2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS TCP/IP protocol driver
5 * PURPOSE: Internet Control Message Protocol routines
6 * PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
8 * CSH 01/08-2000 Created
19 VOID SendICMPComplete(
22 NDIS_STATUS NdisStatus)
24 * FUNCTION: ICMP datagram transmit completion handler
26 * Context = Pointer to context infomation (IP_PACKET)
27 * Packet = Pointer to NDIS packet
28 * NdisStatus = Status of transmit operation
30 * This routine is called by IP when a ICMP send completes
33 PIP_PACKET IPPacket = (PIP_PACKET)Context;
35 TI_DbgPrint(DEBUG_ICMP, ("Freeing NDIS packet (%X).\n", Packet));
38 FreeNdisPacket(Packet);
40 TI_DbgPrint(DEBUG_ICMP, ("Freeing IP packet at %X.\n", IPPacket));
42 (*IPPacket->Free)(IPPacket);
46 PIP_PACKET PrepareICMPPacket(
48 PIP_ADDRESS Destination,
51 * FUNCTION: Prepares an ICMP packet
53 * NTE = Pointer to net table entry to use
54 * Destination = Pointer to destination address
55 * DataSize = Size of dataarea
57 * Pointer to IP packet, NULL if there is not enough free resources
61 PNDIS_PACKET NdisPacket;
62 PNDIS_BUFFER NdisBuffer;
63 NDIS_STATUS NdisStatus;
64 PIPv4_HEADER IPHeader;
68 TI_DbgPrint(DEBUG_ICMP, ("Called. DataSize (%d).\n", DataSize));
70 /* Prepare ICMP packet */
72 /* FIXME: Assumes IPv4*/
73 IPPacket = IPCreatePacket(IP_ADDRESS_V4);
77 /* No special flags */
80 Size = MaxLLHeaderSize + sizeof(IPv4_HEADER) +
81 sizeof(ICMP_HEADER) + DataSize;
82 DataBuffer = ExAllocatePool(NonPagedPool, Size);
84 (*IPPacket->Free)(IPPacket);
88 TI_DbgPrint(DEBUG_ICMP, ("Size (%d). Data at (0x%X).\n", Size, DataBuffer));
90 /* Allocate NDIS packet */
91 NdisAllocatePacket(&NdisStatus, &NdisPacket, GlobalPacketPool);
92 if (NdisStatus != NDIS_STATUS_SUCCESS) {
93 (*IPPacket->Free)(IPPacket);
94 ExFreePool(DataBuffer);
98 TI_DbgPrint(MAX_TRACE, ("NdisPacket at (0x%X).\n", NdisPacket));
100 /* Allocate NDIS buffer for maximum link level header and ICMP packet */
101 NdisAllocateBuffer(&NdisStatus, &NdisBuffer, GlobalBufferPool,
103 if (NdisStatus != NDIS_STATUS_SUCCESS) {
104 (*IPPacket->Free)(IPPacket);
105 NdisFreePacket(NdisPacket);
106 ExFreePool(DataBuffer);
110 TI_DbgPrint(MAX_TRACE, ("NdisBuffer at (0x%X).\n", NdisBuffer));
112 /* Link NDIS buffer into packet */
113 NdisChainBufferAtFront(NdisPacket, NdisBuffer);
114 IPPacket->NdisPacket = NdisPacket;
115 IPPacket->Header = (PVOID)((ULONG_PTR)DataBuffer + MaxLLHeaderSize);
116 IPPacket->Data = (PVOID)((ULONG_PTR)DataBuffer + MaxLLHeaderSize + sizeof(IPv4_HEADER));
118 IPPacket->HeaderSize = sizeof(IPv4_HEADER);
119 IPPacket->TotalSize = Size - MaxLLHeaderSize;
120 RtlCopyMemory(&IPPacket->DstAddr, Destination, sizeof(IP_ADDRESS));
122 /* Build IPv4 header. FIXME: IPv4 only */
124 IPHeader = (PIPv4_HEADER)IPPacket->Header;
126 /* Version = 4, Length = 5 DWORDs */
127 IPHeader->VerIHL = 0x45;
128 /* Normal Type-of-Service */
130 /* Length of data and header */
131 IPHeader->TotalLength = WH2N((USHORT)DataSize +
132 sizeof(IPv4_HEADER) + sizeof(ICMP_HEADER));
134 IPHeader->Id = (USHORT)Random();
135 /* One fragment at offset 0 */
136 IPHeader->FlagsFragOfs = 0;
137 /* Time-to-Live is 128 */
139 /* Internet Control Message Protocol */
140 IPHeader->Protocol = IPPROTO_ICMP;
141 /* Checksum is 0 (for later calculation of this) */
142 IPHeader->Checksum = 0;
144 IPHeader->SrcAddr = NTE->Address->Address.IPv4Address;
145 /* Destination address */
146 IPHeader->DstAddr = Destination->Address.IPv4Address;
148 /* Completion handler */
149 PC(NdisPacket)->Complete = SendICMPComplete;
150 PC(NdisPacket)->Context = IPPacket;
157 PNET_TABLE_ENTRY NTE,
160 * FUNCTION: Receives an ICMP packet
162 * NTE = Pointer to net table entry which the packet was received on
163 * IPPacket = Pointer to an IP packet that was received
166 PICMP_HEADER ICMPHeader;
167 PIP_PACKET NewPacket;
170 TI_DbgPrint(DEBUG_ICMP, ("Called.\n"));
172 ICMPHeader = (PICMP_HEADER)IPPacket->Data;
174 TI_DbgPrint(DEBUG_ICMP, ("Size (%d).\n", IPPacket->TotalSize));
176 TI_DbgPrint(DEBUG_ICMP, ("HeaderSize (%d).\n", IPPacket->HeaderSize));
178 TI_DbgPrint(DEBUG_ICMP, ("Type (%d).\n", ICMPHeader->Type));
180 TI_DbgPrint(DEBUG_ICMP, ("Code (%d).\n", ICMPHeader->Code));
182 TI_DbgPrint(DEBUG_ICMP, ("Checksum (0x%X).\n", ICMPHeader->Checksum));
184 /* Checksum ICMP header and data */
185 if (!CorrectChecksum(IPPacket->Data, IPPacket->TotalSize - IPPacket->HeaderSize)) {
186 TI_DbgPrint(DEBUG_ICMP, ("Bad ICMP checksum.\n"));
191 switch (ICMPHeader->Type) {
192 case ICMP_TYPE_ECHO_REQUEST:
193 /* Reply with an ICMP echo reply message */
194 DataSize = IPPacket->TotalSize - IPPacket->HeaderSize - sizeof(ICMP_HEADER);
195 NewPacket = PrepareICMPPacket(NTE, &IPPacket->SrcAddr, DataSize);
199 /* Copy ICMP header and data into new packet */
200 RtlCopyMemory(NewPacket->Data, IPPacket->Data, DataSize + sizeof(ICMP_HEADER));
201 ((PICMP_HEADER)NewPacket->Data)->Type = ICMP_TYPE_ECHO_REPLY;
202 ((PICMP_HEADER)NewPacket->Data)->Code = 0;
203 ((PICMP_HEADER)NewPacket->Data)->Checksum = 0;
205 DisplayIPPacket(IPPacket);
207 DisplayIPPacket(NewPacket);
209 ICMPTransmit(NTE, NewPacket);
211 TI_DbgPrint(DEBUG_ICMP, ("Echo reply sent.\n"));
214 case ICMP_TYPE_ECHO_REPLY:
218 TI_DbgPrint(DEBUG_ICMP, ("Discarded ICMP datagram of unknown type %d.\n",
224 /* Send datagram up the protocol stack */
225 RawIPReceive(NTE, IPPacket);
230 PNET_TABLE_ENTRY NTE,
233 * FUNCTION: Transmits an ICMP packet
235 * NTE = Pointer to net table entry to use (NULL if don't care)
236 * IPPacket = Pointer to IP packet to transmit
239 PROUTE_CACHE_NODE RCN;
241 TI_DbgPrint(DEBUG_ICMP, ("Called.\n"));
243 /* Calculate checksum of ICMP header and data */
244 ((PICMP_HEADER)IPPacket->Data)->Checksum = (USHORT)
245 IPv4Checksum(IPPacket->Data, IPPacket->TotalSize - IPPacket->HeaderSize, 0);
247 /* Get a route to the destination address */
248 if (RouteGetRouteToDestination(&IPPacket->DstAddr, NTE, &RCN) == IP_SUCCESS) {
249 /* Send the packet */
250 if (IPSendDatagram(IPPacket, RCN) != STATUS_SUCCESS) {
251 FreeNdisPacket(IPPacket->NdisPacket);
252 (*IPPacket->Free)(IPPacket);
254 /* We're done with the RCN */
255 DereferenceObject(RCN);
257 TI_DbgPrint(MIN_TRACE, ("RCN at (0x%X).\n", RCN));
259 /* No route to destination (or no free resources) */
260 TI_DbgPrint(DEBUG_ICMP, ("No route to destination address 0x%X.\n",
261 IPPacket->DstAddr.Address.IPv4Address));
263 FreeNdisPacket(IPPacket->NdisPacket);
264 (*IPPacket->Free)(IPPacket);
270 PNET_TABLE_ENTRY NTE,
275 * FUNCTION: Transmits an ICMP packet in response to an incoming packet
277 * NTE = Pointer to net table entry to use
278 * IPPacket = Pointer to IP packet that was received
279 * Type = ICMP message type
280 * Code = ICMP message code
282 * We have received a packet from someone and is unable to
283 * process it due to error(s) in the packet or we have run out
284 * of resources. We transmit an ICMP message to the host to
285 * notify him of the problem
289 PIP_PACKET NewPacket;
291 TI_DbgPrint(DEBUG_ICMP, ("Called. Type (%d) Code (%d).\n", Type, Code));
293 DataSize = IPPacket->TotalSize;
294 if ((DataSize) > (576 - sizeof(IPv4_HEADER) - sizeof(ICMP_HEADER)))
297 NewPacket = PrepareICMPPacket(NTE, &IPPacket->SrcAddr, DataSize);
301 RtlCopyMemory((PVOID)((ULONG_PTR)NewPacket->Data + sizeof(ICMP_HEADER)),
302 IPPacket->Header, DataSize);
303 ((PICMP_HEADER)NewPacket->Data)->Type = Type;
304 ((PICMP_HEADER)NewPacket->Data)->Code = Code;
305 ((PICMP_HEADER)NewPacket->Data)->Checksum = 0;
307 ICMPTransmit(NTE, NewPacket);