Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet/in.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $NetBSD: in.c,v 1.104.2.1 2006/04/02 18:06:01 riz 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 1.104.2.1 2006/04/02 18:06:01 riz 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/systm.h> 115 #include <sys/proc.h> 116 #include <sys/syslog.h> 117 118 #include <net/if.h> 119 #include <net/route.h> 120 121 #include <net/if_ether.h> 122 123 #include <netinet/in_systm.h> 124 #include <netinet/in.h> 125 #include <netinet/in_var.h> 126 #include <netinet/ip.h> 127 #include <netinet/ip_var.h> 128 #include <netinet/in_pcb.h> 129 #include <netinet/if_inarp.h> 130 #include <netinet/ip_mroute.h> 131 #include <netinet/igmp_var.h> 132 133 #ifdef PFIL_HOOKS 134 #include <net/pfil.h> 135 #endif 136 137 #ifdef INET 138 static u_int in_mask2len(struct in_addr *); 139 static void in_len2mask(struct in_addr *, u_int); 140 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 141 struct ifnet *, struct proc *); 142 143 static int in_addprefix(struct in_ifaddr *, int); 144 static int in_scrubprefix(struct in_ifaddr *); 145 146 #ifndef SUBNETSARELOCAL 147 #define SUBNETSARELOCAL 1 148 #endif 149 150 #ifndef HOSTZEROBROADCAST 151 #define HOSTZEROBROADCAST 1 152 #endif 153 154 int subnetsarelocal = SUBNETSARELOCAL; 155 int hostzeroisbroadcast = HOSTZEROBROADCAST; 156 157 /* 158 * This list is used to keep track of in_multi chains which belong to 159 * deleted interface addresses. We use in_ifaddr so that a chain head 160 * won't be deallocated until all multicast address record are deleted. 161 */ 162 static TAILQ_HEAD(, in_ifaddr) in_mk = TAILQ_HEAD_INITIALIZER(in_mk); 163 164 /* 165 * Return 1 if an internet address is for a ``local'' host 166 * (one to which we have a connection). If subnetsarelocal 167 * is true, this includes other subnets of the local net. 168 * Otherwise, it includes only the directly-connected (sub)nets. 169 */ 170 int 171 in_localaddr(struct in_addr in) 172 { 173 struct in_ifaddr *ia; 174 175 if (subnetsarelocal) { 176 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) 177 if ((in.s_addr & ia->ia_netmask) == ia->ia_net) 178 return (1); 179 } else { 180 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) 181 if ((in.s_addr & ia->ia_subnetmask) == ia->ia_subnet) 182 return (1); 183 } 184 return (0); 185 } 186 187 /* 188 * Determine whether an IP address is in a reserved set of addresses 189 * that may not be forwarded, or whether datagrams to that destination 190 * may be forwarded. 191 */ 192 int 193 in_canforward(struct in_addr in) 194 { 195 u_int32_t net; 196 197 if (IN_EXPERIMENTAL(in.s_addr) || IN_MULTICAST(in.s_addr)) 198 return (0); 199 if (IN_CLASSA(in.s_addr)) { 200 net = in.s_addr & IN_CLASSA_NET; 201 if (net == 0 || net == htonl(IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 202 return (0); 203 } 204 return (1); 205 } 206 207 /* 208 * Trim a mask in a sockaddr 209 */ 210 void 211 in_socktrim(struct sockaddr_in *ap) 212 { 213 char *cplim = (char *) &ap->sin_addr; 214 char *cp = (char *) (&ap->sin_addr + 1); 215 216 ap->sin_len = 0; 217 while (--cp >= cplim) 218 if (*cp) { 219 (ap)->sin_len = cp - (char *) (ap) + 1; 220 break; 221 } 222 } 223 224 /* 225 * Routine to take an Internet address and convert into a 226 * "dotted quad" representation for printing. 227 */ 228 const char * 229 in_fmtaddr(struct in_addr addr) 230 { 231 static char buf[sizeof("123.456.789.123")]; 232 233 addr.s_addr = ntohl(addr.s_addr); 234 235 snprintf(buf, sizeof(buf), "%d.%d.%d.%d", 236 (addr.s_addr >> 24) & 0xFF, 237 (addr.s_addr >> 16) & 0xFF, 238 (addr.s_addr >> 8) & 0xFF, 239 (addr.s_addr >> 0) & 0xFF); 240 return buf; 241 } 242 243 /* 244 * Maintain the "in_maxmtu" variable, which is the largest 245 * mtu for non-local interfaces with AF_INET addresses assigned 246 * to them that are up. 247 */ 248 unsigned long in_maxmtu; 249 250 void 251 in_setmaxmtu(void) 252 { 253 struct in_ifaddr *ia; 254 struct ifnet *ifp; 255 unsigned long maxmtu = 0; 256 257 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 258 if ((ifp = ia->ia_ifp) == 0) 259 continue; 260 if ((ifp->if_flags & (IFF_UP|IFF_LOOPBACK)) != IFF_UP) 261 continue; 262 if (ifp->if_mtu > maxmtu) 263 maxmtu = ifp->if_mtu; 264 } 265 if (maxmtu) 266 in_maxmtu = maxmtu; 267 } 268 269 static u_int 270 in_mask2len(struct in_addr *mask) 271 { 272 u_int x, y; 273 u_char *p; 274 275 p = (u_char *)mask; 276 for (x = 0; x < sizeof(*mask); x++) { 277 if (p[x] != 0xff) 278 break; 279 } 280 y = 0; 281 if (x < sizeof(*mask)) { 282 for (y = 0; y < 8; y++) { 283 if ((p[x] & (0x80 >> y)) == 0) 284 break; 285 } 286 } 287 return x * 8 + y; 288 } 289 290 static void 291 in_len2mask(struct in_addr *mask, u_int len) 292 { 293 u_int i; 294 u_char *p; 295 296 p = (u_char *)mask; 297 bzero(mask, sizeof(*mask)); 298 for (i = 0; i < len / 8; i++) 299 p[i] = 0xff; 300 if (len % 8) 301 p[i] = (0xff00 >> (len % 8)) & 0xff; 302 } 303 304 /* 305 * Generic internet control operations (ioctl's). 306 * Ifp is 0 if not an interface-specific ioctl. 307 */ 308 /* ARGSUSED */ 309 int 310 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 311 struct proc *p) 312 { 313 struct ifreq *ifr = (struct ifreq *)data; 314 struct in_ifaddr *ia = 0; 315 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 316 struct sockaddr_in oldaddr; 317 int error, hostIsNew, maskIsNew; 318 int newifaddr = 0; 319 320 switch (cmd) { 321 case SIOCALIFADDR: 322 case SIOCDLIFADDR: 323 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) 324 return (EPERM); 325 /*fall through*/ 326 case SIOCGLIFADDR: 327 if (!ifp) 328 return EINVAL; 329 return in_lifaddr_ioctl(so, cmd, data, ifp, p); 330 } 331 332 /* 333 * Find address for this interface, if it exists. 334 */ 335 if (ifp) 336 IFP_TO_IA(ifp, ia); 337 338 switch (cmd) { 339 340 case SIOCAIFADDR: 341 case SIOCDIFADDR: 342 case SIOCGIFALIAS: 343 if (ifra->ifra_addr.sin_family == AF_INET) 344 LIST_FOREACH(ia, 345 &IN_IFADDR_HASH(ifra->ifra_addr.sin_addr.s_addr), 346 ia_hash) { 347 if (ia->ia_ifp == ifp && 348 in_hosteq(ia->ia_addr.sin_addr, 349 ifra->ifra_addr.sin_addr)) 350 break; 351 } 352 if ((cmd == SIOCDIFADDR || cmd == SIOCGIFALIAS) && ia == NULL) 353 return (EADDRNOTAVAIL); 354 355 #if 1 /*def COMPAT_43*/ 356 if (cmd == SIOCDIFADDR && 357 ifra->ifra_addr.sin_family == AF_UNSPEC) { 358 ifra->ifra_addr.sin_family = AF_INET; 359 } 360 #endif 361 /* FALLTHROUGH */ 362 case SIOCSIFADDR: 363 case SIOCSIFDSTADDR: 364 if (ifra->ifra_addr.sin_family != AF_INET) 365 return (EAFNOSUPPORT); 366 /* FALLTHROUGH */ 367 case SIOCSIFNETMASK: 368 if (ifp == 0) 369 panic("in_control"); 370 371 if (cmd == SIOCGIFALIAS) 372 break; 373 374 if (ia == NULL && 375 (cmd == SIOCSIFNETMASK || cmd == SIOCSIFDSTADDR)) 376 return (EADDRNOTAVAIL); 377 378 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) 379 return (EPERM); 380 381 if (ia == 0) { 382 MALLOC(ia, struct in_ifaddr *, sizeof(*ia), 383 M_IFADDR, M_WAITOK); 384 if (ia == 0) 385 return (ENOBUFS); 386 bzero((caddr_t)ia, sizeof *ia); 387 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_list); 388 IFAREF(&ia->ia_ifa); 389 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, 390 ifa_list); 391 IFAREF(&ia->ia_ifa); 392 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 393 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 394 ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask); 395 ia->ia_sockmask.sin_len = 8; 396 if (ifp->if_flags & IFF_BROADCAST) { 397 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 398 ia->ia_broadaddr.sin_family = AF_INET; 399 } 400 ia->ia_ifp = ifp; 401 LIST_INIT(&ia->ia_multiaddrs); 402 newifaddr = 1; 403 } 404 break; 405 406 case SIOCSIFBRDADDR: 407 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) 408 return (EPERM); 409 /* FALLTHROUGH */ 410 411 case SIOCGIFADDR: 412 case SIOCGIFNETMASK: 413 case SIOCGIFDSTADDR: 414 case SIOCGIFBRDADDR: 415 if (ia == 0) 416 return (EADDRNOTAVAIL); 417 break; 418 } 419 error = 0; 420 switch (cmd) { 421 422 case SIOCGIFADDR: 423 *satosin(&ifr->ifr_addr) = ia->ia_addr; 424 break; 425 426 case SIOCGIFBRDADDR: 427 if ((ifp->if_flags & IFF_BROADCAST) == 0) 428 return (EINVAL); 429 *satosin(&ifr->ifr_dstaddr) = ia->ia_broadaddr; 430 break; 431 432 case SIOCGIFDSTADDR: 433 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 434 return (EINVAL); 435 *satosin(&ifr->ifr_dstaddr) = ia->ia_dstaddr; 436 break; 437 438 case SIOCGIFNETMASK: 439 *satosin(&ifr->ifr_addr) = ia->ia_sockmask; 440 break; 441 442 case SIOCSIFDSTADDR: 443 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 444 return (EINVAL); 445 oldaddr = ia->ia_dstaddr; 446 ia->ia_dstaddr = *satosin(&ifr->ifr_dstaddr); 447 if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 448 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 449 ia->ia_dstaddr = oldaddr; 450 return (error); 451 } 452 if (ia->ia_flags & IFA_ROUTE) { 453 ia->ia_ifa.ifa_dstaddr = sintosa(&oldaddr); 454 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 455 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 456 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 457 } 458 break; 459 460 case SIOCSIFBRDADDR: 461 if ((ifp->if_flags & IFF_BROADCAST) == 0) 462 return (EINVAL); 463 ia->ia_broadaddr = *satosin(&ifr->ifr_broadaddr); 464 break; 465 466 case SIOCSIFADDR: 467 error = in_ifinit(ifp, ia, satosin(&ifr->ifr_addr), 1); 468 #ifdef PFIL_HOOKS 469 if (!error) 470 (void)pfil_run_hooks(&if_pfil, 471 (struct mbuf **)SIOCSIFADDR, ifp, PFIL_IFADDR); 472 #endif 473 break; 474 475 case SIOCSIFNETMASK: 476 in_ifscrub(ifp, ia); 477 ia->ia_sockmask = *satosin(&ifr->ifr_addr); 478 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 479 error = in_ifinit(ifp, ia, NULL, 0); 480 break; 481 482 case SIOCAIFADDR: 483 maskIsNew = 0; 484 hostIsNew = 1; 485 if (ia->ia_addr.sin_family == AF_INET) { 486 if (ifra->ifra_addr.sin_len == 0) { 487 ifra->ifra_addr = ia->ia_addr; 488 hostIsNew = 0; 489 } else if (in_hosteq(ia->ia_addr.sin_addr, ifra->ifra_addr.sin_addr)) 490 hostIsNew = 0; 491 } 492 if (ifra->ifra_mask.sin_len) { 493 in_ifscrub(ifp, ia); 494 ia->ia_sockmask = ifra->ifra_mask; 495 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 496 maskIsNew = 1; 497 } 498 if ((ifp->if_flags & IFF_POINTOPOINT) && 499 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 500 in_ifscrub(ifp, ia); 501 ia->ia_dstaddr = ifra->ifra_dstaddr; 502 maskIsNew = 1; /* We lie; but the effect's the same */ 503 } 504 if (ifra->ifra_addr.sin_family == AF_INET && 505 (hostIsNew || maskIsNew)) { 506 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 507 } 508 if ((ifp->if_flags & IFF_BROADCAST) && 509 (ifra->ifra_broadaddr.sin_family == AF_INET)) 510 ia->ia_broadaddr = ifra->ifra_broadaddr; 511 #ifdef PFIL_HOOKS 512 if (!error) 513 (void)pfil_run_hooks(&if_pfil, 514 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 515 #endif 516 break; 517 518 case SIOCGIFALIAS: 519 ifra->ifra_mask = ia->ia_sockmask; 520 if ((ifp->if_flags & IFF_POINTOPOINT) && 521 (ia->ia_dstaddr.sin_family == AF_INET)) 522 ifra->ifra_dstaddr = ia->ia_dstaddr; 523 else if ((ifp->if_flags & IFF_BROADCAST) && 524 (ia->ia_broadaddr.sin_family == AF_INET)) 525 ifra->ifra_broadaddr = ia->ia_broadaddr; 526 else 527 bzero(&ifra->ifra_broadaddr, 528 sizeof(ifra->ifra_broadaddr)); 529 break; 530 531 case SIOCDIFADDR: 532 in_purgeaddr(&ia->ia_ifa, ifp); 533 #ifdef PFIL_HOOKS 534 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR, 535 ifp, PFIL_IFADDR); 536 #endif 537 break; 538 539 #ifdef MROUTING 540 case SIOCGETVIFCNT: 541 case SIOCGETSGCNT: 542 error = mrt_ioctl(so, cmd, data); 543 break; 544 #endif /* MROUTING */ 545 546 default: 547 if (ifp == 0 || ifp->if_ioctl == 0) 548 return (EOPNOTSUPP); 549 error = (*ifp->if_ioctl)(ifp, cmd, data); 550 in_setmaxmtu(); 551 break; 552 } 553 554 if (error && newifaddr) { 555 KASSERT(ia != NULL); 556 in_purgeaddr(&ia->ia_ifa, ifp); 557 } 558 559 return error; 560 } 561 562 void 563 in_purgeaddr(struct ifaddr *ifa, struct ifnet *ifp) 564 { 565 struct in_ifaddr *ia = (void *) ifa; 566 567 in_ifscrub(ifp, ia); 568 LIST_REMOVE(ia, ia_hash); 569 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 570 IFAFREE(&ia->ia_ifa); 571 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_list); 572 if (ia->ia_allhosts != NULL) 573 in_delmulti(ia->ia_allhosts); 574 IFAFREE(&ia->ia_ifa); 575 in_setmaxmtu(); 576 } 577 578 void 579 in_purgeif(struct ifnet *ifp) 580 { 581 struct ifaddr *ifa, *nifa; 582 583 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) { 584 nifa = TAILQ_NEXT(ifa, ifa_list); 585 if (ifa->ifa_addr->sa_family != AF_INET) 586 continue; 587 in_purgeaddr(ifa, ifp); 588 } 589 590 igmp_purgeif(ifp); 591 #ifdef MROUTING 592 ip_mrouter_detach(ifp); 593 #endif 594 } 595 596 /* 597 * SIOC[GAD]LIFADDR. 598 * SIOCGLIFADDR: get first address. (???) 599 * SIOCGLIFADDR with IFLR_PREFIX: 600 * get first address that matches the specified prefix. 601 * SIOCALIFADDR: add the specified address. 602 * SIOCALIFADDR with IFLR_PREFIX: 603 * EINVAL since we can't deduce hostid part of the address. 604 * SIOCDLIFADDR: delete the specified address. 605 * SIOCDLIFADDR with IFLR_PREFIX: 606 * delete the first address that matches the specified prefix. 607 * return values: 608 * EINVAL on invalid parameters 609 * EADDRNOTAVAIL on prefix match failed/specified address not found 610 * other values may be returned from in_ioctl() 611 */ 612 static int 613 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 614 struct ifnet *ifp, struct proc *p) 615 { 616 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 617 struct ifaddr *ifa; 618 struct sockaddr *sa; 619 620 /* sanity checks */ 621 if (!data || !ifp) { 622 panic("invalid argument to in_lifaddr_ioctl"); 623 /*NOTRECHED*/ 624 } 625 626 switch (cmd) { 627 case SIOCGLIFADDR: 628 /* address must be specified on GET with IFLR_PREFIX */ 629 if ((iflr->flags & IFLR_PREFIX) == 0) 630 break; 631 /*FALLTHROUGH*/ 632 case SIOCALIFADDR: 633 case SIOCDLIFADDR: 634 /* address must be specified on ADD and DELETE */ 635 sa = (struct sockaddr *)&iflr->addr; 636 if (sa->sa_family != AF_INET) 637 return EINVAL; 638 if (sa->sa_len != sizeof(struct sockaddr_in)) 639 return EINVAL; 640 /* XXX need improvement */ 641 sa = (struct sockaddr *)&iflr->dstaddr; 642 if (sa->sa_family 643 && sa->sa_family != AF_INET) 644 return EINVAL; 645 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in)) 646 return EINVAL; 647 break; 648 default: /*shouldn't happen*/ 649 #if 0 650 panic("invalid cmd to in_lifaddr_ioctl"); 651 /*NOTREACHED*/ 652 #else 653 return EOPNOTSUPP; 654 #endif 655 } 656 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 657 return EINVAL; 658 659 switch (cmd) { 660 case SIOCALIFADDR: 661 { 662 struct in_aliasreq ifra; 663 664 if (iflr->flags & IFLR_PREFIX) 665 return EINVAL; 666 667 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN). */ 668 bzero(&ifra, sizeof(ifra)); 669 bcopy(iflr->iflr_name, ifra.ifra_name, 670 sizeof(ifra.ifra_name)); 671 672 bcopy(&iflr->addr, &ifra.ifra_addr, 673 ((struct sockaddr *)&iflr->addr)->sa_len); 674 675 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 676 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 677 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 678 } 679 680 ifra.ifra_mask.sin_family = AF_INET; 681 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 682 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 683 684 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, p); 685 } 686 case SIOCGLIFADDR: 687 case SIOCDLIFADDR: 688 { 689 struct in_ifaddr *ia; 690 struct in_addr mask, candidate, match; 691 struct sockaddr_in *sin; 692 int cmp; 693 694 bzero(&mask, sizeof(mask)); 695 if (iflr->flags & IFLR_PREFIX) { 696 /* lookup a prefix rather than address. */ 697 in_len2mask(&mask, iflr->prefixlen); 698 699 sin = (struct sockaddr_in *)&iflr->addr; 700 match.s_addr = sin->sin_addr.s_addr; 701 match.s_addr &= mask.s_addr; 702 703 /* if you set extra bits, that's wrong */ 704 if (match.s_addr != sin->sin_addr.s_addr) 705 return EINVAL; 706 707 cmp = 1; 708 } else { 709 if (cmd == SIOCGLIFADDR) { 710 /* on getting an address, take the 1st match */ 711 cmp = 0; /*XXX*/ 712 } else { 713 /* on deleting an address, do exact match */ 714 in_len2mask(&mask, 32); 715 sin = (struct sockaddr_in *)&iflr->addr; 716 match.s_addr = sin->sin_addr.s_addr; 717 718 cmp = 1; 719 } 720 } 721 722 IFADDR_FOREACH(ifa, ifp) { 723 if (ifa->ifa_addr->sa_family != AF_INET) 724 continue; 725 if (!cmp) 726 break; 727 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 728 candidate.s_addr &= mask.s_addr; 729 if (candidate.s_addr == match.s_addr) 730 break; 731 } 732 if (!ifa) 733 return EADDRNOTAVAIL; 734 ia = (struct in_ifaddr *)ifa; 735 736 if (cmd == SIOCGLIFADDR) { 737 /* fill in the if_laddrreq structure */ 738 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 739 740 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 741 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 742 ia->ia_dstaddr.sin_len); 743 } else 744 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 745 746 iflr->prefixlen = 747 in_mask2len(&ia->ia_sockmask.sin_addr); 748 749 iflr->flags = 0; /*XXX*/ 750 751 return 0; 752 } else { 753 struct in_aliasreq ifra; 754 755 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN) */ 756 bzero(&ifra, sizeof(ifra)); 757 bcopy(iflr->iflr_name, ifra.ifra_name, 758 sizeof(ifra.ifra_name)); 759 760 bcopy(&ia->ia_addr, &ifra.ifra_addr, 761 ia->ia_addr.sin_len); 762 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 763 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 764 ia->ia_dstaddr.sin_len); 765 } 766 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 767 ia->ia_sockmask.sin_len); 768 769 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 770 ifp, p); 771 } 772 } 773 } 774 775 return EOPNOTSUPP; /*just for safety*/ 776 } 777 778 /* 779 * Delete any existing route for an interface. 780 */ 781 void 782 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 783 { 784 785 in_scrubprefix(ia); 786 } 787 788 /* 789 * Initialize an interface's internet address 790 * and routing table entry. 791 */ 792 int 793 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 794 struct sockaddr_in *sin, int scrub) 795 { 796 u_int32_t i; 797 struct sockaddr_in oldaddr; 798 int s = splnet(), flags = RTF_UP, error; 799 800 if (!sin) 801 sin = &ia->ia_addr; 802 803 /* 804 * Set up new addresses. 805 */ 806 oldaddr = ia->ia_addr; 807 if (ia->ia_addr.sin_family == AF_INET) 808 LIST_REMOVE(ia, ia_hash); 809 ia->ia_addr = *sin; 810 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 811 812 /* 813 * Give the interface a chance to initialize 814 * if this is its first address, 815 * and to validate the address if necessary. 816 */ 817 if (ifp->if_ioctl && 818 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) 819 goto bad; 820 splx(s); 821 if (scrub) { 822 ia->ia_ifa.ifa_addr = sintosa(&oldaddr); 823 in_ifscrub(ifp, ia); 824 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 825 } 826 827 i = ia->ia_addr.sin_addr.s_addr; 828 if (IN_CLASSA(i)) 829 ia->ia_netmask = IN_CLASSA_NET; 830 else if (IN_CLASSB(i)) 831 ia->ia_netmask = IN_CLASSB_NET; 832 else 833 ia->ia_netmask = IN_CLASSC_NET; 834 /* 835 * The subnet mask usually includes at least the standard network part, 836 * but may may be smaller in the case of supernetting. 837 * If it is set, we believe it. 838 */ 839 if (ia->ia_subnetmask == 0) { 840 ia->ia_subnetmask = ia->ia_netmask; 841 ia->ia_sockmask.sin_addr.s_addr = ia->ia_subnetmask; 842 } else 843 ia->ia_netmask &= ia->ia_subnetmask; 844 845 ia->ia_net = i & ia->ia_netmask; 846 ia->ia_subnet = i & ia->ia_subnetmask; 847 in_socktrim(&ia->ia_sockmask); 848 /* re-calculate the "in_maxmtu" value */ 849 in_setmaxmtu(); 850 /* 851 * Add route for the network. 852 */ 853 ia->ia_ifa.ifa_metric = ifp->if_metric; 854 if (ifp->if_flags & IFF_BROADCAST) { 855 ia->ia_broadaddr.sin_addr.s_addr = 856 ia->ia_subnet | ~ia->ia_subnetmask; 857 ia->ia_netbroadcast.s_addr = 858 ia->ia_net | ~ia->ia_netmask; 859 } else if (ifp->if_flags & IFF_LOOPBACK) { 860 ia->ia_dstaddr = ia->ia_addr; 861 flags |= RTF_HOST; 862 } else if (ifp->if_flags & IFF_POINTOPOINT) { 863 if (ia->ia_dstaddr.sin_family != AF_INET) 864 return (0); 865 flags |= RTF_HOST; 866 } 867 error = in_addprefix(ia, flags); 868 /* 869 * If the interface supports multicast, join the "all hosts" 870 * multicast group on that interface. 871 */ 872 if ((ifp->if_flags & IFF_MULTICAST) != 0 && ia->ia_allhosts == NULL) { 873 struct in_addr addr; 874 875 addr.s_addr = INADDR_ALLHOSTS_GROUP; 876 ia->ia_allhosts = in_addmulti(&addr, ifp); 877 } 878 return (error); 879 bad: 880 splx(s); 881 LIST_REMOVE(ia, ia_hash); 882 ia->ia_addr = oldaddr; 883 if (ia->ia_addr.sin_family == AF_INET) 884 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), 885 ia, ia_hash); 886 return (error); 887 } 888 889 #define rtinitflags(x) \ 890 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 891 ? RTF_HOST : 0) 892 893 /* 894 * add a route to prefix ("connected route" in cisco terminology). 895 * does nothing if there's some interface address with the same prefix already. 896 */ 897 static int 898 in_addprefix(struct in_ifaddr *target, int flags) 899 { 900 struct in_ifaddr *ia; 901 struct in_addr prefix, mask, p; 902 int error; 903 904 if ((flags & RTF_HOST) != 0) 905 prefix = target->ia_dstaddr.sin_addr; 906 else { 907 prefix = target->ia_addr.sin_addr; 908 mask = target->ia_sockmask.sin_addr; 909 prefix.s_addr &= mask.s_addr; 910 } 911 912 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 913 if (rtinitflags(ia)) 914 p = ia->ia_dstaddr.sin_addr; 915 else { 916 p = ia->ia_addr.sin_addr; 917 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 918 } 919 920 if (prefix.s_addr != p.s_addr) 921 continue; 922 923 /* 924 * if we got a matching prefix route inserted by other 925 * interface address, we don't need to bother 926 */ 927 if (ia->ia_flags & IFA_ROUTE) 928 return 0; 929 } 930 931 /* 932 * noone seem to have prefix route. insert it. 933 */ 934 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 935 if (!error) 936 target->ia_flags |= IFA_ROUTE; 937 return error; 938 } 939 940 /* 941 * remove a route to prefix ("connected route" in cisco terminology). 942 * re-installs the route by using another interface address, if there's one 943 * with the same prefix (otherwise we lose the route mistakenly). 944 */ 945 static int 946 in_scrubprefix(struct in_ifaddr *target) 947 { 948 struct in_ifaddr *ia; 949 struct in_addr prefix, mask, p; 950 int error; 951 952 if ((target->ia_flags & IFA_ROUTE) == 0) 953 return 0; 954 955 if (rtinitflags(target)) 956 prefix = target->ia_dstaddr.sin_addr; 957 else { 958 prefix = target->ia_addr.sin_addr; 959 mask = target->ia_sockmask.sin_addr; 960 prefix.s_addr &= mask.s_addr; 961 } 962 963 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 964 if (rtinitflags(ia)) 965 p = ia->ia_dstaddr.sin_addr; 966 else { 967 p = ia->ia_addr.sin_addr; 968 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 969 } 970 971 if (prefix.s_addr != p.s_addr) 972 continue; 973 974 /* 975 * if we got a matching prefix route, move IFA_ROUTE to him 976 */ 977 if ((ia->ia_flags & IFA_ROUTE) == 0) { 978 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 979 rtinitflags(target)); 980 target->ia_flags &= ~IFA_ROUTE; 981 982 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 983 rtinitflags(ia) | RTF_UP); 984 if (error == 0) 985 ia->ia_flags |= IFA_ROUTE; 986 return error; 987 } 988 } 989 990 /* 991 * noone seem to have prefix route. remove it. 992 */ 993 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 994 target->ia_flags &= ~IFA_ROUTE; 995 return 0; 996 } 997 998 #undef rtinitflags 999 1000 /* 1001 * Return 1 if the address might be a local broadcast address. 1002 */ 1003 int 1004 in_broadcast(struct in_addr in, struct ifnet *ifp) 1005 { 1006 struct ifaddr *ifa; 1007 1008 if (in.s_addr == INADDR_BROADCAST || 1009 in_nullhost(in)) 1010 return 1; 1011 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1012 return 0; 1013 /* 1014 * Look through the list of addresses for a match 1015 * with a broadcast address. 1016 */ 1017 #define ia (ifatoia(ifa)) 1018 IFADDR_FOREACH(ifa, ifp) 1019 if (ifa->ifa_addr->sa_family == AF_INET && 1020 !in_hosteq(in, ia->ia_addr.sin_addr) && 1021 (in_hosteq(in, ia->ia_broadaddr.sin_addr) || 1022 in_hosteq(in, ia->ia_netbroadcast) || 1023 (hostzeroisbroadcast && 1024 /* 1025 * Check for old-style (host 0) broadcast. 1026 */ 1027 (in.s_addr == ia->ia_subnet || 1028 in.s_addr == ia->ia_net)))) 1029 return 1; 1030 return (0); 1031 #undef ia 1032 } 1033 1034 /* 1035 * Add an address to the list of IP multicast addresses for a given interface. 1036 */ 1037 struct in_multi * 1038 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1039 { 1040 struct in_multi *inm; 1041 struct ifreq ifr; 1042 int s = splsoftnet(); 1043 1044 /* 1045 * See if address already in list. 1046 */ 1047 IN_LOOKUP_MULTI(*ap, ifp, inm); 1048 if (inm != NULL) { 1049 /* 1050 * Found it; just increment the reference count. 1051 */ 1052 ++inm->inm_refcount; 1053 } else { 1054 /* 1055 * New address; allocate a new multicast record 1056 * and link it into the interface's multicast list. 1057 */ 1058 inm = pool_get(&inmulti_pool, PR_NOWAIT); 1059 if (inm == NULL) { 1060 splx(s); 1061 return (NULL); 1062 } 1063 inm->inm_addr = *ap; 1064 inm->inm_ifp = ifp; 1065 inm->inm_refcount = 1; 1066 LIST_INSERT_HEAD( 1067 &IN_MULTI_HASH(inm->inm_addr.s_addr, ifp), 1068 inm, inm_list); 1069 /* 1070 * Ask the network driver to update its multicast reception 1071 * filter appropriately for the new address. 1072 */ 1073 satosin(&ifr.ifr_addr)->sin_len = sizeof(struct sockaddr_in); 1074 satosin(&ifr.ifr_addr)->sin_family = AF_INET; 1075 satosin(&ifr.ifr_addr)->sin_addr = *ap; 1076 if ((ifp->if_ioctl == NULL) || 1077 (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) { 1078 LIST_REMOVE(inm, inm_list); 1079 pool_put(&inmulti_pool, inm); 1080 splx(s); 1081 return (NULL); 1082 } 1083 /* 1084 * Let IGMP know that we have joined a new IP multicast group. 1085 */ 1086 if (igmp_joingroup(inm) != 0) { 1087 LIST_REMOVE(inm, inm_list); 1088 pool_put(&inmulti_pool, inm); 1089 splx(s); 1090 return (NULL); 1091 } 1092 in_multientries++; 1093 } 1094 splx(s); 1095 return (inm); 1096 } 1097 1098 /* 1099 * Delete a multicast address record. 1100 */ 1101 void 1102 in_delmulti(struct in_multi *inm) 1103 { 1104 struct ifreq ifr; 1105 int s = splsoftnet(); 1106 1107 if (--inm->inm_refcount == 0) { 1108 /* 1109 * No remaining claims to this record; let IGMP know that 1110 * we are leaving the multicast group. 1111 */ 1112 igmp_leavegroup(inm); 1113 /* 1114 * Unlink from list. 1115 */ 1116 LIST_REMOVE(inm, inm_list); 1117 in_multientries--; 1118 /* 1119 * Notify the network driver to update its multicast reception 1120 * filter. 1121 */ 1122 satosin(&ifr.ifr_addr)->sin_family = AF_INET; 1123 satosin(&ifr.ifr_addr)->sin_addr = inm->inm_addr; 1124 (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI, 1125 (caddr_t)&ifr); 1126 pool_put(&inmulti_pool, inm); 1127 } 1128 splx(s); 1129 } 1130 #endif
Cache object: 4bd53549639e3a694249fe98c9991401
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]