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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)in.c 8.4 (Berkeley) 1/9/95 34 * $FreeBSD: releng/5.0/sys/netinet/in.c 105748 2002-10-22 22:50:38Z suz $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/sockio.h> 40 #include <sys/malloc.h> 41 #include <sys/socket.h> 42 #include <sys/kernel.h> 43 #include <sys/sysctl.h> 44 45 #include <net/if.h> 46 #include <net/if_types.h> 47 #include <net/route.h> 48 49 #include <netinet/in.h> 50 #include <netinet/in_var.h> 51 #include <netinet/in_pcb.h> 52 53 #include <netinet/igmp_var.h> 54 55 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 56 57 static int in_mask2len(struct in_addr *); 58 static void in_len2mask(struct in_addr *, int); 59 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 60 struct ifnet *, struct thread *); 61 62 static void in_socktrim(struct sockaddr_in *); 63 static int in_ifinit(struct ifnet *, 64 struct in_ifaddr *, struct sockaddr_in *, int); 65 66 static int subnetsarelocal = 0; 67 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 68 &subnetsarelocal, 0, ""); 69 70 struct in_multihead in_multihead; /* XXX BSS initialization */ 71 72 extern struct inpcbinfo ripcbinfo; 73 extern struct inpcbinfo udbinfo; 74 75 /* 76 * Return 1 if an internet address is for a ``local'' host 77 * (one to which we have a connection). If subnetsarelocal 78 * is true, this includes other subnets of the local net. 79 * Otherwise, it includes only the directly-connected (sub)nets. 80 */ 81 int 82 in_localaddr(in) 83 struct in_addr in; 84 { 85 register u_long i = ntohl(in.s_addr); 86 register struct in_ifaddr *ia; 87 88 if (subnetsarelocal) { 89 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 90 if ((i & ia->ia_netmask) == ia->ia_net) 91 return (1); 92 } else { 93 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 94 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 95 return (1); 96 } 97 return (0); 98 } 99 100 /* 101 * Determine whether an IP address is in a reserved set of addresses 102 * that may not be forwarded, or whether datagrams to that destination 103 * may be forwarded. 104 */ 105 int 106 in_canforward(in) 107 struct in_addr in; 108 { 109 register u_long i = ntohl(in.s_addr); 110 register u_long net; 111 112 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 113 return (0); 114 if (IN_CLASSA(i)) { 115 net = i & IN_CLASSA_NET; 116 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 117 return (0); 118 } 119 return (1); 120 } 121 122 /* 123 * Trim a mask in a sockaddr 124 */ 125 static void 126 in_socktrim(ap) 127 struct sockaddr_in *ap; 128 { 129 register char *cplim = (char *) &ap->sin_addr; 130 register char *cp = (char *) (&ap->sin_addr + 1); 131 132 ap->sin_len = 0; 133 while (--cp >= cplim) 134 if (*cp) { 135 (ap)->sin_len = cp - (char *) (ap) + 1; 136 break; 137 } 138 } 139 140 static int 141 in_mask2len(mask) 142 struct in_addr *mask; 143 { 144 int x, y; 145 u_char *p; 146 147 p = (u_char *)mask; 148 for (x = 0; x < sizeof(*mask); x++) { 149 if (p[x] != 0xff) 150 break; 151 } 152 y = 0; 153 if (x < sizeof(*mask)) { 154 for (y = 0; y < 8; y++) { 155 if ((p[x] & (0x80 >> y)) == 0) 156 break; 157 } 158 } 159 return x * 8 + y; 160 } 161 162 static void 163 in_len2mask(mask, len) 164 struct in_addr *mask; 165 int len; 166 { 167 int i; 168 u_char *p; 169 170 p = (u_char *)mask; 171 bzero(mask, sizeof(*mask)); 172 for (i = 0; i < len / 8; i++) 173 p[i] = 0xff; 174 if (len % 8) 175 p[i] = (0xff00 >> (len % 8)) & 0xff; 176 } 177 178 static int in_interfaces; /* number of external internet interfaces */ 179 180 /* 181 * Generic internet control operations (ioctl's). 182 * Ifp is 0 if not an interface-specific ioctl. 183 */ 184 /* ARGSUSED */ 185 int 186 in_control(so, cmd, data, ifp, td) 187 struct socket *so; 188 u_long cmd; 189 caddr_t data; 190 register struct ifnet *ifp; 191 struct thread *td; 192 { 193 register struct ifreq *ifr = (struct ifreq *)data; 194 register struct in_ifaddr *ia = 0, *iap; 195 register struct ifaddr *ifa; 196 struct in_addr dst; 197 struct in_ifaddr *oia; 198 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 199 struct sockaddr_in oldaddr; 200 int error, hostIsNew, iaIsNew, maskIsNew, s; 201 202 iaIsNew = 0; 203 204 switch (cmd) { 205 case SIOCALIFADDR: 206 case SIOCDLIFADDR: 207 if (td && (error = suser(td)) != 0) 208 return error; 209 /*fall through*/ 210 case SIOCGLIFADDR: 211 if (!ifp) 212 return EINVAL; 213 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 214 } 215 216 /* 217 * Find address for this interface, if it exists. 218 * 219 * If an alias address was specified, find that one instead of 220 * the first one on the interface, if possible. 221 */ 222 if (ifp) { 223 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 224 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 225 if (iap->ia_ifp == ifp && 226 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 227 ia = iap; 228 break; 229 } 230 if (ia == NULL) 231 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 232 iap = ifatoia(ifa); 233 if (iap->ia_addr.sin_family == AF_INET) { 234 ia = iap; 235 break; 236 } 237 } 238 } 239 240 switch (cmd) { 241 242 case SIOCAIFADDR: 243 case SIOCDIFADDR: 244 if (ifp == 0) 245 return (EADDRNOTAVAIL); 246 if (ifra->ifra_addr.sin_family == AF_INET) { 247 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 248 if (ia->ia_ifp == ifp && 249 ia->ia_addr.sin_addr.s_addr == 250 ifra->ifra_addr.sin_addr.s_addr) 251 break; 252 } 253 if ((ifp->if_flags & IFF_POINTOPOINT) 254 && (cmd == SIOCAIFADDR) 255 && (ifra->ifra_dstaddr.sin_addr.s_addr 256 == INADDR_ANY)) { 257 return EDESTADDRREQ; 258 } 259 } 260 if (cmd == SIOCDIFADDR && ia == 0) 261 return (EADDRNOTAVAIL); 262 /* FALLTHROUGH */ 263 case SIOCSIFADDR: 264 case SIOCSIFNETMASK: 265 case SIOCSIFDSTADDR: 266 if (td && (error = suser(td)) != 0) 267 return error; 268 269 if (ifp == 0) 270 return (EADDRNOTAVAIL); 271 if (ia == (struct in_ifaddr *)0) { 272 ia = (struct in_ifaddr *) 273 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 274 if (ia == (struct in_ifaddr *)NULL) 275 return (ENOBUFS); 276 /* 277 * Protect from ipintr() traversing address list 278 * while we're modifying it. 279 */ 280 s = splnet(); 281 282 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 283 ifa = &ia->ia_ifa; 284 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 285 286 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 287 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 288 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 289 ia->ia_sockmask.sin_len = 8; 290 ia->ia_sockmask.sin_family = AF_INET; 291 if (ifp->if_flags & IFF_BROADCAST) { 292 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 293 ia->ia_broadaddr.sin_family = AF_INET; 294 } 295 ia->ia_ifp = ifp; 296 if (!(ifp->if_flags & IFF_LOOPBACK)) 297 in_interfaces++; 298 splx(s); 299 iaIsNew = 1; 300 } 301 break; 302 303 case SIOCSIFBRDADDR: 304 if (td && (error = suser(td)) != 0) 305 return error; 306 /* FALLTHROUGH */ 307 308 case SIOCGIFADDR: 309 case SIOCGIFNETMASK: 310 case SIOCGIFDSTADDR: 311 case SIOCGIFBRDADDR: 312 if (ia == (struct in_ifaddr *)0) 313 return (EADDRNOTAVAIL); 314 break; 315 } 316 switch (cmd) { 317 318 case SIOCGIFADDR: 319 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 320 return (0); 321 322 case SIOCGIFBRDADDR: 323 if ((ifp->if_flags & IFF_BROADCAST) == 0) 324 return (EINVAL); 325 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 326 return (0); 327 328 case SIOCGIFDSTADDR: 329 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 330 return (EINVAL); 331 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 332 return (0); 333 334 case SIOCGIFNETMASK: 335 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 336 return (0); 337 338 case SIOCSIFDSTADDR: 339 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 340 return (EINVAL); 341 oldaddr = ia->ia_dstaddr; 342 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 343 if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 344 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 345 ia->ia_dstaddr = oldaddr; 346 return (error); 347 } 348 if (ia->ia_flags & IFA_ROUTE) { 349 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 350 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 351 ia->ia_ifa.ifa_dstaddr = 352 (struct sockaddr *)&ia->ia_dstaddr; 353 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 354 } 355 return (0); 356 357 case SIOCSIFBRDADDR: 358 if ((ifp->if_flags & IFF_BROADCAST) == 0) 359 return (EINVAL); 360 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 361 return (0); 362 363 case SIOCSIFADDR: 364 error = in_ifinit(ifp, ia, 365 (struct sockaddr_in *) &ifr->ifr_addr, 1); 366 if (error != 0 && iaIsNew) 367 break; 368 return (0); 369 370 case SIOCSIFNETMASK: 371 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 372 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 373 return (0); 374 375 case SIOCAIFADDR: 376 maskIsNew = 0; 377 hostIsNew = 1; 378 error = 0; 379 if (ia->ia_addr.sin_family == AF_INET) { 380 if (ifra->ifra_addr.sin_len == 0) { 381 ifra->ifra_addr = ia->ia_addr; 382 hostIsNew = 0; 383 } else if (ifra->ifra_addr.sin_addr.s_addr == 384 ia->ia_addr.sin_addr.s_addr) 385 hostIsNew = 0; 386 } 387 if (ifra->ifra_mask.sin_len) { 388 in_ifscrub(ifp, ia); 389 ia->ia_sockmask = ifra->ifra_mask; 390 ia->ia_sockmask.sin_family = AF_INET; 391 ia->ia_subnetmask = 392 ntohl(ia->ia_sockmask.sin_addr.s_addr); 393 maskIsNew = 1; 394 } 395 if ((ifp->if_flags & IFF_POINTOPOINT) && 396 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 397 in_ifscrub(ifp, ia); 398 ia->ia_dstaddr = ifra->ifra_dstaddr; 399 maskIsNew = 1; /* We lie; but the effect's the same */ 400 } 401 if (ifra->ifra_addr.sin_family == AF_INET && 402 (hostIsNew || maskIsNew)) 403 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 404 if (error != 0 && iaIsNew) 405 break; 406 407 if ((ifp->if_flags & IFF_BROADCAST) && 408 (ifra->ifra_broadaddr.sin_family == AF_INET)) 409 ia->ia_broadaddr = ifra->ifra_broadaddr; 410 return (error); 411 412 case SIOCDIFADDR: 413 /* 414 * in_ifscrub kills the interface route. 415 */ 416 in_ifscrub(ifp, ia); 417 /* 418 * in_ifadown gets rid of all the rest of 419 * the routes. This is not quite the right 420 * thing to do, but at least if we are running 421 * a routing process they will come back. 422 */ 423 in_ifadown(&ia->ia_ifa, 1); 424 /* 425 * XXX horrible hack to detect that we are being called 426 * from if_detach() 427 */ 428 if (ifaddr_byindex(ifp->if_index) != NULL) { 429 in_pcbpurgeif0(&ripcbinfo, ifp); 430 in_pcbpurgeif0(&udbinfo, ifp); 431 } 432 error = 0; 433 break; 434 435 default: 436 if (ifp == 0 || ifp->if_ioctl == 0) 437 return (EOPNOTSUPP); 438 return ((*ifp->if_ioctl)(ifp, cmd, data)); 439 } 440 441 /* 442 * Protect from ipintr() traversing address list while we're modifying 443 * it. 444 */ 445 s = splnet(); 446 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 447 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 448 LIST_REMOVE(ia, ia_hash); 449 IFAFREE(&ia->ia_ifa); 450 splx(s); 451 452 return (error); 453 } 454 455 /* 456 * SIOC[GAD]LIFADDR. 457 * SIOCGLIFADDR: get first address. (?!?) 458 * SIOCGLIFADDR with IFLR_PREFIX: 459 * get first address that matches the specified prefix. 460 * SIOCALIFADDR: add the specified address. 461 * SIOCALIFADDR with IFLR_PREFIX: 462 * EINVAL since we can't deduce hostid part of the address. 463 * SIOCDLIFADDR: delete the specified address. 464 * SIOCDLIFADDR with IFLR_PREFIX: 465 * delete the first address that matches the specified prefix. 466 * return values: 467 * EINVAL on invalid parameters 468 * EADDRNOTAVAIL on prefix match failed/specified address not found 469 * other values may be returned from in_ioctl() 470 */ 471 static int 472 in_lifaddr_ioctl(so, cmd, data, ifp, td) 473 struct socket *so; 474 u_long cmd; 475 caddr_t data; 476 struct ifnet *ifp; 477 struct thread *td; 478 { 479 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 480 struct ifaddr *ifa; 481 482 /* sanity checks */ 483 if (!data || !ifp) { 484 panic("invalid argument to in_lifaddr_ioctl"); 485 /*NOTRECHED*/ 486 } 487 488 switch (cmd) { 489 case SIOCGLIFADDR: 490 /* address must be specified on GET with IFLR_PREFIX */ 491 if ((iflr->flags & IFLR_PREFIX) == 0) 492 break; 493 /*FALLTHROUGH*/ 494 case SIOCALIFADDR: 495 case SIOCDLIFADDR: 496 /* address must be specified on ADD and DELETE */ 497 if (iflr->addr.ss_family != AF_INET) 498 return EINVAL; 499 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 500 return EINVAL; 501 /* XXX need improvement */ 502 if (iflr->dstaddr.ss_family 503 && iflr->dstaddr.ss_family != AF_INET) 504 return EINVAL; 505 if (iflr->dstaddr.ss_family 506 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 507 return EINVAL; 508 break; 509 default: /*shouldn't happen*/ 510 return EOPNOTSUPP; 511 } 512 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 513 return EINVAL; 514 515 switch (cmd) { 516 case SIOCALIFADDR: 517 { 518 struct in_aliasreq ifra; 519 520 if (iflr->flags & IFLR_PREFIX) 521 return EINVAL; 522 523 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 524 bzero(&ifra, sizeof(ifra)); 525 bcopy(iflr->iflr_name, ifra.ifra_name, 526 sizeof(ifra.ifra_name)); 527 528 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 529 530 if (iflr->dstaddr.ss_family) { /*XXX*/ 531 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 532 iflr->dstaddr.ss_len); 533 } 534 535 ifra.ifra_mask.sin_family = AF_INET; 536 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 537 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 538 539 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 540 } 541 case SIOCGLIFADDR: 542 case SIOCDLIFADDR: 543 { 544 struct in_ifaddr *ia; 545 struct in_addr mask, candidate, match; 546 struct sockaddr_in *sin; 547 int cmp; 548 549 bzero(&mask, sizeof(mask)); 550 if (iflr->flags & IFLR_PREFIX) { 551 /* lookup a prefix rather than address. */ 552 in_len2mask(&mask, iflr->prefixlen); 553 554 sin = (struct sockaddr_in *)&iflr->addr; 555 match.s_addr = sin->sin_addr.s_addr; 556 match.s_addr &= mask.s_addr; 557 558 /* if you set extra bits, that's wrong */ 559 if (match.s_addr != sin->sin_addr.s_addr) 560 return EINVAL; 561 562 cmp = 1; 563 } else { 564 if (cmd == SIOCGLIFADDR) { 565 /* on getting an address, take the 1st match */ 566 cmp = 0; /*XXX*/ 567 } else { 568 /* on deleting an address, do exact match */ 569 in_len2mask(&mask, 32); 570 sin = (struct sockaddr_in *)&iflr->addr; 571 match.s_addr = sin->sin_addr.s_addr; 572 573 cmp = 1; 574 } 575 } 576 577 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 578 if (ifa->ifa_addr->sa_family != AF_INET6) 579 continue; 580 if (!cmp) 581 break; 582 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 583 candidate.s_addr &= mask.s_addr; 584 if (candidate.s_addr == match.s_addr) 585 break; 586 } 587 if (!ifa) 588 return EADDRNOTAVAIL; 589 ia = (struct in_ifaddr *)ifa; 590 591 if (cmd == SIOCGLIFADDR) { 592 /* fill in the if_laddrreq structure */ 593 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 594 595 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 596 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 597 ia->ia_dstaddr.sin_len); 598 } else 599 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 600 601 iflr->prefixlen = 602 in_mask2len(&ia->ia_sockmask.sin_addr); 603 604 iflr->flags = 0; /*XXX*/ 605 606 return 0; 607 } else { 608 struct in_aliasreq ifra; 609 610 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 611 bzero(&ifra, sizeof(ifra)); 612 bcopy(iflr->iflr_name, ifra.ifra_name, 613 sizeof(ifra.ifra_name)); 614 615 bcopy(&ia->ia_addr, &ifra.ifra_addr, 616 ia->ia_addr.sin_len); 617 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 618 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 619 ia->ia_dstaddr.sin_len); 620 } 621 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 622 ia->ia_sockmask.sin_len); 623 624 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 625 ifp, td); 626 } 627 } 628 } 629 630 return EOPNOTSUPP; /*just for safety*/ 631 } 632 633 /* 634 * Delete any existing route for an interface. 635 */ 636 void 637 in_ifscrub(ifp, ia) 638 register struct ifnet *ifp; 639 register struct in_ifaddr *ia; 640 { 641 642 if ((ia->ia_flags & IFA_ROUTE) == 0) 643 return; 644 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 645 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 646 else 647 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 648 ia->ia_flags &= ~IFA_ROUTE; 649 } 650 651 /* 652 * Initialize an interface's internet address 653 * and routing table entry. 654 */ 655 static int 656 in_ifinit(ifp, ia, sin, scrub) 657 register struct ifnet *ifp; 658 register struct in_ifaddr *ia; 659 struct sockaddr_in *sin; 660 int scrub; 661 { 662 register u_long i = ntohl(sin->sin_addr.s_addr); 663 struct sockaddr_in oldaddr; 664 int s = splimp(), flags = RTF_UP, error = 0; 665 666 oldaddr = ia->ia_addr; 667 if (oldaddr.sin_family == AF_INET) 668 LIST_REMOVE(ia, ia_hash); 669 ia->ia_addr = *sin; 670 if (ia->ia_addr.sin_family == AF_INET) 671 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 672 ia, ia_hash); 673 /* 674 * Give the interface a chance to initialize 675 * if this is its first address, 676 * and to validate the address if necessary. 677 */ 678 if (ifp->if_ioctl && 679 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 680 splx(s); 681 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 682 ia->ia_addr = oldaddr; 683 if (ia->ia_addr.sin_family == AF_INET) 684 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 685 ia, ia_hash); 686 return (error); 687 } 688 splx(s); 689 if (scrub) { 690 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 691 in_ifscrub(ifp, ia); 692 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 693 } 694 if (IN_CLASSA(i)) 695 ia->ia_netmask = IN_CLASSA_NET; 696 else if (IN_CLASSB(i)) 697 ia->ia_netmask = IN_CLASSB_NET; 698 else 699 ia->ia_netmask = IN_CLASSC_NET; 700 /* 701 * The subnet mask usually includes at least the standard network part, 702 * but may may be smaller in the case of supernetting. 703 * If it is set, we believe it. 704 */ 705 if (ia->ia_subnetmask == 0) { 706 ia->ia_subnetmask = ia->ia_netmask; 707 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 708 } else 709 ia->ia_netmask &= ia->ia_subnetmask; 710 ia->ia_net = i & ia->ia_netmask; 711 ia->ia_subnet = i & ia->ia_subnetmask; 712 in_socktrim(&ia->ia_sockmask); 713 /* 714 * Add route for the network. 715 */ 716 ia->ia_ifa.ifa_metric = ifp->if_metric; 717 if (ifp->if_flags & IFF_BROADCAST) { 718 ia->ia_broadaddr.sin_addr.s_addr = 719 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 720 ia->ia_netbroadcast.s_addr = 721 htonl(ia->ia_net | ~ ia->ia_netmask); 722 } else if (ifp->if_flags & IFF_LOOPBACK) { 723 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 724 flags |= RTF_HOST; 725 } else if (ifp->if_flags & IFF_POINTOPOINT) { 726 if (ia->ia_dstaddr.sin_family != AF_INET) 727 return (0); 728 flags |= RTF_HOST; 729 } 730 731 /*- 732 * Don't add host routes for interface addresses of 733 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 734 * possible to assign several such address pairs with consistent 735 * results (no host route) and is required by BOOTP. 736 * 737 * XXX: This is ugly ! There should be a way for the caller to 738 * say that they don't want a host route. 739 */ 740 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 741 ia->ia_netmask != IN_CLASSA_NET || 742 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 743 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 744 ia->ia_addr = oldaddr; 745 return (error); 746 } 747 ia->ia_flags |= IFA_ROUTE; 748 } 749 750 /* 751 * If the interface supports multicast, join the "all hosts" 752 * multicast group on that interface. 753 */ 754 if (ifp->if_flags & IFF_MULTICAST) { 755 struct in_addr addr; 756 757 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 758 in_addmulti(&addr, ifp); 759 } 760 return (error); 761 } 762 763 764 /* 765 * Return 1 if the address might be a local broadcast address. 766 */ 767 int 768 in_broadcast(in, ifp) 769 struct in_addr in; 770 struct ifnet *ifp; 771 { 772 register struct ifaddr *ifa; 773 u_long t; 774 775 if (in.s_addr == INADDR_BROADCAST || 776 in.s_addr == INADDR_ANY) 777 return 1; 778 if ((ifp->if_flags & IFF_BROADCAST) == 0) 779 return 0; 780 t = ntohl(in.s_addr); 781 /* 782 * Look through the list of addresses for a match 783 * with a broadcast address. 784 */ 785 #define ia ((struct in_ifaddr *)ifa) 786 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 787 if (ifa->ifa_addr->sa_family == AF_INET && 788 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 789 in.s_addr == ia->ia_netbroadcast.s_addr || 790 /* 791 * Check for old-style (host 0) broadcast. 792 */ 793 t == ia->ia_subnet || t == ia->ia_net) && 794 /* 795 * Check for an all one subnetmask. These 796 * only exist when an interface gets a secondary 797 * address. 798 */ 799 ia->ia_subnetmask != (u_long)0xffffffff) 800 return 1; 801 return (0); 802 #undef ia 803 } 804 /* 805 * Add an address to the list of IP multicast addresses for a given interface. 806 */ 807 struct in_multi * 808 in_addmulti(ap, ifp) 809 register struct in_addr *ap; 810 register struct ifnet *ifp; 811 { 812 register struct in_multi *inm; 813 int error; 814 struct sockaddr_in sin; 815 struct ifmultiaddr *ifma; 816 int s = splnet(); 817 818 /* 819 * Call generic routine to add membership or increment 820 * refcount. It wants addresses in the form of a sockaddr, 821 * so we build one here (being careful to zero the unused bytes). 822 */ 823 bzero(&sin, sizeof sin); 824 sin.sin_family = AF_INET; 825 sin.sin_len = sizeof sin; 826 sin.sin_addr = *ap; 827 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 828 if (error) { 829 splx(s); 830 return 0; 831 } 832 833 /* 834 * If ifma->ifma_protospec is null, then if_addmulti() created 835 * a new record. Otherwise, we are done. 836 */ 837 if (ifma->ifma_protospec != 0) { 838 splx(s); 839 return ifma->ifma_protospec; 840 } 841 842 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 843 at interrupt time? If so, need to fix if_addmulti. XXX */ 844 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, 845 M_NOWAIT | M_ZERO); 846 if (inm == NULL) { 847 splx(s); 848 return (NULL); 849 } 850 851 inm->inm_addr = *ap; 852 inm->inm_ifp = ifp; 853 inm->inm_ifma = ifma; 854 ifma->ifma_protospec = inm; 855 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 856 857 /* 858 * Let IGMP know that we have joined a new IP multicast group. 859 */ 860 igmp_joingroup(inm); 861 splx(s); 862 return (inm); 863 } 864 865 /* 866 * Delete a multicast address record. 867 */ 868 void 869 in_delmulti(inm) 870 register struct in_multi *inm; 871 { 872 struct ifmultiaddr *ifma = inm->inm_ifma; 873 struct in_multi my_inm; 874 int s = splnet(); 875 876 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 877 if (ifma->ifma_refcount == 1) { 878 /* 879 * No remaining claims to this record; let IGMP know that 880 * we are leaving the multicast group. 881 * But do it after the if_delmulti() which might reset 882 * the interface and nuke the packet. 883 */ 884 my_inm = *inm ; 885 ifma->ifma_protospec = 0; 886 LIST_REMOVE(inm, inm_link); 887 free(inm, M_IPMADDR); 888 } 889 /* XXX - should be separate API for when we have an ifma? */ 890 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 891 if (my_inm.inm_ifp != NULL) 892 igmp_leavegroup(&my_inm); 893 splx(s); 894 }
Cache object: ceb0e30b425891ceef516db9e2c494ea
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