ethernet.h

00001 #ifndef ETHERNET_H
00002 #define ETHERNET_H
00003 
00004 #include "net.h"
00005 
00006 /**
00007   \file ethernet.h
00008   \brief Ethernet frame header
00009   
00010   This file contains the memory map and associated functions for Ethernet frame header
00011   creation and deconstruction. 
00012 */
00013 
00014 /// Ethernet MAC address memory map
00015 typedef struct {
00016   unsigned char octet[6]; ///< Individual octsts of the MAC address
00017 } Ethernet_MAC;
00018 
00019 /// Ethernet II Frame Header Memory map
00020 typedef struct {
00021   /// Destination MAC address (6 octets)
00022   Ethernet_MAC destination;
00023   /// Source MAC address (6 octets)
00024   Ethernet_MAC source;
00025   // (optional) VLAN Tag (unsupported)
00026   /// Ethernet type or length (only <0x600 or 0x0800 IPv4 supported)
00027   u16 ethertype;
00028   /// Payload (used for memory mapping; has zero size)
00029   unsigned char payload[];
00030 } Ethernet_FrameHeader;
00031 
00032 /// Convert from wire to host or host to wire endian-ness
00033 inline void fix_endian_ethernet(Ethernet_FrameHeader *header)
00034 {
00035   fix_endian_u16(&header->ethertype);
00036 }
00037 
00038 /// Print out an ethernet packet
00039 inline void print_ethernet(Ethernet_FrameHeader *frame)
00040 {
00041   main_log.printf("Ethernet frame:");
00042   u8 *src = frame->source.octet;
00043   u8 *dst = frame->destination.octet;
00044   main_log.printf("  Source:    MAC - %02X:%02X:%02X:%02X:%02X:%02X", src[6], src[7], src[8], src[9], src[10], src[11]);
00045   main_log.printf("  Dest:      MAC - %02X:%02X:%02X:%02X:%02X:%02X", dst[0], dst[1], dst[2], dst[3], dst[4], dst[5]);
00046   main_log.printf("  Ethertype: 0x%04X", frame->ethertype);
00047 }
00048 
00049 #endif