aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/acl/fa_node.c
blob: d29576a4bce5753360ed311a31d208212b1e8e9c (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
1591
1592
1593
1594
1595
/*
 * Copyright (c) 2016 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 <stddef.h>
#include <netinet/in.h>

#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vppinfra/error.h>


#include <acl/acl.h>
#include <vnet/ip/icmp46_packet.h>

#include <plugins/acl/fa_node.h>
#include <plugins/acl/acl.h>
#include <plugins/acl/lookup_context.h>
#include <plugins/acl/public_inlines.h>

#include <vppinfra/bihash_40_8.h>
#include <vppinfra/bihash_template.h>
#include <vppinfra/bihash_template.c>

typedef struct
{
  u32 next_index;
  u32 sw_if_index;
  u32 lc_index;
  u32 match_acl_in_index;
  u32 match_rule_index;
  u64 packet_info[6];
  u32 trace_bitmap;
  u8 action;
} acl_fa_trace_t;

/* ICMPv4 invert type for stateful ACL */
static const u8 icmp4_invmap[] = {
  [ICMP4_echo_reply] = ICMP4_echo_request + 1,
  [ICMP4_timestamp_reply] = ICMP4_timestamp_request + 1,
  [ICMP4_information_reply] = ICMP4_information_request + 1,
  [ICMP4_address_mask_reply] = ICMP4_address_mask_request + 1
};

/* Supported ICMPv4 messages for session creation */
static const u8 icmp4_valid_new[] = {
  [ICMP4_echo_request] = 1,
  [ICMP4_timestamp_request] = 1,
  [ICMP4_information_request] = 1,
  [ICMP4_address_mask_request] = 1
};

/* ICMPv6 invert type for stateful ACL */
static const u8 icmp6_invmap[] = {
  [ICMP6_echo_reply - 128]   = ICMP6_echo_request + 1,
  [ICMP6_node_information_response - 128] = ICMP6_node_information_request + 1
};

/* Supported ICMPv6 messages for session creation */
static const u8 icmp6_valid_new[] = {
  [ICMP6_echo_request - 128] = 1,
  [ICMP6_node_information_request - 128] = 1
};

/* IP4 and IP6 protocol numbers of ICMP */
static u8 icmp_protos[] = { IP_PROTOCOL_ICMP, IP_PROTOCOL_ICMP6 };

static u8 *
format_fa_5tuple (u8 * s, va_list * args)
{
  fa_5tuple_t *p5t = va_arg (*args, fa_5tuple_t *);

  return format(s, "lc_index %d (lsb16 of sw_if_index %d) l3 %s%s %U -> %U"
                   " l4 proto %d l4_valid %d port %d -> %d tcp flags (%s) %02x rsvd %x",
                p5t->pkt.lc_index, p5t->l4.lsb_of_sw_if_index, p5t->pkt.is_ip6 ? "ip6" : "ip4",
                p5t->pkt.is_nonfirst_fragment ? " non-initial fragment" : "",
                format_ip46_address, &p5t->addr[0], p5t->pkt.is_ip6 ? IP46_TYPE_IP6 : IP46_TYPE_IP4,
                format_ip46_address, &p5t->addr[1], p5t->pkt.is_ip6 ? IP46_TYPE_IP6 : IP46_TYPE_IP4,
                p5t->l4.proto, p5t->pkt.l4_valid,
                p5t->l4.port[0], p5t->l4.port[1],
                p5t->pkt.tcp_flags_valid ? "valid": "invalid",
                p5t->pkt.tcp_flags,
                p5t->pkt.flags_reserved);
}

u8 *
format_acl_plugin_5tuple (u8 * s, va_list * args)
{
  return format_fa_5tuple(s, args);
}

/* packet trace format function */
static u8 *
format_acl_fa_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  acl_fa_trace_t *t = va_arg (*args, acl_fa_trace_t *);

  s =
    format (s,
	    "acl-plugin: lc_index: %d, sw_if_index %d, next index %d, action: %d, match: acl %d rule %d trace_bits %08x\n"
	    "  pkt info %016llx %016llx %016llx %016llx %016llx %016llx",
	    t->lc_index, t->sw_if_index, t->next_index, t->action, t->match_acl_in_index,
	    t->match_rule_index, t->trace_bitmap,
	    t->packet_info[0], t->packet_info[1], t->packet_info[2],
	    t->packet_info[3], t->packet_info[4], t->packet_info[5]);

  /* Now also print out the packet_info in a form usable by humans */
  s = format (s, "\n   %U", format_fa_5tuple, t->packet_info);
  return s;
}

/* *INDENT-OFF* */
#define foreach_acl_fa_error \
_(ACL_DROP, "ACL deny packets")  \
_(ACL_PERMIT, "ACL permit packets")  \
_(ACL_NEW_SESSION, "new sessions added") \
_(ACL_EXIST_SESSION, "existing session packets") \
_(ACL_CHECK, "checked packets") \
_(ACL_RESTART_SESSION_TIMER, "restart session timer") \
_(ACL_TOO_MANY_SESSIONS, "too many sessions to add new") \
/* end  of errors */

typedef enum
{
#define _(sym,str) ACL_FA_ERROR_##sym,
  foreach_acl_fa_error
#undef _
    ACL_FA_N_ERROR,
} acl_fa_error_t;

static char *acl_fa_error_strings[] = {
#define _(sym,string) string,
  foreach_acl_fa_error
#undef _
};
/* *INDENT-ON* */

static int
acl_fa_ifc_has_sessions (acl_main_t * am, int sw_if_index0)
{
  return am->fa_sessions_hash_is_initialized;
}

static int
acl_fa_ifc_has_in_acl (acl_main_t * am, int sw_if_index0)
{
  int it_has = clib_bitmap_get (am->fa_in_acl_on_sw_if_index, sw_if_index0);
  return it_has;
}

static int
acl_fa_ifc_has_out_acl (acl_main_t * am, int sw_if_index0)
{
  int it_has = clib_bitmap_get (am->fa_out_acl_on_sw_if_index, sw_if_index0);
  return it_has;
}

/* Session keys match the packets received, and mirror the packets sent */
static u32
acl_make_5tuple_session_key (acl_main_t * am, int is_input, int is_ip6,
                             u32 sw_if_index, fa_5tuple_t * p5tuple_pkt,
                             fa_5tuple_t * p5tuple_sess)
{
  int src_index = is_input ? 0 : 1;
  int dst_index = is_input ? 1 : 0;
  u32 valid_new_sess = 1;
  p5tuple_sess->addr[src_index] = p5tuple_pkt->addr[0];
  p5tuple_sess->addr[dst_index] = p5tuple_pkt->addr[1];
  p5tuple_sess->l4.as_u64 = p5tuple_pkt->l4.as_u64;

  if (PREDICT_TRUE(p5tuple_pkt->l4.proto != icmp_protos[is_ip6]))
    {
      p5tuple_sess->l4.port[src_index] = p5tuple_pkt->l4.port[0];
      p5tuple_sess->l4.port[dst_index] = p5tuple_pkt->l4.port[1];
    }
  else
    {
      static const u8 * icmp_invmap[] = { icmp4_invmap, icmp6_invmap };
      static const u8 * icmp_valid_new[] = { icmp4_valid_new, icmp6_valid_new };
      static const u8 icmp_invmap_size[] = { sizeof(icmp4_invmap),
                                             sizeof(icmp6_invmap) };
      static const u8 icmp_valid_new_size[] = { sizeof(icmp4_valid_new),
                                                sizeof(icmp6_valid_new) };
      int type = is_ip6 ? p5tuple_pkt->l4.port[0]-128: p5tuple_pkt->l4.port[0];

      p5tuple_sess->l4.port[0] = p5tuple_pkt->l4.port[0];
      p5tuple_sess->l4.port[1] = p5tuple_pkt->l4.port[1];

