if.c revision 194622
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: head/sys/net/if.c 194622 2009-06-22 10:59:34Z rwatson $ 31 */ 32 33#include "opt_compat.h" 34#include "opt_inet6.h" 35#include "opt_inet.h" 36#include "opt_carp.h" 37 38#include <sys/param.h> 39#include <sys/types.h> 40#include <sys/conf.h> 41#include <sys/malloc.h> 42#include <sys/sbuf.h> 43#include <sys/bus.h> 44#include <sys/mbuf.h> 45#include <sys/systm.h> 46#include <sys/priv.h> 47#include <sys/proc.h> 48#include <sys/socket.h> 49#include <sys/socketvar.h> 50#include <sys/protosw.h> 51#include <sys/kernel.h> 52#include <sys/lock.h> 53#include <sys/refcount.h> 54#include <sys/module.h> 55#include <sys/rwlock.h> 56#include <sys/sockio.h> 57#include <sys/syslog.h> 58#include <sys/sysctl.h> 59#include <sys/taskqueue.h> 60#include <sys/domain.h> 61#include <sys/jail.h> 62#include <sys/vimage.h> 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#ifdef INET6 81#include <netinet6/in6_var.h> 82#include <netinet6/in6_ifattach.h> 83#endif 84#endif 85#ifdef INET 86#include <netinet/if_ether.h> 87#include <netinet/vinet.h> 88#endif 89#if defined(INET) || defined(INET6) 90#ifdef DEV_CARP 91#include <netinet/ip_carp.h> 92#endif 93#endif 94 95#include <security/mac/mac_framework.h> 96 97#ifndef VIMAGE 98#ifndef VIMAGE_GLOBALS 99struct vnet_net vnet_net_0; 100#endif 101#endif 102 103static int slowtimo_started; 104 105SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 106SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 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 115void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 116void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 117void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 118 119struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 120 121/* 122 * XXX: Style; these should be sorted alphabetically, and unprototyped 123 * static functions should be prototyped. Currently they are sorted by 124 * declaration order. 125 */ 126static void if_attachdomain(void *); 127static void if_attachdomain1(struct ifnet *); 128static int ifconf(u_long, caddr_t); 129static void if_freemulti(struct ifmultiaddr *); 130static void if_init(void *); 131static void if_check(void *); 132static void if_route(struct ifnet *, int flag, int fam); 133static int if_setflag(struct ifnet *, int, int, int *, int); 134static void if_slowtimo(void *); 135static int if_transmit(struct ifnet *ifp, struct mbuf *m); 136static void if_unroute(struct ifnet *, int flag, int fam); 137static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 138static int if_rtdel(struct radix_node *, void *); 139static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 140static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 141static void do_link_state_change(void *, int); 142static int if_getgroup(struct ifgroupreq *, struct ifnet *); 143static int if_getgroupmembers(struct ifgroupreq *); 144static void if_delgroups(struct ifnet *); 145static void if_attach_internal(struct ifnet *, int); 146static void if_detach_internal(struct ifnet *, int); 147 148#ifdef INET6 149/* 150 * XXX: declare here to avoid to include many inet6 related files.. 151 * should be more generalized? 152 */ 153extern void nd6_setmtu(struct ifnet *); 154#endif 155 156static int vnet_net_iattach(const void *); 157#ifdef VIMAGE 158static int vnet_net_idetach(const void *); 159#endif 160 161#ifdef VIMAGE_GLOBALS 162struct ifnethead ifnet; /* depend on static init XXX */ 163struct ifgrouphead ifg_head; 164int if_index; 165static int if_indexlim; 166/* Table of ifnet/cdev by index. Locked with ifnet_lock. */ 167static struct ifindex_entry *ifindex_table; 168static struct knlist ifklist; 169#endif 170 171int ifqmaxlen = IFQ_MAXLEN; 172struct rwlock ifnet_lock; 173static if_com_alloc_t *if_com_alloc[256]; 174static if_com_free_t *if_com_free[256]; 175 176static void filt_netdetach(struct knote *kn); 177static int filt_netdev(struct knote *kn, long hint); 178 179static struct filterops netdev_filtops = 180 { 1, NULL, filt_netdetach, filt_netdev }; 181 182#ifndef VIMAGE_GLOBALS 183static struct vnet_symmap vnet_net_symmap[] = { 184 VNET_SYMMAP(net, ifnet), 185 VNET_SYMMAP(net, rt_tables), 186 VNET_SYMMAP(net, rtstat), 187 VNET_SYMMAP(net, rttrash), 188 VNET_SYMMAP_END 189}; 190 191static const vnet_modinfo_t vnet_net_modinfo = { 192 .vmi_id = VNET_MOD_NET, 193 .vmi_name = "net", 194 .vmi_size = sizeof(struct vnet_net), 195 .vmi_symmap = vnet_net_symmap, 196 .vmi_iattach = vnet_net_iattach, 197#ifdef VIMAGE 198 .vmi_idetach = vnet_net_idetach 199#endif 200}; 201#endif /* !VIMAGE_GLOBALS */ 202 203/* 204 * System initialization 205 */ 206SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 207SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL); 208 209MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 210MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 211MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 212 213struct ifnet * 214ifnet_byindex_locked(u_short idx) 215{ 216 INIT_VNET_NET(curvnet); 217 218 if (idx > V_if_index) 219 return (NULL); 220 return (V_ifindex_table[idx].ife_ifnet); 221} 222 223struct ifnet * 224ifnet_byindex(u_short idx) 225{ 226 struct ifnet *ifp; 227 228 IFNET_RLOCK(); 229 ifp = ifnet_byindex_locked(idx); 230 IFNET_RUNLOCK(); 231 return (ifp); 232} 233 234struct ifnet * 235ifnet_byindex_ref(u_short idx) 236{ 237 struct ifnet *ifp; 238 239 IFNET_RLOCK(); 240 ifp = ifnet_byindex_locked(idx); 241 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 242 IFNET_RUNLOCK(); 243 return (NULL); 244 } 245 if_ref(ifp); 246 IFNET_RUNLOCK(); 247 return (ifp); 248} 249 250static void 251ifnet_setbyindex(u_short idx, struct ifnet *ifp) 252{ 253 INIT_VNET_NET(curvnet); 254 255 IFNET_WLOCK_ASSERT(); 256 257 V_ifindex_table[idx].ife_ifnet = ifp; 258} 259 260struct ifaddr * 261ifaddr_byindex(u_short idx) 262{ 263 struct ifaddr *ifa; 264 265 IFNET_RLOCK(); 266 ifa = ifnet_byindex_locked(idx)->if_addr; 267 IFNET_RUNLOCK(); 268 return (ifa); 269} 270 271struct cdev * 272ifdev_byindex(u_short idx) 273{ 274 INIT_VNET_NET(curvnet); 275 struct cdev *cdev; 276 277 IFNET_RLOCK(); 278 cdev = V_ifindex_table[idx].ife_dev; 279 IFNET_RUNLOCK(); 280 return (cdev); 281} 282 283static void 284ifdev_setbyindex(u_short idx, struct cdev *cdev) 285{ 286 INIT_VNET_NET(curvnet); 287 288 IFNET_WLOCK(); 289 V_ifindex_table[idx].ife_dev = cdev; 290 IFNET_WUNLOCK(); 291} 292 293static d_open_t netopen; 294static d_close_t netclose; 295static d_ioctl_t netioctl; 296static d_kqfilter_t netkqfilter; 297 298static struct cdevsw net_cdevsw = { 299 .d_version = D_VERSION, 300 .d_flags = D_NEEDGIANT, 301 .d_open = netopen, 302 .d_close = netclose, 303 .d_ioctl = netioctl, 304 .d_name = "net", 305 .d_kqfilter = netkqfilter, 306}; 307 308static int 309netopen(struct cdev *dev, int flag, int mode, struct thread *td) 310{ 311 return (0); 312} 313 314static int 315netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 316{ 317 return (0); 318} 319 320static int 321netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 322{ 323 struct ifnet *ifp; 324 int error, idx; 325 326 /* only support interface specific ioctls */ 327 if (IOCGROUP(cmd) != 'i') 328 return (EOPNOTSUPP); 329 idx = dev2unit(dev); 330 if (idx == 0) { 331 /* 332 * special network device, not interface. 333 */ 334 if (cmd == SIOCGIFCONF) 335 return (ifconf(cmd, data)); /* XXX remove cmd */ 336#ifdef __amd64__ 337 if (cmd == SIOCGIFCONF32) 338 return (ifconf(cmd, data)); /* XXX remove cmd */ 339#endif 340 return (EOPNOTSUPP); 341 } 342 343 ifp = ifnet_byindex(idx); 344 if (ifp == NULL) 345 return (ENXIO); 346 347 error = ifhwioctl(cmd, ifp, data, td); 348 if (error == ENOIOCTL) 349 error = EOPNOTSUPP; 350 return (error); 351} 352 353static int 354netkqfilter(struct cdev *dev, struct knote *kn) 355{ 356 INIT_VNET_NET(curvnet); 357 struct knlist *klist; 358 struct ifnet *ifp; 359 int idx; 360 361 switch (kn->kn_filter) { 362 case EVFILT_NETDEV: 363 kn->kn_fop = &netdev_filtops; 364 break; 365 default: 366 return (EINVAL); 367 } 368 369 idx = dev2unit(dev); 370 if (idx == 0) { 371 klist = &V_ifklist; 372 } else { 373 ifp = ifnet_byindex(idx); 374 if (ifp == NULL) 375 return (1); 376 klist = &ifp->if_klist; 377 } 378 379 kn->kn_hook = (caddr_t)klist; 380 381 knlist_add(klist, kn, 0); 382 383 return (0); 384} 385 386static void 387filt_netdetach(struct knote *kn) 388{ 389 struct knlist *klist = (struct knlist *)kn->kn_hook; 390 391 knlist_remove(klist, kn, 0); 392} 393 394static int 395filt_netdev(struct knote *kn, long hint) 396{ 397 struct knlist *klist = (struct knlist *)kn->kn_hook; 398 399 /* 400 * Currently NOTE_EXIT is abused to indicate device detach. 401 */ 402 if (hint == NOTE_EXIT) { 403 kn->kn_data = NOTE_LINKINV; 404 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 405 knlist_remove_inevent(klist, kn); 406 return (1); 407 } 408 if (hint != 0) 409 kn->kn_data = hint; /* current status */ 410 if (kn->kn_sfflags & hint) 411 kn->kn_fflags |= hint; 412 return (kn->kn_fflags != 0); 413} 414 415/* 416 * Network interface utility routines. 417 * 418 * Routines with ifa_ifwith* names take sockaddr *'s as 419 * parameters. 420 */ 421 422/* ARGSUSED*/ 423static void 424if_init(void *dummy __unused) 425{ 426 427#ifndef VIMAGE_GLOBALS 428 vnet_mod_register(&vnet_net_modinfo); 429#else 430 vnet_net_iattach(NULL); 431#endif 432 433 IFNET_LOCK_INIT(); 434 ifdev_setbyindex(0, make_dev(&net_cdevsw, 0, UID_ROOT, GID_WHEEL, 435 0600, "network")); 436 if_clone_init(); 437} 438 439static int 440vnet_net_iattach(const void *unused __unused) 441{ 442 INIT_VNET_NET(curvnet); 443 444 V_if_index = 0; 445 V_ifindex_table = NULL; 446 V_if_indexlim = 8; 447 448 TAILQ_INIT(&V_ifnet); 449 TAILQ_INIT(&V_ifg_head); 450 knlist_init_mtx(&V_ifklist, NULL); 451 if_grow(); /* create initial table */ 452 453 return (0); 454} 455 456#ifdef VIMAGE 457static int 458vnet_net_idetach(const void *unused __unused) 459{ 460 INIT_VNET_NET(curvnet); 461 462 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet)); 463 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head)); 464 VNET_ASSERT(SLIST_EMPTY(&V_ifklist.kl_list)); 465 466 free((caddr_t)V_ifindex_table, M_IFNET); 467 468 return (0); 469} 470#endif 471 472void 473if_grow(void) 474{ 475 INIT_VNET_NET(curvnet); 476 u_int n; 477 struct ifindex_entry *e; 478 479 V_if_indexlim <<= 1; 480 n = V_if_indexlim * sizeof(*e); 481 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 482 if (V_ifindex_table != NULL) { 483 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 484 free((caddr_t)V_ifindex_table, M_IFNET); 485 } 486 V_ifindex_table = e; 487} 488 489static void 490if_check(void *dummy __unused) 491{ 492 493 /* 494 * If at least one interface added during boot uses 495 * if_watchdog then start the timer. 496 */ 497 if (slowtimo_started) 498 if_slowtimo(0); 499} 500 501/* 502 * Allocate a struct ifnet and an index for an interface. A layer 2 503 * common structure will also be allocated if an allocation routine is 504 * registered for the passed type. 505 */ 506struct ifnet * 507if_alloc(u_char type) 508{ 509 INIT_VNET_NET(curvnet); 510 struct ifnet *ifp; 511 512 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 513 514 /* 515 * Try to find an empty slot below if_index. If we fail, take 516 * the next slot. 517 * 518 * XXX: should be locked! 519 */ 520 for (ifp->if_index = 1; ifp->if_index <= V_if_index; ifp->if_index++) { 521 if (ifnet_byindex(ifp->if_index) == NULL) 522 break; 523 } 524 /* Catch if_index overflow. */ 525 if (ifp->if_index < 1) { 526 free(ifp, M_IFNET); 527 return (NULL); 528 } 529 if (ifp->if_index > V_if_index) 530 V_if_index = ifp->if_index; 531 if (V_if_index >= V_if_indexlim) 532 if_grow(); 533 534 ifp->if_type = type; 535 ifp->if_alloctype = type; 536 537 if (if_com_alloc[type] != NULL) { 538 ifp->if_l2com = if_com_alloc[type](type, ifp); 539 if (ifp->if_l2com == NULL) { 540 free(ifp, M_IFNET); 541 return (NULL); 542 } 543 } 544 545 IF_ADDR_LOCK_INIT(ifp); 546 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 547 ifp->if_afdata_initialized = 0; 548 IF_AFDATA_LOCK_INIT(ifp); 549 TAILQ_INIT(&ifp->if_addrhead); 550 TAILQ_INIT(&ifp->if_prefixhead); 551 TAILQ_INIT(&ifp->if_multiaddrs); 552 TAILQ_INIT(&ifp->if_groups); 553 knlist_init_mtx(&ifp->if_klist, NULL); 554#ifdef MAC 555 mac_ifnet_init(ifp); 556#endif 557 ifq_init(&ifp->if_snd, ifp); 558 559 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 560 IFNET_WLOCK(); 561 ifnet_setbyindex(ifp->if_index, ifp); 562 IFNET_WUNLOCK(); 563 return (ifp); 564} 565 566/* 567 * Do the actual work of freeing a struct ifnet, associated index, and layer 568 * 2 common structure. This call is made when the last reference to an 569 * interface is released. 570 */ 571static void 572if_free_internal(struct ifnet *ifp) 573{ 574 INIT_VNET_NET(curvnet); /* ifp->if_vnet is already NULL here */ 575 576 KASSERT((ifp->if_flags & IFF_DYING), 577 ("if_free_internal: interface not dying")); 578 579 IFNET_WLOCK(); 580 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 581 ("%s: freeing unallocated ifnet", ifp->if_xname)); 582 583 ifnet_setbyindex(ifp->if_index, NULL); 584 while (V_if_index > 0 && ifnet_byindex_locked(V_if_index) == NULL) 585 V_if_index--; 586 IFNET_WUNLOCK(); 587 588 if (if_com_free[ifp->if_alloctype] != NULL) 589 if_com_free[ifp->if_alloctype](ifp->if_l2com, 590 ifp->if_alloctype); 591 592#ifdef MAC 593 mac_ifnet_destroy(ifp); 594#endif /* MAC */ 595 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 596 knlist_clear(&ifp->if_klist, 0); 597 knlist_destroy(&ifp->if_klist); 598 IF_AFDATA_DESTROY(ifp); 599 IF_ADDR_LOCK_DESTROY(ifp); 600 ifq_delete(&ifp->if_snd); 601 free(ifp, M_IFNET); 602} 603 604/* 605 * This version should only be called by intefaces that switch their type 606 * after calling if_alloc(). if_free_type() will go away again now that we 607 * have if_alloctype to cache the original allocation type. For now, assert 608 * that they match, since we require that in practice. 609 */ 610void 611if_free_type(struct ifnet *ifp, u_char type) 612{ 613 614 KASSERT(ifp->if_alloctype == type, 615 ("if_free_type: type (%d) != alloctype (%d)", type, 616 ifp->if_alloctype)); 617 618 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 619 if (!refcount_release(&ifp->if_refcount)) 620 return; 621 if_free_internal(ifp); 622} 623 624/* 625 * This is the normal version of if_free(), used by device drivers to free a 626 * detached network interface. The contents of if_free_type() will move into 627 * here when if_free_type() goes away. 628 */ 629void 630if_free(struct ifnet *ifp) 631{ 632 633 if_free_type(ifp, ifp->if_alloctype); 634} 635 636/* 637 * Interfaces to keep an ifnet type-stable despite the possibility of the 638 * driver calling if_free(). If there are additional references, we defer 639 * freeing the underlying data structure. 640 */ 641void 642if_ref(struct ifnet *ifp) 643{ 644 645 /* We don't assert the ifnet list lock here, but arguably should. */ 646 refcount_acquire(&ifp->if_refcount); 647} 648 649void 650if_rele(struct ifnet *ifp) 651{ 652 653 if (!refcount_release(&ifp->if_refcount)) 654 return; 655 if_free_internal(ifp); 656} 657 658void 659ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 660{ 661 662 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 663 664 if (ifq->ifq_maxlen == 0) 665 ifq->ifq_maxlen = ifqmaxlen; 666 667 ifq->altq_type = 0; 668 ifq->altq_disc = NULL; 669 ifq->altq_flags &= ALTQF_CANTCHANGE; 670 ifq->altq_tbr = NULL; 671 ifq->altq_ifp = ifp; 672} 673 674void 675ifq_delete(struct ifaltq *ifq) 676{ 677 mtx_destroy(&ifq->ifq_mtx); 678} 679 680/* 681 * Perform generic interface initalization tasks and attach the interface 682 * to the list of "active" interfaces. If vmove flag is set on entry 683 * to if_attach_internal(), perform only a limited subset of initialization 684 * tasks, given that we are moving from one vnet to another an ifnet which 685 * has already been fully initialized. 686 * 687 * XXX: 688 * - The decision to return void and thus require this function to 689 * succeed is questionable. 690 * - We should probably do more sanity checking. For instance we don't 691 * do anything to insure if_xname is unique or non-empty. 692 */ 693void 694if_attach(struct ifnet *ifp) 695{ 696 697 if_attach_internal(ifp, 0); 698} 699 700static void 701if_attach_internal(struct ifnet *ifp, int vmove) 702{ 703 INIT_VNET_NET(curvnet); 704 unsigned socksize, ifasize; 705 int namelen, masklen; 706 struct sockaddr_dl *sdl; 707 struct ifaddr *ifa; 708 709 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 710 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 711 ifp->if_xname); 712 713#ifdef VIMAGE 714 ifp->if_vnet = curvnet; 715 if (ifp->if_home_vnet == NULL) 716 ifp->if_home_vnet = curvnet; 717#endif 718 719 if_addgroup(ifp, IFG_ALL); 720 721 getmicrotime(&ifp->if_lastchange); 722 ifp->if_data.ifi_epoch = time_uptime; 723 ifp->if_data.ifi_datalen = sizeof(struct if_data); 724 725 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 726 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 727 ("transmit and qflush must both either be set or both be NULL")); 728 if (ifp->if_transmit == NULL) { 729 ifp->if_transmit = if_transmit; 730 ifp->if_qflush = if_qflush; 731 } 732 733 if (!vmove) { 734#ifdef MAC 735 mac_ifnet_create(ifp); 736#endif 737 738 if (IS_DEFAULT_VNET(curvnet)) { 739 ifdev_setbyindex(ifp->if_index, make_dev(&net_cdevsw, 740 ifp->if_index, UID_ROOT, GID_WHEEL, 0600, "%s/%s", 741 net_cdevsw.d_name, ifp->if_xname)); 742 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 743 net_cdevsw.d_name, ifp->if_index); 744 } 745 746 /* 747 * Create a Link Level name for this device. 748 */ 749 namelen = strlen(ifp->if_xname); 750 /* 751 * Always save enough space for any possiable name so we 752 * can do a rename in place later. 753 */ 754 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 755 socksize = masklen + ifp->if_addrlen; 756 if (socksize < sizeof(*sdl)) 757 socksize = sizeof(*sdl); 758 socksize = roundup2(socksize, sizeof(long)); 759 ifasize = sizeof(*ifa) + 2 * socksize; 760 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 761 ifa_init(ifa); 762 sdl = (struct sockaddr_dl *)(ifa + 1); 763 sdl->sdl_len = socksize; 764 sdl->sdl_family = AF_LINK; 765 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 766 sdl->sdl_nlen = namelen; 767 sdl->sdl_index = ifp->if_index; 768 sdl->sdl_type = ifp->if_type; 769 ifp->if_addr = ifa; 770 ifa->ifa_ifp = ifp; 771 ifa->ifa_rtrequest = link_rtrequest; 772 ifa->ifa_addr = (struct sockaddr *)sdl; 773 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 774 ifa->ifa_netmask = (struct sockaddr *)sdl; 775 sdl->sdl_len = masklen; 776 while (namelen != 0) 777 sdl->sdl_data[--namelen] = 0xff; 778 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 779 /* Reliably crash if used uninitialized. */ 780 ifp->if_broadcastaddr = NULL; 781 } 782 783 IFNET_WLOCK(); 784 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 785#ifdef VIMAGE 786 curvnet->ifcnt++; 787#endif 788 IFNET_WUNLOCK(); 789 790 if (domain_init_status >= 2) 791 if_attachdomain1(ifp); 792 793 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 794 if (IS_DEFAULT_VNET(curvnet)) 795 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 796 797 /* Announce the interface. */ 798 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 799 800 if (!vmove && ifp->if_watchdog != NULL) { 801 if_printf(ifp, 802 "WARNING: using obsoleted if_watchdog interface\n"); 803 804 /* 805 * Note that we need if_slowtimo(). If this happens after 806 * boot, then call if_slowtimo() directly. 807 */ 808 if (atomic_cmpset_int(&slowtimo_started, 0, 1) && !cold) 809 if_slowtimo(0); 810 } 811} 812 813static void 814if_attachdomain(void *dummy) 815{ 816 INIT_VNET_NET(curvnet); 817 struct ifnet *ifp; 818 int s; 819 820 s = splnet(); 821 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 822 if_attachdomain1(ifp); 823 splx(s); 824} 825SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 826 if_attachdomain, NULL); 827 828static void 829if_attachdomain1(struct ifnet *ifp) 830{ 831 struct domain *dp; 832 int s; 833 834 s = splnet(); 835 836 /* 837 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 838 * cannot lock ifp->if_afdata initialization, entirely. 839 */ 840 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 841 splx(s); 842 return; 843 } 844 if (ifp->if_afdata_initialized >= domain_init_status) { 845 IF_AFDATA_UNLOCK(ifp); 846 splx(s); 847 printf("if_attachdomain called more than once on %s\n", 848 ifp->if_xname); 849 return; 850 } 851 ifp->if_afdata_initialized = domain_init_status; 852 IF_AFDATA_UNLOCK(ifp); 853 854 /* address family dependent data region */ 855 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 856 for (dp = domains; dp; dp = dp->dom_next) { 857 if (dp->dom_ifattach) 858 ifp->if_afdata[dp->dom_family] = 859 (*dp->dom_ifattach)(ifp); 860 } 861 862 splx(s); 863} 864 865/* 866 * Remove any unicast or broadcast network addresses from an interface. 867 */ 868void 869if_purgeaddrs(struct ifnet *ifp) 870{ 871 struct ifaddr *ifa, *next; 872 873 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 874 if (ifa->ifa_addr->sa_family == AF_LINK) 875 continue; 876#ifdef INET 877 /* XXX: Ugly!! ad hoc just for INET */ 878 if (ifa->ifa_addr->sa_family == AF_INET) { 879 struct ifaliasreq ifr; 880 881 bzero(&ifr, sizeof(ifr)); 882 ifr.ifra_addr = *ifa->ifa_addr; 883 if (ifa->ifa_dstaddr) 884 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 885 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 886 NULL) == 0) 887 continue; 888 } 889#endif /* INET */ 890#ifdef INET6 891 if (ifa->ifa_addr->sa_family == AF_INET6) { 892 in6_purgeaddr(ifa); 893 /* ifp_addrhead is already updated */ 894 continue; 895 } 896#endif /* INET6 */ 897 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 898 ifa_free(ifa); 899 } 900} 901 902/* 903 * Remove any multicast network addresses from an interface. 904 */ 905void 906if_purgemaddrs(struct ifnet *ifp) 907{ 908 struct ifmultiaddr *ifma; 909 struct ifmultiaddr *next; 910 911 IF_ADDR_LOCK(ifp); 912 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 913 if_delmulti_locked(ifp, ifma, 1); 914 IF_ADDR_UNLOCK(ifp); 915} 916 917/* 918 * Detach an interface, removing it from the list of "active" interfaces. 919 * If vmove flag is set on entry to if_detach_internal(), perform only a 920 * limited subset of cleanup tasks, given that we are moving an ifnet from 921 * one vnet to another, where it must be fully operational. 922 * 923 * XXXRW: There are some significant questions about event ordering, and 924 * how to prevent things from starting to use the interface during detach. 925 */ 926void 927if_detach(struct ifnet *ifp) 928{ 929 930 if_detach_internal(ifp, 0); 931} 932 933static void 934if_detach_internal(struct ifnet *ifp, int vmove) 935{ 936 INIT_VNET_NET(ifp->if_vnet); 937 struct ifaddr *ifa; 938 struct radix_node_head *rnh; 939 int i, j; 940 struct domain *dp; 941 struct ifnet *iter; 942 int found = 0; 943 944 IFNET_WLOCK(); 945 TAILQ_FOREACH(iter, &V_ifnet, if_link) 946 if (iter == ifp) { 947 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 948 found = 1; 949 break; 950 } 951#ifdef VIMAGE 952 if (found) 953 curvnet->ifcnt--; 954#endif 955 IFNET_WUNLOCK(); 956 if (!found) { 957 if (vmove) 958 panic("interface not in it's own ifnet list"); 959 else 960 return; /* XXX this should panic as well? */ 961 } 962 963 /* 964 * Remove/wait for pending events. 965 */ 966 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 967 968 /* 969 * Remove routes and flush queues. 970 */ 971 if_down(ifp); 972#ifdef ALTQ 973 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 974 altq_disable(&ifp->if_snd); 975 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 976 altq_detach(&ifp->if_snd); 977#endif 978 979 if_purgeaddrs(ifp); 980 981#ifdef INET 982 in_ifdetach(ifp); 983#endif 984 985#ifdef INET6 986 /* 987 * Remove all IPv6 kernel structs related to ifp. This should be done 988 * before removing routing entries below, since IPv6 interface direct 989 * routes are expected to be removed by the IPv6-specific kernel API. 990 * Otherwise, the kernel will detect some inconsistency and bark it. 991 */ 992 in6_ifdetach(ifp); 993#endif 994 if_purgemaddrs(ifp); 995 996 if (!vmove) { 997 /* 998 * Prevent further calls into the device driver via ifnet. 999 */ 1000 if_dead(ifp); 1001 1002 /* 1003 * Remove link ifaddr pointer and maybe decrement if_index. 1004 * Clean up all addresses. 1005 */ 1006 ifp->if_addr = NULL; 1007 if (IS_DEFAULT_VNET(curvnet)) 1008 destroy_dev(ifdev_byindex(ifp->if_index)); 1009 ifdev_setbyindex(ifp->if_index, NULL); 1010 1011 /* We can now free link ifaddr. */ 1012 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 1013 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1014 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 1015 ifa_free(ifa); 1016 } 1017 } 1018 1019 /* 1020 * Delete all remaining routes using this interface 1021 * Unfortuneatly the only way to do this is to slog through 1022 * the entire routing table looking for routes which point 1023 * to this interface...oh well... 1024 */ 1025 for (i = 1; i <= AF_MAX; i++) { 1026 for (j = 0; j < rt_numfibs; j++) { 1027 rnh = rt_tables_get_rnh(j, i); 1028 if (rnh == NULL) 1029 continue; 1030 RADIX_NODE_HEAD_LOCK(rnh); 1031 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 1032 RADIX_NODE_HEAD_UNLOCK(rnh); 1033 } 1034 } 1035 1036 /* Announce that the interface is gone. */ 1037 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1038 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1039 if (IS_DEFAULT_VNET(curvnet)) 1040 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1041 if_delgroups(ifp); 1042 1043 IF_AFDATA_LOCK(ifp); 1044 for (dp = domains; dp; dp = dp->dom_next) { 1045 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 1046 (*dp->dom_ifdetach)(ifp, 1047 ifp->if_afdata[dp->dom_family]); 1048 } 1049 ifp->if_afdata_initialized = 0; 1050 IF_AFDATA_UNLOCK(ifp); 1051} 1052 1053#ifdef VIMAGE 1054/* 1055 * if_vmove() performs a limited version of if_detach() in current 1056 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1057 * An attempt is made to shrink if_index in current vnet, find an 1058 * unused if_index in target vnet and calls if_grow() if necessary, 1059 * and finally find an unused if_xname for the target vnet. 1060 */ 1061void 1062if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1063{ 1064 1065 /* 1066 * Detach from current vnet, but preserve LLADDR info, do not 1067 * mark as dead etc. so that the ifnet can be reattached later. 1068 */ 1069 if_detach_internal(ifp, 1); 1070 1071 /* 1072 * Unlink the ifnet from ifindex_table[] in current vnet, 1073 * and shrink the if_index for that vnet if possible. 1074 * do / while construct below is needed to confine the scope 1075 * of INIT_VNET_NET(). 1076 */ 1077 { 1078 INIT_VNET_NET(curvnet); 1079 1080 IFNET_WLOCK(); 1081 ifnet_setbyindex(ifp->if_index, NULL); 1082 while (V_if_index > 0 && \ 1083 ifnet_byindex_locked(V_if_index) == NULL) 1084 V_if_index--; 1085 IFNET_WUNLOCK(); 1086 }; 1087 1088 /* 1089 * Switch to the context of the target vnet. 1090 */ 1091 CURVNET_SET_QUIET(new_vnet); 1092 INIT_VNET_NET(new_vnet); 1093 1094 /* 1095 * Try to find an empty slot below if_index. If we fail, take 1096 * the next slot. 1097 */ 1098 IFNET_WLOCK(); 1099 for (ifp->if_index = 1; ifp->if_index <= V_if_index; ifp->if_index++) { 1100 if (ifnet_byindex_locked(ifp->if_index) == NULL) 1101 break; 1102 } 1103 /* Catch if_index overflow. */ 1104 if (ifp->if_index < 1) 1105 panic("if_index overflow"); 1106 1107 if (ifp->if_index > V_if_index) 1108 V_if_index = ifp->if_index; 1109 if (V_if_index >= V_if_indexlim) 1110 if_grow(); 1111 ifnet_setbyindex(ifp->if_index, ifp); 1112 IFNET_WUNLOCK(); 1113 1114 if_attach_internal(ifp, 1); 1115 1116 CURVNET_RESTORE(); 1117} 1118#endif /* VIMAGE */ 1119 1120/* 1121 * Add a group to an interface 1122 */ 1123int 1124if_addgroup(struct ifnet *ifp, const char *groupname) 1125{ 1126 INIT_VNET_NET(ifp->if_vnet); 1127 struct ifg_list *ifgl; 1128 struct ifg_group *ifg = NULL; 1129 struct ifg_member *ifgm; 1130 1131 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1132 groupname[strlen(groupname) - 1] <= '9') 1133 return (EINVAL); 1134 1135 IFNET_WLOCK(); 1136 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1137 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1138 IFNET_WUNLOCK(); 1139 return (EEXIST); 1140 } 1141 1142 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1143 M_NOWAIT)) == NULL) { 1144 IFNET_WUNLOCK(); 1145 return (ENOMEM); 1146 } 1147 1148 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1149 M_TEMP, M_NOWAIT)) == NULL) { 1150 free(ifgl, M_TEMP); 1151 IFNET_WUNLOCK(); 1152 return (ENOMEM); 1153 } 1154 1155 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1156 if (!strcmp(ifg->ifg_group, groupname)) 1157 break; 1158 1159 if (ifg == NULL) { 1160 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1161 M_TEMP, M_NOWAIT)) == NULL) { 1162 free(ifgl, M_TEMP); 1163 free(ifgm, M_TEMP); 1164 IFNET_WUNLOCK(); 1165 return (ENOMEM); 1166 } 1167 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1168 ifg->ifg_refcnt = 0; 1169 TAILQ_INIT(&ifg->ifg_members); 1170 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1171 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1172 } 1173 1174 ifg->ifg_refcnt++; 1175 ifgl->ifgl_group = ifg; 1176 ifgm->ifgm_ifp = ifp; 1177 1178 IF_ADDR_LOCK(ifp); 1179 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1180 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1181 IF_ADDR_UNLOCK(ifp); 1182 1183 IFNET_WUNLOCK(); 1184 1185 EVENTHANDLER_INVOKE(group_change_event, groupname); 1186 1187 return (0); 1188} 1189 1190/* 1191 * Remove a group from an interface 1192 */ 1193int 1194if_delgroup(struct ifnet *ifp, const char *groupname) 1195{ 1196 INIT_VNET_NET(ifp->if_vnet); 1197 struct ifg_list *ifgl; 1198 struct ifg_member *ifgm; 1199 1200 IFNET_WLOCK(); 1201 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1202 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1203 break; 1204 if (ifgl == NULL) { 1205 IFNET_WUNLOCK(); 1206 return (ENOENT); 1207 } 1208 1209 IF_ADDR_LOCK(ifp); 1210 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1211 IF_ADDR_UNLOCK(ifp); 1212 1213 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1214 if (ifgm->ifgm_ifp == ifp) 1215 break; 1216 1217 if (ifgm != NULL) { 1218 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1219 free(ifgm, M_TEMP); 1220 } 1221 1222 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1223 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1224 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1225 free(ifgl->ifgl_group, M_TEMP); 1226 } 1227 IFNET_WUNLOCK(); 1228 1229 free(ifgl, M_TEMP); 1230 1231 EVENTHANDLER_INVOKE(group_change_event, groupname); 1232 1233 return (0); 1234} 1235 1236/* 1237 * Remove an interface from all groups 1238 */ 1239static void 1240if_delgroups(struct ifnet *ifp) 1241{ 1242 INIT_VNET_NET(ifp->if_vnet); 1243 struct ifg_list *ifgl; 1244 struct ifg_member *ifgm; 1245 char groupname[IFNAMSIZ]; 1246 1247 IFNET_WLOCK(); 1248 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1249 ifgl = TAILQ_FIRST(&ifp->if_groups); 1250 1251 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1252 1253 IF_ADDR_LOCK(ifp); 1254 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1255 IF_ADDR_UNLOCK(ifp); 1256 1257 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1258 if (ifgm->ifgm_ifp == ifp) 1259 break; 1260 1261 if (ifgm != NULL) { 1262 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1263 ifgm_next); 1264 free(ifgm, M_TEMP); 1265 } 1266 1267 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1268 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1269 EVENTHANDLER_INVOKE(group_detach_event, 1270 ifgl->ifgl_group); 1271 free(ifgl->ifgl_group, M_TEMP); 1272 } 1273 IFNET_WUNLOCK(); 1274 1275 free(ifgl, M_TEMP); 1276 1277 EVENTHANDLER_INVOKE(group_change_event, groupname); 1278 1279 IFNET_WLOCK(); 1280 } 1281 IFNET_WUNLOCK(); 1282} 1283 1284/* 1285 * Stores all groups from an interface in memory pointed 1286 * to by data 1287 */ 1288static int 1289if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1290{ 1291 int len, error; 1292 struct ifg_list *ifgl; 1293 struct ifg_req ifgrq, *ifgp; 1294 struct ifgroupreq *ifgr = data; 1295 1296 if (ifgr->ifgr_len == 0) { 1297 IF_ADDR_LOCK(ifp); 1298 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1299 ifgr->ifgr_len += sizeof(struct ifg_req); 1300 IF_ADDR_UNLOCK(ifp); 1301 return (0); 1302 } 1303 1304 len = ifgr->ifgr_len; 1305 ifgp = ifgr->ifgr_groups; 1306 /* XXX: wire */ 1307 IF_ADDR_LOCK(ifp); 1308 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1309 if (len < sizeof(ifgrq)) { 1310 IF_ADDR_UNLOCK(ifp); 1311 return (EINVAL); 1312 } 1313 bzero(&ifgrq, sizeof ifgrq); 1314 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1315 sizeof(ifgrq.ifgrq_group)); 1316 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1317 IF_ADDR_UNLOCK(ifp); 1318 return (error); 1319 } 1320 len -= sizeof(ifgrq); 1321 ifgp++; 1322 } 1323 IF_ADDR_UNLOCK(ifp); 1324 1325 return (0); 1326} 1327 1328/* 1329 * Stores all members of a group in memory pointed to by data 1330 */ 1331static int 1332if_getgroupmembers(struct ifgroupreq *data) 1333{ 1334 INIT_VNET_NET(curvnet); 1335 struct ifgroupreq *ifgr = data; 1336 struct ifg_group *ifg; 1337 struct ifg_member *ifgm; 1338 struct ifg_req ifgrq, *ifgp; 1339 int len, error; 1340 1341 IFNET_RLOCK(); 1342 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1343 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1344 break; 1345 if (ifg == NULL) { 1346 IFNET_RUNLOCK(); 1347 return (ENOENT); 1348 } 1349 1350 if (ifgr->ifgr_len == 0) { 1351 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1352 ifgr->ifgr_len += sizeof(ifgrq); 1353 IFNET_RUNLOCK(); 1354 return (0); 1355 } 1356 1357 len = ifgr->ifgr_len; 1358 ifgp = ifgr->ifgr_groups; 1359 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1360 if (len < sizeof(ifgrq)) { 1361 IFNET_RUNLOCK(); 1362 return (EINVAL); 1363 } 1364 bzero(&ifgrq, sizeof ifgrq); 1365 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1366 sizeof(ifgrq.ifgrq_member)); 1367 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1368 IFNET_RUNLOCK(); 1369 return (error); 1370 } 1371 len -= sizeof(ifgrq); 1372 ifgp++; 1373 } 1374 IFNET_RUNLOCK(); 1375 1376 return (0); 1377} 1378 1379/* 1380 * Delete Routes for a Network Interface 1381 * 1382 * Called for each routing entry via the rnh->rnh_walktree() call above 1383 * to delete all route entries referencing a detaching network interface. 1384 * 1385 * Arguments: 1386 * rn pointer to node in the routing table 1387 * arg argument passed to rnh->rnh_walktree() - detaching interface 1388 * 1389 * Returns: 1390 * 0 successful 1391 * errno failed - reason indicated 1392 * 1393 */ 1394static int 1395if_rtdel(struct radix_node *rn, void *arg) 1396{ 1397 struct rtentry *rt = (struct rtentry *)rn; 1398 struct ifnet *ifp = arg; 1399 int err; 1400 1401 if (rt->rt_ifp == ifp) { 1402 1403 /* 1404 * Protect (sorta) against walktree recursion problems 1405 * with cloned routes 1406 */ 1407 if ((rt->rt_flags & RTF_UP) == 0) 1408 return (0); 1409 1410 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1411 rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED, 1412 (struct rtentry **) NULL, rt->rt_fibnum); 1413 if (err) { 1414 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1415 } 1416 } 1417 1418 return (0); 1419} 1420 1421/* 1422 * Reference count functions for ifaddrs. 1423 */ 1424void 1425ifa_init(struct ifaddr *ifa) 1426{ 1427 1428 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1429 refcount_init(&ifa->ifa_refcnt, 1); 1430} 1431 1432void 1433ifa_ref(struct ifaddr *ifa) 1434{ 1435 1436 refcount_acquire(&ifa->ifa_refcnt); 1437} 1438 1439void 1440ifa_free(struct ifaddr *ifa) 1441{ 1442 1443 if (refcount_release(&ifa->ifa_refcnt)) { 1444 mtx_destroy(&ifa->ifa_mtx); 1445 free(ifa, M_IFADDR); 1446 } 1447} 1448 1449/* 1450 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1451 * structs used to represent other address families, it is necessary 1452 * to perform a different comparison. 1453 */ 1454 1455#define sa_equal(a1, a2) \ 1456 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1457 1458#define sa_dl_equal(a1, a2) \ 1459 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1460 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1461 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1462 LLADDR((struct sockaddr_dl *)(a2)), \ 1463 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1464 1465/* 1466 * Locate an interface based on a complete address. 1467 */ 1468/*ARGSUSED*/ 1469static struct ifaddr * 1470ifa_ifwithaddr_internal(struct sockaddr *addr) 1471{ 1472 INIT_VNET_NET(curvnet); 1473 struct ifnet *ifp; 1474 struct ifaddr *ifa; 1475 1476 IFNET_RLOCK(); 1477 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1478 IF_ADDR_LOCK(ifp); 1479 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1480 if (ifa->ifa_addr->sa_family != addr->sa_family) 1481 continue; 1482 if (sa_equal(addr, ifa->ifa_addr)) { 1483 IF_ADDR_UNLOCK(ifp); 1484 goto done; 1485 } 1486 /* IP6 doesn't have broadcast */ 1487 if ((ifp->if_flags & IFF_BROADCAST) && 1488 ifa->ifa_broadaddr && 1489 ifa->ifa_broadaddr->sa_len != 0 && 1490 sa_equal(ifa->ifa_broadaddr, addr)) { 1491 IF_ADDR_UNLOCK(ifp); 1492 goto done; 1493 } 1494 } 1495 IF_ADDR_UNLOCK(ifp); 1496 } 1497 ifa = NULL; 1498done: 1499 IFNET_RUNLOCK(); 1500 return (ifa); 1501} 1502 1503struct ifaddr * 1504ifa_ifwithaddr(struct sockaddr *addr) 1505{ 1506 1507 return (ifa_ifwithaddr_internal(addr)); 1508} 1509 1510int 1511ifa_ifwithaddr_check(struct sockaddr *addr) 1512{ 1513 1514 return (ifa_ifwithaddr_internal(addr) != NULL); 1515} 1516 1517/* 1518 * Locate an interface based on the broadcast address. 1519 */ 1520/* ARGSUSED */ 1521struct ifaddr * 1522ifa_ifwithbroadaddr(struct sockaddr *addr) 1523{ 1524 INIT_VNET_NET(curvnet); 1525 struct ifnet *ifp; 1526 struct ifaddr *ifa; 1527 1528 IFNET_RLOCK(); 1529 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1530 IF_ADDR_LOCK(ifp); 1531 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1532 if (ifa->ifa_addr->sa_family != addr->sa_family) 1533 continue; 1534 if ((ifp->if_flags & IFF_BROADCAST) && 1535 ifa->ifa_broadaddr && 1536 ifa->ifa_broadaddr->sa_len != 0 && 1537 sa_equal(ifa->ifa_broadaddr, addr)) { 1538 IF_ADDR_UNLOCK(ifp); 1539 goto done; 1540 } 1541 } 1542 IF_ADDR_UNLOCK(ifp); 1543 } 1544 ifa = NULL; 1545done: 1546 IFNET_RUNLOCK(); 1547 return (ifa); 1548} 1549 1550/* 1551 * Locate the point to point interface with a given destination address. 1552 */ 1553/*ARGSUSED*/ 1554struct ifaddr * 1555ifa_ifwithdstaddr(struct sockaddr *addr) 1556{ 1557 INIT_VNET_NET(curvnet); 1558 struct ifnet *ifp; 1559 struct ifaddr *ifa; 1560 1561 IFNET_RLOCK(); 1562 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1563 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1564 continue; 1565 IF_ADDR_LOCK(ifp); 1566 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1567 if (ifa->ifa_addr->sa_family != addr->sa_family) 1568 continue; 1569 if (ifa->ifa_dstaddr != NULL && 1570 sa_equal(addr, ifa->ifa_dstaddr)) { 1571 IF_ADDR_UNLOCK(ifp); 1572 goto done; 1573 } 1574 } 1575 IF_ADDR_UNLOCK(ifp); 1576 } 1577 ifa = NULL; 1578done: 1579 IFNET_RUNLOCK(); 1580 return (ifa); 1581} 1582 1583/* 1584 * Find an interface on a specific network. If many, choice 1585 * is most specific found. 1586 */ 1587struct ifaddr * 1588ifa_ifwithnet(struct sockaddr *addr) 1589{ 1590 INIT_VNET_NET(curvnet); 1591 struct ifnet *ifp; 1592 struct ifaddr *ifa; 1593 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 1594 u_int af = addr->sa_family; 1595 char *addr_data = addr->sa_data, *cplim; 1596 1597 /* 1598 * AF_LINK addresses can be looked up directly by their index number, 1599 * so do that if we can. 1600 */ 1601 if (af == AF_LINK) { 1602 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1603 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1604 return (ifaddr_byindex(sdl->sdl_index)); 1605 } 1606 1607 /* 1608 * Scan though each interface, looking for ones that have 1609 * addresses in this address family. 1610 */ 1611 IFNET_RLOCK(); 1612 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1613 IF_ADDR_LOCK(ifp); 1614 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1615 char *cp, *cp2, *cp3; 1616 1617 if (ifa->ifa_addr->sa_family != af) 1618next: continue; 1619 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 1620 /* 1621 * This is a bit broken as it doesn't 1622 * take into account that the remote end may 1623 * be a single node in the network we are 1624 * looking for. 1625 * The trouble is that we don't know the 1626 * netmask for the remote end. 1627 */ 1628 if (ifa->ifa_dstaddr != NULL && 1629 sa_equal(addr, ifa->ifa_dstaddr)) { 1630 IF_ADDR_UNLOCK(ifp); 1631 goto done; 1632 } 1633 } else { 1634 /* 1635 * if we have a special address handler, 1636 * then use it instead of the generic one. 1637 */ 1638 if (ifa->ifa_claim_addr) { 1639 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1640 IF_ADDR_UNLOCK(ifp); 1641 goto done; 1642 } 1643 continue; 1644 } 1645 1646 /* 1647 * Scan all the bits in the ifa's address. 1648 * If a bit dissagrees with what we are 1649 * looking for, mask it with the netmask 1650 * to see if it really matters. 1651 * (A byte at a time) 1652 */ 1653 if (ifa->ifa_netmask == 0) 1654 continue; 1655 cp = addr_data; 1656 cp2 = ifa->ifa_addr->sa_data; 1657 cp3 = ifa->ifa_netmask->sa_data; 1658 cplim = ifa->ifa_netmask->sa_len 1659 + (char *)ifa->ifa_netmask; 1660 while (cp3 < cplim) 1661 if ((*cp++ ^ *cp2++) & *cp3++) 1662 goto next; /* next address! */ 1663 /* 1664 * If the netmask of what we just found 1665 * is more specific than what we had before 1666 * (if we had one) then remember the new one 1667 * before continuing to search 1668 * for an even better one. 1669 */ 1670 if (ifa_maybe == 0 || 1671 rn_refines((caddr_t)ifa->ifa_netmask, 1672 (caddr_t)ifa_maybe->ifa_netmask)) 1673 ifa_maybe = ifa; 1674 } 1675 } 1676 IF_ADDR_UNLOCK(ifp); 1677 } 1678 ifa = ifa_maybe; 1679done: 1680 IFNET_RUNLOCK(); 1681 return (ifa); 1682} 1683 1684/* 1685 * Find an interface address specific to an interface best matching 1686 * a given address. 1687 */ 1688struct ifaddr * 1689ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1690{ 1691 struct ifaddr *ifa; 1692 char *cp, *cp2, *cp3; 1693 char *cplim; 1694 struct ifaddr *ifa_maybe = 0; 1695 u_int af = addr->sa_family; 1696 1697 if (af >= AF_MAX) 1698 return (0); 1699 IF_ADDR_LOCK(ifp); 1700 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1701 if (ifa->ifa_addr->sa_family != af) 1702 continue; 1703 if (ifa_maybe == 0) 1704 ifa_maybe = ifa; 1705 if (ifa->ifa_netmask == 0) { 1706 if (sa_equal(addr, ifa->ifa_addr) || 1707 (ifa->ifa_dstaddr && 1708 sa_equal(addr, ifa->ifa_dstaddr))) 1709 goto done; 1710 continue; 1711 } 1712 if (ifp->if_flags & IFF_POINTOPOINT) { 1713 if (sa_equal(addr, ifa->ifa_dstaddr)) 1714 goto done; 1715 } else { 1716 cp = addr->sa_data; 1717 cp2 = ifa->ifa_addr->sa_data; 1718 cp3 = ifa->ifa_netmask->sa_data; 1719 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1720 for (; cp3 < cplim; cp3++) 1721 if ((*cp++ ^ *cp2++) & *cp3) 1722 break; 1723 if (cp3 == cplim) 1724 goto done; 1725 } 1726 } 1727 ifa = ifa_maybe; 1728done: 1729 IF_ADDR_UNLOCK(ifp); 1730 return (ifa); 1731} 1732 1733#include <net/route.h> 1734#include <net/if_llatbl.h> 1735 1736/* 1737 * Default action when installing a route with a Link Level gateway. 1738 * Lookup an appropriate real ifa to point to. 1739 * This should be moved to /sys/net/link.c eventually. 1740 */ 1741static void 1742link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1743{ 1744 struct ifaddr *ifa, *oifa; 1745 struct sockaddr *dst; 1746 struct ifnet *ifp; 1747 1748 RT_LOCK_ASSERT(rt); 1749 1750 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1751 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1752 return; 1753 ifa = ifaof_ifpforaddr(dst, ifp); 1754 if (ifa) { 1755 ifa_ref(ifa); /* XXX */ 1756 oifa = rt->rt_ifa; 1757 rt->rt_ifa = ifa; 1758 ifa_free(oifa); 1759 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1760 ifa->ifa_rtrequest(cmd, rt, info); 1761 } 1762} 1763 1764/* 1765 * Mark an interface down and notify protocols of 1766 * the transition. 1767 * NOTE: must be called at splnet or eqivalent. 1768 */ 1769static void 1770if_unroute(struct ifnet *ifp, int flag, int fam) 1771{ 1772 struct ifaddr *ifa; 1773 1774 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1775 1776 ifp->if_flags &= ~flag; 1777 getmicrotime(&ifp->if_lastchange); 1778 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1779 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1780 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1781 ifp->if_qflush(ifp); 1782 1783#if defined(INET) || defined(INET6) 1784#ifdef DEV_CARP 1785 if (ifp->if_carp) 1786 carp_carpdev_state(ifp->if_carp); 1787#endif 1788#endif 1789 rt_ifmsg(ifp); 1790} 1791 1792/* 1793 * Mark an interface up and notify protocols of 1794 * the transition. 1795 * NOTE: must be called at splnet or eqivalent. 1796 */ 1797static void 1798if_route(struct ifnet *ifp, int flag, int fam) 1799{ 1800 struct ifaddr *ifa; 1801 1802 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1803 1804 ifp->if_flags |= flag; 1805 getmicrotime(&ifp->if_lastchange); 1806 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1807 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1808 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1809#if defined(INET) || defined(INET6) 1810#ifdef DEV_CARP 1811 if (ifp->if_carp) 1812 carp_carpdev_state(ifp->if_carp); 1813#endif 1814#endif 1815 rt_ifmsg(ifp); 1816#ifdef INET6 1817 in6_if_up(ifp); 1818#endif 1819} 1820 1821void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1822void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1823 1824/* 1825 * Handle a change in the interface link state. To avoid LORs 1826 * between driver lock and upper layer locks, as well as possible 1827 * recursions, we post event to taskqueue, and all job 1828 * is done in static do_link_state_change(). 1829 */ 1830void 1831if_link_state_change(struct ifnet *ifp, int link_state) 1832{ 1833 /* Return if state hasn't changed. */ 1834 if (ifp->if_link_state == link_state) 1835 return; 1836 1837 ifp->if_link_state = link_state; 1838 1839 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1840} 1841 1842static void 1843do_link_state_change(void *arg, int pending) 1844{ 1845 struct ifnet *ifp = (struct ifnet *)arg; 1846 int link_state = ifp->if_link_state; 1847 int link; 1848 CURVNET_SET(ifp->if_vnet); 1849 1850 /* Notify that the link state has changed. */ 1851 rt_ifmsg(ifp); 1852 if (link_state == LINK_STATE_UP) 1853 link = NOTE_LINKUP; 1854 else if (link_state == LINK_STATE_DOWN) 1855 link = NOTE_LINKDOWN; 1856 else 1857 link = NOTE_LINKINV; 1858 KNOTE_UNLOCKED(&ifp->if_klist, link); 1859 if (ifp->if_vlantrunk != NULL) 1860 (*vlan_link_state_p)(ifp, link); 1861 1862 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1863 IFP2AC(ifp)->ac_netgraph != NULL) 1864 (*ng_ether_link_state_p)(ifp, link_state); 1865#if defined(INET) || defined(INET6) 1866#ifdef DEV_CARP 1867 if (ifp->if_carp) 1868 carp_carpdev_state(ifp->if_carp); 1869#endif 1870#endif 1871 if (ifp->if_bridge) { 1872 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1873 (*bstp_linkstate_p)(ifp, link_state); 1874 } 1875 if (ifp->if_lagg) { 1876 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1877 (*lagg_linkstate_p)(ifp, link_state); 1878 } 1879 1880 if (IS_DEFAULT_VNET(curvnet)) 1881 devctl_notify("IFNET", ifp->if_xname, 1882 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1883 NULL); 1884 if (pending > 1) 1885 if_printf(ifp, "%d link states coalesced\n", pending); 1886 if (log_link_state_change) 1887 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1888 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1889 CURVNET_RESTORE(); 1890} 1891 1892/* 1893 * Mark an interface down and notify protocols of 1894 * the transition. 1895 * NOTE: must be called at splnet or eqivalent. 1896 */ 1897void 1898if_down(struct ifnet *ifp) 1899{ 1900 1901 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1902} 1903 1904/* 1905 * Mark an interface up and notify protocols of 1906 * the transition. 1907 * NOTE: must be called at splnet or eqivalent. 1908 */ 1909void 1910if_up(struct ifnet *ifp) 1911{ 1912 1913 if_route(ifp, IFF_UP, AF_UNSPEC); 1914} 1915 1916/* 1917 * Flush an interface queue. 1918 */ 1919void 1920if_qflush(struct ifnet *ifp) 1921{ 1922 struct mbuf *m, *n; 1923 struct ifaltq *ifq; 1924 1925 ifq = &ifp->if_snd; 1926 IFQ_LOCK(ifq); 1927#ifdef ALTQ 1928 if (ALTQ_IS_ENABLED(ifq)) 1929 ALTQ_PURGE(ifq); 1930#endif 1931 n = ifq->ifq_head; 1932 while ((m = n) != 0) { 1933 n = m->m_act; 1934 m_freem(m); 1935 } 1936 ifq->ifq_head = 0; 1937 ifq->ifq_tail = 0; 1938 ifq->ifq_len = 0; 1939 IFQ_UNLOCK(ifq); 1940} 1941 1942/* 1943 * Handle interface watchdog timer routines. Called 1944 * from softclock, we decrement timers (if set) and 1945 * call the appropriate interface routine on expiration. 1946 * 1947 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1948 * holding Giant. 1949 */ 1950static void 1951if_slowtimo(void *arg) 1952{ 1953 VNET_ITERATOR_DECL(vnet_iter); 1954 struct ifnet *ifp; 1955 int s = splimp(); 1956 1957 IFNET_RLOCK(); 1958 VNET_LIST_RLOCK(); 1959 VNET_FOREACH(vnet_iter) { 1960 CURVNET_SET(vnet_iter); 1961 INIT_VNET_NET(vnet_iter); 1962 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1963 if (ifp->if_timer == 0 || --ifp->if_timer) 1964 continue; 1965 if (ifp->if_watchdog) 1966 (*ifp->if_watchdog)(ifp); 1967 } 1968 CURVNET_RESTORE(); 1969 } 1970 VNET_LIST_RUNLOCK(); 1971 IFNET_RUNLOCK(); 1972 splx(s); 1973 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1974} 1975 1976/* 1977 * Map interface name to interface structure pointer, with or without 1978 * returning a reference. 1979 */ 1980struct ifnet * 1981ifunit_ref(const char *name) 1982{ 1983 INIT_VNET_NET(curvnet); 1984 struct ifnet *ifp; 1985 1986 IFNET_RLOCK(); 1987 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1988 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 1989 !(ifp->if_flags & IFF_DYING)) 1990 break; 1991 } 1992 if (ifp != NULL) 1993 if_ref(ifp); 1994 IFNET_RUNLOCK(); 1995 return (ifp); 1996} 1997 1998struct ifnet * 1999ifunit(const char *name) 2000{ 2001 INIT_VNET_NET(curvnet); 2002 struct ifnet *ifp; 2003 2004 IFNET_RLOCK(); 2005 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2006 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2007 break; 2008 } 2009 IFNET_RUNLOCK(); 2010 return (ifp); 2011} 2012 2013/* 2014 * Hardware specific interface ioctls. 2015 */ 2016static int 2017ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2018{ 2019 struct ifreq *ifr; 2020 struct ifstat *ifs; 2021 int error = 0; 2022 int new_flags, temp_flags; 2023 size_t namelen, onamelen; 2024 char new_name[IFNAMSIZ]; 2025 struct ifaddr *ifa; 2026 struct sockaddr_dl *sdl; 2027 2028 ifr = (struct ifreq *)data; 2029 switch (cmd) { 2030 case SIOCGIFINDEX: 2031 ifr->ifr_index = ifp->if_index; 2032 break; 2033 2034 case SIOCGIFFLAGS: 2035 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2036 ifr->ifr_flags = temp_flags & 0xffff; 2037 ifr->ifr_flagshigh = temp_flags >> 16; 2038 break; 2039 2040 case SIOCGIFCAP: 2041 ifr->ifr_reqcap = ifp->if_capabilities; 2042 ifr->ifr_curcap = ifp->if_capenable; 2043 break; 2044 2045#ifdef MAC 2046 case SIOCGIFMAC: 2047 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2048 break; 2049#endif 2050 2051 case SIOCGIFMETRIC: 2052 ifr->ifr_metric = ifp->if_metric; 2053 break; 2054 2055 case SIOCGIFMTU: 2056 ifr->ifr_mtu = ifp->if_mtu; 2057 break; 2058 2059 case SIOCGIFPHYS: 2060 ifr->ifr_phys = ifp->if_physical; 2061 break; 2062 2063 case SIOCSIFFLAGS: 2064 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2065 if (error) 2066 return (error); 2067 /* 2068 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2069 * check, so we don't need special handling here yet. 2070 */ 2071 new_flags = (ifr->ifr_flags & 0xffff) | 2072 (ifr->ifr_flagshigh << 16); 2073 if (ifp->if_flags & IFF_SMART) { 2074 /* Smart drivers twiddle their own routes */ 2075 } else if (ifp->if_flags & IFF_UP && 2076 (new_flags & IFF_UP) == 0) { 2077 int s = splimp(); 2078 if_down(ifp); 2079 splx(s); 2080 } else if (new_flags & IFF_UP && 2081 (ifp->if_flags & IFF_UP) == 0) { 2082 int s = splimp(); 2083 if_up(ifp); 2084 splx(s); 2085 } 2086 /* See if permanently promiscuous mode bit is about to flip */ 2087 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2088 if (new_flags & IFF_PPROMISC) 2089 ifp->if_flags |= IFF_PROMISC; 2090 else if (ifp->if_pcount == 0) 2091 ifp->if_flags &= ~IFF_PROMISC; 2092 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2093 ifp->if_xname, 2094 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2095 } 2096 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2097 (new_flags &~ IFF_CANTCHANGE); 2098 if (ifp->if_ioctl) { 2099 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2100 } 2101 getmicrotime(&ifp->if_lastchange); 2102 break; 2103 2104 case SIOCSIFCAP: 2105 error = priv_check(td, PRIV_NET_SETIFCAP); 2106 if (error) 2107 return (error); 2108 if (ifp->if_ioctl == NULL) 2109 return (EOPNOTSUPP); 2110 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2111 return (EINVAL); 2112 error = (*ifp->if_ioctl)(ifp, cmd, data); 2113 if (error == 0) 2114 getmicrotime(&ifp->if_lastchange); 2115 break; 2116 2117#ifdef MAC 2118 case SIOCSIFMAC: 2119 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2120 break; 2121#endif 2122 2123 case SIOCSIFNAME: 2124 error = priv_check(td, PRIV_NET_SETIFNAME); 2125 if (error) 2126 return (error); 2127 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2128 if (error != 0) 2129 return (error); 2130 if (new_name[0] == '\0') 2131 return (EINVAL); 2132 if (ifunit(new_name) != NULL) 2133 return (EEXIST); 2134 2135 /* Announce the departure of the interface. */ 2136 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2137 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2138 2139 log(LOG_INFO, "%s: changing name to '%s'\n", 2140 ifp->if_xname, new_name); 2141 2142 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2143 ifa = ifp->if_addr; 2144 IFA_LOCK(ifa); 2145 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2146 namelen = strlen(new_name); 2147 onamelen = sdl->sdl_nlen; 2148 /* 2149 * Move the address if needed. This is safe because we 2150 * allocate space for a name of length IFNAMSIZ when we 2151 * create this in if_attach(). 2152 */ 2153 if (namelen != onamelen) { 2154 bcopy(sdl->sdl_data + onamelen, 2155 sdl->sdl_data + namelen, sdl->sdl_alen); 2156 } 2157 bcopy(new_name, sdl->sdl_data, namelen); 2158 sdl->sdl_nlen = namelen; 2159 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2160 bzero(sdl->sdl_data, onamelen); 2161 while (namelen != 0) 2162 sdl->sdl_data[--namelen] = 0xff; 2163 IFA_UNLOCK(ifa); 2164 2165 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2166 /* Announce the return of the interface. */ 2167 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2168 break; 2169 2170#ifdef VIMAGE 2171 case SIOCSIFVNET: 2172 error = priv_check(td, PRIV_NET_SETIFVNET); 2173 if (error) 2174 return (error); 2175 error = vi_if_move(td, ifp, ifr->ifr_name, ifr->ifr_jid, NULL); 2176 break; 2177#endif 2178 2179 case SIOCSIFMETRIC: 2180 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2181 if (error) 2182 return (error); 2183 ifp->if_metric = ifr->ifr_metric; 2184 getmicrotime(&ifp->if_lastchange); 2185 break; 2186 2187 case SIOCSIFPHYS: 2188 error = priv_check(td, PRIV_NET_SETIFPHYS); 2189 if (error) 2190 return (error); 2191 if (ifp->if_ioctl == NULL) 2192 return (EOPNOTSUPP); 2193 error = (*ifp->if_ioctl)(ifp, cmd, data); 2194 if (error == 0) 2195 getmicrotime(&ifp->if_lastchange); 2196 break; 2197 2198 case SIOCSIFMTU: 2199 { 2200 u_long oldmtu = ifp->if_mtu; 2201 2202 error = priv_check(td, PRIV_NET_SETIFMTU); 2203 if (error) 2204 return (error); 2205 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2206 return (EINVAL); 2207 if (ifp->if_ioctl == NULL) 2208 return (EOPNOTSUPP); 2209 error = (*ifp->if_ioctl)(ifp, cmd, data); 2210 if (error == 0) { 2211 getmicrotime(&ifp->if_lastchange); 2212 rt_ifmsg(ifp); 2213 } 2214 /* 2215 * If the link MTU changed, do network layer specific procedure. 2216 */ 2217 if (ifp->if_mtu != oldmtu) { 2218#ifdef INET6 2219 nd6_setmtu(ifp); 2220#endif 2221 } 2222 break; 2223 } 2224 2225 case SIOCADDMULTI: 2226 case SIOCDELMULTI: 2227 if (cmd == SIOCADDMULTI) 2228 error = priv_check(td, PRIV_NET_ADDMULTI); 2229 else 2230 error = priv_check(td, PRIV_NET_DELMULTI); 2231 if (error) 2232 return (error); 2233 2234 /* Don't allow group membership on non-multicast interfaces. */ 2235 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2236 return (EOPNOTSUPP); 2237 2238 /* Don't let users screw up protocols' entries. */ 2239 if (ifr->ifr_addr.sa_family != AF_LINK) 2240 return (EINVAL); 2241 2242 if (cmd == SIOCADDMULTI) { 2243 struct ifmultiaddr *ifma; 2244 2245 /* 2246 * Userland is only permitted to join groups once 2247 * via the if_addmulti() KPI, because it cannot hold 2248 * struct ifmultiaddr * between calls. It may also 2249 * lose a race while we check if the membership 2250 * already exists. 2251 */ 2252 IF_ADDR_LOCK(ifp); 2253 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2254 IF_ADDR_UNLOCK(ifp); 2255 if (ifma != NULL) 2256 error = EADDRINUSE; 2257 else 2258 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2259 } else { 2260 error = if_delmulti(ifp, &ifr->ifr_addr); 2261 } 2262 if (error == 0) 2263 getmicrotime(&ifp->if_lastchange); 2264 break; 2265 2266 case SIOCSIFPHYADDR: 2267 case SIOCDIFPHYADDR: 2268#ifdef INET6 2269 case SIOCSIFPHYADDR_IN6: 2270#endif 2271 case SIOCSLIFPHYADDR: 2272 case SIOCSIFMEDIA: 2273 case SIOCSIFGENERIC: 2274 error = priv_check(td, PRIV_NET_HWIOCTL); 2275 if (error) 2276 return (error); 2277 if (ifp->if_ioctl == NULL) 2278 return (EOPNOTSUPP); 2279 error = (*ifp->if_ioctl)(ifp, cmd, data); 2280 if (error == 0) 2281 getmicrotime(&ifp->if_lastchange); 2282 break; 2283 2284 case SIOCGIFSTATUS: 2285 ifs = (struct ifstat *)data; 2286 ifs->ascii[0] = '\0'; 2287 2288 case SIOCGIFPSRCADDR: 2289 case SIOCGIFPDSTADDR: 2290 case SIOCGLIFPHYADDR: 2291 case SIOCGIFMEDIA: 2292 case SIOCGIFGENERIC: 2293 if (ifp->if_ioctl == NULL) 2294 return (EOPNOTSUPP); 2295 error = (*ifp->if_ioctl)(ifp, cmd, data); 2296 break; 2297 2298 case SIOCSIFLLADDR: 2299 error = priv_check(td, PRIV_NET_SETLLADDR); 2300 if (error) 2301 return (error); 2302 error = if_setlladdr(ifp, 2303 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2304 break; 2305 2306 case SIOCAIFGROUP: 2307 { 2308 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2309 2310 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2311 if (error) 2312 return (error); 2313 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2314 return (error); 2315 break; 2316 } 2317 2318 case SIOCGIFGROUP: 2319 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2320 return (error); 2321 break; 2322 2323 case SIOCDIFGROUP: 2324 { 2325 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2326 2327 error = priv_check(td, PRIV_NET_DELIFGROUP); 2328 if (error) 2329 return (error); 2330 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2331 return (error); 2332 break; 2333 } 2334 2335 default: 2336 error = ENOIOCTL; 2337 break; 2338 } 2339 return (error); 2340} 2341 2342/* 2343 * Interface ioctls. 2344 */ 2345int 2346ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2347{ 2348 struct ifnet *ifp; 2349 struct ifreq *ifr; 2350 int error; 2351 int oif_flags; 2352 2353 switch (cmd) { 2354 case SIOCGIFCONF: 2355 case OSIOCGIFCONF: 2356#ifdef __amd64__ 2357 case SIOCGIFCONF32: 2358#endif 2359 return (ifconf(cmd, data)); 2360 } 2361 ifr = (struct ifreq *)data; 2362 2363 switch (cmd) { 2364#ifdef VIMAGE 2365 case SIOCSIFRVNET: 2366 error = priv_check(td, PRIV_NET_SETIFVNET); 2367 if (error) 2368 return (error); 2369 return (vi_if_move(td, NULL, ifr->ifr_name, ifr->ifr_jid, 2370 NULL)); 2371 /* 2372 * XXX vnet creation will be implemented through the new jail 2373 * framework - this is just a temporary hack for testing the 2374 * vnet create / destroy mechanisms. 2375 */ 2376 case SIOCSIFVIMAGE: 2377 error = vi_if_move(td, NULL, NULL, 0, (struct vi_req *) data); 2378 return (error); 2379 case SIOCSPVIMAGE: 2380 case SIOCGPVIMAGE: 2381 error = vi_td_ioctl(cmd, (struct vi_req *) data, td); 2382 return (error); 2383#endif 2384 case SIOCIFCREATE: 2385 case SIOCIFCREATE2: 2386 error = priv_check(td, PRIV_NET_IFCREATE); 2387 if (error) 2388 return (error); 2389 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 2390 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 2391 case SIOCIFDESTROY: 2392 error = priv_check(td, PRIV_NET_IFDESTROY); 2393 if (error) 2394 return (error); 2395 return if_clone_destroy(ifr->ifr_name); 2396 2397 case SIOCIFGCLONERS: 2398 return (if_clone_list((struct if_clonereq *)data)); 2399 case SIOCGIFGMEMB: 2400 return (if_getgroupmembers((struct ifgroupreq *)data)); 2401 } 2402 2403 ifp = ifunit_ref(ifr->ifr_name); 2404 if (ifp == NULL) 2405 return (ENXIO); 2406 2407 error = ifhwioctl(cmd, ifp, data, td); 2408 if (error != ENOIOCTL) { 2409 if_rele(ifp); 2410 return (error); 2411 } 2412 2413 oif_flags = ifp->if_flags; 2414 if (so->so_proto == NULL) { 2415 if_rele(ifp); 2416 return (EOPNOTSUPP); 2417 } 2418#ifndef COMPAT_43 2419 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2420 data, 2421 ifp, td)); 2422 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2423 error = (*ifp->if_ioctl)(ifp, cmd, data); 2424#else 2425 { 2426 u_long ocmd = cmd; 2427 2428 switch (cmd) { 2429 2430 case SIOCSIFDSTADDR: 2431 case SIOCSIFADDR: 2432 case SIOCSIFBRDADDR: 2433 case SIOCSIFNETMASK: 2434#if BYTE_ORDER != BIG_ENDIAN 2435 if (ifr->ifr_addr.sa_family == 0 && 2436 ifr->ifr_addr.sa_len < 16) { 2437 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2438 ifr->ifr_addr.sa_len = 16; 2439 } 2440#else 2441 if (ifr->ifr_addr.sa_len == 0) 2442 ifr->ifr_addr.sa_len = 16; 2443#endif 2444 break; 2445 2446 case OSIOCGIFADDR: 2447 cmd = SIOCGIFADDR; 2448 break; 2449 2450 case OSIOCGIFDSTADDR: 2451 cmd = SIOCGIFDSTADDR; 2452 break; 2453 2454 case OSIOCGIFBRDADDR: 2455 cmd = SIOCGIFBRDADDR; 2456 break; 2457 2458 case OSIOCGIFNETMASK: 2459 cmd = SIOCGIFNETMASK; 2460 } 2461 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2462 cmd, 2463 data, 2464 ifp, td)); 2465 if (error == EOPNOTSUPP && ifp != NULL && 2466 ifp->if_ioctl != NULL) 2467 error = (*ifp->if_ioctl)(ifp, cmd, data); 2468 switch (ocmd) { 2469 2470 case OSIOCGIFADDR: 2471 case OSIOCGIFDSTADDR: 2472 case OSIOCGIFBRDADDR: 2473 case OSIOCGIFNETMASK: 2474 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2475 2476 } 2477 } 2478#endif /* COMPAT_43 */ 2479 2480 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2481#ifdef INET6 2482 if (ifp->if_flags & IFF_UP) { 2483 int s = splimp(); 2484 in6_if_up(ifp); 2485 splx(s); 2486 } 2487#endif 2488 } 2489 if_rele(ifp); 2490 return (error); 2491} 2492 2493/* 2494 * The code common to handling reference counted flags, 2495 * e.g., in ifpromisc() and if_allmulti(). 2496 * The "pflag" argument can specify a permanent mode flag to check, 2497 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2498 * 2499 * Only to be used on stack-owned flags, not driver-owned flags. 2500 */ 2501static int 2502if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2503{ 2504 struct ifreq ifr; 2505 int error; 2506 int oldflags, oldcount; 2507 2508 /* Sanity checks to catch programming errors */ 2509 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2510 ("%s: setting driver-owned flag %d", __func__, flag)); 2511 2512 if (onswitch) 2513 KASSERT(*refcount >= 0, 2514 ("%s: increment negative refcount %d for flag %d", 2515 __func__, *refcount, flag)); 2516 else 2517 KASSERT(*refcount > 0, 2518 ("%s: decrement non-positive refcount %d for flag %d", 2519 __func__, *refcount, flag)); 2520 2521 /* In case this mode is permanent, just touch refcount */ 2522 if (ifp->if_flags & pflag) { 2523 *refcount += onswitch ? 1 : -1; 2524 return (0); 2525 } 2526 2527 /* Save ifnet parameters for if_ioctl() may fail */ 2528 oldcount = *refcount; 2529 oldflags = ifp->if_flags; 2530 2531 /* 2532 * See if we aren't the only and touching refcount is enough. 2533 * Actually toggle interface flag if we are the first or last. 2534 */ 2535 if (onswitch) { 2536 if ((*refcount)++) 2537 return (0); 2538 ifp->if_flags |= flag; 2539 } else { 2540 if (--(*refcount)) 2541 return (0); 2542 ifp->if_flags &= ~flag; 2543 } 2544 2545 /* Call down the driver since we've changed interface flags */ 2546 if (ifp->if_ioctl == NULL) { 2547 error = EOPNOTSUPP; 2548 goto recover; 2549 } 2550 ifr.ifr_flags = ifp->if_flags & 0xffff; 2551 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2552 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2553 if (error) 2554 goto recover; 2555 /* Notify userland that interface flags have changed */ 2556 rt_ifmsg(ifp); 2557 return (0); 2558 2559recover: 2560 /* Recover after driver error */ 2561 *refcount = oldcount; 2562 ifp->if_flags = oldflags; 2563 return (error); 2564} 2565 2566/* 2567 * Set/clear promiscuous mode on interface ifp based on the truth value 2568 * of pswitch. The calls are reference counted so that only the first 2569 * "on" request actually has an effect, as does the final "off" request. 2570 * Results are undefined if the "off" and "on" requests are not matched. 2571 */ 2572int 2573ifpromisc(struct ifnet *ifp, int pswitch) 2574{ 2575 int error; 2576 int oldflags = ifp->if_flags; 2577 2578 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2579 &ifp->if_pcount, pswitch); 2580 /* If promiscuous mode status has changed, log a message */ 2581 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2582 log(LOG_INFO, "%s: promiscuous mode %s\n", 2583 ifp->if_xname, 2584 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2585 return (error); 2586} 2587 2588/* 2589 * Return interface configuration 2590 * of system. List may be used 2591 * in later ioctl's (above) to get 2592 * other information. 2593 */ 2594/*ARGSUSED*/ 2595static int 2596ifconf(u_long cmd, caddr_t data) 2597{ 2598 INIT_VNET_NET(curvnet); 2599 struct ifconf *ifc = (struct ifconf *)data; 2600#ifdef __amd64__ 2601 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 2602 struct ifconf ifc_swab; 2603#endif 2604 struct ifnet *ifp; 2605 struct ifaddr *ifa; 2606 struct ifreq ifr; 2607 struct sbuf *sb; 2608 int error, full = 0, valid_len, max_len; 2609 2610#ifdef __amd64__ 2611 if (cmd == SIOCGIFCONF32) { 2612 ifc_swab.ifc_len = ifc32->ifc_len; 2613 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 2614 ifc = &ifc_swab; 2615 } 2616#endif 2617 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2618 max_len = MAXPHYS - 1; 2619 2620 /* Prevent hostile input from being able to crash the system */ 2621 if (ifc->ifc_len <= 0) 2622 return (EINVAL); 2623 2624again: 2625 if (ifc->ifc_len <= max_len) { 2626 max_len = ifc->ifc_len; 2627 full = 1; 2628 } 2629 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2630 max_len = 0; 2631 valid_len = 0; 2632 2633 IFNET_RLOCK(); /* could sleep XXX */ 2634 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2635 int addrs; 2636 2637 /* 2638 * Zero the ifr_name buffer to make sure we don't 2639 * disclose the contents of the stack. 2640 */ 2641 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2642 2643 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2644 >= sizeof(ifr.ifr_name)) { 2645 sbuf_delete(sb); 2646 IFNET_RUNLOCK(); 2647 return (ENAMETOOLONG); 2648 } 2649 2650 addrs = 0; 2651 IF_ADDR_LOCK(ifp); 2652 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2653 struct sockaddr *sa = ifa->ifa_addr; 2654 2655 if (prison_if(curthread->td_ucred, sa) != 0) 2656 continue; 2657 addrs++; 2658#ifdef COMPAT_43 2659 if (cmd == OSIOCGIFCONF) { 2660 struct osockaddr *osa = 2661 (struct osockaddr *)&ifr.ifr_addr; 2662 ifr.ifr_addr = *sa; 2663 osa->sa_family = sa->sa_family; 2664 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2665 max_len += sizeof(ifr); 2666 } else 2667#endif 2668 if (sa->sa_len <= sizeof(*sa)) { 2669 ifr.ifr_addr = *sa; 2670 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2671 max_len += sizeof(ifr); 2672 } else { 2673 sbuf_bcat(sb, &ifr, 2674 offsetof(struct ifreq, ifr_addr)); 2675 max_len += offsetof(struct ifreq, ifr_addr); 2676 sbuf_bcat(sb, sa, sa->sa_len); 2677 max_len += sa->sa_len; 2678 } 2679 2680 if (!sbuf_overflowed(sb)) 2681 valid_len = sbuf_len(sb); 2682 } 2683 IF_ADDR_UNLOCK(ifp); 2684 if (addrs == 0) { 2685 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2686 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2687 max_len += sizeof(ifr); 2688 2689 if (!sbuf_overflowed(sb)) 2690 valid_len = sbuf_len(sb); 2691 } 2692 } 2693 IFNET_RUNLOCK(); 2694 2695 /* 2696 * If we didn't allocate enough space (uncommon), try again. If 2697 * we have already allocated as much space as we are allowed, 2698 * return what we've got. 2699 */ 2700 if (valid_len != max_len && !full) { 2701 sbuf_delete(sb); 2702 goto again; 2703 } 2704 2705 ifc->ifc_len = valid_len; 2706#ifdef __amd64__ 2707 if (cmd == SIOCGIFCONF32) 2708 ifc32->ifc_len = valid_len; 2709#endif 2710 sbuf_finish(sb); 2711 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2712 sbuf_delete(sb); 2713 return (error); 2714} 2715 2716/* 2717 * Just like ifpromisc(), but for all-multicast-reception mode. 2718 */ 2719int 2720if_allmulti(struct ifnet *ifp, int onswitch) 2721{ 2722 2723 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2724} 2725 2726struct ifmultiaddr * 2727if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2728{ 2729 struct ifmultiaddr *ifma; 2730 2731 IF_ADDR_LOCK_ASSERT(ifp); 2732 2733 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2734 if (sa->sa_family == AF_LINK) { 2735 if (sa_dl_equal(ifma->ifma_addr, sa)) 2736 break; 2737 } else { 2738 if (sa_equal(ifma->ifma_addr, sa)) 2739 break; 2740 } 2741 } 2742 2743 return ifma; 2744} 2745 2746/* 2747 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2748 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2749 * the ifnet multicast address list here, so the caller must do that and 2750 * other setup work (such as notifying the device driver). The reference 2751 * count is initialized to 1. 2752 */ 2753static struct ifmultiaddr * 2754if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2755 int mflags) 2756{ 2757 struct ifmultiaddr *ifma; 2758 struct sockaddr *dupsa; 2759 2760 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2761 M_ZERO); 2762 if (ifma == NULL) 2763 return (NULL); 2764 2765 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2766 if (dupsa == NULL) { 2767 free(ifma, M_IFMADDR); 2768 return (NULL); 2769 } 2770 bcopy(sa, dupsa, sa->sa_len); 2771 ifma->ifma_addr = dupsa; 2772 2773 ifma->ifma_ifp = ifp; 2774 ifma->ifma_refcount = 1; 2775 ifma->ifma_protospec = NULL; 2776 2777 if (llsa == NULL) { 2778 ifma->ifma_lladdr = NULL; 2779 return (ifma); 2780 } 2781 2782 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2783 if (dupsa == NULL) { 2784 free(ifma->ifma_addr, M_IFMADDR); 2785 free(ifma, M_IFMADDR); 2786 return (NULL); 2787 } 2788 bcopy(llsa, dupsa, llsa->sa_len); 2789 ifma->ifma_lladdr = dupsa; 2790 2791 return (ifma); 2792} 2793 2794/* 2795 * if_freemulti: free ifmultiaddr structure and possibly attached related 2796 * addresses. The caller is responsible for implementing reference 2797 * counting, notifying the driver, handling routing messages, and releasing 2798 * any dependent link layer state. 2799 */ 2800static void 2801if_freemulti(struct ifmultiaddr *ifma) 2802{ 2803 2804 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2805 ifma->ifma_refcount)); 2806 KASSERT(ifma->ifma_protospec == NULL, 2807 ("if_freemulti: protospec not NULL")); 2808 2809 if (ifma->ifma_lladdr != NULL) 2810 free(ifma->ifma_lladdr, M_IFMADDR); 2811 free(ifma->ifma_addr, M_IFMADDR); 2812 free(ifma, M_IFMADDR); 2813} 2814 2815/* 2816 * Register an additional multicast address with a network interface. 2817 * 2818 * - If the address is already present, bump the reference count on the 2819 * address and return. 2820 * - If the address is not link-layer, look up a link layer address. 2821 * - Allocate address structures for one or both addresses, and attach to the 2822 * multicast address list on the interface. If automatically adding a link 2823 * layer address, the protocol address will own a reference to the link 2824 * layer address, to be freed when it is freed. 2825 * - Notify the network device driver of an addition to the multicast address 2826 * list. 2827 * 2828 * 'sa' points to caller-owned memory with the desired multicast address. 2829 * 2830 * 'retifma' will be used to return a pointer to the resulting multicast 2831 * address reference, if desired. 2832 */ 2833int 2834if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2835 struct ifmultiaddr **retifma) 2836{ 2837 struct ifmultiaddr *ifma, *ll_ifma; 2838 struct sockaddr *llsa; 2839 int error; 2840 2841 /* 2842 * If the address is already present, return a new reference to it; 2843 * otherwise, allocate storage and set up a new address. 2844 */ 2845 IF_ADDR_LOCK(ifp); 2846 ifma = if_findmulti(ifp, sa); 2847 if (ifma != NULL) { 2848 ifma->ifma_refcount++; 2849 if (retifma != NULL) 2850 *retifma = ifma; 2851 IF_ADDR_UNLOCK(ifp); 2852 return (0); 2853 } 2854 2855 /* 2856 * The address isn't already present; resolve the protocol address 2857 * into a link layer address, and then look that up, bump its 2858 * refcount or allocate an ifma for that also. If 'llsa' was 2859 * returned, we will need to free it later. 2860 */ 2861 llsa = NULL; 2862 ll_ifma = NULL; 2863 if (ifp->if_resolvemulti != NULL) { 2864 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2865 if (error) 2866 goto unlock_out; 2867 } 2868 2869 /* 2870 * Allocate the new address. Don't hook it up yet, as we may also 2871 * need to allocate a link layer multicast address. 2872 */ 2873 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2874 if (ifma == NULL) { 2875 error = ENOMEM; 2876 goto free_llsa_out; 2877 } 2878 2879 /* 2880 * If a link layer address is found, we'll need to see if it's 2881 * already present in the address list, or allocate is as well. 2882 * When this block finishes, the link layer address will be on the 2883 * list. 2884 */ 2885 if (llsa != NULL) { 2886 ll_ifma = if_findmulti(ifp, llsa); 2887 if (ll_ifma == NULL) { 2888 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2889 if (ll_ifma == NULL) { 2890 --ifma->ifma_refcount; 2891 if_freemulti(ifma); 2892 error = ENOMEM; 2893 goto free_llsa_out; 2894 } 2895 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2896 ifma_link); 2897 } else 2898 ll_ifma->ifma_refcount++; 2899 ifma->ifma_llifma = ll_ifma; 2900 } 2901 2902 /* 2903 * We now have a new multicast address, ifma, and possibly a new or 2904 * referenced link layer address. Add the primary address to the 2905 * ifnet address list. 2906 */ 2907 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2908 2909 if (retifma != NULL) 2910 *retifma = ifma; 2911 2912 /* 2913 * Must generate the message while holding the lock so that 'ifma' 2914 * pointer is still valid. 2915 */ 2916 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2917 IF_ADDR_UNLOCK(ifp); 2918 2919 /* 2920 * We are certain we have added something, so call down to the 2921 * interface to let them know about it. 2922 */ 2923 if (ifp->if_ioctl != NULL) { 2924 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2925 } 2926 2927 if (llsa != NULL) 2928 free(llsa, M_IFMADDR); 2929 2930 return (0); 2931 2932free_llsa_out: 2933 if (llsa != NULL) 2934 free(llsa, M_IFMADDR); 2935 2936unlock_out: 2937 IF_ADDR_UNLOCK(ifp); 2938 return (error); 2939} 2940 2941/* 2942 * Delete a multicast group membership by network-layer group address. 2943 * 2944 * Returns ENOENT if the entry could not be found. If ifp no longer 2945 * exists, results are undefined. This entry point should only be used 2946 * from subsystems which do appropriate locking to hold ifp for the 2947 * duration of the call. 2948 * Network-layer protocol domains must use if_delmulti_ifma(). 2949 */ 2950int 2951if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2952{ 2953 struct ifmultiaddr *ifma; 2954 int lastref; 2955#ifdef INVARIANTS 2956 struct ifnet *oifp; 2957 INIT_VNET_NET(ifp->if_vnet); 2958 2959 IFNET_RLOCK(); 2960 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 2961 if (ifp == oifp) 2962 break; 2963 if (ifp != oifp) 2964 ifp = NULL; 2965 IFNET_RUNLOCK(); 2966 2967 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 2968#endif 2969 if (ifp == NULL) 2970 return (ENOENT); 2971 2972 IF_ADDR_LOCK(ifp); 2973 lastref = 0; 2974 ifma = if_findmulti(ifp, sa); 2975 if (ifma != NULL) 2976 lastref = if_delmulti_locked(ifp, ifma, 0); 2977 IF_ADDR_UNLOCK(ifp); 2978 2979 if (ifma == NULL) 2980 return (ENOENT); 2981 2982 if (lastref && ifp->if_ioctl != NULL) { 2983 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2984 } 2985 2986 return (0); 2987} 2988 2989/* 2990 * Delete a multicast group membership by group membership pointer. 2991 * Network-layer protocol domains must use this routine. 2992 * 2993 * It is safe to call this routine if the ifp disappeared. 2994 */ 2995void 2996if_delmulti_ifma(struct ifmultiaddr *ifma) 2997{ 2998#ifdef DIAGNOSTIC 2999 INIT_VNET_NET(curvnet); 3000#endif 3001 struct ifnet *ifp; 3002 int lastref; 3003 3004 ifp = ifma->ifma_ifp; 3005#ifdef DIAGNOSTIC 3006 if (ifp == NULL) { 3007 printf("%s: ifma_ifp seems to be detached\n", __func__); 3008 } else { 3009 struct ifnet *oifp; 3010 3011 IFNET_RLOCK(); 3012 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3013 if (ifp == oifp) 3014 break; 3015 if (ifp != oifp) { 3016 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3017 ifp = NULL; 3018 } 3019 IFNET_RUNLOCK(); 3020 } 3021#endif 3022 /* 3023 * If and only if the ifnet instance exists: Acquire the address lock. 3024 */ 3025 if (ifp != NULL) 3026 IF_ADDR_LOCK(ifp); 3027 3028 lastref = if_delmulti_locked(ifp, ifma, 0); 3029 3030 if (ifp != NULL) { 3031 /* 3032 * If and only if the ifnet instance exists: 3033 * Release the address lock. 3034 * If the group was left: update the hardware hash filter. 3035 */ 3036 IF_ADDR_UNLOCK(ifp); 3037 if (lastref && ifp->if_ioctl != NULL) { 3038 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3039 } 3040 } 3041} 3042 3043/* 3044 * Perform deletion of network-layer and/or link-layer multicast address. 3045 * 3046 * Return 0 if the reference count was decremented. 3047 * Return 1 if the final reference was released, indicating that the 3048 * hardware hash filter should be reprogrammed. 3049 */ 3050static int 3051if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3052{ 3053 struct ifmultiaddr *ll_ifma; 3054 3055 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3056 KASSERT(ifma->ifma_ifp == ifp, 3057 ("%s: inconsistent ifp %p", __func__, ifp)); 3058 IF_ADDR_LOCK_ASSERT(ifp); 3059 } 3060 3061 ifp = ifma->ifma_ifp; 3062 3063 /* 3064 * If the ifnet is detaching, null out references to ifnet, 3065 * so that upper protocol layers will notice, and not attempt 3066 * to obtain locks for an ifnet which no longer exists. The 3067 * routing socket announcement must happen before the ifnet 3068 * instance is detached from the system. 3069 */ 3070 if (detaching) { 3071#ifdef DIAGNOSTIC 3072 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3073#endif 3074 /* 3075 * ifp may already be nulled out if we are being reentered 3076 * to delete the ll_ifma. 3077 */ 3078 if (ifp != NULL) { 3079 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3080 ifma->ifma_ifp = NULL; 3081 } 3082 } 3083 3084 if (--ifma->ifma_refcount > 0) 3085 return 0; 3086 3087 /* 3088 * If this ifma is a network-layer ifma, a link-layer ifma may 3089 * have been associated with it. Release it first if so. 3090 */ 3091 ll_ifma = ifma->ifma_llifma; 3092 if (ll_ifma != NULL) { 3093 KASSERT(ifma->ifma_lladdr != NULL, 3094 ("%s: llifma w/o lladdr", __func__)); 3095 if (detaching) 3096 ll_ifma->ifma_ifp = NULL; /* XXX */ 3097 if (--ll_ifma->ifma_refcount == 0) { 3098 if (ifp != NULL) { 3099 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3100 ifma_link); 3101 } 3102 if_freemulti(ll_ifma); 3103 } 3104 } 3105 3106 if (ifp != NULL) 3107 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3108 3109 if_freemulti(ifma); 3110 3111 /* 3112 * The last reference to this instance of struct ifmultiaddr 3113 * was released; the hardware should be notified of this change. 3114 */ 3115 return 1; 3116} 3117 3118/* 3119 * Set the link layer address on an interface. 3120 * 3121 * At this time we only support certain types of interfaces, 3122 * and we don't allow the length of the address to change. 3123 */ 3124int 3125if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3126{ 3127 struct sockaddr_dl *sdl; 3128 struct ifaddr *ifa; 3129 struct ifreq ifr; 3130 3131 ifa = ifp->if_addr; 3132 if (ifa == NULL) 3133 return (EINVAL); 3134 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3135 if (sdl == NULL) 3136 return (EINVAL); 3137 if (len != sdl->sdl_alen) /* don't allow length to change */ 3138 return (EINVAL); 3139 switch (ifp->if_type) { 3140 case IFT_ETHER: 3141 case IFT_FDDI: 3142 case IFT_XETHER: 3143 case IFT_ISO88025: 3144 case IFT_L2VLAN: 3145 case IFT_BRIDGE: 3146 case IFT_ARCNET: 3147 case IFT_IEEE8023ADLAG: 3148 case IFT_IEEE80211: 3149 bcopy(lladdr, LLADDR(sdl), len); 3150 break; 3151 default: 3152 return (ENODEV); 3153 } 3154 /* 3155 * If the interface is already up, we need 3156 * to re-init it in order to reprogram its 3157 * address filter. 3158 */ 3159 if ((ifp->if_flags & IFF_UP) != 0) { 3160 if (ifp->if_ioctl) { 3161 ifp->if_flags &= ~IFF_UP; 3162 ifr.ifr_flags = ifp->if_flags & 0xffff; 3163 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3164 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3165 ifp->if_flags |= IFF_UP; 3166 ifr.ifr_flags = ifp->if_flags & 0xffff; 3167 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3168 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3169 } 3170#ifdef INET 3171 /* 3172 * Also send gratuitous ARPs to notify other nodes about 3173 * the address change. 3174 */ 3175 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3176 if (ifa->ifa_addr->sa_family == AF_INET) 3177 arp_ifinit(ifp, ifa); 3178 } 3179#endif 3180 } 3181 return (0); 3182} 3183 3184/* 3185 * The name argument must be a pointer to storage which will last as 3186 * long as the interface does. For physical devices, the result of 3187 * device_get_name(dev) is a good choice and for pseudo-devices a 3188 * static string works well. 3189 */ 3190void 3191if_initname(struct ifnet *ifp, const char *name, int unit) 3192{ 3193 ifp->if_dname = name; 3194 ifp->if_dunit = unit; 3195 if (unit != IF_DUNIT_NONE) 3196 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3197 else 3198 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3199} 3200 3201int 3202if_printf(struct ifnet *ifp, const char * fmt, ...) 3203{ 3204 va_list ap; 3205 int retval; 3206 3207 retval = printf("%s: ", ifp->if_xname); 3208 va_start(ap, fmt); 3209 retval += vprintf(fmt, ap); 3210 va_end(ap); 3211 return (retval); 3212} 3213 3214void 3215if_start(struct ifnet *ifp) 3216{ 3217 3218 (*(ifp)->if_start)(ifp); 3219} 3220 3221/* 3222 * Backwards compatibility interface for drivers 3223 * that have not implemented it 3224 */ 3225static int 3226if_transmit(struct ifnet *ifp, struct mbuf *m) 3227{ 3228 int error; 3229 3230 IFQ_HANDOFF(ifp, m, error); 3231 return (error); 3232} 3233 3234int 3235if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3236{ 3237 int active = 0; 3238 3239 IF_LOCK(ifq); 3240 if (_IF_QFULL(ifq)) { 3241 _IF_DROP(ifq); 3242 IF_UNLOCK(ifq); 3243 m_freem(m); 3244 return (0); 3245 } 3246 if (ifp != NULL) { 3247 ifp->if_obytes += m->m_pkthdr.len + adjust; 3248 if (m->m_flags & (M_BCAST|M_MCAST)) 3249 ifp->if_omcasts++; 3250 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3251 } 3252 _IF_ENQUEUE(ifq, m); 3253 IF_UNLOCK(ifq); 3254 if (ifp != NULL && !active) 3255 (*(ifp)->if_start)(ifp); 3256 return (1); 3257} 3258 3259void 3260if_register_com_alloc(u_char type, 3261 if_com_alloc_t *a, if_com_free_t *f) 3262{ 3263 3264 KASSERT(if_com_alloc[type] == NULL, 3265 ("if_register_com_alloc: %d already registered", type)); 3266 KASSERT(if_com_free[type] == NULL, 3267 ("if_register_com_alloc: %d free already registered", type)); 3268 3269 if_com_alloc[type] = a; 3270 if_com_free[type] = f; 3271} 3272 3273void 3274if_deregister_com_alloc(u_char type) 3275{ 3276 3277 KASSERT(if_com_alloc[type] != NULL, 3278 ("if_deregister_com_alloc: %d not registered", type)); 3279 KASSERT(if_com_free[type] != NULL, 3280 ("if_deregister_com_alloc: %d free not registered", type)); 3281 if_com_alloc[type] = NULL; 3282 if_com_free[type] = NULL; 3283} 3284