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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 | Tcp4Option.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | Routines to process TCP option.\r | |
19 | \r | |
20 | \r | |
21 | **/\r | |
22 | \r | |
23 | #include "Tcp4Main.h"\r | |
24 | \r | |
25 | STATIC\r | |
26 | UINT16\r | |
27 | TcpGetUint16 (\r | |
28 | IN UINT8 *Buf\r | |
29 | )\r | |
30 | {\r | |
31 | UINT16 Value;\r | |
32 | NetCopyMem (&Value, Buf, sizeof (UINT16));\r | |
33 | return NTOHS (Value);\r | |
34 | }\r | |
35 | \r | |
36ee91ca | 36 | STATIC\r |
8a67d61d | 37 | VOID\r |
38 | TcpPutUint16 (\r | |
39 | IN UINT8 *Buf,\r | |
40 | IN UINT16 Data\r | |
41 | )\r | |
42 | {\r | |
43 | Data = HTONS (Data);\r | |
44 | NetCopyMem (Buf, &Data, sizeof (UINT16));\r | |
45 | }\r | |
46 | \r | |
47 | STATIC\r | |
48 | UINT32\r | |
49 | TcpGetUint32 (\r | |
50 | IN UINT8 *Buf\r | |
51 | )\r | |
52 | {\r | |
53 | UINT32 Value;\r | |
54 | NetCopyMem (&Value, Buf, sizeof (UINT32));\r | |
55 | return NTOHL (Value);\r | |
56 | }\r | |
57 | \r | |
58 | STATIC\r | |
59 | VOID\r | |
60 | TcpPutUint32 (\r | |
61 | IN UINT8 *Buf,\r | |
62 | IN UINT32 Data\r | |
63 | )\r | |
64 | {\r | |
65 | Data = HTONL (Data);\r | |
66 | NetCopyMem (Buf, &Data, sizeof (UINT32));\r | |
67 | }\r | |
68 | \r | |
69 | \r | |
70 | /**\r | |
71 | Compute the window scale value according to the given\r | |
72 | buffer size.\r | |
73 | \r | |
74 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
75 | \r | |
76 | @retval UINT8 The scale value.\r | |
77 | \r | |
78 | **/\r | |
79 | UINT8\r | |
80 | TcpComputeScale (\r | |
81 | IN TCP_CB *Tcb\r | |
82 | )\r | |
83 | {\r | |
84 | UINT8 Scale;\r | |
85 | UINT32 BufSize;\r | |
86 | \r | |
87 | ASSERT (Tcb && Tcb->Sk);\r | |
88 | \r | |
89 | BufSize = GET_RCV_BUFFSIZE (Tcb->Sk);\r | |
90 | \r | |
91 | Scale = 0;\r | |
92 | while ((Scale < TCP_OPTION_MAX_WS) &&\r | |
93 | ((UINT32) (TCP_OPTION_MAX_WIN << Scale) < BufSize)) {\r | |
94 | \r | |
95 | Scale++;\r | |
96 | }\r | |
97 | \r | |
98 | return Scale;\r | |
99 | }\r | |
100 | \r | |
101 | \r | |
102 | /**\r | |
103 | Build the TCP option in three-way handshake.\r | |
104 | \r | |
105 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
106 | @param Nbuf Pointer to the buffer to store the options.\r | |
107 | \r | |
108 | @return The total length of the TCP option field.\r | |
109 | \r | |
110 | **/\r | |
111 | UINT16\r | |
112 | TcpSynBuildOption (\r | |
113 | IN TCP_CB *Tcb,\r | |
114 | IN NET_BUF *Nbuf\r | |
115 | )\r | |
116 | {\r | |
4eb65aff | 117 | UINT8 *Data;\r |
8a67d61d | 118 | UINT16 Len;\r |
119 | \r | |
120 | ASSERT (Tcb && Nbuf && !Nbuf->Tcp);\r | |
121 | \r | |
122 | Len = 0;\r | |
123 | \r | |
124 | //\r | |
125 | // Add timestamp option if not disabled by application\r | |
126 | // and it is the first SYN segment or the peer has sent\r | |
127 | // us its timestamp.\r | |
128 | //\r | |
129 | if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_NO_TS) &&\r | |
130 | (!TCP_FLG_ON (TCPSEG_NETBUF (Nbuf)->Flag, TCP_FLG_ACK) ||\r | |
131 | TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_TS))) {\r | |
132 | \r | |
133 | Data = NetbufAllocSpace (\r | |
134 | Nbuf,\r | |
135 | TCP_OPTION_TS_ALIGNED_LEN,\r | |
136 | NET_BUF_HEAD\r | |
137 | );\r | |
138 | \r | |
139 | ASSERT (Data);\r | |
140 | Len += TCP_OPTION_TS_ALIGNED_LEN;\r | |
141 | \r | |
142 | TcpPutUint32 (Data, TCP_OPTION_TS_FAST);\r | |
143 | TcpPutUint32 (Data + 4, mTcpTick);\r | |
144 | TcpPutUint32 (Data + 8, 0);\r | |
145 | }\r | |
146 | \r | |
147 | //\r | |
148 | // Build window scale option, only when are configured\r | |
149 | // to send WS option, and either we are doing active\r | |
150 | // open or we have received WS option from peer.\r | |
151 | //\r | |
152 | if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_NO_WS) &&\r | |
153 | (!TCP_FLG_ON (TCPSEG_NETBUF (Nbuf)->Flag, TCP_FLG_ACK) ||\r | |
154 | TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_WS))) {\r | |
155 | \r | |
156 | Data = NetbufAllocSpace (\r | |
157 | Nbuf,\r | |
158 | TCP_OPTION_WS_ALIGNED_LEN,\r | |
159 | NET_BUF_HEAD\r | |
160 | );\r | |
161 | \r | |
162 | ASSERT (Data);\r | |
163 | \r | |
164 | Len += TCP_OPTION_WS_ALIGNED_LEN;\r | |
165 | TcpPutUint32 (Data, TCP_OPTION_WS_FAST | TcpComputeScale (Tcb));\r | |
166 | }\r | |
167 | \r | |
168 | //\r | |
169 | // Build MSS option\r | |
170 | //\r | |
171 | Data = NetbufAllocSpace (Nbuf, TCP_OPTION_MSS_LEN, 1);\r | |
172 | ASSERT (Data);\r | |
173 | \r | |
174 | Len += TCP_OPTION_MSS_LEN;\r | |
175 | TcpPutUint32 (Data, TCP_OPTION_MSS_FAST | Tcb->RcvMss);\r | |
176 | \r | |
177 | return Len;\r | |
178 | }\r | |
179 | \r | |
180 | \r | |
181 | /**\r | |
182 | Build the TCP option in synchronized states.\r | |
183 | \r | |
184 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
185 | @param Nbuf Pointer to the buffer to store the options.\r | |
186 | \r | |
187 | @return The total length of the TCP option field.\r | |
188 | \r | |
189 | **/\r | |
190 | UINT16\r | |
191 | TcpBuildOption (\r | |
192 | IN TCP_CB *Tcb,\r | |
193 | IN NET_BUF *Nbuf\r | |
194 | )\r | |
195 | {\r | |
4eb65aff | 196 | UINT8 *Data;\r |
8a67d61d | 197 | UINT16 Len;\r |
198 | \r | |
199 | ASSERT (Tcb && Nbuf && !Nbuf->Tcp);\r | |
200 | Len = 0;\r | |
201 | \r | |
202 | //\r | |
203 | // Build Timestamp option\r | |
204 | //\r | |
205 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_SND_TS) &&\r | |
206 | !TCP_FLG_ON (TCPSEG_NETBUF (Nbuf)->Flag, TCP_FLG_RST)) {\r | |
207 | \r | |
208 | Data = NetbufAllocSpace (\r | |
209 | Nbuf,\r | |
210 | TCP_OPTION_TS_ALIGNED_LEN,\r | |
211 | NET_BUF_HEAD\r | |
212 | );\r | |
213 | \r | |
214 | ASSERT (Data);\r | |
215 | Len += TCP_OPTION_TS_ALIGNED_LEN;\r | |
216 | \r | |
217 | TcpPutUint32 (Data, TCP_OPTION_TS_FAST);\r | |
218 | TcpPutUint32 (Data + 4, mTcpTick);\r | |
219 | TcpPutUint32 (Data + 8, Tcb->TsRecent);\r | |
220 | }\r | |
221 | \r | |
222 | return Len;\r | |
223 | }\r | |
224 | \r | |
225 | \r | |
226 | /**\r | |
227 | Parse the supported options.\r | |
228 | \r | |
229 | @param Tcp Pointer to the TCP_CB of this TCP instance.\r | |
230 | @param Option Pointer to the TCP_OPTION used to store the successfully pasrsed\r | |
231 | options.\r | |
232 | \r | |
233 | @retval 0 The options are successfully pasrsed.\r | |
234 | @retval -1 Ilegal option was found.\r | |
235 | \r | |
236 | **/\r | |
237 | INTN\r | |
238 | TcpParseOption (\r | |
239 | IN TCP_HEAD *Tcp,\r | |
240 | IN TCP_OPTION *Option\r | |
241 | )\r | |
242 | {\r | |
243 | UINT8 *Head;\r | |
244 | UINT8 TotalLen;\r | |
245 | UINT8 Cur;\r | |
246 | UINT8 Type;\r | |
247 | UINT8 Len;\r | |
248 | \r | |
249 | ASSERT (Tcp && Option);\r | |
250 | \r | |
251 | Option->Flag = 0;\r | |
252 | \r | |
d074a8e1 | 253 | TotalLen = (UINT8) ((Tcp->HeadLen << 2) - sizeof (TCP_HEAD));\r |
8a67d61d | 254 | if (TotalLen <= 0) {\r |
255 | return 0;\r | |
256 | }\r | |
257 | \r | |
258 | Head = (UINT8 *) (Tcp + 1);\r | |
259 | \r | |
260 | //\r | |
261 | // Fast process of timestamp option\r | |
262 | //\r | |
263 | if ((TotalLen == TCP_OPTION_TS_ALIGNED_LEN) &&\r | |
264 | (TcpGetUint32 (Head) == TCP_OPTION_TS_FAST)) {\r | |
265 | \r | |
266 | Option->TSVal = TcpGetUint32 (Head + 4);\r | |
267 | Option->TSEcr = TcpGetUint32 (Head + 8);\r | |
268 | Option->Flag = TCP_OPTION_RCVD_TS;\r | |
269 | \r | |
270 | return 0;\r | |
271 | }\r | |
272 | \r | |
273 | //\r | |
274 | // Slow path to process the options.\r | |
275 | //\r | |
276 | Cur = 0;\r | |
277 | \r | |
278 | while (Cur < TotalLen) {\r | |
279 | Type = Head[Cur];\r | |
280 | \r | |
281 | switch (Type) {\r | |
282 | case TCP_OPTION_MSS:\r | |
283 | Len = Head[Cur + 1];\r | |
284 | \r | |
285 | if ((Len != TCP_OPTION_MSS_LEN) ||\r | |
286 | (TotalLen - Cur < TCP_OPTION_MSS_LEN)) {\r | |
287 | \r | |
288 | return -1;\r | |
289 | }\r | |
290 | \r | |
291 | Option->Mss = TcpGetUint16 (&Head[Cur + 2]);\r | |
292 | TCP_SET_FLG (Option->Flag, TCP_OPTION_RCVD_MSS);\r | |
293 | \r | |
294 | Cur += TCP_OPTION_MSS_LEN;\r | |
295 | break;\r | |
296 | \r | |
297 | case TCP_OPTION_WS:\r | |
298 | Len = Head[Cur + 1];\r | |
299 | \r | |
300 | if ((Len != TCP_OPTION_WS_LEN) ||\r | |
301 | (TotalLen - Cur < TCP_OPTION_WS_LEN)) {\r | |
302 | \r | |
303 | return -1;\r | |
304 | }\r | |
305 | \r | |
36ee91ca | 306 | Option->WndScale = (UINT8) MIN (14, Head[Cur + 2]);\r |
8a67d61d | 307 | TCP_SET_FLG (Option->Flag, TCP_OPTION_RCVD_WS);\r |
308 | \r | |
309 | Cur += TCP_OPTION_WS_LEN;\r | |
310 | break;\r | |
311 | \r | |
312 | case TCP_OPTION_TS:\r | |
313 | Len = Head[Cur + 1];\r | |
314 | \r | |
315 | if ((Len != TCP_OPTION_TS_LEN) ||\r | |
316 | (TotalLen - Cur < TCP_OPTION_TS_LEN)) {\r | |
317 | \r | |
318 | return -1;\r | |
319 | }\r | |
320 | \r | |
321 | Option->TSVal = TcpGetUint32 (&Head[Cur + 2]);\r | |
322 | Option->TSEcr = TcpGetUint32 (&Head[Cur + 6]);\r | |
323 | TCP_SET_FLG (Option->Flag, TCP_OPTION_RCVD_TS);\r | |
324 | \r | |
325 | Cur += TCP_OPTION_TS_LEN;\r | |
326 | break;\r | |
327 | \r | |
328 | case TCP_OPTION_NOP:\r | |
329 | Cur++;\r | |
330 | break;\r | |
331 | \r | |
332 | case TCP_OPTION_EOP:\r | |
333 | Cur = TotalLen;\r | |
334 | break;\r | |
335 | \r | |
336 | default:\r | |
337 | Len = Head[Cur + 1];\r | |
338 | \r | |
339 | if (TotalLen - Cur < Len || Len < 2) {\r | |
340 | return -1;\r | |
341 | }\r | |
342 | \r | |
4eb65aff | 343 | Cur = (UINT8) (Cur + Len);\r |
8a67d61d | 344 | break;\r |
345 | }\r | |
346 | \r | |
347 | }\r | |
348 | \r | |
349 | return 0;\r | |
350 | }\r | |
351 | \r | |
352 | \r | |
353 | /**\r | |
354 | Check the segment against PAWS.\r | |
355 | \r | |
356 | @param Tcb Pointer to the TCP_CB of this TCP instance.\r | |
357 | @param TSVal The timestamp value.\r | |
358 | \r | |
359 | @retval 1 The segment passed the PAWS check.\r | |
360 | @retval 0 The segment failed to pass the PAWS check.\r | |
361 | \r | |
362 | **/\r | |
363 | UINT32\r | |
364 | TcpPawsOK (\r | |
365 | IN TCP_CB *Tcb,\r | |
366 | IN UINT32 TSVal\r | |
367 | )\r | |
368 | {\r | |
369 | //\r | |
370 | // PAWS as defined in RFC1323, buggy...\r | |
371 | //\r | |
372 | if (TCP_TIME_LT (TSVal, Tcb->TsRecent) &&\r | |
373 | TCP_TIME_LT (Tcb->TsRecentAge + TCP_PAWS_24DAY, mTcpTick)) {\r | |
374 | \r | |
375 | return 0;\r | |
376 | \r | |
377 | }\r | |
378 | \r | |
379 | return 1;\r | |
380 | }\r |