Rev 4704 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4579 | mejdrech | 1 | /* |
| 2 | * Copyright (c) 2009 Lukas Mejdrech |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 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 |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 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 |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 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 |
||
| 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 |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | /** @addtogroup udp |
||
| 30 | * @{ |
||
| 31 | */ |
||
| 32 | |||
| 33 | /** @file |
||
| 4704 | mejdrech | 34 | * UDP header definition. |
| 4728 | mejdrech | 35 | * Based on the RFC~768. |
| 4579 | mejdrech | 36 | */ |
| 37 | |||
| 38 | #ifndef __NET_UDP_HEADER_H__ |
||
| 39 | #define __NET_UDP_HEADER_H__ |
||
| 40 | |||
| 41 | #include <sys/types.h> |
||
| 42 | |||
| 43 | /** Type definition of the user datagram header. |
||
| 44 | * @see udp_header |
||
| 45 | */ |
||
| 46 | typedef struct udp_header udp_header_t; |
||
| 47 | |||
| 48 | /** Type definition of the user datagram header pointer. |
||
| 49 | * @see udp_header |
||
| 50 | */ |
||
| 51 | typedef udp_header_t * udp_header_ref; |
||
| 52 | |||
| 53 | /** User datagram header. |
||
| 54 | */ |
||
| 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. |
||
| 57 | * If not used, a value of zero is inserted. |
||
| 58 | */ |
||
| 4728 | mejdrech | 59 | uint16_t source_port; |
| 4579 | mejdrech | 60 | /** Destination port has a meaning within the context of a particular internet destination address. |
| 61 | */ |
||
| 4728 | mejdrech | 62 | uint16_t destination_port; |
| 4579 | mejdrech | 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. |
||
| 65 | */ |
||
| 4728 | mejdrech | 66 | uint16_t total_length; |
| 4579 | mejdrech | 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. |
||
| 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). |
||
| 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 | */ |
||
| 4728 | mejdrech | 73 | uint16_t checksum; |
| 4579 | mejdrech | 74 | } __attribute__ ((packed)); |
| 75 | |||
| 76 | #endif |
||
| 77 | |||
| 78 | /** @} |
||
| 79 | */ |