1 /*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD$ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/conf.h> 40 #include <sys/malloc.h> 41 #include <sys/sbuf.h> 42 #include <sys/bus.h> 43 #include <sys/mbuf.h> 44 #include <sys/systm.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/protosw.h> 50 #include <sys/kernel.h> 51 #include <sys/lock.h> 52 #include <sys/refcount.h> 53 #include <sys/module.h> 54 #include <sys/rwlock.h> 55 #include <sys/sockio.h> 56 #include <sys/syslog.h> 57 #include <sys/sysctl.h> 58 #include <sys/taskqueue.h> 59 #include <sys/domain.h> 60 #include <sys/jail.h> 61 #include <sys/priv.h> 62 63 #include <machine/stdarg.h> 64 #include <vm/uma.h> 65 66 #include <net/if.h> 67 #include <net/if_arp.h> 68 #include <net/if_clone.h> 69 #include <net/if_dl.h> 70 #include <net/if_types.h> 71 #include <net/if_var.h> 72 #include <net/radix.h> 73 #include <net/route.h> 74 #include <net/vnet.h> 75 76 #if defined(INET) || defined(INET6) 77 /*XXX*/ 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 #include <netinet/ip_carp.h> 81 #ifdef INET6 82 #include <netinet6/in6_var.h> 83 #include <netinet6/in6_ifattach.h> 84 #endif 85 #endif 86 #ifdef INET 87 #include <netinet/if_ether.h> 88 #endif 89 90 #include <security/mac/mac_framework.h> 91 92 #ifdef COMPAT_FREEBSD32 93 #include <sys/mount.h> 94 #include <compat/freebsd32/freebsd32.h> 95 #endif 96 97 struct ifindex_entry { 98 struct ifnet *ife_ifnet; 99 }; 100 101 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 102 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 103 104 TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen); 105 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 106 &ifqmaxlen, 0, "max send queue size"); 107 108 /* Log link state change events */ 109 static int log_link_state_change = 1; 110 111 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 112 &log_link_state_change, 0, 113 "log interface link state change events"); 114 115 /* Interface description */ 116 static unsigned int ifdescr_maxlen = 1024; 117 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 118 &ifdescr_maxlen, 0, 119 "administrative maximum length for interface description"); 120 121 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 122 123 /* global sx for non-critical path ifdescr */ 124 static struct sx ifdescr_sx; 125 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 126 127 void (*bridge_linkstate_p)(struct ifnet *ifp); 128 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 129 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 130 /* These are external hooks for CARP. */ 131 void (*carp_linkstate_p)(struct ifnet *ifp); 132 void (*carp_demote_adj_p)(int, char *); 133 #if defined(INET) || defined(INET6) 134 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 135 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 136 struct sockaddr *sa); 137 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 138 int (*carp_attach_p)(struct ifaddr *, int); 139 void (*carp_detach_p)(struct ifaddr *); 140 #endif 141 #ifdef INET 142 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 143 #endif 144 #ifdef INET6 145 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 146 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 147 const struct in6_addr *taddr); 148 #endif 149 150 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 151 152 /* 153 * XXX: Style; these should be sorted alphabetically, and unprototyped 154 * static functions should be prototyped. Currently they are sorted by 155 * declaration order. 156 */ 157 static void if_attachdomain(void *); 158 static void if_attachdomain1(struct ifnet *); 159 static int ifconf(u_long, caddr_t); 160 static void if_freemulti(struct ifmultiaddr *); 161 static void if_init(void *); 162 static void if_grow(void); 163 static void if_route(struct ifnet *, int flag, int fam); 164 static int if_setflag(struct ifnet *, int, int, int *, int); 165 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 166 static void if_unroute(struct ifnet *, int flag, int fam); 167 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 168 static int if_rtdel(struct radix_node *, void *); 169 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 170 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 171 static void do_link_state_change(void *, int); 172 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 173 static int if_getgroupmembers(struct ifgroupreq *); 174 static void if_delgroups(struct ifnet *); 175 static void if_attach_internal(struct ifnet *, int); 176 static void if_detach_internal(struct ifnet *, int); 177 178 #ifdef INET6 179 /* 180 * XXX: declare here to avoid to include many inet6 related files.. 181 * should be more generalized? 182 */ 183 extern void nd6_setmtu(struct ifnet *); 184 #endif 185 186 VNET_DEFINE(int, if_index); 187 int ifqmaxlen = IFQ_MAXLEN; 188 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 189 VNET_DEFINE(struct ifgrouphead, ifg_head); 190 191 static VNET_DEFINE(int, if_indexlim) = 8; 192 193 /* Table of ifnet by index. */ 194 VNET_DEFINE(struct ifindex_entry *, ifindex_table); 195 196 #define V_if_indexlim VNET(if_indexlim) 197 #define V_ifindex_table VNET(ifindex_table) 198 199 /* 200 * The global network interface list (V_ifnet) and related state (such as 201 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 202 * an rwlock. Either may be acquired shared to stablize the list, but both 203 * must be acquired writable to modify the list. This model allows us to 204 * both stablize the interface list during interrupt thread processing, but 205 * also to stablize it over long-running ioctls, without introducing priority 206 * inversions and deadlocks. 207 */ 208 struct rwlock ifnet_rwlock; 209 struct sx ifnet_sxlock; 210 211 /* 212 * The allocation of network interfaces is a rather non-atomic affair; we 213 * need to select an index before we are ready to expose the interface for 214 * use, so will use this pointer value to indicate reservation. 215 */ 216 #define IFNET_HOLD (void *)(uintptr_t)(-1) 217 218 static if_com_alloc_t *if_com_alloc[256]; 219 static if_com_free_t *if_com_free[256]; 220 221 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 222 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 223 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 224 225 struct ifnet * 226 ifnet_byindex_locked(u_short idx) 227 { 228 229 if (idx > V_if_index) 230 return (NULL); 231 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 232 return (NULL); 233 return (V_ifindex_table[idx].ife_ifnet); 234 } 235 236 struct ifnet * 237 ifnet_byindex(u_short idx) 238 { 239 struct ifnet *ifp; 240 241 IFNET_RLOCK_NOSLEEP(); 242 ifp = ifnet_byindex_locked(idx); 243 IFNET_RUNLOCK_NOSLEEP(); 244 return (ifp); 245 } 246 247 struct ifnet * 248 ifnet_byindex_ref(u_short idx) 249 { 250 struct ifnet *ifp; 251 252 IFNET_RLOCK_NOSLEEP(); 253 ifp = ifnet_byindex_locked(idx); 254 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 255 IFNET_RUNLOCK_NOSLEEP(); 256 return (NULL); 257 } 258 if_ref(ifp); 259 IFNET_RUNLOCK_NOSLEEP(); 260 return (ifp); 261 } 262 263 /* 264 * Allocate an ifindex array entry; return 0 on success or an error on 265 * failure. 266 */ 267 static int 268 ifindex_alloc_locked(u_short *idxp) 269 { 270 u_short idx; 271 272 IFNET_WLOCK_ASSERT(); 273 274 retry: 275 /* 276 * Try to find an empty slot below V_if_index. If we fail, take the 277 * next slot. 278 */ 279 for (idx = 1; idx <= V_if_index; idx++) { 280 if (V_ifindex_table[idx].ife_ifnet == NULL) 281 break; 282 } 283 284 /* Catch if_index overflow. */ 285 if (idx < 1) 286 return (ENOSPC); 287 if (idx >= V_if_indexlim) { 288 if_grow(); 289 goto retry; 290 } 291 if (idx > V_if_index) 292 V_if_index = idx; 293 *idxp = idx; 294 return (0); 295 } 296 297 static void 298 ifindex_free_locked(u_short idx) 299 { 300 301 IFNET_WLOCK_ASSERT(); 302 303 V_ifindex_table[idx].ife_ifnet = NULL; 304 while (V_if_index > 0 && 305 V_ifindex_table[V_if_index].ife_ifnet == NULL) 306 V_if_index--; 307 } 308 309 static void 310 ifindex_free(u_short idx) 311 { 312 313 IFNET_WLOCK(); 314 ifindex_free_locked(idx); 315 IFNET_WUNLOCK(); 316 } 317 318 static void 319 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 320 { 321 322 IFNET_WLOCK_ASSERT(); 323 324 V_ifindex_table[idx].ife_ifnet = ifp; 325 } 326 327 static void 328 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 329 { 330 331 IFNET_WLOCK(); 332 ifnet_setbyindex_locked(idx, ifp); 333 IFNET_WUNLOCK(); 334 } 335 336 struct ifaddr * 337 ifaddr_byindex(u_short idx) 338 { 339 struct ifaddr *ifa; 340 341 IFNET_RLOCK_NOSLEEP(); 342 ifa = ifnet_byindex_locked(idx)->if_addr; 343 if (ifa != NULL) 344 ifa_ref(ifa); 345 IFNET_RUNLOCK_NOSLEEP(); 346 return (ifa); 347 } 348 349 /* 350 * Network interface utility routines. 351 * 352 * Routines with ifa_ifwith* names take sockaddr *'s as 353 * parameters. 354 */ 355 356 static void 357 vnet_if_init(const void *unused __unused) 358 { 359 360 TAILQ_INIT(&V_ifnet); 361 TAILQ_INIT(&V_ifg_head); 362 IFNET_WLOCK(); 363 if_grow(); /* create initial table */ 364 IFNET_WUNLOCK(); 365 vnet_if_clone_init(); 366 } 367 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 368 NULL); 369 370 /* ARGSUSED*/ 371 static void 372 if_init(void *dummy __unused) 373 { 374 375 IFNET_LOCK_INIT(); 376 if_clone_init(); 377 } 378 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 379 380 381 #ifdef VIMAGE 382 static void 383 vnet_if_uninit(const void *unused __unused) 384 { 385 386 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 387 "not empty", __func__, __LINE__, &V_ifnet)); 388 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 389 "not empty", __func__, __LINE__, &V_ifg_head)); 390 391 free((caddr_t)V_ifindex_table, M_IFNET); 392 } 393 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 394 vnet_if_uninit, NULL); 395 #endif 396 397 static void 398 if_grow(void) 399 { 400 int oldlim; 401 u_int n; 402 struct ifindex_entry *e; 403 404 IFNET_WLOCK_ASSERT(); 405 oldlim = V_if_indexlim; 406 IFNET_WUNLOCK(); 407 n = (oldlim << 1) * sizeof(*e); 408 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 409 IFNET_WLOCK(); 410 if (V_if_indexlim != oldlim) { 411 free(e, M_IFNET); 412 return; 413 } 414 if (V_ifindex_table != NULL) { 415 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 416 free((caddr_t)V_ifindex_table, M_IFNET); 417 } 418 V_if_indexlim <<= 1; 419 V_ifindex_table = e; 420 } 421 422 /* 423 * Allocate a struct ifnet and an index for an interface. A layer 2 424 * common structure will also be allocated if an allocation routine is 425 * registered for the passed type. 426 */ 427 struct ifnet * 428 if_alloc(u_char type) 429 { 430 struct ifnet *ifp; 431 u_short idx; 432 433 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 434 IFNET_WLOCK(); 435 if (ifindex_alloc_locked(&idx) != 0) { 436 IFNET_WUNLOCK(); 437 free(ifp, M_IFNET); 438 return (NULL); 439 } 440 ifnet_setbyindex_locked(idx, IFNET_HOLD); 441 IFNET_WUNLOCK(); 442 ifp->if_index = idx; 443 ifp->if_type = type; 444 ifp->if_alloctype = type; 445 if (if_com_alloc[type] != NULL) { 446 ifp->if_l2com = if_com_alloc[type](type, ifp); 447 if (ifp->if_l2com == NULL) { 448 free(ifp, M_IFNET); 449 ifindex_free(idx); 450 return (NULL); 451 } 452 } 453 454 IF_ADDR_LOCK_INIT(ifp); 455 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 456 ifp->if_afdata_initialized = 0; 457 IF_AFDATA_LOCK_INIT(ifp); 458 TAILQ_INIT(&ifp->if_addrhead); 459 TAILQ_INIT(&ifp->if_multiaddrs); 460 TAILQ_INIT(&ifp->if_groups); 461 #ifdef MAC 462 mac_ifnet_init(ifp); 463 #endif 464 ifq_init(&ifp->if_snd, ifp); 465 466 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 467 ifnet_setbyindex(ifp->if_index, ifp); 468 return (ifp); 469 } 470 471 /* 472 * Do the actual work of freeing a struct ifnet, and layer 2 common 473 * structure. This call is made when the last reference to an 474 * interface is released. 475 */ 476 static void 477 if_free_internal(struct ifnet *ifp) 478 { 479 480 KASSERT((ifp->if_flags & IFF_DYING), 481 ("if_free_internal: interface not dying")); 482 483 if (if_com_free[ifp->if_alloctype] != NULL) 484 if_com_free[ifp->if_alloctype](ifp->if_l2com, 485 ifp->if_alloctype); 486 487 #ifdef MAC 488 mac_ifnet_destroy(ifp); 489 #endif /* MAC */ 490 if (ifp->if_description != NULL) 491 free(ifp->if_description, M_IFDESCR); 492 IF_AFDATA_DESTROY(ifp); 493 IF_ADDR_LOCK_DESTROY(ifp); 494 ifq_delete(&ifp->if_snd); 495 free(ifp, M_IFNET); 496 } 497 498 /* 499 * Deregister an interface and free the associated storage. 500 */ 501 void 502 if_free(struct ifnet *ifp) 503 { 504 505 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 506 507 IFNET_WLOCK(); 508 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 509 ("%s: freeing unallocated ifnet", ifp->if_xname)); 510 511 ifindex_free_locked(ifp->if_index); 512 IFNET_WUNLOCK(); 513 514 if (!refcount_release(&ifp->if_refcount)) 515 return; 516 if_free_internal(ifp); 517 } 518 519 /* 520 * Interfaces to keep an ifnet type-stable despite the possibility of the 521 * driver calling if_free(). If there are additional references, we defer 522 * freeing the underlying data structure. 523 */ 524 void 525 if_ref(struct ifnet *ifp) 526 { 527 528 /* We don't assert the ifnet list lock here, but arguably should. */ 529 refcount_acquire(&ifp->if_refcount); 530 } 531 532 void 533 if_rele(struct ifnet *ifp) 534 { 535 536 if (!refcount_release(&ifp->if_refcount)) 537 return; 538 if_free_internal(ifp); 539 } 540 541 void 542 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 543 { 544 545 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 546 547 if (ifq->ifq_maxlen == 0) 548 ifq->ifq_maxlen = ifqmaxlen; 549 550 ifq->altq_type = 0; 551 ifq->altq_disc = NULL; 552 ifq->altq_flags &= ALTQF_CANTCHANGE; 553 ifq->altq_tbr = NULL; 554 ifq->altq_ifp = ifp; 555 } 556 557 void 558 ifq_delete(struct ifaltq *ifq) 559 { 560 mtx_destroy(&ifq->ifq_mtx); 561 } 562 563 /* 564 * Perform generic interface initalization tasks and attach the interface 565 * to the list of "active" interfaces. If vmove flag is set on entry 566 * to if_attach_internal(), perform only a limited subset of initialization 567 * tasks, given that we are moving from one vnet to another an ifnet which 568 * has already been fully initialized. 569 * 570 * XXX: 571 * - The decision to return void and thus require this function to 572 * succeed is questionable. 573 * - We should probably do more sanity checking. For instance we don't 574 * do anything to insure if_xname is unique or non-empty. 575 */ 576 void 577 if_attach(struct ifnet *ifp) 578 { 579 580 if_attach_internal(ifp, 0); 581 } 582 583 static void 584 if_attach_internal(struct ifnet *ifp, int vmove) 585 { 586 unsigned socksize, ifasize; 587 int namelen, masklen; 588 struct sockaddr_dl *sdl; 589 struct ifaddr *ifa; 590 591 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 592 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 593 ifp->if_xname); 594 595 #ifdef VIMAGE 596 ifp->if_vnet = curvnet; 597 if (ifp->if_home_vnet == NULL) 598 ifp->if_home_vnet = curvnet; 599 #endif 600 601 if_addgroup(ifp, IFG_ALL); 602 603 getmicrotime(&ifp->if_lastchange); 604 ifp->if_data.ifi_epoch = time_uptime; 605 ifp->if_data.ifi_datalen = sizeof(struct if_data); 606 607 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 608 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 609 ("transmit and qflush must both either be set or both be NULL")); 610 if (ifp->if_transmit == NULL) { 611 ifp->if_transmit = if_transmit; 612 ifp->if_qflush = if_qflush; 613 } 614 615 if (!vmove) { 616 #ifdef MAC 617 mac_ifnet_create(ifp); 618 #endif 619 620 /* 621 * Create a Link Level name for this device. 622 */ 623 namelen = strlen(ifp->if_xname); 624 /* 625 * Always save enough space for any possiable name so we 626 * can do a rename in place later. 627 */ 628 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 629 socksize = masklen + ifp->if_addrlen; 630 if (socksize < sizeof(*sdl)) 631 socksize = sizeof(*sdl); 632 socksize = roundup2(socksize, sizeof(long)); 633 ifasize = sizeof(*ifa) + 2 * socksize; 634 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 635 ifa_init(ifa); 636 sdl = (struct sockaddr_dl *)(ifa + 1); 637 sdl->sdl_len = socksize; 638 sdl->sdl_family = AF_LINK; 639 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 640 sdl->sdl_nlen = namelen; 641 sdl->sdl_index = ifp->if_index; 642 sdl->sdl_type = ifp->if_type; 643 ifp->if_addr = ifa; 644 ifa->ifa_ifp = ifp; 645 ifa->ifa_rtrequest = link_rtrequest; 646 ifa->ifa_addr = (struct sockaddr *)sdl; 647 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 648 ifa->ifa_netmask = (struct sockaddr *)sdl; 649 sdl->sdl_len = masklen; 650 while (namelen != 0) 651 sdl->sdl_data[--namelen] = 0xff; 652 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 653 /* Reliably crash if used uninitialized. */ 654 ifp->if_broadcastaddr = NULL; 655 } 656 #ifdef VIMAGE 657 else { 658 /* 659 * Update the interface index in the link layer address 660 * of the interface. 661 */ 662 for (ifa = ifp->if_addr; ifa != NULL; 663 ifa = TAILQ_NEXT(ifa, ifa_link)) { 664 if (ifa->ifa_addr->sa_family == AF_LINK) { 665 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 666 sdl->sdl_index = ifp->if_index; 667 } 668 } 669 } 670 #endif 671 672 IFNET_WLOCK(); 673 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 674 #ifdef VIMAGE 675 curvnet->vnet_ifcnt++; 676 #endif 677 IFNET_WUNLOCK(); 678 679 if (domain_init_status >= 2) 680 if_attachdomain1(ifp); 681 682 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 683 if (IS_DEFAULT_VNET(curvnet)) 684 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 685 686 /* Announce the interface. */ 687 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 688 } 689 690 static void 691 if_attachdomain(void *dummy) 692 { 693 struct ifnet *ifp; 694 int s; 695 696 s = splnet(); 697 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 698 if_attachdomain1(ifp); 699 splx(s); 700 } 701 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 702 if_attachdomain, NULL); 703 704 static void 705 if_attachdomain1(struct ifnet *ifp) 706 { 707 struct domain *dp; 708 int s; 709 710 s = splnet(); 711 712 /* 713 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 714 * cannot lock ifp->if_afdata initialization, entirely. 715 */ 716 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 717 splx(s); 718 return; 719 } 720 if (ifp->if_afdata_initialized >= domain_init_status) { 721 IF_AFDATA_UNLOCK(ifp); 722 splx(s); 723 printf("if_attachdomain called more than once on %s\n", 724 ifp->if_xname); 725 return; 726 } 727 ifp->if_afdata_initialized = domain_init_status; 728 IF_AFDATA_UNLOCK(ifp); 729 730 /* address family dependent data region */ 731 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 732 for (dp = domains; dp; dp = dp->dom_next) { 733 if (dp->dom_ifattach) 734 ifp->if_afdata[dp->dom_family] = 735 (*dp->dom_ifattach)(ifp); 736 } 737 738 splx(s); 739 } 740 741 /* 742 * Remove any unicast or broadcast network addresses from an interface. 743 */ 744 void 745 if_purgeaddrs(struct ifnet *ifp) 746 { 747 struct ifaddr *ifa, *next; 748 749 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 750 if (ifa->ifa_addr->sa_family == AF_LINK) 751 continue; 752 #ifdef INET 753 /* XXX: Ugly!! ad hoc just for INET */ 754 if (ifa->ifa_addr->sa_family == AF_INET) { 755 struct ifaliasreq ifr; 756 757 bzero(&ifr, sizeof(ifr)); 758 ifr.ifra_addr = *ifa->ifa_addr; 759 if (ifa->ifa_dstaddr) 760 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 761 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 762 NULL) == 0) 763 continue; 764 } 765 #endif /* INET */ 766 #ifdef INET6 767 if (ifa->ifa_addr->sa_family == AF_INET6) { 768 in6_purgeaddr(ifa); 769 /* ifp_addrhead is already updated */ 770 continue; 771 } 772 #endif /* INET6 */ 773 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 774 ifa_free(ifa); 775 } 776 } 777 778 /* 779 * Remove any multicast network addresses from an interface when an ifnet 780 * is going away. 781 */ 782 static void 783 if_purgemaddrs(struct ifnet *ifp) 784 { 785 struct ifmultiaddr *ifma; 786 struct ifmultiaddr *next; 787 788 IF_ADDR_WLOCK(ifp); 789 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 790 if_delmulti_locked(ifp, ifma, 1); 791 IF_ADDR_WUNLOCK(ifp); 792 } 793 794 /* 795 * Detach an interface, removing it from the list of "active" interfaces. 796 * If vmove flag is set on entry to if_detach_internal(), perform only a 797 * limited subset of cleanup tasks, given that we are moving an ifnet from 798 * one vnet to another, where it must be fully operational. 799 * 800 * XXXRW: There are some significant questions about event ordering, and 801 * how to prevent things from starting to use the interface during detach. 802 */ 803 void 804 if_detach(struct ifnet *ifp) 805 { 806 807 if_detach_internal(ifp, 0); 808 } 809 810 static void 811 if_detach_internal(struct ifnet *ifp, int vmove) 812 { 813 struct ifaddr *ifa; 814 struct radix_node_head *rnh; 815 int i, j; 816 struct domain *dp; 817 struct ifnet *iter; 818 int found = 0; 819 820 IFNET_WLOCK(); 821 TAILQ_FOREACH(iter, &V_ifnet, if_link) 822 if (iter == ifp) { 823 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 824 found = 1; 825 break; 826 } 827 #ifdef VIMAGE 828 if (found) 829 curvnet->vnet_ifcnt--; 830 #endif 831 IFNET_WUNLOCK(); 832 if (!found) { 833 if (vmove) 834 panic("%s: ifp=%p not on the ifnet tailq %p", 835 __func__, ifp, &V_ifnet); 836 else 837 return; /* XXX this should panic as well? */ 838 } 839 840 /* 841 * Remove/wait for pending events. 842 */ 843 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 844 845 /* 846 * Remove routes and flush queues. 847 */ 848 if_down(ifp); 849 #ifdef ALTQ 850 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 851 altq_disable(&ifp->if_snd); 852 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 853 altq_detach(&ifp->if_snd); 854 #endif 855 856 if_purgeaddrs(ifp); 857 858 #ifdef INET 859 in_ifdetach(ifp); 860 #endif 861 862 #ifdef INET6 863 /* 864 * Remove all IPv6 kernel structs related to ifp. This should be done 865 * before removing routing entries below, since IPv6 interface direct 866 * routes are expected to be removed by the IPv6-specific kernel API. 867 * Otherwise, the kernel will detect some inconsistency and bark it. 868 */ 869 in6_ifdetach(ifp); 870 #endif 871 if_purgemaddrs(ifp); 872 873 if (!vmove) { 874 /* 875 * Prevent further calls into the device driver via ifnet. 876 */ 877 if_dead(ifp); 878 879 /* 880 * Remove link ifaddr pointer and maybe decrement if_index. 881 * Clean up all addresses. 882 */ 883 ifp->if_addr = NULL; 884 885 /* We can now free link ifaddr. */ 886 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 887 ifa = TAILQ_FIRST(&ifp->if_addrhead); 888 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 889 ifa_free(ifa); 890 } 891 } 892 893 /* 894 * Delete all remaining routes using this interface 895 * Unfortuneatly the only way to do this is to slog through 896 * the entire routing table looking for routes which point 897 * to this interface...oh well... 898 */ 899 for (i = 1; i <= AF_MAX; i++) { 900 for (j = 0; j < rt_numfibs; j++) { 901 rnh = rt_tables_get_rnh(j, i); 902 if (rnh == NULL) 903 continue; 904 RADIX_NODE_HEAD_LOCK(rnh); 905 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 906 RADIX_NODE_HEAD_UNLOCK(rnh); 907 } 908 } 909 910 /* Announce that the interface is gone. */ 911 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 912 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 913 if (IS_DEFAULT_VNET(curvnet)) 914 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 915 if_delgroups(ifp); 916 917 /* 918 * We cannot hold the lock over dom_ifdetach calls as they might 919 * sleep, for example trying to drain a callout, thus open up the 920 * theoretical race with re-attaching. 921 */ 922 IF_AFDATA_LOCK(ifp); 923 i = ifp->if_afdata_initialized; 924 ifp->if_afdata_initialized = 0; 925 IF_AFDATA_UNLOCK(ifp); 926 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 927 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 928 (*dp->dom_ifdetach)(ifp, 929 ifp->if_afdata[dp->dom_family]); 930 } 931 } 932 933 #ifdef VIMAGE 934 /* 935 * if_vmove() performs a limited version of if_detach() in current 936 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 937 * An attempt is made to shrink if_index in current vnet, find an 938 * unused if_index in target vnet and calls if_grow() if necessary, 939 * and finally find an unused if_xname for the target vnet. 940 */ 941 void 942 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 943 { 944 u_short idx; 945 946 /* 947 * Detach from current vnet, but preserve LLADDR info, do not 948 * mark as dead etc. so that the ifnet can be reattached later. 949 */ 950 if_detach_internal(ifp, 1); 951 952 /* 953 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 954 * the if_index for that vnet if possible. 955 * 956 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 957 * or we'd lock on one vnet and unlock on another. 958 */ 959 IFNET_WLOCK(); 960 ifindex_free_locked(ifp->if_index); 961 IFNET_WUNLOCK(); 962 963 /* 964 * Perform interface-specific reassignment tasks, if provided by 965 * the driver. 966 */ 967 if (ifp->if_reassign != NULL) 968 ifp->if_reassign(ifp, new_vnet, NULL); 969 970 /* 971 * Switch to the context of the target vnet. 972 */ 973 CURVNET_SET_QUIET(new_vnet); 974 975 IFNET_WLOCK(); 976 if (ifindex_alloc_locked(&idx) != 0) { 977 IFNET_WUNLOCK(); 978 panic("if_index overflow"); 979 } 980 ifp->if_index = idx; 981 ifnet_setbyindex_locked(ifp->if_index, ifp); 982 IFNET_WUNLOCK(); 983 984 if_attach_internal(ifp, 1); 985 986 CURVNET_RESTORE(); 987 } 988 989 /* 990 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 991 */ 992 static int 993 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 994 { 995 struct prison *pr; 996 struct ifnet *difp; 997 998 /* Try to find the prison within our visibility. */ 999 sx_slock(&allprison_lock); 1000 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1001 sx_sunlock(&allprison_lock); 1002 if (pr == NULL) 1003 return (ENXIO); 1004 prison_hold_locked(pr); 1005 mtx_unlock(&pr->pr_mtx); 1006 1007 /* Do not try to move the iface from and to the same prison. */ 1008 if (pr->pr_vnet == ifp->if_vnet) { 1009 prison_free(pr); 1010 return (EEXIST); 1011 } 1012 1013 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1014 /* XXX Lock interfaces to avoid races. */ 1015 CURVNET_SET_QUIET(pr->pr_vnet); 1016 difp = ifunit(ifname); 1017 CURVNET_RESTORE(); 1018 if (difp != NULL) { 1019 prison_free(pr); 1020 return (EEXIST); 1021 } 1022 1023 /* Move the interface into the child jail/vnet. */ 1024 if_vmove(ifp, pr->pr_vnet); 1025 1026 /* Report the new if_xname back to the userland. */ 1027 sprintf(ifname, "%s", ifp->if_xname); 1028 1029 prison_free(pr); 1030 return (0); 1031 } 1032 1033 static int 1034 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1035 { 1036 struct prison *pr; 1037 struct vnet *vnet_dst; 1038 struct ifnet *ifp; 1039 1040 /* Try to find the prison within our visibility. */ 1041 sx_slock(&allprison_lock); 1042 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1043 sx_sunlock(&allprison_lock); 1044 if (pr == NULL) 1045 return (ENXIO); 1046 prison_hold_locked(pr); 1047 mtx_unlock(&pr->pr_mtx); 1048 1049 /* Make sure the named iface exists in the source prison/vnet. */ 1050 CURVNET_SET(pr->pr_vnet); 1051 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1052 if (ifp == NULL) { 1053 CURVNET_RESTORE(); 1054 prison_free(pr); 1055 return (ENXIO); 1056 } 1057 1058 /* Do not try to move the iface from and to the same prison. */ 1059 vnet_dst = TD_TO_VNET(td); 1060 if (vnet_dst == ifp->if_vnet) { 1061 CURVNET_RESTORE(); 1062 prison_free(pr); 1063 return (EEXIST); 1064 } 1065 1066 /* Get interface back from child jail/vnet. */ 1067 if_vmove(ifp, vnet_dst); 1068 CURVNET_RESTORE(); 1069 1070 /* Report the new if_xname back to the userland. */ 1071 sprintf(ifname, "%s", ifp->if_xname); 1072 1073 prison_free(pr); 1074 return (0); 1075 } 1076 #endif /* VIMAGE */ 1077 1078 /* 1079 * Add a group to an interface 1080 */ 1081 int 1082 if_addgroup(struct ifnet *ifp, const char *groupname) 1083 { 1084 struct ifg_list *ifgl; 1085 struct ifg_group *ifg = NULL; 1086 struct ifg_member *ifgm; 1087 int new = 0; 1088 1089 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1090 groupname[strlen(groupname) - 1] <= '9') 1091 return (EINVAL); 1092 1093 IFNET_WLOCK(); 1094 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1095 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1096 IFNET_WUNLOCK(); 1097 return (EEXIST); 1098 } 1099 1100 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1101 M_NOWAIT)) == NULL) { 1102 IFNET_WUNLOCK(); 1103 return (ENOMEM); 1104 } 1105 1106 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1107 M_TEMP, M_NOWAIT)) == NULL) { 1108 free(ifgl, M_TEMP); 1109 IFNET_WUNLOCK(); 1110 return (ENOMEM); 1111 } 1112 1113 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1114 if (!strcmp(ifg->ifg_group, groupname)) 1115 break; 1116 1117 if (ifg == NULL) { 1118 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1119 M_TEMP, M_NOWAIT)) == NULL) { 1120 free(ifgl, M_TEMP); 1121 free(ifgm, M_TEMP); 1122 IFNET_WUNLOCK(); 1123 return (ENOMEM); 1124 } 1125 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1126 ifg->ifg_refcnt = 0; 1127 TAILQ_INIT(&ifg->ifg_members); 1128 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1129 new = 1; 1130 } 1131 1132 ifg->ifg_refcnt++; 1133 ifgl->ifgl_group = ifg; 1134 ifgm->ifgm_ifp = ifp; 1135 1136 IF_ADDR_WLOCK(ifp); 1137 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1138 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1139 IF_ADDR_WUNLOCK(ifp); 1140 1141 IFNET_WUNLOCK(); 1142 1143 if (new) 1144 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1145 EVENTHANDLER_INVOKE(group_change_event, groupname); 1146 1147 return (0); 1148 } 1149 1150 /* 1151 * Remove a group from an interface 1152 */ 1153 int 1154 if_delgroup(struct ifnet *ifp, const char *groupname) 1155 { 1156 struct ifg_list *ifgl; 1157 struct ifg_member *ifgm; 1158 1159 IFNET_WLOCK(); 1160 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1161 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1162 break; 1163 if (ifgl == NULL) { 1164 IFNET_WUNLOCK(); 1165 return (ENOENT); 1166 } 1167 1168 IF_ADDR_WLOCK(ifp); 1169 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1170 IF_ADDR_WUNLOCK(ifp); 1171 1172 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1173 if (ifgm->ifgm_ifp == ifp) 1174 break; 1175 1176 if (ifgm != NULL) { 1177 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1178 free(ifgm, M_TEMP); 1179 } 1180 1181 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1182 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1183 IFNET_WUNLOCK(); 1184 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1185 free(ifgl->ifgl_group, M_TEMP); 1186 } else 1187 IFNET_WUNLOCK(); 1188 1189 free(ifgl, M_TEMP); 1190 1191 EVENTHANDLER_INVOKE(group_change_event, groupname); 1192 1193 return (0); 1194 } 1195 1196 /* 1197 * Remove an interface from all groups 1198 */ 1199 static void 1200 if_delgroups(struct ifnet *ifp) 1201 { 1202 struct ifg_list *ifgl; 1203 struct ifg_member *ifgm; 1204 char groupname[IFNAMSIZ]; 1205 1206 IFNET_WLOCK(); 1207 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1208 ifgl = TAILQ_FIRST(&ifp->if_groups); 1209 1210 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1211 1212 IF_ADDR_WLOCK(ifp); 1213 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1214 IF_ADDR_WUNLOCK(ifp); 1215 1216 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1217 if (ifgm->ifgm_ifp == ifp) 1218 break; 1219 1220 if (ifgm != NULL) { 1221 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1222 ifgm_next); 1223 free(ifgm, M_TEMP); 1224 } 1225 1226 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1227 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1228 IFNET_WUNLOCK(); 1229 EVENTHANDLER_INVOKE(group_detach_event, 1230 ifgl->ifgl_group); 1231 free(ifgl->ifgl_group, M_TEMP); 1232 } else 1233 IFNET_WUNLOCK(); 1234 1235 free(ifgl, M_TEMP); 1236 1237 EVENTHANDLER_INVOKE(group_change_event, groupname); 1238 1239 IFNET_WLOCK(); 1240 } 1241 IFNET_WUNLOCK(); 1242 } 1243 1244 /* 1245 * Stores all groups from an interface in memory pointed 1246 * to by data 1247 */ 1248 static int 1249 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1250 { 1251 int len, error; 1252 struct ifg_list *ifgl; 1253 struct ifg_req ifgrq, *ifgp; 1254 struct ifgroupreq *ifgr = data; 1255 1256 if (ifgr->ifgr_len == 0) { 1257 IF_ADDR_RLOCK(ifp); 1258 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1259 ifgr->ifgr_len += sizeof(struct ifg_req); 1260 IF_ADDR_RUNLOCK(ifp); 1261 return (0); 1262 } 1263 1264 len = ifgr->ifgr_len; 1265 ifgp = ifgr->ifgr_groups; 1266 /* XXX: wire */ 1267 IF_ADDR_RLOCK(ifp); 1268 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1269 if (len < sizeof(ifgrq)) { 1270 IF_ADDR_RUNLOCK(ifp); 1271 return (EINVAL); 1272 } 1273 bzero(&ifgrq, sizeof ifgrq); 1274 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1275 sizeof(ifgrq.ifgrq_group)); 1276 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1277 IF_ADDR_RUNLOCK(ifp); 1278 return (error); 1279 } 1280 len -= sizeof(ifgrq); 1281 ifgp++; 1282 } 1283 IF_ADDR_RUNLOCK(ifp); 1284 1285 return (0); 1286 } 1287 1288 /* 1289 * Stores all members of a group in memory pointed to by data 1290 */ 1291 static int 1292 if_getgroupmembers(struct ifgroupreq *data) 1293 { 1294 struct ifgroupreq *ifgr = data; 1295 struct ifg_group *ifg; 1296 struct ifg_member *ifgm; 1297 struct ifg_req ifgrq, *ifgp; 1298 int len, error; 1299 1300 IFNET_RLOCK(); 1301 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1302 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1303 break; 1304 if (ifg == NULL) { 1305 IFNET_RUNLOCK(); 1306 return (ENOENT); 1307 } 1308 1309 if (ifgr->ifgr_len == 0) { 1310 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1311 ifgr->ifgr_len += sizeof(ifgrq); 1312 IFNET_RUNLOCK(); 1313 return (0); 1314 } 1315 1316 len = ifgr->ifgr_len; 1317 ifgp = ifgr->ifgr_groups; 1318 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1319 if (len < sizeof(ifgrq)) { 1320 IFNET_RUNLOCK(); 1321 return (EINVAL); 1322 } 1323 bzero(&ifgrq, sizeof ifgrq); 1324 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1325 sizeof(ifgrq.ifgrq_member)); 1326 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1327 IFNET_RUNLOCK(); 1328 return (error); 1329 } 1330 len -= sizeof(ifgrq); 1331 ifgp++; 1332 } 1333 IFNET_RUNLOCK(); 1334 1335 return (0); 1336 } 1337 1338 /* 1339 * Delete Routes for a Network Interface 1340 * 1341 * Called for each routing entry via the rnh->rnh_walktree() call above 1342 * to delete all route entries referencing a detaching network interface. 