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a3bcde70 HT |
1 | /** @file\r |
2 | TCP input process routines.\r | |
3 | \r | |
f75a7f56 | 4 | Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r |
a3bcde70 HT |
5 | \r |
6 | This program and the accompanying materials\r | |
7 | are licensed and made available under the terms and conditions of the BSD License\r | |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php.\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | #include "TcpMain.h"\r | |
17 | \r | |
18 | /**\r | |
19 | Check whether the sequence number of the incoming segment is acceptable.\r | |
20 | \r | |
21 | @param[in] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
22 | @param[in] Seg Pointer to the incoming segment.\r | |
23 | \r | |
24 | @retval 1 The sequence number is acceptable.\r | |
25 | @retval 0 The sequence number is not acceptable.\r | |
26 | \r | |
27 | **/\r | |
28 | INTN\r | |
29 | TcpSeqAcceptable (\r | |
30 | IN TCP_CB *Tcb,\r | |
31 | IN TCP_SEG *Seg\r | |
32 | )\r | |
33 | {\r | |
09c25d1f | 34 | return (TCP_SEQ_LEQ (Tcb->RcvNxt, Seg->End) &&\r |
a3bcde70 HT |
35 | TCP_SEQ_LT (Seg->Seq, Tcb->RcvWl2 + Tcb->RcvWnd));\r |
36 | }\r | |
37 | \r | |
38 | /**\r | |
39 | NewReno fast recovery defined in RFC3782.\r | |
40 | \r | |
41 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
42 | @param[in] Seg Segment that triggers the fast recovery.\r | |
43 | \r | |
44 | **/\r | |
45 | VOID\r | |
46 | TcpFastRecover (\r | |
47 | IN OUT TCP_CB *Tcb,\r | |
48 | IN TCP_SEG *Seg\r | |
49 | )\r | |
50 | {\r | |
51 | UINT32 FlightSize;\r | |
52 | UINT32 Acked;\r | |
53 | \r | |
54 | //\r | |
55 | // Step 1: Three duplicate ACKs and not in fast recovery\r | |
56 | //\r | |
57 | if (Tcb->CongestState != TCP_CONGEST_RECOVER) {\r | |
58 | \r | |
59 | //\r | |
60 | // Step 1A: Invoking fast retransmission.\r | |
61 | //\r | |
62 | FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);\r | |
63 | \r | |
64 | Tcb->Ssthresh = MAX (FlightSize >> 1, (UINT32) (2 * Tcb->SndMss));\r | |
65 | Tcb->Recover = Tcb->SndNxt;\r | |
66 | \r | |
67 | Tcb->CongestState = TCP_CONGEST_RECOVER;\r | |
68 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
69 | \r | |
70 | //\r | |
71 | // Step 2: Entering fast retransmission\r | |
72 | //\r | |
73 | TcpRetransmit (Tcb, Tcb->SndUna);\r | |
74 | Tcb->CWnd = Tcb->Ssthresh + 3 * Tcb->SndMss;\r | |
75 | \r | |
76 | DEBUG (\r | |
f3612a8d | 77 | (EFI_D_NET,\r |
a3bcde70 HT |
78 | "TcpFastRecover: enter fast retransmission for TCB %p, recover point is %d\n",\r |
79 | Tcb,\r | |
80 | Tcb->Recover)\r | |
81 | );\r | |
82 | return;\r | |
83 | }\r | |
84 | \r | |
85 | //\r | |
86 | // During fast recovery, execute Step 3, 4, 5 of RFC3782\r | |
87 | //\r | |
88 | if (Seg->Ack == Tcb->SndUna) {\r | |
89 | \r | |
90 | //\r | |
91 | // Step 3: Fast Recovery,\r | |
92 | // If this is a duplicated ACK, increse Cwnd by SMSS.\r | |
93 | //\r | |
94 | \r | |
95 | // Step 4 is skipped here only to be executed later\r | |
96 | // by TcpToSendData\r | |
97 | //\r | |
98 | Tcb->CWnd += Tcb->SndMss;\r | |
99 | DEBUG (\r | |
f3612a8d | 100 | (EFI_D_NET,\r |
a3bcde70 HT |
101 | "TcpFastRecover: received another duplicated ACK (%d) for TCB %p\n",\r |
102 | Seg->Ack,\r | |
103 | Tcb)\r | |
104 | );\r | |
105 | \r | |
106 | } else {\r | |
107 | \r | |
108 | //\r | |
109 | // New data is ACKed, check whether it is a\r | |
110 | // full ACK or partial ACK\r | |
111 | //\r | |
112 | if (TCP_SEQ_GEQ (Seg->Ack, Tcb->Recover)) {\r | |
113 | \r | |
114 | //\r | |
115 | // Step 5 - Full ACK:\r | |
116 | // deflate the congestion window, and exit fast recovery\r | |
117 | //\r | |
118 | FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);\r | |
119 | \r | |
120 | Tcb->CWnd = MIN (Tcb->Ssthresh, FlightSize + Tcb->SndMss);\r | |
121 | \r | |
122 | Tcb->CongestState = TCP_CONGEST_OPEN;\r | |
123 | DEBUG (\r | |
f3612a8d | 124 | (EFI_D_NET,\r |
a3bcde70 HT |
125 | "TcpFastRecover: received a full ACK(%d) for TCB %p, exit fast recovery\n",\r |
126 | Seg->Ack,\r | |
127 | Tcb)\r | |
128 | );\r | |
129 | \r | |
130 | } else {\r | |
131 | \r | |
132 | //\r | |
133 | // Step 5 - Partial ACK:\r | |
134 | // fast retransmit the first unacknowledge field\r | |
135 | // , then deflate the CWnd\r | |
136 | //\r | |
137 | TcpRetransmit (Tcb, Seg->Ack);\r | |
138 | Acked = TCP_SUB_SEQ (Seg->Ack, Tcb->SndUna);\r | |
139 | \r | |
140 | //\r | |
141 | // Deflate the CWnd by the amount of new data\r | |
142 | // ACKed by SEG.ACK. If more than one SMSS data\r | |
143 | // is ACKed, add back SMSS byte to CWnd after\r | |
144 | //\r | |
145 | if (Acked >= Tcb->SndMss) {\r | |
146 | Acked -= Tcb->SndMss;\r | |
147 | \r | |
148 | }\r | |
149 | \r | |
150 | Tcb->CWnd -= Acked;\r | |
151 | \r | |
152 | DEBUG (\r | |
f3612a8d | 153 | (EFI_D_NET,\r |
a3bcde70 HT |
154 | "TcpFastRecover: received a partial ACK(%d) for TCB %p\n",\r |
155 | Seg->Ack,\r | |
156 | Tcb)\r | |
157 | );\r | |
158 | \r | |
159 | }\r | |
160 | }\r | |
161 | }\r | |
162 | \r | |
163 | /**\r | |
164 | NewReno fast loss recovery defined in RFC3792.\r | |
165 | \r | |
166 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
167 | @param[in] Seg Segment that triggers the fast loss recovery.\r | |
168 | \r | |
169 | **/\r | |
170 | VOID\r | |
171 | TcpFastLossRecover (\r | |
172 | IN OUT TCP_CB *Tcb,\r | |
173 | IN TCP_SEG *Seg\r | |
174 | )\r | |
175 | {\r | |
176 | if (TCP_SEQ_GT (Seg->Ack, Tcb->SndUna)) {\r | |
177 | \r | |
178 | //\r | |
179 | // New data is ACKed, check whether it is a\r | |
180 | // full ACK or partial ACK\r | |
181 | //\r | |
182 | if (TCP_SEQ_GEQ (Seg->Ack, Tcb->LossRecover)) {\r | |
183 | \r | |
184 | //\r | |
185 | // Full ACK: exit the loss recovery.\r | |
186 | //\r | |
187 | Tcb->LossTimes = 0;\r | |
188 | Tcb->CongestState = TCP_CONGEST_OPEN;\r | |
189 | \r | |
190 | DEBUG (\r | |
f3612a8d | 191 | (EFI_D_NET,\r |
a3bcde70 HT |
192 | "TcpFastLossRecover: received a full ACK(%d) for TCB %p\n",\r |
193 | Seg->Ack,\r | |
194 | Tcb)\r | |
195 | );\r | |
196 | \r | |
197 | } else {\r | |
198 | \r | |
199 | //\r | |
200 | // Partial ACK:\r | |
201 | // fast retransmit the first unacknowledge field.\r | |
202 | //\r | |
203 | TcpRetransmit (Tcb, Seg->Ack);\r | |
204 | DEBUG (\r | |
f3612a8d | 205 | (EFI_D_NET,\r |
a3bcde70 HT |
206 | "TcpFastLossRecover: received a partial ACK(%d) for TCB %p\n",\r |
207 | Seg->Ack,\r | |
208 | Tcb)\r | |
209 | );\r | |
210 | }\r | |
211 | }\r | |
212 | }\r | |
213 | \r | |
214 | /**\r | |
215 | Compute the RTT as specified in RFC2988.\r | |
216 | \r | |
217 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
218 | @param[in] Measure Currently measured RTT in heartbeats.\r | |
