1 /*- 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (C) 2001 WIDE Project. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)in.c 8.4 (Berkeley) 1/9/95 31 * $FreeBSD$ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/sockio.h> 37 #include <sys/malloc.h> 38 #include <sys/socket.h> 39 #include <sys/kernel.h> 40 #include <sys/sysctl.h> 41 42 #include <net/if.h> 43 #include <net/if_types.h> 44 #include <net/route.h> 45 46 #include <netinet/in.h> 47 #include <netinet/in_var.h> 48 #include <netinet/in_pcb.h> 49 50 #include <netinet/igmp_var.h> 51 52 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 53 54 static int in_mask2len(struct in_addr *); 55 static void in_len2mask(struct in_addr *, int); 56 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 57 struct ifnet *, struct thread *); 58 59 static int in_addprefix(struct in_ifaddr *, int); 60 static int in_scrubprefix(struct in_ifaddr *); 61 static void in_socktrim(struct sockaddr_in *); 62 static int in_ifinit(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, "Treat all subnets as directly connected"); 68 69 struct in_multihead in_multihead; /* XXX BSS initialization */ 70 71 extern struct inpcbinfo ripcbinfo; 72 extern struct inpcbinfo udbinfo; 73 74 /* 75 * Return 1 if an internet address is for a ``local'' host 76 * (one to which we have a connection). If subnetsarelocal 77 * is true, this includes other subnets of the local net. 78 * Otherwise, it includes only the directly-connected (sub)nets. 79 */ 80 int 81 in_localaddr(in) 82 struct in_addr in; 83 { 84 register u_long i = ntohl(in.s_addr); 85 register struct in_ifaddr *ia; 86 87 if (subnetsarelocal) { 88 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 89 if ((i & ia->ia_netmask) == ia->ia_net) 90 return (1); 91 } else { 92 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 93 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 94 return (1); 95 } 96 return (0); 97 } 98 99 /* 100 * Return 1 if an internet address is for the local host and configured 101 * on one of its interfaces. 102 */ 103 int 104 in_localip(in) 105 struct in_addr in; 106 { 107 struct in_ifaddr *ia; 108 109 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 110 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 111 return 1; 112 } 113 return 0; 114 } 115 116 /* 117 * Determine whether an IP address is in a reserved set of addresses 118 * that may not be forwarded, or whether datagrams to that destination 119 * may be forwarded. 120 */ 121 int 122 in_canforward(in) 123 struct in_addr in; 124 { 125 register u_long i = ntohl(in.s_addr); 126 register u_long net; 127 128 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 129 return (0); 130 if (IN_CLASSA(i)) { 131 net = i & IN_CLASSA_NET; 132 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 133 return (0); 134 } 135 return (1); 136 } 137 138 /* 139 * Trim a mask in a sockaddr 140 */ 141 static void 142 in_socktrim(ap) 143 struct sockaddr_in *ap; 144 { 145 register char *cplim = (char *) &ap->sin_addr; 146 register char *cp = (char *) (&ap->sin_addr + 1); 147 148 ap->sin_len = 0; 149 while (--cp >= cplim) 150 if (*cp) { 151 (ap)->sin_len = cp - (char *) (ap) + 1; 152 break; 153 } 154 } 155 156 static int 157 in_mask2len(mask) 158 struct in_addr *mask; 159 { 160 int x, y; 161 u_char *p; 162 163 p = (u_char *)mask; 164 for (x = 0; x < sizeof(*mask); x++) { 165 if (p[x] != 0xff) 166 break; 167 } 168 y = 0; 169 if (x < sizeof(*mask)) { 170 for (y = 0; y < 8; y++) { 171 if ((p[x] & (0x80 >> y)) == 0) 172 break; 173 } 174 } 175 return x * 8 + y; 176 } 177 178 static void 179 in_len2mask(mask, len) 180 struct in_addr *mask; 181 int len; 182 { 183 int i; 184 u_char *p; 185 186 p = (u_char *)mask; 187 bzero(mask, sizeof(*mask)); 188 for (i = 0; i < len / 8; i++) 189 p[i] = 0xff; 190 if (len % 8) 191 p[i] = (0xff00 >> (len % 8)) & 0xff; 192 } 193 194 /* 195 * Generic internet control operations (ioctl's). 