if.c revision 71959
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: head/sys/net/if.c 71959 2001-02-03 11:46:35Z phk $ 35 */ 36 37#include "opt_compat.h" 38#include "opt_inet6.h" 39#include "opt_inet.h" 40 41#include <sys/param.h> 42#include <sys/malloc.h> 43#include <sys/mbuf.h> 44#include <sys/systm.h> 45#include <sys/proc.h> 46#include <sys/socket.h> 47#include <sys/socketvar.h> 48#include <sys/protosw.h> 49#include <sys/kernel.h> 50#include <sys/sockio.h> 51#include <sys/syslog.h> 52#include <sys/sysctl.h> 53 54#include <net/if.h> 55#include <net/if_arp.h> 56#include <net/if_dl.h> 57#include <net/if_types.h> 58#include <net/radix.h> 59#include <net/route.h> 60 61#if defined(INET) || defined(INET6) 62/*XXX*/ 63#include <netinet/in.h> 64#include <netinet/in_var.h> 65#ifdef INET6 66#include <netinet6/in6_var.h> 67#include <netinet6/in6_ifattach.h> 68#endif 69#endif 70 71/* 72 * System initialization 73 */ 74 75static int ifconf __P((u_long, caddr_t)); 76static void ifinit __P((void *)); 77static void if_qflush __P((struct ifqueue *)); 78static void if_slowtimo __P((void *)); 79static void link_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 80static int if_rtdel __P((struct radix_node *, void *)); 81 82SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL) 83 84MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 85MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 86 87int ifqmaxlen = IFQ_MAXLEN; 88struct ifnethead ifnet; /* depend on static init XXX */ 89 90#ifdef INET6 91/* 92 * XXX: declare here to avoid to include many inet6 related files.. 93 * should be more generalized? 94 */ 95extern void nd6_setmtu __P((struct ifnet *)); 96#endif 97 98/* 99 * Network interface utility routines. 100 * 101 * Routines with ifa_ifwith* names take sockaddr *'s as 102 * parameters. 103 */ 104/* ARGSUSED*/ 105void 106ifinit(dummy) 107 void *dummy; 108{ 109 struct ifnet *ifp; 110 int s; 111 112 s = splimp(); 113 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_link)) { 114 if (ifp->if_snd.ifq_maxlen == 0) { 115 printf("%s%d XXX: driver didn't set ifq_maxlen\n", 116 ifp->if_name, ifp->if_unit); 117 ifp->if_snd.ifq_maxlen = ifqmaxlen; 118 } 119 /* XXX This is an access violation of the mutex internals. */ 120 if (ifp->if_snd.ifq_mtx.mtx_description == NULL) { 121 printf("%s%d XXX: driver didn't initialize queue mtx\n", 122 ifp->if_name, ifp->if_unit); 123 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", MTX_DEF); 124 } 125 } 126 splx(s); 127 if_slowtimo(0); 128} 129 130int if_index = 0; 131struct ifaddr **ifnet_addrs; 132struct ifnet **ifindex2ifnet = NULL; 133 134 135/* 136 * Attach an interface to the 137 * list of "active" interfaces. 138 */ 139void 140if_attach(ifp) 141 struct ifnet *ifp; 142{ 143 unsigned socksize, ifasize; 144 int namelen, masklen; 145 char workbuf[64]; 146 register struct sockaddr_dl *sdl; 147 register struct ifaddr *ifa; 148 static int if_indexlim = 8; 149 static int inited; 150 151 if (!inited) { 152 TAILQ_INIT(&ifnet); 153 inited = 1; 154 } 155 156 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 157 ifp->if_index = ++if_index; 158 /* 159 * XXX - 160 * The old code would work if the interface passed a pre-existing 161 * chain of ifaddrs to this code. We don't trust our callers to 162 * properly initialize the tailq, however, so we no longer allow 163 * this unlikely case. 164 */ 165 TAILQ_INIT(&ifp->if_addrhead); 166 TAILQ_INIT(&ifp->if_prefixhead); 167 LIST_INIT(&ifp->if_multiaddrs); 168 getmicrotime(&ifp->if_lastchange); 169 if (ifnet_addrs == 0 || if_index >= if_indexlim) { 170 unsigned n = (if_indexlim <<= 1) * sizeof(ifa); 171 caddr_t q = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 172 if (ifnet_addrs) { 173 bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2); 174 free((caddr_t)ifnet_addrs, M_IFADDR); 175 } 176 ifnet_addrs = (struct ifaddr **)q; 177 178 /* grow ifindex2ifnet */ 179 n = if_indexlim * sizeof(struct ifnet *); 180 q = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 181 if (ifindex2ifnet) { 182 bcopy((caddr_t)ifindex2ifnet, q, n/2); 183 free((caddr_t)ifindex2ifnet, M_IFADDR); 184 } 185 ifindex2ifnet = (struct ifnet **)q; 186 } 187 188 ifindex2ifnet[if_index] = ifp; 189 190 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_name, MTX_DEF); 191 192 /* 193 * create a Link Level name for this device 194 */ 195 namelen = snprintf(workbuf, sizeof(workbuf), 196 "%s%d", ifp->if_name, ifp->if_unit); 197#define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m)) 198 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen; 199 socksize = masklen + ifp->if_addrlen; 200#define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1))) 201 if (socksize < sizeof(*sdl)) 202 socksize = sizeof(*sdl); 203 socksize = ROUNDUP(socksize); 204 ifasize = sizeof(*ifa) + 2 * socksize; 205 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 206 if (ifa) { 207 sdl = (struct sockaddr_dl *)(ifa + 1); 208 sdl->sdl_len = socksize; 209 sdl->sdl_family = AF_LINK; 210 bcopy(workbuf, sdl->sdl_data, namelen); 211 sdl->sdl_nlen = namelen; 212 sdl->sdl_index = ifp->if_index; 213 sdl->sdl_type = ifp->if_type; 214 ifnet_addrs[if_index - 1] = ifa; 215 ifa->ifa_ifp = ifp; 216 ifa->ifa_rtrequest = link_rtrequest; 217 ifa->ifa_addr = (struct sockaddr *)sdl; 218 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 219 ifa->ifa_netmask = (struct sockaddr *)sdl; 220 sdl->sdl_len = masklen; 221 while (namelen != 0) 222 sdl->sdl_data[--namelen] = 0xff; 223 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 224 } 225} 226 227/* 228 * Detach an interface, removing it from the 229 * list of "active" interfaces. 230 */ 231void 232if_detach(ifp) 233 struct ifnet *ifp; 234{ 235 struct ifaddr *ifa; 236 struct radix_node_head *rnh; 237 int s; 238 int i; 239 240 /* 241 * Remove routes and flush queues. 242 */ 243 s = splnet(); 244 if_down(ifp); 245 246 /* 247 * Remove address from ifnet_addrs[] and maybe decrement if_index. 248 * Clean up all addresses. 249 */ 250 ifnet_addrs[ifp->if_index - 1] = 0; 251 while (if_index > 0 && ifnet_addrs[if_index - 1] == 0) 252 if_index--; 253 254 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 255 ifa = TAILQ_FIRST(&ifp->if_addrhead)) { 256#ifdef INET 257 /* XXX: Ugly!! ad hoc just for INET */ 258 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 259 struct ifaliasreq ifr; 260 261 bzero(&ifr, sizeof(ifr)); 262 ifr.ifra_addr = *ifa->ifa_addr; 263 if (ifa->ifa_dstaddr) 264 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 265 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 266 NULL) == 0) 267 continue; 268 } 269#endif /* INET */ 270#ifdef INET6 271 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 272 in6_purgeaddr(ifa, ifp); 273 /* ifp_addrhead is already updated */ 274 continue; 275 } 276#endif /* INET6 */ 277 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 278 IFAFREE(ifa); 279 } 280 281 /* 282 * Delete all remaining routes using this interface 283 * Unfortuneatly the only way to do this is to slog through 284 * the entire routing table looking for routes which point 285 * to this interface...oh well... 286 */ 287 for (i = 1; i <= AF_MAX; i++) { 288 if ((rnh = rt_tables[i]) == NULL) 289 continue; 290 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 291 } 292 293#ifdef INET6 294 /* nuke all IPv6 kernel structs related to ifp */ 295 in6_ifdetach(ifp); 296#endif 297 298 TAILQ_REMOVE(&ifnet, ifp, if_link); 299 mtx_destroy(&ifp->if_snd.ifq_mtx); 300 splx(s); 301} 302 303/* 304 * Delete Routes for a Network Interface 305 * 306 * Called for each routing entry via the rnh->rnh_walktree() call above 307 * to delete all route entries referencing a detaching network interface. 308 * 309 * Arguments: 310 * rn pointer to node in the routing table 311 * arg argument passed to rnh->rnh_walktree() - detaching interface 312 * 313 * Returns: 314 * 0 successful 315 * errno failed - reason indicated 316 * 317 */ 318static int 319if_rtdel(rn, arg) 320 struct radix_node *rn; 321 void *arg; 322{ 323 struct rtentry *rt = (struct rtentry *)rn; 324 struct ifnet *ifp = arg; 325 int err; 326 327 if (rt->rt_ifp == ifp) { 328 329 /* 330 * Protect (sorta) against walktree recursion problems 331 * with cloned routes 332 */ 333 if ((rt->rt_flags & RTF_UP) == 0) 334 return (0); 335 336 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 337 rt_mask(rt), rt->rt_flags, 338 (struct rtentry **) NULL); 339 if (err) { 340 log(LOG_WARNING, "if_rtdel: error %d\n", err); 341 } 342 } 343 344 return (0); 345} 346 347/* 348 * Locate an interface based on a complete address. 