pdmnetinline.h@ 69206

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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) 2010-2017 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_vmm_pdmnetinline_h_
30	#define ___VBox_vmm_pdmnetinline_h_
31
32
33	/*******************************************************************************
34	* Header Files *
35	*******************************************************************************/
36	#include <VBox/log.h>
37	#include <VBox/types.h>
38	#include <iprt/asm.h>
39	#include <iprt/assert.h>
40	#include <iprt/net.h>
41	#include <iprt/string.h>
42
43
44	/** @defgroup grp_pdm_net_inline The PDM Networking Helper APIs
45	* @ingroup grp_pdm
46	* @{
47	*/
48
49
50	/**
51	* Checksum type.
52	*/
53	typedef enum PDMNETCSUMTYPE
54	{
55	/** No checksum. */
56	PDMNETCSUMTYPE_NONE = 0,
57	/** Normal TCP checksum. */
58	PDMNETCSUMTYPE_COMPLETE,
59	/** Checksum on pseudo header (used with GSO). */
60	PDMNETCSUMTYPE_PSEUDO,
61	/** The usual 32-bit hack. */
62	PDMNETCSUMTYPE_32_BIT_HACK = 0x7fffffff
63	} PDMNETCSUMTYPE;
64
65
66	/**
67	* Validates the GSO context.
68	*
69	* @returns true if valid, false if not (not asserted or logged).
70	* @param pGso The GSO context.
71	* @param cbGsoMax The max size of the GSO context.
72	* @param cbFrame The max size of the GSO frame (use to validate
73	* the MSS).
74	*/
75	DECLINLINE(bool) PDMNetGsoIsValid(PCPDMNETWORKGSO pGso, size_t cbGsoMax, size_t cbFrame)
76	{
77	PDMNETWORKGSOTYPE enmType;
78
79	if (RT_LIKELY(cbGsoMax >= sizeof(*pGso)))
80	{ /* likely */ } else return false;
81
82	enmType = (PDMNETWORKGSOTYPE)pGso->u8Type;
83	if (RT_LIKELY( enmType > PDMNETWORKGSOTYPE_INVALID && enmType < PDMNETWORKGSOTYPE_END ))
84	{ /* likely */ } else return false;
85
86	/* all types requires both headers. */
87	if (RT_LIKELY( pGso->offHdr1 >= sizeof(RTNETETHERHDR) ))
88	{ /* likely */ } else return false;
89	if (RT_LIKELY( pGso->offHdr2 > pGso->offHdr1 ))
90	{ /* likely */ } else return false;
91	if (RT_LIKELY( pGso->cbHdrsTotal > pGso->offHdr2 ))
92	{ /* likely */ } else return false;
93
94	/* min size of the 1st header(s). */
95	switch (enmType)
96	{
97	case PDMNETWORKGSOTYPE_IPV4_TCP:
98	case PDMNETWORKGSOTYPE_IPV4_UDP:
99	if (RT_LIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 >= RTNETIPV4_MIN_LEN ))
100	{ /* likely */ } else return false;
101	break;
102	case PDMNETWORKGSOTYPE_IPV6_TCP:
103	case PDMNETWORKGSOTYPE_IPV6_UDP:
104	if (RT_LIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 >= RTNETIPV6_MIN_LEN ))
105	{ /* likely */ } else return false;
106	break;
107	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
108	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
109	if (RT_LIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 >= RTNETIPV4_MIN_LEN + RTNETIPV6_MIN_LEN ))
110	{ /* likely */ } else return false;
111	break;
112	case PDMNETWORKGSOTYPE_INVALID:
113	case PDMNETWORKGSOTYPE_END:
114	break;
115	/* no default case! want gcc warnings. */
116	}
117
118	/* min size of the 2nd header. */
119	switch (enmType)
120	{
121	case PDMNETWORKGSOTYPE_IPV4_TCP:
122	case PDMNETWORKGSOTYPE_IPV6_TCP:
123	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
124	if (RT_LIKELY( (unsigned)pGso->cbHdrsTotal - pGso->offHdr2 >= RTNETTCP_MIN_LEN ))
125	{ /* likely */ } else return false;
126	break;
127	case PDMNETWORKGSOTYPE_IPV4_UDP:
128	case PDMNETWORKGSOTYPE_IPV6_UDP:
129	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
130	if (RT_LIKELY( (unsigned)pGso->cbHdrsTotal - pGso->offHdr2 >= RTNETUDP_MIN_LEN ))
131	{ /* likely */ } else return false;
132	break;
133	case PDMNETWORKGSOTYPE_INVALID:
134	case PDMNETWORKGSOTYPE_END:
135	break;
136	/* no default case! want gcc warnings. */
137	}
138
139	/* There must be at more than one segment. */
140	if (RT_LIKELY( cbFrame > pGso->cbHdrsTotal ))
141	{ /* likely */ } else return false;
142	if (RT_LIKELY( cbFrame - pGso->cbHdrsTotal >= pGso->cbMaxSeg ))
143	{ /* likely */ } else return false;
144
145	return true;
146	}
147
148
149	/**
150	* Returns the length of header for a particular segment/fragment.
151	*
152	* We cannot simply treat UDP header as a part of payload because we do not
153	* want to modify the payload but still need to modify the checksum field in
154	* UDP header. So we want to include UDP header when calculating the length
155	* of headers in the first segment getting it copied to a temporary buffer
156	* along with other headers.
157	*
158	* @returns Length of headers (including UDP header for the first fragment).
159	* @param pGso The GSO context.
160	* @param iSeg The segment index.
161	*/
162	DECLINLINE(uint8_t) pdmNetSegHdrLen(PCPDMNETWORKGSO pGso, uint32_t iSeg)
163	{
164	return iSeg ? pGso->cbHdrsSeg : pGso->cbHdrsTotal;
165	}
166
167	/**
168	* Returns the length of payload for a particular segment/fragment.
169	*
170	* The first segment does not contain UDP header. The size of UDP header is
171	* determined as the difference between the total headers size and the size
172	* used during segmentation.
173	*
174	* @returns Length of payload (including UDP header for the first fragment).
175	* @param pGso The GSO context.
176	* @param iSeg The segment that we're carving out (0-based).
177	* @param cSegs The number of segments in the GSO frame.
178	* @param cbFrame The size of the GSO frame.
179	*/
180	DECLINLINE(uint32_t) pdmNetSegPayloadLen(PCPDMNETWORKGSO pGso, uint32_t iSeg, uint32_t cSegs, uint32_t cbFrame)
181	{
182	if (iSeg + 1 == cSegs)
183	return cbFrame - iSeg * pGso->cbMaxSeg - pdmNetSegHdrLen(pGso, iSeg);
184	return pGso->cbMaxSeg - (iSeg ? 0 : pGso->cbHdrsTotal - pGso->cbHdrsSeg);
185	}
186
187	/**
188	* Calculates the number of segments a GSO frame will be segmented into.
189	*
190	* @returns Segment count.
191	* @param pGso The GSO context.
192	* @param cbFrame The GSO frame size (header proto + payload).
193	*/
194	DECLINLINE(uint32_t) PDMNetGsoCalcSegmentCount(PCPDMNETWORKGSO pGso, size_t cbFrame)
195	{
196	size_t cbPayload;
197	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
198	cbPayload = cbFrame - pGso->cbHdrsSeg;
199	return (uint32_t)((cbPayload + pGso->cbMaxSeg - 1) / pGso->cbMaxSeg);
200	}
201
202
203	/**
204	* Used to find the IPv6 header when handling 4to6 tunneling.
205	*
206	* @returns Offset of the IPv6 header.
207	* @param pbSegHdrs The headers / frame start.
208	* @param offIPv4Hdr The offset of the IPv4 header.
209	*/
210	DECLINLINE(uint8_t) pgmNetGsoCalcIpv6Offset(uint8_t *pbSegHdrs, uint8_t offIPv4Hdr)
211	{
212	PCRTNETIPV4 pIPv4Hdr = (PCRTNETIPV4)&pbSegHdrs[offIPv4Hdr];
213	return offIPv4Hdr + pIPv4Hdr->ip_hl * 4;
214	}
215
216
217	/**
218	* Update an UDP header after carving out a segment
219	*
220	* @param u32PseudoSum The pseudo checksum.
221	* @param pbSegHdrs Pointer to the header bytes / frame start.