1343 * 1344 * Arguments: 1345 * rn pointer to node in the routing table 1346 * arg argument passed to rnh->rnh_walktree() - detaching interface 1347 * 1348 * Returns: 1349 * 0 successful 1350 * errno failed - reason indicated 1351 * 1352 */ 1353 static int 1354 if_rtdel(struct radix_node *rn, void *arg) 1355 { 1356 struct rtentry *rt = (struct rtentry *)rn; 1357 struct ifnet *ifp = arg; 1358 int err; 1359 1360 if (rt->rt_ifp == ifp) { 1361 1362 /* 1363 * Protect (sorta) against walktree recursion problems 1364 * with cloned routes 1365 */ 1366 if ((rt->rt_flags & RTF_UP) == 0) 1367 return (0); 1368 1369 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1370 rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED, 1371 (struct rtentry **) NULL, rt->rt_fibnum); 1372 if (err) { 1373 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1374 } 1375 } 1376 1377 return (0); 1378 } 1379 1380 /* 1381 * Wrapper functions for struct ifnet address list locking macros. These are 1382 * used by kernel modules to avoid encoding programming interface or binary 1383 * interface assumptions that may be violated when kernel-internal locking 1384 * approaches change. 1385 */ 1386 void 1387 if_addr_rlock(struct ifnet *ifp) 1388 { 1389 1390 IF_ADDR_RLOCK(ifp); 1391 } 1392 1393 void 1394 if_addr_runlock(struct ifnet *ifp) 1395 { 1396 1397 IF_ADDR_RUNLOCK(ifp); 1398 } 1399 1400 void 1401 if_maddr_rlock(struct ifnet *ifp) 1402 { 1403 1404 IF_ADDR_RLOCK(ifp); 1405 } 1406 1407 void 1408 if_maddr_runlock(struct ifnet *ifp) 1409 { 1410 1411 IF_ADDR_RUNLOCK(ifp); 1412 } 1413 1414 /* 1415 * Initialization, destruction and refcounting functions for ifaddrs. 1416 */ 1417 void 1418 ifa_init(struct ifaddr *ifa) 1419 { 1420 1421 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1422 refcount_init(&ifa->ifa_refcnt, 1); 1423 ifa->if_data.ifi_datalen = sizeof(ifa->if_data); 1424 } 1425 1426 void 1427 ifa_ref(struct ifaddr *ifa) 1428 { 1429 1430 refcount_acquire(&ifa->ifa_refcnt); 1431 } 1432 1433 void 1434 ifa_free(struct ifaddr *ifa) 1435 { 1436 1437 if (refcount_release(&ifa->ifa_refcnt)) { 1438 mtx_destroy(&ifa->ifa_mtx); 1439 free(ifa, M_IFADDR); 1440 } 1441 } 1442 1443 int 1444 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1445 { 1446 int error = 0; 1447 struct rtentry *rt = NULL; 1448 struct rt_addrinfo info; 1449 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1450 1451 bzero(&info, sizeof(info)); 1452 info.rti_ifp = V_loif; 1453 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1454 info.rti_info[RTAX_DST] = ia; 1455 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1456 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1457 1458 if (error == 0 && rt != NULL) { 1459 RT_LOCK(rt); 1460 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1461 ifa->ifa_ifp->if_type; 1462 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1463 ifa->ifa_ifp->if_index; 1464 RT_REMREF(rt); 1465 RT_UNLOCK(rt); 1466 } else if (error != 0) 1467 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error); 1468 1469 return (error); 1470 } 1471 1472 int 1473 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1474 { 1475 int error = 0; 1476 struct rt_addrinfo info; 1477 struct sockaddr_dl null_sdl; 1478 1479 bzero(&null_sdl, sizeof(null_sdl)); 1480 null_sdl.sdl_len = sizeof(null_sdl); 1481 null_sdl.sdl_family = AF_LINK; 1482 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1483 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1484 bzero(&info, sizeof(info)); 1485 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1486 info.rti_info[RTAX_DST] = ia; 1487 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1488 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1489 1490 if (error != 0) 1491 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error); 1492 1493 return (error); 1494 } 1495 1496 /* 1497 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1498 * structs used to represent other address families, it is necessary 1499 * to perform a different comparison. 1500 */ 1501 1502 #define sa_equal(a1, a2) \ 1503 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1504 1505 #define sa_dl_equal(a1, a2) \ 1506 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1507 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1508 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1509 LLADDR((struct sockaddr_dl *)(a2)), \ 1510 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1511 1512 /* 1513 * Locate an interface based on a complete address. 1514 */ 1515 /*ARGSUSED*/ 1516 static struct ifaddr * 1517 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1518 { 1519 struct ifnet *ifp; 1520 struct ifaddr *ifa; 1521 1522 IFNET_RLOCK_NOSLEEP(); 1523 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1524 IF_ADDR_RLOCK(ifp); 1525 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1526 if (ifa->ifa_addr->sa_family != addr->sa_family) 1527 continue; 1528 if (sa_equal(addr, ifa->ifa_addr)) { 1529 if (getref) 1530 ifa_ref(ifa); 1531 IF_ADDR_RUNLOCK(ifp); 1532 goto done; 1533 } 1534 /* IP6 doesn't have broadcast */ 1535 if ((ifp->if_flags & IFF_BROADCAST) && 1536 ifa->ifa_broadaddr && 1537 ifa->ifa_broadaddr->sa_len != 0 && 1538 sa_equal(ifa->ifa_broadaddr, addr)) { 1539 if (getref) 1540 ifa_ref(ifa); 1541 IF_ADDR_RUNLOCK(ifp); 1542 goto done; 1543 } 1544 } 1545 IF_ADDR_RUNLOCK(ifp); 1546 } 1547 ifa = NULL; 1548 done: 1549 IFNET_RUNLOCK_NOSLEEP(); 1550 return (ifa); 1551 } 1552 1553 struct ifaddr * 1554 ifa_ifwithaddr(struct sockaddr *addr) 1555 { 1556 1557 return (ifa_ifwithaddr_internal(addr, 1)); 1558 } 1559 1560 int 1561 ifa_ifwithaddr_check(struct sockaddr *addr) 1562 { 1563 1564 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1565 } 1566 1567 /* 1568 * Locate an interface based on the broadcast address. 1569 */ 1570 /* ARGSUSED */ 1571 struct ifaddr * 1572 ifa_ifwithbroadaddr(struct sockaddr *addr) 1573 { 1574 struct ifnet *ifp; 1575 struct ifaddr *ifa; 1576 1577 IFNET_RLOCK_NOSLEEP(); 1578 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1579 IF_ADDR_RLOCK(ifp); 1580 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1581 if (ifa->ifa_addr->sa_family != addr->sa_family) 1582 continue; 1583 if ((ifp->if_flags & IFF_BROADCAST) && 1584 ifa->ifa_broadaddr && 1585 ifa->ifa_broadaddr->sa_len != 0 && 1586 sa_equal(ifa->ifa_broadaddr, addr)) { 1587 ifa_ref(ifa); 1588 IF_ADDR_RUNLOCK(ifp); 1589 goto done; 1590 } 1591 } 1592 IF_ADDR_RUNLOCK(ifp); 1593 } 1594 ifa = NULL; 1595 done: 1596 IFNET_RUNLOCK_NOSLEEP(); 1597 return (ifa); 1598 } 1599 1600 /* 1601 * Locate the point to point interface with a given destination address. 1602 */ 1603 /*ARGSUSED*/ 1604 struct ifaddr * 1605 ifa_ifwithdstaddr(struct sockaddr *addr) 1606 { 1607 struct ifnet *ifp; 1608 struct ifaddr *ifa; 1609 1610 IFNET_RLOCK_NOSLEEP(); 1611 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1612 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1613 continue; 1614 IF_ADDR_RLOCK(ifp); 1615 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1616 if (ifa->ifa_addr->sa_family != addr->sa_family) 1617 continue; 1618 if (ifa->ifa_dstaddr != NULL && 1619 sa_equal(addr, ifa->ifa_dstaddr)) { 1620 ifa_ref(ifa); 1621 IF_ADDR_RUNLOCK(ifp); 1622 goto done; 1623 } 1624 } 1625 IF_ADDR_RUNLOCK(ifp); 1626 } 1627 ifa = NULL; 1628 done: 1629 IFNET_RUNLOCK_NOSLEEP(); 1630 return (ifa); 1631 } 1632 1633 /* 1634 * Find an interface on a specific network. If many, choice 1635 * is most specific found. 1636 */ 1637 struct ifaddr * 1638 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1639 { 1640 struct ifnet *ifp; 1641 struct ifaddr *ifa; 1642 struct ifaddr *ifa_maybe = NULL; 1643 u_int af = addr->sa_family; 1644 char *addr_data = addr->sa_data, *cplim; 1645 1646 /* 1647 * AF_LINK addresses can be looked up directly by their index number, 1648 * so do that if we can. 1649 */ 1650 if (af == AF_LINK) { 1651 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1652 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1653 return (ifaddr_byindex(sdl->sdl_index)); 1654 } 1655 1656 /* 1657 * Scan though each interface, looking for ones that have addresses 1658 * in this address family. Maintain a reference on ifa_maybe once 1659 * we find one, as we release the IF_ADDR_RLOCK() that kept it stable 1660 * when we move onto the next interface. 1661 */ 1662 IFNET_RLOCK_NOSLEEP(); 1663 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1664 IF_ADDR_RLOCK(ifp); 1665 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1666 char *cp, *cp2, *cp3; 1667 1668 if (ifa->ifa_addr->sa_family != af) 1669 next: continue; 1670 if (af == AF_INET && 1671 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1672 /* 1673 * This is a bit broken as it doesn't 1674 * take into account that the remote end may 1675 * be a single node in the network we are 1676 * looking for. 1677 * The trouble is that we don't know the 1678 * netmask for the remote end. 1679 */ 1680 if (ifa->ifa_dstaddr != NULL && 1681 sa_equal(addr, ifa->ifa_dstaddr)) { 1682 ifa_ref(ifa); 1683 IF_ADDR_RUNLOCK(ifp); 1684 goto done; 1685 } 1686 } else { 1687 /* 1688 * if we have a special address handler, 1689 * then use it instead of the generic one. 1690 */ 1691 if (ifa->ifa_claim_addr) { 1692 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1693 ifa_ref(ifa); 1694 IF_ADDR_RUNLOCK(ifp); 1695 goto done; 1696 } 1697 continue; 1698 } 1699 1700 /* 1701 * Scan all the bits in the ifa's address. 1702 * If a bit dissagrees with what we are 1703 * looking for, mask it with the netmask 1704 * to see if it really matters. 1705 * (A byte at a time) 1706 */ 1707 if (ifa->ifa_netmask == 0) 1708 continue; 1709 cp = addr_data; 1710 cp2 = ifa->ifa_addr->sa_data; 1711 cp3 = ifa->ifa_netmask->sa_data; 1712 cplim = ifa->ifa_netmask->sa_len 1713 + (char *)ifa->ifa_netmask; 1714 while (cp3 < cplim) 1715 if ((*cp++ ^ *cp2++) & *cp3++) 1716 goto next; /* next address! */ 1717 /* 1718 * If the netmask of what we just found 1719 * is more specific than what we had before 1720 * (if we had one) then remember the new one 1721 * before continuing to search 1722 * for an even better one. 1723 */ 1724 if (ifa_maybe == NULL || 1725 rn_refines((caddr_t)ifa->ifa_netmask, 1726 (caddr_t)ifa_maybe->ifa_netmask)) { 1727 if (ifa_maybe != NULL) 1728 ifa_free(ifa_maybe); 1729 ifa_maybe = ifa; 1730 ifa_ref(ifa_maybe); 1731 } 1732 } 1733 } 1734 IF_ADDR_RUNLOCK(ifp); 1735 } 1736 ifa = ifa_maybe; 1737 ifa_maybe = NULL; 1738 done: 1739 IFNET_RUNLOCK_NOSLEEP(); 1740 if (ifa_maybe != NULL) 1741 ifa_free(ifa_maybe); 1742 return (ifa); 1743 } 1744 1745 /* 1746 * Find an interface address specific to an interface best matching 1747 * a given address. 