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 "opt_carp.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/sockio.h> 39 #include <sys/malloc.h> 40 #include <sys/socket.h> 41 #include <sys/kernel.h> 42 #include <sys/sysctl.h> 43 44 #include <net/if.h> 45 #include <net/if_types.h> 46 #include <net/route.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_var.h> 50 #include <netinet/in_pcb.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(struct in_addr *); 57 static void in_len2mask(struct in_addr *, int); 58 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 59 struct ifnet *, struct thread *); 60 61 static int in_addprefix(struct in_ifaddr *, int); 62 static int in_scrubprefix(struct in_ifaddr *); 63 static void in_socktrim(struct sockaddr_in *); 64 static int in_ifinit(struct ifnet *, 65 struct in_ifaddr *, struct sockaddr_in *, int); 66 67 static int subnetsarelocal = 0; 68 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 69 &subnetsarelocal, 0, "Treat all subnets as directly connected"); 70 71 struct in_multihead in_multihead; /* XXX BSS initialization */ 72 73 extern struct inpcbinfo ripcbinfo; 74 extern struct inpcbinfo udbinfo; 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 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 91 if ((i & ia->ia_netmask) == ia->ia_net) 92 return (1); 93 } else { 94 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 95 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 96 return (1); 97 } 98 return (0); 99 } 100 101 /* 102 * Return 1 if an internet address is for the local host and configured 103 * on one of its interfaces. 104 */ 105 int 106 in_localip(in) 107 struct in_addr in; 108 { 109 struct in_ifaddr *ia; 110 111 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 112 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 113 return 1; 114 } 115 return 0; 116 } 117 118 /* 119 * Determine whether an IP address is in a reserved set of addresses 120 * that may not be forwarded, or whether datagrams to that destination 121 * may be forwarded. 122 */ 123 int 124 in_canforward(in) 125 struct in_addr in; 126 { 127 register u_long i = ntohl(in.s_addr); 128 register u_long net; 129 130 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 131 return (0); 132 if (IN_CLASSA(i)) { 133 net = i & IN_CLASSA_NET; 134 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 135 return (0); 136 } 137 return (1); 138 } 139 140 /* 141 * Trim a mask in a sockaddr 142 */ 143 static void 144 in_socktrim(ap) 145 struct sockaddr_in *ap; 146 { 147 register char *cplim = (char *) &ap->sin_addr; 148 register char *cp = (char *) (&ap->sin_addr + 1); 149 150 ap->sin_len = 0; 151 while (--cp >= cplim) 152 if (*cp) { 153 (ap)->sin_len = cp - (char *) (ap) + 1; 154 break; 155 } 156 } 157 158 static int 159 in_mask2len(mask) 160 struct in_addr *mask; 161 { 162 int x, y; 163 u_char *p; 164 165 p = (u_char *)mask; 166 for (x = 0; x < sizeof(*mask); x++) { 167 if (p[x] != 0xff) 168 break; 169 } 170 y = 0; 171 if (x < sizeof(*mask)) { 172 for (y = 0; y < 8; y++) { 173 if ((p[x] & (0x80 >> y)) == 0) 174 break; 175 } 176 } 177 return x * 8 + y; 178 } 179 180 static void 181 in_len2mask(mask, len) 182 struct in_addr *mask; 183 int len; 184 { 185 int i; 186 u_char *p; 187 188 p = (u_char *)mask; 189 bzero(mask, sizeof(*mask)); 190 for (i = 0; i < len / 8; i++) 191 p[i] = 0xff; 192 if (len % 8) 193 p[i] = (0xff00 >> (len % 8)) & 0xff; 194 } 195 196 /* 197 * Generic internet control operations (ioctl's). 198 * Ifp is 0 if not an interface-specific ioctl. 199 */ 200 /* ARGSUSED */ 201 int 202 in_control(so, cmd, data, ifp, td) 203 struct socket *so; 204 u_long cmd; 205 caddr_t data; 206 register struct ifnet *ifp; 207 struct thread *td; 208 { 209 register struct ifreq *ifr = (struct ifreq *)data; 210 register struct in_ifaddr *ia = 0, *iap; 211 register struct ifaddr *ifa; 212 struct in_addr dst; 213 struct in_ifaddr *oia; 214 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 215 struct sockaddr_in oldaddr; 216 int error, hostIsNew, iaIsNew, maskIsNew, s; 217 218 iaIsNew = 0; 219 220 switch (cmd) { 221 case SIOCALIFADDR: 222 case SIOCDLIFADDR: 223 if (td && (error = suser(td)) != 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, td); 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, if possible. 237 */ 238 if (ifp) { 239 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 240 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 241 if (iap->ia_ifp == ifp && 242 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 243 ia = iap; 244 break; 245 } 246 if (ia == NULL) 247 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 248 iap = ifatoia(ifa); 249 if (iap->ia_addr.sin_family == AF_INET) { 250 ia = iap; 251 break; 252 } 253 } 254 } 255 256 switch (cmd) { 257 258 case SIOCAIFADDR: 259 case SIOCDIFADDR: 260 if (ifp == 0) 261 return (EADDRNOTAVAIL); 262 if (ifra->ifra_addr.sin_family == AF_INET) { 263 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 264 if (ia->ia_ifp == ifp && 265 ia->ia_addr.sin_addr.s_addr == 266 ifra->ifra_addr.sin_addr.s_addr) 267 break; 268 } 269 if ((ifp->if_flags & IFF_POINTOPOINT) 270 && (cmd == SIOCAIFADDR) 271 && (ifra->ifra_dstaddr.sin_addr.s_addr 272 == INADDR_ANY)) { 273 return EDESTADDRREQ; 274 } 275 } 276 if (cmd == SIOCDIFADDR && ia == 0) 277 return (EADDRNOTAVAIL); 278 /* FALLTHROUGH */ 279 case SIOCSIFADDR: 280 case SIOCSIFNETMASK: 281 case SIOCSIFDSTADDR: 282 if (td && (error = suser(td)) != 0) 283 return error; 284 285 if (ifp == 0) 286 return (EADDRNOTAVAIL); 287 if (ia == (struct in_ifaddr *)0) { 288 ia = (struct in_ifaddr *) 289 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 290 if (ia == (struct in_ifaddr *)NULL) 291 return (ENOBUFS); 292 /* 293 * Protect from ipintr() traversing address list 294 * while we're modifying it. 295 */ 296 s = splnet(); 297 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 298 299 ifa = &ia->ia_ifa; 300 IFA_LOCK_INIT(ifa); 301 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 302 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 303 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 304 ifa->ifa_refcnt = 1; 305 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 306 307 ia->ia_sockmask.sin_len = 8; 308 ia->ia_sockmask.sin_family = AF_INET; 309 if (ifp->if_flags & IFF_BROADCAST) { 310 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 311 ia->ia_broadaddr.sin_family = AF_INET; 312 } 313 ia->ia_ifp = ifp; 314 splx(s); 315 iaIsNew = 1; 316 } 317 break; 318 319 case SIOCSIFBRDADDR: 320 if (td && (error = suser(td)) != 0) 321 return error; 322 /* FALLTHROUGH */ 323 324 case SIOCGIFADDR: 325 case SIOCGIFNETMASK: 326 case SIOCGIFDSTADDR: 327 case SIOCGIFBRDADDR: 328 if (ia == (struct in_ifaddr *)0) 329 return (EADDRNOTAVAIL); 330 break; 331 } 332 switch (cmd) { 333 334 case SIOCGIFADDR: 335 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 336 return (0); 337 338 case SIOCGIFBRDADDR: 339 if ((ifp->if_flags & IFF_BROADCAST) == 0) 340 return (EINVAL); 341 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 342 return (0); 343 344 case SIOCGIFDSTADDR: 345 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 346 return (EINVAL); 347 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 348 return (0); 349 350 case SIOCGIFNETMASK: 351 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 352 return (0); 353 354 case SIOCSIFDSTADDR: 355 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 356 return (EINVAL); 357 oldaddr = ia->ia_dstaddr; 358 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 359 if (ifp->if_ioctl) { 360 IFF_LOCKGIANT(ifp); 361 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 362 (caddr_t)ia); 363 IFF_UNLOCKGIANT(ifp); 364 if (error) { 365 ia->ia_dstaddr = oldaddr; 366 return (error); 367 } 368 } 369 if (ia->ia_flags & IFA_ROUTE) { 370 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 371 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 372 ia->ia_ifa.ifa_dstaddr = 373 (struct sockaddr *)&ia->ia_dstaddr; 374 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 375 } 376 return (0); 377 378 case SIOCSIFBRDADDR: 379 if ((ifp->if_flags & IFF_BROADCAST) == 0) 380 return (EINVAL); 381 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 382 return (0); 383 384 case SIOCSIFADDR: 385 error = in_ifinit(ifp, ia, 386 (struct sockaddr_in *) &ifr->ifr_addr, 1); 387 if (error != 0 && iaIsNew) 388 break; 389 if (error == 0) 390 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 391 return (0); 392 393 case SIOCSIFNETMASK: 394 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 395 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 396 return (0); 397 398 case SIOCAIFADDR: 399 maskIsNew = 0; 400 hostIsNew = 1; 401 error = 0; 402 if (ia->ia_addr.sin_family == AF_INET) { 403 if (ifra->ifra_addr.sin_len == 0) { 404 ifra->ifra_addr = ia->ia_addr; 405 hostIsNew = 0; 406 } else if (ifra->ifra_addr.sin_addr.s_addr == 407 ia->ia_addr.sin_addr.s_addr) 408 hostIsNew = 0; 409 } 410 if (ifra->ifra_mask.sin_len) { 411 in_ifscrub(ifp, ia); 412 ia->ia_sockmask = ifra->ifra_mask; 413 ia->ia_sockmask.sin_family = AF_INET; 414 ia->ia_subnetmask = 415 ntohl(ia->ia_sockmask.sin_addr.s_addr); 416 maskIsNew = 1; 417 } 418 if ((ifp->if_flags & IFF_POINTOPOINT) && 419 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 420 in_ifscrub(ifp, ia); 421 ia->ia_dstaddr = ifra->ifra_dstaddr; 422 maskIsNew = 1; /* We lie; but the effect's the same */ 423 } 424 if (ifra->ifra_addr.sin_family == AF_INET && 425 (hostIsNew || maskIsNew)) 426 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 427 if (error != 0 && iaIsNew) 428 break; 429 430 if ((ifp->if_flags & IFF_BROADCAST) && 431 (ifra->ifra_broadaddr.sin_family == AF_INET)) 432 ia->ia_broadaddr = ifra->ifra_broadaddr; 433 if (error == 0) 434 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 435 return (error); 436 437 case SIOCDIFADDR: 438 /* 439 * in_ifscrub kills the interface route. 440 */ 441 in_ifscrub(ifp, ia); 442 /* 443 * in_ifadown gets rid of all the rest of 444 * the routes. This is not quite the right 445 * thing to do, but at least if we are running 446 * a routing process they will come back. 447 */ 448 in_ifadown(&ia->ia_ifa, 1); 449 /* 450 * XXX horrible hack to detect that we are being called 451 * from if_detach() 452 */ 453 if (ifaddr_byindex(ifp->if_index) == NULL) { 454 in_pcbpurgeif0(&ripcbinfo, ifp); 455 in_pcbpurgeif0(&udbinfo, ifp); 456 } 457 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 458 error = 0; 459 break; 460 461 default: 462 if (ifp == 0 || ifp->if_ioctl == 0) 463 return (EOPNOTSUPP); 464 IFF_LOCKGIANT(ifp); 465 error = (*ifp->if_ioctl)(ifp, cmd, data); 466 IFF_UNLOCKGIANT(ifp); 467 return (error); 468 } 469 470 /* 471 * Protect from ipintr() traversing address list while we're modifying 472 * it. 473 */ 474 s = splnet(); 475 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 476 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 477 LIST_REMOVE(ia, ia_hash); 478 IFAFREE(&ia->ia_ifa); 479 splx(s); 480 481 return (error); 482 } 483 484 /* 485 * SIOC[GAD]LIFADDR. 486 * SIOCGLIFADDR: get first address. (?!?) 487 * SIOCGLIFADDR with IFLR_PREFIX: 488 * get first address that matches the specified prefix. 489 * SIOCALIFADDR: add the specified address. 490 * SIOCALIFADDR with IFLR_PREFIX: 491 * EINVAL since we can't deduce hostid part of the address. 492 * SIOCDLIFADDR: delete the specified address. 493 * SIOCDLIFADDR with IFLR_PREFIX: 494 * delete the first address that matches the specified prefix. 495 * return values: 496 * EINVAL on invalid parameters 497 * EADDRNOTAVAIL on prefix match failed/specified address not found 498 * other values may be returned from in_ioctl() 499 */ 500 static int 501 in_lifaddr_ioctl(so, cmd, data, ifp, td) 502 struct socket *so; 503 u_long cmd; 504 caddr_t data; 505 struct ifnet *ifp; 506 struct thread *td; 507 { 508 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 509 struct ifaddr *ifa; 510 511 /* sanity checks */ 512 if (!data || !ifp) { 513 panic("invalid argument to in_lifaddr_ioctl"); 514 /*NOTRECHED*/ 515 } 516 517 switch (cmd) { 518 case SIOCGLIFADDR: 519 /* address must be specified on GET with IFLR_PREFIX */ 520 if ((iflr->flags & IFLR_PREFIX) == 0) 521 break; 522 /*FALLTHROUGH*/ 523 case SIOCALIFADDR: 524 case SIOCDLIFADDR: 525 /* address must be specified on ADD and DELETE */ 526 if (iflr->addr.ss_family != AF_INET) 527 return EINVAL; 528 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 529 return EINVAL; 530 /* XXX need improvement */ 531 if (iflr->dstaddr.ss_family 532 && iflr->dstaddr.ss_family != AF_INET) 533 return EINVAL; 534 if (iflr->dstaddr.ss_family 535 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 536 return EINVAL; 537 break; 538 default: /*shouldn't happen*/ 539 return EOPNOTSUPP; 540 } 541 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 542 return EINVAL; 543 544 switch (cmd) { 545 case SIOCALIFADDR: 546 { 547 struct in_aliasreq ifra; 548 549 if (iflr->flags & IFLR_PREFIX) 550 return EINVAL; 551 552 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 553 bzero(&ifra, sizeof(ifra)); 554 bcopy(iflr->iflr_name, ifra.ifra_name, 555 sizeof(ifra.ifra_name)); 556 557 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 558 559 if (iflr->dstaddr.ss_family) { /*XXX*/ 560 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 561 iflr->dstaddr.ss_len); 562 } 563 564 ifra.ifra_mask.sin_family = AF_INET; 565 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 566 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 567 568 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 569 } 570 case SIOCGLIFADDR: 571 case SIOCDLIFADDR: 572 { 573 struct in_ifaddr *ia; 574 struct in_addr mask, candidate, match; 575 struct sockaddr_in *sin; 576 int cmp; 577 578 bzero(&mask, sizeof(mask)); 579 if (iflr->flags & IFLR_PREFIX) { 580 /* lookup a prefix rather than address. */ 581 in_len2mask(&mask, iflr->prefixlen); 582 583 sin = (struct sockaddr_in *)&iflr->addr; 584 match.s_addr = sin->sin_addr.s_addr; 585 match.s_addr &= mask.s_addr; 586 587 /* if you set extra bits, that's wrong */ 588 if (match.s_addr != sin->sin_addr.s_addr) 589 return EINVAL; 590 591 cmp = 1; 592 } else { 593 if (cmd == SIOCGLIFADDR) { 594 /* on getting an address, take the 1st match */ 595 cmp = 0; /*XXX*/ 596 } else { 597 /* on deleting an address, do exact match */ 598 in_len2mask(&mask, 32); 599 sin = (struct sockaddr_in *)&iflr->addr; 600 match.s_addr = sin->sin_addr.s_addr; 601 602 cmp = 1; 603 } 604 } 605 606 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 607 if (ifa->ifa_addr->sa_family != AF_INET6) 608 continue; 609 if (!cmp) 610 break; 611 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 612 candidate.s_addr &= mask.s_addr; 613 if (candidate.s_addr == match.s_addr) 614 break; 615 } 616 if (!ifa) 617 return EADDRNOTAVAIL; 618 ia = (struct in_ifaddr *)ifa; 619 620 if (cmd == SIOCGLIFADDR) { 621 /* fill in the if_laddrreq structure */ 622 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 623 624 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 625 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 626 ia->ia_dstaddr.sin_len); 627 } else 628 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 629 630 iflr->prefixlen = 631 in_mask2len(&ia->ia_sockmask.sin_addr); 632 633 iflr->flags = 0; /*XXX*/ 634 635 return 0; 636 } else { 637 struct in_aliasreq ifra; 638 639 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 640 bzero(&ifra, sizeof(ifra)); 641 bcopy(iflr->iflr_name, ifra.ifra_name, 642 sizeof(ifra.ifra_name)); 643 644 bcopy(&ia->ia_addr, &ifra.ifra_addr, 645 ia->ia_addr.sin_len); 646 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 647 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 648 ia->ia_dstaddr.sin_len); 649 } 650 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 651 ia->ia_sockmask.sin_len); 652 653 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 654 ifp, td); 655 } 656 } 657 } 658 659 return EOPNOTSUPP; /*just for safety*/ 660 } 661 662 /* 663 * Delete any existing route for an interface. 664 */ 665 void 666 in_ifscrub(ifp, ia) 667 register struct ifnet *ifp; 668 register struct in_ifaddr *ia; 669 { 670 in_scrubprefix(ia); 671 } 672 673 /* 674 * Initialize an interface's internet address 675 * and routing table entry. 676 */ 677 static int 678 in_ifinit(ifp, ia, sin, scrub) 679 register struct ifnet *ifp; 680 register struct in_ifaddr *ia; 681 struct sockaddr_in *sin; 682 int scrub; 683 { 684 register u_long i = ntohl(sin->sin_addr.s_addr); 685 struct sockaddr_in oldaddr; 686 int s = splimp(), flags = RTF_UP, error = 0; 687 688 oldaddr = ia->ia_addr; 689 if (oldaddr.sin_family == AF_INET) 690 LIST_REMOVE(ia, ia_hash); 691 ia->ia_addr = *sin; 692 if (ia->ia_addr.sin_family == AF_INET) 693 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 694 ia, ia_hash); 695 /* 696 * Give the interface a chance to initialize 697 * if this is its first address, 698 * and to validate the address if necessary. 699 */ 700 if (ifp->if_ioctl) { 701 IFF_LOCKGIANT(ifp); 702 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 703 IFF_UNLOCKGIANT(ifp); 704 if (error) { 705 splx(s); 706 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 707 ia->ia_addr = oldaddr; 708 if (ia->ia_addr.sin_family == AF_INET) 709 LIST_INSERT_HEAD(INADDR_HASH( 710 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 711 return (error); 712 } 713 } 714 splx(s); 715 if (scrub) { 716 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 717 in_ifscrub(ifp, ia); 718 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 719 } 720 if (IN_CLASSA(i)) 721 ia->ia_netmask = IN_CLASSA_NET; 722 else if (IN_CLASSB(i)) 723 ia->ia_netmask = IN_CLASSB_NET; 724 else 725 ia->ia_netmask = IN_CLASSC_NET; 726 /* 727 * The subnet mask usually includes at least the standard network part, 728 * but may may be smaller in the case of supernetting. 729 * If it is set, we believe it. 730 */ 731 if (ia->ia_subnetmask == 0) { 732 ia->ia_subnetmask = ia->ia_netmask; 733 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 734 } else 735 ia->ia_netmask &= ia->ia_subnetmask; 736 ia->ia_net = i & ia->ia_netmask; 737 ia->ia_subnet = i & ia->ia_subnetmask; 738 in_socktrim(&ia->ia_sockmask); 739 #ifdef DEV_CARP 740 /* 741 * XXX: carp(4) does not have interface route 742 */ 743 if (ifp->if_type == IFT_CARP) 744 return (0); 745 #endif 746 /* 747 * Add route for the network. 748 */ 749 ia->ia_ifa.ifa_metric = ifp->if_metric; 750 if (ifp->if_flags & IFF_BROADCAST) { 751 ia->ia_broadaddr.sin_addr.s_addr = 752 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 753 ia->ia_netbroadcast.s_addr = 754 htonl(ia->ia_net | ~ ia->ia_netmask); 755 } else if (ifp->if_flags & IFF_LOOPBACK) { 756 ia->ia_dstaddr = ia->ia_addr; 757 flags |= RTF_HOST; 758 } else if (ifp->if_flags & IFF_POINTOPOINT) { 759 if (ia->ia_dstaddr.sin_family != AF_INET) 760 return (0); 761 flags |= RTF_HOST; 762 } 763 if ((error = in_addprefix(ia, flags)) != 0) 764 return (error); 765 766 /* 767 * If the interface supports multicast, join the "all hosts" 768 * multicast group on that interface. 769 */ 770 if (ifp->if_flags & IFF_MULTICAST) { 771 struct in_addr addr; 772 773 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 774 in_addmulti(&addr, ifp); 775 } 776 return (error); 777 } 778 779 #define rtinitflags(x) \ 780 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 781 ? RTF_HOST : 0) 782 /* 783 * Check if we have a route for the given prefix already or add a one 784 * accordingly. 785 */ 786 static int 787 in_addprefix(target, flags) 788 struct in_ifaddr *target; 789 int flags; 790 { 791 struct in_ifaddr *ia; 792 struct in_addr prefix, mask, p; 793 int error; 794 795 if ((flags & RTF_HOST) != 0) 796 prefix = target->ia_dstaddr.sin_addr; 797 else { 798 prefix = target->ia_addr.sin_addr; 799 mask = target->ia_sockmask.sin_addr; 800 prefix.s_addr &= mask.s_addr; 801 } 802 803 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 804 if (rtinitflags(ia)) 805 p = ia->ia_dstaddr.sin_addr; 806 else { 807 p = ia->ia_addr.sin_addr; 808 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 809 } 810 811 if (prefix.s_addr != p.s_addr) 812 continue; 813 814 /* 815 * If we got a matching prefix route inserted by other 816 * interface address, we are done here. 817 */ 818 if (ia->ia_flags & IFA_ROUTE) 819 return 0; 820 } 821 822 /* 823 * No-one seem to have this prefix route, so we try to insert it. 824 */ 825 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 826 if (!error) 827 target->ia_flags |= IFA_ROUTE; 828 return error; 829 } 830 831 /* 832 * If there is no other address in the system that can serve a route to the 833 * same prefix, remove the route. Hand over the route to the new address 834 * otherwise. 835 */ 836 static int 837 in_scrubprefix(target) 838 struct in_ifaddr *target; 839 { 840 struct in_ifaddr *ia; 841 struct in_addr prefix, mask, p; 842 int error; 843 844 if ((target->ia_flags & IFA_ROUTE) == 0) 845 return 0; 846 847 if (rtinitflags(target)) 848 prefix = target->ia_dstaddr.sin_addr; 849 else { 850 prefix = target->ia_addr.sin_addr; 851 mask = target->ia_sockmask.sin_addr; 852 prefix.s_addr &= mask.s_addr; 853 } 854 855 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 856 if (rtinitflags(ia)) 857 p = ia->ia_dstaddr.sin_addr; 858 else { 859 p = ia->ia_addr.sin_addr; 860 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 861 } 862 863 if (prefix.s_addr != p.s_addr) 864 continue; 865 866 /* 867 * If we got a matching prefix address, move IFA_ROUTE and 868 * the route itself to it. Make sure that routing daemons 869 * get a heads-up. 870 * 871 * XXX: a special case for carp(4) interface 872 */ 873 if ((ia->ia_flags & IFA_ROUTE) == 0 874 #ifdef DEV_CARP 875 && (ia->ia_ifp->if_type != IFT_CARP) 876 #endif 877 ) { 878 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 879 rtinitflags(target)); 880 target->ia_flags &= ~IFA_ROUTE; 881 882 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 883 rtinitflags(ia) | RTF_UP); 884 if (error == 0) 885 ia->ia_flags |= IFA_ROUTE; 886 return error; 887 } 888 } 889 890 /* 891 * As no-one seem to have this prefix, we can remove the route. 892 */ 893 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 894 target->ia_flags &= ~IFA_ROUTE; 895 return 0; 896 } 897 898 #undef rtinitflags 899 900 /* 901 * Return 1 if the address might be a local broadcast address. 902 */ 903 int 904 in_broadcast(in, ifp) 905 struct in_addr in; 906 struct ifnet *ifp; 907 { 908 register struct ifaddr *ifa; 909 u_long t; 910 911 if (in.s_addr == INADDR_BROADCAST || 912 in.s_addr == INADDR_ANY) 913 return 1; 914 if ((ifp->if_flags & IFF_BROADCAST) == 0) 915 return 0; 916 t = ntohl(in.s_addr); 917 /* 918 * Look through the list of addresses for a match 919 * with a broadcast address. 920 */ 921 #define ia ((struct in_ifaddr *)ifa) 922 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 923 if (ifa->ifa_addr->sa_family == AF_INET && 924 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 925 in.s_addr == ia->ia_netbroadcast.s_addr || 926 /* 927 * Check for old-style (host 0) broadcast. 928 */ 929 t == ia->ia_subnet || t == ia->ia_net) && 930 /* 931 * Check for an all one subnetmask. These 932 * only exist when an interface gets a secondary 933 * address. 934 */ 935 ia->ia_subnetmask != (u_long)0xffffffff) 936 return 1; 937 return (0); 938 #undef ia 939 } 940 /* 941 * Add an address to the list of IP multicast addresses for a given interface. 942 */ 943 struct in_multi * 944 in_addmulti(ap, ifp) 945 register struct in_addr *ap; 946 register struct ifnet *ifp; 947 { 948 register struct in_multi *inm; 949 int error; 950 struct sockaddr_in sin; 951 struct ifmultiaddr *ifma; 952 int s = splnet(); 953 954 /* 955 * Call generic routine to add membership or increment 956 * refcount. It wants addresses in the form of a sockaddr, 957 * so we build one here (being careful to zero the unused bytes). 958 */ 959 bzero(&sin, sizeof sin); 960 sin.sin_family = AF_INET; 961 sin.sin_len = sizeof sin; 962 sin.sin_addr = *ap; 963 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 964 if (error) { 965 splx(s); 966 return 0; 967 } 968 969 /* 970 * If ifma->ifma_protospec is null, then if_addmulti() created 971 * a new record. Otherwise, we are done. 972 */ 973 if (ifma->ifma_protospec != NULL) { 974 splx(s); 975 return ifma->ifma_protospec; 976 } 977 978 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 979 at interrupt time? If so, need to fix if_addmulti. XXX */ 980 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, 981 M_NOWAIT | M_ZERO); 982 if (inm == NULL) { 983 splx(s); 984 return (NULL); 985 } 986 987 inm->inm_addr = *ap; 988 inm->inm_ifp = ifp; 989 inm->inm_ifma = ifma; 990 ifma->ifma_protospec = inm; 991 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 992 993 /* 994 * Let IGMP know that we have joined a new IP multicast group. 995 */ 996 igmp_joingroup(inm); 997 splx(s); 998 return (inm); 999 } 1000 1001 /* 1002 * Delete a multicast address record. 1003 */ 1004 void 1005 in_delmulti(inm) 1006 register struct in_multi *inm; 1007 { 1008 struct ifmultiaddr *ifma = inm->inm_ifma; 1009 struct in_multi my_inm; 1010 int s = splnet(); 1011 1012 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1013 if (ifma->ifma_refcount == 1) { 1014 /* 1015 * No remaining claims to this record; let IGMP know that 1016 * we are leaving the multicast group. 1017 * But do it after the if_delmulti() which might reset 1018 * the interface and nuke the packet. 1019 */ 1020 my_inm = *inm ; 1021 ifma->ifma_protospec = NULL; 1022 LIST_REMOVE(inm, inm_link); 1023 free(inm, M_IPMADDR); 1024 } 1025 /* XXX - should be separate API for when we have an ifma? */ 1026 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1027 if (my_inm.inm_ifp != NULL) 1028 igmp_leavegroup(&my_inm); 1029 splx(s); 1030 } 1031