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1 office 1 /**
2 * @file
3 * IPv6 protocol definitions
4 */
5  
6 /*
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30 * OF SUCH DAMAGE.
31 *
32 * This file is part of the lwIP TCP/IP stack.
33 *
34 * Author: Adam Dunkels <adam@sics.se>
35 *
36 */
37 #ifndef LWIP_HDR_PROT_IP6_H
38 #define LWIP_HDR_PROT_IP6_H
39  
40 #include "lwip/arch.h"
41 #include "lwip/ip6_addr.h"
42  
43 #ifdef __cplusplus
44 extern "C" {
45 #endif
46  
47 /** This is the packed version of ip6_addr_t,
48 used in network headers that are itself packed */
49 #ifdef PACK_STRUCT_USE_INCLUDES
50 # include "arch/bpstruct.h"
51 #endif
52 PACK_STRUCT_BEGIN
53 struct ip6_addr_packed {
54 PACK_STRUCT_FIELD(u32_t addr[4]);
55 } PACK_STRUCT_STRUCT;
56 PACK_STRUCT_END
57 #ifdef PACK_STRUCT_USE_INCLUDES
58 # include "arch/epstruct.h"
59 #endif
60 typedef struct ip6_addr_packed ip6_addr_p_t;
61  
62 #define IP6_HLEN 40
63  
64 #define IP6_NEXTH_HOPBYHOP 0
65 #define IP6_NEXTH_TCP 6
66 #define IP6_NEXTH_UDP 17
67 #define IP6_NEXTH_ENCAPS 41
68 #define IP6_NEXTH_ROUTING 43
69 #define IP6_NEXTH_FRAGMENT 44
70 #define IP6_NEXTH_ICMP6 58
71 #define IP6_NEXTH_NONE 59
72 #define IP6_NEXTH_DESTOPTS 60
73 #define IP6_NEXTH_UDPLITE 136
74  
75 /** The IPv6 header. */
76 #ifdef PACK_STRUCT_USE_INCLUDES
77 # include "arch/bpstruct.h"
78 #endif
79 PACK_STRUCT_BEGIN
80 struct ip6_hdr {
81 /** version / traffic class / flow label */
82 PACK_STRUCT_FIELD(u32_t _v_tc_fl);
83 /** payload length */
84 PACK_STRUCT_FIELD(u16_t _plen);
85 /** next header */
86 PACK_STRUCT_FLD_8(u8_t _nexth);
87 /** hop limit */
88 PACK_STRUCT_FLD_8(u8_t _hoplim);
89 /** source and destination IP addresses */
90 PACK_STRUCT_FLD_S(ip6_addr_p_t src);
91 PACK_STRUCT_FLD_S(ip6_addr_p_t dest);
92 } PACK_STRUCT_STRUCT;
93 PACK_STRUCT_END
94 #ifdef PACK_STRUCT_USE_INCLUDES
95 # include "arch/epstruct.h"
96 #endif
97 #define IP6H_V(hdr) ((lwip_ntohl((hdr)->_v_tc_fl) >> 28) & 0x0f)
98 #define IP6H_TC(hdr) ((lwip_ntohl((hdr)->_v_tc_fl) >> 20) & 0xff)
99 #define IP6H_FL(hdr) (lwip_ntohl((hdr)->_v_tc_fl) & 0x000fffff)
100 #define IP6H_PLEN(hdr) (lwip_ntohs((hdr)->_plen))
101 #define IP6H_NEXTH(hdr) ((hdr)->_nexth)
102 #define IP6H_NEXTH_P(hdr) ((u8_t *)(hdr) + 6)
103 #define IP6H_HOPLIM(hdr) ((hdr)->_hoplim)
104 #define IP6H_VTCFL_SET(hdr, v, tc, fl) (hdr)->_v_tc_fl = (lwip_htonl((((u32_t)(v)) << 28) | (((u32_t)(tc)) << 20) | (fl)))
105 #define IP6H_PLEN_SET(hdr, plen) (hdr)->_plen = lwip_htons(plen)
106 #define IP6H_NEXTH_SET(hdr, nexth) (hdr)->_nexth = (nexth)
107 #define IP6H_HOPLIM_SET(hdr, hl) (hdr)->_hoplim = (u8_t)(hl)
108  
109 /* ipv6 extended options header */
110 #define IP6_PAD1_OPTION 0
111 #define IP6_PADN_OPTION 1
112 #define IP6_ROUTER_ALERT_OPTION 5
113 #define IP6_JUMBO_OPTION 194
114 #define IP6_HOME_ADDRESS_OPTION 201
115 #define IP6_ROUTER_ALERT_DLEN 2
116 #define IP6_ROUTER_ALERT_VALUE_MLD 0
117  
118 #ifdef PACK_STRUCT_USE_INCLUDES
119 # include "arch/bpstruct.h"
120 #endif
121 PACK_STRUCT_BEGIN
122 struct ip6_opt_hdr {
123 /* router alert option type */
124 PACK_STRUCT_FLD_8(u8_t _opt_type);
125 /* router alert option data len */
126 PACK_STRUCT_FLD_8(u8_t _opt_dlen);
127 } PACK_STRUCT_STRUCT;
128 PACK_STRUCT_END
129 #ifdef PACK_STRUCT_USE_INCLUDES
130 # include "arch/epstruct.h"
131 #endif
132 #define IP6_OPT_HLEN 2
133 #define IP6_OPT_TYPE_ACTION(hdr) ((((hdr)->_opt_type) >> 6) & 0x3)
134 #define IP6_OPT_TYPE_CHANGE(hdr) ((((hdr)->_opt_type) >> 5) & 0x1)
135 #define IP6_OPT_TYPE(hdr) ((hdr)->_opt_type)
136 #define IP6_OPT_DLEN(hdr) ((hdr)->_opt_dlen)
137  
138 /* Hop-by-Hop header. */
139 #define IP6_HBH_HLEN 2
140  
141 #ifdef PACK_STRUCT_USE_INCLUDES
142 # include "arch/bpstruct.h"
143 #endif
144 PACK_STRUCT_BEGIN
145 struct ip6_hbh_hdr {
146 /* next header */
147 PACK_STRUCT_FLD_8(u8_t _nexth);
148 /* header length in 8-octet units */
149 PACK_STRUCT_FLD_8(u8_t _hlen);
150 } PACK_STRUCT_STRUCT;
151 PACK_STRUCT_END
152 #ifdef PACK_STRUCT_USE_INCLUDES
153 # include "arch/epstruct.h"
154 #endif
155 #define IP6_HBH_NEXTH(hdr) ((hdr)->_nexth)
156  
157 /* Destination header. */
158 #define IP6_DEST_HLEN 2
159  
160 #ifdef PACK_STRUCT_USE_INCLUDES
161 # include "arch/bpstruct.h"
162 #endif
163 PACK_STRUCT_BEGIN
164 struct ip6_dest_hdr {
165 /* next header */
166 PACK_STRUCT_FLD_8(u8_t _nexth);
167 /* header length in 8-octet units */
168 PACK_STRUCT_FLD_8(u8_t _hlen);
169 } PACK_STRUCT_STRUCT;
170 PACK_STRUCT_END
171 #ifdef PACK_STRUCT_USE_INCLUDES
172 # include "arch/epstruct.h"
173 #endif
174 #define IP6_DEST_NEXTH(hdr) ((hdr)->_nexth)
175  
176 /* Routing header */
177 #define IP6_ROUT_TYPE2 2
178 #define IP6_ROUT_RPL 3
179  
180 #ifdef PACK_STRUCT_USE_INCLUDES
181 # include "arch/bpstruct.h"
182 #endif
183 PACK_STRUCT_BEGIN
184 struct ip6_rout_hdr {
185 /* next header */
186 PACK_STRUCT_FLD_8(u8_t _nexth);
187 /* reserved */
188 PACK_STRUCT_FLD_8(u8_t _hlen);
189 /* fragment offset */
190 PACK_STRUCT_FIELD(u8_t _routing_type);
191 /* fragmented packet identification */
192 PACK_STRUCT_FIELD(u8_t _segments_left);
193 } PACK_STRUCT_STRUCT;
194 PACK_STRUCT_END
195 #ifdef PACK_STRUCT_USE_INCLUDES
196 # include "arch/epstruct.h"
197 #endif
198 #define IP6_ROUT_NEXTH(hdr) ((hdr)->_nexth)
199 #define IP6_ROUT_TYPE(hdr) ((hdr)->_routing_type)
200 #define IP6_ROUT_SEG_LEFT(hdr) ((hdr)->_segments_left)
201  
202 /* Fragment header. */
203 #define IP6_FRAG_HLEN 8
204 #define IP6_FRAG_OFFSET_MASK 0xfff8
205 #define IP6_FRAG_MORE_FLAG 0x0001
206  
207 #ifdef PACK_STRUCT_USE_INCLUDES
208 # include "arch/bpstruct.h"
209 #endif
210 PACK_STRUCT_BEGIN
211 struct ip6_frag_hdr {
212 /* next header */
213 PACK_STRUCT_FLD_8(u8_t _nexth);
214 /* reserved */
215 PACK_STRUCT_FLD_8(u8_t reserved);
216 /* fragment offset */
217 PACK_STRUCT_FIELD(u16_t _fragment_offset);
218 /* fragmented packet identification */
219 PACK_STRUCT_FIELD(u32_t _identification);
220 } PACK_STRUCT_STRUCT;
221 PACK_STRUCT_END
222 #ifdef PACK_STRUCT_USE_INCLUDES
223 # include "arch/epstruct.h"
224 #endif
225 #define IP6_FRAG_NEXTH(hdr) ((hdr)->_nexth)
226 #define IP6_FRAG_MBIT(hdr) (lwip_ntohs((hdr)->_fragment_offset) & 0x1)
227 #define IP6_FRAG_ID(hdr) (lwip_ntohl((hdr)->_identification))
228  
229 #ifdef __cplusplus
230 }
231 #endif
232  
233 #endif /* LWIP_HDR_PROT_IP6_H */