66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
#ifndef MPLS_INTERNAL_H
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#define MPLS_INTERNAL_H
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#define LABEL_IPV4_EXPLICIT_NULL 0 /* RFC3032 */
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#define LABEL_ROUTER_ALERT_LABEL 1 /* RFC3032 */
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#define LABEL_IPV6_EXPLICIT_NULL 2 /* RFC3032 */
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#define LABEL_IMPLICIT_NULL 3 /* RFC3032 */
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#define LABEL_ENTROPY_INDICATOR 7 /* RFC6790 */
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#define LABEL_GAL 13 /* RFC5586 */
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#define LABEL_OAM_ALERT 14 /* RFC3429 */
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#define LABEL_EXTENSION 15 /* RFC7274 */
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struct mpls_shim_hdr {
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__be32 label_stack_entry;
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};
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struct mpls_entry_decoded {
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u32 label;
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u8 ttl;
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u8 tc;
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u8 bos;
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};
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struct mpls_dev {
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int input_enabled;
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struct ctl_table_header *sysctl;
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};
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struct sk_buff;
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static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
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{
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return (struct mpls_shim_hdr *)skb_network_header(skb);
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}
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static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos)
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{
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struct mpls_shim_hdr result;
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result.label_stack_entry =
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cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
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(tc << MPLS_LS_TC_SHIFT) |
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(bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
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(ttl << MPLS_LS_TTL_SHIFT));
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return result;
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}
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static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr)
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{
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struct mpls_entry_decoded result;
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unsigned entry = be32_to_cpu(hdr->label_stack_entry);
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result.label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
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result.ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
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result.tc = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
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result.bos = (entry & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT;
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return result;
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}
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int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, const u32 label[]);
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int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels, u32 label[]);
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#endif /* MPLS_INTERNAL_H */
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