349 */ 350/*ARGSUSED*/ 351struct ifaddr * 352ifa_ifwithaddr(addr) 353 register struct sockaddr *addr; 354{ 355 register struct ifnet *ifp; 356 register struct ifaddr *ifa; 357 358#define equal(a1, a2) \ 359 (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0) 360 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_link)) 361 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 362 ifa = TAILQ_NEXT(ifa, ifa_link)) { 363 if (ifa->ifa_addr->sa_family != addr->sa_family) 364 continue; 365 if (equal(addr, ifa->ifa_addr)) 366 return (ifa); 367 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && 368 /* IP6 doesn't have broadcast */ 369 ifa->ifa_broadaddr->sa_len != 0 && 370 equal(ifa->ifa_broadaddr, addr)) 371 return (ifa); 372 } 373 return ((struct ifaddr *)0); 374} 375/* 376 * Locate the point to point interface with a given destination address. 377 */ 378/*ARGSUSED*/ 379struct ifaddr * 380ifa_ifwithdstaddr(addr) 381 register struct sockaddr *addr; 382{ 383 register struct ifnet *ifp; 384 register struct ifaddr *ifa; 385 386 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_link)) 387 if (ifp->if_flags & IFF_POINTOPOINT) 388 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 389 ifa = TAILQ_NEXT(ifa, ifa_link)) { 390 if (ifa->ifa_addr->sa_family != addr->sa_family) 391 continue; 392 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 393 return (ifa); 394 } 395 return ((struct ifaddr *)0); 396} 397 398/* 399 * Find an interface on a specific network. If many, choice 400 * is most specific found. 401 */ 402struct ifaddr * 403ifa_ifwithnet(addr) 404 struct sockaddr *addr; 405{ 406 register struct ifnet *ifp; 407 register struct ifaddr *ifa; 408 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 409 u_int af = addr->sa_family; 410 char *addr_data = addr->sa_data, *cplim; 411 412 /* 413 * AF_LINK addresses can be looked up directly by their index number, 414 * so do that if we can. 415 */ 416 if (af == AF_LINK) { 417 register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 418 if (sdl->sdl_index && sdl->sdl_index <= if_index) 419 return (ifnet_addrs[sdl->sdl_index - 1]); 420 } 421 422 /* 423 * Scan though each interface, looking for ones that have 424 * addresses in this address family. 425 */ 426 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_link)) { 427 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 428 ifa = TAILQ_NEXT(ifa, ifa_link)) { 429 register char *cp, *cp2, *cp3; 430 431 if (ifa->ifa_addr->sa_family != af) 432next: continue; 433 if ( 434#ifdef INET6 /* XXX: for maching gif tunnel dst as routing entry gateway */ 435 addr->sa_family != AF_INET6 && 436#endif 437 ifp->if_flags & IFF_POINTOPOINT) { 438 /* 439 * This is a bit broken as it doesn't 440 * take into account that the remote end may 441 * be a single node in the network we are 442 * looking for. 443 * The trouble is that we don't know the 444 * netmask for the remote end. 445 */ 446 if (ifa->ifa_dstaddr != 0 447 && equal(addr, ifa->ifa_dstaddr)) 448 return (ifa); 449 } else { 450 /* 451 * if we have a special address handler, 452 * then use it instead of the generic one. 453 */ 454 if (ifa->ifa_claim_addr) { 455 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 456 return (ifa); 457 } else { 458 continue; 459 } 460 } 461 462 /* 463 * Scan all the bits in the ifa's address. 464 * If a bit dissagrees with what we are 465 * looking for, mask it with the netmask 466 * to see if it really matters. 467 * (A byte at a time) 468 */ 469 if (ifa->ifa_netmask == 0) 470 continue; 471 cp = addr_data; 472 cp2 = ifa->ifa_addr->sa_data; 473 cp3 = ifa->ifa_netmask->sa_data; 474 cplim = ifa->ifa_netmask->sa_len 475 + (char *)ifa->ifa_netmask; 476 while (cp3 < cplim) 477 if ((*cp++ ^ *cp2++) & *cp3++) 478 goto next; /* next address! */ 479 /* 480 * If the netmask of what we just found 481 * is more specific than what we had before 482 * (if we had one) then remember the new one 483 * before continuing to search 484 * for an even better one. 485 */ 486 if (ifa_maybe == 0 || 487 rn_refines((caddr_t)ifa->ifa_netmask, 488 (caddr_t)ifa_maybe->ifa_netmask)) 489 ifa_maybe = ifa; 490 } 491 } 492 } 493 return (ifa_maybe); 494} 495 496/* 497 * Find an interface address specific to an interface best matching 498 * a given address. 499 */ 500struct ifaddr * 501ifaof_ifpforaddr(addr, ifp) 502 struct sockaddr *addr; 503 register struct ifnet *ifp; 504{ 505 register struct ifaddr *ifa; 506 register char *cp, *cp2, *cp3; 507 register char *cplim; 508 struct ifaddr *ifa_maybe = 0; 509 u_int af = addr->sa_family; 510 511 if (af >= AF_MAX) 512 return (0); 513 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 514 ifa = TAILQ_NEXT(ifa, ifa_link)) { 515 if (ifa->ifa_addr->sa_family != af) 516 continue; 517 if (ifa_maybe == 0) 518 ifa_maybe = ifa; 519 if (ifa->ifa_netmask == 0) { 520 if (equal(addr, ifa->ifa_addr) || 521 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 522 return (ifa); 523 continue; 524 } 525 if (ifp->if_flags & IFF_POINTOPOINT) { 526 if (equal(addr, ifa->ifa_dstaddr)) 527 return (ifa); 528 } else { 529 cp = addr->sa_data; 530 cp2 = ifa->ifa_addr->sa_data; 531 cp3 = ifa->ifa_netmask->sa_data; 532 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 533 for (; cp3 < cplim; cp3++) 534 if ((*cp++ ^ *cp2++) & *cp3) 535 break; 536 if (cp3 == cplim) 537 return (ifa); 538 } 539 } 540 return (ifa_maybe); 541} 542 543#include <net/route.h> 544 545/* 546 * Default action when installing a route with a Link Level gateway. 547 * Lookup an appropriate real ifa to point to. 548 * This should be moved to /sys/net/link.c eventually. 549 */ 550static void 551link_rtrequest(cmd, rt, sa) 552 int cmd; 553 register struct rtentry *rt; 554 struct sockaddr *sa; 555{ 556 register struct ifaddr *ifa; 557 struct sockaddr *dst; 558 struct ifnet *ifp; 559 560 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 561 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 562 return; 563 ifa = ifaof_ifpforaddr(dst, ifp); 564 if (ifa) { 565 IFAFREE(rt->rt_ifa); 566 rt->rt_ifa = ifa; 567 ifa->ifa_refcnt++; 568 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 569 ifa->ifa_rtrequest(cmd, rt, sa); 570 } 571} 572 573/* 574 * Mark an interface down and notify protocols of 575 * the transition. 576 * NOTE: must be called at splnet or eqivalent. 577 */ 578void 579if_unroute(ifp, flag, fam) 580 register struct ifnet *ifp; 581 int flag, fam; 582{ 583 register struct ifaddr *ifa; 584 585 ifp->if_flags &= ~flag; 586 getmicrotime(&ifp->if_lastchange); 587 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 588 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 589 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 590 if_qflush(&ifp->if_snd); 591 rt_ifmsg(ifp); 592} 593 594/* 595 * Mark an interface up and notify protocols of 596 * the transition. 597 * NOTE: must be called at splnet or eqivalent. 598 */ 599void 600if_route(ifp, flag, fam) 601 register struct ifnet *ifp; 602 int flag, fam; 603{ 604 register struct ifaddr *ifa; 605 606 ifp->if_flags |= flag; 607 getmicrotime(&ifp->if_lastchange); 608 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 609 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 610 pfctlinput(PRC_IFUP, ifa->ifa_addr); 611 rt_ifmsg(ifp); 612#ifdef INET6 613 in6_if_up(ifp); 614#endif 615} 616 617/* 618 * Mark an interface down and notify protocols of 619 * the transition. 620 * NOTE: must be called at splnet or eqivalent. 621 */ 622void 623if_down(ifp) 624 register struct ifnet *ifp; 625{ 626 627 if_unroute(ifp, IFF_UP, AF_UNSPEC); 628} 629 630/* 631 * Mark an interface up and notify protocols of 632 * the transition. 633 * NOTE: must be called at splnet or eqivalent. 634 */ 635void 636if_up(ifp) 637 register struct ifnet *ifp; 638{ 639 640 if_route(ifp, IFF_UP, AF_UNSPEC); 641} 642 643/* 644 * Flush an interface queue. 645 */ 646static void 647if_qflush(ifq) 648 register struct ifqueue *ifq; 649{ 650 register struct mbuf *m, *n; 651 652 n = ifq->ifq_head; 653 while ((m = n) != 0) { 654 n = m->m_act; 655 m_freem(m); 656 } 657 ifq->ifq_head = 0; 658 ifq->ifq_tail = 0; 659 ifq->ifq_len = 0; 660} 661 662/* 663 * Handle interface watchdog timer routines. Called 664 * from softclock, we decrement timers (if set) and 665 * call the appropriate interface routine on expiration. 666 */ 667static void 668if_slowtimo(arg) 669 void *arg; 670{ 671 register struct ifnet *ifp; 672 int s = splimp(); 673 674 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_link)) { 675 if (ifp->if_timer == 0 || --ifp->if_timer) 676 continue; 677 if (ifp->if_watchdog) 678 (*ifp->if_watchdog)(ifp); 679 } 680 splx(s); 681 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 682} 683 684/* 685 * Map interface name to 686 * interface structure pointer. 687 */ 688struct ifnet * 689ifunit(char *name) 690{ 691 char namebuf[IFNAMSIZ + 1]; 692 char *cp; 693 struct ifnet *ifp; 694 int unit; 695 unsigned len, m; 696 char c; 697 698 len = strlen(name); 699 if (len < 2 || len > IFNAMSIZ) 700 return NULL; 701 cp = name + len - 1; 702 c = *cp; 703 if (c < '0' || c > '9') 704 return NULL; /* trailing garbage */ 705 unit = 0; 706 m = 1; 707 do { 708 if (cp == name) 709 return NULL; /* no interface name */ 710 unit += (c - '0') * m; 711 if (unit > 1000000) 712 return NULL; /* number is unreasonable */ 713 m *= 10; 714 c = *--cp; 715 } while (c >= '0' && c <= '9'); 716 len = cp - name + 1; 717 bcopy(name, namebuf, len); 718 namebuf[len] = '\0'; 719 /* 720 * Now search all the interfaces for this name/number 721 */ 722 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_link)) { 723 if (strcmp(ifp->if_name, namebuf)) 724 continue; 725 if (unit == ifp->if_unit) 726 break; 727 } 728 return (ifp); 729} 730 731 732/* 733 * Map interface name in a sockaddr_dl to 734 * interface structure pointer. 735 */ 736struct ifnet * 737if_withname(sa) 738 struct sockaddr *sa; 739{ 740 char ifname[IFNAMSIZ+1]; 741 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 742 743 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 744 (sdl->sdl_nlen > IFNAMSIZ) ) 745 return NULL; 746 747 /* 748 * ifunit wants a null-terminated name. It may not be null-terminated 749 * in the sockaddr. We don't want to change the caller's sockaddr, 750 * and there might not be room to put the trailing null anyway, so we 751 * make a local copy that we know we can null terminate safely. 752 */ 753 754 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 755 ifname[sdl->sdl_nlen] = '\0'; 756 return ifunit(ifname); 757} 758 759 760/* 761 * Interface ioctls. 762 */ 763int 764ifioctl(so, cmd, data, p) 765 struct socket *so; 766 u_long cmd; 767 caddr_t data; 768 struct proc *p; 769{ 770 register struct ifnet *ifp; 771 register struct ifreq *ifr; 772 struct ifstat *ifs; 773 int error; 774 short oif_flags; 775 776 switch (cmd) { 777 778 case SIOCGIFCONF: 779 case OSIOCGIFCONF: 780 return (ifconf(cmd, data)); 781 } 782 ifr = (struct ifreq *)data; 783 ifp = ifunit(ifr->ifr_name); 784 if (ifp == 0) 785 return (ENXIO); 786 switch (cmd) { 787 788 case SIOCGIFFLAGS: 789 ifr->ifr_flags = ifp->if_flags; 790 break; 791 792 case SIOCGIFMETRIC: 793 ifr->ifr_metric = ifp->if_metric; 794 break; 795 796 case SIOCGIFMTU: 797 ifr->ifr_mtu = ifp->if_mtu; 798 break; 799 800 case SIOCGIFPHYS: 801 ifr->ifr_phys = ifp->if_physical; 802 break; 803 804 case SIOCSIFFLAGS: 805 error = suser(p); 806 if (error) 807 return (error); 808 ifr->ifr_prevflags = ifp->if_flags; 809 if (ifp->if_flags & IFF_SMART) { 810 /* Smart drivers twiddle their own routes */ 811 } else if (ifp->if_flags & IFF_UP && 812 (ifr->ifr_flags & IFF_UP) == 0) { 813 int s = splimp(); 814 if_down(ifp); 815 splx(s); 816 } else if (ifr->ifr_flags & IFF_UP && 817 (ifp->if_flags & IFF_UP) == 0) { 818 int s = splimp(); 819 if_up(ifp); 820 splx(s); 821 } 822 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 823 (ifr->ifr_flags &~ IFF_CANTCHANGE); 824 if (ifp->if_ioctl) 825 (void) (*ifp->if_ioctl)(ifp, cmd, data); 826 getmicrotime(&ifp->if_lastchange); 827 break; 828 829 case SIOCSIFMETRIC: 830 error = suser(p); 831 if (error) 832 return (error); 833 ifp->if_metric = ifr->ifr_metric; 834 getmicrotime(&ifp->if_lastchange); 835 break; 836 837 case SIOCSIFPHYS: 838 error = suser(p); 839 if (error) 840 return error; 841 if (!ifp->if_ioctl) 842 return EOPNOTSUPP; 843 error = (*ifp->if_ioctl)(ifp, cmd, data); 844 if (error == 0) 845 getmicrotime(&ifp->if_lastchange); 846 return(error); 847 848 case SIOCSIFMTU: 849 { 850 u_long oldmtu = ifp->if_mtu; 851 852 error = suser(p); 853 if (error) 854 return (error); 855 if (ifp->if_ioctl == NULL) 856 return (EOPNOTSUPP); 857 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 858 return (EINVAL); 859 error = (*ifp->if_ioctl)(ifp, cmd, data); 860 if (error == 0) { 861 getmicrotime(&ifp->if_lastchange); 862 rt_ifmsg(ifp); 863 } 864 /* 865 * If the link MTU changed, do network layer specific procedure. 