summaryrefslogtreecommitdiff
path: root/src/ats/ats_api_scheduling.c
blob: 8d2cdc84e11a1499010c4d82633d87835d89c4c5 (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
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
/*
     This file is part of GNUnet.
     (C) 2010-2015 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/
/**
 * @file ats/ats_api_scheduling.c
 * @brief automatic transport selection and outbound bandwidth determination
 * @author Christian Grothoff
 * @author Matthias Wachs
 *
 * TODO:
 * - we could avoid a linear scan over the
 *   active addresses in some cases, so if
 *   there is need, we can still optimize here
 * - we might want to split off the logic to
 *   determine LAN vs. WAN, as it has nothing
 *   to do with accessing the ATS service.
 */
#include "platform.h"
#include "gnunet_ats_service.h"
#include "ats.h"

/**
 * How frequently do we scan the interfaces for changes to the addresses?
 */
#define INTERFACE_PROCESSING_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)


/**
 * Session ID we use if there is no session / slot.
 */
#define NOT_FOUND 0


/**
 * Information we track per address, incoming or outgoing.  It also
 * doesn't matter if we have a session, any address that ATS is
 * allowed to suggest right now should be tracked.
 */
struct GNUNET_ATS_AddressRecord
{

  /**
   * Scheduling handle this address record belongs to.
   */
  struct GNUNET_ATS_SchedulingHandle *sh;

  /**
   * Address data.
   */
  struct GNUNET_HELLO_Address *address;

  /**
   * Session handle.  NULL if we have an address but no
   * active session for this address.
   */
  struct Session *session;

  /**
   * Array with performance data about the address.
   */
  struct GNUNET_ATS_Information *ats;

  /**
   * Number of entries in @e ats.
   */
  uint32_t ats_count;

  /**
   * Which slot (index) in the session array does
   * this record correspond to?  FIXME:
   * FIXME: a linear search on this is really crappy!
   * Maybe switch to a 64-bit global counter and be
   * done with it?  Or does that then cause too much
   * trouble on the ATS-service side?
   */
  uint32_t slot;

  /**
   * Is this address currently in use?  In use means
   * that the transport service will use this address
   * for sending.
   */
  int in_use;

  /**
   * We're about to destroy this address record, just ATS does
   * not know this yet.  Once ATS confirms its destruction,
   * we can clean up.
   */
  int in_destroy;
};


/**
 * We keep a list of our local networks so we can answer
 * LAN vs. WAN questions.  Note: WLAN is not detected yet.
 * (maybe we can do that heuristically based on interface
 * name in the future?).
 *
 * FIXME: should this be part of the ATS scheduling API?
 * Seems to be more generic and independent of ATS.
 */
struct ATS_Network
{
  /**
   * Kept in a DLL.
   */
  struct ATS_Network *next;

  /**
   * Kept in a DLL.
   */
  struct ATS_Network *prev;

  /**
   * Network address.
   */
  struct sockaddr *network;

  /**
   * Netmask to determine what is in the LAN.
   */
  struct sockaddr *netmask;

  /**
   * How long are @e network and @e netmask?
   */
  socklen_t length;
};


/**
 * Handle for ATS address suggestion requests.
 */
struct GNUNET_ATS_SuggestHandle
{
  /**
   * ID of the peer for which address suggestion was requested.
   */
  struct GNUNET_PeerIdentity id;
};


/**
 * Handle to the ATS subsystem for bandwidth/transport scheduling information.
 */
struct GNUNET_ATS_SchedulingHandle
{

  /**
   * Our configuration.
   */
  const struct GNUNET_CONFIGURATION_Handle *cfg;

  /**
   * Callback to invoke on suggestions.
   */
  GNUNET_ATS_AddressSuggestionCallback suggest_cb;

  /**
   * Closure for @e suggest_cb.
   */
  void *suggest_cb_cls;

  /**
   * Map with the identities of all the peers for which we would
   * like to have address suggestions.  The key is the PID, the
   * value is currently the `struct GNUNET_ATS_SuggestHandle`
   */
  struct GNUNET_CONTAINER_MultiPeerMap *sug_requests;

  /**
   * Connection to ATS service.
   */
  struct GNUNET_CLIENT_Connection *client;

  /**
   * Message queue for sending requests to the ATS service.
   */
  struct GNUNET_MQ_Handle *mq;

  /**
   * Head of LAN networks list.
   */
  struct ATS_Network *net_head;

  /**
   * Tail of LAN networks list.
   */
  struct ATS_Network *net_tail;

  /**
   * Array of session objects (we need to translate them to numbers and back
   * for the protocol; the offset in the array is the session number on the
   * network).  Index 0 is always NULL and reserved to represent the NULL pointer.
   * Unused entries are also NULL.
   */
  struct GNUNET_ATS_AddressRecord **session_array;

  /**
   * Task to trigger reconnect.
   */
  struct GNUNET_SCHEDULER_Task *task;

  /**
   * Task for periodically refreshing our LAN network list.
   */
  struct GNUNET_SCHEDULER_Task *interface_task;

  /**
   * Size of the @e session_array.
   */
  unsigned int session_array_size;

};


/**
 * Re-establish the connection to the ATS service.
 *
 * @param sh handle to use to re-connect.
 */
static void
reconnect (struct GNUNET_ATS_SchedulingHandle *sh);


