ipip.h

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#ifndef __NET_IPIP_H
#define __NET_IPIP_H 1

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

/* Keep error state on tunnel for 30 sec */
#define IPTUNNEL_ERR_TIMEO  (30*HZ)

/* 6rd prefix/relay information */
struct ip_tunnel_6rd_parm {
    struct in6_addr     prefix;
    __be32          relay_prefix;
    u16         prefixlen;
    u16         relay_prefixlen;
};

struct ip_tunnel {
    struct ip_tunnel __rcu  *next;
    struct net_device   *dev;

    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;

    /* for SIT */
#ifdef CONFIG_IPV6_SIT_6RD
    struct ip_tunnel_6rd_parm   ip6rd;
#endif
    struct ip_tunnel_prl_entry __rcu *prl;      /* potential router list */
    unsigned int            prl_count;  /* # of entries in PRL */

    struct gro_cells        gro_cells;
};

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

#define __IPTUNNEL_XMIT(stats1, stats2) do {                \
    int err;                            \
    int pkt_len = skb->len - skb_transport_offset(skb);     \
                                    \
    skb->ip_summed = CHECKSUM_NONE;                 \
    ip_select_ident(iph, &rt->dst, NULL);               \
                                    \
    err = ip_local_out(skb);                    \
    if (likely(net_xmit_eval(err) == 0)) {              \
        u64_stats_update_begin(&(stats1)->syncp);       \
        (stats1)->tx_bytes += pkt_len;              \
        (stats1)->tx_packets++;                 \
        u64_stats_update_end(&(stats1)->syncp);         \
    } else {                            \
        (stats2)->tx_errors++;                  \
        (stats2)->tx_aborted_errors++;              \
    }                               \
} while (0)

#define IPTUNNEL_XMIT() __IPTUNNEL_XMIT(txq, stats)

#endif