Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/net/if.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD: releng/8.1/sys/net/if.c 209524 2010-06-25 21:26:34Z qingli $ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 #include "opt_carp.h" 37 #include "opt_ddb.h" 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <sys/conf.h> 42 #include <sys/malloc.h> 43 #include <sys/sbuf.h> 44 #include <sys/bus.h> 45 #include <sys/mbuf.h> 46 #include <sys/systm.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/refcount.h> 55 #include <sys/module.h> 56 #include <sys/rwlock.h> 57 #include <sys/sockio.h> 58 #include <sys/syslog.h> 59 #include <sys/sysctl.h> 60 #include <sys/taskqueue.h> 61 #include <sys/domain.h> 62 #include <sys/jail.h> 63 #include <machine/stdarg.h> 64 #include <vm/uma.h> 65 66 #ifdef DDB 67 #include <ddb/ddb.h> 68 #endif 69 70 #include <net/if.h> 71 #include <net/if_arp.h> 72 #include <net/if_clone.h> 73 #include <net/if_dl.h> 74 #include <net/if_types.h> 75 #include <net/if_var.h> 76 #include <net/radix.h> 77 #include <net/route.h> 78 #include <net/vnet.h> 79 80 #if defined(INET) || defined(INET6) 81 /*XXX*/ 82 #include <netinet/in.h> 83 #include <netinet/in_var.h> 84 #ifdef INET6 85 #include <netinet6/in6_var.h> 86 #include <netinet6/in6_ifattach.h> 87 #endif 88 #endif 89 #ifdef INET 90 #include <netinet/if_ether.h> 91 #endif 92 #if defined(INET) || defined(INET6) 93 #ifdef DEV_CARP 94 #include <netinet/ip_carp.h> 95 #endif 96 #endif 97 98 #include <security/mac/mac_framework.h> 99 100 struct ifindex_entry { 101 struct ifnet *ife_ifnet; 102 }; 103 104 static int slowtimo_started; 105 106 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 107 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 108 109 /* Log link state change events */ 110 static int log_link_state_change = 1; 111 112 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 113 &log_link_state_change, 0, 114 "log interface link state change events"); 115 116 /* Interface description */ 117 static unsigned int ifdescr_maxlen = 1024; 118 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 119 &ifdescr_maxlen, 0, 120 "administrative maximum length for interface description"); 121 122 MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 123 124 /* global sx for non-critical path ifdescr */ 125 static struct sx ifdescr_sx; 126 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 127 128 void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 129 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 130 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 131 132 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 133 134 /* 135 * XXX: Style; these should be sorted alphabetically, and unprototyped 136 * static functions should be prototyped. Currently they are sorted by 137 * declaration order. 138 */ 139 static void if_attachdomain(void *); 140 static void if_attachdomain1(struct ifnet *); 141 static int ifconf(u_long, caddr_t); 142 static void if_freemulti(struct ifmultiaddr *); 143 static void if_init(void *); 144 static void if_grow(void); 145 static void if_check(void *); 146 static void if_route(struct ifnet *, int flag, int fam); 147 static int if_setflag(struct ifnet *, int, int, int *, int); 148 static void if_slowtimo(void *); 149 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 150 static void if_unroute(struct ifnet *, int flag, int fam); 151 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 152 static int if_rtdel(struct radix_node *, void *); 153 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 154 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 155 static void do_link_state_change(void *, int); 156 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 157 static int if_getgroupmembers(struct ifgroupreq *); 158 static void if_delgroups(struct ifnet *); 159 static void if_attach_internal(struct ifnet *, int); 160 static void if_detach_internal(struct ifnet *, int); 161 162 #ifdef INET6 163 /* 164 * XXX: declare here to avoid to include many inet6 related files.. 165 * should be more generalized? 166 */ 167 extern void nd6_setmtu(struct ifnet *); 168 #endif 169 170 VNET_DEFINE(int, if_index); 171 int ifqmaxlen = IFQ_MAXLEN; 172 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 173 VNET_DEFINE(struct ifgrouphead, ifg_head); 174 175 static VNET_DEFINE(int, if_indexlim) = 8; 176 177 /* Table of ifnet by index. */ 178 static VNET_DEFINE(struct ifindex_entry *, ifindex_table); 179 180 #define V_if_indexlim VNET(if_indexlim) 181 #define V_ifindex_table VNET(ifindex_table) 182 183 /* 184 * The global network interface list (V_ifnet) and related state (such as 185 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 186 * an rwlock. Either may be acquired shared to stablize the list, but both 187 * must be acquired writable to modify the list. This model allows us to 188 * both stablize the interface list during interrupt thread processing, but 189 * also to stablize it over long-running ioctls, without introducing priority 190 * inversions and deadlocks. 191 */ 192 struct rwlock ifnet_rwlock; 193 struct sx ifnet_sxlock; 194 195 /* 196 * The allocation of network interfaces is a rather non-atomic affair; we 197 * need to select an index before we are ready to expose the interface for 198 * use, so will use this pointer value to indicate reservation. 199 */ 200 #define IFNET_HOLD (void *)(uintptr_t)(-1) 201 202 static if_com_alloc_t *if_com_alloc[256]; 203 static if_com_free_t *if_com_free[256]; 204 205 /* 206 * System initialization 207 */ 208 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL); 209 210 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 211 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 212 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 213 214 struct ifnet * 215 ifnet_byindex_locked(u_short idx) 216 { 217 218 if (idx > V_if_index) 219 return (NULL); 220 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 221 return (NULL); 222 return (V_ifindex_table[idx].ife_ifnet); 223 } 224 225 struct ifnet * 226 ifnet_byindex(u_short idx) 227 { 228 struct ifnet *ifp; 229 230 IFNET_RLOCK_NOSLEEP(); 231 ifp = ifnet_byindex_locked(idx); 232 IFNET_RUNLOCK_NOSLEEP(); 233 return (ifp); 234 } 235 236 struct ifnet * 237 ifnet_byindex_ref(u_short idx) 238 { 239 struct ifnet *ifp; 240 241 IFNET_RLOCK_NOSLEEP(); 242 ifp = ifnet_byindex_locked(idx); 243 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 244 IFNET_RUNLOCK_NOSLEEP(); 245 return (NULL); 246 } 247 if_ref(ifp); 248 IFNET_RUNLOCK_NOSLEEP(); 249 return (ifp); 250 } 251 252 /* 253 * Allocate an ifindex array entry; return 0 on success or an error on 254 * failure. 255 */ 256 static int 257 ifindex_alloc_locked(u_short *idxp) 258 { 259 u_short idx; 260 261 IFNET_WLOCK_ASSERT(); 262 263 /* 264 * Try to find an empty slot below V_if_index. If we fail, take the 265 * next slot. 266 */ 267 for (idx = 1; idx <= V_if_index; idx++) { 268 if (V_ifindex_table[idx].ife_ifnet == NULL) 269 break; 270 } 271 272 /* Catch if_index overflow. */ 273 if (idx < 1) 274 return (ENOSPC); 275 if (idx > V_if_index) 276 V_if_index = idx; 277 if (V_if_index >= V_if_indexlim) 278 if_grow(); 279 *idxp = idx; 280 return (0); 281 } 282 283 static void 284 ifindex_free_locked(u_short idx) 285 { 286 287 IFNET_WLOCK_ASSERT(); 288 289 V_ifindex_table[idx].ife_ifnet = NULL; 290 while (V_if_index > 0 && 291 V_ifindex_table[V_if_index].ife_ifnet == NULL) 292 V_if_index--; 293 } 294 295 static void 296 ifindex_free(u_short idx) 297 { 298 299 IFNET_WLOCK(); 300 ifindex_free_locked(idx); 301 IFNET_WUNLOCK(); 302 } 303 304 static void 305 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 306 { 307 308 IFNET_WLOCK_ASSERT(); 309 310 V_ifindex_table[idx].ife_ifnet = ifp; 311 } 312 313 static void 314 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 315 { 316 317 IFNET_WLOCK(); 318 ifnet_setbyindex_locked(idx, ifp); 319 IFNET_WUNLOCK(); 320 } 321 322 struct ifaddr * 323 ifaddr_byindex(u_short idx) 324 { 325 struct ifaddr *ifa; 326 327 IFNET_RLOCK_NOSLEEP(); 328 ifa = ifnet_byindex_locked(idx)->if_addr; 329 if (ifa != NULL) 330 ifa_ref(ifa); 331 IFNET_RUNLOCK_NOSLEEP(); 332 return (ifa); 333 } 334 335 /* 336 * Network interface utility routines. 337 * 338 * Routines with ifa_ifwith* names take sockaddr *'s as 339 * parameters. 340 */ 341 342 static void 343 vnet_if_init(const void *unused __unused) 344 { 345 346 TAILQ_INIT(&V_ifnet); 347 TAILQ_INIT(&V_ifg_head); 348 if_grow(); /* create initial table */ 349 vnet_if_clone_init(); 350 } 351 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_FIRST, vnet_if_init, 352 NULL); 353 354 /* ARGSUSED*/ 355 static void 356 if_init(void *dummy __unused) 357 { 358 359 IFNET_LOCK_INIT(); 360 if_clone_init(); 361 } 362 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_SECOND, if_init, NULL); 363 364 365 #ifdef VIMAGE 366 static void 367 vnet_if_uninit(const void *unused __unused) 368 { 369 370 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet)); 371 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head)); 372 373 free((caddr_t)V_ifindex_table, M_IFNET); 374 } 375 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 376 vnet_if_uninit, NULL); 377 #endif 378 379 static void 380 if_grow(void) 381 { 382 u_int n; 383 struct ifindex_entry *e; 384 385 V_if_indexlim <<= 1; 386 n = V_if_indexlim * sizeof(*e); 387 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 388 if (V_ifindex_table != NULL) { 389 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 390 free((caddr_t)V_ifindex_table, M_IFNET); 391 } 392 V_ifindex_table = e; 393 } 394 395 static void 396 if_check(void *dummy __unused) 397 { 398 399 /* 400 * If at least one interface added during boot uses 401 * if_watchdog then start the timer. 402 */ 403 if (slowtimo_started) 404 if_slowtimo(0); 405 } 406 407 /* 408 * Allocate a struct ifnet and an index for an interface. A layer 2 409 * common structure will also be allocated if an allocation routine is 410 * registered for the passed type. 411 */ 412 struct ifnet * 413 if_alloc(u_char type) 414 { 415 struct ifnet *ifp; 416 u_short idx; 417 418 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 419 IFNET_WLOCK(); 420 if (ifindex_alloc_locked(&idx) != 0) { 421 IFNET_WUNLOCK(); 422 free(ifp, M_IFNET); 423 return (NULL); 424 } 425 ifnet_setbyindex_locked(idx, IFNET_HOLD); 426 IFNET_WUNLOCK(); 427 ifp->if_index = idx; 428 ifp->if_type = type; 429 ifp->if_alloctype = type; 430 if (if_com_alloc[type] != NULL) { 431 ifp->if_l2com = if_com_alloc[type](type, ifp); 432 if (ifp->if_l2com == NULL) { 433 free(ifp, M_IFNET); 434 ifindex_free(idx); 435 return (NULL); 436 } 437 } 438 439 IF_ADDR_LOCK_INIT(ifp); 440 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 441 ifp->if_afdata_initialized = 0; 442 IF_AFDATA_LOCK_INIT(ifp); 443 TAILQ_INIT(&ifp->if_addrhead); 444 TAILQ_INIT(&ifp->if_prefixhead); 445 TAILQ_INIT(&ifp->if_multiaddrs); 446 TAILQ_INIT(&ifp->if_groups); 447 #ifdef MAC 448 mac_ifnet_init(ifp); 449 #endif 450 ifq_init(&ifp->if_snd, ifp); 451 452 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 453 ifnet_setbyindex(ifp->if_index, ifp); 454 return (ifp); 455 } 456 457 /* 458 * Do the actual work of freeing a struct ifnet, associated index, and layer 459 * 2 common structure. This call is made when the last reference to an 460 * interface is released. 461 */ 462 static void 463 if_free_internal(struct ifnet *ifp) 464 { 465 466 KASSERT((ifp->if_flags & IFF_DYING), 467 ("if_free_internal: interface not dying")); 468 469 IFNET_WLOCK(); 470 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 471 ("%s: freeing unallocated ifnet", ifp->if_xname)); 472 473 ifindex_free_locked(ifp->if_index); 474 IFNET_WUNLOCK(); 475 476 if (if_com_free[ifp->if_alloctype] != NULL) 477 if_com_free[ifp->if_alloctype](ifp->if_l2com, 478 ifp->if_alloctype); 479 480 #ifdef MAC 481 mac_ifnet_destroy(ifp); 482 #endif /* MAC */ 483 if (ifp->if_description != NULL) 484 free(ifp->if_description, M_IFDESCR); 485 IF_AFDATA_DESTROY(ifp); 486 IF_ADDR_LOCK_DESTROY(ifp); 487 ifq_delete(&ifp->if_snd); 488 free(ifp, M_IFNET); 489 } 490 491 /* 492 * This version should only be called by intefaces that switch their type 493 * after calling if_alloc(). if_free_type() will go away again now that we 494 * have if_alloctype to cache the original allocation type. For now, assert 495 * that they match, since we require that in practice. 496 */ 497 void 498 if_free_type(struct ifnet *ifp, u_char type) 499 { 500 501 KASSERT(ifp->if_alloctype == type, 502 ("if_free_type: type (%d) != alloctype (%d)", type, 503 ifp->if_alloctype)); 504 505 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 506 if (!refcount_release(&ifp->if_refcount)) 507 return; 508 if_free_internal(ifp); 509 } 510 511 /* 512 * This is the normal version of if_free(), used by device drivers to free a 513 * detached network interface. The contents of if_free_type() will move into 514 * here when if_free_type() goes away. 515 */ 516 void 517 if_free(struct ifnet *ifp) 518 { 519 520 if_free_type(ifp, ifp->if_alloctype); 521 } 522 523 /* 524 * Interfaces to keep an ifnet type-stable despite the possibility of the 525 * driver calling if_free(). If there are additional references, we defer 526 * freeing the underlying data structure. 527 */ 528 void 529 if_ref(struct ifnet *ifp) 530 { 531 532 /* We don't assert the ifnet list lock here, but arguably should. */ 533 refcount_acquire(&ifp->if_refcount); 534 } 535 536 void 537 if_rele(struct ifnet *ifp) 538 { 539 540 if (!refcount_release(&ifp->if_refcount)) 541 return; 542 if_free_internal(ifp); 543 } 544 545 void 546 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 547 { 548 549 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 550 551 if (ifq->ifq_maxlen == 0) 552 ifq->ifq_maxlen = ifqmaxlen; 553 554 ifq->altq_type = 0; 555 ifq->altq_disc = NULL; 556 ifq->altq_flags &= ALTQF_CANTCHANGE; 557 ifq->altq_tbr = NULL; 558 ifq->altq_ifp = ifp; 559 } 560 561 void 562 ifq_delete(struct ifaltq *ifq) 563 { 564 mtx_destroy(&ifq->ifq_mtx); 565 } 566 567 /* 568 * Perform generic interface initalization tasks and attach the interface 569 * to the list of "active" interfaces. If vmove flag is set on entry 570 * to if_attach_internal(), perform only a limited subset of initialization 571 * tasks, given that we are moving from one vnet to another an ifnet which 572 * has already been fully initialized. 573 * 574 * XXX: 575 * - The decision to return void and thus require this function to 576 * succeed is questionable. 577 * - We should probably do more sanity checking. For instance we don't 578 * do anything to insure if_xname is unique or non-empty. 579 */ 580 void 581 if_attach(struct ifnet *ifp) 582 { 583 584 if_attach_internal(ifp, 0); 585 } 586 587 static void 588 if_attach_internal(struct ifnet *ifp, int vmove) 589 { 590 unsigned socksize, ifasize; 591 int namelen, masklen; 592 struct sockaddr_dl *sdl; 593 struct ifaddr *ifa; 594 595 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 596 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 597 ifp->if_xname); 598 599 #ifdef VIMAGE 600 ifp->if_vnet = curvnet; 601 if (ifp->if_home_vnet == NULL) 602 ifp->if_home_vnet = curvnet; 603 #endif 604 605 if_addgroup(ifp, IFG_ALL); 606 607 getmicrotime(&ifp->if_lastchange); 608 ifp->if_data.ifi_epoch = time_uptime; 609 ifp->if_data.ifi_datalen = sizeof(struct if_data); 610 611 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 612 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 613 ("transmit and qflush must both either be set or both be NULL")); 614 if (ifp->if_transmit == NULL) { 615 ifp->if_transmit = if_transmit; 616 ifp->if_qflush = if_qflush; 617 } 618 619 if (!vmove) { 620 #ifdef MAC 621 mac_ifnet_create(ifp); 622 #endif 623 624 /* 625 * Create a Link Level name for this device. 626 */ 627 namelen = strlen(ifp->if_xname); 628 /* 629 * Always save enough space for any possiable name so we 630 * can do a rename in place later. 631 */ 632 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 633 socksize = masklen + ifp->if_addrlen; 634 if (socksize < sizeof(*sdl)) 635 socksize = sizeof(*sdl); 636 socksize = roundup2(socksize, sizeof(long)); 637 ifasize = sizeof(*ifa) + 2 * socksize; 638 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 639 ifa_init(ifa); 640 sdl = (struct sockaddr_dl *)(ifa + 1); 641 sdl->sdl_len = socksize; 642 sdl->sdl_family = AF_LINK; 643 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 644 sdl->sdl_nlen = namelen; 645 sdl->sdl_index = ifp->if_index; 646 sdl->sdl_type = ifp->if_type; 647 ifp->if_addr = ifa; 648 ifa->ifa_ifp = ifp; 649 ifa->ifa_rtrequest = link_rtrequest; 650 ifa->ifa_addr = (struct sockaddr *)sdl; 651 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 652 ifa->ifa_netmask = (struct sockaddr *)sdl; 653 sdl->sdl_len = masklen; 654 while (namelen != 0) 655 sdl->sdl_data[--namelen] = 0xff; 656 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 657 /* Reliably crash if used uninitialized. */ 658 ifp->if_broadcastaddr = NULL; 659 } 660 #ifdef VIMAGE 661 else { 662 /* 663 * Update the interface index in the link layer address 664 * of the interface. 665 */ 666 for (ifa = ifp->if_addr; ifa != NULL; 667 ifa = TAILQ_NEXT(ifa, ifa_link)) { 668 if (ifa->ifa_addr->sa_family == AF_LINK) { 669 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 670 sdl->sdl_index = ifp->if_index; 671 } 672 } 673 } 674 #endif 675 676 IFNET_WLOCK(); 677 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 678 #ifdef VIMAGE 679 curvnet->vnet_ifcnt++; 680 #endif 681 IFNET_WUNLOCK(); 682 683 if (domain_init_status >= 2) 684 if_attachdomain1(ifp); 685 686 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 687 if (IS_DEFAULT_VNET(curvnet)) 688 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 689 690 /* Announce the interface. */ 691 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 692 693 if (!vmove && ifp->if_watchdog != NULL) { 694 if_printf(ifp, 695 "WARNING: using obsoleted if_watchdog interface\n"); 696 697 /* 698 * Note that we need if_slowtimo(). If this happens after 699 * boot, then call if_slowtimo() directly. 700 */ 701 if (atomic_cmpset_int(&slowtimo_started, 0, 1) && !cold) 702 if_slowtimo(0); 703 } 704 } 705 706 static void 707 if_attachdomain(void *dummy) 708 { 709 struct ifnet *ifp; 710 int s; 711 712 s = splnet(); 713 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 714 if_attachdomain1(ifp); 715 splx(s); 716 } 717 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 718 if_attachdomain, NULL); 719 720 static void 721 if_attachdomain1(struct ifnet *ifp) 722 { 723 struct domain *dp; 724 int s; 725 726 s = splnet(); 727 728 /* 729 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 730 * cannot lock ifp->if_afdata initialization, entirely. 731 */ 732 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 733 splx(s); 734 return; 735 } 736 if (ifp->if_afdata_initialized >= domain_init_status) { 737 IF_AFDATA_UNLOCK(ifp); 738 splx(s); 739 printf("if_attachdomain called more than once on %s\n", 740 ifp->if_xname); 741 return; 742 } 743 ifp->if_afdata_initialized = domain_init_status; 744 IF_AFDATA_UNLOCK(ifp); 745 746 /* address family dependent data region */ 747 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 748 for (dp = domains; dp; dp = dp->dom_next) { 749 if (dp->dom_ifattach) 750 ifp->if_afdata[dp->dom_family] = 751 (*dp->dom_ifattach)(ifp); 752 } 753 754 splx(s); 755 } 756 757 /* 758 * Remove any unicast or broadcast network addresses from an interface. 759 */ 760 void 761 if_purgeaddrs(struct ifnet *ifp) 762 { 763 struct ifaddr *ifa, *next; 764 765 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 766 if (ifa->ifa_addr->sa_family == AF_LINK) 767 continue; 768 #ifdef INET 769 /* XXX: Ugly!! ad hoc just for INET */ 770 if (ifa->ifa_addr->sa_family == AF_INET) { 771 struct ifaliasreq ifr; 772 773 bzero(&ifr, sizeof(ifr)); 774 ifr.ifra_addr = *ifa->ifa_addr; 775 if (ifa->ifa_dstaddr) 776 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 777 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 778 NULL) == 0) 779 continue; 780 } 781 #endif /* INET */ 782 #ifdef INET6 783 if (ifa->ifa_addr->sa_family == AF_INET6) { 784 in6_purgeaddr(ifa); 785 /* ifp_addrhead is already updated */ 786 continue; 787 } 788 #endif /* INET6 */ 789 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 790 ifa_free(ifa); 791 } 792 } 793 794 /* 795 * Remove any multicast network addresses from an interface when an ifnet 796 * is going away. 797 */ 798 static void 799 if_purgemaddrs(struct ifnet *ifp) 800 { 801 struct ifmultiaddr *ifma; 802 struct ifmultiaddr *next; 803 804 IF_ADDR_LOCK(ifp); 805 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 806 if_delmulti_locked(ifp, ifma, 1); 807 IF_ADDR_UNLOCK(ifp); 808 } 809 810 /* 811 * Detach an interface, removing it from the list of "active" interfaces. 812 * If vmove flag is set on entry to if_detach_internal(), perform only a 813 * limited subset of cleanup tasks, given that we are moving an ifnet from 814 * one vnet to another, where it must be fully operational. 815 * 816 * XXXRW: There are some significant questions about event ordering, and 817 * how to prevent things from starting to use the interface during detach. 818 */ 819 void 820 if_detach(struct ifnet *ifp) 821 { 822 823 if_detach_internal(ifp, 0); 824 } 825 826 static void 827 if_detach_internal(struct ifnet *ifp, int vmove) 828 { 829 struct ifaddr *ifa; 830 struct radix_node_head *rnh; 831 int i, j; 832 struct domain *dp; 833 struct ifnet *iter; 834 int found = 0; 835 836 IFNET_WLOCK(); 837 TAILQ_FOREACH(iter, &V_ifnet, if_link) 838 if (iter == ifp) { 839 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 840 found = 1; 841 break; 842 } 843 #ifdef VIMAGE 844 if (found) 845 curvnet->vnet_ifcnt--; 846 #endif 847 IFNET_WUNLOCK(); 848 if (!found) { 849 if (vmove) 850 panic("%s: ifp=%p not on the ifnet tailq %p", 851 __func__, ifp, &V_ifnet); 852 else 853 return; /* XXX this should panic as well? */ 854 } 855 856 /* 857 * Remove/wait for pending events. 858 */ 859 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 860 861 /* 862 * Remove routes and flush queues. 863 */ 864 if_down(ifp); 865 #ifdef ALTQ 866 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 867 altq_disable(&ifp->if_snd); 868 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 869 altq_detach(&ifp->if_snd); 870 #endif 871 872 if_purgeaddrs(ifp); 873 874 #ifdef INET 875 in_ifdetach(ifp); 876 #endif 877 878 #ifdef INET6 879 /* 880 * Remove all IPv6 kernel structs related to ifp. This should be done 881 * before removing routing entries below, since IPv6 interface direct 882 * routes are expected to be removed by the IPv6-specific kernel API. 883 * Otherwise, the kernel will detect some inconsistency and bark it. 884 */ 885 in6_ifdetach(ifp); 886 #endif 887 if_purgemaddrs(ifp); 888 889 if (!vmove) { 890 /* 891 * Prevent further calls into the device driver via ifnet. 892 */ 893 if_dead(ifp); 894 895 /* 896 * Remove link ifaddr pointer and maybe decrement if_index. 897 * Clean up all addresses. 898 */ 899 ifp->if_addr = NULL; 900 901 /* We can now free link ifaddr. */ 902 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 903 ifa = TAILQ_FIRST(&ifp->if_addrhead); 904 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 905 ifa_free(ifa); 906 } 907 } 908 909 /* 910 * Delete all remaining routes using this interface 911 * Unfortuneatly the only way to do this is to slog through 912 * the entire routing table looking for routes which point 913 * to this interface...oh well... 914 */ 915 for (i = 1; i <= AF_MAX; i++) { 916 for (j = 0; j < rt_numfibs; j++) { 917 rnh = rt_tables_get_rnh(j, i); 918 if (rnh == NULL) 919 continue; 920 RADIX_NODE_HEAD_LOCK(rnh); 921 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 922 RADIX_NODE_HEAD_UNLOCK(rnh); 923 } 924 } 925 926 /* Announce that the interface is gone. */ 927 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 928 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 929 if (IS_DEFAULT_VNET(curvnet)) 930 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 931 if_delgroups(ifp); 932 933 /* 934 * We cannot hold the lock over dom_ifdetach calls as they might 935 * sleep, for example trying to drain a callout, thus open up the 936 * theoretical race with re-attaching. 937 */ 938 IF_AFDATA_LOCK(ifp); 939 i = ifp->if_afdata_initialized; 940 ifp->if_afdata_initialized = 0; 941 IF_AFDATA_UNLOCK(ifp); 942 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 943 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 944 (*dp->dom_ifdetach)(ifp, 945 ifp->if_afdata[dp->dom_family]); 946 } 947 } 948 949 #ifdef VIMAGE 950 /* 951 * if_vmove() performs a limited version of if_detach() in current 952 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 953 * An attempt is made to shrink if_index in current vnet, find an 954 * unused if_index in target vnet and calls if_grow() if necessary, 955 * and finally find an unused if_xname for the target vnet. 956 */ 957 void 958 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 959 { 960 u_short idx; 961 962 /* 963 * Detach from current vnet, but preserve LLADDR info, do not 964 * mark as dead etc. so that the ifnet can be reattached later. 965 */ 966 if_detach_internal(ifp, 1); 967 968 /* 969 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 970 * the if_index for that vnet if possible. 971 * 972 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 973 * or we'd lock on one vnet and unlock on another. 974 */ 975 IFNET_WLOCK(); 976 ifindex_free_locked(ifp->if_index); 977 978 /* 979 * Switch to the context of the target vnet. 980 */ 981 CURVNET_SET_QUIET(new_vnet); 982 983 if (ifindex_alloc_locked(&idx) != 0) { 984 IFNET_WUNLOCK(); 985 panic("if_index overflow"); 986 } 987 ifp->if_index = idx; 988 ifnet_setbyindex_locked(ifp->if_index, ifp); 989 IFNET_WUNLOCK(); 990 991 if_attach_internal(ifp, 1); 992 993 CURVNET_RESTORE(); 994 } 995 996 /* 997 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 998 */ 999 static int 1000 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1001 { 1002 struct prison *pr; 1003 struct ifnet *difp; 1004 1005 /* Try to find the prison within our visibility. */ 1006 sx_slock(&allprison_lock); 1007 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1008 sx_sunlock(&allprison_lock); 1009 if (pr == NULL) 1010 return (ENXIO); 1011 prison_hold_locked(pr); 1012 mtx_unlock(&pr->pr_mtx); 1013 1014 /* Do not try to move the iface from and to the same prison. */ 1015 if (pr->pr_vnet == ifp->if_vnet) { 1016 prison_free(pr); 1017 return (EEXIST); 1018 } 1019 1020 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1021 /* XXX Lock interfaces to avoid races. */ 1022 CURVNET_SET_QUIET(pr->pr_vnet); 1023 difp = ifunit(ifname); 1024 CURVNET_RESTORE(); 1025 if (difp != NULL) { 1026 prison_free(pr); 1027 return (EEXIST); 1028 } 1029 1030 /* Move the interface into the child jail/vnet. */ 1031 if_vmove(ifp, pr->pr_vnet); 1032 1033 /* Report the new if_xname back to the userland. */ 1034 sprintf(ifname, "%s", ifp->if_xname); 1035 1036 prison_free(pr); 1037 return (0); 1038 } 1039 1040 static int 1041 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1042 { 1043 struct prison *pr; 1044 struct vnet *vnet_dst; 1045 struct ifnet *ifp; 1046 1047 /* Try to find the prison within our visibility. */ 1048 sx_slock(&allprison_lock); 1049 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1050 sx_sunlock(&allprison_lock); 1051 if (pr == NULL) 1052 return (ENXIO); 1053 prison_hold_locked(pr); 1054 mtx_unlock(&pr->pr_mtx); 1055 1056 /* Make sure the named iface exists in the source prison/vnet. */ 1057 CURVNET_SET(pr->pr_vnet); 1058 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1059 if (ifp == NULL) { 1060 CURVNET_RESTORE(); 1061 prison_free(pr); 1062 return (ENXIO); 1063 } 1064 1065 /* Do not try to move the iface from and to the same prison. */ 1066 vnet_dst = TD_TO_VNET(td); 1067 if (vnet_dst == ifp->if_vnet) { 1068 CURVNET_RESTORE(); 1069 prison_free(pr); 1070 return (EEXIST); 1071 } 1072 1073 /* Get interface back from child jail/vnet. */ 1074 if_vmove(ifp, vnet_dst); 1075 CURVNET_RESTORE(); 1076 1077 /* Report the new if_xname back to the userland. */ 1078 sprintf(ifname, "%s", ifp->if_xname); 1079 1080 prison_free(pr); 1081 return (0); 1082 } 1083 #endif /* VIMAGE */ 1084 1085 /* 1086 * Add a group to an interface 1087 */ 1088 int 1089 if_addgroup(struct ifnet *ifp, const char *groupname) 1090 { 1091 struct ifg_list *ifgl; 1092 struct ifg_group *ifg = NULL; 1093 struct ifg_member *ifgm; 1094 1095 if (groupname[0] && groupname[strlen(groupname) - 1] >= '' && 1096 groupname[strlen(groupname) - 1] <= '9') 1097 return (EINVAL); 1098 1099 IFNET_WLOCK(); 1100 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1101 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1102 IFNET_WUNLOCK(); 1103 return (EEXIST); 1104 } 1105 1106 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1107 M_NOWAIT)) == NULL) { 1108 IFNET_WUNLOCK(); 1109 return (ENOMEM); 1110 } 1111 1112 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1113 M_TEMP, M_NOWAIT)) == NULL) { 1114 free(ifgl, M_TEMP); 1115 IFNET_WUNLOCK(); 1116 return (ENOMEM); 1117 } 1118 1119 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1120 if (!strcmp(ifg->ifg_group, groupname)) 1121 break; 1122 1123 if (ifg == NULL) { 1124 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1125 M_TEMP, M_NOWAIT)) == NULL) { 1126 free(ifgl, M_TEMP); 1127 free(ifgm, M_TEMP); 1128 IFNET_WUNLOCK(); 1129 return (ENOMEM); 1130 } 1131 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1132 ifg->ifg_refcnt = 0; 1133 TAILQ_INIT(&ifg->ifg_members); 1134 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1135 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1136 } 1137 1138 ifg->ifg_refcnt++; 1139 ifgl->ifgl_group = ifg; 1140 ifgm->ifgm_ifp = ifp; 1141 1142 IF_ADDR_LOCK(ifp); 1143 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1144 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1145 IF_ADDR_UNLOCK(ifp); 1146 1147 IFNET_WUNLOCK(); 1148 1149 EVENTHANDLER_INVOKE(group_change_event, groupname); 1150 1151 return (0); 1152 } 1153 1154 /* 1155 * Remove a group from an interface 1156 */ 1157 int 1158 if_delgroup(struct ifnet *ifp, const char *groupname) 1159 { 1160 struct ifg_list *ifgl; 1161 struct ifg_member *ifgm; 1162 1163 IFNET_WLOCK(); 1164 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1165 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1166 break; 1167 if (ifgl == NULL) { 1168 IFNET_WUNLOCK(); 1169 return (ENOENT); 1170 } 1171 1172 IF_ADDR_LOCK(ifp); 1173 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1174 IF_ADDR_UNLOCK(ifp); 1175 1176 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1177 if (ifgm->ifgm_ifp == ifp) 1178 break; 1179 1180 if (ifgm != NULL) { 1181 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1182 free(ifgm, M_TEMP); 1183 } 1184 1185 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1186 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1187 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1188 free(ifgl->ifgl_group, M_TEMP); 1189 } 1190 IFNET_WUNLOCK(); 1191 1192 free(ifgl, M_TEMP); 1193 1194 EVENTHANDLER_INVOKE(group_change_event, groupname); 1195 1196 return (0); 1197 } 1198 1199 /* 1200 * Remove an interface from all groups 1201 */ 1202 static void 1203 if_delgroups(struct ifnet *ifp) 1204 { 1205 struct ifg_list *ifgl; 1206 struct ifg_member *ifgm; 1207 char groupname[IFNAMSIZ]; 1208 1209 IFNET_WLOCK(); 1210 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1211 ifgl = TAILQ_FIRST(&ifp->if_groups); 1212 1213 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1214 1215 IF_ADDR_LOCK(ifp); 1216 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1217 IF_ADDR_UNLOCK(ifp); 1218 1219 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1220 if (ifgm->ifgm_ifp == ifp) 1221 break; 1222 1223 if (ifgm != NULL) { 1224 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1225 ifgm_next); 1226 free(ifgm, M_TEMP); 1227 } 1228 1229 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1230 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1231 EVENTHANDLER_INVOKE(group_detach_event, 1232 ifgl->ifgl_group); 1233 free(ifgl->ifgl_group, M_TEMP); 1234 } 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_LOCK(ifp); 1260 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1261 ifgr->ifgr_len += sizeof(struct ifg_req); 1262 IF_ADDR_UNLOCK(ifp); 1263 return (0); 1264 } 1265 1266 len = ifgr->ifgr_len; 1267 ifgp = ifgr->ifgr_groups; 1268 /* XXX: wire */ 1269 IF_ADDR_LOCK(ifp); 1270 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1271 if (len < sizeof(ifgrq)) { 1272 IF_ADDR_UNLOCK(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_UNLOCK(ifp); 1280 return (error); 1281 } 1282 len -= sizeof(ifgrq); 1283 ifgp++; 1284 } 1285 IF_ADDR_UNLOCK(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), rt->rt_flags|RTF_RNH_LOCKED, 1373 (struct rtentry **) NULL, rt->rt_fibnum); 1374 if (err) { 1375 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1376 } 1377 } 1378 1379 return (0); 1380 } 1381 1382 /* 1383 * Wrapper functions for struct ifnet address list locking macros. These are 1384 * used by kernel modules to avoid encoding programming interface or binary 1385 * interface assumptions that may be violated when kernel-internal locking 1386 * approaches change. 1387 */ 1388 void 1389 if_addr_rlock(struct ifnet *ifp) 1390 { 1391 1392 IF_ADDR_LOCK(ifp); 1393 } 1394 1395 void 1396 if_addr_runlock(struct ifnet *ifp) 1397 { 1398 1399 IF_ADDR_UNLOCK(ifp); 1400 } 1401 1402 void 1403 if_maddr_rlock(struct ifnet *ifp) 1404 { 1405 1406 IF_ADDR_LOCK(ifp); 1407 } 1408 1409 void 1410 if_maddr_runlock(struct ifnet *ifp) 1411 { 1412 1413 IF_ADDR_UNLOCK(ifp); 1414 } 1415 1416 /* 1417 * Reference count functions for ifaddrs. 1418 */ 1419 void 1420 ifa_init(struct ifaddr *ifa) 1421 { 1422 1423 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1424 refcount_init(&ifa->ifa_refcnt, 1); 1425 } 1426 1427 void 1428 ifa_ref(struct ifaddr *ifa) 1429 { 1430 1431 refcount_acquire(&ifa->ifa_refcnt); 1432 } 1433 1434 void 1435 ifa_free(struct ifaddr *ifa) 1436 { 1437 1438 if (refcount_release(&ifa->ifa_refcnt)) { 1439 mtx_destroy(&ifa->ifa_mtx); 1440 free(ifa, M_IFADDR); 1441 } 1442 } 1443 1444 int 1445 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1446 { 1447 int error = 0; 1448 struct rtentry *rt = NULL; 1449 struct rt_addrinfo info; 1450 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1451 1452 bzero(&info, sizeof(info)); 1453 info.rti_ifp = V_loif; 1454 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1455 info.rti_info[RTAX_DST] = ia; 1456 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1457 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1458 1459 if (error == 0 && rt != NULL) { 1460 RT_LOCK(rt); 1461 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1462 ifa->ifa_ifp->if_type; 1463 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1464 ifa->ifa_ifp->if_index; 1465 RT_REMREF(rt); 1466 RT_UNLOCK(rt); 1467 } else if (error != 0) 1468 log(LOG_INFO, "ifa_add_loopback_route: insertion failed\n"); 1469 1470 return (error); 1471 } 1472 1473 int 1474 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1475 { 1476 int error = 0; 1477 struct rt_addrinfo info; 1478 struct sockaddr_dl null_sdl; 1479 1480 bzero(&null_sdl, sizeof(null_sdl)); 1481 null_sdl.sdl_len = sizeof(null_sdl); 1482 null_sdl.sdl_family = AF_LINK; 1483 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1484 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1485 bzero(&info, sizeof(info)); 1486 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1487 info.rti_info[RTAX_DST] = ia; 1488 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1489 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1490 1491 if (error != 0) 1492 log(LOG_INFO, "ifa_del_loopback_route: deletion failed\n"); 1493 1494 return (error); 1495 } 1496 1497 /* 1498 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1499 * structs used to represent other address families, it is necessary 1500 * to perform a different comparison. 1501 */ 1502 1503 #define sa_equal(a1, a2) \ 1504 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1505 1506 #define sa_dl_equal(a1, a2) \ 1507 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1508 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1509 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1510 LLADDR((struct sockaddr_dl *)(a2)), \ 1511 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1512 1513 /* 1514 * Locate an interface based on a complete address. 1515 */ 1516 /*ARGSUSED*/ 1517 static struct ifaddr * 1518 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1519 { 1520 struct ifnet *ifp; 1521 struct ifaddr *ifa; 1522 1523 IFNET_RLOCK_NOSLEEP(); 1524 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1525 IF_ADDR_LOCK(ifp); 1526 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1527 if (ifa->ifa_addr->sa_family != addr->sa_family) 1528 continue; 1529 if (sa_equal(addr, ifa->ifa_addr)) { 1530 if (getref) 1531 ifa_ref(ifa); 1532 IF_ADDR_UNLOCK(ifp); 1533 goto done; 1534 } 1535 /* IP6 doesn't have broadcast */ 1536 if ((ifp->if_flags & IFF_BROADCAST) && 1537 ifa->ifa_broadaddr && 1538 ifa->ifa_broadaddr->sa_len != 0 && 1539 sa_equal(ifa->ifa_broadaddr, addr)) { 1540 if (getref) 1541 ifa_ref(ifa); 1542 IF_ADDR_UNLOCK(ifp); 1543 goto done; 1544 } 1545 } 1546 IF_ADDR_UNLOCK(ifp); 1547 } 1548 ifa = NULL; 1549 done: 1550 IFNET_RUNLOCK_NOSLEEP(); 1551 return (ifa); 1552 } 1553 1554 struct ifaddr * 1555 ifa_ifwithaddr(struct sockaddr *addr) 1556 { 1557 1558 return (ifa_ifwithaddr_internal(addr, 1)); 1559 } 1560 1561 int 1562 ifa_ifwithaddr_check(struct sockaddr *addr) 1563 { 1564 1565 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1566 } 1567 1568 /* 1569 * Locate an interface based on the broadcast address. 1570 */ 1571 /* ARGSUSED */ 1572 struct ifaddr * 1573 ifa_ifwithbroadaddr(struct sockaddr *addr) 1574 { 1575 struct ifnet *ifp; 1576 struct ifaddr *ifa; 1577 1578 IFNET_RLOCK_NOSLEEP(); 1579 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1580 IF_ADDR_LOCK(ifp); 1581 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1582 if (ifa->ifa_addr->sa_family != addr->sa_family) 1583 continue; 1584 if ((ifp->if_flags & IFF_BROADCAST) && 1585 ifa->ifa_broadaddr && 1586 ifa->ifa_broadaddr->sa_len != 0 && 1587 sa_equal(ifa->ifa_broadaddr, addr)) { 1588 ifa_ref(ifa); 1589 IF_ADDR_UNLOCK(ifp); 1590 goto done; 1591 } 1592 } 1593 IF_ADDR_UNLOCK(ifp); 1594 } 1595 ifa = NULL; 1596 done: 1597 IFNET_RUNLOCK_NOSLEEP(); 1598 return (ifa); 1599 } 1600 1601 /* 1602 * Locate the point to point interface with a given destination address. 1603 */ 1604 /*ARGSUSED*/ 1605 struct ifaddr * 1606 ifa_ifwithdstaddr(struct sockaddr *addr) 1607 { 1608 struct ifnet *ifp; 1609 struct ifaddr *ifa; 1610 1611 IFNET_RLOCK_NOSLEEP(); 1612 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1613 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1614 continue; 1615 IF_ADDR_LOCK(ifp); 1616 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1617 if (ifa->ifa_addr->sa_family != addr->sa_family) 1618 continue; 1619 if (ifa->ifa_dstaddr != NULL && 1620 sa_equal(addr, ifa->ifa_dstaddr)) { 1621 ifa_ref(ifa); 1622 IF_ADDR_UNLOCK(ifp); 1623 goto done; 1624 } 1625 } 1626 IF_ADDR_UNLOCK(ifp); 1627 } 1628 ifa = NULL; 1629 done: 1630 IFNET_RUNLOCK_NOSLEEP(); 1631 return (ifa); 1632 } 1633 1634 /* 1635 * Find an interface on a specific network. If many, choice 1636 * is most specific found. 1637 */ 1638 struct ifaddr * 1639 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1640 { 1641 struct ifnet *ifp; 1642 struct ifaddr *ifa; 1643 struct ifaddr *ifa_maybe = NULL; 1644 u_int af = addr->sa_family; 1645 char *addr_data = addr->sa_data, *cplim; 1646 1647 /* 1648 * AF_LINK addresses can be looked up directly by their index number, 1649 * so do that if we can. 1650 */ 1651 if (af == AF_LINK) { 1652 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1653 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1654 return (ifaddr_byindex(sdl->sdl_index)); 1655 } 1656 1657 /* 1658 * Scan though each interface, looking for ones that have addresses 1659 * in this address family. Maintain a reference on ifa_maybe once 1660 * we find one, as we release the IF_ADDR_LOCK() that kept it stable 1661 * when we move onto the next interface. 1662 */ 1663 IFNET_RLOCK_NOSLEEP(); 1664 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1665 IF_ADDR_LOCK(ifp); 1666 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1667 char *cp, *cp2, *cp3; 1668 1669 if (ifa->ifa_addr->sa_family != af) 1670 next: continue; 1671 if (af == AF_INET && 1672 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1673 /* 1674 * This is a bit broken as it doesn't 1675 * take into account that the remote end may 1676 * be a single node in the network we are 1677 * looking for. 1678 * The trouble is that we don't know the 1679 * netmask for the remote end. 1680 */ 1681 if (ifa->ifa_dstaddr != NULL && 1682 sa_equal(addr, ifa->ifa_dstaddr)) { 1683 ifa_ref(ifa); 1684 IF_ADDR_UNLOCK(ifp); 1685 goto done; 1686 } 1687 } else { 1688 /* 1689 * if we have a special address handler, 1690 * then use it instead of the generic one. 1691 */ 1692 if (ifa->ifa_claim_addr) { 1693 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1694 ifa_ref(ifa); 1695 IF_ADDR_UNLOCK(ifp); 1696 goto done; 1697 } 1698 continue; 1699 } 1700 1701 /* 1702 * Scan all the bits in the ifa's address. 1703 * If a bit dissagrees with what we are 1704 * looking for, mask it with the netmask 1705 * to see if it really matters. 1706 * (A byte at a time) 1707 */ 1708 if (ifa->ifa_netmask == 0) 1709 continue; 1710 cp = addr_data; 1711 cp2 = ifa->ifa_addr->sa_data; 1712 cp3 = ifa->ifa_netmask->sa_data; 1713 cplim = ifa->ifa_netmask->sa_len 1714 + (char *)ifa->ifa_netmask; 1715 while (cp3 < cplim) 1716 if ((*cp++ ^ *cp2++) & *cp3++) 1717 goto next; /* next address! */ 1718 /* 1719 * If the netmask of what we just found 1720 * is more specific than what we had before 1721 * (if we had one) then remember the new one 1722 * before continuing to search 1723 * for an even better one. 1724 */ 1725 if (ifa_maybe == NULL || 1726 rn_refines((caddr_t)ifa->ifa_netmask, 1727 (caddr_t)ifa_maybe->ifa_netmask)) { 1728 if (ifa_maybe != NULL) 1729 ifa_free(ifa_maybe); 1730 ifa_maybe = ifa; 1731 ifa_ref(ifa_maybe); 1732 } 1733 } 1734 } 1735 IF_ADDR_UNLOCK(ifp); 1736 } 1737 ifa = ifa_maybe; 1738 ifa_maybe = NULL; 1739 done: 1740 IFNET_RUNLOCK_NOSLEEP(); 1741 if (ifa_maybe != NULL) 1742 ifa_free(ifa_maybe); 1743 return (ifa); 1744 } 1745 1746 /* 1747 * Find an interface address specific to an interface best matching 1748 * a given address. 1749 */ 1750 struct ifaddr * 1751 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1752 { 1753 struct ifaddr *ifa; 1754 char *cp, *cp2, *cp3; 1755 char *cplim; 1756 struct ifaddr *ifa_maybe = NULL; 1757 u_int af = addr->sa_family; 1758 1759 if (af >= AF_MAX) 1760 return (0); 1761 IF_ADDR_LOCK(ifp); 1762 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1763 if (ifa->ifa_addr->sa_family != af) 1764 continue; 1765 if (ifa_maybe == NULL) 1766 ifa_maybe = ifa; 1767 if (ifa->ifa_netmask == 0) { 1768 if (sa_equal(addr, ifa->ifa_addr) || 1769 (ifa->ifa_dstaddr && 1770 sa_equal(addr, ifa->ifa_dstaddr))) 1771 goto done; 1772 continue; 1773 } 1774 if (ifp->if_flags & IFF_POINTOPOINT) { 1775 if (sa_equal(addr, ifa->ifa_dstaddr)) 1776 goto done; 1777 } else { 1778 cp = addr->sa_data; 1779 cp2 = ifa->ifa_addr->sa_data; 1780 cp3 = ifa->ifa_netmask->sa_data; 1781 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1782 for (; cp3 < cplim; cp3++) 1783 if ((*cp++ ^ *cp2++) & *cp3) 1784 break; 1785 if (cp3 == cplim) 1786 goto done; 1787 } 1788 } 1789 ifa = ifa_maybe; 1790 done: 1791 if (ifa != NULL) 1792 ifa_ref(ifa); 1793 IF_ADDR_UNLOCK(ifp); 1794 return (ifa); 1795 } 1796 1797 #include <net/if_llatbl.h> 1798 1799 /* 1800 * Default action when installing a route with a Link Level gateway. 1801 * Lookup an appropriate real ifa to point to. 1802 * This should be moved to /sys/net/link.c eventually. 1803 */ 1804 static void 1805 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1806 { 1807 struct ifaddr *ifa, *oifa; 1808 struct sockaddr *dst; 1809 struct ifnet *ifp; 1810 1811 RT_LOCK_ASSERT(rt); 1812 1813 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1814 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1815 return; 1816 ifa = ifaof_ifpforaddr(dst, ifp); 1817 if (ifa) { 1818 oifa = rt->rt_ifa; 1819 rt->rt_ifa = ifa; 1820 ifa_free(oifa); 1821 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1822 ifa->ifa_rtrequest(cmd, rt, info); 1823 } 1824 } 1825 1826 /* 1827 * Mark an interface down and notify protocols of 1828 * the transition. 1829 * NOTE: must be called at splnet or eqivalent. 1830 */ 1831 static void 1832 if_unroute(struct ifnet *ifp, int flag, int fam) 1833 { 1834 struct ifaddr *ifa; 1835 1836 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1837 1838 ifp->if_flags &= ~flag; 1839 getmicrotime(&ifp->if_lastchange); 1840 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1841 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1842 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1843 ifp->if_qflush(ifp); 1844 1845 #if defined(INET) || defined(INET6) 1846 #ifdef DEV_CARP 1847 if (ifp->if_carp) 1848 carp_carpdev_state(ifp->if_carp); 1849 #endif 1850 #endif 1851 rt_ifmsg(ifp); 1852 } 1853 1854 /* 1855 * Mark an interface up and notify protocols of 1856 * the transition. 1857 * NOTE: must be called at splnet or eqivalent. 1858 */ 1859 static void 1860 if_route(struct ifnet *ifp, int flag, int fam) 1861 { 1862 struct ifaddr *ifa; 1863 1864 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1865 1866 ifp->if_flags |= flag; 1867 getmicrotime(&ifp->if_lastchange); 1868 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1869 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1870 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1871 #if defined(INET) || defined(INET6) 1872 #ifdef DEV_CARP 1873 if (ifp->if_carp) 1874 carp_carpdev_state(ifp->if_carp); 1875 #endif 1876 #endif 1877 rt_ifmsg(ifp); 1878 #ifdef INET6 1879 in6_if_up(ifp); 1880 #endif 1881 } 1882 1883 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1884 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1885 1886 /* 1887 * Handle a change in the interface link state. To avoid LORs 1888 * between driver lock and upper layer locks, as well as possible 1889 * recursions, we post event to taskqueue, and all job 1890 * is done in static do_link_state_change(). 1891 */ 1892 void 1893 if_link_state_change(struct ifnet *ifp, int link_state) 1894 { 1895 /* Return if state hasn't changed. */ 1896 if (ifp->if_link_state == link_state) 1897 return; 1898 1899 ifp->if_link_state = link_state; 1900 1901 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1902 } 1903 1904 static void 1905 do_link_state_change(void *arg, int pending) 1906 { 1907 struct ifnet *ifp = (struct ifnet *)arg; 1908 int link_state = ifp->if_link_state; 1909 CURVNET_SET(ifp->if_vnet); 1910 1911 /* Notify that the link state has changed. */ 1912 rt_ifmsg(ifp); 1913 if (ifp->if_vlantrunk != NULL) 1914 (*vlan_link_state_p)(ifp, 0); 1915 1916 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1917 IFP2AC(ifp)->ac_netgraph != NULL) 1918 (*ng_ether_link_state_p)(ifp, link_state); 1919 #if defined(INET) || defined(INET6) 1920 #ifdef DEV_CARP 1921 if (ifp->if_carp) 1922 carp_carpdev_state(ifp->if_carp); 1923 #endif 1924 #endif 1925 if (ifp->if_bridge) { 1926 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1927 (*bstp_linkstate_p)(ifp, link_state); 1928 } 1929 if (ifp->if_lagg) { 1930 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1931 (*lagg_linkstate_p)(ifp, link_state); 1932 } 1933 1934 if (IS_DEFAULT_VNET(curvnet)) 1935 devctl_notify("IFNET", ifp->if_xname, 1936 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1937 NULL); 1938 if (pending > 1) 1939 if_printf(ifp, "%d link states coalesced\n", pending); 1940 if (log_link_state_change) 1941 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1942 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1943 CURVNET_RESTORE(); 1944 } 1945 1946 /* 1947 * Mark an interface down and notify protocols of 1948 * the transition. 1949 * NOTE: must be called at splnet or eqivalent. 1950 */ 1951 void 1952 if_down(struct ifnet *ifp) 1953 { 1954 1955 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1956 } 1957 1958 /* 1959 * Mark an interface up and notify protocols of 1960 * the transition. 1961 * NOTE: must be called at splnet or eqivalent. 1962 */ 1963 void 1964 if_up(struct ifnet *ifp) 1965 { 1966 1967 if_route(ifp, IFF_UP, AF_UNSPEC); 1968 } 1969 1970 /* 1971 * Flush an interface queue. 1972 */ 1973 void 1974 if_qflush(struct ifnet *ifp) 1975 { 1976 struct mbuf *m, *n; 1977 struct ifaltq *ifq; 1978 1979 ifq = &ifp->if_snd; 1980 IFQ_LOCK(ifq); 1981 #ifdef ALTQ 1982 if (ALTQ_IS_ENABLED(ifq)) 1983 ALTQ_PURGE(ifq); 1984 #endif 1985 n = ifq->ifq_head; 1986 while ((m = n) != 0) { 1987 n = m->m_act; 1988 m_freem(m); 1989 } 1990 ifq->ifq_head = 0; 1991 ifq->ifq_tail = 0; 1992 ifq->ifq_len = 0; 1993 IFQ_UNLOCK(ifq); 1994 } 1995 1996 /* 1997 * Handle interface watchdog timer routines. Called 1998 * from softclock, we decrement timers (if set) and 1999 * call the appropriate interface routine on expiration. 2000 * 2001 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 2002 * holding Giant. 2003 */ 2004 static void 2005 if_slowtimo(void *arg) 2006 { 2007 VNET_ITERATOR_DECL(vnet_iter); 2008 struct ifnet *ifp; 2009 int s = splimp(); 2010 2011 VNET_LIST_RLOCK_NOSLEEP(); 2012 IFNET_RLOCK_NOSLEEP(); 2013 VNET_FOREACH(vnet_iter) { 2014 CURVNET_SET(vnet_iter); 2015 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2016 if (ifp->if_timer == 0 || --ifp->if_timer) 2017 continue; 2018 if (ifp->if_watchdog) 2019 (*ifp->if_watchdog)(ifp); 2020 } 2021 CURVNET_RESTORE(); 2022 } 2023 IFNET_RUNLOCK_NOSLEEP(); 2024 VNET_LIST_RUNLOCK_NOSLEEP(); 2025 splx(s); 2026 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 2027 } 2028 2029 /* 2030 * Map interface name to interface structure pointer, with or without 2031 * returning a reference. 2032 */ 2033 struct ifnet * 2034 ifunit_ref(const char *name) 2035 { 2036 struct ifnet *ifp; 2037 2038 IFNET_RLOCK_NOSLEEP(); 2039 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2040 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2041 !(ifp->if_flags & IFF_DYING)) 2042 break; 2043 } 2044 if (ifp != NULL) 2045 if_ref(ifp); 2046 IFNET_RUNLOCK_NOSLEEP(); 2047 return (ifp); 2048 } 2049 2050 struct ifnet * 2051 ifunit(const char *name) 2052 { 2053 struct ifnet *ifp; 2054 2055 IFNET_RLOCK_NOSLEEP(); 2056 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2057 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2058 break; 2059 } 2060 IFNET_RUNLOCK_NOSLEEP(); 2061 return (ifp); 2062 } 2063 2064 /* 2065 * Hardware specific interface ioctls. 2066 */ 2067 static int 2068 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2069 { 2070 struct ifreq *ifr; 2071 struct ifstat *ifs; 2072 int error = 0; 2073 int new_flags, temp_flags; 2074 size_t namelen, onamelen; 2075 size_t descrlen; 2076 char *descrbuf, *odescrbuf; 2077 char new_name[IFNAMSIZ]; 2078 struct ifaddr *ifa; 2079 struct sockaddr_dl *sdl; 2080 2081 ifr = (struct ifreq *)data; 2082 switch (cmd) { 2083 case SIOCGIFINDEX: 2084 ifr->ifr_index = ifp->if_index; 2085 break; 2086 2087 case SIOCGIFFLAGS: 2088 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2089 ifr->ifr_flags = temp_flags & 0xffff; 2090 ifr->ifr_flagshigh = temp_flags >> 16; 2091 break; 2092 2093 case SIOCGIFCAP: 2094 ifr->ifr_reqcap = ifp->if_capabilities; 2095 ifr->ifr_curcap = ifp->if_capenable; 2096 break; 2097 2098 #ifdef MAC 2099 case SIOCGIFMAC: 2100 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2101 break; 2102 #endif 2103 2104 case SIOCGIFMETRIC: 2105 ifr->ifr_metric = ifp->if_metric; 2106 break; 2107 2108 case SIOCGIFMTU: 2109 ifr->ifr_mtu = ifp->if_mtu; 2110 break; 2111 2112 case SIOCGIFPHYS: 2113 ifr->ifr_phys = ifp->if_physical; 2114 break; 2115 2116 case SIOCGIFDESCR: 2117 error = 0; 2118 sx_slock(&ifdescr_sx); 2119 if (ifp->if_description == NULL) 2120 error = ENOMSG; 2121 else { 2122 /* space for terminating nul */ 2123 descrlen = strlen(ifp->if_description) + 1; 2124 if (ifr->ifr_buffer.length < descrlen) 2125 ifr->ifr_buffer.buffer = NULL; 2126 else 2127 error = copyout(ifp->if_description, 2128 ifr->ifr_buffer.buffer, descrlen); 2129 ifr->ifr_buffer.length = descrlen; 2130 } 2131 sx_sunlock(&ifdescr_sx); 2132 break; 2133 2134 case SIOCSIFDESCR: 2135 error = priv_check(td, PRIV_NET_SETIFDESCR); 2136 if (error) 2137 return (error); 2138 2139 /* 2140 * Copy only (length-1) bytes to make sure that 2141 * if_description is always nul terminated. The 2142 * length parameter is supposed to count the 2143 * terminating nul in. 2144 */ 2145 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2146 return (ENAMETOOLONG); 2147 else if (ifr->ifr_buffer.length == 0) 2148 descrbuf = NULL; 2149 else { 2150 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2151 M_WAITOK | M_ZERO); 2152 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2153 ifr->ifr_buffer.length - 1); 2154 if (error) { 2155 free(descrbuf, M_IFDESCR); 2156 break; 2157 } 2158 } 2159 2160 sx_xlock(&ifdescr_sx); 2161 odescrbuf = ifp->if_description; 2162 ifp->if_description = descrbuf; 2163 sx_xunlock(&ifdescr_sx); 2164 2165 getmicrotime(&ifp->if_lastchange); 2166 free(odescrbuf, M_IFDESCR); 2167 break; 2168 2169 case SIOCSIFFLAGS: 2170 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2171 if (error) 2172 return (error); 2173 /* 2174 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2175 * check, so we don't need special handling here yet. 2176 */ 2177 new_flags = (ifr->ifr_flags & 0xffff) | 2178 (ifr->ifr_flagshigh << 16); 2179 if (ifp->if_flags & IFF_SMART) { 2180 /* Smart drivers twiddle their own routes */ 2181 } else if (ifp->if_flags & IFF_UP && 2182 (new_flags & IFF_UP) == 0) { 2183 int s = splimp(); 2184 if_down(ifp); 2185 splx(s); 2186 } else if (new_flags & IFF_UP && 2187 (ifp->if_flags & IFF_UP) == 0) { 2188 int s = splimp(); 2189 if_up(ifp); 2190 splx(s); 2191 } 2192 /* See if permanently promiscuous mode bit is about to flip */ 2193 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2194 if (new_flags & IFF_PPROMISC) 2195 ifp->if_flags |= IFF_PROMISC; 2196 else if (ifp->if_pcount == 0) 2197 ifp->if_flags &= ~IFF_PROMISC; 2198 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2199 ifp->if_xname, 2200 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2201 } 2202 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2203 (new_flags &~ IFF_CANTCHANGE); 2204 if (ifp->if_ioctl) { 2205 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2206 } 2207 getmicrotime(&ifp->if_lastchange); 2208 break; 2209 2210 case SIOCSIFCAP: 2211 error = priv_check(td, PRIV_NET_SETIFCAP); 2212 if (error) 2213 return (error); 2214 if (ifp->if_ioctl == NULL) 2215 return (EOPNOTSUPP); 2216 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2217 return (EINVAL); 2218 error = (*ifp->if_ioctl)(ifp, cmd, data); 2219 if (error == 0) 2220 getmicrotime(&ifp->if_lastchange); 2221 break; 2222 2223 #ifdef MAC 2224 case SIOCSIFMAC: 2225 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2226 break; 2227 #endif 2228 2229 case SIOCSIFNAME: 2230 error = priv_check(td, PRIV_NET_SETIFNAME); 2231 if (error) 2232 return (error); 2233 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2234 if (error != 0) 2235 return (error); 2236 if (new_name[0] == '\0') 2237 return (EINVAL); 2238 if (ifunit(new_name) != NULL) 2239 return (EEXIST); 2240 2241 /* 2242 * XXX: Locking. Nothing else seems to lock if_flags, 2243 * and there are numerous other races with the 2244 * ifunit() checks not being atomic with namespace 2245 * changes (renames, vmoves, if_attach, etc). 2246 */ 2247 ifp->if_flags |= IFF_RENAMING; 2248 2249 /* Announce the departure of the interface. */ 2250 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2251 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2252 2253 log(LOG_INFO, "%s: changing name to '%s'\n", 2254 ifp->if_xname, new_name); 2255 2256 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2257 ifa = ifp->if_addr; 2258 IFA_LOCK(ifa); 2259 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2260 namelen = strlen(new_name); 2261 onamelen = sdl->sdl_nlen; 2262 /* 2263 * Move the address if needed. This is safe because we 2264 * allocate space for a name of length IFNAMSIZ when we 2265 * create this in if_attach(). 2266 */ 2267 if (namelen != onamelen) { 2268 bcopy(sdl->sdl_data + onamelen, 2269 sdl->sdl_data + namelen, sdl->sdl_alen); 2270 } 2271 bcopy(new_name, sdl->sdl_data, namelen); 2272 sdl->sdl_nlen = namelen; 2273 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2274 bzero(sdl->sdl_data, onamelen); 2275 while (namelen != 0) 2276 sdl->sdl_data[--namelen] = 0xff; 2277 IFA_UNLOCK(ifa); 2278 2279 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2280 /* Announce the return of the interface. */ 2281 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2282 2283 ifp->if_flags &= ~IFF_RENAMING; 2284 break; 2285 2286 #ifdef VIMAGE 2287 case SIOCSIFVNET: 2288 error = priv_check(td, PRIV_NET_SETIFVNET); 2289 if (error) 2290 return (error); 2291 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2292 break; 2293 #endif 2294 2295 case SIOCSIFMETRIC: 2296 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2297 if (error) 2298 return (error); 2299 ifp->if_metric = ifr->ifr_metric; 2300 getmicrotime(&ifp->if_lastchange); 2301 break; 2302 2303 case SIOCSIFPHYS: 2304 error = priv_check(td, PRIV_NET_SETIFPHYS); 2305 if (error) 2306 return (error); 2307 if (ifp->if_ioctl == NULL) 2308 return (EOPNOTSUPP); 2309 error = (*ifp->if_ioctl)(ifp, cmd, data); 2310 if (error == 0) 2311 getmicrotime(&ifp->if_lastchange); 2312 break; 2313 2314 case SIOCSIFMTU: 2315 { 2316 u_long oldmtu = ifp->if_mtu; 2317 2318 error = priv_check(td, PRIV_NET_SETIFMTU); 2319 if (error) 2320 return (error); 2321 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2322 return (EINVAL); 2323 if (ifp->if_ioctl == NULL) 2324 return (EOPNOTSUPP); 2325 error = (*ifp->if_ioctl)(ifp, cmd, data); 2326 if (error == 0) { 2327 getmicrotime(&ifp->if_lastchange); 2328 rt_ifmsg(ifp); 2329 } 2330 /* 2331 * If the link MTU changed, do network layer specific procedure. 2332 */ 2333 if (ifp->if_mtu != oldmtu) { 2334 #ifdef INET6 2335 nd6_setmtu(ifp); 2336 #endif 2337 } 2338 break; 2339 } 2340 2341 case SIOCADDMULTI: 2342 case SIOCDELMULTI: 2343 if (cmd == SIOCADDMULTI) 2344 error = priv_check(td, PRIV_NET_ADDMULTI); 2345 else 2346 error = priv_check(td, PRIV_NET_DELMULTI); 2347 if (error) 2348 return (error); 2349 2350 /* Don't allow group membership on non-multicast interfaces. */ 2351 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2352 return (EOPNOTSUPP); 2353 2354 /* Don't let users screw up protocols' entries. */ 2355 if (ifr->ifr_addr.sa_family != AF_LINK) 2356 return (EINVAL); 2357 2358 if (cmd == SIOCADDMULTI) { 2359 struct ifmultiaddr *ifma; 2360 2361 /* 2362 * Userland is only permitted to join groups once 2363 * via the if_addmulti() KPI, because it cannot hold 2364 * struct ifmultiaddr * between calls. It may also 2365 * lose a race while we check if the membership 2366 * already exists. 2367 */ 2368 IF_ADDR_LOCK(ifp); 2369 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2370 IF_ADDR_UNLOCK(ifp); 2371 if (ifma != NULL) 2372 error = EADDRINUSE; 2373 else 2374 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2375 } else { 2376 error = if_delmulti(ifp, &ifr->ifr_addr); 2377 } 2378 if (error == 0) 2379 getmicrotime(&ifp->if_lastchange); 2380 break; 2381 2382 case SIOCSIFPHYADDR: 2383 case SIOCDIFPHYADDR: 2384 #ifdef INET6 2385 case SIOCSIFPHYADDR_IN6: 2386 #endif 2387 case SIOCSLIFPHYADDR: 2388 case SIOCSIFMEDIA: 2389 case SIOCSIFGENERIC: 2390 error = priv_check(td, PRIV_NET_HWIOCTL); 2391 if (error) 2392 return (error); 2393 if (ifp->if_ioctl == NULL) 2394 return (EOPNOTSUPP); 2395 error = (*ifp->if_ioctl)(ifp, cmd, data); 2396 if (error == 0) 2397 getmicrotime(&ifp->if_lastchange); 2398 break; 2399 2400 case SIOCGIFSTATUS: 2401 ifs = (struct ifstat *)data; 2402 ifs->ascii[0] = '\0'; 2403 2404 case SIOCGIFPSRCADDR: 2405 case SIOCGIFPDSTADDR: 2406 case SIOCGLIFPHYADDR: 2407 case SIOCGIFMEDIA: 2408 case SIOCGIFGENERIC: 2409 if (ifp->if_ioctl == NULL) 2410 return (EOPNOTSUPP); 2411 error = (*ifp->if_ioctl)(ifp, cmd, data); 2412 break; 2413 2414 case SIOCSIFLLADDR: 2415 error = priv_check(td, PRIV_NET_SETLLADDR); 2416 if (error) 2417 return (error); 2418 error = if_setlladdr(ifp, 2419 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2420 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2421 break; 2422 2423 case SIOCAIFGROUP: 2424 { 2425 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2426 2427 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2428 if (error) 2429 return (error); 2430 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2431 return (error); 2432 break; 2433 } 2434 2435 case SIOCGIFGROUP: 2436 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2437 return (error); 2438 break; 2439 2440 case SIOCDIFGROUP: 2441 { 2442 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2443 2444 error = priv_check(td, PRIV_NET_DELIFGROUP); 2445 if (error) 2446 return (error); 2447 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2448 return (error); 2449 break; 2450 } 2451 2452 default: 2453 error = ENOIOCTL; 2454 break; 2455 } 2456 return (error); 2457 } 2458 2459 /* 2460 * Interface ioctls. 2461 */ 2462 int 2463 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2464 { 2465 struct ifnet *ifp; 2466 struct ifreq *ifr; 2467 int error; 2468 int oif_flags; 2469 2470 switch (cmd) { 2471 case SIOCGIFCONF: 2472 case OSIOCGIFCONF: 2473 #ifdef __amd64__ 2474 case SIOCGIFCONF32: 2475 #endif 2476 return (ifconf(cmd, data)); 2477 } 2478 ifr = (struct ifreq *)data; 2479 2480 switch (cmd) { 2481 #ifdef VIMAGE 2482 case SIOCSIFRVNET: 2483 error = priv_check(td, PRIV_NET_SETIFVNET); 2484 if (error) 2485 return (error); 2486 return (if_vmove_reclaim(td, ifr->ifr_name, ifr->ifr_jid)); 2487 #endif 2488 case SIOCIFCREATE: 2489 case SIOCIFCREATE2: 2490 error = priv_check(td, PRIV_NET_IFCREATE); 2491 if (error) 2492 return (error); 2493 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 2494 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 2495 case SIOCIFDESTROY: 2496 error = priv_check(td, PRIV_NET_IFDESTROY); 2497 if (error) 2498 return (error); 2499 return if_clone_destroy(ifr->ifr_name); 2500 2501 case SIOCIFGCLONERS: 2502 return (if_clone_list((struct if_clonereq *)data)); 2503 case SIOCGIFGMEMB: 2504 return (if_getgroupmembers((struct ifgroupreq *)data)); 2505 } 2506 2507 ifp = ifunit_ref(ifr->ifr_name); 2508 if (ifp == NULL) 2509 return (ENXIO); 2510 2511 error = ifhwioctl(cmd, ifp, data, td); 2512 if (error != ENOIOCTL) { 2513 if_rele(ifp); 2514 return (error); 2515 } 2516 2517 oif_flags = ifp->if_flags; 2518 if (so->so_proto == NULL) { 2519 if_rele(ifp); 2520 return (EOPNOTSUPP); 2521 } 2522 #ifndef COMPAT_43 2523 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2524 data, 2525 ifp, td)); 2526 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2527 error = (*ifp->if_ioctl)(ifp, cmd, data); 2528 #else 2529 { 2530 u_long ocmd = cmd; 2531 2532 switch (cmd) { 2533 2534 case SIOCSIFDSTADDR: 2535 case SIOCSIFADDR: 2536 case SIOCSIFBRDADDR: 2537 case SIOCSIFNETMASK: 2538 #if BYTE_ORDER != BIG_ENDIAN 2539 if (ifr->ifr_addr.sa_family == 0 && 2540 ifr->ifr_addr.sa_len < 16) { 2541 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2542 ifr->ifr_addr.sa_len = 16; 2543 } 2544 #else 2545 if (ifr->ifr_addr.sa_len == 0) 2546 ifr->ifr_addr.sa_len = 16; 2547 #endif 2548 break; 2549 2550 case OSIOCGIFADDR: 2551 cmd = SIOCGIFADDR; 2552 break; 2553 2554 case OSIOCGIFDSTADDR: 2555 cmd = SIOCGIFDSTADDR; 2556 break; 2557 2558 case OSIOCGIFBRDADDR: 2559 cmd = SIOCGIFBRDADDR; 2560 break; 2561 2562 case OSIOCGIFNETMASK: 2563 cmd = SIOCGIFNETMASK; 2564 } 2565 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2566 cmd, 2567 data, 2568 ifp, td)); 2569 if (error == EOPNOTSUPP && ifp != NULL && 2570 ifp->if_ioctl != NULL) 2571 error = (*ifp->if_ioctl)(ifp, cmd, data); 2572 switch (ocmd) { 2573 2574 case OSIOCGIFADDR: 2575 case OSIOCGIFDSTADDR: 2576 case OSIOCGIFBRDADDR: 2577 case OSIOCGIFNETMASK: 2578 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2579 2580 } 2581 } 2582 #endif /* COMPAT_43 */ 2583 2584 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2585 #ifdef INET6 2586 if (ifp->if_flags & IFF_UP) { 2587 int s = splimp(); 2588 in6_if_up(ifp); 2589 splx(s); 2590 } 2591 #endif 2592 } 2593 if_rele(ifp); 2594 return (error); 2595 } 2596 2597 /* 2598 * The code common to handling reference counted flags, 2599 * e.g., in ifpromisc() and if_allmulti(). 2600 * The "pflag" argument can specify a permanent mode flag to check, 2601 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2602 * 2603 * Only to be used on stack-owned flags, not driver-owned flags. 2604 */ 2605 static int 2606 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2607 { 2608 struct ifreq ifr; 2609 int error; 2610 int oldflags, oldcount; 2611 2612 /* Sanity checks to catch programming errors */ 2613 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2614 ("%s: setting driver-owned flag %d", __func__, flag)); 2615 2616 if (onswitch) 2617 KASSERT(*refcount >= 0, 2618 ("%s: increment negative refcount %d for flag %d", 2619 __func__, *refcount, flag)); 2620 else 2621 KASSERT(*refcount > 0, 2622 ("%s: decrement non-positive refcount %d for flag %d", 2623 __func__, *refcount, flag)); 2624 2625 /* In case this mode is permanent, just touch refcount */ 2626 if (ifp->if_flags & pflag) { 2627 *refcount += onswitch ? 1 : -1; 2628 return (0); 2629 } 2630 2631 /* Save ifnet parameters for if_ioctl() may fail */ 2632 oldcount = *refcount; 2633 oldflags = ifp->if_flags; 2634 2635 /* 2636 * See if we aren't the only and touching refcount is enough. 2637 * Actually toggle interface flag if we are the first or last. 2638 */ 2639 if (onswitch) { 2640 if ((*refcount)++) 2641 return (0); 2642 ifp->if_flags |= flag; 2643 } else { 2644 if (--(*refcount)) 2645 return (0); 2646 ifp->if_flags &= ~flag; 2647 } 2648 2649 /* Call down the driver since we've changed interface flags */ 2650 if (ifp->if_ioctl == NULL) { 2651 error = EOPNOTSUPP; 2652 goto recover; 2653 } 2654 ifr.ifr_flags = ifp->if_flags & 0xffff; 2655 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2656 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2657 if (error) 2658 goto recover; 2659 /* Notify userland that interface flags have changed */ 2660 rt_ifmsg(ifp); 2661 return (0); 2662 2663 recover: 2664 /* Recover after driver error */ 2665 *refcount = oldcount; 2666 ifp->if_flags = oldflags; 2667 return (error); 2668 } 2669 2670 /* 2671 * Set/clear promiscuous mode on interface ifp based on the truth value 2672 * of pswitch. The calls are reference counted so that only the first 2673 * "on" request actually has an effect, as does the final "off" request. 2674 * Results are undefined if the "off" and "on" requests are not matched. 2675 */ 2676 int 2677 ifpromisc(struct ifnet *ifp, int pswitch) 2678 { 2679 int error; 2680 int oldflags = ifp->if_flags; 2681 2682 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2683 &ifp->if_pcount, pswitch); 2684 /* If promiscuous mode status has changed, log a message */ 2685 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2686 log(LOG_INFO, "%s: promiscuous mode %s\n", 2687 ifp->if_xname, 2688 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2689 return (error); 2690 } 2691 2692 /* 2693 * Return interface configuration 2694 * of system. List may be used 2695 * in later ioctl's (above) to get 2696 * other information. 2697 */ 2698 /*ARGSUSED*/ 2699 static int 2700 ifconf(u_long cmd, caddr_t data) 2701 { 2702 struct ifconf *ifc = (struct ifconf *)data; 2703 #ifdef __amd64__ 2704 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 2705 struct ifconf ifc_swab; 2706 #endif 2707 struct ifnet *ifp; 2708 struct ifaddr *ifa; 2709 struct ifreq ifr; 2710 struct sbuf *sb; 2711 int error, full = 0, valid_len, max_len; 2712 2713 #ifdef __amd64__ 2714 if (cmd == SIOCGIFCONF32) { 2715 ifc_swab.ifc_len = ifc32->ifc_len; 2716 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 2717 ifc = &ifc_swab; 2718 } 2719 #endif 2720 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2721 max_len = MAXPHYS - 1; 2722 2723 /* Prevent hostile input from being able to crash the system */ 2724 if (ifc->ifc_len <= 0) 2725 return (EINVAL); 2726 2727 again: 2728 if (ifc->ifc_len <= max_len) { 2729 max_len = ifc->ifc_len; 2730 full = 1; 2731 } 2732 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2733 max_len = 0; 2734 valid_len = 0; 2735 2736 IFNET_RLOCK(); 2737 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2738 int addrs; 2739 2740 /* 2741 * Zero the ifr_name buffer to make sure we don't 2742 * disclose the contents of the stack. 2743 */ 2744 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2745 2746 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2747 >= sizeof(ifr.ifr_name)) { 2748 sbuf_delete(sb); 2749 IFNET_RUNLOCK(); 2750 return (ENAMETOOLONG); 2751 } 2752 2753 addrs = 0; 2754 IF_ADDR_LOCK(ifp); 2755 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2756 struct sockaddr *sa = ifa->ifa_addr; 2757 2758 if (prison_if(curthread->td_ucred, sa) != 0) 2759 continue; 2760 addrs++; 2761 #ifdef COMPAT_43 2762 if (cmd == OSIOCGIFCONF) { 2763 struct osockaddr *osa = 2764 (struct osockaddr *)&ifr.ifr_addr; 2765 ifr.ifr_addr = *sa; 2766 osa->sa_family = sa->sa_family; 2767 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2768 max_len += sizeof(ifr); 2769 } else 2770 #endif 2771 if (sa->sa_len <= sizeof(*sa)) { 2772 ifr.ifr_addr = *sa; 2773 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2774 max_len += sizeof(ifr); 2775 } else { 2776 sbuf_bcat(sb, &ifr, 2777 offsetof(struct ifreq, ifr_addr)); 2778 max_len += offsetof(struct ifreq, ifr_addr); 2779 sbuf_bcat(sb, sa, sa->sa_len); 2780 max_len += sa->sa_len; 2781 } 2782 2783 if (!sbuf_overflowed(sb)) 2784 valid_len = sbuf_len(sb); 2785 } 2786 IF_ADDR_UNLOCK(ifp); 2787 if (addrs == 0) { 2788 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2789 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2790 max_len += sizeof(ifr); 2791 2792 if (!sbuf_overflowed(sb)) 2793 valid_len = sbuf_len(sb); 2794 } 2795 } 2796 IFNET_RUNLOCK(); 2797 2798 /* 2799 * If we didn't allocate enough space (uncommon), try again. If 2800 * we have already allocated as much space as we are allowed, 2801 * return what we've got. 2802 */ 2803 if (valid_len != max_len && !full) { 2804 sbuf_delete(sb); 2805 goto again; 2806 } 2807 2808 ifc->ifc_len = valid_len; 2809 #ifdef __amd64__ 2810 if (cmd == SIOCGIFCONF32) 2811 ifc32->ifc_len = valid_len; 2812 #endif 2813 sbuf_finish(sb); 2814 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2815 sbuf_delete(sb); 2816 return (error); 2817 } 2818 2819 /* 2820 * Just like ifpromisc(), but for all-multicast-reception mode. 2821 */ 2822 int 2823 if_allmulti(struct ifnet *ifp, int onswitch) 2824 { 2825 2826 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2827 } 2828 2829 struct ifmultiaddr * 2830 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2831 { 2832 struct ifmultiaddr *ifma; 2833 2834 IF_ADDR_LOCK_ASSERT(ifp); 2835 2836 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2837 if (sa->sa_family == AF_LINK) { 2838 if (sa_dl_equal(ifma->ifma_addr, sa)) 2839 break; 2840 } else { 2841 if (sa_equal(ifma->ifma_addr, sa)) 2842 break; 2843 } 2844 } 2845 2846 return ifma; 2847 } 2848 2849 /* 2850 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2851 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2852 * the ifnet multicast address list here, so the caller must do that and 2853 * other setup work (such as notifying the device driver). The reference 2854 * count is initialized to 1. 2855 */ 2856 static struct ifmultiaddr * 2857 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2858 int mflags) 2859 { 2860 struct ifmultiaddr *ifma; 2861 struct sockaddr *dupsa; 2862 2863 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2864 M_ZERO); 2865 if (ifma == NULL) 2866 return (NULL); 2867 2868 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2869 if (dupsa == NULL) { 2870 free(ifma, M_IFMADDR); 2871 return (NULL); 2872 } 2873 bcopy(sa, dupsa, sa->sa_len); 2874 ifma->ifma_addr = dupsa; 2875 2876 ifma->ifma_ifp = ifp; 2877 ifma->ifma_refcount = 1; 2878 ifma->ifma_protospec = NULL; 2879 2880 if (llsa == NULL) { 2881 ifma->ifma_lladdr = NULL; 2882 return (ifma); 2883 } 2884 2885 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2886 if (dupsa == NULL) { 2887 free(ifma->ifma_addr, M_IFMADDR); 2888 free(ifma, M_IFMADDR); 2889 return (NULL); 2890 } 2891 bcopy(llsa, dupsa, llsa->sa_len); 2892 ifma->ifma_lladdr = dupsa; 2893 2894 return (ifma); 2895 } 2896 2897 /* 2898 * if_freemulti: free ifmultiaddr structure and possibly attached related 2899 * addresses. The caller is responsible for implementing reference 2900 * counting, notifying the driver, handling routing messages, and releasing 2901 * any dependent link layer state. 2902 */ 2903 static void 2904 if_freemulti(struct ifmultiaddr *ifma) 2905 { 2906 2907 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2908 ifma->ifma_refcount)); 2909 KASSERT(ifma->ifma_protospec == NULL, 2910 ("if_freemulti: protospec not NULL")); 2911 2912 if (ifma->ifma_lladdr != NULL) 2913 free(ifma->ifma_lladdr, M_IFMADDR); 2914 free(ifma->ifma_addr, M_IFMADDR); 2915 free(ifma, M_IFMADDR); 2916 } 2917 2918 /* 2919 * Register an additional multicast address with a network interface. 2920 * 2921 * - If the address is already present, bump the reference count on the 2922 * address and return. 2923 * - If the address is not link-layer, look up a link layer address. 2924 * - Allocate address structures for one or both addresses, and attach to the 2925 * multicast address list on the interface. If automatically adding a link 2926 * layer address, the protocol address will own a reference to the link 2927 * layer address, to be freed when it is freed. 2928 * - Notify the network device driver of an addition to the multicast address 2929 * list. 2930 * 2931 * 'sa' points to caller-owned memory with the desired multicast address. 2932 * 2933 * 'retifma' will be used to return a pointer to the resulting multicast 2934 * address reference, if desired. 2935 */ 2936 int 2937 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2938 struct ifmultiaddr **retifma) 2939 { 2940 struct ifmultiaddr *ifma, *ll_ifma; 2941 struct sockaddr *llsa; 2942 int error; 2943 2944 /* 2945 * If the address is already present, return a new reference to it; 2946 * otherwise, allocate storage and set up a new address. 2947 */ 2948 IF_ADDR_LOCK(ifp); 2949 ifma = if_findmulti(ifp, sa); 2950 if (ifma != NULL) { 2951 ifma->ifma_refcount++; 2952 if (retifma != NULL) 2953 *retifma = ifma; 2954 IF_ADDR_UNLOCK(ifp); 2955 return (0); 2956 } 2957 2958 /* 2959 * The address isn't already present; resolve the protocol address 2960 * into a link layer address, and then look that up, bump its 2961 * refcount or allocate an ifma for that also. If 'llsa' was 2962 * returned, we will need to free it later. 2963 */ 2964 llsa = NULL; 2965 ll_ifma = NULL; 2966 if (ifp->if_resolvemulti != NULL) { 2967 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2968 if (error) 2969 goto unlock_out; 2970 } 2971 2972 /* 2973 * Allocate the new address. Don't hook it up yet, as we may also 2974 * need to allocate a link layer multicast address. 2975 */ 2976 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2977 if (ifma == NULL) { 2978 error = ENOMEM; 2979 goto free_llsa_out; 2980 } 2981 2982 /* 2983 * If a link layer address is found, we'll need to see if it's 2984 * already present in the address list, or allocate is as well. 2985 * When this block finishes, the link layer address will be on the 2986 * list. 2987 */ 2988 if (llsa != NULL) { 2989 ll_ifma = if_findmulti(ifp, llsa); 2990 if (ll_ifma == NULL) { 2991 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2992 if (ll_ifma == NULL) { 2993 --ifma->ifma_refcount; 2994 if_freemulti(ifma); 2995 error = ENOMEM; 2996 goto free_llsa_out; 2997 } 2998 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2999 ifma_link); 3000 } else 3001 ll_ifma->ifma_refcount++; 3002 ifma->ifma_llifma = ll_ifma; 3003 } 3004 3005 /* 3006 * We now have a new multicast address, ifma, and possibly a new or 3007 * referenced link layer address. Add the primary address to the 3008 * ifnet address list. 3009 */ 3010 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3011 3012 if (retifma != NULL) 3013 *retifma = ifma; 3014 3015 /* 3016 * Must generate the message while holding the lock so that 'ifma' 3017 * pointer is still valid. 3018 */ 3019 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3020 IF_ADDR_UNLOCK(ifp); 3021 3022 /* 3023 * We are certain we have added something, so call down to the 3024 * interface to let them know about it. 3025 */ 3026 if (ifp->if_ioctl != NULL) { 3027 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3028 } 3029 3030 if (llsa != NULL) 3031 free(llsa, M_IFMADDR); 3032 3033 return (0); 3034 3035 free_llsa_out: 3036 if (llsa != NULL) 3037 free(llsa, M_IFMADDR); 3038 3039 unlock_out: 3040 IF_ADDR_UNLOCK(ifp); 3041 return (error); 3042 } 3043 3044 /* 3045 * Delete a multicast group membership by network-layer group address. 3046 * 3047 * Returns ENOENT if the entry could not be found. If ifp no longer 3048 * exists, results are undefined. This entry point should only be used 3049 * from subsystems which do appropriate locking to hold ifp for the 3050 * duration of the call. 3051 * Network-layer protocol domains must use if_delmulti_ifma(). 3052 */ 3053 int 3054 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3055 { 3056 struct ifmultiaddr *ifma; 3057 int lastref; 3058 #ifdef INVARIANTS 3059 struct ifnet *oifp; 3060 3061 IFNET_RLOCK_NOSLEEP(); 3062 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3063 if (ifp == oifp) 3064 break; 3065 if (ifp != oifp) 3066 ifp = NULL; 3067 IFNET_RUNLOCK_NOSLEEP(); 3068 3069 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3070 #endif 3071 if (ifp == NULL) 3072 return (ENOENT); 3073 3074 IF_ADDR_LOCK(ifp); 3075 lastref = 0; 3076 ifma = if_findmulti(ifp, sa); 3077 if (ifma != NULL) 3078 lastref = if_delmulti_locked(ifp, ifma, 0); 3079 IF_ADDR_UNLOCK(ifp); 3080 3081 if (ifma == NULL) 3082 return (ENOENT); 3083 3084 if (lastref && ifp->if_ioctl != NULL) { 3085 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3086 } 3087 3088 return (0); 3089 } 3090 3091 /* 3092 * Delete all multicast group membership for an interface. 3093 * Should be used to quickly flush all multicast filters. 3094 */ 3095 void 3096 if_delallmulti(struct ifnet *ifp) 3097 { 3098 struct ifmultiaddr *ifma; 3099 struct ifmultiaddr *next; 3100 3101 IF_ADDR_LOCK(ifp); 3102 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3103 if_delmulti_locked(ifp, ifma, 0); 3104 IF_ADDR_UNLOCK(ifp); 3105 } 3106 3107 /* 3108 * Delete a multicast group membership by group membership pointer. 3109 * Network-layer protocol domains must use this routine. 3110 * 3111 * It is safe to call this routine if the ifp disappeared. 3112 */ 3113 void 3114 if_delmulti_ifma(struct ifmultiaddr *ifma) 3115 { 3116 struct ifnet *ifp; 3117 int lastref; 3118 3119 ifp = ifma->ifma_ifp; 3120 #ifdef DIAGNOSTIC 3121 if (ifp == NULL) { 3122 printf("%s: ifma_ifp seems to be detached\n", __func__); 3123 } else { 3124 struct ifnet *oifp; 3125 3126 IFNET_RLOCK_NOSLEEP(); 3127 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3128 if (ifp == oifp) 3129 break; 3130 if (ifp != oifp) { 3131 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3132 ifp = NULL; 3133 } 3134 IFNET_RUNLOCK_NOSLEEP(); 3135 } 3136 #endif 3137 /* 3138 * If and only if the ifnet instance exists: Acquire the address lock. 3139 */ 3140 if (ifp != NULL) 3141 IF_ADDR_LOCK(ifp); 3142 3143 lastref = if_delmulti_locked(ifp, ifma, 0); 3144 3145 if (ifp != NULL) { 3146 /* 3147 * If and only if the ifnet instance exists: 3148 * Release the address lock. 3149 * If the group was left: update the hardware hash filter. 3150 */ 3151 IF_ADDR_UNLOCK(ifp); 3152 if (lastref && ifp->if_ioctl != NULL) { 3153 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3154 } 3155 } 3156 } 3157 3158 /* 3159 * Perform deletion of network-layer and/or link-layer multicast address. 3160 * 3161 * Return 0 if the reference count was decremented. 3162 * Return 1 if the final reference was released, indicating that the 3163 * hardware hash filter should be reprogrammed. 3164 */ 3165 static int 3166 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3167 { 3168 struct ifmultiaddr *ll_ifma; 3169 3170 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3171 KASSERT(ifma->ifma_ifp == ifp, 3172 ("%s: inconsistent ifp %p", __func__, ifp)); 3173 IF_ADDR_LOCK_ASSERT(ifp); 3174 } 3175 3176 ifp = ifma->ifma_ifp; 3177 3178 /* 3179 * If the ifnet is detaching, null out references to ifnet, 3180 * so that upper protocol layers will notice, and not attempt 3181 * to obtain locks for an ifnet which no longer exists. The 3182 * routing socket announcement must happen before the ifnet 3183 * instance is detached from the system. 3184 */ 3185 if (detaching) { 3186 #ifdef DIAGNOSTIC 3187 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3188 #endif 3189 /* 3190 * ifp may already be nulled out if we are being reentered 3191 * to delete the ll_ifma. 3192 */ 3193 if (ifp != NULL) { 3194 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3195 ifma->ifma_ifp = NULL; 3196 } 3197 } 3198 3199 if (--ifma->ifma_refcount > 0) 3200 return 0; 3201 3202 /* 3203 * If this ifma is a network-layer ifma, a link-layer ifma may 3204 * have been associated with it. Release it first if so. 3205 */ 3206 ll_ifma = ifma->ifma_llifma; 3207 if (ll_ifma != NULL) { 3208 KASSERT(ifma->ifma_lladdr != NULL, 3209 ("%s: llifma w/o lladdr", __func__)); 3210 if (detaching) 3211 ll_ifma->ifma_ifp = NULL; /* XXX */ 3212 if (--ll_ifma->ifma_refcount == 0) { 3213 if (ifp != NULL) { 3214 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3215 ifma_link); 3216 } 3217 if_freemulti(ll_ifma); 3218 } 3219 } 3220 3221 if (ifp != NULL) 3222 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3223 3224 if_freemulti(ifma); 3225 3226 /* 3227 * The last reference to this instance of struct ifmultiaddr 3228 * was released; the hardware should be notified of this change. 3229 */ 3230 return 1; 3231 } 3232 3233 /* 3234 * Set the link layer address on an interface. 3235 * 3236 * At this time we only support certain types of interfaces, 3237 * and we don't allow the length of the address to change. 3238 */ 3239 int 3240 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3241 { 3242 struct sockaddr_dl *sdl; 3243 struct ifaddr *ifa; 3244 struct ifreq ifr; 3245 3246 IF_ADDR_LOCK(ifp); 3247 ifa = ifp->if_addr; 3248 if (ifa == NULL) { 3249 IF_ADDR_UNLOCK(ifp); 3250 return (EINVAL); 3251 } 3252 ifa_ref(ifa); 3253 IF_ADDR_UNLOCK(ifp); 3254 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3255 if (sdl == NULL) { 3256 ifa_free(ifa); 3257 return (EINVAL); 3258 } 3259 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3260 ifa_free(ifa); 3261 return (EINVAL); 3262 } 3263 switch (ifp->if_type) { 3264 case IFT_ETHER: 3265 case IFT_FDDI: 3266 case IFT_XETHER: 3267 case IFT_ISO88025: 3268 case IFT_L2VLAN: 3269 case IFT_BRIDGE: 3270 case IFT_ARCNET: 3271 case IFT_IEEE8023ADLAG: 3272 case IFT_IEEE80211: 3273 bcopy(lladdr, LLADDR(sdl), len); 3274 ifa_free(ifa); 3275 break; 3276 default: 3277 ifa_free(ifa); 3278 return (ENODEV); 3279 } 3280 3281 /* 3282 * If the interface is already up, we need 3283 * to re-init it in order to reprogram its 3284 * address filter. 3285 */ 3286 if ((ifp->if_flags & IFF_UP) != 0) { 3287 if (ifp->if_ioctl) { 3288 ifp->if_flags &= ~IFF_UP; 3289 ifr.ifr_flags = ifp->if_flags & 0xffff; 3290 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3291 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3292 ifp->if_flags |= IFF_UP; 3293 ifr.ifr_flags = ifp->if_flags & 0xffff; 3294 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3295 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3296 } 3297 #ifdef INET 3298 /* 3299 * Also send gratuitous ARPs to notify other nodes about 3300 * the address change. 3301 */ 3302 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3303 if (ifa->ifa_addr->sa_family == AF_INET) 3304 arp_ifinit(ifp, ifa); 3305 } 3306 #endif 3307 } 3308 return (0); 3309 } 3310 3311 /* 3312 * The name argument must be a pointer to storage which will last as 3313 * long as the interface does. For physical devices, the result of 3314 * device_get_name(dev) is a good choice and for pseudo-devices a 3315 * static string works well. 3316 */ 3317 void 3318 if_initname(struct ifnet *ifp, const char *name, int unit) 3319 { 3320 ifp->if_dname = name; 3321 ifp->if_dunit = unit; 3322 if (unit != IF_DUNIT_NONE) 3323 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3324 else 3325 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3326 } 3327 3328 int 3329 if_printf(struct ifnet *ifp, const char * fmt, ...) 3330 { 3331 va_list ap; 3332 int retval; 3333 3334 retval = printf("%s: ", ifp->if_xname); 3335 va_start(ap, fmt); 3336 retval += vprintf(fmt, ap); 3337 va_end(ap); 3338 return (retval); 3339 } 3340 3341 void 3342 if_start(struct ifnet *ifp) 3343 { 3344 3345 (*(ifp)->if_start)(ifp); 3346 } 3347 3348 /* 3349 * Backwards compatibility interface for drivers 3350 * that have not implemented it 3351 */ 3352 static int 3353 if_transmit(struct ifnet *ifp, struct mbuf *m) 3354 { 3355 int error; 3356 3357 IFQ_HANDOFF(ifp, m, error); 3358 return (error); 3359 } 3360 3361 int 3362 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3363 { 3364 int active = 0; 3365 3366 IF_LOCK(ifq); 3367 if (_IF_QFULL(ifq)) { 3368 _IF_DROP(ifq); 3369 IF_UNLOCK(ifq); 3370 m_freem(m); 3371 return (0); 3372 } 3373 if (ifp != NULL) { 3374 ifp->if_obytes += m->m_pkthdr.len + adjust; 3375 if (m->m_flags & (M_BCAST|M_MCAST)) 3376 ifp->if_omcasts++; 3377 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3378 } 3379 _IF_ENQUEUE(ifq, m); 3380 IF_UNLOCK(ifq); 3381 if (ifp != NULL && !active) 3382 (*(ifp)->if_start)(ifp); 3383 return (1); 3384 } 3385 3386 void 3387 if_register_com_alloc(u_char type, 3388 if_com_alloc_t *a, if_com_free_t *f) 3389 { 3390 3391 KASSERT(if_com_alloc[type] == NULL, 3392 ("if_register_com_alloc: %d already registered", type)); 3393 KASSERT(if_com_free[type] == NULL, 3394 ("if_register_com_alloc: %d free already registered", type)); 3395 3396 if_com_alloc[type] = a; 3397 if_com_free[type] = f; 3398 } 3399 3400 void 3401 if_deregister_com_alloc(u_char type) 3402 { 3403 3404 KASSERT(if_com_alloc[type] != NULL, 3405 ("if_deregister_com_alloc: %d not registered", type)); 3406 KASSERT(if_com_free[type] != NULL, 3407 ("if_deregister_com_alloc: %d free not registered", type)); 3408 if_com_alloc[type] = NULL; 3409 if_com_free[type] = NULL; 3410 } 3411 3412 #ifdef DDB 3413 static void 3414 if_show_ifnet(struct ifnet *ifp) 3415 { 3416 3417 if (ifp == NULL) 3418 return; 3419 db_printf("%s:\n", ifp->if_xname); 3420 #define IF_DB_PRINTF(f, e) db_printf(" %s = " f "\n", #e, ifp->e); 3421 IF_DB_PRINTF("%s", if_dname); 3422 IF_DB_PRINTF("%d", if_dunit); 3423 IF_DB_PRINTF("%s", if_description); 3424 IF_DB_PRINTF("%u", if_index); 3425 IF_DB_PRINTF("%u", if_refcount); 3426 IF_DB_PRINTF("%p", if_softc); 3427 IF_DB_PRINTF("%p", if_l2com); 3428 IF_DB_PRINTF("%p", if_vnet); 3429 IF_DB_PRINTF("%p", if_home_vnet); 3430 IF_DB_PRINTF("%p", if_addr); 3431 IF_DB_PRINTF("%p", if_llsoftc); 3432 IF_DB_PRINTF("%p", if_label); 3433 IF_DB_PRINTF("%u", if_pcount); 3434 IF_DB_PRINTF("0x%08x", if_flags); 3435 IF_DB_PRINTF("0x%08x", if_drv_flags); 3436 IF_DB_PRINTF("0x%08x", if_capabilities); 3437 IF_DB_PRINTF("0x%08x", if_capenable); 3438 IF_DB_PRINTF("%p", if_snd.ifq_head); 3439 IF_DB_PRINTF("%p", if_snd.ifq_tail); 3440 IF_DB_PRINTF("%d", if_snd.ifq_len); 3441 IF_DB_PRINTF("%d", if_snd.ifq_maxlen); 3442 IF_DB_PRINTF("%d", if_snd.ifq_drops); 3443 IF_DB_PRINTF("%p", if_snd.ifq_drv_head); 3444 IF_DB_PRINTF("%p", if_snd.ifq_drv_tail); 3445 IF_DB_PRINTF("%d", if_snd.ifq_drv_len); 3446 IF_DB_PRINTF("%d", if_snd.ifq_drv_maxlen); 3447 IF_DB_PRINTF("%d", if_snd.altq_type); 3448 IF_DB_PRINTF("%x", if_snd.altq_flags); 3449 #undef IF_DB_PRINTF 3450 } 3451 3452 DB_SHOW_COMMAND(ifnet, db_show_ifnet) 3453 { 3454 3455 if (!have_addr) { 3456 db_printf("usage: show ifnet <struct ifnet *>\n"); 3457 return; 3458 } 3459 3460 if_show_ifnet((struct ifnet *)addr); 3461 } 3462 3463 DB_SHOW_ALL_COMMAND(ifnets, db_show_all_ifnets) 3464 { 3465 VNET_ITERATOR_DECL(vnet_iter); 3466 struct ifnet *ifp; 3467 u_short idx; 3468 3469 VNET_FOREACH(vnet_iter) { 3470 CURVNET_SET_QUIET(vnet_iter); 3471 #ifdef VIMAGE 3472 db_printf("vnet=%p\n", curvnet); 3473 #endif 3474 for (idx = 1; idx <= V_if_index; idx++) { 3475 ifp = V_ifindex_table[idx].ife_ifnet; 3476 if (ifp == NULL) 3477 continue; 3478 db_printf( "%20s ifp=%p\n", ifp->if_xname, ifp); 3479 if (db_pager_quit) 3480 break; 3481 } 3482 CURVNET_RESTORE(); 3483 } 3484 } 3485 #endif
Cache object: 81c9a0fefdda8869de3c5ecf0c7ac927
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]