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1 | /** @file\r | |
2 | IP4 input process.\r | |
3 | \r | |
4 | Copyright (c) 2005 - 2020, Intel Corporation. All rights reserved.<BR>\r | |
5 | (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>\r | |
6 | \r | |
7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
8 | \r | |
9 | **/\r | |
10 | \r | |
11 | #include "Ip4Impl.h"\r | |
12 | \r | |
13 | \r | |
14 | /**\r | |
15 | Create an empty assemble entry for the packet identified by\r | |
16 | (Dst, Src, Id, Protocol). The default life for the packet is\r | |
17 | 120 seconds.\r | |
18 | \r | |
19 | @param[in] Dst The destination address\r | |
20 | @param[in] Src The source address\r | |
21 | @param[in] Id The ID field in IP header\r | |
22 | @param[in] Protocol The protocol field in IP header\r | |
23 | \r | |
24 | @return NULL if failed to allocate memory for the entry, otherwise\r | |
25 | the point to just created reassemble entry.\r | |
26 | \r | |
27 | **/\r | |
28 | IP4_ASSEMBLE_ENTRY *\r | |
29 | Ip4CreateAssembleEntry (\r | |
30 | IN IP4_ADDR Dst,\r | |
31 | IN IP4_ADDR Src,\r | |
32 | IN UINT16 Id,\r | |
33 | IN UINT8 Protocol\r | |
34 | )\r | |
35 | {\r | |
36 | \r | |
37 | IP4_ASSEMBLE_ENTRY *Assemble;\r | |
38 | \r | |
39 | Assemble = AllocatePool (sizeof (IP4_ASSEMBLE_ENTRY));\r | |
40 | \r | |
41 | if (Assemble == NULL) {\r | |
42 | return NULL;\r | |
43 | }\r | |
44 | \r | |
45 | InitializeListHead (&Assemble->Link);\r | |
46 | InitializeListHead (&Assemble->Fragments);\r | |
47 | \r | |
48 | Assemble->Dst = Dst;\r | |
49 | Assemble->Src = Src;\r | |
50 | Assemble->Id = Id;\r | |
51 | Assemble->Protocol = Protocol;\r | |
52 | Assemble->TotalLen = 0;\r | |
53 | Assemble->CurLen = 0;\r | |
54 | Assemble->Head = NULL;\r | |
55 | Assemble->Info = NULL;\r | |
56 | Assemble->Life = IP4_FRAGMENT_LIFE;\r | |
57 | \r | |
58 | return Assemble;\r | |
59 | }\r | |
60 | \r | |
61 | \r | |
62 | /**\r | |
63 | Release all the fragments of a packet, then free the assemble entry.\r | |
64 | \r | |
65 | @param[in] Assemble The assemble entry to free\r | |
66 | \r | |
67 | **/\r | |
68 | VOID\r | |
69 | Ip4FreeAssembleEntry (\r | |
70 | IN IP4_ASSEMBLE_ENTRY *Assemble\r | |
71 | )\r | |
72 | {\r | |
73 | LIST_ENTRY *Entry;\r | |
74 | LIST_ENTRY *Next;\r | |
75 | NET_BUF *Fragment;\r | |
76 | \r | |
77 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &Assemble->Fragments) {\r | |
78 | Fragment = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
79 | \r | |
80 | RemoveEntryList (Entry);\r | |
81 | NetbufFree (Fragment);\r | |
82 | }\r | |
83 | \r | |
84 | FreePool (Assemble);\r | |
85 | }\r | |
86 | \r | |
87 | \r | |
88 | /**\r | |
89 | Initialize an already allocated assemble table. This is generally\r | |
90 | the assemble table embedded in the IP4 service instance.\r | |
91 | \r | |
92 | @param[in, out] Table The assemble table to initialize.\r | |
93 | \r | |
94 | **/\r | |
95 | VOID\r | |
96 | Ip4InitAssembleTable (\r | |
97 | IN OUT IP4_ASSEMBLE_TABLE *Table\r | |
98 | )\r | |
99 | {\r | |
100 | UINT32 Index;\r | |
101 | \r | |
102 | for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {\r | |
103 | InitializeListHead (&Table->Bucket[Index]);\r | |
104 | }\r | |
105 | }\r | |
106 | \r | |
107 | \r | |
108 | /**\r | |
109 | Clean up the assemble table: remove all the fragments\r | |
110 | and assemble entries.\r | |
111 | \r | |
112 | @param[in] Table The assemble table to clean up\r | |
113 | \r | |
114 | **/\r | |
115 | VOID\r | |
116 | Ip4CleanAssembleTable (\r | |
117 | IN IP4_ASSEMBLE_TABLE *Table\r | |
118 | )\r | |
119 | {\r | |
120 | LIST_ENTRY *Entry;\r | |
121 | LIST_ENTRY *Next;\r | |
122 | IP4_ASSEMBLE_ENTRY *Assemble;\r | |
123 | UINT32 Index;\r | |
124 | \r | |
125 | for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {\r | |
126 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &Table->Bucket[Index]) {\r | |
127 | Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);\r | |
128 | \r | |
129 | RemoveEntryList (Entry);\r | |
130 | Ip4FreeAssembleEntry (Assemble);\r | |
131 | }\r | |
132 | }\r | |
133 | }\r | |
134 | \r | |
135 | \r | |
136 | /**\r | |
137 | Trim the packet to fit in [Start, End), and update the per\r | |
138 | packet information.\r | |
139 | \r | |
140 | @param Packet Packet to trim\r | |
141 | @param Start The sequence of the first byte to fit in\r | |
142 | @param End One beyond the sequence of last byte to fit in.\r | |
143 | \r | |
144 | **/\r | |
145 | VOID\r | |
146 | Ip4TrimPacket (\r | |
147 | IN OUT NET_BUF *Packet,\r | |
148 | IN INTN Start,\r | |
149 | IN INTN End\r | |
150 | )\r | |
151 | {\r | |
152 | IP4_CLIP_INFO *Info;\r | |
153 | INTN Len;\r | |
154 | \r | |
155 | Info = IP4_GET_CLIP_INFO (Packet);\r | |
156 | \r | |
157 | ASSERT (Info->Start + Info->Length == Info->End);\r | |
158 | ASSERT ((Info->Start < End) && (Start < Info->End));\r | |
159 | \r | |
160 | if (Info->Start < Start) {\r | |
161 | Len = Start - Info->Start;\r | |
162 | \r | |
163 | NetbufTrim (Packet, (UINT32) Len, NET_BUF_HEAD);\r | |
164 | Info->Start = Start;\r | |
165 | Info->Length -= Len;\r | |
166 | }\r | |
167 | \r | |
168 | if (End < Info->End) {\r | |
169 | Len = End - Info->End;\r | |
170 | \r | |
171 | NetbufTrim (Packet, (UINT32) Len, NET_BUF_TAIL);\r | |
172 | Info->End = End;\r | |
173 | Info->Length -= Len;\r | |
174 | }\r | |
175 | }\r | |
176 | \r | |
177 | \r | |
178 | /**\r | |
179 | Release all the fragments of the packet. This is the callback for\r | |
180 | the assembled packet's OnFree. It will free the assemble entry,\r | |
181 | which in turn will free all the fragments of the packet.\r | |
182 | \r | |
183 | @param[in] Arg The assemble entry to free\r | |
184 | \r | |
185 | **/\r | |
186 | VOID\r | |
187 | EFIAPI\r | |
188 | Ip4OnFreeFragments (\r | |
189 | IN VOID *Arg\r | |
190 | )\r | |
191 | {\r | |
192 | Ip4FreeAssembleEntry ((IP4_ASSEMBLE_ENTRY *) Arg);\r | |
193 | }\r | |
194 | \r | |
195 | \r | |
196 | /**\r | |
197 | Reassemble the IP fragments. If all the fragments of the packet\r | |
198 | have been received, it will wrap the packet in a net buffer then\r | |
199 | return it to caller. If the packet can't be assembled, NULL is\r | |
200 | return.\r | |
201 | \r | |
202 | @param Table The assemble table used. New assemble entry will be created\r | |
203 | if the Packet is from a new chain of fragments.\r | |
204 | @param Packet The fragment to assemble. It might be freed if the fragment\r | |
205 | can't be re-assembled.\r | |
206 | \r | |
207 | @return NULL if the packet can't be reassemble. The point to just assembled\r | |
208 | packet if all the fragments of the packet have arrived.\r | |
209 | \r | |
210 | **/\r | |
211 | NET_BUF *\r | |
212 | Ip4Reassemble (\r | |
213 | IN OUT IP4_ASSEMBLE_TABLE *Table,\r | |
214 | IN OUT NET_BUF *Packet\r | |
215 | )\r | |
216 | {\r | |
217 | IP4_HEAD *IpHead;\r | |
218 | IP4_CLIP_INFO *This;\r | |
219 | IP4_CLIP_INFO *Node;\r | |
220 | IP4_ASSEMBLE_ENTRY *Assemble;\r | |
