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 8.3 (Berkeley) 1/4/94 34 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $ 35 * $DragonFly: src/sys/net/if.c,v 1.24 2005/01/06 09:14:13 hsu Exp $ 36 */ 37 38 #include "opt_compat.h" 39 #include "opt_inet6.h" 40 #include "opt_inet.h" 41 42 #include <sys/param.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/systm.h> 46 #include <sys/proc.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/socketops.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/sockio.h> 54 #include <sys/syslog.h> 55 #include <sys/sysctl.h> 56 57 #include <net/if.h> 58 #include <net/if_arp.h> 59 #include <net/if_dl.h> 60 #include <net/if_types.h> 61 #include <net/if_var.h> 62 #include <net/radix.h> 63 #include <net/route.h> 64 #include <machine/stdarg.h> 65 66 #if defined(INET) || defined(INET6) 67 /*XXX*/ 68 #include <netinet/in.h> 69 #include <netinet/in_var.h> 70 #include <netinet/if_ether.h> 71 #ifdef INET6 72 #include <machine/clock.h> /* XXX: temporal workaround for fxp issue */ 73 #include <netinet6/in6_var.h> 74 #include <netinet6/in6_ifattach.h> 75 #endif 76 #endif 77 78 #if defined(COMPAT_43) 79 #include <emulation/43bsd/43bsd_socket.h> 80 #endif /* COMPAT_43 */ 81 82 /* 83 * System initialization 84 */ 85 86 static int ifconf (u_long, caddr_t, struct thread *); 87 static void ifinit (void *); 88 static void if_qflush (struct ifqueue *); 89 static void if_slowtimo (void *); 90 static void link_rtrequest (int, struct rtentry *, struct rt_addrinfo *); 91 static int if_rtdel (struct radix_node *, void *); 92 93 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL) 94 95 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 96 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 97 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework"); 98 99 int ifqmaxlen = IFQ_MAXLEN; 100 struct ifnethead ifnet; /* depend on static init XXX */ 101 102 #ifdef INET6 103 /* 104 * XXX: declare here to avoid to include many inet6 related files.. 105 * should be more generalized? 106 */ 107 extern void nd6_setmtu (struct ifnet *); 108 #endif 109 110 struct if_clone *if_clone_lookup (const char *, int *); 111 int if_clone_list (struct if_clonereq *); 112 113 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 114 int if_cloners_count; 115 116 struct callout if_slowtimo_timer; 117 118 /* 119 * Network interface utility routines. 120 * 121 * Routines with ifa_ifwith* names take sockaddr *'s as 122 * parameters. 123 */ 124 /* ARGSUSED*/ 125 void 126 ifinit(void *dummy) 127 { 128 struct ifnet *ifp; 129 int s; 130 131 callout_init(&if_slowtimo_timer); 132 133 s = splimp(); 134 TAILQ_FOREACH(ifp, &ifnet, if_link) { 135 if (ifp->if_snd.ifq_maxlen == 0) { 136 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 137 ifp->if_snd.ifq_maxlen = ifqmaxlen; 138 } 139 } 140 splx(s); 141 142 if_slowtimo(0); 143 } 144 145 int if_index = 0; 146 struct ifaddr **ifnet_addrs; 147 struct ifnet **ifindex2ifnet = NULL; 148 149 /* 150 * Attach an interface to the 151 * list of "active" interfaces. 152 */ 153 void 154 if_attach(struct ifnet *ifp) 155 { 156 unsigned socksize, ifasize; 157 int namelen, masklen; 158 struct sockaddr_dl *sdl; 159 struct ifaddr *ifa; 160 static int if_indexlim = 8; 161 static int inited; 162 163 if (!inited) { 164 TAILQ_INIT(&ifnet); 165 inited = 1; 166 } 167 168 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 169 ifp->if_index = ++if_index; 170 /* 171 * XXX - 172 * The old code would work if the interface passed a pre-existing 173 * chain of ifaddrs to this code. We don't trust our callers to 174 * properly initialize the tailq, however, so we no longer allow 175 * this unlikely case. 176 */ 177 TAILQ_INIT(&ifp->if_addrhead); 178 TAILQ_INIT(&ifp->if_prefixhead); 179 LIST_INIT(&ifp->if_multiaddrs); 180 getmicrotime(&ifp->if_lastchange); 181 if (ifnet_addrs == NULL || if_index >= if_indexlim) { 182 unsigned n = (if_indexlim <<= 1) * sizeof(ifa); 183 caddr_t q = malloc(n, M_IFADDR, M_WAITOK); 184 bzero(q, n); 185 if (ifnet_addrs != NULL) { 186 bcopy(ifnet_addrs, q, n/2); 187 free(ifnet_addrs, M_IFADDR); 188 } 189 ifnet_addrs = (struct ifaddr **)q; 190 191 /* grow ifindex2ifnet */ 192 n = if_indexlim * sizeof(struct ifnet *); 193 q = malloc(n, M_IFADDR, M_WAITOK); 194 bzero(q, n); 195 if (ifindex2ifnet) { 196 bcopy(ifindex2ifnet, q, n/2); 197 free(ifindex2ifnet, M_IFADDR); 198 } 199 ifindex2ifnet = (struct ifnet **)q; 200 } 201 202 ifindex2ifnet[if_index] = ifp; 203 204 /* 205 * create a Link Level name for this device 206 */ 207 namelen = strlen(ifp->if_xname); 208 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m)) 209 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen; 210 socksize = masklen + ifp->if_addrlen; 211 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1))) 212 if (socksize < sizeof(*sdl)) 213 socksize = sizeof(*sdl); 214 socksize = ROUNDUP(socksize); 215 ifasize = sizeof(*ifa) + 2 * socksize; 216 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK); 217 if (ifa) { 218 bzero(ifa, ifasize); 219 sdl = (struct sockaddr_dl *)(ifa + 1); 220 sdl->sdl_len = socksize; 221 sdl->sdl_family = AF_LINK; 222 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 223 sdl->sdl_nlen = namelen; 224 sdl->sdl_index = ifp->if_index; 225 sdl->sdl_type = ifp->if_type; 226 ifnet_addrs[if_index - 1] = ifa; 227 ifa->ifa_ifp = ifp; 228 ifa->ifa_rtrequest = link_rtrequest; 229 ifa->ifa_addr = (struct sockaddr *)sdl; 230 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 231 ifa->ifa_netmask = (struct sockaddr *)sdl; 232 sdl->sdl_len = masklen; 233 while (namelen != 0) 234 sdl->sdl_data[--namelen] = 0xff; 235 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 236 } 237 238 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 239 240 /* Announce the interface. */ 241 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 242 } 243 244 /* 245 * Detach an interface, removing it from the 246 * list of "active" interfaces. 247 */ 248 void 249 if_detach(struct ifnet *ifp) 250 { 251 struct ifaddr *ifa; 252 struct radix_node_head *rnh; 253 int s; 254 int i; 255 256 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 257 258 /* 259 * Remove routes and flush queues. 260 */ 261 s = splnet(); 262 if_down(ifp); 263 264 /* 265 * Remove address from ifnet_addrs[] and maybe decrement if_index. 266 * Clean up all addresses. 267 */ 268 ifnet_addrs[ifp->if_index - 1] = 0; 269 while (if_index > 0 && ifnet_addrs[if_index - 1] == 0) 270 if_index--; 271 272 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 273 ifa = TAILQ_FIRST(&ifp->if_addrhead)) { 274 #ifdef INET 275 /* XXX: Ugly!! ad hoc just for INET */ 276 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 277 struct ifaliasreq ifr; 278 279 bzero(&ifr, sizeof ifr); 280 ifr.ifra_addr = *ifa->ifa_addr; 281 if (ifa->ifa_dstaddr) 282 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 283 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 284 NULL) == 0) 285 continue; 286 } 287 #endif /* INET */ 288 #ifdef INET6 289 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 290 in6_purgeaddr(ifa); 291 /* ifp_addrhead is already updated */ 292 continue; 293 } 294 #endif /* INET6 */ 295 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 296 IFAFREE(ifa); 297 } 298 299 #ifdef INET6 300 /* 301 * Remove all IPv6 kernel structs related to ifp. This should be done 302 * before removing routing entries below, since IPv6 interface direct 303 * routes are expected to be removed by the IPv6-specific kernel API. 304 * Otherwise, the kernel will detect some inconsistency and bark it. 305 */ 306 in6_ifdetach(ifp); 307 #endif 308 309 /* 310 * Delete all remaining routes using this interface 311 * Unfortuneatly the only way to do this is to slog through 312 * the entire routing table looking for routes which point 313 * to this interface...oh well... 314 */ 315 for (i = 1; i <= AF_MAX; i++) { 316 if ((rnh = rt_tables[i]) == NULL) 317 continue; 318 rnh->rnh_walktree(rnh, if_rtdel, ifp); 319 } 320 321 /* Announce that the interface is gone. */ 322 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 323 324 ifindex2ifnet[ifp->if_index] = NULL; 325 326 TAILQ_REMOVE(&ifnet, ifp, if_link); 327 splx(s); 328 } 329 330 /* 331 * Delete Routes for a Network Interface 332 * 333 * Called for each routing entry via the rnh->rnh_walktree() call above 334 * to delete all route entries referencing a detaching network interface. 335 * 336 * Arguments: 337 * rn pointer to node in the routing table 338 * arg argument passed to rnh->rnh_walktree() - detaching interface 339 * 340 * Returns: 341 * 0 successful 342 * errno failed - reason indicated 343 * 344 */ 345 static int 346 if_rtdel(struct radix_node *rn, void *arg) 347 { 348 struct rtentry *rt = (struct rtentry *)rn; 349 struct ifnet *ifp = arg; 350 int err; 351 352 if (rt->rt_ifp == ifp) { 353 354 /* 355 * Protect (sorta) against walktree recursion problems 356 * with cloned routes 357 */ 358 if (!(rt->rt_flags & RTF_UP)) 359 return (0); 360 361 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 362 rt_mask(rt), rt->rt_flags, 363 (struct rtentry **) NULL); 364 if (err) { 365 log(LOG_WARNING, "if_rtdel: error %d\n", err); 366 } 367 } 368 369 return (0); 370 } 371 372 /* 373 * Create a clone network interface. 374 */ 375 int 376 if_clone_create(char *name, int len) 377 { 378 struct if_clone *ifc; 379 char *dp; 380 int wildcard, bytoff, bitoff; 381 int unit; 382 int err; 383 384 ifc = if_clone_lookup(name, &unit); 385 if (ifc == NULL) 386 return (EINVAL); 387 388 if (ifunit(name) != NULL) 389 return (EEXIST); 390 391 bytoff = bitoff = 0; 392 wildcard = (unit < 0); 393 /* 394 * Find a free unit if none was given. 395 */ 396 if (wildcard) { 397 while (bytoff < ifc->ifc_bmlen && 398 ifc->ifc_units[bytoff] == 0xff) 399 bytoff++; 400 if (bytoff >= ifc->ifc_bmlen) 401 return (ENOSPC); 402 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) 403 bitoff++; 404 unit = (bytoff << 3) + bitoff; 405 } 406 407 if (unit > ifc->ifc_maxunit) 408 return (ENXIO); 409 410 err = (*ifc->ifc_create)(ifc, unit); 411 if (err != 0) 412 return (err); 413 414 if (!wildcard) { 415 bytoff = unit >> 3; 416 bitoff = unit - (bytoff << 3); 417 } 418 419 /* 420 * Allocate the unit in the bitmap. 421 */ 422 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0, 423 ("%s: bit is already set", __func__)); 424 ifc->ifc_units[bytoff] |= (1 << bitoff); 425 426 /* In the wildcard case, we need to update the name. */ 427 if (wildcard) { 428 for (dp = name; *dp != '\0'; dp++); 429 if (snprintf(dp, len - (dp-name), "%d", unit) > 430 len - (dp-name) - 1) { 431 /* 432 * This can only be a programmer error and 433 * there's no straightforward way to recover if 434 * it happens. 435 */ 436 panic("if_clone_create(): interface name too long"); 437 } 438 439 } 440 441 EVENTHANDLER_INVOKE(if_clone_event, ifc); 442 443 return (0); 444 } 445 446 /* 447 * Destroy a clone network interface. 448 */ 449 int 450 if_clone_destroy(const char *name) 451 { 452 struct if_clone *ifc; 453 struct ifnet *ifp; 454 int bytoff, bitoff; 455 int unit; 456 457 ifc = if_clone_lookup(name, &unit); 458 if (ifc == NULL) 459 return (EINVAL); 460 461 if (unit < ifc->ifc_minifs) 462 return (EINVAL); 463 464 ifp = ifunit(name); 465 if (ifp == NULL) 466 return (ENXIO); 467 468 if (ifc->ifc_destroy == NULL) 469 return (EOPNOTSUPP); 470 471 (*ifc->ifc_destroy)(ifp); 472 473 /* 474 * Compute offset in the bitmap and deallocate the unit. 475 */ 476 bytoff = unit >> 3; 477 bitoff = unit - (bytoff << 3); 478 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0, 479 ("%s: bit is already cleared", __func__)); 480 ifc->ifc_units[bytoff] &= ~(1 << bitoff); 481 return (0); 482 } 483 484 /* 485 * Look up a network interface cloner. 486 */ 487 struct if_clone * 488 if_clone_lookup(const char *name, int *unitp) 489 { 490 struct if_clone *ifc; 491 const char *cp; 492 int i; 493 494 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) { 495 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) { 496 if (ifc->ifc_name[i] != *cp) 497 goto next_ifc; 498 } 499 goto found_name; 500 next_ifc: 501 ifc = LIST_NEXT(ifc, ifc_list); 502 } 503 504 /* No match. */ 505 return ((struct if_clone *)NULL); 506 507 found_name: 508 if (*cp == '\0') { 509 i = -1; 510 } else { 511 for (i = 0; *cp != '\0'; cp++) { 512 if (*cp < '0' || *cp > '9') { 513 /* Bogus unit number. */ 514 return (NULL); 515 } 516 i = (i * 10) + (*cp - '0'); 517 } 518 } 519 520 if (unitp != NULL) 521 *unitp = i; 522 return (ifc); 523 } 524 525 /* 526 * Register a network interface cloner. 527 */ 528 void 529 if_clone_attach(struct if_clone *ifc) 530 { 531 int bytoff, bitoff; 532 int err; 533 int len, maxclone; 534 int unit; 535 536 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit, 537 ("%s: %s requested more units then allowed (%d > %d)", 538 __func__, ifc->ifc_name, ifc->ifc_minifs, 539 ifc->ifc_maxunit + 1)); 540 /* 541 * Compute bitmap size and allocate it. 542 */ 543 maxclone = ifc->ifc_maxunit + 1; 544 len = maxclone >> 3; 545 if ((len << 3) < maxclone) 546 len++; 547 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO); 548 ifc->ifc_bmlen = len; 549 550 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 551 if_cloners_count++; 552 553 for (unit = 0; unit < ifc->ifc_minifs; unit++) { 554 err = (*ifc->ifc_create)(ifc, unit); 555 KASSERT(err == 0, 556 ("%s: failed to create required interface %s%d", 557 __func__, ifc->ifc_name, unit)); 558 559 /* Allocate the unit in the bitmap. */ 560 bytoff = unit >> 3; 561 bitoff = unit - (bytoff << 3); 562 ifc->ifc_units[bytoff] |= (1 << bitoff); 563 } 564 } 565 566 /* 567 * Unregister a network interface cloner. 568 */ 569 void 570 if_clone_detach(struct if_clone *ifc) 571 { 572 573 LIST_REMOVE(ifc, ifc_list); 574 free(ifc->ifc_units, M_CLONE); 575 if_cloners_count--; 576 } 577 578 /* 579 * Provide list of interface cloners to userspace. 580 */ 581 int 582 if_clone_list(struct if_clonereq *ifcr) 583 { 584 char outbuf[IFNAMSIZ], *dst; 585 struct if_clone *ifc; 586 int count, error = 0; 587 588 ifcr->ifcr_total = if_cloners_count; 589 if ((dst = ifcr->ifcr_buffer) == NULL) { 590 /* Just asking how many there are. */ 591 return (0); 592 } 593 594 if (ifcr->ifcr_count < 0) 595 return (EINVAL); 596 597 count = (if_cloners_count < ifcr->ifcr_count) ? 598 if_cloners_count : ifcr->ifcr_count; 599 600 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 601 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 602 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ); 603 error = copyout(outbuf, dst, IFNAMSIZ); 604 if (error) 605 break; 606 } 607 608 return (error); 609 } 610 611 /* 612 * Locate an interface based on a complete address. 613 */ 614 struct ifaddr * 615 ifa_ifwithaddr(struct sockaddr *addr) 616 { 617 struct ifnet *ifp; 618 struct ifaddr *ifa; 619 620 TAILQ_FOREACH(ifp, &ifnet, if_link) 621 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 622 if (ifa->ifa_addr->sa_family != addr->sa_family) 623 continue; 624 if (sa_equal(addr, ifa->ifa_addr)) 625 return (ifa); 626 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && 627 /* IPv6 doesn't have broadcast */ 628 ifa->ifa_broadaddr->sa_len != 0 && 629 sa_equal(ifa->ifa_broadaddr, addr)) 630 return (ifa); 631 } 632 return ((struct ifaddr *)NULL); 633 } 634 /* 635 * Locate the point to point interface with a given destination address. 636 */ 637 struct ifaddr * 638 ifa_ifwithdstaddr(struct sockaddr *addr) 639 { 640 struct ifnet *ifp; 641 struct ifaddr *ifa; 642 643 TAILQ_FOREACH(ifp, &ifnet, if_link) 644 if (ifp->if_flags & IFF_POINTOPOINT) 645 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 646 if (ifa->ifa_addr->sa_family != addr->sa_family) 647 continue; 648 if (ifa->ifa_dstaddr && 649 sa_equal(addr, ifa->ifa_dstaddr)) 650 return (ifa); 651 } 652 return ((struct ifaddr *)NULL); 653 } 654 655 /* 656 * Find an interface on a specific network. If many, choice 657 * is most specific found. 658 */ 659 struct ifaddr * 660 ifa_ifwithnet(struct sockaddr *addr) 661 { 662 struct ifnet *ifp; 663 struct ifaddr *ifa; 664 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 665 u_int af = addr->sa_family; 666 char *addr_data = addr->sa_data, *cplim; 667 668 /* 669 * AF_LINK addresses can be looked up directly by their index number, 670 * so do that if we can. 671 */ 672 if (af == AF_LINK) { 673 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 674 if (sdl->sdl_index && sdl->sdl_index <= if_index) 675 return (ifnet_addrs[sdl->sdl_index - 1]); 676 } 677 678 /* 679 * Scan though each interface, looking for ones that have 680 * addresses in this address family. 681 */ 682 TAILQ_FOREACH(ifp, &ifnet, if_link) { 683 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 684 char *cp, *cp2, *cp3; 685 686 if (ifa->ifa_addr->sa_family != af) 687 next: continue; 688 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 689 /* 690 * This is a bit broken as it doesn't 691 * take into account that the remote end may 692 * be a single node in the network we are 693 * looking for. 694 * The trouble is that we don't know the 695 * netmask for the remote end. 696 */ 697 if (ifa->ifa_dstaddr != NULL && 698 sa_equal(addr, ifa->ifa_dstaddr)) 699 return (ifa); 700 } else { 701 /* 702 * if we have a special address handler, 703 * then use it instead of the generic one. 704 */ 705 if (ifa->ifa_claim_addr) { 706 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 707 return (ifa); 708 } else { 709 continue; 710 } 711 } 712 713 /* 714 * Scan all the bits in the ifa's address. 715 * If a bit dissagrees with what we are 716 * looking for, mask it with the netmask 717 * to see if it really matters. 718 * (A byte at a time) 719 */ 720 if (ifa->ifa_netmask == 0) 721 continue; 722 cp = addr_data; 723 cp2 = ifa->ifa_addr->sa_data; 724 cp3 = ifa->ifa_netmask->sa_data; 725 cplim = ifa->ifa_netmask->sa_len 726 + (char *)ifa->ifa_netmask; 727 while (cp3 < cplim) 728 if ((*cp++ ^ *cp2++) & *cp3++) 729 goto next; /* next address! */ 730 /* 731 * If the netmask of what we just found 732 * is more specific than what we had before 733 * (if we had one) then remember the new one 734 * before continuing to search 735 * for an even better one. 736 */ 737 if (ifa_maybe == 0 || 738 rn_refines((char *)ifa->ifa_netmask, 739 (char *)ifa_maybe->ifa_netmask)) 740 ifa_maybe = ifa; 741 } 742 } 743 } 744 return (ifa_maybe); 745 } 746 747 /* 748 * Find an interface address specific to an interface best matching 749 * a given address. 750 */ 751 struct ifaddr * 752 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 753 { 754 struct ifaddr *ifa; 755 char *cp, *cp2, *cp3; 756 char *cplim; 757 struct ifaddr *ifa_maybe = 0; 758 u_int af = addr->sa_family; 759 760 if (af >= AF_MAX) 761 return (0); 762 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 763 if (ifa->ifa_addr->sa_family != af) 764 continue; 765 if (ifa_maybe == 0) 766 ifa_maybe = ifa; 767 if (ifa->ifa_netmask == NULL) { 768 if (sa_equal(addr, ifa->ifa_addr) || 769 (ifa->ifa_dstaddr != NULL && 770 sa_equal(addr, ifa->ifa_dstaddr))) 771 return (ifa); 772 continue; 773 } 774 if (ifp->if_flags & IFF_POINTOPOINT) { 775 if (sa_equal(addr, ifa->ifa_dstaddr)) 776 return (ifa); 777 } else { 778 cp = addr->sa_data; 779 cp2 = ifa->ifa_addr->sa_data; 780 cp3 = ifa->ifa_netmask->sa_data; 781 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 782 for (; cp3 < cplim; cp3++) 783 if ((*cp++ ^ *cp2++) & *cp3) 784 break; 785 if (cp3 == cplim) 786 return (ifa); 787 } 788 } 789 return (ifa_maybe); 790 } 791 792 #include <net/route.h> 793 794 /* 795 * Default action when installing a route with a Link Level gateway. 796 * Lookup an appropriate real ifa to point to. 797 * This should be moved to /sys/net/link.c eventually. 798 */ 799 static void 800 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 801 { 802 struct ifaddr *ifa; 803 struct sockaddr *dst; 804 struct ifnet *ifp; 805 806 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL || 807 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL) 808 return; 809 ifa = ifaof_ifpforaddr(dst, ifp); 810 if (ifa != NULL) { 811 IFAFREE(rt->rt_ifa); 812 IFAREF(ifa); 813 rt->rt_ifa = ifa; 814 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 815 ifa->ifa_rtrequest(cmd, rt, info); 816 } 817 } 818 819 /* 820 * Mark an interface down and notify protocols of 821 * the transition. 822 * NOTE: must be called at splnet or eqivalent. 823 */ 824 void 825 if_unroute(struct ifnet *ifp, int flag, int fam) 826 { 827 struct ifaddr *ifa; 828 829 ifp->if_flags &= ~flag; 830 getmicrotime(&ifp->if_lastchange); 831 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 832 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 833 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 834 if_qflush(&ifp->if_snd); 835 rt_ifmsg(ifp); 836 } 837 838 /* 839 * Mark an interface up and notify protocols of 840 * the transition. 841 * NOTE: must be called at splnet or eqivalent. 842 */ 843 void 844 if_route(struct ifnet *ifp, int flag, int fam) 845 { 846 struct ifaddr *ifa; 847 848 ifp->if_flags |= flag; 849 getmicrotime(&ifp->if_lastchange); 850 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 851 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 852 pfctlinput(PRC_IFUP, ifa->ifa_addr); 853 rt_ifmsg(ifp); 854 #ifdef INET6 855 in6_if_up(ifp); 856 #endif 857 } 858 859 /* 860 * Mark an interface down and notify protocols of 861 * the transition. 862 * NOTE: must be called at splnet or eqivalent. 863 */ 864 void 865 if_down(struct ifnet *ifp) 866 { 867 868 if_unroute(ifp, IFF_UP, AF_UNSPEC); 869 } 870 871 /* 872 * Mark an interface up and notify protocols of 873 * the transition. 874 * NOTE: must be called at splnet or eqivalent. 875 */ 876 void 877 if_up(struct ifnet *ifp) 878 { 879 880 if_route(ifp, IFF_UP, AF_UNSPEC); 881 } 882 883 /* 884 * Flush an interface queue. 885 */ 886 static void 887 if_qflush(struct ifqueue *ifq) 888 { 889 struct mbuf *m, *n; 890 891 n = ifq->ifq_head; 892 while ((m = n) != 0) { 893 n = m->m_nextpkt; 894 m_freem(m); 895 } 896 ifq->ifq_head = 0; 897 ifq->ifq_tail = 0; 898 ifq->ifq_len = 0; 899 } 900 901 /* 902 * Handle interface watchdog timer routines. Called 903 * from softclock, we decrement timers (if set) and 904 * call the appropriate interface routine on expiration. 905 */ 906 static void 907 if_slowtimo(void *arg) 908 { 909 struct ifnet *ifp; 910 int s = splimp(); 911 912 TAILQ_FOREACH(ifp, &ifnet, if_link) { 913 if (ifp->if_timer == 0 || --ifp->if_timer) 914 continue; 915 if (ifp->if_watchdog) 916 (*ifp->if_watchdog)(ifp); 917 } 918 splx(s); 919 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 920 } 921 922 /* 923 * Map interface name to 924 * interface structure pointer. 925 */ 926 struct ifnet * 927 ifunit(const char *name) 928 { 929 struct ifnet *ifp; 930 931 /* 932 * Search all the interfaces for this name/number 933 */ 934 935 TAILQ_FOREACH(ifp, &ifnet, if_link) { 936 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0) 937 break; 938 } 939 return (ifp); 940 } 941 942 943 /* 944 * Map interface name in a sockaddr_dl to 945 * interface structure pointer. 946 */ 947 struct ifnet * 948 if_withname(struct sockaddr *sa) 949 { 950 char ifname[IFNAMSIZ+1]; 951 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 952 953 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 954 (sdl->sdl_nlen > IFNAMSIZ) ) 955 return NULL; 956 957 /* 958 * ifunit wants a null-terminated name. It may not be null-terminated 959 * in the sockaddr. We don't want to change the caller's sockaddr, 960 * and there might not be room to put the trailing null anyway, so we 961 * make a local copy that we know we can null terminate safely. 962 */ 963 964 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 965 ifname[sdl->sdl_nlen] = '\0'; 966 return ifunit(ifname); 967 } 968 969 970 /* 971 * Interface ioctls. 972 */ 973 int 974 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 975 { 976 struct ifnet *ifp; 977 struct ifreq *ifr; 978 struct ifstat *ifs; 979 int error; 980 short oif_flags; 981 int new_flags; 982 size_t namelen, onamelen; 983 char new_name[IFNAMSIZ]; 984 struct ifaddr *ifa; 985 struct sockaddr_dl *sdl; 986 987 switch (cmd) { 988 989 case SIOCGIFCONF: 990 case OSIOCGIFCONF: 991 return (ifconf(cmd, data, td)); 992 } 993 ifr = (struct ifreq *)data; 994 995 switch (cmd) { 996 case SIOCIFCREATE: 997 case SIOCIFDESTROY: 998 if ((error = suser(td)) != 0) 999 return (error); 1000 return ((cmd == SIOCIFCREATE) ? 1001 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1002 if_clone_destroy(ifr->ifr_name)); 1003 1004 case SIOCIFGCLONERS: 1005 return (if_clone_list((struct if_clonereq *)data)); 1006 } 1007 1008 ifp = ifunit(ifr->ifr_name); 1009 if (ifp == 0) 1010 return (ENXIO); 1011 switch (cmd) { 1012 1013 case SIOCGIFFLAGS: 1014 ifr->ifr_flags = ifp->if_flags; 1015 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1016 break; 1017 1018 case SIOCGIFCAP: 1019 ifr->ifr_reqcap = ifp->if_capabilities; 1020 ifr->ifr_curcap = ifp->if_capenable; 1021 break; 1022 1023 case SIOCGIFMETRIC: 1024 ifr->ifr_metric = ifp->if_metric; 1025 break; 1026 1027 case SIOCGIFMTU: 1028 ifr->ifr_mtu = ifp->if_mtu; 1029 break; 1030 1031 case SIOCGIFPHYS: 1032 ifr->ifr_phys = ifp->if_physical; 1033 break; 1034 1035 case SIOCSIFFLAGS: 1036 error = suser(td); 1037 if (error) 1038 return (error); 1039 new_flags = (ifr->ifr_flags & 0xffff) | 1040 (ifr->ifr_flagshigh << 16); 1041 if (ifp->if_flags & IFF_SMART) { 1042 /* Smart drivers twiddle their own routes */ 1043 } else if (ifp->if_flags & IFF_UP && 1044 (new_flags & IFF_UP) == 0) { 1045 int s = splimp(); 1046 if_down(ifp); 1047 splx(s); 1048 } else if (new_flags & IFF_UP && 1049 (ifp->if_flags & IFF_UP) == 0) { 1050 int s = splimp(); 1051 if_up(ifp); 1052 splx(s); 1053 } 1054 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1055 (new_flags &~ IFF_CANTCHANGE); 1056 if (new_flags & IFF_PPROMISC) { 1057 /* Permanently promiscuous mode requested */ 1058 ifp->if_flags |= IFF_PROMISC; 1059 } else if (ifp->if_pcount == 0) { 1060 ifp->if_flags &= ~IFF_PROMISC; 1061 } 1062 if (ifp->if_ioctl) 1063 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1064 getmicrotime(&ifp->if_lastchange); 1065 break; 1066 1067 case SIOCSIFCAP: 1068 error = suser(td); 1069 if (error) 1070 return (error); 1071 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1072 return (EINVAL); 1073 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1074 break; 1075 1076 case SIOCSIFNAME: 1077 error = suser(td); 1078 if (error != 0) 1079 return (error); 1080 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1081 if (error != 0) 1082 return (error); 1083 if (new_name[0] == '\0') 1084 return (EINVAL); 1085 if (ifunit(new_name) != NULL) 1086 return (EEXIST); 1087 1088 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 1089 1090 /* Announce the departure of the interface. */ 1091 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1092 1093 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1094 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1095 /* XXX IFA_LOCK(ifa); */ 1096 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1097 namelen = strlen(new_name); 1098 onamelen = sdl->sdl_nlen; 1099 /* 1100 * Move the address if needed. This is safe because we 1101 * allocate space for a name of length IFNAMSIZ when we 1102 * create this in if_attach(). 1103 */ 1104 if (namelen != onamelen) { 1105 bcopy(sdl->sdl_data + onamelen, 1106 sdl->sdl_data + namelen, sdl->sdl_alen); 1107 } 1108 bcopy(new_name, sdl->sdl_data, namelen); 1109 sdl->sdl_nlen = namelen; 1110 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1111 bzero(sdl->sdl_data, onamelen); 1112 while (namelen != 0) 1113 sdl->sdl_data[--namelen] = 0xff; 1114 /* XXX IFA_UNLOCK(ifa) */ 1115 1116 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 1117 1118 /* Announce the return of the interface. */ 1119 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1120 break; 1121 1122 case SIOCSIFMETRIC: 1123 error = suser(td); 1124 if (error) 1125 return (error); 1126 ifp->if_metric = ifr->ifr_metric; 1127 getmicrotime(&ifp->if_lastchange); 1128 break; 1129 1130 case SIOCSIFPHYS: 1131 error = suser(td); 1132 if (error) 1133 return error; 1134 if (!ifp->if_ioctl) 1135 return EOPNOTSUPP; 1136 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1137 if (error == 0) 1138 getmicrotime(&ifp->if_lastchange); 1139 return (error); 1140 1141 case SIOCSIFMTU: 1142 { 1143 u_long oldmtu = ifp->if_mtu; 1144 1145 error = suser(td); 1146 if (error) 1147 return (error); 1148 if (ifp->if_ioctl == NULL) 1149 return (EOPNOTSUPP); 1150 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1151 return (EINVAL); 1152 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1153 if (error == 0) { 1154 getmicrotime(&ifp->if_lastchange); 1155 rt_ifmsg(ifp); 1156 } 1157 /* 1158 * If the link MTU changed, do network layer specific procedure. 1159 */ 1160 if (ifp->if_mtu != oldmtu) { 1161 #ifdef INET6 1162 nd6_setmtu(ifp); 1163 #endif 1164 } 1165 return (error); 1166 } 1167 1168 case SIOCADDMULTI: 1169 case SIOCDELMULTI: 1170 error = suser(td); 1171 if (error) 1172 return (error); 1173 1174 /* Don't allow group membership on non-multicast interfaces. */ 1175 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1176 return EOPNOTSUPP; 1177 1178 /* Don't let users screw up protocols' entries. */ 1179 if (ifr->ifr_addr.sa_family != AF_LINK) 1180 return EINVAL; 1181 1182 if (cmd == SIOCADDMULTI) { 1183 struct ifmultiaddr *ifma; 1184 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1185 } else { 1186 error = if_delmulti(ifp, &ifr->ifr_addr); 1187 } 1188 if (error == 0) 1189 getmicrotime(&ifp->if_lastchange); 1190 return error; 1191 1192 case SIOCSIFPHYADDR: 1193 case SIOCDIFPHYADDR: 1194 #ifdef INET6 1195 case SIOCSIFPHYADDR_IN6: 1196 #endif 1197 case SIOCSLIFPHYADDR: 1198 case SIOCSIFMEDIA: 1199 case SIOCSIFGENERIC: 1200 error = suser(td); 1201 if (error) 1202 return (error); 1203 if (ifp->if_ioctl == 0) 1204 return (EOPNOTSUPP); 1205 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1206 if (error == 0) 1207 getmicrotime(&ifp->if_lastchange); 1208 return error; 1209 1210 case SIOCGIFSTATUS: 1211 ifs = (struct ifstat *)data; 1212 ifs->ascii[0] = '\0'; 1213 1214 case SIOCGIFPSRCADDR: 1215 case SIOCGIFPDSTADDR: 1216 case SIOCGLIFPHYADDR: 1217 case SIOCGIFMEDIA: 1218 case SIOCGIFGENERIC: 1219 if (ifp->if_ioctl == 0) 1220 return (EOPNOTSUPP); 1221 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred)); 1222 1223 case SIOCSIFLLADDR: 1224 error = suser(td); 1225 if (error) 1226 return (error); 1227 return if_setlladdr(ifp, 1228 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1229 1230 default: 1231 oif_flags = ifp->if_flags; 1232 if (so->so_proto == 0) 1233 return (EOPNOTSUPP); 1234 #ifndef COMPAT_43 1235 error = so_pru_control(so, cmd, data, ifp, td); 1236 #else 1237 { 1238 int ocmd = cmd; 1239 1240 switch (cmd) { 1241 1242 case SIOCSIFDSTADDR: 1243 case SIOCSIFADDR: 1244 case SIOCSIFBRDADDR: 1245 case SIOCSIFNETMASK: 1246 #if BYTE_ORDER != BIG_ENDIAN 1247 if (ifr->ifr_addr.sa_family == 0 && 1248 ifr->ifr_addr.sa_len < 16) { 1249 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1250 ifr->ifr_addr.sa_len = 16; 1251 } 1252 #else 1253 if (ifr->ifr_addr.sa_len == 0) 1254 ifr->ifr_addr.sa_len = 16; 1255 #endif 1256 break; 1257 1258 case OSIOCGIFADDR: 1259 cmd = SIOCGIFADDR; 1260 break; 1261 1262 case OSIOCGIFDSTADDR: 1263 cmd = SIOCGIFDSTADDR; 1264 break; 1265 1266 case OSIOCGIFBRDADDR: 1267 cmd = SIOCGIFBRDADDR; 1268 break; 1269 1270 case OSIOCGIFNETMASK: 1271 cmd = SIOCGIFNETMASK; 1272 } 1273 error = so_pru_control(so, cmd, data, ifp, td); 1274 switch (ocmd) { 1275 1276 case OSIOCGIFADDR: 1277 case OSIOCGIFDSTADDR: 1278 case OSIOCGIFBRDADDR: 1279 case OSIOCGIFNETMASK: 1280 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1281 1282 } 1283 } 1284 #endif /* COMPAT_43 */ 1285 1286 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1287 #ifdef INET6 1288 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1289 if (ifp->if_flags & IFF_UP) { 1290 int s = splimp(); 1291 in6_if_up(ifp); 1292 splx(s); 1293 } 1294 #endif 1295 } 1296 return (error); 1297 1298 } 1299 return (0); 1300 } 1301 1302 /* 1303 * Set/clear promiscuous mode on interface ifp based on the truth value 1304 * of pswitch. The calls are reference counted so that only the first 1305 * "on" request actually has an effect, as does the final "off" request. 1306 * Results are undefined if the "off" and "on" requests are not matched. 1307 */ 1308 int 1309 ifpromisc(struct ifnet *ifp, int pswitch) 1310 { 1311 struct ifreq ifr; 1312 int error; 1313 int oldflags; 1314 1315 oldflags = ifp->if_flags; 1316 if (ifp->if_flags & IFF_PPROMISC) { 1317 /* Do nothing if device is in permanently promiscuous mode */ 1318 ifp->if_pcount += pswitch ? 1 : -1; 1319 return (0); 1320 } 1321 if (pswitch) { 1322 /* 1323 * If the device is not configured up, we cannot put it in 1324 * promiscuous mode. 1325 */ 1326 if ((ifp->if_flags & IFF_UP) == 0) 1327 return (ENETDOWN); 1328 if (ifp->if_pcount++ != 0) 1329 return (0); 1330 ifp->if_flags |= IFF_PROMISC; 1331 log(LOG_INFO, "%s: promiscuous mode enabled\n", 1332 ifp->if_xname); 1333 } else { 1334 if (--ifp->if_pcount > 0) 1335 return (0); 1336 ifp->if_flags &= ~IFF_PROMISC; 1337 log(LOG_INFO, "%s: promiscuous mode disabled\n", 1338 ifp->if_xname); 1339 } 1340 ifr.ifr_flags = ifp->if_flags; 1341 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1342 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1343 (struct ucred *)NULL); 1344 if (error == 0) 1345 rt_ifmsg(ifp); 1346 else 1347 ifp->if_flags = oldflags; 1348 return error; 1349 } 1350 1351 /* 1352 * Return interface configuration 1353 * of system. List may be used 1354 * in later ioctl's (above) to get 1355 * other information. 1356 */ 1357 static int 1358 ifconf(u_long cmd, caddr_t data, struct thread *td) 1359 { 1360 struct ifconf *ifc = (struct ifconf *)data; 1361 struct ifnet *ifp; 1362 struct ifaddr *ifa; 1363 struct sockaddr *sa; 1364 struct ifreq ifr, *ifrp; 1365 int space = ifc->ifc_len, error = 0; 1366 1367 ifrp = ifc->ifc_req; 1368 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1369 int addrs; 1370 1371 if (space <= sizeof ifr) 1372 break; 1373 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1374 >= sizeof(ifr.ifr_name)) { 1375 error = ENAMETOOLONG; 1376 break; 1377 } 1378 1379 addrs = 0; 1380 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1381 if (space <= sizeof ifr) 1382 break; 1383 sa = ifa->ifa_addr; 1384 if (td->td_proc->p_ucred->cr_prison && 1385 prison_if(td, sa)) 1386 continue; 1387 addrs++; 1388 #ifdef COMPAT_43 1389 if (cmd == OSIOCGIFCONF) { 1390 struct osockaddr *osa = 1391 (struct osockaddr *)&ifr.ifr_addr; 1392 ifr.ifr_addr = *sa; 1393 osa->sa_family = sa->sa_family; 1394 error = copyout(&ifr, ifrp, sizeof ifr); 1395 ifrp++; 1396 } else 1397 #endif 1398 if (sa->sa_len <= sizeof(*sa)) { 1399 ifr.ifr_addr = *sa; 1400 error = copyout(&ifr, ifrp, sizeof ifr); 1401 ifrp++; 1402 } else { 1403 if (space < (sizeof ifr) + sa->sa_len - 1404 sizeof(*sa)) 1405 break; 1406 space -= sa->sa_len - sizeof(*sa); 1407 error = copyout(&ifr, ifrp, 1408 sizeof ifr.ifr_name); 1409 if (error == 0) 1410 error = copyout(sa, &ifrp->ifr_addr, 1411 sa->sa_len); 1412 ifrp = (struct ifreq *) 1413 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1414 } 1415 if (error) 1416 break; 1417 space -= sizeof ifr; 1418 } 1419 if (error) 1420 break; 1421 if (!addrs) { 1422 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr); 1423 error = copyout(&ifr, ifrp, sizeof ifr); 1424 if (error) 1425 break; 1426 space -= sizeof ifr; 1427 ifrp++; 1428 } 1429 } 1430 ifc->ifc_len -= space; 1431 return (error); 1432 } 1433 1434 /* 1435 * Just like if_promisc(), but for all-multicast-reception mode. 1436 */ 1437 int 1438 if_allmulti(struct ifnet *ifp, int onswitch) 1439 { 1440 int error = 0; 1441 int s = splimp(); 1442 struct ifreq ifr; 1443 1444 if (onswitch) { 1445 if (ifp->if_amcount++ == 0) { 1446 ifp->if_flags |= IFF_ALLMULTI; 1447 ifr.ifr_flags = ifp->if_flags; 1448 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1449 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1450 (struct ucred *)NULL); 1451 } 1452 } else { 1453 if (ifp->if_amcount > 1) { 1454 ifp->if_amcount--; 1455 } else { 1456 ifp->if_amcount = 0; 1457 ifp->if_flags &= ~IFF_ALLMULTI; 1458 ifr.ifr_flags = ifp->if_flags; 1459 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1460 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1461 (struct ucred *)NULL); 1462 } 1463 } 1464 splx(s); 1465 1466 if (error == 0) 1467 rt_ifmsg(ifp); 1468 return error; 1469 } 1470 1471 /* 1472 * Add a multicast listenership to the interface in question. 1473 * The link layer provides a routine which converts 1474 */ 1475 int 1476 if_addmulti( 1477 struct ifnet *ifp, /* interface to manipulate */ 1478 struct sockaddr *sa, /* address to add */ 1479 struct ifmultiaddr **retifma) 1480 { 1481 struct sockaddr *llsa, *dupsa; 1482 int error, s; 1483 struct ifmultiaddr *ifma; 1484 1485 /* 1486 * If the matching multicast address already exists 1487 * then don't add a new one, just add a reference 1488 */ 1489 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1490 if (sa_equal(sa, ifma->ifma_addr)) { 1491 ifma->ifma_refcount++; 1492 if (retifma) 1493 *retifma = ifma; 1494 return 0; 1495 } 1496 } 1497 1498 /* 1499 * Give the link layer a chance to accept/reject it, and also 1500 * find out which AF_LINK address this maps to, if it isn't one 1501 * already. 1502 */ 1503 if (ifp->if_resolvemulti) { 1504 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1505 if (error) return error; 1506 } else { 1507 llsa = 0; 1508 } 1509 1510 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1511 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1512 bcopy(sa, dupsa, sa->sa_len); 1513 1514 ifma->ifma_addr = dupsa; 1515 ifma->ifma_lladdr = llsa; 1516 ifma->ifma_ifp = ifp; 1517 ifma->ifma_refcount = 1; 1518 ifma->ifma_protospec = 0; 1519 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1520 1521 /* 1522 * Some network interfaces can scan the address list at 1523 * interrupt time; lock them out. 1524 */ 1525 s = splimp(); 1526 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1527 splx(s); 1528 *retifma = ifma; 1529 1530 if (llsa != 0) { 1531 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1532 if (sa_equal(ifma->ifma_addr, llsa)) 1533 break; 1534 } 1535 if (ifma) { 1536 ifma->ifma_refcount++; 1537 } else { 1538 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1539 M_IFMADDR, M_WAITOK); 1540 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1541 M_IFMADDR, M_WAITOK); 1542 bcopy(llsa, dupsa, llsa->sa_len); 1543 ifma->ifma_addr = dupsa; 1544 ifma->ifma_ifp = ifp; 1545 ifma->ifma_refcount = 1; 1546 s = splimp(); 1547 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1548 splx(s); 1549 } 1550 } 1551 /* 1552 * We are certain we have added something, so call down to the 1553 * interface to let them know about it. 1554 */ 1555 s = splimp(); 1556 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL); 1557 splx(s); 1558 1559 return 0; 1560 } 1561 1562 /* 1563 * Remove a reference to a multicast address on this interface. Yell 1564 * if the request does not match an existing membership. 1565 */ 1566 int 1567 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1568 { 1569 struct ifmultiaddr *ifma; 1570 int s; 1571 1572 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1573 if (sa_equal(sa, ifma->ifma_addr)) 1574 break; 1575 if (ifma == 0) 1576 return ENOENT; 1577 1578 if (ifma->ifma_refcount > 1) { 1579 ifma->ifma_refcount--; 1580 return 0; 1581 } 1582 1583 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1584 sa = ifma->ifma_lladdr; 1585 s = splimp(); 1586 LIST_REMOVE(ifma, ifma_link); 1587 /* 1588 * Make sure the interface driver is notified 1589 * in the case of a link layer mcast group being left. 1590 */ 1591 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1592 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL); 1593 splx(s); 1594 free(ifma->ifma_addr, M_IFMADDR); 1595 free(ifma, M_IFMADDR); 1596 if (sa == 0) 1597 return 0; 1598 1599 /* 1600 * Now look for the link-layer address which corresponds to 1601 * this network address. It had been squirreled away in 1602 * ifma->ifma_lladdr for this purpose (so we don't have 1603 * to call ifp->if_resolvemulti() again), and we saved that 1604 * value in sa above. If some nasty deleted the 1605 * link-layer address out from underneath us, we can deal because 1606 * the address we stored was is not the same as the one which was 1607 * in the record for the link-layer address. (So we don't complain 1608 * in that case.) 1609 */ 1610 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1611 if (sa_equal(sa, ifma->ifma_addr)) 1612 break; 1613 if (ifma == 0) 1614 return 0; 1615 1616 if (ifma->ifma_refcount > 1) { 1617 ifma->ifma_refcount--; 1618 return 0; 1619 } 1620 1621 s = splimp(); 1622 LIST_REMOVE(ifma, ifma_link); 1623 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL); 1624 splx(s); 1625 free(ifma->ifma_addr, M_IFMADDR); 1626 free(sa, M_IFMADDR); 1627 free(ifma, M_IFMADDR); 1628 1629 return 0; 1630 } 1631 1632 /* 1633 * Set the link layer address on an interface. 1634 * 1635 * At this time we only support certain types of interfaces, 1636 * and we don't allow the length of the address to change. 1637 */ 1638 int 1639 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1640 { 1641 struct sockaddr_dl *sdl; 1642 struct ifaddr *ifa; 1643 struct ifreq ifr; 1644 1645 ifa = ifnet_addrs[ifp->if_index - 1]; 1646 if (ifa == NULL) 1647 return (EINVAL); 1648 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1649 if (sdl == NULL) 1650 return (EINVAL); 1651 if (len != sdl->sdl_alen) /* don't allow length to change */ 1652 return (EINVAL); 1653 switch (ifp->if_type) { 1654 case IFT_ETHER: /* these types use struct arpcom */ 1655 case IFT_FDDI: 1656 case IFT_XETHER: 1657 case IFT_ISO88025: 1658 case IFT_L2VLAN: 1659 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1660 /* FALLTHROUGH */ 1661 case IFT_ARCNET: 1662 bcopy(lladdr, LLADDR(sdl), len); 1663 break; 1664 default: 1665 return (ENODEV); 1666 } 1667 /* 1668 * If the interface is already up, we need 1669 * to re-init it in order to reprogram its 1670 * address filter. 1671 */ 1672 if ((ifp->if_flags & IFF_UP) != 0) { 1673 ifp->if_flags &= ~IFF_UP; 1674 ifr.ifr_flags = ifp->if_flags; 1675 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1676 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1677 (struct ucred *)NULL); 1678 ifp->if_flags |= IFF_UP; 1679 ifr.ifr_flags = ifp->if_flags; 1680 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1681 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1682 (struct ucred *)NULL); 1683 #ifdef INET 1684 /* 1685 * Also send gratuitous ARPs to notify other nodes about 1686 * the address change. 1687 */ 1688 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1689 if (ifa->ifa_addr != NULL && 1690 ifa->ifa_addr->sa_family == AF_INET) 1691 arp_ifinit(ifp, ifa); 1692 } 1693 #endif 1694 } 1695 return (0); 1696 } 1697 1698 struct ifmultiaddr * 1699 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 1700 { 1701 struct ifmultiaddr *ifma; 1702 1703 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1704 if (sa_equal(ifma->ifma_addr, sa)) 1705 break; 1706 1707 return ifma; 1708 } 1709 1710 /* 1711 * The name argument must be a pointer to storage which will last as 1712 * long as the interface does. For physical devices, the result of 1713 * device_get_name(dev) is a good choice and for pseudo-devices a 1714 * static string works well. 1715 */ 1716 void 1717 if_initname(struct ifnet *ifp, const char *name, int unit) 1718 { 1719 ifp->if_dname = name; 1720 ifp->if_dunit = unit; 1721 if (unit != IF_DUNIT_NONE) 1722 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 1723 else 1724 strlcpy(ifp->if_xname, name, IFNAMSIZ); 1725 } 1726 1727 int 1728 if_printf(struct ifnet *ifp, const char *fmt, ...) 1729 { 1730 __va_list ap; 1731 int retval; 1732 1733 retval = printf("%s: ", ifp->if_xname); 1734 __va_start(ap, fmt); 1735 retval += vprintf(fmt, ap); 1736 __va_end(ap); 1737 return (retval); 1738 } 1739 1740 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1741 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 1742