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/8.0/sys/netinet6/scope6.c 196019 2009-08-01 19:26:27Z rwatson $"); 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 54 /* 55 * The scope6_lock protects the global sid default stored in 56 * sid_default below. 57 */ 58 static struct mtx scope6_lock; 59 #define SCOPE6_LOCK_INIT() mtx_init(&scope6_lock, "scope6_lock", NULL, MTX_DEF) 60 #define SCOPE6_LOCK() mtx_lock(&scope6_lock) 61 #define SCOPE6_UNLOCK() mtx_unlock(&scope6_lock) 62 #define SCOPE6_LOCK_ASSERT() mtx_assert(&scope6_lock, MA_OWNED) 63 64 static VNET_DEFINE(struct scope6_id, sid_default); 65 VNET_DEFINE(int, ip6_use_defzone); 66 67 #define V_sid_default VNET(sid_default) 68 69 #define SID(ifp) \ 70 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id) 71 72 void 73 scope6_init(void) 74 { 75 76 #ifdef ENABLE_DEFAULT_SCOPE 77 V_ip6_use_defzone = 1; 78 #else 79 V_ip6_use_defzone = 0; 80 #endif 81 bzero(&V_sid_default, sizeof(V_sid_default)); 82 83 if (!IS_DEFAULT_VNET(curvnet)) 84 return; 85 86 SCOPE6_LOCK_INIT(); 87 } 88 89 struct scope6_id * 90 scope6_ifattach(struct ifnet *ifp) 91 { 92 struct scope6_id *sid; 93 94 sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK); 95 bzero(sid, sizeof(*sid)); 96 97 /* 98 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard. 99 * Should we rather hardcode here? 100 */ 101 sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index; 102 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index; 103 #ifdef MULTI_SCOPE 104 /* by default, we don't care about scope boundary for these scopes. */ 105 sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1; 106 sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1; 107 #endif 108 109 return sid; 110 } 111 112 void 113 scope6_ifdetach(struct scope6_id *sid) 114 { 115 116 free(sid, M_IFADDR); 117 } 118 119 int 120 scope6_set(struct ifnet *ifp, struct scope6_id *idlist) 121 { 122 int i; 123 int error = 0; 124 struct scope6_id *sid = NULL; 125 126 IF_AFDATA_LOCK(ifp); 127 sid = SID(ifp); 128 129 if (!sid) { /* paranoid? */ 130 IF_AFDATA_UNLOCK(ifp); 131 return (EINVAL); 132 } 133 134 /* 135 * XXX: We need more consistency checks of the relationship among 136 * scopes (e.g. an organization should be larger than a site). 137 */ 138 139 /* 140 * TODO(XXX): after setting, we should reflect the changes to 141 * interface addresses, routing table entries, PCB entries... 142 */ 143 144 SCOPE6_LOCK(); 145 for (i = 0; i < 16; i++) { 146 if (idlist->s6id_list[i] && 147 idlist->s6id_list[i] != sid->s6id_list[i]) { 148 /* 149 * An interface zone ID must be the corresponding 150 * interface index by definition. 151 */ 152 if (i == IPV6_ADDR_SCOPE_INTFACELOCAL && 153 idlist->s6id_list[i] != ifp->if_index) { 154 IF_AFDATA_UNLOCK(ifp); 155 SCOPE6_UNLOCK(); 156 return (EINVAL); 157 } 158 159 if (i == IPV6_ADDR_SCOPE_LINKLOCAL && 160 idlist->s6id_list[i] > V_if_index) { 161 /* 162 * XXX: theoretically, there should be no 163 * relationship between link IDs and interface 164 * IDs, but we check the consistency for 165 * safety in later use. 166 */ 167 IF_AFDATA_UNLOCK(ifp); 168 SCOPE6_UNLOCK(); 169 return (EINVAL); 170 } 171 172 /* 173 * XXX: we must need lots of work in this case, 174 * but we simply set the new value in this initial 175 * implementation. 176 */ 177 sid->s6id_list[i] = idlist->s6id_list[i]; 178 } 179 } 180 SCOPE6_UNLOCK(); 181 IF_AFDATA_UNLOCK(ifp); 182 183 return (error); 184 } 185 186 int 187 scope6_get(struct ifnet *ifp, struct scope6_id *idlist) 188 { 189 /* We only need to lock the interface's afdata for SID() to work. */ 190 IF_AFDATA_LOCK(ifp); 191 struct scope6_id *sid = SID(ifp); 192 193 if (sid == NULL) { /* paranoid? */ 194 IF_AFDATA_UNLOCK(ifp); 195 return (EINVAL); 196 } 197 198 SCOPE6_LOCK(); 199 *idlist = *sid; 200 SCOPE6_UNLOCK(); 201 202 IF_AFDATA_UNLOCK(ifp); 203 return (0); 204 } 205 206 207 /* 208 * Get a scope of the address. Node-local, link-local, site-local or global. 209 */ 210 int 211 in6_addrscope(struct in6_addr *addr) 212 { 213 int scope; 214 215 if (addr->s6_addr[0] == 0xfe) { 216 scope = addr->s6_addr[1] & 0xc0; 217 218 switch (scope) { 219 case 0x80: 220 return IPV6_ADDR_SCOPE_LINKLOCAL; 221 break; 222 case 0xc0: 223 return IPV6_ADDR_SCOPE_SITELOCAL; 224 break; 225 default: 226 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */ 227 break; 228 } 229 } 230 231 232 if (addr->s6_addr[0] == 0xff) { 233 scope = addr->s6_addr[1] & 0x0f; 234 235 /* 236 * due to other scope such as reserved, 237 * return scope doesn't work. 238 */ 239 switch (scope) { 240 case IPV6_ADDR_SCOPE_INTFACELOCAL: 241 return IPV6_ADDR_SCOPE_INTFACELOCAL; 242 break; 243 case IPV6_ADDR_SCOPE_LINKLOCAL: 244 return IPV6_ADDR_SCOPE_LINKLOCAL; 245 break; 246 case IPV6_ADDR_SCOPE_SITELOCAL: 247 return IPV6_ADDR_SCOPE_SITELOCAL; 248 break; 249 default: 250 return IPV6_ADDR_SCOPE_GLOBAL; 251 break; 252 } 253 } 254 255 /* 256 * Regard loopback and unspecified addresses as global, since 257 * they have no ambiguity. 258 */ 259 if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) { 260 if (addr->s6_addr[15] == 1) /* loopback */ 261 return IPV6_ADDR_SCOPE_LINKLOCAL; 262 if (addr->s6_addr[15] == 0) /* unspecified */ 263 return IPV6_ADDR_SCOPE_GLOBAL; /* XXX: correct? */ 264 } 265 266 return IPV6_ADDR_SCOPE_GLOBAL; 267 } 268 269 /* 270 * ifp - note that this might be NULL 271 */ 272 273 void 274 scope6_setdefault(struct ifnet *ifp) 275 { 276 277 /* 278 * Currently, this function just sets the default "interfaces" 279 * and "links" according to the given interface. 280 * We might eventually have to separate the notion of "link" from 281 * "interface" and provide a user interface to set the default. 282 */ 283 SCOPE6_LOCK(); 284 if (ifp) { 285 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 286 ifp->if_index; 287 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 288 ifp->if_index; 289 } else { 290 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0; 291 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0; 292 } 293 SCOPE6_UNLOCK(); 294 } 295 296 int 297 scope6_get_default(struct scope6_id *idlist) 298 { 299 300 SCOPE6_LOCK(); 301 *idlist = V_sid_default; 302 SCOPE6_UNLOCK(); 303 304 return (0); 305 } 306 307 u_int32_t 308 scope6_addr2default(struct in6_addr *addr) 309 { 310 u_int32_t id; 311 312 /* 313 * special case: The loopback address should be considered as 314 * link-local, but there's no ambiguity in the syntax. 315 */ 316 if (IN6_IS_ADDR_LOOPBACK(addr)) 317 return (0); 318 319 /* 320 * XXX: 32-bit read is atomic on all our platforms, is it OK 321 * not to lock here? 322 */ 323 SCOPE6_LOCK(); 324 id = V_sid_default.s6id_list[in6_addrscope(addr)]; 325 SCOPE6_UNLOCK(); 326 return (id); 327 } 328 329 /* 330 * Validate the specified scope zone ID in the sin6_scope_id field. If the ID 331 * is unspecified (=0), needs to be specified, and the default zone ID can be 332 * used, the default value will be used. 333 * This routine then generates the kernel-internal form: if the address scope 334 * of is interface-local or link-local, embed the interface index in the 335 * address. 336 */ 337 int 338 sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok) 339 { 340 struct ifnet *ifp; 341 u_int32_t zoneid; 342 343 if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok) 344 zoneid = scope6_addr2default(&sin6->sin6_addr); 345 346 if (zoneid != 0 && 347 (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 348 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) { 349 /* 350 * At this moment, we only check interface-local and 351 * link-local scope IDs, and use interface indices as the 352 * zone IDs assuming a one-to-one mapping between interfaces 353 * and links. 354 */ 355 if (V_if_index < zoneid) 356 return (ENXIO); 357 ifp = ifnet_byindex(zoneid); 358 if (ifp == NULL) /* XXX: this can happen for some OS */ 359 return (ENXIO); 360 361 /* XXX assignment to 16bit from 32bit variable */ 362 sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff); 363 364 sin6->sin6_scope_id = 0; 365 } 366 367 return 0; 368 } 369 370 /* 371 * generate standard sockaddr_in6 from embedded form. 372 */ 373 int 374 sa6_recoverscope(struct sockaddr_in6 *sin6) 375 { 376 char ip6buf[INET6_ADDRSTRLEN]; 377 u_int32_t zoneid; 378 379 if (sin6->sin6_scope_id != 0) { 380 log(LOG_NOTICE, 381 "sa6_recoverscope: assumption failure (non 0 ID): %s%%%d\n", 382 ip6_sprintf(ip6buf, &sin6->sin6_addr), sin6->sin6_scope_id); 383 /* XXX: proceed anyway... */ 384 } 385 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 386 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) { 387 /* 388 * KAME assumption: link id == interface id 389 */ 390 zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]); 391 if (zoneid) { 392 /* sanity check */ 393 if (zoneid < 0 || V_if_index < zoneid) 394 return (ENXIO); 395 if (!ifnet_byindex(zoneid)) 396 return (ENXIO); 397 sin6->sin6_addr.s6_addr16[1] = 0; 398 sin6->sin6_scope_id = zoneid; 399 } 400 } 401 402 return 0; 403 } 404 405 /* 406 * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is 407 * non NULL, it is set to the zone ID. If the zone ID needs to be embedded 408 * in the in6_addr structure, in6 will be modified. 409 * 410 * ret_id - unnecessary? 411 */ 412 int 413 in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id) 414 { 415 int scope; 416 u_int32_t zoneid = 0; 417 struct scope6_id *sid; 418 419 IF_AFDATA_LOCK(ifp); 420 421 sid = SID(ifp); 422 423 #ifdef DIAGNOSTIC 424 if (sid == NULL) { /* should not happen */ 425 panic("in6_setscope: scope array is NULL"); 426 /* NOTREACHED */ 427 } 428 #endif 429 430 /* 431 * special case: the loopback address can only belong to a loopback 432 * interface. 433 */ 434 if (IN6_IS_ADDR_LOOPBACK(in6)) { 435 if (!(ifp->if_flags & IFF_LOOPBACK)) { 436 IF_AFDATA_UNLOCK(ifp); 437 return (EINVAL); 438 } else { 439 if (ret_id != NULL) 440 *ret_id = 0; /* there's no ambiguity */ 441 IF_AFDATA_UNLOCK(ifp); 442 return (0); 443 } 444 } 445 446 scope = in6_addrscope(in6); 447 448 SCOPE6_LOCK(); 449 switch (scope) { 450 case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */ 451 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL]; 452 break; 453 454 case IPV6_ADDR_SCOPE_LINKLOCAL: 455 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]; 456 break; 457 458 case IPV6_ADDR_SCOPE_SITELOCAL: 459 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]; 460 break; 461 462 case IPV6_ADDR_SCOPE_ORGLOCAL: 463 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]; 464 break; 465 466 default: 467 zoneid = 0; /* XXX: treat as global. */ 468 break; 469 } 470 SCOPE6_UNLOCK(); 471 IF_AFDATA_UNLOCK(ifp); 472 473 if (ret_id != NULL) 474 *ret_id = zoneid; 475 476 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) 477 in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */ 478 479 return (0); 480 } 481 482 /* 483 * Just clear the embedded scope identifier. Return 0 if the original address 484 * is intact; return non 0 if the address is modified. 485 */ 486 int 487 in6_clearscope(struct in6_addr *in6) 488 { 489 int modified = 0; 490 491 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) { 492 if (in6->s6_addr16[1] != 0) 493 modified = 1; 494 in6->s6_addr16[1] = 0; 495 } 496 497 return (modified); 498 }
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