Diff: net/arp.h

Revision:

1:feaa107f56b3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/net/arp.h	Fri Apr 24 03:11:02 2015 +0000
@@ -0,0 +1,58 @@
+#ifndef ARP_H
+#define ARP_H
+
+#include "net.h"
+
+/**
+  \file
+  \brief ARP packet
+  
+  This file contains the memory map and associated functions for ARP packet
+  creation and deconstruction. 
+*/
+
+#define ETHERTYPE_ARP 0x0806
+
+/// ARP Packet memory map
+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;
+
+/// Convert from wire to host or host to wire endianness
+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);
+}
+
+/// Print the ARP packet
+inline void print_arp(ARP_Packet *packet)
+{
+    printf("ARP Packet: \n");
+    printf("  Hardware:  0x%04X \n", packet->hardware_type);
+    printf("  Protocol:  0x%04X \n", packet->protocol_type);
+    printf("  Type:      %d \n", packet->operation);
+    if (packet->hardware_type != 0x0001 || packet->protocol_type != 0x0800) return;
+    
+    u8 *bytes;
+    bytes = packet->sender_hardware_address;
+    printf("  Source:    MAC - %02X:%02X:%02X:%02X:%02X:%02X \n", bytes[0],bytes[1],bytes[2],bytes[3],bytes[4],bytes[5]);
+    bytes = packet->target_hardware_address;
+    printf("  Target:    MAC - %02X:%02X:%02X:%02X:%02X:%02X \n", bytes[0],bytes[1],bytes[2],bytes[3],bytes[4],bytes[5]);
+    bytes = packet->sender_protocol_address;
+    printf("  Source:    IP  - %03d.%03d.%03d.%03d \n", bytes[0], bytes[1], bytes[2], bytes[3]);
+    bytes = packet->target_protocol_address;
+    printf("  Target:    IP  - %03d.%03d.%03d.%03d \n", bytes[0], bytes[1], bytes[2], bytes[3]);
+}
+
+#endif
\ No newline at end of file