root/include/net/ipip.h

INCLUDED FROM

#ifndef __NET_IPIP_H
#define __NET_IPIP_H 1

#include <linux/if_tunnel.h>
#include <net/ip.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;

        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;

        struct ip_tunnel_prl_entry      *prl;           /* potential router list */
        unsigned int                    prl_count;      /* # of entries in PRL */
};

struct ip_tunnel_prl_entry
{
        struct ip_tunnel_prl_entry      *next;
        __be32                          addr;
        u16                             flags;
};

#define IPTUNNEL_XMIT() do {                                            \
        int err;                                                        \
        int pkt_len = skb->len - skb_transport_offset(skb);             \
                                                                        \
        skb->ip_summed = CHECKSUM_NONE;                                 \
        ip_select_ident(iph, &rt->u.dst, NULL);                         \
                                                                        \
        err = ip_local_out(skb);                                        \
        if (net_xmit_eval(err) == 0) {                                  \
                stats->tx_bytes += pkt_len;                             \
                stats->tx_packets++;                                    \
        } else {                                                        \
                stats->tx_errors++;                                     \
                stats->tx_aborted_errors++;                             \
        }                                                               \
} while (0)

#endif