1748 */ 1749 struct ifaddr * 1750 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1751 { 1752 struct ifaddr *ifa; 1753 char *cp, *cp2, *cp3; 1754 char *cplim; 1755 struct ifaddr *ifa_maybe = NULL; 1756 u_int af = addr->sa_family; 1757 1758 if (af >= AF_MAX) 1759 return (NULL); 1760 IF_ADDR_RLOCK(ifp); 1761 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1762 if (ifa->ifa_addr->sa_family != af) 1763 continue; 1764 if (ifa_maybe == NULL) 1765 ifa_maybe = ifa; 1766 if (ifa->ifa_netmask == 0) { 1767 if (sa_equal(addr, ifa->ifa_addr) || 1768 (ifa->ifa_dstaddr && 1769 sa_equal(addr, ifa->ifa_dstaddr))) 1770 goto done; 1771 continue; 1772 } 1773 if (ifp->if_flags & IFF_POINTOPOINT) { 1774 if (sa_equal(addr, ifa->ifa_dstaddr)) 1775 goto done; 1776 } else { 1777 cp = addr->sa_data; 1778 cp2 = ifa->ifa_addr->sa_data; 1779 cp3 = ifa->ifa_netmask->sa_data; 1780 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1781 for (; cp3 < cplim; cp3++) 1782 if ((*cp++ ^ *cp2++) & *cp3) 1783 break; 1784 if (cp3 == cplim) 1785 goto done; 1786 } 1787 } 1788 ifa = ifa_maybe; 1789 done: 1790 if (ifa != NULL) 1791 ifa_ref(ifa); 1792 IF_ADDR_RUNLOCK(ifp); 1793 return (ifa); 1794 } 1795 1796 #include <net/if_llatbl.h> 1797 1798 /* 1799 * Default action when installing a route with a Link Level gateway. 1800 * Lookup an appropriate real ifa to point to. 1801 * This should be moved to /sys/net/link.c eventually. 1802 */ 1803 static void 1804 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1805 { 1806 struct ifaddr *ifa, *oifa; 1807 struct sockaddr *dst; 1808 struct ifnet *ifp; 1809 1810 RT_LOCK_ASSERT(rt); 1811 1812 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1813 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1814 return; 1815 ifa = ifaof_ifpforaddr(dst, ifp); 1816 if (ifa) { 1817 oifa = rt->rt_ifa; 1818 rt->rt_ifa = ifa; 1819 ifa_free(oifa); 1820 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1821 ifa->ifa_rtrequest(cmd, rt, info); 1822 } 1823 } 1824 1825 /* 1826 * Mark an interface down and notify protocols of 1827 * the transition. 1828 * NOTE: must be called at splnet or eqivalent. 1829 */ 1830 static void 1831 if_unroute(struct ifnet *ifp, int flag, int fam) 1832 { 1833 struct ifaddr *ifa; 1834 1835 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1836 1837 ifp->if_flags &= ~flag; 1838 getmicrotime(&ifp->if_lastchange); 1839 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1840 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1841 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1842 ifp->if_qflush(ifp); 1843 1844 if (ifp->if_carp) 1845 (*carp_linkstate_p)(ifp); 1846 rt_ifmsg(ifp); 1847 } 1848 1849 /* 1850 * Mark an interface up and notify protocols of 1851 * the transition. 1852 * NOTE: must be called at splnet or eqivalent. 1853 */ 1854 static void 1855 if_route(struct ifnet *ifp, int flag, int fam) 1856 { 1857 struct ifaddr *ifa; 1858 1859 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1860 1861 ifp->if_flags |= flag; 1862 getmicrotime(&ifp->if_lastchange); 1863 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1864 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1865 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1866 if (ifp->if_carp) 1867 (*carp_linkstate_p)(ifp); 1868 rt_ifmsg(ifp); 1869 #ifdef INET6 1870 in6_if_up(ifp); 1871 #endif 1872 } 1873 1874 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1875 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1876 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1877 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1878 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1879 int (*vlan_setcookie_p)(struct ifnet *, void *); 1880 void *(*vlan_cookie_p)(struct ifnet *); 1881 1882 /* 1883 * Handle a change in the interface link state. To avoid LORs 1884 * between driver lock and upper layer locks, as well as possible 1885 * recursions, we post event to taskqueue, and all job 1886 * is done in static do_link_state_change(). 1887 */ 1888 void 1889 if_link_state_change(struct ifnet *ifp, int link_state) 1890 { 1891 /* Return if state hasn't changed. */ 1892 if (ifp->if_link_state == link_state) 1893 return; 1894 1895 ifp->if_link_state = link_state; 1896 1897 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1898 } 1899 1900 static void 1901 do_link_state_change(void *arg, int pending) 1902 { 1903 struct ifnet *ifp = (struct ifnet *)arg; 1904 int link_state = ifp->if_link_state; 1905 CURVNET_SET(ifp->if_vnet); 1906 1907 /* Notify that the link state has changed. */ 1908 rt_ifmsg(ifp); 1909 if (ifp->if_vlantrunk != NULL) 1910 (*vlan_link_state_p)(ifp); 1911 1912 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1913 IFP2AC(ifp)->ac_netgraph != NULL) 1914 (*ng_ether_link_state_p)(ifp, link_state); 1915 if (ifp->if_carp) 1916 (*carp_linkstate_p)(ifp); 1917 if (ifp->if_bridge) 1918 (*bridge_linkstate_p)(ifp); 1919 if (ifp->if_lagg) 1920 (*lagg_linkstate_p)(ifp, link_state); 1921 1922 if (IS_DEFAULT_VNET(curvnet)) 1923 devctl_notify("IFNET", ifp->if_xname, 1924 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1925 NULL); 1926 if (pending > 1) 1927 if_printf(ifp, "%d link states coalesced\n", pending); 1928 if (log_link_state_change) 1929 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1930 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1931 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 1932 CURVNET_RESTORE(); 1933 } 1934 1935 /* 1936 * Mark an interface down and notify protocols of 1937 * the transition. 1938 * NOTE: must be called at splnet or eqivalent. 1939 */ 1940 void 1941 if_down(struct ifnet *ifp) 1942 { 1943 1944 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1945 } 1946 1947 /* 1948 * Mark an interface up and notify protocols of 1949 * the transition. 1950 * NOTE: must be called at splnet or eqivalent. 1951 */ 1952 void 1953 if_up(struct ifnet *ifp) 1954 { 1955 1956 if_route(ifp, IFF_UP, AF_UNSPEC); 1957 } 1958 1959 /* 1960 * Flush an interface queue. 1961 */ 1962 void 1963 if_qflush(struct ifnet *ifp) 1964 { 1965 struct mbuf *m, *n; 1966 struct ifaltq *ifq; 1967 1968 ifq = &ifp->if_snd; 1969 IFQ_LOCK(ifq); 1970 #ifdef ALTQ 1971 if (ALTQ_IS_ENABLED(ifq)) 1972 ALTQ_PURGE(ifq); 1973 #endif 1974 n = ifq->ifq_head; 1975 while ((m = n) != 0) { 1976 n = m->m_act; 1977 m_freem(m); 1978 } 1979 ifq->ifq_head = 0; 1980 ifq->ifq_tail = 0; 1981 ifq->ifq_len = 0; 1982 IFQ_UNLOCK(ifq); 1983 } 1984 1985 /* 1986 * Map interface name to interface structure pointer, with or without 1987 * returning a reference. 1988 */ 1989 struct ifnet * 1990 ifunit_ref(const char *name) 1991 { 1992 struct ifnet *ifp; 1993 1994 IFNET_RLOCK_NOSLEEP(); 1995 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1996 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 1997 !(ifp->if_flags & IFF_DYING)) 1998 break; 1999 } 2000 if (ifp != NULL) 2001 if_ref(ifp); 2002 IFNET_RUNLOCK_NOSLEEP(); 2003 return (ifp); 2004 } 2005 2006 struct ifnet * 2007 ifunit(const char *name) 2008 { 2009 struct ifnet *ifp; 2010 2011 IFNET_RLOCK_NOSLEEP(); 2012 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2013 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2014 break; 2015 } 2016 IFNET_RUNLOCK_NOSLEEP(); 2017 return (ifp); 2018 } 2019 2020 /* 2021 * Hardware specific interface ioctls. 2022 */ 2023 static int 2024 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2025 { 2026 struct ifreq *ifr; 2027 struct ifstat *ifs; 2028 int error = 0; 2029 int new_flags, temp_flags; 2030 size_t namelen, onamelen; 2031 size_t descrlen; 2032 char *descrbuf, *odescrbuf; 2033 char new_name[IFNAMSIZ]; 2034 struct ifaddr *ifa; 2035 struct sockaddr_dl *sdl; 2036 2037 ifr = (struct ifreq *)data; 2038 switch (cmd) { 2039 case SIOCGIFINDEX: 2040 ifr->ifr_index = ifp->if_index; 2041 break; 2042 2043 case SIOCGIFFLAGS: 2044 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2045 ifr->ifr_flags = temp_flags & 0xffff; 2046 ifr->ifr_flagshigh = temp_flags >> 16; 2047 break; 2048 2049 case SIOCGIFCAP: 2050 ifr->ifr_reqcap = ifp->if_capabilities; 2051 ifr->ifr_curcap = ifp->if_capenable; 2052 break; 2053 2054 #ifdef MAC 2055 case SIOCGIFMAC: 2056 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2057 break; 2058 #endif 2059 2060 case SIOCGIFMETRIC: 2061 ifr->ifr_metric = ifp->if_metric; 2062 break; 2063 2064 case SIOCGIFMTU: 2065 ifr->ifr_mtu = ifp->if_mtu; 2066 break; 2067 2068 case SIOCGIFPHYS: 2069 ifr->ifr_phys = ifp->if_physical; 2070 break; 2071 2072 case SIOCGIFDESCR: 2073 error = 0; 2074 sx_slock(&ifdescr_sx); 2075 if (ifp->if_description == NULL) 2076 error = ENOMSG; 2077 else { 2078 /* space for terminating nul */ 2079 descrlen = strlen(ifp->if_description) + 1; 2080 if (ifr->ifr_buffer.length < descrlen) 2081 ifr->ifr_buffer.buffer = NULL; 2082 else 2083 error = copyout(ifp->if_description, 2084 ifr->ifr_buffer.buffer, descrlen); 2085 ifr->ifr_buffer.length = descrlen; 2086 } 2087 sx_sunlock(&ifdescr_sx); 2088 break; 2089 2090 case SIOCSIFDESCR: 2091 error = priv_check(td, PRIV_NET_SETIFDESCR); 2092 if (error) 2093 return (error); 2094 2095 /* 2096 * Copy only (length-1) bytes to make sure that 2097 * if_description is always nul terminated. The 2098 * length parameter is supposed to count the 2099 * terminating nul in. 2100 */ 2101 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2102 return (ENAMETOOLONG); 2103 else if (ifr->ifr_buffer.length == 0) 2104 descrbuf = NULL; 2105 else { 2106 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2107 M_WAITOK | M_ZERO); 2108 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2109 ifr->ifr_buffer.length - 1); 2110 if (error) { 2111 free(descrbuf, M_IFDESCR); 2112 break; 2113 } 2114 } 2115 2116 sx_xlock(&ifdescr_sx); 2117 odescrbuf = ifp->if_description; 2118 ifp->if_description = descrbuf; 2119 sx_xunlock(&ifdescr_sx); 2120 2121 getmicrotime(&ifp->if_lastchange); 2122 free(odescrbuf, M_IFDESCR); 2123 break; 2124 2125 case SIOCGIFFIB: 2126 ifr->ifr_fib = ifp->if_fib; 2127 break; 2128 2129 case SIOCSIFFIB: 2130 error = priv_check(td, PRIV_NET_SETIFFIB); 2131 if (error) 2132 return (error); 2133 if (ifr->ifr_fib >= rt_numfibs) 2134 return (EINVAL); 2135 2136 ifp->if_fib = ifr->ifr_fib; 2137 break; 2138 2139 case SIOCSIFFLAGS: 2140 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2141 if (error) 2142 return (error); 2143 /* 2144 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2145 * check, so we don't need special handling here yet. 2146 */ 2147 new_flags = (ifr->ifr_flags & 0xffff) | 2148 (ifr->ifr_flagshigh << 16); 2149 if (ifp->if_flags & IFF_SMART) { 2150 /* Smart drivers twiddle their own routes */ 2151 } else if (ifp->if_flags & IFF_UP && 2152 (new_flags & IFF_UP) == 0) { 2153 int s = splimp(); 2154 if_down(ifp); 2155 splx(s); 2156 } else if (new_flags & IFF_UP && 2157 (ifp->if_flags & IFF_UP) == 0) { 2158 int s = splimp(); 2159 if_up(ifp); 2160 splx(s); 2161 } 2162 /* See if permanently promiscuous mode bit is about to flip */ 2163 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2164 if (new_flags & IFF_PPROMISC) 2165 ifp->if_flags |= IFF_PROMISC; 2166 else if (ifp->if_pcount == 0) 2167 ifp->if_flags &= ~IFF_PROMISC; 2168 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2169 ifp->if_xname, 2170 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2171 } 2172 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2173 (new_flags &~ IFF_CANTCHANGE); 2174 if (ifp->if_ioctl) { 2175 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2176 } 2177 getmicrotime(&ifp->if_lastchange); 2178 break; 2179 2180 case SIOCSIFCAP: 2181 error = priv_check(td, PRIV_NET_SETIFCAP); 2182 if (error) 2183 return (error); 2184 if (ifp->if_ioctl == NULL) 2185 return (EOPNOTSUPP); 2186 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2187 return (EINVAL); 2188 error = (*ifp->if_ioctl)(ifp, cmd, data); 2189 if (error == 0) 2190 getmicrotime(&ifp->if_lastchange); 2191 break; 2192 2193 #ifdef MAC 2194 case SIOCSIFMAC: 2195 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2196 break; 2197 #endif 2198 2199 case SIOCSIFNAME: 2200 error = priv_check(td, PRIV_NET_SETIFNAME); 2201 if (error) 2202 return (error); 2203 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2204 if (error != 0) 2205 return (error); 2206 if (new_name[0] == '\0') 2207 return (EINVAL); 2208 if (ifunit(new_name) != NULL) 2209 return (EEXIST); 2210 2211 /* 2212 * XXX: Locking. Nothing else seems to lock if_flags, 2213 * and there are numerous other races with the 2214 * ifunit() checks not being atomic with namespace 2215 * changes (renames, vmoves, if_attach, etc). 2216 */ 2217 ifp->if_flags |= IFF_RENAMING; 2218 2219 /* Announce the departure of the interface. */ 2220 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2221 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2222 2223 log(LOG_INFO, "%s: changing name to '%s'\n", 2224 ifp->if_xname, new_name); 2225 2226 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2227 ifa = ifp->if_addr; 2228 IFA_LOCK(ifa); 2229 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2230 namelen = strlen(new_name); 2231 onamelen = sdl->sdl_nlen; 2232 /* 2233 * Move the address if needed. This is safe because we 2234 * allocate space for a name of length IFNAMSIZ when we 2235 * create this in if_attach(). 2236 */ 2237 if (namelen != onamelen) { 2238 bcopy(sdl->sdl_data + onamelen, 2239 sdl->sdl_data + namelen, sdl->sdl_alen); 2240 } 2241 bcopy(new_name, sdl->sdl_data, namelen); 2242 sdl->sdl_nlen = namelen; 2243 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2244 bzero(sdl->sdl_data, onamelen); 2245 while (namelen != 0) 2246 sdl->sdl_data[--namelen] = 0xff; 2247 IFA_UNLOCK(ifa); 2248 2249 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2250 /* Announce the return of the interface. */ 2251 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2252 2253 ifp->if_flags &= ~IFF_RENAMING; 2254 break; 2255 2256 #ifdef VIMAGE 2257 case SIOCSIFVNET: 2258 error = priv_check(td, PRIV_NET_SETIFVNET); 2259 if (error) 2260 return (error); 2261 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2262 break; 2263 #endif 2264 2265 case SIOCSIFMETRIC: 2266 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2267 if (error) 2268 return (error); 2269 ifp->if_metric = ifr->ifr_metric; 2270 getmicrotime(&ifp->if_lastchange); 2271 break; 2272 2273 case SIOCSIFPHYS: 2274 error = priv_check(td, PRIV_NET_SETIFPHYS); 2275 if (error) 2276 return (error); 2277 if (ifp->if_ioctl == NULL) 2278 return (EOPNOTSUPP); 2279 error = (*ifp->if_ioctl)(ifp, cmd, data); 2280 if (error == 0) 2281 getmicrotime(&ifp->if_lastchange); 2282 break; 2283 2284 case SIOCSIFMTU: 2285 { 2286 u_long oldmtu = ifp->if_mtu; 2287 2288 error = priv_check(td, PRIV_NET_SETIFMTU); 2289 if (error) 2290 return (error); 2291 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2292 return (EINVAL); 2293 if (ifp->if_ioctl == NULL) 2294 return (EOPNOTSUPP); 2295 error = (*ifp->if_ioctl)(ifp, cmd, data); 2296 if (error == 0) { 2297 getmicrotime(&ifp->if_lastchange); 2298 rt_ifmsg(ifp); 2299 } 2300 /* 2301 * If the link MTU changed, do network layer specific procedure. 2302 */ 2303 if (ifp->if_mtu != oldmtu) { 2304 #ifdef INET6 2305 nd6_setmtu(ifp); 2306 #endif 2307 } 2308 break; 2309 } 2310 2311 case SIOCADDMULTI: 2312 case SIOCDELMULTI: 2313 if (cmd == SIOCADDMULTI) 2314 error = priv_check(td, PRIV_NET_ADDMULTI); 2315 else 2316 error = priv_check(td, PRIV_NET_DELMULTI); 2317 if (error) 2318 return (error); 2319 2320 /* Don't allow group membership on non-multicast interfaces. */ 2321 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2322 return (EOPNOTSUPP); 2323 2324 /* Don't let users screw up protocols' entries. */ 2325 if (ifr->ifr_addr.sa_family != AF_LINK) 2326 return (EINVAL); 2327 2328 if (cmd == SIOCADDMULTI) { 2329 struct ifmultiaddr *ifma; 2330 2331 /* 2332 * Userland is only permitted to join groups once 2333 * via the if_addmulti() KPI, because it cannot hold 2334 * struct ifmultiaddr * between calls. It may also 2335 * lose a race while we check if the membership 2336 * already exists. 2337 */ 2338 IF_ADDR_RLOCK(ifp); 2339 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2340 IF_ADDR_RUNLOCK(ifp); 2341 if (ifma != NULL) 2342 error = EADDRINUSE; 2343 else 2344 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2345 } else { 2346 error = if_delmulti(ifp, &ifr->ifr_addr); 2347 } 2348 if (error == 0) 2349 getmicrotime(&ifp->if_lastchange); 2350 break; 2351 2352 case SIOCSIFPHYADDR: 2353 case SIOCDIFPHYADDR: 2354 #ifdef INET6 2355 case SIOCSIFPHYADDR_IN6: 2356 #endif 2357 case SIOCSLIFPHYADDR: 2358 case SIOCSIFMEDIA: 2359 case SIOCSIFGENERIC: 2360 error = priv_check(td, PRIV_NET_HWIOCTL); 2361 if (error) 2362 return (error); 2363 if (ifp->if_ioctl == NULL) 2364 return (EOPNOTSUPP); 2365 error = (*ifp->if_ioctl)(ifp, cmd, data); 2366 if (error == 0) 2367 getmicrotime(&ifp->if_lastchange); 2368 break; 2369 2370 case SIOCGIFSTATUS: 2371 ifs = (struct ifstat *)data; 2372 ifs->ascii[0] = '\0'; 2373 2374 case SIOCGIFPSRCADDR: 2375 case SIOCGIFPDSTADDR: 2376 case SIOCGLIFPHYADDR: 2377 case SIOCGIFMEDIA: 2378 case SIOCGIFGENERIC: 2379 if (ifp->if_ioctl == NULL) 2380 return (EOPNOTSUPP); 2381 error = (*ifp->if_ioctl)(ifp, cmd, data); 2382 break; 2383 2384 case SIOCSIFLLADDR: 2385 error = priv_check(td, PRIV_NET_SETLLADDR); 2386 if (error) 2387 return (error); 2388 error = if_setlladdr(ifp, 2389 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2390 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2391 break; 2392 2393 case SIOCAIFGROUP: 2394 { 2395 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2396 2397 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2398 if (error) 2399 return (error); 2400 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2401 return (error); 2402 break; 2403 } 2404 2405 case SIOCGIFGROUP: 2406 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2407 return (error); 2408 break; 2409 2410 case SIOCDIFGROUP: 2411 { 2412 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2413 2414 error = priv_check(td, PRIV_NET_DELIFGROUP); 2415 if (error) 2416 return (error); 2417 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2418 return (error); 2419 break; 2420 } 2421 2422 default: 2423 error = ENOIOCTL; 2424 break; 2425 } 2426 return (error); 2427 } 2428 2429 #ifdef COMPAT_FREEBSD32 2430 struct ifconf32 { 2431 int32_t ifc_len; 2432 union { 2433 uint32_t ifcu_buf; 2434 uint32_t ifcu_req; 2435 } ifc_ifcu; 2436 }; 2437 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2438 #endif 2439 2440 /* 2441 * Interface ioctls. 2442 */ 2443 int 2444 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2445 { 2446 struct ifnet *ifp; 2447 struct ifreq *ifr; 2448 int error; 2449 int oif_flags; 2450 2451 CURVNET_SET(so->so_vnet); 2452 switch (cmd) { 2453 case SIOCGIFCONF: 2454 case OSIOCGIFCONF: 2455 error = ifconf(cmd, data); 2456 CURVNET_RESTORE(); 2457 return (error); 2458 2459 #ifdef COMPAT_FREEBSD32 2460 case SIOCGIFCONF32: 2461 { 2462 struct ifconf32 *ifc32; 2463 struct ifconf ifc; 2464 2465 ifc32 = (struct ifconf32 *)data; 2466 ifc.ifc_len = ifc32->ifc_len; 2467 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2468 2469 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2470 CURVNET_RESTORE(); 2471 if (error == 0) 2472 ifc32->ifc_len = ifc.ifc_len; 2473 return (error); 2474 } 2475 #endif 2476 } 2477 ifr = (struct ifreq *)data; 2478 2479 switch (cmd) { 2480 #ifdef VIMAGE 2481 case SIOCSIFRVNET: 2482 error = priv_check(td, PRIV_NET_SETIFVNET); 2483 if (error == 0) 2484 error = if_vmove_reclaim(td, ifr->ifr_name, 2485 ifr->ifr_jid); 2486 CURVNET_RESTORE(); 2487 return (error); 2488 #endif 2489 case SIOCIFCREATE: 2490 case SIOCIFCREATE2: 2491 error = priv_check(td, PRIV_NET_IFCREATE); 2492 if (error == 0) 2493 error = if_clone_create(ifr->ifr_name, 2494 sizeof(ifr->ifr_name), 2495 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2496 CURVNET_RESTORE(); 2497 return (error); 2498 case SIOCIFDESTROY: 2499 error = priv_check(td, PRIV_NET_IFDESTROY); 2500 if (error == 0) 2501 error = if_clone_destroy(ifr->ifr_name); 2502 CURVNET_RESTORE(); 2503 return (error); 2504 2505 case SIOCIFGCLONERS: 2506 error = if_clone_list((struct if_clonereq *)data); 2507 CURVNET_RESTORE(); 2508 return (error); 2509 case SIOCGIFGMEMB: 2510 error = if_getgroupmembers((struct ifgroupreq *)data); 2511 CURVNET_RESTORE(); 2512 return (error); 2513 #if defined(INET) || defined(INET6) 2514 case SIOCSVH: 2515 case SIOCGVH: 2516 if (carp_ioctl_p == NULL) 2517 error = EPROTONOSUPPORT; 2518 else 2519 error = (*carp_ioctl_p)(ifr, cmd, td); 2520 CURVNET_RESTORE(); 2521 return (error); 2522 #endif 2523 } 2524 2525 ifp = ifunit_ref(ifr->ifr_name); 2526 if (ifp == NULL) { 2527 CURVNET_RESTORE(); 2528 return (ENXIO); 2529 } 2530 2531 error = ifhwioctl(cmd, ifp, data, td); 2532 if (error != ENOIOCTL) { 2533 if_rele(ifp); 2534 CURVNET_RESTORE(); 2535 return (error); 2536 } 2537 2538 oif_flags = ifp->if_flags; 2539 if (so->so_proto == NULL) { 2540 if_rele(ifp); 2541 CURVNET_RESTORE(); 2542 return (EOPNOTSUPP); 2543 } 2544 #ifndef COMPAT_43 2545 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2546 data, 2547 ifp, td)); 2548 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2549 error = (*ifp->if_ioctl)(ifp, cmd, data); 2550 #else 2551 { 2552 u_long ocmd = cmd; 2553 2554 switch (cmd) { 2555 2556 case SIOCSIFDSTADDR: 2557 case SIOCSIFADDR: 2558 case SIOCSIFBRDADDR: 2559 case SIOCSIFNETMASK: 2560 #if BYTE_ORDER != BIG_ENDIAN 2561 if (ifr->ifr_addr.sa_family == 0 && 2562 ifr->ifr_addr.sa_len < 16) { 2563 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2564 ifr->ifr_addr.sa_len = 16; 2565 } 2566 #else 2567 if (ifr->ifr_addr.sa_len == 0) 2568 ifr->ifr_addr.sa_len = 16; 2569 #endif 2570 break; 2571 2572 case OSIOCGIFADDR: 2573 cmd = SIOCGIFADDR; 2574 break; 2575 2576 case OSIOCGIFDSTADDR: 2577 cmd = SIOCGIFDSTADDR; 2578 break; 2579 2580 case OSIOCGIFBRDADDR: 2581 cmd = SIOCGIFBRDADDR; 2582 break; 2583 2584 case OSIOCGIFNETMASK: 2585 cmd = SIOCGIFNETMASK; 2586 } 2587 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2588 cmd, 2589 data, 2590 ifp, td)); 2591 if (error == EOPNOTSUPP && ifp != NULL && 2592 ifp->if_ioctl != NULL) 2593 error = (*ifp->if_ioctl)(ifp, cmd, data); 2594 switch (ocmd) { 2595 2596 case OSIOCGIFADDR: 2597 case OSIOCGIFDSTADDR: 2598 case OSIOCGIFBRDADDR: 2599 case OSIOCGIFNETMASK: 2600 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2601 2602 } 2603 } 2604 #endif /* COMPAT_43 */ 2605 2606 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2607 #ifdef INET6 2608 if (ifp->if_flags & IFF_UP) { 2609 int s = splimp(); 2610 in6_if_up(ifp); 2611 splx(s); 2612 } 2613 #endif 2614 } 2615 if_rele(ifp); 2616 CURVNET_RESTORE(); 2617 return (error); 2618 } 2619 2620 /* 2621 * The code common to handling reference counted flags, 2622 * e.g., in ifpromisc() and if_allmulti(). 