in.c revision 1.156
1 /* $NetBSD: in.c,v 1.156 2015/05/16 12:12:46 roy 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 * 49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 52 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 59 * POSSIBILITY OF SUCH DAMAGE. 60 */ 61 62 /* 63 * Copyright (c) 1982, 1986, 1991, 1993 64 * The Regents of the University of California. All rights reserved. 65 * 66 * Redistribution and use in source and binary forms, with or without 67 * modification, are permitted provided that the following conditions 68 * are met: 69 * 1. Redistributions of source code must retain the above copyright 70 * notice, this list of conditions and the following disclaimer. 71 * 2. Redistributions in binary form must reproduce the above copyright 72 * notice, this list of conditions and the following disclaimer in the 73 * documentation and/or other materials provided with the distribution. 74 * 3. Neither the name of the University nor the names of its contributors 75 * may be used to endorse or promote products derived from this software 76 * without specific prior written permission. 77 * 78 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 79 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 80 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 81 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 82 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 83 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 84 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 85 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 86 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 87 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 88 * SUCH DAMAGE. 89 * 90 * @(#)in.c 8.4 (Berkeley) 1/9/95 91 */ 92 93 #include <sys/cdefs.h> 94 __KERNEL_RCSID(0, "$NetBSD: in.c,v 1.156 2015/05/16 12:12:46 roy Exp $"); 95 96 #include "arp.h" 97 #include "opt_inet.h" 98 #include "opt_inet_conf.h" 99 #include "opt_mrouting.h" 100 101 #include <sys/param.h> 102 #include <sys/ioctl.h> 103 #include <sys/errno.h> 104 #include <sys/kernel.h> 105 #include <sys/malloc.h> 106 #include <sys/socket.h> 107 #include <sys/socketvar.h> 108 #include <sys/sysctl.h> 109 #include <sys/systm.h> 110 #include <sys/proc.h> 111 #include <sys/syslog.h> 112 #include <sys/kauth.h> 113 114 #include <sys/cprng.h> 115 116 #include <net/if.h> 117 #include <net/route.h> 118 #include <net/pfil.h> 119 120 #include <net/if_ether.h> 121 122 #include <netinet/in_systm.h> 123 #include <netinet/in.h> 124 #include <netinet/in_var.h> 125 #include <netinet/ip.h> 126 #include <netinet/ip_var.h> 127 #include <netinet/in_ifattach.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 IPSELSRC 134 #include <netinet/in_selsrc.h> 135 #endif 136 137 static u_int in_mask2len(struct in_addr *); 138 static void in_len2mask(struct in_addr *, u_int); 139 static int in_lifaddr_ioctl(struct socket *, u_long, void *, 140 struct ifnet *); 141 142 static int in_addprefix(struct in_ifaddr *, int); 143 static int in_scrubprefix(struct in_ifaddr *); 144 static void in_sysctl_init(struct sysctllog **); 145 146 #ifndef SUBNETSARELOCAL 147 #define SUBNETSARELOCAL 1 148 #endif 149 150 #ifndef HOSTZEROBROADCAST 151 #define HOSTZEROBROADCAST 1 152 #endif 153 154 /* Note: 61, 127, 251, 509, 1021, 2039 are good. */ 155 #ifndef IN_MULTI_HASH_SIZE 156 #define IN_MULTI_HASH_SIZE 509 157 #endif 158 159 static int subnetsarelocal = SUBNETSARELOCAL; 160 static int hostzeroisbroadcast = HOSTZEROBROADCAST; 161 162 /* 163 * This list is used to keep track of in_multi chains which belong to 164 * deleted interface addresses. We use in_ifaddr so that a chain head 165 * won't be deallocated until all multicast address record are deleted. 166 */ 167 168 LIST_HEAD(in_multihashhead, in_multi); /* Type of the hash head */ 169 170 static struct pool inmulti_pool; 171 static u_int in_multientries; 172 static struct in_multihashhead *in_multihashtbl; 173 static u_long in_multihash; 174 static krwlock_t in_multilock; 175 176 #define IN_MULTI_HASH(x, ifp) \ 177 (in_multihashtbl[(u_long)((x) ^ (ifp->if_index)) % IN_MULTI_HASH_SIZE]) 178 179 struct in_ifaddrhashhead * in_ifaddrhashtbl; 180 u_long in_ifaddrhash; 181 struct in_ifaddrhead in_ifaddrhead; 182 183 void 184 in_init(void) 185 { 186 pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", 187 NULL, IPL_SOFTNET); 188 TAILQ_INIT(&in_ifaddrhead); 189 190 in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 191 &in_ifaddrhash); 192 in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 193 &in_multihash); 194 rw_init(&in_multilock); 195 196 in_sysctl_init(NULL); 197 } 198 199 /* 200 * Return 1 if an internet address is for a ``local'' host 201 * (one to which we have a connection). If subnetsarelocal 202 * is true, this includes other subnets of the local net. 203 * Otherwise, it includes only the directly-connected (sub)nets. 204 */ 205 int 206 in_localaddr(struct in_addr in) 207 { 208 struct in_ifaddr *ia; 209 210 if (subnetsarelocal) { 211 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) 212 if ((in.s_addr & ia->ia_netmask) == ia->ia_net) 213 return (1); 214 } else { 215 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) 216 if ((in.s_addr & ia->ia_subnetmask) == ia->ia_subnet) 217 return (1); 218 } 219 return (0); 220 } 221 222 /* 223 * Determine whether an IP address is in a reserved set of addresses 224 * that may not be forwarded, or whether datagrams to that destination 225 * may be forwarded. 226 */ 227 int 228 in_canforward(struct in_addr in) 229 { 230 u_int32_t net; 231 232 if (IN_EXPERIMENTAL(in.s_addr) || IN_MULTICAST(in.s_addr)) 233 return (0); 234 if (IN_CLASSA(in.s_addr)) { 235 net = in.s_addr & IN_CLASSA_NET; 236 if (net == 0 || net == htonl(IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 237 return (0); 238 } 239 return (1); 240 } 241 242 /* 243 * Trim a mask in a sockaddr 244 */ 245 void 246 in_socktrim(struct sockaddr_in *ap) 247 { 248 char *cplim = (char *) &ap->sin_addr; 249 char *cp = (char *) (&ap->sin_addr + 1); 250 251 ap->sin_len = 0; 252 while (--cp >= cplim) 253 if (*cp) { 254 (ap)->sin_len = cp - (char *) (ap) + 1; 255 break; 256 } 257 } 258 259 /* 260 * Routine to take an Internet address and convert into a 261 * "dotted quad" representation for printing. 262 */ 263 const char * 264 in_fmtaddr(struct in_addr addr) 265 { 266 static char buf[sizeof("123.456.789.123")]; 267 268 addr.s_addr = ntohl(addr.s_addr); 269 270 snprintf(buf, sizeof(buf), "%d.%d.%d.%d", 271 (addr.s_addr >> 24) & 0xFF, 272 (addr.s_addr >> 16) & 0xFF, 273 (addr.s_addr >> 8) & 0xFF, 274 (addr.s_addr >> 0) & 0xFF); 275 return buf; 276 } 277 278 /* 279 * Maintain the "in_maxmtu" variable, which is the largest 280 * mtu for non-local interfaces with AF_INET addresses assigned 281 * to them that are up. 282 */ 283 unsigned long in_maxmtu; 284 285 void 286 in_setmaxmtu(void) 287 { 288 struct in_ifaddr *ia; 289 struct ifnet *ifp; 290 unsigned long maxmtu = 0; 291 292 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 293 if ((ifp = ia->ia_ifp) == 0) 294 continue; 295 if ((ifp->if_flags & (IFF_UP|IFF_LOOPBACK)) != IFF_UP) 296 continue; 297 if (ifp->if_mtu > maxmtu) 298 maxmtu = ifp->if_mtu; 299 } 300 if (maxmtu) 301 in_maxmtu = maxmtu; 302 } 303 304 static u_int 305 in_mask2len(struct in_addr *mask) 306 { 307 u_int x, y; 308 u_char *p; 309 310 p = (u_char *)mask; 311 for (x = 0; x < sizeof(*mask); x++) { 312 if (p[x] != 0xff) 313 break; 314 } 315 y = 0; 316 if (x < sizeof(*mask)) { 317 for (y = 0; y < NBBY; y++) { 318 if ((p[x] & (0x80 >> y)) == 0) 319 break; 320 } 321 } 322 return x * NBBY + y; 323 } 324 325 static void 326 in_len2mask(struct in_addr *mask, u_int len) 327 { 328 u_int i; 329 u_char *p; 330 331 p = (u_char *)mask; 332 memset(mask, 0, sizeof(*mask)); 333 for (i = 0; i < len / NBBY; i++) 334 p[i] = 0xff; 335 if (len % NBBY) 336 p[i] = (0xff00 >> (len % NBBY)) & 0xff; 337 } 338 339 /* 340 * Generic internet control operations (ioctl's). 341 * Ifp is 0 if not an interface-specific ioctl. 342 */ 343 /* ARGSUSED */ 344 int 345 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 346 { 347 struct ifreq *ifr = (struct ifreq *)data; 348 struct in_ifaddr *ia = NULL; 349 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 350 struct sockaddr_in oldaddr; 351 int error, hostIsNew, maskIsNew; 352 int newifaddr = 0; 353 354 switch (cmd) { 355 case SIOCALIFADDR: 356 case SIOCDLIFADDR: 357 case SIOCGLIFADDR: 358 if (ifp == NULL) 359 return EINVAL; 360 return in_lifaddr_ioctl(so, cmd, data, ifp); 361 case SIOCGIFADDRPREF: 362 case SIOCSIFADDRPREF: 363 if (ifp == NULL) 364 return EINVAL; 365 return ifaddrpref_ioctl(so, cmd, data, ifp); 366 } 367 368 /* 369 * Find address for this interface, if it exists. 370 */ 371 if (ifp != NULL) 372 IFP_TO_IA(ifp, ia); 373 374 hostIsNew = 1; /* moved here to appease gcc */ 375 switch (cmd) { 376 case SIOCAIFADDR: 377 case SIOCDIFADDR: 378 case SIOCGIFALIAS: 379 case SIOCGIFAFLAG_IN: 380 if (ifra->ifra_addr.sin_family == AF_INET) 381 LIST_FOREACH(ia, 382 &IN_IFADDR_HASH(ifra->ifra_addr.sin_addr.s_addr), 383 ia_hash) { 384 if (ia->ia_ifp == ifp && 385 in_hosteq(ia->ia_addr.sin_addr, 386 ifra->ifra_addr.sin_addr)) 387 break; 388 } 389 if ((cmd == SIOCDIFADDR || 390 cmd == SIOCGIFALIAS || 391 cmd == SIOCGIFAFLAG_IN) && 392 ia == NULL) 393 return (EADDRNOTAVAIL); 394 395 if (cmd == SIOCDIFADDR && 396 ifra->ifra_addr.sin_family == AF_UNSPEC) { 397 ifra->ifra_addr.sin_family = AF_INET; 398 } 399 /* FALLTHROUGH */ 400 case SIOCSIFADDR: 401 if (ia == NULL || ia->ia_addr.sin_family != AF_INET) 402 ; 403 else if (ifra->ifra_addr.sin_len == 0) { 404 ifra->ifra_addr = ia->ia_addr; 405 hostIsNew = 0; 406 } else if (in_hosteq(ia->ia_addr.sin_addr, 407 ifra->ifra_addr.sin_addr)) 408 hostIsNew = 0; 409 /* FALLTHROUGH */ 410 case SIOCSIFDSTADDR: 411 if (ifra->ifra_addr.sin_family != AF_INET) 412 return (EAFNOSUPPORT); 413 /* FALLTHROUGH */ 414 case SIOCSIFNETMASK: 415 if (ifp == NULL) 416 panic("in_control"); 417 418 if (cmd == SIOCGIFALIAS || cmd == SIOCGIFAFLAG_IN) 419 break; 420 421 if (ia == NULL && 422 (cmd == SIOCSIFNETMASK || cmd == SIOCSIFDSTADDR)) 423 return (EADDRNOTAVAIL); 424 425 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_INTERFACE, 426 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 427 NULL) != 0) 428 return (EPERM); 429 430 if (ia == NULL) { 431 ia = malloc(sizeof(*ia), M_IFADDR, M_WAITOK|M_ZERO); 432 if (ia == NULL) 433 return (ENOBUFS); 434 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_list); 435 ifaref(&ia->ia_ifa); 436 ifa_insert(ifp, &ia->ia_ifa); 437 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 438 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 439 ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask); 440 #ifdef IPSELSRC 441 ia->ia_ifa.ifa_getifa = in_getifa; 442 #else /* IPSELSRC */ 443 ia->ia_ifa.ifa_getifa = NULL; 444 #endif /* IPSELSRC */ 445 ia->ia_sockmask.sin_len = 8; 446 ia->ia_sockmask.sin_family = AF_INET; 447 if (ifp->if_flags & IFF_BROADCAST) { 448 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 449 ia->ia_broadaddr.sin_family = AF_INET; 450 } 451 ia->ia_ifp = ifp; 452 ia->ia_idsalt = cprng_fast32() % 65535; 453 LIST_INIT(&ia->ia_multiaddrs); 454 newifaddr = 1; 455 } 456 break; 457 458 case SIOCSIFBRDADDR: 459 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_INTERFACE, 460 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 461 NULL) != 0) 462 return (EPERM); 463 /* FALLTHROUGH */ 464 465 case SIOCGIFADDR: 466 case SIOCGIFNETMASK: 467 case SIOCGIFDSTADDR: 468 case SIOCGIFBRDADDR: 469 if (ia == NULL) 470 return (EADDRNOTAVAIL); 471 break; 472 } 473 error = 0; 474 switch (cmd) { 475 476 case SIOCGIFADDR: 477 ifreq_setaddr(cmd, ifr, sintocsa(&ia->ia_addr)); 478 break; 479 480 case SIOCGIFBRDADDR: 481 if ((ifp->if_flags & IFF_BROADCAST) == 0) 482 return (EINVAL); 483 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_broadaddr)); 484 break; 485 486 case SIOCGIFDSTADDR: 487 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 488 return (EINVAL); 489 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_dstaddr)); 490 break; 491 492 case SIOCGIFNETMASK: 493 /* 494 * We keep the number of trailing zero bytes the sin_len field 495 * of ia_sockmask, so we fix this before we pass it back to 496 * userland. 497 */ 498 oldaddr = ia->ia_sockmask; 499 oldaddr.sin_len = sizeof(struct sockaddr_in); 500 ifreq_setaddr(cmd, ifr, (const void *)&oldaddr); 501 break; 502 503 case SIOCSIFDSTADDR: 504 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 505 return (EINVAL); 506 oldaddr = ia->ia_dstaddr; 507 ia->ia_dstaddr = *satocsin(ifreq_getdstaddr(cmd, ifr)); 508 if ((error = if_addr_init(ifp, &ia->ia_ifa, false)) != 0) { 509 ia->ia_dstaddr = oldaddr; 510 return error; 511 } 512 if (ia->ia_flags & IFA_ROUTE) { 513 ia->ia_ifa.ifa_dstaddr = sintosa(&oldaddr); 514 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 515 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 516 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST|RTF_UP); 517 } 518 break; 519 520 case SIOCSIFBRDADDR: 521 if ((ifp->if_flags & IFF_BROADCAST) == 0) 522 return EINVAL; 523 ia->ia_broadaddr = *satocsin(ifreq_getbroadaddr(cmd, ifr)); 524 break; 525 526 case SIOCSIFADDR: 527 error = in_ifinit(ifp, ia, satocsin(ifreq_getaddr(cmd, ifr)), 528 1, hostIsNew); 529 if (error == 0) { 530 (void)pfil_run_hooks(if_pfil, 531 (struct mbuf **)SIOCSIFADDR, ifp, PFIL_IFADDR); 532 } 533 break; 534 535 case SIOCSIFNETMASK: 536 in_ifscrub(ifp, ia); 537 ia->ia_sockmask = *satocsin(ifreq_getaddr(cmd, ifr)); 538 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 539 error = in_ifinit(ifp, ia, NULL, 0, 0); 540 break; 541 542 case SIOCAIFADDR: 543 maskIsNew = 0; 544 if (ifra->ifra_mask.sin_len) { 545 /* Only scrub if we control the prefix route, 546 * otherwise userland gets a bogus message */ 547 if ((ia->ia_flags & IFA_ROUTE)) 548 in_ifscrub(ifp, ia); 549 ia->ia_sockmask = ifra->ifra_mask; 550 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 551 maskIsNew = 1; 552 } 553 if ((ifp->if_flags & IFF_POINTOPOINT) && 554 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 555 /* Only scrub if we control the prefix route, 556 * otherwise userland gets a bogus message */ 557 if ((ia->ia_flags & IFA_ROUTE)) 558 in_ifscrub(ifp, ia); 559 ia->ia_dstaddr = ifra->ifra_dstaddr; 560 maskIsNew = 1; /* We lie; but the effect's the same */ 561 } 562 if (ifra->ifra_addr.sin_family == AF_INET && 563 (hostIsNew || maskIsNew)) { 564 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0, 565 hostIsNew); 566 } 567 if ((ifp->if_flags & IFF_BROADCAST) && 568 (ifra->ifra_broadaddr.sin_family == AF_INET)) 569 ia->ia_broadaddr = ifra->ifra_broadaddr; 570 if (error == 0) 571 (void)pfil_run_hooks(if_pfil, 572 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 573 break; 574 575 case SIOCGIFALIAS: 576 ifra->ifra_mask = ia->ia_sockmask; 577 if ((ifp->if_flags & IFF_POINTOPOINT) && 578 (ia->ia_dstaddr.sin_family == AF_INET)) 579 ifra->ifra_dstaddr = ia->ia_dstaddr; 580 else if ((ifp->if_flags & IFF_BROADCAST) && 581 (ia->ia_broadaddr.sin_family == AF_INET)) 582 ifra->ifra_broadaddr = ia->ia_broadaddr; 583 else 584 memset(&ifra->ifra_broadaddr, 0, 585 sizeof(ifra->ifra_broadaddr)); 586 break; 587 588 case SIOCGIFAFLAG_IN: 589 ifr->ifr_addrflags = ia->ia4_flags; 590 break; 591 592 case SIOCDIFADDR: 593 in_purgeaddr(&ia->ia_ifa); 594 (void)pfil_run_hooks(if_pfil, (struct mbuf **)SIOCDIFADDR, 595 ifp, PFIL_IFADDR); 596 break; 597 598 #ifdef MROUTING 599 case SIOCGETVIFCNT: 600 case SIOCGETSGCNT: 601 error = mrt_ioctl(so, cmd, data); 602 break; 603 #endif /* MROUTING */ 604 605 default: 606 return ENOTTY; 607 } 608 609 if (error != 0 && newifaddr) { 610 KASSERT(ia != NULL); 611 in_purgeaddr(&ia->ia_ifa); 612 } 613 614 return error; 615 } 616 617 /* Add ownaddr as loopback rtentry. */ 618 static void 619 in_ifaddlocal(struct ifaddr *ifa) 620 { 621 struct in_ifaddr *ia; 622 623 ia = (struct in_ifaddr *)ifa; 624 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY || 625 (ia->ia_ifp->if_flags & IFF_POINTOPOINT && 626 in_hosteq(ia->ia_dstaddr.sin_addr, ia->ia_addr.sin_addr))) 627 { 628 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 629 return; 630 } 631 632 rt_ifa_addlocal(ifa); 633 } 634 635 /* Rempve loopback entry of ownaddr */ 636 static void 637 in_ifremlocal(struct ifaddr *ifa) 638 { 639 struct in_ifaddr *ia, *p; 640 struct ifaddr *alt_ifa = NULL; 641 int ia_count = 0; 642 643 ia = (struct in_ifaddr *)ifa; 644 /* Delete the entry if exactly one ifaddr matches the 645 * address, ifa->ifa_addr. */ 646 TAILQ_FOREACH(p, &in_ifaddrhead, ia_list) { 647 if (!in_hosteq(p->ia_addr.sin_addr, ia->ia_addr.sin_addr)) 648 continue; 649 if (p->ia_ifp != ia->ia_ifp) 650 alt_ifa = &p->ia_ifa; 651 if (++ia_count > 1 && alt_ifa != NULL) 652 break; 653 } 654 655 if (ia_count == 0) 656 return; 657 658 rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa); 659 } 660 661 void 662 in_purgeaddr(struct ifaddr *ifa) 663 { 664 struct ifnet *ifp = ifa->ifa_ifp; 665 struct in_ifaddr *ia = (void *) ifa; 666 667 /* stop DAD processing */ 668 if (ia->ia_dad_stop != NULL) 669 ia->ia_dad_stop(ifa); 670 671 in_ifscrub(ifp, ia); 672 in_ifremlocal(ifa); 673 LIST_REMOVE(ia, ia_hash); 674 ifa_remove(ifp, &ia->ia_ifa); 675 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_list); 676 if (ia->ia_allhosts != NULL) 677 in_delmulti(ia->ia_allhosts); 678 ifafree(&ia->ia_ifa); 679 in_setmaxmtu(); 680 } 681 682 void 683 in_purgeif(struct ifnet *ifp) /* MUST be called at splsoftnet() */ 684 { 685 if_purgeaddrs(ifp, AF_INET, in_purgeaddr); 686 igmp_purgeif(ifp); /* manipulates pools */ 687 #ifdef MROUTING 688 ip_mrouter_detach(ifp); 689 #endif 690 } 691 692 /* 693 * SIOC[GAD]LIFADDR. 694 * SIOCGLIFADDR: get first address. (???) 695 * SIOCGLIFADDR with IFLR_PREFIX: 696 * get first address that matches the specified prefix. 697 * SIOCALIFADDR: add the specified address. 698 * SIOCALIFADDR with IFLR_PREFIX: 699 * EINVAL since we can't deduce hostid part of the address. 700 * SIOCDLIFADDR: delete the specified address. 701 * SIOCDLIFADDR with IFLR_PREFIX: 702 * delete the first address that matches the specified prefix. 703 * return values: 704 * EINVAL on invalid parameters 705 * EADDRNOTAVAIL on prefix match failed/specified address not found 706 * other values may be returned from in_ioctl() 707 */ 708 static int 709 in_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 710 struct ifnet *ifp) 711 { 712 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 713 struct ifaddr *ifa; 714 struct sockaddr *sa; 715 716 /* sanity checks */ 717 if (data == NULL || ifp == NULL) { 718 panic("invalid argument to in_lifaddr_ioctl"); 719 /*NOTRECHED*/ 720 } 721 722 switch (cmd) { 723 case SIOCGLIFADDR: 724 /* address must be specified on GET with IFLR_PREFIX */ 725 if ((iflr->flags & IFLR_PREFIX) == 0) 726 break; 727 /*FALLTHROUGH*/ 728 case SIOCALIFADDR: 729 case SIOCDLIFADDR: 730 /* address must be specified on ADD and DELETE */ 731 sa = (struct sockaddr *)&iflr->addr; 732 if (sa->sa_family != AF_INET) 733 return EINVAL; 734 if (sa->sa_len != sizeof(struct sockaddr_in)) 735 return EINVAL; 736 /* XXX need improvement */ 737 sa = (struct sockaddr *)&iflr->dstaddr; 738 if (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET) 739 return EINVAL; 740 if (sa->sa_len != 0 && sa->sa_len != sizeof(struct sockaddr_in)) 741 return EINVAL; 742 break; 743 default: /*shouldn't happen*/ 744 #if 0 745 panic("invalid cmd to in_lifaddr_ioctl"); 746 /*NOTREACHED*/ 747 #else 748 return EOPNOTSUPP; 749 #endif 750 } 751 if (sizeof(struct in_addr) * NBBY < iflr->prefixlen) 752 return EINVAL; 753 754 switch (cmd) { 755 case SIOCALIFADDR: 756 { 757 struct in_aliasreq ifra; 758 759 if (iflr->flags & IFLR_PREFIX) 760 return EINVAL; 761 762 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ 763 memset(&ifra, 0, sizeof(ifra)); 764 memcpy(ifra.ifra_name, iflr->iflr_name, 765 sizeof(ifra.ifra_name)); 766 767 memcpy(&ifra.ifra_addr, &iflr->addr, 768 ((struct sockaddr *)&iflr->addr)->sa_len); 769 770 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 771 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 772 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 773 } 774 775 ifra.ifra_mask.sin_family = AF_INET; 776 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 777 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 778 779 return in_control(so, SIOCAIFADDR, &ifra, ifp); 780 } 781 case SIOCGLIFADDR: 782 case SIOCDLIFADDR: 783 { 784 struct in_ifaddr *ia; 785 struct in_addr mask, candidate, match; 786 struct sockaddr_in *sin; 787 int cmp; 788 789 memset(&mask, 