/**
 * Re-establish the connection to the ATS service.
 *
 * @param cls handle to use to re-connect.
 * @param tc scheduler context
 */
static void
reconnect_task (void *cls,
                const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GNUNET_ATS_SchedulingHandle *sh = cls;

  sh->task = NULL;
  reconnect (sh);
}


/**
 * Disconnect from ATS and then reconnect.
 *
 * @param sh our handle
 */
static void
force_reconnect (struct GNUNET_ATS_SchedulingHandle *sh)
{
  if (NULL != sh->mq)
  {
    GNUNET_MQ_destroy (sh->mq);
    sh->mq = NULL;
  }
  if (NULL != sh->client)
  {
    GNUNET_CLIENT_disconnect (sh->client);
    sh->client = NULL;
  }
  sh->task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
                                           &reconnect_task,
                                           sh);
}


/**
 * Find the session object corresponding to the given session ID.
 *
 * @param sh our handle
 * @param session_id current session ID
 * @param peer peer the session belongs to
 * @return the session object (or NULL)
 */
static struct GNUNET_ATS_AddressRecord *
find_session (struct GNUNET_ATS_SchedulingHandle *sh,
              uint32_t session_id,
              const struct GNUNET_PeerIdentity *peer)
{
  struct GNUNET_ATS_AddressRecord *ar;

  if (session_id >= sh->session_array_size)
  {
    GNUNET_break (0);
    return NULL;
  }
  if (0 == session_id)
    return NULL;
  ar = sh->session_array[session_id];
  if (NULL == ar)
  {
    GNUNET_break (0);
    return NULL;
  }
  if (NULL == ar->address)
  {
    /* address was destroyed in the meantime, this can happen
       as we communicate asynchronously with the ATS service. */
    return NULL;
  }
  if (0 != memcmp (peer,
                   &ar->address->peer,
                   sizeof (struct GNUNET_PeerIdentity)))
  {
    GNUNET_break (0);
    force_reconnect (sh);
    return NULL;
  }
  return ar;
}


/**
 * Get an available session ID.
 *
 * @param sh our handle
 * @return an unused slot, but never NOT_FOUND (0)
 */
static uint32_t
find_empty_session_slot (struct GNUNET_ATS_SchedulingHandle *sh)
{
  static uint32_t off;
  uint32_t i;

  i = 0;
  while ( ( (NOT_FOUND == off) ||
            (NULL != sh->session_array[off % sh->session_array_size]) ) &&
          (i < sh->session_array_size) )
  {
    off++;
    i++;
  }
  if ( (NOT_FOUND != off % sh->session_array_size) &&
       (NULL == sh->session_array[off % sh->session_array_size]) )
    return off;
  i = sh->session_array_size;
  GNUNET_array_grow (sh->session_array,
                     sh->session_array_size,
                     sh->session_array_size * 2);
  return i;
}


/**
 * Get the ID for the given session object.
 *
 * @param sh our handle
 * @param session session object
 * @param address the address we are looking for
 * @return the session id or NOT_FOUND for error
 */
static uint32_t
find_session_id (struct GNUNET_ATS_SchedulingHandle *sh,
                 struct Session *session,
                 const struct GNUNET_HELLO_Address *address)
{
  uint32_t i;

  if (NULL == address)
  {
    GNUNET_break (0);
    return NOT_FOUND;
  }
  for (i = 1; i < sh->session_array_size; i++)
    if ( (NULL != sh->session_array[i]) &&
         ( (session == sh->session_array[i]->session) ||
           (NULL == sh->session_array[i]->session) ) &&
         (0 == GNUNET_HELLO_address_cmp (address,
                                         sh->session_array[i]->address)) )
      return i;
  return NOT_FOUND;
}


/**
 * Release the session slot from the session table (ATS service is
 * also done using it).
 *
 * @param sh our handle
 * @param session_id identifies session that is no longer valid
 */
static void
release_session (struct GNUNET_ATS_SchedulingHandle *sh,
                 uint32_t session_id)
{
  struct GNUNET_ATS_AddressRecord *ar;

  if (NOT_FOUND == session_id)
    return;
  if (session_id >= sh->session_array_size)
  {
    GNUNET_break (0);
    force_reconnect (sh);
    return;
  }
  /* this slot should have been removed from remove_session before */
  ar = sh->session_array[session_id];
  if (NULL != ar->session)
  {
    GNUNET_break (0);
    force_reconnect (sh);
    return;
  }
  GNUNET_HELLO_address_free (ar->address);
  GNUNET_free (ar);
  sh->session_array[session_id] = NULL;
}


/**
 * Type of a function to call when we receive a session release
 * message from the service.
 *
 * @param cls the `struct GNUNET_ATS_SchedulingHandle`
 * @param msg message received, NULL on timeout or fatal error
 */
static void
process_ats_session_release_message (void *cls,
                                     const struct GNUNET_MessageHeader *msg)
{
  struct GNUNET_ATS_SchedulingHandle *sh = cls;
  const struct SessionReleaseMessage *srm;

  srm = (const struct SessionReleaseMessage *) msg;
  /* Note: peer field in srm not necessary right now,
     but might be good to have in the future */
  release_session (sh,
                   ntohl (srm->session_id));
}


/**
 * Type of a function to call when we receive a address suggestion
 * message from the service.
 *
 * @param cls the `struct GNUNET_ATS_SchedulingHandle`
 * @param msg message received, NULL on timeout or fatal error
 */
static void
process_ats_address_suggestion_message (void *cls,
                                        const struct GNUNET_MessageHeader *msg)
{
  struct GNUNET_ATS_SchedulingHandle *sh = cls;
  const struct AddressSuggestionMessage *m;
  struct GNUNET_ATS_AddressRecord *ar;
  uint32_t session_id;

  m = (const struct AddressSuggestionMessage *) msg;
  session_id = ntohl (m->session_id);
  if (0 == session_id)
  {
    GNUNET_break (0);
    force_reconnect (sh);
    return;
  }
  ar = find_session (sh, session_id, &m->peer);
  if (NULL == ar)
  {
    GNUNET_break (0);
    force_reconnect (sh);
    return;
  }
  if (NULL == sh->suggest_cb)
    return;
  if (GNUNET_YES == ar->in_destroy)
  {
    /* ignore suggestion, as this address is dying */
    return;
  }
  if ( (NULL == ar->session) &&
       (GNUNET_HELLO_address_check_option (ar->address,
                                           GNUNET_HELLO_ADDRESS_INFO_INBOUND)) )
  {
    GNUNET_assert (0);
    return;
  }
  sh->suggest_cb (sh->suggest_cb_cls,
                  &m->peer,
                  ar->address,
                  ar->session,
                  m->bandwidth_out,
                  m->bandwidth_in);
}


/**
 * We encountered an error handling the MQ to the
 * ATS service.  Reconnect.
 *
 * @param cls the `struct GNUNET_ATS_SchedulingHandle`
 * @param error details about the error
 */
static void
error_handler (void *cls,
               enum GNUNET_MQ_Error error)
{
  struct GNUNET_ATS_SchedulingHandle *sh = cls;

  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
              "ATS connection died (code %d), reconnecting\n",
              (int) error);
  force_reconnect (sh);
}


/**
 * Generate and transmit the `struct AddressAddMessage` for the given
 * address record.
 *
 * @param sh the scheduling handle to use for transmission
 * @param ar the address to inform the ATS service about
 */
static void
send_add_address_message (struct GNUNET_ATS_SchedulingHandle *sh,
                          const struct GNUNET_ATS_AddressRecord *ar)
{
  struct GNUNET_MQ_Envelope *ev;
  struct AddressAddMessage *m;
  struct GNUNET_ATS_Information *am;
  char *pm;
  size_t namelen;
  size_t msize;

  if (NULL == sh->mq)
    return; /* disconnected, skip for now */
  namelen = (NULL == ar->address->transport_name)
    ? 0
    : strlen (ar->address->transport_name) + 1;
  msize = ar->address->address_length +
    ar->ats_count * sizeof (struct GNUNET_ATS_Information) + namelen;

  ev = GNUNET_MQ_msg_extra (m, msize, GNUNET_MESSAGE_TYPE_ATS_ADDRESS_ADD);
  m->ats_count = htonl (ar->ats_count);
  m->peer = ar->address->peer;
  m->address_length = htons (ar->address->address_length);
  m->address_local_info = htonl ((uint32_t) ar->address->local_info);
  m->plugin_name_length = htons (namelen);
  m->session_id = htonl (ar->slot);

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Adding address for peer `%s', plugin `%s', session %p id %u\n",
              GNUNET_i2s (&ar->address->peer),
              ar->address->transport_name,
              ar->session,
              ar->slot);
  am = (struct GNUNET_ATS_Information *) &m[1];
  memcpy (am,
          ar->ats,
          ar->ats_count * sizeof (struct GNUNET_ATS_Information));
  pm = (char *) &am[ar->ats_count];
  memcpy (pm,
          ar->address->address,
          ar->address->address_length);
  if (NULL != ar->address->transport_name)
    memcpy (&pm[ar->address->address_length],
            ar->address->transport_name,
            namelen);
  GNUNET_MQ_send (sh->mq, ev);
}


/**
 * Transmit request for an address suggestion.
 *
 * @param cls the `struct GNUNET_ATS_SchedulingHandle`
 * @param peer peer to ask for an address suggestion for
 * @param value the `struct GNUNET_ATS_SuggestHandle`
 * @return #GNUNET_OK (continue to iterate), #GNUNET_SYSERR on
 *         failure (message queue no longer exists)
 */
static int
transmit_suggestion (void *cls,
                     const struct GNUNET_PeerIdentity *peer,
                     void *value)
{
  struct GNUNET_ATS_SchedulingHandle *sh = cls;
  struct GNUNET_MQ_Envelope *ev;
  struct RequestAddressMessage *m;

  if (NULL == sh->mq)
    return GNUNET_SYSERR;
  ev = GNUNET_MQ_msg (m, GNUNET_MESSAGE_TYPE_ATS_REQUEST_ADDRESS);
  m->reserved = htonl (0);
  m->peer = *peer;
  GNUNET_MQ_send (sh->mq, ev);
  return GNUNET_OK;
}


/**
 * Generate and transmit the `struct AddressUseMessage` for the given
 * address record.
 *
 * @param ar the address to inform the ATS service about
 * @param in_use say if it is in use or not
 */
static void
send_in_use_message (struct GNUNET_ATS_AddressRecord *ar,
                     int in_use)
{
  struct GNUNET_ATS_SchedulingHandle *sh = ar->sh;
  struct GNUNET_MQ_Envelope *ev;
  struct AddressUseMessage *m;

  ev = GNUNET_MQ_msg (m, GNUNET_MESSAGE_TYPE_ATS_ADDRESS_IN_USE);
  m->peer = ar->address->peer;
  m->in_use = htonl ((uint32_t) in_use);
  m->session_id = htonl (ar->slot);
  GNUNET_MQ_send (sh->mq, ev);
}


/**
 * Re-establish the connection to the ATS service.
 *
 * @param sh handle to use to re-connect.
 */
static void
reconnect (struct GNUNET_ATS_SchedulingHandle *sh)
{
  static const struct GNUNET_MQ_MessageHandler handlers[] =
    { { &process_ats_session_release_message,
        GNUNET_MESSAGE_TYPE_ATS_SESSION_RELEASE,
        sizeof (struct SessionReleaseMessage) },
      { &process_ats_address_suggestion_message,
        GNUNET_MESSAGE_TYPE_ATS_ADDRESS_SUGGESTION,
        sizeof (struct AddressSuggestionMessage) },
      { NULL, 0, 0 } };
  struct GNUNET_MQ_Envelope *ev;
  struct ClientStartMessage *init;
  unsigned int i;
  struct GNUNET_ATS_AddressRecord *ar;

  GNUNET_assert (NULL == sh->client);
  sh->client = GNUNET_CLIENT_connect ("ats", sh->cfg);
  if (NULL == sh->client)
  {
    force_reconnect (sh);
    return;
  }
  sh->mq = GNUNET_MQ_queue_for_connection_client (sh->client,
                                                  handlers,
                                                  &error_handler,
                                                  sh);
  ev = GNUNET_MQ_msg (init,
                      GNUNET_MESSAGE_TYPE_ATS_START);
  init->start_flag = htonl (START_FLAG_SCHEDULING);
  GNUNET_MQ_send (sh->mq, ev);
  if (NULL == sh->mq)
    return;
  for (i=0;i<sh->session_array_size;i++)
  {
    ar = sh->session_array[i];
    if (NULL == ar)
      continue;
    send_add_address_message (sh, ar);
    if (ar->in_use)
      send_in_use_message (ar, GNUNET_YES);
    if (NULL == sh->mq)
      return;
  }
  GNUNET_CONTAINER_multipeermap_iterate (sh->sug_requests,
                                         &transmit_suggestion,
                                         sh);
}


/**
 * Delete all entries from the current network list.
 *
 * @param sh scheduling handle to clean up
 */
static void
delete_networks (struct GNUNET_ATS_SchedulingHandle *sh)
{
  struct ATS_Network *cur;

  while (NULL != (cur = sh->net_head))
  {
    GNUNET_CONTAINER_DLL_remove (sh->net_head,
                                 sh->net_tail,
                                 cur);
    GNUNET_free (cur);
  }
}


/**
 * Function invoked for each interface found.  Adds the interface's
 * network addresses to the respective DLL, so we can distinguish
 * between LAN and WAN.
 *
 * @param cls closure
 * @param name name of the interface (can be NULL for unknown)
 * @param isDefault is this presumably the default interface
 * @param addr address of this interface (can be NULL for unknown or unassigned)
 * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
 * @param netmask the network mask (can be NULL for unknown or unassigned)
 * @param addrlen length of the address
 * @return #GNUNET_OK to continue iteration
 */
static int
interface_proc (void *cls,
                const char *name,
                int isDefault,
                const struct sockaddr *addr,
                const struct sockaddr *broadcast_addr,
                const struct sockaddr *netmask,
                socklen_t addrlen)
{
  struct GNUNET_ATS_SchedulingHandle *sh = cls;
  /* Calculate network */
  struct ATS_Network *net = NULL;

  /* Skipping IPv4 loopback addresses since we have special check  */
  if  (addr->sa_family == AF_INET)
  {
    const struct sockaddr_in *a4 = (const struct sockaddr_in *) addr;

    if ((a4->sin_addr.s_addr & htonl(0xff000000)) == htonl (0x7f000000))
       return GNUNET_OK;
  }
  /* Skipping IPv6 loopback addresses since we have special check  */
  if  (addr->sa_family == AF_INET6)
  {
    const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) addr;
    if (IN6_IS_ADDR_LOOPBACK (&a6->sin6_addr))
      return GNUNET_OK;
  }

  if (addr->sa_family == AF_INET)
  {
    const struct sockaddr_in *addr4 = (const struct sockaddr_in *) addr;
    const struct sockaddr_in *netmask4 = (const struct sockaddr_in *) netmask;
    struct sockaddr_in *tmp;
    struct sockaddr_in network4;

    net = GNUNET_malloc (sizeof (struct ATS_Network) + 2 * sizeof (struct sockaddr_in));
    tmp = (struct sockaddr_in *) &net[1];
    net->network = (struct sockaddr *) &tmp[0];
    net->netmask = (struct sockaddr *) &tmp[1];
    net->length = addrlen;

    memset (&network4, 0, sizeof (network4));
    network4.sin_family = AF_INET;
#if HAVE_SOCKADDR_IN_SIN_LEN
    network4.sin_len = sizeof (network4);
#endif
    network4.sin_addr.s_addr = (addr4->sin_addr.s_addr & netmask4->sin_addr.s_addr);

    memcpy (net->netmask, netmask4, sizeof (struct sockaddr_in));
    memcpy (net->network, &network4, sizeof (struct sockaddr_in));
  }

  if (addr->sa_family == AF_INET6)
  {
    const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *) addr;
    const struct sockaddr_in6 *netmask6 = (const struct sockaddr_in6 *) netmask;
    struct sockaddr_in6 * tmp;
    struct sockaddr_in6 network6;

    net = GNUNET_malloc (sizeof (struct ATS_Network) + 2 * sizeof (struct sockaddr_in6));
    tmp = (struct sockaddr_in6 *) &net[1];
    net->network = (struct sockaddr *) &tmp[0];
    net->netmask = (struct sockaddr *) &tmp[1];
    net->length = addrlen;

    memset (&network6, 0, sizeof (network6));
    network6.sin6_family = AF_INET6;
#if HAVE_SOCKADDR_IN_SIN_LEN
    network6.sin6_len = sizeof (network6);
#endif
    unsigned int c = 0;
    uint32_t *addr_elem = (uint32_t *) &addr6->sin6_addr;
    uint32_t *mask_elem = (uint32_t *) &netmask6->sin6_addr;
    uint32_t *net_elem = (uint32_t *) &network6.sin6_addr;
    for (c = 0; c < 4; c++)
      net_elem[c] = addr_elem[c] & mask_elem[c];

    memcpy (net->netmask, netmask6, sizeof (struct sockaddr_in6));
    memcpy (net->network, &network6, sizeof (struct sockaddr_in6));
  }
  if (NULL == net)
    return GNUNET_OK; /* odd / unsupported address family */

  /* Store in list */
#if VERBOSE_ATS
  char * netmask = GNUNET_strdup (GNUNET_a2s((struct sockaddr *) net->netmask, addrlen));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Adding network `%s', netmask `%s'\n",
              GNUNET_a2s ((struct sockaddr *) net->network,
                          addrlen),
              netmask);
  GNUNET_free (netmask);
#endif
  GNUNET_CONTAINER_DLL_insert (sh->net_head,
                               sh->net_tail,
                               net);

  return GNUNET_OK;
}


/**
 * Periodically get list of network addresses from our interfaces.
 *
 * @param cls closure
 * @param tc Task context
 */
static void
get_addresses (void *cls,
               const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GNUNET_ATS_SchedulingHandle *sh = cls;

  sh->interface_task = NULL;
  delete_networks (sh);
  GNUNET_OS_network_interfaces_list (&interface_proc,
                                     sh);
  sh->interface_task = GNUNET_SCHEDULER_add_delayed (INTERFACE_PROCESSING_INTERVAL,
                                                     &get_addresses,
                                                     sh);
}


/**
 * Convert a `enum GNUNET_ATS_Network_Type` to a string
 *
 * @param net the network type
 * @return a string or NULL if invalid
 */
const char *
GNUNET_ATS_print_network_type (enum GNUNET_ATS_Network_Type net)
{
  switch (net)
    {
    case GNUNET_ATS_NET_UNSPECIFIED:
      return "UNSPECIFIED";
    case GNUNET_ATS_NET_LOOPBACK:
      return "LOOPBACK";
    case GNUNET_ATS_NET_LAN:
      return "LAN";
    case GNUNET_ATS_NET_WAN:
      return "WAN";
    case GNUNET_ATS_NET_WLAN:
      return "WLAN";
    case GNUNET_ATS_NET_BT:
      return "BLUETOOTH";
    default:
      return NULL;
    }
}


/**
 * Convert a ATS property to a string
 *
 * @param type the property type
 * @return a string or NULL if invalid
 */
const char *
GNUNET_ATS_print_property_type (enum GNUNET_ATS_Property type)
{
  switch (type)
  {
  case GNUNET_ATS_ARRAY_TERMINATOR:
    return "TERMINATOR";
  case GNUNET_ATS_UTILIZATION_OUT:
    return "UTILIZATION_UP";
  case GNUNET_ATS_UTILIZATION_IN:
    return "UTILIZATION_DOWN";
  case GNUNET_ATS_UTILIZATION_PAYLOAD_OUT:
    return "UTILIZATION_PAYLOAD_UP";
  case GNUNET_ATS_UTILIZATION_PAYLOAD_IN:
    return "UTILIZATION_PAYLOAD_DOWN";
  case GNUNET_ATS_NETWORK_TYPE:
    return "NETWORK_TYPE";
  case GNUNET_ATS_QUALITY_NET_DELAY:
    return "DELAY";
  case GNUNET_ATS_QUALITY_NET_DISTANCE:
    return "DISTANCE";
  case GNUNET_ATS_COST_WAN:
    return "COST_WAN";
  case GNUNET_ATS_COST_LAN:
    return "COST_LAN";
  case GNUNET_ATS_COST_WLAN:
    return "COST_WLAN";
  default:
    return NULL;
  }
}


/**
 * Returns where the address is located: LAN or WAN or ...
 *
 * @param sh the scheduling handle
 * @param addr address
 * @param addrlen address length
 * @return type of the network the address belongs to
 */
enum GNUNET_ATS_Network_Type
GNUNET_ATS_address_get_type (struct GNUNET_ATS_SchedulingHandle *sh,
                             const struct sockaddr *addr,
                             socklen_t addrlen)
{
  struct ATS_Network *cur = sh->net_head;
  enum GNUNET_ATS_NetworkType type = GNUNET_ATS_NET_UNSPECIFIED;

  switch (addr->sa_family)
    {
    case AF_UNIX:
      type = GNUNET_ATS_NET_LOOPBACK;
      break;
    case AF_INET:
      {
        const struct sockaddr_in *a4 = (const struct sockaddr_in *) addr;

        if ((a4->sin_addr.s_addr & htonl(0xff000000)) == htonl (0x7f000000))
          type = GNUNET_ATS_NET_LOOPBACK;
        break;
      }
    case AF_INET6:
      {
        const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) addr;

        if (IN6_IS_ADDR_LOOPBACK (&a6->sin6_addr))
          type = GNUNET_ATS_NET_LOOPBACK;
        break;
      }
    default:
      GNUNET_break (0);
      break;
   }

  /* Check local networks */
  while ((NULL != cur) && (GNUNET_ATS_NET_UNSPECIFIED == type))
  {
    if (addrlen != cur->length)
    {
      cur = cur->next;
      continue;
    }
    if (addr->sa_family == AF_INET)
    {
      const struct sockaddr_in *a4 = (const struct sockaddr_in *) addr;
      const struct sockaddr_in *net4 = (const struct sockaddr_in *) cur->network;
      const struct sockaddr_in *mask4 = (const struct sockaddr_in *) cur->netmask;

      if (((a4->sin_addr.s_addr & mask4->sin_addr.s_addr)) == net4->sin_addr.s_addr)
        type = GNUNET_ATS_NET_LAN;
    }
    if (addr->sa_family == AF_INET6)
    {
      const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) addr;
      const struct sockaddr_in6 *net6 = (const struct sockaddr_in6 *) cur->network;
      const struct sockaddr_in6 *mask6 = (const struct sockaddr_in6 *) cur->netmask;

      int res = GNUNET_YES;
      int c = 0;
      uint32_t *addr_elem = (uint32_t *) &a6->sin6_addr;
      uint32_t *mask_elem = (uint32_t *) &mask6->sin6_addr;
      uint32_t *net_elem = (uint32_t *) &net6->sin6_addr;
      for (c = 0; c < 4; c++)
        if ((addr_elem[c] & mask_elem[c]) != net_elem[c])
          res = GNUNET_NO;

      if (res == GNUNET_YES)
        type = GNUNET_ATS_NET_LAN;
    }
    cur = cur->next;
  }

  /* no local network found for this address, default: WAN */
  if (type == GNUNET_ATS_NET_UNSPECIFIED)
    type = GNUNET_ATS_NET_WAN;
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
                   "ats-scheduling-api",
                   "`%s' is in network `%s'\n",
                   GNUNET_a2s (addr,
                               addrlen),
                   GNUNET_ATS_print_network_type (type));
  return type;
}


/**
 * Initialize the ATS subsystem.
 *
 * @param cfg configuration to use
 * @param suggest_cb notification to call whenever the suggestation changed
 * @param suggest_cb_cls closure for @a suggest_cb
 * @return ats context
 */
struct GNUNET_ATS_SchedulingHandle *
GNUNET_ATS_scheduling_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
                            GNUNET_ATS_AddressSuggestionCallback suggest_cb,
                            void *suggest_cb_cls)
{
  struct GNUNET_ATS_SchedulingHandle *sh;

  sh = GNUNET_new (struct GNUNET_ATS_SchedulingHandle);
  sh->cfg = cfg;
  sh->suggest_cb = suggest_cb;
  sh->suggest_cb_cls = suggest_cb_cls;
  GNUNET_array_grow (sh->session_array,
                     sh->session_array_size,
                     4);
  sh->sug_requests = GNUNET_CONTAINER_multipeermap_create (32,
                                                           GNUNET_YES);
  GNUNET_OS_network_interfaces_list (&interface_proc,
                                     sh);
  sh->interface_task = GNUNET_SCHEDULER_add_delayed (INTERFACE_PROCESSING_INTERVAL,
                                                     &get_addresses,
                                                     sh);
  reconnect (sh);
  return sh;
}


/**
 * Function called to free all `struct GNUNET_ATS_SuggestHandles`
 * in the map.
 *
 * @param cls NULL
 * @param key the key
 * @param value the value to free
 * @return #GNUNET_OK (continue to iterate)
 */
static int
free_sug_handle (void *cls,
                 const struct GNUNET_PeerIdentity *key,
                 void *value)
{
  struct GNUNET_ATS_SuggestHandle *cur = value;

  GNUNET_free (cur);
  return GNUNET_OK;
}


/**
 * Client is done with ATS scheduling, release resources.
 *
 * @param sh handle to release
 */
void
GNUNET_ATS_scheduling_done (struct GNUNET_ATS_SchedulingHandle *sh)
{
  if (NULL != sh->mq)
  {
    GNUNET_MQ_destroy (sh->mq);
    sh->mq = NULL;
  }
  if (NULL != sh->client)
  {
    GNUNET_CLIENT_disconnect (sh->client);
    sh->client = NULL;
  }
  if (NULL != sh->task)
  {
    GNUNET_SCHEDULER_cancel (sh->task);
    sh->task = NULL;
  }
  GNUNET_CONTAINER_multipeermap_iterate (sh->sug_requests,
                                         &free_sug_handle,
                                         NULL);
  GNUNET_CONTAINER_multipeermap_destroy (sh->sug_requests);
  if (NULL != sh->interface_task)
  {
    GNUNET_SCHEDULER_cancel (sh->interface_task);
    sh->interface_task = NULL;
  }
  delete_networks (sh);
  GNUNET_array_grow (sh->session_array,
                     sh->session_array_size,
                     0);
  GNUNET_free (sh);
}


/**
 * We would like to reset the address suggestion block time for this
 * peer.
 *
 * @param sh handle
 * @param peer identity of the peer we want to reset
 */
void
GNUNET_ATS_reset_backoff (struct GNUNET_ATS_SchedulingHandle *sh,
                          const struct GNUNET_PeerIdentity *peer)
{
  struct GNUNET_MQ_Envelope *ev;
  struct ResetBackoffMessage *m;

  ev = GNUNET_MQ_msg (m, GNUNET_MESSAGE_TYPE_ATS_RESET_BACKOFF);
  m->reserved = htonl (0);
  m->peer = *peer;
  GNUNET_MQ_send (sh->mq, ev);
}


/**
 * We would like to receive address suggestions for a peer. ATS will
 * respond with a call to the continuation immediately containing an address or
 * no address if none is available. ATS can suggest more addresses until we call
 * #GNUNET_ATS_suggest_address_cancel().
 *
 * @param sh handle
 * @param peer identity of the peer we need an address for
 * @return suggest handle, NULL if a request is already pending
 */
struct GNUNET_ATS_SuggestHandle *
GNUNET_ATS_suggest_address (struct GNUNET_ATS_SchedulingHandle *sh,
                            const struct GNUNET_PeerIdentity *peer)
{
  struct GNUNET_ATS_SuggestHandle *s;

  s = GNUNET_new (struct GNUNET_ATS_SuggestHandle);
  s->id = *peer;
  if (GNUNET_OK !=
      GNUNET_CONTAINER_multipeermap_put (sh->sug_requests,
                                         &s->id,
                                         s,
                                         GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
  {
    GNUNET_break (0);
    return NULL;
  }
  if (NULL == sh->mq)
    return s;
  (void) transmit_suggestion (sh,
                              &s->id,
                              s);
  return s;
}


/**
 * We would like to stop receiving address updates for this peer
 *
 * @param sh handle
 * @param peer identity of the peer
 */
void
GNUNET_ATS_suggest_address_cancel (struct GNUNET_ATS_SchedulingHandle *sh,
                                   const struct GNUNET_PeerIdentity *peer)
{
  struct GNUNET_MQ_Envelope *ev;
  struct RequestAddressMessage *m;
  struct GNUNET_ATS_SuggestHandle *s;

  s = GNUNET_CONTAINER_multipeermap_get (sh->sug_requests,
                                         peer);
  if (NULL == s)
  {
    GNUNET_break (0);
    return;
  }
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_CONTAINER_multipeermap_remove (sh->sug_requests,
                                                       &s->id,
                                                       s));
  GNUNET_free (s);
  if (NULL == sh->mq)
    return;
  ev = GNUNET_MQ_msg (m, GNUNET_MESSAGE_TYPE_ATS_REQUEST_ADDRESS_CANCEL);
  m->reserved = htonl (0);
  m->peer = *peer;
  GNUNET_MQ_send (sh->mq, ev);
}


/**
 * Test if a address and a session is known to ATS
 *
 * @param sh the scheduling handle
 * @param address the address
 * @param session the session
 * @return #GNUNET_YES or #GNUNET_NO
 */
int
GNUNET_ATS_session_known (struct GNUNET_ATS_SchedulingHandle *sh,
                          const struct GNUNET_HELLO_Address *address,
                          struct Session *session)
{
  if (NULL == session)
    return GNUNET_NO;
  if (NOT_FOUND != find_session_id (sh,
                                    session,
                                    address))
    return GNUNET_YES;  /* Exists */
  return GNUNET_NO;
}


/**
 * We have a new address ATS should know. Addresses have to be added
 * with this function before they can be: updated, set in use and
 * destroyed.
 *
 * @param sh handle
 * @param address the address
 * @param session session handle, can be NULL
 * @param ats performance data for the address
 * @param ats_count number of performance records in @a ats
 * @return handle to the address representation inside ATS, NULL
 *         on error (i.e. ATS knows this exact address already)
 */
struct GNUNET_ATS_AddressRecord *
GNUNET_ATS_address_add (struct GNUNET_ATS_SchedulingHandle *sh,
                        const struct GNUNET_HELLO_Address *address,
                        struct Session *session,
                        const struct GNUNET_ATS_Information *ats,
                        uint32_t ats_count)
{
  struct GNUNET_ATS_AddressRecord *ar;
  size_t namelen;
  size_t msize;
  uint32_t s;

  if (NULL == address)
  {
    /* we need a valid address */
    GNUNET_break (0);
    return NULL;
  }
  namelen = (NULL == address->transport_name)
    ? 0
    : strlen (address->transport_name) + 1;
  msize = address->address_length +
    ats_count * sizeof (struct GNUNET_ATS_Information) + namelen;
  if ((msize + sizeof (struct AddressUpdateMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
      (address->address_length >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
      (namelen >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
      (ats_count >=
       GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_ATS_Information)))
  {
    /* address too large for us, this should not happen */
    GNUNET_break (0);
    return NULL;
  }

  if (NOT_FOUND != find_session_id (sh, session, address))
  {
    /* Already existing, nothing todo, but this should not happen */
    GNUNET_break (0);
    return NULL;
  }
  s = find_empty_session_slot (sh);
  ar = GNUNET_new (struct GNUNET_ATS_AddressRecord);
  ar->sh = sh;
  ar->slot = s;
  ar->session = session;
  ar->address = GNUNET_HELLO_address_copy (address);
  GNUNET_array_grow (ar->ats,
                     ar->ats_count,
                     ats_count);
  memcpy (ar->ats,
          ats,
          ats_count * sizeof (struct GNUNET_ATS_Information));
  sh->session_array[s] = ar;
  send_add_address_message (sh, ar);
  return ar;
}


/**
 * An address was used to initiate a session.
 *
 * @param ar address record to update information for
 * @param session session handle
 */
void
GNUNET_ATS_address_add_session (struct GNUNET_ATS_AddressRecord *ar,
                                struct Session *session)
{
  GNUNET_break (NULL == ar->session);
  ar->session = session;
}


/**
 * A session was destroyed, disassociate it from the
 * given address record.  If this was an incoming
 * addess, destroy the address as well.
 *
 * @param ar address record to update information for
 * @param session session handle
 * @return #GNUNET_YES if the @a ar was destroyed because
 *                     it was an incoming address,
 *         #GNUNET_NO if the @ar was kept because we can
 *                    use it still to establish a new session
 */
int
GNUNET_ATS_address_del_session (struct GNUNET_ATS_AddressRecord *ar,
                                struct Session *session)
{
  GNUNET_break (session == ar->session);
  ar->session = NULL;
  GNUNET_break (GNUNET_NO == ar->in_use);
  if (GNUNET_HELLO_address_check_option (ar->address,
                                         GNUNET_HELLO_ADDRESS_INFO_INBOUND))
  {
    GNUNET_ATS_address_destroy (ar);
    return GNUNET_YES;
  }
  return GNUNET_NO;
}


/**
 * We have updated performance statistics for a given address.  Note
 * that this function can be called for addresses that are currently
 * in use as well as addresses that are valid but not actively in use.
 * Furthermore, the peer may not even be connected to us right now (in
 * which case the call may be ignored or the information may be stored
 * for later use).  Update bandwidth assignments.
 *
 * @param ar address record to update information for
 * @param ats performance data for the address
 * @param ats_count number of performance records in @a ats
 */
void
GNUNET_ATS_address_update (struct GNUNET_ATS_AddressRecord *ar,
                           const struct GNUNET_ATS_Information *ats,
                           uint32_t ats_count)
{
  struct GNUNET_ATS_SchedulingHandle *sh = ar->sh;
  struct GNUNET_MQ_Envelope *ev;
  struct AddressUpdateMessage *m;
  struct GNUNET_ATS_Information *am;
  size_t msize;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Adding address for peer `%s', plugin `%s', session %p id %u\n",
              GNUNET_i2s (&ar->address->peer),
              ar->address->transport_name,
              ar->session,
              ar->slot);
  GNUNET_array_grow (ar->ats,
                     ar->ats_count,
                     ats_count);
  memcpy (ar->ats,
          ats,
          ats_count * sizeof (struct GNUNET_ATS_Information));

  if (NULL == sh->mq)
    return; /* disconnected, skip for now */
  msize = ar->ats_count * sizeof (struct GNUNET_ATS_Information);
  ev = GNUNET_MQ_msg_extra (m, msize, GNUNET_MESSAGE_TYPE_ATS_ADDRESS_UPDATE);
  m->ats_count = htonl (ar->ats_count);
  m->peer = ar->address->peer;
  m->session_id = htonl (ar->slot);
  am = (struct GNUNET_ATS_Information *) &m[1];
  memcpy (am,
          ar->ats,
          ar->ats_count * sizeof (struct GNUNET_ATS_Information));
  GNUNET_MQ_send (sh->mq, ev);
}


/**
 * An address is now in use or not used any more.
 *
 * @param ar the address
 * @param in_use #GNUNET_YES if this address is now used, #GNUNET_NO
 * if address is not used any more
 */
void
GNUNET_ATS_address_set_in_use (struct GNUNET_ATS_AddressRecord *ar,
                               int in_use)
{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Setting address used to %s for peer `%s', plugin `%s', session %p\n",
              (GNUNET_YES == in_use) ? "YES" : "NO",
              GNUNET_i2s (&ar->address->peer),
              ar->address->transport_name,
              ar->session);
  ar->in_use = in_use;
  if (NULL == ar->sh->mq)
    return;
  send_in_use_message (ar, in_use);
}


/**
 * An address got destroyed, stop using it as a valid address.
 *
 * @param ar address to destroy
 */
void
GNUNET_ATS_address_destroy (struct GNUNET_ATS_AddressRecord *ar)
{
  struct GNUNET_ATS_SchedulingHandle *sh = ar->sh;
  struct GNUNET_MQ_Envelope *ev;
  struct AddressDestroyedMessage *m;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Deleting address for peer `%s', plugin `%s', session %p\n",
              GNUNET_i2s (&ar->address->peer),
              ar->address->transport_name,
              ar->session);
  GNUNET_break (NULL == ar->session);
  ar->session = NULL;
  ar->in_destroy = GNUNET_YES;
  GNUNET_array_grow (ar->ats,
                     ar->ats_count,
                     0);
  if (NULL == sh->mq)
    return;
  ev = GNUNET_MQ_msg (m, GNUNET_MESSAGE_TYPE_ATS_ADDRESS_DESTROYED);
  m->session_id = htonl (ar->slot);
  m->peer = ar->address->peer;
  GNUNET_MQ_send (sh->mq, ev);
}


/* end of ats_api_scheduling.c */