1 /*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD$ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/conf.h> 40 #include <sys/malloc.h> 41 #include <sys/sbuf.h> 42 #include <sys/bus.h> 43 #include <sys/mbuf.h> 44 #include <sys/systm.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/protosw.h> 50 #include <sys/kernel.h> 51 #include <sys/lock.h> 52 #include <sys/refcount.h> 53 #include <sys/module.h> 54 #include <sys/rwlock.h> 55 #include <sys/sockio.h> 56 #include <sys/syslog.h> 57 #include <sys/sysctl.h> 58 #include <sys/taskqueue.h> 59 #include <sys/domain.h> 60 #include <sys/jail.h> 61 #include <sys/priv.h> 62 63 #include <machine/stdarg.h> 64 #include <vm/uma.h> 65 66 #include <net/if.h> 67 #include <net/if_arp.h> 68 #include <net/if_clone.h> 69 #include <net/if_dl.h> 70 #include <net/if_types.h> 71 #include <net/if_var.h> 72 #include <net/radix.h> 73 #include <net/route.h> 74 #include <net/vnet.h> 75 76 #if defined(INET) || defined(INET6) 77 #include <netinet/in.h> 78 #include <netinet/in_var.h> 79 #include <netinet/ip.h> 80 #include <netinet/ip_carp.h> 81 #ifdef INET 82 #include <netinet/if_ether.h> 83 #endif /* INET */ 84 #ifdef INET6 85 #include <netinet6/in6_var.h> 86 #include <netinet6/in6_ifattach.h> 87 #endif /* INET6 */ 88 #endif /* INET || INET6 */ 89 90 #include <security/mac/mac_framework.h> 91 92 #ifdef COMPAT_FREEBSD32 93 #include <sys/mount.h> 94 #include <compat/freebsd32/freebsd32.h> 95 #endif 96 97 struct ifindex_entry { 98 struct ifnet *ife_ifnet; 99 }; 100 101 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 102 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 103 104 TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen); 105 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 106 &ifqmaxlen, 0, "max send queue size"); 107 108 /* Log link state change events */ 109 static int log_link_state_change = 1; 110 111 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 112 &log_link_state_change, 0, 113 "log interface link state change events"); 114 115 /* Interface description */ 116 static unsigned int ifdescr_maxlen = 1024; 117 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 118 &ifdescr_maxlen, 0, 119 "administrative maximum length for interface description"); 120 121 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 122 123 /* global sx for non-critical path ifdescr */ 124 static struct sx ifdescr_sx; 125 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 126 127 void (*bridge_linkstate_p)(struct ifnet *ifp); 128 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 129 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 130 /* These are external hooks for CARP. */ 131 void (*carp_linkstate_p)(struct ifnet *ifp); 132 void (*carp_demote_adj_p)(int, char *); 133 int (*carp_master_p)(struct ifaddr *); 134 #if defined(INET) || defined(INET6) 135 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 136 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 137 const struct sockaddr *sa); 138 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 139 int (*carp_attach_p)(struct ifaddr *, int); 140 void (*carp_detach_p)(struct ifaddr *); 141 #endif 142 #ifdef INET 143 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 144 #endif 145 #ifdef INET6 146 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 147 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 148 const struct in6_addr *taddr); 149 #endif 150 151 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 152 153 /* 154 * XXX: Style; these should be sorted alphabetically, and unprototyped 155 * static functions should be prototyped. Currently they are sorted by 156 * declaration order. 157 */ 158 static void if_attachdomain(void *); 159 static void if_attachdomain1(struct ifnet *); 160 static int ifconf(u_long, caddr_t); 161 static void if_freemulti(struct ifmultiaddr *); 162 static void if_init(void *); 163 static void if_grow(void); 164 static void if_route(struct ifnet *, int flag, int fam); 165 static int if_setflag(struct ifnet *, int, int, int *, int); 166 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 167 static void if_unroute(struct ifnet *, int flag, int fam); 168 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 169 static int if_rtdel(struct radix_node *, void *); 170 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 171 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 172 static void do_link_state_change(void *, int); 173 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 174 static int if_getgroupmembers(struct ifgroupreq *); 175 static void if_delgroups(struct ifnet *); 176 static void if_attach_internal(struct ifnet *, int); 177 static void if_detach_internal(struct ifnet *, int); 178 179 #ifdef INET6 180 /* 181 * XXX: declare here to avoid to include many inet6 related files.. 182 * should be more generalized? 183 */ 184 extern void nd6_setmtu(struct ifnet *); 185 #endif 186 187 VNET_DEFINE(int, if_index); 188 int ifqmaxlen = IFQ_MAXLEN; 189 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 190 VNET_DEFINE(struct ifgrouphead, ifg_head); 191 192 static VNET_DEFINE(int, if_indexlim) = 8; 193 194 /* Table of ifnet by index. */ 195 VNET_DEFINE(struct ifindex_entry *, ifindex_table); 196 197 #define V_if_indexlim VNET(if_indexlim) 198 #define V_ifindex_table VNET(ifindex_table) 199 200 /* 201 * The global network interface list (V_ifnet) and related state (such as 202 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 203 * an rwlock. Either may be acquired shared to stablize the list, but both 204 * must be acquired writable to modify the list. This model allows us to 205 * both stablize the interface list during interrupt thread processing, but 206 * also to stablize it over long-running ioctls, without introducing priority 207 * inversions and deadlocks. 208 */ 209 struct rwlock ifnet_rwlock; 210 struct sx ifnet_sxlock; 211 212 /* 213 * The allocation of network interfaces is a rather non-atomic affair; we 214 * need to select an index before we are ready to expose the interface for 215 * use, so will use this pointer value to indicate reservation. 216 */ 217 #define IFNET_HOLD (void *)(uintptr_t)(-1) 218 219 static if_com_alloc_t *if_com_alloc[256]; 220 static if_com_free_t *if_com_free[256]; 221 222 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 223 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 224 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 225 226 struct ifnet * 227 ifnet_byindex_locked(u_short idx) 228 { 229 230 if (idx > V_if_index) 231 return (NULL); 232 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 233 return (NULL); 234 return (V_ifindex_table[idx].ife_ifnet); 235 } 236 237 struct ifnet * 238 ifnet_byindex(u_short idx) 239 { 240 struct ifnet *ifp; 241 242 IFNET_RLOCK_NOSLEEP(); 243 ifp = ifnet_byindex_locked(idx); 244 IFNET_RUNLOCK_NOSLEEP(); 245 return (ifp); 246 } 247 248 struct ifnet * 249 ifnet_byindex_ref(u_short idx) 250 { 251 struct ifnet *ifp; 252 253 IFNET_RLOCK_NOSLEEP(); 254 ifp = ifnet_byindex_locked(idx); 255 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 256 IFNET_RUNLOCK_NOSLEEP(); 257 return (NULL); 258 } 259 if_ref(ifp); 260 IFNET_RUNLOCK_NOSLEEP(); 261 return (ifp); 262 } 263 264 /* 265 * Allocate an ifindex array entry; return 0 on success or an error on 266 * failure. 267 */ 268 static int 269 ifindex_alloc_locked(u_short *idxp) 270 { 271 u_short idx; 272 273 IFNET_WLOCK_ASSERT(); 274 275 retry: 276 /* 277 * Try to find an empty slot below V_if_index. If we fail, take the 278 * next slot. 279 */ 280 for (idx = 1; idx <= V_if_index; idx++) { 281 if (V_ifindex_table[idx].ife_ifnet == NULL) 282 break; 283 } 284 285 /* Catch if_index overflow. */ 286 if (idx < 1) 287 return (ENOSPC); 288 if (idx >= V_if_indexlim) { 289 if_grow(); 290 goto retry; 291 } 292 if (idx > V_if_index) 293 V_if_index = idx; 294 *idxp = idx; 295 return (0); 296 } 297 298 static void 299 ifindex_free_locked(u_short idx) 300 { 301 302 IFNET_WLOCK_ASSERT(); 303 304 V_ifindex_table[idx].ife_ifnet = NULL; 305 while (V_if_index > 0 && 306 V_ifindex_table[V_if_index].ife_ifnet == NULL) 307 V_if_index--; 308 } 309 310 static void 311 ifindex_free(u_short idx) 312 { 313 314 IFNET_WLOCK(); 315 ifindex_free_locked(idx); 316 IFNET_WUNLOCK(); 317 } 318 319 static void 320 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 321 { 322 323 IFNET_WLOCK_ASSERT(); 324 325 V_ifindex_table[idx].ife_ifnet = ifp; 326 } 327 328 static void 329 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 330 { 331 332 IFNET_WLOCK(); 333 ifnet_setbyindex_locked(idx, ifp); 334 IFNET_WUNLOCK(); 335 } 336 337 struct ifaddr * 338 ifaddr_byindex(u_short idx) 339 { 340 struct ifaddr *ifa; 341 342 IFNET_RLOCK_NOSLEEP(); 343 ifa = ifnet_byindex_locked(idx)->if_addr; 344 if (ifa != NULL) 345 ifa_ref(ifa); 346 IFNET_RUNLOCK_NOSLEEP(); 347 return (ifa); 348 } 349 350 /* 351 * Network interface utility routines. 352 * 353 * Routines with ifa_ifwith* names take sockaddr *'s as 354 * parameters. 355 */ 356 357 static void 358 vnet_if_init(const void *unused __unused) 359 { 360 361 TAILQ_INIT(&V_ifnet); 362 TAILQ_INIT(&V_ifg_head); 363 IFNET_WLOCK(); 364 if_grow(); /* create initial table */ 365 IFNET_WUNLOCK(); 366 vnet_if_clone_init(); 367 } 368 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 369 NULL); 370 371 /* ARGSUSED*/ 372 static void 373 if_init(void *dummy __unused) 374 { 375 376 IFNET_LOCK_INIT(); 377 if_clone_init(); 378 } 379 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 380 381 382 #ifdef VIMAGE 383 static void 384 vnet_if_uninit(const void *unused __unused) 385 { 386 387 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 388 "not empty", __func__, __LINE__, &V_ifnet)); 389 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 390 "not empty", __func__, __LINE__, &V_ifg_head)); 391 392 free((caddr_t)V_ifindex_table, M_IFNET); 393 } 394 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 395 vnet_if_uninit, NULL); 396 #endif 397 398 static void 399 if_grow(void) 400 { 401 int oldlim; 402 u_int n; 403 struct ifindex_entry *e; 404 405 IFNET_WLOCK_ASSERT(); 406 oldlim = V_if_indexlim; 407 IFNET_WUNLOCK(); 408 n = (oldlim << 1) * sizeof(*e); 409 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 410 IFNET_WLOCK(); 411 if (V_if_indexlim != oldlim) { 412 free(e, M_IFNET); 413 return; 414 } 415 if (V_ifindex_table != NULL) { 416 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 417 free((caddr_t)V_ifindex_table, M_IFNET); 418 } 419 V_if_indexlim <<= 1; 420 V_ifindex_table = e; 421 } 422 423 /* 424 * Allocate a struct ifnet and an index for an interface. A layer 2 425 * common structure will also be allocated if an allocation routine is 426 * registered for the passed type. 427 */ 428 struct ifnet * 429 if_alloc(u_char type) 430 { 431 struct ifnet *ifp; 432 u_short idx; 433 434 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 435 IFNET_WLOCK(); 436 if (ifindex_alloc_locked(&idx) != 0) { 437 IFNET_WUNLOCK(); 438 free(ifp, M_IFNET); 439 return (NULL); 440 } 441 ifnet_setbyindex_locked(idx, IFNET_HOLD); 442 IFNET_WUNLOCK(); 443 ifp->if_index = idx; 444 ifp->if_type = type; 445 ifp->if_alloctype = type; 446 if (if_com_alloc[type] != NULL) { 447 ifp->if_l2com = if_com_alloc[type](type, ifp); 448 if (ifp->if_l2com == NULL) { 449 free(ifp, M_IFNET); 450 ifindex_free(idx); 451 return (NULL); 452 } 453 } 454 455 IF_ADDR_LOCK_INIT(ifp); 456 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 457 ifp->if_afdata_initialized = 0; 458 IF_AFDATA_LOCK_INIT(ifp); 459 TAILQ_INIT(&ifp->if_addrhead); 460 TAILQ_INIT(&ifp->if_multiaddrs); 461 TAILQ_INIT(&ifp->if_groups); 462 #ifdef MAC 463 mac_ifnet_init(ifp); 464 #endif 465 ifq_init(&ifp->if_snd, ifp); 466 467 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 468 ifnet_setbyindex(ifp->if_index, ifp); 469 return (ifp); 470 } 471 472 /* 473 * Do the actual work of freeing a struct ifnet, and layer 2 common 474 * structure. This call is made when the last reference to an 475 * interface is released. 