5 /* $FreeBSD: src/sys/netinet/ip6.h,v 1.5 2001/06/11 12:39:00 ume Exp $ */
6 /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */
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69 * @(#)ip.h 8.1 (Berkeley) 6/10/93
72 #ifndef _NETINET_IP6_H_
73 #define _NETINET_IP6_H_
76 * Definition for internet protocol version 6.
80 #ifndef __SYS_WTYPES_H
81 #include <sys/wtypes.h>
84 #include <sys/packon.h>
89 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
90 u_int16_t ip6_un1_plen; /* payload length */
91 u_int8_t ip6_un1_nxt; /* next header */
92 u_int8_t ip6_un1_hlim; /* hop limit */
94 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
96 struct in6_addr ip6_src; /* source address */
97 struct in6_addr ip6_dst; /* destination address */
100 #define ip6_vfc ip6_ctlun.ip6_un2_vfc
101 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
102 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
103 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
104 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
105 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
107 #define IPV6_VERSION 0x60
108 #define IPV6_VERSION_MASK 0xf0
110 #if BYTE_ORDER == BIG_ENDIAN
111 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
112 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
114 #if BYTE_ORDER == LITTLE_ENDIAN
115 #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
116 #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
117 #endif /* LITTLE_ENDIAN */
121 /* ECN bits proposed by Sally Floyd */
122 #define IP6TOS_CE 0x01 /* congestion experienced */
123 #define IP6TOS_ECT 0x02 /* ECN-capable transport */
135 /* Hop-by-Hop options header */
136 /* XXX should we pad it to force alignment on an 8-byte boundary? */
138 u_int8_t ip6h_nxt; /* next header */
139 u_int8_t ip6h_len; /* length in units of 8 octets */
140 /* followed by options */
143 /* Destination options header */
144 /* XXX should we pad it to force alignment on an 8-byte boundary? */
146 u_int8_t ip6d_nxt; /* next header */
147 u_int8_t ip6d_len; /* length in units of 8 octets */
148 /* followed by options */
151 /* Option types and related macros */
152 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
153 #define IP6OPT_PADN 0x01 /* 00 0 00001 */
154 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
155 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
156 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
157 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
159 #define IP6OPT_RTALERT_LEN 4
160 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
161 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
162 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
163 #define IP6OPT_MINLEN 2
165 #define IP6OPT_BINDING_UPDATE 0xc6 /* 11 0 00110 */
166 #define IP6OPT_BINDING_ACK 0x07 /* 00 0 00111 */
167 #define IP6OPT_BINDING_REQ 0x08 /* 00 0 01000 */
168 #define IP6OPT_HOME_ADDRESS 0xc9 /* 11 0 01001 */
169 #define IP6OPT_EID 0x8a /* 10 0 01010 */
171 #define IP6OPT_TYPE(o) ((o) & 0xC0)
172 #define IP6OPT_TYPE_SKIP 0x00
173 #define IP6OPT_TYPE_DISCARD 0x40
174 #define IP6OPT_TYPE_FORCEICMP 0x80
175 #define IP6OPT_TYPE_ICMP 0xC0
177 #define IP6OPT_MUTABLE 0x20
179 #define IP6OPT_JUMBO_LEN 6
183 u_int8_t ip6r_nxt; /* next header */
184 u_int8_t ip6r_len; /* length in units of 8 octets */
185 u_int8_t ip6r_type; /* routing type */
186 u_int8_t ip6r_segleft; /* segments left */
187 /* followed by routing type specific data */
190 /* Type 0 Routing header */
192 u_int8_t ip6r0_nxt; /* next header */
193 u_int8_t ip6r0_len; /* length in units of 8 octets */
194 u_int8_t ip6r0_type; /* always zero */
195 u_int8_t ip6r0_segleft; /* segments left */
196 u_int8_t ip6r0_reserved; /* reserved field */
197 u_int8_t ip6r0_slmap[3]; /* strict/loose bit map */
198 struct in6_addr ip6r0_addr[1]; /* up to 23 addresses */
201 /* Fragment header */
203 u_int8_t ip6f_nxt; /* next header */
204 u_int8_t ip6f_reserved; /* reserved field */
205 u_int16_t ip6f_offlg; /* offset, reserved, and flag */
206 u_int32_t ip6f_ident; /* identification */
209 #include <sys/packoff.h>
211 #if BYTE_ORDER == BIG_ENDIAN
212 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
213 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
214 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
215 #else /* BYTE_ORDER == LITTLE_ENDIAN */
216 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
217 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
218 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
219 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
222 * Internet implementation parameters.
224 #define IPV6_MAXHLIM 255 /* maximun hoplimit */
225 #define IPV6_DEFHLIM 64 /* default hlim */
226 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
227 #define IPV6_HLIMDEC 1 /* subtracted when forwaeding */
229 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
230 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
234 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
235 * target header (including IPv6 itself, extension headers and
236 * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers
237 * to store incoming data into one internal mbuf or one or more external
238 * mbufs(never into two or more internal mbufs). Thus, the third case is
239 * supposed to never be matched but is prepared just in case.
242 #define IP6_EXTHDR_CHECK(m, off, hlen, ret) \
244 if ((m)->m_next != NULL) { \
245 if (((m)->m_flags & M_LOOP) && \
246 ((m)->m_len < (off) + (hlen)) && \
247 (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \
248 ip6stat.ip6s_exthdrtoolong++; \
250 } else if ((m)->m_flags & M_EXT) { \
251 if ((m)->m_len < (off) + (hlen)) { \
252 ip6stat.ip6s_exthdrtoolong++; \
257 if ((m)->m_len < (off) + (hlen)) { \
258 ip6stat.ip6s_exthdrtoolong++; \
264 if ((m)->m_len < (off) + (hlen)) { \
265 ip6stat.ip6s_tooshort++; \
266 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \
274 * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
275 * "len") is located in single mbuf, on contiguous memory region.
276 * The pointer to the region will be returned to pointer variable "val",
278 * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
279 * very top of mbuf. GET0 is likely to make memory copy than GET.
281 * XXX we're now testing this, needs m_pulldown()
283 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
287 if ((m)->m_len >= (off) + (len)) \
288 (val) = (typ)(mtod((m), caddr_t) + (off)); \
290 t = m_pulldown((m), (off), (len), &tmp); \
292 if (t->m_len < tmp + (len)) \
293 panic("m_pulldown malfunction"); \
294 (val) = (typ)(mtod(t, caddr_t) + tmp); \
302 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
306 (val) = (typ)mtod(m, caddr_t); \
308 t = m_pulldown((m), (off), (len), NULL); \
310 if (t->m_len < (len)) \
311 panic("m_pulldown malfunction"); \
312 (val) = (typ)mtod(t, caddr_t); \
321 #endif /* not _NETINET_IP6_H_ */