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772db4bb | 1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2004, 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 | \r | |
13 | **/\r | |
14 | \r | |
15 | \r | |
16 | #define RAND_MAX 0x10000\r | |
17 | \r | |
18 | #include "Bc.h"\r | |
19 | \r | |
20 | //\r | |
21 | // Definitions for internet group management protocol version 2 message\r | |
22 | // structure Per RFC 2236, November 1997\r | |
23 | //\r | |
24 | STATIC UINT8 RouterAlertOption[4] = { 0x80 | 20, 4, 0, 0 };\r | |
25 | STATIC IPV4_ADDR AllRoutersGroup = { { 224, 0, 0, 2 } };\r | |
26 | \r | |
27 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
28 | STATIC\r | |
29 | VOID\r | |
30 | ClearGroupTimer (\r | |
31 | PXE_BASECODE_DEVICE *Private,\r | |
32 | UINTN TimerId\r | |
33 | )\r | |
34 | {\r | |
35 | if (Private == NULL) {\r | |
36 | return ;\r | |
37 | }\r | |
38 | \r | |
39 | if (TimerId >= Private->MCastGroupCount) {\r | |
40 | return ;\r | |
41 | }\r | |
42 | \r | |
43 | if (Private->IgmpGroupEvent[TimerId] == NULL) {\r | |
44 | return ;\r | |
45 | }\r | |
46 | \r | |
47 | gBS->CloseEvent (Private->IgmpGroupEvent[TimerId]);\r | |
48 | Private->IgmpGroupEvent[TimerId] = NULL;\r | |
49 | }\r | |
50 | \r | |
51 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
52 | \r | |
53 | /**\r | |
54 | \r | |
55 | \r | |
56 | **/\r | |
57 | STATIC\r | |
58 | VOID\r | |
59 | SetGroupTimer (\r | |
60 | PXE_BASECODE_DEVICE *Private,\r | |
61 | UINTN TimerId,\r | |
62 | UINTN MaxRespTime\r | |
63 | )\r | |
64 | {\r | |
65 | EFI_STATUS EfiStatus;\r | |
66 | \r | |
67 | if (Private == NULL) {\r | |
68 | return ;\r | |
69 | }\r | |
70 | \r | |
71 | if (TimerId >= Private->MCastGroupCount) {\r | |
72 | return ;\r | |
73 | }\r | |
74 | \r | |
75 | if (Private->IgmpGroupEvent[TimerId] != NULL) {\r | |
76 | gBS->CloseEvent (Private->IgmpGroupEvent[TimerId]);\r | |
77 | }\r | |
78 | \r | |
79 | EfiStatus = gBS->CreateEvent (\r | |
80 | EVT_TIMER,\r | |
81 | TPL_CALLBACK,\r | |
82 | NULL,\r | |
83 | NULL,\r | |
84 | &Private->IgmpGroupEvent[TimerId]\r | |
85 | );\r | |
86 | \r | |
87 | if (EFI_ERROR (EfiStatus)) {\r | |
88 | Private->IgmpGroupEvent[TimerId] = NULL;\r | |
89 | return ;\r | |
90 | }\r | |
91 | \r | |
92 | EfiStatus = gBS->SetTimer (\r | |
93 | Private->IgmpGroupEvent[TimerId],\r | |
94 | TimerRelative,\r | |
95 | MaxRespTime * 1000000 + Random (Private) % RAND_MAX\r | |
96 | );\r | |
97 | \r | |
98 | if (EFI_ERROR (EfiStatus)) {\r | |
99 | gBS->CloseEvent (Private->IgmpGroupEvent[TimerId]);\r | |
100 | Private->IgmpGroupEvent[TimerId] = NULL;\r | |
101 | }\r | |
102 | }\r | |
103 | \r | |
104 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
105 | \r | |
106 | /**\r | |
107 | \r | |
108 | \r | |
109 | **/\r | |
110 | STATIC\r | |
111 | VOID\r | |
112 | SendIgmpMessage (\r | |
113 | PXE_BASECODE_DEVICE *Private,\r | |
114 | UINT8 Type,\r | |
115 | INTN GroupId\r | |
116 | )\r | |
117 | {\r | |
118 | Private->IgmpMessage.Type = Type;\r | |
119 | Private->IgmpMessage.MaxRespTime = 0;\r | |
120 | Private->IgmpMessage.Checksum = 0;\r | |
121 | Private->IgmpMessage.GroupAddress = Private->MCastGroup[GroupId];\r | |
122 | Private->IgmpMessage.Checksum = IpChecksum (\r | |
123 | (UINT16 *) &Private->IgmpMessage,\r | |
124 | sizeof Private->IgmpMessage\r | |
125 | );\r | |
126 | \r | |
127 | Ipv4SendWOp (\r | |
128 | Private,\r | |
129 | 0,\r | |
130 | (UINT8 *) &Private->IgmpMessage,\r | |
131 | sizeof Private->IgmpMessage,\r | |
132 | PROT_IGMP,\r | |
133 | RouterAlertOption,\r | |
134 | sizeof RouterAlertOption,\r | |
135 | ((Type == IGMP_TYPE_LEAVE_GROUP) ? AllRoutersGroup.L : Private->IgmpMessage.GroupAddress),\r | |
136 | EFI_PXE_BASE_CODE_FUNCTION_IGMP\r | |
137 | );\r | |
138 | }\r | |
139 | \r | |
140 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
141 | \r | |
142 | /**\r | |
143 | \r | |
144 | \r | |
145 | **/\r | |
146 | STATIC\r | |
147 | VOID\r | |
148 | ReportIgmp (\r | |
149 | PXE_BASECODE_DEVICE *Private,\r | |
150 | INTN GroupId\r | |
151 | )\r | |
152 | {\r | |
153 | //\r | |
154 | // if version 1 querier, send v1 report\r | |
155 | //\r | |
156 | UINT8 Type;\r | |
157 | \r | |
158 | if (Private->Igmpv1TimeoutEvent != NULL) {\r | |
159 | if (!EFI_ERROR (gBS->CheckEvent (Private->Igmpv1TimeoutEvent))) {\r | |
160 | gBS->CloseEvent (Private->Igmpv1TimeoutEvent);\r | |
161 | Private->Igmpv1TimeoutEvent = NULL;\r | |
162 | Private->UseIgmpv1Reporting = TRUE;\r | |
163 | }\r | |
164 | }\r | |
165 | \r | |
166 | Type = (UINT8) (Private->UseIgmpv1Reporting ? IGMP_TYPE_V1REPORT : IGMP_TYPE_REPORT);\r | |
167 | \r | |
168 | SendIgmpMessage (Private, Type, GroupId);\r | |
169 | ClearGroupTimer (Private, GroupId);\r | |
170 | }\r | |
171 | \r | |
172 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
173 | \r | |
174 | /**\r | |
175 | \r | |
176 | \r | |
177 | **/\r | |
178 | VOID\r | |
179 | IgmpCheckTimers (\r | |
180 | PXE_BASECODE_DEVICE *Private\r | |
181 | )\r | |
182 | {\r | |
183 | UINTN GroupId;\r | |
184 | \r | |
185 | if (Private == NULL) {\r | |
186 | return ;\r | |
187 | }\r | |
188 | \r | |
189 | for (GroupId = 0; GroupId < Private->MCastGroupCount; ++GroupId) {\r | |
190 | if (Private->IgmpGroupEvent[GroupId] == NULL) {\r | |
191 | continue;\r | |
192 | }\r | |
193 | \r | |
194 | if (!EFI_ERROR (gBS->CheckEvent (Private->IgmpGroupEvent[GroupId]))) {\r | |
195 | //\r | |
196 | // send a report\r | |
197 | //\r | |
198 | ReportIgmp (Private, GroupId);\r | |
199 | }\r | |
200 | }\r | |
201 | }\r | |
202 | \r | |
203 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
204 | \r | |
205 | /**\r | |
206 | \r | |
207 | @return 0 := Group not found\r | |
208 | @return other := Group ID#\r | |
209 | \r | |
210 | **/\r | |
211 | STATIC\r | |
212 | INTN\r | |
213 | FindMulticastGroup (\r | |
214 | PXE_BASECODE_DEVICE *Private,\r | |
215 | UINT32 GroupAddress\r | |
216 | )\r | |
217 | {\r | |
218 | UINTN GroupId;\r | |
219 | \r | |
