1 #ifndef MPLS_INTERNAL_H 2 #define MPLS_INTERNAL_H 3 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 */ 12 13 14 struct mpls_shim_hdr { 15 __be32 label_stack_entry; 16 }; 17 18 struct mpls_entry_decoded { 19 u32 label; 20 u8 ttl; 21 u8 tc; 22 u8 bos; 23 }; 24 25 struct mpls_dev { 26 int input_enabled; 27 28 struct ctl_table_header *sysctl; 29 }; 30 31 struct sk_buff; 32 33 static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb) 34 { 35 return (struct mpls_shim_hdr *)skb_network_header(skb); 36 } 37 38 static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, unsigned ttl, unsigned tc, bool bos) 39 { 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)); 46 return result; 47 } 48 49 static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr *hdr) 50 { 51 struct mpls_entry_decoded result; 52 unsigned entry = be32_to_cpu(hdr->label_stack_entry); 53 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; 58 59 return result; 60 } 61 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[]); 64 65 #endif /* MPLS_INTERNAL_H */ 66