net/mpls/internal.h

   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 */