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
13 BOOLEAN UDPInitialized
= FALSE
;
16 NTSTATUS
AddUDPHeaderIPv4(
17 PADDRESS_FILE AddrFile
,
18 PIP_ADDRESS RemoteAddress
,
20 PIP_ADDRESS LocalAddress
,
26 * FUNCTION: Adds an IPv4 and UDP header to an IP packet
28 * SendRequest = Pointer to send request
29 * LocalAddress = Pointer to our local address
30 * LocalPort = The port we send this datagram from
31 * IPPacket = Pointer to IP packet
36 PUDP_HEADER UDPHeader
;
39 TI_DbgPrint(MID_TRACE
, ("Packet: %x NdisPacket %x\n",
40 IPPacket
, IPPacket
->NdisPacket
));
42 Status
= AddGenericHeaderIPv4
43 ( AddrFile
, RemoteAddress
, RemotePort
,
44 LocalAddress
, LocalPort
,
45 IPPacket
, DataLength
, IPPROTO_UDP
,
46 sizeof(UDP_HEADER
), (PVOID
*)&UDPHeader
);
48 if (!NT_SUCCESS(Status
))
51 /* Port values are already big-endian values */
52 UDPHeader
->SourcePort
= LocalPort
;
53 UDPHeader
->DestPort
= RemotePort
;
54 UDPHeader
->Checksum
= 0;
55 /* Length of UDP header and data */
56 UDPHeader
->Length
= WH2N(DataLength
+ sizeof(UDP_HEADER
));
58 TI_DbgPrint(MID_TRACE
, ("Copying data (hdr %x data %x (%d))\n",
59 IPPacket
->Header
, IPPacket
->Data
,
60 (PCHAR
)IPPacket
->Data
- (PCHAR
)IPPacket
->Header
));
62 RtlCopyMemory(IPPacket
->Data
, Data
, DataLength
);
64 UDPHeader
->Checksum
= UDPv4ChecksumCalculate((PIPv4_HEADER
)IPPacket
->Header
,
66 DataLength
+ sizeof(UDP_HEADER
));
67 UDPHeader
->Checksum
= WH2N(UDPHeader
->Checksum
);
69 TI_DbgPrint(MID_TRACE
, ("Packet: %d ip %d udp %d payload\n",
70 (PCHAR
)UDPHeader
- (PCHAR
)IPPacket
->Header
,
71 (PCHAR
)IPPacket
->Data
- (PCHAR
)UDPHeader
,
74 return STATUS_SUCCESS
;
78 NTSTATUS
BuildUDPPacket(
79 PADDRESS_FILE AddrFile
,
81 PIP_ADDRESS RemoteAddress
,
83 PIP_ADDRESS LocalAddress
,
88 * FUNCTION: Builds an UDP packet
90 * Context = Pointer to context information (DATAGRAM_SEND_REQUEST)
91 * LocalAddress = Pointer to our local address
92 * LocalPort = The port we send this datagram from
93 * IPPacket = Address of pointer to IP packet
100 TI_DbgPrint(MAX_TRACE
, ("Called.\n"));
102 /* FIXME: Assumes IPv4 */
103 IPInitializePacket(Packet
, IP_ADDRESS_V4
);
105 Packet
->TotalSize
= sizeof(IPv4_HEADER
) + sizeof(UDP_HEADER
) + DataLen
;
108 Status
= AllocatePacketWithBuffer( &Packet
->NdisPacket
,
112 if( !NT_SUCCESS(Status
) ) return Status
;
114 TI_DbgPrint(MID_TRACE
, ("Allocated packet: %x\n", Packet
->NdisPacket
));
115 TI_DbgPrint(MID_TRACE
, ("Local Addr : %s\n", A2S(LocalAddress
)));
116 TI_DbgPrint(MID_TRACE
, ("Remote Addr: %s\n", A2S(RemoteAddress
)));
118 switch (RemoteAddress
->Type
) {
120 Status
= AddUDPHeaderIPv4(AddrFile
, RemoteAddress
, RemotePort
,
121 LocalAddress
, LocalPort
, Packet
, DataBuffer
, DataLen
);
124 /* FIXME: Support IPv6 */
125 TI_DbgPrint(MIN_TRACE
, ("IPv6 UDP datagrams are not supported.\n"));
127 Status
= STATUS_UNSUCCESSFUL
;
130 if (!NT_SUCCESS(Status
)) {
131 TI_DbgPrint(MIN_TRACE
, ("Cannot add UDP header. Status = (0x%X)\n",
133 FreeNdisPacket(Packet
->NdisPacket
);
137 TI_DbgPrint(MID_TRACE
, ("Displaying packet\n"));
139 DISPLAY_IP_PACKET(Packet
);
141 TI_DbgPrint(MID_TRACE
, ("Leaving\n"));
143 return STATUS_SUCCESS
;
146 VOID UDPSendPacketComplete
147 ( PVOID Context
, PNDIS_PACKET Packet
, NDIS_STATUS Status
) {
148 FreeNdisPacket( Packet
);
151 NTSTATUS
UDPSendDatagram(
152 PADDRESS_FILE AddrFile
,
153 PTDI_CONNECTION_INFORMATION ConnInfo
,
158 * FUNCTION: Sends an UDP datagram to a remote address
160 * Request = Pointer to TDI request
161 * ConnInfo = Pointer to connection information
162 * Buffer = Pointer to NDIS buffer with data
163 * DataSize = Size in bytes of data to be sent
165 * Status of operation
169 PTA_IP_ADDRESS RemoteAddressTa
= (PTA_IP_ADDRESS
)ConnInfo
->RemoteAddress
;
170 IP_ADDRESS RemoteAddress
;
171 IP_ADDRESS LocalAddress
;
174 PNEIGHBOR_CACHE_ENTRY NCE
;
177 LockObject(AddrFile
, &OldIrql
);
179 TI_DbgPrint(MID_TRACE
,("Sending Datagram(%x %x %x %d)\n",
180 AddrFile
, ConnInfo
, BufferData
, DataSize
));
181 TI_DbgPrint(MID_TRACE
,("RemoteAddressTa: %x\n", RemoteAddressTa
));
183 switch( RemoteAddressTa
->Address
[0].AddressType
) {
184 case TDI_ADDRESS_TYPE_IP
:
185 RemoteAddress
.Type
= IP_ADDRESS_V4
;
186 RemoteAddress
.Address
.IPv4Address
=
187 RemoteAddressTa
->Address
[0].Address
[0].in_addr
;
188 RemotePort
= RemoteAddressTa
->Address
[0].Address
[0].sin_port
;
192 UnlockObject(AddrFile
, OldIrql
);
193 return STATUS_UNSUCCESSFUL
;
196 LocalAddress
= AddrFile
->Address
;
197 if (AddrIsUnspecified(&LocalAddress
))
199 /* If the local address is unspecified (0),
200 * then use the unicast address of the
201 * interface we're sending over
203 if(!(NCE
= RouteGetRouteToDestination( &RemoteAddress
))) {
204 UnlockObject(AddrFile
, OldIrql
);
205 return STATUS_NETWORK_UNREACHABLE
;
208 LocalAddress
= NCE
->Interface
->Unicast
;
212 if(!(NCE
= NBLocateNeighbor( &LocalAddress
))) {
213 UnlockObject(AddrFile
, OldIrql
);
214 return STATUS_INVALID_PARAMETER
;
218 Status
= BuildUDPPacket( AddrFile
,
227 UnlockObject(AddrFile
, OldIrql
);
229 if( !NT_SUCCESS(Status
) )
232 if (!NT_SUCCESS(Status
= IPSendDatagram( &Packet
, NCE
, UDPSendPacketComplete
, NULL
)))
234 FreeNdisPacket(Packet
.NdisPacket
);
238 return STATUS_SUCCESS
;
242 VOID
UDPReceive(PIP_INTERFACE Interface
, PIP_PACKET IPPacket
)
244 * FUNCTION: Receives and queues a UDP datagram
246 * NTE = Pointer to net table entry which the packet was received on
247 * IPPacket = Pointer to an IP packet that was received
249 * This is the low level interface for receiving UDP datagrams. It strips
250 * the UDP header from a packet and delivers the data to anyone that wants it
253 AF_SEARCH SearchContext
;
254 PIPv4_HEADER IPv4Header
;
255 PADDRESS_FILE AddrFile
;
256 PUDP_HEADER UDPHeader
;
257 PIP_ADDRESS DstAddress
, SrcAddress
;
260 TI_DbgPrint(MAX_TRACE
, ("Called.\n"));
262 switch (IPPacket
->Type
) {
265 IPv4Header
= IPPacket
->Header
;
266 DstAddress
= &IPPacket
->DstAddr
;
267 SrcAddress
= &IPPacket
->SrcAddr
;
272 TI_DbgPrint(MIN_TRACE
, ("Discarded IPv6 UDP datagram (%i bytes).\n", IPPacket
->TotalSize
));
274 /* FIXME: IPv6 is not supported */
281 UDPHeader
= (PUDP_HEADER
)IPPacket
->Data
;
283 /* Calculate and validate UDP checksum */
284 i
= UDPv4ChecksumCalculate(IPv4Header
,
286 WH2N(UDPHeader
->Length
));
287 if (i
!= DH2N(0x0000FFFF) && UDPHeader
->Checksum
!= 0)
289 TI_DbgPrint(MIN_TRACE
, ("Bad checksum on packet received.\n"));
294 i
= WH2N(UDPHeader
->Length
);
295 if ((i
< sizeof(UDP_HEADER
)) || (i
> IPPacket
->TotalSize
- IPPacket
->Position
)) {
296 /* Incorrect or damaged packet received, discard it */
297 TI_DbgPrint(MIN_TRACE
, ("Incorrect or damaged UDP packet received.\n"));
301 DataSize
= i
- sizeof(UDP_HEADER
);
303 /* Go to UDP data area */
304 IPPacket
->Data
= (PVOID
)((ULONG_PTR
)IPPacket
->Data
+ sizeof(UDP_HEADER
));
306 /* Locate a receive request on destination address file object
307 and deliver the packet if one is found. If there is no receive
308 request on the address file object, call the associated receive
309 handler. If no receive handler is registered, drop the packet */
311 AddrFile
= AddrSearchFirst(DstAddress
,
317 DGDeliverData(AddrFile
,
320 UDPHeader
->SourcePort
,
324 } while ((AddrFile
= AddrSearchNext(&SearchContext
)) != NULL
);
326 /* There are no open address files that will take this datagram */
327 /* FIXME: IPv4 only */
328 TI_DbgPrint(MID_TRACE
, ("Cannot deliver IPv4 UDP datagram to address (0x%X).\n",
329 DN2H(DstAddress
->Address
.IPv4Address
)));
331 /* FIXME: Send ICMP reply */
333 TI_DbgPrint(MAX_TRACE
, ("Leaving.\n"));
340 * FUNCTION: Initializes the UDP subsystem
342 * Status of operation
348 RtlZeroMemory(&UDPStats
, sizeof(UDP_STATISTICS
));
351 Status
= PortsStartup( &UDPPorts
, 1, UDP_STARTING_PORT
+ UDP_DYNAMIC_PORTS
);
353 if( !NT_SUCCESS(Status
) ) return Status
;
355 /* Register this protocol with IP layer */
356 IPRegisterProtocol(IPPROTO_UDP
, UDPReceive
);
358 UDPInitialized
= TRUE
;
360 return STATUS_SUCCESS
;
364 NTSTATUS
UDPShutdown(
367 * FUNCTION: Shuts down the UDP subsystem
369 * Status of operation
373 return STATUS_SUCCESS
;
375 PortsShutdown( &UDPPorts
);
377 /* Deregister this protocol with IP layer */
378 IPRegisterProtocol(IPPROTO_UDP
, NULL
);
380 UDPInitialized
= FALSE
;
382 return STATUS_SUCCESS
;
385 UINT
UDPAllocatePort( UINT HintPort
) {
387 if( AllocatePort( &UDPPorts
, HintPort
) ) return HintPort
;
388 else return (UINT
)-1;
389 } else return AllocatePortFromRange
390 ( &UDPPorts
, UDP_STARTING_PORT
,
391 UDP_STARTING_PORT
+ UDP_DYNAMIC_PORTS
);
394 VOID
UDPFreePort( UINT Port
) {
395 DeallocatePort( &UDPPorts
, Port
);