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 1.11 2004/06/07 02:36:22 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 (struct in_addr *); 61 static void in_len2mask (struct in_addr *, int); 62 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t, 63 struct ifnet *, struct thread *); 64 65 static void in_socktrim (struct sockaddr_in *); 66 static int in_ifinit (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 u_long i = ntohl(in.s_addr); 89 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 u_long i = ntohl(in.s_addr); 113 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 char *cplim = (char *) &ap->sin_addr; 133 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 * NOTE! td might be NULL. 188 */ 189 /* ARGSUSED */ 190 int 191 in_control(so, cmd, data, ifp, td) 192 struct socket *so; 193 u_long cmd; 194 caddr_t data; 195 struct ifnet *ifp; 196 struct thread *td; 197 { 198 struct ifreq *ifr = (struct ifreq *)data; 199 struct in_ifaddr *ia = 0, *iap; 200 struct ifaddr *ifa; 201 struct in_addr dst; 202 struct in_ifaddr *oia; 203 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 204 struct sockaddr_in oldaddr; 205 int hostIsNew, iaIsNew, maskIsNew, s; 206 int error = 0; 207 208 iaIsNew = 0; 209 210 switch (cmd) { 211 case SIOCALIFADDR: 212 case SIOCDLIFADDR: 213 if (td && (error = suser(td)) != 0) 214 return error; 215 /*fall through*/ 216 case SIOCGLIFADDR: 217 if (!ifp) 218 return EINVAL; 219 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 220 } 221 222 /* 223 * Find address for this interface, if it exists. 224 * 225 * If an alias address was specified, find that one instead of 226 * the first one on the interface, if possible 227 */ 228 if (ifp) { 229 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 230 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 231 if (iap->ia_ifp == ifp && 232 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 233 ia = iap; 234 break; 235 } 236 if (ia == NULL) 237 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 238 iap = ifatoia(ifa); 239 if (iap->ia_addr.sin_family == AF_INET) { 240 ia = iap; 241 break; 242 } 243 } 244 } 245 246 switch (cmd) { 247 248 case SIOCAIFADDR: 249 case SIOCDIFADDR: 250 if (ifp == 0) 251 return (EADDRNOTAVAIL); 252 if (ifra->ifra_addr.sin_family == AF_INET) { 253 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 254 if (ia->ia_ifp == ifp && 255 ia->ia_addr.sin_addr.s_addr == 256 ifra->ifra_addr.sin_addr.s_addr) 257 break; 258 } 259 if ((ifp->if_flags & IFF_POINTOPOINT) 260 && (cmd == SIOCAIFADDR) 261 && (ifra->ifra_dstaddr.sin_addr.s_addr 262 == INADDR_ANY)) { 263 return EDESTADDRREQ; 264 } 265 } 266 if (cmd == SIOCDIFADDR && ia == 0) 267 return (EADDRNOTAVAIL); 268 /* FALLTHROUGH */ 269 case SIOCSIFADDR: 270 case SIOCSIFNETMASK: 271 case SIOCSIFDSTADDR: 272 if (td && (error = suser(td)) != 0) 273 return error; 274 275 if (ifp == 0) 276 return (EADDRNOTAVAIL); 277 if (ia == (struct in_ifaddr *)0) { 278 ia = (struct in_ifaddr *) 279 malloc(sizeof *ia, M_IFADDR, M_WAITOK); 280 if (ia == (struct in_ifaddr *)NULL) 281 return (ENOBUFS); 282 bzero((caddr_t)ia, sizeof *ia); 283 /* 284 * Protect from ipintr() traversing address list 285 * while we're modifying it. 286 */ 287 s = splnet(); 288 289 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 290 ifa = &ia->ia_ifa; 291 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 292 293 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 294 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 295 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 296 ia->ia_sockmask.sin_len = 8; 297 ia->ia_sockmask.sin_family = AF_INET; 298 if (ifp->if_flags & IFF_BROADCAST) { 299 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 300 ia->ia_broadaddr.sin_family = AF_INET; 301 } 302 ia->ia_ifp = ifp; 303 if (!(ifp->if_flags & IFF_LOOPBACK)) 304 in_interfaces++; 305 iaIsNew = 1; 306 splx(s); 307 } 308 break; 309 310 case SIOCSIFBRDADDR: 311 if (td && (error = suser(td)) != 0) 312 return error; 313 /* FALLTHROUGH */ 314 315 case SIOCGIFADDR: 316 case SIOCGIFNETMASK: 317 case SIOCGIFDSTADDR: 318 case SIOCGIFBRDADDR: 319 if (ia == (struct in_ifaddr *)0) 320 return (EADDRNOTAVAIL); 321 break; 322 } 323 switch (cmd) { 324 325 case SIOCGIFADDR: 326 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 327 return (0); 328 329 case SIOCGIFBRDADDR: 330 if ((ifp->if_flags & IFF_BROADCAST) == 0) 331 return (EINVAL); 332 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 333 return (0); 334 335 case SIOCGIFDSTADDR: 336 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 337 return (EINVAL); 338 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 339 return (0); 340 341 case SIOCGIFNETMASK: 342 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 343 return (0); 344 345 case SIOCSIFDSTADDR: 346 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 347 return (EINVAL); 348 oldaddr = ia->ia_dstaddr; 349 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 350 if (ifp->if_ioctl && 351 (error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 352 td->td_proc->p_ucred))) { 353 ia->ia_dstaddr = oldaddr; 354 return (error); 355 } 356 if (ia->ia_flags & IFA_ROUTE) { 357 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 358 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 359 ia->ia_ifa.ifa_dstaddr = 360 (struct sockaddr *)&ia->ia_dstaddr; 361 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 362 } 363 return (0); 364 365 case SIOCSIFBRDADDR: 366 if ((ifp->if_flags & IFF_BROADCAST) == 0) 367 return (EINVAL); 368 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 369 return (0); 370 371 case SIOCSIFADDR: 372 error = in_ifinit(ifp, ia, 373 (struct sockaddr_in *) &ifr->ifr_addr, 1); 374 if (error != 0 && iaIsNew) 375 break; 376 return (0); 377 378 case SIOCSIFNETMASK: 379 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 380 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 381 return (0); 382 383 case SIOCAIFADDR: 384 maskIsNew = 0; 385 hostIsNew = 1; 386 error = 0; 387 if (ia->ia_addr.sin_family == AF_INET) { 388 if (ifra->ifra_addr.sin_len == 0) { 389 ifra->ifra_addr = ia->ia_addr; 390 hostIsNew = 0; 391 } else if (ifra->ifra_addr.sin_addr.s_addr == 392 ia->ia_addr.sin_addr.s_addr) 393 hostIsNew = 0; 394 } 395 if (ifra->ifra_mask.sin_len) { 396 in_ifscrub(ifp, ia); 397 ia->ia_sockmask = ifra->ifra_mask; 398 ia->ia_sockmask.sin_family = AF_INET; 399 ia->ia_subnetmask = 400 ntohl(ia->ia_sockmask.sin_addr.s_addr); 401 maskIsNew = 1; 402 } 403 if ((ifp->if_flags & IFF_POINTOPOINT) && 404 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 405 in_ifscrub(ifp, ia); 406 ia->ia_dstaddr = ifra->ifra_dstaddr; 407 maskIsNew = 1; /* We lie; but the effect's the same */ 408 } 409 if (ifra->ifra_addr.sin_family == AF_INET && 410 (hostIsNew || maskIsNew)) 411 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 412 413 if (error != 0 && iaIsNew) 414 break; 415 416 if ((ifp->if_flags & IFF_BROADCAST) && 417 (ifra->ifra_broadaddr.sin_family == AF_INET)) 418 ia->ia_broadaddr = ifra->ifra_broadaddr; 419 return (error); 420 421 case SIOCDIFADDR: 422 /* 423 * in_ifscrub kills the interface route. 424 */ 425 in_ifscrub(ifp, ia); 426 /* 427 * in_ifadown gets rid of all the rest of 428 * the routes. This is not quite the right 429 * thing to do, but at least if we are running 430 * a routing process they will come back. 431 */ 432 in_ifadown(&ia->ia_ifa, 1); 433 /* 434 * XXX horrible hack to detect that we are being called 435 * from if_detach() 436 */ 437 if (!ifnet_addrs[ifp->if_index - 1]) { 438 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 439 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 440 } 441 error = 0; 442 break; 443 444 default: 445 if (ifp == NULL || ifp->if_ioctl == NULL) 446 return (EOPNOTSUPP); 447 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred)); 448 } 449 450 /* 451 * Protect from ipintr() traversing address list while we're modifying 452 * it. 453 */ 454 s = splnet(); 455 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 456 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 457 LIST_REMOVE(ia, ia_hash); 458 IFAFREE(&ia->ia_ifa); 459 splx(s); 460 461 return (error); 462 } 463 464 /* 465 * SIOC[GAD]LIFADDR. 466 * SIOCGLIFADDR: get first address. (?!?) 467 * SIOCGLIFADDR with IFLR_PREFIX: 468 * get first address that matches the specified prefix. 469 * SIOCALIFADDR: add the specified address. 470 * SIOCALIFADDR with IFLR_PREFIX: 471 * EINVAL since we can't deduce hostid part of the address. 472 * SIOCDLIFADDR: delete the specified address. 473 * SIOCDLIFADDR with IFLR_PREFIX: 474 * delete the first address that matches the specified prefix. 475 * return values: 476 * EINVAL on invalid parameters 477 * EADDRNOTAVAIL on prefix match failed/specified address not found 478 * other values may be returned from in_ioctl() 479 * 480 * NOTE! td might be NULL. 481 */ 482 static int 483 in_lifaddr_ioctl(so, cmd, data, ifp, td) 484 struct socket *so; 485 u_long cmd; 486 caddr_t data; 487 struct ifnet *ifp; 488 struct thread *td; 489 { 490 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 491 struct ifaddr *ifa; 492 493 /* sanity checks */ 494 if (!data || !ifp) { 495 panic("invalid argument to in_lifaddr_ioctl"); 496 /*NOTRECHED*/ 497 } 498 499 switch (cmd) { 500 case SIOCGLIFADDR: 501 /* address must be specified on GET with IFLR_PREFIX */ 502 if ((iflr->flags & IFLR_PREFIX) == 0) 503 break; 504 /*FALLTHROUGH*/ 505 case SIOCALIFADDR: 506 case SIOCDLIFADDR: 507 /* address must be specified on ADD and DELETE */ 508 if (iflr->addr.ss_family != AF_INET) 509 return EINVAL; 510 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 511 return EINVAL; 512 /* XXX need improvement */ 513 if (iflr->dstaddr.ss_family 514 && iflr->dstaddr.ss_family != AF_INET) 515 return EINVAL; 516 if (iflr->dstaddr.ss_family 517 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 518 return EINVAL; 519 break; 520 default: /*shouldn't happen*/ 521 return EOPNOTSUPP; 522 } 523 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 524 return EINVAL; 525 526 switch (cmd) { 527 case SIOCALIFADDR: 528 { 529 struct in_aliasreq ifra; 530 531 if (iflr->flags & IFLR_PREFIX) 532 return EINVAL; 533 534 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 535 bzero(&ifra, sizeof(ifra)); 536 bcopy(iflr->iflr_name, ifra.ifra_name, 537 sizeof(ifra.ifra_name)); 538 539 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 540 541 if (iflr->dstaddr.ss_family) { /*XXX*/ 542 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 543 iflr->dstaddr.ss_len); 544 } 545 546 ifra.ifra_mask.sin_family = AF_INET; 547 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 548 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 549 550 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 551 } 552 case SIOCGLIFADDR: 553 case SIOCDLIFADDR: 554 { 555 struct in_ifaddr *ia; 556 struct in_addr mask, candidate, match; 557 struct sockaddr_in *sin; 558 int cmp; 559 560 bzero(&mask, sizeof(mask)); 561 if (iflr->flags & IFLR_PREFIX) { 562 /* lookup a prefix rather than address. */ 563 in_len2mask(&mask, iflr->prefixlen); 564 565 sin = (struct sockaddr_in *)&iflr->addr; 566 match.s_addr = sin->sin_addr.s_addr; 567 match.s_addr &= mask.s_addr; 568 569 /* if you set extra bits, that's wrong */ 570 if (match.s_addr != sin->sin_addr.s_addr) 571 return EINVAL; 572 573 cmp = 1; 574 } else { 575 if (cmd == SIOCGLIFADDR) { 576 /* on getting an address, take the 1st match */ 577 cmp = 0; /*XXX*/ 578 } else { 579 /* on deleting an address, do exact match */ 580 in_len2mask(&mask, 32); 581 sin = (struct sockaddr_in *)&iflr->addr; 582 match.s_addr = sin->sin_addr.s_addr; 583 584 cmp = 1; 585 } 586 } 587 588 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 589 if (ifa->ifa_addr->sa_family != AF_INET6) 590 continue; 591 if (!cmp) 592 break; 593 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 594 candidate.s_addr &= mask.s_addr; 595 if (candidate.s_addr == match.s_addr) 596 break; 597 } 598 if (!ifa) 599 return EADDRNOTAVAIL; 600 ia = (struct in_ifaddr *)ifa; 601 602 if (cmd == SIOCGLIFADDR) { 603 /* fill in the if_laddrreq structure */ 604 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 605 606 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 607 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 608 ia->ia_dstaddr.sin_len); 609 } else 610 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 611 612 iflr->prefixlen = 613 in_mask2len(&ia->ia_sockmask.sin_addr); 614 615 iflr->flags = 0; /*XXX*/ 616 617 return 0; 618 } else { 619 struct in_aliasreq ifra; 620 621 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 622 bzero(&ifra, sizeof(ifra)); 623 bcopy(iflr->iflr_name, ifra.ifra_name, 624 sizeof(ifra.ifra_name)); 625 626 bcopy(&ia->ia_addr, &ifra.ifra_addr, 627 ia->ia_addr.sin_len); 628 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 629 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 630 ia->ia_dstaddr.sin_len); 631 } 632 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 633 ia->ia_sockmask.sin_len); 634 635 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 636 ifp, td); 637 } 638 } 639 } 640 641 return EOPNOTSUPP; /*just for safety*/ 642 } 643 644 /* 645 * Delete any existing route for an interface. 646 */ 647 void 648 in_ifscrub(ifp, ia) 649 struct ifnet *ifp; 650 struct in_ifaddr *ia; 651 { 652 653 if ((ia->ia_flags & IFA_ROUTE) == 0) 654 return; 655 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 656 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 657 else 658 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 659 ia->ia_flags &= ~IFA_ROUTE; 660 } 661 662 /* 663 * Initialize an interface's internet address 664 * and routing table entry. 665 */ 666 static int 667 in_ifinit(ifp, ia, sin, scrub) 668 struct ifnet *ifp; 669 struct in_ifaddr *ia; 670 struct sockaddr_in *sin; 671 int scrub; 672 { 673 u_long i = ntohl(sin->sin_addr.s_addr); 674 struct sockaddr_in oldaddr; 675 int s = splimp(), flags = RTF_UP, error = 0; 676 677 oldaddr = ia->ia_addr; 678 if (oldaddr.sin_family == AF_INET) 679 LIST_REMOVE(ia, ia_hash); 680 ia->ia_addr = *sin; 681 if (ia->ia_addr.sin_family == AF_INET) 682 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 683 ia, ia_hash); 684 /* 685 * Give the interface a chance to initialize 686 * if this is its first address, 687 * and to validate the address if necessary. 688 */ 689 if (ifp->if_ioctl && 690 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia, 691 (struct ucred *)NULL))) { 692 splx(s); 693 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 694 ia->ia_addr = oldaddr; 695 if (ia->ia_addr.sin_family == AF_INET) 696 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 697 ia, ia_hash); 698 return (error); 699 } 700 splx(s); 701 if (scrub) { 702 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 703 in_ifscrub(ifp, ia); 704 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 705 } 706 if (IN_CLASSA(i)) 707 ia->ia_netmask = IN_CLASSA_NET; 708 else if (IN_CLASSB(i)) 709 ia->ia_netmask = IN_CLASSB_NET; 710 else 711 ia->ia_netmask = IN_CLASSC_NET; 712 /* 713 * The subnet mask usually includes at least the standard network part, 714 * but may may be smaller in the case of supernetting. 715 * If it is set, we believe it. 716 */ 717 if (ia->ia_subnetmask == 0) { 718 ia->ia_subnetmask = ia->ia_netmask; 719 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 720 } else 721 ia->ia_netmask &= ia->ia_subnetmask; 722 ia->ia_net = i & ia->ia_netmask; 723 ia->ia_subnet = i & ia->ia_subnetmask; 724 in_socktrim(&ia->ia_sockmask); 725 /* 726 * Add route for the network. 727 */ 728 ia->ia_ifa.ifa_metric = ifp->if_metric; 729 if (ifp->if_flags & IFF_BROADCAST) { 730 ia->ia_broadaddr.sin_addr.s_addr = 731 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 732 ia->ia_netbroadcast.s_addr = 733 htonl(ia->ia_net | ~ ia->ia_netmask); 734 } else if (ifp->if_flags & IFF_LOOPBACK) { 735 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 736 flags |= RTF_HOST; 737 } else if (ifp->if_flags & IFF_POINTOPOINT) { 738 if (ia->ia_dstaddr.sin_family != AF_INET) 739 return (0); 740 flags |= RTF_HOST; 741 } 742 743 /*- 744 * Don't add host routes for interface addresses of 745 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 746 * possible to assign several such address pairs with consistent 747 * results (no host route) and is required by BOOTP. 748 * 749 * XXX: This is ugly ! There should be a way for the caller to 750 * say that they don't want a host route. 751 */ 752 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 753 ia->ia_netmask != IN_CLASSA_NET || 754 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 755 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 756 ia->ia_addr = oldaddr; 757 return (error); 758 } 759 ia->ia_flags |= IFA_ROUTE; 760 } 761 762 /* 763 * If the interface supports multicast, join the "all hosts" 764 * multicast group on that interface. 765 */ 766 if (ifp->if_flags & IFF_MULTICAST) { 767 struct in_addr addr; 768 769 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 770 in_addmulti(&addr, ifp); 771 } 772 return (error); 773 } 774 775 776 /* 777 * Return 1 if the address might be a local broadcast address. 778 */ 779 int 780 in_broadcast(in, ifp) 781 struct in_addr in; 782 struct ifnet *ifp; 783 { 784 struct ifaddr *ifa; 785 u_long t; 786 787 if (in.s_addr == INADDR_BROADCAST || 788 in.s_addr == INADDR_ANY) 789 return 1; 790 if ((ifp->if_flags & IFF_BROADCAST) == 0) 791 return 0; 792 t = ntohl(in.s_addr); 793 /* 794 * Look through the list of addresses for a match 795 * with a broadcast address. 796 */ 797 #define ia ((struct in_ifaddr *)ifa) 798 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 799 if (ifa->ifa_addr->sa_family == AF_INET && 800 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 801 in.s_addr == ia->ia_netbroadcast.s_addr || 802 /* 803 * Check for old-style (host 0) broadcast. 804 */ 805 t == ia->ia_subnet || t == ia->ia_net) && 806 /* 807 * Check for an all one subnetmask. These 808 * only exist when an interface gets a secondary 809 * address. 810 */ 811 ia->ia_subnetmask != (u_long)0xffffffff) 812 return 1; 813 return (0); 814 #undef ia 815 } 816 /* 817 * Add an address to the list of IP multicast addresses for a given interface. 818 */ 819 struct in_multi * 820 in_addmulti(ap, ifp) 821 struct in_addr *ap; 822 struct ifnet *ifp; 823 { 824 struct in_multi *inm; 825 int error; 826 struct sockaddr_in sin; 827 struct ifmultiaddr *ifma; 828 int s = splnet(); 829 830 /* 831 * Call generic routine to add membership or increment 832 * refcount. It wants addresses in the form of a sockaddr, 833 * so we build one here (being careful to zero the unused bytes). 834 */ 835 bzero(&sin, sizeof sin); 836 sin.sin_family = AF_INET; 837 sin.sin_len = sizeof sin; 838 sin.sin_addr = *ap; 839 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 840 if (error) { 841 splx(s); 842 return 0; 843 } 844 845 /* 846 * If ifma->ifma_protospec is null, then if_addmulti() created 847 * a new record. Otherwise, we are done. 848 */ 849 if (ifma->ifma_protospec != 0) { 850 splx(s); 851 return ifma->ifma_protospec; 852 } 853 854 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 855 at interrupt time? If so, need to fix if_addmulti. XXX */ 856 inm = malloc(sizeof(*inm), M_IPMADDR, M_WAITOK | M_ZERO); 857 inm->inm_addr = *ap; 858 inm->inm_ifp = ifp; 859 inm->inm_ifma = ifma; 860 ifma->ifma_protospec = inm; 861 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 862 863 /* 864 * Let IGMP know that we have joined a new IP multicast group. 865 */ 866 igmp_joingroup(inm); 867 splx(s); 868 return (inm); 869 } 870 871 /* 872 * Delete a multicast address record. 873 */ 874 void 875 in_delmulti(inm) 876 struct in_multi *inm; 877 { 878 struct ifmultiaddr *ifma = inm->inm_ifma; 879 struct in_multi my_inm; 880 int s = splnet(); 881 882 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 883 if (ifma->ifma_refcount == 1) { 884 /* 885 * No remaining claims to this record; let IGMP know that 886 * we are leaving the multicast group. 887 * But do it after the if_delmulti() which might reset 888 * the interface and nuke the packet. 889 */ 890 my_inm = *inm ; 891 ifma->ifma_protospec = 0; 892 LIST_REMOVE(inm, inm_link); 893 free(inm, M_IPMADDR); 894 } 895 /* XXX - should be separate API for when we have an ifma? */ 896 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 897 if (my_inm.inm_ifp != NULL) 898 igmp_leavegroup(&my_inm); 899 splx(s); 900 } 901