1 /* $NetBSD: in.c,v 1.124 2008/04/10 18:09:14 dyoung Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1998 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to The NetBSD Foundation 37 * by Public Access Networks Corporation ("Panix"). It was developed under 38 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the NetBSD 51 * Foundation, Inc. and its contributors. 52 * 4. Neither the name of The NetBSD Foundation nor the names of its 53 * contributors may be used to endorse or promote products derived 54 * from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 57 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 58 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 59 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 60 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 61 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 62 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 63 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 64 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 65 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69 /* 70 * Copyright (c) 1982, 1986, 1991, 1993 71 * The Regents of the University of California. All rights reserved. 72 * 73 * Redistribution and use in source and binary forms, with or without 74 * modification, are permitted provided that the following conditions 75 * are met: 76 * 1. Redistributions of source code must retain the above copyright 77 * notice, this list of conditions and the following disclaimer. 78 * 2. Redistributions in binary form must reproduce the above copyright 79 * notice, this list of conditions and the following disclaimer in the 80 * documentation and/or other materials provided with the distribution. 81 * 3. Neither the name of the University nor the names of its contributors 82 * may be used to endorse or promote products derived from this software 83 * without specific prior written permission. 84 * 85 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 86 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 87 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 88 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 89 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 90 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 91 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 92 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 93 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 94 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 95 * SUCH DAMAGE. 96 * 97 * @(#)in.c 8.4 (Berkeley) 1/9/95 98 */ 99 100 #include <sys/cdefs.h> 101 __KERNEL_RCSID(0, "$NetBSD: in.c,v 1.124 2008/04/10 18:09:14 dyoung Exp $"); 102 103 #include "opt_inet.h" 104 #include "opt_inet_conf.h" 105 #include "opt_mrouting.h" 106 #include "opt_pfil_hooks.h" 107 108 #include <sys/param.h> 109 #include <sys/ioctl.h> 110 #include <sys/errno.h> 111 #include <sys/malloc.h> 112 #include <sys/socket.h> 113 #include <sys/socketvar.h> 114 #include <sys/sysctl.h> 115 #include <sys/systm.h> 116 #include <sys/proc.h> 117 #include <sys/syslog.h> 118 #include <sys/kauth.h> 119 120 #include <net/if.h> 121 #include <net/route.h> 122 123 #include <net/if_ether.h> 124 125 #include <netinet/in_systm.h> 126 #include <netinet/in.h> 127 #include <netinet/in_var.h> 128 #include <netinet/ip.h> 129 #include <netinet/ip_var.h> 130 #include <netinet/in_ifattach.h> 131 #include <netinet/in_pcb.h> 132 #include <netinet/if_inarp.h> 133 #include <netinet/ip_mroute.h> 134 #include <netinet/igmp_var.h> 135 136 #ifdef IPSELSRC 137 #include <netinet/in_selsrc.h> 138 #endif 139 140 #ifdef PFIL_HOOKS 141 #include <net/pfil.h> 142 #endif 143 144 #ifdef INET 145 static u_int in_mask2len(struct in_addr *); 146 static void in_len2mask(struct in_addr *, u_int); 147 static int in_lifaddr_ioctl(struct socket *, u_long, void *, 148 struct ifnet *, struct lwp *); 149 150 static int in_ifaddrpref_ioctl(struct socket *, u_long, void *, 151 struct ifnet *); 152 static int in_addprefix(struct in_ifaddr *, int); 153 static int in_scrubprefix(struct in_ifaddr *); 154 155 #ifndef SUBNETSARELOCAL 156 #define SUBNETSARELOCAL 1 157 #endif 158 159 #ifndef HOSTZEROBROADCAST 160 #define HOSTZEROBROADCAST 1 161 #endif 162 163 int subnetsarelocal = SUBNETSARELOCAL; 164 int hostzeroisbroadcast = HOSTZEROBROADCAST; 165 166 /* 167 * This list is used to keep track of in_multi chains which belong to 168 * deleted interface addresses. We use in_ifaddr so that a chain head 169 * won't be deallocated until all multicast address record are deleted. 170 */ 171 static TAILQ_HEAD(, in_ifaddr) in_mk = TAILQ_HEAD_INITIALIZER(in_mk); 172 173 /* 174 * Return 1 if an internet address is for a ``local'' host 175 * (one to which we have a connection). If subnetsarelocal 176 * is true, this includes other subnets of the local net. 177 * Otherwise, it includes only the directly-connected (sub)nets. 178 */ 179 int 180 in_localaddr(struct in_addr in) 181 { 182 struct in_ifaddr *ia; 183 184 if (subnetsarelocal) { 185 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) 186 if ((in.s_addr & ia->ia_netmask) == ia->ia_net) 187 return (1); 188 } else { 189 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) 190 if ((in.s_addr & ia->ia_subnetmask) == ia->ia_subnet) 191 return (1); 192 } 193 return (0); 194 } 195 196 /* 197 * Determine whether an IP address is in a reserved set of addresses 198 * that may not be forwarded, or whether datagrams to that destination 199 * may be forwarded. 200 */ 201 int 202 in_canforward(struct in_addr in) 203 { 204 u_int32_t net; 205 206 if (IN_EXPERIMENTAL(in.s_addr) || IN_MULTICAST(in.s_addr)) 207 return (0); 208 if (IN_CLASSA(in.s_addr)) { 209 net = in.s_addr & IN_CLASSA_NET; 210 if (net == 0 || net == htonl(IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 211 return (0); 212 } 213 return (1); 214 } 215 216 /* 217 * Trim a mask in a sockaddr 218 */ 219 void 220 in_socktrim(struct sockaddr_in *ap) 221 { 222 char *cplim = (char *) &ap->sin_addr; 223 char *cp = (char *) (&ap->sin_addr + 1); 224 225 ap->sin_len = 0; 226 while (--cp >= cplim) 227 if (*cp) { 228 (ap)->sin_len = cp - (char *) (ap) + 1; 229 break; 230 } 231 } 232 233 /* 234 * Routine to take an Internet address and convert into a 235 * "dotted quad" representation for printing. 236 */ 237 const char * 238 in_fmtaddr(struct in_addr addr) 239 { 240 static char buf[sizeof("123.456.789.123")]; 241 242 addr.s_addr = ntohl(addr.s_addr); 243 244 snprintf(buf, sizeof(buf), "%d.%d.%d.%d", 245 (addr.s_addr >> 24) & 0xFF, 246 (addr.s_addr >> 16) & 0xFF, 247 (addr.s_addr >> 8) & 0xFF, 248 (addr.s_addr >> 0) & 0xFF); 249 return buf; 250 } 251 252 /* 253 * Maintain the "in_maxmtu" variable, which is the largest 254 * mtu for non-local interfaces with AF_INET addresses assigned 255 * to them that are up. 256 */ 257 unsigned long in_maxmtu; 258 259 void 260 in_setmaxmtu(void) 261 { 262 struct in_ifaddr *ia; 263 struct ifnet *ifp; 264 unsigned long maxmtu = 0; 265 266 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 267 if ((ifp = ia->ia_ifp) == 0) 268 continue; 269 if ((ifp->if_flags & (IFF_UP|IFF_LOOPBACK)) != IFF_UP) 270 continue; 271 if (ifp->if_mtu > maxmtu) 272 maxmtu = ifp->if_mtu; 273 } 274 if (maxmtu) 275 in_maxmtu = maxmtu; 276 } 277 278 static u_int 279 in_mask2len(struct in_addr *mask) 280 { 281 u_int x, y; 282 u_char *p; 283 284 p = (u_char *)mask; 285 for (x = 0; x < sizeof(*mask); x++) { 286 if (p[x] != 0xff) 287 break; 288 } 289 y = 0; 290 if (x < sizeof(*mask)) { 291 for (y = 0; y < NBBY; y++) { 292 if ((p[x] & (0x80 >> y)) == 0) 293 break; 294 } 295 } 296 return x * NBBY + y; 297 } 298 299 static void 300 in_len2mask(struct in_addr *mask, u_int len) 301 { 302 u_int i; 303 u_char *p; 304 305 p = (u_char *)mask; 306 bzero(mask, sizeof(*mask)); 307 for (i = 0; i < len / NBBY; i++) 308 p[i] = 0xff; 309 if (len % NBBY) 310 p[i] = (0xff00 >> (len % NBBY)) & 0xff; 311 } 312 313 /* 314 * Generic internet control operations (ioctl's). 315 * Ifp is 0 if not an interface-specific ioctl. 316 */ 317 /* ARGSUSED */ 318 int 319 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, 320 struct lwp *l) 321 { 322 struct ifreq *ifr = (struct ifreq *)data; 323 struct in_ifaddr *ia = 0; 324 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 325 struct sockaddr_in oldaddr; 326 int error, hostIsNew, maskIsNew; 327 int newifaddr = 0; 328 329 switch (cmd) { 330 case SIOCALIFADDR: 331 case SIOCDLIFADDR: 332 case SIOCSIFADDRPREF: 333 if (l == NULL) 334 return (EPERM); 335 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 336 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 337 NULL) != 0) 338 return (EPERM); 339 /*FALLTHROUGH*/ 340 case SIOCGIFADDRPREF: 341 case SIOCGLIFADDR: 342 if (ifp == NULL) 343 return EINVAL; 344 if (cmd == SIOCGIFADDRPREF || cmd == SIOCSIFADDRPREF) 345 return in_ifaddrpref_ioctl(so, cmd, data, ifp); 346 else 347 return in_lifaddr_ioctl(so, cmd, data, ifp, l); 348 } 349 350 /* 351 * Find address for this interface, if it exists. 352 */ 353 if (ifp != NULL) 354 IFP_TO_IA(ifp, ia); 355 356 switch (cmd) { 357 358 case SIOCAIFADDR: 359 case SIOCDIFADDR: 360 case SIOCGIFALIAS: 361 if (ifra->ifra_addr.sin_family == AF_INET) 362 LIST_FOREACH(ia, 363 &IN_IFADDR_HASH(ifra->ifra_addr.sin_addr.s_addr), 364 ia_hash) { 365 if (ia->ia_ifp == ifp && 366 in_hosteq(ia->ia_addr.sin_addr, 367 ifra->ifra_addr.sin_addr)) 368 break; 369 } 370 if ((cmd == SIOCDIFADDR || cmd == SIOCGIFALIAS) && ia == NULL) 371 return (EADDRNOTAVAIL); 372 373 #if 1 /*def COMPAT_43*/ 374 if (cmd == SIOCDIFADDR && 375 ifra->ifra_addr.sin_family == AF_UNSPEC) { 376 ifra->ifra_addr.sin_family = AF_INET; 377 } 378 #endif 379 /* FALLTHROUGH */ 380 case SIOCSIFADDR: 381 case SIOCSIFDSTADDR: 382 if (ifra->ifra_addr.sin_family != AF_INET) 383 return (EAFNOSUPPORT); 384 /* FALLTHROUGH */ 385 case SIOCSIFNETMASK: 386 if (ifp == NULL) 387 panic("in_control"); 388 389 if (cmd == SIOCGIFALIAS) 390 break; 391 392 if (ia == NULL && 393 (cmd == SIOCSIFNETMASK || cmd == SIOCSIFDSTADDR)) 394 return (EADDRNOTAVAIL); 395 396 if (l == NULL) 397 return (EPERM); 398 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 399 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 400 NULL) != 0) 401 return (EPERM); 402 403 if (ia == 0) { 404 MALLOC(ia, struct in_ifaddr *, sizeof(*ia), 405 M_IFADDR, M_WAITOK); 406 if (ia == 0) 407 return (ENOBUFS); 408 bzero((void *)ia, sizeof *ia); 409 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_list); 410 IFAREF(&ia->ia_ifa); 411 ifa_insert(ifp, &ia->ia_ifa); 412 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 413 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 414 ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask); 415 #ifdef IPSELSRC 416 ia->ia_ifa.ifa_getifa = in_getifa; 417 #else /* IPSELSRC */ 418 ia->ia_ifa.ifa_getifa = NULL; 419 #endif /* IPSELSRC */ 420 ia->ia_sockmask.sin_len = 8; 421 if (ifp->if_flags & IFF_BROADCAST) { 422 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 423 ia->ia_broadaddr.sin_family = AF_INET; 424 } 425 ia->ia_ifp = ifp; 426 ia->ia_idsalt = arc4random() % 65535; 427 LIST_INIT(&ia->ia_multiaddrs); 428 newifaddr = 1; 429 } 430 break; 431 432 case SIOCSIFBRDADDR: 433 if (l == NULL) 434 return (EPERM); 435 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 436 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 437 NULL) != 0) 438 return (EPERM); 439 /* FALLTHROUGH */ 440 441 case SIOCGIFADDR: 442 case SIOCGIFNETMASK: 443 case SIOCGIFDSTADDR: 444 case SIOCGIFBRDADDR: 445 if (ia == 0) 446 return (EADDRNOTAVAIL); 447 break; 448 } 449 error = 0; 450 switch (cmd) { 451 452 case SIOCGIFADDR: 453 ifreq_setaddr(cmd, ifr, sintocsa(&ia->ia_addr)); 454 break; 455 456 case SIOCGIFBRDADDR: 457 if ((ifp->if_flags & IFF_BROADCAST) == 0) 458 return (EINVAL); 459 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_broadaddr)); 460 break; 461 462 case SIOCGIFDSTADDR: 463 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 464 return (EINVAL); 465 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_dstaddr)); 466 break; 467 468 case SIOCGIFNETMASK: 469 ifreq_setaddr(cmd, ifr, sintocsa(&ia->ia_sockmask)); 470 break; 471 472 case SIOCSIFDSTADDR: 473 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 474 return (EINVAL); 475 oldaddr = ia->ia_dstaddr; 476 ia->ia_dstaddr = *satocsin(ifreq_getdstaddr(cmd, ifr)); 477 if (ifp->if_ioctl != NULL && 478 (error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 479 (void *)ia)) != 0) { 480 ia->ia_dstaddr = oldaddr; 481 return error; 482 } 483 if (ia->ia_flags & IFA_ROUTE) { 484 ia->ia_ifa.ifa_dstaddr = sintosa(&oldaddr); 485 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 486 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 487 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST|RTF_UP); 488 } 489 break; 490 491 case SIOCSIFBRDADDR: 492 if ((ifp->if_flags & IFF_BROADCAST) == 0) 493 return EINVAL; 494 ia->ia_broadaddr = *satocsin(ifreq_getbroadaddr(cmd, ifr)); 495 break; 496 497 case SIOCSIFADDR: 498 error = in_ifinit(ifp, ia, satocsin(ifreq_getaddr(cmd, ifr)), 499 1); 500 #ifdef PFIL_HOOKS 501 if (error == 0) 502 (void)pfil_run_hooks(&if_pfil, 503 (struct mbuf **)SIOCSIFADDR, ifp, PFIL_IFADDR); 504 #endif 505 break; 506 507 case SIOCSIFNETMASK: 508 in_ifscrub(ifp, ia); 509 ia->ia_sockmask = *satocsin(ifreq_getaddr(cmd, ifr)); 510 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 511 error = in_ifinit(ifp, ia, NULL, 0); 512 break; 513 514 case SIOCAIFADDR: 515 maskIsNew = 0; 516 hostIsNew = 1; 517 if (ia->ia_addr.sin_family != AF_INET) 518 ; 519 else if (ifra->ifra_addr.sin_len == 0) { 520 ifra->ifra_addr = ia->ia_addr; 521 hostIsNew = 0; 522 } else if (in_hosteq(ia->ia_addr.sin_addr, 523 ifra->ifra_addr.sin_addr)) 524 hostIsNew = 0; 525 if (ifra->ifra_mask.sin_len) { 526 in_ifscrub(ifp, ia); 527 ia->ia_sockmask = ifra->ifra_mask; 528 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 529 maskIsNew = 1; 530 } 531 if ((ifp->if_flags & IFF_POINTOPOINT) && 532 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 533 in_ifscrub(ifp, ia); 534 ia->ia_dstaddr = ifra->ifra_dstaddr; 535 maskIsNew = 1; /* We lie; but the effect's the same */ 536 } 537 if (ifra->ifra_addr.sin_family == AF_INET && 538 (hostIsNew || maskIsNew)) { 539 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 540 } 541 if ((ifp->if_flags & IFF_BROADCAST) && 542 (ifra->ifra_broadaddr.sin_family == AF_INET)) 543 ia->ia_broadaddr = ifra->ifra_broadaddr; 544 #ifdef PFIL_HOOKS 545 if (error == 0) 546 (void)pfil_run_hooks(&if_pfil, 547 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 548 #endif 549 break; 550 551 case SIOCGIFALIAS: 552 ifra->ifra_mask = ia->ia_sockmask; 553 if ((ifp->if_flags & IFF_POINTOPOINT) && 554 (ia->ia_dstaddr.sin_family == AF_INET)) 555 ifra->ifra_dstaddr = ia->ia_dstaddr; 556 else if ((ifp->if_flags & IFF_BROADCAST) && 557 (ia->ia_broadaddr.sin_family == AF_INET)) 558 ifra->ifra_broadaddr = ia->ia_broadaddr; 559 else 560 memset(&ifra->ifra_broadaddr, 0, 561 sizeof(ifra->ifra_broadaddr)); 562 break; 563 564 case SIOCDIFADDR: 565 in_purgeaddr(&ia->ia_ifa); 566 #ifdef PFIL_HOOKS 567 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR, 568 ifp, PFIL_IFADDR); 569 #endif 570 break; 571 572 #ifdef MROUTING 573 case SIOCGETVIFCNT: 574 case SIOCGETSGCNT: 575 error = mrt_ioctl(so, cmd, data); 576 break; 577 #endif /* MROUTING */ 578 579 default: 580 if (ifp == NULL || ifp->if_ioctl == NULL) 581 return EOPNOTSUPP; 582 error = (*ifp->if_ioctl)(ifp, cmd, data); 583 in_setmaxmtu(); 584 break; 585 } 586 587 if (error != 0 && newifaddr) { 588 KASSERT(ia != NULL); 589 in_purgeaddr(&ia->ia_ifa); 590 } 591 592 return error; 593 } 594 595 void 596 in_purgeaddr(struct ifaddr *ifa) 597 { 598 struct ifnet *ifp = ifa->ifa_ifp; 599 struct in_ifaddr *ia = (void *) ifa; 600 601 in_ifscrub(ifp, ia); 602 LIST_REMOVE(ia, ia_hash); 603 ifa_remove(ifp, &ia->ia_ifa); 604 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_list); 605 if (ia->ia_allhosts != NULL) 606 in_delmulti(ia->ia_allhosts); 607 IFAFREE(&ia->ia_ifa); 608 in_setmaxmtu(); 609 } 610 611 void 612 in_purgeif(struct ifnet *ifp) /* MUST be called at splsoftnet() */ 613 { 614 if_purgeaddrs(ifp, AF_INET, in_purgeaddr); 615 igmp_purgeif(ifp); /* manipulates pools */ 616 #ifdef MROUTING 617 ip_mrouter_detach(ifp); 618 #endif 619 } 620 621 /* 622 * SIOC[GAD]LIFADDR. 623 * SIOCGLIFADDR: get first address. (???) 624 * SIOCGLIFADDR with IFLR_PREFIX: 625 * get first address that matches the specified prefix. 626 * SIOCALIFADDR: add the specified address. 627 * SIOCALIFADDR with IFLR_PREFIX: 628 * EINVAL since we can't deduce hostid part of the address. 629 * SIOCDLIFADDR: delete the specified address. 630 * SIOCDLIFADDR with IFLR_PREFIX: 631 * delete the first address that matches the specified prefix. 632 * return values: 633 * EINVAL on invalid parameters 634 * EADDRNOTAVAIL on prefix match failed/specified address not found 635 * other values may be returned from in_ioctl() 636 */ 637 static int 638 in_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 639 struct ifnet *ifp, struct lwp *l) 640 { 641 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 642 struct ifaddr *ifa; 643 struct sockaddr *sa; 644 645 /* sanity checks */ 646 if (data == NULL || ifp == NULL) { 647 panic("invalid argument to in_lifaddr_ioctl"); 648 /*NOTRECHED*/ 649 } 650 651 switch (cmd) { 652 case SIOCGLIFADDR: 653 /* address must be specified on GET with IFLR_PREFIX */ 654 if ((iflr->flags & IFLR_PREFIX) == 0) 655 break; 656 /*FALLTHROUGH*/ 657 case SIOCALIFADDR: 658 case SIOCDLIFADDR: 659 /* address must be specified on ADD and DELETE */ 660 sa = (struct sockaddr *)&iflr->addr; 661 if (sa->sa_family != AF_INET) 662 return EINVAL; 663 if (sa->sa_len != sizeof(struct sockaddr_in)) 664 return EINVAL; 665 /* XXX need improvement */ 666 sa = (struct sockaddr *)&iflr->dstaddr; 667 if (sa->sa_family 668 && sa->sa_family != AF_INET) 669 return EINVAL; 670 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in)) 671 return EINVAL; 672 break; 673 default: /*shouldn't happen*/ 674 #if 0 675 panic("invalid cmd to in_lifaddr_ioctl"); 676 /*NOTREACHED*/ 677 #else 678 return EOPNOTSUPP; 679 #endif 680 } 681 if (sizeof(struct in_addr) * NBBY < iflr->prefixlen) 682 return EINVAL; 683 684 switch (cmd) { 685 case SIOCALIFADDR: 686 { 687 struct in_aliasreq ifra; 688 689 if (iflr->flags & IFLR_PREFIX) 690 return EINVAL; 691 692 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ 693 bzero(&ifra, sizeof(ifra)); 694 bcopy(iflr->iflr_name, ifra.ifra_name, 695 sizeof(ifra.ifra_name)); 696 697 bcopy(&iflr->addr, &ifra.ifra_addr, 698 ((struct sockaddr *)&iflr->addr)->sa_len); 699 700 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 701 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 702 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 703 } 704 705 ifra.ifra_mask.sin_family = AF_INET; 706 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 707 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 708 709 return in_control(so, SIOCAIFADDR, (void *)&ifra, ifp, l); 710 } 711 case SIOCGLIFADDR: 712 case SIOCDLIFADDR: 713 { 714 struct in_ifaddr *ia; 715 struct in_addr mask, candidate, match; 716 struct sockaddr_in *sin; 717 int cmp; 718 719 bzero(&mask, sizeof(mask)); 720 bzero(&match, sizeof(match)); /* XXX gcc */ 721 if (iflr->flags & IFLR_PREFIX) { 722 /* lookup a prefix rather than address. */ 723 in_len2mask(&mask, iflr->prefixlen); 724 725 sin = (struct sockaddr_in *)&iflr->addr; 726 match.s_addr = sin->sin_addr.s_addr; 727 match.s_addr &= mask.s_addr; 728 729 /* if you set extra bits, that's wrong */ 730 if (match.s_addr != sin->sin_addr.s_addr) 731 return EINVAL; 732 733 cmp = 1; 734 } else { 735 if (cmd == SIOCGLIFADDR) { 736 /* on getting an address, take the 1st match */ 737 cmp = 0; /*XXX*/ 738 } else { 739 /* on deleting an address, do exact match */ 740 in_len2mask(&mask, 32); 741 sin = (struct sockaddr_in *)&iflr->addr; 742 match.s_addr = sin->sin_addr.s_addr; 743 744 cmp = 1; 745 } 746 } 747 748 IFADDR_FOREACH(ifa, ifp) { 749 if (ifa->ifa_addr->sa_family != AF_INET) 750 continue; 751 if (cmp == 0) 752 break; 753 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 754 candidate.s_addr &= mask.s_addr; 755 if (candidate.s_addr == match.s_addr) 756 break; 757 } 758 if (ifa == NULL) 759 return EADDRNOTAVAIL; 760 ia = (struct in_ifaddr *)ifa; 761 762 if (cmd == SIOCGLIFADDR) { 763 /* fill in the if_laddrreq structure */ 764 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 765 766 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 767 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 768 ia->ia_dstaddr.sin_len); 769 } else 770 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 771 772 iflr->prefixlen = 773 in_mask2len(&ia->ia_sockmask.sin_addr); 774 775 iflr->flags = 0; /*XXX*/ 776 777 return 0; 778 } else { 779 struct in_aliasreq ifra; 780 781 /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ 782 bzero(&ifra, sizeof(ifra)); 783 bcopy(iflr->iflr_name, ifra.ifra_name, 784 sizeof(ifra.ifra_name)); 785 786 bcopy(&ia->ia_addr, &ifra.ifra_addr, 787 ia->ia_addr.sin_len); 788 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 789 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 790 ia->ia_dstaddr.sin_len); 791 } 792 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 793 ia->ia_sockmask.sin_len); 794 795 return in_control(so, SIOCDIFADDR, (void *)&ifra, 796 ifp, l); 797 } 798 } 799 } 800 801 return EOPNOTSUPP; /*just for safety*/ 802 } 803 804 static int 805 in_ifaddrpref_ioctl(struct socket *so, u_long cmd, void *data, 806 struct ifnet *ifp) 807 { 808 struct if_addrprefreq *ifap = (struct if_addrprefreq *)data; 809 struct ifaddr *ifa; 810 struct sockaddr *sa; 811 struct in_ifaddr *ia = NULL; /* appease gcc -Wuninitialized */ 812 struct in_addr match; 813 struct sockaddr_in *sin; 814 815 /* sanity checks */ 816 if (data == NULL || ifp == NULL) { 817 panic("invalid argument to %s", __func__); 818 /*NOTREACHED*/ 819 } 820 821 /* address must be specified on ADD and DELETE */ 822 sa = (struct sockaddr *)&ifap->ifap_addr; 823 if (sa->sa_family != AF_INET) 824 return EINVAL; 825 if (sa->sa_len != sizeof(struct sockaddr_in)) 826 return EINVAL; 827 828 switch (cmd) { 829 case SIOCSIFADDRPREF: 830 case SIOCGIFADDRPREF: 831 break; 832 default: 833 return EOPNOTSUPP; 834 } 835 836 sin = (struct sockaddr_in *)&ifap->ifap_addr; 837 match.s_addr = sin->sin_addr.s_addr; 838 839 IFADDR_FOREACH(ifa, ifp) { 840 ia = (struct in_ifaddr *)ifa; 841 if (ia->ia_addr.sin_family != AF_INET) 842 continue; 843 if (ia->ia_addr.sin_addr.s_addr == match.s_addr) 844 break; 845 } 846 if (ifa == NULL) 847 return EADDRNOTAVAIL; 848 849 switch (cmd) { 850 case SIOCSIFADDRPREF: 851 ifa->ifa_preference = ifap->ifap_preference; 852 return 0; 853 case SIOCGIFADDRPREF: 854 /* fill in the if_laddrreq structure */ 855 (void)memcpy(&ifap->ifap_addr, &ia->ia_addr, 856 ia->ia_addr.sin_len); 857 ifap->ifap_preference = ifa->ifa_preference; 858 return 0; 859 default: 860 return EOPNOTSUPP; 861 } 862 } 863 864 /* 865 * Delete any existing route for an interface. 866 */ 867 void 868 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 869 { 870 871 in_scrubprefix(ia); 872 } 873 874 /* 875 * Initialize an interface's internet address 876 * and routing table entry. 877 */ 878 int 879 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 880 const struct sockaddr_in *sin, int scrub) 881 { 882 u_int32_t i; 883 struct sockaddr_in oldaddr; 884 int s = splnet(), flags = RTF_UP, error; 885 886 if (sin == NULL) 887 sin = &ia->ia_addr; 888 889 /* 890 * Set up new addresses. 891 */ 892 oldaddr = ia->ia_addr; 893 if (ia->ia_addr.sin_family == AF_INET) 894 LIST_REMOVE(ia, ia_hash); 895 ia->ia_addr = *sin; 896 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 897 898 /* 899 * Give the interface a chance to initialize 900 * if this is its first address, 901 * and to validate the address if necessary. 902 */ 903 if (ifp->if_ioctl && 904 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (void *)ia))) 905 goto bad; 906 splx(s); 907 if (scrub) { 908 ia->ia_ifa.ifa_addr = sintosa(&oldaddr); 909 in_ifscrub(ifp, ia); 910 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 911 } 912 913 i = ia->ia_addr.sin_addr.s_addr; 914 if (IN_CLASSA(i)) 915 ia->ia_netmask = IN_CLASSA_NET; 916 else if (IN_CLASSB(i)) 917 ia->ia_netmask = IN_CLASSB_NET; 918 else 919 ia->ia_netmask = IN_CLASSC_NET; 920 /* 921 * The subnet mask usually includes at least the standard network part, 922 * but may may be smaller in the case of supernetting. 923 * If it is set, we believe it. 924 */ 925 if (ia->ia_subnetmask == 0) { 926 ia->ia_subnetmask = ia->ia_netmask; 927 ia->ia_sockmask.sin_addr.s_addr = ia->ia_subnetmask; 928 } else 929 ia->ia_netmask &= ia->ia_subnetmask; 930 931 ia->ia_net = i & ia->ia_netmask; 932 ia->ia_subnet = i & ia->ia_subnetmask; 933 in_socktrim(&ia->ia_sockmask); 934 /* re-calculate the "in_maxmtu" value */ 935 in_setmaxmtu(); 936 /* 937 * Add route for the network. 938 */ 939 ia->ia_ifa.ifa_metric = ifp->if_metric; 940 if (ifp->if_flags & IFF_BROADCAST) { 941 ia->ia_broadaddr.sin_addr.s_addr = 942 ia->ia_subnet | ~ia->ia_subnetmask; 943 ia->ia_netbroadcast.s_addr = 944 ia->ia_net | ~ia->ia_netmask; 945 } else if (ifp->if_flags & IFF_LOOPBACK) { 946 ia->ia_dstaddr = ia->ia_addr; 947 flags |= RTF_HOST; 948 } else if (ifp->if_flags & IFF_POINTOPOINT) { 949 if (ia->ia_dstaddr.sin_family != AF_INET) 950 return (0); 951 flags |= RTF_HOST; 952 } 953 error = in_addprefix(ia, flags); 954 /* 955 * If the interface supports multicast, join the "all hosts" 956 * multicast group on that interface. 957 */ 958 if ((ifp->if_flags & IFF_MULTICAST) != 0 && ia->ia_allhosts == NULL) { 959 struct in_addr addr; 960 961 addr.s_addr = INADDR_ALLHOSTS_GROUP; 962 ia->ia_allhosts = in_addmulti(&addr, ifp); 963 } 964 return (error); 965 bad: 966 splx(s); 967 LIST_REMOVE(ia, ia_hash); 968 ia->ia_addr = oldaddr; 969 if (ia->ia_addr.sin_family == AF_INET) 970 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), 971 ia, ia_hash); 972 return (error); 973 } 974 975 #define rtinitflags(x) \ 976 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 977 ? RTF_HOST : 0) 978 979 /* 980 * add a route to prefix ("connected route" in cisco terminology). 981 * does nothing if there's some interface address with the same prefix already. 982 */ 983 static int 984 in_addprefix(struct in_ifaddr *target, int flags) 985 { 986 struct in_ifaddr *ia; 987 struct in_addr prefix, mask, p; 988 int error; 989 990 if ((flags & RTF_HOST) != 0) 991 prefix = target->ia_dstaddr.sin_addr; 992 else { 993 prefix = target->ia_addr.sin_addr; 994 mask = target->ia_sockmask.sin_addr; 995 prefix.s_addr &= mask.s_addr; 996 } 997 998 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 999 if (rtinitflags(ia)) 1000 p = ia->ia_dstaddr.sin_addr; 1001 else { 1002 p = ia->ia_addr.sin_addr; 1003 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1004 } 1005 1006 if (prefix.s_addr != p.s_addr) 1007 continue; 1008 1009 /* 1010 * if we got a matching prefix route inserted by other 1011 * interface address, we don't need to bother 1012 * 1013 * XXX RADIX_MPATH implications here? -dyoung 1014 */ 1015 if (ia->ia_flags & IFA_ROUTE) 1016 return 0; 1017 } 1018 1019 /* 1020 * noone seem to have prefix route. insert it. 1021 */ 1022 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1023 if (error == 0) 1024 target->ia_flags |= IFA_ROUTE; 1025 return error; 1026 } 1027 1028 /* 1029 * remove a route to prefix ("connected route" in cisco terminology). 1030 * re-installs the route by using another interface address, if there's one 1031 * with the same prefix (otherwise we lose the route mistakenly). 1032 */ 1033 static int 1034 in_scrubprefix(struct in_ifaddr *target) 1035 { 1036 struct in_ifaddr *ia; 1037 struct in_addr prefix, mask, p; 1038 int error; 1039 1040 if ((target->ia_flags & IFA_ROUTE) == 0) 1041 return 0; 1042 1043 if (rtinitflags(target)) 1044 prefix = target->ia_dstaddr.sin_addr; 1045 else { 1046 prefix = target->ia_addr.sin_addr; 1047 mask = target->ia_sockmask.sin_addr; 1048 prefix.s_addr &= mask.s_addr; 1049 } 1050 1051 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 1052 if (rtinitflags(ia)) 1053 p = ia->ia_dstaddr.sin_addr; 1054 else { 1055 p = ia->ia_addr.sin_addr; 1056 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1057 } 1058 1059 if (prefix.s_addr != p.s_addr) 1060 continue; 1061 1062 /* 1063 * if we got a matching prefix route, move IFA_ROUTE to him 1064 */ 1065 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1066 rtinit(&target->ia_ifa, RTM_DELETE, 1067 rtinitflags(target)); 1068 target->ia_flags &= ~IFA_ROUTE; 1069 1070 error = rtinit(&ia->ia_ifa, RTM_ADD, 1071 rtinitflags(ia) | RTF_UP); 1072 if (error == 0) 1073 ia->ia_flags |= IFA_ROUTE; 1074 return error; 1075 } 1076 } 1077 1078 /* 1079 * noone seem to have prefix route. remove it. 1080 */ 1081 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1082 target->ia_flags &= ~IFA_ROUTE; 1083 return 0; 1084 } 1085 1086 #undef rtinitflags 1087 1088 /* 1089 * Return 1 if the address might be a local broadcast address. 1090 */ 1091 int 1092 in_broadcast(struct in_addr in, struct ifnet *ifp) 1093 { 1094 struct ifaddr *ifa; 1095 1096 if (in.s_addr == INADDR_BROADCAST || 1097 in_nullhost(in)) 1098 return 1; 1099 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1100 return 0; 1101 /* 1102 * Look through the list of addresses for a match 1103 * with a broadcast address. 1104 */ 1105 #define ia (ifatoia(ifa)) 1106 IFADDR_FOREACH(ifa, ifp) 1107 if (ifa->ifa_addr->sa_family == AF_INET && 1108 !in_hosteq(in, ia->ia_addr.sin_addr) && 1109 (in_hosteq(in, ia->ia_broadaddr.sin_addr) || 1110 in_hosteq(in, ia->ia_netbroadcast) || 1111 (hostzeroisbroadcast && 1112 /* 1113 * Check for old-style (host 0) broadcast. 1114 */ 1115 (in.s_addr == ia->ia_subnet || 1116 in.s_addr == ia->ia_net)))) 1117 return 1; 1118 return (0); 1119 #undef ia 1120 } 1121 1122 /* 1123 * Add an address to the list of IP multicast addresses for a given interface. 1124 */ 1125 struct in_multi * 1126 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1127 { 1128 struct sockaddr_in sin; 1129 struct in_multi *inm; 1130 struct ifreq ifr; 1131 int s = splsoftnet(); 1132 1133 /* 1134 * See if address already in list. 1135 */ 1136 IN_LOOKUP_MULTI(*ap, ifp, inm); 1137 if (inm != NULL) { 1138 /* 1139 * Found it; just increment the reference count. 1140 */ 1141 ++inm->inm_refcount; 1142 } else { 1143 /* 1144 * New address; allocate a new multicast record 1145 * and link it into the interface's multicast list. 1146 */ 1147 inm = pool_get(&inmulti_pool, PR_NOWAIT); 1148 if (inm == NULL) { 1149 splx(s); 1150 return (NULL); 1151 } 1152 inm->inm_addr = *ap; 1153 inm->inm_ifp = ifp; 1154 inm->inm_refcount = 1; 1155 LIST_INSERT_HEAD( 1156 &IN_MULTI_HASH(inm->inm_addr.s_addr, ifp), 1157 inm, inm_list); 1158 /* 1159 * Ask the network driver to update its multicast reception 1160 * filter appropriately for the new address. 1161 */ 1162 sockaddr_in_init(&sin, ap, 0); 1163 ifreq_setaddr(SIOCADDMULTI, &ifr, sintosa(&sin)); 1164 if ((ifp->if_ioctl == NULL) || 1165 (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(void *)&ifr) != 0) { 1166 LIST_REMOVE(inm, inm_list); 1167 pool_put(&inmulti_pool, inm); 1168 splx(s); 1169 return (NULL); 1170 } 1171 /* 1172 * Let IGMP know that we have joined a new IP multicast group. 1173 */ 1174 if (igmp_joingroup(inm) != 0) { 1175 LIST_REMOVE(inm, inm_list); 1176 pool_put(&inmulti_pool, inm); 1177 splx(s); 1178 return (NULL); 1179 } 1180 in_multientries++; 1181 } 1182 splx(s); 1183 return (inm); 1184 } 1185 1186 /* 1187 * Delete a multicast address record. 1188 */ 1189 void 1190 in_delmulti(struct in_multi *inm) 1191 { 1192 struct sockaddr_in sin; 1193 struct ifreq ifr; 1194 int s = splsoftnet(); 1195 1196 if (--inm->inm_refcount == 0) { 1197 /* 1198 * No remaining claims to this record; let IGMP know that 1199 * we are leaving the multicast group. 1200 */ 1201 igmp_leavegroup(inm); 1202 /* 1203 * Unlink from list. 1204 */ 1205 LIST_REMOVE(inm, inm_list); 1206 in_multientries--; 1207 /* 1208 * Notify the network driver to update its multicast reception 1209 * filter. 1210 */ 1211 sockaddr_in_init(&sin, &inm->inm_addr, 0); 1212 ifreq_setaddr(SIOCDELMULTI, &ifr, sintosa(&sin)); 1213 (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI, 1214 (void *)&ifr); 1215 pool_put(&inmulti_pool, inm); 1216 } 1217 splx(s); 1218 } 1219 #endif /* INET */ 1220