if.c revision 136704
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 136704 2004-10-19 18:11:55Z rwatson $ 31 */ 32 33#include "opt_compat.h" 34#include "opt_inet6.h" 35#include "opt_inet.h" 36#include "opt_mac.h" 37 38#include <sys/param.h> 39#include <sys/types.h> 40#include <sys/conf.h> 41#include <sys/mac.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/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/sockio.h> 53#include <sys/syslog.h> 54#include <sys/sysctl.h> 55#include <sys/taskqueue.h> 56#include <sys/domain.h> 57#include <sys/jail.h> 58#include <machine/stdarg.h> 59 60#include <net/if.h> 61#include <net/if_arp.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 82struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 83 84static void if_attachdomain(void *); 85static void if_attachdomain1(struct ifnet *); 86static int ifconf(u_long, caddr_t); 87static void if_grow(void); 88static void if_init(void *); 89static void if_check(void *); 90static int if_findindex(struct ifnet *); 91static void if_qflush(struct ifaltq *); 92static void if_route(struct ifnet *, int flag, int fam); 93static void if_slowtimo(void *); 94static void if_unroute(struct ifnet *, int flag, int fam); 95static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 96static int if_rtdel(struct radix_node *, void *); 97static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 98static void if_start_deferred(void *context, int pending); 99#ifdef INET6 100/* 101 * XXX: declare here to avoid to include many inet6 related files.. 102 * should be more generalized? 103 */ 104extern void nd6_setmtu(struct ifnet *); 105#endif 106 107int if_index = 0; 108struct ifindex_entry *ifindex_table = NULL; 109int ifqmaxlen = IFQ_MAXLEN; 110struct ifnethead ifnet; /* depend on static init XXX */ 111struct mtx ifnet_lock; 112 113static int if_indexlim = 8; 114static struct knlist ifklist; 115 116static void filt_netdetach(struct knote *kn); 117static int filt_netdev(struct knote *kn, long hint); 118 119static struct filterops netdev_filtops = 120 { 1, NULL, filt_netdetach, filt_netdev }; 121 122/* 123 * System initialization 124 */ 125SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 126SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 127 128MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 129MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 130 131static d_open_t netopen; 132static d_close_t netclose; 133static d_ioctl_t netioctl; 134static d_kqfilter_t netkqfilter; 135 136static struct cdevsw net_cdevsw = { 137 .d_version = D_VERSION, 138 .d_flags = D_NEEDGIANT, 139 .d_open = netopen, 140 .d_close = netclose, 141 .d_ioctl = netioctl, 142 .d_name = "net", 143 .d_kqfilter = netkqfilter, 144}; 145 146static int 147netopen(struct cdev *dev, int flag, int mode, struct thread *td) 148{ 149 return (0); 150} 151 152static int 153netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 154{ 155 return (0); 156} 157 158static int 159netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 160{ 161 struct ifnet *ifp; 162 int error, idx; 163 164 /* only support interface specific ioctls */ 165 if (IOCGROUP(cmd) != 'i') 166 return (EOPNOTSUPP); 167 idx = minor(dev); 168 if (idx == 0) { 169 /* 170 * special network device, not interface. 171 */ 172 if (cmd == SIOCGIFCONF) 173 return (ifconf(cmd, data)); /* XXX remove cmd */ 174 return (EOPNOTSUPP); 175 } 176 177 ifp = ifnet_byindex(idx); 178 if (ifp == NULL) 179 return (ENXIO); 180 181 error = ifhwioctl(cmd, ifp, data, td); 182 if (error == ENOIOCTL) 183 error = EOPNOTSUPP; 184 return (error); 185} 186 187static int 188netkqfilter(struct cdev *dev, struct knote *kn) 189{ 190 struct knlist *klist; 191 struct ifnet *ifp; 192 int idx; 193 194 switch (kn->kn_filter) { 195 case EVFILT_NETDEV: 196 kn->kn_fop = &netdev_filtops; 197 break; 198 default: 199 return (1); 200 } 201 202 idx = minor(dev); 203 if (idx == 0) { 204 klist = &ifklist; 205 } else { 206 ifp = ifnet_byindex(idx); 207 if (ifp == NULL) 208 return (1); 209 klist = &ifp->if_klist; 210 } 211 212 kn->kn_hook = (caddr_t)klist; 213 214 knlist_add(klist, kn, 0); 215 216 return (0); 217} 218 219static void 220filt_netdetach(struct knote *kn) 221{ 222 struct knlist *klist = (struct knlist *)kn->kn_hook; 223 224 knlist_remove(klist, kn, 0); 225} 226 227static int 228filt_netdev(struct knote *kn, long hint) 229{ 230 struct knlist *klist = (struct knlist *)kn->kn_hook; 231 232 /* 233 * Currently NOTE_EXIT is abused to indicate device detach. 234 */ 235 if (hint == NOTE_EXIT) { 236 kn->kn_data = NOTE_LINKINV; 237 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 238 knlist_remove_inevent(klist, kn); 239 return (1); 240 } 241 if (hint != 0) 242 kn->kn_data = hint; /* current status */ 243 if (kn->kn_sfflags & hint) 244 kn->kn_fflags |= hint; 245 return (kn->kn_fflags != 0); 246} 247 248/* 249 * Network interface utility routines. 250 * 251 * Routines with ifa_ifwith* names take sockaddr *'s as 252 * parameters. 253 */ 254/* ARGSUSED*/ 255static void 256if_init(void *dummy __unused) 257{ 258 259 IFNET_LOCK_INIT(); 260 TAILQ_INIT(&ifnet); 261 knlist_init(&ifklist, NULL); 262 if_grow(); /* create initial table */ 263 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 264 UID_ROOT, GID_WHEEL, 0600, "network"); 265 if_clone_init(); 266} 267 268static void 269if_grow(void) 270{ 271 u_int n; 272 struct ifindex_entry *e; 273 274 if_indexlim <<= 1; 275 n = if_indexlim * sizeof(*e); 276 e = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 277 if (ifindex_table != NULL) { 278 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 279 free((caddr_t)ifindex_table, M_IFADDR); 280 } 281 ifindex_table = e; 282} 283 284/* ARGSUSED*/ 285static void 286if_check(void *dummy __unused) 287{ 288 struct ifnet *ifp; 289 int s; 290 291 s = splimp(); 292 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 293 TAILQ_FOREACH(ifp, &ifnet, if_link) { 294 if (ifp->if_snd.ifq_maxlen == 0) { 295 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 296 ifp->if_snd.ifq_maxlen = ifqmaxlen; 297 } 298 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 299 if_printf(ifp, 300 "XXX: driver didn't initialize queue mtx\n"); 301 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 302 MTX_NETWORK_LOCK, MTX_DEF); 303 } 304 } 305 IFNET_RUNLOCK(); 306 splx(s); 307 if_slowtimo(0); 308} 309 310static int 311if_findindex(struct ifnet *ifp) 312{ 313 int i, unit; 314 char eaddr[18], devname[32]; 315 const char *name, *p; 316 317 switch (ifp->if_type) { 318 case IFT_ETHER: /* these types use struct arpcom */ 319 case IFT_FDDI: 320 case IFT_XETHER: 321 case IFT_ISO88025: 322 case IFT_L2VLAN: 323 snprintf(eaddr, 18, "%6D", IFP2AC(ifp)->ac_enaddr, ":"); 324 break; 325 default: 326 eaddr[0] = '\0'; 327 break; 328 } 329 strlcpy(devname, ifp->if_xname, sizeof(devname)); 330 name = net_cdevsw.d_name; 331 i = 0; 332 while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) { 333 if (resource_string_value(name, unit, "ether", &p) == 0) 334 if (strcmp(p, eaddr) == 0) 335 goto found; 336 if (resource_string_value(name, unit, "dev", &p) == 0) 337 if (strcmp(p, devname) == 0) 338 goto found; 339 } 340 unit = 0; 341found: 342 if (unit != 0) { 343 if (ifaddr_byindex(unit) == NULL) 344 return (unit); 345 printf("%s%d in use, cannot hardwire it to %s.\n", 346 name, unit, devname); 347 } 348 for (unit = 1; ; unit++) { 349 if (unit <= if_index && ifaddr_byindex(unit) != NULL) 350 continue; 351 if (resource_string_value(name, unit, "ether", &p) == 0 || 352 resource_string_value(name, unit, "dev", &p) == 0) 353 continue; 354 break; 355 } 356 return (unit); 357} 358 359/* 360 * Attach an interface to the 361 * list of "active" interfaces. 362 */ 363void 364if_attach(struct ifnet *ifp) 365{ 366 unsigned socksize, ifasize; 367 int namelen, masklen; 368 struct sockaddr_dl *sdl; 369 struct ifaddr *ifa; 370 371 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 372 IF_AFDATA_LOCK_INIT(ifp); 373 ifp->if_afdata_initialized = 0; 374 IFNET_WLOCK(); 375 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 376 IFNET_WUNLOCK(); 377 /* 378 * XXX - 379 * The old code would work if the interface passed a pre-existing 380 * chain of ifaddrs to this code. We don't trust our callers to 381 * properly initialize the tailq, however, so we no longer allow 382 * this unlikely case. 383 */ 384 TAILQ_INIT(&ifp->if_addrhead); 385 TAILQ_INIT(&ifp->if_prefixhead); 386 TAILQ_INIT(&ifp->if_multiaddrs); 387 knlist_init(&ifp->if_klist, NULL); 388 getmicrotime(&ifp->if_lastchange); 389 ifp->if_data.ifi_epoch = time_second; 390 391#ifdef MAC 392 mac_init_ifnet(ifp); 393 mac_create_ifnet(ifp); 394#endif 395 396 ifp->if_index = if_findindex(ifp); 397 if (ifp->if_index > if_index) 398 if_index = ifp->if_index; 399 if (if_index >= if_indexlim) 400 if_grow(); 401 ifp->if_data.ifi_datalen = sizeof(struct if_data); 402 403 ifnet_byindex(ifp->if_index) = ifp; 404 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 405 unit2minor(ifp->if_index), 406 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 407 net_cdevsw.d_name, ifp->if_xname); 408 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 409 net_cdevsw.d_name, ifp->if_index); 410 411 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 412 413 /* 414 * create a Link Level name for this device 415 */ 416 namelen = strlen(ifp->if_xname); 417 /* 418 * Always save enough space for any possiable name so we can do 419 * a rename in place later. 420 */ 421 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 422 socksize = masklen + ifp->if_addrlen; 423 if (socksize < sizeof(*sdl)) 424 socksize = sizeof(*sdl); 425 socksize = roundup2(socksize, sizeof(long)); 426 ifasize = sizeof(*ifa) + 2 * socksize; 427 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 428 IFA_LOCK_INIT(ifa); 429 sdl = (struct sockaddr_dl *)(ifa + 1); 430 sdl->sdl_len = socksize; 431 sdl->sdl_family = AF_LINK; 432 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 433 sdl->sdl_nlen = namelen; 434 sdl->sdl_index = ifp->if_index; 435 sdl->sdl_type = ifp->if_type; 436 ifaddr_byindex(ifp->if_index) = ifa; 437 ifa->ifa_ifp = ifp; 438 ifa->ifa_rtrequest = link_rtrequest; 439 ifa->ifa_addr = (struct sockaddr *)sdl; 440 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 441 ifa->ifa_netmask = (struct sockaddr *)sdl; 442 sdl->sdl_len = masklen; 443 while (namelen != 0) 444 sdl->sdl_data[--namelen] = 0xff; 445 ifa->ifa_refcnt = 1; 446 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 447 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 448 ifp->if_snd.altq_type = 0; 449 ifp->if_snd.altq_disc = NULL; 450 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 451 ifp->if_snd.altq_tbr = NULL; 452 ifp->if_snd.altq_ifp = ifp; 453 454 if (domains) 455 if_attachdomain1(ifp); 456 457 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 458 459 /* Announce the interface. */ 460 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 461} 462 463static void 464if_attachdomain(void *dummy) 465{ 466 struct ifnet *ifp; 467 int s; 468 469 s = splnet(); 470 TAILQ_FOREACH(ifp, &ifnet, if_link) 471 if_attachdomain1(ifp); 472 splx(s); 473} 474SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 475 if_attachdomain, NULL); 476 477static void 478if_attachdomain1(struct ifnet *ifp) 479{ 480 struct domain *dp; 481 int s; 482 483 s = splnet(); 484 485 /* 486 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 487 * cannot lock ifp->if_afdata initialization, entirely. 488 */ 489 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 490 splx(s); 491 return; 492 } 493 if (ifp->if_afdata_initialized) { 494 IF_AFDATA_UNLOCK(ifp); 495 splx(s); 496 return; 497 } 498 ifp->if_afdata_initialized = 1; 499 IF_AFDATA_UNLOCK(ifp); 500 501 /* address family dependent data region */ 502 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 503 for (dp = domains; dp; dp = dp->dom_next) { 504 if (dp->dom_ifattach) 505 ifp->if_afdata[dp->dom_family] = 506 (*dp->dom_ifattach)(ifp); 507 } 508 509 splx(s); 510} 511 512/* 513 * Detach an interface, removing it from the 514 * list of "active" interfaces. 515 */ 516void 517if_detach(struct ifnet *ifp) 518{ 519 struct ifaddr *ifa, *next; 520 struct radix_node_head *rnh; 521 int s; 522 int i; 523 struct domain *dp; 524 struct ifnet *iter; 525 int found; 526 527 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 528 /* 529 * Remove routes and flush queues. 