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1 | /** @file\r | |
2 | TCP input process routines.\r | |
3 | \r | |
4 | Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
5 | \r | |
6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
7 | \r | |
8 | **/\r | |
9 | \r | |
10 | #include "TcpMain.h"\r | |
11 | \r | |
12 | /**\r | |
13 | Check whether the sequence number of the incoming segment is acceptable.\r | |
14 | \r | |
15 | @param[in] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
16 | @param[in] Seg Pointer to the incoming segment.\r | |
17 | \r | |
18 | @retval 1 The sequence number is acceptable.\r | |
19 | @retval 0 The sequence number is not acceptable.\r | |
20 | \r | |
21 | **/\r | |
22 | INTN\r | |
23 | TcpSeqAcceptable (\r | |
24 | IN TCP_CB *Tcb,\r | |
25 | IN TCP_SEG *Seg\r | |
26 | )\r | |
27 | {\r | |
28 | return (TCP_SEQ_LEQ (Tcb->RcvNxt, Seg->End) &&\r | |
29 | TCP_SEQ_LT (Seg->Seq, Tcb->RcvWl2 + Tcb->RcvWnd));\r | |
30 | }\r | |
31 | \r | |
32 | /**\r | |
33 | NewReno fast recovery defined in RFC3782.\r | |
34 | \r | |
35 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
36 | @param[in] Seg Segment that triggers the fast recovery.\r | |
37 | \r | |
38 | **/\r | |
39 | VOID\r | |
40 | TcpFastRecover (\r | |
41 | IN OUT TCP_CB *Tcb,\r | |
42 | IN TCP_SEG *Seg\r | |
43 | )\r | |
44 | {\r | |
45 | UINT32 FlightSize;\r | |
46 | UINT32 Acked;\r | |
47 | \r | |
48 | //\r | |
49 | // Step 1: Three duplicate ACKs and not in fast recovery\r | |
50 | //\r | |
51 | if (Tcb->CongestState != TCP_CONGEST_RECOVER) {\r | |
52 | \r | |
53 | //\r | |
54 | // Step 1A: Invoking fast retransmission.\r | |
55 | //\r | |
56 | FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);\r | |
57 | \r | |
58 | Tcb->Ssthresh = MAX (FlightSize >> 1, (UINT32) (2 * Tcb->SndMss));\r | |
59 | Tcb->Recover = Tcb->SndNxt;\r | |
60 | \r | |
61 | Tcb->CongestState = TCP_CONGEST_RECOVER;\r | |
62 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
63 | \r | |
64 | //\r | |
65 | // Step 2: Entering fast retransmission\r | |
66 | //\r | |
67 | TcpRetransmit (Tcb, Tcb->SndUna);\r | |
68 | Tcb->CWnd = Tcb->Ssthresh + 3 * Tcb->SndMss;\r | |
69 | \r | |
70 | DEBUG (\r | |
71 | (EFI_D_NET,\r | |
72 | "TcpFastRecover: enter fast retransmission for TCB %p, recover point is %d\n",\r | |
73 | Tcb,\r | |
74 | Tcb->Recover)\r | |
75 | );\r | |
76 | return;\r | |
77 | }\r | |
78 | \r | |
79 | //\r | |
80 | // During fast recovery, execute Step 3, 4, 5 of RFC3782\r | |
81 | //\r | |
82 | if (Seg->Ack == Tcb->SndUna) {\r | |
83 | \r | |
84 | //\r | |
85 | // Step 3: Fast Recovery,\r | |
86 | // If this is a duplicated ACK, increse Cwnd by SMSS.\r | |
87 | //\r | |
88 | \r | |
89 | // Step 4 is skipped here only to be executed later\r | |
90 | // by TcpToSendData\r | |
91 | //\r | |
92 | Tcb->CWnd += Tcb->SndMss;\r | |
93 | DEBUG (\r | |
94 | (EFI_D_NET,\r | |
95 | "TcpFastRecover: received another duplicated ACK (%d) for TCB %p\n",\r | |
96 | Seg->Ack,\r | |
97 | Tcb)\r | |
98 | );\r | |
99 | \r | |
100 | } else {\r | |
101 | \r | |
102 | //\r | |
103 | // New data is ACKed, check whether it is a\r | |
104 | // full ACK or partial ACK\r | |
105 | //\r | |
106 | if (TCP_SEQ_GEQ (Seg->Ack, Tcb->Recover)) {\r | |
107 | \r | |
108 | //\r | |
109 | // Step 5 - Full ACK:\r | |
110 | // deflate the congestion window, and exit fast recovery\r | |
111 | //\r | |
112 | FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);\r | |
113 | \r | |
114 | Tcb->CWnd = MIN (Tcb->Ssthresh, FlightSize + Tcb->SndMss);\r | |
115 | \r | |
116 | Tcb->CongestState = TCP_CONGEST_OPEN;\r | |
117 | DEBUG (\r | |
118 | (EFI_D_NET,\r | |
119 | "TcpFastRecover: received a full ACK(%d) for TCB %p, exit fast recovery\n",\r | |
120 | Seg->Ack,\r | |
121 | Tcb)\r | |
122 | );\r | |
123 | \r | |
124 | } else {\r | |
125 | \r | |
126 | //\r | |
127 | // Step 5 - Partial ACK:\r | |
128 | // fast retransmit the first unacknowledge field\r | |
129 | // , then deflate the CWnd\r | |
130 | //\r | |
131 | TcpRetransmit (Tcb, Seg->Ack);\r | |
132 | Acked = TCP_SUB_SEQ (Seg->Ack, Tcb->SndUna);\r | |
133 | \r | |
134 | //\r | |
135 | // Deflate the CWnd by the amount of new data\r | |
136 | // ACKed by SEG.ACK. If more than one SMSS data\r | |
137 | // is ACKed, add back SMSS byte to CWnd after\r | |
138 | //\r | |
139 | if (Acked >= Tcb->SndMss) {\r | |
140 | Acked -= Tcb->SndMss;\r | |
141 | \r | |
142 | }\r | |
143 | \r | |
144 | Tcb->CWnd -= Acked;\r | |
145 | \r | |
146 | DEBUG (\r | |
147 | (EFI_D_NET,\r | |
148 | "TcpFastRecover: received a partial ACK(%d) for TCB %p\n",\r | |
149 | Seg->Ack,\r | |
150 | Tcb)\r | |
151 | );\r | |
152 | \r | |
153 | }\r | |
154 | }\r | |
155 | }\r | |
156 | \r | |
157 | /**\r | |
158 | NewReno fast loss recovery defined in RFC3792.\r | |
159 | \r | |
160 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
161 | @param[in] Seg Segment that triggers the fast loss recovery.\r | |
162 | \r | |
163 | **/\r | |
164 | VOID\r | |
165 | TcpFastLossRecover (\r | |
166 | IN OUT TCP_CB *Tcb,\r | |
167 | IN TCP_SEG *Seg\r | |
168 | )\r | |
169 | {\r | |
170 | if (TCP_SEQ_GT (Seg->Ack, Tcb->SndUna)) {\r | |
171 | \r | |
172 | //\r | |
173 | // New data is ACKed, check whether it is a\r | |
174 | // full ACK or partial ACK\r | |
175 | //\r | |
176 | if (TCP_SEQ_GEQ (Seg->Ack, Tcb->LossRecover)) {\r | |
177 | \r | |
178 | //\r | |
179 | // Full ACK: exit the loss recovery.\r | |
180 | //\r | |
181 | Tcb->LossTimes = 0;\r | |
182 | Tcb->CongestState = TCP_CONGEST_OPEN;\r | |
183 | \r | |
184 | DEBUG (\r | |
185 | (EFI_D_NET,\r | |
186 | "TcpFastLossRecover: received a full ACK(%d) for TCB %p\n",\r | |
187 | Seg->Ack,\r | |
188 | Tcb)\r | |
189 | );\r | |
190 | \r | |
191 | } else {\r | |
192 | \r | |
193 | //\r | |
194 | // Partial ACK:\r | |
195 | // fast retransmit the first unacknowledge field.\r | |
196 | //\r | |
197 | TcpRetransmit (Tcb, Seg->Ack);\r | |
198 | DEBUG (\r | |
199 | (EFI_D_NET,\r | |
200 | "TcpFastLossRecover: received a partial ACK(%d) for TCB %p\n",\r | |
201 | Seg->Ack,\r | |
202 | Tcb)\r | |
203 | );\r | |
204 | }\r | |
205 | }\r | |
206 | }\r | |
207 | \r | |
208 | /**\r | |
209 | Compute the RTT as specified in RFC2988.\r | |
210 | \r | |
211 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
212 | @param[in] Measure Currently measured RTT in heartbeats.\r | |
213 | \r | |
214 | **/\r | |
215 | VOID\r | |
216 | TcpComputeRtt (\r | |
217 | IN OUT TCP_CB *Tcb,\r | |