219 | \r | |
220 | **/\r | |
221 | VOID\r | |
222 | TcpComputeRtt (\r | |
223 | IN OUT TCP_CB *Tcb,\r | |
224 | IN UINT32 Measure\r | |
225 | )\r | |
226 | {\r | |
227 | INT32 Var;\r | |
228 | \r | |
229 | //\r | |
230 | // Step 2.3: Compute the RTO for subsequent RTT measurement.\r | |
231 | //\r | |
232 | if (Tcb->SRtt != 0) {\r | |
233 | \r | |
234 | Var = Tcb->SRtt - (Measure << TCP_RTT_SHIFT);\r | |
235 | \r | |
236 | if (Var < 0) {\r | |
237 | Var = -Var;\r | |
238 | }\r | |
239 | \r | |
240 | Tcb->RttVar = (3 * Tcb->RttVar + Var) >> 2;\r | |
241 | Tcb->SRtt = 7 * (Tcb->SRtt >> 3) + Measure;\r | |
242 | \r | |
243 | } else {\r | |
244 | //\r | |
245 | // Step 2.2: compute the first RTT measure\r | |
246 | //\r | |
247 | Tcb->SRtt = Measure << TCP_RTT_SHIFT;\r | |
248 | Tcb->RttVar = Measure << (TCP_RTT_SHIFT - 1);\r | |
249 | }\r | |
250 | \r | |
251 | Tcb->Rto = (Tcb->SRtt + MAX (8, 4 * Tcb->RttVar)) >> TCP_RTT_SHIFT;\r | |
252 | \r | |
253 | //\r | |
254 | // Step 2.4: Limit the RTO to at least 1 second\r | |
255 | // Step 2.5: Limit the RTO to a maxium value that\r | |
256 | // is at least 60 second\r | |
257 | //\r | |
258 | if (Tcb->Rto < TCP_RTO_MIN) {\r | |
259 | Tcb->Rto = TCP_RTO_MIN;\r | |
260 | \r | |
261 | } else if (Tcb->Rto > TCP_RTO_MAX) {\r | |
262 | Tcb->Rto = TCP_RTO_MAX;\r | |
263 | \r | |
264 | }\r | |
265 | \r | |
266 | DEBUG (\r | |
f3612a8d | 267 | (EFI_D_NET,\r |
a3bcde70 HT |
268 | "TcpComputeRtt: new RTT for TCB %p computed SRTT: %d RTTVAR: %d RTO: %d\n",\r |
269 | Tcb,\r | |
270 | Tcb->SRtt,\r | |
271 | Tcb->RttVar,\r | |
272 | Tcb->Rto)\r | |
273 | );\r | |
274 | \r | |
275 | }\r | |
276 | \r | |
277 | /**\r | |
278 | Trim the data; SYN and FIN to fit into the window defined by Left and Right.\r | |
279 | \r | |
280 | @param[in] Nbuf The buffer that contains a received TCP segment without an IP header.\r | |
281 | @param[in] Left The sequence number of the window's left edge.\r | |
282 | @param[in] Right The sequence number of the window's right edge.\r | |
283 | \r | |
786a4d19 JW |
284 | @retval 0 The segment is broken.\r |
285 | @retval 1 The segment is in good shape.\r | |
286 | \r | |
a3bcde70 | 287 | **/\r |
786a4d19 | 288 | INTN\r |
a3bcde70 HT |
289 | TcpTrimSegment (\r |
290 | IN NET_BUF *Nbuf,\r | |
291 | IN TCP_SEQNO Left,\r | |
292 | IN TCP_SEQNO Right\r | |
293 | )\r | |
294 | {\r | |
295 | TCP_SEG *Seg;\r | |
296 | TCP_SEQNO Urg;\r | |
297 | UINT32 Drop;\r | |
298 | \r | |
299 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
300 | \r | |
301 | //\r | |
302 | // If the segment is completely out of window,\r | |
303 | // truncate every thing, include SYN and FIN.\r | |
304 | //\r | |
305 | if (TCP_SEQ_LEQ (Seg->End, Left) || TCP_SEQ_LEQ (Right, Seg->Seq)) {\r | |
306 | \r | |
307 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_SYN);\r | |
308 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_FIN);\r | |
309 | \r | |
310 | Seg->Seq = Seg->End;\r | |
311 | NetbufTrim (Nbuf, Nbuf->TotalSize, NET_BUF_HEAD);\r | |
786a4d19 | 312 | return 1;\r |
a3bcde70 HT |
313 | }\r |
314 | \r | |
315 | //\r | |
316 | // Adjust the buffer header\r | |
317 | //\r | |
318 | if (TCP_SEQ_LT (Seg->Seq, Left)) {\r | |
319 | \r | |
320 | Drop = TCP_SUB_SEQ (Left, Seg->Seq);\r | |
321 | Urg = Seg->Seq + Seg->Urg;\r | |
322 | Seg->Seq = Left;\r | |
323 | \r | |
324 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
325 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_SYN);\r | |
326 | Drop--;\r | |
327 | }\r | |
328 | \r | |
329 | //\r | |
330 | // Adjust the urgent point\r | |
331 | //\r | |
332 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_URG)) {\r | |
333 | \r | |
334 | if (TCP_SEQ_LT (Urg, Seg->Seq)) {\r | |
335 | \r | |
336 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_URG);\r | |
337 | } else {\r | |
338 | Seg->Urg = (UINT16) TCP_SUB_SEQ (Urg, Seg->Seq);\r | |
339 | }\r | |
340 | }\r | |
341 | \r | |
342 | if (Drop != 0) {\r | |
343 | NetbufTrim (Nbuf, Drop, NET_BUF_HEAD);\r | |
344 | }\r | |
345 | }\r | |
346 | \r | |
347 | //\r | |
348 | // Adjust the buffer tail\r | |
349 | //\r | |
350 | if (TCP_SEQ_GT (Seg->End, Right)) {\r | |
351 | \r | |
352 | Drop = TCP_SUB_SEQ (Seg->End, Right);\r | |
353 | Seg->End = Right;\r | |
354 | \r | |
355 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_FIN)) {\r | |
356 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_FIN);\r | |
357 | Drop--;\r | |
358 | }\r | |
359 | \r | |
360 | if (Drop != 0) {\r | |
361 | NetbufTrim (Nbuf, Drop, NET_BUF_TAIL);\r | |
362 | }\r | |
363 | }\r | |
364 | \r | |
786a4d19 | 365 | return TcpVerifySegment (Nbuf);\r |
a3bcde70 HT |
366 | }\r |
367 | \r | |
368 | /**\r | |
369 | Trim off the data outside the tcb's receive window.\r | |
370 | \r | |
371 | @param[in] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
372 | @param[in] Nbuf Pointer to the NET_BUF containing the received tcp segment.\r | |
373 | \r | |
786a4d19 JW |
374 | @retval 0 The segment is broken.\r |
375 | @retval 1 The segment is in good shape.\r | |
376 | \r | |
a3bcde70 | 377 | **/\r |
786a4d19 | 378 | INTN\r |
a3bcde70 HT |
379 | TcpTrimInWnd (\r |
380 | IN TCP_CB *Tcb,\r | |
381 | IN NET_BUF *Nbuf\r | |
382 | )\r | |
383 | {\r | |
786a4d19 | 384 | return TcpTrimSegment (Nbuf, Tcb->RcvNxt, Tcb->RcvWl2 + Tcb->RcvWnd);\r |
a3bcde70 HT |
385 | }\r |
386 | \r | |
387 | /**\r | |
388 | Process the data and FIN flag, and check whether to deliver\r | |
389 | data to the socket layer.\r | |
390 | \r | |
391 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
392 | \r | |
393 | @retval 0 No error occurred to deliver data.\r | |
394 | @retval -1 An error condition occurred. The proper response is to reset the\r | |
395 | connection.\r | |
396 | \r | |
397 | **/\r | |
398 | INTN\r | |
399 | TcpDeliverData (\r | |
400 | IN OUT TCP_CB *Tcb\r | |
401 | )\r | |
402 | {\r | |
403 | LIST_ENTRY *Entry;\r | |
404 | NET_BUF *Nbuf;\r | |
405 | TCP_SEQNO Seq;\r | |
406 | TCP_SEG *Seg;\r | |
407 | UINT32 Urgent;\r | |
408 | \r | |
409 | ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL));\r | |
410 | \r | |
411 | //\r | |
412 | // make sure there is some data queued,\r | |
413 | // and TCP is in a proper state\r | |
414 | //\r | |
415 | if (IsListEmpty (&Tcb->RcvQue) || !TCP_CONNECTED (Tcb->State)) {\r | |
416 | \r | |
417 | return 0;\r | |
418 | }\r | |
419 | \r | |
420 | //\r | |
421 | // Deliver data to the socket layer\r | |
422 | //\r | |
423 | Entry = Tcb->RcvQue.ForwardLink;\r | |
424 | Seq = Tcb->RcvNxt;\r | |
425 | \r | |
426 | while (Entry != &Tcb->RcvQue) {\r | |
427 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
428 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
