summaryrefslogtreecommitdiff
path: root/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Igmp.c
blob: 849a40d41318c54fdefd0f30cc27385b1253a60f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
/** @file
  This file implements the RFC2236: IGMP v2.
  
Copyright (c) 2005 - 2009, Intel Corporation.<BR>
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "Ip4Impl.h"

//
// Route Alert option in IGMP report to direct routers to
// examine the packet more closely.
//
UINT32  mRouteAlertOption = 0x00000494;


/**
  Init the IGMP control data of the IP4 service instance, configure
  MNP to receive ALL SYSTEM multicast.

  @param[in, out]  IpSb          The IP4 service whose IGMP is to be initialized.

  @retval EFI_SUCCESS            IGMP of the IpSb is successfully initialized.
  @retval EFI_OUT_OF_RESOURCES   Failed to allocate resource to initialize IGMP.
  @retval Others                 Failed to initialize the IGMP of IpSb.

**/
EFI_STATUS
Ip4InitIgmp (
  IN OUT IP4_SERVICE            *IpSb
  )
{
  IGMP_SERVICE_DATA             *IgmpCtrl;
  EFI_MANAGED_NETWORK_PROTOCOL  *Mnp;
  IGMP_GROUP                    *Group;
  EFI_STATUS                    Status;

  IgmpCtrl = &IpSb->IgmpCtrl;

  //
  // Configure MNP to receive ALL_SYSTEM multicast
  //
  Group    = AllocatePool (sizeof (IGMP_GROUP));

  if (Group == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Mnp               = IpSb->Mnp;

  Group->Address    = IP4_ALLSYSTEM_ADDRESS;
  Group->RefCnt     = 1;
  Group->DelayTime  = 0;
  Group->ReportByUs = FALSE;

  Status = Ip4GetMulticastMac (Mnp, IP4_ALLSYSTEM_ADDRESS, &Group->Mac);

  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  Status = Mnp->Groups (Mnp, TRUE, &Group->Mac);

  if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
    goto ON_ERROR;
  }

  InsertHeadList (&IgmpCtrl->Groups, &Group->Link);
  return EFI_SUCCESS;

ON_ERROR:
  FreePool (Group);
  return Status;
}


/**
  Find the IGMP_GROUP structure which contains the status of multicast
  group Address in this IGMP control block

  @param[in]  IgmpCtrl               The IGMP control block to search from
  @param[in]  Address                The multicast address to search

  @return NULL if the multicast address isn't in the IGMP control block. Otherwise
          the point to the IGMP_GROUP which contains the status of multicast group
          for Address.

**/
IGMP_GROUP *
Ip4FindGroup (
  IN IGMP_SERVICE_DATA      *IgmpCtrl,
  IN IP4_ADDR               Address
  )
{
  LIST_ENTRY                *Entry;
  IGMP_GROUP                *Group;

  NET_LIST_FOR_EACH (Entry, &IgmpCtrl->Groups) {
    Group = NET_LIST_USER_STRUCT (Entry, IGMP_GROUP, Link);

    if (Group->Address == Address) {
      return Group;
    }
  }

  return NULL;
}


/**
  Count the number of IP4 multicast groups that are mapped to the
  same MAC address. Several IP4 multicast address may be mapped to
  the same MAC address.

  @param[in]  IgmpCtrl               The IGMP control block to search in
  @param[in]  Mac                    The MAC address to search

  @return The number of the IP4 multicast group that mapped to the same
          multicast group Mac.

**/
INTN
Ip4FindMac (
  IN IGMP_SERVICE_DATA      *IgmpCtrl,
  IN EFI_MAC_ADDRESS        *Mac
  )
{
  LIST_ENTRY                *Entry;
  IGMP_GROUP                *Group;
  INTN                      Count;

  Count = 0;

  NET_LIST_FOR_EACH (Entry, &IgmpCtrl->Groups) {
    Group = NET_LIST_USER_STRUCT (Entry, IGMP_GROUP, Link);

    if (NET_MAC_EQUAL (&Group->Mac, Mac, sizeof (EFI_MAC_ADDRESS))) {
      Count++;
    }
  }

  return Count;
}


/**
  Send an IGMP protocol message to the Dst, such as IGMP v1 membership report.

  @param[in]  IpSb               The IP4 service instance that requests the
                                 transmission
  @param[in]  Dst                The destinaton to send to
  @param[in]  Type               The IGMP message type, such as IGMP v1 membership
                                 report
  @param[in]  Group              The group address in the IGMP message head.

  @retval EFI_OUT_OF_RESOURCES   Failed to allocate memory to build the message
  @retval EFI_SUCCESS            The IGMP message is successfully send
  @retval Others                 Failed to send the IGMP message.

**/
EFI_STATUS
Ip4SendIgmpMessage (
  IN IP4_SERVICE            *IpSb,
  IN IP4_ADDR               Dst,
  IN UINT8                  Type,
  IN IP4_ADDR               Group
  )
{
  IP4_HEAD                  Head;
  NET_BUF                   *Packet;
  IGMP_HEAD                 *Igmp;

  //
  // Allocate a net buffer to hold the message
  //
  Packet = NetbufAlloc (IP4_MAX_HEADLEN + sizeof (IGMP_HEAD));

  if (Packet == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  //
  // Fill in the IGMP and IP header, then transmit the message
  //
  NetbufReserve (Packet, IP4_MAX_HEADLEN);

  Igmp = (IGMP_HEAD *) NetbufAllocSpace (Packet, sizeof (IGMP_HEAD), FALSE);
  if (Igmp == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Igmp->Type        = Type;
  Igmp->MaxRespTime = 0;
  Igmp->Checksum    = 0;
  Igmp->Group       = HTONL (Group);
  Igmp->Checksum    = (UINT16) (~NetblockChecksum ((UINT8 *) Igmp, sizeof (IGMP_HEAD)));

  Head.Tos          = 0;
  Head.Protocol     = IP4_PROTO_IGMP;
  Head.Ttl          = 1;
  Head.Fragment     = 0;
  Head.Dst          = Dst;
  Head.Src          = IP4_ALLZERO_ADDRESS;

  return Ip4Output (
           IpSb,
           NULL,
           Packet,
           &Head,
           (UINT8 *) &mRouteAlertOption,
           sizeof (UINT32),
           IP4_ALLZERO_ADDRESS,
           Ip4SysPacketSent,
           NULL
           );
}


/**
  Send an IGMP membership report. Depends on whether the server is
  v1 or v2, it will send either a V1 or V2 membership report.

  @param[in]  IpSb               The IP4 service instance that requests the
                                 transmission.
  @param[in]  Group              The group address to report

  @retval EFI_OUT_OF_RESOURCES   Failed to allocate memory to build the message
  @retval EFI_SUCCESS            The IGMP report message is successfully send
  @retval Others                 Failed to send the report.

**/
EFI_STATUS
Ip4SendIgmpReport (
  IN IP4_SERVICE            *IpSb,
  IN IP4_ADDR               Group
  )
{
  if (IpSb->IgmpCtrl.Igmpv1QuerySeen != 0) {
    return Ip4SendIgmpMessage (IpSb, Group, IGMP_V1_MEMBERSHIP_REPORT, Group);
  } else {
    return Ip4SendIgmpMessage (IpSb, Group, IGMP_V2_MEMBERSHIP_REPORT, Group);
  }
}


/**
  Join the multicast group on behalf of this IP4 child

  @param[in]  IpInstance         The IP4 child that wants to join the group
  @param[in]  Address            The group to join

  @retval EFI_SUCCESS            Successfully join the multicast group
  @retval EFI_OUT_OF_RESOURCES   Failed to allocate resources
  @retval Others                 Failed to join the multicast group.

**/
EFI_STATUS
Ip4JoinGroup (
  IN IP4_PROTOCOL           *IpInstance,
  IN IP4_ADDR               Address
  )
{
  EFI_MANAGED_NETWORK_PROTOCOL  *Mnp;
  IP4_SERVICE                   *IpSb;
  IGMP_SERVICE_DATA             *IgmpCtrl;
  IGMP_GROUP                    *Group;
  EFI_STATUS                    Status;

  IpSb      = IpInstance->Service;
  IgmpCtrl  = &IpSb->IgmpCtrl;
  Mnp       = IpSb->Mnp;

  //
  // If the IP service already is a member in the group, just
  // increase the refernce count and return.
  //
  Group     = Ip4FindGroup (IgmpCtrl, Address);

  if (Group != NULL) {
    Group->RefCnt++;
    return EFI_SUCCESS;
  }

  //
  // Otherwise, create a new IGMP_GROUP,  Get the multicast's MAC address,
  // send a report, then direct MNP to receive the multicast.
  //
  Group = AllocatePool (sizeof (IGMP_GROUP));

  if (Group == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Group->Address    = Address;
  Group->RefCnt     = 1;
  Group->DelayTime  = IGMP_UNSOLICIATED_REPORT;
  Group->ReportByUs = TRUE;

  Status = Ip4GetMulticastMac (Mnp, Address, &Group->Mac);

  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  Status = Ip4SendIgmpReport (IpSb, Address);

  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  Status = Mnp->Groups (Mnp, TRUE, &Group->Mac);

  if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
    goto ON_ERROR;
  }

  InsertHeadList (&IgmpCtrl->Groups, &Group->Link);
  return EFI_SUCCESS;

ON_ERROR:
  FreePool (Group);
  return Status;
}


/**
  Leave the IP4 multicast group on behalf of IpInstance.

