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