VBoxNetARP.cpp revision 3c086cee27d5216042cc045c009537485c0339b5
/* $Id$ */
/** @file
* VBoxNetARP - IntNet ARP Client Routines.
*/
/*
* Copyright (C) 2009-2010 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP LOG_GROUP_DEFAULT
#include "VBoxNetLib.h"
#include <iprt/string.h>
#include <VBox/intnetinline.h>
#include <VBox/log.h>
/**
* Deal with ARP queries.
*
* @returns true if ARP.
*
* @param pSession The support driver session.
* @param hIf The internal network interface handle.
* @param pBuf The internal network interface buffer.
* @param pMacAddr Our MAC address.
* @param IPv4Addr Our IPv4 address.
*/
bool VBoxNetArpHandleIt(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf, PCRTMAC pMacAddr, RTNETADDRIPV4 IPv4Addr)
{
/*
* Valid IntNet Ethernet frame? Skip GSO, no ARP in there.
*/
PCINTNETHDR pHdr = IntNetRingGetNextFrameToRead(&pBuf->Recv);
if ( !pHdr
|| pHdr->u8Type != INTNETHDR_TYPE_FRAME)
return false;
size_t cbFrame = pHdr->cbFrame;
const void *pvFrame = IntNetHdrGetFramePtr(pHdr, pBuf);
PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame;
/*
* Arp frame?
*/
if (pEthHdr->EtherType != RT_H2N_U16_C(RTNET_ETHERTYPE_ARP))
return false;
if ( ( pEthHdr->DstMac.au16[0] != 0xffff
|| pEthHdr->DstMac.au16[1] != 0xffff
|| pEthHdr->DstMac.au16[2] != 0xffff)
&& ( pEthHdr->DstMac.au16[0] != pMacAddr->au16[0]
|| pEthHdr->DstMac.au16[1] != pMacAddr->au16[1]
|| pEthHdr->DstMac.au16[2] != pMacAddr->au16[2])
)
return false;
if (cbFrame < sizeof(RTNETARPIPV4) + sizeof(RTNETETHERHDR))
return false;
PCRTNETARPHDR pArpHdr = (PCRTNETARPHDR)(pEthHdr + 1);
if (pArpHdr->ar_htype != RT_H2N_U16_C(RTNET_ARP_ETHER))
return false;
if (pArpHdr->ar_hlen != sizeof(RTMAC))
return false;
if (pArpHdr->ar_ptype != RT_H2N_U16_C(RTNET_ETHERTYPE_IPV4))
return false;
if (pArpHdr->ar_plen != sizeof(RTNETADDRIPV4))
return false;
/* It's ARP, alright. Anything we need to do something about. */
PCRTNETARPIPV4 pArp = (PCRTNETARPIPV4)pArpHdr;
switch (pArp->Hdr.ar_oper)
{
case RT_H2N_U16_C(RTNET_ARPOP_REQUEST):
case RT_H2N_U16_C(RTNET_ARPOP_REVREQUEST):
case RT_H2N_U16_C(RTNET_ARPOP_INVREQUEST):
break;
default:
return true;
}
/*
* Deal with the queries.
*/
RTNETARPIPV4 Reply;
switch (pArp->Hdr.ar_oper)
{
/* 'Who has ar_tpa? Tell ar_spa.' */
case RT_H2N_U16_C(RTNET_ARPOP_REQUEST):
if (pArp->ar_tpa.u != IPv4Addr.u)
return true;
Reply.Hdr.ar_oper = RT_H2N_U16_C(RTNET_ARPOP_REPLY);
break;
case RT_H2N_U16_C(RTNET_ARPOP_REVREQUEST):
if ( pArp->ar_tha.au16[0] != pMacAddr->au16[0]
|| pArp->ar_tha.au16[1] != pMacAddr->au16[1]
|| pArp->ar_tha.au16[2] != pMacAddr->au16[2])
return true;
Reply.Hdr.ar_oper = RT_H2N_U16_C(RTNET_ARPOP_REVREPLY);
break;
case RT_H2N_U16_C(RTNET_ARPOP_INVREQUEST):
/** @todo RTNET_ARPOP_INVREQUEST */
return true;
//Reply.Hdr.ar_oper = RT_H2N_U16_C(RTNET_ARPOP_INVREPLY);
//break;
}
/*
* Complete the reply and send it.
*/
Reply.Hdr.ar_htype = RT_H2N_U16_C(RTNET_ARP_ETHER);
Reply.Hdr.ar_ptype = RT_H2N_U16_C(RTNET_ETHERTYPE_IPV4);
Reply.Hdr.ar_hlen = sizeof(RTMAC);
Reply.Hdr.ar_plen = sizeof(RTNETADDRIPV4);
Reply.ar_sha = *pMacAddr;
Reply.ar_spa = IPv4Addr;
Reply.ar_tha = pArp->ar_sha;
Reply.ar_tpa = pArp->ar_spa;
RTNETETHERHDR EthHdr;
EthHdr.DstMac = pArp->ar_sha;
EthHdr.SrcMac = *pMacAddr;
EthHdr.EtherType = RT_H2N_U16_C(RTNET_ETHERTYPE_ARP);
uint8_t abTrailer[60 - sizeof(Reply) - sizeof(EthHdr)];
memset(abTrailer, '\0', sizeof(abTrailer));
INTNETSEG aSegs[3];
aSegs[0].cb = sizeof(EthHdr);
aSegs[0].pv = &EthHdr;
aSegs[1].pv = &Reply;
aSegs[1].cb = sizeof(Reply);
aSegs[2].pv = &abTrailer[0];
aSegs[2].cb = sizeof(abTrailer);
VBoxNetIntIfSend(pSession, hIf, pBuf, RT_ELEMENTS(aSegs), &aSegs[0], true /* fFlush */);
return true;
}