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 * $FreeBSD$ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/sockio.h> 40 #include <sys/malloc.h> 41 #include <sys/socket.h> 42 #include <sys/kernel.h> 43 #include <sys/sysctl.h> 44 45 #include <net/if.h> 46 #include <net/if_types.h> 47 #include <net/route.h> 48 49 #include <netinet/in.h> 50 #include <netinet/in_var.h> 51 #include <netinet/in_pcb.h> 52 53 #include <netinet/igmp_var.h> 54 55 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 56 57 static int in_mask2len(struct in_addr *); 58 static void in_len2mask(struct in_addr *, int); 59 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 60 struct ifnet *, struct thread *); 61 62 static void in_socktrim(struct sockaddr_in *); 63 static int in_ifinit(struct ifnet *, 64 struct in_ifaddr *, struct sockaddr_in *, int); 65 66 static int subnetsarelocal = 0; 67 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 68 &subnetsarelocal, 0, ""); 69 70 struct in_multihead in_multihead; /* XXX BSS initialization */ 71 72 extern struct inpcbinfo ripcbinfo; 73 extern struct inpcbinfo udbinfo; 74 75 /* 76 * Return 1 if an internet address is for a ``local'' host 77 * (one to which we have a connection). If subnetsarelocal 78 * is true, this includes other subnets of the local net. 79 * Otherwise, it includes only the directly-connected (sub)nets. 80 */ 81 int 82 in_localaddr(in) 83 struct in_addr in; 84 { 85 register u_long i = ntohl(in.s_addr); 86 register struct in_ifaddr *ia; 87 88 if (subnetsarelocal) { 89 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 90 if ((i & ia->ia_netmask) == ia->ia_net) 91 return (1); 92 } else { 93 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 94 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 95 return (1); 96 } 97 return (0); 98 } 99 100 /* 101 * Determine whether an IP address is in a reserved set of addresses 102 * that may not be forwarded, or whether datagrams to that destination 103 * may be forwarded. 104 */ 105 int 106 in_canforward(in) 107 struct in_addr in; 108 { 109 register u_long i = ntohl(in.s_addr); 110 register u_long net; 111 112 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 113 return (0); 114 if (IN_CLASSA(i)) { 115 net = i & IN_CLASSA_NET; 116 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 117 return (0); 118 } 119 return (1); 120 } 121 122 /* 123 * Trim a mask in a sockaddr 124 */ 125 static void 126 in_socktrim(ap) 127 struct sockaddr_in *ap; 128 { 129 register char *cplim = (char *) &ap->sin_addr; 130 register char *cp = (char *) (&ap->sin_addr + 1); 131 132 ap->sin_len = 0; 133 while (--cp >= cplim) 134 if (*cp) { 135 (ap)->sin_len = cp - (char *) (ap) + 1; 136 break; 137 } 138 } 139 140 static int 141 in_mask2len(mask) 142 struct in_addr *mask; 143 { 144 int x, y; 145 u_char *p; 146 147 p = (u_char *)mask; 148 for (x = 0; x < sizeof(*mask); x++) { 149 if (p[x] != 0xff) 150 break; 151 } 152 y = 0; 153 if (x < sizeof(*mask)) { 154 for (y = 0; y < 8; y++) { 155 if ((p[x] & (0x80 >> y)) == 0) 156 break; 157 } 158 } 159 return x * 8 + y; 160 } 161 162 static void 163 in_len2mask(mask, len) 164 struct in_addr *mask; 165 int len; 166 { 167 int i; 168 u_char *p; 169 170 p = (u_char *)mask; 171 bzero(mask, sizeof(*mask)); 172 for (i = 0; i < len / 8; i++) 173 p[i] = 0xff; 174 if (len % 8) 175 p[i] = (0xff00 >> (len % 8)) & 0xff; 176 } 177 178 /* 179 * Generic internet control operations (ioctl's). 180 * Ifp is 0 if not an interface-specific ioctl. 181 */ 182 /* ARGSUSED */ 183 int 184 in_control(so, cmd, data, ifp, td) 185 struct socket *so; 186 u_long cmd; 187 caddr_t data; 188 register struct ifnet *ifp; 189 struct thread *td; 190 { 191 register struct ifreq *ifr = (struct ifreq *)data; 192 register struct in_ifaddr *ia = 0, *iap; 193 register struct ifaddr *ifa; 194 struct in_addr dst; 195 struct in_ifaddr *oia; 196 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 197 struct sockaddr_in oldaddr; 198 int error, hostIsNew, iaIsNew, maskIsNew, s; 199 200 iaIsNew = 0; 201 202 switch (cmd) { 203 case SIOCALIFADDR: 204 case SIOCDLIFADDR: 205 if (td && (error = suser(td)) != 0) 206 return error; 207 /*fall through*/ 208 case SIOCGLIFADDR: 209 if (!ifp) 210 return EINVAL; 211 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 212 } 213 214 /* 215 * Find address for this interface, if it exists. 216 * 217 * If an alias address was specified, find that one instead of 218 * the first one on the interface, if possible. 219 */ 220 if (ifp) { 221 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 222 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 223 if (iap->ia_ifp == ifp && 224 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 225 ia = iap; 226 break; 227 } 228 if (ia == NULL) 229 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 230 iap = ifatoia(ifa); 231 if (iap->ia_addr.sin_family == AF_INET) { 232 ia = iap; 233 break; 234 } 235 } 236 } 237 238 switch (cmd) { 239 240 case SIOCAIFADDR: 241 case SIOCDIFADDR: 242 if (ifp == 0) 243 return (EADDRNOTAVAIL); 244 if (ifra->ifra_addr.sin_family == AF_INET) { 245 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 246 if (ia->ia_ifp == ifp && 247 ia->ia_addr.sin_addr.s_addr == 248 ifra->ifra_addr.sin_addr.s_addr) 249 break; 250 } 251 if ((ifp->if_flags & IFF_POINTOPOINT) 252 && (cmd == SIOCAIFADDR) 253 && (ifra->ifra_dstaddr.sin_addr.s_addr 254 == INADDR_ANY)) { 255 return EDESTADDRREQ; 256 } 257 } 258 if (cmd == SIOCDIFADDR && ia == 0) 259 return (EADDRNOTAVAIL); 260 /* FALLTHROUGH */ 261 case SIOCSIFADDR: 262 case SIOCSIFNETMASK: 263 case SIOCSIFDSTADDR: 264 if (td && (error = suser(td)) != 0) 265 return error; 266 267 if (ifp == 0) 268 return (EADDRNOTAVAIL); 269 if (ia == (struct in_ifaddr *)0) { 270 ia = (struct in_ifaddr *) 271 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 272 if (ia == (struct in_ifaddr *)NULL) 273 return (ENOBUFS); 274 /* 275 * Protect from ipintr() traversing address list 276 * while we're modifying it. 277 */ 278 s = splnet(); 279 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 280 281 ifa = &ia->ia_ifa; 282 IFA_LOCK_INIT(ifa); 283 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 284 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 285 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 286 ifa->ifa_refcnt = 1; 287 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 288 289 ia->ia_sockmask.sin_len = 8; 290 ia->ia_sockmask.sin_family = AF_INET; 291 if (ifp->if_flags & IFF_BROADCAST) { 292 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 293 ia->ia_broadaddr.sin_family = AF_INET; 294 } 295 ia->ia_ifp = ifp; 296 splx(s); 297 iaIsNew = 1; 298 } 299 break; 300 301 case SIOCSIFBRDADDR: 302 if (td && (error = suser(td)) != 0) 303 return error; 304 /* FALLTHROUGH */ 305 306 case SIOCGIFADDR: 307 case SIOCGIFNETMASK: 308 case SIOCGIFDSTADDR: 309 case SIOCGIFBRDADDR: 310 if (ia == (struct in_ifaddr *)0) 311 return (EADDRNOTAVAIL); 312 break; 313 } 314 switch (cmd) { 315 316 case SIOCGIFADDR: 317 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 318 return (0); 319 320 case SIOCGIFBRDADDR: 321 if ((ifp->if_flags & IFF_BROADCAST) == 0) 322 return (EINVAL); 323 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 324 return (0); 325 326 case SIOCGIFDSTADDR: 327 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 328 return (EINVAL); 329 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 330 return (0); 331 332 case SIOCGIFNETMASK: 333 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 334 return (0); 335 336 case SIOCSIFDSTADDR: 337 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 338 return (EINVAL); 339 oldaddr = ia->ia_dstaddr; 340 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 341 if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 342 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 343 ia->ia_dstaddr = oldaddr; 344 return (error); 345 } 346 if (ia->ia_flags & IFA_ROUTE) { 347 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 348 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 349 ia->ia_ifa.ifa_dstaddr = 350 (struct sockaddr *)&ia->ia_dstaddr; 351 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 352 } 353 return (0); 354 355 case SIOCSIFBRDADDR: 356 if ((ifp->if_flags & IFF_BROADCAST) == 0) 357 return (EINVAL); 358 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 359 return (0); 360 361 case SIOCSIFADDR: 362 error = in_ifinit(ifp, ia, 363 (struct sockaddr_in *) &ifr->ifr_addr, 1); 364 if (error != 0 && iaIsNew) 365 break; 366 return (0); 367 368 case SIOCSIFNETMASK: 369 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 370 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 371 return (0); 372 373 case SIOCAIFADDR: 374 maskIsNew = 0; 375 hostIsNew = 1; 376 error = 0; 377 if (ia->ia_addr.sin_family == AF_INET) { 378 if (ifra->ifra_addr.sin_len == 0) { 379 ifra->ifra_addr = ia->ia_addr; 380 hostIsNew = 0; 381 } else if (ifra->ifra_addr.sin_addr.s_addr == 382 ia->ia_addr.sin_addr.s_addr) 383 hostIsNew = 0; 384 } 385 if (ifra->ifra_mask.sin_len) { 386 in_ifscrub(ifp, ia); 387 ia->ia_sockmask = ifra->ifra_mask; 388 ia->ia_sockmask.sin_family = AF_INET; 389 ia->ia_subnetmask = 390 ntohl(ia->ia_sockmask.sin_addr.s_addr); 391 maskIsNew = 1; 392 } 393 if ((ifp->if_flags & IFF_POINTOPOINT) && 394 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 395 in_ifscrub(ifp, ia); 396 ia->ia_dstaddr = ifra->ifra_dstaddr; 397 maskIsNew = 1; /* We lie; but the effect's the same */ 398 } 399 if (ifra->ifra_addr.sin_family == AF_INET && 400 (hostIsNew || maskIsNew)) 401 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 402 if (error != 0 && iaIsNew) 403 break; 404 405 if ((ifp->if_flags & IFF_BROADCAST) && 406 (ifra->ifra_broadaddr.sin_family == AF_INET)) 407 ia->ia_broadaddr = ifra->ifra_broadaddr; 408 return (error); 409 410 case SIOCDIFADDR: 411 /* 412 * in_ifscrub kills the interface route. 413 */ 414 in_ifscrub(ifp, ia); 415 /* 416 * in_ifadown gets rid of all the rest of 417 * the routes. This is not quite the right 418 * thing to do, but at least if we are running 419 * a routing process they will come back. 420 */ 421 in_ifadown(&ia->ia_ifa, 1); 422 /* 423 * XXX horrible hack to detect that we are being called 424 * from if_detach() 425 */ 426 if (ifaddr_byindex(ifp->if_index) != NULL) { 427 in_pcbpurgeif0(&ripcbinfo, ifp); 428 in_pcbpurgeif0(&udbinfo, ifp); 429 } 430 error = 0; 431 break; 432 433 default: 434 if (ifp == 0 || ifp->if_ioctl == 0) 435 return (EOPNOTSUPP); 436 return ((*ifp->if_ioctl)(ifp, cmd, data)); 437 } 438 439 /* 440 * Protect from ipintr() traversing address list while we're modifying 441 * it. 442 */ 443 s = splnet(); 444 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 445 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 446 LIST_REMOVE(ia, ia_hash); 447 IFAFREE(&ia->ia_ifa); 448 splx(s); 449 450 return (error); 451 } 452 453 /* 454 * SIOC[GAD]LIFADDR. 455 * SIOCGLIFADDR: get first address. (?!?) 456 * SIOCGLIFADDR with IFLR_PREFIX: 457 * get first address that matches the specified prefix. 458 * SIOCALIFADDR: add the specified address. 459 * SIOCALIFADDR with IFLR_PREFIX: 460 * EINVAL since we can't deduce hostid part of the address. 461 * SIOCDLIFADDR: delete the specified address. 462 * SIOCDLIFADDR with IFLR_PREFIX: 463 * delete the first address that matches the specified prefix. 464 * return values: 465 * EINVAL on invalid parameters 466 * EADDRNOTAVAIL on prefix match failed/specified address not found 467 * other values may be returned from in_ioctl() 468 */ 469 static int 470 in_lifaddr_ioctl(so, cmd, data, ifp, td) 471 struct socket *so; 472 u_long cmd; 473 caddr_t data; 474 struct ifnet *ifp; 475 struct thread *td; 476 { 477 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 478 struct ifaddr *ifa; 479 480 /* sanity checks */ 481 if (!data || !ifp) { 482 panic("invalid argument to in_lifaddr_ioctl"); 483 /*NOTRECHED*/ 484 } 485 486 switch (cmd) { 487 case SIOCGLIFADDR: 488 /* address must be specified on GET with IFLR_PREFIX */ 489 if ((iflr->flags & IFLR_PREFIX) == 0) 490 break; 491 /*FALLTHROUGH*/ 492 case SIOCALIFADDR: 493 case SIOCDLIFADDR: 494 /* address must be specified on ADD and DELETE */ 495 if (iflr->addr.ss_family != AF_INET) 496 return EINVAL; 497 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 498 return EINVAL; 499 /* XXX need improvement */ 500 if (iflr->dstaddr.ss_family 501 && iflr->dstaddr.ss_family != AF_INET) 502 return EINVAL; 503 if (iflr->dstaddr.ss_family 504 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 505 return EINVAL; 506 break; 507 default: /*shouldn't happen*/ 508 return EOPNOTSUPP; 509 } 510 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 511 return EINVAL; 512 513 switch (cmd) { 514 case SIOCALIFADDR: 515 { 516 struct in_aliasreq ifra; 517 518 if (iflr->flags & IFLR_PREFIX) 519 return EINVAL; 520 521 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 522 bzero(&ifra, sizeof(ifra)); 523 bcopy(iflr->iflr_name, ifra.ifra_name, 524 sizeof(ifra.ifra_name)); 525 526 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 527 528 if (iflr->dstaddr.ss_family) { /*XXX*/ 529 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 530 iflr->dstaddr.ss_len); 531 } 532 533 ifra.ifra_mask.sin_family = AF_INET; 534 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 535 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 536 537 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 538 } 539 case SIOCGLIFADDR: 540 case SIOCDLIFADDR: 541 { 542 struct in_ifaddr *ia; 543 struct in_addr mask, candidate, match; 544 struct sockaddr_in *sin; 545 int cmp; 546 547 bzero(&mask, sizeof(mask)); 548 if (iflr->flags & IFLR_PREFIX) { 549 /* lookup a prefix rather than address. */ 550 in_len2mask(&mask, iflr->prefixlen); 551 552 sin = (struct sockaddr_in *)&iflr->addr; 553 match.s_addr = sin->sin_addr.s_addr; 554 match.s_addr &= mask.s_addr; 555 556 /* if you set extra bits, that's wrong */ 557 if (match.s_addr != sin->sin_addr.s_addr) 558 return EINVAL; 559 560 cmp = 1; 561 } else { 562 if (cmd == SIOCGLIFADDR) { 563 /* on getting an address, take the 1st match */ 564 cmp = 0; /*XXX*/ 565 } else { 566 /* on deleting an address, do exact match */ 567 in_len2mask(&mask, 32); 568 sin = (struct sockaddr_in *)&iflr->addr; 569 match.s_addr = sin->sin_addr.s_addr; 570 571 cmp = 1; 572 } 573 } 574 575 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 576 if (ifa->ifa_addr->sa_family != AF_INET6) 577 continue; 578 if (!cmp) 579 break; 580 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 581 candidate.s_addr &= mask.s_addr; 582 if (candidate.s_addr == match.s_addr) 583 break; 584 } 585 if (!ifa) 586 return EADDRNOTAVAIL; 587 ia = (struct in_ifaddr *)ifa; 588 589 if (cmd == SIOCGLIFADDR) { 590 /* fill in the if_laddrreq structure */ 591 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 592 593 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 594 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 595 ia->ia_dstaddr.sin_len); 596 } else 597 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 598 599 iflr->prefixlen = 600 in_mask2len(&ia->ia_sockmask.sin_addr); 601 602 iflr->flags = 0; /*XXX*/ 603 604 return 0; 605 } else { 606 struct in_aliasreq ifra; 607 608 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 609 bzero(&ifra, sizeof(ifra)); 610 bcopy(iflr->iflr_name, ifra.ifra_name, 611 sizeof(ifra.ifra_name)); 612 613 bcopy(&ia->ia_addr, &ifra.ifra_addr, 614 ia->ia_addr.sin_len); 615 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 616 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 617 ia->ia_dstaddr.sin_len); 618 } 619 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 620 ia->ia_sockmask.sin_len); 621 622 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 623 ifp, td); 624 } 625 } 626 } 627 628 return EOPNOTSUPP; /*just for safety*/ 629 } 630 631 /* 632 * Delete any existing route for an interface. 633 */ 634 void 635 in_ifscrub(ifp, ia) 636 register struct ifnet *ifp; 637 register struct in_ifaddr *ia; 638 { 639 640 if ((ia->ia_flags & IFA_ROUTE) == 0) 641 return; 642 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 643 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 644 else 645 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 646 ia->ia_flags &= ~IFA_ROUTE; 647 } 648 649 /* 650 * Initialize an interface's internet address 651 * and routing table entry. 652 */ 653 static int 654 in_ifinit(ifp, ia, sin, scrub) 655 register struct ifnet *ifp; 656 register struct in_ifaddr *ia; 657 struct sockaddr_in *sin; 658 int scrub; 659 { 660 register u_long i = ntohl(sin->sin_addr.s_addr); 661 struct sockaddr_in oldaddr; 662 int s = splimp(), flags = RTF_UP, error = 0; 663 664 oldaddr = ia->ia_addr; 665 if (oldaddr.sin_family == AF_INET) 666 LIST_REMOVE(ia, ia_hash); 667 ia->ia_addr = *sin; 668 if (ia->ia_addr.sin_family == AF_INET) 669 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 670 ia, ia_hash); 671 /* 672 * Give the interface a chance to initialize 673 * if this is its first address, 674 * and to validate the address if necessary. 675 */ 676 if (ifp->if_ioctl && 677 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 678 splx(s); 679 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 680 ia->ia_addr = oldaddr; 681 if (ia->ia_addr.sin_family == AF_INET) 682 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 683 ia, ia_hash); 684 return (error); 685 } 686 splx(s); 687 if (scrub) { 688 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 689 in_ifscrub(ifp, ia); 690 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 691 } 692 if (IN_CLASSA(i)) 693 ia->ia_netmask = IN_CLASSA_NET; 694 else if (IN_CLASSB(i)) 695 ia->ia_netmask = IN_CLASSB_NET; 696 else 697 ia->ia_netmask = IN_CLASSC_NET; 698 /* 699 * The subnet mask usually includes at least the standard network part, 700 * but may may be smaller in the case of supernetting. 701 * If it is set, we believe it. 702 */ 703 if (ia->ia_subnetmask == 0) { 704 ia->ia_subnetmask = ia->ia_netmask; 705 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 706 } else 707 ia->ia_netmask &= ia->ia_subnetmask; 708 ia->ia_net = i & ia->ia_netmask; 709 ia->ia_subnet = i & ia->ia_subnetmask; 710 in_socktrim(&ia->ia_sockmask); 711 /* 712 * Add route for the network. 713 */ 714 ia->ia_ifa.ifa_metric = ifp->if_metric; 715 if (ifp->if_flags & IFF_BROADCAST) { 716 ia->ia_broadaddr.sin_addr.s_addr = 717 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 718 ia->ia_netbroadcast.s_addr = 719 htonl(ia->ia_net | ~ ia->ia_netmask); 720 } else if (ifp->if_flags & IFF_LOOPBACK) { 721 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 722 flags |= RTF_HOST; 723 } else if (ifp->if_flags & IFF_POINTOPOINT) { 724 if (ia->ia_dstaddr.sin_family != AF_INET) 725 return (0); 726 flags |= RTF_HOST; 727 } 728 729 /*- 730 * Don't add host routes for interface addresses of 731 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 732 * possible to assign several such address pairs with consistent 733 * results (no host route) and is required by BOOTP. 734 * 735 * XXX: This is ugly ! There should be a way for the caller to 736 * say that they don't want a host route. 737 */ 738 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 739 ia->ia_netmask != IN_CLASSA_NET || 740 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 741 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 742 ia->ia_addr = oldaddr; 743 return (error); 744 } 745 ia->ia_flags |= IFA_ROUTE; 746 } 747 748 /* 749 * If the interface supports multicast, join the "all hosts" 750 * multicast group on that interface. 