Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if.c
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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: releng/5.3/sys/net/if.c 145096 2005-04-15 01:53:14Z cperciva $ 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 82 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 83 84 static void if_attachdomain(void *); 85 static void if_attachdomain1(struct ifnet *); 86 static int ifconf(u_long, caddr_t); 87 static void if_grow(void); 88 static void if_init(void *); 89 static void if_check(void *); 90 static int if_findindex(struct ifnet *); 91 static void if_qflush(struct ifaltq *); 92 static void if_route(struct ifnet *, int flag, int fam); 93 static void if_slowtimo(void *); 94 static void if_unroute(struct ifnet *, int flag, int fam); 95 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 96 static int if_rtdel(struct radix_node *, void *); 97 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 98 static 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 */ 104 extern void nd6_setmtu(struct ifnet *); 105 #endif 106 107 int if_index = 0; 108 struct ifindex_entry *ifindex_table = NULL; 109 int ifqmaxlen = IFQ_MAXLEN; 110 struct ifnethead ifnet; /* depend on static init XXX */ 111 struct mtx ifnet_lock; 112 113 static int if_indexlim = 8; 114 static struct knlist ifklist; 115 116 static void filt_netdetach(struct knote *kn); 117 static int filt_netdev(struct knote *kn, long hint); 118 119 static struct filterops netdev_filtops = 120 { 1, NULL, filt_netdetach, filt_netdev }; 121 122 /* 123 * System initialization 124 */ 125 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 126 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 127 128 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 129 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 130 131 static d_open_t netopen; 132 static d_close_t netclose; 133 static d_ioctl_t netioctl; 134 static d_kqfilter_t netkqfilter; 135 136 static 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 }; 145 146 static int 147 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 148 { 149 return (0); 150 } 151 152 static int 153 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 154 { 155 return (0); 156 } 157 158 static int 159 netioctl(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 } 186 187 static int 188 netkqfilter(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 } 218 219 static void 220 filt_netdetach(struct knote *kn) 221 { 222 struct knlist *klist = (struct knlist *)kn->kn_hook; 223 224 knlist_remove(klist, kn, 0); 225 } 226 227 static int 228 filt_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*/ 255 static void 256 if_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 } 267 268 static void 269 if_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*/ 285 static void 286 if_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 } 309 310 static int 311 if_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; 341 found: 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 */ 363 void 364 if_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 } 462 463 static void 464 if_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 } 474 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 475 if_attachdomain, NULL); 476 477 static void 478 if_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 */ 516 void 517 if_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 */ 660 static int 661 if_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*/ 693 struct ifaddr * 694 ifa_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; 714 done: 715 IFNET_RUNLOCK(); 716 return (ifa); 717 } 718 719 /* 720 * Locate the point to point interface with a given destination address. 721 */ 722 /*ARGSUSED*/ 723 struct ifaddr * 724 ifa_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; 741 done: 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 */ 750 struct ifaddr * 751 ifa_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) 779 next: 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; 835 done: 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 */ 844 struct ifaddr * 845 ifaof_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; 882 done: 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 */ 893 static void 894 link_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 */ 921 static void 922 if_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 */ 940 static void 941 if_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 */ 961 void 962 if_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 */ 973 void 974 if_up(struct ifnet *ifp) 975 { 976 977 if_route(ifp, IFF_UP, AF_UNSPEC); 978 } 979 980 /* 981 * Flush an interface queue. 982 */ 983 static void 984 if_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 */ 1013 static void 1014 if_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 */ 1035 struct ifnet * 1036 ifunit(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 */ 1052 static int 1053 ifhwioctl(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 */ 1329 int 1330 ifioctl(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 */ 1444 int 1445 ifpromisc(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*/ 1497 static int 1498 ifconf(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 1510 again: 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 /* 1524 * Zero the ifr_name buffer to make sure we don't 1525 * disclose the contents of the stack. 1526 */ 1527 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 1528 1529 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1530 >= sizeof(ifr.ifr_name)) 1531 return (ENAMETOOLONG); 1532 1533 addrs = 0; 1534 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1535 struct sockaddr *sa = ifa->ifa_addr; 1536 1537 if (jailed(curthread->td_ucred) && 1538 prison_if(curthread->td_ucred, sa)) 1539 continue; 1540 addrs++; 1541 #ifdef COMPAT_43 1542 if (cmd == OSIOCGIFCONF) { 1543 struct osockaddr *osa = 1544 (struct osockaddr *)&ifr.ifr_addr; 1545 ifr.ifr_addr = *sa; 1546 osa->sa_family = sa->sa_family; 1547 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1548 max_len += sizeof(ifr); 1549 } else 1550 #endif 1551 if (sa->sa_len <= sizeof(*sa)) { 1552 ifr.ifr_addr = *sa; 1553 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1554 max_len += sizeof(ifr); 1555 } else { 1556 sbuf_bcat(sb, &ifr, 1557 offsetof(struct ifreq, ifr_addr)); 1558 max_len += offsetof(struct ifreq, ifr_addr); 1559 sbuf_bcat(sb, sa, sa->sa_len); 1560 max_len += sa->sa_len; 1561 } 1562 1563 if (!sbuf_overflowed(sb)) 1564 valid_len = sbuf_len(sb); 1565 } 1566 if (addrs == 0) { 1567 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1568 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1569 max_len += sizeof(ifr); 1570 1571 if (!sbuf_overflowed(sb)) 1572 valid_len = sbuf_len(sb); 1573 } 1574 } 1575 IFNET_RUNLOCK(); 1576 1577 /* 1578 * If we didn't allocate enough space (uncommon), try again. If 1579 * we have already allocated as much space as we are allowed, 1580 * return what we've got. 1581 */ 1582 if (valid_len != max_len && !full) { 1583 sbuf_delete(sb); 1584 goto again; 1585 } 1586 1587 ifc->ifc_len = valid_len; 1588 sbuf_finish(sb); 1589 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 1590 sbuf_delete(sb); 1591 return (error); 1592 } 1593 1594 /* 1595 * Just like if_promisc(), but for all-multicast-reception mode. 1596 */ 1597 int 1598 if_allmulti(struct ifnet *ifp, int onswitch) 1599 { 1600 int error = 0; 1601 int s = splimp(); 1602 struct ifreq ifr; 1603 1604 if (onswitch) { 1605 if (ifp->if_amcount++ == 0) { 1606 ifp->if_flags |= IFF_ALLMULTI; 1607 ifr.ifr_flags = ifp->if_flags & 0xffff; 1608 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1609 IFF_LOCKGIANT(ifp); 1610 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1611 IFF_UNLOCKGIANT(ifp); 1612 } 1613 } else { 1614 if (ifp->if_amcount > 1) { 1615 ifp->if_amcount--; 1616 } else { 1617 ifp->if_amcount = 0; 1618 ifp->if_flags &= ~IFF_ALLMULTI; 1619 ifr.ifr_flags = ifp->if_flags & 0xffff;; 1620 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1621 IFF_LOCKGIANT(ifp); 1622 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1623 IFF_UNLOCKGIANT(ifp); 1624 } 1625 } 1626 splx(s); 1627 1628 if (error == 0) 1629 rt_ifmsg(ifp); 1630 return error; 1631 } 1632 1633 /* 1634 * Add a multicast listenership to the interface in question. 1635 * The link layer provides a routine which converts 1636 */ 1637 int 1638 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma) 1639 { 1640 struct sockaddr *llsa, *dupsa; 1641 int error, s; 1642 struct ifmultiaddr *ifma; 1643 1644 /* 1645 * If the matching multicast address already exists 1646 * then don't add a new one, just add a reference 1647 */ 1648 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1649 if (equal(sa, ifma->ifma_addr)) { 1650 ifma->ifma_refcount++; 1651 if (retifma) 1652 *retifma = ifma; 1653 return 0; 1654 } 1655 } 1656 1657 /* 1658 * Give the link layer a chance to accept/reject it, and also 1659 * find out which AF_LINK address this maps to, if it isn't one 1660 * already. 1661 */ 1662 if (ifp->if_resolvemulti) { 1663 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1664 if (error) return error; 1665 } else { 1666 llsa = 0; 1667 } 1668 1669 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1670 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1671 bcopy(sa, dupsa, sa->sa_len); 1672 1673 ifma->ifma_addr = dupsa; 1674 ifma->ifma_lladdr = llsa; 1675 ifma->ifma_ifp = ifp; 1676 ifma->ifma_refcount = 1; 1677 ifma->ifma_protospec = 0; 1678 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1679 1680 /* 1681 * Some network interfaces can scan the address list at 1682 * interrupt time; lock them out. 1683 */ 1684 s = splimp(); 1685 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1686 splx(s); 1687 if (retifma != NULL) 1688 *retifma = ifma; 1689 1690 if (llsa != 0) { 1691 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1692 if (equal(ifma->ifma_addr, llsa)) 1693 break; 1694 } 1695 if (ifma) { 1696 ifma->ifma_refcount++; 1697 } else { 1698 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1699 M_IFMADDR, M_WAITOK); 1700 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1701 M_IFMADDR, M_WAITOK); 1702 bcopy(llsa, dupsa, llsa->sa_len); 1703 ifma->ifma_addr = dupsa; 1704 ifma->ifma_lladdr = NULL; 1705 ifma->ifma_ifp = ifp; 1706 ifma->ifma_refcount = 1; 1707 ifma->ifma_protospec = 0; 1708 s = splimp(); 1709 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1710 splx(s); 1711 } 1712 } 1713 /* 1714 * We are certain we have added something, so call down to the 1715 * interface to let them know about it. 1716 */ 1717 s = splimp(); 1718 IFF_LOCKGIANT(ifp); 1719 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1720 IFF_UNLOCKGIANT(ifp); 1721 splx(s); 1722 1723 return 0; 1724 } 1725 1726 /* 1727 * Remove a reference to a multicast address on this interface. Yell 1728 * if the request does not match an existing membership. 1729 */ 1730 int 1731 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1732 { 1733 struct ifmultiaddr *ifma; 1734 int s; 1735 1736 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1737 if (equal(sa, ifma->ifma_addr)) 1738 break; 1739 if (ifma == 0) 1740 return ENOENT; 1741 1742 if (ifma->ifma_refcount > 1) { 1743 ifma->ifma_refcount--; 1744 return 0; 1745 } 1746 1747 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1748 sa = ifma->ifma_lladdr; 1749 s = splimp(); 1750 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1751 /* 1752 * Make sure the interface driver is notified 1753 * in the case of a link layer mcast group being left. 1754 */ 1755 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) { 1756 IFF_LOCKGIANT(ifp); 1757 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1758 IFF_UNLOCKGIANT(ifp); 1759 } 1760 splx(s); 1761 free(ifma->ifma_addr, M_IFMADDR); 1762 free(ifma, M_IFMADDR); 1763 if (sa == 0) 1764 return 0; 1765 1766 /* 1767 * Now look for the link-layer address which corresponds to 1768 * this network address. It had been squirreled away in 1769 * ifma->ifma_lladdr for this purpose (so we don't have 1770 * to call ifp->if_resolvemulti() again), and we saved that 1771 * value in sa above. If some nasty deleted the 1772 * link-layer address out from underneath us, we can deal because 1773 * the address we stored was is not the same as the one which was 1774 * in the record for the link-layer address. (So we don't complain 1775 * in that case.) 1776 */ 1777 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1778 if (equal(sa, ifma->ifma_addr)) 1779 break; 1780 if (ifma == 0) 1781 return 0; 1782 1783 if (ifma->ifma_refcount > 1) { 1784 ifma->ifma_refcount--; 1785 return 0; 1786 } 1787 1788 s = splimp(); 1789 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1790 IFF_LOCKGIANT(ifp); 1791 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1792 IFF_UNLOCKGIANT(ifp); 1793 splx(s); 1794 free(ifma->ifma_addr, M_IFMADDR); 1795 free(sa, M_IFMADDR); 1796 free(ifma, M_IFMADDR); 1797 1798 return 0; 1799 } 1800 1801 /* 1802 * Set the link layer address on an interface. 1803 * 1804 * At this time we only support certain types of interfaces, 1805 * and we don't allow the length of the address to change. 