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 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)in.c 8.4 (Berkeley) 1/9/95 30 * $FreeBSD: releng/5.3/sys/netinet/in.c 136588 2004-10-16 08:43:07Z cvs2svn $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/sockio.h> 36 #include <sys/malloc.h> 37 #include <sys/socket.h> 38 #include <sys/kernel.h> 39 #include <sys/sysctl.h> 40 41 #include <net/if.h> 42 #include <net/if_types.h> 43 #include <net/route.h> 44 45 #include <netinet/in.h> 46 #include <netinet/in_var.h> 47 #include <netinet/in_pcb.h> 48 49 #include <netinet/igmp_var.h> 50 51 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 52 53 static int in_mask2len(struct in_addr *); 54 static void in_len2mask(struct in_addr *, int); 55 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 56 struct ifnet *, struct thread *); 57 58 static void in_socktrim(struct sockaddr_in *); 59 static int in_ifinit(struct ifnet *, 60 struct in_ifaddr *, struct sockaddr_in *, int); 61 62 static int subnetsarelocal = 0; 63 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 64 &subnetsarelocal, 0, "Treat all subnets as directly connected"); 65 66 struct in_multihead in_multihead; /* XXX BSS initialization */ 67 68 extern struct inpcbinfo ripcbinfo; 69 extern struct inpcbinfo udbinfo; 70 71 /* 72 * Return 1 if an internet address is for a ``local'' host 73 * (one to which we have a connection). If subnetsarelocal 74 * is true, this includes other subnets of the local net. 75 * Otherwise, it includes only the directly-connected (sub)nets. 76 */ 77 int 78 in_localaddr(in) 79 struct in_addr in; 80 { 81 register u_long i = ntohl(in.s_addr); 82 register struct in_ifaddr *ia; 83 84 if (subnetsarelocal) { 85 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 86 if ((i & ia->ia_netmask) == ia->ia_net) 87 return (1); 88 } else { 89 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 90 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 91 return (1); 92 } 93 return (0); 94 } 95 96 /* 97 * Return 1 if an internet address is for the local host and configured 98 * on one of its interfaces. 99 */ 100 int 101 in_localip(in) 102 struct in_addr in; 103 { 104 struct in_ifaddr *ia; 105 106 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 107 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 108 return 1; 109 } 110 return 0; 111 } 112 113 /* 114 * Determine whether an IP address is in a reserved set of addresses 115 * that may not be forwarded, or whether datagrams to that destination 116 * may be forwarded. 117 */ 118 int 119 in_canforward(in) 120 struct in_addr in; 121 { 122 register u_long i = ntohl(in.s_addr); 123 register u_long net; 124 125 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 126 return (0); 127 if (IN_CLASSA(i)) { 128 net = i & IN_CLASSA_NET; 129 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 130 return (0); 131 } 132 return (1); 133 } 134 135 /* 136 * Trim a mask in a sockaddr 137 */ 138 static void 139 in_socktrim(ap) 140 struct sockaddr_in *ap; 141 { 142 register char *cplim = (char *) &ap->sin_addr; 143 register char *cp = (char *) (&ap->sin_addr + 1); 144 145 ap->sin_len = 0; 146 while (--cp >= cplim) 147 if (*cp) { 148 (ap)->sin_len = cp - (char *) (ap) + 1; 149 break; 150 } 151 } 152 153 static int 154 in_mask2len(mask) 155 struct in_addr *mask; 156 { 157 int x, y; 158 u_char *p; 159 160 p = (u_char *)mask; 161 for (x = 0; x < sizeof(*mask); x++) { 162 if (p[x] != 0xff) 163 break; 164 } 165 y = 0; 166 if (x < sizeof(*mask)) { 167 for (y = 0; y < 8; y++) { 168 if ((p[x] & (0x80 >> y)) == 0) 169 break; 170 } 171 } 172 return x * 8 + y; 173 } 174 175 static void 176 in_len2mask(mask, len) 177 struct in_addr *mask; 178 int len; 179 { 180 int i; 181 u_char *p; 182 183 p = (u_char *)mask; 184 bzero(mask, sizeof(*mask)); 185 for (i = 0; i < len / 8; i++) 186 p[i] = 0xff; 187 if (len % 8) 188 p[i] = (0xff00 >> (len % 8)) & 0xff; 189 } 190 191 /* 192 * Generic internet control operations (ioctl's). 193 * Ifp is 0 if not an interface-specific ioctl. 194 */ 195 /* ARGSUSED */ 196 int 197 in_control(so, cmd, data, ifp, td) 198 struct socket *so; 199 u_long cmd; 200 caddr_t data; 201 register struct ifnet *ifp; 202 struct thread *td; 203 { 204 register struct ifreq *ifr = (struct ifreq *)data; 205 register struct in_ifaddr *ia = 0, *iap; 206 register struct ifaddr *ifa; 207 struct in_addr dst; 208 struct in_ifaddr *oia; 209 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 210 struct sockaddr_in oldaddr; 211 int error, hostIsNew, iaIsNew, maskIsNew, s; 212 213 iaIsNew = 0; 214 215 switch (cmd) { 216 case SIOCALIFADDR: 217 case SIOCDLIFADDR: 218 if (td && (error = suser(td)) != 0) 219 return error; 220 /*fall through*/ 221 case SIOCGLIFADDR: 222 if (!ifp) 223 return EINVAL; 224 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 225 } 226 227 /* 228 * Find address for this interface, if it exists. 229 * 230 * If an alias address was specified, find that one instead of 231 * the first one on the interface, if possible. 232 */ 233 if (ifp) { 234 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 235 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 236 if (iap->ia_ifp == ifp && 237 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 238 ia = iap; 239 break; 240 } 241 if (ia == NULL) 242 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 243 iap = ifatoia(ifa); 244 if (iap->ia_addr.sin_family == AF_INET) { 245 ia = iap; 246 break; 247 } 248 } 249 } 250 251 switch (cmd) { 252 253 case SIOCAIFADDR: 254 case SIOCDIFADDR: 255 if (ifp == 0) 256 return (EADDRNOTAVAIL); 257 if (ifra->ifra_addr.sin_family == AF_INET) { 258 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 259 if (ia->ia_ifp == ifp && 260 ia->ia_addr.sin_addr.s_addr == 261 ifra->ifra_addr.sin_addr.s_addr) 262 break; 263 } 264 if ((ifp->if_flags & IFF_POINTOPOINT) 265 && (cmd == SIOCAIFADDR) 266 && (ifra->ifra_dstaddr.sin_addr.s_addr 267 == INADDR_ANY)) { 268 return EDESTADDRREQ; 269 } 270 } 271 if (cmd == SIOCDIFADDR && ia == 0) 272 return (EADDRNOTAVAIL); 273 /* FALLTHROUGH */ 274 case SIOCSIFADDR: 275 case SIOCSIFNETMASK: 276 case SIOCSIFDSTADDR: 277 if (td && (error = suser(td)) != 0) 278 return error; 279 280 if (ifp == 0) 281 return (EADDRNOTAVAIL); 282 if (ia == (struct in_ifaddr *)0) { 283 ia = (struct in_ifaddr *) 284 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 285 if (ia == (struct in_ifaddr *)NULL) 286 return (ENOBUFS); 287 /* 288 * Protect from ipintr() traversing address list 289 * while we're modifying it. 290 */ 291 s = splnet(); 292 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 293 294 ifa = &ia->ia_ifa; 295 IFA_LOCK_INIT(ifa); 296 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 297 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 298 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 299 ifa->ifa_refcnt = 1; 300 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 301 302 ia->ia_sockmask.sin_len = 8; 303 ia->ia_sockmask.sin_family = AF_INET; 304 if (ifp->if_flags & IFF_BROADCAST) { 305 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 306 ia->ia_broadaddr.sin_family = AF_INET; 307 } 308 ia->ia_ifp = ifp; 309 splx(s); 310 iaIsNew = 1; 311 } 312 break; 313 314 case SIOCSIFBRDADDR: 315 if (td && (error = suser(td)) != 0) 316 return error; 317 /* FALLTHROUGH */ 318 319 case SIOCGIFADDR: 320 case SIOCGIFNETMASK: 321 case SIOCGIFDSTADDR: 322 case SIOCGIFBRDADDR: 323 if (ia == (struct in_ifaddr *)0) 324 return (EADDRNOTAVAIL); 325 break; 326 } 327 switch (cmd) { 328 329 case SIOCGIFADDR: 330 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 331 return (0); 332 333 case SIOCGIFBRDADDR: 334 if ((ifp->if_flags & IFF_BROADCAST) == 0) 335 return (EINVAL); 336 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 337 return (0); 338 339 case SIOCGIFDSTADDR: 340 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 341 return (EINVAL); 342 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 343 return (0); 344 345 case SIOCGIFNETMASK: 346 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 347 return (0); 348 349 case SIOCSIFDSTADDR: 350 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 351 return (EINVAL); 352 oldaddr = ia->ia_dstaddr; 353 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 354 if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 355 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 356 ia->ia_dstaddr = oldaddr; 357 return (error); 358 } 359 if (ia->ia_flags & IFA_ROUTE) { 360 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 361 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 362 ia->ia_ifa.ifa_dstaddr = 363 (struct sockaddr *)&ia->ia_dstaddr; 364 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 365 } 366 return (0); 367 368 case SIOCSIFBRDADDR: 369 if ((ifp->if_flags & IFF_BROADCAST) == 0) 370 return (EINVAL); 371 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 372 return (0); 373 374 case SIOCSIFADDR: 375 error = in_ifinit(ifp, ia, 376 (struct sockaddr_in *) &ifr->ifr_addr, 1); 377 if (error != 0 && iaIsNew) 378 break; 379 if (error == 0) 380 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 381 return (0); 382 383 case SIOCSIFNETMASK: 384 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 385 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 386 return (0); 387 388 case SIOCAIFADDR: 389 maskIsNew = 0; 390 hostIsNew = 1; 391 error = 0; 392 if (ia->ia_addr.sin_family == AF_INET) { 393 if (ifra->ifra_addr.sin_len == 0) { 394 ifra->ifra_addr = ia->ia_addr; 395 hostIsNew = 0; 396 } else if (ifra->ifra_addr.sin_addr.s_addr == 397 ia->ia_addr.sin_addr.s_addr) 398 hostIsNew = 0; 399 } 400 if (ifra->ifra_mask.sin_len) { 401 in_ifscrub(ifp, ia); 402 ia->ia_sockmask = ifra->ifra_mask; 403 ia->ia_sockmask.sin_family = AF_INET; 404 ia->ia_subnetmask = 405 ntohl(ia->ia_sockmask.sin_addr.s_addr); 406 maskIsNew = 1; 407 } 408 if ((ifp->if_flags & IFF_POINTOPOINT) && 409 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 410 in_ifscrub(ifp, ia); 411 ia->ia_dstaddr = ifra->ifra_dstaddr; 412 maskIsNew = 1; /* We lie; but the effect's the same */ 413 } 414 if (ifra->ifra_addr.sin_family == AF_INET && 415 (hostIsNew || maskIsNew)) 416 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 417 if (error != 0 && iaIsNew) 418 break; 419 420 if ((ifp->if_flags & IFF_BROADCAST) && 421 (ifra->ifra_broadaddr.sin_family == AF_INET)) 422 ia->ia_broadaddr = ifra->ifra_broadaddr; 423 if (error == 0) 424 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 425 return (error); 426 427 case SIOCDIFADDR: 428 /* 429 * in_ifscrub kills the interface route. 430 */ 431 in_ifscrub(ifp, ia); 432 /* 433 * in_ifadown gets rid of all the rest of 434 * the routes. This is not quite the right 435 * thing to do, but at least if we are running 436 * a routing process they will come back. 437 */ 438 in_ifadown(&ia->ia_ifa, 1); 439 /* 440 * XXX horrible hack to detect that we are being called 441 * from if_detach() 442 */ 443 if (ifaddr_byindex(ifp->if_index) == NULL) { 444 in_pcbpurgeif0(&ripcbinfo, ifp); 445 in_pcbpurgeif0(&udbinfo, ifp); 446 } 447 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 448 error = 0; 449 break; 450 451 default: 452 if (ifp == 0 || ifp->if_ioctl == 0) 453 return (EOPNOTSUPP); 454 return ((*ifp->if_ioctl)(ifp, cmd, data)); 455 } 456 457 /* 458 * Protect from ipintr() traversing address list while we're modifying 459 * it. 460 */ 461 s = splnet(); 462 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 463 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 464 LIST_REMOVE(ia, ia_hash); 465 IFAFREE(&ia->ia_ifa); 466 splx(s); 467 468 return (error); 469 } 470 471 /* 472 * SIOC[GAD]LIFADDR. 473 * SIOCGLIFADDR: get first address. (?!?) 474 * SIOCGLIFADDR with IFLR_PREFIX: 475 * get first address that matches the specified prefix. 476 * SIOCALIFADDR: add the specified address. 477 * SIOCALIFADDR with IFLR_PREFIX: 478 * EINVAL since we can't deduce hostid part of the address. 479 * SIOCDLIFADDR: delete the specified address. 480 * SIOCDLIFADDR with IFLR_PREFIX: 481 * delete the first address that matches the specified prefix. 482 * return values: 483 * EINVAL on invalid parameters 484 * EADDRNOTAVAIL on prefix match failed/specified address not found 485 * other values may be returned from in_ioctl() 486 */ 487 static int 488 in_lifaddr_ioctl(so, cmd, data, ifp, td) 489 struct socket *so; 490 u_long cmd; 491 caddr_t data; 492 struct ifnet *ifp; 493 struct thread *td; 494 { 495 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 496 struct ifaddr *ifa; 497 498 /* sanity checks */ 499 if (!data || !ifp) { 500 panic("invalid argument to in_lifaddr_ioctl"); 501 /*NOTRECHED*/ 502 } 503 504 switch (cmd) { 505 case SIOCGLIFADDR: 506 /* address must be specified on GET with IFLR_PREFIX */ 507 if ((iflr->flags & IFLR_PREFIX) == 0) 508 break; 509 /*FALLTHROUGH*/ 510 case SIOCALIFADDR: 511 case SIOCDLIFADDR: 512 /* address must be specified on ADD and DELETE */ 513 if (iflr->addr.ss_family != AF_INET) 514 return EINVAL; 515 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 516 return EINVAL; 517 /* XXX need improvement */ 518 if (iflr->dstaddr.ss_family 519 && iflr->dstaddr.ss_family != AF_INET) 520 return EINVAL; 521 if (iflr->dstaddr.ss_family 522 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 523 return EINVAL; 524 break; 525 default: /*shouldn't happen*/ 526 return EOPNOTSUPP; 527 } 528 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 529 return EINVAL; 530 531 switch (cmd) { 532 case SIOCALIFADDR: 533 { 534 struct in_aliasreq ifra; 535 536 if (iflr->flags & IFLR_PREFIX) 537 return EINVAL; 538 539 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 540 bzero(&ifra, sizeof(ifra)); 541 bcopy(iflr->iflr_name, ifra.ifra_name, 542 sizeof(ifra.ifra_name)); 543 544 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 545 546 if (iflr->dstaddr.ss_family) { /*XXX*/ 547 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 548 iflr->dstaddr.ss_len); 549 } 550 551 ifra.ifra_mask.sin_family = AF_INET; 552 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 553 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 554 555 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 556 } 557 case SIOCGLIFADDR: 558 case SIOCDLIFADDR: 559 { 560 struct in_ifaddr *ia; 561 struct in_addr mask, candidate, match; 562 struct sockaddr_in *sin; 563 int cmp; 564 565 bzero(&mask, sizeof(mask)); 566 if (iflr->flags & IFLR_PREFIX) { 567 /* lookup a prefix rather than address. */ 568 in_len2mask(&mask, iflr->prefixlen); 569 570 sin = (struct sockaddr_in *)&iflr->addr; 571 match.s_addr = sin->sin_addr.s_addr; 572 match.s_addr &= mask.s_addr; 573 574 /* if you set extra bits, that's wrong */ 575 if (match.s_addr != sin->sin_addr.s_addr) 576 return EINVAL; 577 578 cmp = 1; 579 } else { 580 if (cmd == SIOCGLIFADDR) { 581 /* on getting an address, take the 1st match */ 582 cmp = 0; /*XXX*/ 583 } else { 584 /* on deleting an address, do exact match */ 585 in_len2mask(&mask, 32); 586 sin = (struct sockaddr_in *)&iflr->addr; 587 match.s_addr = sin->sin_addr.s_addr; 588 589 cmp = 1; 590 } 591 } 592 593 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 594 if (ifa->ifa_addr->sa_family != AF_INET6) 595 continue; 596 if (!cmp) 597 break; 598 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 599 candidate.s_addr &= mask.s_addr; 600 if (candidate.s_addr == match.s_addr) 601 break; 602 } 603 if (!ifa) 604 return EADDRNOTAVAIL; 605 ia = (struct in_ifaddr *)ifa; 606 607 if (cmd == SIOCGLIFADDR) { 608 /* fill in the if_laddrreq structure */ 609 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 610 611 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 612 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 613 ia->ia_dstaddr.sin_len); 614 } else 615 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 616 617 iflr->prefixlen = 618 in_mask2len(&ia->ia_sockmask.sin_addr); 619 620 iflr->flags = 0; /*XXX*/ 621 622 return 0; 623 } else { 624 struct in_aliasreq ifra; 625 626 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 627 bzero(&ifra, sizeof(ifra)); 628 bcopy(iflr->iflr_name, ifra.ifra_name, 629 sizeof(ifra.ifra_name)); 630 631 bcopy(&ia->ia_addr, &ifra.ifra_addr, 632 ia->ia_addr.sin_len); 633 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 634 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 635 ia->ia_dstaddr.sin_len); 636 } 637 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 638 ia->ia_sockmask.sin_len); 639 640 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 641 ifp, td); 642 } 643 } 644 } 645 646 return EOPNOTSUPP; /*just for safety*/ 647 } 648 649 /* 650 * Delete any existing route for an interface. 651 */ 652 void 653 in_ifscrub(ifp, ia) 654 register struct ifnet *ifp; 655 register struct in_ifaddr *ia; 656 { 657 658 if ((ia->ia_flags & IFA_ROUTE) == 0) 659 return; 660 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 661 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 662 else 663 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 664 ia->ia_flags &= ~IFA_ROUTE; 665 } 666 667 /* 668 * Initialize an interface's internet address 669 * and routing table entry. 670 */ 671 static int 672 in_ifinit(ifp, ia, sin, scrub) 673 register struct ifnet *ifp; 674 register struct in_ifaddr *ia; 675 struct sockaddr_in *sin; 676 int scrub; 677 { 678 register u_long i = ntohl(sin->sin_addr.s_addr); 679 struct sockaddr_in oldaddr; 680 int s = splimp(), flags = RTF_UP, error = 0; 681 682 oldaddr = ia->ia_addr; 683 if (oldaddr.sin_family == AF_INET) 684 LIST_REMOVE(ia, ia_hash); 685 ia->ia_addr = *sin; 686 if (ia->ia_addr.sin_family == AF_INET) 687 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 688 ia, ia_hash); 689 /* 690 * Give the interface a chance to initialize 691 * if this is its first address, 692 * and to validate the address if necessary. 693 */ 694 if (ifp->if_ioctl && 695 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 696 splx(s); 697 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 698 ia->ia_addr = oldaddr; 699 if (ia->ia_addr.sin_family == AF_INET) 700 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 701 ia, ia_hash); 702 return (error); 703 } 704 splx(s); 705 if (scrub) { 706 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 707 in_ifscrub(ifp, ia); 708 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 709 } 710 if (IN_CLASSA(i)) 711 ia->ia_netmask = IN_CLASSA_NET; 712 else if (IN_CLASSB(i)) 713 ia->ia_netmask = IN_CLASSB_NET; 714 else 715 ia->ia_netmask = IN_CLASSC_NET; 716 /* 717 * The subnet mask usually includes at least the standard network part, 718 * but may may be smaller in the case of supernetting. 719 * If it is set, we believe it. 720 */ 721 if (ia->ia_subnetmask == 0) { 722 ia->ia_subnetmask = ia->ia_netmask; 723 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 724 } else 725 ia->ia_netmask &= ia->ia_subnetmask; 726 ia->ia_net = i & ia->ia_netmask; 727 ia->ia_subnet = i & ia->ia_subnetmask; 728 in_socktrim(&ia->ia_sockmask); 729 /* 730 * Add route for the network. 731 */ 732 ia->ia_ifa.ifa_metric = ifp->if_metric; 733 if (ifp->if_flags & IFF_BROADCAST) { 734 ia->ia_broadaddr.sin_addr.s_addr = 735 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 736 ia->ia_netbroadcast.s_addr = 737 htonl(ia->ia_net | ~ ia->ia_netmask); 738 } else if (ifp->if_flags & IFF_LOOPBACK) { 739 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 740 flags |= RTF_HOST; 741 } else if (ifp->if_flags & IFF_POINTOPOINT) { 742 if (ia->ia_dstaddr.sin_family != AF_INET) 743 return (0); 744 flags |= RTF_HOST; 745 } 746 747 /*- 748 * Don't add host routes for interface addresses of 749 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 750 * possible to assign several such address pairs with consistent 751 * results (no host route) and is required by BOOTP. 752 * 753 * XXX: This is ugly ! There should be a way for the caller to 754 * say that they don't want a host route. 755 */ 756 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 757 ia->ia_netmask != IN_CLASSA_NET || 758 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 759 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 760 ia->ia_addr = oldaddr; 761 return (error); 762 } 763 ia->ia_flags |= IFA_ROUTE; 764 } 765 766 /* 767 * If the interface supports multicast, join the "all hosts" 768 * multicast group on that interface. 769 */ 770 if (ifp->if_flags & IFF_MULTICAST) { 771 struct in_addr addr; 772 773 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 774 in_addmulti(&addr, ifp); 775 } 776 return (error); 777 } 778 779 780 /* 781 * Return 1 if the address might be a local broadcast address. 782 */ 783 int 784 in_broadcast(in, ifp) 785 struct in_addr in; 786 struct ifnet *ifp; 787 { 788 register struct ifaddr *ifa; 789 u_long t; 790 791 if (in.s_addr == INADDR_BROADCAST || 792 in.s_addr == INADDR_ANY) 793 return 1; 794 if ((ifp->if_flags & IFF_BROADCAST) == 0) 795 return 0; 796 t = ntohl(in.s_addr); 797 /* 798 * Look through the list of addresses for a match 799 * with a broadcast address. 800 */ 801 #define ia ((struct in_ifaddr *)ifa) 802 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 803 if (ifa->ifa_addr->sa_family == AF_INET && 804 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 805 in.s_addr == ia->ia_netbroadcast.s_addr || 806 /* 807 * Check for old-style (host 0) broadcast. 808 */ 809 t == ia->ia_subnet || t == ia->ia_net) && 810 /* 811 * Check for an all one subnetmask. These 812 * only exist when an interface gets a secondary 813 * address. 814 */ 815 ia->ia_subnetmask != (u_long)0xffffffff) 816 return 1; 817 return (0); 818 #undef ia 819 } 820 /* 821 * Add an address to the list of IP multicast addresses for a given interface. 822 */ 823 struct in_multi * 824 in_addmulti(ap, ifp) 825 register struct in_addr *ap; 826 register struct ifnet *ifp; 827 { 828 register struct in_multi *inm; 829 int error; 830 struct sockaddr_in sin; 831 struct ifmultiaddr *ifma; 832 int s = splnet(); 833 834 /* 835 * Call generic routine to add membership or increment 836 * refcount. It wants addresses in the form of a sockaddr, 837 * so we build one here (being careful to zero the unused bytes). 838 */ 839 bzero(&sin, sizeof sin); 840 sin.sin_family = AF_INET; 841 sin.sin_len = sizeof sin; 842 sin.sin_addr = *ap; 843 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 844 if (error) { 845 splx(s); 846 return 0; 847 } 848 849 /* 850 * If ifma->ifma_protospec is null, then if_addmulti() created 851 * a new record. Otherwise, we are done. 852 */ 853 if (ifma->ifma_protospec != 0) { 854 splx(s); 855 return ifma->ifma_protospec; 856 } 857 858 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 859 at interrupt time? If so, need to fix if_addmulti. XXX */ 860 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, 861 M_NOWAIT | M_ZERO); 862 if (inm == NULL) { 863 splx(s); 864 return (NULL); 865 } 866 867 inm->inm_addr = *ap; 868 inm->inm_ifp = ifp; 869 inm->inm_ifma = ifma; 870 ifma->ifma_protospec = inm; 871 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 872 873 /* 874 * Let IGMP know that we have joined a new IP multicast group. 875 */ 876 igmp_joingroup(inm); 877 splx(s); 878 return (inm); 879 } 880 881 /* 882 * Delete a multicast address record. 883 */ 884 void 885 in_delmulti(inm) 886 register struct in_multi *inm; 887 { 888 struct ifmultiaddr *ifma = inm->inm_ifma; 889 struct in_multi my_inm; 890 int s = splnet(); 891 892 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 893 if (ifma->ifma_refcount == 1) { 894 /* 895 * No remaining claims to this record; let IGMP know that 896 * we are leaving the multicast group. 897 * But do it after the if_delmulti() which might reset 898 * the interface and nuke the packet. 899 */ 900 my_inm = *inm ; 901 ifma->ifma_protospec = 0; 902 LIST_REMOVE(inm, inm_link); 903 free(inm, M_IPMADDR); 904 } 905 /* XXX - should be separate API for when we have an ifma? */ 906 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 907 if (my_inm.inm_ifp != NULL) 908 igmp_leavegroup(&my_inm); 909 splx(s); 910 }
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