aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/quic/quic.c
blob: c7e3339e5eec46b91caece5d04a428dc543f75bb (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
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
/*
 * Copyright (c) 2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <sys/socket.h>

#include <vnet/session/application.h>
#include <vnet/session/transport.h>
#include <vnet/session/session.h>
#include <vlib/unix/plugin.h>
#include <vpp/app/version.h>
#include <openssl/pem.h>

#include <vppinfra/lock.h>

#include <quic/quic.h>

#include <quicly/streambuf.h>
#include <picotls/openssl.h>
#include <picotls/pembase64.h>

static quic_main_t quic_main;

static void quic_update_timer (quic_ctx_t * ctx);
static int64_t quic_get_time (quicly_now_cb * self);
static void quic_connection_closed (u32 conn_index);
static void quic_disconnect (u32 ctx_index, u32 thread_index);

#define QUIC_INT_MAX  0x3FFFFFFFFFFFFFFF

u32
quic_ctx_half_open_alloc (void)
{
  quic_main_t *qm = &quic_main;
  u8 will_expand = 0;
  quic_ctx_t *ctx;
  u32 ctx_index;

  pool_get_aligned_will_expand (qm->half_open_ctx_pool, will_expand, 0);
  if (PREDICT_FALSE (will_expand && vlib_num_workers ()))
    {
      clib_rwlock_writer_lock (&qm->half_open_rwlock);
      pool_get (qm->half_open_ctx_pool, ctx);
      ctx_index = ctx - qm->half_open_ctx_pool;
      clib_rwlock_writer_unlock (&qm->half_open_rwlock);
    }
  else
    {
      /* reader lock assumption: only main thread will call pool_get */
      clib_rwlock_reader_lock (&qm->half_open_rwlock);
      pool_get (qm->half_open_ctx_pool, ctx);
      ctx_index = ctx - qm->half_open_ctx_pool;
      clib_rwlock_reader_unlock (&qm->half_open_rwlock);
    }
  memset (ctx, 0, sizeof (*ctx));
  return ctx_index;
}

void
quic_ctx_half_open_free (u32 ho_index)
{
  quic_main_t *qm = &quic_main;
  clib_rwlock_writer_lock (&qm->half_open_rwlock);
  pool_put_index (qm->half_open_ctx_pool, ho_index);
  clib_rwlock_writer_unlock (&qm->half_open_rwlock);
}

quic_ctx_t *
quic_ctx_half_open_get (u32 ctx_index)
{
  quic_main_t *qm = &quic_main;
  clib_rwlock_reader_lock (&qm->half_open_rwlock);
  return pool_elt_at_index (qm->half_open_ctx_pool, ctx_index);
}

void
quic_ctx_half_open_reader_unlock ()
{
  clib_rwlock_reader_unlock (&quic_main.half_open_rwlock);
}

u32
quic_ctx_half_open_index (quic_ctx_t * ctx)
{
  return (ctx - quic_main.half_open_ctx_pool);
}

u32
quic_ctx_alloc ()
{
  u8 thread_index = vlib_get_thread_index ();
  quic_main_t *qm = &quic_main;
  quic_ctx_t *ctx;

  pool_get (qm->ctx_pool[thread_index], ctx);

  memset (ctx, 0, sizeof (quic_ctx_t));
  ctx->c_thread_index = thread_index;
  return ctx - qm->ctx_pool[thread_index];
}

static void
quic_ctx_free (quic_ctx_t * ctx)
{
  QUIC_DBG (2, "Free ctx %u", ctx->c_c_index);
  u32 thread_index = ctx->c_thread_index;
  if (CLIB_DEBUG)
    memset (ctx, 0xfb, sizeof (*ctx));
  pool_put (quic_main.ctx_pool[thread_index], ctx);
}

static quic_ctx_t *
quic_ctx_get (u32 ctx_index)
{
  return pool_elt_at_index (quic_main.ctx_pool[vlib_get_thread_index ()],
			    ctx_index);
}

static quic_ctx_t *
quic_ctx_get_w_thread (u32 ctx_index, u8 thread_index)
{
  return pool_elt_at_index (quic_main.ctx_pool[thread_index], ctx_index);
}

static void
quic_disconnect_transport (quic_ctx_t * ctx)
{
  QUIC_DBG (2, "Called quic_disconnect_transport");
  vnet_disconnect_args_t a = {
    .handle = ctx->c_quic_ctx_id.quic_session,
    .app_index = quic_main.app_index,
  };

  if (vnet_disconnect_session (&a))
    clib_warning ("UDP session disconnect errored");
}

static int
quic_send_datagram (session_t * session, quicly_datagram_t * packet)
{
  QUIC_DBG (2, "Called quic_send_datagram at %ld", quic_get_time (NULL));
  u32 max_enqueue;
  session_dgram_hdr_t hdr;
  int rv;
  u32 len;
  svm_fifo_t *f;
  transport_connection_t *tc;

  len = packet->data.len;
  f = session->tx_fifo;
  tc = session_get_transport (session);

  max_enqueue = svm_fifo_max_enqueue (f);
  if (max_enqueue <= sizeof (session_dgram_hdr_t))
    return 1;

  max_enqueue -= sizeof (session_dgram_hdr_t);

  if (max_enqueue < len)
    return 1;

  // Build packet header for fifo
  hdr.data_length = len;
  hdr.data_offset = 0;
  hdr.is_ip4 = tc->is_ip4;
  clib_memcpy (&hdr.lcl_ip, &tc->lcl_ip, sizeof (ip46_address_t));
  hdr.lcl_port = tc->lcl_port;

  // Read dest address from quicly-provided sockaddr
  if (hdr.is_ip4)
    {
      ASSERT (packet->sa.sa_family == AF_INET);
      struct sockaddr_in *sa4 = (struct sockaddr_in *) &packet->sa;
      hdr.rmt_port = sa4->sin_port;
      hdr.rmt_ip.ip4.as_u32 = sa4->sin_addr.s_addr;
    }
  else
    {
      ASSERT (packet->sa.sa_family == AF_INET6);
      struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &packet->sa;
      hdr.rmt_port = sa6->sin6_port;
      clib_memcpy (&hdr.rmt_ip.ip6, &sa6->sin6_addr, 16);
    }

  rv = svm_fifo_enqueue_nowait (f, sizeof (hdr), (u8 *) & hdr);
  ASSERT (rv == sizeof (hdr));
  if (svm_fifo_enqueue_nowait (f, len, packet->data.base) != len)
    return 1;
  return 0;
}

static int
quic_send_packets (quic_ctx_t * ctx)
{
  //QUIC_DBG (2, "Called quic_send_packets");
  quicly_datagram_t *packets[16];
  session_t *quic_session;
  quicly_conn_t *conn;
  size_t num_packets, i;
  int ret;

