VPP-598: tcp stack initial commit

Change-Id: I49e5ce0aae6e4ff634024387ceaf7dbc432a0351
Signed-off-by: Dave Barach <dave@barachs.net>
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 821 insertions, 0 deletions

diff --git a/src/vnet/session/session_api.c b/src/vnet/session/session_api.c
new file mode 100644
index 00000000000..9d068684636
--- /dev/null
+++ b/src/vnet/session/session_api.c
@@ -0,0 +1,821 @@
+/*
+ * Copyright (c) 2015-2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+#include <vlibmemory/api.h>
+#include <vnet/session/application.h>
+
+#include <vnet/vnet_msg_enum.h>
+#include "application_interface.h"
+
+#define vl_typedefs		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <vnet/vnet_all_api_h.h>
+#undef vl_printfun
+
+#include <vlibapi/api_helper_macros.h>
+
+#define foreach_session_api_msg                                         \
+_(MAP_ANOTHER_SEGMENT_REPLY, map_another_segment_reply)                 \
+_(BIND_URI, bind_uri)                                                   \
+_(UNBIND_URI, unbind_uri)                                               \
+_(CONNECT_URI, connect_uri)                                             \
+_(DISCONNECT_SESSION, disconnect_session)                               \
+_(DISCONNECT_SESSION_REPLY, disconnect_session_reply)                   \
+_(ACCEPT_SESSION_REPLY, accept_session_reply)                           \
+_(RESET_SESSION_REPLY, reset_session_reply)                   		\
+_(BIND_SOCK, bind_sock) 		                                \
+_(UNBIND_SOCK, unbind_sock)                                             \
+_(CONNECT_SOCK, connect_sock)                                          	\
+_(DISCONNECT_SOCK, disconnect_sock)                               	\
+_(DISCONNECT_SOCK_REPLY, disconnect_sock_reply)                        	\
+_(ACCEPT_SOCK_REPLY, accept_sock_reply)                           	\
+_(RESET_SOCK_REPLY, reset_sock_reply)                   		\
+
+static int
+send_add_segment_callback (u32 api_client_index, const u8 * segment_name,
+			   u32 segment_size)
+{
+  vl_api_map_another_segment_t *mp;
+  unix_shared_memory_queue_t *q;
+
+  q = vl_api_client_index_to_input_queue (api_client_index);
+
+  if (!q)
+    return -1;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_MAP_ANOTHER_SEGMENT);
+  mp->segment_size = segment_size;
+  strncpy ((char *) mp->segment_name, (char *) segment_name,
+	   sizeof (mp->segment_name) - 1);
+
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+
+  return 0;
+}
+
+static int
+send_session_accept_uri_callback (stream_session_t * s)
+{
+  vl_api_accept_session_t *mp;
+  unix_shared_memory_queue_t *q, *vpp_queue;
+  application_t *server = application_get (s->app_index);
+
+  q = vl_api_client_index_to_input_queue (server->api_client_index);
+  vpp_queue = session_manager_get_vpp_event_queue (s->thread_index);
+
+  if (!q)
+    return -1;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_ACCEPT_SESSION);
+
+  /* Note: session_type is the first octet in all types of sessions */
+
+  mp->accept_cookie = server->accept_cookie;
+  mp->server_rx_fifo = (u64) s->server_rx_fifo;
+  mp->server_tx_fifo = (u64) s->server_tx_fifo;
+  mp->session_thread_index = s->thread_index;
+  mp->session_index = s->session_index;
+  mp->session_type = s->session_type;
+  mp->vpp_event_queue_address = (u64) vpp_queue;
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+
+  return 0;
+}
+
+static void
+send_session_disconnect_uri_callback (stream_session_t * s)
+{
+  vl_api_disconnect_session_t *mp;
