text: /*
   * Copyright (c) 2017 Cisco and/or its affiliates.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at:
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <vnet/session/application.h>
  #include <vnet/session/application_interface.h>
  #include <vnet/session/application_namespace.h>
  #include <vnet/session/session.h>
  
  static app_main_t app_main;
  
  static app_worker_map_t *
  app_worker_map_alloc (application_t * app)
  {
    app_worker_map_t *map;
    pool_get (app->worker_maps, map);
    memset (map, 0, sizeof (*map));
    return map;
  }
  
  static u32
  app_worker_map_index (application_t * app, app_worker_map_t * map)
  {
    return (map - app->worker_maps);
  }
  
  static void
  app_worker_map_free (application_t * app, app_worker_map_t * map)
  {
    pool_put (app->worker_maps, map);
  }
  
  static app_worker_map_t *
  app_worker_map_get (application_t * app, u32 map_index)
  {
    return pool_elt_at_index (app->worker_maps, map_index);
  }
  
  static u8 *
  app_get_name_from_reg_index (application_t * app)
  {
    u8 *app_name;
  
    vl_api_registration_t *regp;
    regp = vl_api_client_index_to_registration (app->api_client_index);
    if (!regp)
      app_name = format (0, "builtin-%d%c", app->app_index, 0);
    else
      app_name = format (0, "%s%c", regp->name, 0);
  
    return app_name;
  }
  
  static u8 *
  app_get_name (application_t * app)
  {
    if (!app->name)
      return app_get_name_from_reg_index (app);
    return app->name;
  }
  
  u32
  application_session_table (application_t * app, u8 fib_proto)
  {
    app_namespace_t *app_ns;
    app_ns = app_namespace_get (app->ns_index);
    if (!application_has_global_scope (app))
      return APP_INVALID_INDEX;
    if (fib_proto == FIB_PROTOCOL_IP4)
      return session_lookup_get_index_for_fib (fib_proto,
  					     app_ns->ip4_fib_index);
    else
      return session_lookup_get_index_for_fib (fib_proto,
  					     app_ns->ip6_fib_index);
  }
  
  u32
  application_local_session_table (application_t * app)
  {
    app_namespace_t *app_ns;
    if (!application_has_local_scope (app))
      return APP_INVALID_INDEX;
    app_ns = app_namespace_get (app->ns_index);
    return app_ns->local_table_index;
  }
  
  int
  application_api_queue_is_full (application_t * app)
  {
    svm_queue_t *q;
  
    /* builtin servers are always OK */
    if (app->api_client_index == ~0)
      return 0;
  
    q = vl_api_client_index_to_input_queue (app->api_client_index);
    if (!q)
      return 1;
  
    if (q->cursize == q->maxsize)
      return 1;
    return 0;
  }
  
  /**
   * Returns app name
   *
   * Since the name is not stored per app, we generate it on the fly. It is
   * the caller's responsibility to free the vector
   */
  u8 *
  application_name_from_index (u32 app_index)
  {
    application_t *app = application_get (app_index);
    if (!app)
      return 0;
    return app_get_name_from_reg_index (app);
  }
  
  static void
  application_table_add (application_t * app)
  {
    if (app->api_client_index != APP_INVALID_INDEX)
      hash_set (app_main.app_by_api_client_index, app->api_client_index,
  	      app->app_index);
    else if (app->name)
      hash_set_mem (app_main.app_by_name, app->name, app->app_index);
  }
  
  static void
  application_table_del (application_t * app)
  {
    if (app->api_client_index != APP_INVALID_INDEX)
      hash_unset (app_main.app_by_api_client_index, app->api_client_index);
    else if (app->name)
      hash_unset_mem (app_main.app_by_name, app->name);
  }
  
  application_t *
  application_lookup (u32 api_client_index)
  {
    uword *p;
    p = hash_get (app_main.app_by_api_client_index, api_client_index);
    if (p)
      return application_get (p[0]);
  
    return 0;
  }
  
  application_t *
  application_lookup_name (const u8 * name)
  {
    uword *p;
    p = hash_get_mem (app_main.app_by_name, name);
    if (p)
      return application_get (p[0]);
  
    return 0;
  }
  
  application_t *
  application_alloc (void)
  {
    application_t *app;
    pool_get (app_main.app_pool, app);
    memset (app, 0, sizeof (*app));
    app->app_index = app - app_main.app_pool;
    return app;
  }
  
  application_t *
  application_get (u32 app_index)
  {
    if (app_index == APP_INVALID_INDEX)
      return 0;
    return pool_elt_at_index (app_main.app_pool, app_index);
  }
  
  application_t *
  application_get_if_valid (u32 app_index)
  {
    if (pool_is_free_index (app_main.app_pool, app_index))
      return 0;
  
    return pool_elt_at_index (app_main.app_pool, app_index);
  }
  
  u32
  application_index (application_t * app)
  {
    return app - app_main.app_pool;
  }
  
  static void
  application_verify_cb_fns (session_cb_vft_t * cb_fns)
  {
    if (cb_fns->session_accept_callback == 0)
      clib_warning ("No accept callback function provided");
    if (cb_fns->session_connected_callback == 0)
      clib_warning ("No session connected callback function provided");
    if (cb_fns->session_disconnect_callback == 0)
      clib_warning ("No session disconnect callback function provided");
    if (cb_fns->session_reset_callback == 0)
      clib_warning ("No session reset callback function provided");
  }
  
  /**
   * Check app config for given segment type
   *
   * Returns 1 on success and 0 otherwise
   */
  static u8
  application_verify_cfg (ssvm_segment_type_t st)
  {
    u8 is_valid;
    if (st == SSVM_SEGMENT_MEMFD)
      {
        is_valid = (session_manager_get_evt_q_segment () != 0);
        if (!is_valid)
  	clib_warning ("memfd seg: vpp's event qs IN binary api svm region");
        return is_valid;
      }
    else if (st == SSVM_SEGMENT_SHM)
      {
        is_valid = (session_manager_get_evt_q_segment () == 0);
        if (!is_valid)
  	clib_warning ("shm seg: vpp's event qs NOT IN binary api svm region");
        return is_valid;
      }
    else
      return 1;
  }
  
  int
  application_alloc_and_init (app_init_args_t * a)
  {
    ssvm_segment_type_t seg_type = SSVM_SEGMENT_MEMFD;
    segment_manager_properties_t *props;
    vl_api_registration_t *reg;
    application_t *app;
    u64 *options;
  
    app = application_alloc ();
    options = a->options;
    /*
     * Make sure we support the requested configuration
     */
    if (!(options[APP_OPTIONS_FLAGS] & APP_OPTIONS_FLAGS_IS_BUILTIN))
      {
        reg = vl_api_client_index_to_registration (a->api_client_index);
        if (!reg)
  	return VNET_API_ERROR_APP_UNSUPPORTED_CFG;
        if (vl_api_registration_file_index (reg) == VL_API_INVALID_FI)
  	seg_type = SSVM_SEGMENT_SHM;
      }
    else
      {
        if (options[APP_OPTIONS_FLAGS] & APP_OPTIONS_FLAGS_EVT_MQ_USE_EVENTFD)
  	{
  	  clib_warning ("mq eventfds can only be used if socket transport is "
  			"used for api");
  	  return VNET_API_ERROR_APP_UNSUPPORTED_CFG;
  	}
        seg_type = SSVM_SEGMENT_PRIVATE;
      }
  
    if (!application_verify_cfg (seg_type))
      return VNET_API_ERROR_APP_UNSUPPORTED_CFG;
  
    /* Check that the obvious things are properly set up */
    application_verify_cb_fns (a->session_cb_vft);
  
    app->api_client_index = a->api_client_index;
    app->flags = options[APP_OPTIONS_FLAGS];
    app->cb_fns = *a->session_cb_vft;
    app->ns_index = options[APP_OPTIONS_NAMESPACE];
    app->proxied_transports = options[APP_OPTIONS_PROXY_TRANSPORT];
    app->name = vec_dup (a->name);
  
    /* If no scope enabled, default to global */
    if (!application_has_global_scope (app)
        && !application_has_local_scope (app))
      app->flags |= APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE;
  
    props = application_segment_manager_properties (app);
    segment_manager_properties_init (props);
    props->segment_size = options[APP_OPTIONS_ADD_SEGMENT_SIZE];
    props->prealloc_fifos = options[APP_OPTIONS_PREALLOC_FIFO_PAIRS];
    if (options[APP_OPTIONS_ADD_SEGMENT_SIZE])
      {
        props->add_segment_size = options[APP_OPTIONS_ADD_SEGMENT_SIZE];
        props->add_segment = 1;
      }
    if (options[APP_OPTIONS_RX_FIFO_SIZE])
      props->rx_fifo_size = options[APP_OPTIONS_RX_FIFO_SIZE];
    if (options[APP_OPTIONS_TX_FIFO_SIZE])
      props->tx_fifo_size = options[APP_OPTIONS_TX_FIFO_SIZE];
    if (options[APP_OPTIONS_EVT_QUEUE_SIZE])
      props->evt_q_size = options[APP_OPTIONS_EVT_QUEUE_SIZE];
    if (options[APP_OPTIONS_FLAGS] & APP_OPTIONS_FLAGS_EVT_MQ_USE_EVENTFD)
      props->use_mq_eventfd = 1;
    if (options[APP_OPTIONS_TLS_ENGINE])
      app->tls_engine = options[APP_OPTIONS_TLS_ENGINE];
    props->segment_type = seg_type;
  
    /* Add app to lookup by api_client_index table */
    application_table_add (app);
    a->app_index = application_index (app);
  
    APP_DBG ("New app name: %v api index: %u index %u", app->name,
  	   app->api_client_index, app->app_index);
  
    return 0;
  }
  
  void
  application_free (application_t * app)
  {
    app_worker_map_t *wrk_map;
    app_worker_t *app_wrk;
  
    /*
     * The app event queue allocated in first segment is cleared with
     * the segment manager. No need to explicitly free it.
     */
    APP_DBG ("Delete app name %v api index: %d index: %d", app->name,
  	   app->api_client_index, app->app_index);
  
    if (application_is_proxy (app))
      application_remove_proxy (app);
  
    /* *INDENT-OFF* */
    pool_flush (wrk_map, app->worker_maps, ({
      app_wrk = app_worker_get (wrk_map->wrk_index);
      app_worker_free (app_wrk);
    }));
    /* *INDENT-ON* */
    pool_free (app->worker_maps);
  
    application_table_del (app);
    vec_free (app->name);
    vec_free (app->tls_cert);
    vec_free (app->tls_key);
    pool_put (app_main.app_pool, app);
  }
  
  app_worker_t *
  application_get_worker (application_t * app, u32 wrk_map_index)
  {
    app_worker_map_t *map;
    map = app_worker_map_get (app, wrk_map_index);
    if (!map)
      return 0;
    return app_worker_get (map->wrk_index);
  }
  
  app_worker_t *
  application_get_default_worker (application_t * app)
  {
    return application_get_worker (app, 0);
  }
  
  app_worker_t *
  app_worker_alloc (application_t * app)
  {
    app_worker_t *app_wrk;
    pool_get (app_main.workers, app_wrk);
    memset (app_wrk, 0, sizeof (*app_wrk));
    app_wrk->wrk_index = app_wrk - app_main.workers;
    app_wrk->app_index = app->app_index;
    app_wrk->wrk_map_index = ~0;
    app_wrk->connects_seg_manager = APP_INVALID_SEGMENT_MANAGER_INDEX;
    app_wrk->first_segment_manager = APP_INVALID_SEGMENT_MANAGER_INDEX;
    app_wrk->local_segment_manager = APP_INVALID_SEGMENT_MANAGER_INDEX;
    APP_DBG ("New app %v worker %u", app_get_name (app), app_wrk->wrk_index);
    return app_wrk;
  }
  
  app_worker_t *
  app_worker_get (u32 wrk_index)
  {
    return pool_elt_at_index (app_main.workers, wrk_index);
  }
  
  app_worker_t *
  app_worker_get_if_valid (u32 wrk_index)
  {
    if (pool_is_free_index (app_main.workers, wrk_index))
      return 0;
    return pool_elt_at_index (app_main.workers, wrk_index);
  }
  
  void
  app_worker_free (app_worker_t * app_wrk)
  {
    application_t *app = application_get (app_wrk->app_index);
    vnet_unbind_args_t _a, *a = &_a;
    u64 handle, *handles = 0;
    segment_manager_t *sm;
    u32 sm_index;
    int i;
  
    /*
     *  Listener cleanup
     */
  
    /* *INDENT-OFF* */
    hash_foreach (handle, sm_index, app_wrk->listeners_table,
    ({
      vec_add1 (handles, handle);
      sm = segment_manager_get (sm_index);
      sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
    }));
    /* *INDENT-ON* */
  
    for (i = 0; i < vec_len (handles); i++)
      {
        a->app_index = app->app_index;
        a->app_wrk_index = app_wrk->wrk_map_index;
        a->handle = handles[i];
        /* seg manager is removed when unbind completes */
        vnet_unbind (a);
      }
  
    /*
     * Connects segment manager cleanup
     */
  
    if (app_wrk->connects_seg_manager != APP_INVALID_SEGMENT_MANAGER_INDEX)
      {
        sm = segment_manager_get (app_wrk->connects_seg_manager);
        sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
        segment_manager_init_del (sm);
      }
  
    /* If first segment manager is used by a listener */
    if (app_wrk->first_segment_manager != APP_INVALID_SEGMENT_MANAGER_INDEX
        && app_wrk->first_segment_manager != app_wrk->connects_seg_manager)
      {
        sm = segment_manager_get (app_wrk->first_segment_manager);
        /* .. and has no fifos, e.g. it might be used for redirected sessions,
         * remove it */
        if (!segment_manager_has_fifos (sm))
  	{
  	  sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
  	  segment_manager_del (sm);
  	}
      }
  
    /*
     * Local sessions
     */
    application_local_sessions_free (app_wrk);
  
    pool_put (app_main.workers, app_wrk);
    if (CLIB_DEBUG)
      memset (app_wrk, 0xfe, sizeof (*app_wrk));
  }
  
  int
  app_worker_alloc_and_init (application_t * app, app_worker_t ** wrk)
  {
    app_worker_map_t *wrk_map;
    app_worker_t *app_wrk;
    segment_manager_t *sm;
    int rv;
  
    app_wrk = app_worker_alloc (app);
    wrk_map = app_worker_map_alloc (app);
    wrk_map->wrk_index = app_wrk->wrk_index;
    app_wrk->wrk_map_index = app_worker_map_index (app, wrk_map);
  
    /*
     * Setup first segment manager
     */
    sm = segment_manager_new ();
    sm->app_wrk_index = app_wrk->wrk_index;
  
    if ((rv = segment_manager_init (sm, app->sm_properties.segment_size,
  				  app->sm_properties.prealloc_fifos)))
      {
        app_worker_free (app_wrk);
        return rv;
      }
    sm->first_is_protected = 1;
  
    /*
     * Setup app worker
     */
    app_wrk->first_segment_manager = segment_manager_index (sm);
    app_wrk->listeners_table = hash_create (0, sizeof (u64));
    app_wrk->event_queue = segment_manager_event_queue (sm);
    app_wrk->app_is_builtin = application_is_builtin (app);
  
    /*
     * Segment manager for local sessions
     */
    sm = segment_manager_new ();
    sm->app_wrk_index = app_wrk->wrk_index;
    app_wrk->local_segment_manager = segment_manager_index (sm);
    app_wrk->local_connects = hash_create (0, sizeof (u64));
  
    *wrk = app_wrk;
  
    return 0;
  }
  
  static segment_manager_t *
  application_alloc_segment_manager (app_worker_t * app_wrk)
  {
    segment_manager_t *sm = 0;
  
    /* If the first segment manager is not in use, don't allocate a new one */
    if (app_wrk->first_segment_manager != APP_INVALID_SEGMENT_MANAGER_INDEX
        && app_wrk->first_segment_manager_in_use == 0)
      {
        sm = segment_manager_get (app_wrk->first_segment_manager);
        app_wrk->first_segment_manager_in_use = 1;
        return sm;
      }
  
    sm = segment_manager_new ();
    sm->app_wrk_index = app_wrk->wrk_index;
  
    return sm;
  }
  
  /**
   * Start listening local transport endpoint for requested transport.
   *
   * Creates a 'dummy' stream session with state LISTENING to be used in session
   * lookups, prior to establishing connection. Requests transport to build
   * it's own specific listening connection.
   */
  int
  app_worker_start_listen (app_worker_t * app_wrk, session_endpoint_t * sep,
  			 session_handle_t * res)
  {
    segment_manager_t *sm;
    stream_session_t *s;
    session_handle_t handle;
    session_type_t sst;
  
    sst = session_type_from_proto_and_ip (sep->transport_proto, sep->is_ip4);
    s = listen_session_new (0, sst);
    s->app_wrk_index = app_wrk->wrk_index;
  
    /* Allocate segment manager. All sessions derived out of a listen session
     * have fifos allocated by the same segment manager. */
    if (!(sm = application_alloc_segment_manager (app_wrk)))
      goto err;
  
    /* Add to app's listener table. Useful to find all child listeners
     * when app goes down, although, just for unbinding this is not needed */
    handle = listen_session_get_handle (s);
    hash_set (app_wrk->listeners_table, handle, segment_manager_index (sm));
  
    if (stream_session_listen (s, sep))
      {
        segment_manager_del (sm);
        hash_unset (app_wrk->listeners_table, handle);
        goto err;
      }
  
    *res = handle;
    return 0;
  
  err:
    listen_session_del (s);
    return -1;
  }
  
  /**
   * Stop listening on session associated to handle
   *
   * @param handle	listener handle
   * @param app_index	index of the app owning the handle. This is used
   * 			only for validating ownership
   */
  int
  app_worker_stop_listen (session_handle_t handle, u32 app_index)
  {
    stream_session_t *listener;
    segment_manager_t *sm;
    app_worker_t *app_wrk;
    uword *indexp;
  
    listener = listen_session_get_from_handle (handle);
    app_wrk = app_worker_get (listener->app_wrk_index);
    if (PREDICT_FALSE (!app_wrk || app_wrk->app_index != app_index))
      {
        clib_warning ("app doesn't own handle %llu!", handle);
        return -1;
      }
    if (PREDICT_FALSE (hash_get (app_wrk->listeners_table, handle) == 0))
      {
        clib_warning ("listener handle was removed %llu!", handle);
        return -1;
      }
  
    stream_session_stop_listen (listener);
  
    indexp = hash_get (app_wrk->listeners_table, handle);
    ASSERT (indexp);
  
    sm = segment_manager_get (*indexp);
    if (app_wrk->first_segment_manager == *indexp)
      {
        /* Delete sessions but don't remove segment manager */
        app_wrk->first_segment_manager_in_use = 0;
        segment_manager_del_sessions (sm);
      }
    else
      {
        segment_manager_init_del (sm);
      }
    hash_unset (app_wrk->listeners_table, handle);
    listen_session_del (listener);
  
    return 0;
  }
  
  int
  app_worker_open_session (app_worker_t * app, session_endpoint_t * sep,
  			 u32 api_context)
  {
    int rv;
  
    /* Make sure we have a segment manager for connects */
    app_worker_alloc_connects_segment_manager (app);
  
    if ((rv = session_open (app->wrk_index, sep, api_context)))
      return rv;
  
    return 0;
  }
  
  int
  app_worker_alloc_connects_segment_manager (app_worker_t * app_wrk)
  {
    segment_manager_t *sm;
  
    if (app_wrk->connects_seg_manager == APP_INVALID_SEGMENT_MANAGER_INDEX)
      {
        sm = application_alloc_segment_manager (app_wrk);
        if (sm == 0)
  	return -1;
        app_wrk->connects_seg_manager = segment_manager_index (sm);
      }
    return 0;
  }
  
  segment_manager_t *
  app_worker_get_connect_segment_manager (app_worker_t * app)
  {
    ASSERT (app->connects_seg_manager != (u32) ~ 0);
    return segment_manager_get (app->connects_seg_manager);
  }
  
  segment_manager_t *
  app_worker_get_listen_segment_manager (app_worker_t * app,
  				       stream_session_t * s)
  {
    uword *smp;
    smp = hash_get (app->listeners_table, listen_session_get_handle (s));
    ASSERT (smp != 0);
    return segment_manager_get (*smp);
  }
  
  clib_error_t *
  vnet_app_worker_add_del (vnet_app_worker_add_del_args_t * a)
  {
    svm_fifo_segment_private_t *fs;
    app_worker_map_t *wrk_map;
    app_worker_t *app_wrk;
    segment_manager_t *sm;
    application_t *app;
    int rv;
  
    app = application_get (a->app_index);
    if (!app)
      return clib_error_return_code (0, VNET_API_ERROR_INVALID_VALUE, 0,
  				   "App %u does not exist", a->app_index);
  
    if (a->is_add)
      {
        if ((rv = app_worker_alloc_and_init (app, &app_wrk)))
  	return clib_error_return_code (0, rv, 0, "app wrk init: %d", rv);
        sm = segment_manager_get (app_wrk->first_segment_manager);
        fs = segment_manager_get_segment_w_lock (sm, 0);
        a->segment = &fs->ssvm;
        segment_manager_segment_reader_unlock (sm);
        a->evt_q = app_wrk->event_queue;
      }
    else
      {
        wrk_map = app_worker_map_get (app, a->wrk_index);
        if (!wrk_map)
  	return clib_error_return_code (0, VNET_API_ERROR_INVALID_VALUE, 0,
  				       "App %u does not have worker %u",
  				       app->app_index, a->wrk_index);
        app_wrk = app_worker_get (wrk_map->wrk_index);
        app_worker_map_free (app, wrk_map);
        if (!app_wrk)
  	return clib_error_return_code (0, VNET_API_ERROR_INVALID_VALUE, 0,
  				       "No worker %u", a->wrk_index);
        app_worker_free (app_wrk);
      }
    return 0;
  }
  
  segment_manager_t *
  application_get_local_segment_manager (app_worker_t * app)
  {
    return segment_manager_get (app->local_segment_manager);
  }
  
  segment_manager_t *
  application_get_local_segment_manager_w_session (app_worker_t * app,
  						 local_session_t * ls)
  {
    stream_session_t *listener;
    if (application_local_session_listener_has_transport (ls))
      {
        listener = listen_session_get (ls->listener_index);
        return app_worker_get_listen_segment_manager (app, listener);
      }
    return segment_manager_get (app->local_segment_manager);
  }
  
  int
  application_is_proxy (application_t * app)
  {
    return (app->flags & APP_OPTIONS_FLAGS_IS_PROXY);
  }
  
  int
  application_is_builtin (application_t * app)
  {
    return (app->flags & APP_OPTIONS_FLAGS_IS_BUILTIN);
  }
  
  int
  application_is_builtin_proxy (application_t * app)
  {
    return (application_is_proxy (app) && application_is_builtin (app));
  }
  
  u8
  application_has_local_scope (application_t * app)
  {
    return app->flags & APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE;
  }
  
  u8
  application_has_global_scope (application_t * app)
  {
    return app->flags & APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE;
  }
  
  u8
  application_use_mq_for_ctrl (application_t * app)
  {
    return app->flags & APP_OPTIONS_FLAGS_USE_MQ_FOR_CTRL_MSGS;
  }
  
  /**
   * Send an API message to the external app, to map new segment
   */
  int
  app_worker_add_segment_notify (u32 app_wrk_index, ssvm_private_t * fs)
  {
    app_worker_t *app_wrk = app_worker_get (app_wrk_index);
    application_t *app = application_get (app_wrk->app_index);
    return app->cb_fns.add_segment_callback (app->api_client_index, fs);
  }
  
  u32
  application_n_listeners (app_worker_t * app)
  {
    return hash_elts (app->listeners_table);
  }
  
  stream_session_t *
  app_worker_first_listener (app_worker_t * app, u8 fib_proto,
  			   u8 transport_proto)
  {
    stream_session_t *listener;
    u64 handle;
    u32 sm_index;
    u8 sst;
  
    sst = session_type_from_proto_and_ip (transport_proto,
  					fib_proto == FIB_PROTOCOL_IP4);
  
    /* *INDENT-OFF* */
     hash_foreach (handle, sm_index, app->listeners_table, ({
       listener = listen_session_get_from_handle (handle);
       if (listener->session_type == sst
  	 && listener->listener_index != SESSION_PROXY_LISTENER_INDEX)
         return listener;
     }));
    /* *INDENT-ON* */
  
    return 0;
  }
  
  u8
  app_worker_application_is_builtin (app_worker_t * app_wrk)
  {
    return app_wrk->app_is_builtin;
  }
  
  stream_session_t *
  application_proxy_listener (app_worker_t * app, u8 fib_proto,
  			    u8 transport_proto)
  {
    stream_session_t *listener;
    u64 handle;
    u32 sm_index;
    u8 sst;
  
    sst = session_type_from_proto_and_ip (transport_proto,
  					fib_proto == FIB_PROTOCOL_IP4);
  
    /* *INDENT-OFF* */
     hash_foreach (handle, sm_index, app->listeners_table, ({
       listener = listen_session_get_from_handle (handle);
       if (listener->session_type == sst
  	 && listener->listener_index == SESSION_PROXY_LISTENER_INDEX)
         return listener;
     }));
    /* *INDENT-ON* */
  
    return 0;
  }
  
  static clib_error_t *
  application_start_stop_proxy_fib_proto (application_t * app, u8 fib_proto,
  					u8 transport_proto, u8 is_start)
  {
    app_namespace_t *app_ns = app_namespace_get (app->ns_index);
    u8 is_ip4 = (fib_proto == FIB_PROTOCOL_IP4);
    session_endpoint_t sep = SESSION_ENDPOINT_NULL;
    transport_connection_t *tc;
    app_worker_t *app_wrk;
    stream_session_t *s;
    u64 handle;
  
    /* TODO decide if we want proxy to be enabled for all workers */
    app_wrk = application_get_default_worker (app);
    if (is_start)
      {
        s = app_worker_first_listener (app_wrk, fib_proto, transport_proto);
        if (!s)
  	{
  	  sep.is_ip4 = is_ip4;
  	  sep.fib_index = app_namespace_get_fib_index (app_ns, fib_proto);
  	  sep.sw_if_index = app_ns->sw_if_index;
  	  sep.transport_proto = transport_proto;
  	  app_worker_start_listen (app_wrk, &sep, &handle);
  	  s = listen_session_get_from_handle (handle);
  	  s->listener_index = SESSION_PROXY_LISTENER_INDEX;
  	}
      }
    else
      {
        s = application_proxy_listener (app_wrk, fib_proto, transport_proto);
        ASSERT (s);
      }
  
    tc = listen_session_get_transport (s);
  
    if (!ip_is_zero (&tc->lcl_ip, 1))
      {
        u32 sti;
        sep.is_ip4 = is_ip4;
        sep.fib_index = app_namespace_get_fib_index (app_ns, fib_proto);
        sep.transport_proto = transport_proto;
        sep.port = 0;
        sti = session_lookup_get_index_for_fib (fib_proto, sep.fib_index);
        if (is_start)
  	session_lookup_add_session_endpoint (sti, &sep, s->session_index);
        else
  	session_lookup_del_session_endpoint (sti, &sep);
      }
  
    return 0;
  }
  
  static void
  application_start_stop_proxy_local_scope (application_t * app,
  					  u8 transport_proto, u8 is_start)
  {
    session_endpoint_t sep = SESSION_ENDPOINT_NULL;
    app_namespace_t *app_ns;
    app_ns = app_namespace_get (app->ns_index);
    sep.is_ip4 = 1;
    sep.transport_proto = transport_proto;
    sep.port = 0;
  
    if (is_start)
      {
        session_lookup_add_session_endpoint (app_ns->local_table_index, &sep,
  					   app->app_index);
        sep.is_ip4 = 0;
        session_lookup_add_session_endpoint (app_ns->local_table_index, &sep,
  					   app->app_index);
      }
    else
      {
        session_lookup_del_session_endpoint (app_ns->local_table_index, &sep);
        sep.is_ip4 = 0;
        session_lookup_del_session_endpoint (app_ns->local_table_index, &sep);
      }
  }
  
  void
  application_start_stop_proxy (application_t * app,
  			      transport_proto_t transport_proto, u8 is_start)
  {
    if (application_has_local_scope (app))
      application_start_stop_proxy_local_scope (app, transport_proto, is_start);
  
    if (application_has_global_scope (app))
      {
        application_start_stop_proxy_fib_proto (app, FIB_PROTOCOL_IP4,
  					      transport_proto, is_start);
        application_start_stop_proxy_fib_proto (app, FIB_PROTOCOL_IP6,
  					      transport_proto, is_start);
      }
  }
  
  void
  application_setup_proxy (application_t * app)
  {
    u16 transports = app->proxied_transports;
    transport_proto_t tp;
  
    ASSERT (application_is_proxy (app));
  
    /* *INDENT-OFF* */
    transport_proto_foreach (tp, ({
      if (transports & (1 << tp))
        application_start_stop_proxy (app, tp, 1);
    }));
    /* *INDENT-ON* */
  }
  
  void
  application_remove_proxy (application_t * app)
  {
    u16 transports = app->proxied_transports;
    transport_proto_t tp;
  
    ASSERT (application_is_proxy (app));
  
    /* *INDENT-OFF* */
    transport_proto_foreach (tp, ({
      if (transports & (1 << tp))
        application_start_stop_proxy (app, tp, 0);
    }));
    /* *INDENT-ON* */
  }
  
  segment_manager_properties_t *
  application_segment_manager_properties (application_t * app)
  {
    return &app->sm_properties;
  }
  
  segment_manager_properties_t *
  application_get_segment_manager_properties (u32 app_index)
  {
    application_t *app = application_get (app_index);
    return &app->sm_properties;
  }
  
  static inline int
  app_enqueue_evt (svm_msg_q_t * mq, svm_msg_q_msg_t * msg, u8 lock)
  {
    if (PREDICT_FALSE (svm_msg_q_is_full (mq)))
      {
        clib_warning ("evt q full");
        svm_msg_q_free_msg (mq, msg);
        if (lock)
  	svm_msg_q_unlock (mq);
        return -1;
      }
  
    if (lock)
      {
        svm_msg_q_add_and_unlock (mq, msg);
        return 0;
      }
  
    /* Even when not locking the ring, we must wait for queue mutex */
    if (svm_msg_q_add (mq, msg, SVM_Q_WAIT))
      {
        clib_warning ("msg q add returned");
        return -1;
      }
    return 0;
  }
  
  static inline int
  app_send_io_evt_rx (app_worker_t * app_wrk, stream_session_t * s, u8 lock)
  {
    session_event_t *evt;
    svm_msg_q_msg_t msg;
    svm_msg_q_t *mq;
  
    if (PREDICT_FALSE (s->session_state != SESSION_STATE_READY
  		     && s->session_state != SESSION_STATE_LISTENING))
      {
        /* Session is closed so app will never clean up. Flush rx fifo */
        if (s->session_state == SESSION_STATE_CLOSED)
  	svm_fifo_dequeue_drop_all (s->server_rx_fifo);
        return 0;
      }
  
    if (app_worker_application_is_builtin (app_wrk))
      {
        application_t *app = application_get (app_wrk->app_index);
        return app->cb_fns.builtin_app_rx_callback (s);
      }
  
    if (svm_fifo_has_event (s->server_rx_fifo)
        || svm_fifo_is_empty (s->server_rx_fifo))
      return 0;
  
    mq = app_wrk->event_queue;
    if (lock)
      svm_msg_q_lock (mq);
  
    if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)))
      {
        clib_warning ("evt q rings full");
        if (lock)
  	svm_msg_q_unlock (mq);
        return -1;
      }
  
    msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
    ASSERT (!svm_msg_q_msg_is_invalid (&msg));
  
    evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
    evt->fifo = s->server_rx_fifo;
    evt->event_type = FIFO_EVENT_APP_RX;
  
    if (app_enqueue_evt (mq, &msg, lock))
      return -1;
    (void) svm_fifo_set_event (s->server_rx_fifo);
    return 0;
  }
  
  static inline int
  app_send_io_evt_tx (app_worker_t * app_wrk, stream_session_t * s, u8 lock)
  {
    svm_msg_q_t *mq;
    session_event_t *evt;
    svm_msg_q_msg_t msg;
  
    if (app_worker_application_is_builtin (app_wrk))
      return 0;
  
    mq = app_wrk->event_queue;
    if (lock)
      svm_msg_q_lock (mq);
  
    if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)))
      {
        clib_warning ("evt q rings full");
        if (lock)
  	svm_msg_q_unlock (mq);
        return -1;
      }
  
    msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
    ASSERT (!svm_msg_q_msg_is_invalid (&msg));
  
    evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
    evt->event_type = FIFO_EVENT_APP_TX;
    evt->fifo = s->server_tx_fifo;
  
    return app_enqueue_evt (mq, &msg, lock);
  }
  
  /* *INDENT-OFF* */
  typedef int (app_send_evt_handler_fn) (app_worker_t *app,
  				       stream_session_t *s,
  				       u8 lock);
  static app_send_evt_handler_fn * const app_send_evt_handler_fns[3] = {
      app_send_io_evt_rx,
      0,
      app_send_io_evt_tx,
  };
  /* *INDENT-ON* */
  
  /**
   * Send event to application
   *
   * Logic from queue perspective is non-blocking. That is, if there's
   * not enough space to enqueue a message, we return. However, if the lock
   * flag is set, we do wait for queue mutex.
   */
  int
  application_send_event (app_worker_t * app, stream_session_t * s, u8 evt_type)
  {
    ASSERT (app && evt_type <= FIFO_EVENT_APP_TX);
    return app_send_evt_handler_fns[evt_type] (app, s, 0 /* lock */ );
  }
  
  int
  application_lock_and_send_event (app_worker_t * app, stream_session_t * s,
  				 u8 evt_type)
  {
    return app_send_evt_handler_fns[evt_type] (app, s, 1 /* lock */ );
  }
  
  local_session_t *
  application_alloc_local_session (app_worker_t * app)
  {
    local_session_t *s;
    pool_get (app->local_sessions, s);
    memset (s, 0, sizeof (*s));
    s->app_wrk_index = app->app_index;
    s->session_index = s - app->local_sessions;
    s->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE, 0);
    return s;
  }
  
  void
  application_free_local_session (app_worker_t * app, local_session_t * s)
  {
    pool_put (app->local_sessions, s);
    if (CLIB_DEBUG)
      memset (s, 0xfc, sizeof (*s));
  }
  
  local_session_t *
  application_get_local_session (app_worker_t * app_wrk, u32 session_index)
  {
    if (pool_is_free_index (app_wrk->local_sessions, session_index))
      return 0;
    return pool_elt_at_index (app_wrk->local_sessions, session_index);
  }
  
  local_session_t *
  application_get_local_session_from_handle (session_handle_t handle)
  {
    app_worker_t *server_wrk;
    u32 session_index, server_wrk_index;
    local_session_parse_handle (handle, &server_wrk_index, &session_index);
    server_wrk = app_worker_get_if_valid (server_wrk_index);
    if (!server_wrk)
      return 0;
    return application_get_local_session (server_wrk, session_index);
  }
  
  local_session_t *
  application_get_local_listen_session_from_handle (session_handle_t lh)
  {
    u32 ll_index, server_wrk_index;
    app_worker_t *server_wrk;
  
    local_session_parse_handle (lh, &server_wrk_index, &ll_index);
    server_wrk = app_worker_get (server_wrk_index);
    return application_get_local_listen_session (server_wrk, ll_index);
  }
  
  always_inline void
  application_local_listener_session_endpoint (local_session_t * ll,
  					     session_endpoint_t * sep)
  {
    sep->transport_proto =
      session_type_transport_proto (ll->listener_session_type);
    sep->port = ll->port;
    sep->is_ip4 = ll->listener_session_type & 1;
  }
  
  int
  application_start_local_listen (app_worker_t * app_wrk,
  				session_endpoint_t * sep,
  				session_handle_t * handle)
  {
    session_handle_t lh;
    local_session_t *ll;
    application_t *app;
    u32 table_index;
  
    app = application_get (app_wrk->app_index);
    table_index = application_local_session_table (app);
  
    /* An exact sep match, as opposed to session_lookup_local_listener */
    lh = session_lookup_endpoint_listener (table_index, sep, 1);
    if (lh != SESSION_INVALID_HANDLE)
      return VNET_API_ERROR_ADDRESS_IN_USE;
  
    pool_get (app_wrk->local_listen_sessions, ll);
    memset (ll, 0, sizeof (*ll));
    ll->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE, 0);
    ll->app_wrk_index = app_wrk->app_index;
    ll->session_index = ll - app_wrk->local_listen_sessions;
    ll->port = sep->port;
    /* Store the original session type for the unbind */
    ll->listener_session_type =
      session_type_from_proto_and_ip (sep->transport_proto, sep->is_ip4);
    ll->transport_listener_index = ~0;
  
    *handle = application_local_session_handle (ll);
    session_lookup_add_session_endpoint (table_index, sep, *handle);
  
    return 0;
  }
  
  /**
   * Clean up local session table. If we have a listener session use it to
   * find the port and proto. If not, the handle must be a local table handle
   * so parse it.
   */
  int
  application_stop_local_listen (session_handle_t lh, u32 app_index)
  {
    session_endpoint_t sep = SESSION_ENDPOINT_NULL;
    u32 table_index, ll_index, server_wrk_index;
    app_worker_t *server_wrk;
    stream_session_t *sl = 0;
    local_session_t *ll, *ls;
    application_t *server;
  
    server = application_get (app_index);
    table_index = application_local_session_table (server);
  
    /* We have both local and global table binds. Figure from global what
     * the sep we should be cleaning up is.
     */
    if (!session_handle_is_local (lh))
      {
        sl = listen_session_get_from_handle (lh);
        if (!sl || listen_session_get_local_session_endpoint (sl, &sep))
  	{
  	  clib_warning ("broken listener");
  	  return -1;
  	}
        lh = session_lookup_endpoint_listener (table_index, &sep, 0);
        if (lh == SESSION_INVALID_HANDLE)
  	return -1;
      }
  
    local_session_parse_handle (lh, &server_wrk_index, &ll_index);
    server_wrk = app_worker_get (server_wrk_index);
    if (PREDICT_FALSE (server_wrk->app_index != app_index))
      {
        clib_warning ("app %u does not own local handle 0x%lx", app_index, lh);
      }
    ll = application_get_local_listen_session (server_wrk, ll_index);
    if (PREDICT_FALSE (!ll))
      {
        clib_warning ("no local listener");
        return -1;
      }
    application_local_listener_session_endpoint (ll, &sep);
    session_lookup_del_session_endpoint (table_index, &sep);
  
    /* *INDENT-OFF* */
    pool_foreach (ls, server_wrk->local_sessions, ({
      if (ls->listener_index == ll->session_index)
        application_local_session_disconnect (server_wrk->app_index, ls);
    }));
    /* *INDENT-ON* */
    pool_put_index (server_wrk->local_listen_sessions, ll->session_index);
  
    return 0;
  }
  
  static void
  application_local_session_fix_eventds (svm_msg_q_t * sq, svm_msg_q_t * cq)
  {
    int fd;
  
    /*
     * segment manager initializes only the producer eventds, since vpp is
     * typically the producer. But for local sessions, we also pass to the
     * apps the mqs they listen on for events from peer apps, so they are also
     * consumer fds.
     */
    fd = svm_msg_q_get_producer_eventfd (sq);
    svm_msg_q_set_consumer_eventfd (sq, fd);
    fd = svm_msg_q_get_producer_eventfd (cq);
    svm_msg_q_set_consumer_eventfd (cq, fd);
  }
  
  int
  application_local_session_connect (app_worker_t * client_wrk,
  				   app_worker_t * server_wrk,
  				   local_session_t * ll, u32 opaque)
  {
    u32 seg_size, evt_q_sz, evt_q_elts, margin = 16 << 10;
    segment_manager_properties_t *props, *cprops;
    u32 round_rx_fifo_sz, round_tx_fifo_sz;
    int rv, has_transport, seg_index;
    svm_fifo_segment_private_t *seg;
    application_t *server, *client;
    segment_manager_t *sm;
    local_session_t *ls;
    svm_msg_q_t *sq, *cq;
  
    ls = application_alloc_local_session (server_wrk);
  
    server = application_get (server_wrk->app_index);
    client = application_get (client_wrk->app_index);
  
    props = application_segment_manager_properties (server);
    cprops = application_segment_manager_properties (client);
    evt_q_elts = props->evt_q_size + cprops->evt_q_size;
    evt_q_sz = segment_manager_evt_q_expected_size (evt_q_elts);
    round_rx_fifo_sz = 1 << max_log2 (props->rx_fifo_size);
    round_tx_fifo_sz = 1 << max_log2 (props->tx_fifo_size);
    seg_size = round_rx_fifo_sz + round_tx_fifo_sz + evt_q_sz + margin;
  
    has_transport = session_has_transport ((stream_session_t *) ll);
    if (!has_transport)
      {
        /* Local sessions don't have backing transport */
        ls->port = ll->port;
        sm = application_get_local_segment_manager (server_wrk);
      }
    else
      {
        stream_session_t *sl = (stream_session_t *) ll;
        transport_connection_t *tc;
        tc = listen_session_get_transport (sl);
        ls->port = tc->lcl_port;
        sm = app_worker_get_listen_segment_manager (server_wrk, sl);
      }
  
    seg_index = segment_manager_add_segment (sm, seg_size);
    if (seg_index < 0)
      {
        clib_warning ("failed to add new cut-through segment");
        return seg_index;
      }
    seg = segment_manager_get_segment_w_lock (sm, seg_index);
    sq = segment_manager_alloc_queue (seg, props);
    cq = segment_manager_alloc_queue (seg, cprops);
  
    if (props->use_mq_eventfd)
      application_local_session_fix_eventds (sq, cq);
  
    ls->server_evt_q = pointer_to_uword (sq);
    ls->client_evt_q = pointer_to_uword (cq);
    rv = segment_manager_try_alloc_fifos (seg, props->rx_fifo_size,
  					props->tx_fifo_size,
  					&ls->server_rx_fifo,
  					&ls->server_tx_fifo);
    if (rv)
      {
        clib_warning ("failed to add fifos in cut-through segment");
        segment_manager_segment_reader_unlock (sm);
        goto failed;
      }
    ls->server_rx_fifo->master_session_index = ls->session_index;
    ls->server_tx_fifo->master_session_index = ls->session_index;
    ls->server_rx_fifo->master_thread_index = ~0;
    ls->server_tx_fifo->master_thread_index = ~0;
    ls->svm_segment_index = seg_index;
    ls->listener_index = ll->session_index;
    ls->client_wrk_index = client_wrk->wrk_index;
    ls->client_opaque = opaque;
    ls->listener_session_type = ll->session_type;
  
    if ((rv = server->cb_fns.add_segment_callback (server->api_client_index,
  						 &seg->ssvm)))
      {
        clib_warning ("failed to notify server of new segment");
        segment_manager_segment_reader_unlock (sm);
        goto failed;
      }
    segment_manager_segment_reader_unlock (sm);
    if ((rv = server->cb_fns.session_accept_callback ((stream_session_t *) ls)))
      {
        clib_warning ("failed to send accept cut-through notify to server");
        goto failed;
      }
    if (server->flags & APP_OPTIONS_FLAGS_IS_BUILTIN)
      application_local_session_connect_notify (ls);
  
    return 0;
  
  failed:
    if (!has_transport)
      segment_manager_del_segment (sm, seg);
    return rv;
  }
  
  static uword
  application_client_local_connect_key (local_session_t * ls)
  {
    return ((uword) ls->app_wrk_index << 32 | (uword) ls->session_index);
  }
  
  static void
  application_client_local_connect_key_parse (uword key, u32 * app_wrk_index,
  					    u32 * session_index)
  {
    *app_wrk_index = key >> 32;
    *session_index = key & 0xFFFFFFFF;
  }
  
  int
  application_local_session_connect_notify (local_session_t * ls)
  {
    svm_fifo_segment_private_t *seg;
    app_worker_t *client_wrk, *server_wrk;
    segment_manager_t *sm;
    application_t *client;
    int rv, is_fail = 0;
    uword client_key;
  
    client_wrk = app_worker_get (ls->client_wrk_index);
    server_wrk = app_worker_get (ls->app_wrk_index);
    client = application_get (client_wrk->app_index);
  
    sm = application_get_local_segment_manager_w_session (server_wrk, ls);
    seg = segment_manager_get_segment_w_lock (sm, ls->svm_segment_index);
    if ((rv = client->cb_fns.add_segment_callback (client->api_client_index,
  						 &seg->ssvm)))
      {
        clib_warning ("failed to notify client %u of new segment",
  		    ls->client_wrk_index);
        segment_manager_segment_reader_unlock (sm);
        application_local_session_disconnect (ls->client_wrk_index, ls);
        is_fail = 1;
      }
    else
      {
        segment_manager_segment_reader_unlock (sm);
      }
  
    client->cb_fns.session_connected_callback (client_wrk->wrk_index,
  					     ls->client_opaque,
  					     (stream_session_t *) ls,
  					     is_fail);
  
    client_key = application_client_local_connect_key (ls);
    hash_set (client_wrk->local_connects, client_key, client_key);
    return 0;
  }
  
  int
  application_local_session_cleanup (app_worker_t * client_wrk,
  				   app_worker_t * server_wrk,
  				   local_session_t * ls)
  {
    svm_fifo_segment_private_t *seg;
    segment_manager_t *sm;
    uword client_key;
    u8 has_transport;
  
    has_transport = session_has_transport ((stream_session_t *) ls);
    client_key = application_client_local_connect_key (ls);
    if (!has_transport)
      sm = application_get_local_segment_manager_w_session (server_wrk, ls);
    else
      sm = app_worker_get_listen_segment_manager (server_wrk,
  						(stream_session_t *) ls);
  
    seg = segment_manager_get_segment (sm, ls->svm_segment_index);
    if (client_wrk)
      hash_unset (client_wrk->local_connects, client_key);
  
    if (!has_transport)
      {
        application_t *server = application_get (server_wrk->app_index);
        server->cb_fns.del_segment_callback (server->api_client_index,
  					   &seg->ssvm);
        if (client_wrk)
  	{
  	  application_t *client = application_get (client_wrk->app_index);
  	  client->cb_fns.del_segment_callback (client->api_client_index,
  					       &seg->ssvm);
  	}
        segment_manager_del_segment (sm, seg);
      }
  
    application_free_local_session (server_wrk, ls);
  
    return 0;
  }
  
  int
  application_local_session_disconnect (u32 app_wrk_index, local_session_t * ls)
  {
    app_worker_t *client_wrk, *server_wrk;
  
    client_wrk = app_worker_get_if_valid (ls->client_wrk_index);
    server_wrk = app_worker_get (ls->app_wrk_index);
  
  
    if (ls->session_state == SESSION_STATE_CLOSED)
      return application_local_session_cleanup (client_wrk, server_wrk, ls);
  
    if (app_wrk_index == ls->client_wrk_index)
      {
        mq_send_local_session_disconnected_cb (ls->app_wrk_index, ls);
      }
    else
      {
        if (!client_wrk)
  	{
  	  return application_local_session_cleanup (client_wrk, server_wrk,
  						    ls);
  	}
        else if (ls->session_state < SESSION_STATE_READY)
  	{
  	  application_t *client = application_get (client_wrk->app_index);
  	  client->cb_fns.session_connected_callback (client_wrk->wrk_index,
  						     ls->client_opaque,
  						     (stream_session_t *) ls,
  						     1 /* is_fail */ );
  	  ls->session_state = SESSION_STATE_CLOSED;
  	  return application_local_session_cleanup (client_wrk, server_wrk,
  						    ls);
  	}
        else
  	{
  	  mq_send_local_session_disconnected_cb (client_wrk->wrk_index, ls);
  	}
      }
  
    ls->session_state = SESSION_STATE_CLOSED;
  
    return 0;
  }
  
  int
  application_local_session_disconnect_w_index (u32 app_wrk_index, u32 ls_index)
  {
    app_worker_t *app_wrk;
    local_session_t *ls;
    app_wrk = app_worker_get (app_wrk_index);
    ls = application_get_local_session (app_wrk, ls_index);
    return application_local_session_disconnect (app_wrk_index, ls);
  }
  
  void
  application_local_sessions_free (app_worker_t * app_wrk)
  {
    u32 index, server_wrk_index, session_index, table_index;
    segment_manager_t *sm;
    u64 handle, *handles = 0;
    local_session_t *ls, *ll;
    app_worker_t *server_wrk;
    session_endpoint_t sep;
    application_t *app;
    int i;
  
    /*
     * Local listens. Don't bother with local sessions, we clean them lower
     */
    app = application_get (app_wrk->app_index);
    table_index = application_local_session_table (app);
    /* *INDENT-OFF* */
    pool_foreach (ll, app_wrk->local_listen_sessions, ({
      application_local_listener_session_endpoint (ll, &sep);
      session_lookup_del_session_endpoint (table_index, &sep);
    }));
    /* *INDENT-ON* */
  
    /*
     * Local sessions
     */
    if (app_wrk->local_sessions)
      {
        /* *INDENT-OFF* */
        pool_foreach (ls, app_wrk->local_sessions, ({
  	application_local_session_disconnect (app_wrk->wrk_index, ls);
        }));
        /* *INDENT-ON* */
      }
  
    /*
     * Local connects
     */
    vec_reset_length (handles);
    /* *INDENT-OFF* */
    hash_foreach (handle, index, app_wrk->local_connects, ({
      vec_add1 (handles, handle);
    }));
    /* *INDENT-ON* */
  
    for (i = 0; i < vec_len (handles); i++)
      {
        application_client_local_connect_key_parse (handles[i],
  						  &server_wrk_index,
  						  &session_index);
        server_wrk = app_worker_get_if_valid (server_wrk_index);
        if (server_wrk)
  	{
  	  ls = application_get_local_session (server_wrk, session_index);
  	  application_local_session_disconnect (app_wrk->wrk_index, ls);
  	}
      }
  
    sm = segment_manager_get (app_wrk->local_segment_manager);
    sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
    segment_manager_del (sm);
  }
  
  clib_error_t *
  vnet_app_add_tls_cert (vnet_app_add_tls_cert_args_t * a)
  {
    application_t *app;
    app = application_get (a->app_index);
    if (!app)
      return clib_error_return_code (0, VNET_API_ERROR_APPLICATION_NOT_ATTACHED,
  				   0, "app %u doesn't exist", a->app_index);
    app->tls_cert = vec_dup (a->cert);
    return 0;
  }
  
  clib_error_t *
  vnet_app_add_tls_key (vnet_app_add_tls_key_args_t * a)
  {
    application_t *app;
    app = application_get (a->app_index);
    if (!app)
      return clib_error_return_code (0, VNET_API_ERROR_APPLICATION_NOT_ATTACHED,
  				   0, "app %u doesn't exist", a->app_index);
    app->tls_key = vec_dup (a->key);
    return 0;
  }
  
  u8 *
  format_app_worker_listener (u8 * s, va_list * args)
  {
    app_worker_t *app_wrk = va_arg (*args, app_worker_t *);
    u64 handle = va_arg (*args, u64);
    u32 sm_index = va_arg (*args, u32);
    int verbose = va_arg (*args, int);
    stream_session_t *listener;
    application_t *app;
    u8 *app_name, *str;
  
    if (!app_wrk)
      {
        if (verbose)
  	s = format (s, "%-40s%-25s%-15s%-15s%-10s", "Connection", "App",
  		    "API Client", "ListenerID", "SegManager");
        else
  	s = format (s, "%-40s%-25s", "Connection", "App");
  
        return s;
      }
  
    app = application_get (app_wrk->app_index);
    app_name = app_get_name_from_reg_index (app);
    listener = listen_session_get_from_handle (handle);
    str = format (0, "%U", format_stream_session, listener, verbose);
  
    if (verbose)
      {
        s = format (s, "%-40s%-25s%-15u%-15u%-10u", str, app_name,
  		  app->api_client_index, handle, sm_index);
      }
    else
      s = format (s, "%-40s%-25s", str, app_name);
  
    vec_free (app_name);
    return s;
  }
  
  static void
  application_format_listeners (application_t * app, int verbose)
  {
    vlib_main_t *vm = vlib_get_main ();
    app_worker_map_t *wrk_map;
    app_worker_t *app_wrk;
    u32 sm_index;
    u64 handle;
  
    if (!app)
      {
        vlib_cli_output (vm, "%U", format_app_worker_listener, 0 /* header */ ,
  		       0, 0, verbose);
        return;
      }
  
    /* *INDENT-OFF* */
    pool_foreach (wrk_map, app->worker_maps, ({
      app_wrk = app_worker_get (wrk_map->wrk_index);
      if (hash_elts (app_wrk->listeners_table) == 0)
        continue;
      hash_foreach (handle, sm_index, app_wrk->listeners_table, ({
        vlib_cli_output (vm, "%U", format_app_worker_listener, app_wrk,
                         handle, sm_index, verbose);
      }));
    }));
    /* *INDENT-ON* */
  }
  
  static void
  app_worker_format_connects (app_worker_t * app_wrk, int verbose)
  {
    svm_fifo_segment_private_t *fifo_segment;
    vlib_main_t *vm = vlib_get_main ();
    segment_manager_t *sm;
    u8 *app_name, *s = 0;
    application_t *app;
  
    /* Header */
    if (!app_wrk)
      {
        if (verbose)
  	vlib_cli_output (vm, "%-40s%-20s%-15s%-10s", "Connection", "App",
  			 "API Client", "SegManager");
        else
  	vlib_cli_output (vm, "%-40s%-20s", "Connection", "App");
        return;
      }
  
    app = application_get (app_wrk->app_index);
    if (app_wrk->connects_seg_manager == (u32) ~ 0)
      return;
  
    app_name = app_get_name_from_reg_index (app);
  
    /* Across all fifo segments */
    sm = segment_manager_get (app_wrk->connects_seg_manager);
  
    /* *INDENT-OFF* */
    segment_manager_foreach_segment_w_lock (fifo_segment, sm, ({
      svm_fifo_t *fifo;
      u8 *str;
  
      fifo = svm_fifo_segment_get_fifo_list (fifo_segment);
      while (fifo)
  	{
  	  u32 session_index, thread_index;
  	  stream_session_t *session;
  
  	  session_index = fifo->master_session_index;
  	  thread_index = fifo->master_thread_index;
  
  	  session = session_get (session_index, thread_index);
  	  str = format (0, "%U", format_stream_session, session, verbose);
  
  	  if (verbose)
  	    s = format (s, "%-40s%-20s%-15u%-10u", str, app_name,
  			app->api_client_index, app_wrk->connects_seg_manager);
  	  else
  	    s = format (s, "%-40s%-20s", str, app_name);
  
  	  vlib_cli_output (vm, "%v", s);
  	  vec_reset_length (s);
  	  vec_free (str);
  
  	  fifo = fifo->next;
  	}
      vec_free (s);
    }));
    /* *INDENT-ON* */
  
    vec_free (app_name);
  }
  
  static void
  application_format_connects (application_t * app, int verbose)
  {
    app_worker_map_t *wrk_map;
    app_worker_t *app_wrk;
  
    if (!app)
      {
        app_worker_format_connects (0, verbose);
        return;
      }
  
    /* *INDENT-OFF* */
    pool_foreach (wrk_map, app->worker_maps, ({
      app_wrk = app_worker_get (wrk_map->wrk_index);
      app_worker_format_connects (app_wrk, verbose);
    }));
    /* *INDENT-ON* */
  }
  
  static void
  app_worker_format_local_sessions (app_worker_t * app_wrk, int verbose)
  {
    vlib_main_t *vm = vlib_get_main ();
    local_session_t *ls;
    transport_proto_t tp;
    u8 *conn = 0;
  
    /* Header */
    if (app_wrk == 0)
      {
        vlib_cli_output (vm, "%-40s%-15s%-20s", "Connection", "ServerApp",
  		       "ClientApp");
        return;
      }
  
    if (!pool_elts (app_wrk->local_sessions)
        && !pool_elts (app_wrk->local_connects))
      return;
  
    /* *INDENT-OFF* */
    pool_foreach (ls, app_wrk->local_listen_sessions, ({
      tp = session_type_transport_proto(ls->listener_session_type);
      conn = format (0, "[L][%U] *:%u", format_transport_proto_short, tp,
                     ls->port);
      vlib_cli_output (vm, "%-40v%-15u%-20s", conn, ls->app_wrk_index, "*");
      vec_reset_length (conn);
    }));
    pool_foreach (ls, app_wrk->local_sessions, ({
      tp = session_type_transport_proto(ls->listener_session_type);
      conn = format (0, "[L][%U] *:%u", format_transport_proto_short, tp,
                     ls->port);
      vlib_cli_output (vm, "%-40v%-15u%-20u", conn, ls->app_wrk_index,
                       ls->client_wrk_index);
      vec_reset_length (conn);
    }));
    /* *INDENT-ON* */
  
    vec_free (conn);
  }
  
  static void
  application_format_local_sessions (application_t * app, int verbose)
  {
    app_worker_map_t *wrk_map;
    app_worker_t *app_wrk;
  
    if (!app)
      {
        app_worker_format_local_sessions (0, verbose);
        return;
      }
  
    /* *INDENT-OFF* */
    pool_foreach (wrk_map, app->worker_maps, ({
      app_wrk = app_worker_get (wrk_map->wrk_index);
      app_worker_format_local_sessions (app_wrk, verbose);
    }));
    /* *INDENT-ON* */
  }
  
  static void
  app_worker_format_local_connects (app_worker_t * app, int verbose)
  {
    vlib_main_t *vm = vlib_get_main ();
    u32 app_wrk_index, session_index;
    app_worker_t *server_wrk;
    local_session_t *ls;
    uword client_key;
    u64 value;
  
    /* Header */
    if (app == 0)
      {
        if (verbose)
  	vlib_cli_output (vm, "%-40s%-15s%-20s%-10s", "Connection", "App",
  			 "Peer App", "SegManager");
        else
  	vlib_cli_output (vm, "%-40s%-15s%-20s", "Connection", "App",
  			 "Peer App");
        return;
      }
  
    if (!app->local_connects)
      return;
  
    /* *INDENT-OFF* */
    hash_foreach (client_key, value, app->local_connects, ({
      application_client_local_connect_key_parse (client_key, &app_wrk_index,
                                                  &session_index);
      server_wrk = app_worker_get (app_wrk_index);
      ls = application_get_local_session (server_wrk, session_index);
      vlib_cli_output (vm, "%-40s%-15s%-20s", "TODO", ls->app_wrk_index,
                       ls->client_wrk_index);
    }));
    /* *INDENT-ON* */
  }
  
  static void
  application_format_local_connects (application_t * app, int verbose)
  {
    app_worker_map_t *wrk_map;
    app_worker_t *app_wrk;
  
    if (!app)
      {
        app_worker_format_local_connects (0, verbose);
        return;
      }
  
    /* *INDENT-OFF* */
    pool_foreach (wrk_map, app->worker_maps, ({
      app_wrk = app_worker_get (wrk_map->wrk_index);
      app_worker_format_local_connects (app_wrk, verbose);
    }));
    /* *INDENT-ON* */
  }
  
  u8 *
  format_application (u8 * s, va_list * args)
  {
    application_t *app = va_arg (*args, application_t *);
    CLIB_UNUSED (int verbose) = va_arg (*args, int);
    segment_manager_properties_t *props;
    const u8 *app_ns_name;
    u8 *app_name;
  
    if (app == 0)
      {
        if (verbose)
  	s = format (s, "%-10s%-20s%-15s%-15s%-15s%-15s%-15s", "Index", "Name",
  		    "API Client", "Namespace", "Add seg size", "Rx-f size",
  		    "Tx-f size");
        else
  	s = format (s, "%-10s%-20s%-15s%-40s", "Index", "Name", "API Client",
  		    "Namespace");
        return s;
      }
  
    app_name = app_get_name (app);
    app_ns_name = app_namespace_id_from_index (app->ns_index);
    props = application_segment_manager_properties (app);
    if (verbose)
      s = format (s, "%-10u%-20s%-15d%-15u%-15U%-15U%-15U", app->app_index,
  		app_name, app->api_client_index, app->ns_index,
  		format_memory_size, props->add_segment_size,
  		format_memory_size, props->rx_fifo_size, format_memory_size,
  		props->tx_fifo_size);
    else
      s = format (s, "%-10u%-20s%-15d%-40s", app->app_index, app_name,
  		app->api_client_index, app_ns_name);
    return s;
  }
  
  void
  application_format_all_listeners (vlib_main_t * vm, int do_local, int verbose)
  {
    application_t *app;
  
    if (!pool_elts (app_main.app_pool))
      {
        vlib_cli_output (vm, "No active server bindings");
        return;
      }
  
    if (do_local)
      {
        application_format_local_sessions (0, verbose);
        /* *INDENT-OFF* */
        pool_foreach (app, app_main.app_pool, ({
          application_format_local_sessions (app, verbose);
        }));
        /* *INDENT-ON* */
      }
    else
      {
        application_format_listeners (0, verbose);
  
        /* *INDENT-OFF* */
        pool_foreach (app, app_main.app_pool, ({
          application_format_listeners (app, verbose);
        }));
        /* *INDENT-ON* */
      }
  }
  
  void
  application_format_all_clients (vlib_main_t * vm, int do_local, int verbose)
  {
    application_t *app;
  
    if (!pool_elts (app_main.app_pool))
      {
        vlib_cli_output (vm, "No active apps");
        return;
      }
  
    if (do_local)
      {
        application_format_local_connects (0, verbose);
  
        /* *INDENT-OFF* */
        pool_foreach (app, app_main.app_pool, ({
  	application_format_local_connects (app, verbose);
        }));
        /* *INDENT-ON* */
      }
    else
      {
        application_format_connects (0, verbose);
  
        /* *INDENT-OFF* */
        pool_foreach (app, app_main.app_pool, ({
          application_format_connects (app, verbose);
        }));
        /* *INDENT-ON* */
      }
  }
  
  static clib_error_t *
  show_app_command_fn (vlib_main_t * vm, unformat_input_t * input,
  		     vlib_cli_command_t * cmd)
  {
    int do_server = 0, do_client = 0, do_local = 0;
    application_t *app;
    int verbose = 0;
  
    session_cli_return_if_not_enabled ();
  
    while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
      {
        if (unformat (input, "server"))
  	do_server = 1;
        else if (unformat (input, "client"))
  	do_client = 1;
        else if (unformat (input, "local"))
  	do_local = 1;
        else if (unformat (input, "verbose"))
  	verbose = 1;
        else
  	break;
      }
  
    if (do_server)
      application_format_all_listeners (vm, do_local, verbose);
  
    if (do_client)
      application_format_all_clients (vm, do_local, verbose);
  
    /* Print app related info */
    if (!do_server && !do_client)
      {
        vlib_cli_output (vm, "%U", format_application, 0, verbose);
        /* *INDENT-OFF* */
        pool_foreach (app, app_main.app_pool, ({
  	vlib_cli_output (vm, "%U", format_application, app, verbose);
        }));
        /* *INDENT-ON* */
      }
  
    return 0;
  }
  
  /* *INDENT-OFF* */
  VLIB_CLI_COMMAND (show_app_command, static) =
  {
    .path = "show app",
    .short_help = "show app [server|client] [verbose]",
    .function = show_app_command_fn,
  };
  /* *INDENT-ON* */
  
  /*
   * fd.io coding-style-patch-verification: ON
   *
   * Local Variables:
   * eval: (c-set-style "gnu")
   * End:
   */
  