Commit 5a9ab017 authored by Robert Shearman's avatar Robert Shearman Committed by David S. Miller

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: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarRobert Shearman <rshearma@brocade.com>
Reviewed-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 37bde799
...@@ -646,6 +646,15 @@ int nla_get_labels(const struct nlattr *nla, ...@@ -646,6 +646,15 @@ int nla_get_labels(const struct nlattr *nla,
if ((dec.bos != bos) || dec.ttl || dec.tc) if ((dec.bos != bos) || dec.ttl || dec.tc)
return -EINVAL; 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; label[i] = dec.label;
} }
*labels = nla_labels; *labels = nla_labels;
......
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