1806 */ 1807 int 1808 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1809 { 1810 struct sockaddr_dl *sdl; 1811 struct ifaddr *ifa; 1812 struct ifreq ifr; 1813 1814 ifa = ifaddr_byindex(ifp->if_index); 1815 if (ifa == NULL) 1816 return (EINVAL); 1817 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1818 if (sdl == NULL) 1819 return (EINVAL); 1820 if (len != sdl->sdl_alen) /* don't allow length to change */ 1821 return (EINVAL); 1822 switch (ifp->if_type) { 1823 case IFT_ETHER: /* these types use struct arpcom */ 1824 case IFT_FDDI: 1825 case IFT_XETHER: 1826 case IFT_ISO88025: 1827 case IFT_L2VLAN: 1828 bcopy(lladdr, IFP2AC(ifp)->ac_enaddr, len); 1829 /* 1830 * XXX We also need to store the lladdr in LLADDR(sdl), 1831 * which is done below. This is a pain because we must 1832 * remember to keep the info in sync. 1833 */ 1834 /* FALLTHROUGH */ 1835 case IFT_ARCNET: 1836 bcopy(lladdr, LLADDR(sdl), len); 1837 break; 1838 default: 1839 return (ENODEV); 1840 } 1841 /* 1842 * If the interface is already up, we need 1843 * to re-init it in order to reprogram its 1844 * address filter. 1845 */ 1846 if ((ifp->if_flags & IFF_UP) != 0) { 1847 IFF_LOCKGIANT(ifp); 1848 ifp->if_flags &= ~IFF_UP; 1849 ifr.ifr_flags = ifp->if_flags & 0xffff; 1850 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1851 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1852 ifp->if_flags |= IFF_UP; 1853 ifr.ifr_flags = ifp->if_flags & 0xffff; 1854 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1855 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1856 IFF_UNLOCKGIANT(ifp); 1857 #ifdef INET 1858 /* 1859 * Also send gratuitous ARPs to notify other nodes about 1860 * the address change. 1861 */ 1862 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1863 if (ifa->ifa_addr != NULL && 1864 ifa->ifa_addr->sa_family == AF_INET) 1865 arp_ifinit(ifp, ifa); 1866 } 1867 #endif 1868 } 1869 return (0); 1870 } 1871 1872 struct ifmultiaddr * 1873 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 1874 { 1875 struct ifmultiaddr *ifma; 1876 1877 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1878 if (equal(ifma->ifma_addr, sa)) 1879 break; 1880 1881 return ifma; 1882 } 1883 1884 /* 1885 * The name argument must be a pointer to storage which will last as 1886 * long as the interface does. For physical devices, the result of 1887 * device_get_name(dev) is a good choice and for pseudo-devices a 1888 * static string works well. 1889 */ 1890 void 1891 if_initname(struct ifnet *ifp, const char *name, int unit) 1892 { 1893 ifp->if_dname = name; 1894 ifp->if_dunit = unit; 1895 if (unit != IF_DUNIT_NONE) 1896 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 1897 else 1898 strlcpy(ifp->if_xname, name, IFNAMSIZ); 1899 } 1900 1901 int 1902 if_printf(struct ifnet *ifp, const char * fmt, ...) 1903 { 1904 va_list ap; 1905 int retval; 1906 1907 retval = printf("%s: ", ifp->if_xname); 1908 va_start(ap, fmt); 1909 retval += vprintf(fmt, ap); 1910 va_end(ap); 1911 return (retval); 1912 } 1913 1914 /* 1915 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 1916 * be called without Giant. However, we often can't acquire the Giant lock 1917 * at those points; instead, we run it via a task queue that holds Giant via 1918 * if_start_deferred. 1919 * 1920 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 1921 * outstanding if_start_deferred() tasks that will run after the free. This 1922 * probably means waiting in if_detach(). 1923 */ 1924 void 1925 if_start(struct ifnet *ifp) 1926 { 1927 1928 NET_ASSERT_GIANT(); 1929 1930 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 1931 if (mtx_owned(&Giant)) 1932 (*(ifp)->if_start)(ifp); 1933 else 1934 taskqueue_enqueue(taskqueue_swi_giant, 1935 &ifp->if_starttask); 1936 } else 1937 (*(ifp)->if_start)(ifp); 1938 } 1939 1940 static void 1941 if_start_deferred(void *context, int pending) 1942 { 1943 struct ifnet *ifp; 1944 1945 /* 1946 * This code must be entered with Giant, and should never run if 1947 * we're not running with debug.mpsafenet. 1948 */ 1949 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 1950 GIANT_REQUIRED; 1951 1952 ifp = (struct ifnet *)context; 1953 (ifp->if_start)(ifp); 1954 } 1955 1956 int 1957 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 1958 { 1959 int active = 0; 1960 1961 IF_LOCK(ifq); 1962 if (_IF_QFULL(ifq)) { 1963 _IF_DROP(ifq); 1964 IF_UNLOCK(ifq); 1965 m_freem(m); 1966 return (0); 1967 } 1968 if (ifp != NULL) { 1969 ifp->if_obytes += m->m_pkthdr.len + adjust; 1970 if (m->m_flags & (M_BCAST|M_MCAST)) 1971 ifp->if_omcasts++; 1972 active = ifp->if_flags & IFF_OACTIVE; 1973 } 1974 _IF_ENQUEUE(ifq, m); 1975 IF_UNLOCK(ifq); 1976 if (ifp != NULL && !active) 1977 if_start(ifp); 1978 return (1); 1979 } 1980 1981 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1982 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
Cache object: acafa0a0068432f0fa503b7cb219e4d1
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