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 <net/ethernet.h> 78#include <netinet/in.h> 79#include <netinet/in_var.h> 80#include <netinet/ip.h> 81#include <netinet/ip_carp.h> 82#ifdef INET 83#include <netinet/if_ether.h> 84#endif /* INET */ 85#ifdef INET6 86#include <netinet6/in6_var.h> 87#include <netinet6/in6_ifattach.h> 88#endif /* INET6 */ 89#endif /* INET || INET6 */ 90 91#include <security/mac/mac_framework.h> 92 93#ifdef COMPAT_FREEBSD32 94#include <sys/mount.h> 95#include <compat/freebsd32/freebsd32.h> 96#endif 97 98struct ifindex_entry { 99 struct ifnet *ife_ifnet; 100}; 101 102SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 103SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 104 105TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen); 106SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 107 &ifqmaxlen, 0, "max send queue size"); 108 109/* Log link state change events */ 110static int log_link_state_change = 1; 111 112SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 113 &log_link_state_change, 0, 114 "log interface link state change events"); 115 116/* Interface description */ 117static unsigned int ifdescr_maxlen = 1024; 118SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 119 &ifdescr_maxlen, 0, 120 "administrative maximum length for interface description"); 121 122static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 123 124/* global sx for non-critical path ifdescr */ 125static struct sx ifdescr_sx; 126SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 127 128void (*bridge_linkstate_p)(struct ifnet *ifp); 129void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 130void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 131/* These are external hooks for CARP. */ 132void (*carp_linkstate_p)(struct ifnet *ifp); 133#if defined(INET) || defined(INET6) 134struct ifnet *(*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 135int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 136 struct sockaddr *sa, struct rtentry *rt); 137#endif 138#ifdef INET 139int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *, struct in_addr *, 140 u_int8_t **); 141#endif 142#ifdef INET6 143struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 144caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 145 const struct in6_addr *taddr); 146#endif 147 148struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 149 150/* 151 * XXX: Style; these should be sorted alphabetically, and unprototyped 152 * static functions should be prototyped. Currently they are sorted by 153 * declaration order. 154 */ 155static void if_attachdomain(void *); 156static void if_attachdomain1(struct ifnet *); 157static int ifconf(u_long, caddr_t); 158static void if_freemulti(struct ifmultiaddr *); 159static void if_init(void *); 160static void if_grow(void); 161static void if_route(struct ifnet *, int flag, int fam); 162static int if_setflag(struct ifnet *, int, int, int *, int); 163static int if_transmit(struct ifnet *ifp, struct mbuf *m); 164static void if_unroute(struct ifnet *, int flag, int fam); 165static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 166static int if_rtdel(struct radix_node *, void *); 167static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 168static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 169static void do_link_state_change(void *, int); 170static int if_getgroup(struct ifgroupreq *, struct ifnet *); 171static int if_getgroupmembers(struct ifgroupreq *); 172static void if_delgroups(struct ifnet *); 173static void if_attach_internal(struct ifnet *, int); 174static void if_detach_internal(struct ifnet *, int); 175 176#ifdef INET6 177/* 178 * XXX: declare here to avoid to include many inet6 related files.. 179 * should be more generalized? 180 */ 181extern void nd6_setmtu(struct ifnet *); 182#endif 183 184VNET_DEFINE(int, if_index); 185int ifqmaxlen = IFQ_MAXLEN; 186VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 187VNET_DEFINE(struct ifgrouphead, ifg_head); 188 189static VNET_DEFINE(int, if_indexlim) = 8; 190 191/* Table of ifnet by index. */ 192VNET_DEFINE(struct ifindex_entry *, ifindex_table); 193 194#define V_if_indexlim VNET(if_indexlim) 195#define V_ifindex_table VNET(ifindex_table) 196 197/* 198 * The global network interface list (V_ifnet) and related state (such as 199 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 200 * an rwlock. Either may be acquired shared to stablize the list, but both 201 * must be acquired writable to modify the list. This model allows us to 202 * both stablize the interface list during interrupt thread processing, but 203 * also to stablize it over long-running ioctls, without introducing priority 204 * inversions and deadlocks. 205 */ 206struct rwlock ifnet_rwlock; 207struct sx ifnet_sxlock; 208 209/* 210 * The allocation of network interfaces is a rather non-atomic affair; we 211 * need to select an index before we are ready to expose the interface for 212 * use, so will use this pointer value to indicate reservation. 213 */ 214#define IFNET_HOLD (void *)(uintptr_t)(-1) 215 216static if_com_alloc_t *if_com_alloc[256]; 217static if_com_free_t *if_com_free[256]; 218 219static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 220MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 221MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 222 223struct ifnet * 224ifnet_byindex_locked(u_short idx) 225{ 226 227 if (idx > V_if_index) 228 return (NULL); 229 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 230 return (NULL); 231 return (V_ifindex_table[idx].ife_ifnet); 232} 233 234struct ifnet * 235ifnet_byindex(u_short idx) 236{ 237 struct ifnet *ifp; 238 239 IFNET_RLOCK_NOSLEEP(); 240 ifp = ifnet_byindex_locked(idx); 241 IFNET_RUNLOCK_NOSLEEP(); 242 return (ifp); 243} 244 245struct ifnet * 246ifnet_byindex_ref(u_short idx) 247{ 248 struct ifnet *ifp; 249 250 IFNET_RLOCK_NOSLEEP(); 251 ifp = ifnet_byindex_locked(idx); 252 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 253 IFNET_RUNLOCK_NOSLEEP(); 254 return (NULL); 255 } 256 if_ref(ifp); 257 IFNET_RUNLOCK_NOSLEEP(); 258 return (ifp); 259} 260 261/* 262 * Allocate an ifindex array entry; return 0 on success or an error on 263 * failure. 264 */ 265static int 266ifindex_alloc_locked(u_short *idxp) 267{ 268 u_short idx; 269 270 IFNET_WLOCK_ASSERT(); 271 272retry: 273 /* 274 * Try to find an empty slot below V_if_index. If we fail, take the 275 * next slot. 276 */ 277 for (idx = 1; idx <= V_if_index; idx++) { 278 if (V_ifindex_table[idx].ife_ifnet == NULL) 279 break; 280 } 281 282 /* Catch if_index overflow. */ 283 if (idx < 1) 284 return (ENOSPC); 285 if (idx >= V_if_indexlim) { 286 if_grow(); 287 goto retry; 288 } 289 if (idx > V_if_index) 290 V_if_index = idx; 291 *idxp = idx; 292 return (0); 293} 294 295static void 296ifindex_free_locked(u_short idx) 297{ 298 299 IFNET_WLOCK_ASSERT(); 300 301 V_ifindex_table[idx].ife_ifnet = NULL; 302 while (V_if_index > 0 && 303 V_ifindex_table[V_if_index].ife_ifnet == NULL) 304 V_if_index--; 305} 306 307static void 308ifindex_free(u_short idx) 309{ 310 311 IFNET_WLOCK(); 312 ifindex_free_locked(idx); 313 IFNET_WUNLOCK(); 314} 315 316static void 317ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 318{ 319 320 IFNET_WLOCK_ASSERT(); 321 322 V_ifindex_table[idx].ife_ifnet = ifp; 323} 324 325static void 326ifnet_setbyindex(u_short idx, struct ifnet *ifp) 327{ 328 329 IFNET_WLOCK(); 330 ifnet_setbyindex_locked(idx, ifp); 331 IFNET_WUNLOCK(); 332} 333 334struct ifaddr * 335ifaddr_byindex(u_short idx) 336{ 337 struct ifaddr *ifa; 338 339 IFNET_RLOCK_NOSLEEP(); 340 ifa = ifnet_byindex_locked(idx)->if_addr; 341 if (ifa != NULL) 342 ifa_ref(ifa); 343 IFNET_RUNLOCK_NOSLEEP(); 344 return (ifa); 345} 346 347/* 348 * Network interface utility routines. 349 * 350 * Routines with ifa_ifwith* names take sockaddr *'s as 351 * parameters. 352 */ 353 354static void 355vnet_if_init(const void *unused __unused) 356{ 357 358 TAILQ_INIT(&V_ifnet); 359 TAILQ_INIT(&V_ifg_head); 360 IFNET_WLOCK(); 361 if_grow(); /* create initial table */ 362 IFNET_WUNLOCK(); 363 vnet_if_clone_init(); 364} 365VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 366 NULL); 367 368/* ARGSUSED*/ 369static void 370if_init(void *dummy __unused) 371{ 372 373 IFNET_LOCK_INIT(); 374 if_clone_init(); 375} 376SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 377 378 379#ifdef VIMAGE 380static void 381vnet_if_uninit(const void *unused __unused) 382{ 383 384 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 385 "not empty", __func__, __LINE__, &V_ifnet)); 386 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 387 "not empty", __func__, __LINE__, &V_ifg_head)); 388 389 free((caddr_t)V_ifindex_table, M_IFNET); 390} 391VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 392 vnet_if_uninit, NULL); 393#endif 394 395static void 396if_grow(void) 397{ 398 int oldlim; 399 u_int n; 400 struct ifindex_entry *e; 401 402 IFNET_WLOCK_ASSERT(); 403 oldlim = V_if_indexlim; 404 IFNET_WUNLOCK(); 405 n = (oldlim << 1) * sizeof(*e); 406 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 407 IFNET_WLOCK(); 408 if (V_if_indexlim != oldlim) { 409 free(e, M_IFNET); 410 return; 411 } 412 if (V_ifindex_table != NULL) { 413 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 414 free((caddr_t)V_ifindex_table, M_IFNET); 415 } 416 V_if_indexlim <<= 1; 417 V_ifindex_table = e; 418} 419 420/* 421 * Allocate a struct ifnet and an index for an interface. A layer 2 422 * common structure will also be allocated if an allocation routine is 423 * registered for the passed type. 424 */ 425struct ifnet * 426if_alloc(u_char type) 427{ 428 struct ifnet *ifp; 429 u_short idx; 430 431 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 432 IFNET_WLOCK(); 433 if (ifindex_alloc_locked(&idx) != 0) { 434 IFNET_WUNLOCK(); 435 free(ifp, M_IFNET); 436 return (NULL); 437 } 438 ifnet_setbyindex_locked(idx, IFNET_HOLD); 439 IFNET_WUNLOCK(); 440 ifp->if_index = idx; 441 ifp->if_type = type; 442 ifp->if_alloctype = type; 443 if (if_com_alloc[type] != NULL) { 444 ifp->if_l2com = if_com_alloc[type](type, ifp); 445 if (ifp->if_l2com == NULL) { 446 free(ifp, M_IFNET); 447 ifindex_free(idx); 448 return (NULL); 449 } 450 } 451 452 IF_ADDR_LOCK_INIT(ifp); 453 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 454 ifp->if_afdata_initialized = 0; 455 IF_AFDATA_LOCK_INIT(ifp); 456 TAILQ_INIT(&ifp->if_addrhead); 457 TAILQ_INIT(&ifp->if_prefixhead); 458 TAILQ_INIT(&ifp->if_multiaddrs); 459 TAILQ_INIT(&ifp->if_groups); 460#ifdef MAC 461 mac_ifnet_init(ifp); 462#endif 463 ifq_init(&ifp->if_snd, ifp); 464 465 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 466 ifnet_setbyindex(ifp->if_index, ifp); 467 return (ifp); 468} 469 470/* 471 * Do the actual work of freeing a struct ifnet, and layer 2 common 472 * structure. This call is made when the last reference to an 473 * interface is released. 474 */ 475static void 476if_free_internal(struct ifnet *ifp) 477{ 478 479 KASSERT((ifp->if_flags & IFF_DYING), 480 ("if_free_internal: interface not dying")); 481 482 if (if_com_free[ifp->if_alloctype] != NULL) 483 if_com_free[ifp->if_alloctype](ifp->if_l2com, 484 ifp->if_alloctype); 485 486#ifdef MAC 487 mac_ifnet_destroy(ifp); 488#endif /* MAC */ 489 if (ifp->if_description != NULL) 490 free(ifp->if_description, M_IFDESCR); 491 IF_AFDATA_DESTROY(ifp); 492 IF_ADDR_LOCK_DESTROY(ifp); 493 ifq_delete(&ifp->if_snd); 494 free(ifp, M_IFNET); 495} 496 497/* 498 * This version should only be called by intefaces that switch their type 499 * after calling if_alloc(). if_free_type() will go away again now that we 500 * have if_alloctype to cache the original allocation type. For now, assert 501 * that they match, since we require that in practice. 502 */ 503void 504if_free_type(struct ifnet *ifp, u_char type) 505{ 506 507 KASSERT(ifp->if_alloctype == type, 508 ("if_free_type: type (%d) != alloctype (%d)", type, 509 ifp->if_alloctype)); 510 511 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 512 513 CURVNET_SET_QUIET(ifp->if_vnet); 514 IFNET_WLOCK(); 515 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 516 ("%s: freeing unallocated ifnet", ifp->if_xname)); 517 518 ifindex_free_locked(ifp->if_index); 519 IFNET_WUNLOCK(); 520 521 if (refcount_release(&ifp->if_refcount)) 522 if_free_internal(ifp); 523 CURVNET_RESTORE(); 524} 525 526/* 527 * This is the normal version of if_free(), used by device drivers to free a 528 * detached network interface. The contents of if_free_type() will move into 529 * here when if_free_type() goes away. 530 */ 531void 532if_free(struct ifnet *ifp) 533{ 534 535 if_free_type(ifp, ifp->if_alloctype); 536} 537 538/* 539 * Interfaces to keep an ifnet type-stable despite the possibility of the 540 * driver calling if_free(). If there are additional references, we defer 541 * freeing the underlying data structure. 542 */ 543void 544if_ref(struct ifnet *ifp) 545{ 546 547 /* We don't assert the ifnet list lock here, but arguably should. */ 548 refcount_acquire(&ifp->if_refcount); 549} 550 551void 552if_rele(struct ifnet *ifp) 553{ 554 555 if (!refcount_release(&ifp->if_refcount)) 556 return; 557 if_free_internal(ifp); 558} 559 560void 561ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 562{ 563 564 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 565 566 if (ifq->ifq_maxlen == 0) 567 ifq->ifq_maxlen = ifqmaxlen; 568 569 ifq->altq_type = 0; 570 ifq->altq_disc = NULL; 571 ifq->altq_flags &= ALTQF_CANTCHANGE; 572 ifq->altq_tbr = NULL; 573 ifq->altq_ifp = ifp; 574} 575 576void 577ifq_delete(struct ifaltq *ifq) 578{ 579 mtx_destroy(&ifq->ifq_mtx); 580} 581 582/* 583 * Perform generic interface initalization tasks and attach the interface 584 * to the list of "active" interfaces. If vmove flag is set on entry 585 * to if_attach_internal(), perform only a limited subset of initialization 586 * tasks, given that we are moving from one vnet to another an ifnet which 587 * has already been fully initialized. 588 * 589 * XXX: 590 * - The decision to return void and thus require this function to 591 * succeed is questionable. 592 * - We should probably do more sanity checking. For instance we don't 593 * do anything to insure if_xname is unique or non-empty. 594 */ 595void 596if_attach(struct ifnet *ifp) 597{ 598 599 if_attach_internal(ifp, 0); 600} 601 602static void 603if_attach_internal(struct ifnet *ifp, int vmove) 604{ 605 unsigned socksize, ifasize; 606 int namelen, masklen; 607 struct sockaddr_dl *sdl; 608 struct ifaddr *ifa; 609 610 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 611 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 612 ifp->if_xname); 613 614#ifdef VIMAGE 615 ifp->if_vnet = curvnet; 616 if (ifp->if_home_vnet == NULL) 617 ifp->if_home_vnet = curvnet; 618#endif 619 620 if_addgroup(ifp, IFG_ALL); 621 622 getmicrotime(&ifp->if_lastchange); 623 ifp->if_data.ifi_epoch = time_uptime; 624 ifp->if_data.ifi_datalen = sizeof(struct if_data); 625 626 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 627 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 628 ("transmit and qflush must both either be set or both be NULL")); 629 if (ifp->if_transmit == NULL) { 630 ifp->if_transmit = if_transmit; 631 ifp->if_qflush = if_qflush; 632 } 633 634 if (!vmove) { 635#ifdef MAC 636 mac_ifnet_create(ifp); 637#endif 638 639 /* 640 * Create a Link Level name for this device. 641 */ 642 namelen = strlen(ifp->if_xname); 643 /* 644 * Always save enough space for any possiable name so we 645 * can do a rename in place later. 646 */ 647 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 648 socksize = masklen + ifp->if_addrlen; 649 if (socksize < sizeof(*sdl)) 650 socksize = sizeof(*sdl); 651 socksize = roundup2(socksize, sizeof(long)); 652 ifasize = sizeof(*ifa) + 2 * socksize; 653 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 654 ifa_init(ifa); 655 sdl = (struct sockaddr_dl *)(ifa + 1); 656 sdl->sdl_len = socksize; 657 sdl->sdl_family = AF_LINK; 658 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 659 sdl->sdl_nlen = namelen; 660 sdl->sdl_index = ifp->if_index; 661 sdl->sdl_type = ifp->if_type; 662 ifp->if_addr = ifa; 663 ifa->ifa_ifp = ifp; 664 ifa->ifa_rtrequest = link_rtrequest; 665 ifa->ifa_addr = (struct sockaddr *)sdl; 666 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 667 ifa->ifa_netmask = (struct sockaddr *)sdl; 668 sdl->sdl_len = masklen; 669 while (namelen != 0) 670 sdl->sdl_data[--namelen] = 0xff; 671 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 672 /* Reliably crash if used uninitialized. */ 673 ifp->if_broadcastaddr = NULL; 674 675#if defined(INET) || defined(INET6) 676 /* Initialize to max value. */ 677 if (ifp->if_hw_tsomax == 0) 678 ifp->if_hw_tsomax = min(IP_MAXPACKET, 32 * MCLBYTES - 679 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 680 KASSERT(ifp->if_hw_tsomax <= IP_MAXPACKET && 681 ifp->if_hw_tsomax >= IP_MAXPACKET / 8, 682 ("%s: tsomax outside of range", __func__)); 683#endif 684 } 685#ifdef VIMAGE 686 else { 687 /* 688 * Update the interface index in the link layer address 689 * of the interface. 690 */ 691 for (ifa = ifp->if_addr; ifa != NULL; 692 ifa = TAILQ_NEXT(ifa, ifa_link)) { 693 if (ifa->ifa_addr->sa_family == AF_LINK) { 694 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 695 sdl->sdl_index = ifp->if_index; 696 } 697 } 698 } 699#endif 700 701 IFNET_WLOCK(); 702 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 703#ifdef VIMAGE 704 curvnet->vnet_ifcnt++; 705#endif 706 IFNET_WUNLOCK(); 707 708 if (domain_init_status >= 2) 709 if_attachdomain1(ifp); 710 711 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 712 if (IS_DEFAULT_VNET(curvnet)) 713 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 714 715 /* Announce the interface. */ 716 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 717} 718 719static void 720if_attachdomain(void *dummy) 721{ 722 struct ifnet *ifp; 723 int s; 724 725 s = splnet(); 726 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 727 if_attachdomain1(ifp); 728 splx(s); 729} 730SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 731 if_attachdomain, NULL); 732 733static void 734if_attachdomain1(struct ifnet *ifp) 735{ 736 struct domain *dp; 737 int s; 738 739 s = splnet(); 740 741 /* 742 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 743 * cannot lock ifp->if_afdata initialization, entirely. 744 */ 745 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 746 splx(s); 747 return; 748 } 749 if (ifp->if_afdata_initialized >= domain_init_status) { 750 IF_AFDATA_UNLOCK(ifp); 751 splx(s); 752 printf("if_attachdomain called more than once on %s\n", 753 ifp->if_xname); 754 return; 755 } 756 ifp->if_afdata_initialized = domain_init_status; 757 IF_AFDATA_UNLOCK(ifp); 758 759 /* address family dependent data region */ 760 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 761 for (dp = domains; dp; dp = dp->dom_next) { 762 if (dp->dom_ifattach) 763 ifp->if_afdata[dp->dom_family] = 764 (*dp->dom_ifattach)(ifp); 765 } 766 767 splx(s); 768} 769 770/* 771 * Remove any unicast or broadcast network addresses from an interface. 772 */ 773void 774if_purgeaddrs(struct ifnet *ifp) 775{ 776 struct ifaddr *ifa, *next; 777 778 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 779 if (ifa->ifa_addr->sa_family == AF_LINK) 780 continue; 781#ifdef INET 782 /* XXX: Ugly!! ad hoc just for INET */ 783 if (ifa->ifa_addr->sa_family == AF_INET) { 784 struct ifaliasreq ifr; 785 786 bzero(&ifr, sizeof(ifr)); 787 ifr.ifra_addr = *ifa->ifa_addr; 788 if (ifa->ifa_dstaddr) 789 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 790 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 791 NULL) == 0) 792 continue; 793 } 794#endif /* INET */ 795#ifdef INET6 796 if (ifa->ifa_addr->sa_family == AF_INET6) { 797 in6_purgeaddr(ifa); 798 /* ifp_addrhead is already updated */ 799 continue; 800 } 801#endif /* INET6 */ 802 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 803 ifa_free(ifa); 804 } 805} 806 807/* 808 * Remove any multicast network addresses from an interface when an ifnet 809 * is going away. 810 */ 811static void 812if_purgemaddrs(struct ifnet *ifp) 813{ 814 struct ifmultiaddr *ifma; 815 struct ifmultiaddr *next; 816 817 IF_ADDR_WLOCK(ifp); 818 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 819 if_delmulti_locked(ifp, ifma, 1); 820 IF_ADDR_WUNLOCK(ifp); 821} 822 823/* 824 * Detach an interface, removing it from the list of "active" interfaces. 825 * If vmove flag is set on entry to if_detach_internal(), perform only a 826 * limited subset of cleanup tasks, given that we are moving an ifnet from 827 * one vnet to another, where it must be fully operational. 828 * 829 * XXXRW: There are some significant questions about event ordering, and 830 * how to prevent things from starting to use the interface during detach. 831 */ 832void 833if_detach(struct ifnet *ifp) 834{ 835 836 CURVNET_SET_QUIET(ifp->if_vnet); 837 if_detach_internal(ifp, 0); 838 CURVNET_RESTORE(); 839} 840 841static void 842if_detach_internal(struct ifnet *ifp, int vmove) 843{ 844 struct ifaddr *ifa; 845 struct radix_node_head *rnh; 846 int i, j; 847 struct domain *dp; 848 struct ifnet *iter; 849 int found = 0; 850 851 IFNET_WLOCK(); 852 TAILQ_FOREACH(iter, &V_ifnet, if_link) 853 if (iter == ifp) { 854 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 855 found = 1; 856 break; 857 } 858#ifdef VIMAGE 859 if (found) 860 curvnet->vnet_ifcnt--; 861#endif 862 IFNET_WUNLOCK(); 863 if (!found) { 864 if (vmove) 865 panic("%s: ifp=%p not on the ifnet tailq %p", 866 __func__, ifp, &V_ifnet); 867 else 868 return; /* XXX this should panic as well? */ 869 } 870 871 /* 872 * Remove/wait for pending events. 873 */ 874 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 875 876 /* 877 * Remove routes and flush queues. 878 */ 879 if_down(ifp); 880#ifdef ALTQ 881 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 882 altq_disable(&ifp->if_snd); 883 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 884 altq_detach(&ifp->if_snd); 885#endif 886 887 if_purgeaddrs(ifp); 888 889#ifdef INET 890 in_ifdetach(ifp); 891#endif 892 893#ifdef INET6 894 /* 895 * Remove all IPv6 kernel structs related to ifp. This should be done 896 * before removing routing entries below, since IPv6 interface direct 897 * routes are expected to be removed by the IPv6-specific kernel API. 898 * Otherwise, the kernel will detect some inconsistency and bark it. 899 */ 900 in6_ifdetach(ifp); 901#endif 902 if_purgemaddrs(ifp); 903 904 if (!vmove) { 905 /* 906 * Prevent further calls into the device driver via ifnet. 907 */ 908 if_dead(ifp); 909 910 /* 911 * Remove link ifaddr pointer and maybe decrement if_index. 912 * Clean up all addresses. 913 */ 914 ifp->if_addr = NULL; 915 916 /* We can now free link ifaddr. */ 917 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 918 ifa = TAILQ_FIRST(&ifp->if_addrhead); 919 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 920 ifa_free(ifa); 921 } 922 } 923 924 /* 925 * Delete all remaining routes using this interface 926 * Unfortuneatly the only way to do this is to slog through 927 * the entire routing table looking for routes which point 928 * to this interface...oh well... 929 */ 930 for (i = 1; i <= AF_MAX; i++) { 931 for (j = 0; j < rt_numfibs; j++) { 932 rnh = rt_tables_get_rnh(j, i); 933 if (rnh == NULL) 934 continue; 935 RADIX_NODE_HEAD_LOCK(rnh); 936 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 937 RADIX_NODE_HEAD_UNLOCK(rnh); 938 } 939 } 940 941 /* Announce that the interface is gone. */ 942 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 943 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 944 if (IS_DEFAULT_VNET(curvnet)) 945 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 946 if_delgroups(ifp); 947 948 /* 949 * We cannot hold the lock over dom_ifdetach calls as they might 950 * sleep, for example trying to drain a callout, thus open up the 951 * theoretical race with re-attaching. 952 */ 953 IF_AFDATA_LOCK(ifp); 954 i = ifp->if_afdata_initialized; 955 ifp->if_afdata_initialized = 0; 956 IF_AFDATA_UNLOCK(ifp); 957 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 958 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 959 (*dp->dom_ifdetach)(ifp, 960 ifp->if_afdata[dp->dom_family]); 961 } 962} 963 964#ifdef VIMAGE 965/* 966 * if_vmove() performs a limited version of if_detach() in current 967 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 968 * An attempt is made to shrink if_index in current vnet, find an 969 * unused if_index in target vnet and calls if_grow() if necessary, 970 * and finally find an unused if_xname for the target vnet. 971 */ 972void 973if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 974{ 975 u_short idx; 976 977 /* 978 * Detach from current vnet, but preserve LLADDR info, do not 979 * mark as dead etc. so that the ifnet can be reattached later. 980 */ 981 if_detach_internal(ifp, 1); 982 983 /* 984 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 985 * the if_index for that vnet if possible. 986 * 987 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 988 * or we'd lock on one vnet and unlock on another. 989 */ 990 IFNET_WLOCK(); 991 ifindex_free_locked(ifp->if_index); 992 IFNET_WUNLOCK(); 993 994 /* 995 * Perform interface-specific reassignment tasks, if provided by 996 * the driver. 997 */ 998 if (ifp->if_reassign != NULL) 999 ifp->if_reassign(ifp, new_vnet, NULL); 1000 1001 /* 1002 * Switch to the context of the target vnet. 1003 */ 1004 CURVNET_SET_QUIET(new_vnet); 1005 1006 IFNET_WLOCK(); 1007 if (ifindex_alloc_locked(&idx) != 0) { 1008 IFNET_WUNLOCK(); 1009 panic("if_index overflow"); 1010 } 1011 ifp->if_index = idx; 1012 ifnet_setbyindex_locked(ifp->if_index, ifp); 1013 IFNET_WUNLOCK(); 1014 1015 if_attach_internal(ifp, 1); 1016 1017 CURVNET_RESTORE(); 1018} 1019 1020/* 1021 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1022 */ 1023static int 1024if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1025{ 1026 struct prison *pr; 1027 struct ifnet *difp; 1028 1029 /* Try to find the prison within our visibility. */ 1030 sx_slock(&allprison_lock); 1031 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1032 sx_sunlock(&allprison_lock); 1033 if (pr == NULL) 1034 return (ENXIO); 1035 prison_hold_locked(pr); 1036 mtx_unlock(&pr->pr_mtx); 1037 1038 /* Do not try to move the iface from and to the same prison. */ 1039 if (pr->pr_vnet == ifp->if_vnet) { 1040 prison_free(pr); 1041 return (EEXIST); 1042 } 1043 1044 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1045 /* XXX Lock interfaces to avoid races. */ 1046 CURVNET_SET_QUIET(pr->pr_vnet); 1047 difp = ifunit(ifname); 1048 CURVNET_RESTORE(); 1049 if (difp != NULL) { 1050 prison_free(pr); 1051 return (EEXIST); 1052 } 1053 1054 /* Move the interface into the child jail/vnet. */ 1055 if_vmove(ifp, pr->pr_vnet); 1056 1057 /* Report the new if_xname back to the userland. */ 1058 sprintf(ifname, "%s", ifp->if_xname); 1059 1060 prison_free(pr); 1061 return (0); 1062} 1063 1064static int 1065if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1066{ 1067 struct prison *pr; 1068 struct vnet *vnet_dst; 1069 struct ifnet *ifp; 1070 1071 /* Try to find the prison within our visibility. */ 1072 sx_slock(&allprison_lock); 1073 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1074 sx_sunlock(&allprison_lock); 1075 if (pr == NULL) 1076 return (ENXIO); 1077 prison_hold_locked(pr); 1078 mtx_unlock(&pr->pr_mtx); 1079 1080 /* Make sure the named iface exists in the source prison/vnet. */ 1081 CURVNET_SET(pr->pr_vnet); 1082 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1083 if (ifp == NULL) { 1084 CURVNET_RESTORE(); 1085 prison_free(pr); 1086 return (ENXIO); 1087 } 1088 1089 /* Do not try to move the iface from and to the same prison. */ 1090 vnet_dst = TD_TO_VNET(td); 1091 if (vnet_dst == ifp->if_vnet) { 1092 CURVNET_RESTORE(); 1093 prison_free(pr); 1094 return (EEXIST); 1095 } 1096 1097 /* Get interface back from child jail/vnet. */ 1098 if_vmove(ifp, vnet_dst); 1099 CURVNET_RESTORE(); 1100 1101 /* Report the new if_xname back to the userland. */ 1102 sprintf(ifname, "%s", ifp->if_xname); 1103 1104 prison_free(pr); 1105 return (0); 1106} 1107#endif /* VIMAGE */ 1108 1109/* 1110 * Add a group to an interface 1111 */ 1112int 1113if_addgroup(struct ifnet *ifp, const char *groupname) 1114{ 1115 struct ifg_list *ifgl; 1116 struct ifg_group *ifg = NULL; 1117 struct ifg_member *ifgm; 1118 1119 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1120 groupname[strlen(groupname) - 1] <= '9') 1121 return (EINVAL); 1122 1123 IFNET_WLOCK(); 1124 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1125 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1126 IFNET_WUNLOCK(); 1127 return (EEXIST); 1128 } 1129 1130 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1131 M_NOWAIT)) == NULL) { 1132 IFNET_WUNLOCK(); 1133 return (ENOMEM); 1134 } 1135 1136 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1137 M_TEMP, M_NOWAIT)) == NULL) { 1138 free(ifgl, M_TEMP); 1139 IFNET_WUNLOCK(); 1140 return (ENOMEM); 1141 } 1142 1143 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1144 if (!strcmp(ifg->ifg_group, groupname)) 1145 break; 1146 1147 if (ifg == NULL) { 1148 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1149 M_TEMP, M_NOWAIT)) == NULL) { 1150 free(ifgl, M_TEMP); 1151 free(ifgm, M_TEMP); 1152 IFNET_WUNLOCK(); 1153 return (ENOMEM); 1154 } 1155 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1156 ifg->ifg_refcnt = 0; 1157 TAILQ_INIT(&ifg->ifg_members); 1158 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1159 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1160 } 1161 1162 ifg->ifg_refcnt++; 1163 ifgl->ifgl_group = ifg; 1164 ifgm->ifgm_ifp = ifp; 1165 1166 IF_ADDR_WLOCK(ifp); 1167 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1168 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1169 IF_ADDR_WUNLOCK(ifp); 1170 1171 IFNET_WUNLOCK(); 1172 1173 EVENTHANDLER_INVOKE(group_change_event, groupname); 1174 1175 return (0); 1176} 1177 1178/* 1179 * Remove a group from an interface 1180 */ 1181int 1182if_delgroup(struct ifnet *ifp, const char *groupname) 1183{ 1184 struct ifg_list *ifgl; 1185 struct ifg_member *ifgm; 1186 1187 IFNET_WLOCK(); 1188 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1189 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1190 break; 1191 if (ifgl == NULL) { 1192 IFNET_WUNLOCK(); 1193 return (ENOENT); 1194 } 1195 1196 IF_ADDR_WLOCK(ifp); 1197 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1198 IF_ADDR_WUNLOCK(ifp); 1199 1200 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1201 if (ifgm->ifgm_ifp == ifp) 1202 break; 1203 1204 if (ifgm != NULL) { 1205 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1206 free(ifgm, M_TEMP); 1207 } 1208 1209 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1210 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1211 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1212 free(ifgl->ifgl_group, M_TEMP); 1213 } 1214 IFNET_WUNLOCK(); 1215 1216 free(ifgl, M_TEMP); 1217 1218 EVENTHANDLER_INVOKE(group_change_event, groupname); 1219 1220 return (0); 1221} 1222 1223/* 1224 * Remove an interface from all groups 1225 */ 1226static void 1227if_delgroups(struct ifnet *ifp) 1228{ 1229 struct ifg_list *ifgl; 1230 struct ifg_member *ifgm; 1231 char groupname[IFNAMSIZ]; 1232 1233 IFNET_WLOCK(); 1234 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1235 ifgl = TAILQ_FIRST(&ifp->if_groups); 1236 1237 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1238 1239 IF_ADDR_WLOCK(ifp); 1240 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1241 IF_ADDR_WUNLOCK(ifp); 1242 1243 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1244 if (ifgm->ifgm_ifp == ifp) 1245 break; 1246 1247 if (ifgm != NULL) { 1248 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1249 ifgm_next); 1250 free(ifgm, M_TEMP); 1251 } 1252 1253 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1254 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1255 EVENTHANDLER_INVOKE(group_detach_event, 1256 ifgl->ifgl_group); 1257 free(ifgl->ifgl_group, M_TEMP); 1258 } 1259 IFNET_WUNLOCK(); 1260 1261 free(ifgl, M_TEMP); 1262 1263 EVENTHANDLER_INVOKE(group_change_event, groupname); 1264 1265 IFNET_WLOCK(); 1266 } 1267 IFNET_WUNLOCK(); 1268} 1269 1270/* 1271 * Stores all groups from an interface in memory pointed 1272 * to by data 1273 */ 1274static int 1275if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1276{ 1277 int len, error; 1278 struct ifg_list *ifgl; 1279 struct ifg_req ifgrq, *ifgp; 1280 struct ifgroupreq *ifgr = data; 1281 1282 if (ifgr->ifgr_len == 0) { 1283 IF_ADDR_RLOCK(ifp); 1284 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1285 ifgr->ifgr_len += sizeof(struct ifg_req); 1286 IF_ADDR_RUNLOCK(ifp); 1287 return (0); 1288 } 1289 1290 len = ifgr->ifgr_len; 1291 ifgp = ifgr->ifgr_groups; 1292 /* XXX: wire */ 1293 IF_ADDR_RLOCK(ifp); 1294 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1295 if (len < sizeof(ifgrq)) { 1296 IF_ADDR_RUNLOCK(ifp); 1297 return (EINVAL); 1298 } 1299 bzero(&ifgrq, sizeof ifgrq); 1300 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1301 sizeof(ifgrq.ifgrq_group)); 1302 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1303 IF_ADDR_RUNLOCK(ifp); 1304 return (error); 1305 } 1306 len -= sizeof(ifgrq); 1307 ifgp++; 1308 } 1309 IF_ADDR_RUNLOCK(ifp); 1310 1311 return (0); 1312} 1313 1314/* 1315 * Stores all members of a group in memory pointed to by data 1316 */ 1317static int 1318if_getgroupmembers(struct ifgroupreq *data) 1319{ 1320 struct ifgroupreq *ifgr = data; 1321 struct ifg_group *ifg; 1322 struct ifg_member *ifgm; 1323 struct ifg_req ifgrq, *ifgp; 1324 int len, error; 1325 1326 IFNET_RLOCK(); 1327 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1328 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1329 break; 1330 if (ifg == NULL) { 1331 IFNET_RUNLOCK(); 1332 return (ENOENT); 1333 } 1334 1335 if (ifgr->ifgr_len == 0) { 1336 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1337 ifgr->ifgr_len += sizeof(ifgrq); 1338 IFNET_RUNLOCK(); 1339 return (0); 1340 } 1341 1342 len = ifgr->ifgr_len; 1343 ifgp = ifgr->ifgr_groups; 1344 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1345 if (len < sizeof(ifgrq)) { 1346 IFNET_RUNLOCK(); 1347 return (EINVAL); 1348 } 1349 bzero(&ifgrq, sizeof ifgrq); 1350 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1351 sizeof(ifgrq.ifgrq_member)); 1352 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1353 IFNET_RUNLOCK(); 1354 return (error); 1355 } 1356 len -= sizeof(ifgrq); 1357 ifgp++; 1358 } 1359 IFNET_RUNLOCK(); 1360 1361 return (0); 1362} 1363 1364/* 1365 * Delete Routes for a Network Interface 1366 * 1367 * Called for each routing entry via the rnh->rnh_walktree() call above 1368 * to delete all route entries referencing a detaching network interface. 1369 * 1370 * Arguments: 1371 * rn pointer to node in the routing table 1372 * arg argument passed to rnh->rnh_walktree() - detaching interface 1373 * 1374 * Returns: 1375 * 0 successful 1376 * errno failed - reason indicated 1377 * 1378 */ 1379static int 1380if_rtdel(struct radix_node *rn, void *arg) 1381{ 1382 struct rtentry *rt = (struct rtentry *)rn; 1383 struct ifnet *ifp = arg; 1384 int err; 1385 1386 if (rt->rt_ifp == ifp) { 1387 1388 /* 1389 * Protect (sorta) against walktree recursion problems 1390 * with cloned routes 1391 */ 1392 if ((rt->rt_flags & RTF_UP) == 0) 1393 return (0); 1394 1395 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1396 rt_mask(rt), 1397 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED, 1398 (struct rtentry **) NULL, rt->rt_fibnum); 1399 if (err) { 1400 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1401 } 1402 } 1403 1404 return (0); 1405} 1406 1407/* 1408 * Wrapper functions for struct ifnet address list locking macros. These are 1409 * used by kernel modules to avoid encoding programming interface or binary 1410 * interface assumptions that may be violated when kernel-internal locking 1411 * approaches change. 1412 */ 1413void 1414if_addr_rlock(struct ifnet *ifp) 1415{ 1416 1417 IF_ADDR_RLOCK(ifp); 1418} 1419 1420void 1421if_addr_runlock(struct ifnet *ifp) 1422{ 1423 1424 IF_ADDR_RUNLOCK(ifp); 1425} 1426 1427void 1428if_maddr_rlock(struct ifnet *ifp) 1429{ 1430 1431 IF_ADDR_RLOCK(ifp); 1432} 1433 1434void 1435if_maddr_runlock(struct ifnet *ifp) 1436{ 1437 1438 IF_ADDR_RUNLOCK(ifp); 1439} 1440 1441/* 1442 * Reference count functions for ifaddrs. 1443 */ 1444void 1445ifa_init(struct ifaddr *ifa) 1446{ 1447 1448 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1449 refcount_init(&ifa->ifa_refcnt, 1); 1450} 1451 1452void 1453ifa_ref(struct ifaddr *ifa) 1454{ 1455 1456 refcount_acquire(&ifa->ifa_refcnt); 1457} 1458 1459void 1460ifa_free(struct ifaddr *ifa) 1461{ 1462 1463 if (refcount_release(&ifa->ifa_refcnt)) { 1464 mtx_destroy(&ifa->ifa_mtx); 1465 free(ifa, M_IFADDR); 1466 } 1467} 1468 1469int 1470ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1471{ 1472 int error = 0; 1473 struct rtentry *rt = NULL; 1474 struct rt_addrinfo info; 1475 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1476 1477 bzero(&info, sizeof(info)); 1478 info.rti_ifp = V_loif; 1479 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1480 info.rti_info[RTAX_DST] = ia; 1481 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1482 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1483 1484 if (error == 0 && rt != NULL) { 1485 RT_LOCK(rt); 1486 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1487 ifa->ifa_ifp->if_type; 1488 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1489 ifa->ifa_ifp->if_index; 1490 RT_REMREF(rt); 1491 RT_UNLOCK(rt); 1492 } else if (error != 0) 1493 log(LOG_INFO, "ifa_add_loopback_route: insertion failed\n"); 1494 1495 return (error); 1496} 1497 1498int 1499ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1500{ 1501 int error = 0; 1502 struct rt_addrinfo info; 1503 struct sockaddr_dl null_sdl; 1504 1505 bzero(&null_sdl, sizeof(null_sdl)); 1506 null_sdl.sdl_len = sizeof(null_sdl); 1507 null_sdl.sdl_family = AF_LINK; 1508 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1509 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1510 bzero(&info, sizeof(info)); 1511 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1512 info.rti_info[RTAX_DST] = ia; 1513 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1514 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1515 1516 if (error != 0) 1517 log(LOG_INFO, "ifa_del_loopback_route: deletion failed\n"); 1518 1519 return (error); 1520} 1521 1522/* 1523 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1524 * structs used to represent other address families, it is necessary 1525 * to perform a different comparison. 1526 */ 1527 1528#define sa_equal(a1, a2) \ 1529 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1530 1531#define sa_dl_equal(a1, a2) \ 1532 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1533 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1534 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1535 LLADDR((struct sockaddr_dl *)(a2)), \ 1536 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1537 1538/* 1539 * Locate an interface based on a complete address. 1540 */ 1541/*ARGSUSED*/ 1542static struct ifaddr * 1543ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1544{ 1545 struct ifnet *ifp; 1546 struct ifaddr *ifa; 1547 1548 IFNET_RLOCK_NOSLEEP(); 1549 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1550 IF_ADDR_RLOCK(ifp); 1551 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1552 if (ifa->ifa_addr->sa_family != addr->sa_family) 1553 continue; 1554 if (sa_equal(addr, ifa->ifa_addr)) { 1555 if (getref) 1556 ifa_ref(ifa); 1557 IF_ADDR_RUNLOCK(ifp); 1558 goto done; 1559 } 1560 /* IP6 doesn't have broadcast */ 1561 if ((ifp->if_flags & IFF_BROADCAST) && 1562 ifa->ifa_broadaddr && 1563 ifa->ifa_broadaddr->sa_len != 0 && 1564 sa_equal(ifa->ifa_broadaddr, addr)) { 1565 if (getref) 1566 ifa_ref(ifa); 1567 IF_ADDR_RUNLOCK(ifp); 1568 goto done; 1569 } 1570 } 1571 IF_ADDR_RUNLOCK(ifp); 1572 } 1573 ifa = NULL; 1574done: 1575 IFNET_RUNLOCK_NOSLEEP(); 1576 return (ifa); 1577} 1578 1579struct ifaddr * 1580ifa_ifwithaddr(struct sockaddr *addr) 1581{ 1582 1583 return (ifa_ifwithaddr_internal(addr, 1)); 1584} 1585 1586int 1587ifa_ifwithaddr_check(struct sockaddr *addr) 1588{ 1589 1590 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1591} 1592 1593/* 1594 * Locate an interface based on the broadcast address. 1595 */ 1596/* ARGSUSED */ 1597struct ifaddr * 1598ifa_ifwithbroadaddr(struct sockaddr *addr) 1599{ 1600 struct ifnet *ifp; 1601 struct ifaddr *ifa; 1602 1603 IFNET_RLOCK_NOSLEEP(); 1604 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1605 IF_ADDR_RLOCK(ifp); 1606 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1607 if (ifa->ifa_addr->sa_family != addr->sa_family) 1608 continue; 1609 if ((ifp->if_flags & IFF_BROADCAST) && 1610 ifa->ifa_broadaddr && 1611 ifa->ifa_broadaddr->sa_len != 0 && 1612 sa_equal(ifa->ifa_broadaddr, addr)) { 1613 ifa_ref(ifa); 1614 IF_ADDR_RUNLOCK(ifp); 1615 goto done; 1616 } 1617 } 1618 IF_ADDR_RUNLOCK(ifp); 1619 } 1620 ifa = NULL; 1621done: 1622 IFNET_RUNLOCK_NOSLEEP(); 1623 return (ifa); 1624} 1625 1626/* 1627 * Locate the point to point interface with a given destination address. 1628 */ 1629/*ARGSUSED*/ 1630struct ifaddr * 1631ifa_ifwithdstaddr(struct sockaddr *addr) 1632{ 1633 struct ifnet *ifp; 1634 struct ifaddr *ifa; 1635 1636 IFNET_RLOCK_NOSLEEP(); 1637 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1638 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1639 continue; 1640 IF_ADDR_RLOCK(ifp); 1641 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1642 if (ifa->ifa_addr->sa_family != addr->sa_family) 1643 continue; 1644 if (ifa->ifa_dstaddr != NULL && 1645 sa_equal(addr, ifa->ifa_dstaddr)) { 1646 ifa_ref(ifa); 1647 IF_ADDR_RUNLOCK(ifp); 1648 goto done; 1649 } 1650 } 1651 IF_ADDR_RUNLOCK(ifp); 1652 } 1653 ifa = NULL; 1654done: 1655 IFNET_RUNLOCK_NOSLEEP(); 1656 return (ifa); 1657} 1658 1659/* 1660 * Find an interface on a specific network. If many, choice 1661 * is most specific found. 1662 */ 1663struct ifaddr * 1664ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1665{ 1666 struct ifnet *ifp; 1667 struct ifaddr *ifa; 1668 struct ifaddr *ifa_maybe = NULL; 1669 u_int af = addr->sa_family; 1670 char *addr_data = addr->sa_data, *cplim; 1671 1672 /* 1673 * AF_LINK addresses can be looked up directly by their index number, 1674 * so do that if we can. 1675 */ 1676 if (af == AF_LINK) { 1677 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1678 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1679 return (ifaddr_byindex(sdl->sdl_index)); 1680 } 1681 1682 /* 1683 * Scan though each interface, looking for ones that have addresses 1684 * in this address family. Maintain a reference on ifa_maybe once 1685 * we find one, as we release the IF_ADDR_RLOCK() that kept it stable 1686 * when we move onto the next interface. 1687 */ 1688 IFNET_RLOCK_NOSLEEP(); 1689 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1690 IF_ADDR_RLOCK(ifp); 1691 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1692 char *cp, *cp2, *cp3; 1693 1694 if (ifa->ifa_addr->sa_family != af) 1695next: continue; 1696 if (af == AF_INET && 1697 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1698 /* 1699 * This is a bit broken as it doesn't 1700 * take into account that the remote end may 1701 * be a single node in the network we are 1702 * looking for. 1703 * The trouble is that we don't know the 1704 * netmask for the remote end. 1705 */ 1706 if (ifa->ifa_dstaddr != NULL && 1707 sa_equal(addr, ifa->ifa_dstaddr)) { 1708 ifa_ref(ifa); 1709 IF_ADDR_RUNLOCK(ifp); 1710 goto done; 1711 } 1712 } else { 1713 /* 1714 * if we have a special address handler, 1715 * then use it instead of the generic one. 1716 */ 1717 if (ifa->ifa_claim_addr) { 1718 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1719 ifa_ref(ifa); 1720 IF_ADDR_RUNLOCK(ifp); 1721 goto done; 1722 } 1723 continue; 1724 } 1725 1726 /* 1727 * Scan all the bits in the ifa's address. 1728 * If a bit dissagrees with what we are 1729 * looking for, mask it with the netmask 1730 * to see if it really matters. 1731 * (A byte at a time) 1732 */ 1733 if (ifa->ifa_netmask == 0) 1734 continue; 1735 cp = addr_data; 1736 cp2 = ifa->ifa_addr->sa_data; 1737 cp3 = ifa->ifa_netmask->sa_data; 1738 cplim = ifa->ifa_netmask->sa_len 1739 + (char *)ifa->ifa_netmask; 1740 while (cp3 < cplim) 1741 if ((*cp++ ^ *cp2++) & *cp3++) 1742 goto next; /* next address! */ 1743 /* 1744 * If the netmask of what we just found 1745 * is more specific than what we had before 1746 * (if we had one) then remember the new one 1747 * before continuing to search 1748 * for an even better one. 1749 */ 1750 if (ifa_maybe == NULL || 1751 rn_refines((caddr_t)ifa->ifa_netmask, 1752 (caddr_t)ifa_maybe->ifa_netmask)) { 1753 if (ifa_maybe != NULL) 1754 ifa_free(ifa_maybe); 1755 ifa_maybe = ifa; 1756 ifa_ref(ifa_maybe); 1757 } 1758 } 1759 } 1760 IF_ADDR_RUNLOCK(ifp); 1761 } 1762 ifa = ifa_maybe; 1763 ifa_maybe = NULL; 1764done: 1765 IFNET_RUNLOCK_NOSLEEP(); 1766 if (ifa_maybe != NULL) 1767 ifa_free(ifa_maybe); 1768 return (ifa); 1769} 1770 1771/* 1772 * Find an interface address specific to an interface best matching 1773 * a given address. 1774 */ 1775struct ifaddr * 1776ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1777{ 1778 struct ifaddr *ifa; 1779 char *cp, *cp2, *cp3; 1780 char *cplim; 1781 struct ifaddr *ifa_maybe = NULL; 1782 u_int af = addr->sa_family; 1783 1784 if (af >= AF_MAX) 1785 return (NULL); 1786 IF_ADDR_RLOCK(ifp); 1787 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1788 if (ifa->ifa_addr->sa_family != af) 1789 continue; 1790 if (ifa_maybe == NULL) 1791 ifa_maybe = ifa; 1792 if (ifa->ifa_netmask == 0) { 1793 if (sa_equal(addr, ifa->ifa_addr) || 1794 (ifa->ifa_dstaddr && 1795 sa_equal(addr, ifa->ifa_dstaddr))) 1796 goto done; 1797 continue; 1798 } 1799 if (ifp->if_flags & IFF_POINTOPOINT) { 1800 if (sa_equal(addr, ifa->ifa_dstaddr)) 1801 goto done; 1802 } else { 1803 cp = addr->sa_data; 1804 cp2 = ifa->ifa_addr->sa_data; 1805 cp3 = ifa->ifa_netmask->sa_data; 1806 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1807 for (; cp3 < cplim; cp3++) 1808 if ((*cp++ ^ *cp2++) & *cp3) 1809 break; 1810 if (cp3 == cplim) 1811 goto done; 1812 } 1813 } 1814 ifa = ifa_maybe; 1815done: 1816 if (ifa != NULL) 1817 ifa_ref(ifa); 1818 IF_ADDR_RUNLOCK(ifp); 1819 return (ifa); 1820} 1821 1822#include <net/if_llatbl.h> 1823 1824/* 1825 * Default action when installing a route with a Link Level gateway. 1826 * Lookup an appropriate real ifa to point to. 1827 * This should be moved to /sys/net/link.c eventually. 1828 */ 1829static void 1830link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1831{ 1832 struct ifaddr *ifa, *oifa; 1833 struct sockaddr *dst; 1834 struct ifnet *ifp; 1835 1836 RT_LOCK_ASSERT(rt); 1837 1838 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1839 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1840 return; 1841 ifa = ifaof_ifpforaddr(dst, ifp); 1842 if (ifa) { 1843 oifa = rt->rt_ifa; 1844 rt->rt_ifa = ifa; 1845 ifa_free(oifa); 1846 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1847 ifa->ifa_rtrequest(cmd, rt, info); 1848 } 1849} 1850 1851/* 1852 * Mark an interface down and notify protocols of 1853 * the transition. 1854 * NOTE: must be called at splnet or eqivalent. 1855 */ 1856static void 1857if_unroute(struct ifnet *ifp, int flag, int fam) 1858{ 1859 struct ifaddr *ifa; 1860 1861 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1862 1863 ifp->if_flags &= ~flag; 1864 getmicrotime(&ifp->if_lastchange); 1865 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1866 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1867 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1868 ifp->if_qflush(ifp); 1869 1870 if (ifp->if_carp) 1871 (*carp_linkstate_p)(ifp); 1872 rt_ifmsg(ifp); 1873} 1874 1875/* 1876 * Mark an interface up and notify protocols of 1877 * the transition. 1878 * NOTE: must be called at splnet or eqivalent. 1879 */ 1880static void 1881if_route(struct ifnet *ifp, int flag, int fam) 1882{ 1883 struct ifaddr *ifa; 1884 1885 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1886 1887 ifp->if_flags |= flag; 1888 getmicrotime(&ifp->if_lastchange); 1889 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1890 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1891 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1892 if (ifp->if_carp) 1893 (*carp_linkstate_p)(ifp); 1894 rt_ifmsg(ifp); 1895#ifdef INET6 1896 in6_if_up(ifp); 1897#endif 1898} 1899 1900void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1901void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1902struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1903struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1904int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1905int (*vlan_setcookie_p)(struct ifnet *, void *); 1906void *(*vlan_cookie_p)(struct ifnet *); 1907 1908/* 1909 * Handle a change in the interface link state. To avoid LORs 1910 * between driver lock and upper layer locks, as well as possible 1911 * recursions, we post event to taskqueue, and all job 1912 * is done in static do_link_state_change(). 1913 */ 1914void 1915if_link_state_change(struct ifnet *ifp, int link_state) 1916{ 1917 /* Return if state hasn't changed. */ 1918 if (ifp->if_link_state == link_state) 1919 return; 1920 1921 ifp->if_link_state = link_state; 1922 1923 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1924} 1925 1926static void 1927do_link_state_change(void *arg, int pending) 1928{ 1929 struct ifnet *ifp = (struct ifnet *)arg; 1930 int link_state = ifp->if_link_state; 1931 CURVNET_SET(ifp->if_vnet); 1932 1933 /* Notify that the link state has changed. */ 1934 rt_ifmsg(ifp); 1935 if (ifp->if_vlantrunk != NULL) 1936 (*vlan_link_state_p)(ifp); 1937 1938 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1939 IFP2AC(ifp)->ac_netgraph != NULL) 1940 (*ng_ether_link_state_p)(ifp, link_state); 1941 if (ifp->if_carp) 1942 (*carp_linkstate_p)(ifp); 1943 if (ifp->if_bridge) 1944 (*bridge_linkstate_p)(ifp); 1945 if (ifp->if_lagg) 1946 (*lagg_linkstate_p)(ifp, link_state); 1947 1948 if (IS_DEFAULT_VNET(curvnet)) 1949 devctl_notify("IFNET", ifp->if_xname, 1950 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1951 NULL); 1952 if (pending > 1) 1953 if_printf(ifp, "%d link states coalesced\n", pending); 1954 if (log_link_state_change) 1955 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1956 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1957 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 1958 CURVNET_RESTORE(); 1959} 1960 1961/* 1962 * Mark an interface down and notify protocols of 1963 * the transition. 1964 * NOTE: must be called at splnet or eqivalent. 1965 */ 1966void 1967if_down(struct ifnet *ifp) 1968{ 1969 1970 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1971} 1972 1973/* 1974 * Mark an interface up and notify protocols of 1975 * the transition. 1976 * NOTE: must be called at splnet or eqivalent. 1977 */ 1978void 1979if_up(struct ifnet *ifp) 1980{ 1981 1982 if_route(ifp, IFF_UP, AF_UNSPEC); 1983} 1984 1985/* 1986 * Flush an interface queue. 1987 */ 1988void 1989if_qflush(struct ifnet *ifp) 1990{ 1991 struct mbuf *m, *n; 1992 struct ifaltq *ifq; 1993 1994 ifq = &ifp->if_snd; 1995 IFQ_LOCK(ifq); 1996#ifdef ALTQ 1997 if (ALTQ_IS_ENABLED(ifq)) 1998 ALTQ_PURGE(ifq); 1999#endif 2000 n = ifq->ifq_head; 2001 while ((m = n) != 0) { 2002 n = m->m_act; 2003 m_freem(m); 2004 } 2005 ifq->ifq_head = 0; 2006 ifq->ifq_tail = 0; 2007 ifq->ifq_len = 0; 2008 IFQ_UNLOCK(ifq); 2009} 2010 2011/* 2012 * Map interface name to interface structure pointer, with or without 2013 * returning a reference. 2014 */ 2015struct ifnet * 2016ifunit_ref(const char *name) 2017{ 2018 struct ifnet *ifp; 2019 2020 IFNET_RLOCK_NOSLEEP(); 2021 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2022 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2023 !(ifp->if_flags & IFF_DYING)) 2024 break; 2025 } 2026 if (ifp != NULL) 2027 if_ref(ifp); 2028 IFNET_RUNLOCK_NOSLEEP(); 2029 return (ifp); 2030} 2031 2032struct ifnet * 2033ifunit(const char *name) 2034{ 2035 struct ifnet *ifp; 2036 2037 IFNET_RLOCK_NOSLEEP(); 2038 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2039 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2040 break; 2041 } 2042 IFNET_RUNLOCK_NOSLEEP(); 2043 return (ifp); 2044} 2045 2046/* 2047 * Hardware specific interface ioctls. 2048 */ 2049static int 2050ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2051{ 2052 struct ifreq *ifr; 2053 struct ifstat *ifs; 2054 int error = 0; 2055 int new_flags, temp_flags; 2056 size_t namelen, onamelen; 2057 size_t descrlen; 2058 char *descrbuf, *odescrbuf; 2059 char new_name[IFNAMSIZ]; 2060 struct ifaddr *ifa; 2061 struct sockaddr_dl *sdl; 2062 2063 ifr = (struct ifreq *)data; 2064 switch (cmd) { 2065 case SIOCGIFINDEX: 2066 ifr->ifr_index = ifp->if_index; 2067 break; 2068 2069 case SIOCGIFFLAGS: 2070 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2071 ifr->ifr_flags = temp_flags & 0xffff; 2072 ifr->ifr_flagshigh = temp_flags >> 16; 2073 break; 2074 2075 case SIOCGIFCAP: 2076 ifr->ifr_reqcap = ifp->if_capabilities; 2077 ifr->ifr_curcap = ifp->if_capenable; 2078 break; 2079 2080#ifdef MAC 2081 case SIOCGIFMAC: 2082 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2083 break; 2084#endif 2085 2086 case SIOCGIFMETRIC: 2087 ifr->ifr_metric = ifp->if_metric; 2088 break; 2089 2090 case SIOCGIFMTU: 2091 ifr->ifr_mtu = ifp->if_mtu; 2092 break; 2093 2094 case SIOCGIFPHYS: 2095 ifr->ifr_phys = ifp->if_physical; 2096 break; 2097 2098 case SIOCGIFDESCR: 2099 error = 0; 2100 sx_slock(&ifdescr_sx); 2101 if (ifp->if_description == NULL) 2102 error = ENOMSG; 2103 else { 2104 /* space for terminating nul */ 2105 descrlen = strlen(ifp->if_description) + 1; 2106 if (ifr->ifr_buffer.length < descrlen) 2107 ifr->ifr_buffer.buffer = NULL; 2108 else 2109 error = copyout(ifp->if_description, 2110 ifr->ifr_buffer.buffer, descrlen); 2111 ifr->ifr_buffer.length = descrlen; 2112 } 2113 sx_sunlock(&ifdescr_sx); 2114 break; 2115 2116 case SIOCSIFDESCR: 2117 error = priv_check(td, PRIV_NET_SETIFDESCR); 2118 if (error) 2119 return (error); 2120 2121 /* 2122 * Copy only (length-1) bytes to make sure that 2123 * if_description is always nul terminated. The 2124 * length parameter is supposed to count the 2125 * terminating nul in. 2126 */ 2127 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2128 return (ENAMETOOLONG); 2129 else if (ifr->ifr_buffer.length == 0) 2130 descrbuf = NULL; 2131 else { 2132 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2133 M_WAITOK | M_ZERO); 2134 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2135 ifr->ifr_buffer.length - 1); 2136 if (error) { 2137 free(descrbuf, M_IFDESCR); 2138 break; 2139 } 2140 } 2141 2142 sx_xlock(&ifdescr_sx); 2143 odescrbuf = ifp->if_description; 2144 ifp->if_description = descrbuf; 2145 sx_xunlock(&ifdescr_sx); 2146 2147 getmicrotime(&ifp->if_lastchange); 2148 free(odescrbuf, M_IFDESCR); 2149 break; 2150 2151 case SIOCGIFFIB: 2152 ifr->ifr_fib = ifp->if_fib; 2153 break; 2154 2155 case SIOCSIFFIB: 2156 error = priv_check(td, PRIV_NET_SETIFFIB); 2157 if (error) 2158 return (error); 2159 if (ifr->ifr_fib >= rt_numfibs) 2160 return (EINVAL); 2161 2162 ifp->if_fib = ifr->ifr_fib; 2163 break; 2164 2165 case SIOCSIFFLAGS: 2166 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2167 if (error) 2168 return (error); 2169 /* 2170 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2171 * check, so we don't need special handling here yet. 2172 */ 2173 new_flags = (ifr->ifr_flags & 0xffff) | 2174 (ifr->ifr_flagshigh << 16); 2175 if (ifp->if_flags & IFF_SMART) { 2176 /* Smart drivers twiddle their own routes */ 2177 } else if (ifp->if_flags & IFF_UP && 2178 (new_flags & IFF_UP) == 0) { 2179 int s = splimp(); 2180 if_down(ifp); 2181 splx(s); 2182 } else if (new_flags & IFF_UP && 2183 (ifp->if_flags & IFF_UP) == 0) { 2184 int s = splimp(); 2185 if_up(ifp); 2186 splx(s); 2187 } 2188 /* See if permanently promiscuous mode bit is about to flip */ 2189 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2190 if (new_flags & IFF_PPROMISC) 2191 ifp->if_flags |= IFF_PROMISC; 2192 else if (ifp->if_pcount == 0) 2193 ifp->if_flags &= ~IFF_PROMISC; 2194 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2195 ifp->if_xname, 2196 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2197 } 2198 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2199 (new_flags &~ IFF_CANTCHANGE); 2200 if (ifp->if_ioctl) { 2201 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2202 } 2203 getmicrotime(&ifp->if_lastchange); 2204 break; 2205 2206 case SIOCSIFCAP: 2207 error = priv_check(td, PRIV_NET_SETIFCAP); 2208 if (error) 2209 return (error); 2210 if (ifp->if_ioctl == NULL) 2211 return (EOPNOTSUPP); 2212 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2213 return (EINVAL); 2214 error = (*ifp->if_ioctl)(ifp, cmd, data); 2215 if (error == 0) 2216 getmicrotime(&ifp->if_lastchange); 2217 break; 2218 2219#ifdef MAC 2220 case SIOCSIFMAC: 2221 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2222 break; 2223#endif 2224 2225 case SIOCSIFNAME: 2226 error = priv_check(td, PRIV_NET_SETIFNAME); 2227 if (error) 2228 return (error); 2229 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2230 if (error != 0) 2231 return (error); 2232 if (new_name[0] == '\0') 2233 return (EINVAL); 2234 if (ifunit(new_name) != NULL) 2235 return (EEXIST); 2236 2237 /* 2238 * XXX: Locking. Nothing else seems to lock if_flags, 2239 * and there are numerous other races with the 2240 * ifunit() checks not being atomic with namespace 2241 * changes (renames, vmoves, if_attach, etc). 2242 */ 2243 ifp->if_flags |= IFF_RENAMING; 2244 2245 /* Announce the departure of the interface. */ 2246 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2247 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2248 2249 log(LOG_INFO, "%s: changing name to '%s'\n", 2250 ifp->if_xname, new_name); 2251 2252 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2253 ifa = ifp->if_addr; 2254 IFA_LOCK(ifa); 2255 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2256 namelen = strlen(new_name); 2257 onamelen = sdl->sdl_nlen; 2258 /* 2259 * Move the address if needed. This is safe because we 2260 * allocate space for a name of length IFNAMSIZ when we 2261 * create this in if_attach(). 2262 */ 2263 if (namelen != onamelen) { 2264 bcopy(sdl->sdl_data + onamelen, 2265 sdl->sdl_data + namelen, sdl->sdl_alen); 2266 } 2267 bcopy(new_name, sdl->sdl_data, namelen); 2268 sdl->sdl_nlen = namelen; 2269 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2270 bzero(sdl->sdl_data, onamelen); 2271 while (namelen != 0) 2272 sdl->sdl_data[--namelen] = 0xff; 2273 IFA_UNLOCK(ifa); 2274 2275 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2276 /* Announce the return of the interface. */ 2277 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2278 2279 ifp->if_flags &= ~IFF_RENAMING; 2280 break; 2281 2282#ifdef VIMAGE 2283 case SIOCSIFVNET: 2284 error = priv_check(td, PRIV_NET_SETIFVNET); 2285 if (error) 2286 return (error); 2287 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2288 break; 2289#endif 2290 2291 case SIOCSIFMETRIC: 2292 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2293 if (error) 2294 return (error); 2295 ifp->if_metric = ifr->ifr_metric; 2296 getmicrotime(&ifp->if_lastchange); 2297 break; 2298 2299 case SIOCSIFPHYS: 2300 error = priv_check(td, PRIV_NET_SETIFPHYS); 2301 if (error) 2302 return (error); 2303 if (ifp->if_ioctl == NULL) 2304 return (EOPNOTSUPP); 2305 error = (*ifp->if_ioctl)(ifp, cmd, data); 2306 if (error == 0) 2307 getmicrotime(&ifp->if_lastchange); 2308 break; 2309 2310 case SIOCSIFMTU: 2311 { 2312 u_long oldmtu = ifp->if_mtu; 2313 2314 error = priv_check(td, PRIV_NET_SETIFMTU); 2315 if (error) 2316 return (error); 2317 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2318 return (EINVAL); 2319 if (ifp->if_ioctl == NULL) 2320 return (EOPNOTSUPP); 2321 error = (*ifp->if_ioctl)(ifp, cmd, data); 2322 if (error == 0) { 2323 getmicrotime(&ifp->if_lastchange); 2324 rt_ifmsg(ifp); 2325 } 2326 /* 2327 * If the link MTU changed, do network layer specific procedure. 2328 */ 2329 if (ifp->if_mtu != oldmtu) { 2330#ifdef INET6 2331 nd6_setmtu(ifp); 2332#endif 2333 } 2334 break; 2335 } 2336 2337 case SIOCADDMULTI: 2338 case SIOCDELMULTI: 2339 if (cmd == SIOCADDMULTI) 2340 error = priv_check(td, PRIV_NET_ADDMULTI); 2341 else 2342 error = priv_check(td, PRIV_NET_DELMULTI); 2343 if (error) 2344 return (error); 2345 2346 /* Don't allow group membership on non-multicast interfaces. */ 2347 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2348 return (EOPNOTSUPP); 2349 2350 /* Don't let users screw up protocols' entries. */ 2351 if (ifr->ifr_addr.sa_family != AF_LINK) 2352 return (EINVAL); 2353 2354 if (cmd == SIOCADDMULTI) { 2355 struct ifmultiaddr *ifma; 2356 2357 /* 2358 * Userland is only permitted to join groups once 2359 * via the if_addmulti() KPI, because it cannot hold 2360 * struct ifmultiaddr * between calls. It may also 2361 * lose a race while we check if the membership 2362 * already exists. 2363 */ 2364 IF_ADDR_RLOCK(ifp); 2365 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2366 IF_ADDR_RUNLOCK(ifp); 2367 if (ifma != NULL) 2368 error = EADDRINUSE; 2369 else 2370 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2371 } else { 2372 error = if_delmulti(ifp, &ifr->ifr_addr); 2373 } 2374 if (error == 0) 2375 getmicrotime(&ifp->if_lastchange); 2376 break; 2377 2378 case SIOCSIFPHYADDR: 2379 case SIOCDIFPHYADDR: 2380#ifdef INET6 2381 case SIOCSIFPHYADDR_IN6: 2382#endif 2383 case SIOCSLIFPHYADDR: 2384 case SIOCSIFMEDIA: 2385 case SIOCSIFGENERIC: 2386 error = priv_check(td, PRIV_NET_HWIOCTL); 2387 if (error) 2388 return (error); 2389 if (ifp->if_ioctl == NULL) 2390 return (EOPNOTSUPP); 2391 error = (*ifp->if_ioctl)(ifp, cmd, data); 2392 if (error == 0) 2393 getmicrotime(&ifp->if_lastchange); 2394 break; 2395 2396 case SIOCGIFSTATUS: 2397 ifs = (struct ifstat *)data; 2398 ifs->ascii[0] = '\0'; 2399 2400 case SIOCGIFPSRCADDR: 2401 case SIOCGIFPDSTADDR: 2402 case SIOCGLIFPHYADDR: 2403 case SIOCGIFMEDIA: 2404 case SIOCGIFGENERIC: 2405 if (ifp->if_ioctl == NULL) 2406 return (EOPNOTSUPP); 2407 error = (*ifp->if_ioctl)(ifp, cmd, data); 2408 break; 2409 2410 case SIOCSIFLLADDR: 2411 error = priv_check(td, PRIV_NET_SETLLADDR); 2412 if (error) 2413 return (error); 2414 error = if_setlladdr(ifp, 2415 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2416 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2417 break; 2418 2419 case SIOCAIFGROUP: 2420 { 2421 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2422 2423 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2424 if (error) 2425 return (error); 2426 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2427 return (error); 2428 break; 2429 } 2430 2431 case SIOCGIFGROUP: 2432 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2433 return (error); 2434 break; 2435 2436 case SIOCDIFGROUP: 2437 { 2438 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2439 2440 error = priv_check(td, PRIV_NET_DELIFGROUP); 2441 if (error) 2442 return (error); 2443 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2444 return (error); 2445 break; 2446 } 2447 2448 default: 2449 error = ENOIOCTL; 2450 break; 2451 } 2452 return (error); 2453} 2454 2455#ifdef COMPAT_FREEBSD32 2456struct ifconf32 { 2457 int32_t ifc_len; 2458 union { 2459 uint32_t ifcu_buf; 2460 uint32_t ifcu_req; 2461 } ifc_ifcu; 2462}; 2463#define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2464#endif 2465 2466/* 2467 * Interface ioctls. 2468 */ 2469int 2470ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2471{ 2472 struct ifnet *ifp; 2473 struct ifreq *ifr; 2474 int error; 2475 int oif_flags; 2476 2477 CURVNET_SET(so->so_vnet); 2478 switch (cmd) { 2479 case SIOCGIFCONF: 2480 case OSIOCGIFCONF: 2481 error = ifconf(cmd, data); 2482 CURVNET_RESTORE(); 2483 return (error); 2484 2485#ifdef COMPAT_FREEBSD32 2486 case SIOCGIFCONF32: 2487 { 2488 struct ifconf32 *ifc32; 2489 struct ifconf ifc; 2490 2491 ifc32 = (struct ifconf32 *)data; 2492 ifc.ifc_len = ifc32->ifc_len; 2493 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2494 2495 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2496 CURVNET_RESTORE(); 2497 if (error == 0) 2498 ifc32->ifc_len = ifc.ifc_len; 2499 return (error); 2500 } 2501#endif 2502 } 2503 ifr = (struct ifreq *)data; 2504 2505 switch (cmd) { 2506#ifdef VIMAGE 2507 case SIOCSIFRVNET: 2508 error = priv_check(td, PRIV_NET_SETIFVNET); 2509 if (error == 0) 2510 error = if_vmove_reclaim(td, ifr->ifr_name, 2511 ifr->ifr_jid); 2512 CURVNET_RESTORE(); 2513 return (error); 2514#endif 2515 case SIOCIFCREATE: 2516 case SIOCIFCREATE2: 2517 error = priv_check(td, PRIV_NET_IFCREATE); 2518 if (error == 0) 2519 error = if_clone_create(ifr->ifr_name, 2520 sizeof(ifr->ifr_name), 2521 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2522 CURVNET_RESTORE(); 2523 return (error); 2524 case SIOCIFDESTROY: 2525 error = priv_check(td, PRIV_NET_IFDESTROY); 2526 if (error == 0) 2527 error = if_clone_destroy(ifr->ifr_name); 2528 CURVNET_RESTORE(); 2529 return (error); 2530 2531 case SIOCIFGCLONERS: 2532 error = if_clone_list((struct if_clonereq *)data); 2533 CURVNET_RESTORE(); 2534 return (error); 2535 case SIOCGIFGMEMB: 2536 error = if_getgroupmembers((struct ifgroupreq *)data); 2537 CURVNET_RESTORE(); 2538 return (error); 2539 } 2540 2541 ifp = ifunit_ref(ifr->ifr_name); 2542 if (ifp == NULL) { 2543 CURVNET_RESTORE(); 2544 return (ENXIO); 2545 } 2546 2547 error = ifhwioctl(cmd, ifp, data, td); 2548 if (error != ENOIOCTL) { 2549 if_rele(ifp); 2550 CURVNET_RESTORE(); 2551 return (error); 2552 } 2553 2554 oif_flags = ifp->if_flags; 2555 if (so->so_proto == NULL) { 2556 if_rele(ifp); 2557 CURVNET_RESTORE(); 2558 return (EOPNOTSUPP); 2559 } 2560 2561 /* 2562 * Pass the request on to the socket control method, and if the 2563 * latter returns EOPNOTSUPP, directly to the interface. 2564 * 2565 * Make an exception for the legacy SIOCSIF* requests. Drivers 2566 * trust SIOCSIFADDR et al to come from an already privileged 2567 * layer, and do not perform any credentials checks or input 2568 * validation. 2569 */ 2570#ifndef COMPAT_43 2571 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2572 data, 2573 ifp, td)); 2574 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 2575 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 2576 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 2577 error = (*ifp->if_ioctl)(ifp, cmd, data); 2578#else 2579 { 2580 u_long ocmd = cmd; 2581 2582 switch (cmd) { 2583 2584 case SIOCSIFDSTADDR: 2585 case SIOCSIFADDR: 2586 case SIOCSIFBRDADDR: 2587 case SIOCSIFNETMASK: 2588#if BYTE_ORDER != BIG_ENDIAN 2589 if (ifr->ifr_addr.sa_family == 0 && 2590 ifr->ifr_addr.sa_len < 16) { 2591 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2592 ifr->ifr_addr.sa_len = 16; 2593 } 2594#else 2595 if (ifr->ifr_addr.sa_len == 0) 2596 ifr->ifr_addr.sa_len = 16; 2597#endif 2598 break; 2599 2600 case OSIOCGIFADDR: 2601 cmd = SIOCGIFADDR; 2602 break; 2603 2604 case OSIOCGIFDSTADDR: 2605 cmd = SIOCGIFDSTADDR; 2606 break; 2607 2608 case OSIOCGIFBRDADDR: 2609 cmd = SIOCGIFBRDADDR; 2610 break; 2611 2612 case OSIOCGIFNETMASK: 2613 cmd = SIOCGIFNETMASK; 2614 } 2615 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2616 cmd, 2617 data, 2618 ifp, td)); 2619 if (error == EOPNOTSUPP && ifp != NULL && 2620 ifp->if_ioctl != NULL && 2621 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 2622 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 2623 error = (*ifp->if_ioctl)(ifp, cmd, data); 2624 switch (ocmd) { 2625 2626 case OSIOCGIFADDR: 2627 case OSIOCGIFDSTADDR: 2628 case OSIOCGIFBRDADDR: 2629 case OSIOCGIFNETMASK: 2630 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2631 2632 } 2633 } 2634#endif /* COMPAT_43 */ 2635 2636 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2637#ifdef INET6 2638 if (ifp->if_flags & IFF_UP) { 2639 int s = splimp(); 2640 in6_if_up(ifp); 2641 splx(s); 2642 } 2643#endif 2644 } 2645 if_rele(ifp); 2646 CURVNET_RESTORE(); 2647 return (error); 2648} 2649 2650/* 2651 * The code common to handling reference counted flags, 2652 * e.g., in ifpromisc() and if_allmulti(). 2653 * The "pflag" argument can specify a permanent mode flag to check, 2654 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2655 * 2656 * Only to be used on stack-owned flags, not driver-owned flags. 2657 */ 2658static int 2659if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2660{ 2661 struct ifreq ifr; 2662 int error; 2663 int oldflags, oldcount; 2664 2665 /* Sanity checks to catch programming errors */ 2666 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2667 ("%s: setting driver-owned flag %d", __func__, flag)); 2668 2669 if (onswitch) 2670 KASSERT(*refcount >= 0, 2671 ("%s: increment negative refcount %d for flag %d", 2672 __func__, *refcount, flag)); 2673 else 2674 KASSERT(*refcount > 0, 2675 ("%s: decrement non-positive refcount %d for flag %d", 2676 __func__, *refcount, flag)); 2677 2678 /* In case this mode is permanent, just touch refcount */ 2679 if (ifp->if_flags & pflag) { 2680 *refcount += onswitch ? 1 : -1; 2681 return (0); 2682 } 2683 2684 /* Save ifnet parameters for if_ioctl() may fail */ 2685 oldcount = *refcount; 2686 oldflags = ifp->if_flags; 2687 2688 /* 2689 * See if we aren't the only and touching refcount is enough. 2690 * Actually toggle interface flag if we are the first or last. 2691 */ 2692 if (onswitch) { 2693 if ((*refcount)++) 2694 return (0); 2695 ifp->if_flags |= flag; 2696 } else { 2697 if (--(*refcount)) 2698 return (0); 2699 ifp->if_flags &= ~flag; 2700 } 2701 2702 /* Call down the driver since we've changed interface flags */ 2703 if (ifp->if_ioctl == NULL) { 2704 error = EOPNOTSUPP; 2705 goto recover; 2706 } 2707 ifr.ifr_flags = ifp->if_flags & 0xffff; 2708 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2709 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2710 if (error) 2711 goto recover; 2712 /* Notify userland that interface flags have changed */ 2713 rt_ifmsg(ifp); 2714 return (0); 2715 2716recover: 2717 /* Recover after driver error */ 2718 *refcount = oldcount; 2719 ifp->if_flags = oldflags; 2720 return (error); 2721} 2722 2723/* 2724 * Set/clear promiscuous mode on interface ifp based on the truth value 2725 * of pswitch. The calls are reference counted so that only the first 2726 * "on" request actually has an effect, as does the final "off" request. 2727 * Results are undefined if the "off" and "on" requests are not matched. 2728 */ 2729int 2730ifpromisc(struct ifnet *ifp, int pswitch) 2731{ 2732 int error; 2733 int oldflags = ifp->if_flags; 2734 2735 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2736 &ifp->if_pcount, pswitch); 2737 /* If promiscuous mode status has changed, log a message */ 2738 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2739 log(LOG_INFO, "%s: promiscuous mode %s\n", 2740 ifp->if_xname, 2741 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2742 return (error); 2743} 2744 2745/* 2746 * Return interface configuration 2747 * of system. List may be used 2748 * in later ioctl's (above) to get 2749 * other information. 2750 */ 2751/*ARGSUSED*/ 2752static int 2753ifconf(u_long cmd, caddr_t data) 2754{ 2755 struct ifconf *ifc = (struct ifconf *)data; 2756 struct ifnet *ifp; 2757 struct ifaddr *ifa; 2758 struct ifreq ifr; 2759 struct sbuf *sb; 2760 int error, full = 0, valid_len, max_len; 2761 2762 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2763 max_len = MAXPHYS - 1; 2764 2765 /* Prevent hostile input from being able to crash the system */ 2766 if (ifc->ifc_len <= 0) 2767 return (EINVAL); 2768 2769again: 2770 if (ifc->ifc_len <= max_len) { 2771 max_len = ifc->ifc_len; 2772 full = 1; 2773 } 2774 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2775 max_len = 0; 2776 valid_len = 0; 2777 2778 IFNET_RLOCK(); 2779 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2780 int addrs; 2781 2782 /* 2783 * Zero the ifr_name buffer to make sure we don't 2784 * disclose the contents of the stack. 2785 */ 2786 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2787 2788 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2789 >= sizeof(ifr.ifr_name)) { 2790 sbuf_delete(sb); 2791 IFNET_RUNLOCK(); 2792 return (ENAMETOOLONG); 2793 } 2794 2795 addrs = 0; 2796 IF_ADDR_RLOCK(ifp); 2797 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2798 struct sockaddr *sa = ifa->ifa_addr; 2799 2800 if (prison_if(curthread->td_ucred, sa) != 0) 2801 continue; 2802 addrs++; 2803#ifdef COMPAT_43 2804 if (cmd == OSIOCGIFCONF) { 2805 struct osockaddr *osa = 2806 (struct osockaddr *)&ifr.ifr_addr; 2807 ifr.ifr_addr = *sa; 2808 osa->sa_family = sa->sa_family; 2809 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2810 max_len += sizeof(ifr); 2811 } else 2812#endif 2813 if (sa->sa_len <= sizeof(*sa)) { 2814 ifr.ifr_addr = *sa; 2815 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2816 max_len += sizeof(ifr); 2817 } else { 2818 sbuf_bcat(sb, &ifr, 2819 offsetof(struct ifreq, ifr_addr)); 2820 max_len += offsetof(struct ifreq, ifr_addr); 2821 sbuf_bcat(sb, sa, sa->sa_len); 2822 max_len += sa->sa_len; 2823 } 2824 2825 if (sbuf_error(sb) == 0) 2826 valid_len = sbuf_len(sb); 2827 } 2828 IF_ADDR_RUNLOCK(ifp); 2829 if (addrs == 0) { 2830 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2831 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2832 max_len += sizeof(ifr); 2833 2834 if (sbuf_error(sb) == 0) 2835 valid_len = sbuf_len(sb); 2836 } 2837 } 2838 IFNET_RUNLOCK(); 2839 2840 /* 2841 * If we didn't allocate enough space (uncommon), try again. If 2842 * we have already allocated as much space as we are allowed, 2843 * return what we've got. 2844 */ 2845 if (valid_len != max_len && !full) { 2846 sbuf_delete(sb); 2847 goto again; 2848 } 2849 2850 ifc->ifc_len = valid_len; 2851 sbuf_finish(sb); 2852 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2853 sbuf_delete(sb); 2854 return (error); 2855} 2856 2857/* 2858 * Just like ifpromisc(), but for all-multicast-reception mode. 2859 */ 2860int 2861if_allmulti(struct ifnet *ifp, int onswitch) 2862{ 2863 2864 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2865} 2866 2867struct ifmultiaddr * 2868if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2869{ 2870 struct ifmultiaddr *ifma; 2871 2872 IF_ADDR_LOCK_ASSERT(ifp); 2873 2874 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2875 if (sa->sa_family == AF_LINK) { 2876 if (sa_dl_equal(ifma->ifma_addr, sa)) 2877 break; 2878 } else { 2879 if (sa_equal(ifma->ifma_addr, sa)) 2880 break; 2881 } 2882 } 2883 2884 return ifma; 2885} 2886 2887/* 2888 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2889 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2890 * the ifnet multicast address list here, so the caller must do that and 2891 * other setup work (such as notifying the device driver). The reference 2892 * count is initialized to 1. 2893 */ 2894static struct ifmultiaddr * 2895if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2896 int mflags) 2897{ 2898 struct ifmultiaddr *ifma; 2899 struct sockaddr *dupsa; 2900 2901 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2902 M_ZERO); 2903 if (ifma == NULL) 2904 return (NULL); 2905 2906 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2907 if (dupsa == NULL) { 2908 free(ifma, M_IFMADDR); 2909 return (NULL); 2910 } 2911 bcopy(sa, dupsa, sa->sa_len); 2912 ifma->ifma_addr = dupsa; 2913 2914 ifma->ifma_ifp = ifp; 2915 ifma->ifma_refcount = 1; 2916 ifma->ifma_protospec = NULL; 2917 2918 if (llsa == NULL) { 2919 ifma->ifma_lladdr = NULL; 2920 return (ifma); 2921 } 2922 2923 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2924 if (dupsa == NULL) { 2925 free(ifma->ifma_addr, M_IFMADDR); 2926 free(ifma, M_IFMADDR); 2927 return (NULL); 2928 } 2929 bcopy(llsa, dupsa, llsa->sa_len); 2930 ifma->ifma_lladdr = dupsa; 2931 2932 return (ifma); 2933} 2934 2935/* 2936 * if_freemulti: free ifmultiaddr structure and possibly attached related 2937 * addresses. The caller is responsible for implementing reference 2938 * counting, notifying the driver, handling routing messages, and releasing 2939 * any dependent link layer state. 2940 */ 2941static void 2942if_freemulti(struct ifmultiaddr *ifma) 2943{ 2944 2945 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2946 ifma->ifma_refcount)); 2947 KASSERT(ifma->ifma_protospec == NULL, 2948 ("if_freemulti: protospec not NULL")); 2949 2950 if (ifma->ifma_lladdr != NULL) 2951 free(ifma->ifma_lladdr, M_IFMADDR); 2952 free(ifma->ifma_addr, M_IFMADDR); 2953 free(ifma, M_IFMADDR); 2954} 2955 2956/* 2957 * Register an additional multicast address with a network interface. 2958 * 2959 * - If the address is already present, bump the reference count on the 2960 * address and return. 2961 * - If the address is not link-layer, look up a link layer address. 2962 * - Allocate address structures for one or both addresses, and attach to the 2963 * multicast address list on the interface. If automatically adding a link 2964 * layer address, the protocol address will own a reference to the link 2965 * layer address, to be freed when it is freed. 2966 * - Notify the network device driver of an addition to the multicast address 2967 * list. 2968 * 2969 * 'sa' points to caller-owned memory with the desired multicast address. 2970 * 2971 * 'retifma' will be used to return a pointer to the resulting multicast 2972 * address reference, if desired. 2973 */ 2974int 2975if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2976 struct ifmultiaddr **retifma) 2977{ 2978 struct ifmultiaddr *ifma, *ll_ifma; 2979 struct sockaddr *llsa; 2980 int error; 2981 2982 /* 2983 * If the address is already present, return a new reference to it; 2984 * otherwise, allocate storage and set up a new address. 2985 */ 2986 IF_ADDR_WLOCK(ifp); 2987 ifma = if_findmulti(ifp, sa); 2988 if (ifma != NULL) { 2989 ifma->ifma_refcount++; 2990 if (retifma != NULL) 2991 *retifma = ifma; 2992 IF_ADDR_WUNLOCK(ifp); 2993 return (0); 2994 } 2995 2996 /* 2997 * The address isn't already present; resolve the protocol address 2998 * into a link layer address, and then look that up, bump its 2999 * refcount or allocate an ifma for that also. If 'llsa' was 3000 * returned, we will need to free it later. 3001 */ 3002 llsa = NULL; 3003 ll_ifma = NULL; 3004 if (ifp->if_resolvemulti != NULL) { 3005 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3006 if (error) 3007 goto unlock_out; 3008 } 3009 3010 /* 3011 * Allocate the new address. Don't hook it up yet, as we may also 3012 * need to allocate a link layer multicast address. 3013 */ 3014 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3015 if (ifma == NULL) { 3016 error = ENOMEM; 3017 goto free_llsa_out; 3018 } 3019 3020 /* 3021 * If a link layer address is found, we'll need to see if it's 3022 * already present in the address list, or allocate is as well. 3023 * When this block finishes, the link layer address will be on the 3024 * list. 3025 */ 3026 if (llsa != NULL) { 3027 ll_ifma = if_findmulti(ifp, llsa); 3028 if (ll_ifma == NULL) { 3029 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3030 if (ll_ifma == NULL) { 3031 --ifma->ifma_refcount; 3032 if_freemulti(ifma); 3033 error = ENOMEM; 3034 goto free_llsa_out; 3035 } 3036 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3037 ifma_link); 3038 } else 3039 ll_ifma->ifma_refcount++; 3040 ifma->ifma_llifma = ll_ifma; 3041 } 3042 3043 /* 3044 * We now have a new multicast address, ifma, and possibly a new or 3045 * referenced link layer address. Add the primary address to the 3046 * ifnet address list. 3047 */ 3048 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3049 3050 if (retifma != NULL) 3051 *retifma = ifma; 3052 3053 /* 3054 * Must generate the message while holding the lock so that 'ifma' 3055 * pointer is still valid. 3056 */ 3057 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3058 IF_ADDR_WUNLOCK(ifp); 3059 3060 /* 3061 * We are certain we have added something, so call down to the 3062 * interface to let them know about it. 3063 */ 3064 if (ifp->if_ioctl != NULL) { 3065 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3066 } 3067 3068 if (llsa != NULL) 3069 free(llsa, M_IFMADDR); 3070 3071 return (0); 3072 3073free_llsa_out: 3074 if (llsa != NULL) 3075 free(llsa, M_IFMADDR); 3076 3077unlock_out: 3078 IF_ADDR_WUNLOCK(ifp); 3079 return (error); 3080} 3081 3082/* 3083 * Delete a multicast group membership by network-layer group address. 3084 * 3085 * Returns ENOENT if the entry could not be found. If ifp no longer 3086 * exists, results are undefined. This entry point should only be used 3087 * from subsystems which do appropriate locking to hold ifp for the 3088 * duration of the call. 3089 * Network-layer protocol domains must use if_delmulti_ifma(). 3090 */ 3091int 3092if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3093{ 3094 struct ifmultiaddr *ifma; 3095 int lastref; 3096#ifdef INVARIANTS 3097 struct ifnet *oifp; 3098 3099 IFNET_RLOCK_NOSLEEP(); 3100 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3101 if (ifp == oifp) 3102 break; 3103 if (ifp != oifp) 3104 ifp = NULL; 3105 IFNET_RUNLOCK_NOSLEEP(); 3106 3107 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3108#endif 3109 if (ifp == NULL) 3110 return (ENOENT); 3111 3112 IF_ADDR_WLOCK(ifp); 3113 lastref = 0; 3114 ifma = if_findmulti(ifp, sa); 3115 if (ifma != NULL) 3116 lastref = if_delmulti_locked(ifp, ifma, 0); 3117 IF_ADDR_WUNLOCK(ifp); 3118 3119 if (ifma == NULL) 3120 return (ENOENT); 3121 3122 if (lastref && ifp->if_ioctl != NULL) { 3123 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3124 } 3125 3126 return (0); 3127} 3128 3129/* 3130 * Delete all multicast group membership for an interface. 3131 * Should be used to quickly flush all multicast filters. 3132 */ 3133void 3134if_delallmulti(struct ifnet *ifp) 3135{ 3136 struct ifmultiaddr *ifma; 3137 struct ifmultiaddr *next; 3138 3139 IF_ADDR_WLOCK(ifp); 3140 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3141 if_delmulti_locked(ifp, ifma, 0); 3142 IF_ADDR_WUNLOCK(ifp); 3143} 3144 3145/* 3146 * Delete a multicast group membership by group membership pointer. 3147 * Network-layer protocol domains must use this routine. 3148 * 3149 * It is safe to call this routine if the ifp disappeared. 3150 */ 3151void 3152if_delmulti_ifma(struct ifmultiaddr *ifma) 3153{ 3154 struct ifnet *ifp; 3155 int lastref; 3156 3157 ifp = ifma->ifma_ifp; 3158#ifdef DIAGNOSTIC 3159 if (ifp == NULL) { 3160 printf("%s: ifma_ifp seems to be detached\n", __func__); 3161 } else { 3162 struct ifnet *oifp; 3163 3164 IFNET_RLOCK_NOSLEEP(); 3165 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3166 if (ifp == oifp) 3167 break; 3168 if (ifp != oifp) { 3169 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3170 ifp = NULL; 3171 } 3172 IFNET_RUNLOCK_NOSLEEP(); 3173 } 3174#endif 3175 /* 3176 * If and only if the ifnet instance exists: Acquire the address lock. 3177 */ 3178 if (ifp != NULL) 3179 IF_ADDR_WLOCK(ifp); 3180 3181 lastref = if_delmulti_locked(ifp, ifma, 0); 3182 3183 if (ifp != NULL) { 3184 /* 3185 * If and only if the ifnet instance exists: 3186 * Release the address lock. 3187 * If the group was left: update the hardware hash filter. 3188 */ 3189 IF_ADDR_WUNLOCK(ifp); 3190 if (lastref && ifp->if_ioctl != NULL) { 3191 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3192 } 3193 } 3194} 3195 3196/* 3197 * Perform deletion of network-layer and/or link-layer multicast address. 3198 * 3199 * Return 0 if the reference count was decremented. 3200 * Return 1 if the final reference was released, indicating that the 3201 * hardware hash filter should be reprogrammed. 3202 */ 3203static int 3204if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3205{ 3206 struct ifmultiaddr *ll_ifma; 3207 3208 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3209 KASSERT(ifma->ifma_ifp == ifp, 3210 ("%s: inconsistent ifp %p", __func__, ifp)); 3211 IF_ADDR_WLOCK_ASSERT(ifp); 3212 } 3213 3214 ifp = ifma->ifma_ifp; 3215 3216 /* 3217 * If the ifnet is detaching, null out references to ifnet, 3218 * so that upper protocol layers will notice, and not attempt 3219 * to obtain locks for an ifnet which no longer exists. The 3220 * routing socket announcement must happen before the ifnet 3221 * instance is detached from the system. 3222 */ 3223 if (detaching) { 3224#ifdef DIAGNOSTIC 3225 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3226#endif 3227 /* 3228 * ifp may already be nulled out if we are being reentered 3229 * to delete the ll_ifma. 3230 */ 3231 if (ifp != NULL) { 3232 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3233 ifma->ifma_ifp = NULL; 3234 } 3235 } 3236 3237 if (--ifma->ifma_refcount > 0) 3238 return 0; 3239 3240 /* 3241 * If this ifma is a network-layer ifma, a link-layer ifma may 3242 * have been associated with it. Release it first if so. 3243 */ 3244 ll_ifma = ifma->ifma_llifma; 3245 if (ll_ifma != NULL) { 3246 KASSERT(ifma->ifma_lladdr != NULL, 3247 ("%s: llifma w/o lladdr", __func__)); 3248 if (detaching) 3249 ll_ifma->ifma_ifp = NULL; /* XXX */ 3250 if (--ll_ifma->ifma_refcount == 0) { 3251 if (ifp != NULL) { 3252 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3253 ifma_link); 3254 } 3255 if_freemulti(ll_ifma); 3256 } 3257 } 3258 3259 if (ifp != NULL) 3260 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3261 3262 if_freemulti(ifma); 3263 3264 /* 3265 * The last reference to this instance of struct ifmultiaddr 3266 * was released; the hardware should be notified of this change. 3267 */ 3268 return 1; 3269} 3270 3271/* 3272 * Set the link layer address on an interface. 3273 * 3274 * At this time we only support certain types of interfaces, 3275 * and we don't allow the length of the address to change. 3276 */ 3277int 3278if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3279{ 3280 struct sockaddr_dl *sdl; 3281 struct ifaddr *ifa; 3282 struct ifreq ifr; 3283 3284 IF_ADDR_RLOCK(ifp); 3285 ifa = ifp->if_addr; 3286 if (ifa == NULL) { 3287 IF_ADDR_RUNLOCK(ifp); 3288 return (EINVAL); 3289 } 3290 ifa_ref(ifa); 3291 IF_ADDR_RUNLOCK(ifp); 3292 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3293 if (sdl == NULL) { 3294 ifa_free(ifa); 3295 return (EINVAL); 3296 } 3297 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3298 ifa_free(ifa); 3299 return (EINVAL); 3300 } 3301 switch (ifp->if_type) { 3302 case IFT_ETHER: 3303 case IFT_FDDI: 3304 case IFT_XETHER: 3305 case IFT_ISO88025: 3306 case IFT_L2VLAN: 3307 case IFT_BRIDGE: 3308 case IFT_ARCNET: 3309 case IFT_IEEE8023ADLAG: 3310 case IFT_IEEE80211: 3311 bcopy(lladdr, LLADDR(sdl), len); 3312 ifa_free(ifa); 3313 break; 3314 default: 3315 ifa_free(ifa); 3316 return (ENODEV); 3317 } 3318 3319 /* 3320 * If the interface is already up, we need 3321 * to re-init it in order to reprogram its 3322 * address filter. 3323 */ 3324 if ((ifp->if_flags & IFF_UP) != 0) { 3325 if (ifp->if_ioctl) { 3326 ifp->if_flags &= ~IFF_UP; 3327 ifr.ifr_flags = ifp->if_flags & 0xffff; 3328 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3329 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3330 ifp->if_flags |= IFF_UP; 3331 ifr.ifr_flags = ifp->if_flags & 0xffff; 3332 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3333 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3334 } 3335#ifdef INET 3336 /* 3337 * Also send gratuitous ARPs to notify other nodes about 3338 * the address change. 3339 */ 3340 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3341 if (ifa->ifa_addr->sa_family == AF_INET) 3342 arp_ifinit(ifp, ifa); 3343 } 3344#endif 3345 } 3346 return (0); 3347} 3348 3349/* 3350 * The name argument must be a pointer to storage which will last as 3351 * long as the interface does. For physical devices, the result of 3352 * device_get_name(dev) is a good choice and for pseudo-devices a 3353 * static string works well. 3354 */ 3355void 3356if_initname(struct ifnet *ifp, const char *name, int unit) 3357{ 3358 ifp->if_dname = name; 3359 ifp->if_dunit = unit; 3360 if (unit != IF_DUNIT_NONE) 3361 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3362 else 3363 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3364} 3365 3366int 3367if_printf(struct ifnet *ifp, const char * fmt, ...) 3368{ 3369 va_list ap; 3370 int retval; 3371 3372 retval = printf("%s: ", ifp->if_xname); 3373 va_start(ap, fmt); 3374 retval += vprintf(fmt, ap); 3375 va_end(ap); 3376 return (retval); 3377} 3378 3379void 3380if_start(struct ifnet *ifp) 3381{ 3382 3383 (*(ifp)->if_start)(ifp); 3384} 3385 3386/* 3387 * Backwards compatibility interface for drivers 3388 * that have not implemented it 3389 */ 3390static int 3391if_transmit(struct ifnet *ifp, struct mbuf *m) 3392{ 3393 int error; 3394 3395 IFQ_HANDOFF(ifp, m, error); 3396 return (error); 3397} 3398 3399int 3400if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3401{ 3402 int active = 0; 3403 3404 IF_LOCK(ifq); 3405 if (_IF_QFULL(ifq)) { 3406 _IF_DROP(ifq); 3407 IF_UNLOCK(ifq); 3408 m_freem(m); 3409 return (0); 3410 } 3411 if (ifp != NULL) { 3412 ifp->if_obytes += m->m_pkthdr.len + adjust; 3413 if (m->m_flags & (M_BCAST|M_MCAST)) 3414 ifp->if_omcasts++; 3415 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3416 } 3417 _IF_ENQUEUE(ifq, m); 3418 IF_UNLOCK(ifq); 3419 if (ifp != NULL && !active) 3420 (*(ifp)->if_start)(ifp); 3421 return (1); 3422} 3423 3424void 3425if_register_com_alloc(u_char type, 3426 if_com_alloc_t *a, if_com_free_t *f) 3427{ 3428 3429 KASSERT(if_com_alloc[type] == NULL, 3430 ("if_register_com_alloc: %d already registered", type)); 3431 KASSERT(if_com_free[type] == NULL, 3432 ("if_register_com_alloc: %d free already registered", type)); 3433 3434 if_com_alloc[type] = a; 3435 if_com_free[type] = f; 3436} 3437 3438void 3439if_deregister_com_alloc(u_char type) 3440{ 3441 3442 KASSERT(if_com_alloc[type] != NULL, 3443 ("if_deregister_com_alloc: %d not registered", type)); 3444 KASSERT(if_com_free[type] != NULL, 3445 ("if_deregister_com_alloc: %d free not registered", type)); 3446 if_com_alloc[type] = NULL; 3447 if_com_free[type] = NULL; 3448} 3449