Robert Shearman <rshea...@brocade.com> writes:
> 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.
Reviewed-by: "Eric W. Biederman" <ebied...@xmission.com>
>
> Suggested-by: "Eric W. Biederman" <ebied...@xmission.com>
> Signed-off-by: Robert Shearman <rshea...@brocade.com>
> ---
> net/mpls/af_mpls.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> 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;
--
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