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8a67d61d | 1 | /** @file\r |
dfc1f033 | 2 | TCP input process routines.\r |
8a67d61d | 3 | \r |
d1102dba | 4 | Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved.<BR>\r |
e5eed7d3 | 5 | This program and the accompanying materials\r |
8a67d61d | 6 | are licensed and made available under the terms and conditions of the BSD License\r |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
dfc1f033 | 8 | http://opensource.org/licenses/bsd-license.php<BR>\r |
8a67d61d | 9 | \r |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
8a67d61d | 13 | **/\r |
14 | \r | |
dfc1f033 | 15 | \r |
8a67d61d | 16 | #include "Tcp4Main.h"\r |
17 | \r | |
18 | \r | |
19 | /**\r | |
120db52c | 20 | Check whether the sequence number of the incoming segment is acceptable.\r |
8a67d61d | 21 | \r |
22 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
23 | @param Seg Pointer to the incoming segment.\r | |
24 | \r | |
120db52c | 25 | @retval 1 The sequence number is acceptable.\r |
26 | @retval 0 The sequence number is not acceptable.\r | |
8a67d61d | 27 | \r |
28 | **/\r | |
29 | INTN\r | |
30 | TcpSeqAcceptable (\r | |
31 | IN TCP_CB *Tcb,\r | |
32 | IN TCP_SEG *Seg\r | |
33 | )\r | |
34 | {\r | |
977528ba | 35 | return (TCP_SEQ_LEQ (Tcb->RcvNxt, Seg->End) &&\r |
ac8cca2a | 36 | TCP_SEQ_LT (Seg->Seq, Tcb->RcvWl2 + Tcb->RcvWnd));\r |
8a67d61d | 37 | }\r |
38 | \r | |
39 | \r | |
40 | /**\r | |
41 | NewReno fast recovery, RFC3782.\r | |
42 | \r | |
43 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
44 | @param Seg Segment that triggers the fast recovery.\r | |
45 | \r | |
8a67d61d | 46 | **/\r |
47 | VOID\r | |
48 | TcpFastRecover (\r | |
77f00155 | 49 | IN OUT TCP_CB *Tcb,\r |
50 | IN TCP_SEG *Seg\r | |
8a67d61d | 51 | )\r |
52 | {\r | |
53 | UINT32 FlightSize;\r | |
54 | UINT32 Acked;\r | |
55 | \r | |
56 | //\r | |
57 | // Step 1: Three duplicate ACKs and not in fast recovery\r | |
58 | //\r | |
59 | if (Tcb->CongestState != TCP_CONGEST_RECOVER) {\r | |
60 | \r | |
61 | //\r | |
62 | // Step 1A: Invoking fast retransmission.\r | |
63 | //\r | |
49789216 | 64 | FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);\r |
8a67d61d | 65 | \r |
36ee91ca | 66 | Tcb->Ssthresh = MAX (FlightSize >> 1, (UINT32) (2 * Tcb->SndMss));\r |
8a67d61d | 67 | Tcb->Recover = Tcb->SndNxt;\r |
68 | \r | |
69 | Tcb->CongestState = TCP_CONGEST_RECOVER;\r | |
70 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
71 | \r | |
72 | //\r | |
73 | // Step 2: Entering fast retransmission\r | |
74 | //\r | |
75 | TcpRetransmit (Tcb, Tcb->SndUna);\r | |
76 | Tcb->CWnd = Tcb->Ssthresh + 3 * Tcb->SndMss;\r | |
77 | \r | |
dea6914d | 78 | DEBUG ((EFI_D_NET, "TcpFastRecover: enter fast retransmission"\r |
0e549d5b | 79 | " for TCB %p, recover point is %d\n", Tcb, Tcb->Recover));\r |
8a67d61d | 80 | return;\r |
81 | }\r | |
82 | \r | |
83 | //\r | |
84 | // During fast recovery, execute Step 3, 4, 5 of RFC3782\r | |
85 | //\r | |
86 | if (Seg->Ack == Tcb->SndUna) {\r | |
87 | \r | |
88 | //\r | |
89 | // Step 3: Fast Recovery,\r | |
90 | // If this is a duplicated ACK, increse Cwnd by SMSS.\r | |
91 | //\r | |
92 | \r | |
93 | // Step 4 is skipped here only to be executed later\r | |
94 | // by TcpToSendData\r | |
95 | //\r | |
96 | Tcb->CWnd += Tcb->SndMss;\r | |
dea6914d | 97 | DEBUG ((EFI_D_NET, "TcpFastRecover: received another"\r |
0e549d5b | 98 | " duplicated ACK (%d) for TCB %p\n", Seg->Ack, Tcb));\r |
8a67d61d | 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 | |
49789216 | 112 | FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);\r |
8a67d61d | 113 | \r |
36ee91ca | 114 | Tcb->CWnd = MIN (Tcb->Ssthresh, FlightSize + Tcb->SndMss);\r |
8a67d61d | 115 | \r |
116 | Tcb->CongestState = TCP_CONGEST_OPEN;\r | |
dea6914d | 117 | DEBUG ((EFI_D_NET, "TcpFastRecover: received a full ACK(%d)"\r |
0e549d5b | 118 | " for TCB %p, exit fast recovery\n", Seg->Ack, Tcb));\r |
8a67d61d | 119 | \r |
120 | } else {\r | |
121 | \r | |
122 | //\r | |
123 | // Step 5 - Partial ACK:\r | |
124 | // fast retransmit the first unacknowledge field\r | |
125 | // , then deflate the CWnd\r | |
126 | //\r | |
127 | TcpRetransmit (Tcb, Seg->Ack);\r | |
128 | Acked = TCP_SUB_SEQ (Seg->Ack, Tcb->SndUna);\r | |
129 | \r | |
130 | //\r | |
131 | // Deflate the CWnd by the amount of new data\r | |
132 | // ACKed by SEG.ACK. If more than one SMSS data\r | |
133 | // is ACKed, add back SMSS byte to CWnd after\r | |
134 | //\r | |
135 | if (Acked >= Tcb->SndMss) {\r | |
136 | Acked -= Tcb->SndMss;\r | |
137 | \r | |
138 | }\r | |
139 | \r | |
140 | Tcb->CWnd -= Acked;\r | |
141 | \r | |
dea6914d | 142 | DEBUG ((EFI_D_NET, "TcpFastRecover: received a partial"\r |
0e549d5b | 143 | " ACK(%d) for TCB %p\n", Seg->Ack, Tcb));\r |
8a67d61d | 144 | \r |
145 | }\r | |
146 | }\r | |
147 | }\r | |
148 | \r | |
149 | \r | |
150 | /**\r | |
151 | NewReno fast loss recovery, RFC3792.\r | |
152 | \r | |
153 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
154 | @param Seg Segment that triggers the fast loss recovery.\r | |
155 | \r | |
8a67d61d | 156 | **/\r |
157 | VOID\r | |
158 | TcpFastLossRecover (\r | |
77f00155 | 159 | IN OUT TCP_CB *Tcb,\r |
160 | IN TCP_SEG *Seg\r | |
8a67d61d | 161 | )\r |
162 | {\r | |
163 | if (TCP_SEQ_GT (Seg->Ack, Tcb->SndUna)) {\r | |
164 | \r | |
165 | //\r | |
166 | // New data is ACKed, check whether it is a\r | |
167 | // full ACK or partial ACK\r | |
168 | //\r | |
169 | if (TCP_SEQ_GEQ (Seg->Ack, Tcb->LossRecover)) {\r | |
170 | \r | |
171 | //\r | |
172 | // Full ACK: exit the loss recovery.\r | |
173 | //\r | |
174 | Tcb->LossTimes = 0;\r | |
175 | Tcb->CongestState = TCP_CONGEST_OPEN;\r | |
176 | \r | |
dea6914d | 177 | DEBUG ((EFI_D_NET, "TcpFastLossRecover: received a "\r |
0e549d5b | 178 | "full ACK(%d) for TCB %p\n", Seg->Ack, Tcb));\r |
8a67d61d | 179 | \r |
180 | } else {\r | |
181 | \r | |
182 | //\r | |
183 | // Partial ACK:\r | |
184 | // fast retransmit the first unacknowledge field.\r | |
185 | //\r | |
186 | TcpRetransmit (Tcb, Seg->Ack);\r | |
dea6914d | 187 | DEBUG ((EFI_D_NET, "TcpFastLossRecover: received a "\r |
