diff options
Diffstat (limited to 'src/VBox/NetworkServices/NetLib/VBoxNetUDP.cpp')
| -rw-r--r-- | src/VBox/NetworkServices/NetLib/VBoxNetUDP.cpp | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/src/VBox/NetworkServices/NetLib/VBoxNetUDP.cpp b/src/VBox/NetworkServices/NetLib/VBoxNetUDP.cpp new file mode 100644 index 00000000..4e565330 --- /dev/null +++ b/src/VBox/NetworkServices/NetLib/VBoxNetUDP.cpp @@ -0,0 +1,314 @@ +/* $Id: VBoxNetUDP.cpp $ */ +/** @file + * VBoxNetUDP - IntNet UDP Client Routines. + */ + +/* + * Copyright (C) 2009-2022 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); +} + |