+  unix_shared_memory_queue_t *q;
+  application_t *app = application_get (s->app_index);
+
+  q = vl_api_client_index_to_input_queue (app->api_client_index);
+
+  if (!q)
+    return;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_DISCONNECT_SESSION);
+
+  mp->session_thread_index = s->thread_index;
+  mp->session_index = s->session_index;
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+}
+
+static int
+send_session_connected_uri_callback (u32 api_client_index,
+				     stream_session_t * s, u8 is_fail)
+{
+  vl_api_connect_uri_reply_t *mp;
+  unix_shared_memory_queue_t *q;
+  application_t *app = application_lookup (api_client_index);
+  u8 *seg_name;
+  unix_shared_memory_queue_t *vpp_queue;
+
+  q = vl_api_client_index_to_input_queue (app->api_client_index);
+
+  if (!q)
+    return -1;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_CONNECT_URI_REPLY);
+  mp->context = app->api_context;
+  mp->retval = is_fail;
+  if (!is_fail)
+    {
+      vpp_queue = session_manager_get_vpp_event_queue (s->thread_index);
+      mp->server_rx_fifo = (u64) s->server_rx_fifo;
+      mp->server_tx_fifo = (u64) s->server_tx_fifo;
+      mp->session_thread_index = s->thread_index;
+      mp->session_index = s->session_index;
+      mp->session_type = s->session_type;
+      mp->vpp_event_queue_address = (u64) vpp_queue;
+      mp->client_event_queue_address = (u64) app->event_queue;
+
+      session_manager_get_segment_info (s->server_segment_index, &seg_name,
+					&mp->segment_size);
+      mp->segment_name_length = vec_len (seg_name);
+      if (mp->segment_name_length)
+	clib_memcpy (mp->segment_name, seg_name, mp->segment_name_length);
+    }
+
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+
+  /* Remove client if connect failed */
+  if (is_fail)
+    application_del (app);
+
+  return 0;
+}
+
+/**
+ * Redirect a connect_uri message to the indicated server.
+ * Only sent if the server has bound the related port with
+ * URI_OPTIONS_FLAGS_USE_FIFO
+ */
+static int
+redirect_connect_uri_callback (u32 server_api_client_index, void *mp_arg)
+{
+  vl_api_connect_uri_t *mp = mp_arg;
+  unix_shared_memory_queue_t *server_q, *client_q;
+  vlib_main_t *vm = vlib_get_main ();
+  f64 timeout = vlib_time_now (vm) + 0.5;
+  int rv = 0;
+
+  server_q = vl_api_client_index_to_input_queue (server_api_client_index);
+
+  if (!server_q)
+    {
+      rv = VNET_API_ERROR_INVALID_VALUE;
+      goto out;
+    }
+
+  client_q = vl_api_client_index_to_input_queue (mp->client_index);
+  if (!client_q)
+    {
+      rv = VNET_API_ERROR_INVALID_VALUE_2;
+      goto out;
+    }
+
+  /* Tell the server the client's API queue address, so it can reply */
+  mp->client_queue_address = (u64) client_q;
+
+  /*
+   * Bounce message handlers MUST NOT block the data-plane.
+   * Spin waiting for the queue lock, but
+   */
+
+  while (vlib_time_now (vm) < timeout)
+    {
+      rv =
+	unix_shared_memory_queue_add (server_q, (u8 *) & mp, 1 /*nowait */ );
+      switch (rv)
+	{
+	  /* correctly enqueued */
+	case 0:
+	  return VNET_CONNECT_REDIRECTED;
+
+	  /* continue spinning, wait for pthread_mutex_trylock to work */
+	case -1:
+	  continue;
+
+	  /* queue stuffed, drop the msg */
+	case -2:
+	  rv = VNET_API_ERROR_QUEUE_FULL;
+	  goto out;
+	}
+    }
+out:
+  /* Dispose of the message */
+  vl_msg_api_free (mp);
+  return rv;
+}
+
+static u64
+make_session_handle (stream_session_t * s)
+{
+  return (u64) s->session_index << 32 | (u64) s->thread_index;
+}
+
+static int
+send_session_accept_callback (stream_session_t * s)
+{
+  vl_api_accept_sock_t *mp;
+  unix_shared_memory_queue_t *q, *vpp_queue;
+  application_t *server = application_get (s->app_index);
+
+  q = vl_api_client_index_to_input_queue (server->api_client_index);
+  vpp_queue = session_manager_get_vpp_event_queue (s->thread_index);
+
+  if (!q)
+    return -1;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_ACCEPT_SOCK);
+
+  /* Note: session_type is the first octet in all types of sessions */
+
+  mp->accept_cookie = server->accept_cookie;
+  mp->server_rx_fifo = (u64) s->server_rx_fifo;
+  mp->server_tx_fifo = (u64) s->server_tx_fifo;
+  mp->handle = make_session_handle (s);
+  mp->vpp_event_queue_address = (u64) vpp_queue;
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+
+  return 0;
+}
+
+static int
+send_session_connected_callback (u32 api_client_index, stream_session_t * s,
+				 u8 is_fail)
+{
+  vl_api_connect_sock_reply_t *mp;
+  unix_shared_memory_queue_t *q;
+  application_t *app = application_lookup (api_client_index);
+  u8 *seg_name;
+  unix_shared_memory_queue_t *vpp_queue;
+
+  q = vl_api_client_index_to_input_queue (app->api_client_index);
+
+  if (!q)
+    return -1;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_CONNECT_SOCK_REPLY);
+  mp->context = app->api_context;
+  mp->retval = is_fail;
+  if (!is_fail)
+    {
+      vpp_queue = session_manager_get_vpp_event_queue (s->thread_index);
+      mp->server_rx_fifo = (u64) s->server_rx_fifo;
+      mp->server_tx_fifo = (u64) s->server_tx_fifo;
+      mp->handle = make_session_handle (s);
+      mp->vpp_event_queue_address = (u64) vpp_queue;
+      mp->client_event_queue_address = (u64) app->event_queue;
+
+      session_manager_get_segment_info (s->server_segment_index, &seg_name,
+					&mp->segment_size);
+      mp->segment_name_length = vec_len (seg_name);
+      if (mp->segment_name_length)
+	clib_memcpy (mp->segment_name, seg_name, mp->segment_name_length);
+    }
+
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+
+  /* Remove client if connect failed */
+  if (is_fail)
+    application_del (app);
+
+  return 0;
+}
+
+static void
+send_session_disconnect_callback (stream_session_t * s)
+{
+  vl_api_disconnect_sock_t *mp;
+  unix_shared_memory_queue_t *q;
+  application_t *app = application_get (s->app_index);
+
+  q = vl_api_client_index_to_input_queue (app->api_client_index);
+
+  if (!q)
+    return;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_DISCONNECT_SOCK);
+
+  mp->handle = make_session_handle (s);
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+}
+
+/**
+ * Redirect a connect_uri message to the indicated server.
+ * Only sent if the server has bound the related port with
+ * URI_OPTIONS_FLAGS_USE_FIFO
+ */
+static int
+redirect_connect_callback (u32 server_api_client_index, void *mp_arg)
+{
+  vl_api_connect_sock_t *mp = mp_arg;
+  unix_shared_memory_queue_t *server_q, *client_q;
+  vlib_main_t *vm = vlib_get_main ();
+  f64 timeout = vlib_time_now (vm) + 0.5;
+  int rv = 0;
+
+  server_q = vl_api_client_index_to_input_queue (server_api_client_index);
+
+  if (!server_q)
+    {
+      rv = VNET_API_ERROR_INVALID_VALUE;
+      goto out;
+    }
+
+  client_q = vl_api_client_index_to_input_queue (mp->client_index);
+  if (!client_q)
+    {
+      rv = VNET_API_ERROR_INVALID_VALUE_2;
+      goto out;
+    }
+
+  /* Tell the server the client's API queue address, so it can reply */
+  mp->client_queue_address = (u64) client_q;
+
+  /*
+   * Bounce message handlers MUST NOT block the data-plane.
+   * Spin waiting for the queue lock, but
+   */
+
+  while (vlib_time_now (vm) < timeout)
+    {
+      rv =
+	unix_shared_memory_queue_add (server_q, (u8 *) & mp, 1 /*nowait */ );
+      switch (rv)
+	{
+	  /* correctly enqueued */
+	case 0:
+	  return VNET_CONNECT_REDIRECTED;
+
+	  /* continue spinning, wait for pthread_mutex_trylock to work */
+	case -1:
+	  continue;
+
+	  /* queue stuffed, drop the msg */
+	case -2:
+	  rv = VNET_API_ERROR_QUEUE_FULL;
+	  goto out;
+	}
+    }
+out:
+  /* Dispose of the message */
+  vl_msg_api_free (mp);
+  return rv;
+}
+
+static session_cb_vft_t uri_session_cb_vft = {
+  .session_accept_callback = send_session_accept_uri_callback,
+  .session_disconnect_callback = send_session_disconnect_uri_callback,
+  .session_connected_callback = send_session_connected_uri_callback,
+  .add_segment_callback = send_add_segment_callback,
+  .redirect_connect_callback = redirect_connect_uri_callback
+};
+
+static session_cb_vft_t session_cb_vft = {
+  .session_accept_callback = send_session_accept_callback,
+  .session_disconnect_callback = send_session_disconnect_callback,
+  .session_connected_callback = send_session_connected_callback,
+  .add_segment_callback = send_add_segment_callback,
+  .redirect_connect_callback = redirect_connect_callback
+};
+
+static int
+api_session_not_valid (u32 session_index, u32 thread_index)
+{
+  session_manager_main_t *smm = vnet_get_session_manager_main ();
+  stream_session_t *pool;
+
+  if (thread_index >= vec_len (smm->sessions))
+    return VNET_API_ERROR_INVALID_VALUE;
+
+  pool = smm->sessions[thread_index];
+
+  if (pool_is_free_index (pool, session_index))
+    return VNET_API_ERROR_INVALID_VALUE_2;
+
+  return 0;
+}
+
+static void
+vl_api_bind_uri_t_handler (vl_api_bind_uri_t * mp)
+{
+  vl_api_bind_uri_reply_t *rmp;
+  vnet_bind_args_t _a, *a = &_a;
+  char segment_name[128];
+  u32 segment_name_length;
+  int rv;
+
+  _Static_assert (sizeof (u64) * SESSION_OPTIONS_N_OPTIONS <=
+		  sizeof (mp->options),
+		  "Out of options, fix api message definition");
+
+  segment_name_length = ARRAY_LEN (segment_name);
+
+  memset (a, 0, sizeof (*a));
+
+  a->uri = (char *) mp->uri;
+  a->api_client_index = mp->client_index;
+  a->options = mp->options;
+  a->segment_name = segment_name;
+  a->segment_name_length = segment_name_length;
+  a->session_cb_vft = &uri_session_cb_vft;
+
+  a->options[SESSION_OPTIONS_SEGMENT_SIZE] = mp->initial_segment_size;
+  a->options[SESSION_OPTIONS_ACCEPT_COOKIE] = mp->accept_cookie;
+  rv = vnet_bind_uri (a);
+
+  /* *INDENT-OFF* */
+  REPLY_MACRO2 (VL_API_BIND_URI_REPLY, ({
+    rmp->retval = rv;
+    if (!rv)
+      {
+	rmp->segment_name_length = 0;
+	/* $$$$ policy? */
+	rmp->segment_size = mp->initial_segment_size;
+	if (segment_name_length)
+	  {
+	    memcpy (rmp->segment_name, segment_name, segment_name_length);
+	    rmp->segment_name_length = segment_name_length;
+	  }
+	rmp->server_event_queue_address = a->server_event_queue_address;
+      }
+  }));
+  /* *INDENT-ON* */
+
+}
+
+static void
+vl_api_unbind_uri_t_handler (vl_api_unbind_uri_t * mp)
+{
+  vl_api_unbind_uri_reply_t *rmp;
+  int rv;
+
+  rv = vnet_unbind_uri ((char *) mp->uri, mp->client_index);
+
+  REPLY_MACRO (VL_API_UNBIND_URI_REPLY);
+}
+
+static void
+vl_api_connect_uri_t_handler (vl_api_connect_uri_t * mp)
+{
+  vnet_connect_args_t _a, *a = &_a;
+
+  a->uri = (char *) mp->uri;
+  a->api_client_index = mp->client_index;
+  a->api_context = mp->context;
+  a->options = mp->options;
+  a->session_cb_vft = &uri_session_cb_vft;
+  a->mp = mp;
+  vnet_connect_uri (a);
+}
+
+static void
+vl_api_disconnect_session_t_handler (vl_api_disconnect_session_t * mp)
+{
+  vl_api_disconnect_session_reply_t *rmp;
+  int rv;
+
+  rv = api_session_not_valid (mp->session_index, mp->session_thread_index);
+  if (!rv)
+    rv = vnet_disconnect_session (mp->client_index, mp->session_index,
+				  mp->session_thread_index);
+
+  REPLY_MACRO (VL_API_DISCONNECT_SESSION_REPLY);
+}
+
+static void
+vl_api_disconnect_session_reply_t_handler (vl_api_disconnect_session_reply_t *
+					   mp)
+{
+  if (api_session_not_valid (mp->session_index, mp->session_thread_index))
+    {
+      clib_warning ("Invalid session!");
+      return;
+    }
+
+  /* Client objected to disconnecting the session, log and continue */
+  if (mp->retval)
+    {
+      clib_warning ("client retval %d", mp->retval);
+      return;
+    }
+
+  /* Disconnect has been confirmed. Confirm close to transport */
+  vnet_disconnect_session (mp->client_index, mp->session_index,
+			   mp->session_thread_index);
+}
+
+static void
+vl_api_reset_session_reply_t_handler (vl_api_reset_session_reply_t * mp)
+{
+  stream_session_t *s;
+
+  if (api_session_not_valid (mp->session_index, mp->session_thread_index))
+    {
+      clib_warning ("Invalid session!");
+      return;
+    }
+
+  /* Client objected to resetting the session, log and continue */
+  if (mp->retval)
+    {
+      clib_warning ("client retval %d", mp->retval);
+      return;
+    }
+
+  s = stream_session_get (mp->session_index, mp->session_thread_index);
+
+  /* This comes as a response to a reset, transport only waiting for
+   * confirmation to remove connection state, no need to disconnect */
+  stream_session_cleanup (s);
+}
+
+static void
+vl_api_accept_session_reply_t_handler (vl_api_accept_session_reply_t * mp)
+{
+  stream_session_t *s;
+  int rv;
+
+  if (api_session_not_valid (mp->session_index, mp->session_thread_index))
+    return;
+
+  s = stream_session_get (mp->session_index, mp->session_thread_index);
+  rv = mp->retval;
+
+  if (rv)
+    {
+      /* Server isn't interested, kill the session */
+      stream_session_disconnect (s);
+      return;
+    }
+
+  s->session_state = SESSION_STATE_READY;
+}
+
+static void
+vl_api_map_another_segment_reply_t_handler (vl_api_map_another_segment_reply_t
+					    * mp)
+{
+  clib_warning ("not implemented");
+}
+
+static void
+vl_api_bind_sock_t_handler (vl_api_bind_sock_t * mp)
+{
+  vl_api_bind_sock_reply_t *rmp;
+  vnet_bind_args_t _a, *a = &_a;
+  char segment_name[128];
+  u32 segment_name_length;
+  int rv;
+
+  STATIC_ASSERT (sizeof (u64) * SESSION_OPTIONS_N_OPTIONS <=
+		 sizeof (mp->options),
+		 "Out of options, fix api message definition");
+
+  segment_name_length = ARRAY_LEN (segment_name);
+
+  memset (a, 0, sizeof (*a));
+
+  clib_memcpy (&a->tep.ip, mp->ip,
+	       (mp->is_ip4 ? sizeof (ip4_address_t) :
+		sizeof (ip6_address_t)));
+  a->tep.is_ip4 = mp->is_ip4;
+  a->tep.port = mp->port;
+  a->tep.vrf = mp->vrf;
+
+  a->api_client_index = mp->client_index;
+  a->options = mp->options;
+  a->segment_name = segment_name;
+  a->segment_name_length = segment_name_length;
+  a->session_cb_vft = &session_cb_vft;
+
+  rv = vnet_bind_uri (a);
+
+  /* *INDENT-OFF* */
+  REPLY_MACRO2 (VL_API_BIND_SOCK_REPLY, ({
+    rmp->retval = rv;
+    if (!rv)
+      {
+	rmp->segment_name_length = 0;
+	rmp->segment_size = mp->options[SESSION_OPTIONS_SEGMENT_SIZE];
+	if (segment_name_length)
+	  {
+	    memcpy(rmp->segment_name, segment_name, segment_name_length);
+	    rmp->segment_name_length = segment_name_length;
+	  }
+	rmp->server_event_queue_address = a->server_event_queue_address;
+      }
+  }));
+  /* *INDENT-ON* */
+}
+
+static void
+vl_api_unbind_sock_t_handler (vl_api_unbind_sock_t * mp)
+{
+  vl_api_unbind_sock_reply_t *rmp;
+  vnet_unbind_args_t _a, *a = &_a;
+  int rv;
+
+  a->api_client_index = mp->client_index;
+  a->handle = mp->handle;
+
+  rv = vnet_unbind (a);
+
+  REPLY_MACRO (VL_API_UNBIND_SOCK_REPLY);
+}
+
+static void
+vl_api_connect_sock_t_handler (vl_api_connect_sock_t * mp)
+{
+  vnet_connect_args_t _a, *a = &_a;
+
+  clib_memcpy (&a->tep.ip, mp->ip,
+	       (mp->is_ip4 ? sizeof (ip4_address_t) :
+		sizeof (ip6_address_t)));
+  a->tep.is_ip4 = mp->is_ip4;
+  a->tep.port = mp->port;
+  a->tep.vrf = mp->vrf;
+  a->options = mp->options;
+  a->session_cb_vft = &session_cb_vft;
+  a->api_context = mp->context;
+  a->mp = mp;
+
+  vnet_connect (a);
+}
+
+static void
+vl_api_disconnect_sock_t_handler (vl_api_disconnect_sock_t * mp)
+{
+  vnet_disconnect_args_t _a, *a = &_a;
+  vl_api_disconnect_sock_reply_t *rmp;
+  int rv;
+
+  a->api_client_index = mp->client_index;
+  a->handle = mp->handle;
+  rv = vnet_disconnect (a);
+
+  REPLY_MACRO (VL_API_DISCONNECT_SOCK_REPLY);
+}
+
+static void
+vl_api_disconnect_sock_reply_t_handler (vl_api_disconnect_sock_reply_t * mp)
+{
+  vnet_disconnect_args_t _a, *a = &_a;
+
+  /* Client objected to disconnecting the session, log and continue */
+  if (mp->retval)
+    {
+      clib_warning ("client retval %d", mp->retval);
+      return;
+    }
+
+  a->api_client_index = mp->client_index;
+  a->handle = mp->handle;
+
+  vnet_disconnect (a);
+}
+
+static void
+vl_api_reset_sock_reply_t_handler (vl_api_reset_sock_reply_t * mp)
+{
+  stream_session_t *s;
+  u32 session_index, thread_index;
+
+  /* Client objected to resetting the session, log and continue */
+  if (mp->retval)
+    {
+      clib_warning ("client retval %d", mp->retval);
+      return;
+    }
+
+  if (api_parse_session_handle (mp->handle, &session_index, &thread_index))
+    {
+      clib_warning ("Invalid handle");
+      return;
+    }
+
+  s = stream_session_get (session_index, thread_index);
+
+  /* This comes as a response to a reset, transport only waiting for
+   * confirmation to remove connection state, no need to disconnect */
+  stream_session_cleanup (s);
+}
+
+static void
+vl_api_accept_sock_reply_t_handler (vl_api_accept_sock_reply_t * mp)
+{
+  stream_session_t *s;
+  u32 session_index, thread_index;
+
+  if (api_parse_session_handle (mp->handle, &session_index, &thread_index))
+    {
+      clib_warning ("Invalid handle");
+      return;
+    }
+  s = stream_session_get (session_index, thread_index);
+
+  if (mp->retval)
+    {
+      /* Server isn't interested, kill the session */
+      stream_session_disconnect (s);
+      return;
+    }
+
+  s->session_state = SESSION_STATE_READY;
+}
+
+#define vl_msg_name_crc_list
+#include <vnet/vnet_all_api_h.h>
+#undef vl_msg_name_crc_list
+
+static void
+setup_message_id_table (api_main_t * am)
+{
+#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id);
+  foreach_vl_msg_name_crc_session;
+#undef _
+}
+
+/*
+ * session_api_hookup
+ * Add uri's API message handlers to the table.
+ * vlib has alread mapped shared memory and
+ * added the client registration handlers.
+ * See .../open-repo/vlib/memclnt_vlib.c:memclnt_process()
+ */
+static clib_error_t *
+session_api_hookup (vlib_main_t * vm)
+{
+  api_main_t *am = &api_main;
+
+#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_session_api_msg;
+#undef _
+
+  /*
+   * Messages which bounce off the data-plane to
+   * an API client. Simply tells the message handling infra not
+   * to free the message.
+   *
+   * Bounced message handlers MUST NOT block the data plane
+   */
+  am->message_bounce[VL_API_CONNECT_URI] = 1;
+  am->message_bounce[VL_API_CONNECT_SOCK] = 1;
+
+  /*
+   * Set up the (msg_name, crc, message-id) table
+   */
+  setup_message_id_table (am);
+
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (session_api_hookup);
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */