1 /*- 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (C) 2001 WIDE Project. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)in.c 8.4 (Berkeley) 1/9/95 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "opt_carp.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/sockio.h> 41 #include <sys/malloc.h> 42 #include <sys/priv.h> 43 #include <sys/socket.h> 44 #include <sys/jail.h> 45 #include <sys/kernel.h> 46 #include <sys/proc.h> 47 #include <sys/sysctl.h> 48 #include <sys/vimage.h> 49 50 #include <net/if.h> 51 #include <net/if_llatbl.h> 52 #include <net/if_types.h> 53 #include <net/route.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_var.h> 57 #include <netinet/in_pcb.h> 58 #include <netinet/ip_var.h> 59 #include <netinet/vinet.h> 60 61 static int in_mask2len(struct in_addr *); 62 static void in_len2mask(struct in_addr *, int); 63 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 64 struct ifnet *, struct thread *); 65 66 static int in_addprefix(struct in_ifaddr *, int); 67 static int in_scrubprefix(struct in_ifaddr *); 68 static void in_socktrim(struct sockaddr_in *); 69 static int in_ifinit(struct ifnet *, 70 struct in_ifaddr *, struct sockaddr_in *, int); 71 static void in_purgemaddrs(struct ifnet *); 72 73 #ifdef VIMAGE_GLOBALS 74 static int subnetsarelocal; 75 static int sameprefixcarponly; 76 extern struct inpcbinfo ripcbinfo; 77 #endif 78 79 SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, subnets_are_local, 80 CTLFLAG_RW, subnetsarelocal, 0, 81 "Treat all subnets as directly connected"); 82 SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, same_prefix_carp_only, 83 CTLFLAG_RW, sameprefixcarponly, 0, 84 "Refuse to create same prefixes on different interfaces"); 85 86 /* 87 * Return 1 if an internet address is for a ``local'' host 88 * (one to which we have a connection). If subnetsarelocal 89 * is true, this includes other subnets of the local net. 90 * Otherwise, it includes only the directly-connected (sub)nets. 91 */ 92 int 93 in_localaddr(struct in_addr in) 94 { 95 INIT_VNET_INET(curvnet); 96 register u_long i = ntohl(in.s_addr); 97 register struct in_ifaddr *ia; 98 99 if (V_subnetsarelocal) { 100 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) 101 if ((i & ia->ia_netmask) == ia->ia_net) 102 return (1); 103 } else { 104 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) 105 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 106 return (1); 107 } 108 return (0); 109 } 110 111 /* 112 * Return 1 if an internet address is for the local host and configured 113 * on one of its interfaces. 114 */ 115 int 116 in_localip(struct in_addr in) 117 { 118 INIT_VNET_INET(curvnet); 119 struct in_ifaddr *ia; 120 121 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 122 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 123 return (1); 124 } 125 return (0); 126 } 127 128 /* 129 * Determine whether an IP address is in a reserved set of addresses 130 * that may not be forwarded, or whether datagrams to that destination 131 * may be forwarded. 132 */ 133 int 134 in_canforward(struct in_addr in) 135 { 136 register u_long i = ntohl(in.s_addr); 137 register u_long net; 138 139 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 140 return (0); 141 if (IN_CLASSA(i)) { 142 net = i & IN_CLASSA_NET; 143 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 144 return (0); 145 } 146 return (1); 147 } 148 149 /* 150 * Trim a mask in a sockaddr 151 */ 152 static void 153 in_socktrim(struct sockaddr_in *ap) 154 { 155 register char *cplim = (char *) &ap->sin_addr; 156 register char *cp = (char *) (&ap->sin_addr + 1); 157 158 ap->sin_len = 0; 159 while (--cp >= cplim) 160 if (*cp) { 161 (ap)->sin_len = cp - (char *) (ap) + 1; 162 break; 163 } 164 } 165 166 static int 167 in_mask2len(mask) 168 struct in_addr *mask; 169 { 170 int x, y; 171 u_char *p; 172 173 p = (u_char *)mask; 174 for (x = 0; x < sizeof(*mask); x++) { 175 if (p[x] != 0xff) 176 break; 177 } 178 y = 0; 179 if (x < sizeof(*mask)) { 180 for (y = 0; y < 8; y++) { 181 if ((p[x] & (0x80 >> y)) == 0) 182 break; 183 } 184 } 185 return (x * 8 + y); 186 } 187 188 static void 189 in_len2mask(struct in_addr *mask, int len) 190 { 191 int i; 192 u_char *p; 193 194 p = (u_char *)mask; 195 bzero(mask, sizeof(*mask)); 196 for (i = 0; i < len / 8; i++) 197 p[i] = 0xff; 198 if (len % 8) 199 p[i] = (0xff00 >> (len % 8)) & 0xff; 200 } 201 202 /* 203 * Generic internet control operations (ioctl's). 204 * Ifp is 0 if not an interface-specific ioctl. 205 */ 206 /* ARGSUSED */ 207 int 208 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 209 struct thread *td) 210 { 211 INIT_VNET_INET(curvnet); /* both so and ifp can be NULL here! */ 212 register struct ifreq *ifr = (struct ifreq *)data; 213 register struct in_ifaddr *ia, *iap; 214 register struct ifaddr *ifa; 215 struct in_addr allhosts_addr; 216 struct in_addr dst; 217 struct in_ifaddr *oia; 218 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 219 struct sockaddr_in oldaddr; 220 int error, hostIsNew, iaIsNew, maskIsNew, s; 221 int iaIsFirst; 222 223 ia = NULL; 224 iaIsFirst = 0; 225 iaIsNew = 0; 226 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 227 228 switch (cmd) { 229 case SIOCALIFADDR: 230 if (td != NULL) { 231 error = priv_check(td, PRIV_NET_ADDIFADDR); 232 if (error) 233 return (error); 234 } 235 if (ifp == NULL) 236 return (EINVAL); 237 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 238 239 case SIOCDLIFADDR: 240 if (td != NULL) { 241 error = priv_check(td, PRIV_NET_DELIFADDR); 242 if (error) 243 return (error); 244 } 245 if (ifp == NULL) 246 return (EINVAL); 247 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 248 249 case SIOCGLIFADDR: 250 if (ifp == NULL) 251 return (EINVAL); 252 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 253 } 254 255 /* 256 * Find address for this interface, if it exists. 257 * 258 * If an alias address was specified, find that one instead of 259 * the first one on the interface, if possible. 260 */ 261 if (ifp != NULL) { 262 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 263 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 264 if (iap->ia_ifp == ifp && 265 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 266 if (td == NULL || prison_check_ip4( 267 td->td_ucred, &dst) == 0) 268 ia = iap; 269 break; 270 } 271 if (ia == NULL) 272 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 273 iap = ifatoia(ifa); 274 if (iap->ia_addr.sin_family == AF_INET) { 275 if (td != NULL && 276 prison_check_ip4(td->td_ucred, 277 &iap->ia_addr.sin_addr) != 0) 278 continue; 279 ia = iap; 280 break; 281 } 282 } 283 if (ia == NULL) 284 iaIsFirst = 1; 285 } 286 287 switch (cmd) { 288 289 case SIOCAIFADDR: 290 case SIOCDIFADDR: 291 if (ifp == NULL) 292 return (EADDRNOTAVAIL); 293 if (ifra->ifra_addr.sin_family == AF_INET) { 294 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 295 if (ia->ia_ifp == ifp && 296 ia->ia_addr.sin_addr.s_addr == 297 ifra->ifra_addr.sin_addr.s_addr) 298 break; 299 } 300 if ((ifp->if_flags & IFF_POINTOPOINT) 301 && (cmd == SIOCAIFADDR) 302 && (ifra->ifra_dstaddr.sin_addr.s_addr 303 == INADDR_ANY)) { 304 return (EDESTADDRREQ); 305 } 306 } 307 if (cmd == SIOCDIFADDR && ia == NULL) 308 return (EADDRNOTAVAIL); 309 /* FALLTHROUGH */ 310 case SIOCSIFADDR: 311 case SIOCSIFNETMASK: 312 case SIOCSIFDSTADDR: 313 if (td != NULL) { 314 error = priv_check(td, (cmd == SIOCDIFADDR) ? 315 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 316 if (error) 317 return (error); 318 } 319 320 if (ifp == NULL) 321 return (EADDRNOTAVAIL); 322 if (ia == NULL) { 323 ia = (struct in_ifaddr *) 324 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 325 if (ia == NULL) 326 return (ENOBUFS); 327 /* 328 * Protect from ipintr() traversing address list 329 * while we're modifying it. 330 */ 331 s = splnet(); 332 ifa = &ia->ia_ifa; 333 IFA_LOCK_INIT(ifa); 334 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 335 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 336 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 337 ifa->ifa_refcnt = 1; 338 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 339 340 ia->ia_sockmask.sin_len = 8; 341 ia->ia_sockmask.sin_family = AF_INET; 342 if (ifp->if_flags & IFF_BROADCAST) { 343 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 344 ia->ia_broadaddr.sin_family = AF_INET; 345 } 346 ia->ia_ifp = ifp; 347 348 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 349 splx(s); 350 iaIsNew = 1; 351 } 352 break; 353 354 case SIOCSIFBRDADDR: 355 if (td != NULL) { 356 error = priv_check(td, PRIV_NET_ADDIFADDR); 357 if (error) 358 return (error); 359 } 360 /* FALLTHROUGH */ 361 362 case SIOCGIFADDR: 363 case SIOCGIFNETMASK: 364 case SIOCGIFDSTADDR: 365 case SIOCGIFBRDADDR: 366 if (ia == NULL) 367 return (EADDRNOTAVAIL); 368 break; 369 } 370 switch (cmd) { 371 372 case SIOCGIFADDR: 373 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 374 return (0); 375 376 case SIOCGIFBRDADDR: 377 if ((ifp->if_flags & IFF_BROADCAST) == 0) 378 return (EINVAL); 379 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 380 return (0); 381 382 case SIOCGIFDSTADDR: 383 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 384 return (EINVAL); 385 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 386 return (0); 387 388 case SIOCGIFNETMASK: 389 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 390 return (0); 391 392 case SIOCSIFDSTADDR: 393 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 394 return (EINVAL); 395 oldaddr = ia->ia_dstaddr; 396 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 397 if (ifp->if_ioctl != NULL) { 398 IFF_LOCKGIANT(ifp); 399 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 400 (caddr_t)ia); 401 IFF_UNLOCKGIANT(ifp); 402 if (error) { 403 ia->ia_dstaddr = oldaddr; 404 return (error); 405 } 406 } 407 if (ia->ia_flags & IFA_ROUTE) { 408 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 409 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 410 ia->ia_ifa.ifa_dstaddr = 411 (struct sockaddr *)&ia->ia_dstaddr; 412 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 413 } 414 return (0); 415 416 case SIOCSIFBRDADDR: 417 if ((ifp->if_flags & IFF_BROADCAST) == 0) 418 return (EINVAL); 419 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 420 return (0); 421 422 case SIOCSIFADDR: 423 error = in_ifinit(ifp, ia, 424 (struct sockaddr_in *) &ifr->ifr_addr, 1); 425 if (error != 0 && iaIsNew) 426 break; 427 if (error == 0) { 428 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST) != 0) 429 in_addmulti(&allhosts_addr, ifp); 430 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 431 } 432 return (0); 433 434 case SIOCSIFNETMASK: 435 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 436 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 437 return (0); 438 439 case SIOCAIFADDR: 440 maskIsNew = 0; 441 hostIsNew = 1; 442 error = 0; 443 if (ia->ia_addr.sin_family == AF_INET) { 444 if (ifra->ifra_addr.sin_len == 0) { 445 ifra->ifra_addr = ia->ia_addr; 446 hostIsNew = 0; 447 } else if (ifra->ifra_addr.sin_addr.s_addr == 448 ia->ia_addr.sin_addr.s_addr) 449 hostIsNew = 0; 450 } 451 if (ifra->ifra_mask.sin_len) { 452 in_ifscrub(ifp, ia); 453 ia->ia_sockmask = ifra->ifra_mask; 454 ia->ia_sockmask.sin_family = AF_INET; 455 ia->ia_subnetmask = 456 ntohl(ia->ia_sockmask.sin_addr.s_addr); 457 maskIsNew = 1; 458 } 459 if ((ifp->if_flags & IFF_POINTOPOINT) && 460 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 461 in_ifscrub(ifp, ia); 462 ia->ia_dstaddr = ifra->ifra_dstaddr; 463 maskIsNew = 1; /* We lie; but the effect's the same */ 464 } 465 if (ifra->ifra_addr.sin_family == AF_INET && 466 (hostIsNew || maskIsNew)) 467 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 468 if (error != 0 && iaIsNew) 469 break; 470 471 if ((ifp->if_flags & IFF_BROADCAST) && 472 (ifra->ifra_broadaddr.sin_family == AF_INET)) 473 ia->ia_broadaddr = ifra->ifra_broadaddr; 474 if (error == 0) { 475 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST) != 0) 476 in_addmulti(&allhosts_addr, ifp); 477 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 478 } 479 return (error); 480 481 case SIOCDIFADDR: 482 /* 483 * in_ifscrub kills the interface route. 484 */ 485 in_ifscrub(ifp, ia); 486 /* 487 * in_ifadown gets rid of all the rest of 488 * the routes. This is not quite the right 489 * thing to do, but at least if we are running 490 * a routing process they will come back. 491 */ 492 in_ifadown(&ia->ia_ifa, 1); 493 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 494 error = 0; 495 break; 496 497 default: 498 if (ifp == NULL || ifp->if_ioctl == NULL) 499 return (EOPNOTSUPP); 500 IFF_LOCKGIANT(ifp); 501 error = (*ifp->if_ioctl)(ifp, cmd, data); 502 IFF_UNLOCKGIANT(ifp); 503 return (error); 504 } 505 506 /* 507 * Protect from ipintr() traversing address list while we're modifying 508 * it. 509 */ 510 s = splnet(); 511 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 512 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 513 if (ia->ia_addr.sin_family == AF_INET) { 514 LIST_REMOVE(ia, ia_hash); 515 /* 516 * If this is the last IPv4 address configured on this 517 * interface, leave the all-hosts group. 518 * XXX: This is quite ugly because of locking and structure. 519 */ 520 oia = NULL; 521 IFP_TO_IA(ifp, oia); 522 if (oia == NULL) { 523 struct in_multi *inm; 524 525 IFF_LOCKGIANT(ifp); 526 IN_MULTI_LOCK(); 527 IN_LOOKUP_MULTI(allhosts_addr, ifp, inm); 528 if (inm != NULL) 529 in_delmulti_locked(inm); 530 IN_MULTI_UNLOCK(); 531 IFF_UNLOCKGIANT(ifp); 532 } 533 } 534 IFAFREE(&ia->ia_ifa); 535 splx(s); 536 537 return (error); 538 } 539 540 /* 541 * SIOC[GAD]LIFADDR. 542 * SIOCGLIFADDR: get first address. (?!?) 543 * SIOCGLIFADDR with IFLR_PREFIX: 544 * get first address that matches the specified prefix. 545 * SIOCALIFADDR: add the specified address. 546 * SIOCALIFADDR with IFLR_PREFIX: 547 * EINVAL since we can't deduce hostid part of the address. 548 * SIOCDLIFADDR: delete the specified address. 549 * SIOCDLIFADDR with IFLR_PREFIX: 550 * delete the first address that matches the specified prefix. 551 * return values: 552 * EINVAL on invalid parameters 553 * EADDRNOTAVAIL on prefix match failed/specified address not found 554 * other values may be returned from in_ioctl() 555 */ 556 static int 557 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 558 struct ifnet *ifp, struct thread *td) 559 { 560 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 561 struct ifaddr *ifa; 562 563 /* sanity checks */ 564 if (data == NULL || ifp == NULL) { 565 panic("invalid argument to in_lifaddr_ioctl"); 566 /*NOTRECHED*/ 567 } 568 569 switch (cmd) { 570 case SIOCGLIFADDR: 571 /* address must be specified on GET with IFLR_PREFIX */ 572 if ((iflr->flags & IFLR_PREFIX) == 0) 573 break; 574 /*FALLTHROUGH*/ 575 case SIOCALIFADDR: 576 case SIOCDLIFADDR: 577 /* address must be specified on ADD and DELETE */ 578 if (iflr->addr.ss_family != AF_INET) 579 return (EINVAL); 580 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 581 return (EINVAL); 582 /* XXX need improvement */ 583 if (iflr->dstaddr.ss_family 584 && iflr->dstaddr.ss_family != AF_INET) 585 return (EINVAL); 586 if (iflr->dstaddr.ss_family 587 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 588 return (EINVAL); 589 break; 590 default: /*shouldn't happen*/ 591 return (EOPNOTSUPP); 592 } 593 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 594 return (EINVAL); 595 596 switch (cmd) { 597 case SIOCALIFADDR: 598 { 599 struct in_aliasreq ifra; 600 601 if (iflr->flags & IFLR_PREFIX) 602 return (EINVAL); 603 604 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 605 bzero(&ifra, sizeof(ifra)); 606 bcopy(iflr->iflr_name, ifra.ifra_name, 607 sizeof(ifra.ifra_name)); 608 609 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 610 611 if (iflr->dstaddr.ss_family) { /*XXX*/ 612 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 613 iflr->dstaddr.ss_len); 614 } 615 616 ifra.ifra_mask.sin_family = AF_INET; 617 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 618 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 619 620 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 621 } 622 case SIOCGLIFADDR: 623 case SIOCDLIFADDR: 624 { 625 struct in_ifaddr *ia; 626 struct in_addr mask, candidate, match; 627 struct sockaddr_in *sin; 628 629 bzero(&mask, sizeof(mask)); 630 bzero(&match, sizeof(match)); 631 if (iflr->flags & IFLR_PREFIX) { 632 /* lookup a prefix rather than address. */ 633 in_len2mask(&mask, iflr->prefixlen); 634 635 sin = (struct sockaddr_in *)&iflr->addr; 636 match.s_addr = sin->sin_addr.s_addr; 637 match.s_addr &= mask.s_addr; 638 639 /* if you set extra bits, that's wrong */ 640 if (match.s_addr != sin->sin_addr.s_addr) 641 return (EINVAL); 642 643 } else { 644 /* on getting an address, take the 1st match */ 645 /* on deleting an address, do exact match */ 646 if (cmd != SIOCGLIFADDR) { 647 in_len2mask(&mask, 32); 648 sin = (struct sockaddr_in *)&iflr->addr; 649 match.s_addr = sin->sin_addr.s_addr; 650 } 651 } 652 653 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 654 if (ifa->ifa_addr->sa_family != AF_INET6) 655 continue; 656 if (match.s_addr == 0) 657 break; 658 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 659 candidate.s_addr &= mask.s_addr; 660 if (candidate.s_addr == match.s_addr) 661 break; 662 } 663 if (ifa == NULL) 664 return (EADDRNOTAVAIL); 665 ia = (struct in_ifaddr *)ifa; 666 667 if (cmd == SIOCGLIFADDR) { 668 /* fill in the if_laddrreq structure */ 669 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 670 671 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 672 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 673 ia->ia_dstaddr.sin_len); 674 } else 675 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 676 677 iflr->prefixlen = 678 in_mask2len(&ia->ia_sockmask.sin_addr); 679 680 iflr->flags = 0; /*XXX*/ 681 682 return (0); 683 } else { 684 struct in_aliasreq ifra; 685 686 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 687 bzero(&ifra, sizeof(ifra)); 688 bcopy(iflr->iflr_name, ifra.ifra_name, 689 sizeof(ifra.ifra_name)); 690 691 bcopy(&ia->ia_addr, &ifra.ifra_addr, 692 ia->ia_addr.sin_len); 693 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 694 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 695 ia->ia_dstaddr.sin_len); 696 } 697 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 698 ia->ia_sockmask.sin_len); 699 700 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 701 ifp, td)); 702 } 703 } 704 } 705 706 return (EOPNOTSUPP); /*just for safety*/ 707 } 708 709 /* 710 * Delete any existing route for an interface. 711 */ 712 void 713 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 714 { 715 716 in_scrubprefix(ia); 717 } 718 719 /* 720 * Initialize an interface's internet address 721 * and routing table entry. 722 */ 723 static int 724 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 725 int scrub) 726 { 727 INIT_VNET_INET(ifp->if_vnet); 728 register u_long i = ntohl(sin->sin_addr.s_addr); 729 struct sockaddr_in oldaddr; 730 int s = splimp(), flags = RTF_UP, error = 0; 731 732 oldaddr = ia->ia_addr; 733 if (oldaddr.sin_family == AF_INET) 734 LIST_REMOVE(ia, ia_hash); 735 ia->ia_addr = *sin; 736 if (ia->ia_addr.sin_family == AF_INET) 737 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 738 ia, ia_hash); 739 /* 740 * Give the interface a chance to initialize 741 * if this is its first address, 742 * and to validate the address if necessary. 743 */ 744 if (ifp->if_ioctl != NULL) { 745 IFF_LOCKGIANT(ifp); 746 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 747 IFF_UNLOCKGIANT(ifp); 748 if (error) { 749 splx(s); 750 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 751 ia->ia_addr = oldaddr; 752 if (ia->ia_addr.sin_family == AF_INET) 753 LIST_INSERT_HEAD(INADDR_HASH( 754 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 755 else 756 /* 757 * If oldaddr family is not AF_INET (e.g. 758 * interface has been just created) in_control 759 * does not call LIST_REMOVE, and we end up 760 * with bogus ia entries in hash 761 */ 762 LIST_REMOVE(ia, ia_hash); 763 return (error); 764 } 765 } 766 splx(s); 767 if (scrub) { 768 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 769 in_ifscrub(ifp, ia); 770 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 771 } 772 if (IN_CLASSA(i)) 773 ia->ia_netmask = IN_CLASSA_NET; 774 else if (IN_CLASSB(i)) 775 ia->ia_netmask = IN_CLASSB_NET; 776 else 777 ia->ia_netmask = IN_CLASSC_NET; 778 /* 779 * The subnet mask usually includes at least the standard network part, 780 * but may may be smaller in the case of supernetting. 781 * If it is set, we believe it. 782 */ 783 if (ia->ia_subnetmask == 0) { 784 ia->ia_subnetmask = ia->ia_netmask; 785 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 786 } else 787 ia->ia_netmask &= ia->ia_subnetmask; 788 ia->ia_net = i & ia->ia_netmask; 789 ia->ia_subnet = i & ia->ia_subnetmask; 790 in_socktrim(&ia->ia_sockmask); 791 #ifdef DEV_CARP 792 /* 793 * XXX: carp(4) does not have interface route 794 */ 795 if (ifp->if_type == IFT_CARP) 796 return (0); 797 #endif 798 /* 799 * Add route for the network. 800 */ 801 ia->ia_ifa.ifa_metric = ifp->if_metric; 802 if (ifp->if_flags & IFF_BROADCAST) { 803 ia->ia_broadaddr.sin_addr.s_addr = 804 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 805 ia->ia_netbroadcast.s_addr = 806 htonl(ia->ia_net | ~ ia->ia_netmask); 807 } else if (ifp->if_flags & IFF_LOOPBACK) { 808 ia->ia_dstaddr = ia->ia_addr; 809 flags |= RTF_HOST; 810 } else if (ifp->if_flags & IFF_POINTOPOINT) { 811 if (ia->ia_dstaddr.sin_family != AF_INET) 812 return (0); 813 flags |= RTF_HOST; 814 } 815 if ((error = in_addprefix(ia, flags)) != 0) 816 return (error); 817 818 return (error); 819 } 820 821 #define rtinitflags(x) \ 822 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 823 ? RTF_HOST : 0) 824 /* 825 * Check if we have a route for the given prefix already or add one accordingly. 826 */ 827 static int 828 in_addprefix(struct in_ifaddr *target, int flags) 829 { 830 INIT_VNET_INET(curvnet); 831 struct in_ifaddr *ia; 832 struct in_addr prefix, mask, p, m; 833 int error; 834 835 if ((flags & RTF_HOST) != 0) { 836 prefix = target->ia_dstaddr.sin_addr; 837 mask.s_addr = 0; 838 } else { 839 prefix = target->ia_addr.sin_addr; 840 mask = target->ia_sockmask.sin_addr; 841 prefix.s_addr &= mask.s_addr; 842 } 843 844 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 845 if (rtinitflags(ia)) { 846 p = ia->ia_addr.sin_addr; 847 848 if (prefix.s_addr != p.s_addr) 849 continue; 850 } else { 851 p = ia->ia_addr.sin_addr; 852 m = ia->ia_sockmask.sin_addr; 853 p.s_addr &= m.s_addr; 854 855 if (prefix.s_addr != p.s_addr || 856 mask.s_addr != m.s_addr) 857 continue; 858 } 859 860 /* 861 * If we got a matching prefix route inserted by other 862 * interface address, we are done here. 863 */ 864 if (ia->ia_flags & IFA_ROUTE) { 865 if (V_sameprefixcarponly && 866 target->ia_ifp->if_type != IFT_CARP && 867 ia->ia_ifp->if_type != IFT_CARP) 868 return (EEXIST); 869 else 870 return (0); 871 } 872 } 873 874 /* 875 * No-one seem to have this prefix route, so we try to insert it. 876 */ 877 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 878 if (!error) 879 target->ia_flags |= IFA_ROUTE; 880 return (error); 881 } 882 883 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 884 885 /* 886 * If there is no other address in the system that can serve a route to the 887 * same prefix, remove the route. Hand over the route to the new address 888 * otherwise. 889 */ 890 static int 891 in_scrubprefix(struct in_ifaddr *target) 892 { 893 INIT_VNET_INET(curvnet); 894 struct in_ifaddr *ia; 895 struct in_addr prefix, mask, p; 896 int error; 897 898 if ((target->ia_flags & IFA_ROUTE) == 0) 899 return (0); 900 901 if (rtinitflags(target)) 902 prefix = target->ia_dstaddr.sin_addr; 903 else { 904 prefix = target->ia_addr.sin_addr; 905 mask = target->ia_sockmask.sin_addr; 906 prefix.s_addr &= mask.s_addr; 907 /* remove arp cache */ 908 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 909 } 910 911 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 912 if (rtinitflags(ia)) 913 p = ia->ia_dstaddr.sin_addr; 914 else { 915 p = ia->ia_addr.sin_addr; 916 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 917 } 918 919 if (prefix.s_addr != p.s_addr) 920 continue; 921 922 /* 923 * If we got a matching prefix address, move IFA_ROUTE and 924 * the route itself to it. Make sure that routing daemons 925 * get a heads-up. 926 * 927 * XXX: a special case for carp(4) interface 928 */ 929 if ((ia->ia_flags & IFA_ROUTE) == 0 930 #ifdef DEV_CARP 931 && (ia->ia_ifp->if_type != IFT_CARP) 932 #endif 933 ) { 934 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 935 rtinitflags(target)); 936 target->ia_flags &= ~IFA_ROUTE; 937 938 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 939 rtinitflags(ia) | RTF_UP); 940 if (error == 0) 941 ia->ia_flags |= IFA_ROUTE; 942 return (error); 943 } 944 } 945 946 /* 947 * As no-one seem to have this prefix, we can remove the route. 948 */ 949 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 950 target->ia_flags &= ~IFA_ROUTE; 951 return (0); 952 } 953 954 #undef rtinitflags 955 956 /* 957 * Return 1 if the address might be a local broadcast address. 958 */ 959 int 960 in_broadcast(struct in_addr in, struct ifnet *ifp) 961 { 962 register struct ifaddr *ifa; 963 u_long t; 964 965 if (in.s_addr == INADDR_BROADCAST || 966 in.s_addr == INADDR_ANY) 967 return (1); 968 if ((ifp->if_flags & IFF_BROADCAST) == 0) 969 return (0); 970 t = ntohl(in.s_addr); 971 /* 972 * Look through the list of addresses for a match 973 * with a broadcast address. 974 */ 975 #define ia ((struct in_ifaddr *)ifa) 976 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 977 if (ifa->ifa_addr->sa_family == AF_INET && 978 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 979 in.s_addr == ia->ia_netbroadcast.s_addr || 980 /* 981 * Check for old-style (host 0) broadcast. 982 */ 983 t == ia->ia_subnet || t == ia->ia_net) && 984 /* 985 * Check for an all one subnetmask. These 986 * only exist when an interface gets a secondary 987 * address. 988 */ 989 ia->ia_subnetmask != (u_long)0xffffffff) 990 return (1); 991 return (0); 992 #undef ia 993 } 994 995 /* 996 * Delete all IPv4 multicast address records, and associated link-layer 997 * multicast address records, associated with ifp. 998 */ 999 static void 1000 in_purgemaddrs(struct ifnet *ifp) 1001 { 1002 INIT_VNET_INET(ifp->if_vnet); 1003 struct in_multi *inm; 1004 struct in_multi *oinm; 1005 1006 IFF_LOCKGIANT(ifp); 1007 IN_MULTI_LOCK(); 1008 LIST_FOREACH_SAFE(inm, &V_in_multihead, inm_link, oinm) { 1009 if (inm->inm_ifp == ifp) 1010 in_delmulti_locked(inm); 1011 } 1012 IN_MULTI_UNLOCK(); 1013 IFF_UNLOCKGIANT(ifp); 1014 } 1015 1016 /* 1017 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1018 */ 1019 void 1020 in_ifdetach(struct ifnet *ifp) 1021 { 1022 INIT_VNET_INET(ifp->if_vnet); 1023 1024 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1025 in_pcbpurgeif0(&V_udbinfo, ifp); 1026 in_purgemaddrs(ifp); 1027 } 1028 1029 #include <sys/syslog.h> 1030 #include <net/if_dl.h> 1031 #include <netinet/if_ether.h> 1032 1033 struct in_llentry { 1034 struct llentry base; 1035 struct sockaddr_in l3_addr4; 1036 }; 1037 1038 static struct llentry * 1039 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1040 { 1041 struct in_llentry *lle; 1042 1043 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1044 if (lle == NULL) /* NB: caller generates msg */ 1045 return NULL; 1046 1047 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1048 /* 1049 * For IPv4 this will trigger "arpresolve" to generate 1050 * an ARP request. 1051 */ 1052 lle->base.la_expire = time_second; /* mark expired */ 1053 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1054 lle->base.lle_refcnt = 1; 1055 LLE_LOCK_INIT(&lle->base); 1056 return &lle->base; 1057 } 1058 1059 /* 1060 * Deletes an address from the address table. 1061 * This function is called by the timer functions 1062 * such as arptimer() and nd6_llinfo_timer(), and 1063 * the caller does the locking. 1064 */ 1065 static void 1066 in_lltable_free(struct lltable *llt, struct llentry *lle) 1067 { 1068 LLE_WUNLOCK(lle); 1069 LLE_LOCK_DESTROY(lle); 1070 free(lle, M_LLTABLE); 1071 } 1072 1073 static int 1074 in_lltable_rtcheck(struct ifnet *ifp, const struct sockaddr *l3addr) 1075 { 1076 struct rtentry *rt; 1077 1078 KASSERT(l3addr->sa_family == AF_INET, 1079 ("sin_family %d", l3addr->sa_family)); 1080 1081 /* XXX rtalloc1 should take a const param */ 1082 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1083 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 1084 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1085 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1086 if (rt != NULL) 1087 RTFREE_LOCKED(rt); 1088 return (EINVAL); 1089 } 1090 RTFREE_LOCKED(rt); 1091 return 0; 1092 } 1093 1094 /* 1095 * Return NULL if not found or marked for deletion. 1096 * If found return lle read locked. 1097 */ 1098 static struct llentry * 1099 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1100 { 1101 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1102 struct ifnet *ifp = llt->llt_ifp; 1103 struct llentry *lle; 1104 struct llentries *lleh; 1105 u_int hashkey; 1106 1107 IF_AFDATA_LOCK_ASSERT(ifp); 1108 KASSERT(l3addr->sa_family == AF_INET, 1109 ("sin_family %d", l3addr->sa_family)); 1110 1111 hashkey = sin->sin_addr.s_addr; 1112 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1113 LIST_FOREACH(lle, lleh, lle_next) { 1114 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1115 if (lle->la_flags & LLE_DELETED) 1116 continue; 1117 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1118 break; 1119 } 1120 if (lle == NULL) { 1121 #ifdef DIAGNOSTICS 1122 if (flags & LLE_DELETE) 1123 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1124 #endif 1125 if (!(flags & LLE_CREATE)) 1126 return (NULL); 1127 /* 1128 * A route that covers the given address must have 1129 * been installed 1st because we are doing a resolution, 1130 * verify this. 1131 */ 1132 if (!(flags & LLE_IFADDR) && 1133 in_lltable_rtcheck(ifp, l3addr) != 0) 1134 goto done; 1135 1136 lle = in_lltable_new(l3addr, flags); 1137 if (lle == NULL) { 1138 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1139 goto done; 1140 } 1141 lle->la_flags = flags & ~LLE_CREATE; 1142 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1143 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1144 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1145 } 1146 1147 lle->lle_tbl = llt; 1148 lle->lle_head = lleh; 1149 LIST_INSERT_HEAD(lleh, lle, lle_next); 1150 } else if (flags & LLE_DELETE) { 1151 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1152 LLE_WLOCK(lle); 1153 lle->la_flags = LLE_DELETED; 1154 LLE_WUNLOCK(lle); 1155 #ifdef DIAGNOSTICS 1156 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1157 #endif 1158 } 1159 lle = (void *)-1; 1160 1161 } 1162 if (LLE_IS_VALID(lle)) { 1163 if (flags & LLE_EXCLUSIVE) 1164 LLE_WLOCK(lle); 1165 else 1166 LLE_RLOCK(lle); 1167 } 1168 done: 1169 return (lle); 1170 } 1171 1172 static int 1173 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1174 { 1175 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1176 struct ifnet *ifp = llt->llt_ifp; 1177 struct llentry *lle; 1178 /* XXX stack use */ 1179 struct { 1180 struct rt_msghdr rtm; 1181 struct sockaddr_inarp sin; 1182 struct sockaddr_dl sdl; 1183 } arpc; 1184 int error, i; 1185 1186 /* XXXXX 1187 * current IFNET_RLOCK() is mapped to IFNET_WLOCK() 1188 * so it is okay to use this ASSERT, change it when 1189 * IFNET lock is finalized 1190 */ 1191 IFNET_WLOCK_ASSERT(); 1192 1193 error = 0; 1194 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1195 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1196 struct sockaddr_dl *sdl; 1197 1198 /* skip deleted entries */ 1199 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 1200 continue; 1201 /* Skip if jailed and not a valid IP of the prison. */ 1202 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1203 continue; 1204 /* 1205 * produce a msg made of: 1206 * struct rt_msghdr; 1207 * struct sockaddr_inarp; (IPv4) 1208 * struct sockaddr_dl; 1209 */ 1210 bzero(&arpc, sizeof(arpc)); 1211 arpc.rtm.rtm_msglen = sizeof(arpc); 1212 arpc.rtm.rtm_version = RTM_VERSION; 1213 arpc.rtm.rtm_type = RTM_GET; 1214 arpc.rtm.rtm_flags = RTF_UP; 1215 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1216 arpc.sin.sin_family = AF_INET; 1217 arpc.sin.sin_len = sizeof(arpc.sin); 1218 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1219 1220 /* publish */ 1221 if (lle->la_flags & LLE_PUB) { 1222 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1223 /* proxy only */ 1224 if (lle->la_flags & LLE_PROXY) 1225 arpc.sin.sin_other = SIN_PROXY; 1226 } 1227 1228 sdl = &arpc.sdl; 1229 sdl->sdl_family = AF_LINK; 1230 sdl->sdl_len = sizeof(*sdl); 1231 sdl->sdl_alen = ifp->if_addrlen; 1232 sdl->sdl_index = ifp->if_index; 1233 sdl->sdl_type = ifp->if_type; 1234 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1235 1236 arpc.rtm.rtm_rmx.rmx_expire = 1237 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1238 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1239 if (lle->la_flags & LLE_STATIC) 1240 arpc.rtm.rtm_flags |= RTF_STATIC; 1241 arpc.rtm.rtm_index = ifp->if_index; 1242 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1243 if (error) 1244 break; 1245 } 1246 } 1247 return error; 1248 #undef SIN 1249 } 1250 1251 void * 1252 in_domifattach(struct ifnet *ifp) 1253 { 1254 struct lltable *llt = lltable_init(ifp, AF_INET); 1255 1256 if (llt != NULL) { 1257 llt->llt_new = in_lltable_new; 1258 llt->llt_free = in_lltable_free; 1259 llt->llt_rtcheck = in_lltable_rtcheck; 1260 llt->llt_lookup = in_lltable_lookup; 1261 llt->llt_dump = in_lltable_dump; 1262 } 1263 return (llt); 1264 } 1265 1266 void 1267 in_domifdetach(struct ifnet *ifp __unused, void *aux) 1268 { 1269 struct lltable *llt = (struct lltable *)aux; 1270 1271 lltable_free(llt); 1272 } 1273