220 | for (GroupId = 0; GroupId < Private->MCastGroupCount; ++GroupId) {\r | |
221 | if (Private->MCastGroup[GroupId] == GroupAddress) {\r | |
222 | return GroupId + 1;\r | |
223 | }\r | |
224 | }\r | |
225 | \r | |
226 | return 0;\r | |
227 | }\r | |
228 | \r | |
229 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
230 | \r | |
231 | /**\r | |
232 | \r | |
233 | \r | |
234 | **/\r | |
235 | VOID\r | |
236 | IgmpJoinGroup (\r | |
237 | PXE_BASECODE_DEVICE *Private,\r | |
238 | EFI_IP_ADDRESS *GroupPtr\r | |
239 | )\r | |
240 | {\r | |
241 | UINT32 Grp;\r | |
242 | \r | |
243 | Grp = *(UINT32 *) GroupPtr;\r | |
244 | \r | |
245 | //\r | |
246 | // see if we already have it or if we can't take anymore\r | |
247 | //\r | |
248 | if (FindMulticastGroup (Private, Grp) || Private->MCastGroupCount == MAX_MCAST_GROUPS) {\r | |
249 | return ;\r | |
250 | }\r | |
251 | //\r | |
252 | // add the group\r | |
253 | //\r | |
254 | Private->MCastGroup[Private->MCastGroupCount] = Grp;\r | |
255 | \r | |
256 | ReportIgmp (Private, Private->MCastGroupCount);\r | |
257 | //\r | |
258 | // send a report\r | |
259 | // so it will get sent again per RFC 2236\r | |
260 | //\r | |
261 | SetGroupTimer (\r | |
262 | Private,\r | |
263 | Private->MCastGroupCount++,\r | |
264 | UNSOLICITED_REPORT_INTERVAL * 10\r | |
265 | );\r | |
266 | }\r | |
267 | \r | |
268 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
269 | \r | |
270 | /**\r | |
271 | \r | |
272 | \r | |
273 | **/\r | |
274 | VOID\r | |
275 | IgmpLeaveGroup (\r | |
276 | PXE_BASECODE_DEVICE *Private,\r | |
277 | EFI_IP_ADDRESS *GroupPtr\r | |
278 | )\r | |
279 | {\r | |
280 | UINT32 Grp;\r | |
281 | UINTN GroupId;\r | |
282 | \r | |
283 | Grp = *(UINT32 *) GroupPtr;\r | |
284 | \r | |
285 | //\r | |
286 | // if not in group, ignore\r | |
287 | //\r | |
288 | GroupId = FindMulticastGroup (Private, Grp);\r | |
289 | \r | |
290 | if (GroupId == 0) {\r | |
291 | return ;\r | |
292 | }\r | |
293 | //\r | |
294 | // if not v1 querrier, send leave group IGMP message\r | |
295 | //\r | |
296 | if (Private->Igmpv1TimeoutEvent != NULL) {\r | |
297 | if (!EFI_ERROR (gBS->CheckEvent (Private->Igmpv1TimeoutEvent))) {\r | |
298 | gBS->CloseEvent (Private->Igmpv1TimeoutEvent);\r | |
299 | Private->Igmpv1TimeoutEvent = NULL;\r | |
300 | Private->UseIgmpv1Reporting = TRUE;\r | |
301 | } else {\r | |
302 | SendIgmpMessage (Private, IGMP_TYPE_LEAVE_GROUP, GroupId - 1);\r | |
303 | }\r | |
304 | }\r | |
305 | \r | |
306 | while (GroupId < Private->MCastGroupCount) {\r | |
307 | Private->MCastGroup[GroupId - 1] = Private->MCastGroup[GroupId];\r | |
308 | Private->IgmpGroupEvent[GroupId - 1] = Private->IgmpGroupEvent[GroupId];\r | |
309 | ++GroupId;\r | |
310 | }\r | |
311 | \r | |
312 | --Private->MCastGroupCount;\r | |
313 | }\r | |
314 | \r | |
315 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
316 | \r | |
317 | /**\r | |
318 | \r | |
319 | \r | |
320 | **/\r | |
321 | VOID\r | |
322 | HandleIgmp (\r | |
323 | PXE_BASECODE_DEVICE *Private,\r | |
324 | IGMPV2_MESSAGE *IgmpMessagePtr,\r | |
325 | UINTN IgmpLength\r | |
326 | )\r | |
327 | {\r | |
328 | EFI_STATUS EfiStatus;\r | |
329 | UINTN GroupId;\r | |
330 | INTN MaxRespTime;\r | |
331 | \r | |
332 | if (Private == NULL) {\r | |
333 | return ;\r | |
334 | }\r | |
335 | \r | |
336 | if (Private->MCastGroupCount == 0) {\r | |
337 | //\r | |
338 | // if we don't belong to any multicast groups, ignore\r | |
339 | //\r | |
340 | return ;\r | |
341 | }\r | |
342 | //\r | |
343 | // verify checksum\r | |
344 | //\r | |
345 | if (IpChecksum ((UINT16 *) IgmpMessagePtr, IgmpLength)) {\r | |
346 | //\r | |
347 | // bad checksum - ignore packet\r | |
348 | //\r | |
349 | return ;\r | |
350 | }\r | |
351 | \r | |
352 | switch (IgmpMessagePtr->Type) {\r | |
353 | case IGMP_TYPE_QUERY:\r | |
354 | //\r | |
355 | // if a version 1 querier, note the fact and set max resp time\r | |
356 | //\r | |
357 | MaxRespTime = IgmpMessagePtr->MaxRespTime;\r | |
358 | \r | |
359 | if (MaxRespTime == 0) {\r | |
360 | Private->UseIgmpv1Reporting = TRUE;\r | |
361 | \r | |
362 | if (Private->Igmpv1TimeoutEvent != NULL) {\r | |
363 | gBS->CloseEvent (Private->Igmpv1TimeoutEvent);\r | |
364 | }\r | |
365 | \r | |
366 | EfiStatus = gBS->CreateEvent (\r | |
367 | EVT_TIMER,\r | |
368 | TPL_CALLBACK,\r | |
369 | NULL,\r | |
370 | NULL,\r | |
371 | &Private->Igmpv1TimeoutEvent\r | |
372 | );\r | |
373 | \r | |
374 | if (EFI_ERROR (EfiStatus)) {\r | |
375 | Private->Igmpv1TimeoutEvent = NULL;\r | |
376 | } else {\r | |
377 | EfiStatus = gBS->SetTimer (\r | |
378 | Private->Igmpv1TimeoutEvent,\r | |
379 | TimerRelative,\r | |
380 | (UINT64) V1ROUTER_PRESENT_TIMEOUT * 10000000\r | |
381 | );\r | |
382 | }\r | |
383 | \r | |
384 | MaxRespTime = IGMP_DEFAULT_MAX_RESPONSE_TIME * 10;\r | |
385 | }\r | |
386 | //\r | |
387 | // if a general query (!GroupAddress), set all our group timers\r | |
388 | //\r | |
389 | if (!IgmpMessagePtr->GroupAddress) {\r | |
390 | for (GroupId = 0; GroupId < Private->MCastGroupCount; ++GroupId) {\r | |
391 | SetGroupTimer (Private, GroupId, MaxRespTime);\r | |
392 | }\r | |
393 | } else {\r | |
394 | //\r | |
395 | // specific query - set only specific group\r | |
396 | //\r | |
397 | GroupId = FindMulticastGroup (Private, IgmpMessagePtr->GroupAddress);\r | |
398 | \r | |
399 | if (GroupId != 0) {\r | |
400 | SetGroupTimer (Private, GroupId - 1, MaxRespTime);\r | |
401 | }\r | |
402 | }\r | |
403 | \r | |
404 | break;\r | |
405 | \r | |
406 | //\r | |
407 | // if we have a timer running for this group, clear it\r | |
408 | //\r | |
409 | case IGMP_TYPE_V1REPORT:\r | |
410 | case IGMP_TYPE_REPORT:\r | |
411 | GroupId = FindMulticastGroup (Private, IgmpMessagePtr->GroupAddress);\r | |
412 | \r | |
413 | if (GroupId != 0) {\r | |
414 | ClearGroupTimer (Private, GroupId - 1);\r | |
415 | }\r | |
416 | \r | |
417 | break;\r | |
418 | }\r | |
419 | }\r | |
420 | \r | |
421 | /* EOF - pxe_bc_igmp.c */\r |