text: /*
   * Copyright (c) 2018 Cisco and/or its affiliates.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at:
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /**
   * @file
   * @brief NAT44 CLI
   */
  
  #include <nat/nat.h>
  #include <nat/lib/ipfix_logging.h>
  #include <nat/lib/nat_inlines.h>
  #include <nat/nat_inlines.h>
  #include <nat/nat44/inlines.h>
  #include <nat/nat_affinity.h>
  #include <vnet/fib/fib_table.h>
  
  #include <nat/nat44-ei/nat44_ei_ha.h>
  #include <nat/nat44-ei/nat44_ei.h>
  
  #define UNSUPPORTED_IN_ED_MODE_STR \
    "This command is unsupported in endpoint dependent mode"
  #define SUPPORTED_ONLY_IN_ED_MODE_STR \
    "This command is supported only in endpoint dependent mode"
  
  static clib_error_t *
  nat44_enable_command_fn (vlib_main_t * vm,
  			 unformat_input_t * input, vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    unformat_input_t _line_input, *line_input = &_line_input;
    clib_error_t *error = 0;
  
    nat44_config_t c = { 0 };
    u8 mode_set = 0;
  
    if (sm->enabled)
      return clib_error_return (0, "nat44 already enabled");
  
    /* Get a line of input. */
    if (!unformat_user (input, unformat_line_input, line_input))
      {
        if (nat44_plugin_enable (c) != 0)
  	return clib_error_return (0, "nat44 enable failed");
        return 0;
      }
  
    while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
      {
        if (!mode_set && unformat (line_input, "static-mapping-only"))
  	{
  	  mode_set = 1;
  	  c.static_mapping_only = 1;
  	  if (unformat (line_input, "connection-tracking"))
  	    {
  	      c.connection_tracking = 1;
  	    }
  	}
        else if (!mode_set && unformat (line_input, "out2in-dpo"))
  	{
  	  mode_set = 1;
  	  c.out2in_dpo = 1;
  	}
        else if (!mode_set && unformat (line_input, "endpoint-dependent"))
  	{
  	  mode_set = 1;
  	  c.endpoint_dependent = 1;
  	}
        else if (unformat (line_input, "inside-vrf %u", &c.inside_vrf));
        else if (unformat (line_input, "outside-vrf %u", &c.outside_vrf));
        else if (unformat (line_input, "users %u", &c.users));
        else if (unformat (line_input, "sessions %u", &c.sessions));
        else if (unformat (line_input, "user-sessions %u", &c.user_sessions));
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    if (!c.sessions)
      {
        error = clib_error_return (0, "number of sessions is required");
        goto done;
      }
  
    if (nat44_plugin_enable (c) != 0)
      error = clib_error_return (0, "nat44 enable failed");
  done:
    unformat_free (line_input);
    return error;
  }
  
  static clib_error_t *
  nat44_disable_command_fn (vlib_main_t * vm,
  			  unformat_input_t * input, vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    clib_error_t *error = 0;
  
    if (!sm->enabled)
      return clib_error_return (0, "nat44 already disabled");
  
    if (nat44_plugin_disable () != 0)
      error = clib_error_return (0, "nat44 disable failed");
  
    return error;
  }
  
  static clib_error_t *
  set_workers_command_fn (vlib_main_t * vm,
  			unformat_input_t * input, vlib_cli_command_t * cmd)
  {
    unformat_input_t _line_input, *line_input = &_line_input;
    uword *bitmap = 0;
    int rv = 0;
    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_bitmap_list, &bitmap))
  	;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    if (bitmap == 0)
      {
        error = clib_error_return (0, "List of workers must be specified.");
        goto done;
      }
  
    rv = snat_set_workers (bitmap);
  
    clib_bitmap_free (bitmap);
  
    switch (rv)
      {
      case VNET_API_ERROR_INVALID_WORKER:
        error = clib_error_return (0, "Invalid worker(s).");
        goto done;
      case VNET_API_ERROR_FEATURE_DISABLED:
        error = clib_error_return (0,
  				 "Supported only if 2 or more workes available.");
        goto done;
      default:
        break;
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  nat_show_workers_commnad_fn (vlib_main_t * vm, unformat_input_t * input,
  			     vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    u32 *worker;
  
    if (sm->num_workers > 1)
      {
        vlib_cli_output (vm, "%d workers", vec_len (sm->workers));
        /* *INDENT-OFF* */
        vec_foreach (worker, sm->workers)
          {
            vlib_worker_thread_t *w =
              vlib_worker_threads + *worker + sm->first_worker_index;
            vlib_cli_output (vm, "  %s", w->name);
          }
        /* *INDENT-ON* */
      }
  
    return 0;
  }
  
  static clib_error_t *
  snat_set_log_level_command_fn (vlib_main_t * vm,
  			       unformat_input_t * input,
  			       vlib_cli_command_t * cmd)
  {
    unformat_input_t _line_input, *line_input = &_line_input;
    snat_main_t *sm = &snat_main;
    u8 log_level = SNAT_LOG_NONE;
    clib_error_t *error = 0;
  
    /* Get a line of input. */
    if (!unformat_user (input, unformat_line_input, line_input))
      return 0;
  
    if (!unformat (line_input, "%d", &log_level))
      {
        error = clib_error_return (0, "unknown input '%U'",
  				 format_unformat_error, line_input);
        goto done;
      }
    if (log_level > SNAT_LOG_DEBUG)
      {
        error = clib_error_return (0, "unknown logging level '%d'", log_level);
        goto done;
      }
    sm->log_level = log_level;
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  snat_ipfix_logging_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;
    u32 domain_id = 0;
    u32 src_port = 0;
    u8 enable = 1;
    int rv = 0;
    clib_error_t *error = 0;
  
    /* Get a line of input. */
    if (!unformat_user (input, unformat_line_input, line_input))
      {
        rv = nat_ipfix_logging_enable_disable (enable, domain_id,
  					     (u16) src_port);
        if (rv)
  	return clib_error_return (0, "ipfix logging enable failed");
        return 0;
      }
  
    while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
      {
        if (unformat (line_input, "domain %d", &domain_id))
  	;
        else if (unformat (line_input, "src-port %d", &src_port))
  	;
        else if (unformat (line_input, "disable"))
  	enable = 0;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    rv = nat_ipfix_logging_enable_disable (enable, domain_id, (u16) src_port);
  
    if (rv)
      {
        error = clib_error_return (0, "ipfix logging enable failed");
        goto done;
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  nat44_show_hash_command_fn (vlib_main_t * vm, unformat_input_t * input,
  			    vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    snat_main_per_thread_data_t *tsm;
    nat_affinity_main_t *nam = &nat_affinity_main;
    int i;
    int verbose = 0;
  
    if (unformat (input, "detail"))
      verbose = 1;
    else if (unformat (input, "verbose"))
      verbose = 2;
  
    vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->static_mapping_by_local,
  		   verbose);
    vlib_cli_output (vm, "%U",
  		   format_bihash_8_8, &sm->static_mapping_by_external,
  		   verbose);
    vlib_cli_output (vm, "%U", format_bihash_16_8, &sm->flow_hash, verbose);
    vec_foreach_index (i, sm->per_thread_data)
    {
      tsm = vec_elt_at_index (sm->per_thread_data, i);
      vlib_cli_output (vm, "-------- thread %d %s --------\n",
  		     i, vlib_worker_threads[i].name);
      if (sm->endpoint_dependent)
        {
  	vlib_cli_output (vm, "%U", format_bihash_16_8, &sm->flow_hash,
  			 verbose);
        }
      else
        {
  	vlib_cli_output (vm, "%U", format_bihash_8_8, &tsm->in2out, verbose);
  	vlib_cli_output (vm, "%U", format_bihash_8_8, &tsm->out2in, verbose);
        }
      vlib_cli_output (vm, "%U", format_bihash_8_8, &tsm->user_hash, verbose);
    }
  
    if (sm->endpoint_dependent)
      {
        vlib_cli_output (vm, "%U", format_bihash_16_8, &nam->affinity_hash,
  		       verbose);
      }
  
    vlib_cli_output (vm, "-------- hash table parameters --------\n");
    vlib_cli_output (vm, "translation buckets: %u", sm->translation_buckets);
    if (!sm->endpoint_dependent)
      {
        vlib_cli_output (vm, "user buckets: %u", sm->user_buckets);
      }
    return 0;
  }
  
  static clib_error_t *
  nat44_set_alloc_addr_and_port_alg_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;
    u32 psid, psid_offset, psid_length, port_start, port_end;
    snat_main_t *sm = &snat_main;
  
    if (sm->endpoint_dependent)
      return clib_error_return (0, UNSUPPORTED_IN_ED_MODE_STR);
  
    /* 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, "default"))
  	nat44_ei_set_alloc_default ();
        else
  	if (unformat
  	    (line_input, "map-e psid %d psid-offset %d psid-len %d", &psid,
  	     &psid_offset, &psid_length))
  	nat44_ei_set_alloc_mape ((u16) psid, (u16) psid_offset,
  				 (u16) psid_length);
        else
  	if (unformat
  	    (line_input, "port-range %d - %d", &port_start, &port_end))
  	{
  	  if (port_end <= port_start)
  	    {
  	      error =
  		clib_error_return (0,
  				   "The end-port must be greater than start-port");
  	      goto done;
  	    }
  	  nat44_ei_set_alloc_range ((u16) port_start, (u16) port_end);
  	}
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  };
  
  static clib_error_t *
  nat44_show_alloc_addr_and_port_alg_command_fn (vlib_main_t * vm,
  					       unformat_input_t * input,
  					       vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
  
    vlib_cli_output (vm, "NAT address and port: %U",
  		   format_nat_addr_and_port_alloc_alg,
  		   sm->addr_and_port_alloc_alg);
    switch (sm->addr_and_port_alloc_alg)
      {
      case NAT_ADDR_AND_PORT_ALLOC_ALG_MAPE:
        vlib_cli_output (vm, "  psid %d psid-offset %d psid-len %d", sm->psid,
  		       sm->psid_offset, sm->psid_length);
        break;
      case NAT_ADDR_AND_PORT_ALLOC_ALG_RANGE:
        vlib_cli_output (vm, "  start-port %d end-port %d", sm->start_port,
  		       sm->end_port);
        break;
      default:
        break;
      }
  
    return 0;
  }
  
  static clib_error_t *
  nat_set_mss_clamping_command_fn (vlib_main_t * vm, unformat_input_t * input,
  				 vlib_cli_command_t * cmd)
  {
    unformat_input_t _line_input, *line_input = &_line_input;
    snat_main_t *sm = &snat_main;
    clib_error_t *error = 0;
    u32 mss;
  
    /* 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, "disable"))
  	sm->mss_clamping = 0;
        else if (unformat (line_input, "%d", &mss))
  	sm->mss_clamping = (u16) mss;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  nat_show_mss_clamping_command_fn (vlib_main_t * vm, unformat_input_t * input,
  				  vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
  
    if (sm->mss_clamping)
      vlib_cli_output (vm, "mss-clamping %d", sm->mss_clamping);
    else
      vlib_cli_output (vm, "mss-clamping disabled");
  
    return 0;
  }
  
  static clib_error_t *
  nat_ha_failover_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 addr;
    u32 port, session_refresh_interval = 10;
    int rv;
    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, &addr, &port))
  	;
        else
  	if (unformat
  	    (line_input, "refresh-interval %u", &session_refresh_interval))
  	;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    rv = nat_ha_set_failover (&addr, (u16) port, session_refresh_interval);
    if (rv)
      error = clib_error_return (0, "set HA failover failed");
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  nat_ha_listener_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 addr;
    u32 port, path_mtu = 512;
    int rv;
    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, &addr, &port))
  	;
        else if (unformat (line_input, "path-mtu %u", &path_mtu))
  	;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    rv = nat_ha_set_listener (&addr, (u16) port, path_mtu);
    if (rv)
      error = clib_error_return (0, "set HA listener failed");
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  nat_show_ha_command_fn (vlib_main_t * vm, unformat_input_t * input,
  			vlib_cli_command_t * cmd)
  {
    ip4_address_t addr;
    u16 port;
    u32 path_mtu, session_refresh_interval, resync_ack_missed;
    u8 in_resync;
  
    nat_ha_get_listener (&addr, &port, &path_mtu);
    if (!port)
      {
        vlib_cli_output (vm, "NAT HA disabled\n");
        return 0;
      }
  
    vlib_cli_output (vm, "LISTENER:\n");
    vlib_cli_output (vm, "  %U:%u path-mtu %u\n",
  		   format_ip4_address, &addr, port, path_mtu);
  
    nat_ha_get_failover (&addr, &port, &session_refresh_interval);
    vlib_cli_output (vm, "FAILOVER:\n");
    if (port)
      vlib_cli_output (vm, "  %U:%u refresh-interval %usec\n",
  		     format_ip4_address, &addr, port,
  		     session_refresh_interval);
    else
      vlib_cli_output (vm, "  NA\n");
  
    nat_ha_get_resync_status (&in_resync, &resync_ack_missed);
    vlib_cli_output (vm, "RESYNC:\n");
    if (in_resync)
      vlib_cli_output (vm, "  in progress\n");
    else
      vlib_cli_output (vm, "  completed (%d ACK missed)\n", resync_ack_missed);
  
    return 0;
  }
  
  static clib_error_t *
  nat_ha_flush_command_fn (vlib_main_t * vm, unformat_input_t * input,
  			 vlib_cli_command_t * cmd)
  {
    nat_ha_flush (0);
    return 0;
  }
  
  static clib_error_t *
  nat_ha_resync_command_fn (vlib_main_t * vm, unformat_input_t * input,
  			  vlib_cli_command_t * cmd)
  {
    clib_error_t *error = 0;
  
    if (nat_ha_resync (0, 0, 0))
      error = clib_error_return (0, "NAT HA resync already running");
  
    return error;
  }
  
  static clib_error_t *
  add_address_command_fn (vlib_main_t * vm,
  			unformat_input_t * input, vlib_cli_command_t * cmd)
  {
    unformat_input_t _line_input, *line_input = &_line_input;
    snat_main_t *sm = &snat_main;
    ip4_address_t start_addr, end_addr, this_addr;
    u32 start_host_order, end_host_order;
    u32 vrf_id = ~0;
    int i, count;
    int is_add = 1;
    int rv = 0;
    clib_error_t *error = 0;
    u8 twice_nat = 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, "twice-nat"))
  	twice_nat = 1;
        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 (sm->static_mapping_only)
      {
        error = clib_error_return (0, "static mapping only mode");
        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;
  
    if (count > 1024)
      nat_log_info ("%U - %U, %d addresses...",
  		  format_ip4_address, &start_addr,
  		  format_ip4_address, &end_addr, count);
  
    this_addr = start_addr;
  
    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);
  
        switch (rv)
  	{
  	case VNET_API_ERROR_VALUE_EXIST:
  	  error = clib_error_return (0, "NAT address already in use.");
  	  goto done;
  	case VNET_API_ERROR_NO_SUCH_ENTRY:
  	  error = clib_error_return (0, "NAT address not exist.");
  	  goto done;
  	case VNET_API_ERROR_UNSPECIFIED:
  	  error =
  	    clib_error_return (0, "NAT address used in static mapping.");
  	  goto done;
  	case VNET_API_ERROR_FEATURE_DISABLED:
  	  error =
  	    clib_error_return (0,
  			       "twice NAT available only for endpoint-dependent mode.");
  	  goto done;
  	default:
  	  break;
  	}
  
        if (sm->out2in_dpo)
  	nat44_add_del_address_dpo (this_addr, is_add);
  
        increment_v4_address (&this_addr);
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static void
  nat44_show_lru_summary (vlib_main_t * vm, snat_main_per_thread_data_t * tsm,
  			u64 now, u64 sess_timeout_time)
  {
    snat_main_t *sm = &snat_main;
    dlist_elt_t *oldest_elt;
    snat_session_t *s;
    u32 oldest_index;
  
  #define _(n, d)                                                          \
    oldest_index =                                                         \
        clib_dlist_remove_head (tsm->lru_pool, tsm->n##_lru_head_index);   \
    if (~0 != oldest_index)                                                \
      {                                                                    \
        oldest_elt = pool_elt_at_index (tsm->lru_pool, oldest_index);      \
        s = pool_elt_at_index (tsm->sessions, oldest_elt->value);          \
        sess_timeout_time =                                                \
            s->last_heard + (f64)nat44_session_get_timeout (sm, s);        \
        vlib_cli_output (vm, d " LRU min session timeout %llu (now %llu)", \
                         sess_timeout_time, now);                          \
        clib_dlist_addhead (tsm->lru_pool, tsm->n##_lru_head_index,        \
                            oldest_index);                                 \
      }
    _(tcp_estab, "established tcp");
    _(tcp_trans, "transitory tcp");
    _(udp, "udp");
    _(unk_proto, "unknown protocol");
    _(icmp, "icmp");
  #undef _
  }
  
  static clib_error_t *
  nat44_show_summary_command_fn (vlib_main_t * vm, unformat_input_t * input,
  			       vlib_cli_command_t * cmd)
  {
    snat_main_per_thread_data_t *tsm;
    snat_main_t *sm = &snat_main;
    snat_session_t *s;
  
    if (!sm->endpoint_dependent)
      return clib_error_return (0, SUPPORTED_ONLY_IN_ED_MODE_STR);
  
    u32 count = 0;
  
    u64 now = vlib_time_now (vm);
    u64 sess_timeout_time = 0;
  
    u32 udp_sessions = 0;
    u32 tcp_sessions = 0;
    u32 icmp_sessions = 0;
  
    u32 timed_out = 0;
    u32 transitory = 0;
    u32 transitory_wait_closed = 0;
    u32 transitory_closed = 0;
    u32 established = 0;
  
    u32 fib;
  
    for (fib = 0; fib < vec_len (sm->max_translations_per_fib); fib++)
      vlib_cli_output (vm, "max translations per thread: %u fib %u",
  		     sm->max_translations_per_fib[fib], fib);
  
    if (sm->num_workers > 1)
      {
        /* *INDENT-OFF* */
        vec_foreach (tsm, sm->per_thread_data)
          {
            pool_foreach (s, tsm->sessions)
             {
              sess_timeout_time = s->last_heard +
  	      (f64) nat44_session_get_timeout (sm, s);
              if (now >= sess_timeout_time)
                timed_out++;
  
              switch (s->nat_proto)
                {
                case NAT_PROTOCOL_ICMP:
                  icmp_sessions++;
                  break;
                case NAT_PROTOCOL_TCP:
                  tcp_sessions++;
                  if (s->state)
                    {
                      if (s->tcp_closed_timestamp)
                        {
                          if (now >= s->tcp_closed_timestamp)
                            {
                              ++transitory_closed;
                            }
                          else
                            {
                              ++transitory_wait_closed;
                            }
                        }
                      transitory++;
                    }
                  else
                    established++;
                  break;
                case NAT_PROTOCOL_UDP:
                default:
                  udp_sessions++;
                  break;
                }
            }
            nat44_show_lru_summary (vm, tsm, now, sess_timeout_time);
            count += pool_elts (tsm->sessions);
          }
        /* *INDENT-ON* */
      }
    else
      {
        tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
        /* *INDENT-OFF* */
        pool_foreach (s, tsm->sessions)
         {
          sess_timeout_time = s->last_heard +
  	    (f64) nat44_session_get_timeout (sm, s);
          if (now >= sess_timeout_time)
            timed_out++;
  
          switch (s->nat_proto)
            {
            case NAT_PROTOCOL_ICMP:
              icmp_sessions++;
              break;
            case NAT_PROTOCOL_TCP:
              tcp_sessions++;
              if (s->state)
                {
                  if (s->tcp_closed_timestamp)
                    {
                      if (now >= s->tcp_closed_timestamp)
                        {
                          ++transitory_closed;
                        }
                      else
                        {
                          ++transitory_wait_closed;
                        }
                    }
                  transitory++;
                }
              else
                established++;
              break;
            case NAT_PROTOCOL_UDP:
            default:
              udp_sessions++;
              break;
            }
        }
        /* *INDENT-ON* */
        nat44_show_lru_summary (vm, tsm, now, sess_timeout_time);
        count = pool_elts (tsm->sessions);
      }
  
    vlib_cli_output (vm, "total timed out sessions: %u", timed_out);
    vlib_cli_output (vm, "total sessions: %u", count);
    vlib_cli_output (vm, "total tcp sessions: %u", tcp_sessions);
    vlib_cli_output (vm, "total tcp established sessions: %u", established);
    vlib_cli_output (vm, "total tcp transitory sessions: %u", transitory);
    vlib_cli_output (vm, "total tcp transitory (WAIT-CLOSED) sessions: %u",
  		   transitory_wait_closed);
    vlib_cli_output (vm, "total tcp transitory (CLOSED) sessions: %u",
  		   transitory_closed);
    vlib_cli_output (vm, "total udp sessions: %u", udp_sessions);
    vlib_cli_output (vm, "total icmp sessions: %u", icmp_sessions);
    return 0;
  }
  
  static clib_error_t *
  nat44_show_addresses_command_fn (vlib_main_t * vm, unformat_input_t * input,
  				 vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    snat_address_t *ap;
  
    vlib_cli_output (vm, "NAT44 pool addresses:");
    /* *INDENT-OFF* */
    vec_foreach (ap, sm->addresses)
      {
        vlib_cli_output (vm, "%U", format_ip4_address, &ap->addr);
        if (ap->fib_index != ~0)
            vlib_cli_output (vm, "  tenant VRF: %u",
              fib_table_get(ap->fib_index, FIB_PROTOCOL_IP4)->ft_table_id);
        else
          vlib_cli_output (vm, "  tenant VRF independent");
      #define _(N, i, n, s) \
        vlib_cli_output (vm, "  %d busy %s ports", ap->busy_##n##_ports, s);
        foreach_nat_protocol
      #undef _
      }
    vlib_cli_output (vm, "NAT44 twice-nat pool addresses:");
    vec_foreach (ap, sm->twice_nat_addresses)
      {
        vlib_cli_output (vm, "%U", format_ip4_address, &ap->addr);
        if (ap->fib_index != ~0)
            vlib_cli_output (vm, "  tenant VRF: %u",
              fib_table_get(ap->fib_index, FIB_PROTOCOL_IP4)->ft_table_id);
        else
          vlib_cli_output (vm, "  tenant VRF independent");
      #define _(N, i, n, s) \
        vlib_cli_output (vm, "  %d busy %s ports", ap->busy_##n##_ports, s);
        foreach_nat_protocol
      #undef _
      }
    /* *INDENT-ON* */
    return 0;
  }
  
  static clib_error_t *
  snat_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_output_feature = 0;
    int is_del = 0;
    int i;
  
    sw_if_index = ~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, "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, "output-feature"))
  	is_output_feature = 1;
        else if (unformat (line_input, "del"))
  	is_del = 1;
        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];
  	  if (is_output_feature)
  	    {
  	      if (snat_interface_add_del_output_feature
  		  (sw_if_index, 1, is_del))
  		{
  		  error = clib_error_return (0, "%s %U failed",
  					     is_del ? "del" : "add",
  					     format_vnet_sw_if_index_name,
  					     vnm, sw_if_index);
  		  goto done;
  		}
  	    }
  	  else
  	    {
  	      if (snat_interface_add_del (sw_if_index, 1, is_del))
  		{
  		  error = clib_error_return (0, "%s %U failed",
  					     is_del ? "del" : "add",
  					     format_vnet_sw_if_index_name,
  					     vnm, sw_if_index);
  		  goto done;
  		}
  	    }
  	}
      }
  
    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];
  	  if (is_output_feature)
  	    {
  	      if (snat_interface_add_del_output_feature
  		  (sw_if_index, 0, is_del))
  		{
  		  error = clib_error_return (0, "%s %U failed",
  					     is_del ? "del" : "add",
  					     format_vnet_sw_if_index_name,
  					     vnm, sw_if_index);
  		  goto done;
  		}
  	    }
  	  else
  	    {
  	      if (snat_interface_add_del (sw_if_index, 0, is_del))
  		{
  		  error = clib_error_return (0, "%s %U failed",
  					     is_del ? "del" : "add",
  					     format_vnet_sw_if_index_name,
  					     vnm, sw_if_index);
  		  goto done;
  		}
  	    }
  	}
      }
  
  done:
    unformat_free (line_input);
    vec_free (inside_sw_if_indices);
    vec_free (outside_sw_if_indices);
  
    return error;
  }
  
  static clib_error_t *
  nat44_show_interfaces_command_fn (vlib_main_t * vm, unformat_input_t * input,
  				  vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    snat_interface_t *i;
    vnet_main_t *vnm = vnet_get_main ();
  
    vlib_cli_output (vm, "NAT44 interfaces:");
    /* *INDENT-OFF* */
    pool_foreach (i, sm->interfaces)
     {
      vlib_cli_output (vm, " %U %s", format_vnet_sw_if_index_name, vnm,
                       i->sw_if_index,
                       (nat_interface_is_inside(i) &&
                        nat_interface_is_outside(i)) ? "in out" :
                       (nat_interface_is_inside(i) ? "in" : "out"));
    }
  
    pool_foreach (i, sm->output_feature_interfaces)
     {
      vlib_cli_output (vm, " %U output-feature %s",
                       format_vnet_sw_if_index_name, vnm,
                       i->sw_if_index,
                       (nat_interface_is_inside(i) &&
                        nat_interface_is_outside(i)) ? "in out" :
                       (nat_interface_is_inside(i) ? "in" : "out"));
    }
    /* *INDENT-ON* */
  
    return 0;
  }
  
  static clib_error_t *
  add_static_mapping_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;
    ip4_address_t l_addr, e_addr, exact_addr;
    u32 l_port = 0, e_port = 0, vrf_id = ~0;
    int is_add = 1, addr_only = 1, rv, exact = 0;
    u32 sw_if_index = ~0;
    vnet_main_t *vnm = vnet_get_main ();
    nat_protocol_t proto = NAT_PROTOCOL_OTHER;
    u8 proto_set = 0;
    twice_nat_type_t twice_nat = TWICE_NAT_DISABLED;
    u8 out2in_only = 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, "local %U %u", unformat_ip4_address, &l_addr,
  		    &l_port))
  	addr_only = 0;
        else
  	if (unformat (line_input, "local %U", unformat_ip4_address, &l_addr))
  	;
        else if (unformat (line_input, "external %U %u", unformat_ip4_address,
  			 &e_addr, &e_port))
  	addr_only = 0;
        else if (unformat (line_input, "external %U", unformat_ip4_address,
  			 &e_addr))
  	;
        else if (unformat (line_input, "external %U %u",
  			 unformat_vnet_sw_interface, vnm, &sw_if_index,
  			 &e_port))
  	addr_only = 0;
        else if (unformat (line_input, "external %U",
  			 unformat_vnet_sw_interface, vnm, &sw_if_index))
  	;
        else if (unformat (line_input, "exact %U", unformat_ip4_address,
  			 &exact_addr))
  	exact = 1;
        else if (unformat (line_input, "vrf %u", &vrf_id))
  	;
        else if (unformat (line_input, "%U", unformat_nat_protocol, &proto))
  	proto_set = 1;
        else if (unformat (line_input, "twice-nat"))
  	twice_nat = TWICE_NAT;
        else if (unformat (line_input, "self-twice-nat"))
  	twice_nat = TWICE_NAT_SELF;
        else if (unformat (line_input, "out2in-only"))
  	out2in_only = 1;
        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 (twice_nat && addr_only)
      {
        error = clib_error_return (0, "twice NAT only for 1:1 NAPT");
        goto done;
      }
  
    if (addr_only)
      {
        if (proto_set)
  	{
  	  error =
  	    clib_error_return (0,
  			       "address only mapping doesn't support protocol");
  	  goto done;
  	}
      }
    else if (!proto_set)
      {
        error = clib_error_return (0, "protocol is required");
        goto done;
      }
  
    rv = snat_add_static_mapping (
      l_addr, e_addr, clib_host_to_net_u16 (l_port),
      clib_host_to_net_u16 (e_port), vrf_id, addr_only, sw_if_index, proto,
      is_add, twice_nat, out2in_only, 0, 0, exact_addr, exact);
  
    switch (rv)
      {
      case VNET_API_ERROR_INVALID_VALUE:
        error = clib_error_return (0, "External port already in use.");
        goto done;
      case VNET_API_ERROR_NO_SUCH_ENTRY:
        if (is_add)
  	error = clib_error_return (0, "External address must be allocated.");
        else
  	error = clib_error_return (0, "Mapping not exist.");
        goto done;
      case VNET_API_ERROR_NO_SUCH_FIB:
        error = clib_error_return (0, "No such VRF id.");
        goto done;
      case VNET_API_ERROR_VALUE_EXIST:
        error = clib_error_return (0, "Mapping already exist.");
        goto done;
      case VNET_API_ERROR_FEATURE_DISABLED:
        error =
  	clib_error_return (0,
  			   "twice-nat/out2in-only available only for endpoint-dependent mode.");
        goto done;
      default:
        break;
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  add_identity_mapping_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;
    ip4_address_t addr, pool_addr = { 0 };
    u32 port = 0, vrf_id = ~0;
    int is_add = 1;
    int addr_only = 1;
    u32 sw_if_index = ~0;
    vnet_main_t *vnm = vnet_get_main ();
    int rv;
    nat_protocol_t proto;
  
    addr.as_u32 = 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_ip4_address, &addr))
  	;
        else if (unformat (line_input, "external %U",
  			 unformat_vnet_sw_interface, vnm, &sw_if_index))
  	;
        else if (unformat (line_input, "vrf %u", &vrf_id))
  	;
        else if (unformat (line_input, "%U %u", unformat_nat_protocol, &proto,
  			 &port))
  	addr_only = 0;
        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 = snat_add_static_mapping (
      addr, addr, clib_host_to_net_u16 (port), clib_host_to_net_u16 (port),
      vrf_id, addr_only, sw_if_index, proto, is_add, 0, 0, 0, 1, pool_addr, 0);
  
    switch (rv)
      {
      case VNET_API_ERROR_INVALID_VALUE:
        error = clib_error_return (0, "External port already in use.");
        goto done;
      case VNET_API_ERROR_NO_SUCH_ENTRY:
        if (is_add)
  	error = clib_error_return (0, "External address must be allocated.");
        else
  	error = clib_error_return (0, "Mapping not exist.");
        goto done;
      case VNET_API_ERROR_NO_SUCH_FIB:
        error = clib_error_return (0, "No such VRF id.");
        goto done;
      case VNET_API_ERROR_VALUE_EXIST:
        error = clib_error_return (0, "Mapping already exist.");
        goto done;
      default:
        break;
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  add_lb_static_mapping_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;
    ip4_address_t l_addr, e_addr;
    u32 l_port = 0, e_port = 0, vrf_id = 0, probability = 0, affinity = 0;
    int is_add = 1;
    int rv;
    nat_protocol_t proto;
    u8 proto_set = 0;
    nat44_lb_addr_port_t *locals = 0, local;
    twice_nat_type_t twice_nat = TWICE_NAT_DISABLED;
    u8 out2in_only = 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, "local %U:%u probability %u",
  		    unformat_ip4_address, &l_addr, &l_port, &probability))
  	{
  	  clib_memset (&local, 0, sizeof (local));
  	  local.addr = l_addr;
  	  local.port = (u16) l_port;
  	  local.probability = (u8) probability;
  	  vec_add1 (locals, local);
  	}
        else if (unformat (line_input, "local %U:%u vrf %u probability %u",
  			 unformat_ip4_address, &l_addr, &l_port, &vrf_id,
  			 &probability))
  	{
  	  clib_memset (&local, 0, sizeof (local));
  	  local.addr = l_addr;
  	  local.port = (u16) l_port;
  	  local.probability = (u8) probability;
  	  local.vrf_id = vrf_id;
  	  vec_add1 (locals, local);
  	}
        else if (unformat (line_input, "external %U:%u", unformat_ip4_address,
  			 &e_addr, &e_port))
  	;
        else if (unformat (line_input, "protocol %U", unformat_nat_protocol,
  			 &proto))
  	proto_set = 1;
        else if (unformat (line_input, "twice-nat"))
  	twice_nat = TWICE_NAT;
        else if (unformat (line_input, "self-twice-nat"))
  	twice_nat = TWICE_NAT_SELF;
        else if (unformat (line_input, "out2in-only"))
  	out2in_only = 1;
        else if (unformat (line_input, "del"))
  	is_add = 0;
        else if (unformat (line_input, "affinity %u", &affinity))
  	;
        else
  	{
  	  error = clib_error_return (0, "unknown input: '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    if (vec_len (locals) < 2)
      {
        error = clib_error_return (0, "at least two local must be set");
        goto done;
      }
  
    if (!proto_set)
      {
        error = clib_error_return (0, "missing protocol");
        goto done;
      }
  
    rv = nat44_add_del_lb_static_mapping (e_addr, (u16) e_port, proto, locals,
  					is_add, twice_nat, out2in_only, 0,
  					affinity);
  
    switch (rv)
      {
      case VNET_API_ERROR_INVALID_VALUE:
        error = clib_error_return (0, "External port already in use.");
        goto done;
      case VNET_API_ERROR_NO_SUCH_ENTRY:
        if (is_add)
  	error = clib_error_return (0, "External address must be allocated.");
        else
  	error = clib_error_return (0, "Mapping not exist.");
        goto done;
      case VNET_API_ERROR_VALUE_EXIST:
        error = clib_error_return (0, "Mapping already exist.");
        goto done;
      case VNET_API_ERROR_FEATURE_DISABLED:
        error =
  	clib_error_return (0, "Available only for endpoint-dependent mode.");
        goto done;
      default:
        break;
      }
  
  done:
    unformat_free (line_input);
    vec_free (locals);
  
    return error;
  }
  
  static clib_error_t *
  add_lb_backend_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;
    ip4_address_t l_addr, e_addr;
    u32 l_port = 0, e_port = 0, vrf_id = 0, probability = 0;
    int is_add = 1;
    int rv;
    nat_protocol_t proto;
    u8 proto_set = 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, "local %U:%u probability %u",
  		    unformat_ip4_address, &l_addr, &l_port, &probability))
  	;
        else if (unformat (line_input, "local %U:%u vrf %u probability %u",
  			 unformat_ip4_address, &l_addr, &l_port, &vrf_id,
  			 &probability))
  	;
        else if (unformat (line_input, "external %U:%u", unformat_ip4_address,
  			 &e_addr, &e_port))
  	;
        else if (unformat (line_input, "protocol %U", unformat_nat_protocol,
  			 &proto))
  	proto_set = 1;
        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 (!l_port || !e_port)
      {
        error = clib_error_return (0, "local or external must be set");
        goto done;
      }
  
    if (!proto_set)
      {
        error = clib_error_return (0, "missing protocol");
        goto done;
      }
  
    rv =
      nat44_lb_static_mapping_add_del_local (e_addr, (u16) e_port, l_addr,
  					   l_port, proto, vrf_id, probability,
  					   is_add);
  
    switch (rv)
      {
      case VNET_API_ERROR_INVALID_VALUE:
        error = clib_error_return (0, "External is not load-balancing static "
  				 "mapping.");
        goto done;
      case VNET_API_ERROR_NO_SUCH_ENTRY:
        error = clib_error_return (0, "Mapping or back-end not exist.");
        goto done;
      case VNET_API_ERROR_VALUE_EXIST:
        error = clib_error_return (0, "Back-end already exist.");
        goto done;
      case VNET_API_ERROR_FEATURE_DISABLED:
        error =
  	clib_error_return (0, "Available only for endpoint-dependent mode.");
        goto done;
      case VNET_API_ERROR_UNSPECIFIED:
        error = clib_error_return (0, "At least two back-ends must remain");
        goto done;
      default:
        break;
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  nat44_show_static_mappings_command_fn (vlib_main_t * vm,
  				       unformat_input_t * input,
  				       vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    snat_static_mapping_t *m;
    snat_static_map_resolve_t *rp;
  
    vlib_cli_output (vm, "NAT44 static mappings:");
    /* *INDENT-OFF* */
    pool_foreach (m, sm->static_mappings)
     {
      vlib_cli_output (vm, " %U", format_snat_static_mapping, m);
    }
    vec_foreach (rp, sm->to_resolve)
      vlib_cli_output (vm, " %U", format_snat_static_map_to_resolve, rp);
    /* *INDENT-ON* */
  
    return 0;
  }
  
  static clib_error_t *
  snat_add_interface_address_command_fn (vlib_main_t * vm,
  				       unformat_input_t * input,
  				       vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    unformat_input_t _line_input, *line_input = &_line_input;
    u32 sw_if_index;
    int rv;
    int is_del = 0;
    clib_error_t *error = 0;
    u8 twice_nat = 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,
  		    sm->vnet_main, &sw_if_index))
  	;
        else if (unformat (line_input, "twice-nat"))
  	twice_nat = 1;
        else if (unformat (line_input, "del"))
  	is_del = 1;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    rv = snat_add_interface_address (sm, sw_if_index, is_del, twice_nat);
  
    switch (rv)
      {
      case 0:
        break;
  
      default:
        error = clib_error_return (0, "snat_add_interface_address returned %d",
  				 rv);
        goto done;
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  nat44_show_interface_address_command_fn (vlib_main_t * vm,
  					 unformat_input_t * input,
  					 vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    vnet_main_t *vnm = vnet_get_main ();
    u32 *sw_if_index;
  
    /* *INDENT-OFF* */
    vlib_cli_output (vm, "NAT44 pool address interfaces:");
    vec_foreach (sw_if_index, sm->auto_add_sw_if_indices)
      {
        vlib_cli_output (vm, " %U", format_vnet_sw_if_index_name, vnm,
                         *sw_if_index);
      }
    vlib_cli_output (vm, "NAT44 twice-nat pool address interfaces:");
    vec_foreach (sw_if_index, sm->auto_add_sw_if_indices_twice_nat)
      {
        vlib_cli_output (vm, " %U", format_vnet_sw_if_index_name, vnm,
                         *sw_if_index);
      }
    /* *INDENT-ON* */
  
    return 0;
  }
  
  static clib_error_t *
  nat44_show_sessions_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;
  
    snat_main_per_thread_data_t *tsm;
    snat_main_t *sm = &snat_main;
  
    int detail = 0;
    int i = 0;
  
    if (!unformat_user (input, unformat_line_input, line_input))
      goto print;
  
    while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
      {
        if (unformat (line_input, "detail"))
  	detail = 1;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  break;
  	}
      }
    unformat_free (line_input);
  
  print:
    if (!sm->endpoint_dependent)
      vlib_cli_output (vm, "NAT44 sessions:");
    else
      vlib_cli_output (vm, "NAT44 ED sessions:");
  
    /* *INDENT-OFF* */
    vec_foreach_index (i, sm->per_thread_data)
      {
        tsm = vec_elt_at_index (sm->per_thread_data, i);
  
        vlib_cli_output (vm, "-------- thread %d %s: %d sessions --------\n",
                         i, vlib_worker_threads[i].name,
                         pool_elts (tsm->sessions));
  
        if (!sm->endpoint_dependent)
          {
            snat_user_t *u;
            pool_foreach (u, tsm->users)
             {
              vlib_cli_output (vm, "  %U", format_snat_user, tsm, u, detail);
            }
          }
        else
          {
            snat_session_t *s;
            pool_foreach (s, tsm->sessions)
             {
              vlib_cli_output (vm, "  %U\n", format_snat_session, tsm, s);
            }
          }
      }
    /* *INDENT-ON* */
    return error;
  }
  
  static clib_error_t *
  nat44_set_session_limit_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;
  
    u32 session_limit = 0, vrf_id = 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", &session_limit))
  	;
        else if (unformat (line_input, "vrf %u", &vrf_id))
  	;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    if (!session_limit)
      error = clib_error_return (0, "missing value of session limit");
    else if (nat44_update_session_limit (session_limit, vrf_id))
      error = clib_error_return (0, "nat44_set_session_limit failed");
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  nat44_del_user_command_fn (vlib_main_t * vm,
  			   unformat_input_t * input, vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    unformat_input_t _line_input, *line_input = &_line_input;
    clib_error_t *error = 0;
    ip4_address_t addr;
    u32 fib_index = 0;
    int rv;
  
    if (sm->endpoint_dependent)
      return clib_error_return (0, UNSUPPORTED_IN_ED_MODE_STR);
  
    /* 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_ip4_address, &addr))
  	;
        else if (unformat (line_input, "fib %u", &fib_index))
  	;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    rv = nat44_ei_user_del (&addr, fib_index);
  
    if (!rv)
      {
        error = clib_error_return (0, "nat44_ei_user_del returned %d", rv);
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  nat44_clear_sessions_command_fn (vlib_main_t * vm,
  				 unformat_input_t * input,
  				 vlib_cli_command_t * cmd)
  {
    clib_error_t *error = 0;
    nat44_sessions_clear ();
    return error;
  }
  
  static clib_error_t *
  nat44_del_session_command_fn (vlib_main_t * vm,
  			      unformat_input_t * input,
  			      vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    unformat_input_t _line_input, *line_input = &_line_input;
    int is_in = 0, is_ed = 0;
    clib_error_t *error = 0;
    ip4_address_t addr, eh_addr;
    u32 port = 0, eh_port = 0, vrf_id = sm->outside_vrf_id;
    nat_protocol_t proto;
    int 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, "%U:%u %U", unformat_ip4_address, &addr, &port,
  	   unformat_nat_protocol, &proto))
  	;
        else if (unformat (line_input, "in"))
  	{
  	  is_in = 1;
  	  vrf_id = sm->inside_vrf_id;
  	}
        else if (unformat (line_input, "out"))
  	{
  	  is_in = 0;
  	  vrf_id = sm->outside_vrf_id;
  	}
        else if (unformat (line_input, "vrf %u", &vrf_id))
  	;
        else
  	if (unformat
  	    (line_input, "external-host %U:%u", unformat_ip4_address,
  	     &eh_addr, &eh_port))
  	is_ed = 1;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    if (is_ed)
      rv =
        nat44_del_ed_session (sm, &addr, clib_host_to_net_u16 (port), &eh_addr,
  			    clib_host_to_net_u16 (eh_port),
  			    nat_proto_to_ip_proto (proto), vrf_id, is_in);
    else
      rv = nat44_ei_del_session (sm, &addr, clib_host_to_net_u16 (port), proto,
  			       vrf_id, is_in);
  
    switch (rv)
      {
      case 0:
        break;
  
      default:
        error = clib_error_return (0, "nat44_del_session returned %d", rv);
        goto done;
      }
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  snat_forwarding_set_command_fn (vlib_main_t * vm,
  				unformat_input_t * input,
  				vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    unformat_input_t _line_input, *line_input = &_line_input;
    u8 forwarding_enable;
    u8 forwarding_enable_set = 0;
    clib_error_t *error = 0;
  
    /* Get a line of input. */
    if (!unformat_user (input, unformat_line_input, line_input))
      return clib_error_return (0, "'enable' or 'disable' expected");
  
    while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
      {
        if (!forwarding_enable_set && unformat (line_input, "enable"))
  	{
  	  forwarding_enable = 1;
  	  forwarding_enable_set = 1;
  	}
        else if (!forwarding_enable_set && unformat (line_input, "disable"))
  	{
  	  forwarding_enable = 0;
  	  forwarding_enable_set = 1;
  	}
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  
    if (!forwarding_enable_set)
      {
        error = clib_error_return (0, "'enable' or 'disable' expected");
        goto done;
      }
  
    sm->forwarding_enabled = forwarding_enable;
  
  done:
    unformat_free (line_input);
  
    return error;
  }
  
  static clib_error_t *
  set_timeout_command_fn (vlib_main_t * vm,
  			unformat_input_t * input, vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    unformat_input_t _line_input, *line_input = &_line_input;
    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, "udp %u", &sm->timeouts.udp));
        else if (unformat (line_input, "tcp-established %u",
  			 &sm->timeouts.tcp.established));
        else if (unformat (line_input, "tcp-transitory %u",
  			 &sm->timeouts.tcp.transitory));
        else if (unformat (line_input, "icmp %u", &sm->timeouts.icmp));
        else if (unformat (line_input, "reset"))
  	nat_reset_timeouts (&sm->timeouts);
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
  done:
    unformat_free (line_input);
    return error;
  }
  
  static clib_error_t *
  nat_show_timeouts_command_fn (vlib_main_t * vm,
  			      unformat_input_t * input,
  			      vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
  
    vlib_cli_output (vm, "udp timeout: %dsec", sm->timeouts.udp);
    vlib_cli_output (vm, "tcp-established timeout: %dsec",
  		   sm->timeouts.tcp.established);
    vlib_cli_output (vm, "tcp-transitory timeout: %dsec",
  		   sm->timeouts.tcp.transitory);
    vlib_cli_output (vm, "icmp timeout: %dsec", sm->timeouts.icmp);
  
    return 0;
  }
  
  static clib_error_t *
  nat44_debug_fib_expire_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;
    u32 fib = ~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", &fib))
  	;
        else
  	{
  	  error = clib_error_return (0, "unknown input '%U'",
  				     format_unformat_error, line_input);
  	  goto done;
  	}
      }
    expire_per_vrf_sessions (fib);
  done:
    unformat_free (line_input);
    return error;
  }
  
  static clib_error_t *
  nat44_debug_fib_registration_command_fn (vlib_main_t * vm,
  					 unformat_input_t * input,
  					 vlib_cli_command_t * cmd)
  {
    snat_main_t *sm = &snat_main;
    snat_main_per_thread_data_t *tsm;
    per_vrf_sessions_t *per_vrf_sessions;
  
    vlib_cli_output (vm, "VRF registration debug:");
    vec_foreach (tsm, sm->per_thread_data)
    {
      vlib_cli_output (vm, "thread %u:", tsm->thread_index);
      vec_foreach (per_vrf_sessions, tsm->per_vrf_sessions_vec)
      {
        vlib_cli_output (vm, "rx fib %u tx fib %u ses count %u %s",
  		       per_vrf_sessions->rx_fib_index,
  		       per_vrf_sessions->tx_fib_index,
  		       per_vrf_sessions->ses_count,
  		       per_vrf_sessions->expired ? "expired" : "");
      }
    }
    return 0;
  }
  
  /* *INDENT-OFF* */
  
  /*?
  ?*/
  VLIB_CLI_COMMAND (nat44_debug_fib_expire_command, static) = {
    .path = "debug nat44 fib expire",
    .short_help = "debug nat44 fib expire <fib-index>",
    .function = nat44_debug_fib_expire_command_fn,
  };
  
  /*?
  ?*/
  VLIB_CLI_COMMAND (nat44_debug_fib_registration_command, static) = {
    .path = "debug nat44 fib registration",
    .short_help = "debug nat44 fib registration",
    .function = nat44_debug_fib_registration_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 enable}
   * Enable nat44 plugin
   * To enable nat44, use:
   *  vpp# nat44 enable sessions <n>
   * To enable nat44 static mapping only, use:
   *  vpp# nat44 enable sessions <n> static-mapping
   * To enable nat44 static mapping with connection tracking, use:
   *  vpp# nat44 enable sessions <n> static-mapping connection-tracking
   * To enable nat44 out2in dpo, use:
   *  vpp# nat44 enable sessions <n> out2in-dpo
   * To enable nat44 endpoint-dependent, use:
   *  vpp# nat44 enable sessions <n> endpoint-dependent
   * To set inside-vrf outside-vrf, use:
   *  vpp# nat44 enable sessions <n> inside-vrf <id> outside-vrf <id>
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_enable_command, static) = {
    .path = "nat44 enable",
    .short_help = "nat44 enable sessions <max-number> [users <max-number>] [static-mappig-only [connection-tracking]|out2in-dpo|endpoint-dependent] [inside-vrf <vrf-id>] [outside-vrf <vrf-id>] [user-sessions <max-number>]",
    .function = nat44_enable_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 disable}
   * Disable nat44 plugin
   * To disable nat44, use:
   *  vpp# nat44 disable
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_disable_command, static) = {
    .path = "nat44 disable",
    .short_help = "nat44 disable",
    .function = nat44_disable_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{set snat workers}
   * Set NAT workers if 2 or more workers available, use:
   *  vpp# set snat workers 0-2,5
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (set_workers_command, static) = {
    .path = "set nat workers",
    .function = set_workers_command_fn,
    .short_help = "set nat workers <workers-list>",
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat workers}
   * Show NAT workers.
   *  vpp# show nat workers:
   *  2 workers
   *    vpp_wk_0
   *    vpp_wk_1
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat_show_workers_command, static) = {
    .path = "show nat workers",
    .short_help = "show nat workers",
    .function = nat_show_workers_commnad_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{set nat timeout}
   * Set values of timeouts for NAT sessions (in seconds), use:
   *  vpp# set nat timeout udp 120 tcp-established 7500 tcp-transitory 250 icmp 90
   * To reset default values use:
   *  vpp# set nat timeout reset
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (set_timeout_command, static) = {
    .path = "set nat timeout",
    .function = set_timeout_command_fn,
    .short_help =
      "set nat timeout [udp <sec> | tcp-established <sec> "
      "tcp-transitory <sec> | icmp <sec> | reset]",
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat timeouts}
   * Show values of timeouts for NAT sessions.
   * vpp# show nat timeouts
   * udp timeout: 300sec
   * tcp-established timeout: 7440sec
   * tcp-transitory timeout: 240sec
   * icmp timeout: 60sec
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat_show_timeouts_command, static) = {
    .path = "show nat timeouts",
    .short_help = "show nat timeouts",
    .function = nat_show_timeouts_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat set logging level}
   * To set NAT logging level use:
   * Set nat logging level
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (snat_set_log_level_command, static) = {
    .path = "nat set logging level",
    .function = snat_set_log_level_command_fn,
    .short_help = "nat set logging level <level>",
  };
  
  /*?
   * @cliexpar
   * @cliexstart{snat ipfix logging}
   * To enable NAT IPFIX logging use:
   *  vpp# nat ipfix logging
   * To set IPFIX exporter use:
   *  vpp# set ipfix exporter collector 10.10.10.3 src 10.10.10.1
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (snat_ipfix_logging_enable_disable_command, static) = {
    .path = "nat ipfix logging",
    .function = snat_ipfix_logging_enable_disable_command_fn,
    .short_help = "nat ipfix logging [domain <domain-id>] [src-port <port>] [disable]",
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat addr-port-assignment-alg}
   * Set address and port assignment algorithm
   * For the MAP-E CE limit port choice based on PSID use:
   *  vpp# nat addr-port-assignment-alg map-e psid 10 psid-offset 6 psid-len 6
   * For port range use:
   *  vpp# nat addr-port-assignment-alg port-range <start-port> - <end-port>
   * To set standard (default) address and port assignment algorithm use:
   *  vpp# nat addr-port-assignment-alg default
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_set_alloc_addr_and_port_alg_command, static) = {
      .path = "nat addr-port-assignment-alg",
      .short_help = "nat addr-port-assignment-alg <alg-name> [<alg-params>]",
      .function = nat44_set_alloc_addr_and_port_alg_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat addr-port-assignment-alg}
   * Show address and port assignment algorithm
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_show_alloc_addr_and_port_alg_command, static) = {
      .path = "show nat addr-port-assignment-alg",
      .short_help = "show nat addr-port-assignment-alg",
      .function = nat44_show_alloc_addr_and_port_alg_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat mss-clamping}
   * Set TCP MSS rewriting configuration
   * To enable TCP MSS rewriting use:
   *  vpp# nat mss-clamping 1452
   * To disbale TCP MSS rewriting use:
   *  vpp# nat mss-clamping disable
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat_set_mss_clamping_command, static) = {
      .path = "nat mss-clamping",
      .short_help = "nat mss-clamping <mss-value>|disable",
      .function = nat_set_mss_clamping_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat mss-clamping}
   * Show TCP MSS rewriting configuration
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat_show_mss_clamping_command, static) = {
      .path = "show nat mss-clamping",
      .short_help = "show nat mss-clamping",
      .function = nat_show_mss_clamping_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat ha failover}
   * Set HA failover (remote settings)
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat_ha_failover_command, static) = {
      .path = "nat ha failover",
      .short_help = "nat ha failover <ip4-address>:<port> [refresh-interval <sec>]",
      .function = nat_ha_failover_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat ha listener}
   * Set HA listener (local settings)
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat_ha_listener_command, static) = {
      .path = "nat ha listener",
      .short_help = "nat ha listener <ip4-address>:<port> [path-mtu <path-mtu>]",
      .function = nat_ha_listener_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat ha}
   * Show HA configuration/status
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat_show_ha_command, static) = {
      .path = "show nat ha",
      .short_help = "show nat ha",
      .function = nat_show_ha_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat ha flush}
   * Flush the current HA data (for testing)
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat_ha_flush_command, static) = {
      .path = "nat ha flush",
      .short_help = "nat ha flush",
      .function = nat_ha_flush_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat ha resync}
   * Resync HA (resend existing sessions to new failover)
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat_ha_resync_command, static) = {
      .path = "nat ha resync",
      .short_help = "nat ha resync",
      .function = nat_ha_resync_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat44 hash tables}
   * Show NAT44 hash tables
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_show_hash, static) = {
    .path = "show nat44 hash tables",
    .short_help = "show nat44 hash tables [detail|verbose]",
    .function = nat44_show_hash_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 add address}
   * Add/delete NAT44 pool address.
   * To add NAT44 pool address use:
   *  vpp# nat44 add address 172.16.1.3
   *  vpp# nat44 add address 172.16.2.2 - 172.16.2.24
   * To add NAT44 pool address for specific tenant (identified by VRF id) use:
   *  vpp# nat44 add address 172.16.1.3 tenant-vrf 10
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (add_address_command, static) = {
    .path = "nat44 add address",
    .short_help = "nat44 add address <ip4-range-start> [- <ip4-range-end>] "
                  "[tenant-vrf <vrf-id>] [twice-nat] [del]",
    .function = add_address_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat44 summary}
   * Show NAT44 summary
   * vpp# show nat44 summary
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_show_summary_command, static) = {
    .path = "show nat44 summary",
    .short_help = "show nat44 summary",
    .function = nat44_show_summary_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat44 addresses}
   * Show NAT44 pool addresses.
   * vpp# show nat44 addresses
   * NAT44 pool addresses:
   * 172.16.2.2
   *   tenant VRF independent
   *   10 busy udp ports
   *   0 busy tcp ports
   *   0 busy icmp ports
   * 172.16.1.3
   *   tenant VRF: 10
   *   0 busy udp ports
   *   2 busy tcp ports
   *   0 busy icmp ports
   * NAT44 twice-nat pool addresses:
   * 10.20.30.72
   *   tenant VRF independent
   *   0 busy udp ports
   *   0 busy tcp ports
   *   0 busy icmp ports
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_show_addresses_command, static) = {
    .path = "show nat44 addresses",
    .short_help = "show nat44 addresses",
    .function = nat44_show_addresses_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{set interface nat44}
   * Enable/disable NAT44 feature on the interface.
   * To enable NAT44 feature with local network interface use:
   *  vpp# set interface nat44 in GigabitEthernet0/8/0
   * To enable NAT44 feature with external network interface use:
   *  vpp# set interface nat44 out GigabitEthernet0/a/0
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (set_interface_snat_command, static) = {
    .path = "set interface nat44",
    .function = snat_feature_command_fn,
    .short_help = "set interface nat44 in <intfc> out <intfc> [output-feature] "
                  "[del]",
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat44 interfaces}
   * Show interfaces with NAT44 feature.
   * vpp# show nat44 interfaces
   * NAT44 interfaces:
   *  GigabitEthernet0/8/0 in
   *  GigabitEthernet0/a/0 out
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_show_interfaces_command, static) = {
    .path = "show nat44 interfaces",
    .short_help = "show nat44 interfaces",
    .function = nat44_show_interfaces_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 add static mapping}
   * Static mapping allows hosts on the external network to initiate connection
   * to to the local network host.
   * To create static mapping between local host address 10.0.0.3 port 6303 and
   * external address 4.4.4.4 port 3606 for TCP protocol use:
   *  vpp# nat44 add static mapping tcp local 10.0.0.3 6303 external 4.4.4.4 3606
   * If not runnig "static mapping only" NAT plugin mode use before:
   *  vpp# nat44 add address 4.4.4.4
   * To create address only static mapping between local and external address use:
   *  vpp# nat44 add static mapping local 10.0.0.3 external 4.4.4.4
   * To create ICMP static mapping between local and external with ICMP echo
   * identifier 10 use:
   *  vpp# nat44 add static mapping icmp local 10.0.0.3 10 external 4.4.4.4 10
   * To force use of specific pool address, vrf independent
   *  vpp# nat44 add static mapping local 10.0.0.2 1234 external 10.0.2.2 1234 twice-nat exact 10.0.1.2
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (add_static_mapping_command, static) = {
    .path = "nat44 add static mapping",
    .function = add_static_mapping_command_fn,
    .short_help =
      "nat44 add static mapping tcp|udp|icmp local <addr> [<port|icmp-echo-id>] "
      "external <addr> [<port|icmp-echo-id>] [vrf <table-id>] [twice-nat|self-twice-nat] "
      "[out2in-only] [exact <pool-addr>] [del]",
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 add identity mapping}
   * Identity mapping translate an IP address to itself.
   * To create identity mapping for address 10.0.0.3 port 6303 for TCP protocol
   * use:
   *  vpp# nat44 add identity mapping 10.0.0.3 tcp 6303
   * To create identity mapping for address 10.0.0.3 use:
   *  vpp# nat44 add identity mapping 10.0.0.3
   * To create identity mapping for DHCP addressed interface use:
   *  vpp# nat44 add identity mapping external GigabitEthernet0/a/0 tcp 3606
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (add_identity_mapping_command, static) = {
    .path = "nat44 add identity mapping",
    .function = add_identity_mapping_command_fn,
    .short_help = "nat44 add identity mapping <ip4-addr>|external <interface> "
      "[<protocol> <port>] [vrf <table-id>] [del]",
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 add load-balancing static mapping}
   * Service load balancing using NAT44
   * To add static mapping with load balancing for service with external IP
   * address 1.2.3.4 and TCP port 80 and mapped to 2 local servers
   * 10.100.10.10:8080 and 10.100.10.20:8080 with probability 80% resp. 20% use:
   *  vpp# nat44 add load-balancing static mapping protocol tcp external 1.2.3.4:80 local 10.100.10.10:8080 probability 80 local 10.100.10.20:8080 probability 20
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (add_lb_static_mapping_command, static) = {
    .path = "nat44 add load-balancing static mapping",
    .function = add_lb_static_mapping_command_fn,
    .short_help =
      "nat44 add load-balancing static mapping protocol tcp|udp "
      "external <addr>:<port> local <addr>:<port> [vrf <table-id>] "
      "probability <n> [twice-nat|self-twice-nat] [out2in-only] "
      "[affinity <timeout-seconds>] [del]",
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 add load-balancing static mapping}
   * Modify service load balancing using NAT44
   * To add new back-end server 10.100.10.30:8080 for service load balancing
   * static mapping with external IP address 1.2.3.4 and TCP port 80 use:
   *  vpp# nat44 add load-balancing back-end protocol tcp external 1.2.3.4:80 local 10.100.10.30:8080 probability 25
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (add_lb_backend_command, static) = {
    .path = "nat44 add load-balancing back-end",
    .function = add_lb_backend_command_fn,
    .short_help =
      "nat44 add load-balancing back-end protocol tcp|udp "
      "external <addr>:<port> local <addr>:<port> [vrf <table-id>] "
      "probability <n> [del]",
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat44 static mappings}
   * Show NAT44 static mappings.
   * vpp# show nat44 static mappings
   * NAT44 static mappings:
   *  local 10.0.0.3 external 4.4.4.4 vrf 0
   *  tcp local 192.168.0.4:6303 external 4.4.4.3:3606 vrf 0
   *  tcp vrf 0 external 1.2.3.4:80  out2in-only
   *   local 10.100.10.10:8080 probability 80
   *   local 10.100.10.20:8080 probability 20
   *  tcp local 10.100.3.8:8080 external 169.10.10.1:80 vrf 0 twice-nat
   *  tcp local 10.0.0.10:3603 external GigabitEthernet0/a/0:6306 vrf 10
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_show_static_mappings_command, static) = {
    .path = "show nat44 static mappings",
    .short_help = "show nat44 static mappings",
    .function = nat44_show_static_mappings_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 add interface address}
   * Use NAT44 pool address from specific interfce
   * To add NAT44 pool address from specific interface use:
   *  vpp# nat44 add interface address GigabitEthernet0/8/0
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (snat_add_interface_address_command, static) = {
      .path = "nat44 add interface address",
      .short_help = "nat44 add interface address <interface> [twice-nat] [del]",
      .function = snat_add_interface_address_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat44 interface address}
   * Show NAT44 pool address interfaces
   * vpp# show nat44 interface address
   * NAT44 pool address interfaces:
   *  GigabitEthernet0/a/0
   * NAT44 twice-nat pool address interfaces:
   *  GigabitEthernet0/8/0
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_show_interface_address_command, static) = {
    .path = "show nat44 interface address",
    .short_help = "show nat44 interface address",
    .function = nat44_show_interface_address_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{show nat44 sessions}
   * Show NAT44 sessions.
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_show_sessions_command, static) = {
    .path = "show nat44 sessions",
    .short_help = "show nat44 sessions [detail|metrics]",
    .function = nat44_show_sessions_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{set nat44 session limit}
   * Set NAT44 session limit.
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_set_session_limit_command, static) = {
    .path = "set nat44 session limit",
    .short_help = "set nat44 session limit <limit> [vrf <table-id>]",
    .function = nat44_set_session_limit_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 del user}
   * To delete all NAT44 user sessions:
   *  vpp# nat44 del user 10.0.0.3
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_del_user_command, static) = {
      .path = "nat44 del user",
      .short_help = "nat44 del user <addr> [fib <index>]",
      .function = nat44_del_user_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{clear nat44 sessions}
   * To clear all NAT44 sessions
   *  vpp# clear nat44 sessions
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_clear_sessions_command, static) = {
      .path = "clear nat44 sessions",
      .short_help = "clear nat44 sessions",
      .function = nat44_clear_sessions_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 del session}
   * To administratively delete NAT44 session by inside address and port use:
   *  vpp# nat44 del session in 10.0.0.3:6303 tcp
   * To administratively delete NAT44 session by outside address and port use:
   *  vpp# nat44 del session out 1.0.0.3:6033 udp
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (nat44_del_session_command, static) = {
      .path = "nat44 del session",
      .short_help = "nat44 del session in|out <addr>:<port> tcp|udp|icmp [vrf <id>] [external-host <addr>:<port>]",
      .function = nat44_del_session_command_fn,
  };
  
  /*?
   * @cliexpar
   * @cliexstart{nat44 forwarding}
   * Enable or disable forwarding
   * Forward packets which don't match existing translation
   * or static mapping instead of dropping them.
   * To enable forwarding, use:
   *  vpp# nat44 forwarding enable
   * To disable forwarding, use:
   *  vpp# nat44 forwarding disable
   * @cliexend
  ?*/
  VLIB_CLI_COMMAND (snat_forwarding_set_command, static) = {
    .path = "nat44 forwarding",
    .short_help = "nat44 forwarding enable|disable",
    .function = snat_forwarding_set_command_fn,
  };
  
  /* *INDENT-ON* */
  
  /*
   * fd.io coding-style-patch-verification: ON
   *
   * Local Variables:
   * eval: (c-set-style "gnu")
   * End:
   */
  