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 1.14 2005/01/06 09:14:13 hsu 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(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, RTM_DELETE, RTF_HOST); 359 ia->ia_ifa.ifa_dstaddr = 360 (struct sockaddr *)&ia->ia_dstaddr; 361 rtinit(&ia->ia_ifa, 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 if (error == 0) 377 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 378 return (0); 379 380 case SIOCSIFNETMASK: 381 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 382 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 383 return (0); 384 385 case SIOCAIFADDR: 386 maskIsNew = 0; 387 hostIsNew = 1; 388 error = 0; 389 if (ia->ia_addr.sin_family == AF_INET) { 390 if (ifra->ifra_addr.sin_len == 0) { 391 ifra->ifra_addr = ia->ia_addr; 392 hostIsNew = 0; 393 } else if (ifra->ifra_addr.sin_addr.s_addr == 394 ia->ia_addr.sin_addr.s_addr) 395 hostIsNew = 0; 396 } 397 if (ifra->ifra_mask.sin_len) { 398 in_ifscrub(ifp, ia); 399 ia->ia_sockmask = ifra->ifra_mask; 400 ia->ia_sockmask.sin_family = AF_INET; 401 ia->ia_subnetmask = 402 ntohl(ia->ia_sockmask.sin_addr.s_addr); 403 maskIsNew = 1; 404 } 405 if ((ifp->if_flags & IFF_POINTOPOINT) && 406 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 407 in_ifscrub(ifp, ia); 408 ia->ia_dstaddr = ifra->ifra_dstaddr; 409 maskIsNew = 1; /* We lie; but the effect's the same */ 410 } 411 if (ifra->ifra_addr.sin_family == AF_INET && 412 (hostIsNew || maskIsNew)) 413 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 414 415 if (error != 0 && iaIsNew) 416 break; 417 418 if ((ifp->if_flags & IFF_BROADCAST) && 419 (ifra->ifra_broadaddr.sin_family == AF_INET)) 420 ia->ia_broadaddr = ifra->ifra_broadaddr; 421 if (error == 0) 422 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 423 return (error); 424 425 case SIOCDIFADDR: 426 /* 427 * in_ifscrub kills the interface route. 428 */ 429 in_ifscrub(ifp, ia); 430 /* 431 * in_ifadown gets rid of all the rest of 432 * the routes. This is not quite the right 433 * thing to do, but at least if we are running 434 * a routing process they will come back. 435 */ 436 in_ifadown(&ia->ia_ifa, 1); 437 /* 438 * XXX horrible hack to detect that we are being called 439 * from if_detach() 440 */ 441 if (!ifnet_addrs[ifp->if_index - 1]) { 442 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 443 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 444 } 445 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 446 error = 0; 447 break; 448 449 default: 450 if (ifp == NULL || ifp->if_ioctl == NULL) 451 return (EOPNOTSUPP); 452 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred)); 453 } 454 455 /* 456 * Protect from ipintr() traversing address list while we're modifying 457 * it. 458 */ 459 s = splnet(); 460 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 461 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 462 LIST_REMOVE(ia, ia_hash); 463 IFAFREE(&ia->ia_ifa); 464 splx(s); 465 466 return (error); 467 } 468 469 /* 470 * SIOC[GAD]LIFADDR. 471 * SIOCGLIFADDR: get first address. (?!?) 472 * SIOCGLIFADDR with IFLR_PREFIX: 473 * get first address that matches the specified prefix. 474 * SIOCALIFADDR: add the specified address. 475 * SIOCALIFADDR with IFLR_PREFIX: 476 * EINVAL since we can't deduce hostid part of the address. 477 * SIOCDLIFADDR: delete the specified address. 478 * SIOCDLIFADDR with IFLR_PREFIX: 479 * delete the first address that matches the specified prefix. 480 * return values: 481 * EINVAL on invalid parameters 482 * EADDRNOTAVAIL on prefix match failed/specified address not found 483 * other values may be returned from in_ioctl() 484 * 485 * NOTE! td might be NULL. 486 */ 487 static int 488 in_lifaddr_ioctl(so, cmd, data, ifp, td) 489 struct socket *so; 490 u_long cmd; 491 caddr_t data; 492 struct ifnet *ifp; 493 struct thread *td; 494 { 495 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 496 struct ifaddr *ifa; 497 498 /* sanity checks */ 499 if (!data || !ifp) { 500 panic("invalid argument to in_lifaddr_ioctl"); 501 /*NOTRECHED*/ 502 } 503 504 switch (cmd) { 505 case SIOCGLIFADDR: 506 /* address must be specified on GET with IFLR_PREFIX */ 507 if ((iflr->flags & IFLR_PREFIX) == 0) 508 break; 509 /*FALLTHROUGH*/ 510 case SIOCALIFADDR: 511 case SIOCDLIFADDR: 512 /* address must be specified on ADD and DELETE */ 513 if (iflr->addr.ss_family != AF_INET) 514 return EINVAL; 515 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 516 return EINVAL; 517 /* XXX need improvement */ 518 if (iflr->dstaddr.ss_family 519 && iflr->dstaddr.ss_family != AF_INET) 520 return EINVAL; 521 if (iflr->dstaddr.ss_family 522 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 523 return EINVAL; 524 break; 525 default: /*shouldn't happen*/ 526 return EOPNOTSUPP; 527 } 528 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 529 return EINVAL; 530 531 switch (cmd) { 532 case SIOCALIFADDR: 533 { 534 struct in_aliasreq ifra; 535 536 if (iflr->flags & IFLR_PREFIX) 537 return EINVAL; 538 539 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 540 bzero(&ifra, sizeof ifra); 541 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 542 543 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 544 545 if (iflr->dstaddr.ss_family) { /*XXX*/ 546 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 547 iflr->dstaddr.ss_len); 548 } 549 550 ifra.ifra_mask.sin_family = AF_INET; 551 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 552 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 553 554 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 555 } 556 case SIOCGLIFADDR: 557 case SIOCDLIFADDR: 558 { 559 struct in_ifaddr *ia; 560 struct in_addr mask, candidate, match; 561 struct sockaddr_in *sin; 562 int cmp; 563 564 bzero(&mask, sizeof mask); 565 if (iflr->flags & IFLR_PREFIX) { 566 /* lookup a prefix rather than address. */ 567 in_len2mask(&mask, iflr->prefixlen); 568 569 sin = (struct sockaddr_in *)&iflr->addr; 570 match.s_addr = sin->sin_addr.s_addr; 571 match.s_addr &= mask.s_addr; 572 573 /* if you set extra bits, that's wrong */ 574 if (match.s_addr != sin->sin_addr.s_addr) 575 return EINVAL; 576 577 cmp = 1; 578 } else { 579 if (cmd == SIOCGLIFADDR) { 580 /* on getting an address, take the 1st match */ 581 cmp = 0; /*XXX*/ 582 } else { 583 /* on deleting an address, do exact match */ 584 in_len2mask(&mask, 32); 585 sin = (struct sockaddr_in *)&iflr->addr; 586 match.s_addr = sin->sin_addr.s_addr; 587 588 cmp = 1; 589 } 590 } 591 592 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 593 if (ifa->ifa_addr->sa_family != AF_INET6) 594 continue; 595 if (!cmp) 596 break; 597 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 598 candidate.s_addr &= mask.s_addr; 599 if (candidate.s_addr == match.s_addr) 600 break; 601 } 602 if (!ifa) 603 return EADDRNOTAVAIL; 604 ia = (struct in_ifaddr *)ifa; 605 606 if (cmd == SIOCGLIFADDR) { 607 /* fill in the if_laddrreq structure */ 608 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 609 610 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 611 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 612 ia->ia_dstaddr.sin_len); 613 } else 614 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 615 616 iflr->prefixlen = 617 in_mask2len(&ia->ia_sockmask.sin_addr); 618 619 iflr->flags = 0; /*XXX*/ 620 621 return 0; 622 } else { 623 struct in_aliasreq ifra; 624 625 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 626 bzero(&ifra, sizeof ifra); 627 bcopy(iflr->iflr_name, ifra.ifra_name, 628 sizeof ifra.ifra_name); 629 630 bcopy(&ia->ia_addr, &ifra.ifra_addr, 631 ia->ia_addr.sin_len); 632 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 633 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 634 ia->ia_dstaddr.sin_len); 635 } 636 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 637 ia->ia_sockmask.sin_len); 638 639 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 640 ifp, td); 641 } 642 } 643 } 644 645 return EOPNOTSUPP; /*just for safety*/ 646 } 647 648 /* 649 * Delete any existing route for an interface. 650 */ 651 void 652 in_ifscrub(ifp, ia) 653 struct ifnet *ifp; 654 struct in_ifaddr *ia; 655 { 656 657 if ((ia->ia_flags & IFA_ROUTE) == 0) 658 return; 659 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 660 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 661 else 662 rtinit(&ia->ia_ifa, RTM_DELETE, 0); 663 ia->ia_flags &= ~IFA_ROUTE; 664 } 665 666 /* 667 * Initialize an interface's internet address 668 * and routing table entry. 669 */ 670 static int 671 in_ifinit(ifp, ia, sin, scrub) 672 struct ifnet *ifp; 673 struct in_ifaddr *ia; 674 struct sockaddr_in *sin; 675 int scrub; 676 { 677 u_long i = ntohl(sin->sin_addr.s_addr); 678 struct sockaddr_in oldaddr; 679 int s = splimp(), flags = RTF_UP, error = 0; 680 681 oldaddr = ia->ia_addr; 682 if (oldaddr.sin_family == AF_INET) 683 LIST_REMOVE(ia, ia_hash); 684 ia->ia_addr = *sin; 685 if (ia->ia_addr.sin_family == AF_INET) 686 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 687 ia, ia_hash); 688 /* 689 * Give the interface a chance to initialize 690 * if this is its first address, 691 * and to validate the address if necessary. 692 */ 693 if (ifp->if_ioctl && 694 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia, 695 (struct ucred *)NULL))) { 696 splx(s); 697 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 698 ia->ia_addr = oldaddr; 699 if (ia->ia_addr.sin_family == AF_INET) 700 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 701 ia, ia_hash); 702 return (error); 703 } 704 splx(s); 705 if (scrub) { 706 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 707 in_ifscrub(ifp, ia); 708 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 709 } 710 if (IN_CLASSA(i)) 711 ia->ia_netmask = IN_CLASSA_NET; 712 else if (IN_CLASSB(i)) 713 ia->ia_netmask = IN_CLASSB_NET; 714 else 715 ia->ia_netmask = IN_CLASSC_NET; 716 /* 717 * The subnet mask usually includes at least the standard network part, 718 * but may may be smaller in the case of supernetting. 719 * If it is set, we believe it. 720 */ 721 if (ia->ia_subnetmask == 0) { 722 ia->ia_subnetmask = ia->ia_netmask; 723 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 724 } else 725 ia->ia_netmask &= ia->ia_subnetmask; 726 ia->ia_net = i & ia->ia_netmask; 727 ia->ia_subnet = i & ia->ia_subnetmask; 728 in_socktrim(&ia->ia_sockmask); 729 /* 730 * Add route for the network. 731 */ 732 ia->ia_ifa.ifa_metric = ifp->if_metric; 733 if (ifp->if_flags & IFF_BROADCAST) { 734 ia->ia_broadaddr.sin_addr.s_addr = 735 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 736 ia->ia_netbroadcast.s_addr = 737 htonl(ia->ia_net | ~ ia->ia_netmask); 738 } else if (ifp->if_flags & IFF_LOOPBACK) { 739 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 740 flags |= RTF_HOST; 741 } else if (ifp->if_flags & IFF_POINTOPOINT) { 742 if (ia->ia_dstaddr.sin_family != AF_INET) 743 return (0); 744 flags |= RTF_HOST; 745 } 746 747 /*- 748 * Don't add host routes for interface addresses of 749 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 750 * possible to assign several such address pairs with consistent 751 * results (no host route) and is required by BOOTP. 752 * 753 * XXX: This is ugly ! There should be a way for the caller to 754 * say that they don't want a host route. 755 */ 756 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 757 ia->ia_netmask != IN_CLASSA_NET || 758 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 759 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 760 ia->ia_addr = oldaddr; 761 return (error); 762 } 763 ia->ia_flags |= IFA_ROUTE; 764 } 765 766 /* 767 * If the interface supports multicast, join the "all hosts" 768 * multicast group on that interface. 769 */ 770 if (ifp->if_flags & IFF_MULTICAST) { 771 struct in_addr addr; 772 773 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 774 in_addmulti(&addr, ifp); 775 } 776 return (error); 777 } 778 779 780 /* 781 * Return 1 if the address might be a local broadcast address. 782 */ 783 int 784 in_broadcast(struct in_addr in, struct ifnet *ifp) 785 { 786 struct ifaddr *ifa; 787 u_long t; 788 789 if (in.s_addr == INADDR_BROADCAST || 790 in.s_addr == INADDR_ANY) 791 return 1; 792 if ((ifp->if_flags & IFF_BROADCAST) == 0) 793 return 0; 794 t = ntohl(in.s_addr); 795 /* 796 * Look through the list of addresses for a match 797 * with a broadcast address. 798 */ 799 #define ia ((struct in_ifaddr *)ifa) 800 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 801 if (ifa->ifa_addr->sa_family == AF_INET && 802 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 803 in.s_addr == ia->ia_netbroadcast.s_addr || 804 /* 805 * Check for old-style (host 0) broadcast. 806 */ 807 t == ia->ia_subnet || t == ia->ia_net) && 808 /* 809 * Check for an all one subnetmask. These 810 * only exist when an interface gets a secondary 811 * address. 812 */ 813 ia->ia_subnetmask != (u_long)0xffffffff) 814 return 1; 815 return (0); 816 #undef ia 817 } 818 /* 819 * Add an address to the list of IP multicast addresses for a given interface. 820 */ 821 struct in_multi * 822 in_addmulti(ap, ifp) 823 struct in_addr *ap; 824 struct ifnet *ifp; 825 { 826 struct in_multi *inm; 827 int error; 828 struct sockaddr_in sin; 829 struct ifmultiaddr *ifma; 830 int s = splnet(); 831 832 /* 833 * Call generic routine to add membership or increment 834 * refcount. It wants addresses in the form of a sockaddr, 835 * so we build one here (being careful to zero the unused bytes). 836 */ 837 bzero(&sin, sizeof sin); 838 sin.sin_family = AF_INET; 839 sin.sin_len = sizeof sin; 840 sin.sin_addr = *ap; 841 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 842 if (error) { 843 splx(s); 844 return 0; 845 } 846 847 /* 848 * If ifma->ifma_protospec is null, then if_addmulti() created 849 * a new record. Otherwise, we are done. 850 */ 851 if (ifma->ifma_protospec != 0) { 852 splx(s); 853 return ifma->ifma_protospec; 854 } 855 856 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 857 at interrupt time? If so, need to fix if_addmulti. XXX */ 858 inm = malloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 859 inm->inm_addr = *ap; 860 inm->inm_ifp = ifp; 861 inm->inm_ifma = ifma; 862 ifma->ifma_protospec = inm; 863 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 864 865 /* 866 * Let IGMP know that we have joined a new IP multicast group. 867 */ 868 igmp_joingroup(inm); 869 splx(s); 870 return (inm); 871 } 872 873 /* 874 * Delete a multicast address record. 875 */ 876 void 877 in_delmulti(inm) 878 struct in_multi *inm; 879 { 880 struct ifmultiaddr *ifma = inm->inm_ifma; 881 struct in_multi my_inm; 882 int s = splnet(); 883 884 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 885 if (ifma->ifma_refcount == 1) { 886 /* 887 * No remaining claims to this record; let IGMP know that 888 * we are leaving the multicast group. 889 * But do it after the if_delmulti() which might reset 890 * the interface and nuke the packet. 891 */ 892 my_inm = *inm ; 893 ifma->ifma_protospec = 0; 894 LIST_REMOVE(inm, inm_link); 895 free(inm, M_IPMADDR); 896 } 897 /* XXX - should be separate API for when we have an ifma? */ 898 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 899 if (my_inm.inm_ifp != NULL) 900 igmp_leavegroup(&my_inm); 901 splx(s); 902 } 903