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 1.23 2004/12/21 02:54:14 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 #define equal(a1, a2) \ 621 (bcmp((a1), (a2), ((struct sockaddr *)(a1))->sa_len) == 0) 622 623 TAILQ_FOREACH(ifp, &ifnet, if_link) 624 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 625 if (ifa->ifa_addr->sa_family != addr->sa_family) 626 continue; 627 if (equal(addr, ifa->ifa_addr)) 628 return (ifa); 629 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && 630 /* IP6 doesn't have broadcast */ 631 ifa->ifa_broadaddr->sa_len != 0 && 632 equal(ifa->ifa_broadaddr, addr)) 633 return (ifa); 634 } 635 return ((struct ifaddr *)0); 636 } 637 /* 638 * Locate the point to point interface with a given destination address. 639 */ 640 struct ifaddr * 641 ifa_ifwithdstaddr(struct sockaddr *addr) 642 { 643 struct ifnet *ifp; 644 struct ifaddr *ifa; 645 646 TAILQ_FOREACH(ifp, &ifnet, if_link) 647 if (ifp->if_flags & IFF_POINTOPOINT) 648 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 649 if (ifa->ifa_addr->sa_family != addr->sa_family) 650 continue; 651 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 652 return (ifa); 653 } 654 return ((struct ifaddr *)0); 655 } 656 657 /* 658 * Find an interface on a specific network. If many, choice 659 * is most specific found. 660 */ 661 struct ifaddr * 662 ifa_ifwithnet(struct sockaddr *addr) 663 { 664 struct ifnet *ifp; 665 struct ifaddr *ifa; 666 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 667 u_int af = addr->sa_family; 668 char *addr_data = addr->sa_data, *cplim; 669 670 /* 671 * AF_LINK addresses can be looked up directly by their index number, 672 * so do that if we can. 673 */ 674 if (af == AF_LINK) { 675 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 676 if (sdl->sdl_index && sdl->sdl_index <= if_index) 677 return (ifnet_addrs[sdl->sdl_index - 1]); 678 } 679 680 /* 681 * Scan though each interface, looking for ones that have 682 * addresses in this address family. 683 */ 684 TAILQ_FOREACH(ifp, &ifnet, if_link) { 685 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 686 char *cp, *cp2, *cp3; 687 688 if (ifa->ifa_addr->sa_family != af) 689 next: continue; 690 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 691 /* 692 * This is a bit broken as it doesn't 693 * take into account that the remote end may 694 * be a single node in the network we are 695 * looking for. 696 * The trouble is that we don't know the 697 * netmask for the remote end. 698 */ 699 if (ifa->ifa_dstaddr != 0 && 700 equal(addr, ifa->ifa_dstaddr)) 701 return (ifa); 702 } else { 703 /* 704 * if we have a special address handler, 705 * then use it instead of the generic one. 706 */ 707 if (ifa->ifa_claim_addr) { 708 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 709 return (ifa); 710 } else { 711 continue; 712 } 713 } 714 715 /* 716 * Scan all the bits in the ifa's address. 717 * If a bit dissagrees with what we are 718 * looking for, mask it with the netmask 719 * to see if it really matters. 720 * (A byte at a time) 721 */ 722 if (ifa->ifa_netmask == 0) 723 continue; 724 cp = addr_data; 725 cp2 = ifa->ifa_addr->sa_data; 726 cp3 = ifa->ifa_netmask->sa_data; 727 cplim = ifa->ifa_netmask->sa_len 728 + (char *)ifa->ifa_netmask; 729 while (cp3 < cplim) 730 if ((*cp++ ^ *cp2++) & *cp3++) 731 goto next; /* next address! */ 732 /* 733 * If the netmask of what we just found 734 * is more specific than what we had before 735 * (if we had one) then remember the new one 736 * before continuing to search 737 * for an even better one. 738 */ 739 if (ifa_maybe == 0 || 740 rn_refines((char *)ifa->ifa_netmask, 741 (char *)ifa_maybe->ifa_netmask)) 742 ifa_maybe = ifa; 743 } 744 } 745 } 746 return (ifa_maybe); 747 } 748 749 /* 750 * Find an interface address specific to an interface best matching 751 * a given address. 752 */ 753 struct ifaddr * 754 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 755 { 756 struct ifaddr *ifa; 757 char *cp, *cp2, *cp3; 758 char *cplim; 759 struct ifaddr *ifa_maybe = 0; 760 u_int af = addr->sa_family; 761 762 if (af >= AF_MAX) 763 return (0); 764 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 765 if (ifa->ifa_addr->sa_family != af) 766 continue; 767 if (ifa_maybe == 0) 768 ifa_maybe = ifa; 769 if (ifa->ifa_netmask == 0) { 770 if (equal(addr, ifa->ifa_addr) || 771 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 772 return (ifa); 773 continue; 774 } 775 if (ifp->if_flags & IFF_POINTOPOINT) { 776 if (equal(addr, ifa->ifa_dstaddr)) 777 return (ifa); 778 } else { 779 cp = addr->sa_data; 780 cp2 = ifa->ifa_addr->sa_data; 781 cp3 = ifa->ifa_netmask->sa_data; 782 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 783 for (; cp3 < cplim; cp3++) 784 if ((*cp++ ^ *cp2++) & *cp3) 785 break; 786 if (cp3 == cplim) 787 return (ifa); 788 } 789 } 790 return (ifa_maybe); 791 } 792 793 #include <net/route.h> 794 795 /* 796 * Default action when installing a route with a Link Level gateway. 797 * Lookup an appropriate real ifa to point to. 798 * This should be moved to /sys/net/link.c eventually. 799 */ 800 static void 801 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 802 { 803 struct ifaddr *ifa; 804 struct sockaddr *dst; 805 struct ifnet *ifp; 806 807 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL || 808 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL) 809 return; 810 ifa = ifaof_ifpforaddr(dst, ifp); 811 if (ifa != NULL) { 812 IFAFREE(rt->rt_ifa); 813 IFAREF(ifa); 814 rt->rt_ifa = ifa; 815 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 816 ifa->ifa_rtrequest(cmd, rt, info); 817 } 818 } 819 820 /* 821 * Mark an interface down and notify protocols of 822 * the transition. 823 * NOTE: must be called at splnet or eqivalent. 824 */ 825 void 826 if_unroute(struct ifnet *ifp, int flag, int fam) 827 { 828 struct ifaddr *ifa; 829 830 ifp->if_flags &= ~flag; 831 getmicrotime(&ifp->if_lastchange); 832 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 833 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 834 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 835 if_qflush(&ifp->if_snd); 836 rt_ifmsg(ifp); 837 } 838 839 /* 840 * Mark an interface up and notify protocols of 841 * the transition. 842 * NOTE: must be called at splnet or eqivalent. 843 */ 844 void 845 if_route(struct ifnet *ifp, int flag, int fam) 846 { 847 struct ifaddr *ifa; 848 849 ifp->if_flags |= flag; 850 getmicrotime(&ifp->if_lastchange); 851 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 852 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 853 pfctlinput(PRC_IFUP, ifa->ifa_addr); 854 rt_ifmsg(ifp); 855 #ifdef INET6 856 in6_if_up(ifp); 857 #endif 858 } 859 860 /* 861 * Mark an interface down and notify protocols of 862 * the transition. 863 * NOTE: must be called at splnet or eqivalent. 864 */ 865 void 866 if_down(struct ifnet *ifp) 867 { 868 869 if_unroute(ifp, IFF_UP, AF_UNSPEC); 870 } 871 872 /* 873 * Mark an interface up and notify protocols of 874 * the transition. 875 * NOTE: must be called at splnet or eqivalent. 876 */ 877 void 878 if_up(struct ifnet *ifp) 879 { 880 881 if_route(ifp, IFF_UP, AF_UNSPEC); 882 } 883 884 /* 885 * Flush an interface queue. 886 */ 887 static void 888 if_qflush(struct ifqueue *ifq) 889 { 890 struct mbuf *m, *n; 891 892 n = ifq->ifq_head; 893 while ((m = n) != 0) { 894 n = m->m_nextpkt; 895 m_freem(m); 896 } 897 ifq->ifq_head = 0; 898 ifq->ifq_tail = 0; 899 ifq->ifq_len = 0; 900 } 901 902 /* 903 * Handle interface watchdog timer routines. Called 904 * from softclock, we decrement timers (if set) and 905 * call the appropriate interface routine on expiration. 906 */ 907 static void 908 if_slowtimo(void *arg) 909 { 910 struct ifnet *ifp; 911 int s = splimp(); 912 913 TAILQ_FOREACH(ifp, &ifnet, if_link) { 914 if (ifp->if_timer == 0 || --ifp->if_timer) 915 continue; 916 if (ifp->if_watchdog) 917 (*ifp->if_watchdog)(ifp); 918 } 919 splx(s); 920 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 921 } 922 923 /* 924 * Map interface name to 925 * interface structure pointer. 926 */ 927 struct ifnet * 928 ifunit(const char *name) 929 { 930 struct ifnet *ifp; 931 932 /* 933 * Search all the interfaces for this name/number 934 */ 935 936 TAILQ_FOREACH(ifp, &ifnet, if_link) { 937 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0) 938 break; 939 } 940 return (ifp); 941 } 942 943 944 /* 945 * Map interface name in a sockaddr_dl to 946 * interface structure pointer. 947 */ 948 struct ifnet * 949 if_withname(struct sockaddr *sa) 950 { 951 char ifname[IFNAMSIZ+1]; 952 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 953 954 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 955 (sdl->sdl_nlen > IFNAMSIZ) ) 956 return NULL; 957 958 /* 959 * ifunit wants a null-terminated name. It may not be null-terminated 960 * in the sockaddr. We don't want to change the caller's sockaddr, 961 * and there might not be room to put the trailing null anyway, so we 962 * make a local copy that we know we can null terminate safely. 963 */ 964 965 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 966 ifname[sdl->sdl_nlen] = '\0'; 967 return ifunit(ifname); 968 } 969 970 971 /* 972 * Interface ioctls. 973 */ 974 int 975 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 976 { 977 struct ifnet *ifp; 978 struct ifreq *ifr; 979 struct ifstat *ifs; 980 int error; 981 short oif_flags; 982 int new_flags; 983 size_t namelen, onamelen; 984 char new_name[IFNAMSIZ]; 985 struct ifaddr *ifa; 986 struct sockaddr_dl *sdl; 987 988 switch (cmd) { 989 990 case SIOCGIFCONF: 991 case OSIOCGIFCONF: 992 return (ifconf(cmd, data, td)); 993 } 994 ifr = (struct ifreq *)data; 995 996 switch (cmd) { 997 case SIOCIFCREATE: 998 case SIOCIFDESTROY: 999 if ((error = suser(td)) != 0) 1000 return (error); 1001 return ((cmd == SIOCIFCREATE) ? 1002 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1003 if_clone_destroy(ifr->ifr_name)); 1004 1005 case SIOCIFGCLONERS: 1006 return (if_clone_list((struct if_clonereq *)data)); 1007 } 1008 1009 ifp = ifunit(ifr->ifr_name); 1010 if (ifp == 0) 1011 return (ENXIO); 1012 switch (cmd) { 1013 1014 case SIOCGIFFLAGS: 1015 ifr->ifr_flags = ifp->if_flags; 1016 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1017 break; 1018 1019 case SIOCGIFCAP: 1020 ifr->ifr_reqcap = ifp->if_capabilities; 1021 ifr->ifr_curcap = ifp->if_capenable; 1022 break; 1023 1024 case SIOCGIFMETRIC: 1025 ifr->ifr_metric = ifp->if_metric; 1026 break; 1027 1028 case SIOCGIFMTU: 1029 ifr->ifr_mtu = ifp->if_mtu; 1030 break; 1031 1032 case SIOCGIFPHYS: 1033 ifr->ifr_phys = ifp->if_physical; 1034 break; 1035 1036 case SIOCSIFFLAGS: 1037 error = suser(td); 1038 if (error) 1039 return (error); 1040 new_flags = (ifr->ifr_flags & 0xffff) | 1041 (ifr->ifr_flagshigh << 16); 1042 if (ifp->if_flags & IFF_SMART) { 1043 /* Smart drivers twiddle their own routes */ 1044 } else if (ifp->if_flags & IFF_UP && 1045 (new_flags & IFF_UP) == 0) { 1046 int s = splimp(); 1047 if_down(ifp); 1048 splx(s); 1049 } else if (new_flags & IFF_UP && 1050 (ifp->if_flags & IFF_UP) == 0) { 1051 int s = splimp(); 1052 if_up(ifp); 1053 splx(s); 1054 } 1055 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1056 (new_flags &~ IFF_CANTCHANGE); 1057 if (new_flags & IFF_PPROMISC) { 1058 /* Permanently promiscuous mode requested */ 1059 ifp->if_flags |= IFF_PROMISC; 1060 } else if (ifp->if_pcount == 0) { 1061 ifp->if_flags &= ~IFF_PROMISC; 1062 } 1063 if (ifp->if_ioctl) 1064 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1065 getmicrotime(&ifp->if_lastchange); 1066 break; 1067 1068 case SIOCSIFCAP: 1069 error = suser(td); 1070 if (error) 1071 return (error); 1072 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1073 return (EINVAL); 1074 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1075 break; 1076 1077 case SIOCSIFNAME: 1078 error = suser(td); 1079 if (error != 0) 1080 return (error); 1081 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1082 if (error != 0) 1083 return (error); 1084 if (new_name[0] == '\0') 1085 return (EINVAL); 1086 if (ifunit(new_name) != NULL) 1087 return (EEXIST); 1088 1089 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 1090 1091 /* Announce the departure of the interface. */ 1092 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1093 1094 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1095 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1096 /* XXX IFA_LOCK(ifa); */ 1097 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1098 namelen = strlen(new_name); 1099 onamelen = sdl->sdl_nlen; 1100 /* 1101 * Move the address if needed. This is safe because we 1102 * allocate space for a name of length IFNAMSIZ when we 1103 * create this in if_attach(). 1104 */ 1105 if (namelen != onamelen) { 1106 bcopy(sdl->sdl_data + onamelen, 1107 sdl->sdl_data + namelen, sdl->sdl_alen); 1108 } 1109 bcopy(new_name, sdl->sdl_data, namelen); 1110 sdl->sdl_nlen = namelen; 1111 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1112 bzero(sdl->sdl_data, onamelen); 1113 while (namelen != 0) 1114 sdl->sdl_data[--namelen] = 0xff; 1115 /* XXX IFA_UNLOCK(ifa) */ 1116 1117 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 1118 1119 /* Announce the return of the interface. */ 1120 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1121 break; 1122 1123 case SIOCSIFMETRIC: 1124 error = suser(td); 1125 if (error) 1126 return (error); 1127 ifp->if_metric = ifr->ifr_metric; 1128 getmicrotime(&ifp->if_lastchange); 1129 break; 1130 1131 case SIOCSIFPHYS: 1132 error = suser(td); 1133 if (error) 1134 return error; 1135 if (!ifp->if_ioctl) 1136 return EOPNOTSUPP; 1137 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1138 if (error == 0) 1139 getmicrotime(&ifp->if_lastchange); 1140 return (error); 1141 1142 case SIOCSIFMTU: 1143 { 1144 u_long oldmtu = ifp->if_mtu; 1145 1146 error = suser(td); 1147 if (error) 1148 return (error); 1149 if (ifp->if_ioctl == NULL) 1150 return (EOPNOTSUPP); 1151 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1152 return (EINVAL); 1153 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1154 if (error == 0) { 1155 getmicrotime(&ifp->if_lastchange); 1156 rt_ifmsg(ifp); 1157 } 1158 /* 1159 * If the link MTU changed, do network layer specific procedure. 1160 */ 1161 if (ifp->if_mtu != oldmtu) { 1162 #ifdef INET6 1163 nd6_setmtu(ifp); 1164 #endif 1165 } 1166 return (error); 1167 } 1168 1169 case SIOCADDMULTI: 1170 case SIOCDELMULTI: 1171 error = suser(td); 1172 if (error) 1173 return (error); 1174 1175 /* Don't allow group membership on non-multicast interfaces. */ 1176 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1177 return EOPNOTSUPP; 1178 1179 /* Don't let users screw up protocols' entries. */ 1180 if (ifr->ifr_addr.sa_family != AF_LINK) 1181 return EINVAL; 1182 1183 if (cmd == SIOCADDMULTI) { 1184 struct ifmultiaddr *ifma; 1185 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1186 } else { 1187 error = if_delmulti(ifp, &ifr->ifr_addr); 1188 } 1189 if (error == 0) 1190 getmicrotime(&ifp->if_lastchange); 1191 return error; 1192 1193 case SIOCSIFPHYADDR: 1194 case SIOCDIFPHYADDR: 1195 #ifdef INET6 1196 case SIOCSIFPHYADDR_IN6: 1197 #endif 1198 case SIOCSLIFPHYADDR: 1199 case SIOCSIFMEDIA: 1200 case SIOCSIFGENERIC: 1201 error = suser(td); 1202 if (error) 1203 return (error); 1204 if (ifp->if_ioctl == 0) 1205 return (EOPNOTSUPP); 1206 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1207 if (error == 0) 1208 getmicrotime(&ifp->if_lastchange); 1209 return error; 1210 1211 case SIOCGIFSTATUS: 1212 ifs = (struct ifstat *)data; 1213 ifs->ascii[0] = '\0'; 1214 1215 case SIOCGIFPSRCADDR: 1216 case SIOCGIFPDSTADDR: 1217 case SIOCGLIFPHYADDR: 1218 case SIOCGIFMEDIA: 1219 case SIOCGIFGENERIC: 1220 if (ifp->if_ioctl == 0) 1221 return (EOPNOTSUPP); 1222 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred)); 1223 1224 case SIOCSIFLLADDR: 1225 error = suser(td); 1226 if (error) 1227 return (error); 1228 return if_setlladdr(ifp, 1229 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1230 1231 default: 1232 oif_flags = ifp->if_flags; 1233 if (so->so_proto == 0) 1234 return (EOPNOTSUPP); 1235 #ifndef COMPAT_43 1236 error = so_pru_control(so, cmd, data, ifp, td); 1237 #else 1238 { 1239 int ocmd = cmd; 1240 1241 switch (cmd) { 1242 1243 case SIOCSIFDSTADDR: 1244 case SIOCSIFADDR: 1245 case SIOCSIFBRDADDR: 1246 case SIOCSIFNETMASK: 1247 #if BYTE_ORDER != BIG_ENDIAN 1248 if (ifr->ifr_addr.sa_family == 0 && 1249 ifr->ifr_addr.sa_len < 16) { 1250 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1251 ifr->ifr_addr.sa_len = 16; 1252 } 1253 #else 1254 if (ifr->ifr_addr.sa_len == 0) 1255 ifr->ifr_addr.sa_len = 16; 1256 #endif 1257 break; 1258 1259 case OSIOCGIFADDR: 1260 cmd = SIOCGIFADDR; 1261 break; 1262 1263 case OSIOCGIFDSTADDR: 1264 cmd = SIOCGIFDSTADDR; 1265 break; 1266 1267 case OSIOCGIFBRDADDR: 1268 cmd = SIOCGIFBRDADDR; 1269 break; 1270 1271 case OSIOCGIFNETMASK: 1272 cmd = SIOCGIFNETMASK; 1273 } 1274 error = so_pru_control(so, cmd, data, ifp, td); 1275 switch (ocmd) { 1276 1277 case OSIOCGIFADDR: 1278 case OSIOCGIFDSTADDR: 1279 case OSIOCGIFBRDADDR: 1280 case OSIOCGIFNETMASK: 1281 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1282 1283 } 1284 } 1285 #endif /* COMPAT_43 */ 1286 1287 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1288 #ifdef INET6 1289 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1290 if (ifp->if_flags & IFF_UP) { 1291 int s = splimp(); 1292 in6_if_up(ifp); 1293 splx(s); 1294 } 1295 #endif 1296 } 1297 return (error); 1298 1299 } 1300 return (0); 1301 } 1302 1303 /* 1304 * Set/clear promiscuous mode on interface ifp based on the truth value 1305 * of pswitch. The calls are reference counted so that only the first 1306 * "on" request actually has an effect, as does the final "off" request. 1307 * Results are undefined if the "off" and "on" requests are not matched. 1308 */ 1309 int 1310 ifpromisc(struct ifnet *ifp, int pswitch) 1311 { 1312 struct ifreq ifr; 1313 int error; 1314 int oldflags; 1315 1316 oldflags = ifp->if_flags; 1317 if (ifp->if_flags & IFF_PPROMISC) { 1318 /* Do nothing if device is in permanently promiscuous mode */ 1319 ifp->if_pcount += pswitch ? 1 : -1; 1320 return (0); 1321 } 1322 if (pswitch) { 1323 /* 1324 * If the device is not configured up, we cannot put it in 1325 * promiscuous mode. 1326 */ 1327 if ((ifp->if_flags & IFF_UP) == 0) 1328 return (ENETDOWN); 1329 if (ifp->if_pcount++ != 0) 1330 return (0); 1331 ifp->if_flags |= IFF_PROMISC; 1332 log(LOG_INFO, "%s: promiscuous mode enabled\n", 1333 ifp->if_xname); 1334 } else { 1335 if (--ifp->if_pcount > 0) 1336 return (0); 1337 ifp->if_flags &= ~IFF_PROMISC; 1338 log(LOG_INFO, "%s: promiscuous mode disabled\n", 1339 ifp->if_xname); 1340 } 1341 ifr.ifr_flags = ifp->if_flags; 1342 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1343 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1344 (struct ucred *)NULL); 1345 if (error == 0) 1346 rt_ifmsg(ifp); 1347 else 1348 ifp->if_flags = oldflags; 1349 return error; 1350 } 1351 1352 /* 1353 * Return interface configuration 1354 * of system. List may be used 1355 * in later ioctl's (above) to get 1356 * other information. 1357 */ 1358 static int 1359 ifconf(u_long cmd, caddr_t data, struct thread *td) 1360 { 1361 struct ifconf *ifc = (struct ifconf *)data; 1362 struct ifnet *ifp; 1363 struct ifaddr *ifa; 1364 struct sockaddr *sa; 1365 struct ifreq ifr, *ifrp; 1366 int space = ifc->ifc_len, error = 0; 1367 1368 ifrp = ifc->ifc_req; 1369 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1370 int addrs; 1371 1372 if (space <= sizeof ifr) 1373 break; 1374 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1375 >= sizeof(ifr.ifr_name)) { 1376 error = ENAMETOOLONG; 1377 break; 1378 } 1379 1380 addrs = 0; 1381 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1382 if (space <= sizeof ifr) 1383 break; 1384 sa = ifa->ifa_addr; 1385 if (td->td_proc->p_ucred->cr_prison && 1386 prison_if(td, sa)) 1387 continue; 1388 addrs++; 1389 #ifdef COMPAT_43 1390 if (cmd == OSIOCGIFCONF) { 1391 struct osockaddr *osa = 1392 (struct osockaddr *)&ifr.ifr_addr; 1393 ifr.ifr_addr = *sa; 1394 osa->sa_family = sa->sa_family; 1395 error = copyout(&ifr, ifrp, sizeof ifr); 1396 ifrp++; 1397 } else 1398 #endif 1399 if (sa->sa_len <= sizeof(*sa)) { 1400 ifr.ifr_addr = *sa; 1401 error = copyout(&ifr, ifrp, sizeof ifr); 1402 ifrp++; 1403 } else { 1404 if (space < (sizeof ifr) + sa->sa_len - 1405 sizeof(*sa)) 1406 break; 1407 space -= sa->sa_len - sizeof(*sa); 1408 error = copyout(&ifr, ifrp, 1409 sizeof ifr.ifr_name); 1410 if (error == 0) 1411 error = copyout(sa, &ifrp->ifr_addr, 1412 sa->sa_len); 1413 ifrp = (struct ifreq *) 1414 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1415 } 1416 if (error) 1417 break; 1418 space -= sizeof ifr; 1419 } 1420 if (error) 1421 break; 1422 if (!addrs) { 1423 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr); 1424 error = copyout(&ifr, ifrp, sizeof ifr); 1425 if (error) 1426 break; 1427 space -= sizeof ifr; 1428 ifrp++; 1429 } 1430 } 1431 ifc->ifc_len -= space; 1432 return (error); 1433 } 1434 1435 /* 1436 * Just like if_promisc(), but for all-multicast-reception mode. 1437 */ 1438 int 1439 if_allmulti(struct ifnet *ifp, int onswitch) 1440 { 1441 int error = 0; 1442 int s = splimp(); 1443 struct ifreq ifr; 1444 1445 if (onswitch) { 1446 if (ifp->if_amcount++ == 0) { 1447 ifp->if_flags |= IFF_ALLMULTI; 1448 ifr.ifr_flags = ifp->if_flags; 1449 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1450 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1451 (struct ucred *)NULL); 1452 } 1453 } else { 1454 if (ifp->if_amcount > 1) { 1455 ifp->if_amcount--; 1456 } else { 1457 ifp->if_amcount = 0; 1458 ifp->if_flags &= ~IFF_ALLMULTI; 1459 ifr.ifr_flags = ifp->if_flags; 1460 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1461 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1462 (struct ucred *)NULL); 1463 } 1464 } 1465 splx(s); 1466 1467 if (error == 0) 1468 rt_ifmsg(ifp); 1469 return error; 1470 } 1471 1472 /* 1473 * Add a multicast listenership to the interface in question. 1474 * The link layer provides a routine which converts 1475 */ 1476 int 1477 if_addmulti( 1478 struct ifnet *ifp, /* interface to manipulate */ 1479 struct sockaddr *sa, /* address to add */ 1480 struct ifmultiaddr **retifma) 1481 { 1482 struct sockaddr *llsa, *dupsa; 1483 int error, s; 1484 struct ifmultiaddr *ifma; 1485 1486 /* 1487 * If the matching multicast address already exists 1488 * then don't add a new one, just add a reference 1489 */ 1490 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1491 if (equal(sa, ifma->ifma_addr)) { 1492 ifma->ifma_refcount++; 1493 if (retifma) 1494 *retifma = ifma; 1495 return 0; 1496 } 1497 } 1498 1499 /* 1500 * Give the link layer a chance to accept/reject it, and also 1501 * find out which AF_LINK address this maps to, if it isn't one 1502 * already. 1503 */ 1504 if (ifp->if_resolvemulti) { 1505 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1506 if (error) return error; 1507 } else { 1508 llsa = 0; 1509 } 1510 1511 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1512 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1513 bcopy(sa, dupsa, sa->sa_len); 1514 1515 ifma->ifma_addr = dupsa; 1516 ifma->ifma_lladdr = llsa; 1517 ifma->ifma_ifp = ifp; 1518 ifma->ifma_refcount = 1; 1519 ifma->ifma_protospec = 0; 1520 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1521 1522 /* 1523 * Some network interfaces can scan the address list at 1524 * interrupt time; lock them out. 1525 */ 1526 s = splimp(); 1527 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1528 splx(s); 1529 *retifma = ifma; 1530 1531 if (llsa != 0) { 1532 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1533 if (equal(ifma->ifma_addr, llsa)) 1534 break; 1535 } 1536 if (ifma) { 1537 ifma->ifma_refcount++; 1538 } else { 1539 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1540 M_IFMADDR, M_WAITOK); 1541 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1542 M_IFMADDR, M_WAITOK); 1543 bcopy(llsa, dupsa, llsa->sa_len); 1544 ifma->ifma_addr = dupsa; 1545 ifma->ifma_ifp = ifp; 1546 ifma->ifma_refcount = 1; 1547 s = splimp(); 1548 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1549 splx(s); 1550 } 1551 } 1552 /* 1553 * We are certain we have added something, so call down to the 1554 * interface to let them know about it. 1555 */ 1556 s = splimp(); 1557 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL); 1558 splx(s); 1559 1560 return 0; 1561 } 1562 1563 /* 1564 * Remove a reference to a multicast address on this interface. Yell 1565 * if the request does not match an existing membership. 1566 */ 1567 int 1568 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1569 { 1570 struct ifmultiaddr *ifma; 1571 int s; 1572 1573 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1574 if (equal(sa, ifma->ifma_addr)) 1575 break; 1576 if (ifma == 0) 1577 return ENOENT; 1578 1579 if (ifma->ifma_refcount > 1) { 1580 ifma->ifma_refcount--; 1581 return 0; 1582 } 1583 1584 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1585 sa = ifma->ifma_lladdr; 1586 s = splimp(); 1587 LIST_REMOVE(ifma, ifma_link); 1588 /* 1589 * Make sure the interface driver is notified 1590 * in the case of a link layer mcast group being left. 1591 */ 1592 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1593 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL); 1594 splx(s); 1595 free(ifma->ifma_addr, M_IFMADDR); 1596 free(ifma, M_IFMADDR); 1597 if (sa == 0) 1598 return 0; 1599 1600 /* 1601 * Now look for the link-layer address which corresponds to 1602 * this network address. It had been squirreled away in 1603 * ifma->ifma_lladdr for this purpose (so we don't have 1604 * to call ifp->if_resolvemulti() again), and we saved that 1605 * value in sa above. If some nasty deleted the 1606 * link-layer address out from underneath us, we can deal because 1607 * the address we stored was is not the same as the one which was 1608 * in the record for the link-layer address. (So we don't complain 1609 * in that case.) 1610 */ 1611 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1612 if (equal(sa, ifma->ifma_addr)) 1613 break; 1614 if (ifma == 0) 1615 return 0; 1616 1617 if (ifma->ifma_refcount > 1) { 1618 ifma->ifma_refcount--; 1619 return 0; 1620 } 1621 1622 s = splimp(); 1623 LIST_REMOVE(ifma, ifma_link); 1624 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL); 1625 splx(s); 1626 free(ifma->ifma_addr, M_IFMADDR); 1627 free(sa, M_IFMADDR); 1628 free(ifma, M_IFMADDR); 1629 1630 return 0; 1631 } 1632 1633 /* 1634 * Set the link layer address on an interface. 1635 * 1636 * At this time we only support certain types of interfaces, 1637 * and we don't allow the length of the address to change. 1638 */ 1639 int 1640 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1641 { 1642 struct sockaddr_dl *sdl; 1643 struct ifaddr *ifa; 1644 struct ifreq ifr; 1645 1646 ifa = ifnet_addrs[ifp->if_index - 1]; 1647 if (ifa == NULL) 1648 return (EINVAL); 1649 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1650 if (sdl == NULL) 1651 return (EINVAL); 1652 if (len != sdl->sdl_alen) /* don't allow length to change */ 1653 return (EINVAL); 1654 switch (ifp->if_type) { 1655 case IFT_ETHER: /* these types use struct arpcom */ 1656 case IFT_FDDI: 1657 case IFT_XETHER: 1658 case IFT_ISO88025: 1659 case IFT_L2VLAN: 1660 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1661 /* FALLTHROUGH */ 1662 case IFT_ARCNET: 1663 bcopy(lladdr, LLADDR(sdl), len); 1664 break; 1665 default: 1666 return (ENODEV); 1667 } 1668 /* 1669 * If the interface is already up, we need 1670 * to re-init it in order to reprogram its 1671 * address filter. 1672 */ 1673 if ((ifp->if_flags & IFF_UP) != 0) { 1674 ifp->if_flags &= ~IFF_UP; 1675 ifr.ifr_flags = ifp->if_flags; 1676 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1677 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1678 (struct ucred *)NULL); 1679 ifp->if_flags |= IFF_UP; 1680 ifr.ifr_flags = ifp->if_flags; 1681 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1682 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1683 (struct ucred *)NULL); 1684 #ifdef INET 1685 /* 1686 * Also send gratuitous ARPs to notify other nodes about 1687 * the address change. 1688 */ 1689 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1690 if (ifa->ifa_addr != NULL && 1691 ifa->ifa_addr->sa_family == AF_INET) 1692 arp_ifinit(ifp, ifa); 1693 } 1694 #endif 1695 } 1696 return (0); 1697 } 1698 1699 struct ifmultiaddr * 1700 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 1701 { 1702 struct ifmultiaddr *ifma; 1703 1704 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1705 if (equal(ifma->ifma_addr, sa)) 1706 break; 1707 1708 return ifma; 1709 } 1710 1711 /* 1712 * The name argument must be a pointer to storage which will last as 1713 * long as the interface does. For physical devices, the result of 1714 * device_get_name(dev) is a good choice and for pseudo-devices a 1715 * static string works well. 1716 */ 1717 void 1718 if_initname(struct ifnet *ifp, const char *name, int unit) 1719 { 1720 ifp->if_dname = name; 1721 ifp->if_dunit = unit; 1722 if (unit != IF_DUNIT_NONE) 1723 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 1724 else 1725 strlcpy(ifp->if_xname, name, IFNAMSIZ); 1726 } 1727 1728 int 1729 if_printf(struct ifnet *ifp, const char *fmt, ...) 1730 { 1731 __va_list ap; 1732 int retval; 1733 1734 retval = printf("%s: ", ifp->if_xname); 1735 __va_start(ap, fmt); 1736 retval += vprintf(fmt, ap); 1737 __va_end(ap); 1738 return (retval); 1739 } 1740 1741 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1742 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 1743