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