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cbf316f2 | 1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2005 - 2006, Intel Corporation\r | |
4 | All rights reserved. This program and the accompanying materials\r | |
5 | are licensed and made available under the terms and conditions of the BSD License\r | |
6 | which accompanies this distribution. The full text of the license may be found at\r | |
7 | http://opensource.org/licenses/bsd-license.php\r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | NetBuffer.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | \r | |
19 | \r | |
20 | **/\r | |
21 | \r | |
22 | #include <PiDxe.h> | |
23 | ||
24 | #include <Library/NetLib.h> | |
25 | #include <Library/BaseLib.h> | |
26 | #include <Library/DebugLib.h> | |
27 | #include <Library/BaseMemoryLib.h> | |
28 | #include <Library/UefiBootServicesTableLib.h> | |
29 | #include <Library/MemoryAllocationLib.h>\r | |
30 | \r | |
31 | \r | |
32 | /**\r | |
33 | Allocate and build up the sketch for a NET_BUF. The net buffer allocated\r | |
34 | has the BlockOpNum's NET_BLOCK_OP, and its associated NET_VECTOR has the\r | |
35 | BlockNum's NET_BLOCK.\r | |
36 | \r | |
37 | @param BlockNum The number of NET_BLOCK in the Vector of net buffer\r | |
38 | @param BlockOpNum The number of NET_BLOCK_OP in the net buffer\r | |
39 | \r | |
40 | @retval * Pointer to the allocated NET_BUF. If NULL the\r | |
41 | allocation failed due to resource limit.\r | |
42 | \r | |
43 | **/\r | |
44 | STATIC\r | |
45 | NET_BUF *\r | |
46 | NetbufAllocStruct (\r | |
47 | IN UINT32 BlockNum,\r | |
48 | IN UINT32 BlockOpNum\r | |
49 | )\r | |
50 | {\r | |
51 | NET_BUF *Nbuf;\r | |
52 | NET_VECTOR *Vector;\r | |
53 | \r | |
54 | ASSERT (BlockOpNum >= 1);\r | |
55 | \r | |
56 | //\r | |
57 | // Allocate three memory blocks.\r | |
58 | //\r | |
59 | Nbuf = NetAllocateZeroPool (NET_BUF_SIZE (BlockOpNum));\r | |
60 | \r | |
61 | if (Nbuf == NULL) {\r | |
62 | return NULL;\r | |
63 | }\r | |
64 | \r | |
65 | Nbuf->Signature = NET_BUF_SIGNATURE;\r | |
66 | Nbuf->RefCnt = 1;\r | |
67 | Nbuf->BlockOpNum = BlockOpNum;\r | |
68 | NetListInit (&Nbuf->List);\r | |
69 | \r | |
70 | if (BlockNum != 0) {\r | |
71 | Vector = NetAllocateZeroPool (NET_VECTOR_SIZE (BlockNum));\r | |
72 | \r | |
73 | if (Vector == NULL) {\r | |
74 | goto FreeNbuf;\r | |
75 | }\r | |
76 | \r | |
77 | Vector->Signature = NET_VECTOR_SIGNATURE;\r | |
78 | Vector->RefCnt = 1;\r | |
79 | Vector->BlockNum = BlockNum;\r | |
80 | Nbuf->Vector = Vector;\r | |
81 | }\r | |
82 | \r | |
83 | return Nbuf;\r | |
84 | \r | |
85 | FreeNbuf:\r | |
86 | \r | |
87 | NetFreePool (Nbuf);\r | |
88 | return NULL;\r | |
89 | }\r | |
90 | \r | |
91 | \r | |
92 | /**\r | |
93 | Allocate a single block NET_BUF. Upon allocation, all the\r | |
94 | free space is in the tail room.\r | |
95 | \r | |
96 | @param Len The length of the block.\r | |
97 | \r | |
98 | @retval * Pointer to the allocated NET_BUF. If NULL the\r | |
99 | allocation failed due to resource limit.\r | |
100 | \r | |
101 | **/\r | |
102 | NET_BUF *\r | |
103 | NetbufAlloc (\r | |
104 | IN UINT32 Len\r | |
105 | )\r | |
106 | {\r | |
107 | NET_BUF *Nbuf;\r | |
108 | NET_VECTOR *Vector;\r | |
109 | UINT8 *Bulk;\r | |
110 | \r | |
111 | ASSERT (Len > 0);\r | |
112 | \r | |
113 | Nbuf = NetbufAllocStruct (1, 1);\r | |
114 | \r | |
115 | if (Nbuf == NULL) {\r | |
116 | return NULL;\r | |
117 | }\r | |
118 | \r | |
119 | Bulk = NetAllocatePool (Len);\r | |
120 | \r | |
121 | if (Bulk == NULL) {\r | |
122 | goto FreeNBuf;\r | |
123 | }\r | |
124 | \r | |
125 | Vector = Nbuf->Vector;\r | |
126 | Vector->Len = Len;\r | |
127 | \r | |
128 | Vector->Block[0].Bulk = Bulk;\r | |
129 | Vector->Block[0].Len = Len;\r | |
130 | \r | |
131 | Nbuf->BlockOp[0].BlockHead = Bulk;\r | |
132 | Nbuf->BlockOp[0].BlockTail = Bulk + Len;\r | |
133 | \r | |
134 | Nbuf->BlockOp[0].Head = Bulk;\r | |
135 | Nbuf->BlockOp[0].Tail = Bulk;\r | |
136 | Nbuf->BlockOp[0].Size = 0;\r | |
137 | \r | |
138 | return Nbuf;\r | |
139 | \r | |
140 | FreeNBuf:\r | |
141 | NetFreePool (Nbuf);\r | |
142 | return NULL;\r | |
143 | }\r | |
144 | \r | |
145 | \r | |
146 | /**\r | |
147 | Free the vector\r | |
148 | \r | |
149 | @param Vector Pointer to the NET_VECTOR to be freed.\r | |
150 | \r | |
151 | @return None.\r | |
152 | \r | |
153 | **/\r | |
154 | STATIC\r | |
155 | VOID\r | |
156 | NetbufFreeVector (\r | |
157 | IN NET_VECTOR *Vector\r | |
158 | )\r | |
159 | {\r | |
160 | UINT32 Index;\r | |
161 | \r | |
162 | NET_CHECK_SIGNATURE (Vector, NET_VECTOR_SIGNATURE);\r | |
163 | ASSERT (Vector->RefCnt > 0);\r | |
164 | \r | |
165 | Vector->RefCnt--;\r | |
166 | \r | |
167 | if (Vector->RefCnt > 0) {\r | |
168 | return;\r | |
169 | }\r | |
170 | \r | |
171 | if (Vector->Free != NULL) {\r | |
172 | //\r | |
173 | // Call external free function to free the vector if it\r | |
174 | // isn't NULL. If NET_VECTOR_OWN_FIRST is set, release the\r | |
175 | // first block since it is allocated by us\r | |
176 | //\r | |
177 | if (Vector->Flag & NET_VECTOR_OWN_FIRST) {\r | |
178 | NetFreePool (Vector->Block[0].Bulk);\r | |
179 | }\r | |
180 | \r | |
181 | Vector->Free (Vector->Arg);\r | |
182 | \r | |
183 | } else {\r | |
184 | //\r | |
185 | // Free each memory block associated with the Vector\r | |
186 | //\r | |
187 | for (Index = 0; Index < Vector->BlockNum; Index++) {\r | |
188 | NetFreePool (Vector->Block[Index].Bulk);\r | |
189 | }\r | |
190 | }\r | |
191 | \r | |
192 | NetFreePool (Vector);\r | |
193 | }\r | |
194 | \r | |
195 | \r | |
196 | /**\r | |
197 | Free the buffer and its associated NET_VECTOR.\r | |
198 | \r | |
199 | @param Nbuf Pointer to the NET_BUF to be freed.\r | |
200 | \r | |
201 | @return None.\r | |
202 | \r | |
203 | **/\r | |
204 | VOID\r | |
205 | NetbufFree (\r | |
206 | IN NET_BUF *Nbuf\r | |
207 | )\r | |
208 | {\r | |
209 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
210 | ASSERT (Nbuf->RefCnt > 0);\r | |
211 | \r | |
212 | Nbuf->RefCnt--;\r | |
213 | \r | |
214 | if (Nbuf->RefCnt == 0) {\r | |
215 | //\r | |
216 | // Update Vector only when NBuf is to be released. That is,\r | |
217 | // all the sharing of Nbuf increse Vector's RefCnt by one\r | |
218 | //\r | |
219 | NetbufFreeVector (Nbuf->Vector);\r | |
220 | NetFreePool (Nbuf);\r | |
221 | }\r | |
222 | }\r | |
223 | \r | |
224 | \r | |
225 | /**\r | |
226 | Create a copy of NET_BUF that share the associated NET_DATA.\r | |
227 | \r | |
228 | @param Nbuf Pointer to the net buffer to be cloned.\r | |
229 | \r | |
230 | @retval * Pointer to the cloned net buffer.\r | |
231 | \r | |
232 | **/\r | |
233 | NET_BUF *\r | |
234 | NetbufClone (\r | |
235 | IN NET_BUF *Nbuf\r | |
236 | )\r | |
237 | {\r | |
238 | NET_BUF *Clone;\r | |
239 | \r | |
240 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
241 | \r | |
242 | Clone = NetAllocatePool (NET_BUF_SIZE (Nbuf->BlockOpNum));\r | |
243 | \r | |
244 | if (Clone == NULL) {\r | |
245 | return NULL;\r | |
246 | }\r | |
247 | \r | |
248 | Clone->Signature = NET_BUF_SIGNATURE;\r | |
249 | Clone->RefCnt = 1;\r | |
250 | NetListInit (&Clone->List);\r | |
251 | \r | |
252 | Clone->Ip = Nbuf->Ip;\r | |
253 | Clone->Tcp = Nbuf->Tcp;\r | |
254 | \r | |
255 | NetCopyMem (Clone->ProtoData, Nbuf->ProtoData, NET_PROTO_DATA);\r | |
256 | \r | |
257 | NET_GET_REF (Nbuf->Vector);\r | |
258 | \r | |
259 | Clone->Vector = Nbuf->Vector;\r | |
260 | Clone->BlockOpNum = Nbuf->BlockOpNum;\r | |
261 | Clone->TotalSize = Nbuf->TotalSize;\r | |
262 | NetCopyMem (Clone->BlockOp, Nbuf->BlockOp, sizeof (NET_BLOCK_OP) * Nbuf->BlockOpNum);\r | |
263 | \r | |
264 | return Clone;\r | |
265 | }\r | |
266 | \r | |
267 | \r | |
268 | /**\r | |
269 | Create a duplicated copy of Nbuf, data is copied. Also leave some\r | |
270 | head space before the data.\r | |
271 | \r | |
272 | @param Nbuf Pointer to the net buffer to be cloned.\r | |
273 | @param Duplicate Pointer to the net buffer to duplicate to, if NULL\r | |
274 | a new net buffer is allocated.\r | |
275 | @param HeadSpace Length of the head space to reserve\r | |
276 | \r | |
277 | @retval * Pointer to the duplicated net buffer.\r | |
278 | \r | |
279 | **/\r | |
280 | NET_BUF *\r | |
281 | NetbufDuplicate (\r | |
282 | IN NET_BUF *Nbuf,\r | |
283 | IN NET_BUF *Duplicate OPTIONAL,\r | |
284 | IN UINT32 HeadSpace\r | |
285 | )\r | |
286 | {\r | |
287 | UINT8 *Dst;\r | |
288 | \r | |
289 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
290 | \r | |
291 | if (Duplicate == NULL) {\r | |
292 | Duplicate = NetbufAlloc (Nbuf->TotalSize + HeadSpace);\r | |
293 | }\r | |
294 | \r | |
295 | if (Duplicate == NULL) {\r | |
296 | return NULL;\r | |
297 | }\r | |
298 | \r | |
299 | //\r | |
300 | // Don't set the IP and TCP head point, since it is most\r | |
301 | // like that they are pointing to the memory of Nbuf.\r | |
302 | //\r | |
303 | NetCopyMem (Duplicate->ProtoData, Nbuf->ProtoData, NET_PROTO_DATA);\r | |
304 | NetbufReserve (Duplicate, HeadSpace);\r | |
305 | \r | |
306 | Dst = NetbufAllocSpace (Duplicate, Nbuf->TotalSize, NET_BUF_TAIL);\r | |
307 | NetbufCopy (Nbuf, 0, Nbuf->TotalSize, Dst);\r | |
308 | \r | |
309 | return Duplicate;\r | |
310 | }\r | |
311 | \r | |
312 | \r | |
313 | /**\r | |
314 | Free a list of net buffers.\r | |
315 | \r | |
316 | @param Head Pointer to the head of linked net buffers.\r | |
317 | \r | |
318 | @return None.\r | |
319 | \r | |
320 | **/\r | |
321 | VOID\r | |
322 | NetbufFreeList (\r | |
323 | IN NET_LIST_ENTRY *Head\r | |
324 | )\r | |
325 | {\r | |
326 | NET_LIST_ENTRY *Entry;\r | |
327 | NET_LIST_ENTRY *Next;\r | |
328 | NET_BUF *Nbuf;\r | |
329 | \r | |
330 | Entry = Head->ForwardLink;\r | |
331 | \r | |
332 | NET_LIST_FOR_EACH_SAFE (Entry, Next, Head) {\r | |
333 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
334 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
335 | \r | |
336 | NetListRemoveEntry (Entry);\r | |
337 | NetbufFree (Nbuf);\r | |
338 | }\r | |
339 | \r | |
340 | ASSERT (NetListIsEmpty (Head));\r | |
341 | }\r | |
342 | \r | |
343 | \r | |
344 | /**\r | |
345 | Get the position of some byte in the net buffer. This can be used\r | |
346 | to, for example, retrieve the IP header in the packet. It also\r | |
347 | returns the fragment that contains the byte which is used mainly by\r | |
348 | the buffer implementation itself.\r | |
349 | \r | |
350 | @param Nbuf Pointer to the net buffer.\r | |
351 | @param Offset The index or offset of the byte\r | |
352 | @param Index Index of the fragment that contains the block\r | |
353 | \r | |
354 | @retval * Pointer to the nth byte of data in the net buffer.\r | |
355 | If NULL, there is no such data in the net buffer.\r | |
356 | \r | |
357 | **/\r | |
358 | UINT8 *\r | |
359 | NetbufGetByte (\r | |
360 | IN NET_BUF *Nbuf,\r | |
361 | IN UINT32 Offset,\r | |
362 | OUT UINT32 *Index OPTIONAL\r | |
363 | )\r | |
364 | {\r | |
365 | NET_BLOCK_OP *BlockOp;\r | |
366 | UINT32 Loop;\r | |
367 | UINT32 Len;\r | |
368 | \r | |
369 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
370 | \r | |
371 | if (Offset >= Nbuf->TotalSize) {\r | |
372 | return NULL;\r | |
373 | }\r | |
374 | \r | |
375 | BlockOp = Nbuf->BlockOp;\r | |
376 | Len = 0;\r | |
377 | \r | |
378 | for (Loop = 0; Loop < Nbuf->BlockOpNum; Loop++) {\r | |
379 | \r | |
380 | if (Len + BlockOp[Loop].Size <= Offset) {\r | |
381 | Len += BlockOp[Loop].Size;\r | |
382 | continue;\r | |
383 | }\r | |
384 | \r | |
385 | if (Index != NULL) {\r | |
386 | *Index = Loop;\r | |
387 | }\r | |
388 | \r | |
389 | return BlockOp[Loop].Head + (Offset - Len);\r | |
390 | }\r | |
391 | \r | |
392 | return NULL;\r | |
393 | }\r | |
394 | \r | |
395 | \r | |
396 | \r | |
397 | /**\r | |
398 | Set the NET_BLOCK and corresponding NET_BLOCK_OP in\r | |
399 | the buffer. All the pointers in NET_BLOCK and NET_BLOCK_OP\r | |
400 | are set to the bulk's head and tail respectively. So, this\r | |
401 | function alone can't be used by NetbufAlloc.\r | |
402 | \r | |
403 | @param Nbuf Pointer to the net buffer.\r | |
404 | @param Bulk Pointer to the data.\r | |
405 | @param Len Length of the bulk data.\r | |
406 | @param Index The data block index in the net buffer the bulk\r | |
407 | data should belong to.\r | |
408 | \r | |
409 | @return None.\r | |
410 | \r | |
411 | **/\r | |
412 | STATIC\r | |
413 | VOID\r | |
414 | NetbufSetBlock (\r | |
415 | IN NET_BUF *Nbuf,\r | |
416 | IN UINT8 *Bulk,\r | |
417 | IN UINT32 Len,\r | |
418 | IN UINT32 Index\r | |
419 | )\r | |
420 | {\r | |
421 | NET_BLOCK_OP *BlockOp;\r | |
422 | NET_BLOCK *Block;\r | |
423 | \r | |
424 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
425 | NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);\r | |
426 | ASSERT (Index < Nbuf->BlockOpNum);\r | |
427 | \r | |
428 | Block = &(Nbuf->Vector->Block[Index]);\r | |
429 | BlockOp = &(Nbuf->BlockOp[Index]);\r | |
430 | Block->Len = Len;\r | |
431 | Block->Bulk = Bulk;\r | |
432 | BlockOp->BlockHead = Bulk;\r | |
433 | BlockOp->BlockTail = Bulk + Len;\r | |
434 | BlockOp->Head = Bulk;\r | |
435 | BlockOp->Tail = Bulk + Len;\r | |
436 | BlockOp->Size = Len;\r | |
437 | }\r | |
438 | \r | |
439 | \r | |
440 | \r | |
441 | /**\r | |
442 | Set the NET_BLOCK_OP in the buffer. The corresponding NET_BLOCK\r | |
443 | structure is left untouched. Some times, there is no 1:1 relationship\r | |
444 | between NET_BLOCK and NET_BLOCK_OP. For example, that in NetbufGetFragment.\r | |
