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 1.7 2003/08/23 11:18:00 rob 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 && (error = (*ifp->if_ioctl) 351 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 352 ia->ia_dstaddr = oldaddr; 353 return (error); 354 } 355 if (ia->ia_flags & IFA_ROUTE) { 356 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 357 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 358 ia->ia_ifa.ifa_dstaddr = 359 (struct sockaddr *)&ia->ia_dstaddr; 360 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 361 } 362 return (0); 363 364 case SIOCSIFBRDADDR: 365 if ((ifp->if_flags & IFF_BROADCAST) == 0) 366 return (EINVAL); 367 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 368 return (0); 369 370 case SIOCSIFADDR: 371 error = in_ifinit(ifp, ia, 372 (struct sockaddr_in *) &ifr->ifr_addr, 1); 373 if (error != 0 && iaIsNew) 374 break; 375 return (0); 376 377 case SIOCSIFNETMASK: 378 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 379 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 380 return (0); 381 382 case SIOCAIFADDR: 383 maskIsNew = 0; 384 hostIsNew = 1; 385 error = 0; 386 if (ia->ia_addr.sin_family == AF_INET) { 387 if (ifra->ifra_addr.sin_len == 0) { 388 ifra->ifra_addr = ia->ia_addr; 389 hostIsNew = 0; 390 } else if (ifra->ifra_addr.sin_addr.s_addr == 391 ia->ia_addr.sin_addr.s_addr) 392 hostIsNew = 0; 393 } 394 if (ifra->ifra_mask.sin_len) { 395 in_ifscrub(ifp, ia); 396 ia->ia_sockmask = ifra->ifra_mask; 397 ia->ia_sockmask.sin_family = AF_INET; 398 ia->ia_subnetmask = 399 ntohl(ia->ia_sockmask.sin_addr.s_addr); 400 maskIsNew = 1; 401 } 402 if ((ifp->if_flags & IFF_POINTOPOINT) && 403 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 404 in_ifscrub(ifp, ia); 405 ia->ia_dstaddr = ifra->ifra_dstaddr; 406 maskIsNew = 1; /* We lie; but the effect's the same */ 407 } 408 if (ifra->ifra_addr.sin_family == AF_INET && 409 (hostIsNew || maskIsNew)) 410 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 411 412 if (error != 0 && iaIsNew) 413 break; 414 415 if ((ifp->if_flags & IFF_BROADCAST) && 416 (ifra->ifra_broadaddr.sin_family == AF_INET)) 417 ia->ia_broadaddr = ifra->ifra_broadaddr; 418 return (error); 419 420 case SIOCDIFADDR: 421 /* 422 * in_ifscrub kills the interface route. 423 */ 424 in_ifscrub(ifp, ia); 425 /* 426 * in_ifadown gets rid of all the rest of 427 * the routes. This is not quite the right 428 * thing to do, but at least if we are running 429 * a routing process they will come back. 430 */ 431 in_ifadown(&ia->ia_ifa, 1); 432 /* 433 * XXX horrible hack to detect that we are being called 434 * from if_detach() 435 */ 436 if (!ifnet_addrs[ifp->if_index - 1]) { 437 in_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); 438 in_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); 439 } 440 error = 0; 441 break; 442 443 default: 444 if (ifp == 0 || ifp->if_ioctl == 0) 445 return (EOPNOTSUPP); 446 return ((*ifp->if_ioctl)(ifp, cmd, data)); 447 } 448 449 /* 450 * Protect from ipintr() traversing address list while we're modifying 451 * it. 452 */ 453 s = splnet(); 454 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 455 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 456 LIST_REMOVE(ia, ia_hash); 457 IFAFREE(&ia->ia_ifa); 458 splx(s); 459 460 return (error); 461 } 462 463 /* 464 * SIOC[GAD]LIFADDR. 465 * SIOCGLIFADDR: get first address. (?!?) 466 * SIOCGLIFADDR with IFLR_PREFIX: 467 * get first address that matches the specified prefix. 468 * SIOCALIFADDR: add the specified address. 469 * SIOCALIFADDR with IFLR_PREFIX: 470 * EINVAL since we can't deduce hostid part of the address. 471 * SIOCDLIFADDR: delete the specified address. 472 * SIOCDLIFADDR with IFLR_PREFIX: 473 * delete the first address that matches the specified prefix. 474 * return values: 475 * EINVAL on invalid parameters 476 * EADDRNOTAVAIL on prefix match failed/specified address not found 477 * other values may be returned from in_ioctl() 478 * 479 * NOTE! td might be NULL. 480 */ 481 static int 482 in_lifaddr_ioctl(so, cmd, data, ifp, td) 483 struct socket *so; 484 u_long cmd; 485 caddr_t data; 486 struct ifnet *ifp; 487 struct thread *td; 488 { 489 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 490 struct ifaddr *ifa; 491 492 /* sanity checks */ 493 if (!data || !ifp) { 494 panic("invalid argument to in_lifaddr_ioctl"); 495 /*NOTRECHED*/ 496 } 497 498 switch (cmd) { 499 case SIOCGLIFADDR: 500 /* address must be specified on GET with IFLR_PREFIX */ 501 if ((iflr->flags & IFLR_PREFIX) == 0) 502 break; 503 /*FALLTHROUGH*/ 504 case SIOCALIFADDR: 505 case SIOCDLIFADDR: 506 /* address must be specified on ADD and DELETE */ 507 if (iflr->addr.ss_family != AF_INET) 508 return EINVAL; 509 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 510 return EINVAL; 511 /* XXX need improvement */ 512 if (iflr->dstaddr.ss_family 513 && iflr->dstaddr.ss_family != AF_INET) 514 return EINVAL; 515 if (iflr->dstaddr.ss_family 516 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 517 return EINVAL; 518 break; 519 default: /*shouldn't happen*/ 520 return EOPNOTSUPP; 521 } 522 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 523 return EINVAL; 524 525 switch (cmd) { 526 case SIOCALIFADDR: 527 { 528 struct in_aliasreq ifra; 529 530 if (iflr->flags & IFLR_PREFIX) 531 return EINVAL; 532 533 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 534 bzero(&ifra, sizeof(ifra)); 535 bcopy(iflr->iflr_name, ifra.ifra_name, 536 sizeof(ifra.ifra_name)); 537 538 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 539 540 if (iflr->dstaddr.ss_family) { /*XXX*/ 541 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 542 iflr->dstaddr.ss_len); 543 } 544 545 ifra.ifra_mask.sin_family = AF_INET; 546 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 547 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 548 549 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 550 } 551 case SIOCGLIFADDR: 552 case SIOCDLIFADDR: 553 { 554 struct in_ifaddr *ia; 555 struct in_addr mask, candidate, match; 556 struct sockaddr_in *sin; 557 int cmp; 558 559 bzero(&mask, sizeof(mask)); 560 if (iflr->flags & IFLR_PREFIX) { 561 /* lookup a prefix rather than address. */ 562 in_len2mask(&mask, iflr->prefixlen); 563 564 sin = (struct sockaddr_in *)&iflr->addr; 565 match.s_addr = sin->sin_addr.s_addr; 566 match.s_addr &= mask.s_addr; 567 568 /* if you set extra bits, that's wrong */ 569 if (match.s_addr != sin->sin_addr.s_addr) 570 return EINVAL; 571 572 cmp = 1; 573 } else { 574 if (cmd == SIOCGLIFADDR) { 575 /* on getting an address, take the 1st match */ 576 cmp = 0; /*XXX*/ 577 } else { 578 /* on deleting an address, do exact match */ 579 in_len2mask(&mask, 32); 580 sin = (struct sockaddr_in *)&iflr->addr; 581 match.s_addr = sin->sin_addr.s_addr; 582 583 cmp = 1; 584 } 585 } 586 587 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 588 if (ifa->ifa_addr->sa_family != AF_INET6) 589 continue; 590 if (!cmp) 591 break; 592 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 593 candidate.s_addr &= mask.s_addr; 594 if (candidate.s_addr == match.s_addr) 595 break; 596 } 597 if (!ifa) 598 return EADDRNOTAVAIL; 599 ia = (struct in_ifaddr *)ifa; 600 601 if (cmd == SIOCGLIFADDR) { 602 /* fill in the if_laddrreq structure */ 603 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 604 605 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 606 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 607 ia->ia_dstaddr.sin_len); 608 } else 609 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 610 611 iflr->prefixlen = 612 in_mask2len(&ia->ia_sockmask.sin_addr); 613 614 iflr->flags = 0; /*XXX*/ 615 616 return 0; 617 } else { 618 struct in_aliasreq ifra; 619 620 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 621 bzero(&ifra, sizeof(ifra)); 622 bcopy(iflr->iflr_name, ifra.ifra_name, 623 sizeof(ifra.ifra_name)); 624 625 bcopy(&ia->ia_addr, &ifra.ifra_addr, 626 ia->ia_addr.sin_len); 627 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 628 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 629 ia->ia_dstaddr.sin_len); 630 } 631 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 632 ia->ia_sockmask.sin_len); 633 634 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 635 ifp, td); 636 } 637 } 638 } 639 640 return EOPNOTSUPP; /*just for safety*/ 641 } 642 643 /* 644 * Delete any existing route for an interface. 