1 /* $FreeBSD: src/sys/netinet/ip6.h,v 1.2.2.2 2001/07/03 11:01:46 ume Exp $ */
2 /* $DragonFly: src/sys/netinet/ip6.h,v 1.8 2008/09/04 09:08:22 hasso Exp $ */
3 /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */
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66 * @(#)ip.h 8.1 (Berkeley) 6/10/93
69 #ifndef _NETINET_IP6_H_
70 #define _NETINET_IP6_H_
73 #include <sys/types.h>
75 #ifndef _NETINET_IN_H_
76 #include <netinet/in.h>
78 #ifndef _MACHINE_ENDIAN_H_
79 #include <machine/endian.h>
84 * Definition for internet protocol version 6.
91 u_int32_t ip6_un1_flow
; /* 20 bits of flow-ID */
92 u_int16_t ip6_un1_plen
; /* payload length */
93 u_int8_t ip6_un1_nxt
; /* next header */
94 u_int8_t ip6_un1_hlim
; /* hop limit */
96 u_int8_t ip6_un2_vfc
; /* 4 bits version, top 4 bits class */
98 struct in6_addr ip6_src
; /* source address */
99 struct in6_addr ip6_dst
; /* destination address */
100 } __attribute__((__packed__
));
102 #define ip6_vfc ip6_ctlun.ip6_un2_vfc
103 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
104 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
105 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
106 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
107 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
109 #define IPV6_VERSION 0x60
110 #define IPV6_VERSION_MASK 0xf0
112 #if _BYTE_ORDER == _BIG_ENDIAN
113 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
114 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
115 #elif _BYTE_ORDER == _LITTLE_ENDIAN
116 #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
117 #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
119 #error "Byte order not implemented"
122 /* ECN bits proposed by Sally Floyd */
123 #define IP6TOS_CE 0x01 /* congestion experienced */
124 #define IP6TOS_ECT 0x02 /* ECN-capable transport */
134 } __attribute__((__packed__
));
136 /* Hop-by-Hop options header */
137 /* XXX should we pad it to force alignment on an 8-byte boundary? */
139 u_int8_t ip6h_nxt
; /* next header */
140 u_int8_t ip6h_len
; /* length in units of 8 octets */
141 /* followed by options */
142 } __attribute__((__packed__
));
144 /* Destination options header */
145 /* XXX should we pad it to force alignment on an 8-byte boundary? */
147 u_int8_t ip6d_nxt
; /* next header */
148 u_int8_t ip6d_len
; /* length in units of 8 octets */
149 /* followed by options */
150 } __attribute__((__packed__
));
152 /* Option types and related macros */
153 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
154 #define IP6OPT_PADN 0x01 /* 00 0 00001 */
155 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
156 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
157 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
158 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
160 #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */
161 #define IP6OPT_RTALERT_LEN 4
162 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
163 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
164 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
165 #define IP6OPT_MINLEN 2
167 #define IP6OPT_BINDING_UPDATE 0xc6 /* 11 0 00110 */
168 #define IP6OPT_BINDING_ACK 0x07 /* 00 0 00111 */
169 #define IP6OPT_BINDING_REQ 0x08 /* 00 0 01000 */
170 #define IP6OPT_HOME_ADDRESS 0xc9 /* 11 0 01001 */
171 #define IP6OPT_EID 0x8a /* 10 0 01010 */
173 #define IP6OPT_TYPE(o) ((o) & 0xC0)
174 #define IP6OPT_TYPE_SKIP 0x00
175 #define IP6OPT_TYPE_DISCARD 0x40
176 #define IP6OPT_TYPE_FORCEICMP 0x80
177 #define IP6OPT_TYPE_ICMP 0xC0
179 #define IP6OPT_MUTABLE 0x20
181 /* Jumbo Payload Option */
182 struct ip6_opt_jumbo
{
185 u_int8_t ip6oj_jumbo_len
[4];
186 } __attribute__((__packed__
));
187 #define IP6OPT_JUMBO_LEN 6
189 /* IPv6 options: common part */
193 } __attribute__((__packed__
));
196 /* NSAP Address Option */
197 struct ip6_opt_nsap
{
200 u_int8_t ip6on_src_nsap_len
;
201 u_int8_t ip6on_dst_nsap_len
;
202 /* followed by source NSAP */
203 /* followed by destination NSAP */
204 } __attribute__((__packed__
));
206 /* Tunnel Limit Option */
207 struct ip6_opt_tunnel
{
210 u_int8_t ip6ot_encap_limit
;
211 } __attribute__((__packed__
));
213 /* Router Alert Option */
214 struct ip6_opt_router
{
217 u_int8_t ip6or_value
[2];
218 } __attribute__((__packed__
));
220 /* Router alert values (in network byte order) */
221 #if BYTE_ORDER == BIG_ENDIAN
222 #define IP6_ALERT_MLD 0x0000
223 #define IP6_ALERT_RSVP 0x0001
224 #define IP6_ALERT_AN 0x0002
226 #if BYTE_ORDER == LITTLE_ENDIAN
227 #define IP6_ALERT_MLD 0x0000
228 #define IP6_ALERT_RSVP 0x0100
229 #define IP6_ALERT_AN 0x0200
230 #endif /* LITTLE_ENDIAN */
235 u_int8_t ip6r_nxt
; /* next header */
236 u_int8_t ip6r_len
; /* length in units of 8 octets */
237 u_int8_t ip6r_type
; /* routing type */
238 u_int8_t ip6r_segleft
; /* segments left */
239 /* followed by routing type specific data */
240 } __attribute__((__packed__
));
242 /* Fragment header */
244 u_int8_t ip6f_nxt
; /* next header */
245 u_int8_t ip6f_reserved
; /* reserved field */
246 u_int16_t ip6f_offlg
; /* offset, reserved, and flag */
247 u_int32_t ip6f_ident
; /* identification */
248 } __attribute__((__packed__
));
250 #if _BYTE_ORDER == _BIG_ENDIAN
251 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
252 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
253 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
254 #elif _BYTE_ORDER == _LITTLE_ENDIAN
255 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
256 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
257 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
259 #error "Byte order not implemented"
263 * Internet implementation parameters.
265 #define IPV6_MAXHLIM 255 /* maximun hoplimit */
266 #define IPV6_DEFHLIM 64 /* default hlim */
267 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
268 #define IPV6_HLIMDEC 1 /* subtracted when forwaeding */
270 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
271 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
275 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
276 * target header (including IPv6 itself, extension headers and
277 * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers
278 * to store incoming data into one internal mbuf or one or more external
279 * mbufs(never into two or more internal mbufs). Thus, the third case is
280 * supposed to never be matched but is prepared just in case.
283 #define IP6_EXTHDR_CHECK(m, off, hlen, ret) \
285 if ((m)->m_next != NULL) { \
286 if (((m)->m_flags & M_LOOP) && \
287 ((m)->m_len < (off) + (hlen)) && \
288 (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \
289 ip6stat.ip6s_exthdrtoolong++; \
291 } else if ((m)->m_flags & M_EXT) { \
292 if ((m)->m_len < (off) + (hlen)) { \
293 ip6stat.ip6s_exthdrtoolong++; \
298 if ((m)->m_len < (off) + (hlen)) { \
299 ip6stat.ip6s_exthdrtoolong++; \
305 if ((m)->m_len < (off) + (hlen)) { \
306 ip6stat.ip6s_tooshort++; \
307 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \
314 #define IP6_EXTHDR_CHECK_VOIDRET(m, off, hlen) \
315 IP6_EXTHDR_CHECK(m, off, hlen, )
318 * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
319 * "len") is located in single mbuf, on contiguous memory region.
320 * The pointer to the region will be returned to pointer variable "val",
322 * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
323 * very top of mbuf. GET0 is likely to make memory copy than GET.
325 * XXX we're now testing this, needs m_pulldown()
327 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
331 if ((m)->m_len >= (off) + (len)) \
332 (val) = (typ)(mtod((m), caddr_t) + (off)); \
334 t = m_pulldown((m), (off), (len), &tmp); \
336 if (t->m_len < tmp + (len)) \
337 panic("m_pulldown malfunction"); \
338 (val) = (typ)(mtod(t, caddr_t) + tmp); \
346 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
350 (val) = (typ)mtod(m, caddr_t); \
352 t = m_pulldown((m), (off), (len), NULL); \
354 if (t->m_len < (len)) \
355 panic("m_pulldown malfunction"); \
356 (val) = (typ)mtod(t, caddr_t); \
365 #endif /* not _NETINET_IP6_H_ */