pdmnetinline.h@ 52664

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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) 2010-2011 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
30	/*******************************************************************************
31	* Header Files *
32	*******************************************************************************/
33	#include <VBox/log.h>
34	#include <VBox/types.h>
35	#include <iprt/asm.h>
36	#include <iprt/assert.h>
37	#include <iprt/net.h>
38	#include <iprt/string.h>
39
40
41	/**
42	* Checksum type.
43	*/
44	typedef enum PDMNETCSUMTYPE
45	{
46	/** No checksum. */
47	PDMNETCSUMTYPE_NONE = 0,
48	/** Normal TCP checksum. */
49	PDMNETCSUMTYPE_COMPLETE,
50	/** Checksum on pseudo header (used with GSO). */
51	PDMNETCSUMTYPE_PSEUDO,
52	/** The usual 32-bit hack. */
53	PDMNETCSUMTYPE_32_BIT_HACK = 0x7fffffff
54	} PDMNETCSUMTYPE;
55
56
57	/**
58	* Validates the GSO context.
59	*
60	* @returns true if valid, false if not (not asserted or logged).
61	* @param pGso The GSO context.
62	* @param cbGsoMax The max size of the GSO context.
63	* @param cbFrame The max size of the GSO frame (use to validate
64	* the MSS).
65	*/
66	DECLINLINE(bool) PDMNetGsoIsValid(PCPDMNETWORKGSO pGso, size_t cbGsoMax, size_t cbFrame)
67	{
68	PDMNETWORKGSOTYPE enmType;
69
70	if (RT_UNLIKELY(cbGsoMax < sizeof(*pGso)))
71	return false;
72
73	enmType = (PDMNETWORKGSOTYPE)pGso->u8Type;
74	if (RT_UNLIKELY( enmType <= PDMNETWORKGSOTYPE_INVALID \|\| enmType >= PDMNETWORKGSOTYPE_END ))
75	return false;
76
77	/* all types requires both headers. */
78	if (RT_UNLIKELY( pGso->offHdr1 < sizeof(RTNETETHERHDR) ))
79	return false;
80	if (RT_UNLIKELY( pGso->offHdr2 <= pGso->offHdr1 ))
81	return false;
82	if (RT_UNLIKELY( pGso->cbHdrsTotal <= pGso->offHdr2 ))
83	return false;
84
85	/* min size of the 1st header(s). */
86	switch (enmType)
87	{
88	case PDMNETWORKGSOTYPE_IPV4_TCP:
89	case PDMNETWORKGSOTYPE_IPV4_UDP:
90	if (RT_UNLIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 < RTNETIPV4_MIN_LEN ))
91	return false;
92	break;
93	case PDMNETWORKGSOTYPE_IPV6_TCP:
94	case PDMNETWORKGSOTYPE_IPV6_UDP:
95	if (RT_UNLIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 < RTNETIPV6_MIN_LEN ))
96	return false;
97	break;
98	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
99	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
100	if (RT_UNLIKELY( (unsigned)pGso->offHdr2 - pGso->offHdr1 < RTNETIPV4_MIN_LEN + RTNETIPV6_MIN_LEN ))
101	return false;
102	break;
103	case PDMNETWORKGSOTYPE_INVALID:
104	case PDMNETWORKGSOTYPE_END:
105	break;
106	/* no default case! want gcc warnings. */
107	}
108
109	/* min size of the 2nd header. */
110	switch (enmType)
111	{
112	case PDMNETWORKGSOTYPE_IPV4_TCP:
113	case PDMNETWORKGSOTYPE_IPV6_TCP:
114	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
115	if (RT_UNLIKELY( (unsigned)pGso->cbHdrsTotal - pGso->offHdr2 < RTNETTCP_MIN_LEN ))
116	return false;
117	break;
118	case PDMNETWORKGSOTYPE_IPV4_UDP:
119	case PDMNETWORKGSOTYPE_IPV6_UDP:
120	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
121	if (RT_UNLIKELY( (unsigned)pGso->cbHdrsTotal - pGso->offHdr2 < RTNETUDP_MIN_LEN ))
122	return false;
123	break;
124	case PDMNETWORKGSOTYPE_INVALID:
125	case PDMNETWORKGSOTYPE_END:
126	break;
127	/* no default case! want gcc warnings. */
128	}
129
130	/* There must be at more than one segment. */
131	if (RT_UNLIKELY( cbFrame <= pGso->cbHdrsTotal ))
132	return false;
133	if (RT_UNLIKELY( cbFrame - pGso->cbHdrsTotal < pGso->cbMaxSeg ))
134	return false;
135
136	return true;
137	}
138
139
140	/**
141	* Returns the length of header for a particular segment/fragment.
