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authorJakub Grajciar <jgrajcia@cisco.com>2019-10-01 11:30:56 +0200
committerOle Trøan <otroan@employees.org>2019-10-03 10:07:21 +0000
commit103ba6ba9ecd1d65bcbd3bb4edc115beb9ee7671 (patch)
treeeca605b6a3860425958b501b9eb215f8ac84326c /test/vpp_papi_provider.py
parentd6d50cebde647f9a5ee7251a7fef977506f315d7 (diff)
dhcp: API cleanup
Use consistent API types. Type: fix Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com> Change-Id: Ia63d920788add2584060a240321acced7a471640
Diffstat (limited to 'test/vpp_papi_provider.py')
-rw-r--r--test/vpp_papi_provider.py100
1 files changed, 4 insertions, 96 deletions
diff --git a/test/vpp_papi_provider.py b/test/vpp_papi_provider.py
index 13babf28a51..0ba8af1f800 100644
--- a/test/vpp_papi_provider.py
+++ b/test/vpp_papi_provider.py
@@ -50,7 +50,8 @@ defaultmapping = {
'dhcp6_clients_enable_disable': {'enable': 1, },
'dhcp6_pd_client_enable_disable': {'enable': 1, },
'dhcp6_send_client_message': {'server_index': 4294967295, 'mrc': 1, },
- 'dhcp_client_config': {'is_add': 1, 'set_broadcast_flag': 1, },
+ 'dhcp6_pd_send_client_message': {'server_index': 0xFFFFFFFF, 'mrc': 1},
+ 'dhcp_client_config': {'is_add': 1, 'client': {'set_broadcast_flag': 1}, },
'dhcp_proxy_config': {'is_add': 1, },
'dhcp_proxy_set_vss': {'vss_type': 255, 'is_add': 1, },
'gbp_subnet_add_del': {'sw_if_index': 4294967295, 'epg_id': 65535, },
@@ -147,6 +148,8 @@ defaultmapping = {
'want_ip6_nd_events': {'enable_disable': 1, 'ip': '::', },
'want_ip6_ra_events': {'enable_disable': 1, },
'want_l2_macs_events': {'enable_disable': 1, },
+ 'want_dhcp6_reply_events': {'enable_disable': 1, 'pid': os.getpid(), },
+ 'want_dhcp6_pd_reply_events': {'enable_disable': 1, 'pid': os.getpid(), },
}
@@ -409,41 +412,6 @@ class VppPapiProvider(object):
'learn_limit': learn_limit,
'pid': os.getpid(), })
- def want_dhcp6_reply_events(self, enable_disable=1):
- return self.api(self.papi.want_dhcp6_reply_events,
- {'enable_disable': enable_disable,
- 'pid': os.getpid()})
-
- def want_dhcp6_pd_reply_events(self, enable_disable=1):
- return self.api(self.papi.want_dhcp6_pd_reply_events,
- {'enable_disable': enable_disable,
- 'pid': os.getpid()})
-
- def dhcp6_pd_send_client_message(self, msg_type, sw_if_index, T1, T2,
- prefixes, server_index=0xFFFFFFFF,
- irt=0, mrt=0, mrc=1, mrd=0, stop=0,
- ):
- return self.api(self.papi.dhcp6_pd_send_client_message,
- {'sw_if_index': sw_if_index,
- 'server_index': server_index,
- 'irt': irt,
- 'mrt': mrt,
- 'mrc': mrc,
- 'mrd': mrd,
- 'stop': stop,
- 'msg_type': msg_type,
- 'T1': T1,
- 'T2': T2,
- 'n_prefixes': len(prefixes),
- 'prefixes': prefixes})
-
- def dhcp6_pd_client_enable_disable(self, sw_if_index, prefix_group='',
- enable=1):
- return self.api(self.papi.dhcp6_pd_client_enable_disable,
- {'sw_if_index': sw_if_index,
- 'prefix_group': prefix_group,
- 'enable': enable})
-
def ip6_add_del_address_using_prefix(self, sw_if_index, address,
prefix_length, prefix_group,
is_add=1):
@@ -907,66 +875,6 @@ class VppPapiProvider(object):
'udp_checksum': udp_checksum,
})
- def dhcp_proxy_config(self,
- dhcp_server,
- dhcp_src_address,
- rx_table_id=0,
- server_table_id=0,
- is_add=1,
- is_ipv6=0):
- return self.api(
- self.papi.dhcp_proxy_config,
- {
- 'rx_vrf_id': rx_table_id,
- 'server_vrf_id': server_table_id,
- 'is_ipv6': is_ipv6,
- 'is_add': is_add,
- 'dhcp_server': dhcp_server,
- 'dhcp_src_address': dhcp_src_address,
- })
-
- def dhcp_proxy_set_vss(self,
- table_id,
- vss_type=255,
- vpn_ascii_id="",
- oui=0,
- vpn_index=0,
- is_add=1,
- is_ip6=0):
- return self.api(
- self.papi.dhcp_proxy_set_vss,
- {
- 'tbl_id': table_id,
- 'vss_type': vss_type,
- 'vpn_ascii_id': vpn_ascii_id,
- 'oui': oui,
- 'vpn_index': vpn_index,
- 'is_add': is_add,
- 'is_ipv6': is_ip6,
- })
-
- def dhcp_client_config(self,
- sw_if_index,
- hostname,
- client_id='',
- is_add=1,
- set_broadcast_flag=1,
- want_dhcp_events=0,
- dscp=0):
- return self.api(
- self.papi.dhcp_client_config,
- {
- 'is_add': is_add,
- 'client': {
- 'sw_if_index': sw_if_index,
- 'hostname': hostname,
- 'id': client_id,
- 'want_dhcp_event': want_dhcp_events,
- 'set_broadcast_flag': set_broadcast_flag,
- 'dscp': dscp,
- 'pid': os.getpid()}
- })
-
def ip_mroute_add_del(self,
table_id,
prefix,
n406'>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 
/*
 * 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 <lb/lb.h>
#include <vnet/plugin/plugin.h>
#include <vpp/app/version.h>
#include <vnet/api_errno.h>
#include <vnet/udp/udp.h>
#include <vppinfra/lock.h>

//GC runs at most once every so many seconds
#define LB_GARBAGE_RUN 60

//After so many seconds. It is assumed that inter-core race condition will not occur.
#define LB_CONCURRENCY_TIMEOUT 10

// FIB source for adding routes
static fib_source_t lb_fib_src;

lb_main_t lb_main;