2623 * The "pflag" argument can specify a permanent mode flag to check, 2624 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2625 * 2626 * Only to be used on stack-owned flags, not driver-owned flags. 2627 */ 2628 static int 2629 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2630 { 2631 struct ifreq ifr; 2632 int error; 2633 int oldflags, oldcount; 2634 2635 /* Sanity checks to catch programming errors */ 2636 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2637 ("%s: setting driver-owned flag %d", __func__, flag)); 2638 2639 if (onswitch) 2640 KASSERT(*refcount >= 0, 2641 ("%s: increment negative refcount %d for flag %d", 2642 __func__, *refcount, flag)); 2643 else 2644 KASSERT(*refcount > 0, 2645 ("%s: decrement non-positive refcount %d for flag %d", 2646 __func__, *refcount, flag)); 2647 2648 /* In case this mode is permanent, just touch refcount */ 2649 if (ifp->if_flags & pflag) { 2650 *refcount += onswitch ? 1 : -1; 2651 return (0); 2652 } 2653 2654 /* Save ifnet parameters for if_ioctl() may fail */ 2655 oldcount = *refcount; 2656 oldflags = ifp->if_flags; 2657 2658 /* 2659 * See if we aren't the only and touching refcount is enough. 2660 * Actually toggle interface flag if we are the first or last. 2661 */ 2662 if (onswitch) { 2663 if ((*refcount)++) 2664 return (0); 2665 ifp->if_flags |= flag; 2666 } else { 2667 if (--(*refcount)) 2668 return (0); 2669 ifp->if_flags &= ~flag; 2670 } 2671 2672 /* Call down the driver since we've changed interface flags */ 2673 if (ifp->if_ioctl == NULL) { 2674 error = EOPNOTSUPP; 2675 goto recover; 2676 } 2677 ifr.ifr_flags = ifp->if_flags & 0xffff; 2678 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2679 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2680 if (error) 2681 goto recover; 2682 /* Notify userland that interface flags have changed */ 2683 rt_ifmsg(ifp); 2684 return (0); 2685 2686 recover: 2687 /* Recover after driver error */ 2688 *refcount = oldcount; 2689 ifp->if_flags = oldflags; 2690 return (error); 2691 } 2692 2693 /* 2694 * Set/clear promiscuous mode on interface ifp based on the truth value 2695 * of pswitch. The calls are reference counted so that only the first 2696 * "on" request actually has an effect, as does the final "off" request. 2697 * Results are undefined if the "off" and "on" requests are not matched. 2698 */ 2699 int 2700 ifpromisc(struct ifnet *ifp, int pswitch) 2701 { 2702 int error; 2703 int oldflags = ifp->if_flags; 2704 2705 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2706 &ifp->if_pcount, pswitch); 2707 /* If promiscuous mode status has changed, log a message */ 2708 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2709 log(LOG_INFO, "%s: promiscuous mode %s\n", 2710 ifp->if_xname, 2711 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2712 return (error); 2713 } 2714 2715 /* 2716 * Return interface configuration 2717 * of system. List may be used 2718 * in later ioctl's (above) to get 2719 * other information. 2720 */ 2721 /*ARGSUSED*/ 2722 static int 2723 ifconf(u_long cmd, caddr_t data) 2724 { 2725 struct ifconf *ifc = (struct ifconf *)data; 2726 struct ifnet *ifp; 2727 struct ifaddr *ifa; 2728 struct ifreq ifr; 2729 struct sbuf *sb; 2730 int error, full = 0, valid_len, max_len; 2731 2732 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2733 max_len = MAXPHYS - 1; 2734 2735 /* Prevent hostile input from being able to crash the system */ 2736 if (ifc->ifc_len <= 0) 2737 return (EINVAL); 2738 2739 again: 2740 if (ifc->ifc_len <= max_len) { 2741 max_len = ifc->ifc_len; 2742 full = 1; 2743 } 2744 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2745 max_len = 0; 2746 valid_len = 0; 2747 2748 IFNET_RLOCK(); 2749 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2750 int addrs; 2751 2752 /* 2753 * Zero the ifr_name buffer to make sure we don't 2754 * disclose the contents of the stack. 2755 */ 2756 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2757 2758 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2759 >= sizeof(ifr.ifr_name)) { 2760 sbuf_delete(sb); 2761 IFNET_RUNLOCK(); 2762 return (ENAMETOOLONG); 2763 } 2764 2765 addrs = 0; 2766 IF_ADDR_RLOCK(ifp); 2767 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2768 struct sockaddr *sa = ifa->ifa_addr; 2769 2770 if (prison_if(curthread->td_ucred, sa) != 0) 2771 continue; 2772 addrs++; 2773 #ifdef COMPAT_43 2774 if (cmd == OSIOCGIFCONF) { 2775 struct osockaddr *osa = 2776 (struct osockaddr *)&ifr.ifr_addr; 2777 ifr.ifr_addr = *sa; 2778 osa->sa_family = sa->sa_family; 2779 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2780 max_len += sizeof(ifr); 2781 } else 2782 #endif 2783 if (sa->sa_len <= sizeof(*sa)) { 2784 ifr.ifr_addr = *sa; 2785 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2786 max_len += sizeof(ifr); 2787 } else { 2788 sbuf_bcat(sb, &ifr, 2789 offsetof(struct ifreq, ifr_addr)); 2790 max_len += offsetof(struct ifreq, ifr_addr); 2791 sbuf_bcat(sb, sa, sa->sa_len); 2792 max_len += sa->sa_len; 2793 } 2794 2795 if (sbuf_error(sb) == 0) 2796 valid_len = sbuf_len(sb); 2797 } 2798 IF_ADDR_RUNLOCK(ifp); 2799 if (addrs == 0) { 2800 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2801 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2802 max_len += sizeof(ifr); 2803 2804 if (sbuf_error(sb) == 0) 2805 valid_len = sbuf_len(sb); 2806 } 2807 } 2808 IFNET_RUNLOCK(); 2809 2810 /* 2811 * If we didn't allocate enough space (uncommon), try again. If 2812 * we have already allocated as much space as we are allowed, 2813 * return what we've got. 2814 */ 2815 if (valid_len != max_len && !full) { 2816 sbuf_delete(sb); 2817 goto again; 2818 } 2819 2820 ifc->ifc_len = valid_len; 2821 sbuf_finish(sb); 2822 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2823 sbuf_delete(sb); 2824 return (error); 2825 } 2826 2827 /* 2828 * Just like ifpromisc(), but for all-multicast-reception mode. 2829 */ 2830 int 2831 if_allmulti(struct ifnet *ifp, int onswitch) 2832 { 2833 2834 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2835 } 2836 2837 struct ifmultiaddr * 2838 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2839 { 2840 struct ifmultiaddr *ifma; 2841 2842 IF_ADDR_LOCK_ASSERT(ifp); 2843 2844 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2845 if (sa->sa_family == AF_LINK) { 2846 if (sa_dl_equal(ifma->ifma_addr, sa)) 2847 break; 2848 } else { 2849 if (sa_equal(ifma->ifma_addr, sa)) 2850 break; 2851 } 2852 } 2853 2854 return ifma; 2855 } 2856 2857 /* 2858 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2859 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2860 * the ifnet multicast address list here, so the caller must do that and 2861 * other setup work (such as notifying the device driver). The reference 2862 * count is initialized to 1. 2863 */ 2864 static struct ifmultiaddr * 2865 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2866 int mflags) 2867 { 2868 struct ifmultiaddr *ifma; 2869 struct sockaddr *dupsa; 2870 2871 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2872 M_ZERO); 2873 if (ifma == NULL) 2874 return (NULL); 2875 2876 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2877 if (dupsa == NULL) { 2878 free(ifma, M_IFMADDR); 2879 return (NULL); 2880 } 2881 bcopy(sa, dupsa, sa->sa_len); 2882 ifma->ifma_addr = dupsa; 2883 2884 ifma->ifma_ifp = ifp; 2885 ifma->ifma_refcount = 1; 2886 ifma->ifma_protospec = NULL; 2887 2888 if (llsa == NULL) { 2889 ifma->ifma_lladdr = NULL; 2890 return (ifma); 2891 } 2892 2893 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2894 if (dupsa == NULL) { 2895 free(ifma->ifma_addr, M_IFMADDR); 2896 free(ifma, M_IFMADDR); 2897 return (NULL); 2898 } 2899 bcopy(llsa, dupsa, llsa->sa_len); 2900 ifma->ifma_lladdr = dupsa; 2901 2902 return (ifma); 2903 } 2904 2905 /* 2906 * if_freemulti: free ifmultiaddr structure and possibly attached related 2907 * addresses. The caller is responsible for implementing reference 2908 * counting, notifying the driver, handling routing messages, and releasing 2909 * any dependent link layer state. 2910 */ 2911 static void 2912 if_freemulti(struct ifmultiaddr *ifma) 2913 { 2914 2915 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2916 ifma->ifma_refcount)); 2917 KASSERT(ifma->ifma_protospec == NULL, 2918 ("if_freemulti: protospec not NULL")); 2919 2920 if (ifma->ifma_lladdr != NULL) 2921 free(ifma->ifma_lladdr, M_IFMADDR); 2922 free(ifma->ifma_addr, M_IFMADDR); 2923 free(ifma, M_IFMADDR); 2924 } 2925 2926 /* 2927 * Register an additional multicast address with a network interface. 2928 * 2929 * - If the address is already present, bump the reference count on the 2930 * address and return. 2931 * - If the address is not link-layer, look up a link layer address. 2932 * - Allocate address structures for one or both addresses, and attach to the 2933 * multicast address list on the interface. If automatically adding a link 2934 * layer address, the protocol address will own a reference to the link 2935 * layer address, to be freed when it is freed. 2936 * - Notify the network device driver of an addition to the multicast address 2937 * list. 2938 * 2939 * 'sa' points to caller-owned memory with the desired multicast address. 2940 * 2941 * 'retifma' will be used to return a pointer to the resulting multicast 2942 * address reference, if desired. 2943 */ 2944 int 2945 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2946 struct ifmultiaddr **retifma) 2947 { 2948 struct ifmultiaddr *ifma, *ll_ifma; 2949 struct sockaddr *llsa; 2950 int error; 2951 2952 /* 2953 * If the address is already present, return a new reference to it; 2954 * otherwise, allocate storage and set up a new address. 2955 */ 2956 IF_ADDR_WLOCK(ifp); 2957 ifma = if_findmulti(ifp, sa); 2958 if (ifma != NULL) { 2959 ifma->ifma_refcount++; 2960 if (retifma != NULL) 2961 *retifma = ifma; 2962 IF_ADDR_WUNLOCK(ifp); 2963 return (0); 2964 } 2965 2966 /* 2967 * The address isn't already present; resolve the protocol address 2968 * into a link layer address, and then look that up, bump its 2969 * refcount or allocate an ifma for that also. If 'llsa' was 2970 * returned, we will need to free it later. 2971 */ 2972 llsa = NULL; 2973 ll_ifma = NULL; 2974 if (ifp->if_resolvemulti != NULL) { 2975 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2976 if (error) 2977 goto unlock_out; 2978 } 2979 2980 /* 2981 * Allocate the new address. Don't hook it up yet, as we may also 2982 * need to allocate a link layer multicast address. 2983 */ 2984 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2985 if (ifma == NULL) { 2986 error = ENOMEM; 2987 goto free_llsa_out; 2988 } 2989 2990 /* 2991 * If a link layer address is found, we'll need to see if it's 2992 * already present in the address list, or allocate is as well. 2993 * When this block finishes, the link layer address will be on the 2994 * list. 2995 */ 2996 if (llsa != NULL) { 2997 ll_ifma = if_findmulti(ifp, llsa); 2998 if (ll_ifma == NULL) { 2999 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3000 if (ll_ifma == NULL) { 3001 --ifma->ifma_refcount; 3002 if_freemulti(ifma); 3003 error = ENOMEM; 3004 goto free_llsa_out; 3005 } 3006 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3007 ifma_link); 3008 } else 3009 ll_ifma->ifma_refcount++; 3010 ifma->ifma_llifma = ll_ifma; 3011 } 3012 3013 /* 3014 * We now have a new multicast address, ifma, and possibly a new or 3015 * referenced link layer address. Add the primary address to the 3016 * ifnet address list. 3017 */ 3018 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3019 3020 if (retifma != NULL) 3021 *retifma = ifma; 3022 3023 /* 3024 * Must generate the message while holding the lock so that 'ifma' 3025 * pointer is still valid. 3026 */ 3027 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3028 IF_ADDR_WUNLOCK(ifp); 3029 3030 /* 3031 * We are certain we have added something, so call down to the 3032 * interface to let them know about it. 3033 */ 3034 if (ifp->if_ioctl != NULL) { 3035 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3036 } 3037 3038 if (llsa != NULL) 3039 free(llsa, M_IFMADDR); 3040 3041 return (0); 3042 3043 free_llsa_out: 3044 if (llsa != NULL) 3045 free(llsa, M_IFMADDR); 3046 3047 unlock_out: 3048 IF_ADDR_WUNLOCK(ifp); 3049 return (error); 3050 } 3051 3052 /* 3053 * Delete a multicast group membership by network-layer group address. 3054 * 3055 * Returns ENOENT if the entry could not be found. If ifp no longer 3056 * exists, results are undefined. This entry point should only be used 3057 * from subsystems which do appropriate locking to hold ifp for the 3058 * duration of the call. 3059 * Network-layer protocol domains must use if_delmulti_ifma(). 3060 */ 3061 int 3062 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3063 { 3064 struct ifmultiaddr *ifma; 3065 int lastref; 3066 #ifdef INVARIANTS 3067 struct ifnet *oifp; 3068 3069 IFNET_RLOCK_NOSLEEP(); 3070 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3071 if (ifp == oifp) 3072 break; 3073 if (ifp != oifp) 3074 ifp = NULL; 3075 IFNET_RUNLOCK_NOSLEEP(); 3076 3077 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3078 #endif 3079 if (ifp == NULL) 3080 return (ENOENT); 3081 3082 IF_ADDR_WLOCK(ifp); 3083 lastref = 0; 3084 ifma = if_findmulti(ifp, sa); 3085 if (ifma != NULL) 3086 lastref = if_delmulti_locked(ifp, ifma, 0); 3087 IF_ADDR_WUNLOCK(ifp); 3088 3089 if (ifma == NULL) 3090 return (ENOENT); 3091 3092 if (lastref && ifp->if_ioctl != NULL) { 3093 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3094 } 3095 3096 return (0); 3097 } 3098 3099 /* 3100 * Delete all multicast group membership for an interface. 3101 * Should be used to quickly flush all multicast filters. 3102 */ 3103 void 3104 if_delallmulti(struct ifnet *ifp) 3105 { 3106 struct ifmultiaddr *ifma; 3107 struct ifmultiaddr *next; 3108 3109 IF_ADDR_WLOCK(ifp); 3110 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3111 if_delmulti_locked(ifp, ifma, 0); 3112 IF_ADDR_WUNLOCK(ifp); 3113 } 3114 3115 /* 3116 * Delete a multicast group membership by group membership pointer. 3117 * Network-layer protocol domains must use this routine. 3118 * 3119 * It is safe to call this routine if the ifp disappeared. 3120 */ 3121 void 3122 if_delmulti_ifma(struct ifmultiaddr *ifma) 3123 { 3124 struct ifnet *ifp; 3125 int lastref; 3126 3127 ifp = ifma->ifma_ifp; 3128 #ifdef DIAGNOSTIC 3129 if (ifp == NULL) { 3130 printf("%s: ifma_ifp seems to be detached\n", __func__); 3131 } else { 3132 struct ifnet *oifp; 3133 3134 IFNET_RLOCK_NOSLEEP(); 3135 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3136 if (ifp == oifp) 3137 break; 3138 if (ifp != oifp) { 3139 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3140 ifp = NULL; 3141 } 3142 IFNET_RUNLOCK_NOSLEEP(); 3143 } 3144 #endif 3145 /* 3146 * If and only if the ifnet instance exists: Acquire the address lock. 3147 */ 3148 if (ifp != NULL) 3149 IF_ADDR_WLOCK(ifp); 3150 3151 lastref = if_delmulti_locked(ifp, ifma, 0); 3152 3153 if (ifp != NULL) { 3154 /* 3155 * If and only if the ifnet instance exists: 3156 * Release the address lock. 3157 * If the group was left: update the hardware hash filter. 3158 */ 3159 IF_ADDR_WUNLOCK(ifp); 3160 if (lastref && ifp->if_ioctl != NULL) { 3161 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3162 } 3163 } 3164 } 3165 3166 /* 3167 * Perform deletion of network-layer and/or link-layer multicast address. 3168 * 3169 * Return 0 if the reference count was decremented. 3170 * Return 1 if the final reference was released, indicating that the 3171 * hardware hash filter should be reprogrammed. 3172 */ 3173 static int 3174 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3175 { 3176 struct ifmultiaddr *ll_ifma; 3177 3178 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3179 KASSERT(ifma->ifma_ifp == ifp, 3180 ("%s: inconsistent ifp %p", __func__, ifp)); 3181 IF_ADDR_WLOCK_ASSERT(ifp); 3182 } 3183 3184 ifp = ifma->ifma_ifp; 3185 3186 /* 3187 * If the ifnet is detaching, null out references to ifnet, 3188 * so that upper protocol layers will notice, and not attempt 3189 * to obtain locks for an ifnet which no longer exists. The 3190 * routing socket announcement must happen before the ifnet 3191 * instance is detached from the system. 3192 */ 3193 if (detaching) { 3194 #ifdef DIAGNOSTIC 3195 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3196 #endif 3197 /* 3198 * ifp may already be nulled out if we are being reentered 3199 * to delete the ll_ifma. 3200 */ 3201 if (ifp != NULL) { 3202 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3203 ifma->ifma_ifp = NULL; 3204 } 3205 } 3206 3207 if (--ifma->ifma_refcount > 0) 3208 return 0; 3209 3210 /* 3211 * If this ifma is a network-layer ifma, a link-layer ifma may 3212 * have been associated with it. Release it first if so. 3213 */ 3214 ll_ifma = ifma->ifma_llifma; 3215 if (ll_ifma != NULL) { 3216 KASSERT(ifma->ifma_lladdr != NULL, 3217 ("%s: llifma w/o lladdr", __func__)); 3218 if (detaching) 3219 ll_ifma->ifma_ifp = NULL; /* XXX */ 3220 if (--ll_ifma->ifma_refcount == 0) { 3221 if (ifp != NULL) { 3222 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3223 ifma_link); 3224 } 3225 if_freemulti(ll_ifma); 3226 } 3227 } 3228 3229 if (ifp != NULL) 3230 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3231 3232 if_freemulti(ifma); 3233 3234 /* 3235 * The last reference to this instance of struct ifmultiaddr 3236 * was released; the hardware should be notified of this change. 3237 */ 3238 return 1; 3239 } 3240 3241 /* 3242 * Set the link layer address on an interface. 3243 * 3244 * At this time we only support certain types of interfaces, 3245 * and we don't allow the length of the address to change. 3246 */ 3247 int 3248 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3249 { 3250 struct sockaddr_dl *sdl; 3251 struct ifaddr *ifa; 3252 struct ifreq ifr; 3253 3254 IF_ADDR_RLOCK(ifp); 3255 ifa = ifp->if_addr; 3256 if (ifa == NULL) { 3257 IF_ADDR_RUNLOCK(ifp); 3258 return (EINVAL); 3259 } 3260 ifa_ref(ifa); 3261 IF_ADDR_RUNLOCK(ifp); 3262 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3263 if (sdl == NULL) { 3264 ifa_free(ifa); 3265 return (EINVAL); 3266 } 3267 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3268 ifa_free(ifa); 3269 return (EINVAL); 3270 } 3271 switch (ifp->if_type) { 3272 case IFT_ETHER: 3273 case IFT_FDDI: 3274 case IFT_XETHER: 3275 case IFT_ISO88025: 3276 case IFT_L2VLAN: 3277 case IFT_BRIDGE: 3278 case IFT_ARCNET: 3279 case IFT_IEEE8023ADLAG: 3280 case IFT_IEEE80211: 3281 bcopy(lladdr, LLADDR(sdl), len); 3282 ifa_free(ifa); 3283 break; 3284 default: 3285 ifa_free(ifa); 3286 return (ENODEV); 3287 } 3288 3289 /* 3290 * If the interface is already up, we need 3291 * to re-init it in order to reprogram its 3292 * address filter. 3293 */ 3294 if ((ifp->if_flags & IFF_UP) != 0) { 3295 if (ifp->if_ioctl) { 3296 ifp->if_flags &= ~IFF_UP; 3297 ifr.ifr_flags = ifp->if_flags & 0xffff; 3298 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3299 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3300 ifp->if_flags |= IFF_UP; 3301 ifr.ifr_flags = ifp->if_flags & 0xffff; 3302 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3303 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3304 } 3305 #ifdef INET 3306 /* 3307 * Also send gratuitous ARPs to notify other nodes about 3308 * the address change. 3309 */ 3310 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3311 if (ifa->ifa_addr->sa_family == AF_INET) 3312 arp_ifinit(ifp, ifa); 3313 } 3314 #endif 3315 } 3316 return (0); 3317 } 3318 3319 /* 3320 * The name argument must be a pointer to storage which will last as 3321 * long as the interface does. For physical devices, the result of 3322 * device_get_name(dev) is a good choice and for pseudo-devices a 3323 * static string works well. 3324 */ 3325 void 3326 if_initname(struct ifnet *ifp, const char *name, int unit) 3327 { 3328 ifp->if_dname = name; 3329 ifp->if_dunit = unit; 3330 if (unit != IF_DUNIT_NONE) 3331 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3332 else 3333 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3334 } 3335 3336 int 3337 if_printf(struct ifnet *ifp, const char * fmt, ...) 3338 { 3339 va_list ap; 3340 int retval; 3341 3342 retval = printf("%s: ", ifp->if_xname); 3343 va_start(ap, fmt); 3344 retval += vprintf(fmt, ap); 3345 va_end(ap); 3346 return (retval); 3347 } 3348 3349 void 3350 if_start(struct ifnet *ifp) 3351 { 3352 3353 (*(ifp)->if_start)(ifp); 3354 } 3355 3356 /* 3357 * Backwards compatibility interface for drivers 3358 * that have not implemented it 3359 */ 3360 static int 3361 if_transmit(struct ifnet *ifp, struct mbuf *m) 3362 { 3363 int error; 3364 3365 IFQ_HANDOFF(ifp, m, error); 3366 return (error); 3367 } 3368 3369 int 3370 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3371 { 3372 int active = 0; 3373 3374 IF_LOCK(ifq); 3375 if (_IF_QFULL(ifq)) { 3376 _IF_DROP(ifq); 3377 IF_UNLOCK(ifq); 3378 m_freem(m); 3379 return (0); 3380 } 3381 if (ifp != NULL) { 3382 ifp->if_obytes += m->m_pkthdr.len + adjust; 3383 if (m->m_flags & (M_BCAST|M_MCAST)) 3384 ifp->if_omcasts++; 3385 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3386 } 3387 _IF_ENQUEUE(ifq, m); 3388 IF_UNLOCK(ifq); 3389 if (ifp != NULL && !active) 3390 (*(ifp)->if_start)(ifp); 3391 return (1); 3392 } 3393 3394 void 3395 if_register_com_alloc(u_char type, 3396 if_com_alloc_t *a, if_com_free_t *f) 3397 { 3398 3399 KASSERT(if_com_alloc[type] == NULL, 3400 ("if_register_com_alloc: %d already registered", type)); 3401 KASSERT(if_com_free[type] == NULL, 3402 ("if_register_com_alloc: %d free already registered", type)); 3403 3404 if_com_alloc[type] = a; 3405 if_com_free[type] = f; 3406 } 3407 3408 void 3409 if_deregister_com_alloc(u_char type) 3410 { 3411 3412 KASSERT(if_com_alloc[type] != NULL, 3413 ("if_deregister_com_alloc: %d not registered", type)); 3414 KASSERT(if_com_free[type] != NULL, 3415 ("if_deregister_com_alloc: %d free not registered", type)); 3416 if_com_alloc[type] = NULL; 3417 if_com_free[type] = NULL; 3418 } 3419