445 | \r | |
446 | @param Nbuf Pointer to the net buffer.\r | |
447 | @param Bulk Pointer to the data.\r | |
448 | @param Len Length of the bulk data.\r | |
449 | @param Index The data block index in the net buffer the bulk\r | |
450 | data should belong to.\r | |
451 | \r | |
452 | @return None.\r | |
453 | \r | |
454 | **/\r | |
455 | STATIC\r | |
456 | VOID\r | |
457 | NetbufSetBlockOp (\r | |
458 | IN NET_BUF *Nbuf,\r | |
459 | IN UINT8 *Bulk,\r | |
460 | IN UINT32 Len,\r | |
461 | IN UINT32 Index\r | |
462 | )\r | |
463 | {\r | |
464 | NET_BLOCK_OP *BlockOp;\r | |
465 | \r | |
466 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
467 | ASSERT (Index < Nbuf->BlockOpNum);\r | |
468 | \r | |
469 | BlockOp = &(Nbuf->BlockOp[Index]);\r | |
470 | BlockOp->BlockHead = Bulk;\r | |
471 | BlockOp->BlockTail = Bulk + Len;\r | |
472 | BlockOp->Head = Bulk;\r | |
473 | BlockOp->Tail = Bulk + Len;\r | |
474 | BlockOp->Size = Len;\r | |
475 | }\r | |
476 | \r | |
477 | \r | |
478 | /**\r | |
479 | Helper function for NetbufClone. It is necessary because NetbufGetFragment\r | |
480 | may allocate the first block to accomodate the HeadSpace and HeadLen. So, it\r | |
481 | need to create a new NET_VECTOR. But, we want to avoid data copy by sharing\r | |
482 | the old NET_VECTOR.\r | |
483 | \r | |
484 | @param Arg Point to the old NET_VECTOR\r | |
485 | \r | |
486 | @return NONE\r | |
487 | \r | |
488 | **/\r | |
489 | STATIC\r | |
490 | VOID\r | |
491 | NetbufGetFragmentFree (\r | |
492 | IN VOID *Arg\r | |
493 | )\r | |
494 | {\r | |
495 | NET_VECTOR *Vector;\r | |
496 | \r | |
497 | Vector = (NET_VECTOR *)Arg;\r | |
498 | NetbufFreeVector (Vector);\r | |
499 | }\r | |
500 | \r | |
501 | \r | |
502 | \r | |
503 | /**\r | |
504 | Create a NET_BUF structure which contains Len byte data of\r | |
505 | Nbuf starting from Offset. A new NET_BUF structure will be\r | |
506 | created but the associated data in NET_VECTOR is shared.\r | |
507 | This function exists to do IP packet fragmentation.\r | |
508 | \r | |
509 | @param Nbuf Pointer to the net buffer to be cloned.\r | |
510 | @param Offset Starting point of the data to be included in new\r | |
511 | buffer.\r | |
512 | @param Len How many data to include in new data\r | |
513 | @param HeadSpace How many bytes of head space to reserve for\r | |
514 | protocol header\r | |
515 | \r | |
516 | @retval * Pointer to the cloned net buffer.\r | |
517 | \r | |
518 | **/\r | |
519 | NET_BUF *\r | |
520 | NetbufGetFragment (\r | |
521 | IN NET_BUF *Nbuf,\r | |
522 | IN UINT32 Offset,\r | |
523 | IN UINT32 Len,\r | |
524 | IN UINT32 HeadSpace\r | |
525 | )\r | |
526 | {\r | |
527 | NET_BUF *Child;\r | |
528 | NET_VECTOR *Vector;\r | |
529 | NET_BLOCK_OP *BlockOp;\r | |
530 | UINT32 CurBlockOp;\r | |
531 | UINT32 BlockOpNum;\r | |
532 | UINT8 *FirstBulk;\r | |
533 | UINT32 Index;\r | |
534 | UINT32 First;\r | |
535 | UINT32 Last;\r | |
536 | UINT32 FirstSkip;\r | |
537 | UINT32 FirstLen;\r | |
538 | UINT32 LastLen;\r | |
539 | UINT32 Cur;\r | |
540 | \r | |
541 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
542 | \r | |
543 | if ((Len == 0) || (Offset + Len > Nbuf->TotalSize)) {\r | |
544 | return NULL;\r | |
545 | }\r | |
546 | \r | |
547 | //\r | |
548 | // First find the first and last BlockOp that contains\r | |
549 | // the valid data, and compute the offset of the first\r | |
550 | // BlockOp and length of the last BlockOp\r | |
551 | //\r | |
552 | BlockOp = Nbuf->BlockOp;\r | |
553 | Cur = 0;\r | |
554 | \r | |
555 | for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {\r | |
556 | if (Offset < Cur + BlockOp[Index].Size) {\r | |
557 | break;\r | |
558 | }\r | |
559 | \r | |
560 | Cur += BlockOp[Index].Size;\r | |
561 | }\r | |
562 | \r | |
563 | //\r | |
564 | // First is the index of the first BlockOp, FirstSkip is\r | |
565 | // the offset of the first byte in the first BlockOp.\r | |
566 | //\r | |
567 | First = Index;\r | |
568 | FirstSkip = Offset - Cur;\r | |
569 | FirstLen = BlockOp[Index].Size - FirstSkip;\r | |
570 | \r | |
571 | //\r | |
572 | //redundant assignment to make compiler happy.\r | |
573 | //\r | |
574 | Last = 0;\r | |
575 | LastLen = 0;\r | |
576 | \r | |
577 | if (Len > FirstLen) {\r | |
578 | Cur += BlockOp[Index].Size;\r | |
579 | Index++;\r | |
580 | \r | |
581 | for (; Index < Nbuf->BlockOpNum; Index++) {\r | |
582 | if (Offset + Len <= Cur + BlockOp[Index].Size) {\r | |
583 | Last = Index;\r | |
584 | LastLen = Offset + Len - Cur;\r | |
585 | break;\r | |
586 | }\r | |
587 | \r | |
588 | Cur += BlockOp[Index].Size;\r | |
589 | }\r | |
590 | \r | |
591 | } else {\r | |
592 | Last = First;\r | |
593 | LastLen = Len;\r | |
594 | FirstLen = Len;\r | |
595 | }\r | |
596 | \r | |
597 | BlockOpNum = Last - First + 1;\r | |
598 | CurBlockOp = 0;\r | |
599 | \r | |
600 | if (HeadSpace != 0) {\r | |
601 | //\r | |
602 | // Allocate an extra block to accomdate the head space.\r | |
603 | //\r | |
604 | BlockOpNum++;\r | |
605 | \r | |
606 | Child = NetbufAllocStruct (1, BlockOpNum);\r | |
607 | \r | |
608 | if (Child == NULL) {\r | |
609 | return NULL;\r | |
610 | }\r | |
611 | \r | |
612 | FirstBulk = NetAllocatePool (HeadSpace);\r | |
613 | \r | |
614 | if (FirstBulk == NULL) {\r | |
615 | goto FreeChild;\r | |
616 | }\r | |
617 | \r | |
618 | Vector = Child->Vector;\r | |
619 | Vector->Free = NetbufGetFragmentFree;\r | |
620 | Vector->Arg = Nbuf->Vector;\r | |
621 | Vector->Flag = NET_VECTOR_OWN_FIRST;\r | |
622 | Vector->Len = HeadSpace;\r | |
623 | \r | |
624 | //\r | |
625 | //Reserve the head space in the first block\r | |
626 | //\r | |
627 | NetbufSetBlock (Child, FirstBulk, HeadSpace, 0);\r | |
628 | Child->BlockOp[0].Head += HeadSpace;\r | |
629 | Child->BlockOp[0].Size = 0;\r | |
630 | CurBlockOp++;\r | |
631 | \r | |
632 | }else {\r | |
633 | Child = NetbufAllocStruct (0, BlockOpNum);\r | |
634 | \r | |
635 | if (Child == NULL) {\r | |
636 | return NULL;\r | |
637 | }\r | |
638 | \r | |
639 | Child->Vector = Nbuf->Vector;\r | |
640 | }\r | |
641 | \r | |
642 | NET_GET_REF (Nbuf->Vector);\r | |
643 | Child->TotalSize = Len;\r | |
644 | \r | |
645 | //\r | |
646 | // Set all the BlockOp up, the first and last one are special\r | |
647 | // and need special process.\r | |
648 | //\r | |
649 | NetbufSetBlockOp (\r | |
650 | Child,\r | |
651 | Nbuf->BlockOp[First].Head + FirstSkip,\r | |
652 | FirstLen,\r | |
653 | CurBlockOp++\r | |
654 | );\r | |
655 | \r | |
656 | for (Index = First + 1; Index <= Last - 1 ; Index++) {\r | |
657 | NetbufSetBlockOp (\r | |
658 | Child,\r | |
659 | BlockOp[Index].Head,\r | |
660 | BlockOp[Index].Size,\r | |
661 | CurBlockOp++\r | |
662 | );\r | |
663 | }\r | |
664 | \r | |
665 | if (First != Last) {\r | |
666 | NetbufSetBlockOp (\r | |
667 | Child,\r | |
668 | BlockOp[Last].Head,\r | |
669 | LastLen,\r | |
670 | CurBlockOp\r | |
671 | );\r | |
672 | }\r | |
673 | \r | |
674 | NetCopyMem (Child->ProtoData, Nbuf->ProtoData, NET_PROTO_DATA);\r | |
675 | return Child;\r | |
676 | \r | |
677 | FreeChild:\r | |
678 | \r | |
679 | NetFreePool (Child);\r | |
680 | return NULL;\r | |
681 | }\r | |
682 | \r | |
683 | \r | |
684 | \r | |
685 | /**\r | |
686 | Build a NET_BUF from external blocks.\r | |
687 | \r | |
688 | @param ExtFragment Pointer to the data block.\r | |
689 | @param ExtNum The number of the data block.\r | |
690 | @param HeadSpace The head space to be reserved.\r | |
691 | @param HeadLen The length of the protocol header, This function\r | |
692 | will pull that number of data into a linear block.\r | |
693 | @param ExtFree Pointer to the caller provided free function.\r | |
694 | @param Arg The argument passed to ExtFree when ExtFree is\r | |
695 | called.\r | |
696 | \r | |
697 | @retval * Pointer to the net buffer built from the data\r | |
698 | blocks.\r | |
699 | \r | |
700 | **/\r | |
701 | NET_BUF *\r | |
702 | NetbufFromExt (\r | |
703 | IN NET_FRAGMENT *ExtFragment,\r | |
704 | IN UINT32 ExtNum,\r | |
705 | IN UINT32 HeadSpace,\r | |
706 | IN UINT32 HeadLen,\r | |
707 | IN NET_VECTOR_EXT_FREE ExtFree,\r | |
708 | IN VOID *Arg OPTIONAL\r | |
709 | )\r | |
710 | {\r | |
711 | NET_BUF *Nbuf;\r | |
712 | NET_VECTOR *Vector;\r | |
713 | NET_FRAGMENT SavedFragment;\r | |
714 | UINT32 SavedIndex;\r | |
715 | UINT32 TotalLen;\r | |
716 | UINT32 BlockNum;\r | |
717 | UINT8 *FirstBlock;\r | |
718 | UINT32 FirstBlockLen;\r | |
719 | UINT8 *Header;\r | |
720 | UINT32 CurBlock;\r | |
721 | UINT32 Index;\r | |
722 | UINT32 Len;\r | |
723 | UINT32 Copied;\r | |
724 | \r | |
725 | ASSERT ((ExtFragment != NULL) && (ExtNum > 0) && (ExtFree != NULL));\r | |
726 | \r | |
727 | SavedFragment.Bulk = NULL;\r | |
728 | SavedFragment.Len = 0;\r | |
729 | \r | |
730 | FirstBlockLen = 0;\r | |
731 | FirstBlock = NULL;\r | |
732 | BlockNum = ExtNum;\r | |
733 | Index = 0;\r | |
734 | TotalLen = 0;\r | |
735 | SavedIndex = 0;\r | |
736 | Len = 0;\r | |
737 | Copied = 0;\r | |
738 | \r | |
739 | //\r | |
740 | // No need to consolidate the header if the first block is\r | |
741 | // longer than the header length or there is only one block.\r | |
742 | //\r | |
743 | if ((ExtFragment[0].Len >= HeadLen) || (ExtNum == 1)) {\r | |
744 | HeadLen = 0;\r | |
745 | }\r | |
746 | \r | |
747 | //\r | |
748 | // Allocate an extra block if we need to:\r | |
749 | // 1. Allocate some header space\r | |
750 | // 2. aggreate the packet header\r | |
751 | //\r | |
752 | if ((HeadSpace != 0) || (HeadLen != 0)) {\r | |
753 | FirstBlockLen = HeadLen + HeadSpace;\r | |
754 | FirstBlock = NetAllocatePool (FirstBlockLen);\r | |
755 | \r | |
756 | if (FirstBlock == NULL) {\r | |
757 | return NULL;\r | |
758 | }\r | |
759 | \r | |
760 | BlockNum++;\r | |
761 | }\r | |
762 | \r | |
763 | //\r | |
764 | // Copy the header to the first block, reduce the NET_BLOCK\r | |
765 | // to allocate by one for each block that is completely covered\r | |
766 | // by the first bulk.\r | |
767 | //\r | |
768 | if (HeadLen != 0) {\r | |
769 | Len = HeadLen;\r | |
770 | Header = FirstBlock + HeadSpace;\r | |
771 | \r | |
772 | for (Index = 0; Index < ExtNum; Index++) {\r | |
773 | if (Len >= ExtFragment[Index].Len) {\r | |
774 | NetCopyMem (Header, ExtFragment[Index].Bulk, ExtFragment[Index].Len);\r | |
775 | \r | |
776 | Copied += ExtFragment[Index].Len;\r | |
777 | Len -= ExtFragment[Index].Len;\r | |
778 | Header += ExtFragment[Index].Len;\r | |
779 | TotalLen += ExtFragment[Index].Len;\r | |
780 | BlockNum--;\r | |
781 | \r | |
782 | if (Len == 0) {\r | |
783 | //\r | |
784 | // Increament the index number to point to the next\r | |
785 | // non-empty fragment.\r | |
786 | //\r | |
787 | Index++;\r | |
788 | break;\r | |
789 | }\r | |
790 | \r | |
791 | } else {\r | |
792 | NetCopyMem (Header, ExtFragment[Index].Bulk, Len);\r | |
793 | \r | |
794 | Copied += Len;\r | |
795 | TotalLen += Len;\r | |
796 | \r | |
797 | //\r | |
798 | // Adjust the block structure to exclude the data copied,\r | |
799 | // So, the left-over block can be processed as other blocks.\r | |
800 | // But it must be recovered later. (SavedIndex > 0) always\r | |
801 | // holds since we don't aggreate the header if the first block\r | |
802 | // is bigger enough that the header is continuous\r | |
803 | //\r | |
804 | SavedIndex = Index;\r | |
805 | SavedFragment = ExtFragment[Index];\r | |
806 | ExtFragment[Index].Bulk += Len;\r | |
807 | ExtFragment[Index].Len -= Len;\r | |
808 | break;\r | |
809 | }\r | |
810 | }\r | |
811 | }\r | |
812 | \r | |
813 | Nbuf = NetbufAllocStruct (BlockNum, BlockNum);\r | |
814 | \r | |
815 | if (Nbuf == NULL) {\r | |
816 | goto FreeFirstBlock;\r | |
817 | }\r | |
818 | \r | |
819 | Vector = Nbuf->Vector;\r | |
820 | Vector->Free = ExtFree;\r | |
821 | Vector->Arg = Arg;\r | |
822 | Vector->Flag = (FirstBlockLen ? NET_VECTOR_OWN_FIRST : 0);\r | |
823 | \r | |
824 | //\r | |
825 | // Set the first block up which may contain\r | |
826 | // some head space and aggregated header\r | |
827 | //\r | |
828 | CurBlock = 0;\r | |
829 | \r | |
830 | if (FirstBlockLen != 0) {\r | |
831 | NetbufSetBlock (Nbuf, FirstBlock, HeadSpace + Copied, 0);\r | |
832 | Nbuf->BlockOp[0].Head += HeadSpace;\r | |
833 | Nbuf->BlockOp[0].Size = Copied;\r | |
834 | \r | |
835 | CurBlock++;\r | |
836 | }\r | |
837 | \r | |
838 | for (; Index < ExtNum; Index++) {\r | |
839 | NetbufSetBlock (Nbuf, ExtFragment[Index].Bulk, ExtFragment[Index].Len, CurBlock);\r | |
840 | TotalLen += ExtFragment[Index].Len;\r | |
841 | CurBlock++;\r | |
842 | }\r | |
843 | \r | |
844 | Vector->Len = TotalLen + HeadSpace;\r | |
845 | Nbuf->TotalSize = TotalLen;\r | |
846 | \r | |
847 | if (SavedIndex) {\r | |
848 | ExtFragment[SavedIndex] = SavedFragment;\r | |
849 | }\r | |
850 | \r | |
851 | return Nbuf;\r | |
852 | \r | |
853 | FreeFirstBlock:\r | |
854 | NetFreePool (FirstBlock);\r | |
855 | return NULL;\r | |
856 | }\r | |
857 | \r | |
858 | \r | |
859 | /**\r | |
860 | Build a fragment table to contain the fragments in the\r | |
861 | buffer. This is the opposite of the NetbufFromExt.\r | |
862 | \r | |
863 | @param Nbuf Point to the net buffer\r | |
864 | @param ExtFragment Pointer to the data block.\r | |
865 | @param ExtNum The number of the data block.\r | |
866 | \r | |
867 | @retval EFI_BUFFER_TOO_SMALL The number of non-empty block is bigger than ExtNum\r | |
868 | @retval EFI_SUCCESS Fragment table built.\r | |
869 | \r | |
870 | **/\r | |
871 | EFI_STATUS\r | |
872 | NetbufBuildExt (\r | |
873 | IN NET_BUF *Nbuf,\r | |
874 | IN NET_FRAGMENT *ExtFragment,\r | |
875 | IN UINT32 *ExtNum\r | |
876 | )\r | |
877 | {\r | |
878 | UINT32 Index;\r | |
879 | UINT32 Current;\r | |
880 | \r | |
881 | Current = 0;\r | |
882 | \r | |
883 | for (Index = 0; (Index < Nbuf->BlockOpNum); Index++) {\r | |
884 | if (Nbuf->BlockOp[Index].Size == 0) {\r | |
885 | continue;\r | |
886 | }\r | |
887 | \r | |
888 | if (Current < *ExtNum) {\r | |
889 | ExtFragment[Current].Bulk = Nbuf->BlockOp[Index].Head;\r | |
890 | ExtFragment[Current].Len = Nbuf->BlockOp[Index].Size;\r | |
891 | Current++;\r | |
892 | } else {\r | |
893 | return EFI_BUFFER_TOO_SMALL;\r | |
894 | }\r | |
895 | }\r | |
896 | \r | |
897 | *ExtNum = Current;\r | |
898 | return EFI_SUCCESS;\r | |
899 | }\r | |
900 | \r | |
901 | \r | |
902 | /**\r | |
903 | Build a NET_BUF from a list of NET_BUF.\r | |
904 | \r | |
905 | @param BufList A List of NET_BUF.\r | |
906 | @param HeadSpace The head space to be reserved.\r | |
907 | @param HeaderLen The length of the protocol header, This function\r | |
908 | will pull that number of data into a linear block.\r | |
909 | @param ExtFree Pointer to the caller provided free function.\r | |
910 | @param Arg The argument passed to ExtFree when ExtFree is\r | |
911 | called.\r | |
912 | \r | |
913 | @retval * Pointer to the net buffer built from the data\r | |
914 | blocks.\r | |
915 | \r | |
916 | **/\r | |
917 | NET_BUF *\r | |
918 | NetbufFromBufList (\r | |
919 | IN NET_LIST_ENTRY *BufList,\r | |
920 | IN UINT32 HeadSpace,\r | |
921 | IN UINT32 HeaderLen,\r | |
922 | IN NET_VECTOR_EXT_FREE ExtFree,\r | |
923 | IN VOID *Arg OPTIONAL\r | |
924 | )\r | |
925 | {\r | |
926 | NET_FRAGMENT *Fragment;\r | |
927 | UINT32 FragmentNum;\r | |
928 | NET_LIST_ENTRY *Entry;\r | |
929 | NET_BUF *Nbuf;\r | |
930 | UINT32 Index;\r | |
931 | UINT32 Current;\r | |
932 | \r | |
933 | //\r | |
934 | //Compute how many blocks are there\r | |
935 | //\r | |
936 | FragmentNum = 0;\r | |
937 | \r | |
938 | NET_LIST_FOR_EACH (Entry, BufList) {\r | |
939 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
940 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
941 | FragmentNum += Nbuf->BlockOpNum;\r | |
942 | }\r | |
943 | \r | |
944 | //\r | |
945 | //Allocate and copy block points\r | |
946 | //\r | |
947 | Fragment = NetAllocatePool (sizeof (NET_FRAGMENT) * FragmentNum);\r | |
948 | \r | |
949 | if (Fragment == NULL) {\r | |
950 | return NULL;\r | |
951 | }\r | |
952 | \r | |
953 | Current = 0;\r | |
954 | \r | |
955 | NET_LIST_FOR_EACH (Entry, BufList) {\r | |
956 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
957 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
958 | \r | |
959 | for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {\r | |
960 | if (Nbuf->BlockOp[Index].Size) {\r | |
961 | Fragment[Current].Bulk = Nbuf->BlockOp[Index].Head;\r | |
962 | Fragment[Current].Len = Nbuf->BlockOp[Index].Size;\r | |
963 | Current++;\r | |
964 | }\r | |
965 | }\r | |
966 | }\r | |
967 | \r | |
968 | Nbuf = NetbufFromExt (Fragment, Current, HeadSpace, HeaderLen, ExtFree, Arg);\r | |
969 | NetFreePool (Fragment);\r | |
970 | \r | |
971 | return Nbuf;\r | |
972 | }\r | |
973 | \r | |
974 | \r | |
975 | /**\r | |
976 | Reserve some space in the header room of the buffer.\r | |
977 | Upon allocation, all the space are in the tail room\r | |
978 | of the buffer. Call this function to move some space\r | |
979 | to the header room. This function is quite limited in\r | |
980 | that it can only reserver space from the first block\r | |
981 | of an empty NET_BUF not built from the external. But\r | |
982 | it should be enough for the network stack.\r | |
983 | \r | |
984 | @param Nbuf Pointer to the net buffer.\r | |
985 | @param Len The length of buffer to be reserverd.\r | |
986 | \r | |
987 | @return None.\r | |
988 | \r | |
989 | **/\r | |
990 | VOID\r | |
991 | NetbufReserve (\r | |
992 | IN NET_BUF *Nbuf,\r | |
993 | IN UINT32 Len\r | |
994 | )\r | |
995 | {\r | |
996 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
997 | NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);\r | |
998 | \r | |
999 | ASSERT ((Nbuf->BlockOpNum == 1) && (Nbuf->TotalSize == 0));\r | |
1000 | ASSERT ((Nbuf->Vector->Free == NULL) && (Nbuf->Vector->Len >= Len));\r | |
1001 | \r | |
1002 | Nbuf->BlockOp[0].Head += Len;\r | |
1003 | Nbuf->BlockOp[0].Tail += Len;\r | |
1004 | \r | |
1005 | ASSERT (Nbuf->BlockOp[0].Tail <= Nbuf->BlockOp[0].BlockTail);\r | |
1006 | }\r | |
1007 | \r | |
1008 | \r | |
1009 | /**\r | |
1010 | Allocate some space from the header or tail of the buffer.\r | |
1011 | \r | |
1012 | @param Nbuf Pointer to the net buffer.\r | |
1013 | @param Len The length of the buffer to be allocated.\r | |
1014 | @param FromHead The flag to indicate whether reserve the data from\r | |
1015 | head or tail. TRUE for from head, and FALSE for\r | |
1016 | from tail.\r | |
1017 | \r | |
1018 | @retval * Pointer to the first byte of the allocated buffer.\r | |
1019 | \r | |
1020 | **/\r | |
1021 | UINT8 *\r | |
1022 | NetbufAllocSpace (\r | |
1023 | IN NET_BUF *Nbuf,\r | |
1024 | IN UINT32 Len,\r | |
1025 | IN BOOLEAN FromHead\r | |
1026 | )\r | |
1027 | {\r | |
1028 | NET_BLOCK_OP *BlockOp;\r | |
1029 | UINT32 Index;\r | |
1030 | UINT8 *SavedTail;\r | |
1031 | \r | |
1032 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1033 | NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);\r | |
1034 | \r | |
1035 | ASSERT (Len > 0);\r | |
1036 | \r | |
1037 | if (FromHead) {\r | |
1038 | //\r | |
1039 | // Allocate some space from head. If the buffer is empty,\r | |
1040 | // allocate from the first block. If it isn't, allocate\r | |
1041 | // from the first non-empty block, or the block before that.\r | |
1042 | //\r | |
1043 | if (Nbuf->TotalSize == 0) {\r | |
1044 | Index = 0;\r | |
1045 | } else {\r | |
1046 | NetbufGetByte (Nbuf, 0, &Index);\r | |
1047 | \r | |
1048 | if ((NET_HEADSPACE(&(Nbuf->BlockOp[Index])) < Len) && (Index > 0)) {\r | |
1049 | Index--;\r | |
1050 | }\r | |
1051 | }\r | |
1052 | \r | |
1053 | BlockOp = &(Nbuf->BlockOp[Index]);\r | |
1054 | \r | |
1055 | if (NET_HEADSPACE (BlockOp) < Len) {\r | |
1056 | return NULL;\r | |
1057 | }\r | |
1058 | \r | |
1059 | BlockOp->Head -= Len;\r | |
1060 | BlockOp->Size += Len;\r | |
1061 | Nbuf->TotalSize += Len;\r | |
1062 | \r | |
1063 | return BlockOp->Head;\r | |
1064 | \r | |
1065 | } else {\r | |
1066 | //\r | |
1067 | // Allocate some space from the tail. If the buffer is empty,\r | |
1068 | // allocate from the first block. If it isn't, allocate\r | |
1069 | // from the last non-empty block, or the block after that.\r | |
1070 | //\r | |
1071 | if (Nbuf->TotalSize == 0) {\r | |
1072 | Index = 0;\r | |
1073 | } else {\r | |
1074 | NetbufGetByte (Nbuf, Nbuf->TotalSize - 1, &Index);\r | |
1075 | \r | |
1076 | if ((NET_TAILSPACE(&(Nbuf->BlockOp[Index])) < Len) &&\r | |
1077 | (Index < Nbuf->BlockOpNum - 1)) {\r | |
1078 | \r | |
1079 | Index++;\r | |
1080 | }\r | |
1081 | }\r | |
1082 | \r | |
1083 | BlockOp = &(Nbuf->BlockOp[Index]);\r | |
1084 | \r | |
1085 | if (NET_TAILSPACE (BlockOp) < Len) {\r | |
1086 | return NULL;\r | |
1087 | }\r | |
1088 | \r | |
1089 | SavedTail = BlockOp->Tail;\r | |
1090 | \r | |
1091 | BlockOp->Tail += Len;\r | |
1092 | BlockOp->Size += Len;\r | |
1093 | Nbuf->TotalSize += Len;\r | |
1094 | \r | |
1095 | return SavedTail;\r | |
1096 | }\r | |
1097 | }\r | |
1098 | \r | |
1099 | \r | |
1100 | /**\r | |
1101 | Trim a single NET_BLOCK.\r | |
1102 | \r | |
1103 | @param BlockOp Pointer to the NET_BLOCK.\r | |
1104 | @param Len The length of the data to be trimmed.\r | |
1105 | @param FromHead The flag to indicate whether trim data from head or\r | |
1106 | tail. TRUE for from head, and FALSE for from tail.\r | |
1107 | \r | |
1108 | @return None.\r | |
1109 | \r | |
1110 | **/\r | |
1111 | STATIC\r | |
1112 | VOID\r | |
1113 | NetblockTrim (\r | |
1114 | IN NET_BLOCK_OP *BlockOp,\r | |
1115 | IN UINT32 Len,\r | |
1116 | IN BOOLEAN FromHead\r | |
1117 | )\r | |
1118 | {\r | |
1119 | ASSERT (BlockOp && (BlockOp->Size >= Len));\r | |
1120 | \r | |
1121 | BlockOp->Size -= Len;\r | |
1122 | \r | |
1123 | if (FromHead) {\r | |
1124 | BlockOp->Head += Len;\r | |
1125 | } else {\r | |
1126 | BlockOp->Tail -= Len;\r | |
1127 | }\r | |
1128 | }\r | |
1129 | \r | |
1130 | \r | |
1131 | /**\r | |
1132 | Trim some data from the header or tail of the buffer.\r | |
1133 | \r | |
1134 | @param Nbuf Pointer to the net buffer.\r | |
1135 | @param Len The length of the data to be trimmed.\r | |
1136 | @param FromHead The flag to indicate whether trim data from head or\r | |
1137 | tail. TRUE for from head, and FALSE for from tail.\r | |
1138 | \r | |
1139 | @retval UINTN Length of the actually trimmed data.\r | |
1140 | \r | |
1141 | **/\r | |
1142 | UINT32\r | |
1143 | NetbufTrim (\r | |
1144 | IN NET_BUF *Nbuf,\r | |
1145 | IN UINT32 Len,\r | |
1146 | IN BOOLEAN FromHead\r | |
1147 | )\r | |
1148 | {\r | |
1149 | NET_BLOCK_OP *BlockOp;\r | |
1150 | UINT32 Index;\r | |
1151 | UINT32 Trimmed;\r | |
1152 | \r | |
1153 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1154 | \r | |
1155 | if (Len > Nbuf->TotalSize) {\r | |
1156 | Len = Nbuf->TotalSize;\r | |
1157 | }\r | |
1158 | \r | |
1159 | //\r | |
1160 | // If FromTail is true, iterate backward. That\r | |
1161 | // is, init Index to NBuf->BlockNum - 1, and\r | |
1162 | // decrease it by 1 during each loop. Otherwise,\r | |
1163 | // iterate forward. That is, init Index to 0, and\r | |
1164 | // increase it by 1 during each loop.\r | |
1165 | //\r | |
1166 | Trimmed = 0;\r | |
1167 | Nbuf->TotalSize -= Len;\r | |
1168 | \r | |
1169 | Index = (FromHead ? 0 : Nbuf->BlockOpNum - 1);\r | |
1170 | BlockOp = Nbuf->BlockOp;\r | |
1171 | \r | |
1172 | for (;;) {\r | |
1173 | if (BlockOp[Index].Size == 0) {\r | |
1174 | Index += (FromHead ? 1 : -1);\r | |
1175 | continue;\r | |
1176 | }\r | |
1177 | \r | |
1178 | if (Len > BlockOp[Index].Size) {\r | |
1179 | Len -= BlockOp[Index].Size;\r | |
1180 | Trimmed += BlockOp[Index].Size;\r | |
1181 | NetblockTrim (&BlockOp[Index], BlockOp[Index].Size, FromHead);\r | |
1182 | } else {\r | |
1183 | Trimmed += Len;\r | |
1184 | NetblockTrim (&BlockOp[Index], Len, FromHead);\r | |
1185 | break;\r | |
1186 | }\r | |
1187 | \r | |
1188 | Index += (FromHead ? 1 : -1);\r | |
1189 | }\r | |
1190 | \r | |
1191 | return Trimmed;\r | |
1192 | }\r | |
1193 | \r | |
1194 | \r | |
1195 | /**\r | |
1196 | Copy the data from the specific offset to the destination.\r | |
1197 | \r | |
1198 | @param Nbuf Pointer to the net buffer.\r | |
1199 | @param Offset The sequence number of the first byte to copy.\r | |
1200 | @param Len Length of the data to copy.\r | |
1201 | @param Dest The destination of the data to copy to.\r | |
1202 | \r | |
1203 | @retval UINTN The length of the copied data.\r | |
1204 | \r | |
1205 | **/\r | |
1206 | UINT32\r | |
1207 | NetbufCopy (\r | |
1208 | IN NET_BUF *Nbuf,\r | |
1209 | IN UINT32 Offset,\r | |
1210 | IN UINT32 Len,\r | |
1211 | IN UINT8 *Dest\r | |
1212 | )\r | |
1213 | {\r | |
1214 | NET_BLOCK_OP *BlockOp;\r | |
1215 | UINT32 Skip;\r | |
1216 | UINT32 Left;\r | |
1217 | UINT32 Copied;\r | |
1218 | UINT32 Index;\r | |
1219 | UINT32 Cur;\r | |
1220 | \r | |
1221 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1222 | ASSERT (Dest);\r | |
1223 | \r | |
1224 | if ((Len == 0) || (Nbuf->TotalSize <= Offset)) {\r | |
1225 | return 0;\r | |
1226 | }\r | |
1227 | \r | |
1228 | if (Nbuf->TotalSize - Offset < Len) {\r | |
1229 | Len = Nbuf->TotalSize - Offset;\r | |
1230 | }\r | |
1231 | \r | |
1232 | BlockOp = Nbuf->BlockOp;\r | |
1233 | \r | |
1234 | //\r | |
1235 | // Skip to the offset. Don't make "Offset-By-One" error here.\r | |
1236 | // Cur + BLOCK.SIZE is the first sequence number of next block.\r | |
1237 | // So, (Offset < Cur + BLOCK.SIZE) means that the first byte\r | |
1238 | // is in the current block. if (Offset == Cur + BLOCK.SIZE), the\r | |
1239 | // first byte is the next block's first byte.\r | |
1240 | //\r | |
1241 | Cur = 0;\r | |
1242 | \r | |
1243 | for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {\r | |
1244 | if (BlockOp[Index].Size == 0) {\r | |
1245 | continue;\r | |
1246 | }\r | |
1247 | \r | |
1248 | if (Offset < Cur + BlockOp[Index].Size) {\r | |
1249 | break;\r | |
1250 | }\r | |
1251 | \r | |
1252 | Cur += BlockOp[Index].Size;\r | |
1253 | }\r | |
1254 | \r | |
1255 | //\r | |
1256 | // Cur is the sequence number of the first byte in the block\r | |
1257 | // Offset - Cur is the number of bytes before first byte to\r | |
1258 | // to copy in the current block.\r | |
1259 | //\r | |
1260 | Skip = Offset - Cur;\r | |
1261 | Left = BlockOp[Index].Size - Skip;\r | |
1262 | \r | |
1263 | if (Len <= Left) {\r | |
1264 | NetCopyMem (Dest, BlockOp[Index].Head + Skip, Len);\r | |
1265 | return Len;\r | |
1266 | }\r | |
1267 | \r | |
1268 | NetCopyMem (Dest, BlockOp[Index].Head + Skip, Left);\r | |
1269 | \r | |
1270 | Dest += Left;\r | |
1271 | Len -= Left;\r | |
1272 | Copied = Left;\r | |
1273 | \r | |
1274 | Index++;\r | |
1275 | \r | |
1276 | for (; Index < Nbuf->BlockOpNum; Index++) {\r | |
1277 | if (Len > BlockOp[Index].Size) {\r | |
1278 | Len -= BlockOp[Index].Size;\r | |
1279 | Copied += BlockOp[Index].Size;\r | |
1280 | \r | |
1281 | NetCopyMem (Dest, BlockOp[Index].Head, BlockOp[Index].Size);\r | |
1282 | Dest += BlockOp[Index].Size;\r | |
1283 | } else {\r | |
1284 | Copied += Len;\r | |
1285 | NetCopyMem (Dest, BlockOp[Index].Head, Len);\r | |
1286 | break;\r | |
1287 | }\r | |
1288 | }\r | |
1289 | \r | |
1290 | return Copied;\r | |
1291 | }\r | |
1292 | \r | |
1293 | \r | |
1294 | /**\r | |
1295 | Initiate the net buffer queue.\r | |
1296 | \r | |
1297 | @param NbufQue Pointer to the net buffer queue to be initiated.\r | |
1298 | \r | |
1299 | @return None.\r | |
1300 | \r | |
1301 | **/\r | |
1302 | VOID\r | |
1303 | NetbufQueInit (\r | |
1304 | IN NET_BUF_QUEUE *NbufQue\r | |
1305 | )\r | |
1306 | {\r | |
1307 | NbufQue->Signature = NET_QUE_SIGNATURE;\r | |
1308 | NbufQue->RefCnt = 1;\r | |
1309 | NetListInit (&NbufQue->List);\r | |
1310 | \r | |
1311 | NetListInit (&NbufQue->BufList);\r | |
1312 | NbufQue->BufSize = 0;\r | |
1313 | NbufQue->BufNum = 0;\r | |
1314 | }\r | |
1315 | \r | |
1316 | \r | |
1317 | /**\r | |
1318 | Allocate an initialized net buffer queue.\r | |
1319 | \r | |
1320 | None.\r | |
1321 | \r | |
1322 | @retval * Pointer to the allocated net buffer queue.\r | |
1323 | \r | |
1324 | **/\r | |
1325 | NET_BUF_QUEUE *\r | |
1326 | NetbufQueAlloc (\r | |
1327 | VOID\r | |
1328 | )\r | |
1329 | {\r | |
1330 | NET_BUF_QUEUE *NbufQue;\r | |
1331 | \r | |
1332 | NbufQue = NetAllocatePool (sizeof (NET_BUF_QUEUE));\r | |
1333 | if (NbufQue == NULL) {\r | |
1334 | return NULL;\r | |
1335 | }\r | |
1336 | \r | |
1337 | NetbufQueInit (NbufQue);\r | |
1338 | \r | |
1339 | return NbufQue;\r | |
1340 | }\r | |
1341 | \r | |
1342 | \r | |
1343 | /**\r | |
1344 | Free a net buffer queue.\r | |
1345 | \r | |
1346 | @param NbufQue Poitner to the net buffer queue to be freed.\r | |
1347 | \r | |
1348 | @return None.\r | |
1349 | \r | |
1350 | **/\r | |
1351 | VOID\r | |
1352 | NetbufQueFree (\r | |
1353 | IN NET_BUF_QUEUE *NbufQue\r | |
1354 | )\r | |
1355 | {\r | |
1356 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1357 | \r | |
1358 | NbufQue->RefCnt--;\r | |
1359 | \r | |
1360 | if (NbufQue->RefCnt == 0) {\r | |
1361 | NetbufQueFlush (NbufQue);\r | |
1362 | NetFreePool (NbufQue);\r | |
1363 | }\r | |
1364 | }\r | |
1365 | \r | |
1366 | \r | |
1367 | /**\r | |
1368 | Append a buffer to the end of the queue.\r | |
1369 | \r | |
1370 | @param NbufQue Pointer to the net buffer queue.\r | |
1371 | @param Nbuf Pointer to the net buffer to be appended.\r | |
1372 | \r | |
1373 | @return None.\r | |
1374 | \r | |
1375 | **/\r | |
1376 | VOID\r | |
1377 | NetbufQueAppend (\r | |
1378 | IN NET_BUF_QUEUE *NbufQue,\r | |
1379 | IN NET_BUF *Nbuf\r | |
1380 | )\r | |
1381 | {\r | |
1382 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1383 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1384 | \r | |
1385 | NetListInsertTail (&NbufQue->BufList, &Nbuf->List);\r | |
1386 | \r | |
1387 | NbufQue->BufSize += Nbuf->TotalSize;\r | |
1388 | NbufQue->BufNum++;\r | |
1389 | }\r | |
1390 | \r | |
1391 | \r | |
1392 | /**\r | |
1393 | Remove a net buffer from head in the specific queue.\r | |
1394 | \r | |
1395 | @param NbufQue Pointer to the net buffer queue.\r | |
1396 | \r | |
1397 | @retval * Pointer to the net buffer removed from the specific\r | |
1398 | queue.\r | |
1399 | \r | |
1400 | **/\r | |
1401 | NET_BUF *\r | |
1402 | NetbufQueRemove (\r | |
1403 | IN NET_BUF_QUEUE *NbufQue\r | |
1404 | )\r | |
1405 | {\r | |
1406 | NET_BUF *First;\r | |
1407 | \r | |
1408 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1409 | \r | |
1410 | if (NbufQue->BufNum == 0) {\r | |
1411 | return NULL;\r | |
1412 | }\r | |
1413 | \r | |
1414 | First = NET_LIST_USER_STRUCT (NbufQue->BufList.ForwardLink, NET_BUF, List);\r | |
1415 | \r | |
1416 | NetListRemoveHead (&NbufQue->BufList);\r | |
1417 | \r | |
1418 | NbufQue->BufSize -= First->TotalSize;\r | |
1419 | NbufQue->BufNum--;\r | |
1420 | return First;\r | |
1421 | }\r | |
1422 | \r | |
1423 | \r | |
1424 | /**\r | |
1425 | Copy some data from the buffer queue to the destination.\r | |
1426 | \r | |
1427 | @param NbufQue Pointer to the net buffer queue.\r | |
1428 | @param Offset The sequence number of the first byte to copy.\r | |
1429 | @param Len Length of the data to copy.\r | |
1430 | @param Dest The destination of the data to copy to.\r | |
1431 | \r | |
1432 | @retval UINTN The length of the copied data.\r | |
1433 | \r | |
1434 | **/\r | |
1435 | UINT32\r | |
1436 | NetbufQueCopy (\r | |
1437 | IN NET_BUF_QUEUE *NbufQue,\r | |
1438 | IN UINT32 Offset,\r | |
1439 | IN UINT32 Len,\r | |
1440 | IN UINT8 *Dest\r | |
1441 | )\r | |
1442 | {\r | |
1443 | NET_LIST_ENTRY *Entry;\r | |
1444 | NET_BUF *Nbuf;\r | |
1445 | UINT32 Skip;\r | |
1446 | UINT32 Left;\r | |
1447 | UINT32 Cur;\r | |
1448 | UINT32 Copied;\r | |
1449 | \r | |
1450 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1451 | ASSERT (Dest != NULL);\r | |
1452 | \r | |
1453 | if ((Len == 0) || (NbufQue->BufSize <= Offset)) {\r | |
1454 | return 0;\r | |
1455 | }\r | |
1456 | \r | |
1457 | if (NbufQue->BufSize - Offset < Len) {\r | |
1458 | Len = NbufQue->BufSize - Offset;\r | |
1459 | }\r | |
1460 | \r | |
1461 | //\r | |
1462 | // skip to the Offset\r | |
1463 | //\r | |
1464 | Cur = 0;\r | |
1465 | Nbuf = NULL;\r | |
1466 | \r | |
1467 | NET_LIST_FOR_EACH (Entry, &NbufQue->BufList) {\r | |
1468 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1469 | \r | |
1470 | if (Offset < Cur + Nbuf->TotalSize) {\r | |
1471 | break;\r | |
1472 | }\r | |
1473 | \r | |
1474 | Cur += Nbuf->TotalSize;\r | |
1475 | }\r | |
1476 | \r | |
1477 | //\r | |
1478 | // Copy the data in the first buffer.\r | |
1479 | //\r | |
1480 | Skip = Offset - Cur;\r | |
1481 | Left = Nbuf->TotalSize - Skip;\r | |
1482 | \r | |
1483 | if (Len < Left) {\r | |
1484 | return NetbufCopy (Nbuf, Skip, Len, Dest);\r | |
1485 | }\r | |
1486 | \r | |
1487 | NetbufCopy (Nbuf, Skip, Left, Dest);\r | |
1488 | Dest += Left;\r | |
1489 | Len -= Left;\r | |
1490 | Copied = Left;\r | |
1491 | \r | |
1492 | //\r | |
1493 | // Iterate over the others\r | |
1494 | //\r | |
1495 | Entry = Entry->ForwardLink;\r | |
1496 | \r | |
1497 | while ((Len > 0) && (Entry != &NbufQue->BufList)) {\r | |
1498 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1499 | \r | |
1500 | if (Len > Nbuf->TotalSize) {\r | |
1501 | Len -= Nbuf->TotalSize;\r | |
1502 | Copied += Nbuf->TotalSize;\r | |
1503 | \r | |
1504 | NetbufCopy (Nbuf, 0, Nbuf->TotalSize, Dest);\r | |
1505 | Dest += Nbuf->TotalSize;\r | |
1506 | \r | |
1507 | } else {\r | |
1508 | NetbufCopy (Nbuf, 0, Len, Dest);\r | |
1509 | Copied += Len;\r | |
1510 | break;\r | |
1511 | }\r | |
1512 | \r | |
1513 | Entry = Entry->ForwardLink;\r | |
1514 | }\r | |
1515 | \r | |
1516 | return Copied;\r | |
1517 | }\r | |
1518 | \r | |
1519 | \r | |
1520 | /**\r | |
1521 | Trim some data from the queue header, release the buffer if\r | |
1522 | whole buffer is trimmed.\r | |
1523 | \r | |
1524 | @param NbufQue Pointer to the net buffer queue.\r | |
1525 | @param Len Length of the data to trim.\r | |
1526 | \r | |
1527 | @retval UINTN The length of the data trimmed.\r | |
1528 | \r | |
1529 | **/\r | |
1530 | UINT32\r | |
1531 | NetbufQueTrim (\r | |
1532 | IN NET_BUF_QUEUE *NbufQue,\r | |
1533 | IN UINT32 Len\r | |
1534 | )\r | |
1535 | {\r | |
1536 | NET_LIST_ENTRY *Entry;\r | |
1537 | NET_LIST_ENTRY *Next;\r | |
1538 | NET_BUF *Nbuf;\r | |
1539 | UINT32 Trimmed;\r | |
1540 | \r | |
1541 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1542 | \r | |
1543 | if (Len == 0) {\r | |
1544 | return 0;\r | |
1545 | }\r | |
1546 | \r | |
1547 | if (Len > NbufQue->BufSize) {\r | |
1548 | Len = NbufQue->BufSize;\r | |
1549 | }\r | |
1550 | \r | |
1551 | NbufQue->BufSize -= Len;\r | |
1552 | Trimmed = 0;\r | |
1553 | \r | |
1554 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &NbufQue->BufList) {\r | |
1555 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1556 | \r | |
1557 | if (Len >= Nbuf->TotalSize) {\r | |
1558 | Trimmed += Nbuf->TotalSize;\r | |
1559 | Len -= Nbuf->TotalSize;\r | |
1560 | \r | |
1561 | NetListRemoveEntry (Entry);\r | |
1562 | NetbufFree (Nbuf);\r | |
1563 | \r | |
1564 | NbufQue->BufNum--;\r | |
1565 | \r | |
1566 | if (Len == 0) {\r | |
1567 | break;\r | |
1568 | }\r | |
1569 | \r | |
1570 | } else {\r | |
1571 | Trimmed += NetbufTrim (Nbuf, Len, NET_BUF_HEAD);\r | |
1572 | break;\r | |
1573 | }\r | |
1574 | }\r | |
1575 | \r | |
1576 | return Trimmed;\r | |
1577 | }\r | |
1578 | \r | |
1579 | \r | |
1580 | /**\r | |
1581 | Flush the net buffer queue.\r | |
1582 | \r | |
1583 | @param NbufQue Pointer to the queue to be flushed.\r | |
1584 | \r | |
1585 | @return None.\r | |
1586 | \r | |
1587 | **/\r | |
1588 | VOID\r | |
1589 | NetbufQueFlush (\r | |
1590 | IN NET_BUF_QUEUE *NbufQue\r | |
1591 | )\r | |
1592 | {\r | |
1593 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1594 | \r | |
1595 | NetbufFreeList (&NbufQue->BufList);\r | |
1596 | \r | |
1597 | NbufQue->BufNum = 0;\r | |
1598 | NbufQue->BufSize = 0;\r | |
1599 | }\r | |
1600 | \r | |
1601 | \r | |
1602 | /**\r | |
1603 | Compute checksum for a bulk of data.\r | |
1604 | \r | |
1605 | @param Bulk Pointer to the data.\r | |
1606 | @param Len Length of the data, in bytes.\r | |
1607 | \r | |
1608 | @retval UINT16 The computed checksum.\r | |
1609 | \r | |
1610 | **/\r | |
1611 | UINT16\r | |
1612 | NetblockChecksum (\r | |
1613 | IN UINT8 *Bulk,\r | |
1614 | IN UINT32 Len\r | |
1615 | )\r | |
1616 | {\r | |
1617 | register UINT32 Sum;\r | |
1618 | \r | |
1619 | Sum = 0;\r | |
1620 | \r | |
1621 | while (Len > 1) {\r | |
1622 | Sum += *(UINT16 *) Bulk;\r | |
1623 | Bulk += 2;\r | |
1624 | Len -= 2;\r | |
1625 | }\r | |
1626 | \r | |
1627 | //\r | |
1628 | // Add left-over byte, if any\r | |
1629 | //\r | |
1630 | if (Len > 0) {\r | |
1631 | Sum += *(UINT8 *) Bulk;\r | |
1632 | }\r | |
1633 | \r | |
1634 | //\r | |
1635 | // Fold 32-bit sum to 16 bits\r | |
1636 | //\r | |
1637 | while (Sum >> 16) {\r | |
1638 | Sum = (Sum & 0xffff) + (Sum >> 16);\r | |
1639 | \r | |
1640 | }\r | |
1641 | \r | |
1642 | return (UINT16) Sum;\r | |
1643 | }\r | |
1644 | \r | |
1645 | \r | |
1646 | /**\r | |
1647 | Add two checksums.\r | |
1648 | \r | |
1649 | @param Checksum1 The first checksum to be added.\r | |
1650 | @param Checksum2 The second checksum to be added.\r | |
1651 | \r | |
1652 | @retval UINT16 The new checksum.\r | |
1653 | \r | |
1654 | **/\r | |
1655 | UINT16\r | |
1656 | NetAddChecksum (\r | |
1657 | IN UINT16 Checksum1,\r | |
1658 | IN UINT16 Checksum2\r | |
1659 | )\r | |
1660 | {\r | |
1661 | UINT32 Sum;\r | |
1662 | \r | |
1663 | Sum = Checksum1 + Checksum2;\r | |
1664 | \r | |
1665 | //\r | |
1666 | // two UINT16 can only add up to a carry of 1.\r | |
1667 | //\r | |
1668 | if (Sum >> 16) {\r | |
1669 | Sum = (Sum & 0xffff) + 1;\r | |
1670 | \r | |
1671 | }\r | |
1672 | \r | |
1673 | return (UINT16) Sum;\r | |
1674 | }\r | |
1675 | \r | |
1676 | \r | |
1677 | /**\r | |
1678 | Compute the checksum for a NET_BUF.\r | |
1679 | \r | |
1680 | @param Nbuf Pointer to the net buffer.\r | |
1681 | \r | |
1682 | @retval UINT16 The computed checksum.\r | |
1683 | \r | |
1684 | **/\r | |
1685 | UINT16\r | |
1686 | NetbufChecksum (\r | |
1687 | IN NET_BUF *Nbuf\r | |
1688 | )\r | |
1689 | {\r | |
1690 | NET_BLOCK_OP *BlockOp;\r | |
1691 | UINT32 Offset;\r | |
1692 | UINT16 TotalSum;\r | |
1693 | UINT16 BlockSum;\r | |
1694 | UINT32 Index;\r | |
1695 | \r | |
1696 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1697 | \r | |
1698 | TotalSum = 0;\r | |
1699 | Offset = 0;\r | |
1700 | BlockOp = Nbuf->BlockOp;\r | |
1701 | \r | |
1702 | for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {\r | |
1703 | if (BlockOp[Index].Size == 0) {\r | |
1704 | continue;\r | |
1705 | }\r | |
1706 | \r | |
1707 | BlockSum = NetblockChecksum (BlockOp[Index].Head, BlockOp[Index].Size);\r | |
1708 | \r | |
1709 | if (Offset & 0x01) {\r | |
1710 | //\r | |
1711 | // The checksum starts with an odd byte, swap\r | |
1712 | // the checksum before added to total checksum\r | |
1713 | //\r | |
4eb65aff | 1714 | BlockSum = (UINT16) NET_SWAP_SHORT (BlockSum);\r |
cbf316f2 | 1715 | }\r |
1716 | \r | |
1717 | TotalSum = NetAddChecksum (BlockSum, TotalSum);\r | |
1718 | Offset += BlockOp[Index].Size;\r | |
1719 | }\r | |
1720 | \r | |
1721 | return TotalSum;\r | |
1722 | }\r | |
1723 | \r | |
1724 | \r | |
1725 | /**\r | |
1726 | Compute the checksum for TCP/UDP pseudo header.\r | |
1727 | Src, Dst are in network byte order. and Len is\r | |
1728 | in host byte order.\r | |
1729 | \r | |
1730 | @param Src The source address of the packet.\r | |
1731 | @param Dst The destination address of the packet.\r | |
1732 | @param Proto The protocol type of the packet.\r | |
1733 | @param Len The length of the packet.\r | |
1734 | \r | |
1735 | @retval UINT16 The computed checksum.\r | |
1736 | \r | |
1737 | **/\r | |
1738 | UINT16\r | |
1739 | NetPseudoHeadChecksum (\r | |
1740 | IN IP4_ADDR Src,\r | |
1741 | IN IP4_ADDR Dst,\r | |
1742 | IN UINT8 Proto,\r | |
1743 | IN UINT16 Len\r | |
1744 | )\r | |
1745 | {\r | |
1746 | NET_PSEUDO_HDR Hdr;\r | |
1747 | \r | |
1748 | //\r | |
1749 | // Zero the memory to relieve align problems\r | |
1750 | //\r | |
1751 | NetZeroMem (&Hdr, sizeof (Hdr));\r | |
1752 | \r | |
1753 | Hdr.SrcIp = Src;\r | |
1754 | Hdr.DstIp = Dst;\r | |
1755 | Hdr.Protocol = Proto;\r | |
1756 | Hdr.Len = HTONS (Len);\r | |
1757 | \r | |
1758 | return NetblockChecksum ((UINT8 *) &Hdr, sizeof (Hdr));\r | |
1759 | }\r |