#ifndef _IPV6_H
#define _IPV6_H

#include <linux/types.h>
#include <linux/in6.h>
#include <asm/byteorder.h>

/* The latest drafts declared increase in minimal mtu up to 1280. */

#define IPV6_MIN_MTU        1280

/*
 *        Advanced API
 *        source interface/address selection, source routing, etc...
 *        *under construction*
 */


struct in6_pktinfo {
        struct in6_addr        ipi6_addr;
        int                ipi6_ifindex;
};


struct in6_ifreq {
        struct in6_addr        ifr6_addr;
        __u32                ifr6_prefixlen;
        int                ifr6_ifindex; 
};

#define IPV6_SRCRT_STRICT        0x01        /* Deprecated; will be removed */
#define IPV6_SRCRT_TYPE_0        0        /* Deprecated; will be removed */
#define IPV6_SRCRT_TYPE_2        2        /* IPv6 type 2 Routing Header        */

/*
 *        routing header
 */
struct ipv6_rt_hdr {
        __u8                nexthdr;
        __u8                hdrlen;
        __u8                type;
        __u8                segments_left;

        /*
         *        type specific data
         *        variable length field
         */
};


struct ipv6_opt_hdr {
        __u8                 nexthdr;
        __u8                 hdrlen;
        /* 
         * TLV encoded option data follows.
         */
} __attribute__ ((packed));        /* required for some archs */

#define ipv6_destopt_hdr ipv6_opt_hdr
#define ipv6_hopopt_hdr  ipv6_opt_hdr


/*
 *        routing header type 0 (used in cmsghdr struct)
 */

struct rt0_hdr {
        struct ipv6_rt_hdr        rt_hdr;
        __u32                        reserved;
        struct in6_addr                addr[0];

#define rt0_type                rt_hdr.type
};

/*
 *        routing header type 2
 */

struct rt2_hdr {
        struct ipv6_rt_hdr        rt_hdr;
        __u32                        reserved;
        struct in6_addr                addr;

#define rt2_type                rt_hdr.type
};

/*
 *        home address option in destination options header
 */

struct ipv6_destopt_hao {
        __u8                        type;
        __u8                        length;
        struct in6_addr                addr;
} __attribute__ ((__packed__));

/*
 *        IPv6 fixed header
 *
 *        BEWARE, it is incorrect. The first 4 bits of flow_lbl
 *        are glued to priority now, forming "class".
 */

struct ipv6hdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        __u8                        priority:4,
                                version:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
        __u8                        version:4,
                                priority:4;
#else
#error        "Please fix <asm/byteorder.h>"
#endif
        __u8                        flow_lbl[3];

        __be16                        payload_len;
        __u8                        nexthdr;
        __u8                        hop_limit;

        struct        in6_addr        saddr;
        struct        in6_addr        daddr;
};


/* index values for the variables in ipv6_devconf */
enum {
        DEVCONF_FORWARDING = 0,
        DEVCONF_HOPLIMIT,
        DEVCONF_MTU6,
        DEVCONF_ACCEPT_RA,
        DEVCONF_ACCEPT_REDIRECTS,
        DEVCONF_AUTOCONF,
        DEVCONF_DAD_TRANSMITS,
        DEVCONF_RTR_SOLICITS,
        DEVCONF_RTR_SOLICIT_INTERVAL,
        DEVCONF_RTR_SOLICIT_DELAY,
        DEVCONF_USE_TEMPADDR,
        DEVCONF_TEMP_VALID_LFT,
        DEVCONF_TEMP_PREFERED_LFT,
        DEVCONF_REGEN_MAX_RETRY,
        DEVCONF_MAX_DESYNC_FACTOR,
        DEVCONF_MAX_ADDRESSES,
        DEVCONF_FORCE_MLD_VERSION,
        DEVCONF_ACCEPT_RA_DEFRTR,
        DEVCONF_ACCEPT_RA_PINFO,
        DEVCONF_ACCEPT_RA_RTR_PREF,
        DEVCONF_RTR_PROBE_INTERVAL,
        DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
        DEVCONF_PROXY_NDP,
        DEVCONF_OPTIMISTIC_DAD,
        DEVCONF_ACCEPT_SOURCE_ROUTE,
        DEVCONF_MC_FORWARDING,
        DEVCONF_DISABLE_IPV6,
        DEVCONF_ACCEPT_DAD,
        DEVCONF_MAX
};


#endif /* _IPV6_H */