1 files changed, 129 insertions, 0 deletions
diff --git a/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/DHCP.c b/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/DHCP.c
new file mode 100644
index 000000000..6f7b40af6
--- /dev/null
+++ b/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/DHCP.c
@@ -0,0 +1,129 @@
+/*
+             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
+ *
+ *  Dynamic Host Configuration Protocol (DHCP) packet handling routines. This protocol
+ *  handles the automatic IP negotiation to the host, so that the host will use the provided
+ *  IP address given to it by the device.
+ */
+#include "DHCP.h"
+/** Processes a DHCP packet inside an Ethernet frame, and writes the appropriate response
+ *  to the output Ethernet frame if the host is requesting or accepting an IP address.
+ *
+ *  \param[in] IPHeaderInStart      Pointer to the start of the incoming packet's IP header
+ *  \param[in] DHCPHeaderInStart    Pointer to the start of the incoming packet's DHCP header
+ *  \param[out] DHCPHeaderOutStart  Pointer to the start of the outgoing packet's DHCP header
+ *
+ *  \return The number of bytes written to the out Ethernet frame if any, NO_RESPONSE otherwise
+ */
+int16_t DHCP_ProcessDHCPPacket(void* IPHeaderInStart,
+                               void* DHCPHeaderInStart,
+                               void* DHCPHeaderOutStart)
+{
+        IP_Header_t*   IPHeaderIN    = (IP_Header_t*)IPHeaderInStart;
+        DHCP_Header_t* DHCPHeaderIN  = (DHCP_Header_t*)DHCPHeaderInStart;
+        DHCP_Header_t* DHCPHeaderOUT = (DHCP_Header_t*)DHCPHeaderOutStart;
+        uint8_t* DHCPOptionsINStart  = (uint8_t*)(DHCPHeaderInStart  + sizeof(DHCP_Header_t));
+        uint8_t* DHCPOptionsOUTStart = (uint8_t*)(DHCPHeaderOutStart + sizeof(DHCP_Header_t));
+        DecodeDHCPHeader(DHCPHeaderInStart);
+        /* Zero out the response DHCP packet, as much of it is legacy and left at 0 */
+        memset(DHCPHeaderOUT, 0, sizeof(DHCP_Header_t));
+        /* Fill out the response DHCP packet */
+        DHCPHeaderOUT->HardwareType          = DHCPHeaderIN->HardwareType;
+        DHCPHeaderOUT->Operation             = DHCP_OP_BOOTREPLY;
+        DHCPHeaderOUT->HardwareAddressLength = DHCPHeaderIN->HardwareAddressLength;
+        DHCPHeaderOUT->Hops                  = 0;
+        DHCPHeaderOUT->TransactionID         = DHCPHeaderIN->TransactionID;
+        DHCPHeaderOUT->ElapsedSeconds        = 0;
+        DHCPHeaderOUT->Flags                 = DHCPHeaderIN->Flags;
+        DHCPHeaderOUT->YourIP                = ClientIPAddress;
+        memmove(&DHCPHeaderOUT->ClientHardwareAddress, &DHCPHeaderIN->ClientHardwareAddress, sizeof(MAC_Address_t));
+        DHCPHeaderOUT->Cookie                = SwapEndian_32(DHCP_MAGIC_COOKIE);
+        /* Alter the incoming IP packet header so that the corrected IP source and destinations are used - this means that
+           when the response IP header is generated, it will use the corrected addresses and not the null/broatcast addresses */
+        IPHeaderIN->SourceAddress      = ClientIPAddress;
+        IPHeaderIN->DestinationAddress = ServerIPAddress;
+        /* Process the incoming DHCP packet options */
+        while (DHCPOptionsINStart[0] != DHCP_OPTION_END)
+        {
+                /* Find the Message Type DHCP option, to determine the type of DHCP packet */
+                if (DHCPOptionsINStart[0] == DHCP_OPTION_MESSAGETYPE)
+                {
+                        if ((DHCPOptionsINStart[2] == DHCP_MESSAGETYPE_DISCOVER) || (DHCPOptionsINStart[2] == DHCP_MESSAGETYPE_REQUEST))
+                        {
+                                /* Fill out the response DHCP packet options for a DHCP OFFER or ACK response */
+                                *(DHCPOptionsOUTStart++) = DHCP_OPTION_MESSAGETYPE;
+                                *(DHCPOptionsOUTStart++) = 1;
+                                *(DHCPOptionsOUTStart++) = (DHCPOptionsINStart[2] == DHCP_MESSAGETYPE_DISCOVER) ? DHCP_MESSAGETYPE_OFFER
+                                                                                                                                                                                                : DHCP_MESSAGETYPE_ACK;
+                                *(DHCPOptionsOUTStart++) = DHCP_OPTION_SUBNETMASK;
+                                *(DHCPOptionsOUTStart++) = sizeof(IP_Address_t);
+                                *(DHCPOptionsOUTStart++) = 0xFF;
+                                *(DHCPOptionsOUTStart++) = 0xFF;
+                                *(DHCPOptionsOUTStart++) = 0xFF;
+                                *(DHCPOptionsOUTStart++) = 0x00;
+                                *(DHCPOptionsOUTStart++) = DHCP_OPTION_LEASETIME;
+                                *(DHCPOptionsOUTStart++) = sizeof(uint32_t);
+                                /* Lease Time 86400s (ONE_DAY) */
+                                *(DHCPOptionsOUTStart++) = 0x00;
+                                *(DHCPOptionsOUTStart++) = 0x01;
+                                *(DHCPOptionsOUTStart++) = 0x51;
+                                *(DHCPOptionsOUTStart++) = 0x80;
+                                *(DHCPOptionsOUTStart++) = DHCP_OPTION_DHCPSERVER;
+                                *(DHCPOptionsOUTStart++) = sizeof(IP_Address_t);
+                                memcpy(DHCPOptionsOUTStart, &ServerIPAddress, sizeof(IP_Address_t));
+                                DHCPOptionsOUTStart     += sizeof(IP_Address_t);
+                                *(DHCPOptionsOUTStart++) = DHCP_OPTION_END;
+                                return (sizeof(DHCP_Header_t) + 18 + sizeof(IP_Address_t));
+                        }
+                }
+                /* Go to the next DHCP option - skip one byte if option is a padding byte, else skip the complete option's size */
+                DHCPOptionsINStart += ((DHCPOptionsINStart[0] == DHCP_OPTION_PAD) ? 1 : (DHCPOptionsINStart[1] + 2));
+        }
+        return NO_RESPONSE;
+}

diff --git a/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/DHCP.c b/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/DHCP.c new file mode 100644 index 000000000..6f7b40af6 --- /dev/null +++ b/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/DHCP.c
@@ -0,0 +1,129 @@
	1	/*
	2	LUFA Library
	3	Copyright (C) Dean Camera, 2017.
	4
	5	dean [at] fourwalledcubicle [dot] com
	6	www.lufa-lib.org
	7	*/
	8
	9	/*
	10	Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
	11
	12	Permission to use, copy, modify, distribute, and sell this
	13	software and its documentation for any purpose is hereby granted
	14	without fee, provided that the above copyright notice appear in
	15	all copies and that both that the copyright notice and this
	16	permission notice and warranty disclaimer appear in supporting
	17	documentation, and that the name of the author not be used in
	18	advertising or publicity pertaining to distribution of the
	19	software without specific, written prior permission.
	20
	21	The author disclaims all warranties with regard to this
	22	software, including all implied warranties of merchantability
	23	and fitness. In no event shall the author be liable for any
	24	special, indirect or consequential damages or any damages
	25	whatsoever resulting from loss of use, data or profits, whether
	26	in an action of contract, negligence or other tortious action,
	27	arising out of or in connection with the use or performance of
	28	this software.
	29	*/
	30
	31	/** \file
	32	*
	33	* Dynamic Host Configuration Protocol (DHCP) packet handling routines. This protocol
	34	* handles the automatic IP negotiation to the host, so that the host will use the provided
	35	* IP address given to it by the device.
	36	*/
	37
	38	#include "DHCP.h"
	39
	40	/** Processes a DHCP packet inside an Ethernet frame, and writes the appropriate response
	41	* to the output Ethernet frame if the host is requesting or accepting an IP address.
	42	*
	43	* \param[in] IPHeaderInStart Pointer to the start of the incoming packet's IP header
	44	* \param[in] DHCPHeaderInStart Pointer to the start of the incoming packet's DHCP header
	45	* \param[out] DHCPHeaderOutStart Pointer to the start of the outgoing packet's DHCP header
	46	*
	47	* \return The number of bytes written to the out Ethernet frame if any, NO_RESPONSE otherwise
	48	*/
	49	int16_t DHCP_ProcessDHCPPacket(void* IPHeaderInStart,
	50	void* DHCPHeaderInStart,
	51	void* DHCPHeaderOutStart)
	52	{
	53	IP_Header_t* IPHeaderIN = (IP_Header_t*)IPHeaderInStart;
	54	DHCP_Header_t* DHCPHeaderIN = (DHCP_Header_t*)DHCPHeaderInStart;
	55	DHCP_Header_t* DHCPHeaderOUT = (DHCP_Header_t*)DHCPHeaderOutStart;
	56
	57	uint8_t* DHCPOptionsINStart = (uint8_t*)(DHCPHeaderInStart + sizeof(DHCP_Header_t));
	58	uint8_t* DHCPOptionsOUTStart = (uint8_t*)(DHCPHeaderOutStart + sizeof(DHCP_Header_t));
	59
	60	DecodeDHCPHeader(DHCPHeaderInStart);
	61
	62	/* Zero out the response DHCP packet, as much of it is legacy and left at 0 */
	63	memset(DHCPHeaderOUT, 0, sizeof(DHCP_Header_t));
	64
	65	/* Fill out the response DHCP packet */
	66	DHCPHeaderOUT->HardwareType = DHCPHeaderIN->HardwareType;
	67	DHCPHeaderOUT->Operation = DHCP_OP_BOOTREPLY;
	68	DHCPHeaderOUT->HardwareAddressLength = DHCPHeaderIN->HardwareAddressLength;
	69	DHCPHeaderOUT->Hops = 0;
	70	DHCPHeaderOUT->TransactionID = DHCPHeaderIN->TransactionID;
	71	DHCPHeaderOUT->ElapsedSeconds = 0;
	72	DHCPHeaderOUT->Flags = DHCPHeaderIN->Flags;
	73	DHCPHeaderOUT->YourIP = ClientIPAddress;
	74	memmove(&DHCPHeaderOUT->ClientHardwareAddress, &DHCPHeaderIN->ClientHardwareAddress, sizeof(MAC_Address_t));
	75	DHCPHeaderOUT->Cookie = SwapEndian_32(DHCP_MAGIC_COOKIE);
	76
	77	/* Alter the incoming IP packet header so that the corrected IP source and destinations are used - this means that
	78	when the response IP header is generated, it will use the corrected addresses and not the null/broatcast addresses */
	79	IPHeaderIN->SourceAddress = ClientIPAddress;
	80	IPHeaderIN->DestinationAddress = ServerIPAddress;
	81
	82	/* Process the incoming DHCP packet options */
	83	while (DHCPOptionsINStart[0] != DHCP_OPTION_END)
	84	{
	85	/* Find the Message Type DHCP option, to determine the type of DHCP packet */
	86	if (DHCPOptionsINStart[0] == DHCP_OPTION_MESSAGETYPE)
	87	{
	88	if ((DHCPOptionsINStart[2] == DHCP_MESSAGETYPE_DISCOVER) \|\| (DHCPOptionsINStart[2] == DHCP_MESSAGETYPE_REQUEST))
	89	{
	90	/* Fill out the response DHCP packet options for a DHCP OFFER or ACK response */
	91
	92	*(DHCPOptionsOUTStart++) = DHCP_OPTION_MESSAGETYPE;
	93	*(DHCPOptionsOUTStart++) = 1;
	94	*(DHCPOptionsOUTStart++) = (DHCPOptionsINStart[2] == DHCP_MESSAGETYPE_DISCOVER) ? DHCP_MESSAGETYPE_OFFER
	95	: DHCP_MESSAGETYPE_ACK;
	96
	97	*(DHCPOptionsOUTStart++) = DHCP_OPTION_SUBNETMASK;
	98	*(DHCPOptionsOUTStart++) = sizeof(IP_Address_t);
	99	*(DHCPOptionsOUTStart++) = 0xFF;
	100	*(DHCPOptionsOUTStart++) = 0xFF;
	101	*(DHCPOptionsOUTStart++) = 0xFF;
	102	*(DHCPOptionsOUTStart++) = 0x00;
	103
	104	*(DHCPOptionsOUTStart++) = DHCP_OPTION_LEASETIME;
	105	*(DHCPOptionsOUTStart++) = sizeof(uint32_t);
	106	/* Lease Time 86400s (ONE_DAY) */
	107	*(DHCPOptionsOUTStart++) = 0x00;
	108	*(DHCPOptionsOUTStart++) = 0x01;
	109	*(DHCPOptionsOUTStart++) = 0x51;
	110	*(DHCPOptionsOUTStart++) = 0x80;
	111
	112	*(DHCPOptionsOUTStart++) = DHCP_OPTION_DHCPSERVER;
	113	*(DHCPOptionsOUTStart++) = sizeof(IP_Address_t);
	114	memcpy(DHCPOptionsOUTStart, &ServerIPAddress, sizeof(IP_Address_t));
	115	DHCPOptionsOUTStart += sizeof(IP_Address_t);
	116
	117	*(DHCPOptionsOUTStart++) = DHCP_OPTION_END;
	118
	119	return (sizeof(DHCP_Header_t) + 18 + sizeof(IP_Address_t));
	120	}
	121	}
	122
	123	/* Go to the next DHCP option - skip one byte if option is a padding byte, else skip the complete option's size */
	124	DHCPOptionsINStart += ((DHCPOptionsINStart[0] == DHCP_OPTION_PAD) ? 1 : (DHCPOptionsINStart[1] + 2));
	125	}
	126
	127	return NO_RESPONSE;
	128	}
	129