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_mpath.h" 37 38 #include <sys/param.h> 39 #include <sys/eventhandler.h> 40 #include <sys/systm.h> 41 #include <sys/sockio.h> 42 #include <sys/malloc.h> 43 #include <sys/priv.h> 44 #include <sys/socket.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 #include <sys/syslog.h> 50 #include <sys/sx.h> 51 52 #include <net/if.h> 53 #include <net/if_var.h> 54 #include <net/if_arp.h> 55 #include <net/if_dl.h> 56 #include <net/if_llatbl.h> 57 #include <net/if_types.h> 58 #include <net/route.h> 59 #include <net/vnet.h> 60 61 #include <netinet/if_ether.h> 62 #include <netinet/in.h> 63 #include <netinet/in_var.h> 64 #include <netinet/in_pcb.h> 65 #include <netinet/ip_var.h> 66 #include <netinet/ip_carp.h> 67 #include <netinet/igmp_var.h> 68 #include <netinet/udp.h> 69 #include <netinet/udp_var.h> 70 71 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *); 72 static int in_difaddr_ioctl(caddr_t, struct ifnet *, struct thread *); 73 74 static void in_socktrim(struct sockaddr_in *); 75 static void in_purgemaddrs(struct ifnet *); 76 77 static VNET_DEFINE(int, nosameprefix); 78 #define V_nosameprefix VNET(nosameprefix) 79 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_RW, 80 &VNET_NAME(nosameprefix), 0, 81 "Refuse to create same prefixes on different interfaces"); 82 83 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 84 #define V_ripcbinfo VNET(ripcbinfo) 85 86 static struct sx in_control_sx; 87 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control"); 88 89 /* 90 * Return 1 if an internet address is for a ``local'' host 91 * (one to which we have a connection). 92 */ 93 int 94 in_localaddr(struct in_addr in) 95 { 96 register u_long i = ntohl(in.s_addr); 97 register struct in_ifaddr *ia; 98 99 IN_IFADDR_RLOCK(); 100 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 101 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 102 IN_IFADDR_RUNLOCK(); 103 return (1); 104 } 105 } 106 IN_IFADDR_RUNLOCK(); 107 return (0); 108 } 109 110 /* 111 * Return 1 if an internet address is for the local host and configured 112 * on one of its interfaces. 113 */ 114 int 115 in_localip(struct in_addr in) 116 { 117 struct in_ifaddr *ia; 118 119 IN_IFADDR_RLOCK(); 120 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 121 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 122 IN_IFADDR_RUNLOCK(); 123 return (1); 124 } 125 } 126 IN_IFADDR_RUNLOCK(); 127 return (0); 128 } 129 130 /* 131 * Return a reference to the interface address which is different to 132 * the supplied one but with same IP address value. 133 */ 134 static struct in_ifaddr * 135 in_localip_more(struct in_ifaddr *ia) 136 { 137 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr; 138 struct in_ifaddr *it; 139 140 IN_IFADDR_RLOCK(); 141 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) { 142 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) { 143 ifa_ref(&it->ia_ifa); 144 IN_IFADDR_RUNLOCK(); 145 return (it); 146 } 147 } 148 IN_IFADDR_RUNLOCK(); 149 150 return (NULL); 151 } 152 153 /* 154 * Determine whether an IP address is in a reserved set of addresses 155 * that may not be forwarded, or whether datagrams to that destination 156 * may be forwarded. 157 */ 158 int 159 in_canforward(struct in_addr in) 160 { 161 register u_long i = ntohl(in.s_addr); 162 register u_long net; 163 164 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 165 return (0); 166 if (IN_CLASSA(i)) { 167 net = i & IN_CLASSA_NET; 168 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 169 return (0); 170 } 171 return (1); 172 } 173 174 /* 175 * Trim a mask in a sockaddr 176 */ 177 static void 178 in_socktrim(struct sockaddr_in *ap) 179 { 180 register char *cplim = (char *) &ap->sin_addr; 181 register char *cp = (char *) (&ap->sin_addr + 1); 182 183 ap->sin_len = 0; 184 while (--cp >= cplim) 185 if (*cp) { 186 (ap)->sin_len = cp - (char *) (ap) + 1; 187 break; 188 } 189 } 190 191 /* 192 * Generic internet control operations (ioctl's). 193 */ 194 int 195 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 196 struct thread *td) 197 { 198 struct ifreq *ifr = (struct ifreq *)data; 199 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr; 200 struct ifaddr *ifa; 201 struct in_ifaddr *ia; 202 int error; 203 204 if (ifp == NULL) 205 return (EADDRNOTAVAIL); 206 207 /* 208 * Filter out 4 ioctls we implement directly. Forward the rest 209 * to specific functions and ifp->if_ioctl(). 210 */ 211 switch (cmd) { 212 case SIOCGIFADDR: 213 case SIOCGIFBRDADDR: 214 case SIOCGIFDSTADDR: 215 case SIOCGIFNETMASK: 216 break; 217 case SIOCDIFADDR: 218 sx_xlock(&in_control_sx); 219 error = in_difaddr_ioctl(data, ifp, td); 220 sx_xunlock(&in_control_sx); 221 return (error); 222 case OSIOCAIFADDR: /* 9.x compat */ 223 case SIOCAIFADDR: 224 sx_xlock(&in_control_sx); 225 error = in_aifaddr_ioctl(cmd, data, ifp, td); 226 sx_xunlock(&in_control_sx); 227 return (error); 228 case SIOCSIFADDR: 229 case SIOCSIFBRDADDR: 230 case SIOCSIFDSTADDR: 231 case SIOCSIFNETMASK: 232 /* We no longer support that old commands. */ 233 return (EINVAL); 234 default: 235 if (ifp->if_ioctl == NULL) 236 return (EOPNOTSUPP); 237 return ((*ifp->if_ioctl)(ifp, cmd, data)); 238 } 239 240 if (addr->sin_addr.s_addr != INADDR_ANY && 241 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0) 242 return (EADDRNOTAVAIL); 243 244 /* 245 * For SIOCGIFADDR, pick the first address. For the rest of 246 * ioctls, try to find specified address. 247 */ 248 IF_ADDR_RLOCK(ifp); 249 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 250 ia = (struct in_ifaddr *)ifa; 251 if (cmd == SIOCGIFADDR || addr->sin_addr.s_addr == INADDR_ANY) 252 break; 253 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr) 254 break; 255 } 256 257 if (ifa == NULL) { 258 IF_ADDR_RUNLOCK(ifp); 259 return (EADDRNOTAVAIL); 260 } 261 262 error = 0; 263 switch (cmd) { 264 case SIOCGIFADDR: 265 *addr = ia->ia_addr; 266 break; 267 268 case SIOCGIFBRDADDR: 269 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 270 error = EINVAL; 271 break; 272 } 273 *addr = ia->ia_broadaddr; 274 break; 275 276 case SIOCGIFDSTADDR: 277 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 278 error = EINVAL; 279 break; 280 } 281 *addr = ia->ia_dstaddr; 282 break; 283 284 case SIOCGIFNETMASK: 285 *addr = ia->ia_sockmask; 286 break; 287 } 288 289 IF_ADDR_RUNLOCK(ifp); 290 291 return (error); 292 } 293 294 static int 295 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 296 { 297 const struct in_aliasreq *ifra = (struct in_aliasreq *)data; 298 const struct sockaddr_in *addr = &ifra->ifra_addr; 299 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr; 300 const struct sockaddr_in *mask = &ifra->ifra_mask; 301 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr; 302 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0; 303 struct ifaddr *ifa; 304 struct in_ifaddr *ia; 305 bool iaIsFirst; 306 int error = 0; 307 308 error = priv_check(td, PRIV_NET_ADDIFADDR); 309 if (error) 310 return (error); 311 312 /* 313 * ifra_addr must be present and be of INET family. 314 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional. 315 */ 316 if (addr->sin_len != sizeof(struct sockaddr_in) || 317 addr->sin_family != AF_INET) 318 return (EINVAL); 319 if (broadaddr->sin_len != 0 && 320 (broadaddr->sin_len != sizeof(struct sockaddr_in) || 321 broadaddr->sin_family != AF_INET)) 322 return (EINVAL); 323 if (mask->sin_len != 0 && 324 (mask->sin_len != sizeof(struct sockaddr_in) || 325 mask->sin_family != AF_INET)) 326 return (EINVAL); 327 if ((ifp->if_flags & IFF_POINTOPOINT) && 328 (dstaddr->sin_len != sizeof(struct sockaddr_in) || 329 dstaddr->sin_addr.s_addr == INADDR_ANY)) 330 return (EDESTADDRREQ); 331 if (vhid > 0 && carp_attach_p == NULL) 332 return (EPROTONOSUPPORT); 333 334 /* 335 * See whether address already exist. 336 */ 337 iaIsFirst = true; 338 ia = NULL; 339 IF_ADDR_RLOCK(ifp); 340 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 341 struct in_ifaddr *it = ifatoia(ifa); 342 343 if (it->ia_addr.sin_family != AF_INET) 344 continue; 345 346 iaIsFirst = false; 347 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 348 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) 349 ia = it; 350 } 351 IF_ADDR_RUNLOCK(ifp); 352 353 if (ia != NULL) 354 (void )in_difaddr_ioctl(data, ifp, td); 355 356 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK); 357 ia = (struct in_ifaddr *)ifa; 358 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 359 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 360 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 361 362 ia->ia_ifp = ifp; 363 ia->ia_ifa.ifa_metric = ifp->if_metric; 364 ia->ia_addr = *addr; 365 if (mask->sin_len != 0) { 366 ia->ia_sockmask = *mask; 367 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 368 } else { 369 in_addr_t i = ntohl(addr->sin_addr.s_addr); 370 371 /* 372 * Be compatible with network classes, if netmask isn't 373 * supplied, guess it based on classes. 374 */ 375 if (IN_CLASSA(i)) 376 ia->ia_subnetmask = IN_CLASSA_NET; 377 else if (IN_CLASSB(i)) 378 ia->ia_subnetmask = IN_CLASSB_NET; 379 else 380 ia->ia_subnetmask = IN_CLASSC_NET; 381 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 382 } 383 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask; 384 in_socktrim(&ia->ia_sockmask); 385 386 if (ifp->if_flags & IFF_BROADCAST) { 387 if (broadaddr->sin_len != 0) { 388 ia->ia_broadaddr = *broadaddr; 389 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) { 390 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 391 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 392 ia->ia_broadaddr.sin_family = AF_INET; 393 } else { 394 ia->ia_broadaddr.sin_addr.s_addr = 395 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 396 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 397 ia->ia_broadaddr.sin_family = AF_INET; 398 } 399 } 400 401 if (ifp->if_flags & IFF_POINTOPOINT) 402 ia->ia_dstaddr = *dstaddr; 403 404 /* XXXGL: rtinit() needs this strange assignment. */ 405 if (ifp->if_flags & IFF_LOOPBACK) 406 ia->ia_dstaddr = ia->ia_addr; 407 408 ifa_ref(ifa); /* if_addrhead */ 409 IF_ADDR_WLOCK(ifp); 410 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 411 IF_ADDR_WUNLOCK(ifp); 412 413 ifa_ref(ifa); /* in_ifaddrhead */ 414 IN_IFADDR_WLOCK(); 415 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 416 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 417 IN_IFADDR_WUNLOCK(); 418 419 if (vhid != 0) 420 error = (*carp_attach_p)(&ia->ia_ifa, vhid); 421 if (error) 422 goto fail1; 423 424 /* 425 * Give the interface a chance to initialize 426 * if this is its first address, 427 * and to validate the address if necessary. 428 */ 429 if (ifp->if_ioctl != NULL) 430 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 431 if (error) 432 goto fail2; 433 434 /* 435 * Add route for the network. 436 */ 437 if (vhid == 0) { 438 int flags = RTF_UP; 439 440 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 441 flags |= RTF_HOST; 442 443 error = in_addprefix(ia, flags); 444 if (error) 445 goto fail2; 446 } 447 448 /* 449 * Add a loopback route to self. 450 */ 451 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 && 452 ia->ia_addr.sin_addr.s_addr != INADDR_ANY) { 453 struct in_ifaddr *eia; 454 455 eia = in_localip_more(ia); 456 457 if (eia == NULL) { 458 error = ifa_add_loopback_route((struct ifaddr *)ia, 459 (struct sockaddr *)&ia->ia_addr); 460 if (error) 461 goto fail3; 462 } else 463 ifa_free(&eia->ia_ifa); 464 } 465 466 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) { 467 struct in_addr allhosts_addr; 468 struct in_ifinfo *ii; 469 470 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 471 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 472 473 error = in_joingroup(ifp, &allhosts_addr, NULL, 474 &ii->ii_allhosts); 475 } 476 477 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 478 479 return (error); 480 481 fail3: 482 if (vhid == 0) 483 (void )in_scrubprefix(ia, LLE_STATIC); 484 485 fail2: 486 if (ia->ia_ifa.ifa_carp) 487 (*carp_detach_p)(&ia->ia_ifa); 488 489 fail1: 490 IF_ADDR_WLOCK(ifp); 491 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 492 IF_ADDR_WUNLOCK(ifp); 493 ifa_free(&ia->ia_ifa); 494 495 IN_IFADDR_WLOCK(); 496 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 497 LIST_REMOVE(ia, ia_hash); 498 IN_IFADDR_WUNLOCK(); 499 ifa_free(&ia->ia_ifa); 500 501 return (error); 502 } 503 504 static int 505 in_difaddr_ioctl(caddr_t data, struct ifnet *ifp, struct thread *td) 506 { 507 const struct ifreq *ifr = (struct ifreq *)data; 508 const struct sockaddr_in *addr = (const struct sockaddr_in *) 509 &ifr->ifr_addr; 510 struct ifaddr *ifa; 511 struct in_ifaddr *ia; 512 bool deleteAny, iaIsLast; 513 int error; 514 515 if (td != NULL) { 516 error = priv_check(td, PRIV_NET_DELIFADDR); 517 if (error) 518 return (error); 519 } 520 521 if (addr->sin_len != sizeof(struct sockaddr_in) || 522 addr->sin_family != AF_INET) 523 deleteAny = true; 524 else 525 deleteAny = false; 526 527 iaIsLast = true; 528 ia = NULL; 529 IF_ADDR_WLOCK(ifp); 530 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 531 struct in_ifaddr *it = ifatoia(ifa); 532 533 if (it->ia_addr.sin_family != AF_INET) 534 continue; 535 536 if (deleteAny && ia == NULL && (td == NULL || 537 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0)) 538 ia = it; 539 540 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 541 (td == NULL || prison_check_ip4(td->td_ucred, 542 &addr->sin_addr) == 0)) 543 ia = it; 544 545 if (it != ia) 546 iaIsLast = false; 547 } 548 549 if (ia == NULL) { 550 IF_ADDR_WUNLOCK(ifp); 551 return (EADDRNOTAVAIL); 552 } 553 554 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 555 IF_ADDR_WUNLOCK(ifp); 556 ifa_free(&ia->ia_ifa); /* if_addrhead */ 557 558 IN_IFADDR_WLOCK(); 559 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 560 LIST_REMOVE(ia, ia_hash); 561 IN_IFADDR_WUNLOCK(); 562 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 563 564 /* 565 * in_scrubprefix() kills the interface route. 566 */ 567 in_scrubprefix(ia, LLE_STATIC); 568 569 /* 570 * in_ifadown gets rid of all the rest of 571 * the routes. This is not quite the right 572 * thing to do, but at least if we are running 573 * a routing process they will come back. 574 */ 575 in_ifadown(&ia->ia_ifa, 1); 576 577 if (ia->ia_ifa.ifa_carp) 578 (*carp_detach_p)(&ia->ia_ifa); 579 580 /* 581 * If this is the last IPv4 address configured on this 582 * interface, leave the all-hosts group. 583 * No state-change report need be transmitted. 584 */ 585 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) { 586 struct in_ifinfo *ii; 587 588 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 589 IN_MULTI_LOCK(); 590 if (ii->ii_allhosts) { 591 (void)in_leavegroup_locked(ii->ii_allhosts, NULL); 592 ii->ii_allhosts = NULL; 593 } 594 IN_MULTI_UNLOCK(); 595 } 596 597 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 598 599 return (0); 600 } 601 602 #define rtinitflags(x) \ 603 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 604 ? RTF_HOST : 0) 605 606 /* 607 * Generate a routing message when inserting or deleting 608 * an interface address alias. 609 */ 610 static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, 611 struct in_ifaddr *target) 612 { 613 struct route pfx_ro; 614 struct sockaddr_in *pfx_addr; 615 struct rtentry msg_rt; 616 617 /* QL: XXX 618 * This is a bit questionable because there is no 619 * additional route entry added/deleted for an address 620 * alias. Therefore this route report is inaccurate. 621 */ 622 bzero(&pfx_ro, sizeof(pfx_ro)); 623 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 624 pfx_addr->sin_len = sizeof(*pfx_addr); 625 pfx_addr->sin_family = AF_INET; 626 pfx_addr->sin_addr = *prefix; 627 rtalloc_ign_fib(&pfx_ro, 0, 0); 628 if (pfx_ro.ro_rt != NULL) { 629 msg_rt = *pfx_ro.ro_rt; 630 631 /* QL: XXX 632 * Point the gateway to the new interface 633 * address as if a new prefix route entry has 634 * been added through the new address alias. 635 * All other parts of the rtentry is accurate, 636 * e.g., rt_key, rt_mask, rt_ifp etc. 637 */ 638 msg_rt.rt_gateway = (struct sockaddr *)&target->ia_addr; 639 rt_newaddrmsg(cmd, (struct ifaddr *)target, 0, &msg_rt); 640 RTFREE(pfx_ro.ro_rt); 641 } 642 return; 643 } 644 645 /* 646 * Check if we have a route for the given prefix already or add one accordingly. 647 */ 648 int 649 in_addprefix(struct in_ifaddr *target, int flags) 650 { 651 struct in_ifaddr *ia; 652 struct in_addr prefix, mask, p, m; 653 int error; 654 655 if ((flags & RTF_HOST) != 0) { 656 prefix = target->ia_dstaddr.sin_addr; 657 mask.s_addr = 0; 658 } else { 659 prefix = target->ia_addr.sin_addr; 660 mask = target->ia_sockmask.sin_addr; 661 prefix.s_addr &= mask.s_addr; 662 } 663 664 IN_IFADDR_RLOCK(); 665 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 666 if (rtinitflags(ia)) { 667 p = ia->ia_dstaddr.sin_addr; 668 669 if (prefix.s_addr != p.s_addr) 670 continue; 671 } else { 672 p = ia->ia_addr.sin_addr; 673 m = ia->ia_sockmask.sin_addr; 674 p.s_addr &= m.s_addr; 675 676 if (prefix.s_addr != p.s_addr || 677 mask.s_addr != m.s_addr) 678 continue; 679 } 680 681 /* 682 * If we got a matching prefix route inserted by other 683 * interface address, we are done here. 684 */ 685 if (ia->ia_flags & IFA_ROUTE) { 686 #ifdef RADIX_MPATH 687 if (ia->ia_addr.sin_addr.s_addr == 688 target->ia_addr.sin_addr.s_addr) { 689 IN_IFADDR_RUNLOCK(); 690 return (EEXIST); 691 } else 692 break; 693 #endif 694 if (V_nosameprefix) { 695 IN_IFADDR_RUNLOCK(); 696 return (EEXIST); 697 } else { 698 in_addralias_rtmsg(RTM_ADD, &prefix, target); 699 IN_IFADDR_RUNLOCK(); 700 return (0); 701 } 702 } 703 } 704 IN_IFADDR_RUNLOCK(); 705 706 /* 707 * No-one seem to have this prefix route, so we try to insert it. 708 */ 709 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 710 if (!error) 711 target->ia_flags |= IFA_ROUTE; 712 return (error); 713 } 714 715 /* 716 * If there is no other address in the system that can serve a route to the 717 * same prefix, remove the route. Hand over the route to the new address 718 * otherwise. 719 */ 720 int 721 in_scrubprefix(struct in_ifaddr *target, u_int flags) 722 { 723 struct in_ifaddr *ia; 724 struct in_addr prefix, mask, p, m; 725 int error = 0; 726 struct sockaddr_in prefix0, mask0; 727 728 /* 729 * Remove the loopback route to the interface address. 730 */ 731 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 732 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 733 (flags & LLE_STATIC)) { 734 struct in_ifaddr *eia; 735 736 eia = in_localip_more(target); 737 738 if (eia != NULL) { 739 error = ifa_switch_loopback_route((struct ifaddr *)eia, 740 (struct sockaddr *)&target->ia_addr); 741 ifa_free(&eia->ia_ifa); 742 } else { 743 error = ifa_del_loopback_route((struct ifaddr *)target, 744 (struct sockaddr *)&target->ia_addr); 745 } 746 747 if (!(target->ia_ifp->if_flags & IFF_NOARP)) 748 /* remove arp cache */ 749 arp_ifscrub(target->ia_ifp, 750 IA_SIN(target)->sin_addr.s_addr); 751 } 752 753 if (rtinitflags(target)) { 754 prefix = target->ia_dstaddr.sin_addr; 755 mask.s_addr = 0; 756 } else { 757 prefix = target->ia_addr.sin_addr; 758 mask = target->ia_sockmask.sin_addr; 759 prefix.s_addr &= mask.s_addr; 760 } 761 762 if ((target->ia_flags & IFA_ROUTE) == 0) { 763 in_addralias_rtmsg(RTM_DELETE, &prefix, target); 764 return (0); 765 } 766 767 IN_IFADDR_RLOCK(); 768 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 769 if (rtinitflags(ia)) { 770 p = ia->ia_dstaddr.sin_addr; 771 772 if (prefix.s_addr != p.s_addr) 773 continue; 774 } else { 775 p = ia->ia_addr.sin_addr; 776 m = ia->ia_sockmask.sin_addr; 777 p.s_addr &= m.s_addr; 778 779 if (prefix.s_addr != p.s_addr || 780 mask.s_addr != m.s_addr) 781 continue; 782 } 783 784 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 785 continue; 786 787 /* 788 * If we got a matching prefix address, move IFA_ROUTE and 789 * the route itself to it. Make sure that routing daemons 790 * get a heads-up. 791 */ 792 if ((ia->ia_flags & IFA_ROUTE) == 0) { 793 ifa_ref(&ia->ia_ifa); 794 IN_IFADDR_RUNLOCK(); 795 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 796 rtinitflags(target)); 797 if (error == 0) 798 target->ia_flags &= ~IFA_ROUTE; 799 else 800 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 801 error); 802 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 803 rtinitflags(ia) | RTF_UP); 804 if (error == 0) 805 ia->ia_flags |= IFA_ROUTE; 806 else 807 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 808 error); 809 ifa_free(&ia->ia_ifa); 810 return (error); 811 } 812 } 813 IN_IFADDR_RUNLOCK(); 814 815 /* 816 * remove all L2 entries on the given prefix 817 */ 818 bzero(&prefix0, sizeof(prefix0)); 819 prefix0.sin_len = sizeof(prefix0); 820 prefix0.sin_family = AF_INET; 821 prefix0.sin_addr.s_addr = target->ia_subnet; 822 bzero(&mask0, sizeof(mask0)); 823 mask0.sin_len = sizeof(mask0); 824 mask0.sin_family = AF_INET; 825 mask0.sin_addr.s_addr = target->ia_subnetmask; 826 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 827 (struct sockaddr *)&mask0, flags); 828 829 /* 830 * As no-one seem to have this prefix, we can remove the route. 831 */ 832 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 833 if (error == 0) 834 target->ia_flags &= ~IFA_ROUTE; 835 else 836 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 837 return (error); 838 } 839 840 #undef rtinitflags 841 842 /* 843 * Return 1 if the address might be a local broadcast address. 844 */ 845 int 846 in_broadcast(struct in_addr in, struct ifnet *ifp) 847 { 848 register struct ifaddr *ifa; 849 u_long t; 850 851 if (in.s_addr == INADDR_BROADCAST || 852 in.s_addr == INADDR_ANY) 853 return (1); 854 if ((ifp->if_flags & IFF_BROADCAST) == 0) 855 return (0); 856 t = ntohl(in.s_addr); 857 /* 858 * Look through the list of addresses for a match 859 * with a broadcast address. 860 */ 861 #define ia ((struct in_ifaddr *)ifa) 862 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 863 if (ifa->ifa_addr->sa_family == AF_INET && 864 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 865 /* 866 * Check for old-style (host 0) broadcast, but 867 * taking into account that RFC 3021 obsoletes it. 868 */ 869 (ia->ia_subnetmask != IN_RFC3021_MASK && 870 t == ia->ia_subnet)) && 871 /* 872 * Check for an all one subnetmask. These 873 * only exist when an interface gets a secondary 874 * address. 875 */ 876 ia->ia_subnetmask != (u_long)0xffffffff) 877 return (1); 878 return (0); 879 #undef ia 880 } 881 882 /* 883 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 884 */ 885 void 886 in_ifdetach(struct ifnet *ifp) 887 { 888 889 in_pcbpurgeif0(&V_ripcbinfo, ifp); 890 in_pcbpurgeif0(&V_udbinfo, ifp); 891 in_purgemaddrs(ifp); 892 } 893 894 /* 895 * Delete all IPv4 multicast address records, and associated link-layer 896 * multicast address records, associated with ifp. 897 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 898 * XXX This should not race with ifma_protospec being set during 899 * a new allocation, if it does, we have bigger problems. 900 */ 901 static void 902 in_purgemaddrs(struct ifnet *ifp) 903 { 904 LIST_HEAD(,in_multi) purgeinms; 905 struct in_multi *inm, *tinm; 906 struct ifmultiaddr *ifma; 907 908 LIST_INIT(&purgeinms); 909 IN_MULTI_LOCK(); 910 911 /* 912 * Extract list of in_multi associated with the detaching ifp 913 * which the PF_INET layer is about to release. 914 * We need to do this as IF_ADDR_LOCK() may be re-acquired 915 * by code further down. 916 */ 917 IF_ADDR_RLOCK(ifp); 918 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 919 if (ifma->ifma_addr->sa_family != AF_INET || 920 ifma->ifma_protospec == NULL) 921 continue; 922 #if 0 923 KASSERT(ifma->ifma_protospec != NULL, 924 ("%s: ifma_protospec is NULL", __func__)); 925 #endif 926 inm = (struct in_multi *)ifma->ifma_protospec; 927 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 928 } 929 IF_ADDR_RUNLOCK(ifp); 930 931 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 932 LIST_REMOVE(inm, inm_link); 933 inm_release_locked(inm); 934 } 935 igmp_ifdetach(ifp); 936 937 IN_MULTI_UNLOCK(); 938 } 939 940 struct in_llentry { 941 struct llentry base; 942 struct sockaddr_in l3_addr4; 943 }; 944 945 /* 946 * Deletes an address from the address table. 947 * This function is called by the timer functions 948 * such as arptimer() and nd6_llinfo_timer(), and 949 * the caller does the locking. 950 */ 951 static void 952 in_lltable_free(struct lltable *llt, struct llentry *lle) 953 { 954 LLE_WUNLOCK(lle); 955 LLE_LOCK_DESTROY(lle); 956 free(lle, M_LLTABLE); 957 } 958 959 static struct llentry * 960 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 961 { 962 struct in_llentry *lle; 963 964 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 965 if (lle == NULL) /* NB: caller generates msg */ 966 return NULL; 967 968 /* 969 * For IPv4 this will trigger "arpresolve" to generate 970 * an ARP request. 971 */ 972 lle->base.la_expire = time_uptime; /* mark expired */ 973 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 974 lle->base.lle_refcnt = 1; 975 lle->base.lle_free = in_lltable_free; 976 LLE_LOCK_INIT(&lle->base); 977 callout_init_rw(&lle->base.la_timer, &lle->base.lle_lock, 978 CALLOUT_RETURNUNLOCKED); 979 980 return (&lle->base); 981 } 982 983 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 984 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 985 986 static void 987 in_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 988 const struct sockaddr *mask, u_int flags) 989 { 990 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 991 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 992 struct llentry *lle, *next; 993 int i; 994 size_t pkts_dropped; 995 996 IF_AFDATA_WLOCK(llt->llt_ifp); 997 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 998 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 999 /* 1000 * (flags & LLE_STATIC) means deleting all entries 1001 * including static ARP entries. 1002 */ 1003 if (IN_ARE_MASKED_ADDR_EQUAL(satosin(L3_ADDR(lle)), 1004 pfx, msk) && ((flags & LLE_STATIC) || 1005 !(lle->la_flags & LLE_STATIC))) { 1006 LLE_WLOCK(lle); 1007 if (callout_stop(&lle->la_timer)) 1008 LLE_REMREF(lle); 1009 pkts_dropped = llentry_free(lle); 1010 ARPSTAT_ADD(dropped, pkts_dropped); 1011 } 1012 } 1013 } 1014 IF_AFDATA_WUNLOCK(llt->llt_ifp); 1015 } 1016 1017 1018 static int 1019 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1020 { 1021 struct rtentry *rt; 1022 1023 KASSERT(l3addr->sa_family == AF_INET, 1024 ("sin_family %d", l3addr->sa_family)); 1025 1026 /* XXX rtalloc1 should take a const param */ 1027 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1028 1029 if (rt == NULL) 1030 return (EINVAL); 1031 1032 /* 1033 * If the gateway for an existing host route matches the target L3 1034 * address, which is a special route inserted by some implementation 1035 * such as MANET, and the interface is of the correct type, then 1036 * allow for ARP to proceed. 1037 */ 1038 if (rt->rt_flags & RTF_GATEWAY) { 1039 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1040 rt->rt_ifp->if_type != IFT_ETHER || 1041 (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1042 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1043 sizeof(in_addr_t)) != 0) { 1044 RTFREE_LOCKED(rt); 1045 return (EINVAL); 1046 } 1047 } 1048 1049 /* 1050 * Make sure that at least the destination address is covered 1051 * by the route. This is for handling the case where 2 or more 1052 * interfaces have the same prefix. An incoming packet arrives 1053 * on one interface and the corresponding outgoing packet leaves 1054 * another interface. 1055 */ 1056 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1057 const char *sa, *mask, *addr, *lim; 1058 int len; 1059 1060 mask = (const char *)rt_mask(rt); 1061 /* 1062 * Just being extra cautious to avoid some custom 1063 * code getting into trouble. 1064 */ 1065 if (mask == NULL) { 1066 RTFREE_LOCKED(rt); 1067 return (EINVAL); 1068 } 1069 1070 sa = (const char *)rt_key(rt); 1071 addr = (const char *)l3addr; 1072 len = ((const struct sockaddr_in *)l3addr)->sin_len; 1073 lim = addr + len; 1074 1075 for ( ; addr < lim; sa++, mask++, addr++) { 1076 if ((*sa ^ *addr) & *mask) { 1077 #ifdef DIAGNOSTIC 1078 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1079 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1080 #endif 1081 RTFREE_LOCKED(rt); 1082 return (EINVAL); 1083 } 1084 } 1085 } 1086 1087 RTFREE_LOCKED(rt); 1088 return (0); 1089 } 1090 1091 /* 1092 * Return NULL if not found or marked for deletion. 1093 * If found return lle read locked. 1094 */ 1095 static struct llentry * 1096 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1097 { 1098 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1099 struct ifnet *ifp = llt->llt_ifp; 1100 struct llentry *lle; 1101 struct llentries *lleh; 1102 u_int hashkey; 1103 1104 IF_AFDATA_LOCK_ASSERT(ifp); 1105 KASSERT(l3addr->sa_family == AF_INET, 1106 ("sin_family %d", l3addr->sa_family)); 1107 1108 hashkey = sin->sin_addr.s_addr; 1109 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1110 LIST_FOREACH(lle, lleh, lle_next) { 1111 struct sockaddr_in *sa2 = satosin(L3_ADDR(lle)); 1112 if (lle->la_flags & LLE_DELETED) 1113 continue; 1114 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1115 break; 1116 } 1117 if (lle == NULL) { 1118 #ifdef DIAGNOSTIC 1119 if (flags & LLE_DELETE) 1120 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1121 #endif 1122 if (!(flags & LLE_CREATE)) 1123 return (NULL); 1124 /* 1125 * A route that covers the given address must have 1126 * been installed 1st because we are doing a resolution, 1127 * verify this. 1128 */ 1129 if (!(flags & LLE_IFADDR) && 1130 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1131 goto done; 1132 1133 lle = in_lltable_new(l3addr, flags); 1134 if (lle == NULL) { 1135 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1136 goto done; 1137 } 1138 lle->la_flags = flags & ~LLE_CREATE; 1139 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1140 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1141 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1142 } 1143 1144 lle->lle_tbl = llt; 1145 lle->lle_head = lleh; 1146 lle->la_flags |= LLE_LINKED; 1147 LIST_INSERT_HEAD(lleh, lle, lle_next); 1148 } else if (flags & LLE_DELETE) { 1149 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1150 LLE_WLOCK(lle); 1151 lle->la_flags |= LLE_DELETED; 1152 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1153 #ifdef DIAGNOSTIC 1154 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1155 #endif 1156 if ((lle->la_flags & 1157 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 1158 llentry_free(lle); 1159 else 1160 LLE_WUNLOCK(lle); 1161 } 1162 lle = (void *)-1; 1163 1164 } 1165 if (LLE_IS_VALID(lle)) { 1166 if (flags & LLE_EXCLUSIVE) 1167 LLE_WLOCK(lle); 1168 else 1169 LLE_RLOCK(lle); 1170 } 1171 done: 1172 return (lle); 1173 } 1174 1175 static int 1176 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1177 { 1178 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1179 struct ifnet *ifp = llt->llt_ifp; 1180 struct llentry *lle; 1181 /* XXX stack use */ 1182 struct { 1183 struct rt_msghdr rtm; 1184 struct sockaddr_in sin; 1185 struct sockaddr_dl sdl; 1186 } arpc; 1187 int error, i; 1188 1189 LLTABLE_LOCK_ASSERT(); 1190 1191 error = 0; 1192 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1193 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1194 struct sockaddr_dl *sdl; 1195 1196 /* skip deleted entries */ 1197 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1198 continue; 1199 /* Skip if jailed and not a valid IP of the prison. */ 1200 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1201 continue; 1202 /* 1203 * produce a msg made of: 1204 * struct rt_msghdr; 1205 * struct sockaddr_in; (IPv4) 1206 * struct sockaddr_dl; 1207 */ 1208 bzero(&arpc, sizeof(arpc)); 1209 arpc.rtm.rtm_msglen = sizeof(arpc); 1210 arpc.rtm.rtm_version = RTM_VERSION; 1211 arpc.rtm.rtm_type = RTM_GET; 1212 arpc.rtm.rtm_flags = RTF_UP; 1213 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1214 arpc.sin.sin_family = AF_INET; 1215 arpc.sin.sin_len = sizeof(arpc.sin); 1216 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1217 1218 /* publish */ 1219 if (lle->la_flags & LLE_PUB) 1220 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1221 1222 sdl = &arpc.sdl; 1223 sdl->sdl_family = AF_LINK; 1224 sdl->sdl_len = sizeof(*sdl); 1225 sdl->sdl_index = ifp->if_index; 1226 sdl->sdl_type = ifp->if_type; 1227 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1228 sdl->sdl_alen = ifp->if_addrlen; 1229 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1230 } else { 1231 sdl->sdl_alen = 0; 1232 bzero(LLADDR(sdl), ifp->if_addrlen); 1233 } 1234 1235 arpc.rtm.rtm_rmx.rmx_expire = 1236 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1237 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1238 if (lle->la_flags & LLE_STATIC) 1239 arpc.rtm.rtm_flags |= RTF_STATIC; 1240 arpc.rtm.rtm_index = ifp->if_index; 1241 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1242 if (error) 1243 break; 1244 } 1245 } 1246 return error; 1247 #undef SIN 1248 } 1249 1250 void * 1251 in_domifattach(struct ifnet *ifp) 1252 { 1253 struct in_ifinfo *ii; 1254 struct lltable *llt; 1255 1256 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1257 1258 llt = lltable_init(ifp, AF_INET); 1259 if (llt != NULL) { 1260 llt->llt_prefix_free = in_lltable_prefix_free; 1261 llt->llt_lookup = in_lltable_lookup; 1262 llt->llt_dump = in_lltable_dump; 1263 } 1264 ii->ii_llt = llt; 1265 1266 ii->ii_igmp = igmp_domifattach(ifp); 1267 1268 return ii; 1269 } 1270 1271 void 1272 in_domifdetach(struct ifnet *ifp, void *aux) 1273 { 1274 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1275 1276 igmp_domifdetach(ifp); 1277 lltable_free(ii->ii_llt); 1278 free(ii, M_IFADDR); 1279 } 1280