196 * Ifp is 0 if not an interface-specific ioctl. 197 */ 198 /* ARGSUSED */ 199 int 200 in_control(so, cmd, data, ifp, td) 201 struct socket *so; 202 u_long cmd; 203 caddr_t data; 204 register struct ifnet *ifp; 205 struct thread *td; 206 { 207 register struct ifreq *ifr = (struct ifreq *)data; 208 register struct in_ifaddr *ia = 0, *iap; 209 register struct ifaddr *ifa; 210 struct in_addr dst; 211 struct in_ifaddr *oia; 212 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 213 struct sockaddr_in oldaddr; 214 int error, hostIsNew, iaIsNew, maskIsNew, s; 215 216 iaIsNew = 0; 217 218 switch (cmd) { 219 case SIOCALIFADDR: 220 case SIOCDLIFADDR: 221 if (td && (error = suser(td)) != 0) 222 return error; 223 /*fall through*/ 224 case SIOCGLIFADDR: 225 if (!ifp) 226 return EINVAL; 227 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 228 } 229 230 /* 231 * Find address for this interface, if it exists. 232 * 233 * If an alias address was specified, find that one instead of 234 * the first one on the interface, if possible. 235 */ 236 if (ifp) { 237 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 238 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 239 if (iap->ia_ifp == ifp && 240 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 241 ia = iap; 242 break; 243 } 244 if (ia == NULL) 245 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 246 iap = ifatoia(ifa); 247 if (iap->ia_addr.sin_family == AF_INET) { 248 ia = iap; 249 break; 250 } 251 } 252 } 253 254 switch (cmd) { 255 256 case SIOCAIFADDR: 257 case SIOCDIFADDR: 258 if (ifp == 0) 259 return (EADDRNOTAVAIL); 260 if (ifra->ifra_addr.sin_family == AF_INET) { 261 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 262 if (ia->ia_ifp == ifp && 263 ia->ia_addr.sin_addr.s_addr == 264 ifra->ifra_addr.sin_addr.s_addr) 265 break; 266 } 267 if ((ifp->if_flags & IFF_POINTOPOINT) 268 && (cmd == SIOCAIFADDR) 269 && (ifra->ifra_dstaddr.sin_addr.s_addr 270 == INADDR_ANY)) { 271 return EDESTADDRREQ; 272 } 273 } 274 if (cmd == SIOCDIFADDR && ia == 0) 275 return (EADDRNOTAVAIL); 276 /* FALLTHROUGH */ 277 case SIOCSIFADDR: 278 case SIOCSIFNETMASK: 279 case SIOCSIFDSTADDR: 280 if (td && (error = suser(td)) != 0) 281 return error; 282 283 if (ifp == 0) 284 return (EADDRNOTAVAIL); 285 if (ia == (struct in_ifaddr *)0) { 286 ia = (struct in_ifaddr *) 287 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 288 if (ia == (struct in_ifaddr *)NULL) 289 return (ENOBUFS); 290 /* 291 * Protect from ipintr() traversing address list 292 * while we're modifying it. 293 */ 294 s = splnet(); 295 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 296 297 ifa = &ia->ia_ifa; 298 IFA_LOCK_INIT(ifa); 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 ifa->ifa_refcnt = 1; 303 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 304 305 ia->ia_sockmask.sin_len = 8; 306 ia->ia_sockmask.sin_family = AF_INET; 307 if (ifp->if_flags & IFF_BROADCAST) { 308 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 309 ia->ia_broadaddr.sin_family = AF_INET; 310 } 311 ia->ia_ifp = ifp; 312 splx(s); 313 iaIsNew = 1; 314 } 315 break; 316 317 case SIOCSIFBRDADDR: 318 if (td && (error = suser(td)) != 0) 319 return error; 320 /* FALLTHROUGH */ 321 322 case SIOCGIFADDR: 323 case SIOCGIFNETMASK: 324 case SIOCGIFDSTADDR: 325 case SIOCGIFBRDADDR: 326 if (ia == (struct in_ifaddr *)0) 327 return (EADDRNOTAVAIL); 328 break; 329 } 330 switch (cmd) { 331 332 case SIOCGIFADDR: 333 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 334 return (0); 335 336 case SIOCGIFBRDADDR: 337 if ((ifp->if_flags & IFF_BROADCAST) == 0) 338 return (EINVAL); 339 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 340 return (0); 341 342 case SIOCGIFDSTADDR: 343 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 344 return (EINVAL); 345 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 346 return (0); 347 348 case SIOCGIFNETMASK: 349 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 350 return (0); 351 352 case SIOCSIFDSTADDR: 353 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 354 return (EINVAL); 355 oldaddr = ia->ia_dstaddr; 356 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 357 if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 358 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 359 ia->ia_dstaddr = oldaddr; 360 return (error); 361 } 362 if (ia->ia_flags & IFA_ROUTE) { 363 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 364 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 365 ia->ia_ifa.ifa_dstaddr = 366 (struct sockaddr *)&ia->ia_dstaddr; 367 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 368 } 369 return (0); 370 371 case SIOCSIFBRDADDR: 372 if ((ifp->if_flags & IFF_BROADCAST) == 0) 373 return (EINVAL); 374 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 375 return (0); 376 377 case SIOCSIFADDR: 378 error = in_ifinit(ifp, ia, 379 (struct sockaddr_in *) &ifr->ifr_addr, 1); 380 if (error != 0 && iaIsNew) 381 break; 382 if (error == 0) 383 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 384 return (0); 385 386 case SIOCSIFNETMASK: 387 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 388 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 389 return (0); 390 391 case SIOCAIFADDR: 392 maskIsNew = 0; 393 hostIsNew = 1; 394 error = 0; 395 if (ia->ia_addr.sin_family == AF_INET) { 396 if (ifra->ifra_addr.sin_len == 0) { 397 ifra->ifra_addr = ia->ia_addr; 398 hostIsNew = 0; 399 } else if (ifra->ifra_addr.sin_addr.s_addr == 400 ia->ia_addr.sin_addr.s_addr) 401 hostIsNew = 0; 402 } 403 if (ifra->ifra_mask.sin_len) { 404 in_ifscrub(ifp, ia); 405 ia->ia_sockmask = ifra->ifra_mask; 406 ia->ia_sockmask.sin_family = AF_INET; 407 ia->ia_subnetmask = 408 ntohl(ia->ia_sockmask.sin_addr.s_addr); 409 maskIsNew = 1; 410 } 411 if ((ifp->if_flags & IFF_POINTOPOINT) && 412 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 413 in_ifscrub(ifp, ia); 414 ia->ia_dstaddr = ifra->ifra_dstaddr; 415 maskIsNew = 1; /* We lie; but the effect's the same */ 416 } 417 if (ifra->ifra_addr.sin_family == AF_INET && 418 (hostIsNew || maskIsNew)) 419 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 420 if (error != 0 && iaIsNew) 421 break; 422 423 if ((ifp->if_flags & IFF_BROADCAST) && 424 (ifra->ifra_broadaddr.sin_family == AF_INET)) 425 ia->ia_broadaddr = ifra->ifra_broadaddr; 426 if (error == 0) 427 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 428 return (error); 429 430 case SIOCDIFADDR: 431 /* 432 * in_ifscrub kills the interface route. 433 */ 434 in_ifscrub(ifp, ia); 435 /* 436 * in_ifadown gets rid of all the rest of 437 * the routes. This is not quite the right 438 * thing to do, but at least if we are running 439 * a routing process they will come back. 440 */ 441 in_ifadown(&ia->ia_ifa, 1); 442 /* 443 * XXX horrible hack to detect that we are being called 444 * from if_detach() 445 */ 446 if (ifaddr_byindex(ifp->if_index) == NULL) { 447 in_pcbpurgeif0(&ripcbinfo, ifp); 448 in_pcbpurgeif0(&udbinfo, ifp); 449 } 450 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 451 error = 0; 452 break; 453 454 default: 455 if (ifp == 0 || ifp->if_ioctl == 0) 456 return (EOPNOTSUPP); 457 return ((*ifp->if_ioctl)(ifp, cmd, data)); 458 } 459 460 /* 461 * Protect from ipintr() traversing address list while we're modifying 462 * it. 463 */ 464 s = splnet(); 465 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 466 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 467 LIST_REMOVE(ia, ia_hash); 468 IFAFREE(&ia->ia_ifa); 469 splx(s); 470 471 return (error); 472 } 473 474 /* 475 * SIOC[GAD]LIFADDR. 476 * SIOCGLIFADDR: get first address. (?!?) 477 * SIOCGLIFADDR with IFLR_PREFIX: 478 * get first address that matches the specified prefix. 479 * SIOCALIFADDR: add the specified address. 480 * SIOCALIFADDR with IFLR_PREFIX: 481 * EINVAL since we can't deduce hostid part of the address. 482 * SIOCDLIFADDR: delete the specified address. 483 * SIOCDLIFADDR with IFLR_PREFIX: 484 * delete the first address that matches the specified prefix. 485 * return values: 486 * EINVAL on invalid parameters 487 * EADDRNOTAVAIL on prefix match failed/specified address not found 488 * other values may be returned from in_ioctl() 489 */ 490 static int 491 in_lifaddr_ioctl(so, cmd, data, ifp, td) 492 struct socket *so; 493 u_long cmd; 494 caddr_t data; 495 struct ifnet *ifp; 496 struct thread *td; 497 { 498 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 499 struct ifaddr *ifa; 500 501 /* sanity checks */ 502 if (!data || !ifp) { 503 panic("invalid argument to in_lifaddr_ioctl"); 504 /*NOTRECHED*/ 505 } 506 507 switch (cmd) { 508 case SIOCGLIFADDR: 509 /* address must be specified on GET with IFLR_PREFIX */ 510 if ((iflr->flags & IFLR_PREFIX) == 0) 511 break; 512 /*FALLTHROUGH*/ 513 case SIOCALIFADDR: 514 case SIOCDLIFADDR: 515 /* address must be specified on ADD and DELETE */ 516 if (iflr->addr.ss_family != AF_INET) 517 return EINVAL; 518 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 519 return EINVAL; 520 /* XXX need improvement */ 521 if (iflr->dstaddr.ss_family 522 && iflr->dstaddr.ss_family != AF_INET) 523 return EINVAL; 524 if (iflr->dstaddr.ss_family 525 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 526 return EINVAL; 527 break; 528 default: /*shouldn't happen*/ 529 return EOPNOTSUPP; 530 } 531 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 532 return EINVAL; 533 534 switch (cmd) { 535 case SIOCALIFADDR: 536 { 537 struct in_aliasreq ifra; 538 539 if (iflr->flags & IFLR_PREFIX) 540 return EINVAL; 541 542 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 543 bzero(&ifra, sizeof(ifra)); 544 bcopy(iflr->iflr_name, ifra.ifra_name, 545 sizeof(ifra.ifra_name)); 546 547 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 548 549 if (iflr->dstaddr.ss_family) { /*XXX*/ 550 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 551 iflr->dstaddr.ss_len); 552 } 553 554 ifra.ifra_mask.sin_family = AF_INET; 555 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 556 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 557 558 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 559 } 560 case SIOCGLIFADDR: 561 case SIOCDLIFADDR: 562 { 563 struct in_ifaddr *ia; 564 struct in_addr mask, candidate, match; 565 struct sockaddr_in *sin; 566 int cmp; 567 568 bzero(&mask, sizeof(mask)); 569 if (iflr->flags & IFLR_PREFIX) { 570 /* lookup a prefix rather than address. */ 571 in_len2mask(&mask, iflr->prefixlen); 572 573 sin = (struct sockaddr_in *)&iflr->addr; 574 match.s_addr = sin->sin_addr.s_addr; 575 match.s_addr &= mask.s_addr; 576 577 /* if you set extra bits, that's wrong */ 578 if (match.s_addr != sin->sin_addr.s_addr) 579 return EINVAL; 580 581 cmp = 1; 582 } else { 583 if (cmd == SIOCGLIFADDR) { 584 /* on getting an address, take the 1st match */ 585 cmp = 0; /*XXX*/ 586 } else { 587 /* on deleting an address, do exact match */ 588 in_len2mask(&mask, 32); 589 sin = (struct sockaddr_in *)&iflr->addr; 590 match.s_addr = sin->sin_addr.s_addr; 591 