nat: Final NAT44 EI/ED split patch

This patch achieves complete separation of
endpoint-dependent and endpoint-independent IPv4 NAT
features. Some common stuff is also moved to NAT
library.

Type: refactor

Change-Id: I52468b7e2b5ac28958a2baf8e2ea01787322e801
Signed-off-by: Filip Varga <fivarga@cisco.com>

1 files changed, 1541 insertions, 0 deletions

diff --git a/src/plugins/nat/nat44-ed/nat44_ed_api.c b/src/plugins/nat/nat44-ed/nat44_ed_api.c
new file mode 100644
index 00000000000..ea812da9633
--- /dev/null
+++ b/src/plugins/nat/nat44-ed/nat44_ed_api.c
@@ -0,0 +1,1541 @@
+/*
+ * 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.
+ */
+/**
+ * @file
+ * @brief NAT44 plugin API implementation
+ */
+
+#include <vnet/ip/ip_types_api.h>
+#include <vlibmemory/api.h>
+
+#include <vnet/fib/fib_table.h>
+
+#include <nat/lib/nat_inlines.h>
+#include <nat/lib/ipfix_logging.h>
+
+#include <nat/nat44-ed/nat44_ed.h>
+
+#include <nat/nat44-ed/nat44_ed.api_enum.h>
+#include <nat/nat44-ed/nat44_ed.api_types.h>
+
+#define REPLY_MSG_ID_BASE sm->msg_id_base
+#include <vlibapi/api_helper_macros.h>
+
+static void
+vl_api_nat_control_ping_t_handler (vl_api_nat_control_ping_t * mp)
+{
+  vl_api_nat_control_ping_reply_t *rmp;
+  snat_main_t *sm = &snat_main;
+  int rv = 0;
+
+  REPLY_MACRO2 (VL_API_NAT_CONTROL_PING_REPLY,
+  ({
+    rmp->vpe_pid = ntohl (getpid ());
+  }));
+}
+
+static void
+vl_api_nat_show_config_t_handler (vl_api_nat_show_config_t * mp)
+{
+  vl_api_nat_show_config_reply_t *rmp;
+  snat_main_t *sm = &snat_main;
+  int rv = 0;
+
+  REPLY_MACRO2_ZERO (VL_API_NAT_SHOW_CONFIG_REPLY,
+  ({
+    rmp->translation_buckets = htonl (sm->translation_buckets);
+    rmp->user_buckets = 0;
+    rmp->max_translations_per_user = 0;
+    rmp->outside_vrf_id = htonl (sm->outside_vrf_id);
+    rmp->inside_vrf_id = htonl (sm->inside_vrf_id);
+    rmp->static_mapping_only = sm->static_mapping_only;
+    rmp->static_mapping_connection_tracking =
+      sm->static_mapping_connection_tracking;
+    rmp->endpoint_dependent = 1;
+    rmp->out2in_dpo = 0;
+  }));
+}
+
+static void
+vl_api_nat_show_config_2_t_handler (vl_api_nat_show_config_2_t * mp)
+{
+  vl_api_nat_show_config_2_reply_t *rmp;
+  snat_main_t *sm = &snat_main;
+  int rv = 0;
+
+  REPLY_MACRO2_ZERO (VL_API_NAT_SHOW_CONFIG_2_REPLY,
+  ({
+    rmp->translation_buckets = htonl (sm->translation_buckets);
+    rmp->user_buckets = 0;
+    rmp->max_translations_per_user = 0;
+    rmp->outside_vrf_id = htonl (sm->outside_vrf_id);
+    rmp->inside_vrf_id = htonl (sm->inside_vrf_id);
+    rmp->static_mapping_only = sm->static_mapping_only;
+    rmp->static_mapping_connection_tracking =
+      sm->static_mapping_connection_tracking;
+    rmp->endpoint_dependent = 1;
+    rmp->out2in_dpo = 0;
+    rmp->max_translations_per_thread =
+      clib_net_to_host_u32 (sm->max_translations_per_thread);
+    rmp->max_users_per_thread = 0;
+  }));
+}
+
+static void
+vl_api_nat44_show_running_config_t_handler (vl_api_nat44_show_running_config_t
+					    * mp)
+{
+  vl_api_nat44_show_running_config_reply_t *rmp;
+  snat_main_t *sm = &snat_main;
+  nat44_config_t *rc = &sm->rconfig;
+  int rv = 0;
+
+  REPLY_MACRO2_ZERO (VL_API_NAT44_SHOW_RUNNING_CONFIG_REPLY,
+  ({
+    rmp->inside_vrf = htonl (rc->inside_vrf);
+    rmp->outside_vrf = htonl (rc->outside_vrf);
+
+    rmp->sessions = htonl (rc->sessions);
+    rmp->translation_buckets = htonl (sm->translation_buckets);
+
+    // OBSOLETE
+    rmp->users = 0;
+    rmp->user_buckets = 0;
+    rmp->user_sessions = 0;
+
+    rmp->timeouts.udp = htonl (sm->timeouts.udp);
+    rmp->timeouts.tcp_established = htonl (sm->timeouts.tcp.established);
+    rmp->timeouts.tcp_transitory = htonl (sm->timeouts.tcp.transitory);
+    rmp->timeouts.icmp = htonl (sm->timeouts.icmp);
+
+    rmp->forwarding_enabled = sm->forwarding_enabled == 1;
+    // consider how to split functionality between subplugins
+    rmp->ipfix_logging_enabled = nat_ipfix_logging_enabled ();
+    rmp->flags |= NAT44_IS_ENDPOINT_DEPENDENT;
+    if (rc->static_mapping_only)
+      rmp->flags |= NAT44_IS_STATIC_MAPPING_ONLY;
+    if (rc->connection_tracking)
+      rmp->flags |= NAT44_IS_CONNECTION_TRACKING;
+  }));
+}
+
+static void
+vl_api_nat_set_workers_t_handler (vl_api_nat_set_workers_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_set_workers_reply_t *rmp;
+  int rv = 0;
+  uword *bitmap = 0;
+  u64 mask;
+
+  mask = clib_net_to_host_u64 (mp->worker_mask);
+
+  if (sm->num_workers < 2)
+    {
+      rv = VNET_API_ERROR_FEATURE_DISABLED;
+      goto send_reply;
+    }
+
+  bitmap = clib_bitmap_set_multiple (bitmap, 0, mask, BITS (mask));
+  rv = snat_set_workers (bitmap);
+  clib_bitmap_free (bitmap);
+
+send_reply:
+  REPLY_MACRO (VL_API_NAT_SET_WORKERS_REPLY);
+}
+
+static void
+send_nat_worker_details (u32 worker_index, vl_api_registration_t * reg,
+			 u32 context)
+{
+  vl_api_nat_worker_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+  vlib_worker_thread_t *w =
+    vlib_worker_threads + worker_index + sm->first_worker_index;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_NAT_WORKER_DETAILS + sm->msg_id_base);
+  rmp->context = context;
+  rmp->worker_index = htonl (worker_index);
+  rmp->lcore_id = htonl (w->cpu_id);
+  strncpy ((char *) rmp->name, (char *) w->name, ARRAY_LEN (rmp->name) - 1);
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+vl_api_nat_worker_dump_t_handler (vl_api_nat_worker_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  u32 *worker_index;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  vec_foreach (worker_index, sm->workers)
+    {
+      send_nat_worker_details (*worker_index, reg, mp->context);
+    }
+}
+
+static void
+vl_api_nat44_session_cleanup_t_handler (vl_api_nat44_session_cleanup_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_session_cleanup_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT44_SESSION_CLEANUP_REPLY);
+}
+
+static void
+vl_api_nat44_set_session_limit_t_handler (vl_api_nat44_set_session_limit_t *
+					  mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_set_session_limit_reply_t *rmp;
+  int rv = 0;
+
+  rv = nat44_set_session_limit
+    (ntohl (mp->session_limit), ntohl (mp->vrf_id));
+
+  REPLY_MACRO (VL_API_NAT44_SET_SESSION_LIMIT_REPLY);
+}
+
+static void
+vl_api_nat_set_log_level_t_handler (vl_api_nat_set_log_level_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_set_log_level_reply_t *rmp;
+  int rv = 0;
+
+  if (sm->log_level > NAT_LOG_DEBUG)
+    rv = VNET_API_ERROR_UNSUPPORTED;
+  else
+    sm->log_level = mp->log_level;
+
+  REPLY_MACRO (VL_API_NAT_SET_WORKERS_REPLY);
+}
+
+static void
+  vl_api_nat44_plugin_enable_disable_t_handler
+  (vl_api_nat44_plugin_enable_disable_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  nat44_config_t c = { 0 };
+  vl_api_nat44_plugin_enable_disable_reply_t *rmp;
+  int rv = 0;
+
+  if (mp->enable)
+    {
+      if (mp->flags & NAT44_API_IS_OUT2IN_DPO || mp->users ||
+	  mp->user_sessions)
+	{
+	  rv = VNET_API_ERROR_UNSUPPORTED;
+	}
+      else
+	{
+	  c.static_mapping_only = mp->flags & NAT44_API_IS_STATIC_MAPPING_ONLY;
+	  c.connection_tracking = mp->flags & NAT44_API_IS_CONNECTION_TRACKING;
+
+	  c.inside_vrf = ntohl (mp->inside_vrf);
+	  c.outside_vrf = ntohl (mp->outside_vrf);
+
+	  c.sessions = ntohl (mp->sessions);
+
+	  rv = nat44_plugin_enable (c);
+	}
+    }
+  else
+    {
+      rv = nat44_plugin_disable ();
+    }
+
+  REPLY_MACRO (VL_API_NAT44_PLUGIN_ENABLE_DISABLE_REPLY);
+}
+
+static void
+vl_api_nat_ipfix_enable_disable_t_handler (vl_api_nat_ipfix_enable_disable_t *
+					   mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_ipfix_enable_disable_reply_t *rmp;
+  int rv = 0;
+
+  rv = nat_ipfix_logging_enable_disable (mp->enable,
+					 clib_host_to_net_u32
+					 (mp->domain_id),
+					 clib_host_to_net_u16 (mp->src_port));
+
+  REPLY_MACRO (VL_API_NAT_IPFIX_ENABLE_DISABLE_REPLY);
+}
+
+static void
+vl_api_nat_set_timeouts_t_handler (vl_api_nat_set_timeouts_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_set_timeouts_reply_t *rmp;
+  int rv = 0;
+
+  sm->timeouts.udp = ntohl (mp->udp);
+  sm->timeouts.tcp.established = ntohl (mp->tcp_established);
+  sm->timeouts.tcp.transitory = ntohl (mp->tcp_transitory);
+  sm->timeouts.icmp = ntohl (mp->icmp);
+
+  REPLY_MACRO (VL_API_NAT_SET_TIMEOUTS_REPLY);
+}
+
+static void
+vl_api_nat_get_timeouts_t_handler (vl_api_nat_get_timeouts_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_get_timeouts_reply_t *rmp;
+  int rv = 0;
+
+  REPLY_MACRO2 (VL_API_NAT_GET_TIMEOUTS_REPLY,
+  ({
+    rmp->udp = htonl (sm->timeouts.udp);
+    rmp->tcp_established = htonl (sm->timeouts.tcp.established);
+    rmp->tcp_transitory = htonl (sm->timeouts.tcp.transitory);
+    rmp->icmp = htonl (sm->timeouts.icmp);
+  }))
+}
+
+static void
+  vl_api_nat_set_addr_and_port_alloc_alg_t_handler
+  (vl_api_nat_set_addr_and_port_alloc_alg_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_set_addr_and_port_alloc_alg_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT_SET_ADDR_AND_PORT_ALLOC_ALG_REPLY);
+}
+
+static void
+  vl_api_nat_get_addr_and_port_alloc_alg_t_handler
+  (vl_api_nat_get_addr_and_port_alloc_alg_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_get_addr_and_port_alloc_alg_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT_GET_ADDR_AND_PORT_ALLOC_ALG_REPLY);
+}
+
+static void
+vl_api_nat_set_mss_clamping_t_handler (vl_api_nat_set_mss_clamping_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_set_mss_clamping_reply_t *rmp;
+  int rv = 0;
+
+  if (mp->enable)
+    sm->mss_clamping = ntohs (mp->mss_value);
+  else
+    sm->mss_clamping = 0;
+
+  REPLY_MACRO (VL_API_NAT_SET_MSS_CLAMPING_REPLY);
+}
+
+static void
+vl_api_nat_get_mss_clamping_t_handler (vl_api_nat_get_mss_clamping_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_get_mss_clamping_reply_t *rmp;
+  int rv = 0;
+
+  REPLY_MACRO2 (VL_API_NAT_GET_MSS_CLAMPING_REPLY,
+  ({
+    rmp->enable = sm->mss_clamping ? 1 : 0;
+    rmp->mss_value = htons (sm->mss_clamping);
+  }))
+}
+
+static void
+vl_api_nat_ha_set_listener_t_handler (vl_api_nat_ha_set_listener_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_ha_set_listener_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT_HA_SET_LISTENER_REPLY);
+}
+
+static void
+vl_api_nat_ha_get_listener_t_handler (vl_api_nat_ha_get_listener_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_ha_get_listener_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT_HA_GET_LISTENER_REPLY);
+}
+
+static void
+vl_api_nat_ha_set_failover_t_handler (vl_api_nat_ha_set_failover_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_ha_set_failover_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT_HA_SET_FAILOVER_REPLY);
+}
+
+static void
+vl_api_nat_ha_get_failover_t_handler (vl_api_nat_ha_get_failover_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_ha_get_failover_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT_HA_GET_FAILOVER_REPLY);
+}
+
+static void
+vl_api_nat_ha_flush_t_handler (vl_api_nat_ha_flush_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_ha_flush_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT_HA_FLUSH_REPLY);
+}
+
+static void
+vl_api_nat_ha_resync_t_handler (vl_api_nat_ha_resync_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat_ha_resync_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT_HA_RESYNC_REPLY);
+}
+
+static void
+vl_api_nat44_del_user_t_handler (vl_api_nat44_del_user_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_del_user_reply_t *rmp;
+  int rv = VNET_API_ERROR_UNSUPPORTED;
+  REPLY_MACRO (VL_API_NAT44_DEL_USER_REPLY);
+}
+
+static void
+  vl_api_nat44_add_del_address_range_t_handler
+  (vl_api_nat44_add_del_address_range_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_add_del_address_range_reply_t *rmp;
+  ip4_address_t this_addr;
+  u8 is_add, twice_nat;
+  u32 start_host_order, end_host_order;
+  u32 vrf_id;
+  int i, count;
+  int rv = 0;
+  u32 *tmp;
+
+  if (sm->static_mapping_only)
+    {
+      rv = VNET_API_ERROR_FEATURE_DISABLED;
+      goto send_reply;
+    }
+
+  is_add = mp->is_add;
+  twice_nat = mp->flags & NAT_API_IS_TWICE_NAT;
+
+  tmp = (u32 *) mp->first_ip_address;
+  start_host_order = clib_host_to_net_u32 (tmp[0]);
+  tmp = (u32 *) mp->last_ip_address;
+  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);
+
+  if (count > 1024)
+    nat_log_info ("%U - %U, %d addresses...",
+		  format_ip4_address, mp->first_ip_address,
+		  format_ip4_address, mp->last_ip_address, count);
+
+  memcpy (&this_addr.as_u8, mp->first_ip_address, 4);
+
+  for (i = 0; i < count; i++)
+    {
+      if (is_add)
+	rv = snat_add_address (sm, &this_addr, vrf_id, twice_nat);
+      else
+	rv = snat_del_address (sm, this_addr, 0, twice_nat);
+
+      if (rv)
+	goto send_reply;
+
+      increment_v4_address (&this_addr);
+    }
+
+send_reply:
+  REPLY_MACRO (VL_API_NAT44_ADD_DEL_ADDRESS_RANGE_REPLY);
+}
+
+static void
+send_nat44_address_details (snat_address_t * a,
+			    vl_api_registration_t * reg, u32 context,
+			    u8 twice_nat)
+{
+  vl_api_nat44_address_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_NAT44_ADDRESS_DETAILS + sm->msg_id_base);
+  clib_memcpy (rmp->ip_address, &(a->addr), 4);
+  if (a->fib_index != ~0)
+    {
+      fib_table_t *fib = fib_table_get (a->fib_index, FIB_PROTOCOL_IP4);
+      rmp->vrf_id = ntohl (fib->ft_table_id);
+    }
+  else
+    rmp->vrf_id = ~0;
+  if (twice_nat)
+    rmp->flags |= NAT_API_IS_TWICE_NAT;
+  rmp->context = context;
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+vl_api_nat44_address_dump_t_handler (vl_api_nat44_address_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  snat_address_t *a;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  vec_foreach (a, sm->addresses)
+    send_nat44_address_details (a, reg, mp->context, 0);
+  vec_foreach (a, sm->twice_nat_addresses)
+    send_nat44_address_details (a, reg, mp->context, 1);
+}
+
+static void
+  vl_api_nat44_interface_add_del_feature_t_handler
+  (vl_api_nat44_interface_add_del_feature_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_interface_add_del_feature_reply_t *rmp;
+  u32 sw_if_index = ntohl (mp->sw_if_index);
+  u8 is_del;
+  int rv = 0;
+
+  is_del = !mp->is_add;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  rv =
+    snat_interface_add_del (sw_if_index, mp->flags & NAT_API_IS_INSIDE,
+			    is_del);
+
+  BAD_SW_IF_INDEX_LABEL;
+
+  REPLY_MACRO (VL_API_NAT44_INTERFACE_ADD_DEL_FEATURE_REPLY);
+}
+
+static void
+send_nat44_interface_details (snat_interface_t * i,
+			      vl_api_registration_t * reg, u32 context)
+{
+  vl_api_nat44_interface_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_NAT44_INTERFACE_DETAILS + sm->msg_id_base);
+  rmp->sw_if_index = ntohl (i->sw_if_index);
+
+  if (nat_interface_is_inside (i))
+    rmp->flags |= NAT_API_IS_INSIDE;
+  if (nat_interface_is_outside (i))
+    rmp->flags |= NAT_API_IS_OUTSIDE;
+
+  rmp->context = context;
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+vl_api_nat44_interface_dump_t_handler (vl_api_nat44_interface_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  snat_interface_t *i;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  pool_foreach (i, sm->interfaces)