866 */ 867 if (ifp->if_mtu != oldmtu) { 868#ifdef INET6 869 nd6_setmtu(ifp); 870#endif 871 } 872 return (error); 873 } 874 875 case SIOCADDMULTI: 876 case SIOCDELMULTI: 877 error = suser(p); 878 if (error) 879 return (error); 880 881 /* Don't allow group membership on non-multicast interfaces. */ 882 if ((ifp->if_flags & IFF_MULTICAST) == 0) 883 return EOPNOTSUPP; 884 885 /* Don't let users screw up protocols' entries. */ 886 if (ifr->ifr_addr.sa_family != AF_LINK) 887 return EINVAL; 888 889 if (cmd == SIOCADDMULTI) { 890 struct ifmultiaddr *ifma; 891 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 892 } else { 893 error = if_delmulti(ifp, &ifr->ifr_addr); 894 } 895 if (error == 0) 896 getmicrotime(&ifp->if_lastchange); 897 return error; 898 899 case SIOCSIFPHYADDR: 900 case SIOCDIFPHYADDR: 901#ifdef INET6 902 case SIOCSIFPHYADDR_IN6: 903#endif 904 case SIOCSIFMEDIA: 905 case SIOCSIFGENERIC: 906 error = suser(p); 907 if (error) 908 return (error); 909 if (ifp->if_ioctl == 0) 910 return (EOPNOTSUPP); 911 error = (*ifp->if_ioctl)(ifp, cmd, data); 912 if (error == 0) 913 getmicrotime(&ifp->if_lastchange); 914 return error; 915 916 case SIOCGIFSTATUS: 917 ifs = (struct ifstat *)data; 918 ifs->ascii[0] = '\0'; 919 920 case SIOCGIFMEDIA: 921 case SIOCGIFGENERIC: 922 if (ifp->if_ioctl == 0) 923 return (EOPNOTSUPP); 924 return ((*ifp->if_ioctl)(ifp, cmd, data)); 925 926 case SIOCSIFLLADDR: 927 error = suser(p); 928 if (error) 929 return (error); 930 return if_setlladdr(ifp, 931 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 932 933 default: 934 oif_flags = ifp->if_flags; 935 if (so->so_proto == 0) 936 return (EOPNOTSUPP); 937#ifndef COMPAT_43 938 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 939 data, 940 ifp, p)); 941#else 942 { 943 int ocmd = cmd; 944 945 switch (cmd) { 946 947 case SIOCSIFDSTADDR: 948 case SIOCSIFADDR: 949 case SIOCSIFBRDADDR: 950 case SIOCSIFNETMASK: 951#if BYTE_ORDER != BIG_ENDIAN 952 if (ifr->ifr_addr.sa_family == 0 && 953 ifr->ifr_addr.sa_len < 16) { 954 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 955 ifr->ifr_addr.sa_len = 16; 956 } 957#else 958 if (ifr->ifr_addr.sa_len == 0) 959 ifr->ifr_addr.sa_len = 16; 960#endif 961 break; 962 963 case OSIOCGIFADDR: 964 cmd = SIOCGIFADDR; 965 break; 966 967 case OSIOCGIFDSTADDR: 968 cmd = SIOCGIFDSTADDR; 969 break; 970 971 case OSIOCGIFBRDADDR: 972 cmd = SIOCGIFBRDADDR; 973 break; 974 975 case OSIOCGIFNETMASK: 976 cmd = SIOCGIFNETMASK; 977 } 978 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 979 cmd, 980 data, 981 ifp, p)); 982 switch (ocmd) { 983 984 case OSIOCGIFADDR: 985 case OSIOCGIFDSTADDR: 986 case OSIOCGIFBRDADDR: 987 case OSIOCGIFNETMASK: 988 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 989 990 } 991 } 992#endif /* COMPAT_43 */ 993 994 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 995#ifdef INET6 996 DELAY(100);/* XXX: temporal workaround for fxp issue*/ 997 if (ifp->if_flags & IFF_UP) { 998 int s = splimp(); 999 in6_if_up(ifp); 1000 splx(s); 1001 } 1002#endif 1003 } 1004 return (error); 1005 1006 } 1007 return (0); 1008} 1009 1010/* 1011 * Set/clear promiscuous mode on interface ifp based on the truth value 1012 * of pswitch. The calls are reference counted so that only the first 1013 * "on" request actually has an effect, as does the final "off" request. 1014 * Results are undefined if the "off" and "on" requests are not matched. 1015 */ 1016int 1017ifpromisc(ifp, pswitch) 1018 struct ifnet *ifp; 1019 int pswitch; 1020{ 1021 struct ifreq ifr; 1022 int error; 1023 1024 if (pswitch) { 1025 /* 1026 * If the device is not configured up, we cannot put it in 1027 * promiscuous mode. 1028 */ 1029 if ((ifp->if_flags & IFF_UP) == 0) 1030 return (ENETDOWN); 1031 if (ifp->if_pcount++ != 0) 1032 return (0); 1033 ifp->if_flags |= IFF_PROMISC; 1034 log(LOG_INFO, "%s%d: promiscuous mode enabled\n", 1035 ifp->if_name, ifp->if_unit); 1036 } else { 1037 if (--ifp->if_pcount > 0) 1038 return (0); 1039 ifp->if_flags &= ~IFF_PROMISC; 1040 log(LOG_INFO, "%s%d: promiscuous mode disabled\n", 1041 ifp->if_name, ifp->if_unit); 1042 } 1043 ifr.ifr_flags = ifp->if_flags; 1044 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1045 if (error == 0) 1046 rt_ifmsg(ifp); 1047 return error; 1048} 1049 1050/* 1051 * Return interface configuration 1052 * of system. List may be used 1053 * in later ioctl's (above) to get 1054 * other information. 