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 {
28 struct ctl_table_header *sysctl;
33 static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
35 return (struct mpls_shim_hdr *)skb_network_header(skb);
38 static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
40 struct mpls_shim_hdr result;
41 result.label_stack_entry =
42 cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
43 (tc << MPLS_LS_TC_SHIFT) |
44 (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
45 (ttl << MPLS_LS_TTL_SHIFT));
49 static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
51 struct mpls_entry_decoded result;
52 unsigned entry = be32_to_cpu(hdr->label_stack_entry);
54 result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
55 result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
56 result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
57 result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
62 int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, const u32 label[]);
63 int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels, u32 label[]);
65 #endif /* MPLS_INTERNAL_H */