| 1 | /* $Id: VBoxNetUDP.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxNetUDP - IntNet UDP Client Routines.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2009-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #define LOG_GROUP LOG_GROUP_DEFAULT
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| 33 | #include "VBoxNetLib.h"
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| 34 | #include <iprt/stream.h>
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| 35 | #include <iprt/string.h>
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| 36 | #include <iprt/rand.h>
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| 37 | #include <VBox/log.h>
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| 38 | #include <VBox/vmm/pdmnetinline.h>
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| 39 | #include <VBox/intnetinline.h>
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| 40 |
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| 41 |
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| 42 | /**
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| 43 | * Checks if the head of the receive ring is a UDP packet matching the given
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| 44 | * criteria.
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| 45 | *
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| 46 | * @returns Pointer to the data if it matches.
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| 47 | * @param pBuf The IntNet buffers.
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| 48 | * @param uDstPort The destination port to match.
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| 49 | * @param pDstMac The destination address to match if
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| 50 | * VBOXNETUDP_MATCH_UNICAST is specied.
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| 51 | * @param fFlags Flags indicating what to match and some debug stuff.
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| 52 | * See VBOXNETUDP_MATCH_*.
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| 53 | * @param pHdrs Where to return the pointers to the headers.
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| 54 | * Optional.
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| 55 | * @param pcb Where to return the size of the data on success.
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| 56 | */
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| 57 | void *VBoxNetUDPMatch(PINTNETBUF pBuf, unsigned uDstPort, PCRTMAC pDstMac, uint32_t fFlags, PVBOXNETUDPHDRS pHdrs, size_t *pcb)
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| 58 | {
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| 59 | /*
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| 60 | * Clear return values so we can return easier on mismatch.
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| 61 | */
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| 62 | *pcb = 0;
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| 63 | if (pHdrs)
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| 64 | {
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| 65 | pHdrs->pEth = NULL;
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| 66 | pHdrs->pIpv4 = NULL;
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| 67 | pHdrs->pUdp = NULL;
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| 68 | }
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| 69 |
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| 70 | /*
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| 71 | * Valid IntNet Ethernet frame?
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| 72 | */
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| 73 | PCINTNETHDR pHdr = IntNetRingGetNextFrameToRead(&pBuf->Recv);
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| 74 | if ( !pHdr
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| 75 | || ( pHdr->u8Type != INTNETHDR_TYPE_FRAME
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| 76 | && pHdr->u8Type != INTNETHDR_TYPE_GSO))
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| 77 | return NULL;
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| 78 |
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| 79 | size_t cbFrame = pHdr->cbFrame;
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| 80 | const void *pvFrame = IntNetHdrGetFramePtr(pHdr, pBuf);
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| 81 | PCPDMNETWORKGSO pGso = NULL;
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| 82 | if (pHdr->u8Type == INTNETHDR_TYPE_GSO)
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| 83 | {
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| 84 | pGso = (PCPDMNETWORKGSO)pvFrame;
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| 85 | if (!PDMNetGsoIsValid(pGso, cbFrame, cbFrame - sizeof(*pGso)))
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| 86 | return NULL;
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| 87 | /** @todo IPv6 UDP support, goes for this entire function really. Not really
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| 88 | * important yet since this is currently only used by the DHCP server. */
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| 89 | if (pGso->u8Type != PDMNETWORKGSOTYPE_IPV4_UDP)
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| 90 | return NULL;
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| 91 | pvFrame = pGso + 1;
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| 92 | cbFrame -= sizeof(*pGso);
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| 93 | }
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| 94 |
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| 95 | PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame;
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| 96 | if (pHdrs)
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| 97 | pHdrs->pEth = pEthHdr;
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| 98 |
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| 99 | #ifdef IN_RING3
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| 100 | /* Dump if to stderr/log if that's wanted. */
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| 101 | if (fFlags & VBOXNETUDP_MATCH_PRINT_STDERR)
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| 102 | {
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| 103 | RTStrmPrintf(g_pStdErr, "frame: cb=%04x dst=%.6Rhxs src=%.6Rhxs type=%04x%s\n",
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| 104 | cbFrame, &pEthHdr->DstMac, &pEthHdr->SrcMac, RT_BE2H_U16(pEthHdr->EtherType),
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| 105 | !memcmp(&pEthHdr->DstMac, pDstMac, sizeof(*pDstMac)) ? " Mine!" : "");
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| 106 | }
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| 107 | #endif
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| 108 |
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| 109 | /*
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| 110 | * Ethernet matching.
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| 111 | */
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| 112 |
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| 113 | /* Ethernet min frame size. */
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| 114 | if (cbFrame < 64)
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| 115 | return NULL;
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| 116 |
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| 117 | /* Match Ethertype: IPV4? */
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| 118 | /** @todo VLAN tagging? */
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| 119 | if (pEthHdr->EtherType != RT_H2BE_U16_C(RTNET_ETHERTYPE_IPV4))
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| 120 | return NULL;
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| 121 |
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| 122 | /* Match destination address (ethernet) */
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| 123 | if ( ( !(fFlags & VBOXNETUDP_MATCH_UNICAST)
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| 124 | || memcmp(&pEthHdr->DstMac, pDstMac, sizeof(pEthHdr->DstMac)))
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| 125 | && ( !(fFlags & VBOXNETUDP_MATCH_BROADCAST)
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| 126 | || pEthHdr->DstMac.au16[0] != 0xffff
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| 127 | || pEthHdr->DstMac.au16[1] != 0xffff
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| 128 | || pEthHdr->DstMac.au16[2] != 0xffff))
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| 129 | return NULL;
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| 130 |
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| 131 | /*
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| 132 | * If we're working on a GSO frame, we need to make sure the length fields
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| 133 | * are set correctly (they are usually set to 0).
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| 134 | */
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| 135 | if (pGso)
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| 136 | PDMNetGsoPrepForDirectUse(pGso, (void *)pvFrame, cbFrame, PDMNETCSUMTYPE_NONE);
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| 137 |
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| 138 | /*
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| 139 | * IP validation and matching.
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| 140 | */
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| 141 | PCRTNETIPV4 pIpHdr = (PCRTNETIPV4)(pEthHdr + 1);
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| 142 | if (pHdrs)
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| 143 | pHdrs->pIpv4 = pIpHdr;
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| 144 |
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| 145 | /* Protocol: UDP */
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| 146 | if (pIpHdr->ip_p != RTNETIPV4_PROT_UDP)
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| 147 | return NULL;
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| 148 |
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| 149 | /* Valid IPv4 header? */
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| 150 | size_t const offIpHdr = (uintptr_t)pIpHdr - (uintptr_t)pEthHdr;
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| 151 | if (!RTNetIPv4IsHdrValid(pIpHdr, cbFrame - offIpHdr, cbFrame - offIpHdr, !pGso /*fChecksum*/))
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| 152 | return NULL;
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| 153 |
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| 154 | /*
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| 155 | * UDP matching and validation.
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| 156 | */
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| 157 | PCRTNETUDP pUdpHdr = (PCRTNETUDP)((uint32_t *)pIpHdr + pIpHdr->ip_hl);
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| 158 | if (pHdrs)
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| 159 | pHdrs->pUdp = pUdpHdr;
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| 160 |
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| 161 | /* Destination port */
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| 162 | if (RT_BE2H_U16(pUdpHdr->uh_dport) != uDstPort)
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| 163 | return NULL;
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| 164 |
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| 165 | if (!pGso)
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| 166 | {
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| 167 | /* Validate the UDP header according to flags. */
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| 168 | size_t offUdpHdr = (uintptr_t)pUdpHdr - (uintptr_t)pEthHdr;
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| 169 | if (fFlags & (VBOXNETUDP_MATCH_CHECKSUM | VBOXNETUDP_MATCH_REQUIRE_CHECKSUM))
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| 170 | {
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| 171 | if (!RTNetIPv4IsUDPValid(pIpHdr, pUdpHdr, pUdpHdr + 1, cbFrame - offUdpHdr, true /*fChecksum*/))
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| 172 | return NULL;
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| 173 | if ( (fFlags & VBOXNETUDP_MATCH_REQUIRE_CHECKSUM)
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| 174 | && !pUdpHdr->uh_sum)
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| 175 | return NULL;
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| 176 | }
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| 177 | else
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| 178 | {
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| 179 | if (!RTNetIPv4IsUDPSizeValid(pIpHdr, pUdpHdr, cbFrame - offUdpHdr))
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| 180 | return NULL;
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| 181 | }
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| 182 | }
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| 183 |
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| 184 | /*
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| 185 | * We've got a match!
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| 186 | */
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| 187 | *pcb = RT_N2H_U16(pUdpHdr->uh_ulen) - sizeof(*pUdpHdr);
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| 188 | return (void *)(pUdpHdr + 1);
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| 189 | }
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| 190 |
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| 191 |
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| 192 | /** Internal worker for VBoxNetUDPUnicast and VBoxNetUDPBroadcast. */
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| 193 | static int vboxnetudpSend(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
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| 194 | RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
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| 195 | RTNETADDRIPV4 DstIPv4Addr, PCRTMAC pDstMacAddr, unsigned uDstPort,
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| 196 | void const *pvData, size_t cbData)
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| 197 | {
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| 198 | INTNETSEG aSegs[4];
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| 199 |
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| 200 | /* the Ethernet header */
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| 201 | RTNETETHERHDR EtherHdr;
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| 202 | EtherHdr.DstMac = *pDstMacAddr;
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| 203 | EtherHdr.SrcMac = *pSrcMacAddr;
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| 204 | EtherHdr.EtherType = RT_H2BE_U16_C(RTNET_ETHERTYPE_IPV4);
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| 205 |
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| 206 | aSegs[0].pv = &EtherHdr;
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| 207 | aSegs[0].cb = sizeof(EtherHdr);
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| 208 | aSegs[0].Phys = NIL_RTHCPHYS;
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| 209 |
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| 210 | /* the IP header */
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| 211 | RTNETIPV4 IpHdr;
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| 212 | unsigned cbIdHdr = RT_UOFFSETOF(RTNETIPV4, ip_options);
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| 213 | IpHdr.ip_v = 4;
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| 214 | IpHdr.ip_hl = cbIdHdr >> 2;
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| 215 | IpHdr.ip_tos = 0;
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| 216 | IpHdr.ip_len = RT_H2BE_U16((uint16_t)(cbData + sizeof(RTNETUDP) + cbIdHdr));
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| 217 | IpHdr.ip_id = (uint16_t)RTRandU32();
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| 218 | IpHdr.ip_off = 0;
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| 219 | IpHdr.ip_ttl = 255;
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| 220 | IpHdr.ip_p = RTNETIPV4_PROT_UDP;
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| 221 | IpHdr.ip_sum = 0;
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| 222 | IpHdr.ip_src = SrcIPv4Addr;
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| 223 | IpHdr.ip_dst = DstIPv4Addr;
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| 224 | IpHdr.ip_sum = RTNetIPv4HdrChecksum(&IpHdr);
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| 225 |
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| 226 | aSegs[1].pv = &IpHdr;
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| 227 | aSegs[1].cb = cbIdHdr;
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| 228 | aSegs[1].Phys = NIL_RTHCPHYS;
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| 229 |
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| 230 |
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| 231 | /* the UDP bit */
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| 232 | RTNETUDP UdpHdr;
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| 233 | UdpHdr.uh_sport = RT_H2BE_U16(uSrcPort);
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| 234 | UdpHdr.uh_dport = RT_H2BE_U16(uDstPort);
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| 235 | UdpHdr.uh_ulen = RT_H2BE_U16((uint16_t)(cbData + sizeof(RTNETUDP)));
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| 236 | #if 0
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| 237 | UdpHdr.uh_sum = 0; /* pretend checksumming is disabled */
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| 238 | #else
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| 239 | UdpHdr.uh_sum = RTNetIPv4UDPChecksum(&IpHdr, &UdpHdr, pvData);
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| 240 | #endif
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| 241 |
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| 242 | aSegs[2].pv = &UdpHdr;
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| 243 | aSegs[2].cb = sizeof(UdpHdr);
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| 244 | aSegs[2].Phys = NIL_RTHCPHYS;
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| 245 |
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| 246 | /* the payload */
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| 247 | aSegs[3].pv = (void *)pvData;
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| 248 | aSegs[3].cb = (uint32_t)cbData;
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| 249 | aSegs[3].Phys = NIL_RTHCPHYS;
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| 250 |
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| 251 |
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| 252 | /* send it */
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| 253 | return VBoxNetIntIfSend(pSession, hIf, pBuf, RT_ELEMENTS(aSegs), &aSegs[0], true /* fFlush */);
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| 254 | }
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| 255 |
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| 256 |
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| 257 | /**
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| 258 | * Sends an unicast UDP packet.
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| 259 | *
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| 260 | * @returns VBox status code.
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| 261 | * @param pSession The support driver session handle.
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| 262 | * @param hIf The interface handle.
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| 263 | * @param pBuf The interface buffer.
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| 264 | * @param SrcIPv4Addr The source IPv4 address.
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| 265 | * @param pSrcMacAddr The source MAC address.
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| 266 | * @param uSrcPort The source port number.
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| 267 | * @param DstIPv4Addr The destination IPv4 address. Can be broadcast.
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| 268 | * @param pDstMacAddr The destination MAC address.
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| 269 | * @param uDstPort The destination port number.
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| 270 | * @param pvData The data payload.
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| 271 | * @param cbData The size of the data payload.
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| 272 | */
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| 273 | int VBoxNetUDPUnicast(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
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| 274 | RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
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| 275 | RTNETADDRIPV4 DstIPv4Addr, PCRTMAC pDstMacAddr, unsigned uDstPort,
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| 276 | void const *pvData, size_t cbData)
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| 277 | {
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| 278 | return vboxnetudpSend(pSession, hIf, pBuf,
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| 279 | SrcIPv4Addr, pSrcMacAddr, uSrcPort,
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| 280 | DstIPv4Addr, pDstMacAddr, uDstPort,
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| 281 | pvData, cbData);
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| 282 | }
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| 283 |
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| 284 |
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| 285 | /**
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| 286 | * Sends a broadcast UDP packet.
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| 287 | *
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| 288 | * @returns VBox status code.
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| 289 | * @param pSession The support driver session handle.
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| 290 | * @param hIf The interface handle.
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| 291 | * @param pBuf The interface buffer.
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| 292 | * @param SrcIPv4Addr The source IPv4 address.
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| 293 | * @param pSrcMacAddr The source MAC address.
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| 294 | * @param uSrcPort The source port number.
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| 295 | * @param uDstPort The destination port number.
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| 296 | * @param pvData The data payload.
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| 297 | * @param cbData The size of the data payload.
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| 298 | */
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| 299 | int VBoxNetUDPBroadcast(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
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| 300 | RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
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| 301 | unsigned uDstPort,
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| 302 | void const *pvData, size_t cbData)
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| 303 | {
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| 304 | RTNETADDRIPV4 IPv4AddrBrdCast;
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| 305 | IPv4AddrBrdCast.u = UINT32_C(0xffffffff);
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| 306 | RTMAC MacBrdCast;
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| 307 | MacBrdCast.au16[0] = MacBrdCast.au16[1] = MacBrdCast.au16[2] = UINT16_C(0xffff);
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| 308 |
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| 309 | return vboxnetudpSend(pSession, hIf, pBuf,
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| 310 | SrcIPv4Addr, pSrcMacAddr, uSrcPort,
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| 311 | IPv4AddrBrdCast, &MacBrdCast, uDstPort,
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| 312 | pvData, cbData);
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| 313 | }
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| 314 |
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