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001: /* Copyright (C) 1991-1997, 2001, 2003, 2006 Free Software Foundation, Inc.
002:    This file is part of the GNU C Library.
003: 
004:    The GNU C Library is free software; you can redistribute it and/or
005:    modify it under the terms of the GNU Lesser General Public
006:    License as published by the Free Software Foundation; either
007:    version 2.1 of the License, or (at your option) any later version.
008: 
009:    The GNU C Library is distributed in the hope that it will be useful,
010:    but WITHOUT ANY WARRANTY; without even the implied warranty of
011:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
012:    Lesser General Public License for more details.
013: 
014:    You should have received a copy of the GNU Lesser General Public
015:    License along with the GNU C Library; if not, write to the Free
016:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
017:    02111-1307 USA.  */
018: 
019: #ifndef _NETINET_IP6_H
020: #define _NETINET_IP6_H 1
021: 
022: #include <inttypes.h>
023: #include <netinet/in.h>
024: 
025: struct ip6_hdr
026:   {
027:     union
028:       {
029:         struct ip6_hdrctl
030:           {
031:             uint32_t ip6_un1_flow;   /* 4 bits version, 8 bits TC,
032:                                         20 bits flow-ID */
033:             uint16_t ip6_un1_plen;   /* payload length */
034:             uint8_t  ip6_un1_nxt;    /* next header */
035:             uint8_t  ip6_un1_hlim;   /* hop limit */
036:           } ip6_un1;
037:         uint8_t ip6_un2_vfc;       /* 4 bits version, top 4 bits tclass */
038:       } ip6_ctlun;
039:     struct in6_addr ip6_src;      /* source address */
040:     struct in6_addr ip6_dst;      /* destination address */
041:   };
042: 
043: #define ip6_vfc   ip6_ctlun.ip6_un2_vfc
044: #define ip6_flow  ip6_ctlun.ip6_un1.ip6_un1_flow
045: #define ip6_plen  ip6_ctlun.ip6_un1.ip6_un1_plen
046: #define ip6_nxt   ip6_ctlun.ip6_un1.ip6_un1_nxt
047: #define ip6_hlim  ip6_ctlun.ip6_un1.ip6_un1_hlim
048: #define ip6_hops  ip6_ctlun.ip6_un1.ip6_un1_hlim
049: 
050: /* Generic extension header.  */
051: struct ip6_ext
052:   {
053:     uint8_t  ip6e_nxt;          /* next header.  */
054:     uint8_t  ip6e_len;          /* length in units of 8 octets.  */
055:   };
056: 
057: /* Hop-by-Hop options header.  */
058: struct ip6_hbh
059:   {
060:     uint8_t  ip6h_nxt;          /* next header.  */
061:     uint8_t  ip6h_len;          /* length in units of 8 octets.  */
062:     /* followed by options */
063:   };
064: 
065: /* Destination options header */
066: struct ip6_dest
067:   {
068:     uint8_t  ip6d_nxt;          /* next header */
069:     uint8_t  ip6d_len;          /* length in units of 8 octets */
070:     /* followed by options */
071:   };
072: 
073: /* Routing header */
074: struct ip6_rthdr
075:   {
076:     uint8_t  ip6r_nxt;          /* next header */
077:     uint8_t  ip6r_len;          /* length in units of 8 octets */
078:     uint8_t  ip6r_type;         /* routing type */
079:     uint8_t  ip6r_segleft;      /* segments left */
080:     /* followed by routing type specific data */
081:   };
082: 
083: /* Type 0 Routing header */
084: struct ip6_rthdr0
085:   {
086:     uint8_t  ip6r0_nxt;         /* next header */
087:     uint8_t  ip6r0_len;         /* length in units of 8 octets */
088:     uint8_t  ip6r0_type;        /* always zero */
089:     uint8_t  ip6r0_segleft;     /* segments left */
090:     uint8_t  ip6r0_reserved;    /* reserved field */
091:     uint8_t  ip6r0_slmap[3];    /* strict/loose bit map */
092:     /* followed by up to 127 struct in6_addr */
093:     struct in6_addr ip6r0_addr[0];
094:   };
095: 
096: /* Fragment header */
097: struct ip6_frag
098:   {
099:     uint8_t   ip6f_nxt;         /* next header */
100:     uint8_t   ip6f_reserved;    /* reserved field */
101:     uint16_t  ip6f_offlg;       /* offset, reserved, and flag */
102:     uint32_t  ip6f_ident;       /* identification */
103:   };
104: 
105: #if BYTE_ORDER == BIG_ENDIAN
106: # define IP6F_OFF_MASK       0xfff8  /* mask out offset from _offlg */
107: # define IP6F_RESERVED_MASK  0x0006  /* reserved bits in ip6f_offlg */
108: # define IP6F_MORE_FRAG      0x0001  /* more-fragments flag */
109: #else   /* BYTE_ORDER == LITTLE_ENDIAN */
110: # define IP6F_OFF_MASK       0xf8ff  /* mask out offset from _offlg */
111: # define IP6F_RESERVED_MASK  0x0600  /* reserved bits in ip6f_offlg */
112: # define IP6F_MORE_FRAG      0x0100  /* more-fragments flag */
113: #endif
114: 
115: /* IPv6 options */
116: struct ip6_opt
117:   {
118:     uint8_t  ip6o_type;
119:     uint8_t  ip6o_len;
120:   };
121: 
122: /* The high-order 3 bits of the option type define the behavior
123:  * when processing an unknown option and whether or not the option
124:  * content changes in flight.
125:  */
126: #define IP6OPT_TYPE(o)          ((o) & 0xc0)
127: #define IP6OPT_TYPE_SKIP        0x00
128: #define IP6OPT_TYPE_DISCARD     0x40
129: #define IP6OPT_TYPE_FORCEICMP   0x80
130: #define IP6OPT_TYPE_ICMP        0xc0
131: #define IP6OPT_TYPE_MUTABLE     0x20
132: 
133: /* Special option types for padding.  */
134: #define IP6OPT_PAD1     0
135: #define IP6OPT_PADN     1
136: 
137: #define IP6OPT_JUMBO            0xc2
138: #define IP6OPT_NSAP_ADDR        0xc3
139: #define IP6OPT_TUNNEL_LIMIT     0x04
140: #define IP6OPT_ROUTER_ALERT     0x05
141: 
142: /* Jumbo Payload Option */
143: struct ip6_opt_jumbo
144:   {
145:     uint8_t  ip6oj_type;
146:     uint8_t  ip6oj_len;
147:     uint8_t  ip6oj_jumbo_len[4];
148:   };
149: #define IP6OPT_JUMBO_LEN        6
150: 
151: /* NSAP Address Option */
152: struct ip6_opt_nsap
153:   {
154:     uint8_t  ip6on_type;
155:     uint8_t  ip6on_len;
156:     uint8_t  ip6on_src_nsap_len;
157:     uint8_t  ip6on_dst_nsap_len;
158:       /* followed by source NSAP */
159:       /* followed by destination NSAP */
160:   };
161: 
162: /* Tunnel Limit Option */
163: struct ip6_opt_tunnel
164:   {
165:     uint8_t  ip6ot_type;
166:     uint8_t  ip6ot_len;
167:     uint8_t  ip6ot_encap_limit;
168:   };
169: 
170: /* Router Alert Option */
171: struct ip6_opt_router
172:   {
173:     uint8_t  ip6or_type;
174:     uint8_t  ip6or_len;
175:     uint8_t  ip6or_value[2];
176:   };
177: 
178: /* Router alert values (in network byte order) */
179: #if BYTE_ORDER == BIG_ENDIAN
180: # define IP6_ALERT_MLD  0x0000
181: # define IP6_ALERT_RSVP 0x0001
182: # define IP6_ALERT_AN   0x0002
183: #else /* BYTE_ORDER == LITTLE_ENDING */
184: # define IP6_ALERT_MLD  0x0000
185: # define IP6_ALERT_RSVP 0x0100
186: # define IP6_ALERT_AN   0x0200
187: #endif
188: 
189: #endif /* netinet/ip6.h */
190: 

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