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145 lines
4 KiB
C
145 lines
4 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS TCP/IP protocol driver
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* FILE: network/icmp.c
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* PURPOSE: Internet Control Message Protocol routines
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* PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
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* REVISIONS:
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* CSH 01/08-2000 Created
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*/
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#include "precomp.h"
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#include <icmp.h>
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NTSTATUS ICMPStartup()
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{
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IPRegisterProtocol(IPPROTO_ICMP, ICMPReceive);
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return STATUS_SUCCESS;
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}
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NTSTATUS ICMPShutdown()
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{
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IPRegisterProtocol(IPPROTO_ICMP, NULL);
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return STATUS_SUCCESS;
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}
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NTSTATUS ICMPSendDatagram(
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PADDRESS_FILE AddrFile,
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PTDI_CONNECTION_INFORMATION ConnInfo,
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PCHAR BufferData,
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ULONG DataSize,
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PULONG DataUsed )
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/*
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* FUNCTION: Sends an ICMP datagram to a remote address
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* ARGUMENTS:
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* Request = Pointer to TDI request
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* ConnInfo = Pointer to connection information
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* Buffer = Pointer to NDIS buffer with data
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* DataSize = Size in bytes of data to be sent
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* RETURNS:
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* Status of operation
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*/
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{
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TI_DbgPrint(DEBUG_ICMP, ("Sending ICMP datagram (0x%x)\n", AddrFile));
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/* just forward the call to RawIP handler */
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return RawIPSendDatagram(AddrFile, ConnInfo, BufferData, DataSize, DataUsed);
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}
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VOID ICMPReceive(
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PIP_INTERFACE Interface,
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PIP_PACKET IPPacket)
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/*
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* FUNCTION: Receives an ICMP packet
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* ARGUMENTS:
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* NTE = Pointer to net table entry which the packet was received on
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* IPPacket = Pointer to an IP packet that was received
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*/
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{
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PICMP_HEADER ICMPHeader = (PICMP_HEADER)IPPacket->Data;
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UINT32 DataSize = IPPacket->TotalSize - IPPacket->HeaderSize;
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TI_DbgPrint(DEBUG_ICMP, ("ICMPReceive: Size (%d) HeaderSize (%d) Type (%d) Code (%d) Checksum (0x%x)\n",
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IPPacket->TotalSize, IPPacket->HeaderSize, ICMPHeader->Type, ICMPHeader->Code, ICMPHeader->Checksum));
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/* Discard too short packets */
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if (DataSize < sizeof(ICMP_HEADER))
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{
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TI_DbgPrint(DEBUG_ICMP, ("Packet doesn't fit ICMP header. Discarded\n"));
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return;
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}
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/* Discard packets with bad checksum */
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if (!IPv4CorrectChecksum(IPPacket->Data, DataSize))
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{
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TI_DbgPrint(DEBUG_ICMP, ("Bad ICMP checksum. Packet discarded\n"));
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return;
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}
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RawIpReceive(Interface, IPPacket);
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if (ICMPHeader->Type == ICMP_TYPE_ECHO_REQUEST)
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{
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ICMPReply(Interface, IPPacket, ICMP_TYPE_ECHO_REPLY, 0);
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}
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}
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VOID ICMPReply(
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PIP_INTERFACE Interface,
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PIP_PACKET IPPacket,
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UCHAR Type,
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UCHAR Code)
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/*
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* FUNCTION: Transmits an ICMP packet in response to an incoming packet
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* ARGUMENTS:
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* NTE = Pointer to net table entry to use
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* IPPacket = Pointer to IP packet that was received
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* Type = ICMP message type
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* Code = ICMP message code
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* NOTES:
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* We have received a packet from someone and is unable to
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* process it due to error(s) in the packet or we have run out
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* of resources. We transmit an ICMP message to the host to
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* notify him of the problem
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*/
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{
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UINT DataSize;
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IP_PACKET NewPacket;
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ADDRESS_FILE FakeAddrFile;
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PNEIGHBOR_CACHE_ENTRY NCE;
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TI_DbgPrint(DEBUG_ICMP, ("Called. Type (%d) Code (%d).\n", Type, Code));
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DataSize = IPPacket->TotalSize - IPPacket->HeaderSize;
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/* First check if we have a route to sender */
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NCE = RouteGetRouteToDestination(&IPPacket->SrcAddr);
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if (!NCE)
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{
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return;
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}
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/* This is the only data needed to generate a packet */
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FakeAddrFile.Protocol = IPPROTO_ICMP;
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FakeAddrFile.TTL = 128;
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if (!NT_SUCCESS(BuildRawIpPacket(
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&FakeAddrFile, &NewPacket, &IPPacket->SrcAddr, 0, &Interface->Unicast, 0, IPPacket->Data, DataSize)))
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{
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return;
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}
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((PICMP_HEADER)NewPacket.Data)->Type = Type;
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((PICMP_HEADER)NewPacket.Data)->Code = Code;
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((PICMP_HEADER)NewPacket.Data)->Checksum = 0;
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((PICMP_HEADER)NewPacket.Data)->Checksum = (USHORT)IPv4Checksum(NewPacket.Data, DataSize, 0);
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IPSendDatagram(&NewPacket, NCE);
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}
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/* EOF */
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