530 */ 531 s = splnet(); 532 if_down(ifp); 533#ifdef ALTQ 534 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 535 altq_disable(&ifp->if_snd); 536 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 537 altq_detach(&ifp->if_snd); 538#endif 539 540 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; ifa = next) { 541 next = TAILQ_NEXT(ifa, ifa_link); 542 543 if (ifa->ifa_addr->sa_family == AF_LINK) 544 continue; 545#ifdef INET 546 /* XXX: Ugly!! ad hoc just for INET */ 547 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 548 struct ifaliasreq ifr; 549 550 bzero(&ifr, sizeof(ifr)); 551 ifr.ifra_addr = *ifa->ifa_addr; 552 if (ifa->ifa_dstaddr) 553 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 554 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 555 NULL) == 0) 556 continue; 557 } 558#endif /* INET */ 559#ifdef INET6 560 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 561 in6_purgeaddr(ifa); 562 /* ifp_addrhead is already updated */ 563 continue; 564 } 565#endif /* INET6 */ 566 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 567 IFAFREE(ifa); 568 } 569 570#ifdef INET6 571 /* 572 * Remove all IPv6 kernel structs related to ifp. This should be done 573 * before removing routing entries below, since IPv6 interface direct 574 * routes are expected to be removed by the IPv6-specific kernel API. 575 * Otherwise, the kernel will detect some inconsistency and bark it. 576 */ 577 in6_ifdetach(ifp); 578#endif 579 /* 580 * Remove address from ifindex_table[] and maybe decrement if_index. 581 * Clean up all addresses. 582 */ 583 ifnet_byindex(ifp->if_index) = NULL; 584 ifaddr_byindex(ifp->if_index) = NULL; 585 destroy_dev(ifdev_byindex(ifp->if_index)); 586 ifdev_byindex(ifp->if_index) = NULL; 587 588 while (if_index > 0 && ifaddr_byindex(if_index) == NULL) 589 if_index--; 590 591 592 /* We can now free link ifaddr. */ 593 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 594 ifa = TAILQ_FIRST(&ifp->if_addrhead); 595 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 596 IFAFREE(ifa); 597 } 598 599 /* 600 * Delete all remaining routes using this interface 601 * Unfortuneatly the only way to do this is to slog through 602 * the entire routing table looking for routes which point 603 * to this interface...oh well... 604 */ 605 for (i = 1; i <= AF_MAX; i++) { 606 if ((rnh = rt_tables[i]) == NULL) 607 continue; 608 RADIX_NODE_HEAD_LOCK(rnh); 609 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 610 RADIX_NODE_HEAD_UNLOCK(rnh); 611 } 612 613 /* Announce that the interface is gone. */ 614 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 615 616 IF_AFDATA_LOCK(ifp); 617 for (dp = domains; dp; dp = dp->dom_next) { 618 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 619 (*dp->dom_ifdetach)(ifp, 620 ifp->if_afdata[dp->dom_family]); 621 } 622 IF_AFDATA_UNLOCK(ifp); 623 624#ifdef MAC 625 mac_destroy_ifnet(ifp); 626#endif /* MAC */ 627 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 628 knlist_clear(&ifp->if_klist, 0); 629 knlist_destroy(&ifp->if_klist); 630 IFNET_WLOCK(); 631 found = 0; 632 TAILQ_FOREACH(iter, &ifnet, if_link) 633 if (iter == ifp) { 634 found = 1; 635 break; 636 } 637 if (found) 638 TAILQ_REMOVE(&ifnet, ifp, if_link); 639 IFNET_WUNLOCK(); 640 mtx_destroy(&ifp->if_snd.ifq_mtx); 641 IF_AFDATA_DESTROY(ifp); 642 splx(s); 643} 644 645/* 646 * Delete Routes for a Network Interface 647 * 648 * Called for each routing entry via the rnh->rnh_walktree() call above 649 * to delete all route entries referencing a detaching network interface. 650 * 651 * Arguments: 652 * rn pointer to node in the routing table 653 * arg argument passed to rnh->rnh_walktree() - detaching interface 654 * 655 * Returns: 656 * 0 successful 657 * errno failed - reason indicated 658 * 659 */ 660static int 661if_rtdel(struct radix_node *rn, void *arg) 662{ 663 struct rtentry *rt = (struct rtentry *)rn; 664 struct ifnet *ifp = arg; 665 int err; 666 667 if (rt->rt_ifp == ifp) { 668 669 /* 670 * Protect (sorta) against walktree recursion problems 671 * with cloned routes 672 */ 673 if ((rt->rt_flags & RTF_UP) == 0) 674 return (0); 675 676 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 677 rt_mask(rt), rt->rt_flags, 678 (struct rtentry **) NULL); 679 if (err) { 680 log(LOG_WARNING, "if_rtdel: error %d\n", err); 681 } 682 } 683 684 return (0); 685} 686 687#define equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 688 689/* 690 * Locate an interface based on a complete address. 691 */ 692/*ARGSUSED*/ 693struct ifaddr * 694ifa_ifwithaddr(struct sockaddr *addr) 695{ 696 struct ifnet *ifp; 697 struct ifaddr *ifa; 698 699 IFNET_RLOCK(); 700 TAILQ_FOREACH(ifp, &ifnet, if_link) 701 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 702 if (ifa->ifa_addr->sa_family != addr->sa_family) 703 continue; 704 if (equal(addr, ifa->ifa_addr)) 705 goto done; 706 /* IP6 doesn't have broadcast */ 707 if ((ifp->if_flags & IFF_BROADCAST) && 708 ifa->ifa_broadaddr && 709 ifa->ifa_broadaddr->sa_len != 0 && 710 equal(ifa->ifa_broadaddr, addr)) 711 goto done; 712 } 713 ifa = NULL; 714done: 715 IFNET_RUNLOCK(); 716 return (ifa); 717} 718 719/* 720 * Locate the point to point interface with a given destination address. 721 */ 722/*ARGSUSED*/ 723struct ifaddr * 724ifa_ifwithdstaddr(struct sockaddr *addr) 725{ 726 struct ifnet *ifp; 727 struct ifaddr *ifa; 728 729 IFNET_RLOCK(); 730 TAILQ_FOREACH(ifp, &ifnet, if_link) { 731 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 732 continue; 733 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 734 if (ifa->ifa_addr->sa_family != addr->sa_family) 735 continue; 736 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 737 goto done; 738 } 739 } 740 ifa = NULL; 741done: 742 IFNET_RUNLOCK(); 743 return (ifa); 744} 745 746/* 747 * Find an interface on a specific network. If many, choice 748 * is most specific found. 749 */ 750struct ifaddr * 751ifa_ifwithnet(struct sockaddr *addr) 752{ 753 struct ifnet *ifp; 754 struct ifaddr *ifa; 755 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 756 u_int af = addr->sa_family; 757 char *addr_data = addr->sa_data, *cplim; 758 759 /* 760 * AF_LINK addresses can be looked up directly by their index number, 761 * so do that if we can. 762 */ 763 if (af == AF_LINK) { 764 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 765 if (sdl->sdl_index && sdl->sdl_index <= if_index) 766 return (ifaddr_byindex(sdl->sdl_index)); 767 } 768 769 /* 770 * Scan though each interface, looking for ones that have 771 * addresses in this address family. 772 */ 773 IFNET_RLOCK(); 774 TAILQ_FOREACH(ifp, &ifnet, if_link) { 775 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 776 char *cp, *cp2, *cp3; 777 778 if (ifa->ifa_addr->sa_family != af) 779next: continue; 780 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 781 /* 782 * This is a bit broken as it doesn't 783 * take into account that the remote end may 784 * be a single node in the network we are 785 * looking for. 786 * The trouble is that we don't know the 787 * netmask for the remote end. 788 */ 789 if (ifa->ifa_dstaddr != 0 790 && equal(addr, ifa->ifa_dstaddr)) 791 goto done; 792 } else { 793 /* 794 * if we have a special address handler, 795 * then use it instead of the generic one. 796 */ 797 if (ifa->ifa_claim_addr) { 798 if ((*ifa->ifa_claim_addr)(ifa, addr)) 799 goto done; 800 continue; 801 } 802 803 /* 804 * Scan all the bits in the ifa's address. 805 * If a bit dissagrees with what we are 806 * looking for, mask it with the netmask 807 * to see if it really matters. 808 * (A byte at a time) 809 */ 810 if (ifa->ifa_netmask == 0) 811 continue; 812 cp = addr_data; 813 cp2 = ifa->ifa_addr->sa_data; 814 cp3 = ifa->ifa_netmask->sa_data; 815 cplim = ifa->ifa_netmask->sa_len 816 + (char *)ifa->ifa_netmask; 817 while (cp3 < cplim) 818 if ((*cp++ ^ *cp2++) & *cp3++) 819 goto next; /* next address! */ 820 /* 821 * If the netmask of what we just found 822 * is more specific than what we had before 823 * (if we had one) then remember the new one 824 * before continuing to search 825 * for an even better one. 826 */ 827 if (ifa_maybe == 0 || 828 rn_refines((caddr_t)ifa->ifa_netmask, 829 (caddr_t)ifa_maybe->ifa_netmask)) 830 ifa_maybe = ifa; 831 } 832 } 833 } 834 ifa = ifa_maybe; 835done: 836 IFNET_RUNLOCK(); 837 return (ifa); 838} 839 840/* 841 * Find an interface address specific to an interface best matching 842 * a given address. 843 */ 844struct ifaddr * 845ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 846{ 847 struct ifaddr *ifa; 848 char *cp, *cp2, *cp3; 849 char *cplim; 850 struct ifaddr *ifa_maybe = 0; 851 u_int af = addr->sa_family; 852 853 if (af >= AF_MAX) 854 return (0); 855 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 856 if (ifa->ifa_addr->sa_family != af) 857 continue; 858 if (ifa_maybe == 0) 859 ifa_maybe = ifa; 860 if (ifa->ifa_netmask == 0) { 861 if (equal(addr, ifa->ifa_addr) || 862 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 863 goto done; 864 continue; 865 } 866 if (ifp->if_flags & IFF_POINTOPOINT) { 867 if (equal(addr, ifa->ifa_dstaddr)) 868 goto done; 869 } else { 870 cp = addr->sa_data; 871 cp2 = ifa->ifa_addr->sa_data; 872 cp3 = ifa->ifa_netmask->sa_data; 873 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 874 for (; cp3 < cplim; cp3++) 875 if ((*cp++ ^ *cp2++) & *cp3) 876 break; 877 if (cp3 == cplim) 878 goto done; 879 } 880 } 881 ifa = ifa_maybe; 882done: 883 return (ifa); 884} 885 886#include <net/route.h> 887 888/* 889 * Default action when installing a route with a Link Level gateway. 890 * Lookup an appropriate real ifa to point to. 891 * This should be moved to /sys/net/link.c eventually. 892 */ 893static void 894link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 895{ 896 struct ifaddr *ifa, *oifa; 897 struct sockaddr *dst; 898 struct ifnet *ifp; 899 900 RT_LOCK_ASSERT(rt); 901 902 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 903 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 904 return; 905 ifa = ifaof_ifpforaddr(dst, ifp); 906 if (ifa) { 907 IFAREF(ifa); /* XXX */ 908 oifa = rt->rt_ifa; 909 rt->rt_ifa = ifa; 910 IFAFREE(oifa); 911 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 912 ifa->ifa_rtrequest(cmd, rt, info); 913 } 914} 915 916/* 917 * Mark an interface down and notify protocols of 918 * the transition. 919 * NOTE: must be called at splnet or eqivalent. 920 */ 921static void 922if_unroute(struct ifnet *ifp, int flag, int fam) 923{ 924 struct ifaddr *ifa; 925 926 ifp->if_flags &= ~flag; 927 getmicrotime(&ifp->if_lastchange); 928 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 929 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 930 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 931 if_qflush(&ifp->if_snd); 932 rt_ifmsg(ifp); 933} 934 935/* 936 * Mark an interface up and notify protocols of 937 * the transition. 938 * NOTE: must be called at splnet or eqivalent. 939 */ 940static void 941if_route(struct ifnet *ifp, int flag, int fam) 942{ 943 struct ifaddr *ifa; 944 945 ifp->if_flags |= flag; 946 getmicrotime(&ifp->if_lastchange); 947 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 948 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 949 pfctlinput(PRC_IFUP, ifa->ifa_addr); 950 rt_ifmsg(ifp); 951#ifdef INET6 952 in6_if_up(ifp); 953#endif 954} 955 956/* 957 * Mark an interface down and notify protocols of 958 * the transition. 959 * NOTE: must be called at splnet or eqivalent. 960 */ 961void 962if_down(struct ifnet *ifp) 963{ 964 965 if_unroute(ifp, IFF_UP, AF_UNSPEC); 966} 967 968/* 969 * Mark an interface up and notify protocols of 970 * the transition. 971 * NOTE: must be called at splnet or eqivalent. 972 */ 973void 974if_up(struct ifnet *ifp) 975{ 976 977 if_route(ifp, IFF_UP, AF_UNSPEC); 978} 979 980/* 981 * Flush an interface queue. 982 */ 983static void 984if_qflush(struct ifaltq *ifq) 985{ 986 struct mbuf *m, *n; 987 988 IFQ_LOCK(ifq); 989#ifdef ALTQ 990 if (ALTQ_IS_ENABLED(ifq)) 991 ALTQ_PURGE(ifq); 992#endif 993 n = ifq->ifq_head; 994 while ((m = n) != 0) { 995 n = m->m_act; 996 m_freem(m); 997 } 998 ifq->ifq_head = 0; 999 ifq->ifq_tail = 0; 1000 ifq->ifq_len = 0; 1001 IFQ_UNLOCK(ifq); 1002} 1003 1004/* 1005 * Handle interface watchdog timer routines. Called 1006 * from softclock, we decrement timers (if set) and 1007 * call the appropriate interface routine on expiration. 1008 * 1009 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1010 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1011 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1012 */ 1013static void 1014if_slowtimo(void *arg) 1015{ 1016 struct ifnet *ifp; 1017 int s = splimp(); 1018 1019 IFNET_RLOCK(); 1020 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1021 if (ifp->if_timer == 0 || --ifp->if_timer) 1022 continue; 1023 if (ifp->if_watchdog) 1024 (*ifp->if_watchdog)(ifp); 1025 } 1026 IFNET_RUNLOCK(); 1027 splx(s); 1028 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1029} 1030 1031/* 1032 * Map interface name to 1033 * interface structure pointer. 1034 */ 1035struct ifnet * 1036ifunit(const char *name) 1037{ 1038 struct ifnet *ifp; 1039 1040 IFNET_RLOCK(); 1041 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1042 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1043 break; 1044 } 1045 IFNET_RUNLOCK(); 1046 return (ifp); 1047} 1048 1049/* 1050 * Hardware specific interface ioctls. 1051 */ 1052static int 1053ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1054{ 1055 struct ifreq *ifr; 1056 struct ifstat *ifs; 1057 int error = 0; 1058 int new_flags; 1059 size_t namelen, onamelen; 1060 char new_name[IFNAMSIZ]; 1061 struct ifaddr *ifa; 1062 struct sockaddr_dl *sdl; 1063 1064 ifr = (struct ifreq *)data; 1065 switch (cmd) { 1066 case SIOCGIFINDEX: 1067 ifr->ifr_index = ifp->if_index; 1068 break; 1069 1070 case SIOCGIFFLAGS: 1071 ifr->ifr_flags = ifp->if_flags & 0xffff; 1072 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1073 break; 1074 1075 case SIOCGIFCAP: 1076 ifr->ifr_reqcap = ifp->if_capabilities; 1077 ifr->ifr_curcap = ifp->if_capenable; 1078 break; 1079 1080#ifdef MAC 1081 case SIOCGIFMAC: 1082 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1083 break; 1084#endif 1085 1086 case SIOCGIFMETRIC: 1087 ifr->ifr_metric = ifp->if_metric; 1088 break; 1089 1090 case SIOCGIFMTU: 1091 ifr->ifr_mtu = ifp->if_mtu; 1092 break; 1093 1094 case SIOCGIFPHYS: 1095 ifr->ifr_phys = ifp->if_physical; 1096 break; 1097 1098 case SIOCSIFFLAGS: 1099 error = suser(td); 1100 if (error) 1101 return (error); 1102 new_flags = (ifr->ifr_flags & 0xffff) | 1103 (ifr->ifr_flagshigh << 16); 1104 if (ifp->if_flags & IFF_SMART) { 1105 /* Smart drivers twiddle their own routes */ 1106 } else if (ifp->if_flags & IFF_UP && 1107 (new_flags & IFF_UP) == 0) { 1108 int s = splimp(); 1109 if_down(ifp); 1110 splx(s); 1111 } else if (new_flags & IFF_UP && 1112 (ifp->if_flags & IFF_UP) == 0) { 1113 int s = splimp(); 1114 if_up(ifp); 1115 splx(s); 1116 } 1117 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1118 (new_flags &~ IFF_CANTCHANGE); 1119 if (new_flags & IFF_PPROMISC) { 1120 /* Permanently promiscuous mode requested */ 1121 ifp->if_flags |= IFF_PROMISC; 1122 } else if (ifp->if_pcount == 0) { 1123 ifp->if_flags &= ~IFF_PROMISC; 1124 } 1125 if (ifp->if_ioctl) { 1126 IFF_LOCKGIANT(ifp); 1127 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1128 IFF_UNLOCKGIANT(ifp); 1129 } 1130 getmicrotime(&ifp->if_lastchange); 1131 break; 1132 1133 case SIOCSIFCAP: 1134 error = suser(td); 1135 if (error) 1136 return (error); 1137 if (ifp->if_ioctl == NULL) 1138 return (EOPNOTSUPP); 1139 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1140 return (EINVAL); 1141 IFF_LOCKGIANT(ifp); 1142 error = (*ifp->if_ioctl)(ifp, cmd, data); 1143 IFF_UNLOCKGIANT(ifp); 1144 if (error == 0) 1145 getmicrotime(&ifp->if_lastchange); 1146 break; 1147 1148#ifdef MAC 1149 case SIOCSIFMAC: 1150 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1151 break; 1152#endif 1153 1154 case SIOCSIFNAME: 1155 error = suser(td); 1156 if (error != 0) 1157 return (error); 1158 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1159 if (error != 0) 1160 return (error); 1161 if (new_name[0] == '\0') 1162 return (EINVAL); 1163 if (ifunit(new_name) != NULL) 1164 return (EEXIST); 1165 1166 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1167 /* Announce the departure of the interface. */ 1168 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1169 1170 log(LOG_INFO, "%s: changing name to '%s'\n", 1171 ifp->if_xname, new_name); 1172 1173 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1174 ifa = ifaddr_byindex(ifp->if_index); 1175 IFA_LOCK(ifa); 1176 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1177 namelen = strlen(new_name); 1178 onamelen = sdl->sdl_nlen; 1179 /* 1180 * Move the address if needed. This is safe because we 1181 * allocate space for a name of length IFNAMSIZ when we 1182 * create this in if_attach(). 1183 */ 1184 if (namelen != onamelen) { 1185 bcopy(sdl->sdl_data + onamelen, 1186 sdl->sdl_data + namelen, sdl->sdl_alen); 1187 } 1188 bcopy(new_name, sdl->sdl_data, namelen); 1189 sdl->sdl_nlen = namelen; 1190 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1191 bzero(sdl->sdl_data, onamelen); 1192 while (namelen != 0) 1193 sdl->sdl_data[--namelen] = 0xff; 1194 IFA_UNLOCK(ifa); 1195 1196 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1197 /* Announce the return of the interface. */ 1198 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1199 break; 1200 1201 case SIOCSIFMETRIC: 1202 error = suser(td); 1203 if (error) 1204 return (error); 1205 ifp->if_metric = ifr->ifr_metric; 1206 getmicrotime(&ifp->if_lastchange); 1207 break; 1208 1209 case SIOCSIFPHYS: 1210 error = suser(td); 1211 if (error) 1212 return (error); 1213 if (ifp->if_ioctl == NULL) 1214 return (EOPNOTSUPP); 1215 IFF_LOCKGIANT(ifp); 1216 error = (*ifp->if_ioctl)(ifp, cmd, data); 1217 IFF_UNLOCKGIANT(ifp); 1218 if (error == 0) 1219 getmicrotime(&ifp->if_lastchange); 1220 break; 1221 1222 case SIOCSIFMTU: 1223 { 1224 u_long oldmtu = ifp->if_mtu; 1225 1226 error = suser(td); 1227 if (error) 1228 return (error); 1229 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1230 return (EINVAL); 1231 if (ifp->if_ioctl == NULL) 1232 return (EOPNOTSUPP); 1233 IFF_LOCKGIANT(ifp); 1234 error = (*ifp->if_ioctl)(ifp, cmd, data); 1235 IFF_UNLOCKGIANT(ifp); 1236 if (error == 0) { 1237 getmicrotime(&ifp->if_lastchange); 1238 rt_ifmsg(ifp); 1239 } 1240 /* 1241 * If the link MTU changed, do network layer specific procedure. 