diff options
| author | Robert Shearman <[email protected]> | 2015-04-22 11:14:39 +0100 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2015-04-22 14:24:54 -0400 |
| commit | 5a9ab0176198d91dfc153f5e6c5fdc5afa613607 (patch) | |
| tree | e18ac4586481309da81bc43a30f3677e46a38858 | |
| parent | 37bde79979c3862c79294c62ddcef7efc477e4bf (diff) | |
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" <[email protected]>
Signed-off-by: Robert Shearman <[email protected]>
Reviewed-by: "Eric W. Biederman" <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
| -rw-r--r-- | net/mpls/af_mpls.c | 9 |
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; |