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/kernel.h> 45 #include <sys/sysctl.h> 46 47 #include <net/if.h> 48 #include <net/if_types.h> 49 #include <net/route.h> 50 51 #include <netinet/in.h> 52 #include <netinet/in_var.h> 53 #include <netinet/in_pcb.h> 54 #include <netinet/ip_var.h> 55 56 static int in_mask2len(struct in_addr *); 57 static void in_len2mask(struct in_addr *, int); 58 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 59 struct ifnet *, struct thread *); 60 61 static int in_addprefix(struct in_ifaddr *, int); 62 static int in_scrubprefix(struct in_ifaddr *); 63 static void in_socktrim(struct sockaddr_in *); 64 static int in_ifinit(struct ifnet *, 65 struct in_ifaddr *, struct sockaddr_in *, int); 66 static void in_purgemaddrs(struct ifnet *); 67 68 static int subnetsarelocal = 0; 69 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 70 &subnetsarelocal, 0, "Treat all subnets as directly connected"); 71 static int sameprefixcarponly = 0; 72 SYSCTL_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 73 &sameprefixcarponly, 0, 74 "Refuse to create same prefixes on different interfaces"); 75 76 extern struct inpcbinfo ripcbinfo; 77 extern struct inpcbinfo udbinfo; 78 79 /* 80 * Return 1 if an internet address is for a ``local'' host 81 * (one to which we have a connection). If subnetsarelocal 82 * is true, this includes other subnets of the local net. 83 * Otherwise, it includes only the directly-connected (sub)nets. 84 */ 85 int 86 in_localaddr(struct in_addr in) 87 { 88 register u_long i = ntohl(in.s_addr); 89 register struct in_ifaddr *ia; 90 91 if (subnetsarelocal) { 92 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 93 if ((i & ia->ia_netmask) == ia->ia_net) 94 return (1); 95 } else { 96 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 97 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 98 return (1); 99 } 100 return (0); 101 } 102 103 /* 104 * Return 1 if an internet address is for the local host and configured 105 * on one of its interfaces. 106 */ 107 int 108 in_localip(struct in_addr in) 109 { 110 struct in_ifaddr *ia; 111 112 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 113 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 114 return 1; 115 } 116 return 0; 117 } 118 119 /* 120 * Determine whether an IP address is in a reserved set of addresses 121 * that may not be forwarded, or whether datagrams to that destination 122 * may be forwarded. 123 */ 124 int 125 in_canforward(struct in_addr in) 126 { 127 register u_long i = ntohl(in.s_addr); 128 register u_long net; 129 130 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 131 return (0); 132 if (IN_CLASSA(i)) { 133 net = i & IN_CLASSA_NET; 134 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 135 return (0); 136 } 137 return (1); 138 } 139 140 /* 141 * Trim a mask in a sockaddr 142 */ 143 static void 144 in_socktrim(struct sockaddr_in *ap) 145 { 146 register char *cplim = (char *) &ap->sin_addr; 147 register char *cp = (char *) (&ap->sin_addr + 1); 148 149 ap->sin_len = 0; 150 while (--cp >= cplim) 151 if (*cp) { 152 (ap)->sin_len = cp - (char *) (ap) + 1; 153 break; 154 } 155 } 156 157 static int 158 in_mask2len(mask) 159 struct in_addr *mask; 160 { 161 int x, y; 162 u_char *p; 163 164 p = (u_char *)mask; 165 for (x = 0; x < sizeof(*mask); x++) { 166 if (p[x] != 0xff) 167 break; 168 } 169 y = 0; 170 if (x < sizeof(*mask)) { 171 for (y = 0; y < 8; y++) { 172 if ((p[x] & (0x80 >> y)) == 0) 173 break; 174 } 175 } 176 return x * 8 + y; 177 } 178 179 static void 180 in_len2mask(struct in_addr *mask, int len) 181 { 182 int i; 183 u_char *p; 184 185 p = (u_char *)mask; 186 bzero(mask, sizeof(*mask)); 187 for (i = 0; i < len / 8; i++) 188 p[i] = 0xff; 189 if (len % 8) 190 p[i] = (0xff00 >> (len % 8)) & 0xff; 191 } 192 193 /* 194 * Generic internet control operations (ioctl's). 195 * Ifp is 0 if not an interface-specific ioctl. 196 */ 197 /* ARGSUSED */ 198 int 199 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 200 struct thread *td) 201 { 202 register struct ifreq *ifr = (struct ifreq *)data; 203 register struct in_ifaddr *ia = 0, *iap; 204 register struct ifaddr *ifa; 205 struct in_addr allhosts_addr; 206 struct in_addr dst; 207 struct in_ifaddr *oia; 208 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 209 struct sockaddr_in oldaddr; 210 int error, hostIsNew, iaIsNew, maskIsNew, s; 211 int iaIsFirst; 212 213 iaIsFirst = 0; 214 iaIsNew = 0; 215 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 216 217 switch (cmd) { 218 case SIOCALIFADDR: 219 if (td != NULL) { 220 error = priv_check(td, PRIV_NET_ADDIFADDR); 221 if (error) 222 return (error); 223 } 224 if (!ifp) 225 return EINVAL; 226 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 227 228 case SIOCDLIFADDR: 229 if (td != NULL) { 230 error = priv_check(td, PRIV_NET_DELIFADDR); 231 if (error) 232 return (error); 233 } 234 if (!ifp) 235 return EINVAL; 236 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 237 238 case SIOCGLIFADDR: 239 if (!ifp) 240 return EINVAL; 241 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 242 } 243 244 /* 245 * Find address for this interface, if it exists. 246 * 247 * If an alias address was specified, find that one instead of 248 * the first one on the interface, if possible. 249 */ 250 if (ifp) { 251 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 252 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 253 if (iap->ia_ifp == ifp && 254 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 255 ia = iap; 256 break; 257 } 258 if (ia == NULL) 259 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 260 iap = ifatoia(ifa); 261 if (iap->ia_addr.sin_family == AF_INET) { 262 ia = iap; 263 break; 264 } 265 } 266 if (ia == NULL) 267 iaIsFirst = 1; 268 } 269 270 switch (cmd) { 271 272 case SIOCAIFADDR: 273 case SIOCDIFADDR: 274 if (ifp == 0) 275 return (EADDRNOTAVAIL); 276 if (ifra->ifra_addr.sin_family == AF_INET) { 277 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 278 if (ia->ia_ifp == ifp && 279 ia->ia_addr.sin_addr.s_addr == 280 ifra->ifra_addr.sin_addr.s_addr) 281 break; 282 } 283 if ((ifp->if_flags & IFF_POINTOPOINT) 284 && (cmd == SIOCAIFADDR) 285 && (ifra->ifra_dstaddr.sin_addr.s_addr 286 == INADDR_ANY)) { 287 return EDESTADDRREQ; 288 } 289 } 290 if (cmd == SIOCDIFADDR && ia == 0) 291 return (EADDRNOTAVAIL); 292 /* FALLTHROUGH */ 293 case SIOCSIFADDR: 294 case SIOCSIFNETMASK: 295 case SIOCSIFDSTADDR: 296 if (td != NULL) { 297 error = priv_check(td, PRIV_NET_ADDIFADDR); 298 if (error) 299 return (error); 300 } 301 302 if (ifp == 0) 303 return (EADDRNOTAVAIL); 304 if (ia == (struct in_ifaddr *)0) { 305 ia = (struct in_ifaddr *) 306 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 307 if (ia == (struct in_ifaddr *)NULL) 308 return (ENOBUFS); 309 /* 310 * Protect from ipintr() traversing address list 311 * while we're modifying it. 312 */ 313 s = splnet(); 314 ifa = &ia->ia_ifa; 315 IFA_LOCK_INIT(ifa); 316 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 317 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 318 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 319 ifa->ifa_refcnt = 1; 320 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 321 322 ia->ia_sockmask.sin_len = 8; 323 ia->ia_sockmask.sin_family = AF_INET; 324 if (ifp->if_flags & IFF_BROADCAST) { 325 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 326 ia->ia_broadaddr.sin_family = AF_INET; 327 } 328 ia->ia_ifp = ifp; 329 330 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 331 splx(s); 332 iaIsNew = 1; 333 } 334 break; 335 336 case SIOCSIFBRDADDR: 337 if (td != NULL) { 338 error = priv_check(td, PRIV_NET_ADDIFADDR); 339 if (error) 340 return (error); 341 } 342 /* FALLTHROUGH */ 343 344 case SIOCGIFADDR: 345 case SIOCGIFNETMASK: 346 case SIOCGIFDSTADDR: 347 case SIOCGIFBRDADDR: 348 if (ia == (struct in_ifaddr *)0) 349 return (EADDRNOTAVAIL); 350 break; 351 } 352 switch (cmd) { 353 354 case SIOCGIFADDR: 355 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 356 return (0); 357 358 case SIOCGIFBRDADDR: 359 if ((ifp->if_flags & IFF_BROADCAST) == 0) 360 return (EINVAL); 361 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 362 return (0); 363 364 case SIOCGIFDSTADDR: 365 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 366 return (EINVAL); 367 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 368 return (0); 369 370 case SIOCGIFNETMASK: 371 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 372 return (0); 373 374 case SIOCSIFDSTADDR: 375 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 376 return (EINVAL); 377 oldaddr = ia->ia_dstaddr; 378 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 379 if (ifp->if_ioctl) { 380 IFF_LOCKGIANT(ifp); 381 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 382 (caddr_t)ia); 383 IFF_UNLOCKGIANT(ifp); 384 if (error) { 385 ia->ia_dstaddr = oldaddr; 386 return (error); 387 } 388 } 389 if (ia->ia_flags & IFA_ROUTE) { 390 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 391 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 392 ia->ia_ifa.ifa_dstaddr = 393 (struct sockaddr *)&ia->ia_dstaddr; 394 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 395 } 396 return (0); 397 398 case SIOCSIFBRDADDR: 399 if ((ifp->if_flags & IFF_BROADCAST) == 0) 400 return (EINVAL); 401 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 402 return (0); 403 404 case SIOCSIFADDR: 405 error = in_ifinit(ifp, ia, 406 (struct sockaddr_in *) &ifr->ifr_addr, 1); 407 if (error != 0 && iaIsNew) 408 break; 409 if (error == 0) { 410 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST) != 0) 411 in_addmulti(&allhosts_addr, ifp); 412 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 413 } 414 return (0); 415 416 case SIOCSIFNETMASK: 417 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 418 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 419 return (0); 420 421 case SIOCAIFADDR: 422 maskIsNew = 0; 423 hostIsNew = 1; 424 error = 0; 425 if (ia->ia_addr.sin_family == AF_INET) { 426 if (ifra->ifra_addr.sin_len == 0) { 427 ifra->ifra_addr = ia->ia_addr; 428 hostIsNew = 0; 429 } else if (ifra->ifra_addr.sin_addr.s_addr == 430 ia->ia_addr.sin_addr.s_addr) 431 hostIsNew = 0; 432 } 433 if (ifra->ifra_mask.sin_len) { 434 in_ifscrub(ifp, ia); 435 ia->ia_sockmask = ifra->ifra_mask; 436 ia->ia_sockmask.sin_family = AF_INET; 437 ia->ia_subnetmask = 438 ntohl(ia->ia_sockmask.sin_addr.s_addr); 439 maskIsNew = 1; 440 } 441 if ((ifp->if_flags & IFF_POINTOPOINT) && 442 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 443 in_ifscrub(ifp, ia); 444 ia->ia_dstaddr = ifra->ifra_dstaddr; 445 maskIsNew = 1; /* We lie; but the effect's the same */ 446 } 447 if (ifra->ifra_addr.sin_family == AF_INET && 448 (hostIsNew || maskIsNew)) 449 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 450 if (error != 0 && iaIsNew) 451 break; 452 453 if ((ifp->if_flags & IFF_BROADCAST) && 454 (ifra->ifra_broadaddr.sin_family == AF_INET)) 455 ia->ia_broadaddr = ifra->ifra_broadaddr; 456 if (error == 0) { 457 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST) != 0) 458 in_addmulti(&allhosts_addr, ifp); 459 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 460 } 461 return (error); 462 463 case SIOCDIFADDR: 464 /* 465 * in_ifscrub kills the interface route. 466 */ 467 in_ifscrub(ifp, ia); 468 /* 469 * in_ifadown gets rid of all the rest of 470 * the routes. This is not quite the right 471 * thing to do, but at least if we are running 472 * a routing process they will come back. 473 */ 474 in_ifadown(&ia->ia_ifa, 1); 475 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 476 error = 0; 477 break; 478 479 default: 480 if (ifp == 0 || ifp->if_ioctl == 0) 481 return (EOPNOTSUPP); 482 IFF_LOCKGIANT(ifp); 483 error = (*ifp->if_ioctl)(ifp, cmd, data); 484 IFF_UNLOCKGIANT(ifp); 485 return (error); 486 } 487 488 /* 489 * Protect from ipintr() traversing address list while we're modifying 490 * it. 491 */ 492 s = splnet(); 493 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 494 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 495 if (ia->ia_addr.sin_family == AF_INET) { 496 LIST_REMOVE(ia, ia_hash); 497 /* 498 * If this is the last IPv4 address configured on this 499 * interface, leave the all-hosts group. 500 * XXX: This is quite ugly because of locking and structure. 501 */ 502 oia = NULL; 503 IFP_TO_IA(ifp, oia); 504 if (oia == NULL) { 505 struct in_multi *inm; 506 507 IFF_LOCKGIANT(ifp); 508 IN_MULTI_LOCK(); 509 IN_LOOKUP_MULTI(allhosts_addr, ifp, inm); 510 if (inm != NULL) 511 in_delmulti_locked(inm); 512 IN_MULTI_UNLOCK(); 513 IFF_UNLOCKGIANT(ifp); 514 } 515 } 516 IFAFREE(&ia->ia_ifa); 517 splx(s); 518 519 return (error); 520 } 521 522 /* 523 * SIOC[GAD]LIFADDR. 524 * SIOCGLIFADDR: get first address. (?!?) 525 * SIOCGLIFADDR with IFLR_PREFIX: 526 * get first address that matches the specified prefix. 527 * SIOCALIFADDR: add the specified address. 528 * SIOCALIFADDR with IFLR_PREFIX: 529 * EINVAL since we can't deduce hostid part of the address. 530 * SIOCDLIFADDR: delete the specified address. 531 * SIOCDLIFADDR with IFLR_PREFIX: 532 * delete the first address that matches the specified prefix. 533 * return values: 534 * EINVAL on invalid parameters 535 * EADDRNOTAVAIL on prefix match failed/specified address not found 536 * other values may be returned from in_ioctl() 537 */ 538 static int 539 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 540 struct ifnet *ifp, struct thread *td) 541 { 542 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 543 struct ifaddr *ifa; 544 545 /* sanity checks */ 546 if (!data || !ifp) { 547 panic("invalid argument to in_lifaddr_ioctl"); 548 /*NOTRECHED*/ 549 } 550 551 switch (cmd) { 552 case SIOCGLIFADDR: 553 /* address must be specified on GET with IFLR_PREFIX */ 554 if ((iflr->flags & IFLR_PREFIX) == 0) 555 break; 556 /*FALLTHROUGH*/ 557 case SIOCALIFADDR: 558 case SIOCDLIFADDR: 559 /* address must be specified on ADD and DELETE */ 560 if (iflr->addr.ss_family != AF_INET) 561 return EINVAL; 562 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 563 return EINVAL; 564 /* XXX need improvement */ 565 if (iflr->dstaddr.ss_family 566 && iflr->dstaddr.ss_family != AF_INET) 567 return EINVAL; 568 if (iflr->dstaddr.ss_family 569 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 570 return EINVAL; 571 break; 572 default: /*shouldn't happen*/ 573 return EOPNOTSUPP; 574 } 575 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 576 return EINVAL; 577 578 switch (cmd) { 579 case SIOCALIFADDR: 580 { 581 struct in_aliasreq ifra; 582 583 if (iflr->flags & IFLR_PREFIX) 584 return EINVAL; 585 