include/net/dst_metadata.h

   1 #ifndef __NET_DST_METADATA_H
   2 #define __NET_DST_METADATA_H 1
   3
   4 #include <linux/skbuff.h>
   5 #include <net/ip_tunnels.h>
   6 #include <net/dst.h>
   7
   8 struct metadata_dst {
   9         struct dst_entry                dst;
  10         size_t                          opts_len;
  11         union {
  12                 struct ip_tunnel_info   tun_info;
  13         } u;
  14 };
  15
  16 static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb)
  17 {
  18         struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);
  19
  20         if (md_dst && md_dst->dst.flags & DST_METADATA)
  21                 return md_dst;
  22
  23         return NULL;
  24 }
  25
  26 static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb)
  27 {
  28         struct metadata_dst *md_dst = skb_metadata_dst(skb);
  29         struct dst_entry *dst;
  30
  31         if (md_dst)
  32                 return &md_dst->u.tun_info;
  33
  34         dst = skb_dst(skb);
  35         if (dst && dst->lwtstate)
  36                 return lwt_tun_info(dst->lwtstate);
  37
  38         return NULL;
  39 }
  40
  41 static inline bool skb_valid_dst(const struct sk_buff *skb)
  42 {
  43         struct dst_entry *dst = skb_dst(skb);
  44
  45         return dst && !(dst->flags & DST_METADATA);
  46 }
  47
  48 struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags);
  49 struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags);
  50
  51 #endif /* __NET_DST_METADATA_H */