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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 | Ip4Input.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | IP4 input process.\r | |
19 | \r | |
20 | \r | |
21 | **/\r | |
22 | \r | |
23 | #include "Ip4Impl.h"\r | |
24 | \r | |
25 | \r | |
26 | /**\r | |
27 | Create a empty assemble entry for the packet identified by\r | |
28 | (Dst, Src, Id, Protocol). The default life for the packet is\r | |
29 | 120 seconds.\r | |
30 | \r | |
31 | @param Dst The destination address\r | |
32 | @param Src The source address\r | |
33 | @param Id The ID field in IP header\r | |
34 | @param Protocol The protocol field in IP header\r | |
35 | \r | |
36 | @return NULL if failed to allocate memory for the entry, otherwise\r | |
37 | @return the point to just created reassemble entry.\r | |
38 | \r | |
39 | **/\r | |
40 | STATIC\r | |
41 | IP4_ASSEMBLE_ENTRY *\r | |
42 | Ip4CreateAssembleEntry (\r | |
43 | IN IP4_ADDR Dst,\r | |
44 | IN IP4_ADDR Src,\r | |
45 | IN UINT16 Id,\r | |
46 | IN UINT8 Protocol\r | |
47 | )\r | |
48 | {\r | |
49 | \r | |
50 | IP4_ASSEMBLE_ENTRY *Assemble;\r | |
51 | \r | |
52 | Assemble = NetAllocatePool (sizeof (IP4_ASSEMBLE_ENTRY));\r | |
53 | \r | |
54 | if (Assemble == NULL) {\r | |
55 | return NULL;\r | |
56 | }\r | |
57 | \r | |
58 | NetListInit (&Assemble->Link);\r | |
59 | NetListInit (&Assemble->Fragments);\r | |
60 | \r | |
61 | Assemble->Dst = Dst;\r | |
62 | Assemble->Src = Src;\r | |
63 | Assemble->Id = Id;\r | |
64 | Assemble->Protocol = Protocol;\r | |
65 | Assemble->TotalLen = 0;\r | |
66 | Assemble->CurLen = 0;\r | |
67 | Assemble->Head = NULL;\r | |
68 | Assemble->Info = NULL;\r | |
69 | Assemble->Life = IP4_FRAGMENT_LIFE;\r | |
70 | \r | |
71 | return Assemble;\r | |
72 | }\r | |
73 | \r | |
74 | \r | |
75 | /**\r | |
76 | Release all the fragments of a packet, then free the assemble entry\r | |
77 | \r | |
78 | @param Assemble The assemble entry to free\r | |
79 | \r | |
80 | @return None\r | |
81 | \r | |
82 | **/\r | |
83 | STATIC\r | |
84 | VOID\r | |
85 | Ip4FreeAssembleEntry (\r | |
86 | IN IP4_ASSEMBLE_ENTRY *Assemble\r | |
87 | )\r | |
88 | {\r | |
89 | NET_LIST_ENTRY *Entry;\r | |
90 | NET_LIST_ENTRY *Next;\r | |
91 | NET_BUF *Fragment;\r | |
92 | \r | |
93 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &Assemble->Fragments) {\r | |
94 | Fragment = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
95 | \r | |
96 | NetListRemoveEntry (Entry);\r | |
97 | NetbufFree (Fragment);\r | |
98 | }\r | |
99 | \r | |
100 | NetFreePool (Assemble);\r | |
101 | }\r | |
102 | \r | |
103 | \r | |
104 | /**\r | |
105 | Initialize an already allocated assemble table. This is generally\r | |
106 | the assemble table embedded in the IP4 service instance.\r | |
107 | \r | |
108 | @param Table The assemble table to initialize.\r | |
109 | \r | |
110 | @return NONE\r | |
111 | \r | |
112 | **/\r | |
113 | VOID\r | |
114 | Ip4InitAssembleTable (\r | |
115 | IN IP4_ASSEMBLE_TABLE *Table\r | |
116 | )\r | |
117 | {\r | |
118 | UINT32 Index;\r | |
119 | \r | |
120 | for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {\r | |
121 | NetListInit (&Table->Bucket[Index]);\r | |
122 | }\r | |
123 | }\r | |
124 | \r | |
125 | \r | |
126 | /**\r | |
127 | Clean up the assemble table: remove all the fragments\r | |
128 | and assemble entries.\r | |
129 | \r | |
130 | @param Table The assemble table to clean up\r | |
131 | \r | |
132 | @return None\r | |
133 | \r | |
134 | **/\r | |
135 | VOID\r | |
136 | Ip4CleanAssembleTable (\r | |
137 | IN IP4_ASSEMBLE_TABLE *Table\r | |
138 | )\r | |
139 | {\r | |
140 | NET_LIST_ENTRY *Entry;\r | |
141 | NET_LIST_ENTRY *Next;\r | |
142 | IP4_ASSEMBLE_ENTRY *Assemble;\r | |
143 | UINT32 Index;\r | |
144 | \r | |
145 | for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {\r | |
146 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &Table->Bucket[Index]) {\r | |
147 | Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);\r | |
148 | \r | |
149 | NetListRemoveEntry (Entry);\r | |
150 | Ip4FreeAssembleEntry (Assemble);\r | |
151 | }\r | |
152 | }\r | |
153 | }\r | |
154 | \r | |
155 | \r | |
156 | /**\r | |
157 | Trim the packet to fit in [Start, End), and update the per\r | |
158 | packet information.\r | |
159 | \r | |
160 | @param Packet Packet to trim\r | |
161 | @param Start The sequence of the first byte to fit in\r | |
162 | @param End One beyond the sequence of last byte to fit in.\r | |
163 | \r | |
164 | @return None\r | |
165 | \r | |
166 | **/\r | |
167 | STATIC\r | |
168 | VOID\r | |
169 | Ip4TrimPacket (\r | |
170 | IN NET_BUF *Packet,\r | |
171 | IN INTN Start,\r | |
172 | IN INTN End\r | |
173 | )\r | |
174 | {\r | |
175 | IP4_CLIP_INFO *Info;\r | |
176 | INTN Len;\r | |
177 | \r | |
178 | Info = IP4_GET_CLIP_INFO (Packet);\r | |
179 | \r | |
180 | ASSERT (Info->Start + Info->Length == Info->End);\r | |
181 | ASSERT ((Info->Start < End) && (Start < Info->End));\r | |
182 | \r | |
183 | if (Info->Start < Start) {\r | |
184 | Len = Start - Info->Start;\r | |
185 | \r | |
186 | NetbufTrim (Packet, (UINT32) Len, NET_BUF_HEAD);\r | |
187 | Info->Start = Start;\r | |
188 | Info->Length -= Len;\r | |
189 | }\r | |
190 | \r | |
191 | if (End < Info->End) {\r | |
192 | Len = End - Info->End;\r | |
193 | \r | |
194 | NetbufTrim (Packet, (UINT32) Len, NET_BUF_TAIL);\r | |
195 | Info->End = End;\r | |
196 | Info->Length -= Len;\r | |
197 | }\r | |
198 | }\r | |
199 | \r | |
200 | \r | |
201 | /**\r | |
202 | Release all the fragments of the packet. This is the callback for\r | |
203 | the assembled packet's OnFree. It will free the assemble entry,\r | |
204 | which in turn will free all the fragments of the packet.\r | |
205 | \r | |
206 | @param Arg The assemble entry to free\r | |
207 | \r | |
208 | @return None\r | |
209 | \r | |
210 | **/\r | |
211 | STATIC\r | |
212 | VOID\r | |
213 | Ip4OnFreeFragments (\r | |
214 | IN VOID *Arg\r | |
215 | )\r | |
216 | {\r | |
217 | Ip4FreeAssembleEntry ((IP4_ASSEMBLE_ENTRY *) Arg);\r | |
218 | }\r | |
219 | \r | |
220 | \r | |
221 | /**\r | |
222 | Reassemble the IP fragments. If all the fragments of the packet\r | |
223 | have been received, it will wrap the packet in a net buffer then\r | |
224 | return it to caller. If the packet can't be assembled, NULL is\r | |
225 | return.\r | |
226 | \r | |
227 | @param Table The assemble table used.\r | |
228 | @param Packet The fragment to assemble\r | |
229 | \r | |
230 | @return NULL if the packet can't be reassemble. The point to just assembled\r | |
231 | @return packet if all the fragments of the packet have arrived.\r | |
232 | \r | |
233 | **/\r | |
234 | STATIC\r | |
235 | NET_BUF *\r | |
236 | Ip4Reassemble (\r | |
237 | IN IP4_ASSEMBLE_TABLE *Table,\r | |
238 | IN NET_BUF *Packet\r | |
239 | )\r | |
240 | {\r | |
241 | IP4_HEAD *IpHead;\r | |
242 | IP4_CLIP_INFO *This;\r | |
243 | IP4_CLIP_INFO *Node;\r | |
244 | IP4_ASSEMBLE_ENTRY *Assemble;\r | |
245 | NET_LIST_ENTRY *Head;\r | |
246 | NET_LIST_ENTRY *Prev;\r | |
247 | NET_LIST_ENTRY *Cur;\r | |
248 | NET_BUF *Fragment;\r | |
249 | NET_BUF *NewPacket;\r | |
250 | INTN Index;\r | |
251 | \r | |
252 | IpHead = Packet->Ip;\r | |
253 | This = IP4_GET_CLIP_INFO (Packet);\r | |
254 | \r | |
255 | ASSERT (IpHead != NULL);\r | |
256 | \r | |
257 | //\r | |
258 | // First: find the related assemble entry\r | |
259 | //\r | |
260 | Assemble = NULL;\r | |
261 | Index = IP4_ASSEMBLE_HASH (IpHead->Dst, IpHead->Src, IpHead->Id, IpHead->Protocol);\r | |
262 | \r | |
263 | NET_LIST_FOR_EACH (Cur, &Table->Bucket[Index]) {\r | |
264 | Assemble = NET_LIST_USER_STRUCT (Cur, IP4_ASSEMBLE_ENTRY, Link);\r | |
265 | \r | |
266 | if ((Assemble->Dst == IpHead->Dst) && (Assemble->Src == IpHead->Src) &&\r | |
267 | (Assemble->Id == IpHead->Id) && (Assemble->Protocol == IpHead->Protocol)) {\r | |
268 | break;\r | |
269 | }\r | |
270 | }\r | |
271 | \r | |
272 | //\r | |
273 | // Create a new assemble entry if no assemble entry is related to this packet\r | |
274 | //\r | |
275 | if (Cur == &Table->Bucket[Index]) {\r | |
276 | Assemble = Ip4CreateAssembleEntry (\r | |
277 | IpHead->Dst,\r | |
278 | IpHead->Src,\r | |
279 | IpHead->Id,\r | |
280 | IpHead->Protocol\r | |
281 | );\r | |
282 | \r | |
283 | if (Assemble == NULL) {\r | |
284 | goto DROP;\r | |
285 | }\r | |
286 | \r | |
287 | NetListInsertHead (&Table->Bucket[Index], &Assemble->Link);\r | |
288 | }\r | |
289 | \r | |
290 | //\r | |
291 | // Find the point to insert the packet: before the first\r | |
292 | // fragment with THIS.Start < CUR.Start. the previous one\r | |
293 | // has PREV.Start <= THIS.Start < CUR.Start.\r | |
294 | //\r | |
295 | Head = &Assemble->Fragments;\r | |
296 | \r | |
297 | NET_LIST_FOR_EACH (Cur, Head) {\r | |
298 | Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
299 | \r | |
300 | if (This->Start < IP4_GET_CLIP_INFO (Fragment)->Start) {\r | |
301 | break;\r | |
302 | }\r | |
303 | }\r | |
304 | \r | |
305 | //\r | |
306 | // Check whether the current fragment overlaps with the previous one.\r | |
307 | // It holds that: PREV.Start <= THIS.Start < THIS.End. Only need to\r | |
308 | // check whether THIS.Start < PREV.End for overlap. If two fragments\r | |
309 | // overlaps, trim the overlapped part off THIS fragment.\r | |
310 | //\r | |
311 | if ((Prev = Cur->ForwardLink) != Head) {\r | |
312 | Fragment = NET_LIST_USER_STRUCT (Prev, NET_BUF, List);\r | |
313 | Node = IP4_GET_CLIP_INFO (Fragment);\r | |
314 | \r | |
315 | if (This->Start < Node->End) {\r | |
316 | if (This->End <= Node->End) {\r | |
317 | NetbufFree (Packet);\r | |
318 | return NULL;\r | |
319 | }\r | |
320 | \r | |
321 | Ip4TrimPacket (Packet, Node->End, This->End);\r | |
322 | }\r | |
323 | }\r | |
324 | \r | |
325 | //\r | |
326 | // Insert the fragment into the packet. The fragment may be removed\r | |
327 | // from the list by the following checks.\r | |
328 | //\r | |
329 | NetListInsertBefore (Cur, &Packet->List);\r | |
330 | \r | |
331 | //\r | |
332 | // Check the packets after the insert point. It holds that:\r | |
333 | // THIS.Start <= NODE.Start < NODE.End. The equality holds\r | |
334 | // if PREV and NEXT are continuous. THIS fragment may fill\r | |
335 | // several holes. Remove the completely overlapped fragments\r | |
336 | //\r | |
337 | while (Cur != Head) {\r | |
338 | Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
339 | Node = IP4_GET_CLIP_INFO (Fragment);\r | |
340 | \r | |
341 | //\r | |
