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 1.16 2005/06/04 14:41:57 joerg 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 #include <sys/thread2.h> 48 49 #include <net/if.h> 50 #include <net/if_types.h> 51 #include <net/route.h> 52 53 #include <netinet/in.h> 54 #include <netinet/in_var.h> 55 #include <netinet/in_pcb.h> 56 57 #include <netinet/igmp_var.h> 58 59 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 60 61 static int in_mask2len (struct in_addr *); 62 static void in_len2mask (struct in_addr *, int); 63 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t, 64 struct ifnet *, struct thread *); 65 66 static void in_socktrim (struct sockaddr_in *); 67 static int in_ifinit (struct ifnet *, 68 struct in_ifaddr *, struct sockaddr_in *, int); 69 70 static int subnetsarelocal = 0; 71 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 72 &subnetsarelocal, 0, ""); 73 74 struct in_multihead in_multihead; /* XXX BSS initialization */ 75 76 extern struct inpcbinfo ripcbinfo; 77 extern struct inpcbinfo udbinfo; 78 79 /* 80 * Return 1 if an internet address is for a ``local'' host 81 * (one to which we have a connection). If subnetsarelocal 82 * is true, this includes other subnets of the local net. 83 * Otherwise, it includes only the directly-connected (sub)nets. 84 */ 85 int 86 in_localaddr(in) 87 struct in_addr in; 88 { 89 u_long i = ntohl(in.s_addr); 90 struct in_ifaddr *ia; 91 92 if (subnetsarelocal) { 93 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 94 if ((i & ia->ia_netmask) == ia->ia_net) 95 return (1); 96 } else { 97 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 98 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 99 return (1); 100 } 101 return (0); 102 } 103 104 /* 105 * Determine whether an IP address is in a reserved set of addresses 106 * that may not be forwarded, or whether datagrams to that destination 107 * may be forwarded. 108 */ 109 int 110 in_canforward(in) 111 struct in_addr in; 112 { 113 u_long i = ntohl(in.s_addr); 114 u_long net; 115 116 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 117 return (0); 118 if (IN_CLASSA(i)) { 119 net = i & IN_CLASSA_NET; 120 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 121 return (0); 122 } 123 return (1); 124 } 125 126 /* 127 * Trim a mask in a sockaddr 128 */ 129 static void 130 in_socktrim(ap) 131 struct sockaddr_in *ap; 132 { 133 char *cplim = (char *) &ap->sin_addr; 134 char *cp = (char *) (&ap->sin_addr + 1); 135 136 ap->sin_len = 0; 137 while (--cp >= cplim) 138 if (*cp) { 139 (ap)->sin_len = cp - (char *) (ap) + 1; 140 break; 141 } 142 } 143 144 static int 145 in_mask2len(mask) 146 struct in_addr *mask; 147 { 148 int x, y; 149 u_char *p; 150 151 p = (u_char *)mask; 152 for (x = 0; x < sizeof *mask; x++) { 153 if (p[x] != 0xff) 154 break; 155 } 156 y = 0; 157 if (x < sizeof *mask) { 158 for (y = 0; y < 8; y++) { 159 if ((p[x] & (0x80 >> y)) == 0) 160 break; 161 } 162 } 163 return x * 8 + y; 164 } 165 166 static void 167 in_len2mask(mask, len) 168 struct in_addr *mask; 169 int len; 170 { 171 int i; 172 u_char *p; 173 174 p = (u_char *)mask; 175 bzero(mask, sizeof *mask); 176 for (i = 0; i < len / 8; i++) 177 p[i] = 0xff; 178 if (len % 8) 179 p[i] = (0xff00 >> (len % 8)) & 0xff; 180 } 181 182 static int in_interfaces; /* number of external internet interfaces */ 183 184 /* 185 * Generic internet control operations (ioctl's). 186 * Ifp is 0 if not an interface-specific ioctl. 187 * 188 * NOTE! td might be NULL. 189 */ 190 /* ARGSUSED */ 191 int 192 in_control(so, cmd, data, ifp, td) 193 struct socket *so; 194 u_long cmd; 195 caddr_t data; 196 struct ifnet *ifp; 197 struct thread *td; 198 { 199 struct ifreq *ifr = (struct ifreq *)data; 200 struct in_ifaddr *ia = 0, *iap; 201 struct ifaddr *ifa; 202 struct in_addr dst; 203 struct in_ifaddr *oia; 204 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 205 struct sockaddr_in oldaddr; 206 int hostIsNew, iaIsNew, maskIsNew; 207 int error = 0; 208 209 iaIsNew = 0; 210 211 switch (cmd) { 212 case SIOCALIFADDR: 213 case SIOCDLIFADDR: 214 if (td && (error = suser(td)) != 0) 215 return error; 216 /*fall through*/ 217 case SIOCGLIFADDR: 218 if (!ifp) 219 return EINVAL; 220 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 221 } 222 223 /* 224 * Find address for this interface, if it exists. 225 * 226 * If an alias address was specified, find that one instead of 227 * the first one on the interface, if possible 228 */ 229 if (ifp) { 230 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 231 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 232 if (iap->ia_ifp == ifp && 233 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 234 ia = iap; 235 break; 236 } 237 if (ia == NULL) 238 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 239 iap = ifatoia(ifa); 240 if (iap->ia_addr.sin_family == AF_INET) { 241 ia = iap; 242 break; 243 } 244 } 245 } 246 247 switch (cmd) { 248 249 case SIOCAIFADDR: 250 case SIOCDIFADDR: 251 if (ifp == 0) 252 return (EADDRNOTAVAIL); 253 if (ifra->ifra_addr.sin_family == AF_INET) { 254 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 255 if (ia->ia_ifp == ifp && 256 ia->ia_addr.sin_addr.s_addr == 257 ifra->ifra_addr.sin_addr.s_addr) 258 break; 259 } 260 if ((ifp->if_flags & IFF_POINTOPOINT) 261 && (cmd == SIOCAIFADDR) 262 && (ifra->ifra_dstaddr.sin_addr.s_addr 263 == INADDR_ANY)) { 264 return EDESTADDRREQ; 265 } 266 } 267 if (cmd == SIOCDIFADDR && ia == 0) 268 return (EADDRNOTAVAIL); 269 /* FALLTHROUGH */ 270 case SIOCSIFADDR: 271 case SIOCSIFNETMASK: 272 case SIOCSIFDSTADDR: 273 if (td && (error = suser(td)) != 0) 274 return error; 275 276 if (ifp == 0) 277 return (EADDRNOTAVAIL); 278 if (ia == (struct in_ifaddr *)0) { 279 ia = (struct in_ifaddr *) 280 malloc(sizeof *ia, M_IFADDR, M_WAITOK); 281 if (ia == (struct in_ifaddr *)NULL) 282 return (ENOBUFS); 283 bzero(ia, sizeof *ia); 284 /* 285 * Protect from ipintr() traversing address list 286 * while we're modifying it. 287 */ 288 crit_enter(); 289 290 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 291 ifa = &ia->ia_ifa; 292 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 293 294 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 295 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 296 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 297 ia->ia_sockmask.sin_len = 8; 298 ia->ia_sockmask.sin_family = AF_INET; 299 if (ifp->if_flags & IFF_BROADCAST) { 300 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 301 ia->ia_broadaddr.sin_family = AF_INET; 302 } 303 ia->ia_ifp = ifp; 304 if (!(ifp->if_flags & IFF_LOOPBACK)) 305 in_interfaces++; 306 iaIsNew = 1; 307 crit_exit(); 308 } 309 break; 310 311 case SIOCSIFBRDADDR: 312 if (td && (error = suser(td)) != 0) 313 return error; 314 /* FALLTHROUGH */ 315 316 case SIOCGIFADDR: 317 case SIOCGIFNETMASK: 318 case SIOCGIFDSTADDR: 319 case SIOCGIFBRDADDR: 320 if (ia == (struct in_ifaddr *)0) 321 return (EADDRNOTAVAIL); 322 break; 323 } 324 switch (cmd) { 325 326 case SIOCGIFADDR: 327 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 328 return (0); 329 330 case SIOCGIFBRDADDR: 331 if ((ifp->if_flags & IFF_BROADCAST) == 0) 332 return (EINVAL); 333 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 334 return (0); 335 336 case SIOCGIFDSTADDR: 337 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 338 return (EINVAL); 339 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 340 return (0); 341 342 case SIOCGIFNETMASK: 343 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 344 return (0); 345 346 case SIOCSIFDSTADDR: 347 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 348 return (EINVAL); 349 oldaddr = ia->ia_dstaddr; 350 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 351 if (ifp->if_ioctl && 352 (error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 353 td->td_proc->p_ucred))) { 354 ia->ia_dstaddr = oldaddr; 355 return (error); 356 } 357 if (ia->ia_flags & IFA_ROUTE) { 358 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 359 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 360 ia->ia_ifa.ifa_dstaddr = 361 (struct sockaddr *)&ia->ia_dstaddr; 362 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 363 } 364 return (0); 365 366 case SIOCSIFBRDADDR: 367 if ((ifp->if_flags & IFF_BROADCAST) == 0) 368 return (EINVAL); 369 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 370 return (0); 371 372 case SIOCSIFADDR: 373 error = in_ifinit(ifp, ia, 374 (struct sockaddr_in *) &ifr->ifr_addr, 1); 375 if (error != 0 && iaIsNew) 376 break; 377 if (error == 0) 378 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 379 return (0); 380 381 case SIOCSIFNETMASK: 382 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 383 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 384 return (0); 385 386 case SIOCAIFADDR: 387 maskIsNew = 0; 388 hostIsNew = 1; 389 error = 0; 390 if (ia->ia_addr.sin_family == AF_INET) { 391 if (ifra->ifra_addr.sin_len == 0) { 392 ifra->ifra_addr = ia->ia_addr; 393 hostIsNew = 0; 394 } else if (ifra->ifra_addr.sin_addr.s_addr == 395 ia->ia_addr.sin_addr.s_addr) 396 hostIsNew = 0; 397 } 398 if (ifra->ifra_mask.sin_len) { 399 in_ifscrub(ifp, ia); 400 ia->ia_sockmask = ifra->ifra_mask; 401 ia->ia_sockmask.sin_family = AF_INET; 402 ia->ia_subnetmask = 403 ntohl(ia->ia_sockmask.sin_addr.s_addr); 404 maskIsNew = 1; 405 } 406 if ((ifp->if_flags & IFF_POINTOPOINT) && 407 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 408 in_ifscrub(ifp, ia); 409 ia->ia_dstaddr = ifra->ifra_dstaddr; 410 maskIsNew = 1; /* We lie; but the effect's the same */ 411 } 412 if (ifra->ifra_addr.sin_family == AF_INET && 413 (hostIsNew || maskIsNew)) 414 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 415 416 if (error != 0 && iaIsNew) 417 break; 418 419 if ((ifp->if_flags & IFF_BROADCAST) && 420 (ifra->ifra_broadaddr.sin_family == AF_INET)) 421 ia->ia_broadaddr = ifra->ifra_broadaddr; 422 if (error == 0) 423 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 424 return (error); 425 426 case SIOCDIFADDR: 427 /* 428 * in_ifscrub kills the interface route. 429 */ 430 in_ifscrub(ifp, ia); 431 /* 432 * in_ifadown gets rid of all the rest of 433 * the routes. This is not quite the right 434 * thing to do, but at least if we are running 435 * a routing process they will come back. 436 */ 437 in_ifadown(&ia->ia_ifa, 1); 438 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 439 error = 0; 440 break; 441 442 default: 443 if (ifp == NULL || ifp->if_ioctl == NULL) 444 return (EOPNOTSUPP); 445 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred)); 446 } 447 448 /* 449 * Protect from ipintr() traversing address list while we're modifying 450 * it. 451 */ 452 crit_enter(); 453 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 454 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 455 LIST_REMOVE(ia, ia_hash); 456 IFAFREE(&ia->ia_ifa); 457 crit_exit(); 458 459 return (error); 460 } 461 462 /* 463 * SIOC[GAD]LIFADDR. 464 * SIOCGLIFADDR: get first address. (?!?) 465 * SIOCGLIFADDR with IFLR_PREFIX: 466 * get first address that matches the specified prefix. 467 * SIOCALIFADDR: add the specified address. 468 * SIOCALIFADDR with IFLR_PREFIX: 469 * EINVAL since we can't deduce hostid part of the address. 470 * SIOCDLIFADDR: delete the specified address. 471 * SIOCDLIFADDR with IFLR_PREFIX: 472 * delete the first address that matches the specified prefix. 