ip6_tunnel.h

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#ifndef _NET_IP6_TUNNEL_H
#define _NET_IP6_TUNNEL_H

#include <linux/ipv6.h>
#include <linux/netdevice.h>
#include <linux/ip6_tunnel.h>

#define IP6TUNNEL_ERR_TIMEO (30*HZ)

/* capable of sending packets */
#define IP6_TNL_F_CAP_XMIT 0x10000
/* capable of receiving packets */
#define IP6_TNL_F_CAP_RCV 0x20000
/* determine capability on a per-packet basis */
#define IP6_TNL_F_CAP_PER_PACKET 0x40000

struct __ip6_tnl_parm {
    char name[IFNAMSIZ];    /* name of tunnel device */
    int link;       /* ifindex of underlying L2 interface */
    __u8 proto;     /* tunnel protocol */
    __u8 encap_limit;   /* encapsulation limit for tunnel */
    __u8 hop_limit;     /* hop limit for tunnel */
    __be32 flowinfo;    /* traffic class and flowlabel for tunnel */
    __u32 flags;        /* tunnel flags */
    struct in6_addr laddr;  /* local tunnel end-point address */
    struct in6_addr raddr;  /* remote tunnel end-point address */

    __be16          i_flags;
    __be16          o_flags;
    __be32          i_key;
    __be32          o_key;
};

/* IPv6 tunnel */
struct ip6_tnl {
    struct ip6_tnl __rcu *next; /* next tunnel in list */
    struct net_device *dev; /* virtual device associated with tunnel */
    struct __ip6_tnl_parm parms;    /* tunnel configuration parameters */
    struct flowi fl;    /* flowi template for xmit */
    struct dst_entry *dst_cache;    /* cached dst */
    u32 dst_cookie;

    int err_count;
    unsigned long err_time;

    /* These 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;
};

/* Tunnel encapsulation limit destination sub-option */

struct ipv6_tlv_tnl_enc_lim {
    __u8 type;      /* type-code for option         */
    __u8 length;        /* option length                */
    __u8 encap_limit;   /* tunnel encapsulation limit   */
} __packed;

struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t);
void ip6_tnl_dst_reset(struct ip6_tnl *t);
void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst);
int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
        const struct in6_addr *raddr);
int ip6_tnl_xmit_ctl(struct ip6_tnl *t);
__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
                 const struct in6_addr *raddr);

#endif