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, 862 insertions, 0 deletions

diff --git a/src/plugins/nat/nat44-ei/nat44_ei.api b/src/plugins/nat/nat44-ei/nat44_ei.api
new file mode 100644
index 00000000000..708c20aaadd
--- /dev/null
+++ b/src/plugins/nat/nat44-ei/nat44_ei.api
@@ -0,0 +1,862 @@
+/*
+ * 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/lib/nat_types.api";
+
+enum nat44_ei_config_flags : u8
+{
+  NAT44_EI_NONE = 0x00,
+  NAT44_EI_STATIC_MAPPING_ONLY = 0x01,
+  NAT44_EI_CONNECTION_TRACKING = 0x02,
+  NAT44_EI_OUT2IN_DPO = 0x04,
+  NAT44_EI_ADDR_ONLY_MAPPING = 0x08,
+  NAT44_EI_IF_INSIDE = 0x10,
+  NAT44_EI_IF_OUTSIDE = 0x20,
+  NAT44_EI_STATIC_MAPPING = 0x40,
+};
+
+/** \brief Enable/disable NAT44 plugin
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param inside_vrf - inside vrf id
+    @param outside_vrf - outside vrf id
+    @param users - maximum number of users per thread
+    @param user_memory - overwrite hash allocation parameter
+    @param sessions - maximum number of sessions per thread
+    @param session_memory - overwrite hash allocation parameter
+    @param user_sessions - maximum number of sessions per user
+    @param enable - true if enable, false if disable
+    @param flags - flag NAT44_EI_IS_STATIC_MAPPING_ONLY,
+                        NAT44_EI_IS_CONNECTION_TRACKING,
+                        NAT44_EI_IS_OUT2IN_DPO
+*/
+autoreply define nat44_ei_plugin_enable_disable {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  u32 inside_vrf;
+  u32 outside_vrf;
+  u32 users;
+  u32 user_memory;
+  u32 sessions;
+  u32 session_memory;
+  u32 user_sessions;
+  bool enable;
+  vl_api_nat44_ei_config_flags_t flags;
+};
+
+/** \brief Show NAT44 plugin running config
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_show_running_config
+{
+  option in_progress;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief Show NAT44 plugin running config reply
+    @param context - sender context, to match reply w/ request
+    @param retval - return code for the request
+    @param inside_vrf - default inside VRF id
+    @param outside_vrf - outside VRF id
+    @param users - maximum number of users per worker thread
+    @param sessions - maximum number of sessions per worker thread
+    @param user_sessions - maximum number of sessions per user
+    @param user_buckets - number of user hash buckets
+    @param translation_buckets - number of translation hash buckets
+    @param flags - flag NAT44_EI_IS_STATIC_MAPPING_ONLY,
+                        NAT44_EI_IS_CONNECTION_TRACKING,
+                        NAT44_EI_IS_OUT2IN_DPO
+*/
+define nat44_ei_show_running_config_reply
+{
+  option in_progress;
+  u32 context;
+  i32 retval;
+  u32 inside_vrf;
+  u32 outside_vrf;
+  u32 users;
+  u32 sessions;
+  u32 user_sessions;
+  u32 user_buckets;
+  u32 translation_buckets;
+  bool forwarding_enabled;
+  bool ipfix_logging_enabled;
+  vl_api_nat_timeouts_t timeouts;
+  vl_api_nat_log_level_t log_level;
+  vl_api_nat44_ei_config_flags_t flags;
+};
+
+/** \brief Set NAT44 logging level
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param log_level - logging level
+*/
+autoreply define nat44_ei_set_log_level {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+  vl_api_nat_log_level_t log_level;
+};
+
+/** \brief Set NAT workers
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param worker_mask - NAT workers mask
+*/
+autoreply define nat44_ei_set_workers {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  u64 worker_mask;
+};
+
+/** \brief Dump NAT workers
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_worker_dump {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT workers details response
+    @param context - sender context, to match reply w/ request
+    @param worker_index - worker index
+    @param lcore_id - lcore ID
+    @param name - worker name
+*/
+define nat44_ei_worker_details {
+  option in_progress;
+  u32 context;
+  u32 worker_index;
+  u32 lcore_id;
+  string name[64];
+};
+
+/** \brief Enable/disable NAT IPFIX logging
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param domain_id - observation domain ID
+    @param src_port - source port number
+    @param enable - true if enable, false if disable
+*/
+autoreply define nat44_ei_ipfix_enable_disable {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  u32 domain_id;
+  u16 src_port;
+  bool enable;
+};
+
+/** \brief Set values of timeouts for NAT 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 nat44_ei_set_timeouts {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  u32 udp;
+  u32 tcp_established;
+  u32 tcp_transitory;
+  u32 icmp;
+};
+
+/** \brief Set address and port assignment algorithm
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param alg - address and port assignment algorithm:
+                 0 - default, 1 - MAP-E, 2 - port range
+                 (see nat44_ei_addr_and_port_alloc_alg_t in nat.h)
+    @param psid_offset - number of offset bits (valid only for MAP-E alg)
+    @param psid_length - length of PSID (valid only for MAP-E alg)
+    @param psid - Port Set Identifier (PSID) value (valid only for MAP-E alg)
+    @param start_port - beginning of the port range
+    @param end_port - end of the port range
+*/
+autoreply define nat44_ei_set_addr_and_port_alloc_alg {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  u8 alg;
+  u8 psid_offset;
+  u8 psid_length;
+  u16 psid;
+  u16 start_port;
+  u16 end_port;
+};
+
+/** \brief Get address and port assignment algorithm
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_get_addr_and_port_alloc_alg {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief Get address and port assignment algorithm reply
+    @param context - sender context, to match reply w/ request
+    @param retval - return code
+    @param alg - address and port assignment algorithm:
+                 0 - default, 1 - MAP-E, 2 - port range
+                 (see nat44_ei_addr_and_port_alloc_alg_t in nat.h)
+    @param psid_offset - number of offset bits (valid only for MAP-E alg)
+    @param psid_length - length of PSID (valid only for MAP-E alg)
+    @param psid - Port Set Identifier (PSID) value (valid only for MAP-E alg)
+    @param start_port - beginning of the port range
+    @param end_port - end of the port range
+*/
+define nat44_ei_get_addr_and_port_alloc_alg_reply {
+  option deprecated;
+  u32 context;
+  i32 retval;
+  u8 alg;
+  u8 psid_offset;
+  u8 psid_length;
+  u16 psid;
+  u16 start_port;
+  u16 end_port;
+};
+
+/** \brief Set TCP MSS rewriting configuration
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param mss_value - MSS value to be used for MSS rewriting
+    @param enable - if true enable MSS rewriting feature else disable
+*/
+autoreply define nat44_ei_set_mss_clamping {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  u16 mss_value;
+  bool enable;
+};
+
+/** \brief Get TCP MSS rewriting configuration
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_get_mss_clamping {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief Get TCP MSS rewriting configuration reply
+    @param context - sender context, to match reply w/ request
+    @param retval - return code
+    @param mss_value - MSS value to be used for MSS rewriting
+    @param enable - if true enable MSS rewriting feature else disable
+*/
+define nat44_ei_get_mss_clamping_reply {
+  option deprecated;
+  u32 context;
+  i32 retval;
+  u16 mss_value;
+  bool enable;
+};
+
+/** \brief Set HA listener (local settings)
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param ip_address - local IP4 address
+    @param port - local UDP port number
+    @param path_mtu - path MTU between local and failover
+*/
+autoreply define nat44_ei_ha_set_listener {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  vl_api_ip4_address_t ip_address;
+  u16 port;
+  u32 path_mtu;
+};
+
+/** \brief Set HA failover (remote settings)
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param ip_address - failover IP4 address
+    @param port - failvoer UDP port number
+    @param session_refresh_interval - number of seconds after which to send
+                                      session counters refresh
+*/
+autoreply define nat44_ei_ha_set_failover {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  vl_api_ip4_address_t ip_address;
+  u16 port;
+  u32 session_refresh_interval;
+};
+
+/** \brief Get HA listener/local configuration
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_ha_get_listener {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief Get HA listener/local configuration reply
+    @param context - sender context, to match reply w/ request
+    @param retval - return code
+    @param ip_address - local IP4 address
+    @param port - local UDP port number
+    @param path_mtu - Path MTU between local and failover
+*/
+define nat44_ei_ha_get_listener_reply {
+  option deprecated;
+  u32 context;
+  i32 retval;
+  vl_api_ip4_address_t ip_address;
+  u16 port;
+  u32 path_mtu;
+};
+
+/** \brief Get HA failover/remote settings
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_ha_get_failover {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief Get HA failover/remote settings reply
+    @param context - sender context, to match reply w/ request
+    @param retval - return code
+    @param ip_address - failover IP4 address
+    @param port - failvoer UDP port number
+    @param session_refresh_interval - number of seconds after which to send
+                                      session counters refresh
+*/
+define nat44_ei_ha_get_failover_reply {
+  option deprecated;
+  u32 context;
+  i32 retval;
+  vl_api_ip4_address_t ip_address;
+  u16 port;
+  u32 session_refresh_interval;
+};
+
+/** \brief Flush the current HA data (for testing)
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+autoreply define nat44_ei_ha_flush {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief Resync HA (resend existing sessions to new failover)
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param want_resync_event - resync completed event sent to the sender via
+                               nat44_ei_ha_resync_completed_event API message if
+                               non-zero
+    @param pid - sender's pid
+*/
+autoreply define nat44_ei_ha_resync
+{
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  u8 want_resync_event;
+  u32 pid;
+};
+
+/** \brief Tell client about a HA resync completion event
+    @param client_index - opaque cookie to identify the sender
+    @param pid - client pid registered to receive notification
+    @param missed_count - number of missed (not ACKed) messages
+*/
+define nat44_ei_ha_resync_completed_event
+{
+  option in_progress;
+  u32 client_index;
+  u32 pid;
+  u32 missed_count;
+};
+
+service {
+  rpc nat44_ei_ha_resync returns nat44_ei_ha_resync_reply events nat44_ei_ha_resync_completed_event;
+};
+
+/** \brief Del NAT44 user
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param ip_address - IPv4 address
+    @param fib_index - FIB index
+*/
+autoreply define nat44_ei_del_user {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  vl_api_ip4_address_t ip_address;
+  u32 fib_index;
+};
+
+/** \brief Add/del NAT44 address range
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param first_ip_address - first IPv4 address
+    @param last_ip_address - last IPv4 address
+    @param vrf_id - VRF id of tenant, ~0 means independent of VRF
+    @param is_add - true if add, false if delete
+
+*/
+autoreply define nat44_ei_add_del_address_range {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  vl_api_ip4_address_t first_ip_address;
+  vl_api_ip4_address_t last_ip_address;
+  u32 vrf_id;
+  bool is_add;
+};
+
+/** \brief Dump NAT44 addresses
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_address_dump {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT44 address details response
+    @param context - sender context, to match reply w/ request
+    @param ip_address - IPv4 address
+    @param vrf_id - VRF id of tenant, ~0 means independent of VRF
+*/
+define nat44_ei_address_details {
+  option in_progress;
+  u32 context;
+  vl_api_ip4_address_t ip_address;
+  u32 vrf_id;
+};
+
+/** \brief Enable/disable NAT44 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 - software index of the interface
+*/
+autoreply define nat44_ei_interface_add_del_feature {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  bool is_add;
+  vl_api_nat44_ei_config_flags_t flags;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief Dump interfaces with NAT44 feature
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_interface_dump {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT44 interface details response
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - software index of the interface
+    @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
+*/
+define nat44_ei_interface_details {
+  option in_progress;
+  u32 context;
+  vl_api_nat44_ei_config_flags_t flags;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief Enable/disbale NAT44 as an interface output feature (postrouting
+           in2out translation)
+    @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 - software index of the interface
+*/
+autoreply define nat44_ei_interface_add_del_output_feature {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+  bool is_add;
+  vl_api_nat44_ei_config_flags_t flags;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief Dump interfaces with NAT44 output feature
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_interface_output_feature_dump {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT44 interface with output feature details response
+    @param context - sender context, to match reply w/ request
+    @param flags - flag NAT_IS_INSIDE if interface is inside else
+                   interface is outside
+    @param sw_if_index - software index of the interface
+*/
+define nat44_ei_interface_output_feature_details {
+  option deprecated;
+  u32 context;
+  vl_api_nat44_ei_config_flags_t flags;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief Add/delete NAT44 static mapping
+    @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 NAT44_EI_IS_ADDR_ONLY if address only mapping
+    @param local_ip_address - local IPv4 address
+    @param external_ip_address - external IPv4 address
+    @param protocol - IP protocol, used only if addr_only=0
+    @param local_port - local port number, used only if addr_only=0
+    @param external_port - external port number, used only if addr_only=0
+    @param external_sw_if_index - external interface (if set
+                                  external_ip_address is ignored, ~0 means not
+                                  used)
+    @param vfr_id - VRF ID
+    @param tag - opaque string tag
+*/
+autoreply define nat44_ei_add_del_static_mapping {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  bool is_add;
+  vl_api_nat44_ei_config_flags_t flags;
+  vl_api_ip4_address_t local_ip_address;
+  vl_api_ip4_address_t external_ip_address;
+  u8 protocol;
+  u16 local_port;
+  u16 external_port;
+  vl_api_interface_index_t external_sw_if_index;
+  u32 vrf_id;
+  string tag[64];
+};
+
+/** \brief Dump NAT44 static mappings
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_static_mapping_dump {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT44 static mapping details response
+    @param context - sender context, to match reply w/ request
+    @param flags - flag NAT44_EI_IS_ADDR_ONLY if address only mapping,
+    @param local_ip_address - local IPv4 address
+    @param external_ip_address - external IPv4 address
+    @param protocol - IP protocol, valid only if no NAT_ADDR_ONLY flag
+    @param local_port - local port number, valid only if no NAT_ADDR_ONLY flag
+    @param external_port - external port number, valid only if no NAT_ADDR_ONLY flag
+    @param external_sw_if_index - external interface
+    @param vfr_id - VRF ID
+    @param tag - opaque string tag
+*/
+define nat44_ei_static_mapping_details {
+  option in_progress;
+  u32 context;
+  vl_api_nat44_ei_config_flags_t flags;
+  vl_api_ip4_address_t local_ip_address;
+  vl_api_ip4_address_t external_ip_address;
+  u8 protocol;
+  u16 local_port;
+  u16 external_port;
+  vl_api_interface_index_t external_sw_if_index;
+  u32 vrf_id;
+  string tag[64];
+};
+
+/** \brief Add/delete NAT44 identity mapping
+    @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 NAT44_EI_IS_ADDR_ONLY if address only mapping
+    @param ip_address - IPv4 address
+    @param protocol - IP protocol
+    @param port - port number
+    @param sw_if_index - interface (if set ip_address is ignored, ~0 means not
+                                    used)
+    @param vfr_id - VRF ID (if ~0 use default VRF)
+    @param tag - opaque string tag
+*/
+autoreply define nat44_ei_add_del_identity_mapping {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+  bool is_add;
+  vl_api_nat44_ei_config_flags_t flags;
+  vl_api_ip4_address_t ip_address;
+  u8 protocol;
+  u16 port;
+  vl_api_interface_index_t sw_if_index;
+  u32 vrf_id;
+  string tag[64];
+};
+
+/** \brief Dump NAT44 identity mappings
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_identity_mapping_dump {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT44 identity mapping details response
+    @param context - sender context, to match reply w/ request
+    @param flags - flag NAT44_EI_ADDR_ONLY if address only mapping
+    @param ip_address - IPv4 address
+    @param protocol - IP protocol
+    @param port - port number
+    @param sw_if_index - interface
+    @param vfr_id - VRF ID
+    @param tag - opaque string tag
+*/
+define nat44_ei_identity_mapping_details {
+  option deprecated;
+  u32 context;
+  vl_api_nat44_ei_config_flags_t flags;
+  vl_api_ip4_address_t ip_address;
+  u8 protocol;
+  u16 port;
+  vl_api_interface_index_t sw_if_index;
+  u32 vrf_id;
+  string tag[64];
+};
+
+/** \brief Add/delete NAT44 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
+    @param flags - flag NAT_TWICE_NAT if NAT address range for external hosts
+*/
+autoreply define nat44_ei_add_del_interface_addr {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+  bool is_add;
+  vl_api_interface_index_t sw_if_index;
+  vl_api_nat44_ei_config_flags_t flags;
+};
+
+/** \brief Dump NAT44 pool addresses interfaces
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_interface_addr_dump {
+  option deprecated;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT44 pool addresses interfaces details response
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - software index of the interface
+
+*/
+define nat44_ei_interface_addr_details {
+  option deprecated;
+  u32 context;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief Dump NAT44 users
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_user_dump {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT44 users response
+    @param context - sender context, to match reply w/ request
+    @vrf_id - VRF ID
+    @param ip_address - IPv4 address
+    @param nsessions - number of dynamic sessions
+    @param nstaticsessions - number of static sessions
+*/
+define nat44_ei_user_details {
+  option in_progress;
+  u32 context;
+  u32 vrf_id;
+  vl_api_ip4_address_t ip_address;
+  u32 nsessions;
+  u32 nstaticsessions;
+};
+
+/** \brief NAT44 user's sessions
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param ip_address - IPv4 address of the user to dump
+    @param vrf_id - VRF_ID
+*/
+define nat44_ei_user_session_dump {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  vl_api_ip4_address_t ip_address;
+  u32 vrf_id;
+};
+
+/** \brief NAT44 user's sessions response
+    @param context - sender context, to match reply w/ request
+    @param outside_ip_address - outside IPv4 address
+    @param outside_port - outside port
+    @param inside_ip_address - inside IPv4 address
+    @param inside_port - inside port
+    @param protocol - protocol
+    @param flags - flag NAT_IS_STATIC if session is static
+    @param last_heard - last heard timer
+    @param total_bytes - count of bytes sent through session
+    @param total_pkts - count of pakets sent through session
+    @param ext_host_address - external host IPv4 address
+    @param ext_host_port - external host port
+*/
+define nat44_ei_user_session_details {
+  option in_progress;
+  u32 context;
+  vl_api_ip4_address_t outside_ip_address;
+  u16 outside_port;
+  vl_api_ip4_address_t inside_ip_address;
+  u16 inside_port;
+  u16 protocol;
+  vl_api_nat44_ei_config_flags_t flags;
+  u64 last_heard;
+  u64 total_bytes;
+  u32 total_pkts;
+  vl_api_ip4_address_t ext_host_address;
+  u16 ext_host_port;
+};
+
+/** \brief Delete NAT44 session
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param ip_address - IPv4 address
+    @param protocol - IP protocol
+    @param port - port number
+    @param vfr_id - VRF ID
+    @param flags - flag NAT_IS_INSIDE if interface is inside or
+                   interface is outside,
+                   flag NAT_IS_EXT_HOST_VALID if external host address and
+                   port are valid
+    @param ext_host_address - external host IPv4 address
+    @param ext_host_port - external host port
+*/
+autoreply define nat44_ei_del_session {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  vl_api_ip4_address_t address;
+  u8 protocol;
+  u16 port;
+  u32 vrf_id;
+  vl_api_nat44_ei_config_flags_t flags;
+  vl_api_ip4_address_t ext_host_address;
+  u16 ext_host_port;
+};
+
+/** \brief Enable/disable forwarding for NAT44
+    Forward packets which don't match existing translation
+    or static mapping instead of dropping them.
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param enable - true for enable, false for disable
+*/
+autoreply define nat44_ei_forwarding_enable_disable {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  bool enable;
+};
+
+/** \brief Set NAT handoff frame queue options
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param frame_queue_nelts - number of worker handoff frame queue elements
+*/
+autoreply define nat44_ei_set_fq_options {
+  option in_progress;
+  u32 client_index;
+  u32 context;
+  u32 frame_queue_nelts;
+};
+
+/** \brief Show NAT handoff frame queue options
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat44_ei_show_fq_options
+{
+  option in_progress;
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief Show NAT handoff frame queue options reply
+    @param context - sender context, to match reply w/ request
+    @param retval - return code for the request
+    @param frame_queue_nelts - number of worker handoff frame queue elements
+*/
+define nat44_ei_show_fq_options_reply
+{
+  option in_progress;
+  u32 context;
+  i32 retval;
+  u32 frame_queue_nelts;
+};