session: api to add new transport types

Type: feature

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: If4dee6dba1ea942daa921d566b35cdecdda680ee

21 files changed, 150 insertions, 103 deletions

diff --git a/src/plugins/hs_apps/sapi/vpp_echo.c b/src/plugins/hs_apps/sapi/vpp_echo.c
index 4dd8e0f2d80..d6f0b28cc18 100644
--- a/src/plugins/hs_apps/sapi/vpp_echo.c
+++ b/src/plugins/hs_apps/sapi/vpp_echo.c
@@ -1052,7 +1052,7 @@ print_usage_and_exit (void)
 	   "  nthreads N          Use N busy loop threads for data [in addition to main & msg queue]\n"
 	   "  TX=1337[K|M|G]|RX   Send 1337 [K|M|G]bytes, use TX=RX to reflect the data\n"
 	   "  RX=1337[K|M|G]      Expect 1337 [K|M|G]bytes\n" "\n");
-  for (i = 0; i < TRANSPORT_N_PROTO; i++)
+  for (i = 0; i < vec_len (em->available_proto_cb_vft); i++)
     {
       echo_proto_cb_vft_t *vft = em->available_proto_cb_vft[i];
       if (vft && vft->print_usage_cb)
@@ -1069,7 +1069,7 @@ echo_process_each_proto_opts (unformat_input_t * a)
 {
   echo_main_t *em = &echo_main;
   int i, rv;
-  for (i = 0; i < TRANSPORT_N_PROTO; i++)
+  for (i = 0; i < vec_len (em->available_proto_cb_vft); i++)
     {
       echo_proto_cb_vft_t *vft = em->available_proto_cb_vft[i];
       if (vft && vft->process_opts_cb)
@@ -1083,7 +1083,7 @@ static void
 echo_set_each_proto_defaults_before_opts (echo_main_t * em)
 {
   int i;
-  for (i = 0; i < TRANSPORT_N_PROTO; i++)
+  for (i = 0; i < vec_len (em->available_proto_cb_vft); i++)
     {
       echo_proto_cb_vft_t *vft = em->available_proto_cb_vft[i];
       if (vft && vft->set_defaults_before_opts_cb)
@@ -1445,6 +1445,7 @@ exit_on_error:
   else
     print_global_stats (em);
   vec_free (em->fail_descr);
+  vec_free (em->available_proto_cb_vft);
   exit (em->has_failed);
 }
 
diff --git a/src/plugins/hs_apps/sapi/vpp_echo_common.c b/src/plugins/hs_apps/sapi/vpp_echo_common.c
index e38b17cc013..60ea5a13214 100644
--- a/src/plugins/hs_apps/sapi/vpp_echo_common.c
+++ b/src/plugins/hs_apps/sapi/vpp_echo_common.c
@@ -309,10 +309,6 @@ unformat_transport_proto (unformat_input_t * input, va_list * args)
     *proto = TRANSPORT_PROTO_UDP;
   else if (unformat (input, "UDP"))
     *proto = TRANSPORT_PROTO_UDP;
-  else if (unformat (input, "sctp"))
-    *proto = TRANSPORT_PROTO_SCTP;
-  else if (unformat (input, "SCTP"))
-    *proto = TRANSPORT_PROTO_SCTP;
   else if (unformat (input, "tls"))
     *proto = TRANSPORT_PROTO_TLS;
   else if (unformat (input, "TLS"))
@@ -338,9 +334,6 @@ format_transport_proto (u8 * s, va_list * args)
     case TRANSPORT_PROTO_UDP:
       s = format (s, "UDP");
       break;
-    case TRANSPORT_PROTO_SCTP:
-      s = format (s, "SCTP");
-      break;
     case TRANSPORT_PROTO_NONE:
       s = format (s, "NONE");
       break;
diff --git a/src/plugins/hs_apps/sapi/vpp_echo_common.h b/src/plugins/hs_apps/sapi/vpp_echo_common.h
index 0c85b499e9c..f01bb0390f6 100644
--- a/src/plugins/hs_apps/sapi/vpp_echo_common.h
+++ b/src/plugins/hs_apps/sapi/vpp_echo_common.h
@@ -146,12 +146,13 @@ do {                                                                    \
          clib_warning (_fmt, ##_args);  \
   }
 
-#define ECHO_REGISTER_PROTO(proto, vft)         \
-  static void __clib_constructor                \
-  vpp_echo_init_##proto ()                      \
-  {                                             \
-    echo_main_t *em = &echo_main;               \
-    em->available_proto_cb_vft[proto] = &vft;   \
+#define ECHO_REGISTER_PROTO(proto, vft)         	\
+  static void __clib_constructor                	\
+  vpp_echo_init_##proto ()                      	\
+  {                                             	\
+    echo_main_t *em = &echo_main;               	\
+    vec_validate (em->available_proto_cb_vft, proto);	\
+    em->available_proto_cb_vft[proto] = &vft;   	\
   }
 
 typedef struct
@@ -356,7 +357,7 @@ typedef struct
 
   /* VNET_API_ERROR_FOO -> "Foo" hash table */
   uword *error_string_by_error_number;
-  echo_proto_cb_vft_t *available_proto_cb_vft[TRANSPORT_N_PROTO];
+  echo_proto_cb_vft_t **available_proto_cb_vft;
 
   echo_stats_t stats;
   echo_stats_t last_stat_sampling;	/* copy of stats at last sampling */
diff --git a/src/plugins/hs_apps/sapi/vpp_echo_proto_tcp.c b/src/plugins/hs_apps/sapi/vpp_echo_proto_tcp.c
index 0a4a0bdbc1f..94f1d3054ab 100644
--- a/src/plugins/hs_apps/sapi/vpp_echo_proto_tcp.c
+++ b/src/plugins/hs_apps/sapi/vpp_echo_proto_tcp.c
@@ -142,7 +142,6 @@ echo_proto_cb_vft_t echo_tls_proto_cb_vft = {
 
 ECHO_REGISTER_PROTO (TRANSPORT_PROTO_TCP, echo_tcp_proto_cb_vft);
 ECHO_REGISTER_PROTO (TRANSPORT_PROTO_TLS, echo_tls_proto_cb_vft);
-ECHO_REGISTER_PROTO (TRANSPORT_PROTO_SCTP, echo_tcp_proto_cb_vft);
 
 /*
  * fd.io coding-style-patch-verification: ON
diff --git a/src/plugins/quic/quic.c b/src/plugins/quic/quic.c
index 8b111369fed..03e46c60616 100644
--- a/src/plugins/quic/quic.c
+++ b/src/plugins/quic/quic.c
@@ -2398,6 +2398,8 @@ static const transport_proto_vft_t quic_proto = {
   .get_transport_endpoint = quic_get_transport_endpoint,
   .get_transport_listener_endpoint = quic_get_transport_listener_endpoint,
   .transport_options = {
+    .name = "quic",
+    .short_name = "Q",
     .tx_type = TRANSPORT_TX_INTERNAL,
     .service_type = TRANSPORT_SERVICE_APP,
   },
diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 46cea2a1884..c509f93557c 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -1530,10 +1530,6 @@ vppcom_unformat_proto (uint8_t * proto, char *proto_str)
     *proto = VPPCOM_PROTO_UDPC;
   else if (!strcmp (proto_str, "udpc"))
     *proto = VPPCOM_PROTO_UDPC;
-  else if (!strcmp (proto_str, "SCTP"))
-    *proto = VPPCOM_PROTO_SCTP;
-  else if (!strcmp (proto_str, "sctp"))
-    *proto = VPPCOM_PROTO_SCTP;
   else if (!strcmp (proto_str, "TLS"))
     *proto = VPPCOM_PROTO_TLS;
   else if (!strcmp (proto_str, "tls"))
diff --git a/src/vcl/vppcom.h b/src/vcl/vppcom.h
index 62613037575..d2a5a103f8d 100644
--- a/src/vcl/vppcom.h
+++ b/src/vcl/vppcom.h
@@ -49,7 +49,6 @@ typedef enum
 {
   VPPCOM_PROTO_TCP = 0,
   VPPCOM_PROTO_UDP,
-  VPPCOM_PROTO_SCTP,
   VPPCOM_PROTO_NONE,
   VPPCOM_PROTO_TLS,
   VPPCOM_PROTO_UDPC,
@@ -69,9 +68,6 @@ vppcom_proto_str (vppcom_proto_t proto)
     case VPPCOM_PROTO_UDP:
       proto_str = "UDP";
       break;
-    case VPPCOM_PROTO_SCTP:
-      proto_str = "SCTP";
-      break;
     case VPPCOM_PROTO_TLS:
       proto_str = "TLS";
       break;
diff --git a/src/vnet/session/application_local.c b/src/vnet/session/application_local.c
index cc02026e3bb..e2c1082d0b7 100644
--- a/src/vnet/session/application_local.c
+++ b/src/vnet/session/application_local.c
@@ -558,6 +558,8 @@ static const transport_proto_vft_t cut_thru_proto = {
   .format_listener = format_ct_listener,
   .format_connection = format_ct_session,
   .transport_options = {
+    .name = "ct",
+    .short_name = "C",
     .tx_type = TRANSPORT_TX_INTERNAL,
     .service_type = TRANSPORT_SERVICE_APP,
   },
diff --git a/src/vnet/session/session.api b/src/vnet/session/session.api
index 4ff6367fa27..905ab5630d9 100644
--- a/src/vnet/session/session.api
+++ b/src/vnet/session/session.api
@@ -23,7 +23,6 @@ enum transport_proto : u8
 {
         TRANSPORT_PROTO_API_TCP,
         TRANSPORT_PROTO_API_UDP,
-        TRANSPORT_PROTO_API_SCTP,
         TRANSPORT_PROTO_API_NONE,
         TRANSPORT_PROTO_API_TLS,
         TRANSPORT_PROTO_API_UDPC,
diff --git a/src/vnet/session/session.c b/src/vnet/session/session.c
index bd69f752de4..fa4cd85e5e4 100644
--- a/src/vnet/session/session.c
+++ b/src/vnet/session/session.c
@@ -1469,12 +1469,6 @@ static session_fifo_rx_fn *session_tx_fns[TRANSPORT_TX_N_FNS] = {
 };
 /* *INDENT-ON* */
 
-/**
- * Initialize session layer for given transport proto and ip version
- *
- * Allocates per session type (transport proto + ip version) data structures
- * and adds arc from session queue node to session type output node.
- */
 void
 session_register_transport (transport_proto_t transport_proto,
 			    const transport_proto_vft_t * vft, u8 is_ip4,
@@ -1505,6 +1499,24 @@ session_register_transport (transport_proto_t transport_proto,
     session_tx_fns[vft->transport_options.tx_type];
 }
 
+transport_proto_t
+session_add_transport_proto (void)
+{
+  session_main_t *smm = &session_main;
+  session_worker_t *wrk;
+  u32 thread;
+
+  smm->last_transport_proto_type += 1;
+
+  for (thread = 0; thread < vec_len (smm->wrk); thread++)
+    {
+      wrk = session_main_get_worker (thread);
+      vec_validate (wrk->session_to_enqueue, smm->last_transport_proto_type);
+    }
+
+  return smm->last_transport_proto_type;
+}
+
 transport_connection_t *
 session_get_transport (session_t * s)
 {
@@ -1558,6 +1570,7 @@ session_manager_main_enable (vlib_main_t * vm)
   if (num_threads < 1)
     return clib_error_return (0, "n_thread_stacks not set");
 
+  smm->last_transport_proto_type = TRANSPORT_PROTO_QUIC;
   /* Allocate cache line aligned worker contexts */
   vec_validate_aligned (smm->wrk, num_threads - 1, CLIB_CACHE_LINE_BYTES);
 
@@ -1570,6 +1583,7 @@ session_manager_main_enable (vlib_main_t * vm)
       wrk->vm = vlib_mains[i];
       wrk->last_vlib_time = vlib_time_now (vlib_mains[i]);
       wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
+      vec_validate (wrk->session_to_enqueue, smm->last_transport_proto_type);
 
       if (num_threads > 1)
 	clib_rwlock_init (&smm->wrk[i].peekers_rw_locks);
diff --git a/src/vnet/session/session.h b/src/vnet/session/session.h
index 486c976cdf5..0a72f97a2f8 100644
--- a/src/vnet/session/session.h
+++ b/src/vnet/session/session.h
@@ -91,7 +91,7 @@ typedef struct session_worker_
   vlib_main_t *vm;
 
   /** Per-proto vector of sessions to enqueue */
-  u32 *session_to_enqueue[TRANSPORT_N_PROTO];
+  u32 **session_to_enqueue;
 
   /** Context for session tx */
   session_tx_context_t ctx;
@@ -158,6 +158,8 @@ typedef struct session_main_
    * Trade memory for speed, for now */
   u32 *session_type_to_next;
 
