2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS TCP/IP protocol driver
4 * FILE: transport/udp/udp.c
5 * PURPOSE: User Datagram Protocol routines
6 * PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
8 * CSH 01/08-2000 Created
14 BOOLEAN UDPInitialized
= FALSE
;
17 NTSTATUS
AddUDPHeaderIPv4(
18 PIP_ADDRESS RemoteAddress
,
20 PIP_ADDRESS LocalAddress
,
25 * FUNCTION: Adds an IPv4 and UDP header to an IP packet
27 * SendRequest = Pointer to send request
28 * LocalAddress = Pointer to our local address
29 * LocalPort = The port we send this datagram from
30 * IPPacket = Pointer to IP packet
35 PUDP_HEADER UDPHeader
;
37 TI_DbgPrint(MID_TRACE
, ("Packet: %x NdisPacket %x\n",
38 IPPacket
, IPPacket
->NdisPacket
));
41 ( RemoteAddress
, RemotePort
,
42 LocalAddress
, LocalPort
,
43 IPPacket
, DataLength
, IPPROTO_UDP
,
44 sizeof(UDP_HEADER
), (PVOID
*)&UDPHeader
);
46 /* Build UDP header */
47 UDPHeader
= (PUDP_HEADER
)((ULONG_PTR
)IPPacket
->Data
- sizeof(UDP_HEADER
));
48 /* Port values are already big-endian values */
49 UDPHeader
->SourcePort
= LocalPort
;
50 UDPHeader
->DestPort
= RemotePort
;
51 /* FIXME: Calculate UDP checksum and put it in UDP header */
52 UDPHeader
->Checksum
= 0;
53 /* Length of UDP header and data */
54 UDPHeader
->Length
= WH2N(DataLength
+ sizeof(UDP_HEADER
));
56 IPPacket
->Data
= ((PCHAR
)UDPHeader
) + sizeof(UDP_HEADER
);
58 TI_DbgPrint(MID_TRACE
, ("Packet: %d ip %d udp %d payload\n",
59 (PCHAR
)UDPHeader
- (PCHAR
)IPPacket
->Header
,
60 (PCHAR
)IPPacket
->Data
- (PCHAR
)UDPHeader
,
63 return STATUS_SUCCESS
;
67 NTSTATUS
BuildUDPPacket(
69 PIP_ADDRESS RemoteAddress
,
71 PIP_ADDRESS LocalAddress
,
76 * FUNCTION: Builds an UDP packet
78 * Context = Pointer to context information (DATAGRAM_SEND_REQUEST)
79 * LocalAddress = Pointer to our local address
80 * LocalPort = The port we send this datagram from
81 * IPPacket = Address of pointer to IP packet
88 TI_DbgPrint(MAX_TRACE
, ("Called.\n"));
90 /* FIXME: Assumes IPv4 */
91 IPInitializePacket(Packet
, IP_ADDRESS_V4
);
93 return STATUS_INSUFFICIENT_RESOURCES
;
95 Packet
->TotalSize
= sizeof(IPv4_HEADER
) + sizeof(UDP_HEADER
) + DataLen
;
98 Status
= AllocatePacketWithBuffer( &Packet
->NdisPacket
,
100 Packet
->TotalSize
+ MaxLLHeaderSize
);
102 if( !NT_SUCCESS(Status
) ) return Status
;
104 TI_DbgPrint(MID_TRACE
, ("Allocated packet: %x\n", Packet
->NdisPacket
));
105 TI_DbgPrint(MID_TRACE
, ("Local Addr : %s\n", A2S(LocalAddress
)));
106 TI_DbgPrint(MID_TRACE
, ("Remote Addr: %s\n", A2S(RemoteAddress
)));
108 switch (RemoteAddress
->Type
) {
110 Status
= AddUDPHeaderIPv4(RemoteAddress
, RemotePort
,
111 LocalAddress
, LocalPort
, Packet
, DataLen
);
114 /* FIXME: Support IPv6 */
115 TI_DbgPrint(MIN_TRACE
, ("IPv6 UDP datagrams are not supported.\n"));
117 Status
= STATUS_UNSUCCESSFUL
;
120 if (!NT_SUCCESS(Status
)) {
121 TI_DbgPrint(MIN_TRACE
, ("Cannot add UDP header. Status = (0x%X)\n",
123 FreeNdisPacket(Packet
->NdisPacket
);
127 TI_DbgPrint(MID_TRACE
, ("Copying data (hdr %x data %x (%d))\n",
128 Packet
->Header
, Packet
->Data
,
129 (PCHAR
)Packet
->Data
- (PCHAR
)Packet
->Header
));
131 RtlCopyMemory( Packet
->Data
, DataBuffer
, DataLen
);
133 TI_DbgPrint(MID_TRACE
, ("Displaying packet\n"));
135 DISPLAY_IP_PACKET(Packet
);
137 TI_DbgPrint(MID_TRACE
, ("Leaving\n"));
139 return STATUS_SUCCESS
;
142 VOID UDPSendPacketComplete
143 ( PVOID Context
, PNDIS_PACKET Packet
, NDIS_STATUS Status
) {
144 FreeNdisPacket( Packet
);
147 NTSTATUS
UDPSendDatagram(
148 PADDRESS_FILE AddrFile
,
149 PTDI_CONNECTION_INFORMATION ConnInfo
,
154 * FUNCTION: Sends an UDP datagram to a remote address
156 * Request = Pointer to TDI request
157 * ConnInfo = Pointer to connection information
158 * Buffer = Pointer to NDIS buffer with data
159 * DataSize = Size in bytes of data to be sent
161 * Status of operation
165 PTA_IP_ADDRESS RemoteAddressTa
= (PTA_IP_ADDRESS
)ConnInfo
->RemoteAddress
;
166 IP_ADDRESS RemoteAddress
;
169 PNEIGHBOR_CACHE_ENTRY NCE
;
171 TI_DbgPrint(MID_TRACE
,("Sending Datagram(%x %x %x %d)\n",
172 AddrFile
, ConnInfo
, BufferData
, DataSize
));
173 TI_DbgPrint(MID_TRACE
,("RemoteAddressTa: %x\n", RemoteAddressTa
));
175 switch( RemoteAddressTa
->Address
[0].AddressType
) {
176 case TDI_ADDRESS_TYPE_IP
:
177 RemoteAddress
.Type
= IP_ADDRESS_V4
;
178 RemoteAddress
.Address
.IPv4Address
=
179 RemoteAddressTa
->Address
[0].Address
[0].in_addr
;
180 RemotePort
= RemoteAddressTa
->Address
[0].Address
[0].sin_port
;
184 return STATUS_UNSUCCESSFUL
;
187 Status
= BuildUDPPacket( &Packet
,
195 if( !NT_SUCCESS(Status
) )
198 if(!(NCE
= RouteGetRouteToDestination( &RemoteAddress
)))
199 return STATUS_UNSUCCESSFUL
;
201 IPSendDatagram( &Packet
, NCE
, UDPSendPacketComplete
, NULL
);
203 return STATUS_SUCCESS
;
207 VOID
UDPReceive(PIP_INTERFACE Interface
, PIP_PACKET IPPacket
)
209 * FUNCTION: Receives and queues a UDP datagram
211 * NTE = Pointer to net table entry which the packet was received on
212 * IPPacket = Pointer to an IP packet that was received
214 * This is the low level interface for receiving UDP datagrams. It strips
215 * the UDP header from a packet and delivers the data to anyone that wants it
218 AF_SEARCH SearchContext
;
219 PIPv4_HEADER IPv4Header
;
220 PADDRESS_FILE AddrFile
;
221 PUDP_HEADER UDPHeader
;
222 PIP_ADDRESS DstAddress
, SrcAddress
;
225 TI_DbgPrint(MAX_TRACE
, ("Called.\n"));
227 switch (IPPacket
->Type
) {
230 IPv4Header
= IPPacket
->Header
;
231 DstAddress
= &IPPacket
->DstAddr
;
232 SrcAddress
= &IPPacket
->SrcAddr
;
237 TI_DbgPrint(MIN_TRACE
, ("Discarded IPv6 UDP datagram (%i bytes).\n", IPPacket
->TotalSize
));
239 /* FIXME: IPv6 is not supported */
246 UDPHeader
= (PUDP_HEADER
)IPPacket
->Data
;
248 /* FIXME: Calculate and validate UDP checksum */
251 i
= WH2N(UDPHeader
->Length
);
252 if ((i
< sizeof(UDP_HEADER
)) || (i
> IPPacket
->TotalSize
- IPPacket
->Position
)) {
253 /* Incorrect or damaged packet received, discard it */
254 TI_DbgPrint(MIN_TRACE
, ("Incorrect or damaged UDP packet received.\n"));
258 DataSize
= i
- sizeof(UDP_HEADER
);
260 /* Go to UDP data area */
261 IPPacket
->Data
= (PVOID
)((ULONG_PTR
)IPPacket
->Data
+ sizeof(UDP_HEADER
));
263 /* Locate a receive request on destination address file object
264 and deliver the packet if one is found. If there is no receive
265 request on the address file object, call the associated receive
266 handler. If no receive handler is registered, drop the packet */
268 AddrFile
= AddrSearchFirst(DstAddress
,
274 DGDeliverData(AddrFile
,
277 UDPHeader
->SourcePort
,
281 } while ((AddrFile
= AddrSearchNext(&SearchContext
)) != NULL
);
283 /* There are no open address files that will take this datagram */
284 /* FIXME: IPv4 only */
285 TI_DbgPrint(MID_TRACE
, ("Cannot deliver IPv4 UDP datagram to address (0x%X).\n",
286 DN2H(DstAddress
->Address
.IPv4Address
)));
288 /* FIXME: Send ICMP reply */
290 TI_DbgPrint(MAX_TRACE
, ("Leaving.\n"));
297 * FUNCTION: Initializes the UDP subsystem
299 * Status of operation
303 RtlZeroMemory(&UDPStats
, sizeof(UDP_STATISTICS
));
308 Status
= PortsStartup( &UDPPorts
, 1, 0xfffe );
310 if( !NT_SUCCESS(Status
) ) return Status
;
312 /* Register this protocol with IP layer */
313 IPRegisterProtocol(IPPROTO_UDP
, UDPReceive
);
315 UDPInitialized
= TRUE
;
317 return STATUS_SUCCESS
;
321 NTSTATUS
UDPShutdown(
324 * FUNCTION: Shuts down the UDP subsystem
326 * Status of operation
330 return STATUS_SUCCESS
;
332 PortsShutdown( &UDPPorts
);
334 /* Deregister this protocol with IP layer */
335 IPRegisterProtocol(IPPROTO_UDP
, NULL
);
337 UDPInitialized
= FALSE
;
339 return STATUS_SUCCESS
;
342 UINT
UDPAllocatePort( UINT HintPort
) {
344 if( AllocatePort( &UDPPorts
, HintPort
) ) return HintPort
;
345 else return (UINT
)-1;
346 } else return AllocatePortFromRange
347 ( &UDPPorts
, UDP_STARTING_PORT
,
348 UDP_STARTING_PORT
+ UDP_DYNAMIC_PORTS
);
351 VOID
UDPFreePort( UINT Port
) {
352 DeallocatePort( &UDPPorts
, Port
);