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_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | 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 1 if an internet address is configured on an interface. 132 */ 133 int 134 in_ifhasaddr(struct ifnet *ifp, struct in_addr in) 135 { 136 struct ifaddr *ifa; 137 struct in_ifaddr *ia; 138 139 IF_ADDR_RLOCK(ifp); 140 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 141 if (ifa->ifa_addr->sa_family != AF_INET) 142 continue; 143 ia = (struct in_ifaddr *)ifa; 144 if (ia->ia_addr.sin_addr.s_addr == in.s_addr) { 145 IF_ADDR_RUNLOCK(ifp); 146 return (1); 147 } 148 } 149 IF_ADDR_RUNLOCK(ifp); 150 151 return (0); 152 } 153 154 /* 155 * Return a reference to the interface address which is different to 156 * the supplied one but with same IP address value. 157 */ 158 static struct in_ifaddr * 159 in_localip_more(struct in_ifaddr *ia) 160 { 161 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr; 162 struct in_ifaddr *it; 163 164 IN_IFADDR_RLOCK(); 165 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) { 166 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) { 167 ifa_ref(&it->ia_ifa); 168 IN_IFADDR_RUNLOCK(); 169 return (it); 170 } 171 } 172 IN_IFADDR_RUNLOCK(); 173 174 return (NULL); 175 } 176 177 /* 178 * Determine whether an IP address is in a reserved set of addresses 179 * that may not be forwarded, or whether datagrams to that destination 180 * may be forwarded. 181 */ 182 int 183 in_canforward(struct in_addr in) 184 { 185 register u_long i = ntohl(in.s_addr); 186 register u_long net; 187 188 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 189 return (0); 190 if (IN_CLASSA(i)) { 191 net = i & IN_CLASSA_NET; 192 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 193 return (0); 194 } 195 return (1); 196 } 197 198 /* 199 * Trim a mask in a sockaddr 200 */ 201 static void 202 in_socktrim(struct sockaddr_in *ap) 203 { 204 register char *cplim = (char *) &ap->sin_addr; 205 register char *cp = (char *) (&ap->sin_addr + 1); 206 207 ap->sin_len = 0; 208 while (--cp >= cplim) 209 if (*cp) { 210 (ap)->sin_len = cp - (char *) (ap) + 1; 211 break; 212 } 213 } 214 215 /* 216 * Generic internet control operations (ioctl's). 217 */ 218 int 219 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 220 struct thread *td) 221 { 222 struct ifreq *ifr = (struct ifreq *)data; 223 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr; 224 struct ifaddr *ifa; 225 struct in_ifaddr *ia; 226 int error; 227 228 if (ifp == NULL) 229 return (EADDRNOTAVAIL); 230 231 /* 232 * Filter out 4 ioctls we implement directly. Forward the rest 233 * to specific functions and ifp->if_ioctl(). 234 */ 235 switch (cmd) { 236 case SIOCGIFADDR: 237 case SIOCGIFBRDADDR: 238 case SIOCGIFDSTADDR: 239 case SIOCGIFNETMASK: 240 break; 241 case SIOCDIFADDR: 242 sx_xlock(&in_control_sx); 243 error = in_difaddr_ioctl(data, ifp, td); 244 sx_xunlock(&in_control_sx); 245 return (error); 246 case OSIOCAIFADDR: /* 9.x compat */ 247 case SIOCAIFADDR: 248 sx_xlock(&in_control_sx); 249 error = in_aifaddr_ioctl(cmd, data, ifp, td); 250 sx_xunlock(&in_control_sx); 251 return (error); 252 case SIOCSIFADDR: 253 case SIOCSIFBRDADDR: 254 case SIOCSIFDSTADDR: 255 case SIOCSIFNETMASK: 256 /* We no longer support that old commands. */ 257 return (EINVAL); 258 default: 259 if (ifp->if_ioctl == NULL) 260 return (EOPNOTSUPP); 261 return ((*ifp->if_ioctl)(ifp, cmd, data)); 262 } 263 264 if (addr->sin_addr.s_addr != INADDR_ANY && 265 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0) 266 return (EADDRNOTAVAIL); 267 268 /* 269 * Find address for this interface, if it exists. If an 270 * address was specified, find that one instead of the 271 * first one on the interface, if possible. 272 */ 273 IF_ADDR_RLOCK(ifp); 274 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 275 if (ifa->ifa_addr->sa_family != AF_INET) 276 continue; 277 ia = (struct in_ifaddr *)ifa; 278 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr) 279 break; 280 } 281 if (ifa == NULL) 282 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 283 if (ifa->ifa_addr->sa_family == AF_INET) { 284 ia = (struct in_ifaddr *)ifa; 285 if (prison_check_ip4(td->td_ucred, 286 &ia->ia_addr.sin_addr) == 0) 287 break; 288 } 289 290 if (ifa == NULL) { 291 IF_ADDR_RUNLOCK(ifp); 292 return (EADDRNOTAVAIL); 293 } 294 295 error = 0; 296 switch (cmd) { 297 case SIOCGIFADDR: 298 *addr = ia->ia_addr; 299 break; 300 301 case SIOCGIFBRDADDR: 302 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 303 error = EINVAL; 304 break; 305 } 306 *addr = ia->ia_broadaddr; 307 break; 308 309 case SIOCGIFDSTADDR: 310 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 311 error = EINVAL; 312 break; 313 } 314 *addr = ia->ia_dstaddr; 315 break; 316 317 case SIOCGIFNETMASK: 318 *addr = ia->ia_sockmask; 319 break; 320 } 321 322 IF_ADDR_RUNLOCK(ifp); 323 324 return (error); 325 } 326 327 static int 328 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 329 { 330 const struct in_aliasreq *ifra = (struct in_aliasreq *)data; 331 const struct sockaddr_in *addr = &ifra->ifra_addr; 332 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr; 333 const struct sockaddr_in *mask = &ifra->ifra_mask; 334 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr; 335 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0; 336 struct ifaddr *ifa; 337 struct in_ifaddr *ia; 338 bool iaIsFirst; 339 int error = 0; 340 341 error = priv_check(td, PRIV_NET_ADDIFADDR); 342 if (error) 343 return (error); 344 345 /* 346 * ifra_addr must be present and be of INET family. 347 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional. 348 */ 349 if (addr->sin_len != sizeof(struct sockaddr_in) || 350 addr->sin_family != AF_INET) 351 return (EINVAL); 352 if (broadaddr->sin_len != 0 && 353 (broadaddr->sin_len != sizeof(struct sockaddr_in) || 354 broadaddr->sin_family != AF_INET)) 355 return (EINVAL); 356 if (mask->sin_len != 0 && 357 (mask->sin_len != sizeof(struct sockaddr_in) || 358 mask->sin_family != AF_INET)) 359 return (EINVAL); 360 if ((ifp->if_flags & IFF_POINTOPOINT) && 361 (dstaddr->sin_len != sizeof(struct sockaddr_in) || 362 dstaddr->sin_addr.s_addr == INADDR_ANY)) 363 return (EDESTADDRREQ); 364 if (vhid > 0 && carp_attach_p == NULL) 365 return (EPROTONOSUPPORT); 366 367 /* 368 * See whether address already exist. 369 */ 370 iaIsFirst = true; 371 ia = NULL; 372 IF_ADDR_RLOCK(ifp); 373 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 374 struct in_ifaddr *it; 375 376 if (ifa->ifa_addr->sa_family != AF_INET) 377 continue; 378 379 it = (struct in_ifaddr *)ifa; 380 iaIsFirst = false; 381 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 382 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) 383 ia = it; 384 } 385 IF_ADDR_RUNLOCK(ifp); 386 387 if (ia != NULL) 388 (void )in_difaddr_ioctl(data, ifp, td); 389 390 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK); 391 ia = (struct in_ifaddr *)ifa; 392 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 393 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 394 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 395 396 ia->ia_ifp = ifp; 397 ia->ia_addr = *addr; 398 if (mask->sin_len != 0) { 399 ia->ia_sockmask = *mask; 400 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 401 } else { 402 in_addr_t i = ntohl(addr->sin_addr.s_addr); 403 404 /* 405 * Be compatible with network classes, if netmask isn't 406 * supplied, guess it based on classes. 407 */ 408 if (IN_CLASSA(i)) 409 ia->ia_subnetmask = IN_CLASSA_NET; 410 else if (IN_CLASSB(i)) 411 ia->ia_subnetmask = IN_CLASSB_NET; 412 else 413 ia->ia_subnetmask = IN_CLASSC_NET; 414 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 415 } 416 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask; 417 in_socktrim(&ia->ia_sockmask); 418 419 if (ifp->if_flags & IFF_BROADCAST) { 420 if (broadaddr->sin_len != 0) { 421 ia->ia_broadaddr = *broadaddr; 422 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) { 423 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 424 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 425 ia->ia_broadaddr.sin_family = AF_INET; 426 } else { 427 ia->ia_broadaddr.sin_addr.s_addr = 428 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 429 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 430 ia->ia_broadaddr.sin_family = AF_INET; 431 } 432 } 433 434 if (ifp->if_flags & IFF_POINTOPOINT) 435 ia->ia_dstaddr = *dstaddr; 436 437 /* XXXGL: rtinit() needs this strange assignment. */ 438 if (ifp->if_flags & IFF_LOOPBACK) 439 ia->ia_dstaddr = ia->ia_addr; 440 441 if (vhid != 0) { 442 error = (*carp_attach_p)(&ia->ia_ifa, vhid); 443 if (error) 444 return (error); 445 } 446 447 /* if_addrhead is already referenced by ifa_alloc() */ 448 IF_ADDR_WLOCK(ifp); 449 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 450 IF_ADDR_WUNLOCK(ifp); 451 452 ifa_ref(ifa); /* in_ifaddrhead */ 453 IN_IFADDR_WLOCK(); 454 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 455 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 456 IN_IFADDR_WUNLOCK(); 457 458 /* 459 * Give the interface a chance to initialize 460 * if this is its first address, 461 * and to validate the address if necessary. 462 */ 463 if (ifp->if_ioctl != NULL) { 464 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 465 if (error) 466 goto fail1; 467 } 468 469 /* 470 * Add route for the network. 471 */ 472 if (vhid == 0) { 473 int flags = RTF_UP; 474 475 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 476 flags |= RTF_HOST; 477 478 error = in_addprefix(ia, flags); 479 if (error) 480 goto fail1; 481 } 482 483 /* 484 * Add a loopback route to self. 485 */ 486 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 && 487 ia->ia_addr.sin_addr.s_addr != INADDR_ANY && 488 !((ifp->if_flags & IFF_POINTOPOINT) && 489 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) { 490 struct in_ifaddr *eia; 491 492 eia = in_localip_more(ia); 493 494 if (eia == NULL) { 495 error = ifa_add_loopback_route((struct ifaddr *)ia, 496 (struct sockaddr *)&ia->ia_addr); 497 if (error) 498 goto fail2; 499 } else 500 ifa_free(&eia->ia_ifa); 501 } 502 503 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) { 504 struct in_addr allhosts_addr; 505 struct in_ifinfo *ii; 506 507 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 508 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 509 510 error = in_joingroup(ifp, &allhosts_addr, NULL, 511 &ii->ii_allhosts); 512 } 513 514 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 515 516 return (error); 517 518 fail2: 519 if (vhid == 0) 520 (void )in_scrubprefix(ia, LLE_STATIC); 521 522 fail1: 523 if (ia->ia_ifa.ifa_carp) 524 (*carp_detach_p)(&ia->ia_ifa); 525 526 IF_ADDR_WLOCK(ifp); 527 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 528 IF_ADDR_WUNLOCK(ifp); 529 ifa_free(&ia->ia_ifa); /* if_addrhead */ 530 531 IN_IFADDR_WLOCK(); 532 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 533 LIST_REMOVE(ia, ia_hash); 534 IN_IFADDR_WUNLOCK(); 535 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 536 537 return (error); 538 } 539 540 static int 541 in_difaddr_ioctl(caddr_t data, struct ifnet *ifp, struct thread *td) 542 { 543 const struct ifreq *ifr = (struct ifreq *)data; 544 const struct sockaddr_in *addr = (const struct sockaddr_in *) 545 &ifr->ifr_addr; 546 struct ifaddr *ifa; 547 struct in_ifaddr *ia; 548 bool deleteAny, iaIsLast; 549 int error; 550 551 if (td != NULL) { 552 error = priv_check(td, PRIV_NET_DELIFADDR); 553 if (error) 554 return (error); 555 } 556 557 if (addr->sin_len != sizeof(struct sockaddr_in) || 558 addr->sin_family != AF_INET) 559 deleteAny = true; 560 else 561 deleteAny = false; 562 563 iaIsLast = true; 564 ia = NULL; 565 IF_ADDR_WLOCK(ifp); 566 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 567 struct in_ifaddr *it; 568 569 if (ifa->ifa_addr->sa_family != AF_INET) 570 continue; 571 572 it = (struct in_ifaddr *)ifa; 573 if (deleteAny && ia == NULL && (td == NULL || 574 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0)) 575 ia = it; 576 577 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 578 (td == NULL || prison_check_ip4(td->td_ucred, 579 &addr->sin_addr) == 0)) 580 ia = it; 581 582 if (it != ia) 583 iaIsLast = false; 584 } 585 586 if (ia == NULL) { 587 IF_ADDR_WUNLOCK(ifp); 588 return (EADDRNOTAVAIL); 589 } 590 591 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 592 IF_ADDR_WUNLOCK(ifp); 593 ifa_free(&ia->ia_ifa); /* if_addrhead */ 594 595 IN_IFADDR_WLOCK(); 596 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 597 LIST_REMOVE(ia, ia_hash); 598 IN_IFADDR_WUNLOCK(); 599 600 /* 601 * in_scrubprefix() kills the interface route. 602 */ 603 in_scrubprefix(ia, LLE_STATIC); 604 605 /* 606 * in_ifadown gets rid of all the rest of 607 * the routes. This is not quite the right 608 * thing to do, but at least if we are running 609 * a routing process they will come back. 610 */ 611 in_ifadown(&ia->ia_ifa, 1); 612 613 if (ia->ia_ifa.ifa_carp) 614 (*carp_detach_p)(&ia->ia_ifa); 615 616 /* 617 * If this is the last IPv4 address configured on this 618 * interface, leave the all-hosts group. 619 * No state-change report need be transmitted. 620 */ 621 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) { 622 struct in_ifinfo *ii; 623 624 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 625 IN_MULTI_LOCK(); 626 if (ii->ii_allhosts) { 627 (void)in_leavegroup_locked(ii->ii_allhosts, NULL); 628 ii->ii_allhosts = NULL; 629 } 630 IN_MULTI_UNLOCK(); 631 } 632 633 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 634 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 635 636 return (0); 637 } 638 639 #define rtinitflags(x) \ 640 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 641 ? RTF_HOST : 0) 642 643 /* 644 * Check if we have a route for the given prefix already or add one accordingly. 645 */ 646 int 647 in_addprefix(struct in_ifaddr *target, int flags) 648 { 649 struct in_ifaddr *ia; 650 struct in_addr prefix, mask, p, m; 651 int error; 652 653 if ((flags & RTF_HOST) != 0) { 654 prefix = target->ia_dstaddr.sin_addr; 655 mask.s_addr = 0; 656 } else { 657 prefix = target->ia_addr.sin_addr; 658 mask = target->ia_sockmask.sin_addr; 659 prefix.s_addr &= mask.s_addr; 660 } 661 662 IN_IFADDR_RLOCK(); 663 /* Look for an existing address with the same prefix, mask, and fib */ 664 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 665 if (rtinitflags(ia)) { 666 p = ia->ia_dstaddr.sin_addr; 667 668 if (prefix.s_addr != p.s_addr) 669 continue; 670 } else { 671 p = ia->ia_addr.sin_addr; 672 m = ia->ia_sockmask.sin_addr; 673 p.s_addr &= m.s_addr; 674 675 if (prefix.s_addr != p.s_addr || 676 mask.s_addr != m.s_addr) 677 continue; 678 } 679 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib) 680 continue; 681 682 /* 683 * If we got a matching prefix route inserted by other 684 * interface address, we are done here. 685 */ 686 if (ia->ia_flags & IFA_ROUTE) { 687 #ifdef RADIX_MPATH 688 if (ia->ia_addr.sin_addr.s_addr == 689 target->ia_addr.sin_addr.s_addr) { 690 IN_IFADDR_RUNLOCK(); 691 return (EEXIST); 692 } else 693 break; 694 #endif 695 if (V_nosameprefix) { 696 IN_IFADDR_RUNLOCK(); 697 return (EEXIST); 698 } else { 699 int fibnum; 700 701 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : 702 target->ia_ifp->if_fib; 703 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum); 704 IN_IFADDR_RUNLOCK(); 705 return (0); 706 } 707 } 708 } 709 IN_IFADDR_RUNLOCK(); 710 711 /* 712 * No-one seem to have this prefix route, so we try to insert it. 713 */ 714 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 715 if (!error) 716 target->ia_flags |= IFA_ROUTE; 717 return (error); 718 } 719 720 /* 721 * If there is no other address in the system that can serve a route to the 722 * same prefix, remove the route. Hand over the route to the new address 723 * otherwise. 