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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 | |
f5acf5c6 | 22 | #include <PiDxe.h>\r |
23 | \r | |
24 | #include <Library/NetLib.h>\r | |
25 | #include <Library/BaseLib.h>\r | |
26 | #include <Library/DebugLib.h>\r | |
27 | #include <Library/BaseMemoryLib.h>\r | |
28 | #include <Library/UefiBootServicesTableLib.h>\r | |
cbf316f2 | 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 | |
cbf316f2 | 44 | NET_BUF *\r |
45 | NetbufAllocStruct (\r | |
46 | IN UINT32 BlockNum,\r | |
47 | IN UINT32 BlockOpNum\r | |
48 | )\r | |
49 | {\r | |
50 | NET_BUF *Nbuf;\r | |
51 | NET_VECTOR *Vector;\r | |
52 | \r | |
53 | ASSERT (BlockOpNum >= 1);\r | |
54 | \r | |
55 | //\r | |
56 | // Allocate three memory blocks.\r | |
57 | //\r | |
e48e37fc | 58 | Nbuf = AllocateZeroPool (NET_BUF_SIZE (BlockOpNum));\r |
cbf316f2 | 59 | \r |
60 | if (Nbuf == NULL) {\r | |
61 | return NULL;\r | |
62 | }\r | |
63 | \r | |
64 | Nbuf->Signature = NET_BUF_SIGNATURE;\r | |
65 | Nbuf->RefCnt = 1;\r | |
66 | Nbuf->BlockOpNum = BlockOpNum;\r | |
e48e37fc | 67 | InitializeListHead (&Nbuf->List);\r |
cbf316f2 | 68 | \r |
69 | if (BlockNum != 0) {\r | |
e48e37fc | 70 | Vector = AllocateZeroPool (NET_VECTOR_SIZE (BlockNum));\r |
cbf316f2 | 71 | \r |
72 | if (Vector == NULL) {\r | |
73 | goto FreeNbuf;\r | |
74 | }\r | |
75 | \r | |
76 | Vector->Signature = NET_VECTOR_SIGNATURE;\r | |
77 | Vector->RefCnt = 1;\r | |
78 | Vector->BlockNum = BlockNum;\r | |
79 | Nbuf->Vector = Vector;\r | |
80 | }\r | |
81 | \r | |
82 | return Nbuf;\r | |
83 | \r | |
84 | FreeNbuf:\r | |
85 | \r | |
e48e37fc | 86 | gBS->FreePool (Nbuf);\r |
cbf316f2 | 87 | return NULL;\r |
88 | }\r | |
89 | \r | |
90 | \r | |
91 | /**\r | |
92 | Allocate a single block NET_BUF. Upon allocation, all the\r | |
93 | free space is in the tail room.\r | |
94 | \r | |
95 | @param Len The length of the block.\r | |
96 | \r | |
97 | @retval * Pointer to the allocated NET_BUF. If NULL the\r | |
98 | allocation failed due to resource limit.\r | |
99 | \r | |
100 | **/\r | |
101 | NET_BUF *\r | |
7b414b4e | 102 | EFIAPI\r |
cbf316f2 | 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 | |
e48e37fc | 119 | Bulk = AllocatePool (Len);\r |
cbf316f2 | 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 | |
e48e37fc | 141 | gBS->FreePool (Nbuf);\r |
cbf316f2 | 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 | |
cbf316f2 | 154 | VOID\r |
155 | NetbufFreeVector (\r | |
156 | IN NET_VECTOR *Vector\r | |
157 | )\r | |
158 | {\r | |
159 | UINT32 Index;\r | |
160 | \r | |
161 | NET_CHECK_SIGNATURE (Vector, NET_VECTOR_SIGNATURE);\r | |
162 | ASSERT (Vector->RefCnt > 0);\r | |
163 | \r | |
164 | Vector->RefCnt--;\r | |
165 | \r | |
166 | if (Vector->RefCnt > 0) {\r | |
167 | return;\r | |
168 | }\r | |
169 | \r | |
170 | if (Vector->Free != NULL) {\r | |
171 | //\r | |
172 | // Call external free function to free the vector if it\r | |
173 | // isn't NULL. If NET_VECTOR_OWN_FIRST is set, release the\r | |
174 | // first block since it is allocated by us\r | |
175 | //\r | |
176 | if (Vector->Flag & NET_VECTOR_OWN_FIRST) {\r | |
e48e37fc | 177 | gBS->FreePool (Vector->Block[0].Bulk);\r |
cbf316f2 | 178 | }\r |
179 | \r | |
180 | Vector->Free (Vector->Arg);\r | |
181 | \r | |
182 | } else {\r | |
183 | //\r | |
184 | // Free each memory block associated with the Vector\r | |
185 | //\r | |
186 | for (Index = 0; Index < Vector->BlockNum; Index++) {\r | |
e48e37fc | 187 | gBS->FreePool (Vector->Block[Index].Bulk);\r |
cbf316f2 | 188 | }\r |
189 | }\r | |
190 | \r | |
e48e37fc | 191 | gBS->FreePool (Vector);\r |
cbf316f2 | 192 | }\r |
193 | \r | |
194 | \r | |
195 | /**\r | |
196 | Free the buffer and its associated NET_VECTOR.\r | |
197 | \r | |
198 | @param Nbuf Pointer to the NET_BUF to be freed.\r | |
199 | \r | |
200 | @return None.\r | |
201 | \r | |
202 | **/\r | |
203 | VOID\r | |
7b414b4e | 204 | EFIAPI\r |
cbf316f2 | 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 | |
e48e37fc | 220 | gBS->FreePool (Nbuf);\r |
cbf316f2 | 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 | |
7b414b4e | 234 | EFIAPI\r |
cbf316f2 | 235 | NetbufClone (\r |
236 | IN NET_BUF *Nbuf\r | |
237 | )\r | |
238 | {\r | |
239 | NET_BUF *Clone;\r | |
240 | \r | |
241 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
242 | \r | |
e48e37fc | 243 | Clone = AllocatePool (NET_BUF_SIZE (Nbuf->BlockOpNum));\r |
cbf316f2 | 244 | \r |
245 | if (Clone == NULL) {\r | |
246 | return NULL;\r | |
247 | }\r | |
248 | \r | |
249 | Clone->Signature = NET_BUF_SIGNATURE;\r | |
250 | Clone->RefCnt = 1;\r | |
e48e37fc | 251 | InitializeListHead (&Clone->List);\r |
cbf316f2 | 252 | \r |
253 | Clone->Ip = Nbuf->Ip;\r | |
254 | Clone->Tcp = Nbuf->Tcp;\r | |
255 | \r | |
e48e37fc | 256 | CopyMem (Clone->ProtoData, Nbuf->ProtoData, NET_PROTO_DATA);\r |
cbf316f2 | 257 | \r |
258 | NET_GET_REF (Nbuf->Vector);\r | |
259 | \r | |
260 | Clone->Vector = Nbuf->Vector;\r | |
261 | Clone->BlockOpNum = Nbuf->BlockOpNum;\r | |
262 | Clone->TotalSize = Nbuf->TotalSize;\r | |
e48e37fc | 263 | CopyMem (Clone->BlockOp, Nbuf->BlockOp, sizeof (NET_BLOCK_OP) * Nbuf->BlockOpNum);\r |
cbf316f2 | 264 | \r |
265 | return Clone;\r | |
266 | }\r | |
267 | \r | |
268 | \r | |
269 | /**\r | |
270 | Create a duplicated copy of Nbuf, data is copied. Also leave some\r | |
271 | head space before the data.\r | |
272 | \r | |
273 | @param Nbuf Pointer to the net buffer to be cloned.\r | |
274 | @param Duplicate Pointer to the net buffer to duplicate to, if NULL\r | |
275 | a new net buffer is allocated.\r | |
276 | @param HeadSpace Length of the head space to reserve\r | |
277 | \r | |
278 | @retval * Pointer to the duplicated net buffer.\r | |
279 | \r | |
280 | **/\r | |
281 | NET_BUF *\r | |
7b414b4e | 282 | EFIAPI\r |
cbf316f2 | 283 | NetbufDuplicate (\r |
284 | IN NET_BUF *Nbuf,\r | |
285 | IN NET_BUF *Duplicate OPTIONAL,\r | |
286 | IN UINT32 HeadSpace\r | |
287 | )\r | |
288 | {\r | |
289 | UINT8 *Dst;\r | |
290 | \r | |
291 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
292 | \r | |
293 | if (Duplicate == NULL) {\r | |
294 | Duplicate = NetbufAlloc (Nbuf->TotalSize + HeadSpace);\r | |
295 | }\r | |
296 | \r | |
297 | if (Duplicate == NULL) {\r | |
298 | return NULL;\r | |
299 | }\r | |
300 | \r | |
301 | //\r | |
302 | // Don't set the IP and TCP head point, since it is most\r | |
303 | // like that they are pointing to the memory of Nbuf.\r | |
304 | //\r | |
e48e37fc | 305 | CopyMem (Duplicate->ProtoData, Nbuf->ProtoData, NET_PROTO_DATA);\r |
cbf316f2 | 306 | NetbufReserve (Duplicate, HeadSpace);\r |
307 | \r | |
308 | Dst = NetbufAllocSpace (Duplicate, Nbuf->TotalSize, NET_BUF_TAIL);\r | |
309 | NetbufCopy (Nbuf, 0, Nbuf->TotalSize, Dst);\r | |
310 | \r | |
311 | return Duplicate;\r | |
312 | }\r | |
313 | \r | |
314 | \r | |
315 | /**\r | |
316 | Free a list of net buffers.\r | |
317 | \r | |
318 | @param Head Pointer to the head of linked net buffers.\r | |
319 | \r | |
320 | @return None.\r | |
321 | \r | |
322 | **/\r | |
323 | VOID\r | |
7b414b4e | 324 | EFIAPI\r |
cbf316f2 | 325 | NetbufFreeList (\r |
e48e37fc | 326 | IN LIST_ENTRY *Head\r |
cbf316f2 | 327 | )\r |
328 | {\r | |
e48e37fc | 329 | LIST_ENTRY *Entry;\r |
330 | LIST_ENTRY *Next;\r | |
cbf316f2 | 331 | NET_BUF *Nbuf;\r |
332 | \r | |
333 | Entry = Head->ForwardLink;\r | |
334 | \r | |
335 | NET_LIST_FOR_EACH_SAFE (Entry, Next, Head) {\r | |
336 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
337 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
338 | \r | |
e48e37fc | 339 | RemoveEntryList (Entry);\r |
cbf316f2 | 340 | NetbufFree (Nbuf);\r |
341 | }\r | |
342 | \r | |
e48e37fc | 343 | ASSERT (IsListEmpty (Head));\r |
cbf316f2 | 344 | }\r |
345 | \r | |
346 | \r | |
347 | /**\r | |
348 | Get the position of some byte in the net buffer. This can be used\r | |
349 | to, for example, retrieve the IP header in the packet. It also\r | |
350 | returns the fragment that contains the byte which is used mainly by\r | |
351 | the buffer implementation itself.\r | |
352 | \r | |
353 | @param Nbuf Pointer to the net buffer.\r | |
354 | @param Offset The index or offset of the byte\r | |
355 | @param Index Index of the fragment that contains the block\r | |
356 | \r | |
357 | @retval * Pointer to the nth byte of data in the net buffer.\r | |
358 | If NULL, there is no such data in the net buffer.\r | |
359 | \r | |
360 | **/\r | |
361 | UINT8 *\r | |
7b414b4e | 362 | EFIAPI\r |
cbf316f2 | 363 | NetbufGetByte (\r |
364 | IN NET_BUF *Nbuf,\r | |
365 | IN UINT32 Offset,\r | |
366 | OUT UINT32 *Index OPTIONAL\r | |
367 | )\r | |
368 | {\r | |
369 | NET_BLOCK_OP *BlockOp;\r | |
370 | UINT32 Loop;\r | |
371 | UINT32 Len;\r | |
372 | \r | |
373 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
374 | \r | |
375 | if (Offset >= Nbuf->TotalSize) {\r | |
376 | return NULL;\r | |
377 | }\r | |
378 | \r | |
379 | BlockOp = Nbuf->BlockOp;\r | |
380 | Len = 0;\r | |
381 | \r | |
382 | for (Loop = 0; Loop < Nbuf->BlockOpNum; Loop++) {\r | |
383 | \r | |
384 | if (Len + BlockOp[Loop].Size <= Offset) {\r | |
385 | Len += BlockOp[Loop].Size;\r | |
386 | continue;\r | |
387 | }\r | |
388 | \r | |
389 | if (Index != NULL) {\r | |
390 | *Index = Loop;\r | |
391 | }\r | |
392 | \r | |
393 | return BlockOp[Loop].Head + (Offset - Len);\r | |
394 | }\r | |
395 | \r | |
396 | return NULL;\r | |
397 | }\r | |
398 | \r | |
399 | \r | |
400 | \r | |
401 | /**\r | |
402 | Set the NET_BLOCK and corresponding NET_BLOCK_OP in\r | |
403 | the buffer. All the pointers in NET_BLOCK and NET_BLOCK_OP\r | |
404 | are set to the bulk's head and tail respectively. So, this\r | |
405 | function alone can't be used by NetbufAlloc.\r | |
406 | \r | |
407 | @param Nbuf Pointer to the net buffer.\r | |
408 | @param Bulk Pointer to the data.\r | |
409 | @param Len Length of the bulk data.\r | |
410 | @param Index The data block index in the net buffer the bulk\r | |
411 | data should belong to.\r | |
412 | \r | |
413 | @return None.\r | |
414 | \r | |
415 | **/\r | |
cbf316f2 | 416 | VOID\r |
417 | NetbufSetBlock (\r | |
418 | IN NET_BUF *Nbuf,\r | |
419 | IN UINT8 *Bulk,\r | |
420 | IN UINT32 Len,\r | |
421 | IN UINT32 Index\r | |
422 | )\r | |
423 | {\r | |
424 | NET_BLOCK_OP *BlockOp;\r | |
425 | NET_BLOCK *Block;\r | |
426 | \r | |
427 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
428 | NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);\r | |
429 | ASSERT (Index < Nbuf->BlockOpNum);\r | |
430 | \r | |
431 | Block = &(Nbuf->Vector->Block[Index]);\r | |
432 | BlockOp = &(Nbuf->BlockOp[Index]);\r | |
433 | Block->Len = Len;\r | |
434 | Block->Bulk = Bulk;\r | |
435 | BlockOp->BlockHead = Bulk;\r | |
436 | BlockOp->BlockTail = Bulk + Len;\r | |
437 | BlockOp->Head = Bulk;\r | |
438 | BlockOp->Tail = Bulk + Len;\r | |
439 | BlockOp->Size = Len;\r | |
440 | }\r | |
441 | \r | |
442 | \r | |
443 | \r | |
444 | /**\r | |
445 | Set the NET_BLOCK_OP in the buffer. The corresponding NET_BLOCK\r | |
446 | structure is left untouched. Some times, there is no 1:1 relationship\r | |
447 | between NET_BLOCK and NET_BLOCK_OP. For example, that in NetbufGetFragment.\r | |
448 | \r | |
449 | @param Nbuf Pointer to the net buffer.\r | |
450 | @param Bulk Pointer to the data.\r | |
451 | @param Len Length of the bulk data.\r | |
452 | @param Index The data block index in the net buffer the bulk\r | |
453 | data should belong to.\r | |
454 | \r | |
455 | @return None.\r | |
456 | \r | |
457 | **/\r | |
cbf316f2 | 458 | VOID\r |
459 | NetbufSetBlockOp (\r | |
460 | IN NET_BUF *Nbuf,\r | |
461 | IN UINT8 *Bulk,\r | |
462 | IN UINT32 Len,\r | |
463 | IN UINT32 Index\r | |
464 | )\r | |
465 | {\r | |
466 | NET_BLOCK_OP *BlockOp;\r | |
467 | \r | |
468 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
469 | ASSERT (Index < Nbuf->BlockOpNum);\r | |
470 | \r | |
471 | BlockOp = &(Nbuf->BlockOp[Index]);\r | |
472 | BlockOp->BlockHead = Bulk;\r | |
473 | BlockOp->BlockTail = Bulk + Len;\r | |
474 | BlockOp->Head = Bulk;\r | |
475 | BlockOp->Tail = Bulk + Len;\r | |
476 | BlockOp->Size = Len;\r | |
477 | }\r | |
478 | \r | |
479 | \r | |
480 | /**\r | |
481 | Helper function for NetbufClone. It is necessary because NetbufGetFragment\r | |
482 | may allocate the first block to accomodate the HeadSpace and HeadLen. So, it\r | |
483 | need to create a new NET_VECTOR. But, we want to avoid data copy by sharing\r | |
484 | the old NET_VECTOR.\r | |
485 | \r | |
486 | @param Arg Point to the old NET_VECTOR\r | |
487 | \r | |
488 | @return NONE\r | |
489 | \r | |
490 | **/\r | |
cbf316f2 | 491 | VOID\r |
492 | NetbufGetFragmentFree (\r | |
493 | IN VOID *Arg\r | |
494 | )\r | |
495 | {\r | |
496 | NET_VECTOR *Vector;\r | |
497 | \r | |
498 | Vector = (NET_VECTOR *)Arg;\r | |
499 | NetbufFreeVector (Vector);\r | |
500 | }\r | |
501 | \r | |
502 | \r | |
503 | \r | |
504 | /**\r | |
505 | Create a NET_BUF structure which contains Len byte data of\r | |
506 | Nbuf starting from Offset. A new NET_BUF structure will be\r | |
507 | created but the associated data in NET_VECTOR is shared.\r | |
508 | This function exists to do IP packet fragmentation.\r | |
509 | \r | |
510 | @param Nbuf Pointer to the net buffer to be cloned.\r | |
511 | @param Offset Starting point of the data to be included in new\r | |
512 | buffer.\r | |
513 | @param Len How many data to include in new data\r | |
514 | @param HeadSpace How many bytes of head space to reserve for\r | |
515 | protocol header\r | |
516 | \r | |
517 | @retval * Pointer to the cloned net buffer.\r | |
518 | \r | |
519 | **/\r | |
520 | NET_BUF *\r | |
7b414b4e | 521 | EFIAPI\r |
cbf316f2 | 522 | NetbufGetFragment (\r |
523 | IN NET_BUF *Nbuf,\r | |
524 | IN UINT32 Offset,\r | |
525 | IN UINT32 Len,\r | |
526 | IN UINT32 HeadSpace\r | |
527 | )\r | |
528 | {\r | |
529 | NET_BUF *Child;\r | |
530 | NET_VECTOR *Vector;\r | |
531 | NET_BLOCK_OP *BlockOp;\r | |
532 | UINT32 CurBlockOp;\r | |
533 | UINT32 BlockOpNum;\r | |
534 | UINT8 *FirstBulk;\r | |
535 | UINT32 Index;\r | |
536 | UINT32 First;\r | |
537 | UINT32 Last;\r | |
538 | UINT32 FirstSkip;\r | |
539 | UINT32 FirstLen;\r | |
540 | UINT32 LastLen;\r | |
541 | UINT32 Cur;\r | |
542 | \r | |
543 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
544 | \r | |
545 | if ((Len == 0) || (Offset + Len > Nbuf->TotalSize)) {\r | |
546 | return NULL;\r | |
547 | }\r | |
548 | \r | |
549 | //\r | |
550 | // First find the first and last BlockOp that contains\r | |
551 | // the valid data, and compute the offset of the first\r | |
552 | // BlockOp and length of the last BlockOp\r | |
553 | //\r | |
554 | BlockOp = Nbuf->BlockOp;\r | |
555 | Cur = 0;\r | |
556 | \r | |
557 | for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {\r | |
558 | if (Offset < Cur + BlockOp[Index].Size) {\r | |
559 | break;\r | |
560 | }\r | |
561 | \r | |
562 | Cur += BlockOp[Index].Size;\r | |
563 | }\r | |
564 | \r | |
565 | //\r | |
566 | // First is the index of the first BlockOp, FirstSkip is\r | |
567 | // the offset of the first byte in the first BlockOp.\r | |
568 | //\r | |
569 | First = Index;\r | |
570 | FirstSkip = Offset - Cur;\r | |
571 | FirstLen = BlockOp[Index].Size - FirstSkip;\r | |
572 | \r | |
573 | //\r | |
574 | //redundant assignment to make compiler happy.\r | |
575 | //\r | |
576 | Last = 0;\r | |
577 | LastLen = 0;\r | |
578 | \r | |
579 | if (Len > FirstLen) {\r | |
580 | Cur += BlockOp[Index].Size;\r | |
581 | Index++;\r | |
582 | \r | |
583 | for (; Index < Nbuf->BlockOpNum; Index++) {\r | |
584 | if (Offset + Len <= Cur + BlockOp[Index].Size) {\r | |
585 | Last = Index;\r | |
586 | LastLen = Offset + Len - Cur;\r | |
587 | break;\r | |
588 | }\r | |
589 | \r | |
590 | Cur += BlockOp[Index].Size;\r | |
591 | }\r | |
592 | \r | |
593 | } else {\r | |
594 | Last = First;\r | |
595 | LastLen = Len;\r | |
596 | FirstLen = Len;\r | |
597 | }\r | |
598 | \r | |
599 | BlockOpNum = Last - First + 1;\r | |
600 | CurBlockOp = 0;\r | |
601 | \r | |
602 | if (HeadSpace != 0) {\r | |
603 | //\r | |
604 | // Allocate an extra block to accomdate the head space.\r | |
605 | //\r | |
606 | BlockOpNum++;\r | |
607 | \r | |
608 | Child = NetbufAllocStruct (1, BlockOpNum);\r | |
609 | \r | |
610 | if (Child == NULL) {\r | |
611 | return NULL;\r | |
612 | }\r | |
613 | \r | |
e48e37fc | 614 | FirstBulk = AllocatePool (HeadSpace);\r |
cbf316f2 | 615 | \r |
616 | if (FirstBulk == NULL) {\r | |
617 | goto FreeChild;\r | |
618 | }\r | |
619 | \r | |
620 | Vector = Child->Vector;\r | |
621 | Vector->Free = NetbufGetFragmentFree;\r | |
622 | Vector->Arg = Nbuf->Vector;\r | |
623 | Vector->Flag = NET_VECTOR_OWN_FIRST;\r | |
624 | Vector->Len = HeadSpace;\r | |
625 | \r | |
626 | //\r | |
627 | //Reserve the head space in the first block\r | |
628 | //\r | |
629 | NetbufSetBlock (Child, FirstBulk, HeadSpace, 0);\r | |
630 | Child->BlockOp[0].Head += HeadSpace;\r | |
631 | Child->BlockOp[0].Size = 0;\r | |
632 | CurBlockOp++;\r | |
633 | \r | |
634 | }else {\r | |
635 | Child = NetbufAllocStruct (0, BlockOpNum);\r | |
636 | \r | |
637 | if (Child == NULL) {\r | |
638 | return NULL;\r | |
639 | }\r | |
640 | \r | |
641 | Child->Vector = Nbuf->Vector;\r | |
642 | }\r | |
643 | \r | |
644 | NET_GET_REF (Nbuf->Vector);\r | |
645 | Child->TotalSize = Len;\r | |
646 | \r | |
647 | //\r | |
648 | // Set all the BlockOp up, the first and last one are special\r | |
649 | // and need special process.\r | |
650 | //\r | |
651 | NetbufSetBlockOp (\r | |
652 | Child,\r | |
653 | Nbuf->BlockOp[First].Head + FirstSkip,\r | |
654 | FirstLen,\r | |
655 | CurBlockOp++\r | |
656 | );\r | |
657 | \r | |
8d285ec0 | 658 | for (Index = First + 1; Index <= Last - 1 ; Index++) {\r |
cbf316f2 | 659 | NetbufSetBlockOp (\r |
660 | Child,\r | |
661 | BlockOp[Index].Head,\r | |
662 | BlockOp[Index].Size,\r | |
663 | CurBlockOp++\r | |
664 | );\r | |
665 | }\r | |
666 | \r | |
667 | if (First != Last) {\r | |
668 | NetbufSetBlockOp (\r | |
669 | Child,\r | |
670 | BlockOp[Last].Head,\r | |
671 | LastLen,\r | |
672 | CurBlockOp\r | |
673 | );\r | |
674 | }\r | |
675 | \r | |
e48e37fc | 676 | CopyMem (Child->ProtoData, Nbuf->ProtoData, NET_PROTO_DATA);\r |
cbf316f2 | 677 | return Child;\r |
678 | \r | |
679 | FreeChild:\r | |
680 | \r | |
e48e37fc | 681 | gBS->FreePool (Child);\r |
cbf316f2 | 682 | return NULL;\r |
683 | }\r | |
684 | \r | |
685 | \r | |
686 | \r | |
687 | /**\r | |
688 | Build a NET_BUF from external blocks.\r | |
689 | \r | |
690 | @param ExtFragment Pointer to the data block.\r | |
691 | @param ExtNum The number of the data block.\r | |
692 | @param HeadSpace The head space to be reserved.\r | |
693 | @param HeadLen The length of the protocol header, This function\r | |
694 | will pull that number of data into a linear block.\r | |
695 | @param ExtFree Pointer to the caller provided free function.\r | |
696 | @param Arg The argument passed to ExtFree when ExtFree is\r | |
697 | called.\r | |
698 | \r | |
699 | @retval * Pointer to the net buffer built from the data\r | |
700 | blocks.\r | |
701 | \r | |
702 | **/\r | |
703 | NET_BUF *\r | |
7b414b4e | 704 | EFIAPI\r |
cbf316f2 | 705 | NetbufFromExt (\r |
706 | IN NET_FRAGMENT *ExtFragment,\r | |
707 | IN UINT32 ExtNum,\r | |
708 | IN UINT32 HeadSpace,\r | |
709 | IN UINT32 HeadLen,\r | |
710 | IN NET_VECTOR_EXT_FREE ExtFree,\r | |
711 | IN VOID *Arg OPTIONAL\r | |
712 | )\r | |
713 | {\r | |
714 | NET_BUF *Nbuf;\r | |
715 | NET_VECTOR *Vector;\r | |
716 | NET_FRAGMENT SavedFragment;\r | |
717 | UINT32 SavedIndex;\r | |
718 | UINT32 TotalLen;\r | |
719 | UINT32 BlockNum;\r | |
720 | UINT8 *FirstBlock;\r | |
721 | UINT32 FirstBlockLen;\r | |
722 | UINT8 *Header;\r | |
723 | UINT32 CurBlock;\r | |
724 | UINT32 Index;\r | |
725 | UINT32 Len;\r | |
726 | UINT32 Copied;\r | |
727 | \r | |
728 | ASSERT ((ExtFragment != NULL) && (ExtNum > 0) && (ExtFree != NULL));\r | |
729 | \r | |
730 | SavedFragment.Bulk = NULL;\r | |
731 | SavedFragment.Len = 0;\r | |
732 | \r | |
733 | FirstBlockLen = 0;\r | |
734 | FirstBlock = NULL;\r | |
735 | BlockNum = ExtNum;\r | |
736 | Index = 0;\r | |
737 | TotalLen = 0;\r | |
738 | SavedIndex = 0;\r | |
739 | Len = 0;\r | |
740 | Copied = 0;\r | |
741 | \r | |
742 | //\r | |
743 | // No need to consolidate the header if the first block is\r | |
744 | // longer than the header length or there is only one block.\r | |
745 | //\r | |
746 | if ((ExtFragment[0].Len >= HeadLen) || (ExtNum == 1)) {\r | |
747 | HeadLen = 0;\r | |
748 | }\r | |
749 | \r | |
750 | //\r | |
751 | // Allocate an extra block if we need to:\r | |
752 | // 1. Allocate some header space\r | |
753 | // 2. aggreate the packet header\r | |
754 | //\r | |
755 | if ((HeadSpace != 0) || (HeadLen != 0)) {\r | |
756 | FirstBlockLen = HeadLen + HeadSpace;\r | |
e48e37fc | 757 | FirstBlock = AllocatePool (FirstBlockLen);\r |
cbf316f2 | 758 | \r |
759 | if (FirstBlock == NULL) {\r | |
760 | return NULL;\r | |
761 | }\r | |
762 | \r | |
763 | BlockNum++;\r | |
764 | }\r | |
765 | \r | |
766 | //\r | |
767 | // Copy the header to the first block, reduce the NET_BLOCK\r | |
768 | // to allocate by one for each block that is completely covered\r | |
769 | // by the first bulk.\r | |
770 | //\r | |
771 | if (HeadLen != 0) {\r | |
772 | Len = HeadLen;\r | |
773 | Header = FirstBlock + HeadSpace;\r | |
774 | \r | |
775 | for (Index = 0; Index < ExtNum; Index++) {\r | |
776 | if (Len >= ExtFragment[Index].Len) {\r | |
e48e37fc | 777 | CopyMem (Header, ExtFragment[Index].Bulk, ExtFragment[Index].Len);\r |
cbf316f2 | 778 | \r |
779 | Copied += ExtFragment[Index].Len;\r | |
780 | Len -= ExtFragment[Index].Len;\r | |
781 | Header += ExtFragment[Index].Len;\r | |
782 | TotalLen += ExtFragment[Index].Len;\r | |
783 | BlockNum--;\r | |
784 | \r | |
785 | if (Len == 0) {\r | |
786 | //\r | |
787 | // Increament the index number to point to the next\r | |
788 | // non-empty fragment.\r | |
789 | //\r | |
790 | Index++;\r | |
791 | break;\r | |
792 | }\r | |
793 | \r | |
794 | } else {\r | |
e48e37fc | 795 | CopyMem (Header, ExtFragment[Index].Bulk, Len);\r |
cbf316f2 | 796 | \r |
797 | Copied += Len;\r | |
798 | TotalLen += Len;\r | |
799 | \r | |
800 | //\r | |
801 | // Adjust the block structure to exclude the data copied,\r | |
802 | // So, the left-over block can be processed as other blocks.\r | |
803 | // But it must be recovered later. (SavedIndex > 0) always\r | |
804 | // holds since we don't aggreate the header if the first block\r | |
805 | // is bigger enough that the header is continuous\r | |
806 | //\r | |
807 | SavedIndex = Index;\r | |
808 | SavedFragment = ExtFragment[Index];\r | |
809 | ExtFragment[Index].Bulk += Len;\r | |
810 | ExtFragment[Index].Len -= Len;\r | |
811 | break;\r | |
812 | }\r | |
813 | }\r | |
814 | }\r | |
815 | \r | |
816 | Nbuf = NetbufAllocStruct (BlockNum, BlockNum);\r | |
817 | \r | |
818 | if (Nbuf == NULL) {\r | |
819 | goto FreeFirstBlock;\r | |
820 | }\r | |
821 | \r | |
822 | Vector = Nbuf->Vector;\r | |
823 | Vector->Free = ExtFree;\r | |
824 | Vector->Arg = Arg;\r | |
825 | Vector->Flag = (FirstBlockLen ? NET_VECTOR_OWN_FIRST : 0);\r | |
826 | \r | |
827 | //\r | |
828 | // Set the first block up which may contain\r | |
829 | // some head space and aggregated header\r | |
830 | //\r | |
831 | CurBlock = 0;\r | |
832 | \r | |
833 | if (FirstBlockLen != 0) {\r | |
834 | NetbufSetBlock (Nbuf, FirstBlock, HeadSpace + Copied, 0);\r | |
835 | Nbuf->BlockOp[0].Head += HeadSpace;\r | |
836 | Nbuf->BlockOp[0].Size = Copied;\r | |
837 | \r | |
838 | CurBlock++;\r | |
839 | }\r | |
840 | \r | |
841 | for (; Index < ExtNum; Index++) {\r | |
842 | NetbufSetBlock (Nbuf, ExtFragment[Index].Bulk, ExtFragment[Index].Len, CurBlock);\r | |
843 | TotalLen += ExtFragment[Index].Len;\r | |
844 | CurBlock++;\r | |
845 | }\r | |
846 | \r | |
847 | Vector->Len = TotalLen + HeadSpace;\r | |
848 | Nbuf->TotalSize = TotalLen;\r | |
849 | \r | |
850 | if (SavedIndex) {\r | |
851 | ExtFragment[SavedIndex] = SavedFragment;\r | |
852 | }\r | |
853 | \r | |
854 | return Nbuf;\r | |
855 | \r | |
856 | FreeFirstBlock:\r | |
e48e37fc | 857 | gBS->FreePool (FirstBlock);\r |
cbf316f2 | 858 | return NULL;\r |
859 | }\r | |
860 | \r | |
861 | \r | |
862 | /**\r | |
863 | Build a fragment table to contain the fragments in the\r | |
864 | buffer. This is the opposite of the NetbufFromExt.\r | |
865 | \r | |
866 | @param Nbuf Point to the net buffer\r | |
867 | @param ExtFragment Pointer to the data block.\r | |
868 | @param ExtNum The number of the data block.\r | |
869 | \r | |
870 | @retval EFI_BUFFER_TOO_SMALL The number of non-empty block is bigger than ExtNum\r | |
871 | @retval EFI_SUCCESS Fragment table built.\r | |
872 | \r | |
873 | **/\r | |
874 | EFI_STATUS\r | |
7b414b4e | 875 | EFIAPI\r |
cbf316f2 | 876 | NetbufBuildExt (\r |
877 | IN NET_BUF *Nbuf,\r | |
878 | IN NET_FRAGMENT *ExtFragment,\r | |
879 | IN UINT32 *ExtNum\r | |
880 | )\r | |
881 | {\r | |
882 | UINT32 Index;\r | |
883 | UINT32 Current;\r | |
884 | \r | |
885 | Current = 0;\r | |
886 | \r | |
887 | for (Index = 0; (Index < Nbuf->BlockOpNum); Index++) {\r | |
888 | if (Nbuf->BlockOp[Index].Size == 0) {\r | |
889 | continue;\r | |
890 | }\r | |
891 | \r | |
892 | if (Current < *ExtNum) {\r | |
893 | ExtFragment[Current].Bulk = Nbuf->BlockOp[Index].Head;\r | |
894 | ExtFragment[Current].Len = Nbuf->BlockOp[Index].Size;\r | |
895 | Current++;\r | |
896 | } else {\r | |
897 | return EFI_BUFFER_TOO_SMALL;\r | |
898 | }\r | |
899 | }\r | |
900 | \r | |
901 | *ExtNum = Current;\r | |
902 | return EFI_SUCCESS;\r | |
903 | }\r | |
904 | \r | |
905 | \r | |
906 | /**\r | |
907 | Build a NET_BUF from a list of NET_BUF.\r | |
908 | \r | |
909 | @param BufList A List of NET_BUF.\r | |
910 | @param HeadSpace The head space to be reserved.\r | |
911 | @param HeaderLen The length of the protocol header, This function\r | |
912 | will pull that number of data into a linear block.\r | |
913 | @param ExtFree Pointer to the caller provided free function.\r | |
914 | @param Arg The argument passed to ExtFree when ExtFree is\r | |
915 | called.\r | |
916 | \r | |
917 | @retval * Pointer to the net buffer built from the data\r | |
918 | blocks.\r | |
919 | \r | |
920 | **/\r | |
921 | NET_BUF *\r | |
7b414b4e | 922 | EFIAPI\r |
cbf316f2 | 923 | NetbufFromBufList (\r |
e48e37fc | 924 | IN LIST_ENTRY *BufList,\r |
cbf316f2 | 925 | IN UINT32 HeadSpace,\r |
926 | IN UINT32 HeaderLen,\r | |
927 | IN NET_VECTOR_EXT_FREE ExtFree,\r | |
928 | IN VOID *Arg OPTIONAL\r | |
929 | )\r | |
930 | {\r | |
931 | NET_FRAGMENT *Fragment;\r | |
932 | UINT32 FragmentNum;\r | |
e48e37fc | 933 | LIST_ENTRY *Entry;\r |
cbf316f2 | 934 | NET_BUF *Nbuf;\r |
935 | UINT32 Index;\r | |
936 | UINT32 Current;\r | |
937 | \r | |
938 | //\r | |
939 | //Compute how many blocks are there\r | |
940 | //\r | |
941 | FragmentNum = 0;\r | |
942 | \r | |
943 | NET_LIST_FOR_EACH (Entry, BufList) {\r | |
944 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
945 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
946 | FragmentNum += Nbuf->BlockOpNum;\r | |
947 | }\r | |
948 | \r | |
949 | //\r | |
950 | //Allocate and copy block points\r | |
951 | //\r | |
e48e37fc | 952 | Fragment = AllocatePool (sizeof (NET_FRAGMENT) * FragmentNum);\r |
cbf316f2 | 953 | \r |
954 | if (Fragment == NULL) {\r | |
955 | return NULL;\r | |
956 | }\r | |
957 | \r | |
958 | Current = 0;\r | |
959 | \r | |
960 | NET_LIST_FOR_EACH (Entry, BufList) {\r | |
961 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
962 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
963 | \r | |
964 | for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {\r | |
965 | if (Nbuf->BlockOp[Index].Size) {\r | |
966 | Fragment[Current].Bulk = Nbuf->BlockOp[Index].Head;\r | |
967 | Fragment[Current].Len = Nbuf->BlockOp[Index].Size;\r | |
968 | Current++;\r | |
969 | }\r | |
970 | }\r | |
971 | }\r | |
972 | \r | |
973 | Nbuf = NetbufFromExt (Fragment, Current, HeadSpace, HeaderLen, ExtFree, Arg);\r | |
e48e37fc | 974 | gBS->FreePool (Fragment);\r |
cbf316f2 | 975 | \r |
976 | return Nbuf;\r | |
977 | }\r | |
978 | \r | |
979 | \r | |
980 | /**\r | |
981 | Reserve some space in the header room of the buffer.\r | |
982 | Upon allocation, all the space are in the tail room\r | |
983 | of the buffer. Call this function to move some space\r | |
984 | to the header room. This function is quite limited in\r | |
985 | that it can only reserver space from the first block\r | |
986 | of an empty NET_BUF not built from the external. But\r | |
987 | it should be enough for the network stack.\r | |
988 | \r | |
989 | @param Nbuf Pointer to the net buffer.\r | |
990 | @param Len The length of buffer to be reserverd.\r | |
991 | \r | |
992 | @return None.\r | |
993 | \r | |
994 | **/\r | |
995 | VOID\r | |
7b414b4e | 996 | EFIAPI\r |
cbf316f2 | 997 | NetbufReserve (\r |
998 | IN NET_BUF *Nbuf,\r | |
999 | IN UINT32 Len\r | |
1000 | )\r | |
1001 | {\r | |
1002 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1003 | NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);\r | |
1004 | \r | |
1005 | ASSERT ((Nbuf->BlockOpNum == 1) && (Nbuf->TotalSize == 0));\r | |
1006 | ASSERT ((Nbuf->Vector->Free == NULL) && (Nbuf->Vector->Len >= Len));\r | |
1007 | \r | |
1008 | Nbuf->BlockOp[0].Head += Len;\r | |
1009 | Nbuf->BlockOp[0].Tail += Len;\r | |
1010 | \r | |
1011 | ASSERT (Nbuf->BlockOp[0].Tail <= Nbuf->BlockOp[0].BlockTail);\r | |
1012 | }\r | |
1013 | \r | |
1014 | \r | |
1015 | /**\r | |
1016 | Allocate some space from the header or tail of the buffer.\r | |
1017 | \r | |
1018 | @param Nbuf Pointer to the net buffer.\r | |
1019 | @param Len The length of the buffer to be allocated.\r | |
1020 | @param FromHead The flag to indicate whether reserve the data from\r | |
1021 | head or tail. TRUE for from head, and FALSE for\r | |
1022 | from tail.\r | |
1023 | \r | |
1024 | @retval * Pointer to the first byte of the allocated buffer.\r | |
1025 | \r | |
1026 | **/\r | |
1027 | UINT8 *\r | |
7b414b4e | 1028 | EFIAPI\r |
cbf316f2 | 1029 | NetbufAllocSpace (\r |
1030 | IN NET_BUF *Nbuf,\r | |
1031 | IN UINT32 Len,\r | |
1032 | IN BOOLEAN FromHead\r | |
1033 | )\r | |
1034 | {\r | |
1035 | NET_BLOCK_OP *BlockOp;\r | |
1036 | UINT32 Index;\r | |
1037 | UINT8 *SavedTail;\r | |
1038 | \r | |
1039 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1040 | NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);\r | |
1041 | \r | |
1042 | ASSERT (Len > 0);\r | |
1043 | \r | |
1044 | if (FromHead) {\r | |
1045 | //\r | |
1046 | // Allocate some space from head. If the buffer is empty,\r | |
1047 | // allocate from the first block. If it isn't, allocate\r | |
1048 | // from the first non-empty block, or the block before that.\r | |
1049 | //\r | |
1050 | if (Nbuf->TotalSize == 0) {\r | |
1051 | Index = 0;\r | |
1052 | } else {\r | |
1053 | NetbufGetByte (Nbuf, 0, &Index);\r | |
1054 | \r | |
1055 | if ((NET_HEADSPACE(&(Nbuf->BlockOp[Index])) < Len) && (Index > 0)) {\r | |
1056 | Index--;\r | |
1057 | }\r | |
1058 | }\r | |
1059 | \r | |
1060 | BlockOp = &(Nbuf->BlockOp[Index]);\r | |
1061 | \r | |
1062 | if (NET_HEADSPACE (BlockOp) < Len) {\r | |
1063 | return NULL;\r | |
1064 | }\r | |
1065 | \r | |
1066 | BlockOp->Head -= Len;\r | |
1067 | BlockOp->Size += Len;\r | |
1068 | Nbuf->TotalSize += Len;\r | |
1069 | \r | |
1070 | return BlockOp->Head;\r | |
1071 | \r | |
1072 | } else {\r | |
1073 | //\r | |
1074 | // Allocate some space from the tail. If the buffer is empty,\r | |
1075 | // allocate from the first block. If it isn't, allocate\r | |
1076 | // from the last non-empty block, or the block after that.\r | |
1077 | //\r | |
1078 | if (Nbuf->TotalSize == 0) {\r | |
1079 | Index = 0;\r | |
1080 | } else {\r | |
1081 | NetbufGetByte (Nbuf, Nbuf->TotalSize - 1, &Index);\r | |
1082 | \r | |
1083 | if ((NET_TAILSPACE(&(Nbuf->BlockOp[Index])) < Len) &&\r | |
1084 | (Index < Nbuf->BlockOpNum - 1)) {\r | |
1085 | \r | |
1086 | Index++;\r | |
1087 | }\r | |
1088 | }\r | |
1089 | \r | |
1090 | BlockOp = &(Nbuf->BlockOp[Index]);\r | |
1091 | \r | |
1092 | if (NET_TAILSPACE (BlockOp) < Len) {\r | |
1093 | return NULL;\r | |
1094 | }\r | |
1095 | \r | |
1096 | SavedTail = BlockOp->Tail;\r | |
1097 | \r | |
1098 | BlockOp->Tail += Len;\r | |
1099 | BlockOp->Size += Len;\r | |
1100 | Nbuf->TotalSize += Len;\r | |
1101 | \r | |
1102 | return SavedTail;\r | |
1103 | }\r | |
1104 | }\r | |
1105 | \r | |
1106 | \r | |
1107 | /**\r | |
1108 | Trim a single NET_BLOCK.\r | |
1109 | \r | |
1110 | @param BlockOp Pointer to the NET_BLOCK.\r | |
1111 | @param Len The length of the data to be trimmed.\r | |
1112 | @param FromHead The flag to indicate whether trim data from head or\r | |
1113 | tail. TRUE for from head, and FALSE for from tail.\r | |
1114 | \r | |
1115 | @return None.\r | |
1116 | \r | |
1117 | **/\r | |
cbf316f2 | 1118 | VOID\r |
1119 | NetblockTrim (\r | |
1120 | IN NET_BLOCK_OP *BlockOp,\r | |
1121 | IN UINT32 Len,\r | |
1122 | IN BOOLEAN FromHead\r | |
1123 | )\r | |
1124 | {\r | |
1125 | ASSERT (BlockOp && (BlockOp->Size >= Len));\r | |
1126 | \r | |
1127 | BlockOp->Size -= Len;\r | |
1128 | \r | |
1129 | if (FromHead) {\r | |
1130 | BlockOp->Head += Len;\r | |
1131 | } else {\r | |
1132 | BlockOp->Tail -= Len;\r | |
1133 | }\r | |
1134 | }\r | |
1135 | \r | |
1136 | \r | |
1137 | /**\r | |
1138 | Trim some data from the header or tail of the buffer.\r | |
1139 | \r | |
1140 | @param Nbuf Pointer to the net buffer.\r | |
1141 | @param Len The length of the data to be trimmed.\r | |
1142 | @param FromHead The flag to indicate whether trim data from head or\r | |
1143 | tail. TRUE for from head, and FALSE for from tail.\r | |
1144 | \r | |
1145 | @retval UINTN Length of the actually trimmed data.\r | |
1146 | \r | |
1147 | **/\r | |
1148 | UINT32\r | |
7b414b4e | 1149 | EFIAPI\r |
cbf316f2 | 1150 | NetbufTrim (\r |
1151 | IN NET_BUF *Nbuf,\r | |
1152 | IN UINT32 Len,\r | |
1153 | IN BOOLEAN FromHead\r | |
1154 | )\r | |
1155 | {\r | |
1156 | NET_BLOCK_OP *BlockOp;\r | |
1157 | UINT32 Index;\r | |
1158 | UINT32 Trimmed;\r | |
1159 | \r | |
1160 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1161 | \r | |
1162 | if (Len > Nbuf->TotalSize) {\r | |
1163 | Len = Nbuf->TotalSize;\r | |
1164 | }\r | |
1165 | \r | |
1166 | //\r | |
1167 | // If FromTail is true, iterate backward. That\r | |
1168 | // is, init Index to NBuf->BlockNum - 1, and\r | |
1169 | // decrease it by 1 during each loop. Otherwise,\r | |
1170 | // iterate forward. That is, init Index to 0, and\r | |
1171 | // increase it by 1 during each loop.\r | |
1172 | //\r | |
1173 | Trimmed = 0;\r | |
1174 | Nbuf->TotalSize -= Len;\r | |
1175 | \r | |
1176 | Index = (FromHead ? 0 : Nbuf->BlockOpNum - 1);\r | |
1177 | BlockOp = Nbuf->BlockOp;\r | |
1178 | \r | |
1179 | for (;;) {\r | |
1180 | if (BlockOp[Index].Size == 0) {\r | |
1181 | Index += (FromHead ? 1 : -1);\r | |
1182 | continue;\r | |
1183 | }\r | |
1184 | \r | |
1185 | if (Len > BlockOp[Index].Size) {\r | |
1186 | Len -= BlockOp[Index].Size;\r | |
1187 | Trimmed += BlockOp[Index].Size;\r | |
1188 | NetblockTrim (&BlockOp[Index], BlockOp[Index].Size, FromHead);\r | |
1189 | } else {\r | |
1190 | Trimmed += Len;\r | |
1191 | NetblockTrim (&BlockOp[Index], Len, FromHead);\r | |
1192 | break;\r | |
1193 | }\r | |
1194 | \r | |
1195 | Index += (FromHead ? 1 : -1);\r | |
1196 | }\r | |
1197 | \r | |
1198 | return Trimmed;\r | |
1199 | }\r | |
1200 | \r | |
1201 | \r | |
1202 | /**\r | |
1203 | Copy the data from the specific offset to the destination.\r | |
1204 | \r | |
1205 | @param Nbuf Pointer to the net buffer.\r | |
1206 | @param Offset The sequence number of the first byte to copy.\r | |
1207 | @param Len Length of the data to copy.\r | |
1208 | @param Dest The destination of the data to copy to.\r | |
1209 | \r | |
1210 | @retval UINTN The length of the copied data.\r | |
1211 | \r | |
1212 | **/\r | |
1213 | UINT32\r | |
7b414b4e | 1214 | EFIAPI\r |
cbf316f2 | 1215 | NetbufCopy (\r |
1216 | IN NET_BUF *Nbuf,\r | |
1217 | IN UINT32 Offset,\r | |
1218 | IN UINT32 Len,\r | |
1219 | IN UINT8 *Dest\r | |
1220 | )\r | |
1221 | {\r | |
1222 | NET_BLOCK_OP *BlockOp;\r | |
1223 | UINT32 Skip;\r | |
1224 | UINT32 Left;\r | |
1225 | UINT32 Copied;\r | |
1226 | UINT32 Index;\r | |
1227 | UINT32 Cur;\r | |
1228 | \r | |
1229 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1230 | ASSERT (Dest);\r | |
1231 | \r | |
1232 | if ((Len == 0) || (Nbuf->TotalSize <= Offset)) {\r | |
1233 | return 0;\r | |
1234 | }\r | |
1235 | \r | |
1236 | if (Nbuf->TotalSize - Offset < Len) {\r | |
1237 | Len = Nbuf->TotalSize - Offset;\r | |
1238 | }\r | |
1239 | \r | |
1240 | BlockOp = Nbuf->BlockOp;\r | |
1241 | \r | |
1242 | //\r | |
1243 | // Skip to the offset. Don't make "Offset-By-One" error here.\r | |
1244 | // Cur + BLOCK.SIZE is the first sequence number of next block.\r | |
1245 | // So, (Offset < Cur + BLOCK.SIZE) means that the first byte\r | |
1246 | // is in the current block. if (Offset == Cur + BLOCK.SIZE), the\r | |
1247 | // first byte is the next block's first byte.\r | |
1248 | //\r | |
1249 | Cur = 0;\r | |
1250 | \r | |
1251 | for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {\r | |
1252 | if (BlockOp[Index].Size == 0) {\r | |
1253 | continue;\r | |
1254 | }\r | |
1255 | \r | |
1256 | if (Offset < Cur + BlockOp[Index].Size) {\r | |
1257 | break;\r | |
1258 | }\r | |
1259 | \r | |
1260 | Cur += BlockOp[Index].Size;\r | |
1261 | }\r | |
1262 | \r | |
1263 | //\r | |
1264 | // Cur is the sequence number of the first byte in the block\r | |
1265 | // Offset - Cur is the number of bytes before first byte to\r | |
1266 | // to copy in the current block.\r | |
1267 | //\r | |
1268 | Skip = Offset - Cur;\r | |
1269 | Left = BlockOp[Index].Size - Skip;\r | |
1270 | \r | |
1271 | if (Len <= Left) {\r | |
e48e37fc | 1272 | CopyMem (Dest, BlockOp[Index].Head + Skip, Len);\r |
cbf316f2 | 1273 | return Len;\r |
1274 | }\r | |
1275 | \r | |
e48e37fc | 1276 | CopyMem (Dest, BlockOp[Index].Head + Skip, Left);\r |
cbf316f2 | 1277 | \r |
1278 | Dest += Left;\r | |
1279 | Len -= Left;\r | |
1280 | Copied = Left;\r | |
1281 | \r | |
1282 | Index++;\r | |
1283 | \r | |
1284 | for (; Index < Nbuf->BlockOpNum; Index++) {\r | |
1285 | if (Len > BlockOp[Index].Size) {\r | |
1286 | Len -= BlockOp[Index].Size;\r | |
1287 | Copied += BlockOp[Index].Size;\r | |
1288 | \r | |
e48e37fc | 1289 | CopyMem (Dest, BlockOp[Index].Head, BlockOp[Index].Size);\r |
cbf316f2 | 1290 | Dest += BlockOp[Index].Size;\r |
1291 | } else {\r | |
1292 | Copied += Len;\r | |
e48e37fc | 1293 | CopyMem (Dest, BlockOp[Index].Head, Len);\r |
cbf316f2 | 1294 | break;\r |
1295 | }\r | |
1296 | }\r | |
1297 | \r | |
1298 | return Copied;\r | |
1299 | }\r | |
1300 | \r | |
1301 | \r | |
1302 | /**\r | |
1303 | Initiate the net buffer queue.\r | |
1304 | \r | |
1305 | @param NbufQue Pointer to the net buffer queue to be initiated.\r | |
1306 | \r | |
1307 | @return None.\r | |
1308 | \r | |
1309 | **/\r | |
1310 | VOID\r | |
7b414b4e | 1311 | EFIAPI\r |
cbf316f2 | 1312 | NetbufQueInit (\r |
1313 | IN NET_BUF_QUEUE *NbufQue\r | |
1314 | )\r | |
1315 | {\r | |
1316 | NbufQue->Signature = NET_QUE_SIGNATURE;\r | |
1317 | NbufQue->RefCnt = 1;\r | |
e48e37fc | 1318 | InitializeListHead (&NbufQue->List);\r |
cbf316f2 | 1319 | \r |
e48e37fc | 1320 | InitializeListHead (&NbufQue->BufList);\r |
cbf316f2 | 1321 | NbufQue->BufSize = 0;\r |
1322 | NbufQue->BufNum = 0;\r | |
1323 | }\r | |
1324 | \r | |
1325 | \r | |
1326 | /**\r | |
1327 | Allocate an initialized net buffer queue.\r | |
1328 | \r | |
1329 | None.\r | |
1330 | \r | |
1331 | @retval * Pointer to the allocated net buffer queue.\r | |
1332 | \r | |
1333 | **/\r | |
1334 | NET_BUF_QUEUE *\r | |
7b414b4e | 1335 | EFIAPI\r |
cbf316f2 | 1336 | NetbufQueAlloc (\r |
1337 | VOID\r | |
1338 | )\r | |
1339 | {\r | |
1340 | NET_BUF_QUEUE *NbufQue;\r | |
1341 | \r | |
e48e37fc | 1342 | NbufQue = AllocatePool (sizeof (NET_BUF_QUEUE));\r |
cbf316f2 | 1343 | if (NbufQue == NULL) {\r |
1344 | return NULL;\r | |
1345 | }\r | |
1346 | \r | |
1347 | NetbufQueInit (NbufQue);\r | |
1348 | \r | |
1349 | return NbufQue;\r | |
1350 | }\r | |
1351 | \r | |
1352 | \r | |
1353 | /**\r | |
1354 | Free a net buffer queue.\r | |
1355 | \r | |
1356 | @param NbufQue Poitner to the net buffer queue to be freed.\r | |
1357 | \r | |
1358 | @return None.\r | |
1359 | \r | |
1360 | **/\r | |
1361 | VOID\r | |
7b414b4e | 1362 | EFIAPI\r |
cbf316f2 | 1363 | NetbufQueFree (\r |
1364 | IN NET_BUF_QUEUE *NbufQue\r | |
1365 | )\r | |
1366 | {\r | |
1367 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1368 | \r | |
1369 | NbufQue->RefCnt--;\r | |
1370 | \r | |
1371 | if (NbufQue->RefCnt == 0) {\r | |
1372 | NetbufQueFlush (NbufQue);\r | |
e48e37fc | 1373 | gBS->FreePool (NbufQue);\r |
cbf316f2 | 1374 | }\r |
1375 | }\r | |
1376 | \r | |
1377 | \r | |
1378 | /**\r | |
1379 | Append a buffer to the end of the queue.\r | |
1380 | \r | |
1381 | @param NbufQue Pointer to the net buffer queue.\r | |
1382 | @param Nbuf Pointer to the net buffer to be appended.\r | |
1383 | \r | |
1384 | @return None.\r | |
1385 | \r | |
1386 | **/\r | |
1387 | VOID\r | |
7b414b4e | 1388 | EFIAPI\r |
cbf316f2 | 1389 | NetbufQueAppend (\r |
1390 | IN NET_BUF_QUEUE *NbufQue,\r | |
1391 | IN NET_BUF *Nbuf\r | |
1392 | )\r | |
1393 | {\r | |
1394 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1395 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1396 | \r | |
e48e37fc | 1397 | InsertTailList (&NbufQue->BufList, &Nbuf->List);\r |
cbf316f2 | 1398 | \r |
1399 | NbufQue->BufSize += Nbuf->TotalSize;\r | |
1400 | NbufQue->BufNum++;\r | |
1401 | }\r | |
1402 | \r | |
1403 | \r | |
1404 | /**\r | |
1405 | Remove a net buffer from head in the specific queue.\r | |
1406 | \r | |
1407 | @param NbufQue Pointer to the net buffer queue.\r | |
1408 | \r | |
1409 | @retval * Pointer to the net buffer removed from the specific\r | |
1410 | queue.\r | |
1411 | \r | |
1412 | **/\r | |
1413 | NET_BUF *\r | |
7b414b4e | 1414 | EFIAPI\r |
cbf316f2 | 1415 | NetbufQueRemove (\r |
1416 | IN NET_BUF_QUEUE *NbufQue\r | |
1417 | )\r | |
1418 | {\r | |
1419 | NET_BUF *First;\r | |
1420 | \r | |
1421 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1422 | \r | |
1423 | if (NbufQue->BufNum == 0) {\r | |
1424 | return NULL;\r | |
1425 | }\r | |
1426 | \r | |
1427 | First = NET_LIST_USER_STRUCT (NbufQue->BufList.ForwardLink, NET_BUF, List);\r | |
1428 | \r | |
1429 | NetListRemoveHead (&NbufQue->BufList);\r | |
1430 | \r | |
1431 | NbufQue->BufSize -= First->TotalSize;\r | |
1432 | NbufQue->BufNum--;\r | |
1433 | return First;\r | |
1434 | }\r | |
1435 | \r | |
1436 | \r | |
1437 | /**\r | |
1438 | Copy some data from the buffer queue to the destination.\r | |
1439 | \r | |
1440 | @param NbufQue Pointer to the net buffer queue.\r | |
1441 | @param Offset The sequence number of the first byte to copy.\r | |
1442 | @param Len Length of the data to copy.\r | |
1443 | @param Dest The destination of the data to copy to.\r | |
1444 | \r | |
1445 | @retval UINTN The length of the copied data.\r | |
1446 | \r | |
1447 | **/\r | |
1448 | UINT32\r | |
1449 | NetbufQueCopy (\r | |
1450 | IN NET_BUF_QUEUE *NbufQue,\r | |
1451 | IN UINT32 Offset,\r | |
1452 | IN UINT32 Len,\r | |
1453 | IN UINT8 *Dest\r | |
1454 | )\r | |
1455 | {\r | |
e48e37fc | 1456 | LIST_ENTRY *Entry;\r |
cbf316f2 | 1457 | NET_BUF *Nbuf;\r |
1458 | UINT32 Skip;\r | |
1459 | UINT32 Left;\r | |
1460 | UINT32 Cur;\r | |
1461 | UINT32 Copied;\r | |
1462 | \r | |
1463 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1464 | ASSERT (Dest != NULL);\r | |
1465 | \r | |
1466 | if ((Len == 0) || (NbufQue->BufSize <= Offset)) {\r | |
1467 | return 0;\r | |
1468 | }\r | |
1469 | \r | |
1470 | if (NbufQue->BufSize - Offset < Len) {\r | |
1471 | Len = NbufQue->BufSize - Offset;\r | |
1472 | }\r | |
1473 | \r | |
1474 | //\r | |
1475 | // skip to the Offset\r | |
1476 | //\r | |
1477 | Cur = 0;\r | |
1478 | Nbuf = NULL;\r | |
1479 | \r | |
1480 | NET_LIST_FOR_EACH (Entry, &NbufQue->BufList) {\r | |
1481 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1482 | \r | |
1483 | if (Offset < Cur + Nbuf->TotalSize) {\r | |
1484 | break;\r | |
1485 | }\r | |
1486 | \r | |
1487 | Cur += Nbuf->TotalSize;\r | |
1488 | }\r | |
1489 | \r | |
1490 | //\r | |
1491 | // Copy the data in the first buffer.\r | |
1492 | //\r | |
1493 | Skip = Offset - Cur;\r | |
1494 | Left = Nbuf->TotalSize - Skip;\r | |
1495 | \r | |
1496 | if (Len < Left) {\r | |
1497 | return NetbufCopy (Nbuf, Skip, Len, Dest);\r | |
1498 | }\r | |
1499 | \r | |
1500 | NetbufCopy (Nbuf, Skip, Left, Dest);\r | |
1501 | Dest += Left;\r | |
1502 | Len -= Left;\r | |
1503 | Copied = Left;\r | |
1504 | \r | |
1505 | //\r | |
1506 | // Iterate over the others\r | |
1507 | //\r | |
1508 | Entry = Entry->ForwardLink;\r | |
1509 | \r | |
1510 | while ((Len > 0) && (Entry != &NbufQue->BufList)) {\r | |
1511 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1512 | \r | |
1513 | if (Len > Nbuf->TotalSize) {\r | |
1514 | Len -= Nbuf->TotalSize;\r | |
1515 | Copied += Nbuf->TotalSize;\r | |
1516 | \r | |
1517 | NetbufCopy (Nbuf, 0, Nbuf->TotalSize, Dest);\r | |
1518 | Dest += Nbuf->TotalSize;\r | |
1519 | \r | |
1520 | } else {\r | |
1521 | NetbufCopy (Nbuf, 0, Len, Dest);\r | |
1522 | Copied += Len;\r | |
1523 | break;\r | |
1524 | }\r | |
1525 | \r | |
1526 | Entry = Entry->ForwardLink;\r | |
1527 | }\r | |
1528 | \r | |
1529 | return Copied;\r | |
1530 | }\r | |
1531 | \r | |
1532 | \r | |
1533 | /**\r | |
1534 | Trim some data from the queue header, release the buffer if\r | |
1535 | whole buffer is trimmed.\r | |
1536 | \r | |
1537 | @param NbufQue Pointer to the net buffer queue.\r | |
1538 | @param Len Length of the data to trim.\r | |
1539 | \r | |
1540 | @retval UINTN The length of the data trimmed.\r | |
1541 | \r | |
1542 | **/\r | |
1543 | UINT32\r | |
7b414b4e | 1544 | EFIAPI\r |
cbf316f2 | 1545 | NetbufQueTrim (\r |
1546 | IN NET_BUF_QUEUE *NbufQue,\r | |
1547 | IN UINT32 Len\r | |
1548 | )\r | |
1549 | {\r | |
e48e37fc | 1550 | LIST_ENTRY *Entry;\r |
1551 | LIST_ENTRY *Next;\r | |
cbf316f2 | 1552 | NET_BUF *Nbuf;\r |
1553 | UINT32 Trimmed;\r | |
1554 | \r | |
1555 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1556 | \r | |
1557 | if (Len == 0) {\r | |
1558 | return 0;\r | |
1559 | }\r | |
1560 | \r | |
1561 | if (Len > NbufQue->BufSize) {\r | |
1562 | Len = NbufQue->BufSize;\r | |
1563 | }\r | |
1564 | \r | |
1565 | NbufQue->BufSize -= Len;\r | |
1566 | Trimmed = 0;\r | |
1567 | \r | |
1568 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &NbufQue->BufList) {\r | |
1569 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1570 | \r | |
1571 | if (Len >= Nbuf->TotalSize) {\r | |
1572 | Trimmed += Nbuf->TotalSize;\r | |
1573 | Len -= Nbuf->TotalSize;\r | |
1574 | \r | |
e48e37fc | 1575 | RemoveEntryList (Entry);\r |
cbf316f2 | 1576 | NetbufFree (Nbuf);\r |
1577 | \r | |
1578 | NbufQue->BufNum--;\r | |
1579 | \r | |
1580 | if (Len == 0) {\r | |
1581 | break;\r | |
1582 | }\r | |
1583 | \r | |
1584 | } else {\r | |
1585 | Trimmed += NetbufTrim (Nbuf, Len, NET_BUF_HEAD);\r | |
1586 | break;\r | |
1587 | }\r | |
1588 | }\r | |
1589 | \r | |
1590 | return Trimmed;\r | |
1591 | }\r | |
1592 | \r | |
1593 | \r | |
1594 | /**\r | |
1595 | Flush the net buffer queue.\r | |
1596 | \r | |
1597 | @param NbufQue Pointer to the queue to be flushed.\r | |
1598 | \r | |
1599 | @return None.\r | |
1600 | \r | |
1601 | **/\r | |
1602 | VOID\r | |
7b414b4e | 1603 | EFIAPI\r |
cbf316f2 | 1604 | NetbufQueFlush (\r |
1605 | IN NET_BUF_QUEUE *NbufQue\r | |
1606 | )\r | |
1607 | {\r | |
1608 | NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);\r | |
1609 | \r | |
1610 | NetbufFreeList (&NbufQue->BufList);\r | |
1611 | \r | |
1612 | NbufQue->BufNum = 0;\r | |
1613 | NbufQue->BufSize = 0;\r | |
1614 | }\r | |
1615 | \r | |
1616 | \r | |
1617 | /**\r | |
1618 | Compute checksum for a bulk of data.\r | |
1619 | \r | |
1620 | @param Bulk Pointer to the data.\r | |
1621 | @param Len Length of the data, in bytes.\r | |
1622 | \r | |
1623 | @retval UINT16 The computed checksum.\r | |
1624 | \r | |
1625 | **/\r | |
1626 | UINT16\r | |
7b414b4e | 1627 | EFIAPI\r |
cbf316f2 | 1628 | NetblockChecksum (\r |
1629 | IN UINT8 *Bulk,\r | |
1630 | IN UINT32 Len\r | |
1631 | )\r | |
1632 | {\r | |
1633 | register UINT32 Sum;\r | |
1634 | \r | |
1635 | Sum = 0;\r | |
1636 | \r | |
1637 | while (Len > 1) {\r | |
1638 | Sum += *(UINT16 *) Bulk;\r | |
1639 | Bulk += 2;\r | |
1640 | Len -= 2;\r | |
1641 | }\r | |
1642 | \r | |
1643 | //\r | |
1644 | // Add left-over byte, if any\r | |
1645 | //\r | |
1646 | if (Len > 0) {\r | |
1647 | Sum += *(UINT8 *) Bulk;\r | |
1648 | }\r | |
1649 | \r | |
1650 | //\r | |
1651 | // Fold 32-bit sum to 16 bits\r | |
1652 | //\r | |
1653 | while (Sum >> 16) {\r | |
1654 | Sum = (Sum & 0xffff) + (Sum >> 16);\r | |
1655 | \r | |
1656 | }\r | |
1657 | \r | |
1658 | return (UINT16) Sum;\r | |
1659 | }\r | |
1660 | \r | |
1661 | \r | |
1662 | /**\r | |
1663 | Add two checksums.\r | |
1664 | \r | |
1665 | @param Checksum1 The first checksum to be added.\r | |
1666 | @param Checksum2 The second checksum to be added.\r | |
1667 | \r | |
1668 | @retval UINT16 The new checksum.\r | |
1669 | \r | |
1670 | **/\r | |
1671 | UINT16\r | |
7b414b4e | 1672 | EFIAPI\r |
cbf316f2 | 1673 | NetAddChecksum (\r |
1674 | IN UINT16 Checksum1,\r | |
1675 | IN UINT16 Checksum2\r | |
1676 | )\r | |
1677 | {\r | |
1678 | UINT32 Sum;\r | |
1679 | \r | |
1680 | Sum = Checksum1 + Checksum2;\r | |
1681 | \r | |
1682 | //\r | |
1683 | // two UINT16 can only add up to a carry of 1.\r | |
1684 | //\r | |
1685 | if (Sum >> 16) {\r | |
1686 | Sum = (Sum & 0xffff) + 1;\r | |
1687 | \r | |
1688 | }\r | |
1689 | \r | |
1690 | return (UINT16) Sum;\r | |
1691 | }\r | |
1692 | \r | |
1693 | \r | |
1694 | /**\r | |
1695 | Compute the checksum for a NET_BUF.\r | |
1696 | \r | |
1697 | @param Nbuf Pointer to the net buffer.\r | |
1698 | \r | |
1699 | @retval UINT16 The computed checksum.\r | |
1700 | \r | |
1701 | **/\r | |
1702 | UINT16\r | |
7b414b4e | 1703 | EFIAPI\r |
cbf316f2 | 1704 | NetbufChecksum (\r |
1705 | IN NET_BUF *Nbuf\r | |
1706 | )\r | |
1707 | {\r | |
1708 | NET_BLOCK_OP *BlockOp;\r | |
1709 | UINT32 Offset;\r | |
1710 | UINT16 TotalSum;\r | |
1711 | UINT16 BlockSum;\r | |
1712 | UINT32 Index;\r | |
1713 | \r | |
1714 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1715 | \r | |
1716 | TotalSum = 0;\r | |
1717 | Offset = 0;\r | |
1718 | BlockOp = Nbuf->BlockOp;\r | |
1719 | \r | |
1720 | for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {\r | |
1721 | if (BlockOp[Index].Size == 0) {\r | |
1722 | continue;\r | |
1723 | }\r | |
1724 | \r | |
1725 | BlockSum = NetblockChecksum (BlockOp[Index].Head, BlockOp[Index].Size);\r | |
1726 | \r | |
1727 | if (Offset & 0x01) {\r | |
1728 | //\r | |
1729 | // The checksum starts with an odd byte, swap\r | |
1730 | // the checksum before added to total checksum\r | |
1731 | //\r | |
4eb65aff | 1732 | BlockSum = (UINT16) NET_SWAP_SHORT (BlockSum);\r |
cbf316f2 | 1733 | }\r |
1734 | \r | |
1735 | TotalSum = NetAddChecksum (BlockSum, TotalSum);\r | |
1736 | Offset += BlockOp[Index].Size;\r | |
1737 | }\r | |
1738 | \r | |
1739 | return TotalSum;\r | |
1740 | }\r | |
1741 | \r | |
1742 | \r | |
1743 | /**\r | |
1744 | Compute the checksum for TCP/UDP pseudo header.\r | |
1745 | Src, Dst are in network byte order. and Len is\r | |
1746 | in host byte order.\r | |
1747 | \r | |
1748 | @param Src The source address of the packet.\r | |
1749 | @param Dst The destination address of the packet.\r | |
1750 | @param Proto The protocol type of the packet.\r | |
1751 | @param Len The length of the packet.\r | |
1752 | \r | |
1753 | @retval UINT16 The computed checksum.\r | |
1754 | \r | |
1755 | **/\r | |
1756 | UINT16\r | |
7b414b4e | 1757 | EFIAPI\r |
cbf316f2 | 1758 | NetPseudoHeadChecksum (\r |
1759 | IN IP4_ADDR Src,\r | |
1760 | IN IP4_ADDR Dst,\r | |
1761 | IN UINT8 Proto,\r | |
1762 | IN UINT16 Len\r | |
1763 | )\r | |
1764 | {\r | |
1765 | NET_PSEUDO_HDR Hdr;\r | |
1766 | \r | |
1767 | //\r | |
1768 | // Zero the memory to relieve align problems\r | |
1769 | //\r | |
e48e37fc | 1770 | ZeroMem (&Hdr, sizeof (Hdr));\r |
cbf316f2 | 1771 | \r |
1772 | Hdr.SrcIp = Src;\r | |
1773 | Hdr.DstIp = Dst;\r | |
1774 | Hdr.Protocol = Proto;\r | |
1775 | Hdr.Len = HTONS (Len);\r | |
1776 | \r | |
1777 | return NetblockChecksum ((UINT8 *) &Hdr, sizeof (Hdr));\r | |
1778 | }\r |