1#ifndef MPLS_INTERNAL_H
2#define MPLS_INTERNAL_H
3
4struct mpls_shim_hdr {
5	__be32 label_stack_entry;
6};
7
8struct mpls_entry_decoded {
9	u32 label;
10	u8 ttl;
11	u8 tc;
12	u8 bos;
13};
14
15struct mpls_dev {
16	int			input_enabled;
17
18	struct ctl_table_header *sysctl;
19	struct rcu_head		rcu;
20};
21
22struct sk_buff;
23
24static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
25{
26	return (struct mpls_shim_hdr *)skb_network_header(skb);
27}
28
29static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
30{
31	struct mpls_shim_hdr result;
32	result.label_stack_entry =
33		cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
34			    (tc << MPLS_LS_TC_SHIFT) |
35			    (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
36			    (ttl << MPLS_LS_TTL_SHIFT));
37	return result;
38}
39
40static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
41{
42	struct mpls_entry_decoded result;
43	unsigned entry = be32_to_cpu(hdr->label_stack_entry);
44
45	result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
46	result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
47	result.tc =  (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
48	result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
49
50	return result;
51}
52
53int nla_put_labels(struct sk_buff *skb, int attrtype,  u8 labels, const u32 label[]);
54int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels, u32 label[]);
55
56#endif /* MPLS_INTERNAL_H */
57