ip6.h

Host Identity Protocol on Linux is an implemetation of the Host Identity Protocol (HIP) and the rela

/* $USAGI: ip6.h,v 1.1 2001/02/11 08:04:19 yoshfuji Exp $ */

/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifndef _NETINET_IP6_H
#define _NETINET_IP6_H 1

#include <inttypes.h>
#include <netinet/in.h>

struct ip6_hdr 
  {
    union 
      {
	struct ip6_hdrctl 
	  {
	    uint32_t ip6_un1_flow;   /* 24 bits of flow-ID */
	    uint16_t ip6_un1_plen;   /* payload length */
	    uint8_t  ip6_un1_nxt;    /* next header */
	    uint8_t  ip6_un1_hlim;   /* hop limit */
	  } ip6_un1;
	uint8_t ip6_un2_vfc;       /* 4 bits version, 4 bits priority */
      } ip6_ctlun;
    struct in6_addr ip6_src;      /* source address */
    struct in6_addr ip6_dst;      /* destination address */
  };

#define ip6_vfc   ip6_ctlun.ip6_un2_vfc
#define ip6_flow  ip6_ctlun.ip6_un1.ip6_un1_flow
#define ip6_plen  ip6_ctlun.ip6_un1.ip6_un1_plen
#define ip6_nxt   ip6_ctlun.ip6_un1.ip6_un1_nxt
#define ip6_hlim  ip6_ctlun.ip6_un1.ip6_un1_hlim
#define ip6_hops  ip6_ctlun.ip6_un1.ip6_un1_hlim

#ifdef __USE_GNU
/* IPv6 extension header */
struct ip6_ext
  {
    uint8_t  ip6e_nxt;
    uint8_t  ip6e_len;
  };
#endif

/* Hop-by-Hop options header.  */
struct ip6_hbh 
  {
    uint8_t  ip6h_nxt;        /* next hesder.  */
    uint8_t  ip6h_len;        /* length in units of 8 octets.  */
    /* followed by options */
  };

/* Destination options header */
struct ip6_dest 
  {
    uint8_t  ip6d_nxt;        /* next header */
    uint8_t  ip6d_len;        /* length in units of 8 octets */
    /* followed by options */
  };

/* Routing header */
struct ip6_rthdr 
  {
    uint8_t  ip6r_nxt;        /* next header */
    uint8_t  ip6r_len;        /* length in units of 8 octets */
    uint8_t  ip6r_type;       /* routing type */
    uint8_t  ip6r_segleft;    /* segments left */
    /* followed by routing type specific data */
  };

/* Type 0 Routing header */
struct ip6_rthdr0 
  {
    uint8_t  ip6r0_nxt;       /* next header */
    uint8_t  ip6r0_len;       /* length in units of 8 octets */
    uint8_t  ip6r0_type;      /* always zero */
    uint8_t  ip6r0_segleft;   /* segments left */
    uint8_t  ip6r0_reserved;  /* reserved field */
    uint8_t  ip6r0_slmap[3];  /* strict/loose bit map */
    struct in6_addr  ip6r0_addr[1];  /* XXX: removed in RFC2292bis */
  };

/* Fragment header */
struct ip6_frag 
  {
    uint8_t   ip6f_nxt;       /* next header */
    uint8_t   ip6f_reserved;  /* reserved field */
    uint16_t  ip6f_offlg;     /* offset, reserved, and flag */
    uint32_t  ip6f_ident;     /* identification */
  };

#if     BYTE_ORDER == BIG_ENDIAN
#define IP6F_OFF_MASK       0xfff8  /* mask out offset from _offlg */
#define IP6F_RESERVED_MASK  0x0006  /* reserved bits in ip6f_offlg */
#define IP6F_MORE_FRAG      0x0001  /* more-fragments flag */
#else   /* BYTE_ORDER == LITTLE_ENDIAN */
#define IP6F_OFF_MASK       0xf8ff  /* mask out offset from _offlg */
#define IP6F_RESERVED_MASK  0x0600  /* reserved bits in ip6f_offlg */
#define IP6F_MORE_FRAG      0x0100  /* more-fragments flag */
#endif

/* IPv6 Options */
struct ip6_opt {
  uint8_t ip6o_type;
  uint8_t ip6o_len;
};

/*
 * The high-order 3 bits of the option type define the behavior
 * when processing an unknown option and whether or not the option
 * content changes in flight.
 */
#define IP6OPT_TYPE(o)		((o) & 0xc0)
#define IP6OPT_TYPE_SKIP	0x00
#define IP6OPT_TYPE_DISCARD	0x40
#define IP6OPT_TYPE_FORCEICMP	0x80
#define IP6OPT_TYPE_ICMP	0xc0
#define IP6OPT_MUTABLE		0x20

#define IP6OPT_PAD1		0x00	/* 00 0 00000 */
#define IP6OPT_PADN		0x01	/* 00 0 00001 */
#define IP6OPT_JUMBO		0xc2	/* 11 0 00010 = 194 */
#define IP6OPT_NSAP_ADDR	0xc3	/* 11 0 00011 */
#define IP6OPT_TUNNEL_LIMIT	0x04	/* 00 0 00100 */
#define IP6OPT_ROUTER_ALERT	0x05	/* 00 0 00101 */
#define IP6OPT_BINDING_UPDATE	0xc6	/* 11 0 00110 */
#define IP6OPT_BINDING_ACK	0x07	/* 00 0 00111 */
#define IP6OPT_BINDING_REQ	0x08	/* 00 0 01000 */
#define IP6OPT_HOME_ADDRESS	0xc9	/* 11 0 01001 */
#define IP6OPT_EID		0x8a	/* 10 0 01010 */

/* Jumbo Payload Option */
struct ip6_opt_jumbo {
    uint8_t ip6oj_type;
    uint8_t ip6oj_len;
    uint8_t ip6oj_jumbo_len[4];
};
#define	IP6OPT_JUMBO_LEN	6

/* NSAP Address Option */
struct ip6_opt_nsap {
    uint8_t ip6on_type;
    uint8_t ip6on_len;
    uint8_t ip6on_src_nsap_len;
    uint8_t ip6on_dst_nsap_len;
      /* followed by source NSAP */
      /* followed by destination NSAP */
};

/* Tunnel Limit Option */
struct ip6_opt_tunnel {
    uint8_t ip6ot_type;
    uint8_t ip6ot_len;
    uint8_t ip6ot_encap_limit;
};

/* Router Alert Option */
struct ip6_opt_router {
    uint8_t ip6or_type;
    uint8_t ip6or_len;
    uint8_t ip6or_value[2];
};

/* Router alert values (in network byte order) */
#ifdef _BIG_ENDIAN
# define IP6_ALERT_MLD		0x0000
# define IP6_ALERT_RSVP		0x0001
# define IP6_ALERT_AN		0x0002
#else
# define IP6_ALERT_MLD		0x0000
# define IP6_ALERT_RSVP		0x0100
# define IP6_ALERT_AN		0x0200
#endif

/* Binding Update Option */
struct ip6_opt_binding_update {
    uint8_t ip6ou_type;
    uint8_t ip6ou_len;
    uint8_t ip6ou_flags;
    uint8_t ip6ou_prefixlen;
    uint8_t ip6ou_seqno[2];
    uint8_t ip6ou_lifetime[4];
    uint8_t ip6ou_coa[16];		/* Optional based on flags */
      /* followed by sub-options */
};

/* Binding Update Flags */
#define IP6_BUF_ACK		0x80	/* Request a binding ack */
#define IP6_BUF_HOME		0x40	/* Home Registration */
#define IP6_BUF_COA		0x20	/* Care-of-address present in option */
#define IP6_BUF_ROUTER		0x10	/* Sending mobile node is a router */

/* Binding Ack Option */
struct ip6_opt_binding_ack {
    uint8_t ip6oa_type;
    uint8_t ip6oa_len;
    uint8_t ip6oa_status;
    uint8_t ip6oa_seqno[2];
    uint8_t ip6oa_lifetime[4];
    uint8_t ip6oa_refresh[4];
      /* followed by sub-options */
};

/* Binding Request Option */
struct ip6_opt_binding_request {
    uint8_t ip6or_type;
    uint8_t ip6or_len;
      /* followed by sub-options */
};

/* Home Address Option */
struct ip6_opt_home_address {
    uint8_t ip6oh_type;
    uint8_t ip6oh_len;
    uint8_t ip6oh_addr[16];	/* Home Address */
      /* followed by sub-options */
};

#endif /* netinet/ip6.h */