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This is a low-level network debugging utility that utilizes raw packet i/o to construct and deconstruct tcp, udp, ipv4, arp, and icmp packets over ethernet.
Diff: net/arp.h
- Revision:
- 0:d494b853ce97
- Child:
- 1:63d4ff534d65
diff -r 000000000000 -r d494b853ce97 net/arp.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/net/arp.h Tue Oct 12 05:32:59 2010 +0000 @@ -0,0 +1,46 @@ +#ifndef ARP_H +#define ARP_H + +#include "net.h" + +#define ETHERTYPE_ARP 0x0806 +typedef struct { + u16 hardware_type; // 0x0001 for ethernet + u16 protocol_type; // 0x0800 for IPv4 + u8 hardware_length; // Bytes. Ethernet is 6 + u8 protocol_length; // Bytes. IPv4 is 4 + u16 operation; // Operation. 1 for request, 2 for reply or announce + // The following are only valid for IPv4 over Ethernet + u8 sender_hardware_address[6]; // Generator of the request or reply + u8 sender_protocol_address[4]; // All zeroes for an ARP probe + u8 target_hardware_address[6]; // Announce - same as SHA + u8 target_protocol_address[4]; // Announce - Same as TPA +} ARP_Packet; + +inline void fix_endian_arp(ARP_Packet *packet) +{ + fix_endian_u16(&packet->hardware_type); + fix_endian_u16(&packet->protocol_type); + fix_endian_u16(&packet->operation); +} + +inline void print_arp(ARP_Packet *packet) +{ + main_log.printf("ARP Packet:"); + main_log.printf(" Hardware: 0x%04X", packet->hardware_type); + main_log.printf(" Protocol: 0x%04X", packet->protocol_type); + main_log.printf(" Type: %d", packet->operation); + if (packet->hardware_type != 0x0001 || packet->protocol_type != 0x0800) return; + + u8 *bytes; + bytes = packet->sender_hardware_address; + main_log.printf(" Source: MAC - %02X:%02X:%02X:%02X:%02X:%02X", bytes[0],bytes[1],bytes[2],bytes[3],bytes[4],bytes[5]); + bytes = packet->target_hardware_address; + main_log.printf(" Target: MAC - %02X:%02X:%02X:%02X:%02X:%02X", bytes[0],bytes[1],bytes[2],bytes[3],bytes[4],bytes[5]); + bytes = packet->sender_protocol_address; + main_log.printf(" Source: IP - %03d.%03d.%03d.%03d", bytes[0], bytes[1], bytes[2], bytes[3]); + bytes = packet->target_protocol_address; + main_log.printf(" Target: IP - %03d.%03d.%03d.%03d", bytes[0], bytes[1], bytes[2], bytes[3]); +} + +#endif \ No newline at end of file