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 * $FreeBSD$ 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 76 static int ifconf __P((u_long, caddr_t)); 77 static void ifinit __P((void *)); 78 static void if_qflush __P((struct ifqueue *)); 79 static void if_slowtimo __P((void *)); 80 static void link_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 81 static int if_rtdel __P((struct radix_node *, void *)); 82 83 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL) 84 85 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 86 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 87 88 int ifqmaxlen = IFQ_MAXLEN; 89 struct 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 */ 96 extern 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*/ 106 void 107 ifinit(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 } 129 130 int if_index = 0; 131 struct ifaddr **ifnet_addrs; 132 struct ifnet **ifindex2ifnet = NULL; 133 134 135 /* 136 * Attach an interface to the 137 * list of "active" interfaces. 138 */ 139 void 140 if_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 */ 231 void 232 if_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 */ 318 static int 319 if_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*/ 351 struct ifaddr * 352 ifa_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 TAILQ_FOREACH(ifp, &ifnet, if_link) 361 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 362 if (ifa->ifa_addr->sa_family != addr->sa_family) 363 continue; 364 if (equal(addr, ifa->ifa_addr)) 365 return (ifa); 366 if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && 367 /* IP6 doesn't have broadcast */ 368 ifa->ifa_broadaddr->sa_len != 0 && 369 equal(ifa->ifa_broadaddr, addr)) 370 return (ifa); 371 } 372 return ((struct ifaddr *)0); 373 } 374 /* 375 * Locate the point to point interface with a given destination address. 376 */ 377 /*ARGSUSED*/ 378 struct ifaddr * 379 ifa_ifwithdstaddr(addr) 380 register struct sockaddr *addr; 381 { 382 register struct ifnet *ifp; 383 register struct ifaddr *ifa; 384 385 TAILQ_FOREACH(ifp, &ifnet, if_link) 386 if (ifp->if_flags & IFF_POINTOPOINT) 387 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 388 if (ifa->ifa_addr->sa_family != addr->sa_family) 389 continue; 390 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 391 return (ifa); 392 } 393 return ((struct ifaddr *)0); 394 } 395 396 /* 397 * Find an interface on a specific network. If many, choice 398 * is most specific found. 399 */ 400 struct ifaddr * 401 ifa_ifwithnet(addr) 402 struct sockaddr *addr; 403 { 404 register struct ifnet *ifp; 405 register struct ifaddr *ifa; 406 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 407 u_int af = addr->sa_family; 408 char *addr_data = addr->sa_data, *cplim; 409 410 /* 411 * AF_LINK addresses can be looked up directly by their index number, 412 * so do that if we can. 413 */ 414 if (af == AF_LINK) { 415 register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 416 if (sdl->sdl_index && sdl->sdl_index <= if_index) 417 return (ifnet_addrs[sdl->sdl_index - 1]); 418 } 419 420 /* 421 * Scan though each interface, looking for ones that have 422 * addresses in this address family. 423 */ 424 TAILQ_FOREACH(ifp, &ifnet, if_link) { 425 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 426 register char *cp, *cp2, *cp3; 427 428 if (ifa->ifa_addr->sa_family != af) 429 next: continue; 430 if ( 431 #ifdef INET6 /* XXX: for maching gif tunnel dst as routing entry gateway */ 432 addr->sa_family != AF_INET6 && 433 #endif 434 ifp->if_flags & IFF_POINTOPOINT) { 435 /* 436 * This is a bit broken as it doesn't 437 * take into account that the remote end may 438 * be a single node in the network we are 439 * looking for. 440 * The trouble is that we don't know the 441 * netmask for the remote end. 442 */ 443 if (ifa->ifa_dstaddr != 0 444 && equal(addr, ifa->ifa_dstaddr)) 445 return (ifa); 446 } else { 447 /* 448 * if we have a special address handler, 449 * then use it instead of the generic one. 450 */ 451 if (ifa->ifa_claim_addr) { 452 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 453 return (ifa); 454 } else { 455 continue; 456 } 457 } 458 459 /* 460 * Scan all the bits in the ifa's address. 461 * If a bit dissagrees with what we are 462 * looking for, mask it with the netmask 463 * to see if it really matters. 464 * (A byte at a time) 465 */ 466 if (ifa->ifa_netmask == 0) 467 continue; 468 cp = addr_data; 469 cp2 = ifa->ifa_addr->sa_data; 470 cp3 = ifa->ifa_netmask->sa_data; 471 cplim = ifa->ifa_netmask->sa_len 472 + (char *)ifa->ifa_netmask; 473 while (cp3 < cplim) 474 if ((*cp++ ^ *cp2++) & *cp3++) 475 goto next; /* next address! */ 476 /* 477 * If the netmask of what we just found 478 * is more specific than what we had before 479 * (if we had one) then remember the new one 480 * before continuing to search 481 * for an even better one. 482 */ 483 if (ifa_maybe == 0 || 484 rn_refines((caddr_t)ifa->ifa_netmask, 485 (caddr_t)ifa_maybe->ifa_netmask)) 486 ifa_maybe = ifa; 487 } 488 } 489 } 490 return (ifa_maybe); 491 } 492 493 /* 494 * Find an interface address specific to an interface best matching 495 * a given address. 496 */ 497 struct ifaddr * 498 ifaof_ifpforaddr(addr, ifp) 499 struct sockaddr *addr; 500 register struct ifnet *ifp; 501 { 502 register struct ifaddr *ifa; 503 register char *cp, *cp2, *cp3; 504 register char *cplim; 505 struct ifaddr *ifa_maybe = 0; 506 u_int af = addr->sa_family; 507 508 if (af >= AF_MAX) 509 return (0); 510 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 511 if (ifa->ifa_addr->sa_family != af) 512 continue; 513 if (ifa_maybe == 0) 514 ifa_maybe = ifa; 515 if (ifa->ifa_netmask == 0) { 516 if (equal(addr, ifa->ifa_addr) || 517 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 518 return (ifa); 519 continue; 520 } 521 if (ifp->if_flags & IFF_POINTOPOINT) { 522 if (equal(addr, ifa->ifa_dstaddr)) 523 return (ifa); 524 } else { 525 cp = addr->sa_data; 526 cp2 = ifa->ifa_addr->sa_data; 527 cp3 = ifa->ifa_netmask->sa_data; 528 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 529 for (; cp3 < cplim; cp3++) 530 if ((*cp++ ^ *cp2++) & *cp3) 531 break; 532 if (cp3 == cplim) 533 return (ifa); 534 } 535 } 536 return (ifa_maybe); 537 } 538 539 #include <net/route.h> 540 541 /* 542 * Default action when installing a route with a Link Level gateway. 543 * Lookup an appropriate real ifa to point to. 544 * This should be moved to /sys/net/link.c eventually. 545 */ 546 static void 547 link_rtrequest(cmd, rt, sa) 548 int cmd; 549 register struct rtentry *rt; 550 struct sockaddr *sa; 551 { 552 register struct ifaddr *ifa; 553 struct sockaddr *dst; 554 struct ifnet *ifp; 555 556 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 557 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 558 return; 559 ifa = ifaof_ifpforaddr(dst, ifp); 560 if (ifa) { 561 IFAFREE(rt->rt_ifa); 562 rt->rt_ifa = ifa; 563 ifa->ifa_refcnt++; 564 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 565 ifa->ifa_rtrequest(cmd, rt, sa); 566 } 567 } 568 569 /* 570 * Mark an interface down and notify protocols of 571 * the transition. 572 * NOTE: must be called at splnet or eqivalent. 573 */ 574 void 575 if_unroute(ifp, flag, fam) 576 register struct ifnet *ifp; 577 int flag, fam; 578 { 579 register struct ifaddr *ifa; 580 581 ifp->if_flags &= ~flag; 582 getmicrotime(&ifp->if_lastchange); 583 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 584 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 585 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 586 if_qflush(&ifp->if_snd); 587 rt_ifmsg(ifp); 588 } 589 590 /* 591 * Mark an interface up and notify protocols of 592 * the transition. 593 * NOTE: must be called at splnet or eqivalent. 594 */ 595 void 596 if_route(ifp, flag, fam) 597 register struct ifnet *ifp; 598 int flag, fam; 599 { 600 register struct ifaddr *ifa; 601 602 ifp->if_flags |= flag; 603 getmicrotime(&ifp->if_lastchange); 604 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 605 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 606 pfctlinput(PRC_IFUP, ifa->ifa_addr); 607 rt_ifmsg(ifp); 608 #ifdef INET6 609 in6_if_up(ifp); 610 #endif 611 } 612 613 /* 614 * Mark an interface down and notify protocols of 615 * the transition. 616 * NOTE: must be called at splnet or eqivalent. 617 */ 618 void 619 if_down(ifp) 620 register struct ifnet *ifp; 621 { 622 623 if_unroute(ifp, IFF_UP, AF_UNSPEC); 624 } 625 626 /* 627 * Mark an interface up and notify protocols of 628 * the transition. 629 * NOTE: must be called at splnet or eqivalent. 630 */ 631 void 632 if_up(ifp) 633 register struct ifnet *ifp; 634 { 635 636 if_route(ifp, IFF_UP, AF_UNSPEC); 637 } 638 639 /* 640 * Flush an interface queue. 641 */ 642 static void 643 if_qflush(ifq) 644 register struct ifqueue *ifq; 645 { 646 register struct mbuf *m, *n; 647 648 n = ifq->ifq_head; 649 while ((m = n) != 0) { 650 n = m->m_act; 651 m_freem(m); 652 } 653 ifq->ifq_head = 0; 654 ifq->ifq_tail = 0; 655 ifq->ifq_len = 0; 656 } 657 658 /* 659 * Handle interface watchdog timer routines. Called 660 * from softclock, we decrement timers (if set) and 661 * call the appropriate interface routine on expiration. 662 */ 663 static void 664 if_slowtimo(arg) 665 void *arg; 666 { 667 register struct ifnet *ifp; 668 int s = splimp(); 669 670 TAILQ_FOREACH(ifp, &ifnet, if_link) { 671 if (ifp->if_timer == 0 || --ifp->if_timer) 672 continue; 673 if (ifp->if_watchdog) 674 (*ifp->if_watchdog)(ifp); 675 } 676 splx(s); 677 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 678 } 679 680 /* 681 * Map interface name to 682 * interface structure pointer. 683 */ 684 struct ifnet * 685 ifunit(char *name) 686 { 687 char namebuf[IFNAMSIZ + 1]; 688 char *cp; 689 struct ifnet *ifp; 690 int unit; 691 unsigned len, m; 692 char c; 693 694 len = strlen(name); 695 if (len < 2 || len > IFNAMSIZ) 696 return NULL; 697 cp = name + len - 1; 698 c = *cp; 699 if (c < '0' || c > '9') 700 return NULL; /* trailing garbage */ 701 unit = 0; 702 m = 1; 703 do { 704 if (cp == name) 705 return NULL; /* no interface name */ 706 unit += (c - '0') * m; 707 if (unit > 1000000) 708 return NULL; /* number is unreasonable */ 709 m *= 10; 710 c = *--cp; 711 } while (c >= '0' && c <= '9'); 712 len = cp - name + 1; 713 bcopy(name, namebuf, len); 714 namebuf[len] = '\0'; 715 /* 716 * Now search all the interfaces for this name/number 717 */ 718 TAILQ_FOREACH(ifp, &ifnet, if_link) { 719 if (strcmp(ifp->if_name, namebuf)) 720 continue; 721 if (unit == ifp->if_unit) 722 break; 723 } 724 return (ifp); 725 } 726 727 728 /* 729 * Map interface name in a sockaddr_dl to 730 * interface structure pointer. 731 */ 732 struct ifnet * 733 if_withname(sa) 734 struct sockaddr *sa; 735 { 736 char ifname[IFNAMSIZ+1]; 737 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 738 739 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 740 (sdl->sdl_nlen > IFNAMSIZ) ) 741 return NULL; 742 743 /* 744 * ifunit wants a null-terminated name. It may not be null-terminated 745 * in the sockaddr. We don't want to change the caller's sockaddr, 746 * and there might not be room to put the trailing null anyway, so we 747 * make a local copy that we know we can null terminate safely. 748 */ 749 750 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 751 ifname[sdl->sdl_nlen] = '\0'; 752 return ifunit(ifname); 753 } 754 755 756 /* 757 * Interface ioctls. 758 */ 759 int 760 ifioctl(so, cmd, data, p) 761 struct socket *so; 762 u_long cmd; 763 caddr_t data; 764 struct proc *p; 765 { 766 register struct ifnet *ifp; 767 register struct ifreq *ifr; 768 struct ifstat *ifs; 769 int error; 770 short oif_flags; 771 772 switch (cmd) { 773 774 case SIOCGIFCONF: 775 case OSIOCGIFCONF: 776 return (ifconf(cmd, data)); 777 } 778 ifr = (struct ifreq *)data; 779 ifp = ifunit(ifr->ifr_name); 780 if (ifp == 0) 781 return (ENXIO); 782 switch (cmd) { 783 784 case SIOCGIFFLAGS: 785 ifr->ifr_flags = ifp->if_flags; 786 break; 787 788 case SIOCGIFMETRIC: 789 ifr->ifr_metric = ifp->if_metric; 790 break; 791 792 case SIOCGIFMTU: 793 ifr->ifr_mtu = ifp->if_mtu; 794 break; 795 796 case SIOCGIFPHYS: 797 ifr->ifr_phys = ifp->if_physical; 798 break; 799 800 case SIOCSIFFLAGS: 801 error = suser(p); 802 if (error) 803 return (error); 804 ifr->ifr_prevflags = ifp->if_flags; 805 if (ifp->if_flags & IFF_SMART) { 806 /* Smart drivers twiddle their own routes */ 807 } else if (ifp->if_flags & IFF_UP && 808 (ifr->ifr_flags & IFF_UP) == 0) { 809 int s = splimp(); 810 if_down(ifp); 811 splx(s); 812 } else if (ifr->ifr_flags & IFF_UP && 813 (ifp->if_flags & IFF_UP) == 0) { 814 int s = splimp(); 815 if_up(ifp); 816 splx(s); 817 } 818 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 819 (ifr->ifr_flags &~ IFF_CANTCHANGE); 820 if (ifp->if_ioctl) 821 (void) (*ifp->if_ioctl)(ifp, cmd, data); 822 getmicrotime(&ifp->if_lastchange); 823 break; 824 825 case SIOCSIFMETRIC: 826 error = suser(p); 827 if (error) 828 return (error); 829 ifp->if_metric = ifr->ifr_metric; 830 getmicrotime(&ifp->if_lastchange); 831 break; 832 833 case SIOCSIFPHYS: 834 error = suser(p); 835 if (error) 836 return error; 837 if (!ifp->if_ioctl) 838 return EOPNOTSUPP; 839 error = (*ifp->if_ioctl)(ifp, cmd, data); 840 if (error == 0) 841 getmicrotime(&ifp->if_lastchange); 842 return(error); 843 844 case SIOCSIFMTU: 845 { 846 u_long oldmtu = ifp->if_mtu; 847 848 error = suser(p); 849 if (error) 850 return (error); 851 if (ifp->if_ioctl == NULL) 852 return (EOPNOTSUPP); 853 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 854 return (EINVAL); 855 error = (*ifp->if_ioctl)(ifp, cmd, data); 856 if (error == 0) { 857 getmicrotime(&ifp->if_lastchange); 858 rt_ifmsg(ifp); 859 } 860 /* 861 * If the link MTU changed, do network layer specific procedure. 862 */ 863 if (ifp->if_mtu != oldmtu) { 864 #ifdef INET6 865 nd6_setmtu(ifp); 866 #endif 867 } 868 return (error); 869 } 870 871 case SIOCADDMULTI: 872 case SIOCDELMULTI: 873 error = suser(p); 874 if (error) 875 return (error); 876 877 /* Don't allow group membership on non-multicast interfaces. */ 878 if ((ifp->if_flags & IFF_MULTICAST) == 0) 879 return EOPNOTSUPP; 880 881 /* Don't let users screw up protocols' entries. */ 882 if (ifr->ifr_addr.sa_family != AF_LINK) 883 return EINVAL; 884 885 if (cmd == SIOCADDMULTI) { 886 struct ifmultiaddr *ifma; 887 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 888 } else { 889 error = if_delmulti(ifp, &ifr->ifr_addr); 890 } 891 if (error == 0) 892 getmicrotime(&ifp->if_lastchange); 893 return error; 894 895 case SIOCSIFPHYADDR: 896 case SIOCDIFPHYADDR: 897 #ifdef INET6 898 case SIOCSIFPHYADDR_IN6: 899 #endif 900 case SIOCSIFMEDIA: 901 case SIOCSIFGENERIC: 902 error = suser(p); 903 if (error) 904 return (error); 905 if (ifp->if_ioctl == 0) 906 return (EOPNOTSUPP); 907 error = (*ifp->if_ioctl)(ifp, cmd, data); 908 if (error == 0) 909 getmicrotime(&ifp->if_lastchange); 910 return error; 911 912 case SIOCGIFSTATUS: 913 ifs = (struct ifstat *)data; 914 ifs->ascii[0] = '\0'; 915 916 case SIOCGIFMEDIA: 917 case SIOCGIFGENERIC: 918 if (ifp->if_ioctl == 0) 919 return (EOPNOTSUPP); 920 return ((*ifp->if_ioctl)(ifp, cmd, data)); 921 922 case SIOCSIFLLADDR: 923 error = suser(p); 924 if (error) 925 return (error); 926 return if_setlladdr(ifp, 927 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 928 929 default: 930 oif_flags = ifp->if_flags; 931 if (so->so_proto == 0) 932 return (EOPNOTSUPP); 933 #ifndef COMPAT_43 934 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 935 data, 936 ifp, p)); 937 #else 938 { 939 int ocmd = cmd; 940 941 switch (cmd) { 942 943 case SIOCSIFDSTADDR: 944 case SIOCSIFADDR: 945 case SIOCSIFBRDADDR: 946 case SIOCSIFNETMASK: 947 #if BYTE_ORDER != BIG_ENDIAN 948 if (ifr->ifr_addr.sa_family == 0 && 949 ifr->ifr_addr.sa_len < 16) { 950 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 951 ifr->ifr_addr.sa_len = 16; 952 } 953 #else 954 if (ifr->ifr_addr.sa_len == 0) 955 ifr->ifr_addr.sa_len = 16; 956 #endif 957 break; 958 959 case OSIOCGIFADDR: 960 cmd = SIOCGIFADDR; 961 break; 962 963 case OSIOCGIFDSTADDR: 964 cmd = SIOCGIFDSTADDR; 965 break; 966 967 case OSIOCGIFBRDADDR: 968 cmd = SIOCGIFBRDADDR; 969 break; 970 971 case OSIOCGIFNETMASK: 972 cmd = SIOCGIFNETMASK; 973 } 974 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 975 cmd, 976 data, 977 ifp, p)); 978 switch (ocmd) { 979 980 case OSIOCGIFADDR: 981 case OSIOCGIFDSTADDR: 982 case OSIOCGIFBRDADDR: 983 case OSIOCGIFNETMASK: 984 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 985 986 } 987 } 988 #endif /* COMPAT_43 */ 989 990 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 991 #ifdef INET6 992 DELAY(100);/* XXX: temporal workaround for fxp issue*/ 993 if (ifp->if_flags & IFF_UP) { 994 int s = splimp(); 995 in6_if_up(ifp); 996 splx(s); 997 } 998 #endif 999 } 1000 return (error); 1001 1002 } 1003 return (0); 1004 } 1005 1006 /* 1007 * Set/clear promiscuous mode on interface ifp based on the truth value 1008 * of pswitch. The calls are reference counted so that only the first 1009 * "on" request actually has an effect, as does the final "off" request. 1010 * Results are undefined if the "off" and "on" requests are not matched. 1011 */ 1012 int 1013 ifpromisc(ifp, pswitch) 1014 struct ifnet *ifp; 1015 int pswitch; 1016 { 1017 struct ifreq ifr; 1018 int error; 1019 int oldflags, oldpcount; 1020 1021 oldpcount = ifp->if_pcount; 1022 oldflags = ifp->if_flags; 1023 if (pswitch) { 1024 /* 1025 * If the device is not configured up, we cannot put it in 1026 * promiscuous mode. 1027 */ 1028 if ((ifp->if_flags & IFF_UP) == 0) 1029 return (ENETDOWN); 1030 if (ifp->if_pcount++ != 0) 1031 return (0); 1032 ifp->if_flags |= IFF_PROMISC; 1033 } else { 1034 if (--ifp->if_pcount > 0) 1035 return (0); 1036 ifp->if_flags &= ~IFF_PROMISC; 1037 } 1038 ifr.ifr_flags = ifp->if_flags; 1039 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1040 if (error == 0) { 1041 log(LOG_INFO, "%s%d: promiscuous mode %s\n", 1042 ifp->if_name, ifp->if_unit, 1043 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1044 rt_ifmsg(ifp); 1045 } else { 1046 ifp->if_pcount = oldpcount; 1047 ifp->if_flags = oldflags; 1048 } 1049 return error; 1050 } 1051 1052 /* 1053 * Return interface configuration 1054 * of system. List may be used 1055 * in later ioctl's (above) to get 1056 * other information. 1057 */ 1058 /*ARGSUSED*/ 1059 static int 1060 ifconf(cmd, data) 1061 u_long cmd; 1062 caddr_t data; 1063 { 1064 register struct ifconf *ifc = (struct ifconf *)data; 1065 register struct ifnet *ifp = TAILQ_FIRST(&ifnet); 1066 register struct ifaddr *ifa; 1067 struct ifreq ifr, *ifrp; 1068 int space = ifc->ifc_len, error = 0; 1069 1070 ifrp = ifc->ifc_req; 1071 for (; space > sizeof (ifr) && ifp; ifp = TAILQ_NEXT(ifp, if_link)) { 1072 char workbuf[64]; 1073 int ifnlen, addrs; 1074 1075 ifnlen = snprintf(workbuf, sizeof(workbuf), 1076 "%s%d", ifp->if_name, ifp->if_unit); 1077 if(ifnlen + 1 > sizeof ifr.ifr_name) { 1078 error = ENAMETOOLONG; 1079 break; 1080 } else { 1081 strcpy(ifr.ifr_name, workbuf); 1082 } 1083 1084 addrs = 0; 1085 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1086 for ( ; space > sizeof (ifr) && ifa; 1087 ifa = TAILQ_NEXT(ifa, ifa_link)) { 1088 register struct sockaddr *sa = ifa->ifa_addr; 1089 if (jailed(curproc->p_ucred) && 1090 prison_if(curproc->p_ucred, sa)) 1091 continue; 1092 addrs++; 1093 #ifdef COMPAT_43 1094 if (cmd == OSIOCGIFCONF) { 1095 struct osockaddr *osa = 1096 (struct osockaddr *)&ifr.ifr_addr; 1097 ifr.ifr_addr = *sa; 1098 osa->sa_family = sa->sa_family; 1099 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1100 sizeof (ifr)); 1101 ifrp++; 1102 } else 1103 #endif 1104 if (sa->sa_len <= sizeof(*sa)) { 1105 ifr.ifr_addr = *sa; 1106 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1107 sizeof (ifr)); 1108 ifrp++; 1109 } else { 1110 if (space < sizeof (ifr) + sa->sa_len - 1111 sizeof(*sa)) 1112 break; 1113 space -= sa->sa_len - sizeof(*sa); 1114 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1115 sizeof (ifr.ifr_name)); 1116 if (error == 0) 1117 error = copyout((caddr_t)sa, 1118 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 1119 ifrp = (struct ifreq *) 1120 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1121 } 1122 if (error) 1123 break; 1124 space -= sizeof (ifr); 1125 } 1126 if (error) 1127 break; 1128 if (!addrs) { 1129 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1130 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1131 sizeof (ifr)); 1132 if (error) 1133 break; 1134 space -= sizeof (ifr); 1135 ifrp++; 1136 } 1137 } 1138 ifc->ifc_len -= space; 1139 return (error); 1140 } 1141 1142 /* 1143 * Just like if_promisc(), but for all-multicast-reception mode. 1144 */ 1145 int 1146 if_allmulti(ifp, onswitch) 1147 struct ifnet *ifp; 1148 int onswitch; 1149 { 1150 int error = 0; 1151 int s = splimp(); 1152 1153 if (onswitch) { 1154 if (ifp->if_amcount++ == 0) { 1155 ifp->if_flags |= IFF_ALLMULTI; 1156 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0); 1157 } 1158 } else { 1159 if (ifp->if_amcount > 1) { 1160 ifp->if_amcount--; 1161 } else { 1162 ifp->if_amcount = 0; 1163 ifp->if_flags &= ~IFF_ALLMULTI; 1164 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0); 1165 } 1166 } 1167 splx(s); 1168 1169 if (error == 0) 1170 rt_ifmsg(ifp); 1171 return error; 1172 } 1173 1174 /* 1175 * Add a multicast listenership to the interface in question. 1176 * The link layer provides a routine which converts 1177 */ 1178 int 1179 if_addmulti(ifp, sa, retifma) 1180 struct ifnet *ifp; /* interface to manipulate */ 1181 struct sockaddr *sa; /* address to add */ 1182 struct ifmultiaddr **retifma; 1183 { 1184 struct sockaddr *llsa, *dupsa; 1185 int error, s; 1186 struct ifmultiaddr *ifma; 1187 1188 /* 1189 * If the matching multicast address already exists 1190 * then don't add a new one, just add a reference 1191 */ 1192 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1193 if (equal(sa, ifma->ifma_addr)) { 1194 ifma->ifma_refcount++; 1195 if (retifma) 1196 *retifma = ifma; 1197 return 0; 1198 } 1199 } 1200 1201 /* 1202 * Give the link layer a chance to accept/reject it, and also 1203 * find out which AF_LINK address this maps to, if it isn't one 1204 * already. 1205 */ 1206 if (ifp->if_resolvemulti) { 1207 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1208 if (error) return error; 1209 } else { 1210 llsa = 0; 1211 } 1212 1213 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1214 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1215 bcopy(sa, dupsa, sa->sa_len); 1216 1217 ifma->ifma_addr = dupsa; 1218 ifma->ifma_lladdr = llsa; 1219 ifma->ifma_ifp = ifp; 1220 ifma->ifma_refcount = 1; 1221 ifma->ifma_protospec = 0; 1222 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1223 1224 /* 1225 * Some network interfaces can scan the address list at 1226 * interrupt time; lock them out. 1227 */ 1228 s = splimp(); 1229 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1230 splx(s); 1231 *retifma = ifma; 1232 1233 if (llsa != 0) { 1234 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1235 if (equal(ifma->ifma_addr, llsa)) 1236 break; 1237 } 1238 if (ifma) { 1239 ifma->ifma_refcount++; 1240 } else { 1241 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1242 M_IFMADDR, M_WAITOK); 1243 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1244 M_IFMADDR, M_WAITOK); 1245 bcopy(llsa, dupsa, llsa->sa_len); 1246 ifma->ifma_addr = dupsa; 1247 ifma->ifma_ifp = ifp; 1248 ifma->ifma_refcount = 1; 1249 s = splimp(); 1250 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1251 splx(s); 1252 } 1253 } 1254 /* 1255 * We are certain we have added something, so call down to the 1256 * interface to let them know about it. 1257 */ 1258 s = splimp(); 1259 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1260 splx(s); 1261 1262 return 0; 1263 } 1264 1265 /* 1266 * Remove a reference to a multicast address on this interface. Yell 1267 * if the request does not match an existing membership. 1268 */ 1269 int 1270 if_delmulti(ifp, sa) 1271 struct ifnet *ifp; 1272 struct sockaddr *sa; 1273 { 1274 struct ifmultiaddr *ifma; 1275 int s; 1276 1277 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, 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 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1292 /* 1293 * Make sure the interface driver is notified 1294 * in the case of a link layer mcast group being left. 1295 */ 1296 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1297 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1298 splx(s); 1299 free(ifma->ifma_addr, M_IFMADDR); 1300 free(ifma, M_IFMADDR); 1301 if (sa == 0) 1302 return 0; 1303 1304 /* 1305 * Now look for the link-layer address which corresponds to 1306 * this network address. It had been squirreled away in 1307 * ifma->ifma_lladdr for this purpose (so we don't have 1308 * to call ifp->if_resolvemulti() again), and we saved that 1309 * value in sa above. If some nasty deleted the 1310 * link-layer address out from underneath us, we can deal because 1311 * the address we stored was is not the same as the one which was 1312 * in the record for the link-layer address. (So we don't complain 1313 * in that case.) 1314 */ 1315 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1316 if (equal(sa, ifma->ifma_addr)) 1317 break; 1318 if (ifma == 0) 1319 return 0; 1320 1321 if (ifma->ifma_refcount > 1) { 1322 ifma->ifma_refcount--; 1323 return 0; 1324 } 1325 1326 s = splimp(); 1327 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1328 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1329 splx(s); 1330 free(ifma->ifma_addr, M_IFMADDR); 1331 free(sa, M_IFMADDR); 1332 free(ifma, M_IFMADDR); 1333 1334 return 0; 1335 } 1336 1337 /* 1338 * Set the link layer address on an interface. 1339 * 1340 * At this time we only support certain types of interfaces, 1341 * and we don't allow the length of the address to change. 1342 */ 1343 int 1344 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1345 { 1346 struct sockaddr_dl *sdl; 1347 struct ifaddr *ifa; 1348 1349 ifa = ifnet_addrs[ifp->if_index - 1]; 1350 if (ifa == NULL) 1351 return (EINVAL); 1352 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1353 if (sdl == NULL) 1354 return (EINVAL); 1355 if (len != sdl->sdl_alen) /* don't allow length to change */ 1356 return (EINVAL); 1357 switch (ifp->if_type) { 1358 case IFT_ETHER: /* these types use struct arpcom */ 1359 case IFT_FDDI: 1360 case IFT_XETHER: 1361 case IFT_ISO88025: 1362 case IFT_L2VLAN: 1363 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1364 bcopy(lladdr, LLADDR(sdl), len); 1365 break; 1366 default: 1367 return (ENODEV); 1368 } 1369 /* 1370 * If the interface is already up, we need 1371 * to re-init it in order to reprogram its 1372 * address filter. 1373 */ 1374 if ((ifp->if_flags & IFF_UP) != 0) { 1375 ifp->if_flags &= ~IFF_UP; 1376 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL); 1377 ifp->if_flags |= IFF_UP; 1378 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL); 1379 } 1380 return (0); 1381 } 1382 1383 struct ifmultiaddr * 1384 ifmaof_ifpforaddr(sa, ifp) 1385 struct sockaddr *sa; 1386 struct ifnet *ifp; 1387 { 1388 struct ifmultiaddr *ifma; 1389 1390 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1391 if (equal(ifma->ifma_addr, sa)) 1392 break; 1393 1394 return ifma; 1395 } 1396 1397 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1398 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 1399