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C/C++ Source or Header  |  2006-08-11  |  1.3 KB  |  52 lines
  1. #ifndef __NET_IPIP_H
  2. #define __NET_IPIP_H 1
  3.  
  4. #include <linux/if_tunnel.h>
  5.  
  6. /* Keep error state on tunnel for 30 sec */
  7. #define IPTUNNEL_ERR_TIMEO    (30*HZ)
  8.  
  9. struct ip_tunnel
  10. {
  11.     struct ip_tunnel    *next;
  12.     struct net_device    *dev;
  13.     struct net_device_stats    stat;
  14.  
  15.     int            recursion;    /* Depth of hard_start_xmit recursion */
  16.     int            err_count;    /* Number of arrived ICMP errors */
  17.     unsigned long        err_time;    /* Time when the last ICMP error arrived */
  18.  
  19.     /* These four fields used only by GRE */
  20.     __u32            i_seqno;    /* The last seen seqno    */
  21.     __u32            o_seqno;    /* The last output seqno */
  22.     int            hlen;        /* Precalculated GRE header length */
  23.     int            mlink;
  24.  
  25.     struct ip_tunnel_parm    parms;
  26. };
  27.  
  28. #define IPTUNNEL_XMIT() do {                        \
  29.     int err;                            \
  30.     int pkt_len = skb->len;                        \
  31.                                     \
  32.     skb->ip_summed = CHECKSUM_NONE;                    \
  33.     iph->tot_len = htons(skb->len);                    \
  34.     ip_select_ident(iph, &rt->u.dst, NULL);                \
  35.     ip_send_check(iph);                        \
  36.                                     \
  37.     err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, dst_output);\
  38.     if (err == NET_XMIT_SUCCESS || err == NET_XMIT_CN) {        \
  39.         stats->tx_bytes += pkt_len;                \
  40.         stats->tx_packets++;                    \
  41.     } else {                            \
  42.         stats->tx_errors++;                    \
  43.         stats->tx_aborted_errors++;                \
  44.     }                                \
  45. } while (0)
  46.  
  47.  
  48. extern int    sit_init(void);
  49. extern void    sit_cleanup(void);
  50.  
  51. #endif
  52.