645 */ 646 void 647 in_ifscrub(ifp, ia) 648 struct ifnet *ifp; 649 struct in_ifaddr *ia; 650 { 651 652 if ((ia->ia_flags & IFA_ROUTE) == 0) 653 return; 654 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 655 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 656 else 657 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 658 ia->ia_flags &= ~IFA_ROUTE; 659 } 660 661 /* 662 * Initialize an interface's internet address 663 * and routing table entry. 664 */ 665 static int 666 in_ifinit(ifp, ia, sin, scrub) 667 struct ifnet *ifp; 668 struct in_ifaddr *ia; 669 struct sockaddr_in *sin; 670 int scrub; 671 { 672 u_long i = ntohl(sin->sin_addr.s_addr); 673 struct sockaddr_in oldaddr; 674 int s = splimp(), flags = RTF_UP, error = 0; 675 676 oldaddr = ia->ia_addr; 677 if (oldaddr.sin_family == AF_INET) 678 LIST_REMOVE(ia, ia_hash); 679 ia->ia_addr = *sin; 680 if (ia->ia_addr.sin_family == AF_INET) 681 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 682 ia, ia_hash); 683 /* 684 * Give the interface a chance to initialize 685 * if this is its first address, 686 * and to validate the address if necessary. 687 */ 688 if (ifp->if_ioctl && 689 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 690 splx(s); 691 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 692 ia->ia_addr = oldaddr; 693 if (ia->ia_addr.sin_family == AF_INET) 694 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 695 ia, ia_hash); 696 return (error); 697 } 698 splx(s); 699 if (scrub) { 700 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 701 in_ifscrub(ifp, ia); 702 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 703 } 704 if (IN_CLASSA(i)) 705 ia->ia_netmask = IN_CLASSA_NET; 706 else if (IN_CLASSB(i)) 707 ia->ia_netmask = IN_CLASSB_NET; 708 else 709 ia->ia_netmask = IN_CLASSC_NET; 710 /* 711 * The subnet mask usually includes at least the standard network part, 712 * but may may be smaller in the case of supernetting. 713 * If it is set, we believe it. 714 */ 715 if (ia->ia_subnetmask == 0) { 716 ia->ia_subnetmask = ia->ia_netmask; 717 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 718 } else 719 ia->ia_netmask &= ia->ia_subnetmask; 720 ia->ia_net = i & ia->ia_netmask; 721 ia->ia_subnet = i & ia->ia_subnetmask; 722 in_socktrim(&ia->ia_sockmask); 723 /* 724 * Add route for the network. 725 */ 726 ia->ia_ifa.ifa_metric = ifp->if_metric; 727 if (ifp->if_flags & IFF_BROADCAST) { 728 ia->ia_broadaddr.sin_addr.s_addr = 729 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 730 ia->ia_netbroadcast.s_addr = 731 htonl(ia->ia_net | ~ ia->ia_netmask); 732 } else if (ifp->if_flags & IFF_LOOPBACK) { 733 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 734 flags |= RTF_HOST; 735 } else if (ifp->if_flags & IFF_POINTOPOINT) { 736 if (ia->ia_dstaddr.sin_family != AF_INET) 737 return (0); 738 flags |= RTF_HOST; 739 } 740 741 /*- 742 * Don't add host routes for interface addresses of 743 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 744 * possible to assign several such address pairs with consistent 745 * results (no host route) and is required by BOOTP. 746 * 747 * XXX: This is ugly ! There should be a way for the caller to 748 * say that they don't want a host route. 749 */ 750 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 751 ia->ia_netmask != IN_CLASSA_NET || 752 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 753 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 754 ia->ia_addr = oldaddr; 755 return (error); 756 } 757 ia->ia_flags |= IFA_ROUTE; 758 } 759 760 /* 761 * If the interface supports multicast, join the "all hosts" 762 * multicast group on that interface. 763 */ 764 if (ifp->if_flags & IFF_MULTICAST) { 765 struct in_addr addr; 766 767 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 768 in_addmulti(&addr, ifp); 769 } 770 return (error); 771 } 772 773 774 /* 775 * Return 1 if the address might be a local broadcast address. 776 */ 777 int 778 in_broadcast(in, ifp) 779 struct in_addr in; 780 struct ifnet *ifp; 781 { 782 struct ifaddr *ifa; 783 u_long t; 784 785 if (in.s_addr == INADDR_BROADCAST || 786 in.s_addr == INADDR_ANY) 787 return 1; 788 if ((ifp->if_flags & IFF_BROADCAST) == 0) 789 return 0; 790 t = ntohl(in.s_addr); 791 /* 792 * Look through the list of addresses for a match 793 * with a broadcast address. 794 */ 795 #define ia ((struct in_ifaddr *)ifa) 796 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 797 if (ifa->ifa_addr->sa_family == AF_INET && 798 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 799 in.s_addr == ia->ia_netbroadcast.s_addr || 800 /* 801 * Check for old-style (host 0) broadcast. 802 */ 803 t == ia->ia_subnet || t == ia->ia_net) && 804 /* 805 * Check for an all one subnetmask. These 806 * only exist when an interface gets a secondary 807 * address. 808 */ 809 ia->ia_subnetmask != (u_long)0xffffffff) 810 return 1; 811 return (0); 812 #undef ia 813 } 814 /* 815 * Add an address to the list of IP multicast addresses for a given interface. 816 */ 817 struct in_multi * 818 in_addmulti(ap, ifp) 819 struct in_addr *ap; 820 struct ifnet *ifp; 821 { 822 struct in_multi *inm; 823 int error; 824 struct sockaddr_in sin; 825 struct ifmultiaddr *ifma; 826 int s = splnet(); 827 828 /* 829 * Call generic routine to add membership or increment 830 * refcount. It wants addresses in the form of a sockaddr, 831 * so we build one here (being careful to zero the unused bytes). 832 */ 833 bzero(&sin, sizeof sin); 834 sin.sin_family = AF_INET; 835 sin.sin_len = sizeof sin; 836 sin.sin_addr = *ap; 837 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 838 if (error) { 839 splx(s); 840 return 0; 841 } 842 843 /* 844 * If ifma->ifma_protospec is null, then if_addmulti() created 845 * a new record. Otherwise, we are done. 846 */ 847 if (ifma->ifma_protospec != 0) { 848 splx(s); 849 return ifma->ifma_protospec; 850 } 851 852 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 853 at interrupt time? If so, need to fix if_addmulti. XXX */ 854 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, M_NOWAIT); 855 if (inm == NULL) { 856 splx(s); 857 return (NULL); 858 } 859 860 bzero(inm, sizeof *inm); 861 inm->inm_addr = *ap; 862 inm->inm_ifp = ifp; 863 inm->inm_ifma = ifma; 864 ifma->ifma_protospec = inm; 865 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 866 867 /* 868 * Let IGMP know that we have joined a new IP multicast group. 869 */ 870 igmp_joingroup(inm); 871 splx(s); 872 return (inm); 873 } 874 875 /* 876 * Delete a multicast address record. 877 */ 878 void 879 in_delmulti(inm) 880 struct in_multi *inm; 881 { 882 struct ifmultiaddr *ifma = inm->inm_ifma; 883 struct in_multi my_inm; 884 int s = splnet(); 885 886 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 887 if (ifma->ifma_refcount == 1) { 888 /* 889 * No remaining claims to this record; let IGMP know that 890 * we are leaving the multicast group. 891 * But do it after the if_delmulti() which might reset 892 * the interface and nuke the packet. 893 */ 894 my_inm = *inm ; 895 ifma->ifma_protospec = 0; 896 LIST_REMOVE(inm, inm_link); 897 free(inm, M_IPMADDR); 898 } 899 /* XXX - should be separate API for when we have an ifma? */ 900 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 901 if (my_inm.inm_ifp != NULL) 902 igmp_leavegroup(&my_inm); 903 splx(s); 904 } 905