| 1 | /* $Id: VBoxNetUDP.cpp 17403 2009-03-05 14:49:41Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxNetUDP - UDP Library for IntNet.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2009 Sun Microsystems, Inc.
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 18 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 19 | * additional information or have any questions.
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| 20 | */
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| 21 |
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| 22 | /*******************************************************************************
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| 23 | * Header Files *
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| 24 | *******************************************************************************/
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| 25 | #include "VBoxNetUDP.h"
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| 26 | #include <iprt/stream.h>
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| 27 | #include <iprt/string.h>
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| 28 |
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| 29 |
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| 30 | /**
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| 31 | * Checks if the head of the receive ring is a UDP packet matching the given
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| 32 | * criteria.
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| 33 | *
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| 34 | * @returns Pointer to the data if it matches.
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| 35 | * @param pBuf The IntNet buffers.
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| 36 | * @param uDstPort The destination port to match.
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| 37 | * @param pDstMac The destination address to match if
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| 38 | * VBOXNETUDP_MATCH_UNICAST is specied.
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| 39 | * @param fFlags Flags indicating what to match and some debug stuff.
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| 40 | * See VBOXNETUDP_MATCH_*.
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| 41 | * @param pHdrs Where to return the pointers to the headers.
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| 42 | * Optional.
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| 43 | * @param pcb Where to return the size of the data on success.
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| 44 | */
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| 45 | void *VBoxNetUDPMatch(PCINTNETBUF pBuf, unsigned uDstPort, PCRTMAC pDstMac, uint32_t fFlags, PVBOXNETUDPHDRS pHdrs, size_t *pcb)
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| 46 | {
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| 47 | /*
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| 48 | * Clear return values so we can return easier on mismatch.
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| 49 | */
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| 50 | *pcb = 0;
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| 51 | if (pHdrs)
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| 52 | {
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| 53 | pHdrs->pEth = NULL;
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| 54 | pHdrs->pIpv4 = NULL;
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| 55 | pHdrs->pUdp = NULL;
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| 56 | }
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| 57 |
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| 58 | /*
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| 59 | * Valid IntNet Ethernet frame?
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| 60 | */
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| 61 | PCINTNETHDR pHdr = (PINTNETHDR)((uintptr_t)pBuf + pBuf->Recv.offRead);
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| 62 | if (pHdr->u16Type != INTNETHDR_TYPE_FRAME)
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| 63 | return NULL;
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| 64 |
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| 65 | size_t cbFrame = pHdr->cbFrame;
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| 66 | const void *pvFrame = INTNETHdrGetFramePtr(pHdr, pBuf);
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| 67 | PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame;
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| 68 | if (pHdrs)
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| 69 | pHdrs->pEth = pEthHdr;
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| 70 |
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| 71 | #ifdef IN_RING3
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| 72 | /* Dump if to stderr/log if that's wanted. */
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| 73 | if (fFlags & VBOXNETUDP_MATCH_PRINT_STDERR)
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| 74 | {
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| 75 | RTStrmPrintf(g_pStdErr, "frame: cb=%04x dst=%.6Rhxs src=%.6Rhxs type=%04x%s\n",
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| 76 | cbFrame, &pEthHdr->DstMac, &pEthHdr->SrcMac, RT_BE2H_U16(pEthHdr->EtherType),
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| 77 | !memcmp(&pEthHdr->DstMac, pDstMac, sizeof(*pDstMac)) ? " Mine!" : "");
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| 78 | }
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| 79 | #endif
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| 80 |
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| 81 | /*
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| 82 | * Ethernet matching.
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| 83 | */
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| 84 |
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| 85 | /* Ethernet min frame size. */
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| 86 | if (cbFrame < 64)
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| 87 | return NULL;
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| 88 |
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| 89 | /* Match Ethertype: IPV4? */
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| 90 | /** @todo VLAN tagging? */
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| 91 | if (pEthHdr->EtherType != RT_H2BE_U16_C(RTNET_ETHERTYPE_IPV4))
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| 92 | return NULL;
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| 93 |
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| 94 | /* Match destination address (ethernet) */
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| 95 | if ( ( !(fFlags & VBOXNETUDP_MATCH_UNICAST)
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| 96 | || memcmp(&pEthHdr->DstMac, pDstMac, sizeof(pEthHdr->DstMac)))
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| 97 | && ( !(fFlags & VBOXNETUDP_MATCH_BROADCAST)
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| 98 | || pEthHdr->DstMac.au16[0] != 0xffff
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| 99 | || pEthHdr->DstMac.au16[1] != 0xffff
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| 100 | || pEthHdr->DstMac.au16[2] != 0xffff))
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| 101 | return NULL;
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| 102 |
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| 103 | /*
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| 104 | * IP validation and matching.
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| 105 | */
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| 106 | PCRTNETIPV4 pIpHdr = (PCRTNETIPV4)(pEthHdr + 1);
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| 107 | if (pHdrs)
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| 108 | pHdrs->pIpv4 = pIpHdr;
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| 109 |
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| 110 | /* Protocol: UDP */
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| 111 | if (pIpHdr->ip_p != RTNETIPV4_PROT_UDP)
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| 112 | return NULL;
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| 113 |
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| 114 | /* Valid IPv4 header? */
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| 115 | size_t const offIpHdr = (uintptr_t)pIpHdr - (uintptr_t)pEthHdr;
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| 116 | if (!RTNetIPv4IsHdrValid(pIpHdr, cbFrame - offIpHdr, cbFrame - offIpHdr))
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| 117 | return NULL;
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| 118 |
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| 119 | /*
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| 120 | * UDP matching and validation.
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| 121 | */
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| 122 | PCRTNETUDP pUdpHdr = (PCRTNETUDP)((uint32_t *)pIpHdr + pIpHdr->ip_hl);
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| 123 | if (pHdrs)
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| 124 | pHdrs->pUdp = pUdpHdr;
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| 125 |
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| 126 | /* Destination port */
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| 127 | if (RT_BE2H_U16(pUdpHdr->uh_dport) != uDstPort)
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| 128 | return NULL;
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| 129 |
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| 130 | /* Validate the UDP header according to flags. */
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| 131 | size_t offUdpHdr = (uintptr_t)pUdpHdr - (uintptr_t)pEthHdr;
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| 132 | if (fFlags & (VBOXNETUDP_MATCH_CHECKSUM | VBOXNETUDP_MATCH_REQUIRE_CHECKSUM))
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| 133 | {
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| 134 | if (!RTNetIPv4IsUDPValid(pIpHdr, pUdpHdr, pUdpHdr + 1, cbFrame - offUdpHdr))
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| 135 | return NULL;
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| 136 | if ( (fFlags & VBOXNETUDP_MATCH_REQUIRE_CHECKSUM)
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| 137 | && !pUdpHdr->uh_sum)
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| 138 | return NULL;
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| 139 | }
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| 140 | else
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| 141 | {
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| 142 | if (!RTNetIPv4IsUDPSizeValid(pIpHdr, pUdpHdr, cbFrame - offUdpHdr))
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| 143 | return NULL;
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| 144 | }
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| 145 |
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| 146 | /*
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| 147 | * We've got a match!
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| 148 | */
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| 149 | *pcb = pUdpHdr->uh_ulen - sizeof(*pUdpHdr);
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| 150 | return (void *)(pUdpHdr + 1);
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| 151 | }
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| 152 |
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