Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/scope6.c
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1 /*- 2 * Copyright (C) 2000 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $ 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/11.2/sys/netinet6/scope6.c 331722 2018-03-29 02:50:57Z eadler $"); 34 35 #include <sys/param.h> 36 #include <sys/malloc.h> 37 #include <sys/mbuf.h> 38 #include <sys/socket.h> 39 #include <sys/sockio.h> 40 #include <sys/systm.h> 41 #include <sys/queue.h> 42 #include <sys/sysctl.h> 43 #include <sys/syslog.h> 44 45 #include <net/if.h> 46 #include <net/if_var.h> 47 #include <net/vnet.h> 48 49 #include <netinet/in.h> 50 51 #include <netinet/ip6.h> 52 #include <netinet6/in6_var.h> 53 #include <netinet6/ip6_var.h> 54 #include <netinet6/scope6_var.h> 55 56 #ifdef ENABLE_DEFAULT_SCOPE 57 VNET_DEFINE(int, ip6_use_defzone) = 1; 58 #else 59 VNET_DEFINE(int, ip6_use_defzone) = 0; 60 #endif 61 VNET_DEFINE(int, deembed_scopeid) = 1; 62 SYSCTL_DECL(_net_inet6_ip6); 63 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, deembed_scopeid, CTLFLAG_VNET | CTLFLAG_RW, 64 &VNET_NAME(deembed_scopeid), 0, 65 "Extract embedded zone ID and set it to sin6_scope_id in sockaddr_in6."); 66 67 /* 68 * The scope6_lock protects the global sid default stored in 69 * sid_default below. 70 */ 71 static struct mtx scope6_lock; 72 #define SCOPE6_LOCK_INIT() mtx_init(&scope6_lock, "scope6_lock", NULL, MTX_DEF) 73 #define SCOPE6_LOCK() mtx_lock(&scope6_lock) 74 #define SCOPE6_UNLOCK() mtx_unlock(&scope6_lock) 75 #define SCOPE6_LOCK_ASSERT() mtx_assert(&scope6_lock, MA_OWNED) 76 77 static VNET_DEFINE(struct scope6_id, sid_default); 78 #define V_sid_default VNET(sid_default) 79 80 #define SID(ifp) \ 81 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id) 82 83 static int scope6_get(struct ifnet *, struct scope6_id *); 84 static int scope6_set(struct ifnet *, struct scope6_id *); 85 86 void 87 scope6_init(void) 88 { 89 90 bzero(&V_sid_default, sizeof(V_sid_default)); 91 92 if (!IS_DEFAULT_VNET(curvnet)) 93 return; 94 95 SCOPE6_LOCK_INIT(); 96 } 97 98 struct scope6_id * 99 scope6_ifattach(struct ifnet *ifp) 100 { 101 struct scope6_id *sid; 102 103 sid = malloc(sizeof(*sid), M_IFADDR, M_WAITOK | M_ZERO); 104 /* 105 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard. 106 * Should we rather hardcode here? 107 */ 108 sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index; 109 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index; 110 return (sid); 111 } 112 113 void 114 scope6_ifdetach(struct scope6_id *sid) 115 { 116 117 free(sid, M_IFADDR); 118 } 119 120 int 121 scope6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 122 { 123 struct in6_ifreq *ifr; 124 125 if (ifp->if_afdata[AF_INET6] == NULL) 126 return (EPFNOSUPPORT); 127 128 ifr = (struct in6_ifreq *)data; 129 switch (cmd) { 130 case SIOCSSCOPE6: 131 return (scope6_set(ifp, 132 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 133 case SIOCGSCOPE6: 134 return (scope6_get(ifp, 135 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 136 case SIOCGSCOPE6DEF: 137 return (scope6_get_default( 138 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 139 default: 140 return (EOPNOTSUPP); 141 } 142 } 143 144 static int 145 scope6_set(struct ifnet *ifp, struct scope6_id *idlist) 146 { 147 int i; 148 int error = 0; 149 struct scope6_id *sid = NULL; 150 151 IF_AFDATA_WLOCK(ifp); 152 sid = SID(ifp); 153 154 if (!sid) { /* paranoid? */ 155 IF_AFDATA_WUNLOCK(ifp); 156 return (EINVAL); 157 } 158 159 /* 160 * XXX: We need more consistency checks of the relationship among 161 * scopes (e.g. an organization should be larger than a site). 162 */ 163 164 /* 165 * TODO(XXX): after setting, we should reflect the changes to 166 * interface addresses, routing table entries, PCB entries... 167 */ 168 169 for (i = 0; i < 16; i++) { 170 if (idlist->s6id_list[i] && 171 idlist->s6id_list[i] != sid->s6id_list[i]) { 172 /* 173 * An interface zone ID must be the corresponding 174 * interface index by definition. 175 */ 176 if (i == IPV6_ADDR_SCOPE_INTFACELOCAL && 177 idlist->s6id_list[i] != ifp->if_index) { 178 IF_AFDATA_WUNLOCK(ifp); 179 return (EINVAL); 180 } 181 182 if (i == IPV6_ADDR_SCOPE_LINKLOCAL && 183 idlist->s6id_list[i] > V_if_index) { 184 /* 185 * XXX: theoretically, there should be no 186 * relationship between link IDs and interface 187 * IDs, but we check the consistency for 188 * safety in later use. 189 */ 190 IF_AFDATA_WUNLOCK(ifp); 191 return (EINVAL); 192 } 193 194 /* 195 * XXX: we must need lots of work in this case, 196 * but we simply set the new value in this initial 197 * implementation. 198 */ 199 sid->s6id_list[i] = idlist->s6id_list[i]; 200 } 201 } 202 IF_AFDATA_WUNLOCK(ifp); 203 204 return (error); 205 } 206 207 static int 208 scope6_get(struct ifnet *ifp, struct scope6_id *idlist) 209 { 210 struct scope6_id *sid; 211 212 /* We only need to lock the interface's afdata for SID() to work. */ 213 IF_AFDATA_RLOCK(ifp); 214 sid = SID(ifp); 215 if (sid == NULL) { /* paranoid? */ 216 IF_AFDATA_RUNLOCK(ifp); 217 return (EINVAL); 218 } 219 220 *idlist = *sid; 221 222 IF_AFDATA_RUNLOCK(ifp); 223 return (0); 224 } 225 226 /* 227 * Get a scope of the address. Node-local, link-local, site-local or global. 228 */ 229 int 230 in6_addrscope(const struct in6_addr *addr) 231 { 232 233 if (IN6_IS_ADDR_MULTICAST(addr)) { 234 /* 235 * Addresses with reserved value F must be treated as 236 * global multicast addresses. 237 */ 238 if (IPV6_ADDR_MC_SCOPE(addr) == 0x0f) 239 return (IPV6_ADDR_SCOPE_GLOBAL); 240 return (IPV6_ADDR_MC_SCOPE(addr)); 241 } 242 if (IN6_IS_ADDR_LINKLOCAL(addr) || 243 IN6_IS_ADDR_LOOPBACK(addr)) 244 return (IPV6_ADDR_SCOPE_LINKLOCAL); 245 if (IN6_IS_ADDR_SITELOCAL(addr)) 246 return (IPV6_ADDR_SCOPE_SITELOCAL); 247 return (IPV6_ADDR_SCOPE_GLOBAL); 248 } 249 250 /* 251 * ifp - note that this might be NULL 252 */ 253 254 void 255 scope6_setdefault(struct ifnet *ifp) 256 { 257 258 /* 259 * Currently, this function just sets the default "interfaces" 260 * and "links" according to the given interface. 261 * We might eventually have to separate the notion of "link" from 262 * "interface" and provide a user interface to set the default. 263 */ 264 SCOPE6_LOCK(); 265 if (ifp) { 266 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 267 ifp->if_index; 268 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 269 ifp->if_index; 270 } else { 271 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0; 272 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0; 273 } 274 SCOPE6_UNLOCK(); 275 } 276 277 int 278 scope6_get_default(struct scope6_id *idlist) 279 { 280 281 SCOPE6_LOCK(); 282 *idlist = V_sid_default; 283 SCOPE6_UNLOCK(); 284 285 return (0); 286 } 287 288 u_int32_t 289 scope6_addr2default(struct in6_addr *addr) 290 { 291 u_int32_t id; 292 293 /* 294 * special case: The loopback address should be considered as 295 * link-local, but there's no ambiguity in the syntax. 296 */ 297 if (IN6_IS_ADDR_LOOPBACK(addr)) 298 return (0); 299 300 /* 301 * XXX: 32-bit read is atomic on all our platforms, is it OK 302 * not to lock here? 303 */ 304 SCOPE6_LOCK(); 305 id = V_sid_default.s6id_list[in6_addrscope(addr)]; 306 SCOPE6_UNLOCK(); 307 return (id); 308 } 309 310 /* 311 * Validate the specified scope zone ID in the sin6_scope_id field. If the ID 312 * is unspecified (=0), needs to be specified, and the default zone ID can be 313 * used, the default value will be used. 314 * This routine then generates the kernel-internal form: if the address scope 315 * of is interface-local or link-local, embed the interface index in the 316 * address. 317 */ 318 int 319 sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok) 320 { 321 u_int32_t zoneid; 322 323 if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok) 324 zoneid = scope6_addr2default(&sin6->sin6_addr); 325 326 if (zoneid != 0 && 327 (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 328 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) { 329 /* 330 * At this moment, we only check interface-local and 331 * link-local scope IDs, and use interface indices as the 332 * zone IDs assuming a one-to-one mapping between interfaces 333 * and links. 334 */ 335 if (V_if_index < zoneid || ifnet_byindex(zoneid) == NULL) 336 return (ENXIO); 337 338 /* XXX assignment to 16bit from 32bit variable */ 339 sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff); 340 sin6->sin6_scope_id = 0; 341 } 342 343 return 0; 344 } 345 346 /* 347 * generate standard sockaddr_in6 from embedded form. 348 */ 349 int 350 sa6_recoverscope(struct sockaddr_in6 *sin6) 351 { 352 char ip6buf[INET6_ADDRSTRLEN]; 353 u_int32_t zoneid; 354 355 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 356 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) { 357 /* 358 * KAME assumption: link id == interface id 359 */ 360 zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]); 361 if (zoneid) { 362 /* sanity check */ 363 if (V_if_index < zoneid) 364 return (ENXIO); 365 #if 0 366 /* XXX: Disabled due to possible deadlock. */ 367 if (!ifnet_byindex(zoneid)) 368 return (ENXIO); 369 #endif 370 if (sin6->sin6_scope_id != 0 && 371 zoneid != sin6->sin6_scope_id) { 372 log(LOG_NOTICE, 373 "%s: embedded scope mismatch: %s%%%d. " 374 "sin6_scope_id was overridden\n", __func__, 375 ip6_sprintf(ip6buf, &sin6->sin6_addr), 376 sin6->sin6_scope_id); 377 } 378 sin6->sin6_addr.s6_addr16[1] = 0; 379 sin6->sin6_scope_id = zoneid; 380 } 381 } 382 383 return 0; 384 } 385 386 /* 387 * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is 388 * non NULL, it is set to the zone ID. If the zone ID needs to be embedded 389 * in the in6_addr structure, in6 will be modified. 390 * 391 * ret_id - unnecessary? 392 */ 393 int 394 in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id) 395 { 396 int scope; 397 u_int32_t zoneid = 0; 398 struct scope6_id *sid; 399 400 /* 401 * special case: the loopback address can only belong to a loopback 402 * interface. 403 */ 404 if (IN6_IS_ADDR_LOOPBACK(in6)) { 405 if (!(ifp->if_flags & IFF_LOOPBACK)) 406 return (EINVAL); 407 } else { 408 scope = in6_addrscope(in6); 409 if (scope == IPV6_ADDR_SCOPE_INTFACELOCAL || 410 scope == IPV6_ADDR_SCOPE_LINKLOCAL) { 411 /* 412 * Currently we use interface indices as the 413 * zone IDs for interface-local and link-local 414 * scopes. 415 */ 416 zoneid = ifp->if_index; 417 in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */ 418 } else if (scope != IPV6_ADDR_SCOPE_GLOBAL) { 419 IF_AFDATA_RLOCK(ifp); 420 sid = SID(ifp); 421 zoneid = sid->s6id_list[scope]; 422 IF_AFDATA_RUNLOCK(ifp); 423 } 424 } 425 426 if (ret_id != NULL) 427 *ret_id = zoneid; 428 429 return (0); 430 } 431 432 /* 433 * Just clear the embedded scope identifier. Return 0 if the original address 434 * is intact; return non 0 if the address is modified. 435 */ 436 int 437 in6_clearscope(struct in6_addr *in6) 438 { 439 int modified = 0; 440 441 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) { 442 if (in6->s6_addr16[1] != 0) 443 modified = 1; 444 in6->s6_addr16[1] = 0; 445 } 446 447 return (modified); 448 } 449 450 /* 451 * Return the scope identifier or zero. 452 */ 453 uint16_t 454 in6_getscope(struct in6_addr *in6) 455 { 456 457 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) 458 return (in6->s6_addr16[1]); 459 460 return (0); 461 } 462 463 /* 464 * Return pointer to ifnet structure, corresponding to the zone id of 465 * link-local scope. 466 */ 467 struct ifnet* 468 in6_getlinkifnet(uint32_t zoneid) 469 { 470 471 return (ifnet_byindex((u_short)zoneid)); 472 } 473 474 /* 475 * Return zone id for the specified scope. 476 */ 477 uint32_t 478 in6_getscopezone(const struct ifnet *ifp, int scope) 479 { 480 481 if (scope == IPV6_ADDR_SCOPE_INTFACELOCAL || 482 scope == IPV6_ADDR_SCOPE_LINKLOCAL) 483 return (ifp->if_index); 484 if (scope >= 0 && scope < IPV6_ADDR_SCOPES_COUNT) 485 return (SID(ifp)->s6id_list[scope]); 486 return (0); 487 } 488 489 /* 490 * Extracts scope from adddress @dst, stores cleared address 491 * inside @dst and zone inside @scopeid 492 */ 493 void 494 in6_splitscope(const struct in6_addr *src, struct in6_addr *dst, 495 uint32_t *scopeid) 496 { 497 uint32_t zoneid; 498 499 *dst = *src; 500 zoneid = ntohs(in6_getscope(dst)); 501 in6_clearscope(dst); 502 *scopeid = zoneid; 503 } 504 505 /* 506 * This function is for checking sockaddr_in6 structure passed 507 * from the application level (usually). 508 * 509 * sin6_scope_id should be set for link-local unicast, link-local and 510 * interface-local multicast addresses. 511 * 512 * If it is zero, then look into default zone ids. If default zone id is 513 * not set or disabled, then return error. 514 */ 515 int 516 sa6_checkzone(struct sockaddr_in6 *sa6) 517 { 518 int scope; 519 520 scope = in6_addrscope(&sa6->sin6_addr); 521 if (scope == IPV6_ADDR_SCOPE_GLOBAL) 522 return (sa6->sin6_scope_id ? EINVAL: 0); 523 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr) && 524 scope != IPV6_ADDR_SCOPE_LINKLOCAL && 525 scope != IPV6_ADDR_SCOPE_INTFACELOCAL) { 526 if (sa6->sin6_scope_id == 0 && V_ip6_use_defzone != 0) 527 sa6->sin6_scope_id = V_sid_default.s6id_list[scope]; 528 return (0); 529 } 530 /* 531 * Since ::1 address always configured on the lo0, we can 532 * automatically set its zone id, when it is not specified. 533 * Return error, when specified zone id doesn't match with 534 * actual value. 535 */ 536 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr)) { 537 if (sa6->sin6_scope_id == 0) 538 sa6->sin6_scope_id = in6_getscopezone(V_loif, scope); 539 else if (sa6->sin6_scope_id != in6_getscopezone(V_loif, scope)) 540 return (EADDRNOTAVAIL); 541 } 542 /* XXX: we can validate sin6_scope_id here */ 543 if (sa6->sin6_scope_id != 0) 544 return (0); 545 if (V_ip6_use_defzone != 0) 546 sa6->sin6_scope_id = V_sid_default.s6id_list[scope]; 547 /* Return error if we can't determine zone id */ 548 return (sa6->sin6_scope_id ? 0: EADDRNOTAVAIL); 549 } 550 551 /* 552 * This function is similar to sa6_checkzone, but it uses given ifp 553 * to initialize sin6_scope_id. 554 */ 555 int 556 sa6_checkzone_ifp(struct ifnet *ifp, struct sockaddr_in6 *sa6) 557 { 558 int scope; 559 560 scope = in6_addrscope(&sa6->sin6_addr); 561 if (scope == IPV6_ADDR_SCOPE_LINKLOCAL || 562 scope == IPV6_ADDR_SCOPE_INTFACELOCAL) { 563 if (sa6->sin6_scope_id == 0) { 564 sa6->sin6_scope_id = in6_getscopezone(ifp, scope); 565 return (0); 566 } else if (sa6->sin6_scope_id != in6_getscopezone(ifp, scope)) 567 return (EADDRNOTAVAIL); 568 } 569 return (sa6_checkzone(sa6)); 570 } 571 572
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