+++ /dev/null
-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2009.\r
- \r
- dean [at] fourwalledcubicle [dot] com\r
- www.fourwalledcubicle.com\r
-*/\r
-\r
-/*\r
- Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
- Permission to use, copy, modify, and distribute this software\r
- and its documentation for any purpose and without fee is hereby\r
- granted, provided that the above copyright notice appear in all\r
- copies and that both that the copyright notice and this\r
- permission notice and warranty disclaimer appear in supporting\r
- documentation, and that the name of the author not be used in\r
- advertising or publicity pertaining to distribution of the\r
- software without specific, written prior permission.\r
-\r
- The author disclaim all warranties with regard to this\r
- software, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-/** \file\r
- *\r
- * Ethernet frame packet handling routines. This protocol handles the processing of raw Ethernet\r
- * frames sent and receieved, deferring the processing of subpacket protocols to the appropriate\r
- * protocol handlers, such as DHCP or ARP.\r
- */\r
- \r
-#include "Ethernet.h"\r
-\r
-/* Global Variables: */\r
-/** Ethernet Frame buffer structure, to hold the incomming Ethernet frame from the host. */\r
-Ethernet_Frame_Info_t FrameIN;\r
-\r
-/** Ethernet Frame buffer structure, to hold the outgoing Ethernet frame to the host. */\r
-Ethernet_Frame_Info_t FrameOUT;\r
-\r
-/** Constant for convenience when checking against or setting a MAC address to the virtual server MAC address. */\r
-const MAC_Address_t ServerMACAddress = {SERVER_MAC_ADDRESS};\r
-\r
-/** Constant for convenience when checking against or setting an IP address to the virtual server IP address. */\r
-const IP_Address_t ServerIPAddress = {SERVER_IP_ADDRESS};\r
-\r
-/** Constant for convenience when checking against or setting a MAC address to the broadcast MAC address. */\r
-const MAC_Address_t BroadcastMACAddress = {BROADCAST_MAC_ADDRESS};\r
-\r
-/** Constant for convenience when checking against or setting a IP address to the broadcast IP address. */\r
-const IP_Address_t BroadcastIPAddress = {BROADCAST_IP_ADDRESS};\r
-\r
-/** Constant for convenience when checking against or setting an IP address to the client (host) IP address. */\r
-const IP_Address_t ClientIPAddress = {CLIENT_IP_ADDRESS};\r
-\r
-\r
-/** Processes an incomming Ethernet frame, and writes the appropriate response to the output Ethernet\r
- * frame buffer if the sub protocol handlers create a valid response.\r
- */\r
-void Ethernet_ProcessPacket(void)\r
-{\r
- DecodeEthernetFrameHeader(FrameIN.FrameData);\r
-\r
- /* Cast the incomming Ethernet frame to the Ethernet header type */\r
- Ethernet_Frame_Header_t* FrameINHeader = (Ethernet_Frame_Header_t*)&FrameIN.FrameData;\r
- Ethernet_Frame_Header_t* FrameOUTHeader = (Ethernet_Frame_Header_t*)&FrameOUT.FrameData;\r
- \r
- int16_t RetSize = NO_RESPONSE;\r
- \r
- /* Ensure frame is addressed to either all (broadcast) or the virtual webserver, and is a type II frame */\r
- if ((MAC_COMPARE(&FrameINHeader->Destination, &ServerMACAddress) ||\r
- MAC_COMPARE(&FrameINHeader->Destination, &BroadcastMACAddress)) &&\r
- (SwapEndian_16(FrameIN.FrameLength) > ETHERNET_VER2_MINSIZE))\r
- {\r
- /* Process the packet depending on its protocol */\r
- switch (SwapEndian_16(FrameINHeader->EtherType))\r
- {\r
- case ETHERTYPE_ARP:\r
- RetSize = ARP_ProcessARPPacket(&FrameIN.FrameData[sizeof(Ethernet_Frame_Header_t)],\r
- &FrameOUT.FrameData[sizeof(Ethernet_Frame_Header_t)]);\r
- break; \r
- case ETHERTYPE_IPV4:\r
- RetSize = IP_ProcessIPPacket(&FrameIN.FrameData[sizeof(Ethernet_Frame_Header_t)],\r
- &FrameOUT.FrameData[sizeof(Ethernet_Frame_Header_t)]);\r
- break;\r
- }\r
- \r
- /* Protcol processing routine has filled a response, complete the ethernet frame header */\r
- if (RetSize > 0)\r
- {\r
- /* Fill out the response Ethernet frame header */\r
- FrameOUTHeader->Source = ServerMACAddress;\r
- FrameOUTHeader->Destination = FrameINHeader->Source;\r
- FrameOUTHeader->EtherType = FrameINHeader->EtherType;\r
- \r
- /* Set the response length in the buffer and indicate that a response is ready to be sent */\r
- FrameOUT.FrameLength = (sizeof(Ethernet_Frame_Header_t) + RetSize);\r
- FrameOUT.FrameInBuffer = true;\r
- }\r
- }\r
-\r
- /* Check if the packet was processed */\r
- if (RetSize != NO_PROCESS)\r
- {\r
- /* Clear the frame buffer */\r
- FrameIN.FrameInBuffer = false;\r
- }\r
-}\r
-\r
-/** Calculates the appropriate ethernet checksum, consisting of the addition of the one's\r
- * compliment of each word, complimented.\r
- *\r
- * \param Data Pointer to the packet buffer data whose checksum must be calculated\r
- * \param Bytes Number of bytes in the data buffer to process\r
- *\r
- * \return A 16-bit Ethernet checksum value\r
- */\r
-uint16_t Ethernet_Checksum16(void* Data, uint16_t Bytes)\r
-{\r
- uint16_t* Words = (uint16_t*)Data;\r
- uint32_t Checksum = 0;\r
-\r
- for (uint8_t CurrWord = 0; CurrWord < (Bytes >> 1); CurrWord++)\r
- Checksum += Words[CurrWord];\r
- \r
- while (Checksum & 0xFFFF0000)\r
- Checksum = ((Checksum & 0xFFFF) + (Checksum >> 16));\r
- \r
- return ~Checksum;\r
-}\r
projects / pub / lufa.git / blobdiff