476 */ 477 static void 478 if_free_internal(struct ifnet *ifp) 479 { 480 481 KASSERT((ifp->if_flags & IFF_DYING), 482 ("if_free_internal: interface not dying")); 483 484 if (if_com_free[ifp->if_alloctype] != NULL) 485 if_com_free[ifp->if_alloctype](ifp->if_l2com, 486 ifp->if_alloctype); 487 488 #ifdef MAC 489 mac_ifnet_destroy(ifp); 490 #endif /* MAC */ 491 if (ifp->if_description != NULL) 492 free(ifp->if_description, M_IFDESCR); 493 IF_AFDATA_DESTROY(ifp); 494 IF_ADDR_LOCK_DESTROY(ifp); 495 ifq_delete(&ifp->if_snd); 496 free(ifp, M_IFNET); 497 } 498 499 /* 500 * Deregister an interface and free the associated storage. 501 */ 502 void 503 if_free(struct ifnet *ifp) 504 { 505 506 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 507 508 CURVNET_SET_QUIET(ifp->if_vnet); 509 IFNET_WLOCK(); 510 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 511 ("%s: freeing unallocated ifnet", ifp->if_xname)); 512 513 ifindex_free_locked(ifp->if_index); 514 IFNET_WUNLOCK(); 515 516 if (refcount_release(&ifp->if_refcount)) 517 if_free_internal(ifp); 518 CURVNET_RESTORE(); 519 } 520 521 /* 522 * Interfaces to keep an ifnet type-stable despite the possibility of the 523 * driver calling if_free(). If there are additional references, we defer 524 * freeing the underlying data structure. 525 */ 526 void 527 if_ref(struct ifnet *ifp) 528 { 529 530 /* We don't assert the ifnet list lock here, but arguably should. */ 531 refcount_acquire(&ifp->if_refcount); 532 } 533 534 void 535 if_rele(struct ifnet *ifp) 536 { 537 538 if (!refcount_release(&ifp->if_refcount)) 539 return; 540 if_free_internal(ifp); 541 } 542 543 void 544 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 545 { 546 547 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 548 549 if (ifq->ifq_maxlen == 0) 550 ifq->ifq_maxlen = ifqmaxlen; 551 552 ifq->altq_type = 0; 553 ifq->altq_disc = NULL; 554 ifq->altq_flags &= ALTQF_CANTCHANGE; 555 ifq->altq_tbr = NULL; 556 ifq->altq_ifp = ifp; 557 } 558 559 void 560 ifq_delete(struct ifaltq *ifq) 561 { 562 mtx_destroy(&ifq->ifq_mtx); 563 } 564 565 /* 566 * Perform generic interface initalization tasks and attach the interface 567 * to the list of "active" interfaces. If vmove flag is set on entry 568 * to if_attach_internal(), perform only a limited subset of initialization 569 * tasks, given that we are moving from one vnet to another an ifnet which 570 * has already been fully initialized. 571 * 572 * XXX: 573 * - The decision to return void and thus require this function to 574 * succeed is questionable. 575 * - We should probably do more sanity checking. For instance we don't 576 * do anything to insure if_xname is unique or non-empty. 577 */ 578 void 579 if_attach(struct ifnet *ifp) 580 { 581 582 if_attach_internal(ifp, 0); 583 } 584 585 static void 586 if_attach_internal(struct ifnet *ifp, int vmove) 587 { 588 unsigned socksize, ifasize; 589 int namelen, masklen; 590 struct sockaddr_dl *sdl; 591 struct ifaddr *ifa; 592 593 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 594 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 595 ifp->if_xname); 596 597 #ifdef VIMAGE 598 ifp->if_vnet = curvnet; 599 if (ifp->if_home_vnet == NULL) 600 ifp->if_home_vnet = curvnet; 601 #endif 602 603 if_addgroup(ifp, IFG_ALL); 604 605 getmicrotime(&ifp->if_lastchange); 606 ifp->if_data.ifi_epoch = time_uptime; 607 ifp->if_data.ifi_datalen = sizeof(struct if_data); 608 609 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 610 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 611 ("transmit and qflush must both either be set or both be NULL")); 612 if (ifp->if_transmit == NULL) { 613 ifp->if_transmit = if_transmit; 614 ifp->if_qflush = if_qflush; 615 } 616 617 if (!vmove) { 618 #ifdef MAC 619 mac_ifnet_create(ifp); 620 #endif 621 622 /* 623 * Create a Link Level name for this device. 624 */ 625 namelen = strlen(ifp->if_xname); 626 /* 627 * Always save enough space for any possiable name so we 628 * can do a rename in place later. 629 */ 630 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 631 socksize = masklen + ifp->if_addrlen; 632 if (socksize < sizeof(*sdl)) 633 socksize = sizeof(*sdl); 634 socksize = roundup2(socksize, sizeof(long)); 635 ifasize = sizeof(*ifa) + 2 * socksize; 636 ifa = ifa_alloc(ifasize, M_WAITOK); 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 #if defined(INET) || defined(INET6) 658 /* Initialize to max value. */ 659 if (ifp->if_hw_tsomax == 0) 660 ifp->if_hw_tsomax = IP_MAXPACKET; 661 KASSERT(ifp->if_hw_tsomax <= IP_MAXPACKET && 662 ifp->if_hw_tsomax >= IP_MAXPACKET / 8, 663 ("%s: tsomax outside of range", __func__)); 664 #endif 665 } 666 #ifdef VIMAGE 667 else { 668 /* 669 * Update the interface index in the link layer address 670 * of the interface. 671 */ 672 for (ifa = ifp->if_addr; ifa != NULL; 673 ifa = TAILQ_NEXT(ifa, ifa_link)) { 674 if (ifa->ifa_addr->sa_family == AF_LINK) { 675 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 676 sdl->sdl_index = ifp->if_index; 677 } 678 } 679 } 680 #endif 681 682 IFNET_WLOCK(); 683 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 684 #ifdef VIMAGE 685 curvnet->vnet_ifcnt++; 686 #endif 687 IFNET_WUNLOCK(); 688 689 if (domain_init_status >= 2) 690 if_attachdomain1(ifp); 691 692 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 693 if (IS_DEFAULT_VNET(curvnet)) 694 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 695 696 /* Announce the interface. */ 697 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 698 } 699 700 static void 701 if_attachdomain(void *dummy) 702 { 703 struct ifnet *ifp; 704 705 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 706 if_attachdomain1(ifp); 707 } 708 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 709 if_attachdomain, NULL); 710 711 static void 712 if_attachdomain1(struct ifnet *ifp) 713 { 714 struct domain *dp; 715 716 /* 717 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 718 * cannot lock ifp->if_afdata initialization, entirely. 719 */ 720 if (IF_AFDATA_TRYLOCK(ifp) == 0) 721 return; 722 if (ifp->if_afdata_initialized >= domain_init_status) { 723 IF_AFDATA_UNLOCK(ifp); 724 log(LOG_WARNING, "%s called more than once on %s\n", 725 __func__, ifp->if_xname); 726 return; 727 } 728 ifp->if_afdata_initialized = domain_init_status; 729 IF_AFDATA_UNLOCK(ifp); 730 731 /* address family dependent data region */ 732 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 733 for (dp = domains; dp; dp = dp->dom_next) { 734 if (dp->dom_ifattach) 735 ifp->if_afdata[dp->dom_family] = 736 (*dp->dom_ifattach)(ifp); 737 } 738 } 739 740 /* 741 * Remove any unicast or broadcast network addresses from an interface. 742 */ 743 void 744 if_purgeaddrs(struct ifnet *ifp) 745 { 746 struct ifaddr *ifa, *next; 747 748 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 749 if (ifa->ifa_addr->sa_family == AF_LINK) 750 continue; 751 #ifdef INET 752 /* XXX: Ugly!! ad hoc just for INET */ 753 if (ifa->ifa_addr->sa_family == AF_INET) { 754 struct ifaliasreq ifr; 755 756 bzero(&ifr, sizeof(ifr)); 757 ifr.ifra_addr = *ifa->ifa_addr; 758 if (ifa->ifa_dstaddr) 759 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 760 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 761 NULL) == 0) 762 continue; 763 } 764 #endif /* INET */ 765 #ifdef INET6 766 if (ifa->ifa_addr->sa_family == AF_INET6) { 767 in6_purgeaddr(ifa); 768 /* ifp_addrhead is already updated */ 769 continue; 770 } 771 #endif /* INET6 */ 772 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 773 ifa_free(ifa); 774 } 775 } 776 777 /* 778 * Remove any multicast network addresses from an interface when an ifnet 779 * is going away. 780 */ 781 static void 782 if_purgemaddrs(struct ifnet *ifp) 783 { 784 struct ifmultiaddr *ifma; 785 struct ifmultiaddr *next; 786 787 IF_ADDR_WLOCK(ifp); 788 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 789 if_delmulti_locked(ifp, ifma, 1); 790 IF_ADDR_WUNLOCK(ifp); 791 } 792 793 /* 794 * Detach an interface, removing it from the list of "active" interfaces. 795 * If vmove flag is set on entry to if_detach_internal(), perform only a 796 * limited subset of cleanup tasks, given that we are moving an ifnet from 797 * one vnet to another, where it must be fully operational. 798 * 799 * XXXRW: There are some significant questions about event ordering, and 800 * how to prevent things from starting to use the interface during detach. 801 */ 802 void 803 if_detach(struct ifnet *ifp) 804 { 805 806 CURVNET_SET_QUIET(ifp->if_vnet); 807 if_detach_internal(ifp, 0); 808 CURVNET_RESTORE(); 809 } 810 811 static void 812 if_detach_internal(struct ifnet *ifp, int vmove) 813 { 814 struct ifaddr *ifa; 815 struct radix_node_head *rnh; 816 int i, j; 817 struct domain *dp; 818 struct ifnet *iter; 819 int found = 0; 820 821 IFNET_WLOCK(); 822 TAILQ_FOREACH(iter, &V_ifnet, if_link) 823 if (iter == ifp) { 824 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 825 found = 1; 826 break; 827 } 828 #ifdef VIMAGE 829 if (found) 830 curvnet->vnet_ifcnt--; 831 #endif 832 IFNET_WUNLOCK(); 833 if (!found) { 834 if (vmove) 835 panic("%s: ifp=%p not on the ifnet tailq %p", 836 __func__, ifp, &V_ifnet); 837 else 838 return; /* XXX this should panic as well? */ 839 } 840 841 /* 842 * Remove/wait for pending events. 843 */ 844 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 845 846 /* 847 * Remove routes and flush queues. 848 */ 849 if_down(ifp); 850 #ifdef ALTQ 851 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 852 altq_disable(&ifp->if_snd); 853 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 854 altq_detach(&ifp->if_snd); 855 #endif 856 857 if_purgeaddrs(ifp); 858 859 #ifdef INET 860 in_ifdetach(ifp); 861 #endif 862 863 #ifdef INET6 864 /* 865 * Remove all IPv6 kernel structs related to ifp. This should be done 866 * before removing routing entries below, since IPv6 interface direct 867 * routes are expected to be removed by the IPv6-specific kernel API. 868 * Otherwise, the kernel will detect some inconsistency and bark it. 869 */ 870 in6_ifdetach(ifp); 871 #endif 872 if_purgemaddrs(ifp); 873 874 if (!vmove) { 875 /* 876 * Prevent further calls into the device driver via ifnet. 877 */ 878 if_dead(ifp); 879 880 /* 881 * Remove link ifaddr pointer and maybe decrement if_index. 882 * Clean up all addresses. 