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/* $Id: VBoxNetUDP.cpp $ */
/** @file
* VBoxNetUDP - IntNet UDP Client Routines.
*/
/*
* Copyright (C) 2009-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_DEFAULT
#include "VBoxNetLib.h"
#include <iprt/stream.h>
#include <iprt/string.h>
#include <iprt/rand.h>
#include <VBox/log.h>
#include <VBox/vmm/pdmnetinline.h>
#include <VBox/intnetinline.h>
/**
* Checks if the head of the receive ring is a UDP packet matching the given
* criteria.
*
* @returns Pointer to the data if it matches.
* @param pBuf The IntNet buffers.
* @param uDstPort The destination port to match.
* @param pDstMac The destination address to match if
* VBOXNETUDP_MATCH_UNICAST is specied.
* @param fFlags Flags indicating what to match and some debug stuff.
* See VBOXNETUDP_MATCH_*.
* @param pHdrs Where to return the pointers to the headers.
* Optional.
* @param pcb Where to return the size of the data on success.
*/
void *VBoxNetUDPMatch(PINTNETBUF pBuf, unsigned uDstPort, PCRTMAC pDstMac, uint32_t fFlags, PVBOXNETUDPHDRS pHdrs, size_t *pcb)
{
/*
* Clear return values so we can return easier on mismatch.
*/
*pcb = 0;
if (pHdrs)
{
pHdrs->pEth = NULL;
pHdrs->pIpv4 = NULL;
pHdrs->pUdp = NULL;
}
/*
* Valid IntNet Ethernet frame?
*/
PCINTNETHDR pHdr = IntNetRingGetNextFrameToRead(&pBuf->Recv);
if ( !pHdr
|| ( pHdr->u8Type != INTNETHDR_TYPE_FRAME
&& pHdr->u8Type != INTNETHDR_TYPE_GSO))
return NULL;
size_t cbFrame = pHdr->cbFrame;
const void *pvFrame = IntNetHdrGetFramePtr(pHdr, pBuf);
PCPDMNETWORKGSO pGso = NULL;
if (pHdr->u8Type == INTNETHDR_TYPE_GSO)
{
pGso = (PCPDMNETWORKGSO)pvFrame;
if (!PDMNetGsoIsValid(pGso, cbFrame, cbFrame - sizeof(*pGso)))
return NULL;
/** @todo IPv6 UDP support, goes for this entire function really. Not really
* important yet since this is currently only used by the DHCP server. */
if (pGso->u8Type != PDMNETWORKGSOTYPE_IPV4_UDP)
return NULL;
pvFrame = pGso + 1;
cbFrame -= sizeof(*pGso);
}
PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame;
if (pHdrs)
pHdrs->pEth = pEthHdr;
#ifdef IN_RING3
/* Dump if to stderr/log if that's wanted. */
if (fFlags & VBOXNETUDP_MATCH_PRINT_STDERR)
{
RTStrmPrintf(g_pStdErr, "frame: cb=%04x dst=%.6Rhxs src=%.6Rhxs type=%04x%s\n",
cbFrame, &pEthHdr->DstMac, &pEthHdr->SrcMac, RT_BE2H_U16(pEthHdr->EtherType),
!memcmp(&pEthHdr->DstMac, pDstMac, sizeof(*pDstMac)) ? " Mine!" : "");
}
#endif
/*
* Ethernet matching.
*/
/* Ethernet min frame size. */
if (cbFrame < 64)
return NULL;
/* Match Ethertype: IPV4? */
/** @todo VLAN tagging? */
if (pEthHdr->EtherType != RT_H2BE_U16_C(RTNET_ETHERTYPE_IPV4))
return NULL;
/* Match destination address (ethernet) */
if ( ( !(fFlags & VBOXNETUDP_MATCH_UNICAST)
|| memcmp(&pEthHdr->DstMac, pDstMac, sizeof(pEthHdr->DstMac)))
&& ( !(fFlags & VBOXNETUDP_MATCH_BROADCAST)
|| pEthHdr->DstMac.au16[0] != 0xffff
|| pEthHdr->DstMac.au16[1] != 0xffff
|| pEthHdr->DstMac.au16[2] != 0xffff))
return NULL;
/*
* If we're working on a GSO frame, we need to make sure the length fields
* are set correctly (they are usually set to 0).
*/
if (pGso)
PDMNetGsoPrepForDirectUse(pGso, (void *)pvFrame, cbFrame, PDMNETCSUMTYPE_NONE);
/*
* IP validation and matching.
*/
PCRTNETIPV4 pIpHdr = (PCRTNETIPV4)(pEthHdr + 1);
if (pHdrs)
pHdrs->pIpv4 = pIpHdr;
/* Protocol: UDP */
if (pIpHdr->ip_p != RTNETIPV4_PROT_UDP)
return NULL;
/* Valid IPv4 header? */
size_t const offIpHdr = (uintptr_t)pIpHdr - (uintptr_t)pEthHdr;
if (!RTNetIPv4IsHdrValid(pIpHdr, cbFrame - offIpHdr, cbFrame - offIpHdr, !pGso /*fChecksum*/))
return NULL;
/*
* UDP matching and validation.
*/
PCRTNETUDP pUdpHdr = (PCRTNETUDP)((uint32_t *)pIpHdr + pIpHdr->ip_hl);
if (pHdrs)
pHdrs->pUdp = pUdpHdr;
/* Destination port */
if (RT_BE2H_U16(pUdpHdr->uh_dport) != uDstPort)
return NULL;
if (!pGso)
{
/* Validate the UDP header according to flags. */
size_t offUdpHdr = (uintptr_t)pUdpHdr - (uintptr_t)pEthHdr;
if (fFlags & (VBOXNETUDP_MATCH_CHECKSUM | VBOXNETUDP_MATCH_REQUIRE_CHECKSUM))
{
if (!RTNetIPv4IsUDPValid(pIpHdr, pUdpHdr, pUdpHdr + 1, cbFrame - offUdpHdr, true /*fChecksum*/))
return NULL;
if ( (fFlags & VBOXNETUDP_MATCH_REQUIRE_CHECKSUM)
&& !pUdpHdr->uh_sum)
return NULL;
}
else
{
if (!RTNetIPv4IsUDPSizeValid(pIpHdr, pUdpHdr, cbFrame - offUdpHdr))
return NULL;
}
}
/*
* We've got a match!
*/
*pcb = RT_N2H_U16(pUdpHdr->uh_ulen) - sizeof(*pUdpHdr);
return (void *)(pUdpHdr + 1);
}
/** Internal worker for VBoxNetUDPUnicast and VBoxNetUDPBroadcast. */
static int vboxnetudpSend(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
RTNETADDRIPV4 DstIPv4Addr, PCRTMAC pDstMacAddr, unsigned uDstPort,
void const *pvData, size_t cbData)
{
INTNETSEG aSegs[4];
/* the Ethernet header */
RTNETETHERHDR EtherHdr;
EtherHdr.DstMac = *pDstMacAddr;
EtherHdr.SrcMac = *pSrcMacAddr;
EtherHdr.EtherType = RT_H2BE_U16_C(RTNET_ETHERTYPE_IPV4);
aSegs[0].pv = &EtherHdr;
aSegs[0].cb = sizeof(EtherHdr);
aSegs[0].Phys = NIL_RTHCPHYS;
/* the IP header */
RTNETIPV4 IpHdr;
unsigned cbIdHdr = RT_UOFFSETOF(RTNETIPV4, ip_options);
IpHdr.ip_v = 4;
IpHdr.ip_hl = cbIdHdr >> 2;
IpHdr.ip_tos = 0;
IpHdr.ip_len = RT_H2BE_U16((uint16_t)(cbData + sizeof(RTNETUDP) + cbIdHdr));
IpHdr.ip_id = (uint16_t)RTRandU32();
IpHdr.ip_off = 0;
IpHdr.ip_ttl = 255;
IpHdr.ip_p = RTNETIPV4_PROT_UDP;
IpHdr.ip_sum = 0;
IpHdr.ip_src = SrcIPv4Addr;
IpHdr.ip_dst = DstIPv4Addr;
IpHdr.ip_sum = RTNetIPv4HdrChecksum(&IpHdr);
aSegs[1].pv = &IpHdr;
aSegs[1].cb = cbIdHdr;
aSegs[1].Phys = NIL_RTHCPHYS;
/* the UDP bit */
RTNETUDP UdpHdr;
UdpHdr.uh_sport = RT_H2BE_U16(uSrcPort);
UdpHdr.uh_dport = RT_H2BE_U16(uDstPort);
UdpHdr.uh_ulen = RT_H2BE_U16((uint16_t)(cbData + sizeof(RTNETUDP)));
#if 0
UdpHdr.uh_sum = 0; /* pretend checksumming is disabled */
#else
UdpHdr.uh_sum = RTNetIPv4UDPChecksum(&IpHdr, &UdpHdr, pvData);
#endif
aSegs[2].pv = &UdpHdr;
aSegs[2].cb = sizeof(UdpHdr);
aSegs[2].Phys = NIL_RTHCPHYS;
/* the payload */
aSegs[3].pv = (void *)pvData;
aSegs[3].cb = (uint32_t)cbData;
aSegs[3].Phys = NIL_RTHCPHYS;
/* send it */
return VBoxNetIntIfSend(pSession, hIf, pBuf, RT_ELEMENTS(aSegs), &aSegs[0], true /* fFlush */);
}
/**
* Sends an unicast UDP packet.
*
* @returns VBox status code.
* @param pSession The support driver session handle.
* @param hIf The interface handle.
* @param pBuf The interface buffer.
* @param SrcIPv4Addr The source IPv4 address.
* @param pSrcMacAddr The source MAC address.
* @param uSrcPort The source port number.
* @param DstIPv4Addr The destination IPv4 address. Can be broadcast.
* @param pDstMacAddr The destination MAC address.
* @param uDstPort The destination port number.
* @param pvData The data payload.
* @param cbData The size of the data payload.
*/
int VBoxNetUDPUnicast(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
RTNETADDRIPV4 DstIPv4Addr, PCRTMAC pDstMacAddr, unsigned uDstPort,
void const *pvData, size_t cbData)
{
return vboxnetudpSend(pSession, hIf, pBuf,
SrcIPv4Addr, pSrcMacAddr, uSrcPort,
DstIPv4Addr, pDstMacAddr, uDstPort,
pvData, cbData);
}
/**
* Sends a broadcast UDP packet.
*
* @returns VBox status code.
* @param pSession The support driver session handle.
* @param hIf The interface handle.
* @param pBuf The interface buffer.
* @param SrcIPv4Addr The source IPv4 address.
* @param pSrcMacAddr The source MAC address.
* @param uSrcPort The source port number.
* @param uDstPort The destination port number.
* @param pvData The data payload.
* @param cbData The size of the data payload.
*/
int VBoxNetUDPBroadcast(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
unsigned uDstPort,
void const *pvData, size_t cbData)
{
RTNETADDRIPV4 IPv4AddrBrdCast;
IPv4AddrBrdCast.u = UINT32_C(0xffffffff);
RTMAC MacBrdCast;
MacBrdCast.au16[0] = MacBrdCast.au16[1] = MacBrdCast.au16[2] = UINT16_C(0xffff);
return vboxnetudpSend(pSession, hIf, pBuf,
SrcIPv4Addr, pSrcMacAddr, uSrcPort,
IPv4AddrBrdCast, &MacBrdCast, uDstPort,
pvData, cbData);
}
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