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/5.0/sys/net/if.c 106957 2002-11-15 18:42:10Z sam $ 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/jail.h> 58 #include <machine/stdarg.h> 59 60 #include <net/if.h> 61 #include <net/if_arp.h> 62 #include <net/if_dl.h> 63 #include <net/if_types.h> 64 #include <net/if_var.h> 65 #include <net/radix.h> 66 #include <net/route.h> 67 68 #if defined(INET) || defined(INET6) 69 /*XXX*/ 70 #include <netinet/in.h> 71 #include <netinet/in_var.h> 72 #ifdef INET6 73 #include <netinet6/in6_var.h> 74 #include <netinet6/in6_ifattach.h> 75 #endif 76 #endif 77 #ifdef INET 78 #include <netinet/if_ether.h> 79 #endif 80 81 static int ifconf(u_long, caddr_t); 82 static void if_grow(void); 83 static void if_init(void *); 84 static void if_check(void *); 85 static int if_findindex(struct ifnet *); 86 static void if_qflush(struct ifqueue *); 87 static void if_slowtimo(void *); 88 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 89 static int if_rtdel(struct radix_node *, void *); 90 static struct if_clone *if_clone_lookup(const char *, int *); 91 static int if_clone_list(struct if_clonereq *); 92 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 93 #ifdef INET6 94 /* 95 * XXX: declare here to avoid to include many inet6 related files.. 96 * should be more generalized? 97 */ 98 extern void nd6_setmtu(struct ifnet *); 99 #endif 100 101 int if_index = 0; 102 struct ifindex_entry *ifindex_table = NULL; 103 int ifqmaxlen = IFQ_MAXLEN; 104 struct ifnethead ifnet; /* depend on static init XXX */ 105 int if_cloners_count; 106 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 107 108 static int if_indexlim = 8; 109 static struct klist ifklist; 110 111 static void filt_netdetach(struct knote *kn); 112 static int filt_netdev(struct knote *kn, long hint); 113 114 static struct filterops netdev_filtops = 115 { 1, NULL, filt_netdetach, filt_netdev }; 116 117 /* 118 * System initialization 119 */ 120 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 121 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 122 123 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 124 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 125 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework"); 126 127 #define CDEV_MAJOR 165 128 129 static d_open_t netopen; 130 static d_close_t netclose; 131 static d_ioctl_t netioctl; 132 static d_kqfilter_t netkqfilter; 133 134 static struct cdevsw net_cdevsw = { 135 /* open */ netopen, 136 /* close */ netclose, 137 /* read */ noread, 138 /* write */ nowrite, 139 /* ioctl */ netioctl, 140 /* poll */ nopoll, 141 /* mmap */ nommap, 142 /* strategy */ nostrategy, 143 /* name */ "net", 144 /* maj */ CDEV_MAJOR, 145 /* dump */ nodump, 146 /* psize */ nopsize, 147 /* flags */ D_KQFILTER, 148 /* kqfilter */ netkqfilter, 149 }; 150 151 static int 152 netopen(dev_t dev, int flag, int mode, struct thread *td) 153 { 154 return (0); 155 } 156 157 static int 158 netclose(dev_t dev, int flags, int fmt, struct thread *td) 159 { 160 return (0); 161 } 162 163 static int 164 netioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td) 165 { 166 struct ifnet *ifp; 167 int error, idx; 168 169 /* only support interface specific ioctls */ 170 if (IOCGROUP(cmd) != 'i') 171 return (EOPNOTSUPP); 172 idx = minor(dev); 173 if (idx == 0) { 174 /* 175 * special network device, not interface. 176 */ 177 if (cmd == SIOCGIFCONF) 178 return (ifconf(cmd, data)); /* XXX remove cmd */ 179 return (EOPNOTSUPP); 180 } 181 182 ifp = ifnet_byindex(idx); 183 if (ifp == NULL) 184 return (ENXIO); 185 186 error = ifhwioctl(cmd, ifp, data, td); 187 if (error == ENOIOCTL) 188 error = EOPNOTSUPP; 189 return (error); 190 } 191 192 static int 193 netkqfilter(dev_t dev, struct knote *kn) 194 { 195 struct klist *klist; 196 struct ifnet *ifp; 197 int idx; 198 199 idx = minor(dev); 200 if (idx == 0) { 201 klist = &ifklist; 202 } else { 203 ifp = ifnet_byindex(idx); 204 if (ifp == NULL) 205 return (1); 206 klist = &ifp->if_klist; 207 } 208 209 switch (kn->kn_filter) { 210 case EVFILT_NETDEV: 211 kn->kn_fop = &netdev_filtops; 212 break; 213 default: 214 return (1); 215 } 216 217 kn->kn_hook = (caddr_t)klist; 218 219 /* XXX locking? */ 220 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 221 222 return (0); 223 } 224 225 static void 226 filt_netdetach(struct knote *kn) 227 { 228 struct klist *klist = (struct klist *)kn->kn_hook; 229 230 if (kn->kn_status & KN_DETACHED) 231 return; 232 SLIST_REMOVE(klist, kn, knote, kn_selnext); 233 } 234 235 static int 236 filt_netdev(struct knote *kn, long hint) 237 { 238 239 /* 240 * Currently NOTE_EXIT is abused to indicate device detach. 241 */ 242 if (hint == NOTE_EXIT) { 243 kn->kn_data = NOTE_LINKINV; 244 kn->kn_status |= KN_DETACHED; 245 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 246 return (1); 247 } 248 kn->kn_data = hint; /* current status */ 249 if (kn->kn_sfflags & hint) 250 kn->kn_fflags |= hint; 251 return (kn->kn_fflags != 0); 252 } 253 254 /* 255 * Network interface utility routines. 256 * 257 * Routines with ifa_ifwith* names take sockaddr *'s as 258 * parameters. 259 */ 260 /* ARGSUSED*/ 261 static void 262 if_init(dummy) 263 void *dummy; 264 { 265 266 TAILQ_INIT(&ifnet); 267 SLIST_INIT(&ifklist); 268 if_grow(); /* create initial table */ 269 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 270 UID_ROOT, GID_WHEEL, 0600, "network"); 271 } 272 273 static void 274 if_grow(void) 275 { 276 u_int n; 277 struct ifindex_entry *e; 278 279 if_indexlim <<= 1; 280 n = if_indexlim * sizeof(*e); 281 e = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 282 if (ifindex_table != NULL) { 283 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 284 free((caddr_t)ifindex_table, M_IFADDR); 285 } 286 ifindex_table = e; 287 } 288 289 /* ARGSUSED*/ 290 static void 291 if_check(dummy) 292 void *dummy; 293 { 294 struct ifnet *ifp; 295 int s; 296 297 s = splimp(); 298 TAILQ_FOREACH(ifp, &ifnet, if_link) { 299 if (ifp->if_snd.ifq_maxlen == 0) { 300 printf("%s%d XXX: driver didn't set ifq_maxlen\n", 301 ifp->if_name, ifp->if_unit); 302 ifp->if_snd.ifq_maxlen = ifqmaxlen; 303 } 304 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 305 printf("%s%d XXX: driver didn't initialize queue mtx\n", 306 ifp->if_name, ifp->if_unit); 307 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 308 MTX_NETWORK_LOCK, MTX_DEF); 309 } 310 } 311 splx(s); 312 if_slowtimo(0); 313 } 314 315 static int 316 if_findindex(struct ifnet *ifp) 317 { 318 int i, unit; 319 char eaddr[18], devname[32]; 320 const char *name, *p; 321 322 switch (ifp->if_type) { 323 case IFT_ETHER: /* these types use struct arpcom */ 324 case IFT_FDDI: 325 case IFT_XETHER: 326 case IFT_ISO88025: 327 case IFT_L2VLAN: 328 snprintf(eaddr, 18, "%6D", 329 ((struct arpcom *)ifp->if_softc)->ac_enaddr, ":"); 330 break; 331 default: 332 eaddr[0] = '\0'; 333 break; 334 } 335 snprintf(devname, 32, "%s%d", ifp->if_name, ifp->if_unit); 336 name = net_cdevsw.d_name; 337 i = 0; 338 while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) { 339 if (resource_string_value(name, unit, "ether", &p) == 0) 340 if (strcmp(p, eaddr) == 0) 341 goto found; 342 if (resource_string_value(name, unit, "dev", &p) == 0) 343 if (strcmp(p, devname) == 0) 344 goto found; 345 } 346 unit = 0; 347 found: 348 if (unit != 0) { 349 if (ifaddr_byindex(unit) == NULL) 350 return (unit); 351 printf("%s%d in use, cannot hardwire it to %s.\n", 352 name, unit, devname); 353 } 354 for (unit = 1; ; unit++) { 355 if (unit <= if_index && ifaddr_byindex(unit) != NULL) 356 continue; 357 if (resource_string_value(name, unit, "ether", &p) == 0 || 358 resource_string_value(name, unit, "dev", &p) == 0) 359 continue; 360 break; 361 } 362 return (unit); 363 } 364 365 /* 366 * Attach an interface to the 367 * list of "active" interfaces. 368 */ 369 void 370 if_attach(ifp) 371 struct ifnet *ifp; 372 { 373 unsigned socksize, ifasize; 374 int namelen, masklen; 375 char workbuf[64]; 376 register struct sockaddr_dl *sdl; 377 register struct ifaddr *ifa; 378 379 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 380 /* 381 * XXX - 382 * The old code would work if the interface passed a pre-existing 383 * chain of ifaddrs to this code. We don't trust our callers to 384 * properly initialize the tailq, however, so we no longer allow 385 * this unlikely case. 386 */ 387 TAILQ_INIT(&ifp->if_addrhead); 388 TAILQ_INIT(&ifp->if_prefixhead); 389 TAILQ_INIT(&ifp->if_multiaddrs); 390 SLIST_INIT(&ifp->if_klist); 391 getmicrotime(&ifp->if_lastchange); 392 393 #ifdef MAC 394 mac_init_ifnet(ifp); 395 mac_create_ifnet(ifp); 396 #endif 397 398 ifp->if_index = if_findindex(ifp); 399 if (ifp->if_index > if_index) 400 if_index = ifp->if_index; 401 if (if_index >= if_indexlim) 402 if_grow(); 403 404 ifnet_byindex(ifp->if_index) = ifp; 405 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, ifp->if_index, 406 UID_ROOT, GID_WHEEL, 0600, "%s/%s%d", 407 net_cdevsw.d_name, ifp->if_name, ifp->if_unit); 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_name, "if send queue", MTX_DEF); 412 413 /* 414 * create a Link Level name for this device 415 */ 416 namelen = snprintf(workbuf, sizeof(workbuf), 417 "%s%d", ifp->if_name, ifp->if_unit); 418 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m)) 419 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen; 420 socksize = masklen + ifp->if_addrlen; 421 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1))) 422 if (socksize < sizeof(*sdl)) 423 socksize = sizeof(*sdl); 424 socksize = ROUNDUP(socksize); 425 ifasize = sizeof(*ifa) + 2 * socksize; 426 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 427 if (ifa) { 428 sdl = (struct sockaddr_dl *)(ifa + 1); 429 sdl->sdl_len = socksize; 430 sdl->sdl_family = AF_LINK; 431 bcopy(workbuf, sdl->sdl_data, namelen); 432 sdl->sdl_nlen = namelen; 433 sdl->sdl_index = ifp->if_index; 434 sdl->sdl_type = ifp->if_type; 435 ifaddr_byindex(ifp->if_index) = ifa; 436 ifa->ifa_ifp = ifp; 437 ifa->ifa_rtrequest = link_rtrequest; 438 ifa->ifa_addr = (struct sockaddr *)sdl; 439 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 440 ifa->ifa_netmask = (struct sockaddr *)sdl; 441 sdl->sdl_len = masklen; 442 while (namelen != 0) 443 sdl->sdl_data[--namelen] = 0xff; 444 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 445 } 446 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 447 448 /* Announce the interface. */ 449 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 450 } 451 452 /* 453 * Detach an interface, removing it from the 454 * list of "active" interfaces. 455 */ 456 void 457 if_detach(ifp) 458 struct ifnet *ifp; 459 { 460 struct ifaddr *ifa; 461 struct radix_node_head *rnh; 462 int s; 463 int i; 464 465 /* 466 * Remove routes and flush queues. 467 */ 468 s = splnet(); 469 if_down(ifp); 470 471 /* 472 * Remove address from ifindex_table[] and maybe decrement if_index. 473 * Clean up all addresses. 474 */ 475 ifaddr_byindex(ifp->if_index) = NULL; 476 revoke_and_destroy_dev(ifdev_byindex(ifp->if_index)); 477 ifdev_byindex(ifp->if_index) = NULL; 478 479 while (if_index > 0 && ifaddr_byindex(if_index) == NULL) 480 if_index--; 481 482 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 483 ifa = TAILQ_FIRST(&ifp->if_addrhead)) { 484 #ifdef INET 485 /* XXX: Ugly!! ad hoc just for INET */ 486 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 487 struct ifaliasreq ifr; 488 489 bzero(&ifr, sizeof(ifr)); 490 ifr.ifra_addr = *ifa->ifa_addr; 491 if (ifa->ifa_dstaddr) 492 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 493 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 494 NULL) == 0) 495 continue; 496 } 497 #endif /* INET */ 498 #ifdef INET6 499 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 500 in6_purgeaddr(ifa); 501 /* ifp_addrhead is already updated */ 502 continue; 503 } 504 #endif /* INET6 */ 505 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 506 IFAFREE(ifa); 507 } 508 509 #ifdef INET6 510 /* 511 * Remove all IPv6 kernel structs related to ifp. This should be done 512 * before removing routing entries below, since IPv6 interface direct 513 * routes are expected to be removed by the IPv6-specific kernel API. 514 * Otherwise, the kernel will detect some inconsistency and bark it. 515 */ 516 in6_ifdetach(ifp); 517 #endif 518 519 /* 520 * Delete all remaining routes using this interface 521 * Unfortuneatly the only way to do this is to slog through 522 * the entire routing table looking for routes which point 523 * to this interface...oh well... 524 */ 525 for (i = 1; i <= AF_MAX; i++) { 526 if ((rnh = rt_tables[i]) == NULL) 527 continue; 528 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 529 } 530 531 /* Announce that the interface is gone. */ 532 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 533 534 #ifdef MAC 535 mac_destroy_ifnet(ifp); 536 #endif /* MAC */ 537 KNOTE(&ifp->if_klist, NOTE_EXIT); 538 TAILQ_REMOVE(&ifnet, ifp, if_link); 539 mtx_destroy(&ifp->if_snd.ifq_mtx); 540 splx(s); 541 } 542 543 /* 544 * Delete Routes for a Network Interface 545 * 546 * Called for each routing entry via the rnh->rnh_walktree() call above 547 * to delete all route entries referencing a detaching network interface. 548 * 549 * Arguments: 550 * rn pointer to node in the routing table 551 * arg argument passed to rnh->rnh_walktree() - detaching interface 552 * 553 * Returns: 554 * 0 successful 555 * errno failed - reason indicated 556 * 557 */ 558 static int 559 if_rtdel(rn, arg) 560 struct radix_node *rn; 561 void *arg; 562 { 563 struct rtentry *rt = (struct rtentry *)rn; 564 struct ifnet *ifp = arg; 565 int err; 566 567 if (rt->rt_ifp == ifp) { 568 569 /* 570 * Protect (sorta) against walktree recursion problems 571 * with cloned routes 572 */ 573 if ((rt->rt_flags & RTF_UP) == 0) 574 return (0); 575 576 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 577 rt_mask(rt), rt->rt_flags, 578 (struct rtentry **) NULL); 579 if (err) { 580 log(LOG_WARNING, "if_rtdel: error %d\n", err); 581 } 582 } 583 584 return (0); 585 } 586 587 /* 588 * Create a clone network interface. 589 */ 590 int 591 if_clone_create(name, len) 592 char *name; 593 int len; 594 { 595 struct if_clone *ifc; 596 char *dp; 597 int wildcard, bytoff, bitoff; 598 int unit; 599 int err; 600 601 ifc = if_clone_lookup(name, &unit); 602 if (ifc == NULL) 603 return (EINVAL); 604 605 if (ifunit(name) != NULL) 606 return (EEXIST); 607 608 bytoff = bitoff = 0; 609 wildcard = (unit < 0); 610 /* 611 * Find a free unit if none was given. 612 */ 613 if (wildcard) { 614 while ((bytoff < ifc->ifc_bmlen) 615 && (ifc->ifc_units[bytoff] == 0xff)) 616 bytoff++; 617 if (bytoff >= ifc->ifc_bmlen) 618 return (ENOSPC); 619 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) 620 bitoff++; 621 unit = (bytoff << 3) + bitoff; 622 } 623 624 if (unit > ifc->ifc_maxunit) 625 return (ENXIO); 626 627 err = (*ifc->ifc_create)(ifc, unit); 628 if (err != 0) 629 return (err); 630 631 if (!wildcard) { 632 bytoff = unit >> 3; 633 bitoff = unit - (bytoff << 3); 634 } 635 636 /* 637 * Allocate the unit in the bitmap. 638 */ 639 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0, 640 ("%s: bit is already set", __func__)); 641 ifc->ifc_units[bytoff] |= (1 << bitoff); 642 643 /* In the wildcard case, we need to update the name. */ 644 if (wildcard) { 645 for (dp = name; *dp != '\0'; dp++); 646 if (snprintf(dp, len - (dp-name), "%d", unit) > 647 len - (dp-name) - 1) { 648 /* 649 * This can only be a programmer error and 650 * there's no straightforward way to recover if 651 * it happens. 652 */ 653 panic("if_clone_create(): interface name too long"); 654 } 655 656 } 657 658 return (0); 659 } 660 661 /* 662 * Destroy a clone network interface. 663 */ 664 int 665 if_clone_destroy(name) 666 const char *name; 667 { 668 struct if_clone *ifc; 669 struct ifnet *ifp; 670 int bytoff, bitoff; 671 int unit; 672 673 ifc = if_clone_lookup(name, &unit); 674 if (ifc == NULL) 675 return (EINVAL); 676 677 if (unit < ifc->ifc_minifs) 678 return (EINVAL); 679 680 ifp = ifunit(name); 681 if (ifp == NULL) 682 return (ENXIO); 683 684 if (ifc->ifc_destroy == NULL) 685 return (EOPNOTSUPP); 686 687 (*ifc->ifc_destroy)(ifp); 688 689 /* 690 * Compute offset in the bitmap and deallocate the unit. 691 */ 692 bytoff = unit >> 3; 693 bitoff = unit - (bytoff << 3); 694 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0, 695 ("%s: bit is already cleared", __func__)); 696 ifc->ifc_units[bytoff] &= ~(1 << bitoff); 697 return (0); 698 } 699 700 /* 701 * Look up a network interface cloner. 702 */ 703 static struct if_clone * 704 if_clone_lookup(name, unitp) 705 const char *name; 706 int *unitp; 707 { 708 struct if_clone *ifc; 709 const char *cp; 710 int i; 711 712 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) { 713 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) { 714 if (ifc->ifc_name[i] != *cp) 715 goto next_ifc; 716 } 717 goto found_name; 718 next_ifc: 719 ifc = LIST_NEXT(ifc, ifc_list); 720 } 721 722 /* No match. */ 723 return ((struct if_clone *)NULL); 724 725 found_name: 726 if (*cp == '\0') { 727 i = -1; 728 } else { 729 for (i = 0; *cp != '\0'; cp++) { 730 if (*cp < '' || *cp > '9') { 731 /* Bogus unit number. */ 732 return (NULL); 733 } 734 i = (i * 10) + (*cp - ''); 735 } 736 } 737 738 if (unitp != NULL) 739 *unitp = i; 740 return (ifc); 741 } 742 743 /* 744 * Register a network interface cloner. 745 */ 746 void 747 if_clone_attach(ifc) 748 struct if_clone *ifc; 749 { 750 int bytoff, bitoff; 751 int err; 752 int len, maxclone; 753 int unit; 754 755 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit, 756 ("%s: %s requested more units then allowed (%d > %d)", 757 __func__, ifc->ifc_name, ifc->ifc_minifs, 758 ifc->ifc_maxunit + 1)); 759 /* 760 * Compute bitmap size and allocate it. 761 */ 762 maxclone = ifc->ifc_maxunit + 1; 763 len = maxclone >> 3; 764 if ((len << 3) < maxclone) 765 len++; 766 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO); 767 ifc->ifc_bmlen = len; 768 769 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 770 if_cloners_count++; 771 772 for (unit = 0; unit < ifc->ifc_minifs; unit++) { 773 err = (*ifc->ifc_create)(ifc, unit); 774 KASSERT(err == 0, 775 ("%s: failed to create required interface %s%d", 776 __func__, ifc->ifc_name, unit)); 777 778 /* Allocate the unit in the bitmap. */ 779 bytoff = unit >> 3; 780 bitoff = unit - (bytoff << 3); 781 ifc->ifc_units[bytoff] |= (1 << bitoff); 782 } 783 } 784 785 /* 786 * Unregister a network interface cloner. 787 */ 788 void 789 if_clone_detach(ifc) 790 struct if_clone *ifc; 791 { 792 793 LIST_REMOVE(ifc, ifc_list); 794 free(ifc->ifc_units, M_CLONE); 795 if_cloners_count--; 796 } 797 798 /* 799 * Provide list of interface cloners to userspace. 800 */ 801 static int 802 if_clone_list(ifcr) 803 struct if_clonereq *ifcr; 804 { 805 char outbuf[IFNAMSIZ], *dst; 806 struct if_clone *ifc; 807 int count, error = 0; 808 809 ifcr->ifcr_total = if_cloners_count; 810 if ((dst = ifcr->ifcr_buffer) == NULL) { 811 /* Just asking how many there are. */ 812 return (0); 813 } 814 815 if (ifcr->ifcr_count < 0) 816 return (EINVAL); 817 818 count = (if_cloners_count < ifcr->ifcr_count) ? 819 if_cloners_count : ifcr->ifcr_count; 820 821 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 822 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 823 strncpy(outbuf, ifc->ifc_name, IFNAMSIZ); 824 outbuf[IFNAMSIZ - 1] = '\0'; /* sanity */ 825 error = copyout(outbuf, dst, IFNAMSIZ); 826 if (error) 827 break; 828 } 829 830 return (error); 831 } 832 833 /* 834 * Locate an interface based on a complete address. 835 */ 836 /*ARGSUSED*/ 837 struct ifaddr * 838 ifa_ifwithaddr(addr) 839 struct sockaddr *addr; 840 { 841 struct ifnet *ifp; 842 struct ifaddr *ifa; 843 844 #define equal(a1, a2) \ 845 (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0) 846 TAILQ_FOREACH(ifp, &ifnet, if_link) 847 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 848 if (ifa->ifa_addr->sa_family != addr->sa_family) 849 continue; 850 if (equal(addr, ifa->ifa_addr)) 851 goto done; 852 /* IP6 doesn't have broadcast */ 853 if ((ifp->if_flags & IFF_BROADCAST) && 854 ifa->ifa_broadaddr && 855 ifa->ifa_broadaddr->sa_len != 0 && 856 equal(ifa->ifa_broadaddr, addr)) 857 goto done; 858 } 859 ifa = NULL; 860 done: 861 return (ifa); 862 } 863 864 /* 865 * Locate the point to point interface with a given destination address. 866 */ 867 /*ARGSUSED*/ 868 struct ifaddr * 869 ifa_ifwithdstaddr(addr) 870 struct sockaddr *addr; 871 { 872 struct ifnet *ifp; 873 struct ifaddr *ifa; 874 875 TAILQ_FOREACH(ifp, &ifnet, if_link) { 876 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 877 continue; 878 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 879 if (ifa->ifa_addr->sa_family != addr->sa_family) 880 continue; 881 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 882 goto done; 883 } 884 } 885 ifa = NULL; 886 done: 887 return (ifa); 888 } 889 890 /* 891 * Find an interface on a specific network. If many, choice 892 * is most specific found. 893 */ 894 struct ifaddr * 895 ifa_ifwithnet(addr) 896 struct sockaddr *addr; 897 { 898 register struct ifnet *ifp; 899 register struct ifaddr *ifa; 900 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 901 u_int af = addr->sa_family; 902 char *addr_data = addr->sa_data, *cplim; 903 904 /* 905 * AF_LINK addresses can be looked up directly by their index number, 906 * so do that if we can. 907 */ 908 if (af == AF_LINK) { 909 register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 910 if (sdl->sdl_index && sdl->sdl_index <= if_index) 911 return (ifaddr_byindex(sdl->sdl_index)); 912 } 913 914 /* 915 * Scan though each interface, looking for ones that have 916 * addresses in this address family. 917 */ 918 TAILQ_FOREACH(ifp, &ifnet, if_link) { 919 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 920 register char *cp, *cp2, *cp3; 921 922 if (ifa->ifa_addr->sa_family != af) 923 next: continue; 924 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 925 /* 926 * This is a bit broken as it doesn't 927 * take into account that the remote end may 928 * be a single node in the network we are 929 * looking for. 930 * The trouble is that we don't know the 931 * netmask for the remote end. 932 */ 933 if (ifa->ifa_dstaddr != 0 934 && equal(addr, ifa->ifa_dstaddr)) 935 goto done; 936 } else { 937 /* 938 * if we have a special address handler, 939 * then use it instead of the generic one. 940 */ 941 if (ifa->ifa_claim_addr) { 942 if ((*ifa->ifa_claim_addr)(ifa, addr)) 943 goto done; 944 continue; 945 } 946 947 /* 948 * Scan all the bits in the ifa's address. 949 * If a bit dissagrees with what we are 950 * looking for, mask it with the netmask 951 * to see if it really matters. 952 * (A byte at a time) 953 */ 954 if (ifa->ifa_netmask == 0) 955 continue; 956 cp = addr_data; 957 cp2 = ifa->ifa_addr->sa_data; 958 cp3 = ifa->ifa_netmask->sa_data; 959 cplim = ifa->ifa_netmask->sa_len 960 + (char *)ifa->ifa_netmask; 961 while (cp3 < cplim) 962 if ((*cp++ ^ *cp2++) & *cp3++) 963 goto next; /* next address! */ 964 /* 965 * If the netmask of what we just found 966 * is more specific than what we had before 967 * (if we had one) then remember the new one 968 * before continuing to search 969 * for an even better one. 970 */ 971 if (ifa_maybe == 0 || 972 rn_refines((caddr_t)ifa->ifa_netmask, 973 (caddr_t)ifa_maybe->ifa_netmask)) 974 ifa_maybe = ifa; 975 } 976 } 977 } 978 ifa = ifa_maybe; 979 done: 980 return (ifa); 981 } 982 983 /* 984 * Find an interface address specific to an interface best matching 985 * a given address. 986 */ 987 struct ifaddr * 988 ifaof_ifpforaddr(addr, ifp) 989 struct sockaddr *addr; 990 register struct ifnet *ifp; 991 { 992 register struct ifaddr *ifa; 993 register char *cp, *cp2, *cp3; 994 register char *cplim; 995 struct ifaddr *ifa_maybe = 0; 996 u_int af = addr->sa_family; 997 998 if (af >= AF_MAX) 999 return (0); 1000 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1001 if (ifa->ifa_addr->sa_family != af) 1002 continue; 1003 if (ifa_maybe == 0) 1004 ifa_maybe = ifa; 1005 if (ifa->ifa_netmask == 0) { 1006 if (equal(addr, ifa->ifa_addr) || 1007 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 1008 goto done; 1009 continue; 1010 } 1011 if (ifp->if_flags & IFF_POINTOPOINT) { 1012 if (equal(addr, ifa->ifa_dstaddr)) 1013 goto done; 1014 } else { 1015 cp = addr->sa_data; 1016 cp2 = ifa->ifa_addr->sa_data; 1017 cp3 = ifa->ifa_netmask->sa_data; 1018 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1019 for (; cp3 < cplim; cp3++) 1020 if ((*cp++ ^ *cp2++) & *cp3) 1021 break; 1022 if (cp3 == cplim) 1023 goto done; 1024 } 1025 } 1026 ifa = ifa_maybe; 1027 done: 1028 return (ifa); 1029 } 1030 1031 #include <net/route.h> 1032 1033 /* 1034 * Default action when installing a route with a Link Level gateway. 