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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if.c 8.5 (Berkeley) 1/9/95 34 * $FreeBSD: releng/5.2/sys/net/if.c 121816 2003-10-31 18:32:15Z brooks $ 35 */ 36 37 #include "opt_compat.h" 38 #include "opt_inet6.h" 39 #include "opt_inet.h" 40 #include "opt_mac.h" 41 42 #include <sys/param.h> 43 #include <sys/conf.h> 44 #include <sys/mac.h> 45 #include <sys/malloc.h> 46 #include <sys/bus.h> 47 #include <sys/mbuf.h> 48 #include <sys/systm.h> 49 #include <sys/proc.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/protosw.h> 53 #include <sys/kernel.h> 54 #include <sys/sockio.h> 55 #include <sys/syslog.h> 56 #include <sys/sysctl.h> 57 #include <sys/domain.h> 58 #include <sys/jail.h> 59 #include <machine/stdarg.h> 60 61 #include <net/if.h> 62 #include <net/if_arp.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 static void if_attachdomain(void *); 83 static void if_attachdomain1(struct ifnet *); 84 static int ifconf(u_long, caddr_t); 85 static void if_grow(void); 86 static void if_init(void *); 87 static void if_check(void *); 88 static int if_findindex(struct ifnet *); 89 static void if_qflush(struct ifqueue *); 90 static void if_slowtimo(void *); 91 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 92 static int if_rtdel(struct radix_node *, void *); 93 static struct if_clone *if_clone_lookup(const char *, int *); 94 static int if_clone_list(struct if_clonereq *); 95 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 96 #ifdef INET6 97 /* 98 * XXX: declare here to avoid to include many inet6 related files.. 99 * should be more generalized? 100 */ 101 extern void nd6_setmtu(struct ifnet *); 102 #endif 103 104 int if_index = 0; 105 struct ifindex_entry *ifindex_table = NULL; 106 int ifqmaxlen = IFQ_MAXLEN; 107 struct ifnethead ifnet; /* depend on static init XXX */ 108 struct mtx ifnet_lock; 109 static int if_cloners_count; 110 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 111 112 static int if_indexlim = 8; 113 static struct klist ifklist; 114 115 static void filt_netdetach(struct knote *kn); 116 static int filt_netdev(struct knote *kn, long hint); 117 118 static struct filterops netdev_filtops = 119 { 1, NULL, filt_netdetach, filt_netdev }; 120 121 /* 122 * System initialization 123 */ 124 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 125 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 126 127 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 128 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 129 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework"); 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_open = netopen, 138 .d_close = netclose, 139 .d_ioctl = netioctl, 140 .d_name = "net", 141 .d_kqfilter = netkqfilter, 142 }; 143 144 static int 145 netopen(dev_t dev, int flag, int mode, struct thread *td) 146 { 147 return (0); 148 } 149 150 static int 151 netclose(dev_t dev, int flags, int fmt, struct thread *td) 152 { 153 return (0); 154 } 155 156 static int 157 netioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td) 158 { 159 struct ifnet *ifp; 160 int error, idx; 161 162 /* only support interface specific ioctls */ 163 if (IOCGROUP(cmd) != 'i') 164 return (EOPNOTSUPP); 165 idx = minor(dev); 166 if (idx == 0) { 167 /* 168 * special network device, not interface. 169 */ 170 if (cmd == SIOCGIFCONF) 171 return (ifconf(cmd, data)); /* XXX remove cmd */ 172 return (EOPNOTSUPP); 173 } 174 175 ifp = ifnet_byindex(idx); 176 if (ifp == NULL) 177 return (ENXIO); 178 179 error = ifhwioctl(cmd, ifp, data, td); 180 if (error == ENOIOCTL) 181 error = EOPNOTSUPP; 182 return (error); 183 } 184 185 static int 186 netkqfilter(dev_t dev, struct knote *kn) 187 { 188 struct klist *klist; 189 struct ifnet *ifp; 190 int idx; 191 192 idx = minor(dev); 193 if (idx == 0) { 194 klist = &ifklist; 195 } else { 196 ifp = ifnet_byindex(idx); 197 if (ifp == NULL) 198 return (1); 199 klist = &ifp->if_klist; 200 } 201 202 switch (kn->kn_filter) { 203 case EVFILT_NETDEV: 204 kn->kn_fop = &netdev_filtops; 205 break; 206 default: 207 return (1); 208 } 209 210 kn->kn_hook = (caddr_t)klist; 211 212 /* XXX locking? */ 213 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 214 215 return (0); 216 } 217 218 static void 219 filt_netdetach(struct knote *kn) 220 { 221 struct klist *klist = (struct klist *)kn->kn_hook; 222 223 if (kn->kn_status & KN_DETACHED) 224 return; 225 SLIST_REMOVE(klist, kn, knote, kn_selnext); 226 } 227 228 static int 229 filt_netdev(struct knote *kn, long hint) 230 { 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_status |= KN_DETACHED; 238 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 239 return (1); 240 } 241 kn->kn_data = hint; /* current status */ 242 if (kn->kn_sfflags & hint) 243 kn->kn_fflags |= hint; 244 return (kn->kn_fflags != 0); 245 } 246 247 /* 248 * Network interface utility routines. 249 * 250 * Routines with ifa_ifwith* names take sockaddr *'s as 251 * parameters. 252 */ 253 /* ARGSUSED*/ 254 static void 255 if_init(void *dummy __unused) 256 { 257 258 IFNET_LOCK_INIT(); 259 TAILQ_INIT(&ifnet); 260 SLIST_INIT(&ifklist); 261 if_grow(); /* create initial table */ 262 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 263 UID_ROOT, GID_WHEEL, 0600, "network"); 264 } 265 266 static void 267 if_grow(void) 268 { 269 u_int n; 270 struct ifindex_entry *e; 271 272 if_indexlim <<= 1; 273 n = if_indexlim * sizeof(*e); 274 e = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 275 if (ifindex_table != NULL) { 276 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 277 free((caddr_t)ifindex_table, M_IFADDR); 278 } 279 ifindex_table = e; 280 } 281 282 /* ARGSUSED*/ 283 static void 284 if_check(void *dummy __unused) 285 { 286 struct ifnet *ifp; 287 int s; 288 289 s = splimp(); 290 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 291 TAILQ_FOREACH(ifp, &ifnet, if_link) { 292 if (ifp->if_snd.ifq_maxlen == 0) { 293 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 294 ifp->if_snd.ifq_maxlen = ifqmaxlen; 295 } 296 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 297 if_printf(ifp, 298 "XXX: driver didn't initialize queue mtx\n"); 299 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 300 MTX_NETWORK_LOCK, MTX_DEF); 301 } 302 } 303 IFNET_RUNLOCK(); 304 splx(s); 305 if_slowtimo(0); 306 } 307 308 static int 309 if_findindex(struct ifnet *ifp) 310 { 311 int i, unit; 312 char eaddr[18], devname[32]; 313 const char *name, *p; 314 315 switch (ifp->if_type) { 316 case IFT_ETHER: /* these types use struct arpcom */ 317 case IFT_FDDI: 318 case IFT_XETHER: 319 case IFT_ISO88025: 320 case IFT_L2VLAN: 321 snprintf(eaddr, 18, "%6D", 322 ((struct arpcom *)ifp->if_softc)->ac_enaddr, ":"); 323 break; 324 default: 325 eaddr[0] = '\0'; 326 break; 327 } 328 strlcpy(devname, ifp->if_xname, sizeof(devname)); 329 name = net_cdevsw.d_name; 330 i = 0; 331 while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) { 332 if (resource_string_value(name, unit, "ether", &p) == 0) 333 if (strcmp(p, eaddr) == 0) 334 goto found; 335 if (resource_string_value(name, unit, "dev", &p) == 0) 336 if (strcmp(p, devname) == 0) 337 goto found; 338 } 339 unit = 0; 340 found: 341 if (unit != 0) { 342 if (ifaddr_byindex(unit) == NULL) 343 return (unit); 344 printf("%s%d in use, cannot hardwire it to %s.