  @param[in]  IpInstance         The IP4 child that wants to leave the group
                                 address
  @param[in]  Address            The group address to leave

  @retval EFI_NOT_FOUND          The IP4 service instance isn't in the group
  @retval EFI_SUCCESS            Successfully leave the multicast group.
  @retval Others                 Failed to leave the multicast group.

**/
EFI_STATUS
Ip4LeaveGroup (
  IN IP4_PROTOCOL           *IpInstance,
  IN IP4_ADDR               Address
  )
{
  EFI_MANAGED_NETWORK_PROTOCOL  *Mnp;
  IP4_SERVICE                   *IpSb;
  IGMP_SERVICE_DATA             *IgmpCtrl;
  IGMP_GROUP                    *Group;
  EFI_STATUS                    Status;

  IpSb      = IpInstance->Service;
  IgmpCtrl  = &IpSb->IgmpCtrl;
  Mnp       = IpSb->Mnp;

  Group     = Ip4FindGroup (IgmpCtrl, Address);

  if (Group == NULL) {
    return EFI_NOT_FOUND;
  }

  //
  // If more than one instance is in the group, decrease
  // the RefCnt then return.
  //
  if (--Group->RefCnt > 0) {
    return EFI_SUCCESS;
  }

  //
  // If multiple IP4 group addresses are mapped to the same
  // multicast MAC address, don't configure the MNP to leave
  // the MAC.
  //
  if (Ip4FindMac (IgmpCtrl, &Group->Mac) == 1) {
    Status = Mnp->Groups (Mnp, FALSE, &Group->Mac);

    if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) {
      return Status;
    }
  }

  //
  // Send a leave report if the membership is reported by us
  // and we are talking IGMPv2.
  //
  if (Group->ReportByUs && IgmpCtrl->Igmpv1QuerySeen == 0) {
    Ip4SendIgmpMessage (IpSb, IP4_ALLROUTER_ADDRESS, IGMP_LEAVE_GROUP, Group->Address);
  }

  RemoveEntryList (&Group->Link);
  FreePool (Group);

  return EFI_SUCCESS;
}


/**
  Handle the received IGMP message for the IP4 service instance.

  @param[in]  IpSb               The IP4 service instance that received the message
  @param[in]  Head               The IP4 header of the received message
  @param[in]  Packet             The IGMP message, without IP4 header

  @retval EFI_INVALID_PARAMETER  The IGMP message is malformated.
  @retval EFI_SUCCESS            The IGMP message is successfully processed.

**/
EFI_STATUS
Ip4IgmpHandle (
  IN IP4_SERVICE            *IpSb,
  IN IP4_HEAD               *Head,
  IN NET_BUF                *Packet
  )
{
  IGMP_SERVICE_DATA         *IgmpCtrl;
  IGMP_HEAD                 Igmp;
  IGMP_GROUP                *Group;
  IP4_ADDR                  Address;
  LIST_ENTRY                *Entry;

  IgmpCtrl = &IpSb->IgmpCtrl;

  //
  // Must checksum over the whole packet, later IGMP version
  // may employ message longer than 8 bytes. IP's header has
  // already been trimmed off.
  //
  if ((Packet->TotalSize < sizeof (Igmp)) || (NetbufChecksum (Packet) != 0)) {
    NetbufFree (Packet);
    return EFI_INVALID_PARAMETER;
  }

  //
  // Copy the packet in case it is fragmented
  //
  NetbufCopy (Packet, 0, sizeof (IGMP_HEAD), (UINT8 *)&Igmp);

  switch (Igmp.Type) {
  case IGMP_MEMBERSHIP_QUERY:
    //
    // If MaxRespTime is zero, it is most likely that we are
    // talking to a V1 router
    //
    if (Igmp.MaxRespTime == 0) {
      IgmpCtrl->Igmpv1QuerySeen = IGMP_V1ROUTER_PRESENT;
      Igmp.MaxRespTime          = 100;
    }

    //
    // Igmp is ticking once per second but MaxRespTime is in
    // the unit of 100ms.
    //
    Igmp.MaxRespTime /= 10;
    Address = NTOHL (Igmp.Group);

    if (Address == IP4_ALLSYSTEM_ADDRESS) {
      break;
    }

    NET_LIST_FOR_EACH (Entry, &IgmpCtrl->Groups) {
      Group = NET_LIST_USER_STRUCT (Entry, IGMP_GROUP, Link);

      //
      // If address is all zero, all the memberships will be reported.
      // otherwise only one is reported.
      //
      if ((Address == IP4_ALLZERO_ADDRESS) || (Address == Group->Address)) {
        //
        // If the timer is pending, only update it if the time left
        // is longer than the MaxRespTime. TODO: randomize the DelayTime.
        //
        if ((Group->DelayTime == 0) || (Group->DelayTime > Igmp.MaxRespTime)) {
          Group->DelayTime = MAX (1, Igmp.MaxRespTime);
        }
      }
    }

    break;

  case IGMP_V1_MEMBERSHIP_REPORT:
  case IGMP_V2_MEMBERSHIP_REPORT:
    Address = NTOHL (Igmp.Group);
    Group   = Ip4FindGroup (IgmpCtrl, Address);

    if ((Group != NULL) && (Group->DelayTime > 0)) {
      Group->DelayTime  = 0;
      Group->ReportByUs = FALSE;
    }

    break;
  }

  NetbufFree (Packet);
  return EFI_SUCCESS;
}


/**
  The periodical timer function for IGMP. It does the following
  things:
  1. Decrease the Igmpv1QuerySeen to make it possible to refresh
     the IGMP server type.
  2. Decrease the report timer for each IGMP group in "delaying
     member" state.

  @param[in]  IpSb                   The IP4 service instance that is ticking

**/
VOID
Ip4IgmpTicking (
  IN IP4_SERVICE            *IpSb
  )
{
  IGMP_SERVICE_DATA         *IgmpCtrl;
  LIST_ENTRY                *Entry;
  IGMP_GROUP                *Group;

  IgmpCtrl = &IpSb->IgmpCtrl;

  if (IgmpCtrl->Igmpv1QuerySeen > 0) {
    IgmpCtrl->Igmpv1QuerySeen--;
  }

  //
  // Decrease the report timer for each IGMP group in "delaying member"
  //
  NET_LIST_FOR_EACH (Entry, &IgmpCtrl->Groups) {
    Group = NET_LIST_USER_STRUCT (Entry, IGMP_GROUP, Link);
    ASSERT (Group->DelayTime >= 0);

    if (Group->DelayTime > 0) {
      Group->DelayTime--;

      if (Group->DelayTime == 0) {
        Ip4SendIgmpReport (IpSb, Group->Address);
        Group->ReportByUs = TRUE;
      }
    }
  }
}


/**
  Add a group address to the array of group addresses.
  The caller should make sure that no duplicated address
  existed in the array. Although the function doesn't
  assume the byte order of the both Source and Addr, the
  network byte order is used by the caller.

  @param[in]  Source                 The array of group addresses to add to
  @param[in]  Count                  The number of group addresses in the Source
  @param[in]  Addr                   The IP4 multicast address to add

  @return NULL if failed to allocate memory for the new groups,
          otherwise the new combined group addresses.

**/
IP4_ADDR *
Ip4CombineGroups (
  IN  IP4_ADDR              *Source,
  IN  UINT32                Count,
  IN  IP4_ADDR              Addr
  )
{
  IP4_ADDR                  *Groups;

  Groups = AllocatePool (sizeof (IP4_ADDR) * (Count + 1));

  if (Groups == NULL) {
    return NULL;
  }

  CopyMem (Groups, Source, Count * sizeof (IP4_ADDR));
  Groups[Count] = Addr;

  return Groups;
}


/**
  Remove a group address from the array of group addresses.
  Although the function doesn't assume the byte order of the
  both Groups and Addr, the network byte order is used by
  the caller.

  @param  Groups            The array of group addresses to remove from
  @param  Count             The number of group addresses in the Groups
  @param  Addr              The IP4 multicast address to remove

  @return The nubmer of group addresses in the Groups after remove.
          It is Count if the Addr isn't in the Groups.

**/
INTN
Ip4RemoveGroupAddr (
  IN OUT IP4_ADDR               *Groups,
  IN     UINT32                 Count,
  IN     IP4_ADDR               Addr
  )
{
  UINT32                    Index;

  for (Index = 0; Index < Count; Index++) {
    if (Groups[Index] == Addr) {
      break;
    }
  }

  while (Index < Count - 1) {
    Groups[Index] = Groups[Index + 1];
    Index++;
  }

  return Index;
}