if.c revision 78064
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 78064 2001-06-11 12:39:29Z ume $ 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#include <sys/jail.h> 54 55#include <net/if.h> 56#include <net/if_arp.h> 57#include <net/if_dl.h> 58#include <net/if_types.h> 59#include <net/radix.h> 60#include <net/route.h> 61 62#if defined(INET) || defined(INET6) 63/*XXX*/ 64#include <netinet/in.h> 65#include <netinet/in_var.h> 66#ifdef INET6 67#include <netinet6/in6_var.h> 68#include <netinet6/in6_ifattach.h> 69#endif 70#endif 71 72/* 73 * System initialization 74 */ 75 76static int ifconf __P((u_long, caddr_t)); 77static void ifinit __P((void *)); 78static void if_qflush __P((struct ifqueue *)); 79static void if_slowtimo __P((void *)); 80static void link_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 81static int if_rtdel __P((struct radix_node *, void *)); 82 83SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL) 84 85MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 86MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 87 88int ifqmaxlen = IFQ_MAXLEN; 89struct ifnethead ifnet; /* depend on static init XXX */ 90 91#ifdef INET6 92/* 93 * XXX: declare here to avoid to include many inet6 related files.. 94 * should be more generalized? 95 */ 96extern void nd6_setmtu __P((struct ifnet *)); 97#endif 98 99/* 100 * Network interface utility routines. 101 * 102 * Routines with ifa_ifwith* names take sockaddr *'s as 103 * parameters. 104 */ 105/* ARGSUSED*/ 106void 107ifinit(dummy) 108 void *dummy; 109{ 110 struct ifnet *ifp; 111 int s; 112 113 s = splimp(); 114 TAILQ_FOREACH(ifp, &ifnet, if_link) { 115 if (ifp->if_snd.ifq_maxlen == 0) { 116 printf("%s%d XXX: driver didn't set ifq_maxlen\n", 117 ifp->if_name, ifp->if_unit); 118 ifp->if_snd.ifq_maxlen = ifqmaxlen; 119 } 120 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 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 TAILQ_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); 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#ifdef INET6 282 /* 283 * Remove all IPv6 kernel structs related to ifp. This should be done 284 * before removing routing entries below, since IPv6 interface direct 285 * routes are expected to be removed by the IPv6-specific kernel API. 286 * Otherwise, the kernel will detect some inconsistency and bark it. 287 */ 288 in6_ifdetach(ifp); 289#endif 290 291 /* 292 * Delete all remaining routes using this interface 293 * Unfortuneatly the only way to do this is to slog through 294 * the entire routing table looking for routes which point 295 * to this interface...oh well... 296 */ 297 for (i = 1; i <= AF_MAX; i++) { 298 if ((rnh = rt_tables[i]) == NULL) 299 continue; 300 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 301 } 302 303 TAILQ_REMOVE(&ifnet, ifp, if_link); 304 mtx_destroy(&ifp->if_snd.ifq_mtx); 305 splx(s); 306} 307 308/* 309 * Delete Routes for a Network Interface 310 * 311 * Called for each routing entry via the rnh->rnh_walktree() call above 312 * to delete all route entries referencing a detaching network interface. 313 * 314 * Arguments: 315 * rn pointer to node in the routing table 316 * arg argument passed to rnh->rnh_walktree() - detaching interface 317 * 318 * Returns: 319 * 0 successful 320 * errno failed - reason indicated 321 * 322 */ 323static int 324if_rtdel(rn, arg) 325 struct radix_node *rn; 326 void *arg; 327{ 328 struct rtentry *rt = (struct rtentry *)rn; 329 struct ifnet *ifp = arg; 330 int err; 331 332 if (rt->rt_ifp == ifp) { 333 334 /* 335 * Protect (sorta) against walktree recursion problems 336 * with cloned routes 337 */ 338 if ((rt->rt_flags & RTF_UP) == 0) 339 return (0); 340 341 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 342 rt_mask(rt), rt->rt_flags, 343 (struct rtentry **) NULL); 344 if (err) { 345 log(LOG_WARNING, "if_rtdel: error %d\n", err); 346 } 347 } 348 349 return (0); 350} 351 352/* 353 * Locate an interface based on a complete address. 354 */ 355/*ARGSUSED*/ 356struct ifaddr * 357ifa_ifwithaddr(addr) 358 register struct sockaddr *addr; 359{ 360 register struct ifnet *ifp; 361 register struct ifaddr *ifa; 362 363#define equal(a1, a2) \ 364 (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0) 365 TAILQ_FOREACH(ifp, &ifnet, if_link) 366 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 367 if (ifa->ifa_addr->sa_family != addr->sa_family) 368 continue; 369 if (equal(addr, ifa->ifa_addr)) 370 return (ifa); 371 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && 372 /* IP6 doesn't have broadcast */ 373 ifa->ifa_broadaddr->sa_len != 0 && 374 equal(ifa->ifa_broadaddr, addr)) 375 return (ifa); 376 } 377 return ((struct ifaddr *)0); 378} 379/* 380 * Locate the point to point interface with a given destination address. 381 */ 382/*ARGSUSED*/ 383struct ifaddr * 384ifa_ifwithdstaddr(addr) 385 register struct sockaddr *addr; 386{ 387 register struct ifnet *ifp; 388 register struct ifaddr *ifa; 389 390 TAILQ_FOREACH(ifp, &ifnet, if_link) 391 if (ifp->if_flags & IFF_POINTOPOINT) 392 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 393 if (ifa->ifa_addr->sa_family != addr->sa_family) 394 continue; 395 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 396 return (ifa); 397 } 398 return ((struct ifaddr *)0); 399} 400 401/* 402 * Find an interface on a specific network. If many, choice 403 * is most specific found. 404 */ 405struct ifaddr * 406ifa_ifwithnet(addr) 407 struct sockaddr *addr; 408{ 409 register struct ifnet *ifp; 410 register struct ifaddr *ifa; 411 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 412 u_int af = addr->sa_family; 413 char *addr_data = addr->sa_data, *cplim; 414 415 /* 416 * AF_LINK addresses can be looked up directly by their index number, 417 * so do that if we can. 418 */ 419 if (af == AF_LINK) { 420 register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 421 if (sdl->sdl_index && sdl->sdl_index <= if_index) 422 return (ifnet_addrs[sdl->sdl_index - 1]); 423 } 424 425 /* 426 * Scan though each interface, looking for ones that have 427 * addresses in this address family. 428 */ 429 TAILQ_FOREACH(ifp, &ifnet, if_link) { 430 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 431 register char *cp, *cp2, *cp3; 432 433 if (ifa->ifa_addr->sa_family != af) 434next: continue; 435 if ( 436#ifdef INET6 /* XXX: for maching gif tunnel dst as routing entry gateway */ 437 addr->sa_family != AF_INET6 && 438#endif 439 ifp->if_flags & IFF_POINTOPOINT) { 440 /* 441 * This is a bit broken as it doesn't 442 * take into account that the remote end may 443 * be a single node in the network we are 444 * looking for. 445 * The trouble is that we don't know the 446 * netmask for the remote end. 447 */ 448 if (ifa->ifa_dstaddr != 0 449 && equal(addr, ifa->ifa_dstaddr)) 450 return (ifa); 451 } else { 452 /* 453 * if we have a special address handler, 454 * then use it instead of the generic one. 455 */ 456 if (ifa->ifa_claim_addr) { 457 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 458 return (ifa); 459 } else { 460 continue; 461 } 462 } 463 464 /* 465 * Scan all the bits in the ifa's address. 466 * If a bit dissagrees with what we are 467 * looking for, mask it with the netmask 468 * to see if it really matters. 