0e549d5b | 188 | "partial ACK(%d) for TCB %p\n", Seg->Ack, Tcb));\r |
8a67d61d | 189 | }\r |
190 | }\r | |
191 | }\r | |
192 | \r | |
193 | \r | |
194 | /**\r | |
120db52c | 195 | Compute the RTT as specified in RFC2988.\r |
8a67d61d | 196 | \r |
197 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
198 | @param Measure Currently measured RTT in heart beats.\r | |
199 | \r | |
8a67d61d | 200 | **/\r |
201 | VOID\r | |
202 | TcpComputeRtt (\r | |
77f00155 | 203 | IN OUT TCP_CB *Tcb,\r |
204 | IN UINT32 Measure\r | |
8a67d61d | 205 | )\r |
206 | {\r | |
207 | INT32 Var;\r | |
208 | \r | |
209 | //\r | |
210 | // Step 2.3: Compute the RTO for subsequent RTT measurement.\r | |
211 | //\r | |
212 | if (Tcb->SRtt != 0) {\r | |
213 | \r | |
214 | Var = Tcb->SRtt - (Measure << TCP_RTT_SHIFT);\r | |
215 | \r | |
216 | if (Var < 0) {\r | |
217 | Var = -Var;\r | |
218 | }\r | |
219 | \r | |
220 | Tcb->RttVar = (3 * Tcb->RttVar + Var) >> 2;\r | |
221 | Tcb->SRtt = 7 * (Tcb->SRtt >> 3) + Measure;\r | |
222 | \r | |
223 | } else {\r | |
224 | //\r | |
225 | // Step 2.2: compute the first RTT measure\r | |
226 | //\r | |
227 | Tcb->SRtt = Measure << TCP_RTT_SHIFT;\r | |
228 | Tcb->RttVar = Measure << (TCP_RTT_SHIFT - 1);\r | |
229 | }\r | |
230 | \r | |
36ee91ca | 231 | Tcb->Rto = (Tcb->SRtt + MAX (8, 4 * Tcb->RttVar)) >> TCP_RTT_SHIFT;\r |
8a67d61d | 232 | \r |
233 | //\r | |
234 | // Step 2.4: Limit the RTO to at least 1 second\r | |
235 | // Step 2.5: Limit the RTO to a maxium value that\r | |
236 | // is at least 60 second\r | |
237 | //\r | |
238 | if (Tcb->Rto < TCP_RTO_MIN) {\r | |
239 | Tcb->Rto = TCP_RTO_MIN;\r | |
240 | \r | |
241 | } else if (Tcb->Rto > TCP_RTO_MAX) {\r | |
242 | Tcb->Rto = TCP_RTO_MAX;\r | |
243 | \r | |
244 | }\r | |
245 | \r | |
dea6914d | 246 | DEBUG ((EFI_D_NET, "TcpComputeRtt: new RTT for TCB %p"\r |
8a67d61d | 247 | " computed SRTT: %d RTTVAR: %d RTO: %d\n",\r |
248 | Tcb, Tcb->SRtt, Tcb->RttVar, Tcb->Rto));\r | |
249 | \r | |
250 | }\r | |
251 | \r | |
252 | \r | |
253 | /**\r | |
120db52c | 254 | Trim the data, SYN and FIN to fit into the window defined by Left and Right.\r |
8a67d61d | 255 | \r |
256 | @param Nbuf Buffer that contains received TCP segment without IP header.\r | |
257 | @param Left The sequence number of the window's left edge.\r | |
258 | @param Right The sequence number of the window's right edge.\r | |
259 | \r | |
8a67d61d | 260 | **/\r |
276dcc1b | 261 | VOID\r |
8a67d61d | 262 | TcpTrimSegment (\r |
263 | IN NET_BUF *Nbuf,\r | |
264 | IN TCP_SEQNO Left,\r | |
265 | IN TCP_SEQNO Right\r | |
266 | )\r | |
267 | {\r | |
268 | TCP_SEG *Seg;\r | |
269 | TCP_SEQNO Urg;\r | |
270 | UINT32 Drop;\r | |
271 | \r | |
272 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
273 | \r | |
274 | //\r | |
275 | // If the segment is completely out of window,\r | |
276 | // truncate every thing, include SYN and FIN.\r | |
277 | //\r | |
278 | if (TCP_SEQ_LEQ (Seg->End, Left) || TCP_SEQ_LEQ (Right, Seg->Seq)) {\r | |
279 | \r | |
280 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_SYN);\r | |
281 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_FIN);\r | |
282 | \r | |
283 | Seg->Seq = Seg->End;\r | |
284 | NetbufTrim (Nbuf, Nbuf->TotalSize, NET_BUF_HEAD);\r | |
c191cdd1 | 285 | return;\r |
8a67d61d | 286 | }\r |
287 | \r | |
288 | //\r | |
289 | // Adjust the buffer header\r | |
290 | //\r | |
291 | if (TCP_SEQ_LT (Seg->Seq, Left)) {\r | |
292 | \r | |
293 | Drop = TCP_SUB_SEQ (Left, Seg->Seq);\r | |
294 | Urg = Seg->Seq + Seg->Urg;\r | |
295 | Seg->Seq = Left;\r | |
296 | \r | |
297 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
298 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_SYN);\r | |
299 | Drop--;\r | |
300 | }\r | |
301 | \r | |
302 | //\r | |
303 | // Adjust the urgent point\r | |
304 | //\r | |
305 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_URG)) {\r | |
306 | \r | |
307 | if (TCP_SEQ_LT (Urg, Seg->Seq)) {\r | |
308 | \r | |
309 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_URG);\r | |
310 | } else {\r | |
311 | Seg->Urg = (UINT16) TCP_SUB_SEQ (Urg, Seg->Seq);\r | |
312 | }\r | |
313 | }\r | |
314 | \r | |
85511ddf | 315 | if (Drop != 0) {\r |
8a67d61d | 316 | NetbufTrim (Nbuf, Drop, NET_BUF_HEAD);\r |
317 | }\r | |
318 | }\r | |
319 | \r | |
320 | //\r | |
321 | // Adjust the buffer tail\r | |
322 | //\r | |
323 | if (TCP_SEQ_GT (Seg->End, Right)) {\r | |
324 | \r | |
325 | Drop = TCP_SUB_SEQ (Seg->End, Right);\r | |
326 | Seg->End = Right;\r | |
327 | \r | |
328 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_FIN)) {\r | |
329 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_FIN);\r | |
330 | Drop--;\r | |
331 | }\r | |
332 | \r | |
85511ddf | 333 | if (Drop != 0) {\r |
8a67d61d | 334 | NetbufTrim (Nbuf, Drop, NET_BUF_TAIL);\r |
335 | }\r | |
336 | }\r | |
337 | \r | |
120db52c | 338 | ASSERT (TcpVerifySegment (Nbuf) != 0);\r |
8a67d61d | 339 | }\r |
340 | \r | |
341 | \r | |
342 | /**\r | |
343 | Trim off the data outside the tcb's receive window.\r | |
344 | \r | |
345 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
346 | @param Nbuf Pointer to the NET_BUF containing the received tcp segment.\r | |
347 | \r | |
8a67d61d | 348 | **/\r |
276dcc1b | 349 | VOID\r |
8a67d61d | 350 | TcpTrimInWnd (\r |
351 | IN TCP_CB *Tcb,\r | |
352 | IN NET_BUF *Nbuf\r | |
353 | )\r | |
354 | {\r | |
276dcc1b | 355 | TcpTrimSegment (Nbuf, Tcb->RcvNxt, Tcb->RcvWl2 + Tcb->RcvWnd);\r |
8a67d61d | 356 | }\r |
357 | \r | |
358 | \r | |
359 | /**\r | |
360 | Process the data and FIN flag, check whether to deliver\r | |
361 | data to the socket layer.\r | |
362 | \r | |
363 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
364 | \r | |
365 | @retval 0 No error occurred to deliver data.\r | |
366 | @retval -1 Error condition occurred. Proper response is to reset the\r | |
367 | connection.\r | |
368 | \r | |
369 | **/\r | |
370 | INTN\r | |
371 | TcpDeliverData (\r | |
77f00155 | 372 | IN OUT TCP_CB *Tcb\r |
8a67d61d | 373 | )\r |
374 | {\r | |
e48e37fc | 375 | LIST_ENTRY *Entry;\r |
8a67d61d | 376 | NET_BUF *Nbuf;\r |
377 | TCP_SEQNO Seq;\r | |
378 | TCP_SEG *Seg;\r | |
379 | UINT32 Urgent;\r | |
380 | \r | |
120db52c | 381 | ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL));\r |
8a67d61d | 382 | \r |
383 | //\r | |
384 | // make sure there is some data queued,\r | |
385 | // and TCP is in a proper state\r | |
386 | //\r | |
e48e37fc | 387 | if (IsListEmpty (&Tcb->RcvQue) || !TCP_CONNECTED (Tcb->State)) {\r |
8a67d61d | 388 | \r |
389 | return 0;\r | |
390 | }\r | |
391 | \r | |
392 | //\r | |
393 | // Deliver data to the socket layer\r | |
394 | //\r | |
395 | Entry = Tcb->RcvQue.ForwardLink;\r | |
396 | Seq = Tcb->RcvNxt;\r | |
397 | \r | |
398 | while (Entry != &Tcb->RcvQue) {\r | |
399 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
400 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
401 | \r | |
120db52c | 402 | ASSERT (TcpVerifySegment (Nbuf) != 0);\r |
8a67d61d | 403 | ASSERT (Nbuf->Tcp == NULL);\r |
404 | \r | |
405 | if (TCP_SEQ_GT (Seg->Seq, Seq)) {\r | |
406 | break;\r | |
407 | }\r | |
408 | \r | |
409 | Entry = Entry->ForwardLink;\r | |
410 | Seq = Seg->End;\r | |
411 | Tcb->RcvNxt = Seq;\r | |
412 | \r | |
e48e37fc | 413 | RemoveEntryList (&Nbuf->List);\r |
8a67d61d | 414 | \r |
415 | //\r | |
416 | // RFC793 Eighth step: process FIN in sequence\r | |
417 | //\r | |
418 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_FIN)) {\r | |
419 | \r | |
420 | //\r | |
421 | // The peer sends to us junky data after FIN,\r | |
422 | // reset the connection.\r | |
423 | //\r | |
e48e37fc | 424 | if (!IsListEmpty (&Tcb->RcvQue)) {\r |
425 | DEBUG ((EFI_D_ERROR, "TcpDeliverData: data received after"\r | |
0e549d5b | 426 | " FIN from peer of TCB %p, reset connection\n", Tcb));\r |
8a67d61d | 427 | \r |
428 | NetbufFree (Nbuf);\r | |
429 | return -1;\r | |
430 | }\r | |
431 | \r | |
dea6914d | 432 | DEBUG ((EFI_D_NET, "TcpDeliverData: processing FIN "\r |
0e549d5b | 433 | "from peer of TCB %p\n", Tcb));\r |
8a67d61d | 434 | \r |
435 | switch (Tcb->State) {\r | |
436 | case TCP_SYN_RCVD:\r | |
437 | case TCP_ESTABLISHED:\r | |
438 | \r | |
439 | TcpSetState (Tcb, TCP_CLOSE_WAIT);\r | |
440 | break;\r | |
441 | \r | |
442 | case TCP_FIN_WAIT_1:\r | |
443 | \r | |
444 | if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
445 | \r | |
446 | TcpSetState (Tcb, TCP_CLOSING);\r | |
447 | break;\r | |
448 | }\r | |
449 | \r | |
450 | //\r | |
451 | // fall through\r | |
452 | //\r | |
453 | case TCP_FIN_WAIT_2:\r | |
454 | \r | |
455 | TcpSetState (Tcb, TCP_TIME_WAIT);\r | |
456 | TcpClearAllTimer (Tcb);\r | |
457 | \r | |
458 | if (Tcb->TimeWaitTimeout != 0) {\r | |
459 | \r | |
460 | TcpSetTimer (Tcb, TCP_TIMER_2MSL, Tcb->TimeWaitTimeout);\r | |
461 | } else {\r | |
462 | \r | |
e48e37fc | 463 | DEBUG ((EFI_D_WARN, "Connection closed immediately "\r |
0e549d5b | 464 | "because app disables TIME_WAIT timer for %p\n", Tcb));\r |
8a67d61d | 465 | \r |
466 | TcpSendAck (Tcb);\r | |
467 | TcpClose (Tcb);\r | |
468 | }\r | |
469 | break;\r | |
470 | \r | |
471 | case TCP_CLOSE_WAIT:\r | |
472 | case TCP_CLOSING:\r | |
473 | case TCP_LAST_ACK:\r | |
474 | case TCP_TIME_WAIT:\r | |
475 | //\r | |
476 | // The peer sends to us junk FIN byte. Discard\r | |
477 | // the buffer then reset the connection\r | |
478 | //\r | |
479 | NetbufFree (Nbuf);\r | |
480 | return -1;\r | |
dfa596b8 | 481 | default:\r |
dfc1f033 | 482 | break;\r |
8a67d61d | 483 | }\r |
484 | \r | |
485 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
486 | \r | |
487 | Seg->End--;\r | |
488 | }\r | |
489 | \r | |
490 | //\r | |
491 | // Don't delay the ack if PUSH flag is on.\r | |
492 | //\r | |
493 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_PSH)) {\r | |
494 | \r | |
495 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
496 | }\r | |
497 | \r | |
52b2a308 | 498 | if (Nbuf->TotalSize != 0) {\r |
8a67d61d | 499 | Urgent = 0;\r |
500 | \r | |
501 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_URG) &&\r | |
502 | TCP_SEQ_LEQ (Seg->Seq, Tcb->RcvUp)) {\r | |
503 | \r | |
504 | if (TCP_SEQ_LEQ (Seg->End, Tcb->RcvUp)) {\r | |
505 | Urgent = Nbuf->TotalSize;\r | |
506 | } else {\r | |
507 | Urgent = TCP_SUB_SEQ (Tcb->RcvUp, Seg->Seq) + 1;\r | |
508 | }\r | |
509 | }\r | |
510 | \r | |
511 | SockDataRcvd (Tcb->Sk, Nbuf, Urgent);\r | |
512 | }\r | |
513 | \r | |
514 | if (TCP_FIN_RCVD (Tcb->State)) {\r | |
515 | \r | |
516 | SockNoMoreData (Tcb->Sk);\r | |
517 | }\r | |
518 | \r | |
519 | NetbufFree (Nbuf);\r | |
520 | }\r | |
521 | \r | |
522 | return 0;\r | |
523 | }\r | |
524 | \r | |
525 | \r | |
526 | /**\r | |
527 | Store the data into the reassemble queue.\r | |
528 | \r | |
529 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
530 | @param Nbuf Pointer to the buffer containing the data to be queued.\r | |
531 | \r | |
8a67d61d | 532 | **/\r |
533 | VOID\r | |
534 | TcpQueueData (\r | |
77f00155 | 535 | IN OUT TCP_CB *Tcb,\r |
536 | IN NET_BUF *Nbuf\r | |
8a67d61d | 537 | )\r |
538 | {\r | |
539 | TCP_SEG *Seg;\r | |
e48e37fc | 540 | LIST_ENTRY *Head;\r |
541 | LIST_ENTRY *Prev;\r | |
542 | LIST_ENTRY *Cur;\r | |
8a67d61d | 543 | NET_BUF *Node;\r |
544 | \r | |
120db52c | 545 | ASSERT ((Tcb != NULL) && (Nbuf != NULL) && (Nbuf->Tcp == NULL));\r |
8a67d61d | 546 | \r |
547 | NET_GET_REF (Nbuf);\r | |
548 | \r | |
549 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
550 | Head = &Tcb->RcvQue;\r | |
551 | \r | |
552 | //\r | |
553 | // Fast path to process normal case. That is,\r | |
554 | // no out-of-order segments are received.\r | |
555 | //\r | |
e48e37fc | 556 | if (IsListEmpty (Head)) {\r |
8a67d61d | 557 | \r |
e48e37fc | 558 | InsertTailList (Head, &Nbuf->List);\r |
49789216 | 559 | return;\r |
8a67d61d | 560 | }\r |
561 | \r | |
562 | //\r | |
563 | // Find the point to insert the buffer\r | |
564 | //\r | |
565 | for (Prev = Head, Cur = Head->ForwardLink;\r | |
49789216 BZ |
566 | Cur != Head;\r |
567 | Prev = Cur, Cur = Cur->ForwardLink) {\r | |
8a67d61d | 568 | \r |
569 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
570 | \r | |
571 | if (TCP_SEQ_LT (Seg->Seq, TCPSEG_NETBUF (Node)->Seq)) {\r | |
572 | break;\r | |
573 | }\r | |
574 | }\r | |
575 | \r | |
576 | //\r | |
577 | // Check whether the current segment overlaps with the\r | |
578 | // previous segment.\r | |
579 | //\r | |
580 | if (Prev != Head) {\r | |
581 | Node = NET_LIST_USER_STRUCT (Prev, NET_BUF, List);\r | |
582 | \r | |
583 | if (TCP_SEQ_LT (Seg->Seq, TCPSEG_NETBUF (Node)->End)) {\r | |
584 | \r | |
585 | if (TCP_SEQ_LEQ (Seg->End, TCPSEG_NETBUF (Node)->End)) {\r | |
586 | \r | |
587 | NetbufFree (Nbuf);\r | |
49789216 | 588 | return;\r |
8a67d61d | 589 | }\r |
590 | \r | |
591 | TcpTrimSegment (Nbuf, TCPSEG_NETBUF (Node)->End, Seg->End);\r | |
592 | }\r | |
593 | }\r | |
594 | \r | |
e48e37fc | 595 | InsertHeadList (Prev, &Nbuf->List);\r |
8a67d61d | 596 | \r |
597 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
598 | \r | |
599 | //\r | |
600 | // Check the segments after the insert point.\r | |
601 | //\r | |
602 | while (Cur != Head) {\r | |
603 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
604 | \r | |
605 | if (TCP_SEQ_LEQ (TCPSEG_NETBUF (Node)->End, Seg->End)) {\r | |
606 | \r | |
607 | Cur = Cur->ForwardLink;\r | |
608 | \r | |
e48e37fc | 609 | RemoveEntryList (&Node->List);\r |
8a67d61d | 610 | NetbufFree (Node);\r |
611 | continue;\r | |
612 | }\r | |
613 | \r | |
614 | if (TCP_SEQ_LT (TCPSEG_NETBUF (Node)->Seq, Seg->End)) {\r | |
615 | \r | |
616 | if (TCP_SEQ_LEQ (TCPSEG_NETBUF (Node)->Seq, Seg->Seq)) {\r | |
617 | \r | |
e48e37fc | 618 | RemoveEntryList (&Nbuf->List);\r |
8a67d61d | 619 | NetbufFree (Nbuf);\r |
620 | return ;\r | |
621 | }\r | |
622 | \r | |
623 | TcpTrimSegment (Nbuf, Seg->Seq, TCPSEG_NETBUF (Node)->Seq);\r | |
624 | break;\r | |
625 | }\r | |
626 | \r | |
627 | Cur = Cur->ForwardLink;\r | |
628 | }\r | |
629 | }\r | |
630 | \r | |
631 | \r | |
632 | /**\r | |
633 | Ajust the send queue or the retransmit queue.\r | |
634 | \r | |
635 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
636 | @param Ack The acknowledge seuqence number of the received segment.\r | |
637 | \r | |
8a67d61d | 638 | **/\r |
639 | VOID\r | |
640 | TcpAdjustSndQue (\r | |
641 | IN TCP_CB *Tcb,\r | |
642 | IN TCP_SEQNO Ack\r | |
643 | )\r | |
644 | {\r | |
e48e37fc | 645 | LIST_ENTRY *Head;\r |
646 | LIST_ENTRY *Cur;\r | |
8a67d61d | 647 | NET_BUF *Node;\r |
648 | TCP_SEG *Seg;\r | |
649 | \r | |
650 | Head = &Tcb->SndQue;\r | |
651 | Cur = Head->ForwardLink;\r | |
652 | \r | |
653 | while (Cur != Head) {\r | |
654 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
655 | Seg = TCPSEG_NETBUF (Node);\r | |
656 | \r | |
657 | if (TCP_SEQ_GEQ (Seg->Seq, Ack)) {\r | |
658 | break;\r | |
659 | }\r | |
660 | \r | |
661 | //\r | |
662 | // Remove completely ACKed segments\r | |
663 | //\r | |
664 | if (TCP_SEQ_LEQ (Seg->End, Ack)) {\r | |
665 | Cur = Cur->ForwardLink;\r | |
666 | \r | |
e48e37fc | 667 | RemoveEntryList (&Node->List);\r |
8a67d61d | 668 | NetbufFree (Node);\r |
669 | continue;\r | |
670 | }\r | |
671 | \r | |
672 | TcpTrimSegment (Node, Ack, Seg->End);\r | |
673 | break;\r | |
674 | }\r | |
675 | }\r | |
676 | \r | |
677 | \r | |
678 | /**\r | |
679 | Process the received TCP segments.\r | |
680 | \r | |
681 | @param Nbuf Buffer that contains received TCP segment without IP header.\r | |
682 | @param Src Source address of the segment, or the peer's IP address.\r | |
683 | @param Dst Destination address of the segment, or the local end's IP\r | |
684 | address.\r | |
685 | \r | |
686 | @retval 0 Segment is processed successfully. It is either accepted or\r | |
687 | discarded. But no connection is reset by the segment.\r | |
688 | @retval -1 A connection is reset by the segment.\r | |
689 | \r | |
690 | **/\r | |
691 | INTN\r | |
692 | TcpInput (\r | |
693 | IN NET_BUF *Nbuf,\r | |
694 | IN UINT32 Src,\r | |
695 | IN UINT32 Dst\r | |
696 | )\r | |
697 | {\r | |
698 | TCP_CB *Tcb;\r | |
699 | TCP_CB *Parent;\r | |
700 | TCP_OPTION Option;\r | |
701 | TCP_HEAD *Head;\r | |
702 | INT32 Len;\r | |
703 | TCP_SEG *Seg;\r | |
704 | TCP_SEQNO Right;\r | |
705 | TCP_SEQNO Urg;\r | |
207b3d2b | 706 | INT32 Usable;\r |
d1102dba | 707 | \r |
8a67d61d | 708 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r |
709 | \r | |
710 | Parent = NULL;\r | |
711 | Tcb = NULL;\r | |
712 | \r | |
713 | Head = (TCP_HEAD *) NetbufGetByte (Nbuf, 0, NULL);\r | |
a56b6e03 | 714 | ASSERT (Head != NULL);\r |
1b31acb6 FS |
715 | \r |
716 | if (Nbuf->TotalSize < sizeof (TCP_HEAD)) {\r | |
dea6914d | 717 | DEBUG ((EFI_D_NET, "TcpInput: received a malformed packet\n"));\r |
1b31acb6 FS |
718 | goto DISCARD;\r |
719 | }\r | |
d1102dba | 720 | \r |
8a67d61d | 721 | Len = Nbuf->TotalSize - (Head->HeadLen << 2);\r |
722 | \r | |
723 | if ((Head->HeadLen < 5) || (Len < 0) ||\r | |
85511ddf | 724 | (TcpChecksum (Nbuf, NetPseudoHeadChecksum (Src, Dst, 6, 0)) != 0)) {\r |
8a67d61d | 725 | \r |
dea6914d | 726 | DEBUG ((EFI_D_NET, "TcpInput: received a malformed packet\n"));\r |
8a67d61d | 727 | goto DISCARD;\r |
728 | }\r | |
729 | \r | |
730 | if (TCP_FLG_ON (Head->Flag, TCP_FLG_SYN)) {\r | |
731 | Len++;\r | |
732 | }\r | |
733 | \r | |
734 | if (TCP_FLG_ON (Head->Flag, TCP_FLG_FIN)) {\r | |
735 | Len++;\r | |
736 | }\r | |
737 | \r | |
738 | Tcb = TcpLocateTcb (\r | |
739 | Head->DstPort,\r | |
740 | Dst,\r | |
741 | Head->SrcPort,\r | |
742 | Src,\r | |
743 | (BOOLEAN) TCP_FLG_ON (Head->Flag, TCP_FLG_SYN)\r | |
744 | );\r | |
745 | \r | |
746 | if ((Tcb == NULL) || (Tcb->State == TCP_CLOSED)) {\r | |
dea6914d | 747 | DEBUG ((EFI_D_NET, "TcpInput: send reset because no TCB found\n"));\r |
8a67d61d | 748 | \r |
749 | Tcb = NULL;\r | |
750 | goto SEND_RESET;\r | |
751 | }\r | |
752 | \r | |
753 | Seg = TcpFormatNetbuf (Tcb, Nbuf);\r | |
754 | \r | |
755 | //\r | |
756 | // RFC1122 recommended reaction to illegal option\r | |
757 | // (in fact, an illegal option length) is reset.\r | |
758 | //\r | |
759 | if (TcpParseOption (Nbuf->Tcp, &Option) == -1) {\r | |
e48e37fc | 760 | DEBUG ((EFI_D_ERROR, "TcpInput: reset the peer because"\r |
49789216 | 761 | " of malformed option for TCB %p\n", Tcb));\r |
8a67d61d | 762 | \r |
763 | goto SEND_RESET;\r | |
764 | }\r | |
765 | \r | |
766 | //\r | |
767 | // From now on, the segment is headless\r | |
768 | //\r | |
769 | NetbufTrim (Nbuf, (Head->HeadLen << 2), NET_BUF_HEAD);\r | |
770 | Nbuf->Tcp = NULL;\r | |
771 | \r | |
8a67d61d | 772 | //\r |
773 | // Process the segment in LISTEN state.\r | |
774 | //\r | |
775 | if (Tcb->State == TCP_LISTEN) {\r | |
776 | //\r | |
777 | // First step: Check RST\r | |
778 | //\r | |
779 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
e48e37fc | 780 | DEBUG ((EFI_D_WARN, "TcpInput: discard a reset segment "\r |
0e549d5b | 781 | "for TCB %p in listening\n", Tcb));\r |
8a67d61d | 782 | \r |
783 | goto DISCARD;\r | |
784 | }\r | |
785 | \r | |
786 | //\r | |
787 | // Second step: Check ACK.\r | |
788 | // Any ACK sent to TCP in LISTEN is reseted.\r | |
789 | //\r | |
790 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
e48e37fc | 791 | DEBUG ((EFI_D_WARN, "TcpInput: send reset because of"\r |
0e549d5b | 792 | " segment with ACK for TCB %p in listening\n", Tcb));\r |
8a67d61d | 793 | \r |
794 | goto SEND_RESET;\r | |
795 | }\r | |
796 | \r | |
797 | //\r | |
798 | // Third step: Check SYN\r | |
799 | //\r | |
800 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
801 | //\r | |
802 | // create a child TCB to handle the data\r | |
803 | //\r | |
804 | Parent = Tcb;\r | |
805 | \r | |
806 | Tcb = TcpCloneTcb (Parent);\r | |
807 | if (Tcb == NULL) {\r | |
e48e37fc | 808 | DEBUG ((EFI_D_ERROR, "TcpInput: discard a segment because"\r |
49789216 | 809 | " failed to clone a child for TCB %p\n", Tcb));\r |
8a67d61d | 810 | \r |
811 | goto DISCARD;\r | |
812 | }\r | |
813 | \r | |
dea6914d | 814 | DEBUG ((EFI_D_NET, "TcpInput: create a child for TCB %p"\r |
8a67d61d | 815 | " in listening\n", Tcb));\r |
816 | \r | |
817 | //\r | |
818 | // init the TCB structure\r | |
819 | //\r | |
820 | Tcb->LocalEnd.Ip = Dst;\r | |
821 | Tcb->LocalEnd.Port = Head->DstPort;\r | |
822 | Tcb->RemoteEnd.Ip = Src;\r | |
823 | Tcb->RemoteEnd.Port = Head->SrcPort;\r | |
824 | \r | |
825 | TcpInitTcbLocal (Tcb);\r | |
826 | TcpInitTcbPeer (Tcb, Seg, &Option);\r | |
827 | \r | |
828 | TcpSetState (Tcb, TCP_SYN_RCVD);\r | |
829 | TcpSetTimer (Tcb, TCP_TIMER_CONNECT, Tcb->ConnectTimeout);\r | |
830 | TcpTrimInWnd (Tcb, Nbuf);\r | |
831 | \r | |
832 | goto StepSix;\r | |
833 | }\r | |
834 | \r | |
835 | goto DISCARD;\r | |
836 | \r | |
837 | } else if (Tcb->State == TCP_SYN_SENT) {\r | |
838 | //\r | |
839 | // First step: Check ACK bit\r | |
840 | //\r | |
841 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK) && (Seg->Ack != Tcb->Iss + 1)) {\r | |
842 | \r | |
e48e37fc | 843 | DEBUG ((EFI_D_WARN, "TcpInput: send reset because of "\r |
0e549d5b | 844 | "wrong ACK received for TCB %p in SYN_SENT\n", Tcb));\r |
8a67d61d | 845 | \r |
846 | goto SEND_RESET;\r | |
847 | }\r | |
848 | \r | |
849 | //\r | |
850 | // Second step: Check RST bit\r | |
851 | //\r | |
852 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
853 | \r | |
854 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
855 | \r | |
e48e37fc | 856 | DEBUG ((EFI_D_WARN, "TcpInput: connection reset by"\r |
dfc1f033 | 857 | " peer for TCB %p in SYN_SENT\n", Tcb));\r |
8a67d61d | 858 | \r |
859 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_RESET);\r | |
860 | goto DROP_CONNECTION;\r | |
861 | } else {\r | |
862 | \r | |
e48e37fc | 863 | DEBUG ((EFI_D_WARN, "TcpInput: discard a reset segment "\r |
dfc1f033 | 864 | "because of no ACK for TCB %p in SYN_SENT\n", Tcb));\r |
8a67d61d | 865 | \r |
866 | goto DISCARD;\r | |
867 | }\r | |
868 | }\r | |
869 | \r | |
870 | //\r | |
871 | // Third step: Check security and precedence. Skipped\r | |
872 | //\r | |
873 | \r | |
874 | //\r | |
49789216 | 875 | // Fourth step: Check SYN. Pay attention to simultaneous open\r |
8a67d61d | 876 | //\r |
877 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
878 | \r | |
879 | TcpInitTcbPeer (Tcb, Seg, &Option);\r | |
880 | \r | |
881 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
882 | \r | |
883 | Tcb->SndUna = Seg->Ack;\r | |
884 | }\r | |
885 | \r | |
886 | TcpClearTimer (Tcb, TCP_TIMER_REXMIT);\r | |
887 | \r | |
888 | if (TCP_SEQ_GT (Tcb->SndUna, Tcb->Iss)) {\r | |
889 | \r | |
890 | TcpSetState (Tcb, TCP_ESTABLISHED);\r | |
891 | \r | |
892 | TcpClearTimer (Tcb, TCP_TIMER_CONNECT);\r | |
893 | TcpDeliverData (Tcb);\r | |
894 | \r | |
895 | if ((Tcb->CongestState == TCP_CONGEST_OPEN) &&\r | |
896 | TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RTT_ON)) {\r | |
897 | \r | |
898 | TcpComputeRtt (Tcb, Tcb->RttMeasure);\r | |
899 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
900 | }\r | |
901 | \r | |
902 | TcpTrimInWnd (Tcb, Nbuf);\r | |
903 | \r | |
904 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
905 | \r | |
dea6914d | 906 | DEBUG ((EFI_D_NET, "TcpInput: connection established"\r |
0e549d5b | 907 | " for TCB %p in SYN_SENT\n", Tcb));\r |
8a67d61d | 908 | \r |
909 | goto StepSix;\r | |
910 | } else {\r | |
911 | //\r | |
49789216 | 912 | // Received a SYN segment without ACK, simultaneous open.\r |
8a67d61d | 913 | //\r |
914 | TcpSetState (Tcb, TCP_SYN_RCVD);\r | |
915 | \r | |
916 | ASSERT (Tcb->SndNxt == Tcb->Iss + 1);\r | |
917 | TcpAdjustSndQue (Tcb, Tcb->SndNxt);\r | |
918 | \r | |
919 | TcpTrimInWnd (Tcb, Nbuf);\r | |
920 | \r | |
49789216 | 921 | DEBUG ((EFI_D_WARN, "TcpInput: simultaneous open "\r |
0e549d5b | 922 | "for TCB %p in SYN_SENT\n", Tcb));\r |
8a67d61d | 923 | \r |
924 | goto StepSix;\r | |
925 | }\r | |
926 | }\r | |
927 | \r | |
928 | goto DISCARD;\r | |
929 | }\r | |
930 | \r | |
931 | //\r | |
932 | // Process segment in SYN_RCVD or TCP_CONNECTED states\r | |
933 | //\r | |
934 | \r | |
ac8cca2a | 935 | //\r |
936 | // Clear probe timer since the RecvWindow is opened.\r | |
937 | //\r | |
938 | if (Tcb->ProbeTimerOn && (Seg->Wnd != 0)) {\r | |
939 | TcpClearTimer (Tcb, TCP_TIMER_PROBE);\r | |
940 | Tcb->ProbeTimerOn = FALSE;\r | |
941 | }\r | |
942 | \r | |
8a67d61d | 943 | //\r |
944 | // First step: Check whether SEG.SEQ is acceptable\r | |
945 | //\r | |
85511ddf | 946 | if (TcpSeqAcceptable (Tcb, Seg) == 0) {\r |
e48e37fc | 947 | DEBUG ((EFI_D_WARN, "TcpInput: sequence acceptance"\r |
0e549d5b | 948 | " test failed for segment of TCB %p\n", Tcb));\r |
8a67d61d | 949 | \r |
950 | if (!TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
951 | TcpSendAck (Tcb);\r | |
952 | }\r | |
953 | \r | |
954 | goto DISCARD;\r | |
955 | }\r | |
956 | \r | |
957 | if ((TCP_SEQ_LT (Seg->Seq, Tcb->RcvWl2)) &&\r | |
958 | (Tcb->RcvWl2 == Seg->End) &&\r | |
959 | !TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN | TCP_FLG_FIN)) {\r | |
960 | \r | |
961 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
962 | }\r | |
963 | \r | |
964 | //\r | |
965 | // Second step: Check the RST\r | |
966 | //\r | |
967 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_RST)) {\r | |
968 | \r | |
0e549d5b | 969 | DEBUG ((EFI_D_WARN, "TcpInput: connection reset for TCB %p\n", Tcb));\r |
8a67d61d | 970 | \r |
971 | if (Tcb->State == TCP_SYN_RCVD) {\r | |
972 | \r | |
973 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_REFUSED);\r | |
974 | \r | |
975 | //\r | |
976 | // This TCB comes from either a LISTEN TCB,\r | |
977 | // or active open TCB with simultanous open.\r | |
978 | // Do NOT signal user CONNECTION refused\r | |
979 | // if it comes from a LISTEN TCB.\r | |
980 | //\r | |
981 | } else if ((Tcb->State == TCP_ESTABLISHED) ||\r | |
120db52c | 982 | (Tcb->State == TCP_FIN_WAIT_1) ||\r |
983 | (Tcb->State == TCP_FIN_WAIT_2) ||\r | |
984 | (Tcb->State == TCP_CLOSE_WAIT)) {\r | |
8a67d61d | 985 | \r |
986 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_RESET);\r | |
987 | \r | |
988 | } else {\r | |
dfc1f033 | 989 | \r |
8a67d61d | 990 | }\r |
991 | \r | |
992 | goto DROP_CONNECTION;\r | |
993 | }\r | |
994 | \r | |
995 | //\r | |
996 | // Trim the data and flags.\r | |
997 | //\r | |
998 | TcpTrimInWnd (Tcb, Nbuf);\r | |
999 | \r | |
1000 | //\r | |
1001 | // Third step: Check security and precedence, Ignored\r | |
1002 | //\r | |
1003 | \r | |
1004 | //\r | |
1005 | // Fourth step: Check the SYN bit.\r | |
1006 | //\r | |
1007 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
1008 | \r | |
e48e37fc | 1009 | DEBUG ((EFI_D_WARN, "TcpInput: connection reset "\r |
0e549d5b | 1010 | "because received extra SYN for TCB %p\n", Tcb));\r |
8a67d61d | 1011 | \r |
1012 | SOCK_ERROR (Tcb->Sk, EFI_CONNECTION_RESET);\r | |
1013 | goto RESET_THEN_DROP;\r | |
1014 | }\r | |
1015 | \r | |
1016 | //\r | |
1017 | // Fifth step: Check the ACK\r | |
1018 | //\r | |
1019 | if (!TCP_FLG_ON (Seg->Flag, TCP_FLG_ACK)) {\r | |
e48e37fc | 1020 | DEBUG ((EFI_D_WARN, "TcpInput: segment discard because"\r |
0e549d5b | 1021 | " of no ACK for connected TCB %p\n", Tcb));\r |
8a67d61d | 1022 | \r |
1023 | goto DISCARD;\r | |
1024 | \r | |
1025 | }\r | |
1026 | \r | |
1027 | if (Tcb->State == TCP_SYN_RCVD) {\r | |
1028 | \r | |
1029 | if (TCP_SEQ_LT (Tcb->SndUna, Seg->Ack) &&\r | |
1030 | TCP_SEQ_LEQ (Seg->Ack, Tcb->SndNxt)) {\r | |
1031 | \r | |
1032 | Tcb->SndWnd = Seg->Wnd;\r | |
36ee91ca | 1033 | Tcb->SndWndMax = MAX (Tcb->SndWnd, Tcb->SndWndMax);\r |
8a67d61d | 1034 | Tcb->SndWl1 = Seg->Seq;\r |
1035 | Tcb->SndWl2 = Seg->Ack;\r | |
1036 | TcpSetState (Tcb, TCP_ESTABLISHED);\r | |
1037 | \r | |
1038 | TcpClearTimer (Tcb, TCP_TIMER_CONNECT);\r | |
1039 | TcpDeliverData (Tcb);\r | |
1040 | \r | |
dea6914d | 1041 | DEBUG ((EFI_D_NET, "TcpInput: connection established "\r |
0e549d5b | 1042 | " for TCB %p in SYN_RCVD\n", Tcb));\r |
8a67d61d | 1043 | \r |
1044 | //\r | |
1045 | // Continue the process as ESTABLISHED state\r | |
1046 | //\r | |
1047 | } else {\r | |
e48e37fc | 1048 | DEBUG ((EFI_D_WARN, "TcpInput: send reset because of"\r |
0e549d5b | 1049 | " wrong ACK for TCB %p in SYN_RCVD\n", Tcb));\r |
8a67d61d | 1050 | \r |
1051 | goto SEND_RESET;\r | |
1052 | }\r | |
1053 | }\r | |
1054 | \r | |
1055 | if (TCP_SEQ_LT (Seg->Ack, Tcb->SndUna)) {\r | |
1056 | \r | |
e48e37fc | 1057 | DEBUG ((EFI_D_WARN, "TcpInput: ignore the out-of-data"\r |
0e549d5b | 1058 | " ACK for connected TCB %p\n", Tcb));\r |
8a67d61d | 1059 | \r |
1060 | goto StepSix;\r | |
1061 | \r | |
1062 | } else if (TCP_SEQ_GT (Seg->Ack, Tcb->SndNxt)) {\r | |
1063 | \r | |
e48e37fc | 1064 | DEBUG ((EFI_D_WARN, "TcpInput: discard segment for "\r |
0e549d5b | 1065 | "future ACK for connected TCB %p\n", Tcb));\r |
8a67d61d | 1066 | \r |
1067 | TcpSendAck (Tcb);\r | |
1068 | goto DISCARD;\r | |
1069 | }\r | |
1070 | \r | |
1071 | //\r | |
1072 | // From now on: SND.UNA <= SEG.ACK <= SND.NXT.\r | |
1073 | //\r | |
1074 | if (TCP_FLG_ON (Option.Flag, TCP_OPTION_RCVD_TS)) {\r | |
1075 | //\r | |
1076 | // update TsRecent as specified in page 16 RFC1323.\r | |
1077 | // RcvWl2 equals to the variable "LastAckSent"\r | |
1078 | // defined there.\r | |
1079 | //\r | |
1080 | if (TCP_SEQ_LEQ (Seg->Seq, Tcb->RcvWl2) &&\r | |
1081 | TCP_SEQ_LT (Tcb->RcvWl2, Seg->End)) {\r | |
1082 | \r | |
1083 | Tcb->TsRecent = Option.TSVal;\r | |
1084 | Tcb->TsRecentAge = mTcpTick;\r | |
1085 | }\r | |
1086 | \r | |
1087 | TcpComputeRtt (Tcb, TCP_SUB_TIME (mTcpTick, Option.TSEcr));\r | |
1088 | \r | |
1089 | } else if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RTT_ON)) {\r | |
1090 | \r | |
1091 | ASSERT (Tcb->CongestState == TCP_CONGEST_OPEN);\r | |
1092 | \r | |
1093 | TcpComputeRtt (Tcb, Tcb->RttMeasure);\r | |
1094 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
1095 | }\r | |
1096 | \r | |
1097 | if (Seg->Ack == Tcb->SndNxt) {\r | |
1098 | \r | |
1099 | TcpClearTimer (Tcb, TCP_TIMER_REXMIT);\r | |
1100 | } else {\r | |
1101 | \r | |
1102 | TcpSetTimer (Tcb, TCP_TIMER_REXMIT, Tcb->Rto);\r | |
1103 | }\r | |
1104 | \r | |
1105 | //\r | |
1106 | // Count duplicate acks.\r | |
1107 | //\r | |
1108 | if ((Seg->Ack == Tcb->SndUna) &&\r | |
1109 | (Tcb->SndUna != Tcb->SndNxt) &&\r | |
1110 | (Seg->Wnd == Tcb->SndWnd) &&\r | |
1111 | (0 == Len)) {\r | |
1112 | \r | |
1113 | Tcb->DupAck++;\r | |
1114 | } else {\r | |
1115 | \r | |
1116 | Tcb->DupAck = 0;\r | |
1117 | }\r | |
1118 | \r | |
1119 | //\r | |
1120 | // Congestion avoidance, fast recovery and fast retransmission.\r | |
1121 | //\r | |
1122 | if (((Tcb->CongestState == TCP_CONGEST_OPEN) && (Tcb->DupAck < 3)) ||\r | |
1123 | (Tcb->CongestState == TCP_CONGEST_LOSS)) {\r | |
1124 | \r | |
1125 | if (TCP_SEQ_GT (Seg->Ack, Tcb->SndUna)) {\r | |
1126 | \r | |
1127 | if (Tcb->CWnd < Tcb->Ssthresh) {\r | |
1128 | \r | |
1129 | Tcb->CWnd += Tcb->SndMss;\r | |
1130 | } else {\r | |
1131 | \r | |
36ee91ca | 1132 | Tcb->CWnd += MAX (Tcb->SndMss * Tcb->SndMss / Tcb->CWnd, 1);\r |
8a67d61d | 1133 | }\r |
1134 | \r | |
36ee91ca | 1135 | Tcb->CWnd = MIN (Tcb->CWnd, TCP_MAX_WIN << Tcb->SndWndScale);\r |
8a67d61d | 1136 | }\r |
1137 | \r | |
1138 | if (Tcb->CongestState == TCP_CONGEST_LOSS) {\r | |
1139 | TcpFastLossRecover (Tcb, Seg);\r | |
1140 | }\r | |
1141 | } else {\r | |
1142 | \r | |
1143 | TcpFastRecover (Tcb, Seg);\r | |
1144 | }\r | |
1145 | \r | |
1146 | if (TCP_SEQ_GT (Seg->Ack, Tcb->SndUna)) {\r | |
1147 | \r | |
1148 | TcpAdjustSndQue (Tcb, Seg->Ack);\r | |
1149 | Tcb->SndUna = Seg->Ack;\r | |
1150 | \r | |
1151 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_SND_URG) &&\r | |
120db52c | 1152 | TCP_SEQ_LT (Tcb->SndUp, Seg->Ack)) {\r |
8a67d61d | 1153 | \r |
1154 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_SND_URG);\r | |
1155 | }\r | |
1156 | }\r | |
1157 | \r | |
1158 | //\r | |
1159 | // Update window info\r | |
1160 | //\r | |
1161 | if (TCP_SEQ_LT (Tcb->SndWl1, Seg->Seq) ||\r | |
1162 | ((Tcb->SndWl1 == Seg->Seq) && TCP_SEQ_LEQ (Tcb->SndWl2, Seg->Ack))) {\r | |
1163 | \r | |
1164 | Right = Seg->Ack + Seg->Wnd;\r | |
1165 | \r | |
1166 | if (TCP_SEQ_LT (Right, Tcb->SndWl2 + Tcb->SndWnd)) {\r | |
1167 | \r | |
1168 | if ((Tcb->SndWl1 == Seg->Seq) &&\r | |
1169 | (Tcb->SndWl2 == Seg->Ack) &&\r | |
1170 | (Len == 0)) {\r | |
1171 | \r | |
1172 | goto NO_UPDATE;\r | |
1173 | }\r | |
1174 | \r | |
e48e37fc | 1175 | DEBUG ((EFI_D_WARN, "TcpInput: peer shrinks the"\r |
dfc1f033 | 1176 | " window for connected TCB %p\n", Tcb));\r |
8a67d61d | 1177 | \r |
1178 | if ((Tcb->CongestState == TCP_CONGEST_RECOVER) &&\r | |
1179 | (TCP_SEQ_LT (Right, Tcb->Recover))) {\r | |
1180 | \r | |
1181 | Tcb->Recover = Right;\r | |
1182 | }\r | |
1183 | \r | |
1184 | if ((Tcb->CongestState == TCP_CONGEST_LOSS) &&\r | |
1185 | (TCP_SEQ_LT (Right, Tcb->LossRecover))) {\r | |
1186 | \r | |
1187 | Tcb->LossRecover = Right;\r | |
1188 | }\r | |
1189 | \r | |
1190 | if (TCP_SEQ_LT (Right, Tcb->SndNxt)) {\r | |
207b3d2b FS |
1191 | //\r |
1192 | // Check for Window Retraction in RFC7923 section 2.4.\r | |
1193 | // The lower n bits of the peer's actual receive window is wiped out if TCP\r | |
1194 | // window scale is enabled, it will look like the peer is shrinking the window.\r | |
1195 | // Check whether the SndNxt is out of the advertised receive window by more than\r | |
1196 | // 2^Rcv.Wind.Shift before moving the SndNxt to the left.\r | |
1197 | //\r | |
1198 | DEBUG (\r | |
1199 | (EFI_D_WARN,\r | |
1200 | "TcpInput: peer advise negative useable window for connected TCB %p\n",\r | |
1201 | Tcb)\r | |
1202 | );\r | |
1203 | Usable = TCP_SUB_SEQ (Tcb->SndNxt, Right);\r | |
1204 | if ((Usable >> Tcb->SndWndScale) > 0) {\r | |
1205 | DEBUG (\r | |
1206 | (EFI_D_WARN,\r | |
1207 | "TcpInput: SndNxt is out of window by more than window scale for TCB %p\n",\r | |
1208 | Tcb)\r | |
1209 | );\r | |
1210 | Tcb->SndNxt = Right;\r | |
1211 | }\r | |
8a67d61d | 1212 | if (Right == Tcb->SndUna) {\r |
1213 | \r | |
1214 | TcpClearTimer (Tcb, TCP_TIMER_REXMIT);\r | |
1215 | TcpSetProbeTimer (Tcb);\r | |
1216 | }\r | |
1217 | }\r | |
1218 | }\r | |
1219 | \r | |
1220 | Tcb->SndWnd = Seg->Wnd;\r | |
36ee91ca | 1221 | Tcb->SndWndMax = MAX (Tcb->SndWnd, Tcb->SndWndMax);\r |
8a67d61d | 1222 | Tcb->SndWl1 = Seg->Seq;\r |
1223 | Tcb->SndWl2 = Seg->Ack;\r | |
1224 | }\r | |
1225 | \r | |
1226 | NO_UPDATE:\r | |
1227 | \r | |
1228 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_SENT) &&\r | |
1229 | (Tcb->SndUna == Tcb->SndNxt)) {\r | |
1230 | \r | |
dea6914d | 1231 | DEBUG ((EFI_D_NET, "TcpInput: local FIN is ACKed by"\r |
0e549d5b | 1232 | " peer for connected TCB %p\n", Tcb));\r |
8a67d61d | 1233 | \r |
1234 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED);\r | |
1235 | }\r | |
1236 | \r | |
1237 | //\r | |
1238 | // Transit the state if proper.\r | |
1239 | //\r | |
1240 | switch (Tcb->State) {\r | |
1241 | case TCP_FIN_WAIT_1:\r | |
1242 | \r | |
1243 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
1244 | \r | |
1245 | TcpSetState (Tcb, TCP_FIN_WAIT_2);\r | |
1246 | \r | |
1247 | TcpClearAllTimer (Tcb);\r | |
1248 | TcpSetTimer (Tcb, TCP_TIMER_FINWAIT2, Tcb->FinWait2Timeout);\r | |
1249 | }\r | |
1250 | \r | |
1251 | case TCP_FIN_WAIT_2:\r | |
1252 | \r | |
1253 | break;\r | |
1254 | \r | |
1255 | case TCP_CLOSE_WAIT:\r | |
1256 | break;\r | |
1257 | \r | |
1258 | case TCP_CLOSING:\r | |
1259 | \r | |
1260 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
1261 | \r | |
1262 | TcpSetState (Tcb, TCP_TIME_WAIT);\r | |
1263 | \r | |
1264 | TcpClearAllTimer (Tcb);\r | |
1265 | \r | |
1266 | if (Tcb->TimeWaitTimeout != 0) {\r | |
1267 | \r | |
1268 | TcpSetTimer (Tcb, TCP_TIMER_2MSL, Tcb->TimeWaitTimeout);\r | |
1269 | } else {\r | |
1270 | \r | |
e48e37fc | 1271 | DEBUG ((EFI_D_WARN, "Connection closed immediately "\r |
0e549d5b | 1272 | "because app disables TIME_WAIT timer for %p\n", Tcb));\r |
8a67d61d | 1273 | \r |
1274 | TcpClose (Tcb);\r | |
1275 | }\r | |
1276 | }\r | |
1277 | break;\r | |
1278 | \r | |
1279 | case TCP_LAST_ACK:\r | |
1280 | \r | |
1281 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_ACKED)) {\r | |
1282 | \r | |
1283 | TcpSetState (Tcb, TCP_CLOSED);\r | |
1284 | }\r | |
1285 | \r | |
1286 | break;\r | |
1287 | \r | |
1288 | case TCP_TIME_WAIT:\r | |
1289 | \r | |
1290 | TcpSendAck (Tcb);\r | |
1291 | \r | |
1292 | if (Tcb->TimeWaitTimeout != 0) {\r | |
1293 | \r | |
1294 | TcpSetTimer (Tcb, TCP_TIMER_2MSL, Tcb->TimeWaitTimeout);\r | |
1295 | } else {\r | |
1296 | \r | |
e48e37fc | 1297 | DEBUG ((EFI_D_WARN, "Connection closed immediately "\r |
0e549d5b | 1298 | "because app disables TIME_WAIT timer for %p\n", Tcb));\r |
8a67d61d | 1299 | \r |
1300 | TcpClose (Tcb);\r | |
1301 | }\r | |
1302 | break;\r | |
c191cdd1 | 1303 | \r |
1304 | default:\r | |
1305 | break;\r | |
8a67d61d | 1306 | }\r |
1307 | \r | |
1308 | //\r | |
1309 | // Sixth step: Check the URG bit.update the Urg point\r | |
1310 | // if in TCP_CAN_RECV, otherwise, leave the RcvUp intact.\r | |
1311 | //\r | |
1312 | StepSix:\r | |
1313 | \r | |
1314 | Tcb->Idle = 0;\r | |
1315 | TcpSetKeepaliveTimer (Tcb);\r | |
1316 | \r | |
8a67d61d | 1317 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_URG) &&\r |
d1102dba | 1318 | !TCP_FIN_RCVD (Tcb->State))\r |
49789216 | 1319 | {\r |
8a67d61d | 1320 | \r |
dea6914d | 1321 | DEBUG ((EFI_D_NET, "TcpInput: received urgent data "\r |
0e549d5b | 1322 | "from peer for connected TCB %p\n", Tcb));\r |
8a67d61d | 1323 | \r |
1324 | Urg = Seg->Seq + Seg->Urg;\r | |
1325 | \r | |
1326 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_URG) &&\r | |
1327 | TCP_SEQ_GT (Urg, Tcb->RcvUp)) {\r | |
1328 | \r | |
1329 | Tcb->RcvUp = Urg;\r | |
1330 | } else {\r | |
1331 | \r | |
1332 | Tcb->RcvUp = Urg;\r | |
1333 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_RCVD_URG);\r | |
1334 | }\r | |
1335 | }\r | |
1336 | \r | |
1337 | //\r | |
1338 | // Seventh step: Process the segment data\r | |
1339 | //\r | |
1340 | if (Seg->End != Seg->Seq) {\r | |
1341 | \r | |
1342 | if (TCP_FIN_RCVD (Tcb->State)) {\r | |
1343 | \r | |
e48e37fc | 1344 | DEBUG ((EFI_D_WARN, "TcpInput: connection reset because"\r |
0e549d5b | 1345 | " data is lost for connected TCB %p\n", Tcb));\r |
8a67d61d | 1346 | \r |
1347 | goto RESET_THEN_DROP;\r | |
1348 | }\r | |
1349 | \r | |
1350 | if (TCP_LOCAL_CLOSED (Tcb->State) && (Nbuf->TotalSize != 0)) {\r | |
e48e37fc | 1351 | DEBUG ((EFI_D_WARN, "TcpInput: connection reset because"\r |
0e549d5b | 1352 | " data is lost for connected TCB %p\n", Tcb));\r |
8a67d61d | 1353 | \r |
1354 | goto RESET_THEN_DROP;\r | |
1355 | }\r | |
1356 | \r | |
1357 | TcpQueueData (Tcb, Nbuf);\r | |
1358 | if (TcpDeliverData (Tcb) == -1) {\r | |
1359 | goto RESET_THEN_DROP;\r | |
1360 | }\r | |
1361 | \r | |
e48e37fc | 1362 | if (!IsListEmpty (&Tcb->RcvQue)) {\r |
8a67d61d | 1363 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r |
1364 | }\r | |
1365 | }\r | |
1366 | \r | |
1367 | //\r | |
1368 | // Eighth step: check the FIN.\r | |
1369 | // This step is moved to TcpDeliverData. FIN will be\r | |
1370 | // processed in sequence there. Check the comments in\r | |
1371 | // the beginning of the file header for information.\r | |
1372 | //\r | |
1373 | \r | |
1374 | //\r | |
1375 | // Tcb is a new child of the listening Parent,\r | |
1376 | // commit it.\r | |
1377 | //\r | |
85511ddf | 1378 | if (Parent != NULL) {\r |
8a67d61d | 1379 | Tcb->Parent = Parent;\r |
1380 | TcpInsertTcb (Tcb);\r | |
1381 | }\r | |
1382 | \r | |
1383 | if ((Tcb->State != TCP_CLOSED) &&\r | |
85511ddf | 1384 | (TcpToSendData (Tcb, 0) == 0) &&\r |
52b2a308 | 1385 | (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW) || (Nbuf->TotalSize != 0))) {\r |
8a67d61d | 1386 | \r |
1387 | TcpToSendAck (Tcb);\r | |
1388 | }\r | |
1389 | \r | |
1390 | NetbufFree (Nbuf);\r | |
1391 | return 0;\r | |
1392 | \r | |
1393 | RESET_THEN_DROP:\r | |
1394 | TcpSendReset (Tcb, Head, Len, Dst, Src);\r | |
1395 | \r | |
1396 | DROP_CONNECTION:\r | |
120db52c | 1397 | ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL));\r |
8a67d61d | 1398 | \r |
1399 | NetbufFree (Nbuf);\r | |
1400 | TcpClose (Tcb);\r | |
1401 | \r | |
1402 | return -1;\r | |
1403 | \r | |
1404 | SEND_RESET:\r | |
1405 | \r | |
1406 | TcpSendReset (Tcb, Head, Len, Dst, Src);\r | |
1407 | \r | |
1408 | DISCARD:\r | |
1409 | \r | |
1410 | //\r | |
1411 | // Tcb is a child of Parent, and it doesn't survive\r | |
1412 | //\r | |
e48e37fc | 1413 | DEBUG ((EFI_D_WARN, "Tcp4Input: Discard a packet\n"));\r |
8a67d61d | 1414 | NetbufFree (Nbuf);\r |
1415 | \r | |
85511ddf | 1416 | if ((Parent != NULL) && (Tcb != NULL)) {\r |
8a67d61d | 1417 | \r |
120db52c | 1418 | ASSERT (Tcb->Sk != NULL);\r |
8a67d61d | 1419 | TcpClose (Tcb);\r |
1420 | }\r | |
1421 | \r | |
1422 | return 0;\r | |
1423 | }\r | |
1424 | \r | |
1425 | \r | |
1426 | /**\r | |
1427 | Process the received ICMP error messages for TCP.\r | |
1428 | \r | |
1429 | @param Nbuf Buffer that contains part of the TCP segment without IP header\r | |
1430 | truncated from the ICMP error packet.\r | |
1431 | @param IcmpErr The ICMP error code interpreted from ICMP error packet.\r | |
1432 | @param Src Source address of the ICMP error message.\r | |
1433 | @param Dst Destination address of the ICMP error message.\r | |
1434 | \r | |
8a67d61d | 1435 | **/\r |
1436 | VOID\r | |
1437 | TcpIcmpInput (\r | |
1438 | IN NET_BUF *Nbuf,\r | |
b45b45b2 | 1439 | IN UINT8 IcmpErr,\r |
8a67d61d | 1440 | IN UINT32 Src,\r |
1441 | IN UINT32 Dst\r | |
1442 | )\r | |
1443 | {\r | |
1444 | TCP_HEAD *Head;\r | |
1445 | TCP_CB *Tcb;\r | |
1446 | TCP_SEQNO Seq;\r | |
1447 | EFI_STATUS IcmpErrStatus;\r | |
1448 | BOOLEAN IcmpErrIsHard;\r | |
1449 | BOOLEAN IcmpErrNotify;\r | |
1450 | \r | |
1b31acb6 FS |
1451 | if (Nbuf->TotalSize < sizeof (TCP_HEAD)) {\r |
1452 | goto CLEAN_EXIT;\r | |
1453 | }\r | |
1454 | \r | |
8a67d61d | 1455 | Head = (TCP_HEAD *) NetbufGetByte (Nbuf, 0, NULL);\r |
a56b6e03 | 1456 | ASSERT (Head != NULL);\r |
8a67d61d | 1457 | Tcb = TcpLocateTcb (\r |
1458 | Head->DstPort,\r | |
1459 | Dst,\r | |
1460 | Head->SrcPort,\r | |
1461 | Src,\r | |
1462 | FALSE\r | |
1463 | );\r | |
1464 | if (Tcb == NULL || Tcb->State == TCP_CLOSED) {\r | |
1465 | \r | |
1466 | goto CLEAN_EXIT;\r | |
1467 | }\r | |
1468 | \r | |
1469 | //\r | |
1470 | // Validate the sequence number.\r | |
1471 | //\r | |
1472 | Seq = NTOHL (Head->Seq);\r | |
1473 | if (!(TCP_SEQ_LEQ (Tcb->SndUna, Seq) && TCP_SEQ_LT (Seq, Tcb->SndNxt))) {\r | |
1474 | \r | |
1475 | goto CLEAN_EXIT;\r | |
1476 | }\r | |
1477 | \r | |
fb115c61 | 1478 | IcmpErrStatus = IpIoGetIcmpErrStatus (\r |
1479 | IcmpErr,\r | |
1480 | IP_VERSION_4,\r | |
1481 | &IcmpErrIsHard,\r | |
1482 | &IcmpErrNotify\r | |
1483 | );\r | |
8a67d61d | 1484 | \r |
1485 | if (IcmpErrNotify) {\r | |
1486 | \r | |
1487 | SOCK_ERROR (Tcb->Sk, IcmpErrStatus);\r | |
1488 | }\r | |
1489 | \r | |
1490 | if (IcmpErrIsHard) {\r | |
1491 | \r | |
1492 | TcpClose (Tcb);\r | |
1493 | }\r | |
1494 | \r | |
1495 | CLEAN_EXIT:\r | |
1496 | NetbufFree (Nbuf);\r | |
1497 | }\r |