scope6.c revision 1.1
1 /* $NetBSD: scope6.c,v 1.1 2006/01/21 00:15:37 rpaulo Exp $ */ 2 /* $KAME$ */ 3 4 /*- 5 * Copyright (C) 2000 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/malloc.h> 35 #include <sys/mbuf.h> 36 #include <sys/socket.h> 37 #include <sys/systm.h> 38 #include <sys/queue.h> 39 #include <sys/syslog.h> 40 41 #include <net/route.h> 42 #include <net/if.h> 43 44 #include <netinet/in.h> 45 46 #include <netinet6/in6_var.h> 47 #include <netinet6/scope6_var.h> 48 49 #ifdef ENABLE_DEFAULT_SCOPE 50 int ip6_use_defzone = 1; 51 #else 52 int ip6_use_defzone = 0; 53 #endif 54 55 static struct scope6_id sid_default; 56 #define SID(ifp) \ 57 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id) 58 59 void 60 scope6_init() 61 { 62 63 bzero(&sid_default, sizeof(sid_default)); 64 } 65 66 struct scope6_id * 67 scope6_ifattach(struct ifnet *ifp) 68 { 69 struct scope6_id *sid; 70 71 sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK); 72 bzero(sid, sizeof(*sid)); 73 74 /* 75 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard. 76 * Should we rather hardcode here? 77 */ 78 sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index; 79 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index; 80 #ifdef MULTI_SCOPE 81 /* by default, we don't care about scope boundary for these scopes. */ 82 sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1; 83 sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1; 84 #endif 85 86 return sid; 87 } 88 89 void 90 scope6_ifdetach(struct scope6_id *sid) 91 { 92 93 free(sid, M_IFADDR); 94 } 95 96 int 97 scope6_set(struct ifnet *ifp, struct scope6_id *idlist) 98 { 99 int i; 100 int error = 0; 101 struct scope6_id *sid = NULL; 102 103 sid = SID(ifp); 104 105 if (!sid) /* paranoid? */ 106 return (EINVAL); 107 108 /* 109 * XXX: We need more consistency checks of the relationship among 110 * scopes (e.g. an organization should be larger than a site). 111 */ 112 113 /* 114 * TODO(XXX): after setting, we should reflect the changes to 115 * interface addresses, routing table entries, PCB entries... 116 */ 117 118 for (i = 0; i < 16; i++) { 119 if (idlist->s6id_list[i] && 120 idlist->s6id_list[i] != sid->s6id_list[i]) { 121 /* 122 * An interface zone ID must be the corresponding 123 * interface index by definition. 124 */ 125 if (i == IPV6_ADDR_SCOPE_INTFACELOCAL && 126 idlist->s6id_list[i] != ifp->if_index) 127 return (EINVAL); 128 129 if (i == IPV6_ADDR_SCOPE_LINKLOCAL && 130 idlist->s6id_list[i] >= if_indexlim) { 131 /* 132 * XXX: theoretically, there should be no 133 * relationship between link IDs and interface 134 * IDs, but we check the consistency for 135 * safety in later use. 136 */ 137 return (EINVAL); 138 } 139 140 /* 141 * XXX: we must need lots of work in this case, 142 * but we simply set the new value in this initial 143 * implementation. 144 */ 145 sid->s6id_list[i] = idlist->s6id_list[i]; 146 } 147 } 148 149 return (error); 150 } 151 152 int 153 scope6_get(struct ifnet *ifp, struct scope6_id *idlist) 154 { 155 156 /* We only need to lock the interface's afdata for SID() to work. */ 157 struct scope6_id *sid = SID(ifp); 158 159 if (sid == NULL) /* paranoid? */ 160 return (EINVAL); 161 162 *idlist = *sid; 163 164 return (0); 165 } 166 167 /* 168 * Get a scope of the address. Interface-local, link-local, site-local 169 * or global. 170 */ 171 int 172 in6_addrscope(struct in6_addr *addr) 173 { 174 int scope; 175 176 if (addr->s6_addr[0] == 0xfe) { 177 scope = addr->s6_addr[1] & 0xc0; 178 179 switch (scope) { 180 case 0x80: 181 return IPV6_ADDR_SCOPE_LINKLOCAL; 182 break; 183 case 0xc0: 184 return IPV6_ADDR_SCOPE_SITELOCAL; 185 break; 186 default: 187 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */ 188 break; 189 } 190 } 191 192 193 if (addr->s6_addr[0] == 0xff) { 194 scope = addr->s6_addr[1] & 0x0f; 195 196 /* 197 * due to other scope such as reserved, 198 * return scope doesn't work. 199 */ 200 switch (scope) { 201 case IPV6_ADDR_SCOPE_INTFACELOCAL: 202 return IPV6_ADDR_SCOPE_INTFACELOCAL; 203 break; 204 case IPV6_ADDR_SCOPE_LINKLOCAL: 205 return IPV6_ADDR_SCOPE_LINKLOCAL; 206 break; 207 case IPV6_ADDR_SCOPE_SITELOCAL: 208 return IPV6_ADDR_SCOPE_SITELOCAL; 209 break; 210 default: 211 return IPV6_ADDR_SCOPE_GLOBAL; 212 break; 213 } 214 } 215 216 if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) { 217 if (addr->s6_addr[15] == 1) /* loopback */ 218 return IPV6_ADDR_SCOPE_LINKLOCAL; 219 if (addr->s6_addr[15] == 0) { 220 /* 221 * Regard the unspecified addresses as global, 222 * since it has no ambiguity. 223 * XXX: not sure if it's correct... 224 */ 225 return IPV6_ADDR_SCOPE_GLOBAL; 226 } 227 } 228 229 return IPV6_ADDR_SCOPE_GLOBAL; 230 } 231 232 /* note that ifp argument might be NULL */ 233 void 234 scope6_setdefault(struct ifnet *ifp) 235 { 236 237 /* 238 * Currently, this function just sets the default "interfaces" 239 * and "links" according to the given interface. 240 * We might eventually have to separate the notion of "link" from 241 * "interface" and provide a user interface to set the default. 242 */ 243 if (ifp) { 244 sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 245 ifp->if_index; 246 sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 247 ifp->if_index; 248 } else { 249 sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0; 250 sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0; 251 } 252 } 253 254 int 255 scope6_get_default(struct scope6_id *idlist) 256 { 257 258 *idlist = sid_default; 259 260 return (0); 261 } 262 263 uint32_t 264 scope6_addr2default(struct in6_addr *addr) 265 { 266 uint32_t id; 267 268 /* 269 * special case: The loopback address should be considered as 270 * link-local, but there's no ambiguity in the syntax. 271 */ 272 if (IN6_IS_ADDR_LOOPBACK(addr)) 273 return (0); 274 275 /* 276 * XXX: 32-bit read is atomic on all our platforms, is it OK 277 * not to lock here? 278 */ 279 id = sid_default.s6id_list[in6_addrscope(addr)]; 280 281 return (id); 282 } 283 284 /* 285 * Validate the specified scope zone ID in the sin6_scope_id field. If the ID 286 * is unspecified (=0), needs to be specified, and the default zone ID can be 287 * used, the default value will be used. 288 * This routine then generates the kernel-internal form: if the address scope 289 * of is interface-local or link-local, embed the interface index in the 290 * address. 291 */ 292 int 293 sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok) 294 { 295 struct ifnet *ifp; 296 uint32_t zoneid; 297 298 if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok) 299 zoneid = scope6_addr2default(&sin6->sin6_addr); 300 301 if (zoneid != 0 && 302 (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 303 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) { 304 /* 305 * At this moment, we only check interface-local and 306 * link-local scope IDs, and use interface indices as the 307 * zone IDs assuming a one-to-one mapping between interfaces 308 * and links. 309 */ 310 if (if_indexlim <= zoneid) 311 return (ENXIO); 312 #ifdef __FreeBSD__ 313 ifp = ifnet_byindex(zoneid); 314 #else 315 ifp = ifindex2ifnet[zoneid]; 316 #endif 317 if (ifp == NULL) /* XXX: this can happen for some OS */ 318 return (ENXIO); 319 320 /* XXX assignment to 16bit from 32bit variable */ 321 sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff); 322 323 sin6->sin6_scope_id = 0; 324 } 325 326 return 0; 327 } 328 329 /* 330 * generate standard sockaddr_in6 from embedded form. 331 */ 332 int 333 sa6_recoverscope(struct sockaddr_in6 *sin6) 334 { 335 uint32_t zoneid; 336 337 if (sin6->sin6_scope_id != 0) { 338 log(LOG_NOTICE, 339 "sa6_recoverscope: assumption failure (non 0 ID): %s%%%d\n", 340 ip6_sprintf(&sin6->sin6_addr), sin6->sin6_scope_id); 341 /* XXX: proceed anyway... */ 342 } 343 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 344 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) { 345 /* 346 * KAME assumption: link id == interface id 347 */ 348 zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]); 349 if (zoneid) { 350 /* sanity check */ 351 if (zoneid < 0 || if_indexlim <= zoneid) 352 return (ENXIO); 353 #ifdef __FreeBSD__ 354 if (!ifnet_byindex(zoneid)) 355 #else 356 if (!ifindex2ifnet[zoneid]) 357 #endif 358 return (ENXIO); 359 sin6->sin6_addr.s6_addr16[1] = 0; 360 sin6->sin6_scope_id = zoneid; 361 } 362 } 363 364 return 0; 365 } 366 367 /* 368 * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is 369 * non NULL, it is set to the zone ID. If the zone ID needs to be embedded 370 * in the in6_addr structure, in6 will be modified. 371 */ 372 int 373 in6_setscope(struct in6_addr *in6, struct ifnet *ifp, uint32_t *ret_id) 374 { 375 int scope; 376 uint32_t zoneid = 0; 377 struct scope6_id *sid = SID(ifp); 378 379 #ifdef DIAGNOSTIC 380 if (sid == NULL) { /* should not happen */ 381 panic("in6_setscope: scope array is NULL"); 382 /* NOTREACHED */ 383 } 384 #endif 385 386 /* 387 * special case: the loopback address can only belong to a loopback 388 * interface. 389 */ 390 if (IN6_IS_ADDR_LOOPBACK(in6)) { 391 if (!(ifp->if_flags & IFF_LOOPBACK)) 392 return (EINVAL); 393 else { 394 if (ret_id != NULL) 395 *ret_id = 0; /* there's no ambiguity */ 396 return (0); 397 } 398 } 399 400 scope = in6_addrscope(in6); 401 402 if (!sid->s6id_list) 403 return 0; 404 405 switch (scope) { 406 case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */ 407 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL]; 408 break; 409 410 case IPV6_ADDR_SCOPE_LINKLOCAL: 411 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]; 412 break; 413 414 case IPV6_ADDR_SCOPE_SITELOCAL: 415 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]; 416 break; 417 418 case IPV6_ADDR_SCOPE_ORGLOCAL: 419 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]; 420 break; 421 422 default: 423 zoneid = 0; /* XXX: treat as global. */ 424 break; 425 } 426 427 if (ret_id != NULL) 428 *ret_id = zoneid; 429 430 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) 431 in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */ 432 433 return (0); 434 } 435 436 /* 437 * Just clear the embedded scope identifier. Return 0 if the original address 438 * is intact; return non 0 if the address is modified. 439 */ 440 int 441 in6_clearscope(struct in6_addr *in6) 442 { 443 int modified = 0; 444 445 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) { 446 if (in6->s6_addr16[1] != 0) 447 modified = 1; 448 in6->s6_addr16[1] = 0; 449 } 450 451 return (modified); 452 } 453
Indexes created Sun Sep 21 20:09:37 GMT 2025