883 */ 884 ifp->if_addr = NULL; 885 886 /* We can now free link ifaddr. */ 887 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 888 ifa = TAILQ_FIRST(&ifp->if_addrhead); 889 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 890 ifa_free(ifa); 891 } 892 } 893 894 /* 895 * Delete all remaining routes using this interface 896 * Unfortuneatly the only way to do this is to slog through 897 * the entire routing table looking for routes which point 898 * to this interface...oh well... 899 */ 900 for (i = 1; i <= AF_MAX; i++) { 901 for (j = 0; j < rt_numfibs; j++) { 902 rnh = rt_tables_get_rnh(j, i); 903 if (rnh == NULL) 904 continue; 905 RADIX_NODE_HEAD_LOCK(rnh); 906 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 907 RADIX_NODE_HEAD_UNLOCK(rnh); 908 } 909 } 910 911 /* Announce that the interface is gone. */ 912 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 913 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 914 if (IS_DEFAULT_VNET(curvnet)) 915 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 916 if_delgroups(ifp); 917 918 /* 919 * We cannot hold the lock over dom_ifdetach calls as they might 920 * sleep, for example trying to drain a callout, thus open up the 921 * theoretical race with re-attaching. 922 */ 923 IF_AFDATA_LOCK(ifp); 924 i = ifp->if_afdata_initialized; 925 ifp->if_afdata_initialized = 0; 926 IF_AFDATA_UNLOCK(ifp); 927 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 928 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 929 (*dp->dom_ifdetach)(ifp, 930 ifp->if_afdata[dp->dom_family]); 931 } 932 } 933 934 #ifdef VIMAGE 935 /* 936 * if_vmove() performs a limited version of if_detach() in current 937 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 938 * An attempt is made to shrink if_index in current vnet, find an 939 * unused if_index in target vnet and calls if_grow() if necessary, 940 * and finally find an unused if_xname for the target vnet. 941 */ 942 void 943 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 944 { 945 u_short idx; 946 947 /* 948 * Detach from current vnet, but preserve LLADDR info, do not 949 * mark as dead etc. so that the ifnet can be reattached later. 950 */ 951 if_detach_internal(ifp, 1); 952 953 /* 954 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 955 * the if_index for that vnet if possible. 956 * 957 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 958 * or we'd lock on one vnet and unlock on another. 959 */ 960 IFNET_WLOCK(); 961 ifindex_free_locked(ifp->if_index); 962 IFNET_WUNLOCK(); 963 964 /* 965 * Perform interface-specific reassignment tasks, if provided by 966 * the driver. 967 */ 968 if (ifp->if_reassign != NULL) 969 ifp->if_reassign(ifp, new_vnet, NULL); 970 971 /* 972 * Switch to the context of the target vnet. 973 */ 974 CURVNET_SET_QUIET(new_vnet); 975 976 IFNET_WLOCK(); 977 if (ifindex_alloc_locked(&idx) != 0) { 978 IFNET_WUNLOCK(); 979 panic("if_index overflow"); 980 } 981 ifp->if_index = idx; 982 ifnet_setbyindex_locked(ifp->if_index, ifp); 983 IFNET_WUNLOCK(); 984 985 if_attach_internal(ifp, 1); 986 987 CURVNET_RESTORE(); 988 } 989 990 /* 991 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 992 */ 993 static int 994 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 995 { 996 struct prison *pr; 997 struct ifnet *difp; 998 999 /* Try to find the prison within our visibility. */ 1000 sx_slock(&allprison_lock); 1001 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1002 sx_sunlock(&allprison_lock); 1003 if (pr == NULL) 1004 return (ENXIO); 1005 prison_hold_locked(pr); 1006 mtx_unlock(&pr->pr_mtx); 1007 1008 /* Do not try to move the iface from and to the same prison. */ 1009 if (pr->pr_vnet == ifp->if_vnet) { 1010 prison_free(pr); 1011 return (EEXIST); 1012 } 1013 1014 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1015 /* XXX Lock interfaces to avoid races. */ 1016 CURVNET_SET_QUIET(pr->pr_vnet); 1017 difp = ifunit(ifname); 1018 CURVNET_RESTORE(); 1019 if (difp != NULL) { 1020 prison_free(pr); 1021 return (EEXIST); 1022 } 1023 1024 /* Move the interface into the child jail/vnet. */ 1025 if_vmove(ifp, pr->pr_vnet); 1026 1027 /* Report the new if_xname back to the userland. */ 1028 sprintf(ifname, "%s", ifp->if_xname); 1029 1030 prison_free(pr); 1031 return (0); 1032 } 1033 1034 static int 1035 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1036 { 1037 struct prison *pr; 1038 struct vnet *vnet_dst; 1039 struct ifnet *ifp; 1040 1041 /* Try to find the prison within our visibility. */ 1042 sx_slock(&allprison_lock); 1043 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1044 sx_sunlock(&allprison_lock); 1045 if (pr == NULL) 1046 return (ENXIO); 1047 prison_hold_locked(pr); 1048 mtx_unlock(&pr->pr_mtx); 1049 1050 /* Make sure the named iface exists in the source prison/vnet. */ 1051 CURVNET_SET(pr->pr_vnet); 1052 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1053 if (ifp == NULL) { 1054 CURVNET_RESTORE(); 1055 prison_free(pr); 1056 return (ENXIO); 1057 } 1058 1059 /* Do not try to move the iface from and to the same prison. */ 1060 vnet_dst = TD_TO_VNET(td); 1061 if (vnet_dst == ifp->if_vnet) { 1062 CURVNET_RESTORE(); 1063 prison_free(pr); 1064 return (EEXIST); 1065 } 1066 1067 /* Get interface back from child jail/vnet. */ 1068 if_vmove(ifp, vnet_dst); 1069 CURVNET_RESTORE(); 1070 1071 /* Report the new if_xname back to the userland. */ 1072 sprintf(ifname, "%s", ifp->if_xname); 1073 1074 prison_free(pr); 1075 return (0); 1076 } 1077 #endif /* VIMAGE */ 1078 1079 /* 1080 * Add a group to an interface 1081 */ 1082 int 1083 if_addgroup(struct ifnet *ifp, const char *groupname) 1084 { 1085 struct ifg_list *ifgl; 1086 struct ifg_group *ifg = NULL; 1087 struct ifg_member *ifgm; 1088 int new = 0; 1089 1090 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1091 groupname[strlen(groupname) - 1] <= '9') 1092 return (EINVAL); 1093 1094 IFNET_WLOCK(); 1095 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1096 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1097 IFNET_WUNLOCK(); 1098 return (EEXIST); 1099 } 1100 1101 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1102 M_NOWAIT)) == NULL) { 1103 IFNET_WUNLOCK(); 1104 return (ENOMEM); 1105 } 1106 1107 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1108 M_TEMP, M_NOWAIT)) == NULL) { 1109 free(ifgl, M_TEMP); 1110 IFNET_WUNLOCK(); 1111 return (ENOMEM); 1112 } 1113 1114 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1115 if (!strcmp(ifg->ifg_group, groupname)) 1116 break; 1117 1118 if (ifg == NULL) { 1119 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1120 M_TEMP, M_NOWAIT)) == NULL) { 1121 free(ifgl, M_TEMP); 1122 free(ifgm, M_TEMP); 1123 IFNET_WUNLOCK(); 1124 return (ENOMEM); 1125 } 1126 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1127 ifg->ifg_refcnt = 0; 1128 TAILQ_INIT(&ifg->ifg_members); 1129 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1130 new = 1; 1131 } 1132 1133 ifg->ifg_refcnt++; 1134 ifgl->ifgl_group = ifg; 1135 ifgm->ifgm_ifp = ifp; 1136 1137 IF_ADDR_WLOCK(ifp); 1138 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1139 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1140 IF_ADDR_WUNLOCK(ifp); 1141 1142 IFNET_WUNLOCK(); 1143 1144 if (new) 1145 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1146 EVENTHANDLER_INVOKE(group_change_event, groupname); 1147 1148 return (0); 1149 } 1150 1151 /* 1152 * Remove a group from an interface 1153 */ 1154 int 1155 if_delgroup(struct ifnet *ifp, const char *groupname) 1156 { 1157 struct ifg_list *ifgl; 1158 struct ifg_member *ifgm; 1159 1160 IFNET_WLOCK(); 1161 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1162 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1163 break; 1164 if (ifgl == NULL) { 1165 IFNET_WUNLOCK(); 1166 return (ENOENT); 1167 } 1168 1169 IF_ADDR_WLOCK(ifp); 1170 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1171 IF_ADDR_WUNLOCK(ifp); 1172 1173 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1174 if (ifgm->ifgm_ifp == ifp) 1175 break; 1176 1177 if (ifgm != NULL) { 1178 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1179 free(ifgm, M_TEMP); 1180 } 1181 1182 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1183 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1184 IFNET_WUNLOCK(); 1185 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1186 free(ifgl->ifgl_group, M_TEMP); 1187 } else 1188 IFNET_WUNLOCK(); 1189 1190 free(ifgl, M_TEMP); 1191 1192 EVENTHANDLER_INVOKE(group_change_event, groupname); 1193 1194 return (0); 1195 } 1196 1197 /* 1198 * Remove an interface from all groups 1199 */ 1200 static void 1201 if_delgroups(struct ifnet *ifp) 1202 { 1203 struct ifg_list *ifgl; 1204 struct ifg_member *ifgm; 1205 char groupname[IFNAMSIZ]; 1206 1207 IFNET_WLOCK(); 1208 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1209 ifgl = TAILQ_FIRST(&ifp->if_groups); 1210 1211 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1212 1213 IF_ADDR_WLOCK(ifp); 1214 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1215 IF_ADDR_WUNLOCK(ifp); 1216 1217 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1218 if (ifgm->ifgm_ifp == ifp) 1219 break; 1220 1221 if (ifgm != NULL) { 1222 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1223 ifgm_next); 1224 free(ifgm, M_TEMP); 1225 } 1226 1227 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1228 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1229 IFNET_WUNLOCK(); 1230 EVENTHANDLER_INVOKE(group_detach_event, 1231 ifgl->ifgl_group); 1232 free(ifgl->ifgl_group, M_TEMP); 1233 } else 1234 IFNET_WUNLOCK(); 1235 1236 free(ifgl, M_TEMP); 1237 1238 EVENTHANDLER_INVOKE(group_change_event, groupname); 1239 1240 IFNET_WLOCK(); 1241 } 1242 IFNET_WUNLOCK(); 1243 } 1244 1245 /* 1246 * Stores all groups from an interface in memory pointed 1247 * to by data 1248 */ 1249 static int 1250 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1251 { 1252 int len, error; 1253 struct ifg_list *ifgl; 1254 struct ifg_req ifgrq, *ifgp; 1255 struct ifgroupreq *ifgr = data; 1256 1257 if (ifgr->ifgr_len == 0) { 1258 IF_ADDR_RLOCK(ifp); 1259 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1260 ifgr->ifgr_len += sizeof(struct ifg_req); 1261 IF_ADDR_RUNLOCK(ifp); 1262 return (0); 1263 } 1264 1265 len = ifgr->ifgr_len; 1266 ifgp = ifgr->ifgr_groups; 1267 /* XXX: wire */ 1268 IF_ADDR_RLOCK(ifp); 1269 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1270 if (len < sizeof(ifgrq)) { 1271 IF_ADDR_RUNLOCK(ifp); 1272 return (EINVAL); 1273 } 1274 bzero(&ifgrq, sizeof ifgrq); 1275 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1276 sizeof(ifgrq.ifgrq_group)); 1277 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1278 IF_ADDR_RUNLOCK(ifp); 1279 return (error); 1280 } 1281 len -= sizeof(ifgrq); 1282 ifgp++; 1283 } 1284 IF_ADDR_RUNLOCK(ifp); 1285 1286 return (0); 1287 } 1288 1289 /* 1290 * Stores all members of a group in memory pointed to by data 1291 */ 1292 static int 1293 if_getgroupmembers(struct ifgroupreq *data) 1294 { 1295 struct ifgroupreq *ifgr = data; 1296 struct ifg_group *ifg; 1297 struct ifg_member *ifgm; 1298 struct ifg_req ifgrq, *ifgp; 1299 int len, error; 1300 1301 IFNET_RLOCK(); 1302 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1303 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1304 break; 1305 if (ifg == NULL) { 1306 IFNET_RUNLOCK(); 1307 return (ENOENT); 1308 } 1309 1310 if (ifgr->ifgr_len == 0) { 1311 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1312 ifgr->ifgr_len += sizeof(ifgrq); 1313 IFNET_RUNLOCK(); 1314 return (0); 1315 } 1316 1317 len = ifgr->ifgr_len; 1318 ifgp = ifgr->ifgr_groups; 1319 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1320 if (len < sizeof(ifgrq)) { 1321 IFNET_RUNLOCK(); 1322 return (EINVAL); 1323 } 1324 bzero(&ifgrq, sizeof ifgrq); 1325 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1326 sizeof(ifgrq.ifgrq_member)); 1327 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1328 IFNET_RUNLOCK(); 1329 return (error); 1330 } 1331 len -= sizeof(ifgrq); 1332 ifgp++; 1333 } 1334 IFNET_RUNLOCK(); 1335 1336 return (0); 1337 } 1338 1339 /* 1340 * Delete Routes for a Network Interface 1341 * 1342 * Called for each routing entry via the rnh->rnh_walktree() call above 1343 * to delete all route entries referencing a detaching network interface. 1344 * 1345 * Arguments: 1346 * rn pointer to node in the routing table 1347 * arg argument passed to rnh->rnh_walktree() - detaching interface 1348 * 1349 * Returns: 1350 * 0 successful 1351 * errno failed - reason indicated 1352 * 1353 */ 1354 static int 1355 if_rtdel(struct radix_node *rn, void *arg) 1356 { 1357 struct rtentry *rt = (struct rtentry *)rn; 1358 struct ifnet *ifp = arg; 1359 int err; 1360 1361 if (rt->rt_ifp == ifp) { 1362 1363 /* 1364 * Protect (sorta) against walktree recursion problems 1365 * with cloned routes 1366 */ 1367 if ((rt->rt_flags & RTF_UP) == 0) 1368 return (0); 1369 1370 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1371 rt_mask(rt), 1372 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED, 1373 (struct rtentry **) NULL, rt->rt_fibnum); 1374 if (err) { 1375 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1376 } 1377 } 1378 1379 return (0); 1380 } 1381 1382 /* 1383 * Wrapper functions for struct ifnet address list locking macros. These are 1384 * used by kernel modules to avoid encoding programming interface or binary 1385 * interface assumptions that may be violated when kernel-internal locking 1386 * approaches change. 1387 */ 1388 void 1389 if_addr_rlock(struct ifnet *ifp) 1390 { 1391 1392 IF_ADDR_RLOCK(ifp); 1393 } 1394 1395 void 1396 if_addr_runlock(struct ifnet *ifp) 1397 { 1398 1399 IF_ADDR_RUNLOCK(ifp); 1400 } 1401 1402 void 1403 if_maddr_rlock(struct ifnet *ifp) 1404 { 1405 1406 IF_ADDR_RLOCK(ifp); 1407 } 1408 1409 void 1410 if_maddr_runlock(struct ifnet *ifp) 1411 { 1412 1413 IF_ADDR_RUNLOCK(ifp); 1414 } 1415 1416 /* 1417 * Initialization, destruction and refcounting functions for ifaddrs. 1418 */ 1419 struct ifaddr * 1420 ifa_alloc(size_t size, int flags) 1421 { 1422 struct ifaddr *ifa; 1423 1424 KASSERT(size >= sizeof(struct ifaddr), 1425 ("%s: invalid size %zu", __func__, size)); 1426 1427 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1428 if (ifa == NULL) 1429 return (NULL); 1430 1431 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1432 goto fail; 1433 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1434 goto fail; 1435 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1436 goto fail; 1437 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1438 goto fail; 1439 1440 refcount_init(&ifa->ifa_refcnt, 1); 1441 1442 return (ifa); 1443 1444 fail: 1445 /* free(NULL) is okay */ 1446 counter_u64_free(ifa->ifa_opackets); 1447 counter_u64_free(ifa->ifa_ipackets); 1448 counter_u64_free(ifa->ifa_obytes); 1449 counter_u64_free(ifa->ifa_ibytes); 1450 free(ifa, M_IFADDR); 1451 1452 return (NULL); 1453 } 1454 1455 void 1456 ifa_ref(struct ifaddr *ifa) 1457 { 1458 1459 refcount_acquire(&ifa->ifa_refcnt); 1460 } 1461 1462 void 1463 ifa_free(struct ifaddr *ifa) 1464 { 1465 1466 if (refcount_release(&ifa->ifa_refcnt)) { 1467 counter_u64_free(ifa->ifa_opackets); 1468 counter_u64_free(ifa->ifa_ipackets); 1469 counter_u64_free(ifa->ifa_obytes); 1470 counter_u64_free(ifa->ifa_ibytes); 1471 free(ifa, M_IFADDR); 1472 } 1473 } 1474 1475 int 1476 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1477 { 1478 int error = 0; 1479 struct rtentry *rt = NULL; 1480 struct rt_addrinfo info; 1481 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1482 1483 bzero(&info, sizeof(info)); 1484 info.rti_ifp = V_loif; 1485 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1486 info.rti_info[RTAX_DST] = ia; 1487 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1488 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1489 1490 if (error == 0 && rt != NULL) { 1491 RT_LOCK(rt); 1492 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1493 ifa->ifa_ifp->if_type; 1494 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1495 ifa->ifa_ifp->if_index; 1496 RT_REMREF(rt); 1497 RT_UNLOCK(rt); 1498 } else if (error != 0) 1499 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error); 1500 1501 return (error); 1502 } 1503 1504 int 1505 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1506 { 1507 int error = 0; 1508 struct rt_addrinfo info; 1509 struct sockaddr_dl null_sdl; 1510 1511 bzero(&null_sdl, sizeof(null_sdl)); 1512 null_sdl.sdl_len = sizeof(null_sdl); 1513 null_sdl.sdl_family = AF_LINK; 1514 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1515 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1516 bzero(&info, sizeof(info)); 1517 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1518 info.rti_info[RTAX_DST] = ia; 1519 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1520 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1521 1522 if (error != 0) 1523 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error); 1524 1525 return (error); 1526 } 1527 1528 int 1529 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *sa) 1530 { 1531 struct rtentry *rt; 1532 1533 rt = rtalloc1_fib(sa, 0, 0, 0); 1534 if (rt == NULL) { 1535 log(LOG_DEBUG, "%s: fail", __func__); 1536 return (EHOSTUNREACH); 1537 } 1538 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1539 ifa->ifa_ifp->if_type; 1540 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1541 ifa->ifa_ifp->if_index; 1542 RTFREE_LOCKED(rt); 1543 1544 return (0); 1545 } 1546 1547 /* 1548 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1549 * structs used to represent other address families, it is necessary 1550 * to perform a different comparison. 1551 */ 1552 1553 #define sa_equal(a1, a2) \ 1554 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1555 1556 #define sa_dl_equal(a1, a2) \ 1557 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1558 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1559 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1560 LLADDR((struct sockaddr_dl *)(a2)), \ 1561 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1562 1563 /* 1564 * Locate an interface based on a complete address. 1565 */ 1566 /*ARGSUSED*/ 1567 static struct ifaddr * 1568 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1569 { 1570 struct ifnet *ifp; 1571 struct ifaddr *ifa; 1572 1573 IFNET_RLOCK_NOSLEEP(); 1574 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1575 IF_ADDR_RLOCK(ifp); 1576 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1577 if (ifa->ifa_addr->sa_family != addr->sa_family) 1578 continue; 1579 if (sa_equal(addr, ifa->ifa_addr)) { 1580 if (getref) 1581 ifa_ref(ifa); 1582 IF_ADDR_RUNLOCK(ifp); 1583 goto done; 1584 } 1585 /* IP6 doesn't have broadcast */ 1586 if ((ifp->if_flags & IFF_BROADCAST) && 1587 ifa->ifa_broadaddr && 1588 ifa->ifa_broadaddr->sa_len != 0 && 1589 sa_equal(ifa->ifa_broadaddr, addr)) { 1590 if (getref) 1591 ifa_ref(ifa); 1592 IF_ADDR_RUNLOCK(ifp); 1593 goto done; 1594 } 1595 } 1596 IF_ADDR_RUNLOCK(ifp); 1597 } 1598 ifa = NULL; 1599 done: 1600 IFNET_RUNLOCK_NOSLEEP(); 1601 return (ifa); 1602 } 1603 1604 struct ifaddr * 1605 ifa_ifwithaddr(struct sockaddr *addr) 1606 { 1607 1608 return (ifa_ifwithaddr_internal(addr, 1)); 1609 } 1610 1611 int 1612 ifa_ifwithaddr_check(struct sockaddr *addr) 1613 { 1614 1615 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1616 } 1617 1618 /* 1619 * Locate an interface based on the broadcast address. 1620 */ 1621 /* ARGSUSED */ 1622 struct ifaddr * 1623 ifa_ifwithbroadaddr(struct sockaddr *addr) 1624 { 1625 struct ifnet *ifp; 1626 struct ifaddr *ifa; 1627 1628 IFNET_RLOCK_NOSLEEP(); 1629 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1630 IF_ADDR_RLOCK(ifp); 1631 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1632 if (ifa->ifa_addr->sa_family != addr->sa_family) 1633 continue; 1634 if ((ifp->if_flags & IFF_BROADCAST) && 1635 ifa->ifa_broadaddr && 1636 ifa->ifa_broadaddr->sa_len != 0 && 1637 sa_equal(ifa->ifa_broadaddr, addr)) { 1638 ifa_ref(ifa); 1639 IF_ADDR_RUNLOCK(ifp); 1640 goto done; 1641 } 1642 } 1643 IF_ADDR_RUNLOCK(ifp); 1644 } 1645 ifa = NULL; 1646 done: 1647 IFNET_RUNLOCK_NOSLEEP(); 1648 return (ifa); 1649 } 1650 1651 /* 1652 * Locate the point to point interface with a given destination address. 1653 */ 1654 /*ARGSUSED*/ 1655 struct ifaddr * 1656 ifa_ifwithdstaddr(struct sockaddr *addr) 1657 { 1658 struct ifnet *ifp; 1659 struct ifaddr *ifa; 1660 1661 IFNET_RLOCK_NOSLEEP(); 1662 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1663 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1664 continue; 1665 IF_ADDR_RLOCK(ifp); 1666 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1667 if (ifa->ifa_addr->sa_family != addr->sa_family) 1668 continue; 1669 if (ifa->ifa_dstaddr != NULL && 1670 sa_equal(addr, ifa->ifa_dstaddr)) { 1671 ifa_ref(ifa); 1672 IF_ADDR_RUNLOCK(ifp); 1673 goto done; 1674 } 1675 } 1676 IF_ADDR_RUNLOCK(ifp); 1677 } 1678 ifa = NULL; 1679 done: 1680 IFNET_RUNLOCK_NOSLEEP(); 1681 return (ifa); 1682 } 1683 1684 /* 1685 * Find an interface on a specific network. If many, choice 1686 * is most specific found. 1687 */ 1688 struct ifaddr * 1689 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1690 { 1691 struct ifnet *ifp; 1692 struct ifaddr *ifa; 1693 struct ifaddr *ifa_maybe = NULL; 1694 u_int af = addr->sa_family; 1695 char *addr_data = addr->sa_data, *cplim; 1696 1697 /* 1698 * AF_LINK addresses can be looked up directly by their index number, 1699 * so do that if we can. 1700 */ 1701 if (af == AF_LINK) { 1702 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1703 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1704 return (ifaddr_byindex(sdl->sdl_index)); 1705 } 1706 1707 /* 1708 * Scan though each interface, looking for ones that have addresses 1709 * in this address family. Maintain a reference on ifa_maybe once 1710 * we find one, as we release the IF_ADDR_RLOCK() that kept it stable 1711 * when we move onto the next interface. 1712 */ 1713 IFNET_RLOCK_NOSLEEP(); 1714 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1715 IF_ADDR_RLOCK(ifp); 1716 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1717 char *cp, *cp2, *cp3; 1718 1719 if (ifa->ifa_addr->sa_family != af) 1720 next: continue; 1721 if (af == AF_INET && 1722 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1723 /* 1724 * This is a bit broken as it doesn't 1725 * take into account that the remote end may 1726 * be a single node in the network we are 1727 * looking for. 1728 * The trouble is that we don't know the 1729 * netmask for the remote end. 1730 */ 1731 if (ifa->ifa_dstaddr != NULL && 1732 sa_equal(addr, ifa->ifa_dstaddr)) { 1733 ifa_ref(ifa); 1734 IF_ADDR_RUNLOCK(ifp); 1735 goto done; 1736 } 1737 } else { 1738 /* 1739 * if we have a special address handler, 1740 * then use it instead of the generic one. 1741 */ 1742 if (ifa->ifa_claim_addr) { 1743 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1744 ifa_ref(ifa); 1745 IF_ADDR_RUNLOCK(ifp); 1746 goto done; 1747 } 1748 continue; 1749 } 1750 1751 /* 1752 * Scan all the bits in the ifa's address. 1753 * If a bit dissagrees with what we are 1754 * looking for, mask it with the netmask 1755 * to see if it really matters. 1756 * (A byte at a time) 1757 */ 1758 if (ifa->ifa_netmask == 0) 1759 continue; 1760 cp = addr_data; 1761 cp2 = ifa->ifa_addr->sa_data; 1762 cp3 = ifa->ifa_netmask->sa_data; 1763 cplim = ifa->ifa_netmask->sa_len 1764 + (char *)ifa->ifa_netmask; 1765 while (cp3 < cplim) 1766 if ((*cp++ ^ *cp2++) & *cp3++) 1767 goto next; /* next address! */ 1768 /* 1769 * If the netmask of what we just found 1770 * is more specific than what we had before 1771 * (if we had one), or if the virtual status 1772 * of new prefix is better than of the old one, 1773 * then remember the new one before continuing 1774 * to search for an even better one. 1775 */ 1776 if (ifa_maybe == NULL || 1777 ifa_preferred(ifa_maybe, ifa) || 1778 rn_refines((caddr_t)ifa->ifa_netmask, 1779 (caddr_t)ifa_maybe->ifa_netmask)) { 1780 if (ifa_maybe != NULL) 1781 ifa_free(ifa_maybe); 1782 ifa_maybe = ifa; 1783 ifa_ref(ifa_maybe); 1784 } 1785 } 1786 } 1787 IF_ADDR_RUNLOCK(ifp); 1788 } 1789 ifa = ifa_maybe; 1790 ifa_maybe = NULL; 1791 done: 1792 IFNET_RUNLOCK_NOSLEEP(); 1793 if (ifa_maybe != NULL) 1794 ifa_free(ifa_maybe); 1795 return (ifa); 1796 } 1797 1798 /* 1799 * Find an interface address specific to an interface best matching 1800 * a given address. 1801 */ 1802 struct ifaddr * 1803 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1804 { 1805 struct ifaddr *ifa; 1806 char *cp, *cp2, *cp3; 1807 char *cplim; 1808 struct ifaddr *ifa_maybe = NULL; 1809 u_int af = addr->sa_family; 1810 1811 if (af >= AF_MAX) 1812 return (NULL); 1813 IF_ADDR_RLOCK(ifp); 1814 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1815 if (ifa->ifa_addr->sa_family != af) 1816 continue; 1817 if (ifa_maybe == NULL) 1818 ifa_maybe = ifa; 1819 if (ifa->ifa_netmask == 0) { 1820 if (sa_equal(addr, ifa->ifa_addr) || 1821 (ifa->ifa_dstaddr && 1822 sa_equal(addr, ifa->ifa_dstaddr))) 1823 goto done; 1824 continue; 1825 } 1826 if (ifp->if_flags & IFF_POINTOPOINT) { 1827 if (sa_equal(addr, ifa->ifa_dstaddr)) 1828 goto done; 1829 } else { 1830 cp = addr->sa_data; 1831 cp2 = ifa->ifa_addr->sa_data; 1832 cp3 = ifa->ifa_netmask->sa_data; 1833 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1834 for (; cp3 < cplim; cp3++) 1835 if ((*cp++ ^ *cp2++) & *cp3) 1836 break; 1837 if (cp3 == cplim) 1838 goto done; 1839 } 1840 } 1841 ifa = ifa_maybe; 1842 done: 1843 if (ifa != NULL) 1844 ifa_ref(ifa); 1845 IF_ADDR_RUNLOCK(ifp); 1846 return (ifa); 1847 } 1848 1849 /* 1850 * See whether new ifa is better than current one: 1851 * 1) A non-virtual one is preferred over virtual. 1852 * 2) A virtual in master state preferred over any other state. 1853 * 1854 * Used in several address selecting functions. 1855 */ 1856 int 1857 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 1858 { 1859 1860 return (cur->ifa_carp && (!next->ifa_carp || 1861 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 1862 } 1863 1864 #include <net/if_llatbl.h> 1865 1866 /* 1867 * Default action when installing a route with a Link Level gateway. 1868 * Lookup an appropriate real ifa to point to. 1869 * This should be moved to /sys/net/link.c eventually. 1870 */ 1871 static void 1872 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1873 { 1874 struct ifaddr *ifa, *oifa; 1875 struct sockaddr *dst; 1876 struct ifnet *ifp; 1877 1878 RT_LOCK_ASSERT(rt); 1879 1880 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1881 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1882 return; 1883 ifa = ifaof_ifpforaddr(dst, ifp); 1884 if (ifa) { 1885 oifa = rt->rt_ifa; 1886 rt->rt_ifa = ifa; 1887 ifa_free(oifa); 1888 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1889 ifa->ifa_rtrequest(cmd, rt, info); 1890 } 1891 } 1892 1893 /* 1894 * Mark an interface down and notify protocols of 1895 * the transition. 1896 */ 1897 static void 1898 if_unroute(struct ifnet *ifp, int flag, int fam) 1899 { 1900 struct ifaddr *ifa; 1901 1902 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1903 1904 ifp->if_flags &= ~flag; 1905 getmicrotime(&ifp->if_lastchange); 1906 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1907 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1908 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1909 ifp->if_qflush(ifp); 1910 1911 if (ifp->if_carp) 1912 (*carp_linkstate_p)(ifp); 1913 rt_ifmsg(ifp); 1914 } 1915 1916 /* 1917 * Mark an interface up and notify protocols of 1918 * the transition. 1919 */ 1920 static void 1921 if_route(struct ifnet *ifp, int flag, int fam) 1922 { 1923 struct ifaddr *ifa; 1924 1925 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1926 1927 ifp->if_flags |= flag; 1928 getmicrotime(&ifp->if_lastchange); 1929 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1930 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1931 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1932 if (ifp->if_carp) 1933 (*carp_linkstate_p)(ifp); 1934 rt_ifmsg(ifp); 1935 #ifdef INET6 1936 in6_if_up(ifp); 1937 #endif 1938 } 1939 1940 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1941 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1942 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1943 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1944 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1945 int (*vlan_setcookie_p)(struct ifnet *, void *); 1946 void *(*vlan_cookie_p)(struct ifnet *); 1947 1948 /* 1949 * Handle a change in the interface link state. To avoid LORs 1950 * between driver lock and upper layer locks, as well as possible 1951 * recursions, we post event to taskqueue, and all job 1952 * is done in static do_link_state_change(). 1953 */ 1954 void 1955 if_link_state_change(struct ifnet *ifp, int link_state) 1956 { 1957 /* Return if state hasn't changed. */ 1958 if (ifp->if_link_state == link_state) 1959 return; 1960 1961 ifp->if_link_state = link_state; 1962 1963 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1964 } 1965 1966 static void 1967 do_link_state_change(void *arg, int pending) 1968 { 1969 struct ifnet *ifp = (struct ifnet *)arg; 1970 int link_state = ifp->if_link_state; 1971 CURVNET_SET(ifp->if_vnet); 1972 1973 /* Notify that the link state has changed. */ 1974 rt_ifmsg(ifp); 1975 if (ifp->if_vlantrunk != NULL) 1976 (*vlan_link_state_p)(ifp); 1977 1978 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1979 IFP2AC(ifp)->ac_netgraph != NULL) 1980 (*ng_ether_link_state_p)(ifp, link_state); 1981 if (ifp->if_carp) 1982 (*carp_linkstate_p)(ifp); 1983 if (ifp->if_bridge) 1984 (*bridge_linkstate_p)(ifp); 1985 if (ifp->if_lagg) 1986 (*lagg_linkstate_p)(ifp, link_state); 1987 1988 if (IS_DEFAULT_VNET(curvnet)) 1989 devctl_notify("IFNET", ifp->if_xname, 1990 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1991 NULL); 1992 if (pending > 1) 1993 if_printf(ifp, "%d link states coalesced\n", pending); 1994 if (log_link_state_change) 1995 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1996 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1997 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 1998 CURVNET_RESTORE(); 1999 } 2000 2001 /* 2002 * Mark an interface down and notify protocols of 2003 * the transition. 2004 */ 2005 void 2006 if_down(struct ifnet *ifp) 2007 { 2008 2009 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2010 } 2011 2012 /* 2013 * Mark an interface up and notify protocols of 2014 * the transition. 2015 */ 2016 void 2017 if_up(struct ifnet *ifp) 2018 { 2019 2020 if_route(ifp, IFF_UP, AF_UNSPEC); 2021 } 2022 2023 /* 2024 * Flush an interface queue. 2025 */ 2026 void 2027 if_qflush(struct ifnet *ifp) 2028 { 2029 struct mbuf *m, *n; 2030 struct ifaltq *ifq; 2031 2032 ifq = &ifp->if_snd; 2033 IFQ_LOCK(ifq); 2034 #ifdef ALTQ 2035 if (ALTQ_IS_ENABLED(ifq)) 2036 ALTQ_PURGE(ifq); 2037 #endif 2038 n = ifq->ifq_head; 2039 while ((m = n) != 0) { 2040 n = m->m_act; 2041 m_freem(m); 2042 } 2043 ifq->ifq_head = 0; 2044 ifq->ifq_tail = 0; 2045 ifq->ifq_len = 0; 2046 IFQ_UNLOCK(ifq); 2047 } 2048 2049 /* 2050 * Map interface name to interface structure pointer, with or without 2051 * returning a reference. 2052 */ 2053 struct ifnet * 2054 ifunit_ref(const char *name) 2055 { 2056 struct ifnet *ifp; 2057 2058 IFNET_RLOCK_NOSLEEP(); 2059 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2060 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2061 !(ifp->if_flags & IFF_DYING)) 2062 break; 2063 } 2064 if (ifp != NULL) 2065 if_ref(ifp); 2066 IFNET_RUNLOCK_NOSLEEP(); 2067 return (ifp); 2068 } 2069 2070 struct ifnet * 2071 ifunit(const char *name) 2072 { 2073 struct ifnet *ifp; 2074 2075 IFNET_RLOCK_NOSLEEP(); 2076 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2077 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2078 break; 2079 } 2080 IFNET_RUNLOCK_NOSLEEP(); 2081 return (ifp); 2082 } 2083 2084 /* 2085 * Hardware specific interface ioctls. 2086 */ 2087 static int 2088 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2089 { 2090 struct ifreq *ifr; 2091 struct ifstat *ifs; 2092 int error = 0; 2093 int new_flags, temp_flags; 2094 size_t namelen, onamelen; 2095 size_t descrlen; 2096 char *descrbuf, *odescrbuf; 2097 char new_name[IFNAMSIZ]; 2098 struct ifaddr *ifa; 2099 struct sockaddr_dl *sdl; 2100 2101 ifr = (struct ifreq *)data; 2102 switch (cmd) { 2103 case SIOCGIFINDEX: 2104 ifr->ifr_index = ifp->if_index; 2105 break; 2106 2107 case SIOCGIFFLAGS: 2108 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2109 ifr->ifr_flags = temp_flags & 0xffff; 2110 ifr->ifr_flagshigh = temp_flags >> 16; 2111 break; 2112 2113 case SIOCGIFCAP: 2114 ifr->ifr_reqcap = ifp->if_capabilities; 2115 ifr->ifr_curcap = ifp->if_capenable; 2116 break; 2117 2118 #ifdef MAC 2119 case SIOCGIFMAC: 2120 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2121 break; 2122 #endif 2123 2124 case SIOCGIFMETRIC: 2125 ifr->ifr_metric = ifp->if_metric; 2126 break; 2127 2128 case SIOCGIFMTU: 2129 ifr->ifr_mtu = ifp->if_mtu; 2130 break; 2131 2132 case SIOCGIFPHYS: 2133 ifr->ifr_phys = ifp->if_physical; 2134 break; 2135 2136 case SIOCGIFDESCR: 2137 error = 0; 2138 sx_slock(&ifdescr_sx); 2139 if (ifp->if_description == NULL) 2140 error = ENOMSG; 2141 else { 2142 /* space for terminating nul */ 2143 descrlen = strlen(ifp->if_description) + 1; 2144 if (ifr->ifr_buffer.length < descrlen) 2145 ifr->ifr_buffer.buffer = NULL; 2146 else 2147 error = copyout(ifp->if_description, 2148 ifr->ifr_buffer.buffer, descrlen); 2149 ifr->ifr_buffer.length = descrlen; 2150 } 2151 sx_sunlock(&ifdescr_sx); 2152 break; 2153 2154 case SIOCSIFDESCR: 2155 error = priv_check(td, PRIV_NET_SETIFDESCR); 2156 if (error) 2157 return (error); 2158 2159 /* 2160 * Copy only (length-1) bytes to make sure that 2161 * if_description is always nul terminated. The 2162 * length parameter is supposed to count the 2163 * terminating nul in. 2164 */ 2165 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2166 return (ENAMETOOLONG); 2167 else if (ifr->ifr_buffer.length == 0) 2168 descrbuf = NULL; 2169 else { 2170 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2171 M_WAITOK | M_ZERO); 2172 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2173 ifr->ifr_buffer.length - 1); 2174 if (error) { 2175 free(descrbuf, M_IFDESCR); 2176 break; 2177 } 2178 } 2179 2180 sx_xlock(&ifdescr_sx); 2181 odescrbuf = ifp->if_description; 2182 ifp->if_description = descrbuf; 2183 sx_xunlock(&ifdescr_sx); 2184 2185 getmicrotime(&ifp->if_lastchange); 2186 free(odescrbuf, M_IFDESCR); 2187 break; 2188 2189 case SIOCGIFFIB: 2190 ifr->ifr_fib = ifp->if_fib; 2191 break; 2192 2193 case SIOCSIFFIB: 2194 error = priv_check(td, PRIV_NET_SETIFFIB); 2195 if (error) 2196 return (error); 2197 if (ifr->ifr_fib >= rt_numfibs) 2198 return (EINVAL); 2199 2200 ifp->if_fib = ifr->ifr_fib; 2201 break; 2202 2203 case SIOCSIFFLAGS: 2204 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2205 if (error) 2206 return (error); 2207 /* 2208 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2209 * check, so we don't need special handling here yet. 2210 */ 2211 new_flags = (ifr->ifr_flags & 0xffff) | 2212 (ifr->ifr_flagshigh << 16); 2213 if (ifp->if_flags & IFF_UP && 2214 (new_flags & IFF_UP) == 0) { 2215 if_down(ifp); 2216 } else if (new_flags & IFF_UP && 2217 (ifp->if_flags & IFF_UP) == 0) { 2218 if_up(ifp); 2219 } 2220 /* See if permanently promiscuous mode bit is about to flip */ 2221 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2222 if (new_flags & IFF_PPROMISC) 2223 ifp->if_flags |= IFF_PROMISC; 2224 else if (ifp->if_pcount == 0) 2225 ifp->if_flags &= ~IFF_PROMISC; 2226 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2227 ifp->if_xname, 2228 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2229 } 2230 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2231 (new_flags &~ IFF_CANTCHANGE); 2232 if (ifp->if_ioctl) { 2233 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2234 } 2235 getmicrotime(&ifp->if_lastchange); 2236 break; 2237 2238 case SIOCSIFCAP: 2239 error = priv_check(td, PRIV_NET_SETIFCAP); 2240 if (error) 2241 return (error); 2242 if (ifp->if_ioctl == NULL) 2243 return (EOPNOTSUPP); 2244 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2245 return (EINVAL); 2246 error = (*ifp->if_ioctl)(ifp, cmd, data); 2247 if (error == 0) 2248 getmicrotime(&ifp->if_lastchange); 2249 break; 2250 2251 #ifdef MAC 2252 case SIOCSIFMAC: 2253 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2254 break; 2255 #endif 2256 2257 case SIOCSIFNAME: 2258 error = priv_check(td, PRIV_NET_SETIFNAME); 2259 if (error) 2260 return (error); 2261 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2262 if (error != 0) 2263 return (error); 2264 if (new_name[0] == '\0') 2265 return (EINVAL); 2266 if (ifunit(new_name) != NULL) 2267 return (EEXIST); 2268 2269 /* 2270 * XXX: Locking. Nothing else seems to lock if_flags, 2271 * and there are numerous other races with the 2272 * ifunit() checks not being atomic with namespace 2273 * changes (renames, vmoves, if_attach, etc). 2274 */ 2275 ifp->if_flags |= IFF_RENAMING; 2276 2277 /* Announce the departure of the interface. */ 2278 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2279 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2280 2281 log(LOG_INFO, "%s: changing name to '%s'\n", 2282 ifp->if_xname, new_name); 2283 2284 IF_ADDR_WLOCK(ifp); 2285 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2286 ifa = ifp->if_addr; 2287 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2288 namelen = strlen(new_name); 2289 onamelen = sdl->sdl_nlen; 2290 /* 2291 * Move the address if needed. This is safe because we 2292 * allocate space for a name of length IFNAMSIZ when we 2293 * create this in if_attach(). 2294 */ 2295 if (namelen != onamelen) { 2296 bcopy(sdl->sdl_data + onamelen, 2297 sdl->sdl_data + namelen, sdl->sdl_alen); 2298 } 2299 bcopy(new_name, sdl->sdl_data, namelen); 2300 sdl->sdl_nlen = namelen; 2301 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2302 bzero(sdl->sdl_data, onamelen); 2303 while (namelen != 0) 2304 sdl->sdl_data[--namelen] = 0xff; 2305 IF_ADDR_WUNLOCK(ifp); 2306 2307 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2308 /* Announce the return of the interface. */ 2309 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2310 2311 ifp->if_flags &= ~IFF_RENAMING; 2312 break; 2313 2314 #ifdef VIMAGE 2315 case SIOCSIFVNET: 2316 error = priv_check(td, PRIV_NET_SETIFVNET); 2317 if (error) 2318 return (error); 2319 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2320 break; 2321 #endif 2322 2323 case SIOCSIFMETRIC: 2324 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2325 if (error) 2326 return (error); 2327 ifp->if_metric = ifr->ifr_metric; 2328 getmicrotime(&ifp->if_lastchange); 2329 break; 2330 2331 case SIOCSIFPHYS: 2332 error = priv_check(td, PRIV_NET_SETIFPHYS); 2333 if (error) 2334 return (error); 2335 if (ifp->if_ioctl == NULL) 2336 return (EOPNOTSUPP); 2337 error = (*ifp->if_ioctl)(ifp, cmd, data); 2338 if (error == 0) 2339 getmicrotime(&ifp->if_lastchange); 2340 break; 2341 2342 case SIOCSIFMTU: 2343 { 2344 u_long oldmtu = ifp->if_mtu; 2345 2346 error = priv_check(td, PRIV_NET_SETIFMTU); 2347 if (error) 2348 return (error); 2349 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2350 return (EINVAL); 2351 if (ifp->if_ioctl == NULL) 2352 return (EOPNOTSUPP); 2353 error = (*ifp->if_ioctl)(ifp, cmd, data); 2354 if (error == 0) { 2355 getmicrotime(&ifp->if_lastchange); 2356 rt_ifmsg(ifp); 2357 } 2358 /* 2359 * If the link MTU changed, do network layer specific procedure. 2360 */ 2361 if (ifp->if_mtu != oldmtu) { 2362 #ifdef INET6 2363 nd6_setmtu(ifp); 2364 #endif 2365 } 2366 break; 2367 } 2368 2369 case SIOCADDMULTI: 2370 case SIOCDELMULTI: 2371 if (cmd == SIOCADDMULTI) 2372 error = priv_check(td, PRIV_NET_ADDMULTI); 2373 else 2374 error = priv_check(td, PRIV_NET_DELMULTI); 2375 if (error) 2376 return (error); 2377 2378 /* Don't allow group membership on non-multicast interfaces. */ 2379 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2380 return (EOPNOTSUPP); 2381 2382 /* Don't let users screw up protocols' entries. */ 2383 if (ifr->ifr_addr.sa_family != AF_LINK) 2384 return (EINVAL); 2385 2386 if (cmd == SIOCADDMULTI) { 2387 struct ifmultiaddr *ifma; 2388 2389 /* 2390 * Userland is only permitted to join groups once 2391 * via the if_addmulti() KPI, because it cannot hold 2392 * struct ifmultiaddr * between calls. It may also 2393 * lose a race while we check if the membership 2394 * already exists. 2395 */ 2396 IF_ADDR_RLOCK(ifp); 2397 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2398 IF_ADDR_RUNLOCK(ifp); 2399 if (ifma != NULL) 2400 error = EADDRINUSE; 2401 else 2402 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2403 } else { 2404 error = if_delmulti(ifp, &ifr->ifr_addr); 2405 } 2406 if (error == 0) 2407 getmicrotime(&ifp->if_lastchange); 2408 break; 2409 2410 case SIOCSIFPHYADDR: 2411 case SIOCDIFPHYADDR: 2412 #ifdef INET6 2413 case SIOCSIFPHYADDR_IN6: 2414 #endif 2415 case SIOCSLIFPHYADDR: 2416 case SIOCSIFMEDIA: 2417 case SIOCSIFGENERIC: 2418 error = priv_check(td, PRIV_NET_HWIOCTL); 2419 if (error) 2420 return (error); 2421 if (ifp->if_ioctl == NULL) 2422 return (EOPNOTSUPP); 2423 error = (*ifp->if_ioctl)(ifp, cmd, data); 2424 if (error == 0) 2425 getmicrotime(&ifp->if_lastchange); 2426 break; 2427 2428 case SIOCGIFSTATUS: 2429 ifs = (struct ifstat *)data; 2430 ifs->ascii[0] = '\0'; 2431 2432 case SIOCGIFPSRCADDR: 2433 case SIOCGIFPDSTADDR: 2434 case SIOCGLIFPHYADDR: 2435 case SIOCGIFMEDIA: 2436 case SIOCGIFGENERIC: 2437 if (ifp->if_ioctl == NULL) 2438 return (EOPNOTSUPP); 2439 error = (*ifp->if_ioctl)(ifp, cmd, data); 2440 break; 2441 2442 case SIOCSIFLLADDR: 2443 error = priv_check(td, PRIV_NET_SETLLADDR); 2444 if (error) 2445 return (error); 2446 error = if_setlladdr(ifp, 2447 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2448 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2449 break; 2450 2451 case SIOCAIFGROUP: 2452 { 2453 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2454 2455 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2456 if (error) 2457 return (error); 2458 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2459 return (error); 2460 break; 2461 } 2462 2463 case SIOCGIFGROUP: 2464 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2465 return (error); 2466 break; 2467 2468 case SIOCDIFGROUP: 2469 { 2470 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2471 2472 error = priv_check(td, PRIV_NET_DELIFGROUP); 2473 if (error) 2474 return (error); 2475 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2476 return (error); 2477 break; 2478 } 2479 2480 default: 2481 error = ENOIOCTL; 2482 break; 2483 } 2484 return (error); 2485 } 2486 2487 #ifdef COMPAT_FREEBSD32 2488 struct ifconf32 { 2489 int32_t ifc_len; 2490 union { 2491 uint32_t ifcu_buf; 2492 uint32_t ifcu_req; 2493 } ifc_ifcu; 2494 }; 2495 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2496 #endif 2497 2498 /* 2499 * Interface ioctls. 2500 */ 2501 int 2502 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2503 { 2504 struct ifnet *ifp; 2505 struct ifreq *ifr; 2506 int error; 2507 int oif_flags; 2508 2509 CURVNET_SET(so->so_vnet); 2510 switch (cmd) { 2511 case SIOCGIFCONF: 2512 error = ifconf(cmd, data); 2513 CURVNET_RESTORE(); 2514 return (error); 2515 2516 #ifdef COMPAT_FREEBSD32 2517 case SIOCGIFCONF32: 2518 { 2519 struct ifconf32 *ifc32; 2520 struct ifconf ifc; 2521 2522 ifc32 = (struct ifconf32 *)data; 2523 ifc.ifc_len = ifc32->ifc_len; 2524 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2525 2526 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2527 CURVNET_RESTORE(); 2528 if (error == 0) 2529 ifc32->ifc_len = ifc.ifc_len; 2530 return (error); 2531 } 2532 #endif 2533 } 2534 ifr = (struct ifreq *)data; 2535 2536 switch (cmd) { 2537 #ifdef VIMAGE 2538 case SIOCSIFRVNET: 2539 error = priv_check(td, PRIV_NET_SETIFVNET); 2540 if (error == 0) 2541 error = if_vmove_reclaim(td, ifr->ifr_name, 2542 ifr->ifr_jid); 2543 CURVNET_RESTORE(); 2544 return (error); 2545 #endif 2546 case SIOCIFCREATE: 2547 case SIOCIFCREATE2: 2548 error = priv_check(td, PRIV_NET_IFCREATE); 2549 if (error == 0) 2550 error = if_clone_create(ifr->ifr_name, 2551 sizeof(ifr->ifr_name), 2552 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2553 CURVNET_RESTORE(); 2554 return (error); 2555 case SIOCIFDESTROY: 2556 error = priv_check(td, PRIV_NET_IFDESTROY); 2557 if (error == 0) 2558 error = if_clone_destroy(ifr->ifr_name); 2559 CURVNET_RESTORE(); 2560 return (error); 2561 2562 case SIOCIFGCLONERS: 2563 error = if_clone_list((struct if_clonereq *)data); 2564 CURVNET_RESTORE(); 2565 return (error); 2566 case SIOCGIFGMEMB: 2567 error = if_getgroupmembers((struct ifgroupreq *)data); 2568 CURVNET_RESTORE(); 2569 return (error); 2570 #if defined(INET) || defined(INET6) 2571 case SIOCSVH: 2572 case SIOCGVH: 2573 if (carp_ioctl_p == NULL) 2574 error = EPROTONOSUPPORT; 2575 else 2576 error = (*carp_ioctl_p)(ifr, cmd, td); 2577 CURVNET_RESTORE(); 2578 return (error); 2579 #endif 2580 } 2581 2582 ifp = ifunit_ref(ifr->ifr_name); 2583 if (ifp == NULL) { 2584 CURVNET_RESTORE(); 2585 return (ENXIO); 2586 } 2587 2588 error = ifhwioctl(cmd, ifp, data, td); 2589 if (error != ENOIOCTL) { 2590 if_rele(ifp); 2591 CURVNET_RESTORE(); 2592 return (error); 2593 } 2594 2595 oif_flags = ifp->if_flags; 2596 if (so->so_proto == NULL) { 2597 if_rele(ifp); 2598 CURVNET_RESTORE(); 2599 return (EOPNOTSUPP); 2600 } 2601 2602 /* 2603 * Pass the request on to the socket control method, and if the 2604 * latter returns EOPNOTSUPP, directly to the interface. 