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8a67d61d | 1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2005 - 2006, Intel Corporation\r | |
4 | All rights reserved. This program and the accompanying materials\r | |
5 | are licensed and made available under the terms and conditions of the BSD License\r | |
6 | which accompanies this distribution. The full text of the license may be found at\r | |
7 | http://opensource.org/licenses/bsd-license.php\r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | Tcp4Output.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | TCP output process routines.\r | |
19 | \r | |
20 | \r | |
21 | **/\r | |
22 | \r | |
23 | #include "Tcp4Main.h"\r | |
24 | \r | |
fe1e36e5 | 25 | UINT8 mTcpOutFlag[] = {\r |
8a67d61d | 26 | 0, // TCP_CLOSED\r |
27 | 0, // TCP_LISTEN\r | |
28 | TCP_FLG_SYN, // TCP_SYN_SENT\r | |
29 | TCP_FLG_SYN | TCP_FLG_ACK, // TCP_SYN_RCVD\r | |
30 | TCP_FLG_ACK, // TCP_ESTABLISHED\r | |
31 | TCP_FLG_FIN | TCP_FLG_ACK, // TCP_FIN_WAIT_1\r | |
32 | TCP_FLG_ACK, // TCP_FIN_WAIT_2\r | |
33 | TCP_FLG_ACK | TCP_FLG_FIN, // TCP_CLOSING\r | |
34 | TCP_FLG_ACK, // TCP_TIME_WAIT\r | |
35 | TCP_FLG_ACK, // TCP_CLOSE_WAIT\r | |
36 | TCP_FLG_FIN | TCP_FLG_ACK // TCP_LAST_ACK\r | |
37 | };\r | |
38 | \r | |
39 | \r | |
40 | /**\r | |
41 | Compute the sequence space left in the old receive window.\r | |
42 | \r | |
43 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
44 | \r | |
45 | @return The sequence space left in the old receive window.\r | |
46 | \r | |
47 | **/\r | |
48 | UINT32\r | |
49 | TcpRcvWinOld (\r | |
50 | IN TCP_CB *Tcb\r | |
51 | )\r | |
52 | {\r | |
53 | UINT32 OldWin;\r | |
54 | \r | |
55 | OldWin = 0;\r | |
56 | \r | |
57 | if (TCP_SEQ_GT (Tcb->RcvWl2 + Tcb->RcvWnd, Tcb->RcvNxt)) {\r | |
58 | \r | |
59 | OldWin = TCP_SUB_SEQ (\r | |
60 | Tcb->RcvWl2 + Tcb->RcvWnd,\r | |
61 | Tcb->RcvNxt\r | |
62 | );\r | |
63 | }\r | |
64 | \r | |
65 | return OldWin;\r | |
66 | }\r | |
67 | \r | |
68 | \r | |
69 | /**\r | |
70 | Compute the current receive window.\r | |
71 | \r | |
72 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
73 | \r | |
74 | @return The size of the current receive window, in bytes.\r | |
75 | \r | |
76 | **/\r | |
77 | UINT32\r | |
78 | TcpRcvWinNow (\r | |
79 | IN TCP_CB *Tcb\r | |
80 | )\r | |
81 | {\r | |
82 | SOCKET *Sk;\r | |
83 | UINT32 Win;\r | |
84 | UINT32 Increase;\r | |
85 | UINT32 OldWin;\r | |
86 | \r | |
87 | Sk = Tcb->Sk;\r | |
120db52c | 88 | ASSERT (Sk != NULL);\r |
8a67d61d | 89 | \r |
90 | OldWin = TcpRcvWinOld (Tcb);\r | |
91 | \r | |
92 | Win = SockGetFreeSpace (Sk, SOCK_RCV_BUF);\r | |
93 | \r | |
94 | Increase = 0;\r | |
95 | if (Win > OldWin) {\r | |
96 | Increase = Win - OldWin;\r | |
97 | }\r | |
98 | \r | |
99 | //\r | |
100 | // Receiver's SWS: don't advertise a bigger window\r | |
101 | // unless it can be increased by at least one Mss or\r | |
102 | // half of the receive buffer.\r | |
103 | //\r | |
104 | if ((Increase > Tcb->SndMss) ||\r | |
105 | (2 * Increase >= GET_RCV_BUFFSIZE (Sk))) {\r | |
106 | \r | |
107 | return Win;\r | |
108 | }\r | |
109 | \r | |
110 | return OldWin;\r | |
111 | }\r | |
112 | \r | |
113 | \r | |
114 | /**\r | |
115 | Compute the value to fill in the window size field\r | |
116 | of the outgoing segment.\r | |
117 | \r | |
118 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
119 | @param Syn The flag to indicate whether the outgoing segment is a SYN\r | |
120 | segment.\r | |
121 | \r | |
122 | @return The value of the local receive window size used to fill the outing segment.\r | |
123 | \r | |
124 | **/\r | |
8a67d61d | 125 | UINT16\r |
126 | TcpComputeWnd (\r | |
127 | IN TCP_CB *Tcb,\r | |
128 | IN BOOLEAN Syn\r | |
129 | )\r | |
130 | {\r | |
131 | UINT32 Wnd;\r | |
132 | \r | |
133 | //\r | |
134 | // RFC requires that initial window not be scaled\r | |
135 | //\r | |
136 | if (Syn) {\r | |
137 | \r | |
138 | Wnd = GET_RCV_BUFFSIZE (Tcb->Sk);\r | |
139 | } else {\r | |
140 | \r | |
141 | Wnd = TcpRcvWinNow (Tcb);\r | |
142 | \r | |
143 | Tcb->RcvWnd = Wnd;\r | |
144 | }\r | |
145 | \r | |
36ee91ca | 146 | Wnd = MIN (Wnd >> Tcb->RcvWndScale, 0xffff);\r |
8a67d61d | 147 | return NTOHS ((UINT16) Wnd);\r |
148 | }\r | |
149 | \r | |
150 | \r | |
151 | /**\r | |
152 | Get the maximum SndNxt.\r | |
153 | \r | |
154 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
155 | \r | |
156 | @return The sequence number of the maximum SndNxt.\r | |
157 | \r | |
158 | **/\r | |
159 | TCP_SEQNO\r | |
160 | TcpGetMaxSndNxt (\r | |
161 | IN TCP_CB *Tcb\r | |
162 | )\r | |
163 | {\r | |
e48e37fc | 164 | LIST_ENTRY *Entry;\r |
