1 /* $FreeBSD: src/sys/netinet6/scope6.c,v 1.1.2.3 2002/04/01 15:29:04 ume Exp $ */
2 /* $DragonFly: src/sys/netinet6/scope6.c,v 1.11 2008/01/05 14:02:40 swildner Exp $ */
3 /* $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $ */
6 * Copyright (C) 2000 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/param.h>
35 #include <sys/malloc.h>
37 #include <sys/socket.h>
38 #include <sys/systm.h>
39 #include <sys/queue.h>
40 #include <sys/thread2.h>
42 #include <net/route.h>
45 #include <netinet/in.h>
47 #include <netinet6/in6_var.h>
48 #include <netinet6/scope6_var.h>
50 static struct scope6_id sid_default;
54 SID(struct ifnet *ifp)
56 struct in6_ifextra *xtra;
58 xtra = ifp->if_afdata[AF_INET6];
60 return (xtra->scope6_id);
67 bzero(&sid_default, sizeof(sid_default));
71 scope6_ifattach(struct ifnet *ifp)
73 struct scope6_id *sid;
75 sid = (struct scope6_id *)kmalloc(sizeof(*sid), M_IFADDR,
81 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
82 * Should we rather hardcode here?
84 sid->s6id_list[IPV6_ADDR_SCOPE_NODELOCAL] = ifp->if_index;
85 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
87 /* by default, we don't care about scope boundary for these scopes. */
88 sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
89 sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
97 scope6_ifdetach(struct scope6_id *sid)
103 scope6_set(struct ifnet *ifp, struct scope6_id *idlist)
107 struct scope6_id *sid = SID(ifp);
109 if (!sid) /* paranoid? */
113 * XXX: We need more consistency checks of the relationship among
114 * scopes (e.g. an organization should be larger than a site).
118 * TODO(XXX): after setting, we should reflect the changes to
119 * interface addresses, routing table entries, PCB entries...
124 for (i = 0; i < 16; i++) {
125 if (idlist->s6id_list[i] &&
126 idlist->s6id_list[i] != sid->s6id_list[i]) {
127 if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
128 idlist->s6id_list[i] > if_index) {
130 * XXX: theoretically, there should be no
131 * relationship between link IDs and interface
132 * IDs, but we check the consistency for
133 * safety in later use.
140 * XXX: we must need lots of work in this case,
141 * but we simply set the new value in this initial
144 sid->s6id_list[i] = idlist->s6id_list[i];
153 scope6_get(struct ifnet *ifp, struct scope6_id *idlist)
155 struct scope6_id *sid = SID(ifp);
157 if (sid == NULL) /* paranoid? */
167 * Get a scope of the address. Node-local, link-local, site-local or global.
170 in6_addrscope(struct in6_addr *addr)
174 if (addr->s6_addr8[0] == 0xfe) {
175 scope = addr->s6_addr8[1] & 0xc0;
179 return IPV6_ADDR_SCOPE_LINKLOCAL;
182 return IPV6_ADDR_SCOPE_SITELOCAL;
185 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
191 if (addr->s6_addr8[0] == 0xff) {
192 scope = addr->s6_addr8[1] & 0x0f;
195 * due to other scope such as reserved,
196 * return scope doesn't work.
199 case IPV6_ADDR_SCOPE_NODELOCAL:
200 return IPV6_ADDR_SCOPE_NODELOCAL;
202 case IPV6_ADDR_SCOPE_LINKLOCAL:
203 return IPV6_ADDR_SCOPE_LINKLOCAL;
205 case IPV6_ADDR_SCOPE_SITELOCAL:
206 return IPV6_ADDR_SCOPE_SITELOCAL;
209 return IPV6_ADDR_SCOPE_GLOBAL;
214 if (bcmp(&kin6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
215 if (addr->s6_addr8[15] == 1) /* loopback */
216 return IPV6_ADDR_SCOPE_NODELOCAL;
217 if (addr->s6_addr8[15] == 0) /* unspecified */
218 return IPV6_ADDR_SCOPE_LINKLOCAL;
221 return IPV6_ADDR_SCOPE_GLOBAL;
225 in6_addr2scopeid(struct ifnet *ifp, /* must not be NULL */
226 struct in6_addr *addr) /* must not be NULL */
229 struct scope6_id *sid = SID(ifp);
232 if (sid == NULL) { /* should not happen */
233 panic("in6_addr2zoneid: scope array is NULL");
239 * special case: the loopback address can only belong to a loopback
242 if (IN6_IS_ADDR_LOOPBACK(addr)) {
243 if (!(ifp->if_flags & IFF_LOOPBACK))
246 return (0); /* there's no ambiguity */
249 scope = in6_addrscope(addr);
252 case IPV6_ADDR_SCOPE_NODELOCAL:
253 return (-1); /* XXX: is this an appropriate value? */
255 case IPV6_ADDR_SCOPE_LINKLOCAL:
256 return (sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]);
258 case IPV6_ADDR_SCOPE_SITELOCAL:
259 return (sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]);
261 case IPV6_ADDR_SCOPE_ORGLOCAL:
262 return (sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]);
265 return (0); /* XXX: treat as global. */
270 scope6_setdefault(struct ifnet *ifp) /* note that this might be NULL */
273 * Currently, this function just set the default "interfaces"
274 * and "links" according to the given interface.
275 * We might eventually have to separate the notion of "link" from
276 * "interface" and provide a user interface to set the default.
279 sid_default.s6id_list[IPV6_ADDR_SCOPE_NODELOCAL] =
281 sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
284 sid_default.s6id_list[IPV6_ADDR_SCOPE_NODELOCAL] = 0;
285 sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
290 scope6_get_default(struct scope6_id *idlist)
292 *idlist = sid_default;
298 scope6_addr2default(struct in6_addr *addr)
301 * special case: The loopback address should be considered as
302 * link-local, but there's no ambiguity in the syntax.
304 if (IN6_IS_ADDR_LOOPBACK(addr))
307 return (sid_default.s6id_list[in6_addrscope(addr)]);
311 * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is
312 * non NULL, it is set to the zone ID. If the zone ID needs to be embedded
313 * in the in6_addr structure, in6 will be modified.
316 in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id)
319 u_int32_t zoneid = 0;
320 struct scope6_id *sid;
322 ifnet_serialize_all(ifp);
327 if (sid == NULL) { /* should not happen */
328 panic("in6_setscope: scope array is NULL");
334 * special case: the loopback address can only belong to a loopback
337 if (IN6_IS_ADDR_LOOPBACK(in6)) {
338 if (!(ifp->if_flags & IFF_LOOPBACK)) {
339 ifnet_deserialize_all(ifp);
343 *ret_id = 0; /* there's no ambiguity */
344 ifnet_deserialize_all(ifp);
349 scope = in6_addrscope(in6);
352 case IPV6_ADDR_SCOPE_NODELOCAL: /* should be interface index */
353 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_NODELOCAL];
356 case IPV6_ADDR_SCOPE_LINKLOCAL:
357 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL];
360 case IPV6_ADDR_SCOPE_SITELOCAL:
361 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL];
364 case IPV6_ADDR_SCOPE_ORGLOCAL:
365 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL];
369 zoneid = 0; /* XXX: treat as global. */
373 ifnet_deserialize_all(ifp);
378 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_NODELOCAL(in6) )
379 in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */