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: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $ 35 * $DragonFly: src/sys/netinet/in.c,v 1.4 2003/06/25 03:56:04 dillon Exp $ 36 */ 37 38 #include "opt_bootp.h" 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/sockio.h> 42 #include <sys/malloc.h> 43 #include <sys/proc.h> 44 #include <sys/socket.h> 45 #include <sys/kernel.h> 46 #include <sys/sysctl.h> 47 48 #include <net/if.h> 49 #include <net/if_types.h> 50 #include <net/route.h> 51 52 #include <netinet/in.h> 53 #include <netinet/in_var.h> 54 #include <netinet/in_pcb.h> 55 56 #include <netinet/igmp_var.h> 57 58 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 59 60 static int in_mask2len __P((struct in_addr *)); 61 static void in_len2mask __P((struct in_addr *, int)); 62 static int in_lifaddr_ioctl __P((struct socket *, u_long, caddr_t, 63 struct ifnet *, struct thread *)); 64 65 static void in_socktrim __P((struct sockaddr_in *)); 66 static int in_ifinit __P((struct ifnet *, 67 struct in_ifaddr *, struct sockaddr_in *, int)); 68 69 static int subnetsarelocal = 0; 70 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 71 &subnetsarelocal, 0, ""); 72 73 struct in_multihead in_multihead; /* XXX BSS initialization */ 74 75 extern struct inpcbinfo ripcbinfo; 76 extern struct inpcbinfo udbinfo; 77 78 /* 79 * Return 1 if an internet address is for a ``local'' host 80 * (one to which we have a connection). If subnetsarelocal 81 * is true, this includes other subnets of the local net. 82 * Otherwise, it includes only the directly-connected (sub)nets. 83 */ 84 int 85 in_localaddr(in) 86 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 * Determine whether an IP address is in a reserved set of addresses 105 * that may not be forwarded, or whether datagrams to that destination 106 * may be forwarded. 107 */ 108 int 109 in_canforward(in) 110 struct in_addr in; 111 { 112 register u_long i = ntohl(in.s_addr); 113 register u_long net; 114 115 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 116 return (0); 117 if (IN_CLASSA(i)) { 118 net = i & IN_CLASSA_NET; 119 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 120 return (0); 121 } 122 return (1); 123 } 124 125 /* 126 * Trim a mask in a sockaddr 127 */ 128 static void 129 in_socktrim(ap) 130 struct sockaddr_in *ap; 131 { 132 register char *cplim = (char *) &ap->sin_addr; 133 register char *cp = (char *) (&ap->sin_addr + 1); 134 135 ap->sin_len = 0; 136 while (--cp >= cplim) 137 if (*cp) { 138 (ap)->sin_len = cp - (char *) (ap) + 1; 139 break; 140 } 141 } 142 143 static int 144 in_mask2len(mask) 145 struct in_addr *mask; 146 { 147 int x, y; 148 u_char *p; 149 150 p = (u_char *)mask; 151 for (x = 0; x < sizeof(*mask); x++) { 152 if (p[x] != 0xff) 153 break; 154 } 155 y = 0; 156 if (x < sizeof(*mask)) { 157 for (y = 0; y < 8; y++) { 158 if ((p[x] & (0x80 >> y)) == 0) 159 break; 160 } 161 } 162 return x * 8 + y; 163 } 164 165 static void 166 in_len2mask(mask, len) 167 struct in_addr *mask; 168 int len; 169 { 170 int i; 171 u_char *p; 172 173 p = (u_char *)mask; 174 bzero(mask, sizeof(*mask)); 175 for (i = 0; i < len / 8; i++) 176 p[i] = 0xff; 177 if (len % 8) 178 p[i] = (0xff00 >> (len % 8)) & 0xff; 179 } 180 181 static int in_interfaces; /* number of external internet interfaces */ 182 183 /* 184 * Generic internet control operations (ioctl's). 185 * Ifp is 0 if not an interface-specific ioctl. 186 */ 187 /* ARGSUSED */ 188 int 189 in_control(so, cmd, data, ifp, td) 190 struct socket *so; 191 u_long cmd; 192 caddr_t data; 193 struct ifnet *ifp; 194 struct thread *td; 195 { 196 struct ifreq *ifr = (struct ifreq *)data; 197 struct in_ifaddr *ia = 0, *iap; 198 struct ifaddr *ifa; 199 struct in_addr dst; 200 struct in_ifaddr *oia; 201 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 202 struct sockaddr_in oldaddr; 203 int error, hostIsNew, iaIsNew, maskIsNew, s; 204 205 iaIsNew = 0; 206 207 switch (cmd) { 208 case SIOCALIFADDR: 209 case SIOCDLIFADDR: 210 if ((error = suser(td)) != 0) 211 return error; 212 /*fall through*/ 213 case SIOCGLIFADDR: 214 if (!ifp) 215 return EINVAL; 216 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 217 } 218 219 /* 220 * Find address for this interface, if it exists. 221 * 222 * If an alias address was specified, find that one instead of 223 * the first one on the interface, if possible 224 */ 225 if (ifp) { 226 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 227 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 228 if (iap->ia_ifp == ifp && 229 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 230 ia = iap; 231 break; 232 } 233 if (ia == NULL) 234 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 235 iap = ifatoia(ifa); 236 if (iap->ia_addr.sin_family == AF_INET) { 237 ia = iap; 238 break; 239 } 240 } 241 } 242 243 switch (cmd) { 244 245 case SIOCAIFADDR: 246 case SIOCDIFADDR: 247 if (ifp == 0) 248 return (EADDRNOTAVAIL); 249 if (ifra->ifra_addr.sin_family == AF_INET) { 250 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 251 if (ia->ia_ifp == ifp && 252 ia->ia_addr.sin_addr.s_addr == 253 ifra->ifra_addr.sin_addr.s_addr) 254 break; 255 } 256 if ((ifp->if_flags & IFF_POINTOPOINT) 257 && (cmd == SIOCAIFADDR) 258 && (ifra->ifra_dstaddr.sin_addr.s_addr 259 == INADDR_ANY)) { 260 return EDESTADDRREQ; 261 } 262 } 263 if (cmd == SIOCDIFADDR && ia == 0) 264 return (EADDRNOTAVAIL); 265 /* FALLTHROUGH */ 266 case SIOCSIFADDR: 267 case SIOCSIFNETMASK: 268 case SIOCSIFDSTADDR: 269 if ((error = suser(td)) != 0) 270 return error; 271 272 if (ifp == 0) 273 return (EADDRNOTAVAIL); 274 if (ia == (struct in_ifaddr *)0) { 275 ia = (struct in_ifaddr *) 276 malloc(sizeof *ia, M_IFADDR, M_WAITOK); 277 if (ia == (struct in_ifaddr *)NULL) 278 return (ENOBUFS); 279 bzero((caddr_t)ia, sizeof *ia); 280 /* 281 * Protect from ipintr() traversing address list 282 * while we're modifying it. 283 */ 284 s = splnet(); 285 286 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 287 ifa = &ia->ia_ifa; 288 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 289 290 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 291 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 292 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 293 ia->ia_sockmask.sin_len = 8; 294 ia->ia_sockmask.sin_family = AF_INET; 295 if (ifp->if_flags & IFF_BROADCAST) { 296 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 297 ia->ia_broadaddr.sin_family = AF_INET; 298 } 299 ia->ia_ifp = ifp; 300 if (!(ifp->if_flags & IFF_LOOPBACK)) 301 in_interfaces++; 302 iaIsNew = 1; 303 splx(s); 304 } 305 break; 306 307 case SIOCSIFBRDADDR: 308 if ((error = suser(td)) != 0) 309 return error; 310 /* FALLTHROUGH */ 311 312 case SIOCGIFADDR: 313 case SIOCGIFNETMASK: 314 case SIOCGIFDSTADDR: 315 case SIOCGIFBRDADDR: 316 if (ia == (struct in_ifaddr *)0) 317 return (EADDRNOTAVAIL); 318 break; 319 } 320 switch (cmd) { 321 322 case SIOCGIFADDR: 323 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 324 return (0); 325 326 case SIOCGIFBRDADDR: 327 if ((ifp->if_flags & IFF_BROADCAST) == 0) 328 return (EINVAL); 329 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 330 return (0); 331 332 case SIOCGIFDSTADDR: 333 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 334 return (EINVAL); 335 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 336 return (0); 337 338 case SIOCGIFNETMASK: 339 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 340 return (0); 341 342 case SIOCSIFDSTADDR: 343 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 344 return (EINVAL); 345 oldaddr = ia->ia_dstaddr; 346 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 347 if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 348 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 349 ia->ia_dstaddr = oldaddr; 350 return (error); 351 } 352 if (ia->ia_flags & IFA_ROUTE) { 353 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 354 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 355 ia->ia_ifa.ifa_dstaddr = 356 (struct sockaddr *)&ia->ia_dstaddr; 357 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 358 } 359 return (0); 360 361 case SIOCSIFBRDADDR: 362 if ((ifp->if_flags & IFF_BROADCAST) == 0) 363 return (EINVAL); 364 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 365 return (0); 366 367 case SIOCSIFADDR: 368 error = in_ifinit(ifp, ia, 369 (struct sockaddr_in *) &ifr->ifr_addr, 1); 370 if (error != 0 && iaIsNew) 371 break; 372 return (0); 373 374 case SIOCSIFNETMASK: 375 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 376 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 377 return (0); 378 379 case SIOCAIFADDR: 380 maskIsNew = 0; 381 hostIsNew = 1; 382 error = 0; 383 if (ia->ia_addr.sin_family == AF_INET) { 384 if (ifra->ifra_addr.sin_len == 0) { 385 ifra->ifra_addr = ia->ia_addr; 386 hostIsNew = 0; 387 } else if (ifra->ifra_addr.sin_addr.s_addr == 388 ia->ia_addr.sin_addr.s_addr) 389 hostIsNew = 0; 390 } 391 if (ifra->ifra_mask.sin_len) { 392 in_ifscrub(ifp, ia); 393 ia->ia_sockmask = ifra->ifra_mask; 394 ia->ia_sockmask.sin_family = AF_INET; 395 ia->ia_subnetmask = 396 ntohl(ia->ia_sockmask.sin_addr.s_addr); 397 maskIsNew = 1; 398 } 399 if ((ifp->if_flags & IFF_POINTOPOINT) && 400 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 401 in_ifscrub(ifp, ia); 402 ia->ia_dstaddr = ifra->ifra_dstaddr; 403 maskIsNew = 1; /* We lie; but the effect's the same */ 404 } 405 if (ifra->ifra_addr.sin_family == AF_INET && 406 (hostIsNew || maskIsNew)) 407 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 408 409 if (error != 0 && iaIsNew) 410 break; 411 412 if ((ifp->if_flags & IFF_BROADCAST) && 413 (ifra->ifra_broadaddr.sin_family == AF_INET)) 414 ia->ia_broadaddr = ifra->ifra_broadaddr; 415 return (error); 416 417 case SIOCDIFADDR: 418 /* 419 * in_ifscrub kills the interface route. 420 */ 421 in_ifscrub(ifp, ia); 422 /* 423 * in_ifadown gets rid of all the rest of 424 * the routes. This is not quite the right 425 * thing to do, but at least if we are running 426 * a routing process they will come back. 427 */ 428 in_ifadown(&ia->ia_ifa, 1); 429 /* 430 * XXX horrible hack to detect that we are being called 431 * from if_detach() 432 */ 433 if (!ifnet_addrs[ifp->if_index - 1]) { 434 in_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); 435 in_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); 436 } 437 error = 0; 438 break; 439 440 default: 441 if (ifp == 0 || ifp->if_ioctl == 0) 442 return (EOPNOTSUPP); 443 return ((*ifp->if_ioctl)(ifp, cmd, data)); 444 } 445 446 /* 447 * Protect from ipintr() traversing address list while we're modifying 448 * it. 449 */ 450 s = splnet(); 451 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 452 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 453 LIST_REMOVE(ia, ia_hash); 454 IFAFREE(&ia->ia_ifa); 455 splx(s); 456 457 return (error); 458 } 459 460 /* 461 * SIOC[GAD]LIFADDR. 462 * SIOCGLIFADDR: get first address. (?!?) 463 * SIOCGLIFADDR with IFLR_PREFIX: 464 * get first address that matches the specified prefix. 465 * SIOCALIFADDR: add the specified address. 466 * SIOCALIFADDR with IFLR_PREFIX: 467 * EINVAL since we can't deduce hostid part of the address. 468 * SIOCDLIFADDR: delete the specified address. 469 * SIOCDLIFADDR with IFLR_PREFIX: 470 * delete the first address that matches the specified prefix. 471 * return values: 472 * EINVAL on invalid parameters 473 * EADDRNOTAVAIL on prefix match failed/specified address not found 474 * other values may be returned from in_ioctl() 475 */ 476 static int 477 in_lifaddr_ioctl(so, cmd, data, ifp, td) 478 struct socket *so; 479 u_long cmd; 480 caddr_t data; 481 struct ifnet *ifp; 482 struct thread *td; 483 { 484 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 485 struct ifaddr *ifa; 486 487 /* sanity checks */ 488 if (!data || !ifp) { 489 panic("invalid argument to in_lifaddr_ioctl"); 490 /*NOTRECHED*/ 491 } 492 493 switch (cmd) { 494 case SIOCGLIFADDR: 495 /* address must be specified on GET with IFLR_PREFIX */ 496 if ((iflr->flags & IFLR_PREFIX) == 0) 497 break; 498 /*FALLTHROUGH*/ 499 case SIOCALIFADDR: 500 case SIOCDLIFADDR: 501 /* address must be specified on ADD and DELETE */ 502 if (iflr->addr.ss_family != AF_INET) 503 return EINVAL; 504 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 505 return EINVAL; 506 /* XXX need improvement */ 507 if (iflr->dstaddr.ss_family 508 && iflr->dstaddr.ss_family != AF_INET) 509 return EINVAL; 510 if (iflr->dstaddr.ss_family 511 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 512 return EINVAL; 513 break; 514 default: /*shouldn't happen*/ 515 return EOPNOTSUPP; 516 } 517 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 518 return EINVAL; 519 520 switch (cmd) { 521 case SIOCALIFADDR: 522 { 523 struct in_aliasreq ifra; 524 525 if (iflr->flags & IFLR_PREFIX) 526 return EINVAL; 527 528 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 529 bzero(&ifra, sizeof(ifra)); 530 bcopy(iflr->iflr_name, ifra.ifra_name, 531 sizeof(ifra.ifra_name)); 532 533 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 534 535 if (iflr->dstaddr.ss_family) { /*XXX*/ 536 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 537 iflr->dstaddr.ss_len); 538 } 539 540 ifra.ifra_mask.sin_family = AF_INET; 541 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 542 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 543 544 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 545 } 546 case SIOCGLIFADDR: 547 case SIOCDLIFADDR: 548 { 549 struct in_ifaddr *ia; 550 struct in_addr mask, candidate, match; 551 struct sockaddr_in *sin; 552 int cmp; 553 554 bzero(&mask, sizeof(mask)); 555 if (iflr->flags & IFLR_PREFIX) { 556 /* lookup a prefix rather than address. */ 557 in_len2mask(&mask, iflr->prefixlen); 558 559 sin = (struct sockaddr_in *)&iflr->addr; 560 match.s_addr = sin->sin_addr.s_addr; 561 match.s_addr &= mask.s_addr; 562 563 /* if you set extra bits, that's wrong */ 564 if (match.s_addr != sin->sin_addr.s_addr) 565 return EINVAL; 566 567 cmp = 1; 568 } else { 569 if (cmd == SIOCGLIFADDR) { 570 /* on getting an address, take the 1st match */ 571 cmp = 0; /*XXX*/ 572 } else { 573 /* on deleting an address, do exact match */ 574 in_len2mask(&mask, 32); 575 sin = (struct sockaddr_in *)&iflr->addr; 576 match.s_addr = sin->sin_addr.s_addr; 577 578 cmp = 1; 579 } 580 } 581 582 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 583 if (ifa->ifa_addr->sa_family != AF_INET6) 584 continue; 585 if (!cmp) 586 break; 587 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 588 candidate.s_addr &= mask.s_addr; 589 if (candidate.s_addr == match.s_addr) 590 break; 591 } 592 if (!ifa) 593 return EADDRNOTAVAIL; 594 ia = (struct in_ifaddr *)ifa; 595 596 if (cmd == SIOCGLIFADDR) { 597 /* fill in the if_laddrreq structure */ 598 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 599 600 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 601 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 602 ia->ia_dstaddr.sin_len); 603 } else 604 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 605 606 iflr->prefixlen = 607 in_mask2len(&ia->ia_sockmask.sin_addr); 608 609 iflr->flags = 0; /*XXX*/ 610 611 return 0; 612 } else { 613 struct in_aliasreq ifra; 614 615 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 616 bzero(&ifra, sizeof(ifra)); 617 bcopy(iflr->iflr_name, ifra.ifra_name, 618 sizeof(ifra.ifra_name)); 619 620 bcopy(&ia->ia_addr, &ifra.ifra_addr, 621 ia->ia_addr.sin_len); 622 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 623 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 624 ia->ia_dstaddr.sin_len); 625 } 626 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 627 ia->ia_sockmask.sin_len); 628 629 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 630 ifp, td); 631 } 632 } 633 } 634 635 return EOPNOTSUPP; /*just for safety*/ 636 } 637 638 /* 639 * Delete any existing route for an interface. 640 */ 641 void 642 in_ifscrub(ifp, ia) 643 register struct ifnet *ifp; 644 register struct in_ifaddr *ia; 645 { 646 647 if ((ia->ia_flags & IFA_ROUTE) == 0) 648 return; 649 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 650 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 651 else 652 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 653 ia->ia_flags &= ~IFA_ROUTE; 654 } 655 656 /* 657 * Initialize an interface's internet address 658 * and routing table entry. 659 */ 660 static int 661 in_ifinit(ifp, ia, sin, scrub) 662 register struct ifnet *ifp; 663 register struct in_ifaddr *ia; 664 struct sockaddr_in *sin; 665 int scrub; 666 { 667 register u_long i = ntohl(sin->sin_addr.s_addr); 668 struct sockaddr_in oldaddr; 669 int s = splimp(), flags = RTF_UP, error = 0; 670 671 oldaddr = ia->ia_addr; 672 if (oldaddr.sin_family == AF_INET) 673 LIST_REMOVE(ia, ia_hash); 674 ia->ia_addr = *sin; 675 if (ia->ia_addr.sin_family == AF_INET) 676 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 677 ia, ia_hash); 678 /* 679 * Give the interface a chance to initialize 680 * if this is its first address, 681 * and to validate the address if necessary. 682 */ 683 if (ifp->if_ioctl && 684 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 685 splx(s); 686 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 687 ia->ia_addr = oldaddr; 688 if (ia->ia_addr.sin_family == AF_INET) 689 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 690 ia, ia_hash); 691 return (error); 692 } 693 splx(s); 694 if (scrub) { 695 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 696 in_ifscrub(ifp, ia); 697 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 698 } 699 if (IN_CLASSA(i)) 700 ia->ia_netmask = IN_CLASSA_NET; 701 else if (IN_CLASSB(i)) 702 ia->ia_netmask = IN_CLASSB_NET; 703 else 704 ia->ia_netmask = IN_CLASSC_NET; 705 /* 706 * The subnet mask usually includes at least the standard network part, 707 * but may may be smaller in the case of supernetting. 708 * If it is set, we believe it. 709 */ 710 if (ia->ia_subnetmask == 0) { 711 ia->ia_subnetmask = ia->ia_netmask; 712 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 713 } else 714 ia->ia_netmask &= ia->ia_subnetmask; 715 ia->ia_net = i & ia->ia_netmask; 716 ia->ia_subnet = i & ia->ia_subnetmask; 717 in_socktrim(&ia->ia_sockmask); 718 /* 719 * Add route for the network. 720 */ 721 ia->ia_ifa.ifa_metric = ifp->if_metric; 722 if (ifp->if_flags & IFF_BROADCAST) { 723 ia->ia_broadaddr.sin_addr.s_addr = 724 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 725 ia->ia_netbroadcast.s_addr = 726 htonl(ia->ia_net | ~ ia->ia_netmask); 727 } else if (ifp->if_flags & IFF_LOOPBACK) { 728 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 729 flags |= RTF_HOST; 730 } else if (ifp->if_flags & IFF_POINTOPOINT) { 731 if (ia->ia_dstaddr.sin_family != AF_INET) 732 return (0); 733 flags |= RTF_HOST; 734 } 735 736 /*- 737 * Don't add host routes for interface addresses of 738 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 739 * possible to assign several such address pairs with consistent 740 * results (no host route) and is required by BOOTP. 741 * 742 * XXX: This is ugly ! There should be a way for the caller to 743 * say that they don't want a host route. 744 */ 745 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 746 ia->ia_netmask != IN_CLASSA_NET || 747 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 748 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 749 ia->ia_addr = oldaddr; 750 return (error); 751 } 752 ia->ia_flags |= IFA_ROUTE; 753 } 754 755 /* 756 * If the interface supports multicast, join the "all hosts" 757 * multicast group on that interface. 758 */ 759 if (ifp->if_flags & IFF_MULTICAST) { 760 struct in_addr addr; 761 762 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 763 in_addmulti(&addr, ifp); 764 } 765 return (error); 766 } 767 768 769 /* 770 * Return 1 if the address might be a local broadcast address. 771 */ 772 int 773 in_broadcast(in, ifp) 774 struct in_addr in; 775 struct ifnet *ifp; 776 { 777 register struct ifaddr *ifa; 778 u_long t; 779 780 if (in.s_addr == INADDR_BROADCAST || 781 in.s_addr == INADDR_ANY) 782 return 1; 783 if ((ifp->if_flags & IFF_BROADCAST) == 0) 784 return 0; 785 t = ntohl(in.s_addr); 786 /* 787 * Look through the list of addresses for a match 788 * with a broadcast address. 789 */ 790 #define ia ((struct in_ifaddr *)ifa) 791 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 792 if (ifa->ifa_addr->sa_family == AF_INET && 793 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 794 in.s_addr == ia->ia_netbroadcast.s_addr || 795 /* 796 * Check for old-style (host 0) broadcast. 797 */ 798 t == ia->ia_subnet || t == ia->ia_net) && 799 /* 800 * Check for an all one subnetmask. These 801 * only exist when an interface gets a secondary 802 * address. 803 */ 804 ia->ia_subnetmask != (u_long)0xffffffff) 805 return 1; 806 return (0); 807 #undef ia 808 } 809 /* 810 * Add an address to the list of IP multicast addresses for a given interface. 811 */ 812 struct in_multi * 813 in_addmulti(ap, ifp) 814 register struct in_addr *ap; 815 register struct ifnet *ifp; 816 { 817 register struct in_multi *inm; 818 int error; 819 struct sockaddr_in sin; 820 struct ifmultiaddr *ifma; 821 int s = splnet(); 822 823 /* 824 * Call generic routine to add membership or increment 825 * refcount. It wants addresses in the form of a sockaddr, 826 * so we build one here (being careful to zero the unused bytes). 827 */ 828 bzero(&sin, sizeof sin); 829 sin.sin_family = AF_INET; 830 sin.sin_len = sizeof sin; 831 sin.sin_addr = *ap; 832 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 833 if (error) { 834 splx(s); 835 return 0; 836 } 837 838 /* 839 * If ifma->ifma_protospec is null, then if_addmulti() created 840 * a new record. Otherwise, we are done. 841 */ 842 if (ifma->ifma_protospec != 0) { 843 splx(s); 844 return ifma->ifma_protospec; 845 } 846 847 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 848 at interrupt time? If so, need to fix if_addmulti. XXX */ 849 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, M_NOWAIT); 850 if (inm == NULL) { 851 splx(s); 852 return (NULL); 853 } 854 855 bzero(inm, sizeof *inm); 856 inm->inm_addr = *ap; 857 inm->inm_ifp = ifp; 858 inm->inm_ifma = ifma; 859 ifma->ifma_protospec = inm; 860 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 861 862 /* 863 * Let IGMP know that we have joined a new IP multicast group. 864 */ 865 igmp_joingroup(inm); 866 splx(s); 867 return (inm); 868 } 869 870 /* 871 * Delete a multicast address record. 872 */ 873 void 874 in_delmulti(inm) 875 register struct in_multi *inm; 876 { 877 struct ifmultiaddr *ifma = inm->inm_ifma; 878 struct in_multi my_inm; 879 int s = splnet(); 880 881 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 882 if (ifma->ifma_refcount == 1) { 883 /* 884 * No remaining claims to this record; let IGMP know that 885 * we are leaving the multicast group. 886 * But do it after the if_delmulti() which might reset 887 * the interface and nuke the packet. 888 */ 889 my_inm = *inm ; 890 ifma->ifma_protospec = 0; 891 LIST_REMOVE(inm, inm_link); 892 free(inm, M_IPMADDR); 893 } 894 /* XXX - should be separate API for when we have an ifma? */ 895 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 896 if (my_inm.inm_ifp != NULL) 897 igmp_leavegroup(&my_inm); 898 splx(s); 899 } 900