/* $Id: VBoxNetUDP.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */ /** @file * VBoxNetUDP - IntNet UDP Client Routines. */ /* * Copyright (C) 2009-2020 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 #include #include #include #include #include /** * 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); }