469 * (A byte at a time) 470 */ 471 if (ifa->ifa_netmask == 0) 472 continue; 473 cp = addr_data; 474 cp2 = ifa->ifa_addr->sa_data; 475 cp3 = ifa->ifa_netmask->sa_data; 476 cplim = ifa->ifa_netmask->sa_len 477 + (char *)ifa->ifa_netmask; 478 while (cp3 < cplim) 479 if ((*cp++ ^ *cp2++) & *cp3++) 480 goto next; /* next address! */ 481 /* 482 * If the netmask of what we just found 483 * is more specific than what we had before 484 * (if we had one) then remember the new one 485 * before continuing to search 486 * for an even better one. 487 */ 488 if (ifa_maybe == 0 || 489 rn_refines((caddr_t)ifa->ifa_netmask, 490 (caddr_t)ifa_maybe->ifa_netmask)) 491 ifa_maybe = ifa; 492 } 493 } 494 } 495 return (ifa_maybe); 496} 497 498/* 499 * Find an interface address specific to an interface best matching 500 * a given address. 501 */ 502struct ifaddr * 503ifaof_ifpforaddr(addr, ifp) 504 struct sockaddr *addr; 505 register struct ifnet *ifp; 506{ 507 register struct ifaddr *ifa; 508 register char *cp, *cp2, *cp3; 509 register char *cplim; 510 struct ifaddr *ifa_maybe = 0; 511 u_int af = addr->sa_family; 512 513 if (af >= AF_MAX) 514 return (0); 515 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 516 if (ifa->ifa_addr->sa_family != af) 517 continue; 518 if (ifa_maybe == 0) 519 ifa_maybe = ifa; 520 if (ifa->ifa_netmask == 0) { 521 if (equal(addr, ifa->ifa_addr) || 522 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 523 return (ifa); 524 continue; 525 } 526 if (ifp->if_flags & IFF_POINTOPOINT) { 527 if (equal(addr, ifa->ifa_dstaddr)) 528 return (ifa); 529 } else { 530 cp = addr->sa_data; 531 cp2 = ifa->ifa_addr->sa_data; 532 cp3 = ifa->ifa_netmask->sa_data; 533 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 534 for (; cp3 < cplim; cp3++) 535 if ((*cp++ ^ *cp2++) & *cp3) 536 break; 537 if (cp3 == cplim) 538 return (ifa); 539 } 540 } 541 return (ifa_maybe); 542} 543 544#include <net/route.h> 545 546/* 547 * Default action when installing a route with a Link Level gateway. 548 * Lookup an appropriate real ifa to point to. 549 * This should be moved to /sys/net/link.c eventually. 550 */ 551static void 552link_rtrequest(cmd, rt, sa) 553 int cmd; 554 register struct rtentry *rt; 555 struct sockaddr *sa; 556{ 557 register struct ifaddr *ifa; 558 struct sockaddr *dst; 559 struct ifnet *ifp; 560 561 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 562 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 563 return; 564 ifa = ifaof_ifpforaddr(dst, ifp); 565 if (ifa) { 566 IFAFREE(rt->rt_ifa); 567 rt->rt_ifa = ifa; 568 ifa->ifa_refcnt++; 569 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 570 ifa->ifa_rtrequest(cmd, rt, sa); 571 } 572} 573 574/* 575 * Mark an interface down and notify protocols of 576 * the transition. 577 * NOTE: must be called at splnet or eqivalent. 578 */ 579void 580if_unroute(ifp, flag, fam) 581 register struct ifnet *ifp; 582 int flag, fam; 583{ 584 register struct ifaddr *ifa; 585 586 ifp->if_flags &= ~flag; 587 getmicrotime(&ifp->if_lastchange); 588 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 589 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 590 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 591 if_qflush(&ifp->if_snd); 592 rt_ifmsg(ifp); 593} 594 595/* 596 * Mark an interface up and notify protocols of 597 * the transition. 598 * NOTE: must be called at splnet or eqivalent. 599 */ 600void 601if_route(ifp, flag, fam) 602 register struct ifnet *ifp; 603 int flag, fam; 604{ 605 register struct ifaddr *ifa; 606 607 ifp->if_flags |= flag; 608 getmicrotime(&ifp->if_lastchange); 609 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 610 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 611 pfctlinput(PRC_IFUP, ifa->ifa_addr); 612 rt_ifmsg(ifp); 613#ifdef INET6 614 in6_if_up(ifp); 615#endif 616} 617 618/* 619 * Mark an interface down and notify protocols of 620 * the transition. 621 * NOTE: must be called at splnet or eqivalent. 622 */ 623void 624if_down(ifp) 625 register struct ifnet *ifp; 626{ 627 628 if_unroute(ifp, IFF_UP, AF_UNSPEC); 629} 630 631/* 632 * Mark an interface up and notify protocols of 633 * the transition. 634 * NOTE: must be called at splnet or eqivalent. 635 */ 636void 637if_up(ifp) 638 register struct ifnet *ifp; 639{ 640 641 if_route(ifp, IFF_UP, AF_UNSPEC); 642} 643 644/* 645 * Flush an interface queue. 646 */ 647static void 648if_qflush(ifq) 649 register struct ifqueue *ifq; 650{ 651 register struct mbuf *m, *n; 652 653 n = ifq->ifq_head; 654 while ((m = n) != 0) { 655 n = m->m_act; 656 m_freem(m); 657 } 658 ifq->ifq_head = 0; 659 ifq->ifq_tail = 0; 660 ifq->ifq_len = 0; 661} 662 663/* 664 * Handle interface watchdog timer routines. Called 665 * from softclock, we decrement timers (if set) and 666 * call the appropriate interface routine on expiration. 667 */ 668static void 669if_slowtimo(arg) 670 void *arg; 671{ 672 register struct ifnet *ifp; 673 int s = splimp(); 674 675 TAILQ_FOREACH(ifp, &ifnet, if_link) { 676 if (ifp->if_timer == 0 || --ifp->if_timer) 677 continue; 678 if (ifp->if_watchdog) 679 (*ifp->if_watchdog)(ifp); 680 } 681 splx(s); 682 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 683} 684 685/* 686 * Map interface name to 687 * interface structure pointer. 688 */ 689struct ifnet * 690ifunit(char *name) 691{ 692 char namebuf[IFNAMSIZ + 1]; 693 char *cp; 694 struct ifnet *ifp; 695 int unit; 696 unsigned len, m; 697 char c; 698 699 len = strlen(name); 700 if (len < 2 || len > IFNAMSIZ) 701 return NULL; 702 cp = name + len - 1; 703 c = *cp; 704 if (c < '0' || c > '9') 705 return NULL; /* trailing garbage */ 706 unit = 0; 707 m = 1; 708 do { 709 if (cp == name) 710 return NULL; /* no interface name */ 711 unit += (c - '0') * m; 712 if (unit > 1000000) 713 return NULL; /* number is unreasonable */ 714 m *= 10; 715 c = *--cp; 716 } while (c >= '0' && c <= '9'); 717 len = cp - name + 1; 718 bcopy(name, namebuf, len); 719 namebuf[len] = '\0'; 720 /* 721 * Now search all the interfaces for this name/number 722 */ 723 TAILQ_FOREACH(ifp, &ifnet, if_link) { 724 if (strcmp(ifp->if_name, namebuf)) 725 continue; 726 if (unit == ifp->if_unit) 727 break; 728 } 729 return (ifp); 730} 731 732 733/* 734 * Map interface name in a sockaddr_dl to 735 * interface structure pointer. 736 */ 737struct ifnet * 738if_withname(sa) 739 struct sockaddr *sa; 740{ 741 char ifname[IFNAMSIZ+1]; 742 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 743 744 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 745 (sdl->sdl_nlen > IFNAMSIZ) ) 746 return NULL; 747 748 /* 749 * ifunit wants a null-terminated name. It may not be null-terminated 750 * in the sockaddr. We don't want to change the caller's sockaddr, 751 * and there might not be room to put the trailing null anyway, so we 752 * make a local copy that we know we can null terminate safely. 753 */ 754 755 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 756 ifname[sdl->sdl_nlen] = '\0'; 757 return ifunit(ifname); 758} 759 760 761/* 762 * Interface ioctls. 763 */ 764int 765ifioctl(so, cmd, data, p) 766 struct socket *so; 767 u_long cmd; 768 caddr_t data; 769 struct proc *p; 770{ 771 register struct ifnet *ifp; 772 register struct ifreq *ifr; 773 struct ifstat *ifs; 774 int error; 775 short oif_flags; 776 777 switch (cmd) { 778 779 case SIOCGIFCONF: 780 case OSIOCGIFCONF: 781 return (ifconf(cmd, data)); 782 } 783 ifr = (struct ifreq *)data; 784 ifp = ifunit(ifr->ifr_name); 785 if (ifp == 0) 786 return (ENXIO); 787 switch (cmd) { 788 789 case SIOCGIFFLAGS: 790 ifr->ifr_flags = ifp->if_flags; 791 break; 792 793 case SIOCGIFMETRIC: 794 ifr->ifr_metric = ifp->if_metric; 795 break; 796 797 case SIOCGIFMTU: 798 ifr->ifr_mtu = ifp->if_mtu; 799 break; 800 801 case SIOCGIFPHYS: 802 ifr->ifr_phys = ifp->if_physical; 803 break; 804 805 case SIOCSIFFLAGS: 806 error = suser(p); 807 if (error) 808 return (error); 809 ifr->ifr_prevflags = ifp->if_flags; 810 if (ifp->if_flags & IFF_SMART) { 811 /* Smart drivers twiddle their own routes */ 812 } else if (ifp->if_flags & IFF_UP && 813 (ifr->ifr_flags & IFF_UP) == 0) { 814 int s = splimp(); 815 if_down(ifp); 816 splx(s); 817 } else if (ifr->ifr_flags & IFF_UP && 818 (ifp->if_flags & IFF_UP) == 0) { 819 int s = splimp(); 820 if_up(ifp); 821 splx(s); 822 } 823 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 824 (ifr->ifr_flags &~ IFF_CANTCHANGE); 825 if (ifp->if_ioctl) 826 (void) (*ifp->if_ioctl)(ifp, cmd, data); 827 getmicrotime(&ifp->if_lastchange); 828 break; 829 830 case SIOCSIFMETRIC: 831 error = suser(p); 832 if (error) 833 return (error); 834 ifp->if_metric = ifr->ifr_metric; 835 getmicrotime(&ifp->if_lastchange); 836 break; 837 838 case SIOCSIFPHYS: 839 error = suser(p); 840 if (error) 841 return error; 842 if (!ifp->if_ioctl) 843 return EOPNOTSUPP; 844 error = (*ifp->if_ioctl)(ifp, cmd, data); 845 if (error == 0) 846 getmicrotime(&ifp->if_lastchange); 847 return(error); 848 849 case SIOCSIFMTU: 850 { 851 u_long oldmtu = ifp->if_mtu; 852 853 error = suser(p); 854 if (error) 855 return (error); 856 if (ifp->if_ioctl == NULL) 857 return (EOPNOTSUPP); 858 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 859 return (EINVAL); 860 error = (*ifp->if_ioctl)(ifp, cmd, data); 861 if (error == 0) { 862 getmicrotime(&ifp->if_lastchange); 863 rt_ifmsg(ifp); 864 } 865 /* 866 * If the link MTU changed, do network layer specific procedure. 867 */ 868 if (ifp->if_mtu != oldmtu) { 869#ifdef INET6 870 nd6_setmtu(ifp); 871#endif 872 } 873 return (error); 874 } 875 876 case SIOCADDMULTI: 877 case SIOCDELMULTI: 878 error = suser(p); 879 if (error) 880 return (error); 881 882 /* Don't allow group membership on non-multicast interfaces. */ 883 if ((ifp->if_flags & IFF_MULTICAST) == 0) 884 return EOPNOTSUPP; 885 886 /* Don't let users screw up protocols' entries. */ 887 if (ifr->ifr_addr.sa_family != AF_LINK) 888 return EINVAL; 889 890 if (cmd == SIOCADDMULTI) { 891 struct ifmultiaddr *ifma; 892 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 893 } else { 894 error = if_delmulti(ifp, &ifr->ifr_addr); 895 } 896 if (error == 0) 897 getmicrotime(&ifp->if_lastchange); 898 return error; 899 900 case SIOCSIFPHYADDR: 901 case SIOCDIFPHYADDR: 902#ifdef INET6 903 case SIOCSIFPHYADDR_IN6: 904#endif 905 case SIOCSLIFPHYADDR: 906 case SIOCSIFMEDIA: 907 case SIOCSIFGENERIC: 908 error = suser(p); 909 if (error) 910 return (error); 911 if (ifp->if_ioctl == 0) 912 return (EOPNOTSUPP); 913 error = (*ifp->if_ioctl)(ifp, cmd, data); 914 if (error == 0) 915 getmicrotime(&ifp->if_lastchange); 916 return error; 917 918 case SIOCGIFSTATUS: 919 ifs = (struct ifstat *)data; 920 ifs->ascii[0] = '\0'; 921 922 case SIOCGIFPSRCADDR: 923 case SIOCGIFPDSTADDR: 924 case SIOCGLIFPHYADDR: 925 case SIOCGIFMEDIA: 926 case SIOCGIFGENERIC: 927 if (ifp->if_ioctl == 0) 928 return (EOPNOTSUPP); 929 return ((*ifp->if_ioctl)(ifp, cmd, data)); 930 931 case SIOCSIFLLADDR: 932 error = suser(p); 933 if (error) 934 return (error); 935 return if_setlladdr(ifp, 936 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 937 938 default: 939 oif_flags = ifp->if_flags; 940 if (so->so_proto == 0) 941 return (EOPNOTSUPP); 942#ifndef COMPAT_43 943 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 944 data, 945 ifp, p)); 946#else 947 { 948 int ocmd = cmd; 949 950 switch (cmd) { 951 952 case SIOCSIFDSTADDR: 953 case SIOCSIFADDR: 954 case SIOCSIFBRDADDR: 955 case SIOCSIFNETMASK: 956#if BYTE_ORDER != BIG_ENDIAN 957 if (ifr->ifr_addr.sa_family == 0 && 958 ifr->ifr_addr.sa_len < 16) { 959 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 960 ifr->ifr_addr.sa_len = 16; 961 } 962#else 963 if (ifr->ifr_addr.sa_len == 0) 964 ifr->ifr_addr.sa_len = 16; 965#endif 966 break; 967 968 case OSIOCGIFADDR: 969 cmd = SIOCGIFADDR; 970 break; 971 972 case OSIOCGIFDSTADDR: 973 cmd = SIOCGIFDSTADDR; 974 break; 975 976 case OSIOCGIFBRDADDR: 977 cmd = SIOCGIFBRDADDR; 978 break; 979 980 case OSIOCGIFNETMASK: 981 cmd = SIOCGIFNETMASK; 982 } 983 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 984 cmd, 985 data, 986 ifp, p)); 987 switch (ocmd) { 988 989 case OSIOCGIFADDR: 990 case OSIOCGIFDSTADDR: 991 case OSIOCGIFBRDADDR: 992 case OSIOCGIFNETMASK: 993 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 994 995 } 996 } 997#endif /* COMPAT_43 */ 998 999 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1000#ifdef INET6 1001 DELAY(100);/* XXX: temporal workaround for fxp issue*/ 1002 if (ifp->if_flags & IFF_UP) { 1003 int s = splimp(); 1004 in6_if_up(ifp); 1005 splx(s); 1006 } 1007#endif 1008 } 1009 return (error); 1010 1011 } 1012 return (0); 1013} 1014 1015/* 1016 * Set/clear promiscuous mode on interface ifp based on the truth value 1017 * of pswitch. The calls are reference counted so that only the first 1018 * "on" request actually has an effect, as does the final "off" request. 1019 * Results are undefined if the "off" and "on" requests are not matched. 1020 */ 1021int 1022ifpromisc(ifp, pswitch) 1023 struct ifnet *ifp; 1024 int pswitch; 1025{ 1026 struct ifreq ifr; 1027 int error; 1028 int oldflags, oldpcount; 1029 1030 oldpcount = ifp->if_pcount; 1031 oldflags = ifp->if_flags; 1032 if (pswitch) { 1033 /* 1034 * If the device is not configured up, we cannot put it in 1035 * promiscuous mode. 1036 */ 1037 if ((ifp->if_flags & IFF_UP) == 0) 1038 return (ENETDOWN); 1039 if (ifp->if_pcount++ != 0) 1040 return (0); 1041 ifp->if_flags |= IFF_PROMISC; 1042 } else { 1043 if (--ifp->if_pcount > 0) 1044 return (0); 1045 ifp->if_flags &= ~IFF_PROMISC; 1046 } 1047 ifr.ifr_flags = ifp->if_flags; 1048 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1049 if (error == 0) { 1050 log(LOG_INFO, "%s%d: promiscuous mode %s\n", 1051 ifp->if_name, ifp->if_unit, 1052 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1053 rt_ifmsg(ifp); 1054 } else { 1055 ifp->if_pcount = oldpcount; 1056 ifp->if_flags = oldflags; 1057 } 1058 return error; 1059} 1060 1061/* 1062 * Return interface configuration 1063 * of system. List may be used 1064 * in later ioctl's (above) to get 1065 * other information. 1066 */ 1067/*ARGSUSED*/ 1068static int 1069ifconf(cmd, data) 1070 u_long cmd; 1071 caddr_t data; 1072{ 1073 register struct ifconf *ifc = (struct ifconf *)data; 1074 register struct ifnet *ifp = TAILQ_FIRST(&ifnet); 1075 register struct ifaddr *ifa; 1076 struct ifreq ifr, *ifrp; 1077 int space = ifc->ifc_len, error = 0; 1078 1079 ifrp = ifc->ifc_req; 1080 for (; space > sizeof (ifr) && ifp; ifp = TAILQ_NEXT(ifp, if_link)) { 1081 char workbuf[64]; 1082 int ifnlen, addrs; 1083 1084 ifnlen = snprintf(workbuf, sizeof(workbuf), 1085 "%s%d", ifp->if_name, ifp->if_unit); 1086 if(ifnlen + 1 > sizeof ifr.ifr_name) { 1087 error = ENAMETOOLONG; 1088 break; 1089 } else { 1090 strcpy(ifr.ifr_name, workbuf); 1091 } 1092 1093 addrs = 0; 1094 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1095 for ( ; space > sizeof (ifr) && ifa; 1096 ifa = TAILQ_NEXT(ifa, ifa_link)) { 1097 register struct sockaddr *sa = ifa->ifa_addr; 1098 if (jailed(curproc->p_ucred) && 1099 prison_if(curproc->p_ucred, sa)) 1100 continue; 1101 addrs++; 1102#ifdef COMPAT_43 1103 if (cmd == OSIOCGIFCONF) { 1104 struct osockaddr *osa = 1105 (struct osockaddr *)&ifr.ifr_addr; 1106 ifr.ifr_addr = *sa; 1107 osa->sa_family = sa->sa_family; 1108 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1109 sizeof (ifr)); 1110 ifrp++; 1111 } else 1112#endif 1113 if (sa->sa_len <= sizeof(*sa)) { 1114 ifr.ifr_addr = *sa; 1115 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1116 sizeof (ifr)); 1117 ifrp++; 1118 } else { 1119 if (space < sizeof (ifr) + sa->sa_len - 1120 sizeof(*sa)) 1121 break; 1122 space -= sa->sa_len - sizeof(*sa); 1123 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1124 sizeof (ifr.ifr_name)); 1125 if (error == 0) 1126 error = copyout((caddr_t)sa, 1127 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 1128 ifrp = (struct ifreq *) 1129 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1130 } 1131 if (error) 1132 break; 1133 space -= sizeof (ifr); 1134 } 1135 if (error) 1136 break; 1137 if (!addrs) { 1138 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1139 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1140 sizeof (ifr)); 1141 if (error) 1142 break; 1143 space -= sizeof (ifr); 1144 ifrp++; 1145 } 1146 } 1147 ifc->ifc_len -= space; 1148 return (error); 1149} 1150 1151/* 1152 * Just like if_promisc(), but for all-multicast-reception mode. 1153 */ 1154int 1155if_allmulti(ifp, onswitch) 1156 struct ifnet *ifp; 1157 int onswitch; 1158{ 1159 int error = 0; 1160 int s = splimp(); 1161 1162 if (onswitch) { 1163 if (ifp->if_amcount++ == 0) { 1164 ifp->if_flags |= IFF_ALLMULTI; 1165 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0); 1166 } 1167 } else { 1168 if (ifp->if_amcount > 1) { 1169 ifp->if_amcount--; 1170 } else { 1171 ifp->if_amcount = 0; 1172 ifp->if_flags &= ~IFF_ALLMULTI; 1173 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0); 1174 } 1175 } 1176 splx(s); 1177 1178 if (error == 0) 1179 rt_ifmsg(ifp); 1180 return error; 1181} 1182 1183/* 1184 * Add a multicast listenership to the interface in question. 1185 * The link layer provides a routine which converts 1186 */ 1187int 1188if_addmulti(ifp, sa, retifma) 1189 struct ifnet *ifp; /* interface to manipulate */ 1190 struct sockaddr *sa; /* address to add */ 1191 struct ifmultiaddr **retifma; 1192{ 1193 struct sockaddr *llsa, *dupsa; 1194 int error, s; 1195 struct ifmultiaddr *ifma; 1196 1197 /* 1198 * If the matching multicast address already exists 1199 * then don't add a new one, just add a reference 1200 */ 1201 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1202 if (equal(sa, ifma->ifma_addr)) { 1203 ifma->ifma_refcount++; 1204 if (retifma) 1205 *retifma = ifma; 1206 return 0; 1207 } 1208 } 1209 1210 /* 1211 * Give the link layer a chance to accept/reject it, and also 1212 * find out which AF_LINK address this maps to, if it isn't one 1213 * already. 1214 */ 1215 if (ifp->if_resolvemulti) { 1216 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1217 if (error) return error; 1218 } else { 1219 llsa = 0; 1220 } 1221 1222 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1223 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1224 bcopy(sa, dupsa, sa->sa_len); 1225 1226 ifma->ifma_addr = dupsa; 1227 ifma->ifma_lladdr = llsa; 1228 ifma->ifma_ifp = ifp; 1229 ifma->ifma_refcount = 1; 1230 ifma->ifma_protospec = 0; 1231 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1232 1233 /* 1234 * Some network interfaces can scan the address list at 1235 * interrupt time; lock them out. 1236 */ 1237 s = splimp(); 1238 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1239 splx(s); 1240 *retifma = ifma; 1241 1242 if (llsa != 0) { 1243 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1244 if (equal(ifma->ifma_addr, llsa)) 1245 break; 1246 } 1247 if (ifma) { 1248 ifma->ifma_refcount++; 1249 } else { 1250 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1251 M_IFMADDR, M_WAITOK); 1252 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1253 M_IFMADDR, M_WAITOK); 1254 bcopy(llsa, dupsa, llsa->sa_len); 1255 ifma->ifma_addr = dupsa; 1256 ifma->ifma_ifp = ifp; 1257 ifma->ifma_refcount = 1; 1258 s = splimp(); 1259 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1260 splx(s); 1261 } 1262 } 1263 /* 1264 * We are certain we have added something, so call down to the 1265 * interface to let them know about it. 1266 */ 1267 s = splimp(); 1268 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1269 splx(s); 1270 1271 return 0; 1272} 1273 1274/* 1275 * Remove a reference to a multicast address on this interface. Yell 1276 * if the request does not match an existing membership. 1277 */ 1278int 1279if_delmulti(ifp, sa) 1280 struct ifnet *ifp; 1281 struct sockaddr *sa; 1282{ 1283 struct ifmultiaddr *ifma; 1284 int s; 1285 1286 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1287 if (equal(sa, ifma->ifma_addr)) 1288 break; 1289 if (ifma == 0) 1290 return ENOENT; 1291 1292 if (ifma->ifma_refcount > 1) { 1293 ifma->ifma_refcount--; 1294 return 0; 1295 } 1296 1297 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1298 sa = ifma->ifma_lladdr; 1299 s = splimp(); 1300 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1301 /* 1302 * Make sure the interface driver is notified 1303 * in the case of a link layer mcast group being left. 1304 */ 1305 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1306 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1307 splx(s); 1308 free(ifma->ifma_addr, M_IFMADDR); 1309 free(ifma, M_IFMADDR); 1310 if (sa == 0) 1311 return 0; 1312 1313 /* 1314 * Now look for the link-layer address which corresponds to 1315 * this network address. It had been squirreled away in 1316 * ifma->ifma_lladdr for this purpose (so we don't have 1317 * to call ifp->if_resolvemulti() again), and we saved that 1318 * value in sa above. If some nasty deleted the 1319 * link-layer address out from underneath us, we can deal because 1320 * the address we stored was is not the same as the one which was 1321 * in the record for the link-layer address. (So we don't complain 1322 * in that case.) 1323 */ 1324 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1325 if (equal(sa, ifma->ifma_addr)) 1326 break; 1327 if (ifma == 0) 1328 return 0; 1329 1330 if (ifma->ifma_refcount > 1) { 1331 ifma->ifma_refcount--; 1332 return 0; 1333 } 1334 1335 s = splimp(); 1336 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1337 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1338 splx(s); 1339 free(ifma->ifma_addr, M_IFMADDR); 1340 free(sa, M_IFMADDR); 1341 free(ifma, M_IFMADDR); 1342 1343 return 0; 1344} 1345 1346/* 1347 * Set the link layer address on an interface. 1348 * 1349 * At this time we only support certain types of interfaces, 1350 * and we don't allow the length of the address to change. 1351 */ 1352int 1353if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1354{ 1355 struct sockaddr_dl *sdl; 1356 struct ifaddr *ifa; 1357 1358 ifa = ifnet_addrs[ifp->if_index - 1]; 1359 if (ifa == NULL) 1360 return (EINVAL); 1361 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1362 if (sdl == NULL) 1363 return (EINVAL); 1364 if (len != sdl->sdl_alen) /* don't allow length to change */ 1365 return (EINVAL); 1366 switch (ifp->if_type) { 1367 case IFT_ETHER: /* these types use struct arpcom */ 1368 case IFT_FDDI: 1369 case IFT_XETHER: 1370 case IFT_ISO88025: 1371 case IFT_L2VLAN: 1372 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1373 bcopy(lladdr, LLADDR(sdl), len); 1374 break; 1375 default: 1376 return (ENODEV); 1377 } 1378 /* 1379 * If the interface is already up, we need 1380 * to re-init it in order to reprogram its 1381 * address filter. 1382 */ 1383 if ((ifp->if_flags & IFF_UP) != 0) { 1384 ifp->if_flags &= ~IFF_UP; 1385 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL); 1386 ifp->if_flags |= IFF_UP; 1387 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL); 1388 } 1389 return (0); 1390} 1391 1392struct ifmultiaddr * 1393ifmaof_ifpforaddr(sa, ifp) 1394 struct sockaddr *sa; 1395 struct ifnet *ifp; 1396{ 1397 struct ifmultiaddr *ifma; 1398 1399 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1400 if (equal(ifma->ifma_addr, sa)) 1401 break; 1402 1403 return ifma; 1404} 1405 1406SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1407SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 1408