2605 * 2606 * Make an exception for the legacy SIOCSIF* requests. Drivers 2607 * trust SIOCSIFADDR et al to come from an already privileged 2608 * layer, and do not perform any credentials checks or input 2609 * validation. 2610 */ 2611 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 2612 ifp, td)); 2613 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 2614 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 2615 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 2616 error = (*ifp->if_ioctl)(ifp, cmd, data); 2617 2618 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2619 #ifdef INET6 2620 if (ifp->if_flags & IFF_UP) 2621 in6_if_up(ifp); 2622 #endif 2623 } 2624 if_rele(ifp); 2625 CURVNET_RESTORE(); 2626 return (error); 2627 } 2628 2629 /* 2630 * The code common to handling reference counted flags, 2631 * e.g., in ifpromisc() and if_allmulti(). 2632 * The "pflag" argument can specify a permanent mode flag to check, 2633 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2634 * 2635 * Only to be used on stack-owned flags, not driver-owned flags. 2636 */ 2637 static int 2638 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2639 { 2640 struct ifreq ifr; 2641 int error; 2642 int oldflags, oldcount; 2643 2644 /* Sanity checks to catch programming errors */ 2645 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2646 ("%s: setting driver-owned flag %d", __func__, flag)); 2647 2648 if (onswitch) 2649 KASSERT(*refcount >= 0, 2650 ("%s: increment negative refcount %d for flag %d", 2651 __func__, *refcount, flag)); 2652 else 2653 KASSERT(*refcount > 0, 2654 ("%s: decrement non-positive refcount %d for flag %d", 2655 __func__, *refcount, flag)); 2656 2657 /* In case this mode is permanent, just touch refcount */ 2658 if (ifp->if_flags & pflag) { 2659 *refcount += onswitch ? 1 : -1; 2660 return (0); 2661 } 2662 2663 /* Save ifnet parameters for if_ioctl() may fail */ 2664 oldcount = *refcount; 2665 oldflags = ifp->if_flags; 2666 2667 /* 2668 * See if we aren't the only and touching refcount is enough. 2669 * Actually toggle interface flag if we are the first or last. 2670 */ 2671 if (onswitch) { 2672 if ((*refcount)++) 2673 return (0); 2674 ifp->if_flags |= flag; 2675 } else { 2676 if (--(*refcount)) 2677 return (0); 2678 ifp->if_flags &= ~flag; 2679 } 2680 2681 /* Call down the driver since we've changed interface flags */ 2682 if (ifp->if_ioctl == NULL) { 2683 error = EOPNOTSUPP; 2684 goto recover; 2685 } 2686 ifr.ifr_flags = ifp->if_flags & 0xffff; 2687 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2688 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2689 if (error) 2690 goto recover; 2691 /* Notify userland that interface flags have changed */ 2692 rt_ifmsg(ifp); 2693 return (0); 2694 2695 recover: 2696 /* Recover after driver error */ 2697 *refcount = oldcount; 2698 ifp->if_flags = oldflags; 2699 return (error); 2700 } 2701 2702 /* 2703 * Set/clear promiscuous mode on interface ifp based on the truth value 2704 * of pswitch. The calls are reference counted so that only the first 2705 * "on" request actually has an effect, as does the final "off" request. 2706 * Results are undefined if the "off" and "on" requests are not matched. 2707 */ 2708 int 2709 ifpromisc(struct ifnet *ifp, int pswitch) 2710 { 2711 int error; 2712 int oldflags = ifp->if_flags; 2713 2714 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2715 &ifp->if_pcount, pswitch); 2716 /* If promiscuous mode status has changed, log a message */ 2717 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2718 log(LOG_INFO, "%s: promiscuous mode %s\n", 2719 ifp->if_xname, 2720 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2721 return (error); 2722 } 2723 2724 /* 2725 * Return interface configuration 2726 * of system. List may be used 2727 * in later ioctl's (above) to get 2728 * other information. 2729 */ 2730 /*ARGSUSED*/ 2731 static int 2732 ifconf(u_long cmd, caddr_t data) 2733 { 2734 struct ifconf *ifc = (struct ifconf *)data; 2735 struct ifnet *ifp; 2736 struct ifaddr *ifa; 2737 struct ifreq ifr; 2738 struct sbuf *sb; 2739 int error, full = 0, valid_len, max_len; 2740 2741 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2742 max_len = MAXPHYS - 1; 2743 2744 /* Prevent hostile input from being able to crash the system */ 2745 if (ifc->ifc_len <= 0) 2746 return (EINVAL); 2747 2748 again: 2749 if (ifc->ifc_len <= max_len) { 2750 max_len = ifc->ifc_len; 2751 full = 1; 2752 } 2753 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2754 max_len = 0; 2755 valid_len = 0; 2756 2757 IFNET_RLOCK(); 2758 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2759 int addrs; 2760 2761 /* 2762 * Zero the ifr_name buffer to make sure we don't 2763 * disclose the contents of the stack. 2764 */ 2765 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2766 2767 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2768 >= sizeof(ifr.ifr_name)) { 2769 sbuf_delete(sb); 2770 IFNET_RUNLOCK(); 2771 return (ENAMETOOLONG); 2772 } 2773 2774 addrs = 0; 2775 IF_ADDR_RLOCK(ifp); 2776 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2777 struct sockaddr *sa = ifa->ifa_addr; 2778 2779 if (prison_if(curthread->td_ucred, sa) != 0) 2780 continue; 2781 addrs++; 2782 if (sa->sa_len <= sizeof(*sa)) { 2783 ifr.ifr_addr = *sa; 2784 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2785 max_len += sizeof(ifr); 2786 } else { 2787 sbuf_bcat(sb, &ifr, 2788 offsetof(struct ifreq, ifr_addr)); 2789 max_len += offsetof(struct ifreq, ifr_addr); 2790 sbuf_bcat(sb, sa, sa->sa_len); 2791 max_len += sa->sa_len; 2792 } 2793 2794 if (sbuf_error(sb) == 0) 2795 valid_len = sbuf_len(sb); 2796 } 2797 IF_ADDR_RUNLOCK(ifp); 2798 if (addrs == 0) { 2799 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2800 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2801 max_len += sizeof(ifr); 2802 2803 if (sbuf_error(sb) == 0) 2804 valid_len = sbuf_len(sb); 2805 } 2806 } 2807 IFNET_RUNLOCK(); 2808 2809 /* 2810 * If we didn't allocate enough space (uncommon), try again. If 2811 * we have already allocated as much space as we are allowed, 2812 * return what we've got. 2813 */ 2814 if (valid_len != max_len && !full) { 2815 sbuf_delete(sb); 2816 goto again; 2817 } 2818 2819 ifc->ifc_len = valid_len; 2820 sbuf_finish(sb); 2821 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2822 sbuf_delete(sb); 2823 return (error); 2824 } 2825 2826 /* 2827 * Just like ifpromisc(), but for all-multicast-reception mode. 2828 */ 2829 int 2830 if_allmulti(struct ifnet *ifp, int onswitch) 2831 { 2832 2833 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2834 } 2835 2836 struct ifmultiaddr * 2837 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2838 { 2839 struct ifmultiaddr *ifma; 2840 2841 IF_ADDR_LOCK_ASSERT(ifp); 2842 2843 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2844 if (sa->sa_family == AF_LINK) { 2845 if (sa_dl_equal(ifma->ifma_addr, sa)) 2846 break; 2847 } else { 2848 if (sa_equal(ifma->ifma_addr, sa)) 2849 break; 2850 } 2851 } 2852 2853 return ifma; 2854 } 2855 2856 /* 2857 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2858 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2859 * the ifnet multicast address list here, so the caller must do that and 2860 * other setup work (such as notifying the device driver). The reference 2861 * count is initialized to 1. 2862 */ 2863 static struct ifmultiaddr * 2864 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2865 int mflags) 2866 { 2867 struct ifmultiaddr *ifma; 2868 struct sockaddr *dupsa; 2869 2870 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2871 M_ZERO); 2872 if (ifma == NULL) 2873 return (NULL); 2874 2875 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2876 if (dupsa == NULL) { 2877 free(ifma, M_IFMADDR); 2878 return (NULL); 2879 } 2880 bcopy(sa, dupsa, sa->sa_len); 2881 ifma->ifma_addr = dupsa; 2882 2883 ifma->ifma_ifp = ifp; 2884 ifma->ifma_refcount = 1; 2885 ifma->ifma_protospec = NULL; 2886 2887 if (llsa == NULL) { 2888 ifma->ifma_lladdr = NULL; 2889 return (ifma); 2890 } 2891 2892 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2893 if (dupsa == NULL) { 2894 free(ifma->ifma_addr, M_IFMADDR); 2895 free(ifma, M_IFMADDR); 2896 return (NULL); 2897 } 2898 bcopy(llsa, dupsa, llsa->sa_len); 2899 ifma->ifma_lladdr = dupsa; 2900 2901 return (ifma); 2902 } 2903 2904 /* 2905 * if_freemulti: free ifmultiaddr structure and possibly attached related 2906 * addresses. The caller is responsible for implementing reference 2907 * counting, notifying the driver, handling routing messages, and releasing 2908 * any dependent link layer state. 2909 */ 2910 static void 2911 if_freemulti(struct ifmultiaddr *ifma) 2912 { 2913 2914 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2915 ifma->ifma_refcount)); 2916 KASSERT(ifma->ifma_protospec == NULL, 2917 ("if_freemulti: protospec not NULL")); 2918 2919 if (ifma->ifma_lladdr != NULL) 2920 free(ifma->ifma_lladdr, M_IFMADDR); 2921 free(ifma->ifma_addr, M_IFMADDR); 2922 free(ifma, M_IFMADDR); 2923 } 2924 2925 /* 2926 * Register an additional multicast address with a network interface. 2927 * 2928 * - If the address is already present, bump the reference count on the 2929 * address and return. 2930 * - If the address is not link-layer, look up a link layer address. 2931 * - Allocate address structures for one or both addresses, and attach to the 2932 * multicast address list on the interface. If automatically adding a link 2933 * layer address, the protocol address will own a reference to the link 2934 * layer address, to be freed when it is freed. 2935 * - Notify the network device driver of an addition to the multicast address 2936 * list. 2937 * 2938 * 'sa' points to caller-owned memory with the desired multicast address. 2939 * 2940 * 'retifma' will be used to return a pointer to the resulting multicast 2941 * address reference, if desired. 2942 */ 2943 int 2944 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2945 struct ifmultiaddr **retifma) 2946 { 2947 struct ifmultiaddr *ifma, *ll_ifma; 2948 struct sockaddr *llsa; 2949 int error; 2950 2951 /* 2952 * If the address is already present, return a new reference to it; 2953 * otherwise, allocate storage and set up a new address. 2954 */ 2955 IF_ADDR_WLOCK(ifp); 2956 ifma = if_findmulti(ifp, sa); 2957 if (ifma != NULL) { 2958 ifma->ifma_refcount++; 2959 if (retifma != NULL) 2960 *retifma = ifma; 2961 IF_ADDR_WUNLOCK(ifp); 2962 return (0); 2963 } 2964 2965 /* 2966 * The address isn't already present; resolve the protocol address 2967 * into a link layer address, and then look that up, bump its 2968 * refcount or allocate an ifma for that also. If 'llsa' was 2969 * returned, we will need to free it later. 2970 */ 2971 llsa = NULL; 2972 ll_ifma = NULL; 2973 if (ifp->if_resolvemulti != NULL) { 2974 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2975 if (error) 2976 goto unlock_out; 2977 } 2978 2979 /* 2980 * Allocate the new address. Don't hook it up yet, as we may also 2981 * need to allocate a link layer multicast address. 2982 */ 2983 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2984 if (ifma == NULL) { 2985 error = ENOMEM; 2986 goto free_llsa_out; 2987 } 2988 2989 /* 2990 * If a link layer address is found, we'll need to see if it's 2991 * already present in the address list, or allocate is as well. 2992 * When this block finishes, the link layer address will be on the 2993 * list. 2994 */ 2995 if (llsa != NULL) { 2996 ll_ifma = if_findmulti(ifp, llsa); 2997 if (ll_ifma == NULL) { 2998 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2999 if (ll_ifma == NULL) { 3000 --ifma->ifma_refcount; 3001 if_freemulti(ifma); 3002 error = ENOMEM; 3003 goto free_llsa_out; 3004 } 3005 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3006 ifma_link); 3007 } else 3008 ll_ifma->ifma_refcount++; 3009 ifma->ifma_llifma = ll_ifma; 3010 } 3011 3012 /* 3013 * We now have a new multicast address, ifma, and possibly a new or 3014 * referenced link layer address. Add the primary address to the 3015 * ifnet address list. 3016 */ 3017 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3018 3019 if (retifma != NULL) 3020 *retifma = ifma; 3021 3022 /* 3023 * Must generate the message while holding the lock so that 'ifma' 3024 * pointer is still valid. 3025 */ 3026 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3027 IF_ADDR_WUNLOCK(ifp); 3028 3029 /* 3030 * We are certain we have added something, so call down to the 3031 * interface to let them know about it. 3032 */ 3033 if (ifp->if_ioctl != NULL) { 3034 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3035 } 3036 3037 if (llsa != NULL) 3038 free(llsa, M_IFMADDR); 3039 3040 return (0); 3041 3042 free_llsa_out: 3043 if (llsa != NULL) 3044 free(llsa, M_IFMADDR); 3045 3046 unlock_out: 3047 IF_ADDR_WUNLOCK(ifp); 3048 return (error); 3049 } 3050 3051 /* 3052 * Delete a multicast group membership by network-layer group address. 3053 * 3054 * Returns ENOENT if the entry could not be found. If ifp no longer 3055 * exists, results are undefined. This entry point should only be used 3056 * from subsystems which do appropriate locking to hold ifp for the 3057 * duration of the call. 3058 * Network-layer protocol domains must use if_delmulti_ifma(). 3059 */ 3060 int 3061 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3062 { 3063 struct ifmultiaddr *ifma; 3064 int lastref; 3065 #ifdef INVARIANTS 3066 struct ifnet *oifp; 3067 3068 IFNET_RLOCK_NOSLEEP(); 3069 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3070 if (ifp == oifp) 3071 break; 3072 if (ifp != oifp) 3073 ifp = NULL; 3074 IFNET_RUNLOCK_NOSLEEP(); 3075 3076 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3077 #endif 3078 if (ifp == NULL) 3079 return (ENOENT); 3080 3081 IF_ADDR_WLOCK(ifp); 3082 lastref = 0; 3083 ifma = if_findmulti(ifp, sa); 3084 if (ifma != NULL) 3085 lastref = if_delmulti_locked(ifp, ifma, 0); 3086 IF_ADDR_WUNLOCK(ifp); 3087 3088 if (ifma == NULL) 3089 return (ENOENT); 3090 3091 if (lastref && ifp->if_ioctl != NULL) { 3092 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3093 } 3094 3095 return (0); 3096 } 3097 3098 /* 3099 * Delete all multicast group membership for an interface. 3100 * Should be used to quickly flush all multicast filters. 3101 */ 3102 void 3103 if_delallmulti(struct ifnet *ifp) 3104 { 3105 struct ifmultiaddr *ifma; 3106 struct ifmultiaddr *next; 3107 3108 IF_ADDR_WLOCK(ifp); 3109 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3110 if_delmulti_locked(ifp, ifma, 0); 3111 IF_ADDR_WUNLOCK(ifp); 3112 } 3113 3114 /* 3115 * Delete a multicast group membership by group membership pointer. 3116 * Network-layer protocol domains must use this routine. 3117 * 3118 * It is safe to call this routine if the ifp disappeared. 3119 */ 3120 void 3121 if_delmulti_ifma(struct ifmultiaddr *ifma) 3122 { 3123 struct ifnet *ifp; 3124 int lastref; 3125 3126 ifp = ifma->ifma_ifp; 3127 #ifdef DIAGNOSTIC 3128 if (ifp == NULL) { 3129 printf("%s: ifma_ifp seems to be detached\n", __func__); 3130 } else { 3131 struct ifnet *oifp; 3132 3133 IFNET_RLOCK_NOSLEEP(); 3134 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3135 if (ifp == oifp) 3136 break; 3137 if (ifp != oifp) { 3138 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3139 ifp = NULL; 3140 } 3141 IFNET_RUNLOCK_NOSLEEP(); 3142 } 3143 #endif 3144 /* 3145 * If and only if the ifnet instance exists: Acquire the address lock. 3146 */ 3147 if (ifp != NULL) 3148 IF_ADDR_WLOCK(ifp); 3149 3150 lastref = if_delmulti_locked(ifp, ifma, 0); 3151 3152 if (ifp != NULL) { 3153 /* 3154 * If and only if the ifnet instance exists: 3155 * Release the address lock. 3156 * If the group was left: update the hardware hash filter. 3157 */ 3158 IF_ADDR_WUNLOCK(ifp); 3159 if (lastref && ifp->if_ioctl != NULL) { 3160 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3161 } 3162 } 3163 } 3164 3165 /* 3166 * Perform deletion of network-layer and/or link-layer multicast address. 3167 * 3168 * Return 0 if the reference count was decremented. 3169 * Return 1 if the final reference was released, indicating that the 3170 * hardware hash filter should be reprogrammed. 3171 */ 3172 static int 3173 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3174 { 3175 struct ifmultiaddr *ll_ifma; 3176 3177 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3178 KASSERT(ifma->ifma_ifp == ifp, 3179 ("%s: inconsistent ifp %p", __func__, ifp)); 3180 IF_ADDR_WLOCK_ASSERT(ifp); 3181 } 3182 3183 ifp = ifma->ifma_ifp; 3184 3185 /* 3186 * If the ifnet is detaching, null out references to ifnet, 3187 * so that upper protocol layers will notice, and not attempt 3188 * to obtain locks for an ifnet which no longer exists. The 3189 * routing socket announcement must happen before the ifnet 3190 * instance is detached from the system. 3191 */ 3192 if (detaching) { 3193 #ifdef DIAGNOSTIC 3194 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3195 #endif 3196 /* 3197 * ifp may already be nulled out if we are being reentered 3198 * to delete the ll_ifma. 3199 */ 3200 if (ifp != NULL) { 3201 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3202 ifma->ifma_ifp = NULL; 3203 } 3204 } 3205 3206 if (--ifma->ifma_refcount > 0) 3207 return 0; 3208 3209 /* 3210 * If this ifma is a network-layer ifma, a link-layer ifma may 3211 * have been associated with it. Release it first if so. 3212 */ 3213 ll_ifma = ifma->ifma_llifma; 3214 if (ll_ifma != NULL) { 3215 KASSERT(ifma->ifma_lladdr != NULL, 3216 ("%s: llifma w/o lladdr", __func__)); 3217 if (detaching) 3218 ll_ifma->ifma_ifp = NULL; /* XXX */ 3219 if (--ll_ifma->ifma_refcount == 0) { 3220 if (ifp != NULL) { 3221 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3222 ifma_link); 3223 } 3224 if_freemulti(ll_ifma); 3225 } 3226 } 3227 3228 if (ifp != NULL) 3229 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3230 3231 if_freemulti(ifma); 3232 3233 /* 3234 * The last reference to this instance of struct ifmultiaddr 3235 * was released; the hardware should be notified of this change. 3236 */ 3237 return 1; 3238 } 3239 3240 /* 3241 * Set the link layer address on an interface. 3242 * 3243 * At this time we only support certain types of interfaces, 3244 * and we don't allow the length of the address to change. 3245 */ 3246 int 3247 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3248 { 3249 struct sockaddr_dl *sdl; 3250 struct ifaddr *ifa; 3251 struct ifreq ifr; 3252 3253 IF_ADDR_RLOCK(ifp); 3254 ifa = ifp->if_addr; 3255 if (ifa == NULL) { 3256 IF_ADDR_RUNLOCK(ifp); 3257 return (EINVAL); 3258 } 3259 ifa_ref(ifa); 3260 IF_ADDR_RUNLOCK(ifp); 3261 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3262 if (sdl == NULL) { 3263 ifa_free(ifa); 3264 return (EINVAL); 3265 } 3266 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3267 ifa_free(ifa); 3268 return (EINVAL); 3269 } 3270 switch (ifp->if_type) { 3271 case IFT_ETHER: 3272 case IFT_FDDI: 3273 case IFT_XETHER: 3274 case IFT_ISO88025: 3275 case IFT_L2VLAN: 3276 case IFT_BRIDGE: 3277 case IFT_ARCNET: 3278 case IFT_IEEE8023ADLAG: 3279 case IFT_IEEE80211: 3280 bcopy(lladdr, LLADDR(sdl), len); 3281 ifa_free(ifa); 3282 break; 3283 default: 3284 ifa_free(ifa); 3285 return (ENODEV); 3286 } 3287 3288 /* 3289 * If the interface is already up, we need 3290 * to re-init it in order to reprogram its 3291 * address filter. 3292 */ 3293 if ((ifp->if_flags & IFF_UP) != 0) { 3294 if (ifp->if_ioctl) { 3295 ifp->if_flags &= ~IFF_UP; 3296 ifr.ifr_flags = ifp->if_flags & 0xffff; 3297 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3298 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3299 ifp->if_flags |= IFF_UP; 3300 ifr.ifr_flags = ifp->if_flags & 0xffff; 3301 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3302 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3303 } 3304 #ifdef INET 3305 /* 3306 * Also send gratuitous ARPs to notify other nodes about 3307 * the address change. 3308 */ 3309 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3310 if (ifa->ifa_addr->sa_family == AF_INET) 3311 arp_ifinit(ifp, ifa); 3312 } 3313 #endif 3314 } 3315 return (0); 3316 } 3317 3318 /* 3319 * The name argument must be a pointer to storage which will last as 3320 * long as the interface does. For physical devices, the result of 3321 * device_get_name(dev) is a good choice and for pseudo-devices a 3322 * static string works well. 3323 */ 3324 void 3325 if_initname(struct ifnet *ifp, const char *name, int unit) 3326 { 3327 ifp->if_dname = name; 3328 ifp->if_dunit = unit; 3329 if (unit != IF_DUNIT_NONE) 3330 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3331 else 3332 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3333 } 3334 3335 int 3336 if_printf(struct ifnet *ifp, const char * fmt, ...) 3337 { 3338 va_list ap; 3339 int retval; 3340 3341 retval = printf("%s: ", ifp->if_xname); 3342 va_start(ap, fmt); 3343 retval += vprintf(fmt, ap); 3344 va_end(ap); 3345 return (retval); 3346 } 3347 3348 void 3349 if_start(struct ifnet *ifp) 3350 { 3351 3352 (*(ifp)->if_start)(ifp); 3353 } 3354 3355 /* 3356 * Backwards compatibility interface for drivers 3357 * that have not implemented it 3358 */ 3359 static int 3360 if_transmit(struct ifnet *ifp, struct mbuf *m) 3361 { 3362 int error; 3363 3364 IFQ_HANDOFF(ifp, m, error); 3365 return (error); 3366 } 3367 3368 int 3369 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3370 { 3371 int active = 0; 3372 3373 IF_LOCK(ifq); 3374 if (_IF_QFULL(ifq)) { 3375 _IF_DROP(ifq); 3376 IF_UNLOCK(ifq); 3377 m_freem(m); 3378 return (0); 3379 } 3380 if (ifp != NULL) { 3381 ifp->if_obytes += m->m_pkthdr.len + adjust; 3382 if (m->m_flags & (M_BCAST|M_MCAST)) 3383 ifp->if_omcasts++; 3384 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3385 } 3386 _IF_ENQUEUE(ifq, m); 3387 IF_UNLOCK(ifq); 3388 if (ifp != NULL && !active) 3389 (*(ifp)->if_start)(ifp); 3390 return (1); 3391 } 3392 3393 void 3394 if_register_com_alloc(u_char type, 3395 if_com_alloc_t *a, if_com_free_t *f) 3396 { 3397 3398 KASSERT(if_com_alloc[type] == NULL, 3399 ("if_register_com_alloc: %d already registered", type)); 3400 KASSERT(if_com_free[type] == NULL, 3401 ("if_register_com_alloc: %d free already registered", type)); 3402 3403 if_com_alloc[type] = a; 3404 if_com_free[type] = f; 3405 } 3406 3407 void 3408 if_deregister_com_alloc(u_char type) 3409 { 3410 3411 KASSERT(if_com_alloc[type] != NULL, 3412 ("if_deregister_com_alloc: %d not registered", type)); 3413 KASSERT(if_com_free[type] != NULL, 3414 ("if_deregister_com_alloc: %d free not registered", type)); 3415 if_com_alloc[type] = NULL; 3416 if_com_free[type] = NULL; 3417 } 3418