mirror of
https://github.com/reactos/reactos.git
synced 2025-01-05 22:12:46 +00:00
144 lines
4 KiB
C
144 lines
4 KiB
C
/*
|
|
* COPYRIGHT: See COPYING in the top level directory
|
|
* PROJECT: ReactOS TCP/IP protocol driver
|
|
* FILE: network/icmp.c
|
|
* PURPOSE: Internet Control Message Protocol routines
|
|
* PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
|
|
* REVISIONS:
|
|
* CSH 01/08-2000 Created
|
|
*/
|
|
|
|
#include "precomp.h"
|
|
|
|
#include <icmp.h>
|
|
|
|
NTSTATUS ICMPStartup()
|
|
{
|
|
IPRegisterProtocol(IPPROTO_ICMP, ICMPReceive);
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
NTSTATUS ICMPShutdown()
|
|
{
|
|
IPRegisterProtocol(IPPROTO_ICMP, NULL);
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
NTSTATUS ICMPSendDatagram(
|
|
PADDRESS_FILE AddrFile,
|
|
PTDI_CONNECTION_INFORMATION ConnInfo,
|
|
PCHAR BufferData,
|
|
ULONG DataSize,
|
|
PULONG DataUsed )
|
|
/*
|
|
* FUNCTION: Sends an ICMP datagram to a remote address
|
|
* ARGUMENTS:
|
|
* Request = Pointer to TDI request
|
|
* ConnInfo = Pointer to connection information
|
|
* Buffer = Pointer to NDIS buffer with data
|
|
* DataSize = Size in bytes of data to be sent
|
|
* RETURNS:
|
|
* Status of operation
|
|
*/
|
|
{
|
|
TI_DbgPrint(DEBUG_ICMP, ("Sending ICMP datagram (0x%x)\n", AddrFile));
|
|
|
|
/* just forward the call to RawIP handler */
|
|
return RawIPSendDatagram(AddrFile, ConnInfo, BufferData, DataSize, DataUsed);
|
|
}
|
|
|
|
|
|
VOID ICMPReceive(
|
|
PIP_INTERFACE Interface,
|
|
PIP_PACKET IPPacket)
|
|
/*
|
|
* FUNCTION: Receives an ICMP packet
|
|
* ARGUMENTS:
|
|
* NTE = Pointer to net table entry which the packet was received on
|
|
* IPPacket = Pointer to an IP packet that was received
|
|
*/
|
|
{
|
|
PICMP_HEADER ICMPHeader = (PICMP_HEADER)IPPacket->Data;
|
|
UINT32 DataSize = IPPacket->TotalSize - IPPacket->HeaderSize;
|
|
|
|
TI_DbgPrint(DEBUG_ICMP, ("ICMPReceive: Size (%d) HeaderSize (%d) Type (%d) Code (%d) Checksum (0x%x)\n",
|
|
IPPacket->TotalSize, IPPacket->HeaderSize, ICMPHeader->Type, ICMPHeader->Code, ICMPHeader->Checksum));
|
|
|
|
/* Discard too short packets */
|
|
if (DataSize < sizeof(ICMP_HEADER))
|
|
{
|
|
TI_DbgPrint(DEBUG_ICMP, ("Packet doesn't fit ICMP header. Discarded\n"));
|
|
return;
|
|
}
|
|
|
|
/* Discard packets with bad checksum */
|
|
if (!IPv4CorrectChecksum(IPPacket->Data, DataSize))
|
|
{
|
|
TI_DbgPrint(DEBUG_ICMP, ("Bad ICMP checksum. Packet discarded\n"));
|
|
return;
|
|
}
|
|
|
|
RawIpReceive(Interface, IPPacket);
|
|
|
|
if (ICMPHeader->Type == ICMP_TYPE_ECHO_REQUEST)
|
|
{
|
|
ICMPReply(Interface, IPPacket, ICMP_TYPE_ECHO_REPLY, 0);
|
|
}
|
|
}
|
|
|
|
VOID ICMPReply(
|
|
PIP_INTERFACE Interface,
|
|
PIP_PACKET IPPacket,
|
|
UCHAR Type,
|
|
UCHAR Code)
|
|
/*
|
|
* FUNCTION: Transmits an ICMP packet in response to an incoming packet
|
|
* ARGUMENTS:
|
|
* NTE = Pointer to net table entry to use
|
|
* IPPacket = Pointer to IP packet that was received
|
|
* Type = ICMP message type
|
|
* Code = ICMP message code
|
|
* NOTES:
|
|
* We have received a packet from someone and is unable to
|
|
* process it due to error(s) in the packet or we have run out
|
|
* of resources. We transmit an ICMP message to the host to
|
|
* notify him of the problem
|
|
*/
|
|
{
|
|
UINT DataSize;
|
|
IP_PACKET NewPacket;
|
|
ADDRESS_FILE FakeAddrFile;
|
|
PNEIGHBOR_CACHE_ENTRY NCE;
|
|
|
|
TI_DbgPrint(DEBUG_ICMP, ("Called. Type (%d) Code (%d).\n", Type, Code));
|
|
|
|
DataSize = IPPacket->TotalSize - IPPacket->HeaderSize;
|
|
|
|
/* First check if we have a route to sender */
|
|
NCE = RouteGetRouteToDestination(&IPPacket->SrcAddr);
|
|
if (!NCE)
|
|
{
|
|
return;
|
|
}
|
|
|
|
/* This is the only data needed to generate a packet */
|
|
FakeAddrFile.Protocol = IPPROTO_ICMP;
|
|
FakeAddrFile.TTL = 128;
|
|
|
|
if (!NT_SUCCESS(BuildRawIpPacket(
|
|
&FakeAddrFile, &NewPacket, &IPPacket->SrcAddr, 0, &Interface->Unicast, 0, IPPacket->Data, DataSize)))
|
|
{
|
|
return;
|
|
}
|
|
|
|
((PICMP_HEADER)NewPacket.Data)->Type = Type;
|
|
((PICMP_HEADER)NewPacket.Data)->Code = Code;
|
|
((PICMP_HEADER)NewPacket.Data)->Checksum = 0;
|
|
((PICMP_HEADER)NewPacket.Data)->Checksum = (USHORT)IPv4Checksum(NewPacket.Data, DataSize, 0);
|
|
|
|
IPSendDatagram(&NewPacket, NCE);
|
|
}
|
|
|
|
/* EOF */
|