221 | LIST_ENTRY *Head;\r | |
222 | LIST_ENTRY *Prev;\r | |
223 | LIST_ENTRY *Cur;\r | |
224 | NET_BUF *Fragment;\r | |
225 | NET_BUF *NewPacket;\r | |
226 | INTN Index;\r | |
227 | \r | |
228 | IpHead = Packet->Ip.Ip4;\r | |
229 | This = IP4_GET_CLIP_INFO (Packet);\r | |
230 | \r | |
231 | ASSERT (IpHead != NULL);\r | |
232 | \r | |
233 | //\r | |
234 | // First: find the related assemble entry\r | |
235 | //\r | |
236 | Assemble = NULL;\r | |
237 | Index = IP4_ASSEMBLE_HASH (IpHead->Dst, IpHead->Src, IpHead->Id, IpHead->Protocol);\r | |
238 | \r | |
239 | NET_LIST_FOR_EACH (Cur, &Table->Bucket[Index]) {\r | |
240 | Assemble = NET_LIST_USER_STRUCT (Cur, IP4_ASSEMBLE_ENTRY, Link);\r | |
241 | \r | |
242 | if ((Assemble->Dst == IpHead->Dst) && (Assemble->Src == IpHead->Src) &&\r | |
243 | (Assemble->Id == IpHead->Id) && (Assemble->Protocol == IpHead->Protocol)) {\r | |
244 | break;\r | |
245 | }\r | |
246 | }\r | |
247 | \r | |
248 | //\r | |
249 | // Create a new assemble entry if no assemble entry is related to this packet\r | |
250 | //\r | |
251 | if (Cur == &Table->Bucket[Index]) {\r | |
252 | Assemble = Ip4CreateAssembleEntry (\r | |
253 | IpHead->Dst,\r | |
254 | IpHead->Src,\r | |
255 | IpHead->Id,\r | |
256 | IpHead->Protocol\r | |
257 | );\r | |
258 | \r | |
259 | if (Assemble == NULL) {\r | |
260 | goto DROP;\r | |
261 | }\r | |
262 | \r | |
263 | InsertHeadList (&Table->Bucket[Index], &Assemble->Link);\r | |
264 | }\r | |
265 | //\r | |
266 | // Assemble shouldn't be NULL here\r | |
267 | //\r | |
268 | ASSERT (Assemble != NULL);\r | |
269 | \r | |
270 | //\r | |
271 | // Find the point to insert the packet: before the first\r | |
272 | // fragment with THIS.Start < CUR.Start. the previous one\r | |
273 | // has PREV.Start <= THIS.Start < CUR.Start.\r | |
274 | //\r | |
275 | Head = &Assemble->Fragments;\r | |
276 | \r | |
277 | NET_LIST_FOR_EACH (Cur, Head) {\r | |
278 | Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
279 | \r | |
280 | if (This->Start < IP4_GET_CLIP_INFO (Fragment)->Start) {\r | |
281 | break;\r | |
282 | }\r | |
283 | }\r | |
284 | \r | |
285 | //\r | |
286 | // Check whether the current fragment overlaps with the previous one.\r | |
287 | // It holds that: PREV.Start <= THIS.Start < THIS.End. Only need to\r | |
288 | // check whether THIS.Start < PREV.End for overlap. If two fragments\r | |
289 | // overlaps, trim the overlapped part off THIS fragment.\r | |
290 | //\r | |
291 | if ((Prev = Cur->BackLink) != Head) {\r | |
292 | Fragment = NET_LIST_USER_STRUCT (Prev, NET_BUF, List);\r | |
293 | Node = IP4_GET_CLIP_INFO (Fragment);\r | |
294 | \r | |
295 | if (This->Start < Node->End) {\r | |
296 | if (This->End <= Node->End) {\r | |
297 | NetbufFree (Packet);\r | |
298 | return NULL;\r | |
299 | }\r | |
300 | \r | |
301 | Ip4TrimPacket (Packet, Node->End, This->End);\r | |
302 | }\r | |
303 | }\r | |
304 | \r | |
305 | //\r | |
306 | // Insert the fragment into the packet. The fragment may be removed\r | |
307 | // from the list by the following checks.\r | |
308 | //\r | |
309 | NetListInsertBefore (Cur, &Packet->List);\r | |
310 | \r | |
311 | //\r | |
312 | // Check the packets after the insert point. It holds that:\r | |
313 | // THIS.Start <= NODE.Start < NODE.End. The equality holds\r | |
314 | // if PREV and NEXT are continuous. THIS fragment may fill\r | |
315 | // several holes. Remove the completely overlapped fragments\r | |
316 | //\r | |
317 | while (Cur != Head) {\r | |
318 | Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
319 | Node = IP4_GET_CLIP_INFO (Fragment);\r | |
320 | \r | |
321 | //\r | |
322 | // Remove fragments completely overlapped by this fragment\r | |
323 | //\r | |
324 | if (Node->End <= This->End) {\r | |
325 | Cur = Cur->ForwardLink;\r | |
326 | \r | |
327 | RemoveEntryList (&Fragment->List);\r | |
328 | Assemble->CurLen -= Node->Length;\r | |
329 | \r | |
330 | NetbufFree (Fragment);\r | |
331 | continue;\r | |
332 | }\r | |
333 | \r | |
334 | //\r | |
335 | // The conditions are: THIS.Start <= NODE.Start, and THIS.End <\r | |
336 | // NODE.End. Two fragments overlaps if NODE.Start < THIS.End.\r | |
337 | // If two fragments start at the same offset, remove THIS fragment\r | |
338 | // because ((THIS.Start == NODE.Start) && (THIS.End < NODE.End)).\r | |
339 | //\r | |
340 | if (Node->Start < This->End) {\r | |
341 | if (This->Start == Node->Start) {\r | |
342 | RemoveEntryList (&Packet->List);\r | |
343 | goto DROP;\r | |
344 | }\r | |
345 | \r | |
346 | Ip4TrimPacket (Packet, This->Start, Node->Start);\r | |
347 | }\r | |
348 | \r | |
349 | break;\r | |
350 | }\r | |
351 | \r | |
352 | //\r | |
353 | // Update the assemble info: increase the current length. If it is\r | |
354 | // the frist fragment, update the packet's IP head and per packet\r | |
355 | // info. If it is the last fragment, update the total length.\r | |
356 | //\r | |
357 | Assemble->CurLen += This->Length;\r | |
358 | \r | |
359 | if (This->Start == 0) {\r | |
360 | //\r | |
361 | // Once the first fragment is enqueued, it can't be removed\r | |
362 | // from the fragment list. So, Assemble->Head always point\r | |
363 | // to valid memory area.\r | |
364 | //\r | |
365 | ASSERT (Assemble->Head == NULL);\r | |
366 | \r | |
367 | Assemble->Head = IpHead;\r | |
368 | Assemble->Info = IP4_GET_CLIP_INFO (Packet);\r | |
369 | }\r | |
370 | \r | |
371 | //\r | |
372 | // Don't update the length more than once.\r | |
373 | //\r | |
374 | if (IP4_LAST_FRAGMENT (IpHead->Fragment) && (Assemble->TotalLen == 0)) {\r | |
375 | Assemble->TotalLen = This->End;\r | |
376 | }\r | |
377 | \r | |
378 | //\r | |
379 | // Deliver the whole packet if all the fragments received.\r | |
380 | // All fragments received if:\r | |
381 | // 1. received the last one, so, the total length is know\r | |
382 | // 2. received all the data. If the last fragment on the\r | |
383 | // queue ends at the total length, all data is received.\r | |
384 | //\r | |
385 | if ((Assemble->TotalLen != 0) && (Assemble->CurLen >= Assemble->TotalLen)) {\r | |
386 | \r | |
387 | RemoveEntryList (&Assemble->Link);\r | |
388 | \r | |
389 | //\r | |
390 | // If the packet is properly formatted, the last fragment's End\r | |
391 | // equals to the packet's total length. Otherwise, the packet\r | |
392 | // is a fake, drop it now.\r | |
393 | //\r | |
394 | Fragment = NET_LIST_USER_STRUCT (Head->BackLink, NET_BUF, List);\r | |
395 | \r | |
396 | if (IP4_GET_CLIP_INFO (Fragment)->End != Assemble->TotalLen) {\r | |
397 | Ip4FreeAssembleEntry (Assemble);\r | |
398 | return NULL;\r | |
399 | }\r | |
400 | \r | |
401 | //\r | |
402 | // Wrap the packet in a net buffer then deliver it up\r | |
403 | //\r | |
404 | NewPacket = NetbufFromBufList (\r | |
405 | &Assemble->Fragments,\r | |
406 | 0,\r | |
407 | 0,\r | |
408 | Ip4OnFreeFragments,\r | |
409 | Assemble\r | |
410 | );\r | |
411 | \r | |
412 | if (NewPacket == NULL) {\r | |
413 | Ip4FreeAssembleEntry (Assemble);\r | |
414 | return NULL;\r | |
415 | }\r | |
416 | \r | |
417 | NewPacket->Ip.Ip4 = Assemble->Head;\r | |
418 | \r | |
419 | ASSERT (Assemble->Info != NULL);\r | |
420 | \r | |
421 | CopyMem (\r | |
422 | IP4_GET_CLIP_INFO (NewPacket),\r | |
423 | Assemble->Info,\r | |
424 | sizeof (*IP4_GET_CLIP_INFO (NewPacket))\r | |
425 | );\r | |
426 | \r | |
427 | return NewPacket;\r | |
428 | }\r | |
429 | \r | |
430 | return NULL;\r | |
431 | \r | |
432 | DROP:\r | |
433 | NetbufFree (Packet);\r | |
434 | return NULL;\r | |
435 | }\r | |
436 | \r | |
437 | /**\r | |
438 | The callback function for the net buffer which wraps the packet processed by\r | |
439 | IPsec. It releases the wrap packet and also signals IPsec to free the resources.\r | |
440 | \r | |
441 | @param[in] Arg The wrap context\r | |
442 | \r | |
443 | **/\r | |
444 | VOID\r | |
445 | EFIAPI\r | |
446 | Ip4IpSecFree (\r | |
447 | IN VOID *Arg\r | |
448 | )\r | |
449 | {\r | |
450 | IP4_IPSEC_WRAP *Wrap;\r | |
451 | \r | |
452 | Wrap = (IP4_IPSEC_WRAP *) Arg;\r | |
453 | \r | |
454 | if (Wrap->IpSecRecycleSignal != NULL) {\r | |
455 | gBS->SignalEvent (Wrap->IpSecRecycleSignal);\r | |
456 | }\r | |
457 | \r | |
458 | NetbufFree (Wrap->Packet);\r | |
459 | \r | |
460 | FreePool (Wrap);\r | |
461 | \r | |
462 | return;\r | |
463 | }\r | |
464 | \r | |
465 | /**\r | |
466 | The work function to locate IPsec protocol to process the inbound or\r | |
467 | outbound IP packets. The process routine handls the packet with following\r | |
468 | actions: bypass the packet, discard the packet, or protect the packet.\r | |
469 | \r | |
470 | @param[in] IpSb The IP4 service instance.\r | |
471 | @param[in, out] Head The caller supplied IP4 header.\r | |
472 | @param[in, out] Netbuf The IP4 packet to be processed by IPsec.\r | |
473 | @param[in, out] Options The caller supplied options.\r | |
474 | @param[in, out] OptionsLen The length of the option.\r | |
475 | @param[in] Direction The directionality in an SPD entry,\r | |
476 | EfiIPsecInBound or EfiIPsecOutBound.\r | |
477 | @param[in] Context The token's wrap.\r | |
478 | \r | |
479 | @retval EFI_SUCCESS The IPsec protocol is not available or disabled.\r | |
480 | @retval EFI_SUCCESS The packet was bypassed and all buffers remain the same.\r | |
481 | @retval EFI_SUCCESS The packet was protected.\r | |
482 | @retval EFI_ACCESS_DENIED The packet was discarded.\r | |
483 | @retval EFI_OUT_OF_RESOURCES There is no sufficient resource to complete the operation.\r | |
484 | @retval EFI_BUFFER_TOO_SMALL The number of non-empty block is bigger than the\r | |
485 | number of input data blocks when build a fragment table.\r | |
486 | \r | |
487 | **/\r | |
488 | EFI_STATUS\r | |
489 | Ip4IpSecProcessPacket (\r | |
490 | IN IP4_SERVICE *IpSb,\r | |
491 | IN OUT IP4_HEAD **Head,\r | |
492 | IN OUT NET_BUF **Netbuf,\r | |
493 | IN OUT UINT8 **Options,\r | |
494 | IN OUT UINT32 *OptionsLen,\r | |
495 | IN EFI_IPSEC_TRAFFIC_DIR Direction,\r | |
496 | IN VOID *Context\r | |
497 | )\r | |
498 | {\r | |
499 | NET_FRAGMENT *FragmentTable;\r | |
500 | NET_FRAGMENT *OriginalFragmentTable;\r | |
501 | UINT32 FragmentCount;\r | |
502 | UINT32 OriginalFragmentCount;\r | |
503 | EFI_EVENT RecycleEvent;\r | |
504 | NET_BUF *Packet;\r | |
505 | IP4_TXTOKEN_WRAP *TxWrap;\r | |
506 | IP4_IPSEC_WRAP *IpSecWrap;\r | |
507 | EFI_STATUS Status;\r | |
508 | IP4_HEAD ZeroHead;\r | |
509 | \r | |
510 | Status = EFI_SUCCESS;\r | |
511 | \r | |
512 | if (!mIpSec2Installed) {\r | |
513 | goto ON_EXIT;\r | |
514 | }\r | |
515 | ASSERT (mIpSec != NULL);\r | |
516 | \r | |
517 | Packet = *Netbuf;\r | |
518 | RecycleEvent = NULL;\r | |
519 | IpSecWrap = NULL;\r | |
520 | FragmentTable = NULL;\r | |
521 | TxWrap = (IP4_TXTOKEN_WRAP *) Context;\r | |
522 | FragmentCount = Packet->BlockOpNum;\r | |
523 | \r | |
524 | ZeroMem (&ZeroHead, sizeof (IP4_HEAD));\r | |
525 | \r | |
526 | //\r | |
527 | // Check whether the IPsec enable variable is set.\r | |
528 | //\r | |
529 | if (mIpSec->DisabledFlag) {\r | |
530 | //\r | |
531 | // If IPsec is disabled, restore the original MTU\r | |
532 | //\r | |
533 | IpSb->MaxPacketSize = IpSb->OldMaxPacketSize;\r | |
534 | goto ON_EXIT;\r | |
535 | } else {\r | |
536 | //\r | |
537 | // If IPsec is enabled, use the MTU which reduce the IPsec header length.\r | |
538 | //\r | |
539 | IpSb->MaxPacketSize = IpSb->OldMaxPacketSize - IP4_MAX_IPSEC_HEADLEN;\r | |
540 | }\r | |
541 | \r | |
542 | //\r | |
543 | // Rebuild fragment table from netbuf to ease IPsec process.\r | |
544 | //\r | |
545 | FragmentTable = AllocateZeroPool (FragmentCount * sizeof (NET_FRAGMENT));\r | |
546 | \r | |
547 | if (FragmentTable == NULL) {\r | |
548 | Status = EFI_OUT_OF_RESOURCES;\r | |
549 | goto ON_EXIT;\r | |
550 | }\r | |
551 | \r | |
552 | Status = NetbufBuildExt (Packet, FragmentTable, &FragmentCount);\r | |
553 | \r | |
554 | //\r | |
555 | // Record the original FragmentTable and count.\r | |
556 | //\r | |
557 | OriginalFragmentTable = FragmentTable;\r | |
558 | OriginalFragmentCount = FragmentCount;\r | |
559 | \r | |
560 | if (EFI_ERROR (Status)) {\r | |
561 | FreePool (FragmentTable);\r | |
562 | goto ON_EXIT;\r | |
563 | }\r | |
564 | \r | |
565 | //\r | |
566 | // Convert host byte order to network byte order\r | |
567 | //\r | |
568 | Ip4NtohHead (*Head);\r | |
569 | \r | |
570 | Status = mIpSec->ProcessExt (\r | |
571 | mIpSec,\r | |
572 | IpSb->Controller,\r | |
573 | IP_VERSION_4,\r | |
574 | (VOID *) (*Head),\r | |
575 | &(*Head)->Protocol,\r | |
576 | (VOID **) Options,\r | |
577 | OptionsLen,\r | |
578 | (EFI_IPSEC_FRAGMENT_DATA **) (&FragmentTable),\r | |
579 | &FragmentCount,\r | |
580 | Direction,\r | |
581 | &RecycleEvent\r | |
582 | );\r | |
583 | //\r | |
584 | // Convert back to host byte order\r | |
585 | //\r | |
586 | Ip4NtohHead (*Head);\r | |
587 | \r | |
588 | if (EFI_ERROR (Status)) {\r | |
589 | FreePool (OriginalFragmentTable);\r | |
590 | goto ON_EXIT;\r | |
591 | }\r | |
592 | \r | |
593 | if (OriginalFragmentTable == FragmentTable && OriginalFragmentCount == FragmentCount) {\r | |
594 | //\r | |
595 | // For ByPass Packet\r | |
596 | //\r | |
597 | FreePool (FragmentTable);\r | |
598 | goto ON_EXIT;\r | |
599 | } else {\r | |
600 | //\r | |
601 | // Free the FragmentTable which allocated before calling the IPsec.\r | |
602 | //\r | |
603 | FreePool (OriginalFragmentTable);\r | |
604 | }\r | |
605 | \r | |
606 | if (Direction == EfiIPsecOutBound && TxWrap != NULL) {\r | |
607 | \r | |
608 | TxWrap->IpSecRecycleSignal = RecycleEvent;\r | |
609 | TxWrap->Packet = NetbufFromExt (\r | |
610 | FragmentTable,\r | |
611 | FragmentCount,\r | |
612 | IP4_MAX_HEADLEN,\r | |
613 | 0,\r | |
614 | Ip4FreeTxToken,\r | |
615 | TxWrap\r | |
616 | );\r | |
617 | if (TxWrap->Packet == NULL) {\r | |
618 | //\r | |
619 | // Recover the TxWrap->Packet, if meet a error, and the caller will free\r | |
620 | // the TxWrap.\r | |
621 | //\r | |
622 | TxWrap->Packet = *Netbuf;\r | |
623 | Status = EFI_OUT_OF_RESOURCES;\r | |
624 | goto ON_EXIT;\r | |
625 | }\r | |
626 | \r | |
627 | //\r | |
628 | // Free original Netbuf.\r | |
629 | //\r | |
630 | NetIpSecNetbufFree (*Netbuf);\r | |
631 | *Netbuf = TxWrap->Packet;\r | |
632 | \r | |
633 | } else {\r | |
634 | \r | |
635 | IpSecWrap = AllocateZeroPool (sizeof (IP4_IPSEC_WRAP));\r | |
636 | \r | |
637 | if (IpSecWrap == NULL) {\r | |
638 | Status = EFI_OUT_OF_RESOURCES;\r | |
639 | gBS->SignalEvent (RecycleEvent);\r | |
640 | goto ON_EXIT;\r | |
641 | }\r | |
642 | \r | |
643 | IpSecWrap->IpSecRecycleSignal = RecycleEvent;\r | |
644 | IpSecWrap->Packet = Packet;\r | |
645 | Packet = NetbufFromExt (\r | |
646 | FragmentTable,\r | |
647 | FragmentCount,\r | |
648 | IP4_MAX_HEADLEN,\r | |
649 | 0,\r | |
650 | Ip4IpSecFree,\r | |
651 | IpSecWrap\r | |
652 | );\r | |
653 | \r | |
654 | if (Packet == NULL) {\r | |
655 | Packet = IpSecWrap->Packet;\r | |
656 | gBS->SignalEvent (RecycleEvent);\r | |
657 | FreePool (IpSecWrap);\r | |
658 | Status = EFI_OUT_OF_RESOURCES;\r | |
659 | goto ON_EXIT;\r | |
660 | }\r | |
661 | \r | |
662 | if (Direction == EfiIPsecInBound && 0 != CompareMem (*Head, &ZeroHead, sizeof (IP4_HEAD))) {\r | |
663 | Ip4PrependHead (Packet, *Head, *Options, *OptionsLen);\r | |
664 | Ip4NtohHead (Packet->Ip.Ip4);\r | |
665 | NetbufTrim (Packet, ((*Head)->HeadLen << 2), TRUE);\r | |
666 | \r | |
667 | CopyMem (\r | |
668 | IP4_GET_CLIP_INFO (Packet),\r | |
669 | IP4_GET_CLIP_INFO (IpSecWrap->Packet),\r | |
670 | sizeof (IP4_CLIP_INFO)\r | |
671 | );\r | |
672 | }\r | |
673 | *Netbuf = Packet;\r | |
674 | }\r | |
675 | \r | |
676 | ON_EXIT:\r | |
677 | return Status;\r | |
678 | }\r | |
679 | \r | |
680 | /**\r | |
681 | Pre-process the IPv4 packet. First validates the IPv4 packet, and\r | |
682 | then reassembles packet if it is necessary.\r | |
683 | \r | |
684 | @param[in] IpSb Pointer to IP4_SERVICE.\r | |
685 | @param[in, out] Packet Pointer to the Packet to be processed.\r | |
686 | @param[in] Head Pointer to the IP4_HEAD.\r | |
687 | @param[in] Option Pointer to a buffer which contains the IPv4 option.\r | |
688 | @param[in] OptionLen The length of Option in bytes.\r | |
689 | @param[in] Flag The link layer flag for the packet received, such\r | |
690 | as multicast.\r | |
691 | \r | |
692 | @retval EFI_SUCCESS The received packet is in well form.\r | |
693 | @retval EFI_INVALID_PARAMETER The received packet is malformed.\r | |
694 | \r | |
695 | **/\r | |
696 | EFI_STATUS\r | |
697 | Ip4PreProcessPacket (\r | |
698 | IN IP4_SERVICE *IpSb,\r | |
699 | IN OUT NET_BUF **Packet,\r | |
700 | IN IP4_HEAD *Head,\r | |
701 | IN UINT8 *Option,\r | |
702 | IN UINT32 OptionLen,\r | |
703 | IN UINT32 Flag\r | |
704 | )\r | |
705 | {\r | |
706 | IP4_CLIP_INFO *Info;\r | |
707 | UINT32 HeadLen;\r | |
708 | UINT32 TotalLen;\r | |
709 | UINT16 Checksum;\r | |
710 | \r | |
711 | //\r | |
712 | // Check if the IP4 header is correctly formatted.\r | |
713 | //\r | |
714 | HeadLen = (Head->HeadLen << 2);\r | |
715 | TotalLen = NTOHS (Head->TotalLen);\r | |
716 | \r | |
717 | //\r | |
718 | // Mnp may deliver frame trailer sequence up, trim it off.\r | |
719 | //\r | |
720 | if (TotalLen < (*Packet)->TotalSize) {\r | |
721 | NetbufTrim (*Packet, (*Packet)->TotalSize - TotalLen, FALSE);\r | |
722 | }\r | |
723 | \r | |
724 | if ((Head->Ver != 4) || (HeadLen < IP4_MIN_HEADLEN) ||\r | |
725 | (TotalLen < HeadLen) || (TotalLen != (*Packet)->TotalSize)) {\r | |
726 | return EFI_INVALID_PARAMETER;\r | |
727 | }\r | |
728 | \r | |
729 | //\r | |
730 | // Some OS may send IP packets without checksum.\r | |
731 | //\r | |
732 | Checksum = (UINT16) (~NetblockChecksum ((UINT8 *) Head, HeadLen));\r | |
733 | \r | |
734 | if ((Head->Checksum != 0) && (Checksum != 0)) {\r | |
735 | return EFI_INVALID_PARAMETER;\r | |
736 | }\r | |
737 | \r | |
738 | //\r | |
739 | // Convert the IP header to host byte order, then get the per packet info.\r | |
740 | //\r | |
741 | (*Packet)->Ip.Ip4 = Ip4NtohHead (Head);\r | |
742 | \r | |
743 | Info = IP4_GET_CLIP_INFO (*Packet);\r | |
744 | Info->LinkFlag = Flag;\r | |
745 | Info->CastType = Ip4GetHostCast (IpSb, Head->Dst, Head->Src);\r | |
746 | Info->Start = (Head->Fragment & IP4_HEAD_OFFSET_MASK) << 3;\r | |
747 | Info->Length = Head->TotalLen - HeadLen;\r | |
748 | Info->End = Info->Start + Info->Length;\r | |
749 | Info->Status = EFI_SUCCESS;\r | |
750 | \r | |
751 | //\r | |
752 | // The packet is destinated to us if the CastType is non-zero.\r | |
753 | //\r | |
754 | if ((Info->CastType == 0) || (Info->End > IP4_MAX_PACKET_SIZE)) {\r | |
755 | return EFI_INVALID_PARAMETER;\r | |
756 | }\r | |
757 | \r | |
758 | //\r | |
759 | // Validate the options. Don't call the Ip4OptionIsValid if\r | |
760 | // there is no option to save some CPU process.\r | |
761 | //\r | |
762 | \r | |
763 | if ((OptionLen > 0) && !Ip4OptionIsValid (Option, OptionLen, TRUE)) {\r | |
764 | return EFI_INVALID_PARAMETER;\r | |
765 | }\r | |
766 | \r | |
767 | //\r | |
768 | // Trim the head off, after this point, the packet is headless,\r | |
769 | // and Packet->TotalLen == Info->Length.\r | |
770 | //\r | |
771 | NetbufTrim (*Packet, HeadLen, TRUE);\r | |
772 | \r | |
773 | //\r | |
774 | // Reassemble the packet if this is a fragment. The packet is a\r | |
775 | // fragment if its head has MF (more fragment) set, or it starts\r | |
776 | // at non-zero byte.\r | |
777 | //\r | |
778 | if (((Head->Fragment & IP4_HEAD_MF_MASK) != 0) || (Info->Start != 0)) {\r | |
779 | //\r | |
780 | // Drop the fragment if DF is set but it is fragmented. Gateway\r | |
781 | // need to send a type 4 destination unreache ICMP message here.\r | |
782 | //\r | |
783 | if ((Head->Fragment & IP4_HEAD_DF_MASK) != 0) {\r | |
784 | return EFI_INVALID_PARAMETER;\r | |
785 | }\r | |
786 | \r | |
787 | //\r | |
788 | // The length of all but the last fragments is in the unit of 8 bytes.\r | |
789 | //\r | |
790 | if (((Head->Fragment & IP4_HEAD_MF_MASK) != 0) && (Info->Length % 8 != 0)) {\r | |
791 | return EFI_INVALID_PARAMETER;\r | |
792 | }\r | |
793 | \r | |
794 | *Packet = Ip4Reassemble (&IpSb->Assemble, *Packet);\r | |
795 | \r | |
796 | //\r | |
797 | // Packet assembly isn't complete, start receive more packet.\r | |
798 | //\r | |
799 | if (*Packet == NULL) {\r | |
800 | return EFI_INVALID_PARAMETER;\r | |
801 | }\r | |
802 | }\r | |
803 | \r | |
804 | return EFI_SUCCESS;\r | |
805 | }\r | |
806 | \r | |
807 | /**\r | |
808 | This function checks the IPv4 packet length.\r | |
809 | \r | |
810 | @param[in] Packet Pointer to the IPv4 Packet to be checked.\r | |
811 | \r | |
812 | @retval TRUE The input IPv4 packet length is valid.\r | |
813 | @retval FALSE The input IPv4 packet length is invalid.\r | |
814 | \r | |
815 | **/\r | |
816 | BOOLEAN\r | |
817 | Ip4IsValidPacketLength (\r | |
818 | IN NET_BUF *Packet\r | |
819 | )\r | |
820 | {\r | |
821 | //\r | |
822 | // Check the IP4 packet length.\r | |
823 | //\r | |
824 | if (Packet->TotalSize < IP4_MIN_HEADLEN) {\r | |
825 | return FALSE;\r | |
826 | }\r | |
827 | \r | |
828 | return TRUE;\r | |
829 | }\r | |
830 | \r | |
831 | /**\r | |
832 | The IP4 input routine. It is called by the IP4_INTERFACE when a\r | |
833 | IP4 fragment is received from MNP.\r | |
834 | \r | |
835 | @param[in] Ip4Instance The IP4 child that request the receive, most like\r | |
836 | it is NULL.\r | |
837 | @param[in] Packet The IP4 packet received.\r | |
838 | @param[in] IoStatus The return status of receive request.\r | |
839 | @param[in] Flag The link layer flag for the packet received, such\r | |
840 | as multicast.\r | |
841 | @param[in] Context The IP4 service instance that own the MNP.\r | |
842 | \r | |
843 | **/\r | |
844 | VOID\r | |
845 | Ip4AccpetFrame (\r | |
846 | IN IP4_PROTOCOL *Ip4Instance,\r | |
847 | IN NET_BUF *Packet,\r | |
848 | IN EFI_STATUS IoStatus,\r | |
849 | IN UINT32 Flag,\r | |
850 | IN VOID *Context\r | |
851 | )\r | |
852 | {\r | |
853 | IP4_SERVICE *IpSb;\r | |
854 | IP4_HEAD *Head;\r | |
855 | EFI_STATUS Status;\r | |
856 | IP4_HEAD ZeroHead;\r | |
857 | UINT8 *Option;\r | |
858 | UINT32 OptionLen;\r | |
859 | \r | |
860 | IpSb = (IP4_SERVICE *) Context;\r | |
861 | Option = NULL;\r | |
862 | \r | |
863 | if (EFI_ERROR (IoStatus) || (IpSb->State == IP4_SERVICE_DESTROY)) {\r | |
864 | goto DROP;\r | |
865 | }\r | |
866 | \r | |
867 | if (!Ip4IsValidPacketLength (Packet)) {\r | |
868 | goto RESTART;\r | |
869 | }\r | |
870 | \r | |
871 | Head = (IP4_HEAD *) NetbufGetByte (Packet, 0, NULL);\r | |
872 | ASSERT (Head != NULL);\r | |
873 | OptionLen = (Head->HeadLen << 2) - IP4_MIN_HEADLEN;\r | |
874 | if (OptionLen > 0) {\r | |
875 | Option = (UINT8 *) (Head + 1);\r | |
876 | }\r | |
877 | \r | |
878 | //\r | |
879 | // Validate packet format and reassemble packet if it is necessary.\r | |
880 | //\r | |
881 | Status = Ip4PreProcessPacket (\r | |
882 | IpSb,\r | |
883 | &Packet,\r | |
884 | Head,\r | |
885 | Option,\r | |
886 | OptionLen,\r | |
887 | Flag\r | |
888 | );\r | |
889 | \r | |
890 | if (EFI_ERROR (Status)) {\r | |
891 | goto RESTART;\r | |
892 | }\r | |
893 | \r | |
894 | //\r | |
895 | // After trim off, the packet is a esp/ah/udp/tcp/icmp6 net buffer,\r | |
896 | // and no need consider any other ahead ext headers.\r | |
897 | //\r | |
898 | Status = Ip4IpSecProcessPacket (\r | |
899 | IpSb,\r | |
900 | &Head,\r | |
901 | &Packet,\r | |
902 | &Option,\r | |
903 | &OptionLen,\r | |
904 | EfiIPsecInBound,\r | |
905 | NULL\r | |
906 | );\r | |
907 | \r | |
908 | if (EFI_ERROR (Status)) {\r | |
909 | goto RESTART;\r | |
910 | }\r | |
911 | \r | |
912 | //\r | |
913 | // If the packet is protected by tunnel mode, parse the inner Ip Packet.\r | |
914 | //\r | |
915 | ZeroMem (&ZeroHead, sizeof (IP4_HEAD));\r | |
916 | if (0 == CompareMem (Head, &ZeroHead, sizeof (IP4_HEAD))) {\r | |
917 | // Packet may have been changed. Head, HeadLen, TotalLen, and\r | |
918 | // info must be reloaded before use. The ownership of the packet\r | |
919 | // is transferred to the packet process logic.\r | |
920 | //\r | |
921 | if (!Ip4IsValidPacketLength (Packet)) {\r | |
922 | goto RESTART;\r | |
923 | }\r | |
924 | \r | |
925 | Head = (IP4_HEAD *) NetbufGetByte (Packet, 0, NULL);\r | |
926 | ASSERT (Head != NULL);\r | |
927 | Status = Ip4PreProcessPacket (\r | |
928 | IpSb,\r | |
929 | &Packet,\r | |
930 | Head,\r | |
931 | Option,\r | |
932 | OptionLen,\r | |
933 | Flag\r | |
934 | );\r | |
935 | if (EFI_ERROR (Status)) {\r | |
936 | goto RESTART;\r | |
937 | }\r | |
938 | }\r | |
939 | \r | |
940 | ASSERT (Packet != NULL);\r | |
941 | Head = Packet->Ip.Ip4;\r | |
942 | IP4_GET_CLIP_INFO (Packet)->Status = EFI_SUCCESS;\r | |
943 | \r | |
944 | switch (Head->Protocol) {\r | |
945 | case EFI_IP_PROTO_ICMP:\r | |
946 | Ip4IcmpHandle (IpSb, Head, Packet);\r | |
947 | break;\r | |
948 | \r | |
949 | case IP4_PROTO_IGMP:\r | |
950 | Ip4IgmpHandle (IpSb, Head, Packet);\r | |
951 | break;\r | |
952 | \r | |
953 | default:\r | |
954 | Ip4Demultiplex (IpSb, Head, Packet, Option, OptionLen);\r | |
955 | }\r | |
956 | \r | |
957 | Packet = NULL;\r | |
958 | \r | |
959 | //\r | |
960 | // Dispatch the DPCs queued by the NotifyFunction of the rx token's events\r | |
961 | // which are signaled with received data.\r | |
962 | //\r | |
963 | DispatchDpc ();\r | |
964 | \r | |
965 | RESTART:\r | |
966 | Ip4ReceiveFrame (IpSb->DefaultInterface, NULL, Ip4AccpetFrame, IpSb);\r | |
967 | \r | |
968 | DROP:\r | |
969 | if (Packet != NULL) {\r | |
970 | NetbufFree (Packet);\r | |
971 | }\r | |
972 | \r | |
973 | return ;\r | |
974 | }\r | |
975 | \r | |
976 | \r | |
977 | /**\r | |
978 | Check whether this IP child accepts the packet.\r | |
979 | \r | |
980 | @param[in] IpInstance The IP child to check\r | |
981 | @param[in] Head The IP header of the packet\r | |
982 | @param[in] Packet The data of the packet\r | |
983 | \r | |
984 | @retval TRUE If the child wants to receive the packet.\r | |
985 | @retval FALSE Otherwise.\r | |
986 | \r | |
987 | **/\r | |
988 | BOOLEAN\r | |
989 | Ip4InstanceFrameAcceptable (\r | |
990 | IN IP4_PROTOCOL *IpInstance,\r | |
991 | IN IP4_HEAD *Head,\r | |
992 | IN NET_BUF *Packet\r | |
993 | )\r | |
994 | {\r | |
995 | IP4_ICMP_ERROR_HEAD Icmp;\r | |
996 | EFI_IP4_CONFIG_DATA *Config;\r | |
997 | IP4_CLIP_INFO *Info;\r | |
998 | UINT16 Proto;\r | |
999 | UINT32 Index;\r | |
1000 | \r | |
1001 | Config = &IpInstance->ConfigData;\r | |
1002 | \r | |
1003 | //\r | |
1004 | // Dirty trick for the Tiano UEFI network stack implementation. If\r | |
1005 | // ReceiveTimeout == -1, the receive of the packet for this instance\r | |
1006 | // is disabled. The UEFI spec don't have such capability. We add\r | |
1007 | // this to improve the performance because IP will make a copy of\r | |
1008 | // the received packet for each accepting instance. Some IP instances\r | |
1009 | // used by UDP/TCP only send packets, they don't wants to receive.\r | |
1010 | //\r | |
1011 | if (Config->ReceiveTimeout == (UINT32)(-1)) {\r | |
1012 | return FALSE;\r | |
1013 | }\r | |
1014 | \r | |
1015 | if (Config->AcceptPromiscuous) {\r | |
1016 | return TRUE;\r | |
1017 | }\r | |
1018 | \r | |
1019 | //\r | |
1020 | // Use protocol from the IP header embedded in the ICMP error\r | |
1021 | // message to filter, instead of ICMP itself. ICMP handle will\r | |
1022 | // call Ip4Demultiplex to deliver ICMP errors.\r | |
1023 | //\r | |
1024 | Proto = Head->Protocol;\r | |
1025 | \r | |
1026 | if ((Proto == EFI_IP_PROTO_ICMP) && (!Config->AcceptAnyProtocol) && (Proto != Config->DefaultProtocol)) {\r | |
1027 | NetbufCopy (Packet, 0, sizeof (Icmp.Head), (UINT8 *) &Icmp.Head);\r | |
1028 | \r | |
1029 | if (mIcmpClass[Icmp.Head.Type].IcmpClass == ICMP_ERROR_MESSAGE) {\r | |
1030 | if (!Config->AcceptIcmpErrors) {\r | |
1031 | return FALSE;\r | |
1032 | }\r | |
1033 | \r | |
1034 | NetbufCopy (Packet, 0, sizeof (Icmp), (UINT8 *) &Icmp);\r | |
1035 | Proto = Icmp.IpHead.Protocol;\r | |
1036 | }\r | |
1037 | }\r | |
1038 | \r | |
1039 | //\r | |
1040 | // Match the protocol\r | |
1041 | //\r | |
1042 | if (!Config->AcceptAnyProtocol && (Proto != Config->DefaultProtocol)) {\r | |
1043 | return FALSE;\r | |
1044 | }\r | |
1045 | \r | |
1046 | //\r | |
1047 | // Check for broadcast, the caller has computed the packet's\r | |
1048 | // cast type for this child's interface.\r | |
1049 | //\r | |
1050 | Info = IP4_GET_CLIP_INFO (Packet);\r | |
1051 | \r | |
1052 | if (IP4_IS_BROADCAST (Info->CastType)) {\r | |
1053 | return Config->AcceptBroadcast;\r | |
1054 | }\r | |
1055 | \r | |
1056 | //\r | |
1057 | // If it is a multicast packet, check whether we are in the group.\r | |
1058 | //\r | |
1059 | if (Info->CastType == IP4_MULTICAST) {\r | |
1060 | //\r | |
1061 | // Receive the multicast if the instance wants to receive all packets.\r | |
1062 | //\r | |
1063 | if (!IpInstance->ConfigData.UseDefaultAddress && (IpInstance->Interface->Ip == 0)) {\r | |
1064 | return TRUE;\r | |
1065 | }\r | |
1066 | \r | |
1067 | for (Index = 0; Index < IpInstance->GroupCount; Index++) {\r | |
1068 | if (IpInstance->Groups[Index] == HTONL (Head->Dst)) {\r | |
1069 | break;\r | |
1070 | }\r | |
1071 | }\r | |
1072 | \r | |
1073 | return (BOOLEAN)(Index < IpInstance->GroupCount);\r | |
1074 | }\r | |
1075 | \r | |
1076 | return TRUE;\r | |
1077 | }\r | |
1078 | \r | |
1079 | \r | |
1080 | /**\r | |
1081 | Enqueue a shared copy of the packet to the IP4 child if the\r | |
1082 | packet is acceptable to it. Here the data of the packet is\r | |
1083 | shared, but the net buffer isn't.\r | |
1084 | \r | |
1085 | @param[in] IpInstance The IP4 child to enqueue the packet to\r | |
1086 | @param[in] Head The IP header of the received packet\r | |
1087 | @param[in] Packet The data of the received packet\r | |
1088 | \r | |
1089 | @retval EFI_NOT_STARTED The IP child hasn't been configured.\r | |
1090 | @retval EFI_INVALID_PARAMETER The child doesn't want to receive the packet\r | |
1091 | @retval EFI_OUT_OF_RESOURCES Failed to allocate some resource\r | |
1092 | @retval EFI_SUCCESS A shared copy the packet is enqueued to the child.\r | |
1093 | \r | |
1094 | **/\r | |
1095 | EFI_STATUS\r | |
1096 | Ip4InstanceEnquePacket (\r | |
1097 | IN IP4_PROTOCOL *IpInstance,\r | |
1098 | IN IP4_HEAD *Head,\r | |
1099 | IN NET_BUF *Packet\r | |
1100 | )\r | |
1101 | {\r | |
1102 | IP4_CLIP_INFO *Info;\r | |
1103 | NET_BUF *Clone;\r | |
1104 | \r | |
1105 | //\r | |
1106 | // Check whether the packet is acceptable to this instance.\r | |
1107 | //\r | |
1108 | if (IpInstance->State != IP4_STATE_CONFIGED) {\r | |
1109 | return EFI_NOT_STARTED;\r | |
1110 | }\r | |
1111 | \r | |
1112 | if (!Ip4InstanceFrameAcceptable (IpInstance, Head, Packet)) {\r | |
1113 | return EFI_INVALID_PARAMETER;\r | |
1114 | }\r | |
1115 | \r | |
1116 | //\r | |
1117 | // Enqueue a shared copy of the packet.\r | |
1118 | //\r | |
1119 | Clone = NetbufClone (Packet);\r | |
1120 | \r | |
1121 | if (Clone == NULL) {\r | |
1122 | return EFI_OUT_OF_RESOURCES;\r | |
1123 | }\r | |
1124 | \r | |
1125 | //\r | |
1126 | // Set the receive time out for the assembled packet. If it expires,\r | |
1127 | // packet will be removed from the queue.\r | |
1128 | //\r | |
1129 | Info = IP4_GET_CLIP_INFO (Clone);\r | |
1130 | Info->Life = IP4_US_TO_SEC (IpInstance->ConfigData.ReceiveTimeout);\r | |
1131 | \r | |
1132 | InsertTailList (&IpInstance->Received, &Clone->List);\r | |
1133 | return EFI_SUCCESS;\r | |
1134 | }\r | |
1135 | \r | |
1136 | \r | |
1137 | /**\r | |
1138 | The signal handle of IP4's recycle event. It is called back\r | |
1139 | when the upper layer release the packet.\r | |
1140 | \r | |
1141 | @param Event The IP4's recycle event.\r | |
1142 | @param Context The context of the handle, which is a\r | |
1143 | IP4_RXDATA_WRAP\r | |
1144 | \r | |
1145 | **/\r | |
1146 | VOID\r | |
1147 | EFIAPI\r | |
1148 | Ip4OnRecyclePacket (\r | |
1149 | IN EFI_EVENT Event,\r | |
1150 | IN VOID *Context\r | |
1151 | )\r | |
1152 | {\r | |
1153 | IP4_RXDATA_WRAP *Wrap;\r | |
1154 | \r | |
1155 | Wrap = (IP4_RXDATA_WRAP *) Context;\r | |
1156 | \r | |
1157 | EfiAcquireLockOrFail (&Wrap->IpInstance->RecycleLock);\r | |
1158 | RemoveEntryList (&Wrap->Link);\r | |
1159 | EfiReleaseLock (&Wrap->IpInstance->RecycleLock);\r | |
1160 | \r | |
1161 | ASSERT (!NET_BUF_SHARED (Wrap->Packet));\r | |
1162 | NetbufFree (Wrap->Packet);\r | |
1163 | \r | |
1164 | gBS->CloseEvent (Wrap->RxData.RecycleSignal);\r | |
1165 | FreePool (Wrap);\r | |
1166 | }\r | |
1167 | \r | |
1168 | \r | |
1169 | /**\r | |
1170 | Wrap the received packet to a IP4_RXDATA_WRAP, which will be\r | |
1171 | delivered to the upper layer. Each IP4 child that accepts the\r | |
1172 | packet will get a not-shared copy of the packet which is wrapped\r | |
1173 | in the IP4_RXDATA_WRAP. The IP4_RXDATA_WRAP->RxData is passed\r | |
1174 | to the upper layer. Upper layer will signal the recycle event in\r | |
1175 | it when it is done with the packet.\r | |
1176 | \r | |
1177 | @param[in] IpInstance The IP4 child to receive the packet.\r | |
1178 | @param[in] Packet The packet to deliver up.\r | |
1179 | \r | |
1180 | @retval Wrap if warp the packet succeed.\r | |
1181 | @retval NULL failed to wrap the packet .\r | |
1182 | \r | |
1183 | **/\r | |
1184 | IP4_RXDATA_WRAP *\r | |
1185 | Ip4WrapRxData (\r | |
1186 | IN IP4_PROTOCOL *IpInstance,\r | |
1187 | IN NET_BUF *Packet\r | |
1188 | )\r | |
1189 | {\r | |
1190 | IP4_RXDATA_WRAP *Wrap;\r | |
1191 | EFI_IP4_RECEIVE_DATA *RxData;\r | |
1192 | EFI_STATUS Status;\r | |
1193 | BOOLEAN RawData;\r | |
1194 | \r | |
1195 | Wrap = AllocatePool (IP4_RXDATA_WRAP_SIZE (Packet->BlockOpNum));\r | |
1196 | \r | |
1197 | if (Wrap == NULL) {\r | |
1198 | return NULL;\r | |
1199 | }\r | |
1200 | \r | |
1201 | InitializeListHead (&Wrap->Link);\r | |
1202 | \r | |
1203 | Wrap->IpInstance = IpInstance;\r | |
1204 | Wrap->Packet = Packet;\r | |
1205 | RxData = &Wrap->RxData;\r | |
1206 | \r | |
1207 | ZeroMem (RxData, sizeof (EFI_IP4_RECEIVE_DATA));\r | |
1208 | \r | |
1209 | Status = gBS->CreateEvent (\r | |
1210 | EVT_NOTIFY_SIGNAL,\r | |
1211 | TPL_NOTIFY,\r | |
1212 | Ip4OnRecyclePacket,\r | |
1213 | Wrap,\r | |
1214 | &RxData->RecycleSignal\r | |
1215 | );\r | |
1216 | \r | |
1217 | if (EFI_ERROR (Status)) {\r | |
1218 | FreePool (Wrap);\r | |
1219 | return NULL;\r | |
1220 | }\r | |
1221 | \r | |
1222 | ASSERT (Packet->Ip.Ip4 != NULL);\r | |
1223 | \r | |
1224 | ASSERT (IpInstance != NULL);\r | |
1225 | RawData = IpInstance->ConfigData.RawData;\r | |
1226 | \r | |
1227 | //\r | |
1228 | // The application expects a network byte order header.\r | |
1229 | //\r | |
1230 | if (!RawData) {\r | |
1231 | RxData->HeaderLength = (Packet->Ip.Ip4->HeadLen << 2);\r | |
1232 | RxData->Header = (EFI_IP4_HEADER *) Ip4NtohHead (Packet->Ip.Ip4);\r | |
1233 | RxData->OptionsLength = RxData->HeaderLength - IP4_MIN_HEADLEN;\r | |
1234 | RxData->Options = NULL;\r | |
1235 | \r | |
1236 | if (RxData->OptionsLength != 0) {\r | |
1237 | RxData->Options = (VOID *) (RxData->Header + 1);\r | |
1238 | }\r | |
1239 | }\r | |
1240 | \r | |
1241 | RxData->DataLength = Packet->TotalSize;\r | |
1242 | \r | |
1243 | //\r | |
1244 | // Build the fragment table to be delivered up.\r | |
1245 | //\r | |
1246 | RxData->FragmentCount = Packet->BlockOpNum;\r | |
1247 | NetbufBuildExt (Packet, (NET_FRAGMENT *) RxData->FragmentTable, &RxData->FragmentCount);\r | |
1248 | \r | |
1249 | return Wrap;\r | |
1250 | }\r | |
1251 | \r | |
1252 | \r | |
1253 | /**\r | |
1254 | Deliver the received packets to upper layer if there are both received\r | |
1255 | requests and enqueued packets. If the enqueued packet is shared, it will\r | |
1256 | duplicate it to a non-shared packet, release the shared packet, then\r | |
1257 | deliver the non-shared packet up.\r | |
1258 | \r | |
1259 | @param[in] IpInstance The IP child to deliver the packet up.\r | |
1260 | \r | |
1261 | @retval EFI_OUT_OF_RESOURCES Failed to allocate resources to deliver the\r | |
1262 | packets.\r | |
1263 | @retval EFI_SUCCESS All the enqueued packets that can be delivered\r | |
1264 | are delivered up.\r | |
1265 | \r | |
1266 | **/\r | |
1267 | EFI_STATUS\r | |
1268 | Ip4InstanceDeliverPacket (\r | |
1269 | IN IP4_PROTOCOL *IpInstance\r | |
1270 | )\r | |
1271 | {\r | |
1272 | EFI_IP4_COMPLETION_TOKEN *Token;\r | |
1273 | IP4_RXDATA_WRAP *Wrap;\r | |
1274 | NET_BUF *Packet;\r | |
1275 | NET_BUF *Dup;\r | |
1276 | UINT8 *Head;\r | |
1277 | UINT32 HeadLen;\r | |
1278 | \r | |
1279 | //\r | |
1280 | // Deliver a packet if there are both a packet and a receive token.\r | |
1281 | //\r | |
1282 | while (!IsListEmpty (&IpInstance->Received) &&\r | |
1283 | !NetMapIsEmpty (&IpInstance->RxTokens)) {\r | |
1284 | \r | |
1285 | Packet = NET_LIST_HEAD (&IpInstance->Received, NET_BUF, List);\r | |
1286 | \r | |
1287 | if (!NET_BUF_SHARED (Packet)) {\r | |
1288 | //\r | |
1289 | // If this is the only instance that wants the packet, wrap it up.\r | |
1290 | //\r | |
1291 | Wrap = Ip4WrapRxData (IpInstance, Packet);\r | |
1292 | \r | |
1293 | if (Wrap == NULL) {\r | |
1294 | return EFI_OUT_OF_RESOURCES;\r | |
1295 | }\r | |
1296 | \r | |
1297 | RemoveEntryList (&Packet->List);\r | |
1298 | \r | |
1299 | } else {\r | |
1300 | //\r | |
1301 | // Create a duplicated packet if this packet is shared\r | |
1302 | //\r | |
1303 | if (IpInstance->ConfigData.RawData) {\r | |
1304 | HeadLen = 0;\r | |
1305 | } else {\r | |
1306 | HeadLen = IP4_MAX_HEADLEN;\r | |
1307 | }\r | |
1308 | \r | |
1309 | Dup = NetbufDuplicate (Packet, NULL, HeadLen);\r | |
1310 | \r | |
1311 | if (Dup == NULL) {\r | |
1312 | return EFI_OUT_OF_RESOURCES;\r | |
1313 | }\r | |
1314 | \r | |
1315 | if (!IpInstance->ConfigData.RawData) {\r | |
1316 | //\r | |
1317 | // Copy the IP head over. The packet to deliver up is\r | |
1318 | // headless. Trim the head off after copy. The IP head\r | |
1319 | // may be not continuous before the data.\r | |
1320 | //\r | |
1321 | Head = NetbufAllocSpace (Dup, IP4_MAX_HEADLEN, NET_BUF_HEAD);\r | |
1322 | ASSERT (Head != NULL);\r | |
1323 | \r | |
1324 | Dup->Ip.Ip4 = (IP4_HEAD *) Head;\r | |
1325 | \r | |
1326 | CopyMem (Head, Packet->Ip.Ip4, Packet->Ip.Ip4->HeadLen << 2);\r | |
1327 | NetbufTrim (Dup, IP4_MAX_HEADLEN, TRUE);\r | |
1328 | }\r | |
1329 | \r | |
1330 | Wrap = Ip4WrapRxData (IpInstance, Dup);\r | |
1331 | \r | |
1332 | if (Wrap == NULL) {\r | |
1333 | NetbufFree (Dup);\r | |
1334 | return EFI_OUT_OF_RESOURCES;\r | |
1335 | }\r | |
1336 | \r | |
1337 | RemoveEntryList (&Packet->List);\r | |
1338 | NetbufFree (Packet);\r | |
1339 | \r | |
1340 | Packet = Dup;\r | |
1341 | }\r | |
1342 | \r | |
1343 | //\r | |
1344 | // Insert it into the delivered packet, then get a user's\r | |
1345 | // receive token, pass the wrapped packet up.\r | |
1346 | //\r | |
1347 | EfiAcquireLockOrFail (&IpInstance->RecycleLock);\r | |
1348 | InsertHeadList (&IpInstance->Delivered, &Wrap->Link);\r | |
1349 | EfiReleaseLock (&IpInstance->RecycleLock);\r | |
1350 | \r | |
1351 | Token = NetMapRemoveHead (&IpInstance->RxTokens, NULL);\r | |
1352 | Token->Status = IP4_GET_CLIP_INFO (Packet)->Status;\r | |
1353 | Token->Packet.RxData = &Wrap->RxData;\r | |
1354 | \r | |
1355 | gBS->SignalEvent (Token->Event);\r | |
1356 | }\r | |
1357 | \r | |
1358 | return EFI_SUCCESS;\r | |
1359 | }\r | |
1360 | \r | |
1361 | \r | |
1362 | /**\r | |
1363 | Enqueue a received packet to all the IP children that share\r | |
1364 | the same interface.\r | |
1365 | \r | |
1366 | @param[in] IpSb The IP4 service instance that receive the packet.\r | |
1367 | @param[in] Head The header of the received packet.\r | |
1368 | @param[in] Packet The data of the received packet.\r | |
1369 | @param[in] Option Point to the IP4 packet header options.\r | |
1370 | @param[in] OptionLen Length of the IP4 packet header options.\r | |
1371 | @param[in] IpIf The interface to enqueue the packet to.\r | |
1372 | \r | |
1373 | @return The number of the IP4 children that accepts the packet\r | |
1374 | \r | |
1375 | **/\r | |
1376 | INTN\r | |
1377 | Ip4InterfaceEnquePacket (\r | |
1378 | IN IP4_SERVICE *IpSb,\r | |
1379 | IN IP4_HEAD *Head,\r | |
1380 | IN NET_BUF *Packet,\r | |
1381 | IN UINT8 *Option,\r | |
1382 | IN UINT32 OptionLen,\r | |
1383 | IN IP4_INTERFACE *IpIf\r | |
1384 | )\r | |
1385 | {\r | |
1386 | IP4_PROTOCOL *IpInstance;\r | |
1387 | IP4_CLIP_INFO *Info;\r | |
1388 | LIST_ENTRY *Entry;\r | |
1389 | INTN Enqueued;\r | |
1390 | INTN LocalType;\r | |
1391 | INTN SavedType;\r | |
1392 | \r | |
1393 | //\r | |
1394 | // First, check that the packet is acceptable to this interface\r | |
1395 | // and find the local cast type for the interface. A packet sent\r | |
1396 | // to say 192.168.1.1 should NOT be deliver to 10.0.0.1 unless\r | |
1397 | // promiscuous receiving.\r | |
1398 | //\r | |
1399 | LocalType = 0;\r | |
1400 | Info = IP4_GET_CLIP_INFO (Packet);\r | |
1401 | \r | |
1402 | if ((Info->CastType == IP4_MULTICAST) || (Info->CastType == IP4_LOCAL_BROADCAST)) {\r | |
1403 | //\r | |
1404 | // If the CastType is multicast, don't need to filter against\r | |
1405 | // the group address here, Ip4InstanceFrameAcceptable will do\r | |
1406 | // that later.\r | |
1407 | //\r | |
1408 | LocalType = Info->CastType;\r | |
1409 | \r | |
1410 | } else {\r | |
1411 | //\r | |
1412 | // Check the destination against local IP. If the station\r | |
1413 | // address is 0.0.0.0, it means receiving all the IP destined\r | |
1414 | // to local non-zero IP. Otherwise, it is necessary to compare\r | |
1415 | // the destination to the interface's IP address.\r | |
1416 | //\r | |
1417 | if (IpIf->Ip == IP4_ALLZERO_ADDRESS) {\r | |
1418 | LocalType = IP4_LOCAL_HOST;\r | |
1419 | \r | |
1420 | } else {\r | |
1421 | LocalType = Ip4GetNetCast (Head->Dst, IpIf);\r | |
1422 | \r | |
1423 | if ((LocalType == 0) && IpIf->PromiscRecv) {\r | |
1424 | LocalType = IP4_PROMISCUOUS;\r | |
1425 | }\r | |
1426 | }\r | |
1427 | }\r | |
1428 | \r | |
1429 | if (LocalType == 0) {\r | |
1430 | return 0;\r | |
1431 | }\r | |
1432 | \r | |
1433 | //\r | |
1434 | // Iterate through the ip instances on the interface, enqueue\r | |
1435 | // the packet if filter passed. Save the original cast type,\r | |
1436 | // and pass the local cast type to the IP children on the\r | |
1437 | // interface. The global cast type will be restored later.\r | |
1438 | //\r | |
1439 | SavedType = Info->CastType;\r | |
1440 | Info->CastType = LocalType;\r | |
1441 | \r | |
1442 | Enqueued = 0;\r | |
1443 | \r | |
1444 | NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {\r | |
1445 | IpInstance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);\r | |
1446 | NET_CHECK_SIGNATURE (IpInstance, IP4_PROTOCOL_SIGNATURE);\r | |
1447 | \r | |
1448 | //\r | |
1449 | // In RawData mode, add IPv4 headers and options back to packet.\r | |
1450 | //\r | |
1451 | if ((IpInstance->ConfigData.RawData) && (Option != NULL) && (OptionLen != 0)){\r | |
1452 | Ip4PrependHead (Packet, Head, Option, OptionLen);\r | |
1453 | }\r | |
1454 | \r | |
1455 | if (Ip4InstanceEnquePacket (IpInstance, Head, Packet) == EFI_SUCCESS) {\r | |
1456 | Enqueued++;\r | |
1457 | }\r | |
1458 | }\r | |
1459 | \r | |
1460 | Info->CastType = SavedType;\r | |
1461 | return Enqueued;\r | |
1462 | }\r | |
1463 | \r | |
1464 | \r | |
1465 | /**\r | |
1466 | Deliver the packet for each IP4 child on the interface.\r | |
1467 | \r | |
1468 | @param[in] IpSb The IP4 service instance that received the packet\r | |
1469 | @param[in] IpIf The IP4 interface to deliver the packet.\r | |
1470 | \r | |
1471 | @retval EFI_SUCCESS It always returns EFI_SUCCESS now\r | |
1472 | \r | |
1473 | **/\r | |
1474 | EFI_STATUS\r | |
1475 | Ip4InterfaceDeliverPacket (\r | |
1476 | IN IP4_SERVICE *IpSb,\r | |
1477 | IN IP4_INTERFACE *IpIf\r | |
1478 | )\r | |
1479 | {\r | |
1480 | IP4_PROTOCOL *Ip4Instance;\r | |
1481 | LIST_ENTRY *Entry;\r | |
1482 | \r | |
1483 | NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {\r | |
1484 | Ip4Instance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);\r | |
1485 | Ip4InstanceDeliverPacket (Ip4Instance);\r | |
1486 | }\r | |
1487 | \r | |
1488 | return EFI_SUCCESS;\r | |
1489 | }\r | |
1490 | \r | |
1491 | \r | |
1492 | /**\r | |
1493 | Demultiple the packet. the packet delivery is processed in two\r | |
1494 | passes. The first pass will enqueue a shared copy of the packet\r | |
1495 | to each IP4 child that accepts the packet. The second pass will\r | |
1496 | deliver a non-shared copy of the packet to each IP4 child that\r | |
1497 | has pending receive requests. Data is copied if more than one\r | |
1498 | child wants to consume the packet because each IP child needs\r | |
1499 | its own copy of the packet to make changes.\r | |
1500 | \r | |
1501 | @param[in] IpSb The IP4 service instance that received the packet.\r | |
1502 | @param[in] Head The header of the received packet.\r | |
1503 | @param[in] Packet The data of the received packet.\r | |
1504 | @param[in] Option Point to the IP4 packet header options.\r | |
1505 | @param[in] OptionLen Length of the IP4 packet header options.\r | |
1506 | \r | |
1507 | @retval EFI_NOT_FOUND No IP child accepts the packet.\r | |
1508 | @retval EFI_SUCCESS The packet is enqueued or delivered to some IP\r | |
1509 | children.\r | |
1510 | \r | |
1511 | **/\r | |
1512 | EFI_STATUS\r | |
1513 | Ip4Demultiplex (\r | |
1514 | IN IP4_SERVICE *IpSb,\r | |
1515 | IN IP4_HEAD *Head,\r | |
1516 | IN NET_BUF *Packet,\r | |
1517 | IN UINT8 *Option,\r | |
1518 | IN UINT32 OptionLen\r | |
1519 | )\r | |
1520 | {\r | |
1521 | LIST_ENTRY *Entry;\r | |
1522 | IP4_INTERFACE *IpIf;\r | |
1523 | INTN Enqueued;\r | |
1524 | \r | |
1525 | //\r | |
1526 | // Two pass delivery: first, enqueue a shared copy of the packet\r | |
1527 | // to each instance that accept the packet.\r | |
1528 | //\r | |
1529 | Enqueued = 0;\r | |
1530 | \r | |
1531 | NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {\r | |
1532 | IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);\r | |
1533 | \r | |
1534 | if (IpIf->Configured) {\r | |
1535 | Enqueued += Ip4InterfaceEnquePacket (\r | |
1536 | IpSb,\r | |
1537 | Head,\r | |
1538 | Packet,\r | |
1539 | Option,\r | |
1540 | OptionLen,\r | |
1541 | IpIf\r | |
1542 | );\r | |
1543 | }\r | |
1544 | }\r | |
1545 | \r | |
1546 | //\r | |
1547 | // Second: deliver a duplicate of the packet to each instance.\r | |
1548 | // Release the local reference first, so that the last instance\r | |
1549 | // getting the packet will not copy the data.\r | |
1550 | //\r | |
1551 | NetbufFree (Packet);\r | |
1552 | \r | |
1553 | if (Enqueued == 0) {\r | |
1554 | return EFI_NOT_FOUND;\r | |
1555 | }\r | |
1556 | \r | |
1557 | NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {\r | |
1558 | IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);\r | |
1559 | \r | |
1560 | if (IpIf->Configured) {\r | |
1561 | Ip4InterfaceDeliverPacket (IpSb, IpIf);\r | |
1562 | }\r | |
1563 | }\r | |
1564 | \r | |
1565 | return EFI_SUCCESS;\r | |
1566 | }\r | |
1567 | \r | |
1568 | \r | |
1569 | /**\r | |
1570 | Timeout the fragment and enqueued packets.\r | |
1571 | \r | |
1572 | @param[in] IpSb The IP4 service instance to timeout\r | |
1573 | \r | |
1574 | **/\r | |
1575 | VOID\r | |
1576 | Ip4PacketTimerTicking (\r | |
1577 | IN IP4_SERVICE *IpSb\r | |
1578 | )\r | |
1579 | {\r | |
1580 | LIST_ENTRY *InstanceEntry;\r | |
1581 | LIST_ENTRY *Entry;\r | |
1582 | LIST_ENTRY *Next;\r | |
1583 | IP4_PROTOCOL *IpInstance;\r | |
1584 | IP4_ASSEMBLE_ENTRY *Assemble;\r | |
1585 | NET_BUF *Packet;\r | |
1586 | IP4_CLIP_INFO *Info;\r | |
1587 | UINT32 Index;\r | |
1588 | \r | |
1589 | //\r | |
1590 | // First, time out the fragments. The packet's life is counting down\r | |
1591 | // once the first-arrived fragment was received.\r | |
1592 | //\r | |
1593 | for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {\r | |
1594 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpSb->Assemble.Bucket[Index]) {\r | |
1595 | Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);\r | |
1596 | \r | |
1597 | if ((Assemble->Life > 0) && (--Assemble->Life == 0)) {\r | |
1598 | RemoveEntryList (Entry);\r | |
1599 | Ip4FreeAssembleEntry (Assemble);\r | |
1600 | }\r | |
1601 | }\r | |
1602 | }\r | |
1603 | \r | |
1604 | NET_LIST_FOR_EACH (InstanceEntry, &IpSb->Children) {\r | |
1605 | IpInstance = NET_LIST_USER_STRUCT (InstanceEntry, IP4_PROTOCOL, Link);\r | |
1606 | \r | |
1607 | //\r | |
1608 | // Second, time out the assembled packets enqueued on each IP child.\r | |
1609 | //\r | |
1610 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpInstance->Received) {\r | |
1611 | Packet = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1612 | Info = IP4_GET_CLIP_INFO (Packet);\r | |
1613 | \r | |
1614 | if ((Info->Life > 0) && (--Info->Life == 0)) {\r | |
1615 | RemoveEntryList (Entry);\r | |
1616 | NetbufFree (Packet);\r | |
1617 | }\r | |
1618 | }\r | |
1619 | \r | |
1620 | //\r | |
1621 | // Third: time out the transmitted packets.\r | |
1622 | //\r | |
1623 | NetMapIterate (&IpInstance->TxTokens, Ip4SentPacketTicking, NULL);\r | |
1624 | }\r | |
1625 | }\r |