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         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 */