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, 459 insertions, 0 deletions

diff --git a/src/vnet/session/application_interface.c b/src/vnet/session/application_interface.c
new file mode 100644
index 00000000000..0ea77fd8c4e
--- /dev/null
+++ b/src/vnet/session/application_interface.c
@@ -0,0 +1,459 @@
+/*
+ * Copyright (c) 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/session/application_interface.h>
+
+#include <vnet/session/session.h>
+#include <vlibmemory/api.h>
+#include <vnet/dpo/load_balance.h>
+#include <vnet/fib/ip4_fib.h>
+
+/** @file
+    VPP's application/session API bind/unbind/connect/disconnect calls
+*/
+
+static u8
+ip_is_zero (ip46_address_t * ip46_address, u8 is_ip4)
+{
+  if (is_ip4)
+    return (ip46_address->ip4.as_u32 == 0);
+  else
+    return (ip46_address->as_u64[0] == 0 && ip46_address->as_u64[1] == 0);
+}
+
+static u8
+ip_is_local (ip46_address_t * ip46_address, u8 is_ip4)
+{
+  fib_node_index_t fei;
+  fib_entry_flag_t flags;
+  fib_prefix_t prefix;
+
+  /* Check if requester is local */
+  if (is_ip4)
+    {
+      prefix.fp_len = 32;
+      prefix.fp_proto = FIB_PROTOCOL_IP4;
+    }
+  else
+    {
+      prefix.fp_len = 128;
+      prefix.fp_proto = FIB_PROTOCOL_IP6;
+    }
+
+  clib_memcpy (&prefix.fp_addr, ip46_address, sizeof (ip46_address));
+  fei = fib_table_lookup (0, &prefix);
+  flags = fib_entry_get_flags (fei);
+
+  return (flags & FIB_ENTRY_FLAG_LOCAL);
+}
+
+int
+api_parse_session_handle (u64 handle, u32 * session_index, u32 * thread_index)
+{
+  session_manager_main_t *smm = vnet_get_session_manager_main ();
+  stream_session_t *pool;
+
+  *thread_index = handle & 0xFFFFFFFF;
+  *session_index = handle >> 32;
+
+  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;
+}
+
+int
+vnet_bind_i (u32 api_client_index, ip46_address_t * ip46, u16 port_host_order,
+	     session_type_t sst, u64 * options, session_cb_vft_t * cb_fns,
+	     application_t ** app, u32 * len_seg_name, char *seg_name)
+{
+  u8 *segment_name = 0;
+  application_t *server = 0;
+  stream_session_t *listener;
+  u8 is_ip4;
+
+  listener =
+    stream_session_lookup_listener (ip46,
+				    clib_host_to_net_u16 (port_host_order),
+				    sst);
+
+  if (listener)
+    return VNET_API_ERROR_ADDRESS_IN_USE;
+
+  if (application_lookup (api_client_index))
+    {
+      clib_warning ("Only one bind supported for now");
+      return VNET_API_ERROR_ADDRESS_IN_USE;
+    }
+
+  is_ip4 = SESSION_TYPE_IP4_UDP == sst || SESSION_TYPE_IP4_TCP == sst;
+  if (!ip_is_zero (ip46, is_ip4) && !ip_is_local (ip46, is_ip4))
+    return VNET_API_ERROR_INVALID_VALUE;
+
+  /* Allocate and initialize stream server */
+  server = application_new (APP_SERVER, sst, api_client_index,
+			    options[SESSION_OPTIONS_FLAGS], cb_fns);
+
+  application_server_init (server, options[SESSION_OPTIONS_SEGMENT_SIZE],
+			   options[SESSION_OPTIONS_ADD_SEGMENT_SIZE],
+			   options[SESSION_OPTIONS_RX_FIFO_SIZE],
+			   options[SESSION_OPTIONS_TX_FIFO_SIZE],
+			   &segment_name);
+
+  /* Setup listen path down to transport */
+  stream_session_start_listen (server->index, ip46, port_host_order);
+
+  /*
+   * Return values
+   */
+
+  ASSERT (vec_len (segment_name) <= 128);
+  *len_seg_name = vec_len (segment_name);
+  memcpy (seg_name, segment_name, *len_seg_name);
+  *app = server;
+
+  return 0;
+}
+
+int
+vnet_unbind_i (u32 api_client_index)
+{
+  application_t *server;
+
+  /*
+   * Find the stream_server_t corresponding to the api client
+   */
+  server = application_lookup (api_client_index);
+  if (!server)
+    return VNET_API_ERROR_INVALID_VALUE_2;
+
+  /* Clear the listener */
+  stream_session_stop_listen (server->index);
+  application_del (server);
+
+  return 0;
+}
+
+int
+vnet_connect_i (u32 api_client_index, u32 api_context, session_type_t sst,
+		ip46_address_t * ip46, u16 port, u64 * options, void *mp,
+		session_cb_vft_t * cb_fns)
+{
+  stream_session_t *listener;
+  application_t *server, *app;
+
+  /*
+   * Figure out if connecting to a local server
+   */
+  listener = stream_session_lookup_listener (ip46,
+					     clib_host_to_net_u16 (port),
+					     sst);
+  if (listener)
+    {
+      server = application_get (listener->app_index);
+
+      /*
+       * Server is willing to have a direct fifo connection created
+       * instead of going through the state machine, etc.
+       */
+      if (server->flags & SESSION_OPTIONS_FLAGS_USE_FIFO)
+	return server->cb_fns.
+	  redirect_connect_callback (server->api_client_index, mp);
+    }
+
+  /* Create client app */
+  app = application_new (APP_CLIENT, sst, api_client_index,
+			 options[SESSION_OPTIONS_FLAGS], cb_fns);
+
+  app->api_context = api_context;
+
+  /*
+   * Not connecting to a local server. Create regular session
+   */
+  stream_session_open (sst, ip46, port, app->index);
+
+  return 0;
+}
+
+/**
+ * unformat a vnet URI
+ *
+ * fifo://name
+ * tcp://ip46-addr:port
+ * udp://ip46-addr:port
+ *
+ * u8 ip46_address[16];
+ * u16  port_in_host_byte_order;
+ * stream_session_type_t sst;
+ * u8 *fifo_name;
+ *
+ * if (unformat (input, "%U", unformat_vnet_uri, &ip46_address,
+ *              &sst, &port, &fifo_name))
+ *  etc...
+ *
+ */
+uword
+unformat_vnet_uri (unformat_input_t * input, va_list * args)
+{
+  ip46_address_t *address = va_arg (*args, ip46_address_t *);
+  session_type_t *sst = va_arg (*args, session_type_t *);
+  u16 *port = va_arg (*args, u16 *);
+
+  if (unformat (input, "tcp://%U/%d", unformat_ip4_address, &address->ip4,
+		port))
+    {
+      *sst = SESSION_TYPE_IP4_TCP;
+      return 1;
+    }
+  if (unformat (input, "udp://%U/%d", unformat_ip4_address, &address->ip4,
+		port))
+    {
+      *sst = SESSION_TYPE_IP4_UDP;
+      return 1;
+    }
+  if (unformat (input, "udp://%U/%d", unformat_ip6_address, &address->ip6,
+		port))
+    {
+      *sst = SESSION_TYPE_IP6_UDP;
+      return 1;
+    }
+  if (unformat (input, "tcp://%U/%d", unformat_ip6_address, &address->ip6,
+		port))
+    {
+      *sst = SESSION_TYPE_IP6_TCP;
+      return 1;
+    }
+
+  return 0;
+}
+
+int
+parse_uri (char *uri, session_type_t * sst, ip46_address_t * addr,
+	   u16 * port_number_host_byte_order)
+{
+  unformat_input_t _input, *input = &_input;
+
+  /* Make sure */
+  uri = (char *) format (0, "%s%c", uri, 0);
+
+  /* Parse uri */
+  unformat_init_string (input, uri, strlen (uri));
+  if (!unformat (input, "%U", unformat_vnet_uri, addr, sst,
+		 port_number_host_byte_order))
+    {
+      unformat_free (input);
+      return VNET_API_ERROR_INVALID_VALUE;
+    }
+  unformat_free (input);
+
+  return 0;
+}
+
+int
+vnet_bind_uri (vnet_bind_args_t * a)
+{
+  application_t *server = 0;
+  u16 port_host_order;
+  session_type_t sst = SESSION_N_TYPES;
+  ip46_address_t ip46;
+  int rv;
+
+  memset (&ip46, 0, sizeof (ip46));
+  rv = parse_uri (a->uri, &sst, &ip46, &port_host_order);
+  if (rv)
+    return rv;
+
+  if ((rv = vnet_bind_i (a->api_client_index, &ip46, port_host_order, sst,
+			 a->options, a->session_cb_vft, &server,
+			 &a->segment_name_length, a->segment_name)))
+    return rv;
+
+  a->server_event_queue_address = (u64) server->event_queue;
+  return 0;
+}
+
+session_type_t
+session_type_from_proto_and_ip (session_api_proto_t proto, u8 is_ip4)
+{
+  if (proto == SESSION_PROTO_TCP)
+    {
+      if (is_ip4)
+	return SESSION_TYPE_IP4_TCP;
+      else
+	return SESSION_TYPE_IP6_TCP;
+    }
+  else
+    {
+      if (is_ip4)
+	return SESSION_TYPE_IP4_UDP;
+      else
+	return SESSION_TYPE_IP6_UDP;
+    }
+
+  return SESSION_N_TYPES;
+}
+
+int
+vnet_unbind_uri (char *uri, u32 api_client_index)
+{
+  u16 port_number_host_byte_order;
+  session_type_t sst = SESSION_N_TYPES;
+  ip46_address_t ip46_address;
+  stream_session_t *listener;
+  int rv;
+
+  rv = parse_uri (uri, &sst, &ip46_address, &port_number_host_byte_order);
+  if (rv)
+    return rv;
+
+  listener =
+    stream_session_lookup_listener (&ip46_address,
+				    clib_host_to_net_u16
+				    (port_number_host_byte_order), sst);
+
+  if (!listener)
+    return VNET_API_ERROR_ADDRESS_NOT_IN_USE;
+
+  /* External client? */
+  if (api_client_index != ~0)
+    {
+      ASSERT (vl_api_client_index_to_registration (api_client_index));
+    }
+
+  return vnet_unbind_i (api_client_index);
+}
+
+int
+vnet_connect_uri (vnet_connect_args_t * a)
+{
+  ip46_address_t ip46_address;
+  u16 port;
+  session_type_t sst;
+  application_t *app;
+  int rv;
+
+  app = application_lookup (a->api_client_index);
+  if (app)
+    {
+      clib_warning ("Already have a connect from this app");
+      return VNET_API_ERROR_INVALID_VALUE_2;
+    }
+
+  /* Parse uri */
+  rv = parse_uri (a->uri, &sst, &ip46_address, &port);
+  if (rv)
+    return rv;
+
+  return vnet_connect_i (a->api_client_index, a->api_context, sst,
+			 &ip46_address, port, a->options, a->mp,
+			 a->session_cb_vft);
+}
+
+int
+vnet_disconnect_session (u32 client_index, u32 session_index,
+			 u32 thread_index)
+{
+  stream_session_t *session;
+
+  session = stream_session_get (session_index, thread_index);
+  stream_session_disconnect (session);
+
+  return 0;
+}
+
+
+int
+vnet_bind (vnet_bind_args_t * a)
+{
+  application_t *server = 0;
+  session_type_t sst = SESSION_N_TYPES;
+  int rv;
+
+  sst = session_type_from_proto_and_ip (a->proto, a->tep.is_ip4);
+  if ((rv = vnet_bind_i (a->api_client_index, &a->tep.ip, a->tep.port, sst,
+			 a->options, a->session_cb_vft, &server,
+			 &a->segment_name_length, a->segment_name)))
+    return rv;
+
+  a->server_event_queue_address = (u64) server->event_queue;
+  a->handle = (u64) a->tep.vrf << 32 | (u64) server->session_index;
+  return 0;
+}
+
+int
+vnet_unbind (vnet_unbind_args_t * a)
+{
+  application_t *server;
+
+  if (a->api_client_index != ~0)
+    {
+      ASSERT (vl_api_client_index_to_registration (a->api_client_index));
+    }
+
+  /* Make sure this is the right one */
+  server = application_lookup (a->api_client_index);
+  ASSERT (server->session_index == (0xFFFFFFFF & a->handle));
+
+  /* TODO use handle to disambiguate namespaces/vrfs */
+  return vnet_unbind_i (a->api_client_index);
+}
+
+int
+vnet_connect (vnet_connect_args_t * a)
+{
+  session_type_t sst;
+  application_t *app;
+
+  app = application_lookup (a->api_client_index);
+  if (app)
+    {
+      clib_warning ("Already have a connect from this app");
+      return VNET_API_ERROR_INVALID_VALUE_2;
+    }
+
+  sst = session_type_from_proto_and_ip (a->proto, a->tep.is_ip4);
+  return vnet_connect_i (a->api_client_index, a->api_context, sst, &a->tep.ip,
+			 a->tep.port, a->options, a->mp, a->session_cb_vft);
+}
+
+int
+vnet_disconnect (vnet_disconnect_args_t * a)
+{
+  stream_session_t *session;
+  u32 session_index, thread_index;
+
+  if (api_parse_session_handle (a->handle, &session_index, &thread_index))
+    {
+      clib_warning ("Invalid handle");
+      return -1;
+    }
+
+  session = stream_session_get (session_index, thread_index);
+  stream_session_disconnect (session);
+
+  return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */