in.c revision 1.121
1 /* $NetBSD: in.c,v 1.121 2007/12/05 23:47:18 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 1.121 2007/12/05 23:47:18 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 < 8; y++) { 292 if ((p[x] & (0x80 >> y)) == 0) 293 break; 294 } 295 } 296 return x * 8 + 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 / 8; i++) 308 p[i] = 0xff; 309 if (len % 8) 310 p[i] = (0xff00 >> (len % 8)) & 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 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, 412 ifa_list); 413 IFAREF(&ia->ia_ifa); 414 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 415 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 416 ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask); 417 #ifdef IPSELSRC 418 ia->ia_ifa.ifa_getifa = in_getifa; 419 #else /* IPSELSRC */ 420 ia->ia_ifa.ifa_getifa = NULL; 421 #endif /* IPSELSRC */ 422 ia->ia_sockmask.sin_len = 8; 423 if (ifp->if_flags & IFF_BROADCAST) { 424 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 425 ia->ia_broadaddr.sin_family = AF_INET; 426 } 427 ia->ia_ifp = ifp; 428 LIST_INIT(&ia->ia_multiaddrs); 429 newifaddr = 1; 430 } 431 break; 432 433 case SIOCSIFBRDADDR: 434 if (l == NULL) 435 return (EPERM); 436 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 437 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 438 NULL) != 0) 439 return (EPERM); 440 /* FALLTHROUGH */ 441 442 case SIOCGIFADDR: 443 case SIOCGIFNETMASK: 444 case SIOCGIFDSTADDR: 445 case SIOCGIFBRDADDR: 446 if (ia == 0) 447 return (EADDRNOTAVAIL); 448 break; 449 } 450 error = 0; 451 switch (cmd) { 452 453 case SIOCGIFADDR: 454 ifreq_setaddr(cmd, ifr, sintocsa(&ia->ia_addr)); 455 break; 456 457 case SIOCGIFBRDADDR: 458 if ((ifp->if_flags & IFF_BROADCAST) == 0) 459 return (EINVAL); 460 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_broadaddr)); 461 break; 462 463 case SIOCGIFDSTADDR: 464 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 465 return (EINVAL); 466 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_dstaddr)); 467 break; 468 469 case SIOCGIFNETMASK: 470 ifreq_setaddr(cmd, ifr, sintocsa(&ia->ia_sockmask)); 471 break; 472 473 case SIOCSIFDSTADDR: 474 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 475 return (EINVAL); 476 oldaddr = ia->ia_dstaddr; 477 ia->ia_dstaddr = *satocsin(ifreq_getdstaddr(cmd, ifr)); 478 if (ifp->if_ioctl != NULL && 479 (error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 480 (void *)ia)) != 0) { 481 ia->ia_dstaddr = oldaddr; 482 return error; 483 } 484 if (ia->ia_flags & IFA_ROUTE) { 485 ia->ia_ifa.ifa_dstaddr = sintosa(&oldaddr); 486 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 487 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 488 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST|RTF_UP); 489 } 490 break; 491 492 case SIOCSIFBRDADDR: 493 if ((ifp->if_flags & IFF_BROADCAST) == 0) 494 return EINVAL; 495 ia->ia_broadaddr = *satocsin(ifreq_getbroadaddr(cmd, ifr)); 496 break; 497 498 case SIOCSIFADDR: 499 error = in_ifinit(ifp, ia, satocsin(ifreq_getaddr(cmd, ifr)), 500 1); 501 #ifdef PFIL_HOOKS 502 if (error == 0) 503 (void)pfil_run_hooks(&if_pfil, 504 (struct mbuf **)SIOCSIFADDR, ifp, PFIL_IFADDR); 505 #endif 506 break; 507 508 case SIOCSIFNETMASK: 509 in_ifscrub(ifp, ia); 510 ia->ia_sockmask = *satocsin(ifreq_getaddr(cmd, ifr)); 511 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 512 error = in_ifinit(ifp, ia, NULL, 0); 513 break; 514 515 case SIOCAIFADDR: 516 maskIsNew = 0; 517 hostIsNew = 1; 518 if (ia->ia_addr.sin_family != AF_INET) 519 ; 520 else if (ifra->ifra_addr.sin_len == 0) { 521 ifra->ifra_addr = ia->ia_addr; 522 hostIsNew = 0; 523 } else if (in_hosteq(ia->ia_addr.sin_addr, 524 ifra->ifra_addr.sin_addr)) 525 hostIsNew = 0; 526 if (ifra->ifra_mask.sin_len) { 527 in_ifscrub(ifp, ia); 528 ia->ia_sockmask = ifra->ifra_mask; 529 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 530 maskIsNew = 1; 531 } 532 if ((ifp->if_flags & IFF_POINTOPOINT) && 533 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 534 in_ifscrub(ifp, ia); 535 ia->ia_dstaddr = ifra->ifra_dstaddr; 536 maskIsNew = 1; /* We lie; but the effect's the same */ 537 } 538 if (ifra->ifra_addr.sin_family == AF_INET && 539 (hostIsNew || maskIsNew)) { 540 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 541 } 542 if ((ifp->if_flags & IFF_BROADCAST) && 543 (ifra->ifra_broadaddr.sin_family == AF_INET)) 544 ia->ia_broadaddr = ifra->ifra_broadaddr; 545 #ifdef PFIL_HOOKS 546 if (error == 0) 547 (void)pfil_run_hooks(&if_pfil, 548 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 549 #endif 550 break; 551 552 case SIOCGIFALIAS: 553 ifra->ifra_mask = ia->ia_sockmask; 554 if ((ifp->if_flags & IFF_POINTOPOINT) && 555 (ia->ia_dstaddr.sin_family == AF_INET)) 556 ifra->ifra_dstaddr = ia->ia_dstaddr; 557 else if ((ifp->if_flags & IFF_BROADCAST) && 558 (ia->ia_broadaddr.sin_family == AF_INET)) 559 ifra->ifra_broadaddr = ia->ia_broadaddr; 560 else 561 memset(&ifra->ifra_broadaddr, 0, 562 sizeof(ifra->ifra_broadaddr)); 563 break; 564 565 case SIOCDIFADDR: 566 in_purgeaddr(&ia->ia_ifa); 567 #ifdef PFIL_HOOKS 568 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR, 569 ifp, PFIL_IFADDR); 570 #endif 571 break; 572 573 #ifdef MROUTING 574 case SIOCGETVIFCNT: 575 case SIOCGETSGCNT: 576 error = mrt_ioctl(so, cmd, data); 577 break; 578 #endif /* MROUTING */ 579 580 default: 581 if (ifp == NULL || ifp->if_ioctl == NULL) 582 return EOPNOTSUPP; 583 error = (*ifp->if_ioctl)(ifp, cmd, data); 584 in_setmaxmtu(); 585 break; 586 } 587 588 if (error != 0 && newifaddr) { 589 KASSERT(ia != NULL); 590 in_purgeaddr(&ia->ia_ifa); 591 } 592 593 return error; 594 } 595 596 void 597 in_purgeaddr(struct ifaddr *ifa) 598 { 599 struct ifnet *ifp = ifa->ifa_ifp; 600 struct in_ifaddr *ia = (void *) ifa; 601 602 in_ifscrub(ifp, ia); 603 LIST_REMOVE(ia, ia_hash); 604 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 605 IFAFREE(&ia->ia_ifa); 606 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_list); 607 if (ia->ia_allhosts != NULL) 608 in_delmulti(ia->ia_allhosts); 609 IFAFREE(&ia->ia_ifa); 610 in_setmaxmtu(); 611 } 612 613 void 614 in_purgeif(struct ifnet *ifp) /* MUST be called at splsoftnet() */ 615 { 616 if_purgeaddrs(ifp, AF_INET, in_purgeaddr); 617 igmp_purgeif(ifp); /* manipulates pools */ 618 #ifdef MROUTING 619 ip_mrouter_detach(ifp); 620 #endif 621 } 622 623 /* 624 * SIOC[GAD]LIFADDR. 625 * SIOCGLIFADDR: get first address. (???) 626 * SIOCGLIFADDR with IFLR_PREFIX: 627 * get first address that matches the specified prefix. 628 * SIOCALIFADDR: add the specified address. 629 * SIOCALIFADDR with IFLR_PREFIX: 630 * EINVAL since we can't deduce hostid part of the address. 631 * SIOCDLIFADDR: delete the specified address. 632 * SIOCDLIFADDR with IFLR_PREFIX: 633 * delete the first address that matches the specified prefix. 634 * return values: 635 * EINVAL on invalid parameters 636 * EADDRNOTAVAIL on prefix match failed/specified address not found 637 * other values may be returned from in_ioctl() 638 */ 639 static int 640 in_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 641 struct ifnet *ifp, struct lwp *l) 642 { 643 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 644 struct ifaddr *ifa; 645 struct sockaddr *sa; 646 647 /* sanity checks */ 648 if (data == NULL || ifp == NULL) { 649 panic("invalid argument to in_lifaddr_ioctl"); 650 /*NOTRECHED*/ 651 } 652 653 switch (cmd) { 654 case SIOCGLIFADDR: 655 /* address must be specified on GET with IFLR_PREFIX */ 656 if ((iflr->flags & IFLR_PREFIX) == 0) 657 break; 658 /*FALLTHROUGH*/ 659 case SIOCALIFADDR: 660 case SIOCDLIFADDR: 661 /* address must be specified on ADD and DELETE */ 662 sa = (struct sockaddr *)&iflr->addr; 663 if (sa->sa_family != AF_INET) 664 return EINVAL; 665 if (sa->sa_len != sizeof(struct sockaddr_in)) 666 return EINVAL; 667 /* XXX need improvement */ 668 sa = (struct sockaddr *)&iflr->dstaddr; 669 if (sa->sa_family 670 && sa->sa_family != AF_INET) 671 return EINVAL; 672 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in)) 673 return EINVAL; 674 break; 675 default: /*shouldn't happen*/ 676 #if 0 677 panic("invalid cmd to in_lifaddr_ioctl"); 678 /*NOTREACHED*/ 679 #else 680 return EOPNOTSUPP; 681 #endif 682 } 683 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 684 return EINVAL; 685 686 switch (cmd) { 687 case SIOCALIFADDR: 688 { 689 struct in_aliasreq ifra; 690 691 if (iflr->flags & IFLR_PREFIX) 692 return EINVAL; 693 694 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ 695 bzero(&ifra, sizeof(ifra)); 696 bcopy(iflr->iflr_name, ifra.ifra_name, 697 sizeof(ifra.ifra_name)); 698 699 bcopy(&iflr->addr, &ifra.ifra_addr, 700 ((struct sockaddr *)&iflr->addr)->sa_len); 701 702 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 703 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 704 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 705 } 706 707 ifra.ifra_mask.sin_family = AF_INET; 708 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 709 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 710 711 return in_control(so, SIOCAIFADDR, (void *)&ifra, ifp, l); 712 } 713 case SIOCGLIFADDR: 714 case SIOCDLIFADDR: 715 { 716 struct in_ifaddr *ia; 717 struct in_addr mask, candidate, match; 718 struct sockaddr_in *sin; 719 int cmp; 720 721 bzero(&mask, sizeof(mask)); 722 bzero(&match, sizeof(match)); /* XXX gcc */ 723 if (iflr->flags & IFLR_PREFIX) { 724 /* lookup a prefix rather than address. */ 725 in_len2mask(&mask, iflr->prefixlen); 726 727 sin = (struct sockaddr_in *)&iflr->addr; 728 match.s_addr = sin->sin_addr.s_addr; 729 match.s_addr &= mask.s_addr; 730 731 /* if you set extra bits, that's wrong */ 732 if (match.s_addr != sin->sin_addr.s_addr) 733 return EINVAL; 734 735 cmp = 1; 736 } else { 737 if (cmd == SIOCGLIFADDR) { 738 /* on getting an address, take the 1st match */ 739 cmp = 0; /*XXX*/ 740 } else { 741 /* on deleting an address, do exact match */ 742 in_len2mask(&mask, 32); 743 sin = (struct sockaddr_in *)&iflr->addr; 744 match.s_addr = sin->sin_addr.s_addr; 745 746 cmp = 1; 747 } 748 } 749 750 IFADDR_FOREACH(ifa, ifp) { 751 if (ifa->ifa_addr->sa_family != AF_INET) 752 continue; 753 if (cmp == 0) 754 break; 755 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 756 candidate.s_addr &= mask.s_addr; 757 if (candidate.s_addr == match.s_addr) 758 break; 759 } 760 if (ifa == NULL) 761 return EADDRNOTAVAIL; 762 ia = (struct in_ifaddr *)ifa; 763 764 if (cmd == SIOCGLIFADDR) { 765 /* fill in the if_laddrreq structure */ 766 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 767 768 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 769 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 770 ia->ia_dstaddr.sin_len); 771 } else 772 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 773 774 iflr->prefixlen = 775 in_mask2len(&ia->ia_sockmask.sin_addr); 776 777 iflr->flags = 0; /*XXX*/ 778 779 return 0; 780 } else { 781 struct in_aliasreq ifra; 782 783 /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ 784 bzero(&ifra, sizeof(ifra)); 785 bcopy(iflr->iflr_name, ifra.ifra_name, 786 sizeof(ifra.ifra_name)); 787 788 bcopy(&ia->ia_addr, &ifra.ifra_addr, 789 ia->ia_addr.sin_len); 790 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 791 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 792 ia->ia_dstaddr.sin_len); 793 } 794 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 795 ia->ia_sockmask.sin_len); 796 797 return in_control(so, SIOCDIFADDR, (void *)&ifra, 798 ifp, l); 799 } 800 } 801 } 802 803 return EOPNOTSUPP; /*just for safety*/ 804 } 805 806 static int 807 in_ifaddrpref_ioctl(struct socket *so, u_long cmd, void *data, 808 struct ifnet *ifp) 809 { 810 struct if_addrprefreq *ifap = (struct if_addrprefreq *)data; 811 struct ifaddr *ifa; 812 struct sockaddr *sa; 813 struct in_ifaddr *ia = NULL; /* appease gcc -Wuninitialized */ 814 struct in_addr match; 815 struct sockaddr_in *sin; 816 817 /* sanity checks */ 818 if (data == NULL || ifp == NULL) { 819 panic("invalid argument to %s", __func__); 820 /*NOTREACHED*/ 821 } 822 823 /* address must be specified on ADD and DELETE */ 824 sa = (struct sockaddr *)&ifap->ifap_addr; 825 if (sa->sa_family != AF_INET) 826 return EINVAL; 827 if (sa->sa_len != sizeof(struct sockaddr_in)) 828 return EINVAL; 829 830 switch (cmd) { 831 case SIOCSIFADDRPREF: 832 case SIOCGIFADDRPREF: 833 break; 834 default: 835 return EOPNOTSUPP; 836 } 837 838 sin = (struct sockaddr_in *)&ifap->ifap_addr; 839 match.s_addr = sin->sin_addr.s_addr; 840 841 IFADDR_FOREACH(ifa, ifp) { 842 ia = (struct in_ifaddr *)ifa; 843 if (ia->ia_addr.sin_family != AF_INET) 844 continue; 845 if (ia->ia_addr.sin_addr.s_addr == match.s_addr) 846 break; 847 } 848 if (ifa == NULL) 849 return EADDRNOTAVAIL; 850 851 switch (cmd) { 852 case SIOCSIFADDRPREF: 853 ifa->ifa_preference = ifap->ifap_preference; 854 return 0; 855 case SIOCGIFADDRPREF: 856 /* fill in the if_laddrreq structure */ 857 (void)memcpy(&ifap->ifap_addr, &ia->ia_addr, 858 ia->ia_addr.sin_len); 859 ifap->ifap_preference = ifa->ifa_preference; 860 return 0; 861 default: 862 return EOPNOTSUPP; 863 } 864 } 865 866 /* 867 * Delete any existing route for an interface. 868 */ 869 void 870 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 871 { 872 873 in_scrubprefix(ia); 874 } 875 876 /* 877 * Initialize an interface's internet address 878 * and routing table entry. 879 */ 880 int 881 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 882 const struct sockaddr_in *sin, int scrub) 883 { 884 u_int32_t i; 885 struct sockaddr_in oldaddr; 886 int s = splnet(), flags = RTF_UP, error; 887 888 if (sin == NULL) 889 sin = &ia->ia_addr; 890 891 /* 892 * Set up new addresses. 893 */ 894 oldaddr = ia->ia_addr; 895 if (ia->ia_addr.sin_family == AF_INET) 896 LIST_REMOVE(ia, ia_hash); 897 ia->ia_addr = *sin; 898 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 899 900 /* 901 * Give the interface a chance to initialize 902 * if this is its first address, 903 * and to validate the address if necessary. 904 */ 905 if (ifp->if_ioctl && 906 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (void *)ia))) 907 goto bad; 908 splx(s); 909 if (scrub) { 910 ia->ia_ifa.ifa_addr = sintosa(&oldaddr); 911 in_ifscrub(ifp, ia); 912 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 913 } 914 915 i = ia->ia_addr.sin_addr.s_addr; 916 if (IN_CLASSA(i)) 917 ia->ia_netmask = IN_CLASSA_NET; 918 else if (IN_CLASSB(i)) 919 ia->ia_netmask = IN_CLASSB_NET; 920 else 921 ia->ia_netmask = IN_CLASSC_NET; 922 /* 923 * The subnet mask usually includes at least the standard network part, 924 * but may may be smaller in the case of supernetting. 925 * If it is set, we believe it. 926 */ 927 if (ia->ia_subnetmask == 0) { 928 ia->ia_subnetmask = ia->ia_netmask; 929 ia->ia_sockmask.sin_addr.s_addr = ia->ia_subnetmask; 930 } else 931 ia->ia_netmask &= ia->ia_subnetmask; 932 933 ia->ia_net = i & ia->ia_netmask; 934 ia->ia_subnet = i & ia->ia_subnetmask; 935 in_socktrim(&ia->ia_sockmask); 936 /* re-calculate the "in_maxmtu" value */ 937 in_setmaxmtu(); 938 /* 939 * Add route for the network. 940 */ 941 ia->ia_ifa.ifa_metric = ifp->if_metric; 942 if (ifp->if_flags & IFF_BROADCAST) { 943 ia->ia_broadaddr.sin_addr.s_addr = 944 ia->ia_subnet | ~ia->ia_subnetmask; 945 ia->ia_netbroadcast.s_addr = 946 ia->ia_net | ~ia->ia_netmask; 947 } else if (ifp->if_flags & IFF_LOOPBACK) { 948 ia->ia_dstaddr = ia->ia_addr; 949 flags |= RTF_HOST; 950 } else if (ifp->if_flags & IFF_POINTOPOINT) { 951 if (ia->ia_dstaddr.sin_family != AF_INET) 952 return (0); 953 flags |= RTF_HOST; 954 } 955 error = in_addprefix(ia, flags); 956 /* 957 * If the interface supports multicast, join the "all hosts" 958 * multicast group on that interface. 959 */ 960 if ((ifp->if_flags & IFF_MULTICAST) != 0 && ia->ia_allhosts == NULL) { 961 struct in_addr addr; 962 963 addr.s_addr = INADDR_ALLHOSTS_GROUP; 964 ia->ia_allhosts = in_addmulti(&addr, ifp); 965 } 966 return (error); 967 bad: 968 splx(s); 969 LIST_REMOVE(ia, ia_hash); 970 ia->ia_addr = oldaddr; 971 if (ia->ia_addr.sin_family == AF_INET) 972 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), 973 ia, ia_hash); 974 return (error); 975 } 976 977 #define rtinitflags(x) \ 978 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 979 ? RTF_HOST : 0) 980 981 /* 982 * add a route to prefix ("connected route" in cisco terminology). 983 * does nothing if there's some interface address with the same prefix already. 984 */ 985 static int 986 in_addprefix(struct in_ifaddr *target, int flags) 987 { 988 struct in_ifaddr *ia; 989 struct in_addr prefix, mask, p; 990 int error; 991 992 if ((flags & RTF_HOST) != 0) 993 prefix = target->ia_dstaddr.sin_addr; 994 else { 995 prefix = target->ia_addr.sin_addr; 996 mask = target->ia_sockmask.sin_addr; 997 prefix.s_addr &= mask.s_addr; 998 } 999 1000 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 1001 if (rtinitflags(ia)) 1002 p = ia->ia_dstaddr.sin_addr; 1003 else { 1004 p = ia->ia_addr.sin_addr; 1005 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1006 } 1007 1008 if (prefix.s_addr != p.s_addr) 1009 continue; 1010 1011 /* 1012 * if we got a matching prefix route inserted by other 1013 * interface address, we don't need to bother 1014 * 1015 * XXX RADIX_MPATH implications here? -dyoung 1016 */ 1017 if (ia->ia_flags & IFA_ROUTE) 1018 return 0; 1019 } 1020 1021 /* 1022 * noone seem to have prefix route. insert it. 1023 */ 1024 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1025 if (error == 0) 1026 target->ia_flags |= IFA_ROUTE; 1027 return error; 1028 } 1029 1030 /* 1031 * remove a route to prefix ("connected route" in cisco terminology). 1032 * re-installs the route by using another interface address, if there's one 1033 * with the same prefix (otherwise we lose the route mistakenly). 1034 */ 1035 static int 1036 in_scrubprefix(struct in_ifaddr *target) 1037 { 1038 struct in_ifaddr *ia; 1039 struct in_addr prefix, mask, p; 1040 int error; 1041 1042 if ((target->ia_flags & IFA_ROUTE) == 0) 1043 return 0; 1044 1045 if (rtinitflags(target)) 1046 prefix = target->ia_dstaddr.sin_addr; 1047 else { 1048 prefix = target->ia_addr.sin_addr; 1049 mask = target->ia_sockmask.sin_addr; 1050 prefix.s_addr &= mask.s_addr; 1051 } 1052 1053 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 1054 if (rtinitflags(ia)) 1055 p = ia->ia_dstaddr.sin_addr; 1056 else { 1057 p = ia->ia_addr.sin_addr; 1058 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1059 } 1060 1061 if (prefix.s_addr != p.s_addr) 1062 continue; 1063 1064 /* 1065 * if we got a matching prefix route, move IFA_ROUTE to him 1066 */ 1067 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1068 rtinit(&target->ia_ifa, RTM_DELETE, 1069 rtinitflags(target)); 1070 target->ia_flags &= ~IFA_ROUTE; 1071 1072 error = rtinit(&ia->ia_ifa, RTM_ADD, 1073 rtinitflags(ia) | RTF_UP); 1074 if (error == 0) 1075 ia->ia_flags |= IFA_ROUTE; 1076 return error; 1077 } 1078 } 1079 1080 /* 1081 * noone seem to have prefix route. remove it. 1082 */ 1083 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1084 target->ia_flags &= ~IFA_ROUTE; 1085 return 0; 1086 } 1087 1088 #undef rtinitflags 1089 1090 /* 1091 * Return 1 if the address might be a local broadcast address. 1092 */ 1093 int 1094 in_broadcast(struct in_addr in, struct ifnet *ifp) 1095 { 1096 struct ifaddr *ifa; 1097 1098 if (in.s_addr == INADDR_BROADCAST || 1099 in_nullhost(in)) 1100 return 1; 1101 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1102 return 0; 1103 /* 1104 * Look through the list of addresses for a match 1105 * with a broadcast address. 1106 */ 1107 #define ia (ifatoia(ifa)) 1108 IFADDR_FOREACH(ifa, ifp) 1109 if (ifa->ifa_addr->sa_family == AF_INET && 1110 !in_hosteq(in, ia->ia_addr.sin_addr) && 1111 (in_hosteq(in, ia->ia_broadaddr.sin_addr) || 1112 in_hosteq(in, ia->ia_netbroadcast) || 1113 (hostzeroisbroadcast && 1114 /* 1115 * Check for old-style (host 0) broadcast. 1116 */ 1117 (in.s_addr == ia->ia_subnet || 1118 in.s_addr == ia->ia_net)))) 1119 return 1; 1120 return (0); 1121 #undef ia 1122 } 1123 1124 /* 1125 * Add an address to the list of IP multicast addresses for a given interface. 1126 */ 1127 struct in_multi * 1128 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1129 { 1130 struct sockaddr_in sin; 1131 struct in_multi *inm; 1132 struct ifreq ifr; 1133 int s = splsoftnet(); 1134 1135 /* 1136 * See if address already in list. 1137 */ 1138 IN_LOOKUP_MULTI(*ap, ifp, inm); 1139 if (inm != NULL) { 1140 /* 1141 * Found it; just increment the reference count. 1142 */ 1143 ++inm->inm_refcount; 1144 } else { 1145 /* 1146 * New address; allocate a new multicast record 1147 * and link it into the interface's multicast list. 1148 */ 1149 inm = pool_get(&inmulti_pool, PR_NOWAIT); 1150 if (inm == NULL) { 1151 splx(s); 1152 return (NULL); 1153 } 1154 inm->inm_addr = *ap; 1155 inm->inm_ifp = ifp; 1156 inm->inm_refcount = 1; 1157 LIST_INSERT_HEAD( 1158 &IN_MULTI_HASH(inm->inm_addr.s_addr, ifp), 1159 inm, inm_list); 1160 /* 1161 * Ask the network driver to update its multicast reception 1162 * filter appropriately for the new address. 1163 */ 1164 sockaddr_in_init(&sin, ap, 0); 1165 ifreq_setaddr(SIOCADDMULTI, &ifr, sintosa(&sin)); 1166 if ((ifp->if_ioctl == NULL) || 1167 (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(void *)&ifr) != 0) { 1168 LIST_REMOVE(inm, inm_list); 1169 pool_put(&inmulti_pool, inm); 1170 splx(s); 1171 return (NULL); 1172 } 1173 /* 1174 * Let IGMP know that we have joined a new IP multicast group. 1175 */ 1176 if (igmp_joingroup(inm) != 0) { 1177 LIST_REMOVE(inm, inm_list); 1178 pool_put(&inmulti_pool, inm); 1179 splx(s); 1180 return (NULL); 1181 } 1182 in_multientries++; 1183 } 1184 splx(s); 1185 return (inm); 1186 } 1187 1188 /* 1189 * Delete a multicast address record. 1190 */ 1191 void 1192 in_delmulti(struct in_multi *inm) 1193 { 1194 struct sockaddr_in sin; 1195 struct ifreq ifr; 1196 int s = splsoftnet(); 1197 1198 if (--inm->inm_refcount == 0) { 1199 /* 1200 * No remaining claims to this record; let IGMP know that 1201 * we are leaving the multicast group. 1202 */ 1203 igmp_leavegroup(inm); 1204 /* 1205 * Unlink from list. 1206 */ 1207 LIST_REMOVE(inm, inm_list); 1208 in_multientries--; 1209 /* 1210 * Notify the network driver to update its multicast reception 1211 * filter. 1212 */ 1213 sockaddr_in_init(&sin, &inm->inm_addr, 0); 1214 ifreq_setaddr(SIOCDELMULTI, &ifr, sintosa(&sin)); 1215 (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI, 1216 (void *)&ifr); 1217 pool_put(&inmulti_pool, inm); 1218 } 1219 splx(s); 1220 } 1221 #endif /* INET */ 1222
Indexes created Thu Sep 25 08:09:54 GMT 2025