751 */ 752 if (ifp->if_flags & IFF_MULTICAST) { 753 struct in_addr addr; 754 755 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 756 in_addmulti(&addr, ifp); 757 } 758 return (error); 759 } 760 761 762 /* 763 * Return 1 if the address might be a local broadcast address. 764 */ 765 int 766 in_broadcast(in, ifp) 767 struct in_addr in; 768 struct ifnet *ifp; 769 { 770 register struct ifaddr *ifa; 771 u_long t; 772 773 if (in.s_addr == INADDR_BROADCAST || 774 in.s_addr == INADDR_ANY) 775 return 1; 776 if ((ifp->if_flags & IFF_BROADCAST) == 0) 777 return 0; 778 t = ntohl(in.s_addr); 779 /* 780 * Look through the list of addresses for a match 781 * with a broadcast address. 782 */ 783 #define ia ((struct in_ifaddr *)ifa) 784 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 785 if (ifa->ifa_addr->sa_family == AF_INET && 786 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 787 in.s_addr == ia->ia_netbroadcast.s_addr || 788 /* 789 * Check for old-style (host 0) broadcast. 790 */ 791 t == ia->ia_subnet || t == ia->ia_net) && 792 /* 793 * Check for an all one subnetmask. These 794 * only exist when an interface gets a secondary 795 * address. 796 */ 797 ia->ia_subnetmask != (u_long)0xffffffff) 798 return 1; 799 return (0); 800 #undef ia 801 } 802 /* 803 * Add an address to the list of IP multicast addresses for a given interface. 804 */ 805 struct in_multi * 806 in_addmulti(ap, ifp) 807 register struct in_addr *ap; 808 register struct ifnet *ifp; 809 { 810 register struct in_multi *inm; 811 int error; 812 struct sockaddr_in sin; 813 struct ifmultiaddr *ifma; 814 int s = splnet(); 815 816 /* 817 * Call generic routine to add membership or increment 818 * refcount. It wants addresses in the form of a sockaddr, 819 * so we build one here (being careful to zero the unused bytes). 820 */ 821 bzero(&sin, sizeof sin); 822 sin.sin_family = AF_INET; 823 sin.sin_len = sizeof sin; 824 sin.sin_addr = *ap; 825 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 826 if (error) { 827 splx(s); 828 return 0; 829 } 830 831 /* 832 * If ifma->ifma_protospec is null, then if_addmulti() created 833 * a new record. Otherwise, we are done. 834 */ 835 if (ifma->ifma_protospec != 0) { 836 splx(s); 837 return ifma->ifma_protospec; 838 } 839 840 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 841 at interrupt time? If so, need to fix if_addmulti. XXX */ 842 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, 843 M_NOWAIT | M_ZERO); 844 if (inm == NULL) { 845 splx(s); 846 return (NULL); 847 } 848 849 inm->inm_addr = *ap; 850 inm->inm_ifp = ifp; 851 inm->inm_ifma = ifma; 852 ifma->ifma_protospec = inm; 853 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 854 855 /* 856 * Let IGMP know that we have joined a new IP multicast group. 857 */ 858 igmp_joingroup(inm); 859 splx(s); 860 return (inm); 861 } 862 863 /* 864 * Delete a multicast address record. 865 */ 866 void 867 in_delmulti(inm) 868 register struct in_multi *inm; 869 { 870 struct ifmultiaddr *ifma = inm->inm_ifma; 871 struct in_multi my_inm; 872 int s = splnet(); 873 874 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 875 if (ifma->ifma_refcount == 1) { 876 /* 877 * No remaining claims to this record; let IGMP know that 878 * we are leaving the multicast group. 879 * But do it after the if_delmulti() which might reset 880 * the interface and nuke the packet. 881 */ 882 my_inm = *inm ; 883 ifma->ifma_protospec = 0; 884 LIST_REMOVE(inm, inm_link); 885 free(inm, M_IPMADDR); 886 } 887 /* XXX - should be separate API for when we have an ifma? */ 888 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 889 if (my_inm.inm_ifp != NULL) 890 igmp_leavegroup(&my_inm); 891 splx(s); 892 } 893