218 | IN UINT32 Measure\r | |
219 | )\r | |
220 | {\r | |
221 | INT32 Var;\r | |
222 | \r | |
223 | //\r | |
224 | // Step 2.3: Compute the RTO for subsequent RTT measurement.\r | |
225 | //\r | |
226 | if (Tcb->SRtt != 0) {\r | |
227 | \r | |
228 | Var = Tcb->SRtt - (Measure << TCP_RTT_SHIFT);\r | |
229 | \r | |
230 | if (Var < 0) {\r | |
231 | Var = -Var;\r | |
232 | }\r | |
233 | \r | |
234 | Tcb->RttVar = (3 * Tcb->RttVar + Var) >> 2;\r | |
235 | Tcb->SRtt = 7 * (Tcb->SRtt >> 3) + Measure;\r | |
236 | \r | |
237 | } else {\r | |
238 | //\r | |
239 | // Step 2.2: compute the first RTT measure\r | |
240 | //\r | |
241 | Tcb->SRtt = Measure << TCP_RTT_SHIFT;\r | |
242 | Tcb->RttVar = Measure << (TCP_RTT_SHIFT - 1);\r | |
243 | }\r | |
244 | \r | |
245 | Tcb->Rto = (Tcb->SRtt + MAX (8, 4 * Tcb->RttVar)) >> TCP_RTT_SHIFT;\r | |
246 | \r | |
247 | //\r | |
248 | // Step 2.4: Limit the RTO to at least 1 second\r | |
249 | // Step 2.5: Limit the RTO to a maximum value that\r | |
250 | // is at least 60 second\r | |
251 | //\r | |
252 | if (Tcb->Rto < TCP_RTO_MIN) {\r | |
253 | Tcb->Rto = TCP_RTO_MIN;\r | |
254 | \r | |
255 | } else if (Tcb->Rto > TCP_RTO_MAX) {\r | |
256 | Tcb->Rto = TCP_RTO_MAX;\r | |
257 | \r | |
258 | }\r | |
259 | \r | |
260 | DEBUG (\r | |
261 | (EFI_D_NET,\r | |
262 | "TcpComputeRtt: new RTT for TCB %p computed SRTT: %d RTTVAR: %d RTO: %d\n",\r | |
263 | Tcb,\r | |
264 | Tcb->SRtt,\r | |
265 | Tcb->RttVar,\r | |
266 | Tcb->Rto)\r | |
267 | );\r | |
268 | \r | |
269 | }\r | |
270 | \r | |
271 | /**\r | |
272 | Trim the data; SYN and FIN to fit into the window defined by Left and Right.\r | |
273 | \r | |
274 | @param[in] Nbuf The buffer that contains a received TCP segment without an IP header.\r | |
275 | @param[in] Left The sequence number of the window's left edge.\r | |
276 | @param[in] Right The sequence number of the window's right edge.\r | |
277 | \r | |
278 | @retval 0 The segment is broken.\r | |
279 | @retval 1 The segment is in good shape.\r | |
280 | \r | |
281 | **/\r | |
282 | INTN\r | |
283 | TcpTrimSegment (\r | |
284 | IN NET_BUF *Nbuf,\r | |
285 | IN TCP_SEQNO Left,\r | |
286 | IN TCP_SEQNO Right\r | |
287 | )\r | |
288 | {\r | |
289 | TCP_SEG *Seg;\r | |
290 | TCP_SEQNO Urg;\r | |
291 | UINT32 Drop;\r | |
292 | \r | |
293 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
294 | \r | |
295 | //\r | |
296 | // If the segment is completely out of window,\r | |
297 | // truncate every thing, include SYN and FIN.\r | |
298 | //\r | |
299 | if (TCP_SEQ_LEQ (Seg->End, Left) || TCP_SEQ_LEQ (Right, Seg->Seq)) {\r | |
300 | \r | |
301 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_SYN);\r | |
302 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_FIN);\r | |
303 | \r | |
304 | Seg->Seq = Seg->End;\r | |
305 | NetbufTrim (Nbuf, Nbuf->TotalSize, NET_BUF_HEAD);\r | |
306 | return 1;\r | |
307 | }\r | |
308 | \r | |
309 | //\r | |
310 | // Adjust the buffer header\r | |
311 | //\r | |
312 | if (TCP_SEQ_LT (Seg->Seq, Left)) {\r | |
313 | \r | |
314 | Drop = TCP_SUB_SEQ (Left, Seg->Seq);\r | |
315 | Urg = Seg->Seq + Seg->Urg;\r | |
316 | Seg->Seq = Left;\r | |
317 | \r | |
318 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
319 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_SYN);\r | |
320 | Drop--;\r | |
321 | }\r | |
322 | \r | |
323 | //\r | |
324 | // Adjust the urgent point\r | |
325 | //\r | |
326 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_URG)) {\r | |
327 | \r | |
328 | if (TCP_SEQ_LT (Urg, Seg->Seq)) {\r | |
329 | \r | |
330 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_URG);\r | |
331 | } else {\r | |
332 | Seg->Urg = (UINT16) TCP_SUB_SEQ (Urg, Seg->Seq);\r | |
333 | }\r | |
334 | }\r | |
335 | \r | |
336 | if (Drop != 0) {\r | |
337 | NetbufTrim (Nbuf, Drop, NET_BUF_HEAD);\r | |
338 | }\r | |
339 | }\r | |
340 | \r | |
341 | //\r | |
342 | // Adjust the buffer tail\r | |
343 | //\r | |
344 | if (TCP_SEQ_GT (Seg->End, Right)) {\r | |
345 | \r | |
346 | Drop = TCP_SUB_SEQ (Seg->End, Right);\r | |
347 | Seg->End = Right;\r | |
348 | \r | |
349 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_FIN)) {\r | |
350 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_FIN);\r | |
351 | Drop--;\r | |
352 | }\r | |
353 | \r | |
354 | if (Drop != 0) {\r | |
355 | NetbufTrim (Nbuf, Drop, NET_BUF_TAIL);\r | |
356 | }\r | |
357 | }\r | |
358 | \r | |
359 | return TcpVerifySegment (Nbuf);\r | |
360 | }\r | |
361 | \r | |
362 | /**\r | |
363 | Trim off the data outside the tcb's receive window.\r | |
364 | \r | |
365 | @param[in] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
366 | @param[in] Nbuf Pointer to the NET_BUF containing the received tcp segment.\r | |
367 | \r | |
368 | @retval 0 The segment is broken.\r | |
369 | @retval 1 The segment is in good shape.\r | |
370 | \r | |
371 | **/\r | |
372 | INTN\r | |
373 | TcpTrimInWnd (\r | |
374 | IN TCP_CB *Tcb,\r | |
375 | IN NET_BUF *Nbuf\r | |
376 | )\r | |
377 | {\r | |
378 | return TcpTrimSegment (Nbuf, Tcb->RcvNxt, Tcb->RcvWl2 + Tcb->RcvWnd);\r | |
379 | }\r | |
380 | \r | |
381 | /**\r | |
382 | Process the data and FIN flag, and check whether to deliver\r | |
383 | data to the socket layer.\r | |
384 | \r | |
385 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
386 | \r | |
387 | @retval 0 No error occurred to deliver data.\r | |
388 | @retval -1 An error condition occurred. The proper response is to reset the\r | |
389 | connection.\r | |
390 | \r | |
391 | **/\r | |
392 | INTN\r | |
393 | TcpDeliverData (\r | |
394 | IN OUT TCP_CB *Tcb\r | |
395 | )\r | |
396 | {\r | |
397 | LIST_ENTRY *Entry;\r | |
398 | NET_BUF *Nbuf;\r | |
399 | TCP_SEQNO Seq;\r | |
400 | TCP_SEG *Seg;\r | |
401 | UINT32 Urgent;\r | |
402 | \r | |
403 | ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL));\r | |
404 | \r | |
405 | //\r | |
406 | // make sure there is some data queued,\r | |
407 | // and TCP is in a proper state\r | |
408 | //\r | |
409 | if (IsListEmpty (&Tcb->RcvQue) || !TCP_CONNECTED (Tcb->State)) {\r | |
410 | \r | |
411 | return 0;\r | |
412 | }\r | |
413 | \r | |
414 | //\r | |
415 | // Deliver data to the socket layer\r | |
416 | //\r | |
417 | Entry = Tcb->RcvQue.ForwardLink;\r | |
418 | Seq = Tcb->RcvNxt;\r | |
419 | \r | |
420 | while (Entry != &Tcb->RcvQue) {\r | |
421 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
422 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
423 | \r | |
424 | if (TcpVerifySegment (Nbuf) == 0) {\r | |
425 | DEBUG (\r | |
426 | (EFI_D_ERROR,\r | |
427 | "TcpToSendData: discard a broken segment for TCB %p\n",\r | |
428 | Tcb)\r | |
429 | );\r | |
430 | NetbufFree (Nbuf);\r | |
431 | return -1;\r | |
432 | }\r | |
433 | \r | |
434 | ASSERT (Nbuf->Tcp == NULL);\r | |
435 | \r | |
436 | if (TCP_SEQ_GT (Seg->Seq, Seq)) {\r | |
437 | break;\r | |
438 | }\r | |
439 | \r | |
440 | Entry = Entry->ForwardLink;\r | |
441 | Seq = Seg->End;\r | |
442 | Tcb->RcvNxt = Seq;\r | |
443 | \r | |
444 | RemoveEntryList (&Nbuf->List);\r | |
445 | \r | |
446 | //\r | |
447 | // RFC793 Eighth step: process FIN in sequence\r | |
448 | //\r | |
449 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_FIN)) {\r | |
450 | \r | |
451 | //\r | |
452 | // The peer sends to us junky data after FIN,\r | |
453 | // reset the connection.\r | |
454 | //\r | |
455 | if (!IsListEmpty (&Tcb->RcvQue)) {\r | |
456 | DEBUG (\r | |
457 | (EFI_D_ERROR,\r | |
458 | "TcpDeliverData: data received after FIN from peer of TCB %p, reset connection\n",\r | |
459 | Tcb)\r | |
460 | );\r | |
461 | \r | |
462 | NetbufFree (Nbuf);\r | |
463 | return -1;\r | |
464 | }\r | |
465 | \r | |
466 | DEBUG (\r | |
467 | (EFI_D_NET,\r | |
468 | "TcpDeliverData: processing FIN from peer of TCB %p\n",\r | |
469 | Tcb)\r | |
470 | );\r | |
471 | \r | |
472 | switch (Tcb->State) {\r | |
473 | case TCP_SYN_RCVD:\r | |
474 | case TCP_ESTABLISHED:\r | |
475 | \r | |
476 | TcpSetState (Tcb, TCP_CLOSE_WAIT);\r | |
477 | break;\r | |
478 | \r | |
479 | case TCP_FIN_WAIT_1:\r | |
480 | \r | |
481 | if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
482 | \r | |
483 | TcpSetState (Tcb, TCP_CLOSING);\r | |
484 | break;\r | |
485 | }\r | |
486 | \r | |
487 | //\r | |
488 | // fall through\r | |
489 | //\r | |
490 | case TCP_FIN_WAIT_2:\r | |
491 | \r | |
492 | TcpSetState (Tcb, TCP_TIME_WAIT);\r | |
493 | TcpClearAllTimer (Tcb);\r | |
494 | \r | |
495 | if (Tcb->TimeWaitTimeout != 0) {\r | |
496 | \r | |
497 | TcpSetTimer (Tcb, TCP_TIMER_2MSL, Tcb->TimeWaitTimeout);\r | |
498 | } else {\r | |
499 | \r | |
500 | DEBUG (\r | |
501 | (EFI_D_WARN,\r | |
502 | "Connection closed immediately because app disables TIME_WAIT timer for %p\n",\r | |
503 | Tcb)\r | |
504 | );\r | |
505 | \r | |
506 | TcpSendAck (Tcb);\r | |
507 | TcpClose (Tcb);\r | |
508 | }\r | |
509 | break;\r | |
510 | \r | |
511 | case TCP_CLOSE_WAIT:\r | |
512 | case TCP_CLOSING:\r | |
513 | case TCP_LAST_ACK:\r | |
514 | case TCP_TIME_WAIT:\r | |
515 | //\r | |
516 | // The peer sends to us junk FIN byte. Discard\r | |
517 | // the buffer then reset the connection\r | |
518 | //\r | |
519 | NetbufFree (Nbuf);\r | |
520 | return -1;\r | |
521 | break;\r | |
522 | default:\r | |
523 | break;\r | |
524 | }\r | |
525 | \r | |
526 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
527 | \r | |
528 | Seg->End--;\r | |
529 | }\r | |
530 | \r | |
531 | //\r | |
532 | // Don't delay the ack if PUSH flag is on.\r | |
533 | //\r | |
534 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_PSH)) {\r | |
535 | \r | |
536 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
537 | }\r | |
538 | \r | |
539 | if (Nbuf->TotalSize != 0) {\r | |
540 | Urgent = 0;\r | |
541 | \r | |
542 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_URG) &&\r | |
543 | TCP_SEQ_LEQ (Seg->Seq, Tcb->RcvUp))\r | |
544 | {\r | |
545 | \r | |
546 | if (TCP_SEQ_LEQ (Seg->End, Tcb->RcvUp)) {\r | |
547 | Urgent = Nbuf->TotalSize;\r | |
548 | } else {\r | |
549 | Urgent = TCP_SUB_SEQ (Tcb->RcvUp, Seg->Seq) + 1;\r | |
550 | }\r | |
551 | }\r | |
552 | \r | |
553 | SockDataRcvd (Tcb->Sk, Nbuf, Urgent);\r | |
554 | }\r | |
555 | \r | |
556 | if (TCP_FIN_RCVD (Tcb->State)) {\r | |
557 | \r | |
558 | SockNoMoreData (Tcb->Sk);\r | |
559 | }\r | |
560 | \r | |
561 | NetbufFree (Nbuf);\r | |
562 | }\r | |
563 | \r | |
564 | return 0;\r | |
565 | }\r | |
566 | \r | |
567 | /**\r | |
568 | Store the data into the reassemble queue.\r | |
569 | \r | |
570 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
571 | @param[in] Nbuf Pointer to the buffer containing the data to be queued.\r | |
572 | \r | |
573 | @retval 0 An error condition occurred.\r | |
574 | @retval 1 No error occurred to queue data.\r | |
575 | \r | |
576 | **/\r | |
577 | INTN\r | |
578 | TcpQueueData (\r | |
579 | IN OUT TCP_CB *Tcb,\r | |
580 | IN NET_BUF *Nbuf\r | |
581 | )\r | |
582 | {\r | |
583 | TCP_SEG *Seg;\r | |
584 | LIST_ENTRY *Head;\r | |
585 | LIST_ENTRY *Prev;\r | |
586 | LIST_ENTRY *Cur;\r | |
587 | NET_BUF *Node;\r | |
588 | \r | |
589 | ASSERT ((Tcb != NULL) && (Nbuf != NULL) && (Nbuf->Tcp == NULL));\r | |
590 | \r | |
591 | NET_GET_REF (Nbuf);\r | |
592 | \r | |
593 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
594 | Head = &Tcb->RcvQue;\r | |
595 | \r | |
596 | //\r | |
597 | // Fast path to process normal case. That is,\r | |
598 | // no out-of-order segments are received.\r | |
599 | //\r | |
600 | if (IsListEmpty (Head)) {\r | |
601 | \r | |
602 | InsertTailList (Head, &Nbuf->List);\r | |
603 | return 1;\r | |
604 | }\r | |
605 | \r | |
606 | //\r | |
607 | // Find the point to insert the buffer\r | |
608 | //\r | |
609 | for (Prev = Head, Cur = Head->ForwardLink;\r | |
610 | Cur != Head;\r | |
611 | Prev = Cur, Cur = Cur->ForwardLink) {\r | |
612 | \r | |
613 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
614 | \r | |
615 | if (TCP_SEQ_LT (Seg->Seq, TCPSEG_NETBUF (Node)->Seq)) {\r | |
616 | break;\r | |
617 | }\r | |
618 | }\r | |
619 | \r | |
620 | //\r | |
621 | // Check whether the current segment overlaps with the\r | |
622 | // previous segment.\r | |
623 | //\r | |
624 | if (Prev != Head) {\r | |
625 | Node = NET_LIST_USER_STRUCT (Prev, NET_BUF, List);\r | |
626 | \r | |
627 | if (TCP_SEQ_LT (Seg->Seq, TCPSEG_NETBUF (Node)->End)) {\r | |
628 | \r | |
629 | if (TCP_SEQ_LEQ (Seg->End, TCPSEG_NETBUF (Node)->End)) {\r | |
630 | return 1;\r | |
631 | }\r | |
632 | \r | |
633 | if (TcpTrimSegment (Nbuf, TCPSEG_NETBUF (Node)->End, Seg->End) == 0) {\r | |
634 | return 0;\r | |
635 | }\r | |
636 | }\r | |
637 | }\r | |
638 | \r | |
639 | InsertHeadList (Prev, &Nbuf->List);\r | |
640 | \r | |
641 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
642 | \r | |
643 | //\r | |
644 | // Check the segments after the insert point.\r | |
645 | //\r | |
646 | while (Cur != Head) {\r | |
647 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
648 | \r | |
649 | if (TCP_SEQ_LEQ (TCPSEG_NETBUF (Node)->End, Seg->End)) {\r | |
650 | \r | |
651 | Cur = Cur->ForwardLink;\r | |
652 | \r | |
653 | RemoveEntryList (&Node->List);\r | |
654 | NetbufFree (Node);\r | |
655 | continue;\r | |
656 | }\r | |
657 | \r | |
658 | if (TCP_SEQ_LT (TCPSEG_NETBUF (Node)->Seq, Seg->End)) {\r | |
659 | \r | |
660 | if (TCP_SEQ_LEQ (TCPSEG_NETBUF (Node)->Seq, Seg->Seq)) {\r | |
661 | \r | |
662 | RemoveEntryList (&Nbuf->List);\r | |
663 | return 1;\r | |
664 | }\r | |
665 | \r | |
666 | if (TcpTrimSegment (Nbuf, Seg->Seq, TCPSEG_NETBUF (Node)->Seq) == 0) {\r | |
667 | RemoveEntryList (&Nbuf->List);\r | |
668 | return 0;\r | |
669 | }\r | |
670 | break;\r | |
671 | }\r | |
672 | \r | |
673 | Cur = Cur->ForwardLink;\r | |
674 | }\r | |
675 | \r | |
676 | return 1;\r | |
677 | }\r | |
678 | \r | |
679 | \r | |
680 | /**\r | |
681 | Adjust the send queue or the retransmit queue.\r | |
682 | \r | |
683 | @param[in] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
684 | @param[in] Ack The acknowledge sequence number of the received segment.\r | |
685 | \r | |
686 | @retval 0 An error condition occurred.\r | |
687 | @retval 1 No error occurred.\r | |
688 | \r | |
689 | **/\r | |
690 | INTN\r | |
691 | TcpAdjustSndQue (\r | |
692 | IN TCP_CB *Tcb,\r | |
693 | IN TCP_SEQNO Ack\r | |
694 | )\r | |
695 | {\r | |
696 | LIST_ENTRY *Head;\r | |
697 | LIST_ENTRY *Cur;\r | |
698 | NET_BUF *Node;\r | |
699 | TCP_SEG *Seg;\r | |
700 | \r | |
701 | Head = &Tcb->SndQue;\r | |
702 | Cur = Head->ForwardLink;\r | |
703 | \r | |
704 | while (Cur != Head) {\r | |
705 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
706 | Seg = TCPSEG_NETBUF (Node);\r | |
707 | \r | |
708 | if (TCP_SEQ_GEQ (Seg->Seq, Ack)) {\r | |
709 | break;\r | |
710 | }\r | |
711 | \r | |
712 | //\r | |
713 | // Remove completely ACKed segments\r | |
714 | //\r | |
715 | if (TCP_SEQ_LEQ (Seg->End, Ack)) {\r | |
716 | Cur = Cur->ForwardLink;\r | |
717 | \r | |
718 | RemoveEntryList (&Node->List);\r | |
719 | NetbufFree (Node);\r | |
720 | continue;\r | |
721 | }\r | |
722 | \r | |
723 | return TcpTrimSegment (Node, Ack, Seg->End);\r | |
724 | }\r | |
725 | \r | |
726 | return 1;\r | |
727 | }\r | |
728 | \r | |
729 | /**\r | |
730 | Process the received TCP segments.\r | |
731 | \r | |
732 | @param[in] Nbuf Buffer that contains received a TCP segment without an IP header.\r | |
733 | @param[in] Src Source address of the segment, or the peer's IP address.\r | |
734 | @param[in] Dst Destination address of the segment, or the local end's IP\r | |
735 | address.\r | |
736 | @param[in] Version IP_VERSION_4 indicates IP4 stack. IP_VERSION_6 indicates\r | |
737 | IP6 stack.\r | |
738 | \r | |
739 | @retval 0 Segment processed successfully. It is either accepted or\r | |
740 | discarded. However, no connection is reset by the segment.\r | |
741 | @retval -1 A connection is reset by the segment.\r | |
742 | \r | |
743 | **/\r | |
744 | INTN\r | |
745 | TcpInput (\r | |
746 | IN NET_BUF *Nbuf,\r | |
747 | IN EFI_IP_ADDRESS *Src,\r | |
748 | IN EFI_IP_ADDRESS *Dst,\r | |
749 | IN UINT8 Version\r | |
750 | )\r | |
751 | {\r | |
752 | TCP_CB *Tcb;\r | |
753 | TCP_CB *Parent;\r | |
754 | TCP_OPTION Option;\r | |
755 | TCP_HEAD *Head;\r | |
756 | INT32 Len;\r | |
757 | TCP_SEG *Seg;\r | |
758 | TCP_SEQNO Right;\r | |
759 | TCP_SEQNO Urg;\r | |
760 | UINT16 Checksum;\r | |
761 | INT32 Usable;\r | |
762 | \r | |
763 | ASSERT ((Version == IP_VERSION_4) || (Version == IP_VERSION_6));\r | |
764 | \r | |
765 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
766 | \r | |
767 | Parent = NULL;\r | |
768 | Tcb = NULL;\r | |
769 | \r | |
770 | Head = (TCP_HEAD *) NetbufGetByte (Nbuf, 0, NULL);\r | |
771 | ASSERT (Head != NULL);\r | |
772 | \r | |
773 | if (Nbuf->TotalSize < sizeof (TCP_HEAD)) {\r | |
774 | DEBUG ((EFI_D_NET, "TcpInput: received a malformed packet\n"));\r | |
775 | goto DISCARD;\r | |
776 | }\r | |
777 | \r | |
778 | Len = Nbuf->TotalSize - (Head->HeadLen << 2);\r | |
779 | \r | |
780 | if ((Head->HeadLen < 5) || (Len < 0)) {\r | |
781 | \r | |
782 | DEBUG ((EFI_D_NET, "TcpInput: received a malformed packet\n"));\r | |
783 | \r | |
784 | goto DISCARD;\r | |
785 | }\r | |
786 | \r | |
787 | if (Version == IP_VERSION_4) {\r | |
788 | Checksum = NetPseudoHeadChecksum (Src->Addr[0], Dst->Addr[0], 6, 0);\r | |
789 | } else {\r | |
790 | Checksum = NetIp6PseudoHeadChecksum (&Src->v6, &Dst->v6, 6, 0);\r | |
791 | }\r | |
792 | \r | |
793 | Checksum = TcpChecksum (Nbuf, Checksum);\r | |
794 | \r | |
795 | if (Checksum != 0) {\r | |
796 | DEBUG ((EFI_D_ERROR, "TcpInput: received a checksum error packet\n"));\r | |
797 | goto DISCARD;\r | |
798 | }\r | |
799 | \r | |
800 | if (TCP_FLG_ON (Head->Flag, TCP_FLG_SYN)) {\r | |
801 | Len++;\r | |
802 | }\r | |
803 | \r | |
804 | if (TCP_FLG_ON (Head->Flag, TCP_FLG_FIN)) {\r | |
805 | Len++;\r | |
806 | }\r | |
807 | \r | |
808 | Tcb = TcpLocateTcb (\r | |
809 | Head->DstPort,\r | |
810 | Dst,\r | |
811 | Head->SrcPort,\r | |
812 | Src,\r | |
813 | Version,\r | |
814 | (BOOLEAN) TCP_FLG_ON (Head->Flag, TCP_FLG_SYN)\r | |
815 | );\r | |
816 | \r | |
817 | if ((Tcb == NULL) || (Tcb->State == TCP_CLOSED)) {\r | |
818 | DEBUG ((EFI_D_NET, "TcpInput: send reset because no TCB found\n"));\r | |
819 | \r | |
820 | Tcb = NULL;\r | |
821 | goto SEND_RESET;\r | |
822 | }\r | |
823 | \r | |
824 | Seg = TcpFormatNetbuf (Tcb, Nbuf);\r | |
825 | \r | |
826 | //\r | |
827 | // RFC1122 recommended reaction to illegal option\r | |
828 | // (in fact, an illegal option length) is reset.\r | |
829 | //\r | |
830 | if (TcpParseOption (Nbuf->Tcp, &Option) == -1) {\r | |
831 | DEBUG (\r | |
832 | (EFI_D_ERROR,\r | |
833 | "TcpInput: reset the peer because of malformed option for TCB %p\n",\r | |
834 | Tcb)\r | |
835 | );\r | |
836 | \r | |
837 | goto SEND_RESET;\r | |
838 | }\r | |
839 | \r | |
840 | //\r | |
841 | // From now on, the segment is headless\r | |
842 | //\r | |
843 | NetbufTrim (Nbuf, (Head->HeadLen << 2), NET_BUF_HEAD);\r | |
844 | Nbuf->Tcp = NULL;\r | |
845 | \r | |
846 | //\r | |
847 | // Process the segment in LISTEN state.\r | |
848 | //\r | |
849 | if (Tcb->State == TCP_LISTEN) {\r | |
850 | //\r | |
851 | // First step: Check RST\r | |
852 | //\r | |
853 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
854 | DEBUG (\r | |
855 | (EFI_D_WARN,\r | |
856 | "TcpInput: discard a reset segment for TCB %p in listening\n",\r | |
857 | Tcb)\r | |
858 | );\r | |
859 | \r | |
860 | goto DISCARD;\r | |
861 | }\r | |
862 | \r | |
863 | //\r | |
864 | // Second step: Check ACK.\r | |
865 | // Any ACK sent to TCP in LISTEN is reseted.\r | |
866 | //\r | |
867 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
868 | DEBUG (\r | |
869 | (EFI_D_WARN,\r | |
870 | "TcpInput: send reset because of segment with ACK for TCB %p in listening\n",\r | |
871 | Tcb)\r | |
872 | );\r | |
873 | \r | |
874 | goto SEND_RESET;\r | |
875 | }\r | |
876 | \r | |
877 | //\r | |
878 | // Third step: Check SYN\r | |
879 | //\r | |
880 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
881 | //\r | |
882 | // create a child TCB to handle the data\r | |
883 | //\r | |
884 | Parent = Tcb;\r | |
885 | \r | |
886 | Tcb = TcpCloneTcb (Parent);\r | |
887 | if (Tcb == NULL) {\r | |
888 | DEBUG (\r | |
889 | (EFI_D_ERROR,\r | |
890 | "TcpInput: discard a segment because failed to clone a child for TCB %p\n",\r | |
891 | Tcb)\r | |
892 | );\r | |
893 | \r | |
894 | goto DISCARD;\r | |
895 | }\r | |
896 | \r | |
897 | DEBUG (\r | |
898 | (EFI_D_NET,\r | |
899 | "TcpInput: create a child for TCB %p in listening\n",\r | |
900 | Tcb)\r | |
901 | );\r | |
902 | \r | |
903 | //\r | |
904 | // init the TCB structure\r | |
905 | //\r | |
906 | IP6_COPY_ADDRESS (&Tcb->LocalEnd.Ip, Dst);\r | |
907 | IP6_COPY_ADDRESS (&Tcb->RemoteEnd.Ip, Src);\r | |
908 | Tcb->LocalEnd.Port = Head->DstPort;\r | |
909 | Tcb->RemoteEnd.Port = Head->SrcPort;\r | |
910 | \r | |
911 | TcpInitTcbLocal (Tcb);\r | |
912 | TcpInitTcbPeer (Tcb, Seg, &Option);\r | |
913 | \r | |
914 | TcpSetState (Tcb, TCP_SYN_RCVD);\r | |
915 | TcpSetTimer (Tcb, TCP_TIMER_CONNECT, Tcb->ConnectTimeout);\r | |
916 | if (TcpTrimInWnd (Tcb, Nbuf) == 0) {\r | |
917 | DEBUG (\r | |
918 | (EFI_D_ERROR,\r | |
919 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
920 | Tcb)\r | |
921 | );\r | |
922 | \r | |
923 | goto DISCARD;\r | |
924 | }\r | |
925 | \r | |
926 | goto StepSix;\r | |
927 | }\r | |
928 | \r | |
929 | goto DISCARD;\r | |
930 | \r | |
931 | } else if (Tcb->State == TCP_SYN_SENT) {\r | |
932 | //\r | |
933 | // First step: Check ACK bit\r | |
934 | //\r | |
935 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK) && (Seg->Ack != Tcb->Iss + 1)) {\r | |
936 | \r | |
937 | DEBUG (\r | |
938 | (EFI_D_WARN,\r | |
939 | "TcpInput: send reset because of wrong ACK received for TCB %p in SYN_SENT\n",\r | |
940 | Tcb)\r | |
941 | );\r | |
942 | \r | |
943 | goto SEND_RESET;\r | |
944 | }\r | |
945 | \r | |
946 | //\r | |
947 | // Second step: Check RST bit\r | |
948 | //\r | |
949 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
950 | \r | |
951 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
952 | \r | |
953 | DEBUG (\r | |
954 | (EFI_D_WARN,\r | |
955 | "TcpInput: connection reset by peer for TCB %p in SYN_SENT\n",\r | |
956 | Tcb)\r | |
957 | );\r | |
958 | \r | |
959 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_RESET);\r | |
960 | goto DROP_CONNECTION;\r | |
961 | } else {\r | |
962 | \r | |
963 | DEBUG (\r | |
964 | (EFI_D_WARN,\r | |
965 | "TcpInput: discard a reset segment because of no ACK for TCB %p in SYN_SENT\n",\r | |
966 | Tcb)\r | |
967 | );\r | |
968 | \r | |
969 | goto DISCARD;\r | |
970 | }\r | |
971 | }\r | |
972 | \r | |
973 | //\r | |
974 | // Third step: Check security and precedence. Skipped\r | |
975 | //\r | |
976 | \r | |
977 | //\r | |
978 | // Fourth step: Check SYN. Pay attention to simultaneous open\r | |
979 | //\r | |
980 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
981 | \r | |
982 | TcpInitTcbPeer (Tcb, Seg, &Option);\r | |
983 | \r | |
984 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
985 | \r | |
986 | Tcb->SndUna = Seg->Ack;\r | |
987 | }\r | |
988 | \r | |
989 | TcpClearTimer (Tcb, TCP_TIMER_REXMIT);\r | |
990 | \r | |
991 | if (TCP_SEQ_GT (Tcb->SndUna, Tcb->Iss)) {\r | |
992 | \r | |
993 | TcpSetState (Tcb, TCP_ESTABLISHED);\r | |
994 | \r | |
995 | TcpClearTimer (Tcb, TCP_TIMER_CONNECT);\r | |
996 | TcpDeliverData (Tcb);\r | |
997 | \r | |
998 | if ((Tcb->CongestState == TCP_CONGEST_OPEN) &&\r | |
999 | TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RTT_ON))\r | |
1000 | {\r | |
1001 | \r | |
1002 | TcpComputeRtt (Tcb, Tcb->RttMeasure);\r | |
1003 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
1004 | }\r | |
1005 | \r | |
1006 | if (TcpTrimInWnd (Tcb, Nbuf) == 0) {\r | |
1007 | DEBUG (\r | |
1008 | (EFI_D_ERROR,\r | |
1009 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1010 | Tcb)\r | |
1011 | );\r | |
1012 | \r | |
1013 | goto DISCARD;\r | |
1014 | }\r | |
1015 | \r | |
1016 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
1017 | \r | |
1018 | DEBUG (\r | |
1019 | (EFI_D_NET,\r | |
1020 | "TcpInput: connection established for TCB %p in SYN_SENT\n",\r | |
1021 | Tcb)\r | |
1022 | );\r | |
1023 | \r | |
1024 | goto StepSix;\r | |
1025 | } else {\r | |
1026 | //\r | |
1027 | // Received a SYN segment without ACK, simultaneous open.\r | |
1028 | //\r | |
1029 | TcpSetState (Tcb, TCP_SYN_RCVD);\r | |
1030 | \r | |
1031 | ASSERT (Tcb->SndNxt == Tcb->Iss + 1);\r | |
1032 | \r | |
1033 | if (TcpAdjustSndQue (Tcb, Tcb->SndNxt) == 0 || TcpTrimInWnd (Tcb, Nbuf) == 0) {\r | |
1034 | DEBUG (\r | |
1035 | (EFI_D_ERROR,\r | |
1036 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1037 | Tcb)\r | |
1038 | );\r | |
1039 | \r | |
1040 | goto DISCARD;\r | |
1041 | }\r | |
1042 | \r | |
1043 | DEBUG (\r | |
1044 | (EFI_D_WARN,\r | |
1045 | "TcpInput: simultaneous open for TCB %p in SYN_SENT\n",\r | |
1046 | Tcb)\r | |
1047 | );\r | |
1048 | \r | |
1049 | goto StepSix;\r | |
1050 | }\r | |
1051 | }\r | |
1052 | \r | |
1053 | goto DISCARD;\r | |
1054 | }\r | |
1055 | \r | |
1056 | //\r | |
1057 | // Process segment in SYN_RCVD or TCP_CONNECTED states\r | |
1058 | //\r | |
1059 | \r | |
1060 | //\r | |
1061 | // Clear probe timer since the RecvWindow is opened.\r | |
1062 | //\r | |
1063 | if (Tcb->ProbeTimerOn && (Seg->Wnd != 0)) {\r | |
1064 | TcpClearTimer (Tcb, TCP_TIMER_PROBE);\r | |
1065 | Tcb->ProbeTimerOn = FALSE;\r | |
1066 | }\r | |
1067 | \r | |
1068 | //\r | |
1069 | // First step: Check whether SEG.SEQ is acceptable\r | |
1070 | //\r | |
1071 | if (TcpSeqAcceptable (Tcb, Seg) == 0) {\r | |
1072 | DEBUG (\r | |
1073 | (EFI_D_WARN,\r | |
1074 | "TcpInput: sequence acceptance test failed for segment of TCB %p\n",\r | |
1075 | Tcb)\r | |
1076 | );\r | |
1077 | \r | |
1078 | if (!TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
1079 | TcpSendAck (Tcb);\r | |
1080 | }\r | |
1081 | \r | |
1082 | goto DISCARD;\r | |
1083 | }\r | |
1084 | \r | |
1085 | if ((TCP_SEQ_LT (Seg->Seq, Tcb->RcvWl2)) &&\r | |
1086 | (Tcb->RcvWl2 == Seg->End) &&\r | |
1087 | !TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN | TCP_FLG_FIN))\r | |
1088 | {\r | |
1089 | \r | |
1090 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
1091 | }\r | |
1092 | \r | |
1093 | //\r | |
1094 | // Second step: Check the RST\r | |
1095 | //\r | |
1096 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
1097 | \r | |
1098 | DEBUG ((EFI_D_WARN, "TcpInput: connection reset for TCB %p\n", Tcb));\r | |
1099 | \r | |
1100 | if (Tcb->State == TCP_SYN_RCVD) {\r | |
1101 | \r | |
1102 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_REFUSED);\r | |
1103 | \r | |
1104 | //\r | |
1105 | // This TCB comes from either a LISTEN TCB,\r | |
1106 | // or active open TCB with simultaneous open.\r | |
1107 | // Do NOT signal user CONNECTION refused\r | |
1108 | // if it comes from a LISTEN TCB.\r | |
1109 | //\r | |
1110 | } else if ((Tcb->State == TCP_ESTABLISHED) ||\r | |
1111 | (Tcb->State == TCP_FIN_WAIT_1) ||\r | |
1112 | (Tcb->State == TCP_FIN_WAIT_2) ||\r | |
1113 | (Tcb->State == TCP_CLOSE_WAIT))\r | |
1114 | {\r | |
1115 | \r | |
1116 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_RESET);\r | |
1117 | \r | |
1118 | } else {\r | |
1119 | }\r | |
1120 | \r | |
1121 | goto DROP_CONNECTION;\r | |
1122 | }\r | |
1123 | \r | |
1124 | //\r | |
1125 | // Trim the data and flags.\r | |
1126 | //\r | |
1127 | if (TcpTrimInWnd (Tcb, Nbuf) == 0) {\r | |
1128 | DEBUG (\r | |
1129 | (EFI_D_ERROR,\r | |
1130 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1131 | Tcb)\r | |
1132 | );\r | |
1133 | \r | |
1134 | goto DISCARD;\r | |
1135 | }\r | |
1136 | \r | |
1137 | //\r | |
1138 | // Third step: Check security and precedence, Ignored\r | |
1139 | //\r | |
1140 | \r | |
1141 | //\r | |
1142 | // Fourth step: Check the SYN bit.\r | |
1143 | //\r | |
1144 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
1145 | \r | |
1146 | DEBUG (\r | |
1147 | (EFI_D_WARN,\r | |
1148 | "TcpInput: connection reset because received extra SYN for TCB %p\n",\r | |
1149 | Tcb)\r | |
1150 | );\r | |
1151 | \r | |
1152 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_RESET);\r | |
1153 | goto RESET_THEN_DROP;\r | |
1154 | }\r | |
1155 | //\r | |
1156 | // Fifth step: Check the ACK\r | |
1157 | //\r | |
1158 | if (!TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
1159 | DEBUG (\r | |
1160 | (EFI_D_WARN,\r | |
1161 | "TcpInput: segment discard because of no ACK for connected TCB %p\n",\r | |
1162 | Tcb)\r | |
1163 | );\r | |
1164 | \r | |
1165 | goto DISCARD;\r | |
1166 | } else {\r | |
1167 | if (Tcb->IpInfo->IpVersion == IP_VERSION_6 && Tcb->Tick == 0) {\r | |
1168 | Tcp6RefreshNeighbor (Tcb, Src, TCP6_KEEP_NEIGHBOR_TIME * TICKS_PER_SECOND);\r | |
1169 | Tcb->Tick = TCP6_REFRESH_NEIGHBOR_TICK;\r | |
1170 | }\r | |
1171 | }\r | |
1172 | \r | |
1173 | if (Tcb->State == TCP_SYN_RCVD) {\r | |
1174 | \r | |
1175 | if (TCP_SEQ_LT (Tcb->SndUna, Seg->Ack) &&\r | |
1176 | TCP_SEQ_LEQ (Seg->Ack, Tcb->SndNxt))\r | |
1177 | {\r | |
1178 | \r | |
1179 | Tcb->SndWnd = Seg->Wnd;\r | |
1180 | Tcb->SndWndMax = MAX (Tcb->SndWnd, Tcb->SndWndMax);\r | |
1181 | Tcb->SndWl1 = Seg->Seq;\r | |
1182 | Tcb->SndWl2 = Seg->Ack;\r | |
1183 | TcpSetState (Tcb, TCP_ESTABLISHED);\r | |
1184 | \r | |
1185 | TcpClearTimer (Tcb, TCP_TIMER_CONNECT);\r | |
1186 | TcpDeliverData (Tcb);\r | |
1187 | \r | |
1188 | DEBUG (\r | |
1189 | (EFI_D_NET,\r | |
1190 | "TcpInput: connection established for TCB %p in SYN_RCVD\n",\r | |
1191 | Tcb)\r | |
1192 | );\r | |
1193 | \r | |
1194 | //\r | |
1195 | // Continue the process as ESTABLISHED state\r | |
1196 | //\r | |
1197 | } else {\r | |
1198 | DEBUG (\r | |
1199 | (EFI_D_WARN,\r | |
1200 | "TcpInput: send reset because of wrong ACK for TCB %p in SYN_RCVD\n",\r | |
1201 | Tcb)\r | |
1202 | );\r | |
1203 | \r | |
1204 | goto SEND_RESET;\r | |
1205 | }\r | |
1206 | }\r | |
1207 | \r | |
1208 | if (TCP_SEQ_LT (Seg->Ack, Tcb->SndUna)) {\r | |
1209 | \r | |
1210 | DEBUG (\r | |
1211 | (EFI_D_WARN,\r | |
1212 | "TcpInput: ignore the out-of-data ACK for connected TCB %p\n",\r | |
1213 | Tcb)\r | |
1214 | );\r | |
1215 | \r | |
1216 | goto StepSix;\r | |
1217 | \r | |
1218 | } else if (TCP_SEQ_GT (Seg->Ack, Tcb->SndNxt)) {\r | |
1219 | \r | |
1220 | DEBUG (\r | |
1221 | (EFI_D_WARN,\r | |
1222 | "TcpInput: discard segment for future ACK for connected TCB %p\n",\r | |
1223 | Tcb)\r | |
1224 | );\r | |
1225 | \r | |
1226 | TcpSendAck (Tcb);\r | |
1227 | goto DISCARD;\r | |
1228 | }\r | |
1229 | \r | |
1230 | //\r | |
1231 | // From now on: SND.UNA <= SEG.ACK <= SND.NXT.\r | |
1232 | //\r | |
1233 | if (TCP_FLG_ON (Option.Flag, TCP_OPTION_RCVD_TS)) {\r | |
1234 | //\r | |
1235 | // update TsRecent as specified in page 16 RFC1323.\r | |
1236 | // RcvWl2 equals to the variable "LastAckSent"\r | |
1237 | // defined there.\r | |
1238 | //\r | |
1239 | if (TCP_SEQ_LEQ (Seg->Seq, Tcb->RcvWl2) &&\r | |
1240 | TCP_SEQ_LT (Tcb->RcvWl2, Seg->End))\r | |
1241 | {\r | |
1242 | \r | |
1243 | Tcb->TsRecent = Option.TSVal;\r | |
1244 | Tcb->TsRecentAge = mTcpTick;\r | |
1245 | }\r | |
1246 | \r | |
1247 | TcpComputeRtt (Tcb, TCP_SUB_TIME (mTcpTick, Option.TSEcr));\r | |
1248 | \r | |
1249 | } else if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RTT_ON)) {\r | |
1250 | \r | |
1251 | ASSERT (Tcb->CongestState == TCP_CONGEST_OPEN);\r | |
1252 | \r | |
1253 | TcpComputeRtt (Tcb, Tcb->RttMeasure);\r | |
1254 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
1255 | }\r | |
1256 | \r | |
1257 | if (Seg->Ack == Tcb->SndNxt) {\r | |
1258 | \r | |
1259 | TcpClearTimer (Tcb, TCP_TIMER_REXMIT);\r | |
1260 | } else {\r | |
1261 | \r | |
1262 | TcpSetTimer (Tcb, TCP_TIMER_REXMIT, Tcb->Rto);\r | |
1263 | }\r | |
1264 | \r | |
1265 | //\r | |
1266 | // Count duplicate acks.\r | |
1267 | //\r | |
1268 | if ((Seg->Ack == Tcb->SndUna) &&\r | |
1269 | (Tcb->SndUna != Tcb->SndNxt) &&\r | |
1270 | (Seg->Wnd == Tcb->SndWnd) &&\r | |
1271 | (0 == Len))\r | |
1272 | {\r | |
1273 | \r | |
1274 | Tcb->DupAck++;\r | |
1275 | } else {\r | |
1276 | \r | |
1277 | Tcb->DupAck = 0;\r | |
1278 | }\r | |
1279 | \r | |
1280 | //\r | |
1281 | // Congestion avoidance, fast recovery and fast retransmission.\r | |
1282 | //\r | |
1283 | if (((Tcb->CongestState == TCP_CONGEST_OPEN) && (Tcb->DupAck < 3)) ||\r | |
1284 | (Tcb->CongestState == TCP_CONGEST_LOSS))\r | |
1285 | {\r | |
1286 | \r | |
1287 | if (TCP_SEQ_GT (Seg->Ack, Tcb->SndUna)) {\r | |
1288 | \r | |
1289 | if (Tcb->CWnd < Tcb->Ssthresh) {\r | |
1290 | \r | |
1291 | Tcb->CWnd += Tcb->SndMss;\r | |
1292 | } else {\r | |
1293 | \r | |
1294 | Tcb->CWnd += MAX (Tcb->SndMss * Tcb->SndMss / Tcb->CWnd, 1);\r | |
1295 | }\r | |
1296 | \r | |
1297 | Tcb->CWnd = MIN (Tcb->CWnd, TCP_MAX_WIN << Tcb->SndWndScale);\r | |
1298 | }\r | |
1299 | \r | |
1300 | if (Tcb->CongestState == TCP_CONGEST_LOSS) {\r | |
1301 | TcpFastLossRecover (Tcb, Seg);\r | |
1302 | }\r | |
1303 | } else {\r | |
1304 | \r | |
1305 | TcpFastRecover (Tcb, Seg);\r | |
1306 | }\r | |
1307 | \r | |
1308 | if (TCP_SEQ_GT (Seg->Ack, Tcb->SndUna)) {\r | |
1309 | \r | |
1310 | if (TcpAdjustSndQue (Tcb, Seg->Ack) == 0) {\r | |
1311 | DEBUG (\r | |
1312 | (EFI_D_ERROR,\r | |
1313 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1314 | Tcb)\r | |
1315 | );\r | |
1316 | \r | |
1317 | goto DISCARD;\r | |
1318 | }\r | |
1319 | \r | |
1320 | Tcb->SndUna = Seg->Ack;\r | |
1321 | \r | |
1322 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_SND_URG) &&\r | |
1323 | TCP_SEQ_LT (Tcb->SndUp, Seg->Ack))\r | |
1324 | {\r | |
1325 | \r | |
1326 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_SND_URG);\r | |
1327 | }\r | |
1328 | }\r | |
1329 | \r | |
1330 | //\r | |
1331 | // Update window info\r | |
1332 | //\r | |
1333 | if (TCP_SEQ_LT (Tcb->SndWl1, Seg->Seq) ||\r | |
1334 | ((Tcb->SndWl1 == Seg->Seq) && TCP_SEQ_LEQ (Tcb->SndWl2, Seg->Ack)))\r | |
1335 | {\r | |
1336 | \r | |
1337 | Right = Seg->Ack + Seg->Wnd;\r | |
1338 | \r | |
1339 | if (TCP_SEQ_LT (Right, Tcb->SndWl2 + Tcb->SndWnd)) {\r | |
1340 | \r | |
1341 | if ((Tcb->SndWl1 == Seg->Seq) &&\r | |
1342 | (Tcb->SndWl2 == Seg->Ack) &&\r | |
1343 | (Len == 0))\r | |
1344 | {\r | |
1345 | \r | |
1346 | goto NO_UPDATE;\r | |
1347 | }\r | |
1348 | \r | |
1349 | DEBUG (\r | |
1350 | (EFI_D_WARN,\r | |
1351 | "TcpInput: peer shrinks the window for connected TCB %p\n",\r | |
1352 | Tcb)\r | |
1353 | );\r | |
1354 | \r | |
1355 | if ((Tcb->CongestState == TCP_CONGEST_RECOVER) &&\r | |
1356 | (TCP_SEQ_LT (Right, Tcb->Recover)))\r | |
1357 | {\r | |
1358 | \r | |
1359 | Tcb->Recover = Right;\r | |
1360 | }\r | |
1361 | \r | |
1362 | if ((Tcb->CongestState == TCP_CONGEST_LOSS) &&\r | |
1363 | (TCP_SEQ_LT (Right, Tcb->LossRecover)))\r | |
1364 | {\r | |
1365 | \r | |
1366 | Tcb->LossRecover = Right;\r | |
1367 | }\r | |
1368 | \r | |
1369 | if (TCP_SEQ_LT (Right, Tcb->SndNxt)) {\r | |
1370 | //\r | |
1371 | // Check for Window Retraction in RFC7923 section 2.4.\r | |
1372 | // The lower n bits of the peer's actual receive window is wiped out if TCP\r | |
1373 | // window scale is enabled, it will look like the peer is shrinking the window.\r | |
1374 | // Check whether the SndNxt is out of the advertised receive window by more than\r | |
1375 | // 2^Rcv.Wind.Shift before moving the SndNxt to the left.\r | |
1376 | //\r | |
1377 | DEBUG (\r | |
1378 | (EFI_D_WARN,\r | |
1379 | "TcpInput: peer advise negative useable window for connected TCB %p\n",\r | |
1380 | Tcb)\r | |
1381 | );\r | |
1382 | Usable = TCP_SUB_SEQ (Tcb->SndNxt, Right);\r | |
1383 | if ((Usable >> Tcb->SndWndScale) > 0) {\r | |
1384 | DEBUG (\r | |
1385 | (EFI_D_WARN,\r | |
1386 | "TcpInput: SndNxt is out of window by more than window scale for TCB %p\n",\r | |
1387 | Tcb)\r | |
1388 | );\r | |
1389 | Tcb->SndNxt = Right;\r | |
1390 | }\r | |
1391 | if (Right == Tcb->SndUna) {\r | |
1392 | \r | |
1393 | TcpClearTimer (Tcb, TCP_TIMER_REXMIT);\r | |
1394 | TcpSetProbeTimer (Tcb);\r | |
1395 | }\r | |
1396 | }\r | |
1397 | }\r | |
1398 | \r | |
1399 | Tcb->SndWnd = Seg->Wnd;\r | |
1400 | Tcb->SndWndMax = MAX (Tcb->SndWnd, Tcb->SndWndMax);\r | |
1401 | Tcb->SndWl1 = Seg->Seq;\r | |
1402 | Tcb->SndWl2 = Seg->Ack;\r | |
1403 | }\r | |
1404 | \r | |
1405 | NO_UPDATE:\r | |
1406 | \r | |
1407 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_SENT) &&\r | |
1408 | (Tcb->SndUna == Tcb->SndNxt))\r | |
1409 | {\r | |
1410 | \r | |
1411 | DEBUG (\r | |
1412 | (EFI_D_NET,\r | |
1413 | "TcpInput: local FIN is ACKed by peer for connected TCB %p\n",\r | |
1414 | Tcb)\r | |
1415 | );\r | |
1416 | \r | |
1417 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED);\r | |
1418 | }\r | |
1419 | \r | |
1420 | //\r | |
1421 | // Transit the state if proper.\r | |
1422 | //\r | |
1423 | switch (Tcb->State) {\r | |
1424 | case TCP_FIN_WAIT_1:\r | |
1425 | \r | |
1426 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
1427 | \r | |
1428 | TcpSetState (Tcb, TCP_FIN_WAIT_2);\r | |
1429 | \r | |
1430 | TcpClearAllTimer (Tcb);\r | |
1431 | TcpSetTimer (Tcb, TCP_TIMER_FINWAIT2, Tcb->FinWait2Timeout);\r | |
1432 | }\r | |
1433 | \r | |
1434 | case TCP_FIN_WAIT_2:\r | |
1435 | \r | |
1436 | break;\r | |
1437 | \r | |
1438 | case TCP_CLOSE_WAIT:\r | |
1439 | break;\r | |
1440 | \r | |
1441 | case TCP_CLOSING:\r | |
1442 | \r | |
1443 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
1444 | \r | |
1445 | TcpSetState (Tcb, TCP_TIME_WAIT);\r | |
1446 | \r | |
1447 | TcpClearAllTimer (Tcb);\r | |
1448 | \r | |
1449 | if (Tcb->TimeWaitTimeout != 0) {\r | |
1450 | \r | |
1451 | TcpSetTimer (Tcb, TCP_TIMER_2MSL, Tcb->TimeWaitTimeout);\r | |
1452 | } else {\r | |
1453 | \r | |
1454 | DEBUG (\r | |
1455 | (EFI_D_WARN,\r | |
1456 | "Connection closed immediately because app disables TIME_WAIT timer for %p\n",\r | |
1457 | Tcb)\r | |
1458 | );\r | |
1459 | \r | |
1460 | TcpClose (Tcb);\r | |
1461 | }\r | |
1462 | }\r | |
1463 | break;\r | |
1464 | \r | |
1465 | case TCP_LAST_ACK:\r | |
1466 | \r | |
1467 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
1468 | \r | |
1469 | TcpSetState (Tcb, TCP_CLOSED);\r | |
1470 | }\r | |
1471 | \r | |
1472 | break;\r | |
1473 | \r | |
1474 | case TCP_TIME_WAIT:\r | |
1475 | \r | |
1476 | TcpSendAck (Tcb);\r | |
1477 | \r | |
1478 | if (Tcb->TimeWaitTimeout != 0) {\r | |
1479 | \r | |
1480 | TcpSetTimer (Tcb, TCP_TIMER_2MSL, Tcb->TimeWaitTimeout);\r | |
1481 | } else {\r | |
1482 | \r | |
1483 | DEBUG (\r | |
1484 | (EFI_D_WARN,\r | |
1485 | "Connection closed immediately because app disables TIME_WAIT timer for %p\n",\r | |
1486 | Tcb)\r | |
1487 | );\r | |
1488 | \r | |
1489 | TcpClose (Tcb);\r | |
1490 | }\r | |
1491 | break;\r | |
1492 | \r | |
1493 | default:\r | |
1494 | break;\r | |
1495 | }\r | |
1496 | //\r | |
1497 | // Sixth step: Check the URG bit.update the Urg point\r | |
1498 | // if in TCP_CAN_RECV, otherwise, leave the RcvUp intact.\r | |
1499 | //\r | |
1500 | StepSix:\r | |
1501 | \r | |
1502 | Tcb->Idle = 0;\r | |
1503 | TcpSetKeepaliveTimer (Tcb);\r | |
1504 | \r | |
1505 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_URG) && !TCP_FIN_RCVD (Tcb->State)) {\r | |
1506 | \r | |
1507 | DEBUG (\r | |
1508 | (EFI_D_NET,\r | |
1509 | "TcpInput: received urgent data from peer for connected TCB %p\n",\r | |
1510 | Tcb)\r | |
1511 | );\r | |
1512 | \r | |
1513 | Urg = Seg->Seq + Seg->Urg;\r | |
1514 | \r | |
1515 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_URG) &&\r | |
1516 | TCP_SEQ_GT (Urg, Tcb->RcvUp))\r | |
1517 | {\r | |
1518 | \r | |
1519 | Tcb->RcvUp = Urg;\r | |
1520 | } else {\r | |
1521 | \r | |
1522 | Tcb->RcvUp = Urg;\r | |
1523 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_RCVD_URG);\r | |
1524 | }\r | |
1525 | }\r | |
1526 | //\r | |
1527 | // Seventh step: Process the segment data\r | |
1528 | //\r | |
1529 | if (Seg->End != Seg->Seq) {\r | |
1530 | \r | |
1531 | if (TCP_FIN_RCVD (Tcb->State)) {\r | |
1532 | \r | |
1533 | DEBUG (\r | |
1534 | (EFI_D_WARN,\r | |
1535 | "TcpInput: connection reset because data is lost for connected TCB %p\n",\r | |
1536 | Tcb)\r | |
1537 | );\r | |
1538 | \r | |
1539 | goto RESET_THEN_DROP;\r | |
1540 | }\r | |
1541 | \r | |
1542 | if (TCP_LOCAL_CLOSED (Tcb->State) && (Nbuf->TotalSize != 0)) {\r | |
1543 | DEBUG (\r | |
1544 | (EFI_D_WARN,\r | |
1545 | "TcpInput: connection reset because data is lost for connected TCB %p\n",\r | |
1546 | Tcb)\r | |
1547 | );\r | |
1548 | \r | |
1549 | goto RESET_THEN_DROP;\r | |
1550 | }\r | |
1551 | \r | |
1552 | if (TcpQueueData (Tcb, Nbuf) == 0) {\r | |
1553 | DEBUG (\r | |
1554 | (EFI_D_ERROR,\r | |
1555 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1556 | Tcb)\r | |
1557 | );\r | |
1558 | \r | |
1559 | goto DISCARD;\r | |
1560 | }\r | |
1561 | \r | |
1562 | if (TcpDeliverData (Tcb) == -1) {\r | |
1563 | goto RESET_THEN_DROP;\r | |
1564 | }\r | |
1565 | \r | |
1566 | if (!IsListEmpty (&Tcb->RcvQue)) {\r | |
1567 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
1568 | }\r | |
1569 | }\r | |
1570 | \r | |
1571 | //\r | |
1572 | // Eighth step: check the FIN.\r | |
1573 | // This step is moved to TcpDeliverData. FIN will be\r | |
1574 | // processed in sequence there. Check the comments in\r | |
1575 | // the beginning of the file header for information.\r | |
1576 | //\r | |
1577 | \r | |
1578 | //\r | |
1579 | // Tcb is a new child of the listening Parent,\r | |
1580 | // commit it.\r | |
1581 | //\r | |
1582 | if (Parent != NULL) {\r | |
1583 | Tcb->Parent = Parent;\r | |
1584 | TcpInsertTcb (Tcb);\r | |
1585 | }\r | |
1586 | \r | |
1587 | if ((Tcb->State != TCP_CLOSED) &&\r | |
1588 | (TcpToSendData (Tcb, 0) == 0) &&\r | |
1589 | (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW) || (Nbuf->TotalSize != 0)))\r | |
1590 | {\r | |
1591 | \r | |
1592 | TcpToSendAck (Tcb);\r | |
1593 | }\r | |
1594 | \r | |
1595 | NetbufFree (Nbuf);\r | |
1596 | return 0;\r | |
1597 | \r | |
1598 | RESET_THEN_DROP:\r | |
1599 | TcpSendReset (Tcb, Head, Len, Dst, Src, Version);\r | |
1600 | \r | |
1601 | DROP_CONNECTION:\r | |
1602 | ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL));\r | |
1603 | \r | |
1604 | NetbufFree (Nbuf);\r | |
1605 | TcpClose (Tcb);\r | |
1606 | \r | |
1607 | return -1;\r | |
1608 | \r | |
1609 | SEND_RESET:\r | |
1610 | \r | |
1611 | TcpSendReset (Tcb, Head, Len, Dst, Src, Version);\r | |
1612 | \r | |
1613 | DISCARD:\r | |
1614 | \r | |
1615 | //\r | |
1616 | // Tcb is a child of Parent, and it doesn't survive\r | |
1617 | //\r | |
1618 | DEBUG ((EFI_D_WARN, "TcpInput: Discard a packet\n"));\r | |
1619 | NetbufFree (Nbuf);\r | |
1620 | \r | |
1621 | if ((Parent != NULL) && (Tcb != NULL)) {\r | |
1622 | \r | |
1623 | ASSERT (Tcb->Sk != NULL);\r | |
1624 | TcpClose (Tcb);\r | |
1625 | }\r | |
1626 | \r | |
1627 | return 0;\r | |
1628 | }\r | |
1629 | \r | |
1630 | /**\r | |
1631 | Process the received ICMP error messages for TCP.\r | |
1632 | \r | |
1633 | @param[in] Nbuf The buffer that contains part of the TCP segment without an IP header\r | |
1634 | truncated from the ICMP error packet.\r | |
1635 | @param[in] IcmpErr The ICMP error code interpreted from an ICMP error packet.\r | |
1636 | @param[in] Src Source address of the ICMP error message.\r | |
1637 | @param[in] Dst Destination address of the ICMP error message.\r | |
1638 | @param[in] Version IP_VERSION_4 indicates IP4 stack. IP_VERSION_6 indicates\r | |
1639 | IP6 stack.\r | |
1640 | \r | |
1641 | **/\r | |
1642 | VOID\r | |
1643 | TcpIcmpInput (\r | |
1644 | IN NET_BUF *Nbuf,\r | |
1645 | IN UINT8 IcmpErr,\r | |
1646 | IN EFI_IP_ADDRESS *Src,\r | |
1647 | IN EFI_IP_ADDRESS *Dst,\r | |
1648 | IN UINT8 Version\r | |
1649 | )\r | |
1650 | {\r | |
1651 | TCP_HEAD *Head;\r | |
1652 | TCP_CB *Tcb;\r | |
1653 | TCP_SEQNO Seq;\r | |
1654 | EFI_STATUS IcmpErrStatus;\r | |
1655 | BOOLEAN IcmpErrIsHard;\r | |
1656 | BOOLEAN IcmpErrNotify;\r | |
1657 | \r | |
1658 | if (Nbuf->TotalSize < sizeof (TCP_HEAD)) {\r | |
1659 | goto CLEAN_EXIT;\r | |
1660 | }\r | |
1661 | \r | |
1662 | Head = (TCP_HEAD *) NetbufGetByte (Nbuf, 0, NULL);\r | |
1663 | ASSERT (Head != NULL);\r | |
1664 | \r | |
1665 | Tcb = TcpLocateTcb (\r | |
1666 | Head->DstPort,\r | |
1667 | Dst,\r | |
1668 | Head->SrcPort,\r | |
1669 | Src,\r | |
1670 | Version,\r | |
1671 | FALSE\r | |
1672 | );\r | |
1673 | if (Tcb == NULL || Tcb->State == TCP_CLOSED) {\r | |
1674 | \r | |
1675 | goto CLEAN_EXIT;\r | |
1676 | }\r | |
1677 | \r | |
1678 | //\r | |
1679 | // Validate the sequence number.\r | |
1680 | //\r | |
1681 | Seq = NTOHL (Head->Seq);\r | |
1682 | if (!(TCP_SEQ_LEQ (Tcb->SndUna, Seq) && TCP_SEQ_LT (Seq, Tcb->SndNxt))) {\r | |
1683 | \r | |
1684 | goto CLEAN_EXIT;\r | |
1685 | }\r | |
1686 | \r | |
1687 | IcmpErrStatus = IpIoGetIcmpErrStatus (\r | |
1688 | IcmpErr,\r | |
1689 | Tcb->Sk->IpVersion,\r | |
1690 | &IcmpErrIsHard,\r | |
1691 | &IcmpErrNotify\r | |
1692 | );\r | |
1693 | \r | |
1694 | if (IcmpErrNotify) {\r | |
1695 | \r | |
1696 | SOCK_ERROR (Tcb->Sk, IcmpErrStatus);\r | |
1697 | }\r | |
1698 | \r | |
1699 | if (IcmpErrIsHard) {\r | |
1700 | \r | |
1701 | TcpClose (Tcb);\r | |
1702 | }\r | |
1703 | \r | |
1704 | CLEAN_EXIT:\r | |
1705 | \r | |
1706 | NetbufFree (Nbuf);\r | |
1707 | }\r |