1 #ifndef MPLS_INTERNAL_H
2 #define MPLS_INTERNAL_H
4 #define LABEL_IPV4_EXPLICIT_NULL 0 /* RFC3032 */
5 #define LABEL_ROUTER_ALERT_LABEL 1 /* RFC3032 */
6 #define LABEL_IPV6_EXPLICIT_NULL 2 /* RFC3032 */
7 #define LABEL_IMPLICIT_NULL 3 /* RFC3032 */
8 #define LABEL_ENTROPY_INDICATOR 7 /* RFC6790 */
9 #define LABEL_GAL 13 /* RFC5586 */
10 #define LABEL_OAM_ALERT 14 /* RFC3429 */
11 #define LABEL_EXTENSION 15 /* RFC7274 */
14 struct mpls_shim_hdr {
15 __be32 label_stack_entry;
18 struct mpls_entry_decoded {
30 static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
32 return (struct mpls_shim_hdr *)skb_network_header(skb);
35 static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
37 struct mpls_shim_hdr result;
38 result.label_stack_entry =
39 cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
40 (tc << MPLS_LS_TC_SHIFT) |
41 (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
42 (ttl << MPLS_LS_TTL_SHIFT));
46 static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
48 struct mpls_entry_decoded result;
49 unsigned entry = be32_to_cpu(hdr->label_stack_entry);
51 result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
52 result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
53 result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
54 result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
59 int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, const u32 label[]);
60 int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels, u32 label[]);
62 #endif /* MPLS_INTERNAL_H */