724 */ 725 int 726 in_scrubprefix(struct in_ifaddr *target, u_int flags) 727 { 728 struct in_ifaddr *ia; 729 struct in_addr prefix, mask, p, m; 730 int error = 0; 731 struct sockaddr_in prefix0, mask0; 732 733 /* 734 * Remove the loopback route to the interface address. 735 */ 736 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 737 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 738 (flags & LLE_STATIC)) { 739 struct in_ifaddr *eia; 740 741 eia = in_localip_more(target); 742 743 if (eia != NULL) { 744 int fibnum = target->ia_ifp->if_fib; 745 746 error = ifa_switch_loopback_route((struct ifaddr *)eia, 747 (struct sockaddr *)&target->ia_addr, fibnum); 748 ifa_free(&eia->ia_ifa); 749 } else { 750 error = ifa_del_loopback_route((struct ifaddr *)target, 751 (struct sockaddr *)&target->ia_addr); 752 } 753 754 if (!(target->ia_ifp->if_flags & IFF_NOARP)) 755 /* remove arp cache */ 756 arp_ifscrub(target->ia_ifp, 757 IA_SIN(target)->sin_addr.s_addr); 758 } 759 760 if (rtinitflags(target)) { 761 prefix = target->ia_dstaddr.sin_addr; 762 mask.s_addr = 0; 763 } else { 764 prefix = target->ia_addr.sin_addr; 765 mask = target->ia_sockmask.sin_addr; 766 prefix.s_addr &= mask.s_addr; 767 } 768 769 if ((target->ia_flags & IFA_ROUTE) == 0) { 770 int fibnum; 771 772 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : 773 target->ia_ifp->if_fib; 774 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum); 775 return (0); 776 } 777 778 IN_IFADDR_RLOCK(); 779 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 780 if (rtinitflags(ia)) { 781 p = ia->ia_dstaddr.sin_addr; 782 783 if (prefix.s_addr != p.s_addr) 784 continue; 785 } else { 786 p = ia->ia_addr.sin_addr; 787 m = ia->ia_sockmask.sin_addr; 788 p.s_addr &= m.s_addr; 789 790 if (prefix.s_addr != p.s_addr || 791 mask.s_addr != m.s_addr) 792 continue; 793 } 794 795 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 796 continue; 797 798 /* 799 * If we got a matching prefix address, move IFA_ROUTE and 800 * the route itself to it. Make sure that routing daemons 801 * get a heads-up. 802 */ 803 if ((ia->ia_flags & IFA_ROUTE) == 0) { 804 ifa_ref(&ia->ia_ifa); 805 IN_IFADDR_RUNLOCK(); 806 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 807 rtinitflags(target)); 808 if (error == 0) 809 target->ia_flags &= ~IFA_ROUTE; 810 else 811 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 812 error); 813 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 814 rtinitflags(ia) | RTF_UP); 815 if (error == 0) 816 ia->ia_flags |= IFA_ROUTE; 817 else 818 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 819 error); 820 ifa_free(&ia->ia_ifa); 821 return (error); 822 } 823 } 824 IN_IFADDR_RUNLOCK(); 825 826 /* 827 * remove all L2 entries on the given prefix 828 */ 829 bzero(&prefix0, sizeof(prefix0)); 830 prefix0.sin_len = sizeof(prefix0); 831 prefix0.sin_family = AF_INET; 832 prefix0.sin_addr.s_addr = target->ia_subnet; 833 bzero(&mask0, sizeof(mask0)); 834 mask0.sin_len = sizeof(mask0); 835 mask0.sin_family = AF_INET; 836 mask0.sin_addr.s_addr = target->ia_subnetmask; 837 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 838 (struct sockaddr *)&mask0, flags); 839 840 /* 841 * As no-one seem to have this prefix, we can remove the route. 842 */ 843 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 844 if (error == 0) 845 target->ia_flags &= ~IFA_ROUTE; 846 else 847 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 848 return (error); 849 } 850 851 #undef rtinitflags 852 853 /* 854 * Return 1 if the address might be a local broadcast address. 855 */ 856 int 857 in_broadcast(struct in_addr in, struct ifnet *ifp) 858 { 859 register struct ifaddr *ifa; 860 u_long t; 861 862 if (in.s_addr == INADDR_BROADCAST || 863 in.s_addr == INADDR_ANY) 864 return (1); 865 if ((ifp->if_flags & IFF_BROADCAST) == 0) 866 return (0); 867 t = ntohl(in.s_addr); 868 /* 869 * Look through the list of addresses for a match 870 * with a broadcast address. 