473 * return values: 474 * EINVAL on invalid parameters 475 * EADDRNOTAVAIL on prefix match failed/specified address not found 476 * other values may be returned from in_ioctl() 477 * 478 * NOTE! td might be NULL. 479 */ 480 static int 481 in_lifaddr_ioctl(so, cmd, data, ifp, td) 482 struct socket *so; 483 u_long cmd; 484 caddr_t data; 485 struct ifnet *ifp; 486 struct thread *td; 487 { 488 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 489 struct ifaddr *ifa; 490 491 /* sanity checks */ 492 if (!data || !ifp) { 493 panic("invalid argument to in_lifaddr_ioctl"); 494 /*NOTRECHED*/ 495 } 496 497 switch (cmd) { 498 case SIOCGLIFADDR: 499 /* address must be specified on GET with IFLR_PREFIX */ 500 if ((iflr->flags & IFLR_PREFIX) == 0) 501 break; 502 /*FALLTHROUGH*/ 503 case SIOCALIFADDR: 504 case SIOCDLIFADDR: 505 /* address must be specified on ADD and DELETE */ 506 if (iflr->addr.ss_family != AF_INET) 507 return EINVAL; 508 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 509 return EINVAL; 510 /* XXX need improvement */ 511 if (iflr->dstaddr.ss_family 512 && iflr->dstaddr.ss_family != AF_INET) 513 return EINVAL; 514 if (iflr->dstaddr.ss_family 515 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 516 return EINVAL; 517 break; 518 default: /*shouldn't happen*/ 519 return EOPNOTSUPP; 520 } 521 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 522 return EINVAL; 523 524 switch (cmd) { 525 case SIOCALIFADDR: 526 { 527 struct in_aliasreq ifra; 528 529 if (iflr->flags & IFLR_PREFIX) 530 return EINVAL; 531 532 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 533 bzero(&ifra, sizeof ifra); 534 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 535 536 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 537 538 if (iflr->dstaddr.ss_family) { /*XXX*/ 539 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 540 iflr->dstaddr.ss_len); 541 } 542 543 ifra.ifra_mask.sin_family = AF_INET; 544 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 545 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 546 547 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 548 } 549 case SIOCGLIFADDR: 550 case SIOCDLIFADDR: 551 { 552 struct in_ifaddr *ia; 553 struct in_addr mask, candidate, match; 554 struct sockaddr_in *sin; 555 int cmp; 556 557 bzero(&mask, sizeof mask); 558 if (iflr->flags & IFLR_PREFIX) { 559 /* lookup a prefix rather than address. */ 560 in_len2mask(&mask, iflr->prefixlen); 561 562 sin = (struct sockaddr_in *)&iflr->addr; 563 match.s_addr = sin->sin_addr.s_addr; 564 match.s_addr &= mask.s_addr; 565 566 /* if you set extra bits, that's wrong */ 567 if (match.s_addr != sin->sin_addr.s_addr) 568 return EINVAL; 569 570 cmp = 1; 571 } else { 572 if (cmd == SIOCGLIFADDR) { 573 /* on getting an address, take the 1st match */ 574 cmp = 0; /*XXX*/ 575 } else { 576 /* on deleting an address, do exact match */ 577 in_len2mask(&mask, 32); 578 sin = (struct sockaddr_in *)&iflr->addr; 579 match.s_addr = sin->sin_addr.s_addr; 580 581 cmp = 1; 582 } 583 } 584 585 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 586 if (ifa->ifa_addr->sa_family != AF_INET6) 587 continue; 588 if (!cmp) 589 break; 590 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 591 candidate.s_addr &= mask.s_addr; 592 if (candidate.s_addr == match.s_addr) 593 break; 594 } 595 if (!ifa) 596 return EADDRNOTAVAIL; 597 ia = (struct in_ifaddr *)ifa; 598 599 if (cmd == SIOCGLIFADDR) { 600 /* fill in the if_laddrreq structure */ 601 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 602 603 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 604 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 605 ia->ia_dstaddr.sin_len); 606 } else 607 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 608 609 iflr->prefixlen = 610 in_mask2len(&ia->ia_sockmask.sin_addr); 611 612 iflr->flags = 0; /*XXX*/ 613 614 return 0; 615 } else { 616 struct in_aliasreq ifra; 617 618 