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-rw-r--r--src/vnet/session/application_interface.c406
1 files changed, 406 insertions, 0 deletions
diff --git a/src/vnet/session/application_interface.c b/src/vnet/session/application_interface.c
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+/*
+ * 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_t));
+ 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 app_index, session_type_t sst,
+ transport_endpoint_t * tep, u64 * handle)
+{
+ application_t *app;
+ stream_session_t *listener;
+
+ app = application_get_if_valid (app_index);
+ if (!app)
+ {
+ clib_warning ("app not attached");
+ return VNET_API_ERROR_APPLICATION_NOT_ATTACHED;
+ }
+
+ listener = stream_session_lookup_listener (&tep->ip, tep->port, sst);
+ if (listener)
+ return VNET_API_ERROR_ADDRESS_IN_USE;
+
+ if (!ip_is_zero (&tep->ip, tep->is_ip4)
+ && !ip_is_local (&tep->ip, tep->is_ip4))
+ return VNET_API_ERROR_INVALID_VALUE_2;
+
+ /* Setup listen path down to transport */
+ return application_start_listen (app, sst, tep, handle);
+}
+
+int
+vnet_unbind_i (u32 app_index, u64 handle)
+{
+ application_t *app = application_get_if_valid (app_index);
+
+ if (!app)
+ {
+ clib_warning ("app (%d) not attached", app_index);
+ return VNET_API_ERROR_APPLICATION_NOT_ATTACHED;
+ }
+
+ /* Clear the listener */
+ return application_stop_listen (app, handle);
+}
+
+int
+vnet_connect_i (u32 app_index, u32 api_context, session_type_t sst,
+ transport_endpoint_t * tep, void *mp)
+{
+ stream_session_t *listener;
+ application_t *server, *app;
+
+ /*
+ * Figure out if connecting to a local server
+ */
+ listener = stream_session_lookup_listener (&tep->ip, tep->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 & APP_OPTIONS_FLAGS_USE_FIFO)
+ return server->cb_fns.
+ redirect_connect_callback (server->api_client_index, mp);
+ }
+
+ /*
+ * Not connecting to a local server. Create regular session
+ */
+ app = application_get (app_index);
+ return application_open_session (app, sst, tep, api_context);
+}
+
+/**
+ * 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)
+{
+ session_type_t *sst = va_arg (*args, session_type_t *);
+ transport_endpoint_t *tep = va_arg (*args, transport_endpoint_t *);
+
+ if (unformat (input, "tcp://%U/%d", unformat_ip4_address, &tep->ip.ip4,
+ &tep->port))
+ {
+ *sst = SESSION_TYPE_IP4_TCP;
+ tep->port = clib_host_to_net_u16 (tep->port);
+ tep->is_ip4 = 1;
+ return 1;
+ }
+ if (unformat (input, "udp://%U/%d", unformat_ip4_address, &tep->ip.ip4,
+ &tep->port))
+ {
+ *sst = SESSION_TYPE_IP4_UDP;
+ tep->port = clib_host_to_net_u16 (tep->port);
+ tep->is_ip4 = 1;
+ return 1;
+ }
+ if (unformat (input, "udp://%U/%d", unformat_ip6_address, &tep->ip.ip6,
+ &tep->port))
+ {
+ *sst = SESSION_TYPE_IP6_UDP;
+ tep->port = clib_host_to_net_u16 (tep->port);
+ return 1;
+ }
+ if (unformat (input, "tcp://%U/%d", unformat_ip6_address, &tep->ip.ip6,
+ &tep->port))
+ {
+ *sst = SESSION_TYPE_IP6_TCP;
+ tep->port = clib_host_to_net_u16 (tep->port);
+ return 1;
+ }
+
+ return 0;
+}
+
+static u8 *cache_uri;
+static session_type_t cache_sst;
+static transport_endpoint_t *cache_tep;
+
+int
+parse_uri (char *uri, session_type_t * sst, transport_endpoint_t * tep)
+{
+ unformat_input_t _input, *input = &_input;
+
+ if (cache_uri && !strncmp (uri, (char *) cache_uri, vec_len (cache_uri)))
+ {
+ *sst = cache_sst;
+ *tep = *cache_tep;
+ return 0;
+ }
+
+ /* 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, sst, tep))
+ {
+ unformat_free (input);
+ return VNET_API_ERROR_INVALID_VALUE;
+ }
+ unformat_free (input);
+
+ vec_free (cache_uri);
+ cache_uri = (u8 *) uri;
+ cache_sst = *sst;
+ if (cache_tep)
+ clib_mem_free (cache_tep);
+ cache_tep = clib_mem_alloc (sizeof (*tep));
+ *cache_tep = *tep;
+
+ return 0;
+}
+
+/**
+ * Attaches application.
