if.c revision 168561
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 168561 2007-04-10 00:27:25Z thompsa $ 31 */ 32 33#include "opt_compat.h" 34#include "opt_inet6.h" 35#include "opt_inet.h" 36#include "opt_mac.h" 37#include "opt_carp.h" 38 39#include <sys/param.h> 40#include <sys/types.h> 41#include <sys/conf.h> 42#include <sys/malloc.h> 43#include <sys/sbuf.h> 44#include <sys/bus.h> 45#include <sys/mbuf.h> 46#include <sys/systm.h> 47#include <sys/priv.h> 48#include <sys/proc.h> 49#include <sys/socket.h> 50#include <sys/socketvar.h> 51#include <sys/protosw.h> 52#include <sys/kernel.h> 53#include <sys/sockio.h> 54#include <sys/syslog.h> 55#include <sys/sysctl.h> 56#include <sys/taskqueue.h> 57#include <sys/domain.h> 58#include <sys/jail.h> 59#include <machine/stdarg.h> 60 61#include <net/if.h> 62#include <net/if_clone.h> 63#include <net/if_dl.h> 64#include <net/if_types.h> 65#include <net/if_var.h> 66#include <net/radix.h> 67#include <net/route.h> 68 69#if defined(INET) || defined(INET6) 70/*XXX*/ 71#include <netinet/in.h> 72#include <netinet/in_var.h> 73#ifdef INET6 74#include <netinet6/in6_var.h> 75#include <netinet6/in6_ifattach.h> 76#endif 77#endif 78#ifdef INET 79#include <netinet/if_ether.h> 80#endif 81#ifdef DEV_CARP 82#include <netinet/ip_carp.h> 83#endif 84 85#include <security/mac/mac_framework.h> 86 87SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 88SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 89 90/* Log link state change events */ 91static int log_link_state_change = 1; 92 93SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 94 &log_link_state_change, 0, 95 "log interface link state change events"); 96 97void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 98void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 99void (*trunk_linkstate_p)(struct ifnet *ifp, int state); 100 101struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 102 103/* 104 * XXX: Style; these should be sorted alphabetically, and unprototyped 105 * static functions should be prototyped. Currently they are sorted by 106 * declaration order. 107 */ 108static void if_attachdomain(void *); 109static void if_attachdomain1(struct ifnet *); 110static void if_purgemaddrs(struct ifnet *); 111static int ifconf(u_long, caddr_t); 112static void if_freemulti(struct ifmultiaddr *); 113static void if_grow(void); 114static void if_init(void *); 115static void if_check(void *); 116static void if_qflush(struct ifaltq *); 117static void if_route(struct ifnet *, int flag, int fam); 118static int if_setflag(struct ifnet *, int, int, int *, int); 119static void if_slowtimo(void *); 120static void if_unroute(struct ifnet *, int flag, int fam); 121static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 122static int if_rtdel(struct radix_node *, void *); 123static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 124static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 125static void if_start_deferred(void *context, int pending); 126static void do_link_state_change(void *, int); 127static int if_getgroup(struct ifgroupreq *, struct ifnet *); 128static int if_getgroupmembers(struct ifgroupreq *); 129#ifdef INET6 130/* 131 * XXX: declare here to avoid to include many inet6 related files.. 132 * should be more generalized? 133 */ 134extern void nd6_setmtu(struct ifnet *); 135#endif 136 137int if_index = 0; 138struct ifindex_entry *ifindex_table = NULL; 139int ifqmaxlen = IFQ_MAXLEN; 140struct ifnethead ifnet; /* depend on static init XXX */ 141struct ifgrouphead ifg_head; 142struct mtx ifnet_lock; 143static if_com_alloc_t *if_com_alloc[256]; 144static if_com_free_t *if_com_free[256]; 145 146static int if_indexlim = 8; 147static struct knlist ifklist; 148 149static void filt_netdetach(struct knote *kn); 150static int filt_netdev(struct knote *kn, long hint); 151 152static struct filterops netdev_filtops = 153 { 1, NULL, filt_netdetach, filt_netdev }; 154 155/* 156 * System initialization 157 */ 158SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 159SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 160 161MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 162MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 163MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 164 165static d_open_t netopen; 166static d_close_t netclose; 167static d_ioctl_t netioctl; 168static d_kqfilter_t netkqfilter; 169 170static struct cdevsw net_cdevsw = { 171 .d_version = D_VERSION, 172 .d_flags = D_NEEDGIANT, 173 .d_open = netopen, 174 .d_close = netclose, 175 .d_ioctl = netioctl, 176 .d_name = "net", 177 .d_kqfilter = netkqfilter, 178}; 179 180static int 181netopen(struct cdev *dev, int flag, int mode, struct thread *td) 182{ 183 return (0); 184} 185 186static int 187netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 188{ 189 return (0); 190} 191 192static int 193netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 194{ 195 struct ifnet *ifp; 196 int error, idx; 197 198 /* only support interface specific ioctls */ 199 if (IOCGROUP(cmd) != 'i') 200 return (EOPNOTSUPP); 201 idx = minor(dev); 202 if (idx == 0) { 203 /* 204 * special network device, not interface. 205 */ 206 if (cmd == SIOCGIFCONF) 207 return (ifconf(cmd, data)); /* XXX remove cmd */ 208#ifdef __amd64__ 209 if (cmd == SIOCGIFCONF32) 210 return (ifconf(cmd, data)); /* XXX remove cmd */ 211#endif 212 return (EOPNOTSUPP); 213 } 214 215 ifp = ifnet_byindex(idx); 216 if (ifp == NULL) 217 return (ENXIO); 218 219 error = ifhwioctl(cmd, ifp, data, td); 220 if (error == ENOIOCTL) 221 error = EOPNOTSUPP; 222 return (error); 223} 224 225static int 226netkqfilter(struct cdev *dev, struct knote *kn) 227{ 228 struct knlist *klist; 229 struct ifnet *ifp; 230 int idx; 231 232 switch (kn->kn_filter) { 233 case EVFILT_NETDEV: 234 kn->kn_fop = &netdev_filtops; 235 break; 236 default: 237 return (EINVAL); 238 } 239 240 idx = minor(dev); 241 if (idx == 0) { 242 klist = &ifklist; 243 } else { 244 ifp = ifnet_byindex(idx); 245 if (ifp == NULL) 246 return (1); 247 klist = &ifp->if_klist; 248 } 249 250 kn->kn_hook = (caddr_t)klist; 251 252 knlist_add(klist, kn, 0); 253 254 return (0); 255} 256 257static void 258filt_netdetach(struct knote *kn) 259{ 260 struct knlist *klist = (struct knlist *)kn->kn_hook; 261 262 knlist_remove(klist, kn, 0); 263} 264 265static int 266filt_netdev(struct knote *kn, long hint) 267{ 268 struct knlist *klist = (struct knlist *)kn->kn_hook; 269 270 /* 271 * Currently NOTE_EXIT is abused to indicate device detach. 272 */ 273 if (hint == NOTE_EXIT) { 274 kn->kn_data = NOTE_LINKINV; 275 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 276 knlist_remove_inevent(klist, kn); 277 return (1); 278 } 279 if (hint != 0) 280 kn->kn_data = hint; /* current status */ 281 if (kn->kn_sfflags & hint) 282 kn->kn_fflags |= hint; 283 return (kn->kn_fflags != 0); 284} 285 286/* 287 * Network interface utility routines. 288 * 289 * Routines with ifa_ifwith* names take sockaddr *'s as 290 * parameters. 291 */ 292/* ARGSUSED*/ 293static void 294if_init(void *dummy __unused) 295{ 296 297 IFNET_LOCK_INIT(); 298 TAILQ_INIT(&ifnet); 299 TAILQ_INIT(&ifg_head); 300 knlist_init(&ifklist, NULL, NULL, NULL, NULL); 301 if_grow(); /* create initial table */ 302 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 303 UID_ROOT, GID_WHEEL, 0600, "network"); 304 if_clone_init(); 305} 306 307static void 308if_grow(void) 309{ 310 u_int n; 311 struct ifindex_entry *e; 312 313 if_indexlim <<= 1; 314 n = if_indexlim * sizeof(*e); 315 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 316 if (ifindex_table != NULL) { 317 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 318 free((caddr_t)ifindex_table, M_IFNET); 319 } 320 ifindex_table = e; 321} 322 323/* ARGSUSED*/ 324static void 325if_check(void *dummy __unused) 326{ 327 struct ifnet *ifp; 328 int s; 329 330 s = splimp(); 331 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 332 TAILQ_FOREACH(ifp, &ifnet, if_link) { 333 if (ifp->if_snd.ifq_maxlen == 0) { 334 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 335 ifp->if_snd.ifq_maxlen = ifqmaxlen; 336 } 337 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 338 if_printf(ifp, 339 "XXX: driver didn't initialize queue mtx\n"); 340 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 341 MTX_NETWORK_LOCK, MTX_DEF); 342 } 343 } 344 IFNET_RUNLOCK(); 345 splx(s); 346 if_slowtimo(0); 347} 348 349/* 350 * Allocate a struct ifnet and in index for an interface. 351 */ 352struct ifnet* 353if_alloc(u_char type) 354{ 355 struct ifnet *ifp; 356 357 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 358 359 /* 360 * Try to find an empty slot below if_index. If we fail, take 361 * the next slot. 362 * 363 * XXX: should be locked! 