Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/in.c
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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 * $FreeBSD: releng/6.0/sys/netinet/in.c 151380 2005-10-16 17:12:18Z rwatson $ 32 */ 33 34 #include "opt_carp.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/sockio.h> 39 #include <sys/malloc.h> 40 #include <sys/socket.h> 41 #include <sys/kernel.h> 42 #include <sys/sysctl.h> 43 44 #include <net/if.h> 45 #include <net/if_types.h> 46 #include <net/route.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_var.h> 50 #include <netinet/in_pcb.h> 51 52 #include <netinet/igmp_var.h> 53 54 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 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 67 static int subnetsarelocal = 0; 68 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 69 &subnetsarelocal, 0, "Treat all subnets as directly connected"); 70 static int sameprefixcarponly = 0; 71 SYSCTL_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 72 &sameprefixcarponly, 0, 73 "Refuse to create same prefixes on different interfaces"); 74 75 /* 76 * The IPv4 multicast list (in_multihead and associated structures) are 77 * protected by the global in_multi_mtx. See in_var.h for more details. For 78 * now, in_multi_mtx is marked as recursible due to IGMP's calling back into 79 * ip_output() to send IGMP packets while holding the lock; this probably is 80 * not quite desirable. 81 */ 82 struct in_multihead in_multihead; /* XXX BSS initialization */ 83 struct mtx in_multi_mtx; 84 MTX_SYSINIT(in_multi_mtx, &in_multi_mtx, "in_multi_mtx", MTX_DEF | MTX_RECURSE); 85 86 extern struct inpcbinfo ripcbinfo; 87 extern struct inpcbinfo udbinfo; 88 89 /* 90 * Return 1 if an internet address is for a ``local'' host 91 * (one to which we have a connection). If subnetsarelocal 92 * is true, this includes other subnets of the local net. 93 * Otherwise, it includes only the directly-connected (sub)nets. 94 */ 95 int 96 in_localaddr(in) 97 struct in_addr in; 98 { 99 register u_long i = ntohl(in.s_addr); 100 register struct in_ifaddr *ia; 101 102 if (subnetsarelocal) { 103 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 104 if ((i & ia->ia_netmask) == ia->ia_net) 105 return (1); 106 } else { 107 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 108 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 109 return (1); 110 } 111 return (0); 112 } 113 114 /* 115 * Return 1 if an internet address is for the local host and configured 116 * on one of its interfaces. 117 */ 118 int 119 in_localip(in) 120 struct in_addr in; 121 { 122 struct in_ifaddr *ia; 123 124 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 125 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 126 return 1; 127 } 128 return 0; 129 } 130 131 /* 132 * Determine whether an IP address is in a reserved set of addresses 133 * that may not be forwarded, or whether datagrams to that destination 134 * may be forwarded. 135 */ 136 int 137 in_canforward(in) 138 struct in_addr in; 139 { 140 register u_long i = ntohl(in.s_addr); 141 register u_long net; 142 143 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 144 return (0); 145 if (IN_CLASSA(i)) { 146 net = i & IN_CLASSA_NET; 147 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 148 return (0); 149 } 150 return (1); 151 } 152 153 /* 154 * Trim a mask in a sockaddr 155 */ 156 static void 157 in_socktrim(ap) 158 struct sockaddr_in *ap; 159 { 160 register char *cplim = (char *) &ap->sin_addr; 161 register char *cp = (char *) (&ap->sin_addr + 1); 162 163 ap->sin_len = 0; 164 while (--cp >= cplim) 165 if (*cp) { 166 (ap)->sin_len = cp - (char *) (ap) + 1; 167 break; 168 } 169 } 170 171 static int 172 in_mask2len(mask) 173 struct in_addr *mask; 174 { 175 int x, y; 176 u_char *p; 177 178 p = (u_char *)mask; 179 for (x = 0; x < sizeof(*mask); x++) { 180 if (p[x] != 0xff) 181 break; 182 } 183 y = 0; 184 if (x < sizeof(*mask)) { 185 for (y = 0; y < 8; y++) { 186 if ((p[x] & (0x80 >> y)) == 0) 187 break; 188 } 189 } 190 return x * 8 + y; 191 } 192 193 static void 194 in_len2mask(mask, len) 195 struct in_addr *mask; 196 int len; 197 { 198 int i; 199 u_char *p; 200 201 p = (u_char *)mask; 202 bzero(mask, sizeof(*mask)); 203 for (i = 0; i < len / 8; i++) 204 p[i] = 0xff; 205 if (len % 8) 206 p[i] = (0xff00 >> (len % 8)) & 0xff; 207 } 208 209 /* 210 * Generic internet control operations (ioctl's). 211 * Ifp is 0 if not an interface-specific ioctl. 212 */ 213 /* ARGSUSED */ 214 int 215 in_control(so, cmd, data, ifp, td) 216 struct socket *so; 217 u_long cmd; 218 caddr_t data; 219 register struct ifnet *ifp; 220 struct thread *td; 221 { 222 register struct ifreq *ifr = (struct ifreq *)data; 223 register struct in_ifaddr *ia = 0, *iap; 224 register struct ifaddr *ifa; 225 struct in_addr dst; 226 struct in_ifaddr *oia; 227 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 228 struct sockaddr_in oldaddr; 229 int error, hostIsNew, iaIsNew, maskIsNew, s; 230 231 iaIsNew = 0; 232 233 switch (cmd) { 234 case SIOCALIFADDR: 235 case SIOCDLIFADDR: 236 if (td && (error = suser(td)) != 0) 237 return error; 238 /*fall through*/ 239 case SIOCGLIFADDR: 240 if (!ifp) 241 return EINVAL; 242 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 243 } 244 245 /* 246 * Find address for this interface, if it exists. 247 * 248 * If an alias address was specified, find that one instead of 249 * the first one on the interface, if possible. 250 */ 251 if (ifp) { 252 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 253 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 254 if (iap->ia_ifp == ifp && 255 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 256 ia = iap; 257 break; 258 } 259 if (ia == NULL) 260 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 261 iap = ifatoia(ifa); 262 if (iap->ia_addr.sin_family == AF_INET) { 263 ia = iap; 264 break; 265 } 266 } 267 } 268 269 switch (cmd) { 270 271 case SIOCAIFADDR: 272 case SIOCDIFADDR: 273 if (ifp == 0) 274 return (EADDRNOTAVAIL); 275 if (ifra->ifra_addr.sin_family == AF_INET) { 276 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 277 if (ia->ia_ifp == ifp && 278 ia->ia_addr.sin_addr.s_addr == 279 ifra->ifra_addr.sin_addr.s_addr) 280 break; 281 } 282 if ((ifp->if_flags & IFF_POINTOPOINT) 283 && (cmd == SIOCAIFADDR) 284 && (ifra->ifra_dstaddr.sin_addr.s_addr 285 == INADDR_ANY)) { 286 return EDESTADDRREQ; 287 } 288 } 289 if (cmd == SIOCDIFADDR && ia == 0) 290 return (EADDRNOTAVAIL); 291 /* FALLTHROUGH */ 292 case SIOCSIFADDR: 293 case SIOCSIFNETMASK: 294 case SIOCSIFDSTADDR: 295 if (td && (error = suser(td)) != 0) 296 return error; 297 298 if (ifp == 0) 299 return (EADDRNOTAVAIL); 300 if (ia == (struct in_ifaddr *)0) { 301 ia = (struct in_ifaddr *) 302 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 303 if (ia == (struct in_ifaddr *)NULL) 304 return (ENOBUFS); 305 /* 306 * Protect from ipintr() traversing address list 307 * while we're modifying it. 308 */ 309 s = splnet(); 310 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 311 312 ifa = &ia->ia_ifa; 313 IFA_LOCK_INIT(ifa); 314 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 315 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 316 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 317 ifa->ifa_refcnt = 1; 318 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 319 320 ia->ia_sockmask.sin_len = 8; 321 ia->ia_sockmask.sin_family = AF_INET; 322 if (ifp->if_flags & IFF_BROADCAST) { 323 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 324 ia->ia_broadaddr.sin_family = AF_INET; 325 } 326 ia->ia_ifp = ifp; 327 splx(s); 328 iaIsNew = 1; 329 } 330 break; 331 332 case SIOCSIFBRDADDR: 333 if (td && (error = suser(td)) != 0) 334 return error; 335 /* FALLTHROUGH */ 336 337 case SIOCGIFADDR: 338 case SIOCGIFNETMASK: 339 case SIOCGIFDSTADDR: 340 case SIOCGIFBRDADDR: 341 if (ia == (struct in_ifaddr *)0) 342 return (EADDRNOTAVAIL); 343 break; 344 } 345 switch (cmd) { 346 347 case SIOCGIFADDR: 348 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 349 return (0); 350 351 case SIOCGIFBRDADDR: 352 if ((ifp->if_flags & IFF_BROADCAST) == 0) 353 return (EINVAL); 354 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 355 return (0); 356 357 case SIOCGIFDSTADDR: 358 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 359 return (EINVAL); 360 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 361 return (0); 362 363 case SIOCGIFNETMASK: 364 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 365 return (0); 366 367 case SIOCSIFDSTADDR: 368 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 369 return (EINVAL); 370 oldaddr = ia->ia_dstaddr; 371 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 372 if (ifp->if_ioctl) { 373 IFF_LOCKGIANT(ifp); 374 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 375 (caddr_t)ia); 376 IFF_UNLOCKGIANT(ifp); 377 if (error) { 378 ia->ia_dstaddr = oldaddr; 379 return (error); 380 } 381 } 382 if (ia->ia_flags & IFA_ROUTE) { 383 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 384 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 385 ia->ia_ifa.ifa_dstaddr = 386 (struct sockaddr *)&ia->ia_dstaddr; 387 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 388 } 389 return (0); 390 391 case SIOCSIFBRDADDR: 392 if ((ifp->if_flags & IFF_BROADCAST) == 0) 393 return (EINVAL); 394 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 395 return (0); 396 397 case SIOCSIFADDR: 398 error = in_ifinit(ifp, ia, 399 (struct sockaddr_in *) &ifr->ifr_addr, 1); 400 if (error != 0 && iaIsNew) 401 break; 402 if (error == 0) 403 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 404 return (0); 405 406 case SIOCSIFNETMASK: 407 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 408 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 409 return (0); 410 411 case SIOCAIFADDR: 412 maskIsNew = 0; 413 hostIsNew = 1; 414 error = 0; 415 if (ia->ia_addr.sin_family == AF_INET) { 416 if (ifra->ifra_addr.sin_len == 0) { 417 ifra->ifra_addr = ia->ia_addr; 418 hostIsNew = 0; 419 } else if (ifra->ifra_addr.sin_addr.s_addr == 420 ia->ia_addr.sin_addr.s_addr) 421 hostIsNew = 0; 422 } 423 if (ifra->ifra_mask.sin_len) { 424 in_ifscrub(ifp, ia); 425 ia->ia_sockmask = ifra->ifra_mask; 426 ia->ia_sockmask.sin_family = AF_INET; 427 ia->ia_subnetmask = 428 ntohl(ia->ia_sockmask.sin_addr.s_addr); 429 maskIsNew = 1; 430 } 431 if ((ifp->if_flags & IFF_POINTOPOINT) && 432 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 433 in_ifscrub(ifp, ia); 434 ia->ia_dstaddr = ifra->ifra_dstaddr; 435 maskIsNew = 1; /* We lie; but the effect's the same */ 436 } 437 if (ifra->ifra_addr.sin_family == AF_INET && 438 (hostIsNew || maskIsNew)) 439 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 440 if (error != 0 && iaIsNew) 441 break; 442 443 if ((ifp->if_flags & IFF_BROADCAST) && 444 (ifra->ifra_broadaddr.sin_family == AF_INET)) 445 ia->ia_broadaddr = ifra->ifra_broadaddr; 446 if (error == 0) 447 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 448 return (error); 449 450 case SIOCDIFADDR: 451 /* 452 * in_ifscrub kills the interface route. 453 */ 454 in_ifscrub(ifp, ia); 455 /* 456 * in_ifadown gets rid of all the rest of 457 * the routes. This is not quite the right 458 * thing to do, but at least if we are running 459 * a routing process they will come back. 460 */ 461 in_ifadown(&ia->ia_ifa, 1); 462 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 463 error = 0; 464 break; 465 466 default: 467 if (ifp == 0 || ifp->if_ioctl == 0) 468 return (EOPNOTSUPP); 469 IFF_LOCKGIANT(ifp); 470 error = (*ifp->if_ioctl)(ifp, cmd, data); 471 IFF_UNLOCKGIANT(ifp); 472 return (error); 473 } 474 475 /* 476 * Protect from ipintr() traversing address list while we're modifying 477 * it. 478 */ 479 s = splnet(); 480 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 481 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 482 LIST_REMOVE(ia, ia_hash); 483 IFAFREE(&ia->ia_ifa); 484 splx(s); 485 486 return (error); 487 } 488 489 /* 490 * SIOC[GAD]LIFADDR. 491 * SIOCGLIFADDR: get first address. (?!?) 492 * SIOCGLIFADDR with IFLR_PREFIX: 493 * get first address that matches the specified prefix. 494 * SIOCALIFADDR: add the specified address. 495 * SIOCALIFADDR with IFLR_PREFIX: 496 * EINVAL since we can't deduce hostid part of the address. 497 * SIOCDLIFADDR: delete the specified address. 498 * SIOCDLIFADDR with IFLR_PREFIX: 499 * delete the first address that matches the specified prefix. 500 * return values: 501 * EINVAL on invalid parameters 502 * EADDRNOTAVAIL on prefix match failed/specified address not found 503 * other values may be returned from in_ioctl() 504 */ 505 static int 506 in_lifaddr_ioctl(so, cmd, data, ifp, td) 507 struct socket *so; 508 u_long cmd; 509 caddr_t data; 510 struct ifnet *ifp; 511 struct thread *td; 512 { 513 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 514 struct ifaddr *ifa; 515 516 /* sanity checks */ 517 if (!data || !ifp) { 518 panic("invalid argument to in_lifaddr_ioctl"); 519 /*NOTRECHED*/ 520 } 521 522 switch (cmd) { 523 case SIOCGLIFADDR: 524 /* address must be specified on GET with IFLR_PREFIX */ 525 if ((iflr->flags & IFLR_PREFIX) == 0) 526 break; 527 /*FALLTHROUGH*/ 528 case SIOCALIFADDR: 529 case SIOCDLIFADDR: 530 /* address must be specified on ADD and DELETE */ 531 if (iflr->addr.ss_family != AF_INET) 532 return EINVAL; 533 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 534 return EINVAL; 535 /* XXX need improvement */ 536 if (iflr->dstaddr.ss_family 537 && iflr->dstaddr.ss_family != AF_INET) 538 return EINVAL; 539 if (iflr->dstaddr.ss_family 540 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 541 return EINVAL; 542 break; 543 default: /*shouldn't happen*/ 544 return EOPNOTSUPP; 545 } 546 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 547 return EINVAL; 548 549 switch (cmd) { 550 case SIOCALIFADDR: 551 { 552 struct in_aliasreq ifra; 553 554 if (iflr->flags & IFLR_PREFIX) 555 return EINVAL; 556 557 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 558 bzero(&ifra, sizeof(ifra)); 559 bcopy(iflr->iflr_name, ifra.ifra_name, 560 sizeof(ifra.ifra_name)); 561 562 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 563 564 if (iflr->dstaddr.ss_family) { /*XXX*/ 565 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 566 iflr->dstaddr.ss_len); 567 } 568 569 ifra.ifra_mask.sin_family = AF_INET; 570 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 571 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 572 573 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 574 } 575 case SIOCGLIFADDR: 576 case SIOCDLIFADDR: 577 { 578 struct in_ifaddr *ia; 579 struct in_addr mask, candidate, match; 580 struct sockaddr_in *sin; 581 int cmp; 582 583 bzero(&mask, sizeof(mask)); 584 if (iflr->flags & IFLR_PREFIX) { 585 /* lookup a prefix rather than address. */ 586 in_len2mask(&mask, iflr->prefixlen); 587 588 sin = (struct sockaddr_in *)&iflr->addr; 589 match.s_addr = sin->sin_addr.s_addr; 590 match.s_addr &= mask.s_addr; 591 592 /* if you set extra bits, that's wrong */ 593 if (match.s_addr != sin->sin_addr.s_addr) 594 return EINVAL; 595 596 cmp = 1; 597 } else { 598 if (cmd == SIOCGLIFADDR) { 599 /* on getting an address, take the 1st match */ 600 cmp = 0; /*XXX*/ 601 } else { 602 /* on deleting an address, do exact match */ 603 in_len2mask(&mask, 32); 604 sin = (struct sockaddr_in *)&iflr->addr; 605 match.s_addr = sin->sin_addr.s_addr; 606 607 cmp = 1; 608 } 609 } 610 611 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 612 if (ifa->ifa_addr->sa_family != AF_INET6) 613 continue; 614 if (!cmp) 615 break; 616 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 617 candidate.s_addr &= mask.s_addr; 618 if (candidate.s_addr == match.s_addr) 619 break; 620 } 621 if (!ifa) 622 return EADDRNOTAVAIL; 623 ia = (struct in_ifaddr *)ifa; 624 625 if (cmd == SIOCGLIFADDR) { 626 /* fill in the if_laddrreq structure */ 627 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 628 629 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 630 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 631 ia->ia_dstaddr.sin_len); 632 } else 633 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 634 635 iflr->prefixlen = 636 in_mask2len(&ia->ia_sockmask.sin_addr); 637 638 iflr->flags = 0; /*XXX*/ 639 640 return 0; 641 } else { 642 struct in_aliasreq ifra; 643 644 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 645 bzero(&ifra, sizeof(ifra)); 646 bcopy(iflr->iflr_name, ifra.ifra_name, 647 sizeof(ifra.ifra_name)); 648 649 bcopy(&ia->ia_addr, &ifra.ifra_addr, 650 ia->ia_addr.sin_len); 651 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 652 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 653 ia->ia_dstaddr.sin_len); 654 } 655 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 656 ia->ia_sockmask.sin_len); 657 658 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 659 ifp, td); 660 } 661 } 662 } 663 664 return EOPNOTSUPP; /*just for safety*/ 665 } 666 667 /* 668 * Delete any existing route for an interface. 669 */ 670 void 671 in_ifscrub(ifp, ia) 672 register struct ifnet *ifp; 673 register struct in_ifaddr *ia; 674 { 675 in_scrubprefix(ia); 676 } 677 678 /* 679 * Initialize an interface's internet address 680 * and routing table entry. 681 */ 682 static int 683 in_ifinit(ifp, ia, sin, scrub) 684 register struct ifnet *ifp; 685 register struct in_ifaddr *ia; 686 struct sockaddr_in *sin; 687 int scrub; 688 { 689 register u_long i = ntohl(sin->sin_addr.s_addr); 690 struct sockaddr_in oldaddr; 691 int s = splimp(), flags = RTF_UP, error = 0; 692 693 oldaddr = ia->ia_addr; 694 if (oldaddr.sin_family == AF_INET) 695 LIST_REMOVE(ia, ia_hash); 696 ia->ia_addr = *sin; 697 if (ia->ia_addr.sin_family == AF_INET) 698 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 699 ia, ia_hash); 700 /* 701 * Give the interface a chance to initialize 702 * if this is its first address, 703 * and to validate the address if necessary. 704 */ 705 if (ifp->if_ioctl) { 706 IFF_LOCKGIANT(ifp); 707 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 708 IFF_UNLOCKGIANT(ifp); 709 if (error) { 710 splx(s); 711 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 712 ia->ia_addr = oldaddr; 713 if (ia->ia_addr.sin_family == AF_INET) 714 LIST_INSERT_HEAD(INADDR_HASH( 715 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 716 return (error); 717 } 718 } 719 splx(s); 720 if (scrub) { 721 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 722 in_ifscrub(ifp, ia); 723 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 724 } 725 if (IN_CLASSA(i)) 726 ia->ia_netmask = IN_CLASSA_NET; 727 else if (IN_CLASSB(i)) 728 ia->ia_netmask = IN_CLASSB_NET; 729 else 730 ia->ia_netmask = IN_CLASSC_NET; 731 /* 732 * The subnet mask usually includes at least the standard network part, 733 * but may may be smaller in the case of supernetting. 734 * If it is set, we believe it. 735 */ 736 if (ia->ia_subnetmask == 0) { 737 ia->ia_subnetmask = ia->ia_netmask; 738 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 739 } else 740 ia->ia_netmask &= ia->ia_subnetmask; 741 ia->ia_net = i & ia->ia_netmask; 742 ia->ia_subnet = i & ia->ia_subnetmask; 743 in_socktrim(&ia->ia_sockmask); 744 #ifdef DEV_CARP 745 /* 746 * XXX: carp(4) does not have interface route 747 */ 748 if (ifp->if_type == IFT_CARP) 749 return (0); 750 #endif 751 /* 752 * Add route for the network. 753 */ 754 ia->ia_ifa.ifa_metric = ifp->if_metric; 755 if (ifp->if_flags & IFF_BROADCAST) { 756 ia->ia_broadaddr.sin_addr.s_addr = 757 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 758 ia->ia_netbroadcast.s_addr = 759 htonl(ia->ia_net | ~ ia->ia_netmask); 760 } else if (ifp->if_flags & IFF_LOOPBACK) { 761 ia->ia_dstaddr = ia->ia_addr; 762 flags |= RTF_HOST; 763 } else if (ifp->if_flags & IFF_POINTOPOINT) { 764 if (ia->ia_dstaddr.sin_family != AF_INET) 765 return (0); 766 flags |= RTF_HOST; 767 } 768 if ((error = in_addprefix(ia, flags)) != 0) 769 return (error); 770 771 /* 772 * If the interface supports multicast, join the "all hosts" 773 * multicast group on that interface. 774 */ 775 if (ifp->if_flags & IFF_MULTICAST) { 776 struct in_addr addr; 777 778 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 779 in_addmulti(&addr, ifp); 780 } 781 return (error); 782 } 783 784 #define rtinitflags(x) \ 785 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 786 ? RTF_HOST : 0) 787 /* 788 * Check if we have a route for the given prefix already or add a one 789 * accordingly. 790 */ 791 static int 792 in_addprefix(target, flags) 793 struct in_ifaddr *target; 794 int flags; 795 { 796 struct in_ifaddr *ia; 797 struct in_addr prefix, mask, p; 798 int error; 799 800 if ((flags & RTF_HOST) != 0) 801 prefix = target->ia_dstaddr.sin_addr; 802 else { 803 prefix = target->ia_addr.sin_addr; 804 mask = target->ia_sockmask.sin_addr; 805 prefix.s_addr &= mask.s_addr; 806 } 807 808 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 809 if (rtinitflags(ia)) 810 p = ia->ia_dstaddr.sin_addr; 811 else { 812 p = ia->ia_addr.sin_addr; 813 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 814 } 815 816 if (prefix.s_addr != p.s_addr) 817 continue; 818 819 /* 820 * If we got a matching prefix route inserted by other 821 * interface address, we are done here. 822 */ 823 if (ia->ia_flags & IFA_ROUTE) { 824 if (sameprefixcarponly && 825 target->ia_ifp->if_type != IFT_CARP && 826 ia->ia_ifp->if_type != IFT_CARP) 827 return (EEXIST); 828 else 829 return (0); 830 } 831 } 832 833 /* 834 * No-one seem to have this prefix route, so we try to insert it. 835 */ 836 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 837 if (!error) 838 target->ia_flags |= IFA_ROUTE; 839 return error; 840 } 841 842 /* 843 * If there is no other address in the system that can serve a route to the 844 * same prefix, remove the route. Hand over the route to the new address 845 * otherwise. 846 */ 847 static int 848 in_scrubprefix(target) 849 struct in_ifaddr *target; 850 { 851 struct in_ifaddr *ia; 852 struct in_addr prefix, mask, p; 853 int error; 854 855 if ((target->ia_flags & IFA_ROUTE) == 0) 856 return 0; 857 858 if (rtinitflags(target)) 859 prefix = target->ia_dstaddr.sin_addr; 860 else { 861 prefix = target->ia_addr.sin_addr; 862 mask = target->ia_sockmask.sin_addr; 863 prefix.s_addr &= mask.s_addr; 864 } 865 866 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 867 if (rtinitflags(ia)) 868 p = ia->ia_dstaddr.sin_addr; 869 else { 870 p = ia->ia_addr.sin_addr; 871 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 872 } 873 874 if (prefix.s_addr != p.s_addr) 875 continue; 876 877 /* 878 * If we got a matching prefix address, move IFA_ROUTE and 879 * the route itself to it. Make sure that routing daemons 880 * get a heads-up. 881 * 882 * XXX: a special case for carp(4) interface 883 */ 884 if ((ia->ia_flags & IFA_ROUTE) == 0 885 #ifdef DEV_CARP 886 && (ia->ia_ifp->if_type != IFT_CARP) 887 #endif 888 ) { 889 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 890 rtinitflags(target)); 891 target->ia_flags &= ~IFA_ROUTE; 892 893 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 894 rtinitflags(ia) | RTF_UP); 895 if (error == 0) 896 ia->ia_flags |= IFA_ROUTE; 897 return error; 898 } 899 } 900 901 /* 902 * As no-one seem to have this prefix, we can remove the route. 903 */ 904 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 905 target->ia_flags &= ~IFA_ROUTE; 906 return 0; 907 } 908 909 #undef rtinitflags 910 911 /* 912 * Return 1 if the address might be a local broadcast address. 913 */ 914 int 915 in_broadcast(in, ifp) 916 struct in_addr in; 917 struct ifnet *ifp; 918 { 919 register struct ifaddr *ifa; 920 u_long t; 921 922 if (in.s_addr == INADDR_BROADCAST || 923 in.s_addr == INADDR_ANY) 924 return 1; 925 if ((ifp->if_flags & IFF_BROADCAST) == 0) 926 return 0; 927 t = ntohl(in.s_addr); 928 /* 929 * Look through the list of addresses for a match 930 * with a broadcast address. 931 */ 932 #define ia ((struct in_ifaddr *)ifa) 933 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 934 if (ifa->ifa_addr->sa_family == AF_INET && 935 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 936 in.s_addr == ia->ia_netbroadcast.s_addr || 937 /* 938 * Check for old-style (host 0) broadcast. 939 */ 940 t == ia->ia_subnet || t == ia->ia_net) && 941 /* 942 * Check for an all one subnetmask. These 943 * only exist when an interface gets a secondary 944 * address. 945 */ 946 ia->ia_subnetmask != (u_long)0xffffffff) 947 return 1; 948 return (0); 949 #undef ia 950 } 951 /* 952 * Add an address to the list of IP multicast addresses for a given interface. 953 */ 954 struct in_multi * 955 in_addmulti(ap, ifp) 956 register struct in_addr *ap; 957 register struct ifnet *ifp; 958 { 959 register struct in_multi *inm; 960 int error; 961 struct sockaddr_in sin; 962 struct ifmultiaddr *ifma; 963 964 IFF_LOCKGIANT(ifp); 965 IN_MULTI_LOCK(); 966 /* 967 * Call generic routine to add membership or increment 968 * refcount. It wants addresses in the form of a sockaddr, 969 * so we build one here (being careful to zero the unused bytes). 970 */ 971 bzero(&sin, sizeof sin); 972 sin.sin_family = AF_INET; 973 sin.sin_len = sizeof sin; 974 sin.sin_addr = *ap; 975 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 976 if (error) { 977 IN_MULTI_UNLOCK(); 978 IFF_UNLOCKGIANT(ifp); 979 return 0; 980 } 981 982 /* 983 * If ifma->ifma_protospec is null, then if_addmulti() created 984 * a new record. Otherwise, we are done. 985 */ 986 if (ifma->ifma_protospec != NULL) { 987 IN_MULTI_UNLOCK(); 988 IFF_UNLOCKGIANT(ifp); 989 return ifma->ifma_protospec; 990 } 991 992 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, 993 M_NOWAIT | M_ZERO); 994 if (inm == NULL) { 995 IN_MULTI_UNLOCK(); 996 IFF_UNLOCKGIANT(ifp); 997 return (NULL); 998 } 999 1000 inm->inm_addr = *ap; 1001 inm->inm_ifp = ifp; 1002 inm->inm_ifma = ifma; 1003 ifma->ifma_protospec = inm; 1004 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1005 1006 /* 1007 * Let IGMP know that we have joined a new IP multicast group. 1008 */ 1009 igmp_joingroup(inm); 1010 IN_MULTI_UNLOCK(); 1011 IFF_UNLOCKGIANT(ifp); 1012 return (inm); 1013 } 1014 1015 /* 1016 * Delete a multicast address record. 1017 */ 1018 void 1019 in_delmulti(inm) 1020 register struct in_multi *inm; 1021 { 1022 struct ifmultiaddr *ifma; 1023 struct in_multi my_inm; 1024 struct ifnet *ifp; 1025 1026 ifp = inm->inm_ifp; 1027 IFF_LOCKGIANT(ifp); 1028 IN_MULTI_LOCK(); 1029 ifma = inm->inm_ifma; 1030 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1031 if (ifma->ifma_refcount == 1) { 1032 /* 1033 * No remaining claims to this record; let IGMP know that 1034 * we are leaving the multicast group. 1035 * But do it after the if_delmulti() which might reset 1036 * the interface and nuke the packet. 1037 */ 1038 my_inm = *inm ; 1039 ifma->ifma_protospec = NULL; 1040 LIST_REMOVE(inm, inm_link); 1041 free(inm, M_IPMADDR); 1042 } 1043 /* XXX - should be separate API for when we have an ifma? */ 1044 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1045 if (my_inm.inm_ifp != NULL) 1046 igmp_leavegroup(&my_inm); 1047 IN_MULTI_UNLOCK(); 1048 IFF_UNLOCKGIANT(ifp); 1049 } 1050 1051 /* 1052 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1053 */ 1054 void 1055 in_ifdetach(ifp) 1056 struct ifnet *ifp; 1057 { 1058 1059 in_pcbpurgeif0(&ripcbinfo, ifp); 1060 in_pcbpurgeif0(&udbinfo, ifp); 1061 }
Cache object: f1ee4e2694d9a61ce87cae259d9f40f8
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