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 __P((struct in_addr *)); 58 static void in_len2mask __P((struct in_addr *, int)); 59 static int in_lifaddr_ioctl __P((struct socket *, u_long, caddr_t, 60 struct ifnet *, struct thread *)); 61 62 static void in_socktrim __P((struct sockaddr_in *)); 63 static int in_ifinit __P((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 static int in_interfaces; /* number of external internet interfaces */ 179 180 /* 181 * Generic internet control operations (ioctl's). 182 * Ifp is 0 if not an interface-specific ioctl. 183 */ 184 /* ARGSUSED */ 185 int 186 in_control(so, cmd, data, ifp, td) 187 struct socket *so; 188 u_long cmd; 189 caddr_t data; 190 register struct ifnet *ifp; 191 struct thread *td; 192 { 193 register struct ifreq *ifr = (struct ifreq *)data; 194 register struct in_ifaddr *ia = 0, *iap; 195 register struct ifaddr *ifa; 196 struct in_addr dst; 197 struct in_ifaddr *oia; 198 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 199 struct sockaddr_in oldaddr; 200 int error, hostIsNew, maskIsNew, s; 201 202 switch (cmd) { 203 case SIOCALIFADDR: 204 case SIOCDLIFADDR: 205 if (td && (error = suser_td(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(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(); 279 280 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 281 ifa = &ia->ia_ifa; 282 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 283 284 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 285 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 286 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 287 ia->ia_sockmask.sin_len = 8; 288 ia->ia_sockmask.sin_family = AF_INET; 289 if (ifp->if_flags & IFF_BROADCAST) { 290 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 291 ia->ia_broadaddr.sin_family = AF_INET; 292 } 293 ia->ia_ifp = ifp; 294 if (!(ifp->if_flags & IFF_LOOPBACK)) 295 in_interfaces++; 296 splx(s); 297 } 298 break; 299 300 case SIOCSIFBRDADDR: 301 if (td && (error = suser_td(td)) != 0) 302 return error; 303 /* FALLTHROUGH */ 304 305 case SIOCGIFADDR: 306 case SIOCGIFNETMASK: 307 case SIOCGIFDSTADDR: 308 case SIOCGIFBRDADDR: 309 if (ia == (struct in_ifaddr *)0) 310 return (EADDRNOTAVAIL); 311 break; 312 } 313 switch (cmd) { 314 315 case SIOCGIFADDR: 316 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 317 break; 318 319 case SIOCGIFBRDADDR: 320 if ((ifp->if_flags & IFF_BROADCAST) == 0) 321 return (EINVAL); 322 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 323 break; 324 325 case SIOCGIFDSTADDR: 326 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 327 return (EINVAL); 328 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 329 break; 330 331 case SIOCGIFNETMASK: 332 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 333 break; 334 335 case SIOCSIFDSTADDR: 336 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 337 return (EINVAL); 338 oldaddr = ia->ia_dstaddr; 339 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 340 if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 341 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 342 ia->ia_dstaddr = oldaddr; 343 return (error); 344 } 345 if (ia->ia_flags & IFA_ROUTE) { 346 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 347 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 348 ia->ia_ifa.ifa_dstaddr = 349 (struct sockaddr *)&ia->ia_dstaddr; 350 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 351 } 352 break; 353 354 case SIOCSIFBRDADDR: 355 if ((ifp->if_flags & IFF_BROADCAST) == 0) 356 return (EINVAL); 357 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 358 break; 359 360 case SIOCSIFADDR: 361 return (in_ifinit(ifp, ia, 362 (struct sockaddr_in *) &ifr->ifr_addr, 1)); 363 364 case SIOCSIFNETMASK: 365 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 366 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 367 break; 368 369 case SIOCAIFADDR: 370 maskIsNew = 0; 371 hostIsNew = 1; 372 error = 0; 373 if (ia->ia_addr.sin_family == AF_INET) { 374 if (ifra->ifra_addr.sin_len == 0) { 375 ifra->ifra_addr = ia->ia_addr; 376 hostIsNew = 0; 377 } else if (ifra->ifra_addr.sin_addr.s_addr == 378 ia->ia_addr.sin_addr.s_addr) 379 hostIsNew = 0; 380 } 381 if (ifra->ifra_mask.sin_len) { 382 in_ifscrub(ifp, ia); 383 ia->ia_sockmask = ifra->ifra_mask; 384 ia->ia_sockmask.sin_family = AF_INET; 385 ia->ia_subnetmask = 386 ntohl(ia->ia_sockmask.sin_addr.s_addr); 387 maskIsNew = 1; 388 } 389 if ((ifp->if_flags & IFF_POINTOPOINT) && 390 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 391 in_ifscrub(ifp, ia); 392 ia->ia_dstaddr = ifra->ifra_dstaddr; 393 maskIsNew = 1; /* We lie; but the effect's the same */ 394 } 395 if (ifra->ifra_addr.sin_family == AF_INET && 396 (hostIsNew || maskIsNew)) 397 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 398 if ((ifp->if_flags & IFF_BROADCAST) && 399 (ifra->ifra_broadaddr.sin_family == AF_INET)) 400 ia->ia_broadaddr = ifra->ifra_broadaddr; 401 return (error); 402 403 case SIOCDIFADDR: 404 /* 405 * in_ifscrub kills the interface route. 406 */ 407 in_ifscrub(ifp, ia); 408 /* 409 * in_ifadown gets rid of all the rest of 410 * the routes. This is not quite the right 411 * thing to do, but at least if we are running 412 * a routing process they will come back. 413 */ 414 in_ifadown(&ia->ia_ifa, 1); 415 /* 416 * XXX horrible hack to detect that we are being called 417 * from if_detach() 418 */ 419 if (ifaddr_byindex(ifp->if_index) != NULL) { 420 in_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); 421 in_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); 422 } 423 424 /* 425 * Protect from ipintr() traversing address list 426 * while we're modifying it. 427 */ 428 s = splnet(); 429 430 ifa = &ia->ia_ifa; 431 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 432 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 433 LIST_REMOVE(ia, ia_hash); 434 IFAFREE(&ia->ia_ifa); 435 splx(s); 436 break; 437 438 default: 439 if (ifp == 0 || ifp->if_ioctl == 0) 440 return (EOPNOTSUPP); 441 return ((*ifp->if_ioctl)(ifp, cmd, data)); 442 } 443 return (0); 444 } 445 446 /* 447 * SIOC[GAD]LIFADDR. 448 * SIOCGLIFADDR: get first address. (?!?) 449 * SIOCGLIFADDR with IFLR_PREFIX: 450 * get first address that matches the specified prefix. 451 * SIOCALIFADDR: add the specified address. 452 * SIOCALIFADDR with IFLR_PREFIX: 453 * EINVAL since we can't deduce hostid part of the address. 454 * SIOCDLIFADDR: delete the specified address. 455 * SIOCDLIFADDR with IFLR_PREFIX: 456 * delete the first address that matches the specified prefix. 457 * return values: 458 * EINVAL on invalid parameters 459 * EADDRNOTAVAIL on prefix match failed/specified address not found 460 * other values may be returned from in_ioctl() 461 */ 462 static int 463 in_lifaddr_ioctl(so, cmd, data, ifp, td) 464 struct socket *so; 465 u_long cmd; 466 caddr_t data; 467 struct ifnet *ifp; 468 struct thread *td; 469 { 470 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 471 struct ifaddr *ifa; 472 473 /* sanity checks */ 474 if (!data || !ifp) { 475 panic("invalid argument to in_lifaddr_ioctl"); 476 /*NOTRECHED*/ 477 } 478 479 switch (cmd) { 480 case SIOCGLIFADDR: 481 /* address must be specified on GET with IFLR_PREFIX */ 482 if ((iflr->flags & IFLR_PREFIX) == 0) 483 break; 484 /*FALLTHROUGH*/ 485 case SIOCALIFADDR: 486 case SIOCDLIFADDR: 487 /* address must be specified on ADD and DELETE */ 488 if (iflr->addr.ss_family != AF_INET) 489 return EINVAL; 490 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 491 return EINVAL; 492 /* XXX need improvement */ 493 if (iflr->dstaddr.ss_family 494 && iflr->dstaddr.ss_family != AF_INET) 495 return EINVAL; 496 if (iflr->dstaddr.ss_family 497 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 498 return EINVAL; 499 break; 500 default: /*shouldn't happen*/ 501 return EOPNOTSUPP; 502 } 503 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 504 return EINVAL; 505 506 switch (cmd) { 507 case SIOCALIFADDR: 508 { 509 struct in_aliasreq ifra; 510 511 if (iflr->flags & IFLR_PREFIX) 512 return EINVAL; 513 514 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 515 bzero(&ifra, sizeof(ifra)); 516 bcopy(iflr->iflr_name, ifra.ifra_name, 517 sizeof(ifra.ifra_name)); 518 519 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 520 521 if (iflr->dstaddr.ss_family) { /*XXX*/ 522 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 523 iflr->dstaddr.ss_len); 524 } 525 526 ifra.ifra_mask.sin_family = AF_INET; 527 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 528 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 529 530 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 531 } 532 case SIOCGLIFADDR: 533 case SIOCDLIFADDR: 534 { 535 struct in_ifaddr *ia; 536 struct in_addr mask, candidate, match; 537 struct sockaddr_in *sin; 538 int cmp; 539 540 bzero(&mask, sizeof(mask)); 541 if (iflr->flags & IFLR_PREFIX) { 542 /* lookup a prefix rather than address. */ 543 in_len2mask(&mask, iflr->prefixlen); 544 545 sin = (struct sockaddr_in *)&iflr->addr; 546 match.s_addr = sin->sin_addr.s_addr; 547 match.s_addr &= mask.s_addr; 548 549 /* if you set extra bits, that's wrong */ 550 if (match.s_addr != sin->sin_addr.s_addr) 551 return EINVAL; 552 553 cmp = 1; 554 } else { 555 if (cmd == SIOCGLIFADDR) { 556 /* on getting an address, take the 1st match */ 557 cmp = 0; /*XXX*/ 558 } else { 559 /* on deleting an address, do exact match */ 560 in_len2mask(&mask, 32); 561 sin = (struct sockaddr_in *)&iflr->addr; 562 match.s_addr = sin->sin_addr.s_addr; 563 564 cmp = 1; 565 } 566 } 567 568 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 569 if (ifa->ifa_addr->sa_family != AF_INET6) 570 continue; 571 if (!cmp) 572 break; 573 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 574 candidate.s_addr &= mask.s_addr; 575 if (candidate.s_addr == match.s_addr) 576 break; 577 } 578 if (!ifa) 579 return EADDRNOTAVAIL; 580 ia = (struct in_ifaddr *)ifa; 581 582 if (cmd == SIOCGLIFADDR) { 583 /* fill in the if_laddrreq structure */ 584 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 585 586 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 587 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 588 ia->ia_dstaddr.sin_len); 589 } else 590 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 591 592 iflr->prefixlen = 593 in_mask2len(&ia->ia_sockmask.sin_addr); 594 595 iflr->flags = 0; /*XXX*/ 596 597 return 0; 598 } else { 599 struct in_aliasreq ifra; 600 601 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 602 bzero(&ifra, sizeof(ifra)); 603 bcopy(iflr->iflr_name, ifra.ifra_name, 604 sizeof(ifra.ifra_name)); 605 606 bcopy(&ia->ia_addr, &ifra.ifra_addr, 607 ia->ia_addr.sin_len); 608 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 609 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 610 ia->ia_dstaddr.sin_len); 611 } 612 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 613 ia->ia_sockmask.sin_len); 614 615 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 616 ifp, td); 617 } 618 } 619 } 620 621 return EOPNOTSUPP; /*just for safety*/ 622 } 623 624 /* 625 * Delete any existing route for an interface. 626 */ 627 void 628 in_ifscrub(ifp, ia) 629 register struct ifnet *ifp; 630 register struct in_ifaddr *ia; 631 { 632 633 if ((ia->ia_flags & IFA_ROUTE) == 0) 634 return; 635 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 636 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 637 else 638 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 639 ia->ia_flags &= ~IFA_ROUTE; 640 } 641 642 /* 643 * Initialize an interface's internet address 644 * and routing table entry. 645 */ 646 static int 647 in_ifinit(ifp, ia, sin, scrub) 648 register struct ifnet *ifp; 649 register struct in_ifaddr *ia; 650 struct sockaddr_in *sin; 651 int scrub; 652 { 653 register u_long i = ntohl(sin->sin_addr.s_addr); 654 struct sockaddr_in oldaddr; 655 int s = splimp(), flags = RTF_UP, error; 656 657 oldaddr = ia->ia_addr; 658 ia->ia_addr = *sin; 659 /* 660 * Give the interface a chance to initialize 661 * if this is its first address, 662 * and to validate the address if necessary. 663 */ 664 if (ifp->if_ioctl && 665 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 666 splx(s); 667 ia->ia_addr = oldaddr; 668 return (error); 669 } 670 if (oldaddr.sin_family == AF_INET) 671 LIST_REMOVE(ia, ia_hash); 672 if (ia->ia_addr.sin_family == AF_INET) 673 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 674 ia, ia_hash); 675 splx(s); 676 if (scrub) { 677 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 678 in_ifscrub(ifp, ia); 679 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 680 } 681 if (IN_CLASSA(i)) 682 ia->ia_netmask = IN_CLASSA_NET; 683 else if (IN_CLASSB(i)) 684 ia->ia_netmask = IN_CLASSB_NET; 685 else 686 ia->ia_netmask = IN_CLASSC_NET; 687 /* 688 * The subnet mask usually includes at least the standard network part, 689 * but may may be smaller in the case of supernetting. 690 * If it is set, we believe it. 691 */ 692 if (ia->ia_subnetmask == 0) { 693 ia->ia_subnetmask = ia->ia_netmask; 694 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 695 } else 696 ia->ia_netmask &= ia->ia_subnetmask; 697 ia->ia_net = i & ia->ia_netmask; 698 ia->ia_subnet = i & ia->ia_subnetmask; 699 in_socktrim(&ia->ia_sockmask); 700 /* 701 * Add route for the network. 702 */ 703 ia->ia_ifa.ifa_metric = ifp->if_metric; 704 if (ifp->if_flags & IFF_BROADCAST) { 705 ia->ia_broadaddr.sin_addr.s_addr = 706 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 707 ia->ia_netbroadcast.s_addr = 708 htonl(ia->ia_net | ~ ia->ia_netmask); 709 } else if (ifp->if_flags & IFF_LOOPBACK) { 710 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 711 flags |= RTF_HOST; 712 } else if (ifp->if_flags & IFF_POINTOPOINT) { 713 if (ia->ia_dstaddr.sin_family != AF_INET) 714 return (0); 715 flags |= RTF_HOST; 716 } 717 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0) 718 ia->ia_flags |= IFA_ROUTE; 719 /* XXX check if the subnet route points to the same interface */ 720 if (error == EEXIST) 721 error = 0; 722 723 /* 724 * If the interface supports multicast, join the "all hosts" 725 * multicast group on that interface. 726 */ 727 if (ifp->if_flags & IFF_MULTICAST) { 728 struct in_addr addr; 729 730 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 731 in_addmulti(&addr, ifp); 732 } 733 return (error); 734 } 735 736 737 /* 738 * Return 1 if the address might be a local broadcast address. 739 */ 740 int 741 in_broadcast(in, ifp) 742 struct in_addr in; 743 struct ifnet *ifp; 744 { 745 register struct ifaddr *ifa; 746 u_long t; 747 748 if (in.s_addr == INADDR_BROADCAST || 749 in.s_addr == INADDR_ANY) 750 return 1; 751 if ((ifp->if_flags & IFF_BROADCAST) == 0) 752 return 0; 753 t = ntohl(in.s_addr); 754 /* 755 * Look through the list of addresses for a match 756 * with a broadcast address. 757 */ 758 #define ia ((struct in_ifaddr *)ifa) 759 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 760 if (ifa->ifa_addr->sa_family == AF_INET && 761 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 762 in.s_addr == ia->ia_netbroadcast.s_addr || 763 /* 764 * Check for old-style (host 0) broadcast. 765 */ 766 t == ia->ia_subnet || t == ia->ia_net) && 767 /* 768 * Check for an all one subnetmask. These 769 * only exist when an interface gets a secondary 770 * address. 771 */ 772 ia->ia_subnetmask != (u_long)0xffffffff) 773 return 1; 774 return (0); 775 #undef ia 776 } 777 /* 778 * Add an address to the list of IP multicast addresses for a given interface. 779 */ 780 struct in_multi * 781 in_addmulti(ap, ifp) 782 register struct in_addr *ap; 783 register struct ifnet *ifp; 784 { 785 register struct in_multi *inm; 786 int error; 787 struct sockaddr_in sin; 788 struct ifmultiaddr *ifma; 789 int s = splnet(); 790 791 /* 792 * Call generic routine to add membership or increment 793 * refcount. It wants addresses in the form of a sockaddr, 794 * so we build one here (being careful to zero the unused bytes). 795 */ 796 bzero(&sin, sizeof sin); 797 sin.sin_family = AF_INET; 798 sin.sin_len = sizeof sin; 799 sin.sin_addr = *ap; 800 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 801 if (error) { 802 splx(s); 803 return 0; 804 } 805 806 /* 807 * If ifma->ifma_protospec is null, then if_addmulti() created 808 * a new record. Otherwise, we are done. 809 */ 810 if (ifma->ifma_protospec != 0) { 811 splx(s); 812 return ifma->ifma_protospec; 813 } 814 815 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 816 at interrupt time? If so, need to fix if_addmulti. XXX */ 817 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, 818 M_NOWAIT | M_ZERO); 819 if (inm == NULL) { 820 splx(s); 821 return (NULL); 822 } 823 824 inm->inm_addr = *ap; 825 inm->inm_ifp = ifp; 826 inm->inm_ifma = ifma; 827 ifma->ifma_protospec = inm; 828 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 829 830 /* 831 * Let IGMP know that we have joined a new IP multicast group. 832 */ 833 igmp_joingroup(inm); 834 splx(s); 835 return (inm); 836 } 837 838 /* 839 * Delete a multicast address record. 840 */ 841 void 842 in_delmulti(inm) 843 register struct in_multi *inm; 844 { 845 struct ifmultiaddr *ifma = inm->inm_ifma; 846 struct in_multi my_inm; 847 int s = splnet(); 848 849 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 850 if (ifma->ifma_refcount == 1) { 851 /* 852 * No remaining claims to this record; let IGMP know that 853 * we are leaving the multicast group. 854 * But do it after the if_delmulti() which might reset 855 * the interface and nuke the packet. 856 */ 857 my_inm = *inm ; 858 ifma->ifma_protospec = 0; 859 LIST_REMOVE(inm, inm_link); 860 free(inm, M_IPMADDR); 861 } 862 /* XXX - should be separate API for when we have an ifma? */ 863 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 864 if (my_inm.inm_ifp != NULL) 865 igmp_leavegroup(&my_inm); 866 splx(s); 867 } 868