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