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 1.15 2005/06/02 23:52:42 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 #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 /* 439 * XXX horrible hack to detect that we are being called 440 * from if_detach() 441 */ 442 if (!ifnet_addrs[ifp->if_index - 1]) { 443 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 444 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 445 } 446 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 447 error = 0; 448 break; 449 450 default: 451 if (ifp == NULL || ifp->if_ioctl == NULL) 452 return (EOPNOTSUPP); 453 return ((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred)); 454 } 455 456 /* 457 * Protect from ipintr() traversing address list while we're modifying 458 * it. 459 */ 460 crit_enter(); 461 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 462 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 463 LIST_REMOVE(ia, ia_hash); 464 IFAFREE(&ia->ia_ifa); 465 crit_exit(); 466 467 return (error); 468 } 469 470 /* 471 * SIOC[GAD]LIFADDR. 472 * SIOCGLIFADDR: get first address. (?!?) 473 * SIOCGLIFADDR with IFLR_PREFIX: 474 * get first address that matches the specified prefix. 475 * SIOCALIFADDR: add the specified address. 476 * SIOCALIFADDR with IFLR_PREFIX: 477 * EINVAL since we can't deduce hostid part of the address. 478 * SIOCDLIFADDR: delete the specified address. 479 * SIOCDLIFADDR with IFLR_PREFIX: 480 * delete the first address that matches the specified prefix. 481 * return values: 482 * EINVAL on invalid parameters 483 * EADDRNOTAVAIL on prefix match failed/specified address not found 484 * other values may be returned from in_ioctl() 485 * 486 * NOTE! td might be NULL. 487 */ 488 static int 489 in_lifaddr_ioctl(so, cmd, data, ifp, td) 490 struct socket *so; 491 u_long cmd; 492 caddr_t data; 493 struct ifnet *ifp; 494 struct thread *td; 495 { 496 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 497 struct ifaddr *ifa; 498 499 /* sanity checks */ 500 if (!data || !ifp) { 501 panic("invalid argument to in_lifaddr_ioctl"); 502 /*NOTRECHED*/ 503 } 504 505 switch (cmd) { 506 case SIOCGLIFADDR: 507 /* address must be specified on GET with IFLR_PREFIX */ 508 if ((iflr->flags & IFLR_PREFIX) == 0) 509 break; 510 /*FALLTHROUGH*/ 511 case SIOCALIFADDR: 512 case SIOCDLIFADDR: 513 /* address must be specified on ADD and DELETE */ 514 if (iflr->addr.ss_family != AF_INET) 515 return EINVAL; 516 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 517 return EINVAL; 518 /* XXX need improvement */ 519 if (iflr->dstaddr.ss_family 520 && iflr->dstaddr.ss_family != AF_INET) 521 return EINVAL; 522 if (iflr->dstaddr.ss_family 523 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 524 return EINVAL; 525 break; 526 default: /*shouldn't happen*/ 527 return EOPNOTSUPP; 528 } 529 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 530 return EINVAL; 531 532 switch (cmd) { 533 case SIOCALIFADDR: 534 { 535 struct in_aliasreq ifra; 536 537 if (iflr->flags & IFLR_PREFIX) 538 return EINVAL; 539 540 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 541 bzero(&ifra, sizeof ifra); 542 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 543 544 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 545 546 if (iflr->dstaddr.ss_family) { /*XXX*/ 547 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 548 iflr->dstaddr.ss_len); 549 } 550 551 ifra.ifra_mask.sin_family = AF_INET; 552 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 553 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 554 555 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 556 } 557 case SIOCGLIFADDR: 558 case SIOCDLIFADDR: 559 { 560 struct in_ifaddr *ia; 561 struct in_addr mask, candidate, match; 562 struct sockaddr_in *sin; 563 int cmp; 564 565 bzero(&mask, sizeof mask); 566 if (iflr->flags & IFLR_PREFIX) { 567 /* lookup a prefix rather than address. */ 568 in_len2mask(&mask, iflr->prefixlen); 569 570 sin = (struct sockaddr_in *)&iflr->addr; 571 match.s_addr = sin->sin_addr.s_addr; 572 match.s_addr &= mask.s_addr; 573 574 /* if you set extra bits, that's wrong */ 575 if (match.s_addr != sin->sin_addr.s_addr) 576 return EINVAL; 577 578 cmp = 1; 579 } else { 580 if (cmd == SIOCGLIFADDR) { 581 /* on getting an address, take the 1st match */ 582 cmp = 0; /*XXX*/ 583 } else { 584 /* on deleting an address, do exact match */ 585 in_len2mask(&mask, 32); 586 sin = (struct sockaddr_in *)&iflr->addr; 587 match.s_addr = sin->sin_addr.s_addr; 588 589 cmp = 1; 590 } 591 } 592 593 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 594 if (ifa->ifa_addr->sa_family != AF_INET6) 595 continue; 596 if (!cmp) 597 break; 598 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 599 candidate.s_addr &= mask.s_addr; 600 if (candidate.s_addr == match.s_addr) 601 break; 602 } 603 if (!ifa) 604 return EADDRNOTAVAIL; 605 ia = (struct in_ifaddr *)ifa; 606 607 if (cmd == SIOCGLIFADDR) { 608 /* fill in the if_laddrreq structure */ 609 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 610 611 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 612 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 613 ia->ia_dstaddr.sin_len); 614 } else 615 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 616 617 iflr->prefixlen = 618 in_mask2len(&ia->ia_sockmask.sin_addr); 619 620 iflr->flags = 0; /*XXX*/ 621 622 return 0; 623 } else { 624 struct in_aliasreq ifra; 625 626 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 627 bzero(&ifra, sizeof ifra); 628 bcopy(iflr->iflr_name, ifra.ifra_name, 629 sizeof ifra.ifra_name); 630 631 bcopy(&ia->ia_addr, &ifra.ifra_addr, 632 ia->ia_addr.sin_len); 633 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 634 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 635 ia->ia_dstaddr.sin_len); 636 } 637 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 638 ia->ia_sockmask.sin_len); 639 640 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 641 ifp, td); 642 } 643 } 644 } 645 646 return EOPNOTSUPP; /*just for safety*/ 647 } 648 649 /* 650 * Delete any existing route for an interface. 651 */ 652 void 653 in_ifscrub(ifp, ia) 654 struct ifnet *ifp; 655 struct in_ifaddr *ia; 656 { 657 658 if ((ia->ia_flags & IFA_ROUTE) == 0) 659 return; 660 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 661 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 662 else 663 rtinit(&ia->ia_ifa, RTM_DELETE, 0); 664 ia->ia_flags &= ~IFA_ROUTE; 665 } 666 667 /* 668 * Initialize an interface's internet address 669 * and routing table entry. 670 */ 671 static int 672 in_ifinit(ifp, ia, sin, scrub) 673 struct ifnet *ifp; 674 struct in_ifaddr *ia; 675 struct sockaddr_in *sin; 676 int scrub; 677 { 678 u_long i = ntohl(sin->sin_addr.s_addr); 679 struct sockaddr_in oldaddr; 680 int flags = RTF_UP, error = 0; 681 682 crit_enter(); 683 684 oldaddr = ia->ia_addr; 685 if (oldaddr.sin_family == AF_INET) 686 LIST_REMOVE(ia, ia_hash); 687 ia->ia_addr = *sin; 688 if (ia->ia_addr.sin_family == AF_INET) 689 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 690 ia, ia_hash); 691 /* 692 * Give the interface a chance to initialize 693 * if this is its first address, 694 * and to validate the address if necessary. 695 */ 696 if (ifp->if_ioctl && 697 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia, 698 (struct ucred *)NULL))) { 699 crit_exit(); 700 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 701 ia->ia_addr = oldaddr; 702 if (ia->ia_addr.sin_family == AF_INET) 703 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 704 ia, ia_hash); 705 return (error); 706 } 707 crit_exit(); 708 if (scrub) { 709 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 710 in_ifscrub(ifp, ia); 711 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 712 } 713 if (IN_CLASSA(i)) 714 ia->ia_netmask = IN_CLASSA_NET; 715 else if (IN_CLASSB(i)) 716 ia->ia_netmask = IN_CLASSB_NET; 717 else 718 ia->ia_netmask = IN_CLASSC_NET; 719 /* 720 * The subnet mask usually includes at least the standard network part, 721 * but may may be smaller in the case of supernetting. 722 * If it is set, we believe it. 723 */ 724 if (ia->ia_subnetmask == 0) { 725 ia->ia_subnetmask = ia->ia_netmask; 726 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 727 } else 728 ia->ia_netmask &= ia->ia_subnetmask; 729 ia->ia_net = i & ia->ia_netmask; 730 ia->ia_subnet = i & ia->ia_subnetmask; 731 in_socktrim(&ia->ia_sockmask); 732 /* 733 * Add route for the network. 734 */ 735 ia->ia_ifa.ifa_metric = ifp->if_metric; 736 if (ifp->if_flags & IFF_BROADCAST) { 737 ia->ia_broadaddr.sin_addr.s_addr = 738 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 739 ia->ia_netbroadcast.s_addr = 740 htonl(ia->ia_net | ~ ia->ia_netmask); 741 } else if (ifp->if_flags & IFF_LOOPBACK) { 742 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 743 flags |= RTF_HOST; 744 } else if (ifp->if_flags & IFF_POINTOPOINT) { 745 if (ia->ia_dstaddr.sin_family != AF_INET) 746 return (0); 747 flags |= RTF_HOST; 748 } 749 750 /*- 751 * Don't add host routes for interface addresses of 752 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 753 * possible to assign several such address pairs with consistent 754 * results (no host route) and is required by BOOTP. 