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 1.3 2004/05/20 18:30:36 cpressey 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
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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>
41 #include <net/route.h>
44 #include <netinet/in.h>
46 #include <netinet6/in6_var.h>
47 #include <netinet6/scope6_var.h>
51 * 16 is correspondent to 4bit multicast scope field.
52 * i.e. from node-local to global with some reserved/unassigned types.
54 u_int32_t s6id_list[16];
56 static size_t if_indexlim = 8;
57 struct scope6_id *scope6_ids = NULL;
60 scope6_ifattach(struct ifnet *ifp)
65 * We have some arrays that should be indexed by if_index.
66 * since if_index will grow dynamically, they should grow too.
68 if (scope6_ids == NULL || if_index >= if_indexlim) {
72 while (if_index >= if_indexlim)
75 /* grow scope index array */
76 n = if_indexlim * sizeof(struct scope6_id);
77 /* XXX: need new malloc type? */
78 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
81 bcopy((caddr_t)scope6_ids, q, n/2);
82 free((caddr_t)scope6_ids, M_IFADDR);
84 scope6_ids = (struct scope6_id *)q;
87 #define SID scope6_ids[ifp->if_index]
89 /* don't initialize if called twice */
90 if (SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]) {
96 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
97 * Should we rather hardcode here?
99 SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
101 /* by default, we don't care about scope boundary for these scopes. */
102 SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
103 SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
111 scope6_set(struct ifnet *ifp, u_int32_t *idlist)
116 if (scope6_ids == NULL) /* paranoid? */
120 * XXX: We need more consistency checks of the relationship among
121 * scopes (e.g. an organization should be larger than a site).
125 * TODO(XXX): after setting, we should reflect the changes to
126 * interface addresses, routing table entries, PCB entries...
131 for (i = 0; i < 16; i++) {
133 idlist[i] != scope6_ids[ifp->if_index].s6id_list[i]) {
134 if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
135 idlist[i] > if_index) {
137 * XXX: theoretically, there should be no
138 * relationship between link IDs and interface
139 * IDs, but we check the consistency for
140 * safety in later use.
147 * XXX: we must need lots of work in this case,
148 * but we simply set the new value in this initial
151 scope6_ids[ifp->if_index].s6id_list[i] = idlist[i];
160 scope6_get(struct ifnet *ifp, u_int32_t *idlist)
162 if (scope6_ids == NULL) /* paranoid? */
165 bcopy(scope6_ids[ifp->if_index].s6id_list, idlist,
166 sizeof(scope6_ids[ifp->if_index].s6id_list));
173 * Get a scope of the address. Node-local, link-local, site-local or global.
176 in6_addrscope(struct in6_addr *addr)
180 if (addr->s6_addr8[0] == 0xfe) {
181 scope = addr->s6_addr8[1] & 0xc0;
185 return IPV6_ADDR_SCOPE_LINKLOCAL;
188 return IPV6_ADDR_SCOPE_SITELOCAL;
191 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
197 if (addr->s6_addr8[0] == 0xff) {
198 scope = addr->s6_addr8[1] & 0x0f;
201 * due to other scope such as reserved,
202 * return scope doesn't work.
205 case IPV6_ADDR_SCOPE_NODELOCAL:
206 return IPV6_ADDR_SCOPE_NODELOCAL;
208 case IPV6_ADDR_SCOPE_LINKLOCAL:
209 return IPV6_ADDR_SCOPE_LINKLOCAL;
211 case IPV6_ADDR_SCOPE_SITELOCAL:
212 return IPV6_ADDR_SCOPE_SITELOCAL;
215 return IPV6_ADDR_SCOPE_GLOBAL;
220 if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
221 if (addr->s6_addr8[15] == 1) /* loopback */
222 return IPV6_ADDR_SCOPE_NODELOCAL;
223 if (addr->s6_addr8[15] == 0) /* unspecified */
224 return IPV6_ADDR_SCOPE_LINKLOCAL;
227 return IPV6_ADDR_SCOPE_GLOBAL;
231 in6_addr2scopeid(struct ifnet *ifp, /* must not be NULL */
232 struct in6_addr *addr) /* must not be NULL */
234 int scope = in6_addrscope(addr);
236 if (scope6_ids == NULL) /* paranoid? */
238 if (ifp->if_index >= if_indexlim)
241 #define SID scope6_ids[ifp->if_index]
243 case IPV6_ADDR_SCOPE_NODELOCAL:
244 return(-1); /* XXX: is this an appropriate value? */
246 case IPV6_ADDR_SCOPE_LINKLOCAL:
247 return(SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]);
249 case IPV6_ADDR_SCOPE_SITELOCAL:
250 return(SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]);
252 case IPV6_ADDR_SCOPE_ORGLOCAL:
253 return(SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]);
256 return(0); /* XXX: treat as global. */
262 scope6_setdefault(struct ifnet *ifp) /* note that this might be NULL */
265 * Currently, this function just set the default "link" according to
266 * the given interface.
267 * We might eventually have to separate the notion of "link" from
268 * "interface" and provide a user interface to set the default.
271 scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
275 scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
279 scope6_get_default(u_int32_t *idlist)
281 if (scope6_ids == NULL) /* paranoid? */
284 bcopy(scope6_ids[0].s6id_list, idlist,
285 sizeof(scope6_ids[0].s6id_list));
291 scope6_addr2default(struct in6_addr *addr)
293 return(scope6_ids[0].s6id_list[in6_addrscope(addr)]);