222	* @param offUdpHdr The offset into @a pbSegHdrs of the UDP header.
223	* @param pbPayload Pointer to the payload bytes.
224	* @param cbPayload The amount of payload.
225	* @param cbHdrs The size of all the headers.
226	* @param enmCsumType Whether to checksum the payload, the pseudo
227	* header or nothing.
228	* @internal
229	*/
230	DECLINLINE(void) pdmNetGsoUpdateUdpHdr(uint32_t u32PseudoSum, uint8_t *pbSegHdrs, uint8_t offUdpHdr,
231	uint8_t const *pbPayload, uint32_t cbPayload, uint8_t cbHdrs,
232	PDMNETCSUMTYPE enmCsumType)
233	{
234	PRTNETUDP pUdpHdr = (PRTNETUDP)&pbSegHdrs[offUdpHdr];
235	pUdpHdr->uh_ulen = RT_H2N_U16(cbPayload + cbHdrs - offUdpHdr);
236	switch (enmCsumType)
237	{
238	case PDMNETCSUMTYPE_NONE:
239	pUdpHdr->uh_sum = 0;
240	break;
241	case PDMNETCSUMTYPE_COMPLETE:
242	pUdpHdr->uh_sum = RTNetUDPChecksum(u32PseudoSum, pUdpHdr);
243	break;
244	case PDMNETCSUMTYPE_PSEUDO:
245	pUdpHdr->uh_sum = ~RTNetIPv4FinalizeChecksum(u32PseudoSum);
246	break;
247	default:
248	NOREF(pbPayload);
249	AssertFailed();
250	break;
251	}
252	}
253
254
255	/**
256	* Update an UDP header after carving out an IP fragment
257	*
258	* @param u32PseudoSum The pseudo checksum.
259	* @param pbSegHdrs Pointer to the header bytes copy
260	* @param pbFrame Pointer to the frame start.
261	* @param offUdpHdr The offset into @a pbSegHdrs of the UDP header.
262	*
263	* @internal
264	*/
265	DECLINLINE(void) pdmNetGsoUpdateUdpHdrUfo(uint32_t u32PseudoSum, uint8_t pbSegHdrs, const uint8_t pbFrame, uint8_t offUdpHdr)
266	{
267	PCRTNETUDP pcUdpHdrOrig = (PCRTNETUDP)&pbFrame[offUdpHdr];
268	PRTNETUDP pUdpHdr = (PRTNETUDP)&pbSegHdrs[offUdpHdr];
269	pUdpHdr->uh_sum = RTNetUDPChecksum(u32PseudoSum, pcUdpHdrOrig);
270	}
271
272
273	/**
274	* Update a TCP header after carving out a segment.
275	*
276	* @param u32PseudoSum The pseudo checksum.
277	* @param pbSegHdrs Pointer to the header bytes / frame start.
278	* @param offTcpHdr The offset into @a pbSegHdrs of the TCP header.
279	* @param pbPayload Pointer to the payload bytes.
280	* @param cbPayload The amount of payload.
281	* @param offPayload The offset into the payload that we're splitting
282	* up. We're ASSUMING that the payload follows
283	* immediately after the TCP header w/ options.
284	* @param cbHdrs The size of all the headers.
285	* @param fLastSeg Set if this is the last segment.
286	* @param enmCsumType Whether to checksum the payload, the pseudo
287	* header or nothing.
288	* @internal
289	*/
290	DECLINLINE(void) pdmNetGsoUpdateTcpHdr(uint32_t u32PseudoSum, uint8_t *pbSegHdrs, uint8_t offTcpHdr,
291	uint8_t const *pbPayload, uint32_t cbPayload, uint32_t offPayload, uint8_t cbHdrs,
292	bool fLastSeg, PDMNETCSUMTYPE enmCsumType)
293	{
294	PRTNETTCP pTcpHdr = (PRTNETTCP)&pbSegHdrs[offTcpHdr];
295	pTcpHdr->th_seq = RT_H2N_U32(RT_N2H_U32(pTcpHdr->th_seq) + offPayload);
296	if (!fLastSeg)
297	pTcpHdr->th_flags &= ~(RTNETTCP_F_FIN \| RTNETTCP_F_PSH);
298	switch (enmCsumType)
299	{
300	case PDMNETCSUMTYPE_NONE:
301	pTcpHdr->th_sum = 0;
302	break;
303	case PDMNETCSUMTYPE_COMPLETE:
304	pTcpHdr->th_sum = RTNetTCPChecksum(u32PseudoSum, pTcpHdr, pbPayload, cbPayload);
305	break;
306	case PDMNETCSUMTYPE_PSEUDO:
307	pTcpHdr->th_sum = ~RTNetIPv4FinalizeChecksum(u32PseudoSum);
308	break;
309	default:
310	NOREF(cbHdrs);
311	AssertFailed();
312	break;
313	}
314	}
315
316
317	/**
318	* Updates a IPv6 header after carving out a segment.
319	*
320	* @returns 32-bit intermediary checksum value for the pseudo header.
321	* @param pbSegHdrs Pointer to the header bytes.
322	* @param offIpHdr The offset into @a pbSegHdrs of the IP header.
323	* @param cbSegPayload The amount of segmented payload. Not to be
324	* confused with the IP payload.
325	* @param cbHdrs The size of all the headers.
326	* @param offPktHdr Offset of the protocol packet header. For the
327	* pseudo header checksum calulation.
328	* @param bProtocol The protocol type. For the pseudo header.
329	* @internal
330	*/
331	DECLINLINE(uint32_t) pdmNetGsoUpdateIPv6Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload, uint8_t cbHdrs,
332	uint8_t offPktHdr, uint8_t bProtocol)
333	{
334	PRTNETIPV6 pIpHdr = (PRTNETIPV6)&pbSegHdrs[offIpHdr];
335	uint16_t cbPayload = (uint16_t)(cbHdrs - (offIpHdr + sizeof(RTNETIPV6)) + cbSegPayload);
336	pIpHdr->ip6_plen = RT_H2N_U16(cbPayload);
337	return RTNetIPv6PseudoChecksumEx(pIpHdr, bProtocol, (uint16_t)(cbHdrs - offPktHdr + cbSegPayload));
338	}
339
340
341	/**
342	* Updates a IPv4 header after carving out a segment.
343	*
344	* @returns 32-bit intermediary checksum value for the pseudo header.
345	* @param pbSegHdrs Pointer to the header bytes.
346	* @param offIpHdr The offset into @a pbSegHdrs of the IP header.
347	* @param cbSegPayload The amount of segmented payload.
348	* @param iSeg The segment index.
349	* @param cbHdrs The size of all the headers.
350	* @internal
351	*/
352	DECLINLINE(uint32_t) pdmNetGsoUpdateIPv4Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload,
353	uint32_t iSeg, uint8_t cbHdrs)
354	{
355	PRTNETIPV4 pIpHdr = (PRTNETIPV4)&pbSegHdrs[offIpHdr];
356	pIpHdr->ip_len = RT_H2N_U16(cbHdrs - offIpHdr + cbSegPayload);
357	pIpHdr->ip_id = RT_H2N_U16(RT_N2H_U16(pIpHdr->ip_id) + iSeg);
358	pIpHdr->ip_sum = RTNetIPv4HdrChecksum(pIpHdr);
359	return RTNetIPv4PseudoChecksum(pIpHdr);
360	}
361
362
363	/**
364	* Updates a IPv4 header after carving out an IP fragment.
365	*
366	* @param pbSegHdrs Pointer to the header bytes.
367	* @param offIpHdr The offset into @a pbSegHdrs of the IP header.
368	* @param cbSegPayload The amount of segmented payload.
369	* @param offFragment The offset of this fragment for reassembly.
370	* @param cbHdrs The size of all the headers.
371	* @param fLastFragment True if this is the last fragment of datagram.
372	* @internal
373	*/
374	DECLINLINE(void) pdmNetGsoUpdateIPv4HdrUfo(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload,
375	uint32_t offFragment, uint8_t cbHdrs, bool fLastFragment)
376	{
377	PRTNETIPV4 pIpHdr = (PRTNETIPV4)&pbSegHdrs[offIpHdr];
378	pIpHdr->ip_len = RT_H2N_U16(cbHdrs - offIpHdr + cbSegPayload);
379	pIpHdr->ip_off = RT_H2N_U16((offFragment / 8) \| (fLastFragment ? 0 : RTNETIPV4_FLAGS_MF));
380	pIpHdr->ip_sum = RTNetIPv4HdrChecksum(pIpHdr);
381	}
382
383
384	/**
385	* Carves out the specified segment in a destructive manner.
386	*
387	* This is for sequentially carving out segments and pushing them along for
388	* processing or sending. To avoid allocating a temporary buffer for
389	* constructing the segment in, we trash the previous frame by putting the
390	* header at the end of it.
391	*
392	* @returns Pointer to the segment frame that we've carved out.
393	* @param pGso The GSO context data.
394	* @param pbFrame Pointer to the GSO frame.
395	* @param cbFrame The size of the GSO frame.
396	* @param pbHdrScatch Pointer to a pGso->cbHdrs sized area where we
397	* can save the original header prototypes on the
398	* first call (@a iSeg is 0) and retrieve it on
399	* susequent calls. (Just use a 256 bytes
400	* buffer to make life easy.)
401	* @param iSeg The segment that we're carving out (0-based).
402	* @param cSegs The number of segments in the GSO frame. Use
403	* PDMNetGsoCalcSegmentCount to find this.
404	* @param pcbSegFrame Where to return the size of the returned segment
405	* frame.
406	*/
407	DECLINLINE(void ) PDMNetGsoCarveSegmentQD(PCPDMNETWORKGSO pGso, uint8_t pbFrame, size_t cbFrame, uint8_t *pbHdrScatch,
408	uint32_t iSeg, uint32_t cSegs, uint32_t *pcbSegFrame)
409	{
410	/*
411	* Figure out where the payload is and where the header starts before we
412	* do the protocol specific carving.
413	*/
414	uint8_t * const pbSegHdrs = pbFrame + pGso->cbMaxSeg * iSeg;
415	uint8_t * const pbSegPayload = pbSegHdrs + pGso->cbHdrsSeg;
416	uint32_t const cbSegPayload = pdmNetSegPayloadLen(pGso, iSeg, cSegs, (uint32_t)cbFrame);
417	uint32_t const cbSegFrame = cbSegPayload + pGso->cbHdrsSeg;
418
419	/*
420	* Check assumptions (doing it after declaring the variables because of C).
421	*/
422	Assert(iSeg < cSegs);
423	Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame));
424	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
425
426	/*
427	* Copy the header and do the protocol specific massaging of it.
428	*/
429	if (iSeg != 0)
430	memcpy(pbSegHdrs, pbHdrScatch, pGso->cbHdrsSeg);
431	else
432	memcpy(pbHdrScatch, pbSegHdrs, pGso->cbHdrsSeg); /* There is no need to save UDP header */
433
434	switch ((PDMNETWORKGSOTYPE)pGso->u8Type)
435	{
436	case PDMNETWORKGSOTYPE_IPV4_TCP:
437	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg),
438	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
439	pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
440	break;
441	case PDMNETWORKGSOTYPE_IPV4_UDP:
442	if (iSeg == 0)
443	pdmNetGsoUpdateUdpHdrUfo(RTNetIPv4PseudoChecksum((PRTNETIPV4)&pbFrame[pGso->offHdr1]),
444	pbSegHdrs, pbFrame, pGso->offHdr2);
445	pdmNetGsoUpdateIPv4HdrUfo(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg * pGso->cbMaxSeg,
446	pdmNetSegHdrLen(pGso, iSeg), iSeg + 1 == cSegs);
447	break;
448	case PDMNETWORKGSOTYPE_IPV6_TCP:
449	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrsSeg,
450	pGso->offHdr2, RTNETIPV4_PROT_TCP),
451	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
452	pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
453	break;
454	case PDMNETWORKGSOTYPE_IPV6_UDP:
455	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrsSeg,
456	pGso->offHdr2, RTNETIPV4_PROT_UDP),
457	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrsSeg, PDMNETCSUMTYPE_COMPLETE);
458	break;
459	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
460	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg);
461	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
462	cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_TCP),
463	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
464	pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
465	break;
466	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
467	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg);
468	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
469	cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_UDP),
470	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrsSeg, PDMNETCSUMTYPE_COMPLETE);
471	break;
472	case PDMNETWORKGSOTYPE_INVALID:
473	case PDMNETWORKGSOTYPE_END:
474	/* no default! wnat gcc warnings. */
475	break;
476	}
477
478	*pcbSegFrame = cbSegFrame;
479	return pbSegHdrs;
480	}
481
482
483	/**
484	* Carves out the specified segment in a non-destructive manner.
485	*
486	* The segment headers and segment payload is kept separate here. The GSO frame
487	* is still expected to be one linear chunk of data, but we don't modify any of
488	* it.
489	*
490	* @returns The offset into the GSO frame of the payload.
491	* @param pGso The GSO context data.
492	* @param pbFrame Pointer to the GSO frame. Used for retrieving
493	* the header prototype and for checksumming the
494	* payload. The buffer is not modified.
495	* @param cbFrame The size of the GSO frame.
496	* @param iSeg The segment that we're carving out (0-based).
497	* @param cSegs The number of segments in the GSO frame. Use
498	* PDMNetGsoCalcSegmentCount to find this.
499	* @param pbSegHdrs Where to return the headers for the segment
500	* that's been carved out. The buffer must be at
501	* least pGso->cbHdrs in size, using a 256 byte
502	* buffer is a recommended simplification.
503	* @param pcbSegHdrs Where to return the size of the returned
504	* segment headers.
505	* @param pcbSegPayload Where to return the size of the returned
506	* segment payload.
507	*/
508	DECLINLINE(uint32_t) PDMNetGsoCarveSegment(PCPDMNETWORKGSO pGso, const uint8_t *pbFrame, size_t cbFrame,
509	uint32_t iSeg, uint32_t cSegs, uint8_t *pbSegHdrs,
510	uint32_t pcbSegHdrs, uint32_t pcbSegPayload)
511	{
512	/*
513	* Figure out where the payload is and where the header starts before we
514	* do the protocol specific carving.
515	*/
516	uint32_t const cbSegHdrs = pdmNetSegHdrLen(pGso, iSeg);
517	uint8_t const * const pbSegPayload = pbFrame + cbSegHdrs + iSeg * pGso->cbMaxSeg;
518	uint32_t const cbSegPayload = pdmNetSegPayloadLen(pGso, iSeg, cSegs, (uint32_t)cbFrame);
519
520	/*
521	* Check assumptions (doing it after declaring the variables because of C).
522	*/
523	Assert(iSeg < cSegs);
524	Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame));
525	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
526
527	/*
528	* Copy the header and do the protocol specific massaging of it.
529	*/
530	memcpy(pbSegHdrs, pbFrame, pGso->cbHdrsTotal); /* include UDP header */
531
532	switch ((PDMNETWORKGSOTYPE)pGso->u8Type)
533	{
534	case PDMNETWORKGSOTYPE_IPV4_TCP:
535	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs),
536	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
537	cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
538	break;
539	case PDMNETWORKGSOTYPE_IPV4_UDP:
540	if (iSeg == 0)
541	pdmNetGsoUpdateUdpHdrUfo(RTNetIPv4PseudoChecksum((PRTNETIPV4)&pbFrame[pGso->offHdr1]),
542	pbSegHdrs, pbFrame, pGso->offHdr2);
543	pdmNetGsoUpdateIPv4HdrUfo(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg * pGso->cbMaxSeg,
544	cbSegHdrs, iSeg + 1 == cSegs);
545	break;
546	case PDMNETWORKGSOTYPE_IPV6_TCP:
547	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, cbSegHdrs,
548	pGso->offHdr2, RTNETIPV4_PROT_TCP),
549	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
550	cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
551	break;
552	case PDMNETWORKGSOTYPE_IPV6_UDP:
553	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, cbSegHdrs,
554	pGso->offHdr2, RTNETIPV4_PROT_UDP),
555	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, cbSegHdrs, PDMNETCSUMTYPE_COMPLETE);
556	break;
557	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
558	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs);
559	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
560	cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_TCP),
561	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
562	cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
563	break;
564	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
565	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs);
566	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
567	cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_UDP),
568	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, cbSegHdrs, PDMNETCSUMTYPE_COMPLETE);
569	break;
570	case PDMNETWORKGSOTYPE_INVALID:
571	case PDMNETWORKGSOTYPE_END:
572	/* no default! wnat gcc warnings. */
573	break;
574	}
575
576	*pcbSegHdrs = cbSegHdrs;
577	*pcbSegPayload = cbSegPayload;
578	return cbSegHdrs + iSeg * pGso->cbMaxSeg;
579	}
580
581
582	/**
583	* Prepares the GSO frame for direct use without any segmenting.
584	*
585	* @param pGso The GSO context.
586	* @param pvFrame The frame to prepare.
587	* @param cbFrame The frame size.
588	* @param enmCsumType Whether to checksum the payload, the pseudo
589	* header or nothing.
590	*/
591	DECLINLINE(void) PDMNetGsoPrepForDirectUse(PCPDMNETWORKGSO pGso, void *pvFrame, size_t cbFrame, PDMNETCSUMTYPE enmCsumType)
592	{
593	/*
594	* Figure out where the payload is and where the header starts before we
595	* do the protocol bits.
596	*/
597	uint8_t * const pbHdrs = (uint8_t *)pvFrame;
598	uint8_t * const pbPayload = pbHdrs + pGso->cbHdrsTotal;
599	uint32_t const cbFrame32 = (uint32_t)cbFrame;
600	uint32_t const cbPayload = cbFrame32 - pGso->cbHdrsTotal;
601
602	/*
603	* Check assumptions (doing it after declaring the variables because of C).
604	*/
605	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
606
607	/*
608	* Get down to busienss.
609	*/
610	switch ((PDMNETWORKGSOTYPE)pGso->u8Type)
611	{
612	case PDMNETWORKGSOTYPE_IPV4_TCP:
613	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbFrame32 - pGso->cbHdrsTotal, 0, pGso->cbHdrsTotal),
614	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType);
615	break;
616	case PDMNETWORKGSOTYPE_IPV4_UDP:
617	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbFrame32 - pGso->cbHdrsTotal, 0, pGso->cbHdrsTotal),
618	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType);
619	break;
620	case PDMNETWORKGSOTYPE_IPV6_TCP:
621	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pGso->offHdr1, cbPayload, pGso->cbHdrsTotal,
622	pGso->offHdr2, RTNETIPV4_PROT_TCP),
623	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType);
624	break;
625	case PDMNETWORKGSOTYPE_IPV6_UDP:
626	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pGso->offHdr1, cbPayload, pGso->cbHdrsTotal,
627	pGso->offHdr2, RTNETIPV4_PROT_UDP),
628	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType);
629	break;
630	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
631	pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbPayload, 0, pGso->cbHdrsTotal);
632	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pgmNetGsoCalcIpv6Offset(pbHdrs, pGso->offHdr1),
633	cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_TCP),
634	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType);
635	break;
636	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
637	pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbPayload, 0, pGso->cbHdrsTotal);
638	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pgmNetGsoCalcIpv6Offset(pbHdrs, pGso->offHdr1),
639	cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_UDP),
640	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType);
641	break;
642	case PDMNETWORKGSOTYPE_INVALID:
643	case PDMNETWORKGSOTYPE_END:
644	/* no default! wnat gcc warnings. */
645	break;
646	}
647	}
648
649
650	/**
651	* Gets the GSO type name string.
652	*
653	* @returns Pointer to read only name string.
654	* @param enmType The type.
655	*/
656	DECLINLINE(const char *) PDMNetGsoTypeName(PDMNETWORKGSOTYPE enmType)
657	{
658	switch (enmType)
659	{
660	case PDMNETWORKGSOTYPE_IPV4_TCP: return "TCPv4";
661	case PDMNETWORKGSOTYPE_IPV6_TCP: return "TCPv6";
662	case PDMNETWORKGSOTYPE_IPV4_UDP: return "UDPv4";
663	case PDMNETWORKGSOTYPE_IPV6_UDP: return "UDPv6";
664	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP: return "4to6TCP";
665	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP: return "4to6UDP";
666	case PDMNETWORKGSOTYPE_INVALID: return "invalid";
667	case PDMNETWORKGSOTYPE_END: return "end";
668	}
669	return "bad-gso-type";
670	}
671
672	/** @} */
673
674	#endif
675

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source: vbox/trunk/include/VBox/vmm/pdmnetinline.h@ 69206

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