Squashed 'lib/lufa/' content from commit 385d40300

git-subtree-dir: lib/lufa
git-subtree-split: 385d4030035dbaf41591309dbde47653bd03841b

1 files changed, 113 insertions, 0 deletions

diff --git a/Demos/Device/LowLevel/RNDISEthernet/Lib/IP.c b/Demos/Device/LowLevel/RNDISEthernet/Lib/IP.c
new file mode 100644
index 000000000..dfa583b85
--- /dev/null
+++ b/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;
+}
+