ip6.h
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上传日期:2009-04-28
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- /* Copyright (C) 1991-1997, 2001, 2003 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, 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; /* 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 */
- struct in6_addr ip6r0_addr[1]; /* up to 23 addresses */
- };
- /* 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
- /* Special option types for padding. */
- #define IP6OPT_PAD1 0
- #define IP6OPT_PADN 1
- #endif /* netinet/ip6.h */