  quic_session = session_get_from_handle (ctx->c_quic_ctx_id.quic_session);
  conn = ctx->c_quic_ctx_id.conn;

  if (!conn)
    return 0;

  do
    {
      num_packets = sizeof (packets) / sizeof (packets[0]);
      if ((ret = quicly_send (conn, packets, &num_packets)) == 0)
	{
	  for (i = 0; i != num_packets; ++i)
	    {
	      if (quic_send_datagram (quic_session, packets[i]))
		{
		  QUIC_DBG (2, "quic_send_datagram failed");
		  goto stop_sending;
		}
	      ret = 0;
	      quicly_default_free_packet_cb.cb
		(&quicly_default_free_packet_cb, packets[i]);
	    }
	}
      else
	{
	  QUIC_DBG (2, "quicly_send returned %d, closing connection\n", ret);
	  return ret;
	}
    }
  while (ret == 0 && num_packets == sizeof (packets) / sizeof (packets[0]));

stop_sending:
  if (svm_fifo_set_event (quic_session->tx_fifo))
    session_send_io_evt_to_thread (quic_session->tx_fifo, FIFO_EVENT_APP_TX);

  quic_update_timer (ctx);
  return 0;
}

/*****************************************************************************
 * START QUICLY CALLBACKS
 * Called from QUIC lib
 *****************************************************************************/

static int
quic_on_stop_sending (quicly_stream_t * stream, int error_code)
{
  QUIC_DBG (2, "received STOP_SENDING: %d", error_code);
  return 0;
}

static int
quic_on_receive_reset (quicly_stream_t * stream, int error_code)
{
  QUIC_DBG (2, "received RESET_STREAM: %d", error_code);
  return 0;
}

static int
quic_on_receive (quicly_stream_t * stream, size_t off, const void *src,
		 size_t len)
{
  QUIC_DBG (2, "received data: %lu bytes", len);
  u32 to_enqueue, ctx_id;
  quic_ctx_t *ctx;
  session_t *app_session;
  svm_fifo_t *rx_fifo;
  app_worker_t *app_wrk;

  ctx_id = (u64) * quicly_get_data (stream->conn);
  ctx = quic_ctx_get (ctx_id);
  app_session = session_get_from_handle (ctx->c_quic_ctx_id.app_session);
  rx_fifo = app_session->rx_fifo;
  to_enqueue = svm_fifo_max_enqueue (rx_fifo);
  if (to_enqueue > len)
    to_enqueue = len;
  // TODO what happens to the excess bytes?

  svm_fifo_enqueue_nowait (rx_fifo, to_enqueue, src);

  // Notify app
  app_wrk = app_worker_get_if_valid (app_session->app_wrk_index);
  if (PREDICT_TRUE (app_wrk != 0))
    app_worker_lock_and_send_event (app_wrk, app_session, SESSION_IO_EVT_RX);
  return 0;
}

static const quicly_stream_callbacks_t quic_stream_callbacks = {
  .on_destroy = quicly_streambuf_destroy,
  .on_send_shift = quicly_streambuf_egress_shift,
  .on_send_emit = quicly_streambuf_egress_emit,
  .on_send_stop = quic_on_stop_sending,
  .on_receive = quic_on_receive,
  .on_receive_reset = quic_on_receive_reset
};

static int
quic_on_stream_open (quicly_stream_open_cb * self, quicly_stream_t * stream)
{
  QUIC_DBG (2, "on_stream_open called");
  int ret;
  if ((ret =
       quicly_streambuf_create (stream, sizeof (quicly_streambuf_t))) != 0)
    {
      return ret;
    }
  stream->callbacks = &quic_stream_callbacks;
  return 0;
}

static quicly_stream_open_cb on_stream_open = { &quic_on_stream_open };

static void
quic_on_conn_close (quicly_closed_by_peer_cb * self, quicly_conn_t * conn,
		    int code, uint64_t frame_type,
		    const char *reason, size_t reason_len)
{
  QUIC_DBG (2, "connection closed, reason: %s", reason);
  u32 ctx_index = (u64) * quicly_get_data (conn);
  quic_connection_closed (ctx_index);
}

static quicly_closed_by_peer_cb on_closed_by_peer = { &quic_on_conn_close };


/*****************************************************************************
 * END QUICLY CALLBACKS
 *****************************************************************************/

/* single-entry session cache */
struct st_util_session_cache_t
{
  ptls_encrypt_ticket_t super;
  uint8_t id[32];
  ptls_iovec_t data;
};

static int
encrypt_ticket_cb (ptls_encrypt_ticket_t * _self, ptls_t * tls,
		   int is_encrypt, ptls_buffer_t * dst, ptls_iovec_t src)
{
  struct st_util_session_cache_t *self = (void *) _self;
  int ret;

  if (is_encrypt)
    {

      /* replace the cached entry along with a newly generated session id */
      free (self->data.base);
      if ((self->data.base = malloc (src.len)) == NULL)
	return PTLS_ERROR_NO_MEMORY;

      ptls_get_context (tls)->random_bytes (self->id, sizeof (self->id));
      memcpy (self->data.base, src.base, src.len);
      self->data.len = src.len;

      /* store the session id in buffer */
      if ((ret = ptls_buffer_reserve (dst, sizeof (self->id))) != 0)
	return ret;
      memcpy (dst->base + dst->off, self->id, sizeof (self->id));
      dst->off += sizeof (self->id);

    }
  else
    {

      /* check if session id is the one stored in cache */
      if (src.len != sizeof (self->id))
	return PTLS_ERROR_SESSION_NOT_FOUND;
      if (memcmp (self->id, src.base, sizeof (self->id)) != 0)
	return PTLS_ERROR_SESSION_NOT_FOUND;

      /* return the cached value */
      if ((ret = ptls_buffer_reserve (dst, self->data.len)) != 0)
	return ret;
      memcpy (dst->base + dst->off, self->data.base, self->data.len);
      dst->off += self->data.len;
    }

  return 0;
}

static struct st_util_session_cache_t sc = {
  .super = {
	    .cb = encrypt_ticket_cb,
	    },
};

/* *INDENT-OFF* */
static ptls_context_t quic_tlsctx = {
  .random_bytes = ptls_openssl_random_bytes,
  .get_time = &ptls_get_time,
  .key_exchanges = ptls_openssl_key_exchanges,
  .cipher_suites = ptls_openssl_cipher_suites,
  .certificates = {
    .list = NULL,
    .count = 0
  },
  .esni = NULL,
  .on_client_hello = NULL,
  .emit_certificate = NULL,
  .sign_certificate = NULL,
  .verify_certificate = NULL,
  .ticket_lifetime = 86400,
  .max_early_data_size = 8192,
  .hkdf_label_prefix__obsolete = NULL,
  .require_dhe_on_psk = 1,
  .encrypt_ticket = &sc.super,
};
/* *INDENT-ON* */

static int
ptls_compare_separator_line (const char *line, const char *begin_or_end,
			     const char *label)
{
  int ret = strncmp (line, "-----", 5);
  size_t text_index = 5;

  if (ret == 0)
    {
      size_t begin_or_end_length = strlen (begin_or_end);
      ret = strncmp (line + text_index, begin_or_end, begin_or_end_length);
      text_index += begin_or_end_length;
    }

  if (ret == 0)
    {
      ret = line[text_index] - ' ';
      text_index++;
    }

  if (ret == 0)
    {
      size_t label_length = strlen (label);
      ret = strncmp (line + text_index, label, label_length);
      text_index += label_length;
    }

  if (ret == 0)
    {
      ret = strncmp (line + text_index, "-----", 5);
    }

  return ret;
}

static int
ptls_get_bio_pem_object (BIO * bio, const char *label, ptls_buffer_t * buf)
{
  int ret = PTLS_ERROR_PEM_LABEL_NOT_FOUND;
  char line[256];
  ptls_base64_decode_state_t state;

  /* Get the label on a line by itself */
  while (BIO_gets (bio, line, 256))
    {
      if (ptls_compare_separator_line (line, "BEGIN", label) == 0)
	{
	  ret = 0;
	  ptls_base64_decode_init (&state);
	  break;
	}
    }
  /* Get the data in the buffer */
  while (ret == 0 && BIO_gets (bio, line, 256))
    {
      if (ptls_compare_separator_line (line, "END", label) == 0)
	{
	  if (state.status == PTLS_BASE64_DECODE_DONE
	      || (state.status == PTLS_BASE64_DECODE_IN_PROGRESS
		  && state.nbc == 0))
	    {
	      ret = 0;
	    }
	  else
	    {
	      ret = PTLS_ERROR_INCORRECT_BASE64;
	    }
	  break;
	}
      else
	{
	  ret = ptls_base64_decode (line, &state, buf);
	}
    }

  return ret;
}

int
ptls_load_bio_pem_objects (BIO * bio, const char *label, ptls_iovec_t * list,
			   size_t list_max, size_t * nb_objects)
{
  int ret = 0;
  size_t count = 0;

  *nb_objects = 0;

  if (ret == 0)
    {
      while (count < list_max)
	{
	  ptls_buffer_t buf;

	  ptls_buffer_init (&buf, "", 0);

	  ret = ptls_get_bio_pem_object (bio, label, &buf);

	  if (ret == 0)
	    {
	      if (buf.off > 0 && buf.is_allocated)
		{
		  list[count].base = buf.base;
		  list[count].len = buf.off;
		  count++;
		}
	      else
		{
		  ptls_buffer_dispose (&buf);
		}
	    }
	  else
	    {
	      ptls_buffer_dispose (&buf);
	      break;
	    }
	}
    }

  if (ret == PTLS_ERROR_PEM_LABEL_NOT_FOUND && count > 0)
    {
      ret = 0;
    }

  *nb_objects = count;

  return ret;
}

#define PTLS_MAX_CERTS_IN_CONTEXT 16

int
ptls_load_bio_certificates (ptls_context_t * ctx, BIO * bio)
{
  int ret = 0;

  ctx->certificates.list =
    (ptls_iovec_t *) malloc (PTLS_MAX_CERTS_IN_CONTEXT *
			     sizeof (ptls_iovec_t));

  if (ctx->certificates.list == NULL)
    {
      ret = PTLS_ERROR_NO_MEMORY;
    }
  else
    {
      ret =
	ptls_load_bio_pem_objects (bio, "CERTIFICATE", ctx->certificates.list,
				   PTLS_MAX_CERTS_IN_CONTEXT,
				   &ctx->certificates.count);
    }

  return ret;
}

static inline void
load_bio_certificate_chain (ptls_context_t * ctx, const char *cert_data)
{
  BIO *cert_bio;
  cert_bio = BIO_new_mem_buf (cert_data, -1);
  if (ptls_load_bio_certificates (ctx, cert_bio) != 0)
    {
      BIO_free (cert_bio);
      fprintf (stderr, "failed to load certificate:%s\n", strerror (errno));
      exit (1);
    }
  BIO_free (cert_bio);
}

static inline void
load_bio_private_key (ptls_context_t * ctx, const char *pk_data)
{
  static ptls_openssl_sign_certificate_t sc;
  EVP_PKEY *pkey;
  BIO *key_bio;

  key_bio = BIO_new_mem_buf (pk_data, -1);
  pkey = PEM_read_bio_PrivateKey (key_bio, NULL, NULL, NULL);
  BIO_free (key_bio);

  if (pkey == NULL)
    {
      fprintf (stderr, "failed to read private key from app configuration\n");
      exit (1);
    }

  ptls_openssl_init_sign_certificate (&sc, pkey);
  EVP_PKEY_free (pkey);

  ctx->sign_certificate = &sc.super;
}

static void
quic_connection_closed (u32 ctx_index)
{
  QUIC_DBG (2, "QUIC connection closed");
  quic_ctx_t *ctx;

  ctx = quic_ctx_get (ctx_index);
  // TODO if connection is not established, just delete the session

  // Do not try to send anything anymore
  ctx->stream = NULL;
  quicly_free (ctx->c_quic_ctx_id.conn);
  ctx->c_quic_ctx_id.conn = NULL;
  session_transport_closing_notify (&ctx->connection);
}

static int64_t
quic_get_time (quicly_now_cb * self)
{
  // TODO read value set by set_time_now?
  // (needs to change it not to call this function)
  vlib_main_t *vlib_main = vlib_get_main ();
  f64 time = vlib_time_now (vlib_main);
  return (int64_t) (time * 1000.f);
}
quicly_now_cb quicly_vpp_now_cb = { quic_get_time };

static void
allocate_quicly_ctx (application_t * app, u8 is_client)
{
  QUIC_DBG (2, "Called allocate_quicly_ctx");
  struct
  {
    quicly_context_t _;
    char cid_key[17];
  } *ctx_data;
  quicly_context_t *quicly_ctx;
  char *cid_key;

  ctx_data = malloc (sizeof (*ctx_data));
  quicly_ctx = &ctx_data->_;
  app->quicly_ctx = (u64 *) quicly_ctx;
  memcpy (quicly_ctx, &quicly_default_context, sizeof (quicly_context_t));

  quicly_ctx->tls = &quic_tlsctx;
  quicly_ctx->stream_open = &on_stream_open;
  quicly_ctx->closed_by_peer = &on_closed_by_peer;
  quicly_ctx->now = &quicly_vpp_now_cb;

  quicly_amend_ptls_context (quicly_ctx->tls);

  quicly_ctx->event_log.mask = INT64_MAX;
  quicly_ctx->event_log.cb = quicly_new_default_event_log_cb (stderr);

  quicly_ctx->transport_params.max_data = QUIC_INT_MAX;
  quicly_ctx->transport_params.max_streams_uni = QUIC_INT_MAX;
  quicly_ctx->transport_params.max_streams_bidi = QUIC_INT_MAX;
  quicly_ctx->transport_params.max_stream_data.bidi_local = QUIC_INT_MAX;
  quicly_ctx->transport_params.max_stream_data.bidi_remote = QUIC_INT_MAX;
  quicly_ctx->transport_params.max_stream_data.uni = QUIC_INT_MAX;

  if (!is_client)
    {
      load_bio_private_key (quicly_ctx->tls, (char *) app->tls_key);
      load_bio_certificate_chain (quicly_ctx->tls, (char *) app->tls_cert);
      cid_key = ctx_data->cid_key;
      quicly_ctx->tls->random_bytes (cid_key, 16);
      cid_key[16] = 0;
      quicly_ctx->encrypt_cid =
	quicly_new_default_encrypt_cid_cb (&ptls_openssl_bfecb,
					   &ptls_openssl_sha256,
					   ptls_iovec_init (cid_key,
							    strlen
							    (cid_key)));
      quicly_ctx->decrypt_cid =
	quicly_new_default_decrypt_cid_cb (&ptls_openssl_bfecb,
					   &ptls_openssl_sha256,
					   ptls_iovec_init (cid_key,
							    strlen
							    (cid_key)));
    }
}


/*****************************************************************************
 * BEGIN TIMERS HANDLING
 *****************************************************************************/

static u32
quic_set_time_now (u32 thread_index)
{
  quic_main.wrk_ctx[thread_index].time_now = quic_get_time (NULL);
  return quic_main.wrk_ctx[thread_index].time_now;
}

static void
quic_timer_expired (u32 conn_index)
{
  quic_ctx_t *ctx;
  QUIC_DBG (2, "Timer expired for conn %u at %ld", conn_index,
	    quic_get_time (NULL));
  ctx = quic_ctx_get (conn_index);
  ctx->c_quic_ctx_id.timer_handle = QUIC_TIMER_HANDLE_INVALID;
  if (quic_send_packets (ctx))
    {
      quic_connection_closed (conn_index);
    }
}

static void
quic_update_timer (quic_ctx_t * ctx)
{
  tw_timer_wheel_1t_3w_1024sl_ov_t *tw;
  int64_t next_timeout;

  // This timeout is in ms which is the unit of our timer
  next_timeout = quicly_get_first_timeout (ctx->c_quic_ctx_id.conn);
  tw = &quic_main.wrk_ctx[vlib_get_thread_index ()].timer_wheel;
  f64 next_timeout_f = ((f64) next_timeout) / 1000.f;

  clib_warning ("Timer set to %ld (%lf)", next_timeout, next_timeout_f);

  if (ctx->c_quic_ctx_id.timer_handle == QUIC_TIMER_HANDLE_INVALID)
    {
      if (next_timeout == INT64_MAX)
	return;
      ctx->c_quic_ctx_id.timer_handle =
	tw_timer_start_1t_3w_1024sl_ov (tw, ctx->c_c_index, 0,
					next_timeout_f);
    }
  else
    {
      if (next_timeout == INT64_MAX)
	{
	  tw_timer_stop_1t_3w_1024sl_ov (tw, ctx->c_quic_ctx_id.timer_handle);
	  ctx->c_quic_ctx_id.timer_handle = QUIC_TIMER_HANDLE_INVALID;
	}
      else
	tw_timer_update_1t_3w_1024sl_ov (tw, ctx->c_quic_ctx_id.timer_handle,
					 next_timeout_f);
    }
}

static void
quic_expired_timers_dispatch (u32 * expired_timers)
{
  int i;

  for (i = 0; i < vec_len (expired_timers); i++)
    {
      quic_timer_expired (expired_timers[i]);
    }
}


/*****************************************************************************
 * END TIMERS HANDLING
 *
 * BEGIN TRANSPORT PROTO FUNCTIONS
 *****************************************************************************/

int
quic_connect (transport_endpoint_cfg_t * tep)
{
  QUIC_DBG (2, "Called quic_connect");
  vnet_connect_args_t _cargs = { {}, }, *cargs = &_cargs;
  session_endpoint_cfg_t *sep;
  quic_main_t *qm = &quic_main;
  quic_ctx_t *ctx;
  app_worker_t *app_wrk;
  application_t *app;
  u32 ctx_index;
  int error;

  sep = (session_endpoint_cfg_t *) tep;
  ctx_index = quic_ctx_half_open_alloc ();
  ctx = quic_ctx_half_open_get (ctx_index);
  ctx->c_quic_ctx_id.parent_app_wrk_idx = sep->app_wrk_index;
  ctx->c_s_index = 0xFAFAFAFA;
  ctx->c_quic_ctx_id.udp_is_ip4 = sep->is_ip4;
  ctx->c_quic_ctx_id.timer_handle = QUIC_TIMER_HANDLE_INVALID;
  ctx->c_quic_ctx_id.conn_state = QUIC_CONN_STATE_HANDSHAKE;
  ctx->client_opaque = sep->opaque;
  if (sep->hostname)
    {
      ctx->srv_hostname = format (0, "%v", sep->hostname);
      vec_terminate_c_string (ctx->srv_hostname);
    }
  else
    {
      // needed by quic for crypto + determining client / server
      ctx->srv_hostname =
	format (0, "%U", format_ip46_address, &sep->ip, sep->is_ip4);
    }

  quic_ctx_half_open_reader_unlock ();

  clib_memcpy (&cargs->sep, sep, sizeof (session_endpoint_cfg_t));
  cargs->sep.transport_proto = TRANSPORT_PROTO_UDP;
  cargs->app_index = qm->app_index;
  cargs->api_context = ctx_index;

  app_wrk = app_worker_get (sep->app_wrk_index);
  app = application_get (app_wrk->app_index);
  ctx->c_quic_ctx_id.parent_app_id = app_wrk->app_index;
  cargs->sep_ext.ns_index = app->ns_index;

  allocate_quicly_ctx (app, 1 /* is client */ );

  if ((error = vnet_connect (cargs)))
    return error;

  QUIC_DBG (1, "New connect request %u", ctx_index);
  return 0;
}

static void
quic_disconnect (u32 ctx_index, u32 thread_index)
{
  QUIC_DBG (2, "Called quic_disconnect");
  tw_timer_wheel_1t_3w_1024sl_ov_t *tw;
  quic_ctx_t *ctx;

  QUIC_DBG (1, "Disconnecting %x", ctx_index);

  ctx = quic_ctx_get (ctx_index);
  if (ctx->c_quic_ctx_id.timer_handle != QUIC_TIMER_HANDLE_INVALID)
    {
      tw = &quic_main.wrk_ctx[vlib_get_thread_index ()].timer_wheel;
      tw_timer_stop_1t_3w_1024sl_ov (tw, ctx->c_quic_ctx_id.timer_handle);
    }
  quic_disconnect_transport (ctx);
  // This removes the session from the lookup table and frees it.
  session_transport_delete_notify (&ctx->connection);
  quic_ctx_free (ctx);
}

u32
quic_start_listen (u32 app_listen_session_index, transport_endpoint_t * tep)
{
  QUIC_DBG (2, "Called quic_start_listen");
  vnet_listen_args_t _bargs, *args = &_bargs;
  quic_main_t *qm = &quic_main;
  session_handle_t udp_handle;
  session_endpoint_cfg_t *sep;
  session_t *quic_listen_session, *app_listen_session;
  app_worker_t *app_wrk;
  application_t *app;
  quic_ctx_t *lctx;
  u32 lctx_index;
  app_listener_t *app_listener;

  sep = (session_endpoint_cfg_t *) tep;
  app_wrk = app_worker_get (sep->app_wrk_index);
  app = application_get (app_wrk->app_index);

  allocate_quicly_ctx (app, 0 /* is_client */ );

  sep->transport_proto = TRANSPORT_PROTO_UDP;
  memset (args, 0, sizeof (*args));
  args->app_index = qm->app_index;
  args->sep_ext = *sep;
  args->sep_ext.ns_index = app->ns_index;
  if (vnet_listen (args))
    return -1;

  lctx_index = quic_ctx_alloc ();	// listener
  udp_handle = args->handle;
  app_listener = app_listener_get_w_handle (udp_handle);
  quic_listen_session = app_listener_get_session (app_listener);
  quic_listen_session->opaque = lctx_index;

  app_listen_session = listen_session_get (app_listen_session_index);

  lctx = quic_ctx_get (lctx_index);	// listener
  lctx->is_listener = 1;
  lctx->c_quic_ctx_id.parent_app_wrk_idx = sep->app_wrk_index;
  lctx->c_quic_ctx_id.parent_app_id = app_wrk->app_index;
  lctx->c_quic_ctx_id.quic_session = udp_handle;
  lctx->c_quic_ctx_id.app_session =
    listen_session_get_handle (app_listen_session);
  lctx->c_quic_ctx_id.udp_is_ip4 = sep->is_ip4;

  QUIC_DBG (1, "Started listening %d", lctx_index);
  return lctx_index;
}

u32
quic_stop_listen (u32 lctx_index)
{
  QUIC_DBG (2, "Called quic_stop_listen");
  quic_ctx_t *lctx;

  lctx = quic_ctx_get (lctx_index);	// listener
  vnet_unlisten_args_t a = {
    .handle = lctx->c_quic_ctx_id.quic_session,
    .app_index = quic_main.app_index,
    .wrk_map_index = 0		/* default wrk */
  };
  if (vnet_unlisten (&a))
    clib_warning ("unlisten errored");

  // TODO: crypto state cleanup

  quic_ctx_free (lctx);		// listener
  return 0;
}

transport_connection_t *
quic_connection_get (u32 ctx_index, u32 thread_index)
{
  QUIC_DBG (2, "Called quic_connection_get");
  quic_ctx_t *ctx;
  ctx = quic_ctx_get_w_thread (ctx_index, thread_index);
  return &ctx->connection;
}

transport_connection_t *
quic_listener_get (u32 listener_index)
{
  QUIC_DBG (2, "Called quic_listener_get");
  quic_ctx_t *ctx;
  ctx = quic_ctx_get (listener_index);
  return &ctx->connection;
}

static void
quic_update_time (f64 now, u8 thread_index)
{
  tw_timer_wheel_1t_3w_1024sl_ov_t *tw;

  tw = &quic_main.wrk_ctx[thread_index].timer_wheel;
  quic_set_time_now (thread_index);
  tw_timer_expire_timers_1t_3w_1024sl_ov (tw, now);
}

static u8 *
format_quic_connection (u8 * s, va_list * args)
{
  s = format (s, "[QUIC] connection");
  return s;
}

static u8 *
format_quic_half_open (u8 * s, va_list * args)
{
  u32 qc_index = va_arg (*args, u32);
  quic_ctx_t *ctx = quic_ctx_half_open_get (qc_index);
  s = format (s, "[QUIC] half-open app %u", ctx->c_quic_ctx_id.parent_app_id);
  quic_ctx_half_open_reader_unlock ();
  return s;
}

// TODO improve
static u8 *
format_quic_listener (u8 * s, va_list * args)
{
  s = format (s, "[QUIC] listener");
  return s;
}

/*****************************************************************************
 * END TRANSPORT PROTO FUNCTIONS
 *
 * START SESSION CALLBACKS
 * Called from UDP layer
 *****************************************************************************/

static inline void
quic_build_sockaddr (struct sockaddr *sa, socklen_t * salen,
		     ip46_address_t * addr, u16 port, u8 is_ip4)
{
  if (is_ip4)
    {
      struct sockaddr_in *sa4 = (struct sockaddr_in *) sa;
      sa4->sin_family = AF_INET;
      sa4->sin_port = port;
      sa4->sin_addr.s_addr = addr->ip4.as_u32;
      *salen = sizeof (struct sockaddr_in);
    }
  else
    {
      struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) sa;
      sa6->sin6_family = AF_INET6;
      sa6->sin6_port = port;
      clib_memcpy (&sa6->sin6_addr, &addr->ip6, 16);
      *salen = sizeof (struct sockaddr_in6);
    }
}

static int
quic_delayed_notify_app_connected (void *ctx_index)
{
  QUIC_DBG (1, "quic_notify_app_connected");
  session_t *app_session;
  app_worker_t *app_wrk;
  quic_ctx_t *ctx;
  ctx = quic_ctx_get ((u32) (u64) ctx_index);

  app_wrk = app_worker_get_if_valid (ctx->c_quic_ctx_id.parent_app_wrk_idx);
  if (!app_wrk)
    {
      quic_disconnect_transport (ctx);
      return -1;
    }

  app_session = session_alloc (ctx->c_thread_index);
  QUIC_DBG (1, "Created app_session, id %u", app_session->session_index);
  ctx->c_s_index = app_session->session_index;
  app_session->app_wrk_index = ctx->c_quic_ctx_id.parent_app_wrk_idx;
  app_session->connection_index = ctx->c_c_index;
  app_session->session_type =
    session_type_from_proto_and_ip (TRANSPORT_PROTO_QUIC,
				    ctx->c_quic_ctx_id.udp_is_ip4);

  if (app_worker_init_connected (app_wrk, app_session))	// TODO dont allocate fifos
    {
      quic_disconnect (ctx->c_c_index, vlib_get_thread_index ());
      return app_worker_connect_notify (app_wrk, NULL, ctx->client_opaque);
    }

  app_session->session_state = SESSION_STATE_CONNECTING;
  if (app_worker_connect_notify (app_wrk, app_session, ctx->client_opaque))
    {
      QUIC_DBG (1, "failed to notify app");
      quic_disconnect (ctx->c_c_index, vlib_get_thread_index ());
      return -1;
    }

  ctx->c_quic_ctx_id.app_session = session_handle (app_session);
  app_session->session_state = SESSION_STATE_LISTENING;
  session_lookup_add_connection (&ctx->connection,
				 session_handle (app_session));

  return 0;
}

int
quic_session_connected_callback (u32 quic_app_index, u32 ho_ctx_idx,
				 session_t * s, u8 is_fail)
{
  QUIC_DBG (2, "Called quic_session_connected_callback");
  // This should always be called before quic_connect returns since UDP always
  // connects instantly.
  struct sockaddr_in6 sa6;
  struct sockaddr *sa = (struct sockaddr *) &sa6;
  socklen_t salen;
  transport_connection_t *tc;
  quic_ctx_t *ho_ctx, *ctx;
  u32 ctx_index;
  int ret;
  application_t *app;
  app_worker_t *app_wrk;

  ho_ctx = quic_ctx_half_open_get (ho_ctx_idx);
  if (is_fail)
    {
      u32 api_context;
      int rv = 0;

      app_wrk =
	app_worker_get_if_valid (ho_ctx->c_quic_ctx_id.parent_app_wrk_idx);
      if (app_wrk)
	{
	  api_context = ho_ctx->c_s_index;
	  app_worker_connect_notify (app_wrk, 0, api_context);
	}
      quic_ctx_half_open_reader_unlock ();
      quic_ctx_half_open_free (ho_ctx_idx);
      return rv;
    }

  app_wrk =
    app_worker_get_if_valid (ho_ctx->c_quic_ctx_id.parent_app_wrk_idx);
  if (!app_wrk)
    {
      QUIC_DBG (1, "Appwrk not found");
      return -1;
    }
  app = application_get (app_wrk->app_index);

  ctx_index = quic_ctx_alloc ();
  ctx = quic_ctx_get (ctx_index);
  clib_memcpy (ctx, ho_ctx, sizeof (*ctx));
  quic_ctx_half_open_reader_unlock ();	// TODO: this is a race
  quic_ctx_half_open_free (ho_ctx_idx);

  ctx->c_thread_index = vlib_get_thread_index ();
  ctx->c_c_index = ctx_index;

  QUIC_DBG (1, "Quic connect for returned %u. New connection [%u]%x",
	    is_fail, vlib_get_thread_index (), (ctx) ? ctx_index : ~0);

  ctx->c_quic_ctx_id.quic_session = session_handle (s);
  s->opaque = ctx_index;
  s->session_state = SESSION_STATE_READY;

  // Init QUIC lib connection
  // Generate required sockaddr & salen
  tc = session_get_transport (s);
  quic_build_sockaddr (sa, &salen, &tc->rmt_ip, tc->rmt_port, tc->is_ip4);

  ret =
    quicly_connect (&ctx->c_quic_ctx_id.conn,
		    (quicly_context_t *) app->quicly_ctx,
		    (char *) ctx->srv_hostname, sa, salen,
		    &quic_main.next_cid, &quic_main.hs_properties, NULL);
  ++quic_main.next_cid.master_id;
  // Save context handle in quicly connection
  *quicly_get_data (ctx->c_quic_ctx_id.conn) = (void *) (u64) ctx_index;
  assert (ret == 0);

  if (quic_send_packets (ctx))
    {
      quic_connection_closed (ctx_index);
    }
  return ret;
}

void
quic_session_disconnect_callback (session_t * s)
{
  clib_warning ("UDP session disconnected???");
}

void
quic_session_reset_callback (session_t * s)
{
  clib_warning ("UDP session reset???");
}

static int
quic_add_segment_callback (u32 client_index, u64 seg_handle)
{
  QUIC_DBG (2, "Called quic_add_segment_callback");
  QUIC_DBG (2, "NOT IMPLEMENTED");
  /* No-op for builtin */
  return 0;
}

static int
quic_del_segment_callback (u32 client_index, u64 seg_handle)
{
  QUIC_DBG (2, "Called quic_del_segment_callback");
  QUIC_DBG (2, "NOT IMPLEMENTED");
  /* No-op for builtin */
  return 0;
}

int
quic_add_vpp_q_builtin_tx_evt (session_t * s)
{
  if (svm_fifo_set_event (s->tx_fifo))
    session_send_io_evt_to_thread_custom (s, s->thread_index,
					  FIFO_EVENT_BUILTIN_TX);
  return 0;
}

void
quic_open_stream_if_ready (quic_ctx_t * ctx)
{
  quicly_conn_t *conn = ctx->c_quic_ctx_id.conn;
  if (ctx->stream)
    {
      QUIC_DBG (2, "----------- > FOUND Stream id %d",
		ctx->stream->stream_id);
      QUIC_DBG (2, "----------- > FOUND Stream is_open %d",
		ctx->stream->sendstate.is_open);
      return;
    }
  if (quicly_connection_is_ready (conn))
    assert (!quicly_open_stream (conn, &ctx->stream, 0));
  QUIC_DBG (2, "Stream id %d", ctx->stream->stream_id);
  QUIC_DBG (2, "Stream is_open %d", ctx->stream->sendstate.is_open);
}

int
quic_custom_tx_callback (void *session)
{
  QUIC_DBG (2, "Called quic_custom_tx_callback");
  session_t *app_session = (session_t *) session;
  quic_ctx_t *ctx;
  svm_fifo_t *f;
  u32 deq_max;
  u8 *data;

  if (PREDICT_FALSE
      (app_session->session_state >= SESSION_STATE_TRANSPORT_CLOSING))
    return 0;
  ctx = quic_ctx_get (app_session->connection_index);
  quic_open_stream_if_ready (ctx);
  if (!ctx->stream)
    {
      quic_add_vpp_q_builtin_tx_evt (app_session);
      return 0;
    }

  f = app_session->tx_fifo;
  deq_max = svm_fifo_max_dequeue (f);
  if (!deq_max)
    return 0;

  data = svm_fifo_head (f);
  if (quicly_streambuf_egress_write (ctx->stream, data, deq_max))
    {
      assert (0);
      return 0;
    }
  QUIC_DBG (2, "Sent %u bytes", deq_max);
  svm_fifo_dequeue_drop (f, deq_max);
  if (quic_send_packets (ctx))
    {
      quic_connection_closed (ctx->c_c_index);
    }
  return 0;
}

int
quic_find_packet_ctx (quic_ctx_t ** ctx, quicly_conn_t ** conn,
		      struct sockaddr *sa, socklen_t salen,
		      quicly_decoded_packet_t packet)
{
  quic_ctx_t *ctx_;
  quicly_conn_t *conn_;
  /* *INDENT-OFF* */
  pool_foreach (ctx_, quic_main.ctx_pool[vlib_get_thread_index()],
  ({
    conn_ = ctx_->c_quic_ctx_id.conn;
    if (conn_ && !ctx_->is_listener)
      {
        if (quicly_is_destination(conn_, sa, salen, &packet))
          {
            *conn = conn_;
            *ctx = ctx_;
            QUIC_DBG (2, "connection_found");
            return 0;
          }
      }
  }));
  /* *INDENT-ON* */
  return 0;
}

static int
quic_receive (quic_ctx_t * ctx, quicly_conn_t * conn,
	      quicly_decoded_packet_t packet)
{
  quicly_receive (conn, &packet);
  // Conn may be set to null if the connection is terminated
  if (ctx->c_quic_ctx_id.conn
      && ctx->c_quic_ctx_id.conn_state == QUIC_CONN_STATE_HANDSHAKE)
    {
      if (quicly_connection_is_ready (conn))
	{
	  ctx->c_quic_ctx_id.conn_state = QUIC_CONN_STATE_READY;
	  if (quicly_is_client (conn))
	    session_send_rpc_evt_to_thread_force (vlib_get_thread_index (),
						  &quic_delayed_notify_app_connected,
						  (void *) (u64)
						  ctx->c_c_index);
	}
    }
  if (quic_send_packets (ctx))
    {
      quic_connection_closed (ctx->c_c_index);
    }
  return 0;
}

static int
quic_delayed_create_app_session (void *ctx_index)
{
  quic_ctx_t *lctx, *ctx;
  session_t *app_session, *app_listen_session;
  app_worker_t *app_wrk;
  int rv;

  ctx = quic_ctx_get ((u32) (u64) ctx_index);
  app_session = session_alloc (ctx->c_thread_index);
  app_session->session_state = SESSION_STATE_LISTENING;
  ctx->c_s_index = app_session->session_index;

  lctx = quic_ctx_get (ctx->c_quic_ctx_id.listener_ctx_id);

  app_listen_session =
    listen_session_get_from_handle (lctx->c_quic_ctx_id.app_session);
  app_session->app_wrk_index = lctx->c_quic_ctx_id.parent_app_wrk_idx;
  app_session->connection_index = ctx->c_c_index;
  app_session->session_type = app_listen_session->session_type;
  app_session->listener_index = app_listen_session->session_index;
  app_session->app_index = quic_main.app_index;

  // TODO: don't alloc fifos when we don't transfer data on this session
  if ((rv = app_worker_init_accepted (app_session)))
    {
      QUIC_DBG (1, "failed to allocate fifos");
      session_free (app_session);
      return rv;
    }
  ctx->c_quic_ctx_id.app_session = session_handle (app_session);
  ctx->c_quic_ctx_id.parent_app_id = lctx->c_quic_ctx_id.parent_app_id;
  ctx->c_quic_ctx_id.udp_is_ip4 = lctx->c_quic_ctx_id.udp_is_ip4;
  ctx->c_quic_ctx_id.parent_app_wrk_idx = app_session->app_wrk_index;
  session_lookup_add_connection (&ctx->connection,
				 session_handle (app_session));
  app_wrk = app_worker_get (app_session->app_wrk_index);
  rv = app_worker_accept_notify (app_wrk, app_session);
  if (rv)
    {
      QUIC_DBG (1, "failed to notify accept worker app");
      return rv;
    }
  return 0;
}

static int
quic_create_connection (quicly_context_t * quicly_ctx,
			u64 quic_session_handle, u32 lctx_index,
			quicly_conn_t * conn, struct sockaddr *sa,
			socklen_t salen, quicly_decoded_packet_t packet)
{
  quic_ctx_t *ctx;
  u32 ctx_index;

  /* new connection, accept and create context if packet is valid */
  // TODO: check if socket is actually listening?
  QUIC_DBG (2, "New connection created");
  if (quicly_accept (&conn, quicly_ctx, sa, salen,
		     &packet, ptls_iovec_init (NULL, 0),
		     &quic_main.next_cid, NULL) != 0)
    {
      // Invalid packet, pass
      assert (conn == NULL);
      QUIC_DBG (2, "Accept failed");
      return 0;
    }
  assert (conn != NULL);

  ++quic_main.next_cid.master_id;
  // Create context
  ctx_index = quic_ctx_alloc ();
  ctx = quic_ctx_get (ctx_index);
  // Save ctx handle in quicly connection
  *quicly_get_data (conn) = (void *) (u64) ctx_index;

  ctx->c_thread_index = vlib_get_thread_index ();
  ctx->c_c_index = ctx_index;
  ctx->c_quic_ctx_id.quic_session = quic_session_handle;
  ctx->c_quic_ctx_id.listener_ctx_id = lctx_index;
  ctx->c_quic_ctx_id.timer_handle = QUIC_TIMER_HANDLE_INVALID;
  ctx->c_quic_ctx_id.conn = conn;

  session_send_rpc_evt_to_thread_force (vlib_get_thread_index (),
					&quic_delayed_create_app_session,
					(void *) (u64) ctx_index);
  if (quic_send_packets (ctx))
    {
      quic_connection_closed (ctx_index);
    }
  return 0;
}

static int
quic_reset_connection (quicly_context_t * quicly_ctx, u64 quic_session_handle,
		       struct sockaddr *sa, socklen_t salen,
		       quicly_decoded_packet_t packet)
{
  /* short header packet; potentially a dead connection. No need to check the length of the incoming packet,
   * because loop is prevented by authenticating the CID (by checking node_id and thread_id). If the peer is also
   * sending a reset, then the next CID is highly likely to contain a non-authenticating CID, ... */
  QUIC_DBG (2, "Sending stateless reset");
  quicly_datagram_t *dgram;
  session_t *quic_session;
  if (packet.cid.dest.plaintext.node_id == 0
      && packet.cid.dest.plaintext.thread_id == 0)
    {
      dgram = quicly_send_stateless_reset (quicly_ctx, sa, salen,
					   &packet.cid.dest.plaintext);
      quic_session = session_get_from_handle (quic_session_handle);
      if (quic_send_datagram (quic_session, dgram))	// TODO : missing event on fifo
	QUIC_DBG (2, "Send reset failed");
    }
  return 0;
}

int
quic_app_rx_callback (session_t * quic_session)
{
  // Read data from UDP rx_fifo and pass it to the quicly conn.
  QUIC_DBG (2, "Called quic_app_rx_callback");

  quicly_decoded_packet_t packet;
  session_dgram_hdr_t ph;
  application_t *app;
  quicly_conn_t *conn = NULL;
  quic_ctx_t *lctx, *ctx = NULL;
  svm_fifo_t *f;
  size_t plen;
  struct sockaddr_in6 sa6;
  struct sockaddr *sa = (struct sockaddr *) &sa6;
  socklen_t salen;
  u32 max_deq, len;
  u8 *data;
  u32 lctx_index = quic_session->opaque;
  u64 quic_session_handle = session_handle (quic_session);

  f = quic_session->rx_fifo;

  do
    {
      conn = NULL;
      max_deq = svm_fifo_max_dequeue (f);
      if (max_deq < sizeof (session_dgram_hdr_t))
	{
	  svm_fifo_unset_event (f);
	  return 0;
	}
      QUIC_DBG (2, "Processing one packet at %ld", quic_get_time (NULL));

      svm_fifo_unset_event (f);
      svm_fifo_peek (f, 0, sizeof (ph), (u8 *) & ph);
      ASSERT (ph.data_length >= ph.data_offset);
      len = ph.data_length - ph.data_offset;

      quic_build_sockaddr (sa, &salen, &ph.rmt_ip, ph.rmt_port, ph.is_ip4);

      // Quicly can read len bytes from the fifo at offset:
      // ph.data_offset + SESSION_CONN_HDR_LEN
      data = svm_fifo_head (f) + ph.data_offset + SESSION_CONN_HDR_LEN;

      lctx = quic_ctx_get (lctx_index);
      app = application_get (lctx->c_quic_ctx_id.parent_app_id);

      plen =
	quicly_decode_packet ((quicly_context_t *) app->quicly_ctx, &packet,
			      data, len);
      if (plen != SIZE_MAX)
	{
	  quic_find_packet_ctx (&ctx, &conn, sa, salen, packet);
	  if (conn != NULL)
	    quic_receive (ctx, conn, packet);
	  else if (QUICLY_PACKET_IS_LONG_HEADER (packet.octets.base[0]))
	    quic_create_connection ((quicly_context_t *) app->quicly_ctx,
				    quic_session_handle, lctx_index, conn,
				    sa, salen, packet);
	  else if (((quicly_context_t *) app->quicly_ctx)->encrypt_cid)
	    quic_reset_connection ((quicly_context_t *) app->quicly_ctx,
				   quic_session_handle, sa, salen, packet);
	}
      svm_fifo_dequeue_drop (f,
			     ph.data_length + ph.data_offset +
			     SESSION_CONN_HDR_LEN);
    }
  while (1);
  return 0;
}

/*****************************************************************************
 * END TRANSPORT PROTO FUNCTIONS
*****************************************************************************/

/* *INDENT-OFF* */
static session_cb_vft_t quic_app_cb_vft = {
  .session_accept_callback = NULL,
  .session_disconnect_callback = quic_session_disconnect_callback,
  .session_connected_callback = quic_session_connected_callback,
  .session_reset_callback = quic_session_reset_callback,
  .add_segment_callback = quic_add_segment_callback,
  .del_segment_callback = quic_del_segment_callback,
  .builtin_app_rx_callback = quic_app_rx_callback,
};

const static transport_proto_vft_t quic_proto = {
  .connect = quic_connect,
  .close = quic_disconnect,
  .start_listen = quic_start_listen,
  .stop_listen = quic_stop_listen,
  .get_connection = quic_connection_get,
  .get_listener = quic_listener_get,
  .update_time = quic_update_time,
  .custom_tx = quic_custom_tx_callback,
  .tx_type = TRANSPORT_TX_INTERNAL,
  .service_type = TRANSPORT_SERVICE_APP,
  .format_connection = format_quic_connection,
  .format_half_open = format_quic_half_open,
  .format_listener = format_quic_listener,
};
/* *INDENT-ON* */

static clib_error_t *
quic_init (vlib_main_t * vm)
{
  QUIC_DBG (2, "Called quic_init");
  vlib_thread_main_t *vtm = vlib_get_thread_main ();
  vnet_app_attach_args_t _a, *a = &_a;
  u64 options[APP_OPTIONS_N_OPTIONS];
  u32 segment_size = 512 << 20;
  quic_main_t *qm = &quic_main;
  u32 fifo_size = 64 << 10;
  u32 num_threads;

  num_threads = 1 /* main thread */  + vtm->n_threads;

  memset (a, 0, sizeof (*a));
  memset (options, 0, sizeof (options));

  a->session_cb_vft = &quic_app_cb_vft;
  a->api_client_index = APP_INVALID_INDEX;
  a->options = options;
  a->name = format (0, "quic");
  a->options[APP_OPTIONS_SEGMENT_SIZE] = segment_size;
  a->options[APP_OPTIONS_RX_FIFO_SIZE] = fifo_size;
  a->options[APP_OPTIONS_TX_FIFO_SIZE] = fifo_size;
  a->options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_IS_BUILTIN;
  a->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE;
  a->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_IS_TRANSPORT_APP;

  if (vnet_application_attach (a))
    {
      clib_warning ("failed to attach quic app");
      return clib_error_return (0, "failed to attach quic app");
    }

  vec_validate (qm->ctx_pool, num_threads - 1);
  vec_validate (qm->wrk_ctx, num_threads - 1);
  // Timers, one per thread.
  tw_timer_wheel_1t_3w_1024sl_ov_t *tw;
  /* *INDENT-OFF* */
  foreach_vlib_main (({
    tw = &qm->wrk_ctx[ii].timer_wheel;
    tw_timer_wheel_init_1t_3w_1024sl_ov (tw, quic_expired_timers_dispatch,
                                         10e-3 /* timer period 1ms */ , ~0);
    tw->last_run_time = vlib_time_now (this_vlib_main);
  }));
  /* *INDENT-ON* */

  if (!qm->ca_cert_path)
    qm->ca_cert_path = QUIC_DEFAULT_CA_CERT_PATH;

  qm->app_index = a->app_index;
  clib_rwlock_init (&qm->half_open_rwlock);
  qm->tstamp_ticks_per_clock = vm->clib_time.seconds_per_clock
    / QUIC_TSTAMP_RESOLUTION;

  transport_register_protocol (TRANSPORT_PROTO_QUIC, &quic_proto,
			       FIB_PROTOCOL_IP4, ~0);
  transport_register_protocol (TRANSPORT_PROTO_QUIC, &quic_proto,
			       FIB_PROTOCOL_IP6, ~0);

  vec_free (a->name);
  return 0;
}

quic_main_t *
vnet_quic_get_main (void)
{
  return &quic_main;
}

VLIB_INIT_FUNCTION (quic_init);

/* *INDENT-OFF* */
VLIB_PLUGIN_REGISTER () =
{
  .version = VPP_BUILD_VER,
  .description = "Quic transport protocol",
};
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */