X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fsession%2Fapplication_interface.h;h=be6c74c6529d0d120d8772bfc4691102631a1236;hb=4ac258497;hp=a5f2b9a6a1a9dbdbd8667d9548ac9d04ac3eef2a;hpb=d79b41e993981df80245b0e6d90eb691bdaae648;p=vpp.git

diff --git a/src/vnet/session/application_interface.h b/src/vnet/session/application_interface.h
index a5f2b9a6a1a..be6c74c6529 100644
--- a/src/vnet/session/application_interface.h
+++ b/src/vnet/session/application_interface.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Copyright (c) 2016-2019 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:
@@ -15,34 +15,101 @@
 #ifndef __included_uri_h__
 #define __included_uri_h__
 
-#include <vlib/vlib.h>
-#include <vnet/vnet.h>
-#include <svm/svm_fifo_segment.h>
-#include <vnet/session/session.h>
-#include <vnet/session/application.h>
-#include <vnet/session/transport.h>
+#include <vlibmemory/api.h>
+#include <svm/message_queue.h>
+#include <vnet/session/session_types.h>
+#include <vnet/tls/tls_test.h>
+#include <svm/fifo_segment.h>
 
-typedef enum _session_api_proto
+typedef struct certificate_
 {
-  SESSION_PROTO_TCP,
-  SESSION_PROTO_UDP
-} session_api_proto_t;
+  u32 *app_interests;		/* vec of application index asking for deletion cb */
+  u32 cert_key_index;		/* index in cert & key pool */
+  u8 *key;
+  u8 *cert;
+} app_cert_key_pair_t;
+
+typedef struct session_cb_vft_
+{
+  /** Notify server of new segment */
+  int (*add_segment_callback) (u32 app_wrk_index, u64 segment_handle);
+
+  /** Notify server of new segment */
+  int (*del_segment_callback) (u32 app_wrk_index, u64 segment_handle);
+
+  /** Notify server of newly accepted session */
+  int (*session_accept_callback) (session_t * new_session);
+
+  /** Connection request callback */
+  int (*session_connected_callback) (u32 app_wrk_index, u32 opaque,
+				     session_t * s, session_error_t code);
+
+  /** Notify app that session is closing */
+  void (*session_disconnect_callback) (session_t * s);
+
+  /** Notify app that transport is closed */
+  void (*session_transport_closed_callback) (session_t * s);
+
+  /** Notify app that session or transport are about to be removed */
+  void (*session_cleanup_callback) (session_t * s, session_cleanup_ntf_t ntf);
+
+  /** Notify app that session was reset */
+  void (*session_reset_callback) (session_t * s);
+
+  /** Notify app that session pool migration happened */
+  void (*session_migrate_callback) (session_t * s, session_handle_t new_sh);
+
+  /** Direct RX callback for built-in application */
+  int (*builtin_app_rx_callback) (session_t * session);
+
+  /** Direct TX callback for built-in application */
+  int (*builtin_app_tx_callback) (session_t * session);
+
+  /** Cert and key pair delete notification */
+  int (*app_cert_key_pair_delete_callback) (app_cert_key_pair_t * ckpair);
+
+  /** Delegate fifo-tuning-logic to application */
+  int (*fifo_tuning_callback) (session_t * s, svm_fifo_t * f,
+			       session_ft_action_t act, u32 bytes);
+
+} session_cb_vft_t;
+
+#define foreach_app_init_args			\
+  _(u32, api_client_index)			\
+  _(u8 *, name)					\
+  _(u64 *, options)				\
+  _(u8 *, namespace_id)				\
+  _(session_cb_vft_t *, session_cb_vft)		\
+  _(u32, app_index)				\
+  _(u8, use_sock_api)				\
+
+typedef struct _vnet_app_attach_args_t
+{
+#define _(_type, _name) _type _name;
+  foreach_app_init_args
+#undef _
+  ssvm_private_t * segment;
+  svm_msg_q_t *app_evt_q;
+  u64 segment_handle;
+} vnet_app_attach_args_t;
+
+typedef struct _vnet_app_detach_args_t
+{
+  u32 app_index;
+  u32 api_client_index;
+} vnet_app_detach_args_t;
 
 typedef struct _vnet_bind_args_t
 {
   union
   {
+    session_endpoint_cfg_t sep_ext;
+    session_endpoint_t sep;
     char *uri;
-    struct
-    {
-      transport_endpoint_t tep;
-      session_api_proto_t proto;
-    };
   };
 
-  u32 api_client_index;
-  u64 *options;
-  session_cb_vft_t *session_cb_vft;
+  u32 app_index;
+  u32 wrk_map_index;
 
   /*
    * Results
@@ -51,77 +118,757 @@ typedef struct _vnet_bind_args_t
   u32 segment_name_length;
   u64 server_event_queue_address;
   u64 handle;
-} vnet_bind_args_t;
+} vnet_listen_args_t;
 
-typedef struct _vnet_unbind_args_t
+typedef struct _vnet_unlisten_args_t
 {
   union
   {
     char *uri;
-    u64 handle;
+    u64 handle;			/**< Session handle */
   };
-  u32 api_client_index;
-} vnet_unbind_args_t;
+  u32 app_index;		/**< Owning application index */
+  u32 wrk_map_index;		/**< App's local pool worker index */
+} vnet_unlisten_args_t;
 
 typedef struct _vnet_connect_args
 {
   union
   {
+    session_endpoint_cfg_t sep_ext;
+    session_endpoint_t sep;
     char *uri;
-    struct
-    {
-      transport_endpoint_t tep;
-      session_api_proto_t proto;
-    };
   };
-  u32 api_client_index;
+  u32 app_index;
+  u32 wrk_map_index;
   u32 api_context;
-  u64 *options;
-  session_cb_vft_t *session_cb_vft;
 
-  /* Used for redirects */
-  void *mp;
+  session_handle_t session_handle;
 } vnet_connect_args_t;
 
 typedef struct _vnet_disconnect_args_t
 {
-  u64 handle;
-  u32 api_client_index;
+  session_handle_t handle;
+  u32 app_index;
 } vnet_disconnect_args_t;
 
-/* Bind / connect options */
+typedef struct _vnet_application_add_tls_cert_args_t
+{
+  u32 app_index;
+  u8 *cert;
+} vnet_app_add_tls_cert_args_t;
+
+typedef struct _vnet_application_add_tls_key_args_t
+{
+  u32 app_index;
+  u8 *key;
+} vnet_app_add_tls_key_args_t;
+
+typedef enum crypto_engine_type_
+{
+  CRYPTO_ENGINE_NONE,
+  CRYPTO_ENGINE_OPENSSL,
+  CRYPTO_ENGINE_MBEDTLS,
+  CRYPTO_ENGINE_VPP,
+  CRYPTO_ENGINE_PICOTLS,
+  CRYPTO_ENGINE_LAST = CRYPTO_ENGINE_PICOTLS,
+} crypto_engine_type_t;
+
+typedef struct _vnet_app_add_cert_key_pair_args_
+{
+  u8 *cert;
+  u8 *key;
+  u32 cert_len;
+  u32 key_len;
+  u32 index;
+} vnet_app_add_cert_key_pair_args_t;
+
+typedef struct crypto_ctx_
+{
+  u32 ctx_index;		/**< index in crypto context pool */
+  u32 n_subscribers;		/**< refcount of sessions using said context */
+  u32 ckpair_index;		/**< certificate & key */
+  u8 crypto_engine;
+  void *data;			/**< protocol specific data */
+} crypto_context_t;
+
+/* Application attach options */
 typedef enum
 {
-  SESSION_OPTIONS_FLAGS,
-  SESSION_OPTIONS_SEGMENT_SIZE,
-  SESSION_OPTIONS_ADD_SEGMENT_SIZE,
-  SESSION_OPTIONS_RX_FIFO_SIZE,
-  SESSION_OPTIONS_TX_FIFO_SIZE,
-  SESSION_OPTIONS_ACCEPT_COOKIE,
-  SESSION_OPTIONS_N_OPTIONS
-} session_options_index_t;
+  APP_OPTIONS_FLAGS,
+  APP_OPTIONS_EVT_QUEUE_SIZE,
+  APP_OPTIONS_SEGMENT_SIZE,
+  APP_OPTIONS_ADD_SEGMENT_SIZE,
+  APP_OPTIONS_PRIVATE_SEGMENT_COUNT,
+  APP_OPTIONS_RX_FIFO_SIZE,
+  APP_OPTIONS_TX_FIFO_SIZE,
+  APP_OPTIONS_PREALLOC_FIFO_PAIRS,
+  APP_OPTIONS_PREALLOC_FIFO_HDRS,
+  APP_OPTIONS_NAMESPACE,
+  APP_OPTIONS_NAMESPACE_SECRET,
+  APP_OPTIONS_PROXY_TRANSPORT,
+  APP_OPTIONS_ACCEPT_COOKIE,
+  APP_OPTIONS_TLS_ENGINE,
+  APP_OPTIONS_MAX_FIFO_SIZE,
+  APP_OPTIONS_HIGH_WATERMARK,
+  APP_OPTIONS_LOW_WATERMARK,
+  APP_OPTIONS_PCT_FIRST_ALLOC,
+  APP_OPTIONS_N_OPTIONS
+} app_attach_options_index_t;
+
+#define foreach_app_options_flags				\
+  _(ACCEPT_REDIRECT, "Use FIFO with redirects")			\
+  _(ADD_SEGMENT, "Add segment and signal app if needed")	\
+  _(IS_BUILTIN, "Application is builtin")			\
+  _(IS_TRANSPORT_APP, "Application is a transport proto")	\
+  _(IS_PROXY, "Application is proxying")			\
+  _(USE_GLOBAL_SCOPE, "App can use global session scope")	\
+  _(USE_LOCAL_SCOPE, "App can use local session scope")		\
+  _(EVT_MQ_USE_EVENTFD, "Use eventfds for signaling")		\
+
+typedef enum _app_options
+{
+#define _(sym, str) APP_OPTIONS_##sym,
+  foreach_app_options_flags
+#undef _
+} app_options_t;
+
+typedef enum _app_options_flags
+{
+#define _(sym, str) APP_OPTIONS_FLAGS_##sym = 1 << APP_OPTIONS_##sym,
+  foreach_app_options_flags
+#undef _
+} app_options_flags_t;
 
-/** Server can handle delegated connect requests from local clients */
-#define SESSION_OPTIONS_FLAGS_USE_FIFO	(1<<0)
+#define foreach_fd_type						\
+  _(VPP_MQ_SEGMENT, "Fd for vpp's event mq segment")		\
+  _(MEMFD_SEGMENT, "Fd for memfd segment")			\
+  _(MQ_EVENTFD, "Event fd used by message queue")		\
+  _(VPP_MQ_EVENTFD, "Event fd used by vpp's message queue")	\
 
-/** Server wants vpp to add segments when out of memory for fifos */
-#define SESSION_OPTIONS_FLAGS_ADD_SEGMENT   (1<<1)
+typedef enum session_fd_type_
+{
+#define _(sym, str) SESSION_FD_##sym,
+  foreach_fd_type
+#undef _
+  SESSION_N_FD_TYPE
+} session_fd_type_t;
 
-#define VNET_CONNECT_REDIRECTED	123
+typedef enum session_fd_flag_
+{
+#define _(sym, str) SESSION_FD_F_##sym = 1 << SESSION_FD_##sym,
+  foreach_fd_type
+#undef _
+} session_fd_flag_t;
 
-int vnet_bind_uri (vnet_bind_args_t *);
-int vnet_unbind_uri (char *uri, u32 api_client_index);
+int parse_uri (char *uri, session_endpoint_cfg_t * sep);
+int vnet_bind_uri (vnet_listen_args_t *);
+int vnet_unbind_uri (vnet_unlisten_args_t * a);
 int vnet_connect_uri (vnet_connect_args_t * a);
-int vnet_disconnect_session (u32 session_index, u32 thread_index);
 
-int vnet_bind (vnet_bind_args_t * a);
+int vnet_application_attach (vnet_app_attach_args_t * a);
+int vnet_application_detach (vnet_app_detach_args_t * a);
+int vnet_listen (vnet_listen_args_t * a);
 int vnet_connect (vnet_connect_args_t * a);
-int vnet_unbind (vnet_unbind_args_t * a);
-int vnet_disconnect (vnet_disconnect_args_t * a);
+int vnet_unlisten (vnet_unlisten_args_t * a);
+int vnet_disconnect_session (vnet_disconnect_args_t * a);
+
+int vnet_app_add_cert_key_pair (vnet_app_add_cert_key_pair_args_t * a);
+int vnet_app_del_cert_key_pair (u32 index);
+/** Ask for app cb on pair deletion */
+int vnet_app_add_cert_key_interest (u32 index, u32 app_index);
+
+typedef struct app_session_transport_
+{
+  ip46_address_t rmt_ip;	/**< remote ip */
+  ip46_address_t lcl_ip;	/**< local ip */
+  u16 rmt_port;			/**< remote port (network order) */
+  u16 lcl_port;			/**< local port (network order) */
+  u8 is_ip4;			/**< set if uses ip4 networking */
+} app_session_transport_t;
+
+#define foreach_app_session_field					\
+  _(svm_fifo_t, *rx_fifo)		/**< rx fifo */			\
+  _(svm_fifo_t, *tx_fifo)		/**< tx fifo */			\
+  _(session_type_t, session_type)	/**< session type */		\
+  _(volatile u8, session_state)		/**< session state */		\
+  _(u32, session_index)			/**< index in owning pool */	\
+  _(app_session_transport_t, transport)	/**< transport info */		\
+  _(svm_msg_q_t, *vpp_evt_q)		/**< vpp event queue  */	\
+  _(u8, is_dgram)			/**< flag for dgram mode */	\
+
+typedef struct
+{
+#define _(type, name) type name;
+  foreach_app_session_field
+#undef _
+} app_session_t;
+
+typedef struct session_listen_msg_
+{
+  u32 client_index;
+  u32 context;			/* Not needed but keeping it for compatibility with bapi */
+  u32 wrk_index;
+  u32 vrf;
+  u16 port;
+  u8 proto;
+  u8 is_ip4;
+  ip46_address_t ip;
+  u32 ckpair_index;
+  u8 crypto_engine;
+  u8 flags;
+  uword ext_config;
+} __clib_packed session_listen_msg_t;
+
+STATIC_ASSERT (sizeof (session_listen_msg_t) <= SESSION_CTRL_MSG_MAX_SIZE,
+	       "msg too large");
+
+typedef struct session_listen_uri_msg_
+{
+  u32 client_index;
+  u32 context;
+  u8 uri[56];
+} __clib_packed session_listen_uri_msg_t;
+
+STATIC_ASSERT (sizeof (session_listen_uri_msg_t) <= SESSION_CTRL_MSG_MAX_SIZE,
+	       "msg too large");
+
+typedef struct session_bound_msg_
+{
+  u32 context;
+  u64 handle;
+  i32 retval;
+  u8 lcl_is_ip4;
+  u8 lcl_ip[16];
+  u16 lcl_port;
+  uword rx_fifo;
+  uword tx_fifo;
+  uword vpp_evt_q;
+  u64 segment_handle;
+} __clib_packed session_bound_msg_t;
+
+typedef struct session_unlisten_msg_
+{
+  u32 client_index;
+  u32 context;
+  u32 wrk_index;
+  session_handle_t handle;
+} __clib_packed session_unlisten_msg_t;
+
+typedef struct session_unlisten_reply_msg_
+{
+  u32 context;
+  u64 handle;
+  i32 retval;
+} __clib_packed session_unlisten_reply_msg_t;
+
+typedef struct session_accepted_msg_
+{
+  u32 context;
+  u64 listener_handle;
+  u64 handle;
+  uword server_rx_fifo;
+  uword server_tx_fifo;
+  u64 segment_handle;
+  uword vpp_event_queue_address;
+  u32 mq_index;
+  transport_endpoint_t rmt;
+  u8 flags;
+} __clib_packed session_accepted_msg_t;
+
+typedef struct session_accepted_reply_msg_
+{
+  u32 context;
+  i32 retval;
+  u64 handle;
+} __clib_packed session_accepted_reply_msg_t;
+
+typedef struct session_connect_msg_
+{
+  u32 client_index;
+  u32 context;
+  u32 wrk_index;
+  u32 vrf;
+  u16 port;
+  u16 lcl_port;
+  u8 proto;
+  u8 is_ip4;
+  ip46_address_t ip;
+  ip46_address_t lcl_ip;
+  u64 parent_handle;
+  u32 ckpair_index;
+  u8 crypto_engine;
+  u8 flags;
+  union
+  {
+    struct
+    {
+      u8 hostname[16];
+      u8 hostname_len;
+    } __clib_packed;
+    struct
+    {
+      uword ext_config;
+    } __clib_packed;
+  };
+} __clib_packed session_connect_msg_t;
+
+STATIC_ASSERT (sizeof (session_connect_msg_t) <= SESSION_CTRL_MSG_MAX_SIZE,
+	       "msg too large");
+
+typedef struct session_connect_uri_msg_
+{
+  u32 client_index;
+  u32 context;
+  u8 uri[56];
+} __clib_packed session_connect_uri_msg_t;
+
+STATIC_ASSERT (sizeof (session_connect_uri_msg_t) <=
+	       SESSION_CTRL_MSG_MAX_SIZE, "msg too large");
+
+typedef struct session_connected_msg_
+{
+  u32 context;
+  i32 retval;
+  u64 handle;
+  uword server_rx_fifo;
+  uword server_tx_fifo;
+  u64 segment_handle;
+  uword ct_rx_fifo;
+  uword ct_tx_fifo;
+  u64 ct_segment_handle;
+  uword vpp_event_queue_address;
+  u32 segment_size;
+  u8 segment_name_length;
+  u8 segment_name[64];
+  transport_endpoint_t lcl;
+} __clib_packed session_connected_msg_t;
+
+typedef struct session_disconnect_msg_
+{
+  u32 client_index;
+  u32 context;
+  session_handle_t handle;
+} __clib_packed session_disconnect_msg_t;
+
+typedef struct session_disconnected_msg_
+{
+  u32 client_index;
+  u32 context;
+  u64 handle;
+} __clib_packed session_disconnected_msg_t;
+
+typedef struct session_disconnected_reply_msg_
+{
+  u32 context;
+  i32 retval;
+  u64 handle;
+} __clib_packed session_disconnected_reply_msg_t;
+
+typedef struct session_reset_msg_
+{
+  u32 client_index;
+  u32 context;
+  u64 handle;
+} __clib_packed session_reset_msg_t;
 
-int
-api_parse_session_handle (u64 handle, u32 * session_index,
-			  u32 * thread_index);
+typedef struct session_reset_reply_msg_
+{
+  u32 context;
+  i32 retval;
+  u64 handle;
+} __clib_packed session_reset_reply_msg_t;
+
+typedef struct session_req_worker_update_msg_
+{
+  u64 session_handle;
+} __clib_packed session_req_worker_update_msg_t;
+
+/* NOTE: using u16 for wrk indices because message needs to fit in 18B */
+typedef struct session_worker_update_msg_
+{
+  u32 client_index;
+  u16 wrk_index;
+  u16 req_wrk_index;
+  u64 handle;
+} __clib_packed session_worker_update_msg_t;
+
+typedef struct session_worker_update_reply_msg_
+{
+  u64 handle;
+  uword rx_fifo;
+  uword tx_fifo;
+  u64 segment_handle;
+} __clib_packed session_worker_update_reply_msg_t;
+
+typedef struct session_app_detach_msg_
+{
+  u32 client_index;
+  u32 context;
+} session_app_detach_msg_t;
+
+typedef struct app_map_another_segment_msg_
+{
+  u32 client_index;
+  u32 context;
+  u8 fd_flags;
+  u32 segment_size;
+  u8 segment_name[128];
+  u64 segment_handle;
+} session_app_add_segment_msg_t;
+
+typedef struct app_unmap_segment_msg_
+{
+  u32 client_index;
+  u32 context;
+  u64 segment_handle;
+} session_app_del_segment_msg_t;
+
+typedef struct session_migrate_msg_
+{
+  uword vpp_evt_q;
+  session_handle_t handle;
+  session_handle_t new_handle;
+  u64 segment_handle;
+  u32 vpp_thread_index;
+} __clib_packed session_migrated_msg_t;
+
+typedef struct session_cleanup_msg_
+{
+  session_handle_t handle;
+  u8 type;
+} __clib_packed session_cleanup_msg_t;
+
+typedef struct session_app_wrk_rpc_msg_
+{
+  u32 client_index;	/**< app client index */
+  u32 wrk_index;	/**< dst worker index */
+  u8 data[64];		/**< rpc data */
+} __clib_packed session_app_wrk_rpc_msg_t;
+
+typedef struct session_transport_attr_msg_
+{
+  u32 client_index;
+  session_handle_t handle;
+  transport_endpt_attr_t attr;
+  u8 is_get;
+} __clib_packed session_transport_attr_msg_t;
+
+typedef struct session_transport_attr_reply_msg_
+{
+  i32 retval;
+  session_handle_t handle;
+  transport_endpt_attr_t attr;
+  u8 is_get;
+} __clib_packed session_transport_attr_reply_msg_t;
+
+typedef struct app_session_event_
+{
+  svm_msg_q_msg_t msg;
+  session_event_t *evt;
+} __clib_packed app_session_evt_t;
+
+static inline void
+app_alloc_ctrl_evt_to_vpp (svm_msg_q_t * mq, app_session_evt_t * app_evt,
+			   u8 evt_type)
+{
+  svm_msg_q_lock_and_alloc_msg_w_ring (mq,
+				       SESSION_MQ_CTRL_EVT_RING,
+				       SVM_Q_WAIT, &app_evt->msg);
+  app_evt->evt = svm_msg_q_msg_data (mq, &app_evt->msg);
+  clib_memset (app_evt->evt, 0, sizeof (*app_evt->evt));
+  app_evt->evt->event_type = evt_type;
+}
+
+static inline void
+app_send_ctrl_evt_to_vpp (svm_msg_q_t * mq, app_session_evt_t * app_evt)
+{
+  svm_msg_q_add_and_unlock (mq, &app_evt->msg);
+}
+
+/**
+ * Send fifo io event to vpp worker thread
+ *
+ * Because there may be multiple writers to one of vpp's queues, this
+ * protects message allocation and enqueueing.
+ *
+ * @param mq		vpp message queue
+ * @param f		fifo for which the event is sent
+ * @param evt_type	type of event
+ * @param noblock	flag to indicate is request is blocking or not
+ * @return		0 if success, negative integer otherwise
+ */
+static inline int
+app_send_io_evt_to_vpp (svm_msg_q_t * mq, u32 session_index, u8 evt_type,
+			u8 noblock)
+{
+  session_event_t *evt;
+  svm_msg_q_msg_t msg;
+
+  if (noblock)
+    {
+      if (svm_msg_q_try_lock (mq))
+	return -1;
+      if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)
+			 || svm_msg_q_is_full (mq)))
+	{
+	  svm_msg_q_unlock (mq);
+	  return -2;
+	}
+      msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
+      evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
+      evt->session_index = session_index;
+      evt->event_type = evt_type;
+      svm_msg_q_add_and_unlock (mq, &msg);
+      return 0;
+    }
+  else
+    {
+      svm_msg_q_lock (mq);
+      while (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)
+	     || svm_msg_q_is_full (mq))
+	svm_msg_q_wait_prod (mq);
+      msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
+      evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
+      evt->session_index = session_index;
+      evt->event_type = evt_type;
+      svm_msg_q_add_and_unlock (mq, &msg);
+      return 0;
+    }
+}
+
+always_inline int
+app_send_dgram_raw (svm_fifo_t * f, app_session_transport_t * at,
+		    svm_msg_q_t * vpp_evt_q, u8 * data, u32 len, u8 evt_type,
+		    u8 do_evt, u8 noblock)
+{
+  session_dgram_hdr_t hdr;
+  int rv;
+
+  if (svm_fifo_max_enqueue_prod (f) < (sizeof (session_dgram_hdr_t) + len))
+    return 0;
+
+  hdr.data_length = len;
+  hdr.data_offset = 0;
+  clib_memcpy_fast (&hdr.rmt_ip, &at->rmt_ip, sizeof (ip46_address_t));
+  hdr.is_ip4 = at->is_ip4;
+  hdr.rmt_port = at->rmt_port;
+  clib_memcpy_fast (&hdr.lcl_ip, &at->lcl_ip, sizeof (ip46_address_t));
+  hdr.lcl_port = at->lcl_port;
+
+  /* *INDENT-OFF* */
+  svm_fifo_seg_t segs[2] = {{ (u8 *) &hdr, sizeof (hdr) }, { data, len }};
+  /* *INDENT-ON* */
+
+  rv = svm_fifo_enqueue_segments (f, segs, 2, 0 /* allow partial */ );
+  if (PREDICT_FALSE (rv < 0))
+    return 0;
+
+  if (do_evt)
+    {
+      if (svm_fifo_set_event (f))
+	app_send_io_evt_to_vpp (vpp_evt_q, f->shr->master_session_index,
+				evt_type, noblock);
+    }
+  return len;
+}
+
+always_inline int
+app_send_dgram (app_session_t * s, u8 * data, u32 len, u8 noblock)
+{
+  return app_send_dgram_raw (s->tx_fifo, &s->transport, s->vpp_evt_q, data,
+			     len, SESSION_IO_EVT_TX, 1 /* do_evt */ ,
+			     noblock);
+}
+
+always_inline int
+app_send_stream_raw (svm_fifo_t * f, svm_msg_q_t * vpp_evt_q, u8 * data,
+		     u32 len, u8 evt_type, u8 do_evt, u8 noblock)
+{
+  int rv;
+
+  rv = svm_fifo_enqueue (f, len, data);
+  if (do_evt)
+    {
+      if (rv > 0 && svm_fifo_set_event (f))
+	app_send_io_evt_to_vpp (vpp_evt_q, f->shr->master_session_index,
+				evt_type, noblock);
+    }
+  return rv;
+}
+
+always_inline int
+app_send_stream (app_session_t * s, u8 * data, u32 len, u8 noblock)
+{
+  return app_send_stream_raw (s->tx_fifo, s->vpp_evt_q, data, len,
+			      SESSION_IO_EVT_TX, 1 /* do_evt */ , noblock);
+}
+
+always_inline int
+app_send (app_session_t * s, u8 * data, u32 len, u8 noblock)
+{
+  if (s->is_dgram)
+    return app_send_dgram (s, data, len, noblock);
+  return app_send_stream (s, data, len, noblock);
+}
+
+always_inline int
+app_recv_dgram_raw (svm_fifo_t * f, u8 * buf, u32 len,
+		    app_session_transport_t * at, u8 clear_evt, u8 peek)
+{
+  session_dgram_pre_hdr_t ph;
+  u32 max_deq;
+  int rv;
+
+  max_deq = svm_fifo_max_dequeue_cons (f);
+  if (max_deq <= sizeof (session_dgram_hdr_t))
+    {
+      if (clear_evt)
+	svm_fifo_unset_event (f);
+      return 0;
+    }
+
+  if (clear_evt)
+    svm_fifo_unset_event (f);
+
+  svm_fifo_peek (f, 0, sizeof (ph), (u8 *) & ph);
+  ASSERT (ph.data_length >= ph.data_offset);
+
+  /* Check if we have the full dgram */
+  if (max_deq < (ph.data_length + SESSION_CONN_HDR_LEN)
+      && len >= ph.data_length)
+    return 0;
+
+  svm_fifo_peek (f, sizeof (ph), sizeof (*at), (u8 *) at);
+  len = clib_min (len, ph.data_length - ph.data_offset);
+  rv = svm_fifo_peek (f, ph.data_offset + SESSION_CONN_HDR_LEN, len, buf);
+  if (peek)
+    return rv;
+
+  /* Discards data that did not fit in buffer */
+  svm_fifo_dequeue_drop (f, ph.data_length + SESSION_CONN_HDR_LEN);
+
+  return rv;
+}
+
+always_inline int
+app_recv_dgram (app_session_t * s, u8 * buf, u32 len)
+{
+  return app_recv_dgram_raw (s->rx_fifo, buf, len, &s->transport, 1, 0);
+}
+
+always_inline int
+app_recv_stream_raw (svm_fifo_t * f, u8 * buf, u32 len, u8 clear_evt, u8 peek)
+{
+  if (clear_evt)
+    svm_fifo_unset_event (f);
+
+  if (peek)
+    return svm_fifo_peek (f, 0, len, buf);
+
+  return svm_fifo_dequeue (f, len, buf);
+}
+
+always_inline int
+app_recv_stream (app_session_t * s, u8 * buf, u32 len)
+{
+  return app_recv_stream_raw (s->rx_fifo, buf, len, 1, 0);
+}
+
+always_inline int
+app_recv (app_session_t * s, u8 * data, u32 len)
+{
+  if (s->is_dgram)
+    return app_recv_dgram (s, data, len);
+  return app_recv_stream (s, data, len);
+}
+
+/* *INDENT-OFF* */
+static char *session_error_str[] = {
+#define _(sym, str) str,
+    foreach_session_error
+#undef _
+};
+/* *INDENT-ON* */
+
+static inline u8 *
+format_session_error (u8 * s, va_list * args)
+{
+  session_error_t error = va_arg (*args, session_error_t);
+  if (-error >= 0 && -error < SESSION_N_ERRORS)
+    s = format (s, "%s", session_error_str[-error]);
+  else
+    s = format (s, "invalid session err %u", -error);
+  return s;
+}
+
+/*
+ * Socket API messages
+ */
+
+typedef enum app_sapi_msg_type
+{
+  APP_SAPI_MSG_TYPE_NONE,
+  APP_SAPI_MSG_TYPE_ATTACH,
+  APP_SAPI_MSG_TYPE_ATTACH_REPLY,
+  APP_SAPI_MSG_TYPE_ADD_DEL_WORKER,
+  APP_SAPI_MSG_TYPE_ADD_DEL_WORKER_REPLY,
+  APP_SAPI_MSG_TYPE_SEND_FDS,
+} __clib_packed app_sapi_msg_type_e;
+
+typedef struct app_sapi_attach_msg_
+{
+  u8 name[64];
+  u64 options[18];
+} __clib_packed app_sapi_attach_msg_t;
+
+STATIC_ASSERT (sizeof (u64) * APP_OPTIONS_N_OPTIONS <=
+	       sizeof (((app_sapi_attach_msg_t *) 0)->options),
+	       "Out of options, fix message definition");
+
+typedef struct app_sapi_attach_reply_msg_
+{
+  i32 retval;
+  u32 app_index;
+  u64 app_mq;
+  u64 vpp_ctrl_mq;
+  u64 segment_handle;
+  u32 api_client_handle;
+  u8 vpp_ctrl_mq_thread;
+  u8 n_fds;
+  u8 fd_flags;
+} __clib_packed app_sapi_attach_reply_msg_t;
+
+typedef struct app_sapi_worker_add_del_msg_
+{
+  u32 app_index;
+  u32 wrk_index;
+  u8 is_add;
+} __clib_packed app_sapi_worker_add_del_msg_t;
+
+typedef struct app_sapi_worker_add_del_reply_msg_
+{
+  i32 retval;
+  u32 wrk_index;
+  u64 app_event_queue_address;
+  u64 segment_handle;
+  u32 api_client_handle;
+  u8 n_fds;
+  u8 fd_flags;
+  u8 is_add;
+} __clib_packed app_sapi_worker_add_del_reply_msg_t;
+
+typedef struct app_sapi_msg_
+{
+  app_sapi_msg_type_e type;
+  union
+  {
+    app_sapi_attach_msg_t attach;
+    app_sapi_attach_reply_msg_t attach_reply;
+    app_sapi_worker_add_del_msg_t worker_add_del;
+    app_sapi_worker_add_del_reply_msg_t worker_add_del_reply;
+  };
+} __clib_packed app_sapi_msg_t;
 
 #endif /* __included_uri_h__ */