\n", 345 name, unit, devname); 346 } 347 for (unit = 1; ; unit++) { 348 if (unit <= if_index && ifaddr_byindex(unit) != NULL) 349 continue; 350 if (resource_string_value(name, unit, "ether", &p) == 0 || 351 resource_string_value(name, unit, "dev", &p) == 0) 352 continue; 353 break; 354 } 355 return (unit); 356 } 357 358 /* 359 * Attach an interface to the 360 * list of "active" interfaces. 361 */ 362 void 363 if_attach(struct ifnet *ifp) 364 { 365 unsigned socksize, ifasize; 366 int namelen, masklen; 367 struct sockaddr_dl *sdl; 368 struct ifaddr *ifa; 369 370 IF_AFDATA_LOCK_INIT(ifp); 371 ifp->if_afdata_initialized = 0; 372 IFNET_WLOCK(); 373 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 374 IFNET_WUNLOCK(); 375 /* 376 * XXX - 377 * The old code would work if the interface passed a pre-existing 378 * chain of ifaddrs to this code. We don't trust our callers to 379 * properly initialize the tailq, however, so we no longer allow 380 * this unlikely case. 381 */ 382 TAILQ_INIT(&ifp->if_addrhead); 383 TAILQ_INIT(&ifp->if_prefixhead); 384 TAILQ_INIT(&ifp->if_multiaddrs); 385 SLIST_INIT(&ifp->if_klist); 386 getmicrotime(&ifp->if_lastchange); 387 388 #ifdef MAC 389 mac_init_ifnet(ifp); 390 mac_create_ifnet(ifp); 391 #endif 392 393 ifp->if_index = if_findindex(ifp); 394 if (ifp->if_index > if_index) 395 if_index = ifp->if_index; 396 if (if_index >= if_indexlim) 397 if_grow(); 398 399 ifnet_byindex(ifp->if_index) = ifp; 400 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, ifp->if_index, 401 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 402 net_cdevsw.d_name, ifp->if_xname); 403 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 404 net_cdevsw.d_name, ifp->if_index); 405 406 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 407 408 /* 409 * create a Link Level name for this device 410 */ 411 namelen = strlen(ifp->if_xname); 412 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m)) 413 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen; 414 socksize = masklen + ifp->if_addrlen; 415 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1))) 416 if (socksize < sizeof(*sdl)) 417 socksize = sizeof(*sdl); 418 socksize = ROUNDUP(socksize); 419 ifasize = sizeof(*ifa) + 2 * socksize; 420 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 421 if (ifa) { 422 IFA_LOCK_INIT(ifa); 423 sdl = (struct sockaddr_dl *)(ifa + 1); 424 sdl->sdl_len = socksize; 425 sdl->sdl_family = AF_LINK; 426 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 427 sdl->sdl_nlen = namelen; 428 sdl->sdl_index = ifp->if_index; 429 sdl->sdl_type = ifp->if_type; 430 ifaddr_byindex(ifp->if_index) = ifa; 431 ifa->ifa_ifp = ifp; 432 ifa->ifa_rtrequest = link_rtrequest; 433 ifa->ifa_addr = (struct sockaddr *)sdl; 434 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 435 ifa->ifa_netmask = (struct sockaddr *)sdl; 436 sdl->sdl_len = masklen; 437 while (namelen != 0) 438 sdl->sdl_data[--namelen] = 0xff; 439 ifa->ifa_refcnt = 1; 440 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 441 } 442 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 443 444 if (domains) 445 if_attachdomain1(ifp); 446 447 /* Announce the interface. */ 448 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 449 } 450 451 static void 452 if_attachdomain(void *dummy) 453 { 454 struct ifnet *ifp; 455 int s; 456 457 s = splnet(); 458 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 459 if_attachdomain1(ifp); 460 splx(s); 461 } 462 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 463 if_attachdomain, NULL); 464 465 static void 466 if_attachdomain1(struct ifnet *ifp) 467 { 468 struct domain *dp; 469 int s; 470 471 s = splnet(); 472 473 /* 474 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 475 * cannot lock ifp->if_afdata initialization, entirely. 476 */ 477 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 478 splx(s); 479 return; 480 } 481 if (ifp->if_afdata_initialized) { 482 IF_AFDATA_UNLOCK(ifp); 483 splx(s); 484 return; 485 } 486 ifp->if_afdata_initialized = 1; 487 IF_AFDATA_UNLOCK(ifp); 488 489 /* address family dependent data region */ 490 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 491 for (dp = domains; dp; dp = dp->dom_next) { 492 if (dp->dom_ifattach) 493 ifp->if_afdata[dp->dom_family] = 494 (*dp->dom_ifattach)(ifp); 495 } 496 497 splx(s); 498 } 499 500 /* 501 * Detach an interface, removing it from the 502 * list of "active" interfaces. 503 */ 504 void 505 if_detach(struct ifnet *ifp) 506 { 507 struct ifaddr *ifa, *next; 508 struct radix_node_head *rnh; 509 int s; 510 int i; 511 struct domain *dp; 512 513 /* 514 * Remove routes and flush queues. 515 */ 516 s = splnet(); 517 if_down(ifp); 518 519 /* 520 * Remove address from ifindex_table[] and maybe decrement if_index. 521 * Clean up all addresses. 522 */ 523 ifaddr_byindex(ifp->if_index) = NULL; 524 destroy_dev(ifdev_byindex(ifp->if_index)); 525 ifdev_byindex(ifp->if_index) = NULL; 526 527 while (if_index > 0 && ifaddr_byindex(if_index) == NULL) 528 if_index--; 529 530 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; ifa = next) { 531 next = TAILQ_NEXT(ifa, ifa_link); 532 533 if (ifa->ifa_addr->sa_family == AF_LINK) 534 continue; 535 #ifdef INET 536 /* XXX: Ugly!! ad hoc just for INET */ 537 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 538 struct ifaliasreq ifr; 539 540 bzero(&ifr, sizeof(ifr)); 541 ifr.ifra_addr = *ifa->ifa_addr; 542 if (ifa->ifa_dstaddr) 543 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 544 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 545 NULL) == 0) 546 continue; 547 } 548 #endif /* INET */ 549 #ifdef INET6 550 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 551 in6_purgeaddr(ifa); 552 /* ifp_addrhead is already updated */ 553 continue; 554 } 555 #endif /* INET6 */ 556 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 557 IFAFREE(ifa); 558 } 559 560 #ifdef INET6 561 /* 562 * Remove all IPv6 kernel structs related to ifp. This should be done 563 * before removing routing entries below, since IPv6 interface direct 564 * routes are expected to be removed by the IPv6-specific kernel API. 565 * Otherwise, the kernel will detect some inconsistency and bark it. 566 */ 567 in6_ifdetach(ifp); 568 #endif 569 570 /* We can now free link ifaddr. */ 571 ifa = TAILQ_FIRST(&ifp->if_addrhead); 572 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 573 IFAFREE(ifa); 574 575 /* 576 * Delete all remaining routes using this interface 577 * Unfortuneatly the only way to do this is to slog through 578 * the entire routing table looking for routes which point 579 * to this interface...oh well... 580 */ 581 for (i = 1; i <= AF_MAX; i++) { 582 if ((rnh = rt_tables[i]) == NULL) 583 continue; 584 RADIX_NODE_HEAD_LOCK(rnh); 585 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 586 RADIX_NODE_HEAD_UNLOCK(rnh); 587 } 588 589 /* Announce that the interface is gone. */ 590 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 591 592 IF_AFDATA_LOCK(ifp); 593 for (dp = domains; dp; dp = dp->dom_next) { 594 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 595 (*dp->dom_ifdetach)(ifp, 596 ifp->if_afdata[dp->dom_family]); 597 } 598 IF_AFDATA_UNLOCK(ifp); 599 600 #ifdef MAC 601 mac_destroy_ifnet(ifp); 602 #endif /* MAC */ 603 KNOTE(&ifp->if_klist, NOTE_EXIT); 604 IFNET_WLOCK(); 605 TAILQ_REMOVE(&ifnet, ifp, if_link); 606 IFNET_WUNLOCK(); 607 mtx_destroy(&ifp->if_snd.ifq_mtx); 608 IF_AFDATA_DESTROY(ifp); 609 splx(s); 610 } 611 612 /* 613 * Delete Routes for a Network Interface 614 * 615 * Called for each routing entry via the rnh->rnh_walktree() call above 616 * to delete all route entries referencing a detaching network interface. 617 * 618 * Arguments: 619 * rn pointer to node in the routing table 620 * arg argument passed to rnh->rnh_walktree() - detaching interface 621 * 622 * Returns: 623 * 0 successful 624 * errno failed - reason indicated 625 * 626 */ 627 static int 628 if_rtdel(struct radix_node *rn, void *arg) 629 { 630 struct rtentry *rt = (struct rtentry *)rn; 631 struct ifnet *ifp = arg; 632 int err; 633 634 if (rt->rt_ifp == ifp) { 635 636 /* 637 * Protect (sorta) against walktree recursion problems 638 * with cloned routes 639 */ 640 if ((rt->rt_flags & RTF_UP) == 0) 641 return (0); 642 643 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 644 rt_mask(rt), rt->rt_flags, 645 (struct rtentry **) NULL); 646 if (err) { 647 log(LOG_WARNING, "if_rtdel: error %d\n", err); 648 } 649 } 650 651 return (0); 652 } 653 654 /* 655 * Create a clone network interface. 656 */ 657 int 658 if_clone_create(char *name, int len) 659 { 660 struct if_clone *ifc; 661 char *dp; 662 int wildcard, bytoff, bitoff; 663 int unit; 664 int err; 665 666 ifc = if_clone_lookup(name, &unit); 667 if (ifc == NULL) 668 return (EINVAL); 669 670 if (ifunit(name) != NULL) 671 return (EEXIST); 672 673 bytoff = bitoff = 0; 674 wildcard = (unit < 0); 675 /* 676 * Find a free unit if none was given. 677 */ 678 if (wildcard) { 679 while ((bytoff < ifc->ifc_bmlen) 680 && (ifc->ifc_units[bytoff] == 0xff)) 681 bytoff++; 682 if (bytoff >= ifc->ifc_bmlen) 683 return (ENOSPC); 684 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) 685 bitoff++; 686 unit = (bytoff << 3) + bitoff; 687 } 688 689 if (unit > ifc->ifc_maxunit) 690 return (ENXIO); 691 692 err = (*ifc->ifc_create)(ifc, unit); 693 if (err != 0) 694 return (err); 695 696 if (!wildcard) { 697 bytoff = unit >> 3; 698 bitoff = unit - (bytoff << 3); 699 } 700 701 /* 702 * Allocate the unit in the bitmap. 703 */ 704 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0, 705 ("%s: bit is already set", __func__)); 706 ifc->ifc_units[bytoff] |= (1 << bitoff); 707 708 /* In the wildcard case, we need to update the name. */ 709 if (wildcard) { 710 for (dp = name; *dp != '\0'; dp++); 711 if (snprintf(dp, len - (dp-name), "%d", unit) > 712 len - (dp-name) - 1) { 713 /* 714 * This can only be a programmer error and 715 * there's no straightforward way to recover if 716 * it happens. 717 */ 718 panic("if_clone_create(): interface name too long"); 719 } 720 721 } 722 723 return (0); 724 } 725 726 /* 727 * Destroy a clone network interface. 728 */ 729 int 730 if_clone_destroy(const char *name) 731 { 732 struct if_clone *ifc; 733 struct ifnet *ifp; 734 int bytoff, bitoff; 735 int unit; 736 737 ifc = if_clone_lookup(name, &unit); 738 if (ifc == NULL) 739 return (EINVAL); 740 741 if (unit < ifc->ifc_minifs) 742 return (EINVAL); 743 744 ifp = ifunit(name); 745 if (ifp == NULL) 746 return (ENXIO); 747 748 if (ifc->ifc_destroy == NULL) 749 return (EOPNOTSUPP); 750 751 (*ifc->ifc_destroy)(ifp); 752 753 /* 754 * Compute offset in the bitmap and deallocate the unit. 755 */ 756 bytoff = unit >> 3; 757 bitoff = unit - (bytoff << 3); 758 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0, 759 ("%s: bit is already cleared", __func__)); 760 ifc->ifc_units[bytoff] &= ~(1 << bitoff); 761 return (0); 762 } 763 764 /* 765 * Look up a network interface cloner. 766 */ 767 static struct if_clone * 768 if_clone_lookup(const char *name, int *unitp) 769 { 770 struct if_clone *ifc; 771 const char *cp; 772 int i; 773 774 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) { 775 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) { 776 if (ifc->ifc_name[i] != *cp) 777 goto next_ifc; 778 } 779 goto found_name; 780 next_ifc: 781 ifc = LIST_NEXT(ifc, ifc_list); 782 } 783 784 /* No match. */ 785 return ((struct if_clone *)NULL); 786 787 found_name: 788 if (*cp == '\0') { 789 i = -1; 790 } else { 791 for (i = 0; *cp != '\0'; cp++) { 792 if (*cp < '' || *cp > '9') { 793 /* Bogus unit number. */ 794 return (NULL); 795 } 796 i = (i * 10) + (*cp - ''); 797 } 798 } 799 800 if (unitp != NULL) 801 *unitp = i; 802 return (ifc); 803 } 804 805 /* 806 * Register a network interface cloner. 807 */ 808 void 809 if_clone_attach(struct if_clone *ifc) 810 { 811 int bytoff, bitoff; 812 int err; 813 int len, maxclone; 814 int unit; 815 816 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit, 817 ("%s: %s requested more units then allowed (%d > %d)", 818 __func__, ifc->ifc_name, ifc->ifc_minifs, 819 ifc->ifc_maxunit + 1)); 820 /* 821 * Compute bitmap size and allocate it. 822 */ 823 maxclone = ifc->ifc_maxunit + 1; 824 len = maxclone >> 3; 825 if ((len << 3) < maxclone) 826 len++; 827 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO); 828 ifc->ifc_bmlen = len; 829 830 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 831 if_cloners_count++; 832 833 for (unit = 0; unit < ifc->ifc_minifs; unit++) { 834 err = (*ifc->ifc_create)(ifc, unit); 835 KASSERT(err == 0, 836 ("%s: failed to create required interface %s%d", 837 __func__, ifc->ifc_name, unit)); 838 839 /* Allocate the unit in the bitmap. */ 840 bytoff = unit >> 3; 841 bitoff = unit - (bytoff << 3); 842 ifc->ifc_units[bytoff] |= (1 << bitoff); 843 } 844 } 845 846 /* 847 * Unregister a network interface cloner. 848 */ 849 void 850 if_clone_detach(struct if_clone *ifc) 851 { 852 853 LIST_REMOVE(ifc, ifc_list); 854 free(ifc->ifc_units, M_CLONE); 855 if_cloners_count--; 856 } 857 858 /* 859 * Provide list of interface cloners to userspace. 860 */ 861 static int 862 if_clone_list(struct if_clonereq *ifcr) 863 { 864 char outbuf[IFNAMSIZ], *dst; 865 struct if_clone *ifc; 866 int count, error = 0; 867 868 ifcr->ifcr_total = if_cloners_count; 869 if ((dst = ifcr->ifcr_buffer) == NULL) { 870 /* Just asking how many there are. */ 871 return (0); 872 } 873 874 if (ifcr->ifcr_count < 0) 875 return (EINVAL); 876 877 count = (if_cloners_count < ifcr->ifcr_count) ? 878 if_cloners_count : ifcr->ifcr_count; 879 880 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 881 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 882 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ); 883 error = copyout(outbuf, dst, IFNAMSIZ); 884 if (error) 885 break; 886 } 887 888 return (error); 889 } 890 891 #define equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 892 893 /* 894 * Locate an interface based on a complete address. 895 */ 896 /*ARGSUSED*/ 897 struct ifaddr * 898 ifa_ifwithaddr(struct sockaddr *addr) 899 { 900 struct ifnet *ifp; 901 struct ifaddr *ifa; 902 903 IFNET_RLOCK(); 904 TAILQ_FOREACH(ifp, &ifnet, if_link) 905 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 906 if (ifa->ifa_addr->sa_family != addr->sa_family) 907 continue; 908 if (equal(addr, ifa->ifa_addr)) 909 goto done; 910 /* IP6 doesn't have broadcast */ 911 if ((ifp->if_flags & IFF_BROADCAST) && 912 ifa->ifa_broadaddr && 913 ifa->ifa_broadaddr->sa_len != 0 && 914 equal(ifa->ifa_broadaddr, addr)) 915 goto done; 916 } 917 ifa = NULL; 918 done: 919 IFNET_RUNLOCK(); 920 return (ifa); 921 } 922 923 /* 924 * Locate the point to point interface with a given destination address. 925 */ 926 /*ARGSUSED*/ 927 struct ifaddr * 928 ifa_ifwithdstaddr(struct sockaddr *addr) 929 { 930 struct ifnet *ifp; 931 struct ifaddr *ifa; 932 933 IFNET_RLOCK(); 934 TAILQ_FOREACH(ifp, &ifnet, if_link) { 935 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 936 continue; 937 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 938 if (ifa->ifa_addr->sa_family != addr->sa_family) 939 continue; 940 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 941 goto done; 942 } 943 } 944 ifa = NULL; 945 done: 946 IFNET_RUNLOCK(); 947 return (ifa); 948 } 949 950 /* 951 * Find an interface on a specific network. If many, choice 952 * is most specific found. 953 */ 954 struct ifaddr * 955 ifa_ifwithnet(struct sockaddr *addr) 956 { 957 struct ifnet *ifp; 958 struct ifaddr *ifa; 959 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 960 u_int af = addr->sa_family; 961 char *addr_data = addr->sa_data, *cplim; 962 963 /* 964 * AF_LINK addresses can be looked up directly by their index number, 965 * so do that if we can. 966 */ 967 if (af == AF_LINK) { 968 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 969 if (sdl->sdl_index && sdl->sdl_index <= if_index) 970 return (ifaddr_byindex(sdl->sdl_index)); 971 } 972 973 /* 974 * Scan though each interface, looking for ones that have 975 * addresses in this address family. 976 */ 977 IFNET_RLOCK(); 978 TAILQ_FOREACH(ifp, &ifnet, if_link) { 979 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 980 char *cp, *cp2, *cp3; 981 982 if (ifa->ifa_addr->sa_family != af) 983 next: continue; 984 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 985 /* 986 * This is a bit broken as it doesn't 987 * take into account that the remote end may 988 * be a single node in the network we are 989 * looking for. 990 * The trouble is that we don't know the 991 * netmask for the remote end. 992 */ 993 if (ifa->ifa_dstaddr != 0 994 && equal(addr, ifa->ifa_dstaddr)) 995 goto done; 996 } else { 997 /* 998 * if we have a special address handler, 999 * then use it instead of the generic one. 1000 */ 1001 if (ifa->ifa_claim_addr) { 1002 if ((*ifa->ifa_claim_addr)(ifa, addr)) 1003 goto done; 1004 continue; 1005 } 1006 1007 /* 1008 * Scan all the bits in the ifa's address. 1009 * If a bit dissagrees with what we are 1010 * looking for, mask it with the netmask 1011 * to see if it really matters. 1012 * (A byte at a time) 1013 */ 1014 if (ifa->ifa_netmask == 0) 1015 continue; 1016 cp = addr_data; 1017 cp2 = ifa->ifa_addr->sa_data; 1018 cp3 = ifa->ifa_netmask->sa_data; 1019 cplim = ifa->ifa_netmask->sa_len 1020 + (char *)ifa->ifa_netmask; 1021 while (cp3 < cplim) 1022 if ((*cp++ ^ *cp2++) & *cp3++) 1023 goto next; /* next address! */ 1024 /* 1025 * If the netmask of what we just found 1026 * is more specific than what we had before 1027 * (if we had one) then remember the new one 1028 * before continuing to search 1029 * for an even better one. 1030 */ 1031 if (ifa_maybe == 0 || 1032 rn_refines((caddr_t)ifa->ifa_netmask, 1033 (caddr_t)ifa_maybe->ifa_netmask)) 1034 ifa_maybe = ifa; 1035 } 1036 } 1037 } 1038 ifa = ifa_maybe; 1039 done: 1040 IFNET_RUNLOCK(); 1041 return (ifa); 1042 } 1043 1044 /* 1045 * Find an interface address specific to an interface best matching 1046 * a given address. 