364 */ 365 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) { 366 if (ifnet_byindex(ifp->if_index) == NULL) 367 break; 368 } 369 /* Catch if_index overflow. */ 370 if (ifp->if_index < 1) { 371 free(ifp, M_IFNET); 372 return (NULL); 373 } 374 if (ifp->if_index > if_index) 375 if_index = ifp->if_index; 376 if (if_index >= if_indexlim) 377 if_grow(); 378 ifnet_byindex(ifp->if_index) = ifp; 379 380 ifp->if_type = type; 381 382 if (if_com_alloc[type] != NULL) { 383 ifp->if_l2com = if_com_alloc[type](type, ifp); 384 if (ifp->if_l2com == NULL) { 385 free(ifp, M_IFNET); 386 return (NULL); 387 } 388 } 389 IF_ADDR_LOCK_INIT(ifp); 390 391 return (ifp); 392} 393 394void 395if_free(struct ifnet *ifp) 396{ 397 398 /* Do not add code to this function! Add it to if_free_type(). */ 399 if_free_type(ifp, ifp->if_type); 400} 401 402void 403if_free_type(struct ifnet *ifp, u_char type) 404{ 405 406 if (ifp != ifnet_byindex(ifp->if_index)) { 407 if_printf(ifp, "%s: value was not if_alloced, skipping\n", 408 __func__); 409 return; 410 } 411 412 IF_ADDR_LOCK_DESTROY(ifp); 413 414 ifnet_byindex(ifp->if_index) = NULL; 415 416 /* XXX: should be locked with if_findindex() */ 417 while (if_index > 0 && ifnet_byindex(if_index) == NULL) 418 if_index--; 419 420 if (if_com_free[type] != NULL) 421 if_com_free[type](ifp->if_l2com, type); 422 423 free(ifp, M_IFNET); 424}; 425 426/* 427 * Attach an interface to the 428 * list of "active" interfaces. 429 */ 430void 431if_attach(struct ifnet *ifp) 432{ 433 unsigned socksize, ifasize; 434 int namelen, masklen; 435 struct sockaddr_dl *sdl; 436 struct ifaddr *ifa; 437 438 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 439 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 440 ifp->if_xname); 441 442 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 443 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 444 IF_AFDATA_LOCK_INIT(ifp); 445 ifp->if_afdata_initialized = 0; 446 /* 447 * XXX - 448 * The old code would work if the interface passed a pre-existing 449 * chain of ifaddrs to this code. We don't trust our callers to 450 * properly initialize the tailq, however, so we no longer allow 451 * this unlikely case. 452 */ 453 TAILQ_INIT(&ifp->if_addrhead); 454 TAILQ_INIT(&ifp->if_prefixhead); 455 TAILQ_INIT(&ifp->if_multiaddrs); 456 TAILQ_INIT(&ifp->if_groups); 457 458 if_addgroup(ifp, IFG_ALL); 459 460 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL); 461 getmicrotime(&ifp->if_lastchange); 462 ifp->if_data.ifi_epoch = time_uptime; 463 ifp->if_data.ifi_datalen = sizeof(struct if_data); 464 465#ifdef MAC 466 mac_init_ifnet(ifp); 467 mac_create_ifnet(ifp); 468#endif 469 470 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 471 unit2minor(ifp->if_index), 472 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 473 net_cdevsw.d_name, ifp->if_xname); 474 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 475 net_cdevsw.d_name, ifp->if_index); 476 477 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 478 479 /* 480 * create a Link Level name for this device 481 */ 482 namelen = strlen(ifp->if_xname); 483 /* 484 * Always save enough space for any possiable name so we can do 485 * a rename in place later. 486 */ 487 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 488 socksize = masklen + ifp->if_addrlen; 489 if (socksize < sizeof(*sdl)) 490 socksize = sizeof(*sdl); 491 socksize = roundup2(socksize, sizeof(long)); 492 ifasize = sizeof(*ifa) + 2 * socksize; 493 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 494 IFA_LOCK_INIT(ifa); 495 sdl = (struct sockaddr_dl *)(ifa + 1); 496 sdl->sdl_len = socksize; 497 sdl->sdl_family = AF_LINK; 498 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 499 sdl->sdl_nlen = namelen; 500 sdl->sdl_index = ifp->if_index; 501 sdl->sdl_type = ifp->if_type; 502 ifp->if_addr = ifa; 503 ifa->ifa_ifp = ifp; 504 ifa->ifa_rtrequest = link_rtrequest; 505 ifa->ifa_addr = (struct sockaddr *)sdl; 506 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 507 ifa->ifa_netmask = (struct sockaddr *)sdl; 508 sdl->sdl_len = masklen; 509 while (namelen != 0) 510 sdl->sdl_data[--namelen] = 0xff; 511 ifa->ifa_refcnt = 1; 512 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 513 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 514 ifp->if_snd.altq_type = 0; 515 ifp->if_snd.altq_disc = NULL; 516 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 517 ifp->if_snd.altq_tbr = NULL; 518 ifp->if_snd.altq_ifp = ifp; 519 520 IFNET_WLOCK(); 521 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 522 IFNET_WUNLOCK(); 523 524 if (domain_init_status >= 2) 525 if_attachdomain1(ifp); 526 527 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 528 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 529 530 /* Announce the interface. */ 531 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 532 533 if (ifp->if_watchdog != NULL) 534 if_printf(ifp, "using obsoleted if_watchdog interface\n"); 535} 536 537static void 538if_attachdomain(void *dummy) 539{ 540 struct ifnet *ifp; 541 int s; 542 543 s = splnet(); 544 TAILQ_FOREACH(ifp, &ifnet, if_link) 545 if_attachdomain1(ifp); 546 splx(s); 547} 548SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 549 if_attachdomain, NULL); 550 551static void 552if_attachdomain1(struct ifnet *ifp) 553{ 554 struct domain *dp; 555 int s; 556 557 s = splnet(); 558 559 /* 560 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 561 * cannot lock ifp->if_afdata initialization, entirely. 562 */ 563 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 564 splx(s); 565 return; 566 } 567 if (ifp->if_afdata_initialized >= domain_init_status) { 568 IF_AFDATA_UNLOCK(ifp); 569 splx(s); 570 printf("if_attachdomain called more than once on %s\n", 571 ifp->if_xname); 572 return; 573 } 574 ifp->if_afdata_initialized = domain_init_status; 575 IF_AFDATA_UNLOCK(ifp); 576 577 /* address family dependent data region */ 578 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 579 for (dp = domains; dp; dp = dp->dom_next) { 580 if (dp->dom_ifattach) 581 ifp->if_afdata[dp->dom_family] = 582 (*dp->dom_ifattach)(ifp); 583 } 584 585 splx(s); 586} 587 588/* 589 * Remove any unicast or broadcast network addresses from an interface. 590 */ 591 592void 593if_purgeaddrs(struct ifnet *ifp) 594{ 595 struct ifaddr *ifa, *next; 596 597 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 598 if (ifa->ifa_addr->sa_family == AF_LINK) 599 continue; 600#ifdef INET 601 /* XXX: Ugly!! ad hoc just for INET */ 602 if (ifa->ifa_addr->sa_family == AF_INET) { 603 struct ifaliasreq ifr; 604 605 bzero(&ifr, sizeof(ifr)); 606 ifr.ifra_addr = *ifa->ifa_addr; 607 if (ifa->ifa_dstaddr) 608 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 609 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 610 NULL) == 0) 611 continue; 612 } 613#endif /* INET */ 614#ifdef INET6 615 if (ifa->ifa_addr->sa_family == AF_INET6) { 616 in6_purgeaddr(ifa); 617 /* ifp_addrhead is already updated */ 618 continue; 619 } 620#endif /* INET6 */ 621 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 622 IFAFREE(ifa); 623 } 624} 625 626/* 627 * Remove any multicast network addresses from an interface. 628 */ 629static void 630if_purgemaddrs(struct ifnet *ifp) 631{ 632 struct ifmultiaddr *ifma; 633 struct ifmultiaddr *next; 634 635 IF_ADDR_LOCK(ifp); 636 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 637 if_delmulti_locked(ifp, ifma, 1); 638 IF_ADDR_UNLOCK(ifp); 639} 640 641/* 642 * Detach an interface, removing it from the 643 * list of "active" interfaces. 644 * 645 * XXXRW: There are some significant questions about event ordering, and 646 * how to prevent things from starting to use the interface during detach. 647 */ 648void 649if_detach(struct ifnet *ifp) 650{ 651 struct ifaddr *ifa; 652 struct radix_node_head *rnh; 653 int s; 654 int i; 655 struct domain *dp; 656 struct ifnet *iter; 657 int found = 0; 658 659 IFNET_WLOCK(); 660 TAILQ_FOREACH(iter, &ifnet, if_link) 661 if (iter == ifp) { 662 TAILQ_REMOVE(&ifnet, ifp, if_link); 663 found = 1; 664 break; 665 } 666 IFNET_WUNLOCK(); 667 if (!found) 668 return; 669 670 /* 671 * Remove/wait for pending events. 672 */ 673 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 674 675 /* 676 * Remove routes and flush queues. 677 */ 678 s = splnet(); 679 if_down(ifp); 680#ifdef ALTQ 681 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 682 altq_disable(&ifp->if_snd); 683 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 684 altq_detach(&ifp->if_snd); 685#endif 686 687 if_purgeaddrs(ifp); 688 689#ifdef INET 690 in_ifdetach(ifp); 691#endif 692 693#ifdef INET6 694 /* 695 * Remove all IPv6 kernel structs related to ifp. This should be done 696 * before removing routing entries below, since IPv6 interface direct 697 * routes are expected to be removed by the IPv6-specific kernel API. 698 * Otherwise, the kernel will detect some inconsistency and bark it. 699 */ 700 in6_ifdetach(ifp); 701#endif 702 if_purgemaddrs(ifp); 703 704 /* 705 * Remove link ifaddr pointer and maybe decrement if_index. 706 * Clean up all addresses. 707 */ 708 ifp->if_addr = NULL; 709 destroy_dev(ifdev_byindex(ifp->if_index)); 710 ifdev_byindex(ifp->if_index) = NULL; 711 712 /* We can now free link ifaddr. */ 713 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 714 ifa = TAILQ_FIRST(&ifp->if_addrhead); 715 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 716 IFAFREE(ifa); 717 } 718 719 /* 720 * Delete all remaining routes using this interface 721 * Unfortuneatly the only way to do this is to slog through 722 * the entire routing table looking for routes which point 723 * to this interface...oh well... 724 */ 725 for (i = 1; i <= AF_MAX; i++) { 726 if ((rnh = rt_tables[i]) == NULL) 727 continue; 728 RADIX_NODE_HEAD_LOCK(rnh); 729 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 730 RADIX_NODE_HEAD_UNLOCK(rnh); 731 } 732 733 /* Announce that the interface is gone. */ 734 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 735 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 736 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 737 738 IF_AFDATA_LOCK(ifp); 739 for (dp = domains; dp; dp = dp->dom_next) { 740 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 741 (*dp->dom_ifdetach)(ifp, 742 ifp->if_afdata[dp->dom_family]); 743 } 744 IF_AFDATA_UNLOCK(ifp); 745 746#ifdef MAC 747 mac_destroy_ifnet(ifp); 748#endif /* MAC */ 749 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 750 knlist_clear(&ifp->if_klist, 0); 751 knlist_destroy(&ifp->if_klist); 752 mtx_destroy(&ifp->if_snd.ifq_mtx); 753 IF_AFDATA_DESTROY(ifp); 754 splx(s); 755} 756 757/* 758 * Add a group to an interface 759 */ 760int 761if_addgroup(struct ifnet *ifp, const char *groupname) 762{ 763 struct ifg_list *ifgl; 764 struct ifg_group *ifg = NULL; 765 struct ifg_member *ifgm; 766 767 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 768 groupname[strlen(groupname) - 1] <= '9') 769 return (EINVAL); 770 771 IFNET_WLOCK(); 772 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 773 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 774 IFNET_WUNLOCK(); 775 return (EEXIST); 776 } 777 778 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 779 M_NOWAIT)) == NULL) { 780 IFNET_WUNLOCK(); 781 return (ENOMEM); 782 } 783 784 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 785 M_TEMP, M_NOWAIT)) == NULL) { 786 free(ifgl, M_TEMP); 787 IFNET_WUNLOCK(); 788 return (ENOMEM); 789 } 790 791 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 792 if (!strcmp(ifg->ifg_group, groupname)) 793 break; 794 795 if (ifg == NULL) { 796 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 797 M_TEMP, M_NOWAIT)) == NULL) { 798 free(ifgl, M_TEMP); 799 free(ifgm, M_TEMP); 800 IFNET_WUNLOCK(); 801 return (ENOMEM); 802 } 803 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 804 ifg->ifg_refcnt = 0; 805 TAILQ_INIT(&ifg->ifg_members); 806 EVENTHANDLER_INVOKE(group_attach_event, ifg); 807 TAILQ_INSERT_TAIL(&ifg_head, ifg, ifg_next); 808 } 809 810 ifg->ifg_refcnt++; 811 ifgl->ifgl_group = ifg; 812 ifgm->ifgm_ifp = ifp; 813 814 IF_ADDR_LOCK(ifp); 815 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 816 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 817 IF_ADDR_UNLOCK(ifp); 818 819 IFNET_WUNLOCK(); 820 821 EVENTHANDLER_INVOKE(group_change_event, groupname); 822 823 return (0); 824} 825 826/* 827 * Remove a group from an interface 828 */ 829int 830if_delgroup(struct ifnet *ifp, const char *groupname) 831{ 832 struct ifg_list *ifgl; 833 struct ifg_member *ifgm; 834 835 IFNET_WLOCK(); 836 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 837 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 838 break; 839 if (ifgl == NULL) { 840 IFNET_WUNLOCK(); 841 return (ENOENT); 842 } 843 844 IF_ADDR_LOCK(ifp); 845 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 846 IF_ADDR_UNLOCK(ifp); 847 848 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 849 if (ifgm->ifgm_ifp == ifp) 850 break; 851 852 if (ifgm != NULL) { 853 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 854 free(ifgm, M_TEMP); 855 } 856 857 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 858 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next); 859 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 860 free(ifgl->ifgl_group, M_TEMP); 861 } 862 IFNET_WUNLOCK(); 863 864 free(ifgl, M_TEMP); 865 866 EVENTHANDLER_INVOKE(group_change_event, groupname); 867 868 return (0); 869} 870 871/* 872 * Stores all groups from an interface in memory pointed 873 * to by data 874 */ 875static int 876if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 877{ 878 int len, error; 879 struct ifg_list *ifgl; 880 struct ifg_req ifgrq, *ifgp; 881 struct ifgroupreq *ifgr = data; 882 883 if (ifgr->ifgr_len == 0) { 884 IF_ADDR_LOCK(ifp); 885 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 886 ifgr->ifgr_len += sizeof(struct ifg_req); 887 IF_ADDR_UNLOCK(ifp); 888 return (0); 889 } 890 891 len = ifgr->ifgr_len; 892 ifgp = ifgr->ifgr_groups; 893 /* XXX: wire */ 894 IF_ADDR_LOCK(ifp); 895 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 896 if (len < sizeof(ifgrq)) { 897 IF_ADDR_UNLOCK(ifp); 898 return (EINVAL); 899 } 900 bzero(&ifgrq, sizeof ifgrq); 901 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 902 sizeof(ifgrq.ifgrq_group)); 903 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 904 IF_ADDR_UNLOCK(ifp); 905 return (error); 906 } 907 len -= sizeof(ifgrq); 908 ifgp++; 909 } 910 IF_ADDR_UNLOCK(ifp); 911 912 return (0); 913} 914 915/* 916 * Stores all members of a group in memory pointed to by data 917 */ 918static int 919if_getgroupmembers(struct ifgroupreq *data) 920{ 921 struct ifgroupreq *ifgr = data; 922 struct ifg_group *ifg; 923 struct ifg_member *ifgm; 924 struct ifg_req ifgrq, *ifgp; 925 int len, error; 926 927 IFNET_RLOCK(); 928 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 929 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 930 break; 931 if (ifg == NULL) { 932 IFNET_RUNLOCK(); 933 return (ENOENT); 934 } 935 936 if (ifgr->ifgr_len == 0) { 937 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 938 ifgr->ifgr_len += sizeof(ifgrq); 939 IFNET_RUNLOCK(); 940 return (0); 941 } 942 943 len = ifgr->ifgr_len; 944 ifgp = ifgr->ifgr_groups; 945 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 946 if (len < sizeof(ifgrq)) { 947 IFNET_RUNLOCK(); 948 return (EINVAL); 949 } 950 bzero(&ifgrq, sizeof ifgrq); 951 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 952 sizeof(ifgrq.ifgrq_member)); 953 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 954 IFNET_RUNLOCK(); 955 return (error); 956 } 957 len -= sizeof(ifgrq); 958 ifgp++; 959 } 960 IFNET_RUNLOCK(); 961 962 return (0); 963} 964 965/* 966 * Delete Routes for a Network Interface 967 * 968 * Called for each routing entry via the rnh->rnh_walktree() call above 969 * to delete all route entries referencing a detaching network interface. 970 * 971 * Arguments: 972 * rn pointer to node in the routing table 973 * arg argument passed to rnh->rnh_walktree() - detaching interface 974 * 975 * Returns: 976 * 0 successful 977 * errno failed - reason indicated 978 * 979 */ 980static int 981if_rtdel(struct radix_node *rn, void *arg) 982{ 983 struct rtentry *rt = (struct rtentry *)rn; 984 struct ifnet *ifp = arg; 985 int err; 986 987 if (rt->rt_ifp == ifp) { 988 989 /* 990 * Protect (sorta) against walktree recursion problems 991 * with cloned routes 992 */ 993 if ((rt->rt_flags & RTF_UP) == 0) 994 return (0); 995 996 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 997 rt_mask(rt), rt->rt_flags, 998 (struct rtentry **) NULL); 999 if (err) { 1000 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1001 } 1002 } 1003 1004 return (0); 1005} 1006 1007/* 1008 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1009 * structs used to represent other address families, it is necessary 1010 * to perform a different comparison. 1011 */ 1012 1013#define sa_equal(a1, a2) \ 1014 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1015 1016#define sa_dl_equal(a1, a2) \ 1017 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1018 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1019 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1020 LLADDR((struct sockaddr_dl *)(a2)), \ 1021 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1022 1023/* 1024 * Locate an interface based on a complete address. 1025 */ 1026/*ARGSUSED*/ 1027struct ifaddr * 1028ifa_ifwithaddr(struct sockaddr *addr) 1029{ 1030 struct ifnet *ifp; 1031 struct ifaddr *ifa; 1032 1033 IFNET_RLOCK(); 1034 TAILQ_FOREACH(ifp, &ifnet, if_link) 1035 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1036 if (ifa->ifa_addr->sa_family != addr->sa_family) 1037 continue; 1038 if (sa_equal(addr, ifa->ifa_addr)) 1039 goto done; 1040 /* IP6 doesn't have broadcast */ 1041 if ((ifp->if_flags & IFF_BROADCAST) && 1042 ifa->ifa_broadaddr && 1043 ifa->ifa_broadaddr->sa_len != 0 && 1044 sa_equal(ifa->ifa_broadaddr, addr)) 1045 goto done; 1046 } 1047 ifa = NULL; 1048done: 1049 IFNET_RUNLOCK(); 1050 return (ifa); 1051} 1052 1053/* 1054 * Locate an interface based on the broadcast address. 1055 */ 1056/* ARGSUSED */ 1057struct ifaddr * 1058ifa_ifwithbroadaddr(struct sockaddr *addr) 1059{ 1060 struct ifnet *ifp; 1061 struct ifaddr *ifa; 1062 1063 IFNET_RLOCK(); 1064 TAILQ_FOREACH(ifp, &ifnet, if_link) 1065 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1066 if (ifa->ifa_addr->sa_family != addr->sa_family) 1067 continue; 1068 if ((ifp->if_flags & IFF_BROADCAST) && 1069 ifa->ifa_broadaddr && 1070 ifa->ifa_broadaddr->sa_len != 0 && 1071 sa_equal(ifa->ifa_broadaddr, addr)) 1072 goto done; 1073 } 1074 ifa = NULL; 1075done: 1076 IFNET_RUNLOCK(); 1077 return (ifa); 1078} 1079 1080/* 1081 * Locate the point to point interface with a given destination address. 1082 */ 1083/*ARGSUSED*/ 1084struct ifaddr * 1085ifa_ifwithdstaddr(struct sockaddr *addr) 1086{ 1087 struct ifnet *ifp; 1088 struct ifaddr *ifa; 1089 1090 IFNET_RLOCK(); 1091 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1092 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1093 continue; 1094 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1095 if (ifa->ifa_addr->sa_family != addr->sa_family) 1096 continue; 1097 if (ifa->ifa_dstaddr && 1098 sa_equal(addr, ifa->ifa_dstaddr)) 1099 goto done; 1100 } 1101 } 1102 ifa = NULL; 1103done: 1104 IFNET_RUNLOCK(); 1105 return (ifa); 1106} 1107 1108/* 1109 * Find an interface on a specific network. If many, choice 1110 * is most specific found. 1111 */ 1112struct ifaddr * 1113ifa_ifwithnet(struct sockaddr *addr) 1114{ 1115 struct ifnet *ifp; 1116 struct ifaddr *ifa; 1117 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 1118 u_int af = addr->sa_family; 1119 char *addr_data = addr->sa_data, *cplim; 1120 1121 /* 1122 * AF_LINK addresses can be looked up directly by their index number, 1123 * so do that if we can. 1124 */ 1125 if (af == AF_LINK) { 1126 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1127 if (sdl->sdl_index && sdl->sdl_index <= if_index) 1128 return (ifaddr_byindex(sdl->sdl_index)); 1129 } 1130 1131 /* 1132 * Scan though each interface, looking for ones that have 1133 * addresses in this address family. 1134 */ 1135 IFNET_RLOCK(); 1136 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1137 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1138 char *cp, *cp2, *cp3; 1139 1140 if (ifa->ifa_addr->sa_family != af) 1141next: continue; 1142 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 1143 /* 1144 * This is a bit broken as it doesn't 1145 * take into account that the remote end may 1146 * be a single node in the network we are 1147 * looking for. 1148 * The trouble is that we don't know the 1149 * netmask for the remote end. 1150 */ 1151 if (ifa->ifa_dstaddr != 0 && 1152 sa_equal(addr, ifa->ifa_dstaddr)) 1153 goto done; 1154 } else { 1155 /* 1156 * if we have a special address handler, 1157 * then use it instead of the generic one. 1158 */ 1159 if (ifa->ifa_claim_addr) { 1160 if ((*ifa->ifa_claim_addr)(ifa, addr)) 1161 goto done; 1162 continue; 1163 } 1164 1165 /* 1166 * Scan all the bits in the ifa's address. 1167 * If a bit dissagrees with what we are 1168 * looking for, mask it with the netmask 1169 * to see if it really matters. 1170 * (A byte at a time) 1171 */ 1172 if (ifa->ifa_netmask == 0) 1173 continue; 1174 cp = addr_data; 1175 cp2 = ifa->ifa_addr->sa_data; 1176 cp3 = ifa->ifa_netmask->sa_data; 1177 cplim = ifa->ifa_netmask->sa_len 1178 + (char *)ifa->ifa_netmask; 1179 while (cp3 < cplim) 1180 if ((*cp++ ^ *cp2++) & *cp3++) 1181 goto next; /* next address! */ 1182 /* 1183 * If the netmask of what we just found 1184 * is more specific than what we had before 1185 * (if we had one) then remember the new one 1186 * before continuing to search 1187 * for an even better one. 1188 */ 1189 if (ifa_maybe == 0 || 1190 rn_refines((caddr_t)ifa->ifa_netmask, 1191 (caddr_t)ifa_maybe->ifa_netmask)) 1192 ifa_maybe = ifa; 1193 } 1194 } 1195 } 1196 ifa = ifa_maybe; 1197done: 1198 IFNET_RUNLOCK(); 1199 return (ifa); 1200} 1201 1202/* 1203 * Find an interface address specific to an interface best matching 1204 * a given address. 1205 */ 1206struct ifaddr * 1207ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1208{ 1209 struct ifaddr *ifa; 1210 char *cp, *cp2, *cp3; 1211 char *cplim; 1212 struct ifaddr *ifa_maybe = 0; 1213 u_int af = addr->sa_family; 1214 1215 if (af >= AF_MAX) 1216 return (0); 1217 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1218 if (ifa->ifa_addr->sa_family != af) 1219 continue; 1220 if (ifa_maybe == 0) 1221 ifa_maybe = ifa; 1222 if (ifa->ifa_netmask == 0) { 1223 if (sa_equal(addr, ifa->ifa_addr) || 1224 (ifa->ifa_dstaddr && 1225 sa_equal(addr, ifa->ifa_dstaddr))) 1226 goto done; 1227 continue; 1228 } 1229 if (ifp->if_flags & IFF_POINTOPOINT) { 1230 if (sa_equal(addr, ifa->ifa_dstaddr)) 1231 goto done; 1232 } else { 1233 cp = addr->sa_data; 1234 cp2 = ifa->ifa_addr->sa_data; 1235 cp3 = ifa->ifa_netmask->sa_data; 1236 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1237 for (; cp3 < cplim; cp3++) 1238 if ((*cp++ ^ *cp2++) & *cp3) 1239 break; 1240 if (cp3 == cplim) 1241 goto done; 1242 } 1243 } 1244 ifa = ifa_maybe; 1245done: 1246 return (ifa); 1247} 1248 1249#include <net/route.h> 1250 1251/* 1252 * Default action when installing a route with a Link Level gateway. 1253 * Lookup an appropriate real ifa to point to. 1254 * This should be moved to /sys/net/link.c eventually. 1255 */ 1256static void 1257link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1258{ 1259 struct ifaddr *ifa, *oifa; 1260 struct sockaddr *dst; 1261 struct ifnet *ifp; 1262 1263 RT_LOCK_ASSERT(rt); 1264 1265 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1266 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1267 return; 1268 ifa = ifaof_ifpforaddr(dst, ifp); 1269 if (ifa) { 1270 IFAREF(ifa); /* XXX */ 1271 oifa = rt->rt_ifa; 1272 rt->rt_ifa = ifa; 1273 IFAFREE(oifa); 1274 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1275 ifa->ifa_rtrequest(cmd, rt, info); 1276 } 1277} 1278 1279/* 1280 * Mark an interface down and notify protocols of 1281 * the transition. 1282 * NOTE: must be called at splnet or eqivalent. 1283 */ 1284static void 1285if_unroute(struct ifnet *ifp, int flag, int fam) 1286{ 1287 struct ifaddr *ifa; 1288 1289 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1290 1291 ifp->if_flags &= ~flag; 1292 getmicrotime(&ifp->if_lastchange); 1293 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1294 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1295 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1296 if_qflush(&ifp->if_snd); 1297#ifdef DEV_CARP 1298 if (ifp->if_carp) 1299 carp_carpdev_state(ifp->if_carp); 1300#endif 1301 rt_ifmsg(ifp); 1302} 1303 1304/* 1305 * Mark an interface up and notify protocols of 1306 * the transition. 1307 * NOTE: must be called at splnet or eqivalent. 1308 */ 1309static void 1310if_route(struct ifnet *ifp, int flag, int fam) 1311{ 1312 struct ifaddr *ifa; 1313 1314 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1315 1316 ifp->if_flags |= flag; 1317 getmicrotime(&ifp->if_lastchange); 1318 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1319 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1320 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1321#ifdef DEV_CARP 1322 if (ifp->if_carp) 1323 carp_carpdev_state(ifp->if_carp); 1324#endif 1325 rt_ifmsg(ifp); 1326#ifdef INET6 1327 in6_if_up(ifp); 1328#endif 1329} 1330 1331void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 1332void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1333 1334/* 1335 * Handle a change in the interface link state. To avoid LORs 1336 * between driver lock and upper layer locks, as well as possible 1337 * recursions, we post event to taskqueue, and all job 1338 * is done in static do_link_state_change(). 1339 */ 1340void 1341if_link_state_change(struct ifnet *ifp, int link_state) 1342{ 1343 /* Return if state hasn't changed. */ 1344 if (ifp->if_link_state == link_state) 1345 return; 1346 1347 ifp->if_link_state = link_state; 1348 1349 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1350} 1351 1352static void 1353do_link_state_change(void *arg, int pending) 1354{ 1355 struct ifnet *ifp = (struct ifnet *)arg; 1356 int link_state = ifp->if_link_state; 1357 int link; 1358 1359 /* Notify that the link state has changed. */ 1360 rt_ifmsg(ifp); 1361 if (link_state == LINK_STATE_UP) 1362 link = NOTE_LINKUP; 1363 else if (link_state == LINK_STATE_DOWN) 1364 link = NOTE_LINKDOWN; 1365 else 1366 link = NOTE_LINKINV; 1367 KNOTE_UNLOCKED(&ifp->if_klist, link); 1368 if (ifp->if_vlantrunk != NULL) 1369 (*vlan_link_state_p)(ifp, link); 1370 1371 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1372 IFP2AC(ifp)->ac_netgraph != NULL) 1373 (*ng_ether_link_state_p)(ifp, link_state); 1374#ifdef DEV_CARP 1375 if (ifp->if_carp) 1376 carp_carpdev_state(ifp->if_carp); 1377#endif 1378 if (ifp->if_bridge) { 1379 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1380 (*bstp_linkstate_p)(ifp, link_state); 1381 } 1382 if (ifp->if_trunk) { 1383 KASSERT(trunk_linkstate_p != NULL,("if_trunk not loaded!")); 1384 (*trunk_linkstate_p)(ifp, link_state); 1385 } 1386 1387 devctl_notify("IFNET", ifp->if_xname, 1388 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1389 if (pending > 1) 1390 if_printf(ifp, "%d link states coalesced\n", pending); 1391 if (log_link_state_change) 1392 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1393 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1394} 1395 1396/* 1397 * Mark an interface down and notify protocols of 1398 * the transition. 1399 * NOTE: must be called at splnet or eqivalent. 1400 */ 1401void 1402if_down(struct ifnet *ifp) 1403{ 1404 1405 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1406} 1407 1408/* 1409 * Mark an interface up and notify protocols of 1410 * the transition. 1411 * NOTE: must be called at splnet or eqivalent. 1412 */ 1413void 1414if_up(struct ifnet *ifp) 1415{ 1416 1417 if_route(ifp, IFF_UP, AF_UNSPEC); 1418} 1419 1420/* 1421 * Flush an interface queue. 1422 */ 1423static void 1424if_qflush(struct ifaltq *ifq) 1425{ 1426 struct mbuf *m, *n; 1427 1428 IFQ_LOCK(ifq); 1429#ifdef ALTQ 1430 if (ALTQ_IS_ENABLED(ifq)) 1431 ALTQ_PURGE(ifq); 1432#endif 1433 n = ifq->ifq_head; 1434 while ((m = n) != 0) { 1435 n = m->m_act; 1436 m_freem(m); 1437 } 1438 ifq->ifq_head = 0; 1439 ifq->ifq_tail = 0; 1440 ifq->ifq_len = 0; 1441 IFQ_UNLOCK(ifq); 1442} 1443 1444/* 1445 * Handle interface watchdog timer routines. Called 1446 * from softclock, we decrement timers (if set) and 1447 * call the appropriate interface routine on expiration. 1448 * 1449 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1450 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1451 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1452 */ 1453static void 1454if_slowtimo(void *arg) 1455{ 1456 struct ifnet *ifp; 1457 int s = splimp(); 1458 1459 IFNET_RLOCK(); 1460 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1461 if (ifp->if_timer == 0 || --ifp->if_timer) 1462 continue; 1463 if (ifp->if_watchdog) 1464 (*ifp->if_watchdog)(ifp); 1465 } 1466 IFNET_RUNLOCK(); 1467 splx(s); 1468 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1469} 1470 1471/* 1472 * Map interface name to 1473 * interface structure pointer. 1474 */ 1475struct ifnet * 1476ifunit(const char *name) 1477{ 1478 struct ifnet *ifp; 1479 1480 IFNET_RLOCK(); 1481 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1482 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1483 break; 1484 } 1485 IFNET_RUNLOCK(); 1486 return (ifp); 1487} 1488 1489/* 1490 * Hardware specific interface ioctls. 1491 */ 1492static int 1493ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1494{ 1495 struct ifreq *ifr; 1496 struct ifstat *ifs; 1497 int error = 0; 1498 int new_flags, temp_flags; 1499 size_t namelen, onamelen; 1500 char new_name[IFNAMSIZ]; 1501 struct ifaddr *ifa; 1502 struct sockaddr_dl *sdl; 1503 1504 ifr = (struct ifreq *)data; 1505 switch (cmd) { 1506 case SIOCGIFINDEX: 1507 ifr->ifr_index = ifp->if_index; 1508 break; 1509 1510 case SIOCGIFFLAGS: 1511 temp_flags = ifp->if_flags | ifp->if_drv_flags; 1512 ifr->ifr_flags = temp_flags & 0xffff; 1513 ifr->ifr_flagshigh = temp_flags >> 16; 1514 break; 1515 1516 case SIOCGIFCAP: 1517 ifr->ifr_reqcap = ifp->if_capabilities; 1518 ifr->ifr_curcap = ifp->if_capenable; 1519 break; 1520 1521#ifdef MAC 1522 case SIOCGIFMAC: 1523 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1524 break; 1525#endif 1526 1527 case SIOCGIFMETRIC: 1528 ifr->ifr_metric = ifp->if_metric; 1529 break; 1530 1531 case SIOCGIFMTU: 1532 ifr->ifr_mtu = ifp->if_mtu; 1533 break; 1534 1535 case SIOCGIFPHYS: 1536 ifr->ifr_phys = ifp->if_physical; 1537 break; 1538 1539 case SIOCSIFFLAGS: 1540 error = priv_check(td, PRIV_NET_SETIFFLAGS); 1541 if (error) 1542 return (error); 1543 /* 1544 * Currently, no driver owned flags pass the IFF_CANTCHANGE 1545 * check, so we don't need special handling here yet. 1546 */ 1547 new_flags = (ifr->ifr_flags & 0xffff) | 1548 (ifr->ifr_flagshigh << 16); 1549 if (ifp->if_flags & IFF_SMART) { 1550 /* Smart drivers twiddle their own routes */ 1551 } else if (ifp->if_flags & IFF_UP && 1552 (new_flags & IFF_UP) == 0) { 1553 int s = splimp(); 1554 if_down(ifp); 1555 splx(s); 1556 } else if (new_flags & IFF_UP && 1557 (ifp->if_flags & IFF_UP) == 0) { 1558 int s = splimp(); 1559 if_up(ifp); 1560 splx(s); 1561 } 1562 /* See if permanently promiscuous mode bit is about to flip */ 1563 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 1564 if (new_flags & IFF_PPROMISC) 1565 ifp->if_flags |= IFF_PROMISC; 1566 else if (ifp->if_pcount == 0) 1567 ifp->if_flags &= ~IFF_PROMISC; 1568 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 1569 ifp->if_xname, 1570 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 1571 } 1572 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1573 (new_flags &~ IFF_CANTCHANGE); 1574 if (ifp->if_ioctl) { 1575 IFF_LOCKGIANT(ifp); 1576 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1577 IFF_UNLOCKGIANT(ifp); 1578 } 1579 getmicrotime(&ifp->if_lastchange); 1580 break; 1581 1582 case SIOCSIFCAP: 1583 error = priv_check(td, PRIV_NET_SETIFCAP); 1584 if (error) 1585 return (error); 1586 if (ifp->if_ioctl == NULL) 1587 return (EOPNOTSUPP); 1588 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1589 return (EINVAL); 1590 IFF_LOCKGIANT(ifp); 1591 error = (*ifp->if_ioctl)(ifp, cmd, data); 1592 IFF_UNLOCKGIANT(ifp); 1593 if (error == 0) 1594 getmicrotime(&ifp->if_lastchange); 1595 break; 1596 1597#ifdef MAC 1598 case SIOCSIFMAC: 1599 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1600 break; 1601#endif 1602 1603 case SIOCSIFNAME: 1604 error = priv_check(td, PRIV_NET_SETIFNAME); 1605 if (error) 1606 return (error); 1607 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1608 if (error != 0) 1609 return (error); 1610 if (new_name[0] == '\0') 1611 return (EINVAL); 1612 if (ifunit(new_name) != NULL) 1613 return (EEXIST); 1614 1615 /* Announce the departure of the interface. */ 1616 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1617 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1618 1619 log(LOG_INFO, "%s: changing name to '%s'\n", 1620 ifp->if_xname, new_name); 1621 1622 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1623 ifa = ifp->if_addr; 1624 IFA_LOCK(ifa); 1625 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1626 namelen = strlen(new_name); 1627 onamelen = sdl->sdl_nlen; 1628 /* 1629 * Move the address if needed. This is safe because we 1630 * allocate space for a name of length IFNAMSIZ when we 1631 * create this in if_attach(). 1632 */ 1633 if (namelen != onamelen) { 1634 bcopy(sdl->sdl_data + onamelen, 1635 sdl->sdl_data + namelen, sdl->sdl_alen); 1636 } 1637 bcopy(new_name, sdl->sdl_data, namelen); 1638 sdl->sdl_nlen = namelen; 1639 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1640 bzero(sdl->sdl_data, onamelen); 1641 while (namelen != 0) 1642 sdl->sdl_data[--namelen] = 0xff; 1643 IFA_UNLOCK(ifa); 1644 1645 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1646 /* Announce the return of the interface. */ 1647 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1648 break; 1649 1650 case SIOCSIFMETRIC: 1651 error = priv_check(td, PRIV_NET_SETIFMETRIC); 1652 if (error) 1653 return (error); 1654 ifp->if_metric = ifr->ifr_metric; 1655 getmicrotime(&ifp->if_lastchange); 1656 break; 1657 1658 case SIOCSIFPHYS: 1659 error = priv_check(td, PRIV_NET_SETIFPHYS); 1660 if (error) 1661 return (error); 1662 if (ifp->if_ioctl == NULL) 1663 return (EOPNOTSUPP); 1664 IFF_LOCKGIANT(ifp); 1665 error = (*ifp->if_ioctl)(ifp, cmd, data); 1666 IFF_UNLOCKGIANT(ifp); 1667 if (error == 0) 1668 getmicrotime(&ifp->if_lastchange); 1669 break; 1670 1671 case SIOCSIFMTU: 1672 { 1673 u_long oldmtu = ifp->if_mtu; 1674 1675 error = priv_check(td, PRIV_NET_SETIFMTU); 1676 if (error) 1677 return (error); 1678 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1679 return (EINVAL); 1680 if (ifp->if_ioctl == NULL) 1681 return (EOPNOTSUPP); 1682 IFF_LOCKGIANT(ifp); 1683 error = (*ifp->if_ioctl)(ifp, cmd, data); 1684 IFF_UNLOCKGIANT(ifp); 1685 if (error == 0) { 1686 getmicrotime(&ifp->if_lastchange); 1687 rt_ifmsg(ifp); 1688 } 1689 /* 1690 * If the link MTU changed, do network layer specific procedure. 1691 */ 1692 if (ifp->if_mtu != oldmtu) { 1693#ifdef INET6 1694 nd6_setmtu(ifp); 1695#endif 1696 } 1697 break; 1698 } 1699 1700 case SIOCADDMULTI: 1701 case SIOCDELMULTI: 1702 if (cmd == SIOCADDMULTI) 1703 error = priv_check(td, PRIV_NET_ADDMULTI); 1704 else 1705 error = priv_check(td, PRIV_NET_DELMULTI); 1706 if (error) 1707 return (error); 1708 1709 /* Don't allow group membership on non-multicast interfaces. */ 1710 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1711 return (EOPNOTSUPP); 1712 1713 /* Don't let users screw up protocols' entries. */ 1714 if (ifr->ifr_addr.sa_family != AF_LINK) 1715 return (EINVAL); 1716 1717 if (cmd == SIOCADDMULTI) { 1718 struct ifmultiaddr *ifma; 1719 1720 /* 1721 * Userland is only permitted to join groups once 1722 * via the if_addmulti() KPI, because it cannot hold 1723 * struct ifmultiaddr * between calls. It may also 1724 * lose a race while we check if the membership 1725 * already exists. 1726 */ 1727 IF_ADDR_LOCK(ifp); 1728 ifma = if_findmulti(ifp, &ifr->ifr_addr); 1729 IF_ADDR_UNLOCK(ifp); 1730 if (ifma != NULL) 1731 error = EADDRINUSE; 1732 else 1733 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1734 } else { 1735 error = if_delmulti(ifp, &ifr->ifr_addr); 1736 } 1737 if (error == 0) 1738 getmicrotime(&ifp->if_lastchange); 1739 break; 1740 1741 case SIOCSIFPHYADDR: 1742 case SIOCDIFPHYADDR: 1743#ifdef INET6 1744 case SIOCSIFPHYADDR_IN6: 1745#endif 1746 case SIOCSLIFPHYADDR: 1747 case SIOCSIFMEDIA: 1748 case SIOCSIFGENERIC: 1749 error = priv_check(td, PRIV_NET_HWIOCTL); 1750 if (error) 1751 return (error); 1752 if (ifp->if_ioctl == NULL) 1753 return (EOPNOTSUPP); 1754 IFF_LOCKGIANT(ifp); 1755 error = (*ifp->if_ioctl)(ifp, cmd, data); 1756 IFF_UNLOCKGIANT(ifp); 1757 if (error == 0) 1758 getmicrotime(&ifp->if_lastchange); 1759 break; 1760 1761 case SIOCGIFSTATUS: 1762 ifs = (struct ifstat *)data; 1763 ifs->ascii[0] = '\0'; 1764 1765 case SIOCGIFPSRCADDR: 1766 case SIOCGIFPDSTADDR: 1767 case SIOCGLIFPHYADDR: 1768 case SIOCGIFMEDIA: 1769 case SIOCGIFGENERIC: 1770 if (ifp->if_ioctl == NULL) 1771 return (EOPNOTSUPP); 1772 IFF_LOCKGIANT(ifp); 1773 error = (*ifp->if_ioctl)(ifp, cmd, data); 1774 IFF_UNLOCKGIANT(ifp); 1775 break; 1776 1777 case SIOCSIFLLADDR: 1778 error = priv_check(td, PRIV_NET_SETLLADDR); 1779 if (error) 1780 return (error); 1781 error = if_setlladdr(ifp, 1782 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1783 break; 1784 1785 case SIOCAIFGROUP: 1786 { 1787 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1788 1789 error = priv_check(td, PRIV_NET_ADDIFGROUP); 1790 if (error) 1791 return (error); 1792 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 1793 return (error); 1794 break; 1795 } 1796 1797 case SIOCGIFGROUP: 1798 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 1799 return (error); 1800 break; 1801 1802 case SIOCDIFGROUP: 1803 { 1804 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 1805 1806 error = priv_check(td, PRIV_NET_DELIFGROUP); 1807 if (error) 1808 return (error); 1809 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 1810 return (error); 1811 break; 1812 } 1813 1814 default: 1815 error = ENOIOCTL; 1816 break; 1817 } 1818 return (error); 1819} 1820 1821/* 1822 * Interface ioctls. 1823 */ 1824int 1825ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1826{ 1827 struct ifnet *ifp; 1828 struct ifreq *ifr; 1829 int error; 1830 int oif_flags; 1831 1832 switch (cmd) { 1833 case SIOCGIFCONF: 1834 case OSIOCGIFCONF: 1835#ifdef __amd64__ 1836 case SIOCGIFCONF32: 1837#endif 1838 return (ifconf(cmd, data)); 1839 } 1840 ifr = (struct ifreq *)data; 1841 1842 switch (cmd) { 1843 case SIOCIFCREATE: 1844 case SIOCIFCREATE2: 1845 error = priv_check(td, PRIV_NET_IFCREATE); 1846 if (error) 1847 return (error); 1848 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 1849 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 1850 case SIOCIFDESTROY: 1851 error = priv_check(td, PRIV_NET_IFDESTROY); 1852 if (error) 1853 return (error); 1854 return if_clone_destroy(ifr->ifr_name); 1855 1856 case SIOCIFGCLONERS: 1857 return (if_clone_list((struct if_clonereq *)data)); 1858 case SIOCGIFGMEMB: 1859 return (if_getgroupmembers((struct ifgroupreq *)data)); 1860 } 1861 1862 ifp = ifunit(ifr->ifr_name); 1863 if (ifp == 0) 1864 return (ENXIO); 1865 1866 error = ifhwioctl(cmd, ifp, data, td); 1867 if (error != ENOIOCTL) 1868 return (error); 1869 1870 oif_flags = ifp->if_flags; 1871 if (so->so_proto == 0) 1872 return (EOPNOTSUPP); 1873#ifndef COMPAT_43 1874 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1875 data, 1876 ifp, td)); 1877#else 1878 { 1879 int ocmd = cmd; 1880 1881 switch (cmd) { 1882 1883 case SIOCSIFDSTADDR: 1884 case SIOCSIFADDR: 1885 case SIOCSIFBRDADDR: 1886 case SIOCSIFNETMASK: 1887#if BYTE_ORDER != BIG_ENDIAN 1888 if (ifr->ifr_addr.sa_family == 0 && 1889 ifr->ifr_addr.sa_len < 16) { 1890 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1891 ifr->ifr_addr.sa_len = 16; 1892 } 1893#else 1894 if (ifr->ifr_addr.sa_len == 0) 1895 ifr->ifr_addr.sa_len = 16; 1896#endif 1897 break; 1898 1899 case OSIOCGIFADDR: 1900 cmd = SIOCGIFADDR; 1901 break; 1902 1903 case OSIOCGIFDSTADDR: 1904 cmd = SIOCGIFDSTADDR; 1905 break; 1906 1907 case OSIOCGIFBRDADDR: 1908 cmd = SIOCGIFBRDADDR; 1909 break; 1910 1911 case OSIOCGIFNETMASK: 1912 cmd = SIOCGIFNETMASK; 1913 } 1914 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1915 cmd, 1916 data, 1917 ifp, td)); 1918 switch (ocmd) { 1919 1920 case OSIOCGIFADDR: 1921 case OSIOCGIFDSTADDR: 1922 case OSIOCGIFBRDADDR: 1923 case OSIOCGIFNETMASK: 1924 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1925 1926 } 1927 } 1928#endif /* COMPAT_43 */ 1929 1930 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1931#ifdef INET6 1932 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1933 if (ifp->if_flags & IFF_UP) { 1934 int s = splimp(); 1935 in6_if_up(ifp); 1936 splx(s); 1937 } 1938#endif 1939 } 1940 return (error); 1941} 1942 1943/* 1944 * The code common to handling reference counted flags, 1945 * e.g., in ifpromisc() and if_allmulti(). 1946 * The "pflag" argument can specify a permanent mode flag to check, 1947 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 1948 * 1949 * Only to be used on stack-owned flags, not driver-owned flags. 1950 */ 1951static int 1952if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 1953{ 1954 struct ifreq ifr; 1955 int error; 1956 int oldflags, oldcount; 1957 1958 /* Sanity checks to catch programming errors */ 1959 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 1960 ("%s: setting driver-owned flag %d", __func__, flag)); 1961 1962 if (onswitch) 1963 KASSERT(*refcount >= 0, 1964 ("%s: increment negative refcount %d for flag %d", 1965 __func__, *refcount, flag)); 1966 else 1967 KASSERT(*refcount > 0, 1968 ("%s: decrement non-positive refcount %d for flag %d", 1969 __func__, *refcount, flag)); 1970 1971 /* In case this mode is permanent, just touch refcount */ 1972 if (ifp->if_flags & pflag) { 1973 *refcount += onswitch ? 1 : -1; 1974 return (0); 1975 } 1976 1977 /* Save ifnet parameters for if_ioctl() may fail */ 1978 oldcount = *refcount; 1979 oldflags = ifp->if_flags; 1980 1981 /* 1982 * See if we aren't the only and touching refcount is enough. 1983 * Actually toggle interface flag if we are the first or last. 1984 */ 1985 if (onswitch) { 1986 if ((*refcount)++) 1987 return (0); 1988 ifp->if_flags |= flag; 1989 } else { 1990 if (--(*refcount)) 1991 return (0); 1992 ifp->if_flags &= ~flag; 1993 } 1994 1995 /* Call down the driver since we've changed interface flags */ 1996 if (ifp->if_ioctl == NULL) { 1997 error = EOPNOTSUPP; 1998 goto recover; 1999 } 2000 ifr.ifr_flags = ifp->if_flags & 0xffff; 2001 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2002 IFF_LOCKGIANT(ifp); 2003 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2004 IFF_UNLOCKGIANT(ifp); 2005 if (error) 2006 goto recover; 2007 /* Notify userland that interface flags have changed */ 2008 rt_ifmsg(ifp); 2009 return (0); 2010 2011recover: 2012 /* Recover after driver error */ 2013 *refcount = oldcount; 2014 ifp->if_flags = oldflags; 2015 return (error); 2016} 2017 2018/* 2019 * Set/clear promiscuous mode on interface ifp based on the truth value 2020 * of pswitch. The calls are reference counted so that only the first 2021 * "on" request actually has an effect, as does the final "off" request. 2022 * Results are undefined if the "off" and "on" requests are not matched. 2023 */ 2024int 2025ifpromisc(struct ifnet *ifp, int pswitch) 2026{ 2027 int error; 2028 int oldflags = ifp->if_flags; 2029 2030 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2031 &ifp->if_pcount, pswitch); 2032 /* If promiscuous mode status has changed, log a message */ 2033 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2034 log(LOG_INFO, "%s: promiscuous mode %s\n", 2035 ifp->if_xname, 2036 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2037 return (error); 2038} 2039 2040/* 2041 * Return interface configuration 2042 * of system. List may be used 2043 * in later ioctl's (above) to get 2044 * other information. 2045 */ 2046/*ARGSUSED*/ 2047static int 2048ifconf(u_long cmd, caddr_t data) 2049{ 2050 struct ifconf *ifc = (struct ifconf *)data; 2051#ifdef __amd64__ 2052 struct ifconf32 *ifc32 = (struct ifconf32 *)data; 2053 struct ifconf ifc_swab; 2054#endif 2055 struct ifnet *ifp; 2056 struct ifaddr *ifa; 2057 struct ifreq ifr; 2058 struct sbuf *sb; 2059 int error, full = 0, valid_len, max_len; 2060 2061#ifdef __amd64__ 2062 if (cmd == SIOCGIFCONF32) { 2063 ifc_swab.ifc_len = ifc32->ifc_len; 2064 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; 2065 ifc = &ifc_swab; 2066 } 2067#endif 2068 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2069 max_len = MAXPHYS - 1; 2070 2071 /* Prevent hostile input from being able to crash the system */ 2072 if (ifc->ifc_len <= 0) 2073 return (EINVAL); 2074 2075again: 2076 if (ifc->ifc_len <= max_len) { 2077 max_len = ifc->ifc_len; 2078 full = 1; 2079 } 2080 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2081 max_len = 0; 2082 valid_len = 0; 2083 2084 IFNET_RLOCK(); /* could sleep XXX */ 2085 TAILQ_FOREACH(ifp, &ifnet, if_link) { 2086 int addrs; 2087 2088 /* 2089 * Zero the ifr_name buffer to make sure we don't 2090 * disclose the contents of the stack. 2091 */ 2092 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2093 2094 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2095 >= sizeof(ifr.ifr_name)) { 2096 sbuf_delete(sb); 2097 IFNET_RUNLOCK(); 2098 return (ENAMETOOLONG); 2099 } 2100 2101 addrs = 0; 2102 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2103 struct sockaddr *sa = ifa->ifa_addr; 2104 2105 if (jailed(curthread->td_ucred) && 2106 prison_if(curthread->td_ucred, sa)) 2107 continue; 2108 addrs++; 2109#ifdef COMPAT_43 2110 if (cmd == OSIOCGIFCONF) { 2111 struct osockaddr *osa = 2112 (struct osockaddr *)&ifr.ifr_addr; 2113 ifr.ifr_addr = *sa; 2114 osa->sa_family = sa->sa_family; 2115 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2116 max_len += sizeof(ifr); 2117 } else 2118#endif 2119 if (sa->sa_len <= sizeof(*sa)) { 2120 ifr.ifr_addr = *sa; 2121 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2122 max_len += sizeof(ifr); 2123 } else { 2124 sbuf_bcat(sb, &ifr, 2125 offsetof(struct ifreq, ifr_addr)); 2126 max_len += offsetof(struct ifreq, ifr_addr); 2127 sbuf_bcat(sb, sa, sa->sa_len); 2128 max_len += sa->sa_len; 2129 } 2130 2131 if (!sbuf_overflowed(sb)) 2132 valid_len = sbuf_len(sb); 2133 } 2134 if (addrs == 0) { 2135 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2136 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2137 max_len += sizeof(ifr); 2138 2139 if (!sbuf_overflowed(sb)) 2140 valid_len = sbuf_len(sb); 2141 } 2142 } 2143 IFNET_RUNLOCK(); 2144 2145 /* 2146 * If we didn't allocate enough space (uncommon), try again. If 2147 * we have already allocated as much space as we are allowed, 2148 * return what we've got. 2149 */ 2150 if (valid_len != max_len && !full) { 2151 sbuf_delete(sb); 2152 goto again; 2153 } 2154 2155 ifc->ifc_len = valid_len; 2156#ifdef __amd64__ 2157 if (cmd == SIOCGIFCONF32) 2158 ifc32->ifc_len = valid_len; 2159#endif 2160 sbuf_finish(sb); 2161 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2162 sbuf_delete(sb); 2163 return (error); 2164} 2165 2166/* 2167 * Just like ifpromisc(), but for all-multicast-reception mode. 2168 */ 2169int 2170if_allmulti(struct ifnet *ifp, int onswitch) 2171{ 2172 2173 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2174} 2175 2176struct ifmultiaddr * 2177if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2178{ 2179 struct ifmultiaddr *ifma; 2180 2181 IF_ADDR_LOCK_ASSERT(ifp); 2182 2183 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2184 if (sa->sa_family == AF_LINK) { 2185 if (sa_dl_equal(ifma->ifma_addr, sa)) 2186 break; 2187 } else { 2188 if (sa_equal(ifma->ifma_addr, sa)) 2189 break; 2190 } 2191 } 2192 2193 return ifma; 2194} 2195 2196/* 2197 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2198 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2199 * the ifnet multicast address list here, so the caller must do that and 2200 * other setup work (such as notifying the device driver). The reference 2201 * count is initialized to 1. 2202 */ 2203static struct ifmultiaddr * 2204if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2205 int mflags) 2206{ 2207 struct ifmultiaddr *ifma; 2208 struct sockaddr *dupsa; 2209 2210 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags | 2211 M_ZERO); 2212 if (ifma == NULL) 2213 return (NULL); 2214 2215 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags); 2216 if (dupsa == NULL) { 2217 FREE(ifma, M_IFMADDR); 2218 return (NULL); 2219 } 2220 bcopy(sa, dupsa, sa->sa_len); 2221 ifma->ifma_addr = dupsa; 2222 2223 ifma->ifma_ifp = ifp; 2224 ifma->ifma_refcount = 1; 2225 ifma->ifma_protospec = NULL; 2226 2227 if (llsa == NULL) { 2228 ifma->ifma_lladdr = NULL; 2229 return (ifma); 2230 } 2231 2232 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags); 2233 if (dupsa == NULL) { 2234 FREE(ifma->ifma_addr, M_IFMADDR); 2235 FREE(ifma, M_IFMADDR); 2236 return (NULL); 2237 } 2238 bcopy(llsa, dupsa, llsa->sa_len); 2239 ifma->ifma_lladdr = dupsa; 2240 2241 return (ifma); 2242} 2243 2244/* 2245 * if_freemulti: free ifmultiaddr structure and possibly attached related 2246 * addresses. The caller is responsible for implementing reference 2247 * counting, notifying the driver, handling routing messages, and releasing 2248 * any dependent link layer state. 2249 */ 2250static void 2251if_freemulti(struct ifmultiaddr *ifma) 2252{ 2253 2254 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2255 ifma->ifma_refcount)); 2256 KASSERT(ifma->ifma_protospec == NULL, 2257 ("if_freemulti: protospec not NULL")); 2258 2259 if (ifma->ifma_lladdr != NULL) 2260 FREE(ifma->ifma_lladdr, M_IFMADDR); 2261 FREE(ifma->ifma_addr, M_IFMADDR); 2262 FREE(ifma, M_IFMADDR); 2263} 2264 2265/* 2266 * Register an additional multicast address with a network interface. 2267 * 2268 * - If the address is already present, bump the reference count on the 2269 * address and return. 2270 * - If the address is not link-layer, look up a link layer address. 2271 * - Allocate address structures for one or both addresses, and attach to the 2272 * multicast address list on the interface. If automatically adding a link 2273 * layer address, the protocol address will own a reference to the link 2274 * layer address, to be freed when it is freed. 2275 * - Notify the network device driver of an addition to the multicast address 2276 * list. 2277 * 2278 * 'sa' points to caller-owned memory with the desired multicast address. 2279 * 2280 * 'retifma' will be used to return a pointer to the resulting multicast 2281 * address reference, if desired. 2282 */ 2283int 2284if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2285 struct ifmultiaddr **retifma) 2286{ 2287 struct ifmultiaddr *ifma, *ll_ifma; 2288 struct sockaddr *llsa; 2289 int error; 2290 2291 /* 2292 * If the address is already present, return a new reference to it; 2293 * otherwise, allocate storage and set up a new address. 2294 */ 2295 IF_ADDR_LOCK(ifp); 2296 ifma = if_findmulti(ifp, sa); 2297 if (ifma != NULL) { 2298 ifma->ifma_refcount++; 2299 if (retifma != NULL) 2300 *retifma = ifma; 2301 IF_ADDR_UNLOCK(ifp); 2302 return (0); 2303 } 2304 2305 /* 2306 * The address isn't already present; resolve the protocol address 2307 * into a link layer address, and then look that up, bump its 2308 * refcount or allocate an ifma for that also. If 'llsa' was 2309 * returned, we will need to free it later. 2310 */ 2311 llsa = NULL; 2312 ll_ifma = NULL; 2313 if (ifp->if_resolvemulti != NULL) { 2314 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2315 if (error) 2316 goto unlock_out; 2317 } 2318 2319 /* 2320 * Allocate the new address. Don't hook it up yet, as we may also 2321 * need to allocate a link layer multicast address. 2322 */ 2323 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2324 if (ifma == NULL) { 2325 error = ENOMEM; 2326 goto free_llsa_out; 2327 } 2328 2329 /* 2330 * If a link layer address is found, we'll need to see if it's 2331 * already present in the address list, or allocate is as well. 2332 * When this block finishes, the link layer address will be on the 2333 * list. 2334 */ 2335 if (llsa != NULL) { 2336 ll_ifma = if_findmulti(ifp, llsa); 2337 if (ll_ifma == NULL) { 2338 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2339 if (ll_ifma == NULL) { 2340 --ifma->ifma_refcount; 2341 if_freemulti(ifma); 2342 error = ENOMEM; 2343 goto free_llsa_out; 2344 } 2345 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2346 ifma_link); 2347 } else 2348 ll_ifma->ifma_refcount++; 2349 ifma->ifma_llifma = ll_ifma; 2350 } 2351 2352 /* 2353 * We now have a new multicast address, ifma, and possibly a new or 2354 * referenced link layer address. Add the primary address to the 2355 * ifnet address list. 2356 */ 2357 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2358 2359 if (retifma != NULL) 2360 *retifma = ifma; 2361 2362 /* 2363 * Must generate the message while holding the lock so that 'ifma' 2364 * pointer is still valid. 2365 */ 2366 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2367 IF_ADDR_UNLOCK(ifp); 2368 2369 /* 2370 * We are certain we have added something, so call down to the 2371 * interface to let them know about it. 2372 */ 2373 if (ifp->if_ioctl != NULL) { 2374 IFF_LOCKGIANT(ifp); 2375 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2376 IFF_UNLOCKGIANT(ifp); 2377 } 2378 2379 if (llsa != NULL) 2380 FREE(llsa, M_IFMADDR); 2381 2382 return (0); 2383 2384free_llsa_out: 2385 if (llsa != NULL) 2386 FREE(llsa, M_IFMADDR); 2387 2388unlock_out: 2389 IF_ADDR_UNLOCK(ifp); 2390 return (error); 2391} 2392 2393/* 2394 * Delete a multicast group membership by network-layer group address. 2395 * 2396 * Returns ENOENT if the entry could not be found. If ifp no longer 2397 * exists, results are undefined. This entry point should only be used 2398 * from subsystems which do appropriate locking to hold ifp for the 2399 * duration of the call. 2400 * Network-layer protocol domains must use if_delmulti_ifma(). 2401 */ 2402int 2403if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2404{ 2405 struct ifmultiaddr *ifma; 2406 int lastref; 2407#ifdef INVARIANTS 2408 struct ifnet *oifp; 2409 2410 IFNET_RLOCK(); 2411 TAILQ_FOREACH(oifp, &ifnet, if_link) 2412 if (ifp == oifp) 2413 break; 2414 if (ifp != oifp) 2415 ifp = NULL; 2416 IFNET_RUNLOCK(); 2417 2418 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 2419#endif 2420 if (ifp == NULL) 2421 return (ENOENT); 2422 2423 IF_ADDR_LOCK(ifp); 2424 lastref = 0; 2425 ifma = if_findmulti(ifp, sa); 2426 if (ifma != NULL) 2427 lastref = if_delmulti_locked(ifp, ifma, 0); 2428 IF_ADDR_UNLOCK(ifp); 2429 2430 if (ifma == NULL) 2431 return (ENOENT); 2432 2433 if (lastref && ifp->if_ioctl != NULL) { 2434 IFF_LOCKGIANT(ifp); 2435 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2436 IFF_UNLOCKGIANT(ifp); 2437 } 2438 2439 return (0); 2440} 2441 2442/* 2443 * Delete a multicast group membership by group membership pointer. 2444 * Network-layer protocol domains must use this routine. 2445 * 2446 * It is safe to call this routine if the ifp disappeared. Callers should 2447 * hold IFF_LOCKGIANT() to avoid a LOR in case the hardware needs to be 2448 * reconfigured. 2449 */ 2450void 2451if_delmulti_ifma(struct ifmultiaddr *ifma) 2452{ 2453 struct ifnet *ifp; 2454 int lastref; 2455 2456 ifp = ifma->ifma_ifp; 2457#ifdef DIAGNOSTIC 2458 if (ifp == NULL) { 2459 printf("%s: ifma_ifp seems to be detached\n", __func__); 2460 } else { 2461 struct ifnet *oifp; 2462 2463 IFNET_RLOCK(); 2464 TAILQ_FOREACH(oifp, &ifnet, if_link) 2465 if (ifp == oifp) 2466 break; 2467 if (ifp != oifp) { 2468 printf("%s: ifnet %p disappeared\n", __func__, ifp); 2469 ifp = NULL; 2470 } 2471 IFNET_RUNLOCK(); 2472 } 2473#endif 2474 /* 2475 * If and only if the ifnet instance exists: Acquire the address lock. 2476 */ 2477 if (ifp != NULL) 2478 IF_ADDR_LOCK(ifp); 2479 2480 lastref = if_delmulti_locked(ifp, ifma, 0); 2481 2482 if (ifp != NULL) { 2483 /* 2484 * If and only if the ifnet instance exists: 2485 * Release the address lock. 2486 * If the group was left: update the hardware hash filter. 2487 */ 2488 IF_ADDR_UNLOCK(ifp); 2489 if (lastref && ifp->if_ioctl != NULL) { 2490 IFF_LOCKGIANT(ifp); 2491 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 2492 IFF_UNLOCKGIANT(ifp); 2493 } 2494 } 2495} 2496 2497/* 2498 * Perform deletion of network-layer and/or link-layer multicast address. 2499 * 2500 * Return 0 if the reference count was decremented. 2501 * Return 1 if the final reference was released, indicating that the 2502 * hardware hash filter should be reprogrammed. 2503 */ 2504static int 2505if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 2506{ 2507 struct ifmultiaddr *ll_ifma; 2508 2509 if (ifp != NULL && ifma->ifma_ifp != NULL) { 2510 KASSERT(ifma->ifma_ifp == ifp, 2511 ("%s: inconsistent ifp %p", __func__, ifp)); 2512 IF_ADDR_LOCK_ASSERT(ifp); 2513 } 2514 2515 ifp = ifma->ifma_ifp; 2516 2517 /* 2518 * If the ifnet is detaching, null out references to ifnet, 2519 * so that upper protocol layers will notice, and not attempt 2520 * to obtain locks for an ifnet which no longer exists. The 2521 * routing socket announcement must happen before the ifnet 2522 * instance is detached from the system. 2523 */ 2524 if (detaching) { 2525#ifdef DIAGNOSTIC 2526 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 2527#endif 2528 /* 2529 * ifp may already be nulled out if we are being reentered 2530 * to delete the ll_ifma. 2531 */ 2532 if (ifp != NULL) { 2533 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2534 ifma->ifma_ifp = NULL; 2535 } 2536 } 2537 2538 if (--ifma->ifma_refcount > 0) 2539 return 0; 2540 2541 /* 2542 * If this ifma is a network-layer ifma, a link-layer ifma may 2543 * have been associated with it. Release it first if so. 2544 */ 2545 ll_ifma = ifma->ifma_llifma; 2546 if (ll_ifma != NULL) { 2547 KASSERT(ifma->ifma_lladdr != NULL, 2548 ("%s: llifma w/o lladdr", __func__)); 2549 if (detaching) 2550 ll_ifma->ifma_ifp = NULL; /* XXX */ 2551 if (--ll_ifma->ifma_refcount == 0) { 2552 if (ifp != NULL) { 2553 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 2554 ifma_link); 2555 } 2556 if_freemulti(ll_ifma); 2557 } 2558 } 2559 2560 if (ifp != NULL) 2561 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2562 2563 if_freemulti(ifma); 2564 2565 /* 2566 * The last reference to this instance of struct ifmultiaddr 2567 * was released; the hardware should be notified of this change. 2568 */ 2569 return 1; 2570} 2571 2572/* 2573 * Set the link layer address on an interface. 2574 * 2575 * At this time we only support certain types of interfaces, 2576 * and we don't allow the length of the address to change. 2577 */ 2578int 2579if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2580{ 2581 struct sockaddr_dl *sdl; 2582 struct ifaddr *ifa; 2583 struct ifreq ifr; 2584 2585 ifa = ifp->if_addr; 2586 if (ifa == NULL) 2587 return (EINVAL); 2588 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2589 if (sdl == NULL) 2590 return (EINVAL); 2591 if (len != sdl->sdl_alen) /* don't allow length to change */ 2592 return (EINVAL); 2593 switch (ifp->if_type) { 2594 case IFT_ETHER: 2595 case IFT_FDDI: 2596 case IFT_XETHER: 2597 case IFT_ISO88025: 2598 case IFT_L2VLAN: 2599 case IFT_BRIDGE: 2600 case IFT_ARCNET: 2601 case IFT_IEEE8023ADLAG: 2602 bcopy(lladdr, LLADDR(sdl), len); 2603 break; 2604 default: 2605 return (ENODEV); 2606 } 2607 /* 2608 * If the interface is already up, we need 2609 * to re-init it in order to reprogram its 2610 * address filter. 2611 */ 2612 if ((ifp->if_flags & IFF_UP) != 0) { 2613 if (ifp->if_ioctl) { 2614 IFF_LOCKGIANT(ifp); 2615 ifp->if_flags &= ~IFF_UP; 2616 ifr.ifr_flags = ifp->if_flags & 0xffff; 2617 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2618 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2619 ifp->if_flags |= IFF_UP; 2620 ifr.ifr_flags = ifp->if_flags & 0xffff; 2621 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2622 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2623 IFF_UNLOCKGIANT(ifp); 2624 } 2625#ifdef INET 2626 /* 2627 * Also send gratuitous ARPs to notify other nodes about 2628 * the address change. 2629 */ 2630 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2631 if (ifa->ifa_addr->sa_family == AF_INET) 2632 arp_ifinit(ifp, ifa); 2633 } 2634#endif 2635 } 2636 return (0); 2637} 2638 2639/* 2640 * The name argument must be a pointer to storage which will last as 2641 * long as the interface does. For physical devices, the result of 2642 * device_get_name(dev) is a good choice and for pseudo-devices a 2643 * static string works well. 2644 */ 2645void 2646if_initname(struct ifnet *ifp, const char *name, int unit) 2647{ 2648 ifp->if_dname = name; 2649 ifp->if_dunit = unit; 2650 if (unit != IF_DUNIT_NONE) 2651 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2652 else 2653 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2654} 2655 2656int 2657if_printf(struct ifnet *ifp, const char * fmt, ...) 2658{ 2659 va_list ap; 2660 int retval; 2661 2662 retval = printf("%s: ", ifp->if_xname); 2663 va_start(ap, fmt); 2664 retval += vprintf(fmt, ap); 2665 va_end(ap); 2666 return (retval); 2667} 2668 2669/* 2670 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 2671 * be called without Giant. However, we often can't acquire the Giant lock 2672 * at those points; instead, we run it via a task queue that holds Giant via 2673 * if_start_deferred. 2674 * 2675 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 2676 * outstanding if_start_deferred() tasks that will run after the free. This 2677 * probably means waiting in if_detach(). 2678 */ 2679void 2680if_start(struct ifnet *ifp) 2681{ 2682 2683 NET_ASSERT_GIANT(); 2684 2685 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 2686 if (mtx_owned(&Giant)) 2687 (*(ifp)->if_start)(ifp); 2688 else 2689 taskqueue_enqueue(taskqueue_swi_giant, 2690 &ifp->if_starttask); 2691 } else 2692 (*(ifp)->if_start)(ifp); 2693} 2694 2695static void 2696if_start_deferred(void *context, int pending) 2697{ 2698 struct ifnet *ifp; 2699 2700 /* 2701 * This code must be entered with Giant, and should never run if 2702 * we're not running with debug.mpsafenet. 2703 */ 2704 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 2705 GIANT_REQUIRED; 2706 2707 ifp = context; 2708 (ifp->if_start)(ifp); 2709} 2710 2711int 2712if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2713{ 2714 int active = 0; 2715 2716 IF_LOCK(ifq); 2717 if (_IF_QFULL(ifq)) { 2718 _IF_DROP(ifq); 2719 IF_UNLOCK(ifq); 2720 m_freem(m); 2721 return (0); 2722 } 2723 if (ifp != NULL) { 2724 ifp->if_obytes += m->m_pkthdr.len + adjust; 2725 if (m->m_flags & (M_BCAST|M_MCAST)) 2726 ifp->if_omcasts++; 2727 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 2728 } 2729 _IF_ENQUEUE(ifq, m); 2730 IF_UNLOCK(ifq); 2731 if (ifp != NULL && !active) 2732 if_start(ifp); 2733 return (1); 2734} 2735 2736void 2737if_register_com_alloc(u_char type, 2738 if_com_alloc_t *a, if_com_free_t *f) 2739{ 2740 2741 KASSERT(if_com_alloc[type] == NULL, 2742 ("if_register_com_alloc: %d already registered", type)); 2743 KASSERT(if_com_free[type] == NULL, 2744 ("if_register_com_alloc: %d free already registered", type)); 2745 2746 if_com_alloc[type] = a; 2747 if_com_free[type] = f; 2748} 2749 2750void 2751if_deregister_com_alloc(u_char type) 2752{ 2753 2754 KASSERT(if_com_alloc[type] != NULL, 2755 ("if_deregister_com_alloc: %d not registered", type)); 2756 KASSERT(if_com_free[type] != NULL, 2757 ("if_deregister_com_alloc: %d free not registered", type)); 2758 if_com_alloc[type] = NULL; 2759 if_com_free[type] = NULL; 2760} 2761