429 | \r | |
786a4d19 JW |
430 | if (TcpVerifySegment (Nbuf) == 0) {\r |
431 | DEBUG (\r | |
432 | (EFI_D_ERROR,\r | |
433 | "TcpToSendData: discard a broken segment for TCB %p\n",\r | |
434 | Tcb)\r | |
435 | );\r | |
436 | NetbufFree (Nbuf);\r | |
437 | return -1;\r | |
438 | }\r | |
f75a7f56 | 439 | \r |
a3bcde70 HT |
440 | ASSERT (Nbuf->Tcp == NULL);\r |
441 | \r | |
442 | if (TCP_SEQ_GT (Seg->Seq, Seq)) {\r | |
443 | break;\r | |
444 | }\r | |
445 | \r | |
446 | Entry = Entry->ForwardLink;\r | |
447 | Seq = Seg->End;\r | |
448 | Tcb->RcvNxt = Seq;\r | |
449 | \r | |
450 | RemoveEntryList (&Nbuf->List);\r | |
451 | \r | |
452 | //\r | |
453 | // RFC793 Eighth step: process FIN in sequence\r | |
454 | //\r | |
455 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_FIN)) {\r | |
456 | \r | |
457 | //\r | |
458 | // The peer sends to us junky data after FIN,\r | |
459 | // reset the connection.\r | |
460 | //\r | |
461 | if (!IsListEmpty (&Tcb->RcvQue)) {\r | |
462 | DEBUG (\r | |
463 | (EFI_D_ERROR,\r | |
464 | "TcpDeliverData: data received after FIN from peer of TCB %p, reset connection\n",\r | |
465 | Tcb)\r | |
466 | );\r | |
467 | \r | |
468 | NetbufFree (Nbuf);\r | |
469 | return -1;\r | |
470 | }\r | |
471 | \r | |
472 | DEBUG (\r | |
f3612a8d | 473 | (EFI_D_NET,\r |
a3bcde70 HT |
474 | "TcpDeliverData: processing FIN from peer of TCB %p\n",\r |
475 | Tcb)\r | |
476 | );\r | |
477 | \r | |
478 | switch (Tcb->State) {\r | |
479 | case TCP_SYN_RCVD:\r | |
480 | case TCP_ESTABLISHED:\r | |
481 | \r | |
482 | TcpSetState (Tcb, TCP_CLOSE_WAIT);\r | |
483 | break;\r | |
484 | \r | |
485 | case TCP_FIN_WAIT_1:\r | |
486 | \r | |
487 | if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
488 | \r | |
489 | TcpSetState (Tcb, TCP_CLOSING);\r | |
490 | break;\r | |
491 | }\r | |
492 | \r | |
493 | //\r | |
494 | // fall through\r | |
495 | //\r | |
496 | case TCP_FIN_WAIT_2:\r | |
497 | \r | |
498 | TcpSetState (Tcb, TCP_TIME_WAIT);\r | |
499 | TcpClearAllTimer (Tcb);\r | |
500 | \r | |
501 | if (Tcb->TimeWaitTimeout != 0) {\r | |
502 | \r | |
503 | TcpSetTimer (Tcb, TCP_TIMER_2MSL, Tcb->TimeWaitTimeout);\r | |
504 | } else {\r | |
505 | \r | |
506 | DEBUG (\r | |
507 | (EFI_D_WARN,\r | |
508 | "Connection closed immediately because app disables TIME_WAIT timer for %p\n",\r | |
509 | Tcb)\r | |
510 | );\r | |
511 | \r | |
512 | TcpSendAck (Tcb);\r | |
513 | TcpClose (Tcb);\r | |
514 | }\r | |
515 | break;\r | |
516 | \r | |
517 | case TCP_CLOSE_WAIT:\r | |
518 | case TCP_CLOSING:\r | |
519 | case TCP_LAST_ACK:\r | |
520 | case TCP_TIME_WAIT:\r | |
521 | //\r | |
522 | // The peer sends to us junk FIN byte. Discard\r | |
523 | // the buffer then reset the connection\r | |
524 | //\r | |
525 | NetbufFree (Nbuf);\r | |
526 | return -1;\r | |
527 | break;\r | |
528 | default:\r | |
529 | break;\r | |
530 | }\r | |
531 | \r | |
532 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
533 | \r | |
534 | Seg->End--;\r | |
535 | }\r | |
536 | \r | |
537 | //\r | |
538 | // Don't delay the ack if PUSH flag is on.\r | |
539 | //\r | |
540 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_PSH)) {\r | |
541 | \r | |
542 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
543 | }\r | |
544 | \r | |
545 | if (Nbuf->TotalSize != 0) {\r | |
546 | Urgent = 0;\r | |
547 | \r | |
548 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_URG) &&\r | |
49789216 BZ |
549 | TCP_SEQ_LEQ (Seg->Seq, Tcb->RcvUp))\r |
550 | {\r | |
a3bcde70 HT |
551 | \r |
552 | if (TCP_SEQ_LEQ (Seg->End, Tcb->RcvUp)) {\r | |
553 | Urgent = Nbuf->TotalSize;\r | |
554 | } else {\r | |
555 | Urgent = TCP_SUB_SEQ (Tcb->RcvUp, Seg->Seq) + 1;\r | |
556 | }\r | |
557 | }\r | |
558 | \r | |
559 | SockDataRcvd (Tcb->Sk, Nbuf, Urgent);\r | |
560 | }\r | |
561 | \r | |
562 | if (TCP_FIN_RCVD (Tcb->State)) {\r | |
563 | \r | |
564 | SockNoMoreData (Tcb->Sk);\r | |
565 | }\r | |
566 | \r | |
567 | NetbufFree (Nbuf);\r | |
568 | }\r | |
569 | \r | |
570 | return 0;\r | |
571 | }\r | |
572 | \r | |
573 | /**\r | |
574 | Store the data into the reassemble queue.\r | |
575 | \r | |
576 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
577 | @param[in] Nbuf Pointer to the buffer containing the data to be queued.\r | |
578 | \r | |
786a4d19 JW |
579 | @retval 0 An error condition occurred.\r |
580 | @retval 1 No error occurred to queue data.\r | |
581 | \r | |
a3bcde70 | 582 | **/\r |
786a4d19 | 583 | INTN\r |
a3bcde70 HT |
584 | TcpQueueData (\r |
585 | IN OUT TCP_CB *Tcb,\r | |
586 | IN NET_BUF *Nbuf\r | |
587 | )\r | |
588 | {\r | |
589 | TCP_SEG *Seg;\r | |
590 | LIST_ENTRY *Head;\r | |
591 | LIST_ENTRY *Prev;\r | |
592 | LIST_ENTRY *Cur;\r | |
593 | NET_BUF *Node;\r | |
594 | \r | |
595 | ASSERT ((Tcb != NULL) && (Nbuf != NULL) && (Nbuf->Tcp == NULL));\r | |
596 | \r | |
597 | NET_GET_REF (Nbuf);\r | |
598 | \r | |
599 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
600 | Head = &Tcb->RcvQue;\r | |
601 | \r | |
602 | //\r | |
603 | // Fast path to process normal case. That is,\r | |
604 | // no out-of-order segments are received.\r | |
605 | //\r | |
606 | if (IsListEmpty (Head)) {\r | |
607 | \r | |
608 | InsertTailList (Head, &Nbuf->List);\r | |
786a4d19 | 609 | return 1;\r |
a3bcde70 HT |
610 | }\r |
611 | \r | |
612 | //\r | |
613 | // Find the point to insert the buffer\r | |
614 | //\r | |
615 | for (Prev = Head, Cur = Head->ForwardLink;\r | |
616 | Cur != Head;\r | |
49789216 | 617 | Prev = Cur, Cur = Cur->ForwardLink) {\r |
a3bcde70 HT |
618 | \r |
619 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
620 | \r | |
621 | if (TCP_SEQ_LT (Seg->Seq, TCPSEG_NETBUF (Node)->Seq)) {\r | |
622 | break;\r | |
623 | }\r | |
624 | }\r | |
625 | \r | |
626 | //\r | |
627 | // Check whether the current segment overlaps with the\r | |
628 | // previous segment.\r | |
629 | //\r | |
630 | if (Prev != Head) {\r | |
631 | Node = NET_LIST_USER_STRUCT (Prev, NET_BUF, List);\r | |
632 | \r | |
633 | if (TCP_SEQ_LT (Seg->Seq, TCPSEG_NETBUF (Node)->End)) {\r | |
634 | \r | |
635 | if (TCP_SEQ_LEQ (Seg->End, TCPSEG_NETBUF (Node)->End)) {\r | |
786a4d19 | 636 | return 1;\r |
a3bcde70 HT |
637 | }\r |
638 | \r | |
786a4d19 JW |
639 | if (TcpTrimSegment (Nbuf, TCPSEG_NETBUF (Node)->End, Seg->End) == 0) {\r |
640 | return 0;\r | |
641 | }\r | |
a3bcde70 HT |
642 | }\r |
643 | }\r | |
644 | \r | |
645 | InsertHeadList (Prev, &Nbuf->List);\r | |
646 | \r | |
647 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
648 | \r | |
649 | //\r | |
650 | // Check the segments after the insert point.\r | |
651 | //\r | |
652 | while (Cur != Head) {\r | |
653 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
654 | \r | |
655 | if (TCP_SEQ_LEQ (TCPSEG_NETBUF (Node)->End, Seg->End)) {\r | |
656 | \r | |
657 | Cur = Cur->ForwardLink;\r | |
658 | \r | |
659 | RemoveEntryList (&Node->List);\r | |
660 | NetbufFree (Node);\r | |
661 | continue;\r | |
662 | }\r | |
663 | \r | |
664 | if (TCP_SEQ_LT (TCPSEG_NETBUF (Node)->Seq, Seg->End)) {\r | |
665 | \r | |
666 | if (TCP_SEQ_LEQ (TCPSEG_NETBUF (Node)->Seq, Seg->Seq)) {\r | |
667 | \r | |
668 | RemoveEntryList (&Nbuf->List);\r | |
786a4d19 | 669 | return 1;\r |
a3bcde70 HT |
670 | }\r |
671 | \r | |
786a4d19 JW |
672 | if (TcpTrimSegment (Nbuf, Seg->Seq, TCPSEG_NETBUF (Node)->Seq) == 0) {\r |
673 | RemoveEntryList (&Nbuf->List);\r | |
674 | return 0;\r | |
675 | }\r | |
a3bcde70 HT |
676 | break;\r |
677 | }\r | |
678 | \r | |
679 | Cur = Cur->ForwardLink;\r | |
680 | }\r | |
786a4d19 JW |
681 | \r |
682 | return 1;\r | |
a3bcde70 HT |
683 | }\r |
684 | \r | |
685 | \r | |
686 | /**\r | |
687 | Adjust the send queue or the retransmit queue.\r | |
688 | \r | |
689 | @param[in] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
690 | @param[in] Ack The acknowledge seuqence number of the received segment.\r | |
691 | \r | |
786a4d19 JW |
692 | @retval 0 An error condition occurred.\r |
693 | @retval 1 No error occurred.\r | |
694 | \r | |
a3bcde70 | 695 | **/\r |
786a4d19 | 696 | INTN\r |
a3bcde70 HT |
697 | TcpAdjustSndQue (\r |
698 | IN TCP_CB *Tcb,\r | |
699 | IN TCP_SEQNO Ack\r | |
700 | )\r | |
701 | {\r | |
702 | LIST_ENTRY *Head;\r | |
703 | LIST_ENTRY *Cur;\r | |
704 | NET_BUF *Node;\r | |
705 | TCP_SEG *Seg;\r | |
706 | \r | |
707 | Head = &Tcb->SndQue;\r | |
708 | Cur = Head->ForwardLink;\r | |
709 | \r | |
710 | while (Cur != Head) {\r | |
711 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
712 | Seg = TCPSEG_NETBUF (Node);\r | |
713 | \r | |
714 | if (TCP_SEQ_GEQ (Seg->Seq, Ack)) {\r | |
715 | break;\r | |
716 | }\r | |
717 | \r | |
718 | //\r | |
719 | // Remove completely ACKed segments\r | |
720 | //\r | |
721 | if (TCP_SEQ_LEQ (Seg->End, Ack)) {\r | |
722 | Cur = Cur->ForwardLink;\r | |
723 | \r | |
724 | RemoveEntryList (&Node->List);\r | |
725 | NetbufFree (Node);\r | |
726 | continue;\r | |
727 | }\r | |
728 | \r | |
786a4d19 | 729 | return TcpTrimSegment (Node, Ack, Seg->End);\r |
a3bcde70 | 730 | }\r |
786a4d19 JW |
731 | \r |
732 | return 1;\r | |
a3bcde70 HT |
733 | }\r |
734 | \r | |
735 | /**\r | |
736 | Process the received TCP segments.\r | |
737 | \r | |
738 | @param[in] Nbuf Buffer that contains received a TCP segment without an IP header.\r | |
739 | @param[in] Src Source address of the segment, or the peer's IP address.\r | |
740 | @param[in] Dst Destination address of the segment, or the local end's IP\r | |
741 | address.\r | |
742 | @param[in] Version IP_VERSION_4 indicates IP4 stack. IP_VERSION_6 indicates\r | |
743 | IP6 stack.\r | |
744 | \r | |
745 | @retval 0 Segment processed successfully. It is either accepted or\r | |
746 | discarded. However, no connection is reset by the segment.\r | |
747 | @retval -1 A connection is reset by the segment.\r | |
748 | \r | |
749 | **/\r | |
750 | INTN\r | |
751 | TcpInput (\r | |
752 | IN NET_BUF *Nbuf,\r | |
753 | IN EFI_IP_ADDRESS *Src,\r | |
754 | IN EFI_IP_ADDRESS *Dst,\r | |
755 | IN UINT8 Version\r | |
756 | )\r | |
757 | {\r | |
758 | TCP_CB *Tcb;\r | |
759 | TCP_CB *Parent;\r | |
760 | TCP_OPTION Option;\r | |
761 | TCP_HEAD *Head;\r | |
762 | INT32 Len;\r | |
763 | TCP_SEG *Seg;\r | |
764 | TCP_SEQNO Right;\r | |
765 | TCP_SEQNO Urg;\r | |
766 | UINT16 Checksum;\r | |
2d5afbda | 767 | INT32 Usable;\r |
a3bcde70 HT |
768 | \r |
769 | ASSERT ((Version == IP_VERSION_4) || (Version == IP_VERSION_6));\r | |
770 | \r | |
771 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
772 | \r | |
773 | Parent = NULL;\r | |
774 | Tcb = NULL;\r | |
775 | \r | |
776 | Head = (TCP_HEAD *) NetbufGetByte (Nbuf, 0, NULL);\r | |
777 | ASSERT (Head != NULL);\r | |
f75a7f56 | 778 | \r |
37b68011 | 779 | if (Nbuf->TotalSize < sizeof (TCP_HEAD)) {\r |
f3612a8d | 780 | DEBUG ((EFI_D_NET, "TcpInput: received a malformed packet\n"));\r |
37b68011 FS |
781 | goto DISCARD;\r |
782 | }\r | |
f75a7f56 | 783 | \r |
a3bcde70 HT |
784 | Len = Nbuf->TotalSize - (Head->HeadLen << 2);\r |
785 | \r | |
786 | if ((Head->HeadLen < 5) || (Len < 0)) {\r | |
787 | \r | |
f3612a8d | 788 | DEBUG ((EFI_D_NET, "TcpInput: received a malformed packet\n"));\r |
f75a7f56 | 789 | \r |
a3bcde70 HT |
790 | goto DISCARD;\r |
791 | }\r | |
792 | \r | |
793 | if (Version == IP_VERSION_4) {\r | |
794 | Checksum = NetPseudoHeadChecksum (Src->Addr[0], Dst->Addr[0], 6, 0);\r | |
795 | } else {\r | |
796 | Checksum = NetIp6PseudoHeadChecksum (&Src->v6, &Dst->v6, 6, 0);\r | |
797 | }\r | |
798 | \r | |
799 | Checksum = TcpChecksum (Nbuf, Checksum);\r | |
800 | \r | |
801 | if (Checksum != 0) {\r | |
802 | DEBUG ((EFI_D_ERROR, "TcpInput: received a checksum error packet\n"));\r | |
803 | goto DISCARD;\r | |
804 | }\r | |
805 | \r | |
806 | if (TCP_FLG_ON (Head->Flag, TCP_FLG_SYN)) {\r | |
807 | Len++;\r | |
808 | }\r | |
809 | \r | |
810 | if (TCP_FLG_ON (Head->Flag, TCP_FLG_FIN)) {\r | |
811 | Len++;\r | |
812 | }\r | |
813 | \r | |
814 | Tcb = TcpLocateTcb (\r | |
815 | Head->DstPort,\r | |
816 | Dst,\r | |
817 | Head->SrcPort,\r | |
818 | Src,\r | |
819 | Version,\r | |
820 | (BOOLEAN) TCP_FLG_ON (Head->Flag, TCP_FLG_SYN)\r | |
821 | );\r | |
822 | \r | |
823 | if ((Tcb == NULL) || (Tcb->State == TCP_CLOSED)) {\r | |
f3612a8d | 824 | DEBUG ((EFI_D_NET, "TcpInput: send reset because no TCB found\n"));\r |
a3bcde70 HT |
825 | \r |
826 | Tcb = NULL;\r | |
827 | goto SEND_RESET;\r | |
828 | }\r | |
829 | \r | |
830 | Seg = TcpFormatNetbuf (Tcb, Nbuf);\r | |
831 | \r | |
832 | //\r | |
833 | // RFC1122 recommended reaction to illegal option\r | |
834 | // (in fact, an illegal option length) is reset.\r | |
835 | //\r | |
836 | if (TcpParseOption (Nbuf->Tcp, &Option) == -1) {\r | |
837 | DEBUG (\r | |
838 | (EFI_D_ERROR,\r | |
49789216 | 839 | "TcpInput: reset the peer because of malformed option for TCB %p\n",\r |
a3bcde70 HT |
840 | Tcb)\r |
841 | );\r | |
842 | \r | |
843 | goto SEND_RESET;\r | |
844 | }\r | |
845 | \r | |
846 | //\r | |
847 | // From now on, the segment is headless\r | |
848 | //\r | |
849 | NetbufTrim (Nbuf, (Head->HeadLen << 2), NET_BUF_HEAD);\r | |
850 | Nbuf->Tcp = NULL;\r | |
851 | \r | |
852 | //\r | |
853 | // Process the segment in LISTEN state.\r | |
854 | //\r | |
855 | if (Tcb->State == TCP_LISTEN) {\r | |
856 | //\r | |
857 | // First step: Check RST\r | |
858 | //\r | |
859 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
860 | DEBUG (\r | |
861 | (EFI_D_WARN,\r | |
862 | "TcpInput: discard a reset segment for TCB %p in listening\n",\r | |
863 | Tcb)\r | |
864 | );\r | |
865 | \r | |
866 | goto DISCARD;\r | |
867 | }\r | |
868 | \r | |
869 | //\r | |
870 | // Second step: Check ACK.\r | |
871 | // Any ACK sent to TCP in LISTEN is reseted.\r | |
872 | //\r | |
873 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
874 | DEBUG (\r | |
875 | (EFI_D_WARN,\r | |
876 | "TcpInput: send reset because of segment with ACK for TCB %p in listening\n",\r | |
877 | Tcb)\r | |
878 | );\r | |
879 | \r | |
880 | goto SEND_RESET;\r | |
881 | }\r | |
882 | \r | |
883 | //\r | |
884 | // Third step: Check SYN\r | |
885 | //\r | |
886 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
887 | //\r | |
888 | // create a child TCB to handle the data\r | |
889 | //\r | |
890 | Parent = Tcb;\r | |
891 | \r | |
892 | Tcb = TcpCloneTcb (Parent);\r | |
893 | if (Tcb == NULL) {\r | |
894 | DEBUG (\r | |
895 | (EFI_D_ERROR,\r | |
49789216 | 896 | "TcpInput: discard a segment because failed to clone a child for TCB %p\n",\r |
a3bcde70 HT |
897 | Tcb)\r |
898 | );\r | |
899 | \r | |
900 | goto DISCARD;\r | |
901 | }\r | |
902 | \r | |
903 | DEBUG (\r | |
f3612a8d | 904 | (EFI_D_NET,\r |
a3bcde70 HT |
905 | "TcpInput: create a child for TCB %p in listening\n",\r |
906 | Tcb)\r | |
907 | );\r | |
908 | \r | |
909 | //\r | |
910 | // init the TCB structure\r | |
911 | //\r | |
912 | IP6_COPY_ADDRESS (&Tcb->LocalEnd.Ip, Dst);\r | |
913 | IP6_COPY_ADDRESS (&Tcb->RemoteEnd.Ip, Src);\r | |
914 | Tcb->LocalEnd.Port = Head->DstPort;\r | |
915 | Tcb->RemoteEnd.Port = Head->SrcPort;\r | |
916 | \r | |
917 | TcpInitTcbLocal (Tcb);\r | |
918 | TcpInitTcbPeer (Tcb, Seg, &Option);\r | |
919 | \r | |
920 | TcpSetState (Tcb, TCP_SYN_RCVD);\r | |
921 | TcpSetTimer (Tcb, TCP_TIMER_CONNECT, Tcb->ConnectTimeout);\r | |
786a4d19 JW |
922 | if (TcpTrimInWnd (Tcb, Nbuf) == 0) {\r |
923 | DEBUG (\r | |
924 | (EFI_D_ERROR,\r | |
925 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
926 | Tcb)\r | |
927 | );\r | |
928 | \r | |
929 | goto DISCARD;\r | |
930 | }\r | |
a3bcde70 HT |
931 | \r |
932 | goto StepSix;\r | |
933 | }\r | |
934 | \r | |
935 | goto DISCARD;\r | |
936 | \r | |
937 | } else if (Tcb->State == TCP_SYN_SENT) {\r | |
938 | //\r | |
939 | // First step: Check ACK bit\r | |
940 | //\r | |
941 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK) && (Seg->Ack != Tcb->Iss + 1)) {\r | |
942 | \r | |
943 | DEBUG (\r | |
944 | (EFI_D_WARN,\r | |
945 | "TcpInput: send reset because of wrong ACK received for TCB %p in SYN_SENT\n",\r | |
946 | Tcb)\r | |
947 | );\r | |
948 | \r | |
949 | goto SEND_RESET;\r | |
950 | }\r | |
951 | \r | |
952 | //\r | |
953 | // Second step: Check RST bit\r | |
954 | //\r | |
955 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
956 | \r | |
957 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
958 | \r | |
959 | DEBUG (\r | |
960 | (EFI_D_WARN,\r | |
961 | "TcpInput: connection reset by peer for TCB %p in SYN_SENT\n",\r | |
962 | Tcb)\r | |
963 | );\r | |
964 | \r | |
965 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_RESET);\r | |
966 | goto DROP_CONNECTION;\r | |
967 | } else {\r | |
968 | \r | |
969 | DEBUG (\r | |
970 | (EFI_D_WARN,\r | |
971 | "TcpInput: discard a reset segment because of no ACK for TCB %p in SYN_SENT\n",\r | |
972 | Tcb)\r | |
973 | );\r | |
974 | \r | |
975 | goto DISCARD;\r | |
976 | }\r | |
977 | }\r | |
978 | \r | |
979 | //\r | |
980 | // Third step: Check security and precedence. Skipped\r | |
981 | //\r | |
982 | \r | |
983 | //\r | |
49789216 | 984 | // Fourth step: Check SYN. Pay attention to simultaneous open\r |
a3bcde70 HT |
985 | //\r |
986 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
987 | \r | |
988 | TcpInitTcbPeer (Tcb, Seg, &Option);\r | |
989 | \r | |
990 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
991 | \r | |
992 | Tcb->SndUna = Seg->Ack;\r | |
993 | }\r | |
994 | \r | |
995 | TcpClearTimer (Tcb, TCP_TIMER_REXMIT);\r | |
996 | \r | |
997 | if (TCP_SEQ_GT (Tcb->SndUna, Tcb->Iss)) {\r | |
998 | \r | |
999 | TcpSetState (Tcb, TCP_ESTABLISHED);\r | |
1000 | \r | |
1001 | TcpClearTimer (Tcb, TCP_TIMER_CONNECT);\r | |
1002 | TcpDeliverData (Tcb);\r | |
1003 | \r | |
1004 | if ((Tcb->CongestState == TCP_CONGEST_OPEN) &&\r | |
49789216 BZ |
1005 | TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RTT_ON))\r |
1006 | {\r | |
a3bcde70 HT |
1007 | \r |
1008 | TcpComputeRtt (Tcb, Tcb->RttMeasure);\r | |
1009 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
1010 | }\r | |
1011 | \r | |
786a4d19 JW |
1012 | if (TcpTrimInWnd (Tcb, Nbuf) == 0) {\r |
1013 | DEBUG (\r | |
1014 | (EFI_D_ERROR,\r | |
1015 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1016 | Tcb)\r | |
1017 | );\r | |
1018 | \r | |
1019 | goto DISCARD;\r | |
1020 | }\r | |
a3bcde70 HT |
1021 | \r |
1022 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
1023 | \r | |
1024 | DEBUG (\r | |
f3612a8d | 1025 | (EFI_D_NET,\r |
a3bcde70 HT |
1026 | "TcpInput: connection established for TCB %p in SYN_SENT\n",\r |
1027 | Tcb)\r | |
1028 | );\r | |
1029 | \r | |
1030 | goto StepSix;\r | |
1031 | } else {\r | |
1032 | //\r | |
1033 | // Received a SYN segment without ACK, simultanous open.\r | |
1034 | //\r | |
1035 | TcpSetState (Tcb, TCP_SYN_RCVD);\r | |
1036 | \r | |
1037 | ASSERT (Tcb->SndNxt == Tcb->Iss + 1);\r | |
a3bcde70 | 1038 | \r |
786a4d19 JW |
1039 | if (TcpAdjustSndQue (Tcb, Tcb->SndNxt) == 0 || TcpTrimInWnd (Tcb, Nbuf) == 0) {\r |
1040 | DEBUG (\r | |
1041 | (EFI_D_ERROR,\r | |
1042 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1043 | Tcb)\r | |
1044 | );\r | |
1045 | \r | |
1046 | goto DISCARD;\r | |
1047 | }\r | |
a3bcde70 HT |
1048 | \r |
1049 | DEBUG (\r | |
1050 | (EFI_D_WARN,\r | |
49789216 | 1051 | "TcpInput: simultaneous open for TCB %p in SYN_SENT\n",\r |
a3bcde70 HT |
1052 | Tcb)\r |
1053 | );\r | |
1054 | \r | |
1055 | goto StepSix;\r | |
1056 | }\r | |
1057 | }\r | |
1058 | \r | |
1059 | goto DISCARD;\r | |
1060 | }\r | |
1061 | \r | |
1062 | //\r | |
1063 | // Process segment in SYN_RCVD or TCP_CONNECTED states\r | |
1064 | //\r | |
1065 | \r | |
1066 | //\r | |
1067 | // Clear probe timer since the RecvWindow is opened.\r | |
1068 | //\r | |
1069 | if (Tcb->ProbeTimerOn && (Seg->Wnd != 0)) {\r | |
1070 | TcpClearTimer (Tcb, TCP_TIMER_PROBE);\r | |
1071 | Tcb->ProbeTimerOn = FALSE;\r | |
1072 | }\r | |
1073 | \r | |
1074 | //\r | |
1075 | // First step: Check whether SEG.SEQ is acceptable\r | |
1076 | //\r | |
1077 | if (TcpSeqAcceptable (Tcb, Seg) == 0) {\r | |
1078 | DEBUG (\r | |
1079 | (EFI_D_WARN,\r | |
1080 | "TcpInput: sequence acceptance test failed for segment of TCB %p\n",\r | |
1081 | Tcb)\r | |
1082 | );\r | |
1083 | \r | |
1084 | if (!TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
1085 | TcpSendAck (Tcb);\r | |
1086 | }\r | |
1087 | \r | |
1088 | goto DISCARD;\r | |
1089 | }\r | |
1090 | \r | |
1091 | if ((TCP_SEQ_LT (Seg->Seq, Tcb->RcvWl2)) &&\r | |
1092 | (Tcb->RcvWl2 == Seg->End) &&\r | |
49789216 BZ |
1093 | !TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN | TCP_FLG_FIN))\r |
1094 | {\r | |
a3bcde70 HT |
1095 | \r |
1096 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
1097 | }\r | |
1098 | \r | |
1099 | //\r | |
1100 | // Second step: Check the RST\r | |
1101 | //\r | |
1102 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
1103 | \r | |
1104 | DEBUG ((EFI_D_WARN, "TcpInput: connection reset for TCB %p\n", Tcb));\r | |
1105 | \r | |
1106 | if (Tcb->State == TCP_SYN_RCVD) {\r | |
1107 | \r | |
1108 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_REFUSED);\r | |
1109 | \r | |
1110 | //\r | |
1111 | // This TCB comes from either a LISTEN TCB,\r | |
1112 | // or active open TCB with simultanous open.\r | |
1113 | // Do NOT signal user CONNECTION refused\r | |
1114 | // if it comes from a LISTEN TCB.\r | |
1115 | //\r | |
1116 | } else if ((Tcb->State == TCP_ESTABLISHED) ||\r | |
49789216 BZ |
1117 | (Tcb->State == TCP_FIN_WAIT_1) ||\r |
1118 | (Tcb->State == TCP_FIN_WAIT_2) ||\r | |
1119 | (Tcb->State == TCP_CLOSE_WAIT))\r | |
1120 | {\r | |
a3bcde70 HT |
1121 | \r |
1122 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_RESET);\r | |
1123 | \r | |
1124 | } else {\r | |
1125 | }\r | |
1126 | \r | |
1127 | goto DROP_CONNECTION;\r | |
1128 | }\r | |
1129 | \r | |
1130 | //\r | |
1131 | // Trim the data and flags.\r | |
1132 | //\r | |
786a4d19 JW |
1133 | if (TcpTrimInWnd (Tcb, Nbuf) == 0) {\r |
1134 | DEBUG (\r | |
1135 | (EFI_D_ERROR,\r | |
1136 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1137 | Tcb)\r | |
1138 | );\r | |
1139 | \r | |
1140 | goto DISCARD;\r | |
1141 | }\r | |
a3bcde70 HT |
1142 | \r |
1143 | //\r | |
1144 | // Third step: Check security and precedence, Ignored\r | |
1145 | //\r | |
1146 | \r | |
1147 | //\r | |
1148 | // Fourth step: Check the SYN bit.\r | |
1149 | //\r | |
1150 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
1151 | \r | |
1152 | DEBUG (\r | |
1153 | (EFI_D_WARN,\r | |
1154 | "TcpInput: connection reset because received extra SYN for TCB %p\n",\r | |
1155 | Tcb)\r | |
1156 | );\r | |
1157 | \r | |
1158 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_RESET);\r | |
1159 | goto RESET_THEN_DROP;\r | |
1160 | }\r | |
1161 | //\r | |
1162 | // Fifth step: Check the ACK\r | |
1163 | //\r | |
1164 | if (!TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
1165 | DEBUG (\r | |
1166 | (EFI_D_WARN,\r | |
1167 | "TcpInput: segment discard because of no ACK for connected TCB %p\n",\r | |
1168 | Tcb)\r | |
1169 | );\r | |
1170 | \r | |
1171 | goto DISCARD;\r | |
1172 | } else {\r | |
1173 | if (Tcb->IpInfo->IpVersion == IP_VERSION_6 && Tcb->Tick == 0) {\r | |
1174 | Tcp6RefreshNeighbor (Tcb, Src, TCP6_KEEP_NEIGHBOR_TIME * TICKS_PER_SECOND);\r | |
1175 | Tcb->Tick = TCP6_REFRESH_NEIGHBOR_TICK;\r | |
1176 | }\r | |
1177 | }\r | |
1178 | \r | |
1179 | if (Tcb->State == TCP_SYN_RCVD) {\r | |
1180 | \r | |
49789216 BZ |
1181 | if (TCP_SEQ_LT (Tcb->SndUna, Seg->Ack) &&\r |
1182 | TCP_SEQ_LEQ (Seg->Ack, Tcb->SndNxt))\r | |
1183 | {\r | |
a3bcde70 HT |
1184 | \r |
1185 | Tcb->SndWnd = Seg->Wnd;\r | |
1186 | Tcb->SndWndMax = MAX (Tcb->SndWnd, Tcb->SndWndMax);\r | |
1187 | Tcb->SndWl1 = Seg->Seq;\r | |
1188 | Tcb->SndWl2 = Seg->Ack;\r | |
1189 | TcpSetState (Tcb, TCP_ESTABLISHED);\r | |
1190 | \r | |
1191 | TcpClearTimer (Tcb, TCP_TIMER_CONNECT);\r | |
1192 | TcpDeliverData (Tcb);\r | |
1193 | \r | |
1194 | DEBUG (\r | |
f3612a8d | 1195 | (EFI_D_NET,\r |
49789216 | 1196 | "TcpInput: connection established for TCB %p in SYN_RCVD\n",\r |
a3bcde70 HT |
1197 | Tcb)\r |
1198 | );\r | |
1199 | \r | |
1200 | //\r | |
1201 | // Continue the process as ESTABLISHED state\r | |
1202 | //\r | |
1203 | } else {\r | |
1204 | DEBUG (\r | |
1205 | (EFI_D_WARN,\r | |
1206 | "TcpInput: send reset because of wrong ACK for TCB %p in SYN_RCVD\n",\r | |
1207 | Tcb)\r | |
1208 | );\r | |
1209 | \r | |
1210 | goto SEND_RESET;\r | |
1211 | }\r | |
1212 | }\r | |
1213 | \r | |
1214 | if (TCP_SEQ_LT (Seg->Ack, Tcb->SndUna)) {\r | |
1215 | \r | |
1216 | DEBUG (\r | |
1217 | (EFI_D_WARN,\r | |
1218 | "TcpInput: ignore the out-of-data ACK for connected TCB %p\n",\r | |
1219 | Tcb)\r | |
1220 | );\r | |
1221 | \r | |
1222 | goto StepSix;\r | |
1223 | \r | |
1224 | } else if (TCP_SEQ_GT (Seg->Ack, Tcb->SndNxt)) {\r | |
1225 | \r | |
1226 | DEBUG (\r | |
1227 | (EFI_D_WARN,\r | |
1228 | "TcpInput: discard segment for future ACK for connected TCB %p\n",\r | |
1229 | Tcb)\r | |
1230 | );\r | |
1231 | \r | |
1232 | TcpSendAck (Tcb);\r | |
1233 | goto DISCARD;\r | |
1234 | }\r | |
1235 | \r | |
1236 | //\r | |
1237 | // From now on: SND.UNA <= SEG.ACK <= SND.NXT.\r | |
1238 | //\r | |
1239 | if (TCP_FLG_ON (Option.Flag, TCP_OPTION_RCVD_TS)) {\r | |
1240 | //\r | |
1241 | // update TsRecent as specified in page 16 RFC1323.\r | |
1242 | // RcvWl2 equals to the variable "LastAckSent"\r | |
1243 | // defined there.\r | |
1244 | //\r | |
49789216 BZ |
1245 | if (TCP_SEQ_LEQ (Seg->Seq, Tcb->RcvWl2) &&\r |
1246 | TCP_SEQ_LT (Tcb->RcvWl2, Seg->End))\r | |
1247 | {\r | |
a3bcde70 HT |
1248 | \r |
1249 | Tcb->TsRecent = Option.TSVal;\r | |
1250 | Tcb->TsRecentAge = mTcpTick;\r | |
1251 | }\r | |
1252 | \r | |
1253 | TcpComputeRtt (Tcb, TCP_SUB_TIME (mTcpTick, Option.TSEcr));\r | |
1254 | \r | |
1255 | } else if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RTT_ON)) {\r | |
1256 | \r | |
1257 | ASSERT (Tcb->CongestState == TCP_CONGEST_OPEN);\r | |
1258 | \r | |
1259 | TcpComputeRtt (Tcb, Tcb->RttMeasure);\r | |
1260 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
1261 | }\r | |
1262 | \r | |
1263 | if (Seg->Ack == Tcb->SndNxt) {\r | |
1264 | \r | |
1265 | TcpClearTimer (Tcb, TCP_TIMER_REXMIT);\r | |
1266 | } else {\r | |
1267 | \r | |
1268 | TcpSetTimer (Tcb, TCP_TIMER_REXMIT, Tcb->Rto);\r | |
1269 | }\r | |
1270 | \r | |
1271 | //\r | |
1272 | // Count duplicate acks.\r | |
1273 | //\r | |
1274 | if ((Seg->Ack == Tcb->SndUna) &&\r | |
1275 | (Tcb->SndUna != Tcb->SndNxt) &&\r | |
1276 | (Seg->Wnd == Tcb->SndWnd) &&\r | |
49789216 BZ |
1277 | (0 == Len))\r |
1278 | {\r | |
a3bcde70 HT |
1279 | \r |
1280 | Tcb->DupAck++;\r | |
1281 | } else {\r | |
1282 | \r | |
1283 | Tcb->DupAck = 0;\r | |
1284 | }\r | |
1285 | \r | |
1286 | //\r | |
1287 | // Congestion avoidance, fast recovery and fast retransmission.\r | |
1288 | //\r | |