+  transport_proto_t last_transport_proto_type;
+
   /*
    * Config parameters
    */
@@ -203,6 +205,9 @@ extern vlib_node_registration_t session_queue_pre_input_node;
 #define SESSION_Q_PROCESS_FLUSH_FRAMES	1
 #define SESSION_Q_PROCESS_STOP		2
 
+#define TRANSPORT_PROTO_INVALID (session_main.last_transport_proto_type + 1)
+#define TRANSPORT_N_PROTOS (session_main.last_transport_proto_type + 1)
+
 static inline session_evt_elt_t *
 session_evt_elt_alloc (session_worker_t * wrk)
 {
@@ -459,9 +464,22 @@ void session_transport_closed_notify (transport_connection_t * tc);
 void session_transport_reset_notify (transport_connection_t * tc);
 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
 			   u32 thread_index, u8 notify);
+/**
+ * Initialize session layer for given transport proto and ip version
+ *
+ * Allocates per session type (transport proto + ip version) data structures
+ * and adds arc from session queue node to session type output node.
+ *
+ * @param transport_proto 	transport proto to be registered
+ * @param vft			virtual function table for transport
+ * @param is_ip4		flag that indicates if transports uses ipv4
+ * 				as underlying network layer
+ * @param output_node		output node for transport
+ */
 void session_register_transport (transport_proto_t transport_proto,
 				 const transport_proto_vft_t * vft, u8 is_ip4,
 				 u32 output_node);
+transport_proto_t session_add_transport_proto (void);
 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
 				u32 offset, u32 max_bytes);
 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
diff --git a/src/vnet/session/session_api.c b/src/vnet/session/session_api.c
index eb5b2c36f99..88deafe13e5 100644
--- a/src/vnet/session/session_api.c
+++ b/src/vnet/session/session_api.c
@@ -74,8 +74,6 @@ api_session_transport_proto_decode (const vl_api_transport_proto_t * api_tp)
       return TRANSPORT_PROTO_TCP;
     case TRANSPORT_PROTO_API_UDP:
       return TRANSPORT_PROTO_UDP;
-    case TRANSPORT_PROTO_API_SCTP:
-      return TRANSPORT_PROTO_SCTP;
     case TRANSPORT_PROTO_API_TLS:
       return TRANSPORT_PROTO_TLS;
     case TRANSPORT_PROTO_API_UDPC:
@@ -96,8 +94,6 @@ api_session_transport_proto_encode (const transport_proto_t tp)
       return TRANSPORT_PROTO_API_TCP;
     case TRANSPORT_PROTO_UDP:
       return TRANSPORT_PROTO_API_UDP;
-    case TRANSPORT_PROTO_SCTP:
-      return TRANSPORT_PROTO_API_SCTP;
     case TRANSPORT_PROTO_TLS:
       return TRANSPORT_PROTO_API_TLS;
     case TRANSPORT_PROTO_UDPC:
@@ -1517,7 +1513,7 @@ vl_api_session_rules_dump_t_handler (vl_api_one_map_server_dump_t * mp)
 
   /* *INDENT-OFF* */
   session_table_foreach (st, ({
-    for (tp = 0; tp < TRANSPORT_N_PROTO; tp++)
+    for (tp = 0; tp < TRANSPORT_N_PROTOS; tp++)
       {
         send_session_rules_table_details (&st->session_rules[tp],
                                           st->active_fib_proto, tp,
diff --git a/src/vnet/session/session_cli.c b/src/vnet/session/session_cli.c
index aba1c610e18..682249ae60f 100644
--- a/src/vnet/session/session_cli.c
+++ b/src/vnet/session/session_cli.c
@@ -372,7 +372,7 @@ session_cli_filter_check (session_t * s, session_state_t * states,
 
 check_transport:
 
-  if (tp != TRANSPORT_N_PROTO && session_get_transport_proto (s) != tp)
+  if (tp != TRANSPORT_PROTO_INVALID && session_get_transport_proto (s) != tp)
     return 0;
 
   return 1;
@@ -398,7 +398,7 @@ session_cli_show_session_filter (vlib_main_t * vm, u32 thread_index,
 
   pool = wrk->sessions;
 
-  if (tp == TRANSPORT_N_PROTO && states == 0 && !verbose
+  if (tp == TRANSPORT_PROTO_INVALID && states == 0 && !verbose
       && (start == 0 && end == ~0))
     {
       vlib_cli_output (vm, "Thread %d: %u sessions", thread_index,
@@ -473,14 +473,6 @@ session_cli_show_events (vlib_main_t * vm, u32 thread_index)
 }
 
 static void
-session_cli_print_transport_protos (vlib_main_t * vm)
-{
-#define _(sym, str, sstr) vlib_cli_output (vm, str);
-  foreach_transport_proto
-#undef _
-}
-
-static void
 session_cli_print_session_states (vlib_main_t * vm)
 {
 #define _(sym, str) vlib_cli_output (vm, str);
@@ -495,7 +487,7 @@ show_session_command_fn (vlib_main_t * vm, unformat_input_t * input,
   u8 one_session = 0, do_listeners = 0, sst, do_elog = 0, do_filter = 0;
   u32 track_index, thread_index = 0, start = 0, end = ~0, session_index;
   unformat_input_t _line_input, *line_input = &_line_input;
-  transport_proto_t transport_proto = TRANSPORT_N_PROTO;
+  transport_proto_t transport_proto = TRANSPORT_PROTO_INVALID;
   session_state_t state = SESSION_N_STATES, *states = 0;
   session_main_t *smm = &session_main;
   clib_error_t *error = 0;
@@ -585,7 +577,7 @@ show_session_command_fn (vlib_main_t * vm, unformat_input_t * input,
 	do_elog = 1;
       else if (unformat (line_input, "protos"))
 	{
-	  session_cli_print_transport_protos (vm);
+	  vlib_cli_output (vm, "%U", format_transport_protos);
 	  goto done;
 	}
       else if (unformat (line_input, "states"))
diff --git a/src/vnet/session/session_table.c b/src/vnet/session/session_table.c
index d619fa580d8..d0b576fda7b 100644
--- a/src/vnet/session/session_table.c
+++ b/src/vnet/session/session_table.c
@@ -129,7 +129,8 @@ session_table_init (session_table_t * slt, u8 fib_proto)
       clib_bihash_init2_48_8 (a);
     }
 
-  for (i = 0; i < TRANSPORT_N_PROTO; i++)
+  vec_validate (slt->session_rules, TRANSPORT_N_PROTOS - 1);
+  for (i = 0; i < TRANSPORT_N_PROTOS; i++)
     session_rules_table_init (&slt->session_rules[i]);
 }
 
diff --git a/src/vnet/session/session_table.h b/src/vnet/session/session_table.h
index d3af566a77d..cf4e9698e3a 100644
--- a/src/vnet/session/session_table.h
+++ b/src/vnet/session/session_table.h
@@ -37,7 +37,7 @@ typedef struct _session_lookup_table
   /**
    * Per fib proto and transport proto session rules tables
    */
-  session_rules_table_t session_rules[TRANSPORT_N_PROTO];
+  session_rules_table_t *session_rules;
 
   /** Flag that indicates if table has local scope */
   u8 is_local;
diff --git a/src/vnet/session/transport.c b/src/vnet/session/transport.c
index 16f4f02cbe3..d9a54fff64f 100644
--- a/src/vnet/session/transport.c
+++ b/src/vnet/session/transport.c
@@ -46,18 +46,12 @@ u8 *
 format_transport_proto (u8 * s, va_list * args)
 {
   u32 transport_proto = va_arg (*args, u32);
-  switch (transport_proto)
-    {
-#define _(sym, str, sstr) 			\
-    case TRANSPORT_PROTO_ ## sym:		\
-      s = format (s, str);			\
-      break;
-      foreach_transport_proto
-#undef _
-    default:
-      s = format (s, "UNKNOWN");
-      break;
-    }
+
+  if (tp_vfts[transport_proto].transport_options.name)
+    s = format (s, "%s", tp_vfts[transport_proto].transport_options.name);
+  else
+    s = format (s, "n/a");
+
   return s;
 }
 
@@ -65,18 +59,14 @@ u8 *
 format_transport_proto_short (u8 * s, va_list * args)
 {
   u32 transport_proto = va_arg (*args, u32);
-  switch (transport_proto)
-    {
-#define _(sym, str, sstr) 			\
-    case TRANSPORT_PROTO_ ## sym:		\
-      s = format (s, sstr);			\
-      break;
-      foreach_transport_proto
-#undef _
-    default:
-      s = format (s, "?");
-      break;
-    }
+  char *short_name;
+
+  short_name = tp_vfts[transport_proto].transport_options.short_name;
+  if (short_name)
+    s = format (s, "%s", short_name);
+  else
+    s = format (s, "NA");
+
   return s;
 }
 
@@ -158,23 +148,29 @@ uword
 unformat_transport_proto (unformat_input_t * input, va_list * args)
 {
   u32 *proto = va_arg (*args, u32 *);
+  transport_proto_vft_t *tp_vft;
   u8 longest_match = 0, match;
-  char *str_match = 0;
-
-#define _(sym, str, sstr)						\
-  if (unformat_transport_str_match (input, str))			\
-    {									\
-      match = strlen (str);						\
-      if (match > longest_match)					\
-	{								\
-	  *proto = TRANSPORT_PROTO_ ## sym;				\
-	  longest_match = match;					\
-	  str_match = str;						\
-	}								\
+  char *str, *str_match = 0;
+  transport_proto_t tp;
+
+  for (tp = 0; tp < vec_len (tp_vfts); tp++)
+    {
+      tp_vft = &tp_vfts[tp];
+      str = tp_vft->transport_options.name;
+      if (!str)
+	continue;
+      if (unformat_transport_str_match (input, str))
+	{
+	  match = strlen (str);
+	  if (match > longest_match)
+	    {
+	      *proto = tp;
+	      longest_match = match;
+	      str_match = str;
+	    }
+	}
     }
-  foreach_transport_proto
-#undef _
-    if (longest_match)
+  if (longest_match)
     {
       unformat (input, str_match);
       return 1;
@@ -183,6 +179,17 @@ unformat_transport_proto (unformat_input_t * input, va_list * args)
   return 0;
 }
 
+u8 *
+format_transport_protos (u8 * s, va_list * args)
+{
+  transport_proto_vft_t *tp_vft;
+
+  vec_foreach (tp_vft, tp_vfts)
+    s = format (s, "%s\n", tp_vft->transport_options.name);
+
+  return s;
+}
+
 u32
 transport_endpoint_lookup (transport_endpoint_table_t * ht, u8 proto,
 			   ip46_address_t * ip, u16 port)
@@ -228,15 +235,6 @@ transport_endpoint_table_del (transport_endpoint_table_t * ht, u8 proto,
   clib_bihash_add_del_24_8 (ht, &kv, 0);
 }
 
-/**
- * Register transport virtual function table.
- *
- * @param transport_proto - transport protocol type (i.e., TCP, UDP ..)
- * @param vft - virtual function table for transport proto
- * @param fib_proto - network layer protocol
- * @param output_node - output node index that session layer will hand off
- * 			buffers to, for requested fib proto
- */
 void
 transport_register_protocol (transport_proto_t transport_proto,
 			     const transport_proto_vft_t * vft,
@@ -250,6 +248,24 @@ transport_register_protocol (transport_proto_t transport_proto,
   session_register_transport (transport_proto, vft, is_ip4, output_node);
 }
 
+transport_proto_t
+transport_register_new_protocol (const transport_proto_vft_t * vft,
+				 fib_protocol_t fib_proto, u32 output_node)
+{
+  transport_proto_t transport_proto;
+  u8 is_ip4;
+
+  transport_proto = session_add_transport_proto ();
+  is_ip4 = fib_proto == FIB_PROTOCOL_IP4;
+
+  vec_validate (tp_vfts, transport_proto);
+  tp_vfts[transport_proto] = *vft;
+
+  session_register_transport (transport_proto, vft, is_ip4, output_node);
+
+  return transport_proto;
+}
+
 /**
  * Get transport virtual function table
  *
diff --git a/src/vnet/session/transport.h b/src/vnet/session/transport.h
index 3c4e15a9a6b..e5c09cd767d 100644
--- a/src/vnet/session/transport.h
+++ b/src/vnet/session/transport.h
@@ -27,6 +27,8 @@
 
 typedef struct _transport_options_t
 {
+  char *name;
+  char *short_name;
   transport_tx_fn_type_t tx_type;
   transport_service_type_t service_type;
   u8 half_open_has_fifos;
@@ -195,9 +197,21 @@ transport_connection_deschedule (transport_connection_t * tc)
 
 void transport_connection_reschedule (transport_connection_t * tc);
 
+/**
+ * Register transport virtual function table.
+ *
+ * @param transport_proto - transport protocol type (i.e., TCP, UDP ..)
+ * @param vft - virtual function table for transport proto
+ * @param fib_proto - network layer protocol
+ * @param output_node - output node index that session layer will hand off
+ * 			buffers to, for requested fib proto
+ */
 void transport_register_protocol (transport_proto_t transport_proto,
 				  const transport_proto_vft_t * vft,
 				  fib_protocol_t fib_proto, u32 output_node);
+transport_proto_t
+transport_register_new_protocol (const transport_proto_vft_t * vft,
+				 fib_protocol_t fib_proto, u32 output_node);
 transport_proto_vft_t *transport_protocol_get_vft (transport_proto_t tp);
 void transport_update_time (clib_time_type_t time_now, u8 thread_index);
 
diff --git a/src/vnet/session/transport_types.h b/src/vnet/session/transport_types.h
index 323d261ad89..44934daf0f0 100644
--- a/src/vnet/session/transport_types.h
+++ b/src/vnet/session/transport_types.h
@@ -151,7 +151,6 @@ STATIC_ASSERT (sizeof (transport_connection_t) <= 128,
 #define foreach_transport_proto				\
   _(TCP, "tcp", "T")					\
   _(UDP, "udp", "U")					\
-  _(SCTP, "sctp", "S")					\
   _(NONE, "ct", "C")					\
   _(TLS, "tls", "J")					\
   _(UDPC, "udpc", "U")					\
@@ -162,7 +161,6 @@ typedef enum _transport_proto
 #define _(sym, str, sstr) TRANSPORT_PROTO_ ## sym,
   foreach_transport_proto
 #undef _
-  TRANSPORT_N_PROTO
 } transport_proto_t;
 
 u8 *format_transport_proto (u8 * s, va_list * args);
@@ -172,6 +170,7 @@ u8 *format_transport_listen_connection (u8 * s, va_list * args);
 u8 *format_transport_half_open_connection (u8 * s, va_list * args);
 
 uword unformat_transport_proto (unformat_input_t * input, va_list * args);
+u8 *format_transport_protos (u8 * s, va_list * args);
 
 #define foreach_transport_endpoint_fields				\
   _(ip46_address_t, ip) /**< ip address in net order */			\
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 8a09b565ffa..25a3a446463 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -1548,6 +1548,8 @@ const static transport_proto_vft_t tcp_proto = {
   .format_listener = format_tcp_listener_session,
   .format_half_open = format_tcp_half_open_session,
   .transport_options = {
+    .name = "tcp",
+    .short_name = "T",
     .tx_type = TRANSPORT_TX_PEEK,
     .service_type = TRANSPORT_SERVICE_VC,
   },
diff --git a/src/vnet/tls/tls.c b/src/vnet/tls/tls.c
index 73a54c86282..88ce3591bb6 100644
--- a/src/vnet/tls/tls.c
+++ b/src/vnet/tls/tls.c
@@ -869,6 +869,8 @@ static const transport_proto_vft_t tls_proto = {
   .get_transport_endpoint = tls_transport_endpoint_get,
   .get_transport_listener_endpoint = tls_transport_listener_endpoint_get,
   .transport_options = {
+    .name = "tls",
+    .short_name = "J",
     .tx_type = TRANSPORT_TX_INTERNAL,
     .service_type = TRANSPORT_SERVICE_APP,
   },
diff --git a/src/vnet/udp/udp.c b/src/vnet/udp/udp.c
index 109f4683e7f..8fa1147b030 100644
--- a/src/vnet/udp/udp.c
+++ b/src/vnet/udp/udp.c
@@ -361,6 +361,8 @@ static const transport_proto_vft_t udp_proto = {
   .format_half_open = format_udp_half_open_session,
   .format_listener = format_udp_listener_session,
   .transport_options = {
+    .name = "udp",
+    .short_name = "U",
     .tx_type = TRANSPORT_TX_DGRAM,
     .service_type = TRANSPORT_SERVICE_CL,
   },
@@ -415,6 +417,8 @@ static const transport_proto_vft_t udpc_proto = {
   .format_half_open = format_udp_half_open_session,
   .format_listener = format_udp_listener_session,
   .transport_options = {
+    .name = "udpc",
+    .short_name = "U",
     .tx_type = TRANSPORT_TX_DGRAM,
     .service_type = TRANSPORT_SERVICE_VC,
     .half_open_has_fifos = 1