if.c revision 233200
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: stable/9/sys/net/if.c 233200 2012-03-19 20:49:16Z jhb $ 31 */ 32 33#include "opt_compat.h" 34#include "opt_inet6.h" 35#include "opt_inet.h" 36 37#include <sys/param.h> 38#include <sys/types.h> 39#include <sys/conf.h> 40#include <sys/malloc.h> 41#include <sys/sbuf.h> 42#include <sys/bus.h> 43#include <sys/mbuf.h> 44#include <sys/systm.h> 45#include <sys/priv.h> 46#include <sys/proc.h> 47#include <sys/socket.h> 48#include <sys/socketvar.h> 49#include <sys/protosw.h> 50#include <sys/kernel.h> 51#include <sys/lock.h> 52#include <sys/refcount.h> 53#include <sys/module.h> 54#include <sys/rwlock.h> 55#include <sys/sockio.h> 56#include <sys/syslog.h> 57#include <sys/sysctl.h> 58#include <sys/taskqueue.h> 59#include <sys/domain.h> 60#include <sys/jail.h> 61#include <sys/priv.h> 62 63#include <machine/stdarg.h> 64#include <vm/uma.h> 65 66#include <net/if.h> 67#include <net/if_arp.h> 68#include <net/if_clone.h> 69#include <net/if_dl.h> 70#include <net/if_types.h> 71#include <net/if_var.h> 72#include <net/radix.h> 73#include <net/route.h> 74#include <net/vnet.h> 75 76#if defined(INET) || defined(INET6) 77/*XXX*/ 78#include <netinet/in.h> 79#include <netinet/in_var.h> 80#include <netinet/ip_carp.h> 81#ifdef INET6 82#include <netinet6/in6_var.h> 83#include <netinet6/in6_ifattach.h> 84#endif 85#endif 86#ifdef INET 87#include <netinet/if_ether.h> 88#endif 89 90#include <security/mac/mac_framework.h> 91 92#ifdef COMPAT_FREEBSD32 93#include <sys/mount.h> 94#include <compat/freebsd32/freebsd32.h> 95#endif 96 97struct ifindex_entry { 98 struct ifnet *ife_ifnet; 99}; 100 101SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 102SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 103 104TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen); 105SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 106 &ifqmaxlen, 0, "max send queue size"); 107 108/* Log link state change events */ 109static int log_link_state_change = 1; 110 111SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 112 &log_link_state_change, 0, 113 "log interface link state change events"); 114 115/* Interface description */ 116static unsigned int ifdescr_maxlen = 1024; 117SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 118 &ifdescr_maxlen, 0, 119 "administrative maximum length for interface description"); 120 121MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 122 123/* global sx for non-critical path ifdescr */ 124static struct sx ifdescr_sx; 125SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 126 127void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 128void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 129void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 130/* These are external hooks for CARP. */ 131void (*carp_linkstate_p)(struct ifnet *ifp); 132#if defined(INET) || defined(INET6) 133struct ifnet *(*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 134int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 135 struct sockaddr *sa, struct rtentry *rt); 136#endif 137#ifdef INET 138int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *, struct in_addr *, 139 u_int8_t **); 140#endif 141#ifdef INET6 142struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 143caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 144 const struct in6_addr *taddr); 145#endif 146 147struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 148 149/* 150 * XXX: Style; these should be sorted alphabetically, and unprototyped 151 * static functions should be prototyped. Currently they are sorted by 152 * declaration order. 153 */ 154static void if_attachdomain(void *); 155static void if_attachdomain1(struct ifnet *); 156static int ifconf(u_long, caddr_t); 157static void if_freemulti(struct ifmultiaddr *); 158static void if_init(void *); 159static void if_grow(void); 160static void if_route(struct ifnet *, int flag, int fam); 161static int if_setflag(struct ifnet *, int, int, int *, int); 162static int if_transmit(struct ifnet *ifp, struct mbuf *m); 163static void if_unroute(struct ifnet *, int flag, int fam); 164static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 165static int if_rtdel(struct radix_node *, void *); 166static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 167static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 168static void do_link_state_change(void *, int); 169static int if_getgroup(struct ifgroupreq *, struct ifnet *); 170static int if_getgroupmembers(struct ifgroupreq *); 171static void if_delgroups(struct ifnet *); 172static void if_attach_internal(struct ifnet *, int); 173static void if_detach_internal(struct ifnet *, int); 174 175#ifdef INET6 176/* 177 * XXX: declare here to avoid to include many inet6 related files.. 178 * should be more generalized? 179 */ 180extern void nd6_setmtu(struct ifnet *); 181#endif 182 183VNET_DEFINE(int, if_index); 184int ifqmaxlen = IFQ_MAXLEN; 185VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 186VNET_DEFINE(struct ifgrouphead, ifg_head); 187 188static VNET_DEFINE(int, if_indexlim) = 8; 189 190/* Table of ifnet by index. */ 191VNET_DEFINE(struct ifindex_entry *, ifindex_table); 192 193#define V_if_indexlim VNET(if_indexlim) 194#define V_ifindex_table VNET(ifindex_table) 195 196/* 197 * The global network interface list (V_ifnet) and related state (such as 198 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 199 * an rwlock. Either may be acquired shared to stablize the list, but both 200 * must be acquired writable to modify the list. This model allows us to 201 * both stablize the interface list during interrupt thread processing, but 202 * also to stablize it over long-running ioctls, without introducing priority 203 * inversions and deadlocks. 204 */ 205struct rwlock ifnet_rwlock; 206struct sx ifnet_sxlock; 207 208/* 209 * The allocation of network interfaces is a rather non-atomic affair; we 210 * need to select an index before we are ready to expose the interface for 211 * use, so will use this pointer value to indicate reservation. 212 */ 213#define IFNET_HOLD (void *)(uintptr_t)(-1) 214 215static if_com_alloc_t *if_com_alloc[256]; 216static if_com_free_t *if_com_free[256]; 217 218MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 219MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 220MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 221 222struct ifnet * 223ifnet_byindex_locked(u_short idx) 224{ 225 226 if (idx > V_if_index) 227 return (NULL); 228 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 229 return (NULL); 230 return (V_ifindex_table[idx].ife_ifnet); 231} 232 233struct ifnet * 234ifnet_byindex(u_short idx) 235{ 236 struct ifnet *ifp; 237 238 IFNET_RLOCK_NOSLEEP(); 239 ifp = ifnet_byindex_locked(idx); 240 IFNET_RUNLOCK_NOSLEEP(); 241 return (ifp); 242} 243 244struct ifnet * 245ifnet_byindex_ref(u_short idx) 246{ 247 struct ifnet *ifp; 248 249 IFNET_RLOCK_NOSLEEP(); 250 ifp = ifnet_byindex_locked(idx); 251 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 252 IFNET_RUNLOCK_NOSLEEP(); 253 return (NULL); 254 } 255 if_ref(ifp); 256 IFNET_RUNLOCK_NOSLEEP(); 257 return (ifp); 258} 259 260/* 261 * Allocate an ifindex array entry; return 0 on success or an error on 262 * failure. 263 */ 264static int 265ifindex_alloc_locked(u_short *idxp) 266{ 267 u_short idx; 268 269 IFNET_WLOCK_ASSERT(); 270 271retry: 272 /* 273 * Try to find an empty slot below V_if_index. If we fail, take the 274 * next slot. 275 */ 276 for (idx = 1; idx <= V_if_index; idx++) { 277 if (V_ifindex_table[idx].ife_ifnet == NULL) 278 break; 279 } 280 281 /* Catch if_index overflow. */ 282 if (idx < 1) 283 return (ENOSPC); 284 if (idx >= V_if_indexlim) { 285 if_grow(); 286 goto retry; 287 } 288 if (idx > V_if_index) 289 V_if_index = idx; 290 *idxp = idx; 291 return (0); 292} 293 294static void 295ifindex_free_locked(u_short idx) 296{ 297 298 IFNET_WLOCK_ASSERT(); 299 300 V_ifindex_table[idx].ife_ifnet = NULL; 301 while (V_if_index > 0 && 302 V_ifindex_table[V_if_index].ife_ifnet == NULL) 303 V_if_index--; 304} 305 306static void 307ifindex_free(u_short idx) 308{ 309 310 IFNET_WLOCK(); 311 ifindex_free_locked(idx); 312 IFNET_WUNLOCK(); 313} 314 315static void 316ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 317{ 318 319 IFNET_WLOCK_ASSERT(); 320 321 V_ifindex_table[idx].ife_ifnet = ifp; 322} 323 324static void 325ifnet_setbyindex(u_short idx, struct ifnet *ifp) 326{ 327 328 IFNET_WLOCK(); 329 ifnet_setbyindex_locked(idx, ifp); 330 IFNET_WUNLOCK(); 331} 332 333struct ifaddr * 334ifaddr_byindex(u_short idx) 335{ 336 struct ifaddr *ifa; 337 338 IFNET_RLOCK_NOSLEEP(); 339 ifa = ifnet_byindex_locked(idx)->if_addr; 340 if (ifa != NULL) 341 ifa_ref(ifa); 342 IFNET_RUNLOCK_NOSLEEP(); 343 return (ifa); 344} 345 346/* 347 * Network interface utility routines. 348 * 349 * Routines with ifa_ifwith* names take sockaddr *'s as 350 * parameters. 351 */ 352 353static void 354vnet_if_init(const void *unused __unused) 355{ 356 357 TAILQ_INIT(&V_ifnet); 358 TAILQ_INIT(&V_ifg_head); 359 IFNET_WLOCK(); 360 if_grow(); /* create initial table */ 361 IFNET_WUNLOCK(); 362 vnet_if_clone_init(); 363} 364VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 365 NULL); 366 367/* ARGSUSED*/ 368static void 369if_init(void *dummy __unused) 370{ 371 372 IFNET_LOCK_INIT(); 373 if_clone_init(); 374} 375SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 376 377 378#ifdef VIMAGE 379static void 380vnet_if_uninit(const void *unused __unused) 381{ 382 383 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 384 "not empty", __func__, __LINE__, &V_ifnet)); 385 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 386 "not empty", __func__, __LINE__, &V_ifg_head)); 387 388 free((caddr_t)V_ifindex_table, M_IFNET); 389} 390VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 391 vnet_if_uninit, NULL); 392#endif 393 394static void 395if_grow(void) 396{ 397 int oldlim; 398 u_int n; 399 struct ifindex_entry *e; 400 401 IFNET_WLOCK_ASSERT(); 402 oldlim = V_if_indexlim; 403 IFNET_WUNLOCK(); 404 n = (oldlim << 1) * sizeof(*e); 405 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 406 IFNET_WLOCK(); 407 if (V_if_indexlim != oldlim) { 408 free(e, M_IFNET); 409 return; 410 } 411 if (V_ifindex_table != NULL) { 412 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 413 free((caddr_t)V_ifindex_table, M_IFNET); 414 } 415 V_if_indexlim <<= 1; 416 V_ifindex_table = e; 417} 418 419/* 420 * Allocate a struct ifnet and an index for an interface. A layer 2 421 * common structure will also be allocated if an allocation routine is 422 * registered for the passed type. 423 */ 424struct ifnet * 425if_alloc(u_char type) 426{ 427 struct ifnet *ifp; 428 u_short idx; 429 430 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 431 IFNET_WLOCK(); 432 if (ifindex_alloc_locked(&idx) != 0) { 433 IFNET_WUNLOCK(); 434 free(ifp, M_IFNET); 435 return (NULL); 436 } 437 ifnet_setbyindex_locked(idx, IFNET_HOLD); 438 IFNET_WUNLOCK(); 439 ifp->if_index = idx; 440 ifp->if_type = type; 441 ifp->if_alloctype = type; 442 if (if_com_alloc[type] != NULL) { 443 ifp->if_l2com = if_com_alloc[type](type, ifp); 444 if (ifp->if_l2com == NULL) { 445 free(ifp, M_IFNET); 446 ifindex_free(idx); 447 return (NULL); 448 } 449 } 450 451 IF_ADDR_LOCK_INIT(ifp); 452 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 453 ifp->if_afdata_initialized = 0; 454 IF_AFDATA_LOCK_INIT(ifp); 455 TAILQ_INIT(&ifp->if_addrhead); 456 TAILQ_INIT(&ifp->if_prefixhead); 457 TAILQ_INIT(&ifp->if_multiaddrs); 458 TAILQ_INIT(&ifp->if_groups); 459#ifdef MAC 460 mac_ifnet_init(ifp); 461#endif 462 ifq_init(&ifp->if_snd, ifp); 463 464 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 465 ifnet_setbyindex(ifp->if_index, ifp); 466 return (ifp); 467} 468 469/* 470 * Do the actual work of freeing a struct ifnet, and layer 2 common 471 * structure. This call is made when the last reference to an 472 * interface is released. 473 */ 474static void 475if_free_internal(struct ifnet *ifp) 476{ 477 478 KASSERT((ifp->if_flags & IFF_DYING), 479 ("if_free_internal: interface not dying")); 480 481 if (if_com_free[ifp->if_alloctype] != NULL) 482 if_com_free[ifp->if_alloctype](ifp->if_l2com, 483 ifp->if_alloctype); 484 485#ifdef MAC 486 mac_ifnet_destroy(ifp); 487#endif /* MAC */ 488 if (ifp->if_description != NULL) 489 free(ifp->if_description, M_IFDESCR); 490 IF_AFDATA_DESTROY(ifp); 491 IF_ADDR_LOCK_DESTROY(ifp); 492 ifq_delete(&ifp->if_snd); 493 free(ifp, M_IFNET); 494} 495 496/* 497 * This version should only be called by intefaces that switch their type 498 * after calling if_alloc(). if_free_type() will go away again now that we 499 * have if_alloctype to cache the original allocation type. For now, assert 500 * that they match, since we require that in practice. 501 */ 502void 503if_free_type(struct ifnet *ifp, u_char type) 504{ 505 506 KASSERT(ifp->if_alloctype == type, 507 ("if_free_type: type (%d) != alloctype (%d)", type, 508 ifp->if_alloctype)); 509 510 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 511 512 IFNET_WLOCK(); 513 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 514 ("%s: freeing unallocated ifnet", ifp->if_xname)); 515 516 ifindex_free_locked(ifp->if_index); 517 IFNET_WUNLOCK(); 518 519 if (!refcount_release(&ifp->if_refcount)) 520 return; 521 if_free_internal(ifp); 522} 523 524/* 525 * This is the normal version of if_free(), used by device drivers to free a 526 * detached network interface. The contents of if_free_type() will move into 527 * here when if_free_type() goes away. 528 */ 529void 530if_free(struct ifnet *ifp) 531{ 532 533 if_free_type(ifp, ifp->if_alloctype); 534} 535 536/* 537 * Interfaces to keep an ifnet type-stable despite the possibility of the 538 * driver calling if_free(). If there are additional references, we defer 539 * freeing the underlying data structure. 540 */ 541void 542if_ref(struct ifnet *ifp) 543{ 544 545 /* We don't assert the ifnet list lock here, but arguably should. */ 546 refcount_acquire(&ifp->if_refcount); 547} 548 549void 550if_rele(struct ifnet *ifp) 551{ 552 553 if (!refcount_release(&ifp->if_refcount)) 554 return; 555 if_free_internal(ifp); 556} 557 558void 559ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 560{ 561 562 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 563 564 if (ifq->ifq_maxlen == 0) 565 ifq->ifq_maxlen = ifqmaxlen; 566 567 ifq->altq_type = 0; 568 ifq->altq_disc = NULL; 569 ifq->altq_flags &= ALTQF_CANTCHANGE; 570 ifq->altq_tbr = NULL; 571 ifq->altq_ifp = ifp; 572} 573 574void 575ifq_delete(struct ifaltq *ifq) 576{ 577 mtx_destroy(&ifq->ifq_mtx); 578} 579 580/* 581 * Perform generic interface initalization tasks and attach the interface 582 * to the list of "active" interfaces. If vmove flag is set on entry 583 * to if_attach_internal(), perform only a limited subset of initialization 584 * tasks, given that we are moving from one vnet to another an ifnet which 585 * has already been fully initialized. 586 * 587 * XXX: 588 * - The decision to return void and thus require this function to 589 * succeed is questionable. 590 * - We should probably do more sanity checking. For instance we don't 591 * do anything to insure if_xname is unique or non-empty. 592 */ 593void 594if_attach(struct ifnet *ifp) 595{ 596 597 if_attach_internal(ifp, 0); 598} 599 600static void 601if_attach_internal(struct ifnet *ifp, int vmove) 602{ 603 unsigned socksize, ifasize; 604 int namelen, masklen; 605 struct sockaddr_dl *sdl; 606 struct ifaddr *ifa; 607 608 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 609 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 610 ifp->if_xname); 611 612#ifdef VIMAGE 613 ifp->if_vnet = curvnet; 614 if (ifp->if_home_vnet == NULL) 615 ifp->if_home_vnet = curvnet; 616#endif 617 618 if_addgroup(ifp, IFG_ALL); 619 620 getmicrotime(&ifp->if_lastchange); 621 ifp->if_data.ifi_epoch = time_uptime; 622 ifp->if_data.ifi_datalen = sizeof(struct if_data); 623 624 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 625 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 626 ("transmit and qflush must both either be set or both be NULL")); 627 if (ifp->if_transmit == NULL) { 628 ifp->if_transmit = if_transmit; 629 ifp->if_qflush = if_qflush; 630 } 631 632 if (!vmove) { 633#ifdef MAC 634 mac_ifnet_create(ifp); 635#endif 636 637 /* 638 * Create a Link Level name for this device. 639 */ 640 namelen = strlen(ifp->if_xname); 641 /* 642 * Always save enough space for any possiable name so we 643 * can do a rename in place later. 644 */ 645 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 646 socksize = masklen + ifp->if_addrlen; 647 if (socksize < sizeof(*sdl)) 648 socksize = sizeof(*sdl); 649 socksize = roundup2(socksize, sizeof(long)); 650 ifasize = sizeof(*ifa) + 2 * socksize; 651 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 652 ifa_init(ifa); 653 sdl = (struct sockaddr_dl *)(ifa + 1); 654 sdl->sdl_len = socksize; 655 sdl->sdl_family = AF_LINK; 656 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 657 sdl->sdl_nlen = namelen; 658 sdl->sdl_index = ifp->if_index; 659 sdl->sdl_type = ifp->if_type; 660 ifp->if_addr = ifa; 661 ifa->ifa_ifp = ifp; 662 ifa->ifa_rtrequest = link_rtrequest; 663 ifa->ifa_addr = (struct sockaddr *)sdl; 664 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 665 ifa->ifa_netmask = (struct sockaddr *)sdl; 666 sdl->sdl_len = masklen; 667 while (namelen != 0) 668 sdl->sdl_data[--namelen] = 0xff; 669 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 670 /* Reliably crash if used uninitialized. */ 671 ifp->if_broadcastaddr = NULL; 672 } 673#ifdef VIMAGE 674 else { 675 /* 676 * Update the interface index in the link layer address 677 * of the interface. 678 */ 679 for (ifa = ifp->if_addr; ifa != NULL; 680 ifa = TAILQ_NEXT(ifa, ifa_link)) { 681 if (ifa->ifa_addr->sa_family == AF_LINK) { 682 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 683 sdl->sdl_index = ifp->if_index; 684 } 685 } 686 } 687#endif 688 689 IFNET_WLOCK(); 690 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 691#ifdef VIMAGE 692 curvnet->vnet_ifcnt++; 693#endif 694 IFNET_WUNLOCK(); 695 696 if (domain_init_status >= 2) 697 if_attachdomain1(ifp); 698 699 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 700 if (IS_DEFAULT_VNET(curvnet)) 701 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 702 703 /* Announce the interface. */ 704 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 705} 706 707static void 708if_attachdomain(void *dummy) 709{ 710 struct ifnet *ifp; 711 int s; 712 713 s = splnet(); 714 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 715 if_attachdomain1(ifp); 716 splx(s); 717} 718SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 719 if_attachdomain, NULL); 720 721static void 722if_attachdomain1(struct ifnet *ifp) 723{ 724 struct domain *dp; 725 int s; 726 727 s = splnet(); 728 729 /* 730 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 731 * cannot lock ifp->if_afdata initialization, entirely. 732 */ 733 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 734 splx(s); 735 return; 736 } 737 if (ifp->if_afdata_initialized >= domain_init_status) { 738 IF_AFDATA_UNLOCK(ifp); 739 splx(s); 740 printf("if_attachdomain called more than once on %s\n", 741 ifp->if_xname); 742 return; 743 } 744 ifp->if_afdata_initialized = domain_init_status; 745 IF_AFDATA_UNLOCK(ifp); 746 747 /* address family dependent data region */ 748 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 749 for (dp = domains; dp; dp = dp->dom_next) { 750 if (dp->dom_ifattach) 751 ifp->if_afdata[dp->dom_family] = 752 (*dp->dom_ifattach)(ifp); 753 } 754 755 splx(s); 756} 757 758/* 759 * Remove any unicast or broadcast network addresses from an interface. 760 */ 761void 762if_purgeaddrs(struct ifnet *ifp) 763{ 764 struct ifaddr *ifa, *next; 765 766 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 767 if (ifa->ifa_addr->sa_family == AF_LINK) 768 continue; 769#ifdef INET 770 /* XXX: Ugly!! ad hoc just for INET */ 771 if (ifa->ifa_addr->sa_family == AF_INET) { 772 struct ifaliasreq ifr; 773 774 bzero(&ifr, sizeof(ifr)); 775 ifr.ifra_addr = *ifa->ifa_addr; 776 if (ifa->ifa_dstaddr) 777 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 778 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 779 NULL) == 0) 780 continue; 781 } 782#endif /* INET */ 783#ifdef INET6 784 if (ifa->ifa_addr->sa_family == AF_INET6) { 785 in6_purgeaddr(ifa); 786 /* ifp_addrhead is already updated */ 787 continue; 788 } 789#endif /* INET6 */ 790 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 791 ifa_free(ifa); 792 } 793} 794 795/* 796 * Remove any multicast network addresses from an interface when an ifnet 797 * is going away. 798 */ 799static void 800if_purgemaddrs(struct ifnet *ifp) 801{ 802 struct ifmultiaddr *ifma; 803 struct ifmultiaddr *next; 804 805 IF_ADDR_WLOCK(ifp); 806 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 807 if_delmulti_locked(ifp, ifma, 1); 808 IF_ADDR_WUNLOCK(ifp); 809} 810 811/* 812 * Detach an interface, removing it from the list of "active" interfaces. 813 * If vmove flag is set on entry to if_detach_internal(), perform only a 814 * limited subset of cleanup tasks, given that we are moving an ifnet from 815 * one vnet to another, where it must be fully operational. 816 * 817 * XXXRW: There are some significant questions about event ordering, and 818 * how to prevent things from starting to use the interface during detach. 819 */ 820void 821if_detach(struct ifnet *ifp) 822{ 823 824 if_detach_internal(ifp, 0); 825} 826 827static void 828if_detach_internal(struct ifnet *ifp, int vmove) 829{ 830 struct ifaddr *ifa; 831 struct radix_node_head *rnh; 832 int i, j; 833 struct domain *dp; 834 struct ifnet *iter; 835 int found = 0; 836 837 IFNET_WLOCK(); 838 TAILQ_FOREACH(iter, &V_ifnet, if_link) 839 if (iter == ifp) { 840 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 841 found = 1; 842 break; 843 } 844#ifdef VIMAGE 845 if (found) 846 curvnet->vnet_ifcnt--; 847#endif 848 IFNET_WUNLOCK(); 849 if (!found) { 850 if (vmove) 851 panic("%s: ifp=%p not on the ifnet tailq %p", 852 __func__, ifp, &V_ifnet); 853 else 854 return; /* XXX this should panic as well? */ 855 } 856 857 /* 858 * Remove/wait for pending events. 859 */ 860 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 861 862 /* 863 * Remove routes and flush queues. 864 */ 865 if_down(ifp); 866#ifdef ALTQ 867 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 868 altq_disable(&ifp->if_snd); 869 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 870 altq_detach(&ifp->if_snd); 871#endif 872 873 if_purgeaddrs(ifp); 874 875#ifdef INET 876 in_ifdetach(ifp); 877#endif 878 879#ifdef INET6 880 /* 881 * Remove all IPv6 kernel structs related to ifp. This should be done 882 * before removing routing entries below, since IPv6 interface direct 883 * routes are expected to be removed by the IPv6-specific kernel API. 884 * Otherwise, the kernel will detect some inconsistency and bark it. 885 */ 886 in6_ifdetach(ifp); 887#endif 888 if_purgemaddrs(ifp); 889 890 if (!vmove) { 891 /* 892 * Prevent further calls into the device driver via ifnet. 893 */ 894 if_dead(ifp); 895 896 /* 897 * Remove link ifaddr pointer and maybe decrement if_index. 898 * Clean up all addresses. 899 */ 900 ifp->if_addr = NULL; 901 902 /* We can now free link ifaddr. */ 903 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 904 ifa = TAILQ_FIRST(&ifp->if_addrhead); 905 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 906 ifa_free(ifa); 907 } 908 } 909 910 /* 911 * Delete all remaining routes using this interface 912 * Unfortuneatly the only way to do this is to slog through 913 * the entire routing table looking for routes which point 914 * to this interface...oh well... 915 */ 916 for (i = 1; i <= AF_MAX; i++) { 917 for (j = 0; j < rt_numfibs; j++) { 918 rnh = rt_tables_get_rnh(j, i); 919 if (rnh == NULL) 920 continue; 921 RADIX_NODE_HEAD_LOCK(rnh); 922 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 923 RADIX_NODE_HEAD_UNLOCK(rnh); 924 } 925 } 926 927 /* Announce that the interface is gone. */ 928 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 929 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 930 if (IS_DEFAULT_VNET(curvnet)) 931 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 932 if_delgroups(ifp); 933 934 /* 935 * We cannot hold the lock over dom_ifdetach calls as they might 936 * sleep, for example trying to drain a callout, thus open up the 937 * theoretical race with re-attaching. 938 */ 939 IF_AFDATA_LOCK(ifp); 940 i = ifp->if_afdata_initialized; 941 ifp->if_afdata_initialized = 0; 942 IF_AFDATA_UNLOCK(ifp); 943 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 944 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 945 (*dp->dom_ifdetach)(ifp, 946 ifp->if_afdata[dp->dom_family]); 947 } 948} 949 950#ifdef VIMAGE 951/* 952 * if_vmove() performs a limited version of if_detach() in current 953 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 954 * An attempt is made to shrink if_index in current vnet, find an 955 * unused if_index in target vnet and calls if_grow() if necessary, 956 * and finally find an unused if_xname for the target vnet. 957 */ 958void 959if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 960{ 961 u_short idx; 962 963 /* 964 * Detach from current vnet, but preserve LLADDR info, do not 965 * mark as dead etc. so that the ifnet can be reattached later. 966 */ 967 if_detach_internal(ifp, 1); 968 969 /* 970 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 971 * the if_index for that vnet if possible. 972 * 973 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 974 * or we'd lock on one vnet and unlock on another. 975 */ 976 IFNET_WLOCK(); 977 ifindex_free_locked(ifp->if_index); 978 IFNET_WUNLOCK(); 979 980 /* 981 * Perform interface-specific reassignment tasks, if provided by 982 * the driver. 983 */ 984 if (ifp->if_reassign != NULL) 985 ifp->if_reassign(ifp, new_vnet, NULL); 986 987 /* 988 * Switch to the context of the target vnet. 989 */ 990 CURVNET_SET_QUIET(new_vnet); 991 992 IFNET_WLOCK(); 993 if (ifindex_alloc_locked(&idx) != 0) { 994 IFNET_WUNLOCK(); 995 panic("if_index overflow"); 996 } 997 ifp->if_index = idx; 998 ifnet_setbyindex_locked(ifp->if_index, ifp); 999 IFNET_WUNLOCK(); 1000 1001 if_attach_internal(ifp, 1); 1002 1003 CURVNET_RESTORE(); 1004} 1005 1006/* 1007 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1008 */ 1009static int 1010if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1011{ 1012 struct prison *pr; 1013 struct ifnet *difp; 1014 1015 /* Try to find the prison within our visibility. */ 1016 sx_slock(&allprison_lock); 1017 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1018 sx_sunlock(&allprison_lock); 1019 if (pr == NULL) 1020 return (ENXIO); 1021 prison_hold_locked(pr); 1022 mtx_unlock(&pr->pr_mtx); 1023 1024 /* Do not try to move the iface from and to the same prison. */ 1025 if (pr->pr_vnet == ifp->if_vnet) { 1026 prison_free(pr); 1027 return (EEXIST); 1028 } 1029 1030 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1031 /* XXX Lock interfaces to avoid races. */ 1032 CURVNET_SET_QUIET(pr->pr_vnet); 1033 difp = ifunit(ifname); 1034 CURVNET_RESTORE(); 1035 if (difp != NULL) { 1036 prison_free(pr); 1037 return (EEXIST); 1038 } 1039 1040 /* Move the interface into the child jail/vnet. */ 1041 if_vmove(ifp, pr->pr_vnet); 1042 1043 /* Report the new if_xname back to the userland. */ 1044 sprintf(ifname, "%s", ifp->if_xname); 1045 1046 prison_free(pr); 1047 return (0); 1048} 1049 1050static int 1051if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1052{ 1053 struct prison *pr; 1054 struct vnet *vnet_dst; 1055 struct ifnet *ifp; 1056 1057 /* Try to find the prison within our visibility. */ 1058 sx_slock(&allprison_lock); 1059 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1060 sx_sunlock(&allprison_lock); 1061 if (pr == NULL) 1062 return (ENXIO); 1063 prison_hold_locked(pr); 1064 mtx_unlock(&pr->pr_mtx); 1065 1066 /* Make sure the named iface exists in the source prison/vnet. */ 1067 CURVNET_SET(pr->pr_vnet); 1068 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1069 if (ifp == NULL) { 1070 CURVNET_RESTORE(); 1071 prison_free(pr); 1072 return (ENXIO); 1073 } 1074 1075 /* Do not try to move the iface from and to the same prison. */ 1076 vnet_dst = TD_TO_VNET(td); 1077 if (vnet_dst == ifp->if_vnet) { 1078 CURVNET_RESTORE(); 1079 prison_free(pr); 1080 return (EEXIST); 1081 } 1082 1083 /* Get interface back from child jail/vnet. */ 1084 if_vmove(ifp, vnet_dst); 1085 CURVNET_RESTORE(); 1086 1087 /* Report the new if_xname back to the userland. */ 1088 sprintf(ifname, "%s", ifp->if_xname); 1089 1090 prison_free(pr); 1091 return (0); 1092} 1093#endif /* VIMAGE */ 1094 1095/* 1096 * Add a group to an interface 1097 */ 1098int 1099if_addgroup(struct ifnet *ifp, const char *groupname) 1100{ 1101 struct ifg_list *ifgl; 1102 struct ifg_group *ifg = NULL; 1103 struct ifg_member *ifgm; 1104 1105 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1106 groupname[strlen(groupname) - 1] <= '9') 1107 return (EINVAL); 1108 1109 IFNET_WLOCK(); 1110 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1111 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1112 IFNET_WUNLOCK(); 1113 return (EEXIST); 1114 } 1115 1116 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1117 M_NOWAIT)) == NULL) { 1118 IFNET_WUNLOCK(); 1119 return (ENOMEM); 1120 } 1121 1122 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1123 M_TEMP, M_NOWAIT)) == NULL) { 1124 free(ifgl, M_TEMP); 1125 IFNET_WUNLOCK(); 1126 return (ENOMEM); 1127 } 1128 1129 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1130 if (!strcmp(ifg->ifg_group, groupname)) 1131 break; 1132 1133 if (ifg == NULL) { 1134 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1135 M_TEMP, M_NOWAIT)) == NULL) { 1136 free(ifgl, M_TEMP); 1137 free(ifgm, M_TEMP); 1138 IFNET_WUNLOCK(); 1139 return (ENOMEM); 1140 } 1141 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1142 ifg->ifg_refcnt = 0; 1143 TAILQ_INIT(&ifg->ifg_members); 1144 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1145 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1146 } 1147 1148 ifg->ifg_refcnt++; 1149 ifgl->ifgl_group = ifg; 1150 ifgm->ifgm_ifp = ifp; 1151 1152 IF_ADDR_WLOCK(ifp); 1153 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1154 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1155 IF_ADDR_WUNLOCK(ifp); 1156 1157 IFNET_WUNLOCK(); 1158 1159 EVENTHANDLER_INVOKE(group_change_event, groupname); 1160 1161 return (0); 1162} 1163 1164/* 1165 * Remove a group from an interface 1166 */ 1167int 1168if_delgroup(struct ifnet *ifp, const char *groupname) 1169{ 1170 struct ifg_list *ifgl; 1171 struct ifg_member *ifgm; 1172 1173 IFNET_WLOCK(); 1174 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1175 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1176 break; 1177 if (ifgl == NULL) { 1178 IFNET_WUNLOCK(); 1179 return (ENOENT); 1180 } 1181 1182 IF_ADDR_WLOCK(ifp); 1183 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1184 IF_ADDR_WUNLOCK(ifp); 1185 1186 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1187 if (ifgm->ifgm_ifp == ifp) 1188 break; 1189 1190 if (ifgm != NULL) { 1191 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1192 free(ifgm, M_TEMP); 1193 } 1194 1195 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1196 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1197 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1198 free(ifgl->ifgl_group, M_TEMP); 1199 } 1200 IFNET_WUNLOCK(); 1201 1202 free(ifgl, M_TEMP); 1203 1204 EVENTHANDLER_INVOKE(group_change_event, groupname); 1205 1206 return (0); 1207} 1208 1209/* 1210 * Remove an interface from all groups 1211 */ 1212static void 1213if_delgroups(struct ifnet *ifp) 1214{ 1215 struct ifg_list *ifgl; 1216 struct ifg_member *ifgm; 1217 char groupname[IFNAMSIZ]; 1218 1219 IFNET_WLOCK(); 1220 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1221 ifgl = TAILQ_FIRST(&ifp->if_groups); 1222 1223 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1224 1225 IF_ADDR_WLOCK(ifp); 1226 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1227 IF_ADDR_WUNLOCK(ifp); 1228 1229 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1230 if (ifgm->ifgm_ifp == ifp) 1231 break; 1232 1233 if (ifgm != NULL) { 1234 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1235 ifgm_next); 1236 free(ifgm, M_TEMP); 1237 } 1238 1239 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1240 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1241 EVENTHANDLER_INVOKE(group_detach_event, 1242 ifgl->ifgl_group); 1243 free(ifgl->ifgl_group, M_TEMP); 1244 } 1245 IFNET_WUNLOCK(); 1246 1247 free(ifgl, M_TEMP); 1248 1249 EVENTHANDLER_INVOKE(group_change_event, groupname); 1250 1251 IFNET_WLOCK(); 1252 } 1253 IFNET_WUNLOCK(); 1254} 1255 1256/* 1257 * Stores all groups from an interface in memory pointed 1258 * to by data 1259 */ 1260static int 1261if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1262{ 1263 int len, error; 1264 struct ifg_list *ifgl; 1265 struct ifg_req ifgrq, *ifgp; 1266 struct ifgroupreq *ifgr = data; 1267 1268 if (ifgr->ifgr_len == 0) { 1269 IF_ADDR_RLOCK(ifp); 1270 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1271 ifgr->ifgr_len += sizeof(struct ifg_req); 1272 IF_ADDR_RUNLOCK(ifp); 1273 return (0); 1274 } 1275 1276 len = ifgr->ifgr_len; 1277 ifgp = ifgr->ifgr_groups; 1278 /* XXX: wire */ 1279 IF_ADDR_RLOCK(ifp); 1280 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1281 if (len < sizeof(ifgrq)) { 1282 IF_ADDR_RUNLOCK(ifp); 1283 return (EINVAL); 1284 } 1285 bzero(&ifgrq, sizeof ifgrq); 1286 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1287 sizeof(ifgrq.ifgrq_group)); 1288 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1289 IF_ADDR_RUNLOCK(ifp); 1290 return (error); 1291 } 1292 len -= sizeof(ifgrq); 1293 ifgp++; 1294 } 1295 IF_ADDR_RUNLOCK(ifp); 1296 1297 return (0); 1298} 1299 1300/* 1301 * Stores all members of a group in memory pointed to by data 1302 */ 1303static int 1304if_getgroupmembers(struct ifgroupreq *data) 1305{ 1306 struct ifgroupreq *ifgr = data; 1307 struct ifg_group *ifg; 1308 struct ifg_member *ifgm; 1309 struct ifg_req ifgrq, *ifgp; 1310 int len, error; 1311 1312 IFNET_RLOCK(); 1313 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1314 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1315 break; 1316 if (ifg == NULL) { 1317 IFNET_RUNLOCK(); 1318 return (ENOENT); 1319 } 1320 1321 if (ifgr->ifgr_len == 0) { 1322 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1323 ifgr->ifgr_len += sizeof(ifgrq); 1324 IFNET_RUNLOCK(); 1325 return (0); 1326 } 1327 1328 len = ifgr->ifgr_len; 1329 ifgp = ifgr->ifgr_groups; 1330 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1331 if (len < sizeof(ifgrq)) { 1332 IFNET_RUNLOCK(); 1333 return (EINVAL); 1334 } 1335 bzero(&ifgrq, sizeof ifgrq); 1336 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1337 sizeof(ifgrq.ifgrq_member)); 1338 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1339 IFNET_RUNLOCK(); 1340 return (error); 1341 } 1342 len -= sizeof(ifgrq); 1343 ifgp++; 1344 } 1345 IFNET_RUNLOCK(); 1346 1347 return (0); 1348} 1349 1350/* 1351 * Delete Routes for a Network Interface 1352 * 1353 * Called for each routing entry via the rnh->rnh_walktree() call above 1354 * to delete all route entries referencing a detaching network interface. 1355 * 1356 * Arguments: 1357 * rn pointer to node in the routing table 1358 * arg argument passed to rnh->rnh_walktree() - detaching interface 1359 * 1360 * Returns: 1361 * 0 successful 1362 * errno failed - reason indicated 1363 * 1364 */ 1365static int 1366if_rtdel(struct radix_node *rn, void *arg) 1367{ 1368 struct rtentry *rt = (struct rtentry *)rn; 1369 struct ifnet *ifp = arg; 1370 int err; 1371 1372 if (rt->rt_ifp == ifp) { 1373 1374 /* 1375 * Protect (sorta) against walktree recursion problems 1376 * with cloned routes 1377 */ 1378 if ((rt->rt_flags & RTF_UP) == 0) 1379 return (0); 1380 1381 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1382 rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED, 1383 (struct rtentry **) NULL, rt->rt_fibnum); 1384 if (err) { 1385 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1386 } 1387 } 1388 1389 return (0); 1390} 1391 1392/* 1393 * Wrapper functions for struct ifnet address list locking macros. These are 1394 * used by kernel modules to avoid encoding programming interface or binary 1395 * interface assumptions that may be violated when kernel-internal locking 1396 * approaches change. 1397 */ 1398void 1399if_addr_rlock(struct ifnet *ifp) 1400{ 1401 1402 IF_ADDR_RLOCK(ifp); 1403} 1404 1405void 1406if_addr_runlock(struct ifnet *ifp) 1407{ 1408 1409 IF_ADDR_RUNLOCK(ifp); 1410} 1411 1412void 1413if_maddr_rlock(struct ifnet *ifp) 1414{ 1415 1416 IF_ADDR_RLOCK(ifp); 1417} 1418 1419void 1420if_maddr_runlock(struct ifnet *ifp) 1421{ 1422 1423 IF_ADDR_RUNLOCK(ifp); 1424} 1425 1426/* 1427 * Reference count functions for ifaddrs. 1428 */ 1429void 1430ifa_init(struct ifaddr *ifa) 1431{ 1432 1433 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1434 refcount_init(&ifa->ifa_refcnt, 1); 1435} 1436 1437void 1438ifa_ref(struct ifaddr *ifa) 1439{ 1440 1441 refcount_acquire(&ifa->ifa_refcnt); 1442} 1443 1444void 1445ifa_free(struct ifaddr *ifa) 1446{ 1447 1448 if (refcount_release(&ifa->ifa_refcnt)) { 1449 mtx_destroy(&ifa->ifa_mtx); 1450 free(ifa, M_IFADDR); 1451 } 1452} 1453 1454int 1455ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1456{ 1457 int error = 0; 1458 struct rtentry *rt = NULL; 1459 struct rt_addrinfo info; 1460 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1461 1462 bzero(&info, sizeof(info)); 1463 info.rti_ifp = V_loif; 1464 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1465 info.rti_info[RTAX_DST] = ia; 1466 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1467 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1468 1469 if (error == 0 && rt != NULL) { 1470 RT_LOCK(rt); 1471 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1472 ifa->ifa_ifp->if_type; 1473 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1474 ifa->ifa_ifp->if_index; 1475 RT_REMREF(rt); 1476 RT_UNLOCK(rt); 1477 } else if (error != 0) 1478 log(LOG_INFO, "ifa_add_loopback_route: insertion failed\n"); 1479 1480 return (error); 1481} 1482 1483int 1484ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1485{ 1486 int error = 0; 1487 struct rt_addrinfo info; 1488 struct sockaddr_dl null_sdl; 1489 1490 bzero(&null_sdl, sizeof(null_sdl)); 1491 null_sdl.sdl_len = sizeof(null_sdl); 1492 null_sdl.sdl_family = AF_LINK; 1493 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1494 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1495 bzero(&info, sizeof(info)); 1496 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1497 info.rti_info[RTAX_DST] = ia; 1498 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1499 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1500 1501 if (error != 0) 1502 log(LOG_INFO, "ifa_del_loopback_route: deletion failed\n"); 1503 1504 return (error); 1505} 1506 1507/* 1508 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1509 * structs used to represent other address families, it is necessary 1510 * to perform a different comparison. 1511 */ 1512 1513#define sa_equal(a1, a2) \ 1514 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1515 1516#define sa_dl_equal(a1, a2) \ 1517 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1518 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1519 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1520 LLADDR((struct sockaddr_dl *)(a2)), \ 1521 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1522 1523/* 1524 * Locate an interface based on a complete address. 1525 */ 1526/*ARGSUSED*/ 1527static struct ifaddr * 1528ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1529{ 1530 struct ifnet *ifp; 1531 struct ifaddr *ifa; 1532 1533 IFNET_RLOCK_NOSLEEP(); 1534 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1535 IF_ADDR_RLOCK(ifp); 1536 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1537 if (ifa->ifa_addr->sa_family != addr->sa_family) 1538 continue; 1539 if (sa_equal(addr, ifa->ifa_addr)) { 1540 if (getref) 1541 ifa_ref(ifa); 1542 IF_ADDR_RUNLOCK(ifp); 1543 goto done; 1544 } 1545 /* IP6 doesn't have broadcast */ 1546 if ((ifp->if_flags & IFF_BROADCAST) && 1547 ifa->ifa_broadaddr && 1548 ifa->ifa_broadaddr->sa_len != 0 && 1549 sa_equal(ifa->ifa_broadaddr, addr)) { 1550 if (getref) 1551 ifa_ref(ifa); 1552 IF_ADDR_RUNLOCK(ifp); 1553 goto done; 1554 } 1555 } 1556 IF_ADDR_RUNLOCK(ifp); 1557 } 1558 ifa = NULL; 1559done: 1560 IFNET_RUNLOCK_NOSLEEP(); 1561 return (ifa); 1562} 1563 1564struct ifaddr * 1565ifa_ifwithaddr(struct sockaddr *addr) 1566{ 1567 1568 return (ifa_ifwithaddr_internal(addr, 1)); 1569} 1570 1571int 1572ifa_ifwithaddr_check(struct sockaddr *addr) 1573{ 1574 1575 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1576} 1577 1578/* 1579 * Locate an interface based on the broadcast address. 1580 */ 1581/* ARGSUSED */ 1582struct ifaddr * 1583ifa_ifwithbroadaddr(struct sockaddr *addr) 1584{ 1585 struct ifnet *ifp; 1586 struct ifaddr *ifa; 1587 1588 IFNET_RLOCK_NOSLEEP(); 1589 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1590 IF_ADDR_RLOCK(ifp); 1591 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1592 if (ifa->ifa_addr->sa_family != addr->sa_family) 1593 continue; 1594 if ((ifp->if_flags & IFF_BROADCAST) && 1595 ifa->ifa_broadaddr && 1596 ifa->ifa_broadaddr->sa_len != 0 && 1597 sa_equal(ifa->ifa_broadaddr, addr)) { 1598 ifa_ref(ifa); 1599 IF_ADDR_RUNLOCK(ifp); 1600 goto done; 1601 } 1602 } 1603 IF_ADDR_RUNLOCK(ifp); 1604 } 1605 ifa = NULL; 1606done: 1607 IFNET_RUNLOCK_NOSLEEP(); 1608 return (ifa); 1609} 1610 1611/* 1612 * Locate the point to point interface with a given destination address. 1613 */ 1614/*ARGSUSED*/ 1615struct ifaddr * 1616ifa_ifwithdstaddr(struct sockaddr *addr) 1617{ 1618 struct ifnet *ifp; 1619 struct ifaddr *ifa; 1620 1621 IFNET_RLOCK_NOSLEEP(); 1622 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1623 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1624 continue; 1625 IF_ADDR_RLOCK(ifp); 1626 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1627 if (ifa->ifa_addr->sa_family != addr->sa_family) 1628 continue; 1629 if (ifa->ifa_dstaddr != NULL && 1630 sa_equal(addr, ifa->ifa_dstaddr)) { 1631 ifa_ref(ifa); 1632 IF_ADDR_RUNLOCK(ifp); 1633 goto done; 1634 } 1635 } 1636 IF_ADDR_RUNLOCK(ifp); 1637 } 1638 ifa = NULL; 1639done: 1640 IFNET_RUNLOCK_NOSLEEP(); 1641 return (ifa); 1642} 1643 1644/* 1645 * Find an interface on a specific network. If many, choice 1646 * is most specific found. 1647 */ 1648struct ifaddr * 1649ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1650{ 1651 struct ifnet *ifp; 1652 struct ifaddr *ifa; 1653 struct ifaddr *ifa_maybe = NULL; 1654 u_int af = addr->sa_family; 1655 char *addr_data = addr->sa_data, *cplim; 1656 1657 /* 1658 * AF_LINK addresses can be looked up directly by their index number, 1659 * so do that if we can. 1660 */ 1661 if (af == AF_LINK) { 1662 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1663 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1664 return (ifaddr_byindex(sdl->sdl_index)); 1665 } 1666 1667 /* 1668 * Scan though each interface, looking for ones that have addresses 1669 * in this address family. Maintain a reference on ifa_maybe once 1670 * we find one, as we release the IF_ADDR_RLOCK() that kept it stable 1671 * when we move onto the next interface. 1672 */ 1673 IFNET_RLOCK_NOSLEEP(); 1674 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1675 IF_ADDR_RLOCK(ifp); 1676 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1677 char *cp, *cp2, *cp3; 1678 1679 if (ifa->ifa_addr->sa_family != af) 1680next: continue; 1681 if (af == AF_INET && 1682 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1683 /* 1684 * This is a bit broken as it doesn't 1685 * take into account that the remote end may 1686 * be a single node in the network we are 1687 * looking for. 1688 * The trouble is that we don't know the 1689 * netmask for the remote end. 1690 */ 1691 if (ifa->ifa_dstaddr != NULL && 1692 sa_equal(addr, ifa->ifa_dstaddr)) { 1693 ifa_ref(ifa); 1694 IF_ADDR_RUNLOCK(ifp); 1695 goto done; 1696 } 1697 } else { 1698 /* 1699 * if we have a special address handler, 1700 * then use it instead of the generic one. 1701 */ 1702 if (ifa->ifa_claim_addr) { 1703 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1704 ifa_ref(ifa); 1705 IF_ADDR_RUNLOCK(ifp); 1706 goto done; 1707 } 1708 continue; 1709 } 1710 1711 /* 1712 * Scan all the bits in the ifa's address. 1713 * If a bit dissagrees with what we are 1714 * looking for, mask it with the netmask 1715 * to see if it really matters. 1716 * (A byte at a time) 1717 */ 1718 if (ifa->ifa_netmask == 0) 1719 continue; 1720 cp = addr_data; 1721 cp2 = ifa->ifa_addr->sa_data; 1722 cp3 = ifa->ifa_netmask->sa_data; 1723 cplim = ifa->ifa_netmask->sa_len 1724 + (char *)ifa->ifa_netmask; 1725 while (cp3 < cplim) 1726 if ((*cp++ ^ *cp2++) & *cp3++) 1727 goto next; /* next address! */ 1728 /* 1729 * If the netmask of what we just found 1730 * is more specific than what we had before 1731 * (if we had one) then remember the new one 1732 * before continuing to search 1733 * for an even better one. 1734 */ 1735 if (ifa_maybe == NULL || 1736 rn_refines((caddr_t)ifa->ifa_netmask, 1737 (caddr_t)ifa_maybe->ifa_netmask)) { 1738 if (ifa_maybe != NULL) 1739 ifa_free(ifa_maybe); 1740 ifa_maybe = ifa; 1741 ifa_ref(ifa_maybe); 1742 } 1743 } 1744 } 1745 IF_ADDR_RUNLOCK(ifp); 1746 } 1747 ifa = ifa_maybe; 1748 ifa_maybe = NULL; 1749done: 1750 IFNET_RUNLOCK_NOSLEEP(); 1751 if (ifa_maybe != NULL) 1752 ifa_free(ifa_maybe); 1753 return (ifa); 1754} 1755 1756/* 1757 * Find an interface address specific to an interface best matching 1758 * a given address. 1759 */ 1760struct ifaddr * 1761ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1762{ 1763 struct ifaddr *ifa; 1764 char *cp, *cp2, *cp3; 1765 char *cplim; 1766 struct ifaddr *ifa_maybe = NULL; 1767 u_int af = addr->sa_family; 1768 1769 if (af >= AF_MAX) 1770 return (NULL); 1771 IF_ADDR_RLOCK(ifp); 1772 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1773 if (ifa->ifa_addr->sa_family != af) 1774 continue; 1775 if (ifa_maybe == NULL) 1776 ifa_maybe = ifa; 1777 if (ifa->ifa_netmask == 0) { 1778 if (sa_equal(addr, ifa->ifa_addr) || 1779 (ifa->ifa_dstaddr && 1780 sa_equal(addr, ifa->ifa_dstaddr))) 1781 goto done; 1782 continue; 1783 } 1784 if (ifp->if_flags & IFF_POINTOPOINT) { 1785 if (sa_equal(addr, ifa->ifa_dstaddr)) 1786 goto done; 1787 } else { 1788 cp = addr->sa_data; 1789 cp2 = ifa->ifa_addr->sa_data; 1790 cp3 = ifa->ifa_netmask->sa_data; 1791 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1792 for (; cp3 < cplim; cp3++) 1793 if ((*cp++ ^ *cp2++) & *cp3) 1794 break; 1795 if (cp3 == cplim) 1796 goto done; 1797 } 1798 } 1799 ifa = ifa_maybe; 1800done: 1801 if (ifa != NULL) 1802 ifa_ref(ifa); 1803 IF_ADDR_RUNLOCK(ifp); 1804 return (ifa); 1805} 1806 1807#include <net/if_llatbl.h> 1808 1809/* 1810 * Default action when installing a route with a Link Level gateway. 1811 * Lookup an appropriate real ifa to point to. 1812 * This should be moved to /sys/net/link.c eventually. 1813 */ 1814static void 1815link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1816{ 1817 struct ifaddr *ifa, *oifa; 1818 struct sockaddr *dst; 1819 struct ifnet *ifp; 1820 1821 RT_LOCK_ASSERT(rt); 1822 1823 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1824 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1825 return; 1826 ifa = ifaof_ifpforaddr(dst, ifp); 1827 if (ifa) { 1828 oifa = rt->rt_ifa; 1829 rt->rt_ifa = ifa; 1830 ifa_free(oifa); 1831 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1832 ifa->ifa_rtrequest(cmd, rt, info); 1833 } 1834} 1835 1836/* 1837 * Mark an interface down and notify protocols of 1838 * the transition. 1839 * NOTE: must be called at splnet or eqivalent. 1840 */ 1841static void 1842if_unroute(struct ifnet *ifp, int flag, int fam) 1843{ 1844 struct ifaddr *ifa; 1845 1846 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1847 1848 ifp->if_flags &= ~flag; 1849 getmicrotime(&ifp->if_lastchange); 1850 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1851 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1852 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1853 ifp->if_qflush(ifp); 1854 1855 if (ifp->if_carp) 1856 (*carp_linkstate_p)(ifp); 1857 rt_ifmsg(ifp); 1858} 1859 1860/* 1861 * Mark an interface up and notify protocols of 1862 * the transition. 1863 * NOTE: must be called at splnet or eqivalent. 1864 */ 1865static void 1866if_route(struct ifnet *ifp, int flag, int fam) 1867{ 1868 struct ifaddr *ifa; 1869 1870 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1871 1872 ifp->if_flags |= flag; 1873 getmicrotime(&ifp->if_lastchange); 1874 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1875 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1876 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1877 if (ifp->if_carp) 1878 (*carp_linkstate_p)(ifp); 1879 rt_ifmsg(ifp); 1880#ifdef INET6 1881 in6_if_up(ifp); 1882#endif 1883} 1884 1885void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1886void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1887struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1888struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1889int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1890int (*vlan_setcookie_p)(struct ifnet *, void *); 1891void *(*vlan_cookie_p)(struct ifnet *); 1892 1893/* 1894 * Handle a change in the interface link state. To avoid LORs 1895 * between driver lock and upper layer locks, as well as possible 1896 * recursions, we post event to taskqueue, and all job 1897 * is done in static do_link_state_change(). 1898 */ 1899void 1900if_link_state_change(struct ifnet *ifp, int link_state) 1901{ 1902 /* Return if state hasn't changed. */ 1903 if (ifp->if_link_state == link_state) 1904 return; 1905 1906 ifp->if_link_state = link_state; 1907 1908 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1909} 1910 1911static void 1912do_link_state_change(void *arg, int pending) 1913{ 1914 struct ifnet *ifp = (struct ifnet *)arg; 1915 int link_state = ifp->if_link_state; 1916 CURVNET_SET(ifp->if_vnet); 1917 1918 /* Notify that the link state has changed. */ 1919 rt_ifmsg(ifp); 1920 if (ifp->if_vlantrunk != NULL) 1921 (*vlan_link_state_p)(ifp); 1922 1923 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1924 IFP2AC(ifp)->ac_netgraph != NULL) 1925 (*ng_ether_link_state_p)(ifp, link_state); 1926 if (ifp->if_carp) 1927 (*carp_linkstate_p)(ifp); 1928 if (ifp->if_bridge) { 1929 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1930 (*bstp_linkstate_p)(ifp, link_state); 1931 } 1932 if (ifp->if_lagg) { 1933 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1934 (*lagg_linkstate_p)(ifp, link_state); 1935 } 1936 1937 if (IS_DEFAULT_VNET(curvnet)) 1938 devctl_notify("IFNET", ifp->if_xname, 1939 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1940 NULL); 1941 if (pending > 1) 1942 if_printf(ifp, "%d link states coalesced\n", pending); 1943 if (log_link_state_change) 1944 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1945 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1946 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 1947 CURVNET_RESTORE(); 1948} 1949 1950/* 1951 * Mark an interface down and notify protocols of 1952 * the transition. 1953 * NOTE: must be called at splnet or eqivalent. 1954 */ 1955void 1956if_down(struct ifnet *ifp) 1957{ 1958 1959 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1960} 1961 1962/* 1963 * Mark an interface up and notify protocols of 1964 * the transition. 1965 * NOTE: must be called at splnet or eqivalent. 1966 */ 1967void 1968if_up(struct ifnet *ifp) 1969{ 1970 1971 if_route(ifp, IFF_UP, AF_UNSPEC); 1972} 1973 1974/* 1975 * Flush an interface queue. 1976 */ 1977void 1978if_qflush(struct ifnet *ifp) 1979{ 1980 struct mbuf *m, *n; 1981 struct ifaltq *ifq; 1982 1983 ifq = &ifp->if_snd; 1984 IFQ_LOCK(ifq); 1985#ifdef ALTQ 1986 if (ALTQ_IS_ENABLED(ifq)) 1987 ALTQ_PURGE(ifq); 1988#endif 1989 n = ifq->ifq_head; 1990 while ((m = n) != 0) { 1991 n = m->m_act; 1992 m_freem(m); 1993 } 1994 ifq->ifq_head = 0; 1995 ifq->ifq_tail = 0; 1996 ifq->ifq_len = 0; 1997 IFQ_UNLOCK(ifq); 1998} 1999 2000/* 2001 * Map interface name to interface structure pointer, with or without 2002 * returning a reference. 2003 */ 2004struct ifnet * 2005ifunit_ref(const char *name) 2006{ 2007 struct ifnet *ifp; 2008 2009 IFNET_RLOCK_NOSLEEP(); 2010 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2011 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2012 !(ifp->if_flags & IFF_DYING)) 2013 break; 2014 } 2015 if (ifp != NULL) 2016 if_ref(ifp); 2017 IFNET_RUNLOCK_NOSLEEP(); 2018 return (ifp); 2019} 2020 2021struct ifnet * 2022ifunit(const char *name) 2023{ 2024 struct ifnet *ifp; 2025 2026 IFNET_RLOCK_NOSLEEP(); 2027 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2028 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2029 break; 2030 } 2031 IFNET_RUNLOCK_NOSLEEP(); 2032 return (ifp); 2033} 2034 2035/* 2036 * Hardware specific interface ioctls. 2037 */ 2038static int 2039ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2040{ 2041 struct ifreq *ifr; 2042 struct ifstat *ifs; 2043 int error = 0; 2044 int new_flags, temp_flags; 2045 size_t namelen, onamelen; 2046 size_t descrlen; 2047 char *descrbuf, *odescrbuf; 2048 char new_name[IFNAMSIZ]; 2049 struct ifaddr *ifa; 2050 struct sockaddr_dl *sdl; 2051 2052 ifr = (struct ifreq *)data; 2053 switch (cmd) { 2054 case SIOCGIFINDEX: 2055 ifr->ifr_index = ifp->if_index; 2056 break; 2057 2058 case SIOCGIFFLAGS: 2059 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2060 ifr->ifr_flags = temp_flags & 0xffff; 2061 ifr->ifr_flagshigh = temp_flags >> 16; 2062 break; 2063 2064 case SIOCGIFCAP: 2065 ifr->ifr_reqcap = ifp->if_capabilities; 2066 ifr->ifr_curcap = ifp->if_capenable; 2067 break; 2068 2069#ifdef MAC 2070 case SIOCGIFMAC: 2071 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2072 break; 2073#endif 2074 2075 case SIOCGIFMETRIC: 2076 ifr->ifr_metric = ifp->if_metric; 2077 break; 2078 2079 case SIOCGIFMTU: 2080 ifr->ifr_mtu = ifp->if_mtu; 2081 break; 2082 2083 case SIOCGIFPHYS: 2084 ifr->ifr_phys = ifp->if_physical; 2085 break; 2086 2087 case SIOCGIFDESCR: 2088 error = 0; 2089 sx_slock(&ifdescr_sx); 2090 if (ifp->if_description == NULL) 2091 error = ENOMSG; 2092 else { 2093 /* space for terminating nul */ 2094 descrlen = strlen(ifp->if_description) + 1; 2095 if (ifr->ifr_buffer.length < descrlen) 2096 ifr->ifr_buffer.buffer = NULL; 2097 else 2098 error = copyout(ifp->if_description, 2099 ifr->ifr_buffer.buffer, descrlen); 2100 ifr->ifr_buffer.length = descrlen; 2101 } 2102 sx_sunlock(&ifdescr_sx); 2103 break; 2104 2105 case SIOCSIFDESCR: 2106 error = priv_check(td, PRIV_NET_SETIFDESCR); 2107 if (error) 2108 return (error); 2109 2110 /* 2111 * Copy only (length-1) bytes to make sure that 2112 * if_description is always nul terminated. The 2113 * length parameter is supposed to count the 2114 * terminating nul in. 2115 */ 2116 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2117 return (ENAMETOOLONG); 2118 else if (ifr->ifr_buffer.length == 0) 2119 descrbuf = NULL; 2120 else { 2121 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2122 M_WAITOK | M_ZERO); 2123 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2124 ifr->ifr_buffer.length - 1); 2125 if (error) { 2126 free(descrbuf, M_IFDESCR); 2127 break; 2128 } 2129 } 2130 2131 sx_xlock(&ifdescr_sx); 2132 odescrbuf = ifp->if_description; 2133 ifp->if_description = descrbuf; 2134 sx_xunlock(&ifdescr_sx); 2135 2136 getmicrotime(&ifp->if_lastchange); 2137 free(odescrbuf, M_IFDESCR); 2138 break; 2139 2140 case SIOCGIFFIB: 2141 ifr->ifr_fib = ifp->if_fib; 2142 break; 2143 2144 case SIOCSIFFIB: 2145 error = priv_check(td, PRIV_NET_SETIFFIB); 2146 if (error) 2147 return (error); 2148 if (ifr->ifr_fib >= rt_numfibs) 2149 return (EINVAL); 2150 2151 ifp->if_fib = ifr->ifr_fib; 2152 break; 2153 2154 case SIOCSIFFLAGS: 2155 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2156 if (error) 2157 return (error); 2158 /* 2159 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2160 * check, so we don't need special handling here yet. 2161 */ 2162 new_flags = (ifr->ifr_flags & 0xffff) | 2163 (ifr->ifr_flagshigh << 16); 2164 if (ifp->if_flags & IFF_SMART) { 2165 /* Smart drivers twiddle their own routes */ 2166 } else if (ifp->if_flags & IFF_UP && 2167 (new_flags & IFF_UP) == 0) { 2168 int s = splimp(); 2169 if_down(ifp); 2170 splx(s); 2171 } else if (new_flags & IFF_UP && 2172 (ifp->if_flags & IFF_UP) == 0) { 2173 int s = splimp(); 2174 if_up(ifp); 2175 splx(s); 2176 } 2177 /* See if permanently promiscuous mode bit is about to flip */ 2178 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2179 if (new_flags & IFF_PPROMISC) 2180 ifp->if_flags |= IFF_PROMISC; 2181 else if (ifp->if_pcount == 0) 2182 ifp->if_flags &= ~IFF_PROMISC; 2183 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2184 ifp->if_xname, 2185 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2186 } 2187 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2188 (new_flags &~ IFF_CANTCHANGE); 2189 if (ifp->if_ioctl) { 2190 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2191 } 2192 getmicrotime(&ifp->if_lastchange); 2193 break; 2194 2195 case SIOCSIFCAP: 2196 error = priv_check(td, PRIV_NET_SETIFCAP); 2197 if (error) 2198 return (error); 2199 if (ifp->if_ioctl == NULL) 2200 return (EOPNOTSUPP); 2201 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2202 return (EINVAL); 2203 error = (*ifp->if_ioctl)(ifp, cmd, data); 2204 if (error == 0) 2205 getmicrotime(&ifp->if_lastchange); 2206 break; 2207 2208#ifdef MAC 2209 case SIOCSIFMAC: 2210 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2211 break; 2212#endif 2213 2214 case SIOCSIFNAME: 2215 error = priv_check(td, PRIV_NET_SETIFNAME); 2216 if (error) 2217 return (error); 2218 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2219 if (error != 0) 2220 return (error); 2221 if (new_name[0] == '\0') 2222 return (EINVAL); 2223 if (ifunit(new_name) != NULL) 2224 return (EEXIST); 2225 2226 /* 2227 * XXX: Locking. Nothing else seems to lock if_flags, 2228 * and there are numerous other races with the 2229 * ifunit() checks not being atomic with namespace 2230 * changes (renames, vmoves, if_attach, etc). 2231 */ 2232 ifp->if_flags |= IFF_RENAMING; 2233 2234 /* Announce the departure of the interface. */ 2235 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2236 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2237 2238 log(LOG_INFO, "%s: changing name to '%s'\n", 2239 ifp->if_xname, new_name); 2240 2241 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2242 ifa = ifp->if_addr; 2243 IFA_LOCK(ifa); 2244 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2245 namelen = strlen(new_name); 2246 onamelen = sdl->sdl_nlen; 2247 /* 2248 * Move the address if needed. This is safe because we 2249 * allocate space for a name of length IFNAMSIZ when we 2250 * create this in if_attach(). 2251 */ 2252 if (namelen != onamelen) { 2253 bcopy(sdl->sdl_data + onamelen, 2254 sdl->sdl_data + namelen, sdl->sdl_alen); 2255 } 2256 bcopy(new_name, sdl->sdl_data, namelen); 2257 sdl->sdl_nlen = namelen; 2258 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2259 bzero(sdl->sdl_data, onamelen); 2260 while (namelen != 0) 2261 sdl->sdl_data[--namelen] = 0xff; 2262 IFA_UNLOCK(ifa); 2263 2264 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2265 /* Announce the return of the interface. */ 2266 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2267 2268 ifp->if_flags &= ~IFF_RENAMING; 2269 break; 2270 2271#ifdef VIMAGE 2272 case SIOCSIFVNET: 2273 error = priv_check(td, PRIV_NET_SETIFVNET); 2274 if (error) 2275 return (error); 2276 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2277 break; 2278#endif 2279 2280 case SIOCSIFMETRIC: 2281 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2282 if (error) 2283 return (error); 2284 ifp->if_metric = ifr->ifr_metric; 2285 getmicrotime(&ifp->if_lastchange); 2286 break; 2287 2288 case SIOCSIFPHYS: 2289 error = priv_check(td, PRIV_NET_SETIFPHYS); 2290 if (error) 2291 return (error); 2292 if (ifp->if_ioctl == NULL) 2293 return (EOPNOTSUPP); 2294 error = (*ifp->if_ioctl)(ifp, cmd, data); 2295 if (error == 0) 2296 getmicrotime(&ifp->if_lastchange); 2297 break; 2298 2299 case SIOCSIFMTU: 2300 { 2301 u_long oldmtu = ifp->if_mtu; 2302 2303 error = priv_check(td, PRIV_NET_SETIFMTU); 2304 if (error) 2305 return (error); 2306 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2307 return (EINVAL); 2308 if (ifp->if_ioctl == NULL) 2309 return (EOPNOTSUPP); 2310 error = (*ifp->if_ioctl)(ifp, cmd, data); 2311 if (error == 0) { 2312 getmicrotime(&ifp->if_lastchange); 2313 rt_ifmsg(ifp); 2314 } 2315 /* 2316 * If the link MTU changed, do network layer specific procedure. 2317 */ 2318 if (ifp->if_mtu != oldmtu) { 2319#ifdef INET6 2320 nd6_setmtu(ifp); 2321#endif 2322 } 2323 break; 2324 } 2325 2326 case SIOCADDMULTI: 2327 case SIOCDELMULTI: 2328 if (cmd == SIOCADDMULTI) 2329 error = priv_check(td, PRIV_NET_ADDMULTI); 2330 else 2331 error = priv_check(td, PRIV_NET_DELMULTI); 2332 if (error) 2333 return (error); 2334 2335 /* Don't allow group membership on non-multicast interfaces. */ 2336 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2337 return (EOPNOTSUPP); 2338 2339 /* Don't let users screw up protocols' entries. */ 2340 if (ifr->ifr_addr.sa_family != AF_LINK) 2341 return (EINVAL); 2342 2343 if (cmd == SIOCADDMULTI) { 2344 struct ifmultiaddr *ifma; 2345 2346 /* 2347 * Userland is only permitted to join groups once 2348 * via the if_addmulti() KPI, because it cannot hold 2349 * struct ifmultiaddr * between calls. It may also 2350 * lose a race while we check if the membership 2351 * already exists. 2352 */ 2353 IF_ADDR_RLOCK(ifp); 2354 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2355 IF_ADDR_RUNLOCK(ifp); 2356 if (ifma != NULL) 2357 error = EADDRINUSE; 2358 else 2359 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2360 } else { 2361 error = if_delmulti(ifp, &ifr->ifr_addr); 2362 } 2363 if (error == 0) 2364 getmicrotime(&ifp->if_lastchange); 2365 break; 2366 2367 case SIOCSIFPHYADDR: 2368 case SIOCDIFPHYADDR: 2369#ifdef INET6 2370 case SIOCSIFPHYADDR_IN6: 2371#endif 2372 case SIOCSLIFPHYADDR: 2373 case SIOCSIFMEDIA: 2374 case SIOCSIFGENERIC: 2375 error = priv_check(td, PRIV_NET_HWIOCTL); 2376 if (error) 2377 return (error); 2378 if (ifp->if_ioctl == NULL) 2379 return (EOPNOTSUPP); 2380 error = (*ifp->if_ioctl)(ifp, cmd, data); 2381 if (error == 0) 2382 getmicrotime(&ifp->if_lastchange); 2383 break; 2384 2385 case SIOCGIFSTATUS: 2386 ifs = (struct ifstat *)data; 2387 ifs->ascii[0] = '\0'; 2388 2389 case SIOCGIFPSRCADDR: 2390 case SIOCGIFPDSTADDR: 2391 case SIOCGLIFPHYADDR: 2392 case SIOCGIFMEDIA: 2393 case SIOCGIFGENERIC: 2394 if (ifp->if_ioctl == NULL) 2395 return (EOPNOTSUPP); 2396 error = (*ifp->if_ioctl)(ifp, cmd, data); 2397 break; 2398 2399 case SIOCSIFLLADDR: 2400 error = priv_check(td, PRIV_NET_SETLLADDR); 2401 if (error) 2402 return (error); 2403 error = if_setlladdr(ifp, 2404 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2405 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2406 break; 2407 2408 case SIOCAIFGROUP: 2409 { 2410 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2411 2412 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2413 if (error) 2414 return (error); 2415 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2416 return (error); 2417 break; 2418 } 2419 2420 case SIOCGIFGROUP: 2421 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2422 return (error); 2423 break; 2424 2425 case SIOCDIFGROUP: 2426 { 2427 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2428 2429 error = priv_check(td, PRIV_NET_DELIFGROUP); 2430 if (error) 2431 return (error); 2432 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2433 return (error); 2434 break; 2435 } 2436 2437 default: 2438 error = ENOIOCTL; 2439 break; 2440 } 2441 return (error); 2442} 2443 2444#ifdef COMPAT_FREEBSD32 2445struct ifconf32 { 2446 int32_t ifc_len; 2447 union { 2448 uint32_t ifcu_buf; 2449 uint32_t ifcu_req; 2450 } ifc_ifcu; 2451}; 2452#define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2453#endif 2454 2455/* 2456 * Interface ioctls. 2457 */ 2458int 2459ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2460{ 2461 struct ifnet *ifp; 2462 struct ifreq *ifr; 2463 int error; 2464 int oif_flags; 2465 2466 CURVNET_SET(so->so_vnet); 2467 switch (cmd) { 2468 case SIOCGIFCONF: 2469 case OSIOCGIFCONF: 2470 error = ifconf(cmd, data); 2471 CURVNET_RESTORE(); 2472 return (error); 2473 2474#ifdef COMPAT_FREEBSD32 2475 case SIOCGIFCONF32: 2476 { 2477 struct ifconf32 *ifc32; 2478 struct ifconf ifc; 2479 2480 ifc32 = (struct ifconf32 *)data; 2481 ifc.ifc_len = ifc32->ifc_len; 2482 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2483 2484 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2485 CURVNET_RESTORE(); 2486 if (error == 0) 2487 ifc32->ifc_len = ifc.ifc_len; 2488 return (error); 2489 } 2490#endif 2491 } 2492 ifr = (struct ifreq *)data; 2493 2494 switch (cmd) { 2495#ifdef VIMAGE 2496 case SIOCSIFRVNET: 2497 error = priv_check(td, PRIV_NET_SETIFVNET); 2498 if (error == 0) 2499 error = if_vmove_reclaim(td, ifr->ifr_name, 2500 ifr->ifr_jid); 2501 CURVNET_RESTORE(); 2502 return (error); 2503#endif 2504 case SIOCIFCREATE: 2505 case SIOCIFCREATE2: 2506 error = priv_check(td, PRIV_NET_IFCREATE); 2507 if (error == 0) 2508 error = if_clone_create(ifr->ifr_name, 2509 sizeof(ifr->ifr_name), 2510 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2511 CURVNET_RESTORE(); 2512 return (error); 2513 case SIOCIFDESTROY: 2514 error = priv_check(td, PRIV_NET_IFDESTROY); 2515 if (error == 0) 2516 error = if_clone_destroy(ifr->ifr_name); 2517 CURVNET_RESTORE(); 2518 return (error); 2519 2520 case SIOCIFGCLONERS: 2521 error = if_clone_list((struct if_clonereq *)data); 2522 CURVNET_RESTORE(); 2523 return (error); 2524 case SIOCGIFGMEMB: 2525 error = if_getgroupmembers((struct ifgroupreq *)data); 2526 CURVNET_RESTORE(); 2527 return (error); 2528 } 2529 2530 ifp = ifunit_ref(ifr->ifr_name); 2531 if (ifp == NULL) { 2532 CURVNET_RESTORE(); 2533 return (ENXIO); 2534 } 2535 2536 error = ifhwioctl(cmd, ifp, data, td); 2537 if (error != ENOIOCTL) { 2538 if_rele(ifp); 2539 CURVNET_RESTORE(); 2540 return (error); 2541 } 2542 2543 oif_flags = ifp->if_flags; 2544 if (so->so_proto == NULL) { 2545 if_rele(ifp); 2546 CURVNET_RESTORE(); 2547 return (EOPNOTSUPP); 2548 } 2549#ifndef COMPAT_43 2550 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2551 data, 2552 ifp, td)); 2553 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2554 error = (*ifp->if_ioctl)(ifp, cmd, data); 2555#else 2556 { 2557 u_long ocmd = cmd; 2558 2559 switch (cmd) { 2560 2561 case SIOCSIFDSTADDR: 2562 case SIOCSIFADDR: 2563 case SIOCSIFBRDADDR: 2564 case SIOCSIFNETMASK: 2565#if BYTE_ORDER != BIG_ENDIAN 2566 if (ifr->ifr_addr.sa_family == 0 && 2567 ifr->ifr_addr.sa_len < 16) { 2568 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2569 ifr->ifr_addr.sa_len = 16; 2570 } 2571#else 2572 if (ifr->ifr_addr.sa_len == 0) 2573 ifr->ifr_addr.sa_len = 16; 2574#endif 2575 break; 2576 2577 case OSIOCGIFADDR: 2578 cmd = SIOCGIFADDR; 2579 break; 2580 2581 case OSIOCGIFDSTADDR: 2582 cmd = SIOCGIFDSTADDR; 2583 break; 2584 2585 case OSIOCGIFBRDADDR: 2586 cmd = SIOCGIFBRDADDR; 2587 break; 2588 2589 case OSIOCGIFNETMASK: 2590 cmd = SIOCGIFNETMASK; 2591 } 2592 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2593 cmd, 2594 data, 2595 ifp, td)); 2596 if (error == EOPNOTSUPP && ifp != NULL && 2597 ifp->if_ioctl != NULL) 2598 error = (*ifp->if_ioctl)(ifp, cmd, data); 2599 switch (ocmd) { 2600 2601 case OSIOCGIFADDR: 2602 case OSIOCGIFDSTADDR: 2603 case OSIOCGIFBRDADDR: 2604 case OSIOCGIFNETMASK: 2605 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2606 2607 } 2608 } 2609#endif /* COMPAT_43 */ 2610 2611 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2612#ifdef INET6 2613 if (ifp->if_flags & IFF_UP) { 2614 int s = splimp(); 2615 in6_if_up(ifp); 2616 splx(s); 2617 } 2618#endif 2619 } 2620 if_rele(ifp); 2621 CURVNET_RESTORE(); 2622 return (error); 2623} 2624 2625/* 2626 * The code common to handling reference counted flags, 2627 * e.g., in ifpromisc() and if_allmulti(). 2628 * The "pflag" argument can specify a permanent mode flag to check, 2629 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2630 * 2631 * Only to be used on stack-owned flags, not driver-owned flags. 2632 */ 2633static int 2634if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2635{ 2636 struct ifreq ifr; 2637 int error; 2638 int oldflags, oldcount; 2639 2640 /* Sanity checks to catch programming errors */ 2641 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2642 ("%s: setting driver-owned flag %d", __func__, flag)); 2643 2644 if (onswitch) 2645 KASSERT(*refcount >= 0, 2646 ("%s: increment negative refcount %d for flag %d", 2647 __func__, *refcount, flag)); 2648 else 2649 KASSERT(*refcount > 0, 2650 ("%s: decrement non-positive refcount %d for flag %d", 2651 __func__, *refcount, flag)); 2652 2653 /* In case this mode is permanent, just touch refcount */ 2654 if (ifp->if_flags & pflag) { 2655 *refcount += onswitch ? 1 : -1; 2656 return (0); 2657 } 2658 2659 /* Save ifnet parameters for if_ioctl() may fail */ 2660 oldcount = *refcount; 2661 oldflags = ifp->if_flags; 2662 2663 /* 2664 * See if we aren't the only and touching refcount is enough. 2665 * Actually toggle interface flag if we are the first or last. 2666 */ 2667 if (onswitch) { 2668 if ((*refcount)++) 2669 return (0); 2670 ifp->if_flags |= flag; 2671 } else { 2672 if (--(*refcount)) 2673 return (0); 2674 ifp->if_flags &= ~flag; 2675 } 2676 2677 /* Call down the driver since we've changed interface flags */ 2678 if (ifp->if_ioctl == NULL) { 2679 error = EOPNOTSUPP; 2680 goto recover; 2681 } 2682 ifr.ifr_flags = ifp->if_flags & 0xffff; 2683 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2684 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2685 if (error) 2686 goto recover; 2687 /* Notify userland that interface flags have changed */ 2688 rt_ifmsg(ifp); 2689 return (0); 2690 2691recover: 2692 /* Recover after driver error */ 2693 *refcount = oldcount; 2694 ifp->if_flags = oldflags; 2695 return (error); 2696} 2697 2698/* 2699 * Set/clear promiscuous mode on interface ifp based on the truth value 2700 * of pswitch. The calls are reference counted so that only the first 2701 * "on" request actually has an effect, as does the final "off" request. 2702 * Results are undefined if the "off" and "on" requests are not matched. 2703 */ 2704int 2705ifpromisc(struct ifnet *ifp, int pswitch) 2706{ 2707 int error; 2708 int oldflags = ifp->if_flags; 2709 2710 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2711 &ifp->if_pcount, pswitch); 2712 /* If promiscuous mode status has changed, log a message */ 2713 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2714 log(LOG_INFO, "%s: promiscuous mode %s\n", 2715 ifp->if_xname, 2716 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2717 return (error); 2718} 2719 2720/* 2721 * Return interface configuration 2722 * of system. List may be used 2723 * in later ioctl's (above) to get 2724 * other information. 2725 */ 2726/*ARGSUSED*/ 2727static int 2728ifconf(u_long cmd, caddr_t data) 2729{ 2730 struct ifconf *ifc = (struct ifconf *)data; 2731 struct ifnet *ifp; 2732 struct ifaddr *ifa; 2733 struct ifreq ifr; 2734 struct sbuf *sb; 2735 int error, full = 0, valid_len, max_len; 2736 2737 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2738 max_len = MAXPHYS - 1; 2739 2740 /* Prevent hostile input from being able to crash the system */ 2741 if (ifc->ifc_len <= 0) 2742 return (EINVAL); 2743 2744again: 2745 if (ifc->ifc_len <= max_len) { 2746 max_len = ifc->ifc_len; 2747 full = 1; 2748 } 2749 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2750 max_len = 0; 2751 valid_len = 0; 2752 2753 IFNET_RLOCK(); 2754 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2755 int addrs; 2756 2757 /* 2758 * Zero the ifr_name buffer to make sure we don't 2759 * disclose the contents of the stack. 2760 */ 2761 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2762 2763 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2764 >= sizeof(ifr.ifr_name)) { 2765 sbuf_delete(sb); 2766 IFNET_RUNLOCK(); 2767 return (ENAMETOOLONG); 2768 } 2769 2770 addrs = 0; 2771 IF_ADDR_RLOCK(ifp); 2772 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2773 struct sockaddr *sa = ifa->ifa_addr; 2774 2775 if (prison_if(curthread->td_ucred, sa) != 0) 2776 continue; 2777 addrs++; 2778#ifdef COMPAT_43 2779 if (cmd == OSIOCGIFCONF) { 2780 struct osockaddr *osa = 2781 (struct osockaddr *)&ifr.ifr_addr; 2782 ifr.ifr_addr = *sa; 2783 osa->sa_family = sa->sa_family; 2784 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2785 max_len += sizeof(ifr); 2786 } else 2787#endif 2788 if (sa->sa_len <= sizeof(*sa)) { 2789 ifr.ifr_addr = *sa; 2790 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2791 max_len += sizeof(ifr); 2792 } else { 2793 sbuf_bcat(sb, &ifr, 2794 offsetof(struct ifreq, ifr_addr)); 2795 max_len += offsetof(struct ifreq, ifr_addr); 2796 sbuf_bcat(sb, sa, sa->sa_len); 2797 max_len += sa->sa_len; 2798 } 2799 2800 if (sbuf_error(sb) == 0) 2801 valid_len = sbuf_len(sb); 2802 } 2803 IF_ADDR_RUNLOCK(ifp); 2804 if (addrs == 0) { 2805 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2806 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2807 max_len += sizeof(ifr); 2808 2809 if (sbuf_error(sb) == 0) 2810 valid_len = sbuf_len(sb); 2811 } 2812 } 2813 IFNET_RUNLOCK(); 2814 2815 /* 2816 * If we didn't allocate enough space (uncommon), try again. If 2817 * we have already allocated as much space as we are allowed, 2818 * return what we've got. 2819 */ 2820 if (valid_len != max_len && !full) { 2821 sbuf_delete(sb); 2822 goto again; 2823 } 2824 2825 ifc->ifc_len = valid_len; 2826 sbuf_finish(sb); 2827 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2828 sbuf_delete(sb); 2829 return (error); 2830} 2831 2832/* 2833 * Just like ifpromisc(), but for all-multicast-reception mode. 2834 */ 2835int 2836if_allmulti(struct ifnet *ifp, int onswitch) 2837{ 2838 2839 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2840} 2841 2842struct ifmultiaddr * 2843if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2844{ 2845 struct ifmultiaddr *ifma; 2846 2847 IF_ADDR_LOCK_ASSERT(ifp); 2848 2849 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2850 if (sa->sa_family == AF_LINK) { 2851 if (sa_dl_equal(ifma->ifma_addr, sa)) 2852 break; 2853 } else { 2854 if (sa_equal(ifma->ifma_addr, sa)) 2855 break; 2856 } 2857 } 2858 2859 return ifma; 2860} 2861 2862/* 2863 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2864 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2865 * the ifnet multicast address list here, so the caller must do that and 2866 * other setup work (such as notifying the device driver). The reference 2867 * count is initialized to 1. 2868 */ 2869static struct ifmultiaddr * 2870if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2871 int mflags) 2872{ 2873 struct ifmultiaddr *ifma; 2874 struct sockaddr *dupsa; 2875 2876 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2877 M_ZERO); 2878 if (ifma == NULL) 2879 return (NULL); 2880 2881 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2882 if (dupsa == NULL) { 2883 free(ifma, M_IFMADDR); 2884 return (NULL); 2885 } 2886 bcopy(sa, dupsa, sa->sa_len); 2887 ifma->ifma_addr = dupsa; 2888 2889 ifma->ifma_ifp = ifp; 2890 ifma->ifma_refcount = 1; 2891 ifma->ifma_protospec = NULL; 2892 2893 if (llsa == NULL) { 2894 ifma->ifma_lladdr = NULL; 2895 return (ifma); 2896 } 2897 2898 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2899 if (dupsa == NULL) { 2900 free(ifma->ifma_addr, M_IFMADDR); 2901 free(ifma, M_IFMADDR); 2902 return (NULL); 2903 } 2904 bcopy(llsa, dupsa, llsa->sa_len); 2905 ifma->ifma_lladdr = dupsa; 2906 2907 return (ifma); 2908} 2909 2910/* 2911 * if_freemulti: free ifmultiaddr structure and possibly attached related 2912 * addresses. The caller is responsible for implementing reference 2913 * counting, notifying the driver, handling routing messages, and releasing 2914 * any dependent link layer state. 2915 */ 2916static void 2917if_freemulti(struct ifmultiaddr *ifma) 2918{ 2919 2920 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2921 ifma->ifma_refcount)); 2922 KASSERT(ifma->ifma_protospec == NULL, 2923 ("if_freemulti: protospec not NULL")); 2924 2925 if (ifma->ifma_lladdr != NULL) 2926 free(ifma->ifma_lladdr, M_IFMADDR); 2927 free(ifma->ifma_addr, M_IFMADDR); 2928 free(ifma, M_IFMADDR); 2929} 2930 2931/* 2932 * Register an additional multicast address with a network interface. 2933 * 2934 * - If the address is already present, bump the reference count on the 2935 * address and return. 2936 * - If the address is not link-layer, look up a link layer address. 2937 * - Allocate address structures for one or both addresses, and attach to the 2938 * multicast address list on the interface. If automatically adding a link 2939 * layer address, the protocol address will own a reference to the link 2940 * layer address, to be freed when it is freed. 2941 * - Notify the network device driver of an addition to the multicast address 2942 * list. 2943 * 2944 * 'sa' points to caller-owned memory with the desired multicast address. 2945 * 2946 * 'retifma' will be used to return a pointer to the resulting multicast 2947 * address reference, if desired. 2948 */ 2949int 2950if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2951 struct ifmultiaddr **retifma) 2952{ 2953 struct ifmultiaddr *ifma, *ll_ifma; 2954 struct sockaddr *llsa; 2955 int error; 2956 2957 /* 2958 * If the address is already present, return a new reference to it; 2959 * otherwise, allocate storage and set up a new address. 2960 */ 2961 IF_ADDR_WLOCK(ifp); 2962 ifma = if_findmulti(ifp, sa); 2963 if (ifma != NULL) { 2964 ifma->ifma_refcount++; 2965 if (retifma != NULL) 2966 *retifma = ifma; 2967 IF_ADDR_WUNLOCK(ifp); 2968 return (0); 2969 } 2970 2971 /* 2972 * The address isn't already present; resolve the protocol address 2973 * into a link layer address, and then look that up, bump its 2974 * refcount or allocate an ifma for that also. If 'llsa' was 2975 * returned, we will need to free it later. 2976 */ 2977 llsa = NULL; 2978 ll_ifma = NULL; 2979 if (ifp->if_resolvemulti != NULL) { 2980 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2981 if (error) 2982 goto unlock_out; 2983 } 2984 2985 /* 2986 * Allocate the new address. Don't hook it up yet, as we may also 2987 * need to allocate a link layer multicast address. 2988 */ 2989 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2990 if (ifma == NULL) { 2991 error = ENOMEM; 2992 goto free_llsa_out; 2993 } 2994 2995 /* 2996 * If a link layer address is found, we'll need to see if it's 2997 * already present in the address list, or allocate is as well. 2998 * When this block finishes, the link layer address will be on the 2999 * list. 3000 */ 3001 if (llsa != NULL) { 3002 ll_ifma = if_findmulti(ifp, llsa); 3003 if (ll_ifma == NULL) { 3004 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3005 if (ll_ifma == NULL) { 3006 --ifma->ifma_refcount; 3007 if_freemulti(ifma); 3008 error = ENOMEM; 3009 goto free_llsa_out; 3010 } 3011 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3012 ifma_link); 3013 } else 3014 ll_ifma->ifma_refcount++; 3015 ifma->ifma_llifma = ll_ifma; 3016 } 3017 3018 /* 3019 * We now have a new multicast address, ifma, and possibly a new or 3020 * referenced link layer address. Add the primary address to the 3021 * ifnet address list. 3022 */ 3023 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3024 3025 if (retifma != NULL) 3026 *retifma = ifma; 3027 3028 /* 3029 * Must generate the message while holding the lock so that 'ifma' 3030 * pointer is still valid. 3031 */ 3032 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3033 IF_ADDR_WUNLOCK(ifp); 3034 3035 /* 3036 * We are certain we have added something, so call down to the 3037 * interface to let them know about it. 3038 */ 3039 if (ifp->if_ioctl != NULL) { 3040 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3041 } 3042 3043 if (llsa != NULL) 3044 free(llsa, M_IFMADDR); 3045 3046 return (0); 3047 3048free_llsa_out: 3049 if (llsa != NULL) 3050 free(llsa, M_IFMADDR); 3051 3052unlock_out: 3053 IF_ADDR_WUNLOCK(ifp); 3054 return (error); 3055} 3056 3057/* 3058 * Delete a multicast group membership by network-layer group address. 3059 * 3060 * Returns ENOENT if the entry could not be found. If ifp no longer 3061 * exists, results are undefined. This entry point should only be used 3062 * from subsystems which do appropriate locking to hold ifp for the 3063 * duration of the call. 3064 * Network-layer protocol domains must use if_delmulti_ifma(). 3065 */ 3066int 3067if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3068{ 3069 struct ifmultiaddr *ifma; 3070 int lastref; 3071#ifdef INVARIANTS 3072 struct ifnet *oifp; 3073 3074 IFNET_RLOCK_NOSLEEP(); 3075 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3076 if (ifp == oifp) 3077 break; 3078 if (ifp != oifp) 3079 ifp = NULL; 3080 IFNET_RUNLOCK_NOSLEEP(); 3081 3082 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3083#endif 3084 if (ifp == NULL) 3085 return (ENOENT); 3086 3087 IF_ADDR_WLOCK(ifp); 3088 lastref = 0; 3089 ifma = if_findmulti(ifp, sa); 3090 if (ifma != NULL) 3091 lastref = if_delmulti_locked(ifp, ifma, 0); 3092 IF_ADDR_WUNLOCK(ifp); 3093 3094 if (ifma == NULL) 3095 return (ENOENT); 3096 3097 if (lastref && ifp->if_ioctl != NULL) { 3098 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3099 } 3100 3101 return (0); 3102} 3103 3104/* 3105 * Delete all multicast group membership for an interface. 3106 * Should be used to quickly flush all multicast filters. 3107 */ 3108void 3109if_delallmulti(struct ifnet *ifp) 3110{ 3111 struct ifmultiaddr *ifma; 3112 struct ifmultiaddr *next; 3113 3114 IF_ADDR_WLOCK(ifp); 3115 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3116 if_delmulti_locked(ifp, ifma, 0); 3117 IF_ADDR_WUNLOCK(ifp); 3118} 3119 3120/* 3121 * Delete a multicast group membership by group membership pointer. 3122 * Network-layer protocol domains must use this routine. 3123 * 3124 * It is safe to call this routine if the ifp disappeared. 3125 */ 3126void 3127if_delmulti_ifma(struct ifmultiaddr *ifma) 3128{ 3129 struct ifnet *ifp; 3130 int lastref; 3131 3132 ifp = ifma->ifma_ifp; 3133#ifdef DIAGNOSTIC 3134 if (ifp == NULL) { 3135 printf("%s: ifma_ifp seems to be detached\n", __func__); 3136 } else { 3137 struct ifnet *oifp; 3138 3139 IFNET_RLOCK_NOSLEEP(); 3140 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3141 if (ifp == oifp) 3142 break; 3143 if (ifp != oifp) { 3144 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3145 ifp = NULL; 3146 } 3147 IFNET_RUNLOCK_NOSLEEP(); 3148 } 3149#endif 3150 /* 3151 * If and only if the ifnet instance exists: Acquire the address lock. 3152 */ 3153 if (ifp != NULL) 3154 IF_ADDR_WLOCK(ifp); 3155 3156 lastref = if_delmulti_locked(ifp, ifma, 0); 3157 3158 if (ifp != NULL) { 3159 /* 3160 * If and only if the ifnet instance exists: 3161 * Release the address lock. 3162 * If the group was left: update the hardware hash filter. 3163 */ 3164 IF_ADDR_WUNLOCK(ifp); 3165 if (lastref && ifp->if_ioctl != NULL) { 3166 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3167 } 3168 } 3169} 3170 3171/* 3172 * Perform deletion of network-layer and/or link-layer multicast address. 3173 * 3174 * Return 0 if the reference count was decremented. 3175 * Return 1 if the final reference was released, indicating that the 3176 * hardware hash filter should be reprogrammed. 3177 */ 3178static int 3179if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3180{ 3181 struct ifmultiaddr *ll_ifma; 3182 3183 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3184 KASSERT(ifma->ifma_ifp == ifp, 3185 ("%s: inconsistent ifp %p", __func__, ifp)); 3186 IF_ADDR_WLOCK_ASSERT(ifp); 3187 } 3188 3189 ifp = ifma->ifma_ifp; 3190 3191 /* 3192 * If the ifnet is detaching, null out references to ifnet, 3193 * so that upper protocol layers will notice, and not attempt 3194 * to obtain locks for an ifnet which no longer exists. The 3195 * routing socket announcement must happen before the ifnet 3196 * instance is detached from the system. 3197 */ 3198 if (detaching) { 3199#ifdef DIAGNOSTIC 3200 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3201#endif 3202 /* 3203 * ifp may already be nulled out if we are being reentered 3204 * to delete the ll_ifma. 3205 */ 3206 if (ifp != NULL) { 3207 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3208 ifma->ifma_ifp = NULL; 3209 } 3210 } 3211 3212 if (--ifma->ifma_refcount > 0) 3213 return 0; 3214 3215 /* 3216 * If this ifma is a network-layer ifma, a link-layer ifma may 3217 * have been associated with it. Release it first if so. 3218 */ 3219 ll_ifma = ifma->ifma_llifma; 3220 if (ll_ifma != NULL) { 3221 KASSERT(ifma->ifma_lladdr != NULL, 3222 ("%s: llifma w/o lladdr", __func__)); 3223 if (detaching) 3224 ll_ifma->ifma_ifp = NULL; /* XXX */ 3225 if (--ll_ifma->ifma_refcount == 0) { 3226 if (ifp != NULL) { 3227 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3228 ifma_link); 3229 } 3230 if_freemulti(ll_ifma); 3231 } 3232 } 3233 3234 if (ifp != NULL) 3235 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3236 3237 if_freemulti(ifma); 3238 3239 /* 3240 * The last reference to this instance of struct ifmultiaddr 3241 * was released; the hardware should be notified of this change. 3242 */ 3243 return 1; 3244} 3245 3246/* 3247 * Set the link layer address on an interface. 3248 * 3249 * At this time we only support certain types of interfaces, 3250 * and we don't allow the length of the address to change. 3251 */ 3252int 3253if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3254{ 3255 struct sockaddr_dl *sdl; 3256 struct ifaddr *ifa; 3257 struct ifreq ifr; 3258 3259 IF_ADDR_RLOCK(ifp); 3260 ifa = ifp->if_addr; 3261 if (ifa == NULL) { 3262 IF_ADDR_RUNLOCK(ifp); 3263 return (EINVAL); 3264 } 3265 ifa_ref(ifa); 3266 IF_ADDR_RUNLOCK(ifp); 3267 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3268 if (sdl == NULL) { 3269 ifa_free(ifa); 3270 return (EINVAL); 3271 } 3272 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3273 ifa_free(ifa); 3274 return (EINVAL); 3275 } 3276 switch (ifp->if_type) { 3277 case IFT_ETHER: 3278 case IFT_FDDI: 3279 case IFT_XETHER: 3280 case IFT_ISO88025: 3281 case IFT_L2VLAN: 3282 case IFT_BRIDGE: 3283 case IFT_ARCNET: 3284 case IFT_IEEE8023ADLAG: 3285 case IFT_IEEE80211: 3286 bcopy(lladdr, LLADDR(sdl), len); 3287 ifa_free(ifa); 3288 break; 3289 default: 3290 ifa_free(ifa); 3291 return (ENODEV); 3292 } 3293 3294 /* 3295 * If the interface is already up, we need 3296 * to re-init it in order to reprogram its 3297 * address filter. 3298 */ 3299 if ((ifp->if_flags & IFF_UP) != 0) { 3300 if (ifp->if_ioctl) { 3301 ifp->if_flags &= ~IFF_UP; 3302 ifr.ifr_flags = ifp->if_flags & 0xffff; 3303 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3304 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3305 ifp->if_flags |= IFF_UP; 3306 ifr.ifr_flags = ifp->if_flags & 0xffff; 3307 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3308 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3309 } 3310#ifdef INET 3311 /* 3312 * Also send gratuitous ARPs to notify other nodes about 3313 * the address change. 3314 */ 3315 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3316 if (ifa->ifa_addr->sa_family == AF_INET) 3317 arp_ifinit(ifp, ifa); 3318 } 3319#endif 3320 } 3321 return (0); 3322} 3323 3324/* 3325 * The name argument must be a pointer to storage which will last as 3326 * long as the interface does. For physical devices, the result of 3327 * device_get_name(dev) is a good choice and for pseudo-devices a 3328 * static string works well. 3329 */ 3330void 3331if_initname(struct ifnet *ifp, const char *name, int unit) 3332{ 3333 ifp->if_dname = name; 3334 ifp->if_dunit = unit; 3335 if (unit != IF_DUNIT_NONE) 3336 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3337 else 3338 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3339} 3340 3341int 3342if_printf(struct ifnet *ifp, const char * fmt, ...) 3343{ 3344 va_list ap; 3345 int retval; 3346 3347 retval = printf("%s: ", ifp->if_xname); 3348 va_start(ap, fmt); 3349 retval += vprintf(fmt, ap); 3350 va_end(ap); 3351 return (retval); 3352} 3353 3354void 3355if_start(struct ifnet *ifp) 3356{ 3357 3358 (*(ifp)->if_start)(ifp); 3359} 3360 3361/* 3362 * Backwards compatibility interface for drivers 3363 * that have not implemented it 3364 */ 3365static int 3366if_transmit(struct ifnet *ifp, struct mbuf *m) 3367{ 3368 int error; 3369 3370 IFQ_HANDOFF(ifp, m, error); 3371 return (error); 3372} 3373 3374int 3375if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3376{ 3377 int active = 0; 3378 3379 IF_LOCK(ifq); 3380 if (_IF_QFULL(ifq)) { 3381 _IF_DROP(ifq); 3382 IF_UNLOCK(ifq); 3383 m_freem(m); 3384 return (0); 3385 } 3386 if (ifp != NULL) { 3387 ifp->if_obytes += m->m_pkthdr.len + adjust; 3388 if (m->m_flags & (M_BCAST|M_MCAST)) 3389 ifp->if_omcasts++; 3390 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3391 } 3392 _IF_ENQUEUE(ifq, m); 3393 IF_UNLOCK(ifq); 3394 if (ifp != NULL && !active) 3395 (*(ifp)->if_start)(ifp); 3396 return (1); 3397} 3398 3399void 3400if_register_com_alloc(u_char type, 3401 if_com_alloc_t *a, if_com_free_t *f) 3402{ 3403 3404 KASSERT(if_com_alloc[type] == NULL, 3405 ("if_register_com_alloc: %d already registered", type)); 3406 KASSERT(if_com_free[type] == NULL, 3407 ("if_register_com_alloc: %d free already registered", type)); 3408 3409 if_com_alloc[type] = a; 3410 if_com_free[type] = f; 3411} 3412 3413void 3414if_deregister_com_alloc(u_char type) 3415{ 3416 3417 KASSERT(if_com_alloc[type] != NULL, 3418 ("if_deregister_com_alloc: %d not registered", type)); 3419 KASSERT(if_com_free[type] != NULL, 3420 ("if_deregister_com_alloc: %d free not registered", type)); 3421 if_com_alloc[type] = NULL; 3422 if_com_free[type] = NULL; 3423} 3424