Merge commit '60b30c036397cb5627fa374bb930794b225daa29' as 'lib/lufa'

[qmk_firmware.git] / lib / lufa / Demos / Device / ClassDriver / RNDISEthernet / Lib / ICMP.c

diff --git a/lib/lufa/Demos/Device/ClassDriver/RNDISEthernet/Lib/ICMP.c b/lib/lufa/Demos/Device/ClassDriver/RNDISEthernet/Lib/ICMP.c
new file mode 100644 (file)
index 0000000..24bc4b5
--- /dev/null
+++ b/lib/lufa/Demos/Device/ClassDriver/RNDISEthernet/Lib/ICMP.c
@@ -0,0 +1,83 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, 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 disclaims 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[in] FrameIN        Pointer to the incoming Ethernet frame information structure
+ *  \param[in] InDataStart    Pointer to the start of the incoming packet's ICMP header
+ *  \param[out] 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(Ethernet_Frame_Info_t* const FrameIN,
+                               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;
+
+               intptr_t DataSize = FrameIN->FrameLength - ((((intptr_t)InDataStart + sizeof(ICMP_Header_t)) - (intptr_t)FrameIN->FrameData));
+
+               /* Copy the remaining payload to the response - echo requests should echo back any sent data */
+               memmove(&((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;
+}
+