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/8.4/sys/netinet6/scope6.c 247964 2013-03-07 23:18:35Z tuexen $"); 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/syslog.h> 42 43 #include <net/if.h> 44 #include <net/vnet.h> 45 46 #include <netinet/in.h> 47 48 #include <netinet/ip6.h> 49 #include <netinet6/in6_var.h> 50 #include <netinet6/ip6_var.h> 51 #include <netinet6/scope6_var.h> 52 53 #ifdef ENABLE_DEFAULT_SCOPE 54 VNET_DEFINE(int, ip6_use_defzone) = 1; 55 #else 56 VNET_DEFINE(int, ip6_use_defzone) = 0; 57 #endif 58 59 /* 60 * The scope6_lock protects the global sid default stored in 61 * sid_default below. 62 */ 63 static struct mtx scope6_lock; 64 #define SCOPE6_LOCK_INIT() mtx_init(&scope6_lock, "scope6_lock", NULL, MTX_DEF) 65 #define SCOPE6_LOCK() mtx_lock(&scope6_lock) 66 #define SCOPE6_UNLOCK() mtx_unlock(&scope6_lock) 67 #define SCOPE6_LOCK_ASSERT() mtx_assert(&scope6_lock, MA_OWNED) 68 69 static VNET_DEFINE(struct scope6_id, sid_default); 70 #define V_sid_default VNET(sid_default) 71 72 #define SID(ifp) \ 73 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id) 74 75 void 76 scope6_init(void) 77 { 78 79 bzero(&V_sid_default, sizeof(V_sid_default)); 80 81 if (!IS_DEFAULT_VNET(curvnet)) 82 return; 83 84 SCOPE6_LOCK_INIT(); 85 } 86 87 struct scope6_id * 88 scope6_ifattach(struct ifnet *ifp) 89 { 90 struct scope6_id *sid; 91 92 sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK); 93 bzero(sid, sizeof(*sid)); 94 95 /* 96 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard. 97 * Should we rather hardcode here? 98 */ 99 sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index; 100 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index; 101 #ifdef MULTI_SCOPE 102 /* by default, we don't care about scope boundary for these scopes. */ 103 sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1; 104 sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1; 105 #endif 106 107 return sid; 108 } 109 110 void 111 scope6_ifdetach(struct scope6_id *sid) 112 { 113 114 free(sid, M_IFADDR); 115 } 116 117 int 118 scope6_set(struct ifnet *ifp, struct scope6_id *idlist) 119 { 120 int i; 121 int error = 0; 122 struct scope6_id *sid = NULL; 123 124 IF_AFDATA_WLOCK(ifp); 125 sid = SID(ifp); 126 127 if (!sid) { /* paranoid? */ 128 IF_AFDATA_WUNLOCK(ifp); 129 return (EINVAL); 130 } 131 132 /* 133 * XXX: We need more consistency checks of the relationship among 134 * scopes (e.g. an organization should be larger than a site). 135 */ 136 137 /* 138 * TODO(XXX): after setting, we should reflect the changes to 139 * interface addresses, routing table entries, PCB entries... 140 */ 141 142 for (i = 0; i < 16; i++) { 143 if (idlist->s6id_list[i] && 144 idlist->s6id_list[i] != sid->s6id_list[i]) { 145 /* 146 * An interface zone ID must be the corresponding 147 * interface index by definition. 148 */ 149 if (i == IPV6_ADDR_SCOPE_INTFACELOCAL && 150 idlist->s6id_list[i] != ifp->if_index) { 151 IF_AFDATA_WUNLOCK(ifp); 152 return (EINVAL); 153 } 154 155 if (i == IPV6_ADDR_SCOPE_LINKLOCAL && 156 idlist->s6id_list[i] > V_if_index) { 157 /* 158 * XXX: theoretically, there should be no 159 * relationship between link IDs and interface 160 * IDs, but we check the consistency for 161 * safety in later use. 162 */ 163 IF_AFDATA_WUNLOCK(ifp); 164 return (EINVAL); 165 } 166 167 /* 168 * XXX: we must need lots of work in this case, 169 * but we simply set the new value in this initial 170 * implementation. 171 */ 172 sid->s6id_list[i] = idlist->s6id_list[i]; 173 } 174 } 175 IF_AFDATA_WUNLOCK(ifp); 176 177 return (error); 178 } 179 180 int 181 scope6_get(struct ifnet *ifp, struct scope6_id *idlist) 182 { 183 struct scope6_id *sid; 184 185 /* We only need to lock the interface's afdata for SID() to work. */ 186 IF_AFDATA_RLOCK(ifp); 187 sid = SID(ifp); 188 if (sid == NULL) { /* paranoid? */ 189 IF_AFDATA_RUNLOCK(ifp); 190 return (EINVAL); 191 } 192 193 *idlist = *sid; 194 195 IF_AFDATA_RUNLOCK(ifp); 196 return (0); 197 } 198 199 200 /* 201 * Get a scope of the address. Node-local, link-local, site-local or global. 202 */ 203 int 204 in6_addrscope(struct in6_addr *addr) 205 { 206 int scope; 207 208 if (addr->s6_addr[0] == 0xfe) { 209 scope = addr->s6_addr[1] & 0xc0; 210 211 switch (scope) { 212 case 0x80: 213 return IPV6_ADDR_SCOPE_LINKLOCAL; 214 break; 215 case 0xc0: 216 return IPV6_ADDR_SCOPE_SITELOCAL; 217 break; 218 default: 219 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */ 220 break; 221 } 222 } 223 224 225 if (addr->s6_addr[0] == 0xff) { 226 scope = addr->s6_addr[1] & 0x0f; 227 228 /* 229 * due to other scope such as reserved, 230 * return scope doesn't work. 231 */ 232 switch (scope) { 233 case IPV6_ADDR_SCOPE_INTFACELOCAL: 234 return IPV6_ADDR_SCOPE_INTFACELOCAL; 235 break; 236 case IPV6_ADDR_SCOPE_LINKLOCAL: 237 return IPV6_ADDR_SCOPE_LINKLOCAL; 238 break; 239 case IPV6_ADDR_SCOPE_SITELOCAL: 240 return IPV6_ADDR_SCOPE_SITELOCAL; 241 break; 242 default: 243 return IPV6_ADDR_SCOPE_GLOBAL; 244 break; 245 } 246 } 247 248 /* 249 * Regard loopback and unspecified addresses as global, since 250 * they have no ambiguity. 251 */ 252 if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) { 253 if (addr->s6_addr[15] == 1) /* loopback */ 254 return IPV6_ADDR_SCOPE_LINKLOCAL; 255 if (addr->s6_addr[15] == 0) /* unspecified */ 256 return IPV6_ADDR_SCOPE_GLOBAL; /* XXX: correct? */ 257 } 258 259 return IPV6_ADDR_SCOPE_GLOBAL; 260 } 261 262 /* 263 * ifp - note that this might be NULL 264 */ 265 266 void 267 scope6_setdefault(struct ifnet *ifp) 268 { 269 270 /* 271 * Currently, this function just sets the default "interfaces" 272 * and "links" according to the given interface. 273 * We might eventually have to separate the notion of "link" from 274 * "interface" and provide a user interface to set the default. 275 */ 276 SCOPE6_LOCK(); 277 if (ifp) { 278 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 279 ifp->if_index; 280 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 281 ifp->if_index; 282 } else { 283 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0; 284 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0; 285 } 286 SCOPE6_UNLOCK(); 287 } 288 289 int 290 scope6_get_default(struct scope6_id *idlist) 291 { 292 293 SCOPE6_LOCK(); 294 *idlist = V_sid_default; 295 SCOPE6_UNLOCK(); 296 297 return (0); 298 } 299 300 u_int32_t 301 scope6_addr2default(struct in6_addr *addr) 302 { 303 u_int32_t id; 304 305 /* 306 * special case: The loopback address should be considered as 307 * link-local, but there's no ambiguity in the syntax. 308 */ 309 if (IN6_IS_ADDR_LOOPBACK(addr)) 310 return (0); 311 312 /* 313 * XXX: 32-bit read is atomic on all our platforms, is it OK 314 * not to lock here? 315 */ 316 SCOPE6_LOCK(); 317 id = V_sid_default.s6id_list[in6_addrscope(addr)]; 318 SCOPE6_UNLOCK(); 319 return (id); 320 } 321 322 /* 323 * Validate the specified scope zone ID in the sin6_scope_id field. If the ID 324 * is unspecified (=0), needs to be specified, and the default zone ID can be 325 * used, the default value will be used. 326 * This routine then generates the kernel-internal form: if the address scope 327 * of is interface-local or link-local, embed the interface index in the 328 * address. 329 */ 330 int 331 sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok) 332 { 333 struct ifnet *ifp; 334 u_int32_t zoneid; 335 336 if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok) 337 zoneid = scope6_addr2default(&sin6->sin6_addr); 338 339 if (zoneid != 0 && 340 (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 341 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) { 342 /* 343 * At this moment, we only check interface-local and 344 * link-local scope IDs, and use interface indices as the 345 * zone IDs assuming a one-to-one mapping between interfaces 346 * and links. 347 */ 348 if (V_if_index < zoneid) 349 return (ENXIO); 350 ifp = ifnet_byindex(zoneid); 351 if (ifp == NULL) /* XXX: this can happen for some OS */ 352 return (ENXIO); 353 354 /* XXX assignment to 16bit from 32bit variable */ 355 sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff); 356 357 sin6->sin6_scope_id = 0; 358 } 359 360 return 0; 361 } 362 363 /* 364 * generate standard sockaddr_in6 from embedded form. 365 */ 366 int 367 sa6_recoverscope(struct sockaddr_in6 *sin6) 368 { 369 char ip6buf[INET6_ADDRSTRLEN]; 370 u_int32_t zoneid; 371 372 if (sin6->sin6_scope_id != 0) { 373 log(LOG_NOTICE, 374 "sa6_recoverscope: assumption failure (non 0 ID): %s%%%d\n", 375 ip6_sprintf(ip6buf, &sin6->sin6_addr), sin6->sin6_scope_id); 376 /* XXX: proceed anyway... */ 377 } 378 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 379 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) { 380 /* 381 * KAME assumption: link id == interface id 382 */ 383 zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]); 384 if (zoneid) { 385 /* sanity check */ 386 if (V_if_index < zoneid) 387 return (ENXIO); 388 if (!ifnet_byindex(zoneid)) 389 return (ENXIO); 390 sin6->sin6_addr.s6_addr16[1] = 0; 391 sin6->sin6_scope_id = zoneid; 392 } 393 } 394 395 return 0; 396 } 397 398 /* 399 * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is 400 * non NULL, it is set to the zone ID. If the zone ID needs to be embedded 401 * in the in6_addr structure, in6 will be modified. 402 * 403 * ret_id - unnecessary? 404 */ 405 int 406 in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id) 407 { 408 int scope; 409 u_int32_t zoneid = 0; 410 struct scope6_id *sid; 411 412 IF_AFDATA_RLOCK(ifp); 413 414 sid = SID(ifp); 415 416 #ifdef DIAGNOSTIC 417 if (sid == NULL) { /* should not happen */ 418 panic("in6_setscope: scope array is NULL"); 419 /* NOTREACHED */ 420 } 421 #endif 422 423 /* 424 * special case: the loopback address can only belong to a loopback 425 * interface. 426 */ 427 if (IN6_IS_ADDR_LOOPBACK(in6)) { 428 if (!(ifp->if_flags & IFF_LOOPBACK)) { 429 IF_AFDATA_RUNLOCK(ifp); 430 return (EINVAL); 431 } else { 432 if (ret_id != NULL) 433 *ret_id = 0; /* there's no ambiguity */ 434 IF_AFDATA_RUNLOCK(ifp); 435 return (0); 436 } 437 } 438 439 scope = in6_addrscope(in6); 440 switch (scope) { 441 case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */ 442 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL]; 443 break; 444 445 case IPV6_ADDR_SCOPE_LINKLOCAL: 446 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]; 447 break; 448 449 case IPV6_ADDR_SCOPE_SITELOCAL: 450 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]; 451 break; 452 453 case IPV6_ADDR_SCOPE_ORGLOCAL: 454 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]; 455 break; 456 457 default: 458 zoneid = 0; /* XXX: treat as global. */ 459 break; 460 } 461 IF_AFDATA_RUNLOCK(ifp); 462 463 if (ret_id != NULL) 464 *ret_id = zoneid; 465 466 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) 467 in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */ 468 469 return (0); 470 } 471 472 /* 473 * Just clear the embedded scope identifier. Return 0 if the original address 474 * is intact; return non 0 if the address is modified. 475 */ 476 int 477 in6_clearscope(struct in6_addr *in6) 478 { 479 int modified = 0; 480 481 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) { 482 if (in6->s6_addr16[1] != 0) 483 modified = 1; 484 in6->s6_addr16[1] = 0; 485 } 486 487 return (modified); 488 } 489 490 /* 491 * Return the scope identifier or zero. 492 */ 493 uint16_t 494 in6_getscope(struct in6_addr *in6) 495 { 496 497 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) 498 return (in6->s6_addr16[1]); 499 500 return (0); 501 }
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