84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* User Datagram Protocol (UDP) packet handling routines. This protocol handles high throughput, low
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* reliability packets which are typically used to encapsulate streaming data.
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*/
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#define INCLUDE_FROM_UDP_C
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#include "UDP.h"
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/** Processes a UDP packet inside an Ethernet frame, and writes the appropriate response
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* to the output Ethernet frame if a sub-protocol handler has created a response packet.
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*
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* \param[in] IPHeaderInStart Pointer to the start of the incoming packet's IP header
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* \param[in] UDPHeaderInStart Pointer to the start of the incoming packet's UDP header
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* \param[out] UDPHeaderOutStart Pointer to the start of the outgoing packet's UDP header
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*
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* \return The number of bytes written to the out Ethernet frame if any, NO_RESPONSE otherwise
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*/
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int16_t UDP_ProcessUDPPacket(void* IPHeaderInStart,
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void* UDPHeaderInStart,
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void* UDPHeaderOutStart)
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{
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UDP_Header_t* UDPHeaderIN = (UDP_Header_t*)UDPHeaderInStart;
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UDP_Header_t* UDPHeaderOUT = (UDP_Header_t*)UDPHeaderOutStart;
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int16_t RetSize = NO_RESPONSE;
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DecodeUDPHeader(UDPHeaderInStart);
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switch (SwapEndian_16(UDPHeaderIN->DestinationPort))
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{
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case UDP_PORT_DHCP_REQUEST:
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RetSize = DHCP_ProcessDHCPPacket(IPHeaderInStart,
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&((uint8_t*)UDPHeaderInStart)[sizeof(UDP_Header_t)],
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&((uint8_t*)UDPHeaderOutStart)[sizeof(UDP_Header_t)]);
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break;
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}
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/* Check to see if the protocol processing routine has filled out a response */
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if (RetSize > 0)
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{
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/* Fill out the response UDP packet header */
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UDPHeaderOUT->SourcePort = UDPHeaderIN->DestinationPort;
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UDPHeaderOUT->DestinationPort = UDPHeaderIN->SourcePort;
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UDPHeaderOUT->Checksum = 0;
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UDPHeaderOUT->Length = SwapEndian_16(sizeof(UDP_Header_t) + RetSize);
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/* Return the size of the response so far */
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return (sizeof(UDP_Header_t) + RetSize);
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}
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return NO_RESPONSE;
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}
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