1047 */ 1048 struct ifaddr * 1049 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1050 { 1051 struct ifaddr *ifa; 1052 char *cp, *cp2, *cp3; 1053 char *cplim; 1054 struct ifaddr *ifa_maybe = 0; 1055 u_int af = addr->sa_family; 1056 1057 if (af >= AF_MAX) 1058 return (0); 1059 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1060 if (ifa->ifa_addr->sa_family != af) 1061 continue; 1062 if (ifa_maybe == 0) 1063 ifa_maybe = ifa; 1064 if (ifa->ifa_netmask == 0) { 1065 if (equal(addr, ifa->ifa_addr) || 1066 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 1067 goto done; 1068 continue; 1069 } 1070 if (ifp->if_flags & IFF_POINTOPOINT) { 1071 if (equal(addr, ifa->ifa_dstaddr)) 1072 goto done; 1073 } else { 1074 cp = addr->sa_data; 1075 cp2 = ifa->ifa_addr->sa_data; 1076 cp3 = ifa->ifa_netmask->sa_data; 1077 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1078 for (; cp3 < cplim; cp3++) 1079 if ((*cp++ ^ *cp2++) & *cp3) 1080 break; 1081 if (cp3 == cplim) 1082 goto done; 1083 } 1084 } 1085 ifa = ifa_maybe; 1086 done: 1087 return (ifa); 1088 } 1089 1090 #include <net/route.h> 1091 1092 /* 1093 * Default action when installing a route with a Link Level gateway. 1094 * Lookup an appropriate real ifa to point to. 1095 * This should be moved to /sys/net/link.c eventually. 1096 */ 1097 static void 1098 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1099 { 1100 struct ifaddr *ifa, *oifa; 1101 struct sockaddr *dst; 1102 struct ifnet *ifp; 1103 1104 RT_LOCK_ASSERT(rt); 1105 1106 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1107 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1108 return; 1109 ifa = ifaof_ifpforaddr(dst, ifp); 1110 if (ifa) { 1111 IFAREF(ifa); /* XXX */ 1112 oifa = rt->rt_ifa; 1113 rt->rt_ifa = ifa; 1114 IFAFREE(oifa); 1115 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1116 ifa->ifa_rtrequest(cmd, rt, info); 1117 } 1118 } 1119 1120 /* 1121 * Mark an interface down and notify protocols of 1122 * the transition. 1123 * NOTE: must be called at splnet or eqivalent. 1124 */ 1125 void 1126 if_unroute(struct ifnet *ifp, int flag, int fam) 1127 { 1128 struct ifaddr *ifa; 1129 1130 ifp->if_flags &= ~flag; 1131 getmicrotime(&ifp->if_lastchange); 1132 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1133 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1134 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1135 if_qflush(&ifp->if_snd); 1136 rt_ifmsg(ifp); 1137 } 1138 1139 /* 1140 * Mark an interface up and notify protocols of 1141 * the transition. 1142 * NOTE: must be called at splnet or eqivalent. 1143 */ 1144 void 1145 if_route(struct ifnet *ifp, int flag, int fam) 1146 { 1147 struct ifaddr *ifa; 1148 1149 ifp->if_flags |= flag; 1150 getmicrotime(&ifp->if_lastchange); 1151 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1152 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1153 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1154 rt_ifmsg(ifp); 1155 #ifdef INET6 1156 in6_if_up(ifp); 1157 #endif 1158 } 1159 1160 /* 1161 * Mark an interface down and notify protocols of 1162 * the transition. 1163 * NOTE: must be called at splnet or eqivalent. 1164 */ 1165 void 1166 if_down(struct ifnet *ifp) 1167 { 1168 1169 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1170 } 1171 1172 /* 1173 * Mark an interface up and notify protocols of 1174 * the transition. 1175 * NOTE: must be called at splnet or eqivalent. 1176 */ 1177 void 1178 if_up(struct ifnet *ifp) 1179 { 1180 1181 if_route(ifp, IFF_UP, AF_UNSPEC); 1182 } 1183 1184 /* 1185 * Flush an interface queue. 1186 */ 1187 static void 1188 if_qflush(struct ifqueue *ifq) 1189 { 1190 struct mbuf *m, *n; 1191 1192 n = ifq->ifq_head; 1193 while ((m = n) != 0) { 1194 n = m->m_act; 1195 m_freem(m); 1196 } 1197 ifq->ifq_head = 0; 1198 ifq->ifq_tail = 0; 1199 ifq->ifq_len = 0; 1200 } 1201 1202 /* 1203 * Handle interface watchdog timer routines. Called 1204 * from softclock, we decrement timers (if set) and 1205 * call the appropriate interface routine on expiration. 1206 */ 1207 static void 1208 if_slowtimo(void *arg) 1209 { 1210 struct ifnet *ifp; 1211 int s = splimp(); 1212 1213 IFNET_RLOCK(); 1214 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1215 if (ifp->if_timer == 0 || --ifp->if_timer) 1216 continue; 1217 if (ifp->if_watchdog) 1218 (*ifp->if_watchdog)(ifp); 1219 } 1220 IFNET_RUNLOCK(); 1221 splx(s); 1222 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1223 } 1224 1225 /* 1226 * Map interface name to 1227 * interface structure pointer. 1228 */ 1229 struct ifnet * 1230 ifunit(const char *name) 1231 { 1232 char namebuf[IFNAMSIZ + 1]; 1233 struct ifnet *ifp; 1234 dev_t dev; 1235 1236 /* 1237 * Now search all the interfaces for this name/number 1238 */ 1239 1240 /* 1241 * XXX 1242 * Devices should really be known as /dev/fooN, not /dev/net/fooN. 1243 */ 1244 snprintf(namebuf, IFNAMSIZ, "%s/%s", net_cdevsw.d_name, name); 1245 IFNET_RLOCK(); 1246 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1247 dev = ifdev_byindex(ifp->if_index); 1248 if (strcmp(devtoname(dev), namebuf) == 0) 1249 break; 1250 if (dev_named(dev, name)) 1251 break; 1252 } 1253 IFNET_RUNLOCK(); 1254 return (ifp); 1255 } 1256 1257 /* 1258 * Map interface name in a sockaddr_dl to 1259 * interface structure pointer. 1260 */ 1261 struct ifnet * 1262 if_withname(struct sockaddr *sa) 1263 { 1264 char ifname[IFNAMSIZ+1]; 1265 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 1266 1267 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 1268 (sdl->sdl_nlen > IFNAMSIZ) ) 1269 return NULL; 1270 1271 /* 1272 * ifunit wants a NUL-terminated string. It may not be NUL-terminated 1273 * in the sockaddr, and we don't want to change the caller's sockaddr 1274 * (there might not be room to add the trailing NUL anyway), so we make 1275 * a local copy that we know we can NUL-terminate safely. 1276 */ 1277 1278 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 1279 ifname[sdl->sdl_nlen] = '\0'; 1280 return ifunit(ifname); 1281 } 1282 1283 /* 1284 * Hardware specific interface ioctls. 