icmp.c File Reference

#include "precomp.h"
#include <icmp.h>

Include dependency graph for icmp.c:

Go to the source code of this file.

Functions
NTSTATUS	ICMPStartup ()
NTSTATUS	ICMPShutdown ()
NTSTATUS	ICMPSendDatagram (PADDRESS_FILE AddrFile, PTDI_CONNECTION_INFORMATION ConnInfo, PCHAR BufferData, ULONG DataSize, PULONG DataUsed)
VOID	ICMPReceive (PIP_INTERFACE Interface, PIP_PACKET IPPacket)
VOID	ICMPReply (PIP_INTERFACE Interface, PIP_PACKET IPPacket, UCHAR Type, UCHAR Code)

Function Documentation

ICMPReceive()

VOID ICMPReceive	(	PIP_INTERFACE	Interface,
		PIP_PACKET	IPPacket
	)

Definition at line 53 of file icmp.c.

{
    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);
    }
}

Referenced by ICMPStartup().

ICMPReply()

VOID ICMPReply	(	PIP_INTERFACE	Interface,
		PIP_PACKET	IPPacket,
		UCHAR	Type,
		UCHAR	Code
	)

Definition at line 91 of file icmp.c.

{
    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);
}

Referenced by ICMPReceive().

ICMPSendDatagram()

NTSTATUS ICMPSendDatagram	(	PADDRESS_FILE	AddrFile,
		PTDI_CONNECTION_INFORMATION	ConnInfo,
		PCHAR	BufferData,
		ULONG	DataSize,
		PULONG	DataUsed
	)

Definition at line 29 of file icmp.c.

{
    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);
}

Referenced by FileOpenAddress().

ICMPShutdown()

NTSTATUS ICMPShutdown

(

)

Definition at line 22 of file icmp.c.

{
    IPRegisterProtocol(IPPROTO_ICMP, NULL);
 
    return STATUS_SUCCESS;
}

Referenced by TiUnload().

ICMPStartup()

NTSTATUS ICMPStartup

(

)

Definition at line 15 of file icmp.c.

{
    IPRegisterProtocol(IPPROTO_ICMP, ICMPReceive);
 
    return STATUS_SUCCESS;
}

Referenced by DriverEntry().