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 #define MARKER_TIME_MARKED_FIRST        (1 << 0)
  16 #define MARKER_TIME_MARKED_LAST         (1 << 1)
  17
  18 struct sock_lana_inf {
  19         idp_t   idp_dst;
  20         idp_t   idp_src;
  21         __u32   flags;
  22         __u32   errno;
  23         __u32   marker;
  24 };
  25
  26 #define SKB_LANA_INF(skb) ((struct sock_lana_inf *) ((skb)->cb))
  27
  28 static inline void write_next_idp_to_skb(struct sk_buff *skb, idp_t from,
  29                                          idp_t to)
  30 {
  31         struct sock_lana_inf *sli;
  32         sli = SKB_LANA_INF(skb);
  33         sli->idp_dst = to;
  34         sli->idp_src = from;
  35 }
  36
  37 static inline idp_t read_next_idp_from_skb(struct sk_buff *skb)
  38 {
  39         return SKB_LANA_INF(skb)->idp_dst;
  40 }
  41
  42 static inline void time_mark_skb_last(struct sk_buff *skb)
  43 {
  44         struct sock_lana_inf *sli = SKB_LANA_INF(skb);
  45         sli->marker |= MARKER_TIME_MARKED_LAST;
  46 }
  47
  48 static inline int skb_is_time_marked_last(struct sk_buff *skb)
  49 {
  50         return (SKB_LANA_INF(skb)->marker &
  51                 MARKER_TIME_MARKED_LAST) == MARKER_TIME_MARKED_LAST;
  52 }
  53
  54 static inline void time_mark_skb_first(struct sk_buff *skb)
  55 {
  56         struct sock_lana_inf *sli = SKB_LANA_INF(skb);
  57         sli->marker |= MARKER_TIME_MARKED_FIRST;
  58 }
  59
  60 static inline int skb_is_time_marked_first(struct sk_buff *skb)
  61 {
  62         return (SKB_LANA_INF(skb)->marker &
  63                 MARKER_TIME_MARKED_FIRST) == MARKER_TIME_MARKED_FIRST;
  64 }
  65
  66 #endif /* XT_SKB_H */
  67