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Diffstat (limited to 'Demos/RNDISEthernet/UDP.c')
| -rw-r--r-- | Demos/RNDISEthernet/UDP.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/Demos/RNDISEthernet/UDP.c b/Demos/RNDISEthernet/UDP.c new file mode 100644 index 000000000..3e1f9395b --- /dev/null +++ b/Demos/RNDISEthernet/UDP.c @@ -0,0 +1,80 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, and distribute this software
+ and its documentation for any purpose and without fee is hereby
+ granted, 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 disclaim 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 subprotocol handler has created a response packet.
+ *
+ * \param IPHeaderInStart Pointer to the start of the incomming packet's IP header
+ * \param UDPHeaderInStart Pointer to the start of the incomming packet's UDP header
+ * \param 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);
+
+ /* Check to see if the UDP packet is a DHCP packet */
+ if (SwapEndian_16(UDPHeaderIN->DestinationPort) == UDP_PORT_DHCP_REQUEST)
+ {
+ RetSize = DHCP_ProcessDHCPPacket(IPHeaderInStart,
+ &((uint8_t*)UDPHeaderInStart)[sizeof(UDP_Header_t)],
+ &((uint8_t*)UDPHeaderOutStart)[sizeof(UDP_Header_t)]);
+ }
+
+ /* 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;
+}
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