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         enum path_type  dir;
  25 };
  26
  27 #define SKB_LANA_INF(skb) ((struct sock_lana_inf *) ((skb)->cb))
  28
  29 static inline void write_next_idp_to_skb(struct sk_buff *skb, idp_t from,
  30                                          idp_t to)
  31 {
  32         struct sock_lana_inf *sli;
  33         sli = SKB_LANA_INF(skb);
  34         sli->idp_dst = to;
  35         sli->idp_src = from;
  36 }
  37
  38 static inline idp_t read_next_idp_from_skb(struct sk_buff *skb)
  39 {
  40         return SKB_LANA_INF(skb)->idp_dst;
  41 }
  42
  43 static inline void write_path_to_skb(struct sk_buff *skb, enum path_type dir)
  44 {
  45         struct sock_lana_inf *sli;
  46         sli = SKB_LANA_INF(skb);
  47         sli->dir = dir;
  48 }
  49
  50 static inline enum path_type read_path_from_skb(struct sk_buff *skb)
  51 {
  52         return SKB_LANA_INF(skb)->dir;
  53 }
  54
  55 static inline void time_mark_skb_last(struct sk_buff *skb)
  56 {
  57         struct sock_lana_inf *sli = SKB_LANA_INF(skb);
  58         sli->marker |= MARKER_TIME_MARKED_LAST;
  59 }
  60
  61 static inline int skb_is_time_marked_last(struct sk_buff *skb)
  62 {
  63         return (SKB_LANA_INF(skb)->marker &
  64                 MARKER_TIME_MARKED_LAST) == MARKER_TIME_MARKED_LAST;
  65 }
  66
  67 static inline void time_mark_skb_first(struct sk_buff *skb)
  68 {
  69         struct sock_lana_inf *sli = SKB_LANA_INF(skb);
  70         sli->marker |= MARKER_TIME_MARKED_FIRST;
  71 }
  72
  73 static inline int skb_is_time_marked_first(struct sk_buff *skb)
  74 {
  75         return (SKB_LANA_INF(skb)->marker &
  76                 MARKER_TIME_MARKED_FIRST) == MARKER_TIME_MARKED_FIRST;
  77 }
  78
  79 #endif /* XT_SKB_H */
  80