Diff: net/icmp.h

Revision:

1:feaa107f56b3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/net/icmp.h	Fri Apr 24 03:11:02 2015 +0000
@@ -0,0 +1,47 @@
+#ifndef ICMP_H
+#define ICMP_H
+
+#include "net.h"
+
+/**
+  \file icmp.h
+  \brief ICMP frame header
+  
+  This file contains the memory map and associated functions for ICMP packet
+  creation and deconstruction. 
+*/
+
+#define ICMP_ECHO_REPLY   0x00
+#define ICMP_ECHO_REQUEST 0x08
+#define IPPROTO_ICMP      0x01
+
+/// ICMP packet memory map
+typedef struct {
+    u8 type;        ///< type of ICMP message
+    u8 code;        ///< code number associated with certain message types
+    u16 checksum; 
+    u16 id;         ///< ID value, returned in ECHO REPLY
+    u16 sequence;   ///< Sequence value to be returned with ECHO REPLY
+    u8 data[];      ///< Data memory map
+} ICMP_Packet;
+
+/// Convert from wire to host or host to wire endianness
+inline void fix_endian_icmp(ICMP_Packet *segment)
+{
+  fix_endian_u16(&segment->checksum);
+  fix_endian_u16(&segment->id);
+  fix_endian_u16(&segment->sequence);
+}
+
+/// Print the ICMP packet
+inline void print_icmp(ICMP_Packet *segment)
+{
+  printf("ICMP Packet:");
+  printf("  Type:      0x%02X \n", segment->type);
+  printf("  Code:      0x%02X \n", segment->code);
+  printf("  Checksum:  0x%04X \n", segment->checksum);
+  printf("  ID:        0x%04X \n", segment->id);
+  printf("  Sequence:  0x%04X \n", segment->sequence);
+}
+
+#endif
\ No newline at end of file