1285 */ 1286 static int 1287 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1288 { 1289 struct ifreq *ifr; 1290 struct ifstat *ifs; 1291 int error = 0; 1292 int new_flags; 1293 1294 ifr = (struct ifreq *)data; 1295 switch (cmd) { 1296 case SIOCGIFINDEX: 1297 ifr->ifr_index = ifp->if_index; 1298 break; 1299 1300 case SIOCGIFFLAGS: 1301 ifr->ifr_flags = ifp->if_flags & 0xffff; 1302 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1303 break; 1304 1305 case SIOCGIFCAP: 1306 ifr->ifr_reqcap = ifp->if_capabilities; 1307 ifr->ifr_curcap = ifp->if_capenable; 1308 break; 1309 1310 #ifdef MAC 1311 case SIOCGIFMAC: 1312 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1313 break; 1314 #endif 1315 1316 case SIOCGIFMETRIC: 1317 ifr->ifr_metric = ifp->if_metric; 1318 break; 1319 1320 case SIOCGIFMTU: 1321 ifr->ifr_mtu = ifp->if_mtu; 1322 break; 1323 1324 case SIOCGIFPHYS: 1325 ifr->ifr_phys = ifp->if_physical; 1326 break; 1327 1328 case SIOCSIFFLAGS: 1329 error = suser(td); 1330 if (error) 1331 return (error); 1332 new_flags = (ifr->ifr_flags & 0xffff) | 1333 (ifr->ifr_flagshigh << 16); 1334 if (ifp->if_flags & IFF_SMART) { 1335 /* Smart drivers twiddle their own routes */ 1336 } else if (ifp->if_flags & IFF_UP && 1337 (new_flags & IFF_UP) == 0) { 1338 int s = splimp(); 1339 if_down(ifp); 1340 splx(s); 1341 } else if (new_flags & IFF_UP && 1342 (ifp->if_flags & IFF_UP) == 0) { 1343 int s = splimp(); 1344 if_up(ifp); 1345 splx(s); 1346 } 1347 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1348 (new_flags &~ IFF_CANTCHANGE); 1349 if (new_flags & IFF_PPROMISC) { 1350 /* Permanently promiscuous mode requested */ 1351 ifp->if_flags |= IFF_PROMISC; 1352 } else if (ifp->if_pcount == 0) { 1353 ifp->if_flags &= ~IFF_PROMISC; 1354 } 1355 if (ifp->if_ioctl) 1356 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1357 getmicrotime(&ifp->if_lastchange); 1358 break; 1359 1360 case SIOCSIFCAP: 1361 error = suser(td); 1362 if (error) 1363 return (error); 1364 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1365 return (EINVAL); 1366 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1367 break; 1368 1369 #ifdef MAC 1370 case SIOCSIFMAC: 1371 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1372 break; 1373 #endif 1374 1375 case SIOCSIFMETRIC: 1376 error = suser(td); 1377 if (error) 1378 return (error); 1379 ifp->if_metric = ifr->ifr_metric; 1380 getmicrotime(&ifp->if_lastchange); 1381 break; 1382 1383 case SIOCSIFPHYS: 1384 error = suser(td); 1385 if (error) 1386 return error; 1387 if (!ifp->if_ioctl) 1388 return EOPNOTSUPP; 1389 error = (*ifp->if_ioctl)(ifp, cmd, data); 1390 if (error == 0) 1391 getmicrotime(&ifp->if_lastchange); 1392 return(error); 1393 1394 case SIOCSIFMTU: 1395 { 1396 u_long oldmtu = ifp->if_mtu; 1397 1398 error = suser(td); 1399 if (error) 1400 return (error); 1401 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1402 return (EINVAL); 1403 if (ifp->if_ioctl == NULL) 1404 return (EOPNOTSUPP); 1405 error = (*ifp->if_ioctl)(ifp, cmd, data); 1406 if (error == 0) { 1407 getmicrotime(&ifp->if_lastchange); 1408 rt_ifmsg(ifp); 1409 } 1410 /* 1411 * If the link MTU changed, do network layer specific procedure. 1412 */ 1413 if (ifp->if_mtu != oldmtu) { 1414 #ifdef INET6 1415 nd6_setmtu(ifp); 1416 #endif 1417 } 1418 break; 1419 } 1420 1421 case SIOCADDMULTI: 1422 case SIOCDELMULTI: 1423 error = suser(td); 1424 if (error) 1425 return (error); 1426 1427 /* Don't allow group membership on non-multicast interfaces. */ 1428 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1429 return (EOPNOTSUPP); 1430 1431 /* Don't let users screw up protocols' entries. */ 1432 if (ifr->ifr_addr.sa_family != AF_LINK) 1433 return (EINVAL); 1434 1435 if (cmd == SIOCADDMULTI) { 1436 struct ifmultiaddr *ifma; 1437 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1438 } else { 1439 error = if_delmulti(ifp, &ifr->ifr_addr); 1440 } 1441 if (error == 0) 1442 getmicrotime(&ifp->if_lastchange); 1443 break; 1444 1445 case SIOCSIFPHYADDR: 1446 case SIOCDIFPHYADDR: 1447 #ifdef INET6 1448 case SIOCSIFPHYADDR_IN6: 1449 #endif 1450 case SIOCSLIFPHYADDR: 1451 case SIOCSIFMEDIA: 1452 case SIOCSIFGENERIC: 1453 error = suser(td); 1454 if (error) 1455 return (error); 1456 if (ifp->if_ioctl == NULL) 1457 return (EOPNOTSUPP); 1458 error = (*ifp->if_ioctl)(ifp, cmd, data); 1459 if (error == 0) 1460 getmicrotime(&ifp->if_lastchange); 1461 break; 1462 1463 case SIOCGIFSTATUS: 1464 ifs = (struct ifstat *)data; 1465 ifs->ascii[0] = '\0'; 1466 1467 case SIOCGIFPSRCADDR: 1468 case SIOCGIFPDSTADDR: 1469 case SIOCGLIFPHYADDR: 1470 case SIOCGIFMEDIA: 1471 case SIOCGIFGENERIC: 1472 if (ifp->if_ioctl == 0) 1473 return (EOPNOTSUPP); 1474 error = (*ifp->if_ioctl)(ifp, cmd, data); 1475 break; 1476 1477 case SIOCSIFLLADDR: 1478 error = suser(td); 1479 if (error) 1480 return (error); 1481 error = if_setlladdr(ifp, 1482 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1483 break; 1484 1485 default: 1486 error = ENOIOCTL; 1487 break; 1488 } 1489 return (error); 1490 } 1491 1492 /* 1493 * Interface ioctls. 1494 */ 1495 int 1496 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1497 { 1498 struct ifnet *ifp; 1499 struct ifreq *ifr; 1500 int error; 1501 int oif_flags; 1502 1503 switch (cmd) { 1504 case SIOCGIFCONF: 1505 case OSIOCGIFCONF: 1506 return (ifconf(cmd, data)); 1507 } 1508 ifr = (struct ifreq *)data; 1509 1510 switch (cmd) { 1511 case SIOCIFCREATE: 1512 case SIOCIFDESTROY: 1513 if ((error = suser(td)) != 0) 1514 return (error); 1515 return ((cmd == SIOCIFCREATE) ? 1516 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1517 if_clone_destroy(ifr->ifr_name)); 1518 1519 case SIOCIFGCLONERS: 1520 return (if_clone_list((struct if_clonereq *)data)); 1521 } 1522 1523 ifp = ifunit(ifr->ifr_name); 1524 if (ifp == 0) 1525 return (ENXIO); 1526 1527 error = ifhwioctl(cmd, ifp, data, td); 1528 if (error != ENOIOCTL) 1529 return (error); 1530 1531 oif_flags = ifp->if_flags; 1532 if (so->so_proto == 0) 1533 return (EOPNOTSUPP); 1534 #ifndef COMPAT_43 1535 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1536 data, 1537 ifp, td)); 1538 #else 1539 { 1540 int ocmd = cmd; 1541 1542 switch (cmd) { 1543 1544 case SIOCSIFDSTADDR: 1545 case SIOCSIFADDR: 1546 case SIOCSIFBRDADDR: 1547 case SIOCSIFNETMASK: 1548 #if BYTE_ORDER != BIG_ENDIAN 1549 if (ifr->ifr_addr.sa_family == 0 && 1550 ifr->ifr_addr.sa_len < 16) { 1551 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1552 ifr->ifr_addr.sa_len = 16; 1553 } 1554 #else 1555 if (ifr->ifr_addr.sa_len == 0) 1556 ifr->ifr_addr.sa_len = 16; 1557 #endif 1558 break; 1559 1560 case OSIOCGIFADDR: 1561 cmd = SIOCGIFADDR; 1562 break; 1563 1564 case OSIOCGIFDSTADDR: 1565 cmd = SIOCGIFDSTADDR; 1566 break; 1567 1568 case OSIOCGIFBRDADDR: 1569 cmd = SIOCGIFBRDADDR; 1570 break; 1571 1572 case OSIOCGIFNETMASK: 1573 cmd = SIOCGIFNETMASK; 1574 } 1575 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1576 cmd, 1577 data, 1578 ifp, td)); 1579 switch (ocmd) { 1580 1581 case OSIOCGIFADDR: 1582 case OSIOCGIFDSTADDR: 1583 case OSIOCGIFBRDADDR: 1584 case OSIOCGIFNETMASK: 1585 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1586 1587 } 1588 } 1589 #endif /* COMPAT_43 */ 1590 1591 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1592 #ifdef INET6 1593 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1594 if (ifp->if_flags & IFF_UP) { 1595 int s = splimp(); 1596 in6_if_up(ifp); 1597 splx(s); 1598 } 1599 #endif 1600 } 1601 return (error); 1602 } 1603 1604 /* 1605 * Set/clear promiscuous mode on interface ifp based on the truth value 1606 * of pswitch. The calls are reference counted so that only the first 1607 * "on" request actually has an effect, as does the final "off" request. 