src/xt_skb.h

   1 /*
   2  * Lightweight Autonomic Network Architecture
   3  *
   4  * Copyright 2011 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
   5  * Swiss federal institute of technology (ETH Zurich)
   6  * Subject to the GPL.
   7  */
   8
   9 #ifndef XT_SKB_H
  10 #define XT_SKB_H
  11
  12 #include <linux/skbuff.h>
  13 #include "xt_idp.h"
  14
  15 struct sock_lana_inf {
  16         idp_t   idp_dst;
  17         idp_t   idp_src;
  18         __u32   flags;
  19         __u32   errno;
  20 };
  21
  22 #define SKB_LANA_INF(skb) ((struct sock_lana_inf *) ((skb)->cb))
  23
  24 static inline void write_next_idp_to_skb(struct sk_buff *skb, idp_t from,
  25                                          idp_t to)
  26 {
  27         struct sock_lana_inf *sli = SKB_LANA_INF(skb);
  28         sli->idp_dst = to;
  29         sli->idp_src = from;
  30 }
  31
  32 static inline idp_t read_next_idp_from_skb(struct sk_buff *skb)
  33 {
  34         return SKB_LANA_INF(skb)->idp_dst;
  35 }
  36
  37 #endif /* XT_SKB_H */
  38