      /*
       * Invert ICMP type for valid icmp_invmap messages:
       *  1) input node with outbound ACL interface
       *  2) output node with inbound ACL interface
       *
       */
      if ((is_input && acl_fa_ifc_has_out_acl(am, sw_if_index)) ||
          (!is_input && acl_fa_ifc_has_in_acl(am, sw_if_index)))
        {
          if (type >= 0 &&
              type <= icmp_invmap_size[is_ip6] &&
              icmp_invmap[is_ip6][type])
            {
              p5tuple_sess->l4.port[0] = icmp_invmap[is_ip6][type] - 1;
            }
        }

      /*
       * ONLY ICMP messages defined in icmp4_valid_new/icmp6_valid_new table
       * are allowed to create stateful ACL.
       * The other messages will be forwarded without creating a reflexive ACL.
       */
      if (type < 0 ||
          type > icmp_valid_new_size[is_ip6] ||
          !icmp_valid_new[is_ip6][type])
        {
          valid_new_sess = 0;
        }
    }

    return valid_new_sess;
}


static int
fa_session_get_timeout_type (acl_main_t * am, fa_session_t * sess)
{
  /* seen both SYNs and ACKs but not FINs means we are in establshed state */
  u16 masked_flags =
    sess->tcp_flags_seen.as_u16 & ((TCP_FLAGS_RSTFINACKSYN << 8) +
				   TCP_FLAGS_RSTFINACKSYN);
  switch (sess->info.l4.proto)
    {
    case IPPROTO_TCP:
      if (((TCP_FLAGS_ACKSYN << 8) + TCP_FLAGS_ACKSYN) == masked_flags)
	{
	  return ACL_TIMEOUT_TCP_IDLE;
	}
      else
	{
	  return ACL_TIMEOUT_TCP_TRANSIENT;
	}
      break;
    case IPPROTO_UDP:
      return ACL_TIMEOUT_UDP_IDLE;
      break;
    default:
      return ACL_TIMEOUT_UDP_IDLE;
    }
}


static u64
fa_session_get_shortest_timeout(acl_main_t * am)
{
  int timeout_type;
  u64 timeout = ~0LL;
  for(timeout_type = 0; timeout_type < ACL_N_TIMEOUTS; timeout_type++) {
    if (timeout > am->session_timeout_sec[timeout_type]) {
      timeout = am->session_timeout_sec[timeout_type];
    }
  }
  return timeout;
}

/*
 * Get the timeout of the session in a list since its enqueue time.
 */

static u64
fa_session_get_list_timeout (acl_main_t * am, fa_session_t * sess)
{
  u64 timeout = am->vlib_main->clib_time.clocks_per_second;
  /*
   * we have the shortest possible timeout type in all the lists
   * (see README-multicore for the rationale)
   */
  timeout *= fa_session_get_shortest_timeout(am);
  return timeout;
}

/*
 * Get the idle timeout of a session.
 */

static u64
fa_session_get_timeout (acl_main_t * am, fa_session_t * sess)
{
  u64 timeout = am->vlib_main->clib_time.clocks_per_second;
  int timeout_type = fa_session_get_timeout_type (am, sess);
  timeout *= am->session_timeout_sec[timeout_type];
  return timeout;
}

static void
acl_fa_verify_init_sessions (acl_main_t * am)
{
  if (!am->fa_sessions_hash_is_initialized) {
    u16 wk;
    /* Allocate the per-worker sessions pools */
    for (wk = 0; wk < vec_len (am->per_worker_data); wk++) {
      acl_fa_per_worker_data_t *pw = &am->per_worker_data[wk];

      /*
      * // In lieu of trying to preallocate the pool and its free bitmap, rather use pool_init_fixed
      * pool_alloc_aligned(pw->fa_sessions_pool, am->fa_conn_table_max_entries, CLIB_CACHE_LINE_BYTES);
      * clib_bitmap_validate(pool_header(pw->fa_sessions_pool)->free_bitmap, am->fa_conn_table_max_entries);
      */
      pool_init_fixed(pw->fa_sessions_pool, am->fa_conn_table_max_entries);
    }

    /* ... and the interface session hash table */
    BV (clib_bihash_init) (&am->fa_sessions_hash,
			 "ACL plugin FA session bihash",
			 am->fa_conn_table_hash_num_buckets,
			 am->fa_conn_table_hash_memory_size);
    am->fa_sessions_hash_is_initialized = 1;
  }
}

static inline fa_session_t *get_session_ptr(acl_main_t *am, u16 thread_index, u32 session_index)
{
  acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
  fa_session_t *sess = pool_is_free_index (pw->fa_sessions_pool, session_index) ? 0 : pool_elt_at_index(pw->fa_sessions_pool, session_index);
  return sess;
}

static inline int is_valid_session_ptr(acl_main_t *am, u16 thread_index, fa_session_t *sess)
{
  acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
  return ((sess != 0) && ((sess - pw->fa_sessions_pool) < pool_len(pw->fa_sessions_pool)));
}

static void
acl_fa_conn_list_add_session (acl_main_t * am, fa_full_session_id_t sess_id, u64 now)
{
  fa_session_t *sess = get_session_ptr(am, sess_id.thread_index, sess_id.session_index);
  u8 list_id = fa_session_get_timeout_type(am, sess);
  uword thread_index = os_get_thread_index ();
  acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
  /* the retrieved session thread index must be necessarily the same as the one in the key */
  ASSERT (sess->thread_index == sess_id.thread_index);
  /* the retrieved session thread index must be the same as current thread */
  ASSERT (sess->thread_index == thread_index);
  sess->link_enqueue_time = now;
  sess->link_list_id = list_id;
  sess->link_next_idx = ~0;
  sess->link_prev_idx = pw->fa_conn_list_tail[list_id];
  if (~0 != pw->fa_conn_list_tail[list_id]) {
    fa_session_t *prev_sess = get_session_ptr(am, thread_index, pw->fa_conn_list_tail[list_id]);
    prev_sess->link_next_idx = sess_id.session_index;
    /* We should never try to link with a session on another thread */
    ASSERT(prev_sess->thread_index == sess->thread_index);
  }
  pw->fa_conn_list_tail[list_id] = sess_id.session_index;
  
#ifdef FA_NODE_VERBOSE_DEBUG
    clib_warning("FA-SESSION-DEBUG: add session id %d on thread %d sw_if_index %d", sess_id.session_index, thread_index, sess->sw_if_index);
#endif
  pw->serviced_sw_if_index_bitmap = clib_bitmap_set(pw->serviced_sw_if_index_bitmap, sess->sw_if_index, 1);

  if (~0 == pw->fa_conn_list_head[list_id]) {
    pw->fa_conn_list_head[list_id] = sess_id.session_index;
  }
}

static int
acl_fa_conn_list_delete_session (acl_main_t *am, fa_full_session_id_t sess_id)
{
  uword thread_index = os_get_thread_index ();
  acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
  if (thread_index != sess_id.thread_index) {
    /* If another thread attempts to delete the session, fail it. */
#ifdef FA_NODE_VERBOSE_DEBUG
    clib_warning("thread id in key %d != curr thread index, not deleting");
#endif
    return 0;
  }
  fa_session_t *sess = get_session_ptr(am, sess_id.thread_index, sess_id.session_index);
  /* we should never try to delete the session with another thread index */
  ASSERT(sess->thread_index == thread_index);
  if (~0 != sess->link_prev_idx) {
    fa_session_t *prev_sess = get_session_ptr(am, thread_index, sess->link_prev_idx);
    /* the previous session must be in the same list as this one */
    ASSERT(prev_sess->link_list_id == sess->link_list_id);
    prev_sess->link_next_idx = sess->link_next_idx;
  }
  if (~0 != sess->link_next_idx) {
    fa_session_t *next_sess = get_session_ptr(am, thread_index, sess->link_next_idx);
    /* The next session must be in the same list as the one we are deleting */
    ASSERT(next_sess->link_list_id == sess->link_list_id);
    next_sess->link_prev_idx = sess->link_prev_idx;
  }
  if (pw->fa_conn_list_head[sess->link_list_id] == sess_id.session_index) {
    pw->fa_conn_list_head[sess->link_list_id] = sess->link_next_idx;
  }
  if (pw->fa_conn_list_tail[sess->link_list_id] == sess_id.session_index) {
    pw->fa_conn_list_tail[sess->link_list_id] = sess->link_prev_idx;
  }
  return 1;
}