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 619 bzero(&ifra, sizeof ifra); 620 bcopy(iflr->iflr_name, ifra.ifra_name, 621 sizeof ifra.ifra_name); 622 623 bcopy(&ia->ia_addr, &ifra.ifra_addr, 624 ia->ia_addr.sin_len); 625 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 626 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 627 ia->ia_dstaddr.sin_len); 628 } 629 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 630 ia->ia_sockmask.sin_len); 631 632 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 633 ifp, td); 634 } 635 } 636 } 637 638 return EOPNOTSUPP; /*just for safety*/ 639 } 640 641 /* 642 * Delete any existing route for an interface. 643 */ 644 void 645 in_ifscrub(ifp, ia) 646 struct ifnet *ifp; 647 struct in_ifaddr *ia; 648 { 649 650 if ((ia->ia_flags & IFA_ROUTE) == 0) 651 return; 652 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 653 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 654 else 655 rtinit(&ia->ia_ifa, RTM_DELETE, 0); 656 ia->ia_flags &= ~IFA_ROUTE; 657 } 658 659 /* 660 * Initialize an interface's internet address 661 * and routing table entry. 662 */ 663 static int 664 in_ifinit(ifp, ia, sin, scrub) 665 struct ifnet *ifp; 666 struct in_ifaddr *ia; 667 struct sockaddr_in *sin; 668 int scrub; 669 { 670 u_long i = ntohl(sin->sin_addr.s_addr); 671 struct sockaddr_in oldaddr; 672 int flags = RTF_UP, error = 0; 673 674 crit_enter(); 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 (struct ucred *)NULL))) { 691 crit_exit(); 692 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 693 ia->ia_addr = oldaddr; 694 if (ia->ia_addr.sin_family == AF_INET) 695 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 696 ia, ia_hash); 697 return (error); 698 } 699 crit_exit(); 700 if (scrub) { 701 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 702 in_ifscrub(ifp, ia); 703 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 704 } 705 if (IN_CLASSA(i)) 706 ia->ia_netmask = IN_CLASSA_NET; 707 else if (IN_CLASSB(i)) 708 ia->ia_netmask = IN_CLASSB_NET; 709 else 710 ia->ia_netmask = IN_CLASSC_NET; 711 /* 712 * The subnet mask usually includes at least the standard network part, 713 * but may may be smaller in the case of supernetting. 714 * If it is set, we believe it. 715 */ 716 if (ia->ia_subnetmask == 0) { 717 ia->ia_subnetmask = ia->ia_netmask; 718 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 719 } else 720 ia->ia_netmask &= ia->ia_subnetmask; 721 ia->ia_net = i & ia->ia_netmask; 722 ia->ia_subnet = i & ia->ia_subnetmask; 723 in_socktrim(&ia->ia_sockmask); 724 /* 725 * Add route for the network. 726 */ 727 ia->ia_ifa.ifa_metric = ifp->if_metric; 728 if (ifp->if_flags & IFF_BROADCAST) { 729 ia->ia_broadaddr.sin_addr.s_addr = 730 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 731 ia->ia_netbroadcast.s_addr = 732 htonl(ia->ia_net | ~ ia->ia_netmask); 733 } else if (ifp->if_flags & IFF_LOOPBACK) { 734 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 735 flags |= RTF_HOST; 736 } else if (ifp->if_flags & IFF_POINTOPOINT) { 737 if (ia->ia_dstaddr.sin_family != AF_INET) 738 return (0); 739 flags |= RTF_HOST; 740 } 741 742 /*- 743 * Don't add host routes for interface addresses of 744 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 745 * possible to assign several such address pairs with consistent 746 * results (no host route) and is required by BOOTP. 747 * 748 * XXX: This is ugly ! There should be a way for the caller to 749 * say that they don't want a host route. 750 */ 751 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 752 ia->ia_netmask != IN_CLASSA_NET || 753 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 754 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 755 ia->ia_addr = oldaddr; 756 return (error); 757 } 758 ia->ia_flags |= IFA_ROUTE; 759 } 760 761 /* 762 * If the interface supports multicast, join the "all hosts" 763 * multicast group on that interface. 764 */ 765 if (ifp->if_flags & IFF_MULTICAST) { 766 struct in_addr addr; 767 768 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 769 in_addmulti(&addr, ifp); 770 } 771 return (error); 772 } 773 774 775 /* 776 * Return 1 if the address might be a local broadcast address. 777 */ 778 int 779 in_broadcast(struct in_addr in, struct ifnet *ifp) 780 { 781 struct ifaddr *ifa; 782 u_long t; 783 784 if (in.s_addr == INADDR_BROADCAST || 785 in.s_addr == INADDR_ANY) 786 return 1; 787 if ((ifp->if_flags & IFF_BROADCAST) == 0) 788 return 0; 789 t = ntohl(in.s_addr); 790 /* 791 * Look through the list of addresses for a match 792 * with a broadcast address. 793 */ 794 #define ia ((struct in_ifaddr *)ifa) 795 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 796 if (ifa->ifa_addr->sa_family == AF_INET && 797 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 798 in.s_addr == ia->ia_netbroadcast.s_addr || 799 /* 800 * Check for old-style (host 0) broadcast. 801 */ 802 t == ia->ia_subnet || t == ia->ia_net) && 803 /* 804 * Check for an all one subnetmask. These 805 * only exist when an interface gets a secondary 806 * address. 807 */ 808 ia->ia_subnetmask != (u_long)0xffffffff) 809 return 1; 810 return (0); 811 #undef ia 812 } 813 /* 814 * Add an address to the list of IP multicast addresses for a given interface. 815 */ 816 struct in_multi * 817 in_addmulti(ap, ifp) 818 struct in_addr *ap; 819 struct ifnet *ifp; 820 { 821 struct in_multi *inm; 822 int error; 823 struct sockaddr_in sin; 824 struct ifmultiaddr *ifma; 825 826 /* 827 * Call generic routine to add membership or increment 828 * refcount. It wants addresses in the form of a sockaddr, 829 * so we build one here (being careful to zero the unused bytes). 830 */ 831 bzero(&sin, sizeof sin); 832 sin.sin_family = AF_INET; 833 sin.sin_len = sizeof sin; 834 sin.sin_addr = *ap; 835 crit_enter(); 836 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 837 if (error) { 838 crit_exit(); 839 return 0; 840 } 841 842 /* 843 * If ifma->ifma_protospec is null, then if_addmulti() created 844 * a new record. Otherwise, we are done. 845 */ 846 if (ifma->ifma_protospec != 0) { 847 crit_exit(); 848 return ifma->ifma_protospec; 849 } 850 851 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 852 at interrupt time? If so, need to fix if_addmulti. XXX */ 853 inm = malloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 854 inm->inm_addr = *ap; 855 inm->inm_ifp = ifp; 856 inm->inm_ifma = ifma; 857 ifma->ifma_protospec = inm; 858 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 859 860 /* 861 * Let IGMP know that we have joined a new IP multicast group. 862 */ 863 igmp_joingroup(inm); 864 crit_exit(); 865 return (inm); 866 } 867 868 /* 869 * Delete a multicast address record. 870 */ 871 void 872 in_delmulti(inm) 873 struct in_multi *inm; 874 { 875 struct ifmultiaddr *ifma; 876 struct in_multi my_inm; 877 878 crit_enter(); 879 ifma = inm->inm_ifma; 880 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 881 if (ifma->ifma_refcount == 1) { 882 /* 883 * No remaining claims to this record; let IGMP know that 884 * we are leaving the multicast group. 885 * But do it after the if_delmulti() which might reset 886 * the interface and nuke the packet. 887 */ 888 my_inm = *inm ; 889 ifma->ifma_protospec = 0; 890 LIST_REMOVE(inm, inm_link); 891 free(inm, M_IPMADDR); 892 } 893 /* XXX - should be separate API for when we have an ifma? */ 894 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 895 if (my_inm.inm_ifp != NULL) 896 igmp_leavegroup(&my_inm); 897 crit_exit(); 898 } 899 900 void 901 in_ifdetach(struct ifnet *ifp) 902 { 903 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 904 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 905 } 906