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/*!\file netinet/ipv6.h
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 * Linux IPv6 definitions.
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 */
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/*
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 *      Linux INET6 implementation
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 *
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 *      Authors:
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 *      Pedro Roque             <roque@di.fc.ul.pt>
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 *
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 *      $Id: ipv6.h,v 1.6 1997/04/01 02:22:58 davem Exp $
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 *
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 *      This program is free software; you can redistribute it and/or
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 *      modify it under the terms of the GNU General Public License
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 *      as published by the Free Software Foundation; either version
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 *      2 of the License, or (at your option) any later version.
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 *
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 *  NB! Don't ue this file. Use <netinet/in.h> instread.
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 */
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#ifndef _NET_IPV6_H
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#define _NET_IPV6_H
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#ifndef __NETINET_IN_H
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#include <netinet/in.h>  /* in6_addr */
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#endif
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/*
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 *  Advanced API
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 *  source interface/address selection, source routing, etc...
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 *  *under construction*
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 */
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#include <sys/packon.h>
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/*
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 *  IPv6 fixed header
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 */
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struct ipv6hdr {
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       unsigned char   ipv6_priority:4;
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       unsigned char   ipv6_version:4;
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       unsigned char   ipv6_flow_lbl[3];
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       unsigned short  ipv6_len;
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       unsigned char   ipv6_nextheader;
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       unsigned char   ipv6_hoplimit;
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       struct in6_addr ipv6_src;
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       struct in6_addr ipv6_dst;
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     };
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/*
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 *  The length of this struct cannot be greater than the length of
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 *  the proto_priv field in a sk_buff which is currently
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 *  defined to be 16 bytes.
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 *  Pointers take upto 8 bytes (sizeof(void *) is 8 on the alpha).
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 */
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struct ipv6_options  {
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       /* length of extension headers */
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       unsigned short opt_flen;       /* after fragment hdr */
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       unsigned short opt_nflen;      /* before fragment hdr */
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      /*
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       * protocol options
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       * usualy carried in IPv6 extension headers
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       */
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       struct ipv6_rt_hdr *srcrt; /* Routing Header */
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      };
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struct in6_pktinfo {
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       struct in6_addr ipi6_addr;
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       int             ipi6_ifindex;
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     };
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struct in6_ifreq {
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       struct in6_addr ifr6_addr;
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       unsigned long   ifr6_prefixlen;
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       unsigned long   ifr6_ifindex;
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     };
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#define IPV6_SRCRT_STRICT       0x01    /* this hop must be a neighbor  */
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#define IPV6_SRCRT_TYPE_0       0       /* IPv6 type 0 Routing Header   */
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/*
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 *      routing header
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 */
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struct ipv6_rt_hdr {
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       unsigned char  nexthdr;
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       unsigned char  hdrlen;
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       unsigned char  type;
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       unsigned char  segments_left;
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       /*
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        * type specific data
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        * variable length field
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        */
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     };
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/*
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 * routing header type 0 (used in cmsghdr struct)
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 */
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struct ipv6_rt0_hdr {
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       struct ipv6_rt_hdr rt_hdr;
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       unsigned long      bitmap;         /* strict/loose bit map */
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#ifndef __WATCOMC__
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       struct in6_addr    addr[0];
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#endif
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#define rt0_type rt_hdr.type;
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     };
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/*
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 *  NextHeader field of IPv6 header
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 */
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#define NEXTHDR_HOP             0       /* Hop-by-hop option header. */
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#define NEXTHDR_TCP             6       /* TCP segment. */
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#define NEXTHDR_UDP             17      /* UDP message. */
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#define NEXTHDR_IPV6            41      /* IPv6 in IPv6 */
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#define NEXTHDR_ROUTING         43      /* Routing header. */
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#define NEXTHDR_FRAGMENT        44      /* Fragmentation/reassembly header. */
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#define NEXTHDR_ESP             50      /* Encapsulating security payload. */
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#define NEXTHDR_AUTH            51      /* Authentication header. */
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#define NEXTHDR_ICMP            58      /* ICMP for IPv6. */
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#define NEXTHDR_NONE            59      /* No next header */
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#define NEXTHDR_DEST            60      /* Destination options header. */
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#define NEXTHDR_MAX             255
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#define IPV6_DEFAULT_HOPLIMIT   64
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#define IPV6_DEFAULT_MCASTHOPS  1
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/*
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 *      Addr type
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 *
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 *      type    -       unicast | multicast | anycast
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 *      scope   -       local   | site      | global
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 *      v4      -       compat
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 *      v4mapped
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 *      any
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 *      loopback
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 */
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#define IPV6_ADDR_ANY           0x0000U
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#define IPV6_ADDR_UNICAST       0x0001U
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#define IPV6_ADDR_MULTICAST     0x0002U
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#define IPV6_ADDR_ANYCAST       0x0004U
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#define IPV6_ADDR_LOOPBACK      0x0010U
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#define IPV6_ADDR_LINKLOCAL     0x0020U
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#define IPV6_ADDR_SITELOCAL     0x0040U
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#define IPV6_ADDR_COMPATv4      0x0080U
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#define IPV6_ADDR_SCOPE_MASK    0x00f0U
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#define IPV6_ADDR_MAPPED        0x1000U
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#define IPV6_ADDR_RESERVED      0x2000U /* reserved address space */
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/*
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 *      fragmentation header
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 */
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struct ipv6_fraghdr {
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       unsigned char   nexthdr;
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       unsigned char   reserved;
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       unsigned short  frag_off;
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       unsigned long   identification;
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     };
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#define fraghdr ipv6_fraghdr
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#include <sys/packoff.h>
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#endif
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