1035 * Lookup an appropriate real ifa to point to. 1036 * This should be moved to /sys/net/link.c eventually. 1037 */ 1038 static void 1039 link_rtrequest(cmd, rt, info) 1040 int cmd; 1041 register struct rtentry *rt; 1042 struct rt_addrinfo *info; 1043 { 1044 register struct ifaddr *ifa; 1045 struct sockaddr *dst; 1046 struct ifnet *ifp; 1047 1048 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1049 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1050 return; 1051 ifa = ifaof_ifpforaddr(dst, ifp); 1052 if (ifa) { 1053 IFAFREE(rt->rt_ifa); 1054 rt->rt_ifa = ifa; 1055 ifa->ifa_refcnt++; 1056 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1057 ifa->ifa_rtrequest(cmd, rt, info); 1058 } 1059 } 1060 1061 /* 1062 * Mark an interface down and notify protocols of 1063 * the transition. 1064 * NOTE: must be called at splnet or eqivalent. 1065 */ 1066 void 1067 if_unroute(ifp, flag, fam) 1068 register struct ifnet *ifp; 1069 int flag, fam; 1070 { 1071 register struct ifaddr *ifa; 1072 1073 ifp->if_flags &= ~flag; 1074 getmicrotime(&ifp->if_lastchange); 1075 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1076 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1077 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1078 if_qflush(&ifp->if_snd); 1079 rt_ifmsg(ifp); 1080 } 1081 1082 /* 1083 * Mark an interface up and notify protocols of 1084 * the transition. 1085 * NOTE: must be called at splnet or eqivalent. 1086 */ 1087 void 1088 if_route(ifp, flag, fam) 1089 register struct ifnet *ifp; 1090 int flag, fam; 1091 { 1092 register struct ifaddr *ifa; 1093 1094 ifp->if_flags |= flag; 1095 getmicrotime(&ifp->if_lastchange); 1096 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1097 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1098 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1099 rt_ifmsg(ifp); 1100 #ifdef INET6 1101 in6_if_up(ifp); 1102 #endif 1103 } 1104 1105 /* 1106 * Mark an interface down and notify protocols of 1107 * the transition. 1108 * NOTE: must be called at splnet or eqivalent. 1109 */ 1110 void 1111 if_down(ifp) 1112 register struct ifnet *ifp; 1113 { 1114 1115 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1116 } 1117 1118 /* 1119 * Mark an interface up and notify protocols of 1120 * the transition. 1121 * NOTE: must be called at splnet or eqivalent. 1122 */ 1123 void 1124 if_up(ifp) 1125 register struct ifnet *ifp; 1126 { 1127 1128 if_route(ifp, IFF_UP, AF_UNSPEC); 1129 } 1130 1131 /* 1132 * Flush an interface queue. 1133 */ 1134 static void 1135 if_qflush(ifq) 1136 register struct ifqueue *ifq; 1137 { 1138 register struct mbuf *m, *n; 1139 1140 n = ifq->ifq_head; 1141 while ((m = n) != 0) { 1142 n = m->m_act; 1143 m_freem(m); 1144 } 1145 ifq->ifq_head = 0; 1146 ifq->ifq_tail = 0; 1147 ifq->ifq_len = 0; 1148 } 1149 1150 /* 1151 * Handle interface watchdog timer routines. Called 1152 * from softclock, we decrement timers (if set) and 1153 * call the appropriate interface routine on expiration. 1154 */ 1155 static void 1156 if_slowtimo(arg) 1157 void *arg; 1158 { 1159 register struct ifnet *ifp; 1160 int s = splimp(); 1161 1162 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1163 if (ifp->if_timer == 0 || --ifp->if_timer) 1164 continue; 1165 if (ifp->if_watchdog) 1166 (*ifp->if_watchdog)(ifp); 1167 } 1168 splx(s); 1169 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1170 } 1171 1172 /* 1173 * Map interface name to 1174 * interface structure pointer. 1175 */ 1176 struct ifnet * 1177 ifunit(const char *name) 1178 { 1179 char namebuf[IFNAMSIZ + 1]; 1180 struct ifnet *ifp; 1181 dev_t dev; 1182 1183 /* 1184 * Now search all the interfaces for this name/number 1185 */ 1186 1187 /* 1188 * XXX 1189 * Devices should really be known as /dev/fooN, not /dev/net/fooN. 1190 */ 1191 snprintf(namebuf, IFNAMSIZ, "%s/%s", net_cdevsw.d_name, name); 1192 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1193 dev = ifdev_byindex(ifp->if_index); 1194 if (strcmp(devtoname(dev), namebuf) == 0) 1195 break; 1196 if (dev_named(dev, name)) 1197 break; 1198 } 1199 return (ifp); 1200 } 1201 1202 /* 1203 * Map interface name in a sockaddr_dl to 1204 * interface structure pointer. 1205 */ 1206 struct ifnet * 1207 if_withname(sa) 1208 struct sockaddr *sa; 1209 { 1210 char ifname[IFNAMSIZ+1]; 1211 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 1212 1213 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 1214 (sdl->sdl_nlen > IFNAMSIZ) ) 1215 return NULL; 1216 1217 /* 1218 * ifunit wants a NUL-terminated string. It may not be NUL-terminated 1219 * in the sockaddr, and we don't want to change the caller's sockaddr 1220 * (there might not be room to add the trailing NUL anyway), so we make 1221 * a local copy that we know we can NUL-terminate safely. 1222 */ 1223 1224 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 1225 ifname[sdl->sdl_nlen] = '\0'; 1226 return ifunit(ifname); 1227 } 1228 1229 /* 1230 * Hardware specific interface ioctls. 1231 */ 1232 static int 1233 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1234 { 1235 struct ifreq *ifr; 1236 struct ifstat *ifs; 1237 int error = 0; 1238 int new_flags; 1239 1240 ifr = (struct ifreq *)data; 1241 switch (cmd) { 1242 case SIOCGIFINDEX: 1243 ifr->ifr_index = ifp->if_index; 1244 break; 1245 1246 case SIOCGIFFLAGS: 1247 ifr->ifr_flags = ifp->if_flags & 0xffff; 1248 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1249 break; 1250 1251 case SIOCGIFCAP: 1252 ifr->ifr_reqcap = ifp->if_capabilities; 1253 ifr->ifr_curcap = ifp->if_capenable; 1254 break; 1255 1256 #ifdef MAC 1257 case SIOCGIFMAC: 1258 error = mac_ioctl_ifnet_get(td->td_proc->p_ucred, ifr, ifp); 1259 break; 1260 #endif 1261 1262 case SIOCGIFMETRIC: 1263 ifr->ifr_metric = ifp->if_metric; 1264 break; 1265 1266 case SIOCGIFMTU: 1267 ifr->ifr_mtu = ifp->if_mtu; 1268 break; 1269 1270 case SIOCGIFPHYS: 1271 ifr->ifr_phys = ifp->if_physical; 1272 break; 1273 1274 case SIOCSIFFLAGS: 1275 error = suser(td); 1276 if (error) 1277 return (error); 1278 new_flags = (ifr->ifr_flags & 0xffff) | 1279 (ifr->ifr_flagshigh << 16); 1280 if (ifp->if_flags & IFF_SMART) { 1281 /* Smart drivers twiddle their own routes */ 1282 } else if (ifp->if_flags & IFF_UP && 1283 (new_flags & IFF_UP) == 0) { 1284 int s = splimp(); 1285 if_down(ifp); 1286 splx(s); 1287 } else if (new_flags & IFF_UP && 1288 (ifp->if_flags & IFF_UP) == 0) { 1289 int s = splimp(); 1290 if_up(ifp); 1291 splx(s); 1292 } 1293 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1294 (new_flags &~ IFF_CANTCHANGE); 1295 if (new_flags & IFF_PPROMISC) { 1296 /* Permanently promiscuous mode requested */ 1297 ifp->if_flags |= IFF_PROMISC; 1298 } else if (ifp->if_pcount == 0) { 1299 ifp->if_flags &= ~IFF_PROMISC; 1300 } 1301 if (ifp->if_ioctl) 1302 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1303 getmicrotime(&ifp->if_lastchange); 1304 break; 1305 1306 case SIOCSIFCAP: 1307 error = suser(td); 1308 if (error) 1309 return (error); 1310 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1311 return (EINVAL); 1312 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1313 break; 1314 1315 #ifdef MAC 1316 case SIOCSIFMAC: 1317 error = mac_ioctl_ifnet_set(td->td_proc->p_ucred, ifr, ifp); 1318 break; 1319 #endif 1320 1321 case SIOCSIFMETRIC: 1322 error = suser(td); 1323 if (error) 1324 return (error); 1325 ifp->if_metric = ifr->ifr_metric; 1326 getmicrotime(&ifp->if_lastchange); 1327 break; 1328 1329 case SIOCSIFPHYS: 1330 error = suser(td); 1331 if (error) 1332 return error; 1333 if (!ifp->if_ioctl) 1334 return EOPNOTSUPP; 1335 error = (*ifp->if_ioctl)(ifp, cmd, data); 1336 if (error == 0) 1337 getmicrotime(&ifp->if_lastchange); 1338 return(error); 1339 1340 case SIOCSIFMTU: 1341 { 1342 u_long oldmtu = ifp->if_mtu; 1343 1344 error = suser(td); 1345 if (error) 1346 return (error); 1347 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1348 return (EINVAL); 1349 if (ifp->if_ioctl == NULL) 1350 return (EOPNOTSUPP); 1351 error = (*ifp->if_ioctl)(ifp, cmd, data); 1352 if (error == 0) { 1353 getmicrotime(&ifp->if_lastchange); 1354 rt_ifmsg(ifp); 1355 } 1356 /* 1357 * If the link MTU changed, do network layer specific procedure. 1358 */ 1359 if (ifp->if_mtu != oldmtu) { 1360 #ifdef INET6 1361 nd6_setmtu(ifp); 1362 #endif 1363 } 1364 break; 1365 } 1366 1367 case SIOCADDMULTI: 1368 case SIOCDELMULTI: 1369 error = suser(td); 1370 if (error) 1371 return (error); 1372 1373 /* Don't allow group membership on non-multicast interfaces. */ 1374 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1375 return (EOPNOTSUPP); 1376 1377 /* Don't let users screw up protocols' entries. */ 1378 if (ifr->ifr_addr.sa_family != AF_LINK) 1379 return (EINVAL); 1380 1381 if (cmd == SIOCADDMULTI) { 1382 struct ifmultiaddr *ifma; 1383 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1384 } else { 1385 error = if_delmulti(ifp, &ifr->ifr_addr); 1386 } 1387 if (error == 0) 1388 getmicrotime(&ifp->if_lastchange); 1389 break; 1390 1391 case SIOCSIFPHYADDR: 1392 case SIOCDIFPHYADDR: 1393 #ifdef INET6 1394 case SIOCSIFPHYADDR_IN6: 1395 #endif 1396 case SIOCSLIFPHYADDR: 1397 case SIOCSIFMEDIA: 1398 case SIOCSIFGENERIC: 1399 error = suser(td); 1400 if (error) 1401 return (error); 1402 if (ifp->if_ioctl == NULL) 1403 return (EOPNOTSUPP); 1404 error = (*ifp->if_ioctl)(ifp, cmd, data); 1405 if (error == 0) 1406 getmicrotime(&ifp->if_lastchange); 1407 break; 1408 1409 case SIOCGIFSTATUS: 1410 ifs = (struct ifstat *)data; 1411 ifs->ascii[0] = '\0'; 1412 1413 case SIOCGIFPSRCADDR: 1414 case SIOCGIFPDSTADDR: 1415 case SIOCGLIFPHYADDR: 1416 case SIOCGIFMEDIA: 1417 case SIOCGIFGENERIC: 1418 if (ifp->if_ioctl == 0) 1419 return (EOPNOTSUPP); 1420 error = (*ifp->if_ioctl)(ifp, cmd, data); 1421 break; 1422 1423 case SIOCSIFLLADDR: 1424 error = suser(td); 1425 if (error) 1426 return (error); 1427 error = if_setlladdr(ifp, 1428 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1429 break; 1430 1431 default: 1432 error = ENOIOCTL; 1433 break; 1434 } 1435 return (error); 1436 } 1437 1438 /* 1439 * Interface ioctls. 1440 */ 1441 int 1442 ifioctl(so, cmd, data, td) 1443 struct socket *so; 1444 u_long cmd; 1445 caddr_t data; 1446 struct thread *td; 1447 { 1448 struct ifnet *ifp; 1449 struct ifreq *ifr; 1450 int error; 1451 int oif_flags; 1452 1453 switch (cmd) { 1454 case SIOCGIFCONF: 1455 case OSIOCGIFCONF: 1456 return (ifconf(cmd, data)); 1457 } 1458 ifr = (struct ifreq *)data; 1459 1460 switch (cmd) { 1461 case SIOCIFCREATE: 1462 case SIOCIFDESTROY: 1463 if ((error = suser(td)) != 0) 1464 return (error); 1465 return ((cmd == SIOCIFCREATE) ? 1466 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1467 if_clone_destroy(ifr->ifr_name)); 1468 1469 case SIOCIFGCLONERS: 1470 return (if_clone_list((struct if_clonereq *)data)); 1471 } 1472 1473 ifp = ifunit(ifr->ifr_name); 1474 if (ifp == 0) 1475 return (ENXIO); 1476 1477 error = ifhwioctl(cmd, ifp, data, td); 1478 if (error != ENOIOCTL) 1479 return (error); 1480 1481 oif_flags = ifp->if_flags; 1482 if (so->so_proto == 0) 1483 return (EOPNOTSUPP); 1484 #ifndef COMPAT_43 1485 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1486 data, 1487 ifp, td)); 1488 #else 1489 { 1490 int ocmd = cmd; 1491 1492 switch (cmd) { 1493 1494 case SIOCSIFDSTADDR: 1495 case SIOCSIFADDR: 1496 case SIOCSIFBRDADDR: 1497 case SIOCSIFNETMASK: 1498 #if BYTE_ORDER != BIG_ENDIAN 1499 if (ifr->ifr_addr.sa_family == 0 && 1500 ifr->ifr_addr.sa_len < 16) { 1501 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1502 ifr->ifr_addr.sa_len = 16; 1503 } 1504 #else 1505 if (ifr->ifr_addr.sa_len == 0) 1506 ifr->ifr_addr.sa_len = 16; 1507 #endif 1508 break; 1509 1510 case OSIOCGIFADDR: 1511 cmd = SIOCGIFADDR; 1512 break; 1513 1514 case OSIOCGIFDSTADDR: 1515 cmd = SIOCGIFDSTADDR; 1516 break; 1517 1518 case OSIOCGIFBRDADDR: 1519 cmd = SIOCGIFBRDADDR; 1520 break; 1521 1522 case OSIOCGIFNETMASK: 1523 cmd = SIOCGIFNETMASK; 1524 } 1525 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1526 cmd, 1527 data, 1528 ifp, td)); 1529 switch (ocmd) { 1530 1531 case OSIOCGIFADDR: 1532 case OSIOCGIFDSTADDR: 1533 case OSIOCGIFBRDADDR: 1534 case OSIOCGIFNETMASK: 1535 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1536 1537 } 1538 } 1539 #endif /* COMPAT_43 */ 1540 1541 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1542 #ifdef INET6 1543 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1544 if (ifp->if_flags & IFF_UP) { 1545 int s = splimp(); 1546 in6_if_up(ifp); 1547 splx(s); 1548 } 1549 #endif 1550 } 1551 return (error); 1552 } 1553 1554 /* 1555 * Set/clear promiscuous mode on interface ifp based on the truth value 1556 * of pswitch. The calls are reference counted so that only the first 1557 * "on" request actually has an effect, as does the final "off" request. 