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authorMasahide NAKAMURA <nakam@linux-ipv6.org>2006-08-23 19:12:01 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-09-22 15:06:44 -0700
commite53820de0f81da1429048634cadc6ef5f50c2f8b (patch)
tree7a63689f564c0719a0d4fea2cc5d3b84ea00fbbd /net/ipv6/xfrm6_policy.c
parent9afaca057980c02771f4657c455cc7592fcd7373 (diff)
[XFRM] IPV6: Restrict bundle reusing
For outbound transformation, bundle is checked whether it is suitable for current flow to be reused or not. In such IPv6 case as below, transformation may apply incorrect bundle for the flow instead of creating another bundle: - The policy selector has destination prefix length < 128 (Two or more addresses can be matched it) - Its bundle holds dst entry of default route whose prefix length < 128 (Previous traffic was used such route as next hop) - The policy and the bundle were used a transport mode state and this time flow address is not matched the bundled state. This issue is found by Mobile IPv6 usage to protect mobility signaling by IPsec, but it is not a Mobile IPv6 specific. This patch adds strict check to xfrm_bundle_ok() for each state mode and address when prefix length is less than 128. Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/xfrm6_policy.c')
-rw-r--r--net/ipv6/xfrm6_policy.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index a3f68c8b737e..729b4748d6d3 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -50,7 +50,9 @@ __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
xdst->u.rt6.rt6i_src.plen);
if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
- xfrm_bundle_ok(xdst, fl, AF_INET6)) {
+ xfrm_bundle_ok(xdst, fl, AF_INET6,
+ (xdst->u.rt6.rt6i_dst.plen != 128 ||
+ xdst->u.rt6.rt6i_src.plen != 128))) {
dst_clone(dst);
break;
}