1055 */ 1056/*ARGSUSED*/ 1057static int 1058ifconf(cmd, data) 1059 u_long cmd; 1060 caddr_t data; 1061{ 1062 register struct ifconf *ifc = (struct ifconf *)data; 1063 register struct ifnet *ifp = TAILQ_FIRST(&ifnet); 1064 register struct ifaddr *ifa; 1065 struct ifreq ifr, *ifrp; 1066 int space = ifc->ifc_len, error = 0; 1067 1068 ifrp = ifc->ifc_req; 1069 for (; space > sizeof (ifr) && ifp; ifp = TAILQ_NEXT(ifp, if_link)) { 1070 char workbuf[64]; 1071 int ifnlen, addrs; 1072 1073 ifnlen = snprintf(workbuf, sizeof(workbuf), 1074 "%s%d", ifp->if_name, ifp->if_unit); 1075 if(ifnlen + 1 > sizeof ifr.ifr_name) { 1076 error = ENAMETOOLONG; 1077 break; 1078 } else { 1079 strcpy(ifr.ifr_name, workbuf); 1080 } 1081 1082 addrs = 0; 1083 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1084 for ( ; space > sizeof (ifr) && ifa; 1085 ifa = TAILQ_NEXT(ifa, ifa_link)) { 1086 register struct sockaddr *sa = ifa->ifa_addr; 1087 if (curproc->p_prison && prison_if(curproc, sa)) 1088 continue; 1089 addrs++; 1090#ifdef COMPAT_43 1091 if (cmd == OSIOCGIFCONF) { 1092 struct osockaddr *osa = 1093 (struct osockaddr *)&ifr.ifr_addr; 1094 ifr.ifr_addr = *sa; 1095 osa->sa_family = sa->sa_family; 1096 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1097 sizeof (ifr)); 1098 ifrp++; 1099 } else 1100#endif 1101 if (sa->sa_len <= sizeof(*sa)) { 1102 ifr.ifr_addr = *sa; 1103 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1104 sizeof (ifr)); 1105 ifrp++; 1106 } else { 1107 if (space < sizeof (ifr) + sa->sa_len - 1108 sizeof(*sa)) 1109 break; 1110 space -= sa->sa_len - sizeof(*sa); 1111 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1112 sizeof (ifr.ifr_name)); 1113 if (error == 0) 1114 error = copyout((caddr_t)sa, 1115 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 1116 ifrp = (struct ifreq *) 1117 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1118 } 1119 if (error) 1120 break; 1121 space -= sizeof (ifr); 1122 } 1123 if (error) 1124 break; 1125 if (!addrs) { 1126 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1127 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1128 sizeof (ifr)); 1129 if (error) 1130 break; 1131 space -= sizeof (ifr); 1132 ifrp++; 1133 } 1134 } 1135 ifc->ifc_len -= space; 1136 return (error); 1137} 1138 1139/* 1140 * Just like if_promisc(), but for all-multicast-reception mode. 1141 */ 1142int 1143if_allmulti(ifp, onswitch) 1144 struct ifnet *ifp; 1145 int onswitch; 1146{ 1147 int error = 0; 1148 int s = splimp(); 1149 1150 if (onswitch) { 1151 if (ifp->if_amcount++ == 0) { 1152 ifp->if_flags |= IFF_ALLMULTI; 1153 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0); 1154 } 1155 } else { 1156 if (ifp->if_amcount > 1) { 1157 ifp->if_amcount--; 1158 } else { 1159 ifp->if_amcount = 0; 1160 ifp->if_flags &= ~IFF_ALLMULTI; 1161 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0); 1162 } 1163 } 1164 splx(s); 1165 1166 if (error == 0) 1167 rt_ifmsg(ifp); 1168 return error; 1169} 1170 1171/* 1172 * Add a multicast listenership to the interface in question. 1173 * The link layer provides a routine which converts 1174 */ 1175int 1176if_addmulti(ifp, sa, retifma) 1177 struct ifnet *ifp; /* interface to manipulate */ 1178 struct sockaddr *sa; /* address to add */ 1179 struct ifmultiaddr **retifma; 1180{ 1181 struct sockaddr *llsa, *dupsa; 1182 int error, s; 1183 struct ifmultiaddr *ifma; 1184 1185 /* 1186 * If the matching multicast address already exists 1187 * then don't add a new one, just add a reference 1188 */ 1189 for (ifma = LIST_FIRST(&ifp->if_multiaddrs); ifma; 1190 ifma = LIST_NEXT(ifma, ifma_link)) { 1191 if (equal(sa, ifma->ifma_addr)) { 1192 ifma->ifma_refcount++; 1193 if (retifma) 1194 *retifma = ifma; 1195 return 0; 1196 } 1197 } 1198 1199 /* 1200 * Give the link layer a chance to accept/reject it, and also 1201 * find out which AF_LINK address this maps to, if it isn't one 1202 * already. 1203 */ 1204 if (ifp->if_resolvemulti) { 1205 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1206 if (error) return error; 1207 } else { 1208 llsa = 0; 1209 } 1210 1211 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1212 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1213 bcopy(sa, dupsa, sa->sa_len); 1214 1215 ifma->ifma_addr = dupsa; 1216 ifma->ifma_lladdr = llsa; 1217 ifma->ifma_ifp = ifp; 1218 ifma->ifma_refcount = 1; 1219 ifma->ifma_protospec = 0; 1220 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1221 1222 /* 1223 * Some network interfaces can scan the address list at 1224 * interrupt time; lock them out. 1225 */ 1226 s = splimp(); 1227 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1228 splx(s); 1229 *retifma = ifma; 1230 1231 if (llsa != 0) { 1232 for (ifma = LIST_FIRST(&ifp->if_multiaddrs); ifma; 1233 ifma = LIST_NEXT(ifma, ifma_link)) { 1234 if (equal(ifma->ifma_addr, llsa)) 1235 break; 1236 } 1237 if (ifma) { 1238 