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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>
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@ -646,6 +646,15 @@ int nla_get_labels(const struct nlattr *nla,
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if ((dec.bos != bos) || dec.ttl || dec.tc)
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return -EINVAL;
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switch (dec.label) {
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case LABEL_IMPLICIT_NULL:
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/* RFC3032: This is a label that an LSR may
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* assign and distribute, but which never
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* actually appears in the encapsulation.
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*/
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return -EINVAL;
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}
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label[i] = dec.label;
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}
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*labels = nla_labels;
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