2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 2000 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $
34 #include <sys/cdefs.h>
35 #include <sys/param.h>
36 #include <sys/malloc.h>
38 #include <sys/socket.h>
39 #include <sys/sockio.h>
40 #include <sys/systm.h>
41 #include <sys/queue.h>
42 #include <sys/sysctl.h>
43 #include <sys/syslog.h>
46 #include <net/if_var.h>
49 #include <netinet/in.h>
51 #include <netinet/ip6.h>
52 #include <netinet6/in6_var.h>
53 #include <netinet6/ip6_var.h>
54 #include <netinet6/scope6_var.h>
56 #ifdef ENABLE_DEFAULT_SCOPE
57 VNET_DEFINE(int, ip6_use_defzone) = 1;
59 VNET_DEFINE(int, ip6_use_defzone) = 0;
61 SYSCTL_DECL(_net_inet6_ip6);
64 * The scope6_lock protects the global sid default stored in
67 static struct mtx scope6_lock;
68 #define SCOPE6_LOCK_INIT() mtx_init(&scope6_lock, "scope6_lock", NULL, MTX_DEF)
69 #define SCOPE6_LOCK() mtx_lock(&scope6_lock)
70 #define SCOPE6_UNLOCK() mtx_unlock(&scope6_lock)
71 #define SCOPE6_LOCK_ASSERT() mtx_assert(&scope6_lock, MA_OWNED)
73 VNET_DEFINE_STATIC(struct scope6_id, sid_default);
74 #define V_sid_default VNET(sid_default)
77 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id)
79 static int scope6_get(struct ifnet *, struct scope6_id *);
80 static int scope6_set(struct ifnet *, struct 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 = malloc(sizeof(*sid), M_IFADDR, M_WAITOK | M_ZERO);
101 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
102 * Should we rather hardcode here?
104 sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index;
105 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
110 scope6_ifdetach(struct scope6_id *sid)
117 scope6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
119 struct in6_ifreq *ifr;
121 if (ifp->if_afdata[AF_INET6] == NULL)
122 return (EPFNOSUPPORT);
124 ifr = (struct in6_ifreq *)data;
127 return (scope6_set(ifp,
128 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
130 return (scope6_get(ifp,
131 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
133 return (scope6_get_default(
134 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
141 scope6_set(struct ifnet *ifp, struct scope6_id *idlist)
145 struct scope6_id *sid = NULL;
147 IF_AFDATA_WLOCK(ifp);
150 if (!sid) { /* paranoid? */
151 IF_AFDATA_WUNLOCK(ifp);
156 * XXX: We need more consistency checks of the relationship among
157 * scopes (e.g. an organization should be larger than a site).
161 * TODO(XXX): after setting, we should reflect the changes to
162 * interface addresses, routing table entries, PCB entries...
165 for (i = 0; i < 16; i++) {
166 if (idlist->s6id_list[i] &&
167 idlist->s6id_list[i] != sid->s6id_list[i]) {
169 * An interface zone ID must be the corresponding
170 * interface index by definition.
172 if (i == IPV6_ADDR_SCOPE_INTFACELOCAL &&
173 idlist->s6id_list[i] != ifp->if_index) {
174 IF_AFDATA_WUNLOCK(ifp);
178 if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
179 idlist->s6id_list[i] > V_if_index) {
181 * XXX: theoretically, there should be no
182 * relationship between link IDs and interface
183 * IDs, but we check the consistency for
184 * safety in later use.
186 IF_AFDATA_WUNLOCK(ifp);
191 * XXX: we must need lots of work in this case,
192 * but we simply set the new value in this initial
195 sid->s6id_list[i] = idlist->s6id_list[i];
198 IF_AFDATA_WUNLOCK(ifp);
204 scope6_get(struct ifnet *ifp, struct scope6_id *idlist)
206 struct epoch_tracker et;
207 struct scope6_id *sid;
209 /* We only need to lock the interface's afdata for SID() to work. */
212 if (sid == NULL) { /* paranoid? */
224 * Get a scope of the address. Node-local, link-local, site-local or global.
227 in6_addrscope(const struct in6_addr *addr)
230 if (IN6_IS_ADDR_MULTICAST(addr)) {
232 * Addresses with reserved value F must be treated as
233 * global multicast addresses.
235 if (IPV6_ADDR_MC_SCOPE(addr) == 0x0f)
236 return (IPV6_ADDR_SCOPE_GLOBAL);
237 return (IPV6_ADDR_MC_SCOPE(addr));
239 if (IN6_IS_ADDR_LINKLOCAL(addr) ||
240 IN6_IS_ADDR_LOOPBACK(addr))
241 return (IPV6_ADDR_SCOPE_LINKLOCAL);
242 if (IN6_IS_ADDR_SITELOCAL(addr))
243 return (IPV6_ADDR_SCOPE_SITELOCAL);
244 return (IPV6_ADDR_SCOPE_GLOBAL);
248 * ifp - note that this might be NULL
252 scope6_setdefault(struct ifnet *ifp)
256 * Currently, this function just sets the default "interfaces"
257 * and "links" according to the given interface.
258 * We might eventually have to separate the notion of "link" from
259 * "interface" and provide a user interface to set the default.
263 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] =
265 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
268 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0;
269 V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
275 scope6_get_default(struct scope6_id *idlist)
279 *idlist = V_sid_default;
286 scope6_addr2default(struct in6_addr *addr)
291 * special case: The loopback address should be considered as
292 * link-local, but there's no ambiguity in the syntax.
294 if (IN6_IS_ADDR_LOOPBACK(addr))
298 * XXX: 32-bit read is atomic on all our platforms, is it OK
302 id = V_sid_default.s6id_list[in6_addrscope(addr)];
308 * Validate the specified scope zone ID in the sin6_scope_id field. If the ID
309 * is unspecified (=0), needs to be specified, and the default zone ID can be
310 * used, the default value will be used.
311 * This routine then generates the kernel-internal form: if the address scope
312 * of is interface-local or link-local, embed the interface index in the
316 sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok)
320 if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok)
321 zoneid = scope6_addr2default(&sin6->sin6_addr);
324 (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
325 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) {
327 * At this moment, we only check interface-local and
328 * link-local scope IDs, and use interface indices as the
329 * zone IDs assuming a one-to-one mapping between interfaces
332 if (V_if_index < zoneid || ifnet_byindex(zoneid) == NULL)
335 /* XXX assignment to 16bit from 32bit variable */
336 sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff);
337 sin6->sin6_scope_id = 0;
344 * generate standard sockaddr_in6 from embedded form.
347 sa6_recoverscope(struct sockaddr_in6 *sin6)
349 char ip6buf[INET6_ADDRSTRLEN];
352 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
353 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) {
355 * KAME assumption: link id == interface id
357 zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]);
360 if (V_if_index < zoneid)
363 /* XXX: Disabled due to possible deadlock. */
364 if (!ifnet_byindex(zoneid))
367 if (sin6->sin6_scope_id != 0 &&
368 zoneid != sin6->sin6_scope_id) {
370 "%s: embedded scope mismatch: %s%%%d. "
371 "sin6_scope_id was overridden\n", __func__,
372 ip6_sprintf(ip6buf, &sin6->sin6_addr),
373 sin6->sin6_scope_id);
375 sin6->sin6_addr.s6_addr16[1] = 0;
376 sin6->sin6_scope_id = zoneid;
384 * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is
385 * non NULL, it is set to the zone ID. If the zone ID needs to be embedded
386 * in the in6_addr structure, in6 will be modified.
388 * ret_id - unnecessary?
391 in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id)
394 u_int32_t zoneid = 0;
395 struct scope6_id *sid;
398 * special case: the loopback address can only belong to a loopback
401 if (IN6_IS_ADDR_LOOPBACK(in6)) {
402 if (!(ifp->if_flags & IFF_LOOPBACK))
405 scope = in6_addrscope(in6);
406 if (scope == IPV6_ADDR_SCOPE_INTFACELOCAL ||
407 scope == IPV6_ADDR_SCOPE_LINKLOCAL) {
409 * Currently we use interface indices as the
410 * zone IDs for interface-local and link-local
413 zoneid = ifp->if_index;
414 in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */
415 } else if (scope != IPV6_ADDR_SCOPE_GLOBAL) {
416 struct epoch_tracker et;
419 if (ifp->if_afdata[AF_INET6] == NULL) {
424 zoneid = sid->s6id_list[scope];
436 * Just clear the embedded scope identifier. Return 0 if the original address
437 * is intact; return non 0 if the address is modified.
440 in6_clearscope(struct in6_addr *in6)
444 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
445 if (in6->s6_addr16[1] != 0)
447 in6->s6_addr16[1] = 0;
454 * Return the scope identifier or zero.
457 in6_getscope(const struct in6_addr *in6)
460 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6))
461 return (in6->s6_addr16[1]);
467 * Returns scope zone id for the unicast address @in6.
469 * Returns 0 for global unicast and loopback addresses.
470 * Returns interface index for the link-local addresses.
473 in6_get_unicast_scopeid(const struct in6_addr *in6, const struct ifnet *ifp)
476 if (IN6_IS_SCOPE_LINKLOCAL(in6))
477 return (ifp->if_index);
482 in6_set_unicast_scopeid(struct in6_addr *in6, uint32_t scopeid)
485 in6->s6_addr16[1] = htons(scopeid & 0xffff);
489 * Return pointer to ifnet structure, corresponding to the zone id of
493 in6_getlinkifnet(uint32_t zoneid)
496 return (ifnet_byindex((u_short)zoneid));
500 * Return zone id for the specified scope.
503 in6_getscopezone(const struct ifnet *ifp, int scope)
506 if (scope == IPV6_ADDR_SCOPE_INTFACELOCAL ||
507 scope == IPV6_ADDR_SCOPE_LINKLOCAL)
508 return (ifp->if_index);
509 if (scope >= 0 && scope < IPV6_ADDR_SCOPES_COUNT)
510 return (SID(ifp)->s6id_list[scope]);
515 * Extracts scope from adddress @dst, stores cleared address
516 * inside @dst and zone inside @scopeid
519 in6_splitscope(const struct in6_addr *src, struct in6_addr *dst,
525 zoneid = ntohs(in6_getscope(dst));
531 * This function is for checking sockaddr_in6 structure passed
532 * from the application level (usually).
534 * sin6_scope_id should be set for link-local unicast, link-local and
535 * interface-local multicast addresses.
537 * If it is zero, then look into default zone ids. If default zone id is
538 * not set or disabled, then return error.
541 sa6_checkzone(struct sockaddr_in6 *sa6)
545 scope = in6_addrscope(&sa6->sin6_addr);
546 if (scope == IPV6_ADDR_SCOPE_GLOBAL)
547 return (sa6->sin6_scope_id ? EINVAL: 0);
548 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr) &&
549 scope != IPV6_ADDR_SCOPE_LINKLOCAL &&
550 scope != IPV6_ADDR_SCOPE_INTFACELOCAL) {
551 if (sa6->sin6_scope_id == 0 && V_ip6_use_defzone != 0)
552 sa6->sin6_scope_id = V_sid_default.s6id_list[scope];
556 * Since ::1 address always configured on the lo0, we can
557 * automatically set its zone id, when it is not specified.
558 * Return error, when specified zone id doesn't match with
561 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr)) {
562 if (sa6->sin6_scope_id == 0)
563 sa6->sin6_scope_id = in6_getscopezone(V_loif, scope);
564 else if (sa6->sin6_scope_id != in6_getscopezone(V_loif, scope))
565 return (EADDRNOTAVAIL);
567 /* XXX: we can validate sin6_scope_id here */
568 if (sa6->sin6_scope_id != 0)
570 if (V_ip6_use_defzone != 0)
571 sa6->sin6_scope_id = V_sid_default.s6id_list[scope];
572 /* Return error if we can't determine zone id */
573 return (sa6->sin6_scope_id ? 0: EADDRNOTAVAIL);
577 * This function is similar to sa6_checkzone, but it uses given ifp
578 * to initialize sin6_scope_id.
581 sa6_checkzone_ifp(struct ifnet *ifp, struct sockaddr_in6 *sa6)
585 scope = in6_addrscope(&sa6->sin6_addr);
586 if (scope == IPV6_ADDR_SCOPE_LINKLOCAL ||
587 scope == IPV6_ADDR_SCOPE_INTFACELOCAL) {
588 if (sa6->sin6_scope_id == 0) {
589 sa6->sin6_scope_id = in6_getscopezone(ifp, scope);
591 } else if (sa6->sin6_scope_id != in6_getscopezone(ifp, scope))
592 return (EADDRNOTAVAIL);
594 return (sa6_checkzone(sa6));