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sys/netinet/in.c
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1 /* $NetBSD: in.c,v 1.115 2006/11/16 01:33:45 christos 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 1.115 2006/11/16 01:33:45 christos 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, caddr_t, 148 struct ifnet *, struct lwp *); 149 150 static int in_ifaddrpref_ioctl(struct socket *, u_long, caddr_t, 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, caddr_t 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) 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) 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 == 0) 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((caddr_t)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 *satosin(&ifr->ifr_addr) = ia->ia_addr; 455 break; 456 457 case SIOCGIFBRDADDR: 458 if ((ifp->if_flags & IFF_BROADCAST) == 0) 459 return (EINVAL); 460 *satosin(&ifr->ifr_dstaddr) = ia->ia_broadaddr; 461 break; 462 463 case SIOCGIFDSTADDR: 464 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 465 return (EINVAL); 466 *satosin(&ifr->ifr_dstaddr) = ia->ia_dstaddr; 467 break; 468 469 case SIOCGIFNETMASK: 470 *satosin(&ifr->ifr_addr) = 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 = *satosin(&ifr->ifr_dstaddr); 478 if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 479 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 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), (int)RTM_DELETE, RTF_HOST); 486 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 487 rtinit(&(ia->ia_ifa), (int)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 = *satosin(&ifr->ifr_broadaddr); 495 break; 496 497 case SIOCSIFADDR: 498 error = in_ifinit(ifp, ia, satosin(&ifr->ifr_addr), 1); 499 #ifdef PFIL_HOOKS 500 if (!error) 501 (void)pfil_run_hooks(&if_pfil, 502 (struct mbuf **)SIOCSIFADDR, ifp, PFIL_IFADDR); 503 #endif 504 break; 505 506 case SIOCSIFNETMASK: 507 in_ifscrub(ifp, ia); 508 ia->ia_sockmask = *satosin(&ifr->ifr_addr); 509 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 510 error = in_ifinit(ifp, ia, NULL, 0); 511 break; 512 513 case SIOCAIFADDR: 514 maskIsNew = 0; 515 hostIsNew = 1; 516 if (ia->ia_addr.sin_family == AF_INET) { 517 if (ifra->ifra_addr.sin_len == 0) { 518 ifra->ifra_addr = ia->ia_addr; 519 hostIsNew = 0; 520 } else if (in_hosteq(ia->ia_addr.sin_addr, ifra->ifra_addr.sin_addr)) 521 hostIsNew = 0; 522 } 523 if (ifra->ifra_mask.sin_len) { 524 in_ifscrub(ifp, ia); 525 ia->ia_sockmask = ifra->ifra_mask; 526 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 527 maskIsNew = 1; 528 } 529 if ((ifp->if_flags & IFF_POINTOPOINT) && 530 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 531 in_ifscrub(ifp, ia); 532 ia->ia_dstaddr = ifra->ifra_dstaddr; 533 maskIsNew = 1; /* We lie; but the effect's the same */ 534 } 535 if (ifra->ifra_addr.sin_family == AF_INET && 536 (hostIsNew || maskIsNew)) { 537 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 538 } 539 if ((ifp->if_flags & IFF_BROADCAST) && 540 (ifra->ifra_broadaddr.sin_family == AF_INET)) 541 ia->ia_broadaddr = ifra->ifra_broadaddr; 542 #ifdef PFIL_HOOKS 543 if (!error) 544 (void)pfil_run_hooks(&if_pfil, 545 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 546 #endif 547 break; 548 549 case SIOCGIFALIAS: 550 ifra->ifra_mask = ia->ia_sockmask; 551 if ((ifp->if_flags & IFF_POINTOPOINT) && 552 (ia->ia_dstaddr.sin_family == AF_INET)) 553 ifra->ifra_dstaddr = ia->ia_dstaddr; 554 else if ((ifp->if_flags & IFF_BROADCAST) && 555 (ia->ia_broadaddr.sin_family == AF_INET)) 556 ifra->ifra_broadaddr = ia->ia_broadaddr; 557 else 558 bzero(&ifra->ifra_broadaddr, 559 sizeof(ifra->ifra_broadaddr)); 560 break; 561 562 case SIOCDIFADDR: 563 in_purgeaddr(&ia->ia_ifa, ifp); 564 #ifdef PFIL_HOOKS 565 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR, 566 ifp, PFIL_IFADDR); 567 #endif 568 break; 569 570 #ifdef MROUTING 571 case SIOCGETVIFCNT: 572 case SIOCGETSGCNT: 573 error = mrt_ioctl(so, cmd, data); 574 break; 575 #endif /* MROUTING */ 576 577 default: 578 if (ifp == 0 || ifp->if_ioctl == 0) 579 return (EOPNOTSUPP); 580 error = (*ifp->if_ioctl)(ifp, cmd, data); 581 in_setmaxmtu(); 582 break; 583 } 584 585 if (error && newifaddr) { 586 KASSERT(ia != NULL); 587 in_purgeaddr(&ia->ia_ifa, ifp); 588 } 589 590 return error; 591 } 592 593 void 594 in_purgeaddr(struct ifaddr *ifa, struct ifnet *ifp) 595 { 596 struct in_ifaddr *ia = (void *) ifa; 597 598 in_ifscrub(ifp, ia); 599 LIST_REMOVE(ia, ia_hash); 600 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 601 IFAFREE(&ia->ia_ifa); 602 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_list); 603 if (ia->ia_allhosts != NULL) 604 in_delmulti(ia->ia_allhosts); 605 IFAFREE(&ia->ia_ifa); 606 in_setmaxmtu(); 607 } 608 609 void 610 in_purgeif(struct ifnet *ifp) /* MUST be called at splsoftnet() */ 611 { 612 struct ifaddr *ifa, *nifa; 613 614 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) { 615 nifa = TAILQ_NEXT(ifa, ifa_list); 616 if (ifa->ifa_addr->sa_family != AF_INET) 617 continue; 618 in_purgeaddr(ifa, ifp); 619 } 620 621 igmp_purgeif(ifp); /* manipulates pools */ 622 #ifdef MROUTING 623 ip_mrouter_detach(ifp); 624 #endif 625 } 626 627 /* 628 * SIOC[GAD]LIFADDR. 629 * SIOCGLIFADDR: get first address. (???) 630 * SIOCGLIFADDR with IFLR_PREFIX: 631 * get first address that matches the specified prefix. 632 * SIOCALIFADDR: add the specified address. 633 * SIOCALIFADDR with IFLR_PREFIX: 634 * EINVAL since we can't deduce hostid part of the address. 635 * SIOCDLIFADDR: delete the specified address. 636 * SIOCDLIFADDR with IFLR_PREFIX: 637 * delete the first address that matches the specified prefix. 638 * return values: 639 * EINVAL on invalid parameters 640 * EADDRNOTAVAIL on prefix match failed/specified address not found 641 * other values may be returned from in_ioctl() 642 */ 643 static int 644 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 645 struct ifnet *ifp, struct lwp *l) 646 { 647 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 648 struct ifaddr *ifa; 649 struct sockaddr *sa; 650 651 /* sanity checks */ 652 if (!data || !ifp) { 653 panic("invalid argument to in_lifaddr_ioctl"); 654 /*NOTRECHED*/ 655 } 656 657 switch (cmd) { 658 case SIOCGLIFADDR: 659 /* address must be specified on GET with IFLR_PREFIX */ 660 if ((iflr->flags & IFLR_PREFIX) == 0) 661 break; 662 /*FALLTHROUGH*/ 663 case SIOCALIFADDR: 664 case SIOCDLIFADDR: 665 /* address must be specified on ADD and DELETE */ 666 sa = (struct sockaddr *)&iflr->addr; 667 if (sa->sa_family != AF_INET) 668 return EINVAL; 669 if (sa->sa_len != sizeof(struct sockaddr_in)) 670 return EINVAL; 671 /* XXX need improvement */ 672 sa = (struct sockaddr *)&iflr->dstaddr; 673 if (sa->sa_family 674 && sa->sa_family != AF_INET) 675 return EINVAL; 676 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in)) 677 return EINVAL; 678 break; 679 default: /*shouldn't happen*/ 680 #if 0 681 panic("invalid cmd to in_lifaddr_ioctl"); 682 /*NOTREACHED*/ 683 #else 684 return EOPNOTSUPP; 685 #endif 686 } 687 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 688 return EINVAL; 689 690 switch (cmd) { 691 case SIOCALIFADDR: 692 { 693 struct in_aliasreq ifra; 694 695 if (iflr->flags & IFLR_PREFIX) 696 return EINVAL; 697 698 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ 699 bzero(&ifra, sizeof(ifra)); 700 bcopy(iflr->iflr_name, ifra.ifra_name, 701 sizeof(ifra.ifra_name)); 702 703 bcopy(&iflr->addr, &ifra.ifra_addr, 704 ((struct sockaddr *)&iflr->addr)->sa_len); 705 706 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 707 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 708 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 709 } 710 711 ifra.ifra_mask.sin_family = AF_INET; 712 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 713 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 714 715 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, l); 716 } 717 case SIOCGLIFADDR: 718 case SIOCDLIFADDR: 719 { 720 struct in_ifaddr *ia; 721 struct in_addr mask, candidate, match; 722 struct sockaddr_in *sin; 723 int cmp; 724 725 bzero(&mask, sizeof(mask)); 726 bzero(&match, sizeof(match)); /* XXX gcc */ 727 if (iflr->flags & IFLR_PREFIX) { 728 /* lookup a prefix rather than address. */ 729 in_len2mask(&mask, iflr->prefixlen); 730 731 sin = (struct sockaddr_in *)&iflr->addr; 732 match.s_addr = sin->sin_addr.s_addr; 733 match.s_addr &= mask.s_addr; 734 735 /* if you set extra bits, that's wrong */ 736 if (match.s_addr != sin->sin_addr.s_addr) 737 return EINVAL; 738 739 cmp = 1; 740 } else { 741 if (cmd == SIOCGLIFADDR) { 742 /* on getting an address, take the 1st match */ 743 cmp = 0; /*XXX*/ 744 } else { 745 /* on deleting an address, do exact match */ 746 in_len2mask(&mask, 32); 747 sin = (struct sockaddr_in *)&iflr->addr; 748 match.s_addr = sin->sin_addr.s_addr; 749 750 cmp = 1; 751 } 752 } 753 754 IFADDR_FOREACH(ifa, ifp) { 755 if (ifa->ifa_addr->sa_family != AF_INET) 756 continue; 757 if (!cmp) 758 break; 759 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 760 candidate.s_addr &= mask.s_addr; 761 if (candidate.s_addr == match.s_addr) 762 break; 763 } 764 if (!ifa) 765 return EADDRNOTAVAIL; 766 ia = (struct in_ifaddr *)ifa; 767 768 if (cmd == SIOCGLIFADDR) { 769 /* fill in the if_laddrreq structure */ 770 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 771 772 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 773 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 774 ia->ia_dstaddr.sin_len); 775 } else 776 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 777 778 iflr->prefixlen = 779 in_mask2len(&ia->ia_sockmask.sin_addr); 780 781 iflr->flags = 0; /*XXX*/ 782 783 return 0; 784 } else { 785 struct in_aliasreq ifra; 786 787 /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ 788 bzero(&ifra, sizeof(ifra)); 789 bcopy(iflr->iflr_name, ifra.ifra_name, 790 sizeof(ifra.ifra_name)); 791 792 bcopy(&ia->ia_addr, &ifra.ifra_addr, 793 ia->ia_addr.sin_len); 794 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 795 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 796 ia->ia_dstaddr.sin_len); 797 } 798 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 799 ia->ia_sockmask.sin_len); 800 801 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 802 ifp, l); 803 } 804 } 805 } 806 807 return EOPNOTSUPP; /*just for safety*/ 808 } 809 810 static int 811 in_ifaddrpref_ioctl(struct socket *so, u_long cmd, caddr_t data, 812 struct ifnet *ifp) 813 { 814 struct if_addrprefreq *ifap = (struct if_addrprefreq *)data; 815 struct ifaddr *ifa; 816 struct sockaddr *sa; 817 struct in_ifaddr *ia = NULL; /* appease gcc -Wuninitialized */ 818 struct in_addr match; 819 struct sockaddr_in *sin; 820 821 /* sanity checks */ 822 if (data == NULL || ifp == NULL) { 823 panic("invalid argument to %s", __func__); 824 /*NOTREACHED*/ 825 } 826 827 /* address must be specified on ADD and DELETE */ 828 sa = (struct sockaddr *)&ifap->ifap_addr; 829 if (sa->sa_family != AF_INET) 830 return EINVAL; 831 if (sa->sa_len != sizeof(struct sockaddr_in)) 832 return EINVAL; 833 834 switch (cmd) { 835 case SIOCSIFADDRPREF: 836 case SIOCGIFADDRPREF: 837 break; 838 default: 839 return EOPNOTSUPP; 840 } 841 842 sin = (struct sockaddr_in *)&ifap->ifap_addr; 843 match.s_addr = sin->sin_addr.s_addr; 844 845 IFADDR_FOREACH(ifa, ifp) { 846 ia = (struct in_ifaddr *)ifa; 847 if (ia->ia_addr.sin_family != AF_INET) 848 continue; 849 if (ia->ia_addr.sin_addr.s_addr == match.s_addr) 850 break; 851 } 852 if (ifa == NULL) 853 return EADDRNOTAVAIL; 854 855 switch (cmd) { 856 case SIOCSIFADDRPREF: 857 ifa->ifa_preference = ifap->ifap_preference; 858 return 0; 859 case SIOCGIFADDRPREF: 860 /* fill in the if_laddrreq structure */ 861 (void)memcpy(&ifap->ifap_addr, &ia->ia_addr, 862 ia->ia_addr.sin_len); 863 ifap->ifap_preference = ifa->ifa_preference; 864 return 0; 865 default: 866 return EOPNOTSUPP; 867 } 868 } 869 870 /* 871 * Delete any existing route for an interface. 872 */ 873 void 874 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 875 { 876 877 in_scrubprefix(ia); 878 } 879 880 /* 881 * Initialize an interface's internet address 882 * and routing table entry. 883 */ 884 int 885 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 886 struct sockaddr_in *sin, int scrub) 887 { 888 u_int32_t i; 889 struct sockaddr_in oldaddr; 890 int s = splnet(), flags = RTF_UP, error; 891 892 if (!sin) 893 sin = &ia->ia_addr; 894 895 /* 896 * Set up new addresses. 897 */ 898 oldaddr = ia->ia_addr; 899 if (ia->ia_addr.sin_family == AF_INET) 900 LIST_REMOVE(ia, ia_hash); 901 ia->ia_addr = *sin; 902 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 903 904 /* 905 * Give the interface a chance to initialize 906 * if this is its first address, 907 * and to validate the address if necessary. 908 */ 909 if (ifp->if_ioctl && 910 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) 911 goto bad; 912 splx(s); 913 if (scrub) { 914 ia->ia_ifa.ifa_addr = sintosa(&oldaddr); 915 in_ifscrub(ifp, ia); 916 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 917 } 918 919 i = ia->ia_addr.sin_addr.s_addr; 920 if (IN_CLASSA(i)) 921 ia->ia_netmask = IN_CLASSA_NET; 922 else if (IN_CLASSB(i)) 923 ia->ia_netmask = IN_CLASSB_NET; 924 else 925 ia->ia_netmask = IN_CLASSC_NET; 926 /* 927 * The subnet mask usually includes at least the standard network part, 928 * but may may be smaller in the case of supernetting. 929 * If it is set, we believe it. 930 */ 931 if (ia->ia_subnetmask == 0) { 932 ia->ia_subnetmask = ia->ia_netmask; 933 ia->ia_sockmask.sin_addr.s_addr = ia->ia_subnetmask; 934 } else 935 ia->ia_netmask &= ia->ia_subnetmask; 936 937 ia->ia_net = i & ia->ia_netmask; 938 ia->ia_subnet = i & ia->ia_subnetmask; 939 in_socktrim(&ia->ia_sockmask); 940 /* re-calculate the "in_maxmtu" value */ 941 in_setmaxmtu(); 942 /* 943 * Add route for the network. 944 */ 945 ia->ia_ifa.ifa_metric = ifp->if_metric; 946 if (ifp->if_flags & IFF_BROADCAST) { 947 ia->ia_broadaddr.sin_addr.s_addr = 948 ia->ia_subnet | ~ia->ia_subnetmask; 949 ia->ia_netbroadcast.s_addr = 950 ia->ia_net | ~ia->ia_netmask; 951 } else if (ifp->if_flags & IFF_LOOPBACK) { 952 ia->ia_dstaddr = ia->ia_addr; 953 flags |= RTF_HOST; 954 } else if (ifp->if_flags & IFF_POINTOPOINT) { 955 if (ia->ia_dstaddr.sin_family != AF_INET) 956 return (0); 957 flags |= RTF_HOST; 958 } 959 error = in_addprefix(ia, flags); 960 /* 961 * If the interface supports multicast, join the "all hosts" 962 * multicast group on that interface. 963 */ 964 if ((ifp->if_flags & IFF_MULTICAST) != 0 && ia->ia_allhosts == NULL) { 965 struct in_addr addr; 966 967 addr.s_addr = INADDR_ALLHOSTS_GROUP; 968 ia->ia_allhosts = in_addmulti(&addr, ifp); 969 } 970 return (error); 971 bad: 972 splx(s); 973 LIST_REMOVE(ia, ia_hash); 974 ia->ia_addr = oldaddr; 975 if (ia->ia_addr.sin_family == AF_INET) 976 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), 977 ia, ia_hash); 978 return (error); 979 } 980 981 #define rtinitflags(x) \ 982 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 983 ? RTF_HOST : 0) 984 985 /* 986 * add a route to prefix ("connected route" in cisco terminology). 987 * does nothing if there's some interface address with the same prefix already. 988 */ 989 static int 990 in_addprefix(struct in_ifaddr *target, int flags) 991 { 992 struct in_ifaddr *ia; 993 struct in_addr prefix, mask, p; 994 int error; 995 996 if ((flags & RTF_HOST) != 0) 997 prefix = target->ia_dstaddr.sin_addr; 998 else { 999 prefix = target->ia_addr.sin_addr; 1000 mask = target->ia_sockmask.sin_addr; 1001 prefix.s_addr &= mask.s_addr; 1002 } 1003 1004 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 1005 if (rtinitflags(ia)) 1006 p = ia->ia_dstaddr.sin_addr; 1007 else { 1008 p = ia->ia_addr.sin_addr; 1009 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1010 } 1011 1012 if (prefix.s_addr != p.s_addr) 1013 continue; 1014 1015 /* 1016 * if we got a matching prefix route inserted by other 1017 * interface address, we don't need to bother 1018 * 1019 * XXX RADIX_MPATH implications here? -dyoung 1020 */ 1021 if (ia->ia_flags & IFA_ROUTE) 1022 return 0; 1023 } 1024 1025 /* 1026 * noone seem to have prefix route. insert it. 1027 */ 1028 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1029 if (!error) 1030 target->ia_flags |= IFA_ROUTE; 1031 return error; 1032 } 1033 1034 /* 1035 * remove a route to prefix ("connected route" in cisco terminology). 1036 * re-installs the route by using another interface address, if there's one 1037 * with the same prefix (otherwise we lose the route mistakenly). 1038 */ 1039 static int 1040 in_scrubprefix(struct in_ifaddr *target) 1041 { 1042 struct in_ifaddr *ia; 1043 struct in_addr prefix, mask, p; 1044 int error; 1045 1046 if ((target->ia_flags & IFA_ROUTE) == 0) 1047 return 0; 1048 1049 if (rtinitflags(target)) 1050 prefix = target->ia_dstaddr.sin_addr; 1051 else { 1052 prefix = target->ia_addr.sin_addr; 1053 mask = target->ia_sockmask.sin_addr; 1054 prefix.s_addr &= mask.s_addr; 1055 } 1056 1057 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 1058 if (rtinitflags(ia)) 1059 p = ia->ia_dstaddr.sin_addr; 1060 else { 1061 p = ia->ia_addr.sin_addr; 1062 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1063 } 1064 1065 if (prefix.s_addr != p.s_addr) 1066 continue; 1067 1068 /* 1069 * if we got a matching prefix route, move IFA_ROUTE to him 1070 */ 1071 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1072 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1073 rtinitflags(target)); 1074 target->ia_flags &= ~IFA_ROUTE; 1075 1076 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1077 rtinitflags(ia) | RTF_UP); 1078 if (error == 0) 1079 ia->ia_flags |= IFA_ROUTE; 1080 return error; 1081 } 1082 } 1083 1084 /* 1085 * noone seem to have prefix route. remove it. 1086 */ 1087 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1088 target->ia_flags &= ~IFA_ROUTE; 1089 return 0; 1090 } 1091 1092 #undef rtinitflags 1093 1094 /* 1095 * Return 1 if the address might be a local broadcast address. 1096 */ 1097 int 1098 in_broadcast(struct in_addr in, struct ifnet *ifp) 1099 { 1100 struct ifaddr *ifa; 1101 1102 if (in.s_addr == INADDR_BROADCAST || 1103 in_nullhost(in)) 1104 return 1; 1105 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1106 return 0; 1107 /* 1108 * Look through the list of addresses for a match 1109 * with a broadcast address. 1110 */ 1111 #define ia (ifatoia(ifa)) 1112 IFADDR_FOREACH(ifa, ifp) 1113 if (ifa->ifa_addr->sa_family == AF_INET && 1114 !in_hosteq(in, ia->ia_addr.sin_addr) && 1115 (in_hosteq(in, ia->ia_broadaddr.sin_addr) || 1116 in_hosteq(in, ia->ia_netbroadcast) || 1117 (hostzeroisbroadcast && 1118 /* 1119 * Check for old-style (host 0) broadcast. 1120 */ 1121 (in.s_addr == ia->ia_subnet || 1122 in.s_addr == ia->ia_net)))) 1123 return 1; 1124 return (0); 1125 #undef ia 1126 } 1127 1128 /* 1129 * Add an address to the list of IP multicast addresses for a given interface. 1130 */ 1131 struct in_multi * 1132 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1133 { 1134 struct in_multi *inm; 1135 struct ifreq ifr; 1136 int s = splsoftnet(); 1137 1138 /* 1139 * See if address already in list. 1140 */ 1141 IN_LOOKUP_MULTI(*ap, ifp, inm); 1142 if (inm != NULL) { 1143 /* 1144 * Found it; just increment the reference count. 1145 */ 1146 ++inm->inm_refcount; 1147 } else { 1148 /* 1149 * New address; allocate a new multicast record 1150 * and link it into the interface's multicast list. 1151 */ 1152 inm = pool_get(&inmulti_pool, PR_NOWAIT); 1153 if (inm == NULL) { 1154 splx(s); 1155 return (NULL); 1156 } 1157 inm->inm_addr = *ap; 1158 inm->inm_ifp = ifp; 1159 inm->inm_refcount = 1; 1160 LIST_INSERT_HEAD( 1161 &IN_MULTI_HASH(inm->inm_addr.s_addr, ifp), 1162 inm, inm_list); 1163 /* 1164 * Ask the network driver to update its multicast reception 1165 * filter appropriately for the new address. 1166 */ 1167 satosin(&ifr.ifr_addr)->sin_len = sizeof(struct sockaddr_in); 1168 satosin(&ifr.ifr_addr)->sin_family = AF_INET; 1169 satosin(&ifr.ifr_addr)->sin_addr = *ap; 1170 if ((ifp->if_ioctl == NULL) || 1171 (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) { 1172 LIST_REMOVE(inm, inm_list); 1173 pool_put(&inmulti_pool, inm); 1174 splx(s); 1175 return (NULL); 1176 } 1177 /* 1178 * Let IGMP know that we have joined a new IP multicast group. 1179 */ 1180 if (igmp_joingroup(inm) != 0) { 1181 LIST_REMOVE(inm, inm_list); 1182 pool_put(&inmulti_pool, inm); 1183 splx(s); 1184 return (NULL); 1185 } 1186 in_multientries++; 1187 } 1188 splx(s); 1189 return (inm); 1190 } 1191 1192 /* 1193 * Delete a multicast address record. 1194 */ 1195 void 1196 in_delmulti(struct in_multi *inm) 1197 { 1198 struct ifreq ifr; 1199 int s = splsoftnet(); 1200 1201 if (--inm->inm_refcount == 0) { 1202 /* 1203 * No remaining claims to this record; let IGMP know that 1204 * we are leaving the multicast group. 1205 */ 1206 igmp_leavegroup(inm); 1207 /* 1208 * Unlink from list. 1209 */ 1210 LIST_REMOVE(inm, inm_list); 1211 in_multientries--; 1212 /* 1213 * Notify the network driver to update its multicast reception 1214 * filter. 1215 */ 1216 satosin(&ifr.ifr_addr)->sin_family = AF_INET; 1217 satosin(&ifr.ifr_addr)->sin_addr = inm->inm_addr; 1218 (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI, 1219 (caddr_t)&ifr); 1220 pool_put(&inmulti_pool, inm); 1221 } 1222 splx(s); 1223 } 1224 #endif /* INET */
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