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