1558 * Results are undefined if the "off" and "on" requests are not matched. 1559 */ 1560 int 1561 ifpromisc(ifp, pswitch) 1562 struct ifnet *ifp; 1563 int pswitch; 1564 { 1565 struct ifreq ifr; 1566 int error; 1567 int oldflags, oldpcount; 1568 1569 oldpcount = ifp->if_pcount; 1570 oldflags = ifp->if_flags; 1571 if (ifp->if_flags & IFF_PPROMISC) { 1572 /* Do nothing if device is in permanently promiscuous mode */ 1573 ifp->if_pcount += pswitch ? 1 : -1; 1574 return (0); 1575 } 1576 if (pswitch) { 1577 /* 1578 * If the device is not configured up, we cannot put it in 1579 * promiscuous mode. 1580 */ 1581 if ((ifp->if_flags & IFF_UP) == 0) 1582 return (ENETDOWN); 1583 if (ifp->if_pcount++ != 0) 1584 return (0); 1585 ifp->if_flags |= IFF_PROMISC; 1586 } else { 1587 if (--ifp->if_pcount > 0) 1588 return (0); 1589 ifp->if_flags &= ~IFF_PROMISC; 1590 } 1591 ifr.ifr_flags = ifp->if_flags & 0xffff; 1592 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1593 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1594 if (error == 0) { 1595 log(LOG_INFO, "%s%d: promiscuous mode %s\n", 1596 ifp->if_name, ifp->if_unit, 1597 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1598 rt_ifmsg(ifp); 1599 } else { 1600 ifp->if_pcount = oldpcount; 1601 ifp->if_flags = oldflags; 1602 } 1603 return error; 1604 } 1605 1606 /* 1607 * Return interface configuration 1608 * of system. List may be used 1609 * in later ioctl's (above) to get 1610 * other information. 1611 */ 1612 /*ARGSUSED*/ 1613 static int 1614 ifconf(cmd, data) 1615 u_long cmd; 1616 caddr_t data; 1617 { 1618 struct ifconf *ifc = (struct ifconf *)data; 1619 struct ifnet *ifp; 1620 struct ifaddr *ifa; 1621 struct ifreq ifr, *ifrp; 1622 int space = ifc->ifc_len, error = 0; 1623 1624 ifrp = ifc->ifc_req; 1625 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1626 char workbuf[64]; 1627 int ifnlen, addrs; 1628 1629 if (space < sizeof(ifr)) 1630 break; 1631 ifnlen = snprintf(workbuf, sizeof(workbuf), 1632 "%s%d", ifp->if_name, ifp->if_unit); 1633 if(ifnlen + 1 > sizeof ifr.ifr_name) { 1634 error = ENAMETOOLONG; 1635 break; 1636 } else { 1637 strcpy(ifr.ifr_name, workbuf); 1638 } 1639 1640 addrs = 0; 1641 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1642 struct sockaddr *sa = ifa->ifa_addr; 1643 1644 if (space < sizeof(ifr)) 1645 break; 1646 if (jailed(curthread->td_ucred) && 1647 prison_if(curthread->td_ucred, sa)) 1648 continue; 1649 addrs++; 1650 #ifdef COMPAT_43 1651 if (cmd == OSIOCGIFCONF) { 1652 struct osockaddr *osa = 1653 (struct osockaddr *)&ifr.ifr_addr; 1654 ifr.ifr_addr = *sa; 1655 osa->sa_family = sa->sa_family; 1656 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1657 sizeof (ifr)); 1658 ifrp++; 1659 } else 1660 #endif 1661 if (sa->sa_len <= sizeof(*sa)) { 1662 ifr.ifr_addr = *sa; 1663 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1664 sizeof (ifr)); 1665 ifrp++; 1666 } else { 1667 if (space < sizeof (ifr) + sa->sa_len - 1668 sizeof(*sa)) 1669 break; 1670 space -= sa->sa_len - sizeof(*sa); 1671 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1672 sizeof (ifr.ifr_name)); 1673 if (error == 0) 1674 error = copyout((caddr_t)sa, 1675 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 1676 ifrp = (struct ifreq *) 1677 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1678 } 1679 if (error) 1680 break; 1681 space -= sizeof (ifr); 1682 } 1683 if (error) 1684 break; 1685 if (!addrs) { 1686 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1687 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1688 sizeof (ifr)); 1689 if (error) 1690 break; 1691 space -= sizeof (ifr); 1692 ifrp++; 1693 } 1694 } 1695 ifc->ifc_len -= space; 1696 return (error); 1697 } 1698 1699 /* 1700 * Just like if_promisc(), but for all-multicast-reception mode. 1701 */ 1702 int 1703 if_allmulti(ifp, onswitch) 1704 struct ifnet *ifp; 1705 int onswitch; 1706 { 1707 int error = 0; 1708 int s = splimp(); 1709 struct ifreq ifr; 1710 1711 if (onswitch) { 1712 if (ifp->if_amcount++ == 0) { 1713 ifp->if_flags |= IFF_ALLMULTI; 1714 ifr.ifr_flags = ifp->if_flags & 0xffff; 1715 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1716 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1717 } 1718 } else { 1719 if (ifp->if_amcount > 1) { 1720 ifp->if_amcount--; 1721 } else { 1722 ifp->if_amcount = 0; 1723 ifp->if_flags &= ~IFF_ALLMULTI; 1724 ifr.ifr_flags = ifp->if_flags & 0xffff;; 1725 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1726 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1727 } 1728 } 1729 splx(s); 1730 1731 if (error == 0) 1732 rt_ifmsg(ifp); 1733 return error; 1734 } 1735 1736 /* 1737 * Add a multicast listenership to the interface in question. 1738 * The link layer provides a routine which converts 1739 */ 1740 int 1741 if_addmulti(ifp, sa, retifma) 1742 struct ifnet *ifp; /* interface to manipulate */ 1743 struct sockaddr *sa; /* address to add */ 1744 struct ifmultiaddr **retifma; 1745 { 1746 struct sockaddr *llsa, *dupsa; 1747 int error, s; 1748 struct ifmultiaddr *ifma; 1749 1750 /* 1751 * If the matching multicast address already exists 1752 * then don't add a new one, just add a reference 1753 */ 1754 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1755 if (equal(sa, ifma->ifma_addr)) { 1756 ifma->ifma_refcount++; 1757 if (retifma) 1758 *retifma = ifma; 1759 return 0; 1760 } 1761 } 1762 1763 /* 1764 * Give the link layer a chance to accept/reject it, and also 1765 * find out which AF_LINK address this maps to, if it isn't one 1766 * already. 