+ *
+ * Allocates a vpp app, i.e., a structure that keeps back pointers
+ * to external app and a segment manager for shared memory fifo based
+ * communication with the external app.
+ */
+int
+vnet_application_attach (vnet_app_attach_args_t * a)
+{
+ application_t *app = 0;
+ segment_manager_t *sm;
+ u8 *seg_name;
+ int rv;
+
+ app = application_new ();
+ if ((rv = application_init (app, a->api_client_index, a->options,
+ a->session_cb_vft)))
+ return rv;
+
+ a->app_event_queue_address = pointer_to_uword (app->event_queue);
+ sm = segment_manager_get (app->first_segment_manager);
+ segment_manager_get_segment_info (sm->segment_indices[0],
+ &seg_name, &a->segment_size);
+
+ a->segment_name_length = vec_len (seg_name);
+ a->segment_name = seg_name;
+ ASSERT (vec_len (a->segment_name) <= 128);
+ a->app_index = app->index;
+ return 0;
+}
+
+int
+vnet_application_detach (vnet_app_detach_args_t * a)
+{
+ application_t *app;
+ app = application_get_if_valid (a->app_index);
+
+ if (!app)
+ {
+ clib_warning ("app not attached");
+ return VNET_API_ERROR_APPLICATION_NOT_ATTACHED;
+ }
+
+ application_del (app);
+ return 0;
+}
+
+int
+vnet_bind_uri (vnet_bind_args_t * a)
+{
+ session_type_t sst = SESSION_N_TYPES;
+ transport_endpoint_t tep;
+ int rv;
+
+ memset (&tep, 0, sizeof (tep));
+ rv = parse_uri (a->uri, &sst, &tep);
+ if (rv)
+ return rv;
+
+ if ((rv = vnet_bind_i (a->app_index, sst, &tep, &a->handle)))
+ return rv;
+
+ return 0;
+}
+
+int
+vnet_unbind_uri (vnet_unbind_args_t * a)
+{
+ session_type_t sst = SESSION_N_TYPES;
+ stream_session_t *listener;
+ transport_endpoint_t tep;
+ int rv;
+
+ rv = parse_uri (a->uri, &sst, &tep);
+ if (rv)
+ return rv;
+
+ listener = stream_session_lookup_listener (&tep.ip,
+ clib_host_to_net_u16 (tep.port),
+ sst);
+ if (!listener)
+ return VNET_API_ERROR_ADDRESS_NOT_IN_USE;
+
+ return vnet_unbind_i (a->app_index, listen_session_get_handle (listener));
+}
+
+int
+vnet_connect_uri (vnet_connect_args_t * a)
+{
+ transport_endpoint_t tep;
+ session_type_t sst;
+ int rv;
+
+ /* Parse uri */
+ memset (&tep, 0, sizeof (tep));
+ rv = parse_uri (a->uri, &sst, &tep);
+ if (rv)
+ return rv;
+
+ return vnet_connect_i (a->app_index, a->api_context, sst, &tep, a->mp);
+}
+
+int
+vnet_disconnect_session (vnet_disconnect_args_t * a)
+{
+ u32 index, thread_index;
+ stream_session_t *s;
+
+ stream_session_parse_handle (a->handle, &index, &thread_index);
+ s = stream_session_get_if_valid (index, thread_index);
+
+ if (!s || s->app_index != a->app_index)
+ return VNET_API_ERROR_INVALID_VALUE;
+
+ /* We're peeking into another's thread pool. Make sure */
+ ASSERT (s->session_index == index);
+
+ session_send_session_evt_to_thread (a->handle, FIFO_EVENT_DISCONNECT,
+ thread_index);
+ return 0;
+}
+
+int
+vnet_bind (vnet_bind_args_t * a)
+{
+ 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->app_index, sst, &a->tep, &a->handle)))
+ return rv;
+
+ return 0;
+}
+
+int
+vnet_unbind (vnet_unbind_args_t * a)
+{
+ return vnet_unbind_i (a->app_index, a->handle);
+}
+
+int
+vnet_connect (vnet_connect_args_t * a)
+{
+ session_type_t sst;
+
+ sst = session_type_from_proto_and_ip (a->proto, a->tep.is_ip4);
+ return vnet_connect_i (a->app_index, a->api_context, sst, &a->tep, a->mp);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */