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("$FreeBSD$"); 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/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 60 /* 61 * The scope6_lock protects the global sid default stored in 62 * sid_default below. 63 */ 64 static struct mtx scope6_lock; 65 #define SCOPE6_LOCK_INIT() mtx_init(&scope6_lock, "scope6_lock", NULL, MTX_DEF) 66 #define SCOPE6_LOCK() mtx_lock(&scope6_lock) 67 #define SCOPE6_UNLOCK() mtx_unlock(&scope6_lock) 68 #define SCOPE6_LOCK_ASSERT() mtx_assert(&scope6_lock, MA_OWNED) 69 70 static VNET_DEFINE(struct scope6_id, sid_default); 71 #define V_sid_default VNET(sid_default) 72 73 #define SID(ifp) \ 74 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id) 75 76 static int scope6_get(struct ifnet *, struct scope6_id *); 77 static int scope6_set(struct ifnet *, struct scope6_id *); 78 79 void 80 scope6_init(void) 81 { 82 83 bzero(&V_sid_default, sizeof(V_sid_default)); 84 85 if (!IS_DEFAULT_VNET(curvnet)) 86 return; 87 88 SCOPE6_LOCK_INIT(); 89 } 90 91 struct scope6_id * 92 scope6_ifattach(struct ifnet *ifp) 93 { 94 struct scope6_id *sid; 95 96 sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK); 97 bzero(sid, sizeof(*sid)); 98 99 /* 100 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard. 101 * Should we rather hardcode here? 102 */ 103 sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index; 104 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index; 105 #ifdef MULTI_SCOPE 106 /* by default, we don't care about scope boundary for these scopes. */ 107 sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1; 108 sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1; 109 #endif 110 111 return sid; 112 } 113 114 void 115 scope6_ifdetach(struct scope6_id *sid) 116 { 117 118 free(sid, M_IFADDR); 119 } 120 121 int 122 scope6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 123 { 124 struct in6_ifreq *ifr; 125 126 if (ifp->if_afdata[AF_INET6] == NULL) 127 return (EPFNOSUPPORT); 128 129 ifr = (struct in6_ifreq *)data; 130 switch (cmd) { 131 case SIOCSSCOPE6: 132 return (scope6_set(ifp, 133 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 134 case SIOCGSCOPE6: 135 return (scope6_get(ifp, 136 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 137 case SIOCGSCOPE6DEF: 138 return (scope6_get_default( 139 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 140 default: 141 return (EOPNOTSUPP); 142 } 143 } 144 145 static int 146 scope6_set(struct ifnet *ifp, struct scope6_id *idlist) 147 { 148 int i; 149 int error = 0; 150 struct scope6_id *sid = NULL; 151 152 IF_AFDATA_WLOCK(ifp); 153 sid = SID(ifp); 154 155 if (!sid) { /* paranoid? */ 156 IF_AFDATA_WUNLOCK(ifp); 157 return (EINVAL); 158 } 159 160 /* 161 * XXX: We need more consistency checks of the relationship among 162 * scopes (e.g. an organization should be larger than a site). 163 */ 164 165 /* 166 * TODO(XXX): after setting, we should reflect the changes to 167 * interface addresses, routing table entries, PCB entries... 168 */ 169 170 for (i = 0; i < 16; i++) { 171 if (idlist->s6id_list[i] && 172 idlist->s6id_list[i] != sid->s6id_list[i]) { 173 /* 174 * An interface zone ID must be the corresponding 175 * interface index by definition. 176 */ 177 if (i == IPV6_ADDR_SCOPE_INTFACELOCAL && 178 idlist->s6id_list[i] != ifp->if_index) { 179 IF_AFDATA_WUNLOCK(ifp); 180 return (EINVAL); 181 } 182 183 if (i == IPV6_ADDR_SCOPE_LINKLOCAL && 184 idlist->s6id_list[i] > V_if_index) { 185 /* 186 * XXX: theoretically, there should be no 187 * relationship between link IDs and interface 188 * IDs, but we check the consistency for 189 * safety in later use. 190 */ 191 IF_AFDATA_WUNLOCK(ifp); 192 return (EINVAL); 193 } 194 195 /* 196 * XXX: we must need lots of work in this case, 197 * but we simply set the new value in this initial 198 * implementation. 199 */ 200 sid->s6id_list[i] = idlist->s6id_list[i]; 201 } 202 } 203 IF_AFDATA_WUNLOCK(ifp); 204 205 return (error); 206 } 207 208 static int 209 scope6_get(struct ifnet *ifp, struct scope6_id *idlist) 210 { 211 struct scope6_id *sid; 212 213 /* We only need to lock the interface's afdata for SID() to work. */ 214 IF_AFDATA_RLOCK(ifp); 215 sid = SID(ifp); 216 if (sid == NULL) { /* paranoid? */ 217 IF_AFDATA_RUNLOCK(ifp); 218 return (EINVAL); 219 } 220 221 *idlist = *sid; 222 223 IF_AFDATA_RUNLOCK(ifp); 224 return (0); 225 } 226 227 /* 228 * Get a scope of the address. Node-local, link-local, site-local or global. 229 */ 230 int 231 in6_addrscope(struct in6_addr *addr) 232 { 233 int scope; 234 235 if (addr->s6_addr[0] == 0xfe) { 236 scope = addr->s6_addr[1] & 0xc0; 237 238 switch (scope) { 239 case 0x80: 240 return IPV6_ADDR_SCOPE_LINKLOCAL; 241 break; 242 case 0xc0: 243 return IPV6_ADDR_SCOPE_SITELOCAL; 244 break; 245 default: 246 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */ 247 break; 248 } 249 } 250 251 252 if (addr->s6_addr[0] == 0xff) { 253 scope = addr->s6_addr[1] & 0x0f; 254 255 /* 256 * due to other scope such as reserved, 257 * return scope doesn't work. 258 */ 259 switch (scope) { 260 case IPV6_ADDR_SCOPE_INTFACELOCAL: 261 return IPV6_ADDR_SCOPE_INTFACELOCAL; 262 break; 263 case IPV6_ADDR_SCOPE_LINKLOCAL: 264 return IPV6_ADDR_SCOPE_LINKLOCAL; 265 break; 266 case IPV6_ADDR_SCOPE_SITELOCAL: 267 return IPV6_ADDR_SCOPE_SITELOCAL; 268 break; 269 default: 270 return IPV6_ADDR_SCOPE_GLOBAL; 271 break; 272 } 273 } 274 275 /* 276 * Regard loopback and unspecified addresses as global, since 277 * they have no ambiguity. 278 */ 279 if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) { 280 if (addr->s6_addr[15] == 1) /* loopback */ 281 return IPV6_ADDR_SCOPE_LINKLOCAL; 282 if (addr->s6_addr[15] == 0) /* unspecified */ 283 return IPV6_ADDR_SCOPE_GLOBAL; /* XXX: correct? */ 284 } 285 286 return IPV6_ADDR_SCOPE_GLOBAL; 287 } 288 289 /* 290 * ifp - note that this might be NULL 291 */ 292 293 void 294 scope6_setdefault(struct ifnet *ifp) 295 { 296 297 /* 298 * Currently, this function just sets the default "interfaces" 299 * and "links" according to the given interface. 300 * We might eventually have to separate the notion of "link" from 301 * "interface" and provide a user interface to set the default. 302 */ 303 SCOPE6_LOCK(); 304 if (ifp) { 305 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 306 ifp->if_index; 307 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 308 ifp->if_index; 309 } else { 310 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0; 311 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0; 312 } 313 SCOPE6_UNLOCK(); 314 } 315 316 int 317 scope6_get_default(struct scope6_id *idlist) 318 { 319 320 SCOPE6_LOCK(); 321 *idlist = V_sid_default; 322 SCOPE6_UNLOCK(); 323 324 return (0); 325 } 326 327 u_int32_t 328 scope6_addr2default(struct in6_addr *addr) 329 { 330 u_int32_t id; 331 332 /* 333 * special case: The loopback address should be considered as 334 * link-local, but there's no ambiguity in the syntax. 335 */ 336 if (IN6_IS_ADDR_LOOPBACK(addr)) 337 return (0); 338 339 /* 340 * XXX: 32-bit read is atomic on all our platforms, is it OK 341 * not to lock here? 342 */ 343 SCOPE6_LOCK(); 344 id = V_sid_default.s6id_list[in6_addrscope(addr)]; 345 SCOPE6_UNLOCK(); 346 return (id); 347 } 348 349 /* 350 * Validate the specified scope zone ID in the sin6_scope_id field. If the ID 351 * is unspecified (=0), needs to be specified, and the default zone ID can be 352 * used, the default value will be used. 353 * This routine then generates the kernel-internal form: if the address scope 354 * of is interface-local or link-local, embed the interface index in the 355 * address. 356 */ 357 int 358 sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok) 359 { 360 struct ifnet *ifp; 361 u_int32_t zoneid; 362 363 if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok) 364 zoneid = scope6_addr2default(&sin6->sin6_addr); 365 366 if (zoneid != 0 && 367 (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 368 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) { 369 /* 370 * At this moment, we only check interface-local and 371 * link-local scope IDs, and use interface indices as the 372 * zone IDs assuming a one-to-one mapping between interfaces 373 * and links. 374 */ 375 if (V_if_index < zoneid) 376 return (ENXIO); 377 ifp = ifnet_byindex(zoneid); 378 if (ifp == NULL) /* XXX: this can happen for some OS */ 379 return (ENXIO); 380 381 /* XXX assignment to 16bit from 32bit variable */ 382 sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff); 383 384 sin6->sin6_scope_id = 0; 385 } 386 387 return 0; 388 } 389 390 /* 391 * generate standard sockaddr_in6 from embedded form. 392 */ 393 int 394 sa6_recoverscope(struct sockaddr_in6 *sin6) 395 { 396 char ip6buf[INET6_ADDRSTRLEN]; 397 u_int32_t zoneid; 398 399 if (sin6->sin6_scope_id != 0) { 400 log(LOG_NOTICE, 401 "sa6_recoverscope: assumption failure (non 0 ID): %s%%%d\n", 402 ip6_sprintf(ip6buf, &sin6->sin6_addr), sin6->sin6_scope_id); 403 /* XXX: proceed anyway... */ 404 } 405 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 406 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) { 407 /* 408 * KAME assumption: link id == interface id 409 */ 410 zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]); 411 if (zoneid) { 412 /* sanity check */ 413 if (V_if_index < zoneid) 414 return (ENXIO); 415 if (!ifnet_byindex(zoneid)) 416 return (ENXIO); 417 sin6->sin6_addr.s6_addr16[1] = 0; 418 sin6->sin6_scope_id = zoneid; 419 } 420 } 421 422 return 0; 423 } 424 425 /* 426 * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is 427 * non NULL, it is set to the zone ID. If the zone ID needs to be embedded 428 * in the in6_addr structure, in6 will be modified. 429 * 430 * ret_id - unnecessary? 431 */ 432 int 433 in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id) 434 { 435 int scope; 436 u_int32_t zoneid = 0; 437 struct scope6_id *sid; 438 439 IF_AFDATA_RLOCK(ifp); 440 441 sid = SID(ifp); 442 443 #ifdef DIAGNOSTIC 444 if (sid == NULL) { /* should not happen */ 445 panic("in6_setscope: scope array is NULL"); 446 /* NOTREACHED */ 447 } 448 #endif 449 450 /* 451 * special case: the loopback address can only belong to a loopback 452 * interface. 453 */ 454 if (IN6_IS_ADDR_LOOPBACK(in6)) { 455 if (!(ifp->if_flags & IFF_LOOPBACK)) { 456 IF_AFDATA_RUNLOCK(ifp); 457 return (EINVAL); 458 } else { 459 if (ret_id != NULL) 460 *ret_id = 0; /* there's no ambiguity */ 461 IF_AFDATA_RUNLOCK(ifp); 462 return (0); 463 } 464 } 465 466 scope = in6_addrscope(in6); 467 switch (scope) { 468 case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */ 469 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL]; 470 break; 471 472 case IPV6_ADDR_SCOPE_LINKLOCAL: 473 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]; 474 break; 475 476 case IPV6_ADDR_SCOPE_SITELOCAL: 477 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]; 478 break; 479 480 case IPV6_ADDR_SCOPE_ORGLOCAL: 481 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]; 482 break; 483 484 default: 485 zoneid = 0; /* XXX: treat as global. */ 486 break; 487 } 488 IF_AFDATA_RUNLOCK(ifp); 489 490 if (ret_id != NULL) 491 *ret_id = zoneid; 492 493 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) 494 in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */ 495 496 return (0); 497 } 498 499 /* 500 * Just clear the embedded scope identifier. Return 0 if the original address 501 * is intact; return non 0 if the address is modified. 502 */ 503 int 504 in6_clearscope(struct in6_addr *in6) 505 { 506 int modified = 0; 507 508 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) { 509 if (in6->s6_addr16[1] != 0) 510 modified = 1; 511 in6->s6_addr16[1] = 0; 512 } 513 514 return (modified); 515 } 516 517 /* 518 * Return the scope identifier or zero. 519 */ 520 uint16_t 521 in6_getscope(struct in6_addr *in6) 522 { 523 524 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) 525 return (in6->s6_addr16[1]); 526 527 return (0); 528 }
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