/*
 *      Types and definitions for AF_INET6 
 *      Linux INET6 implementation 
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>     
 *
 *      Sources:
 *      IPv6 Program Interfaces for BSD Systems
 *      <draft-ietf-ipngwg-bsd-api-05.txt>
 *
 *      Advanced Sockets API for IPv6
 *      <draft-stevens-advanced-api-00.txt>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#ifndef _LINUX_IN6_H
#define _LINUX_IN6_H

#include <linux/types.h>

/*
 *      IPv6 address structure
 */

struct in6_addr
{
        union 
        {
                __u8            u6_addr8[16];
                __u16           u6_addr16[8];
                __u32           u6_addr32[4];
        } in6_u;
#define s6_addr                 in6_u.u6_addr8
#define s6_addr16               in6_u.u6_addr16
#define s6_addr32               in6_u.u6_addr32
};

/* IPv6 Wildcard Address (::) and Loopback Address (::1) defined in RFC2553
 * NOTE: Be aware the IN6ADDR_* constants and in6addr_* externals are defined
 * in network byte order, not in host byte order as are the IPv4 equivalents
 */
extern const struct in6_addr in6addr_any;
#define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
extern const struct in6_addr in6addr_loopback;
#define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }

struct sockaddr_in6 {
        unsigned short int      sin6_family;    /* AF_INET6 */
        __u16                   sin6_port;      /* Transport layer port # */
        __u32                   sin6_flowinfo;  /* IPv6 flow information */
        struct in6_addr         sin6_addr;      /* IPv6 address */
        __u32                   sin6_scope_id;  /* scope id (new in RFC2553) */
};

struct ipv6_mreq {
        /* IPv6 multicast address of group */
        struct in6_addr ipv6mr_multiaddr;

        /* local IPv6 address of interface */
        int             ipv6mr_ifindex;
};

#define ipv6mr_acaddr   ipv6mr_multiaddr

struct in6_flowlabel_req
{
        struct in6_addr flr_dst;
        __u32   flr_label;
        __u8    flr_action;
        __u8    flr_share;
        __u16   flr_flags;
        __u16   flr_expires;
        __u16   flr_linger;
        __u32   __flr_pad;
        /* Options in format of IPV6_PKTOPTIONS */
};

#define IPV6_FL_A_GET   0
#define IPV6_FL_A_PUT   1
#define IPV6_FL_A_RENEW 2

#define IPV6_FL_F_CREATE        1
#define IPV6_FL_F_EXCL          2

#define IPV6_FL_S_NONE          0
#define IPV6_FL_S_EXCL          1
#define IPV6_FL_S_PROCESS       2
#define IPV6_FL_S_USER          3
#define IPV6_FL_S_ANY           255


/*
 *      Bitmask constant declarations to help applications select out the 
 *      flow label and priority fields.
 *
 *      Note that this are in host byte order while the flowinfo field of
 *      sockaddr_in6 is in network byte order.
 */

#define IPV6_FLOWINFO_FLOWLABEL         0x000fffff
#define IPV6_FLOWINFO_PRIORITY          0x0ff00000

/* These defintions are obsolete */
#define IPV6_PRIORITY_UNCHARACTERIZED   0x0000
#define IPV6_PRIORITY_FILLER            0x0100
#define IPV6_PRIORITY_UNATTENDED        0x0200
#define IPV6_PRIORITY_RESERVED1         0x0300
#define IPV6_PRIORITY_BULK              0x0400
#define IPV6_PRIORITY_RESERVED2         0x0500
#define IPV6_PRIORITY_INTERACTIVE       0x0600
#define IPV6_PRIORITY_CONTROL           0x0700
#define IPV6_PRIORITY_8                 0x0800
#define IPV6_PRIORITY_9                 0x0900
#define IPV6_PRIORITY_10                0x0a00
#define IPV6_PRIORITY_11                0x0b00
#define IPV6_PRIORITY_12                0x0c00
#define IPV6_PRIORITY_13                0x0d00
#define IPV6_PRIORITY_14                0x0e00
#define IPV6_PRIORITY_15                0x0f00

/*
 *      IPV6 extension headers
 */
#define IPPROTO_HOPOPTS         0       /* IPv6 hop-by-hop options      */
#define IPPROTO_ROUTING         43      /* IPv6 routing header          */
#define IPPROTO_FRAGMENT        44      /* IPv6 fragmentation header    */
#define IPPROTO_ICMPV6          58      /* ICMPv6                       */
#define IPPROTO_NONE            59      /* IPv6 no next header          */
#define IPPROTO_DSTOPTS         60      /* IPv6 destination options     */

/*
 *      IPv6 TLV options.
 */
#define IPV6_TLV_PAD0           0
#define IPV6_TLV_PADN           1
#define IPV6_TLV_ROUTERALERT    5
#define IPV6_TLV_JUMBO          194

/*
 *      IPV6 socket options
 */

#define IPV6_ADDRFORM           1
#define IPV6_PKTINFO            2
#define IPV6_HOPOPTS            3
#define IPV6_DSTOPTS            4
#define IPV6_RTHDR              5
#define IPV6_PKTOPTIONS         6
#define IPV6_CHECKSUM           7
#define IPV6_HOPLIMIT           8
#define IPV6_NEXTHOP            9
#define IPV6_AUTHHDR            10
#define IPV6_FLOWINFO           11

#define IPV6_UNICAST_HOPS       16
#define IPV6_MULTICAST_IF       17
#define IPV6_MULTICAST_HOPS     18
#define IPV6_MULTICAST_LOOP     19
#define IPV6_ADD_MEMBERSHIP     20
#define IPV6_DROP_MEMBERSHIP    21
#define IPV6_ROUTER_ALERT       22
#define IPV6_MTU_DISCOVER       23
#define IPV6_MTU                24
#define IPV6_RECVERR            25
#define IPV6_V6ONLY             26
#define IPV6_JOIN_ANYCAST       27
#define IPV6_LEAVE_ANYCAST      28

/* IPV6_MTU_DISCOVER values */
#define IPV6_PMTUDISC_DONT              0
#define IPV6_PMTUDISC_WANT              1
#define IPV6_PMTUDISC_DO                2

/* Flowlabel */
#define IPV6_FLOWLABEL_MGR      32
#define IPV6_FLOWINFO_SEND      33

#define IPV6_IPSEC_POLICY       34
#define IPV6_XFRM_POLICY        35


#endif