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/10.0/sys/netinet6/scope6.c 245244 2013-01-10 00:10:24Z ae $"); 34 35 #include <sys/param.h> 36 #include <sys/malloc.h> 37 #include <sys/mbuf.h> 38 #include <sys/socket.h> 39 #include <sys/systm.h> 40 #include <sys/queue.h> 41 #include <sys/sysctl.h> 42 #include <sys/syslog.h> 43 44 #include <net/if.h> 45 #include <net/vnet.h> 46 47 #include <netinet/in.h> 48 49 #include <netinet/ip6.h> 50 #include <netinet6/in6_var.h> 51 #include <netinet6/ip6_var.h> 52 #include <netinet6/scope6_var.h> 53 54 #ifdef ENABLE_DEFAULT_SCOPE 55 VNET_DEFINE(int, ip6_use_defzone) = 1; 56 #else 57 VNET_DEFINE(int, ip6_use_defzone) = 0; 58 #endif 59 VNET_DEFINE(int, deembed_scopeid) = 1; 60 SYSCTL_DECL(_net_inet6_ip6); 61 SYSCTL_VNET_INT(_net_inet6_ip6, OID_AUTO, deembed_scopeid, CTLFLAG_RW, 62 &VNET_NAME(deembed_scopeid), 0, 63 "Extract embedded zone ID and set it to sin6_scope_id in sockaddr_in6."); 64 65 /* 66 * The scope6_lock protects the global sid default stored in 67 * sid_default below. 68 */ 69 static struct mtx scope6_lock; 70 #define SCOPE6_LOCK_INIT() mtx_init(&scope6_lock, "scope6_lock", NULL, MTX_DEF) 71 #define SCOPE6_LOCK() mtx_lock(&scope6_lock) 72 #define SCOPE6_UNLOCK() mtx_unlock(&scope6_lock) 73 #define SCOPE6_LOCK_ASSERT() mtx_assert(&scope6_lock, MA_OWNED) 74 75 static VNET_DEFINE(struct scope6_id, sid_default); 76 #define V_sid_default VNET(sid_default) 77 78 #define SID(ifp) \ 79 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id) 80 81 void 82 scope6_init(void) 83 { 84 85 bzero(&V_sid_default, sizeof(V_sid_default)); 86 87 if (!IS_DEFAULT_VNET(curvnet)) 88 return; 89 90 SCOPE6_LOCK_INIT(); 91 } 92 93 struct scope6_id * 94 scope6_ifattach(struct ifnet *ifp) 95 { 96 struct scope6_id *sid; 97 98 sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK); 99 bzero(sid, sizeof(*sid)); 100 101 /* 102 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard. 103 * Should we rather hardcode here? 104 */ 105 sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index; 106 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index; 107 #ifdef MULTI_SCOPE 108 /* by default, we don't care about scope boundary for these scopes. */ 109 sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1; 110 sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1; 111 #endif 112 113 return sid; 114 } 115 116 void 117 scope6_ifdetach(struct scope6_id *sid) 118 { 119 120 free(sid, M_IFADDR); 121 } 122 123 int 124 scope6_set(struct ifnet *ifp, struct scope6_id *idlist) 125 { 126 int i; 127 int error = 0; 128 struct scope6_id *sid = NULL; 129 130 IF_AFDATA_WLOCK(ifp); 131 sid = SID(ifp); 132 133 if (!sid) { /* paranoid? */ 134 IF_AFDATA_WUNLOCK(ifp); 135 return (EINVAL); 136 } 137 138 /* 139 * XXX: We need more consistency checks of the relationship among 140 * scopes (e.g. an organization should be larger than a site). 141 */ 142 143 /* 144 * TODO(XXX): after setting, we should reflect the changes to 145 * interface addresses, routing table entries, PCB entries... 146 */ 147 148 for (i = 0; i < 16; i++) { 149 if (idlist->s6id_list[i] && 150 idlist->s6id_list[i] != sid->s6id_list[i]) { 151 /* 152 * An interface zone ID must be the corresponding 153 * interface index by definition. 154 */ 155 if (i == IPV6_ADDR_SCOPE_INTFACELOCAL && 156 idlist->s6id_list[i] != ifp->if_index) { 157 IF_AFDATA_WUNLOCK(ifp); 158 return (EINVAL); 159 } 160 161 if (i == IPV6_ADDR_SCOPE_LINKLOCAL && 162 idlist->s6id_list[i] > V_if_index) { 163 /* 164 * XXX: theoretically, there should be no 165 * relationship between link IDs and interface 166 * IDs, but we check the consistency for 167 * safety in later use. 168 */ 169 IF_AFDATA_WUNLOCK(ifp); 170 return (EINVAL); 171 } 172 173 /* 174 * XXX: we must need lots of work in this case, 175 * but we simply set the new value in this initial 176 * implementation. 177 */ 178 sid->s6id_list[i] = idlist->s6id_list[i]; 179 } 180 } 181 IF_AFDATA_WUNLOCK(ifp); 182 183 return (error); 184 } 185 186 int 187 scope6_get(struct ifnet *ifp, struct scope6_id *idlist) 188 { 189 struct scope6_id *sid; 190 191 /* We only need to lock the interface's afdata for SID() to work. */ 192 IF_AFDATA_RLOCK(ifp); 193 sid = SID(ifp); 194 if (sid == NULL) { /* paranoid? */ 195 IF_AFDATA_RUNLOCK(ifp); 196 return (EINVAL); 197 } 198 199 *idlist = *sid; 200 201 IF_AFDATA_RUNLOCK(ifp); 202 return (0); 203 } 204 205 206 /* 207 * Get a scope of the address. Node-local, link-local, site-local or global. 208 */ 209 int 210 in6_addrscope(struct in6_addr *addr) 211 { 212 int scope; 213 214 if (addr->s6_addr[0] == 0xfe) { 215 scope = addr->s6_addr[1] & 0xc0; 216 217 switch (scope) { 218 case 0x80: 219 return IPV6_ADDR_SCOPE_LINKLOCAL; 220 break; 221 case 0xc0: 222 return IPV6_ADDR_SCOPE_SITELOCAL; 223 break; 224 default: 225 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */ 226 break; 227 } 228 } 229 230 231 if (addr->s6_addr[0] == 0xff) { 232 scope = addr->s6_addr[1] & 0x0f; 233 234 /* 235 * due to other scope such as reserved, 236 * return scope doesn't work. 237 */ 238 switch (scope) { 239 case IPV6_ADDR_SCOPE_INTFACELOCAL: 240 return IPV6_ADDR_SCOPE_INTFACELOCAL; 241 break; 242 case IPV6_ADDR_SCOPE_LINKLOCAL: 243 return IPV6_ADDR_SCOPE_LINKLOCAL; 244 break; 245 case IPV6_ADDR_SCOPE_SITELOCAL: 246 return IPV6_ADDR_SCOPE_SITELOCAL; 247 break; 248 default: 249 return IPV6_ADDR_SCOPE_GLOBAL; 250 break; 251 } 252 } 253 254 /* 255 * Regard loopback and unspecified addresses as global, since 256 * they have no ambiguity. 257 */ 258 if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) { 259 if (addr->s6_addr[15] == 1) /* loopback */ 260 return IPV6_ADDR_SCOPE_LINKLOCAL; 261 if (addr->s6_addr[15] == 0) /* unspecified */ 262 return IPV6_ADDR_SCOPE_GLOBAL; /* XXX: correct? */ 263 } 264 265 return IPV6_ADDR_SCOPE_GLOBAL; 266 } 267 268 /* 269 * ifp - note that this might be NULL 270 */ 271 272 void 273 scope6_setdefault(struct ifnet *ifp) 274 { 275 276 /* 277 * Currently, this function just sets the default "interfaces" 278 * and "links" according to the given interface. 279 * We might eventually have to separate the notion of "link" from 280 * "interface" and provide a user interface to set the default. 281 */ 282 SCOPE6_LOCK(); 283 if (ifp) { 284 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 285 ifp->if_index; 286 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 287 ifp->if_index; 288 } else { 289 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0; 290 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0; 291 } 292 SCOPE6_UNLOCK(); 293 } 294 295 int 296 scope6_get_default(struct scope6_id *idlist) 297 { 298 299 SCOPE6_LOCK(); 300 *idlist = V_sid_default; 301 SCOPE6_UNLOCK(); 302 303 return (0); 304 } 305 306 u_int32_t 307 scope6_addr2default(struct in6_addr *addr) 308 { 309 u_int32_t id; 310 311 /* 312 * special case: The loopback address should be considered as 313 * link-local, but there's no ambiguity in the syntax. 314 */ 315 if (IN6_IS_ADDR_LOOPBACK(addr)) 316 return (0); 317 318 /* 319 * XXX: 32-bit read is atomic on all our platforms, is it OK 320 * not to lock here? 321 */ 322 SCOPE6_LOCK(); 323 id = V_sid_default.s6id_list[in6_addrscope(addr)]; 324 SCOPE6_UNLOCK(); 325 return (id); 326 } 327 328 /* 329 * Validate the specified scope zone ID in the sin6_scope_id field. If the ID 330 * is unspecified (=0), needs to be specified, and the default zone ID can be 331 * used, the default value will be used. 332 * This routine then generates the kernel-internal form: if the address scope 333 * of is interface-local or link-local, embed the interface index in the 334 * address. 