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 struct rcu_head rcu; 20 }; 21 22 struct sk_buff; 23 24 static 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 29 static 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 40 static 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 53 int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, 54 const u32 label[]); 55 int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels, 56 u32 label[]); 57 bool mpls_output_possible(const struct net_device *dev); 58 unsigned int mpls_dev_mtu(const struct net_device *dev); 59 bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu); 60 61 #endif /* MPLS_INTERNAL_H */ 62