2 /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */
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61 * @(#)ip.h 8.1 (Berkeley) 6/10/93
64 #ifndef _NETINET_IP6_H_
65 #define _NETINET_IP6_H_
68 * Definition for internet protocol version 6.
75 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
76 u_int16_t ip6_un1_plen; /* payload length */
77 u_int8_t ip6_un1_nxt; /* next header */
78 u_int8_t ip6_un1_hlim; /* hop limit */
80 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
82 struct in6_addr ip6_src; /* source address */
83 struct in6_addr ip6_dst; /* destination address */
86 #define ip6_vfc ip6_ctlun.ip6_un2_vfc
87 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
88 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
89 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
90 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
91 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
93 #define IPV6_VERSION 0x60
94 #define IPV6_VERSION_MASK 0xf0
96 #if BYTE_ORDER == BIG_ENDIAN
97 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
98 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
100 #if BYTE_ORDER == LITTLE_ENDIAN
101 #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
102 #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
103 #endif /* LITTLE_ENDIAN */
105 #define IPV6_FLOWLABEL_LEN 20
107 /* ECN bits proposed by Sally Floyd */
108 #define IP6TOS_CE 0x01 /* congestion experienced */
109 #define IP6TOS_ECT 0x02 /* ECN-capable transport */
121 /* Hop-by-Hop options header */
122 /* XXX should we pad it to force alignment on an 8-byte boundary? */
124 u_int8_t ip6h_nxt; /* next header */
125 u_int8_t ip6h_len; /* length in units of 8 octets */
126 /* followed by options */
129 /* Destination options header */
130 /* XXX should we pad it to force alignment on an 8-byte boundary? */
132 u_int8_t ip6d_nxt; /* next header */
133 u_int8_t ip6d_len; /* length in units of 8 octets */
134 /* followed by options */
137 /* Option types and related macros */
138 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
139 #define IP6OPT_PADN 0x01 /* 00 0 00001 */
140 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
141 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
142 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
144 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
146 #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */
148 #define IP6OPT_RTALERT_LEN 4
149 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
150 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
151 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
152 #define IP6OPT_MINLEN 2
154 #define IP6OPT_EID 0x8a /* 10 0 01010 */
156 #define IP6OPT_TYPE(o) ((o) & 0xC0)
157 #define IP6OPT_TYPE_SKIP 0x00
158 #define IP6OPT_TYPE_DISCARD 0x40
159 #define IP6OPT_TYPE_FORCEICMP 0x80
160 #define IP6OPT_TYPE_ICMP 0xC0
162 #define IP6OPT_MUTABLE 0x20
164 /* IPv6 options: common part */
170 /* Jumbo Payload Option */
171 struct ip6_opt_jumbo {
174 u_int8_t ip6oj_jumbo_len[4];
176 #define IP6OPT_JUMBO_LEN 6
178 /* NSAP Address Option */
179 struct ip6_opt_nsap {
182 u_int8_t ip6on_src_nsap_len;
183 u_int8_t ip6on_dst_nsap_len;
184 /* followed by source NSAP */
185 /* followed by destination NSAP */
188 /* Tunnel Limit Option */
189 struct ip6_opt_tunnel {
192 u_int8_t ip6ot_encap_limit;
195 /* Router Alert Option */
196 struct ip6_opt_router {
199 u_int8_t ip6or_value[2];
201 /* Router alert values (in network byte order) */
202 #if BYTE_ORDER == BIG_ENDIAN
203 #define IP6_ALERT_MLD 0x0000
204 #define IP6_ALERT_RSVP 0x0001
205 #define IP6_ALERT_AN 0x0002
207 #if BYTE_ORDER == LITTLE_ENDIAN
208 #define IP6_ALERT_MLD 0x0000
209 #define IP6_ALERT_RSVP 0x0100
210 #define IP6_ALERT_AN 0x0200
211 #endif /* LITTLE_ENDIAN */
216 u_int8_t ip6r_nxt; /* next header */
217 u_int8_t ip6r_len; /* length in units of 8 octets */
218 u_int8_t ip6r_type; /* routing type */
219 u_int8_t ip6r_segleft; /* segments left */
220 /* followed by routing type specific data */
223 /* Type 0 Routing header, deprecated by RFC 5095. */
225 u_int8_t ip6r0_nxt; /* next header */
226 u_int8_t ip6r0_len; /* length in units of 8 octets */
227 u_int8_t ip6r0_type; /* always zero */
228 u_int8_t ip6r0_segleft; /* segments left */
229 u_int32_t ip6r0_reserved; /* reserved field */
230 /* followed by up to 127 struct in6_addr */
233 /* Fragment header */
235 u_int8_t ip6f_nxt; /* next header */
236 u_int8_t ip6f_reserved; /* reserved field */
237 u_int16_t ip6f_offlg; /* offset, reserved, and flag */
238 u_int32_t ip6f_ident; /* identification */
241 #if BYTE_ORDER == BIG_ENDIAN
242 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
243 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
244 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
245 #else /* BYTE_ORDER == LITTLE_ENDIAN */
246 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
247 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
248 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
249 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
252 * Internet implementation parameters.
254 #define IPV6_MAXHLIM 255 /* maximum hoplimit */
255 #define IPV6_DEFHLIM 64 /* default hlim */
256 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
257 #define IPV6_HLIMDEC 1 /* subtracted when forwarding */
259 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
260 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
261 #define IPV6_MAXOPTHDR 2048 /* max option header size, 256 64-bit words */
265 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
266 * target header (including IPv6 itself, extension headers and
267 * TCP/UDP/ICMP6 headers) are contiguous. KAME requires drivers
268 * to store incoming data into one internal mbuf or one or more external
269 * mbufs(never into two or more internal mbufs). Thus, the third case is
270 * supposed to never be matched but is prepared just in case.
273 #define IP6_EXTHDR_CHECK(m, off, hlen, ret) \
275 if ((m)->m_next != NULL) { \
276 if (((m)->m_flags & M_LOOP) && \
277 ((m)->m_len < (off) + (hlen)) && \
278 (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \
279 IP6STAT_INC(ip6s_exthdrtoolong); \
282 if ((m)->m_len < (off) + (hlen)) { \
283 IP6STAT_INC(ip6s_exthdrtoolong); \
289 if ((m)->m_len < (off) + (hlen)) { \
290 IP6STAT_INC(ip6s_tooshort); \
291 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \
296 } while (/*CONSTCOND*/ 0)
299 * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
300 * "len") is located in single mbuf, on contiguous memory region.
301 * The pointer to the region will be returned to pointer variable "val",
303 * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
304 * very top of mbuf. GET0 is likely to make memory copy than GET.
306 * XXX we're now testing this, needs m_pulldown()
308 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
312 if ((m)->m_len >= (off) + (len)) \
313 (val) = (typ)(mtod((m), caddr_t) + (off)); \
315 t = m_pulldown((m), (off), (len), &tmp); \
317 if (t->m_len < tmp + (len)) \
318 panic("m_pulldown malfunction"); \
319 (val) = (typ)(mtod(t, caddr_t) + tmp); \
325 } while (/*CONSTCOND*/ 0)
327 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
331 (val) = (typ)mtod(m, caddr_t); \
333 t = m_pulldown((m), (off), (len), NULL); \
335 if (t->m_len < (len)) \
336 panic("m_pulldown malfunction"); \
337 (val) = (typ)mtod(t, caddr_t); \
343 } while (/*CONSTCOND*/ 0)
347 #endif /* not _NETINET_IP6_H_ */