Rev 4704 | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
| Rev 4704 | Rev 4728 | ||
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| 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 | ||
| Line 54... | Line 54... | ||
| 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 | /** @} |