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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 udp |
29 | /** @addtogroup udp |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** @file |
33 | /** @file |
34 | * UDP header definition. |
34 | * UDP header definition. |
35 | * Names according to the linux src/include/linux/udp.h header file. |
35 | * Based on the RFC~768. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #ifndef __NET_UDP_HEADER_H__ |
38 | #ifndef __NET_UDP_HEADER_H__ |
39 | #define __NET_UDP_HEADER_H__ |
39 | #define __NET_UDP_HEADER_H__ |
40 | 40 | ||
41 | #include <sys/types.h> |
41 | #include <sys/types.h> |
42 | 42 | ||
43 | /** Type definition of the user datagram header. |
43 | /** Type definition of the user datagram header. |
44 | * @see udp_header |
44 | * @see udp_header |
45 | */ |
45 | */ |
46 | typedef struct udp_header udp_header_t; |
46 | typedef struct udp_header udp_header_t; |
47 | 47 | ||
48 | /** Type definition of the user datagram header pointer. |
48 | /** Type definition of the user datagram header pointer. |
49 | * @see udp_header |
49 | * @see udp_header |
50 | */ |
50 | */ |
51 | typedef udp_header_t * udp_header_ref; |
51 | typedef udp_header_t * udp_header_ref; |
52 | 52 | ||
53 | /** User datagram header. |
53 | /** User datagram header. |
54 | */ |
54 | */ |
55 | struct udp_header{ |
55 | struct udp_header{ |
56 | /** Source Port is an optional field, when meaningful, it indicates the port of the sending process, and may be assumed to be the port to which a reply should be addressed in the absence of any other information. |
56 | /** Source Port is an optional field, when meaningful, it indicates the port of the sending process, and may be assumed to be the port to which a reply should be addressed in the absence of any other information. |
57 | * If not used, a value of zero is inserted. |
57 | * If not used, a value of zero is inserted. |
58 | */ |
58 | */ |
59 | uint16_t source; |
59 | uint16_t source_port; |
60 | /** Destination port has a meaning within the context of a particular internet destination address. |
60 | /** Destination port has a meaning within the context of a particular internet destination address. |
61 | */ |
61 | */ |
62 | uint16_t dest; |
62 | uint16_t destination_port; |
63 | /** Length is the length in octets of this user datagram including this header and the data. |
63 | /** Length is the length in octets of this user datagram including this header and the data. |
64 | * This means the minimum value of the length is eight. |
64 | * This means the minimum value of the length is eight. |
65 | */ |
65 | */ |
66 | uint16_t len; |
66 | uint16_t total_length; |
67 | /** Checksum is the 16-bit one's complement of the one's complement sum of a pseudo header of information from the IP header, the UDP header, and the data, padded with zero octets at the end (if necessary) to make a multiple of two octets. |
67 | /** Checksum is the 16-bit one's complement of the one's complement sum of a pseudo header of information from the IP header, the UDP header, and the data, padded with zero octets at the end (if necessary) to make a multiple of two octets. |
68 | * The pseudo header conceptually prefixed to the UDP header contains the source address, the destination address, the protocol, and the UDP length. |
68 | * The pseudo header conceptually prefixed to the UDP header contains the source address, the destination address, the protocol, and the UDP length. |
69 | * This information gives protection against misrouted datagrams. |
69 | * This information gives protection against misrouted datagrams. |
70 | * If the computed checksum is zero, it is transmitted as all ones (the equivalent in one's complement arithmetic). |
70 | * If the computed checksum is zero, it is transmitted as all ones (the equivalent in one's complement arithmetic). |
71 | * An all zero transmitted checksum value means that the transmitter generated no checksum (for debugging or for higher level protocols that don't care). |
71 | * An all zero transmitted checksum value means that the transmitter generated no checksum (for debugging or for higher level protocols that don't care). |
72 | */ |
72 | */ |
73 | uint16_t check; |
73 | uint16_t checksum; |
74 | } __attribute__ ((packed)); |
74 | } __attribute__ ((packed)); |
75 | 75 | ||
76 | #endif |
76 | #endif |
77 | 77 | ||
78 | /** @} |
78 | /** @} |
79 | */ |
79 | */ |
80 | 80 |