1767 */ 1768 if (ifp->if_resolvemulti) { 1769 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1770 if (error) return error; 1771 } else { 1772 llsa = 0; 1773 } 1774 1775 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1776 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1777 bcopy(sa, dupsa, sa->sa_len); 1778 1779 ifma->ifma_addr = dupsa; 1780 ifma->ifma_lladdr = llsa; 1781 ifma->ifma_ifp = ifp; 1782 ifma->ifma_refcount = 1; 1783 ifma->ifma_protospec = 0; 1784 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1785 1786 /* 1787 * Some network interfaces can scan the address list at 1788 * interrupt time; lock them out. 1789 */ 1790 s = splimp(); 1791 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1792 splx(s); 1793 if (retifma != NULL) 1794 *retifma = ifma; 1795 1796 if (llsa != 0) { 1797 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1798 if (equal(ifma->ifma_addr, llsa)) 1799 break; 1800 } 1801 if (ifma) { 1802 ifma->ifma_refcount++; 1803 } else { 1804 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1805 M_IFMADDR, M_WAITOK); 1806 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1807 M_IFMADDR, M_WAITOK); 1808 bcopy(llsa, dupsa, llsa->sa_len); 1809 ifma->ifma_addr = dupsa; 1810 ifma->ifma_ifp = ifp; 1811 ifma->ifma_refcount = 1; 1812 s = splimp(); 1813 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1814 splx(s); 1815 } 1816 } 1817 /* 1818 * We are certain we have added something, so call down to the 1819 * interface to let them know about it. 1820 */ 1821 s = splimp(); 1822 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1823 splx(s); 1824 1825 return 0; 1826 } 1827 1828 /* 1829 * Remove a reference to a multicast address on this interface. Yell 1830 * if the request does not match an existing membership. 1831 */ 1832 int 1833 if_delmulti(ifp, sa) 1834 struct ifnet *ifp; 1835 struct sockaddr *sa; 1836 { 1837 struct ifmultiaddr *ifma; 1838 int s; 1839 1840 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1841 if (equal(sa, ifma->ifma_addr)) 1842 break; 1843 if (ifma == 0) 1844 return ENOENT; 1845 1846 if (ifma->ifma_refcount > 1) { 1847 ifma->ifma_refcount--; 1848 return 0; 1849 } 1850 1851 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1852 sa = ifma->ifma_lladdr; 1853 s = splimp(); 1854 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1855 /* 1856 * Make sure the interface driver is notified 1857 * in the case of a link layer mcast group being left. 1858 */ 1859 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1860 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1861 splx(s); 1862 free(ifma->ifma_addr, M_IFMADDR); 1863 free(ifma, M_IFMADDR); 1864 if (sa == 0) 1865 return 0; 1866 1867 /* 1868 * Now look for the link-layer address which corresponds to 1869 * this network address. It had been squirreled away in 1870 * ifma->ifma_lladdr for this purpose (so we don't have 1871 * to call ifp->if_resolvemulti() again), and we saved that 1872 * value in sa above. If some nasty deleted the 1873 * link-layer address out from underneath us, we can deal because 1874 * the address we stored was is not the same as the one which was 1875 * in the record for the link-layer address. (So we don't complain 1876 * in that case.) 1877 */ 1878 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1879 if (equal(sa, ifma->ifma_addr)) 1880 break; 1881 if (ifma == 0) 1882 return 0; 1883 1884 if (ifma->ifma_refcount > 1) { 1885 ifma->ifma_refcount--; 1886 return 0; 1887 } 1888 1889 s = splimp(); 1890 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1891 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1892 splx(s); 1893 free(ifma->ifma_addr, M_IFMADDR); 1894 free(sa, M_IFMADDR); 1895 free(ifma, M_IFMADDR); 1896 1897 return 0; 1898 } 1899 1900 /* 1901 * Set the link layer address on an interface. 1902 * 1903 * At this time we only support certain types of interfaces, 1904 * and we don't allow the length of the address to change. 1905 */ 1906 int 1907 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1908 { 1909 struct sockaddr_dl *sdl; 1910 struct ifaddr *ifa; 1911 struct ifreq ifr; 1912 1913 ifa = ifaddr_byindex(ifp->if_index); 1914 if (ifa == NULL) 1915 return (EINVAL); 1916 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1917 if (sdl == NULL) 1918 return (EINVAL); 1919 if (len != sdl->sdl_alen) /* don't allow length to change */ 1920 return (EINVAL); 1921 switch (ifp->if_type) { 1922 case IFT_ETHER: /* these types use struct arpcom */ 1923 case IFT_FDDI: 1924 case IFT_XETHER: 1925 case IFT_ISO88025: 1926 case IFT_L2VLAN: 1927 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1928 bcopy(lladdr, LLADDR(sdl), len); 1929 break; 1930 default: 1931 return (ENODEV); 1932 } 1933 /* 1934 * If the interface is already up, we need 1935 * to re-init it in order to reprogram its 1936 * address filter. 1937 */ 1938 if ((ifp->if_flags & IFF_UP) != 0) { 1939 ifp->if_flags &= ~IFF_UP; 1940 ifr.ifr_flags = ifp->if_flags & 0xffff; 1941 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1942 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1943 ifp->if_flags |= IFF_UP; 1944 ifr.ifr_flags = ifp->if_flags & 0xffff; 1945 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1946 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1947 #ifdef INET 1948 /* 1949 * Also send gratuitous ARPs to notify other nodes about 1950 * the address change. 1951 */ 1952 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1953 if (ifa->ifa_addr != NULL && 1954 ifa->ifa_addr->sa_family == AF_INET) 1955 arp_ifinit(ifp, ifa); 1956 } 1957 #endif 1958 } 1959 return (0); 1960 } 1961 1962 struct ifmultiaddr * 1963 ifmaof_ifpforaddr(sa, ifp) 1964 struct sockaddr *sa; 1965 struct ifnet *ifp; 1966 { 1967 struct ifmultiaddr *ifma; 1968 1969 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1970 if (equal(ifma->ifma_addr, sa)) 1971 break; 1972 1973 return ifma; 1974 } 1975 1976 int 1977 if_printf(struct ifnet *ifp, const char * fmt, ...) 1978 { 1979 va_list ap; 1980 int retval; 1981 1982 retval = printf("%s%d: ", ifp->if_name, ifp->if_unit); 1983 va_start(ap, fmt); 1984 retval += vprintf(fmt, ap); 1985 va_end(ap); 1986 return (retval); 1987 } 1988 1989 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1990 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
Cache object: f8f701979d3101d788fa87c08149ce33
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