summaryrefslogtreecommitdiffstats
path: root/src/vnet/vxlan-gpe/decap.c
blob: 035e8a3fd6af2e006517d4eef749dbac9d9d184c (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<
# Copyright (c) 2018 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.

option(VPP_BUFFER_FAULT_INJECTOR "Include the buffer fault injector" OFF)

##############################################################################
# Generate vlib/config.h
##############################################################################
if(VPP_BUFFER_FAULT_INJECTOR)
  set(BUFFER_ALLOC_FAULT_INJECTOR 1 CACHE STRING "fault injector on")
else()
  set(BUFFER_ALLOC_FAULT_INJECTOR 0 CACHE STRING "fault injector off")
endif()

set(PRE_DATA_SIZE 128 CACHE STRING "Buffer headroom size.")

if (CMAKE_BUILD_TYPE_UC STREQUAL "DEBUG")
  set(_ss 16)
else()
  set(_ss 15)
endif()
set(VLIB_PROCESS_LOG2_STACK_SIZE
 ${_ss}
 CACHE
 STRING "Process node default stack size (log2)"
)

configure_file(
  ${CMAKE_SOURCE_DIR}/vlib/config.h.in
  ${CMAKE_CURRENT_BINARY_DIR}/config.h
)
install(
  FILES ${CMAKE_CURRENT_BINARY_DIR}/config.h
  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/vlib
  COMPONENT vpp-dev
)

##############################################################################
# Find lib and include files
##############################################################################
message(STATUS "Looking for libuuid")
vpp_find_path(UUID_INCLUDE_DIR NAMES uuid/uuid.h)
vpp_find_library(UUID_LIB NAMES uuid)

if(UUID_INCLUDE_DIR AND UUID_LIB)
  include_directories(${UUID_INCLUDE_DIR})
  set(VMBUS_SOURCE linux/vmbus.c)
  set(VMBUS_LIBS uuid)
  message(STATUS "Found uuid in ${UUID_INCLUDE_DIR}")
else()
  message(WARNING "-- libuuid not found - vmbus support disabled")
endif()

##############################################################################
# vlib shared library
##############################################################################
add_vpp_library(vlib
  SOURCES
  buffer.c
  buffer_funcs.c
  cli.c
  counter.c
  drop.c
  error.c
  format.c
  handoff_trace.c
  init.c
  linux/pci.c
  linux/vfio.c
  log.c
  main.c
  node.c
  node_cli.c
  node_format.c
  node_init.c
  pci/pci.c
  pci/pci_types_api.c
  physmem.c
  punt.c
  punt_node.c
  threads.c
  threads_cli.c
  trace.c
  unix/cli.c
  unix/input.c
  unix/main.c
  unix/plugin.c
  unix/util.c
  vmbus/vmbus.c
  ${VMBUS_SOURCE}

  MULTIARCH_SOURCES
  buffer_funcs.c
  drop.c
  punt_node.c
  node_init.c

  INSTALL_HEADERS
  buffer_funcs.h
  buffer.h
  buffer_node.h
  cli.h
  counter.h
  counter_types.h
  defs.h
  error_funcs.h
  error.h
  format_funcs.h
  global_funcs.h
  init.h
  linux/vfio.h
  log.h
  main.h
  node_funcs.h
  node.h
  pci/pci_config.h
  pci/pci.h
  pci/pci_types_api.h
  physmem_funcs.h
  physmem.h
  punt.h
  threads.h
  trace_funcs.h
  trace.h
  unix/mc_socket.h
  unix/plugin.h
  unix/unix.h
  vlib.h
  vmbus/vmbus.h

  API_FILES
  pci/pci_types.api

  LINK_LIBRARIES vppinfra svm ${VMBUS_LIBS} ${CMAKE_DL_LIBS}

  DEPENDS api_headers
)
ref='#n535'>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
/*
 * decap.c - decapsulate VXLAN GPE
 *
 * Copyright (c) 2013 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.
 */
/**
 *  @file
 *  @brief Functions for decapsulating VXLAN GPE tunnels
 *
*/

#include <vlib/vlib.h>
#include <vnet/udp/udp_local.h>
#include <vnet/vxlan-gpe/vxlan_gpe.h>

/**
 * @brief Struct for VXLAN GPE decap packet tracing
 *
 */
typedef struct
{
  u32 next_index;
  u32 tunnel_index;
  u32 error;
} vxlan_gpe_rx_trace_t;

/**
 * @brief Tracing function for VXLAN GPE packet decapsulation
 *
 * @param *s
 * @param *args
 *
 * @return *s
 *
 */
static u8 *
format_vxlan_gpe_rx_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 *);
  vxlan_gpe_rx_trace_t *t = va_arg (*args, vxlan_gpe_rx_trace_t *);

  if (t->tunnel_index != ~0)
    {
      s = format (s, "VXLAN-GPE: tunnel %d next %d error %d", t->tunnel_index,
		  t->next_index, t->error);
    }
  else
    {
      s = format (s, "VXLAN-GPE: no tunnel next %d error %d\n", t->next_index,
		  t->error);
    }
  return s;
}

/**
 * @brief Tracing function for VXLAN GPE packet decapsulation including length
 *
 * @param *s
 * @param *args
 *
 * @return *s
 *
 */
static u8 *
format_vxlan_gpe_with_length (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 *);


  return s;
}

/**
 * @brief Common processing for IPv4 and IPv6 VXLAN GPE decap dispatch functions
 *
 * It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE
 * tunnels are "terminate local". This means that there is no "TX" interface for this
 * decap case, so that field in the buffer_metadata can be "used for something else".
 * The something else in this case is, for the IPv4/IPv6 inner-packet type case, the
 * FIB index used to look up the inner-packet's adjacency.
 *
 *      vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;
 *
 * @param *vm
 * @param *node
 * @param *from_frame
 * @param is_ip4
 *
 * @return from_frame->n_vectors
 *
 */
always_inline uword
vxlan_gpe_input (vlib_main_t * vm,
		 vlib_node_runtime_t * node,
		 vlib_frame_t * from_frame, u8 is_ip4)
{
  u32 n_left_from, next_index, *from, *to_next;
  vxlan_gpe_main_t *nngm = &vxlan_gpe_main;
  vnet_main_t *vnm = nngm->vnet_main;
  vnet_interface_main_t *im = &vnm->interface_main;
  u32 last_tunnel_index = ~0;
  vxlan4_gpe_tunnel_key_t last_key4;
  vxlan6_gpe_tunnel_key_t last_key6;
  u32 pkts_decapsulated = 0;
  u32 thread_index = vm->thread_index;
  u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;

  if (is_ip4)
    clib_memset (&last_key4, 0xff, sizeof (last_key4));
  else
    clib_memset (&last_key6, 0xff, sizeof (last_key6));

  from = vlib_frame_vector_args (from_frame);
  n_left_from = from_frame->n_vectors;

  next_index = node->cached_next_index;
  stats_sw_if_index = node->runtime_data[0];
  stats_n_packets = stats_n_bytes = 0;

  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 >= 4 && n_left_to_next >= 2)
	{
	  u32 bi0, bi1;
	  vlib_buffer_t *b0, *b1;
	  u32 next0, next1;
	  ip4_vxlan_gpe_header_t *iuvn4_0, *iuvn4_1;
	  ip6_vxlan_gpe_header_t *iuvn6_0, *iuvn6_1;
	  uword *p0, *p1;
	  u32 tunnel_index0, tunnel_index1;
	  vxlan_gpe_tunnel_t *t0, *t1;
	  vxlan4_gpe_tunnel_key_t key4_0, key4_1;
	  vxlan6_gpe_tunnel_key_t key6_0, key6_1;
	  u32 error0, error1;
	  u32 sw_if_index0, sw_if_index1, len0, len1;

	  /* Prefetch next iteration. */
	  {
	    vlib_buffer_t *p2, *p3;

	    p2 = vlib_get_buffer (vm, from[2]);
	    p3 = vlib_get_buffer (vm, from[3]);

	    vlib_prefetch_buffer_header (p2, LOAD);
	    vlib_prefetch_buffer_header (p3, LOAD);

	    CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
	    CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
	  }

	  bi0 = from[0];
	  bi1 = from[1];
	  to_next[0] = bi0;
	  to_next[1] = bi1;
	  from += 2;
	  to_next += 2;
	  n_left_to_next -= 2;
	  n_left_from -= 2;

	  b0 = vlib_get_buffer (vm, bi0);
	  b1 = vlib_get_buffer (vm, bi1);

	  if (is_ip4)
	    {
	      /* udp leaves current_data pointing at the vxlan-gpe header */
	      vlib_buffer_advance (b0,
				   -(word) (sizeof (udp_header_t) +
					    sizeof (ip4_header_t)));
	      vlib_buffer_advance (b1,
				   -(word) (sizeof (udp_header_t) +
					    sizeof (ip4_header_t)));

	      iuvn4_0 = vlib_buffer_get_current (b0);
	      iuvn4_1 = vlib_buffer_get_current (b1);

	      /* pop (ip, udp, vxlan) */
	      vlib_buffer_advance (b0, sizeof (*iuvn4_0));
	      vlib_buffer_advance (b1, sizeof (*iuvn4_1));
	    }
	  else
	    {
	      /* udp leaves current_data pointing at the vxlan-gpe header */
	      vlib_buffer_advance (b0,
				   -(word) (sizeof (udp_header_t) +
					    sizeof (ip6_header_t)));
	      vlib_buffer_advance (b1,
				   -(word) (sizeof (udp_header_t) +
					    sizeof (ip6_header_t)));

	      iuvn6_0 = vlib_buffer_get_current (b0);
	      iuvn6_1 = vlib_buffer_get_current (b1);

	      /* pop (ip, udp, vxlan) */
	      vlib_buffer_advance (b0, sizeof (*iuvn6_0));
	      vlib_buffer_advance (b1, sizeof (*iuvn6_1));
	    }

	  tunnel_index0 = ~0;
	  tunnel_index1 = ~0;
	  error0 = 0;
	  error1 = 0;

	  if (is_ip4)
	    {
	      next0 =
		(iuvn4_0->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
		nngm->decap_next_node_list[iuvn4_0->vxlan.protocol] :
		VXLAN_GPE_INPUT_NEXT_DROP;
	      next1 =
		(iuvn4_1->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
		nngm->decap_next_node_list[iuvn4_1->vxlan.protocol] :
		VXLAN_GPE_INPUT_NEXT_DROP;

	      key4_0.local = iuvn4_0->ip4.dst_address.as_u32;
	      key4_1.local = iuvn4_1->ip4.dst_address.as_u32;

	      key4_0.remote = iuvn4_0->ip4.src_address.as_u32;
	      key4_1.remote = iuvn4_1->ip4.src_address.as_u32;

	      key4_0.vni = iuvn4_0->vxlan.vni_res;
	      key4_1.vni = iuvn4_1->vxlan.vni_res;

	      key4_0.pad = 0;
	      key4_1.pad = 0;
	    }
	  else			/* is_ip6 */
	    {
	      next0 = (iuvn6_0->vxlan.protocol < node->n_next_nodes) ?
		iuvn6_0->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;
	      next1 = (iuvn6_1->vxlan.protocol < node->n_next_nodes) ?
		iuvn6_1->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP;

	      key6_0.local.as_u64[0] = iuvn6_0->ip6.dst_address.as_u64[0];
	      key6_0.local.as_u64[1] = iuvn6_0->ip6.dst_address.as_u64[1];
	      key6_1.local.as_u64[0] = iuvn6_1->ip6.dst_address.as_u64[0];
	      key6_1.local.as_u64[1] = iuvn6_1->ip6.dst_address.as_u64[1];

	      key6_0.remote.as_u64[0] = iuvn6_0->ip6.src_address.as_u64[0];
	      key6_0.remote.as_u64[1] = iuvn6_0->ip6.src_address.as_u64[1];
	      key6_1.remote.as_u64[0] = iuvn6_1->ip6.src_address.as_u64[0];
	      key6_1.remote.as_u64[1] = iuvn6_1->ip6.src_address.as_u64[1];

	      key6_0.vni = iuvn6_0->vxlan.vni_res;
	      key6_1.vni = iuvn6_1->vxlan.vni_res;
	    }

	  /* Processing packet 0 */
	  if (is_ip4)
	    {
	      /* Processing for key4_0 */
	      if (PREDICT_FALSE ((key4_0.as_u64[0] != last_key4.as_u64[0])
				 || (key4_0.as_u64[1] !=
				     last_key4.as_u64[1])))
		{
		  p0 = hash_get_mem (nngm->vxlan4_gpe_tunnel_by_key, &key4_0);

		  if (p0 == 0)
		    {
		      error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
		      goto trace0;
		    }

		  last_key4.as_u64[0] = key4_0.as_u64[0];
		  last_key4.as_u64[1] = key4_0.as_u64[1];
		  tunnel_index0 = last_tunnel_index = p0[0];
		}
	      else
		tunnel_index0 = last_tunnel_index;
	    }
	  else			/* is_ip6 */
	    {
	      next0 =
		(iuvn6_0->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
		nngm->decap_next_node_list[iuvn6_0->vxlan.protocol] :
		VXLAN_GPE_INPUT_NEXT_DROP;
	      next1 =
		(iuvn6_1->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
		nngm->decap_next_node_list[iuvn6_1->vxlan.protocol] :
		VXLAN_GPE_INPUT_NEXT_DROP;

	      key6_0.local.as_u64[0] = iuvn6_0->ip6.dst_address.as_u64[0];
	      key6_0.local.as_u64[1] = iuvn6_0->ip6.dst_address.as_u64[1];
	      key6_1.local.as_u64[0] = iuvn6_1->ip6.dst_address.as_u64[0];
	      key6_1.local.as_u64[1] = iuvn6_1->ip6.dst_address.as_u64[1];

	      key6_0.remote.as_u64[0] = iuvn6_0->ip6.src_address.as_u64[0];
	      key6_0.remote.as_u64[1] = iuvn6_0->ip6.src_address.as_u64[1];
	      key6_1.remote.as_u64[0] = iuvn6_1->ip6.src_address.as_u64[0];
	      key6_1.remote.as_u64[1] = iuvn6_1->ip6.src_address.as_u64[1];

	      key6_0.vni = iuvn6_0->vxlan.vni_res;
	      key6_1.vni = iuvn6_1->vxlan.vni_res;

	      /* Processing for key6_0 */
	      if (PREDICT_FALSE
		  (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
		{
		  p0 = hash_get_mem (nngm->vxlan6_gpe_tunnel_by_key, &key6_0);

		  if (p0 == 0)
		    {
		      error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
		      goto trace0;
		    }

		  memcpy (&last_key6, &key6_0, sizeof (key6_0));
		  tunnel_index0 = last_tunnel_index = p0[0];
		}
	      else
		tunnel_index0 = last_tunnel_index;
	    }

	  t0 = pool_elt_at_index (nngm->tunnels, tunnel_index0);


	  sw_if_index0 = t0->sw_if_index;
	  len0 = vlib_buffer_length_in_chain (vm, b0);

	  /* Required to make the l2 tag push / pop code work on l2 subifs */
	  vnet_update_l2_len (b0);

	  /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
	  vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;

      /**
       * ip[46] lookup in the configured FIB
       */
	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;

	  pkts_decapsulated++;
	  stats_n_packets += 1;
	  stats_n_bytes += len0;

	  if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
	    {
	      stats_n_packets -= 1;
	      stats_n_bytes -= len0;
	      if (stats_n_packets)
		vlib_increment_combined_counter (im->combined_sw_if_counters +
						 VNET_INTERFACE_COUNTER_RX,
						 thread_index,
						 stats_sw_if_index,
						 stats_n_packets,
						 stats_n_bytes);
	      stats_n_packets = 1;
	      stats_n_bytes = len0;
	      stats_sw_if_index = sw_if_index0;
	    }

	trace0:b0->error = error0 ? node->errors[error0] : 0;

	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      vxlan_gpe_rx_trace_t *tr =
		vlib_add_trace (vm, node, b0, sizeof (*tr));
	      tr->next_index = next0;
	      tr->error = error0;
	      tr->tunnel_index = tunnel_index0;
	    }

	  /* Process packet 1 */
	  if (is_ip4)
	    {
	      /* Processing for key4_1 */
	      if (PREDICT_FALSE ((key4_1.as_u64[0] != last_key4.as_u64[0])
				 || (key4_1.as_u64[1] !=
				     last_key4.as_u64[1])))
		{
		  p1 = hash_get_mem (nngm->vxlan4_gpe_tunnel_by_key, &key4_1);

		  if (p1 == 0)
		    {
		      error1 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
		      goto trace1;
		    }

		  last_key4.as_u64[0] = key4_1.as_u64[0];
		  last_key4.as_u64[1] = key4_1.as_u64[1];
		  tunnel_index1 = last_tunnel_index = p1[0];
		}
	      else
		tunnel_index1 = last_tunnel_index;
	    }
	  else			/* is_ip6 */
	    {
	      /* Processing for key6_1 */
	      if (PREDICT_FALSE
		  (memcmp (&key6_1, &last_key6, sizeof (last_key6)) != 0))
		{
		  p1 = hash_get_mem (nngm->vxlan6_gpe_tunnel_by_key, &key6_1);

		  if (p1 == 0)
		    {
		      error1 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
		      goto trace1;
		    }

		  memcpy (&last_key6, &key6_1, sizeof (key6_1));
		  tunnel_index1 = last_tunnel_index = p1[0];
		}
	      else
		tunnel_index1 = last_tunnel_index;
	    }

	  t1 = pool_elt_at_index (nngm->tunnels, tunnel_index1);

	  sw_if_index1 = t1->sw_if_index;
	  len1 = vlib_buffer_length_in_chain (vm, b1);

	  /* Required to make the l2 tag push / pop code work on l2 subifs */
	  vnet_update_l2_len (b1);

	  /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
	  vnet_buffer (b1)->sw_if_index[VLIB_RX] = t1->sw_if_index;

	  /*
	   * ip[46] lookup in the configured FIB
	   */
	  vnet_buffer (b1)->sw_if_index[VLIB_TX] = t1->decap_fib_index;

	  pkts_decapsulated++;
	  stats_n_packets += 1;
	  stats_n_bytes += len1;

	  /* Batch stats increment on the same vxlan tunnel so counter
	     is not incremented per packet */
	  if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index))
	    {
	      stats_n_packets -= 1;
	      stats_n_bytes -= len1;
	      if (stats_n_packets)
		vlib_increment_combined_counter (im->combined_sw_if_counters +
						 VNET_INTERFACE_COUNTER_RX,
						 thread_index,
						 stats_sw_if_index,
						 stats_n_packets,
						 stats_n_bytes);
	      stats_n_packets = 1;
	      stats_n_bytes = len1;
	      stats_sw_if_index = sw_if_index1;
	    }
	  vnet_buffer (b1)->sw_if_index[VLIB_TX] = t1->decap_fib_index;

	trace1:b1->error = error1 ? node->errors[error1] : 0;

	  if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      vxlan_gpe_rx_trace_t *tr =
		vlib_add_trace (vm, node, b1, sizeof (*tr));
	      tr->next_index = next1;
	      tr->error = error1;
	      tr->tunnel_index = tunnel_index1;
	    }

	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
					   n_left_to_next, bi0, bi1, next0,
					   next1);
	}

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0;
	  vlib_buffer_t *b0;
	  u32 next0;
	  ip4_vxlan_gpe_header_t *iuvn4_0;
	  ip6_vxlan_gpe_header_t *iuvn6_0;
	  uword *p0;
	  u32 tunnel_index0;
	  vxlan_gpe_tunnel_t *t0;
	  vxlan4_gpe_tunnel_key_t key4_0;
	  vxlan6_gpe_tunnel_key_t key6_0;
	  u32 error0;
	  u32 sw_if_index0, len0;

	  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_ip4)
	    {
	      /* udp leaves current_data pointing at the vxlan-gpe header */
	      vlib_buffer_advance (b0,
				   -(word) (sizeof (udp_header_t) +
					    sizeof (ip4_header_t)));

	      iuvn4_0 = vlib_buffer_get_current (b0);

	      /* pop (ip, udp, vxlan) */
	      vlib_buffer_advance (b0, sizeof (*iuvn4_0));
	    }
	  else
	    {
	      /* udp leaves current_data pointing at the vxlan-gpe header */
	      vlib_buffer_advance (b0,
				   -(word) (sizeof (udp_header_t) +
					    sizeof (ip6_header_t)));

	      iuvn6_0 = vlib_buffer_get_current (b0);

	      /* pop (ip, udp, vxlan) */
	      vlib_buffer_advance (b0, sizeof (*iuvn6_0));
	    }

	  tunnel_index0 = ~0;
	  error0 = 0;

	  if (is_ip4)
	    {
	      next0 =
		(iuvn4_0->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
		nngm->decap_next_node_list[iuvn4_0->vxlan.protocol] :
		VXLAN_GPE_INPUT_NEXT_DROP;

	      key4_0.local = iuvn4_0->ip4.dst_address.as_u32;
	      key4_0.remote = iuvn4_0->ip4.src_address.as_u32;
	      key4_0.vni = iuvn4_0->vxlan.vni_res;
	      key4_0.pad = 0;

	      /* Processing for key4_0 */
	      if (PREDICT_FALSE ((key4_0.as_u64[0] != last_key4.as_u64[0])
				 || (key4_0.as_u64[1] !=
				     last_key4.as_u64[1])))
		{
		  p0 = hash_get_mem (nngm->vxlan4_gpe_tunnel_by_key, &key4_0);

		  if (p0 == 0)
		    {
		      error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
		      goto trace00;
		    }

		  last_key4.as_u64[0] = key4_0.as_u64[0];
		  last_key4.as_u64[1] = key4_0.as_u64[1];
		  tunnel_index0 = last_tunnel_index = p0[0];
		}
	      else
		tunnel_index0 = last_tunnel_index;
	    }
	  else			/* is_ip6 */
	    {
	      next0 =
		(iuvn6_0->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ?
		nngm->decap_next_node_list[iuvn6_0->vxlan.protocol] :
		VXLAN_GPE_INPUT_NEXT_DROP;

	      key6_0.local.as_u64[0] = iuvn6_0->ip6.dst_address.as_u64[0];
	      key6_0.local.as_u64[1] = iuvn6_0->ip6.dst_address.as_u64[1];
	      key6_0.remote.as_u64[0] = iuvn6_0->ip6.src_address.as_u64[0];
	      key6_0.remote.as_u64[1] = iuvn6_0->ip6.src_address.as_u64[1];
	      key6_0.vni = iuvn6_0->vxlan.vni_res;

	      /* Processing for key6_0 */
	      if (PREDICT_FALSE
		  (memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0))
		{
		  p0 = hash_get_mem (nngm->vxlan6_gpe_tunnel_by_key, &key6_0);

		  if (p0 == 0)
		    {
		      error0 = VXLAN_GPE_ERROR_NO_SUCH_TUNNEL;
		      goto trace00;
		    }

		  memcpy (&last_key6, &key6_0, sizeof (key6_0));
		  tunnel_index0 = last_tunnel_index = p0[0];
		}
	      else
		tunnel_index0 = last_tunnel_index;
	    }

	  t0 = pool_elt_at_index (nngm->tunnels, tunnel_index0);


	  sw_if_index0 = t0->sw_if_index;
	  len0 = vlib_buffer_length_in_chain (vm, b0);

	  /* Required to make the l2 tag push / pop code work on l2 subifs */
	  vnet_update_l2_len (b0);

	  /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
	  vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;

	  /*
	   * ip[46] lookup in the configured FIB
	   */
	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;

	  pkts_decapsulated++;
	  stats_n_packets += 1;
	  stats_n_bytes += len0;

	  /* Batch stats increment on the same vxlan-gpe tunnel so counter
	     is not incremented per packet */
	  if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
	    {
	      stats_n_packets -= 1;
	      stats_n_bytes -= len0;
	      if (stats_n_packets)
		vlib_increment_combined_counter (im->combined_sw_if_counters +
						 VNET_INTERFACE_COUNTER_RX,
						 thread_index,
						 stats_sw_if_index,
						 stats_n_packets,
						 stats_n_bytes);
	      stats_n_packets = 1;
	      stats_n_bytes = len0;
	      stats_sw_if_index = sw_if_index0;
	    }

	trace00:b0->error = error0 ? node->errors[error0] : 0;

	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      vxlan_gpe_rx_trace_t *tr =
		vlib_add_trace (vm, node, b0, sizeof (*tr));
	      tr->next_index = next0;
	      tr->error = error0;
	      tr->tunnel_index = tunnel_index0;
	    }
	  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,
			       is_ip4 ? vxlan4_gpe_input_node.index :
			       vxlan6_gpe_input_node.index,
			       VXLAN_GPE_ERROR_DECAPSULATED,
			       pkts_decapsulated);

  /* Increment any remaining batch stats */
  if (stats_n_packets)
    {
      vlib_increment_combined_counter (im->combined_sw_if_counters +
				       VNET_INTERFACE_COUNTER_RX,
				       thread_index, stats_sw_if_index,
				       stats_n_packets, stats_n_bytes);
      node->runtime_data[0] = stats_sw_if_index;
    }
  return from_frame->n_vectors;
}

/**
 * @brief Graph processing dispatch function for IPv4 VXLAN GPE
 *
 * @node vxlan4-gpe-input
 * @param *vm
 * @param *node
 * @param *from_frame
 *
 * @return from_frame->n_vectors
 *
 */
VLIB_NODE_FN (vxlan4_gpe_input_node) (vlib_main_t * vm,
				      vlib_node_runtime_t * node,
				      vlib_frame_t * from_frame)
{
  return vxlan_gpe_input (vm, node, from_frame, /* is_ip4 */ 1);
}

#ifndef CLIB_MARCH_VARIANT
void
vxlan_gpe_register_decap_protocol (u8 protocol_id, uword next_node_index)
{
  vxlan_gpe_main_t *hm = &vxlan_gpe_main;
  hm->decap_next_node_list[protocol_id] = next_node_index;
  return;
}

void
vxlan_gpe_unregister_decap_protocol (u8 protocol_id, uword next_node_index)
{
  vxlan_gpe_main_t *hm = &vxlan_gpe_main;
  hm->decap_next_node_list[protocol_id] = VXLAN_GPE_INPUT_NEXT_DROP;
  return;
}
#endif /* CLIB_MARCH_VARIANT */

/**
 * @brief Graph processing dispatch function for IPv6 VXLAN GPE
 *
 * @node vxlan6-gpe-input
 * @param *vm
 * @param *node
 * @param *from_frame
 *
 * @return from_frame->n_vectors - uword
 *
 */
VLIB_NODE_FN (vxlan6_gpe_input_node) (vlib_main_t * vm,
				      vlib_node_runtime_t * node,
				      vlib_frame_t * from_frame)
{
  return vxlan_gpe_input (vm, node, from_frame, /* is_ip4 */ 0);
}

/**
 * @brief VXLAN GPE error strings
 */
static char *vxlan_gpe_error_strings[] = {
#define vxlan_gpe_error(n,s) s,
#include <vnet/vxlan-gpe/vxlan_gpe_error.def>
#undef vxlan_gpe_error
#undef _
};

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vxlan4_gpe_input_node) = {
  .name = "vxlan4-gpe-input",
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN(vxlan_gpe_error_strings),
  .error_strings = vxlan_gpe_error_strings,

  .n_next_nodes = VXLAN_GPE_INPUT_N_NEXT,
  .next_nodes = {
#define _(s,n) [VXLAN_GPE_INPUT_NEXT_##s] = n,
    foreach_vxlan_gpe_input_next
#undef _
  },

  .format_buffer = format_vxlan_gpe_with_length,
  .format_trace = format_vxlan_gpe_rx_trace,
  // $$$$ .unformat_buffer = unformat_vxlan_gpe_header,
};
/* *INDENT-ON* */

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vxlan6_gpe_input_node) = {
  .name = "vxlan6-gpe-input",
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN(vxlan_gpe_error_strings),
  .error_strings = vxlan_gpe_error_strings,

  .n_next_nodes = VXLAN_GPE_INPUT_N_NEXT,
  .next_nodes = {
#define _(s,n) [VXLAN_GPE_INPUT_NEXT_##s] = n,
    foreach_vxlan_gpe_input_next
#undef _
  },

  .format_buffer = format_vxlan_gpe_with_length,
  .format_trace = format_vxlan_gpe_rx_trace,
  // $$$$ .unformat_buffer = unformat_vxlan_gpe_header,
};
/* *INDENT-ON* */

typedef enum
{
  IP_VXLAN_BYPASS_NEXT_DROP,
  IP_VXLAN_BYPASS_NEXT_VXLAN,
  IP_VXLAN_BYPASS_N_NEXT,
} ip_vxlan_bypass_next_t;

always_inline uword
ip_vxlan_gpe_bypass_inline (vlib_main_t * vm,
			    vlib_node_runtime_t * node,
			    vlib_frame_t * frame, u32 is_ip4)
{
  vxlan_gpe_main_t *ngm = &vxlan_gpe_main;
  u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
  vlib_node_runtime_t *error_node =
    vlib_node_get_runtime (vm, ip4_input_node.index);
  vtep4_key_t last_vtep4;	/* last IPv4 address / fib index
				   matching a local VTEP address */
  vtep6_key_t last_vtep6;	/* last IPv6 address / fib index
				   matching a local VTEP address */
  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;

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

  vlib_get_buffers (vm, from, bufs, n_left_from);

  if (node->flags & VLIB_NODE_FLAG_TRACE)
    ip4_forward_next_trace (vm, node, frame, VLIB_TX);

  if (is_ip4)
    vtep4_key_init (&last_vtep4);
  else
    vtep6_key_init (&last_vtep6);

  while (n_left_from > 0)
    {
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	  vlib_buffer_t *b0, *b1;
	  ip4_header_t *ip40, *ip41;
	  ip6_header_t *ip60, *ip61;
	  udp_header_t *udp0, *udp1;
	  u32 bi0, ip_len0, udp_len0, flags0, next0;
	  u32 bi1, ip_len1, udp_len1, flags1, next1;
	  i32 len_diff0, len_diff1;
	  u8 error0, good_udp0, proto0;
	  u8 error1, good_udp1, proto1;

	  /* Prefetch next iteration. */
	  {
	    vlib_prefetch_buffer_header (b[2], LOAD);
	    vlib_prefetch_buffer_header (b[3], LOAD);

	    CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
	    CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
	  }

	  bi0 = to_next[0] = from[0];
	  bi1 = to_next[1] = from[1];
	  from += 2;
	  n_left_from -= 2;
	  to_next += 2;
	  n_left_to_next -= 2;

	  b0 = b[0];
	  b1 = b[1];
	  b += 2;
	  if (is_ip4)
	    {
	      ip40 = vlib_buffer_get_current (b0);
	      ip41 = vlib_buffer_get_current (b1);
	    }
	  else
	    {
	      ip60 = vlib_buffer_get_current (b0);
	      ip61 = vlib_buffer_get_current (b1);
	    }

	  /* Setup packet for next IP feature */
	  vnet_feature_next (&next0, b0);
	  vnet_feature_next (&next1, b1);

	  if (is_ip4)
	    {
	      proto0 = ip40->protocol;
	      proto1 = ip41->protocol;
	    }
	  else
	    {
	      proto0 = ip60->protocol;
	      proto1 = ip61->protocol;
	    }

	  /* Process packet 0 */
	  if (proto0 != IP_PROTOCOL_UDP)
	    goto exit0;		/* not UDP packet */

	  if (is_ip4)
	    udp0 = ip4_next_header (ip40);
	  else
	    udp0 = ip6_next_header (ip60);

	  if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_VXLAN_GPE))
	    goto exit0;		/* not VXLAN packet */

	  /* Validate DIP against VTEPs */
	  if (is_ip4)
	    {
#ifdef CLIB_HAVE_VEC512
	      if (!vtep4_check_vector (&ngm->vtep_table, b0, ip40, &last_vtep4,
				       &ngm->vtep4_u512))
#else
	      if (!vtep4_check (&ngm->vtep_table, b0, ip40, &last_vtep4))
#endif
		goto exit0;	/* no local VTEP for VXLAN packet */
	    }
	  else
	    {
	      if (!vtep6_check (&ngm->vtep_table, b0, ip60, &last_vtep6))
		goto exit0;	/* no local VTEP for VXLAN packet */
	    }

	  flags0 = b0->flags;
	  good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;

	  /* Don't verify UDP checksum for packets with explicit zero checksum. */
	  good_udp0 |= udp0->checksum == 0;

	  /* Verify UDP length */
	  if (is_ip4)
	    ip_len0 = clib_net_to_host_u16 (ip40->length);
	  else
	    ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
	  udp_len0 = clib_net_to_host_u16 (udp0->length);
	  len_diff0 = ip_len0 - udp_len0;

	  /* Verify UDP checksum */
	  if (PREDICT_FALSE (!good_udp0))
	    {
	      if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
		{
		  if (is_ip4)
		    flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
		  else
		    flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
		  good_udp0 =
		    (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
		}
	    }

	  if (is_ip4)
	    {
	      error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
	      error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
	    }
	  else
	    {
	      error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
	      error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
	    }

	  next0 = error0 ?
	    IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
	  b0->error = error0 ? error_node->errors[error0] : 0;

	  /* vxlan_gpe-input node expect current at VXLAN header */
	  if (is_ip4)
	    vlib_buffer_advance (b0,
				 sizeof (ip4_header_t) +
				 sizeof (udp_header_t));
	  else
	    vlib_buffer_advance (b0,
				 sizeof (ip6_header_t) +
				 sizeof (udp_header_t));

	exit0:
	  /* Process packet 1 */
	  if (proto1 != IP_PROTOCOL_UDP)
	    goto exit1;		/* not UDP packet */

	  if (is_ip4)
	    udp1 = ip4_next_header (ip41);
	  else
	    udp1 = ip6_next_header (ip61);

	  if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_VXLAN_GPE))
	    goto exit1;		/* not VXLAN packet */

	  /* Validate DIP against VTEPs */
	  if (is_ip4)
	    {
#ifdef CLIB_HAVE_VEC512
	      if (!vtep4_check_vector (&ngm->vtep_table, b1, ip41, &last_vtep4,
				       &ngm->vtep4_u512))
#else
	      if (!vtep4_check (&ngm->vtep_table, b1, ip41, &last_vtep4))
#endif
		goto exit1;	/* no local VTEP for VXLAN packet */
	    }
	  else
	    {
	      if (!vtep6_check (&ngm->vtep_table, b1, ip61, &last_vtep6))
		goto exit1;	/* no local VTEP for VXLAN packet */
	    }

	  flags1 = b1->flags;
	  good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;

	  /* Don't verify UDP checksum for packets with explicit zero checksum. */
	  good_udp1 |= udp1->checksum == 0;

	  /* Verify UDP length */
	  if (is_ip4)
	    ip_len1 = clib_net_to_host_u16 (ip41->length);
	  else
	    ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
	  udp_len1 = clib_net_to_host_u16 (udp1->length);
	  len_diff1 = ip_len1 - udp_len1;

	  /* Verify UDP checksum */
	  if (PREDICT_FALSE (!good_udp1))
	    {
	      if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
		{
		  if (is_ip4)
		    flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
		  else
		    flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
		  good_udp1 =
		    (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
		}
	    }

	  if (is_ip4)
	    {
	      error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
	      error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
	    }
	  else
	    {
	      error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
	      error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
	    }

	  next1 = error1 ?
	    IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
	  b1->error = error1 ? error_node->errors[error1] : 0;

	  /* vxlan_gpe-input node expect current at VXLAN header */
	  if (is_ip4)
	    vlib_buffer_advance (b1,
				 sizeof (ip4_header_t) +
				 sizeof (udp_header_t));
	  else
	    vlib_buffer_advance (b1,
				 sizeof (ip6_header_t) +
				 sizeof (udp_header_t));

	exit1:
	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, bi1, next0, next1);
	}

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  vlib_buffer_t *b0;
	  ip4_header_t *ip40;
	  ip6_header_t *ip60;
	  udp_header_t *udp0;
	  u32 bi0, ip_len0, udp_len0, flags0, next0;
	  i32 len_diff0;
	  u8 error0, good_udp0, proto0;

	  bi0 = to_next[0] = from[0];
	  from += 1;
	  n_left_from -= 1;
	  to_next += 1;
	  n_left_to_next -= 1;

	  b0 = b[0];
	  b++;
	  if (is_ip4)
	    ip40 = vlib_buffer_get_current (b0);
	  else
	    ip60 = vlib_buffer_get_current (b0);

	  /* Setup packet for next IP feature */
	  vnet_feature_next (&next0, b0);

	  if (is_ip4)
	    proto0 = ip40->protocol;
	  else
	    proto0 = ip60->protocol;

	  if (proto0 != IP_PROTOCOL_UDP)
	    goto exit;		/* not UDP packet */

	  if (is_ip4)
	    udp0 = ip4_next_header (ip40);
	  else
	    udp0 = ip6_next_header (ip60);

	  if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_VXLAN_GPE))
	    goto exit;		/* not VXLAN packet */

	  /* Validate DIP against VTEPs */

	  if (is_ip4)
	    {
#ifdef CLIB_HAVE_VEC512
	      if (!vtep4_check_vector (&ngm->vtep_table, b0, ip40, &last_vtep4,
				       &ngm->vtep4_u512))
#else
	      if (!vtep4_check (&ngm->vtep_table, b0, ip40, &last_vtep4))
#endif
		goto exit;	/* no local VTEP for VXLAN packet */
	    }
	  else
	    {
	      if (!vtep6_check (&ngm->vtep_table, b0, ip60, &last_vtep6))
		goto exit;	/* no local VTEP for VXLAN packet */
	    }

	  flags0 = b0->flags;
	  good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;

	  /* Don't verify UDP checksum for packets with explicit zero checksum. */
	  good_udp0 |= udp0->checksum == 0;

	  /* Verify UDP length */
	  if (is_ip4)
	    ip_len0 = clib_net_to_host_u16 (ip40->length);
	  else
	    ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
	  udp_len0 = clib_net_to_host_u16 (udp0->length);
	  len_diff0 = ip_len0 - udp_len0;

	  /* Verify UDP checksum */
	  if (PREDICT_FALSE (!good_udp0))
	    {
	      if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
		{
		  if (is_ip4)
		    flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
		  else
		    flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
		  good_udp0 =
		    (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
		}
	    }

	  if (is_ip4)
	    {
	      error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
	      error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
	    }
	  else
	    {
	      error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
	      error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
	    }

	  next0 = error0 ?
	    IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
	  b0->error = error0 ? error_node->errors[error0] : 0;

	  /* vxlan_gpe-input node expect current at VXLAN header */
	  if (is_ip4)
	    vlib_buffer_advance (b0,
				 sizeof (ip4_header_t) +
				 sizeof (udp_header_t));
	  else
	    vlib_buffer_advance (b0,
				 sizeof (ip6_header_t) +
				 sizeof (udp_header_t));

	exit:
	  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);
    }

  return frame->n_vectors;
}

VLIB_NODE_FN (ip4_vxlan_gpe_bypass_node) (vlib_main_t * vm,
					  vlib_node_runtime_t * node,
					  vlib_frame_t * frame)
{
  return ip_vxlan_gpe_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_vxlan_gpe_bypass_node) = {
  .name = "ip4-vxlan-gpe-bypass",
  .vector_size = sizeof (u32),

  .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
  .next_nodes = {
    [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
    [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan4-gpe-input",
  },

  .format_buffer = format_ip4_header,
  .format_trace = format_ip4_forward_next_trace,
};
/* *INDENT-ON* */

#ifndef CLIB_MARCH_VARIANT
/* Dummy init function to get us linked in. */
clib_error_t *
ip4_vxlan_gpe_bypass_init (vlib_main_t * vm)
{
  return 0;
}

VLIB_INIT_FUNCTION (ip4_vxlan_gpe_bypass_init);
#endif /* CLIB_MARCH_VARIANT */

VLIB_NODE_FN (ip6_vxlan_gpe_bypass_node) (vlib_main_t * vm,
					  vlib_node_runtime_t * node,
					  vlib_frame_t * frame)
{
  return ip_vxlan_gpe_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_vxlan_gpe_bypass_node) = {
  .name = "ip6-vxlan-gpe-bypass",
  .vector_size = sizeof (u32),

  .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
  .next_nodes = {
    [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
    [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan6-gpe-input",
  },

  .format_buffer = format_ip6_header,
  .format_trace = format_ip6_forward_next_trace,
};
/* *INDENT-ON* */

#ifndef CLIB_MARCH_VARIANT
/* Dummy init function to get us linked in. */
clib_error_t *
ip6_vxlan_gpe_bypass_init (vlib_main_t * vm)
{
  return 0;
}

VLIB_INIT_FUNCTION (ip6_vxlan_gpe_bypass_init);
#endif /* CLIB_MARCH_VARIANT */

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