755 * 756 * XXX: This is ugly ! There should be a way for the caller to 757 * say that they don't want a host route. 758 */ 759 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 760 ia->ia_netmask != IN_CLASSA_NET || 761 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 762 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 763 ia->ia_addr = oldaddr; 764 return (error); 765 } 766 ia->ia_flags |= IFA_ROUTE; 767 } 768 769 /* 770 * If the interface supports multicast, join the "all hosts" 771 * multicast group on that interface. 772 */ 773 if (ifp->if_flags & IFF_MULTICAST) { 774 struct in_addr addr; 775 776 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 777 in_addmulti(&addr, ifp); 778 } 779 return (error); 780 } 781 782 783 /* 784 * Return 1 if the address might be a local broadcast address. 785 */ 786 int 787 in_broadcast(struct in_addr in, struct ifnet *ifp) 788 { 789 struct ifaddr *ifa; 790 u_long t; 791 792 if (in.s_addr == INADDR_BROADCAST || 793 in.s_addr == INADDR_ANY) 794 return 1; 795 if ((ifp->if_flags & IFF_BROADCAST) == 0) 796 return 0; 797 t = ntohl(in.s_addr); 798 /* 799 * Look through the list of addresses for a match 800 * with a broadcast address. 801 */ 802 #define ia ((struct in_ifaddr *)ifa) 803 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 804 if (ifa->ifa_addr->sa_family == AF_INET && 805 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 806 in.s_addr == ia->ia_netbroadcast.s_addr || 807 /* 808 * Check for old-style (host 0) broadcast. 809 */ 810 t == ia->ia_subnet || t == ia->ia_net) && 811 /* 812 * Check for an all one subnetmask. These 813 * only exist when an interface gets a secondary 814 * address. 815 */ 816 ia->ia_subnetmask != (u_long)0xffffffff) 817 return 1; 818 return (0); 819 #undef ia 820 } 821 /* 822 * Add an address to the list of IP multicast addresses for a given interface. 823 */ 824 struct in_multi * 825 in_addmulti(ap, ifp) 826 struct in_addr *ap; 827 struct ifnet *ifp; 828 { 829 struct in_multi *inm; 830 int error; 831 struct sockaddr_in sin; 832 struct ifmultiaddr *ifma; 833 834 /* 835 * Call generic routine to add membership or increment 836 * refcount. It wants addresses in the form of a sockaddr, 837 * so we build one here (being careful to zero the unused bytes). 838 */ 839 bzero(&sin, sizeof sin); 840 sin.sin_family = AF_INET; 841 sin.sin_len = sizeof sin; 842 sin.sin_addr = *ap; 843 crit_enter(); 844 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 845 if (error) { 846 crit_exit(); 847 return 0; 848 } 849 850 /* 851 * If ifma->ifma_protospec is null, then if_addmulti() created 852 * a new record. Otherwise, we are done. 853 */ 854 if (ifma->ifma_protospec != 0) { 855 crit_exit(); 856 return ifma->ifma_protospec; 857 } 858 859 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 860 at interrupt time? If so, need to fix if_addmulti. XXX */ 861 inm = malloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 862 inm->inm_addr = *ap; 863 inm->inm_ifp = ifp; 864 inm->inm_ifma = ifma; 865 ifma->ifma_protospec = inm; 866 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 867 868 /* 869 * Let IGMP know that we have joined a new IP multicast group. 870 */ 871 igmp_joingroup(inm); 872 crit_exit(); 873 return (inm); 874 } 875 876 /* 877 * Delete a multicast address record. 878 */ 879 void 880 in_delmulti(inm) 881 struct in_multi *inm; 882 { 883 struct ifmultiaddr *ifma; 884 struct in_multi my_inm; 885 886 crit_enter(); 887 ifma = inm->inm_ifma; 888 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 889 if (ifma->ifma_refcount == 1) { 890 /* 891 * No remaining claims to this record; let IGMP know that 892 * we are leaving the multicast group. 893 * But do it after the if_delmulti() which might reset 894 * the interface and nuke the packet. 895 */ 896 my_inm = *inm ; 897 ifma->ifma_protospec = 0; 898 LIST_REMOVE(inm, inm_link); 899 free(inm, M_IPMADDR); 900 } 901 /* XXX - should be separate API for when we have an ifma? */ 902 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 903 if (my_inm.inm_ifp != NULL) 904 igmp_leavegroup(&my_inm); 905 crit_exit(); 906 } 907