1608 * Results are undefined if the "off" and "on" requests are not matched. 1609 */ 1610 int 1611 ifpromisc(struct ifnet *ifp, int pswitch) 1612 { 1613 struct ifreq ifr; 1614 int error; 1615 int oldflags, oldpcount; 1616 1617 oldpcount = ifp->if_pcount; 1618 oldflags = ifp->if_flags; 1619 if (ifp->if_flags & IFF_PPROMISC) { 1620 /* Do nothing if device is in permanently promiscuous mode */ 1621 ifp->if_pcount += pswitch ? 1 : -1; 1622 return (0); 1623 } 1624 if (pswitch) { 1625 /* 1626 * If the device is not configured up, we cannot put it in 1627 * promiscuous mode. 1628 */ 1629 if ((ifp->if_flags & IFF_UP) == 0) 1630 return (ENETDOWN); 1631 if (ifp->if_pcount++ != 0) 1632 return (0); 1633 ifp->if_flags |= IFF_PROMISC; 1634 } else { 1635 if (--ifp->if_pcount > 0) 1636 return (0); 1637 ifp->if_flags &= ~IFF_PROMISC; 1638 } 1639 ifr.ifr_flags = ifp->if_flags & 0xffff; 1640 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1641 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1642 if (error == 0) { 1643 log(LOG_INFO, "%s: promiscuous mode %s\n", 1644 ifp->if_xname, 1645 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1646 rt_ifmsg(ifp); 1647 } else { 1648 ifp->if_pcount = oldpcount; 1649 ifp->if_flags = oldflags; 1650 } 1651 return error; 1652 } 1653 1654 /* 1655 * Return interface configuration 1656 * of system. List may be used 1657 * in later ioctl's (above) to get 1658 * other information. 1659 */ 1660 /*ARGSUSED*/ 1661 static int 1662 ifconf(u_long cmd, caddr_t data) 1663 { 1664 struct ifconf *ifc = (struct ifconf *)data; 1665 struct ifnet *ifp; 1666 struct ifaddr *ifa; 1667 struct ifreq ifr, *ifrp; 1668 int space = ifc->ifc_len, error = 0; 1669 1670 ifrp = ifc->ifc_req; 1671 IFNET_RLOCK(); /* could sleep XXX */ 1672 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1673 int addrs; 1674 1675 if (space < sizeof(ifr)) 1676 break; 1677 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1678 >= sizeof(ifr.ifr_name)) { 1679 error = ENAMETOOLONG; 1680 break; 1681 } 1682 1683 addrs = 0; 1684 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1685 struct sockaddr *sa = ifa->ifa_addr; 1686 1687 if (space < sizeof(ifr)) 1688 break; 1689 if (jailed(curthread->td_ucred) && 1690 prison_if(curthread->td_ucred, sa)) 1691 continue; 1692 addrs++; 1693 #ifdef COMPAT_43 1694 if (cmd == OSIOCGIFCONF) { 1695 struct osockaddr *osa = 1696 (struct osockaddr *)&ifr.ifr_addr; 1697 ifr.ifr_addr = *sa; 1698 osa->sa_family = sa->sa_family; 1699 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1700 sizeof (ifr)); 1701 ifrp++; 1702 } else 1703 #endif 1704 if (sa->sa_len <= sizeof(*sa)) { 1705 ifr.ifr_addr = *sa; 1706 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1707 sizeof (ifr)); 1708 ifrp++; 1709 } else { 1710 if (space < sizeof (ifr) + sa->sa_len - 1711 sizeof(*sa)) 1712 break; 1713 space -= sa->sa_len - sizeof(*sa); 1714 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1715 sizeof (ifr.ifr_name)); 1716 if (error == 0) 1717 error = copyout((caddr_t)sa, 1718 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 1719 ifrp = (struct ifreq *) 1720 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1721 } 1722 if (error) 1723 break; 1724 space -= sizeof (ifr); 1725 } 1726 if (error) 1727 break; 1728 if (!addrs) { 1729 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1730 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1731 sizeof (ifr)); 1732 if (error) 1733 break; 1734 space -= sizeof (ifr); 1735 ifrp++; 1736 } 1737 } 1738 IFNET_RUNLOCK(); 1739 ifc->ifc_len -= space; 1740 return (error); 1741 } 1742 1743 /* 1744 * Just like if_promisc(), but for all-multicast-reception mode. 1745 */ 1746 int 1747 if_allmulti(struct ifnet *ifp, int onswitch) 1748 { 1749 int error = 0; 1750 int s = splimp(); 1751 struct ifreq ifr; 1752 1753 if (onswitch) { 1754 if (ifp->if_amcount++ == 0) { 1755 ifp->if_flags |= IFF_ALLMULTI; 1756 ifr.ifr_flags = ifp->if_flags & 0xffff; 1757 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1758 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1759 } 1760 } else { 1761 if (ifp->if_amcount > 1) { 1762 ifp->if_amcount--; 1763 } else { 1764 ifp->if_amcount = 0; 1765 ifp->if_flags &= ~IFF_ALLMULTI; 1766 ifr.ifr_flags = ifp->if_flags & 0xffff;; 1767 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1768 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1769 } 1770 } 1771 splx(s); 1772 1773 if (error == 0) 1774 rt_ifmsg(ifp); 1775 return error; 1776 } 1777 1778 /* 1779 * Add a multicast listenership to the interface in question. 1780 * The link layer provides a routine which converts 1781 */ 1782 int 1783 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma) 1784 { 1785 struct sockaddr *llsa, *dupsa; 1786 int error, s; 1787 struct ifmultiaddr *ifma; 1788 1789 /* 1790 * If the matching multicast address already exists 1791 * then don't add a new one, just add a reference 1792 */ 1793 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1794 if (equal(sa, ifma->ifma_addr)) { 1795 ifma->ifma_refcount++; 1796 if (retifma) 1797 *retifma = ifma; 1798 return 0; 1799 } 1800 } 1801 1802 /* 1803 * Give the link layer a chance to accept/reject it, and also 1804 * find out which AF_LINK address this maps to, if it isn't one 1805 * already. 