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Diffstat (limited to 'Demos/RNDISEthernet/ICMP.c')
-rw-r--r-- | Demos/RNDISEthernet/ICMP.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Demos/RNDISEthernet/ICMP.c b/Demos/RNDISEthernet/ICMP.c new file mode 100644 index 000000000..a15564059 --- /dev/null +++ b/Demos/RNDISEthernet/ICMP.c @@ -0,0 +1,79 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, and distribute this software
+ and its documentation for any purpose and without fee is hereby
+ granted, provided that the above copyright notice appear in all
+ copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * Internet Control Message Protocol (ICMP) packet handling routines. This protocol handles
+ * Echo requests from the host, to indicate a successful network connection between the host
+ * and the virtual server.
+ */
+
+#include "ICMP.h"
+
+/** Processes an ICMP packet inside an Ethernet frame, and writes the appropriate response
+ * to the output Ethernet frame if the host is issuing a ICMP ECHO request.
+ *
+ * \param InDataStart Pointer to the start of the incomming packet's ICMP header
+ * \param OutDataStart Pointer to the start of the outgoing packet's ICMP header
+ *
+ * \return The number of bytes written to the out Ethernet frame if any, NO_RESPONSE otherwise
+ */
+int16_t ICMP_ProcessICMPPacket(void* InDataStart, void* OutDataStart)
+{
+ ICMP_Header_t* ICMPHeaderIN = (ICMP_Header_t*)InDataStart;
+ ICMP_Header_t* ICMPHeaderOUT = (ICMP_Header_t*)OutDataStart;
+
+ DecodeICMPHeader(InDataStart);
+
+ /* Determine if the ICMP packet is an echo request (ping) */
+ if (ICMPHeaderIN->Type == ICMP_TYPE_ECHOREQUEST)
+ {
+ /* Fill out the ICMP response packet */
+ ICMPHeaderOUT->Type = ICMP_TYPE_ECHOREPLY;
+ ICMPHeaderOUT->Code = 0;
+ ICMPHeaderOUT->Checksum = 0;
+ ICMPHeaderOUT->Id = ICMPHeaderIN->Id;
+ ICMPHeaderOUT->Sequence = ICMPHeaderIN->Sequence;
+
+ uint16_t DataSize = FrameIN.FrameLength - ((((uint16_t)InDataStart + sizeof(ICMP_Header_t)) - (uint16_t)FrameIN.FrameData));
+
+ /* Copy the remaining payload to the response - echo requests should echo back any sent data */
+ memcpy(&((uint8_t*)OutDataStart)[sizeof(ICMP_Header_t)],
+ &((uint8_t*)InDataStart)[sizeof(ICMP_Header_t)],
+ DataSize);
+
+ ICMPHeaderOUT->Checksum = Ethernet_Checksum16(ICMPHeaderOUT, (DataSize + sizeof(ICMP_Header_t)));
+
+ /* Return the size of the response so far */
+ return (DataSize + sizeof(ICMP_Header_t));
+ }
+
+ return NO_RESPONSE;
+}
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