From 60b30c036397cb5627fa374bb930794b225daa29 Mon Sep 17 00:00:00 2001
From: Jack Humbert <jack.humb@gmail.com>
Date: Fri, 7 Jul 2017 11:55:23 -0400
Subject: Squashed 'lib/lufa/' content from commit 385d40300
git-subtree-dir: lib/lufa
git-subtree-split: 385d4030035dbaf41591309dbde47653bd03841b
---
.../ClassDriver/RNDISEthernet/Lib/Ethernet.c | 132 +++++++++++++++++++++
1 file changed, 132 insertions(+)
create mode 100644 Demos/Device/ClassDriver/RNDISEthernet/Lib/Ethernet.c
(limited to 'Demos/Device/ClassDriver/RNDISEthernet/Lib/Ethernet.c')
diff --git a/Demos/Device/ClassDriver/RNDISEthernet/Lib/Ethernet.c b/Demos/Device/ClassDriver/RNDISEthernet/Lib/Ethernet.c
new file mode 100644
index 0000000000..c28fa2336b
--- /dev/null
+++ b/Demos/Device/ClassDriver/RNDISEthernet/Lib/Ethernet.c
@@ -0,0 +1,132 @@
+/*
+ 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
+ *
+ * Ethernet frame packet handling routines. This protocol handles the processing of raw Ethernet
+ * frames sent and received, deferring the processing of sub-packet protocols to the appropriate
+ * protocol handlers, such as DHCP or ARP.
+ */
+
+#include "Ethernet.h"
+
+/** Constant for convenience when checking against or setting a MAC address to the virtual server MAC address. */
+const MAC_Address_t ServerMACAddress = {SERVER_MAC_ADDRESS};
+
+/** Constant for convenience when checking against or setting an IP address to the virtual server IP address. */
+const IP_Address_t ServerIPAddress = {SERVER_IP_ADDRESS};
+
+/** Constant for convenience when checking against or setting a MAC address to the broadcast MAC address. */
+const MAC_Address_t BroadcastMACAddress = {BROADCAST_MAC_ADDRESS};
+
+/** Constant for convenience when checking against or setting a IP address to the broadcast IP address. */
+const IP_Address_t BroadcastIPAddress = {BROADCAST_IP_ADDRESS};
+
+/** Constant for convenience when checking against or setting an IP address to the client (host) IP address. */
+const IP_Address_t ClientIPAddress = {CLIENT_IP_ADDRESS};
+
+
+/** Processes an incoming Ethernet frame, and writes the appropriate response to the output Ethernet
+ * frame buffer if the sub protocol handlers create a valid response.
+ */
+void Ethernet_ProcessPacket(Ethernet_Frame_Info_t* const FrameIN,
+ Ethernet_Frame_Info_t* const FrameOUT)
+{
+ DecodeEthernetFrameHeader(FrameIN->FrameData);
+
+ /* Cast the incoming Ethernet frame to the Ethernet header type */
+ Ethernet_Frame_Header_t* FrameINHeader = (Ethernet_Frame_Header_t*)&FrameIN->FrameData;
+ Ethernet_Frame_Header_t* FrameOUTHeader = (Ethernet_Frame_Header_t*)&FrameOUT->FrameData;
+
+ int16_t RetSize = NO_RESPONSE;
+
+ /* Ensure frame is addressed to either all (broadcast) or the virtual webserver, and is a type II frame */
+ if ((MAC_COMPARE(&FrameINHeader->Destination, &ServerMACAddress) ||
+ MAC_COMPARE(&FrameINHeader->Destination, &BroadcastMACAddress)) &&
+ (SwapEndian_16(FrameIN->FrameLength) > ETHERNET_VER2_MINSIZE))
+ {
+ /* Process the packet depending on its protocol */
+ switch (SwapEndian_16(FrameINHeader->EtherType))
+ {
+ case ETHERTYPE_ARP:
+ RetSize = ARP_ProcessARPPacket(&FrameIN->FrameData[sizeof(Ethernet_Frame_Header_t)],
+ &FrameOUT->FrameData[sizeof(Ethernet_Frame_Header_t)]);
+ break;
+ case ETHERTYPE_IPV4:
+ RetSize = IP_ProcessIPPacket(FrameIN,
+ &FrameIN->FrameData[sizeof(Ethernet_Frame_Header_t)],
+ &FrameOUT->FrameData[sizeof(Ethernet_Frame_Header_t)]);
+ break;
+ }
+
+ /* Protocol processing routine has filled a response, complete the ethernet frame header */
+ if (RetSize > 0)
+ {
+ /* Fill out the response Ethernet frame header */
+ FrameOUTHeader->Source = ServerMACAddress;
+ FrameOUTHeader->Destination = FrameINHeader->Source;
+ FrameOUTHeader->EtherType = FrameINHeader->EtherType;
+
+ /* Set the response length in the buffer and indicate that a response is ready to be sent */
+ FrameOUT->FrameLength = (sizeof(Ethernet_Frame_Header_t) + RetSize);
+ }
+ }
+
+ /* Check if the packet was processed */
+ if (RetSize != NO_PROCESS)
+ {
+ /* Clear the frame buffer */
+ FrameIN->FrameLength = 0;
+ }
+}
+
+/** Calculates the appropriate ethernet checksum, consisting of the addition of the one's
+ * compliment of each word, complimented.
+ *
+ * \param[in] Data Pointer to the packet buffer data whose checksum must be calculated
+ * \param[in] Bytes Number of bytes in the data buffer to process
+ *
+ * \return A 16-bit Ethernet checksum value
+ */
+uint16_t Ethernet_Checksum16(void* Data,
+ uint16_t Bytes)
+{
+ uint16_t* Words = (uint16_t*)Data;
+ uint32_t Checksum = 0;
+
+ for (uint16_t CurrWord = 0; CurrWord < (Bytes >> 1); CurrWord++)
+ Checksum += Words[CurrWord];
+
+ while (Checksum & 0xFFFF0000)
+ Checksum = ((Checksum & 0xFFFF) + (Checksum >> 16));
+
+ return ~Checksum;
+}
+
--
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