871 */ 872 #define ia ((struct in_ifaddr *)ifa) 873 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 874 if (ifa->ifa_addr->sa_family == AF_INET && 875 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 876 /* 877 * Check for old-style (host 0) broadcast, but 878 * taking into account that RFC 3021 obsoletes it. 879 */ 880 (ia->ia_subnetmask != IN_RFC3021_MASK && 881 t == ia->ia_subnet)) && 882 /* 883 * Check for an all one subnetmask. These 884 * only exist when an interface gets a secondary 885 * address. 886 */ 887 ia->ia_subnetmask != (u_long)0xffffffff) 888 return (1); 889 return (0); 890 #undef ia 891 } 892 893 /* 894 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 895 */ 896 void 897 in_ifdetach(struct ifnet *ifp) 898 { 899 900 in_pcbpurgeif0(&V_ripcbinfo, ifp); 901 in_pcbpurgeif0(&V_udbinfo, ifp); 902 in_pcbpurgeif0(&V_ulitecbinfo, ifp); 903 in_purgemaddrs(ifp); 904 } 905 906 /* 907 * Delete all IPv4 multicast address records, and associated link-layer 908 * multicast address records, associated with ifp. 909 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 910 * XXX This should not race with ifma_protospec being set during 911 * a new allocation, if it does, we have bigger problems. 912 */ 913 static void 914 in_purgemaddrs(struct ifnet *ifp) 915 { 916 LIST_HEAD(,in_multi) purgeinms; 917 struct in_multi *inm, *tinm; 918 struct ifmultiaddr *ifma; 919 920 LIST_INIT(&purgeinms); 921 IN_MULTI_LOCK(); 922 923 /* 924 * Extract list of in_multi associated with the detaching ifp 925 * which the PF_INET layer is about to release. 926 * We need to do this as IF_ADDR_LOCK() may be re-acquired 927 * by code further down. 928 */ 929 IF_ADDR_RLOCK(ifp); 930 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 931 if (ifma->ifma_addr->sa_family != AF_INET || 932 ifma->ifma_protospec == NULL) 933 continue; 934 #if 0 935 KASSERT(ifma->ifma_protospec != NULL, 936 ("%s: ifma_protospec is NULL", __func__)); 937 #endif 938 inm = (struct in_multi *)ifma->ifma_protospec; 939 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 940 } 941 IF_ADDR_RUNLOCK(ifp); 942 943 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 944 LIST_REMOVE(inm, inm_link); 945 inm_release_locked(inm); 946 } 947 igmp_ifdetach(ifp); 948 949 IN_MULTI_UNLOCK(); 950 } 951 952 struct in_llentry { 953 struct llentry base; 954 struct sockaddr_in l3_addr4; 955 }; 956 957 /* 958 * Deletes an address from the address table. 959 * This function is called by the timer functions 960 * such as arptimer() and nd6_llinfo_timer(), and 961 * the caller does the locking. 962 */ 963 static void 964 in_lltable_free(struct lltable *llt, struct llentry *lle) 965 { 966 LLE_WUNLOCK(lle); 967 LLE_LOCK_DESTROY(lle); 968 free(lle, M_LLTABLE); 969 } 970 971 static struct llentry * 972 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 973 { 974 struct in_llentry *lle; 975 976 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 977 if (lle == NULL) /* NB: caller generates msg */ 978 return NULL; 979 980 /* 981 * For IPv4 this will trigger "arpresolve" to generate 982 * an ARP request. 983 */ 984 lle->base.la_expire = time_uptime; /* mark expired */ 985 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 986 lle->base.lle_refcnt = 1; 987 lle->base.lle_free = in_lltable_free; 988 LLE_LOCK_INIT(&lle->base); 989 callout_init(&lle->base.la_timer, 1); 990 991 return (&lle->base); 992 } 993 994 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 995 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 996 997 static void 998 in_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 999 const struct sockaddr *mask, u_int flags) 1000 { 1001 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1002 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1003 struct llentry *lle, *next; 1004 int i; 1005 size_t pkts_dropped; 1006 1007 IF_AFDATA_WLOCK(llt->llt_ifp); 1008 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1009 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1010 /* 1011 * (flags & LLE_STATIC) means deleting all entries 1012 * including static ARP entries. 1013 */ 1014 if (IN_ARE_MASKED_ADDR_EQUAL(satosin(L3_ADDR(lle)), 1015 pfx, msk) && ((flags & LLE_STATIC) || 1016 !(lle->la_flags & LLE_STATIC))) { 1017 LLE_WLOCK(lle); 1018 if (callout_stop(&lle->la_timer)) 1019 LLE_REMREF(lle); 1020 pkts_dropped = llentry_free(lle); 1021 ARPSTAT_ADD(dropped, pkts_dropped); 1022 } 1023 } 1024 } 1025 IF_AFDATA_WUNLOCK(llt->llt_ifp); 1026 } 1027 1028 1029 static int 1030 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1031 { 1032 struct rtentry *rt; 1033 1034 KASSERT(l3addr->sa_family == AF_INET, 1035 ("sin_family %d", l3addr->sa_family)); 1036 1037 /* XXX rtalloc1_fib should take a const param */ 1038 rt = rtalloc1_fib(__DECONST(struct sockaddr *, l3addr), 0, 0, 1039 ifp->if_fib); 1040 1041 if (rt == NULL) 1042 return (EINVAL); 1043 1044 /* 1045 * If the gateway for an existing host route matches the target L3 1046 * address, which is a special route inserted by some implementation 1047 * such as MANET, and the interface is of the correct type, then 1048 * allow for ARP to proceed. 1049 */ 1050 if (rt->rt_flags & RTF_GATEWAY) { 1051 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1052 rt->rt_ifp->if_type != IFT_ETHER || 1053 (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1054 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1055 sizeof(in_addr_t)) != 0) { 1056 RTFREE_LOCKED(rt); 1057 return (EINVAL); 1058 } 1059 } 1060 1061 /* 1062 * Make sure that at least the destination address is covered 1063 * by the route. This is for handling the case where 2 or more 1064 * interfaces have the same prefix. An incoming packet arrives 1065 * on one interface and the corresponding outgoing packet leaves 1066 * another interface. 1067 */ 1068 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1069 const char *sa, *mask, *addr, *lim; 1070 int len; 1071 1072 mask = (const char *)rt_mask(rt); 1073 /* 1074 * Just being extra cautious to avoid some custom 1075 * code getting into trouble. 1076 */ 1077 if (mask == NULL) { 1078 RTFREE_LOCKED(rt); 1079 return (EINVAL); 1080 } 1081 1082 sa = (const char *)rt_key(rt); 1083 addr = (const char *)l3addr; 1084 len = ((const struct sockaddr_in *)l3addr)->sin_len; 1085 lim = addr + len; 1086 1087 for ( ; addr < lim; sa++, mask++, addr++) { 1088 if ((*sa ^ *addr) & *mask) { 1089 #ifdef DIAGNOSTIC 1090 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1091 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1092 #endif 1093 RTFREE_LOCKED(rt); 1094 return (EINVAL); 1095 } 1096 } 1097 } 1098 1099 RTFREE_LOCKED(rt); 1100 return (0); 1101 } 1102 1103 /* 1104 * Return NULL if not found or marked for deletion. 1105 * If found return lle read locked. 1106 */ 1107 static struct llentry * 1108 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1109 { 1110 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1111 struct ifnet *ifp = llt->llt_ifp; 1112 struct llentry *lle; 1113 struct llentries *lleh; 1114 u_int hashkey; 1115 1116 IF_AFDATA_LOCK_ASSERT(ifp); 1117 KASSERT(l3addr->sa_family == AF_INET, 1118 ("sin_family %d", l3addr->sa_family)); 1119 1120 hashkey = sin->sin_addr.s_addr; 1121 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1122 LIST_FOREACH(lle, lleh, lle_next) { 1123 struct sockaddr_in *sa2 = satosin(L3_ADDR(lle)); 1124 if (lle->la_flags & LLE_DELETED) 1125 continue; 1126 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1127 break; 1128 } 1129 if (lle == NULL) { 1130 #ifdef DIAGNOSTIC 1131 if (flags & LLE_DELETE) 1132 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1133 #endif 1134 if (!(flags & LLE_CREATE)) 1135 return (NULL); 1136 IF_AFDATA_WLOCK_ASSERT(ifp); 1137 /* 1138 * A route that covers the given address must have 1139 * been installed 1st because we are doing a resolution, 1140 * verify this. 1141 */ 1142 if (!(flags & LLE_IFADDR) && 1143 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1144 goto done; 1145 1146 lle = in_lltable_new(l3addr, flags); 1147 if (lle == NULL) { 1148 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1149 goto done; 1150 } 1151 lle->la_flags = flags & ~LLE_CREATE; 1152 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1153 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1154 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1155 } 1156 1157 lle->lle_tbl = llt; 1158 lle->lle_head = lleh; 1159 lle->la_flags |= LLE_LINKED; 1160 LIST_INSERT_HEAD(lleh, lle, lle_next); 1161 } else if (flags & LLE_DELETE) { 1162 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1163 LLE_WLOCK(lle); 1164 lle->la_flags |= LLE_DELETED; 1165 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1166 #ifdef DIAGNOSTIC 1167 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1168 #endif 1169 if ((lle->la_flags & 1170 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 1171 llentry_free(lle); 1172 else 1173 LLE_WUNLOCK(lle); 1174 } 1175 lle = (void *)-1; 1176 1177 } 1178 if (LLE_IS_VALID(lle)) { 1179 if (flags & LLE_EXCLUSIVE) 1180 LLE_WLOCK(lle); 1181 else 1182 LLE_RLOCK(lle); 1183 } 1184 done: 1185 return (lle); 1186 } 1187 1188 static int 1189 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1190 { 1191 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1192 struct ifnet *ifp = llt->llt_ifp; 1193 struct llentry *lle; 1194 /* XXX stack use */ 1195 struct { 1196 struct rt_msghdr rtm; 1197 struct sockaddr_in sin; 1198 struct sockaddr_dl sdl; 1199 } arpc; 1200 int error, i; 1201 1202 LLTABLE_LOCK_ASSERT(); 1203 1204 error = 0; 1205 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1206 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1207 struct sockaddr_dl *sdl; 1208 1209 /* skip deleted entries */ 1210 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1211 continue; 1212 /* Skip if jailed and not a valid IP of the prison. */ 1213 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1214 continue; 1215 /* 1216 * produce a msg made of: 1217 * struct rt_msghdr; 1218 * struct sockaddr_in; (IPv4) 1219 * struct sockaddr_dl; 1220 */ 1221 bzero(&arpc, sizeof(arpc)); 1222 arpc.rtm.rtm_msglen = sizeof(arpc); 1223 arpc.rtm.rtm_version = RTM_VERSION; 1224 arpc.rtm.rtm_type = RTM_GET; 1225 arpc.rtm.rtm_flags = RTF_UP; 1226 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1227 arpc.sin.sin_family = AF_INET; 1228 arpc.sin.sin_len = sizeof(arpc.sin); 1229 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1230 1231 /* publish */ 1232 if (lle->la_flags & LLE_PUB) 1233 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1234 1235 sdl = &arpc.sdl; 1236 sdl->sdl_family = AF_LINK; 1237 sdl->sdl_len = sizeof(*sdl); 1238 sdl->sdl_index = ifp->if_index; 1239 sdl->sdl_type = ifp->if_type; 1240 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1241 sdl->sdl_alen = ifp->if_addrlen; 1242 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1243 } else { 1244 sdl->sdl_alen = 0; 1245 bzero(LLADDR(sdl), ifp->if_addrlen); 1246 } 1247 1248 arpc.rtm.rtm_rmx.rmx_expire = 1249 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1250 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1251 if (lle->la_flags & LLE_STATIC) 1252 arpc.rtm.rtm_flags |= RTF_STATIC; 1253 arpc.rtm.rtm_index = ifp->if_index; 1254 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1255 if (error) 1256 break; 1257 } 1258 } 1259 return error; 1260 #undef SIN 1261 } 1262 1263 void * 1264 in_domifattach(struct ifnet *ifp) 1265 { 1266 struct in_ifinfo *ii; 1267 struct lltable *llt; 1268 1269 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1270 1271 llt = lltable_init(ifp, AF_INET); 1272 if (llt != NULL) { 1273 llt->llt_prefix_free = in_lltable_prefix_free; 1274 llt->llt_lookup = in_lltable_lookup; 1275 llt->llt_dump = in_lltable_dump; 1276 } 1277 ii->ii_llt = llt; 1278 1279 ii->ii_igmp = igmp_domifattach(ifp); 1280 1281 return ii; 1282 } 1283 1284 void 1285 in_domifdetach(struct ifnet *ifp, void *aux) 1286 { 1287 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1288 1289 igmp_domifdetach(ifp); 1290 lltable_free(ii->ii_llt); 1291 free(ii, M_IFADDR); 1292 } 1293