vcl: move binary api and cfg to separate files

Change-Id: Ib88d703bb7d4b170059960b0688352c90c5fcc39
Signed-off-by: Florin Coras <fcoras@cisco.com>

5 files changed, 2077 insertions, 1951 deletions

diff --git a/src/vcl/vcl_bapi.c b/src/vcl/vcl_bapi.c
new file mode 100644
index 00000000000..cc3179d860a
--- /dev/null
+++ b/src/vcl/vcl_bapi.c
@@ -0,0 +1,731 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this
+ * 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 <vcl/vcl_private.h>
+#include <vlibmemory/api.h>
+#include <vpp/api/vpe_msg_enum.h>
+
+#define vl_typedefs		/* define message structures */
+#include <vpp/api/vpe_all_api_h.h>
+#undef vl_typedefs
+
+/* declare message handlers for each api */
+
+#define vl_endianfun		/* define message structures */
+#include <vpp/api/vpe_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...)
+#define vl_printfun
+#include <vpp/api/vpe_all_api_h.h>
+#undef vl_printfun
+
+static u8 *
+format_api_error (u8 * s, va_list * args)
+{
+  i32 error = va_arg (*args, u32);
+  uword *p;
+
+  p = hash_get (vcm->error_string_by_error_number, -error);
+
+  if (p)
+    s = format (s, "%s (%d)", p[0], error);
+  else
+    s = format (s, "%d", error);
+  return s;
+}
+
+static void
+  vl_api_session_enable_disable_reply_t_handler
+  (vl_api_session_enable_disable_reply_t * mp)
+{
+  if (mp->retval)
+    {
+      clib_warning ("VCL<%d>: session_enable_disable failed: %U", getpid (),
+		    format_api_error, ntohl (mp->retval));
+    }
+  else
+    vcm->app_state = STATE_APP_ENABLED;
+}
+
+static void
+vl_api_application_attach_reply_t_handler (vl_api_application_attach_reply_t *
+					   mp)
+{
+  static svm_fifo_segment_create_args_t _a;
+  svm_fifo_segment_create_args_t *a = &_a;
+  int rv;
+
+  memset (a, 0, sizeof (*a));
+  if (mp->retval)
+    {
+      clib_warning ("VCL<%d>: attach failed: %U", getpid (),
+		    format_api_error, ntohl (mp->retval));
+      return;
+    }
+
+  if (mp->segment_name_length == 0)
+    {
+      clib_warning ("VCL<%d>: segment_name_length zero", getpid ());
+      return;
+    }
+
+  a->segment_name = (char *) mp->segment_name;
+  a->segment_size = mp->segment_size;
+
+  ASSERT (mp->app_event_queue_address);
+
+  /* Attach to the segment vpp created */
+  rv = svm_fifo_segment_attach (a);
+  vec_reset_length (a->new_segment_indices);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_warning ("VCL<%d>: svm_fifo_segment_attach ('%s') failed",
+		    getpid (), mp->segment_name);
+      return;
+    }
+
+  vcm->app_event_queue =
+    uword_to_pointer (mp->app_event_queue_address, svm_queue_t *);
+
+  vcm->app_state = STATE_APP_ATTACHED;
+}
+
+static void
+vl_api_application_detach_reply_t_handler (vl_api_application_detach_reply_t *
+					   mp)
+{
+  if (mp->retval)
+    clib_warning ("VCL<%d>: detach failed: %U", getpid (), format_api_error,
+		  ntohl (mp->retval));
+
+  vcm->app_state = STATE_APP_ENABLED;
+}
+
+static void
+vl_api_disconnect_session_reply_t_handler (vl_api_disconnect_session_reply_t *
+					   mp)
+{
+  if (mp->retval)
+    clib_warning ("VCL<%d>: vpp handle 0x%llx: disconnect session failed: %U",
+		  getpid (), mp->handle, format_api_error,
+		  ntohl (mp->retval));
+}
+
+static void
+vl_api_map_another_segment_t_handler (vl_api_map_another_segment_t * mp)
+{
+  static svm_fifo_segment_create_args_t _a;
+  svm_fifo_segment_create_args_t *a = &_a;
+  int rv;
+
+  memset (a, 0, sizeof (*a));
+  a->segment_name = (char *) mp->segment_name;
+  a->segment_size = mp->segment_size;
+  /* Attach to the segment vpp created */
+  rv = svm_fifo_segment_attach (a);
+  vec_reset_length (a->new_segment_indices);
+  if (PREDICT_FALSE (rv))
+    {
+      clib_warning ("VCL<%d>: svm_fifo_segment_attach ('%s') failed",
+		    getpid (), mp->segment_name);
+      return;
+    }
+
+  VDBG (1, "VCL<%d>: mapped new segment '%s' size %d", getpid (),
+	mp->segment_name, mp->segment_size);
+}
+
+static void
+vl_api_unmap_segment_t_handler (vl_api_unmap_segment_t * mp)
+{
+
+/*
+ * XXX Need segment_name to session_id hash,
+ * XXX - have sessionID by handle hash currently
+ */
+
+  VDBG (1, "Unmapped segment '%s'", mp->segment_name);
+}
+
+static void
+vl_api_disconnect_session_t_handler (vl_api_disconnect_session_t * mp)
+{
+  uword *p;
+
+  p = hash_get (vcm->session_index_by_vpp_handles, mp->handle);
+  if (p)
+    {
+      int rv;
+      vcl_session_t *session = 0;
+      u32 session_index = p[0];
+
+      VCL_SESSION_LOCK_AND_GET (session_index, &session);
+      session->session_state = STATE_CLOSE_ON_EMPTY;
+
+      VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: setting state to 0x%x "
+	    "(%s)", getpid (), mp->handle, session_index,
+	    session->session_state,
+	    vppcom_session_state_str (session->session_state));
+      VCL_SESSION_UNLOCK ();
+      return;
+
+    done:
+      VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: session lookup failed!",
+	    getpid (), mp->handle, session_index);
+    }
+  else
+    clib_warning ("VCL<%d>: vpp handle 0x%llx: session lookup by "
+		  "handle failed!", getpid (), mp->handle);
+}
+
+static void
+vl_api_reset_session_t_handler (vl_api_reset_session_t * mp)
+{
+  vcl_session_t *session = 0;
+  vl_api_reset_session_reply_t *rmp;
+  uword *p;
+  int rv = 0;
+
+  p = hash_get (vcm->session_index_by_vpp_handles, mp->handle);
+  if (p)
+    {
+      int rval;
+      VCL_SESSION_LOCK ();
+      rval = vppcom_session_at_index (p[0], &session);
+      if (PREDICT_FALSE (rval))
+	{
+	  rv = VNET_API_ERROR_INVALID_VALUE_2;
+	  clib_warning ("VCL<%d>: ERROR: vpp handle 0x%llx, sid %u: "
+			"session lookup failed! returning %d %U",
+			getpid (), mp->handle, p[0],
+			rv, format_api_error, rv);
+	}
+      else
+	{
+	  /* TBD: should this disconnect immediately and
+	   * flush the fifos?
+	   */
+	  session->session_state = STATE_CLOSE_ON_EMPTY;
+
+	  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: state set to %d "
+		"(%s)!", getpid (), mp->handle, p[0], session->session_state,
+		vppcom_session_state_str (session->session_state));
+	}
+      VCL_SESSION_UNLOCK ();
+    }
+  else
+    {
+      rv = VNET_API_ERROR_INVALID_VALUE;
+      clib_warning ("VCL<%d>: ERROR: vpp handle 0x%llx: session lookup "
+		    "failed! returning %d %U",
+		    getpid (), mp->handle, rv, format_api_error, rv);
+    }
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_RESET_SESSION_REPLY);
+  rmp->retval = htonl (rv);
+  rmp->handle = mp->handle;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & rmp);
+}
+
+static void
+vl_api_connect_session_reply_t_handler (vl_api_connect_session_reply_t * mp)
+{
+  vcl_session_t *session = 0;
+  u32 session_index;
+  svm_fifo_t *rx_fifo, *tx_fifo;
+  int rv = VPPCOM_OK;
+
+  session_index = mp->context;
+  VCL_SESSION_LOCK_AND_GET (session_index, &session);
+done:
+  if (mp->retval)
+    {
+      clib_warning ("VCL<%d>: ERROR: vpp handle 0x%llx, sid %u: "
+		    "connect failed! %U",
+		    getpid (), mp->handle, session_index,
+		    format_api_error, ntohl (mp->retval));
+      if (session)
+	{
+	  session->session_state = STATE_FAILED;
+	  session->vpp_handle = mp->handle;
+	}
+      else
+	{
+	  clib_warning ("[%s] ERROR: vpp handle 0x%llx, sid %u: "
+			"Invalid session index (%u)!",
+			getpid (), mp->handle, session_index);
+	}
+      goto done_unlock;
+    }
+
+  if (rv)
+    goto done_unlock;
+
+  /*
+   * Setup session
+   */
+  if (vcm->session_io_thread.io_sessions_lockp)
+    {
+      // Add this connection to the active io sessions list
+      VCL_IO_SESSIONS_LOCK ();
+      u32 *active_session_index;
+      pool_get (vcm->session_io_thread.active_session_indexes,
+		active_session_index);
+      *active_session_index = session_index;
+      VCL_IO_SESSIONS_UNLOCK ();
+    }
+  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
+					 svm_queue_t *);
+
+  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
+  rx_fifo->client_session_index = session_index;
+  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
+  tx_fifo->client_session_index = session_index;
+
+  session->rx_fifo = rx_fifo;
+  session->tx_fifo = tx_fifo;
+  session->vpp_handle = mp->handle;
+  session->transport.is_ip4 = mp->is_ip4;
+  clib_memcpy (&session->transport.lcl_ip, mp->lcl_ip,
+	       sizeof (session->transport.rmt_ip));
+  session->transport.lcl_port = mp->lcl_port;
+  session->session_state = STATE_CONNECT;
+
+  /* Add it to lookup table */
+  hash_set (vcm->session_index_by_vpp_handles, mp->handle, session_index);
+
+  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: connect succeeded! "
+	"session_rx_fifo %p, refcnt %d, session_tx_fifo %p, refcnt %d",
+	getpid (), mp->handle, session_index, session->rx_fifo,
+	session->rx_fifo->refcnt, session->tx_fifo, session->tx_fifo->refcnt);
+done_unlock:
+  VCL_SESSION_UNLOCK ();
+}
+
+static void
+vl_api_bind_sock_reply_t_handler (vl_api_bind_sock_reply_t * mp)
+{
+  vcl_session_t *session = 0;
+  u32 session_index = mp->context;
+  int rv;
+
+  VCL_SESSION_LOCK_AND_GET (session_index, &session);
+done:
+  if (mp->retval)
+    {
+      clib_warning ("VCL<%d>: ERROR: vpp handle 0x%llx, "
+		    "sid %u: bind failed: %U",
+		    getpid (), mp->handle, session_index,
+		    format_api_error, ntohl (mp->retval));
+      rv = vppcom_session_at_index (session_index, &session);
+      if (rv == VPPCOM_OK)
+	{
+	  session->session_state = STATE_FAILED;
+	  session->vpp_handle = mp->handle;
+	}
+      else
+	{
+	  clib_warning ("[%s] ERROR: vpp handle 0x%llx, sid %u: "
+			"Invalid session index (%u)!",
+			getpid (), mp->handle, session_index);
+	}
+      goto done_unlock;
+    }
+
+  session->vpp_handle = mp->handle;
+  session->transport.is_ip4 = mp->lcl_is_ip4;
+  session->transport.lcl_ip = to_ip46 (mp->lcl_is_ip4 ? IP46_TYPE_IP4 :
+				       IP46_TYPE_IP6, mp->lcl_ip);
+  session->transport.lcl_port = mp->lcl_port;
+  vppcom_session_table_add_listener (mp->handle, session_index);
+  session->session_state = STATE_LISTEN;
+
+  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: bind succeeded!",
+	getpid (), mp->handle, mp->context);
+done_unlock:
+  VCL_SESSION_UNLOCK ();
+}
+
+static void
+vl_api_unbind_sock_reply_t_handler (vl_api_unbind_sock_reply_t * mp)
+{
+  if (mp->retval)
+    clib_warning ("VCL<%d>: ERROR: sid %u: unbind failed: %U",
+		  getpid (), mp->context, format_api_error,
+		  ntohl (mp->retval));
+
+  else
+    VDBG (1, "VCL<%d>: sid %u: unbind succeeded!", getpid (), mp->context);
+}
+
+static void
+vl_api_accept_session_t_handler (vl_api_accept_session_t * mp)
+{
+  svm_fifo_t *rx_fifo, *tx_fifo;
+  vcl_session_t *session, *listen_session;
+  u32 session_index;
+  vce_event_connect_request_t *ecr;
+  vce_event_t *ev;
+  int rv;
+  u32 ev_idx;
+  uword elts = 0;
+
+  VCL_SESSION_LOCK ();
+
+  VCL_ACCEPT_FIFO_LOCK ();
+  elts = clib_fifo_free_elts (vcm->client_session_index_fifo);
+  VCL_ACCEPT_FIFO_UNLOCK ();
+
+  if (!elts)
+    {
+      clib_warning ("VCL<%d>: client session queue is full!", getpid ());
+      vppcom_send_accept_session_reply (mp->handle, mp->context,
+					VNET_API_ERROR_QUEUE_FULL);
+      VCL_SESSION_UNLOCK ();
+      return;
+    }
+
+  listen_session = vppcom_session_table_lookup_listener (mp->listener_handle);
+  if (!listen_session)
+    {
+      clib_warning ("VCL<%d>: ERROR: couldn't find listen session: "
+		    "unknown vpp listener handle %llx",
+		    getpid (), mp->listener_handle);
+      vppcom_send_accept_session_reply (mp->handle, mp->context,
+					VNET_API_ERROR_INVALID_ARGUMENT);
+      VCL_SESSION_UNLOCK ();
+      return;
+    }
+
+  /* TODO check listener depth and update */
+  /* TODO on "child" fd close, update listener depth */
+
+  /* Allocate local session and set it up */
+  pool_get (vcm->sessions, session);
+  memset (session, 0, sizeof (*session));
+  session_index = (u32) (session - vcm->sessions);
+
+  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
+  rx_fifo->client_session_index = session_index;
+  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
+  tx_fifo->client_session_index = session_index;
+
+  session->vpp_handle = mp->handle;
+  session->client_context = mp->context;
+  session->rx_fifo = rx_fifo;
+  session->tx_fifo = tx_fifo;
+  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
+					 svm_queue_t *);
+  session->session_state = STATE_ACCEPT;
+  session->transport.rmt_port = mp->port;
+  session->transport.is_ip4 = mp->is_ip4;
+  session->transport.rmt_ip = to_ip46 (mp->is_ip4 ? IP46_TYPE_IP4 :
+				       IP46_TYPE_IP6, mp->ip);
+
+  /* Add it to lookup table */
+  hash_set (vcm->session_index_by_vpp_handles, mp->handle, session_index);
+  session->transport.lcl_port = listen_session->transport.lcl_port;
+  session->transport.lcl_ip = listen_session->transport.lcl_ip;
+
+  /* Create an event for handlers */
+
+  VCL_EVENTS_LOCK ();
+
+  pool_get (vcm->event_thread.vce_events, ev);
+  ev_idx = (u32) (ev - vcm->event_thread.vce_events);
+  ecr = vce_get_event_data (ev, sizeof (*ecr));
+  ev->evk.eid = VCL_EVENT_CONNECT_REQ_ACCEPTED;
+  listen_session = vppcom_session_table_lookup_listener (mp->listener_handle);
+  ev->evk.session_index = (u32) (listen_session - vcm->sessions);
+  ecr->accepted_session_index = session_index;
+
+  VCL_EVENTS_UNLOCK ();
+
+  rv = vce_generate_event (&vcm->event_thread, ev_idx);
+  ASSERT (rv == 0);
+
+  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: client accept request from %s"
+	" address %U port %d queue %p!", getpid (), mp->handle, session_index,
+	mp->is_ip4 ? "IPv4" : "IPv6", format_ip46_address, &mp->ip,
+	mp->is_ip4 ? IP46_TYPE_IP4 : IP46_TYPE_IP6,
+	clib_net_to_host_u16 (mp->port), session->vpp_evt_q);
+
+  vcl_evt (VCL_EVT_ACCEPT, session, listen_session, session_index);
+  VCL_SESSION_UNLOCK ();
+}
+
+#define foreach_sock_msg                                        \
+_(SESSION_ENABLE_DISABLE_REPLY, session_enable_disable_reply)   \
+_(BIND_SOCK_REPLY, bind_sock_reply)                             \
+_(UNBIND_SOCK_REPLY, unbind_sock_reply)                         \
+_(ACCEPT_SESSION, accept_session)                               \
+_(CONNECT_SESSION_REPLY, connect_session_reply)                 \
+_(DISCONNECT_SESSION, disconnect_session)                       \
+_(DISCONNECT_SESSION_REPLY, disconnect_session_reply)           \
+_(RESET_SESSION, reset_session)                                 \
+_(APPLICATION_ATTACH_REPLY, application_attach_reply)           \
+_(APPLICATION_DETACH_REPLY, application_detach_reply)           \
+_(MAP_ANOTHER_SEGMENT, map_another_segment)                     \
+_(UNMAP_SEGMENT, unmap_segment)
+
+void
+vppcom_api_hookup (void)
+{
+#define _(N, n)                                                  \
+    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
+                           vl_api_##n##_t_handler,              \
+                           vl_noop_handler,                     \
+                           vl_api_##n##_t_endian,               \
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 1);
+  foreach_sock_msg;
+#undef _
+}
+
+/*
+ * VPP-API message functions
+ */
+void
+vppcom_send_session_enable_disable (u8 is_enable)
+{
+  vl_api_session_enable_disable_t *bmp;
+  bmp = vl_msg_api_alloc (sizeof (*bmp));
+  memset (bmp, 0, sizeof (*bmp));
+
+  bmp->_vl_msg_id = ntohs (VL_API_SESSION_ENABLE_DISABLE);
+  bmp->client_index = vcm->my_client_index;
+  bmp->context = htonl (0xfeedface);
+  bmp->is_enable = is_enable;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
+}
+
+void
+vppcom_app_send_attach (void)
+{
+  vl_api_application_attach_t *bmp;
+  u8 nsid_len = vec_len (vcm->cfg.namespace_id);
+  u8 app_is_proxy = (vcm->cfg.app_proxy_transport_tcp ||
+		     vcm->cfg.app_proxy_transport_udp);
+
+  bmp = vl_msg_api_alloc (sizeof (*bmp));
+  memset (bmp, 0, sizeof (*bmp));
+
+  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_ATTACH);
+  bmp->client_index = vcm->my_client_index;
+  bmp->context = htonl (0xfeedface);
+  bmp->options[APP_OPTIONS_FLAGS] =
+    APP_OPTIONS_FLAGS_ACCEPT_REDIRECT | APP_OPTIONS_FLAGS_ADD_SEGMENT |
+    (vcm->cfg.app_scope_local ? APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE : 0) |
+    (vcm->cfg.app_scope_global ? APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE : 0) |
+    (app_is_proxy ? APP_OPTIONS_FLAGS_IS_PROXY : 0);
+  bmp->options[APP_OPTIONS_PROXY_TRANSPORT] =
+    (u64) ((vcm->cfg.app_proxy_transport_tcp ? 1 << TRANSPORT_PROTO_TCP : 0) |
+	   (vcm->cfg.app_proxy_transport_udp ? 1 << TRANSPORT_PROTO_UDP : 0));
+  bmp->options[APP_OPTIONS_SEGMENT_SIZE] = vcm->cfg.segment_size;
+  bmp->options[APP_OPTIONS_ADD_SEGMENT_SIZE] = vcm->cfg.add_segment_size;
+  bmp->options[APP_OPTIONS_RX_FIFO_SIZE] = vcm->cfg.rx_fifo_size;
+  bmp->options[APP_OPTIONS_TX_FIFO_SIZE] = vcm->cfg.tx_fifo_size;
+  bmp->options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] =
+    vcm->cfg.preallocated_fifo_pairs;
+  bmp->options[APP_OPTIONS_EVT_QUEUE_SIZE] = vcm->cfg.event_queue_size;
+  if (nsid_len)
+    {
+      bmp->namespace_id_len = nsid_len;
+      clib_memcpy (bmp->namespace_id, vcm->cfg.namespace_id, nsid_len);
+      bmp->options[APP_OPTIONS_NAMESPACE_SECRET] = vcm->cfg.namespace_secret;
+    }
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
+}
+
+void
+vppcom_app_send_detach (void)
+{
+  vl_api_application_detach_t *bmp;
+  bmp = vl_msg_api_alloc (sizeof (*bmp));
+  memset (bmp, 0, sizeof (*bmp));
+
+  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_DETACH);
+  bmp->client_index = vcm->my_client_index;
+  bmp->context = htonl (0xfeedface);
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
+}
+
+void
+vppcom_send_connect_sock (vcl_session_t * session, u32 session_index)
+{
+  vl_api_connect_sock_t *cmp;
+
+  /* Assumes caller as acquired the spinlock: vcm->sessions_lockp */
+  cmp = vl_msg_api_alloc (sizeof (*cmp));
+  memset (cmp, 0, sizeof (*cmp));
+  cmp->_vl_msg_id = ntohs (VL_API_CONNECT_SOCK);
+  cmp->client_index = vcm->my_client_index;
+  cmp->context = session_index;
+
+  cmp->is_ip4 = session->transport.is_ip4;
+  clib_memcpy (cmp->ip, &session->transport.rmt_ip, sizeof (cmp->ip));
+  cmp->port = session->transport.rmt_port;
+  cmp->proto = session->session_type;
+  clib_memcpy (cmp->options, session->options, sizeof (cmp->options));
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & cmp);
+}
+
+void
+vppcom_send_disconnect_session_reply (u64 vpp_handle, u32 session_index,
+				      int rv)
+{
+  vl_api_disconnect_session_reply_t *rmp;
+
+  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: sending disconnect msg",
+	getpid (), vpp_handle, session_index);
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  memset (rmp, 0, sizeof (*rmp));
+
+  rmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION_REPLY);
+  rmp->retval = htonl (rv);
+  rmp->handle = vpp_handle;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & rmp);
+}
+
+void
+vppcom_send_disconnect_session (u64 vpp_handle, u32 session_index)
+{
+  vl_api_disconnect_session_t *dmp;
+
+  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: sending disconnect msg",
+	getpid (), vpp_handle, session_index);
+
+  dmp = vl_msg_api_alloc (sizeof (*dmp));
+  memset (dmp, 0, sizeof (*dmp));
+  dmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION);
+  dmp->client_index = vcm->my_client_index;
+  dmp->handle = vpp_handle;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & dmp);
+}
+
+/* VPP combines bind and listen as one operation. VCL manages the separation
+ * of bind and listen locally via vppcom_session_bind() and
+ * vppcom_session_listen() */
+void
+vppcom_send_bind_sock (vcl_session_t * session, u32 session_index)
+{
+  vl_api_bind_sock_t *bmp;
+
+  /* Assumes caller has acquired spinlock: vcm->sessions_lockp */
+  bmp = vl_msg_api_alloc (sizeof (*bmp));
+  memset (bmp, 0, sizeof (*bmp));
+
+  bmp->_vl_msg_id = ntohs (VL_API_BIND_SOCK);
+  bmp->client_index = vcm->my_client_index;
+  bmp->context = session_index;
+  bmp->is_ip4 = session->transport.is_ip4;
+  clib_memcpy (bmp->ip, &session->transport.lcl_ip, sizeof (bmp->ip));
+  bmp->port = session->transport.lcl_port;
+  bmp->proto = session->session_type;
+  clib_memcpy (bmp->options, session->options, sizeof (bmp->options));
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
+}
+
+void
+vppcom_send_unbind_sock (u64 vpp_handle)
+{
+  vl_api_unbind_sock_t *ump;
+
+  ump = vl_msg_api_alloc (sizeof (*ump));
+  memset (ump, 0, sizeof (*ump));
+
+  ump->_vl_msg_id = ntohs (VL_API_UNBIND_SOCK);
+  ump->client_index = vcm->my_client_index;
+  ump->handle = vpp_handle;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & ump);
+}
+
+void
+vppcom_send_accept_session_reply (u64 handle, u32 context, int retval)
+{
+  vl_api_accept_session_reply_t *rmp;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_ACCEPT_SESSION_REPLY);
+  rmp->retval = htonl (retval);
+  rmp->context = context;
+  rmp->handle = handle;
+  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & rmp);
+}
+
+u32
+vcl_max_nsid_len (void)
+{
+  vl_api_application_attach_t *mp;
+  return (sizeof (mp->namespace_id) - 1);
+}
+
+void
+vppcom_init_error_string_table (void)
+{
+  vcm->error_string_by_error_number = hash_create (0, sizeof (uword));
+
+#define _(n, v, s) hash_set (vcm->error_string_by_error_number, -v, s);
+  foreach_vnet_api_error;
+#undef _
+
+  hash_set (vcm->error_string_by_error_number, 99, "Misc");
+}
+
+int
+vppcom_connect_to_vpp (char *app_name)
+{
+  api_main_t *am = &api_main;
+  vppcom_cfg_t *vcl_cfg = &vcm->cfg;
+  int rv = VPPCOM_OK;
+
+  if (!vcl_cfg->vpp_api_filename)
+    vcl_cfg->vpp_api_filename = format (0, "/vpe-api%c", 0);
+
+  VDBG (0, "VCL<%d>: app (%s) connecting to VPP api (%s)...",
+	getpid (), app_name, vcl_cfg->vpp_api_filename);
+
+  if (vl_client_connect_to_vlib ((char *) vcl_cfg->vpp_api_filename, app_name,
+				 vcm->cfg.vpp_api_q_length) < 0)
+    {
+      clib_warning ("VCL<%d>: app (%s) connect failed!", getpid (), app_name);
+      rv = VPPCOM_ECONNREFUSED;
+    }
+  else
+    {
+      vcm->vl_input_queue = am->shmem_hdr->vl_input_queue;
+      vcm->my_client_index = (u32) am->my_client_index;
+      vcm->app_state = STATE_APP_CONN_VPP;
+
+      VDBG (0, "VCL<%d>: app (%s) is connected to VPP!", getpid (), app_name);
+    }
+
+  vcl_evt (VCL_EVT_INIT, vcm);
+  return rv;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vcl/vcl_cfg.c b/src/vcl/vcl_cfg.c
new file mode 100644
index 00000000000..338a6fa6165
--- /dev/null
+++ b/src/vcl/vcl_cfg.c
@@ -0,0 +1,610 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this
+ * 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 <vcl/vcl_private.h>
+
+/* NOTE: _vppcom_main is only used until the heap is allocated.
+ *       Do not access it directly -- use vcm which will point to
+ *       the heap allocated copy after init.
+ */
+static vppcom_main_t _vppcom_main = {
+  .debug = VPPCOM_DEBUG_INIT,
+  .my_client_index = ~0
+};
+
+vppcom_main_t *vcm = &_vppcom_main;
+
+void
+vppcom_cfg_init (vppcom_cfg_t * vcl_cfg)
+{
+  char *env_var_str;
+
+  ASSERT (vcl_cfg);
+
+  vcl_cfg->heapsize = (256ULL << 20);
+  vcl_cfg->vpp_api_q_length = 1024;
+  vcl_cfg->segment_baseva = 0x200000000ULL;
+  vcl_cfg->segment_size = (256 << 20);
+  vcl_cfg->add_segment_size = (128 << 20);
+  vcl_cfg->preallocated_fifo_pairs = 8;
+  vcl_cfg->rx_fifo_size = (1 << 20);
+  vcl_cfg->tx_fifo_size = (1 << 20);
+  vcl_cfg->event_queue_size = 2048;
+  vcl_cfg->listen_queue_size = CLIB_CACHE_LINE_BYTES / sizeof (u32);
+  vcl_cfg->app_timeout = 10 * 60.0;
+  vcl_cfg->session_timeout = 10 * 60.0;
+  vcl_cfg->accept_timeout = 60.0;
+  vcl_cfg->event_ring_size = (128 << 10);
+  vcl_cfg->event_log_path = "/dev/shm";
+
+  env_var_str = getenv (VPPCOM_ENV_DEBUG);
+  if (env_var_str)
+    {
+      u32 tmp;
+      if (sscanf (env_var_str, "%u", &tmp) != 1)
+	clib_warning ("VCL<%d>: WARNING: Invalid debug level specified in the"
+		      " environment variable " VPPCOM_ENV_DEBUG " (%s)!\n",
+		      getpid (), env_var_str);
+      else
+	{
+	  vcm->debug = tmp;
+	  VDBG (0, "VCL<%d>: configured VCL debug level (%u) from "
+		VPPCOM_ENV_DEBUG "!", getpid (), vcm->debug);
+	}
+    }
+}
+
+void
+vppcom_cfg_heapsize (char *conf_fname)
+{
+  vppcom_cfg_t *vcl_cfg = &vcm->cfg;
+  FILE *fp;
+  char inbuf[4096];
+  int argc = 1;
+  char **argv = NULL;
+  char *arg = NULL;
+  char *p;
+  int i;
+  u8 *sizep;
+  u32 size;
+  void *vcl_mem;
+  void *heap;
+
+  fp = fopen (conf_fname, "r");
+  if (fp == NULL)
+    {
+      VDBG (0, "VCL<%d>: using default heapsize %lld (0x%llx)", getpid (),
+	    vcl_cfg->heapsize, vcl_cfg->heapsize);
+      goto defaulted;
+    }
+
+  argv = calloc (1, sizeof (char *));
+  if (argv == NULL)
+    {
+      VDBG (0, "VCL<%d>: calloc failed, using default heapsize %lld (0x%llx)",
+	    getpid (), vcl_cfg->heapsize, vcl_cfg->heapsize);
+      goto defaulted;
+    }
+
+  while (1)
+    {
+      if (fgets (inbuf, 4096, fp) == 0)
+	break;
+      p = strtok (inbuf, " \t\n");
+      while (p != NULL)
+	{
+	  if (*p == '#')
+	    break;
+	  argc++;
+	  char **tmp = realloc (argv, argc * sizeof (char *));
+	  if (tmp == NULL)
+	    {
+	      VDBG (0, "VCL<%d>: realloc failed, using default heapsize %lld "
+		    "(0x%llx)", getpid (), vcl_cfg->heapsize,
+		    vcl_cfg->heapsize);
+	      goto defaulted;
+	    }
+	  argv = tmp;
+	  arg = strndup (p, 1024);
+	  if (arg == NULL)
+	    {
+	      VDBG (0, "VCL<%d>: strndup failed, using default heapsize %lld "
+		    "(0x%llx)", getpid (), vcl_cfg->heapsize,
+		    vcl_cfg->heapsize);
+	      goto defaulted;
+	    }
+	  argv[argc - 1] = arg;
+	  p = strtok (NULL, " \t\n");
+	}
+    }
+
+  fclose (fp);
+  fp = NULL;
+
+  char **tmp = realloc (argv, (argc + 1) * sizeof (char *));
+  if (tmp == NULL)
+    {
+      VDBG (0, "VCL<%d>: realloc failed, using default heapsize %lld "
+	    "(0x%llx)", getpid (), vcl_cfg->heapsize, vcl_cfg->heapsize);
+      goto defaulted;
+    }
+  argv = tmp;
+  argv[argc] = NULL;
+
+  /*
+   * Look for and parse the "heapsize" config parameter.
+   * Manual since none of the clib infra has been bootstrapped yet.
+   *
+   * Format: heapsize <nn>[mM][gG]
+   */
+
+  for (i = 1; i < (argc - 1); i++)
+    {
+      if (!strncmp (argv[i], "heapsize", 8))
+	{
+	  sizep = (u8 *) argv[i + 1];
+	  size = 0;
+	  while (*sizep >= '0' && *sizep <= '9')
+	    {
+	      size *= 10;
+	      size += *sizep++ - '0';
+	    }
+	  if (size == 0)
+	    {
+	      VDBG (0, "VCL<%d>: parse error '%s %s', using default "
+		    "heapsize %lld (0x%llx)", getpid (), argv[i], argv[i + 1],
+		    vcl_cfg->heapsize, vcl_cfg->heapsize);
+	      goto defaulted;
+	    }
+
+	  if (*sizep == 'g' || *sizep == 'G')
+	    vcl_cfg->heapsize = size << 30;
+	  else if (*sizep == 'm' || *sizep == 'M')
+	    vcl_cfg->heapsize = size << 20;
+	  else
+	    {
+	      VDBG (0, "VCL<%d>: parse error '%s %s', using default "
+		    "heapsize %lld (0x%llx)", getpid (), argv[i], argv[i + 1],
+		    vcl_cfg->heapsize, vcl_cfg->heapsize);
+	      goto defaulted;
+	    }
+	}
+    }
+
+defaulted:
+  if (fp != NULL)
+    fclose (fp);
+  if (argv != NULL)
+    free (argv);
+
+  vcl_mem = mmap (0, vcl_cfg->heapsize, PROT_READ | PROT_WRITE,
+		  MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+  if (vcl_mem == MAP_FAILED)
+    {
+      clib_unix_error ("VCL<%d>: ERROR: mmap(0, %lld == 0x%llx, "
+		       "PROT_READ | PROT_WRITE,MAP_SHARED | MAP_ANONYMOUS, "
+		       "-1, 0) failed!",
+		       getpid (), vcl_cfg->heapsize, vcl_cfg->heapsize);
+      ASSERT (vcl_mem != MAP_FAILED);
+      return;
+    }
+  heap = clib_mem_init (vcl_mem, vcl_cfg->heapsize);
+  if (!heap)
+    {
+      clib_warning ("VCL<%d>: ERROR: clib_mem_init() failed!", getpid ());
+      ASSERT (heap);
+      return;
+    }
+  vcl_mem = clib_mem_alloc (sizeof (_vppcom_main));
+  if (!vcl_mem)
+    {
+      clib_warning ("VCL<%d>: ERROR: clib_mem_alloc() failed!", getpid ());
+      ASSERT (vcl_mem);
+      return;
+    }
+
+  clib_memcpy (vcl_mem, &_vppcom_main, sizeof (_vppcom_main));
+  vcm = vcl_mem;
+
+  VDBG (0, "VCL<%d>: allocated VCL heap = %p, size %lld (0x%llx)", getpid (),
+	heap, vcl_cfg->heapsize, vcl_cfg->heapsize);
+}
+
+void
+vppcom_cfg_read_file (char *conf_fname)
+{
+  vppcom_cfg_t *vcl_cfg = &vcm->cfg;
+  int fd;
+  unformat_input_t _input, *input = &_input;
+  unformat_input_t _line_input, *line_input = &_line_input;
+  u8 vc_cfg_input = 0;
+  u8 *chroot_path;
+  struct stat s;
+  u32 uid, gid, q_len;
+
+  fd = open (conf_fname, O_RDONLY);
+  if (fd < 0)
+    {
+      VDBG (0, "VCL<%d>: using default configuration.", getpid (),
+	    conf_fname);
+      goto file_done;
+    }
+
+  if (fstat (fd, &s) < 0)
+    {
+      VDBG (0, "VCL<%d>: failed to stat `%s', using default configuration",
+	    getpid (), conf_fname);
+      goto file_done;
+    }
+
+  if (!(S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
+    {
+      VDBG (0, "VCL<%d>: not a regular file `%s', using default "
+	    "configuration", getpid (), conf_fname);
+      goto file_done;
+    }
+
+  unformat_init_clib_file (input, fd);
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      (void) unformat_user (input, unformat_line_input, line_input);
+      unformat_skip_white_space (line_input);
+
+      if (unformat (line_input, "vcl {"))
+	{
+	  vc_cfg_input = 1;
+	  continue;
+	}
+
+      if (vc_cfg_input)
+	{
+	  if (unformat (line_input, "heapsize %s", &chroot_path))
+	    {
+	      vec_terminate_c_string (chroot_path);
+	      VDBG (0, "VCL<%d>: configured heapsize %s, actual heapsize %lld"
+		    " (0x%llx)", getpid (), chroot_path, vcl_cfg->heapsize,
+		    vcl_cfg->heapsize);
+	      vec_free (chroot_path);
+	    }
+	  else if (unformat (line_input, "api-prefix %s", &chroot_path))
+	    {
+	      vec_terminate_c_string (chroot_path);
+	      if (vcl_cfg->vpp_api_filename)
+		vec_free (vcl_cfg->vpp_api_filename);
+	      vcl_cfg->vpp_api_filename = format (0, "/%s-vpe-api%c",
+						  chroot_path, 0);
+	      vl_set_memory_root_path ((char *) chroot_path);
+
+	      VDBG (0, "VCL<%d>: configured api-prefix (%s) and api filename"
+		    " (%s)", getpid (), chroot_path,
+		    vcl_cfg->vpp_api_filename);
+	      chroot_path = 0;	/* Don't vec_free() it! */
+	    }
+	  else if (unformat (line_input, "vpp-api-q-length %d", &q_len))
+	    {
+	      if (q_len < vcl_cfg->vpp_api_q_length)
+		{
+		  clib_warning ("VCL<%d>: ERROR: configured vpp-api-q-length "
+				"(%u) is too small! Using default: %u ",
+				getpid (), q_len, vcl_cfg->vpp_api_q_length);
+		}
+	      else
+		{
+		  vcl_cfg->vpp_api_q_length = q_len;
+
+		  VDBG (0, "VCL<%d>: configured vpp-api-q-length %u",
+			getpid (), vcl_cfg->vpp_api_q_length);
+		}
+	    }
+	  else if (unformat (line_input, "uid %d", &uid))
+	    {
+	      vl_set_memory_uid (uid);
+	      VDBG (0, "VCL<%d>: configured uid %d", getpid (), uid);
+	    }
+	  else if (unformat (line_input, "gid %d", &gid))
+	    {
+	      vl_set_memory_gid (gid);
+	      VDBG (0, "VCL<%d>: configured gid %d", getpid (), gid);
+	    }
+	  else if (unformat (line_input, "segment-baseva 0x%lx",
+			     &vcl_cfg->segment_baseva))
+	    {
+	      VDBG (0, "VCL<%d>: configured segment_baseva 0x%lx", getpid (),
+		    vcl_cfg->segment_baseva);
+	    }
+	  else if (unformat (line_input, "segment-size 0x%lx",
+			     &vcl_cfg->segment_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured segment_size 0x%lx (%ld)",
+		    getpid (), vcl_cfg->segment_size, vcl_cfg->segment_size);
+	    }
+	  else if (unformat (line_input, "segment-size %ld",
+			     &vcl_cfg->segment_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured segment_size %ld (0x%lx)",
+		    getpid (), vcl_cfg->segment_size, vcl_cfg->segment_size);
+	    }
+	  else if (unformat (line_input, "add-segment-size 0x%lx",
+			     &vcl_cfg->add_segment_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured add_segment_size 0x%lx (%ld)",
+		    getpid (), vcl_cfg->add_segment_size,
+		    vcl_cfg->add_segment_size);
+	    }
+	  else if (unformat (line_input, "add-segment-size %ld",
+			     &vcl_cfg->add_segment_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured add_segment_size %ld (0x%lx)",
+		    getpid (), vcl_cfg->add_segment_size,
+		    vcl_cfg->add_segment_size);
+	    }
+	  else if (unformat (line_input, "preallocated-fifo-pairs %d",
+			     &vcl_cfg->preallocated_fifo_pairs))
+	    {
+	      VDBG (0, "VCL<%d>: configured preallocated_fifo_pairs %d "
+		    "(0x%x)", getpid (), vcl_cfg->preallocated_fifo_pairs,
+		    vcl_cfg->preallocated_fifo_pairs);
+	    }
+	  else if (unformat (line_input, "rx-fifo-size 0x%lx",
+			     &vcl_cfg->rx_fifo_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured rx_fifo_size 0x%lx (%ld)",
+		    getpid (), vcl_cfg->rx_fifo_size, vcl_cfg->rx_fifo_size);
+	    }
+	  else if (unformat (line_input, "rx-fifo-size %ld",
+			     &vcl_cfg->rx_fifo_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured rx_fifo_size %ld (0x%lx)",
+		    getpid (), vcl_cfg->rx_fifo_size, vcl_cfg->rx_fifo_size);
+	    }
+	  else if (unformat (line_input, "tx-fifo-size 0x%lx",
+			     &vcl_cfg->tx_fifo_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured tx_fifo_size 0x%lx (%ld)",
+		    getpid (), vcl_cfg->tx_fifo_size, vcl_cfg->tx_fifo_size);
+	    }
+	  else if (unformat (line_input, "tx-fifo-size %ld",
+			     &vcl_cfg->tx_fifo_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured tx_fifo_size %ld (0x%lx)",
+		    getpid (), vcl_cfg->tx_fifo_size, vcl_cfg->tx_fifo_size);
+	    }
+	  else if (unformat (line_input, "event-queue-size 0x%lx",
+			     &vcl_cfg->event_queue_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured event_queue_size 0x%lx (%ld)",
+		    getpid (), vcl_cfg->event_queue_size,
+		    vcl_cfg->event_queue_size);
+	    }
+	  else if (unformat (line_input, "event-queue-size %ld",
+			     &vcl_cfg->event_queue_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured event_queue_size %ld (0x%lx)",
+		    getpid (), vcl_cfg->event_queue_size,
+		    vcl_cfg->event_queue_size);
+	    }
+	  else if (unformat (line_input, "listen-queue-size 0x%lx",
+			     &vcl_cfg->listen_queue_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured listen_queue_size 0x%lx (%ld)",
+		    getpid (), vcl_cfg->listen_queue_size,
+		    vcl_cfg->listen_queue_size);
+	    }
+	  else if (unformat (line_input, "listen-queue-size %ld",
+			     &vcl_cfg->listen_queue_size))
+	    {
+	      VDBG (0, "VCL<%d>: configured listen_queue_size %ld (0x%lx)",
+		    getpid (), vcl_cfg->listen_queue_size,
+		    vcl_cfg->listen_queue_size);
+	    }
+	  else if (unformat (line_input, "app-timeout %f",
+			     &vcl_cfg->app_timeout))
+	    {
+	      VDBG (0, "VCL<%d>: configured app_timeout %f",
+		    getpid (), vcl_cfg->app_timeout);
+	    }
+	  else if (unformat (line_input, "session-timeout %f",
+			     &vcl_cfg->session_timeout))
+	    {
+	      VDBG (0, "VCL<%d>: configured session_timeout %f",
+		    getpid (), vcl_cfg->session_timeout);
+	    }
+	  else if (unformat (line_input, "accept-timeout %f",
+			     &vcl_cfg->accept_timeout))
+	    {
+	      VDBG (0, "VCL<%d>: configured accept_timeout %f",
+		    getpid (), vcl_cfg->accept_timeout);
+	    }
+	  else if (unformat (line_input, "app-proxy-transport-tcp"))
+	    {
+	      vcl_cfg->app_proxy_transport_tcp = 1;
+	      VDBG (0, "VCL<%d>: configured app_proxy_transport_tcp (%d)",
+		    getpid (), vcl_cfg->app_proxy_transport_tcp);
+	    }
+	  else if (unformat (line_input, "app-proxy-transport-udp"))
+	    {
+	      vcl_cfg->app_proxy_transport_udp = 1;
+	      VDBG (0, "VCL<%d>: configured app_proxy_transport_udp (%d)",
+		    getpid (), vcl_cfg->app_proxy_transport_udp);
+	    }
+	  else if (unformat (line_input, "app-scope-local"))
+	    {
+	      vcl_cfg->app_scope_local = 1;
+	      VDBG (0, "VCL<%d>: configured app_scope_local (%d)",
+		    getpid (), vcl_cfg->app_scope_local);
+	    }
+	  else if (unformat (line_input, "app-scope-global"))
+	    {
+	      vcl_cfg->app_scope_global = 1;
+	      VDBG (0, "VCL<%d>: configured app_scope_global (%d)",
+		    getpid (), vcl_cfg->app_scope_global);
+	    }
+	  else if (unformat (line_input, "namespace-secret %lu",
+			     &vcl_cfg->namespace_secret))
+	    {
+	      VDBG (0, "VCL<%d>: configured namespace_secret %lu (0x%lx)",
+		    getpid (), vcl_cfg->namespace_secret,
+		    vcl_cfg->namespace_secret);
+	    }
+	  else if (unformat (line_input, "namespace-id %v",
+			     &vcl_cfg->namespace_id))
+	    {
+	      u32 max_nsid_vec_len = vcl_max_nsid_len ();
+	      u32 nsid_vec_len = vec_len (vcl_cfg->namespace_id);
+	      if (nsid_vec_len > max_nsid_vec_len)
+		{
+		  _vec_len (vcl_cfg->namespace_id) = max_nsid_vec_len;
+		  VDBG (0, "VCL<%d>: configured namespace_id is too long,"
+			" truncated to %d characters!",
+			getpid (), max_nsid_vec_len);
+		}
+
+	      VDBG (0, "VCL<%d>: configured namespace_id %v",
+		    getpid (), vcl_cfg->namespace_id);
+	    }
+	  else if (unformat (line_input, "}"))
+	    {
+	      vc_cfg_input = 0;
+	      VDBG (0, "VCL<%d>: completed parsing vppcom config!",
+		    getpid ());
+	      goto input_done;
+	    }
+	  else
+	    {
+	      if (line_input->buffer[line_input->index] != '#')
+		{
+		  clib_warning ("VCL<%d>: Unknown vppcom config option: '%s'",
+				getpid (), (char *)
+				&line_input->buffer[line_input->index]);
+		}
+	    }
+	}
+    }
+
+input_done:
+  unformat_free (input);
+
+file_done:
+  if (fd >= 0)
+    close (fd);
+}
+
+void
+vppcom_cfg (vppcom_cfg_t * vcl_cfg)
+{
+  char *conf_fname, *env_var_str;
+
+  vppcom_cfg_init (vcl_cfg);
+  env_var_str = getenv (VPPCOM_ENV_DEBUG);
+  if (env_var_str)
+    {
+      u32 tmp;
+      if (sscanf (env_var_str, "%u", &tmp) != 1)
+	clib_warning ("VCL<%d>: WARNING: Invalid debug level specified "
+		      "in the environment variable " VPPCOM_ENV_DEBUG
+		      " (%s)!\n", getpid (), env_var_str);
+      else
+	{
+	  vcm->debug = tmp;
+	  VDBG (0, "VCL<%d>: configured VCL debug level (%u) from "
+		VPPCOM_ENV_DEBUG "!", getpid (), vcm->debug);
+	}
+    }
+  conf_fname = getenv (VPPCOM_ENV_CONF);
+  if (!conf_fname)
+    conf_fname = VPPCOM_CONF_DEFAULT;
+  vppcom_cfg_heapsize (conf_fname);
+  vppcom_cfg_read_file (conf_fname);
+
+  env_var_str = getenv (VPPCOM_ENV_API_PREFIX);
+  if (env_var_str)
+    {
+      if (vcl_cfg->vpp_api_filename)
+	vec_free (vcl_cfg->vpp_api_filename);
+      vcl_cfg->vpp_api_filename = format (0, "/%s-vpe-api%c", env_var_str, 0);
+      vl_set_memory_root_path ((char *) env_var_str);
+
+      VDBG (0, "VCL<%d>: configured api prefix (%s) and filename (%s) "
+	    "from " VPPCOM_ENV_API_PREFIX "!",
+	    getpid (), env_var_str, vcl_cfg->vpp_api_filename);
+    }
+  env_var_str = getenv (VPPCOM_ENV_APP_NAMESPACE_ID);
+  if (env_var_str)
+    {
+      u32 ns_id_vec_len = strlen (env_var_str);
+
+      vec_reset_length (vcm->cfg.namespace_id);
+      vec_validate (vcm->cfg.namespace_id, ns_id_vec_len - 1);
+      clib_memcpy (vcm->cfg.namespace_id, env_var_str, ns_id_vec_len);
+
+      VDBG (0, "VCL<%d>: configured namespace_id (%v) from "
+	    VPPCOM_ENV_APP_NAMESPACE_ID "!", getpid (),
+	    vcm->cfg.namespace_id);
+    }
+  env_var_str = getenv (VPPCOM_ENV_APP_NAMESPACE_SECRET);
+  if (env_var_str)
+    {
+      u64 tmp;
+      if (sscanf (env_var_str, "%lu", &tmp) != 1)
+	clib_warning ("VCL<%d>: WARNING: Invalid namespace secret "
+		      "specified in the environment variable "
+		      VPPCOM_ENV_APP_NAMESPACE_SECRET
+		      " (%s)!\n", getpid (), env_var_str);
+      else
+	{
+	  vcm->cfg.namespace_secret = tmp;
+	  VDBG (0, "VCL<%d>: configured namespace secret (%lu) from "
+		VPPCOM_ENV_APP_NAMESPACE_SECRET "!", getpid (),
+		vcm->cfg.namespace_secret);
+	}
+    }
+  if (getenv (VPPCOM_ENV_APP_PROXY_TRANSPORT_TCP))
+    {
+      vcm->cfg.app_proxy_transport_tcp = 1;
+      VDBG (0, "VCL<%d>: configured app_proxy_transport_tcp (%u) from "
+	    VPPCOM_ENV_APP_PROXY_TRANSPORT_TCP "!", getpid (),
+	    vcm->cfg.app_proxy_transport_tcp);
+    }
+  if (getenv (VPPCOM_ENV_APP_PROXY_TRANSPORT_UDP))
+    {
+      vcm->cfg.app_proxy_transport_udp = 1;
+      VDBG (0, "VCL<%d>: configured app_proxy_transport_udp (%u) from "
+	    VPPCOM_ENV_APP_PROXY_TRANSPORT_UDP "!", getpid (),
+	    vcm->cfg.app_proxy_transport_udp);
+    }
+  if (getenv (VPPCOM_ENV_APP_SCOPE_LOCAL))
+    {
+      vcm->cfg.app_scope_local = 1;
+      VDBG (0, "VCL<%d>: configured app_scope_local (%u) from "
+	    VPPCOM_ENV_APP_SCOPE_LOCAL "!", getpid (),
+	    vcm->cfg.app_scope_local);
+    }
+  if (getenv (VPPCOM_ENV_APP_SCOPE_GLOBAL))
+    {
+      vcm->cfg.app_scope_global = 1;
+      VDBG (0, "VCL<%d>: configured app_scope_global (%u) from "
+	    VPPCOM_ENV_APP_SCOPE_GLOBAL "!", getpid (),
+	    vcm->cfg.app_scope_global);
+    }
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vcl/vcl_event.c b/src/vcl/vcl_event.c
index e72b864e944..e08f5f33adc 100644
--- a/src/vcl/vcl_event.c
+++ b/src/vcl/vcl_event.c
@@ -20,6 +20,7 @@
 
 #include <vcl/vppcom.h>
 #include <vcl/vcl_event.h>
+#include <vcl/vcl_private.h>
 
 /**
  * @file
@@ -29,7 +30,7 @@
  */
 
 int
-vce_generate_event (vce_event_thread_t *evt, u32 ev_idx)
+vce_generate_event (vce_event_thread_t * evt, u32 ev_idx)
 {
   int elts, rv = 0;
   vce_event_t *p;
@@ -38,9 +39,9 @@ vce_generate_event (vce_event_thread_t *evt, u32 ev_idx)
 
   /* Check there is event data for this event */
 
-  VCE_EVENTS_LOCK();
-  p =  pool_elt_at_index (evt->vce_events, ev_idx);
-  ASSERT(p);
+  VCE_EVENTS_LOCK ();
+  p = pool_elt_at_index (evt->vce_events, ev_idx);
+  ASSERT (p);
 
   elts = (int) clib_fifo_free_elts (evt->event_index_fifo);
   if (PREDICT_TRUE (elts))
@@ -61,7 +62,7 @@ vce_generate_event (vce_event_thread_t *evt, u32 ev_idx)
 }
 
 void
-vce_clear_event (vce_event_thread_t *evt, u32 ev_idx)
+vce_clear_event (vce_event_thread_t * evt, u32 ev_idx)
 {
   VCE_EVENTS_LOCK ();
   pool_put_index (evt->vce_events, ev_idx);
@@ -69,19 +70,19 @@ vce_clear_event (vce_event_thread_t *evt, u32 ev_idx)
 }
 
 vce_event_t *
-vce_get_event_from_index(vce_event_thread_t *evt, u32 ev_idx)
+vce_get_event_from_index (vce_event_thread_t * evt, u32 ev_idx)
 {
   vce_event_t *ev = 0;
   /* Assumes caller has obtained the spinlock (evt->events_lockp) */
 
-  if ( ! pool_is_free_index (evt->vce_events, ev_idx))
+  if (!pool_is_free_index (evt->vce_events, ev_idx))
     ev = pool_elt_at_index (evt->vce_events, ev_idx);
 
   return ev;
 }
 
 vce_event_handler_reg_t *
-vce_get_event_handler (vce_event_thread_t *evt, vce_event_key_t *evk)
+vce_get_event_handler (vce_event_thread_t * evt, vce_event_key_t * evk)
 {
   vce_event_handler_reg_t *handler = 0;
   uword *p;
@@ -96,8 +97,8 @@ vce_get_event_handler (vce_event_thread_t *evt, vce_event_key_t *evk)
 }
 
 vce_event_handler_reg_t *
-vce_register_handler (vce_event_thread_t *evt, vce_event_key_t *evk,
-                      vce_event_callback_t cb, void *cb_args)
+vce_register_handler (vce_event_thread_t * evt, vce_event_key_t * evk,
+		      vce_event_callback_t cb, void *cb_args)
 {
   vce_event_handler_reg_t *handler;
   vce_event_handler_reg_t *old_handler = 0;
@@ -116,17 +117,17 @@ vce_register_handler (vce_event_thread_t *evt, vce_event_key_t *evk,
       /* If we are just re-registering, ignore and move on
        * else store the old handler_fn for unregister to re-instate */
       if (old_handler->handler_fn == cb)
-        {
+	{
 
-          VCE_HANDLERS_UNLOCK ();
+	  VCE_HANDLERS_UNLOCK ();
 
-          /* Signal event thread that a handler exists in case any
-           * recycled events requiring this handler are pending */
-          pthread_mutex_lock (&(evt->generator_lock));
-          pthread_cond_signal (&(evt->generator_cond));
-          pthread_mutex_unlock (&(evt->generator_lock));
-          return old_handler;
-        }
+	  /* Signal event thread that a handler exists in case any
+	   * recycled events requiring this handler are pending */
+	  pthread_mutex_lock (&(evt->generator_lock));
+	  pthread_cond_signal (&(evt->generator_cond));
+	  pthread_mutex_unlock (&(evt->generator_lock));
+	  return old_handler;
+	}
     }
 
   pool_get (evt->vce_event_handlers, handler);
@@ -134,7 +135,7 @@ vce_register_handler (vce_event_thread_t *evt, vce_event_key_t *evk,
 
   handler->handler_fn = cb;
   handler->replaced_handler_idx = (u32) ((p) ? p[0] : ~0);
-  handler->ev_idx = (u32) ~0; //This will be set by the event thread if event happens
+  handler->ev_idx = (u32) ~ 0;	//This will be set by the event thread if event happens
   handler->evk = evk->as_u64;
   handler->handler_fn_args = cb_args;
 
@@ -155,8 +156,8 @@ vce_register_handler (vce_event_thread_t *evt, vce_event_key_t *evk,
 }
 
 int
-vce_unregister_handler (vce_event_thread_t *evt,
-			vce_event_handler_reg_t *handler)
+vce_unregister_handler (vce_event_thread_t * evt,
+			vce_event_handler_reg_t * handler)
 {
   uword *p;
   u64 evk = handler->evk;
@@ -218,54 +219,54 @@ vce_event_thread_fn (void *arg)
     {
       uword fifo_depth = clib_fifo_elts (evt->event_index_fifo);
       while ((fifo_depth == 0) || (recycle_count == fifo_depth))
-        {
-          recycle_count = 0;
-          pthread_cond_wait (&(evt->generator_cond), &(evt->generator_lock));
-          fifo_depth = clib_fifo_elts (evt->event_index_fifo);
-        }
+	{
+	  recycle_count = 0;
+	  pthread_cond_wait (&(evt->generator_cond), &(evt->generator_lock));
+	  fifo_depth = clib_fifo_elts (evt->event_index_fifo);
+	}
 
       /* Remove event */
       VCE_EVENTS_LOCK ();
       clib_fifo_sub1 (evt->event_index_fifo, ev_idx);
       ev = vce_get_event_from_index (evt, ev_idx);
-      ASSERT(ev);
+      ASSERT (ev);
       if (recycle_count && ev->recycle)
-        {
-          clib_fifo_add1 (evt->event_index_fifo, ev_idx);
-          VCE_EVENTS_UNLOCK ();
-          continue;
-        }
+	{
+	  clib_fifo_add1 (evt->event_index_fifo, ev_idx);
+	  VCE_EVENTS_UNLOCK ();
+	  continue;
+	}
       VCE_HANDLERS_LOCK ();
 
       p = hash_get (evt->handlers_index_by_event_key, ev->evk.as_u64);
       if (!p)
-        {
-          /* If an event falls in the woods, and there is no handler to hear it,
-           * does it make any sound?
-           * I don't know either, so lets biff the event */
-          pool_put(evt->vce_events, ev);
-          VCE_EVENTS_UNLOCK ();
-          VCE_HANDLERS_UNLOCK ();
-          pthread_mutex_unlock (&(evt->generator_lock));
-        }
+	{
+	  /* If an event falls in the woods, and there is no handler to hear it,
+	   * does it make any sound?
+	   * I don't know either, so lets biff the event */
+	  pool_put (evt->vce_events, ev);
+	  VCE_EVENTS_UNLOCK ();
+	  VCE_HANDLERS_UNLOCK ();
+	  pthread_mutex_unlock (&(evt->generator_lock));
+	}
       else
-        {
-          u32 evt_recycle = ev->recycle;
-          handler = pool_elt_at_index (evt->vce_event_handlers, p[0]);
-          handler->ev_idx = ev_idx;
-          ev->recycle = 0;
+	{
+	  u32 evt_recycle = ev->recycle;
+	  handler = pool_elt_at_index (evt->vce_event_handlers, p[0]);
+	  handler->ev_idx = ev_idx;
+	  ev->recycle = 0;
 
-          VCE_EVENTS_UNLOCK ();
-          VCE_HANDLERS_UNLOCK ();
-          pthread_mutex_unlock (&(evt->generator_lock));
+	  VCE_EVENTS_UNLOCK ();
+	  VCE_HANDLERS_UNLOCK ();
+	  pthread_mutex_unlock (&(evt->generator_lock));
 
-          (handler->handler_fn)(handler);
+	  (handler->handler_fn) (handler);
 
-          VCE_EVENTS_LOCK ();
-          ev = vce_get_event_from_index (evt, ev_idx);
-          recycle_count += (!evt_recycle && ev && ev->recycle) ? 1 : 0;
-          VCE_EVENTS_UNLOCK ();
-        }
+	  VCE_EVENTS_LOCK ();
+	  ev = vce_get_event_from_index (evt, ev_idx);
+	  recycle_count += (!evt_recycle && ev && ev->recycle) ? 1 : 0;
+	  VCE_EVENTS_UNLOCK ();
+	}
 
       pthread_mutex_lock (&(evt->generator_lock));
     }
@@ -273,7 +274,7 @@ vce_event_thread_fn (void *arg)
 }
 
 int
-vce_start_event_thread (vce_event_thread_t *evt, u8 max_events)
+vce_start_event_thread (vce_event_thread_t * evt, u8 max_events)
 {
   clib_fifo_validate (evt->event_index_fifo, max_events);
   evt->handlers_index_by_event_key = hash_create (0, sizeof (uword));
@@ -285,6 +286,269 @@ vce_start_event_thread (vce_event_thread_t *evt, u8 max_events)
   clib_spinlock_init (&(evt->handlers_lockp));
 
   return pthread_create (&(evt->thread), NULL /* attr */ ,
-                         vce_event_thread_fn, evt);
+			 vce_event_thread_fn, evt);
+}
+
+static void *
+vppcom_session_io_thread_fn (void *arg)
+{
+  vppcom_session_io_thread_t *evt = (vppcom_session_io_thread_t *) arg;
+  u32 *session_indexes = 0, *session_index;
+  int i, rv;
+  u32 bytes = 0;
+  vcl_session_t *session;
+
+  while (1)
+    {
+      vec_reset_length (session_indexes);
+      VCE_IO_SESSIONS_LOCK ();
+      /* *INDENT-OFF* */
+      pool_foreach (session_index, evt->active_session_indexes, ({
+	vec_add1 (session_indexes, *session_index);
+      }));
+      /* *INDENT-ON* */
+      VCE_IO_SESSIONS_UNLOCK ();
+      if (session_indexes)
+	{
+	  for (i = 0; i < vec_len (session_indexes); ++i)
+	    {
+	      VCL_SESSION_LOCK_AND_GET (session_indexes[i], &session);
+	      bytes = svm_fifo_max_dequeue (session->rx_fifo);
+	      VCL_SESSION_UNLOCK ();
+
+	      if (bytes)
+		{
+		  vppcom_ioevent_t *eio;
+		  vce_event_t *ev;
+		  u32 ev_idx;
+
+		  VCL_EVENTS_LOCK ();
+
+		  pool_get (vcm->event_thread.vce_events, ev);
+		  ev_idx = (u32) (ev - vcm->event_thread.vce_events);
+		  eio = vce_get_event_data (ev, sizeof (*eio));
+		  ev->evk.eid = VCL_EVENT_IOEVENT_RX_FIFO;
+		  ev->evk.session_index = session_indexes[i];
+		  eio->bytes = bytes;
+		  eio->session_index = session_indexes[i];
+
+		  VCL_EVENTS_UNLOCK ();
+
+		  rv = vce_generate_event (&vcm->event_thread, ev_idx);
+		}
+	    }
+	}
+      struct timespec ts;
+      ts.tv_sec = 0;
+      ts.tv_nsec = 1000000;	/* 1 millisecond */
+      nanosleep (&ts, NULL);
+    }
+done:
+  VCL_SESSION_UNLOCK ();
+  return NULL;
 }
 
