if.c revision 249132
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 249132 2013-04-05 08:22:11Z mav $ 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 121static MALLOC_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 (*bridge_linkstate_p)(struct ifnet *ifp); 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 218static MALLOC_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), 1383 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED, 1384 (struct rtentry **) NULL, rt->rt_fibnum); 1385 if (err) { 1386 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1387 } 1388 } 1389 1390 return (0); 1391} 1392 1393/* 1394 * Wrapper functions for struct ifnet address list locking macros. These are 1395 * used by kernel modules to avoid encoding programming interface or binary 1396 * interface assumptions that may be violated when kernel-internal locking 1397 * approaches change. 1398 */ 1399void 1400if_addr_rlock(struct ifnet *ifp) 1401{ 1402 1403 IF_ADDR_RLOCK(ifp); 1404} 1405 1406void 1407if_addr_runlock(struct ifnet *ifp) 1408{ 1409 1410 IF_ADDR_RUNLOCK(ifp); 1411} 1412 1413void 1414if_maddr_rlock(struct ifnet *ifp) 1415{ 1416 1417 IF_ADDR_RLOCK(ifp); 1418} 1419 1420void 1421if_maddr_runlock(struct ifnet *ifp) 1422{ 1423 1424 IF_ADDR_RUNLOCK(ifp); 1425} 1426 1427/* 1428 * Reference count functions for ifaddrs. 1429 */ 1430void 1431ifa_init(struct ifaddr *ifa) 1432{ 1433 1434 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1435 refcount_init(&ifa->ifa_refcnt, 1); 1436} 1437 1438void 1439ifa_ref(struct ifaddr *ifa) 1440{ 1441 1442 refcount_acquire(&ifa->ifa_refcnt); 1443} 1444 1445void 1446ifa_free(struct ifaddr *ifa) 1447{ 1448 1449 if (refcount_release(&ifa->ifa_refcnt)) { 1450 mtx_destroy(&ifa->ifa_mtx); 1451 free(ifa, M_IFADDR); 1452 } 1453} 1454 1455int 1456ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1457{ 1458 int error = 0; 1459 struct rtentry *rt = NULL; 1460 struct rt_addrinfo info; 1461 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1462 1463 bzero(&info, sizeof(info)); 1464 info.rti_ifp = V_loif; 1465 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1466 info.rti_info[RTAX_DST] = ia; 1467 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1468 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1469 1470 if (error == 0 && rt != NULL) { 1471 RT_LOCK(rt); 1472 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1473 ifa->ifa_ifp->if_type; 1474 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1475 ifa->ifa_ifp->if_index; 1476 RT_REMREF(rt); 1477 RT_UNLOCK(rt); 1478 } else if (error != 0) 1479 log(LOG_INFO, "ifa_add_loopback_route: insertion failed\n"); 1480 1481 return (error); 1482} 1483 1484int 1485ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1486{ 1487 int error = 0; 1488 struct rt_addrinfo info; 1489 struct sockaddr_dl null_sdl; 1490 1491 bzero(&null_sdl, sizeof(null_sdl)); 1492 null_sdl.sdl_len = sizeof(null_sdl); 1493 null_sdl.sdl_family = AF_LINK; 1494 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1495 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1496 bzero(&info, sizeof(info)); 1497 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1498 info.rti_info[RTAX_DST] = ia; 1499 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1500 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1501 1502 if (error != 0) 1503 log(LOG_INFO, "ifa_del_loopback_route: deletion failed\n"); 1504 1505 return (error); 1506} 1507 1508/* 1509 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1510 * structs used to represent other address families, it is necessary 1511 * to perform a different comparison. 1512 */ 1513 1514#define sa_equal(a1, a2) \ 1515 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1516 1517#define sa_dl_equal(a1, a2) \ 1518 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1519 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1520 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1521 LLADDR((struct sockaddr_dl *)(a2)), \ 1522 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1523 1524/* 1525 * Locate an interface based on a complete address. 1526 */ 1527/*ARGSUSED*/ 1528static struct ifaddr * 1529ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1530{ 1531 struct ifnet *ifp; 1532 struct ifaddr *ifa; 1533 1534 IFNET_RLOCK_NOSLEEP(); 1535 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1536 IF_ADDR_RLOCK(ifp); 1537 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1538 if (ifa->ifa_addr->sa_family != addr->sa_family) 1539 continue; 1540 if (sa_equal(addr, ifa->ifa_addr)) { 1541 if (getref) 1542 ifa_ref(ifa); 1543 IF_ADDR_RUNLOCK(ifp); 1544 goto done; 1545 } 1546 /* IP6 doesn't have broadcast */ 1547 if ((ifp->if_flags & IFF_BROADCAST) && 1548 ifa->ifa_broadaddr && 1549 ifa->ifa_broadaddr->sa_len != 0 && 1550 sa_equal(ifa->ifa_broadaddr, addr)) { 1551 if (getref) 1552 ifa_ref(ifa); 1553 IF_ADDR_RUNLOCK(ifp); 1554 goto done; 1555 } 1556 } 1557 IF_ADDR_RUNLOCK(ifp); 1558 } 1559 ifa = NULL; 1560done: 1561 IFNET_RUNLOCK_NOSLEEP(); 1562 return (ifa); 1563} 1564 1565struct ifaddr * 1566ifa_ifwithaddr(struct sockaddr *addr) 1567{ 1568 1569 return (ifa_ifwithaddr_internal(addr, 1)); 1570} 1571 1572int 1573ifa_ifwithaddr_check(struct sockaddr *addr) 1574{ 1575 1576 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1577} 1578 1579/* 1580 * Locate an interface based on the broadcast address. 1581 */ 1582/* ARGSUSED */ 1583struct ifaddr * 1584ifa_ifwithbroadaddr(struct sockaddr *addr) 1585{ 1586 struct ifnet *ifp; 1587 struct ifaddr *ifa; 1588 1589 IFNET_RLOCK_NOSLEEP(); 1590 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1591 IF_ADDR_RLOCK(ifp); 1592 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1593 if (ifa->ifa_addr->sa_family != addr->sa_family) 1594 continue; 1595 if ((ifp->if_flags & IFF_BROADCAST) && 1596 ifa->ifa_broadaddr && 1597 ifa->ifa_broadaddr->sa_len != 0 && 1598 sa_equal(ifa->ifa_broadaddr, addr)) { 1599 ifa_ref(ifa); 1600 IF_ADDR_RUNLOCK(ifp); 1601 goto done; 1602 } 1603 } 1604 IF_ADDR_RUNLOCK(ifp); 1605 } 1606 ifa = NULL; 1607done: 1608 IFNET_RUNLOCK_NOSLEEP(); 1609 return (ifa); 1610} 1611 1612/* 1613 * Locate the point to point interface with a given destination address. 1614 */ 1615/*ARGSUSED*/ 1616struct ifaddr * 1617ifa_ifwithdstaddr(struct sockaddr *addr) 1618{ 1619 struct ifnet *ifp; 1620 struct ifaddr *ifa; 1621 1622 IFNET_RLOCK_NOSLEEP(); 1623 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1624 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1625 continue; 1626 IF_ADDR_RLOCK(ifp); 1627 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1628 if (ifa->ifa_addr->sa_family != addr->sa_family) 1629 continue; 1630 if (ifa->ifa_dstaddr != NULL && 1631 sa_equal(addr, ifa->ifa_dstaddr)) { 1632 ifa_ref(ifa); 1633 IF_ADDR_RUNLOCK(ifp); 1634 goto done; 1635 } 1636 } 1637 IF_ADDR_RUNLOCK(ifp); 1638 } 1639 ifa = NULL; 1640done: 1641 IFNET_RUNLOCK_NOSLEEP(); 1642 return (ifa); 1643} 1644 1645/* 1646 * Find an interface on a specific network. If many, choice 1647 * is most specific found. 