1242 */ 1243 if (ifp->if_mtu != oldmtu) { 1244#ifdef INET6 1245 nd6_setmtu(ifp); 1246#endif 1247 } 1248 break; 1249 } 1250 1251 case SIOCADDMULTI: 1252 case SIOCDELMULTI: 1253 error = suser(td); 1254 if (error) 1255 return (error); 1256 1257 /* Don't allow group membership on non-multicast interfaces. */ 1258 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1259 return (EOPNOTSUPP); 1260 1261 /* Don't let users screw up protocols' entries. */ 1262 if (ifr->ifr_addr.sa_family != AF_LINK) 1263 return (EINVAL); 1264 1265 if (cmd == SIOCADDMULTI) { 1266 struct ifmultiaddr *ifma; 1267 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1268 } else { 1269 error = if_delmulti(ifp, &ifr->ifr_addr); 1270 } 1271 if (error == 0) 1272 getmicrotime(&ifp->if_lastchange); 1273 break; 1274 1275 case SIOCSIFPHYADDR: 1276 case SIOCDIFPHYADDR: 1277#ifdef INET6 1278 case SIOCSIFPHYADDR_IN6: 1279#endif 1280 case SIOCSLIFPHYADDR: 1281 case SIOCSIFMEDIA: 1282 case SIOCSIFGENERIC: 1283 error = suser(td); 1284 if (error) 1285 return (error); 1286 if (ifp->if_ioctl == NULL) 1287 return (EOPNOTSUPP); 1288 IFF_LOCKGIANT(ifp); 1289 error = (*ifp->if_ioctl)(ifp, cmd, data); 1290 IFF_UNLOCKGIANT(ifp); 1291 if (error == 0) 1292 getmicrotime(&ifp->if_lastchange); 1293 break; 1294 1295 case SIOCGIFSTATUS: 1296 ifs = (struct ifstat *)data; 1297 ifs->ascii[0] = '\0'; 1298 1299 case SIOCGIFPSRCADDR: 1300 case SIOCGIFPDSTADDR: 1301 case SIOCGLIFPHYADDR: 1302 case SIOCGIFMEDIA: 1303 case SIOCGIFGENERIC: 1304 if (ifp->if_ioctl == NULL) 1305 return (EOPNOTSUPP); 1306 IFF_LOCKGIANT(ifp); 1307 error = (*ifp->if_ioctl)(ifp, cmd, data); 1308 IFF_UNLOCKGIANT(ifp); 1309 break; 1310 1311 case SIOCSIFLLADDR: 1312 error = suser(td); 1313 if (error) 1314 return (error); 1315 error = if_setlladdr(ifp, 1316 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1317 break; 1318 1319 default: 1320 error = ENOIOCTL; 1321 break; 1322 } 1323 return (error); 1324} 1325 1326/* 1327 * Interface ioctls. 1328 */ 1329int 1330ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1331{ 1332 struct ifnet *ifp; 1333 struct ifreq *ifr; 1334 int error; 1335 int oif_flags; 1336 1337 switch (cmd) { 1338 case SIOCGIFCONF: 1339 case OSIOCGIFCONF: 1340 return (ifconf(cmd, data)); 1341 } 1342 ifr = (struct ifreq *)data; 1343 1344 switch (cmd) { 1345 case SIOCIFCREATE: 1346 case SIOCIFDESTROY: 1347 if ((error = suser(td)) != 0) 1348 return (error); 1349 return ((cmd == SIOCIFCREATE) ? 1350 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1351 if_clone_destroy(ifr->ifr_name)); 1352 1353 case SIOCIFGCLONERS: 1354 return (if_clone_list((struct if_clonereq *)data)); 1355 } 1356 1357 ifp = ifunit(ifr->ifr_name); 1358 if (ifp == 0) 1359 return (ENXIO); 1360 1361 error = ifhwioctl(cmd, ifp, data, td); 1362 if (error != ENOIOCTL) 1363 return (error); 1364 1365 oif_flags = ifp->if_flags; 1366 if (so->so_proto == 0) 1367 return (EOPNOTSUPP); 1368#ifndef COMPAT_43 1369 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1370 data, 1371 ifp, td)); 1372#else 1373 { 1374 int ocmd = cmd; 1375 1376 switch (cmd) { 1377 1378 case SIOCSIFDSTADDR: 1379 case SIOCSIFADDR: 1380 case SIOCSIFBRDADDR: 1381 case SIOCSIFNETMASK: 1382#if BYTE_ORDER != BIG_ENDIAN 1383 if (ifr->ifr_addr.sa_family == 0 && 1384 ifr->ifr_addr.sa_len < 16) { 1385 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1386 ifr->ifr_addr.sa_len = 16; 1387 } 1388#else 1389 if (ifr->ifr_addr.sa_len == 0) 1390 ifr->ifr_addr.sa_len = 16; 1391#endif 1392 break; 1393 1394 case OSIOCGIFADDR: 1395 cmd = SIOCGIFADDR; 1396 break; 1397 1398 case OSIOCGIFDSTADDR: 1399 cmd = SIOCGIFDSTADDR; 1400 break; 1401 1402 case OSIOCGIFBRDADDR: 1403 cmd = SIOCGIFBRDADDR; 1404 break; 1405 1406 case OSIOCGIFNETMASK: 1407 cmd = SIOCGIFNETMASK; 1408 } 1409 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1410 cmd, 1411 data, 1412 ifp, td)); 1413 switch (ocmd) { 1414 1415 case OSIOCGIFADDR: 1416 case OSIOCGIFDSTADDR: 1417 case OSIOCGIFBRDADDR: 1418 case OSIOCGIFNETMASK: 1419 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1420 1421 } 1422 } 1423#endif /* COMPAT_43 */ 1424 1425 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1426#ifdef INET6 1427 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1428 if (ifp->if_flags & IFF_UP) { 1429 int s = splimp(); 1430 in6_if_up(ifp); 1431 splx(s); 1432 } 1433#endif 1434 } 1435 return (error); 1436} 1437 1438/* 1439 * Set/clear promiscuous mode on interface ifp based on the truth value 1440 * of pswitch. The calls are reference counted so that only the first 1441 * "on" request actually has an effect, as does the final "off" request. 1442 * Results are undefined if the "off" and "on" requests are not matched. 1443 */ 1444int 1445ifpromisc(struct ifnet *ifp, int pswitch) 1446{ 1447 struct ifreq ifr; 1448 int error; 1449 int oldflags, oldpcount; 1450 1451 oldpcount = ifp->if_pcount; 1452 oldflags = ifp->if_flags; 1453 if (ifp->if_flags & IFF_PPROMISC) { 1454 /* Do nothing if device is in permanently promiscuous mode */ 1455 ifp->if_pcount += pswitch ? 1 : -1; 1456 return (0); 1457 } 1458 if (pswitch) { 1459 /* 1460 * If the device is not configured up, we cannot put it in 1461 * promiscuous mode. 1462 */ 1463 if ((ifp->if_flags & IFF_UP) == 0) 1464 return (ENETDOWN); 1465 if (ifp->if_pcount++ != 0) 1466 return (0); 1467 ifp->if_flags |= IFF_PROMISC; 1468 } else { 1469 if (--ifp->if_pcount > 0) 1470 return (0); 1471 ifp->if_flags &= ~IFF_PROMISC; 1472 } 1473 ifr.ifr_flags = ifp->if_flags & 0xffff; 1474 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1475 IFF_LOCKGIANT(ifp); 1476 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1477 IFF_UNLOCKGIANT(ifp); 1478 if (error == 0) { 1479 log(LOG_INFO, "%s: promiscuous mode %s\n", 1480 ifp->if_xname, 1481 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1482 rt_ifmsg(ifp); 1483 } else { 1484 ifp->if_pcount = oldpcount; 1485 ifp->if_flags = oldflags; 1486 } 1487 return error; 1488} 1489 1490/* 1491 * Return interface configuration 1492 * of system. List may be used 1493 * in later ioctl's (above) to get 1494 * other information. 1495 */ 1496/*ARGSUSED*/ 1497static int 1498ifconf(u_long cmd, caddr_t data) 1499{ 1500 struct ifconf *ifc = (struct ifconf *)data; 1501 struct ifnet *ifp; 1502 struct ifaddr *ifa; 1503 struct ifreq ifr; 1504 struct sbuf *sb; 1505 int error, full = 0, valid_len, max_len; 1506 1507 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 1508 max_len = MAXPHYS - 1; 1509 1510again: 1511 if (ifc->ifc_len <= max_len) { 1512 max_len = ifc->ifc_len; 1513 full = 1; 1514 } 1515 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 1516 max_len = 0; 1517 valid_len = 0; 1518 1519 IFNET_RLOCK(); /* could sleep XXX */ 1520 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1521 int addrs; 1522 1523 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1524 >= sizeof(ifr.ifr_name)) 1525 return (ENAMETOOLONG); 1526 1527 addrs = 0; 1528 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1529 struct sockaddr *sa = ifa->ifa_addr; 1530 1531 if (jailed(curthread->td_ucred) && 1532 prison_if(curthread->td_ucred, sa)) 1533 continue; 1534 addrs++; 1535#ifdef COMPAT_43 1536 if (cmd == OSIOCGIFCONF) { 1537 struct osockaddr *osa = 1538 (struct osockaddr *)&ifr.ifr_addr; 1539 ifr.ifr_addr = *sa; 1540 osa->sa_family = sa->sa_family; 1541 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1542 max_len += sizeof(ifr); 1543 } else 1544#endif 1545 if (sa->sa_len <= sizeof(*sa)) { 1546 ifr.ifr_addr = *sa; 1547 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1548 max_len += sizeof(ifr); 1549 } else { 1550 sbuf_bcat(sb, &ifr, 1551 offsetof(struct ifreq, ifr_addr)); 1552 max_len += offsetof(struct ifreq, ifr_addr); 1553 sbuf_bcat(sb, sa, sa->sa_len); 1554 max_len += sa->sa_len; 1555 } 1556 1557 if (!sbuf_overflowed(sb)) 1558 valid_len = sbuf_len(sb); 1559 } 1560 if (addrs == 0) { 1561 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1562 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1563 max_len += sizeof(ifr); 1564 1565 if (!sbuf_overflowed(sb)) 1566 valid_len = sbuf_len(sb); 1567 } 1568 } 1569 IFNET_RUNLOCK(); 1570 1571 /* 1572 * If we didn't allocate enough space (uncommon), try again. If 1573 * we have already allocated as much space as we are allowed, 1574 * return what we've got. 1575 */ 1576 if (valid_len != max_len && !full) { 1577 sbuf_delete(sb); 1578 goto again; 1579 } 1580 1581 ifc->ifc_len = valid_len; 1582 sbuf_finish(sb); 1583 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 1584 sbuf_delete(sb); 1585 return (error); 1586} 1587 1588/* 1589 * Just like if_promisc(), but for all-multicast-reception mode. 1590 */ 1591int 1592if_allmulti(struct ifnet *ifp, int onswitch) 1593{ 1594 int error = 0; 1595 int s = splimp(); 1596 struct ifreq ifr; 1597 1598 if (onswitch) { 1599 if (ifp->if_amcount++ == 0) { 1600 ifp->if_flags |= IFF_ALLMULTI; 1601 ifr.ifr_flags = ifp->if_flags & 0xffff; 1602 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1603 IFF_LOCKGIANT(ifp); 1604 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1605 IFF_UNLOCKGIANT(ifp); 1606 } 1607 } else { 1608 if (ifp->if_amcount > 1) { 1609 ifp->if_amcount--; 1610 } else { 1611 ifp->if_amcount = 0; 1612 ifp->if_flags &= ~IFF_ALLMULTI; 1613 ifr.ifr_flags = ifp->if_flags & 0xffff;; 1614 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1615 IFF_LOCKGIANT(ifp); 1616 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1617 IFF_UNLOCKGIANT(ifp); 1618 } 1619 } 1620 splx(s); 1621 1622 if (error == 0) 1623 rt_ifmsg(ifp); 1624 return error; 1625} 1626 1627/* 1628 * Add a multicast listenership to the interface in question. 1629 * The link layer provides a routine which converts 1630 */ 1631int 1632if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma) 1633{ 1634 struct sockaddr *llsa, *dupsa; 1635 int error, s; 1636 struct ifmultiaddr *ifma; 1637 1638 /* 1639 * If the matching multicast address already exists 1640 * then don't add a new one, just add a reference 1641 */ 1642 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1643 if (equal(sa, ifma->ifma_addr)) { 1644 ifma->ifma_refcount++; 1645 if (retifma) 1646 *retifma = ifma; 1647 return 0; 1648 } 1649 } 1650 1651 /* 1652 * Give the link layer a chance to accept/reject it, and also 1653 * find out which AF_LINK address this maps to, if it isn't one 1654 * already. 1655 */ 1656 if (ifp->if_resolvemulti) { 1657 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1658 if (error) return error; 1659 } else { 1660 llsa = 0; 1661 } 1662 1663 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1664 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1665 bcopy(sa, dupsa, sa->sa_len); 1666 1667 ifma->ifma_addr = dupsa; 1668 ifma->ifma_lladdr = llsa; 1669 ifma->ifma_ifp = ifp; 1670 ifma->ifma_refcount = 1; 1671 ifma->ifma_protospec = 0; 1672 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1673 1674 /* 1675 * Some network interfaces can scan the address list at 1676 * interrupt time; lock them out. 1677 */ 1678 s = splimp(); 1679 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1680 splx(s); 1681 if (retifma != NULL) 1682 *retifma = ifma; 1683 1684 if (llsa != 0) { 1685 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1686 if (equal(ifma->ifma_addr, llsa)) 1687 break; 1688 } 1689 if (ifma) { 1690 ifma->ifma_refcount++; 1691 } else { 1692 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1693 M_IFMADDR, M_WAITOK); 1694 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1695 M_IFMADDR, M_WAITOK); 1696 bcopy(llsa, dupsa, llsa->sa_len); 1697 ifma->ifma_addr = dupsa; 1698 ifma->ifma_lladdr = NULL; 1699 ifma->ifma_ifp = ifp; 1700 ifma->ifma_refcount = 1; 1701 ifma->ifma_protospec = 0; 1702 s = splimp(); 1703 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1704 splx(s); 1705 } 1706 } 1707 /* 1708 * We are certain we have added something, so call down to the 1709 * interface to let them know about it. 1710 */ 1711 s = splimp(); 1712 IFF_LOCKGIANT(ifp); 1713 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1714 IFF_UNLOCKGIANT(ifp); 1715 splx(s); 1716 1717 return 0; 1718} 1719 1720/* 1721 * Remove a reference to a multicast address on this interface. Yell 1722 * if the request does not match an existing membership. 1723 */ 1724int 1725if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1726{ 1727 struct ifmultiaddr *ifma; 1728 int s; 1729 1730 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1731 if (equal(sa, ifma->ifma_addr)) 1732 break; 1733 if (ifma == 0) 1734 return ENOENT; 1735 1736 if (ifma->ifma_refcount > 1) { 1737 ifma->ifma_refcount--; 1738 return 0; 1739 } 1740 1741 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1742 sa = ifma->ifma_lladdr; 1743 s = splimp(); 1744 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1745 /* 1746 * Make sure the interface driver is notified 1747 * in the case of a link layer mcast group being left. 1748 */ 1749 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) { 1750 IFF_LOCKGIANT(ifp); 1751 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1752 IFF_UNLOCKGIANT(ifp); 1753 } 1754 splx(s); 1755 free(ifma->ifma_addr, M_IFMADDR); 1756 free(ifma, M_IFMADDR); 1757 if (sa == 0) 1758 return 0; 1759 1760 /* 1761 * Now look for the link-layer address which corresponds to 1762 * this network address. It had been squirreled away in 1763 * ifma->ifma_lladdr for this purpose (so we don't have 1764 * to call ifp->if_resolvemulti() again), and we saved that 1765 * value in sa above. If some nasty deleted the 1766 * link-layer address out from underneath us, we can deal because 1767 * the address we stored was is not the same as the one which was 1768 * in the record for the link-layer address. (So we don't complain 1769 * in that case.) 1770 */ 1771 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1772 if (equal(sa, ifma->ifma_addr)) 1773 break; 1774 if (ifma == 0) 1775 return 0; 1776 1777 if (ifma->ifma_refcount > 1) { 1778 ifma->ifma_refcount--; 1779 return 0; 1780 } 1781 1782 s = splimp(); 1783 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1784 IFF_LOCKGIANT(ifp); 1785 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1786 IFF_UNLOCKGIANT(ifp); 1787 splx(s); 1788 free(ifma->ifma_addr, M_IFMADDR); 1789 free(sa, M_IFMADDR); 1790 free(ifma, M_IFMADDR); 1791 1792 return 0; 1793} 1794 1795/* 1796 * Set the link layer address on an interface. 1797 * 1798 * At this time we only support certain types of interfaces, 1799 * and we don't allow the length of the address to change. 1800 */ 1801int 1802if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1803{ 1804 struct sockaddr_dl *sdl; 1805 struct ifaddr *ifa; 1806 struct ifreq ifr; 1807 1808 ifa = ifaddr_byindex(ifp->if_index); 1809 if (ifa == NULL) 1810 return (EINVAL); 1811 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1812 if (sdl == NULL) 1813 return (EINVAL); 1814 if (len != sdl->sdl_alen) /* don't allow length to change */ 1815 return (EINVAL); 1816 switch (ifp->if_type) { 1817 case IFT_ETHER: /* these types use struct arpcom */ 1818 case IFT_FDDI: 1819 case IFT_XETHER: 1820 case IFT_ISO88025: 1821 case IFT_L2VLAN: 1822 bcopy(lladdr, IFP2AC(ifp)->ac_enaddr, len); 1823 /* 1824 * XXX We also need to store the lladdr in LLADDR(sdl), 1825 * which is done below. This is a pain because we must 1826 * remember to keep the info in sync. 1827 */ 1828 /* FALLTHROUGH */ 1829 case IFT_ARCNET: 1830 bcopy(lladdr, LLADDR(sdl), len); 1831 break; 1832 default: 1833 return (ENODEV); 1834 } 1835 /* 1836 * If the interface is already up, we need 1837 * to re-init it in order to reprogram its 1838 * address filter. 1839 */ 1840 if ((ifp->if_flags & IFF_UP) != 0) { 1841 IFF_LOCKGIANT(ifp); 1842 ifp->if_flags &= ~IFF_UP; 1843 ifr.ifr_flags = ifp->if_flags & 0xffff; 1844 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1845 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1846 ifp->if_flags |= IFF_UP; 1847 ifr.ifr_flags = ifp->if_flags & 0xffff; 1848 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1849 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1850 IFF_UNLOCKGIANT(ifp); 1851#ifdef INET 1852 /* 1853 * Also send gratuitous ARPs to notify other nodes about 1854 * the address change. 1855 */ 1856 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1857 if (ifa->ifa_addr != NULL && 1858 ifa->ifa_addr->sa_family == AF_INET) 1859 arp_ifinit(ifp, ifa); 1860 } 1861#endif 1862 } 1863 return (0); 1864} 1865 1866struct ifmultiaddr * 1867ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 1868{ 1869 struct ifmultiaddr *ifma; 1870 1871 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1872 if (equal(ifma->ifma_addr, sa)) 1873 break; 1874 1875 return ifma; 1876} 1877 1878/* 1879 * The name argument must be a pointer to storage which will last as 1880 * long as the interface does. For physical devices, the result of 1881 * device_get_name(dev) is a good choice and for pseudo-devices a 1882 * static string works well. 1883 */ 1884void 1885if_initname(struct ifnet *ifp, const char *name, int unit) 1886{ 1887 ifp->if_dname = name; 1888 ifp->if_dunit = unit; 1889 if (unit != IF_DUNIT_NONE) 1890 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 1891 else 1892 strlcpy(ifp->if_xname, name, IFNAMSIZ); 1893} 1894 1895int 1896if_printf(struct ifnet *ifp, const char * fmt, ...) 1897{ 1898 va_list ap; 1899 int retval; 1900 1901 retval = printf("%s: ", ifp->if_xname); 1902 va_start(ap, fmt); 1903 retval += vprintf(fmt, ap); 1904 va_end(ap); 1905 return (retval); 1906} 1907 1908/* 1909 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 1910 * be called without Giant. However, we often can't acquire the Giant lock 1911 * at those points; instead, we run it via a task queue that holds Giant via 1912 * if_start_deferred. 1913 * 1914 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 1915 * outstanding if_start_deferred() tasks that will run after the free. This 1916 * probably means waiting in if_detach(). 1917 */ 1918void 1919if_start(struct ifnet *ifp) 1920{ 1921 1922 NET_ASSERT_GIANT(); 1923 1924 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 1925 if (mtx_owned(&Giant)) 1926 (*(ifp)->if_start)(ifp); 1927 else 1928 taskqueue_enqueue(taskqueue_swi_giant, 1929 &ifp->if_starttask); 1930 } else 1931 (*(ifp)->if_start)(ifp); 1932} 1933 1934static void 1935if_start_deferred(void *context, int pending) 1936{ 1937 struct ifnet *ifp; 1938 1939 /* 1940 * This code must be entered with Giant, and should never run if 1941 * we're not running with debug.mpsafenet. 1942 */ 1943 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 1944 GIANT_REQUIRED; 1945 1946 ifp = (struct ifnet *)context; 1947 (ifp->if_start)(ifp); 1948} 1949 1950SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1951SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 1952