1 files changed, 113 insertions, 0 deletions

diff --git a/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/IP.c b/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/IP.c
new file mode 100644
index 000000000..dfa583b85
--- /dev/null
+++ b/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/IP.c
@@ -0,0 +1,113 @@
+/*
+             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 Protocol (IP) packet handling routines. This protocol handles IP packets from the
+ *  host which typically encapsulate other protocols such as ICMP, UDP and TCP.
+ */
+
+#include "IP.h"
+
+/** Processes an IP packet inside an Ethernet frame, and writes the appropriate response
+ *  to the output Ethernet frame if one is created by a sub-protocol handler.
+ *
+ *  \param[in] InDataStart    Pointer to the start of the incoming packet's IP header
+ *  \param[out] OutDataStart  Pointer to the start of the outgoing packet's IP header
+ *
+ *  \return The number of bytes written to the out Ethernet frame if any, NO_RESPONSE if no
+ *           response was generated, NO_PROCESS if the packet processing was deferred until the
+ *           next Ethernet packet handler iteration
+ */
+int16_t IP_ProcessIPPacket(void* InDataStart,
+                           void* OutDataStart)
+{
+        DecodeIPHeader(InDataStart);
+
+        IP_Header_t* IPHeaderIN  = (IP_Header_t*)InDataStart;
+        IP_Header_t* IPHeaderOUT = (IP_Header_t*)OutDataStart;
+
+        /* Header length is specified in number of longs in the packet header, convert to bytes */
+        uint16_t HeaderLengthBytes = (IPHeaderIN->HeaderLength * sizeof(uint32_t));
+
+        int16_t  RetSize = NO_RESPONSE;
+
+        /* Check to ensure the IP packet is addressed to the virtual webserver's IP or the broadcast IP address */
+        if (!(IP_COMPARE(&IPHeaderIN->DestinationAddress, &ServerIPAddress)) &&
+            !(IP_COMPARE(&IPHeaderIN->DestinationAddress, &BroadcastIPAddress)))
+        {
+                return NO_RESPONSE;
+        }
+
+        /* Pass off the IP payload to the appropriate protocol processing routine */
+        switch (IPHeaderIN->Protocol)
+        {
+                case PROTOCOL_ICMP:
+                        RetSize = ICMP_ProcessICMPPacket(&((uint8_t*)InDataStart)[HeaderLengthBytes],
+                                                         &((uint8_t*)OutDataStart)[sizeof(IP_Header_t)]);
+                        break;
+                case PROTOCOL_TCP:
+                        RetSize = TCP_ProcessTCPPacket(InDataStart,
+                                                       &((uint8_t*)InDataStart)[HeaderLengthBytes],
+                                                       &((uint8_t*)OutDataStart)[sizeof(IP_Header_t)]);
+                        break;
+                case PROTOCOL_UDP:
+                        RetSize = UDP_ProcessUDPPacket(InDataStart,
+                                                       &((uint8_t*)InDataStart)[HeaderLengthBytes],
+                                                       &((uint8_t*)OutDataStart)[sizeof(IP_Header_t)]);
+                        break;
+        }
+
+        /* Check to see if the protocol processing routine has filled out a response */
+        if (RetSize > 0)
+        {
+                /* Fill out the response IP packet header */
+                IPHeaderOUT->TotalLength        = SwapEndian_16(sizeof(IP_Header_t) + RetSize);
+                IPHeaderOUT->TypeOfService      = 0;
+                IPHeaderOUT->HeaderLength       = (sizeof(IP_Header_t) / sizeof(uint32_t));
+                IPHeaderOUT->Version            = 4;
+                IPHeaderOUT->Flags              = 0;
+                IPHeaderOUT->FragmentOffset     = 0;
+                IPHeaderOUT->Identification     = 0;
+                IPHeaderOUT->HeaderChecksum     = 0;
+                IPHeaderOUT->Protocol           = IPHeaderIN->Protocol;
+                IPHeaderOUT->TTL                = DEFAULT_TTL;
+                IPHeaderOUT->SourceAddress      = IPHeaderIN->DestinationAddress;
+                IPHeaderOUT->DestinationAddress = IPHeaderIN->SourceAddress;
+
+                IPHeaderOUT->HeaderChecksum     = Ethernet_Checksum16(IPHeaderOUT, sizeof(IP_Header_t));
+
+                /* Return the size of the response so far */
+                return (sizeof(IP_Header_t) + RetSize);
+        }
+
+        return RetSize;
+}
+