#define lb_get_writer_lock() clib_spinlock_lock (&lb_main.writer_lock)
#define lb_put_writer_lock() clib_spinlock_unlock (&lb_main.writer_lock)

static void lb_as_stack (lb_as_t *as);


const static char * const lb_dpo_gre4_ip4[] = { "lb4-gre4" , NULL };
const static char * const lb_dpo_gre4_ip6[] = { "lb6-gre4" , NULL };
const static char* const * const lb_dpo_gre4_nodes[DPO_PROTO_NUM] =
    {
        [DPO_PROTO_IP4]  = lb_dpo_gre4_ip4,
        [DPO_PROTO_IP6]  = lb_dpo_gre4_ip6,
    };

const static char * const lb_dpo_gre6_ip4[] = { "lb4-gre6" , NULL };
const static char * const lb_dpo_gre6_ip6[] = { "lb6-gre6" , NULL };
const static char* const * const lb_dpo_gre6_nodes[DPO_PROTO_NUM] =
    {
        [DPO_PROTO_IP4]  = lb_dpo_gre6_ip4,
        [DPO_PROTO_IP6]  = lb_dpo_gre6_ip6,
    };

const static char * const lb_dpo_gre4_ip4_port[] = { "lb4-gre4-port" , NULL };
const static char * const lb_dpo_gre4_ip6_port[] = { "lb6-gre4-port" , NULL };
const static char* const * const lb_dpo_gre4_port_nodes[DPO_PROTO_NUM] =
    {
        [DPO_PROTO_IP4]  = lb_dpo_gre4_ip4_port,
        [DPO_PROTO_IP6]  = lb_dpo_gre4_ip6_port,
    };

const static char * const lb_dpo_gre6_ip4_port[] = { "lb4-gre6-port" , NULL };
const static char * const lb_dpo_gre6_ip6_port[] = { "lb6-gre6-port" , NULL };
const static char* const * const lb_dpo_gre6_port_nodes[DPO_PROTO_NUM] =
    {
        [DPO_PROTO_IP4]  = lb_dpo_gre6_ip4_port,
        [DPO_PROTO_IP6]  = lb_dpo_gre6_ip6_port,
    };

const static char * const lb_dpo_l3dsr_ip4[] = {"lb4-l3dsr" , NULL};
const static char* const * const lb_dpo_l3dsr_nodes[DPO_PROTO_NUM] =
    {
        [DPO_PROTO_IP4]  = lb_dpo_l3dsr_ip4,
    };

const static char * const lb_dpo_l3dsr_ip4_port[] = {"lb4-l3dsr-port" , NULL};
const static char* const * const lb_dpo_l3dsr_port_nodes[DPO_PROTO_NUM] =
    {
        [DPO_PROTO_IP4]  = lb_dpo_l3dsr_ip4_port,
    };

const static char * const lb_dpo_nat4_ip4_port[] = { "lb4-nat4-port" , NULL };
const static char* const * const lb_dpo_nat4_port_nodes[DPO_PROTO_NUM] =
    {
        [DPO_PROTO_IP4]  = lb_dpo_nat4_ip4_port,
    };

const static char * const lb_dpo_nat6_ip6_port[] = { "lb6-nat6-port" , NULL };
const static char* const * const lb_dpo_nat6_port_nodes[DPO_PROTO_NUM] =
    {
        [DPO_PROTO_IP6]  = lb_dpo_nat6_ip6_port,
    };

u32 lb_hash_time_now(vlib_main_t * vm)
{
  return (u32) (vlib_time_now(vm) + 10000);
}

u8 *format_lb_main (u8 * s, va_list * args)
{
  vlib_thread_main_t *tm = vlib_get_thread_main();
  lb_main_t *lbm = &lb_main;
  s = format(s, "lb_main");
  s = format(s, " ip4-src-address: %U \n", format_ip4_address, &lbm->ip4_src_address);
  s = format(s, " ip6-src-address: %U \n", format_ip6_address, &lbm->ip6_src_address);
  s = format(s, " #vips: %u\n", pool_elts(lbm->vips));
  s = format(s, " #ass: %u\n", pool_elts(lbm->ass) - 1);

  u32 thread_index;
  for(thread_index = 0; thread_index < tm->n_vlib_mains; thread_index++ ) {
    lb_hash_t *h = lbm->per_cpu[thread_index].sticky_ht;
    if (h) {
      s = format(s, "core %d\n", thread_index);
      s = format(s, "  timeout: %ds\n", h->timeout);
      s = format(s, "  usage: %d / %d\n", lb_hash_elts(h, lb_hash_time_now(vlib_get_main())),  lb_hash_size(h));
    }
  }

  return s;
}

static char *lb_vip_type_strings[] = {
    [LB_VIP_TYPE_IP6_GRE6] = "ip6-gre6",
    [LB_VIP_TYPE_IP6_GRE4] = "ip6-gre4",
    [LB_VIP_TYPE_IP4_GRE6] = "ip4-gre6",
    [LB_VIP_TYPE_IP4_GRE4] = "ip4-gre4",
    [LB_VIP_TYPE_IP4_L3DSR] = "ip4-l3dsr",
    [LB_VIP_TYPE_IP4_NAT4] = "ip4-nat4",
    [LB_VIP_TYPE_IP6_NAT6] = "ip6-nat6",
};

u8 *format_lb_vip_type (u8 * s, va_list * args)
{
  lb_vip_type_t vipt = va_arg (*args, lb_vip_type_t);
  u32 i;
  for (i=0; i<LB_VIP_N_TYPES; i++)
    if (vipt == i)
      return format(s, lb_vip_type_strings[i]);
  return format(s, "_WRONG_TYPE_");
}

uword unformat_lb_vip_type (unformat_input_t * input, va_list * args)
{
  lb_vip_type_t *vipt = va_arg (*args, lb_vip_type_t *);
  u32 i;
  for (i=0; i<LB_VIP_N_TYPES; i++)
    if (unformat(input, lb_vip_type_strings[i])) {
      *vipt = i;
      return 1;
    }
  return 0;
}

u8 *format_lb_vip (u8 * s, va_list * args)
{
  lb_vip_t *vip = va_arg (*args, lb_vip_t *);
  s = format(s, "%U %U new_size:%u #as:%u%s",
             format_lb_vip_type, vip->type,
             format_ip46_prefix, &vip->prefix, vip->plen, IP46_TYPE_ANY,
             vip->new_flow_table_mask + 1,
             pool_elts(vip->as_indexes),
             (vip->flags & LB_VIP_FLAGS_USED)?"":" removed");

  if (vip->port != 0)
    {
      s = format(s, "  protocol:%u port:%u ", vip->protocol, vip->port);
    }

  if (vip->type == LB_VIP_TYPE_IP4_L3DSR)
    {
      s = format(s, "  dscp:%u", vip->encap_args.dscp);
    }
  else if ((vip->type == LB_VIP_TYPE_IP4_NAT4)
          || (vip->type == LB_VIP_TYPE_IP6_NAT6))
    {
      s = format (s, " type:%s port:%u target_port:%u",
         (vip->encap_args.srv_type == LB_SRV_TYPE_CLUSTERIP)?"clusterip":
             "nodeport",
         ntohs(vip->port), ntohs(vip->encap_args.target_port));
    }

  return s;
}

u8 *format_lb_as (u8 * s, va_list * args)
{
  lb_as_t *as = va_arg (*args, lb_as_t *);
  return format(s, "%U %s", format_ip46_address,
                &as->address, IP46_TYPE_ANY,
                (as->flags & LB_AS_FLAGS_USED)?"used":"removed");
}

u8 *format_lb_vip_detailed (u8 * s, va_list * args)
{
  lb_main_t *lbm = &lb_main;
  lb_vip_t *vip = va_arg (*args, lb_vip_t *);
  u32 indent = format_get_indent (s);

  s = format(s, "%U %U [%lu] %U%s\n"
                   "%U  new_size:%u\n",
                  format_white_space, indent,
                  format_lb_vip_type, vip->type,
                  vip - lbm->vips,
                  format_ip46_prefix, &vip->prefix, (u32) vip->plen, IP46_TYPE_ANY,
                  (vip->flags & LB_VIP_FLAGS_USED)?"":" removed",
                  format_white_space, indent,
                  vip->new_flow_table_mask + 1);

  if (vip->port != 0)
    {
      s = format(s, "%U  protocol:%u port:%u\n",
                 format_white_space, indent,
                 vip->protocol, vip->port);
    }

  if (vip->type == LB_VIP_TYPE_IP4_L3DSR)
    {
      s = format(s, "%U  dscp:%u\n",
                    format_white_space, indent,
                    vip->encap_args.dscp);
    }
  else if ((vip->type == LB_VIP_TYPE_IP4_NAT4)
          || (vip->type == LB_VIP_TYPE_IP6_NAT6))
    {
      s = format (s, "%U  type:%s port:%u target_port:%u",
         format_white_space, indent,
         (vip->encap_args.srv_type == LB_SRV_TYPE_CLUSTERIP)?"clusterip":
             "nodeport",
         ntohs(vip->port), ntohs(vip->encap_args.target_port));
    }

  //Print counters
  s = format(s, "%U  counters:\n",
             format_white_space, indent);
  u32 i;
  for (i=0; i<LB_N_VIP_COUNTERS; i++)
    s = format(s, "%U    %s: %Lu\n",
               format_white_space, indent,
               lbm->vip_counters[i].name,
               vlib_get_simple_counter(&lbm->vip_counters[i], vip - lbm->vips));


  s = format(s, "%U  #as:%u\n",
             format_white_space, indent,
             pool_elts(vip->as_indexes));

  //Let's count the buckets for each AS
  u32 *count = 0;
  vec_validate(count, pool_len(lbm->ass)); //Possibly big alloc for not much...
  lb_new_flow_entry_t *nfe;
  vec_foreach(nfe, vip->new_flow_table)
    count[nfe->as_index]++;

  lb_as_t *as;
  u32 *as_index;
  pool_foreach(as_index, vip->as_indexes, {
      as = &lbm->ass[*as_index];
      s = format(s, "%U    %U %u buckets   %Lu flows  dpo:%u %s\n",
                   format_white_space, indent,
                   format_ip46_address, &as->address, IP46_TYPE_ANY,
                   count[as - lbm->ass],
                   vlib_refcount_get(&lbm->as_refcount, as - lbm->ass),
                   as->dpo.dpoi_index,
                   (as->flags & LB_AS_FLAGS_USED)?"used":" removed");
  });

  vec_free(count);
  return s;
}

typedef struct {
  u32 as_index;
  u32 last;
  u32 skip;
} lb_pseudorand_t;

static int lb_pseudorand_compare(void *a, void *b)
{
  lb_as_t *asa, *asb;
  lb_main_t *lbm = &lb_main;
  asa = &lbm->ass[((lb_pseudorand_t *)a)->as_index];
  asb = &lbm->ass[((lb_pseudorand_t *)b)->as_index];
  return memcmp(&asa->address, &asb->address, sizeof(asb->address));
}

static void lb_vip_garbage_collection(lb_vip_t *vip)
{
  lb_main_t *lbm = &lb_main;
  lb_snat4_key_t m_key4;
  clib_bihash_kv_8_8_t kv4, value4;
  lb_snat6_key_t m_key6;
  clib_bihash_kv_24_8_t kv6, value6;
  lb_snat_mapping_t *m = 0;
  CLIB_SPINLOCK_ASSERT_LOCKED (&lbm->writer_lock);

  u32 now = (u32) vlib_time_now(vlib_get_main());
  if (!clib_u32_loop_gt(now, vip->last_garbage_collection + LB_GARBAGE_RUN))
    return;

  vip->last_garbage_collection = now;
  lb_as_t *as;
  u32 *as_index;
  pool_foreach(as_index, vip->as_indexes, {
      as = &lbm->ass[*as_index];
      if (!(as->flags & LB_AS_FLAGS_USED) && //Not used
          clib_u32_loop_gt(now, as->last_used + LB_CONCURRENCY_TIMEOUT) &&
          (vlib_refcount_get(&lbm->as_refcount, as - lbm->ass) == 0))
        { //Not referenced

          if (lb_vip_is_nat4_port(vip)) {
              m_key4.addr = as->address.ip4;
              m_key4.port = vip->encap_args.target_port;
              m_key4.protocol = 0;
              m_key4.fib_index = 0;

              kv4.key = m_key4.as_u64;
              if(!clib_bihash_search_8_8(&lbm->mapping_by_as4, &kv4, &value4))
                m = pool_elt_at_index (lbm->snat_mappings, value4.value);
              ASSERT (m);

              kv4.value = m - lbm->snat_mappings;
              clib_bihash_add_del_8_8(&lbm->mapping_by_as4, &kv4, 0);
              pool_put (lbm->snat_mappings, m);
          } else if (lb_vip_is_nat6_port(vip)) {
              m_key6.addr.as_u64[0] = as->address.ip6.as_u64[0];
              m_key6.addr.as_u64[1] = as->address.ip6.as_u64[1];
              m_key6.port = vip->encap_args.target_port;
              m_key6.protocol = 0;
              m_key6.fib_index = 0;

              kv6.key[0] = m_key6.as_u64[0];
              kv6.key[1] = m_key6.as_u64[1];
              kv6.key[2] = m_key6.as_u64[2];

              if (!clib_bihash_search_24_8 (&lbm->mapping_by_as6, &kv6, &value6))
                m = pool_elt_at_index (lbm->snat_mappings, value6.value);
              ASSERT (m);

              kv6.value = m - lbm->snat_mappings;
              clib_bihash_add_del_24_8(&lbm->mapping_by_as6, &kv6, 0);
              pool_put (lbm->snat_mappings, m);
          }
          fib_entry_child_remove(as->next_hop_fib_entry_index,
                                as->next_hop_child_index);
          fib_table_entry_delete_index(as->next_hop_fib_entry_index,
                                       FIB_SOURCE_RR);
          as->next_hop_fib_entry_index = FIB_NODE_INDEX_INVALID;

          pool_put(vip->as_indexes, as_index);
          pool_put(lbm->ass, as);
        }
  });
}

void lb_garbage_collection()
{
  lb_main_t *lbm = &lb_main;
  lb_get_writer_lock();
  lb_vip_t *vip;
  u32 *to_be_removed_vips = 0, *i;
  pool_foreach(vip, lbm->vips, {
      lb_vip_garbage_collection(vip);

      if (!(vip->flags & LB_VIP_FLAGS_USED) &&
          (pool_elts(vip->as_indexes) == 0)) {
        vec_add1(to_be_removed_vips, vip - lbm->vips);
      }
  });

  vec_foreach(i, to_be_removed_vips) {
    vip = &lbm->vips[*i];
    pool_put(lbm->vips, vip);
    pool_free(vip->as_indexes);
  }

  vec_free(to_be_removed_vips);
  lb_put_writer_lock();
}

static void lb_vip_update_new_flow_table(lb_vip_t *vip)
{
  lb_main_t *lbm = &lb_main;
  lb_new_flow_entry_t *old_table;
  u32 i, *as_index;
  lb_new_flow_entry_t *new_flow_table = 0;
  lb_as_t *as;
  lb_pseudorand_t *pr, *sort_arr = 0;

  CLIB_SPINLOCK_ASSERT_LOCKED (&lbm->writer_lock); // We must have the lock

  //Check if some AS is configured or not
  i = 0;
  pool_foreach(as_index, vip->as_indexes, {
      as = &lbm->ass[*as_index];
      if (as->flags & LB_AS_FLAGS_USED) { //Not used anymore
        i = 1;
        goto out; //Not sure 'break' works in this macro-loop
      }
  });

out:
  if (i == 0) {
    //Only the default. i.e. no AS
    vec_validate(new_flow_table, vip->new_flow_table_mask);
    for (i=0; i<vec_len(new_flow_table); i++)
      new_flow_table[i].as_index = 0;

    goto finished;
  }

  //First, let's sort the ASs
  vec_alloc(sort_arr, pool_elts(vip->as_indexes));

  i = 0;
  pool_foreach(as_index, vip->as_indexes, {
      as = &lbm->ass[*as_index];
      if (!(as->flags & LB_AS_FLAGS_USED)) //Not used anymore
        continue;

      sort_arr[i].as_index = as - lbm->ass;
      i++;
  });
  _vec_len(sort_arr) = i;

  vec_sort_with_function(sort_arr, lb_pseudorand_compare);

  //Now let's pseudo-randomly generate permutations
  vec_foreach(pr, sort_arr) {
    lb_as_t *as = &lbm->ass[pr->as_index];

    u64 seed = clib_xxhash(as->address.as_u64[0] ^
                           as->address.as_u64[1]);
    /* We have 2^n buckets.
     * skip must be prime with 2^n.
     * So skip must be odd.
     * MagLev actually state that M should be prime,
     * but this has a big computation cost (% operation).
     * Using 2^n is more better (& operation).
     */
    pr->skip = ((seed & 0xffffffff) | 1) & vip->new_flow_table_mask;
    pr->last = (seed >> 32) & vip->new_flow_table_mask;
  }

  //Let's create a new flow table
  vec_validate(new_flow_table, vip->new_flow_table_mask);
  for (i=0; i<vec_len(new_flow_table); i++)
    new_flow_table[i].as_index = 0;

  u32 done = 0;
  while (1) {
    vec_foreach(pr, sort_arr) {
      while (1) {
        u32 last = pr->last;
        pr->last = (pr->last + pr->skip) & vip->new_flow_table_mask;
        if (new_flow_table[last].as_index == 0) {
          new_flow_table[last].as_index = pr->as_index;
          break;
        }
      }
      done++;
      if (done == vec_len(new_flow_table))
        goto finished;
    }
  }

finished:
  vec_free(sort_arr);

  old_table = vip->new_flow_table;
  vip->new_flow_table = new_flow_table;
  vec_free(old_table);
}

int lb_conf(ip4_address_t *ip4_address, ip6_address_t *ip6_address,
           u32 per_cpu_sticky_buckets, u32 flow_timeout)
{
  lb_main_t *lbm = &lb_main;

  if (!is_pow2(per_cpu_sticky_buckets))
    return VNET_API_ERROR_INVALID_MEMORY_SIZE;

  lb_get_writer_lock(); //Not exactly necessary but just a reminder that it exists for my future self
  lbm->ip4_src_address = *ip4_address;
  lbm->ip6_src_address = *ip6_address;
  lbm->per_cpu_sticky_buckets = per_cpu_sticky_buckets;
  lbm->flow_timeout = flow_timeout;
  lb_put_writer_lock();
  return 0;
}



static
int lb_vip_port_find_index(ip46_address_t *prefix, u8 plen,
                           u8 protocol, u16 port,
                           lb_lkp_type_t lkp_type,
                           u32 *vip_index)
{
  lb_main_t *lbm = &lb_main;
  lb_vip_t *vip;
  /* This must be called with the lock owned */
  CLIB_SPINLOCK_ASSERT_LOCKED (&lbm->writer_lock);
  ip46_prefix_normalize(prefix, plen);
  pool_foreach(vip, lbm->vips, {
      if ((vip->flags & LB_AS_FLAGS_USED) &&
          vip->plen == plen &&
          vip->prefix.as_u64[0] == prefix->as_u64[0] &&
          vip->prefix.as_u64[1] == prefix->as_u64[1])
        {
          if((lkp_type == LB_LKP_SAME_IP_PORT &&
               vip->protocol == protocol &&
               vip->port == port) ||
             (lkp_type == LB_LKP_ALL_PORT_IP &&
               vip->port == 0) ||
             (lkp_type == LB_LKP_DIFF_IP_PORT &&
                (vip->protocol != protocol ||
                vip->port != port) ) )
            {
              *vip_index = vip - lbm->vips;
              return 0;
            }
        }
  });
  return VNET_API_ERROR_NO_SUCH_ENTRY;
}

static
int lb_vip_port_find_index_with_lock(ip46_address_t *prefix, u8 plen,
                                     u8 protocol, u16 port, u32 *vip_index)
{
  return lb_vip_port_find_index(prefix, plen, protocol, port,
                                LB_LKP_SAME_IP_PORT, vip_index);
}

static
int lb_vip_port_find_all_port_vip(ip46_address_t *prefix, u8 plen,
                                  u32 *vip_index)
{
  return lb_vip_port_find_index(prefix, plen, ~0, 0,
                                LB_LKP_ALL_PORT_IP, vip_index);
}

/* Find out per-port-vip entry with different protocol and port */
static
int lb_vip_port_find_diff_port(ip46_address_t *prefix, u8 plen,
                               u8 protocol, u16 port, u32 *vip_index)
{
  return lb_vip_port_find_index(prefix, plen, protocol, port,
                                LB_LKP_DIFF_IP_PORT, vip_index);
}

int lb_vip_find_index(ip46_address_t *prefix, u8 plen, u8 protocol,
                      u16 port, u32 *vip_index)
{
  int ret;
  lb_get_writer_lock();
  ret = lb_vip_port_find_index_with_lock(prefix, plen,
                                         protocol, port, vip_index);
  lb_put_writer_lock();
  return ret;
}

static int lb_as_find_index_vip(lb_vip_t *vip, ip46_address_t *address, u32 *as_index)
{
  lb_main_t *lbm = &lb_main;
  /* This must be called with the lock owned */
  CLIB_SPINLOCK_ASSERT_LOCKED (&lbm->writer_lock);
  lb_as_t *as;
  u32 *asi;
  pool_foreach(asi, vip->as_indexes, {
      as = &lbm->ass[*asi];
      if (as->vip_index == (vip - lbm->vips) &&
          as->address.as_u64[0] == address->as_u64[0] &&
          as->address.as_u64[1] == address->as_u64[1])
      {
        *as_index = as - lbm->ass;
        return 0;
      }
  });
  return -1;
}

int lb_vip_add_ass(u32 vip_index, ip46_address_t *addresses, u32 n)
{
  lb_main_t *lbm = &lb_main;
  lb_get_writer_lock();
  lb_vip_t *vip;
  if (!(vip = lb_vip_get_by_index(vip_index))) {
    lb_put_writer_lock();
    return VNET_API_ERROR_NO_SUCH_ENTRY;
  }

  ip46_type_t type = lb_encap_is_ip4(vip)?IP46_TYPE_IP4:IP46_TYPE_IP6;
  u32 *to_be_added = 0;
  u32 *to_be_updated = 0;
  u32 i;
  u32 *ip;
  lb_snat_mapping_t *m;

  //Sanity check
  while (n--) {

    if (!lb_as_find_index_vip(vip, &addresses[n], &i)) {
      if (lbm->ass[i].flags & LB_AS_FLAGS_USED) {
        vec_free(to_be_added);
        vec_free(to_be_updated);
        lb_put_writer_lock();
        return VNET_API_ERROR_VALUE_EXIST;
      }
      vec_add1(to_be_updated, i);
      goto next;
    }

    if (ip46_address_type(&addresses[n]) != type) {
      vec_free(to_be_added);
      vec_free(to_be_updated);
      lb_put_writer_lock();
      return VNET_API_ERROR_INVALID_ADDRESS_FAMILY;
    }

    if (n) {
      u32 n2 = n;
      while(n2--) //Check for duplicates
        if (addresses[n2].as_u64[0] == addresses[n].as_u64[0] &&
            addresses[n2].as_u64[1] == addresses[n].as_u64[1])
          goto next;
    }

    vec_add1(to_be_added, n);

next:
    continue;
  }

  //Update reused ASs
  vec_foreach(ip, to_be_updated) {
    lbm->ass[*ip].flags = LB_AS_FLAGS_USED;
  }
  vec_free(to_be_updated);

  //Create those who have to be created
  vec_foreach(ip, to_be_added) {
    lb_as_t *as;
    u32 *as_index;
    pool_get(lbm->ass, as);
    as->address = addresses[*ip];
    as->flags = LB_AS_FLAGS_USED;
    as->vip_index = vip_index;
    pool_get(vip->as_indexes, as_index);
    *as_index = as - lbm->ass;

    /*
     * become a child of the FIB entry
     * so we are informed when its forwarding changes
     */
    fib_prefix_t nh = {};
    if (lb_encap_is_ip4(vip)) {
        nh.fp_addr.ip4 = as->address.ip4;
        nh.fp_len = 32;
        nh.fp_proto = FIB_PROTOCOL_IP4;
    } else {
        nh.fp_addr.ip6 = as->address.ip6;
        nh.fp_len = 128;
        nh.fp_proto = FIB_PROTOCOL_IP6;
    }

    as->next_hop_fib_entry_index =
        fib_table_entry_special_add(0,
                                    &nh,
                                    FIB_SOURCE_RR,
                                    FIB_ENTRY_FLAG_NONE);
    as->next_hop_child_index =
        fib_entry_child_add(as->next_hop_fib_entry_index,
                            lbm->fib_node_type,
                            as - lbm->ass);

    lb_as_stack(as);

    if ( lb_vip_is_nat4_port(vip) || lb_vip_is_nat6_port(vip) )
      {
        /* Add SNAT static mapping */
        pool_get (lbm->snat_mappings, m);
        clib_memset (m, 0, sizeof (*m));
        if (lb_vip_is_nat4_port(vip)) {
            lb_snat4_key_t m_key4;
            clib_bihash_kv_8_8_t kv4;
            m_key4.addr = as->address.ip4;
            m_key4.port = vip->encap_args.target_port;
            m_key4.protocol = 0;
            m_key4.fib_index = 0;

            if (vip->encap_args.srv_type == LB_SRV_TYPE_CLUSTERIP)
              {
                m->src_ip.ip4 = vip->prefix.ip4;
              }
            else if (vip->encap_args.srv_type == LB_SRV_TYPE_NODEPORT)
              {
                m->src_ip.ip4 = lbm->ip4_src_address;
              }
            m->src_ip_is_ipv6 = 0;
            m->as_ip.ip4 = as->address.ip4;
            m->as_ip_is_ipv6 = 0;
            m->src_port = vip->port;
            m->target_port = vip->encap_args.target_port;
            m->vrf_id = 0;
            m->fib_index = 0;

            kv4.key = m_key4.as_u64;
            kv4.value = m - lbm->snat_mappings;
            clib_bihash_add_del_8_8(&lbm->mapping_by_as4, &kv4, 1);
        } else {
            lb_snat6_key_t m_key6;
            clib_bihash_kv_24_8_t kv6;
            m_key6.addr.as_u64[0] = as->address.ip6.as_u64[0];
            m_key6.addr.as_u64[1] = as->address.ip6.as_u64[1];
            m_key6.port = vip->encap_args.target_port;
            m_key6.protocol = 0;
            m_key6.fib_index = 0;

            if (vip->encap_args.srv_type == LB_SRV_TYPE_CLUSTERIP)
              {
                m->src_ip.ip6.as_u64[0] = vip->prefix.ip6.as_u64[0];
                m->src_ip.ip6.as_u64[1] = vip->prefix.ip6.as_u64[1];
              }
            else if (vip->encap_args.srv_type == LB_SRV_TYPE_NODEPORT)
              {
                m->src_ip.ip6.as_u64[0] = lbm->ip6_src_address.as_u64[0];
                m->src_ip.ip6.as_u64[1] = lbm->ip6_src_address.as_u64[1];
              }
            m->src_ip_is_ipv6 = 1;
            m->as_ip.ip6.as_u64[0] = as->address.ip6.as_u64[0];
            m->as_ip.ip6.as_u64[1] = as->address.ip6.as_u64[1];
            m->as_ip_is_ipv6 = 1;
            m->src_port = vip->port;
            m->target_port = vip->encap_args.target_port;
            m->vrf_id = 0;
            m->fib_index = 0;

            kv6.key[0] = m_key6.as_u64[0];
            kv6.key[1] = m_key6.as_u64[1];
            kv6.key[2] = m_key6.as_u64[2];
            kv6.value = m - lbm->snat_mappings;
            clib_bihash_add_del_24_8(&lbm->mapping_by_as6, &kv6, 1);
        }
      }
  }
  vec_free(to_be_added);

  //Recompute flows
  lb_vip_update_new_flow_table(vip);

  //Garbage collection maybe
  lb_vip_garbage_collection(vip);

  lb_put_writer_lock();
  return 0;
}

int
lb_flush_vip_as (u32 vip_index, u32 as_index)
{
  u32 thread_index;
  vlib_thread_main_t *tm = vlib_get_thread_main();
  lb_main_t *lbm = &lb_main;

  for(thread_index = 0; thread_index < tm->n_vlib_mains; thread_index++ ) {
    lb_hash_t *h = lbm->per_cpu[thread_index].sticky_ht;
    if (h != NULL) {
        u32 i;
        lb_hash_bucket_t *b;

        lb_hash_foreach_entry(h, b, i) {
          if ((vip_index == ~0)
              || ((b->vip[i] == vip_index) && (as_index == ~0))
              || ((b->vip[i] == vip_index) && (b->value[i] == as_index)))
            {
              vlib_refcount_add(&lbm->as_refcount, thread_index, b->value[i], -1);
              vlib_refcount_add(&lbm->as_refcount, thread_index, 0, 1);
              b->vip[i] = ~0;
              b->value[i] = 0;
            }
        }
        if (vip_index == ~0)
          {
            lb_hash_free(h);
            lbm->per_cpu[thread_index].sticky_ht = 0;
          }
      }
    }

  return 0;
}

int lb_vip_del_ass_withlock(u32 vip_index, ip46_address_t *addresses, u32 n,
                            u8 flush)
{
  lb_main_t *lbm = &lb_main;
  u32 now = (u32) vlib_time_now(vlib_get_main());
  u32 *ip = 0;
  u32 as_index = 0;

  lb_vip_t *vip;
  if (!(vip = lb_vip_get_by_index(vip_index))) {
    return VNET_API_ERROR_NO_SUCH_ENTRY;
  }

  u32 *indexes = NULL;
  while (n--) {
    if (lb_as_find_index_vip(vip, &addresses[n], &as_index)) {
      vec_free(indexes);
      return VNET_API_ERROR_NO_SUCH_ENTRY;
    }

    if (n) { //Check for duplicates
      u32 n2 = n - 1;
      while(n2--) {
        if (addresses[n2].as_u64[0] == addresses[n].as_u64[0] &&
            addresses[n2].as_u64[1] == addresses[n].as_u64[1])
          goto next;
      }
    }

    vec_add1(indexes, as_index);
next:
  continue;
  }

  //Garbage collection maybe
  lb_vip_garbage_collection(vip);

  if (indexes != NULL) {
    vec_foreach(ip, indexes) {
      lbm->ass[*ip].flags &= ~LB_AS_FLAGS_USED;
      lbm->ass[*ip].last_used = now;

      if(flush)
        {
          /* flush flow table for deleted ASs*/
          lb_flush_vip_as(vip_index, *ip);
        }
    }

    //Recompute flows
    lb_vip_update_new_flow_table(vip);
  }

  vec_free(indexes);
  return 0;
}

int lb_vip_del_ass(u32 vip_index, ip46_address_t *addresses, u32 n, u8 flush)
{
  lb_get_writer_lock();
  int ret = lb_vip_del_ass_withlock(vip_index, addresses, n, flush);
  lb_put_writer_lock();

  return ret;
}

static int
lb_vip_prefix_index_alloc (lb_main_t *lbm)
{
  /*
   * Check for dynamically allocated instance number.
   */
  u32 bit;

  bit = clib_bitmap_first_clear (lbm->vip_prefix_indexes);

  lbm->vip_prefix_indexes = clib_bitmap_set(lbm->vip_prefix_indexes, bit, 1);

  return bit;
}

static int
lb_vip_prefix_index_free (lb_main_t *lbm, u32 instance)
{

  if (clib_bitmap_get (lbm->vip_prefix_indexes, instance) == 0)
    {
      return -1;
    }

  lbm->vip_prefix_indexes = clib_bitmap_set (lbm->vip_prefix_indexes,
                                             instance, 0);

  return 0;
}

/**
 * Add the VIP adjacency to the ip4 or ip6 fib
 */
static void lb_vip_add_adjacency(lb_main_t *lbm, lb_vip_t *vip,
                                 u32 *vip_prefix_index)
{
  dpo_proto_t proto = 0;
  dpo_type_t dpo_type = 0;
  u32 vip_idx = 0;

  if (vip->port != 0)
    {
      /* for per-port vip, if VIP adjacency has been added,
       * no need to add adjacency. */
      if (!lb_vip_port_find_diff_port(&(vip->prefix), vip->plen,
                                      vip->protocol, vip->port, &vip_idx))
        {
          lb_vip_t *exists_vip = lb_vip_get_by_index(vip_idx);
          *vip_prefix_index = exists_vip ? exists_vip->vip_prefix_index : ~0;
          return;
        }

      /* Allocate an index for per-port vip */
      *vip_prefix_index = lb_vip_prefix_index_alloc(lbm);
    }
  else
    {
      *vip_prefix_index = vip - lbm->vips;
    }

  dpo_id_t dpo = DPO_INVALID;
  fib_prefix_t pfx = {};
  if (lb_vip_is_ip4(vip->type)) {
      pfx.fp_addr.ip4 = vip->prefix.ip4;
      pfx.fp_len = vip->plen - 96;
      pfx.fp_proto = FIB_PROTOCOL_IP4;
      proto = DPO_PROTO_IP4;
  } else {
      pfx.fp_addr.ip6 = vip->prefix.ip6;
      pfx.fp_len = vip->plen;
      pfx.fp_proto = FIB_PROTOCOL_IP6;
      proto = DPO_PROTO_IP6;
  }

  if (lb_vip_is_gre4(vip))
    dpo_type = lbm->dpo_gre4_type;
  else if (lb_vip_is_gre6(vip))
    dpo_type = lbm->dpo_gre6_type;
  else if (lb_vip_is_gre4_port(vip))
    dpo_type = lbm->dpo_gre4_port_type;
  else if (lb_vip_is_gre6_port(vip))
    dpo_type = lbm->dpo_gre6_port_type;
  else if (lb_vip_is_l3dsr(vip))
    dpo_type = lbm->dpo_l3dsr_type;
  else if (lb_vip_is_l3dsr_port(vip))
    dpo_type = lbm->dpo_l3dsr_port_type;
  else if(lb_vip_is_nat4_port(vip))
    dpo_type = lbm->dpo_nat4_port_type;
  else if (lb_vip_is_nat6_port(vip))
    dpo_type = lbm->dpo_nat6_port_type;

  dpo_set(&dpo, dpo_type, proto, *vip_prefix_index);
  fib_table_entry_special_dpo_add(0,
                                  &pfx,
                                  lb_fib_src,
                                  FIB_ENTRY_FLAG_EXCLUSIVE,
                                  &dpo);
  dpo_reset(&dpo);
}

/**
 * Add the VIP filter entry
 */
static int lb_vip_add_port_filter(lb_main_t *lbm, lb_vip_t *vip,
                                  u32 vip_prefix_index, u32 vip_idx)
{
  vip_port_key_t key;
  clib_bihash_kv_8_8_t kv;

  key.vip_prefix_index = vip_prefix_index;
  key.protocol = vip->protocol;
  key.port = clib_host_to_net_u16(vip->port);
  key.rsv = 0;

  kv.key = key.as_u64;
  kv.value = vip_idx;
  clib_bihash_add_del_8_8(&lbm->vip_index_per_port, &kv, 1);

  return 0;
}

/**
 * Del the VIP filter entry
 */
static int lb_vip_del_port_filter(lb_main_t *lbm, lb_vip_t *vip)
{
  vip_port_key_t key;
  clib_bihash_kv_8_8_t kv, value;
  lb_vip_t *m = 0;

  key.vip_prefix_index = vip->vip_prefix_index;
  key.protocol = vip->protocol;
  key.port = clib_host_to_net_u16(vip->port);
  key.rsv = 0;

  kv.key = key.as_u64;
  if(clib_bihash_search_8_8(&lbm->vip_index_per_port, &kv, &value) != 0)
    {
      clib_warning("looking up vip_index_per_port failed.");
      return VNET_API_ERROR_NO_SUCH_ENTRY;
    }
  m = pool_elt_at_index (lbm->vips, value.value);
  ASSERT (m);

  kv.value = m - lbm->vips;
  clib_bihash_add_del_8_8(&lbm->vip_index_per_port, &kv, 0);

  return 0;
}

/**
 * Deletes the adjacency associated with the VIP
 */
static void lb_vip_del_adjacency(lb_main_t *lbm, lb_vip_t *vip)
{
  fib_prefix_t pfx = {};
  u32 vip_idx = 0;

  if (vip->port != 0)
    {
      /* If this vip adjacency is used by other per-port vip,
       * no need to del this adjacency. */
      if (!lb_vip_port_find_diff_port(&(vip->prefix), vip->plen,
                                      vip->protocol, vip->port, &vip_idx))
        {
          lb_put_writer_lock();
          return;
        }

      /* Return vip_prefix_index for per-port vip */
      lb_vip_prefix_index_free(lbm, vip->vip_prefix_index);

    }

  if (lb_vip_is_ip4(vip->type)) {
      pfx.fp_addr.ip4 = vip->prefix.ip4;
      pfx.fp_len = vip->plen - 96;
      pfx.fp_proto = FIB_PROTOCOL_IP4;
  } else {
      pfx.fp_addr.ip6 = vip->prefix.ip6;
      pfx.fp_len = vip->plen;
      pfx.fp_proto = FIB_PROTOCOL_IP6;
  }
  fib_table_entry_special_remove(0, &pfx, lb_fib_src);
}

int lb_vip_add(lb_vip_add_args_t args, u32 *vip_index)
{
  lb_main_t *lbm = &lb_main;
  vlib_main_t *vm = vlib_get_main();
  lb_vip_t *vip;
  lb_vip_type_t type = args.type;
  u32 vip_prefix_index = 0;

  lb_get_writer_lock();
  ip46_prefix_normalize(&(args.prefix), args.plen);

  if (!lb_vip_port_find_index_with_lock(&(args.prefix), args.plen,
                                         args.protocol, args.port,
                                         vip_index))
    {
      lb_put_writer_lock();
      return VNET_API_ERROR_VALUE_EXIST;
    }

  /* Make sure we can't add a per-port VIP entry
   * when there already is an all-port VIP for the same prefix. */
  if ((args.port != 0) &&
      !lb_vip_port_find_all_port_vip(&(args.prefix), args.plen, vip_index))
    {
      lb_put_writer_lock();
      return VNET_API_ERROR_VALUE_EXIST;
    }

  /* Make sure we can't add a all-port VIP entry
   * when there already is an per-port VIP for the same prefix. */
  if ((args.port == 0) &&
      !lb_vip_port_find_diff_port(&(args.prefix), args.plen,
                                  args.protocol, args.port, vip_index))
    {
      lb_put_writer_lock();
      return VNET_API_ERROR_VALUE_EXIST;
    }

  /* Make sure all VIP for a given prefix (using different ports) have the same type. */
  if ((args.port != 0) &&
      !lb_vip_port_find_diff_port(&(args.prefix), args.plen,
                                  args.protocol, args.port, vip_index)
      && (args.type != lbm->vips[*vip_index].type))
    {
      lb_put_writer_lock();
      return VNET_API_ERROR_INVALID_ARGUMENT;
    }

  if (!is_pow2(args.new_length)) {
    lb_put_writer_lock();
    return VNET_API_ERROR_INVALID_MEMORY_SIZE;
  }

  if (ip46_prefix_is_ip4(&(args.prefix), args.plen) &&
      !lb_vip_is_ip4(type)) {
    lb_put_writer_lock();
    return VNET_API_ERROR_INVALID_ADDRESS_FAMILY;
  }

  if ((!ip46_prefix_is_ip4(&(args.prefix), args.plen)) &&
      !lb_vip_is_ip6(type)) {
    lb_put_writer_lock();
    return VNET_API_ERROR_INVALID_ADDRESS_FAMILY;
  }

  if ((type == LB_VIP_TYPE_IP4_L3DSR) &&
      (args.encap_args.dscp >= 64) )
    {
      lb_put_writer_lock();
      return VNET_API_ERROR_VALUE_EXIST;
    }

  //Allocate
  pool_get(lbm->vips, vip);

  //Init
  memcpy (&(vip->prefix), &(args.prefix), sizeof(args.prefix));
  vip->plen = args.plen;
  if (args.port != 0)
    {
      vip->protocol = args.protocol;
      vip->port = args.port;
    }
  else
    {
      vip->protocol = (u8)~0;
      vip->port = 0;
    }
  vip->last_garbage_collection = (u32) vlib_time_now(vlib_get_main());
  vip->type = args.type;

  if (args.type == LB_VIP_TYPE_IP4_L3DSR) {
      vip->encap_args.dscp = args.encap_args.dscp;
    }
  else if ((args.type == LB_VIP_TYPE_IP4_NAT4)
           ||(args.type == LB_VIP_TYPE_IP6_NAT6)) {
      vip->encap_args.srv_type = args.encap_args.srv_type;
      vip->encap_args.target_port =
          clib_host_to_net_u16(args.encap_args.target_port);
    }

  vip->flags = LB_VIP_FLAGS_USED;
  vip->as_indexes = 0;

  //Validate counters
  u32 i;
  for (i = 0; i < LB_N_VIP_COUNTERS; i++) {
    vlib_validate_simple_counter(&lbm->vip_counters[i], vip - lbm->vips);
    vlib_zero_simple_counter(&lbm->vip_counters[i], vip - lbm->vips);
  }

  //Configure new flow table
  vip->new_flow_table_mask = args.new_length - 1;
  vip->new_flow_table = 0;

  //Update flow hash table
  lb_vip_update_new_flow_table(vip);

  //Create adjacency to direct traffic
  lb_vip_add_adjacency(lbm, vip, &vip_prefix_index);

  if ( (lb_vip_is_nat4_port(vip) || lb_vip_is_nat6_port(vip))
      && (args.encap_args.srv_type == LB_SRV_TYPE_NODEPORT) )
    {
      u32 key;
      uword * entry;

      //Create maping from nodeport to vip_index
      key = clib_host_to_net_u16(args.port);
      entry = hash_get_mem (lbm->vip_index_by_nodeport, &key);
      if (entry) {
        lb_put_writer_lock();
        return VNET_API_ERROR_VALUE_EXIST;
      }

      hash_set_mem (lbm->vip_index_by_nodeport, &key, vip - lbm->vips);

      /* receive packets destined to NodeIP:NodePort */
      udp_register_dst_port (vm, args.port, lb4_nodeport_node.index, 1);
      udp_register_dst_port (vm, args.port, lb6_nodeport_node.index, 0);
    }

  *vip_index = vip - lbm->vips;
  //Create per-port vip filtering table
  if (args.port != 0)
    {
      lb_vip_add_port_filter(lbm, vip, vip_prefix_index, *vip_index);
      vip->vip_prefix_index = vip_prefix_index;
    }

  lb_put_writer_lock();
  return 0;
}

int lb_vip_del(u32 vip_index)
{
  lb_main_t *lbm = &lb_main;
  lb_vip_t *vip;
  int rv = 0;

  /* Does not remove default vip, i.e. vip_index = 0 */
  if (vip_index == 0)
    return VNET_API_ERROR_INVALID_VALUE;

  lb_get_writer_lock();
  if (!(vip = lb_vip_get_by_index(vip_index))) {
    lb_put_writer_lock();
    return VNET_API_ERROR_NO_SUCH_ENTRY;
  }

  //FIXME: This operation is actually not working
  //We will need to remove state before performing this.

  {
    //Remove all ASs
    ip46_address_t *ass = 0;
    lb_as_t *as;
    u32 *as_index;

    pool_foreach(as_index, vip->as_indexes, {
        as = &lbm->ass[*as_index];
        vec_add1(ass, as->address);
    });
    if (vec_len(ass))
      lb_vip_del_ass_withlock(vip_index, ass, vec_len(ass), 0);
    vec_free(ass);
  }

  //Delete adjacency
  lb_vip_del_adjacency(lbm, vip);

  //Delete per-port vip filtering entry
  if (vip->port != 0)
    {
      rv = lb_vip_del_port_filter(lbm, vip);
    }

  //Set the VIP as unused
  vip->flags &= ~LB_VIP_FLAGS_USED;

  lb_put_writer_lock();
  return rv;
}

/* *INDENT-OFF* */
VLIB_PLUGIN_REGISTER () = {
    .version = VPP_BUILD_VER,
    .description = "Load Balancer (LB)",
};
/* *INDENT-ON* */

u8 *format_lb_dpo (u8 * s, va_list * va)
{
  index_t index = va_arg (*va, index_t);
  CLIB_UNUSED(u32 indent) = va_arg (*va, u32);
  lb_main_t *lbm = &lb_main;
  lb_vip_t *vip = pool_elt_at_index (lbm->vips, index);
  return format (s, "%U", format_lb_vip, vip);
}

static void lb_dpo_lock (dpo_id_t *dpo) {}
static void lb_dpo_unlock (dpo_id_t *dpo) {}

static fib_node_t *
lb_fib_node_get_node (fib_node_index_t index)
{
  lb_main_t *lbm = &lb_main;
  lb_as_t *as = pool_elt_at_index (lbm->ass, index);
  return (&as->fib_node);
}

static void
lb_fib_node_last_lock_gone (fib_node_t *node)
{
}

static lb_as_t *
lb_as_from_fib_node (fib_node_t *node)
{
  return ((lb_as_t*)(((char*)node) -
      STRUCT_OFFSET_OF(lb_as_t, fib_node)));
}

static void
lb_as_stack (lb_as_t *as)
{
  lb_main_t *lbm = &lb_main;
  lb_vip_t *vip = &lbm->vips[as->vip_index];
  dpo_type_t dpo_type = 0;

  if (lb_vip_is_gre4(vip))
    dpo_type = lbm->dpo_gre4_type;
  else if (lb_vip_is_gre6(vip))
    dpo_type = lbm->dpo_gre6_type;
  else if (lb_vip_is_gre4_port(vip))
    dpo_type = lbm->dpo_gre4_port_type;
  else if (lb_vip_is_gre6_port(vip))
    dpo_type = lbm->dpo_gre6_port_type;
  else if (lb_vip_is_l3dsr(vip))
    dpo_type = lbm->dpo_l3dsr_type;
  else if (lb_vip_is_l3dsr_port(vip))
    dpo_type = lbm->dpo_l3dsr_port_type;
  else if(lb_vip_is_nat4_port(vip))
    dpo_type = lbm->dpo_nat4_port_type;
  else if (lb_vip_is_nat6_port(vip))
    dpo_type = lbm->dpo_nat6_port_type;

  dpo_stack(dpo_type,
            lb_vip_is_ip4(vip->type)?DPO_PROTO_IP4:DPO_PROTO_IP6,
            &as->dpo,
            fib_entry_contribute_ip_forwarding(
                as->next_hop_fib_entry_index));
}

static fib_node_back_walk_rc_t
lb_fib_node_back_walk_notify (fib_node_t *node,
                 fib_node_back_walk_ctx_t *ctx)
{
    lb_as_stack(lb_as_from_fib_node(node));
    return (FIB_NODE_BACK_WALK_CONTINUE);
}

int lb_nat4_interface_add_del (u32 sw_if_index, int is_del)
{
  if (is_del)
    {
      vnet_feature_enable_disable ("ip4-unicast", "lb-nat4-in2out",
                                   sw_if_index, 0, 0, 0);
    }
  else
    {
      vnet_feature_enable_disable ("ip4-unicast", "lb-nat4-in2out",
                                   sw_if_index, 1, 0, 0);
    }

  return 0;
}

int lb_nat6_interface_add_del (u32 sw_if_index, int is_del)
{
  if (is_del)
    {
      vnet_feature_enable_disable ("ip6-unicast", "lb-nat6-in2out",
                                   sw_if_index, 0, 0, 0);
    }
  else
    {
      vnet_feature_enable_disable ("ip6-unicast", "lb-nat6-in2out",
                                   sw_if_index, 1, 0, 0);
    }

  return 0;
}

clib_error_t *
lb_init (vlib_main_t * vm)
{
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  lb_main_t *lbm = &lb_main;
  lbm->vnet_main = vnet_get_main ();
  lbm->vlib_main = vm;

  lb_vip_t *default_vip;
  lb_as_t *default_as;
  fib_node_vft_t lb_fib_node_vft = {
      .fnv_get = lb_fib_node_get_node,
      .fnv_last_lock = lb_fib_node_last_lock_gone,
      .fnv_back_walk = lb_fib_node_back_walk_notify,
  };
  dpo_vft_t lb_vft = {
      .dv_lock = lb_dpo_lock,
      .dv_unlock = lb_dpo_unlock,
      .dv_format = format_lb_dpo,
  };

  //Allocate and init default VIP.
  lbm->vips = 0;
  pool_get(lbm->vips, default_vip);
  default_vip->new_flow_table_mask = 0;
  default_vip->prefix.ip6.as_u64[0] = 0xffffffffffffffffL;
  default_vip->prefix.ip6.as_u64[1] = 0xffffffffffffffffL;
  default_vip->protocol = ~0;
  default_vip->port = 0;
  default_vip->flags = LB_VIP_FLAGS_USED;

  lbm->per_cpu = 0;
  vec_validate(lbm->per_cpu, tm->n_vlib_mains - 1);
  clib_spinlock_init (&lbm->writer_lock);
  lbm->per_cpu_sticky_buckets = LB_DEFAULT_PER_CPU_STICKY_BUCKETS;
  lbm->flow_timeout = LB_DEFAULT_FLOW_TIMEOUT;
  lbm->ip4_src_address.as_u32 = 0xffffffff;
  lbm->ip6_src_address.as_u64[0] = 0xffffffffffffffffL;
  lbm->ip6_src_address.as_u64[1] = 0xffffffffffffffffL;
  lbm->dpo_gre4_type = dpo_register_new_type(&lb_vft, lb_dpo_gre4_nodes);
  lbm->dpo_gre6_type = dpo_register_new_type(&lb_vft, lb_dpo_gre6_nodes);
  lbm->dpo_gre4_port_type = dpo_register_new_type(&lb_vft,
                                                  lb_dpo_gre4_port_nodes);
  lbm->dpo_gre6_port_type = dpo_register_new_type(&lb_vft,
                                                  lb_dpo_gre6_port_nodes);
  lbm->dpo_l3dsr_type = dpo_register_new_type(&lb_vft,
                                              lb_dpo_l3dsr_nodes);
  lbm->dpo_l3dsr_port_type = dpo_register_new_type(&lb_vft,
                                                   lb_dpo_l3dsr_port_nodes);
  lbm->dpo_nat4_port_type = dpo_register_new_type(&lb_vft,
                                                  lb_dpo_nat4_port_nodes);
  lbm->dpo_nat6_port_type = dpo_register_new_type(&lb_vft,
                                                  lb_dpo_nat6_port_nodes);
  lbm->fib_node_type = fib_node_register_new_type(&lb_fib_node_vft);

  //Init AS reference counters
  vlib_refcount_init(&lbm->as_refcount);

  //Allocate and init default AS.
  lbm->ass = 0;
  pool_get(lbm->ass, default_as);
  default_as->flags = 0;
  default_as->dpo.dpoi_next_node = LB_NEXT_DROP;
  default_as->vip_index = ~0;
  default_as->address.ip6.as_u64[0] = 0xffffffffffffffffL;
  default_as->address.ip6.as_u64[1] = 0xffffffffffffffffL;

  /* Generate a valid flow table for default VIP */
  default_vip->as_indexes = NULL;
  lb_get_writer_lock();
  lb_vip_update_new_flow_table(default_vip);
  lb_put_writer_lock();

  lbm->vip_index_by_nodeport
    = hash_create_mem (0, sizeof(u16), sizeof (uword));

  clib_bihash_init_8_8 (&lbm->vip_index_per_port,
                        "vip_index_per_port", LB_VIP_PER_PORT_BUCKETS,
                        LB_VIP_PER_PORT_MEMORY_SIZE);

  clib_bihash_init_8_8 (&lbm->mapping_by_as4,
                        "mapping_by_as4", LB_MAPPING_BUCKETS,
                        LB_MAPPING_MEMORY_SIZE);

  clib_bihash_init_24_8 (&lbm->mapping_by_as6,
                        "mapping_by_as6", LB_MAPPING_BUCKETS,
                        LB_MAPPING_MEMORY_SIZE);

#define _(a,b,c) lbm->vip_counters[c].name = b;
  lb_foreach_vip_counter
#undef _

  lb_fib_src = fib_source_allocate("lb",
                                   FIB_SOURCE_PRIORITY_HI,
                                   FIB_SOURCE_BH_SIMPLE);

  return NULL;
}

VLIB_INIT_FUNCTION (lb_init);