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/* Copyright (C) 1991-1997, 2001, 2003, 2006 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#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; /* 4 bits version, 8 bits TC,
20 bits 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, top 4 bits tclass */
} 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
/* Generic extension header. */
struct ip6_ext
{
uint8_t ip6e_nxt; /* next header. */
uint8_t ip6e_len; /* length in units of 8 octets. */
};
/* Hop-by-Hop options header. */
struct ip6_hbh
{
uint8_t ip6h_nxt; /* next header. */
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 */
/* followed by up to 127 struct in6_addr */
struct in6_addr ip6r0_addr[0];
};
/* 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_TYPE_MUTABLE 0x20
/* Special option types for padding. */
#define IP6OPT_PAD1 0
#define IP6OPT_PADN 1
#define IP6OPT_JUMBO 0xc2
#define IP6OPT_NSAP_ADDR 0xc3
#define IP6OPT_TUNNEL_LIMIT 0x04
#define IP6OPT_ROUTER_ALERT 0x05
/* 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) */
#if BYTE_ORDER == BIG_ENDIAN
# define IP6_ALERT_MLD 0x0000
# define IP6_ALERT_RSVP 0x0001
# define IP6_ALERT_AN 0x0002
#else /* BYTE_ORDER == LITTLE_ENDING */
# define IP6_ALERT_MLD 0x0000
# define IP6_ALERT_RSVP 0x0100
# define IP6_ALERT_AN 0x0200
#endif
#endif /* netinet/ip6.h */