VBoxNetUDP.cpp@ 52560

Last change on this file since 52560 was 46904, checked in by vboxsync, 11 years ago
IntNet, VirtioNet, NetFilter: Large frame support + drop oversized + UFO fix (#6821)
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 10.5 KB

Line
1	/* $Id: VBoxNetUDP.cpp 46904 2013-07-02 12:59:56Z vboxsync $ */
2	/** @file
3	* VBoxNetUDP - IntNet UDP Client Routines.
4	*/
5
6	/*
7	* Copyright (C) 2009-2010 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	* Header Files *
20	*******************************************************************************/
21	#define LOG_GROUP LOG_GROUP_DEFAULT
22	#include "VBoxNetLib.h"
23	#include <iprt/stream.h>
24	#include <iprt/string.h>
25	#include <iprt/rand.h>
26	#include <VBox/log.h>
27	#include <VBox/vmm/pdmnetinline.h>
28	#include <VBox/intnetinline.h>
29
30
31	/**
32	* Checks if the head of the receive ring is a UDP packet matching the given
33	* criteria.
34	*
35	* @returns Pointer to the data if it matches.
36	* @param pBuf The IntNet buffers.
37	* @param uDstPort The destination port to match.
38	* @param pDstMac The destination address to match if
39	* VBOXNETUDP_MATCH_UNICAST is specied.
40	* @param fFlags Flags indicating what to match and some debug stuff.
41	* See VBOXNETUDP_MATCH_*.
42	* @param pHdrs Where to return the pointers to the headers.
43	* Optional.
44	* @param pcb Where to return the size of the data on success.
45	*/
46	void VBoxNetUDPMatch(PINTNETBUF pBuf, unsigned uDstPort, PCRTMAC pDstMac, uint32_t fFlags, PVBOXNETUDPHDRS pHdrs, size_t pcb)
47	{
48	/*
49	* Clear return values so we can return easier on mismatch.
50	*/
51	*pcb = 0;
52	if (pHdrs)
53	{
54	pHdrs->pEth = NULL;
55	pHdrs->pIpv4 = NULL;
56	pHdrs->pUdp = NULL;
57	}
58
59	/*
60	* Valid IntNet Ethernet frame?
61	*/
62	PCINTNETHDR pHdr = IntNetRingGetNextFrameToRead(&pBuf->Recv);
63	if ( !pHdr
64	\|\| ( pHdr->u8Type != INTNETHDR_TYPE_FRAME
65	&& pHdr->u8Type != INTNETHDR_TYPE_GSO))
66	return NULL;
67
68	size_t cbFrame = pHdr->cbFrame;
69	const void *pvFrame = IntNetHdrGetFramePtr(pHdr, pBuf);
70	PCPDMNETWORKGSO pGso = NULL;
71	if (pHdr->u8Type == INTNETHDR_TYPE_GSO)
72	{
73	pGso = (PCPDMNETWORKGSO)pvFrame;
74	if (!PDMNetGsoIsValid(pGso, cbFrame, cbFrame - sizeof(*pGso)))
75	return NULL;
76	/** @todo IPv6 UDP support, goes for this entire function really. Not really
77	* important yet since this is currently only used by the DHCP server. */
78	if (pGso->u8Type != PDMNETWORKGSOTYPE_IPV4_UDP)
79	return NULL;
80	pvFrame = pGso + 1;
81	cbFrame -= sizeof(*pGso);
82	}
83
84	PCRTNETETHERHDR pEthHdr = (PCRTNETETHERHDR)pvFrame;
85	if (pHdrs)
86	pHdrs->pEth = pEthHdr;
87
88	#ifdef IN_RING3
89	/* Dump if to stderr/log if that's wanted. */
90	if (fFlags & VBOXNETUDP_MATCH_PRINT_STDERR)
91	{
92	RTStrmPrintf(g_pStdErr, "frame: cb=%04x dst=%.6Rhxs src=%.6Rhxs type=%04x%s\n",
93	cbFrame, &pEthHdr->DstMac, &pEthHdr->SrcMac, RT_BE2H_U16(pEthHdr->EtherType),
94	!memcmp(&pEthHdr->DstMac, pDstMac, sizeof(*pDstMac)) ? " Mine!" : "");
95	}
96	#endif
97
98	/*
99	* Ethernet matching.
100	*/
101
102	/* Ethernet min frame size. */
103	if (cbFrame < 64)
104	return NULL;
105
106	/* Match Ethertype: IPV4? */
107	/** @todo VLAN tagging? */
108	if (pEthHdr->EtherType != RT_H2BE_U16_C(RTNET_ETHERTYPE_IPV4))
109	return NULL;
110
111	/* Match destination address (ethernet) */
112	if ( ( !(fFlags & VBOXNETUDP_MATCH_UNICAST)
113	\|\| memcmp(&pEthHdr->DstMac, pDstMac, sizeof(pEthHdr->DstMac)))
114	&& ( !(fFlags & VBOXNETUDP_MATCH_BROADCAST)
115	\|\| pEthHdr->DstMac.au16[0] != 0xffff
116	\|\| pEthHdr->DstMac.au16[1] != 0xffff
117	\|\| pEthHdr->DstMac.au16[2] != 0xffff))
118	return NULL;
119
120	/*
121	* If we're working on a GSO frame, we need to make sure the length fields
122	* are set correctly (they are usually set to 0).
123	*/
124	if (pGso)
125	PDMNetGsoPrepForDirectUse(pGso, (void *)pvFrame, cbFrame, PDMNETCSUMTYPE_NONE);
126
127	/*
128	* IP validation and matching.
129	*/
130	PCRTNETIPV4 pIpHdr = (PCRTNETIPV4)(pEthHdr + 1);
131	if (pHdrs)
132	pHdrs->pIpv4 = pIpHdr;
133
134	/* Protocol: UDP */
135	if (pIpHdr->ip_p != RTNETIPV4_PROT_UDP)
136	return NULL;
137
138	/* Valid IPv4 header? */
139	size_t const offIpHdr = (uintptr_t)pIpHdr - (uintptr_t)pEthHdr;
140	if (!RTNetIPv4IsHdrValid(pIpHdr, cbFrame - offIpHdr, cbFrame - offIpHdr, !pGso /fChecksum/))
141	return NULL;
142
143	/*
144	* UDP matching and validation.
145	*/
146	PCRTNETUDP pUdpHdr = (PCRTNETUDP)((uint32_t *)pIpHdr + pIpHdr->ip_hl);
147	if (pHdrs)
148	pHdrs->pUdp = pUdpHdr;
149
150	/* Destination port */
151	if (RT_BE2H_U16(pUdpHdr->uh_dport) != uDstPort)
152	return NULL;
153
154	if (!pGso)
155	{
156	/* Validate the UDP header according to flags. */
157	size_t offUdpHdr = (uintptr_t)pUdpHdr - (uintptr_t)pEthHdr;
158	if (fFlags & (VBOXNETUDP_MATCH_CHECKSUM \| VBOXNETUDP_MATCH_REQUIRE_CHECKSUM))
159	{
160	if (!RTNetIPv4IsUDPValid(pIpHdr, pUdpHdr, pUdpHdr + 1, cbFrame - offUdpHdr, true /fChecksum/))
161	return NULL;
162	if ( (fFlags & VBOXNETUDP_MATCH_REQUIRE_CHECKSUM)
163	&& !pUdpHdr->uh_sum)
164	return NULL;
165	}
166	else
167	{
168	if (!RTNetIPv4IsUDPSizeValid(pIpHdr, pUdpHdr, cbFrame - offUdpHdr))
169	return NULL;
170	}
171	}
172
173	/*
174	* We've got a match!
175	*/
176	pcb = pUdpHdr->uh_ulen - sizeof(pUdpHdr);
177	return (void *)(pUdpHdr + 1);
178	}
179
180
181	/** Internal worker for VBoxNetUDPUnicast and VBoxNetUDPBroadcast. */
182	static int vboxnetudpSend(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
183	RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
184	RTNETADDRIPV4 DstIPv4Addr, PCRTMAC pDstMacAddr, unsigned uDstPort,
185	void const *pvData, size_t cbData)
186	{
187	INTNETSEG aSegs[4];
188
189	/* the Ethernet header */
190	RTNETETHERHDR EtherHdr;
191	EtherHdr.DstMac = *pDstMacAddr;
192	EtherHdr.SrcMac = *pSrcMacAddr;
193	EtherHdr.EtherType = RT_H2BE_U16_C(RTNET_ETHERTYPE_IPV4);
194
195	aSegs[0].pv = &EtherHdr;
196	aSegs[0].cb = sizeof(EtherHdr);
197	aSegs[0].Phys = NIL_RTHCPHYS;
198
199	/* the IP header */
200	RTNETIPV4 IpHdr;
201	unsigned cbIdHdr = RT_UOFFSETOF(RTNETIPV4, ip_options);
202	IpHdr.ip_v = 4;
203	IpHdr.ip_hl = cbIdHdr >> 2;
204	IpHdr.ip_tos = 0;
205	IpHdr.ip_len = RT_H2BE_U16((uint16_t)(cbData + sizeof(RTNETUDP) + cbIdHdr));
206	IpHdr.ip_id = (uint16_t)RTRandU32();
207	IpHdr.ip_off = 0;
208	IpHdr.ip_ttl = 255;
209	IpHdr.ip_p = RTNETIPV4_PROT_UDP;
210	IpHdr.ip_sum = 0;
211	IpHdr.ip_src = SrcIPv4Addr;
212	IpHdr.ip_dst = DstIPv4Addr;
213	IpHdr.ip_sum = RTNetIPv4HdrChecksum(&IpHdr);
214
215	aSegs[1].pv = &IpHdr;
216	aSegs[1].cb = cbIdHdr;
217	aSegs[1].Phys = NIL_RTHCPHYS;
218
219
220	/* the UDP bit */
221	RTNETUDP UdpHdr;
222	UdpHdr.uh_sport = RT_H2BE_U16(uSrcPort);
223	UdpHdr.uh_dport = RT_H2BE_U16(uDstPort);
224	UdpHdr.uh_ulen = RT_H2BE_U16((uint16_t)(cbData + sizeof(RTNETUDP)));
225	#if 0
226	UdpHdr.uh_sum = 0; /* pretend checksumming is disabled */
227	#else
228	UdpHdr.uh_sum = RTNetIPv4UDPChecksum(&IpHdr, &UdpHdr, pvData);
229	#endif
230
231	aSegs[2].pv = &UdpHdr;
232	aSegs[2].cb = sizeof(UdpHdr);
233	aSegs[2].Phys = NIL_RTHCPHYS;
234
235	/* the payload */
236	aSegs[3].pv = (void *)pvData;
237	aSegs[3].cb = (uint32_t)cbData;
238	aSegs[3].Phys = NIL_RTHCPHYS;
239
240
241	/* send it */
242	return VBoxNetIntIfSend(pSession, hIf, pBuf, RT_ELEMENTS(aSegs), &aSegs[0], true /* fFlush */);
243	}
244
245
246	/**
247	* Sends an unicast UDP packet.
248	*
249	* @returns VBox status code.
250	* @param pSession The support driver session handle.
251	* @param hIf The interface handle.
252	* @param pBuf The interface buffer.
253	* @param SrcIPv4Addr The source IPv4 address.
254	* @param pSrcMacAddr The source MAC address.
255	* @param uSrcPort The source port number.
256	* @param DstIPv4Addr The destination IPv4 address. Can be broadcast.
257	* @param pDstMacAddr The destination MAC address.
258	* @param uDstPort The destination port number.
259	* @param pvData The data payload.
260	* @param cbData The size of the data payload.
261	*/
262	int VBoxNetUDPUnicast(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
263	RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
264	RTNETADDRIPV4 DstIPv4Addr, PCRTMAC pDstMacAddr, unsigned uDstPort,
265	void const *pvData, size_t cbData)
266	{
267	return vboxnetudpSend(pSession, hIf, pBuf,
268	SrcIPv4Addr, pSrcMacAddr, uSrcPort,
269	DstIPv4Addr, pDstMacAddr, uDstPort,
270	pvData, cbData);
271	}
272
273
274	/**
275	* Sends a broadcast UDP packet.
276	*
277	* @returns VBox status code.
278	* @param pSession The support driver session handle.
279	* @param hIf The interface handle.
280	* @param pBuf The interface buffer.
281	* @param SrcIPv4Addr The source IPv4 address.
282	* @param pSrcMacAddr The source MAC address.
283	* @param uSrcPort The source port number.
284	* @param uDstPort The destination port number.
285	* @param pvData The data payload.
286	* @param cbData The size of the data payload.
287	*/
288	int VBoxNetUDPBroadcast(PSUPDRVSESSION pSession, INTNETIFHANDLE hIf, PINTNETBUF pBuf,
289	RTNETADDRIPV4 SrcIPv4Addr, PCRTMAC pSrcMacAddr, unsigned uSrcPort,
290	unsigned uDstPort,
291	void const *pvData, size_t cbData)
292	{
293	RTNETADDRIPV4 IPv4AddrBrdCast;
294	IPv4AddrBrdCast.u = UINT32_C(0xffffffff);
295	RTMAC MacBrdCast;
296	MacBrdCast.au16[0] = MacBrdCast.au16[1] = MacBrdCast.au16[2] = UINT16_C(0xffff);
297
298	return vboxnetudpSend(pSession, hIf, pBuf,
299	SrcIPv4Addr, pSrcMacAddr, uSrcPort,
300	IPv4AddrBrdCast, &MacBrdCast, uDstPort,
301	pvData, cbData);
302	}
303

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source: vbox/trunk/src/VBox/NetworkServices/NetLib/VBoxNetUDP.cpp@ 52560

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