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