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 1.2 2003/06/17 04:28:53 dillon 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)
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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;
66 * We have some arrays that should be indexed by if_index.
67 * since if_index will grow dynamically, they should grow too.
69 if (scope6_ids == NULL || if_index >= if_indexlim) {
73 while (if_index >= if_indexlim)
76 /* grow scope index array */
77 n = if_indexlim * sizeof(struct scope6_id);
78 /* XXX: need new malloc type? */
79 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
82 bcopy((caddr_t)scope6_ids, q, n/2);
83 free((caddr_t)scope6_ids, M_IFADDR);
85 scope6_ids = (struct scope6_id *)q;
88 #define SID scope6_ids[ifp->if_index]
90 /* don't initialize if called twice */
91 if (SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]) {
97 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
98 * Should we rather hardcode here?
100 SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
102 /* by default, we don't care about scope boundary for these scopes. */
103 SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
104 SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
112 scope6_set(ifp, idlist)
119 if (scope6_ids == NULL) /* paranoid? */
123 * XXX: We need more consistency checks of the relationship among
124 * scopes (e.g. an organization should be larger than a site).
128 * TODO(XXX): after setting, we should reflect the changes to
129 * interface addresses, routing table entries, PCB entries...
134 for (i = 0; i < 16; i++) {
136 idlist[i] != scope6_ids[ifp->if_index].s6id_list[i]) {
137 if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
138 idlist[i] > if_index) {
140 * XXX: theoretically, there should be no
141 * relationship between link IDs and interface
142 * IDs, but we check the consistency for
143 * safety in later use.
150 * XXX: we must need lots of work in this case,
151 * but we simply set the new value in this initial
154 scope6_ids[ifp->if_index].s6id_list[i] = idlist[i];
163 scope6_get(ifp, idlist)
167 if (scope6_ids == NULL) /* paranoid? */
170 bcopy(scope6_ids[ifp->if_index].s6id_list, idlist,
171 sizeof(scope6_ids[ifp->if_index].s6id_list));
178 * Get a scope of the address. Node-local, link-local, site-local or global.
182 struct in6_addr *addr;
186 if (addr->s6_addr8[0] == 0xfe) {
187 scope = addr->s6_addr8[1] & 0xc0;
191 return IPV6_ADDR_SCOPE_LINKLOCAL;
194 return IPV6_ADDR_SCOPE_SITELOCAL;
197 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
203 if (addr->s6_addr8[0] == 0xff) {
204 scope = addr->s6_addr8[1] & 0x0f;
207 * due to other scope such as reserved,
208 * return scope doesn't work.
211 case IPV6_ADDR_SCOPE_NODELOCAL:
212 return IPV6_ADDR_SCOPE_NODELOCAL;
214 case IPV6_ADDR_SCOPE_LINKLOCAL:
215 return IPV6_ADDR_SCOPE_LINKLOCAL;
217 case IPV6_ADDR_SCOPE_SITELOCAL:
218 return IPV6_ADDR_SCOPE_SITELOCAL;
221 return IPV6_ADDR_SCOPE_GLOBAL;
226 if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
227 if (addr->s6_addr8[15] == 1) /* loopback */
228 return IPV6_ADDR_SCOPE_NODELOCAL;
229 if (addr->s6_addr8[15] == 0) /* unspecified */
230 return IPV6_ADDR_SCOPE_LINKLOCAL;
233 return IPV6_ADDR_SCOPE_GLOBAL;
237 in6_addr2scopeid(ifp, addr)
238 struct ifnet *ifp; /* must not be NULL */
239 struct in6_addr *addr; /* must not be NULL */
241 int scope = in6_addrscope(addr);
243 if (scope6_ids == NULL) /* paranoid? */
245 if (ifp->if_index >= if_indexlim)
248 #define SID scope6_ids[ifp->if_index]
250 case IPV6_ADDR_SCOPE_NODELOCAL:
251 return(-1); /* XXX: is this an appropriate value? */
253 case IPV6_ADDR_SCOPE_LINKLOCAL:
254 return(SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]);
256 case IPV6_ADDR_SCOPE_SITELOCAL:
257 return(SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]);
259 case IPV6_ADDR_SCOPE_ORGLOCAL:
260 return(SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]);
263 return(0); /* XXX: treat as global. */
269 scope6_setdefault(ifp)
270 struct ifnet *ifp; /* note that this might be NULL */
273 * Currently, this function just set the default "link" according to
274 * 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 scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
283 scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
287 scope6_get_default(idlist)
290 if (scope6_ids == NULL) /* paranoid? */
293 bcopy(scope6_ids[0].s6id_list, idlist,
294 sizeof(scope6_ids[0].s6id_list));
300 scope6_addr2default(addr)
301 struct in6_addr *addr;
303 return(scope6_ids[0].s6id_list[in6_addrscope(addr)]);