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 1.41 2005/10/24 08:06:16 sephe Exp $ 36 */ 37 38 #include "opt_compat.h" 39 #include "opt_inet6.h" 40 #include "opt_inet.h" 41 #include "opt_polling.h" 42 43 #include <sys/param.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/systm.h> 47 #include <sys/proc.h> 48 #include <sys/protosw.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/socketops.h> 52 #include <sys/protosw.h> 53 #include <sys/kernel.h> 54 #include <sys/sockio.h> 55 #include <sys/syslog.h> 56 #include <sys/sysctl.h> 57 #include <sys/domain.h> 58 #include <sys/thread.h> 59 60 #include <net/if.h> 61 #include <net/if_arp.h> 62 #include <net/if_dl.h> 63 #include <net/if_types.h> 64 #include <net/if_var.h> 65 #include <net/ifq_var.h> 66 #include <net/radix.h> 67 #include <net/route.h> 68 #include <machine/stdarg.h> 69 70 #include <sys/thread2.h> 71 72 #if defined(INET) || defined(INET6) 73 /*XXX*/ 74 #include <netinet/in.h> 75 #include <netinet/in_var.h> 76 #include <netinet/if_ether.h> 77 #ifdef INET6 78 #include <machine/clock.h> /* XXX: temporal workaround for fxp issue */ 79 #include <netinet6/in6_var.h> 80 #include <netinet6/in6_ifattach.h> 81 #endif 82 #endif 83 84 #if defined(COMPAT_43) 85 #include <emulation/43bsd/43bsd_socket.h> 86 #endif /* COMPAT_43 */ 87 88 /* 89 * Support for non-ALTQ interfaces. 90 */ 91 static int ifq_classic_enqueue(struct ifaltq *, struct mbuf *, 92 struct altq_pktattr *); 93 static struct mbuf * 94 ifq_classic_dequeue(struct ifaltq *, int); 95 static int ifq_classic_request(struct ifaltq *, int, void *); 96 97 /* 98 * System initialization 99 */ 100 101 static void if_attachdomain(void *); 102 static void if_attachdomain1(struct ifnet *); 103 static int ifconf (u_long, caddr_t, struct thread *); 104 static void ifinit (void *); 105 static void if_slowtimo (void *); 106 static void link_rtrequest (int, struct rtentry *, struct rt_addrinfo *); 107 static int if_rtdel (struct radix_node *, void *); 108 109 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL) 110 111 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 112 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 113 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework"); 114 115 int ifqmaxlen = IFQ_MAXLEN; 116 struct ifnethead ifnet; /* depend on static init XXX */ 117 118 #ifdef INET6 119 /* 120 * XXX: declare here to avoid to include many inet6 related files.. 121 * should be more generalized? 122 */ 123 extern void nd6_setmtu (struct ifnet *); 124 #endif 125 126 struct if_clone *if_clone_lookup (const char *, int *); 127 int if_clone_list (struct if_clonereq *); 128 129 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 130 int if_cloners_count; 131 132 struct callout if_slowtimo_timer; 133 134 /* 135 * Network interface utility routines. 136 * 137 * Routines with ifa_ifwith* names take sockaddr *'s as 138 * parameters. 139 */ 140 /* ARGSUSED*/ 141 void 142 ifinit(void *dummy) 143 { 144 struct ifnet *ifp; 145 146 callout_init(&if_slowtimo_timer); 147 148 crit_enter(); 149 TAILQ_FOREACH(ifp, &ifnet, if_link) { 150 if (ifp->if_snd.ifq_maxlen == 0) { 151 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 152 ifp->if_snd.ifq_maxlen = ifqmaxlen; 153 } 154 } 155 crit_exit(); 156 157 if_slowtimo(0); 158 } 159 160 int if_index = 0; 161 struct ifnet **ifindex2ifnet = NULL; 162 163 /* 164 * Attach an interface to the 165 * list of "active" interfaces. 166 */ 167 void 168 if_attach(struct ifnet *ifp) 169 { 170 unsigned socksize, ifasize; 171 int namelen, masklen; 172 struct sockaddr_dl *sdl; 173 struct ifaddr *ifa; 174 struct ifaltq *ifq; 175 176 static int if_indexlim = 8; 177 static boolean_t inited; 178 179 if (!inited) { 180 TAILQ_INIT(&ifnet); 181 inited = TRUE; 182 } 183 184 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 185 ifp->if_index = ++if_index; 186 /* 187 * XXX - 188 * The old code would work if the interface passed a pre-existing 189 * chain of ifaddrs to this code. We don't trust our callers to 190 * properly initialize the tailq, however, so we no longer allow 191 * this unlikely case. 192 */ 193 TAILQ_INIT(&ifp->if_addrhead); 194 TAILQ_INIT(&ifp->if_prefixhead); 195 LIST_INIT(&ifp->if_multiaddrs); 196 getmicrotime(&ifp->if_lastchange); 197 if (ifindex2ifnet == NULL || if_index >= if_indexlim) { 198 unsigned int n; 199 struct ifnet **q; 200 201 if_indexlim <<= 1; 202 203 /* grow ifindex2ifnet */ 204 n = if_indexlim * sizeof(*q); 205 q = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 206 if (ifindex2ifnet) { 207 bcopy(ifindex2ifnet, q, n/2); 208 free(ifindex2ifnet, M_IFADDR); 209 } 210 ifindex2ifnet = q; 211 } 212 213 ifindex2ifnet[if_index] = ifp; 214 215 /* 216 * create a Link Level name for this device 217 */ 218 namelen = strlen(ifp->if_xname); 219 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m)) 220 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen; 221 socksize = masklen + ifp->if_addrlen; 222 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1))) 223 if (socksize < sizeof(*sdl)) 224 socksize = sizeof(*sdl); 225 socksize = ROUNDUP(socksize); 226 ifasize = sizeof(struct ifaddr) + 2 * socksize; 227 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 228 sdl = (struct sockaddr_dl *)(ifa + 1); 229 sdl->sdl_len = socksize; 230 sdl->sdl_family = AF_LINK; 231 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 232 sdl->sdl_nlen = namelen; 233 sdl->sdl_index = ifp->if_index; 234 sdl->sdl_type = ifp->if_type; 235 ifp->if_lladdr = ifa; 236 ifa->ifa_ifp = ifp; 237 ifa->ifa_rtrequest = link_rtrequest; 238 ifa->ifa_addr = (struct sockaddr *)sdl; 239 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 240 ifa->ifa_netmask = (struct sockaddr *)sdl; 241 sdl->sdl_len = masklen; 242 while (namelen != 0) 243 sdl->sdl_data[--namelen] = 0xff; 244 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 245 246 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 247 248 ifq = &ifp->if_snd; 249 ifq->altq_type = 0; 250 ifq->altq_disc = NULL; 251 ifq->altq_flags &= ALTQF_CANTCHANGE; 252 ifq->altq_tbr = NULL; 253 ifq->altq_ifp = ifp; 254 ifq_set_classic(ifq); 255 256 if (!SLIST_EMPTY(&domains)) 257 if_attachdomain1(ifp); 258 259 /* Announce the interface. */ 260 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 261 } 262 263 static void 264 if_attachdomain(void *dummy) 265 { 266 struct ifnet *ifp; 267 268 crit_enter(); 269 TAILQ_FOREACH(ifp, &ifnet, if_list) 270 if_attachdomain1(ifp); 271 crit_exit(); 272 } 273 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 274 if_attachdomain, NULL); 275 276 static void 277 if_attachdomain1(struct ifnet *ifp) 278 { 279 struct domain *dp; 280 281 crit_enter(); 282 283 /* address family dependent data region */ 284 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 285 SLIST_FOREACH(dp, &domains, dom_next) 286 if (dp->dom_ifattach) 287 ifp->if_afdata[dp->dom_family] = 288 (*dp->dom_ifattach)(ifp); 289 crit_exit(); 290 } 291 292 /* 293 * Detach an interface, removing it from the 294 * list of "active" interfaces. 295 */ 296 void 297 if_detach(struct ifnet *ifp) 298 { 299 struct ifaddr *ifa; 300 struct radix_node_head *rnh; 301 int i; 302 struct domain *dp; 303 304 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 305 306 /* 307 * Remove routes and flush queues. 308 */ 309 crit_enter(); 310 #ifdef DEVICE_POLLING 311 if (ifp->if_flags & IFF_POLLING) 312 ether_poll_deregister(ifp); 313 #endif 314 if_down(ifp); 315 316 if (ifq_is_enabled(&ifp->if_snd)) 317 altq_disable(&ifp->if_snd); 318 if (ifq_is_attached(&ifp->if_snd)) 319 altq_detach(&ifp->if_snd); 320 321 /* 322 * Clean up all addresses. 323 */ 324 ifp->if_lladdr = NULL; 325 326 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 327 ifa = TAILQ_FIRST(&ifp->if_addrhead)) { 328 #ifdef INET 329 /* XXX: Ugly!! ad hoc just for INET */ 330 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 331 struct ifaliasreq ifr; 332 333 bzero(&ifr, sizeof ifr); 334 ifr.ifra_addr = *ifa->ifa_addr; 335 if (ifa->ifa_dstaddr) 336 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 337 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 338 NULL) == 0) 339 continue; 340 } 341 #endif /* INET */ 342 #ifdef INET6 343 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 344 in6_purgeaddr(ifa); 345 /* ifp_addrhead is already updated */ 346 continue; 347 } 348 #endif /* INET6 */ 349 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 350 IFAFREE(ifa); 351 } 352 353 #ifdef INET 354 /* 355 * Remove all IPv4 kernel structures related to ifp. 356 */ 357 in_ifdetach(ifp); 358 #endif 359 360 #ifdef INET6 361 /* 362 * Remove all IPv6 kernel structs related to ifp. This should be done 363 * before removing routing entries below, since IPv6 interface direct 364 * routes are expected to be removed by the IPv6-specific kernel API. 365 * Otherwise, the kernel will detect some inconsistency and bark it. 366 */ 367 in6_ifdetach(ifp); 368 #endif 369 370 /* 371 * Delete all remaining routes using this interface 372 * Unfortuneatly the only way to do this is to slog through 373 * the entire routing table looking for routes which point 374 * to this interface...oh well... 375 */ 376 for (i = 1; i <= AF_MAX; i++) { 377 if ((rnh = rt_tables[i]) == NULL) 378 continue; 379 rnh->rnh_walktree(rnh, if_rtdel, ifp); 380 } 381 382 /* Announce that the interface is gone. */ 383 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 384 385 SLIST_FOREACH(dp, &domains, dom_next) 386 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 387 (*dp->dom_ifdetach)(ifp, 388 ifp->if_afdata[dp->dom_family]); 389 390 /* 391 * Remove interface from ifindex2ifp[] and maybe decrement if_index. 392 */ 393 ifindex2ifnet[ifp->if_index] = NULL; 394 while (if_index > 0 && ifindex2ifnet[if_index] == NULL) 395 if_index--; 396 397 TAILQ_REMOVE(&ifnet, ifp, if_link); 398 crit_exit(); 399 } 400 401 /* 402 * Delete Routes for a Network Interface 403 * 404 * Called for each routing entry via the rnh->rnh_walktree() call above 405 * to delete all route entries referencing a detaching network interface. 406 * 407 * Arguments: 408 * rn pointer to node in the routing table 409 * arg argument passed to rnh->rnh_walktree() - detaching interface 410 * 411 * Returns: 412 * 0 successful 413 * errno failed - reason indicated 414 * 415 */ 416 static int 417 if_rtdel(struct radix_node *rn, void *arg) 418 { 419 struct rtentry *rt = (struct rtentry *)rn; 420 struct ifnet *ifp = arg; 421 int err; 422 423 if (rt->rt_ifp == ifp) { 424 425 /* 426 * Protect (sorta) against walktree recursion problems 427 * with cloned routes 428 */ 429 if (!(rt->rt_flags & RTF_UP)) 430 return (0); 431 432 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 433 rt_mask(rt), rt->rt_flags, 434 (struct rtentry **) NULL); 435 if (err) { 436 log(LOG_WARNING, "if_rtdel: error %d\n", err); 437 } 438 } 439 440 return (0); 441 } 442 443 /* 444 * Create a clone network interface. 445 */ 446 int 447 if_clone_create(char *name, int len) 448 { 449 struct if_clone *ifc; 450 char *dp; 451 int wildcard, bytoff, bitoff; 452 int unit; 453 int err; 454 455 ifc = if_clone_lookup(name, &unit); 456 if (ifc == NULL) 457 return (EINVAL); 458 459 if (ifunit(name) != NULL) 460 return (EEXIST); 461 462 bytoff = bitoff = 0; 463 wildcard = (unit < 0); 464 /* 465 * Find a free unit if none was given. 466 */ 467 if (wildcard) { 468 while (bytoff < ifc->ifc_bmlen && 469 ifc->ifc_units[bytoff] == 0xff) 470 bytoff++; 471 if (bytoff >= ifc->ifc_bmlen) 472 return (ENOSPC); 473 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) 474 bitoff++; 475 unit = (bytoff << 3) + bitoff; 476 } 477 478 if (unit > ifc->ifc_maxunit) 479 return (ENXIO); 480 481 err = (*ifc->ifc_create)(ifc, unit); 482 if (err != 0) 483 return (err); 484 485 if (!wildcard) { 486 bytoff = unit >> 3; 487 bitoff = unit - (bytoff << 3); 488 } 489 490 /* 491 * Allocate the unit in the bitmap. 492 */ 493 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0, 494 ("%s: bit is already set", __func__)); 495 ifc->ifc_units[bytoff] |= (1 << bitoff); 496 497 /* In the wildcard case, we need to update the name. */ 498 if (wildcard) { 499 for (dp = name; *dp != '\0'; dp++); 500 if (snprintf(dp, len - (dp-name), "%d", unit) > 501 len - (dp-name) - 1) { 502 /* 503 * This can only be a programmer error and 504 * there's no straightforward way to recover if 505 * it happens. 506 */ 507 panic("if_clone_create(): interface name too long"); 508 } 509 510 } 511 512 EVENTHANDLER_INVOKE(if_clone_event, ifc); 513 514 return (0); 515 } 516 517 /* 518 * Destroy a clone network interface. 519 */ 520 int 521 if_clone_destroy(const char *name) 522 { 523 struct if_clone *ifc; 524 struct ifnet *ifp; 525 int bytoff, bitoff; 526 int unit; 527 528 ifc = if_clone_lookup(name, &unit); 529 if (ifc == NULL) 530 return (EINVAL); 531 532 if (unit < ifc->ifc_minifs) 533 return (EINVAL); 534 535 ifp = ifunit(name); 536 if (ifp == NULL) 537 return (ENXIO); 538 539 if (ifc->ifc_destroy == NULL) 540 return (EOPNOTSUPP); 541 542 (*ifc->ifc_destroy)(ifp); 543 544 /* 545 * Compute offset in the bitmap and deallocate the unit. 546 */ 547 bytoff = unit >> 3; 548 bitoff = unit - (bytoff << 3); 549 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0, 550 ("%s: bit is already cleared", __func__)); 551 ifc->ifc_units[bytoff] &= ~(1 << bitoff); 552 return (0); 553 } 554 555 /* 556 * Look up a network interface cloner. 557 */ 558 struct if_clone * 559 if_clone_lookup(const char *name, int *unitp) 560 { 561 struct if_clone *ifc; 562 const char *cp; 563 int i; 564 565 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) { 566 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) { 567 if (ifc->ifc_name[i] != *cp) 568 goto next_ifc; 569 } 570 goto found_name; 571 next_ifc: 572 ifc = LIST_NEXT(ifc, ifc_list); 573 } 574 575 /* No match. */ 576 return ((struct if_clone *)NULL); 577 578 found_name: 579 if (*cp == '\0') { 580 i = -1; 581 } else { 582 for (i = 0; *cp != '\0'; cp++) { 583 if (*cp < '0' || *cp > '9') { 584 /* Bogus unit number. */ 585 return (NULL); 586 } 587 i = (i * 10) + (*cp - '0'); 588 } 589 } 590 591 if (unitp != NULL) 592 *unitp = i; 593 return (ifc); 594 } 595 596 /* 597 * Register a network interface cloner. 598 */ 599 void 600 if_clone_attach(struct if_clone *ifc) 601 { 602 int bytoff, bitoff; 603 int err; 604 int len, maxclone; 605 int unit; 606 607 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit, 608 ("%s: %s requested more units then allowed (%d > %d)", 609 __func__, ifc->ifc_name, ifc->ifc_minifs, 610 ifc->ifc_maxunit + 1)); 611 /* 612 * Compute bitmap size and allocate it. 613 */ 614 maxclone = ifc->ifc_maxunit + 1; 615 len = maxclone >> 3; 616 if ((len << 3) < maxclone) 617 len++; 618 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO); 619 ifc->ifc_bmlen = len; 620 621 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 622 if_cloners_count++; 623 624 for (unit = 0; unit < ifc->ifc_minifs; unit++) { 625 err = (*ifc->ifc_create)(ifc, unit); 626 KASSERT(err == 0, 627 ("%s: failed to create required interface %s%d", 628 __func__, ifc->ifc_name, unit)); 629 630 /* Allocate the unit in the bitmap. */ 631 bytoff = unit >> 3; 632 bitoff = unit - (bytoff << 3); 633 ifc->ifc_units[bytoff] |= (1 << bitoff); 634 } 635 } 636 637 /* 638 * Unregister a network interface cloner. 639 */ 640 void 641 if_clone_detach(struct if_clone *ifc) 642 { 643 644 LIST_REMOVE(ifc, ifc_list); 645 free(ifc->ifc_units, M_CLONE); 646 if_cloners_count--; 647 } 648 649 /* 650 * Provide list of interface cloners to userspace. 651 */ 652 int 653 if_clone_list(struct if_clonereq *ifcr) 654 { 655 char outbuf[IFNAMSIZ], *dst; 656 struct if_clone *ifc; 657 int count, error = 0; 658 659 ifcr->ifcr_total = if_cloners_count; 660 if ((dst = ifcr->ifcr_buffer) == NULL) { 661 /* Just asking how many there are. */ 662 return (0); 663 } 664 665 if (ifcr->ifcr_count < 0) 666 return (EINVAL); 667 668 count = (if_cloners_count < ifcr->ifcr_count) ? 669 if_cloners_count : ifcr->ifcr_count; 670 671 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 672 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 673 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ); 674 error = copyout(outbuf, dst, IFNAMSIZ); 675 if (error) 676 break; 677 } 678 679 return (error); 680 } 681 682 /* 683 * Locate an interface based on a complete address. 684 */ 685 struct ifaddr * 686 ifa_ifwithaddr(struct sockaddr *addr) 687 { 688 struct ifnet *ifp; 689 struct ifaddr *ifa; 690 691 TAILQ_FOREACH(ifp, &ifnet, if_link) 692 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 693 if (ifa->ifa_addr->sa_family != addr->sa_family) 694 continue; 695 if (sa_equal(addr, ifa->ifa_addr)) 696 return (ifa); 697 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && 698 /* IPv6 doesn't have broadcast */ 699 ifa->ifa_broadaddr->sa_len != 0 && 700 sa_equal(ifa->ifa_broadaddr, addr)) 701 return (ifa); 702 } 703 return ((struct ifaddr *)NULL); 704 } 705 /* 706 * Locate the point to point interface with a given destination address. 707 */ 708 struct ifaddr * 709 ifa_ifwithdstaddr(struct sockaddr *addr) 710 { 711 struct ifnet *ifp; 712 struct ifaddr *ifa; 713 714 TAILQ_FOREACH(ifp, &ifnet, if_link) 715 if (ifp->if_flags & IFF_POINTOPOINT) 716 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 717 if (ifa->ifa_addr->sa_family != addr->sa_family) 718 continue; 719 if (ifa->ifa_dstaddr && 720 sa_equal(addr, ifa->ifa_dstaddr)) 721 return (ifa); 722 } 723 return ((struct ifaddr *)NULL); 724 } 725 726 /* 727 * Find an interface on a specific network. If many, choice 728 * is most specific found. 729 */ 730 struct ifaddr * 731 ifa_ifwithnet(struct sockaddr *addr) 732 { 733 struct ifnet *ifp; 734 struct ifaddr *ifa; 735 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 736 u_int af = addr->sa_family; 737 char *addr_data = addr->sa_data, *cplim; 738 739 /* 740 * AF_LINK addresses can be looked up directly by their index number, 741 * so do that if we can. 742 */ 743 if (af == AF_LINK) { 744 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 745 746 if (sdl->sdl_index && sdl->sdl_index <= if_index) 747 return (ifindex2ifnet[sdl->sdl_index]->if_lladdr); 748 } 749 750 /* 751 * Scan though each interface, looking for ones that have 752 * addresses in this address family. 753 */ 754 TAILQ_FOREACH(ifp, &ifnet, if_link) { 755 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 756 char *cp, *cp2, *cp3; 757 758 if (ifa->ifa_addr->sa_family != af) 759 next: continue; 760 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 761 /* 762 * This is a bit broken as it doesn't 763 * take into account that the remote end may 764 * be a single node in the network we are 765 * looking for. 766 * The trouble is that we don't know the 767 * netmask for the remote end. 768 */ 769 if (ifa->ifa_dstaddr != NULL && 770 sa_equal(addr, ifa->ifa_dstaddr)) 771 return (ifa); 772 } else { 773 /* 774 * if we have a special address handler, 775 * then use it instead of the generic one. 776 */ 777 if (ifa->ifa_claim_addr) { 778 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 779 return (ifa); 780 } else { 781 continue; 782 } 783 } 784 785 /* 786 * Scan all the bits in the ifa's address. 787 * If a bit dissagrees with what we are 788 * looking for, mask it with the netmask 789 * to see if it really matters. 790 * (A byte at a time) 791 */ 792 if (ifa->ifa_netmask == 0) 793 continue; 794 cp = addr_data; 795 cp2 = ifa->ifa_addr->sa_data; 796 cp3 = ifa->ifa_netmask->sa_data; 797 cplim = ifa->ifa_netmask->sa_len + 798 (char *)ifa->ifa_netmask; 799 while (cp3 < cplim) 800 if ((*cp++ ^ *cp2++) & *cp3++) 801 goto next; /* next address! */ 802 /* 803 * If the netmask of what we just found 804 * is more specific than what we had before 805 * (if we had one) then remember the new one 806 * before continuing to search 807 * for an even better one. 808 */ 809 if (ifa_maybe == 0 || 810 rn_refines((char *)ifa->ifa_netmask, 811 (char *)ifa_maybe->ifa_netmask)) 812 ifa_maybe = ifa; 813 } 814 } 815 } 816 return (ifa_maybe); 817 } 818 819 /* 820 * Find an interface address specific to an interface best matching 821 * a given address. 822 */ 823 struct ifaddr * 824 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 825 { 826 struct ifaddr *ifa; 827 char *cp, *cp2, *cp3; 828 char *cplim; 829 struct ifaddr *ifa_maybe = 0; 830 u_int af = addr->sa_family; 831 832 if (af >= AF_MAX) 833 return (0); 834 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 835 if (ifa->ifa_addr->sa_family != af) 836 continue; 837 if (ifa_maybe == 0) 838 ifa_maybe = ifa; 839 if (ifa->ifa_netmask == NULL) { 840 if (sa_equal(addr, ifa->ifa_addr) || 841 (ifa->ifa_dstaddr != NULL && 842 sa_equal(addr, ifa->ifa_dstaddr))) 843 return (ifa); 844 continue; 845 } 846 if (ifp->if_flags & IFF_POINTOPOINT) { 847 if (sa_equal(addr, ifa->ifa_dstaddr)) 848 return (ifa); 849 } else { 850 cp = addr->sa_data; 851 cp2 = ifa->ifa_addr->sa_data; 852 cp3 = ifa->ifa_netmask->sa_data; 853 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 854 for (; cp3 < cplim; cp3++) 855 if ((*cp++ ^ *cp2++) & *cp3) 856 break; 857 if (cp3 == cplim) 858 return (ifa); 859 } 860 } 861 return (ifa_maybe); 862 } 863 864 #include <net/route.h> 865 866 /* 867 * Default action when installing a route with a Link Level gateway. 868 * Lookup an appropriate real ifa to point to. 869 * This should be moved to /sys/net/link.c eventually. 870 */ 871 static void 872 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 873 { 874 struct ifaddr *ifa; 875 struct sockaddr *dst; 876 struct ifnet *ifp; 877 878 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL || 879 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL) 880 return; 881 ifa = ifaof_ifpforaddr(dst, ifp); 882 if (ifa != NULL) { 883 IFAFREE(rt->rt_ifa); 884 IFAREF(ifa); 885 rt->rt_ifa = ifa; 886 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 887 ifa->ifa_rtrequest(cmd, rt, info); 888 } 889 } 890 891 /* 892 * Mark an interface down and notify protocols of 893 * the transition. 894 * NOTE: must be called at splnet or eqivalent. 895 */ 896 void 897 if_unroute(struct ifnet *ifp, int flag, int fam) 898 { 899 struct ifaddr *ifa; 900 901 ifp->if_flags &= ~flag; 902 getmicrotime(&ifp->if_lastchange); 903 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 904 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 905 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 906 ifq_purge(&ifp->if_snd); 907 rt_ifmsg(ifp); 908 } 909 910 /* 911 * Mark an interface up and notify protocols of 912 * the transition. 913 * NOTE: must be called at splnet or eqivalent. 914 */ 915 void 916 if_route(struct ifnet *ifp, int flag, int fam) 917 { 918 struct ifaddr *ifa; 919 920 ifp->if_flags |= flag; 921 getmicrotime(&ifp->if_lastchange); 922 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 923 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 924 pfctlinput(PRC_IFUP, ifa->ifa_addr); 925 rt_ifmsg(ifp); 926 #ifdef INET6 927 in6_if_up(ifp); 928 #endif 929 } 930 931 /* 932 * Mark an interface down and notify protocols of the transition. An 933 * interface going down is also considered to be a synchronizing event. 934 * We must ensure that all packet processing related to the interface 935 * has completed before we return so e.g. the caller can free the ifnet 936 * structure that the mbufs may be referencing. 937 * 938 * NOTE: must be called at splnet or eqivalent. 939 */ 940 void 941 if_down(struct ifnet *ifp) 942 { 943 if_unroute(ifp, IFF_UP, AF_UNSPEC); 944 netmsg_service_sync(); 945 } 946 947 /* 948 * Mark an interface up and notify protocols of 949 * the transition. 950 * NOTE: must be called at splnet or eqivalent. 951 */ 952 void 953 if_up(struct ifnet *ifp) 954 { 955 956 if_route(ifp, IFF_UP, AF_UNSPEC); 957 } 958 959 /* 960 * Handle interface watchdog timer routines. Called 961 * from softclock, we decrement timers (if set) and 962 * call the appropriate interface routine on expiration. 963 */ 964 static void 965 if_slowtimo(void *arg) 966 { 967 struct ifnet *ifp; 968 969 crit_enter(); 970 971 TAILQ_FOREACH(ifp, &ifnet, if_link) { 972 if (ifp->if_timer == 0 || --ifp->if_timer) 973 continue; 974 if (ifp->if_watchdog) 975 (*ifp->if_watchdog)(ifp); 976 } 977 978 crit_exit(); 979 980 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 981 } 982 983 /* 984 * Map interface name to 985 * interface structure pointer. 986 */ 987 struct ifnet * 988 ifunit(const char *name) 989 { 990 struct ifnet *ifp; 991 992 /* 993 * Search all the interfaces for this name/number 994 */ 995 996 TAILQ_FOREACH(ifp, &ifnet, if_link) { 997 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0) 998 break; 999 } 1000 return (ifp); 1001 } 1002 1003 1004 /* 1005 * Map interface name in a sockaddr_dl to 1006 * interface structure pointer. 1007 */ 1008 struct ifnet * 1009 if_withname(struct sockaddr *sa) 1010 { 1011 char ifname[IFNAMSIZ+1]; 1012 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 1013 1014 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 1015 (sdl->sdl_nlen > IFNAMSIZ) ) 1016 return NULL; 1017 1018 /* 1019 * ifunit wants a null-terminated name. It may not be null-terminated 1020 * in the sockaddr. We don't want to change the caller's sockaddr, 1021 * and there might not be room to put the trailing null anyway, so we 1022 * make a local copy that we know we can null terminate safely. 1023 */ 1024 1025 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 1026 ifname[sdl->sdl_nlen] = '\0'; 1027 return ifunit(ifname); 1028 } 1029 1030 1031 /* 1032 * Interface ioctls. 1033 */ 1034 int 1035 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1036 { 1037 struct ifnet *ifp; 1038 struct ifreq *ifr; 1039 struct ifstat *ifs; 1040 int error; 1041 short oif_flags; 1042 int new_flags; 1043 size_t namelen, onamelen; 1044 char new_name[IFNAMSIZ]; 1045 struct ifaddr *ifa; 1046 struct sockaddr_dl *sdl; 1047 1048 switch (cmd) { 1049 1050 case SIOCGIFCONF: 1051 case OSIOCGIFCONF: 1052 return (ifconf(cmd, data, td)); 1053 } 1054 ifr = (struct ifreq *)data; 1055 1056 switch (cmd) { 1057 case SIOCIFCREATE: 1058 case SIOCIFDESTROY: 1059 if ((error = suser(td)) != 0) 1060 return (error); 1061 return ((cmd == SIOCIFCREATE) ? 1062 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1063 if_clone_destroy(ifr->ifr_name)); 1064 1065 case SIOCIFGCLONERS: 1066 return (if_clone_list((struct if_clonereq *)data)); 1067 } 1068 1069 ifp = ifunit(ifr->ifr_name); 1070 if (ifp == 0) 1071 return (ENXIO); 1072 switch (cmd) { 1073 1074 case SIOCGIFFLAGS: 1075 ifr->ifr_flags = ifp->if_flags; 1076 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1077 break; 1078 1079 case SIOCGIFCAP: 1080 ifr->ifr_reqcap = ifp->if_capabilities; 1081 ifr->ifr_curcap = ifp->if_capenable; 1082 break; 1083 1084 case SIOCGIFMETRIC: 1085 ifr->ifr_metric = ifp->if_metric; 1086 break; 1087 1088 case SIOCGIFMTU: 1089 ifr->ifr_mtu = ifp->if_mtu; 1090 break; 1091 1092 case SIOCGIFPHYS: 1093 ifr->ifr_phys = ifp->if_physical; 1094 break; 1095 1096 case SIOCSIFFLAGS: 1097 error = suser(td); 1098 if (error) 1099 return (error); 1100 new_flags = (ifr->ifr_flags & 0xffff) | 1101 (ifr->ifr_flagshigh << 16); 1102 if (ifp->if_flags & IFF_SMART) { 1103 /* Smart drivers twiddle their own routes */ 1104 } else if (ifp->if_flags & IFF_UP && 1105 (new_flags & IFF_UP) == 0) { 1106 crit_enter(); 1107 if_down(ifp); 1108 crit_exit(); 1109 } else if (new_flags & IFF_UP && 1110 (ifp->if_flags & IFF_UP) == 0) { 1111 crit_enter(); 1112 if_up(ifp); 1113 crit_exit(); 1114 } 1115 1116 #ifdef DEVICE_POLLING 1117 if ((new_flags ^ ifp->if_flags) & IFF_POLLING) { 1118 if (new_flags & IFF_POLLING) { 1119 ether_poll_register(ifp); 1120 } else { 1121 ether_poll_deregister(ifp); 1122 } 1123 } 1124 #endif 1125 1126 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1127 (new_flags &~ IFF_CANTCHANGE); 1128 if (new_flags & IFF_PPROMISC) { 1129 /* Permanently promiscuous mode requested */ 1130 ifp->if_flags |= IFF_PROMISC; 1131 } else if (ifp->if_pcount == 0) { 1132 ifp->if_flags &= ~IFF_PROMISC; 1133 } 1134 if (ifp->if_ioctl) 1135 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1136 getmicrotime(&ifp->if_lastchange); 1137 break; 1138 1139 case SIOCSIFCAP: 1140 error = suser(td); 1141 if (error) 1142 return (error); 1143 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1144 return (EINVAL); 1145 (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1146 break; 1147 1148 case SIOCSIFNAME: 1149 error = suser(td); 1150 if (error != 0) 1151 return (error); 1152 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1153 if (error != 0) 1154 return (error); 1155 if (new_name[0] == '\0') 1156 return (EINVAL); 1157 if (ifunit(new_name) != NULL) 1158 return (EEXIST); 1159 1160 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 1161 1162 /* Announce the departure of the interface. */ 1163 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1164 1165 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1166 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1167 /* XXX IFA_LOCK(ifa); */ 1168 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1169 namelen = strlen(new_name); 1170 onamelen = sdl->sdl_nlen; 1171 /* 1172 * Move the address if needed. This is safe because we 1173 * allocate space for a name of length IFNAMSIZ when we 1174 * create this in if_attach(). 