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authorRobert Shearman <rshearma@brocade.com>2015-04-22 11:14:39 +0100
committerDavid S. Miller <davem@davemloft.net>2015-04-22 14:24:54 -0400
commit5a9ab0176198d91dfc153f5e6c5fdc5afa613607 (patch)
treee18ac4586481309da81bc43a30f3677e46a38858 /net/mpls
parent37bde79979c3862c79294c62ddcef7efc477e4bf (diff)
downloadlinux-stericsson-5a9ab0176198d91dfc153f5e6c5fdc5afa613607.tar.gz
mpls: Prevent use of implicit NULL label as outgoing label
The reserved implicit-NULL label isn't allowed to appear in the label stack for packets, so make it an error for the control plane to specify it as an outgoing label. Suggested-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Robert Shearman <rshearma@brocade.com> Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mpls')
-rw-r--r--net/mpls/af_mpls.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 9fdd94cba83e..954810c76a86 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -646,6 +646,15 @@ int nla_get_labels(const struct nlattr *nla,
if ((dec.bos != bos) || dec.ttl || dec.tc)
return -EINVAL;
+ switch (dec.label) {
+ case LABEL_IMPLICIT_NULL:
+ /* RFC3032: This is a label that an LSR may
+ * assign and distribute, but which never
+ * actually appears in the encapsulation.
+ */
+ return -EINVAL;
+ }
+
label[i] = dec.label;
}
*labels = nla_labels;