blob: 2681a4ba6c375f3faf83498150350ddea7392ccc [file] [log] [blame]
Eric W. Biederman01891972015-03-03 19:10:47 -06001#ifndef MPLS_INTERNAL_H
2#define MPLS_INTERNAL_H
3
Eric W. Biederman01891972015-03-03 19:10:47 -06004struct 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
Robert Shearman03c57742015-04-22 11:14:37 +010015struct mpls_dev {
Robert Shearman37bde792015-04-22 11:14:38 +010016 int input_enabled;
17
18 struct ctl_table_header *sysctl;
Robert Shearman25cc8f02015-06-05 18:54:45 +010019 struct rcu_head rcu;
Robert Shearman03c57742015-04-22 11:14:37 +010020};
21
Eric W. Biederman01891972015-03-03 19:10:47 -060022struct 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
Roopa Prabhuface0182015-07-21 10:43:52 +020053int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
54 const u32 label[]);
55int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels,
56 u32 label[]);
57bool mpls_output_possible(const struct net_device *dev);
58unsigned int mpls_dev_mtu(const struct net_device *dev);
59bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
Eric W. Biederman966bae32015-03-03 19:13:19 -060060
Eric W. Biederman01891972015-03-03 19:10:47 -060061#endif /* MPLS_INTERNAL_H */