85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/*
|
|
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
|
|
*
|
|
* User Datagram Protocol (UDP) packet handling routines. This protocol handles high throughput, low
|
|
* reliability packets which are typically used to encapsulate streaming data.
|
|
*/
|
|
|
|
#define INCLUDE_FROM_UDP_C
|
|
#include "UDP.h"
|
|
|
|
/** Processes a UDP packet inside an Ethernet frame, and writes the appropriate response
|
|
* to the output Ethernet frame if a sub-protocol handler has created a response packet.
|
|
*
|
|
* \param[in] IPHeaderInStart Pointer to the start of the incoming packet's IP header
|
|
* \param[in] UDPHeaderInStart Pointer to the start of the incoming packet's UDP header
|
|
* \param[out] UDPHeaderOutStart Pointer to the start of the outgoing packet's UDP header
|
|
*
|
|
* \return The number of bytes written to the out Ethernet frame if any, NO_RESPONSE otherwise
|
|
*/
|
|
int16_t UDP_ProcessUDPPacket(void* IPHeaderInStart,
|
|
void* UDPHeaderInStart,
|
|
void* UDPHeaderOutStart)
|
|
{
|
|
UDP_Header_t* UDPHeaderIN = (UDP_Header_t*)UDPHeaderInStart;
|
|
UDP_Header_t* UDPHeaderOUT = (UDP_Header_t*)UDPHeaderOutStart;
|
|
|
|
int16_t RetSize = NO_RESPONSE;
|
|
|
|
DecodeUDPHeader(UDPHeaderInStart);
|
|
|
|
switch (SwapEndian_16(UDPHeaderIN->DestinationPort))
|
|
{
|
|
case UDP_PORT_DHCP_REQUEST:
|
|
RetSize = DHCP_ProcessDHCPPacket(IPHeaderInStart,
|
|
&((uint8_t*)UDPHeaderInStart)[sizeof(UDP_Header_t)],
|
|
&((uint8_t*)UDPHeaderOutStart)[sizeof(UDP_Header_t)]);
|
|
break;
|
|
}
|
|
|
|
/* Check to see if the protocol processing routine has filled out a response */
|
|
if (RetSize > 0)
|
|
{
|
|
/* Fill out the response UDP packet header */
|
|
UDPHeaderOUT->SourcePort = UDPHeaderIN->DestinationPort;
|
|
UDPHeaderOUT->DestinationPort = UDPHeaderIN->SourcePort;
|
|
UDPHeaderOUT->Checksum = 0;
|
|
UDPHeaderOUT->Length = SwapEndian_16(sizeof(UDP_Header_t) + RetSize);
|
|
|
|
/* Return the size of the response so far */
|
|
return (sizeof(UDP_Header_t) + RetSize);
|
|
}
|
|
|
|
return NO_RESPONSE;
|
|
}
|
|
|