8a67d61d | 165 | NET_BUF *Nbuf;\r |
166 | \r | |
e48e37fc | 167 | if (IsListEmpty (&Tcb->SndQue)) {\r |
8a67d61d | 168 | return Tcb->SndNxt;\r |
169 | }\r | |
170 | \r | |
171 | Entry = Tcb->SndQue.BackLink;\r | |
172 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
173 | \r | |
174 | ASSERT (TCP_SEQ_GEQ (TCPSEG_NETBUF (Nbuf)->End, Tcb->SndNxt));\r | |
175 | return TCPSEG_NETBUF (Nbuf)->End;\r | |
176 | }\r | |
177 | \r | |
178 | \r | |
179 | /**\r | |
180 | Compute how much data to send.\r | |
181 | \r | |
182 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
183 | @param Force Whether to ignore the sender's SWS avoidance algorithm and send\r | |
184 | out data by force.\r | |
185 | \r | |
186 | @return The length of the data can be sent, if 0, no data can be sent.\r | |
187 | \r | |
188 | **/\r | |
189 | UINT32\r | |
190 | TcpDataToSend (\r | |
191 | IN TCP_CB *Tcb,\r | |
192 | IN INTN Force\r | |
193 | )\r | |
194 | {\r | |
195 | SOCKET *Sk;\r | |
196 | UINT32 Win;\r | |
197 | UINT32 Len;\r | |
198 | UINT32 Left;\r | |
199 | UINT32 Limit;\r | |
200 | \r | |
201 | Sk = Tcb->Sk;\r | |
120db52c | 202 | ASSERT (Sk != NULL);\r |
8a67d61d | 203 | \r |
204 | //\r | |
205 | // TCP should NOT send data beyond the send window\r | |
206 | // and congestion window. The right edge of send\r | |
207 | // window is defined as SND.WL2 + SND.WND. The right\r | |
208 | // edge of congestion window is defined as SND.UNA +\r | |
209 | // CWND.\r | |
210 | //\r | |
211 | Win = 0;\r | |
212 | Limit = Tcb->SndWl2 + Tcb->SndWnd;\r | |
213 | \r | |
214 | if (TCP_SEQ_GT (Limit, Tcb->SndUna + Tcb->CWnd)) {\r | |
215 | \r | |
216 | Limit = Tcb->SndUna + Tcb->CWnd;\r | |
217 | }\r | |
218 | \r | |
219 | if (TCP_SEQ_GT (Limit, Tcb->SndNxt)) {\r | |
220 | Win = TCP_SUB_SEQ (Limit, Tcb->SndNxt);\r | |
221 | }\r | |
222 | \r | |
223 | //\r | |
224 | // The data to send contains two parts: the data on the\r | |
225 | // socket send queue, and the data on the TCB's send\r | |
226 | // buffer. The later can be non-zero if the peer shrinks\r | |
227 | // its advertised window.\r | |
228 | //\r | |
229 | Left = GET_SND_DATASIZE (Sk) +\r | |
230 | TCP_SUB_SEQ (TcpGetMaxSndNxt (Tcb), Tcb->SndNxt);\r | |
231 | \r | |
36ee91ca | 232 | Len = MIN (Win, Left);\r |
8a67d61d | 233 | \r |
234 | if (Len > Tcb->SndMss) {\r | |
235 | Len = Tcb->SndMss;\r | |
236 | }\r | |
237 | \r | |
85511ddf | 238 | if ((Force != 0)|| (Len == 0 && Left == 0)) {\r |
8a67d61d | 239 | return Len;\r |
240 | }\r | |
241 | \r | |
242 | if (Len == 0 && Left != 0) {\r | |
243 | goto SetPersistTimer;\r | |
244 | }\r | |
245 | \r | |
246 | //\r | |
247 | // Sender's SWS avoidance: Don't send a small segment unless\r | |
248 | // a)A full-sized segment can be sent,\r | |
249 | // b)at least one-half of the maximum sized windows that\r | |
250 | // the other end has ever advertised.\r | |
251 | // c)It can send everything it has and either it isn't\r | |
252 | // expecting an ACK or the Nagle algorithm is disabled.\r | |
253 | //\r | |
254 | if ((Len == Tcb->SndMss) || (2 * Len >= Tcb->SndWndMax)) {\r | |
255 | \r | |
256 | return Len;\r | |
257 | }\r | |
258 | \r | |
259 | if ((Len == Left) &&\r | |
260 | ((Tcb->SndNxt == Tcb->SndUna) ||\r | |
261 | TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_NO_NAGLE))) {\r | |
262 | \r | |
263 | return Len;\r | |
264 | }\r | |
265 | \r | |
266 | //\r | |
267 | // RFC1122 suggests to set a timer when SWSA forbids TCP\r | |
268 | // sending more data, and combine it with probe timer.\r | |
269 | //\r | |
270 | SetPersistTimer:\r | |
271 | if (!TCP_TIMER_ON (Tcb->EnabledTimer, TCP_TIMER_REXMIT)) {\r | |
272 | \r | |
e48e37fc | 273 | DEBUG (\r |
274 | (EFI_D_WARN,\r | |
0e549d5b | 275 | "TcpDataToSend: enter persistent state for TCB %p\n",\r |
8a67d61d | 276 | Tcb)\r |
277 | );\r | |
278 | \r | |
279 | TcpSetProbeTimer (Tcb);\r | |
280 | }\r | |
281 | \r | |
282 | return 0;\r | |
283 | }\r | |
284 | \r | |
285 | \r | |
286 | /**\r | |
120db52c | 287 | Build the TCP header of the TCP segment and transmit the segment by IP.\r |
8a67d61d | 288 | \r |
289 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
290 | @param Nbuf Pointer to the buffer containing the segment to be sent out.\r | |
291 | \r | |
292 | @retval 0 The segment is sent out successfully.\r | |
293 | @retval other Error condition occurred.\r | |
294 | \r | |
295 | **/\r | |
8a67d61d | 296 | INTN\r |
297 | TcpTransmitSegment (\r | |
298 | IN TCP_CB *Tcb,\r | |
299 | IN NET_BUF *Nbuf\r | |
300 | )\r | |
301 | {\r | |
302 | UINT16 Len;\r | |
303 | TCP_HEAD *Head;\r | |
304 | TCP_SEG *Seg;\r | |
305 | BOOLEAN Syn;\r | |
306 | UINT32 DataLen;\r | |
307 | \r | |
120db52c | 308 | ASSERT ((Nbuf != NULL) && (Nbuf->Tcp == NULL) && (TcpVerifySegment (Nbuf) != 0));\r |
8a67d61d | 309 | \r |
310 | DataLen = Nbuf->TotalSize;\r | |
311 | \r | |
312 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
313 | Syn = TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN);\r | |
314 | \r | |
315 | if (Syn) {\r | |
316 | \r | |
317 | Len = TcpSynBuildOption (Tcb, Nbuf);\r | |
318 | } else {\r | |
319 | \r | |
320 | Len = TcpBuildOption (Tcb, Nbuf);\r | |
321 | }\r | |
322 | \r | |
323 | ASSERT ((Len % 4 == 0) && (Len <= 40));\r | |
324 | \r | |
325 | Len += sizeof (TCP_HEAD);\r | |
326 | \r | |
327 | Head = (TCP_HEAD *) NetbufAllocSpace (\r | |
328 | Nbuf,\r | |
329 | sizeof (TCP_HEAD),\r | |
330 | NET_BUF_HEAD\r | |
331 | );\r | |
332 | \r | |
333 | ASSERT (Head != NULL);\r | |
334 | \r | |
335 | Nbuf->Tcp = Head;\r | |
336 | \r | |
337 | Head->SrcPort = Tcb->LocalEnd.Port;\r | |
338 | Head->DstPort = Tcb->RemoteEnd.Port;\r | |
339 | Head->Seq = NTOHL (Seg->Seq);\r | |
340 | Head->Ack = NTOHL (Tcb->RcvNxt);\r | |
341 | Head->HeadLen = (UINT8) (Len >> 2);\r | |
342 | Head->Res = 0;\r | |
343 | Head->Wnd = TcpComputeWnd (Tcb, Syn);\r | |
344 | Head->Checksum = 0;\r | |
345 | \r | |
346 | //\r | |
347 | // Check whether to set the PSH flag.\r | |
348 | //\r | |
349 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_PSH);\r | |
350 | \r | |
351 | if (DataLen != 0) {\r | |
352 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_SND_PSH) &&\r | |
353 | TCP_SEQ_BETWEEN (Seg->Seq, Tcb->SndPsh, Seg->End)) {\r | |
354 | \r | |
355 | TCP_SET_FLG (Seg->Flag, TCP_FLG_PSH);\r | |
356 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_SND_PSH);\r | |
357 | \r | |
358 | } else if ((Seg->End == Tcb->SndNxt) &&\r | |
359 | (GET_SND_DATASIZE (Tcb->Sk) == 0)) {\r | |
360 | \r | |
361 | TCP_SET_FLG (Seg->Flag, TCP_FLG_PSH);\r | |
362 | }\r | |
363 | }\r | |
364 | \r | |
365 | //\r | |
366 | // Check whether to set the URG flag and the urgent pointer.\r | |
367 | //\r | |
368 | TCP_CLEAR_FLG (Seg->Flag, TCP_FLG_URG);\r | |
369 | \r | |
370 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_SND_URG) &&\r | |
371 | TCP_SEQ_LEQ (Seg->Seq, Tcb->SndUp)) {\r | |
372 | \r | |
373 | TCP_SET_FLG (Seg->Flag, TCP_FLG_URG);\r | |
374 | \r | |
375 | if (TCP_SEQ_LT (Tcb->SndUp, Seg->End)) {\r | |
376 | \r | |
377 | Seg->Urg = (UINT16) TCP_SUB_SEQ (Tcb->SndUp, Seg->Seq);\r | |
378 | } else {\r | |
379 | \r | |
36ee91ca | 380 | Seg->Urg = (UINT16) MIN (\r |
8a67d61d | 381 | TCP_SUB_SEQ (Tcb->SndUp,\r |
382 | Seg->Seq),\r | |
383 | 0xffff\r | |
384 | );\r | |
385 | }\r | |
386 | }\r | |
387 | \r | |
388 | Head->Flag = Seg->Flag;\r | |
389 | Head->Urg = NTOHS (Seg->Urg);\r | |
390 | Head->Checksum = TcpChecksum (Nbuf, Tcb->HeadSum);\r | |
391 | \r | |
392 | //\r | |
393 | // update the TCP session's control information\r | |
394 | //\r | |
395 | Tcb->RcvWl2 = Tcb->RcvNxt;\r | |
396 | if (Syn) {\r | |
397 | Tcb->RcvWnd = NTOHS (Head->Wnd);\r | |
398 | }\r | |
399 | \r | |
400 | //\r | |
401 | // clear delayedack flag\r | |
402 | //\r | |
403 | Tcb->DelayedAck = 0;\r | |
404 | \r | |
405 | return TcpSendIpPacket (Tcb, Nbuf, Tcb->LocalEnd.Ip, Tcb->RemoteEnd.Ip);\r | |
406 | }\r | |
407 | \r | |
408 | \r | |
409 | /**\r | |
410 | Get a segment from the Tcb's SndQue.\r | |
411 | \r | |
412 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
413 | @param Seq The sequence number of the segment.\r | |
414 | @param Len The maximum length of the segment.\r | |
415 | \r | |
416 | @return Pointer to the segment, if NULL some error occurred.\r | |
417 | \r | |
418 | **/\r | |
419 | NET_BUF *\r | |
420 | TcpGetSegmentSndQue (\r | |
421 | IN TCP_CB *Tcb,\r | |
422 | IN TCP_SEQNO Seq,\r | |
423 | IN UINT32 Len\r | |
424 | )\r | |
425 | {\r | |
e48e37fc | 426 | LIST_ENTRY *Head;\r |
427 | LIST_ENTRY *Cur;\r | |
8a67d61d | 428 | NET_BUF *Node;\r |
429 | TCP_SEG *Seg;\r | |
430 | NET_BUF *Nbuf;\r | |
431 | TCP_SEQNO End;\r | |
432 | UINT8 *Data;\r | |
433 | UINT8 Flag;\r | |
434 | INT32 Offset;\r | |
435 | INT32 CopyLen;\r | |
436 | \r | |
120db52c | 437 | ASSERT ((Tcb != NULL) && TCP_SEQ_LEQ (Seq, Tcb->SndNxt) && (Len > 0));\r |
8a67d61d | 438 | \r |
439 | //\r | |
440 | // Find the segment that contains the Seq.\r | |
441 | //\r | |
442 | Head = &Tcb->SndQue;\r | |
443 | \r | |
444 | Node = NULL;\r | |
445 | Seg = NULL;\r | |
446 | \r | |
447 | NET_LIST_FOR_EACH (Cur, Head) {\r | |
448 | Node = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r | |
449 | Seg = TCPSEG_NETBUF (Node);\r | |
450 | \r | |
451 | if (TCP_SEQ_LT (Seq, Seg->End) && TCP_SEQ_LEQ (Seg->Seq, Seq)) {\r | |
452 | \r | |
453 | break;\r | |
454 | }\r | |
455 | }\r | |
456 | \r | |
457 | ASSERT (Cur != Head);\r | |
458 | \r | |
459 | //\r | |
460 | // Return the buffer if it can be returned without\r | |
461 | // adjustment:\r | |
462 | //\r | |
463 | if ((Seg->Seq == Seq) &&\r | |
464 | TCP_SEQ_LEQ (Seg->End, Seg->Seq + Len) &&\r | |
465 | !NET_BUF_SHARED (Node)) {\r | |
466 | \r | |
467 | NET_GET_REF (Node);\r | |
468 | return Node;\r | |
469 | }\r | |
470 | \r | |
471 | //\r | |
472 | // Create a new buffer and copy data there.\r | |
473 | //\r | |
474 | Nbuf = NetbufAlloc (Len + TCP_MAX_HEAD);\r | |
475 | \r | |
476 | if (Nbuf == NULL) {\r | |
477 | return NULL;\r | |
478 | }\r | |
479 | \r | |
480 | NetbufReserve (Nbuf, TCP_MAX_HEAD);\r | |
481 | \r | |
482 | Flag = Seg->Flag;\r | |
483 | End = Seg->End;\r | |
484 | \r | |
485 | if (TCP_SEQ_LT (Seq + Len, Seg->End)) {\r | |
486 | End = Seq + Len;\r | |
487 | }\r | |
488 | \r | |
489 | CopyLen = TCP_SUB_SEQ (End, Seq);\r | |
490 | Offset = TCP_SUB_SEQ (Seq, Seg->Seq);\r | |
491 | \r | |
492 | //\r | |
493 | // If SYN is set and out of the range, clear the flag.\r | |
494 | // Becuase the sequence of the first byte is SEG.SEQ+1,\r | |
495 | // adjust Offset by -1. If SYN is in the range, copy\r | |
496 | // one byte less.\r | |
497 | //\r | |
498 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
499 | \r | |
500 | if (TCP_SEQ_LT (Seg->Seq, Seq)) {\r | |
501 | \r | |
502 | TCP_CLEAR_FLG (Flag, TCP_FLG_SYN);\r | |
503 | Offset--;\r | |
504 | } else {\r | |
505 | \r | |
506 | CopyLen--;\r | |
507 | }\r | |
508 | }\r | |
509 | \r | |
510 | //\r | |
511 | // If FIN is set and in the range, copy one byte less,\r | |
512 | // and if it is out of the range, clear the flag.\r | |
513 | //\r | |
514 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_FIN)) {\r | |
515 | \r | |
516 | if (Seg->End == End) {\r | |
517 | \r | |
518 | CopyLen--;\r | |
519 | } else {\r | |
520 | \r | |
521 | TCP_CLEAR_FLG (Flag, TCP_FLG_FIN);\r | |
522 | }\r | |
523 | }\r | |
524 | \r | |
525 | ASSERT (CopyLen >= 0);\r | |
526 | \r | |
527 | //\r | |
528 | // copy data to the segment\r | |
529 | //\r | |
85511ddf | 530 | if (CopyLen != 0) {\r |
8a67d61d | 531 | Data = NetbufAllocSpace (Nbuf, CopyLen, NET_BUF_TAIL);\r |
120db52c | 532 | ASSERT (Data != NULL);\r |
8a67d61d | 533 | \r |
534 | if ((INT32) NetbufCopy (Node, Offset, CopyLen, Data) != CopyLen) {\r | |
535 | goto OnError;\r | |
536 | }\r | |
537 | }\r | |
538 | \r | |
e48e37fc | 539 | CopyMem (TCPSEG_NETBUF (Nbuf), Seg, sizeof (TCP_SEG));\r |
8a67d61d | 540 | \r |
541 | TCPSEG_NETBUF (Nbuf)->Seq = Seq;\r | |
542 | TCPSEG_NETBUF (Nbuf)->End = End;\r | |
543 | TCPSEG_NETBUF (Nbuf)->Flag = Flag;\r | |
544 | \r | |
545 | return Nbuf;\r | |
546 | \r | |
547 | OnError:\r | |
548 | NetbufFree (Nbuf);\r | |
549 | return NULL;\r | |
550 | }\r | |
551 | \r | |
552 | \r | |
553 | /**\r | |
554 | Get a segment from the Tcb's socket buffer.\r | |
555 | \r | |
556 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
557 | @param Seq The sequence number of the segment.\r | |
558 | @param Len The maximum length of the segment.\r | |
559 | \r | |
560 | @return Pointer to the segment, if NULL some error occurred.\r | |
561 | \r | |
562 | **/\r | |
563 | NET_BUF *\r | |
564 | TcpGetSegmentSock (\r | |
565 | IN TCP_CB *Tcb,\r | |
566 | IN TCP_SEQNO Seq,\r | |
567 | IN UINT32 Len\r | |
568 | )\r | |
569 | {\r | |
570 | NET_BUF *Nbuf;\r | |
571 | UINT8 *Data;\r | |
572 | UINT32 DataGet;\r | |
573 | \r | |
120db52c | 574 | ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL));\r |
8a67d61d | 575 | \r |
576 | Nbuf = NetbufAlloc (Len + TCP_MAX_HEAD);\r | |
577 | \r | |
578 | if (Nbuf == NULL) {\r | |
e48e37fc | 579 | DEBUG ((EFI_D_ERROR, "TcpGetSegmentSock: failed to allocate "\r |
0e549d5b | 580 | "a netbuf for TCB %p\n",Tcb));\r |
8a67d61d | 581 | \r |
582 | return NULL;\r | |
583 | }\r | |
584 | \r | |
585 | NetbufReserve (Nbuf, TCP_MAX_HEAD);\r | |
586 | \r | |
587 | DataGet = 0;\r | |
588 | \r | |
85511ddf | 589 | if (Len != 0) {\r |
8a67d61d | 590 | //\r |
591 | // copy data to the segment.\r | |
592 | //\r | |
593 | Data = NetbufAllocSpace (Nbuf, Len, NET_BUF_TAIL);\r | |
120db52c | 594 | ASSERT (Data != NULL);\r |
8a67d61d | 595 | \r |
596 | DataGet = SockGetDataToSend (Tcb->Sk, 0, Len, Data);\r | |
597 | }\r | |
598 | \r | |
599 | NET_GET_REF (Nbuf);\r | |
600 | \r | |
601 | TCPSEG_NETBUF (Nbuf)->Seq = Seq;\r | |
602 | TCPSEG_NETBUF (Nbuf)->End = Seq + Len;\r | |
603 | \r | |
e48e37fc | 604 | InsertTailList (&(Tcb->SndQue), &(Nbuf->List));\r |
8a67d61d | 605 | \r |
606 | if (DataGet != 0) {\r | |
607 | \r | |
608 | SockDataSent (Tcb->Sk, DataGet);\r | |
609 | }\r | |
610 | \r | |
611 | return Nbuf;\r | |
612 | }\r | |
613 | \r | |
614 | \r | |
615 | /**\r | |
616 | Get a segment starting from sequence Seq of a maximum\r | |
617 | length of Len.\r | |
618 | \r | |
619 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
620 | @param Seq The sequence number of the segment.\r | |
621 | @param Len The maximum length of the segment.\r | |
622 | \r | |
623 | @return Pointer to the segment, if NULL some error occurred.\r | |
624 | \r | |
625 | **/\r | |
626 | NET_BUF *\r | |
627 | TcpGetSegment (\r | |
628 | IN TCP_CB *Tcb,\r | |
629 | IN TCP_SEQNO Seq,\r | |
630 | IN UINT32 Len\r | |
631 | )\r | |
632 | {\r | |
633 | NET_BUF *Nbuf;\r | |
634 | \r | |
120db52c | 635 | ASSERT (Tcb != NULL);\r |
8a67d61d | 636 | \r |
637 | //\r | |
638 | // Compare the SndNxt with the max sequence number sent.\r | |
639 | //\r | |
640 | if ((Len != 0) && TCP_SEQ_LT (Seq, TcpGetMaxSndNxt (Tcb))) {\r | |
641 | \r | |
642 | Nbuf = TcpGetSegmentSndQue (Tcb, Seq, Len);\r | |
643 | } else {\r | |
644 | \r | |
645 | Nbuf = TcpGetSegmentSock (Tcb, Seq, Len);\r | |
646 | }\r | |
647 | \r | |
120db52c | 648 | ASSERT (TcpVerifySegment (Nbuf) != 0);\r |
8a67d61d | 649 | return Nbuf;\r |
650 | }\r | |
651 | \r | |
652 | \r | |
653 | /**\r | |
654 | Retransmit the segment from sequence Seq.\r | |
655 | \r | |
656 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
657 | @param Seq The sequence number of the segment to be retransmitted.\r | |
658 | \r | |
659 | @retval 0 Retransmission succeeded.\r | |
660 | @retval -1 Error condition occurred.\r | |
661 | \r | |
662 | **/\r | |
663 | INTN\r | |
664 | TcpRetransmit (\r | |
665 | IN TCP_CB *Tcb,\r | |
666 | IN TCP_SEQNO Seq\r | |
667 | )\r | |
668 | {\r | |
669 | NET_BUF *Nbuf;\r | |
670 | UINT32 Len;\r | |
671 | \r | |
672 | //\r | |
673 | // Compute the maxium length of retransmission. It is\r | |
674 | // limited by three factors:\r | |
675 | // 1. Less than SndMss\r | |
676 | // 2. must in the current send window\r | |
677 | // 3. will not change the boundaries of queued segments.\r | |
678 | //\r | |
679 | if (TCP_SEQ_LT (Tcb->SndWl2 + Tcb->SndWnd, Seq)) {\r | |
e48e37fc | 680 | DEBUG ((EFI_D_WARN, "TcpRetransmit: retransmission cancelled "\r |
0e549d5b | 681 | "because send window too small for TCB %p\n", Tcb));\r |
8a67d61d | 682 | \r |
683 | return 0;\r | |
684 | }\r | |
685 | \r | |
686 | Len = TCP_SUB_SEQ (Tcb->SndWl2 + Tcb->SndWnd, Seq);\r | |
36ee91ca | 687 | Len = MIN (Len, Tcb->SndMss);\r |
8a67d61d | 688 | \r |
689 | Nbuf = TcpGetSegmentSndQue (Tcb, Seq, Len);\r | |
690 | if (Nbuf == NULL) {\r | |
691 | return -1;\r | |
692 | }\r | |
693 | \r | |
120db52c | 694 | ASSERT (TcpVerifySegment (Nbuf) != 0);\r |
8a67d61d | 695 | \r |
696 | if (TcpTransmitSegment (Tcb, Nbuf) != 0) {\r | |
697 | goto OnError;\r | |
698 | }\r | |
699 | \r | |
700 | //\r | |
701 | // The retransmitted buffer may be on the SndQue,\r | |
702 | // trim TCP head because all the buffer on SndQue\r | |
703 | // are headless.\r | |
704 | //\r | |
120db52c | 705 | ASSERT (Nbuf->Tcp != NULL);\r |
8a67d61d | 706 | NetbufTrim (Nbuf, (Nbuf->Tcp->HeadLen << 2), NET_BUF_HEAD);\r |
707 | Nbuf->Tcp = NULL;\r | |
708 | \r | |
709 | NetbufFree (Nbuf);\r | |
710 | return 0;\r | |
711 | \r | |
712 | OnError:\r | |
713 | if (Nbuf != NULL) {\r | |
714 | NetbufFree (Nbuf);\r | |
715 | }\r | |
716 | \r | |
717 | return -1;\r | |
718 | }\r | |
719 | \r | |
720 | \r | |
721 | /**\r | |
722 | Check whether to send data/SYN/FIN and piggy back an ACK.\r | |
723 | \r | |
724 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
725 | @param Force Whether to ignore the sender's SWS avoidance algorithm and send\r | |
726 | out data by force.\r | |
727 | \r | |
728 | @return The number of bytes sent.\r | |
729 | \r | |
730 | **/\r | |
731 | INTN\r | |
732 | TcpToSendData (\r | |
733 | IN TCP_CB *Tcb,\r | |
734 | IN INTN Force\r | |
735 | )\r | |
736 | {\r | |
737 | UINT32 Len;\r | |
738 | INTN Sent;\r | |
739 | UINT8 Flag;\r | |
740 | NET_BUF *Nbuf;\r | |
741 | TCP_SEG *Seg;\r | |
742 | TCP_SEQNO Seq;\r | |
743 | TCP_SEQNO End;\r | |
744 | \r | |
120db52c | 745 | ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL) && (Tcb->State != TCP_LISTEN));\r |
8a67d61d | 746 | \r |
747 | Sent = 0;\r | |
748 | \r | |
749 | if ((Tcb->State == TCP_CLOSED) ||\r | |
750 | TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_FIN_SENT)) {\r | |
751 | \r | |
752 | return 0;\r | |
753 | }\r | |
754 | \r | |
755 | SEND_AGAIN:\r | |
756 | //\r | |
757 | // compute how much data can be sent\r | |
758 | //\r | |
759 | Len = TcpDataToSend (Tcb, Force);\r | |
760 | Seq = Tcb->SndNxt;\r | |
761 | \r | |
762 | Flag = mTcpOutFlag[Tcb->State];\r | |
763 | \r | |
85511ddf | 764 | if ((Flag & TCP_FLG_SYN) != 0) {\r |
8a67d61d | 765 | \r |
766 | Seq = Tcb->Iss;\r | |
767 | Len = 0;\r | |
768 | }\r | |
769 | \r | |
770 | //\r | |
771 | // only send a segment without data if SYN or\r | |
772 | // FIN is set.\r | |
773 | //\r | |
85511ddf | 774 | if ((Len == 0) && \r |
775 | ((Flag & (TCP_FLG_SYN | TCP_FLG_FIN)) == 0)) {\r | |
8a67d61d | 776 | return Sent;\r |
777 | }\r | |
778 | \r | |
779 | Nbuf = TcpGetSegment (Tcb, Seq, Len);\r | |
780 | \r | |
781 | if (Nbuf == NULL) {\r | |
e48e37fc | 782 | DEBUG (\r |
783 | (EFI_D_ERROR,\r | |
0e549d5b | 784 | "TcpToSendData: failed to get a segment for TCB %p\n",\r |
8a67d61d | 785 | Tcb)\r |
786 | );\r | |
787 | \r | |
788 | goto OnError;\r | |
789 | }\r | |
790 | \r | |
791 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
792 | \r | |
793 | //\r | |
794 | // Set the TcpSeg in Nbuf.\r | |
795 | //\r | |
796 | Len = Nbuf->TotalSize;\r | |
797 | End = Seq + Len;\r | |
798 | if (TCP_FLG_ON (Flag, TCP_FLG_SYN)) {\r | |
799 | End++;\r | |
800 | }\r | |
801 | \r | |
85511ddf | 802 | if ((Flag & TCP_FLG_FIN) != 0) {\r |
8a67d61d | 803 | //\r |
804 | // Send FIN if all data is sent, and FIN is\r | |
805 | // in the window\r | |
806 | //\r | |
807 | if ((TcpGetMaxSndNxt (Tcb) == Tcb->SndNxt) &&\r | |
808 | (GET_SND_DATASIZE (Tcb->Sk) == 0) &&\r | |
120db52c | 809 | TCP_SEQ_LT (End + 1, Tcb->SndWnd + Tcb->SndWl2)) {\r |
8a67d61d | 810 | \r |
e48e37fc | 811 | DEBUG ((EFI_D_INFO, "TcpToSendData: send FIN "\r |
0e549d5b | 812 | "to peer for TCB %p in state %d\n", Tcb, Tcb->State));\r |
8a67d61d | 813 | \r |
814 | End++;\r | |
815 | } else {\r | |
816 | TCP_CLEAR_FLG (Flag, TCP_FLG_FIN);\r | |
817 | }\r | |
818 | }\r | |
819 | \r | |
820 | Seg->Seq = Seq;\r | |
821 | Seg->End = End;\r | |
822 | Seg->Flag = Flag;\r | |
823 | \r | |
120db52c | 824 | ASSERT (TcpVerifySegment (Nbuf) != 0);\r |
825 | ASSERT (TcpCheckSndQue (&Tcb->SndQue) != 0);\r | |
8a67d61d | 826 | \r |
827 | //\r | |
828 | // don't send an empty segment here.\r | |
829 | //\r | |
830 | if (Seg->End == Seg->Seq) {\r | |
e48e37fc | 831 | DEBUG ((EFI_D_WARN, "TcpToSendData: created a empty"\r |
0e549d5b | 832 | " segment for TCB %p, free it now\n", Tcb));\r |
8a67d61d | 833 | \r |
834 | NetbufFree (Nbuf);\r | |
835 | return Sent;\r | |
836 | }\r | |
837 | \r | |
838 | if (TcpTransmitSegment (Tcb, Nbuf) != 0) {\r | |
839 | //\r | |
840 | // TODO: double check this\r | |
841 | //\r | |
842 | NetbufTrim (Nbuf, (Nbuf->Tcp->HeadLen << 2), NET_BUF_HEAD);\r | |
843 | Nbuf->Tcp = NULL;\r | |
844 | \r | |
85511ddf | 845 | if ((Flag & TCP_FLG_FIN) != 0) {\r |
8a67d61d | 846 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_FIN_SENT);\r |
847 | }\r | |
848 | \r | |
849 | goto OnError;\r | |
850 | }\r | |
851 | \r | |
852 | Sent += TCP_SUB_SEQ (End, Seq);\r | |
853 | \r | |
854 | //\r | |
855 | // All the buffer in the SndQue is headless\r | |
856 | //\r | |
120db52c | 857 | ASSERT (Nbuf->Tcp != NULL);\r |
8a67d61d | 858 | \r |
859 | NetbufTrim (Nbuf, (Nbuf->Tcp->HeadLen << 2), NET_BUF_HEAD);\r | |
860 | Nbuf->Tcp = NULL;\r | |
861 | \r | |
862 | NetbufFree (Nbuf);\r | |
863 | \r | |
864 | //\r | |
865 | // update status in TCB\r | |
866 | //\r | |
867 | Tcb->DelayedAck = 0;\r | |
868 | \r | |
85511ddf | 869 | if ((Flag & TCP_FLG_FIN) != 0) {\r |
8a67d61d | 870 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_FIN_SENT);\r |
871 | }\r | |
872 | \r | |
873 | if (TCP_SEQ_GT (End, Tcb->SndNxt)) {\r | |
874 | Tcb->SndNxt = End;\r | |
875 | }\r | |
876 | \r | |
877 | if (!TCP_TIMER_ON (Tcb->EnabledTimer, TCP_TIMER_REXMIT)) {\r | |
878 | TcpSetTimer (Tcb, TCP_TIMER_REXMIT, Tcb->Rto);\r | |
879 | }\r | |
880 | \r | |
881 | //\r | |
882 | // Enable RTT measurement only if not in retransmit.\r | |
883 | // Karn's algorithm reqires not to update RTT when in loss.\r | |
884 | //\r | |
885 | if ((Tcb->CongestState == TCP_CONGEST_OPEN) &&\r | |
886 | !TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RTT_ON)) {\r | |
887 | \r | |
e48e37fc | 888 | DEBUG ((EFI_D_INFO, "TcpToSendData: set RTT measure "\r |
0e549d5b | 889 | "sequence %d for TCB %p\n", Seq, Tcb));\r |
8a67d61d | 890 | \r |
891 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
892 | Tcb->RttSeq = Seq;\r | |
893 | Tcb->RttMeasure = 0;\r | |
894 | }\r | |
895 | \r | |
896 | if (Len == Tcb->SndMss) {\r | |
897 | goto SEND_AGAIN;\r | |
898 | }\r | |
899 | \r | |
900 | return Sent;\r | |
901 | \r | |
902 | OnError:\r | |
903 | if (Nbuf != NULL) {\r | |
904 | NetbufFree (Nbuf);\r | |
905 | }\r | |
906 | \r | |
907 | return Sent;\r | |
908 | }\r | |
909 | \r | |
910 | \r | |
911 | /**\r | |
912 | Send an ACK immediately.\r | |
913 | \r | |
914 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
915 | \r | |
8a67d61d | 916 | **/\r |
917 | VOID\r | |
918 | TcpSendAck (\r | |
919 | IN TCP_CB *Tcb\r | |
920 | )\r | |
921 | {\r | |
922 | NET_BUF *Nbuf;\r | |
923 | TCP_SEG *Seg;\r | |
924 | \r | |
925 | Nbuf = NetbufAlloc (TCP_MAX_HEAD);\r | |
926 | \r | |
927 | if (Nbuf == NULL) {\r | |
928 | return;\r | |
929 | }\r | |
930 | \r | |
931 | NetbufReserve (Nbuf, TCP_MAX_HEAD);\r | |
932 | \r | |
933 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
934 | Seg->Seq = Tcb->SndNxt;\r | |
935 | Seg->End = Tcb->SndNxt;\r | |
936 | Seg->Flag = TCP_FLG_ACK;\r | |
937 | \r | |
938 | if (TcpTransmitSegment (Tcb, Nbuf) == 0) {\r | |
939 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW);\r | |
940 | Tcb->DelayedAck = 0;\r | |
941 | }\r | |
942 | \r | |
943 | NetbufFree (Nbuf);\r | |
944 | }\r | |
945 | \r | |
946 | \r | |
947 | /**\r | |
120db52c | 948 | Send a zero probe segment. It can be used by keepalive and zero window probe.\r |
8a67d61d | 949 | \r |
950 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
951 | \r | |
952 | @retval 0 The zero probe segment was sent out successfully.\r | |
953 | @retval other Error condition occurred.\r | |
954 | \r | |
955 | **/\r | |
956 | INTN\r | |
957 | TcpSendZeroProbe (\r | |
958 | IN TCP_CB *Tcb\r | |
959 | )\r | |
960 | {\r | |
961 | NET_BUF *Nbuf;\r | |
962 | TCP_SEG *Seg;\r | |
963 | INTN Result;\r | |
964 | \r | |
965 | Nbuf = NetbufAlloc (TCP_MAX_HEAD);\r | |
966 | \r | |
967 | if (Nbuf == NULL) {\r | |
968 | return -1;\r | |
969 | }\r | |
970 | \r | |
971 | NetbufReserve (Nbuf, TCP_MAX_HEAD);\r | |
972 | \r | |
973 | //\r | |
974 | // SndNxt-1 is out of window. The peer should respond\r | |
975 | // with an ACK.\r | |
976 | //\r | |
977 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
978 | Seg->Seq = Tcb->SndNxt - 1;\r | |
979 | Seg->End = Tcb->SndNxt - 1;\r | |
980 | Seg->Flag = TCP_FLG_ACK;\r | |
981 | \r | |
982 | Result = TcpTransmitSegment (Tcb, Nbuf);\r | |
983 | NetbufFree (Nbuf);\r | |
984 | \r | |
985 | return Result;\r | |
986 | }\r | |
987 | \r | |
988 | \r | |
989 | /**\r | |
990 | Check whether to send an ACK or delayed ACK.\r | |
991 | \r | |
992 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
993 | \r | |
8a67d61d | 994 | **/\r |
995 | VOID\r | |
996 | TcpToSendAck (\r | |
997 | IN TCP_CB *Tcb\r | |
998 | )\r | |
999 | {\r | |
4eb65aff | 1000 | UINT32 TcpNow;\r |
1001 | \r | |
1002 | TcpNow = TcpRcvWinNow (Tcb);\r | |
8a67d61d | 1003 | //\r |
1004 | // Generally, TCP should send a delayed ACK unless:\r | |
1005 | // 1. ACK at least every other FULL sized segment received,\r | |
1006 | // 2. Packets received out of order\r | |
1007 | // 3. Receiving window is open\r | |
1008 | //\r | |
1009 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_ACK_NOW) ||\r | |
1010 | (Tcb->DelayedAck >= 1) ||\r | |
120db52c | 1011 | (TcpNow > TcpRcvWinOld (Tcb))) {\r |
8a67d61d | 1012 | TcpSendAck (Tcb);\r |
1013 | return;\r | |
1014 | }\r | |
1015 | \r | |
e48e37fc | 1016 | DEBUG ((EFI_D_INFO, "TcpToSendAck: scheduled a delayed"\r |
0e549d5b | 1017 | " ACK for TCB %p\n", Tcb));\r |
8a67d61d | 1018 | \r |
1019 | //\r | |
1020 | // schedule a delayed ACK\r | |
1021 | //\r | |
1022 | Tcb->DelayedAck++;\r | |
1023 | }\r | |
1024 | \r | |
1025 | \r | |
1026 | /**\r | |
1027 | Send a RESET segment in response to the segment received.\r | |
1028 | \r | |
1029 | @param Tcb Pointer to the TCP_CB of this TCP instance, may be NULL.\r | |
1030 | @param Head TCP header of the segment that triggers the reset.\r | |
1031 | @param Len Length of the segment that triggers the reset.\r | |
1032 | @param Local Local IP address.\r | |
1033 | @param Remote Remote peer's IP address.\r | |
1034 | \r | |
1035 | @retval 0 A reset is sent or no need to send it.\r | |
1036 | @retval -1 No reset is sent.\r | |
1037 | \r | |
1038 | **/\r | |
1039 | INTN\r | |
1040 | TcpSendReset (\r | |
1041 | IN TCP_CB *Tcb,\r | |
1042 | IN TCP_HEAD *Head,\r | |
1043 | IN INT32 Len,\r | |
1044 | IN UINT32 Local,\r | |
1045 | IN UINT32 Remote\r | |
1046 | )\r | |
1047 | {\r | |
1048 | NET_BUF *Nbuf;\r | |
1049 | TCP_HEAD *Nhead;\r | |
1050 | UINT16 HeadSum;\r | |
1051 | \r | |
1052 | //\r | |
1053 | // Don't respond to a Reset with reset\r | |
1054 | //\r | |
120db52c | 1055 | if ((Head->Flag & TCP_FLG_RST) != 0) {\r |
8a67d61d | 1056 | return 0;\r |
1057 | }\r | |
1058 | \r | |
1059 | Nbuf = NetbufAlloc (TCP_MAX_HEAD);\r | |
1060 | \r | |
1061 | if (Nbuf == NULL) {\r | |
1062 | return -1;\r | |
1063 | }\r | |
1064 | \r | |
1065 | Nhead = (TCP_HEAD *) NetbufAllocSpace (\r | |
1066 | Nbuf,\r | |
1067 | sizeof (TCP_HEAD),\r | |
1068 | NET_BUF_TAIL\r | |
1069 | );\r | |
1070 | \r | |
1071 | ASSERT (Nhead != NULL);\r | |
1072 | \r | |
1073 | Nbuf->Tcp = Nhead;\r | |
1074 | Nhead->Flag = TCP_FLG_RST;\r | |
1075 | \r | |
1076 | //\r | |
1077 | // Derive Seq/ACK from the segment if no TCB\r | |
1078 | // associated with it, otherwise from the Tcb\r | |
1079 | //\r | |
1080 | if (Tcb == NULL) {\r | |
1081 | \r | |
1082 | if (TCP_FLG_ON (Head->Flag, TCP_FLG_ACK)) {\r | |
1083 | Nhead->Seq = Head->Ack;\r | |
1084 | Nhead->Ack = 0;\r | |
1085 | } else {\r | |
1086 | Nhead->Seq = 0;\r | |
1087 | TCP_SET_FLG (Nhead->Flag, TCP_FLG_ACK);\r | |
1088 | Nhead->Ack = HTONL (NTOHL (Head->Seq) + Len);\r | |
1089 | }\r | |
1090 | } else {\r | |
1091 | \r | |
1092 | Nhead->Seq = HTONL (Tcb->SndNxt);\r | |
1093 | Nhead->Ack = HTONL (Tcb->RcvNxt);\r | |
1094 | TCP_SET_FLG (Nhead->Flag, TCP_FLG_ACK);\r | |
1095 | }\r | |
1096 | \r | |
1097 | Nhead->SrcPort = Head->DstPort;\r | |
1098 | Nhead->DstPort = Head->SrcPort;\r | |
1099 | Nhead->HeadLen = (sizeof (TCP_HEAD) >> 2);\r | |
1100 | Nhead->Res = 0;\r | |
1101 | Nhead->Wnd = HTONS (0xFFFF);\r | |
1102 | Nhead->Checksum = 0;\r | |
1103 | Nhead->Urg = 0;\r | |
1104 | \r | |
1105 | HeadSum = NetPseudoHeadChecksum (Local, Remote, 6, 0);\r | |
1106 | Nhead->Checksum = TcpChecksum (Nbuf, HeadSum);\r | |
1107 | \r | |
1108 | TcpSendIpPacket (Tcb, Nbuf, Local, Remote);\r | |
1109 | \r | |
1110 | NetbufFree (Nbuf);\r | |
1111 | return 0;\r | |
1112 | }\r | |
1113 | \r | |
1114 | \r | |
1115 | /**\r | |
1116 | Verify that the segment is in good shape.\r | |
1117 | \r | |
1118 | @param Nbuf Buffer that contains the segment to be checked.\r | |
1119 | \r | |
1120 | @retval 0 The segment is broken.\r | |
1121 | @retval 1 The segment is in good shape.\r | |
1122 | \r | |
1123 | **/\r | |
1124 | INTN\r | |
1125 | TcpVerifySegment (\r | |
1126 | IN NET_BUF *Nbuf\r | |
1127 | )\r | |
1128 | {\r | |
1129 | TCP_HEAD *Head;\r | |
1130 | TCP_SEG *Seg;\r | |
1131 | UINT32 Len;\r | |
1132 | \r | |
1133 | if (Nbuf == NULL) {\r | |
1134 | return 1;\r | |
1135 | }\r | |
1136 | \r | |
1137 | NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r | |
1138 | \r | |
1139 | Seg = TCPSEG_NETBUF (Nbuf);\r | |
1140 | Len = Nbuf->TotalSize;\r | |
1141 | Head = Nbuf->Tcp;\r | |
1142 | \r | |
1143 | if (Head != NULL) {\r | |
1144 | if (Head->Flag != Seg->Flag) {\r | |
1145 | return 0;\r | |
1146 | }\r | |
1147 | \r | |
1148 | Len -= (Head->HeadLen << 2);\r | |
1149 | }\r | |
1150 | \r | |
1151 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_SYN)) {\r | |
1152 | Len++;\r | |
1153 | }\r | |
1154 | \r | |
1155 | if (TCP_FLG_ON (Seg->Flag, TCP_FLG_FIN)) {\r | |
1156 | Len++;\r | |
1157 | }\r | |
1158 | \r | |
1159 | if (Seg->Seq + Len != Seg->End) {\r | |
1160 | return 0;\r | |
1161 | }\r | |
1162 | \r | |
1163 | return 1;\r | |
1164 | }\r | |
1165 | \r | |
1166 | \r | |
1167 | /**\r | |
1168 | Verify that all the segments in SndQue are in good shape.\r | |
1169 | \r | |
1170 | @param Head Pointer to the head node of the SndQue.\r | |
1171 | \r | |
1172 | @retval 0 At least one segment is broken.\r | |
1173 | @retval 1 All segments in the specific queue are in good shape.\r | |
1174 | \r | |
1175 | **/\r | |
1176 | INTN\r | |
1177 | TcpCheckSndQue (\r | |
e48e37fc | 1178 | IN LIST_ENTRY *Head\r |
8a67d61d | 1179 | )\r |
1180 | {\r | |
e48e37fc | 1181 | LIST_ENTRY *Entry;\r |
8a67d61d | 1182 | NET_BUF *Nbuf;\r |
1183 | TCP_SEQNO Seq;\r | |
1184 | \r | |
e48e37fc | 1185 | if (IsListEmpty (Head)) {\r |
8a67d61d | 1186 | return 1;\r |
1187 | }\r | |
1188 | //\r | |
1189 | // Initialize the Seq\r | |
1190 | //\r | |
1191 | Entry = Head->ForwardLink;\r | |
1192 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1193 | Seq = TCPSEG_NETBUF (Nbuf)->Seq;\r | |
1194 | \r | |
1195 | NET_LIST_FOR_EACH (Entry, Head) {\r | |
1196 | Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r | |
1197 | \r | |
1198 | if (TcpVerifySegment (Nbuf) == 0) {\r | |
1199 | return 0;\r | |
1200 | }\r | |
1201 | \r | |
1202 | //\r | |
1203 | // All the node in the SndQue should has:\r | |
1204 | // SEG.SEQ = LAST_SEG.END\r | |
1205 | //\r | |
1206 | if (Seq != TCPSEG_NETBUF (Nbuf)->Seq) {\r | |
1207 | return 0;\r | |
1208 | }\r | |
1209 | \r | |
1210 | Seq = TCPSEG_NETBUF (Nbuf)->End;\r | |
1211 | }\r | |
1212 | \r | |
1213 | return 1;\r | |
1214 | }\r |