1289 | if (((Tcb->CongestState == TCP_CONGEST_OPEN) && (Tcb->DupAck < 3)) ||\r | |
49789216 BZ |
1290 | (Tcb->CongestState == TCP_CONGEST_LOSS))\r |
1291 | {\r | |
a3bcde70 HT |
1292 | \r |
1293 | if (TCP_SEQ_GT (Seg->Ack, Tcb->SndUna)) {\r | |
1294 | \r | |
1295 | if (Tcb->CWnd < Tcb->Ssthresh) {\r | |
1296 | \r | |
1297 | Tcb->CWnd += Tcb->SndMss;\r | |
1298 | } else {\r | |
1299 | \r | |
1300 | Tcb->CWnd += MAX (Tcb->SndMss * Tcb->SndMss / Tcb->CWnd, 1);\r | |
1301 | }\r | |
1302 | \r | |
1303 | Tcb->CWnd = MIN (Tcb->CWnd, TCP_MAX_WIN << Tcb->SndWndScale);\r | |
1304 | }\r | |
1305 | \r | |
1306 | if (Tcb->CongestState == TCP_CONGEST_LOSS) {\r | |
1307 | TcpFastLossRecover (Tcb, Seg);\r | |
1308 | }\r | |
1309 | } else {\r | |
1310 | \r | |
1311 | TcpFastRecover (Tcb, Seg);\r | |
1312 | }\r | |
1313 | \r | |
1314 | if (TCP_SEQ_GT (Seg->Ack, Tcb->SndUna)) {\r | |
1315 | \r | |
786a4d19 JW |
1316 | if (TcpAdjustSndQue (Tcb, Seg->Ack) == 0) {\r |
1317 | DEBUG (\r | |
1318 | (EFI_D_ERROR,\r | |
1319 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1320 | Tcb)\r | |
1321 | );\r | |
1322 | \r | |
1323 | goto DISCARD;\r | |
1324 | }\r | |
f75a7f56 | 1325 | \r |
a3bcde70 HT |
1326 | Tcb->SndUna = Seg->Ack;\r |
1327 | \r | |
1328 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_SND_URG) &&\r | |
49789216 BZ |
1329 | TCP_SEQ_LT (Tcb->SndUp, Seg->Ack))\r |
1330 | {\r | |
a3bcde70 HT |
1331 | \r |
1332 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_SND_URG);\r | |
1333 | }\r | |
1334 | }\r | |
1335 | \r | |
1336 | //\r | |
1337 | // Update window info\r | |
1338 | //\r | |
1339 | if (TCP_SEQ_LT (Tcb->SndWl1, Seg->Seq) ||\r | |
49789216 BZ |
1340 | ((Tcb->SndWl1 == Seg->Seq) && TCP_SEQ_LEQ (Tcb->SndWl2, Seg->Ack)))\r |
1341 | {\r | |
a3bcde70 HT |
1342 | \r |
1343 | Right = Seg->Ack + Seg->Wnd;\r | |
1344 | \r | |
1345 | if (TCP_SEQ_LT (Right, Tcb->SndWl2 + Tcb->SndWnd)) {\r | |
1346 | \r | |
1347 | if ((Tcb->SndWl1 == Seg->Seq) &&\r | |
1348 | (Tcb->SndWl2 == Seg->Ack) &&\r | |
49789216 BZ |
1349 | (Len == 0))\r |
1350 | {\r | |
a3bcde70 HT |
1351 | \r |
1352 | goto NO_UPDATE;\r | |
1353 | }\r | |
1354 | \r | |
1355 | DEBUG (\r | |
1356 | (EFI_D_WARN,\r | |
1357 | "TcpInput: peer shrinks the window for connected TCB %p\n",\r | |
1358 | Tcb)\r | |
1359 | );\r | |
1360 | \r | |
49789216 BZ |
1361 | if ((Tcb->CongestState == TCP_CONGEST_RECOVER) &&\r |
1362 | (TCP_SEQ_LT (Right, Tcb->Recover)))\r | |
1363 | {\r | |
a3bcde70 HT |
1364 | \r |
1365 | Tcb->Recover = Right;\r | |
1366 | }\r | |
1367 | \r | |
49789216 BZ |
1368 | if ((Tcb->CongestState == TCP_CONGEST_LOSS) &&\r |
1369 | (TCP_SEQ_LT (Right, Tcb->LossRecover)))\r | |
1370 | {\r | |
a3bcde70 HT |
1371 | \r |
1372 | Tcb->LossRecover = Right;\r | |
1373 | }\r | |
1374 | \r | |
1375 | if (TCP_SEQ_LT (Right, Tcb->SndNxt)) {\r | |
2d5afbda FS |
1376 | //\r |
1377 | // Check for Window Retraction in RFC7923 section 2.4.\r | |
1378 | // The lower n bits of the peer's actual receive window is wiped out if TCP\r | |
1379 | // window scale is enabled, it will look like the peer is shrinking the window.\r | |
1380 | // Check whether the SndNxt is out of the advertised receive window by more than\r | |
1381 | // 2^Rcv.Wind.Shift before moving the SndNxt to the left.\r | |
1382 | //\r | |
1383 | DEBUG (\r | |
1384 | (EFI_D_WARN,\r | |
1385 | "TcpInput: peer advise negative useable window for connected TCB %p\n",\r | |
1386 | Tcb)\r | |
1387 | );\r | |
1388 | Usable = TCP_SUB_SEQ (Tcb->SndNxt, Right);\r | |
1389 | if ((Usable >> Tcb->SndWndScale) > 0) {\r | |
1390 | DEBUG (\r | |
1391 | (EFI_D_WARN,\r | |
1392 | "TcpInput: SndNxt is out of window by more than window scale for TCB %p\n",\r | |
1393 | Tcb)\r | |
1394 | );\r | |
1395 | Tcb->SndNxt = Right;\r | |
1396 | }\r | |
a3bcde70 HT |
1397 | if (Right == Tcb->SndUna) {\r |
1398 | \r | |
1399 | TcpClearTimer (Tcb, TCP_TIMER_REXMIT);\r | |
1400 | TcpSetProbeTimer (Tcb);\r | |
1401 | }\r | |
1402 | }\r | |
1403 | }\r | |
1404 | \r | |
1405 | Tcb->SndWnd = Seg->Wnd;\r | |
1406 | Tcb->SndWndMax = MAX (Tcb->SndWnd, Tcb->SndWndMax);\r | |
1407 | Tcb->SndWl1 = Seg->Seq;\r | |
1408 | Tcb->SndWl2 = Seg->Ack;\r | |
1409 | }\r | |
1410 | \r | |
1411 | NO_UPDATE:\r | |
1412 | \r | |
49789216 BZ |
1413 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_SENT) &&\r |
1414 | (Tcb->SndUna == Tcb->SndNxt))\r | |
1415 | {\r | |
a3bcde70 HT |
1416 | \r |
1417 | DEBUG (\r | |
f3612a8d | 1418 | (EFI_D_NET,\r |
a3bcde70 HT |
1419 | "TcpInput: local FIN is ACKed by peer for connected TCB %p\n",\r |
1420 | Tcb)\r | |
1421 | );\r | |
1422 | \r | |
1423 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED);\r | |
1424 | }\r | |
1425 | \r | |
1426 | //\r | |
1427 | // Transit the state if proper.\r | |
1428 | //\r | |
1429 | switch (Tcb->State) {\r | |
1430 | case TCP_FIN_WAIT_1:\r | |
1431 | \r | |
1432 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
1433 | \r | |
1434 | TcpSetState (Tcb, TCP_FIN_WAIT_2);\r | |
1435 | \r | |
1436 | TcpClearAllTimer (Tcb);\r | |
1437 | TcpSetTimer (Tcb, TCP_TIMER_FINWAIT2, Tcb->FinWait2Timeout);\r | |
1438 | }\r | |
1439 | \r | |
1440 | case TCP_FIN_WAIT_2:\r | |
1441 | \r | |
1442 | break;\r | |
1443 | \r | |
1444 | case TCP_CLOSE_WAIT:\r | |
1445 | break;\r | |
1446 | \r | |
1447 | case TCP_CLOSING:\r | |
1448 | \r | |
1449 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
1450 | \r | |
1451 | TcpSetState (Tcb, TCP_TIME_WAIT);\r | |
1452 | \r | |
1453 | TcpClearAllTimer (Tcb);\r | |
1454 | \r | |
1455 | if (Tcb->TimeWaitTimeout != 0) {\r | |
1456 | \r | |
1457 | TcpSetTimer (Tcb, TCP_TIMER_2MSL, Tcb->TimeWaitTimeout);\r | |
1458 | } else {\r | |
1459 | \r | |
1460 | DEBUG (\r | |
1461 | (EFI_D_WARN,\r | |
1462 | "Connection closed immediately because app disables TIME_WAIT timer for %p\n",\r | |
1463 | Tcb)\r | |
1464 | );\r | |
1465 | \r | |
1466 | TcpClose (Tcb);\r | |
1467 | }\r | |
1468 | }\r | |
1469 | break;\r | |
1470 | \r | |
1471 | case TCP_LAST_ACK:\r | |
1472 | \r | |
1473 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
1474 | \r | |
1475 | TcpSetState (Tcb, TCP_CLOSED);\r | |
1476 | }\r | |
1477 | \r | |
1478 | break;\r | |
1479 | \r | |
1480 | case TCP_TIME_WAIT:\r | |
1481 | \r | |
1482 | TcpSendAck (Tcb);\r | |
1483 | \r | |
1484 | if (Tcb->TimeWaitTimeout != 0) {\r | |
1485 | \r | |
1486 | TcpSetTimer (Tcb, TCP_TIMER_2MSL, Tcb->TimeWaitTimeout);\r | |
1487 | } else {\r | |
1488 | \r | |
1489 | DEBUG (\r | |
1490 | (EFI_D_WARN,\r | |
1491 | "Connection closed immediately because app disables TIME_WAIT timer for %p\n",\r | |
1492 | Tcb)\r | |
1493 | );\r | |
1494 | \r | |
1495 | TcpClose (Tcb);\r | |
1496 | }\r | |
1497 | break;\r | |
1498 | \r | |
1499 | default:\r | |
1500 | break;\r | |
1501 | }\r | |
1502 | //\r | |
1503 | // Sixth step: Check the URG bit.update the Urg point\r | |
1504 | // if in TCP_CAN_RECV, otherwise, leave the RcvUp intact.\r | |
1505 | //\r | |
1506 | StepSix:\r | |
1507 | \r | |
1508 | Tcb->Idle = 0;\r | |
1509 | TcpSetKeepaliveTimer (Tcb);\r | |
1510 | \r | |
1511 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_URG) && !TCP_FIN_RCVD (Tcb->State)) {\r | |
1512 | \r | |
1513 | DEBUG (\r | |
f3612a8d | 1514 | (EFI_D_NET,\r |
a3bcde70 HT |
1515 | "TcpInput: received urgent data from peer for connected TCB %p\n",\r |
1516 | Tcb)\r | |
1517 | );\r | |
1518 | \r | |
1519 | Urg = Seg->Seq + Seg->Urg;\r | |
1520 | \r | |
49789216 BZ |
1521 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_URG) &&\r |
1522 | TCP_SEQ_GT (Urg, Tcb->RcvUp))\r | |
1523 | {\r | |
a3bcde70 HT |
1524 | \r |
1525 | Tcb->RcvUp = Urg;\r | |
1526 | } else {\r | |
1527 | \r | |
1528 | Tcb->RcvUp = Urg;\r | |
1529 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_RCVD_URG);\r | |
1530 | }\r | |
1531 | }\r | |
1532 | //\r | |
1533 | // Seventh step: Process the segment data\r | |
1534 | //\r | |
1535 | if (Seg->End != Seg->Seq) {\r | |
1536 | \r | |
1537 | if (TCP_FIN_RCVD (Tcb->State)) {\r | |
1538 | \r | |
1539 | DEBUG (\r | |
1540 | (EFI_D_WARN,\r | |
1541 | "TcpInput: connection reset because data is lost for connected TCB %p\n",\r | |
1542 | Tcb)\r | |
1543 | );\r | |
1544 | \r | |
1545 | goto RESET_THEN_DROP;\r | |
1546 | }\r | |
1547 | \r | |
1548 | if (TCP_LOCAL_CLOSED (Tcb->State) && (Nbuf->TotalSize != 0)) {\r | |
1549 | DEBUG (\r | |
1550 | (EFI_D_WARN,\r | |
1551 | "TcpInput: connection reset because data is lost for connected TCB %p\n",\r | |
1552 | Tcb)\r | |
1553 | );\r | |
1554 | \r | |
1555 | goto RESET_THEN_DROP;\r | |
1556 | }\r | |
1557 | \r | |
786a4d19 JW |
1558 | if (TcpQueueData (Tcb, Nbuf) == 0) {\r |
1559 | DEBUG (\r | |
1560 | (EFI_D_ERROR,\r | |
1561 | "TcpInput: discard a broken segment for TCB %p\n",\r | |
1562 | Tcb)\r | |
1563 | );\r | |
1564 | \r | |
1565 | goto DISCARD;\r | |
1566 | }\r | |
f75a7f56 | 1567 | \r |
a3bcde70 HT |
1568 | if (TcpDeliverData (Tcb) == -1) {\r |
1569 | goto RESET_THEN_DROP;\r | |
1570 | }\r | |
1571 | \r | |
1572 | if (!IsListEmpty (&Tcb->RcvQue)) {\r | |
1573 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
1574 | }\r | |
1575 | }\r | |
1576 | \r | |
1577 | //\r | |
1578 | // Eighth step: check the FIN.\r | |
1579 | // This step is moved to TcpDeliverData. FIN will be\r | |
1580 | // processed in sequence there. Check the comments in\r | |
1581 | // the beginning of the file header for information.\r | |
1582 | //\r | |
1583 | \r | |
1584 | //\r | |
1585 | // Tcb is a new child of the listening Parent,\r | |
1586 | // commit it.\r | |
1587 | //\r | |
1588 | if (Parent != NULL) {\r | |
1589 | Tcb->Parent = Parent;\r | |
1590 | TcpInsertTcb (Tcb);\r | |
1591 | }\r | |
1592 | \r | |
1593 | if ((Tcb->State != TCP_CLOSED) &&\r | |
1594 | (TcpToSendData (Tcb, 0) == 0) &&\r | |
49789216 BZ |
1595 | (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW) || (Nbuf->TotalSize != 0)))\r |
1596 | {\r | |
a3bcde70 HT |
1597 | \r |
1598 | TcpToSendAck (Tcb);\r | |
1599 | }\r | |
1600 | \r | |
1601 | NetbufFree (Nbuf);\r | |
1602 | return 0;\r | |
1603 | \r | |
1604 | RESET_THEN_DROP:\r | |
1605 | TcpSendReset (Tcb, Head, Len, Dst, Src, Version);\r | |
1606 | \r | |
1607 | DROP_CONNECTION:\r | |
1608 | ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL));\r | |
1609 | \r | |
1610 | NetbufFree (Nbuf);\r | |
1611 | TcpClose (Tcb);\r | |
1612 | \r | |
1613 | return -1;\r | |
1614 | \r | |
1615 | SEND_RESET:\r | |
1616 | \r | |
1617 | TcpSendReset (Tcb, Head, Len, Dst, Src, Version);\r | |
1618 | \r | |
1619 | DISCARD:\r | |
1620 | \r | |
1621 | //\r | |
1622 | // Tcb is a child of Parent, and it doesn't survive\r | |
1623 | //\r | |
1624 | DEBUG ((EFI_D_WARN, "TcpInput: Discard a packet\n"));\r | |
1625 | NetbufFree (Nbuf);\r | |
1626 | \r | |
1627 | if ((Parent != NULL) && (Tcb != NULL)) {\r | |
1628 | \r | |
1629 | ASSERT (Tcb->Sk != NULL);\r | |
1630 | TcpClose (Tcb);\r | |
1631 | }\r | |
1632 | \r | |
1633 | return 0;\r | |
1634 | }\r | |
1635 | \r | |
1636 | /**\r | |
1637 | Process the received ICMP error messages for TCP.\r | |
1638 | \r | |
1639 | @param[in] Nbuf The buffer that contains part of the TCP segment without an IP header\r | |
1640 | truncated from the ICMP error packet.\r | |
1641 | @param[in] IcmpErr The ICMP error code interpreted from an ICMP error packet.\r | |
1642 | @param[in] Src Source address of the ICMP error message.\r | |
1643 | @param[in] Dst Destination address of the ICMP error message.\r | |
1644 | @param[in] Version IP_VERSION_4 indicates IP4 stack. IP_VERSION_6 indicates\r | |
1645 | IP6 stack.\r | |
1646 | \r | |
1647 | **/\r | |
1648 | VOID\r | |
1649 | TcpIcmpInput (\r | |
1650 | IN NET_BUF *Nbuf,\r | |
1651 | IN UINT8 IcmpErr,\r | |
1652 | IN EFI_IP_ADDRESS *Src,\r | |
1653 | IN EFI_IP_ADDRESS *Dst,\r | |
1654 | IN UINT8 Version\r | |
1655 | )\r | |
1656 | {\r | |
1657 | TCP_HEAD *Head;\r | |
1658 | TCP_CB *Tcb;\r | |
1659 | TCP_SEQNO Seq;\r | |
1660 | EFI_STATUS IcmpErrStatus;\r | |
1661 | BOOLEAN IcmpErrIsHard;\r | |
1662 | BOOLEAN IcmpErrNotify;\r | |
1663 | \r | |
37b68011 FS |
1664 | if (Nbuf->TotalSize < sizeof (TCP_HEAD)) {\r |
1665 | goto CLEAN_EXIT;\r | |
1666 | }\r | |
f75a7f56 | 1667 | \r |
a3bcde70 HT |
1668 | Head = (TCP_HEAD *) NetbufGetByte (Nbuf, 0, NULL);\r |
1669 | ASSERT (Head != NULL);\r | |
1670 | \r | |
1671 | Tcb = TcpLocateTcb (\r | |
1672 | Head->DstPort,\r | |
1673 | Dst,\r | |
1674 | Head->SrcPort,\r | |
1675 | Src,\r | |
1676 | Version,\r | |
1677 | FALSE\r | |
1678 | );\r | |
1679 | if (Tcb == NULL || Tcb->State == TCP_CLOSED) {\r | |
1680 | \r | |
1681 | goto CLEAN_EXIT;\r | |
1682 | }\r | |
1683 | \r | |
1684 | //\r | |
1685 | // Validate the sequence number.\r | |
1686 | //\r | |
1687 | Seq = NTOHL (Head->Seq);\r | |
1688 | if (!(TCP_SEQ_LEQ (Tcb->SndUna, Seq) && TCP_SEQ_LT (Seq, Tcb->SndNxt))) {\r | |
1689 | \r | |
1690 | goto CLEAN_EXIT;\r | |
1691 | }\r | |
1692 | \r | |
49789216 BZ |
1693 | IcmpErrStatus = IpIoGetIcmpErrStatus (\r |
1694 | IcmpErr,\r | |
1695 | Tcb->Sk->IpVersion,\r | |
1696 | &IcmpErrIsHard,\r | |
1697 | &IcmpErrNotify\r | |
1698 | );\r | |
a3bcde70 HT |
1699 | \r |
1700 | if (IcmpErrNotify) {\r | |
1701 | \r | |
1702 | SOCK_ERROR (Tcb->Sk, IcmpErrStatus);\r | |
1703 | }\r | |
1704 | \r | |
1705 | if (IcmpErrIsHard) {\r | |
1706 | \r | |
1707 | TcpClose (Tcb);\r | |
1708 | }\r | |
1709 | \r | |
1710 | CLEAN_EXIT:\r | |
1711 | \r | |
1712 | NetbufFree (Nbuf);\r | |
1713 | }\r |