+   {
+    send_nat44_interface_details(i, reg, mp->context);
+  }
+}
+
+static void
+  vl_api_nat44_interface_add_del_output_feature_t_handler
+  (vl_api_nat44_interface_add_del_output_feature_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_interface_add_del_output_feature_reply_t *rmp;
+  u32 sw_if_index = ntohl (mp->sw_if_index);
+  int rv = 0;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  rv = snat_interface_add_del_output_feature (sw_if_index,
+					      mp->flags & NAT_API_IS_INSIDE,
+					      !mp->is_add);
+
+  BAD_SW_IF_INDEX_LABEL;
+  REPLY_MACRO (VL_API_NAT44_INTERFACE_ADD_DEL_OUTPUT_FEATURE_REPLY);
+}
+
+static void
+send_nat44_interface_output_feature_details (snat_interface_t * i,
+					     vl_api_registration_t * reg,
+					     u32 context)
+{
+  vl_api_nat44_interface_output_feature_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id =
+    ntohs (VL_API_NAT44_INTERFACE_OUTPUT_FEATURE_DETAILS + sm->msg_id_base);
+  rmp->sw_if_index = ntohl (i->sw_if_index);
+  rmp->context = context;
+
+  if (nat_interface_is_inside (i))
+    rmp->flags |= NAT_API_IS_INSIDE;
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+  vl_api_nat44_interface_output_feature_dump_t_handler
+  (vl_api_nat44_interface_output_feature_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  snat_interface_t *i;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  pool_foreach (i, sm->output_feature_interfaces)
+   {
+     send_nat44_interface_output_feature_details (i, reg, mp->context);
+  }
+}
+
+static void
+  vl_api_nat44_add_del_static_mapping_t_handler
+  (vl_api_nat44_add_del_static_mapping_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_add_del_static_mapping_reply_t *rmp;
+  ip4_address_t local_addr, external_addr, pool_addr = { 0 };
+  u16 local_port = 0, external_port = 0;
+  u32 vrf_id, external_sw_if_index;
+  twice_nat_type_t twice_nat = TWICE_NAT_DISABLED;
+  int rv = 0;
+  nat_protocol_t proto;
+  u8 *tag = 0;
+
+  memcpy (&local_addr.as_u8, mp->local_ip_address, 4);
+  memcpy (&external_addr.as_u8, mp->external_ip_address, 4);
+
+  if (!(mp->flags & NAT_API_IS_ADDR_ONLY))
+    {
+      local_port = mp->local_port;
+      external_port = mp->external_port;
+    }
+
+  vrf_id = clib_net_to_host_u32 (mp->vrf_id);
+  external_sw_if_index = clib_net_to_host_u32 (mp->external_sw_if_index);
+  proto = ip_proto_to_nat_proto (mp->protocol);
+
+  if (mp->flags & NAT_API_IS_TWICE_NAT)
+    twice_nat = TWICE_NAT;
+  else if (mp->flags & NAT_API_IS_SELF_TWICE_NAT)
+    twice_nat = TWICE_NAT_SELF;
+  mp->tag[sizeof (mp->tag) - 1] = 0;
+  tag = format (0, "%s", mp->tag);
+  vec_terminate_c_string (tag);
+
+  rv = snat_add_static_mapping (
+    local_addr, external_addr, local_port, external_port, vrf_id,
+    mp->flags & NAT_API_IS_ADDR_ONLY, external_sw_if_index, proto, mp->is_add,
+    twice_nat, mp->flags & NAT_API_IS_OUT2IN_ONLY, tag, 0, pool_addr, 0);
+  vec_free (tag);
+
+  REPLY_MACRO (VL_API_NAT44_ADD_DEL_STATIC_MAPPING_REPLY);
+}
+
+static void
+  vl_api_nat44_add_del_static_mapping_v2_t_handler
+  (vl_api_nat44_add_del_static_mapping_v2_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_add_del_static_mapping_v2_reply_t *rmp;
+  ip4_address_t local_addr, external_addr, pool_addr;
+  u16 local_port = 0, external_port = 0;
+  u32 vrf_id, external_sw_if_index;
+  twice_nat_type_t twice_nat = TWICE_NAT_DISABLED;
+  int rv = 0;
+  nat_protocol_t proto;
+  u8 *tag = 0;
+
+  memcpy (&pool_addr.as_u8, mp->pool_ip_address, 4);
+  memcpy (&local_addr.as_u8, mp->local_ip_address, 4);
+  memcpy (&external_addr.as_u8, mp->external_ip_address, 4);
+
+  if (!(mp->flags & NAT_API_IS_ADDR_ONLY))
+    {
+      local_port = mp->local_port;
+      external_port = mp->external_port;
+    }
+
+  vrf_id = clib_net_to_host_u32 (mp->vrf_id);
+  external_sw_if_index = clib_net_to_host_u32 (mp->external_sw_if_index);
+  proto = ip_proto_to_nat_proto (mp->protocol);
+
+  if (mp->flags & NAT_API_IS_TWICE_NAT)
+    twice_nat = TWICE_NAT;
+  else if (mp->flags & NAT_API_IS_SELF_TWICE_NAT)
+    twice_nat = TWICE_NAT_SELF;
+  mp->tag[sizeof (mp->tag) - 1] = 0;
+  tag = format (0, "%s", mp->tag);
+  vec_terminate_c_string (tag);
+
+  rv = snat_add_static_mapping (local_addr, external_addr, local_port,
+				external_port, vrf_id,
+				mp->flags & NAT_API_IS_ADDR_ONLY,
+				external_sw_if_index, proto,
+				mp->is_add, twice_nat,
+				mp->flags & NAT_API_IS_OUT2IN_ONLY, tag, 0,
+				pool_addr, mp->match_pool);
+  vec_free (tag);
+
+  REPLY_MACRO (VL_API_NAT44_ADD_DEL_STATIC_MAPPING_V2_REPLY);
+}
+
+static void
+send_nat44_static_mapping_details (snat_static_mapping_t * m,
+				   vl_api_registration_t * reg, u32 context)
+{
+  vl_api_nat44_static_mapping_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+  u32 len = sizeof (*rmp);
+
+  rmp = vl_msg_api_alloc (len);
+  clib_memset (rmp, 0, len);
+  rmp->_vl_msg_id =
+    ntohs (VL_API_NAT44_STATIC_MAPPING_DETAILS + sm->msg_id_base);
+
+  clib_memcpy (rmp->local_ip_address, &(m->local_addr), 4);
+  clib_memcpy (rmp->external_ip_address, &(m->external_addr), 4);
+  rmp->external_sw_if_index = ~0;
+  rmp->vrf_id = htonl (m->vrf_id);
+  rmp->context = context;
+
+  if (m->twice_nat == TWICE_NAT)
+    rmp->flags |= NAT_API_IS_TWICE_NAT;
+  else if (m->twice_nat == TWICE_NAT_SELF)
+    rmp->flags |= NAT_API_IS_SELF_TWICE_NAT;
+
+  if (is_out2in_only_static_mapping (m))
+    rmp->flags |= NAT_API_IS_OUT2IN_ONLY;
+
+  if (is_addr_only_static_mapping (m))
+    {
+      rmp->flags |= NAT_API_IS_ADDR_ONLY;
+    }
+  else
+    {
+      rmp->protocol = nat_proto_to_ip_proto (m->proto);
+      rmp->external_port = m->external_port;
+      rmp->local_port = m->local_port;
+    }
+
+  if (m->tag)
+    strncpy ((char *) rmp->tag, (char *) m->tag, vec_len (m->tag));
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+send_nat44_static_map_resolve_details (snat_static_map_resolve_t * m,
+				       vl_api_registration_t * reg,
+				       u32 context)
+{
+  vl_api_nat44_static_mapping_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id =
+    ntohs (VL_API_NAT44_STATIC_MAPPING_DETAILS + sm->msg_id_base);
+  clib_memcpy (rmp->local_ip_address, &(m->l_addr), 4);
+  rmp->external_sw_if_index = htonl (m->sw_if_index);
+  rmp->vrf_id = htonl (m->vrf_id);
+  rmp->context = context;
+
+  if (m->twice_nat)
+    rmp->flags |= NAT_API_IS_TWICE_NAT;
+
+  if (m->addr_only)
+    {
+      rmp->flags |= NAT_API_IS_ADDR_ONLY;
+    }
+  else
+    {
+      rmp->protocol = nat_proto_to_ip_proto (m->proto);
+      rmp->external_port = m->e_port;
+      rmp->local_port = m->l_port;
+    }
+  if (m->tag)
+    strncpy ((char *) rmp->tag, (char *) m->tag, vec_len (m->tag));
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+vl_api_nat44_static_mapping_dump_t_handler (vl_api_nat44_static_mapping_dump_t
+					    * mp)
+{
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  snat_static_mapping_t *m;
+  snat_static_map_resolve_t *rp;
+  int j;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  pool_foreach (m, sm->static_mappings)
+   {
+      if (!is_identity_static_mapping(m) && !is_lb_static_mapping (m))
+        send_nat44_static_mapping_details (m, reg, mp->context);
+  }
+
+  for (j = 0; j < vec_len (sm->to_resolve); j++)
+    {
+      rp = sm->to_resolve + j;
+      if (!rp->identity_nat)
+	send_nat44_static_map_resolve_details (rp, reg, mp->context);
+    }
+}
+
+static void
+  vl_api_nat44_add_del_identity_mapping_t_handler
+  (vl_api_nat44_add_del_identity_mapping_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_add_del_identity_mapping_reply_t *rmp;
+  ip4_address_t addr, pool_addr = { 0 };
+  u16 port = 0;
+  u32 vrf_id, sw_if_index;
+  int rv = 0;
+  nat_protocol_t proto = NAT_PROTOCOL_OTHER;
+  u8 *tag = 0;
+
+  if (!(mp->flags & NAT_API_IS_ADDR_ONLY))
+    {
+      port = mp->port;
+      proto = ip_proto_to_nat_proto (mp->protocol);
+    }
+  vrf_id = clib_net_to_host_u32 (mp->vrf_id);
+  sw_if_index = clib_net_to_host_u32 (mp->sw_if_index);
+  if (sw_if_index != ~0)
+    addr.as_u32 = 0;
+  else
+    memcpy (&addr.as_u8, mp->ip_address, 4);
+  mp->tag[sizeof (mp->tag) - 1] = 0;
+  tag = format (0, "%s", mp->tag);
+  vec_terminate_c_string (tag);
+
+  rv =
+    snat_add_static_mapping (addr, addr, port, port, vrf_id,
+			     mp->flags & NAT_API_IS_ADDR_ONLY, sw_if_index,
+			     proto, mp->is_add, 0, 0, tag, 1, pool_addr, 0);
+  vec_free (tag);
+
+  REPLY_MACRO (VL_API_NAT44_ADD_DEL_IDENTITY_MAPPING_REPLY);
+}
+
+static void
+send_nat44_identity_mapping_details (snat_static_mapping_t * m, int index,
+				     vl_api_registration_t * reg, u32 context)
+{
+  vl_api_nat44_identity_mapping_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+  nat44_lb_addr_port_t *local = pool_elt_at_index (m->locals, index);
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id =
+    ntohs (VL_API_NAT44_IDENTITY_MAPPING_DETAILS + sm->msg_id_base);
+
+  if (is_addr_only_static_mapping (m))
+    rmp->flags |= NAT_API_IS_ADDR_ONLY;
+
+  clib_memcpy (rmp->ip_address, &(m->local_addr), 4);
+  rmp->port = m->local_port;
+  rmp->sw_if_index = ~0;
+  rmp->vrf_id = htonl (local->vrf_id);
+  rmp->protocol = nat_proto_to_ip_proto (m->proto);
+  rmp->context = context;
+  if (m->tag)
+    strncpy ((char *) rmp->tag, (char *) m->tag, vec_len (m->tag));
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+send_nat44_identity_map_resolve_details (snat_static_map_resolve_t * m,
+					 vl_api_registration_t * reg,
+					 u32 context)
+{
+  vl_api_nat44_identity_mapping_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id =
+    ntohs (VL_API_NAT44_IDENTITY_MAPPING_DETAILS + sm->msg_id_base);
+
+  if (m->addr_only)
+    rmp->flags = (vl_api_nat_config_flags_t) NAT_API_IS_ADDR_ONLY;
+
+  rmp->port = m->l_port;
+  rmp->sw_if_index = htonl (m->sw_if_index);
+  rmp->vrf_id = htonl (m->vrf_id);
+  rmp->protocol = nat_proto_to_ip_proto (m->proto);
+  rmp->context = context;
+  if (m->tag)
+    strncpy ((char *) rmp->tag, (char *) m->tag, vec_len (m->tag));
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+  vl_api_nat44_identity_mapping_dump_t_handler
+  (vl_api_nat44_identity_mapping_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  snat_static_mapping_t *m;
+  snat_static_map_resolve_t *rp;
+  int j;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  pool_foreach (m, sm->static_mappings)
+   {
+      if (is_identity_static_mapping(m) && !is_lb_static_mapping (m))
+        {
+          pool_foreach_index (j, m->locals)
+           {
+            send_nat44_identity_mapping_details (m, j, reg, mp->context);
+          }
+        }
+  }
+
+  for (j = 0; j < vec_len (sm->to_resolve); j++)
+    {
+      rp = sm->to_resolve + j;
+      if (rp->identity_nat)
+	send_nat44_identity_map_resolve_details (rp, reg, mp->context);
+    }
+}
+
+static void
+  vl_api_nat44_add_del_interface_addr_t_handler
+  (vl_api_nat44_add_del_interface_addr_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_add_del_interface_addr_reply_t *rmp;
+  u32 sw_if_index = ntohl (mp->sw_if_index);
+  int rv = 0;
+  u8 is_del;
+
+  if (sm->static_mapping_only)
+    {
+      rv = VNET_API_ERROR_FEATURE_DISABLED;
+      goto send_reply;
+    }
+
+  is_del = !mp->is_add;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  rv = snat_add_interface_address (sm, sw_if_index, is_del,
+				   mp->flags & NAT_API_IS_TWICE_NAT);
+
+  BAD_SW_IF_INDEX_LABEL;
+
+send_reply:
+  REPLY_MACRO (VL_API_NAT44_ADD_DEL_INTERFACE_ADDR_REPLY);
+}
+
+static void
+send_nat44_interface_addr_details (u32 sw_if_index,
+				   vl_api_registration_t * reg, u32 context,
+				   u8 twice_nat)
+{
+  vl_api_nat44_interface_addr_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id =
+    ntohs (VL_API_NAT44_INTERFACE_ADDR_DETAILS + sm->msg_id_base);
+  rmp->sw_if_index = ntohl (sw_if_index);
+
+  if (twice_nat)
+    rmp->flags = (vl_api_nat_config_flags_t) NAT_API_IS_TWICE_NAT;
+  rmp->context = context;
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+vl_api_nat44_interface_addr_dump_t_handler (vl_api_nat44_interface_addr_dump_t
+					    * mp)
+{
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  u32 *i;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  vec_foreach (i, sm->auto_add_sw_if_indices)
+    {
+      send_nat44_interface_addr_details (*i, reg, mp->context, 0);
+    }
+  vec_foreach (i, sm->auto_add_sw_if_indices_twice_nat)
+    {
+      send_nat44_interface_addr_details (*i, reg, mp->context, 1);
+    }
+}
+
+/* user (internal host) key */
+typedef struct
+{
+  union
+  {
+    struct
+    {
+      ip4_address_t addr;
+      u32 fib_index;
+    };
+    u64 as_u64;
+  };
+} snat_user_key_t;
+
+typedef struct
+{
+  ip4_address_t addr;
+  u32 fib_index;
+  u32 nsessions;
+  u32 nstaticsessions;
+} snat_user_t;
+
+typedef struct
+{
+  u32 user_buckets;
+  snat_user_t *users;
+  clib_bihash_8_8_t user_hash;
+} user_create_helper_t;
+
+static void
+send_nat44_user_details (snat_user_t * u, vl_api_registration_t * reg,
+			 u32 context)
+{
+  vl_api_nat44_user_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+  ip4_main_t *im = &ip4_main;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_NAT44_USER_DETAILS + sm->msg_id_base);
+
+  if (!pool_is_free_index (im->fibs, u->fib_index))
+    {
+      fib_table_t *fib = fib_table_get (u->fib_index, FIB_PROTOCOL_IP4);
+      rmp->vrf_id = ntohl (fib->ft_table_id);
+    }
+
+  clib_memcpy (rmp->ip_address, &(u->addr), 4);
+  rmp->nsessions = ntohl (u->nsessions);
+  rmp->nstaticsessions = ntohl (u->nstaticsessions);
+  rmp->context = context;
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+nat_ed_user_create_helper (user_create_helper_t *uch, snat_session_t *s)
+{
+  snat_user_key_t k;
+  k.addr = s->in2out.addr;
+  k.fib_index = s->in2out.fib_index;
+  clib_bihash_kv_8_8_t key, value;
+  key.key = k.as_u64;
+  snat_user_t *u;
+
+  if (clib_bihash_search_8_8 (&uch->user_hash, &key, &value))
+    {
+      pool_get (uch->users, u);
+      u->addr = k.addr;
+      u->fib_index = k.fib_index;
+      u->nsessions = 0;
+      u->nstaticsessions = 0;
+      key.value = u - uch->users;
+      clib_bihash_add_del_8_8 (&uch->user_hash, &key, 1);
+    }
+  else
+    {
+      u = pool_elt_at_index (uch->users, value.value);
+    }
+  if (snat_is_session_static (s))
+    {
+      ++u->nstaticsessions;
+    }
+  else
+    {
+      ++u->nsessions;
+    }
+}
+
+u8 *
+format_user_kvp (u8 *s, va_list *args)
+{
+  clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
+  snat_user_key_t k;
+  k.as_u64 = v->key;
+  s = format (s, "%U fib %d user-index %llu", format_ip4_address, &k.addr,
+	      k.fib_index, v->value);
+  return s;
+}
+
+static void
+nat_ed_users_create (snat_main_per_thread_data_t *tsm,
+		     user_create_helper_t *uch)
+{
+  snat_session_t *s;
+  clib_bihash_init_8_8 (&uch->user_hash, "users", uch->user_buckets, 0);
+  clib_bihash_set_kvp_format_fn_8_8 (&uch->user_hash, format_user_kvp);
+  pool_foreach (s, tsm->sessions)
+    {
+      nat_ed_user_create_helper (uch, s);
+    }
+}
+
+static void
+nat_ed_users_destroy (user_create_helper_t *uch)
+{
+  pool_free (uch->users);
+  clib_bihash_free_8_8 (&uch->user_hash);
+}
+
+static void
+vl_api_nat44_user_dump_t_handler (vl_api_nat44_user_dump_t * mp)
+{
+  user_create_helper_t uch;
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  snat_main_per_thread_data_t *tsm;
+  snat_user_t *u;
+
+  clib_memset (&uch, 0, sizeof (uch));
+
+  uch.user_buckets = nat_calc_bihash_buckets (1024);
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  vec_foreach (tsm, sm->per_thread_data)
+    {
+      nat_ed_users_create (tsm, &uch);
+      pool_foreach (u, uch.users)
+	{
+	  send_nat44_user_details (u, reg, mp->context);
+	}
+      nat_ed_users_destroy (&uch);
+    }
+}
+
+static void
+send_nat44_user_session_details (snat_session_t * s,
+				 vl_api_registration_t * reg, u32 context)
+{
+  vl_api_nat44_user_session_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id =
+    ntohs (VL_API_NAT44_USER_SESSION_DETAILS + sm->msg_id_base);
+  clib_memcpy (rmp->outside_ip_address, (&s->out2in.addr), 4);
+  clib_memcpy (rmp->inside_ip_address, (&s->in2out.addr), 4);
+
+  if (snat_is_session_static (s))
+    rmp->flags |= NAT_API_IS_STATIC;
+
+  if (is_twice_nat_session (s))
+    rmp->flags |= NAT_API_IS_TWICE_NAT;
+
+  if (is_ed_session (s) || is_fwd_bypass_session (s))
+    rmp->flags |= NAT_API_IS_EXT_HOST_VALID;
+
+  rmp->last_heard = clib_host_to_net_u64 ((u64) s->last_heard);
+  rmp->total_bytes = clib_host_to_net_u64 (s->total_bytes);
+  rmp->total_pkts = ntohl (s->total_pkts);
+  rmp->context = context;
+  if (snat_is_unk_proto_session (s))
+    {
+      rmp->outside_port = 0;
+      rmp->inside_port = 0;
+      rmp->protocol = ntohs (s->in2out.port);
+    }
+  else
+    {
+      rmp->outside_port = s->out2in.port;
+      rmp->inside_port = s->in2out.port;
+      rmp->protocol = ntohs (nat_proto_to_ip_proto (s->nat_proto));
+    }
+  if (is_ed_session (s) || is_fwd_bypass_session (s))
+    {
+      clib_memcpy (rmp->ext_host_address, &s->ext_host_addr, 4);
+      rmp->ext_host_port = s->ext_host_port;
+      if (is_twice_nat_session (s))
+	{
+	  clib_memcpy (rmp->ext_host_nat_address, &s->ext_host_nat_addr, 4);
+	  rmp->ext_host_nat_port = s->ext_host_nat_port;
+	}
+    }
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+vl_api_nat44_user_session_dump_t_handler (vl_api_nat44_user_session_dump_t *
+					  mp)
+{
+  snat_main_per_thread_data_t *tsm;
+  snat_main_t *sm = &snat_main;
+  vl_api_registration_t *reg;
+  snat_user_key_t ukey;
+  snat_session_t *s;
+  ip4_header_t ip;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  clib_memcpy (&ukey.addr, mp->ip_address, 4);
+  ip.src_address.as_u32 = ukey.addr.as_u32;
+  ukey.fib_index = fib_table_find (FIB_PROTOCOL_IP4, ntohl (mp->vrf_id));
+  if (sm->num_workers > 1)
+    tsm =
+      vec_elt_at_index (sm->per_thread_data,
+			sm->worker_in2out_cb (&ip, ukey.fib_index, 0));
+  else
+    tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
+
+      pool_foreach (s, tsm->sessions) {
+        if (s->in2out.addr.as_u32 == ukey.addr.as_u32)
+          {
+            send_nat44_user_session_details (s, reg, mp->context);
+          }
+      }
+}
+
+static nat44_lb_addr_port_t *
+unformat_nat44_lb_addr_port (vl_api_nat44_lb_addr_port_t * addr_port_pairs,
+			     u32 addr_port_pair_num)
+{
+  u8 i;
+  nat44_lb_addr_port_t *lb_addr_port_pairs = 0, lb_addr_port;
+  vl_api_nat44_lb_addr_port_t *ap;
+
+  for (i = 0; i < addr_port_pair_num; i++)
+    {
+      ap = &addr_port_pairs[i];
+      clib_memset (&lb_addr_port, 0, sizeof (lb_addr_port));
+      clib_memcpy (&lb_addr_port.addr, ap->addr, 4);
+      lb_addr_port.port = ap->port;
+      lb_addr_port.probability = ap->probability;
+      lb_addr_port.vrf_id = clib_net_to_host_u32 (ap->vrf_id);
+      vec_add1 (lb_addr_port_pairs, lb_addr_port);
+    }
+
+  return lb_addr_port_pairs;
+}
+
+static void
+  vl_api_nat44_add_del_lb_static_mapping_t_handler
+  (vl_api_nat44_add_del_lb_static_mapping_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_add_del_lb_static_mapping_reply_t *rmp;
+  twice_nat_type_t twice_nat = TWICE_NAT_DISABLED;
+  int rv = 0;
+  nat44_lb_addr_port_t *locals = 0;
+  ip4_address_t e_addr;
+  nat_protocol_t proto;
+  u8 *tag = 0;
+
+  locals =
+    unformat_nat44_lb_addr_port (mp->locals,
+				 clib_net_to_host_u32 (mp->local_num));
+  clib_memcpy (&e_addr, mp->external_addr, 4);
+  proto = ip_proto_to_nat_proto (mp->protocol);
+
+  if (mp->flags & NAT_API_IS_TWICE_NAT)
+    twice_nat = TWICE_NAT;
+  else if (mp->flags & NAT_API_IS_SELF_TWICE_NAT)
+    twice_nat = TWICE_NAT_SELF;
+  mp->tag[sizeof (mp->tag) - 1] = 0;
+  tag = format (0, "%s", mp->tag);
+  vec_terminate_c_string (tag);
+
+  rv =
+    nat44_add_del_lb_static_mapping (e_addr,
+				     mp->external_port,
+				     proto, locals, mp->is_add,
+				     twice_nat,
+				     mp->flags & NAT_API_IS_OUT2IN_ONLY, tag,
+				     clib_net_to_host_u32 (mp->affinity));
+
+  vec_free (locals);
+  vec_free (tag);
+  REPLY_MACRO (VL_API_NAT44_ADD_DEL_LB_STATIC_MAPPING_REPLY);
+}
+
+static void
+  vl_api_nat44_lb_static_mapping_add_del_local_t_handler
+  (vl_api_nat44_lb_static_mapping_add_del_local_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_lb_static_mapping_add_del_local_reply_t *rmp;
+  int rv = 0;
+  ip4_address_t e_addr, l_addr;
+  nat_protocol_t proto;
+
+  clib_memcpy (&e_addr, mp->external_addr, 4);
+  clib_memcpy (&l_addr, mp->local.addr, 4);
+  proto = ip_proto_to_nat_proto (mp->protocol);
+
+  rv =
+    nat44_lb_static_mapping_add_del_local (e_addr,
+					   mp->external_port,
+					   l_addr,
+					   mp->local.port,
+					   proto,
+					   clib_net_to_host_u32 (mp->
+								 local.vrf_id),
+					   mp->local.probability, mp->is_add);
+
+  REPLY_MACRO (VL_API_NAT44_LB_STATIC_MAPPING_ADD_DEL_LOCAL_REPLY);
+}
+
+static void
+send_nat44_lb_static_mapping_details (snat_static_mapping_t * m,
+				      vl_api_registration_t * reg,
+				      u32 context)
+{
+  vl_api_nat44_lb_static_mapping_details_t *rmp;
+  snat_main_t *sm = &snat_main;
+  nat44_lb_addr_port_t *ap;
+  vl_api_nat44_lb_addr_port_t *locals;
+  u32 local_num = 0;
+
+  rmp =
+    vl_msg_api_alloc (sizeof (*rmp) +
+		      (pool_elts (m->locals) *
+		       sizeof (nat44_lb_addr_port_t)));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id =
+    ntohs (VL_API_NAT44_LB_STATIC_MAPPING_DETAILS + sm->msg_id_base);
+
+  clib_memcpy (rmp->external_addr, &(m->external_addr), 4);
+  rmp->external_port = m->external_port;
+  rmp->protocol = nat_proto_to_ip_proto (m->proto);
+  rmp->context = context;
+
+  if (m->twice_nat == TWICE_NAT)
+    rmp->flags |= NAT_API_IS_TWICE_NAT;
+  else if (m->twice_nat == TWICE_NAT_SELF)
+    rmp->flags |= NAT_API_IS_SELF_TWICE_NAT;
+  if (is_out2in_only_static_mapping (m))
+    rmp->flags |= NAT_API_IS_OUT2IN_ONLY;
+  if (m->tag)
+    strncpy ((char *) rmp->tag, (char *) m->tag, vec_len (m->tag));
+
+  locals = (vl_api_nat44_lb_addr_port_t *) rmp->locals;
+  pool_foreach (ap, m->locals)
+   {
+    clib_memcpy (locals->addr, &(ap->addr), 4);
+    locals->port = ap->port;
+    locals->probability = ap->probability;
+    locals->vrf_id = ntohl (ap->vrf_id);
+    locals++;
+    local_num++;
+  }
+  rmp->local_num = ntohl (local_num);
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+  vl_api_nat44_lb_static_mapping_dump_t_handler
+  (vl_api_nat44_lb_static_mapping_dump_t * mp)
+{
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  snat_static_mapping_t *m;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  pool_foreach (m, sm->static_mappings)
+   {
+      if (is_lb_static_mapping(m))
+        send_nat44_lb_static_mapping_details (m, reg, mp->context);
+  }
+}
+
+static void
+vl_api_nat44_del_session_t_handler (vl_api_nat44_del_session_t * mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_del_session_reply_t *rmp;
+  ip4_address_t addr, eh_addr;
+  u16 port, eh_port;
+  u32 vrf_id;
+  int rv = 0;
+  u8 is_in;
+
+  memcpy (&addr.as_u8, mp->address, 4);
+  port = mp->port;
+  vrf_id = clib_net_to_host_u32 (mp->vrf_id);
+  memcpy (&eh_addr.as_u8, mp->ext_host_address, 4);
+  eh_port = mp->ext_host_port;
+
+  is_in = mp->flags & NAT_API_IS_INSIDE;
+
+  rv = nat44_del_ed_session (sm, &addr, port, &eh_addr, eh_port, mp->protocol,
+			     vrf_id, is_in);
+
+  REPLY_MACRO (VL_API_NAT44_DEL_SESSION_REPLY);
+}
+
+static void
+  vl_api_nat44_forwarding_enable_disable_t_handler
+  (vl_api_nat44_forwarding_enable_disable_t * mp)
+{
+  vl_api_nat44_forwarding_enable_disable_reply_t *rmp;
+  snat_main_t *sm = &snat_main;
+  int rv = 0;
+  nat44_ed_forwarding_enable_disable (mp->enable);
+  REPLY_MACRO (VL_API_NAT44_FORWARDING_ENABLE_DISABLE_REPLY);
+}
+
+static void
+  vl_api_nat44_forwarding_is_enabled_t_handler
+  (vl_api_nat44_forwarding_is_enabled_t * mp)
+{
+  vl_api_registration_t *reg;
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_forwarding_is_enabled_reply_t *rmp;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id =
+    ntohs (VL_API_NAT44_FORWARDING_IS_ENABLED_REPLY + sm->msg_id_base);
+  rmp->context = mp->context;
+
+  rmp->enabled = sm->forwarding_enabled;
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+vl_api_nat44_ed_set_fq_options_t_handler (vl_api_nat44_ed_set_fq_options_t *mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_ed_set_fq_options_reply_t *rmp;
+  int rv = 0;
+  u32 frame_queue_nelts = ntohl (mp->frame_queue_nelts);
+  rv = nat44_ed_set_frame_queue_nelts (frame_queue_nelts);
+  REPLY_MACRO (VL_API_NAT44_ED_SET_FQ_OPTIONS_REPLY);
+}
+
+static void
+vl_api_nat44_ed_show_fq_options_t_handler (
+  vl_api_nat44_ed_show_fq_options_t *mp)
+{
+  snat_main_t *sm = &snat_main;
+  vl_api_nat44_ed_show_fq_options_reply_t *rmp;
+  int rv = 0;
+  /* clang-format off */
+  REPLY_MACRO2_ZERO (VL_API_NAT44_ED_SHOW_FQ_OPTIONS_REPLY,
+  ({
+    rmp->frame_queue_nelts = htonl (sm->frame_queue_nelts);
+  }));
+  /* clang-format on */
+}
+
+/* API definitions */
+#include <vnet/format_fns.h>
+#include <nat/nat44-ed/nat44_ed.api.c>
+
+/* Set up the API message handling tables */
+clib_error_t *
+nat44_api_hookup (vlib_main_t * vm)
+{
+  snat_main_t *sm = &snat_main;
+  sm->msg_id_base = setup_message_id_table ();
+  return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */