u_int32_t
scope6_addr2default(struct in6_addr *addr)
{
u_int32_t id;
/*
* special case: The loopback address should be considered as
* link-local, but there's no ambiguity in the syntax.
*/
if (IN6_IS_ADDR_LOOPBACK(addr))
return (0);
/*
* XXX: 32-bit read is atomic on all our platforms, is it OK
* not to lock here?
*/
SCOPE6_LOCK();
id = V_sid_default.s6id_list[in6_addrscope(addr)];
SCOPE6_UNLOCK();
return (id);
}
void
scope6_setdefault(struct ifnet *ifp)
{
/*
* Currently, this function just sets the default "interfaces"
* and "links" according to the given interface.
* We might eventually have to separate the notion of "link" from
* "interface" and provide a user interface to set the default.
*/
SCOPE6_LOCK();
if (ifp) {
V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] =
ifp->if_index;
V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
ifp->if_index;
} else {
V_sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0;
V_sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
}
SCOPE6_UNLOCK();
}
/*
* Determine the appropriate scope zone ID for in6 and ifp. If ret_id is
* non NULL, it is set to the zone ID. If the zone ID needs to be embedded
* in the in6_addr structure, in6 will be modified.
*
* ret_id - unnecessary?
*/
int
in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id)
{
int scope;
u_int32_t zoneid = 0;
struct scope6_id *sid;
IF_AFDATA_LOCK(ifp);
sid = SID(ifp);
#ifdef DIAGNOSTIC
if (sid == NULL) { /* should not happen */
panic("in6_setscope: scope array is NULL");
/* NOTREACHED */
}
#endif
/*
* special case: the loopback address can only belong to a loopback
* interface.
*/
if (IN6_IS_ADDR_LOOPBACK(in6)) {
if (!(ifp->if_flags & IFF_LOOPBACK)) {
IF_AFDATA_UNLOCK(ifp);
return (EINVAL);
} else {
if (ret_id != NULL)
*ret_id = 0; /* there's no ambiguity */
IF_AFDATA_UNLOCK(ifp);
return (0);
}
}
scope = in6_addrscope(in6);
SCOPE6_LOCK();
switch (scope) {
case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */
zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL];
break;
case IPV6_ADDR_SCOPE_LINKLOCAL:
zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL];
break;
case IPV6_ADDR_SCOPE_SITELOCAL:
zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL];
break;
case IPV6_ADDR_SCOPE_ORGLOCAL:
zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL];
break;
default:
zoneid = 0; /* XXX: treat as global. */
break;
}
SCOPE6_UNLOCK();
IF_AFDATA_UNLOCK(ifp);
if (ret_id != NULL)
*ret_id = zoneid;
if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6))
in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */
return (0);
}
int
scope6_set(struct ifnet *ifp, struct scope6_id *idlist)
{
int i;
int error = 0;
struct scope6_id *sid = NULL;
IF_AFDATA_LOCK(ifp);
sid = SID(ifp);
if (!sid) { /* paranoid? */
IF_AFDATA_UNLOCK(ifp);
return (EINVAL);
}
/*
* XXX: We need more consistency checks of the relationship among
* scopes (e.g. an organization should be larger than a site).
*/
/*
* TODO(XXX): after setting, we should reflect the changes to
* interface addresses, routing table entries, PCB entries...
*/
SCOPE6_LOCK();
for (i = 0; i < 16; i++) {
if (idlist->s6id_list[i] &&
idlist->s6id_list[i] != sid->s6id_list[i]) {
/*
* An interface zone ID must be the corresponding
* interface index by definition.
*/
if (i == IPV6_ADDR_SCOPE_INTFACELOCAL &&
idlist->s6id_list[i] != ifp->if_index) {
IF_AFDATA_UNLOCK(ifp);
SCOPE6_UNLOCK();
return (EINVAL);
}
if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
idlist->s6id_list[i] > V_if_index) {
/*
* XXX: theoretically, there should be no
* relationship between link IDs and interface
* IDs, but we check the consistency for
* safety in later use.
*/
IF_AFDATA_UNLOCK(ifp);
SCOPE6_UNLOCK();
return (EINVAL);
}
/*
* XXX: we must need lots of work in this case,
* but we simply set the new value in this initial
* implementation.
*/
sid->s6id_list[i] = idlist->s6id_list[i];
}
}
SCOPE6_UNLOCK();
IF_AFDATA_UNLOCK(ifp);
return (error);
}
