nat: move nat64 to a subfeature

Type: refactor

Change-Id: I3b9e17164647d2019b1f40cffeed63393345219e
Signed-off-by: Filip Varga <fivarga@cisco.com>

10 files changed, 7345 insertions, 0 deletions

diff --git a/src/plugins/nat/nat64/nat64.api b/src/plugins/nat/nat64/nat64.api
new file mode 100644
index 00000000000..5fc4129d041
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64.api
@@ -0,0 +1,316 @@
+/*
+ * Copyright (c) 2020 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 version = "1.0.0";
+import "vnet/ip/ip_types.api";
+import "vnet/interface_types.api";
+import "plugins/nat/nat_types.api";
+
+/**
+ * @file nat64.api
+ * @brief VPP control-plane API messages.
+ *
+ * This file defines VPP control-plane API messages which are generally
+ * called through a shared memory interface.
+ */
+
+/** \brief Enable/disable NAT64 plugin
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param bib_buckets - Number of BIB hash buckets
+    @param bib_memory_size - Memory size of BIB hash
+    @param st_buckets - Number of session table hash buckets
+    @param st_memory_size - Memory size of session table hash
+    @param enable - true if enable, false if disable
+*/
+autoreply define nat64_plugin_enable_disable {
+  u32 client_index;
+  u32 context;
+  u32 bib_buckets;
+  u32 bib_memory_size;
+  u32 st_buckets;
+  u32 st_memory_size;
+  bool enable;
+  option status="in_progress";
+};
+
+/** \brief Set values of timeouts for NAT64 sessions (seconds)
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param udp - UDP timeout (default 300sec)
+    @param tcp_established - TCP established timeout (default 7440sec)
+    @param tcp_transitory - TCP transitory timeout (default 240sec)
+    @param icmp - ICMP timeout (default 60sec)
+*/
+autoreply define nat64_set_timeouts {
+  u32 client_index;
+  u32 context;
+  u32 udp;
+  u32 tcp_established;
+  u32 tcp_transitory;
+  u32 icmp;
+};
+
+/** \brief Get values of timeouts for NAT64 sessions (seconds)
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat64_get_timeouts {
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief Get values of timeouts for NAT64 sessions reply
+    @param context - sender context, to match reply w/ request
+    @param retval - return code
+    @param udp - UDP timeout
+    @param tcp_established - TCP established timeout
+    @param tcp_transitory - TCP transitory timeout
+    @param icmp - ICMP timeout
+*/
+define nat64_get_timeouts_reply {
+  u32 context;
+  i32 retval;
+  u32 udp;
+  u32 tcp_established;
+  u32 tcp_transitory;
+  u32 icmp;
+};
+
+/** \brief Add/delete address range to NAT64 pool
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param start_addr - start IPv4 address of the range
+    @param end_addr - end IPv4 address of the range
+    @param vrf_id - VRF id of tenant, ~0 means independent of VRF
+    @param is_add - true if add, false if delete
+*/
+autoreply define nat64_add_del_pool_addr_range {
+  u32 client_index;
+  u32 context;
+  vl_api_ip4_address_t start_addr;
+  vl_api_ip4_address_t end_addr;
+  u32 vrf_id;
+  bool is_add;
+};
+
+/** \brief Dump NAT64 pool addresses
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat64_pool_addr_dump {
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT64 pool address details response
+    @param context - sender context, to match reply w/ request
+    @param address - IPv4 address
+    @param vfr_id - VRF id of tenant, ~0 means independent of VRF
+*/
+define nat64_pool_addr_details {
+  u32 context;
+  vl_api_ip4_address_t address;
+  u32 vrf_id;
+};
+
+/** \brief Enable/disable NAT64 feature on the interface
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param is_add - true if add, false if delete
+    @param flags - flag NAT_IS_INSIDE if interface is inside else
+                   interface is outside
+    @param sw_if_index - index of the interface
+*/
+autoreply define nat64_add_del_interface {
+  u32 client_index;
+  u32 context;
+  bool is_add;
+  vl_api_nat_config_flags_t flags;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief Dump interfaces with NAT64 feature
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat64_interface_dump {
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT64 interface details response
+    @param context - sender context, to match reply w/ request
+    @param flags - flag NAT_IS_INSIDE if interface is inside,
+                   flag NAT_IS_OUTSIDE if interface is outside
+                   and if both flags are set the interface is
+                   both inside and outside
+    @param sw_if_index - index of the interface
+*/
+define nat64_interface_details {
+  u32 context;
+  vl_api_nat_config_flags_t flags;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief Add/delete NAT64 static BIB entry
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param i_addr - inside IPv6 address
+    @param o_addr - outside IPv4 address
+    @param i_port - inside port number
+    @param o_port - outside port number
+    @param vrf_id - VRF id of tenant
+    @param proto - protocol number
+    @param is_add - true if add, false if delete
+*/
+ autoreply define nat64_add_del_static_bib {
+  u32 client_index;
+  u32 context;
+  vl_api_ip6_address_t i_addr;
+  vl_api_ip4_address_t o_addr;
+  u16 i_port;
+  u16 o_port;
+  u32 vrf_id;
+  u8 proto;
+  bool is_add;
+};
+
+/** \brief Dump NAT64 BIB
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param proto - protocol of the BIB: 255 - all BIBs
+                                        6 - TCP BIB
+                                        17 - UDP BIB
+                                        1/58 - ICMP BIB
+                                        otherwise - "unknown" protocol BIB
+*/
+define nat64_bib_dump {
+  u32 client_index;
+  u32 context;
+  u8 proto;
+};
+
+/** \brief NAT64 BIB details response
+    @param context - sender context, to match reply w/ request
+    @param i_addr - inside IPv6 address
+    @param o_addr - outside IPv4 address
+    @param i_port - inside port number
+    @param o_port - outside port number
+    @param vrf_id - VRF id of tenant
+    @param proto - protocol number
+    @param flags - flag NAT_IS_STATIC if BIB entry is static 
+                   or BIB entry is dynamic
+    @param ses_num - number of sessions associated with the BIB entry
+*/
+define nat64_bib_details {
+  u32 context;
+  vl_api_ip6_address_t i_addr;
+  vl_api_ip4_address_t o_addr;
+  u16 i_port;
+  u16 o_port;
+  u32 vrf_id;
+  u8 proto;
+  vl_api_nat_config_flags_t flags;
+  u32 ses_num;
+};
+
+/** \brief Dump NAT64 session table
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param proto - protocol of the session table: 255 - all STs
+                                                  6 - TCP ST
+                                                  17 - UDP ST
+                                                  1/58 - ICMP ST
+                                                  otherwise - "unknown" proto ST
+*/
+define nat64_st_dump {
+  u32 client_index;
+  u32 context;
+  u8 proto;
+};
+
+/** \brief NAT64 session table details response
+    @param context - sender context, to match reply w/ request
+    @param il_addr - inside IPv6 address of the local host
+    @param ol_addr - outside IPv4 address of the local host
+    @param il_port - inside port number id of the local host/inside ICMP id
+    @param ol_port - outside port number of the local host/outside ICMP id
+    @param ir_addr - inside IPv6 address of the remote host
+    @param or_addr - outside IPv4 address of the remote host
+    @param r_port - port number of the remote host (not used for ICMP)
+    @param vrf_id - VRF id of tenant
+    @param proto - protocol number
+*/
+define nat64_st_details {
+  u32 context;
+  vl_api_ip6_address_t il_addr;
+  vl_api_ip4_address_t ol_addr;
+  u16 il_port;
+  u16 ol_port;
+  vl_api_ip6_address_t ir_addr;
+  vl_api_ip4_address_t or_addr;
+  u16 r_port;
+  u32 vrf_id;
+  u8 proto;
+};
+
+/** \brief Add/del NAT64 prefix
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param prefix - NAT64 prefix
+    @param vrf_id - VRF id of tenant
+    @param is_add - true if add, false if delete
+*/
+autoreply define nat64_add_del_prefix {
+  u32 client_index;
+  u32 context;
+  vl_api_ip6_prefix_t prefix;
+  u32 vrf_id;
+  bool is_add;
+};
+
+/** \brief Dump NAT64 prefix
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat64_prefix_dump {
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief Dump NAT64 prefix details response
+    @param context - sender context, to match reply w/ request
+    @param prefix - NAT64 prefix
+    @param vrf_id - VRF id of tenant
+*/
+define nat64_prefix_details {
+  u32 context;
+  vl_api_ip6_prefix_t prefix;
+  u32 vrf_id;
+};
+
+/** \brief Add/delete NAT64 pool address from specific interfce
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param is_add - true if add, false if delete
+    @param sw_if_index - software index of the interface
+*/
+autoreply define nat64_add_del_interface_addr {
+  u32 client_index;
+  u32 context;
+  bool is_add;
+  vl_api_interface_index_t sw_if_index;
+};
diff --git a/src/plugins/nat/nat64/nat64.c b/src/plugins/nat/nat64/nat64.c
new file mode 100644
index 00000000000..5da498670f6
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64.c
@@ -0,0 +1,1646 @@
+/*
+ * Copyright (c) 2020 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 <vppinfra/crc32.h>
+#include <vnet/fib/ip4_fib.h>
+
+#include <vnet/ip/reass/ip4_sv_reass.h>
+#include <vnet/ip/reass/ip6_sv_reass.h>
+#include <vnet/plugin/plugin.h>
+#include <vpp/app/version.h>
+
+#include <nat/nat64/nat64.h>
+
+nat64_main_t nat64_main;
+
+/* *INDENT-OFF* */
+/* Hook up input features */
+VNET_FEATURE_INIT (nat64_in2out, static) = {
+  .arc_name = "ip6-unicast",
+  .node_name = "nat64-in2out",
+  .runs_before = VNET_FEATURES ("ip6-lookup"),
+  .runs_after = VNET_FEATURES ("ip6-sv-reassembly-feature"),
+};
+VNET_FEATURE_INIT (nat64_out2in, static) = {
+  .arc_name = "ip4-unicast",
+  .node_name = "nat64-out2in",
+  .runs_before = VNET_FEATURES ("ip4-lookup"),
+  .runs_after = VNET_FEATURES ("ip4-sv-reassembly-feature"),
+};
+VNET_FEATURE_INIT (nat64_in2out_handoff, static) = {
+  .arc_name = "ip6-unicast",
+  .node_name = "nat64-in2out-handoff",
+  .runs_before = VNET_FEATURES ("ip6-lookup"),
+  .runs_after = VNET_FEATURES ("ip6-sv-reassembly-feature"),
+};
+VNET_FEATURE_INIT (nat64_out2in_handoff, static) = {
+  .arc_name = "ip4-unicast",
+  .node_name = "nat64-out2in-handoff",
+  .runs_before = VNET_FEATURES ("ip4-lookup"),
+  .runs_after = VNET_FEATURES ("ip4-sv-reassembly-feature"),
+};
+VLIB_PLUGIN_REGISTER () = {
+    .version = VPP_BUILD_VER,
+    .description = "NAT64",
+};
+static u8 well_known_prefix[] = {
+  0x00, 0x64, 0xff, 0x9b,
+  0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00
+};
+/* *INDENT-ON* */
+
+#define nat_elog_str(_str)                      \
+do                                              \
+  {                                             \
+    ELOG_TYPE_DECLARE (e) =                     \
+      {                                         \
+        .format = "nat-msg " _str,              \
+        .format_args = "",                      \
+      };                                        \
+    ELOG_DATA (&vlib_global_main.elog_main, e); \
+  } while (0);
+
+static void
+nat64_ip4_add_del_interface_address_cb (ip4_main_t * im, uword opaque,
+					u32 sw_if_index,
+					ip4_address_t * address,
+					u32 address_length,
+					u32 if_address_index, u32 is_delete)
+{
+  nat64_main_t *nm = &nat64_main;
+  int i, j;
+
+  if (plugin_enabled () == 0)
+    return;
+
+  for (i = 0; i < vec_len (nm->auto_add_sw_if_indices); i++)
+    {
+      if (sw_if_index == nm->auto_add_sw_if_indices[i])
+	{
+	  if (!is_delete)
+	    {
+	      /* Don't trip over lease renewal, static config */
+	      for (j = 0; j < vec_len (nm->addr_pool); j++)
+		if (nm->addr_pool[j].addr.as_u32 == address->as_u32)
+		  return;
+
+	      (void) nat64_add_del_pool_addr (vlib_get_thread_index (),
+					      address, ~0, 1);
+	      return;
+	    }
+	  else
+	    {
+	      (void) nat64_add_del_pool_addr (vlib_get_thread_index (),
+					      address, ~0, 0);
+	      return;
+	    }
+	}
+    }
+}
+
+u32
+nat64_get_worker_in2out (ip6_address_t * addr)
+{
+  nat64_main_t *nm = &nat64_main;
+  u32 next_worker_index = nm->first_worker_index;
+  u32 hash;
+
+#ifdef clib_crc32c_uses_intrinsics
+  hash = clib_crc32c ((u8 *) addr->as_u32, 16);
+#else
+  u64 tmp = addr->as_u64[0] ^ addr->as_u64[1];
+  hash = clib_xxhash (tmp);
+#endif
+
+  if (PREDICT_TRUE (is_pow2 (_vec_len (nm->workers))))
+    next_worker_index += nm->workers[hash & (_vec_len (nm->workers) - 1)];
+  else
+    next_worker_index += nm->workers[hash % _vec_len (nm->workers)];
+
+  return next_worker_index;
+}
+
+u32
+nat64_get_worker_out2in (vlib_buffer_t * b, ip4_header_t * ip)
+{
+  nat64_main_t *nm = &nat64_main;
+  udp_header_t *udp;
+  u16 port;
+  u32 proto;
+
+  proto = ip_proto_to_nat_proto (ip->protocol);
+  udp = ip4_next_header (ip);
+  port = udp->dst_port;
+
+  /* unknown protocol */
+  if (PREDICT_FALSE (proto == NAT_PROTOCOL_OTHER))
+    {
+      nat64_db_t *db;
+      ip46_address_t daddr;
+      nat64_db_bib_entry_t *bibe;
+
+      clib_memset (&daddr, 0, sizeof (daddr));
+      daddr.ip4.as_u32 = ip->dst_address.as_u32;
+
+      /* *INDENT-OFF* */
+      vec_foreach (db, nm->db)
+        {
+          bibe = nat64_db_bib_entry_find (db, &daddr, 0, ip->protocol, 0, 0);
+          if (bibe)
+            return (u32) (db - nm->db);
+        }
+      /* *INDENT-ON* */
+      return vlib_get_thread_index ();
+    }
+
+  /* ICMP */
+  if (PREDICT_FALSE (ip->protocol == IP_PROTOCOL_ICMP))
+    {
+      icmp46_header_t *icmp = (icmp46_header_t *) udp;
+      icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1);
+      if (!icmp_type_is_error_message
+	  (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
+	port = vnet_buffer (b)->ip.reass.l4_src_port;
+      else
+	{
+	  /* if error message, then it's not fragmented and we can access it */
+	  ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1);
+	  proto = ip_proto_to_nat_proto (inner_ip->protocol);
+	  void *l4_header = ip4_next_header (inner_ip);
+	  switch (proto)
+	    {
+	    case NAT_PROTOCOL_ICMP:
+	      icmp = (icmp46_header_t *) l4_header;
+	      echo = (icmp_echo_header_t *) (icmp + 1);
+	      port = echo->identifier;
+	      break;
+	    case NAT_PROTOCOL_UDP:
+	    case NAT_PROTOCOL_TCP:
+	      port = ((tcp_udp_header_t *) l4_header)->src_port;
+	      break;
+	    default:
+	      return vlib_get_thread_index ();
+	    }
+	}
+    }
+
+  /* worker by outside port  (TCP/UDP) */
+  port = clib_net_to_host_u16 (port);
+  if (port > 1024)
+    return nm->first_worker_index + ((port - 1024) / nm->port_per_thread);
+
+  return vlib_get_thread_index ();
+}
+
+clib_error_t *
+nat64_init (vlib_main_t * vm)
+{
+  nat64_main_t *nm = &nat64_main;
+  vlib_thread_main_t *tm = vlib_get_thread_main ();
+  ip4_add_del_interface_address_callback_t cb4;
+  vlib_node_t *node;
+
+  clib_memset (nm, 0, sizeof (*nm));
+
+  nm->ip4_main = &ip4_main;
+  nm->log_class = vlib_log_register_class ("nat64", 0);
+
+  nm->port_per_thread = 0xffff - 1024;
+
+  nm->fq_in2out_index = ~0;
+  nm->fq_out2in_index = ~0;
+
+  node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
+  nm->error_node_index = node->index;
+  node = vlib_get_node_by_name (vm, (u8 *) "nat64-in2out");
+  nm->in2out_node_index = node->index;
+  node = vlib_get_node_by_name (vm, (u8 *) "nat64-in2out-slowpath");
+  nm->in2out_slowpath_node_index = node->index;
+  node = vlib_get_node_by_name (vm, (u8 *) "nat64-out2in");
+  nm->out2in_node_index = node->index;
+
+  node = vlib_get_node_by_name (vm, (u8 *) "nat64-expire-worker-walk");
+  nm->expire_worker_walk_node_index = node->index;
+
+  nm->fib_src_hi = fib_source_allocate ("nat64-hi",
+					FIB_SOURCE_PRIORITY_HI,
+					FIB_SOURCE_BH_SIMPLE);
+  nm->fib_src_low = fib_source_allocate ("nat64-low",
+					 FIB_SOURCE_PRIORITY_LOW,
+					 FIB_SOURCE_BH_SIMPLE);
+
+  // set protocol timeouts to defaults
+  nat64_reset_timeouts ();
+
+  /* Set up the interface address add/del callback */
+  cb4.function = nat64_ip4_add_del_interface_address_cb;
+  cb4.function_opaque = 0;
+  vec_add1 (nm->ip4_main->add_del_interface_address_callbacks, cb4);
+
+  /* Init counters */
+  nm->total_bibs.name = "total-bibs";
+  nm->total_bibs.stat_segment_name = "/nat64/total-bibs";
+  vlib_validate_simple_counter (&nm->total_bibs, 0);
+  vlib_zero_simple_counter (&nm->total_bibs, 0);
+  nm->total_sessions.name = "total-sessions";
+  nm->total_sessions.stat_segment_name = "/nat64/total-sessions";
+  vlib_validate_simple_counter (&nm->total_sessions, 0);
+  vlib_zero_simple_counter (&nm->total_sessions, 0);
+
+  uword *p = hash_get_mem (tm->thread_registrations_by_name, "workers");
+  if (p)
+    {
+      vlib_thread_registration_t *tr;
+      tr = (vlib_thread_registration_t *) p[0];
+      if (tr)
+	{
+	  nm->num_workers = tr->count;
+	  nm->first_worker_index = tr->first_index;
+	}
+    }
+
+  if (nm->num_workers > 1)
+    {
+      int i;
+      uword *bitmap = 0;
+
+      for (i = 0; i < nm->num_workers; i++)
+	bitmap = clib_bitmap_set (bitmap, i, 1);
+
+      /* *INDENT-OFF* */
+      clib_bitmap_foreach (i, bitmap,
+        ({
+          vec_add1(nm->workers, i);
+        }));
+      /* *INDENT-ON* */
+
+      clib_bitmap_free (bitmap);
+
+      nm->port_per_thread = (0xffff - 1024) / _vec_len (nm->workers);
+    }
+
+  // TODO: ipfix needs to be separated from NAT base plugin
+  /* Init IPFIX logging */
+  //snat_ipfix_logging_init (vm);
+
+#define _(x)                                                     \
+  nm->counters.in2out.x.name = #x;                               \
+  nm->counters.in2out.x.stat_segment_name = "/nat64/in2out/" #x; \
+  nm->counters.out2in.x.name = #x;                               \
+  nm->counters.out2in.x.stat_segment_name = "/nat64/out2in/" #x;
+  foreach_nat_counter;
+#undef _
+  return nat64_api_hookup (vm);
+}
+
+VLIB_INIT_FUNCTION (nat64_init);
+
+static void nat64_free_out_addr_and_port (struct nat64_db_s *db,
+					  ip4_address_t * addr, u16 port,
+					  u8 protocol);
+
+int
+nat64_init_hash (nat64_config_t c)
+{
+  vlib_thread_main_t *tm = vlib_get_thread_main ();
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_t *db;
+  int rv = 0;
+
+  vec_validate (nm->db, tm->n_vlib_mains - 1);
+
+  /* *INDENT-OFF* */
+  vec_foreach (db, nm->db)
+    {
+      if (nat64_db_init (db, c, nat64_free_out_addr_and_port))
+        {
+	  nat64_log_err ("NAT64 DB init failed");
+          rv = 1;
+        }
+    }
+  /* *INDENT-ON* */
+
+  return rv;
+}
+
+int
+nat64_free_hash ()
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_t *db;
+  int rv = 0;
+
+  /* *INDENT-OFF* */
+  vec_foreach (db, nm->db)
+    {
+      if (nat64_db_free (db))
+        {
+	  nat64_log_err ("NAT64 DB free failed");
+          rv = 1;
+        }
+    }
+  /* *INDENT-ON* */
+
+  vec_free (nm->db);
+
+  return rv;
+}
+
+int
+nat64_add_del_pool_addr (u32 thread_index,
+			 ip4_address_t * addr, u32 vrf_id, u8 is_add)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_address_t *a = 0;
+  nat64_interface_t *interface;
+  int i;
+  nat64_db_t *db;
+  vlib_thread_main_t *tm = vlib_get_thread_main ();
+
+  /* Check if address already exists */
+  for (i = 0; i < vec_len (nm->addr_pool); i++)
+    {
+      if (nm->addr_pool[i].addr.as_u32 == addr->as_u32)
+	{
+	  a = nm->addr_pool + i;
+	  break;
+	}
+    }
+
+  if (is_add)
+    {
+      if (a)
+	return VNET_API_ERROR_VALUE_EXIST;
+
+      vec_add2 (nm->addr_pool, a, 1);
+      a->addr = *addr;
+      a->fib_index = ~0;
+      if (vrf_id != ~0)
+	a->fib_index =
+	  fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
+					     nm->fib_src_hi);
+#define _(N, id, n, s) \
+      clib_memset (a->busy_##n##_port_refcounts, 0, sizeof(a->busy_##n##_port_refcounts)); \
+      a->busy_##n##_ports = 0; \
+      vec_validate_init_empty (a->busy_##n##_ports_per_thread, tm->n_vlib_mains - 1, 0);
+      foreach_nat_protocol
+#undef _
+    }
+  else
+    {
+      if (!a)
+	return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+      if (a->fib_index != ~0)
+	fib_table_unlock (a->fib_index, FIB_PROTOCOL_IP6, nm->fib_src_hi);
+      /* Delete sessions using address */
+      /* *INDENT-OFF* */
+      vec_foreach (db, nm->db)
+        {
+          nat64_db_free_out_addr (thread_index, db, &a->addr);
+          vlib_set_simple_counter (&nm->total_bibs, db - nm->db, 0,
+                                   db->bib.bib_entries_num);
+          vlib_set_simple_counter (&nm->total_sessions, db - nm->db, 0,
+                                   db->st.st_entries_num);
+        }
+      /* *INDENT-ON* */
+      vec_del1 (nm->addr_pool, i);
+    }
+
+  /* Add/del external address to FIB */
+  /* *INDENT-OFF* */
+  pool_foreach (interface, nm->interfaces,
+  ({
+    if (nat64_interface_is_inside(interface))
+      continue;
+
+    nat64_add_del_addr_to_fib (addr, 32, interface->sw_if_index, is_add);
+    break;
+  }));
+  /* *INDENT-ON* */
+
+  return 0;
+}
+
+void
+nat64_pool_addr_walk (nat64_pool_addr_walk_fn_t fn, void *ctx)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_address_t *a = 0;
+
+  /* *INDENT-OFF* */
+  vec_foreach (a, nm->addr_pool)
+    {
+      if (fn (a, ctx))
+        break;
+    };
+  /* *INDENT-ON* */
+}
+
+int
+nat64_add_interface_address (u32 sw_if_index, int is_add)
+{
+  nat64_main_t *nm = &nat64_main;
+  ip4_main_t *ip4_main = nm->ip4_main;
+  ip4_address_t *first_int_addr;
+  int i;
+
+  first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index, 0);
+
+  for (i = 0; i < vec_len (nm->auto_add_sw_if_indices); i++)
+    {
+      if (nm->auto_add_sw_if_indices[i] == sw_if_index)
+	{
+	  if (is_add)
+	    return VNET_API_ERROR_VALUE_EXIST;
+	  else
+	    {
+	      /* if have address remove it */
+	      if (first_int_addr)
+		(void) nat64_add_del_pool_addr (vlib_get_thread_index (),
+						first_int_addr, ~0, 0);
+	      vec_del1 (nm->auto_add_sw_if_indices, i);
+	      return 0;
+	    }
+	}
+    }
+
+  if (!is_add)
+    return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+  /* add to the auto-address list */
+  vec_add1 (nm->auto_add_sw_if_indices, sw_if_index);
+
+  /* If the address is already bound - or static - add it now */
+  if (first_int_addr)
+    (void) nat64_add_del_pool_addr (vlib_get_thread_index (),
+				    first_int_addr, ~0, 1);
+
+  return 0;
+}
+
+static void
+nat64_validate_counters (nat64_main_t * nm, u32 sw_if_index)
+{
+#define _(x)                                                          \
+  vlib_validate_simple_counter (&nm->counters.in2out.x, sw_if_index); \
+  vlib_zero_simple_counter (&nm->counters.in2out.x, sw_if_index);     \
+  vlib_validate_simple_counter (&nm->counters.out2in.x, sw_if_index); \
+  vlib_zero_simple_counter (&nm->counters.out2in.x, sw_if_index);
+  foreach_nat_counter;
+#undef _
+}
+
+void
+nat64_add_del_addr_to_fib (ip4_address_t * addr, u8 p_len, u32 sw_if_index,
+			   int is_add)
+{
+  nat64_main_t *nm = &nat64_main;
+  fib_prefix_t prefix = {
+    .fp_len = p_len,
+    .fp_proto = FIB_PROTOCOL_IP4,
+    .fp_addr = {
+		.ip4.as_u32 = addr->as_u32,
+		},
+  };
+  u32 fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
+
+  if (is_add)
+    fib_table_entry_update_one_path (fib_index,
+				     &prefix,
+				     nm->fib_src_low,
+				     (FIB_ENTRY_FLAG_CONNECTED |
+				      FIB_ENTRY_FLAG_LOCAL |
+				      FIB_ENTRY_FLAG_EXCLUSIVE),
+				     DPO_PROTO_IP4,
+				     NULL,
+				     sw_if_index,
+				     ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
+  else
+    fib_table_entry_delete (fib_index, &prefix, nm->fib_src_low);
+}
+
+int
+nat64_interface_add_del (u32 sw_if_index, u8 is_inside, u8 is_add)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  nat64_main_t *nm = &nat64_main;
+  nat64_interface_t *interface = 0, *i;
+  nat64_address_t *ap;
+  const char *feature_name, *arc_name;
+
+  // TODO: is enabled ? we can't signal if it is not
+
+  /* Check if interface already exists */
+  /* *INDENT-OFF* */
+  pool_foreach (i, nm->interfaces,
+  ({
+    if (i->sw_if_index == sw_if_index)
+      {
+        interface = i;
+        break;
+      }
+  }));
+  /* *INDENT-ON* */
+
+  if (is_add)
+    {
+      if (interface)
+	goto set_flags;
+
+      pool_get (nm->interfaces, interface);
+      interface->sw_if_index = sw_if_index;
+      interface->flags = 0;
+      nat64_validate_counters (nm, sw_if_index);
+    set_flags:
+      if (is_inside)
+	interface->flags |= NAT64_INTERFACE_FLAG_IS_INSIDE;
+      else
+	interface->flags |= NAT64_INTERFACE_FLAG_IS_OUTSIDE;
+
+      nm->total_enabled_count++;
+      vlib_process_signal_event (vm,
+				 nm->expire_walk_node_index,
+				 NAT64_CLEANER_RESCHEDULE, 0);
+
+    }
+  else
+    {
+      if (!interface)
+	return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+      if ((nat64_interface_is_inside (interface)
+	   && nat64_interface_is_outside (interface)))
+	interface->flags &=
+	  is_inside ? ~NAT64_INTERFACE_FLAG_IS_INSIDE :
+	  ~NAT64_INTERFACE_FLAG_IS_OUTSIDE;
+      else
+	pool_put (nm->interfaces, interface);
+
+      nm->total_enabled_count--;
+    }
+
+  if (!is_inside)
+    {
+      /* *INDENT-OFF* */
+      vec_foreach (ap, nm->addr_pool)
+        nat64_add_del_addr_to_fib (&ap->addr, 32, sw_if_index, is_add);
+      /* *INDENT-ON* */
+    }
+
+  if (nm->num_workers > 1)
+    {
+      feature_name =
+	is_inside ? "nat64-in2out-handoff" : "nat64-out2in-handoff";
+      if (nm->fq_in2out_index == ~0)
+	nm->fq_in2out_index =
+	  vlib_frame_queue_main_init (nat64_in2out_node.index, 0);
+      if (nm->fq_out2in_index == ~0)
+	nm->fq_out2in_index =
+	  vlib_frame_queue_main_init (nat64_out2in_node.index, 0);
+    }
+  else
+    feature_name = is_inside ? "nat64-in2out" : "nat64-out2in";
+
+  arc_name = is_inside ? "ip6-unicast" : "ip4-unicast";
+
+  if (is_inside)
+    {
+      int rv = ip6_sv_reass_enable_disable_with_refcnt (sw_if_index, is_add);
+      if (rv)
+	return rv;
+    }
+  else
+    {
+      int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, is_add);
+      if (rv)
+	return rv;
+    }
+
+  return vnet_feature_enable_disable (arc_name, feature_name, sw_if_index,
+				      is_add, 0, 0);
+}
+
+void
+nat64_interfaces_walk (nat64_interface_walk_fn_t fn, void *ctx)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_interface_t *i = 0;
+
+  /* *INDENT-OFF* */
+  pool_foreach (i, nm->interfaces,
+  ({
+    if (fn (i, ctx))
+      break;
+  }));
+  /* *INDENT-ON* */
+}
+
+// TODO: plugin independent
+static_always_inline u16
+nat64_random_port (u16 min, u16 max)
+{
+  nat64_main_t *nm = &nat64_main;
+  u32 rwide;
+  u16 r;
+
+  rwide = random_u32 (&nm->random_seed);
+  r = rwide & 0xFFFF;
+  if (r >= min && r <= max)
+    return r;
+
+  return min + (rwide % (max - min + 1));
+}
+
+static_always_inline int
+nat64_alloc_addr_and_port_default (nat64_address_t * addresses,
+				   u32 fib_index,
+				   u32 thread_index,
+				   nat_protocol_t proto,
+				   ip4_address_t * addr,
+				   u16 * port,
+				   u16 port_per_thread, u32 nat_thread_index)
+{
+  int i;
+  nat64_address_t *a, *ga = 0;
+  u32 portnum;
+
+  for (i = 0; i < vec_len (addresses); i++)
+    {
+      a = addresses + i;
+      switch (proto)
+	{
+#define _(N, j, n, s) \
+        case NAT_PROTOCOL_##N: \
+          if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread) \
+            { \
+              if (a->fib_index == fib_index) \
+                { \
+                  while (1) \
+                    { \
+                      portnum = (port_per_thread * \
+                        nat_thread_index) + \
+                        nat64_random_port(0, port_per_thread - 1) + 1024; \
+                      if (a->busy_##n##_port_refcounts[portnum]) \
+                        continue; \
+		      --a->busy_##n##_port_refcounts[portnum]; \
+                      a->busy_##n##_ports_per_thread[thread_index]++; \
+                      a->busy_##n##_ports++; \
+                      *addr = a->addr; \
+                      *port = clib_host_to_net_u16(portnum); \
+                      return 0; \
+                    } \
+                } \
+              else if (a->fib_index == ~0) \
+                { \
+                  ga = a; \
+                } \
+            } \
+          break;
+	  foreach_nat_protocol
+#undef _
+	default:
+	  return 1;
+	}
+
+    }
+
+  if (ga)
+    {
+      a = ga;
+      switch (proto)
+	{
+#define _(N, j, n, s) \
+        case NAT_PROTOCOL_##N: \
+          while (1) \
+            { \
+              portnum = (port_per_thread * \
+                nat_thread_index) + \
+                nat64_random_port(0, port_per_thread - 1) + 1024; \
+	      if (a->busy_##n##_port_refcounts[portnum]) \
+                continue; \
+	      ++a->busy_##n##_port_refcounts[portnum]; \
+              a->busy_##n##_ports_per_thread[thread_index]++; \
+              a->busy_##n##_ports++; \
+              *addr = a->addr; \
+              *port = clib_host_to_net_u16(portnum); \
+              return 0; \
+            }
+	  break;
+	  foreach_nat_protocol
+#undef _
+	default:
+	  return 1;
+	}
+    }
+
+  /* Totally out of translations to use... */
+  //snat_ipfix_logging_addresses_exhausted (thread_index, 0);
+  return 1;
+}
+
+int
+nat64_alloc_out_addr_and_port (u32 fib_index, nat_protocol_t proto,
+			       ip4_address_t * addr, u16 * port,
+			       u32 thread_index)
+{
+  nat64_main_t *nm = &nat64_main;
+  u32 worker_index = 0;
+  int rv;
+
+  if (nm->num_workers > 1)
+    worker_index = thread_index - nm->first_worker_index;
+
+  rv = nat64_alloc_addr_and_port_default (nm->addr_pool, fib_index,
+					  thread_index,
+					  proto, addr, port,
+					  nm->port_per_thread, worker_index);
+
+  return rv;
+}
+
+static void
+nat64_free_out_addr_and_port (struct nat64_db_s *db, ip4_address_t * addr,
+			      u16 port, u8 protocol)
+{
+  nat64_main_t *nm = &nat64_main;
+  u32 thread_index = db - nm->db;
+  nat_protocol_t proto = ip_proto_to_nat_proto (protocol);
+  u16 port_host_byte_order = clib_net_to_host_u16 (port);
+  nat64_address_t *a;
+  int i;
+
+  for (i = 0; i < vec_len (nm->addr_pool); i++)
+    {
+      a = nm->addr_pool + i;
+      if (addr->as_u32 != a->addr.as_u32)
+	continue;
+      switch (proto)
+	{
+#define _(N, j, n, s) \
+        case NAT_PROTOCOL_##N: \
+          ASSERT (a->busy_##n##_port_refcounts[port_host_byte_order] >= 1); \
+          --a->busy_##n##_port_refcounts[port_host_byte_order]; \
+          a->busy_##n##_ports--; \
+          a->busy_##n##_ports_per_thread[thread_index]--; \
+          break;
+	  foreach_nat_protocol
+#undef _
+	default:
+	  nat_elog_str ("unknown protocol");
+	  return;
+	}
+      break;
+    }
+}
+
+/**
+ * @brief Add/delete static BIB entry in worker thread.
+ */
+static uword
+nat64_static_bib_worker_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
+			    vlib_frame_t * f)
+{
+  nat64_main_t *nm = &nat64_main;
+  u32 thread_index = vm->thread_index;
+  nat64_db_t *db = &nm->db[thread_index];
+  nat64_static_bib_to_update_t *static_bib;
+  nat64_db_bib_entry_t *bibe;
+  ip46_address_t addr;
+
+  /* *INDENT-OFF* */
+  pool_foreach (static_bib, nm->static_bibs,
+  ({
+    if ((static_bib->thread_index != thread_index) || (static_bib->done))
+      continue;
+
+    if (static_bib->is_add)
+      {
+          (void) nat64_db_bib_entry_create (thread_index, db,
+                                            &static_bib->in_addr,
+                                            &static_bib->out_addr,
+                                            static_bib->in_port,
+                                            static_bib->out_port,
+                                            static_bib->fib_index,
+                                            static_bib->proto, 1);
+          vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
+                                   db->bib.bib_entries_num);
+      }
+    else
+      {
+        addr.as_u64[0] = static_bib->in_addr.as_u64[0];
+        addr.as_u64[1] = static_bib->in_addr.as_u64[1];
+        bibe = nat64_db_bib_entry_find (db, &addr, static_bib->in_port,
+                                        static_bib->proto,
+                                        static_bib->fib_index, 1);
+        if (bibe)
+          {
+            nat64_db_bib_entry_free (thread_index, db, bibe);
+            vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
+                                     db->bib.bib_entries_num);
+            vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
+                                     db->st.st_entries_num);
+          }
+      }
+
+      static_bib->done = 1;
+  }));
+  /* *INDENT-ON* */
+
+  return 0;
+}
+
+static vlib_node_registration_t nat64_static_bib_worker_node;
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_static_bib_worker_node, static) = {
+    .function = nat64_static_bib_worker_fn,
+    .type = VLIB_NODE_TYPE_INPUT,
+    .state = VLIB_NODE_STATE_INTERRUPT,
+    .name = "nat64-static-bib-worker",
+};
+/* *INDENT-ON* */
+
+int
+nat64_add_del_static_bib_entry (ip6_address_t * in_addr,
+				ip4_address_t * out_addr, u16 in_port,
+				u16 out_port, u8 proto, u32 vrf_id, u8 is_add)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_bib_entry_t *bibe;
+  u32 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
+						     nm->fib_src_hi);
+  nat_protocol_t p = ip_proto_to_nat_proto (proto);
+  ip46_address_t addr;
+  int i;
+  nat64_address_t *a;
+  u32 thread_index = 0;
+  nat64_db_t *db;
+  nat64_static_bib_to_update_t *static_bib;
+  vlib_main_t *worker_vm;
+  u32 *to_be_free = 0, *index;
+
+  if (nm->num_workers > 1)
+    {
+      thread_index = nat64_get_worker_in2out (in_addr);
+      db = &nm->db[thread_index];
+    }
+  else
+    db = &nm->db[nm->num_workers];
+
+  addr.as_u64[0] = in_addr->as_u64[0];
+  addr.as_u64[1] = in_addr->as_u64[1];
+  bibe =
+    nat64_db_bib_entry_find (db, &addr, clib_host_to_net_u16 (in_port),
+			     proto, fib_index, 1);
+
+  if (is_add)
+    {
+      if (bibe)
+	return VNET_API_ERROR_VALUE_EXIST;
+
+      /* outside port must be assigned to same thread as internall address */
+      if ((out_port > 1024) && (nm->num_workers > 1))
+	{
+	  if (thread_index != ((out_port - 1024) / nm->port_per_thread))
+	    return VNET_API_ERROR_INVALID_VALUE_2;
+	}
+
+      for (i = 0; i < vec_len (nm->addr_pool); i++)
+	{
+	  a = nm->addr_pool + i;
+	  if (out_addr->as_u32 != a->addr.as_u32)
+	    continue;
+	  switch (p)
+	    {
+#define _(N, j, n, s) \
+            case NAT_PROTOCOL_##N: \
+              if (a->busy_##n##_port_refcounts[out_port]) \
+                return VNET_API_ERROR_INVALID_VALUE; \
+	      ++a->busy_##n##_port_refcounts[out_port]; \
+              if (out_port > 1024) \
+                { \
+                  a->busy_##n##_ports++; \
+                  a->busy_##n##_ports_per_thread[thread_index]++; \
+                } \
+              break;
+	      foreach_nat_protocol
+#undef _
+	    default:
+	      clib_memset (&addr, 0, sizeof (addr));
+	      addr.ip4.as_u32 = out_addr->as_u32;
+	      if (nat64_db_bib_entry_find (db, &addr, 0, proto, fib_index, 0))
+		return VNET_API_ERROR_INVALID_VALUE;
+	    }
+	  break;
+	}
+      if (!nm->num_workers)
+	{
+	  bibe =
+	    nat64_db_bib_entry_create (thread_index, db, in_addr, out_addr,
+				       clib_host_to_net_u16 (in_port),
+				       clib_host_to_net_u16 (out_port),
+				       fib_index, proto, 1);
+	  if (!bibe)
+	    return VNET_API_ERROR_UNSPECIFIED;
+
+	  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
+				   db->bib.bib_entries_num);
+	}
+    }
+  else
+    {
+      if (!bibe)
+	return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+      if (!nm->num_workers)
+	{
+	  nat64_db_bib_entry_free (thread_index, db, bibe);
+	  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
+				   db->bib.bib_entries_num);
+	}
+    }
+
+  if (nm->num_workers)
+    {
+      /* *INDENT-OFF* */
+      pool_foreach (static_bib, nm->static_bibs,
+      ({
+        if (static_bib->done)
+          vec_add1 (to_be_free, static_bib - nm->static_bibs);
+      }));
+      vec_foreach (index, to_be_free)
+        pool_put_index (nm->static_bibs, index[0]);
+      /* *INDENT-ON* */
+      vec_free (to_be_free);
+      pool_get (nm->static_bibs, static_bib);
+      static_bib->in_addr.as_u64[0] = in_addr->as_u64[0];
+      static_bib->in_addr.as_u64[1] = in_addr->as_u64[1];
+      static_bib->in_port = clib_host_to_net_u16 (in_port);
+      static_bib->out_addr.as_u32 = out_addr->as_u32;
+      static_bib->out_port = clib_host_to_net_u16 (out_port);
+      static_bib->fib_index = fib_index;
+      static_bib->proto = proto;
+      static_bib->is_add = is_add;
+      static_bib->thread_index = thread_index;
+      static_bib->done = 0;
+      worker_vm = vlib_mains[thread_index];
+      if (worker_vm)
+	vlib_node_set_interrupt_pending (worker_vm,
+					 nat64_static_bib_worker_node.index);
+      else
+	return VNET_API_ERROR_UNSPECIFIED;
+    }
+
+  return 0;
+}
+
+int
+nat64_set_udp_timeout (u32 timeout)
+{
+  nat64_main_t *nm = &nat64_main;
+
+  if (timeout == 0)
+    nm->udp_timeout = NAT_UDP_TIMEOUT;
+  else
+    nm->udp_timeout = timeout;
+
+  return 0;
+}
+
+u32
+nat64_get_udp_timeout (void)
+{
+  nat64_main_t *nm = &nat64_main;
+
+  return nm->udp_timeout;
+}
+
+int
+nat64_set_icmp_timeout (u32 timeout)
+{
+  nat64_main_t *nm = &nat64_main;
+
+  if (timeout == 0)
+    nm->icmp_timeout = NAT_ICMP_TIMEOUT;
+  else
+    nm->icmp_timeout = timeout;
+
+  return 0;
+}
+
+void
+nat64_reset_timeouts ()
+{
+  nat64_main_t *nm = &nat64_main;
+
+  nm->udp_timeout = NAT_UDP_TIMEOUT;
+  nm->icmp_timeout = NAT_ICMP_TIMEOUT;
+  nm->tcp_est_timeout = NAT_TCP_ESTABLISHED_TIMEOUT;
+  nm->tcp_trans_timeout = NAT_TCP_TRANSITORY_TIMEOUT;
+}
+
+u32
+nat64_get_icmp_timeout (void)
+{
+  nat64_main_t *nm = &nat64_main;
+
+  return nm->icmp_timeout;
+}
+
+int
+nat64_set_tcp_timeouts (u32 trans, u32 est)
+{
+  nat64_main_t *nm = &nat64_main;
+
+  if (trans == 0)
+    nm->tcp_trans_timeout = NAT_TCP_TRANSITORY_TIMEOUT;
+  else
+    nm->tcp_trans_timeout = trans;
+
+  if (est == 0)
+    nm->tcp_est_timeout = NAT_TCP_ESTABLISHED_TIMEOUT;
+  else
+    nm->tcp_est_timeout = est;
+
+  return 0;
+}
+
+u32
+nat64_get_tcp_trans_timeout (void)
+{
+  nat64_main_t *nm = &nat64_main;
+
+  return nm->tcp_trans_timeout;
+}
+
+u32
+nat64_get_tcp_est_timeout (void)
+{
+  nat64_main_t *nm = &nat64_main;
+
+  return nm->tcp_est_timeout;
+}
+
+void
+nat64_session_reset_timeout (nat64_db_st_entry_t * ste, vlib_main_t * vm)
+{
+  nat64_main_t *nm = &nat64_main;
+  u32 now = (u32) vlib_time_now (vm);
+
+  switch (ip_proto_to_nat_proto (ste->proto))
+    {
+    case NAT_PROTOCOL_ICMP:
+      ste->expire = now + nm->icmp_timeout;
+      return;
+    case NAT_PROTOCOL_TCP:
+      {
+	switch (ste->tcp_state)
+	  {
+	  case NAT64_TCP_STATE_V4_INIT:
+	  case NAT64_TCP_STATE_V6_INIT:
+	  case NAT64_TCP_STATE_V4_FIN_RCV:
+	  case NAT64_TCP_STATE_V6_FIN_RCV:
+	  case NAT64_TCP_STATE_V6_FIN_V4_FIN_RCV:
+	  case NAT64_TCP_STATE_TRANS:
+	    ste->expire = now + nm->tcp_trans_timeout;
+	    return;
+	  case NAT64_TCP_STATE_ESTABLISHED:
+	    ste->expire = now + nm->tcp_est_timeout;
+	    return;
+	  default:
+	    return;
+	  }
+      }
+    case NAT_PROTOCOL_UDP:
+      ste->expire = now + nm->udp_timeout;
+      return;
+    default:
+      ste->expire = now + nm->udp_timeout;
+      return;
+    }
+}
+
+void
+nat64_tcp_session_set_state (nat64_db_st_entry_t * ste, tcp_header_t * tcp,
+			     u8 is_ip6)
+{
+  switch (ste->tcp_state)
+    {
+    case NAT64_TCP_STATE_CLOSED:
+      {
+	if (tcp->flags & TCP_FLAG_SYN)
+	  {
+	    if (is_ip6)
+	      ste->tcp_state = NAT64_TCP_STATE_V6_INIT;
+	    else
+	      ste->tcp_state = NAT64_TCP_STATE_V4_INIT;
+	  }
+	return;
+      }
+    case NAT64_TCP_STATE_V4_INIT:
+      {
+	if (is_ip6 && (tcp->flags & TCP_FLAG_SYN))
+	  ste->tcp_state = NAT64_TCP_STATE_ESTABLISHED;
+	return;
+      }
+    case NAT64_TCP_STATE_V6_INIT:
+      {
+	if (!is_ip6 && (tcp->flags & TCP_FLAG_SYN))
+	  ste->tcp_state = NAT64_TCP_STATE_ESTABLISHED;
+	return;
+      }
+    case NAT64_TCP_STATE_ESTABLISHED:
+      {
+	if (tcp->flags & TCP_FLAG_FIN)
+	  {
+	    if (is_ip6)
+	      ste->tcp_state = NAT64_TCP_STATE_V6_FIN_RCV;
+	    else
+	      ste->tcp_state = NAT64_TCP_STATE_V4_FIN_RCV;
+	  }
+	else if (tcp->flags & TCP_FLAG_RST)
+	  {
+	    ste->tcp_state = NAT64_TCP_STATE_TRANS;
+	  }
+	return;
+      }
+    case NAT64_TCP_STATE_V4_FIN_RCV:
+      {
+	if (is_ip6 && (tcp->flags & TCP_FLAG_FIN))
+	  ste->tcp_state = NAT64_TCP_STATE_V6_FIN_V4_FIN_RCV;
+	return;
+      }
+    case NAT64_TCP_STATE_V6_FIN_RCV:
+      {
+	if (!is_ip6 && (tcp->flags & TCP_FLAG_FIN))
+	  ste->tcp_state = NAT64_TCP_STATE_V6_FIN_V4_FIN_RCV;
+	return;
+      }
+    case NAT64_TCP_STATE_TRANS:
+      {
+	if (!(tcp->flags & TCP_FLAG_RST))
+	  ste->tcp_state = NAT64_TCP_STATE_ESTABLISHED;
+	return;
+      }
+    default:
+      return;
+    }
+}
+
+int
+nat64_add_del_prefix (ip6_address_t * prefix, u8 plen, u32 vrf_id, u8 is_add)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_prefix_t *p = 0;
+  int i;
+
+  /* Verify prefix length */
+  if (plen != 32 && plen != 40 && plen != 48 && plen != 56 && plen != 64
+      && plen != 96)
+    return VNET_API_ERROR_INVALID_VALUE;
+
+  /* Check if tenant already have prefix */
+  for (i = 0; i < vec_len (nm->pref64); i++)
+    {
+      if (nm->pref64[i].vrf_id == vrf_id)
+	{
+	  p = nm->pref64 + i;
+	  break;
+	}
+    }
+
+  if (is_add)
+    {
+      if (!p)
+	{
+	  vec_add2 (nm->pref64, p, 1);
+	  p->fib_index =
+	    fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
+					       nm->fib_src_hi);
+	  p->vrf_id = vrf_id;
+	}
+
+      p->prefix.as_u64[0] = prefix->as_u64[0];
+      p->prefix.as_u64[1] = prefix->as_u64[1];
+      p->plen = plen;
+    }
+  else
+    {
+      if (!p)
+	return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+      // TODO: missing fib_table_unlock ?
+
+      vec_del1 (nm->pref64, i);
+    }
+
+  return 0;
+}
+
+void
+nat64_prefix_walk (nat64_prefix_walk_fn_t fn, void *ctx)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_prefix_t *p = 0;
+
+  /* *INDENT-OFF* */
+  vec_foreach (p, nm->pref64)
+    {
+      if (fn (p, ctx))
+        break;
+    };
+  /* *INDENT-ON* */
+}
+
+void
+nat64_compose_ip6 (ip6_address_t * ip6, ip4_address_t * ip4, u32 fib_index)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_prefix_t *p, *gp = 0, *prefix = 0;
+
+  /* *INDENT-OFF* */
+  vec_foreach (p, nm->pref64)
+    {
+      if (p->fib_index == fib_index)
+        {
+          prefix = p;
+          break;
+        }
+
+      if (p->fib_index == 0)
+        gp = p;
+    };
+  /* *INDENT-ON* */
+
+  if (!prefix)
+    prefix = gp;
+
+  if (prefix)
+    {
+      clib_memcpy_fast (ip6, &p->prefix, sizeof (ip6_address_t));
+      switch (p->plen)
+	{
+	case 32:
+	  ip6->as_u32[1] = ip4->as_u32;
+	  break;
+	case 40:
+	  ip6->as_u8[5] = ip4->as_u8[0];
+	  ip6->as_u8[6] = ip4->as_u8[1];
+	  ip6->as_u8[7] = ip4->as_u8[2];
+	  ip6->as_u8[9] = ip4->as_u8[3];
+	  break;
+	case 48:
+	  ip6->as_u8[6] = ip4->as_u8[0];
+	  ip6->as_u8[7] = ip4->as_u8[1];
+	  ip6->as_u8[9] = ip4->as_u8[2];
+	  ip6->as_u8[10] = ip4->as_u8[3];
+	  break;
+	case 56:
+	  ip6->as_u8[7] = ip4->as_u8[0];
+	  ip6->as_u8[9] = ip4->as_u8[1];
+	  ip6->as_u8[10] = ip4->as_u8[2];
+	  ip6->as_u8[11] = ip4->as_u8[3];
+	  break;
+	case 64:
+	  ip6->as_u8[9] = ip4->as_u8[0];
+	  ip6->as_u8[10] = ip4->as_u8[1];
+	  ip6->as_u8[11] = ip4->as_u8[2];
+	  ip6->as_u8[12] = ip4->as_u8[3];
+	  break;
+	case 96:
+	  ip6->as_u32[3] = ip4->as_u32;
+	  break;
+	default:
+	  nat_elog_str ("invalid prefix length");
+	  break;
+	}
+    }
+  else
+    {
+      clib_memcpy_fast (ip6, well_known_prefix, sizeof (ip6_address_t));
+      ip6->as_u32[3] = ip4->as_u32;
+    }
+}
+
+void
+nat64_extract_ip4 (ip6_address_t * ip6, ip4_address_t * ip4, u32 fib_index)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_prefix_t *p, *gp = 0;
+  u8 plen = 0;
+
+  /* *INDENT-OFF* */
+  vec_foreach (p, nm->pref64)
+    {
+      if (p->fib_index == fib_index)
+        {
+          plen = p->plen;
+          break;
+        }
+
+      if (p->vrf_id == 0)
+        gp = p;
+    };
+  /* *INDENT-ON* */
+
+  if (!plen)
+    {
+      if (gp)
+	plen = gp->plen;
+      else
+	plen = 96;
+    }
+
+  switch (plen)
+    {
+    case 32:
+      ip4->as_u32 = ip6->as_u32[1];
+      break;
+    case 40:
+      ip4->as_u8[0] = ip6->as_u8[5];
+      ip4->as_u8[1] = ip6->as_u8[6];
+      ip4->as_u8[2] = ip6->as_u8[7];
+      ip4->as_u8[3] = ip6->as_u8[9];
+      break;
+    case 48:
+      ip4->as_u8[0] = ip6->as_u8[6];
+      ip4->as_u8[1] = ip6->as_u8[7];
+      ip4->as_u8[2] = ip6->as_u8[9];
+      ip4->as_u8[3] = ip6->as_u8[10];
+      break;
+    case 56:
+      ip4->as_u8[0] = ip6->as_u8[7];
+      ip4->as_u8[1] = ip6->as_u8[9];
+      ip4->as_u8[2] = ip6->as_u8[10];
+      ip4->as_u8[3] = ip6->as_u8[11];
+      break;
+    case 64:
+      ip4->as_u8[0] = ip6->as_u8[9];
+      ip4->as_u8[1] = ip6->as_u8[10];
+      ip4->as_u8[2] = ip6->as_u8[11];
+      ip4->as_u8[3] = ip6->as_u8[12];
+      break;
+    case 96:
+      ip4->as_u32 = ip6->as_u32[3];
+      break;
+    default:
+      nat_elog_str ("invalid prefix length");
+      break;
+    }
+}
+
+/**
+ * @brief Per worker process checking expire time for NAT64 sessions.
+ */
+static uword
+nat64_expire_worker_walk_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
+			     vlib_frame_t * f)
+{
+  nat64_main_t *nm = &nat64_main;
+  u32 thread_index = vm->thread_index;
+  nat64_db_t *db;
+  u32 now;
+
+  // TODO: barier sync on plugin enabled
+  if (plugin_enabled () == 0)
+    return 0;
+
+  db = &nm->db[thread_index];
+  now = (u32) vlib_time_now (vm);
+
+  nad64_db_st_free_expired (thread_index, db, now);
+  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
+			   db->bib.bib_entries_num);
+  vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
+			   db->st.st_entries_num);
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_expire_worker_walk_node, static) = {
+    .function = nat64_expire_worker_walk_fn,
+    .type = VLIB_NODE_TYPE_INPUT,
+    .state = VLIB_NODE_STATE_INTERRUPT,
+    .name = "nat64-expire-worker-walk",
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief Centralized process to drive per worker expire walk.
+ */
+static uword
+nat64_expire_walk_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
+		      vlib_frame_t * f)
+{
+  nat64_main_t *nm = &nat64_main;
+  vlib_main_t **worker_vms = 0, *worker_vm;
+  int i;
+  uword event_type, *event_data = 0;
+
+  if (vec_len (vlib_mains) == 0)
+    vec_add1 (worker_vms, vm);
+  else
+    {
+      for (i = 0; i < vec_len (vlib_mains); i++)
+	{
+	  worker_vm = vlib_mains[i];
+	  if (worker_vm)
+	    vec_add1 (worker_vms, worker_vm);
+	}
+    }
+
+  while (1)
+    {
+      if (nm->total_enabled_count)
+	{
+	  vlib_process_wait_for_event_or_clock (vm, 10.0);
+	  event_type = vlib_process_get_events (vm, &event_data);
+	}
+      else
+	{
+	  vlib_process_wait_for_event (vm);
+	  event_type = vlib_process_get_events (vm, &event_data);
+	}
+
+      switch (event_type)
+	{
+	case ~0:
+	  break;
+	case NAT64_CLEANER_RESCHEDULE:
+	  break;
+	default:
+	  nat64_log_err ("unknown event %u", event_type);
+	  break;
+	}
+
+      for (i = 0; i < vec_len (worker_vms); i++)
+	{
+	  worker_vm = worker_vms[i];
+	  vlib_node_set_interrupt_pending (worker_vm,
+					   nm->expire_worker_walk_node_index);
+	}
+    }
+
+  return 0;
+}
+
+void
+nat64_create_expire_walk_process ()
+{
+  nat64_main_t *nm = &nat64_main;
+
+  if (nm->expire_walk_node_index)
+    return;
+  nm->expire_walk_node_index = vlib_process_create (vlib_get_main (),
+						    "nat64-expire-walk",
+						    nat64_expire_walk_fn,
+						    16 /* stack_bytes */ );
+}
+
+int
+nat64_plugin_enable (nat64_config_t c)
+{
+  nat64_main_t *nm = &nat64_main;
+
+  if (plugin_enabled () == 1)
+    {
+      nat64_log_err ("plugin already enabled!");
+      return 1;
+    }
+
+  if (!c.bib_buckets)
+    c.bib_buckets = 1024;
+
+  if (!c.bib_memory_size)
+    c.bib_memory_size = 128 << 20;
+
+  if (!c.st_buckets)
+    c.st_buckets = 2048;
+
+  if (!c.st_memory_size)
+    c.st_memory_size = 256 << 20;
+
+  nm->config = c;
+
+  if (nat64_init_hash (c))
+    {
+      nat64_log_err ("initializing hashes failed!");
+      return 1;
+    }
+
+  nat64_create_expire_walk_process ();
+
+  nm->enabled = 1;
+  return 0;
+}
+
+int
+nat64_plugin_disable ()
+{
+  nat64_main_t *nm = &nat64_main;
+  vnet_main_t *vnm = vnet_get_main ();
+  int rv = 0;
+
+  nat64_address_t *a;
+  nat64_interface_t *i, *interfaces;
+
+  if (plugin_enabled () == 0)
+    {
+      nat64_log_err ("plugin already disabled!");
+      return 1;
+    }
+  nm->enabled = 0;
+
+  interfaces = vec_dup (nm->interfaces);
+  vec_foreach (i, interfaces)
+  {
+    rv = nat64_interface_add_del (i->sw_if_index, i->flags, 1);
+    if (rv)
+      {
+	nat64_log_err ("%U %s interface del failed",
+		       unformat_vnet_sw_interface,
+		       i->flags & NAT64_INTERFACE_FLAG_IS_INSIDE ?
+		       "inside" : "outside", vnm, i->sw_if_index);
+      }
+  }
+  vec_free (interfaces);
+  pool_free (nm->interfaces);
+
+  nat64_reset_timeouts ();
+
+  if (nat64_free_hash ())
+    {
+      rv = 1;
+      nat64_log_err ("freeing hashes failed!");
+    }
+
+  // TODO: based on nat64_add_del_prefix fib_table_unlock is not called
+  vec_free (nm->pref64);
+
+  if (vec_len (nm->addr_pool))
+    {
+      vec_foreach (a, nm->addr_pool)
+      {
+	if (a->fib_index != ~0)
+	  fib_table_unlock (a->fib_index, FIB_PROTOCOL_IP6, nm->fib_src_hi);
+      }
+      vec_free (nm->addr_pool);
+    }
+  return rv;
+}
+
+uword
+unformat_nat_protocol (unformat_input_t * input, va_list * args)
+{
+  u32 *r = va_arg (*args, u32 *);
+
+  if (0);
+#define _(N, i, n, s) else if (unformat (input, s)) *r = NAT_PROTOCOL_##N;
+  foreach_nat_protocol
+#undef _
+    else
+    return 0;
+  return 1;
+}
+
+u8 *
+format_nat_protocol (u8 * s, va_list * args)
+{
+  u32 i = va_arg (*args, u32);
+  u8 *t = 0;
+
+  switch (i)
+    {
+#define _(N, j, n, str) case NAT_PROTOCOL_##N: t = (u8 *) str; break;
+      foreach_nat_protocol
+#undef _
+    default:
+      s = format (s, "unknown");
+      return s;
+    }
+  s = format (s, "%s", t);
+  return s;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/nat/nat64/nat64.h b/src/plugins/nat/nat64/nat64.h
new file mode 100644
index 00000000000..1180f9df778
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64.h
@@ -0,0 +1,531 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+#ifndef __included_nat64_h__
+#define __included_nat64_h__
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/icmp46_packet.h>
+#include <vnet/api_errno.h>
+#include <vnet/fib/fib_source.h>
+#include <vppinfra/dlist.h>
+#include <vppinfra/error.h>
+#include <vlibapi/api.h>
+#include <vlib/log.h>
+#include <vnet/fib/fib_table.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/ip/reass/ip4_sv_reass.h>
+
+#include <nat/lib/lib.h>
+#include <nat/lib/inlines.h>
+#include <nat/lib/nat_inlines.h>
+
+#include <nat/nat64/nat64_db.h>
+
+typedef struct
+{
+  u16 identifier;
+  u16 sequence;
+} icmp_echo_header_t;
+
+typedef struct
+{
+  u16 src_port, dst_port;
+} tcp_udp_header_t;
+
+#define foreach_nat64_tcp_ses_state            \
+  _(0, CLOSED, "closed")                       \
+  _(1, V4_INIT, "v4-init")                     \
+  _(2, V6_INIT, "v6-init")                     \
+  _(3, ESTABLISHED, "established")             \
+  _(4, V4_FIN_RCV, "v4-fin-rcv")               \
+  _(5, V6_FIN_RCV, "v6-fin-rcv")               \
+  _(6, V6_FIN_V4_FIN_RCV, "v6-fin-v4-fin-rcv") \
+  _(7, TRANS, "trans")
+
+typedef enum
+{
+#define _(v, N, s) NAT64_TCP_STATE_##N = v,
+  foreach_nat64_tcp_ses_state
+#undef _
+} nat64_tcp_ses_state_t;
+
+typedef enum
+{
+  NAT64_CLEANER_RESCHEDULE = 1,
+} nat64_cleaner_process_event_e;
+
+typedef struct
+{
+  ip6_address_t prefix;
+  u8 plen;
+  u32 vrf_id;
+  u32 fib_index;
+} nat64_prefix_t;
+
+typedef struct
+{
+  ip6_address_t in_addr;
+  u16 in_port;
+  ip4_address_t out_addr;
+  u16 out_port;
+  u32 fib_index;
+  u32 thread_index;
+  u8 proto;
+  u8 is_add;
+  u8 done;
+} nat64_static_bib_to_update_t;
+
+typedef struct
+{
+  ip4_address_t addr;
+  u32 fib_index;
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+  u16 busy_##n##_ports; \
+  u16 * busy_##n##_ports_per_thread; \
+  u32 busy_##n##_port_refcounts[65535];
+  foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+} nat64_address_t;
+
+typedef struct
+{
+  u32 sw_if_index;
+  u8 flags;
+} nat64_interface_t;
+
+typedef struct
+{
+  u32 enabled;
+
+  nat64_config_t config;
+
+  /* API message ID base */
+  u16 msg_id_base;
+
+  /* log class */
+  vlib_log_class_t log_class;
+
+  /** Interface pool */
+  nat64_interface_t *interfaces;
+
+  /** Address pool vector */
+  nat64_address_t *addr_pool;
+
+  /** sw_if_indices whose interface addresses should be auto-added */
+  u32 *auto_add_sw_if_indices;
+
+  /** Pref64 vector */
+  nat64_prefix_t *pref64;
+
+  /** BIB and session DB per thread */
+  nat64_db_t *db;
+
+  /** Worker handoff */
+  u32 fq_in2out_index;
+  u32 fq_out2in_index;
+
+  /** Pool of static BIB entries to be added/deleted in worker threads */
+  nat64_static_bib_to_update_t *static_bibs;
+
+  /** config parameters */
+  u32 bib_buckets;
+  uword bib_memory_size;
+  u32 st_buckets;
+  uword st_memory_size;
+
+  /** values of various timeouts */
+  u32 udp_timeout;
+  u32 icmp_timeout;
+  u32 tcp_trans_timeout;
+  u32 tcp_est_timeout;
+
+  /* Total count of interfaces enabled */
+  u32 total_enabled_count;
+
+  /* Expire walk process node index */
+  u32 expire_walk_node_index;
+
+  /* Expire worker walk process node index */
+  u32 expire_worker_walk_node_index;
+
+  /* counters/gauges */
+  vlib_simple_counter_main_t total_bibs;
+  vlib_simple_counter_main_t total_sessions;
+
+  /** node index **/
+  u32 error_node_index;
+
+  u32 in2out_node_index;
+  u32 in2out_slowpath_node_index;
+
+  u32 out2in_node_index;
+
+#define _(x) vlib_simple_counter_main_t x;
+  struct
+  {
+    struct
+    {
+      foreach_nat_counter;
+    } in2out;
+
+    struct
+    {
+      foreach_nat_counter;
+    } out2in;
+  } counters;
+#undef _
+
+  /* convenience */
+  ip4_main_t *ip4_main;
+
+  /* required */
+  vnet_main_t *vnet_main;
+
+  /* Randomize port allocation order */
+  u32 random_seed;
+
+  /* TCP MSS clamping */
+  u16 mss_clamping;
+
+  fib_source_t fib_src_hi;
+  fib_source_t fib_src_low;
+
+  /* Thread settings */
+  u32 num_workers;
+  u32 first_worker_index;
+  u32 *workers;
+  u16 port_per_thread;
+
+} nat64_main_t;
+
+extern nat64_main_t nat64_main;
+extern vlib_node_registration_t nat64_in2out_node;
+extern vlib_node_registration_t nat64_out2in_node;
+
+/**
+ * @brief Add/delete address to NAT64 pool.
+ *
+ * @param thread_index Thread index used by ipfix nat logging (not address per thread).
+ * @param addr   IPv4 address.
+ * @param vrf_id VRF id of tenant, ~0 means independent of VRF.
+ * @param is_add 1 if add, 0 if delete.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_add_del_pool_addr (u32 thread_index,
+			     ip4_address_t * addr, u32 vrf_id, u8 is_add);
+
+/**
+ * @brief Call back function when walking addresses in NAT64 pool, non-zero
+ * return value stop walk.
+ */
+typedef int (*nat64_pool_addr_walk_fn_t) (nat64_address_t * addr, void *ctx);
+
+/**
+ * @brief Walk NAT64 pool.
+ *
+ * @param fn The function to invoke on each entry visited.
+ * @param ctx A context passed in the visit function.
+ */
+void nat64_pool_addr_walk (nat64_pool_addr_walk_fn_t fn, void *ctx);
+
+/**
+ * @brief NAT64 pool address from specific (DHCP addressed) interface.
+ *
+ * @param sw_if_index Index of the interface.
+ * @param is_add      1 if add, 0 if delete.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_add_interface_address (u32 sw_if_index, int is_add);
+
+/**
+ * @brief Enable/disable NAT64 feature on the interface.
+ *
+ * @param sw_if_index Index of the interface.
+ * @param is_inside   1 if inside, 0 if outside.
+ * @param is_add      1 if add, 0 if delete.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_interface_add_del (u32 sw_if_index, u8 is_inside, u8 is_add);
+
+/**
+ * @brief Call back function when walking interfaces with NAT64 feature,
+ * non-zero return value stop walk.
+ */
+typedef int (*nat64_interface_walk_fn_t) (nat64_interface_t * i, void *ctx);
+
+/**
+ * @brief Walk NAT64 interfaces.
+ *
+ * @param fn The function to invoke on each entry visited.
+ * @param ctx A context passed in the visit function.
+ */
+void nat64_interfaces_walk (nat64_interface_walk_fn_t fn, void *ctx);
+
+/**
+ * @brief Initialize NAT64.
+ *
+ * @param vm vlib main.
+ *
+ * @return error code.
+ */
+clib_error_t *nat64_init (vlib_main_t * vm);
+
+/**
+ * @brief Add/delete static NAT64 BIB entry.
+ *
+ * @param in_addr  Inside IPv6 address.
+ * @param out_addr Outside IPv4 address.
+ * @param in_port  Inside port number.
+ * @param out_port Outside port number.
+ * @param proto    L4 protocol.
+ * @param vrf_id   VRF id of tenant.
+ * @param is_add   1 if add, 0 if delete.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_add_del_static_bib_entry (ip6_address_t * in_addr,
+				    ip4_address_t * out_addr, u16 in_port,
+				    u16 out_port, u8 proto, u32 vrf_id,
+				    u8 is_add);
+
+/**
+ * @brief Alloce IPv4 address and port pair from NAT64 pool.
+ *
+ * @param fib_index    FIB index of tenant.
+ * @param proto        L4 protocol.
+ * @param addr         Allocated IPv4 address.
+ * @param port         Allocated port number.
+ * @param thread_index Thread index.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_alloc_out_addr_and_port (u32 fib_index, nat_protocol_t proto,
+				   ip4_address_t * addr, u16 * port,
+				   u32 thread_index);
+
+/**
+ * @brief Set UDP session timeout.
+ *
+ * @param timeout Timeout value in seconds (if 0 reset to default value 300sec).
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_set_udp_timeout (u32 timeout);
+
+/**
+ * @brief Get UDP session timeout.
+ *
+ * @returns UDP session timeout in seconds.
+ */
+u32 nat64_get_udp_timeout (void);
+
+/**
+ * @brief Set ICMP session timeout.
+ *
+ * @param timeout Timeout value in seconds (if 0 reset to default value 60sec).
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_set_icmp_timeout (u32 timeout);
+
+/**
+ * @brief Get ICMP session timeout.
+ *
+ * @returns ICMP session timeout in seconds.
+ */
+u32 nat64_get_icmp_timeout (void);
+
+/**
+ * @brief Set TCP session timeouts.
+ *
+ * @param trans Transitory timeout in seconds (if 0 reset to default value 240sec).
+ * @param est Established timeout in seconds (if 0 reset to default value 7440sec).
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_set_tcp_timeouts (u32 trans, u32 est);
+
+/**
+ * @brief Get TCP transitory timeout.
+ *
+ * @returns TCP transitory timeout in seconds.
+ */
+u32 nat64_get_tcp_trans_timeout (void);
+
+/**
+ * @brief Get TCP established timeout.
+ *
+ * @returns TCP established timeout in seconds.
+ */
+u32 nat64_get_tcp_est_timeout (void);
+
+/**
+ * @brief Reset NAT64 session timeout.
+ *
+ * @param ste Session table entry.
+ * @param vm VLIB main.
+ **/
+void nat64_session_reset_timeout (nat64_db_st_entry_t * ste,
+				  vlib_main_t * vm);
+
+/**
+ * @brief Set NAT64 TCP session state.
+ *
+ * @param ste Session table entry.
+ * @param tcp TCP header.
+ * @param is_ip6 1 if IPv6 packet, 0 if IPv4.
+ */
+void nat64_tcp_session_set_state (nat64_db_st_entry_t * ste,
+				  tcp_header_t * tcp, u8 is_ip6);
+
+/**
+ * @brief Add/delete NAT64 prefix.
+ *
+ * @param prefix NAT64 prefix.
+ * @param plen Prefix length.
+ * @param vrf_id VRF id of tenant.
+ * @param is_add 1 if add, 0 if delete.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_add_del_prefix (ip6_address_t * prefix, u8 plen, u32 vrf_id,
+			  u8 is_add);
+
+/**
+ * @brief Call back function when walking addresses in NAT64 prefixes, non-zero
+ * return value stop walk.
+ */
+typedef int (*nat64_prefix_walk_fn_t) (nat64_prefix_t * pref64, void *ctx);
+
+/**
+ * @brief Walk NAT64 prefixes.
+ *
+ * @param fn The function to invoke on each entry visited.
+ * @param ctx A context passed in the visit function.
+ */
+void nat64_prefix_walk (nat64_prefix_walk_fn_t fn, void *ctx);
+
+/**
+ * Compose IPv4-embedded IPv6 addresses.
+ * @param ip6 IPv4-embedded IPv6 addresses.
+ * @param ip4 IPv4 address.
+ * @param fib_index Tenant FIB index.
+ */
+void nat64_compose_ip6 (ip6_address_t * ip6, ip4_address_t * ip4,
+			u32 fib_index);
+
+/**
+ * Extract IPv4 address from the IPv4-embedded IPv6 addresses.
+ *
+ * @param ip6 IPv4-embedded IPv6 addresses.
+ * @param ip4 IPv4 address.
+ * @param fib_index Tenant FIB index.
+ */
+void nat64_extract_ip4 (ip6_address_t * ip6, ip4_address_t * ip4,
+			u32 fib_index);
+
+/**
+ * @brief Set NAT64 hash tables configuration.
+ *
+ * @param bib_buckets Number of BIB hash buckets.
+ * @param bib_memory_size Memory size of BIB hash.
+ * @param st_buckets Number of session table hash buckets.
+ * @param st_memory_size Memory size of session table hash.
+ */
+void nat64_set_hash (u32 bib_buckets, uword bib_memory_size, u32 st_buckets,
+		     uword st_memory_size);
+
+/**
+ * @brief Get worker thread index for NAT64 in2out.
+ *
+ * @param addr IPv6 src address.
+ *
+ * @returns worker thread index.
+ */
+u32 nat64_get_worker_in2out (ip6_address_t * addr);
+
+/**
+ * @brief Get worker thread index for NAT64 out2in.
+ *
+ * @param ip IPv4 header.
+ *
+ * @returns worker thread index.
+ */
+u32 nat64_get_worker_out2in (vlib_buffer_t * b, ip4_header_t * ip);
+
+/* NAT64 interface flags */
+#define NAT64_INTERFACE_FLAG_IS_INSIDE 1
+#define NAT64_INTERFACE_FLAG_IS_OUTSIDE 2
+
+/** \brief Check if NAT64 interface is inside.
+    @param i NAT64 interface
+    @return 1 if inside interface
+*/
+#define nat64_interface_is_inside(i) i->flags & NAT64_INTERFACE_FLAG_IS_INSIDE
+
+/** \brief Check if NAT64 interface is outside.
+    @param i NAT64 interface
+    @return 1 if outside interface
+*/
+#define nat64_interface_is_outside(i) i->flags & NAT64_INTERFACE_FLAG_IS_OUTSIDE
+
+static_always_inline u8
+plugin_enabled ()
+{
+  nat64_main_t *nm = &nat64_main;
+  return nm->enabled;
+}
+
+void
+nat64_add_del_addr_to_fib (ip4_address_t * addr, u8 p_len, u32 sw_if_index,
+			   int is_add);
+
+int nat64_plugin_enable (nat64_config_t c);
+int nat64_plugin_disable ();
+void nat64_reset_timeouts ();
+
+format_function_t format_nat_protocol;
+unformat_function_t unformat_nat_protocol;
+
+/* logging */
+#define nat64_log_err(...) \
+  vlib_log(VLIB_LOG_LEVEL_ERR, nat64_main.log_class, __VA_ARGS__)
+#define nat64_log_warn(...) \
+  vlib_log(VLIB_LOG_LEVEL_WARNING, nat64_main.log_class, __VA_ARGS__)
+#define nat64_log_notice(...) \
+  vlib_log(VLIB_LOG_LEVEL_NOTICE, nat64_main.log_class, __VA_ARGS__)
+#define nat64_log_info(...) \
+  vlib_log(VLIB_LOG_LEVEL_INFO, nat64_main.log_class, __VA_ARGS__)
+#define nat64_log_debug(...)\
+  vlib_log(VLIB_LOG_LEVEL_DEBUG, nat64_main.log_class, __VA_ARGS__)
+
+clib_error_t *nat64_api_hookup (vlib_main_t * vm);
+
+#endif /* __included_nat64_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/nat/nat64/nat64_api.c b/src/plugins/nat/nat64/nat64_api.c
new file mode 100644
index 00000000000..e64b6434fd2
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64_api.c
@@ -0,0 +1,458 @@
+/*
+ * Copyright (c) 2020 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 <vnet/ip/ip_types_api.h>
+#include <vlibmemory/api.h>
+#include <nat/nat64/nat64.h>
+#include <nat/nat64/nat64.api_enum.h>
+#include <nat/nat64/nat64.api_types.h>
+#include <vnet/fib/fib_table.h>
+#include <vnet/ip/ip.h>
+
+#define REPLY_MSG_ID_BASE nm->msg_id_base
+#include <vlibapi/api_helper_macros.h>
+
+static void
+  vl_api_nat64_plugin_enable_disable_t_handler
+  (vl_api_nat64_plugin_enable_disable_t * mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_plugin_enable_disable_reply_t *rmp;
+  nat64_config_t c = { 0 };
+  int rv = 0;
+  if (mp->enable)
+    {
+      c.bib_buckets = ntohl (mp->bib_buckets);
+      c.bib_memory_size = ntohl (mp->bib_memory_size);
+      c.st_buckets = ntohl (mp->st_buckets);
+      c.st_memory_size = ntohl (mp->st_memory_size);
+      rv = nat64_plugin_enable (c);
+    }
+  else
+    {
+      rv = nat64_plugin_disable ();
+    }
+  REPLY_MACRO (VL_API_NAT64_PLUGIN_ENABLE_DISABLE_REPLY);
+}
+
+static void
+vl_api_nat64_set_timeouts_t_handler (vl_api_nat64_set_timeouts_t * mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_set_timeouts_reply_t *rmp;
+  int rv = 0;
+
+  nm->udp_timeout = ntohl (mp->udp);
+  nm->tcp_est_timeout = ntohl (mp->tcp_established);
+  nm->tcp_trans_timeout = ntohl (mp->tcp_transitory);
+  nm->icmp_timeout = ntohl (mp->icmp);
+
+  REPLY_MACRO (VL_API_NAT64_SET_TIMEOUTS_REPLY);
+}
+
+static void
+vl_api_nat64_get_timeouts_t_handler (vl_api_nat64_get_timeouts_t * mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_get_timeouts_reply_t *rmp;
+  int rv = 0;
+
+  /* *INDENT-OFF* */
+  REPLY_MACRO2 (VL_API_NAT64_GET_TIMEOUTS_REPLY,
+  ({
+    rmp->udp = htonl (nm->udp_timeout);
+    rmp->tcp_established = htonl (nm->tcp_est_timeout);
+    rmp->tcp_transitory = htonl (nm->tcp_trans_timeout);
+    rmp->icmp = htonl (nm->icmp_timeout);
+  }))
+  /* *INDENT-ON* */
+}
+
+static void
+  vl_api_nat64_add_del_pool_addr_range_t_handler
+  (vl_api_nat64_add_del_pool_addr_range_t * mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_add_del_pool_addr_range_reply_t *rmp;
+  int rv = 0;
+  ip4_address_t this_addr;
+  u32 start_host_order, end_host_order;
+  u32 vrf_id;
+  int i, count;
+  u32 *tmp;
+
+  tmp = (u32 *) mp->start_addr;
+  start_host_order = clib_host_to_net_u32 (tmp[0]);
+  tmp = (u32 *) mp->end_addr;
+  end_host_order = clib_host_to_net_u32 (tmp[0]);
+
+  count = (end_host_order - start_host_order) + 1;
+
+  vrf_id = clib_host_to_net_u32 (mp->vrf_id);
+
+  memcpy (&this_addr.as_u8, mp->start_addr, 4);
+
+  for (i = 0; i < count; i++)
+    {
+      if ((rv = nat64_add_del_pool_addr (0, &this_addr, vrf_id, mp->is_add)))
+	goto send_reply;
+
+      increment_v4_address (&this_addr);
+    }
+
+send_reply:
+  REPLY_MACRO (VL_API_NAT64_ADD_DEL_POOL_ADDR_RANGE_REPLY);
+}
+
+typedef struct nat64_api_walk_ctx_t_
+{
+  vl_api_registration_t *reg;
+  u32 context;
+  nat64_db_t *db;
+} nat64_api_walk_ctx_t;
+
+static int
+nat64_api_pool_walk (nat64_address_t * a, void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_pool_addr_details_t *rmp;
+  nat64_api_walk_ctx_t *ctx = arg;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_NAT64_POOL_ADDR_DETAILS + nm->msg_id_base);
+  clib_memcpy (rmp->address, &(a->addr), 4);
+  if (a->fib_index != ~0)
+    {
+      fib_table_t *fib = fib_table_get (a->fib_index, FIB_PROTOCOL_IP6);
+      if (!fib)
+	return -1;
+      rmp->vrf_id = ntohl (fib->ft_table_id);
+    }
+  else
+    rmp->vrf_id = ~0;
+  rmp->context = ctx->context;
+
+  vl_api_send_msg (ctx->reg, (u8 *) rmp);
+
+  return 0;
+}
+
+static void
+vl_api_nat64_pool_addr_dump_t_handler (vl_api_nat64_pool_addr_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  nat64_api_walk_ctx_t ctx = {
+    .reg = reg,
+    .context = mp->context,
+  };
+
+  nat64_pool_addr_walk (nat64_api_pool_walk, &ctx);
+}
+
+static void
+vl_api_nat64_add_del_interface_t_handler (vl_api_nat64_add_del_interface_t *
+					  mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_add_del_interface_reply_t *rmp;
+  int rv = 0;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  rv =
+    nat64_interface_add_del (ntohl (mp->sw_if_index),
+			     mp->flags & NAT_API_IS_INSIDE, mp->is_add);
+
+  BAD_SW_IF_INDEX_LABEL;
+
+  REPLY_MACRO (VL_API_NAT64_ADD_DEL_INTERFACE_REPLY);
+}
+
+static int
+nat64_api_interface_walk (nat64_interface_t * i, void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_interface_details_t *rmp;
+  nat64_api_walk_ctx_t *ctx = arg;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_NAT64_INTERFACE_DETAILS + nm->msg_id_base);
+  rmp->sw_if_index = ntohl (i->sw_if_index);
+
+  if (nat64_interface_is_inside (i))
+    rmp->flags |= NAT_API_IS_INSIDE;
+  if (nat64_interface_is_outside (i))
+    rmp->flags |= NAT_API_IS_OUTSIDE;
+
+  rmp->context = ctx->context;
+
+  vl_api_send_msg (ctx->reg, (u8 *) rmp);
+
+  return 0;
+}
+
+static void
+vl_api_nat64_interface_dump_t_handler (vl_api_nat64_interface_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  nat64_api_walk_ctx_t ctx = {
+    .reg = reg,
+    .context = mp->context,
+  };
+
+  nat64_interfaces_walk (nat64_api_interface_walk, &ctx);
+}
+
+static void
+  vl_api_nat64_add_del_static_bib_t_handler
+  (vl_api_nat64_add_del_static_bib_t * mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_add_del_static_bib_reply_t *rmp;
+  ip6_address_t in_addr;
+  ip4_address_t out_addr;
+  int rv = 0;
+
+  memcpy (&in_addr.as_u8, mp->i_addr, 16);
+  memcpy (&out_addr.as_u8, mp->o_addr, 4);
+
+  rv =
+    nat64_add_del_static_bib_entry (&in_addr, &out_addr,
+				    clib_net_to_host_u16 (mp->i_port),
+				    clib_net_to_host_u16 (mp->o_port),
+				    mp->proto,
+				    clib_net_to_host_u32 (mp->vrf_id),
+				    mp->is_add);
+
+  REPLY_MACRO (VL_API_NAT64_ADD_DEL_STATIC_BIB_REPLY);
+}
+
+static int
+nat64_api_bib_walk (nat64_db_bib_entry_t * bibe, void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_bib_details_t *rmp;
+  nat64_api_walk_ctx_t *ctx = arg;
+  fib_table_t *fib;
+
+  fib = fib_table_get (bibe->fib_index, FIB_PROTOCOL_IP6);
+  if (!fib)
+    return -1;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_NAT64_BIB_DETAILS + nm->msg_id_base);
+  rmp->context = ctx->context;
+  clib_memcpy (rmp->i_addr, &(bibe->in_addr), 16);
+  clib_memcpy (rmp->o_addr, &(bibe->out_addr), 4);
+  rmp->i_port = bibe->in_port;
+  rmp->o_port = bibe->out_port;
+  rmp->vrf_id = ntohl (fib->ft_table_id);
+  rmp->proto = bibe->proto;
+  if (bibe->is_static)
+    rmp->flags |= NAT_API_IS_STATIC;
+  rmp->ses_num = ntohl (bibe->ses_num);
+
+  vl_api_send_msg (ctx->reg, (u8 *) rmp);
+
+  return 0;
+}
+
+static void
+vl_api_nat64_bib_dump_t_handler (vl_api_nat64_bib_dump_t * mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_registration_t *reg;
+  nat64_db_t *db;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  nat64_api_walk_ctx_t ctx = {
+    .reg = reg,
+    .context = mp->context,
+  };
+
+  /* *INDENT-OFF* */
+  vec_foreach (db, nm->db)
+    nat64_db_bib_walk (db, mp->proto, nat64_api_bib_walk, &ctx);
+  /* *INDENT-ON* */
+}
+
+static int
+nat64_api_st_walk (nat64_db_st_entry_t * ste, void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_st_details_t *rmp;
+  nat64_api_walk_ctx_t *ctx = arg;
+  nat64_db_bib_entry_t *bibe;
+  fib_table_t *fib;
+
+  bibe = nat64_db_bib_entry_by_index (ctx->db, ste->proto, ste->bibe_index);
+  if (!bibe)
+    return -1;
+
+  fib = fib_table_get (bibe->fib_index, FIB_PROTOCOL_IP6);
+  if (!fib)
+    return -1;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_NAT64_ST_DETAILS + nm->msg_id_base);
+  rmp->context = ctx->context;
+  clib_memcpy (rmp->il_addr, &(bibe->in_addr), 16);
+  clib_memcpy (rmp->ol_addr, &(bibe->out_addr), 4);
+  rmp->il_port = bibe->in_port;
+  rmp->ol_port = bibe->out_port;
+  clib_memcpy (rmp->ir_addr, &(ste->in_r_addr), 16);
+  clib_memcpy (rmp->or_addr, &(ste->out_r_addr), 4);
+  rmp->il_port = ste->r_port;
+  rmp->vrf_id = ntohl (fib->ft_table_id);
+  rmp->proto = ste->proto;
+
+  vl_api_send_msg (ctx->reg, (u8 *) rmp);
+
+  return 0;
+}
+
+static void
+vl_api_nat64_st_dump_t_handler (vl_api_nat64_st_dump_t * mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_registration_t *reg;
+  nat64_db_t *db;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  nat64_api_walk_ctx_t ctx = {
+    .reg = reg,
+    .context = mp->context,
+  };
+
+  /* *INDENT-OFF* */
+  vec_foreach (db, nm->db)
+    {
+      ctx.db = db;
+      nat64_db_st_walk (db, mp->proto, nat64_api_st_walk, &ctx);
+    }
+  /* *INDENT-ON* */
+}
+
+static void
+vl_api_nat64_add_del_prefix_t_handler (vl_api_nat64_add_del_prefix_t * mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_add_del_prefix_reply_t *rmp;
+  ip6_address_t prefix;
+  int rv = 0;
+
+  memcpy (&prefix.as_u8, mp->prefix.address, 16);
+
+  rv =
+    nat64_add_del_prefix (&prefix, mp->prefix.len,
+			  clib_net_to_host_u32 (mp->vrf_id), mp->is_add);
+  REPLY_MACRO (VL_API_NAT64_ADD_DEL_PREFIX_REPLY);
+}
+
+static int
+nat64_api_prefix_walk (nat64_prefix_t * p, void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_prefix_details_t *rmp;
+  nat64_api_walk_ctx_t *ctx = arg;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_NAT64_PREFIX_DETAILS + nm->msg_id_base);
+  clib_memcpy (rmp->prefix.address, &(p->prefix), 16);
+  rmp->prefix.len = p->plen;
+  rmp->vrf_id = ntohl (p->vrf_id);
+  rmp->context = ctx->context;
+
+  vl_api_send_msg (ctx->reg, (u8 *) rmp);
+
+  return 0;
+}
+
+static void
+vl_api_nat64_prefix_dump_t_handler (vl_api_nat64_prefix_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  nat64_api_walk_ctx_t ctx = {
+    .reg = reg,
+    .context = mp->context,
+  };
+
+  nat64_prefix_walk (nat64_api_prefix_walk, &ctx);
+}
+
+static void
+  vl_api_nat64_add_del_interface_addr_t_handler
+  (vl_api_nat64_add_del_interface_addr_t * mp)
+{
+  nat64_main_t *nm = &nat64_main;
+  vl_api_nat64_add_del_interface_addr_reply_t *rmp;
+  u32 sw_if_index = ntohl (mp->sw_if_index);
+  int rv = 0;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  rv = nat64_add_interface_address (sw_if_index, mp->is_add);
+
+  BAD_SW_IF_INDEX_LABEL;
+
+  REPLY_MACRO (VL_API_NAT64_ADD_DEL_INTERFACE_ADDR_REPLY);
+}
+
+/* API definitions */
+#include <vnet/format_fns.h>
+#include <nat/nat64/nat64.api.c>
+
+/* Set up the API message handling tables */
+clib_error_t *
+nat64_api_hookup (vlib_main_t * vm)
+{
+  nat64_main_t *nm = &nat64_main;
+  nm->msg_id_base = setup_message_id_table ();
+  return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/nat/nat64/nat64_cli.c b/src/plugins/nat/nat64/nat64_cli.c
new file mode 100644
index 00000000000..a7dd9ab9147
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64_cli.c
@@ -0,0 +1,992 @@
+/*
+ * Copyright (c) 2020 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 <vnet/fib/fib_table.h>
+#include <nat/nat64/nat64.h>
+
+static clib_error_t *
+nat64_plugin_enable_disable_command_fn (vlib_main_t * vm,
+					unformat_input_t * input,
+					vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  u8 enable = 0, is_set = 0;
+  clib_error_t *error = 0;
+  nat64_config_t c = { 0 };
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (!is_set && unformat (line_input, "enable"))
+	{
+	  unformat (line_input, "bib-buckets %u", &c.bib_buckets);
+	  unformat (line_input, "bib-memory %u", &c.bib_memory_size);
+	  unformat (line_input, "st-buckets %u", &c.st_buckets);
+	  unformat (line_input, "st-memory %u", &c.st_memory_size);
+	  enable = 1;
+	}
+      else if (!is_set && unformat (line_input, "disable"));
+      else
+	{
+	  error = clib_error_return (0, "unknown input '%U'",
+				     format_unformat_error, line_input);
+	  goto done;
+	}
+      is_set = 1;
+    }
+
+  if (enable)
+    {
+      if (nat64_plugin_enable (c))
+	error = clib_error_return (0, "plugin enable failed");
+    }
+  else
+    {
+      if (nat64_plugin_disable ())
+	error = clib_error_return (0, "plugin disable failed");
+    }
+done:
+  unformat_free (line_input);
+  return error;
+}
+
+static clib_error_t *
+nat64_add_del_pool_addr_command_fn (vlib_main_t * vm,
+				    unformat_input_t * input,
+				    vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  ip4_address_t start_addr, end_addr, this_addr;
+  u32 start_host_order, end_host_order;
+  int i, count, rv;
+  u32 vrf_id = ~0;
+  u8 is_add = 1;
+  clib_error_t *error = 0;
+
+  /* Get a line of input. */
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "%U - %U",
+		    unformat_ip4_address, &start_addr,
+		    unformat_ip4_address, &end_addr))
+	;
+      else if (unformat (line_input, "tenant-vrf %u", &vrf_id))
+	;
+      else if (unformat (line_input, "%U", unformat_ip4_address, &start_addr))
+	end_addr = start_addr;
+      else if (unformat (line_input, "del"))
+	is_add = 0;
+      else
+	{
+	  error = clib_error_return (0, "unknown input '%U'",
+				     format_unformat_error, line_input);
+	  goto done;
+	}
+    }
+
+  start_host_order = clib_host_to_net_u32 (start_addr.as_u32);
+  end_host_order = clib_host_to_net_u32 (end_addr.as_u32);
+
+  if (end_host_order < start_host_order)
+    {
+      error = clib_error_return (0, "end address less than start address");
+      goto done;
+    }
+
+  count = (end_host_order - start_host_order) + 1;
+  this_addr = start_addr;
+
+  for (i = 0; i < count; i++)
+    {
+      rv = nat64_add_del_pool_addr (0, &this_addr, vrf_id, is_add);
+
+      switch (rv)
+	{
+	case VNET_API_ERROR_NO_SUCH_ENTRY:
+	  error =
+	    clib_error_return (0, "NAT64 pool address %U not exist.",
+			       format_ip4_address, &this_addr);
+	  goto done;
+	case VNET_API_ERROR_VALUE_EXIST:
+	  error =
+	    clib_error_return (0, "NAT64 pool address %U exist.",
+			       format_ip4_address, &this_addr);
+	  goto done;
+	default:
+	  break;
+
+	}
+      increment_v4_address (&this_addr);
+    }
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+static int
+nat64_cli_pool_walk (nat64_address_t * ap, void *ctx)
+{
+  vlib_main_t *vm = ctx;
+
+  if (ap->fib_index != ~0)
+    {
+      fib_table_t *fib;
+      fib = fib_table_get (ap->fib_index, FIB_PROTOCOL_IP6);
+      if (!fib)
+	return -1;
+      vlib_cli_output (vm, " %U tenant VRF: %u", format_ip4_address,
+		       &ap->addr, fib->ft_table_id);
+    }
+  else
+    vlib_cli_output (vm, " %U", format_ip4_address, &ap->addr);
+
+#define _(N, i, n, s) \
+  vlib_cli_output (vm, "  %d busy %s ports", ap->busy_##n##_ports, s);
+  foreach_nat_protocol
+#undef _
+    return 0;
+}
+
+static clib_error_t *
+nat64_show_pool_command_fn (vlib_main_t * vm,
+			    unformat_input_t * input,
+			    vlib_cli_command_t * cmd)
+{
+  vlib_cli_output (vm, "NAT64 pool:");
+  nat64_pool_addr_walk (nat64_cli_pool_walk, vm);
+
+  return 0;
+}
+
+static clib_error_t *
+nat64_interface_feature_command_fn (vlib_main_t * vm,
+				    unformat_input_t *
+				    input, vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  vnet_main_t *vnm = vnet_get_main ();
+  clib_error_t *error = 0;
+  u32 sw_if_index;
+  u32 *inside_sw_if_indices = 0;
+  u32 *outside_sw_if_indices = 0;
+  u8 is_add = 1;
+  int i, rv;
+
+  /* Get a line of input. */
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "in %U", unformat_vnet_sw_interface,
+		    vnm, &sw_if_index))
+	vec_add1 (inside_sw_if_indices, sw_if_index);
+      else if (unformat (line_input, "out %U", unformat_vnet_sw_interface,
+			 vnm, &sw_if_index))
+	vec_add1 (outside_sw_if_indices, sw_if_index);
+      else if (unformat (line_input, "del"))
+	is_add = 0;
+      else
+	{
+	  error = clib_error_return (0, "unknown input '%U'",
+				     format_unformat_error, line_input);
+	  goto done;
+	}
+    }
+
+  if (vec_len (inside_sw_if_indices))
+    {
+      for (i = 0; i < vec_len (inside_sw_if_indices); i++)
+	{
+	  sw_if_index = inside_sw_if_indices[i];
+	  rv = nat64_interface_add_del (sw_if_index, 1, is_add);
+	  switch (rv)
+	    {
+	    case VNET_API_ERROR_NO_SUCH_ENTRY:
+	      error =
+		clib_error_return (0, "%U NAT64 feature not enabled.",
+				   format_vnet_sw_if_index_name, vnm,
+				   sw_if_index);
+	      goto done;
+	    case VNET_API_ERROR_VALUE_EXIST:
+	      error =
+		clib_error_return (0, "%U NAT64 feature already enabled.",
+				   format_vnet_sw_if_index_name, vnm,
+				   vnm, sw_if_index);
+	      goto done;
+	    case VNET_API_ERROR_INVALID_VALUE:
+	    case VNET_API_ERROR_INVALID_VALUE_2:
+	      error =
+		clib_error_return (0,
+				   "%U NAT64 feature enable/disable failed.",
+				   format_vnet_sw_if_index_name, vnm,
+				   sw_if_index);
+	      goto done;
+	    default:
+	      break;
+
+	    }
+	}
+    }
+
+  if (vec_len (outside_sw_if_indices))
+    {
+      for (i = 0; i < vec_len (outside_sw_if_indices); i++)
+	{
+	  sw_if_index = outside_sw_if_indices[i];
+	  rv = nat64_interface_add_del (sw_if_index, 0, is_add);
+	  switch (rv)
+	    {
+	    case VNET_API_ERROR_NO_SUCH_ENTRY:
+	      error =
+		clib_error_return (0, "%U NAT64 feature not enabled.",
+				   format_vnet_sw_if_index_name, vnm,
+				   sw_if_index);
+	      goto done;
+	    case VNET_API_ERROR_VALUE_EXIST:
+	      error =
+		clib_error_return (0, "%U NAT64 feature already enabled.",
+				   format_vnet_sw_if_index_name, vnm,
+				   sw_if_index);
+	      goto done;
+	    case VNET_API_ERROR_INVALID_VALUE:
+	    case VNET_API_ERROR_INVALID_VALUE_2:
+	      error =
+		clib_error_return (0,
+				   "%U NAT64 feature enable/disable failed.",
+				   format_vnet_sw_if_index_name, vnm,
+				   sw_if_index);
+	      goto done;
+	    default:
+	      break;
+
+	    }
+	}
+    }
+
+done:
+  unformat_free (line_input);
+  vec_free (inside_sw_if_indices);
+  vec_free (outside_sw_if_indices);
+
+  return error;
+}
+
+static int
+nat64_cli_interface_walk (nat64_interface_t * i, void *ctx)
+{
+  vlib_main_t *vm = ctx;
+  vnet_main_t *vnm = vnet_get_main ();
+
+  vlib_cli_output (vm, " %U %s", format_vnet_sw_if_index_name, vnm,
+		   i->sw_if_index,
+		   (nat64_interface_is_inside (i)
+		    && nat64_interface_is_outside (i)) ? "in out" :
+		   nat64_interface_is_inside (i) ? "in" : "out");
+  return 0;
+}
+
+static clib_error_t *
+nat64_show_interfaces_command_fn (vlib_main_t * vm,
+				  unformat_input_t *
+				  input, vlib_cli_command_t * cmd)
+{
+  vlib_cli_output (vm, "NAT64 interfaces:");
+  nat64_interfaces_walk (nat64_cli_interface_walk, vm);
+
+  return 0;
+}
+
+static clib_error_t *
+nat64_add_del_static_bib_command_fn (vlib_main_t *
+				     vm,
+				     unformat_input_t
+				     * input, vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  clib_error_t *error = 0;
+  u8 is_add = 1;
+  ip6_address_t in_addr;
+  ip4_address_t out_addr;
+  u32 in_port = 0;
+  u32 out_port = 0;
+  u32 vrf_id = 0, protocol;
+  nat_protocol_t proto = 0;
+  u8 p = 0;
+  int rv;
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "%U %u", unformat_ip6_address,
+		    &in_addr, &in_port))
+	;
+      else if (unformat (line_input, "%U %u", unformat_ip4_address,
+			 &out_addr, &out_port))
+	;
+      else if (unformat (line_input, "vrf %u", &vrf_id))
+	;
+      else if (unformat (line_input, "%U", unformat_nat_protocol, &proto))
+	;
+      else
+	if (unformat
+	    (line_input, "%U %U %u", unformat_ip6_address, &in_addr,
+	     unformat_ip4_address, &out_addr, &protocol))
+	p = (u8) protocol;
+      else if (unformat (line_input, "del"))
+	is_add = 0;
+      else
+	{
+	  error = clib_error_return (0, "unknown input: '%U'",
+				     format_unformat_error, line_input);
+	  goto done;
+	}
+    }
+
+  if (!p)
+    {
+      if (!in_port)
+	{
+	  error =
+	    clib_error_return (0, "inside port and address  must be set");
+	  goto done;
+	}
+
+      if (!out_port)
+	{
+	  error =
+	    clib_error_return (0, "outside port and address  must be set");
+	  goto done;
+	}
+
+      p = nat_proto_to_ip_proto (proto);
+    }
+
+  rv =
+    nat64_add_del_static_bib_entry (&in_addr, &out_addr, (u16) in_port,
+				    (u16) out_port, p, vrf_id, is_add);
+
+  switch (rv)
+    {
+    case VNET_API_ERROR_NO_SUCH_ENTRY:
+      error = clib_error_return (0, "NAT64 BIB entry not exist.");
+      goto done;
+    case VNET_API_ERROR_VALUE_EXIST:
+      error = clib_error_return (0, "NAT64 BIB entry exist.");
+      goto done;
+    case VNET_API_ERROR_UNSPECIFIED:
+      error = clib_error_return (0, "Crerate NAT64 BIB entry failed.");
+      goto done;
+    case VNET_API_ERROR_INVALID_VALUE:
+      error =
+	clib_error_return (0,
+			   "Outside address %U and port %u already in use.",
+			   format_ip4_address, &out_addr, out_port);
+      goto done;
+    case VNET_API_ERROR_INVALID_VALUE_2:
+      error = clib_error_return (0, "Invalid outside port.");
+    default:
+      break;
+    }
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+static int
+nat64_cli_bib_walk (nat64_db_bib_entry_t * bibe, void *ctx)
+{
+  vlib_main_t *vm = ctx;
+  fib_table_t *fib;
+
+  fib = fib_table_get (bibe->fib_index, FIB_PROTOCOL_IP6);
+  if (!fib)
+    return -1;
+
+  switch (bibe->proto)
+    {
+    case IP_PROTOCOL_ICMP:
+    case IP_PROTOCOL_TCP:
+    case IP_PROTOCOL_UDP:
+      vlib_cli_output (vm, " %U %u %U %u protocol %U vrf %u %s %u sessions",
+		       format_ip6_address, &bibe->in_addr,
+		       clib_net_to_host_u16 (bibe->in_port),
+		       format_ip4_address, &bibe->out_addr,
+		       clib_net_to_host_u16 (bibe->out_port),
+		       format_nat_protocol,
+		       ip_proto_to_nat_proto (bibe->proto), fib->ft_table_id,
+		       bibe->is_static ? "static" : "dynamic", bibe->ses_num);
+      break;
+    default:
+      vlib_cli_output (vm, " %U %U protocol %u vrf %u %s %u sessions",
+		       format_ip6_address, &bibe->in_addr,
+		       format_ip4_address, &bibe->out_addr,
+		       bibe->proto, fib->ft_table_id,
+		       bibe->is_static ? "static" : "dynamic", bibe->ses_num);
+    }
+  return 0;
+}
+
+static clib_error_t *
+nat64_show_bib_command_fn (vlib_main_t * vm,
+			   unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  nat64_main_t *nm = &nat64_main;
+  unformat_input_t _line_input, *line_input = &_line_input;
+  clib_error_t *error = 0;
+  u32 proto = NAT_PROTOCOL_OTHER;
+  u8 p = 255;
+  nat64_db_t *db;
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  if (unformat (line_input, "%U", unformat_nat_protocol, &proto))
+    p = nat_proto_to_ip_proto (proto);
+  else if (unformat (line_input, "unknown"))
+    p = 0;
+  else if (unformat (line_input, "all"))
+    ;
+  else
+    {
+      error = clib_error_return (0, "unknown input: '%U'",
+				 format_unformat_error, line_input);
+      goto done;
+    }
+
+  if (p == 255)
+    vlib_cli_output (vm, "NAT64 BIB entries:");
+  else
+    vlib_cli_output (vm, "NAT64 %U BIB entries:", format_nat_protocol, proto);
+
+  /* *INDENT-OFF* */
+  vec_foreach (db, nm->db)
+    nat64_db_bib_walk (db, p, nat64_cli_bib_walk, vm);
+  /* *INDENT-ON* */
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+typedef struct nat64_cli_st_walk_ctx_t_
+{
+  vlib_main_t *vm;
+  nat64_db_t *db;
+} nat64_cli_st_walk_ctx_t;
+
+static int
+nat64_cli_st_walk (nat64_db_st_entry_t * ste, void *arg)
+{
+  nat64_cli_st_walk_ctx_t *ctx = arg;
+  vlib_main_t *vm = ctx->vm;
+  nat64_db_bib_entry_t *bibe;
+  fib_table_t *fib;
+
+  bibe = nat64_db_bib_entry_by_index (ctx->db, ste->proto, ste->bibe_index);
+  if (!bibe)
+    return -1;
+
+  fib = fib_table_get (bibe->fib_index, FIB_PROTOCOL_IP6);
+  if (!fib)
+    return -1;
+
+  u32 vrf_id = fib->ft_table_id;
+
+  if (ste->proto == IP_PROTOCOL_ICMP)
+    vlib_cli_output (vm, " %U %U %u %U %U %u protocol %U vrf %u",
+		     format_ip6_address, &bibe->in_addr,
+		     format_ip6_address, &ste->in_r_addr,
+		     clib_net_to_host_u16 (bibe->in_port),
+		     format_ip4_address, &bibe->out_addr,
+		     format_ip4_address, &ste->out_r_addr,
+		     clib_net_to_host_u16 (bibe->out_port),
+		     format_nat_protocol,
+		     ip_proto_to_nat_proto (bibe->proto), vrf_id);
+  else if (ste->proto == IP_PROTOCOL_TCP || ste->proto == IP_PROTOCOL_UDP)
+    vlib_cli_output (vm, " %U %u %U %u %U %u %U %u protcol %U vrf %u",
+		     format_ip6_address, &bibe->in_addr,
+		     clib_net_to_host_u16 (bibe->in_port),
+		     format_ip6_address, &ste->in_r_addr,
+		     clib_net_to_host_u16 (ste->r_port),
+		     format_ip4_address, &bibe->out_addr,
+		     clib_net_to_host_u16 (bibe->out_port),
+		     format_ip4_address, &ste->out_r_addr,
+		     clib_net_to_host_u16 (ste->r_port),
+		     format_nat_protocol,
+		     ip_proto_to_nat_proto (bibe->proto), vrf_id);
+  else
+    vlib_cli_output (vm, " %U %U %U %U protocol %u vrf %u",
+		     format_ip6_address, &bibe->in_addr,
+		     format_ip6_address, &ste->in_r_addr,
+		     format_ip4_address, &bibe->out_addr,
+		     format_ip4_address, &ste->out_r_addr,
+		     bibe->proto, vrf_id);
+
+  return 0;
+}
+
+static clib_error_t *
+nat64_show_st_command_fn (vlib_main_t * vm,
+			  unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  nat64_main_t *nm = &nat64_main;
+  unformat_input_t _line_input, *line_input = &_line_input;
+  clib_error_t *error = 0;
+  u32 proto = NAT_PROTOCOL_OTHER;
+  u8 p = 255;
+  nat64_db_t *db;
+  nat64_cli_st_walk_ctx_t ctx = {
+    .vm = vm,
+  };
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  if (unformat (line_input, "%U", unformat_nat_protocol, &proto))
+    p = nat_proto_to_ip_proto (proto);
+  else if (unformat (line_input, "unknown"))
+    p = 0;
+  else if (unformat (line_input, "all"))
+    ;
+  else
+    {
+      error = clib_error_return (0, "unknown input: '%U'",
+				 format_unformat_error, line_input);
+      goto done;
+    }
+
+  if (p == 255)
+    vlib_cli_output (vm, "NAT64 sessions:");
+  else
+    vlib_cli_output (vm, "NAT64 %U sessions:", format_nat_protocol, proto);
+  /* *INDENT-OFF* */
+  vec_foreach (db, nm->db)
+    {
+      ctx.db = db;
+      nat64_db_st_walk (db, p, nat64_cli_st_walk, &ctx);
+    }
+  /* *INDENT-ON* */
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+static clib_error_t *
+nat64_add_del_prefix_command_fn (vlib_main_t * vm, unformat_input_t * input,
+				 vlib_cli_command_t * cmd)
+{
+  nat64_main_t *nm = &nat64_main;
+  vnet_main_t *vnm = vnet_get_main ();
+  clib_error_t *error = 0;
+  unformat_input_t _line_input, *line_input = &_line_input;
+  u8 is_add = 1;
+  u32 vrf_id = 0, sw_if_index = ~0;
+  ip6_address_t prefix;
+  u32 plen = 0;
+  int rv;
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat
+	  (line_input, "%U/%u", unformat_ip6_address, &prefix, &plen))
+	;
+      else if (unformat (line_input, "tenant-vrf %u", &vrf_id))
+	;
+      else if (unformat (line_input, "del"))
+	is_add = 0;
+      else
+	if (unformat
+	    (line_input, "interface %U", unformat_vnet_sw_interface, vnm,
+	     &sw_if_index))
+	;
+      else
+	{
+	  error = clib_error_return (0, "unknown input: '%U'",
+				     format_unformat_error, line_input);
+	  goto done;
+	}
+    }
+
+  if (!plen)
+    {
+      error = clib_error_return (0, "NAT64 prefix must be set.");
+      goto done;
+    }
+
+  rv = nat64_add_del_prefix (&prefix, (u8) plen, vrf_id, is_add);
+
+  switch (rv)
+    {
+    case VNET_API_ERROR_NO_SUCH_ENTRY:
+      error = clib_error_return (0, "NAT64 prefix not exist.");
+      goto done;
+    case VNET_API_ERROR_INVALID_VALUE:
+      error = clib_error_return (0, "Invalid prefix length.");
+      goto done;
+    default:
+      break;
+    }
+
+  /*
+   * Add RX interface route, whenNAT isn't running on the real input
+   * interface
+   */
+  if (sw_if_index != ~0)
+    {
+      u32 fib_index;
+      fib_prefix_t fibpfx = {
+	.fp_len = plen,
+	.fp_proto = FIB_PROTOCOL_IP6,
+	.fp_addr = {
+		    .ip6 = prefix}
+      };
+
+      if (is_add)
+	{
+	  fib_index =
+	    fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6,
+					       vrf_id, nm->fib_src_hi);
+	  fib_table_entry_update_one_path (fib_index, &fibpfx,
+					   nm->fib_src_hi,
+					   FIB_ENTRY_FLAG_NONE,
+					   DPO_PROTO_IP6, NULL,
+					   sw_if_index, ~0, 0,
+					   NULL, FIB_ROUTE_PATH_INTF_RX);
+	}
+      else
+	{
+	  fib_index = fib_table_find (FIB_PROTOCOL_IP6, vrf_id);
+	  fib_table_entry_path_remove (fib_index, &fibpfx,
+				       nm->fib_src_hi,
+				       DPO_PROTO_IP6, NULL,
+				       sw_if_index, ~0, 1,
+				       FIB_ROUTE_PATH_INTF_RX);
+	  fib_table_unlock (fib_index, FIB_PROTOCOL_IP6, nm->fib_src_hi);
+	}
+    }
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+static int
+nat64_cli_prefix_walk (nat64_prefix_t * p, void *ctx)
+{
+  vlib_main_t *vm = ctx;
+
+  vlib_cli_output (vm, " %U/%u tenant-vrf %u",
+		   format_ip6_address, &p->prefix, p->plen, p->vrf_id);
+
+  return 0;
+}
+
+static clib_error_t *
+nat64_show_prefix_command_fn (vlib_main_t * vm,
+			      unformat_input_t * input,
+			      vlib_cli_command_t * cmd)
+{
+  vlib_cli_output (vm, "NAT64 prefix:");
+  nat64_prefix_walk (nat64_cli_prefix_walk, vm);
+
+  return 0;
+}
+
+static clib_error_t *
+nat64_add_interface_address_command_fn (vlib_main_t * vm,
+					unformat_input_t * input,
+					vlib_cli_command_t * cmd)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  unformat_input_t _line_input, *line_input = &_line_input;
+  u32 sw_if_index;
+  int rv;
+  int is_add = 1;
+  clib_error_t *error = 0;
+
+  /* Get a line of input. */
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat
+	  (line_input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index));
+      else if (unformat (line_input, "del"))
+	is_add = 0;
+      else
+	{
+	  error = clib_error_return (0, "unknown input '%U'",
+				     format_unformat_error, line_input);
+	  goto done;
+	}
+    }
+
+  rv = nat64_add_interface_address (sw_if_index, is_add);
+
+  switch (rv)
+    {
+    case VNET_API_ERROR_NO_SUCH_ENTRY:
+      error = clib_error_return (0, "entry not exist");
+      break;
+    case VNET_API_ERROR_VALUE_EXIST:
+      error = clib_error_return (0, "entry exist");
+      break;
+    default:
+      break;
+    }
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+/* *INDENT-OFF* */
+/*?
+ * @cliexpar
+ * @cliexstart{nat64 plugin}
+ * Enable/disable NAT64 plugin.
+ * To enable NAT64 plugin use:
+ *  vpp# nat64 plugin enable
+ * To enable NAT64 plugin and configure buckets/memory:
+ *  vpp# nat64 plugin enable bib-buckets <n> bib-memory <s> \
+ *    st-buckets <n> st-memory <s>
+ * To disable NAT64 plugin:
+ *  vpp# nat64 plugin disable
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (nat64_plugin_enable_disable_command, static) =
+{
+  .path = "nat64 plugin",
+  .short_help = "nat64 plugin <enable "
+                "[bib-buckets <count>] [bib-memory <size>] "
+                "[st-buckets <count>] [st-memory <size>] | disable>",
+  .function = nat64_plugin_enable_disable_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{nat64 add pool address}
+ * Add/delete NAT64 pool address.
+ * To add single NAT64 pool address use:
+ *  vpp# nat64 add pool address 10.1.1.10
+ * To add NAT64 pool address range use:
+ *  vpp# nat64 add pool address 10.1.1.2 - 10.1.1.5
+ * To add NAT64 pool address for specific tenant use:
+ *  vpp# nat64 add pool address 10.1.1.100 tenant-vrf 100
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (nat64_add_pool_address_command, static) = {
+  .path = "nat64 add pool address",
+  .short_help = "nat64 add pool address <ip4-range-start> [- <ip4-range-end>] "
+                "[tenant-vrf <vrf-id>] [del]",
+  .function = nat64_add_del_pool_addr_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{show nat64 pool}
+ * Show NAT64 pool.
+ *  vpp# show nat64 pool
+ *  NAT64 pool:
+ *   10.1.1.3 tenant VRF: 0
+ *   10.1.1.10 tenant VRF: 10
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (show_nat64_pool_command, static) = {
+  .path = "show nat64 pool",
+  .short_help = "show nat64 pool",
+  .function = nat64_show_pool_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{set interface nat64}
+ * Enable/disable NAT64 feature on the interface.
+ * To enable NAT64 feature with local (IPv6) network interface
+ * GigabitEthernet0/8/0 and external (IPv4) network interface
+ * GigabitEthernet0/a/0 use:
+ *  vpp# set interface nat64 in GigabitEthernet0/8/0 out GigabitEthernet0/a/0
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (set_interface_nat64_command, static) = {
+  .path = "set interface nat64",
+  .short_help = "set interface nat64 in|out <intfc> [del]",
+  .function = nat64_interface_feature_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{show nat64 interfaces}
+ * Show interfaces with NAT64 feature.
+ * To show interfaces with NAT64 feature use:
+ *  vpp# show nat64 interfaces
+ *  NAT64 interfaces:
+ *   GigabitEthernet0/8/0 in
+ *   GigabitEthernet0/a/0 out
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (show_nat64_interfaces_command, static) = {
+  .path = "show nat64 interfaces",
+  .short_help = "show nat64 interfaces",
+  .function = nat64_show_interfaces_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{nat64 add static bib}
+ * Add/delete NAT64 static BIB entry.
+ * To create NAT64 satatic BIB entry use:
+ *  vpp# nat64 add static bib 2001:db8:c000:221:: 1234 10.1.1.3 5678 tcp
+ *  vpp# nat64 add static bib 2001:db8:c000:221:: 1234 10.1.1.3 5678 udp vrf 10
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (nat64_add_del_static_bib_command, static) = {
+  .path = "nat64 add static bib",
+  .short_help = "nat64 add static bib <ip6-addr> <port> <ip4-addr> <port> "
+                "tcp|udp|icmp [vfr <table-id>] [del]",
+  .function = nat64_add_del_static_bib_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{show nat64 bib}
+ * Show NAT64 BIB entries.
+ * To show NAT64 TCP BIB entries use:
+ *  vpp# show nat64 bib tcp
+ *  NAT64 tcp BIB:
+ *   fd01:1::2 6303 10.0.0.3 62303 tcp vrf 0 dynamic 1 sessions
+ *   2001:db8:c000:221:: 1234 10.1.1.3 5678 tcp vrf 0 static 2 sessions
+ * To show NAT64 UDP BIB entries use:
+ *  vpp# show nat64 bib udp
+ *  NAT64 udp BIB:
+ *   fd01:1::2 6304 10.0.0.3 10546 udp vrf 0 dynamic 10 sessions
+ *   2001:db8:c000:221:: 1234 10.1.1.3 5678 udp vrf 10 static 0 sessions
+ * To show NAT64 ICMP BIB entries use:
+ *  vpp# show nat64 bib icmp
+ *  NAT64 icmp BIB:
+ *   fd01:1::2 6305 10.0.0.3 63209 icmp vrf 10 dynamic 1 sessions
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (show_nat64_bib_command, static) = {
+  .path = "show nat64 bib",
+  .short_help = "show nat64 bib all|tcp|udp|icmp|unknown",
+  .function = nat64_show_bib_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{show nat64 session table}
+ * Show NAT64 session table.
+ * To show NAT64 TCP session table use:
+ *  vpp# show nat64 session table tcp
+ *  NAT64 tcp session table:
+ *   fd01:1::2 6303 64:ff9b::ac10:202 20 10.0.0.3 62303 172.16.2.2 20 tcp vrf 0
+ *   fd01:3::2 6303 64:ff9b::ac10:202 20 10.0.10.3 21300 172.16.2.2 20 tcp vrf 10
+ * To show NAT64 UDP session table use:
+ * #vpp show nat64 session table udp
+ * NAT64 udp session table:
+ *  fd01:1::2 6304 64:ff9b::ac10:202 20 10.0.0.3 10546 172.16.2.2 20 udp vrf 0
+ *  fd01:3::2 6304 64:ff9b::ac10:202 20 10.0.10.3 58627 172.16.2.2 20 udp vrf 10
+ *  fd01:1::2 1235 64:ff9b::a00:3 4023 10.0.0.3 24488 10.0.0.3 4023 udp vrf 0
+ *  fd01:1::3 23 64:ff9b::a00:3 24488 10.0.0.3 4023 10.0.0.3 24488 udp vrf 0
+ * To show NAT64 ICMP session table use:
+ * #vpp show nat64 session table icmp
+ * NAT64 icmp session table:
+ *  fd01:1::2 64:ff9b::ac10:202 6305 10.0.0.3 172.16.2.2 63209 icmp vrf 0
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (show_nat64_st_command, static) = {
+  .path = "show nat64 session table",
+  .short_help = "show nat64 session table all|tcp|udp|icmp|unknown",
+  .function = nat64_show_st_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{nat64 add prefix}
+ * Set NAT64 prefix for generating IPv6 representations of IPv4 addresses.
+ * To set NAT64 global prefix use:
+ *  vpp# nat64 add prefix 2001:db8::/32
+ * To set NAT64 prefix for specific tenant use:
+ *  vpp# nat64 add prefix 2001:db8:122:300::/56 tenant-vrf 10
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (nat64_add_del_prefix_command, static) = {
+  .path = "nat64 add prefix",
+  .short_help = "nat64 add prefix <ip6-prefix>/<plen> [tenant-vrf <vrf-id>] "
+                "[del] [interface <interface]",
+  .function = nat64_add_del_prefix_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{show nat64 prefix}
+ * Show NAT64 prefix.
+ * To show NAT64 prefix use:
+ *  vpp# show nat64 prefix
+ *  NAT64 prefix:
+ *   2001:db8::/32 tenant-vrf 0
+ *   2001:db8:122:300::/56 tenant-vrf 10
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (show_nat64_prefix_command, static) = {
+  .path = "show nat64 prefix",
+  .short_help = "show nat64 prefix",
+  .function = nat64_show_prefix_command_fn,
+};
+
+/*?
+ * @cliexpar
+ * @cliexstart{nat64 add interface address}
+ * Add/delete NAT64 pool address from specific (DHCP addressed) interface.
+ * To add NAT64 pool address from specific interface use:
+ *  vpp# nat64 add interface address GigabitEthernet0/8/0
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (nat64_add_interface_address_command, static) = {
+    .path = "nat64 add interface address",
+    .short_help = "nat64 add interface address <interface> [del]",
+    .function = nat64_add_interface_address_command_fn,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/nat/nat64/nat64_db.c b/src/plugins/nat/nat64/nat64_db.c
new file mode 100644
index 00000000000..ffc5e7e7e84
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64_db.c
@@ -0,0 +1,742 @@
+/*
+ * Copyright (c) 2020 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 <vnet/fib/fib_table.h>
+//#include <nat/nat_ipfix_logging.h>
+#include <nat/nat_syslog.h>
+#include <nat/lib/inlines.h>
+#include <nat/nat64/nat64_db.h>
+
+int
+nat64_db_init (nat64_db_t * db, nat64_config_t c,
+	       nat64_db_free_addr_port_function_t free_addr_port_cb)
+{
+  clib_bihash_init_24_8 (&db->bib.in2out, "bib-in2out", c.bib_buckets,
+			 c.bib_memory_size);
+
+  clib_bihash_init_24_8 (&db->bib.out2in, "bib-out2in", c.bib_buckets,
+			 c.bib_memory_size);
+
+  clib_bihash_init_48_8 (&db->st.in2out, "st-in2out", c.st_buckets,
+			 c.st_memory_size);
+
+  clib_bihash_init_48_8 (&db->st.out2in, "st-out2in", c.st_buckets,
+			 c.st_memory_size);
+
+  db->free_addr_port_cb = free_addr_port_cb;
+  db->bib.limit = 10 * c.bib_buckets;
+  db->bib.bib_entries_num = 0;
+  db->st.limit = 10 * c.st_buckets;
+  db->st.st_entries_num = 0;
+  db->addr_free = 0;
+
+  return 0;
+}
+
+int
+nat64_db_free (nat64_db_t * db)
+{
+  clib_bihash_free_24_8 (&db->bib.in2out);
+  clib_bihash_free_24_8 (&db->bib.out2in);
+
+  clib_bihash_free_48_8 (&db->st.in2out);
+  clib_bihash_free_48_8 (&db->st.out2in);
+
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+  pool_free (db->bib._##n##_bib); \
+  pool_free (db->st._##n##_st);
+  foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+
+  pool_free (db->bib._unk_proto_bib);
+  pool_free (db->st._unk_proto_st);
+
+  return 0;
+}
+
+nat64_db_bib_entry_t *
+nat64_db_bib_entry_create (u32 thread_index, nat64_db_t * db,
+			   ip6_address_t * in_addr,
+			   ip4_address_t * out_addr, u16 in_port,
+			   u16 out_port, u32 fib_index, u8 proto,
+			   u8 is_static)
+{
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_bib_entry_key_t bibe_key;
+  clib_bihash_kv_24_8_t kv;
+
+  if (db->bib.bib_entries_num >= db->bib.limit)
+    {
+      db->free_addr_port_cb (db, out_addr, out_port, proto);
+      //nat_ipfix_logging_max_bibs (thread_index, db->bib.limit);
+      return 0;
+    }
+
+  /* create pool entry */
+  switch (ip_proto_to_nat_proto (proto))
+    {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+    case NAT_PROTOCOL_##N: \
+      pool_get (db->bib._##n##_bib, bibe); \
+      kv.value = bibe - db->bib._##n##_bib; \
+      break;
+      foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+    default:
+      pool_get (db->bib._unk_proto_bib, bibe);
+      kv.value = bibe - db->bib._unk_proto_bib;
+      break;
+    }
+
+  db->bib.bib_entries_num++;
+
+  clib_memset (bibe, 0, sizeof (*bibe));
+  bibe->in_addr.as_u64[0] = in_addr->as_u64[0];
+  bibe->in_addr.as_u64[1] = in_addr->as_u64[1];
+  bibe->in_port = in_port;
+  bibe->out_addr.as_u32 = out_addr->as_u32;
+  bibe->out_port = out_port;
+  bibe->fib_index = fib_index;
+  bibe->proto = proto;
+  bibe->is_static = is_static;
+
+  /* create hash lookup */
+  bibe_key.addr.as_u64[0] = bibe->in_addr.as_u64[0];
+  bibe_key.addr.as_u64[1] = bibe->in_addr.as_u64[1];
+  bibe_key.fib_index = bibe->fib_index;
+  bibe_key.port = bibe->in_port;
+  bibe_key.proto = bibe->proto;
+  bibe_key.rsvd = 0;
+  kv.key[0] = bibe_key.as_u64[0];
+  kv.key[1] = bibe_key.as_u64[1];
+  kv.key[2] = bibe_key.as_u64[2];
+  clib_bihash_add_del_24_8 (&db->bib.in2out, &kv, 1);
+
+  clib_memset (&bibe_key.addr, 0, sizeof (bibe_key.addr));
+  bibe_key.addr.ip4.as_u32 = bibe->out_addr.as_u32;
+  bibe_key.fib_index = 0;
+  bibe_key.port = bibe->out_port;
+  kv.key[0] = bibe_key.as_u64[0];
+  kv.key[1] = bibe_key.as_u64[1];
+  kv.key[2] = bibe_key.as_u64[2];
+  clib_bihash_add_del_24_8 (&db->bib.out2in, &kv, 1);
+
+  /*fib_table_t *fib = fib_table_get (bibe->fib_index, FIB_PROTOCOL_IP6);
+     nat_ipfix_logging_nat64_bib (thread_index, in_addr, out_addr, proto,
+     in_port, out_port, fib->ft_table_id, 1); */
+  return bibe;
+}
+
+void
+nat64_db_bib_entry_free (u32 thread_index, nat64_db_t * db,
+			 nat64_db_bib_entry_t * bibe)
+{
+  nat64_db_bib_entry_key_t bibe_key;
+  clib_bihash_kv_24_8_t kv;
+  nat64_db_bib_entry_t *bib;
+  u32 *ste_to_be_free = 0, *ste_index, bibe_index;
+  nat64_db_st_entry_t *st, *ste;
+
+  switch (ip_proto_to_nat_proto (bibe->proto))
+    {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+    case NAT_PROTOCOL_##N: \
+      bib = db->bib._##n##_bib; \
+      st = db->st._##n##_st; \
+      break;
+      foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+    default:
+      bib = db->bib._unk_proto_bib;
+      st = db->st._unk_proto_st;
+      break;
+    }
+
+  db->bib.bib_entries_num--;
+
+  bibe_index = bibe - bib;
+
+  /* delete ST entries for static BIB entry */
+  if (bibe->is_static)
+    {
+      pool_foreach (ste, st, (
+			       {
+			       if (ste->bibe_index == bibe_index)
+			       vec_add1 (ste_to_be_free, ste - st);}
+		    ));
+      vec_foreach (ste_index, ste_to_be_free)
+	nat64_db_st_entry_free (thread_index, db,
+				pool_elt_at_index (st, ste_index[0]));
+      vec_free (ste_to_be_free);
+    }
+
+  /* delete hash lookup */
+  bibe_key.addr.as_u64[0] = bibe->in_addr.as_u64[0];
+  bibe_key.addr.as_u64[1] = bibe->in_addr.as_u64[1];
+  bibe_key.fib_index = bibe->fib_index;
+  bibe_key.port = bibe->in_port;
+  bibe_key.proto = bibe->proto;
+  bibe_key.rsvd = 0;
+  kv.key[0] = bibe_key.as_u64[0];
+  kv.key[1] = bibe_key.as_u64[1];
+  kv.key[2] = bibe_key.as_u64[2];
+  clib_bihash_add_del_24_8 (&db->bib.in2out, &kv, 0);
+
+  clib_memset (&bibe_key.addr, 0, sizeof (bibe_key.addr));
+  bibe_key.addr.ip4.as_u32 = bibe->out_addr.as_u32;
+  bibe_key.fib_index = 0;
+  bibe_key.port = bibe->out_port;
+  kv.key[0] = bibe_key.as_u64[0];
+  kv.key[1] = bibe_key.as_u64[1];
+  kv.key[2] = bibe_key.as_u64[2];
+  clib_bihash_add_del_24_8 (&db->bib.out2in, &kv, 0);
+
+  if (!db->addr_free)
+    db->free_addr_port_cb (db, &bibe->out_addr, bibe->out_port, bibe->proto);
+
+  /*fib_table_t *fib = fib_table_get (bibe->fib_index, FIB_PROTOCOL_IP6);
+     nat_ipfix_logging_nat64_bib (thread_index, &bibe->in_addr, &bibe->out_addr,
+     bibe->proto, bibe->in_port, bibe->out_port,
+     fib->ft_table_id, 0); */
+
+  /* delete from pool */
+  pool_put (bib, bibe);
+}
+
+nat64_db_bib_entry_t *
+nat64_db_bib_entry_find (nat64_db_t * db, ip46_address_t * addr, u16 port,
+			 u8 proto, u32 fib_index, u8 is_ip6)
+{
+  nat64_db_bib_entry_t *bibe = 0;
+  nat64_db_bib_entry_key_t bibe_key;
+  clib_bihash_kv_24_8_t kv, value;
+  nat64_db_bib_entry_t *bib;
+
+  switch (ip_proto_to_nat_proto (proto))
+    {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+    case NAT_PROTOCOL_##N: \
+      bib = db->bib._##n##_bib; \
+      break;
+      foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+    default:
+      bib = db->bib._unk_proto_bib;
+      break;
+    }
+
+  bibe_key.addr.as_u64[0] = addr->as_u64[0];
+  bibe_key.addr.as_u64[1] = addr->as_u64[1];
+  bibe_key.fib_index = fib_index;
+  bibe_key.port = port;
+  bibe_key.proto = proto;
+  bibe_key.rsvd = 0;
+
+  kv.key[0] = bibe_key.as_u64[0];
+  kv.key[1] = bibe_key.as_u64[1];
+  kv.key[2] = bibe_key.as_u64[2];
+
+  if (!clib_bihash_search_24_8
+      (is_ip6 ? &db->bib.in2out : &db->bib.out2in, &kv, &value))
+    bibe = pool_elt_at_index (bib, value.value);
+
+  return bibe;
+}
+
+void
+nat64_db_bib_walk (nat64_db_t * db, u8 proto,
+		   nat64_db_bib_walk_fn_t fn, void *ctx)
+{
+  nat64_db_bib_entry_t *bib, *bibe;
+
+  if (proto == 255)
+    {
+    /* *INDENT-OFF* */
+    #define _(N, i, n, s) \
+      bib = db->bib._##n##_bib; \
+      pool_foreach (bibe, bib, ({ \
+        if (fn (bibe, ctx)) \
+          return; \
+      }));
+      foreach_nat_protocol
+    #undef _
+      bib = db->bib._unk_proto_bib;
+      pool_foreach (bibe, bib, ({
+        if (fn (bibe, ctx))
+          return;
+      }));
+    /* *INDENT-ON* */
+    }
+  else
+    {
+      switch (ip_proto_to_nat_proto (proto))
+	{
+    /* *INDENT-OFF* */
+    #define _(N, i, n, s) \
+        case NAT_PROTOCOL_##N: \
+          bib = db->bib._##n##_bib; \
+          break;
+          foreach_nat_protocol
+    #undef _
+    /* *INDENT-ON* */
+	default:
+	  bib = db->bib._unk_proto_bib;
+	  break;
+	}
+
+      /* *INDENT-OFF* */
+      pool_foreach (bibe, bib,
+      ({
+        if (fn (bibe, ctx))
+          return;
+      }));
+      /* *INDENT-ON* */
+    }
+}
+
+nat64_db_bib_entry_t *
+nat64_db_bib_entry_by_index (nat64_db_t * db, u8 proto, u32 bibe_index)
+{
+  nat64_db_bib_entry_t *bib;
+
+  switch (ip_proto_to_nat_proto (proto))
+    {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+    case NAT_PROTOCOL_##N: \
+      bib = db->bib._##n##_bib; \
+      break;
+      foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+    default:
+      bib = db->bib._unk_proto_bib;
+      break;
+    }
+
+  return pool_elt_at_index (bib, bibe_index);
+}
+
+void
+nat64_db_st_walk (nat64_db_t * db, u8 proto,
+		  nat64_db_st_walk_fn_t fn, void *ctx)
+{
+  nat64_db_st_entry_t *st, *ste;
+
+  if (proto == 255)
+    {
+    /* *INDENT-OFF* */
+    #define _(N, i, n, s) \
+      st = db->st._##n##_st; \
+      pool_foreach (ste, st, ({ \
+        if (fn (ste, ctx)) \
+          return; \
+      }));
+      foreach_nat_protocol
+    #undef _
+      st = db->st._unk_proto_st;
+      pool_foreach (ste, st, ({
+        if (fn (ste, ctx))
+          return;
+      }));
+    /* *INDENT-ON* */
+    }
+  else
+    {
+      switch (ip_proto_to_nat_proto (proto))
+	{
+    /* *INDENT-OFF* */
+    #define _(N, i, n, s) \
+        case NAT_PROTOCOL_##N: \
+          st = db->st._##n##_st; \
+          break;
+          foreach_nat_protocol
+    #undef _
+    /* *INDENT-ON* */
+	default:
+	  st = db->st._unk_proto_st;
+	  break;
+	}
+
+      /* *INDENT-OFF* */
+      pool_foreach (ste, st,
+      ({
+        if (fn (ste, ctx))
+          return;
+      }));
+      /* *INDENT-ON* */
+    }
+}
+
+nat64_db_st_entry_t *
+nat64_db_st_entry_create (u32 thread_index, nat64_db_t * db,
+			  nat64_db_bib_entry_t * bibe,
+			  ip6_address_t * in_r_addr,
+			  ip4_address_t * out_r_addr, u16 r_port)
+{
+  nat64_db_st_entry_t *ste;
+  nat64_db_bib_entry_t *bib;
+  nat64_db_st_entry_key_t ste_key;
+  clib_bihash_kv_48_8_t kv;
+
+  if (db->st.st_entries_num >= db->st.limit)
+    {
+      //nat_ipfix_logging_max_sessions (thread_index, db->st.limit);
+      return 0;
+    }
+
+  /* create pool entry */
+  switch (ip_proto_to_nat_proto (bibe->proto))
+    {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+    case NAT_PROTOCOL_##N: \
+      pool_get (db->st._##n##_st, ste); \
+      kv.value = ste - db->st._##n##_st; \
+      bib = db->bib._##n##_bib; \
+      break;
+      foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+    default:
+      pool_get (db->st._unk_proto_st, ste);
+      kv.value = ste - db->st._unk_proto_st;
+      bib = db->bib._unk_proto_bib;
+      break;
+    }
+
+  db->st.st_entries_num++;
+
+  clib_memset (ste, 0, sizeof (*ste));
+  ste->in_r_addr.as_u64[0] = in_r_addr->as_u64[0];
+  ste->in_r_addr.as_u64[1] = in_r_addr->as_u64[1];
+  ste->out_r_addr.as_u32 = out_r_addr->as_u32;
+  ste->r_port = r_port;
+  ste->bibe_index = bibe - bib;
+  ste->proto = bibe->proto;
+
+  /* increment session number for BIB entry */
+  bibe->ses_num++;
+
+  /* create hash lookup */
+  clib_memset (&ste_key, 0, sizeof (ste_key));
+  ste_key.l_addr.as_u64[0] = bibe->in_addr.as_u64[0];
+  ste_key.l_addr.as_u64[1] = bibe->in_addr.as_u64[1];
+  ste_key.r_addr.as_u64[0] = ste->in_r_addr.as_u64[0];
+  ste_key.r_addr.as_u64[1] = ste->in_r_addr.as_u64[1];
+  ste_key.fib_index = bibe->fib_index;
+  ste_key.l_port = bibe->in_port;
+  ste_key.r_port = ste->r_port;
+  ste_key.proto = ste->proto;
+  kv.key[0] = ste_key.as_u64[0];
+  kv.key[1] = ste_key.as_u64[1];
+  kv.key[2] = ste_key.as_u64[2];
+  kv.key[3] = ste_key.as_u64[3];
+  kv.key[4] = ste_key.as_u64[4];
+  kv.key[5] = ste_key.as_u64[5];
+  clib_bihash_add_del_48_8 (&db->st.in2out, &kv, 1);
+
+  clib_memset (&ste_key, 0, sizeof (ste_key));
+  ste_key.l_addr.ip4.as_u32 = bibe->out_addr.as_u32;
+  ste_key.r_addr.ip4.as_u32 = ste->out_r_addr.as_u32;
+  ste_key.l_port = bibe->out_port;
+  ste_key.r_port = ste->r_port;
+  ste_key.proto = ste->proto;
+  kv.key[0] = ste_key.as_u64[0];
+  kv.key[1] = ste_key.as_u64[1];
+  kv.key[2] = ste_key.as_u64[2];
+  kv.key[3] = ste_key.as_u64[3];
+  kv.key[4] = ste_key.as_u64[4];
+  kv.key[5] = ste_key.as_u64[5];
+  clib_bihash_add_del_48_8 (&db->st.out2in, &kv, 1);
+
+  /*fib_table_t *fib = fib_table_get (bibe->fib_index, FIB_PROTOCOL_IP6);
+     nat_ipfix_logging_nat64_session (thread_index, &bibe->in_addr,
+     &bibe->out_addr, bibe->proto,
+     bibe->in_port, bibe->out_port,
+     &ste->in_r_addr, &ste->out_r_addr,
+     ste->r_port, ste->r_port, fib->ft_table_id,
+     1); */
+  nat_syslog_nat64_sadd (bibe->fib_index, &bibe->in_addr, bibe->in_port,
+			 &bibe->out_addr, bibe->out_port, &ste->out_r_addr,
+			 ste->r_port, bibe->proto);
+  return ste;
+}
+
+void
+nat64_db_st_entry_free (u32 thread_index,
+			nat64_db_t * db, nat64_db_st_entry_t * ste)
+{
+  nat64_db_st_entry_t *st;
+  nat64_db_bib_entry_t *bib, *bibe;
+  nat64_db_st_entry_key_t ste_key;
+  clib_bihash_kv_48_8_t kv;
+
+  switch (ip_proto_to_nat_proto (ste->proto))
+    {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+    case NAT_PROTOCOL_##N: \
+      st = db->st._##n##_st; \
+      bib = db->bib._##n##_bib; \
+      break;
+      foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+    default:
+      st = db->st._unk_proto_st;
+      bib = db->bib._unk_proto_bib;
+      break;
+    }
+
+  bibe = pool_elt_at_index (bib, ste->bibe_index);
+
+  db->st.st_entries_num--;
+
+  /* delete hash lookup */
+  clib_memset (&ste_key, 0, sizeof (ste_key));
+  ste_key.l_addr.as_u64[0] = bibe->in_addr.as_u64[0];
+  ste_key.l_addr.as_u64[1] = bibe->in_addr.as_u64[1];
+  ste_key.r_addr.as_u64[0] = ste->in_r_addr.as_u64[0];
+  ste_key.r_addr.as_u64[1] = ste->in_r_addr.as_u64[1];
+  ste_key.fib_index = bibe->fib_index;
+  ste_key.l_port = bibe->in_port;
+  ste_key.r_port = ste->r_port;
+  ste_key.proto = ste->proto;
+  kv.key[0] = ste_key.as_u64[0];
+  kv.key[1] = ste_key.as_u64[1];
+  kv.key[2] = ste_key.as_u64[2];
+  kv.key[3] = ste_key.as_u64[3];
+  kv.key[4] = ste_key.as_u64[4];
+  kv.key[5] = ste_key.as_u64[5];
+  clib_bihash_add_del_48_8 (&db->st.in2out, &kv, 0);
+
+  clib_memset (&ste_key, 0, sizeof (ste_key));
+  ste_key.l_addr.ip4.as_u32 = bibe->out_addr.as_u32;
+  ste_key.r_addr.ip4.as_u32 = ste->out_r_addr.as_u32;
+  ste_key.l_port = bibe->out_port;
+  ste_key.r_port = ste->r_port;
+  ste_key.proto = ste->proto;
+  kv.key[0] = ste_key.as_u64[0];
+  kv.key[1] = ste_key.as_u64[1];
+  kv.key[2] = ste_key.as_u64[2];
+  kv.key[3] = ste_key.as_u64[3];
+  kv.key[4] = ste_key.as_u64[4];
+  kv.key[5] = ste_key.as_u64[5];
+  clib_bihash_add_del_48_8 (&db->st.out2in, &kv, 0);
+
+  /*fib_table_t *fib = fib_table_get (bibe->fib_index, FIB_PROTOCOL_IP6);
+     nat_ipfix_logging_nat64_session (thread_index, &bibe->in_addr,
+     &bibe->out_addr, bibe->proto,
+     bibe->in_port, bibe->out_port,
+     &ste->in_r_addr, &ste->out_r_addr,
+     ste->r_port, ste->r_port, fib->ft_table_id,
+     0); */
+  nat_syslog_nat64_sdel (bibe->fib_index, &bibe->in_addr, bibe->in_port,
+			 &bibe->out_addr, bibe->out_port, &ste->out_r_addr,
+			 ste->r_port, bibe->proto);
+
+  /* delete from pool */
+  pool_put (st, ste);
+
+  /* decrement session number for BIB entry */
+  bibe->ses_num--;
+
+  /* delete BIB entry if last session and dynamic */
+  if (!bibe->is_static && !bibe->ses_num)
+    nat64_db_bib_entry_free (thread_index, db, bibe);
+}
+
+nat64_db_st_entry_t *
+nat64_db_st_entry_find (nat64_db_t * db, ip46_address_t * l_addr,
+			ip46_address_t * r_addr, u16 l_port, u16 r_port,
+			u8 proto, u32 fib_index, u8 is_ip6)
+{
+  nat64_db_st_entry_t *ste = 0;
+  nat64_db_st_entry_t *st;
+  nat64_db_st_entry_key_t ste_key;
+  clib_bihash_kv_48_8_t kv, value;
+
+  switch (ip_proto_to_nat_proto (proto))
+    {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+    case NAT_PROTOCOL_##N: \
+      st = db->st._##n##_st; \
+      break;
+      foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+    default:
+      st = db->st._unk_proto_st;
+      break;
+    }
+
+  clib_memset (&ste_key, 0, sizeof (ste_key));
+  ste_key.l_addr.as_u64[0] = l_addr->as_u64[0];
+  ste_key.l_addr.as_u64[1] = l_addr->as_u64[1];
+  ste_key.r_addr.as_u64[0] = r_addr->as_u64[0];
+  ste_key.r_addr.as_u64[1] = r_addr->as_u64[1];
+  ste_key.fib_index = fib_index;
+  ste_key.l_port = l_port;
+  ste_key.r_port = r_port;
+  ste_key.proto = proto;
+  kv.key[0] = ste_key.as_u64[0];
+  kv.key[1] = ste_key.as_u64[1];
+  kv.key[2] = ste_key.as_u64[2];
+  kv.key[3] = ste_key.as_u64[3];
+  kv.key[4] = ste_key.as_u64[4];
+  kv.key[5] = ste_key.as_u64[5];
+
+  if (!clib_bihash_search_48_8
+      (is_ip6 ? &db->st.in2out : &db->st.out2in, &kv, &value))
+    ste = pool_elt_at_index (st, value.value);
+
+  return ste;
+}
+
+u32
+nat64_db_st_entry_get_index (nat64_db_t * db, nat64_db_st_entry_t * ste)
+{
+  nat64_db_st_entry_t *st;
+
+  switch (ip_proto_to_nat_proto (ste->proto))
+    {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+    case NAT_PROTOCOL_##N: \
+      st = db->st._##n##_st; \
+      break;
+      foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+    default:
+      st = db->st._unk_proto_st;
+      return (u32) ~ 0;
+    }
+
+  return ste - st;
+}
+
+nat64_db_st_entry_t *
+nat64_db_st_entry_by_index (nat64_db_t * db, u8 proto, u32 ste_index)
+{
+  nat64_db_st_entry_t *st;
+
+  switch (ip_proto_to_nat_proto (proto))
+    {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+    case NAT_PROTOCOL_##N: \
+      st = db->st._##n##_st; \
+      break;
+      foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+    default:
+      st = db->st._unk_proto_st;
+      break;
+    }
+
+  return pool_elt_at_index (st, ste_index);
+}
+
+void
+nad64_db_st_free_expired (u32 thread_index, nat64_db_t * db, u32 now)
+{
+  u32 *ste_to_be_free = 0, *ste_index;
+  nat64_db_st_entry_t *st, *ste;
+
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+  st = db->st._##n##_st; \
+  pool_foreach (ste, st, ({\
+    if (i == NAT_PROTOCOL_TCP && !ste->tcp_state) \
+      continue; \
+    if (ste->expire < now) \
+      vec_add1 (ste_to_be_free, ste - st); \
+  })); \
+  vec_foreach (ste_index, ste_to_be_free) \
+    nat64_db_st_entry_free (thread_index, db, \
+                            pool_elt_at_index(st, ste_index[0])); \
+  vec_free (ste_to_be_free); \
+  ste_to_be_free = 0;
+  foreach_nat_protocol
+#undef _
+  st = db->st._unk_proto_st;
+  pool_foreach (ste, st, ({
+    if (ste->expire < now)
+      vec_add1 (ste_to_be_free, ste - st);
+  }));
+  vec_foreach (ste_index, ste_to_be_free)
+    nat64_db_st_entry_free (thread_index, db,
+                            pool_elt_at_index(st, ste_index[0]));
+  vec_free (ste_to_be_free);
+/* *INDENT-ON* */
+}
+
+void
+nat64_db_free_out_addr (u32 thread_index,
+			nat64_db_t * db, ip4_address_t * out_addr)
+{
+  u32 *ste_to_be_free = 0, *ste_index;
+  nat64_db_st_entry_t *st, *ste;
+  nat64_db_bib_entry_t *bibe;
+
+  db->addr_free = 1;
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+  st = db->st._##n##_st; \
+  pool_foreach (ste, st, ({ \
+    bibe = pool_elt_at_index (db->bib._##n##_bib, ste->bibe_index); \
+    if (bibe->out_addr.as_u32 == out_addr->as_u32) \
+      vec_add1 (ste_to_be_free, ste - st); \
+  })); \
+  vec_foreach (ste_index, ste_to_be_free) \
+    nat64_db_st_entry_free (thread_index, db, \
+                            pool_elt_at_index(st, ste_index[0])); \
+  vec_free (ste_to_be_free); \
+  ste_to_be_free = 0;
+  foreach_nat_protocol
+#undef _
+  st = db->st._unk_proto_st;
+  pool_foreach (ste, st, ({
+    bibe = pool_elt_at_index (db->bib._unk_proto_bib, ste->bibe_index);
+    if (bibe->out_addr.as_u32 == out_addr->as_u32)
+      vec_add1 (ste_to_be_free, ste - st);
+  }));
+  vec_foreach (ste_index, ste_to_be_free)
+    nat64_db_st_entry_free (thread_index, db,
+                            pool_elt_at_index(st, ste_index[0]));
+  vec_free (ste_to_be_free);
+  db->addr_free = 0;
+/* *INDENT-ON* */
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/nat/nat64/nat64_db.h b/src/plugins/nat/nat64/nat64_db.h
new file mode 100644
index 00000000000..711b6bf6b03
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64_db.h
@@ -0,0 +1,380 @@
+/*
+ * Copyright (c) 2020 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.
+ */
+#ifndef __included_nat64_db_h__
+#define __included_nat64_db_h__
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/fib/fib_source.h>
+
+#include <vppinfra/bihash_24_8.h>
+#include <vppinfra/bihash_48_8.h>
+
+typedef struct
+{
+  u32 bib_buckets;
+  u32 bib_memory_size;
+  u32 st_buckets;
+  u32 st_memory_size;
+} nat64_config_t;
+
+typedef struct
+{
+  union
+  {
+    struct
+    {
+      ip46_address_t addr;
+      u32 fib_index;
+      u16 port;
+      u8 proto;
+      u8 rsvd;
+    };
+    u64 as_u64[3];
+  };
+} nat64_db_bib_entry_key_t;
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED(struct
+{
+  ip6_address_t in_addr;
+  u16 in_port;
+  ip4_address_t out_addr;
+  u16 out_port;
+  u32 fib_index;
+  u32 ses_num;
+  u8 proto;
+  u8 is_static;
+}) nat64_db_bib_entry_t;
+/* *INDENT-ON* */
+
+typedef struct
+{
+  /* BIBs */
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+  nat64_db_bib_entry_t *_##n##_bib;
+  foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+  nat64_db_bib_entry_t *_unk_proto_bib;
+
+  /* BIB lookup */
+  clib_bihash_24_8_t in2out;
+  clib_bihash_24_8_t out2in;
+
+  u32 limit;
+  u32 bib_entries_num;
+} nat64_db_bib_t;
+
+typedef struct
+{
+  union
+  {
+    struct
+    {
+      ip46_address_t l_addr;
+      ip46_address_t r_addr;
+      u32 fib_index;
+      u16 l_port;
+      u16 r_port;
+      u8 proto;
+      u8 rsvd[7];
+    };
+    u64 as_u64[6];
+  };
+} nat64_db_st_entry_key_t;
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED(struct
+{
+  ip6_address_t in_r_addr;
+  ip4_address_t out_r_addr;
+  u16 r_port;
+  u32 bibe_index;
+  u32 expire;
+  u8 proto;
+  u8 tcp_state;
+}) nat64_db_st_entry_t;
+/* *INDENT-ON* */
+
+typedef struct
+{
+  /* session tables */
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+  nat64_db_st_entry_t *_##n##_st;
+  foreach_nat_protocol
+#undef _
+/* *INDENT-ON* */
+  nat64_db_st_entry_t *_unk_proto_st;
+
+  /* session lookup */
+  clib_bihash_48_8_t in2out;
+  clib_bihash_48_8_t out2in;
+
+  u32 limit;
+  u32 st_entries_num;
+} nat64_db_st_t;
+
+struct nat64_db_s;
+
+/**
+ * @brief Call back function to free NAT64 pool address and port when BIB
+ * entry is deleted.
+ */
+typedef void (*nat64_db_free_addr_port_function_t) (struct nat64_db_s * db,
+						    ip4_address_t * addr,
+						    u16 port, u8 proto);
+
+typedef struct nat64_db_s
+{
+  nat64_db_bib_t bib;
+  nat64_db_st_t st;
+  nat64_db_free_addr_port_function_t free_addr_port_cb;
+  u8 addr_free;
+} nat64_db_t;
+
+/**
+ * @brief Initialize NAT64 DB.
+ *
+ * @param db NAT64 DB.
+ * @param c.bib_buckets Number of BIB hash buckets.
+ * @param c.bib_memory_size Memory size of BIB hash.
+ * @param c.st_buckets Number of session table hash buckets.
+ * @param c.st_memory_size Memory size of session table hash.
+ * @param free_addr_port_cb Call back function to free address and port.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_db_init (nat64_db_t * db, nat64_config_t c,
+		   nat64_db_free_addr_port_function_t free_addr_port_cb);
+
+/**
+ * @brief Free NAT64 DB.
+ *
+ * @param db NAT64 DB.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat64_db_free (nat64_db_t * db);
+
+
+/**
+ * @brief Create new NAT64 BIB entry.
+ *
+ * @param thread_index thread index.
+ * @param db NAT64 DB.
+ * @param in_addr Inside IPv6 address.
+ * @param out_addr Outside IPv4 address.
+ * @param in_port Inside port number.
+ * @param out_port Outside port number.
+ * @param fib_index FIB index.
+ * @param proto L4 protocol.
+ * @param is_static 1 if static, 0 if dynamic.
+ *
+ * @returns BIB entry on success, 0 otherwise.
+ */
+nat64_db_bib_entry_t *nat64_db_bib_entry_create (u32 thread_index,
+						 nat64_db_t * db,
+						 ip6_address_t * in_addr,
+						 ip4_address_t * out_addr,
+						 u16 in_port, u16 out_port,
+						 u32 fib_index, u8 proto,
+						 u8 is_static);
+
+/**
+ * @brief Free NAT64 BIB entry.
+ *
+ * @param thread_index thread index.
+ * @param db NAT64 DB.
+ * @param bibe BIB entry.
+ */
+void nat64_db_bib_entry_free (u32 thread_index, nat64_db_t * db,
+			      nat64_db_bib_entry_t * bibe);
+
+/**
+ * @brief Call back function when walking NAT64 BIB, non-zero
+ * return value stop walk.
+ */
+typedef int (*nat64_db_bib_walk_fn_t) (nat64_db_bib_entry_t * bibe,
+				       void *ctx);
+/**
+ * @brief Walk NAT64 BIB.
+ *
+ * @param db NAT64 DB.
+ * @param proto BIB L4 protocol:
+ *  - 255 all BIBs
+ *  - 6 TCP BIB
+ *  - 17 UDP BIB
+ *  - 1/58 ICMP BIB
+ *
+ * u - otherwise "unknown" protocol BIB
+ * @param fn The function to invoke on each entry visited.
+ * @param ctx A context passed in the visit function.
+ */
+void nat64_db_bib_walk (nat64_db_t * db, u8 proto,
+			nat64_db_bib_walk_fn_t fn, void *ctx);
+
+/**
+ * @brief Find NAT64 BIB entry.
+ *
+ * @param db NAT64 DB.
+ * @param addr IP address.
+ * @param port Port number.
+ * @param proto L4 protocol.
+ * @param fib_index FIB index.
+ * @param is_ip6 1 if find by IPv6 (inside) address, 0 by IPv4 (outside).
+ *
+ * @return BIB entry if found.
+ */
+nat64_db_bib_entry_t *nat64_db_bib_entry_find (nat64_db_t * db,
+					       ip46_address_t * addr,
+					       u16 port,
+					       u8 proto,
+					       u32 fib_index, u8 is_ip6);
+
+/**
+ * @brief Get BIB entry by index and protocol.
+ *
+ * @param db NAT64 DB.
+ * @param proto L4 protocol.
+ * @param bibe_index BIB entry index.
+ *
+ * @return BIB entry if found.
+ */
+nat64_db_bib_entry_t *nat64_db_bib_entry_by_index (nat64_db_t * db,
+						   u8 proto, u32 bibe_index);
+/**
+ * @brief Create new NAT64 session table entry.
+ *
+ * @param thread_index thread index.
+ * @param db NAT64 DB.
+ * @param bibe Corresponding BIB entry.
+ * @param in_r_addr Inside IPv6 address of the remote host.
+ * @param out_r_addr Outside IPv4 address of the remote host.
+ * @param r_port Remote host port number.
+ *
+ * @returns BIB entry on success, 0 otherwise.
+ */
+nat64_db_st_entry_t *nat64_db_st_entry_create (u32 thread_index,
+					       nat64_db_t * db,
+					       nat64_db_bib_entry_t * bibe,
+					       ip6_address_t * in_r_addr,
+					       ip4_address_t * out_r_addr,
+					       u16 r_port);
+
+/**
+ * @brief Free NAT64 session table entry.
+ *
+ * @param thread_index thread index.
+ * @param db NAT64 DB.
+ * @param ste Session table entry.
+ */
+void nat64_db_st_entry_free (u32 thread_index, nat64_db_t * db,
+			     nat64_db_st_entry_t * ste);
+
+/**
+ * @brief Find NAT64 session table entry.
+ *
+ * @param db NAT64 DB.
+ * @param l_addr Local host address.
+ * @param r_addr Remote host address.
+ * @param l_port Local host port number.
+ * @param r_port Remote host port number.
+ * @param proto L4 protocol.
+ * @param fib_index FIB index.
+ * @param is_ip6 1 if find by IPv6 (inside) address, 0 by IPv4 (outside).
+ *
+ * @return BIB entry if found.
+ */
+nat64_db_st_entry_t *nat64_db_st_entry_find (nat64_db_t * db,
+					     ip46_address_t * l_addr,
+					     ip46_address_t * r_addr,
+					     u16 l_port, u16 r_port,
+					     u8 proto,
+					     u32 fib_index, u8 is_ip6);
+
+/**
+ * @brief Call back function when walking NAT64 session table, non-zero
+ * return value stop walk.
+ */
+typedef int (*nat64_db_st_walk_fn_t) (nat64_db_st_entry_t * ste, void *ctx);
+
+/**
+ * @brief Walk NAT64 session table.
+ *
+ * @param db NAT64 DB.
+ * @param proto L4 protocol:
+ *  - 255 all session tables
+ *  - 6 TCP session table
+ *  - 17 UDP session table
+ *  - 1/58 ICMP session table
+ *  - otherwise "unknown" protocol session table
+ * @param fn The function to invoke on each entry visited.
+ * @param ctx A context passed in the visit function.
+ */
+void nat64_db_st_walk (nat64_db_t * db, u8 proto,
+		       nat64_db_st_walk_fn_t fn, void *ctx);
+
+/**
+ * @brief Free expired session entries in session tables.
+ *
+ * @param thread_index thread index.
+ * @param db NAT64 DB.
+ * @param now Current time.
+ */
+void nad64_db_st_free_expired (u32 thread_index, nat64_db_t * db, u32 now);
+
+/**
+ * @brief Free sessions using specific outside address.
+ *
+ * @param thread_index thread index.
+ * @param db NAT64 DB.
+ * @param out_addr Outside address to match.
+ */
+void nat64_db_free_out_addr (u32 thread_index, nat64_db_t * db,
+			     ip4_address_t * out_addr);
+
+/*
+ * @brief Get ST entry index.
+ *
+ * @param db NAT64 DB.
+ * @param ste ST entry.
+ *
+ * @return ST entry index on success, ~0 otherwise.
+ */
+u32 nat64_db_st_entry_get_index (nat64_db_t * db, nat64_db_st_entry_t * ste);
+
+/**
+ * @brief Get ST entry by index and protocol.
+ *
+ * @param db NAT64 DB.
+ * @param proto L4 protocol.
+ * @param bibe_index ST entry index.
+ *
+ * @return BIB entry if found.
+ */
+nat64_db_st_entry_t *nat64_db_st_entry_by_index (nat64_db_t * db,
+						 u8 proto, u32 ste_index);
+#endif /* __included_nat64_db_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/nat/nat64/nat64_doc.md b/src/plugins/nat/nat64/nat64_doc.md
new file mode 100644
index 00000000000..f65b46338b0
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64_doc.md
@@ -0,0 +1,73 @@
+# Stateful NAT64: Network Address and Protocol Translation from IPv6 Clients to IPv4 Servers {#nat64_doc}
+
+## Introduction
+
+Stateful NAT64 in VPP allows IPv6-only clients to contact IPv4 servers using unicast UDP, TCP, or ICMP based on RFC 6146.
+
+## Configuration
+
+### Enable/disable NAT64 feature on the interface
+
+> set interface nat64 in|out <intfc> [del]
+
+in: inside/local/IPv6 network
+out: outside/external/IPv4 network
+intfc: interface name
+
+### Add/delete NAT64 pool address
+
+One or more public IPv4 addresses assigned to a NAT64 are shared among several IPv6-only clients.
+
+> nat64 add pool address <ip4-range-start> [- <ip4-range-end>] [tenant-vrf <tenant-vrf-id>] [del]
+
+ip4-range-start: First IPv4 address of the range 
+ip4-range-end: Last IPv4 address of the range (optional, not used for single address)
+tenant-vrf-id: VRF id of the tenant associated with the pool address (optional, if not set pool address is global)
+
+### Add/delete static BIB entry
+
+Stateful NAT64 also supports IPv4-initiated communications to a subset of the IPv6 hosts through staticaly configured bindings.
+
+> nat64 add static bib <ip6-addr> <in-port> <ip4-addr> <out-port> tcp|udp|icmp [vfr <table-id>] [del]
+
+ip6-addr: inside IPv6 address of the host
+in-port: inside port or ICMPv6 identifier
+ip4-addr: outside IPv4 address of the host
+out-port: outside port or ICMPv4 identifier
+table-id: VRF id of the tenant associated with the BIB entry (optional, default use global VRF)
+
+### Set NAT64 session timeouts
+
+Session is deleted when timer expires. If all sessions corresponding to a dynamically create BIB entry are deleted, then the BIB entry is also deleted. When packets are flowing sessiom timer is refreshed to keep the session alive.
+
+> set nat64 timeouts udp <sec> icmp <sec> tcp-trans <sec> tcp-est <sec> tcp-incoming-syn <sec> | reset
+
+udp: UDP session timeout value (default 300sec)
+icmp: ICMP session timeout value (default 60sec)
+tcp-trans: transitory TCP session timeout value (default 240sec)
+tcp-est: established TCP session timeout value (default 7440sec)
+tcp-incoming-syn: incoming SYN TCP session timeout value (default 6sec)
+reset: reset timers to default values
+
+### Set NAT64 prefix 
+
+Stateful NAT64 support the algorithm for generating IPv6 representations of IPv4 addresses defined in RFC 6052. If no prefix is configured, Well-Known Prefix (64:ff9b::/96) is used. 
+
+> nat64 add prefix <ip6-prefix>/<plen> [tenant-vrf <vrf-id>] [del]
+
+ip6-prefix: IPv6 prefix
+plen: prefix length (valid values: 32, 40, 48, 56, 64, or 96)
+tenant-vrf: VRF id of the tenant associated with the prefix
+
+### Show commands
+
+> show nat64 pool
+> show nat64 interfaces
+> show nat64 bib tcp|udp|icmp
+> show nat64 session table tcp|udp|icmp
+> show nat64 timeouts
+> show nat64 prefix
+
+## Notes
+
+Multi thread is not supported yet (CLI/API commands are disabled when VPP runs with multiple threads).
diff --git a/src/plugins/nat/nat64/nat64_in2out.c b/src/plugins/nat/nat64/nat64_in2out.c
new file mode 100644
index 00000000000..5d98277d443
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64_in2out.c
@@ -0,0 +1,1411 @@
+/*
+ * Copyright (c) 2020 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 <nat/nat64/nat64.h>
+#include <vnet/ip/ip6_to_ip4.h>
+#include <vnet/fib/fib_table.h>
+#include <nat/lib/nat_inlines.h>
+
+typedef struct
+{
+  u32 sw_if_index;
+  u32 next_index;
+  u8 is_slow_path;
+} nat64_in2out_trace_t;
+
+static u8 *
+format_nat64_in2out_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 *);
+  nat64_in2out_trace_t *t = va_arg (*args, nat64_in2out_trace_t *);
+  char *tag;
+
+  tag = t->is_slow_path ? "NAT64-in2out-slowpath" : "NAT64-in2out";
+
+  s =
+    format (s, "%s: sw_if_index %d, next index %d", tag, t->sw_if_index,
+	    t->next_index);
+
+  return s;
+}
+
+#define foreach_nat64_in2out_error                       \
+_(UNSUPPORTED_PROTOCOL, "unsupported protocol")          \
+_(NO_TRANSLATION, "no translation")                      \
+_(UNKNOWN, "unknown")
+
+
+typedef enum
+{
+#define _(sym,str) NAT64_IN2OUT_ERROR_##sym,
+  foreach_nat64_in2out_error
+#undef _
+    NAT64_IN2OUT_N_ERROR,
+} nat64_in2out_error_t;
+
+static char *nat64_in2out_error_strings[] = {
+#define _(sym,string) string,
+  foreach_nat64_in2out_error
+#undef _
+};
+
+typedef enum
+{
+  NAT64_IN2OUT_NEXT_IP4_LOOKUP,
+  NAT64_IN2OUT_NEXT_IP6_LOOKUP,
+  NAT64_IN2OUT_NEXT_DROP,
+  NAT64_IN2OUT_NEXT_SLOWPATH,
+  NAT64_IN2OUT_N_NEXT,
+} nat64_in2out_next_t;
+
+typedef struct nat64_in2out_set_ctx_t_
+{
+  vlib_buffer_t *b;
+  vlib_main_t *vm;
+  u32 thread_index;
+} nat64_in2out_set_ctx_t;
+
+static inline u8
+nat64_not_translate (u32 sw_if_index, ip6_address_t ip6_addr)
+{
+  ip6_address_t *addr;
+  ip6_main_t *im6 = &ip6_main;
+  ip_lookup_main_t *lm6 = &im6->lookup_main;
+  ip_interface_address_t *ia = 0;
+
+  /* *INDENT-OFF* */
+  foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
+  ({
+	addr = ip_interface_address_get_address (lm6, ia);
+	if (0 == ip6_address_compare (addr, &ip6_addr))
+		return 1;
+  }));
+  /* *INDENT-ON* */
+
+  return 0;
+}
+
+/**
+ * @brief Check whether is a hairpinning.
+ *
+ * If the destination IP address of the packet is an IPv4 address assigned to
+ * the NAT64 itself, then the packet is a hairpin packet.
+ *
+ * param dst_addr Destination address of the packet.
+ *
+ * @returns 1 if hairpinning, otherwise 0.
+ */
+static_always_inline int
+is_hairpinning (ip6_address_t * dst_addr)
+{
+  nat64_main_t *nm = &nat64_main;
+  int i;
+
+  for (i = 0; i < vec_len (nm->addr_pool); i++)
+    {
+      if (nm->addr_pool[i].addr.as_u32 == dst_addr->as_u32[3])
+	return 1;
+    }
+
+  return 0;
+}
+
+static int
+nat64_in2out_tcp_udp (vlib_main_t * vm, vlib_buffer_t * p, u16 l4_offset,
+		      u16 frag_hdr_offset, nat64_in2out_set_ctx_t * ctx)
+{
+  ip6_header_t *ip6;
+  ip_csum_t csum = 0;
+  ip4_header_t *ip4;
+  u16 fragment_id;
+  u8 frag_more;
+  u16 frag_offset;
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  ip46_address_t old_saddr, old_daddr;
+  ip4_address_t new_daddr;
+  u32 sw_if_index, fib_index;
+  u8 proto = vnet_buffer (p)->ip.reass.ip_proto;
+  u16 sport = vnet_buffer (p)->ip.reass.l4_src_port;
+  u16 dport = vnet_buffer (p)->ip.reass.l4_dst_port;
+  nat64_db_t *db = &nm->db[ctx->thread_index];
+
+  ip6 = vlib_buffer_get_current (p);
+
+  vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
+  ip4 = vlib_buffer_get_current (p);
+
+  u32 ip_version_traffic_class_and_flow_label =
+    ip6->ip_version_traffic_class_and_flow_label;
+  u16 payload_length = ip6->payload_length;
+  u8 hop_limit = ip6->hop_limit;
+
+  old_saddr.as_u64[0] = ip6->src_address.as_u64[0];
+  old_saddr.as_u64[1] = ip6->src_address.as_u64[1];
+  old_daddr.as_u64[0] = ip6->dst_address.as_u64[0];
+  old_daddr.as_u64[1] = ip6->dst_address.as_u64[1];
+
+  if (PREDICT_FALSE (frag_hdr_offset))
+    {
+      //Only the first fragment
+      ip6_frag_hdr_t *hdr =
+	(ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_hdr_offset);
+      fragment_id = frag_id_6to4 (hdr->identification);
+      frag_more = ip6_frag_hdr_more (hdr);
+      frag_offset = ip6_frag_hdr_offset (hdr);
+    }
+  else
+    {
+      fragment_id = 0;
+      frag_offset = 0;
+      frag_more = 0;
+    }
+
+  ip4->ip_version_and_header_length =
+    IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
+  ip4->tos = ip6_translate_tos (ip_version_traffic_class_and_flow_label);
+  ip4->length =
+    u16_net_add (payload_length, sizeof (*ip4) + sizeof (*ip6) - l4_offset);
+  ip4->fragment_id = fragment_id;
+  ip4->flags_and_fragment_offset =
+    clib_host_to_net_u16 (frag_offset |
+			  (frag_more ? IP4_HEADER_FLAG_MORE_FRAGMENTS : 0));
+  ip4->ttl = hop_limit;
+  ip4->protocol = (proto == IP_PROTOCOL_ICMP6) ? IP_PROTOCOL_ICMP : proto;
+
+  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+  fib_index =
+    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+  ste =
+    nat64_db_st_entry_find (db, &old_saddr, &old_daddr, sport, dport, proto,
+			    fib_index, 1);
+
+  if (ste)
+    {
+      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+    }
+  else
+    {
+      bibe =
+	nat64_db_bib_entry_find (db, &old_saddr, sport, proto, fib_index, 1);
+
+      if (!bibe)
+	{
+	  u16 out_port;
+	  ip4_address_t out_addr;
+	  if (nat64_alloc_out_addr_and_port
+	      (fib_index, ip_proto_to_nat_proto (proto), &out_addr,
+	       &out_port, ctx->thread_index))
+	    return -1;
+
+	  bibe =
+	    nat64_db_bib_entry_create (ctx->thread_index, db,
+				       &old_saddr.ip6, &out_addr, sport,
+				       out_port, fib_index, proto, 0);
+	  if (!bibe)
+	    return -1;
+
+	  vlib_set_simple_counter (&nm->total_bibs, ctx->thread_index, 0,
+				   db->bib.bib_entries_num);
+	}
+
+      nat64_extract_ip4 (&old_daddr.ip6, &new_daddr, fib_index);
+      ste =
+	nat64_db_st_entry_create (ctx->thread_index, db, bibe,
+				  &old_daddr.ip6, &new_daddr, dport);
+      if (!ste)
+	return -1;
+
+      vlib_set_simple_counter (&nm->total_sessions, ctx->thread_index, 0,
+			       db->st.st_entries_num);
+    }
+
+  ip4->src_address.as_u32 = bibe->out_addr.as_u32;
+  ip4->dst_address.as_u32 = ste->out_r_addr.as_u32;
+
+  ip4->checksum = ip4_header_checksum (ip4);
+
+  if (!vnet_buffer (p)->ip.reass.is_non_first_fragment)
+    {
+      udp_header_t *udp = (udp_header_t *) (ip4 + 1);
+      udp->src_port = bibe->out_port;
+
+      //UDP checksum is optional over IPv4
+      if (proto == IP_PROTOCOL_UDP)
+	{
+	  udp->checksum = 0;
+	}
+      else
+	{
+	  tcp_header_t *tcp = (tcp_header_t *) (ip4 + 1);
+	  csum = ip_csum_sub_even (tcp->checksum, old_saddr.as_u64[0]);
+	  csum = ip_csum_sub_even (csum, old_saddr.as_u64[1]);
+	  csum = ip_csum_sub_even (csum, old_daddr.as_u64[0]);
+	  csum = ip_csum_sub_even (csum, old_daddr.as_u64[1]);
+	  csum = ip_csum_add_even (csum, ip4->dst_address.as_u32);
+	  csum = ip_csum_add_even (csum, ip4->src_address.as_u32);
+	  csum = ip_csum_sub_even (csum, sport);
+	  csum = ip_csum_add_even (csum, udp->src_port);
+	  mss_clamping (nm->mss_clamping, tcp, &csum);
+	  tcp->checksum = ip_csum_fold (csum);
+
+	  nat64_tcp_session_set_state (ste, tcp, 1);
+	}
+    }
+
+  nat64_session_reset_timeout (ste, ctx->vm);
+
+  return 0;
+}
+
+static int
+nat64_in2out_icmp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_in2out_set_ctx_t *ctx = arg;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  ip46_address_t saddr, daddr;
+  u32 sw_if_index, fib_index;
+  icmp46_header_t *icmp = ip6_next_header (ip6);
+  nat64_db_t *db = &nm->db[ctx->thread_index];
+
+  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+  fib_index =
+    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+  saddr.as_u64[0] = ip6->src_address.as_u64[0];
+  saddr.as_u64[1] = ip6->src_address.as_u64[1];
+  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
+  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
+
+  if (icmp->type == ICMP4_echo_request || icmp->type == ICMP4_echo_reply)
+    {
+      u16 in_id = ((u16 *) (icmp))[2];
+      ste =
+	nat64_db_st_entry_find (db, &saddr, &daddr, in_id, 0,
+				IP_PROTOCOL_ICMP, fib_index, 1);
+
+      if (ste)
+	{
+	  bibe =
+	    nat64_db_bib_entry_by_index (db, IP_PROTOCOL_ICMP,
+					 ste->bibe_index);
+	  if (!bibe)
+	    return -1;
+	}
+      else
+	{
+	  bibe =
+	    nat64_db_bib_entry_find (db, &saddr, in_id,
+				     IP_PROTOCOL_ICMP, fib_index, 1);
+
+	  if (!bibe)
+	    {
+	      u16 out_id;
+	      ip4_address_t out_addr;
+	      if (nat64_alloc_out_addr_and_port
+		  (fib_index, NAT_PROTOCOL_ICMP, &out_addr, &out_id,
+		   ctx->thread_index))
+		return -1;
+
+	      bibe =
+		nat64_db_bib_entry_create (ctx->thread_index, db,
+					   &ip6->src_address, &out_addr,
+					   in_id, out_id, fib_index,
+					   IP_PROTOCOL_ICMP, 0);
+	      if (!bibe)
+		return -1;
+
+	      vlib_set_simple_counter (&nm->total_bibs, ctx->thread_index, 0,
+				       db->bib.bib_entries_num);
+	    }
+
+	  nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
+	  ste =
+	    nat64_db_st_entry_create (ctx->thread_index, db, bibe,
+				      &ip6->dst_address, &daddr.ip4, 0);
+	  if (!ste)
+	    return -1;
+
+	  vlib_set_simple_counter (&nm->total_sessions, ctx->thread_index, 0,
+				   db->st.st_entries_num);
+	}
+
+      nat64_session_reset_timeout (ste, ctx->vm);
+
+      ip4->src_address.as_u32 = bibe->out_addr.as_u32;
+      ((u16 *) (icmp))[2] = bibe->out_port;
+
+      ip4->dst_address.as_u32 = ste->out_r_addr.as_u32;
+    }
+  else
+    {
+      if (!vec_len (nm->addr_pool))
+	return -1;
+
+      ip4->src_address.as_u32 = nm->addr_pool[0].addr.as_u32;
+      nat64_extract_ip4 (&ip6->dst_address, &ip4->dst_address, fib_index);
+    }
+
+  return 0;
+}
+
+static int
+nat64_in2out_inner_icmp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4,
+				void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_in2out_set_ctx_t *ctx = arg;
+  nat64_db_st_entry_t *ste;
+  nat64_db_bib_entry_t *bibe;
+  ip46_address_t saddr, daddr;
+  u32 sw_if_index, fib_index;
+  u8 proto = ip6->protocol;
+  nat64_db_t *db = &nm->db[ctx->thread_index];
+
+  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+  fib_index =
+    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+  saddr.as_u64[0] = ip6->src_address.as_u64[0];
+  saddr.as_u64[1] = ip6->src_address.as_u64[1];
+  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
+  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
+
+  if (proto == IP_PROTOCOL_ICMP6)
+    {
+      icmp46_header_t *icmp = ip6_next_header (ip6);
+      u16 in_id = ((u16 *) (icmp))[2];
+      proto = IP_PROTOCOL_ICMP;
+
+      if (!
+	  (icmp->type == ICMP4_echo_request
+	   || icmp->type == ICMP4_echo_reply))
+	return -1;
+
+      ste =
+	nat64_db_st_entry_find (db, &daddr, &saddr, in_id, 0, proto,
+				fib_index, 1);
+      if (!ste)
+	return -1;
+
+      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+
+      ip4->dst_address.as_u32 = bibe->out_addr.as_u32;
+      ((u16 *) (icmp))[2] = bibe->out_port;
+      ip4->src_address.as_u32 = ste->out_r_addr.as_u32;
+    }
+  else
+    {
+      udp_header_t *udp = ip6_next_header (ip6);
+      tcp_header_t *tcp = ip6_next_header (ip6);
+      u16 *checksum;
+      ip_csum_t csum;
+
+      u16 sport = udp->src_port;
+      u16 dport = udp->dst_port;
+
+      ste =
+	nat64_db_st_entry_find (db, &daddr, &saddr, dport, sport, proto,
+				fib_index, 1);
+      if (!ste)
+	return -1;
+
+      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+
+      ip4->dst_address.as_u32 = bibe->out_addr.as_u32;
+      udp->dst_port = bibe->out_port;
+      ip4->src_address.as_u32 = ste->out_r_addr.as_u32;
+
+      if (proto == IP_PROTOCOL_TCP)
+	checksum = &tcp->checksum;
+      else
+	checksum = &udp->checksum;
+      csum = ip_csum_sub_even (*checksum, dport);
+      csum = ip_csum_add_even (csum, udp->dst_port);
+      *checksum = ip_csum_fold (csum);
+    }
+
+  return 0;
+}
+
+typedef struct unk_proto_st_walk_ctx_t_
+{
+  ip6_address_t src_addr;
+  ip6_address_t dst_addr;
+  ip4_address_t out_addr;
+  u32 fib_index;
+  u32 thread_index;
+  u8 proto;
+} unk_proto_st_walk_ctx_t;
+
+static int
+unk_proto_st_walk (nat64_db_st_entry_t * ste, void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  unk_proto_st_walk_ctx_t *ctx = arg;
+  nat64_db_bib_entry_t *bibe;
+  ip46_address_t saddr, daddr;
+  nat64_db_t *db = &nm->db[ctx->thread_index];
+
+  if (ip6_address_is_equal (&ste->in_r_addr, &ctx->dst_addr))
+    {
+      bibe = nat64_db_bib_entry_by_index (db, ste->proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+
+      if (ip6_address_is_equal (&bibe->in_addr, &ctx->src_addr)
+	  && bibe->fib_index == ctx->fib_index)
+	{
+	  clib_memset (&saddr, 0, sizeof (saddr));
+	  saddr.ip4.as_u32 = bibe->out_addr.as_u32;
+	  clib_memset (&daddr, 0, sizeof (daddr));
+	  nat64_extract_ip4 (&ctx->dst_addr, &daddr.ip4, ctx->fib_index);
+
+	  if (nat64_db_st_entry_find
+	      (db, &daddr, &saddr, 0, 0, ctx->proto, ctx->fib_index, 0))
+	    return -1;
+
+	  ctx->out_addr.as_u32 = bibe->out_addr.as_u32;
+	  return 1;
+	}
+    }
+
+  return 0;
+}
+
+static int
+nat64_in2out_unk_proto (vlib_main_t * vm, vlib_buffer_t * p, u8 l4_protocol,
+			u16 l4_offset, u16 frag_hdr_offset,
+			nat64_in2out_set_ctx_t * s_ctx)
+{
+  ip6_header_t *ip6;
+  ip4_header_t *ip4;
+  u16 fragment_id;
+  u16 frag_offset;
+  u8 frag_more;
+
+  ip6 = vlib_buffer_get_current (p);
+
+  ip4 = (ip4_header_t *) u8_ptr_add (ip6, l4_offset - sizeof (*ip4));
+
+  vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
+
+  if (PREDICT_FALSE (frag_hdr_offset))
+    {
+      //Only the first fragment
+      ip6_frag_hdr_t *hdr =
+	(ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_hdr_offset);
+      fragment_id = frag_id_6to4 (hdr->identification);
+      frag_offset = ip6_frag_hdr_offset (hdr);
+      frag_more = ip6_frag_hdr_more (hdr);
+    }
+  else
+    {
+      fragment_id = 0;
+      frag_offset = 0;
+      frag_more = 0;
+    }
+
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  ip46_address_t saddr, daddr, addr;
+  u32 sw_if_index, fib_index;
+  int i;
+  nat64_db_t *db = &nm->db[s_ctx->thread_index];
+
+  sw_if_index = vnet_buffer (s_ctx->b)->sw_if_index[VLIB_RX];
+  fib_index =
+    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+  saddr.as_u64[0] = ip6->src_address.as_u64[0];
+  saddr.as_u64[1] = ip6->src_address.as_u64[1];
+  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
+  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
+
+  ste =
+    nat64_db_st_entry_find (db, &saddr, &daddr, 0, 0, l4_protocol, fib_index,
+			    1);
+
+  if (ste)
+    {
+      bibe = nat64_db_bib_entry_by_index (db, l4_protocol, ste->bibe_index);
+      if (!bibe)
+	return -1;
+    }
+  else
+    {
+      bibe =
+	nat64_db_bib_entry_find (db, &saddr, 0, l4_protocol, fib_index, 1);
+
+      if (!bibe)
+	{
+	  /* Choose same out address as for TCP/UDP session to same dst */
+	  unk_proto_st_walk_ctx_t ctx = {
+	    .src_addr.as_u64[0] = ip6->src_address.as_u64[0],
+	    .src_addr.as_u64[1] = ip6->src_address.as_u64[1],
+	    .dst_addr.as_u64[0] = ip6->dst_address.as_u64[0],
+	    .dst_addr.as_u64[1] = ip6->dst_address.as_u64[1],
+	    .out_addr.as_u32 = 0,
+	    .fib_index = fib_index,
+	    .proto = l4_protocol,
+	    .thread_index = s_ctx->thread_index,
+	  };
+
+	  nat64_db_st_walk (db, IP_PROTOCOL_TCP, unk_proto_st_walk, &ctx);
+
+	  if (!ctx.out_addr.as_u32)
+	    nat64_db_st_walk (db, IP_PROTOCOL_UDP, unk_proto_st_walk, &ctx);
+
+	  /* Verify if out address is not already in use for protocol */
+	  clib_memset (&addr, 0, sizeof (addr));
+	  addr.ip4.as_u32 = ctx.out_addr.as_u32;
+	  if (nat64_db_bib_entry_find (db, &addr, 0, l4_protocol, 0, 0))
+	    ctx.out_addr.as_u32 = 0;
+
+	  if (!ctx.out_addr.as_u32)
+	    {
+	      for (i = 0; i < vec_len (nm->addr_pool); i++)
+		{
+		  addr.ip4.as_u32 = nm->addr_pool[i].addr.as_u32;
+		  if (!nat64_db_bib_entry_find
+		      (db, &addr, 0, l4_protocol, 0, 0))
+		    break;
+		}
+	    }
+
+	  if (!ctx.out_addr.as_u32)
+	    return -1;
+
+	  bibe =
+	    nat64_db_bib_entry_create (s_ctx->thread_index, db,
+				       &ip6->src_address, &ctx.out_addr,
+				       0, 0, fib_index, l4_protocol, 0);
+	  if (!bibe)
+	    return -1;
+
+	  vlib_set_simple_counter (&nm->total_bibs, s_ctx->thread_index, 0,
+				   db->bib.bib_entries_num);
+	}
+
+      nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
+      ste =
+	nat64_db_st_entry_create (s_ctx->thread_index, db, bibe,
+				  &ip6->dst_address, &daddr.ip4, 0);
+      if (!ste)
+	return -1;
+
+      vlib_set_simple_counter (&nm->total_sessions, s_ctx->thread_index, 0,
+			       db->st.st_entries_num);
+    }
+
+  nat64_session_reset_timeout (ste, s_ctx->vm);
+
+  ip4->src_address.as_u32 = bibe->out_addr.as_u32;
+  ip4->dst_address.as_u32 = ste->out_r_addr.as_u32;
+
+  ip4->ip_version_and_header_length =
+    IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
+  ip4->tos = ip6_translate_tos (ip6->ip_version_traffic_class_and_flow_label);
+  ip4->length = u16_net_add (ip6->payload_length,
+			     sizeof (*ip4) + sizeof (*ip6) - l4_offset);
+  ip4->fragment_id = fragment_id;
+  ip4->flags_and_fragment_offset =
+    clib_host_to_net_u16 (frag_offset |
+			  (frag_more ? IP4_HEADER_FLAG_MORE_FRAGMENTS : 0));
+  ip4->ttl = ip6->hop_limit;
+  ip4->protocol = l4_protocol;
+  ip4->checksum = ip4_header_checksum (ip4);
+
+  return 0;
+}
+
+static int
+nat64_in2out_tcp_udp_hairpinning (vlib_main_t * vm, vlib_buffer_t * b,
+				  ip6_header_t * ip6, u32 l4_offset,
+				  u32 thread_index)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  ip46_address_t saddr, daddr;
+  u32 sw_if_index, fib_index;
+  udp_header_t *udp = (udp_header_t *) u8_ptr_add (ip6, l4_offset);
+  tcp_header_t *tcp = (tcp_header_t *) u8_ptr_add (ip6, l4_offset);
+  u8 proto = vnet_buffer (b)->ip.reass.ip_proto;
+  u16 sport = vnet_buffer (b)->ip.reass.l4_src_port;
+  u16 dport = vnet_buffer (b)->ip.reass.l4_dst_port;
+  u16 *checksum = NULL;
+  ip_csum_t csum = 0;
+  nat64_db_t *db = &nm->db[thread_index];
+
+  sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
+  fib_index =
+    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+  saddr.as_u64[0] = ip6->src_address.as_u64[0];
+  saddr.as_u64[1] = ip6->src_address.as_u64[1];
+  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
+  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
+
+  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
+    {
+      if (proto == IP_PROTOCOL_UDP)
+	checksum = &udp->checksum;
+      else
+	checksum = &tcp->checksum;
+      csum = ip_csum_sub_even (*checksum, ip6->src_address.as_u64[0]);
+      csum = ip_csum_sub_even (csum, ip6->src_address.as_u64[1]);
+      csum = ip_csum_sub_even (csum, ip6->dst_address.as_u64[0]);
+      csum = ip_csum_sub_even (csum, ip6->dst_address.as_u64[1]);
+    }
+
+  ste =
+    nat64_db_st_entry_find (db, &saddr, &daddr, sport, dport, proto,
+			    fib_index, 1);
+
+  if (ste)
+    {
+      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+    }
+  else
+    {
+      bibe = nat64_db_bib_entry_find (db, &saddr, sport, proto, fib_index, 1);
+
+      if (!bibe)
+	{
+	  u16 out_port;
+	  ip4_address_t out_addr;
+	  if (nat64_alloc_out_addr_and_port
+	      (fib_index, ip_proto_to_nat_proto (proto), &out_addr,
+	       &out_port, thread_index))
+	    return -1;
+
+	  bibe =
+	    nat64_db_bib_entry_create (thread_index, db, &ip6->src_address,
+				       &out_addr, sport, out_port, fib_index,
+				       proto, 0);
+	  if (!bibe)
+	    return -1;
+
+	  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
+				   db->bib.bib_entries_num);
+	}
+
+      nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
+      ste =
+	nat64_db_st_entry_create (thread_index, db, bibe, &ip6->dst_address,
+				  &daddr.ip4, dport);
+      if (!ste)
+	return -1;
+
+      vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
+			       db->st.st_entries_num);
+    }
+
+  if (proto == IP_PROTOCOL_TCP)
+    nat64_tcp_session_set_state (ste, tcp, 1);
+
+  nat64_session_reset_timeout (ste, vm);
+
+  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
+    {
+      udp->src_port = bibe->out_port;
+    }
+
+  nat64_compose_ip6 (&ip6->src_address, &bibe->out_addr, fib_index);
+
+  clib_memset (&daddr, 0, sizeof (daddr));
+  daddr.ip4.as_u32 = ste->out_r_addr.as_u32;
+
+  bibe = 0;
+  /* *INDENT-OFF* */
+  vec_foreach (db, nm->db)
+    {
+      bibe = nat64_db_bib_entry_find (db, &daddr, dport, proto, 0, 0);
+
+      if (bibe)
+	break;
+    }
+  /* *INDENT-ON* */
+
+  if (!bibe)
+    return -1;
+
+  ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+  ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+
+  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
+    {
+      csum = ip_csum_add_even (csum, ip6->src_address.as_u64[0]);
+      csum = ip_csum_add_even (csum, ip6->src_address.as_u64[1]);
+      csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[0]);
+      csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[1]);
+      csum = ip_csum_sub_even (csum, sport);
+      csum = ip_csum_sub_even (csum, dport);
+      udp->dst_port = bibe->in_port;
+      csum = ip_csum_add_even (csum, udp->src_port);
+      csum = ip_csum_add_even (csum, udp->dst_port);
+      *checksum = ip_csum_fold (csum);
+    }
+
+  return 0;
+}
+
+static int
+nat64_in2out_icmp_hairpinning (vlib_main_t * vm, vlib_buffer_t * b,
+			       ip6_header_t * ip6, u32 thread_index)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  icmp46_header_t *icmp = ip6_next_header (ip6);
+  ip6_header_t *inner_ip6;
+  ip46_address_t saddr, daddr;
+  u32 sw_if_index, fib_index;
+  u8 proto;
+  udp_header_t *udp;
+  tcp_header_t *tcp;
+  u16 *checksum, sport, dport;
+  ip_csum_t csum;
+  nat64_db_t *db = &nm->db[thread_index];
+
+  if (icmp->type == ICMP6_echo_request || icmp->type == ICMP6_echo_reply)
+    return -1;
+
+  inner_ip6 = (ip6_header_t *) u8_ptr_add (icmp, 8);
+
+  proto = inner_ip6->protocol;
+
+  if (proto == IP_PROTOCOL_ICMP6)
+    return -1;
+
+  sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
+  fib_index =
+    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+  saddr.as_u64[0] = inner_ip6->src_address.as_u64[0];
+  saddr.as_u64[1] = inner_ip6->src_address.as_u64[1];
+  daddr.as_u64[0] = inner_ip6->dst_address.as_u64[0];
+  daddr.as_u64[1] = inner_ip6->dst_address.as_u64[1];
+
+  udp = ip6_next_header (inner_ip6);
+  tcp = ip6_next_header (inner_ip6);
+
+  sport = udp->src_port;
+  dport = udp->dst_port;
+
+  if (proto == IP_PROTOCOL_UDP)
+    checksum = &udp->checksum;
+  else
+    checksum = &tcp->checksum;
+
+  csum = ip_csum_sub_even (*checksum, inner_ip6->src_address.as_u64[0]);
+  csum = ip_csum_sub_even (csum, inner_ip6->src_address.as_u64[1]);
+  csum = ip_csum_sub_even (csum, inner_ip6->dst_address.as_u64[0]);
+  csum = ip_csum_sub_even (csum, inner_ip6->dst_address.as_u64[1]);
+  csum = ip_csum_sub_even (csum, sport);
+  csum = ip_csum_sub_even (csum, dport);
+
+  ste =
+    nat64_db_st_entry_find (db, &daddr, &saddr, dport, sport, proto,
+			    fib_index, 1);
+  if (!ste)
+    return -1;
+
+  bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+  if (!bibe)
+    return -1;
+
+  dport = udp->dst_port = bibe->out_port;
+  nat64_compose_ip6 (&inner_ip6->dst_address, &bibe->out_addr, fib_index);
+
+  clib_memset (&saddr, 0, sizeof (saddr));
+  clib_memset (&daddr, 0, sizeof (daddr));
+  saddr.ip4.as_u32 = ste->out_r_addr.as_u32;
+  daddr.ip4.as_u32 = bibe->out_addr.as_u32;
+
+  ste = 0;
+  /* *INDENT-OFF* */
+  vec_foreach (db, nm->db)
+    {
+      ste = nat64_db_st_entry_find (db, &saddr, &daddr, sport, dport, proto,
+                                    0, 0);
+
+      if (ste)
+        break;
+    }
+  /* *INDENT-ON* */
+
+  if (!ste)
+    return -1;
+
+  bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+  if (!bibe)
+    return -1;
+
+  inner_ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0];
+  inner_ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1];
+  udp->src_port = bibe->in_port;
+
+  csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[0]);
+  csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[1]);
+  csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[0]);
+  csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[1]);
+  csum = ip_csum_add_even (csum, udp->src_port);
+  csum = ip_csum_add_even (csum, udp->dst_port);
+  *checksum = ip_csum_fold (csum);
+
+  if (!vec_len (nm->addr_pool))
+    return -1;
+
+  nat64_compose_ip6 (&ip6->src_address, &nm->addr_pool[0].addr, fib_index);
+  ip6->dst_address.as_u64[0] = inner_ip6->src_address.as_u64[0];
+  ip6->dst_address.as_u64[1] = inner_ip6->src_address.as_u64[1];
+
+  icmp->checksum = 0;
+  csum = ip_csum_with_carry (0, ip6->payload_length);
+  csum = ip_csum_with_carry (csum, clib_host_to_net_u16 (ip6->protocol));
+  csum = ip_csum_with_carry (csum, ip6->src_address.as_u64[0]);
+  csum = ip_csum_with_carry (csum, ip6->src_address.as_u64[1]);
+  csum = ip_csum_with_carry (csum, ip6->dst_address.as_u64[0]);
+  csum = ip_csum_with_carry (csum, ip6->dst_address.as_u64[1]);
+  csum =
+    ip_incremental_checksum (csum, icmp,
+			     clib_net_to_host_u16 (ip6->payload_length));
+  icmp->checksum = ~ip_csum_fold (csum);
+
+  return 0;
+}
+
+static int
+nat64_in2out_unk_proto_hairpinning (vlib_main_t * vm, vlib_buffer_t * b,
+				    ip6_header_t * ip6, u32 thread_index)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  ip46_address_t saddr, daddr, addr;
+  u32 sw_if_index, fib_index;
+  u8 proto = ip6->protocol;
+  int i;
+  nat64_db_t *db = &nm->db[thread_index];
+
+  sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
+  fib_index =
+    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+  saddr.as_u64[0] = ip6->src_address.as_u64[0];
+  saddr.as_u64[1] = ip6->src_address.as_u64[1];
+  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
+  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
+
+  ste =
+    nat64_db_st_entry_find (db, &saddr, &daddr, 0, 0, proto, fib_index, 1);
+
+  if (ste)
+    {
+      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+    }
+  else
+    {
+      bibe = nat64_db_bib_entry_find (db, &saddr, 0, proto, fib_index, 1);
+
+      if (!bibe)
+	{
+	  /* Choose same out address as for TCP/UDP session to same dst */
+	  unk_proto_st_walk_ctx_t ctx = {
+	    .src_addr.as_u64[0] = ip6->src_address.as_u64[0],
+	    .src_addr.as_u64[1] = ip6->src_address.as_u64[1],
+	    .dst_addr.as_u64[0] = ip6->dst_address.as_u64[0],
+	    .dst_addr.as_u64[1] = ip6->dst_address.as_u64[1],
+	    .out_addr.as_u32 = 0,
+	    .fib_index = fib_index,
+	    .proto = proto,
+	    .thread_index = thread_index,
+	  };
+
+	  nat64_db_st_walk (db, IP_PROTOCOL_TCP, unk_proto_st_walk, &ctx);
+
+	  if (!ctx.out_addr.as_u32)
+	    nat64_db_st_walk (db, IP_PROTOCOL_UDP, unk_proto_st_walk, &ctx);
+
+	  /* Verify if out address is not already in use for protocol */
+	  clib_memset (&addr, 0, sizeof (addr));
+	  addr.ip4.as_u32 = ctx.out_addr.as_u32;
+	  if (nat64_db_bib_entry_find (db, &addr, 0, proto, 0, 0))
+	    ctx.out_addr.as_u32 = 0;
+
+	  if (!ctx.out_addr.as_u32)
+	    {
+	      for (i = 0; i < vec_len (nm->addr_pool); i++)
+		{
+		  addr.ip4.as_u32 = nm->addr_pool[i].addr.as_u32;
+		  if (!nat64_db_bib_entry_find (db, &addr, 0, proto, 0, 0))
+		    break;
+		}
+	    }
+
+	  if (!ctx.out_addr.as_u32)
+	    return -1;
+
+	  bibe =
+	    nat64_db_bib_entry_create (thread_index, db, &ip6->src_address,
+				       &ctx.out_addr, 0, 0, fib_index, proto,
+				       0);
+	  if (!bibe)
+	    return -1;
+
+	  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
+				   db->bib.bib_entries_num);
+	}
+
+      nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
+      ste =
+	nat64_db_st_entry_create (thread_index, db, bibe, &ip6->dst_address,
+				  &daddr.ip4, 0);
+      if (!ste)
+	return -1;
+
+      vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
+			       db->st.st_entries_num);
+    }
+
+  nat64_session_reset_timeout (ste, vm);
+
+  nat64_compose_ip6 (&ip6->src_address, &bibe->out_addr, fib_index);
+
+  clib_memset (&daddr, 0, sizeof (daddr));
+  daddr.ip4.as_u32 = ste->out_r_addr.as_u32;
+
+  bibe = 0;
+  /* *INDENT-OFF* */
+  vec_foreach (db, nm->db)
+    {
+      bibe = nat64_db_bib_entry_find (db, &daddr, 0, proto, 0, 0);
+
+      if (bibe)
+	break;
+    }
+  /* *INDENT-ON* */
+
+  if (!bibe)
+    return -1;
+
+  ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+  ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+
+  return 0;
+}
+
+static inline uword
+nat64_in2out_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+			     vlib_frame_t * frame, u8 is_slow_path)
+{
+  u32 n_left_from, *from, *to_next;
+  nat64_in2out_next_t next_index;
+  u32 thread_index = vm->thread_index;
+  nat64_main_t *nm = &nat64_main;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  u32 bi0;
+	  vlib_buffer_t *b0;
+	  u32 next0;
+	  ip6_header_t *ip60;
+	  u16 l4_offset0, frag_hdr_offset0;
+	  u8 l4_protocol0;
+	  u32 proto0;
+	  nat64_in2out_set_ctx_t ctx0;
+	  u32 sw_if_index0;
+
+	  /* speculatively enqueue b0 to the current next frame */
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  ip60 = vlib_buffer_get_current (b0);
+
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+	  ctx0.b = b0;
+	  ctx0.vm = vm;
+	  ctx0.thread_index = thread_index;
+
+	  next0 = NAT64_IN2OUT_NEXT_IP4_LOOKUP;
+
+	  if (PREDICT_FALSE
+	      (ip6_parse
+	       (vm, b0, ip60, b0->current_length, &l4_protocol0, &l4_offset0,
+		&frag_hdr_offset0)))
+	    {
+	      next0 = NAT64_IN2OUT_NEXT_DROP;
+	      b0->error = node->errors[NAT64_IN2OUT_ERROR_UNKNOWN];
+	      goto trace0;
+	    }
+
+	  if (nat64_not_translate (sw_if_index0, ip60->dst_address))
+	    {
+	      next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
+	      goto trace0;
+	    }
+
+	  proto0 = ip_proto_to_nat_proto (l4_protocol0);
+
+	  if (is_slow_path)
+	    {
+	      if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_OTHER))
+		{
+		  vlib_increment_simple_counter (&nm->counters.in2out.other,
+						 thread_index, sw_if_index0,
+						 1);
+		  if (is_hairpinning (&ip60->dst_address))
+		    {
+		      next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
+		      if (nat64_in2out_unk_proto_hairpinning
+			  (vm, b0, ip60, thread_index))
+			{
+			  next0 = NAT64_IN2OUT_NEXT_DROP;
+			  b0->error =
+			    node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+			}
+		      goto trace0;
+		    }
+
+		  if (nat64_in2out_unk_proto
+		      (vm, b0, l4_protocol0, l4_offset0, frag_hdr_offset0,
+		       &ctx0))
+		    {
+		      next0 = NAT64_IN2OUT_NEXT_DROP;
+		      b0->error =
+			node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+		      goto trace0;
+		    }
+		}
+	      goto trace0;
+	    }
+	  else
+	    {
+	      if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
+		{
+		  next0 = NAT64_IN2OUT_NEXT_SLOWPATH;
+		  goto trace0;
+		}
+	    }
+
+	  if (proto0 == NAT_PROTOCOL_ICMP)
+	    {
+	      vlib_increment_simple_counter (&nm->counters.in2out.icmp,
+					     thread_index, sw_if_index0, 1);
+	      if (is_hairpinning (&ip60->dst_address))
+		{
+		  next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
+		  if (nat64_in2out_icmp_hairpinning
+		      (vm, b0, ip60, thread_index))
+		    {
+		      next0 = NAT64_IN2OUT_NEXT_DROP;
+		      b0->error =
+			node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+		    }
+		  goto trace0;
+		}
+
+	      if (icmp6_to_icmp
+		  (vm, b0, nat64_in2out_icmp_set_cb, &ctx0,
+		   nat64_in2out_inner_icmp_set_cb, &ctx0))
+		{
+		  next0 = NAT64_IN2OUT_NEXT_DROP;
+		  b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+		  goto trace0;
+		}
+	    }
+	  else if (proto0 == NAT_PROTOCOL_TCP || proto0 == NAT_PROTOCOL_UDP)
+	    {
+	      if (proto0 == NAT_PROTOCOL_TCP)
+		vlib_increment_simple_counter (&nm->counters.in2out.tcp,
+					       thread_index, sw_if_index0, 1);
+	      else
+		vlib_increment_simple_counter (&nm->counters.in2out.udp,
+					       thread_index, sw_if_index0, 1);
+
+	      if (is_hairpinning (&ip60->dst_address))
+		{
+		  next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
+		  if (nat64_in2out_tcp_udp_hairpinning
+		      (vm, b0, ip60, l4_offset0, thread_index))
+		    {
+		      next0 = NAT64_IN2OUT_NEXT_DROP;
+		      b0->error =
+			node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+		    }
+		  goto trace0;
+		}
+
+	      if (nat64_in2out_tcp_udp
+		  (vm, b0, l4_offset0, frag_hdr_offset0, &ctx0))
+		{
+		  next0 = NAT64_IN2OUT_NEXT_DROP;
+		  b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+		  goto trace0;
+		}
+	    }
+
+	trace0:
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      nat64_in2out_trace_t *t =
+		vlib_add_trace (vm, node, b0, sizeof (*t));
+	      t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+	      t->next_index = next0;
+	      t->is_slow_path = is_slow_path;
+	    }
+
+	  if (next0 == NAT64_IN2OUT_NEXT_DROP)
+	    {
+	      vlib_increment_simple_counter (&nm->counters.in2out.drops,
+					     thread_index, sw_if_index0, 1);
+	    }
+
+
+	  /* verify speculative enqueue, maybe switch current next frame */
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+					   n_left_to_next, bi0, next0);
+	}
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+
+  return frame->n_vectors;
+}
+
+VLIB_NODE_FN (nat64_in2out_node) (vlib_main_t * vm,
+				  vlib_node_runtime_t * node,
+				  vlib_frame_t * frame)
+{
+  return nat64_in2out_node_fn_inline (vm, node, frame, 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_in2out_node) = {
+  .name = "nat64-in2out",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nat64_in2out_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN (nat64_in2out_error_strings),
+  .error_strings = nat64_in2out_error_strings,
+  .n_next_nodes = NAT64_IN2OUT_N_NEXT,
+  /* edit / add dispositions here */
+  .next_nodes = {
+    [NAT64_IN2OUT_NEXT_DROP] = "error-drop",
+    [NAT64_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
+    [NAT64_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
+    [NAT64_IN2OUT_NEXT_SLOWPATH] = "nat64-in2out-slowpath",
+  },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FN (nat64_in2out_slowpath_node) (vlib_main_t * vm,
+					   vlib_node_runtime_t * node,
+					   vlib_frame_t * frame)
+{
+  return nat64_in2out_node_fn_inline (vm, node, frame, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_in2out_slowpath_node) = {
+  .name = "nat64-in2out-slowpath",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nat64_in2out_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN (nat64_in2out_error_strings),
+  .error_strings = nat64_in2out_error_strings,
+  .n_next_nodes = NAT64_IN2OUT_N_NEXT,
+  /* edit / add dispositions here */
+  .next_nodes = {
+    [NAT64_IN2OUT_NEXT_DROP] = "error-drop",
+    [NAT64_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
+    [NAT64_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
+    [NAT64_IN2OUT_NEXT_SLOWPATH] = "nat64-in2out-slowpath",
+  },
+};
+/* *INDENT-ON* */
+
+typedef struct nat64_in2out_frag_set_ctx_t_
+{
+  vlib_main_t *vm;
+  u32 sess_index;
+  u32 thread_index;
+  u16 l4_offset;
+  u8 proto;
+  u8 first_frag;
+} nat64_in2out_frag_set_ctx_t;
+
+
+#define foreach_nat64_in2out_handoff_error                       \
+_(CONGESTION_DROP, "congestion drop")                            \
+_(SAME_WORKER, "same worker")                                    \
+_(DO_HANDOFF, "do handoff")
+
+typedef enum
+{
+#define _(sym,str) NAT64_IN2OUT_HANDOFF_ERROR_##sym,
+  foreach_nat64_in2out_handoff_error
+#undef _
+    NAT64_IN2OUT_HANDOFF_N_ERROR,
+} nat64_in2out_handoff_error_t;
+
+static char *nat64_in2out_handoff_error_strings[] = {
+#define _(sym,string) string,
+  foreach_nat64_in2out_handoff_error
+#undef _
+};
+
+typedef struct
+{
+  u32 next_worker_index;
+} nat64_in2out_handoff_trace_t;
+
+static u8 *
+format_nat64_in2out_handoff_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 *);
+  nat64_in2out_handoff_trace_t *t =
+    va_arg (*args, nat64_in2out_handoff_trace_t *);
+
+  s =
+    format (s, "NAT64-IN2OUT-HANDOFF: next-worker %d", t->next_worker_index);
+
+  return s;
+}
+
+VLIB_NODE_FN (nat64_in2out_handoff_node) (vlib_main_t * vm,
+					  vlib_node_runtime_t * node,
+					  vlib_frame_t * frame)
+{
+  nat64_main_t *nm = &nat64_main;
+  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+  u32 n_enq, n_left_from, *from;
+  u16 thread_indices[VLIB_FRAME_SIZE], *ti;
+  u32 fq_index;
+  u32 thread_index = vm->thread_index;
+  u32 do_handoff = 0, same_worker = 0;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  vlib_get_buffers (vm, from, bufs, n_left_from);
+
+  b = bufs;
+  ti = thread_indices;
+
+  fq_index = nm->fq_in2out_index;
+
+  while (n_left_from > 0)
+    {
+      ip6_header_t *ip0;
+
+      ip0 = vlib_buffer_get_current (b[0]);
+      ti[0] = nat64_get_worker_in2out (&ip0->src_address);
+
+      if (ti[0] != thread_index)
+	do_handoff++;
+      else
+	same_worker++;
+
+      if (PREDICT_FALSE
+	  ((node->flags & VLIB_NODE_FLAG_TRACE)
+	   && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
+	{
+	  nat64_in2out_handoff_trace_t *t =
+	    vlib_add_trace (vm, node, b[0], sizeof (*t));
+	  t->next_worker_index = ti[0];
+	}
+
+      n_left_from -= 1;
+      ti += 1;
+      b += 1;
+    }
+
+  n_enq =
+    vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
+				   frame->n_vectors, 1);
+
+  if (n_enq < frame->n_vectors)
+    vlib_node_increment_counter (vm, node->node_index,
+				 NAT64_IN2OUT_HANDOFF_ERROR_CONGESTION_DROP,
+				 frame->n_vectors - n_enq);
+  vlib_node_increment_counter (vm, node->node_index,
+			       NAT64_IN2OUT_HANDOFF_ERROR_SAME_WORKER,
+			       same_worker);
+  vlib_node_increment_counter (vm, node->node_index,
+			       NAT64_IN2OUT_HANDOFF_ERROR_DO_HANDOFF,
+			       do_handoff);
+
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_in2out_handoff_node) = {
+  .name = "nat64-in2out-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nat64_in2out_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(nat64_in2out_handoff_error_strings),
+  .error_strings = nat64_in2out_handoff_error_strings,
+
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/nat/nat64/nat64_out2in.c b/src/plugins/nat/nat64/nat64_out2in.c
new file mode 100644
index 00000000000..108edf0bdd1
--- /dev/null
+++ b/src/plugins/nat/nat64/nat64_out2in.c
@@ -0,0 +1,796 @@
+/*
+ * Copyright (c) 2020 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 <nat/nat64/nat64.h>
+#include <vnet/ip/ip4_to_ip6.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/udp/udp.h>
+
+typedef struct
+{
+  u32 sw_if_index;
+  u32 next_index;
+} nat64_out2in_trace_t;
+
+static u8 *
+format_nat64_out2in_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 *);
+  nat64_out2in_trace_t *t = va_arg (*args, nat64_out2in_trace_t *);
+
+  s =
+    format (s, "NAT64-out2in: sw_if_index %d, next index %d", t->sw_if_index,
+	    t->next_index);
+
+  return s;
+}
+
+#define foreach_nat64_out2in_error                       \
+_(UNSUPPORTED_PROTOCOL, "unsupported protocol")          \
+_(NO_TRANSLATION, "no translation")                      \
+_(UNKNOWN, "unknown")
+
+typedef enum
+{
+#define _(sym,str) NAT64_OUT2IN_ERROR_##sym,
+  foreach_nat64_out2in_error
+#undef _
+    NAT64_OUT2IN_N_ERROR,
+} nat64_out2in_error_t;
+
+static char *nat64_out2in_error_strings[] = {
+#define _(sym,string) string,
+  foreach_nat64_out2in_error
+#undef _
+};
+
+typedef enum
+{
+  NAT64_OUT2IN_NEXT_IP6_LOOKUP,
+  NAT64_OUT2IN_NEXT_IP4_LOOKUP,
+  NAT64_OUT2IN_NEXT_DROP,
+  NAT64_OUT2IN_N_NEXT,
+} nat64_out2in_next_t;
+
+typedef struct nat64_out2in_set_ctx_t_
+{
+  vlib_buffer_t *b;
+  vlib_main_t *vm;
+  u32 thread_index;
+} nat64_out2in_set_ctx_t;
+
+static int
+nat64_out2in_tcp_udp (vlib_main_t * vm, vlib_buffer_t * b,
+		      nat64_out2in_set_ctx_t * ctx)
+{
+  ip4_header_t *ip4;
+  ip6_header_t *ip6;
+  ip_csum_t csum;
+  u16 *checksum = NULL;
+  ip6_frag_hdr_t *frag;
+  u32 frag_id;
+  ip4_address_t old_src, old_dst;
+
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  ip46_address_t saddr;
+  ip46_address_t daddr;
+  ip6_address_t ip6_saddr;
+  u8 proto = vnet_buffer (b)->ip.reass.ip_proto;
+  u16 dport = vnet_buffer (b)->ip.reass.l4_dst_port;
+  u16 sport = vnet_buffer (b)->ip.reass.l4_src_port;
+  u32 sw_if_index, fib_index;
+  nat64_db_t *db = &nm->db[ctx->thread_index];
+
+  ip4 = vlib_buffer_get_current (b);
+
+  udp_header_t *udp = ip4_next_header (ip4);
+  tcp_header_t *tcp = ip4_next_header (ip4);
+  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
+    {
+      if (ip4->protocol == IP_PROTOCOL_UDP)
+	{
+	  checksum = &udp->checksum;
+	  //UDP checksum is optional over IPv4 but mandatory for IPv6
+	  //We do not check udp->length sanity but use our safe computed value instead
+	  if (PREDICT_FALSE (!*checksum))
+	    {
+	      u16 udp_len =
+		clib_host_to_net_u16 (ip4->length) - sizeof (*ip4);
+	      csum = ip_incremental_checksum (0, udp, udp_len);
+	      csum =
+		ip_csum_with_carry (csum, clib_host_to_net_u16 (udp_len));
+	      csum =
+		ip_csum_with_carry (csum,
+				    clib_host_to_net_u16 (IP_PROTOCOL_UDP));
+	      csum =
+		ip_csum_with_carry (csum, *((u64 *) (&ip4->src_address)));
+	      *checksum = ~ip_csum_fold (csum);
+	    }
+	}
+      else
+	{
+	  checksum = &tcp->checksum;
+	}
+    }
+
+  old_src.as_u32 = ip4->src_address.as_u32;
+  old_dst.as_u32 = ip4->dst_address.as_u32;
+
+  // Deal with fragmented packets
+  u16 frag_offset = ip4_get_fragment_offset (ip4);
+  if (PREDICT_FALSE (ip4_get_fragment_more (ip4) || frag_offset))
+    {
+      ip6 =
+	(ip6_header_t *) u8_ptr_add (ip4,
+				     sizeof (*ip4) - sizeof (*ip6) -
+				     sizeof (*frag));
+      frag =
+	(ip6_frag_hdr_t *) u8_ptr_add (ip4, sizeof (*ip4) - sizeof (*frag));
+      frag_id = frag_id_4to6 (ip4->fragment_id);
+      vlib_buffer_advance (b, sizeof (*ip4) - sizeof (*ip6) - sizeof (*frag));
+    }
+  else
+    {
+      ip6 = (ip6_header_t *) (((u8 *) ip4) + sizeof (*ip4) - sizeof (*ip6));
+      vlib_buffer_advance (b, sizeof (*ip4) - sizeof (*ip6));
+      frag = NULL;
+    }
+
+  ip6->ip_version_traffic_class_and_flow_label =
+    clib_host_to_net_u32 ((6 << 28) + (ip4->tos << 20));
+  ip6->payload_length = u16_net_add (ip4->length, -sizeof (*ip4));
+  ip6->hop_limit = ip4->ttl;
+  ip6->protocol = ip4->protocol;
+
+  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+  fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
+
+  clib_memset (&saddr, 0, sizeof (saddr));
+  saddr.ip4.as_u32 = ip4->src_address.as_u32;
+  clib_memset (&daddr, 0, sizeof (daddr));
+  daddr.ip4.as_u32 = ip4->dst_address.as_u32;
+
+  ste =
+    nat64_db_st_entry_find (db, &daddr, &saddr, dport, sport, proto,
+			    fib_index, 0);
+  if (ste)
+    {
+      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+    }
+  else
+    {
+      bibe = nat64_db_bib_entry_find (db, &daddr, dport, proto, fib_index, 0);
+
+      if (!bibe)
+	return -1;
+
+      nat64_compose_ip6 (&ip6_saddr, &old_src, bibe->fib_index);
+      ste =
+	nat64_db_st_entry_create (ctx->thread_index, db, bibe, &ip6_saddr,
+				  &saddr.ip4, sport);
+
+      if (!ste)
+	return -1;
+
+      vlib_set_simple_counter (&nm->total_sessions, ctx->thread_index, 0,
+			       db->st.st_entries_num);
+    }
+
+  ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
+  ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[1];
+
+  ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+  ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+
+  vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+
+  nat64_session_reset_timeout (ste, ctx->vm);
+
+  if (PREDICT_FALSE (frag != NULL))
+    {
+      frag->next_hdr = ip6->protocol;
+      frag->identification = frag_id;
+      frag->rsv = 0;
+      frag->fragment_offset_and_more =
+	ip6_frag_hdr_offset_and_more (frag_offset, 1);
+      ip6->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION;
+      ip6->payload_length = u16_net_add (ip6->payload_length, sizeof (*frag));
+    }
+
+  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
+    {
+      udp->dst_port = bibe->in_port;
+
+      if (proto == IP_PROTOCOL_TCP)
+	{
+	  nat64_tcp_session_set_state (ste, tcp, 0);
+	}
+
+      csum = ip_csum_sub_even (*checksum, dport);
+      csum = ip_csum_add_even (csum, udp->dst_port);
+      csum = ip_csum_sub_even (csum, old_src.as_u32);
+      csum = ip_csum_sub_even (csum, old_dst.as_u32);
+      csum = ip_csum_add_even (csum, ip6->src_address.as_u64[0]);
+      csum = ip_csum_add_even (csum, ip6->src_address.as_u64[1]);
+      csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[0]);
+      csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[1]);
+      *checksum = ip_csum_fold (csum);
+    }
+
+  return 0;
+}
+
+static int
+nat64_out2in_icmp_set_cb (vlib_buffer_t * b, ip4_header_t * ip4,
+			  ip6_header_t * ip6, void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_out2in_set_ctx_t *ctx = arg;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  ip46_address_t saddr, daddr;
+  ip6_address_t ip6_saddr;
+  u32 sw_if_index, fib_index;
+  icmp46_header_t *icmp = ip4_next_header (ip4);
+  nat64_db_t *db = &nm->db[ctx->thread_index];
+
+  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+  fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
+
+  clib_memset (&saddr, 0, sizeof (saddr));
+  saddr.ip4.as_u32 = ip4->src_address.as_u32;
+  clib_memset (&daddr, 0, sizeof (daddr));
+  daddr.ip4.as_u32 = ip4->dst_address.as_u32;
+
+  if (icmp->type == ICMP6_echo_request || icmp->type == ICMP6_echo_reply)
+    {
+      u16 out_id = ((u16 *) (icmp))[2];
+      ste =
+	nat64_db_st_entry_find (db, &daddr, &saddr, out_id, 0,
+				IP_PROTOCOL_ICMP, fib_index, 0);
+
+      if (ste)
+	{
+	  bibe =
+	    nat64_db_bib_entry_by_index (db, IP_PROTOCOL_ICMP,
+					 ste->bibe_index);
+	  if (!bibe)
+	    return -1;
+	}
+      else
+	{
+	  bibe =
+	    nat64_db_bib_entry_find (db, &daddr, out_id,
+				     IP_PROTOCOL_ICMP, fib_index, 0);
+	  if (!bibe)
+	    return -1;
+
+	  nat64_compose_ip6 (&ip6_saddr, &ip4->src_address, bibe->fib_index);
+	  ste =
+	    nat64_db_st_entry_create (ctx->thread_index, db,
+				      bibe, &ip6_saddr, &saddr.ip4, 0);
+
+	  if (!ste)
+	    return -1;
+
+	  vlib_set_simple_counter (&nm->total_sessions, ctx->thread_index, 0,
+				   db->st.st_entries_num);
+	}
+
+      nat64_session_reset_timeout (ste, ctx->vm);
+
+      ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
+      ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[1];
+
+      ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+      ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+      ((u16 *) (icmp))[2] = bibe->in_port;
+
+      vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+    }
+  else
+    {
+      ip6_header_t *inner_ip6 = (ip6_header_t *) u8_ptr_add (icmp, 8);
+
+      nat64_compose_ip6 (&ip6->src_address, &ip4->src_address,
+			 vnet_buffer (ctx->b)->sw_if_index[VLIB_TX]);
+      ip6->dst_address.as_u64[0] = inner_ip6->src_address.as_u64[0];
+      ip6->dst_address.as_u64[1] = inner_ip6->src_address.as_u64[1];
+    }
+
+  return 0;
+}
+
+static int
+nat64_out2in_inner_icmp_set_cb (vlib_buffer_t * b, ip4_header_t * ip4,
+				ip6_header_t * ip6, void *arg)
+{
+  nat64_main_t *nm = &nat64_main;
+  nat64_out2in_set_ctx_t *ctx = arg;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  ip46_address_t saddr, daddr;
+  u32 sw_if_index, fib_index;
+  u8 proto = ip4->protocol;
+  nat64_db_t *db = &nm->db[ctx->thread_index];
+
+  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+  fib_index =
+    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+  clib_memset (&saddr, 0, sizeof (saddr));
+  saddr.ip4.as_u32 = ip4->src_address.as_u32;
+  clib_memset (&daddr, 0, sizeof (daddr));
+  daddr.ip4.as_u32 = ip4->dst_address.as_u32;
+
+  if (proto == IP_PROTOCOL_ICMP6)
+    {
+      icmp46_header_t *icmp = ip4_next_header (ip4);
+      u16 out_id = ((u16 *) (icmp))[2];
+      proto = IP_PROTOCOL_ICMP;
+
+      if (!
+	  (icmp->type == ICMP6_echo_request
+	   || icmp->type == ICMP6_echo_reply))
+	return -1;
+
+      ste =
+	nat64_db_st_entry_find (db, &saddr, &daddr, out_id, 0, proto,
+				fib_index, 0);
+      if (!ste)
+	return -1;
+
+      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+
+      ip6->dst_address.as_u64[0] = ste->in_r_addr.as_u64[0];
+      ip6->dst_address.as_u64[1] = ste->in_r_addr.as_u64[1];
+      ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0];
+      ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1];
+      ((u16 *) (icmp))[2] = bibe->in_port;
+
+      vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+    }
+  else
+    {
+      udp_header_t *udp = ip4_next_header (ip4);
+      tcp_header_t *tcp = ip4_next_header (ip4);
+      u16 dport = udp->dst_port;
+      u16 sport = udp->src_port;
+      u16 *checksum;
+      ip_csum_t csum;
+
+      ste =
+	nat64_db_st_entry_find (db, &saddr, &daddr, sport, dport, proto,
+				fib_index, 0);
+      if (!ste)
+	return -1;
+
+      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+
+      nat64_compose_ip6 (&ip6->dst_address, &daddr.ip4, bibe->fib_index);
+      ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0];
+      ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1];
+      udp->src_port = bibe->in_port;
+
+      if (proto == IP_PROTOCOL_UDP)
+	checksum = &udp->checksum;
+      else
+	checksum = &tcp->checksum;
+      if (*checksum)
+	{
+	  csum = ip_csum_sub_even (*checksum, sport);
+	  csum = ip_csum_add_even (csum, udp->src_port);
+	  *checksum = ip_csum_fold (csum);
+	}
+
+      vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+    }
+
+  return 0;
+}
+
+static int
+nat64_out2in_unk_proto (vlib_main_t * vm, vlib_buffer_t * p,
+			nat64_out2in_set_ctx_t * ctx)
+{
+  ip4_header_t *ip4 = vlib_buffer_get_current (p);
+  ip6_header_t *ip6;
+  ip6_frag_hdr_t *frag;
+  u32 frag_id;
+
+  nat64_main_t *nm = &nat64_main;
+  nat64_db_bib_entry_t *bibe;
+  nat64_db_st_entry_t *ste;
+  ip46_address_t saddr, daddr;
+  ip6_address_t ip6_saddr;
+  u32 sw_if_index, fib_index;
+  u8 proto = ip4->protocol;
+  nat64_db_t *db = &nm->db[ctx->thread_index];
+
+  // Deal with fragmented packets
+  u16 frag_offset = ip4_get_fragment_offset (ip4);
+  if (PREDICT_FALSE (ip4_get_fragment_more (ip4) || frag_offset))
+    {
+      ip6 =
+	(ip6_header_t *) u8_ptr_add (ip4,
+				     sizeof (*ip4) - sizeof (*ip6) -
+				     sizeof (*frag));
+      frag =
+	(ip6_frag_hdr_t *) u8_ptr_add (ip4, sizeof (*ip4) - sizeof (*frag));
+      frag_id = frag_id_4to6 (ip4->fragment_id);
+      vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6) - sizeof (*frag));
+    }
+  else
+    {
+      ip6 = (ip6_header_t *) (((u8 *) ip4) + sizeof (*ip4) - sizeof (*ip6));
+      vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6));
+      frag = NULL;
+    }
+
+  ip6->ip_version_traffic_class_and_flow_label =
+    clib_host_to_net_u32 ((6 << 28) + (ip4->tos << 20));
+  ip6->payload_length = u16_net_add (ip4->length, -sizeof (*ip4));
+  ip6->hop_limit = ip4->ttl;
+  ip6->protocol = ip4->protocol;
+
+  if (PREDICT_FALSE (frag != NULL))
+    {
+      frag->next_hdr = ip6->protocol;
+      frag->identification = frag_id;
+      frag->rsv = 0;
+      frag->fragment_offset_and_more =
+	ip6_frag_hdr_offset_and_more (frag_offset, 1);
+      ip6->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION;
+      ip6->payload_length = u16_net_add (ip6->payload_length, sizeof (*frag));
+    }
+
+  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+  fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
+
+  clib_memset (&saddr, 0, sizeof (saddr));
+  saddr.ip4.as_u32 = ip4->src_address.as_u32;
+  clib_memset (&daddr, 0, sizeof (daddr));
+  daddr.ip4.as_u32 = ip4->dst_address.as_u32;
+
+  ste =
+    nat64_db_st_entry_find (db, &daddr, &saddr, 0, 0, proto, fib_index, 0);
+  if (ste)
+    {
+      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
+      if (!bibe)
+	return -1;
+    }
+  else
+    {
+      bibe = nat64_db_bib_entry_find (db, &daddr, 0, proto, fib_index, 0);
+
+      if (!bibe)
+	return -1;
+
+      nat64_compose_ip6 (&ip6_saddr, &ip4->src_address, bibe->fib_index);
+      ste = nat64_db_st_entry_create (ctx->thread_index, db,
+				      bibe, &ip6_saddr, &saddr.ip4, 0);
+
+      if (!ste)
+	return -1;
+
+      vlib_set_simple_counter (&nm->total_sessions, ctx->thread_index, 0,
+			       db->st.st_entries_num);
+    }
+
+  nat64_session_reset_timeout (ste, ctx->vm);
+
+  ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
+  ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[1];
+
+  ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+  ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+
+  vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+
+  return 0;
+}
+
+VLIB_NODE_FN (nat64_out2in_node) (vlib_main_t * vm,
+				  vlib_node_runtime_t * node,
+				  vlib_frame_t * frame)
+{
+  u32 n_left_from, *from, *to_next;
+  nat64_out2in_next_t next_index;
+  nat64_main_t *nm = &nat64_main;
+  u32 thread_index = vm->thread_index;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  u32 bi0;
+	  vlib_buffer_t *b0;
+	  u32 next0;
+	  ip4_header_t *ip40;
+	  u32 proto0;
+	  nat64_out2in_set_ctx_t ctx0;
+	  udp_header_t *udp0;
+	  u32 sw_if_index0;
+
+	  /* speculatively enqueue b0 to the current next frame */
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  ip40 = vlib_buffer_get_current (b0);
+
+	  ctx0.b = b0;
+	  ctx0.vm = vm;
+	  ctx0.thread_index = thread_index;
+
+	  next0 = NAT64_OUT2IN_NEXT_IP6_LOOKUP;
+
+	  proto0 = ip_proto_to_nat_proto (ip40->protocol);
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
+	    {
+	      if (nat64_out2in_unk_proto (vm, b0, &ctx0))
+		{
+		  next0 = NAT64_OUT2IN_NEXT_DROP;
+		  b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
+		}
+	      vlib_increment_simple_counter (&nm->counters.out2in.other,
+					     thread_index, sw_if_index0, 1);
+	      goto trace0;
+	    }
+
+	  if (proto0 == NAT_PROTOCOL_ICMP)
+	    {
+	      vlib_increment_simple_counter (&nm->counters.out2in.icmp,
+					     thread_index, sw_if_index0, 1);
+	      if (icmp_to_icmp6
+		  (b0, nat64_out2in_icmp_set_cb, &ctx0,
+		   nat64_out2in_inner_icmp_set_cb, &ctx0))
+		{
+		  next0 = NAT64_OUT2IN_NEXT_DROP;
+		  b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
+		  goto trace0;
+		}
+	    }
+	  else
+	    {
+	      if (proto0 == NAT_PROTOCOL_TCP)
+		vlib_increment_simple_counter (&nm->counters.out2in.tcp,
+					       thread_index, sw_if_index0, 1);
+	      else
+		vlib_increment_simple_counter (&nm->counters.out2in.udp,
+					       thread_index, sw_if_index0, 1);
+
+	      if (nat64_out2in_tcp_udp (vm, b0, &ctx0))
+		{
+		  udp0 = ip4_next_header (ip40);
+		  /*
+		   * Send DHCP packets to the ipv4 stack, or we won't
+		   * be able to use dhcp client on the outside interface
+		   */
+		  if ((proto0 == NAT_PROTOCOL_UDP)
+		      && (udp0->dst_port ==
+			  clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))
+		    {
+		      next0 = NAT64_OUT2IN_NEXT_IP4_LOOKUP;
+		      goto trace0;
+		    }
+		  next0 = NAT64_OUT2IN_NEXT_DROP;
+		  b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
+		  goto trace0;
+		}
+	    }
+
+	trace0:
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      nat64_out2in_trace_t *t =
+		vlib_add_trace (vm, node, b0, sizeof (*t));
+	      t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+	      t->next_index = next0;
+	    }
+
+	  if (next0 == NAT64_OUT2IN_NEXT_DROP)
+	    {
+	      vlib_increment_simple_counter (&nm->counters.out2in.drops,
+					     thread_index, sw_if_index0, 1);
+	    }
+
+	  /* verify speculative enqueue, maybe switch current next frame */
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+					   n_left_to_next, bi0, next0);
+	}
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_out2in_node) = {
+  .name = "nat64-out2in",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nat64_out2in_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN (nat64_out2in_error_strings),
+  .error_strings = nat64_out2in_error_strings,
+  .n_next_nodes = NAT64_OUT2IN_N_NEXT,
+  /* edit / add dispositions here */
+  .next_nodes = {
+    [NAT64_OUT2IN_NEXT_DROP] = "error-drop",
+    [NAT64_OUT2IN_NEXT_IP6_LOOKUP] = "ip6-lookup",
+    [NAT64_OUT2IN_NEXT_IP4_LOOKUP] = "ip4-lookup",
+  },
+};
+/* *INDENT-ON* */
+
+typedef struct nat64_out2in_frag_set_ctx_t_
+{
+  vlib_main_t *vm;
+  vlib_buffer_t *b;
+  u32 sess_index;
+  u32 thread_index;
+  u8 proto;
+  u8 first_frag;
+} nat64_out2in_frag_set_ctx_t;
+
+#define foreach_nat64_out2in_handoff_error                       \
+_(CONGESTION_DROP, "congestion drop")                            \
+_(SAME_WORKER, "same worker")                                    \
+_(DO_HANDOFF, "do handoff")
+
+typedef enum
+{
+#define _(sym,str) NAT64_OUT2IN_HANDOFF_ERROR_##sym,
+  foreach_nat64_out2in_handoff_error
+#undef _
+    NAT64_OUT2IN_HANDOFF_N_ERROR,
+} nat64_out2in_handoff_error_t;
+
+static char *nat64_out2in_handoff_error_strings[] = {
+#define _(sym,string) string,
+  foreach_nat64_out2in_handoff_error
+#undef _
+};
+
+typedef struct
+{
+  u32 next_worker_index;
+} nat64_out2in_handoff_trace_t;
+
+static u8 *
+format_nat64_out2in_handoff_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 *);
+  nat64_out2in_handoff_trace_t *t =
+    va_arg (*args, nat64_out2in_handoff_trace_t *);
+
+  s =
+    format (s, "NAT64-OUT2IN-HANDOFF: next-worker %d", t->next_worker_index);
+
+  return s;
+}
+
+VLIB_NODE_FN (nat64_out2in_handoff_node) (vlib_main_t * vm,
+					  vlib_node_runtime_t * node,
+					  vlib_frame_t * frame)
+{
+  nat64_main_t *nm = &nat64_main;
+  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+  u32 n_enq, n_left_from, *from;
+  u16 thread_indices[VLIB_FRAME_SIZE], *ti;
+  u32 fq_index;
+  u32 thread_index = vm->thread_index;
+  u32 do_handoff = 0, same_worker = 0;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  vlib_get_buffers (vm, from, bufs, n_left_from);
+
+  b = bufs;
+  ti = thread_indices;
+
+  fq_index = nm->fq_out2in_index;
+
+  while (n_left_from > 0)
+    {
+      ip4_header_t *ip0;
+
+      ip0 = vlib_buffer_get_current (b[0]);
+      ti[0] = nat64_get_worker_out2in (b[0], ip0);
+
+      if (ti[0] != thread_index)
+	do_handoff++;
+      else
+	same_worker++;
+
+      if (PREDICT_FALSE
+	  ((node->flags & VLIB_NODE_FLAG_TRACE)
+	   && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
+	{
+	  nat64_out2in_handoff_trace_t *t =
+	    vlib_add_trace (vm, node, b[0], sizeof (*t));
+	  t->next_worker_index = ti[0];
+	}
+
+      n_left_from -= 1;
+      ti += 1;
+      b += 1;
+    }
+
+  n_enq =
+    vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
+				   frame->n_vectors, 1);
+
+  if (n_enq < frame->n_vectors)
+    vlib_node_increment_counter (vm, node->node_index,
+				 NAT64_OUT2IN_HANDOFF_ERROR_CONGESTION_DROP,
+				 frame->n_vectors - n_enq);
+  vlib_node_increment_counter (vm, node->node_index,
+			       NAT64_OUT2IN_HANDOFF_ERROR_SAME_WORKER,
+			       same_worker);
+  vlib_node_increment_counter (vm, node->node_index,
+			       NAT64_OUT2IN_HANDOFF_ERROR_DO_HANDOFF,
+			       do_handoff);
+
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_out2in_handoff_node) = {
+  .name = "nat64-out2in-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nat64_out2in_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(nat64_out2in_handoff_error_strings),
+  .error_strings = nat64_out2in_handoff_error_strings,
+
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */