 int addrs; 2794 2795 /* 2796 * Zero the ifr_name buffer to make sure we don't 2797 * disclose the contents of the stack. 2798 */ 2799 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2800 2801 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2802 >= sizeof(ifr.ifr_name)) { 2803 sbuf_delete(sb); 2804 IFNET_RUNLOCK(); 2805 return (ENAMETOOLONG); 2806 } 2807 2808 addrs = 0; 2809 IF_ADDR_RLOCK(ifp); 2810 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2811 struct sockaddr *sa = ifa->ifa_addr; 2812 2813 if (prison_if(curthread->td_ucred, sa) != 0) 2814 continue; 2815 addrs++; 2816 #ifdef COMPAT_43 2817 if (cmd == OSIOCGIFCONF) { 2818 struct osockaddr *osa = 2819 (struct osockaddr *)&ifr.ifr_addr; 2820 ifr.ifr_addr = *sa; 2821 osa->sa_family = sa->sa_family; 2822 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2823 max_len += sizeof(ifr); 2824 } else 2825 #endif 2826 if (sa->sa_len <= sizeof(*sa)) { 2827 ifr.ifr_addr = *sa; 2828 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2829 max_len += sizeof(ifr); 2830 } else { 2831 sbuf_bcat(sb, &ifr, 2832 offsetof(struct ifreq, ifr_addr)); 2833 max_len += offsetof(struct ifreq, ifr_addr); 2834 sbuf_bcat(sb, sa, sa->sa_len); 2835 max_len += sa->sa_len; 2836 } 2837 2838 if (sbuf_error(sb) == 0) 2839 valid_len = sbuf_len(sb); 2840 } 2841 IF_ADDR_RUNLOCK(ifp); 2842 if (addrs == 0) { 2843 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2844 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2845 max_len += sizeof(ifr); 2846 2847 if (sbuf_error(sb) == 0) 2848 valid_len = sbuf_len(sb); 2849 } 2850 } 2851 IFNET_RUNLOCK(); 2852 2853 /* 2854 * If we didn't allocate enough space (uncommon), try again. If 2855 * we have already allocated as much space as we are allowed, 2856 * return what we've got. 2857 */ 2858 if (valid_len != max_len && !full) { 2859 sbuf_delete(sb); 2860 goto again; 2861 } 2862 2863 ifc->ifc_len = valid_len; 2864 sbuf_finish(sb); 2865 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2866 sbuf_delete(sb); 2867 return (error); 2868 } 2869 2870 /* 2871 * Just like ifpromisc(), but for all-multicast-reception mode. 2872 */ 2873 int 2874 if_allmulti(struct ifnet *ifp, int onswitch) 2875 { 2876 2877 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2878 } 2879 2880 struct ifmultiaddr * 2881 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2882 { 2883 struct ifmultiaddr *ifma; 2884 2885 IF_ADDR_LOCK_ASSERT(ifp); 2886 2887 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2888 if (sa->sa_family == AF_LINK) { 2889 if (sa_dl_equal(ifma->ifma_addr, sa)) 2890 break; 2891 } else { 2892 if (sa_equal(ifma->ifma_addr, sa)) 2893 break; 2894 } 2895 } 2896 2897 return ifma; 2898 } 2899 2900 /* 2901 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2902 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2903 * the ifnet multicast address list here, so the caller must do that and 2904 * other setup work (such as notifying the device driver). The reference 2905 * count is initialized to 1. 2906 */ 2907 static struct ifmultiaddr * 2908 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2909 int mflags) 2910 { 2911 struct ifmultiaddr *ifma; 2912 struct sockaddr *dupsa; 2913 2914 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2915 M_ZERO); 2916 if (ifma == NULL) 2917 return (NULL); 2918 2919 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2920 if (dupsa == NULL) { 2921 free(ifma, M_IFMADDR); 2922 return (NULL); 2923 } 2924 bcopy(sa, dupsa, sa->sa_len); 2925 ifma->ifma_addr = dupsa; 2926 2927 ifma->ifma_ifp = ifp; 2928 ifma->ifma_refcount = 1; 2929 ifma->ifma_protospec = NULL; 2930 2931 if (llsa == NULL) { 2932 ifma->ifma_lladdr = NULL; 2933 return (ifma); 2934 } 2935 2936 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2937 if (dupsa == NULL) { 2938 free(ifma->ifma_addr, M_IFMADDR); 2939 free(ifma, M_IFMADDR); 2940 return (NULL); 2941 } 2942 bcopy(llsa, dupsa, llsa->sa_len); 2943 ifma->ifma_lladdr = dupsa; 2944 2945 return (ifma); 2946 } 2947 2948 /* 2949 * if_freemulti: free ifmultiaddr structure and possibly attached related 2950 * addresses. The caller is responsible for implementing reference 2951 * counting, notifying the driver, handling routing messages, and releasing 2952 * any dependent link layer state. 2953 */ 2954 static void 2955 if_freemulti(struct ifmultiaddr *ifma) 2956 { 2957 2958 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2959 ifma->ifma_refcount)); 2960 KASSERT(ifma->ifma_protospec == NULL, 2961 ("if_freemulti: protospec not NULL")); 2962 2963 if (ifma->ifma_lladdr != NULL) 2964 free(ifma->ifma_lladdr, M_IFMADDR); 2965 free(ifma->ifma_addr, M_IFMADDR); 2966 free(ifma, M_IFMADDR); 2967 } 2968 2969 /* 2970 * Register an additional multicast address with a network interface. 2971 * 2972 * - If the address is already present, bump the reference count on the 2973 * address and return. 2974 * - If the address is not link-layer, look up a link layer address. 2975 * - Allocate address structures for one or both addresses, and attach to the 2976 * multicast address list on the interface. If automatically adding a link 2977 * layer address, the protocol address will own a reference to the link 2978 * layer address, to be freed when it is freed. 2979 * - Notify the network device driver of an addition to the multicast address 2980 * list. 2981 * 2982 * 'sa' points to caller-owned memory with the desired multicast address. 2983 * 2984 * 'retifma' will be used to return a pointer to the resulting multicast 2985 * address reference, if desired. 2986 */ 2987 int 2988 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2989 struct ifmultiaddr **retifma) 2990 { 2991 struct ifmultiaddr *ifma, *ll_ifma; 2992 struct sockaddr *llsa; 2993 int error; 2994 2995 /* 2996 * If the address is already present, return a new reference to it; 2997 * otherwise, allocate storage and set up a new address. 2998 */ 2999 IF_ADDR_WLOCK(ifp); 3000 ifma = if_findmulti(ifp, sa); 3001 if (ifma != NULL) { 3002 ifma->ifma_refcount++; 3003 if (retifma != NULL) 3004 *retifma = ifma; 3005 IF_ADDR_WUNLOCK(ifp); 3006 return (0); 3007 } 3008 3009 /* 3010 * The address isn't already present; resolve the protocol address 3011 * into a link layer address, and then look that up, bump its 3012 * refcount or allocate an ifma for that also. If 'llsa' was 3013 * returned, we will need to free it later. 3014 */ 3015 llsa = NULL; 3016 ll_ifma = NULL; 3017 if (ifp->if_resolvemulti != NULL) { 3018 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3019 if (error) 3020 goto unlock_out; 3021 } 3022 3023 /* 3024 * Allocate the new address. Don't hook it up yet, as we may also 3025 * need to allocate a link layer multicast address. 3026 */ 3027 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3028 if (ifma == NULL) { 3029 error = ENOMEM; 3030 goto free_llsa_out; 3031 } 3032 3033 /* 3034 * If a link layer address is found, we'll need to see if it's 3035 * already present in the address list, or allocate is as well. 3036 * When this block finishes, the link layer address will be on the 3037 * list. 3038 */ 3039 if (llsa != NULL) { 3040 ll_ifma = if_findmulti(ifp, llsa); 3041 if (ll_ifma == NULL) { 3042 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3043 if (ll_ifma == NULL) { 3044 --ifma->ifma_refcount; 3045 if_freemulti(ifma); 3046 error = ENOMEM; 3047 goto free_llsa_out; 3048 } 3049 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3050 ifma_link); 3051 } else 3052 ll_ifma->ifma_refcount++; 3053 ifma->ifma_llifma = ll_ifma; 3054 } 3055 3056 /* 3057 * We now have a new multicast address, ifma, and possibly a new or 3058 * referenced link layer address. Add the primary address to the 3059 * ifnet address list. 3060 */ 3061 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3062 3063 if (retifma != NULL) 3064 *retifma = ifma; 3065 3066 /* 3067 * Must generate the message while holding the lock so that 'ifma' 3068 * pointer is still valid. 3069 */ 3070 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3071 IF_ADDR_WUNLOCK(ifp); 3072 3073 /* 3074 * We are certain we have added something, so call down to the 3075 * interface to let them know about it. 3076 */ 3077 if (ifp->if_ioctl != NULL) { 3078 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3079 } 3080 3081 if (llsa != NULL) 3082 free(llsa, M_IFMADDR); 3083 3084 return (0); 3085 3086 free_llsa_out: 3087 if (llsa != NULL) 3088 free(llsa, M_IFMADDR); 3089 3090 unlock_out: 3091 IF_ADDR_WUNLOCK(ifp); 3092 return (error); 3093 } 3094 3095 /* 3096 * Delete a multicast group membership by network-layer group address. 3097 * 3098 * Returns ENOENT if the entry could not be found. If ifp no longer 3099 * exists, results are undefined. This entry point should only be used 3100 * from subsystems which do appropriate locking to hold ifp for the 3101 * duration of the call. 3102 * Network-layer protocol domains must use if_delmulti_ifma(). 3103 */ 3104 int 3105 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3106 { 3107 struct ifmultiaddr *ifma; 3108 int lastref; 3109 #ifdef INVARIANTS 3110 struct ifnet *oifp; 3111 3112 IFNET_RLOCK_NOSLEEP(); 3113 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3114 if (ifp == oifp) 3115 break; 3116 if (ifp != oifp) 3117 ifp = NULL; 3118 IFNET_RUNLOCK_NOSLEEP(); 3119 3120 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3121 #endif 3122 if (ifp == NULL) 3123 return (ENOENT); 3124 3125 IF_ADDR_WLOCK(ifp); 3126 lastref = 0; 3127 ifma = if_findmulti(ifp, sa); 3128 if (ifma != NULL) 3129 lastref = if_delmulti_locked(ifp, ifma, 0); 3130 IF_ADDR_WUNLOCK(ifp); 3131 3132 if (ifma == NULL) 3133 return (ENOENT); 3134 3135 if (lastref && ifp->if_ioctl != NULL) { 3136 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3137 } 3138 3139 return (0); 3140 } 3141 3142 /* 3143 * Delete all multicast group membership for an interface. 3144 * Should be used to quickly flush all multicast filters. 3145 */ 3146 void 3147 if_delallmulti(struct ifnet *ifp) 3148 { 3149 struct ifmultiaddr *ifma; 3150 struct ifmultiaddr *next; 3151 3152 IF_ADDR_WLOCK(ifp); 3153 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3154 if_delmulti_locked(ifp, ifma, 0); 3155 IF_ADDR_WUNLOCK(ifp); 3156 } 3157 3158 /* 3159 * Delete a multicast group membership by group membership pointer. 3160 * Network-layer protocol domains must use this routine. 3161 * 3162 * It is safe to call this routine if the ifp disappeared. 3163 */ 3164 void 3165 if_delmulti_ifma(struct ifmultiaddr *ifma) 3166 { 3167 struct ifnet *ifp; 3168 int lastref; 3169 3170 ifp = ifma->ifma_ifp; 3171 #ifdef DIAGNOSTIC 3172 if (ifp == NULL) { 3173 printf("%s: ifma_ifp seems to be detached\n", __func__); 3174 } else { 3175 struct ifnet *oifp; 3176 3177 IFNET_RLOCK_NOSLEEP(); 3178 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3179 if (ifp == oifp) 3180 break; 3181 if (ifp != oifp) { 3182 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3183 ifp = NULL; 3184 } 3185 IFNET_RUNLOCK_NOSLEEP(); 3186 } 3187 #endif 3188 /* 3189 * If and only if the ifnet instance exists: Acquire the address lock. 3190 */ 3191 if (ifp != NULL) 3192 IF_ADDR_WLOCK(ifp); 3193 3194 lastref = if_delmulti_locked(ifp, ifma, 0); 3195 3196 if (ifp != NULL) { 3197 /* 3198 * If and only if the ifnet instance exists: 3199 * Release the address lock. 3200 * If the group was left: update the hardware hash filter. 3201 */ 3202 IF_ADDR_WUNLOCK(ifp); 3203 if (lastref && ifp->if_ioctl != NULL) { 3204 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3205 } 3206 } 3207 } 3208 3209 /* 3210 * Perform deletion of network-layer and/or link-layer multicast address. 3211 * 3212 * Return 0 if the reference count was decremented. 3213 * Return 1 if the final reference was released, indicating that the 3214 * hardware hash filter should be reprogrammed. 3215 */ 3216 static int 3217 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3218 { 3219 struct ifmultiaddr *ll_ifma; 3220 3221 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3222 KASSERT(ifma->ifma_ifp == ifp, 3223 ("%s: inconsistent ifp %p", __func__, ifp)); 3224 IF_ADDR_WLOCK_ASSERT(ifp); 3225 } 3226 3227 ifp = ifma->ifma_ifp; 3228 3229 /* 3230 * If the ifnet is detaching, null out references to ifnet, 3231 * so that upper protocol layers will notice, and not attempt 3232 * to obtain locks for an ifnet which no longer exists. The 3233 * routing socket announcement must happen before the ifnet 3234 * instance is detached from the system. 3235 */ 3236 if (detaching) { 3237 #ifdef DIAGNOSTIC 3238 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3239 #endif 3240 /* 3241 * ifp may already be nulled out if we are being reentered 3242 * to delete the ll_ifma. 3243 */ 3244 if (ifp != NULL) { 3245 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3246 ifma->ifma_ifp = NULL; 3247 } 3248 } 3249 3250 if (--ifma->ifma_refcount > 0) 3251 return 0; 3252 3253 /* 3254 * If this ifma is a network-layer ifma, a link-layer ifma may 3255 * have been associated with it. Release it first if so. 3256 */ 3257 ll_ifma = ifma->ifma_llifma; 3258 if (ll_ifma != NULL) { 3259 KASSERT(ifma->ifma_lladdr != NULL, 3260 ("%s: llifma w/o lladdr", __func__)); 3261 if (detaching) 3262 ll_ifma->ifma_ifp = NULL; /* XXX */ 3263 if (--ll_ifma->ifma_refcount == 0) { 3264 if (ifp != NULL) { 3265 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3266 ifma_link); 3267 } 3268 if_freemulti(ll_ifma); 3269 } 3270 } 3271 3272 if (ifp != NULL) 3273 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3274 3275 if_freemulti(ifma); 3276 3277 /* 3278 * The last reference to this instance of struct ifmultiaddr 3279 * was released; the hardware should be notified of this change. 3280 */ 3281 return 1; 3282 } 3283 3284 /* 3285 * Set the link layer address on an interface. 3286 * 3287 * At this time we only support certain types of interfaces, 3288 * and we don't allow the length of the address to change. 3289 */ 3290 int 3291 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3292 { 3293 struct sockaddr_dl *sdl; 3294 struct ifaddr *ifa; 3295 struct ifreq ifr; 3296 3297 IF_ADDR_RLOCK(ifp); 3298 ifa = ifp->if_addr; 3299 if (ifa == NULL) { 3300 IF_ADDR_RUNLOCK(ifp); 3301 return (EINVAL); 3302 } 3303 ifa_ref(ifa); 3304 IF_ADDR_RUNLOCK(ifp); 3305 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3306 if (sdl == NULL) { 3307 ifa_free(ifa); 3308 return (EINVAL); 3309 } 3310 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3311 ifa_free(ifa); 3312 return (EINVAL); 3313 } 3314 switch (ifp->if_type) { 3315 case IFT_ETHER: 3316 case IFT_FDDI: 3317 case IFT_XETHER: 3318 case IFT_ISO88025: 3319 case IFT_L2VLAN: 3320 case IFT_BRIDGE: 3321 case IFT_ARCNET: 3322 case IFT_IEEE8023ADLAG: 3323 case IFT_IEEE80211: 3324 bcopy(lladdr, LLADDR(sdl), len); 3325 ifa_free(ifa); 3326 break; 3327 default: 3328 ifa_free(ifa); 3329 return (ENODEV); 3330 } 3331 3332 /* 3333 * If the interface is already up, we need 3334 * to re-init it in order to reprogram its 3335 * address filter. 3336 */ 3337 if ((ifp->if_flags & IFF_UP) != 0) { 3338 if (ifp->if_ioctl) { 3339 ifp->if_flags &= ~IFF_UP; 3340 ifr.ifr_flags = ifp->if_flags & 0xffff; 3341 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3342 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3343 ifp->if_flags |= IFF_UP; 3344 ifr.ifr_flags = ifp->if_flags & 0xffff; 3345 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3346 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3347 } 3348 #ifdef INET 3349 /* 3350 * Also send gratuitous ARPs to notify other nodes about 3351 * the address change. 3352 */ 3353 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3354 if (ifa->ifa_addr->sa_family == AF_INET) 3355 arp_ifinit(ifp, ifa); 3356 } 3357 #endif 3358 } 3359 return (0); 3360 } 3361 3362 /* 3363 * The name argument must be a pointer to storage which will last as 3364 * long as the interface does. For physical devices, the result of 3365 * device_get_name(dev) is a good choice and for pseudo-devices a 3366 * static string works well. 3367 */ 3368 void 3369 if_initname(struct ifnet *ifp, const char *name, int unit) 3370 { 3371 ifp->if_dname = name; 3372 ifp->if_dunit = unit; 3373 if (unit != IF_DUNIT_NONE) 3374 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3375 else 3376 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3377 } 3378 3379 int 3380 if_printf(struct ifnet *ifp, const char * fmt, ...) 3381 { 3382 va_list ap; 3383 int retval; 3384 3385 retval = printf("%s: ", ifp->if_xname); 3386 va_start(ap, fmt); 3387 retval += vprintf(fmt, ap); 3388 va_end(ap); 3389 return (retval); 3390 } 3391 3392 void 3393 if_start(struct ifnet *ifp) 3394 { 3395 3396 (*(ifp)->if_start)(ifp); 3397 } 3398 3399 /* 3400 * Backwards compatibility interface for drivers 3401 * that have not implemented it 3402 */ 3403 static int 3404 if_transmit(struct ifnet *ifp, struct mbuf *m) 3405 { 3406 int error; 3407 3408 IFQ_HANDOFF(ifp, m, error); 3409 return (error); 3410 } 3411 3412 int 3413 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3414 { 3415 int active = 0; 3416 3417 IF_LOCK(ifq); 3418 if (_IF_QFULL(ifq)) { 3419 _IF_DROP(ifq); 3420 IF_UNLOCK(ifq); 3421 m_freem(m); 3422 return (0); 3423 } 3424 if (ifp != NULL) { 3425 ifp->if_obytes += m->m_pkthdr.len + adjust; 3426 if (m->m_flags & (M_BCAST|M_MCAST)) 3427 ifp->if_omcasts++; 3428 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3429 } 3430 _IF_ENQUEUE(ifq, m); 3431 IF_UNLOCK(ifq); 3432 if (ifp != NULL && !active) 3433 (*(ifp)->if_start)(ifp); 3434 return (1); 3435 } 3436 3437 void 3438 if_register_com_alloc(u_char type, 3439 if_com_alloc_t *a, if_com_free_t *f) 3440 { 3441 3442 KASSERT(if_com_alloc[type] == NULL, 3443 ("if_register_com_alloc: %d already registered", type)); 3444 KASSERT(if_com_free[type] == NULL, 3445 ("if_register_com_alloc: %d free already registered", type)); 3446 3447 if_com_alloc[type] = a; 3448 if_com_free[type] = f; 3449 } 3450 3451 void 3452 if_deregister_com_alloc(u_char type) 3453 { 3454 3455 KASSERT(if_com_alloc[type] != NULL, 3456 ("if_deregister_com_alloc: %d not registered", type)); 3457 KASSERT(if_com_free[type] != NULL, 3458 ("if_deregister_com_alloc: %d free not registered", type)); 3459 if_com_alloc[type] = NULL; 3460 if_com_free[type] = NULL; 3461 }
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