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1 | /* |
1 | /* |
2 | * Copyright (c) 2009 Lukas Mejdrech |
2 | * Copyright (c) 2009 Lukas Mejdrech |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup ip |
29 | /** @addtogroup ip |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** @file |
33 | /** @file |
34 | * IP header and options definitions. |
34 | * IP header and options definitions. |
35 | * Based on the RFC~791. |
35 | * Based on the RFC~791. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #ifndef __NET_IP_HEADER_H__ |
38 | #ifndef __NET_IP_HEADER_H__ |
39 | #define __NET_IP_HEADER_H__ |
39 | #define __NET_IP_HEADER_H__ |
40 | 40 | ||
41 | #include <byteorder.h> |
41 | #include <byteorder.h> |
42 | #include <sys/types.h> |
42 | #include <sys/types.h> |
43 | 43 | ||
44 | /** Returns the actual IP header length. |
44 | /** Returns the actual IP header length in bytes. |
45 | * @param header The IP packet header. Input parameter. |
45 | * @param[in] header The IP packet header. |
46 | */ |
46 | */ |
47 | #define IP_HEADER_LENGTH( header ) (( header )->header_length * 4u ) |
47 | #define IP_HEADER_LENGTH( header ) (( header )->header_length * 4u ) |
48 | 48 | ||
49 | /** Returns the actual IP header length. |
49 | /** Returns the IP header length. |
50 | * @param header The IP packet header. Input parameter. |
50 | * @param[in] length The IP header length in bytes. |
51 | */ |
51 | */ |
52 | #define IP_COMPUTE_HEADER_LENGTH( length ) (( uint8_t ) (( length ) / 4u )) |
52 | #define IP_COMPUTE_HEADER_LENGTH( length ) (( uint8_t ) (( length ) / 4u )) |
53 | 53 | ||
54 | /** Returns the actual IP packet total length. |
54 | /** Returns the actual IP packet total length. |
55 | * @param header The IP packet header. Input parameter. |
55 | * @param[in] header The IP packet header. |
56 | */ |
56 | */ |
57 | #define IP_TOTAL_LENGTH( header ) ntohs(( header )->total_length ) |
57 | #define IP_TOTAL_LENGTH( header ) ntohs(( header )->total_length ) |
58 | 58 | ||
59 | /** Returns the actual IP packet data length. |
59 | /** Returns the actual IP packet data length. |
60 | * @param header The IP packet header. Input parameter. |
60 | * @param[in] header The IP packet header. |
61 | */ |
61 | */ |
62 | #define IP_HEADER_DATA_LENGTH( header ) ( IP_TOTAL_LENGTH( header ) - IP_HEADER_LENGTH( header )) |
62 | #define IP_HEADER_DATA_LENGTH( header ) ( IP_TOTAL_LENGTH( header ) - IP_HEADER_LENGTH( header )) |
63 | 63 | ||
64 | /** Returns the IP packet header checksum. |
64 | /** Returns the IP packet header checksum. |
65 | * @param header The IP packet header. Input parameter. |
65 | * @param[in] header The IP packet header. |
66 | */ |
66 | */ |
67 | #define IP_HEADER_CHECKSUM( header ) ( htons( ip_checksum(( uint8_t * )( header ), IP_HEADER_LENGTH( header )))) |
67 | #define IP_HEADER_CHECKSUM( header ) ( htons( ip_checksum(( uint8_t * )( header ), IP_HEADER_LENGTH( header )))) |
68 | 68 | ||
69 | /** Returns the fragment offest. |
69 | /** Returns the fragment offest. |
70 | * @param header The IP packet header. Input parameter. |
70 | * @param[in] header The IP packet header. |
71 | */ |
71 | */ |
72 | #define IP_FRAGMENT_OFFSET( header ) (((( header )->fragment_offset_high << 8 ) + ( header )->fragment_offset_low ) * 8u ) |
72 | #define IP_FRAGMENT_OFFSET( header ) (((( header )->fragment_offset_high << 8 ) + ( header )->fragment_offset_low ) * 8u ) |
73 | 73 | ||
74 | /** Returns the fragment offest high bits. |
74 | /** Returns the fragment offest high bits. |
75 | * @param length The prefixed data total length. Input parameter. |
75 | * @param[in] length The prefixed data total length. |
76 | */ |
76 | */ |
77 | #define IP_COMPUTE_FRAGMENT_OFFSET_HIGH( length ) (((( length ) / 8u ) & 0x1F00 ) >> 8 ) |
77 | #define IP_COMPUTE_FRAGMENT_OFFSET_HIGH( length ) (((( length ) / 8u ) & 0x1F00 ) >> 8 ) |
78 | 78 | ||
79 | /** Returns the fragment offest low bits. |
79 | /** Returns the fragment offest low bits. |
80 | * @param length The prefixed data total length. Input parameter. |
80 | * @param[in] length The prefixed data total length. |
81 | */ |
81 | */ |
82 | #define IP_COMPUTE_FRAGMENT_OFFSET_LOW( length ) ((( length ) / 8u ) & 0xFF ) |
82 | #define IP_COMPUTE_FRAGMENT_OFFSET_LOW( length ) ((( length ) / 8u ) & 0xFF ) |
83 | 83 | ||
84 | /** Type definition of the internet header. |
84 | /** Type definition of the internet header. |
85 | * @see ip_header |
85 | * @see ip_header |
86 | */ |
86 | */ |
87 | typedef struct ip_header ip_header_t; |
87 | typedef struct ip_header ip_header_t; |
88 | 88 | ||
89 | /** Type definition of the internet header pointer. |
89 | /** Type definition of the internet header pointer. |
90 | * @see ip_header |
90 | * @see ip_header |
91 | */ |
91 | */ |
92 | typedef ip_header_t * ip_header_ref; |
92 | typedef ip_header_t * ip_header_ref; |
93 | 93 | ||
94 | /** Internet header. |
94 | /** Internet header. |
95 | * The variable options should be included after the header itself and indicated by the increased header length value. |
95 | * The variable options should be included after the header itself and indicated by the increased header length value. |
96 | */ |
96 | */ |
97 | struct ip_header{ |
97 | struct ip_header{ |
98 | #ifdef ARCH_IS_BIG_ENDIAN |
98 | #ifdef ARCH_IS_BIG_ENDIAN |
99 | /** The Version field indicates the format of the internet header. |
99 | /** The Version field indicates the format of the internet header. |
100 | */ |
100 | */ |
101 | uint8_t version:4; |
101 | uint8_t version:4; |
102 | /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data. |
102 | /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data. |
103 | * Note that the minimum value for a~correct header is~5. |
103 | * Note that the minimum value for a~correct header is~5. |
104 | */ |
104 | */ |
105 | uint8_t header_length:4; |
105 | uint8_t header_length:4; |
106 | #else |
106 | #else |
107 | /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data. |
107 | /** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data. |
108 | * Note that the minimum value for a~correct header is~5. |
108 | * Note that the minimum value for a~correct header is~5. |
109 | */ |
109 | */ |
110 | uint8_t header_length:4; |
110 | uint8_t header_length:4; |
111 | /** The Version field indicates the format of the internet header. |
111 | /** The Version field indicates the format of the internet header. |
112 | */ |
112 | */ |
113 | uint8_t version:4; |
113 | uint8_t version:4; |
114 | #endif |
114 | #endif |
115 | /** The Type of Service provides an indication of the abstract parameters of the quality of service desired. |
115 | /** The Type of Service provides an indication of the abstract parameters of the quality of service desired. |
116 | * These parameters are to be used to guide the selection of the actual service parameters when transmitting a~datagram through a~particular network. |
116 | * These parameters are to be used to guide the selection of the actual service parameters when transmitting a~datagram through a~particular network. |
117 | * Several networks offer service precedence, which somehow treats high precedence traffic as more important than other traffic (generally by accepting only traffic above a~certain precedence at time of high load). |
117 | * Several networks offer service precedence, which somehow treats high precedence traffic as more important than other traffic (generally by accepting only traffic above a~certain precedence at time of high load). |
118 | * The major choice is a~three way tradeoff between low-delay, high-reliability, and high-throughput. |
118 | * The major choice is a~three way tradeoff between low-delay, high-reliability, and high-throughput. |
119 | */ |
119 | */ |
120 | uint8_t tos; |
120 | uint8_t tos; |
121 | /** Total Length is the length of the datagram, measured in octets, including internet header and data. |
121 | /** Total Length is the length of the datagram, measured in octets, including internet header and data. |
122 | * This field allows the length of a~datagram to be up to 65,535~octets. |
122 | * This field allows the length of a~datagram to be up to 65,535~octets. |
123 | */ |
123 | */ |
124 | uint16_t total_length; |
124 | uint16_t total_length; |
125 | /** An identifying value assigned by the sender to aid in assembling the fragments of a~datagram. |
125 | /** An identifying value assigned by the sender to aid in assembling the fragments of a~datagram. |
126 | */ |
126 | */ |
127 | uint16_t identification; |
127 | uint16_t identification; |
128 | #ifdef ARCH_IS_BIG_ENDIAN |
128 | #ifdef ARCH_IS_BIG_ENDIAN |
129 | /** Various control flags. |
129 | /** Various control flags. |
130 | */ |
130 | */ |
131 | uint8_t flags:3; |
131 | uint8_t flags:3; |
132 | /** This field indicates where in the datagram this fragment belongs. |
132 | /** This field indicates where in the datagram this fragment belongs. |
133 | * High bits. |
133 | * High bits. |
134 | */ |
134 | */ |
135 | uint8_t fragment_offset_high:5; |
135 | uint8_t fragment_offset_high:5; |
136 | #else |
136 | #else |
137 | /** This field indicates where in the datagram this fragment belongs. |
137 | /** This field indicates where in the datagram this fragment belongs. |
138 | * High bits. |
138 | * High bits. |
139 | */ |
139 | */ |
140 | uint8_t fragment_offset_high:5; |
140 | uint8_t fragment_offset_high:5; |
141 | /** Various control flags. |
141 | /** Various control flags. |
142 | */ |
142 | */ |
143 | uint8_t flags:3; |
143 | uint8_t flags:3; |
144 | #endif |
144 | #endif |
145 | /** This field indicates where in the datagram this fragment belongs. |
145 | /** This field indicates where in the datagram this fragment belongs. |
146 | * Low bits. |
146 | * Low bits. |
147 | */ |
147 | */ |
148 | uint8_t fragment_offset_low; |
148 | uint8_t fragment_offset_low; |
149 | /** This field indicates the maximum time the datagram is allowed to remain in the internet system. |
149 | /** This field indicates the maximum time the datagram is allowed to remain in the internet system. |
150 | * If this field contains the value zero, then the datagram must be destroyed. |
150 | * If this field contains the value zero, then the datagram must be destroyed. |
151 | * This field is modified in internet header processing. |
151 | * This field is modified in internet header processing. |
152 | * The time is measured in units of seconds, but since every module that processes a~datagram must decrease the TTL by at least one even if it process the datagram in less than a~second, the TTL must be thought of only as an upper bound on the time a~datagram may exist. |
152 | * The time is measured in units of seconds, but since every module that processes a~datagram must decrease the TTL by at least one even if it process the datagram in less than a~second, the TTL must be thought of only as an upper bound on the time a~datagram may exist. |
153 | * The intention is to cause undeliverable datagrams to be discarded, and to bound the maximum datagram lifetime. |
153 | * The intention is to cause undeliverable datagrams to be discarded, and to bound the maximum datagram lifetime. |
154 | */ |
154 | */ |
155 | uint8_t ttl; |
155 | uint8_t ttl; |
156 | /** This field indicates the next level protocol used in the data portion of the internet datagram. |
156 | /** This field indicates the next level protocol used in the data portion of the internet datagram. |
157 | */ |
157 | */ |
158 | uint8_t protocol; |
158 | uint8_t protocol; |
159 | /** A checksum of the header only. |
159 | /** A checksum of the header only. |
160 | * Since some header fields change (e.g., time to live), this is recomputed and verified at each point that the internet header is processed. |
160 | * Since some header fields change (e.g., time to live), this is recomputed and verified at each point that the internet header is processed. |
161 | * The checksum algorithm is: The checksum field is the 16~bit one's complement of the one's complement sum of all 16~bit words in the header. |
161 | * The checksum algorithm is: The checksum field is the 16~bit one's complement of the one's complement sum of all 16~bit words in the header. |
162 | * For purposes of computing the checksum, the value of the checksum field is zero. |
162 | * For purposes of computing the checksum, the value of the checksum field is zero. |
163 | */ |
163 | */ |
164 | uint16_t header_checksum; |
164 | uint16_t header_checksum; |
165 | /** The source address. |
165 | /** The source address. |
166 | */ |
166 | */ |
167 | uint32_t source_address; |
167 | uint32_t source_address; |
168 | /** The destination address. |
168 | /** The destination address. |
169 | */ |
169 | */ |
170 | uint32_t destination_address; |
170 | uint32_t destination_address; |
171 | } __attribute__ ((packed)); |
171 | } __attribute__ ((packed)); |
172 | 172 | ||
173 | /** Type definition of the internet option header. |
173 | /** Type definition of the internet option header. |
174 | * @see ip_header |
174 | * @see ip_header |
175 | */ |
175 | */ |
176 | typedef struct ip_option ip_option_t; |
176 | typedef struct ip_option ip_option_t; |
177 | 177 | ||
178 | /** Type definition of the internet option header pointer. |
178 | /** Type definition of the internet option header pointer. |
179 | * @see ip_header |
179 | * @see ip_header |
180 | */ |
180 | */ |
181 | typedef ip_option_t * ip_option_ref; |
181 | typedef ip_option_t * ip_option_ref; |
182 | 182 | ||
183 | /** Internet option header. |
183 | /** Internet option header. |
184 | * Only type field is always valid. |
184 | * Only type field is always valid. |
185 | * Other fields' validity depends on the option type. |
185 | * Other fields' validity depends on the option type. |
186 | */ |
186 | */ |
187 | struct ip_option{ |
187 | struct ip_option{ |
188 | /** A single octet of option-type. |
188 | /** A single octet of option-type. |
189 | */ |
189 | */ |
190 | uint8_t type; |
190 | uint8_t type; |
191 | /** An option length octet. |
191 | /** An option length octet. |
192 | */ |
192 | */ |
193 | uint8_t length; |
193 | uint8_t length; |
194 | /** A~pointer. |
194 | /** A~pointer. |
195 | */ |
195 | */ |
196 | uint8_t pointer; |
196 | uint8_t pointer; |
197 | #ifdef ARCH_IS_BIG_ENDIAN |
197 | #ifdef ARCH_IS_BIG_ENDIAN |
198 | /** The number of IP modules that cannot register timestamps due to lack of space. |
198 | /** The number of IP modules that cannot register timestamps due to lack of space. |
199 | */ |
199 | */ |
200 | uint8_t overflow:4; |
200 | uint8_t overflow:4; |
201 | /** Various internet timestamp control flags. |
201 | /** Various internet timestamp control flags. |
202 | */ |
202 | */ |
203 | uint8_t flags:4; |
203 | uint8_t flags:4; |
204 | #else |
204 | #else |
205 | /** Various internet timestamp control flags. |
205 | /** Various internet timestamp control flags. |
206 | */ |
206 | */ |
207 | uint8_t flags:4; |
207 | uint8_t flags:4; |
208 | /** The number of IP modules that cannot register timestamps due to lack of space. |
208 | /** The number of IP modules that cannot register timestamps due to lack of space. |
209 | */ |
209 | */ |
210 | uint8_t overflow:4; |
210 | uint8_t overflow:4; |
211 | #endif |
211 | #endif |
212 | } __attribute__ ((packed)); |
212 | } __attribute__ ((packed)); |
213 | 213 | ||
214 | /** @name IP flags definitions |
214 | /** @name IP flags definitions |
215 | */ |
215 | */ |
216 | /*@{*/ |
216 | /*@{*/ |
217 | 217 | ||
218 | /** Fragment flag field shift. |
218 | /** Fragment flag field shift. |
219 | */ |
219 | */ |
220 | #define IPFLAG_FRAGMENT_SHIFT 1 |
220 | #define IPFLAG_FRAGMENT_SHIFT 1 |
221 | 221 | ||
222 | /** Fragmented flag field shift. |
222 | /** Fragmented flag field shift. |
223 | */ |
223 | */ |
224 | #define IPFLAG_FRAGMENTED_SHIFT 0 |
224 | #define IPFLAG_FRAGMENTED_SHIFT 0 |
225 | 225 | ||
226 | /** May fragment flag value. |
226 | /** May fragment flag value. |
227 | * Allows the packet fragmentation. |
227 | * Allows the packet fragmentation. |
228 | */ |
228 | */ |
229 | #define IPFLAG_MAY_FRAGMENT ( 0x0 << IPFLAG_FRAGMENT_SHIFT ) |
229 | #define IPFLAG_MAY_FRAGMENT ( 0x0 << IPFLAG_FRAGMENT_SHIFT ) |
230 | 230 | ||
231 | /** Don't fragment flag value. |
231 | /** Don't fragment flag value. |
232 | * Permits the packet fragmentation. |
232 | * Permits the packet fragmentation. |
233 | */ |
233 | */ |
234 | #define IPFLAG_DONT_FRAGMENT ( 0x1 << IPFLAG_FRAGMENT_SHIFT ) |
234 | #define IPFLAG_DONT_FRAGMENT ( 0x1 << IPFLAG_FRAGMENT_SHIFT ) |
235 | 235 | ||
236 | /** Last fragment flag value. |
236 | /** Last fragment flag value. |
237 | * Indicates the last packet fragment. |
237 | * Indicates the last packet fragment. |
238 | */ |
238 | */ |
239 | #define IPFLAG_LAST_FRAGMENT ( 0x0 << IPFLAG_FRAGMENTED_SHIFT ) |
239 | #define IPFLAG_LAST_FRAGMENT ( 0x0 << IPFLAG_FRAGMENTED_SHIFT ) |
240 | 240 | ||
241 | /** More fragments flag value. |
241 | /** More fragments flag value. |
242 | * Indicates that more packet fragments follow. |
242 | * Indicates that more packet fragments follow. |
243 | */ |
243 | */ |
244 | #define IPFLAG_MORE_FRAGMENTS ( 0x1 << IPFLAG_FRAGMENTED_SHIFT ) |
244 | #define IPFLAG_MORE_FRAGMENTS ( 0x1 << IPFLAG_FRAGMENTED_SHIFT ) |
245 | 245 | ||
246 | /*@}*/ |
246 | /*@}*/ |
247 | 247 | ||
248 | /** Type definition of the internet version 4 pseudo header. |
248 | /** Type definition of the internet version 4 pseudo header. |
249 | * @see ipv4_pseudo_header |
249 | * @see ipv4_pseudo_header |
250 | */ |
250 | */ |
251 | typedef struct ipv4_pseudo_header ipv4_pseudo_header_t; |
251 | typedef struct ipv4_pseudo_header ipv4_pseudo_header_t; |
252 | 252 | ||
253 | /** Type definition of the internet version 4 pseudo header pointer. |
253 | /** Type definition of the internet version 4 pseudo header pointer. |
254 | * @see ipv4_pseudo_header |
254 | * @see ipv4_pseudo_header |
255 | */ |
255 | */ |
256 | typedef ipv4_pseudo_header_t * ipv4_pseudo_header_ref; |
256 | typedef ipv4_pseudo_header_t * ipv4_pseudo_header_ref; |
257 | 257 | ||
258 | /** Internet version 4 pseudo header. |
258 | /** Internet version 4 pseudo header. |
259 | */ |
259 | */ |
260 | struct ipv4_pseudo_header{ |
260 | struct ipv4_pseudo_header{ |
261 | /** The source address. |
261 | /** The source address. |
262 | */ |
262 | */ |
263 | uint32_t source_address; |
263 | uint32_t source_address; |
264 | /** The destination address. |
264 | /** The destination address. |
265 | */ |
265 | */ |
266 | uint32_t destination_address; |
266 | uint32_t destination_address; |
267 | /** Reserved byte. |
267 | /** Reserved byte. |
268 | * Must be zero. |
268 | * Must be zero. |
269 | */ |
269 | */ |
270 | uint8_t reserved; |
270 | uint8_t reserved; |
271 | /** This field indicates the next level protocol used in the data portion of the internet datagram. |
271 | /** This field indicates the next level protocol used in the data portion of the internet datagram. |
272 | */ |
272 | */ |
273 | uint8_t protocol; |
273 | uint8_t protocol; |
274 | /** Data length is the length of the datagram, measured in octets. |
274 | /** Data length is the length of the datagram, measured in octets. |
275 | */ |
275 | */ |
276 | uint16_t data_length; |
276 | uint16_t data_length; |
277 | } __attribute__ ((packed)); |
277 | } __attribute__ ((packed)); |
278 | 278 | ||
279 | #endif |
279 | #endif |
280 | 280 | ||
281 | /** @} |
281 | /** @} |
282 | */ |
282 | */ |
283 | 283 |