freebsd-dev/sys/netinet6/scope6.c
Hajimu UMEMOTO 3384154590 Sync with recent KAME.
This work was based on kame-20010528-freebsd43-snap.tgz and some
critical problem after the snap was out were fixed.
There are many many changes since last KAME merge.

TODO:
  - The definitions of SADB_* in sys/net/pfkeyv2.h are still different
    from RFC2407/IANA assignment because of binary compatibility
    issue.  It should be fixed under 5-CURRENT.
  - ip6po_m member of struct ip6_pktopts is no longer used.  But, it
    is still there because of binary compatibility issue.  It should
    be removed under 5-CURRENT.

Reviewed by:	itojun
Obtained from:	KAME
MFC after:	3 weeks
2001-06-11 12:39:29 +00:00

304 lines
7.3 KiB
C

/* $FreeBSD$ */
/* $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $ */
/*
* Copyright (C) 2000 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <net/route.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <netinet6/scope6_var.h>
struct scope6_id {
/*
* 16 is correspondent to 4bit multicast scope field.
* i.e. from node-local to global with some reserved/unassigned types.
*/
u_int32_t s6id_list[16];
};
static size_t if_indexlim = 8;
struct scope6_id *scope6_ids = NULL;
void
scope6_ifattach(ifp)
struct ifnet *ifp;
{
int s = splnet();
/*
* We have some arrays that should be indexed by if_index.
* since if_index will grow dynamically, they should grow too.
*/
if (scope6_ids == NULL || if_index >= if_indexlim) {
size_t n;
caddr_t q;
while (if_index >= if_indexlim)
if_indexlim <<= 1;
/* grow scope index array */
n = if_indexlim * sizeof(struct scope6_id);
/* XXX: need new malloc type? */
q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
bzero(q, n);
if (scope6_ids) {
bcopy((caddr_t)scope6_ids, q, n/2);
free((caddr_t)scope6_ids, M_IFADDR);
}
scope6_ids = (struct scope6_id *)q;
}
#define SID scope6_ids[ifp->if_index]
/* don't initialize if called twice */
if (SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]) {
splx(s);
return;
}
/*
* XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
* Should we rather hardcode here?
*/
SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
#ifdef MULTI_SCOPE
/* by default, we don't care about scope boundary for these scopes. */
SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
#endif
#undef SID
splx(s);
}
int
scope6_set(ifp, idlist)
struct ifnet *ifp;
u_int32_t *idlist;
{
int i, s;
int error = 0;
if (scope6_ids == NULL) /* paranoid? */
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...
*/
s = splnet();
for (i = 0; i < 16; i++) {
if (idlist[i] &&
idlist[i] != scope6_ids[ifp->if_index].s6id_list[i]) {
if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
idlist[i] > 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.
*/
splx(s);
return(EINVAL);
}
/*
* XXX: we must need lots of work in this case,
* but we simply set the new value in this initial
* implementation.
*/
scope6_ids[ifp->if_index].s6id_list[i] = idlist[i];
}
}
splx(s);
return(error);
}
int
scope6_get(ifp, idlist)
struct ifnet *ifp;
u_int32_t *idlist;
{
if (scope6_ids == NULL) /* paranoid? */
return(EINVAL);
bcopy(scope6_ids[ifp->if_index].s6id_list, idlist,
sizeof(scope6_ids[ifp->if_index].s6id_list));
return(0);
}
/*
* Get a scope of the address. Node-local, link-local, site-local or global.
*/
int
in6_addrscope(addr)
struct in6_addr *addr;
{
int scope;
if (addr->s6_addr8[0] == 0xfe) {
scope = addr->s6_addr8[1] & 0xc0;
switch (scope) {
case 0x80:
return IPV6_ADDR_SCOPE_LINKLOCAL;
break;
case 0xc0:
return IPV6_ADDR_SCOPE_SITELOCAL;
break;
default:
return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
break;
}
}
if (addr->s6_addr8[0] == 0xff) {
scope = addr->s6_addr8[1] & 0x0f;
/*
* due to other scope such as reserved,
* return scope doesn't work.
*/
switch (scope) {
case IPV6_ADDR_SCOPE_NODELOCAL:
return IPV6_ADDR_SCOPE_NODELOCAL;
break;
case IPV6_ADDR_SCOPE_LINKLOCAL:
return IPV6_ADDR_SCOPE_LINKLOCAL;
break;
case IPV6_ADDR_SCOPE_SITELOCAL:
return IPV6_ADDR_SCOPE_SITELOCAL;
break;
default:
return IPV6_ADDR_SCOPE_GLOBAL;
break;
}
}
if (bcmp(&in6addr_loopback, addr, sizeof(addr) - 1) == 0) {
if (addr->s6_addr8[15] == 1) /* loopback */
return IPV6_ADDR_SCOPE_NODELOCAL;
if (addr->s6_addr8[15] == 0) /* unspecified */
return IPV6_ADDR_SCOPE_LINKLOCAL;
}
return IPV6_ADDR_SCOPE_GLOBAL;
}
int
in6_addr2scopeid(ifp, addr)
struct ifnet *ifp; /* must not be NULL */
struct in6_addr *addr; /* must not be NULL */
{
int scope = in6_addrscope(addr);
if (scope6_ids == NULL) /* paranoid? */
return(0); /* XXX */
if (ifp->if_index >= if_indexlim)
return(0); /* XXX */
#define SID scope6_ids[ifp->if_index]
switch(scope) {
case IPV6_ADDR_SCOPE_NODELOCAL:
return(-1); /* XXX: is this an appropriate value? */
case IPV6_ADDR_SCOPE_LINKLOCAL:
return(SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]);
case IPV6_ADDR_SCOPE_SITELOCAL:
return(SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]);
case IPV6_ADDR_SCOPE_ORGLOCAL:
return(SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]);
default:
return(0); /* XXX: treat as global. */
}
#undef SID
}
void
scope6_setdefault(ifp)
struct ifnet *ifp; /* note that this might be NULL */
{
/*
* Currently, this function just set the default "link" 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.
*/
if (ifp) {
scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
ifp->if_index;
}
else
scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
}
int
scope6_get_default(idlist)
u_int32_t *idlist;
{
if (scope6_ids == NULL) /* paranoid? */
return(EINVAL);
bcopy(scope6_ids[0].s6id_list, idlist,
sizeof(scope6_ids[0].s6id_list));
return(0);
}
u_int32_t
scope6_addr2default(addr)
struct in6_addr *addr;
{
return(scope6_ids[0].s6id_list[in6_addrscope(addr)]);
}