342 | // Remove fragments completely overlapped by this fragment\r | |
343 | //\r | |
344 | if (Node->End <= This->End) {\r | |
345 | Cur = Cur->ForwardLink;\r | |
346 | \r | |
347 | NetListRemoveEntry (&Fragment->List);\r | |
348 | Assemble->CurLen -= Node->Length;\r | |
349 | \r | |
350 | NetbufFree (Fragment);\r | |
351 | continue;\r | |
352 | }\r | |
353 | \r | |
354 | //\r | |
355 | // The conditions are: THIS.Start <= NODE.Start, and THIS.End <\r | |
356 | // NODE.End. Two fragments overlaps if NODE.Start < THIS.End.\r | |
357 | // If two fragments start at the same offset, remove THIS fragment\r | |
358 | // because ((THIS.Start == NODE.Start) && (THIS.End < NODE.End)).\r | |
359 | //\r | |
360 | if (Node->Start < This->End) {\r | |
361 | if (This->Start == Node->Start) {\r | |
362 | NetListRemoveEntry (&Packet->List);\r | |
363 | goto DROP;\r | |
364 | }\r | |
365 | \r | |
366 | Ip4TrimPacket (Packet, This->Start, Node->Start);\r | |
367 | }\r | |
368 | \r | |
369 | break;\r | |
370 | }\r | |
371 | \r | |
372 | //\r | |
373 | // Update the assemble info: increase the current length. If it is\r | |
374 | // the frist fragment, update the packet's IP head and per packet\r | |
375 | // info. If it is the last fragment, update the total length.\r | |
376 | //\r | |
377 | Assemble->CurLen += This->Length;\r | |
378 | \r | |
379 | if (This->Start == 0) {\r | |
380 | //\r | |
381 | // Once the first fragment is enqueued, it can't be removed\r | |
382 | // from the fragment list. So, Assemble->Head always point\r | |
383 | // to valid memory area.\r | |
384 | //\r | |
385 | ASSERT (Assemble->Head == NULL);\r | |
386 | \r | |
387 | Assemble->Head = IpHead;\r | |
388 | Assemble->Info = IP4_GET_CLIP_INFO (Packet);\r | |
389 | }\r | |
390 | \r | |
391 | //\r | |
392 | // Don't update the length more than once.\r | |
393 | //\r | |
394 | if (IP4_LAST_FRAGMENT (IpHead->Fragment) && (Assemble->TotalLen == 0)) {\r | |
395 | Assemble->TotalLen = This->End;\r | |
396 | }\r | |
397 | \r | |
398 | //\r | |
399 | // Deliver the whole packet if all the fragments received.\r | |
400 | // All fragments received if:\r | |
401 | // 1. received the last one, so, the totoal length is know\r | |
402 | // 2. received all the data. If the last fragment on the\r | |
403 | // queue ends at the total length, all data is received.\r | |
404 | //\r | |
405 | if ((Assemble->TotalLen != 0) && (Assemble->CurLen >= Assemble->TotalLen)) {\r | |
406 | \r | |
407 | NetListRemoveEntry (&Assemble->Link);\r | |
408 | \r | |
409 | //\r | |
410 | // If the packet is properly formated, the last fragment's End\r | |
411 | // equals to the packet's total length. Otherwise, the packet\r | |
412 | // is a fake, drop it now.\r | |
413 | //\r | |
414 | Fragment = NET_LIST_USER_STRUCT (Head->BackLink, NET_BUF, List);\r | |
415 | \r | |
416 | if (IP4_GET_CLIP_INFO (Fragment)->End != Assemble->TotalLen) {\r | |
417 | Ip4FreeAssembleEntry (Assemble);\r | |
418 | return NULL;\r | |
419 | }\r | |
420 | \r | |
421 | //\r | |
422 | // Wrap the packet in a net buffer then deliver it up\r | |
423 | //\r | |
424 | NewPacket = NetbufFromBufList (\r | |
425 | &Assemble->Fragments,\r | |
426 | 0,\r | |
427 | 0,\r | |
428 | Ip4OnFreeFragments,\r | |
429 | Assemble\r | |
430 | );\r | |
431 | \r | |
432 | if (NewPacket == NULL) {\r | |
433 | Ip4FreeAssembleEntry (Assemble);\r | |
434 | return NULL;\r | |
435 | }\r | |
436 | \r | |
437 | NewPacket->Ip = Assemble->Head;\r | |
438 | CopyMem (IP4_GET_CLIP_INFO (NewPacket), Assemble->Info, sizeof (*IP4_GET_CLIP_INFO (NewPacket)));\r | |
439 | return NewPacket;\r | |
440 | }\r | |
441 | \r | |
442 | return NULL;\r | |
443 | \r | |
444 | DROP:\r | |
445 | NetbufFree (Packet);\r | |
446 | return NULL;\r | |
447 | }\r | |
448 | \r | |
449 | \r | |
450 | /**\r | |
451 | The IP4 input routine. It is called by the IP4_INTERFACE when a\r | |
452 | IP4 fragment is received from MNP.\r | |
453 | \r | |
454 | @param Ip4Instance The IP4 child that request the receive, most like\r | |
455 | it is NULL.\r | |
456 | @param Packet The IP4 packet received.\r | |
457 | @param IoStatus The return status of receive request.\r | |
458 | @param Flag The link layer flag for the packet received, such\r | |
459 | as multicast.\r | |
460 | @param Context The IP4 service instance that own the MNP.\r | |
461 | \r | |
462 | @return None\r | |
463 | \r | |
464 | **/\r | |
465 | VOID\r | |
466 | Ip4AccpetFrame (\r | |
467 | IN IP4_PROTOCOL *Ip4Instance,\r | |
468 | IN NET_BUF *Packet,\r | |
469 | IN EFI_STATUS IoStatus,\r | |
470 | IN UINT32 Flag,\r | |
471 | IN VOID *Context\r | |
472 | )\r | |
473 | {\r | |
474 | IP4_SERVICE *IpSb;\r | |
475 | IP4_CLIP_INFO *Info;\r | |
476 | IP4_HEAD *Head;\r | |
477 | UINT32 HeadLen;\r | |
478 | UINT32 OptionLen;\r | |
479 | UINT32 TotalLen;\r | |
480 | UINT16 Checksum;\r | |
481 | \r | |
482 | IpSb = (IP4_SERVICE *) Context;\r | |
483 | \r | |
484 | if (EFI_ERROR (IoStatus) || (IpSb->State == IP4_SERVICE_DESTORY)) {\r | |
485 | goto DROP;\r | |
486 | }\r | |
487 | \r | |
488 | //\r | |
489 | // Check that the IP4 header is correctly formated\r | |
490 | //\r | |
491 | if (Packet->TotalSize < IP4_MIN_HEADLEN) {\r | |
492 | goto RESTART;\r | |
493 | }\r | |
494 | \r | |
495 | Head = (IP4_HEAD *) NetbufGetByte (Packet, 0, NULL);\r | |
496 | HeadLen = (Head->HeadLen << 2);\r | |
497 | TotalLen = NTOHS (Head->TotalLen);\r | |
498 | \r | |
499 | //\r | |
500 | // Mnp may deliver frame trailer sequence up, trim it off.\r | |
501 | //\r | |
502 | if (TotalLen < Packet->TotalSize) {\r | |
503 | NetbufTrim (Packet, Packet->TotalSize - TotalLen, FALSE);\r | |
504 | }\r | |
505 | \r | |
506 | if ((Head->Ver != 4) || (HeadLen < IP4_MIN_HEADLEN) ||\r | |
507 | (TotalLen < HeadLen) || (TotalLen != Packet->TotalSize)) {\r | |
508 | goto RESTART;\r | |
509 | }\r | |
510 | \r | |
511 | //\r | |
512 | // Some OS may send IP packets without checksum.\r | |
513 | //\r | |
514 | Checksum = (UINT16) (~NetblockChecksum ((UINT8 *) Head, HeadLen));\r | |
515 | \r | |
516 | if ((Head->Checksum != 0) && (Checksum != 0)) {\r | |
517 | goto RESTART;\r | |
518 | }\r | |
519 | \r | |
520 | //\r | |
521 | // Convert the IP header to host byte order, then get the per packet info.\r | |
522 | //\r | |
523 | Packet->Ip = Ip4NtohHead (Head);\r | |
524 | \r | |
525 | Info = IP4_GET_CLIP_INFO (Packet);\r | |
526 | Info->LinkFlag = Flag;\r | |
527 | Info->CastType = Ip4GetHostCast (IpSb, Head->Dst, Head->Src);\r | |
528 | Info->Start = (Head->Fragment & IP4_HEAD_OFFSET_MASK) << 3;\r | |
529 | Info->Length = Head->TotalLen - HeadLen;\r | |
530 | Info->End = Info->Start + Info->Length;\r | |
531 | Info->Status = EFI_SUCCESS;\r | |
532 | \r | |
533 | //\r | |
534 | // The packet is destinated to us if the CastType is non-zero.\r | |
535 | //\r | |
536 | if ((Info->CastType == 0) || (Info->End > IP4_MAX_PACKET_SIZE)) {\r | |
537 | goto RESTART;\r | |
538 | }\r | |
539 | \r | |
540 | //\r | |
541 | // Validate the options. Don't call the Ip4OptionIsValid if\r | |
542 | // there is no option to save some CPU process.\r | |
543 | //\r | |
544 | OptionLen = HeadLen - IP4_MIN_HEADLEN;\r | |
545 | \r | |
546 | if ((OptionLen > 0) && !Ip4OptionIsValid ((UINT8 *) (Head + 1), OptionLen, TRUE)) {\r | |
547 | goto RESTART;\r | |
548 | }\r | |
549 | \r | |
550 | //\r | |
551 | // Trim the head off, after this point, the packet is headless.\r | |
552 | // and Packet->TotalLen == Info->Length.\r | |
553 | //\r | |
554 | NetbufTrim (Packet, HeadLen, TRUE);\r | |
555 | \r | |
556 | //\r | |
557 | // Reassemble the packet if this is a fragment. The packet is a\r | |
558 | // fragment if its head has MF (more fragment) set, or it starts\r | |
559 | // at non-zero byte.\r | |
560 | //\r | |
561 | if ((Head->Fragment & IP4_HEAD_MF_MASK) || (Info->Start != 0)) {\r | |
562 | //\r | |
563 | // Drop the fragment if DF is set but it is fragmented. Gateway\r | |
564 | // need to send a type 4 destination unreache ICMP message here.\r | |
565 | //\r | |
566 | if (Head->Fragment & IP4_HEAD_DF_MASK) {\r | |
567 | goto RESTART;\r | |
568 | }\r | |
569 | \r | |
570 | //\r | |
571 | // The length of all but the last fragments is in the unit of 8 bytes.\r | |
572 | //\r | |
573 | if ((Head->Fragment & IP4_HEAD_MF_MASK) && (Info->Length % 8 != 0)) {\r | |
574 | goto RESTART;\r | |
575 | }\r | |
576 | \r | |
577 | Packet = Ip4Reassemble (&IpSb->Assemble, Packet);\r | |
578 | \r | |
579 | //\r | |
580 | // Packet assembly isn't complete, start receive more packet.\r | |
581 | //\r | |
582 | if (Packet == NULL) {\r | |
583 | goto RESTART;\r | |
584 | }\r | |
585 | }\r | |
586 | \r | |
587 | //\r | |
588 | // Packet may have been changed. Head, HeadLen, TotalLen, and\r | |
589 | // info must be reloaded bofore use. The ownership of the packet\r | |
590 | // is transfered to the packet process logic.\r | |
591 | //\r | |
592 | Head = Packet->Ip;\r | |
593 | IP4_GET_CLIP_INFO (Packet)->Status = EFI_SUCCESS;\r | |
594 | \r | |
595 | switch (Head->Protocol) {\r | |
596 | case IP4_PROTO_ICMP:\r | |
597 | Ip4IcmpHandle (IpSb, Head, Packet);\r | |
598 | break;\r | |
599 | \r | |
600 | case IP4_PROTO_IGMP:\r | |
601 | Ip4IgmpHandle (IpSb, Head, Packet);\r | |
602 | break;\r | |
603 | \r | |
604 | default:\r | |
605 | Ip4Demultiplex (IpSb, Head, Packet);\r | |
606 | }\r | |
607 | \r | |
608 | Packet = NULL;\r | |
609 | \r | |
610 | RESTART:\r | |
611 | Ip4ReceiveFrame (IpSb->DefaultInterface, NULL, Ip4AccpetFrame, IpSb);\r | |
612 | \r | |
613 | DROP:\r | |
614 | if (Packet != NULL) {\r | |
615 | NetbufFree (Packet);\r | |
616 | }\r | |
617 | \r | |
618 | return ;\r | |
619 | }\r | |
620 | \r | |
621 | \r | |
622 | /**\r | |
623 | Check whether this IP child accepts the packet.\r | |
624 | \r | |
625 | @param IpInstance The IP child to check\r | |
626 | @param Head The IP header of the packet\r | |
627 | @param Packet The data of the packet\r | |
628 | \r | |
629 | @return TRUE if the child wants to receive the packet, otherwise return FALSE.\r | |
630 | \r | |
631 | **/\r | |
632 | BOOLEAN\r | |
633 | Ip4InstanceFrameAcceptable (\r | |
634 | IN IP4_PROTOCOL *IpInstance,\r | |
635 | IN IP4_HEAD *Head,\r | |
636 | IN NET_BUF *Packet\r | |
637 | )\r | |
638 | {\r | |
639 | IP4_ICMP_ERROR_HEAD Icmp;\r | |
640 | EFI_IP4_CONFIG_DATA *Config;\r | |
641 | IP4_CLIP_INFO *Info;\r | |
642 | UINT16 Proto;\r | |
643 | UINT32 Index;\r | |
644 | \r | |
645 | Config = &IpInstance->ConfigData;\r | |
646 | \r | |
647 | //\r | |
648 | // Dirty trick for the Tiano UEFI network stack implmentation. If\r | |
649 | // ReceiveTimeout == -1, the receive of the packet for this instance\r | |
650 | // is disabled. The UEFI spec don't have such captibility. We add\r | |
651 | // this to improve the performance because IP will make a copy of\r | |
652 | // the received packet for each accepting instance. Some IP instances\r | |
653 | // used by UDP/TCP only send packets, they don't wants to receive.\r | |
654 | //\r | |
655 | if (Config->ReceiveTimeout == (UINT32)(-1)) {\r | |
656 | return FALSE;\r | |
657 | }\r | |
658 | \r | |
659 | if (Config->AcceptPromiscuous) {\r | |
660 | return TRUE;\r | |
661 | }\r | |
662 | \r | |
663 | //\r | |
664 | // Use protocol from the IP header embedded in the ICMP error\r | |
665 | // message to filter, instead of ICMP itself. ICMP handle will\r | |
666 | // can Ip4Demultiplex to deliver ICMP errors.\r | |
667 | //\r | |
668 | Proto = Head->Protocol;\r | |
669 | \r | |
670 | if (Proto == IP4_PROTO_ICMP) {\r | |
671 | NetbufCopy (Packet, 0, sizeof (Icmp.Head), (UINT8 *) &Icmp.Head);\r | |
672 | \r | |
673 | if (mIcmpClass[Icmp.Head.Type].IcmpClass == ICMP_ERROR_MESSAGE) {\r | |
674 | if (!Config->AcceptIcmpErrors) {\r | |
675 | return FALSE;\r | |
676 | }\r | |
677 | \r | |
678 | NetbufCopy (Packet, 0, sizeof (Icmp), (UINT8 *) &Icmp);\r | |
679 | Proto = Icmp.IpHead.Protocol;\r | |
680 | }\r | |
681 | }\r | |
682 | \r | |
683 | //\r | |
684 | // Match the protocol\r | |
685 | //\r | |
686 | if (!Config->AcceptAnyProtocol && (Proto != Config->DefaultProtocol)) {\r | |
687 | return FALSE;\r | |
688 | }\r | |
689 | \r | |
690 | //\r | |
691 | // Check for broadcast, the caller has computed the packet's\r | |
692 | // cast type for this child's interface.\r | |
693 | //\r | |
694 | Info = IP4_GET_CLIP_INFO (Packet);\r | |
695 | \r | |
696 | if (IP4_IS_BROADCAST (Info->CastType)) {\r | |
697 | return Config->AcceptBroadcast;\r | |
698 | }\r | |
699 | \r | |
700 | //\r | |
701 | // If it is a multicast packet, check whether we are in the group.\r | |
702 | //\r | |
703 | if (Info->CastType == IP4_MULTICAST) {\r | |
704 | //\r | |
705 | // Receive the multicast if the instance wants to receive all packets.\r | |
706 | //\r | |
707 | if (!IpInstance->ConfigData.UseDefaultAddress && (IpInstance->Interface->Ip == 0)) {\r | |
708 | return TRUE;\r | |
709 | }\r | |
710 | \r | |
711 | for (Index = 0; Index < IpInstance->GroupCount; Index++) {\r | |
712 | if (IpInstance->Groups[Index] == HTONL (Head->Dst)) {\r | |
713 | break;\r | |
714 | }\r | |
715 | }\r | |
716 | \r | |
717 | return (BOOLEAN)(Index < IpInstance->GroupCount);\r | |
718 | }\r | |
719 | \r | |
720 | return TRUE;\r | |
721 | }\r | |
722 | \r | |
723 | \r | |
724 | /**\r | |
725 | Enqueue a shared copy of the packet to the IP4 child if the\r | |
726 | packet is acceptable to it. Here the data of the packet is\r | |
727 | shared, but the net buffer isn't.\r | |
728 | \r | |
729 | @param IpInstance The IP4 child to enqueue the packet to\r | |
730 | @param Head The IP header of the received packet\r | |
731 | @param Packet The data of the received packet\r | |
732 | \r | |
733 | @retval EFI_NOT_STARTED The IP child hasn't been configured.\r | |
734 | @retval EFI_INVALID_PARAMETER The child doesn't want to receive the packet\r | |
735 | @retval EFI_OUT_OF_RESOURCES Failed to allocate some resource\r | |
736 | @retval EFI_SUCCESS A shared copy the packet is enqueued to the child.\r | |
737 | \r | |
738 | **/\r | |
739 | EFI_STATUS\r | |
740 | Ip4InstanceEnquePacket (\r | |
741 | IN IP4_PROTOCOL *IpInstance,\r | |
742 | IN IP4_HEAD *Head,\r | |
743 | IN NET_BUF *Packet\r | |
744 | )\r | |
745 | {\r | |
746 | IP4_CLIP_INFO *Info;\r | |
747 | NET_BUF *Clone;\r | |
748 | \r | |
749 | //\r | |
750 | // Check whether the packet is acceptable to this instance.\r | |
751 | //\r | |
752 | if (IpInstance->State != IP4_STATE_CONFIGED) {\r | |
753 | return EFI_NOT_STARTED;\r | |
754 | }\r | |
755 | \r | |
756 | if (!Ip4InstanceFrameAcceptable (IpInstance, Head, Packet)) {\r | |
757 | return EFI_INVALID_PARAMETER;\r | |
758 | }\r | |
759 | \r | |
760 | //\r | |
761 | // Enque a shared copy of the packet.\r | |
762 | //\r | |
763 | Clone = NetbufClone (Packet);\r | |
764 | \r | |
765 | if (Clone == NULL) {\r | |
766 | return EFI_OUT_OF_RESOURCES;\r | |
767 | }\r | |
768 | \r | |
769 | //\r | |
770 | // Set the receive time out for the assembled packet. If it expires,\r | |
771 | // packet will be removed from the queue.\r | |
772 | //\r | |
773 | Info = IP4_GET_CLIP_INFO (Clone);\r | |
774 | Info->Life = IP4_US_TO_SEC (IpInstance->ConfigData.ReceiveTimeout);\r | |
775 | \r | |
776 | NetListInsertTail (&IpInstance->Received, &Clone->List);\r | |
777 | return EFI_SUCCESS;\r | |
778 | }\r | |
779 | \r | |
780 | \r | |
781 | /**\r | |
782 | The signal handle of IP4's recycle event. It is called back\r | |
783 | when the upper layer release the packet.\r | |
784 | \r | |
785 | @param Event The IP4's recycle event.\r | |
786 | @param Context The context of the handle, which is a\r | |
787 | IP4_RXDATA_WRAP\r | |
788 | \r | |
789 | @return None\r | |
790 | \r | |
791 | **/\r | |
792 | STATIC\r | |
793 | VOID\r | |
794 | EFIAPI\r | |
795 | Ip4OnRecyclePacket (\r | |
796 | IN EFI_EVENT Event,\r | |
797 | IN VOID *Context\r | |
798 | )\r | |
799 | {\r | |
800 | IP4_RXDATA_WRAP *Wrap;\r | |
801 | \r | |
802 | Wrap = (IP4_RXDATA_WRAP *) Context;\r | |
803 | \r | |
804 | NET_TRYLOCK (&Wrap->IpInstance->RecycleLock);\r | |
805 | NetListRemoveEntry (&Wrap->Link);\r | |
806 | NET_UNLOCK (&Wrap->IpInstance->RecycleLock);\r | |
807 | \r | |
808 | ASSERT (!NET_BUF_SHARED (Wrap->Packet));\r | |
809 | NetbufFree (Wrap->Packet);\r | |
810 | \r | |
811 | gBS->CloseEvent (Wrap->RxData.RecycleSignal);\r | |
812 | NetFreePool (Wrap);\r | |
813 | }\r | |
814 | \r | |
815 | \r | |
816 | /**\r | |
817 | Wrap the received packet to a IP4_RXDATA_WRAP, which will be\r | |
818 | delivered to the upper layer. Each IP4 child that accepts the\r | |
819 | packet will get a not-shared copy of the packet which is wrapped\r | |
820 | in the IP4_RXDATA_WRAP. The IP4_RXDATA_WRAP->RxData is passed\r | |
821 | to the upper layer. Upper layer will signal the recycle event in\r | |
822 | it when it is done with the packet.\r | |
823 | \r | |
824 | @param IpInstance The IP4 child to receive the packet\r | |
825 | @param Packet The packet to deliver up.\r | |
826 | \r | |
827 | @return NULL if failed to wrap the packet, otherwise the wrapper.\r | |
828 | \r | |
829 | **/\r | |
830 | IP4_RXDATA_WRAP *\r | |
831 | Ip4WrapRxData (\r | |
832 | IN IP4_PROTOCOL *IpInstance,\r | |
833 | IN NET_BUF *Packet\r | |
834 | )\r | |
835 | {\r | |
836 | IP4_RXDATA_WRAP *Wrap;\r | |
837 | EFI_IP4_RECEIVE_DATA *RxData;\r | |
838 | EFI_STATUS Status;\r | |
839 | \r | |
840 | Wrap = NetAllocatePool (IP4_RXDATA_WRAP_SIZE (Packet->BlockOpNum));\r | |
841 | \r | |
842 | if (Wrap == NULL) {\r | |
843 | return NULL;\r | |
844 | }\r | |
845 | \r | |
846 | NetListInit (&Wrap->Link);\r | |
847 | \r | |
848 | Wrap->IpInstance = IpInstance;\r | |
849 | Wrap->Packet = Packet;\r | |
850 | RxData = &Wrap->RxData;\r | |
851 | \r | |
852 | NetZeroMem (&RxData->TimeStamp, sizeof (EFI_TIME));\r | |
853 | \r | |
854 | Status = gBS->CreateEvent (\r | |
855 | EVT_NOTIFY_SIGNAL,\r | |
856 | NET_TPL_RECYCLE,\r | |
857 | Ip4OnRecyclePacket,\r | |
858 | Wrap,\r | |
859 | &RxData->RecycleSignal\r | |
860 | );\r | |
861 | \r | |
862 | if (EFI_ERROR (Status)) {\r | |
863 | NetFreePool (Wrap);\r | |
864 | return NULL;\r | |
865 | }\r | |
866 | \r | |
867 | ASSERT (Packet->Ip != NULL);\r | |
868 | \r | |
869 | //\r | |
870 | // The application expects a network byte order header.\r | |
871 | //\r | |
872 | RxData->HeaderLength = (Packet->Ip->HeadLen << 2);\r | |
873 | RxData->Header = (EFI_IP4_HEADER *) Ip4NtohHead (Packet->Ip);\r | |
874 | \r | |
875 | RxData->OptionsLength = RxData->HeaderLength - IP4_MIN_HEADLEN;\r | |
876 | RxData->Options = NULL;\r | |
877 | \r | |
878 | if (RxData->OptionsLength != 0) {\r | |
879 | RxData->Options = (VOID *) (RxData->Header + 1);\r | |
880 | }\r | |
881 | \r | |
882 | RxData->DataLength = Packet->TotalSize;\r | |
883 | \r | |
884 | //\r | |
885 | // Build the fragment table to be delivered up.\r | |
886 | //\r | |
887 | RxData->FragmentCount = Packet->BlockOpNum;\r | |
888 | NetbufBuildExt (Packet, (NET_FRAGMENT *) RxData->FragmentTable, &RxData->FragmentCount);\r | |
889 | \r | |
890 | return Wrap;\r | |
891 | }\r | |
892 | \r | |
893 | \r | |
894 | /**\r | |
895 | Deliver the received packets to upper layer if there are both received\r | |
896 | requests and enqueued packets. If the enqueued packet is shared, it will\r | |
897 | duplicate it to a non-shared packet, release the shared packet, then\r | |
898 | deliver the non-shared packet up.\r | |
899 | \r | |
900 | @param IpInstance The IP child to deliver the packet up.\r | |
901 | \r | |
902 | @retval EFI_OUT_OF_RESOURCES Failed to allocate resources to deliver the\r | |
903 | packets.\r | |
904 | @retval EFI_SUCCESS All the enqueued packets that can be delivered\r | |
905 | are delivered up.\r | |
906 | \r | |
907 | **/\r | |
908 | EFI_STATUS\r | |
909 | Ip4InstanceDeliverPacket (\r | |
910 | IN IP4_PROTOCOL *IpInstance\r | |
911 | )\r | |
912 | {\r | |
913 | EFI_IP4_COMPLETION_TOKEN *Token;\r | |
914 | IP4_RXDATA_WRAP *Wrap;\r | |
915 | NET_BUF *Packet;\r | |
916 | NET_BUF *Dup;\r | |
917 | UINT8 *Head;\r | |
918 | \r | |
919 | //\r | |
920 | // Deliver a packet if there are both a packet and a receive token.\r | |
921 | //\r | |
922 | while (!NetListIsEmpty (&IpInstance->Received) &&\r | |
923 | !NetMapIsEmpty (&IpInstance->RxTokens)) {\r | |
924 | \r | |
925 | Packet = NET_LIST_HEAD (&IpInstance->Received, NET_BUF, List);\r | |
926 | \r | |
927 | if (!NET_BUF_SHARED (Packet)) {\r | |
928 | //\r | |
929 | // If this is the only instance that wants the packet, wrap it up.\r | |
930 | //\r | |
931 | Wrap = Ip4WrapRxData (IpInstance, Packet);\r | |
932 | \r | |
933 | if (Wrap == NULL) {\r | |
934 | return EFI_OUT_OF_RESOURCES;\r | |
935 | }\r | |
936 | \r | |
937 | NetListRemoveEntry (&Packet->List);\r | |
938 | \r | |
939 | } else {\r | |
940 | //\r | |
941 | // Create a duplicated packet if this packet is shared\r | |
942 | //\r | |
943 | Dup = NetbufDuplicate (Packet, NULL, IP4_MAX_HEADLEN);\r | |
944 | \r | |
945 | if (Dup == NULL) {\r | |
946 | return EFI_OUT_OF_RESOURCES;\r | |
947 | }\r | |
948 | \r | |
949 | //\r | |
950 | // Copy the IP head over. The packet to deliver up is\r | |
951 | // headless. Trim the head off after copy. The IP head\r | |
952 | // may be not continuous before the data.\r | |
953 | //\r | |
954 | Head = NetbufAllocSpace (Dup, IP4_MAX_HEADLEN, NET_BUF_HEAD);\r | |
955 | Dup->Ip = (IP4_HEAD *) Head;\r | |
956 | \r | |
957 | NetCopyMem (Head, Packet->Ip, Packet->Ip->HeadLen << 2);\r | |
958 | NetbufTrim (Dup, IP4_MAX_HEADLEN, TRUE);\r | |
959 | \r | |
960 | Wrap = Ip4WrapRxData (IpInstance, Dup);\r | |
961 | \r | |
962 | if (Wrap == NULL) {\r | |
963 | NetbufFree (Dup);\r | |
964 | return EFI_OUT_OF_RESOURCES;\r | |
965 | }\r | |
966 | \r | |
967 | NetListRemoveEntry (&Packet->List);\r | |
968 | NetbufFree (Packet);\r | |
969 | \r | |
970 | Packet = Dup;\r | |
971 | }\r | |
972 | \r | |
973 | //\r | |
974 | // Insert it into the delivered packet, then get a user's\r | |
975 | // receive token, pass the wrapped packet up.\r | |
976 | //\r | |
977 | NET_TRYLOCK (&IpInstance->RecycleLock);\r | |
978 | NetListInsertHead (&IpInstance->Delivered, &Wrap->Link);\r | |
979 | NET_UNLOCK (&IpInstance->RecycleLock);\r | |
980 | \r | |
981 | Token = NetMapRemoveHead (&IpInstance->RxTokens, NULL);\r | |
982 | Token->Status = IP4_GET_CLIP_INFO (Packet)->Status;\r | |
983 | Token->Packet.RxData = &Wrap->RxData;\r | |
984 | \r | |
985 | gBS->SignalEvent (Token->Event);\r | |
986 | }\r | |
987 | \r | |
988 | return EFI_SUCCESS;\r | |
989 | }\r | |
990 | \r | |
991 | \r | |
992 | /**\r | |
993 | Enqueue a received packet to all the IP children that share\r | |
994 | the same interface.\r | |
995 | \r | |
996 | @param IpSb The IP4 service instance that receive the packet\r | |
997 | @param Head The header of the received packet\r | |
998 | @param Packet The data of the received packet\r | |
999 | @param IpIf The interface to enqueue the packet to\r | |
1000 | \r | |
1001 | @return The number of the IP4 children that accepts the packet\r | |
1002 | \r | |
1003 | **/\r | |
1004 | INTN\r | |
1005 | Ip4InterfaceEnquePacket (\r | |
1006 | IN IP4_SERVICE *IpSb,\r | |
1007 | IN IP4_HEAD *Head,\r | |
1008 | IN NET_BUF *Packet,\r | |
1009 | IN IP4_INTERFACE *IpIf\r | |
1010 | )\r | |
1011 | {\r | |
1012 | IP4_PROTOCOL *IpInstance;\r | |
1013 | IP4_CLIP_INFO *Info;\r | |
1014 | NET_LIST_ENTRY *Entry;\r | |
1015 | INTN Enqueued;\r | |
1016 | INTN LocalType;\r | |
1017 | INTN SavedType;\r | |
1018 | \r | |
1019 | //\r | |
1020 | // First, check that the packet is acceptable to this interface\r | |
1021 | // and find the local cast type for the interface. A packet sent\r | |
1022 | // to say 192.168.1.1 should NOT be delliever to 10.0.0.1 unless\r | |
1023 | // promiscuous receiving.\r | |
1024 | //\r | |
1025 | LocalType = 0;\r | |
1026 | Info = IP4_GET_CLIP_INFO (Packet);\r | |
1027 | \r | |
1028 | if ((Info->CastType == IP4_MULTICAST) || (Info->CastType == IP4_LOCAL_BROADCAST)) {\r | |
1029 | //\r | |
1030 | // If the CastType is multicast, don't need to filter against\r | |
1031 | // the group address here, Ip4InstanceFrameAcceptable will do\r | |
1032 | // that later.\r | |
1033 | //\r | |
1034 | LocalType = Info->CastType;\r | |
1035 | \r | |
1036 | } else {\r | |
1037 | //\r | |
1038 | // Check the destination againist local IP. If the station\r | |
1039 | // address is 0.0.0.0, it means receiving all the IP destined\r | |
1040 | // to local non-zero IP. Otherwise, it is necessary to compare\r | |
1041 | // the destination to the interface's IP address.\r | |
1042 | //\r | |
1043 | if (IpIf->Ip == IP4_ALLZERO_ADDRESS) {\r | |
1044 | LocalType = IP4_LOCAL_HOST;\r | |
1045 | \r | |
1046 | } else {\r | |
1047 | LocalType = Ip4GetNetCast (Head->Dst, IpIf);\r | |
1048 | \r | |
1049 | if ((LocalType == 0) && IpIf->PromiscRecv) {\r | |
1050 | LocalType = IP4_PROMISCUOUS;\r | |
1051 | }\r | |
1052 | }\r | |
1053 | }\r | |
1054 | \r | |
1055 | if (LocalType == 0) {\r | |
1056 | return 0;\r | |
1057 | }\r | |
1058 | \r | |
1059 | //\r | |
1060 | // Iterate through the ip instances on the interface, enqueue\r | |
1061 | // the packet if filter passed. Save the original cast type,\r | |
1062 | // and pass the local cast type to the IP children on the\r | |
1063 | // interface. The global cast type will be restored later.\r | |
1064 | //\r | |
1065 | SavedType = Info->CastType;\r | |
1066 | Info->CastType = LocalType;\r | |
1067 | \r | |
1068 | Enqueued = 0;\r | |
1069 | \r | |
1070 | NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {\r | |
1071 | IpInstance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);\r | |
1072 | NET_CHECK_SIGNATURE (IpInstance, IP4_PROTOCOL_SIGNATURE);\r | |
1073 | \r | |
1074 | if (Ip4InstanceEnquePacket (IpInstance, Head, Packet) == EFI_SUCCESS) {\r | |
1075 | Enqueued++;\r | |
1076 | }\r | |
1077 | }\r | |
1078 | \r | |
1079 | Info->CastType = SavedType;\r | |
1080 | return Enqueued;\r | |
1081 | }\r | |
1082 | \r | |
1083 | \r | |
1084 | /**\r | |
1085 | Deliver the packet for each IP4 child on the interface.\r | |
1086 | \r | |
1087 | @param IpSb The IP4 service instance that received the packet\r | |
1088 | @param IpIf The IP4 interface to deliver the packet.\r | |
1089 | \r | |
1090 | @retval EFI_SUCCESS It always returns EFI_SUCCESS now\r | |
1091 | \r | |
1092 | **/\r | |
1093 | EFI_STATUS\r | |
1094 | Ip4InterfaceDeliverPacket (\r | |
1095 | IN IP4_SERVICE *IpSb,\r | |
1096 | IN IP4_INTERFACE *IpIf\r | |
1097 | )\r | |
1098 | {\r | |
1099 | IP4_PROTOCOL *Ip4Instance;\r | |
1100 | NET_LIST_ENTRY *Entry;\r | |
1101 | \r | |
1102 | NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {\r | |
1103 | Ip4Instance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);\r | |
1104 | Ip4InstanceDeliverPacket (Ip4Instance);\r | |
1105 | }\r | |
1106 | \r | |
1107 | return EFI_SUCCESS;\r | |
1108 | }\r | |
1109 | \r | |
1110 | \r | |
1111 | /**\r | |
1112 | Demultiple the packet. the packet delivery is processed in two\r | |
1113 | passes. The first pass will enque a shared copy of the packet\r | |
1114 | to each IP4 child that accepts the packet. The second pass will\r | |
1115 | deliver a non-shared copy of the packet to each IP4 child that\r | |
1116 | has pending receive requests. Data is copied if more than one\r | |
1117 | child wants to consume the packet bacause each IP child need\r | |
1118 | its own copy of the packet to make changes.\r | |
1119 | \r | |
1120 | @param IpSb The IP4 service instance that received the packet\r | |
1121 | @param Head The header of the received packet\r | |
1122 | @param Packet The data of the received packet\r | |
1123 | \r | |
1124 | @retval EFI_NOT_FOUND No IP child accepts the packet\r | |
1125 | @retval EFI_SUCCESS The packet is enqueued or delivered to some IP\r | |
1126 | children.\r | |
1127 | \r | |
1128 | **/\r | |
1129 | EFI_STATUS\r | |
1130 | Ip4Demultiplex (\r | |
1131 | IN IP4_SERVICE *IpSb,\r | |
1132 | IN IP4_HEAD *Head,\r | |
1133 | IN NET_BUF *Packet\r | |
1134 | )\r | |
1135 | {\r | |
1136 | NET_LIST_ENTRY *Entry;\r | |
1137 | IP4_INTERFACE *IpIf;\r | |
1138 | INTN Enqueued;\r | |
1139 | \r | |
1140 | //\r | |
1141 | // Two pass delivery: first, enque a shared copy of the packet\r | |
1142 | // to each instance that accept the packet.\r | |
1143 | //\r | |
1144 | Enqueued = 0;\r | |
1145 | \r | |
1146 | NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {\r | |
1147 | IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);\r | |
1148 | \r | |
1149 | if (IpIf->Configured) {\r | |
1150 | Enqueued += Ip4InterfaceEnquePacket (IpSb, Head, Packet, IpIf);\r | |
1151 | }\r | |
1152 | }\r | |
1153 | \r | |
1154 | //\r | |
1155 | // Second: deliver a duplicate of the packet to each instance.\r | |
1156 | // Release the local reference first, so that the last instance\r | |
1157 | // getting the packet will not copy the data.\r | |
1158 | //\r | |
1159 | NetbufFree (Packet);\r | |
1160 | \r | |
1161 | if (Enqueued == 0) {\r | |
1162 | return EFI_NOT_FOUND;\r | |
1163 | }\r | |
1164 | \r | |
1165 | NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {\r | |
1166 | IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);\r | |
1167 | \r | |
1168 | if (IpIf->Configured) {\r | |
1169 | Ip4InterfaceDeliverPacket (IpSb, IpIf);\r | |
1170 | }\r | |
1171 | }\r | |
1172 | \r | |
1173 | return EFI_SUCCESS;\r | |
1174 | }\r | |
1175 | \r | |
1176 | \r | |
1177 | /**\r | |
1178 | Timeout the fragment and enqueued packets.\r | |
1179 | \r | |
1180 | @param IpSb The IP4 service instance to timeout\r | |
1181 | \r | |
1182 | @return None\r | |
1183 | \r | |
1184 | **/\r | |
1185 | VOID\r | |
1186 | Ip4PacketTimerTicking (\r | |
1187 | IN IP4_SERVICE *IpSb\r | |
1188 | )\r | |
1189 | {\r | |
1190 | NET_LIST_ENTRY *InstanceEntry;\r | |
1191 | NET_LIST_ENTRY *Entry;\r | |
1192 | NET_LIST_ENTRY *Next;\r | |
1193 | IP4_PROTOCOL *IpInstance;\r | |
1194 | IP4_ASSEMBLE_ENTRY *Assemble;\r | |
1195 | NET_BUF *Packet;\r | |
1196 | IP4_CLIP_INFO *Info;\r | |
1197 | UINT32 Index;\r | |
1198 | \r | |
1199 | //\r | |
1200 | // First, time out the fragments. The packet's life is counting down\r | |
1201 | // once the first-arrived fragment was received.\r | |
1202 | //\r | |
1203 | for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {\r | |
1204 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpSb->Assemble.Bucket[Index]) {\r | |
1205 | Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);\r | |
1206 | \r | |
1207 | if ((Assemble->Life > 0) && (--Assemble->Life == 0)) {\r | |
1208 | NetListRemoveEntry (Entry);\r | |
1209 | Ip4FreeAssembleEntry (Assemble);\r | |
1210 | }\r | |
1211 | }\r | |
1212 | }\r | |
1213 | \r | |
1214 | NET_LIST_FOR_EACH (InstanceEntry, &IpSb->Children) {\r | |
1215 | IpInstance = NET_LIST_USER_STRUCT (InstanceEntry, IP4_PROTOCOL, Link);\r | |
1216 | \r | |
1217 | //\r | |
1218 | // Second, time out the assembled packets enqueued on each IP child.\r | |
1219 | //\r | |
1220 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpInstance->Received) {\r | |
1221 | Packet = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1222 | Info = IP4_GET_CLIP_INFO (Packet);\r | |
1223 | \r | |
1224 | if ((Info->Life > 0) && (--Info->Life == 0)) {\r | |
1225 | NetListRemoveEntry (Entry);\r | |
1226 | NetbufFree (Packet);\r | |
1227 | }\r | |
1228 | }\r | |
1229 | \r | |
1230 | //\r | |
1231 | // Third: time out the transmitted packets.\r | |
1232 | //\r | |
1233 | NetMapIterate (&IpInstance->TxTokens, Ip4SentPacketTicking, NULL);\r | |
1234 | }\r | |
1235 | }\r |