586 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 587 bzero(&ifra, sizeof(ifra)); 588 bcopy(iflr->iflr_name, ifra.ifra_name, 589 sizeof(ifra.ifra_name)); 590 591 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 592 593 if (iflr->dstaddr.ss_family) { /*XXX*/ 594 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 595 iflr->dstaddr.ss_len); 596 } 597 598 ifra.ifra_mask.sin_family = AF_INET; 599 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 600 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 601 602 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 603 } 604 case SIOCGLIFADDR: 605 case SIOCDLIFADDR: 606 { 607 struct in_ifaddr *ia; 608 struct in_addr mask, candidate, match; 609 struct sockaddr_in *sin; 610 611 bzero(&mask, sizeof(mask)); 612 bzero(&match, sizeof(match)); 613 if (iflr->flags & IFLR_PREFIX) { 614 /* lookup a prefix rather than address. */ 615 in_len2mask(&mask, iflr->prefixlen); 616 617 sin = (struct sockaddr_in *)&iflr->addr; 618 match.s_addr = sin->sin_addr.s_addr; 619 match.s_addr &= mask.s_addr; 620 621 /* if you set extra bits, that's wrong */ 622 if (match.s_addr != sin->sin_addr.s_addr) 623 return EINVAL; 624 625 } else { 626 /* on getting an address, take the 1st match */ 627 /* on deleting an address, do exact match */ 628 if (cmd != SIOCGLIFADDR) { 629 in_len2mask(&mask, 32); 630 sin = (struct sockaddr_in *)&iflr->addr; 631 match.s_addr = sin->sin_addr.s_addr; 632 } 633 } 634 635 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 636 if (ifa->ifa_addr->sa_family != AF_INET6) 637 continue; 638 if (match.s_addr == 0) 639 break; 640 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 641 candidate.s_addr &= mask.s_addr; 642 if (candidate.s_addr == match.s_addr) 643 break; 644 } 645 if (!ifa) 646 return EADDRNOTAVAIL; 647 ia = (struct in_ifaddr *)ifa; 648 649 if (cmd == SIOCGLIFADDR) { 650 /* fill in the if_laddrreq structure */ 651 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 652 653 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 654 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 655 ia->ia_dstaddr.sin_len); 656 } else 657 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 658 659 iflr->prefixlen = 660 in_mask2len(&ia->ia_sockmask.sin_addr); 661 662 iflr->flags = 0; /*XXX*/ 663 664 return 0; 665 } else { 666 struct in_aliasreq ifra; 667 668 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 669 bzero(&ifra, sizeof(ifra)); 670 bcopy(iflr->iflr_name, ifra.ifra_name, 671 sizeof(ifra.ifra_name)); 672 673 bcopy(&ia->ia_addr, &ifra.ifra_addr, 674 ia->ia_addr.sin_len); 675 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 676 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 677 ia->ia_dstaddr.sin_len); 678 } 679 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 680 ia->ia_sockmask.sin_len); 681 682 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 683 ifp, td); 684 } 685 } 686 } 687 688 return EOPNOTSUPP; /*just for safety*/ 689 } 690 691 /* 692 * Delete any existing route for an interface. 693 */ 694 void 695 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 696 { 697 698 in_scrubprefix(ia); 699 } 700 701 /* 702 * Initialize an interface's internet address 703 * and routing table entry. 704 */ 705 static int 706 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 707 int scrub) 708 { 709 register u_long i = ntohl(sin->sin_addr.s_addr); 710 struct sockaddr_in oldaddr; 711 int s = splimp(), flags = RTF_UP, error = 0; 712 713 oldaddr = ia->ia_addr; 714 if (oldaddr.sin_family == AF_INET) 715 LIST_REMOVE(ia, ia_hash); 716 ia->ia_addr = *sin; 717 if (ia->ia_addr.sin_family == AF_INET) 718 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 719 ia, ia_hash); 720 /* 721 * Give the interface a chance to initialize 722 * if this is its first address, 723 * and to validate the address if necessary. 724 */ 725 if (ifp->if_ioctl) { 726 IFF_LOCKGIANT(ifp); 727 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 728 IFF_UNLOCKGIANT(ifp); 729 if (error) { 730 splx(s); 731 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 732 ia->ia_addr = oldaddr; 733 if (ia->ia_addr.sin_family == AF_INET) 734 LIST_INSERT_HEAD(INADDR_HASH( 735 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 736 return (error); 737 } 738 } 739 splx(s); 740 if (scrub) { 741 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 742 in_ifscrub(ifp, ia); 743 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 744 } 745 if (IN_CLASSA(i)) 746 ia->ia_netmask = IN_CLASSA_NET; 747 else if (IN_CLASSB(i)) 748 ia->ia_netmask = IN_CLASSB_NET; 749 else 750 ia->ia_netmask = IN_CLASSC_NET; 751 /* 752 * The subnet mask usually includes at least the standard network part, 753 * but may may be smaller in the case of supernetting. 754 * If it is set, we believe it. 755 */ 756 if (ia->ia_subnetmask == 0) { 757 ia->ia_subnetmask = ia->ia_netmask; 758 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 759 } else 760 ia->ia_netmask &= ia->ia_subnetmask; 761 ia->ia_net = i & ia->ia_netmask; 762 ia->ia_subnet = i & ia->ia_subnetmask; 763 in_socktrim(&ia->ia_sockmask); 764 #ifdef DEV_CARP 765 /* 766 * XXX: carp(4) does not have interface route 767 */ 768 if (ifp->if_type == IFT_CARP) 769 return (0); 770 #endif 771 /* 772 * Add route for the network. 773 */ 774 ia->ia_ifa.ifa_metric = ifp->if_metric; 775 if (ifp->if_flags & IFF_BROADCAST) { 776 ia->ia_broadaddr.sin_addr.s_addr = 777 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 778 ia->ia_netbroadcast.s_addr = 779 htonl(ia->ia_net | ~ ia->ia_netmask); 780 } else if (ifp->if_flags & IFF_LOOPBACK) { 781 ia->ia_dstaddr = ia->ia_addr; 782 flags |= RTF_HOST; 783 } else if (ifp->if_flags & IFF_POINTOPOINT) { 784 if (ia->ia_dstaddr.sin_family != AF_INET) 785 return (0); 786 flags |= RTF_HOST; 787 } 788 if ((error = in_addprefix(ia, flags)) != 0) 789 return (error); 790 791 return (error); 792 } 793 794 #define rtinitflags(x) \ 795 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 796 ? RTF_HOST : 0) 797 /* 798 * Check if we have a route for the given prefix already or add one accordingly. 799 */ 800 static int 801 in_addprefix(struct in_ifaddr *target, int flags) 802 { 803 struct in_ifaddr *ia; 804 struct in_addr prefix, mask, p, m; 805 int error; 806 807 if ((flags & RTF_HOST) != 0) { 808 prefix = target->ia_dstaddr.sin_addr; 809 mask.s_addr = 0; 810 } else { 811 prefix = target->ia_addr.sin_addr; 812 mask = target->ia_sockmask.sin_addr; 813 prefix.s_addr &= mask.s_addr; 814 } 815 816 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 817 if (rtinitflags(ia)) { 818 p = ia->ia_addr.sin_addr; 819 820 if (prefix.s_addr != p.s_addr) 821 continue; 822 } else { 823 p = ia->ia_addr.sin_addr; 824 m = ia->ia_sockmask.sin_addr; 825 p.s_addr &= m.s_addr; 826 827 if (prefix.s_addr != p.s_addr || 828 mask.s_addr != m.s_addr) 829 continue; 830 } 831 832 /* 833 * If we got a matching prefix route inserted by other 834 * interface address, we are done here. 835 */ 836 if (ia->ia_flags & IFA_ROUTE) { 837 if (sameprefixcarponly && 838 target->ia_ifp->if_type != IFT_CARP && 839 ia->ia_ifp->if_type != IFT_CARP) 840 return (EEXIST); 841 else 842 return (0); 843 } 844 } 845 846 /* 847 * No-one seem to have this prefix route, so we try to insert it. 848 */ 849 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 850 if (!error) 851 target->ia_flags |= IFA_ROUTE; 852 return error; 853 } 854 855 /* 856 * If there is no other address in the system that can serve a route to the 857 * same prefix, remove the route. Hand over the route to the new address 858 * otherwise. 859 */ 860 static int 861 in_scrubprefix(struct in_ifaddr *target) 862 { 863 struct in_ifaddr *ia; 864 struct in_addr prefix, mask, p; 865 int error; 866 867 if ((target->ia_flags & IFA_ROUTE) == 0) 868 return 0; 869 870 if (rtinitflags(target)) 871 prefix = target->ia_dstaddr.sin_addr; 872 else { 873 prefix = target->ia_addr.sin_addr; 874 mask = target->ia_sockmask.sin_addr; 875 prefix.s_addr &= mask.s_addr; 876 } 877 878 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 879 if (rtinitflags(ia)) 880 p = ia->ia_dstaddr.sin_addr; 881 else { 882 p = ia->ia_addr.sin_addr; 883 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 884 } 885 886 if (prefix.s_addr != p.s_addr) 887 continue; 888 889 /* 890 * If we got a matching prefix address, move IFA_ROUTE and 891 * the route itself to it. Make sure that routing daemons 892 * get a heads-up. 893 * 894 * XXX: a special case for carp(4) interface 895 */ 896 if ((ia->ia_flags & IFA_ROUTE) == 0 897 #ifdef DEV_CARP 898 && (ia->ia_ifp->if_type != IFT_CARP) 899 #endif 900 ) { 901 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 902 rtinitflags(target)); 903 target->ia_flags &= ~IFA_ROUTE; 904 905 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 906 rtinitflags(ia) | RTF_UP); 907 if (error == 0) 908 ia->ia_flags |= IFA_ROUTE; 909 return error; 910 } 911 } 912 913 /* 914 * As no-one seem to have this prefix, we can remove the route. 915 */ 916 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 917 target->ia_flags &= ~IFA_ROUTE; 918 return 0; 919 } 920 921 #undef rtinitflags 922 923 /* 924 * Return 1 if the address might be a local broadcast address. 925 */ 926 int 927 in_broadcast(struct in_addr in, struct ifnet *ifp) 928 { 929 register struct ifaddr *ifa; 930 u_long t; 931 932 if (in.s_addr == INADDR_BROADCAST || 933 in.s_addr == INADDR_ANY) 934 return 1; 935 if ((ifp->if_flags & IFF_BROADCAST) == 0) 936 return 0; 937 t = ntohl(in.s_addr); 938 /* 939 * Look through the list of addresses for a match 940 * with a broadcast address. 941 */ 942 #define ia ((struct in_ifaddr *)ifa) 943 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 944 if (ifa->ifa_addr->sa_family == AF_INET && 945 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 946 in.s_addr == ia->ia_netbroadcast.s_addr || 947 /* 948 * Check for old-style (host 0) broadcast. 949 */ 950 t == ia->ia_subnet || t == ia->ia_net) && 951 /* 952 * Check for an all one subnetmask. These 953 * only exist when an interface gets a secondary 954 * address. 955 */ 956 ia->ia_subnetmask != (u_long)0xffffffff) 957 return 1; 958 return (0); 959 #undef ia 960 } 961 962 /* 963 * Delete all IPv4 multicast address records, and associated link-layer 964 * multicast address records, associated with ifp. 965 */ 966 static void 967 in_purgemaddrs(struct ifnet *ifp) 968 { 969 struct in_multi *inm; 970 struct in_multi *oinm; 971 972 #ifdef DIAGNOSTIC 973 printf("%s: purging ifp %p\n", __func__, ifp); 974 #endif 975 IFF_LOCKGIANT(ifp); 976 IN_MULTI_LOCK(); 977 LIST_FOREACH_SAFE(inm, &in_multihead, inm_link, oinm) { 978 if (inm->inm_ifp == ifp) 979 in_delmulti_locked(inm); 980 } 981 IN_MULTI_UNLOCK(); 982 IFF_UNLOCKGIANT(ifp); 983 } 984 985 /* 986 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 987 */ 988 void 989 in_ifdetach(struct ifnet *ifp) 990 { 991 992 in_pcbpurgeif0(&ripcbinfo, ifp); 993 in_pcbpurgeif0(&udbinfo, ifp); 994 in_purgemaddrs(ifp); 995 } 996