in.c revision 1.199
1 /* $NetBSD: in.c,v 1.199 2017/03/17 17:26:20 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 1.199 2017/03/17 17:26:20 roy Exp $"); 95 96 #include "arp.h" 97 98 #ifdef _KERNEL_OPT 99 #include "opt_inet.h" 100 #include "opt_inet_conf.h" 101 #include "opt_mrouting.h" 102 #include "opt_net_mpsafe.h" 103 #endif 104 105 #include <sys/param.h> 106 #include <sys/ioctl.h> 107 #include <sys/errno.h> 108 #include <sys/kernel.h> 109 #include <sys/malloc.h> 110 #include <sys/socket.h> 111 #include <sys/socketvar.h> 112 #include <sys/sysctl.h> 113 #include <sys/systm.h> 114 #include <sys/proc.h> 115 #include <sys/syslog.h> 116 #include <sys/kauth.h> 117 #include <sys/kmem.h> 118 119 #include <sys/cprng.h> 120 121 #include <net/if.h> 122 #include <net/route.h> 123 #include <net/pfil.h> 124 125 #include <net/if_arp.h> 126 #include <net/if_ether.h> 127 #include <net/if_types.h> 128 #include <net/if_llatbl.h> 129 #include <net/if_dl.h> 130 131 #include <netinet/in_systm.h> 132 #include <netinet/in.h> 133 #include <netinet/in_var.h> 134 #include <netinet/ip.h> 135 #include <netinet/ip_var.h> 136 #include <netinet/in_ifattach.h> 137 #include <netinet/in_pcb.h> 138 #include <netinet/in_selsrc.h> 139 #include <netinet/if_inarp.h> 140 #include <netinet/ip_mroute.h> 141 #include <netinet/igmp_var.h> 142 143 #ifdef IPSELSRC 144 #include <netinet/in_selsrc.h> 145 #endif 146 147 static u_int in_mask2len(struct in_addr *); 148 static void in_len2mask(struct in_addr *, u_int); 149 static int in_lifaddr_ioctl(struct socket *, u_long, void *, 150 struct ifnet *); 151 152 static void in_addrhash_insert_locked(struct in_ifaddr *); 153 static void in_addrhash_remove_locked(struct in_ifaddr *); 154 155 static int in_addprefix(struct in_ifaddr *, int); 156 static void in_scrubaddr(struct in_ifaddr *); 157 static int in_scrubprefix(struct in_ifaddr *); 158 static void in_sysctl_init(struct sysctllog **); 159 160 #ifndef SUBNETSARELOCAL 161 #define SUBNETSARELOCAL 1 162 #endif 163 164 #ifndef HOSTZEROBROADCAST 165 #define HOSTZEROBROADCAST 0 166 #endif 167 168 /* Note: 61, 127, 251, 509, 1021, 2039 are good. */ 169 #ifndef IN_MULTI_HASH_SIZE 170 #define IN_MULTI_HASH_SIZE 509 171 #endif 172 173 static int subnetsarelocal = SUBNETSARELOCAL; 174 static int hostzeroisbroadcast = HOSTZEROBROADCAST; 175 176 /* 177 * This list is used to keep track of in_multi chains which belong to 178 * deleted interface addresses. We use in_ifaddr so that a chain head 179 * won't be deallocated until all multicast address record are deleted. 180 */ 181 182 LIST_HEAD(in_multihashhead, in_multi); /* Type of the hash head */ 183 184 static struct pool inmulti_pool; 185 static u_int in_multientries; 186 static struct in_multihashhead *in_multihashtbl; 187 static u_long in_multihash; 188 static krwlock_t in_multilock; 189 190 #define IN_MULTI_HASH(x, ifp) \ 191 (in_multihashtbl[(u_long)((x) ^ (ifp->if_index)) % IN_MULTI_HASH_SIZE]) 192 193 /* XXX DEPRECATED. Keep them to avoid breaking kvm(3) users. */ 194 struct in_ifaddrhashhead * in_ifaddrhashtbl; 195 u_long in_ifaddrhash; 196 struct in_ifaddrhead in_ifaddrhead; 197 static kmutex_t in_ifaddr_lock; 198 199 pserialize_t in_ifaddrhash_psz; 200 struct pslist_head * in_ifaddrhashtbl_pslist; 201 u_long in_ifaddrhash_pslist; 202 struct pslist_head in_ifaddrhead_pslist; 203 204 void 205 in_init(void) 206 { 207 pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", 208 NULL, IPL_SOFTNET); 209 TAILQ_INIT(&in_ifaddrhead); 210 PSLIST_INIT(&in_ifaddrhead_pslist); 211 212 in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 213 &in_ifaddrhash); 214 215 in_ifaddrhash_psz = pserialize_create(); 216 in_ifaddrhashtbl_pslist = hashinit(IN_IFADDR_HASH_SIZE, HASH_PSLIST, 217 true, &in_ifaddrhash_pslist); 218 mutex_init(&in_ifaddr_lock, MUTEX_DEFAULT, IPL_NONE); 219 220 in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 221 &in_multihash); 222 rw_init(&in_multilock); 223 224 in_sysctl_init(NULL); 225 } 226 227 /* 228 * Return 1 if an internet address is for a ``local'' host 229 * (one to which we have a connection). If subnetsarelocal 230 * is true, this includes other subnets of the local net. 231 * Otherwise, it includes only the directly-connected (sub)nets. 232 */ 233 int 234 in_localaddr(struct in_addr in) 235 { 236 struct in_ifaddr *ia; 237 int localaddr = 0; 238 int s = pserialize_read_enter(); 239 240 if (subnetsarelocal) { 241 IN_ADDRLIST_READER_FOREACH(ia) { 242 if ((in.s_addr & ia->ia_netmask) == ia->ia_net) { 243 localaddr = 1; 244 break; 245 } 246 } 247 } else { 248 IN_ADDRLIST_READER_FOREACH(ia) { 249 if ((in.s_addr & ia->ia_subnetmask) == ia->ia_subnet) { 250 localaddr = 1; 251 break; 252 } 253 } 254 } 255 pserialize_read_exit(s); 256 257 return localaddr; 258 } 259 260 /* 261 * Determine whether an IP address is in a reserved set of addresses 262 * that may not be forwarded, or whether datagrams to that destination 263 * may be forwarded. 264 */ 265 int 266 in_canforward(struct in_addr in) 267 { 268 u_int32_t net; 269 270 if (IN_EXPERIMENTAL(in.s_addr) || IN_MULTICAST(in.s_addr)) 271 return (0); 272 if (IN_CLASSA(in.s_addr)) { 273 net = in.s_addr & IN_CLASSA_NET; 274 if (net == 0 || net == htonl(IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 275 return (0); 276 } 277 return (1); 278 } 279 280 /* 281 * Trim a mask in a sockaddr 282 */ 283 void 284 in_socktrim(struct sockaddr_in *ap) 285 { 286 char *cplim = (char *) &ap->sin_addr; 287 char *cp = (char *) (&ap->sin_addr + 1); 288 289 ap->sin_len = 0; 290 while (--cp >= cplim) 291 if (*cp) { 292 (ap)->sin_len = cp - (char *) (ap) + 1; 293 break; 294 } 295 } 296 297 /* 298 * Routine to take an Internet address and convert into a 299 * "dotted quad" representation for printing. 300 * Caller has to make sure that buf is at least INET_ADDRSTRLEN long. 301 */ 302 const char * 303 in_fmtaddr(char *buf, struct in_addr addr) 304 { 305 addr.s_addr = ntohl(addr.s_addr); 306 307 snprintf(buf, INET_ADDRSTRLEN, "%d.%d.%d.%d", 308 (addr.s_addr >> 24) & 0xFF, 309 (addr.s_addr >> 16) & 0xFF, 310 (addr.s_addr >> 8) & 0xFF, 311 (addr.s_addr >> 0) & 0xFF); 312 return buf; 313 } 314 315 /* 316 * Maintain the "in_maxmtu" variable, which is the largest 317 * mtu for non-local interfaces with AF_INET addresses assigned 318 * to them that are up. 319 */ 320 unsigned long in_maxmtu; 321 322 void 323 in_setmaxmtu(void) 324 { 325 struct in_ifaddr *ia; 326 struct ifnet *ifp; 327 unsigned long maxmtu = 0; 328 int s = pserialize_read_enter(); 329 330 IN_ADDRLIST_READER_FOREACH(ia) { 331 if ((ifp = ia->ia_ifp) == 0) 332 continue; 333 if ((ifp->if_flags & (IFF_UP|IFF_LOOPBACK)) != IFF_UP) 334 continue; 335 if (ifp->if_mtu > maxmtu) 336 maxmtu = ifp->if_mtu; 337 } 338 if (maxmtu) 339 in_maxmtu = maxmtu; 340 pserialize_read_exit(s); 341 } 342 343 static u_int 344 in_mask2len(struct in_addr *mask) 345 { 346 u_int x, y; 347 u_char *p; 348 349 p = (u_char *)mask; 350 for (x = 0; x < sizeof(*mask); x++) { 351 if (p[x] != 0xff) 352 break; 353 } 354 y = 0; 355 if (x < sizeof(*mask)) { 356 for (y = 0; y < NBBY; y++) { 357 if ((p[x] & (0x80 >> y)) == 0) 358 break; 359 } 360 } 361 return x * NBBY + y; 362 } 363 364 static void 365 in_len2mask(struct in_addr *mask, u_int len) 366 { 367 u_int i; 368 u_char *p; 369 370 p = (u_char *)mask; 371 memset(mask, 0, sizeof(*mask)); 372 for (i = 0; i < len / NBBY; i++) 373 p[i] = 0xff; 374 if (len % NBBY) 375 p[i] = (0xff00 >> (len % NBBY)) & 0xff; 376 } 377 378 /* 379 * Generic internet control operations (ioctl's). 380 * Ifp is 0 if not an interface-specific ioctl. 381 */ 382 /* ARGSUSED */ 383 static int 384 in_control0(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 385 { 386 struct ifreq *ifr = (struct ifreq *)data; 387 struct in_ifaddr *ia = NULL; 388 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 389 struct sockaddr_in oldaddr, *new_dstaddr; 390 int error, hostIsNew, maskIsNew; 391 int newifaddr = 0; 392 bool run_hook = false; 393 bool need_reinsert = false; 394 struct psref psref; 395 int bound; 396 397 switch (cmd) { 398 case SIOCALIFADDR: 399 case SIOCDLIFADDR: 400 case SIOCGLIFADDR: 401 if (ifp == NULL) 402 return EINVAL; 403 return in_lifaddr_ioctl(so, cmd, data, ifp); 404 case SIOCGIFADDRPREF: 405 case SIOCSIFADDRPREF: 406 if (ifp == NULL) 407 return EINVAL; 408 return ifaddrpref_ioctl(so, cmd, data, ifp); 409 } 410 411 bound = curlwp_bind(); 412 /* 413 * Find address for this interface, if it exists. 414 */ 415 if (ifp != NULL) 416 ia = in_get_ia_from_ifp_psref(ifp, &psref); 417 418 hostIsNew = 1; /* moved here to appease gcc */ 419 switch (cmd) { 420 case SIOCAIFADDR: 421 case SIOCDIFADDR: 422 case SIOCGIFALIAS: 423 case SIOCGIFAFLAG_IN: 424 if (ifra->ifra_addr.sin_family == AF_INET) { 425 int s; 426 427 if (ia != NULL) 428 ia4_release(ia, &psref); 429 s = pserialize_read_enter(); 430 IN_ADDRHASH_READER_FOREACH(ia, 431 ifra->ifra_addr.sin_addr.s_addr) { 432 if (ia->ia_ifp == ifp && 433 in_hosteq(ia->ia_addr.sin_addr, 434 ifra->ifra_addr.sin_addr)) 435 break; 436 } 437 if (ia != NULL) 438 ia4_acquire(ia, &psref); 439 pserialize_read_exit(s); 440 } 441 if ((cmd == SIOCDIFADDR || 442 cmd == SIOCGIFALIAS || 443 cmd == SIOCGIFAFLAG_IN) && 444 ia == NULL) { 445 error = EADDRNOTAVAIL; 446 goto out; 447 } 448 449 if (cmd == SIOCDIFADDR && 450 ifra->ifra_addr.sin_family == AF_UNSPEC) { 451 ifra->ifra_addr.sin_family = AF_INET; 452 } 453 /* FALLTHROUGH */ 454 case SIOCSIFADDR: 455 if (ia == NULL || ia->ia_addr.sin_family != AF_INET) 456 ; 457 else if (ifra->ifra_addr.sin_len == 0) { 458 ifra->ifra_addr = ia->ia_addr; 459 hostIsNew = 0; 460 } else if (in_hosteq(ia->ia_addr.sin_addr, 461 ifra->ifra_addr.sin_addr)) 462 hostIsNew = 0; 463 /* FALLTHROUGH */ 464 case SIOCSIFDSTADDR: 465 if (ifra->ifra_addr.sin_family != AF_INET) { 466 error = EAFNOSUPPORT; 467 goto out; 468 } 469 /* FALLTHROUGH */ 470 case SIOCSIFNETMASK: 471 if (ifp == NULL) 472 panic("in_control"); 473 474 if (cmd == SIOCGIFALIAS || cmd == SIOCGIFAFLAG_IN) 475 break; 476 477 if (ia == NULL && 478 (cmd == SIOCSIFNETMASK || cmd == SIOCSIFDSTADDR)) { 479 error = EADDRNOTAVAIL; 480 goto out; 481 } 482 483 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_INTERFACE, 484 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 485 NULL) != 0) { 486 error = EPERM; 487 goto out; 488 } 489 490 if (ia == NULL) { 491 ia = malloc(sizeof(*ia), M_IFADDR, M_WAITOK|M_ZERO); 492 if (ia == NULL) { 493 error = ENOBUFS; 494 goto out; 495 } 496 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 497 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 498 ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask); 499 #ifdef IPSELSRC 500 ia->ia_ifa.ifa_getifa = in_getifa; 501 #else /* IPSELSRC */ 502 ia->ia_ifa.ifa_getifa = NULL; 503 #endif /* IPSELSRC */ 504 ia->ia_sockmask.sin_len = 8; 505 ia->ia_sockmask.sin_family = AF_INET; 506 if (ifp->if_flags & IFF_BROADCAST) { 507 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 508 ia->ia_broadaddr.sin_family = AF_INET; 509 } 510 ia->ia_ifp = ifp; 511 ia->ia_idsalt = cprng_fast32() % 65535; 512 LIST_INIT(&ia->ia_multiaddrs); 513 IN_ADDRHASH_ENTRY_INIT(ia); 514 IN_ADDRLIST_ENTRY_INIT(ia); 515 ifa_psref_init(&ia->ia_ifa); 516 517 newifaddr = 1; 518 } 519 break; 520 521 case SIOCSIFBRDADDR: 522 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_INTERFACE, 523 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 524 NULL) != 0) { 525 error = EPERM; 526 goto out; 527 } 528 /* FALLTHROUGH */ 529 530 case SIOCGIFADDR: 531 case SIOCGIFNETMASK: 532 case SIOCGIFDSTADDR: 533 case SIOCGIFBRDADDR: 534 if (ia == NULL) { 535 error = EADDRNOTAVAIL; 536 goto out; 537 } 538 break; 539 } 540 error = 0; 541 switch (cmd) { 542 543 case SIOCGIFADDR: 544 ifreq_setaddr(cmd, ifr, sintocsa(&ia->ia_addr)); 545 break; 546 547 case SIOCGIFBRDADDR: 548 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 549 error = EINVAL; 550 goto out; 551 } 552 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_broadaddr)); 553 break; 554 555 case SIOCGIFDSTADDR: 556 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 557 error = EINVAL; 558 goto out; 559 } 560 ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_dstaddr)); 561 break; 562 563 case SIOCGIFNETMASK: 564 /* 565 * We keep the number of trailing zero bytes the sin_len field 566 * of ia_sockmask, so we fix this before we pass it back to 567 * userland. 568 */ 569 oldaddr = ia->ia_sockmask; 570 oldaddr.sin_len = sizeof(struct sockaddr_in); 571 ifreq_setaddr(cmd, ifr, (const void *)&oldaddr); 572 break; 573 574 case SIOCSIFDSTADDR: 575 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 576 error = EINVAL; 577 goto out; 578 } 579 oldaddr = ia->ia_dstaddr; 580 ia->ia_dstaddr = *satocsin(ifreq_getdstaddr(cmd, ifr)); 581 if ((error = if_addr_init(ifp, &ia->ia_ifa, false)) != 0) { 582 ia->ia_dstaddr = oldaddr; 583 goto out; 584 } 585 if (ia->ia_flags & IFA_ROUTE) { 586 ia->ia_ifa.ifa_dstaddr = sintosa(&oldaddr); 587 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 588 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 589 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST|RTF_UP); 590 } 591 break; 592 593 case SIOCSIFBRDADDR: 594 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 595 error = EINVAL; 596 goto out; 597 } 598 ia->ia_broadaddr = *satocsin(ifreq_getbroadaddr(cmd, ifr)); 599 break; 600 601 case SIOCSIFADDR: 602 if (!newifaddr) { 603 in_addrhash_remove(ia); 604 need_reinsert = true; 605 } 606 error = in_ifinit(ifp, ia, satocsin(ifreq_getaddr(cmd, ifr)), 607 NULL, 1); 608 609 run_hook = true; 610 break; 611 612 case SIOCSIFNETMASK: 613 in_scrubprefix(ia); 614 ia->ia_sockmask = *satocsin(ifreq_getaddr(cmd, ifr)); 615 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 616 if (!newifaddr) { 617 in_addrhash_remove(ia); 618 need_reinsert = true; 619 } 620 error = in_ifinit(ifp, ia, NULL, NULL, 0); 621 break; 622 623 case SIOCAIFADDR: 624 maskIsNew = 0; 625 if (ifra->ifra_mask.sin_len) { 626 in_scrubprefix(ia); 627 ia->ia_sockmask = ifra->ifra_mask; 628 ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr; 629 maskIsNew = 1; 630 } 631 if ((ifp->if_flags & IFF_POINTOPOINT) && 632 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 633 new_dstaddr = &ifra->ifra_dstaddr; 634 maskIsNew = 1; /* We lie; but the effect's the same */ 635 } else 636 new_dstaddr = NULL; 637 if (ifra->ifra_addr.sin_family == AF_INET && 638 (hostIsNew || maskIsNew)) { 639 if (!newifaddr) { 640 in_addrhash_remove(ia); 641 need_reinsert = true; 642 } 643 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 644 new_dstaddr, 0); 645 } 646 if ((ifp->if_flags & IFF_BROADCAST) && 647 (ifra->ifra_broadaddr.sin_family == AF_INET)) 648 ia->ia_broadaddr = ifra->ifra_broadaddr; 649 run_hook = true; 650 break; 651 652 case SIOCGIFALIAS: 653 ifra->ifra_mask = ia->ia_sockmask; 654 if ((ifp->if_flags & IFF_POINTOPOINT) && 655 (ia->ia_dstaddr.sin_family == AF_INET)) 656 ifra->ifra_dstaddr = ia->ia_dstaddr; 657 else if ((ifp->if_flags & IFF_BROADCAST) && 658 (ia->ia_broadaddr.sin_family == AF_INET)) 659 ifra->ifra_broadaddr = ia->ia_broadaddr; 660 else 661 memset(&ifra->ifra_broadaddr, 0, 662 sizeof(ifra->ifra_broadaddr)); 663 break; 664 665 case SIOCGIFAFLAG_IN: 666 ifr->ifr_addrflags = ia->ia4_flags; 667 break; 668 669 case SIOCDIFADDR: 670 ia4_release(ia, &psref); 671 ifaref(&ia->ia_ifa); 672 in_purgeaddr(&ia->ia_ifa); 673 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa); 674 ifafree(&ia->ia_ifa); 675 ia = NULL; 676 break; 677 678 #ifdef MROUTING 679 case SIOCGETVIFCNT: 680 case SIOCGETSGCNT: 681 error = mrt_ioctl(so, cmd, data); 682 break; 683 #endif /* MROUTING */ 684 685 default: 686 error = ENOTTY; 687 goto out; 688 } 689 690 /* 691 * XXX insert regardless of error to make in_purgeaddr below work. 692 * Need to improve. 693 */ 694 if (newifaddr) { 695 ifaref(&ia->ia_ifa); 696 ifa_insert(ifp, &ia->ia_ifa); 697 698 mutex_enter(&in_ifaddr_lock); 699 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_list); 700 IN_ADDRLIST_WRITER_INSERT_TAIL(ia); 701 in_addrhash_insert_locked(ia); 702 mutex_exit(&in_ifaddr_lock); 703 } else if (need_reinsert) { 704 in_addrhash_insert(ia); 705 } 706 707 if (error == 0) { 708 if (run_hook) 709 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa); 710 } else if (newifaddr) { 711 KASSERT(ia != NULL); 712 in_purgeaddr(&ia->ia_ifa); 713 ia = NULL; 714 } 715 716 out: 717 if (!newifaddr && ia != NULL) 718 ia4_release(ia, &psref); 719 curlwp_bindx(bound); 720 return error; 721 } 722 723 int 724 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 725 { 726 int error; 727 728 #ifndef NET_MPSAFE 729 mutex_enter(softnet_lock); 730 #endif 731 error = in_control0(so, cmd, data, ifp); 732 #ifndef NET_MPSAFE 733 mutex_exit(softnet_lock); 734 #endif 735 736 return error; 737 } 738 739 /* Add ownaddr as loopback rtentry. */ 740 static void 741 in_ifaddlocal(struct ifaddr *ifa) 742 { 743 struct in_ifaddr *ia; 744 745 ia = (struct in_ifaddr *)ifa; 746 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY || 747 (ia->ia_ifp->if_flags & IFF_POINTOPOINT && 748 in_hosteq(ia->ia_dstaddr.sin_addr, ia->ia_addr.sin_addr))) 749 { 750 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 751 return; 752 } 753 754 rt_ifa_addlocal(ifa); 755 } 756 757 /* Remove loopback entry of ownaddr */ 758 static void 759 in_ifremlocal(struct ifaddr *ifa) 760 { 761 struct in_ifaddr *ia, *p; 762 struct ifaddr *alt_ifa = NULL; 763 int ia_count = 0; 764 int s; 765 struct psref psref; 766 int bound = curlwp_bind(); 767 768 ia = (struct in_ifaddr *)ifa; 769 /* Delete the entry if exactly one ifaddr matches the 770 * address, ifa->ifa_addr. */ 771 s = pserialize_read_enter(); 772 IN_ADDRLIST_READER_FOREACH(p) { 773 if (!in_hosteq(p->ia_addr.sin_addr, ia->ia_addr.sin_addr)) 774 continue; 775 if (p->ia_ifp != ia->ia_ifp) 776 alt_ifa = &p->ia_ifa; 777 if (++ia_count > 1 && alt_ifa != NULL) 778 break; 779 } 780 if (alt_ifa != NULL && ia_count > 1) 781 ifa_acquire(alt_ifa, &psref); 782 pserialize_read_exit(s); 783 784 if (ia_count == 0) 785 goto out; 786 787 rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa); 788 if (alt_ifa != NULL && ia_count > 1) 789 ifa_release(alt_ifa, &psref); 790 out: 791 curlwp_bindx(bound); 792 } 793 794 static void 795 in_scrubaddr(struct in_ifaddr *ia) 796 { 797 798 /* stop DAD processing */ 799 if (ia->ia_dad_stop != NULL) 800 ia->ia_dad_stop(&ia->ia_ifa); 801 802 in_scrubprefix(ia); 803 in_ifremlocal(&ia->ia_ifa); 804 805 mutex_enter(&in_ifaddr_lock); 806 if (ia->ia_allhosts != NULL) { 807 in_delmulti(ia->ia_allhosts); 808 ia->ia_allhosts = NULL; 809 } 810 mutex_exit(&in_ifaddr_lock); 811 } 812 813 /* 814 * Depends on it isn't called in concurrent. It should be guaranteed 815 * by ifa->ifa_ifp's ioctl lock. The possible callers are in_control 816 * and if_purgeaddrs; the former is called iva ifa->ifa_ifp's ioctl 817 * and the latter is called via ifa->ifa_ifp's if_detach. The functions 818 * never be executed in concurrent. 819 */ 820 void 821 in_purgeaddr(struct ifaddr *ifa) 822 { 823 struct in_ifaddr *ia = (void *) ifa; 824 struct ifnet *ifp = ifa->ifa_ifp; 825 826 KASSERT(!ifa_held(ifa)); 827 828 ifa->ifa_flags |= IFA_DESTROYING; 829 in_scrubaddr(ia); 830 831 mutex_enter(&in_ifaddr_lock); 832 in_addrhash_remove_locked(ia); 833 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_list); 834 IN_ADDRLIST_WRITER_REMOVE(ia); 835 ifa_remove(ifp, &ia->ia_ifa); 836 #ifdef NET_MPSAFE 837 pserialize_perform(in_ifaddrhash_psz); 838 #endif 839 mutex_exit(&in_ifaddr_lock); 840 IN_ADDRHASH_ENTRY_DESTROY(ia); 841 IN_ADDRLIST_ENTRY_DESTROY(ia); 842 ifafree(&ia->ia_ifa); 843 in_setmaxmtu(); 844 } 845 846 static void 847 in_addrhash_insert_locked(struct in_ifaddr *ia) 848 { 849 850 KASSERT(mutex_owned(&in_ifaddr_lock)); 851 852 LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, 853 ia_hash); 854 IN_ADDRHASH_ENTRY_INIT(ia); 855 IN_ADDRHASH_WRITER_INSERT_HEAD(ia); 856 } 857 858 void 859 in_addrhash_insert(struct in_ifaddr *ia) 860 { 861 862 mutex_enter(&in_ifaddr_lock); 863 in_addrhash_insert_locked(ia); 864 mutex_exit(&in_ifaddr_lock); 865 } 866 867 static void 868 in_addrhash_remove_locked(struct in_ifaddr *ia) 869 { 870 871 KASSERT(mutex_owned(&in_ifaddr_lock)); 872 873 LIST_REMOVE(ia, ia_hash); 874 IN_ADDRHASH_WRITER_REMOVE(ia); 875 } 876 877 void 878 in_addrhash_remove(struct in_ifaddr *ia) 879 { 880 881 mutex_enter(&in_ifaddr_lock); 882 in_addrhash_remove_locked(ia); 883 #ifdef NET_MPSAFE 884 pserialize_perform(in_ifaddrhash_psz); 885 #endif 886 mutex_exit(&in_ifaddr_lock); 887 IN_ADDRHASH_ENTRY_DESTROY(ia); 888 } 889 890 void 891 in_purgeif(struct ifnet *ifp) /* MUST be called at splsoftnet() */ 892 { 893 if_purgeaddrs(ifp, AF_INET, in_purgeaddr); 894 igmp_purgeif(ifp); /* manipulates pools */ 895 #ifdef MROUTING 896 ip_mrouter_detach(ifp); 897 #endif 898 } 899 900 /* 901 * SIOC[GAD]LIFADDR. 902 * SIOCGLIFADDR: get first address. (???) 903 * SIOCGLIFADDR with IFLR_PREFIX: 904 * get first address that matches the specified prefix. 905 * SIOCALIFADDR: add the specified address. 906 * SIOCALIFADDR with IFLR_PREFIX: 907 * EINVAL since we can't deduce hostid part of the address. 908 * SIOCDLIFADDR: delete the specified address. 909 * SIOCDLIFADDR with IFLR_PREFIX: 910 * delete the first address that matches the specified prefix. 911 * return values: 912 * EINVAL on invalid parameters 913 * EADDRNOTAVAIL on prefix match failed/specified address not found 914 * other values may be returned from in_ioctl() 915 */ 916 static int 917 in_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 918 struct ifnet *ifp) 919 { 920 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 921 struct ifaddr *ifa; 922 struct sockaddr *sa; 923 924 /* sanity checks */ 925 if (data == NULL || ifp == NULL) { 926 panic("invalid argument to in_lifaddr_ioctl"); 927 /*NOTRECHED*/ 928 } 929 930 switch (cmd) { 931 case SIOCGLIFADDR: 932 /* address must be specified on GET with IFLR_PREFIX */ 933 if ((iflr->flags & IFLR_PREFIX) == 0) 934 break; 935 /*FALLTHROUGH*/ 936 case SIOCALIFADDR: 937 case SIOCDLIFADDR: 938 /* address must be specified on ADD and DELETE */ 939 sa = (struct sockaddr *)&iflr->addr; 940 if (sa->sa_family != AF_INET) 941 return EINVAL; 942 if (sa->sa_len != sizeof(struct sockaddr_in)) 943 return EINVAL; 944 /* XXX need improvement */ 945 sa = (struct sockaddr *)&iflr->dstaddr; 946 if (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET) 947 return EINVAL; 948 if (sa->sa_len != 0 && sa->sa_len != sizeof(struct sockaddr_in)) 949 return EINVAL; 950 break; 951 default: /*shouldn't happen*/ 952 #if 0 953 panic("invalid cmd to in_lifaddr_ioctl"); 954 /*NOTREACHED*/ 955 #else 956 return EOPNOTSUPP; 957 #endif 958 } 959 if (sizeof(struct in_addr) * NBBY < iflr->prefixlen) 960 return EINVAL; 961 962 switch (cmd) { 963 case SIOCALIFADDR: 964 { 965 struct in_aliasreq ifra; 966 967 if (iflr->flags & IFLR_PREFIX) 968 return EINVAL; 969 970 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ 971 memset(&ifra, 0, sizeof(ifra)); 972 memcpy(ifra.ifra_name, iflr->iflr_name, 973 sizeof(ifra.ifra_name)); 974 975 memcpy(&ifra.ifra_addr, &iflr->addr, 976 ((struct sockaddr *)&iflr->addr)->sa_len); 977 978 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 979 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 980 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 981 } 982 983 ifra.ifra_mask.sin_family = AF_INET; 984 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 985 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 986 987 return in_control(so, SIOCAIFADDR, &ifra, ifp); 988 } 989 case SIOCGLIFADDR: 990 case SIOCDLIFADDR: 991 { 992 struct in_ifaddr *ia; 993 struct in_addr mask, candidate, match; 994 struct sockaddr_in *sin; 995 int cmp, s; 996 997 memset(&mask, 0, sizeof(mask)); 998 memset(&match, 0, sizeof(match)); /* XXX gcc */ 999 if (iflr->flags & IFLR_PREFIX) { 1000 /* lookup a prefix rather than address. */ 1001 in_len2mask(&mask, iflr->prefixlen); 1002 1003 sin = (struct sockaddr_in *)&iflr->addr; 1004 match.s_addr = sin->sin_addr.s_addr; 1005 match.s_addr &= mask.s_addr; 1006 1007 /* if you set extra bits, that's wrong */ 1008 if (match.s_addr != sin->sin_addr.s_addr) 1009 return EINVAL; 1010 1011 cmp = 1; 1012 } else { 1013 if (cmd == SIOCGLIFADDR) { 1014 /* on getting an address, take the 1st match */ 1015 cmp = 0; /*XXX*/ 1016 } else { 1017 /* on deleting an address, do exact match */ 1018 in_len2mask(&mask, 32); 1019 sin = (struct sockaddr_in *)&iflr->addr; 1020 match.s_addr = sin->sin_addr.s_addr; 1021 1022 cmp = 1; 1023 } 1024 } 1025 1026 s = pserialize_read_enter(); 1027 IFADDR_READER_FOREACH(ifa, ifp) { 1028 if (ifa->ifa_addr->sa_family != AF_INET) 1029 continue; 1030 if (cmp == 0) 1031 break; 1032 candidate.s_addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr; 1033 candidate.s_addr &= mask.s_addr; 1034 if (candidate.s_addr == match.s_addr) 1035 break; 1036 } 1037 if (ifa == NULL) { 1038 pserialize_read_exit(s); 1039 return EADDRNOTAVAIL; 1040 } 1041 ia = (struct in_ifaddr *)ifa; 1042 1043 if (cmd == SIOCGLIFADDR) { 1044 /* fill in the if_laddrreq structure */ 1045 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin_len); 1046 1047 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1048 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1049 ia->ia_dstaddr.sin_len); 1050 } else 1051 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1052 1053 iflr->prefixlen = 1054 in_mask2len(&ia->ia_sockmask.sin_addr); 1055 1056 iflr->flags = 0; /*XXX*/ 1057 pserialize_read_exit(s); 1058 1059 return 0; 1060 } else { 1061 struct in_aliasreq ifra; 1062 1063 /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ 1064 memset(&ifra, 0, sizeof(ifra)); 1065 memcpy(ifra.ifra_name, iflr->iflr_name, 1066 sizeof(ifra.ifra_name)); 1067 1068 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1069 ia->ia_addr.sin_len); 1070 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1071 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1072 ia->ia_dstaddr.sin_len); 1073 } 1074 memcpy(&ifra.ifra_dstaddr, &ia->ia_sockmask, 1075 ia->ia_sockmask.sin_len); 1076 pserialize_read_exit(s); 1077 1078 return in_control(so, SIOCDIFADDR, &ifra, ifp); 1079 } 1080 } 1081 } 1082 1083 return EOPNOTSUPP; /*just for safety*/ 1084 } 1085 1086 /* 1087 * Initialize an interface's internet address 1088 * and routing table entry. 1089 */ 1090 int 1091 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 1092 const struct sockaddr_in *sin, const struct sockaddr_in *dst, int scrub) 1093 { 1094 u_int32_t i; 1095 struct sockaddr_in oldaddr, olddst; 1096 int s, oldflags, flags = RTF_UP, error, hostIsNew; 1097 1098 if (sin == NULL) 1099 sin = &ia->ia_addr; 1100 if (dst == NULL) 1101 dst = &ia->ia_dstaddr; 1102 1103 /* 1104 * Set up new addresses. 1105 */ 1106 oldaddr = ia->ia_addr; 1107 olddst = ia->ia_dstaddr; 1108 oldflags = ia->ia4_flags; 1109 ia->ia_addr = *sin; 1110 ia->ia_dstaddr = *dst; 1111 hostIsNew = oldaddr.sin_family != AF_INET || 1112 !in_hosteq(ia->ia_addr.sin_addr, oldaddr.sin_addr); 1113 if (!scrub) 1114 scrub = oldaddr.sin_family != ia->ia_dstaddr.sin_family || 1115 !in_hosteq(ia->ia_dstaddr.sin_addr, olddst.sin_addr); 1116 1117 /* 1118 * Configure address flags. 1119 * We need to do this early because they maybe adjusted 1120 * by if_addr_init depending on the address. 1121 */ 1122 if (ia->ia4_flags & IN_IFF_DUPLICATED) { 1123 ia->ia4_flags &= ~IN_IFF_DUPLICATED; 1124 hostIsNew = 1; 1125 } 1126 if (ifp->if_link_state == LINK_STATE_DOWN) { 1127 ia->ia4_flags |= IN_IFF_DETACHED; 1128 ia->ia4_flags &= ~IN_IFF_TENTATIVE; 1129 } else if (hostIsNew && if_do_dad(ifp)) 1130 ia->ia4_flags |= IN_IFF_TRYTENTATIVE; 1131 1132 /* 1133 * Give the interface a chance to initialize 1134 * if this is its first address, 1135 * and to validate the address if necessary. 1136 */ 1137 s = splsoftnet(); 1138 error = if_addr_init(ifp, &ia->ia_ifa, true); 1139 splx(s); 1140 /* Now clear the try tentative flag, it's job is done. */ 1141 ia->ia4_flags &= ~IN_IFF_TRYTENTATIVE; 1142 if (error != 0) { 1143 ia->ia_addr = oldaddr; 1144 ia->ia_dstaddr = olddst; 1145 ia->ia4_flags = oldflags; 1146 return error; 1147 } 1148 1149 if (scrub || hostIsNew) { 1150 int newflags = ia->ia4_flags; 1151 1152 ia->ia_ifa.ifa_addr = sintosa(&oldaddr); 1153 ia->ia_ifa.ifa_dstaddr = sintosa(&olddst); 1154 ia->ia4_flags = oldflags; 1155 if (hostIsNew) 1156 in_scrubaddr(ia); 1157 else if (scrub) 1158 in_scrubprefix(ia); 1159 ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr); 1160 ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr); 1161 ia->ia4_flags = newflags; 1162 } 1163 1164 i = ia->ia_addr.sin_addr.s_addr; 1165 if (ifp->if_flags & IFF_POINTOPOINT) 1166 ia->ia_netmask = INADDR_BROADCAST; /* default to /32 */ 1167 else if (IN_CLASSA(i)) 1168 ia->ia_netmask = IN_CLASSA_NET; 1169 else if (IN_CLASSB(i)) 1170 ia->ia_netmask = IN_CLASSB_NET; 1171 else 1172 ia->ia_netmask = IN_CLASSC_NET; 1173 /* 1174 * The subnet mask usually includes at least the standard network part, 1175 * but may may be smaller in the case of supernetting. 1176 * If it is set, we believe it. 1177 */ 1178 if (ia->ia_subnetmask == 0) { 1179 ia->ia_subnetmask = ia->ia_netmask; 1180 ia->ia_sockmask.sin_addr.s_addr = ia->ia_subnetmask; 1181 } else 1182 ia->ia_netmask &= ia->ia_subnetmask; 1183 1184 ia->ia_net = i & ia->ia_netmask; 1185 ia->ia_subnet = i & ia->ia_subnetmask; 1186 in_socktrim(&ia->ia_sockmask); 1187 1188 /* re-calculate the "in_maxmtu" value */ 1189 in_setmaxmtu(); 1190 1191 ia->ia_ifa.ifa_metric = ifp->if_metric; 1192 if (ifp->if_flags & IFF_BROADCAST) { 1193 ia->ia_broadaddr.sin_addr.s_addr = 1194 ia->ia_subnet | ~ia->ia_subnetmask; 1195 ia->ia_netbroadcast.s_addr = 1196 ia->ia_net | ~ia->ia_netmask; 1197 } else if (ifp->if_flags & IFF_LOOPBACK) { 1198 ia->ia_dstaddr = ia->ia_addr; 1199 flags |= RTF_HOST; 1200 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1201 if (ia->ia_dstaddr.sin_family != AF_INET) 1202 return (0); 1203 flags |= RTF_HOST; 1204 } 1205 1206 /* Add the local route to the address */ 1207 in_ifaddlocal(&ia->ia_ifa); 1208 1209 /* Add the prefix route for the address */ 1210 error = in_addprefix(ia, flags); 1211 1212 /* 1213 * If the interface supports multicast, join the "all hosts" 1214 * multicast group on that interface. 1215 */ 1216 mutex_enter(&in_ifaddr_lock); 1217 if ((ifp->if_flags & IFF_MULTICAST) != 0 && ia->ia_allhosts == NULL) { 1218 struct in_addr addr; 1219 1220 addr.s_addr = INADDR_ALLHOSTS_GROUP; 1221 ia->ia_allhosts = in_addmulti(&addr, ifp); 1222 } 1223 mutex_exit(&in_ifaddr_lock); 1224 1225 if (hostIsNew && 1226 ia->ia4_flags & IN_IFF_TENTATIVE && 1227 if_do_dad(ifp)) 1228 ia->ia_dad_start((struct ifaddr *)ia); 1229 1230 return error; 1231 } 1232 1233 #define rtinitflags(x) \ 1234 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 1235 ? RTF_HOST : 0) 1236 1237 /* 1238 * add a route to prefix ("connected route" in cisco terminology). 1239 * does nothing if there's some interface address with the same prefix already. 1240 */ 1241 static int 1242 in_addprefix(struct in_ifaddr *target, int flags) 1243 { 1244 struct in_ifaddr *ia; 1245 struct in_addr prefix, mask, p; 1246 int error; 1247 int s; 1248 1249 if ((flags & RTF_HOST) != 0) 1250 prefix = target->ia_dstaddr.sin_addr; 1251 else { 1252 prefix = target->ia_addr.sin_addr; 1253 mask = target->ia_sockmask.sin_addr; 1254 prefix.s_addr &= mask.s_addr; 1255 } 1256 1257 s = pserialize_read_enter(); 1258 IN_ADDRLIST_READER_FOREACH(ia) { 1259 if (rtinitflags(ia)) 1260 p = ia->ia_dstaddr.sin_addr; 1261 else { 1262 p = ia->ia_addr.sin_addr; 1263 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1264 } 1265 1266 if (prefix.s_addr != p.s_addr) 1267 continue; 1268 1269 /* 1270 * if we got a matching prefix route inserted by other 1271 * interface address, we don't need to bother 1272 * 1273 * XXX RADIX_MPATH implications here? -dyoung 1274 */ 1275 if (ia->ia_flags & IFA_ROUTE) { 1276 pserialize_read_exit(s); 1277 return 0; 1278 } 1279 } 1280 pserialize_read_exit(s); 1281 1282 /* 1283 * noone seem to have prefix route. insert it. 1284 */ 1285 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1286 if (error == 0) 1287 target->ia_flags |= IFA_ROUTE; 1288 else if (error == EEXIST) { 1289 /* 1290 * the fact the route already exists is not an error. 1291 */ 1292 error = 0; 1293 } 1294 return error; 1295 } 1296 1297 /* 1298 * remove a route to prefix ("connected route" in cisco terminology). 1299 * re-installs the route by using another interface address, if there's one 1300 * with the same prefix (otherwise we lose the route mistakenly). 1301 */ 1302 static int 1303 in_scrubprefix(struct in_ifaddr *target) 1304 { 1305 struct in_ifaddr *ia; 1306 struct in_addr prefix, mask, p; 1307 int error; 1308 int s; 1309 1310 /* If we don't have IFA_ROUTE we have nothing to do */ 1311 if ((target->ia_flags & IFA_ROUTE) == 0) 1312 return 0; 1313 1314 if (rtinitflags(target)) 1315 prefix = target->ia_dstaddr.sin_addr; 1316 else { 1317 prefix = target->ia_addr.sin_addr; 1318 mask = target->ia_sockmask.sin_addr; 1319 prefix.s_addr &= mask.s_addr; 1320 } 1321 1322 s = pserialize_read_enter(); 1323 IN_ADDRLIST_READER_FOREACH(ia) { 1324 if (rtinitflags(ia)) 1325 p = ia->ia_dstaddr.sin_addr; 1326 else { 1327 p = ia->ia_addr.sin_addr; 1328 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1329 } 1330 1331 if (prefix.s_addr != p.s_addr) 1332 continue; 1333 1334 /* 1335 * if we got a matching prefix route, move IFA_ROUTE to him 1336 */ 1337 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1338 struct psref psref; 1339 int bound = curlwp_bind(); 1340 1341 ia4_acquire(ia, &psref); 1342 pserialize_read_exit(s); 1343 1344 rtinit(&target->ia_ifa, RTM_DELETE, 1345 rtinitflags(target)); 1346 target->ia_flags &= ~IFA_ROUTE; 1347 1348 error = rtinit(&ia->ia_ifa, RTM_ADD, 1349 rtinitflags(ia) | RTF_UP); 1350 if (error == 0) 1351 ia->ia_flags |= IFA_ROUTE; 1352 1353 ia4_release(ia, &psref); 1354 curlwp_bindx(bound); 1355 1356 return error; 1357 } 1358 } 1359 pserialize_read_exit(s); 1360 1361 /* 1362 * noone seem to have prefix route. remove it. 1363 */ 1364 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1365 target->ia_flags &= ~IFA_ROUTE; 1366 return 0; 1367 } 1368 1369 #undef rtinitflags 1370 1371 /* 1372 * Return 1 if the address might be a local broadcast address. 1373 */ 1374 int 1375 in_broadcast(struct in_addr in, struct ifnet *ifp) 1376 { 1377 struct ifaddr *ifa; 1378 int s; 1379 1380 KASSERT(ifp != NULL); 1381 1382 if (in.s_addr == INADDR_BROADCAST || 1383 in_nullhost(in)) 1384 return 1; 1385 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1386 return 0; 1387 /* 1388 * Look through the list of addresses for a match 1389 * with a broadcast address. 1390 */ 1391 #define ia (ifatoia(ifa)) 1392 s = pserialize_read_enter(); 1393 IFADDR_READER_FOREACH(ifa, ifp) { 1394 if (ifa->ifa_addr->sa_family == AF_INET && 1395 !in_hosteq(in, ia->ia_addr.sin_addr) && 1396 (in_hosteq(in, ia->ia_broadaddr.sin_addr) || 1397 in_hosteq(in, ia->ia_netbroadcast) || 1398 (hostzeroisbroadcast && 1399 /* 1400 * Check for old-style (host 0) broadcast. 1401 */ 1402 (in.s_addr == ia->ia_subnet || 1403 in.s_addr == ia->ia_net)))) { 1404 pserialize_read_exit(s); 1405 return 1; 1406 } 1407 } 1408 pserialize_read_exit(s); 1409 return (0); 1410 #undef ia 1411 } 1412 1413 /* 1414 * perform DAD when interface becomes IFF_UP. 1415 */ 1416 void 1417 in_if_link_up(struct ifnet *ifp) 1418 { 1419 struct ifaddr *ifa; 1420 struct in_ifaddr *ia; 1421 int s, bound; 1422 1423 /* Ensure it's sane to run DAD */ 1424 if (ifp->if_link_state == LINK_STATE_DOWN) 1425 return; 1426 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 1427 return; 1428 1429 bound = curlwp_bind(); 1430 s = pserialize_read_enter(); 1431 IFADDR_READER_FOREACH(ifa, ifp) { 1432 struct psref psref; 1433 1434 if (ifa->ifa_addr->sa_family != AF_INET) 1435 continue; 1436 ifa_acquire(ifa, &psref); 1437 pserialize_read_exit(s); 1438 1439 ia = (struct in_ifaddr *)ifa; 1440 1441 /* If detached then mark as tentative */ 1442 if (ia->ia4_flags & IN_IFF_DETACHED) { 1443 ia->ia4_flags &= ~IN_IFF_DETACHED; 1444 if (if_do_dad(ifp) && ia->ia_dad_start != NULL) 1445 ia->ia4_flags |= IN_IFF_TENTATIVE; 1446 else if ((ia->ia4_flags & IN_IFF_TENTATIVE) == 0) 1447 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 1448 } 1449 1450 if (ia->ia4_flags & IN_IFF_TENTATIVE) { 1451 /* Clear the duplicated flag as we're starting DAD. */ 1452 ia->ia4_flags &= ~IN_IFF_DUPLICATED; 1453 ia->ia_dad_start(ifa); 1454 } 1455 1456 s = pserialize_read_enter(); 1457 ifa_release(ifa, &psref); 1458 } 1459 pserialize_read_exit(s); 1460 curlwp_bindx(bound); 1461 } 1462 1463 void 1464 in_if_up(struct ifnet *ifp) 1465 { 1466 1467 /* interface may not support link state, so bring it up also */ 1468 in_if_link_up(ifp); 1469 } 1470 1471 /* 1472 * Mark all addresses as detached. 1473 */ 1474 void 1475 in_if_link_down(struct ifnet *ifp) 1476 { 1477 struct ifaddr *ifa; 1478 struct in_ifaddr *ia; 1479 int s, bound; 1480 1481 bound = curlwp_bind(); 1482 s = pserialize_read_enter(); 1483 IFADDR_READER_FOREACH(ifa, ifp) { 1484 struct psref psref; 1485 1486 if (ifa->ifa_addr->sa_family != AF_INET) 1487 continue; 1488 ifa_acquire(ifa, &psref); 1489 pserialize_read_exit(s); 1490 1491 ia = (struct in_ifaddr *)ifa; 1492 1493 /* Stop DAD processing */ 1494 if (ia->ia_dad_stop != NULL) 1495 ia->ia_dad_stop(ifa); 1496 1497 /* 1498 * Mark the address as detached. 1499 */ 1500 if (!(ia->ia4_flags & IN_IFF_DETACHED)) { 1501 ia->ia4_flags |= IN_IFF_DETACHED; 1502 ia->ia4_flags &= 1503 ~(IN_IFF_TENTATIVE | IN_IFF_DUPLICATED); 1504 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 1505 } 1506 1507 s = pserialize_read_enter(); 1508 ifa_release(ifa, &psref); 1509 } 1510 pserialize_read_exit(s); 1511 curlwp_bindx(bound); 1512 } 1513 1514 void 1515 in_if_down(struct ifnet *ifp) 1516 { 1517 1518 in_if_link_down(ifp); 1519 } 1520 1521 void 1522 in_if_link_state_change(struct ifnet *ifp, int link_state) 1523 { 1524 1525 switch (link_state) { 1526 case LINK_STATE_DOWN: 1527 in_if_link_down(ifp); 1528 break; 1529 case LINK_STATE_UP: 1530 in_if_link_up(ifp); 1531 break; 1532 } 1533 } 1534 1535 /* 1536 * in_lookup_multi: look up the in_multi record for a given IP 1537 * multicast address on a given interface. If no matching record is 1538 * found, return NULL. 1539 */ 1540 struct in_multi * 1541 in_lookup_multi(struct in_addr addr, ifnet_t *ifp) 1542 { 1543 struct in_multi *inm; 1544 1545 KASSERT(rw_lock_held(&in_multilock)); 1546 1547 LIST_FOREACH(inm, &IN_MULTI_HASH(addr.s_addr, ifp), inm_list) { 1548 if (in_hosteq(inm->inm_addr, addr) && inm->inm_ifp == ifp) 1549 break; 1550 } 1551 return inm; 1552 } 1553 1554 /* 1555 * in_multi_group: check whether the address belongs to an IP multicast 1556 * group we are joined on this interface. Returns true or false. 1557 */ 1558 bool 1559 in_multi_group(struct in_addr addr, ifnet_t *ifp, int flags) 1560 { 1561 bool ingroup; 1562 1563 if (__predict_true(flags & IP_IGMP_MCAST) == 0) { 1564 rw_enter(&in_multilock, RW_READER); 1565 ingroup = in_lookup_multi(addr, ifp) != NULL; 1566 rw_exit(&in_multilock); 1567 } else { 1568 /* XXX Recursive call from ip_output(). */ 1569 KASSERT(rw_lock_held(&in_multilock)); 1570 ingroup = in_lookup_multi(addr, ifp) != NULL; 1571 } 1572 return ingroup; 1573 } 1574 1575 /* 1576 * Add an address to the list of IP multicast addresses for a given interface. 1577 */ 1578 struct in_multi * 1579 in_addmulti(struct in_addr *ap, ifnet_t *ifp) 1580 { 1581 struct sockaddr_in sin; 1582 struct in_multi *inm; 1583 1584 /* 1585 * See if address already in list. 1586 */ 1587 rw_enter(&in_multilock, RW_WRITER); 1588 inm = in_lookup_multi(*ap, ifp); 1589 if (inm != NULL) { 1590 /* 1591 * Found it; just increment the reference count. 1592 */ 1593 inm->inm_refcount++; 1594 rw_exit(&in_multilock); 1595 return inm; 1596 } 1597 1598 /* 1599 * New address; allocate a new multicast record. 1600 */ 1601 inm = pool_get(&inmulti_pool, PR_NOWAIT); 1602 if (inm == NULL) { 1603 rw_exit(&in_multilock); 1604 return NULL; 1605 } 1606 inm->inm_addr = *ap; 1607 inm->inm_ifp = ifp; 1608 inm->inm_refcount = 1; 1609 1610 /* 1611 * Ask the network driver to update its multicast reception 1612 * filter appropriately for the new address. 1613 */ 1614 sockaddr_in_init(&sin, ap, 0); 1615 if (if_mcast_op(ifp, SIOCADDMULTI, sintosa(&sin)) != 0) { 1616 rw_exit(&in_multilock); 1617 pool_put(&inmulti_pool, inm); 1618 return NULL; 1619 } 1620 1621 /* 1622 * Let IGMP know that we have joined a new IP multicast group. 1623 */ 1624 if (igmp_joingroup(inm) != 0) { 1625 rw_exit(&in_multilock); 1626 pool_put(&inmulti_pool, inm); 1627 return NULL; 1628 } 1629 LIST_INSERT_HEAD( 1630 &IN_MULTI_HASH(inm->inm_addr.s_addr, ifp), 1631 inm, inm_list); 1632 in_multientries++; 1633 rw_exit(&in_multilock); 1634 1635 return inm; 1636 } 1637 1638 /* 1639 * Delete a multicast address record. 1640 */ 1641 void 1642 in_delmulti(struct in_multi *inm) 1643 { 1644 struct sockaddr_in sin; 1645 1646 rw_enter(&in_multilock, RW_WRITER); 1647 if (--inm->inm_refcount > 0) { 1648 rw_exit(&in_multilock); 1649 return; 1650 } 1651 1652 /* 1653 * No remaining claims to this record; let IGMP know that 1654 * we are leaving the multicast group. 1655 */ 1656 igmp_leavegroup(inm); 1657 1658 /* 1659 * Notify the network driver to update its multicast reception 1660 * filter. 1661 */ 1662 sockaddr_in_init(&sin, &inm->inm_addr, 0); 1663 if_mcast_op(inm->inm_ifp, SIOCDELMULTI, sintosa(&sin)); 1664 1665 /* 1666 * Unlink from list. 1667 */ 1668 LIST_REMOVE(inm, inm_list); 1669 in_multientries--; 1670 rw_exit(&in_multilock); 1671 1672 pool_put(&inmulti_pool, inm); 1673 } 1674 1675 /* 1676 * in_next_multi: step through all of the in_multi records, one at a time. 1677 * The current position is remembered in "step", which the caller must 1678 * provide. in_first_multi(), below, must be called to initialize "step" 1679 * and get the first record. Both macros return a NULL "inm" when there 1680 * are no remaining records. 1681 */ 1682 struct in_multi * 1683 in_next_multi(struct in_multistep *step) 1684 { 1685 struct in_multi *inm; 1686 1687 KASSERT(rw_lock_held(&in_multilock)); 1688 1689 while (step->i_inm == NULL && step->i_n < IN_MULTI_HASH_SIZE) { 1690 step->i_inm = LIST_FIRST(&in_multihashtbl[++step->i_n]); 1691 } 1692 if ((inm = step->i_inm) != NULL) { 1693 step->i_inm = LIST_NEXT(inm, inm_list); 1694 } 1695 return inm; 1696 } 1697 1698 struct in_multi * 1699 in_first_multi(struct in_multistep *step) 1700 { 1701 KASSERT(rw_lock_held(&in_multilock)); 1702 1703 step->i_n = 0; 1704 step->i_inm = LIST_FIRST(&in_multihashtbl[0]); 1705 return in_next_multi(step); 1706 } 1707 1708 void 1709 in_multi_lock(int op) 1710 { 1711 rw_enter(&in_multilock, op); 1712 } 1713 1714 void 1715 in_multi_unlock(void) 1716 { 1717 rw_exit(&in_multilock); 1718 } 1719 1720 int 1721 in_multi_lock_held(void) 1722 { 1723 return rw_lock_held(&in_multilock); 1724 } 1725 1726 struct in_ifaddr * 1727 in_selectsrc(struct sockaddr_in *sin, struct route *ro, 1728 int soopts, struct ip_moptions *mopts, int *errorp, struct psref *psref) 1729 { 1730 struct rtentry *rt = NULL; 1731 struct in_ifaddr *ia = NULL; 1732 1733 KASSERT(ISSET(curlwp->l_pflag, LP_BOUND)); 1734 /* 1735 * If route is known or can be allocated now, take the 1736 * source address from the interface. Otherwise, punt. 1737 */ 1738 if ((soopts & SO_DONTROUTE) != 0) 1739 rtcache_free(ro); 1740 else { 1741 union { 1742 struct sockaddr dst; 1743 struct sockaddr_in dst4; 1744 } u; 1745 1746 sockaddr_in_init(&u.dst4, &sin->sin_addr, 0); 1747 rt = rtcache_lookup(ro, &u.dst); 1748 } 1749 /* 1750 * If we found a route, use the address 1751 * corresponding to the outgoing interface 1752 * unless it is the loopback (in case a route 1753 * to our address on another net goes to loopback). 1754 * 1755 * XXX Is this still true? Do we care? 1756 */ 1757 if (rt != NULL && (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) { 1758 int s; 1759 struct ifaddr *ifa; 1760 /* 1761 * Just in case. May not need to do this workaround. 1762 * Revisit when working on rtentry MP-ification. 1763 */ 1764 s = pserialize_read_enter(); 1765 IFADDR_READER_FOREACH(ifa, rt->rt_ifp) { 1766 if (ifa == rt->rt_ifa) 1767 break; 1768 } 1769 if (ifa != NULL) 1770 ifa_acquire(ifa, psref); 1771 pserialize_read_exit(s); 1772 1773 ia = ifatoia(ifa); 1774 } 1775 if (ia == NULL) { 1776 u_int16_t fport = sin->sin_port; 1777 struct ifaddr *ifa; 1778 int s; 1779 1780 sin->sin_port = 0; 1781 ifa = ifa_ifwithladdr_psref(sintosa(sin), psref); 1782 sin->sin_port = fport; 1783 if (ifa == NULL) { 1784 /* Find 1st non-loopback AF_INET address */ 1785 s = pserialize_read_enter(); 1786 IN_ADDRLIST_READER_FOREACH(ia) { 1787 if (!(ia->ia_ifp->if_flags & IFF_LOOPBACK)) 1788 break; 1789 } 1790 if (ia != NULL) 1791 ia4_acquire(ia, psref); 1792 pserialize_read_exit(s); 1793 } else { 1794 /* ia is already referenced by psref */ 1795 ia = ifatoia(ifa); 1796 } 1797 if (ia == NULL) { 1798 *errorp = EADDRNOTAVAIL; 1799 goto out; 1800 } 1801 } 1802 /* 1803 * If the destination address is multicast and an outgoing 1804 * interface has been set as a multicast option, use the 1805 * address of that interface as our source address. 1806 */ 1807 if (IN_MULTICAST(sin->sin_addr.s_addr) && mopts != NULL) { 1808 struct ip_moptions *imo; 1809 1810 imo = mopts; 1811 if (imo->imo_multicast_if_index != 0) { 1812 struct ifnet *ifp; 1813 int s; 1814 1815 if (ia != NULL) 1816 ia4_release(ia, psref); 1817 s = pserialize_read_enter(); 1818 ifp = if_byindex(imo->imo_multicast_if_index); 1819 if (ifp != NULL) { 1820 /* XXX */ 1821 ia = in_get_ia_from_ifp_psref(ifp, psref); 1822 } else 1823 ia = NULL; 1824 if (ia == NULL || ia->ia4_flags & IN_IFF_NOTREADY) { 1825 pserialize_read_exit(s); 1826 if (ia != NULL) 1827 ia4_release(ia, psref); 1828 *errorp = EADDRNOTAVAIL; 1829 ia = NULL; 1830 goto out; 1831 } 1832 pserialize_read_exit(s); 1833 } 1834 } 1835 if (ia->ia_ifa.ifa_getifa != NULL) { 1836 ia = ifatoia((*ia->ia_ifa.ifa_getifa)(&ia->ia_ifa, 1837 sintosa(sin))); 1838 if (ia == NULL) { 1839 *errorp = EADDRNOTAVAIL; 1840 goto out; 1841 } 1842 /* FIXME NOMPSAFE */ 1843 ia4_acquire(ia, psref); 1844 } 1845 #ifdef GETIFA_DEBUG 1846 else 1847 printf("%s: missing ifa_getifa\n", __func__); 1848 #endif 1849 out: 1850 rtcache_unref(rt, ro); 1851 return ia; 1852 } 1853 1854 #if NARP > 0 1855 1856 struct in_llentry { 1857 struct llentry base; 1858 }; 1859 1860 #define IN_LLTBL_DEFAULT_HSIZE 32 1861 #define IN_LLTBL_HASH(k, h) \ 1862 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 1863 1864 /* 1865 * Do actual deallocation of @lle. 1866 * Called by LLE_FREE_LOCKED when number of references 1867 * drops to zero. 1868 */ 1869 static void 1870 in_lltable_destroy_lle(struct llentry *lle) 1871 { 1872 1873 LLE_WUNLOCK(lle); 1874 LLE_LOCK_DESTROY(lle); 1875 kmem_intr_free(lle, sizeof(*lle)); 1876 } 1877 1878 static struct llentry * 1879 in_lltable_new(struct in_addr addr4, u_int flags) 1880 { 1881 struct in_llentry *lle; 1882 1883 lle = kmem_intr_zalloc(sizeof(*lle), KM_NOSLEEP); 1884 if (lle == NULL) /* NB: caller generates msg */ 1885 return NULL; 1886 1887 /* 1888 * For IPv4 this will trigger "arpresolve" to generate 1889 * an ARP request. 1890 */ 1891 lle->base.la_expire = time_uptime; /* mark expired */ 1892 lle->base.r_l3addr.addr4 = addr4; 1893 lle->base.lle_refcnt = 1; 1894 lle->base.lle_free = in_lltable_destroy_lle; 1895 LLE_LOCK_INIT(&lle->base); 1896 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1897 1898 return (&lle->base); 1899 } 1900 1901 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1902 (((ntohl((d).s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1903 1904 static int 1905 in_lltable_match_prefix(const struct sockaddr *prefix, 1906 const struct sockaddr *mask, u_int flags, struct llentry *lle) 1907 { 1908 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1909 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1910 1911 /* 1912 * (flags & LLE_STATIC) means deleting all entries 1913 * including static ARP entries. 1914 */ 1915 if (IN_ARE_MASKED_ADDR_EQUAL(lle->r_l3addr.addr4, pfx, msk) && 1916 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 1917 return (1); 1918 1919 return (0); 1920 } 1921 1922 static void 1923 in_lltable_free_entry(struct lltable *llt, struct llentry *lle) 1924 { 1925 struct ifnet *ifp __diagused; 1926 size_t pkts_dropped; 1927 1928 LLE_WLOCK_ASSERT(lle); 1929 KASSERT(llt != NULL); 1930 1931 /* Unlink entry from table if not already */ 1932 if ((lle->la_flags & LLE_LINKED) != 0) { 1933 ifp = llt->llt_ifp; 1934 IF_AFDATA_WLOCK_ASSERT(ifp); 1935 lltable_unlink_entry(llt, lle); 1936 } 1937 1938 /* cancel timer */ 1939 if (callout_halt(&lle->lle_timer, &lle->lle_lock)) 1940 LLE_REMREF(lle); 1941 1942 /* Drop hold queue */ 1943 pkts_dropped = llentry_free(lle); 1944 arp_stat_add(ARP_STAT_DFRDROPPED, (uint64_t)pkts_dropped); 1945 } 1946 1947 static int 1948 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1949 { 1950 struct rtentry *rt; 1951 int error = EINVAL; 1952 1953 KASSERTMSG(l3addr->sa_family == AF_INET, 1954 "sin_family %d", l3addr->sa_family); 1955 1956 rt = rtalloc1(l3addr, 0); 1957 if (rt == NULL) 1958 return error; 1959 1960 /* 1961 * If the gateway for an existing host route matches the target L3 1962 * address, which is a special route inserted by some implementation 1963 * such as MANET, and the interface is of the correct type, then 1964 * allow for ARP to proceed. 1965 */ 1966 if (rt->rt_flags & RTF_GATEWAY) { 1967 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1968 rt->rt_ifp->if_type != IFT_ETHER || 1969 #ifdef __FreeBSD__ 1970 (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1971 #else 1972 (rt->rt_ifp->if_flags & IFF_NOARP) != 0 || 1973 #endif 1974 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1975 sizeof(in_addr_t)) != 0) { 1976 goto error; 1977 } 1978 } 1979 1980 /* 1981 * Make sure that at least the destination address is covered 1982 * by the route. This is for handling the case where 2 or more 1983 * interfaces have the same prefix. An incoming packet arrives 1984 * on one interface and the corresponding outgoing packet leaves 1985 * another interface. 1986 */ 1987 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1988 const char *sa, *mask, *addr, *lim; 1989 int len; 1990 1991 mask = (const char *)rt_mask(rt); 1992 /* 1993 * Just being extra cautious to avoid some custom 1994 * code getting into trouble. 1995 */ 1996 if (mask == NULL) 1997 goto error; 1998 1999 sa = (const char *)rt_getkey(rt); 2000 addr = (const char *)l3addr; 2001 len = ((const struct sockaddr_in *)l3addr)->sin_len; 2002 lim = addr + len; 2003 2004 for ( ; addr < lim; sa++, mask++, addr++) { 2005 if ((*sa ^ *addr) & *mask) { 2006 #ifdef DIAGNOSTIC 2007 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 2008 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 2009 #endif 2010 goto error; 2011 } 2012 } 2013 } 2014 2015 error = 0; 2016 error: 2017 rt_unref(rt); 2018 return error; 2019 } 2020 2021 static inline uint32_t 2022 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize) 2023 { 2024 2025 return (IN_LLTBL_HASH(dst.s_addr, hsize)); 2026 } 2027 2028 static uint32_t 2029 in_lltable_hash(const struct llentry *lle, uint32_t hsize) 2030 { 2031 2032 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize)); 2033 } 2034 2035 static void 2036 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2037 { 2038 struct sockaddr_in *sin; 2039 2040 sin = (struct sockaddr_in *)sa; 2041 memset(sin, 0, sizeof(*sin)); 2042 sin->sin_family = AF_INET; 2043 sin->sin_len = sizeof(*sin); 2044 sin->sin_addr = lle->r_l3addr.addr4; 2045 } 2046 2047 static inline struct llentry * 2048 in_lltable_find_dst(struct lltable *llt, struct in_addr dst) 2049 { 2050 struct llentry *lle; 2051 struct llentries *lleh; 2052 u_int hashidx; 2053 2054 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize); 2055 lleh = &llt->lle_head[hashidx]; 2056 LIST_FOREACH(lle, lleh, lle_next) { 2057 if (lle->la_flags & LLE_DELETED) 2058 continue; 2059 if (lle->r_l3addr.addr4.s_addr == dst.s_addr) 2060 break; 2061 } 2062 2063 return (lle); 2064 } 2065 2066 static int 2067 in_lltable_delete(struct lltable *llt, u_int flags, 2068 const struct sockaddr *l3addr) 2069 { 2070 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 2071 struct ifnet *ifp __diagused = llt->llt_ifp; 2072 struct llentry *lle; 2073 2074 IF_AFDATA_WLOCK_ASSERT(ifp); 2075 KASSERTMSG(l3addr->sa_family == AF_INET, 2076 "sin_family %d", l3addr->sa_family); 2077 2078 lle = in_lltable_find_dst(llt, sin->sin_addr); 2079 if (lle == NULL) { 2080 #ifdef DIAGNOSTIC 2081 