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