1 files changed, 59 insertions, 0 deletions

diff --git a/net/mpls/internal.h b/net/mpls/internal.h
new file mode 100644
index 000000000000..fb6de92052c4
--- /dev/null
+++ b/net/mpls/internal.h
@@ -0,0 +1,59 @@
+#ifndef MPLS_INTERNAL_H
+#define MPLS_INTERNAL_H
+
+#define LABEL_IPV4_EXPLICIT_NULL        0 /* RFC3032 */
+#define LABEL_ROUTER_ALERT_LABEL        1 /* RFC3032 */
+#define LABEL_IPV6_EXPLICIT_NULL        2 /* RFC3032 */
+#define LABEL_IMPLICIT_NULL             3 /* RFC3032 */
+#define LABEL_ENTROPY_INDICATOR         7 /* RFC6790 */
+#define LABEL_GAL                       13 /* RFC5586 */
+#define LABEL_OAM_ALERT                 14 /* RFC3429 */
+#define LABEL_EXTENSION                 15 /* RFC7274 */
+
+
+struct mpls_shim_hdr {
+        __be32 label_stack_entry;
+};
+
+struct mpls_entry_decoded {
+        u32 label;
+        u8 ttl;
+        u8 tc;
+        u8 bos;
+};
+
+struct sk_buff;
+
+static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
+{
+        return (struct mpls_shim_hdr *)skb_network_header(skb);
+}
+
+static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
+{
+        struct mpls_shim_hdr result;
+        result.label_stack_entry =
+                cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
+                            (tc << MPLS_LS_TC_SHIFT) |
+                            (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
+                            (ttl << MPLS_LS_TTL_SHIFT));
+        return result;
+}
+
+static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
+{
+        struct mpls_entry_decoded result;
+        unsigned entry = be32_to_cpu(hdr->label_stack_entry);
+
+        result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
+        result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
+        result.tc =  (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
+        result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
+
+        return result;
+}
+
+int nla_put_labels(struct sk_buff *skb, int attrtype,  u8 labels, const u32 label[]);
+int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels, u32 label[]);
+
+#endif /* MPLS_INTERNAL_H */