335 */ 336 int 337 sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok) 338 { 339 u_int32_t zoneid; 340 341 if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok) 342 zoneid = scope6_addr2default(&sin6->sin6_addr); 343 344 if (zoneid != 0 && 345 (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 346 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) { 347 /* 348 * At this moment, we only check interface-local and 349 * link-local scope IDs, and use interface indices as the 350 * zone IDs assuming a one-to-one mapping between interfaces 351 * and links. 352 */ 353 if (V_if_index < zoneid || ifnet_byindex(zoneid) == NULL) 354 return (ENXIO); 355 356 /* XXX assignment to 16bit from 32bit variable */ 357 sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff); 358 sin6->sin6_scope_id = 0; 359 } 360 361 return 0; 362 } 363 364 /* 365 * generate standard sockaddr_in6 from embedded form. 366 */ 367 int 368 sa6_recoverscope(struct sockaddr_in6 *sin6) 369 { 370 char ip6buf[INET6_ADDRSTRLEN]; 371 u_int32_t zoneid; 372 373 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 374 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) { 375 /* 376 * KAME assumption: link id == interface id 377 */ 378 zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]); 379 if (zoneid) { 380 /* sanity check */ 381 if (V_if_index < zoneid) 382 return (ENXIO); 383 #if 0 384 /* XXX: Disabled due to possible deadlock. */ 385 if (!ifnet_byindex(zoneid)) 386 return (ENXIO); 387 #endif 388 if (sin6->sin6_scope_id != 0 && 389 zoneid != sin6->sin6_scope_id) { 390 log(LOG_NOTICE, 391 "%s: embedded scope mismatch: %s%%%d. " 392 "sin6_scope_id was overridden.", __func__, 393 ip6_sprintf(ip6buf, &sin6->sin6_addr), 394 sin6->sin6_scope_id); 395 } 396 sin6->sin6_addr.s6_addr16[1] = 0; 397 sin6->sin6_scope_id = zoneid; 398 } 399 } 400 401 return 0; 402 } 403 404 /* 405 * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is 406 * non NULL, it is set to the zone ID. If the zone ID needs to be embedded 407 * in the in6_addr structure, in6 will be modified. 408 * 409 * ret_id - unnecessary? 410 */ 411 int 412 in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id) 413 { 414 int scope; 415 u_int32_t zoneid = 0; 416 struct scope6_id *sid; 417 418 /* 419 * special case: the loopback address can only belong to a loopback 420 * interface. 421 */ 422 if (IN6_IS_ADDR_LOOPBACK(in6)) { 423 if (!(ifp->if_flags & IFF_LOOPBACK)) 424 return (EINVAL); 425 } else { 426 scope = in6_addrscope(in6); 427 if (scope == IPV6_ADDR_SCOPE_INTFACELOCAL || 428 scope == IPV6_ADDR_SCOPE_LINKLOCAL) { 429 /* 430 * Currently we use interface indeces as the 431 * zone IDs for interface-local and link-local 432 * scopes. 433 */ 434 zoneid = ifp->if_index; 435 in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */ 436 } else if (scope != IPV6_ADDR_SCOPE_GLOBAL) { 437 IF_AFDATA_RLOCK(ifp); 438 sid = SID(ifp); 439 zoneid = sid->s6id_list[scope]; 440 IF_AFDATA_RUNLOCK(ifp); 441 } 442 } 443 444 if (ret_id != NULL) 445 *ret_id = zoneid; 446 447 return (0); 448 } 449 450 /* 451 * Just clear the embedded scope identifier. Return 0 if the original address 452 * is intact; return non 0 if the address is modified. 453 */ 454 int 455 in6_clearscope(struct in6_addr *in6) 456 { 457 int modified = 0; 458 459 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) { 460 if (in6->s6_addr16[1] != 0) 461 modified = 1; 462 in6->s6_addr16[1] = 0; 463 } 464 465 return (modified); 466 } 467 468 /* 469 * Return the scope identifier or zero. 470 */ 471 uint16_t 472 in6_getscope(struct in6_addr *in6) 473 { 474 475 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) 476 return (in6->s6_addr16[1]); 477 478 return (0); 479 }
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