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 2082 #endif 2083 return (ENOENT); 2084 } 2085 2086 LLE_WLOCK(lle); 2087 lle->la_flags |= LLE_DELETED; 2088 #ifdef DIAGNOSTIC 2089 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2090 #endif 2091 if ((lle->la_flags & (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2092 llentry_free(lle); 2093 else 2094 LLE_WUNLOCK(lle); 2095 2096 return (0); 2097 } 2098 2099 static struct llentry * 2100 in_lltable_create(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 2101 { 2102 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 2103 struct ifnet *ifp = llt->llt_ifp; 2104 struct llentry *lle; 2105 2106 IF_AFDATA_WLOCK_ASSERT(ifp); 2107 KASSERTMSG(l3addr->sa_family == AF_INET, 2108 "sin_family %d", l3addr->sa_family); 2109 2110 lle = in_lltable_find_dst(llt, sin->sin_addr); 2111 2112 if (lle != NULL) { 2113 LLE_WLOCK(lle); 2114 return (lle); 2115 } 2116 2117 /* no existing record, we need to create new one */ 2118 2119 /* 2120 * A route that covers the given address must have 2121 * been installed 1st because we are doing a resolution, 2122 * verify this. 2123 */ 2124 if (!(flags & LLE_IFADDR) && 2125 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 2126 return (NULL); 2127 2128 lle = in_lltable_new(sin->sin_addr, flags); 2129 if (lle == NULL) { 2130 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2131 return (NULL); 2132 } 2133 lle->la_flags = flags; 2134 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2135 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2136 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2137 } 2138 2139 lltable_link_entry(llt, lle); 2140 LLE_WLOCK(lle); 2141 2142 return (lle); 2143 } 2144 2145 /* 2146 * Return NULL if not found or marked for deletion. 2147 * If found return lle read locked. 2148 */ 2149 static struct llentry * 2150 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 2151 { 2152 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 2153 struct llentry *lle; 2154 2155 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2156 KASSERTMSG(l3addr->sa_family == AF_INET, 2157 "sin_family %d", l3addr->sa_family); 2158 2159 lle = in_lltable_find_dst(llt, sin->sin_addr); 2160 2161 if (lle == NULL) 2162 return NULL; 2163 2164 if (flags & LLE_EXCLUSIVE) 2165 LLE_WLOCK(lle); 2166 else 2167 LLE_RLOCK(lle); 2168 2169 return lle; 2170 } 2171 2172 static int 2173 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2174 struct rt_walkarg *w) 2175 { 2176 struct sockaddr_in sin; 2177 2178 LLTABLE_LOCK_ASSERT(); 2179 2180 /* skip deleted entries */ 2181 if (lle->la_flags & LLE_DELETED) 2182 return 0; 2183 2184 sockaddr_in_init(&sin, &lle->r_l3addr.addr4, 0); 2185 2186 return lltable_dump_entry(llt, lle, w, sintosa(&sin)); 2187 } 2188 2189 #endif /* NARP > 0 */ 2190 2191 static int 2192 in_multicast_sysctl(SYSCTLFN_ARGS) 2193 { 2194 struct ifnet *ifp; 2195 struct ifaddr *ifa; 2196 struct in_ifaddr *ifa4; 2197 struct in_multi *inm; 2198 uint32_t tmp; 2199 int error; 2200 size_t written; 2201 struct psref psref; 2202 int bound; 2203 2204 if (namelen != 1) 2205 return EINVAL; 2206 2207 bound = curlwp_bind(); 2208 ifp = if_get_byindex(name[0], &psref); 2209 if (ifp == NULL) { 2210 curlwp_bindx(bound); 2211 return ENODEV; 2212 } 2213 2214 if (oldp == NULL) { 2215 *oldlenp = 0; 2216 IFADDR_FOREACH(ifa, ifp) { 2217 if (ifa->ifa_addr->sa_family != AF_INET) 2218 continue; 2219 ifa4 = (void *)ifa; 2220 LIST_FOREACH(inm, &ifa4->ia_multiaddrs, inm_list) { 2221 *oldlenp += 2 * sizeof(struct in_addr) + 2222 sizeof(uint32_t); 2223 } 2224 } 2225 if_put(ifp, &psref); 2226 curlwp_bindx(bound); 2227 return 0; 2228 } 2229 2230 error = 0; 2231 written = 0; 2232 IFADDR_FOREACH(ifa, ifp) { 2233 if (ifa->ifa_addr->sa_family != AF_INET) 2234 continue; 2235 ifa4 = (void *)ifa; 2236 LIST_FOREACH(inm, &ifa4->ia_multiaddrs, inm_list) { 2237 if (written + 2 * sizeof(struct in_addr) + 2238 sizeof(uint32_t) > *oldlenp) 2239 goto done; 2240 error = sysctl_copyout(l, &ifa4->ia_addr.sin_addr, 2241 oldp, sizeof(struct in_addr)); 2242 if (error) 2243 goto done; 2244 oldp = (char *)oldp + sizeof(struct in_addr); 2245 written += sizeof(struct in_addr); 2246 error = sysctl_copyout(l, &inm->inm_addr, 2247 oldp, sizeof(struct in_addr)); 2248 if (error) 2249 goto done; 2250 oldp = (char *)oldp + sizeof(struct in_addr); 2251 written += sizeof(struct in_addr); 2252 tmp = inm->inm_refcount; 2253 error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp)); 2254 if (error) 2255 goto done; 2256 oldp = (char *)oldp + sizeof(tmp); 2257 written += sizeof(tmp); 2258 } 2259 } 2260 done: 2261 if_put(ifp, &psref); 2262 curlwp_bindx(bound); 2263 *oldlenp = written; 2264 return error; 2265 } 2266 2267 static void 2268 in_sysctl_init(struct sysctllog **clog) 2269 { 2270 sysctl_createv(clog, 0, NULL, NULL, 2271 CTLFLAG_PERMANENT, 2272 CTLTYPE_NODE, "inet", 2273 SYSCTL_DESCR("PF_INET related settings"), 2274 NULL, 0, NULL, 0, 2275 CTL_NET, PF_INET, CTL_EOL); 2276 sysctl_createv(clog, 0, NULL, NULL, 2277 CTLFLAG_PERMANENT, 2278 CTLTYPE_NODE, "multicast", 2279 SYSCTL_DESCR("Multicast information"), 2280 in_multicast_sysctl, 0, NULL, 0, 2281 CTL_NET, PF_INET, CTL_CREATE, CTL_EOL); 2282 sysctl_createv(clog, 0, NULL, NULL, 2283 CTLFLAG_PERMANENT, 2284 CTLTYPE_NODE, "ip", 2285 SYSCTL_DESCR("IPv4 related settings"), 2286 NULL, 0, NULL, 0, 2287 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 2288 2289 sysctl_createv(clog, 0, NULL, NULL, 2290 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2291 CTLTYPE_INT, "subnetsarelocal", 2292 SYSCTL_DESCR("Whether logical subnets are considered " 2293 "local"), 2294 NULL, 0, &subnetsarelocal, 0, 2295 CTL_NET, PF_INET, IPPROTO_IP, 2296 IPCTL_SUBNETSARELOCAL, CTL_EOL); 2297 sysctl_createv(clog, 0, NULL, NULL, 2298 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2299 CTLTYPE_INT, "hostzerobroadcast", 2300 SYSCTL_DESCR("All zeroes address is broadcast address"), 2301 NULL, 0, &hostzeroisbroadcast, 0, 2302 CTL_NET, PF_INET, IPPROTO_IP, 2303 IPCTL_HOSTZEROBROADCAST, CTL_EOL); 2304 } 2305 2306 #if NARP > 0 2307 2308 static struct lltable * 2309 in_lltattach(struct ifnet *ifp) 2310 { 2311 struct lltable *llt; 2312 2313 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE); 2314 llt->llt_af = AF_INET; 2315 llt->llt_ifp = ifp; 2316 2317 llt->llt_lookup = in_lltable_lookup; 2318 llt->llt_create = in_lltable_create; 2319 llt->llt_delete = in_lltable_delete; 2320 llt->llt_dump_entry = in_lltable_dump_entry; 2321 llt->llt_hash = in_lltable_hash; 2322 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry; 2323 llt->llt_free_entry = in_lltable_free_entry; 2324 llt->llt_match_prefix = in_lltable_match_prefix; 2325 lltable_link(llt); 2326 2327 return (llt); 2328 } 2329 2330 #endif /* NARP > 0 */ 2331 2332 void * 2333 in_domifattach(struct ifnet *ifp) 2334 { 2335 struct in_ifinfo *ii; 2336 2337 ii = kmem_zalloc(sizeof(struct in_ifinfo), KM_SLEEP); 2338 KASSERT(ii != NULL); 2339 2340 #if NARP > 0 2341 ii->ii_llt = in_lltattach(ifp); 2342 #endif 2343 2344 #ifdef IPSELSRC 2345 ii->ii_selsrc = in_selsrc_domifattach(ifp); 2346 KASSERT(ii->ii_selsrc != NULL); 2347 #endif 2348 2349 return ii; 2350 } 2351 2352 void 2353 in_domifdetach(struct ifnet *ifp, void *aux) 2354 { 2355 struct in_ifinfo *ii = aux; 2356 2357 #ifdef IPSELSRC 2358 in_selsrc_domifdetach(ifp, ii->ii_selsrc); 2359 #endif 2360 #if NARP > 0 2361 lltable_free(ii->ii_llt); 2362 #endif 2363 kmem_free(ii, sizeof(struct in_ifinfo)); 2364 } 2365
Indexes created Tue Sep 23 14:10:03 GMT 2025