1648 */ 1649struct ifaddr * 1650ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1651{ 1652 struct ifnet *ifp; 1653 struct ifaddr *ifa; 1654 struct ifaddr *ifa_maybe = NULL; 1655 u_int af = addr->sa_family; 1656 char *addr_data = addr->sa_data, *cplim; 1657 1658 /* 1659 * AF_LINK addresses can be looked up directly by their index number, 1660 * so do that if we can. 1661 */ 1662 if (af == AF_LINK) { 1663 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1664 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1665 return (ifaddr_byindex(sdl->sdl_index)); 1666 } 1667 1668 /* 1669 * Scan though each interface, looking for ones that have addresses 1670 * in this address family. Maintain a reference on ifa_maybe once 1671 * we find one, as we release the IF_ADDR_RLOCK() that kept it stable 1672 * when we move onto the next interface. 1673 */ 1674 IFNET_RLOCK_NOSLEEP(); 1675 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1676 IF_ADDR_RLOCK(ifp); 1677 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1678 char *cp, *cp2, *cp3; 1679 1680 if (ifa->ifa_addr->sa_family != af) 1681next: continue; 1682 if (af == AF_INET && 1683 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1684 /* 1685 * This is a bit broken as it doesn't 1686 * take into account that the remote end may 1687 * be a single node in the network we are 1688 * looking for. 1689 * The trouble is that we don't know the 1690 * netmask for the remote end. 1691 */ 1692 if (ifa->ifa_dstaddr != NULL && 1693 sa_equal(addr, ifa->ifa_dstaddr)) { 1694 ifa_ref(ifa); 1695 IF_ADDR_RUNLOCK(ifp); 1696 goto done; 1697 } 1698 } else { 1699 /* 1700 * if we have a special address handler, 1701 * then use it instead of the generic one. 1702 */ 1703 if (ifa->ifa_claim_addr) { 1704 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1705 ifa_ref(ifa); 1706 IF_ADDR_RUNLOCK(ifp); 1707 goto done; 1708 } 1709 continue; 1710 } 1711 1712 /* 1713 * Scan all the bits in the ifa's address. 1714 * If a bit dissagrees with what we are 1715 * looking for, mask it with the netmask 1716 * to see if it really matters. 1717 * (A byte at a time) 1718 */ 1719 if (ifa->ifa_netmask == 0) 1720 continue; 1721 cp = addr_data; 1722 cp2 = ifa->ifa_addr->sa_data; 1723 cp3 = ifa->ifa_netmask->sa_data; 1724 cplim = ifa->ifa_netmask->sa_len 1725 + (char *)ifa->ifa_netmask; 1726 while (cp3 < cplim) 1727 if ((*cp++ ^ *cp2++) & *cp3++) 1728 goto next; /* next address! */ 1729 /* 1730 * If the netmask of what we just found 1731 * is more specific than what we had before 1732 * (if we had one) then remember the new one 1733 * before continuing to search 1734 * for an even better one. 1735 */ 1736 if (ifa_maybe == NULL || 1737 rn_refines((caddr_t)ifa->ifa_netmask, 1738 (caddr_t)ifa_maybe->ifa_netmask)) { 1739 if (ifa_maybe != NULL) 1740 ifa_free(ifa_maybe); 1741 ifa_maybe = ifa; 1742 ifa_ref(ifa_maybe); 1743 } 1744 } 1745 } 1746 IF_ADDR_RUNLOCK(ifp); 1747 } 1748 ifa = ifa_maybe; 1749 ifa_maybe = NULL; 1750done: 1751 IFNET_RUNLOCK_NOSLEEP(); 1752 if (ifa_maybe != NULL) 1753 ifa_free(ifa_maybe); 1754 return (ifa); 1755} 1756 1757/* 1758 * Find an interface address specific to an interface best matching 1759 * a given address. 1760 */ 1761struct ifaddr * 1762ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1763{ 1764 struct ifaddr *ifa; 1765 char *cp, *cp2, *cp3; 1766 char *cplim; 1767 struct ifaddr *ifa_maybe = NULL; 1768 u_int af = addr->sa_family; 1769 1770 if (af >= AF_MAX) 1771 return (NULL); 1772 IF_ADDR_RLOCK(ifp); 1773 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1774 if (ifa->ifa_addr->sa_family != af) 1775 continue; 1776 if (ifa_maybe == NULL) 1777 ifa_maybe = ifa; 1778 if (ifa->ifa_netmask == 0) { 1779 if (sa_equal(addr, ifa->ifa_addr) || 1780 (ifa->ifa_dstaddr && 1781 sa_equal(addr, ifa->ifa_dstaddr))) 1782 goto done; 1783 continue; 1784 } 1785 if (ifp->if_flags & IFF_POINTOPOINT) { 1786 if (sa_equal(addr, ifa->ifa_dstaddr)) 1787 goto done; 1788 } else { 1789 cp = addr->sa_data; 1790 cp2 = ifa->ifa_addr->sa_data; 1791 cp3 = ifa->ifa_netmask->sa_data; 1792 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1793 for (; cp3 < cplim; cp3++) 1794 if ((*cp++ ^ *cp2++) & *cp3) 1795 break; 1796 if (cp3 == cplim) 1797 goto done; 1798 } 1799 } 1800 ifa = ifa_maybe; 1801done: 1802 if (ifa != NULL) 1803 ifa_ref(ifa); 1804 IF_ADDR_RUNLOCK(ifp); 1805 return (ifa); 1806} 1807 1808#include <net/if_llatbl.h> 1809 1810/* 1811 * Default action when installing a route with a Link Level gateway. 1812 * Lookup an appropriate real ifa to point to. 1813 * This should be moved to /sys/net/link.c eventually. 1814 */ 1815static void 1816link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1817{ 1818 struct ifaddr *ifa, *oifa; 1819 struct sockaddr *dst; 1820 struct ifnet *ifp; 1821 1822 RT_LOCK_ASSERT(rt); 1823 1824 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1825 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1826 return; 1827 ifa = ifaof_ifpforaddr(dst, ifp); 1828 if (ifa) { 1829 oifa = rt->rt_ifa; 1830 rt->rt_ifa = ifa; 1831 ifa_free(oifa); 1832 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1833 ifa->ifa_rtrequest(cmd, rt, info); 1834 } 1835} 1836 1837/* 1838 * Mark an interface down and notify protocols of 1839 * the transition. 1840 * NOTE: must be called at splnet or eqivalent. 1841 */ 1842static void 1843if_unroute(struct ifnet *ifp, int flag, int fam) 1844{ 1845 struct ifaddr *ifa; 1846 1847 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1848 1849 ifp->if_flags &= ~flag; 1850 getmicrotime(&ifp->if_lastchange); 1851 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1852 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1853 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1854 ifp->if_qflush(ifp); 1855 1856 if (ifp->if_carp) 1857 (*carp_linkstate_p)(ifp); 1858 rt_ifmsg(ifp); 1859} 1860 1861/* 1862 * Mark an interface up and notify protocols of 1863 * the transition. 1864 * NOTE: must be called at splnet or eqivalent. 1865 */ 1866static void 1867if_route(struct ifnet *ifp, int flag, int fam) 1868{ 1869 struct ifaddr *ifa; 1870 1871 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1872 1873 ifp->if_flags |= flag; 1874 getmicrotime(&ifp->if_lastchange); 1875 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1876 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1877 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1878 if (ifp->if_carp) 1879 (*carp_linkstate_p)(ifp); 1880 rt_ifmsg(ifp); 1881#ifdef INET6 1882 in6_if_up(ifp); 1883#endif 1884} 1885 1886void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1887void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1888struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1889struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1890int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1891int (*vlan_setcookie_p)(struct ifnet *, void *); 1892void *(*vlan_cookie_p)(struct ifnet *); 1893 1894/* 1895 * Handle a change in the interface link state. To avoid LORs 1896 * between driver lock and upper layer locks, as well as possible 1897 * recursions, we post event to taskqueue, and all job 1898 * is done in static do_link_state_change(). 1899 */ 1900void 1901if_link_state_change(struct ifnet *ifp, int link_state) 1902{ 1903 /* Return if state hasn't changed. */ 1904 if (ifp->if_link_state == link_state) 1905 return; 1906 1907 ifp->if_link_state = link_state; 1908 1909 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1910} 1911 1912static void 1913do_link_state_change(void *arg, int pending) 1914{ 1915 struct ifnet *ifp = (struct ifnet *)arg; 1916 int link_state = ifp->if_link_state; 1917 CURVNET_SET(ifp->if_vnet); 1918 1919 /* Notify that the link state has changed. */ 1920 rt_ifmsg(ifp); 1921 if (ifp->if_vlantrunk != NULL) 1922 (*vlan_link_state_p)(ifp); 1923 1924 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1925 IFP2AC(ifp)->ac_netgraph != NULL) 1926 (*ng_ether_link_state_p)(ifp, link_state); 1927 if (ifp->if_carp) 1928 (*carp_linkstate_p)(ifp); 1929 if (ifp->if_bridge) 1930 (*bridge_linkstate_p)(ifp); 1931 if (ifp->if_lagg) 1932 (*lagg_linkstate_p)(ifp, link_state); 1933 1934 if (IS_DEFAULT_VNET(curvnet)) 1935 devctl_notify("IFNET", ifp->if_xname, 1936 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1937 NULL); 1938 if (pending > 1) 1939 if_printf(ifp, "%d link states coalesced\n", pending); 1940 if (log_link_state_change) 1941 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1942 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1943 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 1944 CURVNET_RESTORE(); 1945} 1946 1947/* 1948 * Mark an interface down and notify protocols of 1949 * the transition. 1950 * NOTE: must be called at splnet or eqivalent. 1951 */ 1952void 1953if_down(struct ifnet *ifp) 1954{ 1955 1956 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1957} 1958 1959/* 1960 * Mark an interface up and notify protocols of 1961 * the transition. 1962 * NOTE: must be called at splnet or eqivalent. 1963 */ 1964void 1965if_up(struct ifnet *ifp) 1966{ 1967 1968 if_route(ifp, IFF_UP, AF_UNSPEC); 1969} 1970 1971/* 1972 * Flush an interface queue. 1973 */ 1974void 1975if_qflush(struct ifnet *ifp) 1976{ 1977 struct mbuf *m, *n; 1978 struct ifaltq *ifq; 1979 1980 ifq = &ifp->if_snd; 1981 IFQ_LOCK(ifq); 1982#ifdef ALTQ 1983 if (ALTQ_IS_ENABLED(ifq)) 1984 ALTQ_PURGE(ifq); 1985#endif 1986 n = ifq->ifq_head; 1987 while ((m = n) != 0) { 1988 n = m->m_act; 1989 m_freem(m); 1990 } 1991 ifq->ifq_head = 0; 1992 ifq->ifq_tail = 0; 1993 ifq->ifq_len = 0; 1994 IFQ_UNLOCK(ifq); 1995} 1996 1997/* 1998 * Map interface name to interface structure pointer, with or without 1999 * returning a reference. 2000 */ 2001struct ifnet * 2002ifunit_ref(const char *name) 2003{ 2004 struct ifnet *ifp; 2005 2006 IFNET_RLOCK_NOSLEEP(); 2007 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2008 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2009 !(ifp->if_flags & IFF_DYING)) 2010 break; 2011 } 2012 if (ifp != NULL) 2013 if_ref(ifp); 2014 IFNET_RUNLOCK_NOSLEEP(); 2015 return (ifp); 2016} 2017 2018struct ifnet * 2019ifunit(const char *name) 2020{ 2021 struct ifnet *ifp; 2022 2023 IFNET_RLOCK_NOSLEEP(); 2024 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2025 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2026 break; 2027 } 2028 IFNET_RUNLOCK_NOSLEEP(); 2029 return (ifp); 2030} 2031 2032/* 2033 * Hardware specific interface ioctls. 2034 */ 2035static int 2036ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2037{ 2038 struct ifreq *ifr; 2039 struct ifstat *ifs; 2040 int error = 0; 2041 int new_flags, temp_flags; 2042 size_t namelen, onamelen; 2043 size_t descrlen; 2044 char *descrbuf, *odescrbuf; 2045 char new_name[IFNAMSIZ]; 2046 struct ifaddr *ifa; 2047 struct sockaddr_dl *sdl; 2048 2049 ifr = (struct ifreq *)data; 2050 switch (cmd) { 2051 case SIOCGIFINDEX: 2052 ifr->ifr_index = ifp->if_index; 2053 break; 2054 2055 case SIOCGIFFLAGS: 2056 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2057 ifr->ifr_flags = temp_flags & 0xffff; 2058 ifr->ifr_flagshigh = temp_flags >> 16; 2059 break; 2060 2061 case SIOCGIFCAP: 2062 ifr->ifr_reqcap = ifp->if_capabilities; 2063 ifr->ifr_curcap = ifp->if_capenable; 2064 break; 2065 2066#ifdef MAC 2067 case SIOCGIFMAC: 2068 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2069 break; 2070#endif 2071 2072 case SIOCGIFMETRIC: 2073 ifr->ifr_metric = ifp->if_metric; 2074 break; 2075 2076 case SIOCGIFMTU: 2077 ifr->ifr_mtu = ifp->if_mtu; 2078 break; 2079 2080 case SIOCGIFPHYS: 2081 ifr->ifr_phys = ifp->if_physical; 2082 break; 2083 2084 case SIOCGIFDESCR: 2085 error = 0; 2086 sx_slock(&ifdescr_sx); 2087 if (ifp->if_description == NULL) 2088 error = ENOMSG; 2089 else { 2090 /* space for terminating nul */ 2091 descrlen = strlen(ifp->if_description) + 1; 2092 if (ifr->ifr_buffer.length < descrlen) 2093 ifr->ifr_buffer.buffer = NULL; 2094 else 2095 error = copyout(ifp->if_description, 2096 ifr->ifr_buffer.buffer, descrlen); 2097 ifr->ifr_buffer.length = descrlen; 2098 } 2099 sx_sunlock(&ifdescr_sx); 2100 break; 2101 2102 case SIOCSIFDESCR: 2103 error = priv_check(td, PRIV_NET_SETIFDESCR); 2104 if (error) 2105 return (error); 2106 2107 /* 2108 * Copy only (length-1) bytes to make sure that 2109 * if_description is always nul terminated. The 2110 * length parameter is supposed to count the 2111 * terminating nul in. 2112 */ 2113 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2114 return (ENAMETOOLONG); 2115 else if (ifr->ifr_buffer.length == 0) 2116 descrbuf = NULL; 2117 else { 2118 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2119 M_WAITOK | M_ZERO); 2120 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2121 ifr->ifr_buffer.length - 1); 2122 if (error) { 2123 free(descrbuf, M_IFDESCR); 2124 break; 2125 } 2126 } 2127 2128 sx_xlock(&ifdescr_sx); 2129 odescrbuf = ifp->if_description; 2130 ifp->if_description = descrbuf; 2131 sx_xunlock(&ifdescr_sx); 2132 2133 getmicrotime(&ifp->if_lastchange); 2134 free(odescrbuf, M_IFDESCR); 2135 break; 2136 2137 case SIOCGIFFIB: 2138 ifr->ifr_fib = ifp->if_fib; 2139 break; 2140 2141 case SIOCSIFFIB: 2142 error = priv_check(td, PRIV_NET_SETIFFIB); 2143 if (error) 2144 return (error); 2145 if (ifr->ifr_fib >= rt_numfibs) 2146 return (EINVAL); 2147 2148 ifp->if_fib = ifr->ifr_fib; 2149 break; 2150 2151 case SIOCSIFFLAGS: 2152 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2153 if (error) 2154 return (error); 2155 /* 2156 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2157 * check, so we don't need special handling here yet. 2158 */ 2159 new_flags = (ifr->ifr_flags & 0xffff) | 2160 (ifr->ifr_flagshigh << 16); 2161 if (ifp->if_flags & IFF_SMART) { 2162 /* Smart drivers twiddle their own routes */ 2163 } else if (ifp->if_flags & IFF_UP && 2164 (new_flags & IFF_UP) == 0) { 2165 int s = splimp(); 2166 if_down(ifp); 2167 splx(s); 2168 } else if (new_flags & IFF_UP && 2169 (ifp->if_flags & IFF_UP) == 0) { 2170 int s = splimp(); 2171 if_up(ifp); 2172 splx(s); 2173 } 2174 /* See if permanently promiscuous mode bit is about to flip */ 2175 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2176 if (new_flags & IFF_PPROMISC) 2177 ifp->if_flags |= IFF_PROMISC; 2178 else if (ifp->if_pcount == 0) 2179 ifp->if_flags &= ~IFF_PROMISC; 2180 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2181 ifp->if_xname, 2182 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2183 } 2184 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2185 (new_flags &~ IFF_CANTCHANGE); 2186 if (ifp->if_ioctl) { 2187 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2188 } 2189 getmicrotime(&ifp->if_lastchange); 2190 break; 2191 2192 case SIOCSIFCAP: 2193 error = priv_check(td, PRIV_NET_SETIFCAP); 2194 if (error) 2195 return (error); 2196 if (ifp->if_ioctl == NULL) 2197 return (EOPNOTSUPP); 2198 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2199 return (EINVAL); 2200 error = (*ifp->if_ioctl)(ifp, cmd, data); 2201 if (error == 0) 2202 getmicrotime(&ifp->if_lastchange); 2203 break; 2204 2205#ifdef MAC 2206 case SIOCSIFMAC: 2207 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2208 break; 2209#endif 2210 2211 case SIOCSIFNAME: 2212 error = priv_check(td, PRIV_NET_SETIFNAME); 2213 if (error) 2214 return (error); 2215 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2216 if (error != 0) 2217 return (error); 2218 if (new_name[0] == '\0') 2219 return (EINVAL); 2220 if (ifunit(new_name) != NULL) 2221 return (EEXIST); 2222 2223 /* 2224 * XXX: Locking. Nothing else seems to lock if_flags, 2225 * and there are numerous other races with the 2226 * ifunit() checks not being atomic with namespace 2227 * changes (renames, vmoves, if_attach, etc). 2228 */ 2229 ifp->if_flags |= IFF_RENAMING; 2230 2231 /* Announce the departure of the interface. */ 2232 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2233 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2234 2235 log(LOG_INFO, "%s: changing name to '%s'\n", 2236 ifp->if_xname, new_name); 2237 2238 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2239 ifa = ifp->if_addr; 2240 IFA_LOCK(ifa); 2241 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2242 namelen = strlen(new_name); 2243 onamelen = sdl->sdl_nlen; 2244 /* 2245 * Move the address if needed. This is safe because we 2246 * allocate space for a name of length IFNAMSIZ when we 2247 * create this in if_attach(). 2248 */ 2249 if (namelen != onamelen) { 2250 bcopy(sdl->sdl_data + onamelen, 2251 sdl->sdl_data + namelen, sdl->sdl_alen); 2252 } 2253 bcopy(new_name, sdl->sdl_data, namelen); 2254 sdl->sdl_nlen = namelen; 2255 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2256 bzero(sdl->sdl_data, onamelen); 2257 while (namelen != 0) 2258 sdl->sdl_data[--namelen] = 0xff; 2259 IFA_UNLOCK(ifa); 2260 2261 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2262 /* Announce the return of the interface. */ 2263 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2264 2265 ifp->if_flags &= ~IFF_RENAMING; 2266 break; 2267 2268#ifdef VIMAGE 2269 case SIOCSIFVNET: 2270 error = priv_check(td, PRIV_NET_SETIFVNET); 2271 if (error) 2272 return (error); 2273 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2274 break; 2275#endif 2276 2277 case SIOCSIFMETRIC: 2278 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2279 if (error) 2280 return (error); 2281 ifp->if_metric = ifr->ifr_metric; 2282 getmicrotime(&ifp->if_lastchange); 2283 break; 2284 2285 case SIOCSIFPHYS: 2286 error = priv_check(td, PRIV_NET_SETIFPHYS); 2287 if (error) 2288 return (error); 2289 if (ifp->if_ioctl == NULL) 2290 return (EOPNOTSUPP); 2291 error = (*ifp->if_ioctl)(ifp, cmd, data); 2292 if (error == 0) 2293 getmicrotime(&ifp->if_lastchange); 2294 break; 2295 2296 case SIOCSIFMTU: 2297 { 2298 u_long oldmtu = ifp->if_mtu; 2299 2300 error = priv_check(td, PRIV_NET_SETIFMTU); 2301 if (error) 2302 return (error); 2303 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2304 return (EINVAL); 2305 if (ifp->if_ioctl == NULL) 2306 return (EOPNOTSUPP); 2307 error = (*ifp->if_ioctl)(ifp, cmd, data); 2308 if (error == 0) { 2309 getmicrotime(&ifp->if_lastchange); 2310 rt_ifmsg(ifp); 2311 } 2312 /* 2313 * If the link MTU changed, do network layer specific procedure. 2314 */ 2315 if (ifp->if_mtu != oldmtu) { 2316#ifdef INET6 2317 nd6_setmtu(ifp); 2318#endif 2319 } 2320 break; 2321 } 2322 2323 case SIOCADDMULTI: 2324 case SIOCDELMULTI: 2325 if (cmd == SIOCADDMULTI) 2326 error = priv_check(td, PRIV_NET_ADDMULTI); 2327 else 2328 error = priv_check(td, PRIV_NET_DELMULTI); 2329 if (error) 2330 return (error); 2331 2332 /* Don't allow group membership on non-multicast interfaces. */ 2333 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2334 return (EOPNOTSUPP); 2335 2336 /* Don't let users screw up protocols' entries. */ 2337 if (ifr->ifr_addr.sa_family != AF_LINK) 2338 return (EINVAL); 2339 2340 if (cmd == SIOCADDMULTI) { 2341 struct ifmultiaddr *ifma; 2342 2343 /* 2344 * Userland is only permitted to join groups once 2345 * via the if_addmulti() KPI, because it cannot hold 2346 * struct ifmultiaddr * between calls. It may also 2347 * lose a race while we check if the membership 2348 * already exists. 2349 */ 2350 IF_ADDR_RLOCK(ifp); 2351 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2352 IF_ADDR_RUNLOCK(ifp); 2353 if (ifma != NULL) 2354 error = EADDRINUSE; 2355 else 2356 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2357 } else { 2358 error = if_delmulti(ifp, &ifr->ifr_addr); 2359 } 2360 if (error == 0) 2361 getmicrotime(&ifp->if_lastchange); 2362 break; 2363 2364 case SIOCSIFPHYADDR: 2365 case SIOCDIFPHYADDR: 2366#ifdef INET6 2367 case SIOCSIFPHYADDR_IN6: 2368#endif 2369 case SIOCSLIFPHYADDR: 2370 case SIOCSIFMEDIA: 2371 case SIOCSIFGENERIC: 2372 error = priv_check(td, PRIV_NET_HWIOCTL); 2373 if (error) 2374 return (error); 2375 if (ifp->if_ioctl == NULL) 2376 return (EOPNOTSUPP); 2377 error = (*ifp->if_ioctl)(ifp, cmd, data); 2378 if (error == 0) 2379 getmicrotime(&ifp->if_lastchange); 2380 break; 2381 2382 case SIOCGIFSTATUS: 2383 ifs = (struct ifstat *)data; 2384 ifs->ascii[0] = '\0'; 2385 2386 case SIOCGIFPSRCADDR: 2387 case SIOCGIFPDSTADDR: 2388 case SIOCGLIFPHYADDR: 2389 case SIOCGIFMEDIA: 2390 case SIOCGIFGENERIC: 2391 if (ifp->if_ioctl == NULL) 2392 return (EOPNOTSUPP); 2393 error = (*ifp->if_ioctl)(ifp, cmd, data); 2394 break; 2395 2396 case SIOCSIFLLADDR: 2397 error = priv_check(td, PRIV_NET_SETLLADDR); 2398 if (error) 2399 return (error); 2400 error = if_setlladdr(ifp, 2401 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2402 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2403 break; 2404 2405 case SIOCAIFGROUP: 2406 { 2407 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2408 2409 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2410 if (error) 2411 return (error); 2412 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2413 return (error); 2414 break; 2415 } 2416 2417 case SIOCGIFGROUP: 2418 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2419 return (error); 2420 break; 2421 2422 case SIOCDIFGROUP: 2423 { 2424 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2425 2426 error = priv_check(td, PRIV_NET_DELIFGROUP); 2427 if (error) 2428 return (error); 2429 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2430 return (error); 2431 break; 2432 } 2433 2434 default: 2435 error = ENOIOCTL; 2436 break; 2437 } 2438 return (error); 2439} 2440 2441#ifdef COMPAT_FREEBSD32 2442struct ifconf32 { 2443 int32_t ifc_len; 2444 union { 2445 uint32_t ifcu_buf; 2446 uint32_t ifcu_req; 2447 } ifc_ifcu; 2448}; 2449#define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2450#endif 2451 2452/* 2453 * Interface ioctls. 2454 */ 2455int 2456ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2457{ 2458 struct ifnet *ifp; 2459 struct ifreq *ifr; 2460 int error; 2461 int oif_flags; 2462 2463 CURVNET_SET(so->so_vnet); 2464 switch (cmd) { 2465 case SIOCGIFCONF: 2466 case OSIOCGIFCONF: 2467 error = ifconf(cmd, data); 2468 CURVNET_RESTORE(); 2469 return (error); 2470 2471#ifdef COMPAT_FREEBSD32 2472 case SIOCGIFCONF32: 2473 { 2474 struct ifconf32 *ifc32; 2475 struct ifconf ifc; 2476 2477 ifc32 = (struct ifconf32 *)data; 2478 ifc.ifc_len = ifc32->ifc_len; 2479 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2480 2481 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2482 CURVNET_RESTORE(); 2483 if (error == 0) 2484 ifc32->ifc_len = ifc.ifc_len; 2485 return (error); 2486 } 2487#endif 2488 } 2489 ifr = (struct ifreq *)data; 2490 2491 switch (cmd) { 2492#ifdef VIMAGE 2493 case SIOCSIFRVNET: 2494 error = priv_check(td, PRIV_NET_SETIFVNET); 2495 if (error == 0) 2496 error = if_vmove_reclaim(td, ifr->ifr_name, 2497 ifr->ifr_jid); 2498 CURVNET_RESTORE(); 2499 return (error); 2500#endif 2501 case SIOCIFCREATE: 2502 case SIOCIFCREATE2: 2503 error = priv_check(td, PRIV_NET_IFCREATE); 2504 if (error == 0) 2505 error = if_clone_create(ifr->ifr_name, 2506 sizeof(ifr->ifr_name), 2507 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2508 CURVNET_RESTORE(); 2509 return (error); 2510 case SIOCIFDESTROY: 2511 error = priv_check(td, PRIV_NET_IFDESTROY); 2512 if (error == 0) 2513 error = if_clone_destroy(ifr->ifr_name); 2514 CURVNET_RESTORE(); 2515 return (error); 2516 2517 case SIOCIFGCLONERS: 2518 error = if_clone_list((struct if_clonereq *)data); 2519 CURVNET_RESTORE(); 2520 return (error); 2521 case SIOCGIFGMEMB: 2522 error = if_getgroupmembers((struct ifgroupreq *)data); 2523 CURVNET_RESTORE(); 2524 return (error); 2525 } 2526 2527 ifp = ifunit_ref(ifr->ifr_name); 2528 if (ifp == NULL) { 2529 CURVNET_RESTORE(); 2530 return (ENXIO); 2531 } 2532 2533 error = ifhwioctl(cmd, ifp, data, td); 2534 if (error != ENOIOCTL) { 2535 if_rele(ifp); 2536 CURVNET_RESTORE(); 2537 return (error); 2538 } 2539 2540 oif_flags = ifp->if_flags; 2541 if (so->so_proto == NULL) { 2542 if_rele(ifp); 2543 CURVNET_RESTORE(); 2544 return (EOPNOTSUPP); 2545 } 2546#ifndef COMPAT_43 2547 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2548 data, 2549 ifp, td)); 2550 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2551 error = (*ifp->if_ioctl)(ifp, cmd, data); 2552#else 2553 { 2554 u_long ocmd = cmd; 2555 2556 switch (cmd) { 2557 2558 case SIOCSIFDSTADDR: 2559 case SIOCSIFADDR: 2560 case SIOCSIFBRDADDR: 2561 case SIOCSIFNETMASK: 2562#if BYTE_ORDER != BIG_ENDIAN 2563 if (ifr->ifr_addr.sa_family == 0 && 2564 ifr->ifr_addr.sa_len < 16) { 2565 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2566 ifr->ifr_addr.sa_len = 16; 2567 } 2568#else 2569 if (ifr->ifr_addr.sa_len == 0) 2570 ifr->ifr_addr.sa_len = 16; 2571#endif 2572 break; 2573 2574 case OSIOCGIFADDR: 2575 cmd = SIOCGIFADDR; 2576 break; 2577 2578 case OSIOCGIFDSTADDR: 2579 cmd = SIOCGIFDSTADDR; 2580 break; 2581 2582 case OSIOCGIFBRDADDR: 2583 cmd = SIOCGIFBRDADDR; 2584 break; 2585 2586 case OSIOCGIFNETMASK: 2587 cmd = SIOCGIFNETMASK; 2588 } 2589 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2590 cmd, 2591 data, 2592 ifp, td)); 2593 if (error == EOPNOTSUPP && ifp != NULL && 2594 ifp->if_ioctl != NULL) 2595 error = (*ifp->if_ioctl)(ifp, cmd, data); 2596 switch (ocmd) { 2597 2598 case OSIOCGIFADDR: 2599 case OSIOCGIFDSTADDR: 2600 case OSIOCGIFBRDADDR: 2601 case OSIOCGIFNETMASK: 2602 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2603 2604 } 2605 } 2606#endif /* COMPAT_43 */ 2607 2608 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2609#ifdef INET6 2610 if (ifp->if_flags & IFF_UP) { 2611 int s = splimp(); 2612 in6_if_up(ifp); 2613 splx(s); 2614 } 2615#endif 2616 } 2617 if_rele(ifp); 2618 CURVNET_RESTORE(); 2619 return (error); 2620} 2621 2622/* 2623 * The code common to handling reference counted flags, 2624 * e.g., in ifpromisc() and if_allmulti(). 2625 * The "pflag" argument can specify a permanent mode flag to check, 2626 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2627 * 2628 * Only to be used on stack-owned flags, not driver-owned flags. 2629 */ 2630static int 2631if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2632{ 2633 struct ifreq ifr; 2634 int error; 2635 int oldflags, oldcount; 2636 2637 /* Sanity checks to catch programming errors */ 2638 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2639 ("%s: setting driver-owned flag %d", __func__, flag)); 2640 2641 if (onswitch) 2642 KASSERT(*refcount >= 0, 2643 ("%s: increment negative refcount %d for flag %d", 2644 __func__, *refcount, flag)); 2645 else 2646 KASSERT(*refcount > 0, 2647 ("%s: decrement non-positive refcount %d for flag %d", 2648 __func__, *refcount, flag)); 2649 2650 /* In case this mode is permanent, just touch refcount */ 2651 if (ifp->if_flags & pflag) { 2652 *refcount += onswitch ? 1 : -1; 2653 return (0); 2654 } 2655 2656 /* Save ifnet parameters for if_ioctl() may fail */ 2657 oldcount = *refcount; 2658 oldflags = ifp->if_flags; 2659 2660 /* 2661 * See if we aren't the only and touching refcount is enough. 2662 * Actually toggle interface flag if we are the first or last. 2663 */ 2664 if (onswitch) { 2665 if ((*refcount)++) 2666 return (0); 2667 ifp->if_flags |= flag; 2668 } else { 2669 if (--(*refcount)) 2670 return (0); 2671 ifp->if_flags &= ~flag; 2672 } 2673 2674 /* Call down the driver since we've changed interface flags */ 2675 if (ifp->if_ioctl == NULL) { 2676 error = EOPNOTSUPP; 2677 goto recover; 2678 } 2679 ifr.ifr_flags = ifp->if_flags & 0xffff; 2680 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2681 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2682 if (error) 2683 goto recover; 2684 /* Notify userland that interface flags have changed */ 2685 rt_ifmsg(ifp); 2686 return (0); 2687 2688recover: 2689 /* Recover after driver error */ 2690 *refcount = oldcount; 2691 ifp->if_flags = oldflags; 2692 return (error); 2693} 2694 2695/* 2696 * Set/clear promiscuous mode on interface ifp based on the truth value 2697 * of pswitch. The calls are reference counted so that only the first 2698 * "on" request actually has an effect, as does the final "off" request. 2699 * Results are undefined if the "off" and "on" requests are not matched. 2700 */ 2701int 2702ifpromisc(struct ifnet *ifp, int pswitch) 2703{ 2704 int error; 2705 int oldflags = ifp->if_flags; 2706 2707 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2708 &ifp->if_pcount, pswitch); 2709 /* If promiscuous mode status has changed, log a message */ 2710 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2711 log(LOG_INFO, "%s: promiscuous mode %s\n", 2712 ifp->if_xname, 2713 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2714 return (error); 2715} 2716 2717/* 2718 * Return interface configuration 2719 * of system. List may be used 2720 * in later ioctl's (above) to get 2721 * other information. 2722 */ 2723/*ARGSUSED*/ 2724static int 2725ifconf(u_long cmd, caddr_t data) 2726{ 2727 struct ifconf *ifc = (struct ifconf *)data; 2728 struct ifnet *ifp; 2729 struct ifaddr *ifa; 2730 struct ifreq ifr; 2731 struct sbuf *sb; 2732 int error, full = 0, valid_len, max_len; 2733 2734 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2735 max_len = MAXPHYS - 1; 2736 2737 /* Prevent hostile input from being able to crash the system */ 2738 if (ifc->ifc_len <= 0) 2739 return (EINVAL); 2740 2741again: 2742 if (ifc->ifc_len <= max_len) { 2743 max_len = ifc->ifc_len; 2744 full = 1; 2745 } 2746 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2747 max_len = 0; 2748 valid_len = 0; 2749 2750 IFNET_RLOCK(); 2751 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2752 int addrs; 2753 2754 /* 2755 * Zero the ifr_name buffer to make sure we don't 2756 * disclose the contents of the stack. 2757 */ 2758 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2759 2760 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2761 >= sizeof(ifr.ifr_name)) { 2762 sbuf_delete(sb); 2763 IFNET_RUNLOCK(); 2764 return (ENAMETOOLONG); 2765 } 2766 2767 addrs = 0; 2768 IF_ADDR_RLOCK(ifp); 2769 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2770 struct sockaddr *sa = ifa->ifa_addr; 2771 2772 if (prison_if(curthread->td_ucred, sa) != 0) 2773 continue; 2774 addrs++; 2775#ifdef COMPAT_43 2776 if (cmd == OSIOCGIFCONF) { 2777 struct osockaddr *osa = 2778 (struct osockaddr *)&ifr.ifr_addr; 2779 ifr.ifr_addr = *sa; 2780 osa->sa_family = sa->sa_family; 2781 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2782 max_len += sizeof(ifr); 2783 } else 2784#endif 2785 if (sa->sa_len <= sizeof(*sa)) { 2786 ifr.ifr_addr = *sa; 2787 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2788 max_len += sizeof(ifr); 2789 } else { 2790 sbuf_bcat(sb, &ifr, 2791 offsetof(struct ifreq, ifr_addr)); 2792 max_len += offsetof(struct ifreq, ifr_addr); 2793 sbuf_bcat(sb, sa, sa->sa_len); 2794 max_len += sa->sa_len; 2795 } 2796 2797 if (sbuf_error(sb) == 0) 2798 valid_len = sbuf_len(sb); 2799 } 2800 IF_ADDR_RUNLOCK(ifp); 2801 if (addrs == 0) { 2802 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2803 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2804 max_len += sizeof(ifr); 2805 2806 if (sbuf_error(sb) == 0) 2807 valid_len = sbuf_len(sb); 2808 } 2809 } 2810 IFNET_RUNLOCK(); 2811 2812 /* 2813 * If we didn't allocate enough space (uncommon), try again. If 2814 * we have already allocated as much space as we are allowed, 2815 * return what we've got. 2816 */ 2817 if (valid_len != max_len && !full) { 2818 sbuf_delete(sb); 2819 goto again; 2820 } 2821 2822 ifc->ifc_len = valid_len; 2823 sbuf_finish(sb); 2824 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2825 sbuf_delete(sb); 2826 return (error); 2827} 2828 2829/* 2830 * Just like ifpromisc(), but for all-multicast-reception mode. 2831 */ 2832int 2833if_allmulti(struct ifnet *ifp, int onswitch) 2834{ 2835 2836 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2837} 2838 2839struct ifmultiaddr * 2840if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2841{ 2842 struct ifmultiaddr *ifma; 2843 2844 IF_ADDR_LOCK_ASSERT(ifp); 2845 2846 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2847 if (sa->sa_family == AF_LINK) { 2848 if (sa_dl_equal(ifma->ifma_addr, sa)) 2849 break; 2850 } else { 2851 if (sa_equal(ifma->ifma_addr, sa)) 2852 break; 2853 } 2854 } 2855 2856 return ifma; 2857} 2858 2859/* 2860 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2861 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2862 * the ifnet multicast address list here, so the caller must do that and 2863 * other setup work (such as notifying the device driver). The reference 2864 * count is initialized to 1. 2865 */ 2866static struct ifmultiaddr * 2867if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2868 int mflags) 2869{ 2870 struct ifmultiaddr *ifma; 2871 struct sockaddr *dupsa; 2872 2873 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2874 M_ZERO); 2875 if (ifma == NULL) 2876 return (NULL); 2877 2878 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2879 if (dupsa == NULL) { 2880 free(ifma, M_IFMADDR); 2881 return (NULL); 2882 } 2883 bcopy(sa, dupsa, sa->sa_len); 2884 ifma->ifma_addr = dupsa; 2885 2886 ifma->ifma_ifp = ifp; 2887 ifma->ifma_refcount = 1; 2888 ifma->ifma_protospec = NULL; 2889 2890 if (llsa == NULL) { 2891 ifma->ifma_lladdr = NULL; 2892 return (ifma); 2893 } 2894 2895 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2896 if (dupsa == NULL) { 2897 free(ifma->ifma_addr, M_IFMADDR); 2898 free(ifma, M_IFMADDR); 2899 return (NULL); 2900 } 2901 bcopy(llsa, dupsa, llsa->sa_len); 2902 ifma->ifma_lladdr = dupsa; 2903 2904 return (ifma); 2905} 2906 2907/* 2908 * if_freemulti: free ifmultiaddr structure and possibly attached related 2909 * addresses. The caller is responsible for implementing reference 2910 * counting, notifying the driver, handling routing messages, and releasing 2911 * any dependent link layer state. 2912 */ 2913static void 2914if_freemulti(struct ifmultiaddr *ifma) 2915{ 2916 2917 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2918 ifma->ifma_refcount)); 2919 KASSERT(ifma->ifma_protospec == NULL, 2920 ("if_freemulti: protospec not NULL")); 2921 2922 if (ifma->ifma_lladdr != NULL) 2923 free(ifma->ifma_lladdr, M_IFMADDR); 2924 free(ifma->ifma_addr, M_IFMADDR); 2925 free(ifma, M_IFMADDR); 2926} 2927 2928/* 2929 * Register an additional multicast address with a network interface. 2930 * 2931 * - If the address is already present, bump the reference count on the 2932 * address and return. 2933 * - If the address is not link-layer, look up a link layer address. 2934 * - Allocate address structures for one or both addresses, and attach to the 2935 * multicast address list on the interface. If automatically adding a link 2936 * layer address, the protocol address will own a reference to the link 2937 * layer address, to be freed when it is freed. 2938 * - Notify the network device driver of an addition to the multicast address 2939 * list. 2940 * 2941 * 'sa' points to caller-owned memory with the desired multicast address. 2942 * 2943 * 'retifma' will be used to return a pointer to the resulting multicast 2944 * address reference, if desired. 2945 */ 2946int 2947if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2948 struct ifmultiaddr **retifma) 2949{ 2950 struct ifmultiaddr *ifma, *ll_ifma; 2951 struct sockaddr *llsa; 2952 int error; 2953 2954 /* 2955 * If the address is already present, return a new reference to it; 2956 * otherwise, allocate storage and set up a new address. 2957 */ 2958 IF_ADDR_WLOCK(ifp); 2959 ifma = if_findmulti(ifp, sa); 2960 if (ifma != NULL) { 2961 ifma->ifma_refcount++; 2962 if (retifma != NULL) 2963 *retifma = ifma; 2964 IF_ADDR_WUNLOCK(ifp); 2965 return (0); 2966 } 2967 2968 /* 2969 * The address isn't already present; resolve the protocol address 2970 * into a link layer address, and then look that up, bump its 2971 * refcount or allocate an ifma for that also. If 'llsa' was 2972 * returned, we will need to free it later. 2973 */ 2974 llsa = NULL; 2975 ll_ifma = NULL; 2976 if (ifp->if_resolvemulti != NULL) { 2977 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2978 if (error) 2979 goto unlock_out; 2980 } 2981 2982 /* 2983 * Allocate the new address. Don't hook it up yet, as we may also 2984 * need to allocate a link layer multicast address. 2985 */ 2986 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2987 if (ifma == NULL) { 2988 error = ENOMEM; 2989 goto free_llsa_out; 2990 } 2991 2992 /* 2993 * If a link layer address is found, we'll need to see if it's 2994 * already present in the address list, or allocate is as well. 2995 * When this block finishes, the link layer address will be on the 2996 * list. 2997 */ 2998 if (llsa != NULL) { 2999 ll_ifma = if_findmulti(ifp, llsa); 3000 if (ll_ifma == NULL) { 3001 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3002 if (ll_ifma == NULL) { 3003 --ifma->ifma_refcount; 3004 if_freemulti(ifma); 3005 error = ENOMEM; 3006 goto free_llsa_out; 3007 } 3008 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3009 ifma_link); 3010 } else 3011 ll_ifma->ifma_refcount++; 3012 ifma->ifma_llifma = ll_ifma; 3013 } 3014 3015 /* 3016 * We now have a new multicast address, ifma, and possibly a new or 3017 * referenced link layer address. Add the primary address to the 3018 * ifnet address list. 3019 */ 3020 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3021 3022 if (retifma != NULL) 3023 *retifma = ifma; 3024 3025 /* 3026 * Must generate the message while holding the lock so that 'ifma' 3027 * pointer is still valid. 3028 */ 3029 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3030 IF_ADDR_WUNLOCK(ifp); 3031 3032 /* 3033 * We are certain we have added something, so call down to the 3034 * interface to let them know about it. 3035 */ 3036 if (ifp->if_ioctl != NULL) { 3037 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3038 } 3039 3040 if (llsa != NULL) 3041 free(llsa, M_IFMADDR); 3042 3043 return (0); 3044 3045free_llsa_out: 3046 if (llsa != NULL) 3047 free(llsa, M_IFMADDR); 3048 3049unlock_out: 3050 IF_ADDR_WUNLOCK(ifp); 3051 return (error); 3052} 3053 3054/* 3055 * Delete a multicast group membership by network-layer group address. 3056 * 3057 * Returns ENOENT if the entry could not be found. If ifp no longer 3058 * exists, results are undefined. This entry point should only be used 3059 * from subsystems which do appropriate locking to hold ifp for the 3060 * duration of the call. 3061 * Network-layer protocol domains must use if_delmulti_ifma(). 3062 */ 3063int 3064if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3065{ 3066 struct ifmultiaddr *ifma; 3067 int lastref; 3068#ifdef INVARIANTS 3069 struct ifnet *oifp; 3070 3071 IFNET_RLOCK_NOSLEEP(); 3072 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3073 if (ifp == oifp) 3074 break; 3075 if (ifp != oifp) 3076 ifp = NULL; 3077 IFNET_RUNLOCK_NOSLEEP(); 3078 3079 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3080#endif 3081 if (ifp == NULL) 3082 return (ENOENT); 3083 3084 IF_ADDR_WLOCK(ifp); 3085 lastref = 0; 3086 ifma = if_findmulti(ifp, sa); 3087 if (ifma != NULL) 3088 lastref = if_delmulti_locked(ifp, ifma, 0); 3089 IF_ADDR_WUNLOCK(ifp); 3090 3091 if (ifma == NULL) 3092 return (ENOENT); 3093 3094 if (lastref && ifp->if_ioctl != NULL) { 3095 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3096 } 3097 3098 return (0); 3099} 3100 3101/* 3102 * Delete all multicast group membership for an interface. 3103 * Should be used to quickly flush all multicast filters. 3104 */ 3105void 3106if_delallmulti(struct ifnet *ifp) 3107{ 3108 struct ifmultiaddr *ifma; 3109 struct ifmultiaddr *next; 3110 3111 IF_ADDR_WLOCK(ifp); 3112 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3113 if_delmulti_locked(ifp, ifma, 0); 3114 IF_ADDR_WUNLOCK(ifp); 3115} 3116 3117/* 3118 * Delete a multicast group membership by group membership pointer. 3119 * Network-layer protocol domains must use this routine. 3120 * 3121 * It is safe to call this routine if the ifp disappeared. 3122 */ 3123void 3124if_delmulti_ifma(struct ifmultiaddr *ifma) 3125{ 3126 struct ifnet *ifp; 3127 int lastref; 3128 3129 ifp = ifma->ifma_ifp; 3130#ifdef DIAGNOSTIC 3131 if (ifp == NULL) { 3132 printf("%s: ifma_ifp seems to be detached\n", __func__); 3133 } else { 3134 struct ifnet *oifp; 3135 3136 IFNET_RLOCK_NOSLEEP(); 3137 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3138 if (ifp == oifp) 3139 break; 3140 if (ifp != oifp) { 3141 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3142 ifp = NULL; 3143 } 3144 IFNET_RUNLOCK_NOSLEEP(); 3145 } 3146#endif 3147 /* 3148 * If and only if the ifnet instance exists: Acquire the address lock. 3149 */ 3150 if (ifp != NULL) 3151 IF_ADDR_WLOCK(ifp); 3152 3153 lastref = if_delmulti_locked(ifp, ifma, 0); 3154 3155 if (ifp != NULL) { 3156 /* 3157 * If and only if the ifnet instance exists: 3158 * Release the address lock. 3159 * If the group was left: update the hardware hash filter. 3160 */ 3161 IF_ADDR_WUNLOCK(ifp); 3162 if (lastref && ifp->if_ioctl != NULL) { 3163 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3164 } 3165 } 3166} 3167 3168/* 3169 * Perform deletion of network-layer and/or link-layer multicast address. 3170 * 3171 * Return 0 if the reference count was decremented. 3172 * Return 1 if the final reference was released, indicating that the 3173 * hardware hash filter should be reprogrammed. 3174 */ 3175static int 3176if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3177{ 3178 struct ifmultiaddr *ll_ifma; 3179 3180 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3181 KASSERT(ifma->ifma_ifp == ifp, 3182 ("%s: inconsistent ifp %p", __func__, ifp)); 3183 IF_ADDR_WLOCK_ASSERT(ifp); 3184 } 3185 3186 ifp = ifma->ifma_ifp; 3187 3188 /* 3189 * If the ifnet is detaching, null out references to ifnet, 3190 * so that upper protocol layers will notice, and not attempt 3191 * to obtain locks for an ifnet which no longer exists. The 3192 * routing socket announcement must happen before the ifnet 3193 * instance is detached from the system. 3194 */ 3195 if (detaching) { 3196#ifdef DIAGNOSTIC 3197 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3198#endif 3199 /* 3200 * ifp may already be nulled out if we are being reentered 3201 * to delete the ll_ifma. 3202 */ 3203 if (ifp != NULL) { 3204 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3205 ifma->ifma_ifp = NULL; 3206 } 3207 } 3208 3209 if (--ifma->ifma_refcount > 0) 3210 return 0; 3211 3212 /* 3213 * If this ifma is a network-layer ifma, a link-layer ifma may 3214 * have been associated with it. Release it first if so. 3215 */ 3216 ll_ifma = ifma->ifma_llifma; 3217 if (ll_ifma != NULL) { 3218 KASSERT(ifma->ifma_lladdr != NULL, 3219 ("%s: llifma w/o lladdr", __func__)); 3220 if (detaching) 3221 ll_ifma->ifma_ifp = NULL; /* XXX */ 3222 if (--ll_ifma->ifma_refcount == 0) { 3223 if (ifp != NULL) { 3224 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3225 ifma_link); 3226 } 3227 if_freemulti(ll_ifma); 3228 } 3229 } 3230 3231 if (ifp != NULL) 3232 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3233 3234 if_freemulti(ifma); 3235 3236 /* 3237 * The last reference to this instance of struct ifmultiaddr 3238 * was released; the hardware should be notified of this change. 3239 */ 3240 return 1; 3241} 3242 3243/* 3244 * Set the link layer address on an interface. 3245 * 3246 * At this time we only support certain types of interfaces, 3247 * and we don't allow the length of the address to change. 3248 */ 3249int 3250if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3251{ 3252 struct sockaddr_dl *sdl; 3253 struct ifaddr *ifa; 3254 struct ifreq ifr; 3255 3256 IF_ADDR_RLOCK(ifp); 3257 ifa = ifp->if_addr; 3258 if (ifa == NULL) { 3259 IF_ADDR_RUNLOCK(ifp); 3260 return (EINVAL); 3261 } 3262 ifa_ref(ifa); 3263 IF_ADDR_RUNLOCK(ifp); 3264 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3265 if (sdl == NULL) { 3266 ifa_free(ifa); 3267 return (EINVAL); 3268 } 3269 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3270 ifa_free(ifa); 3271 return (EINVAL); 3272 } 3273 switch (ifp->if_type) { 3274 case IFT_ETHER: 3275 case IFT_FDDI: 3276 case IFT_XETHER: 3277 case IFT_ISO88025: 3278 case IFT_L2VLAN: 3279 case IFT_BRIDGE: 3280 case IFT_ARCNET: 3281 case IFT_IEEE8023ADLAG: 3282 case IFT_IEEE80211: 3283 bcopy(lladdr, LLADDR(sdl), len); 3284 ifa_free(ifa); 3285 break; 3286 default: 3287 ifa_free(ifa); 3288 return (ENODEV); 3289 } 3290 3291 /* 3292 * If the interface is already up, we need 3293 * to re-init it in order to reprogram its 3294 * address filter. 3295 */ 3296 if ((ifp->if_flags & IFF_UP) != 0) { 3297 if (ifp->if_ioctl) { 3298 ifp->if_flags &= ~IFF_UP; 3299 ifr.ifr_flags = ifp->if_flags & 0xffff; 3300 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3301 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3302 ifp->if_flags |= IFF_UP; 3303 ifr.ifr_flags = ifp->if_flags & 0xffff; 3304 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3305 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3306 } 3307#ifdef INET 3308 /* 3309 * Also send gratuitous ARPs to notify other nodes about 3310 * the address change. 3311 */ 3312 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3313 if (ifa->ifa_addr->sa_family == AF_INET) 3314 arp_ifinit(ifp, ifa); 3315 } 3316#endif 3317 } 3318 return (0); 3319} 3320 3321/* 3322 * The name argument must be a pointer to storage which will last as 3323 * long as the interface does. For physical devices, the result of 3324 * device_get_name(dev) is a good choice and for pseudo-devices a 3325 * static string works well. 3326 */ 3327void 3328if_initname(struct ifnet *ifp, const char *name, int unit) 3329{ 3330 ifp->if_dname = name; 3331 ifp->if_dunit = unit; 3332 if (unit != IF_DUNIT_NONE) 3333 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3334 else 3335 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3336} 3337 3338int 3339if_printf(struct ifnet *ifp, const char * fmt, ...) 3340{ 3341 va_list ap; 3342 int retval; 3343 3344 retval = printf("%s: ", ifp->if_xname); 3345 va_start(ap, fmt); 3346 retval += vprintf(fmt, ap); 3347 va_end(ap); 3348 return (retval); 3349} 3350 3351void 3352if_start(struct ifnet *ifp) 3353{ 3354 3355 (*(ifp)->if_start)(ifp); 3356} 3357 3358/* 3359 * Backwards compatibility interface for drivers 3360 * that have not implemented it 3361 */ 3362static int 3363if_transmit(struct ifnet *ifp, struct mbuf *m) 3364{ 3365 int error; 3366 3367 IFQ_HANDOFF(ifp, m, error); 3368 return (error); 3369} 3370 3371int 3372if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3373{ 3374 int active = 0; 3375 3376 IF_LOCK(ifq); 3377 if (_IF_QFULL(ifq)) { 3378 _IF_DROP(ifq); 3379 IF_UNLOCK(ifq); 3380 m_freem(m); 3381 return (0); 3382 } 3383 if (ifp != NULL) { 3384 ifp->if_obytes += m->m_pkthdr.len + adjust; 3385 if (m->m_flags & (M_BCAST|M_MCAST)) 3386 ifp->if_omcasts++; 3387 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3388 } 3389 _IF_ENQUEUE(ifq, m); 3390 IF_UNLOCK(ifq); 3391 if (ifp != NULL && !active) 3392 (*(ifp)->if_start)(ifp); 3393 return (1); 3394} 3395 3396void 3397if_register_com_alloc(u_char type, 3398 if_com_alloc_t *a, if_com_free_t *f) 3399{ 3400 3401 KASSERT(if_com_alloc[type] == NULL, 3402 ("if_register_com_alloc: %d already registered", type)); 3403 KASSERT(if_com_free[type] == NULL, 3404 ("if_register_com_alloc: %d free already registered", type)); 3405 3406 if_com_alloc[type] = a; 3407 if_com_free[type] = f; 3408} 3409 3410void 3411if_deregister_com_alloc(u_char type) 3412{ 3413 3414 KASSERT(if_com_alloc[type] != NULL, 3415 ("if_deregister_com_alloc: %d not registered", type)); 3416 KASSERT(if_com_free[type] != NULL, 3417 ("if_deregister_com_alloc: %d free not registered", type)); 3418 if_com_alloc[type] = NULL; 3419 if_com_free[type] = NULL; 3420} 3421