2 /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */
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63 * @(#)ip.h 8.1 (Berkeley) 6/10/93
66 #ifndef _NETINET_IP6_H_
67 #define _NETINET_IP6_H_
70 * Definition for internet protocol version 6.
77 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
78 u_int16_t ip6_un1_plen; /* payload length */
79 u_int8_t ip6_un1_nxt; /* next header */
80 u_int8_t ip6_un1_hlim; /* hop limit */
82 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
84 struct in6_addr ip6_src; /* source address */
85 struct in6_addr ip6_dst; /* destination address */
88 #define ip6_vfc ip6_ctlun.ip6_un2_vfc
89 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
90 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
91 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
92 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
93 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
95 #define IPV6_VERSION 0x60
96 #define IPV6_VERSION_MASK 0xf0
98 #if BYTE_ORDER == BIG_ENDIAN
99 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
100 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
102 #if BYTE_ORDER == LITTLE_ENDIAN
103 #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
104 #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
105 #endif /* LITTLE_ENDIAN */
107 #define IPV6_FLOWLABEL_LEN 20
118 /* Hop-by-Hop options header */
119 /* XXX should we pad it to force alignment on an 8-byte boundary? */
121 u_int8_t ip6h_nxt; /* next header */
122 u_int8_t ip6h_len; /* length in units of 8 octets */
123 /* followed by options */
126 /* Destination options header */
127 /* XXX should we pad it to force alignment on an 8-byte boundary? */
129 u_int8_t ip6d_nxt; /* next header */
130 u_int8_t ip6d_len; /* length in units of 8 octets */
131 /* followed by options */
134 /* Option types and related macros */
135 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
136 #define IP6OPT_PADN 0x01 /* 00 0 00001 */
137 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
138 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
139 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
141 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
143 #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */
145 #define IP6OPT_RTALERT_LEN 4
146 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
147 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
148 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
149 #define IP6OPT_MINLEN 2
151 #define IP6OPT_EID 0x8a /* 10 0 01010 */
153 #define IP6OPT_TYPE(o) ((o) & 0xC0)
154 #define IP6OPT_TYPE_SKIP 0x00
155 #define IP6OPT_TYPE_DISCARD 0x40
156 #define IP6OPT_TYPE_FORCEICMP 0x80
157 #define IP6OPT_TYPE_ICMP 0xC0
159 #define IP6OPT_MUTABLE 0x20
161 /* IPv6 options: common part */
167 /* Jumbo Payload Option */
168 struct ip6_opt_jumbo {
171 u_int8_t ip6oj_jumbo_len[4];
173 #define IP6OPT_JUMBO_LEN 6
175 /* NSAP Address Option */
176 struct ip6_opt_nsap {
179 u_int8_t ip6on_src_nsap_len;
180 u_int8_t ip6on_dst_nsap_len;
181 /* followed by source NSAP */
182 /* followed by destination NSAP */
185 /* Tunnel Limit Option */
186 struct ip6_opt_tunnel {
189 u_int8_t ip6ot_encap_limit;
192 /* Router Alert Option */
193 struct ip6_opt_router {
196 u_int8_t ip6or_value[2];
198 /* Router alert values (in network byte order) */
199 #if BYTE_ORDER == BIG_ENDIAN
200 #define IP6_ALERT_MLD 0x0000
201 #define IP6_ALERT_RSVP 0x0001
202 #define IP6_ALERT_AN 0x0002
204 #if BYTE_ORDER == LITTLE_ENDIAN
205 #define IP6_ALERT_MLD 0x0000
206 #define IP6_ALERT_RSVP 0x0100
207 #define IP6_ALERT_AN 0x0200
208 #endif /* LITTLE_ENDIAN */
213 u_int8_t ip6r_nxt; /* next header */
214 u_int8_t ip6r_len; /* length in units of 8 octets */
215 u_int8_t ip6r_type; /* routing type */
216 u_int8_t ip6r_segleft; /* segments left */
217 /* followed by routing type specific data */
220 /* Type 0 Routing header, deprecated by RFC 5095. */
222 u_int8_t ip6r0_nxt; /* next header */
223 u_int8_t ip6r0_len; /* length in units of 8 octets */
224 u_int8_t ip6r0_type; /* always zero */
225 u_int8_t ip6r0_segleft; /* segments left */
226 u_int32_t ip6r0_reserved; /* reserved field */
227 /* followed by up to 127 struct in6_addr */
230 /* Fragment header */
232 u_int8_t ip6f_nxt; /* next header */
233 u_int8_t ip6f_reserved; /* reserved field */
234 u_int16_t ip6f_offlg; /* offset, reserved, and flag */
235 u_int32_t ip6f_ident; /* identification */
238 #if BYTE_ORDER == BIG_ENDIAN
239 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
240 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
241 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
242 #else /* BYTE_ORDER == LITTLE_ENDIAN */
243 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
244 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
245 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
246 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
249 * Internet implementation parameters.
251 #define IPV6_MAXHLIM 255 /* maximum hoplimit */
252 #define IPV6_DEFHLIM 64 /* default hlim */
253 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
254 #define IPV6_HLIMDEC 1 /* subtracted when forwarding */
256 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
257 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
258 #define IPV6_MAXOPTHDR 2048 /* max option header size, 256 64-bit words */
260 #endif /* not _NETINET_IP6_H_ */