1 /* $FreeBSD: src/sys/netinet/ip6.h,v 1.2.2.2 2001/07/03 11:01:46 ume Exp $ */
2 /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */
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65 * @(#)ip.h 8.1 (Berkeley) 6/10/93
68 #ifndef _NETINET_IP6_H_
69 #define _NETINET_IP6_H_
72 * Definition for internet protocol version 6.
79 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
80 u_int16_t ip6_un1_plen; /* payload length */
81 u_int8_t ip6_un1_nxt; /* next header */
82 u_int8_t ip6_un1_hlim; /* hop limit */
84 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
86 struct in6_addr ip6_src; /* source address */
87 struct in6_addr ip6_dst; /* destination address */
88 } __attribute__((__packed__));
90 #define ip6_vfc ip6_ctlun.ip6_un2_vfc
91 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
92 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
93 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
94 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
95 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
97 #define IPV6_VERSION 0x60
98 #define IPV6_VERSION_MASK 0xf0
100 #if BYTE_ORDER == BIG_ENDIAN
101 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
102 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
104 #if BYTE_ORDER == LITTLE_ENDIAN
105 #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
106 #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
107 #endif /* LITTLE_ENDIAN */
110 /* ECN bits proposed by Sally Floyd */
111 #define IP6TOS_CE 0x01 /* congestion experienced */
112 #define IP6TOS_ECT 0x02 /* ECN-capable transport */
122 } __attribute__((__packed__));
124 /* Hop-by-Hop options header */
125 /* XXX should we pad it to force alignment on an 8-byte boundary? */
127 u_int8_t ip6h_nxt; /* next header */
128 u_int8_t ip6h_len; /* length in units of 8 octets */
129 /* followed by options */
130 } __attribute__((__packed__));
132 /* Destination options header */
133 /* XXX should we pad it to force alignment on an 8-byte boundary? */
135 u_int8_t ip6d_nxt; /* next header */
136 u_int8_t ip6d_len; /* length in units of 8 octets */
137 /* followed by options */
138 } __attribute__((__packed__));
140 /* Option types and related macros */
141 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
142 #define IP6OPT_PADN 0x01 /* 00 0 00001 */
143 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
144 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
145 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
146 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
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_BINDING_UPDATE 0xc6 /* 11 0 00110 */
155 #define IP6OPT_BINDING_ACK 0x07 /* 00 0 00111 */
156 #define IP6OPT_BINDING_REQ 0x08 /* 00 0 01000 */
157 #define IP6OPT_HOME_ADDRESS 0xc9 /* 11 0 01001 */
158 #define IP6OPT_EID 0x8a /* 10 0 01010 */
160 #define IP6OPT_TYPE(o) ((o) & 0xC0)
161 #define IP6OPT_TYPE_SKIP 0x00
162 #define IP6OPT_TYPE_DISCARD 0x40
163 #define IP6OPT_TYPE_FORCEICMP 0x80
164 #define IP6OPT_TYPE_ICMP 0xC0
166 #define IP6OPT_MUTABLE 0x20
168 #define IP6OPT_JUMBO_LEN 6
172 u_int8_t ip6r_nxt; /* next header */
173 u_int8_t ip6r_len; /* length in units of 8 octets */
174 u_int8_t ip6r_type; /* routing type */
175 u_int8_t ip6r_segleft; /* segments left */
176 /* followed by routing type specific data */
177 } __attribute__((__packed__));
179 /* Type 0 Routing header */
181 u_int8_t ip6r0_nxt; /* next header */
182 u_int8_t ip6r0_len; /* length in units of 8 octets */
183 u_int8_t ip6r0_type; /* always zero */
184 u_int8_t ip6r0_segleft; /* segments left */
185 u_int8_t ip6r0_reserved; /* reserved field */
186 u_int8_t ip6r0_slmap[3]; /* strict/loose bit map */
187 struct in6_addr ip6r0_addr[1]; /* up to 23 addresses */
188 } __attribute__((__packed__));
190 /* Fragment header */
192 u_int8_t ip6f_nxt; /* next header */
193 u_int8_t ip6f_reserved; /* reserved field */
194 u_int16_t ip6f_offlg; /* offset, reserved, and flag */
195 u_int32_t ip6f_ident; /* identification */
196 } __attribute__((__packed__));
198 #if BYTE_ORDER == BIG_ENDIAN
199 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
200 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
201 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
202 #else /* BYTE_ORDER == LITTLE_ENDIAN */
203 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
204 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
205 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
206 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
209 * Internet implementation parameters.
211 #define IPV6_MAXHLIM 255 /* maximun hoplimit */
212 #define IPV6_DEFHLIM 64 /* default hlim */
213 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
214 #define IPV6_HLIMDEC 1 /* subtracted when forwaeding */
216 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
217 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
221 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
222 * target header (including IPv6 itself, extension headers and
223 * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers
224 * to store incoming data into one internal mbuf or one or more external
225 * mbufs(never into two or more internal mbufs). Thus, the third case is
226 * supposed to never be matched but is prepared just in case.
229 #define IP6_EXTHDR_CHECK(m, off, hlen, ret) \
231 if ((m)->m_next != NULL) { \
232 if (((m)->m_flags & M_LOOP) && \
233 ((m)->m_len < (off) + (hlen)) && \
234 (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \
235 ip6stat.ip6s_exthdrtoolong++; \
237 } else if ((m)->m_flags & M_EXT) { \
238 if ((m)->m_len < (off) + (hlen)) { \
239 ip6stat.ip6s_exthdrtoolong++; \
244 if ((m)->m_len < (off) + (hlen)) { \
245 ip6stat.ip6s_exthdrtoolong++; \
251 if ((m)->m_len < (off) + (hlen)) { \
252 ip6stat.ip6s_tooshort++; \
253 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \
261 * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
262 * "len") is located in single mbuf, on contiguous memory region.
263 * The pointer to the region will be returned to pointer variable "val",
265 * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
266 * very top of mbuf. GET0 is likely to make memory copy than GET.
268 * XXX we're now testing this, needs m_pulldown()
270 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
274 if ((m)->m_len >= (off) + (len)) \
275 (val) = (typ)(mtod((m), caddr_t) + (off)); \
277 t = m_pulldown((m), (off), (len), &tmp); \
279 if (t->m_len < tmp + (len)) \
280 panic("m_pulldown malfunction"); \
281 (val) = (typ)(mtod(t, caddr_t) + tmp); \
289 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
293 (val) = (typ)mtod(m, caddr_t); \
295 t = m_pulldown((m), (off), (len), NULL); \
297 if (t->m_len < (len)) \
298 panic("m_pulldown malfunction"); \
299 (val) = (typ)mtod(t, caddr_t); \
308 #endif /* not _NETINET_IP6_H_ */