0, sizeof(mask)); 790 memset(&match, 0, sizeof(match)); /* XXX gcc */ 791 if (iflr->flags & IFLR_PREFIX) { 792 /* lookup a prefix rather than address. */ 793 in_len2mask(&mask, iflr->prefixlen); 794 795 sin = (struct sockaddr_in *)&iflr->addr; 796 match.s_addr = sin->sin_addr.s_addr; 797 match.s_addr &= mask.s_addr; 798 799 /* if you set extra bits, that's wrong */ 800 if (match.s_addr != sin->sin_addr.s_addr) 801 return EINVAL; 802 803 cmp = 1; 804 } else { 805 if (cmd == SIOCGLIFADDR) { 806 /* on getting an address, take the 1st match */ 807 cmp = 0; /*XXX*/ 808 } else { 809 /* on deleting an address, do exact match */ 810 in_len2mask(&mask, 32); 811 sin = (struct sockaddr_in *)&iflr->addr; 812 match.s_addr = sin->sin_addr.s_addr; 813 814 cmp = 1; 815 } 816 } 817 818 IFADDR_FOREACH(ifa, ifp) { 819 if (ifa->ifa_addr->sa_family != AF_INET) 820 continue; 821 if (cmp == 0) 822 break; 823 candidate.s_addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr; 824 candidate.s_addr &= mask.s_addr; 825 if (candidate.s_addr == match.s_addr) 826 break; 827 } 828 if (ifa == NULL) 829 return EADDRNOTAVAIL; 830 ia = (struct in_ifaddr *)ifa; 831 832 if (cmd == SIOCGLIFADDR) { 833 /* fill in the if_laddrreq structure */ 834 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin_len); 835 836 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 837 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 838 ia->ia_dstaddr.sin_len); 839 } else 840 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 841 842 iflr->prefixlen = 843 in_mask2len(&ia->ia_sockmask.sin_addr); 844 845 iflr->flags = 0; /*XXX*/ 846 847 return 0; 848 } else { 849 struct in_aliasreq ifra; 850 851 /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ 852 memset(&ifra, 0, sizeof(ifra)); 853 memcpy(ifra.ifra_name, iflr->iflr_name, 854 sizeof(ifra.ifra_name)); 855 856 memcpy(&ifra.ifra_addr, &ia->ia_addr, 857 ia->ia_addr.sin_len); 858 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 859 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 860 ia->ia_dstaddr.sin_len); 861 } 862 memcpy(&ifra.ifra_dstaddr, &ia->ia_sockmask, 863 ia->ia_sockmask.sin_len); 864 865 return in_control(so, SIOCDIFADDR, &ifra, ifp); 866 } 867 } 868 } 869 870 return EOPNOTSUPP; /*just for safety*/ 871 } 872 873 /* 874 * Delete any existing route for an interface. 875 */ 876 void 877 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 878 { 879 880 in_scrubprefix(ia); 881 } 882 883 /* 884 * Initialize an interface's internet address 885 * and routing table entry. 886 */ 887 int 888 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 889 const struct sockaddr_in *sin, int scrub, int hostIsNew) 890 { 891 u_int32_t i; 892 struct sockaddr_in oldaddr; 893 int s = splnet(), flags = RTF_UP, error; 894 895 if (sin == NULL) 896 sin = &ia->ia_addr; 897 898 /* 899 * Set up new addresses. 900 */ 901 oldaddr = ia->ia_addr; 902 if (ia->ia_addr.sin_family == AF_INET) 903 LIST_REMOVE(ia, ia_hash); 904 ia->ia_addr = *sin; 905 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 906 907 /* Set IN_IFF flags early for if_addr_init() */ 908 if (hostIsNew && if_do_dad(ifp) && !in_nullhost(ia->ia_addr.sin_addr)) { 909 if (ifp->if_link_state == LINK_STATE_DOWN) 910 ia->ia4_flags |= IN_IFF_DETACHED; 911 else 912 /* State the intent to try DAD if possible */ 913 ia->ia4_flags |= IN_IFF_TRYTENTATIVE; 914 } 915 916 /* 917 * Give the interface a chance to initialize 918 * if this is its first address, 919 * and to validate the address if necessary. 920 */ 921 if ((error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) 922 goto bad; 923 /* Now clear the try tentative flag, it's job is done. */ 924 ia->ia4_flags &= ~IN_IFF_TRYTENTATIVE; 925 splx(s); 926 927 if (scrub) { 928 ia->ia_ifa.ifa_addr = sintosa(&oldaddr); 929 in_ifscrub(ifp, ia); 930 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 931 } 932 933 /* Add the local route to the address */ 934 in_ifaddlocal(&ia->ia_ifa); 935 936 i = ia->ia_addr.sin_addr.s_addr; 937 if (IN_CLASSA(i)) 938 ia->ia_netmask = IN_CLASSA_NET; 939 else if (IN_CLASSB(i)) 940 ia->ia_netmask = IN_CLASSB_NET; 941 else 942 ia->ia_netmask = IN_CLASSC_NET; 943 /* 944 * The subnet mask usually includes at least the standard network part, 945 * but may may be smaller in the case of supernetting. 946 * If it is set, we believe it. 947 */ 948 if (ia->ia_subnetmask == 0) { 949 ia->ia_subnetmask = ia->ia_netmask; 950 ia->ia_sockmask.sin_addr.s_addr = ia->ia_subnetmask; 951 } else 952 ia->ia_netmask &= ia->ia_subnetmask; 953 954 ia->ia_net = i & ia->ia_netmask; 955 ia->ia_subnet = i & ia->ia_subnetmask; 956 in_socktrim(&ia->ia_sockmask); 957 /* re-calculate the "in_maxmtu" value */ 958 in_setmaxmtu(); 959 /* 960 * Add route for the network. 961 */ 962 ia->ia_ifa.ifa_metric = ifp->if_metric; 963 if (ifp->if_flags & IFF_BROADCAST) { 964 ia->ia_broadaddr.sin_addr.s_addr = 965 ia->ia_subnet | ~ia->ia_subnetmask; 966 ia->ia_netbroadcast.s_addr = 967 ia->ia_net | ~ia->ia_netmask; 968 } else if (ifp->if_flags & IFF_LOOPBACK) { 969 ia->ia_dstaddr = ia->ia_addr; 970 flags |= RTF_HOST; 971 } else if (ifp->if_flags & IFF_POINTOPOINT) { 972 if (ia->ia_dstaddr.sin_family != AF_INET) 973 return (0); 974 flags |= RTF_HOST; 975 } 976 error = in_addprefix(ia, flags); 977 /* 978 * If the interface supports multicast, join the "all hosts" 979 * multicast group on that interface. 980 */ 981 if ((ifp->if_flags & IFF_MULTICAST) != 0 && ia->ia_allhosts == NULL) { 982 struct in_addr addr; 983 984 addr.s_addr = INADDR_ALLHOSTS_GROUP; 985 ia->ia_allhosts = in_addmulti(&addr, ifp); 986 } 987 988 if (hostIsNew && if_do_dad(ifp) && 989 !in_nullhost(ia->ia_addr.sin_addr) && 990 ia->ia4_flags & IN_IFF_TENTATIVE) 991 ia->ia_dad_start((struct ifaddr *)ia); 992 993 return (error); 994 bad: 995 splx(s); 996 LIST_REMOVE(ia, ia_hash); 997 ia->ia_addr = oldaddr; 998 if (ia->ia_addr.sin_family == AF_INET) 999 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), 1000 ia, ia_hash); 1001 return (error); 1002 } 1003 1004 #define rtinitflags(x) \ 1005 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 1006 ? RTF_HOST : 0) 1007 1008 /* 1009 * add a route to prefix ("connected route" in cisco terminology). 1010 * does nothing if there's some interface address with the same prefix already. 1011 */ 1012 static int 1013 in_addprefix(struct in_ifaddr *target, int flags) 1014 { 1015 struct in_ifaddr *ia; 1016 struct in_addr prefix, mask, p; 1017 int error; 1018 1019 if ((flags & RTF_HOST) != 0) 1020 prefix = target->ia_dstaddr.sin_addr; 1021 else { 1022 prefix = target->ia_addr.sin_addr; 1023 mask = target->ia_sockmask.sin_addr; 1024 prefix.s_addr &= mask.s_addr; 1025 } 1026 1027 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 1028 if (rtinitflags(ia)) 1029 p = ia->ia_dstaddr.sin_addr; 1030 else { 1031 p = ia->ia_addr.sin_addr; 1032 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1033 } 1034 1035 if (prefix.s_addr != p.s_addr) 1036 continue; 1037 1038 /* 1039 * if we got a matching prefix route inserted by other 1040 * interface address, we don't need to bother 1041 * 1042 * XXX RADIX_MPATH implications here? -dyoung 1043 */ 1044 if (ia->ia_flags & IFA_ROUTE) 1045 return 0; 1046 } 1047 1048 /* 1049 * noone seem to have prefix route. insert it. 1050 */ 1051 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1052 if (error == 0) 1053 target->ia_flags |= IFA_ROUTE; 1054 else if (error == EEXIST) { 1055 /* 1056 * the fact the route already exists is not an error. 1057 */ 1058 error = 0; 1059 } 1060 return error; 1061 } 1062 1063 /* 1064 * remove a route to prefix ("connected route" in cisco terminology). 1065 * re-installs the route by using another interface address, if there's one 1066 * with the same prefix (otherwise we lose the route mistakenly). 1067 */ 1068 static int 1069 in_scrubprefix(struct in_ifaddr *target) 1070 { 1071 struct in_ifaddr *ia; 1072 struct in_addr prefix, mask, p; 1073 int error; 1074 1075 /* If we don't have IFA_ROUTE we should still inform userland */ 1076 if ((target->ia_flags & IFA_ROUTE) == 0) 1077 return 0; 1078 1079 if (rtinitflags(target)) 1080 prefix = target->ia_dstaddr.sin_addr; 1081 else { 1082 prefix = target->ia_addr.sin_addr; 1083 mask = target->ia_sockmask.sin_addr; 1084 prefix.s_addr &= mask.s_addr; 1085 } 1086 1087 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 1088 if (rtinitflags(ia)) 1089 p = ia->ia_dstaddr.sin_addr; 1090 else { 1091 p = ia->ia_addr.sin_addr; 1092 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1093 } 1094 1095 if (prefix.s_addr != p.s_addr) 1096 continue; 1097 1098 /* 1099 * if we got a matching prefix route, move IFA_ROUTE to him 1100 */ 1101 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1102 rtinit(&target->ia_ifa, RTM_DELETE, 1103 rtinitflags(target)); 1104 target->ia_flags &= ~IFA_ROUTE; 1105 1106 error = rtinit(&ia->ia_ifa, RTM_ADD, 1107 rtinitflags(ia) | RTF_UP); 1108 if (error == 0) 1109 ia->ia_flags |= IFA_ROUTE; 1110 return error; 1111 } 1112 } 1113 1114 /* 1115 * noone seem to have prefix route. remove it. 1116 */ 1117 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1118 target->ia_flags &= ~IFA_ROUTE; 1119 return 0; 1120 } 1121 1122 #undef rtinitflags 1123 1124 /* 1125 * Return 1 if the address might be a local broadcast address. 1126 */ 1127 int 1128 in_broadcast(struct in_addr in, struct ifnet *ifp) 1129 { 1130 struct ifaddr *ifa; 1131 1132 if (in.s_addr == INADDR_BROADCAST || 1133 in_nullhost(in)) 1134 return 1; 1135 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1136 return 0; 1137 /* 1138 * Look through the list of addresses for a match 1139 * with a broadcast address. 1140 */ 1141 #define ia (ifatoia(ifa)) 1142 IFADDR_FOREACH(ifa, ifp) 1143 if (ifa->ifa_addr->sa_family == AF_INET && 1144 !in_hosteq(in, ia->ia_addr.sin_addr) && 1145 (in_hosteq(in, ia->ia_broadaddr.sin_addr) || 1146 in_hosteq(in, ia->ia_netbroadcast) || 1147 (hostzeroisbroadcast && 1148 /* 1149 * Check for old-style (host 0) broadcast. 1150 */ 1151 (in.s_addr == ia->ia_subnet || 1152 in.s_addr == ia->ia_net)))) 1153 return 1; 1154 return (0); 1155 #undef ia 1156 } 1157 1158 /* 1159 * perform DAD when interface becomes IFF_UP. 1160 */ 1161 void 1162 in_if_link_up(struct ifnet *ifp) 1163 { 1164 struct ifaddr *ifa; 1165 struct in_ifaddr *ia; 1166 1167 /* Ensure it's sane to run DAD */ 1168 if (ifp->if_link_state == LINK_STATE_DOWN) 1169 return; 1170 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 1171 return; 1172 1173 IFADDR_FOREACH(ifa, ifp) { 1174 if (ifa->ifa_addr->sa_family != AF_INET) 1175 continue; 1176 ia = (struct in_ifaddr *)ifa; 1177 1178 /* If detached then mark as tentative */ 1179 if (ia->ia4_flags & IN_IFF_DETACHED) { 1180 ia->ia4_flags &= ~IN_IFF_DETACHED; 1181 if (if_do_dad(ifp) && ia->ia_dad_start != NULL) 1182 ia->ia4_flags |= IN_IFF_TENTATIVE; 1183 else if ((ia->ia4_flags & IN_IFF_TENTATIVE) == 0) 1184 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 1185 } 1186 1187 if (ia->ia4_flags & IN_IFF_TENTATIVE) { 1188 /* Clear the duplicated flag as we're starting DAD. */ 1189 ia->ia4_flags &= ~IN_IFF_DUPLICATED; 1190 ia->ia_dad_start(ifa); 1191 } 1192 } 1193 } 1194 1195 void 1196 in_if_up(struct ifnet *ifp) 1197 { 1198 1199 /* interface may not support link state, so bring it up also */ 1200 in_if_link_up(ifp); 1201 } 1202 1203 /* 1204 * Mark all addresses as detached. 1205 */ 1206 void 1207 in_if_link_down(struct ifnet *ifp) 1208 { 1209 struct ifaddr *ifa; 1210 struct in_ifaddr *ia; 1211 1212 IFADDR_FOREACH(ifa, ifp) { 1213 if (ifa->ifa_addr->sa_family != AF_INET) 1214 continue; 1215 ia = (struct in_ifaddr *)ifa; 1216 1217 /* Stop DAD processing */ 1218 if (ia->ia_dad_stop != NULL) 1219 ia->ia_dad_stop(ifa); 1220 1221 /* 1222 * Mark the address as detached. 1223 */ 1224 if (!(ia->ia4_flags & IN_IFF_DETACHED)) { 1225 ia->ia4_flags |= IN_IFF_DETACHED; 1226 ia->ia4_flags &= 1227 ~(IN_IFF_TENTATIVE | IN_IFF_DUPLICATED); 1228 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 1229 } 1230 } 1231 } 1232 1233 void 1234 in_if_down(struct ifnet *ifp) 1235 { 1236 1237 in_if_link_down(ifp); 1238 } 1239 1240 void 1241 in_if_link_state_change(struct ifnet *ifp, int link_state) 1242 { 1243 1244 switch (link_state) { 1245 case LINK_STATE_DOWN: 1246 in_if_link_down(ifp); 1247 break; 1248 case LINK_STATE_UP: 1249 in_if_link_up(ifp); 1250 break; 1251 } 1252 } 1253 1254 /* 1255 * in_lookup_multi: look up the in_multi record for a given IP 1256 * multicast address on a given interface. If no matching record is 1257 * found, return NULL. 1258 */ 1259 struct in_multi * 1260 in_lookup_multi(struct in_addr addr, ifnet_t *ifp) 1261 { 1262 struct in_multi *inm; 1263 1264 KASSERT(rw_lock_held(&in_multilock)); 1265 1266 LIST_FOREACH(inm, &IN_MULTI_HASH(addr.s_addr, ifp), inm_list) { 1267 if (in_hosteq(inm->inm_addr, addr) && inm->inm_ifp == ifp) 1268 break; 1269 } 1270 return inm; 1271 } 1272 1273 /* 1274 * in_multi_group: check whether the address belongs to an IP multicast 1275 * group we are joined on this interface. Returns true or false. 1276 */ 1277 bool 1278 in_multi_group(struct in_addr addr, ifnet_t *ifp, int flags) 1279 { 1280 bool ingroup; 1281 1282 if (__predict_true(flags & IP_IGMP_MCAST) == 0) { 1283 rw_enter(&in_multilock, RW_READER); 1284 ingroup = in_lookup_multi(addr, ifp) != NULL; 1285 rw_exit(&in_multilock); 1286 } else { 1287 /* XXX Recursive call from ip_output(). */ 1288 KASSERT(rw_lock_held(&in_multilock)); 1289 ingroup = in_lookup_multi(addr, ifp) != NULL; 1290 } 1291 return ingroup; 1292 } 1293 1294 /* 1295 * Add an address to the list of IP multicast addresses for a given interface. 1296 */ 1297 struct in_multi * 1298 in_addmulti(struct in_addr *ap, ifnet_t *ifp) 1299 { 1300 struct sockaddr_in sin; 1301 struct in_multi *inm; 1302 1303 /* 1304 * See if address already in list. 1305 */ 1306 rw_enter(&in_multilock, RW_WRITER); 1307 inm = in_lookup_multi(*ap, ifp); 1308 if (inm != NULL) { 1309 /* 1310 * Found it; just increment the reference count. 1311 */ 1312 inm->inm_refcount++; 1313 rw_exit(&in_multilock); 1314 return inm; 1315 } 1316 1317 /* 1318 * New address; allocate a new multicast record. 1319 */ 1320 inm = pool_get(&inmulti_pool, PR_NOWAIT); 1321 if (inm == NULL) { 1322 rw_exit(&in_multilock); 1323 return NULL; 1324 } 1325 inm->inm_addr = *ap; 1326 inm->inm_ifp = ifp; 1327 inm->inm_refcount = 1; 1328 1329 /* 1330 * Ask the network driver to update its multicast reception 1331 * filter appropriately for the new address. 1332 */ 1333 sockaddr_in_init(&sin, ap, 0); 1334 if (if_mcast_op(ifp, SIOCADDMULTI, sintosa(&sin)) != 0) { 1335 rw_exit(&in_multilock); 1336 pool_put(&inmulti_pool, inm); 1337 return NULL; 1338 } 1339 1340 /* 1341 * Let IGMP know that we have joined a new IP multicast group. 1342 */ 1343 if (igmp_joingroup(inm) != 0) { 1344 rw_exit(&in_multilock); 1345 pool_put(&inmulti_pool, inm); 1346 return NULL; 1347 } 1348 LIST_INSERT_HEAD( 1349 &IN_MULTI_HASH(inm->inm_addr.s_addr, ifp), 1350 inm, inm_list); 1351 in_multientries++; 1352 rw_exit(&in_multilock); 1353 1354 return inm; 1355 } 1356 1357 /* 1358 * Delete a multicast address record. 1359 */ 1360 void 1361 in_delmulti(struct in_multi *inm) 1362 { 1363 struct sockaddr_in sin; 1364 1365 rw_enter(&in_multilock, RW_WRITER); 1366 if (--inm->inm_refcount > 0) { 1367 rw_exit(&in_multilock); 1368 return; 1369 } 1370 1371 /* 1372 * No remaining claims to this record; let IGMP know that 1373 * we are leaving the multicast group. 1374 */ 1375 igmp_leavegroup(inm); 1376 1377 /* 1378 * Notify the network driver to update its multicast reception 1379 * filter. 1380 */ 1381 sockaddr_in_init(&sin, &inm->inm_addr, 0); 1382 if_mcast_op(inm->inm_ifp, SIOCDELMULTI, sintosa(&sin)); 1383 1384 /* 1385 * Unlink from list. 1386 */ 1387 LIST_REMOVE(inm, inm_list); 1388 in_multientries--; 1389 rw_exit(&in_multilock); 1390 1391 pool_put(&inmulti_pool, inm); 1392 } 1393 1394 /* 1395 * in_next_multi: step through all of the in_multi records, one at a time. 1396 * The current position is remembered in "step", which the caller must 1397 * provide. in_first_multi(), below, must be called to initialize "step" 1398 * and get the first record. Both macros return a NULL "inm" when there 1399 * are no remaining records. 1400 */ 1401 struct in_multi * 1402 in_next_multi(struct in_multistep *step) 1403 { 1404 struct in_multi *inm; 1405 1406 KASSERT(rw_lock_held(&in_multilock)); 1407 1408 while (step->i_inm == NULL && step->i_n < IN_MULTI_HASH_SIZE) { 1409 step->i_inm = LIST_FIRST(&in_multihashtbl[++step->i_n]); 1410 } 1411 if ((inm = step->i_inm) != NULL) { 1412 step->i_inm = LIST_NEXT(inm, inm_list); 1413 } 1414 return inm; 1415 } 1416 1417 struct in_multi * 1418 in_first_multi(struct in_multistep *step) 1419 { 1420 KASSERT(rw_lock_held(&in_multilock)); 1421 1422 step->i_n = 0; 1423 step->i_inm = LIST_FIRST(&in_multihashtbl[0]); 1424 return in_next_multi(step); 1425 } 1426 1427 void 1428 in_multi_lock(int op) 1429 { 1430 rw_enter(&in_multilock, op); 1431 } 1432 1433 void 1434 in_multi_unlock(void) 1435 { 1436 rw_exit(&in_multilock); 1437 } 1438 1439 int 1440 in_multi_lock_held(void) 1441 { 1442 return rw_lock_held(&in_multilock); 1443 } 1444 1445 struct sockaddr_in * 1446 in_selectsrc(struct sockaddr_in *sin, struct route *ro, 1447 int soopts, struct ip_moptions *mopts, int *errorp) 1448 { 1449 struct rtentry *rt = NULL; 1450 struct in_ifaddr *ia = NULL; 1451 1452 /* 1453 * If route is known or can be allocated now, take the 1454 * source address from the interface. Otherwise, punt. 1455 */ 1456 if ((soopts & SO_DONTROUTE) != 0) 1457 rtcache_free(ro); 1458 else { 1459 union { 1460 struct sockaddr dst; 1461 struct sockaddr_in dst4; 1462 } u; 1463 1464 sockaddr_in_init(&u.dst4, &sin->sin_addr, 0); 1465 rt = rtcache_lookup(ro, &u.dst); 1466 } 1467 /* 1468 * If we found a route, use the address 1469 * corresponding to the outgoing interface 1470 * unless it is the loopback (in case a route 1471 * to our address on another net goes to loopback). 1472 * 1473 * XXX Is this still true? Do we care? 1474 */ 1475 if (rt != NULL && (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 1476 ia = ifatoia(rt->rt_ifa); 1477 if (ia == NULL) { 1478 u_int16_t fport = sin->sin_port; 1479 1480 sin->sin_port = 0; 1481 ia = ifatoia(ifa_ifwithladdr(sintosa(sin))); 1482 sin->sin_port = fport; 1483 if (ia == NULL) { 1484 /* Find 1st non-loopback AF_INET address */ 1485 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 1486 if (!(ia->ia_ifp->if_flags & IFF_LOOPBACK)) 1487 break; 1488 } 1489 } 1490 if (ia == NULL) { 1491 *errorp = EADDRNOTAVAIL; 1492 return NULL; 1493 } 1494 } 1495 /* 1496 * If the destination address is multicast and an outgoing 1497 * interface has been set as a multicast option, use the 1498 * address of that interface as our source address. 1499 */ 1500 if (IN_MULTICAST(sin->sin_addr.s_addr) && mopts != NULL) { 1501 struct ip_moptions *imo; 1502 struct ifnet *ifp; 1503 1504 imo = mopts; 1505 if (imo->imo_multicast_ifp != NULL) { 1506 ifp = imo->imo_multicast_ifp; 1507 IFP_TO_IA(ifp, ia); /* XXX */ 1508 if (ia == 0 || ia->ia4_flags & IN_IFF_NOTREADY) { 1509 *errorp = EADDRNOTAVAIL; 1510 return NULL; 1511 } 1512 } 1513 } 1514 if (ia->ia_ifa.ifa_getifa != NULL) { 1515 ia = ifatoia((*ia->ia_ifa.ifa_getifa)(&ia->ia_ifa, 1516 sintosa(sin))); 1517 if (ia == NULL) { 1518 *errorp = EADDRNOTAVAIL; 1519 return NULL; 1520 } 1521 } 1522 #ifdef GETIFA_DEBUG 1523 else 1524 printf("%s: missing ifa_getifa\n", __func__); 1525 #endif 1526 return satosin(&ia->ia_addr); 1527 } 1528 1529 static void 1530 in_sysctl_init(struct sysctllog **clog) 1531 { 1532 sysctl_createv(clog, 0, NULL, NULL, 1533 CTLFLAG_PERMANENT, 1534 CTLTYPE_NODE, "inet", 1535 SYSCTL_DESCR("PF_INET related settings"), 1536 NULL, 0, NULL, 0, 1537 CTL_NET, PF_INET, CTL_EOL); 1538 sysctl_createv(clog, 0, NULL, NULL, 1539 CTLFLAG_PERMANENT, 1540 CTLTYPE_NODE, "ip", 1541 SYSCTL_DESCR("IPv4 related settings"), 1542 NULL, 0, NULL, 0, 1543 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1544 1545 sysctl_createv(clog, 0, NULL, NULL, 1546 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1547 CTLTYPE_INT, "subnetsarelocal", 1548 SYSCTL_DESCR("Whether logical subnets are considered " 1549 "local"), 1550 NULL, 0, &subnetsarelocal, 0, 1551 CTL_NET, PF_INET, IPPROTO_IP, 1552 IPCTL_SUBNETSARELOCAL, CTL_EOL); 1553 sysctl_createv(clog, 0, NULL, NULL, 1554 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1555 CTLTYPE_INT, "hostzerobroadcast", 1556 SYSCTL_DESCR("All zeroes address is broadcast address"), 1557 NULL, 0, &hostzeroisbroadcast, 0, 1558 CTL_NET, PF_INET, IPPROTO_IP, 1559 IPCTL_HOSTZEROBROADCAST, CTL_EOL); 1560 } 1561
Indexes created Mon Sep 22 05:09:51 GMT 2025