1806 */ 1807 if (ifp->if_resolvemulti) { 1808 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1809 if (error) return error; 1810 } else { 1811 llsa = 0; 1812 } 1813 1814 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1815 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1816 bcopy(sa, dupsa, sa->sa_len); 1817 1818 ifma->ifma_addr = dupsa; 1819 ifma->ifma_lladdr = llsa; 1820 ifma->ifma_ifp = ifp; 1821 ifma->ifma_refcount = 1; 1822 ifma->ifma_protospec = 0; 1823 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1824 1825 /* 1826 * Some network interfaces can scan the address list at 1827 * interrupt time; lock them out. 1828 */ 1829 s = splimp(); 1830 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1831 splx(s); 1832 if (retifma != NULL) 1833 *retifma = ifma; 1834 1835 if (llsa != 0) { 1836 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1837 if (equal(ifma->ifma_addr, llsa)) 1838 break; 1839 } 1840 if (ifma) { 1841 ifma->ifma_refcount++; 1842 } else { 1843 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1844 M_IFMADDR, M_WAITOK); 1845 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1846 M_IFMADDR, M_WAITOK); 1847 bcopy(llsa, dupsa, llsa->sa_len); 1848 ifma->ifma_addr = dupsa; 1849 ifma->ifma_lladdr = NULL; 1850 ifma->ifma_ifp = ifp; 1851 ifma->ifma_refcount = 1; 1852 ifma->ifma_protospec = 0; 1853 s = splimp(); 1854 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1855 splx(s); 1856 } 1857 } 1858 /* 1859 * We are certain we have added something, so call down to the 1860 * interface to let them know about it. 1861 */ 1862 s = splimp(); 1863 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1864 splx(s); 1865 1866 return 0; 1867 } 1868 1869 /* 1870 * Remove a reference to a multicast address on this interface. Yell 1871 * if the request does not match an existing membership. 1872 */ 1873 int 1874 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1875 { 1876 struct ifmultiaddr *ifma; 1877 int s; 1878 1879 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1880 if (equal(sa, ifma->ifma_addr)) 1881 break; 1882 if (ifma == 0) 1883 return ENOENT; 1884 1885 if (ifma->ifma_refcount > 1) { 1886 ifma->ifma_refcount--; 1887 return 0; 1888 } 1889 1890 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1891 sa = ifma->ifma_lladdr; 1892 s = splimp(); 1893 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1894 /* 1895 * Make sure the interface driver is notified 1896 * in the case of a link layer mcast group being left. 1897 */ 1898 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1899 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1900 splx(s); 1901 free(ifma->ifma_addr, M_IFMADDR); 1902 free(ifma, M_IFMADDR); 1903 if (sa == 0) 1904 return 0; 1905 1906 /* 1907 * Now look for the link-layer address which corresponds to 1908 * this network address. It had been squirreled away in 1909 * ifma->ifma_lladdr for this purpose (so we don't have 1910 * to call ifp->if_resolvemulti() again), and we saved that 1911 * value in sa above. If some nasty deleted the 1912 * link-layer address out from underneath us, we can deal because 1913 * the address we stored was is not the same as the one which was 1914 * in the record for the link-layer address. (So we don't complain 1915 * in that case.) 1916 */ 1917 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1918 if (equal(sa, ifma->ifma_addr)) 1919 break; 1920 if (ifma == 0) 1921 return 0; 1922 1923 if (ifma->ifma_refcount > 1) { 1924 ifma->ifma_refcount--; 1925 return 0; 1926 } 1927 1928 s = splimp(); 1929 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1930 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1931 splx(s); 1932 free(ifma->ifma_addr, M_IFMADDR); 1933 free(sa, M_IFMADDR); 1934 free(ifma, M_IFMADDR); 1935 1936 return 0; 1937 } 1938 1939 /* 1940 * Set the link layer address on an interface. 1941 * 1942 * At this time we only support certain types of interfaces, 1943 * and we don't allow the length of the address to change. 1944 */ 1945 int 1946 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1947 { 1948 struct sockaddr_dl *sdl; 1949 struct ifaddr *ifa; 1950 struct ifreq ifr; 1951 1952 ifa = ifaddr_byindex(ifp->if_index); 1953 if (ifa == NULL) 1954 return (EINVAL); 1955 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1956 if (sdl == NULL) 1957 return (EINVAL); 1958 if (len != sdl->sdl_alen) /* don't allow length to change */ 1959 return (EINVAL); 1960 switch (ifp->if_type) { 1961 case IFT_ETHER: /* these types use struct arpcom */ 1962 case IFT_FDDI: 1963 case IFT_XETHER: 1964 case IFT_ISO88025: 1965 case IFT_L2VLAN: 1966 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1967 /* FALLTHROUGH */ 1968 case IFT_ARCNET: 1969 bcopy(lladdr, LLADDR(sdl), len); 1970 break; 1971 default: 1972 return (ENODEV); 1973 } 1974 /* 1975 * If the interface is already up, we need 1976 * to re-init it in order to reprogram its 1977 * address filter. 1978 */ 1979 if ((ifp->if_flags & IFF_UP) != 0) { 1980 ifp->if_flags &= ~IFF_UP; 1981 ifr.ifr_flags = ifp->if_flags & 0xffff; 1982 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1983 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1984 ifp->if_flags |= IFF_UP; 1985 ifr.ifr_flags = ifp->if_flags & 0xffff; 1986 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1987 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1988 #ifdef INET 1989 /* 1990 * Also send gratuitous ARPs to notify other nodes about 1991 * the address change. 1992 */ 1993 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1994 if (ifa->ifa_addr != NULL && 1995 ifa->ifa_addr->sa_family == AF_INET) 1996 arp_ifinit(ifp, ifa); 1997 } 1998 #endif 1999 } 2000 return (0); 2001 } 2002 2003 struct ifmultiaddr * 2004 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 2005 { 2006 struct ifmultiaddr *ifma; 2007 2008 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 2009 if (equal(ifma->ifma_addr, sa)) 2010 break; 2011 2012 return ifma; 2013 } 2014 2015 /* 2016 * The name argument must be a pointer to storage which will last as 2017 * long as the interface does. For physical devices, the result of 2018 * device_get_name(dev) is a good choice and for pseudo-devices a 2019 * static string works well. 2020 */ 2021 void 2022 if_initname(struct ifnet *ifp, const char *name, int unit) 2023 { 2024 ifp->if_dname = name; 2025 ifp->if_dunit = unit; 2026 if (unit != IF_DUNIT_NONE) 2027 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2028 else 2029 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2030 } 2031 2032 int 2033 if_printf(struct ifnet *ifp, const char * fmt, ...) 2034 { 2035 va_list ap; 2036 int retval; 2037 2038 retval = printf("%s: ", ifp->if_xname); 2039 va_start(ap, fmt); 2040 retval += vprintf(fmt, ap); 2041 va_end(ap); 2042 return (retval); 2043 } 2044 2045 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 2046 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
Cache object: 605e89f6d0c74c15cade964e6e110693
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