pdmnetinline.h@ 78415

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1	/** @file
2	* PDM - Networking Helpers, Inlined Code. (DEV,++)
3	*
4	* This is all inlined because it's too tedious to create 2-3 libraries to
5	* contain it all (same bad excuse as for intnetinline.h).
6	*/
7
8	/*
9	* Copyright (C) 2010-2019 Oracle Corporation
10	*
11	* This file is part of VirtualBox Open Source Edition (OSE), as
12	* available from http://www.virtualbox.org. This file is free software;
13	* you can redistribute it and/or modify it under the terms of the GNU
14	* General Public License (GPL) as published by the Free Software
15	* Foundation, in version 2 as it comes in the "COPYING" file of the
16	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18	*
19	* The contents of this file may alternatively be used under the terms
20	* of the Common Development and Distribution License Version 1.0
21	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
22	* VirtualBox OSE distribution, in which case the provisions of the
23	* CDDL are applicable instead of those of the GPL.
24	*
25	* You may elect to license modified versions of this file under the
26	* terms and conditions of either the GPL or the CDDL or both.
27	*/
28
29	#ifndef VBOX_INCLUDED_vmm_pdmnetinline_h
30	#define VBOX_INCLUDED_vmm_pdmnetinline_h
31	#ifndef RT_WITHOUT_PRAGMA_ONCE
32	# pragma once
33	#endif
34
35
36	/*******************************************************************************
37	* Header Files *
38	*******************************************************************************/
39	#include <VBox/log.h>
40	#include <VBox/types.h>
41	#include <iprt/asm.h>
42	#include <iprt/assert.h>
43	#include <iprt/net.h>
44	#include <iprt/string.h>
45
46
47	/** @defgroup grp_pdm_net_inline The PDM Networking Helper APIs
48	* @ingroup grp_pdm
49	* @{
50	*/
51
52
53	/**
54	* Checksum type.
55	*/
56	typedef enum PDMNETCSUMTYPE
57	{
58	/** No checksum. */
59	PDMNETCSUMTYPE_NONE = 0,
60	/** Normal TCP checksum. */
61	PDMNETCSUMTYPE_COMPLETE,
62	/** Checksum on pseudo header (used with GSO). */
63	PDMNETCSUMTYPE_PSEUDO,
64	/** The usual 32-bit hack. */
65	PDMNETCSUMTYPE_32_BIT_HACK = 0x7fffffff
66	} PDMNETCSUMTYPE;
67
68
69	/**
70	* Validates the GSO context.
71	*
72	* @returns true if valid, false if not (not asserted or logged).
73	* @param pGso The GSO context.
74	* @param cbGsoMax The max size of the GSO context.
75	* @param cbFrame The max size of the GSO frame (use to validate
76	* the MSS).
77	*/
78	DECLINLINE(bool) PDMNetGsoIsValid(PCPDMNETWORKGSO pGso, size_t cbGsoMax, size_t cbFrame)
79	{
80	PDMNETWORKGSOTYPE enmType;
81
82	if (RT_LIKELY(cbGsoMax >= sizeof(*pGso)))
83	{ /* likely */ } else return false;
84
85	enmType = (PDMNETWORKGSOTYPE)pGso->u8Type;
86	if (RT_LIKELY( enmType > PDMNETWORKGSOTYPE_INVALID && enmType < PDMNETWORKGSOTYPE_END ))
87	{ /* likely */ } else return false;
88
89	/* all types requires both headers. */
90	if (RT_LIKELY( pGso->offHdr1 >= sizeof(RTNETETHERHDR) ))
91	{ /* likely */ } else return false;
92	if (RT_LIKELY( pGso->offHdr2 > pGso->offHdr1 ))
93	{ /* likely */ } else return false;
94	if (RT_LIKELY( pGso->cbHdrsTotal > pGso->offHdr2 ))
95	{ /* likely */ } else return false;
96
97	/* min size of the 1st header(s). */
98	switch (enmType)
99	{
100	case PDMNETWORKGSOTYPE_IPV4_TCP:
101	case PDMNETWORKGSOTYPE_IPV4_UDP:
102	if (RT_LIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 >= RTNETIPV4_MIN_LEN ))
103	{ /* likely */ } else return false;
104	break;
105	case PDMNETWORKGSOTYPE_IPV6_TCP:
106	case PDMNETWORKGSOTYPE_IPV6_UDP:
107	if (RT_LIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 >= RTNETIPV6_MIN_LEN ))
108	{ /* likely */ } else return false;
109	break;
110	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
111	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
112	if (RT_LIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 >= RTNETIPV4_MIN_LEN + RTNETIPV6_MIN_LEN ))
113	{ /* likely */ } else return false;
114	break;
115	case PDMNETWORKGSOTYPE_INVALID:
116	case PDMNETWORKGSOTYPE_END:
117	break;
118	/* no default case! want gcc warnings. */
119	}
120
121	/* min size of the 2nd header. */
122	switch (enmType)
123	{
124	case PDMNETWORKGSOTYPE_IPV4_TCP:
125	case PDMNETWORKGSOTYPE_IPV6_TCP:
126	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
127	if (RT_LIKELY( (unsigned)pGso->cbHdrsTotal - pGso->offHdr2 >= RTNETTCP_MIN_LEN ))
128	{ /* likely */ } else return false;
129	break;
130	case PDMNETWORKGSOTYPE_IPV4_UDP:
131	case PDMNETWORKGSOTYPE_IPV6_UDP:
132	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
133	if (RT_LIKELY( (unsigned)pGso->cbHdrsTotal - pGso->offHdr2 >= RTNETUDP_MIN_LEN ))
134	{ /* likely */ } else return false;
135	break;
136	case PDMNETWORKGSOTYPE_INVALID:
137	case PDMNETWORKGSOTYPE_END:
138	break;
139	/* no default case! want gcc warnings. */
140	}
141
142	/* There must be at more than one segment. */
143	if (RT_LIKELY( cbFrame > pGso->cbHdrsTotal ))
144	{ /* likely */ } else return false;
145	if (RT_LIKELY( cbFrame - pGso->cbHdrsTotal >= pGso->cbMaxSeg ))
146	{ /* likely */ } else return false;
147
148	return true;
149	}
150
151
152	/**
153	* Returns the length of header for a particular segment/fragment.
154	*
155	* We cannot simply treat UDP header as a part of payload because we do not
156	* want to modify the payload but still need to modify the checksum field in
157	* UDP header. So we want to include UDP header when calculating the length
158	* of headers in the first segment getting it copied to a temporary buffer
159	* along with other headers.
160	*
161	* @returns Length of headers (including UDP header for the first fragment).
162	* @param pGso The GSO context.
163	* @param iSeg The segment index.
164	*/
165	DECLINLINE(uint8_t) pdmNetSegHdrLen(PCPDMNETWORKGSO pGso, uint32_t iSeg)
166	{
167	return iSeg ? pGso->cbHdrsSeg : pGso->cbHdrsTotal;
168	}
169
170	/**
171	* Returns the length of payload for a particular segment/fragment.
172	*
173	* The first segment does not contain UDP header. The size of UDP header is
174	* determined as the difference between the total headers size and the size
175	* used during segmentation.
176	*
177	* @returns Length of payload (including UDP header for the first fragment).
178	* @param pGso The GSO context.
179	* @param iSeg The segment that we're carving out (0-based).
180	* @param cSegs The number of segments in the GSO frame.
181	* @param cbFrame The size of the GSO frame.
182	*/
183	DECLINLINE(uint32_t) pdmNetSegPayloadLen(PCPDMNETWORKGSO pGso, uint32_t iSeg, uint32_t cSegs, uint32_t cbFrame)
184	{
185	if (iSeg + 1 == cSegs)
186	return cbFrame - iSeg * pGso->cbMaxSeg - pdmNetSegHdrLen(pGso, iSeg);
187	return pGso->cbMaxSeg - (iSeg ? 0 : pGso->cbHdrsTotal - pGso->cbHdrsSeg);
188	}
189
190	/**
191	* Calculates the number of segments a GSO frame will be segmented into.
192	*
193	* @returns Segment count.
194	* @param pGso The GSO context.
195	* @param cbFrame The GSO frame size (header proto + payload).
196	*/
197	DECLINLINE(uint32_t) PDMNetGsoCalcSegmentCount(PCPDMNETWORKGSO pGso, size_t cbFrame)
198	{
199	size_t cbPayload;
200	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
201	cbPayload = cbFrame - pGso->cbHdrsSeg;
202	return (uint32_t)((cbPayload + pGso->cbMaxSeg - 1) / pGso->cbMaxSeg);
203	}
204
205
206	/**
207	* Used to find the IPv6 header when handling 4to6 tunneling.
208	*
209	* @returns Offset of the IPv6 header.
210	* @param pbSegHdrs The headers / frame start.
211	* @param offIPv4Hdr The offset of the IPv4 header.
212	*/
213	DECLINLINE(uint8_t) pgmNetGsoCalcIpv6Offset(uint8_t *pbSegHdrs, uint8_t offIPv4Hdr)
214	{
215	PCRTNETIPV4 pIPv4Hdr = (PCRTNETIPV4)&pbSegHdrs[offIPv4Hdr];
216	return offIPv4Hdr + pIPv4Hdr->ip_hl * 4;
217	}
218
219
220	/**
221	* Update an UDP header after carving out a segment
222	*
223	* @param u32PseudoSum The pseudo checksum.
224	* @param pbSegHdrs Pointer to the header bytes / frame start.
225	* @param offUdpHdr The offset into @a pbSegHdrs of the UDP header.
226	* @param pbPayload Pointer to the payload bytes.
227	* @param cbPayload The amount of payload.
228	* @param cbHdrs The size of all the headers.
229	* @param enmCsumType Whether to checksum the payload, the pseudo
230	* header or nothing.
231	* @internal
232	*/
233	DECLINLINE(void) pdmNetGsoUpdateUdpHdr(uint32_t u32PseudoSum, uint8_t *pbSegHdrs, uint8_t offUdpHdr,
234	uint8_t const *pbPayload, uint32_t cbPayload, uint8_t cbHdrs,
235	PDMNETCSUMTYPE enmCsumType)
236	{
237	PRTNETUDP pUdpHdr = (PRTNETUDP)&pbSegHdrs[offUdpHdr];
238	pUdpHdr->uh_ulen = RT_H2N_U16(cbPayload + cbHdrs - offUdpHdr);
239	switch (enmCsumType)
240	{
241	case PDMNETCSUMTYPE_NONE:
242	pUdpHdr->uh_sum = 0;
243	break;
244	case PDMNETCSUMTYPE_COMPLETE:
245	pUdpHdr->uh_sum = RTNetUDPChecksum(u32PseudoSum, pUdpHdr);
246	break;
247	case PDMNETCSUMTYPE_PSEUDO:
248	pUdpHdr->uh_sum = ~RTNetIPv4FinalizeChecksum(u32PseudoSum);
249	break;
250	default:
251	NOREF(pbPayload);
252	AssertFailed();
253	break;
254	}
255	}
256
257
258	/**
259	* Update an UDP header after carving out an IP fragment
260	*
261	* @param u32PseudoSum The pseudo checksum.
262	* @param pbSegHdrs Pointer to the header bytes copy
263	* @param pbFrame Pointer to the frame start.
264	* @param offUdpHdr The offset into @a pbSegHdrs of the UDP header.
265	*
266	* @internal
267	*/
268	DECLINLINE(void) pdmNetGsoUpdateUdpHdrUfo(uint32_t u32PseudoSum, uint8_t pbSegHdrs, const uint8_t pbFrame, uint8_t offUdpHdr)
269	{
270	PCRTNETUDP pcUdpHdrOrig = (PCRTNETUDP)&pbFrame[offUdpHdr];
271	PRTNETUDP pUdpHdr = (PRTNETUDP)&pbSegHdrs[offUdpHdr];
272	pUdpHdr->uh_sum = RTNetUDPChecksum(u32PseudoSum, pcUdpHdrOrig);
273	}
274
275
276	/**
277	* Update a TCP header after carving out a segment.
278	*
279	* @param u32PseudoSum The pseudo checksum.
280	* @param pbSegHdrs Pointer to the header bytes / frame start.
281	* @param offTcpHdr The offset into @a pbSegHdrs of the TCP header.
282	* @param pbPayload Pointer to the payload bytes.
283	* @param cbPayload The amount of payload.
284	* @param offPayload The offset into the payload that we're splitting
285	* up. We're ASSUMING that the payload follows
286	* immediately after the TCP header w/ options.
287	* @param cbHdrs The size of all the headers.
288	* @param fLastSeg Set if this is the last segment.
289	* @param enmCsumType Whether to checksum the payload, the pseudo
290	* header or nothing.
291	* @internal
292	*/
293	DECLINLINE(void) pdmNetGsoUpdateTcpHdr(uint32_t u32PseudoSum, uint8_t *pbSegHdrs, uint8_t offTcpHdr,
294	uint8_t const *pbPayload, uint32_t cbPayload, uint32_t offPayload, uint8_t cbHdrs,
295	bool fLastSeg, PDMNETCSUMTYPE enmCsumType)
296	{
297	PRTNETTCP pTcpHdr = (PRTNETTCP)&pbSegHdrs[offTcpHdr];
298	pTcpHdr->th_seq = RT_H2N_U32(RT_N2H_U32(pTcpHdr->th_seq) + offPayload);
299	if (!fLastSeg)
300	pTcpHdr->th_flags &= ~(RTNETTCP_F_FIN \| RTNETTCP_F_PSH);
301	switch (enmCsumType)
302	{
303	case PDMNETCSUMTYPE_NONE:
304	pTcpHdr->th_sum = 0;
305	break;
306	case PDMNETCSUMTYPE_COMPLETE:
307	pTcpHdr->th_sum = RTNetTCPChecksum(u32PseudoSum, pTcpHdr, pbPayload, cbPayload);
308	break;
309	case PDMNETCSUMTYPE_PSEUDO:
310	pTcpHdr->th_sum = ~RTNetIPv4FinalizeChecksum(u32PseudoSum);
311	break;
312	default:
313	NOREF(cbHdrs);
314	AssertFailed();
315	break;
316	}
317	}
318
319
320	/**
321	* Updates a IPv6 header after carving out a segment.
322	*
323	* @returns 32-bit intermediary checksum value for the pseudo header.
324	* @param pbSegHdrs Pointer to the header bytes.
325	* @param offIpHdr The offset into @a pbSegHdrs of the IP header.
326	* @param cbSegPayload The amount of segmented payload. Not to be
327	* confused with the IP payload.
328	* @param cbHdrs The size of all the headers.
329	* @param offPktHdr Offset of the protocol packet header. For the
330	* pseudo header checksum calulation.
331	* @param bProtocol The protocol type. For the pseudo header.
332	* @internal
333	*/
334	DECLINLINE(uint32_t) pdmNetGsoUpdateIPv6Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload, uint8_t cbHdrs,
335	uint8_t offPktHdr, uint8_t bProtocol)
336	{
337	PRTNETIPV6 pIpHdr = (PRTNETIPV6)&pbSegHdrs[offIpHdr];
338	uint16_t cbPayload = (uint16_t)(cbHdrs - (offIpHdr + sizeof(RTNETIPV6)) + cbSegPayload);
339	pIpHdr->ip6_plen = RT_H2N_U16(cbPayload);
340	return RTNetIPv6PseudoChecksumEx(pIpHdr, bProtocol, (uint16_t)(cbHdrs - offPktHdr + cbSegPayload));
341	}
342
343
344	/**
345	* Updates a IPv4 header after carving out a segment.
346	*
347	* @returns 32-bit intermediary checksum value for the pseudo header.
348	* @param pbSegHdrs Pointer to the header bytes.
349	* @param offIpHdr The offset into @a pbSegHdrs of the IP header.
350	* @param cbSegPayload The amount of segmented payload.
351	* @param iSeg The segment index.
352	* @param cbHdrs The size of all the headers.
353	* @internal
354	*/
355	DECLINLINE(uint32_t) pdmNetGsoUpdateIPv4Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload,
356	uint32_t iSeg, uint8_t cbHdrs)
357	{
358	PRTNETIPV4 pIpHdr = (PRTNETIPV4)&pbSegHdrs[offIpHdr];
359	pIpHdr->ip_len = RT_H2N_U16(cbHdrs - offIpHdr + cbSegPayload);
360	pIpHdr->ip_id = RT_H2N_U16(RT_N2H_U16(pIpHdr->ip_id) + iSeg);
361	pIpHdr->ip_sum = RTNetIPv4HdrChecksum(pIpHdr);
362	return RTNetIPv4PseudoChecksum(pIpHdr);
363	}
364
365
366	/**
367	* Updates a IPv4 header after carving out an IP fragment.
368	*
369	* @param pbSegHdrs Pointer to the header bytes.
370	* @param offIpHdr The offset into @a pbSegHdrs of the IP header.
371	* @param cbSegPayload The amount of segmented payload.
372	* @param offFragment The offset of this fragment for reassembly.
373	* @param cbHdrs The size of all the headers.
374	* @param fLastFragment True if this is the last fragment of datagram.
375	* @internal
376	*/
377	DECLINLINE(void) pdmNetGsoUpdateIPv4HdrUfo(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload,
378	uint32_t offFragment, uint8_t cbHdrs, bool fLastFragment)
379	{
380	PRTNETIPV4 pIpHdr = (PRTNETIPV4)&pbSegHdrs[offIpHdr];
381	pIpHdr->ip_len = RT_H2N_U16(cbHdrs - offIpHdr + cbSegPayload);
382	pIpHdr->ip_off = RT_H2N_U16((offFragment / 8) \| (fLastFragment ? 0 : RTNETIPV4_FLAGS_MF));
383	pIpHdr->ip_sum = RTNetIPv4HdrChecksum(pIpHdr);
384	}
385
386
387	/**
388	* Carves out the specified segment in a destructive manner.
389	*
390	* This is for sequentially carving out segments and pushing them along for
391	* processing or sending. To avoid allocating a temporary buffer for
392	* constructing the segment in, we trash the previous frame by putting the
393	* header at the end of it.
394	*
395	* @returns Pointer to the segment frame that we've carved out.
396	* @param pGso The GSO context data.
397	* @param pbFrame Pointer to the GSO frame.
398	* @param cbFrame The size of the GSO frame.
399	* @param pbHdrScatch Pointer to a pGso->cbHdrs sized area where we
400	* can save the original header prototypes on the
401	* first call (@a iSeg is 0) and retrieve it on
402	* susequent calls. (Just use a 256 bytes
403	* buffer to make life easy.)
404	* @param iSeg The segment that we're carving out (0-based).
405	* @param cSegs The number of segments in the GSO frame. Use
406	* PDMNetGsoCalcSegmentCount to find this.
407	* @param pcbSegFrame Where to return the size of the returned segment
408	* frame.
409	*/
410	DECLINLINE(void ) PDMNetGsoCarveSegmentQD(PCPDMNETWORKGSO pGso, uint8_t pbFrame, size_t cbFrame, uint8_t *pbHdrScatch,
411	uint32_t iSeg, uint32_t cSegs, uint32_t *pcbSegFrame)
412	{
413	/*
414	* Figure out where the payload is and where the header starts before we
415	* do the protocol specific carving.
416	*/
417	uint8_t * const pbSegHdrs = pbFrame + pGso->cbMaxSeg * iSeg;
418	uint8_t * const pbSegPayload = pbSegHdrs + pGso->cbHdrsSeg;
419	uint32_t const cbSegPayload = pdmNetSegPayloadLen(pGso, iSeg, cSegs, (uint32_t)cbFrame);
420	uint32_t const cbSegFrame = cbSegPayload + pGso->cbHdrsSeg;
421
422	/*
423	* Check assumptions (doing it after declaring the variables because of C).
424	*/
425	Assert(iSeg < cSegs);
426	Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame));
427	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
428
429	/*
430	* Copy the header and do the protocol specific massaging of it.
431	*/
432	if (iSeg != 0)
433	memcpy(pbSegHdrs, pbHdrScatch, pGso->cbHdrsSeg);
434	else
435	memcpy(pbHdrScatch, pbSegHdrs, pGso->cbHdrsSeg); /* There is no need to save UDP header */
436
437	switch ((PDMNETWORKGSOTYPE)pGso->u8Type)
438	{
439	case PDMNETWORKGSOTYPE_IPV4_TCP:
440	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg),
441	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
442	pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
443	break;
444	case PDMNETWORKGSOTYPE_IPV4_UDP:
445	if (iSeg == 0)
446	pdmNetGsoUpdateUdpHdrUfo(RTNetIPv4PseudoChecksum((PRTNETIPV4)&pbFrame[pGso->offHdr1]),
447	pbSegHdrs, pbFrame, pGso->offHdr2);
448	pdmNetGsoUpdateIPv4HdrUfo(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg * pGso->cbMaxSeg,
449	pdmNetSegHdrLen(pGso, iSeg), iSeg + 1 == cSegs);
450	break;
451	case PDMNETWORKGSOTYPE_IPV6_TCP:
452	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrsSeg,
453	pGso->offHdr2, RTNETIPV4_PROT_TCP),
454	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
455	pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
456	break;
457	case PDMNETWORKGSOTYPE_IPV6_UDP:
458	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrsSeg,
459	pGso->offHdr2, RTNETIPV4_PROT_UDP),
460	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrsSeg, PDMNETCSUMTYPE_COMPLETE);
461	break;
462	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
463	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg);
464	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
465	cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_TCP),
466	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
467	pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
468	break;
469	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
470	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg);
471	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
472	cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_UDP),
473	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrsSeg, PDMNETCSUMTYPE_COMPLETE);
474	break;
475	case PDMNETWORKGSOTYPE_INVALID:
476	case PDMNETWORKGSOTYPE_END:
477	/* no default! wnat gcc warnings. */
478	break;
479	}
480
481	*pcbSegFrame = cbSegFrame;
482	return pbSegHdrs;
483	}
484
485
486	/**
487	* Carves out the specified segment in a non-destructive manner.
488	*
489	* The segment headers and segment payload is kept separate here. The GSO frame
490	* is still expected to be one linear chunk of data, but we don't modify any of
491	* it.
492	*
493	* @returns The offset into the GSO frame of the payload.
494	* @param pGso The GSO context data.
495	* @param pbFrame Pointer to the GSO frame. Used for retrieving
496	* the header prototype and for checksumming the
497	* payload. The buffer is not modified.
498	* @param cbFrame The size of the GSO frame.
499	* @param iSeg The segment that we're carving out (0-based).
500	* @param cSegs The number of segments in the GSO frame. Use
501	* PDMNetGsoCalcSegmentCount to find this.
502	* @param pbSegHdrs Where to return the headers for the segment
503	* that's been carved out. The buffer must be at
504	* least pGso->cbHdrs in size, using a 256 byte
505	* buffer is a recommended simplification.
506	* @param pcbSegHdrs Where to return the size of the returned
507	* segment headers.
508	* @param pcbSegPayload Where to return the size of the returned
509	* segment payload.
510	*/
511	DECLINLINE(uint32_t) PDMNetGsoCarveSegment(PCPDMNETWORKGSO pGso, const uint8_t *pbFrame, size_t cbFrame,
512	uint32_t iSeg, uint32_t cSegs, uint8_t *pbSegHdrs,
513	uint32_t pcbSegHdrs, uint32_t pcbSegPayload)
514	{
515	/*
516	* Figure out where the payload is and where the header starts before we
517	* do the protocol specific carving.
518	*/
519	uint32_t const cbSegHdrs = pdmNetSegHdrLen(pGso, iSeg);
520	uint8_t const * const pbSegPayload = pbFrame + cbSegHdrs + iSeg * pGso->cbMaxSeg;
521	uint32_t const cbSegPayload = pdmNetSegPayloadLen(pGso, iSeg, cSegs, (uint32_t)cbFrame);
522
523	/*
524	* Check assumptions (doing it after declaring the variables because of C).
525	*/
526	Assert(iSeg < cSegs);
527	Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame));
528	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
529
530	/*
531	* Copy the header and do the protocol specific massaging of it.
532	*/
533	memcpy(pbSegHdrs, pbFrame, pGso->cbHdrsTotal); /* include UDP header */
534
535	switch ((PDMNETWORKGSOTYPE)pGso->u8Type)
536	{
537	case PDMNETWORKGSOTYPE_IPV4_TCP:
538	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs),
539	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
540	cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
541	break;
542	case PDMNETWORKGSOTYPE_IPV4_UDP:
543	if (iSeg == 0)
544	pdmNetGsoUpdateUdpHdrUfo(RTNetIPv4PseudoChecksum((PRTNETIPV4)&pbFrame[pGso->offHdr1]),
545	pbSegHdrs, pbFrame, pGso->offHdr2);
546	pdmNetGsoUpdateIPv4HdrUfo(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg * pGso->cbMaxSeg,
547	cbSegHdrs, iSeg + 1 == cSegs);
548	break;
549	case PDMNETWORKGSOTYPE_IPV6_TCP:
550	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, cbSegHdrs,
551	pGso->offHdr2, RTNETIPV4_PROT_TCP),
552	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
553	cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
554	break;
555	case PDMNETWORKGSOTYPE_IPV6_UDP:
556	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, cbSegHdrs,
557	pGso->offHdr2, RTNETIPV4_PROT_UDP),
558	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, cbSegHdrs, PDMNETCSUMTYPE_COMPLETE);
559	break;
560	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
561	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs);
562	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
563	cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_TCP),
564	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
565	cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
566	break;
567	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
568	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs);
569	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
570	cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_UDP),
571	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, cbSegHdrs, PDMNETCSUMTYPE_COMPLETE);
572	break;
573	case PDMNETWORKGSOTYPE_INVALID:
574	case PDMNETWORKGSOTYPE_END:
575	/* no default! wnat gcc warnings. */
576	break;
577	}
578
579	*pcbSegHdrs = cbSegHdrs;
580	*pcbSegPayload = cbSegPayload;
581	return cbSegHdrs + iSeg * pGso->cbMaxSeg;
582	}
583
584
585	/**
586	* Prepares the GSO frame for direct use without any segmenting.
587	*
588	* @param pGso The GSO context.
589	* @param pvFrame The frame to prepare.
590	* @param cbFrame The frame size.
591	* @param enmCsumType Whether to checksum the payload, the pseudo
592	* header or nothing.
593	*/
594	DECLINLINE(void) PDMNetGsoPrepForDirectUse(PCPDMNETWORKGSO pGso, void *pvFrame, size_t cbFrame, PDMNETCSUMTYPE enmCsumType)
595	{
596	/*
597	* Figure out where the payload is and where the header starts before we
598	* do the protocol bits.
599	*/
600	uint8_t * const pbHdrs = (uint8_t *)pvFrame;
601	uint8_t * const pbPayload = pbHdrs + pGso->cbHdrsTotal;
602	uint32_t const cbFrame32 = (uint32_t)cbFrame;
603	uint32_t const cbPayload = cbFrame32 - pGso->cbHdrsTotal;
604
605	/*
606	* Check assumptions (doing it after declaring the variables because of C).
607	*/
608	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
609
610	/*
611	* Get down to busienss.
612	*/
613	switch ((PDMNETWORKGSOTYPE)pGso->u8Type)
614	{
615	case PDMNETWORKGSOTYPE_IPV4_TCP:
616	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbFrame32 - pGso->cbHdrsTotal, 0, pGso->cbHdrsTotal),
617	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType);
618	break;
619	case PDMNETWORKGSOTYPE_IPV4_UDP:
620	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbFrame32 - pGso->cbHdrsTotal, 0, pGso->cbHdrsTotal),
621	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType);
622	break;
623	case PDMNETWORKGSOTYPE_IPV6_TCP:
624	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pGso->offHdr1, cbPayload, pGso->cbHdrsTotal,
625	pGso->offHdr2, RTNETIPV4_PROT_TCP),
626	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType);
627	break;
628	case PDMNETWORKGSOTYPE_IPV6_UDP:
629	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pGso->offHdr1, cbPayload, pGso->cbHdrsTotal,
630	pGso->offHdr2, RTNETIPV4_PROT_UDP),
631	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType);
632	break;
633	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
634	pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbPayload, 0, pGso->cbHdrsTotal);
635	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pgmNetGsoCalcIpv6Offset(pbHdrs, pGso->offHdr1),
636	cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_TCP),
637	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType);
638	break;
639	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
640	pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbPayload, 0, pGso->cbHdrsTotal);
641	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pgmNetGsoCalcIpv6Offset(pbHdrs, pGso->offHdr1),
642	cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_UDP),
643	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType);
644	break;
645	case PDMNETWORKGSOTYPE_INVALID:
646	case PDMNETWORKGSOTYPE_END:
647	/* no default! wnat gcc warnings. */
648	break;
649	}
650	}
651
652
653	/**
654	* Gets the GSO type name string.
655	*
656	* @returns Pointer to read only name string.
657	* @param enmType The type.
658	*/
659	DECLINLINE(const char *) PDMNetGsoTypeName(PDMNETWORKGSOTYPE enmType)
660	{
661	switch (enmType)
662	{
663	case PDMNETWORKGSOTYPE_IPV4_TCP: return "TCPv4";
664	case PDMNETWORKGSOTYPE_IPV6_TCP: return "TCPv6";
665	case PDMNETWORKGSOTYPE_IPV4_UDP: return "UDPv4";
666	case PDMNETWORKGSOTYPE_IPV6_UDP: return "UDPv6";
667	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP: return "4to6TCP";
668	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP: return "4to6UDP";
669	case PDMNETWORKGSOTYPE_INVALID: return "invalid";
670	case PDMNETWORKGSOTYPE_END: return "end";
671	}
672	return "bad-gso-type";
673	}
674
675	/** @} */
676
677	#endif /* !VBOX_INCLUDED_vmm_pdmnetinline_h */
678

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source: vbox/trunk/include/VBox/vmm/pdmnetinline.h@ 78415

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