142	*
143	* We cannot simply treat UDP header as a part of payload because we do not
144	* want to modify the payload but still need to modify the checksum field in
145	* UDP header. So we want to include UDP header when calculating the length
146	* of headers in the first segment getting it copied to a temporary buffer
147	* along with other headers.
148	*
149	* @returns Length of headers (including UDP header for the first fragment).
150	* @param pGso The GSO context.
151	* @param iSeg The segment index.
152	*/
153	DECLINLINE(uint8_t) pdmNetSegHdrLen(PCPDMNETWORKGSO pGso, uint32_t iSeg)
154	{
155	return iSeg ? pGso->cbHdrsSeg : pGso->cbHdrsTotal;
156	}
157
158	/**
159	* Returns the length of payload for a particular segment/fragment.
160	*
161	* The first segment does not contain UDP header. The size of UDP header is
162	* determined as the difference between the total headers size and the size
163	* used during segmentation.
164	*
165	* @returns Length of payload (including UDP header for the first fragment).
166	* @param pGso The GSO context.
167	* @param iSeg The segment that we're carving out (0-based).
168	* @param cSegs The number of segments in the GSO frame.
169	* @param cbFrame The size of the GSO frame.
170	*/
171	DECLINLINE(uint32_t) pdmNetSegPayloadLen(PCPDMNETWORKGSO pGso, uint32_t iSeg, uint32_t cSegs, uint32_t cbFrame)
172	{
173	if (iSeg + 1 == cSegs)
174	return cbFrame - iSeg * pGso->cbMaxSeg - pdmNetSegHdrLen(pGso, iSeg);
175	else
176	return pGso->cbMaxSeg - (iSeg ? 0 : pGso->cbHdrsTotal - pGso->cbHdrsSeg);
177	}
178
179	/**
180	* Calculates the number of segments a GSO frame will be segmented into.
181	*
182	* @returns Segment count.
183	* @param pGso The GSO context.
184	* @param cbFrame The GSO frame size (header proto + payload).
185	*/
186	DECLINLINE(uint32_t) PDMNetGsoCalcSegmentCount(PCPDMNETWORKGSO pGso, size_t cbFrame)
187	{
188	size_t cbPayload;
189	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
190	cbPayload = cbFrame - pGso->cbHdrsSeg;
191	return (uint32_t)((cbPayload + pGso->cbMaxSeg - 1) / pGso->cbMaxSeg);
192	}
193
194
195	/**
196	* Used to find the IPv6 header when handling 4to6 tunneling.
197	*
198	* @returns Offset of the IPv6 header.
199	* @param pbSegHdrs The headers / frame start.
200	* @param offIpHdr The offset of the IPv4 header.
201	*/
202	DECLINLINE(uint8_t) pgmNetGsoCalcIpv6Offset(uint8_t *pbSegHdrs, uint8_t offIPv4Hdr)
203	{
204	PCRTNETIPV4 pIPv4Hdr = (PCRTNETIPV4)&pbSegHdrs[offIPv4Hdr];
205	return offIPv4Hdr + pIPv4Hdr->ip_hl * 4;
206	}
207
208
209	/**
210	* Update an UDP header after carving out a segment
211	*
212	* @param u32PseudoSum The pseudo checksum.
213	* @param pbSegHdrs Pointer to the header bytes / frame start.
214	* @param offUdpHdr The offset into @a pbSegHdrs of the UDP header.
215	* @param pbPayload Pointer to the payload bytes.
216	* @param cbPayload The amount of payload.
217	* @param cbHdrs The size of all the headers.
218	* @param enmCsumType Whether to checksum the payload, the pseudo
219	* header or nothing.
220	* @internal
221	*/
222	DECLINLINE(void) pdmNetGsoUpdateUdpHdr(uint32_t u32PseudoSum, uint8_t *pbSegHdrs, uint8_t offUdpHdr,
223	uint8_t const *pbPayload, uint32_t cbPayload, uint8_t cbHdrs,
224	PDMNETCSUMTYPE enmCsumType)
225	{
226	PRTNETUDP pUdpHdr = (PRTNETUDP)&pbSegHdrs[offUdpHdr];
227	pUdpHdr->uh_ulen = RT_H2N_U16(cbPayload + cbHdrs - offUdpHdr);
228	switch (enmCsumType)
229	{
230	case PDMNETCSUMTYPE_NONE:
231	pUdpHdr->uh_sum = 0;
232	break;
233	case PDMNETCSUMTYPE_COMPLETE:
234	pUdpHdr->uh_sum = RTNetUDPChecksum(u32PseudoSum, pUdpHdr);
235	break;
236	case PDMNETCSUMTYPE_PSEUDO:
237	pUdpHdr->uh_sum = ~RTNetIPv4FinalizeChecksum(u32PseudoSum);
238	break;
239	default:
240	NOREF(pbPayload);
241	AssertFailed();
242	break;
243	}
244	}
245
246
247	/**
248	* Update an UDP header after carving out an IP fragment
249	*
250	* @param u32PseudoSum The pseudo checksum.
251	* @param pbSegHdrs Pointer to the header bytes copy
252	* @param pbFrame Pointer to the frame start.
253	* @param offUdpHdr The offset into @a pbSegHdrs of the UDP header.
254	*
255	* @internal
256	*/
257	DECLINLINE(void) pdmNetGsoUpdateUdpHdrUfo(uint32_t u32PseudoSum, uint8_t pbSegHdrs, const uint8_t pbFrame, uint8_t offUdpHdr)
258	{
259	PCRTNETUDP pcUdpHdrOrig = (PCRTNETUDP)&pbFrame[offUdpHdr];
260	PRTNETUDP pUdpHdr = (PRTNETUDP)&pbSegHdrs[offUdpHdr];
261	pUdpHdr->uh_sum = RTNetUDPChecksum(u32PseudoSum, pcUdpHdrOrig);
262	}
263
264
265	/**
266	* Update a TCP header after carving out a segment.
267	*
268	* @param u32PseudoSum The pseudo checksum.
269	* @param pbSegHdrs Pointer to the header bytes / frame start.
270	* @param offTcpHdr The offset into @a pbSegHdrs of the TCP header.
271	* @param pbPayload Pointer to the payload bytes.
272	* @param cbPayload The amount of payload.
273	* @param offPayload The offset into the payload that we're splitting
274	* up. We're ASSUMING that the payload follows
275	* immediately after the TCP header w/ options.
276	* @param cbHdrs The size of all the headers.
277	* @param fLastSeg Set if this is the last segment.
278	* @param enmCsumType Whether to checksum the payload, the pseudo
279	* header or nothing.
280	* @internal
281	*/
282	DECLINLINE(void) pdmNetGsoUpdateTcpHdr(uint32_t u32PseudoSum, uint8_t *pbSegHdrs, uint8_t offTcpHdr,
283	uint8_t const *pbPayload, uint32_t cbPayload, uint32_t offPayload, uint8_t cbHdrs,
284	bool fLastSeg, PDMNETCSUMTYPE enmCsumType)
285	{
286	PRTNETTCP pTcpHdr = (PRTNETTCP)&pbSegHdrs[offTcpHdr];
287	pTcpHdr->th_seq = RT_H2N_U32(RT_N2H_U32(pTcpHdr->th_seq) + offPayload);
288	if (!fLastSeg)
289	pTcpHdr->th_flags &= ~(RTNETTCP_F_FIN \| RTNETTCP_F_PSH);
290	switch (enmCsumType)
291	{
292	case PDMNETCSUMTYPE_NONE:
293	pTcpHdr->th_sum = 0;
294	break;
295	case PDMNETCSUMTYPE_COMPLETE:
296	pTcpHdr->th_sum = RTNetTCPChecksum(u32PseudoSum, pTcpHdr, pbPayload, cbPayload);
297	break;
298	case PDMNETCSUMTYPE_PSEUDO:
299	pTcpHdr->th_sum = ~RTNetIPv4FinalizeChecksum(u32PseudoSum);
300	break;
301	default:
302	NOREF(cbHdrs);
303	AssertFailed();
304	break;
305	}
306	}
307
308
309	/**
310	* Updates a IPv6 header after carving out a segment.
311	*
312	* @returns 32-bit intermediary checksum value for the pseudo header.
313	* @param pbSegHdrs Pointer to the header bytes.
314	* @param offIpHdr The offset into @a pbSegHdrs of the IP header.
315	* @param cbSegPayload The amount of segmented payload. Not to be
316	* confused with the IP payload.
317	* @param cbHdrs The size of all the headers.
318	* @param offPktHdr Offset of the protocol packet header. For the
319	* pseudo header checksum calulation.
320	* @param bProtocol The protocol type. For the pseudo header.
321	* @internal
322	*/
323	DECLINLINE(uint32_t) pdmNetGsoUpdateIPv6Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload, uint8_t cbHdrs,
324	uint8_t offPktHdr, uint8_t bProtocol)
325	{
326	PRTNETIPV6 pIpHdr = (PRTNETIPV6)&pbSegHdrs[offIpHdr];
327	uint16_t cbPayload = (uint16_t)(cbHdrs - (offIpHdr + sizeof(RTNETIPV6)) + cbSegPayload);
328	pIpHdr->ip6_plen = RT_H2N_U16(cbPayload);
329	return RTNetIPv6PseudoChecksumEx(pIpHdr, bProtocol, (uint16_t)(cbHdrs - offPktHdr + cbSegPayload));
330	}
331
332
333	/**
334	* Updates a IPv4 header after carving out a segment.
335	*
336	* @returns 32-bit intermediary checksum value for the pseudo header.
337	* @param pbSegHdrs Pointer to the header bytes.
338	* @param offIpHdr The offset into @a pbSegHdrs of the IP header.
339	* @param cbSegPayload The amount of segmented payload.
340	* @param iSeg The segment index.
341	* @param cbHdrs The size of all the headers.
342	* @internal
343	*/
344	DECLINLINE(uint32_t) pdmNetGsoUpdateIPv4Hdr(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload,
345	uint32_t iSeg, uint8_t cbHdrs)
346	{
347	PRTNETIPV4 pIpHdr = (PRTNETIPV4)&pbSegHdrs[offIpHdr];
348	pIpHdr->ip_len = RT_H2N_U16(cbHdrs - offIpHdr + cbSegPayload);
349	pIpHdr->ip_id = RT_H2N_U16(RT_N2H_U16(pIpHdr->ip_id) + iSeg);
350	pIpHdr->ip_sum = RTNetIPv4HdrChecksum(pIpHdr);
351	return RTNetIPv4PseudoChecksum(pIpHdr);
352	}
353
354
355	/**
356	* Updates a IPv4 header after carving out an IP fragment.
357	*
358	* @param pbSegHdrs Pointer to the header bytes.
359	* @param offIpHdr The offset into @a pbSegHdrs of the IP header.
360	* @param cbSegPayload The amount of segmented payload.
361	* @param offFragment The offset of this fragment for reassembly.
362	* @param iSeg The segment index.
363	* @param cbHdrs The size of all the headers.
364	* @param fLastFragment True if this is the last fragment of datagram.
365	* @internal
366	*/
367	DECLINLINE(void) pdmNetGsoUpdateIPv4HdrUfo(uint8_t *pbSegHdrs, uint8_t offIpHdr, uint32_t cbSegPayload,
368	uint32_t offFragment, uint8_t cbHdrs, bool fLastFragment)
369	{
370	PRTNETIPV4 pIpHdr = (PRTNETIPV4)&pbSegHdrs[offIpHdr];
371	pIpHdr->ip_len = RT_H2N_U16(cbHdrs - offIpHdr + cbSegPayload);
372	pIpHdr->ip_off = RT_H2N_U16((offFragment / 8) \| (fLastFragment ? 0 : RTNETIPV4_FLAGS_MF));
373	pIpHdr->ip_sum = RTNetIPv4HdrChecksum(pIpHdr);
374	}
375
376
377	/**
378	* Carves out the specified segment in a destructive manner.
379	*
380	* This is for sequentially carving out segments and pushing them along for
381	* processing or sending. To avoid allocating a temporary buffer for
382	* constructing the segment in, we trash the previous frame by putting the
383	* header at the end of it.
384	*
385	* @returns Pointer to the segment frame that we've carved out.
386	* @param pGso The GSO context data.
387	* @param pbFrame Pointer to the GSO frame.
388	* @param cbFrame The size of the GSO frame.
389	* @param pbHdrScatch Pointer to a pGso->cbHdrs sized area where we
390	* can save the original header prototypes on the
391	* first call (@a iSeg is 0) and retrieve it on
392	* susequent calls. (Just use a 256 bytes
393	* buffer to make life easy.)
394	* @param iSeg The segment that we're carving out (0-based).
395	* @param cSegs The number of segments in the GSO frame. Use
396	* PDMNetGsoCalcSegmentCount to find this.
397	* @param pcbSegFrame Where to return the size of the returned segment
398	* frame.
399	*/
400	DECLINLINE(void ) PDMNetGsoCarveSegmentQD(PCPDMNETWORKGSO pGso, uint8_t pbFrame, size_t cbFrame, uint8_t *pbHdrScatch,
401	uint32_t iSeg, uint32_t cSegs, uint32_t *pcbSegFrame)
402	{
403	/*
404	* Figure out where the payload is and where the header starts before we
405	* do the protocol specific carving.
406	*/
407	uint8_t * const pbSegHdrs = pbFrame + pGso->cbMaxSeg * iSeg;
408	uint8_t * const pbSegPayload = pbSegHdrs + pGso->cbHdrsSeg;
409	uint32_t const cbSegPayload = pdmNetSegPayloadLen(pGso, iSeg, cSegs, (uint32_t)cbFrame);
410	uint32_t const cbSegFrame = cbSegPayload + pGso->cbHdrsSeg;
411
412	/*
413	* Check assumptions (doing it after declaring the variables because of C).
414	*/
415	Assert(iSeg < cSegs);
416	Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame));
417	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
418
419	/*
420	* Copy the header and do the protocol specific massaging of it.
421	*/
422	if (iSeg != 0)
423	memcpy(pbSegHdrs, pbHdrScatch, pGso->cbHdrsSeg);
424	else
425	memcpy(pbHdrScatch, pbSegHdrs, pGso->cbHdrsSeg); /* There is no need to save UDP header */
426
427	switch ((PDMNETWORKGSOTYPE)pGso->u8Type)
428	{
429	case PDMNETWORKGSOTYPE_IPV4_TCP:
430	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg),
431	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
432	pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
433	break;
434	case PDMNETWORKGSOTYPE_IPV4_UDP:
435	if (iSeg == 0)
436	pdmNetGsoUpdateUdpHdrUfo(RTNetIPv4PseudoChecksum((PRTNETIPV4)&pbFrame[pGso->offHdr1]),
437	pbSegHdrs, pbFrame, pGso->offHdr2);
438	pdmNetGsoUpdateIPv4HdrUfo(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg * pGso->cbMaxSeg,
439	pdmNetSegHdrLen(pGso, iSeg), iSeg + 1 == cSegs);
440	break;
441	case PDMNETWORKGSOTYPE_IPV6_TCP:
442	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrsSeg,
443	pGso->offHdr2, RTNETIPV4_PROT_TCP),
444	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
445	pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
446	break;
447	case PDMNETWORKGSOTYPE_IPV6_UDP:
448	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, pGso->cbHdrsSeg,
449	pGso->offHdr2, RTNETIPV4_PROT_UDP),
450	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrsSeg, PDMNETCSUMTYPE_COMPLETE);
451	break;
452	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
453	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg);
454	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
455	cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_TCP),
456	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
457	pGso->cbHdrsSeg, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
458	break;
459	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
460	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, pGso->cbHdrsSeg);
461	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
462	cbSegPayload, pGso->cbHdrsSeg, pGso->offHdr2, RTNETIPV4_PROT_UDP),
463	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, pGso->cbHdrsSeg, PDMNETCSUMTYPE_COMPLETE);
464	break;
465	case PDMNETWORKGSOTYPE_INVALID:
466	case PDMNETWORKGSOTYPE_END:
467	/* no default! wnat gcc warnings. */
468	break;
469	}
470
471	*pcbSegFrame = cbSegFrame;
472	return pbSegHdrs;
473	}
474
475
476	/**
477	* Carves out the specified segment in a non-destructive manner.
478	*
479	* The segment headers and segment payload is kept separate here. The GSO frame
480	* is still expected to be one linear chunk of data, but we don't modify any of
481	* it.
482	*
483	* @returns The offset into the GSO frame of the payload.
484	* @param pGso The GSO context data.
485	* @param pbFrame Pointer to the GSO frame. Used for retrieving
486	* the header prototype and for checksumming the
487	* payload. The buffer is not modified.
488	* @param cbFrame The size of the GSO frame.
489	* @param iSeg The segment that we're carving out (0-based).
490	* @param cSegs The number of segments in the GSO frame. Use
491	* PDMNetGsoCalcSegmentCount to find this.
492	* @param pbSegHdrs Where to return the headers for the segment
493	* that's been carved out. The buffer must be at
494	* least pGso->cbHdrs in size, using a 256 byte
495	* buffer is a recommended simplification.
496	* @param pcbSegHdrs Where to return the size of the returned
497	* segment headers.
498	* @param pcbSegPayload Where to return the size of the returned
499	* segment payload.
500	*/
501	DECLINLINE(uint32_t) PDMNetGsoCarveSegment(PCPDMNETWORKGSO pGso, const uint8_t *pbFrame, size_t cbFrame,
502	uint32_t iSeg, uint32_t cSegs, uint8_t *pbSegHdrs,
503	uint32_t pcbSegHdrs, uint32_t pcbSegPayload)
504	{
505	/*
506	* Figure out where the payload is and where the header starts before we
507	* do the protocol specific carving.
508	*/
509	uint32_t const cbSegHdrs = pdmNetSegHdrLen(pGso, iSeg);
510	uint8_t const * const pbSegPayload = pbFrame + cbSegHdrs + iSeg * pGso->cbMaxSeg;
511	uint32_t const cbSegPayload = pdmNetSegPayloadLen(pGso, iSeg, cSegs, (uint32_t)cbFrame);
512
513	/*
514	* Check assumptions (doing it after declaring the variables because of C).
515	*/
516	Assert(iSeg < cSegs);
517	Assert(cSegs == PDMNetGsoCalcSegmentCount(pGso, cbFrame));
518	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
519
520	/*
521	* Copy the header and do the protocol specific massaging of it.
522	*/
523	memcpy(pbSegHdrs, pbFrame, pGso->cbHdrsTotal); /* include UDP header */
524
525	switch ((PDMNETWORKGSOTYPE)pGso->u8Type)
526	{
527	case PDMNETWORKGSOTYPE_IPV4_TCP:
528	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs),
529	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
530	cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
531	break;
532	case PDMNETWORKGSOTYPE_IPV4_UDP:
533	if (iSeg == 0)
534	pdmNetGsoUpdateUdpHdrUfo(RTNetIPv4PseudoChecksum((PRTNETIPV4)&pbFrame[pGso->offHdr1]),
535	pbSegHdrs, pbFrame, pGso->offHdr2);
536	pdmNetGsoUpdateIPv4HdrUfo(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg * pGso->cbMaxSeg,
537	cbSegHdrs, iSeg + 1 == cSegs);
538	break;
539	case PDMNETWORKGSOTYPE_IPV6_TCP:
540	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, cbSegHdrs,
541	pGso->offHdr2, RTNETIPV4_PROT_TCP),
542	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
543	cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
544	break;
545	case PDMNETWORKGSOTYPE_IPV6_UDP:
546	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, cbSegHdrs,
547	pGso->offHdr2, RTNETIPV4_PROT_UDP),
548	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, cbSegHdrs, PDMNETCSUMTYPE_COMPLETE);
549	break;
550	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
551	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs);
552	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
553	cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_TCP),
554	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, iSeg * pGso->cbMaxSeg,
555	cbSegHdrs, iSeg + 1 == cSegs, PDMNETCSUMTYPE_COMPLETE);
556	break;
557	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
558	pdmNetGsoUpdateIPv4Hdr(pbSegHdrs, pGso->offHdr1, cbSegPayload, iSeg, cbSegHdrs);
559	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbSegHdrs, pgmNetGsoCalcIpv6Offset(pbSegHdrs, pGso->offHdr1),
560	cbSegPayload, cbSegHdrs, pGso->offHdr2, RTNETIPV4_PROT_UDP),
561	pbSegHdrs, pGso->offHdr2, pbSegPayload, cbSegPayload, cbSegHdrs, PDMNETCSUMTYPE_COMPLETE);
562	break;
563	case PDMNETWORKGSOTYPE_INVALID:
564	case PDMNETWORKGSOTYPE_END:
565	/* no default! wnat gcc warnings. */
566	break;
567	}
568
569	*pcbSegHdrs = cbSegHdrs;
570	*pcbSegPayload = cbSegPayload;
571	return cbSegHdrs + iSeg * pGso->cbMaxSeg;
572	}
573
574
575	/**
576	* Prepares the GSO frame for direct use without any segmenting.
577	*
578	* @param pGso The GSO context.
579	* @param pvFrame The frame to prepare.
580	* @param cbFrame The frame size.
581	* @param enmCsumType Whether to checksum the payload, the pseudo
582	* header or nothing.
583	*/
584	DECLINLINE(void) PDMNetGsoPrepForDirectUse(PCPDMNETWORKGSO pGso, void *pvFrame, size_t cbFrame, PDMNETCSUMTYPE enmCsumType)
585	{
586	/*
587	* Figure out where the payload is and where the header starts before we
588	* do the protocol bits.
589	*/
590	uint8_t * const pbHdrs = (uint8_t *)pvFrame;
591	uint8_t * const pbPayload = pbHdrs + pGso->cbHdrsTotal;
592	uint32_t const cbFrame32 = (uint32_t)cbFrame;
593	uint32_t const cbPayload = cbFrame32 - pGso->cbHdrsTotal;
594
595	/*
596	* Check assumptions (doing it after declaring the variables because of C).
597	*/
598	Assert(PDMNetGsoIsValid(pGso, sizeof(*pGso), cbFrame));
599
600	/*
601	* Get down to busienss.
602	*/
603	switch ((PDMNETWORKGSOTYPE)pGso->u8Type)
604	{
605	case PDMNETWORKGSOTYPE_IPV4_TCP:
606	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbFrame32 - pGso->cbHdrsTotal, 0, pGso->cbHdrsTotal),
607	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType);
608	break;
609	case PDMNETWORKGSOTYPE_IPV4_UDP:
610	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbFrame32 - pGso->cbHdrsTotal, 0, pGso->cbHdrsTotal),
611	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType);
612	break;
613	case PDMNETWORKGSOTYPE_IPV6_TCP:
614	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pGso->offHdr1, cbPayload, pGso->cbHdrsTotal,
615	pGso->offHdr2, RTNETIPV4_PROT_TCP),
616	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType);
617	break;
618	case PDMNETWORKGSOTYPE_IPV6_UDP:
619	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pGso->offHdr1, cbPayload, pGso->cbHdrsTotal,
620	pGso->offHdr2, RTNETIPV4_PROT_UDP),
621	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType);
622	break;
623	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP:
624	pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbPayload, 0, pGso->cbHdrsTotal);
625	pdmNetGsoUpdateTcpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pgmNetGsoCalcIpv6Offset(pbHdrs, pGso->offHdr1),
626	cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_TCP),
627	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, 0, pGso->cbHdrsTotal, true, enmCsumType);
628	break;
629	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP:
630	pdmNetGsoUpdateIPv4Hdr(pbHdrs, pGso->offHdr1, cbPayload, 0, pGso->cbHdrsTotal);
631	pdmNetGsoUpdateUdpHdr(pdmNetGsoUpdateIPv6Hdr(pbHdrs, pgmNetGsoCalcIpv6Offset(pbHdrs, pGso->offHdr1),
632	cbPayload, pGso->cbHdrsTotal, pGso->offHdr2, RTNETIPV4_PROT_UDP),
633	pbHdrs, pGso->offHdr2, pbPayload, cbPayload, pGso->cbHdrsTotal, enmCsumType);
634	break;
635	case PDMNETWORKGSOTYPE_INVALID:
636	case PDMNETWORKGSOTYPE_END:
637	/* no default! wnat gcc warnings. */
638	break;
639	}
640	}
641
642
643	/**
644	* Gets the GSO type name string.
645	*
646	* @returns Pointer to read only name string.
647	* @param enmType The type.
648	*/
649	DECLINLINE(const char *) PDMNetGsoTypeName(PDMNETWORKGSOTYPE enmType)
650	{
651	switch (enmType)
652	{
653	case PDMNETWORKGSOTYPE_IPV4_TCP: return "TCPv4";
654	case PDMNETWORKGSOTYPE_IPV6_TCP: return "TCPv6";
655	case PDMNETWORKGSOTYPE_IPV4_UDP: return "UDPv4";
656	case PDMNETWORKGSOTYPE_IPV6_UDP: return "UDPv6";
657	case PDMNETWORKGSOTYPE_IPV4_IPV6_TCP: return "4to6TCP";
658	case PDMNETWORKGSOTYPE_IPV4_IPV6_UDP: return "4to6UDP";
659	case PDMNETWORKGSOTYPE_INVALID: return "invalid";
660	case PDMNETWORKGSOTYPE_END: return "end";
661	}
662	return "bad-gso-type";
663	}
664

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source: vbox/trunk/include/VBox/vmm/pdmnetinline.h@ 52664

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