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189 lines
5.3 KiB
C
189 lines
5.3 KiB
C
/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _NETINET_IP6_H
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#define _NETINET_IP6_H 1
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#include <inttypes.h>
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#include <netinet/in.h>
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struct ip6_hdr
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{
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union
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{
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struct ip6_hdrctl
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{
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uint32_t ip6_un1_flow; /* 4 bits version, 8 bits TC,
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20 bits flow-ID */
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uint16_t ip6_un1_plen; /* payload length */
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uint8_t ip6_un1_nxt; /* next header */
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uint8_t ip6_un1_hlim; /* hop limit */
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} ip6_un1;
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uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits tclass */
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} ip6_ctlun;
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struct in6_addr ip6_src; /* source address */
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struct in6_addr ip6_dst; /* destination address */
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};
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#define ip6_vfc ip6_ctlun.ip6_un2_vfc
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#define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
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#define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
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#define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
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#define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
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#define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
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/* Generic extension header. */
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struct ip6_ext
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{
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uint8_t ip6e_nxt; /* next header. */
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uint8_t ip6e_len; /* length in units of 8 octets. */
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};
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/* Hop-by-Hop options header. */
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struct ip6_hbh
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{
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uint8_t ip6h_nxt; /* next header. */
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uint8_t ip6h_len; /* length in units of 8 octets. */
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/* followed by options */
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};
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/* Destination options header */
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struct ip6_dest
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{
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uint8_t ip6d_nxt; /* next header */
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uint8_t ip6d_len; /* length in units of 8 octets */
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/* followed by options */
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};
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/* Routing header */
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struct ip6_rthdr
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{
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uint8_t ip6r_nxt; /* next header */
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uint8_t ip6r_len; /* length in units of 8 octets */
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uint8_t ip6r_type; /* routing type */
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uint8_t ip6r_segleft; /* segments left */
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/* followed by routing type specific data */
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};
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/* Type 0 Routing header */
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struct ip6_rthdr0
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{
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uint8_t ip6r0_nxt; /* next header */
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uint8_t ip6r0_len; /* length in units of 8 octets */
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uint8_t ip6r0_type; /* always zero */
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uint8_t ip6r0_segleft; /* segments left */
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uint8_t ip6r0_reserved; /* reserved field */
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uint8_t ip6r0_slmap[3]; /* strict/loose bit map */
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/* followed by up to 127 struct in6_addr */
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struct in6_addr ip6r0_addr[0];
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};
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/* Fragment header */
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struct ip6_frag
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{
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uint8_t ip6f_nxt; /* next header */
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uint8_t ip6f_reserved; /* reserved field */
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uint16_t ip6f_offlg; /* offset, reserved, and flag */
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uint32_t ip6f_ident; /* identification */
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};
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#if BYTE_ORDER == BIG_ENDIAN
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# define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
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# define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
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# define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
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#else /* BYTE_ORDER == LITTLE_ENDIAN */
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# define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
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# define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
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# define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
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#endif
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/* IPv6 options */
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struct ip6_opt
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{
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uint8_t ip6o_type;
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uint8_t ip6o_len;
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};
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/* The high-order 3 bits of the option type define the behavior
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* when processing an unknown option and whether or not the option
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* content changes in flight.
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*/
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#define IP6OPT_TYPE(o) ((o) & 0xc0)
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#define IP6OPT_TYPE_SKIP 0x00
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#define IP6OPT_TYPE_DISCARD 0x40
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#define IP6OPT_TYPE_FORCEICMP 0x80
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#define IP6OPT_TYPE_ICMP 0xc0
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#define IP6OPT_TYPE_MUTABLE 0x20
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/* Special option types for padding. */
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#define IP6OPT_PAD1 0
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#define IP6OPT_PADN 1
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#define IP6OPT_JUMBO 0xc2
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#define IP6OPT_NSAP_ADDR 0xc3
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#define IP6OPT_TUNNEL_LIMIT 0x04
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#define IP6OPT_ROUTER_ALERT 0x05
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/* Jumbo Payload Option */
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struct ip6_opt_jumbo
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{
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uint8_t ip6oj_type;
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uint8_t ip6oj_len;
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uint8_t ip6oj_jumbo_len[4];
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};
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#define IP6OPT_JUMBO_LEN 6
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/* NSAP Address Option */
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struct ip6_opt_nsap
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{
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uint8_t ip6on_type;
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uint8_t ip6on_len;
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uint8_t ip6on_src_nsap_len;
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uint8_t ip6on_dst_nsap_len;
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/* followed by source NSAP */
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/* followed by destination NSAP */
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};
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/* Tunnel Limit Option */
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struct ip6_opt_tunnel
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{
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uint8_t ip6ot_type;
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uint8_t ip6ot_len;
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uint8_t ip6ot_encap_limit;
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};
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/* Router Alert Option */
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struct ip6_opt_router
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{
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uint8_t ip6or_type;
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uint8_t ip6or_len;
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uint8_t ip6or_value[2];
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};
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/* Router alert values (in network byte order) */
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#if BYTE_ORDER == BIG_ENDIAN
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# define IP6_ALERT_MLD 0x0000
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# define IP6_ALERT_RSVP 0x0001
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# define IP6_ALERT_AN 0x0002
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#else /* BYTE_ORDER == LITTLE_ENDING */
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# define IP6_ALERT_MLD 0x0000
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# define IP6_ALERT_RSVP 0x0100
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# define IP6_ALERT_AN 0x0200
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#endif
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#endif /* netinet/ip6.h */
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