1 /*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD$ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 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 >= V_if_indexlim) { 288 if_grow(); 289 goto retry; 290 } 291 if (idx > V_if_index) 292 V_if_index = idx; 293 *idxp = idx; 294 return (0); 295 } 296 297 static void 298 ifindex_free_locked(u_short idx) 299 { 300 301 IFNET_WLOCK_ASSERT(); 302 303 V_ifindex_table[idx].ife_ifnet = NULL; 304 while (V_if_index > 0 && 305 V_ifindex_table[V_if_index].ife_ifnet == NULL) 306 V_if_index--; 307 } 308 309 static void 310 ifindex_free(u_short idx) 311 { 312 313 IFNET_WLOCK(); 314 ifindex_free_locked(idx); 315 IFNET_WUNLOCK(); 316 } 317 318 static void 319 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 320 { 321 322 IFNET_WLOCK_ASSERT(); 323 324 V_ifindex_table[idx].ife_ifnet = ifp; 325 } 326 327 static void 328 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 329 { 330 331 IFNET_WLOCK(); 332 ifnet_setbyindex_locked(idx, ifp); 333 IFNET_WUNLOCK(); 334 } 335 336 struct ifaddr * 337 ifaddr_byindex(u_short idx) 338 { 339 struct ifaddr *ifa; 340 341 IFNET_RLOCK_NOSLEEP(); 342 ifa = ifnet_byindex_locked(idx)->if_addr; 343 if (ifa != NULL) 344 ifa_ref(ifa); 345 IFNET_RUNLOCK_NOSLEEP(); 346 return (ifa); 347 } 348 349 /* 350 * Network interface utility routines. 351 * 352 * Routines with ifa_ifwith* names take sockaddr *'s as 353 * parameters. 354 */ 355 356 static void 357 vnet_if_init(const void *unused __unused) 358 { 359 360 TAILQ_INIT(&V_ifnet); 361 TAILQ_INIT(&V_ifg_head); 362 IFNET_WLOCK(); 363 if_grow(); /* create initial table */ 364 IFNET_WUNLOCK(); 365 vnet_if_clone_init(); 366 } 367 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 368 NULL); 369 370 /* ARGSUSED*/ 371 static void 372 if_init(void *dummy __unused) 373 { 374 375 IFNET_LOCK_INIT(); 376 if_clone_init(); 377 } 378 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 379 380 381 #ifdef VIMAGE 382 static void 383 vnet_if_uninit(const void *unused __unused) 384 { 385 386 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 387 "not empty", __func__, __LINE__, &V_ifnet)); 388 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 389 "not empty", __func__, __LINE__, &V_ifg_head)); 390 391 free((caddr_t)V_ifindex_table, M_IFNET); 392 } 393 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 394 vnet_if_uninit, NULL); 395 #endif 396 397 static void 398 if_grow(void) 399 { 400 int oldlim; 401 u_int n; 402 struct ifindex_entry *e; 403 404 IFNET_WLOCK_ASSERT(); 405 oldlim = V_if_indexlim; 406 IFNET_WUNLOCK(); 407 n = (oldlim << 1) * sizeof(*e); 408 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 409 IFNET_WLOCK(); 410 if (V_if_indexlim != oldlim) { 411 free(e, M_IFNET); 412 return; 413 } 414 if (V_ifindex_table != NULL) { 415 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 416 free((caddr_t)V_ifindex_table, M_IFNET); 417 } 418 V_if_indexlim <<= 1; 419 V_ifindex_table = e; 420 } 421 422 /* 423 * Allocate a struct ifnet and an index for an interface. A layer 2 424 * common structure will also be allocated if an allocation routine is 425 * registered for the passed type. 426 */ 427 struct ifnet * 428 if_alloc(u_char type) 429 { 430 struct ifnet *ifp; 431 u_short idx; 432 433 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 434 IFNET_WLOCK(); 435 if (ifindex_alloc_locked(&idx) != 0) { 436 IFNET_WUNLOCK(); 437 free(ifp, M_IFNET); 438 return (NULL); 439 } 440 ifnet_setbyindex_locked(idx, IFNET_HOLD); 441 IFNET_WUNLOCK(); 442 ifp->if_index = idx; 443 ifp->if_type = type; 444 ifp->if_alloctype = type; 445 if (if_com_alloc[type] != NULL) { 446 ifp->if_l2com = if_com_alloc[type](type, ifp); 447 if (ifp->if_l2com == NULL) { 448 free(ifp, M_IFNET); 449 ifindex_free(idx); 450 return (NULL); 451 } 452 } 453 454 IF_ADDR_LOCK_INIT(ifp); 455 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 456 ifp->if_afdata_initialized = 0; 457 IF_AFDATA_LOCK_INIT(ifp); 458 TAILQ_INIT(&ifp->if_addrhead); 459 TAILQ_INIT(&ifp->if_multiaddrs); 460 TAILQ_INIT(&ifp->if_groups); 461 #ifdef MAC 462 mac_ifnet_init(ifp); 463 #endif 464 ifq_init(&ifp->if_snd, ifp); 465 466 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 467 ifnet_setbyindex(ifp->if_index, ifp); 468 return (ifp); 469 } 470 471 /* 472 * Do the actual work of freeing a struct ifnet, and layer 2 common 473 * structure. This call is made when the last reference to an 474 * interface is released. 475 */ 476 static void 477 if_free_internal(struct ifnet *ifp) 478 { 479 480 KASSERT((ifp->if_flags & IFF_DYING), 481 ("if_free_internal: interface not dying")); 482 483 if (if_com_free[ifp->if_alloctype] != NULL) 484 if_com_free[ifp->if_alloctype](ifp->if_l2com, 485 ifp->if_alloctype); 486 487 #ifdef MAC 488 mac_ifnet_destroy(ifp); 489 #endif /* MAC */ 490 if (ifp->if_description != NULL) 491 free(ifp->if_description, M_IFDESCR); 492 IF_AFDATA_DESTROY(ifp); 493 IF_ADDR_LOCK_DESTROY(ifp); 494 ifq_delete(&ifp->if_snd); 495 free(ifp, M_IFNET); 496 } 497 498 /* 499 * Deregister an interface and free the associated storage. 500 */ 501 void 502 if_free(struct ifnet *ifp) 503 { 504 505 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 506 507 CURVNET_SET_QUIET(ifp->if_vnet); 508 IFNET_WLOCK(); 509 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 510 ("%s: freeing unallocated ifnet", ifp->if_xname)); 511 512 ifindex_free_locked(ifp->if_index); 513 IFNET_WUNLOCK(); 514 515 if (refcount_release(&ifp->if_refcount)) 516 if_free_internal(ifp); 517 CURVNET_RESTORE(); 518 } 519 520 /* 521 * Interfaces to keep an ifnet type-stable despite the possibility of the 522 * driver calling if_free(). If there are additional references, we defer 523 * freeing the underlying data structure. 524 */ 525 void 526 if_ref(struct ifnet *ifp) 527 { 528 529 /* We don't assert the ifnet list lock here, but arguably should. */ 530 refcount_acquire(&ifp->if_refcount); 531 } 532 533 void 534 if_rele(struct ifnet *ifp) 535 { 536 537 if (!refcount_release(&ifp->if_refcount)) 538 return; 539 if_free_internal(ifp); 540 } 541 542 void 543 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 544 { 545 546 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 547 548 if (ifq->ifq_maxlen == 0) 549 ifq->ifq_maxlen = ifqmaxlen; 550 551 ifq->altq_type = 0; 552 ifq->altq_disc = NULL; 553 ifq->altq_flags &= ALTQF_CANTCHANGE; 554 ifq->altq_tbr = NULL; 555 ifq->altq_ifp = ifp; 556 } 557 558 void 559 ifq_delete(struct ifaltq *ifq) 560 { 561 mtx_destroy(&ifq->ifq_mtx); 562 } 563 564 /* 565 * Perform generic interface initalization tasks and attach the interface 566 * to the list of "active" interfaces. If vmove flag is set on entry 567 * to if_attach_internal(), perform only a limited subset of initialization 568 * tasks, given that we are moving from one vnet to another an ifnet which 569 * has already been fully initialized. 570 * 571 * XXX: 572 * - The decision to return void and thus require this function to 573 * succeed is questionable. 574 * - We should probably do more sanity checking. For instance we don't 575 * do anything to insure if_xname is unique or non-empty. 576 */ 577 void 578 if_attach(struct ifnet *ifp) 579 { 580 581 if_attach_internal(ifp, 0); 582 } 583 584 static void 585 if_attach_internal(struct ifnet *ifp, int vmove) 586 { 587 unsigned socksize, ifasize; 588 int namelen, masklen; 589 struct sockaddr_dl *sdl; 590 struct ifaddr *ifa; 591 592 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 593 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 594 ifp->if_xname); 595 596 #ifdef VIMAGE 597 ifp->if_vnet = curvnet; 598 if (ifp->if_home_vnet == NULL) 599 ifp->if_home_vnet = curvnet; 600 #endif 601 602 if_addgroup(ifp, IFG_ALL); 603 604 getmicrotime(&ifp->if_lastchange); 605 ifp->if_data.ifi_epoch = time_uptime; 606 ifp->if_data.ifi_datalen = sizeof(struct if_data); 607 608 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 609 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 610 ("transmit and qflush must both either be set or both be NULL")); 611 if (ifp->if_transmit == NULL) { 612 ifp->if_transmit = if_transmit; 613 ifp->if_qflush = if_qflush; 614 } 615 616 if (!vmove) { 617 #ifdef MAC 618 mac_ifnet_create(ifp); 619 #endif 620 621 /* 622 * Create a Link Level name for this device. 623 */ 624 namelen = strlen(ifp->if_xname); 625 /* 626 * Always save enough space for any possiable name so we 627 * can do a rename in place later. 628 */ 629 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 630 socksize = masklen + ifp->if_addrlen; 631 if (socksize < sizeof(*sdl)) 632 socksize = sizeof(*sdl); 633 socksize = roundup2(socksize, sizeof(long)); 634 ifasize = sizeof(*ifa) + 2 * socksize; 635 ifa = ifa_alloc(ifasize, M_WAITOK); 636 sdl = (struct sockaddr_dl *)(ifa + 1); 637 sdl->sdl_len = socksize; 638 sdl->sdl_family = AF_LINK; 639 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 640 sdl->sdl_nlen = namelen; 641 sdl->sdl_index = ifp->if_index; 642 sdl->sdl_type = ifp->if_type; 643 ifp->if_addr = ifa; 644 ifa->ifa_ifp = ifp; 645 ifa->ifa_rtrequest = link_rtrequest; 646 ifa->ifa_addr = (struct sockaddr *)sdl; 647 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 648 ifa->ifa_netmask = (struct sockaddr *)sdl; 649 sdl->sdl_len = masklen; 650 while (namelen != 0) 651 sdl->sdl_data[--namelen] = 0xff; 652 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 653 /* Reliably crash if used uninitialized. */ 654 ifp->if_broadcastaddr = NULL; 655 656 #if defined(INET) || defined(INET6) 657 /* Initialize to max value. */ 658 if (ifp->if_hw_tsomax == 0) 659 ifp->if_hw_tsomax = min(IP_MAXPACKET, 32 * MCLBYTES - 660 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 661 KASSERT(ifp->if_hw_tsomax <= IP_MAXPACKET && 662 ifp->if_hw_tsomax >= IP_MAXPACKET / 8, 663 ("%s: tsomax outside of range", __func__)); 664 #endif 665 } 666 #ifdef VIMAGE 667 else { 668 /* 669 * Update the interface index in the link layer address 670 * of the interface. 671 */ 672 for (ifa = ifp->if_addr; ifa != NULL; 673 ifa = TAILQ_NEXT(ifa, ifa_link)) { 674 if (ifa->ifa_addr->sa_family == AF_LINK) { 675 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 676 sdl->sdl_index = ifp->if_index; 677 } 678 } 679 } 680 #endif 681 682 IFNET_WLOCK(); 683 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 684 #ifdef VIMAGE 685 curvnet->vnet_ifcnt++; 686 #endif 687 IFNET_WUNLOCK(); 688 689 if (domain_init_status >= 2) 690 if_attachdomain1(ifp); 691 692 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 693 if (IS_DEFAULT_VNET(curvnet)) 694 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 695 696 /* Announce the interface. */ 697 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 698 } 699 700 static void 701 if_attachdomain(void *dummy) 702 { 703 struct ifnet *ifp; 704 705 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 706 if_attachdomain1(ifp); 707 } 708 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 709 if_attachdomain, NULL); 710 711 static void 712 if_attachdomain1(struct ifnet *ifp) 713 { 714 struct domain *dp; 715 716 /* 717 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 718 * cannot lock ifp->if_afdata initialization, entirely. 719 */ 720 if (IF_AFDATA_TRYLOCK(ifp) == 0) 721 return; 722 if (ifp->if_afdata_initialized >= domain_init_status) { 723 IF_AFDATA_UNLOCK(ifp); 724 log(LOG_WARNING, "%s called more than once on %s\n", 725 __func__, ifp->if_xname); 726 return; 727 } 728 ifp->if_afdata_initialized = domain_init_status; 729 IF_AFDATA_UNLOCK(ifp); 730 731 /* address family dependent data region */ 732 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 733 for (dp = domains; dp; dp = dp->dom_next) { 734 if (dp->dom_ifattach) 735 ifp->if_afdata[dp->dom_family] = 736 (*dp->dom_ifattach)(ifp); 737 } 738 } 739 740 /* 741 * Remove any unicast or broadcast network addresses from an interface. 742 */ 743 void 744 if_purgeaddrs(struct ifnet *ifp) 745 { 746 struct ifaddr *ifa, *next; 747 748 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 749 if (ifa->ifa_addr->sa_family == AF_LINK) 750 continue; 751 #ifdef INET 752 /* XXX: Ugly!! ad hoc just for INET */ 753 if (ifa->ifa_addr->sa_family == AF_INET) { 754 struct ifaliasreq ifr; 755 756 bzero(&ifr, sizeof(ifr)); 757 ifr.ifra_addr = *ifa->ifa_addr; 758 if (ifa->ifa_dstaddr) 759 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 760 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 761 NULL) == 0) 762 continue; 763 } 764 #endif /* INET */ 765 #ifdef INET6 766 if (ifa->ifa_addr->sa_family == AF_INET6) { 767 in6_purgeaddr(ifa); 768 /* ifp_addrhead is already updated */ 769 continue; 770 } 771 #endif /* INET6 */ 772 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 773 ifa_free(ifa); 774 } 775 } 776 777 /* 778 * Remove any multicast network addresses from an interface when an ifnet 779 * is going away. 780 */ 781 static void 782 if_purgemaddrs(struct ifnet *ifp) 783 { 784 struct ifmultiaddr *ifma; 785 struct ifmultiaddr *next; 786 787 IF_ADDR_WLOCK(ifp); 788 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 789 if_delmulti_locked(ifp, ifma, 1); 790 IF_ADDR_WUNLOCK(ifp); 791 } 792 793 /* 794 * Detach an interface, removing it from the list of "active" interfaces. 795 * If vmove flag is set on entry to if_detach_internal(), perform only a 796 * limited subset of cleanup tasks, given that we are moving an ifnet from 797 * one vnet to another, where it must be fully operational. 798 * 799 * XXXRW: There are some significant questions about event ordering, and 800 * how to prevent things from starting to use the interface during detach. 801 */ 802 void 803 if_detach(struct ifnet *ifp) 804 { 805 806 CURVNET_SET_QUIET(ifp->if_vnet); 807 if_detach_internal(ifp, 0); 808 CURVNET_RESTORE(); 809 } 810 811 static void 812 if_detach_internal(struct ifnet *ifp, int vmove) 813 { 814 struct ifaddr *ifa; 815 struct radix_node_head *rnh; 816 int i, j; 817 struct domain *dp; 818 struct ifnet *iter; 819 int found = 0; 820 821 IFNET_WLOCK(); 822 TAILQ_FOREACH(iter, &V_ifnet, if_link) 823 if (iter == ifp) { 824 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 825 found = 1; 826 break; 827 } 828 #ifdef VIMAGE 829 if (found) 830 curvnet->vnet_ifcnt--; 831 #endif 832 IFNET_WUNLOCK(); 833 if (!found) { 834 if (vmove) 835 panic("%s: ifp=%p not on the ifnet tailq %p", 836 __func__, ifp, &V_ifnet); 837 else 838 return; /* XXX this should panic as well? */ 839 } 840 841 /* 842 * Remove/wait for pending events. 843 */ 844 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 845 846 /* 847 * Remove routes and flush queues. 848 */ 849 if_down(ifp); 850 #ifdef ALTQ 851 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 852 altq_disable(&ifp->if_snd); 853 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 854 altq_detach(&ifp->if_snd); 855 #endif 856 857 if_purgeaddrs(ifp); 858 859 #ifdef INET 860 in_ifdetach(ifp); 861 #endif 862 863 #ifdef INET6 864 /* 865 * Remove all IPv6 kernel structs related to ifp. This should be done 866 * before removing routing entries below, since IPv6 interface direct 867 * routes are expected to be removed by the IPv6-specific kernel API. 868 * Otherwise, the kernel will detect some inconsistency and bark it. 869 */ 870 in6_ifdetach(ifp); 871 #endif 872 if_purgemaddrs(ifp); 873 874 if (!vmove) { 875 /* 876 * Prevent further calls into the device driver via ifnet. 877 */ 878 if_dead(ifp); 879 880 /* 881 * Remove link ifaddr pointer and maybe decrement if_index. 882 * Clean up all addresses. 883 */ 884 ifp->if_addr = NULL; 885 886 /* We can now free link ifaddr. */ 887 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 888 ifa = TAILQ_FIRST(&ifp->if_addrhead); 889 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 890 ifa_free(ifa); 891 } 892 } 893 894 /* 895 * Delete all remaining routes using this interface 896 * Unfortuneatly the only way to do this is to slog through 897 * the entire routing table looking for routes which point 898 * to this interface...oh well... 899 */ 900 for (i = 1; i <= AF_MAX; i++) { 901 for (j = 0; j < rt_numfibs; j++) { 902 rnh = rt_tables_get_rnh(j, i); 903 if (rnh == NULL) 904 continue; 905 RADIX_NODE_HEAD_LOCK(rnh); 906 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 907 RADIX_NODE_HEAD_UNLOCK(rnh); 908 } 909 } 910 911 /* Announce that the interface is gone. */ 912 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 913 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 914 if (IS_DEFAULT_VNET(curvnet)) 915 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 916 if_delgroups(ifp); 917 918 /* 919 * We cannot hold the lock over dom_ifdetach calls as they might 920 * sleep, for example trying to drain a callout, thus open up the 921 * theoretical race with re-attaching. 922 */ 923 IF_AFDATA_LOCK(ifp); 924 i = ifp->if_afdata_initialized; 925 ifp->if_afdata_initialized = 0; 926 IF_AFDATA_UNLOCK(ifp); 927 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 928 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 929 (*dp->dom_ifdetach)(ifp, 930 ifp->if_afdata[dp->dom_family]); 931 } 932 } 933 934 #ifdef VIMAGE 935 /* 936 * if_vmove() performs a limited version of if_detach() in current 937 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 938 * An attempt is made to shrink if_index in current vnet, find an 939 * unused if_index in target vnet and calls if_grow() if necessary, 940 * and finally find an unused if_xname for the target vnet. 941 */ 942 void 943 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 944 { 945 u_short idx; 946 947 /* 948 * Detach from current vnet, but preserve LLADDR info, do not 949 * mark as dead etc. so that the ifnet can be reattached later. 950 */ 951 if_detach_internal(ifp, 1); 952 953 /* 954 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 955 * the if_index for that vnet if possible. 956 * 957 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 958 * or we'd lock on one vnet and unlock on another. 959 */ 960 IFNET_WLOCK(); 961 ifindex_free_locked(ifp->if_index); 962 IFNET_WUNLOCK(); 963 964 /* 965 * Perform interface-specific reassignment tasks, if provided by 966 * the driver. 967 */ 968 if (ifp->if_reassign != NULL) 969 ifp->if_reassign(ifp, new_vnet, NULL); 970 971 /* 972 * Switch to the context of the target vnet. 973 */ 974 CURVNET_SET_QUIET(new_vnet); 975 976 IFNET_WLOCK(); 977 if (ifindex_alloc_locked(&idx) != 0) { 978 IFNET_WUNLOCK(); 979 panic("if_index overflow"); 980 } 981 ifp->if_index = idx; 982 ifnet_setbyindex_locked(ifp->if_index, ifp); 983 IFNET_WUNLOCK(); 984 985 if_attach_internal(ifp, 1); 986 987 CURVNET_RESTORE(); 988 } 989 990 /* 991 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 992 */ 993 static int 994 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 995 { 996 struct prison *pr; 997 struct ifnet *difp; 998 999 /* Try to find the prison within our visibility. */ 1000 sx_slock(&allprison_lock); 1001 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1002 sx_sunlock(&allprison_lock); 1003 if (pr == NULL) 1004 return (ENXIO); 1005 prison_hold_locked(pr); 1006 mtx_unlock(&pr->pr_mtx); 1007 1008 /* Do not try to move the iface from and to the same prison. */ 1009 if (pr->pr_vnet == ifp->if_vnet) { 1010 prison_free(pr); 1011 return (EEXIST); 1012 } 1013 1014 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1015 /* XXX Lock interfaces to avoid races. */ 1016 CURVNET_SET_QUIET(pr->pr_vnet); 1017 difp = ifunit(ifname); 1018 CURVNET_RESTORE(); 1019 if (difp != NULL) { 1020 prison_free(pr); 1021 return (EEXIST); 1022 } 1023 1024 /* Move the interface into the child jail/vnet. */ 1025 if_vmove(ifp, pr->pr_vnet); 1026 1027 /* Report the new if_xname back to the userland. */ 1028 sprintf(ifname, "%s", ifp->if_xname); 1029 1030 prison_free(pr); 1031 return (0); 1032 } 1033 1034 static int 1035 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1036 { 1037 struct prison *pr; 1038 struct vnet *vnet_dst; 1039 struct ifnet *ifp; 1040 1041 /* Try to find the prison within our visibility. */ 1042 sx_slock(&allprison_lock); 1043 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1044 sx_sunlock(&allprison_lock); 1045 if (pr == NULL) 1046 return (ENXIO); 1047 prison_hold_locked(pr); 1048 mtx_unlock(&pr->pr_mtx); 1049 1050 /* Make sure the named iface exists in the source prison/vnet. */ 1051 CURVNET_SET(pr->pr_vnet); 1052 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1053 if (ifp == NULL) { 1054 CURVNET_RESTORE(); 1055 prison_free(pr); 1056 return (ENXIO); 1057 } 1058 1059 /* Do not try to move the iface from and to the same prison. */ 1060 vnet_dst = TD_TO_VNET(td); 1061 if (vnet_dst == ifp->if_vnet) { 1062 CURVNET_RESTORE(); 1063 prison_free(pr); 1064 return (EEXIST); 1065 } 1066 1067 /* Get interface back from child jail/vnet. */ 1068 if_vmove(ifp, vnet_dst); 1069 CURVNET_RESTORE(); 1070 1071 /* Report the new if_xname back to the userland. */ 1072 sprintf(ifname, "%s", ifp->if_xname); 1073 1074 prison_free(pr); 1075 return (0); 1076 } 1077 #endif /* VIMAGE */ 1078 1079 /* 1080 * Add a group to an interface 1081 */ 1082 int 1083 if_addgroup(struct ifnet *ifp, const char *groupname) 1084 { 1085 struct ifg_list *ifgl; 1086 struct ifg_group *ifg = NULL; 1087 struct ifg_member *ifgm; 1088 int new = 0; 1089 1090 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1091 groupname[strlen(groupname) - 1] <= '9') 1092 return (EINVAL); 1093 1094 IFNET_WLOCK(); 1095 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1096 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1097 IFNET_WUNLOCK(); 1098 return (EEXIST); 1099 } 1100 1101 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1102 M_NOWAIT)) == NULL) { 1103 IFNET_WUNLOCK(); 1104 return (ENOMEM); 1105 } 1106 1107 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1108 M_TEMP, M_NOWAIT)) == NULL) { 1109 free(ifgl, M_TEMP); 1110 IFNET_WUNLOCK(); 1111 return (ENOMEM); 1112 } 1113 1114 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1115 if (!strcmp(ifg->ifg_group, groupname)) 1116 break; 1117 1118 if (ifg == NULL) { 1119 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1120 M_TEMP, M_NOWAIT)) == NULL) { 1121 free(ifgl, M_TEMP); 1122 free(ifgm, M_TEMP); 1123 IFNET_WUNLOCK(); 1124 return (ENOMEM); 1125 } 1126 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1127 ifg->ifg_refcnt = 0; 1128 TAILQ_INIT(&ifg->ifg_members); 1129 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1130 new = 1; 1131 } 1132 1133 ifg->ifg_refcnt++; 1134 ifgl->ifgl_group = ifg; 1135 ifgm->ifgm_ifp = ifp; 1136 1137 IF_ADDR_WLOCK(ifp); 1138 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1139 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1140 IF_ADDR_WUNLOCK(ifp); 1141 1142 IFNET_WUNLOCK(); 1143 1144 if (new) 1145 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1146 EVENTHANDLER_INVOKE(group_change_event, groupname); 1147 1148 return (0); 1149 } 1150 1151 /* 1152 * Remove a group from an interface 1153 */ 1154 int 1155 if_delgroup(struct ifnet *ifp, const char *groupname) 1156 { 1157 struct ifg_list *ifgl; 1158 struct ifg_member *ifgm; 1159 1160 IFNET_WLOCK(); 1161 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1162 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1163 break; 1164 if (ifgl == NULL) { 1165 IFNET_WUNLOCK(); 1166 return (ENOENT); 1167 } 1168 1169 IF_ADDR_WLOCK(ifp); 1170 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1171 IF_ADDR_WUNLOCK(ifp); 1172 1173 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1174 if (ifgm->ifgm_ifp == ifp) 1175 break; 1176 1177 if (ifgm != NULL) { 1178 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1179 free(ifgm, M_TEMP); 1180 } 1181 1182 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1183 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1184 IFNET_WUNLOCK(); 1185 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1186 free(ifgl->ifgl_group, M_TEMP); 1187 } else 1188 IFNET_WUNLOCK(); 1189 1190 free(ifgl, M_TEMP); 1191 1192 EVENTHANDLER_INVOKE(group_change_event, groupname); 1193 1194 return (0); 1195 } 1196 1197 /* 1198 * Remove an interface from all groups 1199 */ 1200 static void 1201 if_delgroups(struct ifnet *ifp) 1202 { 1203 struct ifg_list *ifgl; 1204 struct ifg_member *ifgm; 1205 char groupname[IFNAMSIZ]; 1206 1207 IFNET_WLOCK(); 1208 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1209 ifgl = TAILQ_FIRST(&ifp->if_groups); 1210 1211 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1212 1213 IF_ADDR_WLOCK(ifp); 1214 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1215 IF_ADDR_WUNLOCK(ifp); 1216 1217 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1218 if (ifgm->ifgm_ifp == ifp) 1219 break; 1220 1221 if (ifgm != NULL) { 1222 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1223 ifgm_next); 1224 free(ifgm, M_TEMP); 1225 } 1226 1227 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1228 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1229 IFNET_WUNLOCK(); 1230 EVENTHANDLER_INVOKE(group_detach_event, 1231 ifgl->ifgl_group); 1232 free(ifgl->ifgl_group, M_TEMP); 1233 } else 1234 IFNET_WUNLOCK(); 1235 1236 free(ifgl, M_TEMP); 1237 1238 EVENTHANDLER_INVOKE(group_change_event, groupname); 1239 1240 IFNET_WLOCK(); 1241 } 1242 IFNET_WUNLOCK(); 1243 } 1244 1245 /* 1246 * Stores all groups from an interface in memory pointed 1247 * to by data 1248 */ 1249 static int 1250 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1251 { 1252 int len, error; 1253 struct ifg_list *ifgl; 1254 struct ifg_req ifgrq, *ifgp; 1255 struct ifgroupreq *ifgr = data; 1256 1257 if (ifgr->ifgr_len == 0) { 1258 IF_ADDR_RLOCK(ifp); 1259 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1260 ifgr->ifgr_len += sizeof(struct ifg_req); 1261 IF_ADDR_RUNLOCK(ifp); 1262 return (0); 1263 } 1264 1265 len = ifgr->ifgr_len; 1266 ifgp = ifgr->ifgr_groups; 1267 /* XXX: wire */ 1268 IF_ADDR_RLOCK(ifp); 1269 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1270 if (len < sizeof(ifgrq)) { 1271 IF_ADDR_RUNLOCK(ifp); 1272 return (EINVAL); 1273 } 1274 bzero(&ifgrq, sizeof ifgrq); 1275 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1276 sizeof(ifgrq.ifgrq_group)); 1277 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1278 IF_ADDR_RUNLOCK(ifp); 1279 return (error); 1280 } 1281 len -= sizeof(ifgrq); 1282 ifgp++; 1283 } 1284 IF_ADDR_RUNLOCK(ifp); 1285 1286 return (0); 1287 } 1288 1289 /* 1290 * Stores all members of a group in memory pointed to by data 1291 */ 1292 static int 1293 if_getgroupmembers(struct ifgroupreq *data) 1294 { 1295 struct ifgroupreq *ifgr = data; 1296 struct ifg_group *ifg; 1297 struct ifg_member *ifgm; 1298 struct ifg_req ifgrq, *ifgp; 1299 int len, error; 1300 1301 IFNET_RLOCK(); 1302 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1303 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1304 break; 1305 if (ifg == NULL) { 1306 IFNET_RUNLOCK(); 1307 return (ENOENT); 1308 } 1309 1310 if (ifgr->ifgr_len == 0) { 1311 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1312 ifgr->ifgr_len += sizeof(ifgrq); 1313 IFNET_RUNLOCK(); 1314 return (0); 1315 } 1316 1317 len = ifgr->ifgr_len; 1318 ifgp = ifgr->ifgr_groups; 1319 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1320 if (len < sizeof(ifgrq)) { 1321 IFNET_RUNLOCK(); 1322 return (EINVAL); 1323 } 1324 bzero(&ifgrq, sizeof ifgrq); 1325 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1326 sizeof(ifgrq.ifgrq_member)); 1327 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1328 IFNET_RUNLOCK(); 1329 return (error); 1330 } 1331 len -= sizeof(ifgrq); 1332 ifgp++; 1333 } 1334 IFNET_RUNLOCK(); 1335 1336 return (0); 1337 } 1338 1339 /* 1340 * Delete Routes for a Network Interface 1341 * 1342 * Called for each routing entry via the rnh->rnh_walktree() call above 1343 * to delete all route entries referencing a detaching network interface. 1344 * 1345 * Arguments: 1346 * rn pointer to node in the routing table 1347 * arg argument passed to rnh->rnh_walktree() - detaching interface 1348 * 1349 * Returns: 1350 * 0 successful 1351 * errno failed - reason indicated 1352 * 1353 */ 1354 static int 1355 if_rtdel(struct radix_node *rn, void *arg) 1356 { 1357 struct rtentry *rt = (struct rtentry *)rn; 1358 struct ifnet *ifp = arg; 1359 int err; 1360 1361 if (rt->rt_ifp == ifp) { 1362 1363 /* 1364 * Protect (sorta) against walktree recursion problems 1365 * with cloned routes 1366 */ 1367 if ((rt->rt_flags & RTF_UP) == 0) 1368 return (0); 1369 1370 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1371 rt_mask(rt), 1372 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED, 1373 (struct rtentry **) NULL, rt->rt_fibnum); 1374 if (err) { 1375 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1376 } 1377 } 1378 1379 return (0); 1380 } 1381 1382 /* 1383 * Wrapper functions for struct ifnet address list locking macros. These are 1384 * used by kernel modules to avoid encoding programming interface or binary 1385 * interface assumptions that may be violated when kernel-internal locking 1386 * approaches change. 1387 */ 1388 void 1389 if_addr_rlock(struct ifnet *ifp) 1390 { 1391 1392 IF_ADDR_RLOCK(ifp); 1393 } 1394 1395 void 1396 if_addr_runlock(struct ifnet *ifp) 1397 { 1398 1399 IF_ADDR_RUNLOCK(ifp); 1400 } 1401 1402 void 1403 if_maddr_rlock(struct ifnet *ifp) 1404 { 1405 1406 IF_ADDR_RLOCK(ifp); 1407 } 1408 1409 void 1410 if_maddr_runlock(struct ifnet *ifp) 1411 { 1412 1413 IF_ADDR_RUNLOCK(ifp); 1414 } 1415 1416 /* 1417 * Initialization, destruction and refcounting functions for ifaddrs. 1418 */ 1419 struct ifaddr * 1420 ifa_alloc(size_t size, int flags) 1421 { 1422 struct ifaddr *ifa; 1423 1424 KASSERT(size >= sizeof(struct ifaddr), 1425 ("%s: invalid size %zu", __func__, size)); 1426 1427 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1428 if (ifa == NULL) 1429 return (NULL); 1430 1431 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1432 goto fail; 1433 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1434 goto fail; 1435 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1436 goto fail; 1437 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1438 goto fail; 1439 1440 refcount_init(&ifa->ifa_refcnt, 1); 1441 1442 return (ifa); 1443 1444 fail: 1445 /* free(NULL) is okay */ 1446 counter_u64_free(ifa->ifa_opackets); 1447 counter_u64_free(ifa->ifa_ipackets); 1448 counter_u64_free(ifa->ifa_obytes); 1449 counter_u64_free(ifa->ifa_ibytes); 1450 free(ifa, M_IFADDR); 1451 1452 return (NULL); 1453 } 1454 1455 void 1456 ifa_ref(struct ifaddr *ifa) 1457 { 1458 1459 refcount_acquire(&ifa->ifa_refcnt); 1460 } 1461 1462 void 1463 ifa_free(struct ifaddr *ifa) 1464 { 1465 1466 if (refcount_release(&ifa->ifa_refcnt)) { 1467 counter_u64_free(ifa->ifa_opackets); 1468 counter_u64_free(ifa->ifa_ipackets); 1469 counter_u64_free(ifa->ifa_obytes); 1470 counter_u64_free(ifa->ifa_ibytes); 1471 free(ifa, M_IFADDR); 1472 } 1473 } 1474 1475 int 1476 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1477 { 1478 int error = 0; 1479 struct rtentry *rt = NULL; 1480 struct rt_addrinfo info; 1481 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1482 1483 bzero(&info, sizeof(info)); 1484 info.rti_ifp = V_loif; 1485 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1486 info.rti_info[RTAX_DST] = ia; 1487 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1488 error = rtrequest1_fib(RTM_ADD, &info, &rt, ifa->ifa_ifp->if_fib); 1489 1490 if (error == 0 && rt != NULL) { 1491 RT_LOCK(rt); 1492 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1493 ifa->ifa_ifp->if_type; 1494 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1495 ifa->ifa_ifp->if_index; 1496 RT_REMREF(rt); 1497 RT_UNLOCK(rt); 1498 } else if (error != 0) 1499 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error); 1500 1501 return (error); 1502 } 1503 1504 int 1505 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1506 { 1507 int error = 0; 1508 struct rt_addrinfo info; 1509 struct sockaddr_dl null_sdl; 1510 1511 bzero(&null_sdl, sizeof(null_sdl)); 1512 null_sdl.sdl_len = sizeof(null_sdl); 1513 null_sdl.sdl_family = AF_LINK; 1514 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1515 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1516 bzero(&info, sizeof(info)); 1517 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1518 info.rti_info[RTAX_DST] = ia; 1519 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1520 error = rtrequest1_fib(RTM_DELETE, &info, NULL, ifa->ifa_ifp->if_fib); 1521 1522 if (error != 0) 1523 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error); 1524 1525 return (error); 1526 } 1527 1528 int 1529 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *sa, int fib) 1530 { 1531 struct rtentry *rt; 1532 1533 rt = rtalloc1_fib(sa, 0, 0, fib); 1534 if (rt == NULL) { 1535 log(LOG_DEBUG, "%s: fail", __func__); 1536 return (EHOSTUNREACH); 1537 } 1538 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1539 ifa->ifa_ifp->if_type; 1540 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1541 ifa->ifa_ifp->if_index; 1542 RTFREE_LOCKED(rt); 1543 1544 return (0); 1545 } 1546 1547 /* 1548 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1549 * structs used to represent other address families, it is necessary 1550 * to perform a different comparison. 1551 */ 1552 1553 #define sa_dl_equal(a1, a2) \ 1554 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1555 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1556 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1557 LLADDR((struct sockaddr_dl *)(a2)), \ 1558 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1559 1560 /* 1561 * Locate an interface based on a complete address. 1562 */ 1563 /*ARGSUSED*/ 1564 static struct ifaddr * 1565 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1566 { 1567 struct ifnet *ifp; 1568 struct ifaddr *ifa; 1569 1570 IFNET_RLOCK_NOSLEEP(); 1571 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1572 IF_ADDR_RLOCK(ifp); 1573 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1574 if (ifa->ifa_addr->sa_family != addr->sa_family) 1575 continue; 1576 if (sa_equal(addr, ifa->ifa_addr)) { 1577 if (getref) 1578 ifa_ref(ifa); 1579 IF_ADDR_RUNLOCK(ifp); 1580 goto done; 1581 } 1582 /* IP6 doesn't have broadcast */ 1583 if ((ifp->if_flags & IFF_BROADCAST) && 1584 ifa->ifa_broadaddr && 1585 ifa->ifa_broadaddr->sa_len != 0 && 1586 sa_equal(ifa->ifa_broadaddr, addr)) { 1587 if (getref) 1588 ifa_ref(ifa); 1589 IF_ADDR_RUNLOCK(ifp); 1590 goto done; 1591 } 1592 } 1593 IF_ADDR_RUNLOCK(ifp); 1594 } 1595 ifa = NULL; 1596 done: 1597 IFNET_RUNLOCK_NOSLEEP(); 1598 return (ifa); 1599 } 1600 1601 struct ifaddr * 1602 ifa_ifwithaddr(struct sockaddr *addr) 1603 { 1604 1605 return (ifa_ifwithaddr_internal(addr, 1)); 1606 } 1607 1608 int 1609 ifa_ifwithaddr_check(struct sockaddr *addr) 1610 { 1611 1612 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1613 } 1614 1615 /* 1616 * Locate an interface based on the broadcast address. 1617 */ 1618 /* ARGSUSED */ 1619 struct ifaddr * 1620 ifa_ifwithbroadaddr(struct sockaddr *addr) 1621 { 1622 struct ifnet *ifp; 1623 struct ifaddr *ifa; 1624 1625 IFNET_RLOCK_NOSLEEP(); 1626 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1627 IF_ADDR_RLOCK(ifp); 1628 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1629 if (ifa->ifa_addr->sa_family != addr->sa_family) 1630 continue; 1631 if ((ifp->if_flags & IFF_BROADCAST) && 1632 ifa->ifa_broadaddr && 1633 ifa->ifa_broadaddr->sa_len != 0 && 1634 sa_equal(ifa->ifa_broadaddr, addr)) { 1635 ifa_ref(ifa); 1636 IF_ADDR_RUNLOCK(ifp); 1637 goto done; 1638 } 1639 } 1640 IF_ADDR_RUNLOCK(ifp); 1641 } 1642 ifa = NULL; 1643 done: 1644 IFNET_RUNLOCK_NOSLEEP(); 1645 return (ifa); 1646 } 1647 1648 /* 1649 * Locate the point to point interface with a given destination address. 1650 */ 1651 /*ARGSUSED*/ 1652 struct ifaddr * 1653 ifa_ifwithdstaddr(struct sockaddr *addr, int fibnum) 1654 { 1655 struct ifnet *ifp; 1656 struct ifaddr *ifa; 1657 1658 IFNET_RLOCK_NOSLEEP(); 1659 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1660 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1661 continue; 1662 if ((ifp->if_fib != fibnum)) 1663 continue; 1664 IF_ADDR_RLOCK(ifp); 1665 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1666 if (ifa->ifa_addr->sa_family != addr->sa_family) 1667 continue; 1668 if (ifa->ifa_dstaddr != NULL && 1669 sa_equal(addr, ifa->ifa_dstaddr)) { 1670 ifa_ref(ifa); 1671 IF_ADDR_RUNLOCK(ifp); 1672 goto done; 1673 } 1674 } 1675 IF_ADDR_RUNLOCK(ifp); 1676 } 1677 ifa = NULL; 1678 done: 1679 IFNET_RUNLOCK_NOSLEEP(); 1680 return (ifa); 1681 } 1682 1683 /* 1684 * Find an interface on a specific network. If many, choice 1685 * is most specific found. 1686 */ 1687 struct ifaddr * 1688 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp, int fibnum) 1689 { 1690 struct ifnet *ifp; 1691 struct ifaddr *ifa; 1692 struct ifaddr *ifa_maybe = NULL; 1693 u_int af = addr->sa_family; 1694 char *addr_data = addr->sa_data, *cplim; 1695 1696 /* 1697 * AF_LINK addresses can be looked up directly by their index number, 1698 * so do that if we can. 1699 */ 1700 if (af == AF_LINK) { 1701 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1702 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1703 return (ifaddr_byindex(sdl->sdl_index)); 1704 } 1705 1706 /* 1707 * Scan though each interface, looking for ones that have addresses 1708 * in this address family and the requested fib. Maintain a reference 1709 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that 1710 * kept it stable when we move onto the next interface. 1711 */ 1712 IFNET_RLOCK_NOSLEEP(); 1713 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1714 if (ifp->if_fib != fibnum) 1715 continue; 1716 IF_ADDR_RLOCK(ifp); 1717 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1718 char *cp, *cp2, *cp3; 1719 1720 if (ifa->ifa_addr->sa_family != af) 1721 next: continue; 1722 if (af == AF_INET && 1723 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1724 /* 1725 * This is a bit broken as it doesn't 1726 * take into account that the remote end may 1727 * be a single node in the network we are 1728 * looking for. 1729 * The trouble is that we don't know the 1730 * netmask for the remote end. 1731 */ 1732 if (ifa->ifa_dstaddr != NULL && 1733 sa_equal(addr, ifa->ifa_dstaddr)) { 1734 ifa_ref(ifa); 1735 IF_ADDR_RUNLOCK(ifp); 1736 goto done; 1737 } 1738 } else { 1739 /* 1740 * if we have a special address handler, 1741 * then use it instead of the generic one. 1742 */ 1743 if (ifa->ifa_claim_addr) { 1744 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1745 ifa_ref(ifa); 1746 IF_ADDR_RUNLOCK(ifp); 1747 goto done; 1748 } 1749 continue; 1750 } 1751 1752 /* 1753 * Scan all the bits in the ifa's address. 1754 * If a bit dissagrees with what we are 1755 * looking for, mask it with the netmask 1756 * to see if it really matters. 1757 * (A byte at a time) 1758 */ 1759 if (ifa->ifa_netmask == 0) 1760 continue; 1761 cp = addr_data; 1762 cp2 = ifa->ifa_addr->sa_data; 1763 cp3 = ifa->ifa_netmask->sa_data; 1764 cplim = ifa->ifa_netmask->sa_len 1765 + (char *)ifa->ifa_netmask; 1766 while (cp3 < cplim) 1767 if ((*cp++ ^ *cp2++) & *cp3++) 1768 goto next; /* next address! */ 1769 /* 1770 * If the netmask of what we just found 1771 * is more specific than what we had before 1772 * (if we had one), or if the virtual status 1773 * of new prefix is better than of the old one, 1774 * then remember the new one before continuing 1775 * to search for an even better one. 1776 */ 1777 if (ifa_maybe == NULL || 1778 ifa_preferred(ifa_maybe, ifa) || 1779 rn_refines((caddr_t)ifa->ifa_netmask, 1780 (caddr_t)ifa_maybe->ifa_netmask)) { 1781 if (ifa_maybe != NULL) 1782 ifa_free(ifa_maybe); 1783 ifa_maybe = ifa; 1784 ifa_ref(ifa_maybe); 1785 } 1786 } 1787 } 1788 IF_ADDR_RUNLOCK(ifp); 1789 } 1790 ifa = ifa_maybe; 1791 ifa_maybe = NULL; 1792 done: 1793 IFNET_RUNLOCK_NOSLEEP(); 1794 if (ifa_maybe != NULL) 1795 ifa_free(ifa_maybe); 1796 return (ifa); 1797 } 1798 1799 /* 1800 * Find an interface address specific to an interface best matching 1801 * a given address. 1802 */ 1803 struct ifaddr * 1804 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1805 { 1806 struct ifaddr *ifa; 1807 char *cp, *cp2, *cp3; 1808 char *cplim; 1809 struct ifaddr *ifa_maybe = NULL; 1810 u_int af = addr->sa_family; 1811 1812 if (af >= AF_MAX) 1813 return (NULL); 1814 IF_ADDR_RLOCK(ifp); 1815 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1816 if (ifa->ifa_addr->sa_family != af) 1817 continue; 1818 if (ifa_maybe == NULL) 1819 ifa_maybe = ifa; 1820 if (ifa->ifa_netmask == 0) { 1821 if (sa_equal(addr, ifa->ifa_addr) || 1822 (ifa->ifa_dstaddr && 1823 sa_equal(addr, ifa->ifa_dstaddr))) 1824 goto done; 1825 continue; 1826 } 1827 if (ifp->if_flags & IFF_POINTOPOINT) { 1828 if (sa_equal(addr, ifa->ifa_dstaddr)) 1829 goto done; 1830 } else { 1831 cp = addr->sa_data; 1832 cp2 = ifa->ifa_addr->sa_data; 1833 cp3 = ifa->ifa_netmask->sa_data; 1834 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1835 for (; cp3 < cplim; cp3++) 1836 if ((*cp++ ^ *cp2++) & *cp3) 1837 break; 1838 if (cp3 == cplim) 1839 goto done; 1840 } 1841 } 1842 ifa = ifa_maybe; 1843 done: 1844 if (ifa != NULL) 1845 ifa_ref(ifa); 1846 IF_ADDR_RUNLOCK(ifp); 1847 return (ifa); 1848 } 1849 1850 /* 1851 * See whether new ifa is better than current one: 1852 * 1) A non-virtual one is preferred over virtual. 1853 * 2) A virtual in master state preferred over any other state. 1854 * 1855 * Used in several address selecting functions. 1856 */ 1857 int 1858 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 1859 { 1860 1861 return (cur->ifa_carp && (!next->ifa_carp || 1862 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 1863 } 1864 1865 #include <net/if_llatbl.h> 1866 1867 /* 1868 * Default action when installing a route with a Link Level gateway. 1869 * Lookup an appropriate real ifa to point to. 1870 * This should be moved to /sys/net/link.c eventually. 1871 */ 1872 static void 1873 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1874 { 1875 struct ifaddr *ifa, *oifa; 1876 struct sockaddr *dst; 1877 struct ifnet *ifp; 1878 1879 RT_LOCK_ASSERT(rt); 1880 1881 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1882 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1883 return; 1884 ifa = ifaof_ifpforaddr(dst, ifp); 1885 if (ifa) { 1886 oifa = rt->rt_ifa; 1887 rt->rt_ifa = ifa; 1888 ifa_free(oifa); 1889 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1890 ifa->ifa_rtrequest(cmd, rt, info); 1891 } 1892 } 1893 1894 struct sockaddr_dl * 1895 link_alloc_sdl(size_t size, int flags) 1896 { 1897 1898 return (malloc(size, M_TEMP, flags)); 1899 } 1900 1901 void 1902 link_free_sdl(struct sockaddr *sa) 1903 { 1904 free(sa, M_TEMP); 1905 } 1906 1907 /* 1908 * Fills in given sdl with interface basic info. 1909 * Returns pointer to filled sdl. 1910 */ 1911 struct sockaddr_dl * 1912 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 1913 { 1914 struct sockaddr_dl *sdl; 1915 1916 sdl = (struct sockaddr_dl *)paddr; 1917 memset(sdl, 0, sizeof(struct sockaddr_dl)); 1918 sdl->sdl_len = sizeof(struct sockaddr_dl); 1919 sdl->sdl_family = AF_LINK; 1920 sdl->sdl_index = ifp->if_index; 1921 sdl->sdl_type = iftype; 1922 1923 return (sdl); 1924 } 1925 1926 /* 1927 * Mark an interface down and notify protocols of 1928 * the transition. 1929 */ 1930 static void 1931 if_unroute(struct ifnet *ifp, int flag, int fam) 1932 { 1933 struct ifaddr *ifa; 1934 1935 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1936 1937 ifp->if_flags &= ~flag; 1938 getmicrotime(&ifp->if_lastchange); 1939 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1940 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1941 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1942 ifp->if_qflush(ifp); 1943 1944 if (ifp->if_carp) 1945 (*carp_linkstate_p)(ifp); 1946 rt_ifmsg(ifp); 1947 } 1948 1949 /* 1950 * Mark an interface up and notify protocols of 1951 * the transition. 1952 */ 1953 static void 1954 if_route(struct ifnet *ifp, int flag, int fam) 1955 { 1956 struct ifaddr *ifa; 1957 1958 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1959 1960 ifp->if_flags |= flag; 1961 getmicrotime(&ifp->if_lastchange); 1962 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1963 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1964 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1965 if (ifp->if_carp) 1966 (*carp_linkstate_p)(ifp); 1967 rt_ifmsg(ifp); 1968 #ifdef INET6 1969 in6_if_up(ifp); 1970 #endif 1971 } 1972 1973 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1974 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1975 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1976 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1977 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1978 int (*vlan_setcookie_p)(struct ifnet *, void *); 1979 void *(*vlan_cookie_p)(struct ifnet *); 1980 1981 /* 1982 * Handle a change in the interface link state. To avoid LORs 1983 * between driver lock and upper layer locks, as well as possible 1984 * recursions, we post event to taskqueue, and all job 1985 * is done in static do_link_state_change(). 1986 */ 1987 void 1988 if_link_state_change(struct ifnet *ifp, int link_state) 1989 { 1990 /* Return if state hasn't changed. */ 1991 if (ifp->if_link_state == link_state) 1992 return; 1993 1994 ifp->if_link_state = link_state; 1995 1996 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1997 } 1998 1999 static void 2000 do_link_state_change(void *arg, int pending) 2001 { 2002 struct ifnet *ifp = (struct ifnet *)arg; 2003 int link_state = ifp->if_link_state; 2004 CURVNET_SET(ifp->if_vnet); 2005 2006 /* Notify that the link state has changed. */ 2007 rt_ifmsg(ifp); 2008 if (ifp->if_vlantrunk != NULL) 2009 (*vlan_link_state_p)(ifp); 2010 2011 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2012 IFP2AC(ifp)->ac_netgraph != NULL) 2013 (*ng_ether_link_state_p)(ifp, link_state); 2014 if (ifp->if_carp) 2015 (*carp_linkstate_p)(ifp); 2016 if (ifp->if_bridge) 2017 (*bridge_linkstate_p)(ifp); 2018 if (ifp->if_lagg) 2019 (*lagg_linkstate_p)(ifp, link_state); 2020 2021 if (IS_DEFAULT_VNET(curvnet)) 2022 devctl_notify("IFNET", ifp->if_xname, 2023 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2024 NULL); 2025 if (pending > 1) 2026 if_printf(ifp, "%d link states coalesced\n", pending); 2027 if (log_link_state_change) 2028 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 2029 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2030 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 2031 CURVNET_RESTORE(); 2032 } 2033 2034 /* 2035 * Mark an interface down and notify protocols of 2036 * the transition. 2037 */ 2038 void 2039 if_down(struct ifnet *ifp) 2040 { 2041 2042 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2043 } 2044 2045 /* 2046 * Mark an interface up and notify protocols of 2047 * the transition. 2048 */ 2049 void 2050 if_up(struct ifnet *ifp) 2051 { 2052 2053 if_route(ifp, IFF_UP, AF_UNSPEC); 2054 } 2055 2056 /* 2057 * Flush an interface queue. 2058 */ 2059 void 2060 if_qflush(struct ifnet *ifp) 2061 { 2062 struct mbuf *m, *n; 2063 struct ifaltq *ifq; 2064 2065 ifq = &ifp->if_snd; 2066 IFQ_LOCK(ifq); 2067 #ifdef ALTQ 2068 if (ALTQ_IS_ENABLED(ifq)) 2069 ALTQ_PURGE(ifq); 2070 #endif 2071 n = ifq->ifq_head; 2072 while ((m = n) != 0) { 2073 n = m->m_act; 2074 m_freem(m); 2075 } 2076 ifq->ifq_head = 0; 2077 ifq->ifq_tail = 0; 2078 ifq->ifq_len = 0; 2079 IFQ_UNLOCK(ifq); 2080 } 2081 2082 /* 2083 * Map interface name to interface structure pointer, with or without 2084 * returning a reference. 2085 */ 2086 struct ifnet * 2087 ifunit_ref(const char *name) 2088 { 2089 struct ifnet *ifp; 2090 2091 IFNET_RLOCK_NOSLEEP(); 2092 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2093 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2094 !(ifp->if_flags & IFF_DYING)) 2095 break; 2096 } 2097 if (ifp != NULL) 2098 if_ref(ifp); 2099 IFNET_RUNLOCK_NOSLEEP(); 2100 return (ifp); 2101 } 2102 2103 struct ifnet * 2104 ifunit(const char *name) 2105 { 2106 struct ifnet *ifp; 2107 2108 IFNET_RLOCK_NOSLEEP(); 2109 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2110 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2111 break; 2112 } 2113 IFNET_RUNLOCK_NOSLEEP(); 2114 return (ifp); 2115 } 2116 2117 /* 2118 * Hardware specific interface ioctls. 2119 */ 2120 static int 2121 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2122 { 2123 struct ifreq *ifr; 2124 int error = 0; 2125 int new_flags, temp_flags; 2126 size_t namelen, onamelen; 2127 size_t descrlen; 2128 char *descrbuf, *odescrbuf; 2129 char new_name[IFNAMSIZ]; 2130 struct ifaddr *ifa; 2131 struct sockaddr_dl *sdl; 2132 2133 ifr = (struct ifreq *)data; 2134 switch (cmd) { 2135 case SIOCGIFINDEX: 2136 ifr->ifr_index = ifp->if_index; 2137 break; 2138 2139 case SIOCGIFFLAGS: 2140 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2141 ifr->ifr_flags = temp_flags & 0xffff; 2142 ifr->ifr_flagshigh = temp_flags >> 16; 2143 break; 2144 2145 case SIOCGIFCAP: 2146 ifr->ifr_reqcap = ifp->if_capabilities; 2147 ifr->ifr_curcap = ifp->if_capenable; 2148 break; 2149 2150 #ifdef MAC 2151 case SIOCGIFMAC: 2152 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2153 break; 2154 #endif 2155 2156 case SIOCGIFMETRIC: 2157 ifr->ifr_metric = ifp->if_metric; 2158 break; 2159 2160 case SIOCGIFMTU: 2161 ifr->ifr_mtu = ifp->if_mtu; 2162 break; 2163 2164 case SIOCGIFPHYS: 2165 ifr->ifr_phys = ifp->if_physical; 2166 break; 2167 2168 case SIOCGIFDESCR: 2169 error = 0; 2170 sx_slock(&ifdescr_sx); 2171 if (ifp->if_description == NULL) 2172 error = ENOMSG; 2173 else { 2174 /* space for terminating nul */ 2175 descrlen = strlen(ifp->if_description) + 1; 2176 if (ifr->ifr_buffer.length < descrlen) 2177 ifr->ifr_buffer.buffer = NULL; 2178 else 2179 error = copyout(ifp->if_description, 2180 ifr->ifr_buffer.buffer, descrlen); 2181 ifr->ifr_buffer.length = descrlen; 2182 } 2183 sx_sunlock(&ifdescr_sx); 2184 break; 2185 2186 case SIOCSIFDESCR: 2187 error = priv_check(td, PRIV_NET_SETIFDESCR); 2188 if (error) 2189 return (error); 2190 2191 /* 2192 * Copy only (length-1) bytes to make sure that 2193 * if_description is always nul terminated. The 2194 * length parameter is supposed to count the 2195 * terminating nul in. 2196 */ 2197 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2198 return (ENAMETOOLONG); 2199 else if (ifr->ifr_buffer.length == 0) 2200 descrbuf = NULL; 2201 else { 2202 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2203 M_WAITOK | M_ZERO); 2204 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2205 ifr->ifr_buffer.length - 1); 2206 if (error) { 2207 free(descrbuf, M_IFDESCR); 2208 break; 2209 } 2210 } 2211 2212 sx_xlock(&ifdescr_sx); 2213 odescrbuf = ifp->if_description; 2214 ifp->if_description = descrbuf; 2215 sx_xunlock(&ifdescr_sx); 2216 2217 getmicrotime(&ifp->if_lastchange); 2218 free(odescrbuf, M_IFDESCR); 2219 break; 2220 2221 case SIOCGIFFIB: 2222 ifr->ifr_fib = ifp->if_fib; 2223 break; 2224 2225 case SIOCSIFFIB: 2226 error = priv_check(td, PRIV_NET_SETIFFIB); 2227 if (error) 2228 return (error); 2229 if (ifr->ifr_fib >= rt_numfibs) 2230 return (EINVAL); 2231 2232 ifp->if_fib = ifr->ifr_fib; 2233 break; 2234 2235 case SIOCSIFFLAGS: 2236 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2237 if (error) 2238 return (error); 2239 /* 2240 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2241 * check, so we don't need special handling here yet. 2242 */ 2243 new_flags = (ifr->ifr_flags & 0xffff) | 2244 (ifr->ifr_flagshigh << 16); 2245 if (ifp->if_flags & IFF_UP && 2246 (new_flags & IFF_UP) == 0) { 2247 if_down(ifp); 2248 } else if (new_flags & IFF_UP && 2249 (ifp->if_flags & IFF_UP) == 0) { 2250 if_up(ifp); 2251 } 2252 /* See if permanently promiscuous mode bit is about to flip */ 2253 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2254 if (new_flags & IFF_PPROMISC) 2255 ifp->if_flags |= IFF_PROMISC; 2256 else if (ifp->if_pcount == 0) 2257 ifp->if_flags &= ~IFF_PROMISC; 2258 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2259 ifp->if_xname, 2260 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2261 } 2262 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2263 (new_flags &~ IFF_CANTCHANGE); 2264 if (ifp->if_ioctl) { 2265 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2266 } 2267 getmicrotime(&ifp->if_lastchange); 2268 break; 2269 2270 case SIOCSIFCAP: 2271 error = priv_check(td, PRIV_NET_SETIFCAP); 2272 if (error) 2273 return (error); 2274 if (ifp->if_ioctl == NULL) 2275 return (EOPNOTSUPP); 2276 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2277 return (EINVAL); 2278 error = (*ifp->if_ioctl)(ifp, cmd, data); 2279 if (error == 0) 2280 getmicrotime(&ifp->if_lastchange); 2281 break; 2282 2283 #ifdef MAC 2284 case SIOCSIFMAC: 2285 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2286 break; 2287 #endif 2288 2289 case SIOCSIFNAME: 2290 error = priv_check(td, PRIV_NET_SETIFNAME); 2291 if (error) 2292 return (error); 2293 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2294 if (error != 0) 2295 return (error); 2296 if (new_name[0] == '\0') 2297 return (EINVAL); 2298 if (ifunit(new_name) != NULL) 2299 return (EEXIST); 2300 2301 /* 2302 * XXX: Locking. Nothing else seems to lock if_flags, 2303 * and there are numerous other races with the 2304 * ifunit() checks not being atomic with namespace 2305 * changes (renames, vmoves, if_attach, etc). 2306 */ 2307 ifp->if_flags |= IFF_RENAMING; 2308 2309 /* Announce the departure of the interface. */ 2310 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2311 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2312 2313 log(LOG_INFO, "%s: changing name to '%s'\n", 2314 ifp->if_xname, new_name); 2315 2316 IF_ADDR_WLOCK(ifp); 2317 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2318 ifa = ifp->if_addr; 2319 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2320 namelen = strlen(new_name); 2321 onamelen = sdl->sdl_nlen; 2322 /* 2323 * Move the address if needed. This is safe because we 2324 * allocate space for a name of length IFNAMSIZ when we 2325 * create this in if_attach(). 2326 */ 2327 if (namelen != onamelen) { 2328 bcopy(sdl->sdl_data + onamelen, 2329 sdl->sdl_data + namelen, sdl->sdl_alen); 2330 } 2331 bcopy(new_name, sdl->sdl_data, namelen); 2332 sdl->sdl_nlen = namelen; 2333 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2334 bzero(sdl->sdl_data, onamelen); 2335 while (namelen != 0) 2336 sdl->sdl_data[--namelen] = 0xff; 2337 IF_ADDR_WUNLOCK(ifp); 2338 2339 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2340 /* Announce the return of the interface. */ 2341 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2342 2343 ifp->if_flags &= ~IFF_RENAMING; 2344 break; 2345 2346 #ifdef VIMAGE 2347 case SIOCSIFVNET: 2348 error = priv_check(td, PRIV_NET_SETIFVNET); 2349 if (error) 2350 return (error); 2351 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2352 break; 2353 #endif 2354 2355 case SIOCSIFMETRIC: 2356 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2357 if (error) 2358 return (error); 2359 ifp->if_metric = ifr->ifr_metric; 2360 getmicrotime(&ifp->if_lastchange); 2361 break; 2362 2363 case SIOCSIFPHYS: 2364 error = priv_check(td, PRIV_NET_SETIFPHYS); 2365 if (error) 2366 return (error); 2367 if (ifp->if_ioctl == NULL) 2368 return (EOPNOTSUPP); 2369 error = (*ifp->if_ioctl)(ifp, cmd, data); 2370 if (error == 0) 2371 getmicrotime(&ifp->if_lastchange); 2372 break; 2373 2374 case SIOCSIFMTU: 2375 { 2376 u_long oldmtu = ifp->if_mtu; 2377 2378 error = priv_check(td, PRIV_NET_SETIFMTU); 2379 if (error) 2380 return (error); 2381 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2382 return (EINVAL); 2383 if (ifp->if_ioctl == NULL) 2384 return (EOPNOTSUPP); 2385 error = (*ifp->if_ioctl)(ifp, cmd, data); 2386 if (error == 0) { 2387 getmicrotime(&ifp->if_lastchange); 2388 rt_ifmsg(ifp); 2389 } 2390 /* 2391 * If the link MTU changed, do network layer specific procedure. 2392 */ 2393 if (ifp->if_mtu != oldmtu) { 2394 #ifdef INET6 2395 nd6_setmtu(ifp); 2396 #endif 2397 } 2398 break; 2399 } 2400 2401 case SIOCADDMULTI: 2402 case SIOCDELMULTI: 2403 if (cmd == SIOCADDMULTI) 2404 error = priv_check(td, PRIV_NET_ADDMULTI); 2405 else 2406 error = priv_check(td, PRIV_NET_DELMULTI); 2407 if (error) 2408 return (error); 2409 2410 /* Don't allow group membership on non-multicast interfaces. */ 2411 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2412 return (EOPNOTSUPP); 2413 2414 /* Don't let users screw up protocols' entries. */ 2415 if (ifr->ifr_addr.sa_family != AF_LINK) 2416 return (EINVAL); 2417 2418 if (cmd == SIOCADDMULTI) { 2419 struct ifmultiaddr *ifma; 2420 2421 /* 2422 * Userland is only permitted to join groups once 2423 * via the if_addmulti() KPI, because it cannot hold 2424 * struct ifmultiaddr * between calls. It may also 2425 * lose a race while we check if the membership 2426 * already exists. 2427 */ 2428 IF_ADDR_RLOCK(ifp); 2429 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2430 IF_ADDR_RUNLOCK(ifp); 2431 if (ifma != NULL) 2432 error = EADDRINUSE; 2433 else 2434 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2435 } else { 2436 error = if_delmulti(ifp, &ifr->ifr_addr); 2437 } 2438 if (error == 0) 2439 getmicrotime(&ifp->if_lastchange); 2440 break; 2441 2442 case SIOCSIFPHYADDR: 2443 case SIOCDIFPHYADDR: 2444 #ifdef INET6 2445 case SIOCSIFPHYADDR_IN6: 2446 #endif 2447 case SIOCSIFMEDIA: 2448 case SIOCSIFGENERIC: 2449 error = priv_check(td, PRIV_NET_HWIOCTL); 2450 if (error) 2451 return (error); 2452 if (ifp->if_ioctl == NULL) 2453 return (EOPNOTSUPP); 2454 error = (*ifp->if_ioctl)(ifp, cmd, data); 2455 if (error == 0) 2456 getmicrotime(&ifp->if_lastchange); 2457 break; 2458 2459 case SIOCGIFSTATUS: 2460 case SIOCGIFPSRCADDR: 2461 case SIOCGIFPDSTADDR: 2462 case SIOCGIFMEDIA: 2463 case SIOCGIFGENERIC: 2464 if (ifp->if_ioctl == NULL) 2465 return (EOPNOTSUPP); 2466 error = (*ifp->if_ioctl)(ifp, cmd, data); 2467 break; 2468 2469 case SIOCSIFLLADDR: 2470 error = priv_check(td, PRIV_NET_SETLLADDR); 2471 if (error) 2472 return (error); 2473 error = if_setlladdr(ifp, 2474 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2475 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2476 break; 2477 2478 case SIOCAIFGROUP: 2479 { 2480 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2481 2482 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2483 if (error) 2484 return (error); 2485 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2486 return (error); 2487 break; 2488 } 2489 2490 case SIOCGIFGROUP: 2491 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2492 return (error); 2493 break; 2494 2495 case SIOCDIFGROUP: 2496 { 2497 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2498 2499 error = priv_check(td, PRIV_NET_DELIFGROUP); 2500 if (error) 2501 return (error); 2502 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2503 return (error); 2504 break; 2505 } 2506 2507 default: 2508 error = ENOIOCTL; 2509 break; 2510 } 2511 return (error); 2512 } 2513 2514 #ifdef COMPAT_FREEBSD32 2515 struct ifconf32 { 2516 int32_t ifc_len; 2517 union { 2518 uint32_t ifcu_buf; 2519 uint32_t ifcu_req; 2520 } ifc_ifcu; 2521 }; 2522 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2523 #endif 2524 2525 /* 2526 * Interface ioctls. 2527 */ 2528 int 2529 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2530 { 2531 struct ifnet *ifp; 2532 struct ifreq *ifr; 2533 int error; 2534 int oif_flags; 2535 2536 CURVNET_SET(so->so_vnet); 2537 switch (cmd) { 2538 case SIOCGIFCONF: 2539 error = ifconf(cmd, data); 2540 CURVNET_RESTORE(); 2541 return (error); 2542 2543 #ifdef COMPAT_FREEBSD32 2544 case SIOCGIFCONF32: 2545 { 2546 struct ifconf32 *ifc32; 2547 struct ifconf ifc; 2548 2549 ifc32 = (struct ifconf32 *)data; 2550 ifc.ifc_len = ifc32->ifc_len; 2551 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2552 2553 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2554 CURVNET_RESTORE(); 2555 if (error == 0) 2556 ifc32->ifc_len = ifc.ifc_len; 2557 return (error); 2558 } 2559 #endif 2560 } 2561 ifr = (struct ifreq *)data; 2562 2563 switch (cmd) { 2564 #ifdef VIMAGE 2565 case SIOCSIFRVNET: 2566 error = priv_check(td, PRIV_NET_SETIFVNET); 2567 if (error == 0) 2568 error = if_vmove_reclaim(td, ifr->ifr_name, 2569 ifr->ifr_jid); 2570 CURVNET_RESTORE(); 2571 return (error); 2572 #endif 2573 case SIOCIFCREATE: 2574 case SIOCIFCREATE2: 2575 error = priv_check(td, PRIV_NET_IFCREATE); 2576 if (error == 0) 2577 error = if_clone_create(ifr->ifr_name, 2578 sizeof(ifr->ifr_name), 2579 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2580 CURVNET_RESTORE(); 2581 return (error); 2582 case SIOCIFDESTROY: 2583 error = priv_check(td, PRIV_NET_IFDESTROY); 2584 if (error == 0) 2585 error = if_clone_destroy(ifr->ifr_name); 2586 CURVNET_RESTORE(); 2587 return (error); 2588 2589 case SIOCIFGCLONERS: 2590 error = if_clone_list((struct if_clonereq *)data); 2591 CURVNET_RESTORE(); 2592 return (error); 2593 case SIOCGIFGMEMB: 2594 error = if_getgroupmembers((struct ifgroupreq *)data); 2595 CURVNET_RESTORE(); 2596 return (error); 2597 #if defined(INET) || defined(INET6) 2598 case SIOCSVH: 2599 case SIOCGVH: 2600 if (carp_ioctl_p == NULL) 2601 error = EPROTONOSUPPORT; 2602 else 2603 error = (*carp_ioctl_p)(ifr, cmd, td); 2604 CURVNET_RESTORE(); 2605 return (error); 2606 #endif 2607 } 2608 2609 ifp = ifunit_ref(ifr->ifr_name); 2610 if (ifp == NULL) { 2611 CURVNET_RESTORE(); 2612 return (ENXIO); 2613 } 2614 2615 error = ifhwioctl(cmd, ifp, data, td); 2616 if (error != ENOIOCTL) { 2617 if_rele(ifp); 2618 CURVNET_RESTORE(); 2619 return (error); 2620 } 2621 2622 oif_flags = ifp->if_flags; 2623 if (so->so_proto == NULL) { 2624 if_rele(ifp); 2625 CURVNET_RESTORE(); 2626 return (EOPNOTSUPP); 2627 } 2628 2629 /* 2630 * Pass the request on to the socket control method, and if the 2631 * latter returns EOPNOTSUPP, directly to the interface. 2632 * 2633 * Make an exception for the legacy SIOCSIF* requests. Drivers 2634 * trust SIOCSIFADDR et al to come from an already privileged 2635 * layer, and do not perform any credentials checks or input 2636 * validation. 2637 */ 2638 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 2639 ifp, td)); 2640 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 2641 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 2642 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 2643 error = (*ifp->if_ioctl)(ifp, cmd, data); 2644 2645 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2646 #ifdef INET6 2647 if (ifp->if_flags & IFF_UP) 2648 in6_if_up(ifp); 2649 #endif 2650 } 2651 if_rele(ifp); 2652 CURVNET_RESTORE(); 2653 return (error); 2654 } 2655 2656 /* 2657 * The code common to handling reference counted flags, 2658 * e.g., in ifpromisc() and if_allmulti(). 2659 * The "pflag" argument can specify a permanent mode flag to check, 2660 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2661 * 2662 * Only to be used on stack-owned flags, not driver-owned flags. 2663 */ 2664 static int 2665 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2666 { 2667 struct ifreq ifr; 2668 int error; 2669 int oldflags, oldcount; 2670 2671 /* Sanity checks to catch programming errors */ 2672 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2673 ("%s: setting driver-owned flag %d", __func__, flag)); 2674 2675 if (onswitch) 2676 KASSERT(*refcount >= 0, 2677 ("%s: increment negative refcount %d for flag %d", 2678 __func__, *refcount, flag)); 2679 else 2680 KASSERT(*refcount > 0, 2681 ("%s: decrement non-positive refcount %d for flag %d", 2682 __func__, *refcount, flag)); 2683 2684 /* In case this mode is permanent, just touch refcount */ 2685 if (ifp->if_flags & pflag) { 2686 *refcount += onswitch ? 1 : -1; 2687 return (0); 2688 } 2689 2690 /* Save ifnet parameters for if_ioctl() may fail */ 2691 oldcount = *refcount; 2692 oldflags = ifp->if_flags; 2693 2694 /* 2695 * See if we aren't the only and touching refcount is enough. 2696 * Actually toggle interface flag if we are the first or last. 2697 */ 2698 if (onswitch) { 2699 if ((*refcount)++) 2700 return (0); 2701 ifp->if_flags |= flag; 2702 } else { 2703 if (--(*refcount)) 2704 return (0); 2705 ifp->if_flags &= ~flag; 2706 } 2707 2708 /* Call down the driver since we've changed interface flags */ 2709 if (ifp->if_ioctl == NULL) { 2710 error = EOPNOTSUPP; 2711 goto recover; 2712 } 2713 ifr.ifr_flags = ifp->if_flags & 0xffff; 2714 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2715 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2716 if (error) 2717 goto recover; 2718 /* Notify userland that interface flags have changed */ 2719 rt_ifmsg(ifp); 2720 return (0); 2721 2722 recover: 2723 /* Recover after driver error */ 2724 *refcount = oldcount; 2725 ifp->if_flags = oldflags; 2726 return (error); 2727 } 2728 2729 /* 2730 * Set/clear promiscuous mode on interface ifp based on the truth value 2731 * of pswitch. The calls are reference counted so that only the first 2732 * "on" request actually has an effect, as does the final "off" request. 2733 * Results are undefined if the "off" and "on" requests are not matched. 2734 */ 2735 int 2736 ifpromisc(struct ifnet *ifp, int pswitch) 2737 { 2738 int error; 2739 int oldflags = ifp->if_flags; 2740 2741 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2742 &ifp->if_pcount, pswitch); 2743 /* If promiscuous mode status has changed, log a message */ 2744 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2745 log(LOG_INFO, "%s: promiscuous mode %s\n", 2746 ifp->if_xname, 2747 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2748 return (error); 2749 } 2750 2751 /* 2752 * Return interface configuration 2753 * of system. List may be used 2754 * in later ioctl's (above) to get 2755 * other information. 2756 */ 2757 /*ARGSUSED*/ 2758 static int 2759 ifconf(u_long cmd, caddr_t data) 2760 { 2761 struct ifconf *ifc = (struct ifconf *)data; 2762 struct ifnet *ifp; 2763 struct ifaddr *ifa; 2764 struct ifreq ifr; 2765 struct sbuf *sb; 2766 int error, full = 0, valid_len, max_len; 2767 2768 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2769 max_len = MAXPHYS - 1; 2770 2771 /* Prevent hostile input from being able to crash the system */ 2772 if (ifc->ifc_len <= 0) 2773 return (EINVAL); 2774 2775 again: 2776 if (ifc->ifc_len <= max_len) { 2777 max_len = ifc->ifc_len; 2778 full = 1; 2779 } 2780 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2781 max_len = 0; 2782 valid_len = 0; 2783 2784 IFNET_RLOCK(); 2785 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2786 int addrs; 2787 2788 /* 2789 * Zero the ifr_name buffer to make sure we don't 2790 * disclose the contents of the stack. 2791 */ 2792 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2793 2794 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2795 >= sizeof(ifr.ifr_name)) { 2796 sbuf_delete(sb); 2797 IFNET_RUNLOCK(); 2798 return (ENAMETOOLONG); 2799 } 2800 2801 addrs = 0; 2802 IF_ADDR_RLOCK(ifp); 2803 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2804 struct sockaddr *sa = ifa->ifa_addr; 2805 2806 if (prison_if(curthread->td_ucred, sa) != 0) 2807 continue; 2808 addrs++; 2809 if (sa->sa_len <= sizeof(*sa)) { 2810 ifr.ifr_addr = *sa; 2811 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2812 max_len += sizeof(ifr); 2813 } else { 2814 sbuf_bcat(sb, &ifr, 2815 offsetof(struct ifreq, ifr_addr)); 2816 max_len += offsetof(struct ifreq, ifr_addr); 2817 sbuf_bcat(sb, sa, sa->sa_len); 2818 max_len += sa->sa_len; 2819 } 2820 2821 if (sbuf_error(sb) == 0) 2822 valid_len = sbuf_len(sb); 2823 } 2824 IF_ADDR_RUNLOCK(ifp); 2825 if (addrs == 0) { 2826 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2827 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2828 max_len += sizeof(ifr); 2829 2830 if (sbuf_error(sb) == 0) 2831 valid_len = sbuf_len(sb); 2832 } 2833 } 2834 IFNET_RUNLOCK(); 2835 2836 /* 2837 * If we didn't allocate enough space (uncommon), try again. If 2838 * we have already allocated as much space as we are allowed, 2839 * return what we've got. 2840 */ 2841 if (valid_len != max_len && !full) { 2842 sbuf_delete(sb); 2843 goto again; 2844 } 2845 2846 ifc->ifc_len = valid_len; 2847 sbuf_finish(sb); 2848 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2849 sbuf_delete(sb); 2850 return (error); 2851 } 2852 2853 /* 2854 * Just like ifpromisc(), but for all-multicast-reception mode. 2855 */ 2856 int 2857 if_allmulti(struct ifnet *ifp, int onswitch) 2858 { 2859 2860 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2861 } 2862 2863 struct ifmultiaddr * 2864 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2865 { 2866 struct ifmultiaddr *ifma; 2867 2868 IF_ADDR_LOCK_ASSERT(ifp); 2869 2870 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2871 if (sa->sa_family == AF_LINK) { 2872 if (sa_dl_equal(ifma->ifma_addr, sa)) 2873 break; 2874 } else { 2875 if (sa_equal(ifma->ifma_addr, sa)) 2876 break; 2877 } 2878 } 2879 2880 return ifma; 2881 } 2882 2883 /* 2884 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2885 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2886 * the ifnet multicast address list here, so the caller must do that and 2887 * other setup work (such as notifying the device driver). The reference 2888 * count is initialized to 1. 2889 */ 2890 static struct ifmultiaddr * 2891 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2892 int mflags) 2893 { 2894 struct ifmultiaddr *ifma; 2895 struct sockaddr *dupsa; 2896 2897 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2898 M_ZERO); 2899 if (ifma == NULL) 2900 return (NULL); 2901 2902 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2903 if (dupsa == NULL) { 2904 free(ifma, M_IFMADDR); 2905 return (NULL); 2906 } 2907 bcopy(sa, dupsa, sa->sa_len); 2908 ifma->ifma_addr = dupsa; 2909 2910 ifma->ifma_ifp = ifp; 2911 ifma->ifma_refcount = 1; 2912 ifma->ifma_protospec = NULL; 2913 2914 if (llsa == NULL) { 2915 ifma->ifma_lladdr = NULL; 2916 return (ifma); 2917 } 2918 2919 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2920 if (dupsa == NULL) { 2921 free(ifma->ifma_addr, M_IFMADDR); 2922 free(ifma, M_IFMADDR); 2923 return (NULL); 2924 } 2925 bcopy(llsa, dupsa, llsa->sa_len); 2926 ifma->ifma_lladdr = dupsa; 2927 2928 return (ifma); 2929 } 2930 2931 /* 2932 * if_freemulti: free ifmultiaddr structure and possibly attached related 2933 * addresses. The caller is responsible for implementing reference 2934 * counting, notifying the driver, handling routing messages, and releasing 2935 * any dependent link layer state. 2936 */ 2937 static void 2938 if_freemulti(struct ifmultiaddr *ifma) 2939 { 2940 2941 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2942 ifma->ifma_refcount)); 2943 2944 if (ifma->ifma_lladdr != NULL) 2945 free(ifma->ifma_lladdr, M_IFMADDR); 2946 free(ifma->ifma_addr, M_IFMADDR); 2947 free(ifma, M_IFMADDR); 2948 } 2949 2950 /* 2951 * Register an additional multicast address with a network interface. 2952 * 2953 * - If the address is already present, bump the reference count on the 2954 * address and return. 2955 * - If the address is not link-layer, look up a link layer address. 2956 * - Allocate address structures for one or both addresses, and attach to the 2957 * multicast address list on the interface. If automatically adding a link 2958 * layer address, the protocol address will own a reference to the link 2959 * layer address, to be freed when it is freed. 2960 * - Notify the network device driver of an addition to the multicast address 2961 * list. 2962 * 2963 * 'sa' points to caller-owned memory with the desired multicast address. 2964 * 2965 * 'retifma' will be used to return a pointer to the resulting multicast 2966 * address reference, if desired. 2967 */ 2968 int 2969 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2970 struct ifmultiaddr **retifma) 2971 { 2972 struct ifmultiaddr *ifma, *ll_ifma; 2973 struct sockaddr *llsa; 2974 struct sockaddr_dl sdl; 2975 int error; 2976 2977 /* 2978 * If the address is already present, return a new reference to it; 2979 * otherwise, allocate storage and set up a new address. 2980 */ 2981 IF_ADDR_WLOCK(ifp); 2982 ifma = if_findmulti(ifp, sa); 2983 if (ifma != NULL) { 2984 ifma->ifma_refcount++; 2985 if (retifma != NULL) 2986 *retifma = ifma; 2987 IF_ADDR_WUNLOCK(ifp); 2988 return (0); 2989 } 2990 2991 /* 2992 * The address isn't already present; resolve the protocol address 2993 * into a link layer address, and then look that up, bump its 2994 * refcount or allocate an ifma for that also. 2995 * Most link layer resolving functions returns address data which 2996 * fits inside default sockaddr_dl structure. However callback 2997 * can allocate another sockaddr structure, in that case we need to 2998 * free it later. 2999 */ 3000 llsa = NULL; 3001 ll_ifma = NULL; 3002 if (ifp->if_resolvemulti != NULL) { 3003 /* Provide called function with buffer size information */ 3004 sdl.sdl_len = sizeof(sdl); 3005 llsa = (struct sockaddr *)&sdl; 3006 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3007 if (error) 3008 goto unlock_out; 3009 } 3010 3011 /* 3012 * Allocate the new address. Don't hook it up yet, as we may also 3013 * need to allocate a link layer multicast address. 3014 */ 3015 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3016 if (ifma == NULL) { 3017 error = ENOMEM; 3018 goto free_llsa_out; 3019 } 3020 3021 /* 3022 * If a link layer address is found, we'll need to see if it's 3023 * already present in the address list, or allocate is as well. 3024 * When this block finishes, the link layer address will be on the 3025 * list. 3026 */ 3027 if (llsa != NULL) { 3028 ll_ifma = if_findmulti(ifp, llsa); 3029 if (ll_ifma == NULL) { 3030 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3031 if (ll_ifma == NULL) { 3032 --ifma->ifma_refcount; 3033 if_freemulti(ifma); 3034 error = ENOMEM; 3035 goto free_llsa_out; 3036 } 3037 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3038 ifma_link); 3039 } else 3040 ll_ifma->ifma_refcount++; 3041 ifma->ifma_llifma = ll_ifma; 3042 } 3043 3044 /* 3045 * We now have a new multicast address, ifma, and possibly a new or 3046 * referenced link layer address. Add the primary address to the 3047 * ifnet address list. 3048 */ 3049 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3050 3051 if (retifma != NULL) 3052 *retifma = ifma; 3053 3054 /* 3055 * Must generate the message while holding the lock so that 'ifma' 3056 * pointer is still valid. 3057 */ 3058 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3059 IF_ADDR_WUNLOCK(ifp); 3060 3061 /* 3062 * We are certain we have added something, so call down to the 3063 * interface to let them know about it. 3064 */ 3065 if (ifp->if_ioctl != NULL) { 3066 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3067 } 3068 3069 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3070 link_free_sdl(llsa); 3071 3072 return (0); 3073 3074 free_llsa_out: 3075 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3076 link_free_sdl(llsa); 3077 3078 unlock_out: 3079 IF_ADDR_WUNLOCK(ifp); 3080 return (error); 3081 } 3082 3083 /* 3084 * Delete a multicast group membership by network-layer group address. 3085 * 3086 * Returns ENOENT if the entry could not be found. If ifp no longer 3087 * exists, results are undefined. This entry point should only be used 3088 * from subsystems which do appropriate locking to hold ifp for the 3089 * duration of the call. 3090 * Network-layer protocol domains must use if_delmulti_ifma(). 3091 */ 3092 int 3093 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3094 { 3095 struct ifmultiaddr *ifma; 3096 int lastref; 3097 #ifdef INVARIANTS 3098 struct ifnet *oifp; 3099 3100 IFNET_RLOCK_NOSLEEP(); 3101 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3102 if (ifp == oifp) 3103 break; 3104 if (ifp != oifp) 3105 ifp = NULL; 3106 IFNET_RUNLOCK_NOSLEEP(); 3107 3108 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3109 #endif 3110 if (ifp == NULL) 3111 return (ENOENT); 3112 3113 IF_ADDR_WLOCK(ifp); 3114 lastref = 0; 3115 ifma = if_findmulti(ifp, sa); 3116 if (ifma != NULL) 3117 lastref = if_delmulti_locked(ifp, ifma, 0); 3118 IF_ADDR_WUNLOCK(ifp); 3119 3120 if (ifma == NULL) 3121 return (ENOENT); 3122 3123 if (lastref && ifp->if_ioctl != NULL) { 3124 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3125 } 3126 3127 return (0); 3128 } 3129 3130 /* 3131 * Delete all multicast group membership for an interface. 3132 * Should be used to quickly flush all multicast filters. 3133 */ 3134 void 3135 if_delallmulti(struct ifnet *ifp) 3136 { 3137 struct ifmultiaddr *ifma; 3138 struct ifmultiaddr *next; 3139 3140 IF_ADDR_WLOCK(ifp); 3141 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3142 if_delmulti_locked(ifp, ifma, 0); 3143 IF_ADDR_WUNLOCK(ifp); 3144 } 3145 3146 /* 3147 * Delete a multicast group membership by group membership pointer. 3148 * Network-layer protocol domains must use this routine. 3149 * 3150 * It is safe to call this routine if the ifp disappeared. 3151 */ 3152 void 3153 if_delmulti_ifma(struct ifmultiaddr *ifma) 3154 { 3155 struct ifnet *ifp; 3156 int lastref; 3157 3158 ifp = ifma->ifma_ifp; 3159 #ifdef DIAGNOSTIC 3160 if (ifp == NULL) { 3161 printf("%s: ifma_ifp seems to be detached\n", __func__); 3162 } else { 3163 struct ifnet *oifp; 3164 3165 IFNET_RLOCK_NOSLEEP(); 3166 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3167 if (ifp == oifp) 3168 break; 3169 if (ifp != oifp) { 3170 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3171 ifp = NULL; 3172 } 3173 IFNET_RUNLOCK_NOSLEEP(); 3174 } 3175 #endif 3176 /* 3177 * If and only if the ifnet instance exists: Acquire the address lock. 3178 */ 3179 if (ifp != NULL) 3180 IF_ADDR_WLOCK(ifp); 3181 3182 lastref = if_delmulti_locked(ifp, ifma, 0); 3183 3184 if (ifp != NULL) { 3185 /* 3186 * If and only if the ifnet instance exists: 3187 * Release the address lock. 3188 * If the group was left: update the hardware hash filter. 3189 */ 3190 IF_ADDR_WUNLOCK(ifp); 3191 if (lastref && ifp->if_ioctl != NULL) { 3192 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3193 } 3194 } 3195 } 3196 3197 /* 3198 * Perform deletion of network-layer and/or link-layer multicast address. 3199 * 3200 * Return 0 if the reference count was decremented. 3201 * Return 1 if the final reference was released, indicating that the 3202 * hardware hash filter should be reprogrammed. 3203 */ 3204 static int 3205 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3206 { 3207 struct ifmultiaddr *ll_ifma; 3208 3209 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3210 KASSERT(ifma->ifma_ifp == ifp, 3211 ("%s: inconsistent ifp %p", __func__, ifp)); 3212 IF_ADDR_WLOCK_ASSERT(ifp); 3213 } 3214 3215 ifp = ifma->ifma_ifp; 3216 3217 /* 3218 * If the ifnet is detaching, null out references to ifnet, 3219 * so that upper protocol layers will notice, and not attempt 3220 * to obtain locks for an ifnet which no longer exists. The 3221 * routing socket announcement must happen before the ifnet 3222 * instance is detached from the system. 3223 */ 3224 if (detaching) { 3225 #ifdef DIAGNOSTIC 3226 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3227 #endif 3228 /* 3229 * ifp may already be nulled out if we are being reentered 3230 * to delete the ll_ifma. 3231 */ 3232 if (ifp != NULL) { 3233 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3234 ifma->ifma_ifp = NULL; 3235 } 3236 } 3237 3238 if (--ifma->ifma_refcount > 0) 3239 return 0; 3240 3241 /* 3242 * If this ifma is a network-layer ifma, a link-layer ifma may 3243 * have been associated with it. Release it first if so. 3244 */ 3245 ll_ifma = ifma->ifma_llifma; 3246 if (ll_ifma != NULL) { 3247 KASSERT(ifma->ifma_lladdr != NULL, 3248 ("%s: llifma w/o lladdr", __func__)); 3249 if (detaching) 3250 ll_ifma->ifma_ifp = NULL; /* XXX */ 3251 if (--ll_ifma->ifma_refcount == 0) { 3252 if (ifp != NULL) { 3253 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3254 ifma_link); 3255 } 3256 if_freemulti(ll_ifma); 3257 } 3258 } 3259 3260 if (ifp != NULL) 3261 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3262 3263 if_freemulti(ifma); 3264 3265 /* 3266 * The last reference to this instance of struct ifmultiaddr 3267 * was released; the hardware should be notified of this change. 3268 */ 3269 return 1; 3270 } 3271 3272 /* 3273 * Set the link layer address on an interface. 3274 * 3275 * At this time we only support certain types of interfaces, 3276 * and we don't allow the length of the address to change. 3277 */ 3278 int 3279 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3280 { 3281 struct sockaddr_dl *sdl; 3282 struct ifaddr *ifa; 3283 struct ifreq ifr; 3284 3285 IF_ADDR_RLOCK(ifp); 3286 ifa = ifp->if_addr; 3287 if (ifa == NULL) { 3288 IF_ADDR_RUNLOCK(ifp); 3289 return (EINVAL); 3290 } 3291 ifa_ref(ifa); 3292 IF_ADDR_RUNLOCK(ifp); 3293 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3294 if (sdl == NULL) { 3295 ifa_free(ifa); 3296 return (EINVAL); 3297 } 3298 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3299 ifa_free(ifa); 3300 return (EINVAL); 3301 } 3302 switch (ifp->if_type) { 3303 case IFT_ETHER: 3304 case IFT_FDDI: 3305 case IFT_XETHER: 3306 case IFT_ISO88025: 3307 case IFT_L2VLAN: 3308 case IFT_BRIDGE: 3309 case IFT_ARCNET: 3310 case IFT_IEEE8023ADLAG: 3311 case IFT_IEEE80211: 3312 bcopy(lladdr, LLADDR(sdl), len); 3313 ifa_free(ifa); 3314 break; 3315 default: 3316 ifa_free(ifa); 3317 return (ENODEV); 3318 } 3319 3320 /* 3321 * If the interface is already up, we need 3322 * to re-init it in order to reprogram its 3323 * address filter. 3324 */ 3325 if ((ifp->if_flags & IFF_UP) != 0) { 3326 if (ifp->if_ioctl) { 3327 ifp->if_flags &= ~IFF_UP; 3328 ifr.ifr_flags = ifp->if_flags & 0xffff; 3329 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3330 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3331 ifp->if_flags |= IFF_UP; 3332 ifr.ifr_flags = ifp->if_flags & 0xffff; 3333 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3334 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3335 } 3336 #ifdef INET 3337 /* 3338 * Also send gratuitous ARPs to notify other nodes about 3339 * the address change. 3340 */ 3341 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3342 if (ifa->ifa_addr->sa_family == AF_INET) 3343 arp_ifinit(ifp, ifa); 3344 } 3345 #endif 3346 } 3347 return (0); 3348 } 3349 3350 /* 3351 * The name argument must be a pointer to storage which will last as 3352 * long as the interface does. For physical devices, the result of 3353 * device_get_name(dev) is a good choice and for pseudo-devices a 3354 * static string works well. 3355 */ 3356 void 3357 if_initname(struct ifnet *ifp, const char *name, int unit) 3358 { 3359 ifp->if_dname = name; 3360 ifp->if_dunit = unit; 3361 if (unit != IF_DUNIT_NONE) 3362 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3363 else 3364 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3365 } 3366 3367 int 3368 if_printf(struct ifnet *ifp, const char * fmt, ...) 3369 { 3370 va_list ap; 3371 int retval; 3372 3373 retval = printf("%s: ", ifp->if_xname); 3374 va_start(ap, fmt); 3375 retval += vprintf(fmt, ap); 3376 va_end(ap); 3377 return (retval); 3378 } 3379 3380 void 3381 if_start(struct ifnet *ifp) 3382 { 3383 3384 (*(ifp)->if_start)(ifp); 3385 } 3386 3387 /* 3388 * Backwards compatibility interface for drivers 3389 * that have not implemented it 3390 */ 3391 static int 3392 if_transmit(struct ifnet *ifp, struct mbuf *m) 3393 { 3394 int error; 3395 3396 IFQ_HANDOFF(ifp, m, error); 3397 return (error); 3398 } 3399 3400 int 3401 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3402 { 3403 int active = 0; 3404 3405 IF_LOCK(ifq); 3406 if (_IF_QFULL(ifq)) { 3407 _IF_DROP(ifq); 3408 IF_UNLOCK(ifq); 3409 m_freem(m); 3410 return (0); 3411 } 3412 if (ifp != NULL) { 3413 ifp->if_obytes += m->m_pkthdr.len + adjust; 3414 if (m->m_flags & (M_BCAST|M_MCAST)) 3415 ifp->if_omcasts++; 3416 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3417 } 3418 _IF_ENQUEUE(ifq, m); 3419 IF_UNLOCK(ifq); 3420 if (ifp != NULL && !active) 3421 (*(ifp)->if_start)(ifp); 3422 return (1); 3423 } 3424 3425 void 3426 if_register_com_alloc(u_char type, 3427 if_com_alloc_t *a, if_com_free_t *f) 3428 { 3429 3430 KASSERT(if_com_alloc[type] == NULL, 3431 ("if_register_com_alloc: %d already registered", type)); 3432 KASSERT(if_com_free[type] == NULL, 3433 ("if_register_com_alloc: %d free already registered", type)); 3434 3435 if_com_alloc[type] = a; 3436 if_com_free[type] = f; 3437 } 3438 3439 void 3440 if_deregister_com_alloc(u_char type) 3441 { 3442 3443 KASSERT(if_com_alloc[type] != NULL, 3444 ("if_deregister_com_alloc: %d not registered", type)); 3445 KASSERT(if_com_free[type] != NULL, 3446 ("if_deregister_com_alloc: %d free not registered", type)); 3447 if_com_alloc[type] = NULL; 3448 if_com_free[type] = NULL; 3449 } 3450