ifma->ifma_refcount++; 1239 } else { 1240 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1241 M_IFMADDR, M_WAITOK); 1242 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1243 M_IFMADDR, M_WAITOK); 1244 bcopy(llsa, dupsa, llsa->sa_len); 1245 ifma->ifma_addr = dupsa; 1246 ifma->ifma_ifp = ifp; 1247 ifma->ifma_refcount = 1; 1248 s = splimp(); 1249 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1250 splx(s); 1251 } 1252 } 1253 /* 1254 * We are certain we have added something, so call down to the 1255 * interface to let them know about it. 1256 */ 1257 s = splimp(); 1258 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1259 splx(s); 1260 1261 return 0; 1262} 1263 1264/* 1265 * Remove a reference to a multicast address on this interface. Yell 1266 * if the request does not match an existing membership. 1267 */ 1268int 1269if_delmulti(ifp, sa) 1270 struct ifnet *ifp; 1271 struct sockaddr *sa; 1272{ 1273 struct ifmultiaddr *ifma; 1274 int s; 1275 1276 for (ifma = LIST_FIRST(&ifp->if_multiaddrs); ifma; 1277 ifma = LIST_NEXT(ifma, ifma_link)) 1278 if (equal(sa, ifma->ifma_addr)) 1279 break; 1280 if (ifma == 0) 1281 return ENOENT; 1282 1283 if (ifma->ifma_refcount > 1) { 1284 ifma->ifma_refcount--; 1285 return 0; 1286 } 1287 1288 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1289 sa = ifma->ifma_lladdr; 1290 s = splimp(); 1291 LIST_REMOVE(ifma, ifma_link); 1292 splx(s); 1293 free(ifma->ifma_addr, M_IFMADDR); 1294 free(ifma, M_IFMADDR); 1295 if (sa == 0) 1296 return 0; 1297 1298 /* 1299 * Now look for the link-layer address which corresponds to 1300 * this network address. It had been squirreled away in 1301 * ifma->ifma_lladdr for this purpose (so we don't have 1302 * to call ifp->if_resolvemulti() again), and we saved that 1303 * value in sa above. If some nasty deleted the 1304 * link-layer address out from underneath us, we can deal because 1305 * the address we stored was is not the same as the one which was 1306 * in the record for the link-layer address. (So we don't complain 1307 * in that case.) 1308 */ 1309 for (ifma = LIST_FIRST(&ifp->if_multiaddrs); ifma; 1310 ifma = LIST_NEXT(ifma, ifma_link)) 1311 if (equal(sa, ifma->ifma_addr)) 1312 break; 1313 if (ifma == 0) 1314 return 0; 1315 1316 if (ifma->ifma_refcount > 1) { 1317 ifma->ifma_refcount--; 1318 return 0; 1319 } 1320 1321 s = splimp(); 1322 LIST_REMOVE(ifma, ifma_link); 1323 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1324 splx(s); 1325 free(ifma->ifma_addr, M_IFMADDR); 1326 free(sa, M_IFMADDR); 1327 free(ifma, M_IFMADDR); 1328 1329 return 0; 1330} 1331 1332/* 1333 * Set the link layer address on an interface. 1334 * 1335 * At this time we only support certain types of interfaces, 1336 * and we don't allow the length of the address to change. 1337 */ 1338int 1339if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1340{ 1341 struct sockaddr_dl *sdl; 1342 struct ifaddr *ifa; 1343 1344 ifa = ifnet_addrs[ifp->if_index - 1]; 1345 if (ifa == NULL) 1346 return (EINVAL); 1347 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1348 if (sdl == NULL) 1349 return (EINVAL); 1350 if (len != sdl->sdl_alen) /* don't allow length to change */ 1351 return (EINVAL); 1352 switch (ifp->if_type) { 1353 case IFT_ETHER: /* these types use struct arpcom */ 1354 case IFT_FDDI: 1355 case IFT_XETHER: 1356 case IFT_ISO88025: 1357 case IFT_PROPVIRTUAL: /* XXX waiting for IFT_8021_VLAN */ 1358 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1359 bcopy(lladdr, LLADDR(sdl), len); 1360 break; 1361 default: 1362 return (ENODEV); 1363 } 1364 /* 1365 * If the interface is already up, we need 1366 * to re-init it in order to reprogram its 1367 * address filter. 1368 */ 1369 if ((ifp->if_flags & IFF_UP) != 0) { 1370 ifp->if_flags &= ~IFF_UP; 1371 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL); 1372 ifp->if_flags |= IFF_UP; 1373 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL); 1374 } 1375 return (0); 1376} 1377 1378struct ifmultiaddr * 1379ifmaof_ifpforaddr(sa, ifp) 1380 struct sockaddr *sa; 1381 struct ifnet *ifp; 1382{ 1383 struct ifmultiaddr *ifma; 1384 1385 for (ifma = LIST_FIRST(&ifp->if_multiaddrs); ifma; 1386 ifma = LIST_NEXT(ifma, ifma_link)) 1387 if (equal(ifma->ifma_addr, sa)) 1388 break; 1389 1390 return ifma; 1391} 1392 1393SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1394SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 1395