592 cmp = 1; 593 } 594 } 595 596 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 597 if (ifa->ifa_addr->sa_family != AF_INET6) 598 continue; 599 if (!cmp) 600 break; 601 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 602 candidate.s_addr &= mask.s_addr; 603 if (candidate.s_addr == match.s_addr) 604 break; 605 } 606 if (!ifa) 607 return EADDRNOTAVAIL; 608 ia = (struct in_ifaddr *)ifa; 609 610 if (cmd == SIOCGLIFADDR) { 611 /* fill in the if_laddrreq structure */ 612 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 613 614 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 615 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 616 ia->ia_dstaddr.sin_len); 617 } else 618 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 619 620 iflr->prefixlen = 621 in_mask2len(&ia->ia_sockmask.sin_addr); 622 623 iflr->flags = 0; /*XXX*/ 624 625 return 0; 626 } else { 627 struct in_aliasreq ifra; 628 629 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 630 bzero(&ifra, sizeof(ifra)); 631 bcopy(iflr->iflr_name, ifra.ifra_name, 632 sizeof(ifra.ifra_name)); 633 634 bcopy(&ia->ia_addr, &ifra.ifra_addr, 635 ia->ia_addr.sin_len); 636 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 637 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 638 ia->ia_dstaddr.sin_len); 639 } 640 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 641 ia->ia_sockmask.sin_len); 642 643 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 644 ifp, td); 645 } 646 } 647 } 648 649 return EOPNOTSUPP; /*just for safety*/ 650 } 651 652 /* 653 * Delete any existing route for an interface. 654 */ 655 void 656 in_ifscrub(ifp, ia) 657 register struct ifnet *ifp; 658 register struct in_ifaddr *ia; 659 { 660 in_scrubprefix(ia); 661 } 662 663 /* 664 * Initialize an interface's internet address 665 * and routing table entry. 666 */ 667 static int 668 in_ifinit(ifp, ia, sin, scrub) 669 register struct ifnet *ifp; 670 register struct in_ifaddr *ia; 671 struct sockaddr_in *sin; 672 int scrub; 673 { 674 register u_long i = ntohl(sin->sin_addr.s_addr); 675 struct sockaddr_in oldaddr; 676 int s = splimp(), flags = RTF_UP, error = 0; 677 678 oldaddr = ia->ia_addr; 679 if (oldaddr.sin_family == AF_INET) 680 LIST_REMOVE(ia, ia_hash); 681 ia->ia_addr = *sin; 682 if (ia->ia_addr.sin_family == AF_INET) 683 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 684 ia, ia_hash); 685 /* 686 * Give the interface a chance to initialize 687 * if this is its first address, 688 * and to validate the address if necessary. 689 */ 690 if (ifp->if_ioctl && 691 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 692 splx(s); 693 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 694 ia->ia_addr = oldaddr; 695 if (ia->ia_addr.sin_family == AF_INET) 696 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 697 ia, ia_hash); 698 return (error); 699 } 700 splx(s); 701 if (scrub) { 702 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 703 in_ifscrub(ifp, ia); 704 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 705 } 706 if (IN_CLASSA(i)) 707 ia->ia_netmask = IN_CLASSA_NET; 708 else if (IN_CLASSB(i)) 709 ia->ia_netmask = IN_CLASSB_NET; 710 else 711 ia->ia_netmask = IN_CLASSC_NET; 712 /* 713 * The subnet mask usually includes at least the standard network part, 714 * but may may be smaller in the case of supernetting. 715 * If it is set, we believe it. 716 */ 717 if (ia->ia_subnetmask == 0) { 718 ia->ia_subnetmask = ia->ia_netmask; 719 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 720 } else 721 ia->ia_netmask &= ia->ia_subnetmask; 722 ia->ia_net = i & ia->ia_netmask; 723 ia->ia_subnet = i & ia->ia_subnetmask; 724 in_socktrim(&ia->ia_sockmask); 725 /* 726 * Add route for the network. 727 */ 728 ia->ia_ifa.ifa_metric = ifp->if_metric; 729 if (ifp->if_flags & IFF_BROADCAST) { 730 ia->ia_broadaddr.sin_addr.s_addr = 731 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 732 ia->ia_netbroadcast.s_addr = 733 htonl(ia->ia_net | ~ ia->ia_netmask); 734 } else if (ifp->if_flags & IFF_LOOPBACK) { 735 ia->ia_dstaddr = ia->ia_addr; 736 flags |= RTF_HOST; 737 } else if (ifp->if_flags & IFF_POINTOPOINT) { 738 if (ia->ia_dstaddr.sin_family != AF_INET) 739 return (0); 740 flags |= RTF_HOST; 741 } 742 /* 743 * XXX: A route to network should never point to a carp(4) 744 * interface. Use only host route for CARP address. 745 */ 746 if (ifp->if_type == IFT_CARP) 747 flags |= RTF_HOST; 748 if ((error = in_addprefix(ia, flags)) != 0) 749 return (error); 750 751 /* 752 * If the interface supports multicast, join the "all hosts" 753 * multicast group on that interface. 754 */ 755 if (ifp->if_flags & IFF_MULTICAST) { 756 struct in_addr addr; 757 758 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 759 in_addmulti(&addr, ifp); 760 } 761 return (error); 762 } 763 764 #define rtinitflags(x) \ 765 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 766 ? RTF_HOST : 0) 767 /* 768 * Check if we have a route for the given prefix already or add a one 769 * accordingly. 770 */ 771 static int 772 in_addprefix(target, flags) 773 struct in_ifaddr *target; 774 int flags; 775 { 776 struct in_ifaddr *ia; 777 struct in_addr prefix, mask, p; 778 int error; 779 780 if ((flags & RTF_HOST) != 0) 781 prefix = target->ia_dstaddr.sin_addr; 782 else { 783 prefix = target->ia_addr.sin_addr; 784 mask = target->ia_sockmask.sin_addr; 785 prefix.s_addr &= mask.s_addr; 786 } 787 788 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 789 if (rtinitflags(ia)) 790 p = ia->ia_dstaddr.sin_addr; 791 else { 792 p = ia->ia_addr.sin_addr; 793 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 794 } 795 796 if (prefix.s_addr != p.s_addr) 797 continue; 798 799 /* 800 * If we got a matching prefix route inserted by other 801 * interface address, we are done here. 802 */ 803 if (ia->ia_flags & IFA_ROUTE) 804 return 0; 805 } 806 807 /* 808 * No-one seem to have this prefix route, so we try to insert it. 809 */ 810 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 811 if (!error) 812 target->ia_flags |= IFA_ROUTE; 813 return error; 814 } 815 816 /* 817 * If there is no other address in the system that can serve a route to the 818 * same prefix, remove the route. Hand over the route to the new address 819 * otherwise. 820 */ 821 static int 822 in_scrubprefix(target) 823 struct in_ifaddr *target; 824 { 825 struct in_ifaddr *ia; 826 struct in_addr prefix, mask, p; 827 int error; 828 829 if ((target->ia_flags & IFA_ROUTE) == 0) 830 return 0; 831 832 if (rtinitflags(target)) 833 prefix = target->ia_dstaddr.sin_addr; 834 else { 835 prefix = target->ia_addr.sin_addr; 836 mask = target->ia_sockmask.sin_addr; 837 prefix.s_addr &= mask.s_addr; 838 } 839 840 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 841 if (rtinitflags(ia)) 842 p = ia->ia_dstaddr.sin_addr; 843 else { 844 p = ia->ia_addr.sin_addr; 845 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 846 } 847 848 if (prefix.s_addr != p.s_addr) 849 continue; 850 851 /* 852 * If we got a matching prefix address, move IFA_ROUTE and 853 * the route itself to it. Make sure that routing daemons 854 * get a heads-up. 855 */ 856 if ((ia->ia_flags & IFA_ROUTE) == 0) { 857 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 858 rtinitflags(target)); 859 target->ia_flags &= ~IFA_ROUTE; 860 861 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 862 rtinitflags(ia) | RTF_UP); 863 if (error == 0) 864 ia->ia_flags |= IFA_ROUTE; 865 return error; 866 } 867 } 868 869 /* 870 * As no-one seem to have this prefix, we can remove the route. 871 */ 872 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 873 target->ia_flags &= ~IFA_ROUTE; 874 return 0; 875 } 876 877 #undef rtinitflags 878 879 /* 880 * Return 1 if the address might be a local broadcast address. 881 */ 882 int 883 in_broadcast(in, ifp) 884 struct in_addr in; 885 struct ifnet *ifp; 886 { 887 register struct ifaddr *ifa; 888 u_long t; 889 890 if (in.s_addr == INADDR_BROADCAST || 891 in.s_addr == INADDR_ANY) 892 return 1; 893 if ((ifp->if_flags & IFF_BROADCAST) == 0) 894 return 0; 895 t = ntohl(in.s_addr); 896 /* 897 * Look through the list of addresses for a match 898 * with a broadcast address. 899 */ 900 #define ia ((struct in_ifaddr *)ifa) 901 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 902 if (ifa->ifa_addr->sa_family == AF_INET && 903 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 904 in.s_addr == ia->ia_netbroadcast.s_addr || 905 /* 906 * Check for old-style (host 0) broadcast. 907 */ 908 t == ia->ia_subnet || t == ia->ia_net) && 909 /* 910 * Check for an all one subnetmask. These 911 * only exist when an interface gets a secondary 912 * address. 913 */ 914 ia->ia_subnetmask != (u_long)0xffffffff) 915 return 1; 916 return (0); 917 #undef ia 918 } 919 /* 920 * Add an address to the list of IP multicast addresses for a given interface. 921 */ 922 struct in_multi * 923 in_addmulti(ap, ifp) 924 register struct in_addr *ap; 925 register struct ifnet *ifp; 926 { 927 register struct in_multi *inm; 928 int error; 929 struct sockaddr_in sin; 930 struct ifmultiaddr *ifma; 931 int s = splnet(); 932 933 /* 934 * Call generic routine to add membership or increment 935 * refcount. It wants addresses in the form of a sockaddr, 936 * so we build one here (being careful to zero the unused bytes). 937 */ 938 bzero(&sin, sizeof sin); 939 sin.sin_family = AF_INET; 940 sin.sin_len = sizeof sin; 941 sin.sin_addr = *ap; 942 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 943 if (error) { 944 splx(s); 945 return 0; 946 } 947 948 /* 949 * If ifma->ifma_protospec is null, then if_addmulti() created 950 * a new record. Otherwise, we are done. 951 */ 952 if (ifma->ifma_protospec != 0) { 953 splx(s); 954 return ifma->ifma_protospec; 955 } 956 957 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 958 at interrupt time? If so, need to fix if_addmulti. XXX */ 959 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, 960 M_NOWAIT | M_ZERO); 961 if (inm == NULL) { 962 splx(s); 963 return (NULL); 964 } 965 966 inm->inm_addr = *ap; 967 inm->inm_ifp = ifp; 968 inm->inm_ifma = ifma; 969 ifma->ifma_protospec = inm; 970 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 971 972 /* 973 * Let IGMP know that we have joined a new IP multicast group. 974 */ 975 igmp_joingroup(inm); 976 splx(s); 977 return (inm); 978 } 979 980 /* 981 * Delete a multicast address record. 982 */ 983 void 984 in_delmulti(inm) 985 register struct in_multi *inm; 986 { 987 struct ifmultiaddr *ifma = inm->inm_ifma; 988 struct in_multi my_inm; 989 int s = splnet(); 990 991 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 992 if (ifma->ifma_refcount == 1) { 993 /* 994 * No remaining claims to this record; let IGMP know that 995 * we are leaving the multicast group. 996 * But do it after the if_delmulti() which might reset 997 * the interface and nuke the packet. 998 */ 999 my_inm = *inm ; 1000 ifma->ifma_protospec = 0; 1001 LIST_REMOVE(inm, inm_link); 1002 free(inm, M_IPMADDR); 1003 } 1004 /* XXX - should be separate API for when we have an ifma? */ 1005 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1006 if (my_inm.inm_ifp != NULL) 1007 igmp_leavegroup(&my_inm); 1008 splx(s); 1009 } 1010