1 files changed, 51 insertions, 0 deletions

diff --git a/include/net/ipip.h b/include/net/ipip.h
new file mode 100644
index 000000000000..f490c3cbe377
--- /dev/null
+++ b/include/net/ipip.h
@@ -0,0 +1,51 @@
+#ifndef __NET_IPIP_H
+#define __NET_IPIP_H 1
+
+#include <linux/if_tunnel.h>
+
+/* Keep error state on tunnel for 30 sec */
+#define IPTUNNEL_ERR_TIMEO      (30*HZ)
+
+struct ip_tunnel
+{
+        struct ip_tunnel        *next;
+        struct net_device       *dev;
+        struct net_device_stats stat;
+
+        int                     recursion;      /* Depth of hard_start_xmit recursion */
+        int                     err_count;      /* Number of arrived ICMP errors */
+        unsigned long           err_time;       /* Time when the last ICMP error arrived */
+
+        /* These four fields used only by GRE */
+        __u32                   i_seqno;        /* The last seen seqno  */
+        __u32                   o_seqno;        /* The last output seqno */
+        int                     hlen;           /* Precalculated GRE header length */
+        int                     mlink;
+
+        struct ip_tunnel_parm   parms;
+};
+
+#define IPTUNNEL_XMIT() do {                                            \
+        int err;                                                        \
+        int pkt_len = skb->len;                                         \
+                                                                        \
+        skb->ip_summed = CHECKSUM_NONE;                                 \
+        iph->tot_len = htons(skb->len);                                 \
+        ip_select_ident(iph, &rt->u.dst, NULL);                         \
+        ip_send_check(iph);                                             \
+                                                                        \
+        err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, dst_output);\
+        if (err == NET_XMIT_SUCCESS || err == NET_XMIT_CN) {            \
+                stats->tx_bytes += pkt_len;                             \
+                stats->tx_packets++;                                    \
+        } else {                                                        \
+                stats->tx_errors++;                                     \
+                stats->tx_aborted_errors++;                             \
+        }                                                               \
+} while (0)
+
+
+extern int      sit_init(void);
+extern void     sit_cleanup(void);
+
+#endif