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[glibc.git] / inet / netinet / ip6.h
blob7045836df6f0ed02691df697fd12d67624f50c17
1 /* Copyright (C) 1991-1997, 2001, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #ifndef _NETINET_IP6_H
20 #define _NETINET_IP6_H 1
22 #include <inttypes.h>
23 #include <netinet/in.h>
25 struct ip6_hdr
27 union
29 struct ip6_hdrctl
31 uint32_t ip6_un1_flow; /* 4 bits version, 8 bits TC,
32 20 bits flow-ID */
33 uint16_t ip6_un1_plen; /* payload length */
34 uint8_t ip6_un1_nxt; /* next header */
35 uint8_t ip6_un1_hlim; /* hop limit */
36 } ip6_un1;
37 uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits tclass */
38 } ip6_ctlun;
39 struct in6_addr ip6_src; /* source address */
40 struct in6_addr ip6_dst; /* destination address */
43 #define ip6_vfc ip6_ctlun.ip6_un2_vfc
44 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
45 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
46 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
47 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
48 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
50 /* Generic extension header. */
51 struct ip6_ext
53 uint8_t ip6e_nxt; /* next header. */
54 uint8_t ip6e_len; /* length in units of 8 octets. */
57 /* Hop-by-Hop options header. */
58 struct ip6_hbh
60 uint8_t ip6h_nxt; /* next header. */
61 uint8_t ip6h_len; /* length in units of 8 octets. */
62 /* followed by options */
65 /* Destination options header */
66 struct ip6_dest
68 uint8_t ip6d_nxt; /* next header */
69 uint8_t ip6d_len; /* length in units of 8 octets */
70 /* followed by options */
73 /* Routing header */
74 struct ip6_rthdr
76 uint8_t ip6r_nxt; /* next header */
77 uint8_t ip6r_len; /* length in units of 8 octets */
78 uint8_t ip6r_type; /* routing type */
79 uint8_t ip6r_segleft; /* segments left */
80 /* followed by routing type specific data */
83 /* Type 0 Routing header */
84 struct ip6_rthdr0
86 uint8_t ip6r0_nxt; /* next header */
87 uint8_t ip6r0_len; /* length in units of 8 octets */
88 uint8_t ip6r0_type; /* always zero */
89 uint8_t ip6r0_segleft; /* segments left */
90 uint8_t ip6r0_reserved; /* reserved field */
91 uint8_t ip6r0_slmap[3]; /* strict/loose bit map */
92 struct in6_addr ip6r0_addr[1]; /* up to 23 addresses */
95 /* Fragment header */
96 struct ip6_frag
98 uint8_t ip6f_nxt; /* next header */
99 uint8_t ip6f_reserved; /* reserved field */
100 uint16_t ip6f_offlg; /* offset, reserved, and flag */
101 uint32_t ip6f_ident; /* identification */
104 #if BYTE_ORDER == BIG_ENDIAN
105 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
106 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
107 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
108 #else /* BYTE_ORDER == LITTLE_ENDIAN */
109 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
110 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
111 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
112 #endif
114 /* Special option types for padding. */
115 #define IP6OPT_PAD1 0
116 #define IP6OPT_PADN 1
118 #endif /* netinet/ip6.h */