udp.h

00001 #ifndef UDP_H
00002 #define UDP_H
00003 
00004 #include "net.h"
00005 
00006 /**
00007   \file udp.h
00008   \brief UDP packet
00009   
00010   This file contains the memory map and associated functions for UDP packet
00011   creation and deconstruction. 
00012 */
00013 
00014 #define IPPROTO_UDP 0x11
00015 
00016 /// UDP Packet memory map
00017 typedef struct {
00018   u16 source_port;       ///< Source port (1-65535)
00019   u16 destination_port;  ///< Destination port (1-65535) 
00020   u16 length;            ///< Entire datagram size in bytes
00021   u16 checksum;          ///< Checksum
00022   u8 data[];             ///< Data memory map
00023 } UDP_Packet;
00024 
00025 /// Convert from wire to host or host to wire endianness
00026 inline void fix_endian_udp(UDP_Packet *segment)
00027 {
00028   fix_endian_u16(&segment->source_port);
00029   fix_endian_u16(&segment->destination_port);
00030   fix_endian_u16(&segment->length);
00031 }
00032 
00033 /// Print the UDP packet
00034 inline void print_udp(UDP_Packet *segment)
00035 {
00036   printf("UDP Packet: \n");
00037   printf("  Source:    PORT %d \n", segment->source_port);
00038   printf("  Dest:      PORT %d \n", segment->destination_port);
00039   printf("  Length:    %d \n", segment->length);
00040 }
00041 
00042 #endif