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   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 (net_xmit_eval(err) == 0) {                                  \
  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 #endif