static int
acl_fa_restart_timer_for_session (acl_main_t * am, u64 now, fa_full_session_id_t sess_id)
{
  if (acl_fa_conn_list_delete_session(am, sess_id)) {
    acl_fa_conn_list_add_session(am, sess_id, now);
    return 1;
  } else {
    /*
     * Our thread does not own this connection, so we can not delete
     * The session. To avoid the complicated signaling, we simply
     * pick the list waiting time to be the shortest of the timeouts.
     * This way we do not have to do anything special, and let
     * the regular requeue check take care of everything.
     */
    return 0;
  }
}


static u8
acl_fa_track_session (acl_main_t * am, int is_input, u32 sw_if_index, u64 now,
		      fa_session_t * sess, fa_5tuple_t * pkt_5tuple)
{
  sess->last_active_time = now;
  if (pkt_5tuple->pkt.tcp_flags_valid)
    {
      sess->tcp_flags_seen.as_u8[is_input] |= pkt_5tuple->pkt.tcp_flags;
    }
  return 3;
}


static void
acl_fa_delete_session (acl_main_t * am, u32 sw_if_index, fa_full_session_id_t sess_id)
{
  void *oldheap = clib_mem_set_heap(am->acl_mheap);
  fa_session_t *sess = get_session_ptr(am, sess_id.thread_index, sess_id.session_index);
  ASSERT(sess->thread_index == os_get_thread_index ());
  BV (clib_bihash_add_del) (&am->fa_sessions_hash,
			    &sess->info.kv, 0);
  acl_fa_per_worker_data_t *pw = &am->per_worker_data[sess_id.thread_index];
  pool_put_index (pw->fa_sessions_pool, sess_id.session_index);
  /* Deleting from timer structures not needed,
     as the caller must have dealt with the timers. */
  vec_validate (pw->fa_session_dels_by_sw_if_index, sw_if_index);
  clib_mem_set_heap (oldheap);
  pw->fa_session_dels_by_sw_if_index[sw_if_index]++;
  clib_smp_atomic_add(&am->fa_session_total_dels, 1);
}

static int
acl_fa_can_add_session (acl_main_t * am, int is_input, u32 sw_if_index)
{
  u64 curr_sess_count;
  curr_sess_count = am->fa_session_total_adds - am->fa_session_total_dels;
  return (curr_sess_count < am->fa_conn_table_max_entries);
}

static u64
acl_fa_get_list_head_expiry_time(acl_main_t *am, acl_fa_per_worker_data_t *pw, u64 now, u16 thread_index, int timeout_type)
{
  fa_session_t *sess = get_session_ptr(am, thread_index, pw->fa_conn_list_head[timeout_type]);
  /*
   * We can not check just the index here because inbetween the worker thread might
   * dequeue the connection from the head just as we are about to check it.
   */
  if (!is_valid_session_ptr(am, thread_index, sess)) {
    return ~0LL; // infinity.
  } else {
    u64 timeout_time =
              sess->link_enqueue_time + fa_session_get_list_timeout (am, sess);
    return timeout_time;
  }
}

static int
acl_fa_conn_time_to_check (acl_main_t *am, acl_fa_per_worker_data_t *pw, u64 now, u16 thread_index, u32 session_index)
{
  fa_session_t *sess = get_session_ptr(am, thread_index, session_index);
  u64 timeout_time =
              sess->link_enqueue_time + fa_session_get_list_timeout (am, sess);
  return (timeout_time < now) || (sess->link_enqueue_time <= pw->swipe_end_time);
}

/*
 * see if there are sessions ready to be checked,
 * do the maintenance (requeue or delete), and
 * return the total number of sessions reclaimed.
 */
static int
acl_fa_check_idle_sessions(acl_main_t *am, u16 thread_index, u64 now)
{
  acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
  fa_full_session_id_t fsid;
  fsid.thread_index = thread_index;
  int total_expired = 0;

  {
    u8 tt = 0;
    for(tt = 0; tt < ACL_N_TIMEOUTS; tt++) {
      while((vec_len(pw->expired) < am->fa_max_deleted_sessions_per_interval)
	    && (~0 != pw->fa_conn_list_head[tt])
	    && (acl_fa_conn_time_to_check(am, pw, now, thread_index,
					  pw->fa_conn_list_head[tt]))) {
	fsid.session_index = pw->fa_conn_list_head[tt];
        elog_acl_maybe_trace_X2(am, "acl_fa_check_idle_sessions: expire session %d on thread %d", "i4i4", (u32)fsid.session_index, (u32)thread_index);
	vec_add1(pw->expired, fsid.session_index);
	acl_fa_conn_list_delete_session(am, fsid);
      }
    }
  }

  u32 *psid = NULL;
  vec_foreach (psid, pw->expired)
  {
    fsid.session_index = *psid;
    if (!pool_is_free_index (pw->fa_sessions_pool, fsid.session_index))
      {
	fa_session_t *sess = get_session_ptr(am, thread_index, fsid.session_index);
	u32 sw_if_index = sess->sw_if_index;
	u64 sess_timeout_time =
	  sess->last_active_time + fa_session_get_timeout (am, sess);
	if ((now < sess_timeout_time) && (0 == clib_bitmap_get(pw->pending_clear_sw_if_index_bitmap, sw_if_index)))
	  {
#ifdef FA_NODE_VERBOSE_DEBUG
	    clib_warning ("ACL_FA_NODE_CLEAN: Restarting timer for session %d, sw_if_index %d",
	       (int) fsid.session_index, sess->sw_if_index);
#endif
	    /* There was activity on the session, so the idle timeout
	       has not passed. Enqueue for another time period. */

	    acl_fa_conn_list_add_session(am, fsid, now);
	    pw->cnt_session_timer_restarted++;
	  }
	else
	  {
#ifdef FA_NODE_VERBOSE_DEBUG
	    clib_warning ("ACL_FA_NODE_CLEAN: Deleting session %d, sw_if_index %d",
	       (int) fsid.session_index, sess->sw_if_index);
#endif
	    acl_fa_delete_session (am, sw_if_index, fsid);
	    pw->cnt_deleted_sessions++;
	  }
      }
    else
      {
	pw->cnt_already_deleted_sessions++;
      }
  }
  total_expired = vec_len(pw->expired);
  /* zero out the vector which we have acted on */
  if (pw->expired)
    _vec_len (pw->expired) = 0;
  /* if we were advancing and reached the end
   * (no more sessions to recycle), reset the fast-forward timestamp */

  if (pw->swipe_end_time && 0 == total_expired)
    pw->swipe_end_time = 0;
  return (total_expired);
}

always_inline void
acl_fa_try_recycle_session (acl_main_t * am, int is_input, u16 thread_index, u32 sw_if_index)
{
  /* try to recycle a TCP transient session */
  acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
  u8 timeout_type = ACL_TIMEOUT_TCP_TRANSIENT;
  fa_full_session_id_t sess_id;
  sess_id.session_index = pw->fa_conn_list_head[timeout_type];
  if (~0 != sess_id.session_index) {
    sess_id.thread_index = thread_index;
    acl_fa_conn_list_delete_session(am, sess_id);
    acl_fa_delete_session(am, sw_if_index, sess_id);
  }
}

static fa_session_t *
acl_fa_add_session (acl_main_t * am, int is_input, u32 sw_if_index, u64 now,
		    fa_5tuple_t * p5tuple)
{
  clib_bihash_kv_40_8_t *pkv = &p5tuple->kv;
  clib_bihash_kv_40_8_t kv;
  fa_full_session_id_t f_sess_id;
  uword thread_index = os_get_thread_index();
  void *oldheap = clib_mem_set_heap(am->acl_mheap);
  acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];

  f_sess_id.thread_index = thread_index;
  fa_session_t *sess;

  pool_get_aligned (pw->fa_sessions_pool, sess, CLIB_CACHE_LINE_BYTES);
  f_sess_id.session_index = sess - pw->fa_sessions_pool;

  kv.key[0] = pkv->key[0];
  kv.key[1] = pkv->key[1];
  kv.key[2] = pkv->key[2];
  kv.key[3] = pkv->key[3];
  kv.key[4] = pkv->key[4];
  kv.value = f_sess_id.as_u64;

  memcpy (sess, pkv, sizeof (pkv->key));
  sess->last_active_time = now;
  sess->sw_if_index = sw_if_index;
  sess->tcp_flags_seen.as_u16 = 0;
  sess->thread_index = thread_index;
  sess->link_list_id = ~0;
  sess->link_prev_idx = ~0;
  sess->link_next_idx = ~0;



  ASSERT(am->fa_sessions_hash_is_initialized == 1);
  BV (clib_bihash_add_del) (&am->fa_sessions_hash,
			    &kv, 1);
  acl_fa_conn_list_add_session(am, f_sess_id, now);

  vec_validate (pw->fa_session_adds_by_sw_if_index, sw_if_index);
  clib_mem_set_heap (oldheap);
  pw->fa_session_adds_by_sw_if_index[sw_if_index]++;
  clib_smp_atomic_add(&am->fa_session_total_adds, 1);
  return sess;
}

static int
acl_fa_find_session (acl_main_t * am, u32 sw_if_index0, fa_5tuple_t * p5tuple,
		     clib_bihash_kv_40_8_t * pvalue_sess)
{
  return (clib_bihash_search_40_8 (&am->fa_sessions_hash, &p5tuple->kv, pvalue_sess) == 0);
}


always_inline uword
acl_fa_node_fn (vlib_main_t * vm,
		vlib_node_runtime_t * node, vlib_frame_t * frame, int is_ip6,
		int is_input, int is_l2_path, u32 * l2_feat_next_node_index,
		vlib_node_registration_t * acl_fa_node)
{
  u32 n_left_from, *from, *to_next;
  acl_fa_next_t next_index;
  u32 pkts_acl_checked = 0;
  u32 pkts_new_session = 0;
  u32 pkts_exist_session = 0;
  u32 pkts_acl_permit = 0;
  u32 pkts_restart_session_timer = 0;
  u32 trace_bitmap = 0;
  acl_main_t *am = &acl_main;
  fa_5tuple_t fa_5tuple, kv_sess;
  clib_bihash_kv_40_8_t value_sess;
  vlib_node_runtime_t *error_node;
  u64 now = clib_cpu_time_now ();
  uword thread_index = os_get_thread_index ();

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  error_node = vlib_node_get_runtime (vm, acl_fa_node->index);

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0;
	  vlib_buffer_t *b0;
	  u32 next0 = 0;
	  u8 action = 0;
	  u32 sw_if_index0;
	  u32 lc_index0;
	  int acl_check_needed = 1;
	  u32 match_acl_in_index = ~0;
	  u32 match_acl_pos = ~0;
	  u32 match_rule_index = ~0;
	  u8 error0 = 0;
	  u32 valid_new_sess;

	  /* speculatively enqueue b0 to the current next frame */
	  bi0 = from[0];
	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);

	  if (is_input)
	    sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	  else
	    sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];

	  if (is_input)
	    lc_index0 = am->input_lc_index_by_sw_if_index[sw_if_index0];
	  else
	    lc_index0 = am->output_lc_index_by_sw_if_index[sw_if_index0];
	  /*
	   * Extract the L3/L4 matching info into a 5-tuple structure,
	   * then create a session key whose layout is independent on forward or reverse
	   * direction of the packet.
	   */

	  acl_plugin_fill_5tuple_inline (lc_index0, b0, is_ip6, is_input, is_l2_path, (fa_5tuple_opaque_t *)&fa_5tuple);
          fa_5tuple.l4.lsb_of_sw_if_index = sw_if_index0 & 0xffff;
	  fa_5tuple.pkt.lc_index = lc_index0;
	  valid_new_sess = acl_make_5tuple_session_key (am, is_input, is_ip6, sw_if_index0,  &fa_5tuple, &kv_sess);
          fa_5tuple.pkt.is_ip6 = is_ip6;
          // XXDEL fa_5tuple.pkt.is_input = is_input;
          fa_5tuple.pkt.mask_type_index_lsb = ~0;
#ifdef FA_NODE_VERBOSE_DEBUG
	  clib_warning
	    ("ACL_FA_NODE_DBG: session 5-tuple %016llx %016llx %016llx %016llx %016llx %016llx",
	     kv_sess.kv.key[0], kv_sess.kv.key[1], kv_sess.kv.key[2],
	     kv_sess.kv.key[3], kv_sess.kv.key[4], kv_sess.kv.value);
	  clib_warning
	    ("ACL_FA_NODE_DBG: packet 5-tuple %016llx %016llx %016llx %016llx %016llx %016llx",
	     fa_5tuple.kv.key[0], fa_5tuple.kv.key[1], fa_5tuple.kv.key[2],
	     fa_5tuple.kv.key[3], fa_5tuple.kv.key[4], fa_5tuple.kv.value);
#endif

	  /* Try to match an existing session first */

	  if (acl_fa_ifc_has_sessions (am, sw_if_index0))
	    {
	      if (acl_fa_find_session
		  (am, sw_if_index0, &kv_sess, &value_sess))
		{
		  trace_bitmap |= 0x80000000;
		  error0 = ACL_FA_ERROR_ACL_EXIST_SESSION;
		  fa_full_session_id_t f_sess_id;

                  f_sess_id.as_u64 = value_sess.value;
                  ASSERT(f_sess_id.thread_index < vec_len(vlib_mains));

		  fa_session_t *sess = get_session_ptr(am, f_sess_id.thread_index, f_sess_id.session_index);
		  int old_timeout_type =
		    fa_session_get_timeout_type (am, sess);
		  action =
		    acl_fa_track_session (am, is_input, sw_if_index0, now,
					  sess, &fa_5tuple);
		  /* expose the session id to the tracer */
		  match_rule_index = f_sess_id.session_index;
		  int new_timeout_type =
		    fa_session_get_timeout_type (am, sess);
		  acl_check_needed = 0;
		  pkts_exist_session += 1;
		  /* Tracking might have changed the session timeout type, e.g. from transient to established */
		  if (PREDICT_FALSE (old_timeout_type != new_timeout_type))
		    {
		      acl_fa_restart_timer_for_session (am, now, f_sess_id);
		      pkts_restart_session_timer++;
		      trace_bitmap |=
			0x00010000 + ((0xff & old_timeout_type) << 8) +
			(0xff & new_timeout_type);
		    }
                  /*
                   * I estimate the likelihood to be very low - the VPP needs
                   * to have >64K interfaces to start with and then on
                   * exactly 64K indices apart needs to be exactly the same
                   * 5-tuple... Anyway, since this probability is nonzero -
                   * print an error and drop the unlucky packet.
                   * If this shows up in real world, we would need to bump
                   * the hash key length.
                   */
		  if (PREDICT_FALSE(sess->sw_if_index != sw_if_index0)) {
                    clib_warning("BUG: session LSB16(sw_if_index) and 5-tuple collision!");
                    acl_check_needed = 0;
                    action = 0;
                  }
		}
	    }

	  if (acl_check_needed)
	    {
              action = 0; /* deny by default */
	      acl_plugin_match_5tuple_inline (lc_index0, (fa_5tuple_opaque_t *)&fa_5tuple,
				       is_ip6, &action, &match_acl_pos, &match_acl_in_index,
				       &match_rule_index, &trace_bitmap);
	      error0 = action;
	      if (1 == action)
		pkts_acl_permit += 1;
	      if (2 == action)
		{
		  if (!acl_fa_can_add_session (am, is_input, sw_if_index0))
                    acl_fa_try_recycle_session (am, is_input, thread_index, sw_if_index0);

		  if (acl_fa_can_add_session (am, is_input, sw_if_index0))
		    {
                      if (PREDICT_TRUE (valid_new_sess)) {
                        fa_session_t *sess = acl_fa_add_session (am, is_input,
                                                                 sw_if_index0,
                                                                 now, &kv_sess);
                        acl_fa_track_session (am, is_input, sw_if_index0, now,
                                              sess, &fa_5tuple);
                        pkts_new_session += 1;
                      } else {
                        /*
                         *  ICMP packets with non-icmp_valid_new type will be
                         *  forwared without being dropped.
                         */
                        action = 1;
                        pkts_acl_permit += 1;
                      }
		    }
		  else
		    {
		      action = 0;
		      error0 = ACL_FA_ERROR_ACL_TOO_MANY_SESSIONS;
		    }
		}
	    }



	  if (action > 0)
	    {
	      if (is_l2_path)
		next0 = vnet_l2_feature_next (b0, l2_feat_next_node_index, 0);
	      else
		vnet_feature_next (sw_if_index0, &next0, b0);
	    }
#ifdef FA_NODE_VERBOSE_DEBUG
          clib_warning("ACL_FA_NODE_DBG: sw_if_index %d lc_index %d action %d acl_index %d rule_index %d", sw_if_index0, lc_index0, action, match_acl_in_index, match_rule_index);
#endif

	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      acl_fa_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
	      t->sw_if_index = sw_if_index0;
	      t->lc_index = lc_index0;
	      t->next_index = next0;
	      t->match_acl_in_index = match_acl_in_index;
	      t->match_rule_index = match_rule_index;
	      t->packet_info[0] = fa_5tuple.kv.key[0];
	      t->packet_info[1] = fa_5tuple.kv.key[1];
	      t->packet_info[2] = fa_5tuple.kv.key[2];
	      t->packet_info[3] = fa_5tuple.kv.key[3];
	      t->packet_info[4] = fa_5tuple.kv.key[4];
	      t->packet_info[5] = fa_5tuple.kv.value;
	      t->action = action;
	      t->trace_bitmap = trace_bitmap;
	    }

	  next0 = next0 < node->n_next_nodes ? next0 : 0;
	  if (0 == next0)
	    b0->error = error_node->errors[error0];

	  pkts_acl_checked += 1;

	  /* verify speculative enqueue, maybe switch current next frame */
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					   to_next, n_left_to_next, bi0,
					   next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  vlib_node_increment_counter (vm, acl_fa_node->index,
			       ACL_FA_ERROR_ACL_CHECK, pkts_acl_checked);
  vlib_node_increment_counter (vm, acl_fa_node->index,
			       ACL_FA_ERROR_ACL_PERMIT, pkts_acl_permit);
  vlib_node_increment_counter (vm, acl_fa_node->index,
			       ACL_FA_ERROR_ACL_NEW_SESSION,
			       pkts_new_session);
  vlib_node_increment_counter (vm, acl_fa_node->index,
			       ACL_FA_ERROR_ACL_EXIST_SESSION,
			       pkts_exist_session);
  vlib_node_increment_counter (vm, acl_fa_node->index,
			       ACL_FA_ERROR_ACL_RESTART_SESSION_TIMER,
			       pkts_restart_session_timer);
  return frame->n_vectors;
}


vlib_node_registration_t acl_in_l2_ip6_node;
static uword
acl_in_ip6_l2_node_fn (vlib_main_t * vm,
		       vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  acl_main_t *am = &acl_main;
  return acl_fa_node_fn (vm, node, frame, 1, 1, 1,
			 am->fa_acl_in_ip6_l2_node_feat_next_node_index,
			 &acl_in_l2_ip6_node);
}

vlib_node_registration_t acl_in_l2_ip4_node;
static uword
acl_in_ip4_l2_node_fn (vlib_main_t * vm,
		       vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  acl_main_t *am = &acl_main;
  return acl_fa_node_fn (vm, node, frame, 0, 1, 1,
			 am->fa_acl_in_ip4_l2_node_feat_next_node_index,
			 &acl_in_l2_ip4_node);
}

vlib_node_registration_t acl_out_l2_ip6_node;
static uword
acl_out_ip6_l2_node_fn (vlib_main_t * vm,
			vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  acl_main_t *am = &acl_main;
  return acl_fa_node_fn (vm, node, frame, 1, 0, 1,
			 am->fa_acl_out_ip6_l2_node_feat_next_node_index,
			 &acl_out_l2_ip6_node);
}

vlib_node_registration_t acl_out_l2_ip4_node;
static uword
acl_out_ip4_l2_node_fn (vlib_main_t * vm,
			vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  acl_main_t *am = &acl_main;
  return acl_fa_node_fn (vm, node, frame, 0, 0, 1,
			 am->fa_acl_out_ip4_l2_node_feat_next_node_index,
			 &acl_out_l2_ip4_node);
}


/**** L3 processing path nodes ****/


vlib_node_registration_t acl_in_fa_ip6_node;
static uword
acl_in_ip6_fa_node_fn (vlib_main_t * vm,
		       vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  return acl_fa_node_fn (vm, node, frame, 1, 1, 0, 0, &acl_in_fa_ip6_node);
}

vlib_node_registration_t acl_in_fa_ip4_node;
static uword
acl_in_ip4_fa_node_fn (vlib_main_t * vm,
		       vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  return acl_fa_node_fn (vm, node, frame, 0, 1, 0, 0, &acl_in_fa_ip4_node);
}

vlib_node_registration_t acl_out_fa_ip6_node;
static uword
acl_out_ip6_fa_node_fn (vlib_main_t * vm,
			vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  return acl_fa_node_fn (vm, node, frame, 1, 0, 0, 0, &acl_out_fa_ip6_node);
}

vlib_node_registration_t acl_out_fa_ip4_node;
static uword
acl_out_ip4_fa_node_fn (vlib_main_t * vm,
			vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  return acl_fa_node_fn (vm, node, frame, 0, 0, 0, 0, &acl_out_fa_ip4_node);
}

/*
 * This process ensures the connection cleanup happens every so often
 * even in absence of traffic, as well as provides general orchestration
 * for requests like connection deletion on a given sw_if_index.
 */


/* *INDENT-OFF* */
#define foreach_acl_fa_cleaner_error \
_(UNKNOWN_EVENT, "unknown event received")  \
/* end  of errors */

typedef enum
{
#define _(sym,str) ACL_FA_CLEANER_ERROR_##sym,
  foreach_acl_fa_cleaner_error
#undef _
    ACL_FA_CLEANER_N_ERROR,
} acl_fa_cleaner_error_t;

static char *acl_fa_cleaner_error_strings[] = {
#define _(sym,string) string,
  foreach_acl_fa_cleaner_error
#undef _
};

/* *INDENT-ON* */

static vlib_node_registration_t acl_fa_session_cleaner_process_node;
static vlib_node_registration_t acl_fa_worker_session_cleaner_process_node;

/*
 * Per-worker thread interrupt-driven cleaner thread
 * to clean idle connections if there are no packets
 */
static uword
acl_fa_worker_conn_cleaner_process(vlib_main_t * vm,
              vlib_node_runtime_t * rt, vlib_frame_t * f)
{
   acl_main_t *am = &acl_main;
   u64 now = clib_cpu_time_now ();
   u16 thread_index = os_get_thread_index ();
   acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
   int num_expired;
   elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner interrupt: now %lu", "i8", now);
   /* allow another interrupt to be queued */
   pw->interrupt_is_pending = 0;
   if (pw->clear_in_process) {
     if (0 == pw->swipe_end_time) {
       /*
        * Someone has just set the flag to start clearing.
        * we do this by combing through the connections up to a "time T"
        * which is now, and requeueing everything except the expired
        * connections and those matching the interface(s) being cleared.
        */

       /*
        * first filter the sw_if_index bitmap that they want from us, by
        * a bitmap of sw_if_index for which we actually have connections.
        */
       if ((pw->pending_clear_sw_if_index_bitmap == 0)
           || (pw->serviced_sw_if_index_bitmap == 0)) {
         elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: now %lu, someone tried to call clear but one of the bitmaps are empty", "i8", now);
	 clib_bitmap_zero(pw->pending_clear_sw_if_index_bitmap);
       } else {
#ifdef FA_NODE_VERBOSE_DEBUG
         clib_warning("WORKER-CLEAR: (before and) swiping sw-if-index bitmap: %U, my serviced bitmap %U",
                      format_bitmap_hex, pw->pending_clear_sw_if_index_bitmap,
                      format_bitmap_hex, pw->serviced_sw_if_index_bitmap);
#endif
         pw->pending_clear_sw_if_index_bitmap = clib_bitmap_and(pw->pending_clear_sw_if_index_bitmap,
							      pw->serviced_sw_if_index_bitmap);
       }

       if (clib_bitmap_is_zero(pw->pending_clear_sw_if_index_bitmap)) {
         /* if the cross-section is a zero vector, no need to do anything. */
         elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: now %lu, clearing done, nothing to do", "i8", now);
         pw->clear_in_process = 0;
       } else {
#ifdef FA_NODE_VERBOSE_DEBUG
         clib_warning("WORKER-CLEAR: swiping sw-if-index bitmap: %U, my serviced bitmap %U",
                      format_bitmap_hex, pw->pending_clear_sw_if_index_bitmap,
                      format_bitmap_hex, pw->serviced_sw_if_index_bitmap);
#endif
         elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: swiping until %lu", "i8", now);
         /* swipe through the connection lists until enqueue timestamps become above "now" */
         pw->swipe_end_time = now;
       }
     }
   }
   num_expired = acl_fa_check_idle_sessions(am, thread_index, now);
   // clib_warning("WORKER-CLEAR: checked %d sessions (clear_in_progress: %d)", num_expired, pw->clear_in_process);
   elog_acl_maybe_trace_X2(am, "acl_fa_worker_conn_cleaner: checked %d sessions (clear_in_process: %d)", "i4i4", (u32)num_expired, (u32)pw->clear_in_process);
   if (pw->clear_in_process) {
     if (0 == num_expired) {
       /* we were clearing but we could not process any more connections. time to stop. */
       clib_bitmap_zero(pw->pending_clear_sw_if_index_bitmap);
       pw->clear_in_process = 0;
       elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: now %lu, clearing done - all done", "i8", now);
     } else {
       elog_acl_maybe_trace_X1(am, "acl_fa_worker_conn_cleaner: now %lu, more work to do - requesting interrupt", "i8", now);
       /* should continue clearing.. So could they please sent an interrupt again? */
       pw->interrupt_is_needed = 1;
     }
   } else {
     if (num_expired >= am->fa_max_deleted_sessions_per_interval) {
       /* there was too much work, we should get an interrupt ASAP */
       pw->interrupt_is_needed = 1;
       pw->interrupt_is_unwanted = 0;
     } else if (num_expired <= am->fa_min_deleted_sessions_per_interval) {
       /* signal that they should trigger us less */
       pw->interrupt_is_needed = 0;
       pw->interrupt_is_unwanted = 1;
     } else {
       /* the current rate of interrupts is ok */
       pw->interrupt_is_needed = 0;
       pw->interrupt_is_unwanted = 0;
     }
     elog_acl_maybe_trace_X3(am, "acl_fa_worker_conn_cleaner: now %lu, interrupt needed: %u, interrupt unwanted: %u", "i8i4i4", now, ((u32)pw->interrupt_is_needed), ((u32)pw->interrupt_is_unwanted));
   }
   pw->interrupt_generation = am->fa_interrupt_generation;
   return 0;
}

static void
send_one_worker_interrupt (vlib_main_t * vm, acl_main_t *am, int thread_index)
{
  acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
  if (!pw->interrupt_is_pending) {
    pw->interrupt_is_pending = 1;
    vlib_node_set_interrupt_pending (vlib_mains[thread_index],
                  acl_fa_worker_session_cleaner_process_node.index);
    elog_acl_maybe_trace_X1(am, "send_one_worker_interrupt: send interrupt to worker %d", "i4", ((u32)thread_index));
    /* if the interrupt was requested, mark that done. */
    /* pw->interrupt_is_needed = 0; */
  }
}

static void
send_interrupts_to_workers (vlib_main_t * vm, acl_main_t *am)
{
  int i;
  /* Can't use vec_len(am->per_worker_data) since the threads might not have come up yet; */
  int n_threads = vec_len(vlib_mains);
  for (i = 0; i < n_threads; i++) {
    send_one_worker_interrupt(vm, am, i);
  }
}

/* centralized process to drive per-worker cleaners */
static uword
acl_fa_session_cleaner_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
				vlib_frame_t * f)
{
  acl_main_t *am = &acl_main;
  u64 now;
  f64 cpu_cps = vm->clib_time.clocks_per_second;
  u64 next_expire;
  /* We should check if there are connections to clean up - at least twice a second */
  u64 max_timer_wait_interval = cpu_cps / 2;
  uword event_type, *event_data = 0;
  acl_fa_per_worker_data_t *pw0;

  am->fa_current_cleaner_timer_wait_interval = max_timer_wait_interval;
  am->fa_cleaner_node_index = acl_fa_session_cleaner_process_node.index;
  am->fa_interrupt_generation = 1;
  while (1)
    {
      now = clib_cpu_time_now ();
      next_expire = now + am->fa_current_cleaner_timer_wait_interval;
      int has_pending_conns = 0;
      u16 ti;
      u8 tt;

      /*
       * walk over all per-thread list heads of different timeouts,
       * and see if there are any connections pending.
       * If there aren't - we do not need to wake up until the
       * worker code signals that it has added a connection.
       *
       * Also, while we are at it, calculate the earliest we need to wake up.
       */
      for(ti = 0; ti < vec_len(vlib_mains); ti++) {
        if (ti >= vec_len(am->per_worker_data)) {
          continue;
        }
        acl_fa_per_worker_data_t *pw = &am->per_worker_data[ti];
        for(tt = 0; tt < vec_len(pw->fa_conn_list_head); tt++) {
          u64 head_expiry = acl_fa_get_list_head_expiry_time(am, pw, now, ti, tt);
          if ((head_expiry < next_expire) && !pw->interrupt_is_pending) {
            elog_acl_maybe_trace_X3(am, "acl_fa_session_cleaner_process: now %lu, worker: %d tt: %d", "i8i2i2", now, ti, tt);
            elog_acl_maybe_trace_X2(am, "acl_fa_session_cleaner_process: head expiry: %lu, is earlier than curr next expire: %lu", "i8i8", head_expiry, next_expire);
            next_expire = head_expiry;
	  }
          if (~0 != pw->fa_conn_list_head[tt]) {
            has_pending_conns = 1;
          }
        }
      }

      /* If no pending connections and no ACL applied then no point in timing out */
      if (!has_pending_conns && (0 == am->fa_total_enabled_count))
        {
          am->fa_cleaner_cnt_wait_without_timeout++;
          elog_acl_maybe_trace_X1(am, "acl_conn_cleaner: now %lu entering wait without timeout", "i8", now);
          (void) vlib_process_wait_for_event (vm);
          event_type = vlib_process_get_events (vm, &event_data);
        }
      else
	{
	  f64 timeout = ((i64) next_expire - (i64) now) / cpu_cps;
	  if (timeout <= 0)
	    {
	      /* skip waiting altogether */
	      event_type = ~0;
	    }
	  else
	    {
              am->fa_cleaner_cnt_wait_with_timeout++;
              elog_acl_maybe_trace_X2(am, "acl_conn_cleaner: now %lu entering wait with timeout %.6f sec", "i8f8", now, timeout);
	      (void) vlib_process_wait_for_event_or_clock (vm, timeout);
	      event_type = vlib_process_get_events (vm, &event_data);
	    }
	}

      switch (event_type)
	{
	case ~0:
	  /* nothing to do */
	  break;
	case ACL_FA_CLEANER_RESCHEDULE:
	  /* Nothing to do. */
	  break;
	case ACL_FA_CLEANER_DELETE_BY_SW_IF_INDEX:
	  {
            uword *clear_sw_if_index_bitmap = 0;
	    uword *sw_if_index0;
            int clear_all = 0;
            now = clib_cpu_time_now ();
            elog_acl_maybe_trace_X1(am, "acl_fa_session_cleaner_process: now %lu, received ACL_FA_CLEANER_DELETE_BY_SW_IF_INDEX", "i8", now);
	    vec_foreach (sw_if_index0, event_data)
	    {
              am->fa_cleaner_cnt_delete_by_sw_index++;
              elog_acl_maybe_trace_X1(am, "acl_fa_session_cleaner_process: ACL_FA_CLEANER_DELETE_BY_SW_IF_INDEX %d", "i4", *sw_if_index0);
              if (*sw_if_index0 == ~0)
                {
                  clear_all = 1;
                }
              else
                {
                  if (!pool_is_free_index (am->vnet_main->interface_main.sw_interfaces, *sw_if_index0))
                    {
                      clear_sw_if_index_bitmap = clib_bitmap_set(clear_sw_if_index_bitmap, *sw_if_index0, 1);
                    }
                }
	    }
#ifdef FA_NODE_VERBOSE_DEBUG
	    clib_warning("ACL_FA_CLEANER_DELETE_BY_SW_IF_INDEX bitmap: %U", format_bitmap_hex, clear_sw_if_index_bitmap);
#endif
	    vec_foreach(pw0, am->per_worker_data) {
              CLIB_MEMORY_BARRIER ();
	      while (pw0->clear_in_process) {
                CLIB_MEMORY_BARRIER ();
                elog_acl_maybe_trace_X1(am, "ACL_FA_NODE_CLEAN: waiting previous cleaning cycle to finish on %d", "i4", (u32)(pw0 - am->per_worker_data));
                vlib_process_suspend(vm, 0.0001);
                if (pw0->interrupt_is_needed) {
                  send_one_worker_interrupt(vm, am, (pw0 - am->per_worker_data));
                }
              }
              if (pw0->clear_in_process) {
                clib_warning("ERROR-BUG! Could not initiate cleaning on worker because another cleanup in progress");
	      } else {
                if (clear_all)
                  {
                    /* if we need to clear all, then just clear the interfaces that we are servicing */
                    pw0->pending_clear_sw_if_index_bitmap = clib_bitmap_dup(pw0->serviced_sw_if_index_bitmap);
                  }
                else
                  {
                    pw0->pending_clear_sw_if_index_bitmap = clib_bitmap_dup(clear_sw_if_index_bitmap);
                  }
                pw0->clear_in_process = 1;
              }
            }
            /* send some interrupts so they can start working */
            send_interrupts_to_workers(vm, am);

            /* now wait till they all complete */
#ifdef FA_NODE_VERBOSE_DEBUG
	    clib_warning("CLEANER mains len: %d per-worker len: %d", vec_len(vlib_mains), vec_len(am->per_worker_data));
#endif
	    vec_foreach(pw0, am->per_worker_data) {
              CLIB_MEMORY_BARRIER ();
	      while (pw0->clear_in_process) {
                CLIB_MEMORY_BARRIER ();
                elog_acl_maybe_trace_X1(am, "ACL_FA_NODE_CLEAN: waiting for my cleaning cycle to finish on %d", "i4", (u32)(pw0 - am->per_worker_data));
                vlib_process_suspend(vm, 0.0001);
                if (pw0->interrupt_is_needed) {
                  send_one_worker_interrupt(vm, am, (pw0 - am->per_worker_data));
                }
              }
            }
#ifdef FA_NODE_VERBOSE_DEBUG
            clib_warning("ACL_FA_NODE_CLEAN: cleaning done");
#endif
            clib_bitmap_free(clear_sw_if_index_bitmap);
	  }
	  break;
	default:
#ifdef FA_NODE_VERBOSE_DEBUG
	  clib_warning ("ACL plugin connection cleaner: unknown event %u",
			event_type);
#endif
          vlib_node_increment_counter (vm,
                                       acl_fa_session_cleaner_process_node.
                                       index,
                                       ACL_FA_CLEANER_ERROR_UNKNOWN_EVENT, 1);
          am->fa_cleaner_cnt_unknown_event++;
	  break;
	}

      send_interrupts_to_workers(vm, am);

      if (event_data)
	_vec_len (event_data) = 0;

      /*
       * If the interrupts were not processed yet, ensure we wait a bit,
       * but up to a point.
       */
      int need_more_wait = 0;
      int max_wait_cycles = 100;
      do {
        need_more_wait = 0;
        vec_foreach(pw0, am->per_worker_data) {
          if (pw0->interrupt_generation != am->fa_interrupt_generation) {
            need_more_wait = 1;
          }
        }
        if (need_more_wait) {
          vlib_process_suspend(vm, 0.0001);
        }
      } while (need_more_wait && (--max_wait_cycles > 0));

      int interrupts_needed = 0;
      int interrupts_unwanted = 0;

      vec_foreach(pw0, am->per_worker_data) {
        if (pw0->interrupt_is_needed) {
          interrupts_needed++;
          /* the per-worker value is reset when sending the interrupt */
        }
        if (pw0->interrupt_is_unwanted) {
          interrupts_unwanted++;
          pw0->interrupt_is_unwanted = 0;
        }
      }
      if (interrupts_needed) {
        /* they need more interrupts, do less waiting around next time */
        am->fa_current_cleaner_timer_wait_interval /= 2;
        /* never go into zero-wait either though - we need to give the space to others */
        am->fa_current_cleaner_timer_wait_interval += 1; 
      } else if (interrupts_unwanted) {
        /* slowly increase the amount of sleep up to a limit */
        if (am->fa_current_cleaner_timer_wait_interval < max_timer_wait_interval)
          am->fa_current_cleaner_timer_wait_interval += cpu_cps * am->fa_cleaner_wait_time_increment;
      }
      am->fa_cleaner_cnt_event_cycles++;
      am->fa_interrupt_generation++;
    }
  /* NOT REACHED */
  return 0;
}


void
acl_fa_enable_disable (u32 sw_if_index, int is_input, int enable_disable)
{
  acl_main_t *am = &acl_main;
  if (enable_disable) {
    acl_fa_verify_init_sessions(am);
    am->fa_total_enabled_count++;
    void *oldheap = clib_mem_set_heap (am->vlib_main->heap_base);
    vlib_process_signal_event (am->vlib_main, am->fa_cleaner_node_index,
                                 ACL_FA_CLEANER_RESCHEDULE, 0);
    clib_mem_set_heap (oldheap);
  } else {
    am->fa_total_enabled_count--;
  }

  if (is_input)
    {
      ASSERT(clib_bitmap_get(am->fa_in_acl_on_sw_if_index, sw_if_index) != enable_disable);
      void *oldheap = clib_mem_set_heap (am->vlib_main->heap_base);
      vnet_feature_enable_disable ("ip4-unicast", "acl-plugin-in-ip4-fa",
				   sw_if_index, enable_disable, 0, 0);
      vnet_feature_enable_disable ("ip6-unicast", "acl-plugin-in-ip6-fa",
				   sw_if_index, enable_disable, 0, 0);
      clib_mem_set_heap (oldheap);
      am->fa_in_acl_on_sw_if_index =
	clib_bitmap_set (am->fa_in_acl_on_sw_if_index, sw_if_index,
			 enable_disable);
    }
  else
    {
      ASSERT(clib_bitmap_get(am->fa_out_acl_on_sw_if_index, sw_if_index) != enable_disable);
      void *oldheap = clib_mem_set_heap (am->vlib_main->heap_base);
      vnet_feature_enable_disable ("ip4-output", "acl-plugin-out-ip4-fa",
				   sw_if_index, enable_disable, 0, 0);
      vnet_feature_enable_disable ("ip6-output", "acl-plugin-out-ip6-fa",
				   sw_if_index, enable_disable, 0, 0);
      clib_mem_set_heap (oldheap);
      am->fa_out_acl_on_sw_if_index =
	clib_bitmap_set (am->fa_out_acl_on_sw_if_index, sw_if_index,
			 enable_disable);
    }
  if ((!enable_disable) && (!acl_fa_ifc_has_in_acl (am, sw_if_index))
      && (!acl_fa_ifc_has_out_acl (am, sw_if_index)))
    {
#ifdef FA_NODE_VERBOSE_DEBUG
      clib_warning("ENABLE-DISABLE: clean the connections on interface %d", sw_if_index);
#endif
      void *oldheap = clib_mem_set_heap (am->vlib_main->heap_base);
      vlib_process_signal_event (am->vlib_main, am->fa_cleaner_node_index,
				 ACL_FA_CLEANER_DELETE_BY_SW_IF_INDEX,
				 sw_if_index);
      clib_mem_set_heap (oldheap);
    }
}

void
show_fa_sessions_hash(vlib_main_t * vm, u32 verbose)
{
  acl_main_t *am = &acl_main;
  if (am->fa_sessions_hash_is_initialized) {
    vlib_cli_output(vm, "\nSession lookup hash table:\n%U\n\n",
                  BV (format_bihash), &am->fa_sessions_hash, verbose);
  } else {
    vlib_cli_output(vm, "\nSession lookup hash table is not allocated.\n\n");
  }
}


/* *INDENT-OFF* */

VLIB_REGISTER_NODE (acl_fa_worker_session_cleaner_process_node, static) = {
  .function = acl_fa_worker_conn_cleaner_process,
  .name = "acl-plugin-fa-worker-cleaner-process",
  .type = VLIB_NODE_TYPE_INPUT,
  .state = VLIB_NODE_STATE_INTERRUPT,
};

VLIB_REGISTER_NODE (acl_fa_session_cleaner_process_node, static) = {
  .function = acl_fa_session_cleaner_process,
  .type = VLIB_NODE_TYPE_PROCESS,
  .name = "acl-plugin-fa-cleaner-process",
  .n_errors = ARRAY_LEN (acl_fa_cleaner_error_strings),
  .error_strings = acl_fa_cleaner_error_strings,
  .n_next_nodes = 0,
  .next_nodes = {},
};


VLIB_REGISTER_NODE (acl_in_l2_ip6_node) =
{
  .function = acl_in_ip6_l2_node_fn,
  .name = "acl-plugin-in-ip6-l2",
  .vector_size = sizeof (u32),
  .format_trace = format_acl_fa_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (acl_fa_error_strings),
  .error_strings = acl_fa_error_strings,
  .n_next_nodes = ACL_FA_N_NEXT,
  .next_nodes =
  {
    [ACL_FA_ERROR_DROP] = "error-drop",
  }
};

VLIB_REGISTER_NODE (acl_in_l2_ip4_node) =
{
  .function = acl_in_ip4_l2_node_fn,
  .name = "acl-plugin-in-ip4-l2",
  .vector_size = sizeof (u32),
  .format_trace = format_acl_fa_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (acl_fa_error_strings),
  .error_strings = acl_fa_error_strings,
  .n_next_nodes = ACL_FA_N_NEXT,
  .next_nodes =
  {
    [ACL_FA_ERROR_DROP] = "error-drop",
  }
};

VLIB_REGISTER_NODE (acl_out_l2_ip6_node) =
{
  .function = acl_out_ip6_l2_node_fn,
  .name = "acl-plugin-out-ip6-l2",
  .vector_size = sizeof (u32),
  .format_trace = format_acl_fa_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (acl_fa_error_strings),
  .error_strings = acl_fa_error_strings,
  .n_next_nodes = ACL_FA_N_NEXT,
  .next_nodes =
  {
    [ACL_FA_ERROR_DROP] = "error-drop",
  }
};

VLIB_REGISTER_NODE (acl_out_l2_ip4_node) =
{
  .function = acl_out_ip4_l2_node_fn,
  .name = "acl-plugin-out-ip4-l2",
  .vector_size = sizeof (u32),
  .format_trace = format_acl_fa_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (acl_fa_error_strings),
  .error_strings = acl_fa_error_strings,
  .n_next_nodes = ACL_FA_N_NEXT,
  .next_nodes =
  {
    [ACL_FA_ERROR_DROP] = "error-drop",
  }
};


VLIB_REGISTER_NODE (acl_in_fa_ip6_node) =
{
  .function = acl_in_ip6_fa_node_fn,
  .name = "acl-plugin-in-ip6-fa",
  .vector_size = sizeof (u32),
  .format_trace = format_acl_fa_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (acl_fa_error_strings),
  .error_strings = acl_fa_error_strings,
  .n_next_nodes = ACL_FA_N_NEXT,
  .next_nodes =
  {
    [ACL_FA_ERROR_DROP] = "error-drop",
  }
};

VNET_FEATURE_INIT (acl_in_ip6_fa_feature, static) =
{
  .arc_name = "ip6-unicast",
  .node_name = "acl-plugin-in-ip6-fa",
  .runs_before = VNET_FEATURES ("ip6-flow-classify"),
};

VLIB_REGISTER_NODE (acl_in_fa_ip4_node) =
{
  .function = acl_in_ip4_fa_node_fn,
  .name = "acl-plugin-in-ip4-fa",
  .vector_size = sizeof (u32),
  .format_trace = format_acl_fa_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (acl_fa_error_strings),
  .error_strings = acl_fa_error_strings,
  .n_next_nodes = ACL_FA_N_NEXT,
  .next_nodes =
  {
    [ACL_FA_ERROR_DROP] = "error-drop",
  }
};

VNET_FEATURE_INIT (acl_in_ip4_fa_feature, static) =
{
  .arc_name = "ip4-unicast",
  .node_name = "acl-plugin-in-ip4-fa",
  .runs_before = VNET_FEATURES ("ip4-flow-classify"),
};


VLIB_REGISTER_NODE (acl_out_fa_ip6_node) =
{
  .function = acl_out_ip6_fa_node_fn,
  .name = "acl-plugin-out-ip6-fa",
  .vector_size = sizeof (u32),
  .format_trace = format_acl_fa_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (acl_fa_error_strings),
  .error_strings = acl_fa_error_strings,
  .n_next_nodes = ACL_FA_N_NEXT,
  .next_nodes =
  {
    [ACL_FA_ERROR_DROP] = "error-drop",
  }
};

VNET_FEATURE_INIT (acl_out_ip6_fa_feature, static) =
{
  .arc_name = "ip6-output",
  .node_name = "acl-plugin-out-ip6-fa",
  .runs_before = VNET_FEATURES ("interface-output"),
};

VLIB_REGISTER_NODE (acl_out_fa_ip4_node) =
{
  .function = acl_out_ip4_fa_node_fn,
  .name = "acl-plugin-out-ip4-fa",
  .vector_size = sizeof (u32),
  .format_trace = format_acl_fa_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (acl_fa_error_strings),
  .error_strings = acl_fa_error_strings,
  .n_next_nodes = ACL_FA_N_NEXT,
    /* edit / add dispositions here */
  .next_nodes =
  {
    [ACL_FA_ERROR_DROP] = "error-drop",
  }
};

VNET_FEATURE_INIT (acl_out_ip4_fa_feature, static) =
{
  .arc_name = "ip4-output",
  .node_name = "acl-plugin-out-ip4-fa",
  .runs_before = VNET_FEATURES ("interface-output"),
};


/* *INDENT-ON* */