2 * Copyright (C) 2000 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 * $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/malloc.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>
45 #include <net/if_var.h>
48 #include <netinet/in.h>
50 #include <netinet/ip6.h>
51 #include <netinet6/in6_var.h>
52 #include <netinet6/ip6_var.h>
53 #include <netinet6/scope6_var.h>
55 #ifdef ENABLE_DEFAULT_SCOPE
56 VNET_DEFINE(int, ip6_use_defzone) = 1;
58 VNET_DEFINE(int, ip6_use_defzone) = 0;
60 VNET_DEFINE(int, deembed_scopeid) = 1;
61 SYSCTL_DECL(_net_inet6_ip6);
62 SYSCTL_VNET_INT(_net_inet6_ip6, OID_AUTO, deembed_scopeid, CTLFLAG_RW,
63 &VNET_NAME(deembed_scopeid), 0,
64 "Extract embedded zone ID and set it to sin6_scope_id in sockaddr_in6.");
67 * The scope6_lock protects the global sid default stored in
70 static struct mtx scope6_lock;
71 #define SCOPE6_LOCK_INIT() mtx_init(&scope6_lock, "scope6_lock", NULL, MTX_DEF)
72 #define SCOPE6_LOCK() mtx_lock(&scope6_lock)
73 #define SCOPE6_UNLOCK() mtx_unlock(&scope6_lock)
74 #define SCOPE6_LOCK_ASSERT() mtx_assert(&scope6_lock, MA_OWNED)
76 static VNET_DEFINE(struct scope6_id, sid_default);
77 #define V_sid_default VNET(sid_default)
80 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id)
86 bzero(&V_sid_default, sizeof(V_sid_default));
88 if (!IS_DEFAULT_VNET(curvnet))
95 scope6_ifattach(struct ifnet *ifp)
97 struct scope6_id *sid;
99 sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK);
100 bzero(sid, sizeof(*sid));
103 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
104 * Should we rather hardcode here?
106 sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index;
107 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
109 /* by default, we don't care about scope boundary for these scopes. */
110 sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
111 sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
118 scope6_ifdetach(struct scope6_id *sid)
125 scope6_set(struct ifnet *ifp, struct scope6_id *idlist)
129 struct scope6_id *sid = NULL;
131 IF_AFDATA_WLOCK(ifp);
134 if (!sid) { /* paranoid? */
135 IF_AFDATA_WUNLOCK(ifp);
140 * XXX: We need more consistency checks of the relationship among
141 * scopes (e.g. an organization should be larger than a site).
145 * TODO(XXX): after setting, we should reflect the changes to
146 * interface addresses, routing table entries, PCB entries...
149 for (i = 0; i < 16; i++) {
150 if (idlist->s6id_list[i] &&
151 idlist->s6id_list[i] != sid->s6id_list[i]) {
153 * An interface zone ID must be the corresponding
154 * interface index by definition.
156 if (i == IPV6_ADDR_SCOPE_INTFACELOCAL &&
157 idlist->s6id_list[i] != ifp->if_index) {
158 IF_AFDATA_WUNLOCK(ifp);
162 if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
163 idlist->s6id_list[i] > V_if_index) {
165 * XXX: theoretically, there should be no
166 * relationship between link IDs and interface
167 * IDs, but we check the consistency for
168 * safety in later use.
170 IF_AFDATA_WUNLOCK(ifp);
175 * XXX: we must need lots of work in this case,
176 * but we simply set the new value in this initial
179 sid->s6id_list[i] = idlist->s6id_list[i];
182 IF_AFDATA_WUNLOCK(ifp);
188 scope6_get(struct ifnet *ifp, struct scope6_id *idlist)
190 struct scope6_id *sid;
192 /* We only need to lock the interface's afdata for SID() to work. */
193 IF_AFDATA_RLOCK(ifp);
195 if (sid == NULL) { /* paranoid? */
196 IF_AFDATA_RUNLOCK(ifp);
202 IF_AFDATA_RUNLOCK(ifp);
208 * Get a scope of the address. Node-local, link-local, site-local or global.
211 in6_addrscope(struct in6_addr *addr)
215 if (addr->s6_addr[0] == 0xfe) {
216 scope = addr->s6_addr[1] & 0xc0;
220 return IPV6_ADDR_SCOPE_LINKLOCAL;
223 return IPV6_ADDR_SCOPE_SITELOCAL;
226 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
232 if (addr->s6_addr[0] == 0xff) {
233 scope = addr->s6_addr[1] & 0x0f;
236 * due to other scope such as reserved,
237 * return scope doesn't work.
240 case IPV6_ADDR_SCOPE_INTFACELOCAL:
241 return IPV6_ADDR_SCOPE_INTFACELOCAL;
243 case IPV6_ADDR_SCOPE_LINKLOCAL:
244 return IPV6_ADDR_SCOPE_LINKLOCAL;
246 case IPV6_ADDR_SCOPE_SITELOCAL:
247 return IPV6_ADDR_SCOPE_SITELOCAL;
250 return IPV6_ADDR_SCOPE_GLOBAL;
256 * Regard loopback and unspecified addresses as global, since
257 * they have no ambiguity.
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? */
266 return IPV6_ADDR_SCOPE_GLOBAL;
270 * ifp - note that this might be NULL
274 scope6_setdefault(struct ifnet *ifp)
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.
285 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] =
287 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
290 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0;
291 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
297 scope6_get_default(struct scope6_id *idlist)
301 *idlist = V_sid_default;
308 scope6_addr2default(struct in6_addr *addr)
313 * special case: The loopback address should be considered as
314 * link-local, but there's no ambiguity in the syntax.
316 if (IN6_IS_ADDR_LOOPBACK(addr))
320 * XXX: 32-bit read is atomic on all our platforms, is it OK
324 id = V_sid_default.s6id_list[in6_addrscope(addr)];
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
338 sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok)
342 if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok)
343 zoneid = scope6_addr2default(&sin6->sin6_addr);
346 (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
347 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) {
349 * At this moment, we only check interface-local and
350 * link-local scope IDs, and use interface indices as the
351 * zone IDs assuming a one-to-one mapping between interfaces
354 if (V_if_index < zoneid || ifnet_byindex(zoneid) == NULL)
357 /* XXX assignment to 16bit from 32bit variable */
358 sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff);
359 sin6->sin6_scope_id = 0;
366 * generate standard sockaddr_in6 from embedded form.
369 sa6_recoverscope(struct sockaddr_in6 *sin6)
371 char ip6buf[INET6_ADDRSTRLEN];
374 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
375 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) {
377 * KAME assumption: link id == interface id
379 zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]);
382 if (V_if_index < zoneid)
385 /* XXX: Disabled due to possible deadlock. */
386 if (!ifnet_byindex(zoneid))
389 if (sin6->sin6_scope_id != 0 &&
390 zoneid != sin6->sin6_scope_id) {
392 "%s: embedded scope mismatch: %s%%%d. "
393 "sin6_scope_id was overridden.", __func__,
394 ip6_sprintf(ip6buf, &sin6->sin6_addr),
395 sin6->sin6_scope_id);
397 sin6->sin6_addr.s6_addr16[1] = 0;
398 sin6->sin6_scope_id = zoneid;
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.
410 * ret_id - unnecessary?
413 in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id)
416 u_int32_t zoneid = 0;
417 struct scope6_id *sid;
420 * special case: the loopback address can only belong to a loopback
423 if (IN6_IS_ADDR_LOOPBACK(in6)) {
424 if (!(ifp->if_flags & IFF_LOOPBACK))
427 scope = in6_addrscope(in6);
428 if (scope == IPV6_ADDR_SCOPE_INTFACELOCAL ||
429 scope == IPV6_ADDR_SCOPE_LINKLOCAL) {
431 * Currently we use interface indeces as the
432 * zone IDs for interface-local and link-local
435 zoneid = ifp->if_index;
436 in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */
437 } else if (scope != IPV6_ADDR_SCOPE_GLOBAL) {
438 IF_AFDATA_RLOCK(ifp);
440 zoneid = sid->s6id_list[scope];
441 IF_AFDATA_RUNLOCK(ifp);
452 * Just clear the embedded scope identifier. Return 0 if the original address
453 * is intact; return non 0 if the address is modified.
456 in6_clearscope(struct in6_addr *in6)
460 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
461 if (in6->s6_addr16[1] != 0)
463 in6->s6_addr16[1] = 0;
470 * Return the scope identifier or zero.
473 in6_getscope(struct in6_addr *in6)
476 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6))
477 return (in6->s6_addr16[1]);