1175 */ 1176 if (namelen != onamelen) { 1177 bcopy(sdl->sdl_data + onamelen, 1178 sdl->sdl_data + namelen, sdl->sdl_alen); 1179 } 1180 bcopy(new_name, sdl->sdl_data, namelen); 1181 sdl->sdl_nlen = namelen; 1182 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1183 bzero(sdl->sdl_data, onamelen); 1184 while (namelen != 0) 1185 sdl->sdl_data[--namelen] = 0xff; 1186 /* XXX IFA_UNLOCK(ifa) */ 1187 1188 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 1189 1190 /* Announce the return of the interface. */ 1191 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1192 break; 1193 1194 case SIOCSIFMETRIC: 1195 error = suser(td); 1196 if (error) 1197 return (error); 1198 ifp->if_metric = ifr->ifr_metric; 1199 getmicrotime(&ifp->if_lastchange); 1200 break; 1201 1202 case SIOCSIFPHYS: 1203 error = suser(td); 1204 if (error) 1205 return error; 1206 if (!ifp->if_ioctl) 1207 return EOPNOTSUPP; 1208 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1209 if (error == 0) 1210 getmicrotime(&ifp->if_lastchange); 1211 return (error); 1212 1213 case SIOCSIFMTU: 1214 { 1215 u_long oldmtu = ifp->if_mtu; 1216 1217 error = suser(td); 1218 if (error) 1219 return (error); 1220 if (ifp->if_ioctl == NULL) 1221 return (EOPNOTSUPP); 1222 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1223 return (EINVAL); 1224 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1225 if (error == 0) { 1226 getmicrotime(&ifp->if_lastchange); 1227 rt_ifmsg(ifp); 1228 } 1229 /* 1230 * If the link MTU changed, do network layer specific procedure. 1231 */ 1232 if (ifp->if_mtu != oldmtu) { 1233 #ifdef INET6 1234 nd6_setmtu(ifp); 1235 #endif 1236 } 1237 return (error); 1238 } 1239 1240 case SIOCADDMULTI: 1241 case SIOCDELMULTI: 1242 error = suser(td); 1243 if (error) 1244 return (error); 1245 1246 /* Don't allow group membership on non-multicast interfaces. */ 1247 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1248 return EOPNOTSUPP; 1249 1250 /* Don't let users screw up protocols' entries. */ 1251 if (ifr->ifr_addr.sa_family != AF_LINK) 1252 return EINVAL; 1253 1254 if (cmd == SIOCADDMULTI) { 1255 struct ifmultiaddr *ifma; 1256 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1257 } else { 1258 error = if_delmulti(ifp, &ifr->ifr_addr); 1259 } 1260 if (error == 0) 1261 getmicrotime(&ifp->if_lastchange); 1262 return error; 1263 1264 case SIOCSIFPHYADDR: 1265 case SIOCDIFPHYADDR: 1266 #ifdef INET6 1267 case SIOCSIFPHYADDR_IN6: 1268 #endif 1269 case SIOCSLIFPHYADDR: 1270 case SIOCSIFMEDIA: 1271 case SIOCSIFGENERIC: 1272 error = suser(td); 1273 if (error) 1274 return (error); 1275 if (ifp->if_ioctl == 0) 1276 return (EOPNOTSUPP); 1277 error = (*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred); 1278 if (error == 0) 1279 getmicrotime(&ifp->if_lastchange); 1280 return error; 1281 1282 case SIOCGIFSTATUS: 1283 ifs = (struct ifstat *)data; 1284 ifs->ascii[0] = '\0'; 1285 1286 case SIOCGIFPSRCADDR: 1287 case SIOCGIFPDSTADDR: 1288 case SIOCGLIFPHYADDR: 1289 case SIOCGIFMEDIA: 1290 case SIOCGIFGENERIC: 1291 if (ifp->if_ioctl == 0) 1292 return (EOPNOTSUPP); 1293 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred)); 1294 1295 case SIOCSIFLLADDR: 1296 error = suser(td); 1297 if (error) 1298 return (error); 1299 return if_setlladdr(ifp, 1300 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1301 1302 default: 1303 oif_flags = ifp->if_flags; 1304 if (so->so_proto == 0) 1305 return (EOPNOTSUPP); 1306 #ifndef COMPAT_43 1307 error = so_pru_control(so, cmd, data, ifp, td); 1308 #else 1309 { 1310 int ocmd = cmd; 1311 1312 switch (cmd) { 1313 1314 case SIOCSIFDSTADDR: 1315 case SIOCSIFADDR: 1316 case SIOCSIFBRDADDR: 1317 case SIOCSIFNETMASK: 1318 #if BYTE_ORDER != BIG_ENDIAN 1319 if (ifr->ifr_addr.sa_family == 0 && 1320 ifr->ifr_addr.sa_len < 16) { 1321 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1322 ifr->ifr_addr.sa_len = 16; 1323 } 1324 #else 1325 if (ifr->ifr_addr.sa_len == 0) 1326 ifr->ifr_addr.sa_len = 16; 1327 #endif 1328 break; 1329 1330 case OSIOCGIFADDR: 1331 cmd = SIOCGIFADDR; 1332 break; 1333 1334 case OSIOCGIFDSTADDR: 1335 cmd = SIOCGIFDSTADDR; 1336 break; 1337 1338 case OSIOCGIFBRDADDR: 1339 cmd = SIOCGIFBRDADDR; 1340 break; 1341 1342 case OSIOCGIFNETMASK: 1343 cmd = SIOCGIFNETMASK; 1344 } 1345 error = so_pru_control(so, cmd, data, ifp, td); 1346 switch (ocmd) { 1347 1348 case OSIOCGIFADDR: 1349 case OSIOCGIFDSTADDR: 1350 case OSIOCGIFBRDADDR: 1351 case OSIOCGIFNETMASK: 1352 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1353 1354 } 1355 } 1356 #endif /* COMPAT_43 */ 1357 1358 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1359 #ifdef INET6 1360 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1361 if (ifp->if_flags & IFF_UP) { 1362 crit_enter(); 1363 in6_if_up(ifp); 1364 crit_exit(); 1365 } 1366 #endif 1367 } 1368 return (error); 1369 1370 } 1371 return (0); 1372 } 1373 1374 /* 1375 * Set/clear promiscuous mode on interface ifp based on the truth value 1376 * of pswitch. The calls are reference counted so that only the first 1377 * "on" request actually has an effect, as does the final "off" request. 1378 * Results are undefined if the "off" and "on" requests are not matched. 1379 */ 1380 int 1381 ifpromisc(struct ifnet *ifp, int pswitch) 1382 { 1383 struct ifreq ifr; 1384 int error; 1385 int oldflags; 1386 1387 oldflags = ifp->if_flags; 1388 if (ifp->if_flags & IFF_PPROMISC) { 1389 /* Do nothing if device is in permanently promiscuous mode */ 1390 ifp->if_pcount += pswitch ? 1 : -1; 1391 return (0); 1392 } 1393 if (pswitch) { 1394 /* 1395 * If the device is not configured up, we cannot put it in 1396 * promiscuous mode. 1397 */ 1398 if ((ifp->if_flags & IFF_UP) == 0) 1399 return (ENETDOWN); 1400 if (ifp->if_pcount++ != 0) 1401 return (0); 1402 ifp->if_flags |= IFF_PROMISC; 1403 log(LOG_INFO, "%s: promiscuous mode enabled\n", 1404 ifp->if_xname); 1405 } else { 1406 if (--ifp->if_pcount > 0) 1407 return (0); 1408 ifp->if_flags &= ~IFF_PROMISC; 1409 log(LOG_INFO, "%s: promiscuous mode disabled\n", 1410 ifp->if_xname); 1411 } 1412 ifr.ifr_flags = ifp->if_flags; 1413 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1414 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1415 (struct ucred *)NULL); 1416 if (error == 0) 1417 rt_ifmsg(ifp); 1418 else 1419 ifp->if_flags = oldflags; 1420 return error; 1421 } 1422 1423 /* 1424 * Return interface configuration 1425 * of system. List may be used 1426 * in later ioctl's (above) to get 1427 * other information. 1428 */ 1429 static int 1430 ifconf(u_long cmd, caddr_t data, struct thread *td) 1431 { 1432 struct ifconf *ifc = (struct ifconf *)data; 1433 struct ifnet *ifp; 1434 struct ifaddr *ifa; 1435 struct sockaddr *sa; 1436 struct ifreq ifr, *ifrp; 1437 int space = ifc->ifc_len, error = 0; 1438 1439 ifrp = ifc->ifc_req; 1440 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1441 int addrs; 1442 1443 if (space <= sizeof ifr) 1444 break; 1445 1446 /* 1447 * Zero the stack declared structure first to prevent 1448 * memory disclosure. 1449 */ 1450 bzero(&ifr, sizeof(ifr)); 1451 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1452 >= sizeof(ifr.ifr_name)) { 1453 error = ENAMETOOLONG; 1454 break; 1455 } 1456 1457 addrs = 0; 1458 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1459 if (space <= sizeof ifr) 1460 break; 1461 sa = ifa->ifa_addr; 1462 if (td->td_proc->p_ucred->cr_prison && 1463 prison_if(td, sa)) 1464 continue; 1465 addrs++; 1466 #ifdef COMPAT_43 1467 if (cmd == OSIOCGIFCONF) { 1468 struct osockaddr *osa = 1469 (struct osockaddr *)&ifr.ifr_addr; 1470 ifr.ifr_addr = *sa; 1471 osa->sa_family = sa->sa_family; 1472 error = copyout(&ifr, ifrp, sizeof ifr); 1473 ifrp++; 1474 } else 1475 #endif 1476 if (sa->sa_len <= sizeof(*sa)) { 1477 ifr.ifr_addr = *sa; 1478 error = copyout(&ifr, ifrp, sizeof ifr); 1479 ifrp++; 1480 } else { 1481 if (space < (sizeof ifr) + sa->sa_len - 1482 sizeof(*sa)) 1483 break; 1484 space -= sa->sa_len - sizeof(*sa); 1485 error = copyout(&ifr, ifrp, 1486 sizeof ifr.ifr_name); 1487 if (error == 0) 1488 error = copyout(sa, &ifrp->ifr_addr, 1489 sa->sa_len); 1490 ifrp = (struct ifreq *) 1491 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1492 } 1493 if (error) 1494 break; 1495 space -= sizeof ifr; 1496 } 1497 if (error) 1498 break; 1499 if (!addrs) { 1500 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr); 1501 error = copyout(&ifr, ifrp, sizeof ifr); 1502 if (error) 1503 break; 1504 space -= sizeof ifr; 1505 ifrp++; 1506 } 1507 } 1508 ifc->ifc_len -= space; 1509 return (error); 1510 } 1511 1512 /* 1513 * Just like if_promisc(), but for all-multicast-reception mode. 1514 */ 1515 int 1516 if_allmulti(struct ifnet *ifp, int onswitch) 1517 { 1518 int error = 0; 1519 struct ifreq ifr; 1520 1521 crit_enter(); 1522 1523 if (onswitch) { 1524 if (ifp->if_amcount++ == 0) { 1525 ifp->if_flags |= IFF_ALLMULTI; 1526 ifr.ifr_flags = ifp->if_flags; 1527 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1528 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1529 (struct ucred *)NULL); 1530 } 1531 } else { 1532 if (ifp->if_amcount > 1) { 1533 ifp->if_amcount--; 1534 } else { 1535 ifp->if_amcount = 0; 1536 ifp->if_flags &= ~IFF_ALLMULTI; 1537 ifr.ifr_flags = ifp->if_flags; 1538 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1539 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1540 (struct ucred *)NULL); 1541 } 1542 } 1543 1544 crit_exit(); 1545 1546 if (error == 0) 1547 rt_ifmsg(ifp); 1548 return error; 1549 } 1550 1551 /* 1552 * Add a multicast listenership to the interface in question. 1553 * The link layer provides a routine which converts 1554 */ 1555 int 1556 if_addmulti( 1557 struct ifnet *ifp, /* interface to manipulate */ 1558 struct sockaddr *sa, /* address to add */ 1559 struct ifmultiaddr **retifma) 1560 { 1561 struct sockaddr *llsa, *dupsa; 1562 int error; 1563 struct ifmultiaddr *ifma; 1564 1565 /* 1566 * If the matching multicast address already exists 1567 * then don't add a new one, just add a reference 1568 */ 1569 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1570 if (sa_equal(sa, ifma->ifma_addr)) { 1571 ifma->ifma_refcount++; 1572 if (retifma) 1573 *retifma = ifma; 1574 return 0; 1575 } 1576 } 1577 1578 /* 1579 * Give the link layer a chance to accept/reject it, and also 1580 * find out which AF_LINK address this maps to, if it isn't one 1581 * already. 1582 */ 1583 if (ifp->if_resolvemulti) { 1584 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1585 if (error) return error; 1586 } else { 1587 llsa = 0; 1588 } 1589 1590 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1591 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1592 bcopy(sa, dupsa, sa->sa_len); 1593 1594 ifma->ifma_addr = dupsa; 1595 ifma->ifma_lladdr = llsa; 1596 ifma->ifma_ifp = ifp; 1597 ifma->ifma_refcount = 1; 1598 ifma->ifma_protospec = 0; 1599 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1600 1601 /* 1602 * Some network interfaces can scan the address list at 1603 * interrupt time; lock them out. 1604 */ 1605 crit_enter(); 1606 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1607 crit_exit(); 1608 *retifma = ifma; 1609 1610 if (llsa != 0) { 1611 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1612 if (sa_equal(ifma->ifma_addr, llsa)) 1613 break; 1614 } 1615 if (ifma) { 1616 ifma->ifma_refcount++; 1617 } else { 1618 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1619 M_IFMADDR, M_WAITOK); 1620 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1621 M_IFMADDR, M_WAITOK); 1622 bcopy(llsa, dupsa, llsa->sa_len); 1623 ifma->ifma_addr = dupsa; 1624 ifma->ifma_ifp = ifp; 1625 ifma->ifma_refcount = 1; 1626 crit_enter(); 1627 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1628 crit_exit(); 1629 } 1630 } 1631 /* 1632 * We are certain we have added something, so call down to the 1633 * interface to let them know about it. 1634 */ 1635 crit_enter(); 1636 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, (struct ucred *)NULL); 1637 crit_exit(); 1638 1639 return 0; 1640 } 1641 1642 /* 1643 * Remove a reference to a multicast address on this interface. Yell 1644 * if the request does not match an existing membership. 1645 */ 1646 int 1647 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1648 { 1649 struct ifmultiaddr *ifma; 1650 1651 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1652 if (sa_equal(sa, ifma->ifma_addr)) 1653 break; 1654 if (ifma == 0) 1655 return ENOENT; 1656 1657 if (ifma->ifma_refcount > 1) { 1658 ifma->ifma_refcount--; 1659 return 0; 1660 } 1661 1662 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1663 sa = ifma->ifma_lladdr; 1664 crit_enter(); 1665 LIST_REMOVE(ifma, ifma_link); 1666 /* 1667 * Make sure the interface driver is notified 1668 * in the case of a link layer mcast group being left. 1669 */ 1670 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1671 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL); 1672 crit_exit(); 1673 free(ifma->ifma_addr, M_IFMADDR); 1674 free(ifma, M_IFMADDR); 1675 if (sa == 0) 1676 return 0; 1677 1678 /* 1679 * Now look for the link-layer address which corresponds to 1680 * this network address. It had been squirreled away in 1681 * ifma->ifma_lladdr for this purpose (so we don't have 1682 * to call ifp->if_resolvemulti() again), and we saved that 1683 * value in sa above. If some nasty deleted the 1684 * link-layer address out from underneath us, we can deal because 1685 * the address we stored was is not the same as the one which was 1686 * in the record for the link-layer address. (So we don't complain 1687 * in that case.) 1688 */ 1689 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1690 if (sa_equal(sa, ifma->ifma_addr)) 1691 break; 1692 if (ifma == 0) 1693 return 0; 1694 1695 if (ifma->ifma_refcount > 1) { 1696 ifma->ifma_refcount--; 1697 return 0; 1698 } 1699 1700 crit_enter(); 1701 LIST_REMOVE(ifma, ifma_link); 1702 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, (struct ucred *)NULL); 1703 crit_exit(); 1704 free(ifma->ifma_addr, M_IFMADDR); 1705 free(sa, M_IFMADDR); 1706 free(ifma, M_IFMADDR); 1707 1708 return 0; 1709 } 1710 1711 /* 1712 * Set the link layer address on an interface. 1713 * 1714 * At this time we only support certain types of interfaces, 1715 * and we don't allow the length of the address to change. 1716 */ 1717 int 1718 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1719 { 1720 struct sockaddr_dl *sdl; 1721 struct ifaddr *ifa; 1722 struct ifreq ifr; 1723 1724 sdl = IF_LLSOCKADDR(ifp); 1725 if (sdl == NULL) 1726 return (EINVAL); 1727 if (len != sdl->sdl_alen) /* don't allow length to change */ 1728 return (EINVAL); 1729 switch (ifp->if_type) { 1730 case IFT_ETHER: /* these types use struct arpcom */ 1731 case IFT_FDDI: 1732 case IFT_XETHER: 1733 case IFT_ISO88025: 1734 case IFT_L2VLAN: 1735 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1736 /* FALLTHROUGH */ 1737 case IFT_ARCNET: 1738 bcopy(lladdr, LLADDR(sdl), len); 1739 break; 1740 default: 1741 return (ENODEV); 1742 } 1743 /* 1744 * If the interface is already up, we need 1745 * to re-init it in order to reprogram its 1746 * address filter. 1747 */ 1748 if ((ifp->if_flags & IFF_UP) != 0) { 1749 ifp->if_flags &= ~IFF_UP; 1750 ifr.ifr_flags = ifp->if_flags; 1751 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1752 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1753 (struct ucred *)NULL); 1754 ifp->if_flags |= IFF_UP; 1755 ifr.ifr_flags = ifp->if_flags; 1756 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1757 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1758 (struct ucred *)NULL); 1759 #ifdef INET 1760 /* 1761 * Also send gratuitous ARPs to notify other nodes about 1762 * the address change. 1763 */ 1764 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1765 if (ifa->ifa_addr != NULL && 1766 ifa->ifa_addr->sa_family == AF_INET) 1767 arp_ifinit(ifp, ifa); 1768 } 1769 #endif 1770 } 1771 return (0); 1772 } 1773 1774 struct ifmultiaddr * 1775 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 1776 { 1777 struct ifmultiaddr *ifma; 1778 1779 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1780 if (sa_equal(ifma->ifma_addr, sa)) 1781 break; 1782 1783 return ifma; 1784 } 1785 1786 /* 1787 * The name argument must be a pointer to storage which will last as 1788 * long as the interface does. For physical devices, the result of 1789 * device_get_name(dev) is a good choice and for pseudo-devices a 1790 * static string works well. 1791 */ 1792 void 1793 if_initname(struct ifnet *ifp, const char *name, int unit) 1794 { 1795 ifp->if_dname = name; 1796 ifp->if_dunit = unit; 1797 if (unit != IF_DUNIT_NONE) 1798 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 1799 else 1800 strlcpy(ifp->if_xname, name, IFNAMSIZ); 1801 } 1802 1803 int 1804 if_printf(struct ifnet *ifp, const char *fmt, ...) 1805 { 1806 __va_list ap; 1807 int retval; 1808 1809 retval = printf("%s: ", ifp->if_xname); 1810 __va_start(ap, fmt); 1811 retval += vprintf(fmt, ap); 1812 __va_end(ap); 1813 return (retval); 1814 } 1815 1816 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1817 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 1818 1819 void 1820 ifq_set_classic(struct ifaltq *ifq) 1821 { 1822 ifq->altq_enqueue = ifq_classic_enqueue; 1823 ifq->altq_dequeue = ifq_classic_dequeue; 1824 ifq->altq_request = ifq_classic_request; 1825 } 1826 1827 static int 1828 ifq_classic_enqueue(struct ifaltq *ifq, struct mbuf *m, 1829 struct altq_pktattr *pa __unused) 1830 { 1831 crit_enter(); 1832 if (IF_QFULL(ifq)) { 1833 m_freem(m); 1834 crit_exit(); 1835 return(ENOBUFS); 1836 } else { 1837 IF_ENQUEUE(ifq, m); 1838 crit_exit(); 1839 return(0); 1840 } 1841 } 1842 1843 static struct mbuf * 1844 ifq_classic_dequeue(struct ifaltq *ifq, int op) 1845 { 1846 struct mbuf *m; 1847 1848 crit_enter(); 1849 switch (op) { 1850 case ALTDQ_POLL: 1851 IF_POLL(ifq, m); 1852 break; 1853 case ALTDQ_REMOVE: 1854 IF_DEQUEUE(ifq, m); 1855 break; 1856 default: 1857 panic("unsupported ALTQ dequeue op: %d", op); 1858 } 1859 crit_exit(); 1860 return(m); 1861 } 1862 1863 static int 1864 ifq_classic_request(struct ifaltq *ifq, int req, void *arg) 1865 { 1866 crit_enter(); 1867 switch (req) { 1868 case ALTRQ_PURGE: 1869 IF_DRAIN(ifq); 1870 break; 1871 default: 1872 panic("unspported ALTQ request: %d", req); 1873 } 1874 crit_exit(); 1875 return(0); 1876 } 1877 1878