+static int
+vppcom_start_io_event_thread (vppcom_session_io_thread_t * evt,
+			      u8 max_sessions)
+{
+  pthread_cond_init (&(evt->vce_io_cond), NULL);
+  pthread_mutex_init (&(evt->vce_io_lock), NULL);
+
+  clib_spinlock_init (&(evt->io_sessions_lockp));
+
+  return pthread_create (&(evt->thread), NULL /* attr */ ,
+			 vppcom_session_io_thread_fn, evt);
+}
+
+static void
+vce_registered_ioevent_handler_fn (void *arg)
+{
+  vce_event_handler_reg_t *reg = (vce_event_handler_reg_t *) arg;
+  vppcom_ioevent_t *eio;
+  vce_event_t *ev;
+  u32 ioevt_ndx = (u64) (reg->handler_fn_args);
+  vppcom_session_ioevent_t *ioevent, ioevent_;
+
+  VCL_EVENTS_LOCK ();
+  ev = vce_get_event_from_index (&vcm->event_thread, reg->ev_idx);
+  eio = vce_get_event_data (ev, sizeof (*eio));
+  VCL_EVENTS_UNLOCK ();
+
+  VCL_IO_SESSIONS_LOCK ();
+  ioevent = pool_elt_at_index (vcm->session_io_thread.ioevents, ioevt_ndx);
+  ioevent_ = *ioevent;
+  VCL_IO_SESSIONS_UNLOCK ();
+  (ioevent_.user_cb) (eio, ioevent_.user_cb_data);
+  vce_clear_event (&vcm->event_thread, reg->ev_idx);
+  return;
+
+  /*TODO - Unregister check in close for this listener */
+
+}
+
+void
+vce_registered_listener_connect_handler_fn (void *arg)
+{
+  vce_event_handler_reg_t *reg = (vce_event_handler_reg_t *) arg;
+  vce_event_connect_request_t *ecr;
+  vce_event_t *ev;
+  vppcom_endpt_t ep;
+
+  vcl_session_t *new_session;
+  int rv;
+
+  vppcom_session_listener_t *session_listener =
+    (vppcom_session_listener_t *) reg->handler_fn_args;
+
+  VCL_EVENTS_LOCK ();
+  ev = vce_get_event_from_index (&vcm->event_thread, reg->ev_idx);
+  ecr = vce_get_event_data (ev, sizeof (*ecr));
+  VCL_EVENTS_UNLOCK ();
+  VCL_SESSION_LOCK_AND_GET (ecr->accepted_session_index, &new_session);
+
+  ep.is_ip4 = new_session->transport.is_ip4;
+  ep.port = new_session->transport.rmt_port;
+  if (new_session->transport.is_ip4)
+    clib_memcpy (&ep.ip, &new_session->transport.rmt_ip.ip4,
+		 sizeof (ip4_address_t));
+  else
+    clib_memcpy (&ep.ip, &new_session->transport.rmt_ip.ip6,
+		 sizeof (ip6_address_t));
+
+  vppcom_send_accept_session_reply (new_session->vpp_handle,
+				    new_session->client_context,
+				    0 /* retval OK */ );
+  VCL_SESSION_UNLOCK ();
+
+  (session_listener->user_cb) (ecr->accepted_session_index, &ep,
+			       session_listener->user_cb_data);
+
+  if (vcm->session_io_thread.io_sessions_lockp)
+    {
+      /* Throw this new accepted session index into the rx poll thread pool */
+      VCL_IO_SESSIONS_LOCK ();
+      u32 *active_session_index;
+      pool_get (vcm->session_io_thread.active_session_indexes,
+		active_session_index);
+      *active_session_index = ecr->accepted_session_index;
+      VCL_IO_SESSIONS_UNLOCK ();
+    }
+
+  /*TODO - Unregister check in close for this listener */
+  return;
+
+done:
+  ASSERT (0);			// If we can't get a lock or accepted session fails, lets blow up.
+}
+
+/**
+ * @brief vce_poll_wait_connect_request_handler_fn
+ * - used by vppcom_epoll_xxxx() for listener sessions
+ * - when a vl_api_accept_session_t_handler() generates an event
+ *   this callback is alerted and sets the fields that vppcom_epoll_wait()
+ *   expects to see.
+ *
+ * @param arg - void* to be cast to vce_event_handler_reg_t*
+ */
+void
+vce_poll_wait_connect_request_handler_fn (void *arg)
+{
+  vce_event_handler_reg_t *reg = (vce_event_handler_reg_t *) arg;
+  vce_event_t *ev;
+  /* Retrieve the VCL_EVENT_CONNECT_REQ_ACCEPTED event */
+  ev = vce_get_event_from_index (&vcm->event_thread, reg->ev_idx);
+  vce_event_connect_request_t *ecr = vce_get_event_data (ev, sizeof (*ecr));
+
+  /* Add the accepted_session_index to the FIFO */
+  VCL_ACCEPT_FIFO_LOCK ();
+  clib_fifo_add1 (vcm->client_session_index_fifo,
+		  ecr->accepted_session_index);
+  VCL_ACCEPT_FIFO_UNLOCK ();
+
+  /* Recycling the event. */
+  VCL_EVENTS_LOCK ();
+  ev->recycle = 1;
+  clib_fifo_add1 (vcm->event_thread.event_index_fifo, reg->ev_idx);
+  VCL_EVENTS_UNLOCK ();
+}
+
+int
+vppcom_session_register_ioevent_cb (uint32_t session_index,
+				    vppcom_session_ioevent_cb cb,
+				    uint8_t rx, void *ptr)
+{
+  int rv = VPPCOM_OK;
+  vce_event_key_t evk;
+  vppcom_session_ioevent_t *ioevent;
+
+  if (!vcm->session_io_thread.io_sessions_lockp)
+    rv = vppcom_start_io_event_thread (&vcm->session_io_thread, 100);	/* DAW_TODO: ??? hard-coded value */
+
+  if (rv == VPPCOM_OK)
+    {
+      void *io_evt_ndx;
+
+      /* Register handler for ioevent on session_index */
+      VCL_IO_SESSIONS_LOCK ();
+      pool_get (vcm->session_io_thread.ioevents, ioevent);
+      io_evt_ndx = (void *) (ioevent - vcm->session_io_thread.ioevents);
+      ioevent->user_cb = cb;
+      ioevent->user_cb_data = ptr;
+      VCL_IO_SESSIONS_UNLOCK ();
+
+      evk.session_index = session_index;
+      evk.eid = rx ? VCL_EVENT_IOEVENT_RX_FIFO : VCL_EVENT_IOEVENT_TX_FIFO;
+
+      (void) vce_register_handler (&vcm->event_thread, &evk,
+				   vce_registered_ioevent_handler_fn,
+				   io_evt_ndx);
+    }
+  return rv;
+}
+
+int
+vppcom_session_register_listener (uint32_t session_index,
+				  vppcom_session_listener_cb cb,
+				  vppcom_session_listener_errcb
+				  errcb, uint8_t flags, int q_len, void *ptr)
+{
+  int rv = VPPCOM_OK;
+  vce_event_key_t evk;
+  vppcom_session_listener_t *listener_args;
+
+  if (!vcm->session_io_thread.io_sessions_lockp)
+    rv = vppcom_start_io_event_thread (&vcm->session_io_thread, 100);	/* DAW_TODO: ??? hard-coded value */
+  if (rv)
+    {
+      goto done;
+    }
+  rv = vppcom_session_listen (session_index, q_len);
+  if (rv)
+    {
+      goto done;
+    }
+
+  /* Register handler for connect_request event on listen_session_index */
+  listener_args = clib_mem_alloc (sizeof (vppcom_session_listener_t));	// DAW_TODO: Use a pool instead of thrashing the memory allocator!
+  listener_args->user_cb = cb;
+  listener_args->user_cb_data = ptr;
+  listener_args->user_errcb = errcb;
+
+  evk.session_index = session_index;
+  evk.eid = VCL_EVENT_CONNECT_REQ_ACCEPTED;
+  (void) vce_register_handler (&vcm->event_thread, &evk,
+			       vce_registered_listener_connect_handler_fn,
+			       listener_args);
+
+done:
+  return rv;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vcl/vcl_private.h b/src/vcl/vcl_private.h
new file mode 100644
index 00000000000..4283b6e1167
--- /dev/null
+++ b/src/vcl/vcl_private.h
@@ -0,0 +1,337 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SRC_VCL_VCL_PRIVATE_H_
+#define SRC_VCL_VCL_PRIVATE_H_
+
+#include <vnet/session/application_interface.h>
+#include <vcl/vppcom.h>
+#include <vcl/vcl_event.h>
+#include <vcl/vcl_debug.h>
+
+#if (CLIB_DEBUG > 0)
+/* Set VPPCOM_DEBUG_INIT 2 for connection debug,
+ *                       3 for read/write debug output
+ * or
+ *    export VCL_DEBUG=<#> to set dynamically.
+ */
+#define VPPCOM_DEBUG_INIT 1
+#else
+#define VPPCOM_DEBUG_INIT 0
+#endif
+
+#define VPPCOM_DEBUG vcm->debug
+
+/*
+ * VPPCOM Private definitions and functions.
+ */
+typedef enum
+{
+  STATE_APP_START,
+  STATE_APP_CONN_VPP,
+  STATE_APP_ENABLED,
+  STATE_APP_ATTACHED,
+} app_state_t;
+
+typedef enum
+{
+  STATE_START = 0x01,
+  STATE_CONNECT = 0x02,
+  STATE_LISTEN = 0x04,
+  STATE_ACCEPT = 0x08,
+  STATE_CLOSE_ON_EMPTY = 0x10,
+  STATE_DISCONNECT = 0x20,
+  STATE_FAILED = 0x40
+} session_state_t;
+
+#define SERVER_STATE_OPEN  (STATE_ACCEPT|STATE_CLOSE_ON_EMPTY)
+#define CLIENT_STATE_OPEN  (STATE_CONNECT|STATE_CLOSE_ON_EMPTY)
+
+typedef struct epoll_event vppcom_epoll_event_t;
+
+typedef struct
+{
+  u32 next_sid;
+  u32 prev_sid;
+  u32 vep_idx;
+  vppcom_epoll_event_t ev;
+#define VEP_DEFAULT_ET_MASK  (EPOLLIN|EPOLLOUT)
+#define VEP_UNSUPPORTED_EVENTS (EPOLLONESHOT|EPOLLEXCLUSIVE)
+  u32 et_mask;
+} vppcom_epoll_t;
+
+typedef struct
+{
+  u8 is_ip4;
+  ip46_address_t ip46;
+} vppcom_ip46_t;
+
+enum
+{
+  VCL_SESS_ATTR_SERVER,
+  VCL_SESS_ATTR_CUT_THRU,
+  VCL_SESS_ATTR_VEP,
+  VCL_SESS_ATTR_VEP_SESSION,
+  VCL_SESS_ATTR_LISTEN,		// SOL_SOCKET,SO_ACCEPTCONN
+  VCL_SESS_ATTR_NONBLOCK,	// fcntl,O_NONBLOCK
+  VCL_SESS_ATTR_REUSEADDR,	// SOL_SOCKET,SO_REUSEADDR
+  VCL_SESS_ATTR_REUSEPORT,	// SOL_SOCKET,SO_REUSEPORT
+  VCL_SESS_ATTR_BROADCAST,	// SOL_SOCKET,SO_BROADCAST
+  VCL_SESS_ATTR_V6ONLY,		// SOL_TCP,IPV6_V6ONLY
+  VCL_SESS_ATTR_KEEPALIVE,	// SOL_SOCKET,SO_KEEPALIVE
+  VCL_SESS_ATTR_TCP_NODELAY,	// SOL_TCP,TCP_NODELAY
+  VCL_SESS_ATTR_TCP_KEEPIDLE,	// SOL_TCP,TCP_KEEPIDLE
+  VCL_SESS_ATTR_TCP_KEEPINTVL,	// SOL_TCP,TCP_KEEPINTVL
+  VCL_SESS_ATTR_MAX
+} vppcom_session_attr_t;
+
+#define VCL_SESS_ATTR_SET(ATTR, VAL)            \
+do {                                            \
+  (ATTR) |= 1 << (VAL);                         \
+ } while (0)
+
+#define VCL_SESS_ATTR_CLR(ATTR, VAL)            \
+do {                                            \
+  (ATTR) &= ~(1 << (VAL));                      \
+ } while (0)
+
+#define VCL_SESS_ATTR_TEST(ATTR, VAL)           \
+  ((ATTR) & (1 << (VAL)) ? 1 : 0)
+
+typedef struct
+{
+#define _(type, name) type name;
+  foreach_app_session_field
+#undef _
+  u32 sndbuf_size;		// VPP-TBD: Hack until support setsockopt(SO_SNDBUF)
+  u32 rcvbuf_size;		// VPP-TBD: Hack until support setsockopt(SO_RCVBUF)
+  u32 user_mss;			// VPP-TBD: Hack until support setsockopt(TCP_MAXSEG)
+  u8 *segment_name;
+  u32 sm_seg_index;
+  u32 client_context;
+  u64 vpp_handle;
+
+  /* Socket configuration state */
+  u8 is_vep;
+  u8 is_vep_session;
+  u32 attr;
+  u32 wait_cont_idx;
+  vppcom_epoll_t vep;
+  int libc_epfd;
+  u64 client_queue_address;
+  u64 options[16];
+  vce_event_handler_reg_t *poll_reg;
+#if VCL_ELOG
+  elog_track_t elog_track;
+#endif
+} vcl_session_t;
+
+typedef struct vppcom_cfg_t_
+{
+  u64 heapsize;
+  u32 vpp_api_q_length;
+  u64 segment_baseva;
+  u32 segment_size;
+  u32 add_segment_size;
+  u32 preallocated_fifo_pairs;
+  u32 rx_fifo_size;
+  u32 tx_fifo_size;
+  u32 event_queue_size;
+  u32 listen_queue_size;
+  u8 app_proxy_transport_tcp;
+  u8 app_proxy_transport_udp;
+  u8 app_scope_local;
+  u8 app_scope_global;
+  u8 *namespace_id;
+  u64 namespace_secret;
+  f64 app_timeout;
+  f64 session_timeout;
+  f64 accept_timeout;
+  u32 event_ring_size;
+  char *event_log_path;
+  u8 *vpp_api_filename;
+} vppcom_cfg_t;
+
+void vppcom_cfg (vppcom_cfg_t * vcl_cfg);
+
+typedef struct vppcom_main_t_
+{
+  u8 init;
+  u32 debug;
+  int main_cpu;
+
+  /* FIFO for accepted connections - used in epoll/select */
+  clib_spinlock_t session_fifo_lockp;
+  u32 *client_session_index_fifo;
+
+  /* vpp input queue */
+  svm_queue_t *vl_input_queue;
+
+  /* API client handle */
+  u32 my_client_index;
+  /* Session pool */
+  clib_spinlock_t sessions_lockp;
+  vcl_session_t *sessions;
+
+  /* Hash table for disconnect processing */
+  uword *session_index_by_vpp_handles;
+
+  /* Select bitmaps */
+  clib_bitmap_t *rd_bitmap;
+  clib_bitmap_t *wr_bitmap;
+  clib_bitmap_t *ex_bitmap;
+
+  /* Our event queue */
+  svm_queue_t *app_event_queue;
+
+  /* unique segment name counter */
+  u32 unique_segment_index;
+
+  /* For deadman timers */
+  clib_time_t clib_time;
+
+  /* State of the connection, shared between msg RX thread and main thread */
+  volatile app_state_t app_state;
+
+  vppcom_cfg_t cfg;
+
+  /* Event thread */
+  vce_event_thread_t event_thread;
+
+  /* IO thread */
+  vppcom_session_io_thread_t session_io_thread;
+
+#ifdef VCL_ELOG
+  /* VPP Event-logger */
+  elog_main_t elog_main;
+  elog_track_t elog_track;
+#endif
+
+  /* VNET_API_ERROR_FOO -> "Foo" hash table */
+  uword *error_string_by_error_number;
+} vppcom_main_t;
+
+extern vppcom_main_t *vcm;
+
+#define VCL_SESSION_LOCK_AND_GET(I, S)                          \
+do {                                                            \
+  clib_spinlock_lock (&vcm->sessions_lockp);                    \
+  rv = vppcom_session_at_index (I, S);                          \
+  if (PREDICT_FALSE (rv))                                       \
+    {                                                           \
+      clib_spinlock_unlock (&vcm->sessions_lockp);              \
+      clib_warning ("VCL<%d>: ERROR: Invalid ##I (%u)!",        \
+                    getpid (), I);                              \
+      goto done;                                                \
+    }                                                           \
+} while (0)
+
+#define VCL_SESSION_LOCK() clib_spinlock_lock (&(vcm->sessions_lockp))
+#define VCL_SESSION_UNLOCK() clib_spinlock_unlock (&(vcm->sessions_lockp))
+
+#define VCL_IO_SESSIONS_LOCK() \
+  clib_spinlock_lock (&(vcm->session_io_thread.io_sessions_lockp))
+#define VCL_IO_SESSIONS_UNLOCK() \
+  clib_spinlock_unlock (&(vcm->session_io_thread.io_sessions_lockp))
+
+#define VCL_ACCEPT_FIFO_LOCK() clib_spinlock_lock (&(vcm->session_fifo_lockp))
+#define VCL_ACCEPT_FIFO_UNLOCK() \
+  clib_spinlock_unlock (&(vcm->session_fifo_lockp))
+
+#define VCL_EVENTS_LOCK() \
+  clib_spinlock_lock (&(vcm->event_thread.events_lockp))
+#define VCL_EVENTS_UNLOCK() \
+  clib_spinlock_unlock (&(vcm->event_thread.events_lockp))
+
+static inline int
+vppcom_session_at_index (u32 session_index, vcl_session_t * volatile *sess)
+{
+  /* Assumes that caller has acquired spinlock: vcm->sessions_lockp */
+  if (PREDICT_FALSE ((session_index == ~0) ||
+		     pool_is_free_index (vcm->sessions, session_index)))
+    {
+      clib_warning ("VCL<%d>: invalid session, sid (%u) has been closed!",
+		    getpid (), session_index);
+      return VPPCOM_EBADFD;
+    }
+  *sess = pool_elt_at_index (vcm->sessions, session_index);
+  return VPPCOM_OK;
+}
+
+static inline void
+vppcom_session_table_add_listener (u64 listener_handle, u32 value)
+{
+  /* Session and listener handles have different formats. The latter has
+   * the thread index in the upper 32 bits while the former has the session
+   * type. Knowing that, for listeners we just flip the MSB to 1 */
+  listener_handle |= 1ULL << 63;
+  hash_set (vcm->session_index_by_vpp_handles, listener_handle, value);
+}
+
+static inline vcl_session_t *
+vppcom_session_table_lookup_listener (u64 listener_handle)
+{
+  uword *p;
+  u64 handle = listener_handle | (1ULL << 63);
+  vcl_session_t *session;
+
+  p = hash_get (vcm->session_index_by_vpp_handles, handle);
+  if (!p)
+    {
+      clib_warning ("VCL<%d>: couldn't find listen session: unknown vpp "
+		    "listener handle %llx", getpid (), listener_handle);
+      return 0;
+    }
+  if (pool_is_free_index (vcm->sessions, p[0]))
+    {
+      VDBG (1, "VCL<%d>: invalid listen session, sid (%u)", getpid (), p[0]);
+      return 0;
+    }
+
+  session = pool_elt_at_index (vcm->sessions, p[0]);
+  ASSERT (session->session_state & STATE_LISTEN);
+  return session;
+}
+
+const char *vppcom_session_state_str (session_state_t state);
+
+/*
+ * VCL Binary API
+ */
+int vppcom_connect_to_vpp (char *app_name);
+void vppcom_init_error_string_table (void);
+void vppcom_send_session_enable_disable (u8 is_enable);
+void vppcom_app_send_attach (void);
+void vppcom_app_send_detach (void);
+void vppcom_send_connect_sock (vcl_session_t * session, u32 session_index);
+void vppcom_send_disconnect_session_reply (u64 vpp_handle, u32 session_index,
+					   int rv);
+void vppcom_send_disconnect_session (u64 vpp_handle, u32 session_index);
+void vppcom_send_bind_sock (vcl_session_t * session, u32 session_index);
+void vppcom_send_unbind_sock (u64 vpp_handle);
+void vppcom_api_hookup (void);
+void vppcom_send_accept_session_reply (u64 handle, u32 context, int retval);
+
+u32 vcl_max_nsid_len (void);
+
+#endif /* SRC_VCL_VCL_PRIVATE_H_ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 3cd2e766f63..1fd138e6dd3 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -15,273 +15,11 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <signal.h>
 #include <svm/svm_fifo_segment.h>
-#include <vlibmemory/api.h>
-#include <vpp/api/vpe_msg_enum.h>
-#include <vnet/session/application_interface.h>
 #include <vcl/vppcom.h>
 #include <vcl/vcl_event.h>
 #include <vcl/vcl_debug.h>
-#include <vlib/unix/unix.h>
-#include <vppinfra/vec_bootstrap.h>
-
-#define vl_typedefs		/* define message structures */
-#include <vpp/api/vpe_all_api_h.h>
-#undef vl_typedefs
-
-/* declare message handlers for each api */
-
-#define vl_endianfun		/* define message structures */
-#include <vpp/api/vpe_all_api_h.h>
-#undef vl_endianfun
-
-/* instantiate all the print functions we know about */
-#define vl_print(handle, ...)
-#define vl_printfun
-#include <vpp/api/vpe_all_api_h.h>
-#undef vl_printfun
-
-#if (CLIB_DEBUG > 0)
-/* Set VPPCOM_DEBUG_INIT 2 for connection debug,
- *                       3 for read/write debug output
- * or
- *    export VCL_DEBUG=<#> to set dynamically.
- */
-#define VPPCOM_DEBUG_INIT 1
-#else
-#define VPPCOM_DEBUG_INIT 0
-#endif
-
-#define VPPCOM_DEBUG vcm->debug
-
-/*
- * VPPCOM Private definitions and functions.
- */
-typedef enum
-{
-  STATE_APP_START,
-  STATE_APP_CONN_VPP,
-  STATE_APP_ENABLED,
-  STATE_APP_ATTACHED,
-} app_state_t;
-
-typedef enum
-{
-  STATE_START = 0x01,
-  STATE_CONNECT = 0x02,
-  STATE_LISTEN = 0x04,
-  STATE_ACCEPT = 0x08,
-  STATE_CLOSE_ON_EMPTY = 0x10,
-  STATE_DISCONNECT = 0x20,
-  STATE_FAILED = 0x40
-} session_state_t;
-
-#define SERVER_STATE_OPEN  (STATE_ACCEPT|STATE_CLOSE_ON_EMPTY)
-#define CLIENT_STATE_OPEN  (STATE_CONNECT|STATE_CLOSE_ON_EMPTY)
-
-typedef struct epoll_event vppcom_epoll_event_t;
-
-typedef struct
-{
-  u32 next_sid;
-  u32 prev_sid;
-  u32 vep_idx;
-  vppcom_epoll_event_t ev;
-#define VEP_DEFAULT_ET_MASK  (EPOLLIN|EPOLLOUT)
-#define VEP_UNSUPPORTED_EVENTS (EPOLLONESHOT|EPOLLEXCLUSIVE)
-  u32 et_mask;
-} vppcom_epoll_t;
-
-typedef struct
-{
-  u8 is_ip4;
-  ip46_address_t ip46;
-} vppcom_ip46_t;
-
-enum
-{
-  VCL_SESS_ATTR_SERVER,
-  VCL_SESS_ATTR_CUT_THRU,
-  VCL_SESS_ATTR_VEP,
-  VCL_SESS_ATTR_VEP_SESSION,
-  VCL_SESS_ATTR_LISTEN,		// SOL_SOCKET,SO_ACCEPTCONN
-  VCL_SESS_ATTR_NONBLOCK,	// fcntl,O_NONBLOCK
-  VCL_SESS_ATTR_REUSEADDR,	// SOL_SOCKET,SO_REUSEADDR
-  VCL_SESS_ATTR_REUSEPORT,	// SOL_SOCKET,SO_REUSEPORT
-  VCL_SESS_ATTR_BROADCAST,	// SOL_SOCKET,SO_BROADCAST
-  VCL_SESS_ATTR_V6ONLY,		// SOL_TCP,IPV6_V6ONLY
-  VCL_SESS_ATTR_KEEPALIVE,	// SOL_SOCKET,SO_KEEPALIVE
-  VCL_SESS_ATTR_TCP_NODELAY,	// SOL_TCP,TCP_NODELAY
-  VCL_SESS_ATTR_TCP_KEEPIDLE,	// SOL_TCP,TCP_KEEPIDLE
-  VCL_SESS_ATTR_TCP_KEEPINTVL,	// SOL_TCP,TCP_KEEPINTVL
-  VCL_SESS_ATTR_MAX
-} vppcom_session_attr_t;
-
-#define VCL_SESS_ATTR_SET(ATTR, VAL)            \
-do {                                            \
-  (ATTR) |= 1 << (VAL);                         \
- } while (0)
-
-#define VCL_SESS_ATTR_CLR(ATTR, VAL)            \
-do {                                            \
-  (ATTR) &= ~(1 << (VAL));                      \
- } while (0)
-
-#define VCL_SESS_ATTR_TEST(ATTR, VAL)           \
-  ((ATTR) & (1 << (VAL)) ? 1 : 0)
-
-typedef struct
-{
-#define _(type, name) type name;
-  foreach_app_session_field
-#undef _
-  u32 sndbuf_size;		// VPP-TBD: Hack until support setsockopt(SO_SNDBUF)
-  u32 rcvbuf_size;		// VPP-TBD: Hack until support setsockopt(SO_RCVBUF)
-  u32 user_mss;			// VPP-TBD: Hack until support setsockopt(TCP_MAXSEG)
-  u8 *segment_name;
-  u32 sm_seg_index;
-  u32 client_context;
-  u64 vpp_handle;
-
-  /* Socket configuration state */
-  u8 is_vep;
-  u8 is_vep_session;
-  u32 attr;
-  u32 wait_cont_idx;
-  vppcom_epoll_t vep;
-  int libc_epfd;
-  u64 client_queue_address;
-  u64 options[16];
-  vce_event_handler_reg_t *poll_reg;
-#if VCL_ELOG
-  elog_track_t elog_track;
-#endif
-} vcl_session_t;
-
-typedef struct vppcom_cfg_t_
-{
-  u64 heapsize;
-  u32 vpp_api_q_length;
-  u64 segment_baseva;
-  u32 segment_size;
-  u32 add_segment_size;
-  u32 preallocated_fifo_pairs;
-  u32 rx_fifo_size;
-  u32 tx_fifo_size;
-  u32 event_queue_size;
-  u32 listen_queue_size;
-  u8 app_proxy_transport_tcp;
-  u8 app_proxy_transport_udp;
-  u8 app_scope_local;
-  u8 app_scope_global;
-  u8 *namespace_id;
-  u64 namespace_secret;
-  f64 app_timeout;
-  f64 session_timeout;
-  f64 accept_timeout;
-  u32 event_ring_size;
-  char *event_log_path;
-  u8 *vpp_api_filename;
-} vppcom_cfg_t;
-
-typedef struct vppcom_main_t_
-{
-  u8 init;
-  u32 debug;
-  int main_cpu;
-
-  /* FIFO for accepted connections - used in epoll/select */
-  clib_spinlock_t session_fifo_lockp;
-  u32 *client_session_index_fifo;
-
-  /* vpp input queue */
-  svm_queue_t *vl_input_queue;
-
-  /* API client handle */
-  u32 my_client_index;
-  /* Session pool */
-  clib_spinlock_t sessions_lockp;
-  vcl_session_t *sessions;
-
-  /* Hash table for disconnect processing */
-  uword *session_index_by_vpp_handles;
-
-  /* Select bitmaps */
-  clib_bitmap_t *rd_bitmap;
-  clib_bitmap_t *wr_bitmap;
-  clib_bitmap_t *ex_bitmap;
-
-  /* Our event queue */
-  svm_queue_t *app_event_queue;
-
-  /* unique segment name counter */
-  u32 unique_segment_index;
-
-  /* For deadman timers */
-  clib_time_t clib_time;
-
-  /* State of the connection, shared between msg RX thread and main thread */
-  volatile app_state_t app_state;
-
-  vppcom_cfg_t cfg;
-
-  /* Event thread */
-  vce_event_thread_t event_thread;
-
-  /* IO thread */
-  vppcom_session_io_thread_t session_io_thread;
-
-#ifdef VCL_ELOG
-  /* VPP Event-logger */
-  elog_main_t elog_main;
-  elog_track_t elog_track;
-#endif
-
-  /* VNET_API_ERROR_FOO -> "Foo" hash table */
-  uword *error_string_by_error_number;
-} vppcom_main_t;
-
-/* NOTE: _vppcom_main is only used until the heap is allocated.
- *       Do not access it directly -- use vcm which will point to
- *       the heap allocated copy after init.
- */
-static vppcom_main_t _vppcom_main = {
-  .debug = VPPCOM_DEBUG_INIT,
-  .my_client_index = ~0
-};
-
-static vppcom_main_t *vcm = &_vppcom_main;
-
-#define VCL_SESSION_LOCK_AND_GET(I, S)                          \
-do {                                                            \
-  clib_spinlock_lock (&vcm->sessions_lockp);                    \
-  rv = vppcom_session_at_index (I, S);                          \
-  if (PREDICT_FALSE (rv))                                       \
-    {                                                           \
-      clib_spinlock_unlock (&vcm->sessions_lockp);              \
-      clib_warning ("VCL<%d>: ERROR: Invalid ##I (%u)!",        \
-                    getpid (), I);                              \
-      goto done;                                                \
-    }                                                           \
-} while (0)
-
-#define VCL_SESSION_LOCK() clib_spinlock_lock (&(vcm->sessions_lockp))
-#define VCL_SESSION_UNLOCK() clib_spinlock_unlock (&(vcm->sessions_lockp))
-
-#define VCL_IO_SESSIONS_LOCK() \
-  clib_spinlock_lock (&(vcm->session_io_thread.io_sessions_lockp))
-#define VCL_IO_SESSIONS_UNLOCK() \
-  clib_spinlock_unlock (&(vcm->session_io_thread.io_sessions_lockp))
-
-#define VCL_ACCEPT_FIFO_LOCK() clib_spinlock_lock (&(vcm->session_fifo_lockp))
-#define VCL_ACCEPT_FIFO_UNLOCK() \
-  clib_spinlock_unlock (&(vcm->session_fifo_lockp))
-
-#define VCL_EVENTS_LOCK() \
-  clib_spinlock_lock (&(vcm->event_thread.events_lockp))
-#define VCL_EVENTS_UNLOCK() \
-  clib_spinlock_unlock (&(vcm->event_thread.events_lockp))
+#include <vcl/vcl_private.h>
 
 static const char *
 vppcom_app_state_str (app_state_t state)
@@ -314,7 +52,7 @@ vppcom_app_state_str (app_state_t state)
   return st;
 }
 
-static const char *
+const char *
 vppcom_session_state_str (session_state_t state)
 {
   char *st;
@@ -357,139 +95,98 @@ vppcom_session_state_str (session_state_t state)
   return st;
 }
 
-
-/*
- * VPPCOM Utility Functions
- */
-
-static inline int
-vppcom_session_at_index (u32 session_index, vcl_session_t * volatile *sess)
-{
-  /* Assumes that caller has acquired spinlock: vcm->sessions_lockp */
-  if (PREDICT_FALSE ((session_index == ~0) ||
-		     pool_is_free_index (vcm->sessions, session_index)))
-    {
-      clib_warning ("VCL<%d>: invalid session, sid (%u) has been closed!",
-		    getpid (), session_index);
-      return VPPCOM_EBADFD;
-    }
-  *sess = pool_elt_at_index (vcm->sessions, session_index);
-  return VPPCOM_OK;
-}
-
-static inline void
-vppcom_session_table_add_listener (u64 listener_handle, u32 value)
+u8 *
+format_ip4_address (u8 * s, va_list * args)
 {
-  /* Session and listener handles have different formats. The latter has
-   * the thread index in the upper 32 bits while the former has the session
-   * type. Knowing that, for listeners we just flip the MSB to 1 */
-  listener_handle |= 1ULL << 63;
-  hash_set (vcm->session_index_by_vpp_handles, listener_handle, value);
+  u8 *a = va_arg (*args, u8 *);
+  return format (s, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
 }
 
-static inline vcl_session_t *
-vppcom_session_table_lookup_listener (u64 listener_handle)
+u8 *
+format_ip6_address (u8 * s, va_list * args)
 {
-  uword *p;
-  u64 handle = listener_handle | (1ULL << 63);
-  vcl_session_t *session;
+  ip6_address_t *a = va_arg (*args, ip6_address_t *);
+  u32 i, i_max_n_zero, max_n_zeros, i_first_zero, n_zeros, last_double_colon;
 
-  p = hash_get (vcm->session_index_by_vpp_handles, handle);
-  if (!p)
+  i_max_n_zero = ARRAY_LEN (a->as_u16);
+  max_n_zeros = 0;
+  i_first_zero = i_max_n_zero;
+  n_zeros = 0;
+  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
     {
-      clib_warning ("VCL<%d>: couldn't find listen session: unknown vpp "
-		    "listener handle %llx", getpid (), listener_handle);
-      return 0;
+      u32 is_zero = a->as_u16[i] == 0;
+      if (is_zero && i_first_zero >= ARRAY_LEN (a->as_u16))
+	{
+	  i_first_zero = i;
+	  n_zeros = 0;
+	}
+      n_zeros += is_zero;
+      if ((!is_zero && n_zeros > max_n_zeros)
+	  || (i + 1 >= ARRAY_LEN (a->as_u16) && n_zeros > max_n_zeros))
+	{
+	  i_max_n_zero = i_first_zero;
+	  max_n_zeros = n_zeros;
+	  i_first_zero = ARRAY_LEN (a->as_u16);
+	  n_zeros = 0;
+	}
     }
-  if (pool_is_free_index (vcm->sessions, p[0]))
+
+  last_double_colon = 0;
+  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
     {
-      VDBG (1, "VCL<%d>: invalid listen session, sid (%u)", getpid (), p[0]);
-      return 0;
+      if (i == i_max_n_zero && max_n_zeros > 1)
+	{
+	  s = format (s, "::");
+	  i += max_n_zeros - 1;
+	  last_double_colon = 1;
+	}
+      else
+	{
+	  s = format (s, "%s%x",
+		      (last_double_colon || i == 0) ? "" : ":",
+		      clib_net_to_host_u16 (a->as_u16[i]));
+	  last_double_colon = 0;
+	}
     }
 
-  session = pool_elt_at_index (vcm->sessions, p[0]);
-  ASSERT (session->session_state & STATE_LISTEN);
-  return session;
-}
-
-static inline void
-vppcom_session_table_del_listener (u64 listener_handle)
-{
-  listener_handle |= 1ULL << 63;
-  hash_unset (vcm->session_index_by_vpp_handles, listener_handle);
-}
-
-static inline void
-vppcom_send_accept_session_reply (u64 handle, u32 context, int retval)
-{
-  vl_api_accept_session_reply_t *rmp;
-
-  rmp = vl_msg_api_alloc (sizeof (*rmp));
-  memset (rmp, 0, sizeof (*rmp));
-  rmp->_vl_msg_id = ntohs (VL_API_ACCEPT_SESSION_REPLY);
-  rmp->retval = htonl (retval);
-  rmp->context = context;
-  rmp->handle = handle;
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & rmp);
+  return s;
 }
 
-static int
-vppcom_connect_to_vpp (char *app_name)
+/* Format an IP46 address. */
+u8 *
+format_ip46_address (u8 * s, va_list * args)
 {
-  api_main_t *am = &api_main;
-  vppcom_cfg_t *vcl_cfg = &vcm->cfg;
-  int rv = VPPCOM_OK;
-
-  if (!vcl_cfg->vpp_api_filename)
-    vcl_cfg->vpp_api_filename = format (0, "/vpe-api%c", 0);
-
-  VDBG (0, "VCL<%d>: app (%s) connecting to VPP api (%s)...",
-	getpid (), app_name, vcl_cfg->vpp_api_filename);
+  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
+  ip46_type_t type = va_arg (*args, ip46_type_t);
+  int is_ip4 = 1;
 
-  if (vl_client_connect_to_vlib ((char *) vcl_cfg->vpp_api_filename, app_name,
-				 vcm->cfg.vpp_api_q_length) < 0)
-    {
-      clib_warning ("VCL<%d>: app (%s) connect failed!", getpid (), app_name);
-      rv = VPPCOM_ECONNREFUSED;
-    }
-  else
+  switch (type)
     {
-      vcm->vl_input_queue = am->shmem_hdr->vl_input_queue;
-      vcm->my_client_index = (u32) am->my_client_index;
-      vcm->app_state = STATE_APP_CONN_VPP;
-
-      VDBG (0, "VCL<%d>: app (%s) is connected to VPP!", getpid (), app_name);
+    case IP46_TYPE_ANY:
+      is_ip4 = ip46_address_is_ip4 (ip46);
+      break;
+    case IP46_TYPE_IP4:
+      is_ip4 = 1;
+      break;
+    case IP46_TYPE_IP6:
+      is_ip4 = 0;
+      break;
     }
 
-  vcl_evt (VCL_EVT_INIT, vcm);
-  return rv;
+  return is_ip4 ?
+    format (s, "%U", format_ip4_address, &ip46->ip4) :
+    format (s, "%U", format_ip6_address, &ip46->ip6);
 }
 
-static u8 *
-format_api_error (u8 * s, va_list * args)
-{
-  i32 error = va_arg (*args, u32);
-  uword *p;
-
-  p = hash_get (vcm->error_string_by_error_number, -error);
-
-  if (p)
-    s = format (s, "%s (%d)", p[0], error);
-  else
-    s = format (s, "%d", error);
-  return s;
-}
+/*
+ * VPPCOM Utility Functions
+ */
 
-static void
-vppcom_init_error_string_table (void)
+static inline void
+vppcom_session_table_del_listener (u64 listener_handle)
 {
-  vcm->error_string_by_error_number = hash_create (0, sizeof (uword));
-
-#define _(n, v, s) hash_set (vcm->error_string_by_error_number, -v, s);
-  foreach_vnet_api_error;
-#undef _
-
-  hash_set (vcm->error_string_by_error_number, 99, "Misc");
+  listener_handle |= 1ULL << 63;
+  hash_unset (vcm->session_index_by_vpp_handles, listener_handle);
 }
 
 static inline int
@@ -549,23 +246,6 @@ vppcom_wait_for_session_state_change (u32 session_index,
   return VPPCOM_ETIMEDOUT;
 }
 
-/*
- * VPP-API message functions
- */
-static void
-vppcom_send_session_enable_disable (u8 is_enable)
-{
-  vl_api_session_enable_disable_t *bmp;
-  bmp = vl_msg_api_alloc (sizeof (*bmp));
-  memset (bmp, 0, sizeof (*bmp));
-
-  bmp->_vl_msg_id = ntohs (VL_API_SESSION_ENABLE_DISABLE);
-  bmp->client_index = vcm->my_client_index;
-  bmp->context = htonl (0xfeedface);
-  bmp->is_enable = is_enable;
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
-}
-
 static int
 vppcom_app_session_enable (void)
 {
@@ -585,57 +265,6 @@ vppcom_app_session_enable (void)
   return VPPCOM_OK;
 }
 
-static void
-  vl_api_session_enable_disable_reply_t_handler
-  (vl_api_session_enable_disable_reply_t * mp)
-{
-  if (mp->retval)
-    {
-      clib_warning ("VCL<%d>: session_enable_disable failed: %U", getpid (),
-		    format_api_error, ntohl (mp->retval));
-    }
-  else
-    vcm->app_state = STATE_APP_ENABLED;
-}
-
-static void
-vppcom_app_send_attach (void)
-{
-  vl_api_application_attach_t *bmp;
-  u8 nsid_len = vec_len (vcm->cfg.namespace_id);
-  u8 app_is_proxy = (vcm->cfg.app_proxy_transport_tcp ||
-		     vcm->cfg.app_proxy_transport_udp);
-
-  bmp = vl_msg_api_alloc (sizeof (*bmp));
-  memset (bmp, 0, sizeof (*bmp));
-
-  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_ATTACH);
-  bmp->client_index = vcm->my_client_index;
-  bmp->context = htonl (0xfeedface);
-  bmp->options[APP_OPTIONS_FLAGS] =
-    APP_OPTIONS_FLAGS_ACCEPT_REDIRECT | APP_OPTIONS_FLAGS_ADD_SEGMENT |
-    (vcm->cfg.app_scope_local ? APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE : 0) |
-    (vcm->cfg.app_scope_global ? APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE : 0) |
-    (app_is_proxy ? APP_OPTIONS_FLAGS_IS_PROXY : 0);
-  bmp->options[APP_OPTIONS_PROXY_TRANSPORT] =
-    (u64) ((vcm->cfg.app_proxy_transport_tcp ? 1 << TRANSPORT_PROTO_TCP : 0) |
-	   (vcm->cfg.app_proxy_transport_udp ? 1 << TRANSPORT_PROTO_UDP : 0));
-  bmp->options[APP_OPTIONS_SEGMENT_SIZE] = vcm->cfg.segment_size;
-  bmp->options[APP_OPTIONS_ADD_SEGMENT_SIZE] = vcm->cfg.add_segment_size;
-  bmp->options[APP_OPTIONS_RX_FIFO_SIZE] = vcm->cfg.rx_fifo_size;
-  bmp->options[APP_OPTIONS_TX_FIFO_SIZE] = vcm->cfg.tx_fifo_size;
-  bmp->options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] =
-    vcm->cfg.preallocated_fifo_pairs;
-  bmp->options[APP_OPTIONS_EVT_QUEUE_SIZE] = vcm->cfg.event_queue_size;
-  if (nsid_len)
-    {
-      bmp->namespace_id_len = nsid_len;
-      clib_memcpy (bmp->namespace_id, vcm->cfg.namespace_id, nsid_len);
-      bmp->options[APP_OPTIONS_NAMESPACE_SECRET] = vcm->cfg.namespace_secret;
-    }
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
-}
-
 static int
 vppcom_app_attach (void)
 {
@@ -653,602 +282,6 @@ vppcom_app_attach (void)
   return VPPCOM_OK;
 }
 
-static void
-vppcom_app_detach (void)
-{
-  vl_api_application_detach_t *bmp;
-  bmp = vl_msg_api_alloc (sizeof (*bmp));
-  memset (bmp, 0, sizeof (*bmp));
-
-  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_DETACH);
-  bmp->client_index = vcm->my_client_index;
-  bmp->context = htonl (0xfeedface);
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
-}
-
-static void
-vl_api_application_attach_reply_t_handler (vl_api_application_attach_reply_t *
-					   mp)
-{
-  static svm_fifo_segment_create_args_t _a;
-  svm_fifo_segment_create_args_t *a = &_a;
-  int rv;
-
-  memset (a, 0, sizeof (*a));
-  if (mp->retval)
-    {
-      clib_warning ("VCL<%d>: attach failed: %U", getpid (),
-		    format_api_error, ntohl (mp->retval));
-      return;
-    }
-
-  if (mp->segment_name_length == 0)
-    {
-      clib_warning ("VCL<%d>: segment_name_length zero", getpid ());
-      return;
-    }
-
-  a->segment_name = (char *) mp->segment_name;
-  a->segment_size = mp->segment_size;
-
-  ASSERT (mp->app_event_queue_address);
-
-  /* Attach to the segment vpp created */
-  rv = svm_fifo_segment_attach (a);
-  vec_reset_length (a->new_segment_indices);
-  if (PREDICT_FALSE (rv))
-    {
-      clib_warning ("VCL<%d>: svm_fifo_segment_attach ('%s') failed",
-		    getpid (), mp->segment_name);
-      return;
-    }
-
-  vcm->app_event_queue =
-    uword_to_pointer (mp->app_event_queue_address, svm_queue_t *);
-
-  vcm->app_state = STATE_APP_ATTACHED;
-}
-
-static void
-vl_api_application_detach_reply_t_handler (vl_api_application_detach_reply_t *
-					   mp)
-{
-  if (mp->retval)
-    clib_warning ("VCL<%d>: detach failed: %U", getpid (), format_api_error,
-		  ntohl (mp->retval));
-
-  vcm->app_state = STATE_APP_ENABLED;
-}
-
-static void
-vl_api_disconnect_session_reply_t_handler (vl_api_disconnect_session_reply_t *
-					   mp)
-{
-  if (mp->retval)
-    clib_warning ("VCL<%d>: vpp handle 0x%llx: disconnect session failed: %U",
-		  getpid (), mp->handle, format_api_error,
-		  ntohl (mp->retval));
-}
-
-static void
-vl_api_map_another_segment_t_handler (vl_api_map_another_segment_t * mp)
-{
-  static svm_fifo_segment_create_args_t _a;
-  svm_fifo_segment_create_args_t *a = &_a;
-  int rv;
-
-  memset (a, 0, sizeof (*a));
-  a->segment_name = (char *) mp->segment_name;
-  a->segment_size = mp->segment_size;
-  /* Attach to the segment vpp created */
-  rv = svm_fifo_segment_attach (a);
-  vec_reset_length (a->new_segment_indices);
-  if (PREDICT_FALSE (rv))
-    {
-      clib_warning ("VCL<%d>: svm_fifo_segment_attach ('%s') failed",
-		    getpid (), mp->segment_name);
-      return;
-    }
-
-  VDBG (1, "VCL<%d>: mapped new segment '%s' size %d", getpid (),
-	mp->segment_name, mp->segment_size);
-}
-
-static void
-vl_api_unmap_segment_t_handler (vl_api_unmap_segment_t * mp)
-{
-
-/*
- * XXX Need segment_name to session_id hash,
- * XXX - have sessionID by handle hash currently
- */
-
-  VDBG (1, "Unmapped segment '%s'", mp->segment_name);
-}
-
-static void
-vl_api_disconnect_session_t_handler (vl_api_disconnect_session_t * mp)
-{
-  uword *p;
-
-  p = hash_get (vcm->session_index_by_vpp_handles, mp->handle);
-  if (p)
-    {
-      int rv;
-      vcl_session_t *session = 0;
-      u32 session_index = p[0];
-
-      VCL_SESSION_LOCK_AND_GET (session_index, &session);
-      session->session_state = STATE_CLOSE_ON_EMPTY;
-
-      VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: setting state to 0x%x "
-	    "(%s)", getpid (), mp->handle, session_index,
-	    session->session_state,
-	    vppcom_session_state_str (session->session_state));
-      VCL_SESSION_UNLOCK ();
-      return;
-
-    done:
-      VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: session lookup failed!",
-	    getpid (), mp->handle, session_index);
-    }
-  else
-    clib_warning ("VCL<%d>: vpp handle 0x%llx: session lookup by "
-		  "handle failed!", getpid (), mp->handle);
-}
-
-static void
-vl_api_reset_session_t_handler (vl_api_reset_session_t * mp)
-{
-  vcl_session_t *session = 0;
-  vl_api_reset_session_reply_t *rmp;
-  uword *p;
-  int rv = 0;
-
-  p = hash_get (vcm->session_index_by_vpp_handles, mp->handle);
-  if (p)
-    {
-      int rval;
-      VCL_SESSION_LOCK ();
-      rval = vppcom_session_at_index (p[0], &session);
-      if (PREDICT_FALSE (rval))
-	{
-	  rv = VNET_API_ERROR_INVALID_VALUE_2;
-	  clib_warning ("VCL<%d>: ERROR: vpp handle 0x%llx, sid %u: "
-			"session lookup failed! returning %d %U",
-			getpid (), mp->handle, p[0],
-			rv, format_api_error, rv);
-	}
-      else
-	{
-	  /* TBD: should this disconnect immediately and
-	   * flush the fifos?
-	   */
-	  session->session_state = STATE_CLOSE_ON_EMPTY;
-
-	  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: state set to %d "
-		"(%s)!", getpid (), mp->handle, p[0], session->session_state,
-		vppcom_session_state_str (session->session_state));
-	}
-      VCL_SESSION_UNLOCK ();
-    }
-  else
-    {
-      rv = VNET_API_ERROR_INVALID_VALUE;
-      clib_warning ("VCL<%d>: ERROR: vpp handle 0x%llx: session lookup "
-		    "failed! returning %d %U",
-		    getpid (), mp->handle, rv, format_api_error, rv);
-    }
-
-  rmp = vl_msg_api_alloc (sizeof (*rmp));
-  memset (rmp, 0, sizeof (*rmp));
-  rmp->_vl_msg_id = ntohs (VL_API_RESET_SESSION_REPLY);
-  rmp->retval = htonl (rv);
-  rmp->handle = mp->handle;
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & rmp);
-}
-
-static void
-vl_api_connect_session_reply_t_handler (vl_api_connect_session_reply_t * mp)
-{
-  vcl_session_t *session = 0;
-  u32 session_index;
-  svm_fifo_t *rx_fifo, *tx_fifo;
-  int rv = VPPCOM_OK;
-
-  session_index = mp->context;
-  VCL_SESSION_LOCK_AND_GET (session_index, &session);
-done:
-  if (mp->retval)
-    {
-      clib_warning ("VCL<%d>: ERROR: vpp handle 0x%llx, sid %u: "
-		    "connect failed! %U",
-		    getpid (), mp->handle, session_index,
-		    format_api_error, ntohl (mp->retval));
-      if (session)
-	{
-	  session->session_state = STATE_FAILED;
-	  session->vpp_handle = mp->handle;
-	}
-      else
-	{
-	  clib_warning ("[%s] ERROR: vpp handle 0x%llx, sid %u: "
-			"Invalid session index (%u)!",
-			getpid (), mp->handle, session_index);
-	}
-      goto done_unlock;
-    }
-
-  if (rv)
-    goto done_unlock;
-
-  /*
-   * Setup session
-   */
-  if (vcm->session_io_thread.io_sessions_lockp)
-    {
-      // Add this connection to the active io sessions list
-      VCL_IO_SESSIONS_LOCK ();
-      u32 *active_session_index;
-      pool_get (vcm->session_io_thread.active_session_indexes,
-		active_session_index);
-      *active_session_index = session_index;
-      VCL_IO_SESSIONS_UNLOCK ();
-    }
-  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
-					 svm_queue_t *);
-
-  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
-  rx_fifo->client_session_index = session_index;
-  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
-  tx_fifo->client_session_index = session_index;
-
-  session->rx_fifo = rx_fifo;
-  session->tx_fifo = tx_fifo;
-  session->vpp_handle = mp->handle;
-  session->transport.is_ip4 = mp->is_ip4;
-  clib_memcpy (&session->transport.lcl_ip, mp->lcl_ip,
-	       sizeof (session->transport.rmt_ip));
-  session->transport.lcl_port = mp->lcl_port;
-  session->session_state = STATE_CONNECT;
-
-  /* Add it to lookup table */
-  hash_set (vcm->session_index_by_vpp_handles, mp->handle, session_index);
-
-  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: connect succeeded! "
-	"session_rx_fifo %p, refcnt %d, session_tx_fifo %p, refcnt %d",
-	getpid (), mp->handle, session_index, session->rx_fifo,
-	session->rx_fifo->refcnt, session->tx_fifo, session->tx_fifo->refcnt);
-done_unlock:
-  VCL_SESSION_UNLOCK ();
-}
-
-static void
-vppcom_send_connect_sock (vcl_session_t * session, u32 session_index)
-{
-  vl_api_connect_sock_t *cmp;
-
-  /* Assumes caller as acquired the spinlock: vcm->sessions_lockp */
-  cmp = vl_msg_api_alloc (sizeof (*cmp));
-  memset (cmp, 0, sizeof (*cmp));
-  cmp->_vl_msg_id = ntohs (VL_API_CONNECT_SOCK);
-  cmp->client_index = vcm->my_client_index;
-  cmp->context = session_index;
-
-  cmp->is_ip4 = session->transport.is_ip4;
-  clib_memcpy (cmp->ip, &session->transport.rmt_ip, sizeof (cmp->ip));
-  cmp->port = session->transport.rmt_port;
-  cmp->proto = session->session_type;
-  clib_memcpy (cmp->options, session->options, sizeof (cmp->options));
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & cmp);
-}
-
-static inline void
-vppcom_send_disconnect_session_reply (u64 vpp_handle, u32 session_index,
-				      int rv)
-{
-  vl_api_disconnect_session_reply_t *rmp;
-
-  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: sending disconnect msg",
-	getpid (), vpp_handle, session_index);
-
-  rmp = vl_msg_api_alloc (sizeof (*rmp));
-  memset (rmp, 0, sizeof (*rmp));
-
-  rmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION_REPLY);
-  rmp->retval = htonl (rv);
-  rmp->handle = vpp_handle;
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & rmp);
-}
-
-static inline void
-vppcom_send_disconnect_session (u64 vpp_handle, u32 session_index)
-{
-  vl_api_disconnect_session_t *dmp;
-
-  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: sending disconnect msg",
-	getpid (), vpp_handle, session_index);
-
-  dmp = vl_msg_api_alloc (sizeof (*dmp));
-  memset (dmp, 0, sizeof (*dmp));
-  dmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION);
-  dmp->client_index = vcm->my_client_index;
-  dmp->handle = vpp_handle;
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & dmp);
-}
-
-static void
-vl_api_bind_sock_reply_t_handler (vl_api_bind_sock_reply_t * mp)
-{
-  vcl_session_t *session = 0;
-  u32 session_index = mp->context;
-  int rv;
-
-  VCL_SESSION_LOCK_AND_GET (session_index, &session);
-done:
-  if (mp->retval)
-    {
-      clib_warning ("VCL<%d>: ERROR: vpp handle 0x%llx, "
-		    "sid %u: bind failed: %U",
-		    getpid (), mp->handle, session_index,
-		    format_api_error, ntohl (mp->retval));
-      rv = vppcom_session_at_index (session_index, &session);
-      if (rv == VPPCOM_OK)
-	{
-	  session->session_state = STATE_FAILED;
-	  session->vpp_handle = mp->handle;
-	}
-      else
-	{
-	  clib_warning ("[%s] ERROR: vpp handle 0x%llx, sid %u: "
-			"Invalid session index (%u)!",
-			getpid (), mp->handle, session_index);
-	}
-      goto done_unlock;
-    }
-
-  session->vpp_handle = mp->handle;
-  session->transport.is_ip4 = mp->lcl_is_ip4;
-  session->transport.lcl_ip = to_ip46 (mp->lcl_is_ip4 ? IP46_TYPE_IP4 :
-				       IP46_TYPE_IP6, mp->lcl_ip);
-  session->transport.lcl_port = mp->lcl_port;
-  vppcom_session_table_add_listener (mp->handle, session_index);
-  session->session_state = STATE_LISTEN;
-
-  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: bind succeeded!",
-	getpid (), mp->handle, mp->context);
-done_unlock:
-  VCL_SESSION_UNLOCK ();
-}
-
-static void
-vl_api_unbind_sock_reply_t_handler (vl_api_unbind_sock_reply_t * mp)
-{
-  if (mp->retval)
-    clib_warning ("VCL<%d>: ERROR: sid %u: unbind failed: %U",
-		  getpid (), mp->context, format_api_error,
-		  ntohl (mp->retval));
-
-  else
-    VDBG (1, "VCL<%d>: sid %u: unbind succeeded!", getpid (), mp->context);
-}
-
-u8 *
-format_ip4_address (u8 * s, va_list * args)
-{
-  u8 *a = va_arg (*args, u8 *);
-  return format (s, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
-}
-
-u8 *
-format_ip6_address (u8 * s, va_list * args)
-{
-  ip6_address_t *a = va_arg (*args, ip6_address_t *);
-  u32 i, i_max_n_zero, max_n_zeros, i_first_zero, n_zeros, last_double_colon;
-
-  i_max_n_zero = ARRAY_LEN (a->as_u16);
-  max_n_zeros = 0;
-  i_first_zero = i_max_n_zero;
-  n_zeros = 0;
-  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
-    {
-      u32 is_zero = a->as_u16[i] == 0;
-      if (is_zero && i_first_zero >= ARRAY_LEN (a->as_u16))
-	{
-	  i_first_zero = i;
-	  n_zeros = 0;
-	}
-      n_zeros += is_zero;
-      if ((!is_zero && n_zeros > max_n_zeros)
-	  || (i + 1 >= ARRAY_LEN (a->as_u16) && n_zeros > max_n_zeros))
-	{
-	  i_max_n_zero = i_first_zero;
-	  max_n_zeros = n_zeros;
-	  i_first_zero = ARRAY_LEN (a->as_u16);
-	  n_zeros = 0;
-	}
-    }
-
-  last_double_colon = 0;
-  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
-    {
-      if (i == i_max_n_zero && max_n_zeros > 1)
-	{
-	  s = format (s, "::");
-	  i += max_n_zeros - 1;
-	  last_double_colon = 1;
-	}
-      else
-	{
-	  s = format (s, "%s%x",
-		      (last_double_colon || i == 0) ? "" : ":",
-		      clib_net_to_host_u16 (a->as_u16[i]));
-	  last_double_colon = 0;
-	}
-    }
-
-  return s;
-}
-
-/* Format an IP46 address. */
-u8 *
-format_ip46_address (u8 * s, va_list * args)
-{
-  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
-  ip46_type_t type = va_arg (*args, ip46_type_t);
-  int is_ip4 = 1;
-
-  switch (type)
-    {
-    case IP46_TYPE_ANY:
-      is_ip4 = ip46_address_is_ip4 (ip46);
-      break;
-    case IP46_TYPE_IP4:
-      is_ip4 = 1;
-      break;
-    case IP46_TYPE_IP6:
-      is_ip4 = 0;
-      break;
-    }
-
-  return is_ip4 ?
-    format (s, "%U", format_ip4_address, &ip46->ip4) :
-    format (s, "%U", format_ip6_address, &ip46->ip6);
-}
-
-static void
-vl_api_accept_session_t_handler (vl_api_accept_session_t * mp)
-{
-  svm_fifo_t *rx_fifo, *tx_fifo;
-  vcl_session_t *session, *listen_session;
-  u32 session_index;
-  vce_event_connect_request_t *ecr;
-  vce_event_t *ev;
-  int rv;
-  u32 ev_idx;
-  uword elts = 0;
-
-  VCL_SESSION_LOCK ();
-
-  VCL_ACCEPT_FIFO_LOCK ();
-  elts = clib_fifo_free_elts (vcm->client_session_index_fifo);
-  VCL_ACCEPT_FIFO_UNLOCK ();
-
-  if (!elts)
-    {
-      clib_warning ("VCL<%d>: client session queue is full!", getpid ());
-      vppcom_send_accept_session_reply (mp->handle, mp->context,
-					VNET_API_ERROR_QUEUE_FULL);
-      VCL_SESSION_UNLOCK ();
-      return;
-    }
-
-  listen_session = vppcom_session_table_lookup_listener (mp->listener_handle);
-  if (!listen_session)
-    {
-      clib_warning ("VCL<%d>: ERROR: couldn't find listen session: "
-		    "unknown vpp listener handle %llx",
-		    getpid (), mp->listener_handle);
-      vppcom_send_accept_session_reply (mp->handle, mp->context,
-					VNET_API_ERROR_INVALID_ARGUMENT);
-      VCL_SESSION_UNLOCK ();
-      return;
-    }
-
-  /* TODO check listener depth and update */
-  /* TODO on "child" fd close, update listener depth */
-
-  /* Allocate local session and set it up */
-  pool_get (vcm->sessions, session);
-  memset (session, 0, sizeof (*session));
-  session_index = (u32) (session - vcm->sessions);
-
-  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
-  rx_fifo->client_session_index = session_index;
-  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
-  tx_fifo->client_session_index = session_index;
-
-  session->vpp_handle = mp->handle;
-  session->client_context = mp->context;
-  session->rx_fifo = rx_fifo;
-  session->tx_fifo = tx_fifo;
-  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
-					 svm_queue_t *);
-  session->session_state = STATE_ACCEPT;
-  session->transport.rmt_port = mp->port;
-  session->transport.is_ip4 = mp->is_ip4;
-  session->transport.rmt_ip = to_ip46 (mp->is_ip4 ? IP46_TYPE_IP4 :
-				       IP46_TYPE_IP6, mp->ip);
-
-  /* Add it to lookup table */
-  hash_set (vcm->session_index_by_vpp_handles, mp->handle, session_index);
-  session->transport.lcl_port = listen_session->transport.lcl_port;
-  session->transport.lcl_ip = listen_session->transport.lcl_ip;
-
-  /* Create an event for handlers */
-
-  VCL_EVENTS_LOCK ();
-
-  pool_get (vcm->event_thread.vce_events, ev);
-  ev_idx = (u32) (ev - vcm->event_thread.vce_events);
-  ecr = vce_get_event_data (ev, sizeof (*ecr));
-  ev->evk.eid = VCL_EVENT_CONNECT_REQ_ACCEPTED;
-  listen_session = vppcom_session_table_lookup_listener (mp->listener_handle);
-  ev->evk.session_index = (u32) (listen_session - vcm->sessions);
-  ecr->accepted_session_index = session_index;
-
-  VCL_EVENTS_UNLOCK ();
-
-  rv = vce_generate_event (&vcm->event_thread, ev_idx);
-  ASSERT (rv == 0);
-
-  VDBG (1, "VCL<%d>: vpp handle 0x%llx, sid %u: client accept request from %s"
-	" address %U port %d queue %p!", getpid (), mp->handle, session_index,
-	mp->is_ip4 ? "IPv4" : "IPv6", format_ip46_address, &mp->ip,
-	mp->is_ip4 ? IP46_TYPE_IP4 : IP46_TYPE_IP6,
-	clib_net_to_host_u16 (mp->port), session->vpp_evt_q);
-
-  vcl_evt (VCL_EVT_ACCEPT, session, listen_session, session_index);
-  VCL_SESSION_UNLOCK ();
-}
-
-/* VPP combines bind and listen as one operation. VCL manages the separation
- * of bind and listen locally via vppcom_session_bind() and
- * vppcom_session_listen() */
-static void
-vppcom_send_bind_sock (vcl_session_t * session, u32 session_index)
-{
-  vl_api_bind_sock_t *bmp;
-
-  /* Assumes caller has acquired spinlock: vcm->sessions_lockp */
-  bmp = vl_msg_api_alloc (sizeof (*bmp));
-  memset (bmp, 0, sizeof (*bmp));
-
-  bmp->_vl_msg_id = ntohs (VL_API_BIND_SOCK);
-  bmp->client_index = vcm->my_client_index;
-  bmp->context = session_index;
-  bmp->is_ip4 = session->transport.is_ip4;
-  clib_memcpy (bmp->ip, &session->transport.lcl_ip, sizeof (bmp->ip));
-  bmp->port = session->transport.lcl_port;
-  bmp->proto = session->session_type;
-  clib_memcpy (bmp->options, session->options, sizeof (bmp->options));
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & bmp);
-}
-
-static void
-vppcom_send_unbind_sock (u64 vpp_handle)
-{
-  vl_api_unbind_sock_t *ump;
-
-  ump = vl_msg_api_alloc (sizeof (*ump));
-  memset (ump, 0, sizeof (*ump));
-
-  ump->_vl_msg_id = ntohs (VL_API_UNBIND_SOCK);
-  ump->client_index = vcm->my_client_index;
-  ump->handle = vpp_handle;
-  vl_msg_api_send_shmem (vcm->vl_input_queue, (u8 *) & ump);
-}
-
 static int
 vppcom_session_unbind (u32 session_index)
 {
@@ -1275,7 +308,7 @@ done:
   return rv;
 }
 
-static inline int
+static int
 vppcom_session_disconnect (u32 session_index)
 {
   int rv;
@@ -1327,493 +360,6 @@ done:
   return rv;
 }
 
-#define foreach_sock_msg                                        \
-_(SESSION_ENABLE_DISABLE_REPLY, session_enable_disable_reply)   \
-_(BIND_SOCK_REPLY, bind_sock_reply)                             \
-_(UNBIND_SOCK_REPLY, unbind_sock_reply)                         \
-_(ACCEPT_SESSION, accept_session)                               \
-_(CONNECT_SESSION_REPLY, connect_session_reply)                 \
-_(DISCONNECT_SESSION, disconnect_session)                       \
-_(DISCONNECT_SESSION_REPLY, disconnect_session_reply)           \
-_(RESET_SESSION, reset_session)                                 \
-_(APPLICATION_ATTACH_REPLY, application_attach_reply)           \
-_(APPLICATION_DETACH_REPLY, application_detach_reply)           \
-_(MAP_ANOTHER_SEGMENT, map_another_segment)                     \
-_(UNMAP_SEGMENT, unmap_segment)
-
-static void
-vppcom_api_hookup (void)
-{
-#define _(N, n)                                                  \
-    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
-                           vl_api_##n##_t_handler,              \
-                           vl_noop_handler,                     \
-                           vl_api_##n##_t_endian,               \
-                           vl_api_##n##_t_print,                \
-                           sizeof(vl_api_##n##_t), 1);
-  foreach_sock_msg;
-#undef _
-}
-
-static void
-vppcom_cfg_init (vppcom_cfg_t * vcl_cfg)
-{
-  ASSERT (vcl_cfg);
-
-  vcl_cfg->heapsize = (256ULL << 20);
-  vcl_cfg->vpp_api_q_length = 1024;
-  vcl_cfg->segment_baseva = 0x200000000ULL;
-  vcl_cfg->segment_size = (256 << 20);
-  vcl_cfg->add_segment_size = (128 << 20);
-  vcl_cfg->preallocated_fifo_pairs = 8;
-  vcl_cfg->rx_fifo_size = (1 << 20);
-  vcl_cfg->tx_fifo_size = (1 << 20);
-  vcl_cfg->event_queue_size = 2048;
-  vcl_cfg->listen_queue_size = CLIB_CACHE_LINE_BYTES / sizeof (u32);
-  vcl_cfg->app_timeout = 10 * 60.0;
-  vcl_cfg->session_timeout = 10 * 60.0;
-  vcl_cfg->accept_timeout = 60.0;
-  vcl_cfg->event_ring_size = (128 << 10);
-  vcl_cfg->event_log_path = "/dev/shm";
-}
-
-static void
-vppcom_cfg_heapsize (char *conf_fname)
-{
-  vppcom_cfg_t *vcl_cfg = &vcm->cfg;
-  FILE *fp;
-  char inbuf[4096];
-  int argc = 1;
-  char **argv = NULL;
-  char *arg = NULL;
-  char *p;
-  int i;
-  u8 *sizep;
-  u32 size;
-  void *vcl_mem;
-  void *heap;
-
-  fp = fopen (conf_fname, "r");
-  if (fp == NULL)
-    {
-      VDBG (0, "VCL<%d>: using default heapsize %lld (0x%llx)", getpid (),
-	    vcl_cfg->heapsize, vcl_cfg->heapsize);
-      goto defaulted;
-    }
-
-  argv = calloc (1, sizeof (char *));
-  if (argv == NULL)
-    {
-      VDBG (0, "VCL<%d>: calloc failed, using default heapsize %lld (0x%llx)",
-	    getpid (), vcl_cfg->heapsize, vcl_cfg->heapsize);
-      goto defaulted;
-    }
-
-  while (1)
-    {
-      if (fgets (inbuf, 4096, fp) == 0)
-	break;
-      p = strtok (inbuf, " \t\n");
-      while (p != NULL)
-	{
-	  if (*p == '#')
-	    break;
-	  argc++;
-	  char **tmp = realloc (argv, argc * sizeof (char *));
-	  if (tmp == NULL)
-	    {
-	      VDBG (0, "VCL<%d>: realloc failed, using default heapsize %lld "
-		    "(0x%llx)", getpid (), vcl_cfg->heapsize,
-		    vcl_cfg->heapsize);
-	      goto defaulted;
-	    }
-	  argv = tmp;
-	  arg = strndup (p, 1024);
-	  if (arg == NULL)
-	    {
-	      VDBG (0, "VCL<%d>: strndup failed, using default heapsize %lld "
-		    "(0x%llx)", getpid (), vcl_cfg->heapsize,
-		    vcl_cfg->heapsize);
-	      goto defaulted;
-	    }
-	  argv[argc - 1] = arg;
-	  p = strtok (NULL, " \t\n");
-	}
-    }
-
-  fclose (fp);
-  fp = NULL;
-
-  char **tmp = realloc (argv, (argc + 1) * sizeof (char *));
-  if (tmp == NULL)
-    {
-      VDBG (0, "VCL<%d>: realloc failed, using default heapsize %lld "
-	    "(0x%llx)", getpid (), vcl_cfg->heapsize, vcl_cfg->heapsize);
-      goto defaulted;
-    }
-  argv = tmp;
-  argv[argc] = NULL;
-
-  /*
-   * Look for and parse the "heapsize" config parameter.
-   * Manual since none of the clib infra has been bootstrapped yet.
-   *
-   * Format: heapsize <nn>[mM][gG]
-   */
-
-  for (i = 1; i < (argc - 1); i++)
-    {
-      if (!strncmp (argv[i], "heapsize", 8))
-	{
-	  sizep = (u8 *) argv[i + 1];
-	  size = 0;
-	  while (*sizep >= '0' && *sizep <= '9')
-	    {
-	      size *= 10;
-	      size += *sizep++ - '0';
-	    }
-	  if (size == 0)
-	    {
-	      VDBG (0, "VCL<%d>: parse error '%s %s', using default "
-		    "heapsize %lld (0x%llx)", getpid (), argv[i], argv[i + 1],
-		    vcl_cfg->heapsize, vcl_cfg->heapsize);
-	      goto defaulted;
-	    }
-
-	  if (*sizep == 'g' || *sizep == 'G')
-	    vcl_cfg->heapsize = size << 30;
-	  else if (*sizep == 'm' || *sizep == 'M')
-	    vcl_cfg->heapsize = size << 20;
-	  else
-	    {
-	      VDBG (0, "VCL<%d>: parse error '%s %s', using default "
-		    "heapsize %lld (0x%llx)", getpid (), argv[i], argv[i + 1],
-		    vcl_cfg->heapsize, vcl_cfg->heapsize);
-	      goto defaulted;
-	    }
-	}
-    }
-
-defaulted:
-  if (fp != NULL)
-    fclose (fp);
-  if (argv != NULL)
-    free (argv);
-
-  vcl_mem = mmap (0, vcl_cfg->heapsize, PROT_READ | PROT_WRITE,
-		  MAP_SHARED | MAP_ANONYMOUS, -1, 0);
-  if (vcl_mem == MAP_FAILED)
-    {
-      clib_unix_error ("VCL<%d>: ERROR: mmap(0, %lld == 0x%llx, "
-		       "PROT_READ | PROT_WRITE,MAP_SHARED | MAP_ANONYMOUS, "
-		       "-1, 0) failed!",
-		       getpid (), vcl_cfg->heapsize, vcl_cfg->heapsize);
-      ASSERT (vcl_mem != MAP_FAILED);
-      return;
-    }
-  heap = clib_mem_init (vcl_mem, vcl_cfg->heapsize);
-  if (!heap)
-    {
-      clib_warning ("VCL<%d>: ERROR: clib_mem_init() failed!", getpid ());
-      ASSERT (heap);
-      return;
-    }
-  vcl_mem = clib_mem_alloc (sizeof (_vppcom_main));
-  if (!vcl_mem)
-    {
-      clib_warning ("VCL<%d>: ERROR: clib_mem_alloc() failed!", getpid ());
-      ASSERT (vcl_mem);
-      return;
-    }
-
-  clib_memcpy (vcl_mem, &_vppcom_main, sizeof (_vppcom_main));
-  vcm = vcl_mem;
-
-  VDBG (0, "VCL<%d>: allocated VCL heap = %p, size %lld (0x%llx)", getpid (),
-	heap, vcl_cfg->heapsize, vcl_cfg->heapsize);
-}
-
-static void
-vppcom_cfg_read (char *conf_fname)
-{
-  vppcom_cfg_t *vcl_cfg = &vcm->cfg;
-  int fd;
-  unformat_input_t _input, *input = &_input;
-  unformat_input_t _line_input, *line_input = &_line_input;
-  u8 vc_cfg_input = 0;
-  u8 *chroot_path;
-  struct stat s;
-  u32 uid, gid, q_len;
-
-  fd = open (conf_fname, O_RDONLY);
-  if (fd < 0)
-    {
-      VDBG (0, "VCL<%d>: using default configuration.", getpid (),
-	    conf_fname);
-      goto file_done;
-    }
-
-  if (fstat (fd, &s) < 0)
-    {
-      VDBG (0, "VCL<%d>: failed to stat `%s', using default configuration",
-	    getpid (), conf_fname);
-      goto file_done;
-    }
-
-  if (!(S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
-    {
-      VDBG (0, "VCL<%d>: not a regular file `%s', using default "
-	    "configuration", getpid (), conf_fname);
-      goto file_done;
-    }
-
-  unformat_init_clib_file (input, fd);
-
-  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
-    {
-      (void) unformat_user (input, unformat_line_input, line_input);
-      unformat_skip_white_space (line_input);
-
-      if (unformat (line_input, "vcl {"))
-	{
-	  vc_cfg_input = 1;
-	  continue;
-	}
-
-      if (vc_cfg_input)
-	{
-	  if (unformat (line_input, "heapsize %s", &chroot_path))
-	    {
-	      vec_terminate_c_string (chroot_path);
-	      VDBG (0, "VCL<%d>: configured heapsize %s, actual heapsize %lld"
-		    " (0x%llx)", getpid (), chroot_path, vcl_cfg->heapsize,
-		    vcl_cfg->heapsize);
-	      vec_free (chroot_path);
-	    }
-	  else if (unformat (line_input, "api-prefix %s", &chroot_path))
-	    {
-	      vec_terminate_c_string (chroot_path);
-	      if (vcl_cfg->vpp_api_filename)
-		vec_free (vcl_cfg->vpp_api_filename);
-	      vcl_cfg->vpp_api_filename = format (0, "/%s-vpe-api%c",
-						  chroot_path, 0);
-	      vl_set_memory_root_path ((char *) chroot_path);
-
-	      VDBG (0, "VCL<%d>: configured api-prefix (%s) and api filename"
-		    " (%s)", getpid (), chroot_path,
-		    vcl_cfg->vpp_api_filename);
-	      chroot_path = 0;	/* Don't vec_free() it! */
-	    }
-	  else if (unformat (line_input, "vpp-api-q-length %d", &q_len))
-	    {
-	      if (q_len < vcl_cfg->vpp_api_q_length)
-		{
-		  clib_warning ("VCL<%d>: ERROR: configured vpp-api-q-length "
-				"(%u) is too small! Using default: %u ",
-				getpid (), q_len, vcl_cfg->vpp_api_q_length);
-		}
-	      else
-		{
-		  vcl_cfg->vpp_api_q_length = q_len;
-
-		  VDBG (0, "VCL<%d>: configured vpp-api-q-length %u",
-			getpid (), vcl_cfg->vpp_api_q_length);
-		}
-	    }
-	  else if (unformat (line_input, "uid %d", &uid))
-	    {
-	      vl_set_memory_uid (uid);
-	      VDBG (0, "VCL<%d>: configured uid %d", getpid (), uid);
-	    }
-	  else if (unformat (line_input, "gid %d", &gid))
-	    {
-	      vl_set_memory_gid (gid);
-	      VDBG (0, "VCL<%d>: configured gid %d", getpid (), gid);
-	    }
-	  else if (unformat (line_input, "segment-baseva 0x%lx",
-			     &vcl_cfg->segment_baseva))
-	    {
-	      VDBG (0, "VCL<%d>: configured segment_baseva 0x%lx", getpid (),
-		    vcl_cfg->segment_baseva);
-	    }
-	  else if (unformat (line_input, "segment-size 0x%lx",
-			     &vcl_cfg->segment_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured segment_size 0x%lx (%ld)",
-		    getpid (), vcl_cfg->segment_size, vcl_cfg->segment_size);
-	    }
-	  else if (unformat (line_input, "segment-size %ld",
-			     &vcl_cfg->segment_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured segment_size %ld (0x%lx)",
-		    getpid (), vcl_cfg->segment_size, vcl_cfg->segment_size);
-	    }
-	  else if (unformat (line_input, "add-segment-size 0x%lx",
-			     &vcl_cfg->add_segment_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured add_segment_size 0x%lx (%ld)",
-		    getpid (), vcl_cfg->add_segment_size,
-		    vcl_cfg->add_segment_size);
-	    }
-	  else if (unformat (line_input, "add-segment-size %ld",
-			     &vcl_cfg->add_segment_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured add_segment_size %ld (0x%lx)",
-		    getpid (), vcl_cfg->add_segment_size,
-		    vcl_cfg->add_segment_size);
-	    }
-	  else if (unformat (line_input, "preallocated-fifo-pairs %d",
-			     &vcl_cfg->preallocated_fifo_pairs))
-	    {
-	      VDBG (0, "VCL<%d>: configured preallocated_fifo_pairs %d "
-		    "(0x%x)", getpid (), vcl_cfg->preallocated_fifo_pairs,
-		    vcl_cfg->preallocated_fifo_pairs);
-	    }
-	  else if (unformat (line_input, "rx-fifo-size 0x%lx",
-			     &vcl_cfg->rx_fifo_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured rx_fifo_size 0x%lx (%ld)",
-		    getpid (), vcl_cfg->rx_fifo_size, vcl_cfg->rx_fifo_size);
-	    }
-	  else if (unformat (line_input, "rx-fifo-size %ld",
-			     &vcl_cfg->rx_fifo_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured rx_fifo_size %ld (0x%lx)",
-		    getpid (), vcl_cfg->rx_fifo_size, vcl_cfg->rx_fifo_size);
-	    }
-	  else if (unformat (line_input, "tx-fifo-size 0x%lx",
-			     &vcl_cfg->tx_fifo_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured tx_fifo_size 0x%lx (%ld)",
-		    getpid (), vcl_cfg->tx_fifo_size, vcl_cfg->tx_fifo_size);
-	    }
-	  else if (unformat (line_input, "tx-fifo-size %ld",
-			     &vcl_cfg->tx_fifo_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured tx_fifo_size %ld (0x%lx)",
-		    getpid (), vcl_cfg->tx_fifo_size, vcl_cfg->tx_fifo_size);
-	    }
-	  else if (unformat (line_input, "event-queue-size 0x%lx",
-			     &vcl_cfg->event_queue_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured event_queue_size 0x%lx (%ld)",
-		    getpid (), vcl_cfg->event_queue_size,
-		    vcl_cfg->event_queue_size);
-	    }
-	  else if (unformat (line_input, "event-queue-size %ld",
-			     &vcl_cfg->event_queue_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured event_queue_size %ld (0x%lx)",
-		    getpid (), vcl_cfg->event_queue_size,
-		    vcl_cfg->event_queue_size);
-	    }
-	  else if (unformat (line_input, "listen-queue-size 0x%lx",
-			     &vcl_cfg->listen_queue_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured listen_queue_size 0x%lx (%ld)",
-		    getpid (), vcl_cfg->listen_queue_size,
-		    vcl_cfg->listen_queue_size);
-	    }
-	  else if (unformat (line_input, "listen-queue-size %ld",
-			     &vcl_cfg->listen_queue_size))
-	    {
-	      VDBG (0, "VCL<%d>: configured listen_queue_size %ld (0x%lx)",
-		    getpid (), vcl_cfg->listen_queue_size,
-		    vcl_cfg->listen_queue_size);
-	    }
-	  else if (unformat (line_input, "app-timeout %f",
-			     &vcl_cfg->app_timeout))
-	    {
-	      VDBG (0, "VCL<%d>: configured app_timeout %f",
-		    getpid (), vcl_cfg->app_timeout);
-	    }
-	  else if (unformat (line_input, "session-timeout %f",
-			     &vcl_cfg->session_timeout))
-	    {
-	      VDBG (0, "VCL<%d>: configured session_timeout %f",
-		    getpid (), vcl_cfg->session_timeout);
-	    }
-	  else if (unformat (line_input, "accept-timeout %f",
-			     &vcl_cfg->accept_timeout))
-	    {
-	      VDBG (0, "VCL<%d>: configured accept_timeout %f",
-		    getpid (), vcl_cfg->accept_timeout);
-	    }
-	  else if (unformat (line_input, "app-proxy-transport-tcp"))
-	    {
-	      vcl_cfg->app_proxy_transport_tcp = 1;
-	      VDBG (0, "VCL<%d>: configured app_proxy_transport_tcp (%d)",
-		    getpid (), vcl_cfg->app_proxy_transport_tcp);
-	    }
-	  else if (unformat (line_input, "app-proxy-transport-udp"))
-	    {
-	      vcl_cfg->app_proxy_transport_udp = 1;
-	      VDBG (0, "VCL<%d>: configured app_proxy_transport_udp (%d)",
-		    getpid (), vcl_cfg->app_proxy_transport_udp);
-	    }
-	  else if (unformat (line_input, "app-scope-local"))
-	    {
-	      vcl_cfg->app_scope_local = 1;
-	      VDBG (0, "VCL<%d>: configured app_scope_local (%d)",
-		    getpid (), vcl_cfg->app_scope_local);
-	    }
-	  else if (unformat (line_input, "app-scope-global"))
-	    {
-	      vcl_cfg->app_scope_global = 1;
-	      VDBG (0, "VCL<%d>: configured app_scope_global (%d)",
-		    getpid (), vcl_cfg->app_scope_global);
-	    }
-	  else if (unformat (line_input, "namespace-secret %lu",
-			     &vcl_cfg->namespace_secret))
-	    {
-	      VDBG (0, "VCL<%d>: configured namespace_secret %lu (0x%lx)",
-		    getpid (), vcl_cfg->namespace_secret,
-		    vcl_cfg->namespace_secret);
-	    }
-	  else if (unformat (line_input, "namespace-id %v",
-			     &vcl_cfg->namespace_id))
-	    {
-	      vl_api_application_attach_t *mp;
-	      u32 max_nsid_vec_len = sizeof (mp->namespace_id) - 1;
-	      u32 nsid_vec_len = vec_len (vcl_cfg->namespace_id);
-	      if (nsid_vec_len > max_nsid_vec_len)
-		{
-		  _vec_len (vcl_cfg->namespace_id) = max_nsid_vec_len;
-		  VDBG (0, "VCL<%d>: configured namespace_id is too long,"
-			" truncated to %d characters!",
-			getpid (), max_nsid_vec_len);
-		}
-
-	      VDBG (0, "VCL<%d>: configured namespace_id %v",
-		    getpid (), vcl_cfg->namespace_id);
-	    }
-	  else if (unformat (line_input, "}"))
-	    {
-	      vc_cfg_input = 0;
-	      VDBG (0, "VCL<%d>: completed parsing vppcom config!",
-		    getpid ());
-	      goto input_done;
-	    }
-	  else
-	    {
-	      if (line_input->buffer[line_input->index] != '#')
-		{
-		  clib_warning ("VCL<%d>: Unknown vppcom config option: '%s'",
-				getpid (), (char *)
-				&line_input->buffer[line_input->index]);
-		}
-	    }
-	}
-    }
-
-input_done:
-  unformat_free (input);
-
-file_done:
-  if (fd >= 0)
-    close (fd);
-}
-
 /*
  * VPPCOM Public API functions
  */
@@ -1827,113 +373,17 @@ vppcom_app_create (char *app_name)
 
   if (!vcm->init)
     {
-      char *conf_fname;
-      char *env_var_str;
-
       vcm->init = 1;
-      vppcom_cfg_init (vcl_cfg);
-      env_var_str = getenv (VPPCOM_ENV_DEBUG);
-      if (env_var_str)
-	{
-	  u32 tmp;
-	  if (sscanf (env_var_str, "%u", &tmp) != 1)
-	    clib_warning ("VCL<%d>: WARNING: Invalid debug level specified "
-			  "in the environment variable " VPPCOM_ENV_DEBUG
-			  " (%s)!\n", getpid (), env_var_str);
-	  else
-	    {
-	      vcm->debug = tmp;
-	      VDBG (0, "VCL<%d>: configured VCL debug level (%u) from "
-		    VPPCOM_ENV_DEBUG "!", getpid (), vcm->debug);
-	    }
-	}
-      conf_fname = getenv (VPPCOM_ENV_CONF);
-      if (!conf_fname)
-	conf_fname = VPPCOM_CONF_DEFAULT;
-      vppcom_cfg_heapsize (conf_fname);
-      vcl_cfg = &vcm->cfg;
       clib_spinlock_init (&vcm->session_fifo_lockp);
       clib_fifo_validate (vcm->client_session_index_fifo,
 			  vcm->cfg.listen_queue_size);
-      vppcom_cfg_read (conf_fname);
-
-
-      env_var_str = getenv (VPPCOM_ENV_API_PREFIX);
-      if (env_var_str)
-	{
-	  if (vcl_cfg->vpp_api_filename)
-	    vec_free (vcl_cfg->vpp_api_filename);
-	  vcl_cfg->vpp_api_filename = format (0, "/%s-vpe-api%c",
-					      env_var_str, 0);
-	  vl_set_memory_root_path ((char *) env_var_str);
-
-	  VDBG (0, "VCL<%d>: configured api prefix (%s) and filename (%s) "
-		"from " VPPCOM_ENV_API_PREFIX "!",
-		getpid (), env_var_str, vcl_cfg->vpp_api_filename);
-	}
-      env_var_str = getenv (VPPCOM_ENV_APP_NAMESPACE_ID);
-      if (env_var_str)
-	{
-	  u32 ns_id_vec_len = strlen (env_var_str);
+      clib_spinlock_init (&vcm->sessions_lockp);
 
-	  vec_reset_length (vcm->cfg.namespace_id);
-	  vec_validate (vcm->cfg.namespace_id, ns_id_vec_len - 1);
-	  clib_memcpy (vcm->cfg.namespace_id, env_var_str, ns_id_vec_len);
-
-	  VDBG (0, "VCL<%d>: configured namespace_id (%v) from "
-		VPPCOM_ENV_APP_NAMESPACE_ID "!", getpid (),
-		vcm->cfg.namespace_id);
-	}
-      env_var_str = getenv (VPPCOM_ENV_APP_NAMESPACE_SECRET);
-      if (env_var_str)
-	{
-	  u64 tmp;
-	  if (sscanf (env_var_str, "%lu", &tmp) != 1)
-	    clib_warning ("VCL<%d>: WARNING: Invalid namespace secret "
-			  "specified in the environment variable "
-			  VPPCOM_ENV_APP_NAMESPACE_SECRET
-			  " (%s)!\n", getpid (), env_var_str);
-	  else
-	    {
-	      vcm->cfg.namespace_secret = tmp;
-	      VDBG (0, "VCL<%d>: configured namespace secret (%lu) from "
-		    VPPCOM_ENV_APP_NAMESPACE_SECRET "!", getpid (),
-		    vcm->cfg.namespace_secret);
-	    }
-	}
-      if (getenv (VPPCOM_ENV_APP_PROXY_TRANSPORT_TCP))
-	{
-	  vcm->cfg.app_proxy_transport_tcp = 1;
-	  VDBG (0, "VCL<%d>: configured app_proxy_transport_tcp (%u) from "
-		VPPCOM_ENV_APP_PROXY_TRANSPORT_TCP "!", getpid (),
-		vcm->cfg.app_proxy_transport_tcp);
-	}
-      if (getenv (VPPCOM_ENV_APP_PROXY_TRANSPORT_UDP))
-	{
-	  vcm->cfg.app_proxy_transport_udp = 1;
-	  VDBG (0, "VCL<%d>: configured app_proxy_transport_udp (%u) from "
-		VPPCOM_ENV_APP_PROXY_TRANSPORT_UDP "!", getpid (),
-		vcm->cfg.app_proxy_transport_udp);
-	}
-      if (getenv (VPPCOM_ENV_APP_SCOPE_LOCAL))
-	{
-	  vcm->cfg.app_scope_local = 1;
-	  VDBG (0, "VCL<%d>: configured app_scope_local (%u) from "
-		VPPCOM_ENV_APP_SCOPE_LOCAL "!", getpid (),
-		vcm->cfg.app_scope_local);
-	}
-      if (getenv (VPPCOM_ENV_APP_SCOPE_GLOBAL))
-	{
-	  vcm->cfg.app_scope_global = 1;
-	  VDBG (0, "VCL<%d>: configured app_scope_global (%u) from "
-		VPPCOM_ENV_APP_SCOPE_GLOBAL "!", getpid (),
-		vcm->cfg.app_scope_global);
-	}
+      vppcom_cfg (&vcm->cfg);
 
       vcm->main_cpu = os_get_thread_index ();
       heap = clib_mem_get_per_cpu_heap ();
       h = mheap_header (heap);
-
       /* make the main heap thread-safe */
       h->flags |= MHEAP_FLAG_THREAD_SAFE;
 
@@ -1943,12 +393,10 @@ vppcom_app_create (char *app_name)
       vppcom_init_error_string_table ();
       svm_fifo_segment_main_init (vcl_cfg->segment_baseva,
 				  20 /* timeout in secs */ );
-      clib_spinlock_init (&vcm->sessions_lockp);
     }
 
   if (vcm->my_client_index == ~0)
     {
-
       /* API hookup and connect to VPP */
       vppcom_api_hookup ();
       vcl_elog_init (vcm);
@@ -2005,7 +453,7 @@ vppcom_app_destroy (void)
 	getpid (), vcm->my_client_index, vcm->my_client_index);
   vcl_evt (VCL_EVT_DETACH, vcm);
 
-  vppcom_app_detach ();
+  vppcom_app_send_detach ();
   orig_app_timeout = vcm->cfg.app_timeout;
   vcm->cfg.app_timeout = 2.0;
   rv = vppcom_wait_for_app_state_change (STATE_APP_ENABLED);
@@ -4311,270 +2759,6 @@ vppcom_poll (vcl_poll_t * vp, uint32_t n_sids, double wait_for_time)
 }
 
 /*
- * VPPCOM Event Functions
- */
-
-void *
-vppcom_session_io_thread_fn (void *arg)
-{
-  vppcom_session_io_thread_t *evt = (vppcom_session_io_thread_t *) arg;
-  u32 *session_indexes = 0, *session_index;
-  int i, rv;
-  u32 bytes = 0;
-  vcl_session_t *session;
-
-  while (1)
-    {
-      vec_reset_length (session_indexes);
-      VCE_IO_SESSIONS_LOCK ();
-      pool_foreach (session_index, evt->active_session_indexes, (
-								  {
-								  vec_add1
-								  (session_indexes,
-								   *session_index);
-								  }
-		    ));
-      VCE_IO_SESSIONS_UNLOCK ();
-      if (session_indexes)
-	{
-	  for (i = 0; i < vec_len (session_indexes); ++i)
-	    {
-	      VCL_SESSION_LOCK_AND_GET (session_indexes[i], &session);
-	      bytes = svm_fifo_max_dequeue (session->rx_fifo);
-	      VCL_SESSION_UNLOCK ();
-
-	      if (bytes)
-		{
-		  vppcom_ioevent_t *eio;
-		  vce_event_t *ev;
-		  u32 ev_idx;
-
-		  VCL_EVENTS_LOCK ();
-
-		  pool_get (vcm->event_thread.vce_events, ev);
-		  ev_idx = (u32) (ev - vcm->event_thread.vce_events);
-		  eio = vce_get_event_data (ev, sizeof (*eio));
-		  ev->evk.eid = VCL_EVENT_IOEVENT_RX_FIFO;
-		  ev->evk.session_index = session_indexes[i];
-		  eio->bytes = bytes;
-		  eio->session_index = session_indexes[i];
-
-		  VCL_EVENTS_UNLOCK ();
-
-		  rv = vce_generate_event (&vcm->event_thread, ev_idx);
-		}
-	    }
-	}
-      struct timespec ts;
-      ts.tv_sec = 0;
-      ts.tv_nsec = 1000000;	/* 1 millisecond */
-      nanosleep (&ts, NULL);
-    }
-done:
-  VCL_SESSION_UNLOCK ();
-  return NULL;
-}
-
-int
-vppcom_start_io_event_thread (vppcom_session_io_thread_t * evt,
-			      u8 max_sessions)
-{
-  pthread_cond_init (&(evt->vce_io_cond), NULL);
-  pthread_mutex_init (&(evt->vce_io_lock), NULL);
-
-  clib_spinlock_init (&(evt->io_sessions_lockp));
-
-  return pthread_create (&(evt->thread), NULL /* attr */ ,
-			 vppcom_session_io_thread_fn, evt);
-}
-
-void
-vce_registered_ioevent_handler_fn (void *arg)
-{
-  vce_event_handler_reg_t *reg = (vce_event_handler_reg_t *) arg;
-  vppcom_ioevent_t *eio;
-  vce_event_t *ev;
-  u32 ioevt_ndx = (u64) (reg->handler_fn_args);
-  vppcom_session_ioevent_t *ioevent, ioevent_;
-
-  VCL_EVENTS_LOCK ();
-  ev = vce_get_event_from_index (&vcm->event_thread, reg->ev_idx);
-  eio = vce_get_event_data (ev, sizeof (*eio));
-  VCL_EVENTS_UNLOCK ();
-
-  VCL_IO_SESSIONS_LOCK ();
-  ioevent = pool_elt_at_index (vcm->session_io_thread.ioevents, ioevt_ndx);
-  ioevent_ = *ioevent;
-  VCL_IO_SESSIONS_UNLOCK ();
-  (ioevent_.user_cb) (eio, ioevent_.user_cb_data);
-  vce_clear_event (&vcm->event_thread, reg->ev_idx);
-  return;
-
-  /*TODO - Unregister check in close for this listener */
-
-}
-
-void
-vce_registered_listener_connect_handler_fn (void *arg)
-{
-  vce_event_handler_reg_t *reg = (vce_event_handler_reg_t *) arg;
-  vce_event_connect_request_t *ecr;
-  vce_event_t *ev;
-  vppcom_endpt_t ep;
-
-  vcl_session_t *new_session;
-  int rv;
-
-  vppcom_session_listener_t *session_listener =
-    (vppcom_session_listener_t *) reg->handler_fn_args;
-
-  VCL_EVENTS_LOCK ();
-  ev = vce_get_event_from_index (&vcm->event_thread, reg->ev_idx);
-  ecr = vce_get_event_data (ev, sizeof (*ecr));
-  VCL_EVENTS_UNLOCK ();
-  VCL_SESSION_LOCK_AND_GET (ecr->accepted_session_index, &new_session);
-
-  ep.is_ip4 = new_session->transport.is_ip4;
-  ep.port = new_session->transport.rmt_port;
-  if (new_session->transport.is_ip4)
-    clib_memcpy (&ep.ip, &new_session->transport.rmt_ip.ip4,
-		 sizeof (ip4_address_t));
-  else
-    clib_memcpy (&ep.ip, &new_session->transport.rmt_ip.ip6,
-		 sizeof (ip6_address_t));
-
-  vppcom_send_accept_session_reply (new_session->vpp_handle,
-				    new_session->client_context,
-				    0 /* retval OK */ );
-  VCL_SESSION_UNLOCK ();
-
-  (session_listener->user_cb) (ecr->accepted_session_index, &ep,
-			       session_listener->user_cb_data);
-
-  if (vcm->session_io_thread.io_sessions_lockp)
-    {
-      /* Throw this new accepted session index into the rx poll thread pool */
-      VCL_IO_SESSIONS_LOCK ();
-      u32 *active_session_index;
-      pool_get (vcm->session_io_thread.active_session_indexes,
-		active_session_index);
-      *active_session_index = ecr->accepted_session_index;
-      VCL_IO_SESSIONS_UNLOCK ();
-    }
-
-  /*TODO - Unregister check in close for this listener */
-  return;
-
-done:
-  ASSERT (0);			// If we can't get a lock or accepted session fails, lets blow up.
-}
-
-/**
- * @brief vce_poll_wait_connect_request_handler_fn
- * - used by vppcom_epoll_xxxx() for listener sessions
- * - when a vl_api_accept_session_t_handler() generates an event
- *   this callback is alerted and sets the fields that vppcom_epoll_wait()
- *   expects to see.
- *
- * @param arg - void* to be cast to vce_event_handler_reg_t*
- */
-void
-vce_poll_wait_connect_request_handler_fn (void *arg)
-{
-  vce_event_handler_reg_t *reg = (vce_event_handler_reg_t *) arg;
-  vce_event_t *ev;
-  /* Retrieve the VCL_EVENT_CONNECT_REQ_ACCEPTED event */
-  ev = vce_get_event_from_index (&vcm->event_thread, reg->ev_idx);
-  vce_event_connect_request_t *ecr = vce_get_event_data (ev, sizeof (*ecr));
-
-  /* Add the accepted_session_index to the FIFO */
-  VCL_ACCEPT_FIFO_LOCK ();
-  clib_fifo_add1 (vcm->client_session_index_fifo,
-		  ecr->accepted_session_index);
-  VCL_ACCEPT_FIFO_UNLOCK ();
-
-  /* Recycling the event. */
-  VCL_EVENTS_LOCK ();
-  ev->recycle = 1;
-  clib_fifo_add1 (vcm->event_thread.event_index_fifo, reg->ev_idx);
-  VCL_EVENTS_UNLOCK ();
-}
-
-int
-vppcom_session_register_ioevent_cb (uint32_t session_index,
-				    vppcom_session_ioevent_cb cb,
-				    uint8_t rx, void *ptr)
-{
-  int rv = VPPCOM_OK;
-  vce_event_key_t evk;
-  vppcom_session_ioevent_t *ioevent;
-
-  if (!vcm->session_io_thread.io_sessions_lockp)
-    rv = vppcom_start_io_event_thread (&vcm->session_io_thread, 100	/* DAW_TODO: ??? hard-coded value */
-      );
-
-  if (rv == VPPCOM_OK)
-    {
-      void *io_evt_ndx;
-
-      /* Register handler for ioevent on session_index */
-      VCL_IO_SESSIONS_LOCK ();
-      pool_get (vcm->session_io_thread.ioevents, ioevent);
-      io_evt_ndx = (void *) (ioevent - vcm->session_io_thread.ioevents);
-      ioevent->user_cb = cb;
-      ioevent->user_cb_data = ptr;
-      VCL_IO_SESSIONS_UNLOCK ();
-
-      evk.session_index = session_index;
-      evk.eid = rx ? VCL_EVENT_IOEVENT_RX_FIFO : VCL_EVENT_IOEVENT_TX_FIFO;
-
-      (void) vce_register_handler (&vcm->event_thread, &evk,
-				   vce_registered_ioevent_handler_fn,
-				   io_evt_ndx);
-    }
-  return rv;
-}
-
-int
-vppcom_session_register_listener (uint32_t session_index,
-				  vppcom_session_listener_cb cb,
-				  vppcom_session_listener_errcb
-				  errcb, uint8_t flags, int q_len, void *ptr)
-{
-  int rv = VPPCOM_OK;
-  vce_event_key_t evk;
-  vppcom_session_listener_t *listener_args;
-
-  if (!vcm->session_io_thread.io_sessions_lockp)
-    rv = vppcom_start_io_event_thread (&vcm->session_io_thread, 100	/* DAW_TODO: ??? hard-coded value */
-      );
-  if (rv)
-    {
-      goto done;
-    }
-  rv = vppcom_session_listen (session_index, q_len);
-  if (rv)
-    {
-      goto done;
-    }
-
-  /* Register handler for connect_request event on listen_session_index */
-  listener_args = clib_mem_alloc (sizeof (vppcom_session_listener_t));	// DAW_TODO: Use a pool instead of thrashing the memory allocator!
-  listener_args->user_cb = cb;
-  listener_args->user_cb_data = ptr;
-  listener_args->user_errcb = errcb;
-
-  evk.session_index = session_index;
-  evk.eid = VCL_EVENT_CONNECT_REQ_ACCEPTED;
-  (void) vce_register_handler (&vcm->event_thread, &evk,
-			       vce_registered_listener_connect_handler_fn,
-			       listener_args);
-
-done:
-  return rv;
-}
-
-/*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables: