ip6_tunnel.h

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#ifndef _IP6_TUNNEL_H
#define _IP6_TUNNEL_H

#include <linux/types.h>

#define IPV6_TLV_TNL_ENCAP_LIMIT 4
#define IPV6_DEFAULT_TNL_ENCAP_LIMIT 4

/* don't add encapsulation limit if one isn't present in inner packet */
#define IP6_TNL_F_IGN_ENCAP_LIMIT 0x1
/* copy the traffic class field from the inner packet */
#define IP6_TNL_F_USE_ORIG_TCLASS 0x2
/* copy the flowlabel from the inner packet */
#define IP6_TNL_F_USE_ORIG_FLOWLABEL 0x4
/* being used for Mobile IPv6 */
#define IP6_TNL_F_MIP6_DEV 0x8
/* copy DSCP from the outer packet */
#define IP6_TNL_F_RCV_DSCP_COPY 0x10
/* copy fwmark from inner packet */
#define IP6_TNL_F_USE_ORIG_FWMARK 0x20

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 */
};

struct ip6_tnl_parm2 {
    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;
};

#endif