| 1 | /* $Id: VBoxNetUDP.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * VBoxNetUDP - IntNet UDP Client Routines.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2009-2020 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | */
|
|---|
| 17 |
|
|---|
| 18 |
|
|---|
| 19 | /*********************************************************************************************************************************
|
|---|
| 20 | * Header Files *
|
|---|
| 21 | *********************************************************************************************************************************/
|
|---|
| 22 | #define LOG_GROUP LOG_GROUP_DEFAULT
|
|---|
| 23 | #include "VBoxNetLib.h"
|
|---|
| 24 | #include <iprt/stream.h>
|
|---|
| 25 | #include <iprt/string.h>
|
|---|
| 26 | #include <iprt/rand.h>
|
|---|
| 27 | #include <VBox/log.h>
|
|---|
| 28 | #include <VBox/vmm/pdmnetinline.h>
|
|---|
| 29 | #include <VBox/intnetinline.h>
|
|---|
| 30 |
|
|---|
| 31 |
|
|---|
| 32 | /**
|
|---|
| 33 | * Checks if the head of the receive ring is a UDP packet matching the given
|
|---|
| 34 | * criteria.
|
|---|
| 35 | *
|
|---|
| 36 | * @returns Pointer to the data if it matches.
|
|---|
| 37 | * @param pBuf The IntNet buffers.
|
|---|
| 38 | * @param uDstPort The destination port to match.
|
|---|
| 39 | * @param pDstMac The destination address to match if
|
|---|
| 40 | * VBOXNETUDP_MATCH_UNICAST is specied.
|
|---|
| 41 | * @param fFlags Flags indicating what to match and some debug stuff.
|
|---|
| 42 | * See VBOXNETUDP_MATCH_*.
|
|---|
| 43 | * @param pHdrs Where to return the pointers to the headers.
|
|---|
| 44 | * Optional.
|
|---|
| 45 | * @param pcb Where to return the size of the data on success.
|
|---|
| 46 | */
|
|---|
| 47 | void *VBoxNetUDPMatch(PINTNETBUF pBuf, unsigned uDstPort, PCRTMAC pDstMac, uint32_t fFlags, PVBOXNETUDPHDRS pHdrs, size_t *pcb)
|
|---|
| 48 | {
|
|---|
| 49 | /*
|
|---|
| 50 | * Clear return values so we can return easier on mismatch.
|
|---|
| 51 | */
|
|---|
| 52 | *pcb = 0;
|
|---|
| 53 | if (pHdrs)
|
|---|
| 54 | {
|
|---|
| 55 | pHdrs->pEth = NULL;
|
|---|
| 56 | pHdrs->pIpv4 = NULL;
|
|---|
| 57 | pHdrs->pUdp = NULL;
|
|---|
| 58 | }
|
|---|
| 59 |
|
|---|
| 60 | /*
|
|---|
| 61 | * Valid IntNet Ethernet frame?
|
|---|
| 62 | */
|
|---|
| 63 | PCINTNETHDR pHdr = IntNetRingGetNextFrameToRead(&pBuf->Recv);
|
|---|
| 64 | if ( !pHdr
|
|---|
| 65 | || ( pHdr->u8Type != INTNETHDR_TYPE_FRAME
|
|---|
| 66 | && pHdr->u8Type != INTNETHDR_TYPE_GSO))
|
|---|
| 67 | return NULL;
|
|---|
| 68 |
|
|---|
| 69 | size_t cbFrame = pHdr->cbFrame;
|
|---|
| 70 | const void *pvFrame = IntNetHdrGetFramePtr(pHdr, pBuf);
|
|---|
| 71 | PCPDMNETWORKGSO pGso = NULL;
|
|---|
| 72 | if (pHdr->u8Type == INTNETHDR_TYPE_GSO)
|
|---|
| 73 | {
|
|---|
| 74 | pGso = (PCPDMNETWORKGSO)pvFrame;
|
|---|
| 75 | if (!PDMNetGsoIsValid(pGso, cbFrame, cbFrame - sizeof(*pGso)))
|
|---|
| 76 | return NULL;
|
|---|
| 77 | /** @todo IPv6 UDP support, goes for this entire function really. Not really
|
|---|
| 78 | * important yet since this is currently only used by the DHCP server. */
|
|---|
| 79 | if (pGso->u8Type != PDMNETWORKGSOTYPE_IPV4_UDP)
|
|---|
| 80 | return NULL;
|
|---|
| 81 | pvFrame = pGso + 1;
|
|---|
| 82 | cbFrame -= sizeof(*pGso);
|
|---|
| 83 | }
|
|---|
| 84 |
|
|---|
| 85 | PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame;
|
|---|
| 86 | if (pHdrs)
|
|---|
| 87 | pHdrs->pEth = pEthHdr;
|
|---|
| 88 |
|
|---|
| 89 | #ifdef IN_RING3
|
|---|
| 90 | /* Dump if to stderr/log if that's wanted. */
|
|---|
| 91 | if (fFlags & VBOXNETUDP_MATCH_PRINT_STDERR)
|
|---|
| 92 | {
|
|---|
| 93 | RTStrmPrintf(g_pStdErr, "frame: cb=%04x dst=%.6Rhxs src=%.6Rhxs type=%04x%s\n",
|
|---|
| 94 | cbFrame, &pEthHdr->DstMac, &pEthHdr->SrcMac, RT_BE2H_U16(pEthHdr->EtherType),
|
|---|
| 95 | !memcmp(&pEthHdr->DstMac, pDstMac, sizeof(*pDstMac)) ? " Mine!" : "");
|
|---|
| 96 | }
|
|---|
| 97 | #endif
|
|---|
| 98 |
|
|---|
| 99 | /*
|
|---|
| 100 | * Ethernet matching.
|
|---|
| 101 | */
|
|---|
| 102 |
|
|---|
| 103 | /* Ethernet min frame size. */
|
|---|
| 104 | if (cbFrame < 64)
|
|---|
| 105 | return NULL;
|
|---|
| 106 |
|
|---|
| 107 | /* Match Ethertype: IPV4? */
|
|---|
| 108 | /** @todo VLAN tagging? */
|
|---|
| 109 | if (pEthHdr->EtherType != RT_H2BE_U16_C(RTNET_ETHERTYPE_IPV4))
|
|---|
| 110 | return NULL;
|
|---|
| 111 |
|
|---|
| 112 | /* Match destination address (ethernet) */
|
|---|
| 113 | if ( ( !(fFlags & VBOXNETUDP_MATCH_UNICAST)
|
|---|
| 114 | || memcmp(&pEthHdr->DstMac, pDstMac, sizeof(pEthHdr->DstMac)))
|
|---|
| 115 | && ( !(fFlags & VBOXNETUDP_MATCH_BROADCAST)
|
|---|
| 116 | || pEthHdr->DstMac.au16[0] != 0xffff
|
|---|
| 117 | || pEthHdr->DstMac.au16[1] != 0xffff
|
|---|
| 118 | || pEthHdr->DstMac.au16[2] != 0xffff))
|
|---|
| 119 | return NULL;
|
|---|
| 120 |
|
|---|
| 121 | /*
|
|---|
| 122 | * If we're working on a GSO frame, we need to make sure the length fields
|
|---|
| 123 | * are set correctly (they are usually set to 0).
|
|---|
| 124 | */
|
|---|
| 125 | if (pGso)
|
|---|
| 126 | PDMNetGsoPrepForDirectUse(pGso, (void *)pvFrame, cbFrame, PDMNETCSUMTYPE_NONE);
|
|---|
| 127 |
|
|---|
| 128 | /*
|
|---|
| 129 | * IP validation and matching.
|
|---|
| 130 | */
|
|---|
| 131 | PCRTNETIPV4 pIpHdr = (PCRTNETIPV4)(pEthHdr + 1);
|
|---|
| 132 | if (pHdrs)
|
|---|
| 133 | pHdrs->pIpv4 = pIpHdr;
|
|---|
| 134 |
|
|---|
| 135 | /* Protocol: UDP */
|
|---|
| 136 | if (pIpHdr->ip_p != RTNETIPV4_PROT_UDP)
|
|---|
| 137 | return NULL;
|
|---|
| 138 |
|
|---|
| 139 | /* Valid IPv4 header? */
|
|---|
| 140 | size_t const offIpHdr = (uintptr_t)pIpHdr - (uintptr_t)pEthHdr;
|
|---|
| 141 | if (!RTNetIPv4IsHdrValid(pIpHdr, cbFrame - offIpHdr, cbFrame - offIpHdr, !pGso /*fChecksum*/))
|
|---|
| 142 | return NULL;
|
|---|
| 143 |
|
|---|
| 144 | /*
|
|---|
| 145 | * UDP matching and validation.
|
|---|
| 146 | */
|
|---|
| 147 | PCRTNETUDP pUdpHdr = (PCRTNETUDP)((uint32_t *)pIpHdr + pIpHdr->ip_hl);
|
|---|
| 148 | if (pHdrs)
|
|---|
| 149 | pHdrs->pUdp = pUdpHdr;
|
|---|
| 150 |
|
|---|
| 151 | /* Destination port */
|
|---|
| 152 | if (RT_BE2H_U16(pUdpHdr->uh_dport) != uDstPort)
|
|---|
| 153 | return NULL;
|
|---|
| 154 |
|
|---|
| 155 | if (!pGso)
|
|---|
| 156 | {
|
|---|
| 157 | /* Validate the UDP header according to flags. */
|
|---|
| 158 | size_t offUdpHdr = (uintptr_t)pUdpHdr - (uintptr_t)pEthHdr;
|
|---|
| 159 | if (fFlags & (VBOXNETUDP_MATCH_CHECKSUM | VBOXNETUDP_MATCH_REQUIRE_CHECKSUM))
|
|---|
| 160 | {
|
|---|
| 161 | if (!RTNetIPv4IsUDPValid(pIpHdr, pUdpHdr, pUdpHdr + 1, cbFrame - offUdpHdr, true /*fChecksum*/))
|
|---|
| 162 | return NULL;
|
|---|
| 163 | if ( (fFlags & VBOXNETUDP_MATCH_REQUIRE_CHECKSUM)
|
|---|
| 164 | && !pUdpHdr->uh_sum)
|
|---|
| 165 | return NULL;
|
|---|
| 166 | }
|
|---|
| 167 | else
|
|---|
| 168 | {
|
|---|
| 169 | if (!RTNetIPv4IsUDPSizeValid(pIpHdr, pUdpHdr, cbFrame - offUdpHdr))
|
|---|
| 170 | return NULL;
|
|---|
| 171 | }
|
|---|
| 172 | }
|
|---|
| 173 |
|
|---|
| 174 | /*
|
|---|
| 175 | * We've got a match!
|
|---|
| 176 | */
|
|---|
| 177 | *pcb = RT_N2H_U16(pUdpHdr->uh_ulen) - sizeof(*pUdpHdr);
|
|---|
| 178 | return (void *)(pUdpHdr + 1);
|
|---|
| 179 | }
|
|---|
| 180 |
|
|---|
| 181 |
|
|---|
| 182 | /** Internal worker for VBoxNetUDPUnicast and VBoxNetUDPBroadcast. */
|
|---|
| 183 | static int vboxnetudpSend(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
|
|---|
| 184 | RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
|
|---|
| 185 | RTNETADDRIPV4 DstIPv4Addr, PCRTMAC pDstMacAddr, unsigned uDstPort,
|
|---|
| 186 | void const *pvData, size_t cbData)
|
|---|
| 187 | {
|
|---|
| 188 | INTNETSEG aSegs[4];
|
|---|
| 189 |
|
|---|
| 190 | /* the Ethernet header */
|
|---|
| 191 | RTNETETHERHDR EtherHdr;
|
|---|
| 192 | EtherHdr.DstMac = *pDstMacAddr;
|
|---|
| 193 | EtherHdr.SrcMac = *pSrcMacAddr;
|
|---|
| 194 | EtherHdr.EtherType = RT_H2BE_U16_C(RTNET_ETHERTYPE_IPV4);
|
|---|
| 195 |
|
|---|
| 196 | aSegs[0].pv = &EtherHdr;
|
|---|
| 197 | aSegs[0].cb = sizeof(EtherHdr);
|
|---|
| 198 | aSegs[0].Phys = NIL_RTHCPHYS;
|
|---|
| 199 |
|
|---|
| 200 | /* the IP header */
|
|---|
| 201 | RTNETIPV4 IpHdr;
|
|---|
| 202 | unsigned cbIdHdr = RT_UOFFSETOF(RTNETIPV4, ip_options);
|
|---|
| 203 | IpHdr.ip_v = 4;
|
|---|
| 204 | IpHdr.ip_hl = cbIdHdr >> 2;
|
|---|
| 205 | IpHdr.ip_tos = 0;
|
|---|
| 206 | IpHdr.ip_len = RT_H2BE_U16((uint16_t)(cbData + sizeof(RTNETUDP) + cbIdHdr));
|
|---|
| 207 | IpHdr.ip_id = (uint16_t)RTRandU32();
|
|---|
| 208 | IpHdr.ip_off = 0;
|
|---|
| 209 | IpHdr.ip_ttl = 255;
|
|---|
| 210 | IpHdr.ip_p = RTNETIPV4_PROT_UDP;
|
|---|
| 211 | IpHdr.ip_sum = 0;
|
|---|
| 212 | IpHdr.ip_src = SrcIPv4Addr;
|
|---|
| 213 | IpHdr.ip_dst = DstIPv4Addr;
|
|---|
| 214 | IpHdr.ip_sum = RTNetIPv4HdrChecksum(&IpHdr);
|
|---|
| 215 |
|
|---|
| 216 | aSegs[1].pv = &IpHdr;
|
|---|
| 217 | aSegs[1].cb = cbIdHdr;
|
|---|
| 218 | aSegs[1].Phys = NIL_RTHCPHYS;
|
|---|
| 219 |
|
|---|
| 220 |
|
|---|
| 221 | /* the UDP bit */
|
|---|
| 222 | RTNETUDP UdpHdr;
|
|---|
| 223 | UdpHdr.uh_sport = RT_H2BE_U16(uSrcPort);
|
|---|
| 224 | UdpHdr.uh_dport = RT_H2BE_U16(uDstPort);
|
|---|
| 225 | UdpHdr.uh_ulen = RT_H2BE_U16((uint16_t)(cbData + sizeof(RTNETUDP)));
|
|---|
| 226 | #if 0
|
|---|
| 227 | UdpHdr.uh_sum = 0; /* pretend checksumming is disabled */
|
|---|
| 228 | #else
|
|---|
| 229 | UdpHdr.uh_sum = RTNetIPv4UDPChecksum(&IpHdr, &UdpHdr, pvData);
|
|---|
| 230 | #endif
|
|---|
| 231 |
|
|---|
| 232 | aSegs[2].pv = &UdpHdr;
|
|---|
| 233 | aSegs[2].cb = sizeof(UdpHdr);
|
|---|
| 234 | aSegs[2].Phys = NIL_RTHCPHYS;
|
|---|
| 235 |
|
|---|
| 236 | /* the payload */
|
|---|
| 237 | aSegs[3].pv = (void *)pvData;
|
|---|
| 238 | aSegs[3].cb = (uint32_t)cbData;
|
|---|
| 239 | aSegs[3].Phys = NIL_RTHCPHYS;
|
|---|
| 240 |
|
|---|
| 241 |
|
|---|
| 242 | /* send it */
|
|---|
| 243 | return VBoxNetIntIfSend(pSession, hIf, pBuf, RT_ELEMENTS(aSegs), &aSegs[0], true /* fFlush */);
|
|---|
| 244 | }
|
|---|
| 245 |
|
|---|
| 246 |
|
|---|
| 247 | /**
|
|---|
| 248 | * Sends an unicast UDP packet.
|
|---|
| 249 | *
|
|---|
| 250 | * @returns VBox status code.
|
|---|
| 251 | * @param pSession The support driver session handle.
|
|---|
| 252 | * @param hIf The interface handle.
|
|---|
| 253 | * @param pBuf The interface buffer.
|
|---|
| 254 | * @param SrcIPv4Addr The source IPv4 address.
|
|---|
| 255 | * @param pSrcMacAddr The source MAC address.
|
|---|
| 256 | * @param uSrcPort The source port number.
|
|---|
| 257 | * @param DstIPv4Addr The destination IPv4 address. Can be broadcast.
|
|---|
| 258 | * @param pDstMacAddr The destination MAC address.
|
|---|
| 259 | * @param uDstPort The destination port number.
|
|---|
| 260 | * @param pvData The data payload.
|
|---|
| 261 | * @param cbData The size of the data payload.
|
|---|
| 262 | */
|
|---|
| 263 | int VBoxNetUDPUnicast(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
|
|---|
| 264 | RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
|
|---|
| 265 | RTNETADDRIPV4 DstIPv4Addr, PCRTMAC pDstMacAddr, unsigned uDstPort,
|
|---|
| 266 | void const *pvData, size_t cbData)
|
|---|
| 267 | {
|
|---|
| 268 | return vboxnetudpSend(pSession, hIf, pBuf,
|
|---|
| 269 | SrcIPv4Addr, pSrcMacAddr, uSrcPort,
|
|---|
| 270 | DstIPv4Addr, pDstMacAddr, uDstPort,
|
|---|
| 271 | pvData, cbData);
|
|---|
| 272 | }
|
|---|
| 273 |
|
|---|
| 274 |
|
|---|
| 275 | /**
|
|---|
| 276 | * Sends a broadcast UDP packet.
|
|---|
| 277 | *
|
|---|
| 278 | * @returns VBox status code.
|
|---|
| 279 | * @param pSession The support driver session handle.
|
|---|
| 280 | * @param hIf The interface handle.
|
|---|
| 281 | * @param pBuf The interface buffer.
|
|---|
| 282 | * @param SrcIPv4Addr The source IPv4 address.
|
|---|
| 283 | * @param pSrcMacAddr The source MAC address.
|
|---|
| 284 | * @param uSrcPort The source port number.
|
|---|
| 285 | * @param uDstPort The destination port number.
|
|---|
| 286 | * @param pvData The data payload.
|
|---|
| 287 | * @param cbData The size of the data payload.
|
|---|
| 288 | */
|
|---|
| 289 | int VBoxNetUDPBroadcast(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
|
|---|
| 290 | RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
|
|---|
| 291 | unsigned uDstPort,
|
|---|
| 292 | void const *pvData, size_t cbData)
|
|---|
| 293 | {
|
|---|
| 294 | RTNETADDRIPV4 IPv4AddrBrdCast;
|
|---|
| 295 | IPv4AddrBrdCast.u = UINT32_C(0xffffffff);
|
|---|
| 296 | RTMAC MacBrdCast;
|
|---|
| 297 | MacBrdCast.au16[0] = MacBrdCast.au16[1] = MacBrdCast.au16[2] = UINT16_C(0xffff);
|
|---|
| 298 |
|
|---|
| 299 | return vboxnetudpSend(pSession, hIf, pBuf,
|
|---|
| 300 | SrcIPv4Addr, pSrcMacAddr, uSrcPort,
|
|---|
| 301 | IPv4AddrBrdCast, &MacBrdCast, uDstPort,
|
|---|
| 302 | pvData, cbData);
|
|---|
| 303 | }
|
|---|
| 304 |
|
|---|
