/*
- * 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:
* limitations under the License.
*/
#include <vnet/session/application_interface.h>
-
+#include <vnet/session/application.h>
#include <vnet/session/session.h>
-#include <vlibmemory/api.h>
-#include <vnet/dpo/load_balance.h>
/** @file
VPP's application/session API bind/unbind/connect/disconnect calls
*/
-/*
- * TLS server cert and keys to be used for testing only
- */
-const char test_srv_crt_rsa[] =
- "-----BEGIN CERTIFICATE-----\r\n"
- "MIID5zCCAs+gAwIBAgIJALeMYCEHrTtJMA0GCSqGSIb3DQEBCwUAMIGJMQswCQYD\r\n"
- "VQQGEwJVUzELMAkGA1UECAwCQ0ExETAPBgNVBAcMCFNhbiBKb3NlMQ4wDAYDVQQK\r\n"
- "DAVDaXNjbzEOMAwGA1UECwwFZmQuaW8xFjAUBgNVBAMMDXRlc3R0bHMuZmQuaW8x\r\n"
- "IjAgBgkqhkiG9w0BCQEWE3ZwcC1kZXZAbGlzdHMuZmQuaW8wHhcNMTgwMzA1MjEx\r\n"
- "NTEyWhcNMjgwMzAyMjExNTEyWjCBiTELMAkGA1UEBhMCVVMxCzAJBgNVBAgMAkNB\r\n"
- "MREwDwYDVQQHDAhTYW4gSm9zZTEOMAwGA1UECgwFQ2lzY28xDjAMBgNVBAsMBWZk\r\n"
- "LmlvMRYwFAYDVQQDDA10ZXN0dGxzLmZkLmlvMSIwIAYJKoZIhvcNAQkBFhN2cHAt\r\n"
- "ZGV2QGxpc3RzLmZkLmlvMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA\r\n"
- "4C1k8a1DuStgggqT4o09fP9sJ2dC54bxhS/Xk2VEfaIZ222WSo4X/syRVfVy9Yah\r\n"
- "cpI1zJ/RDxaZSFhgA+nPZBrFMsrULkrdAOpOVj8eDEp9JuWdO2ODSoFnCvLxcYWB\r\n"
- "Yc5kHryJpEaGJl1sFQSesnzMFty/59ta0stk0Fp8r5NhIjWvSovGzPo6Bhz+VS2c\r\n"
- "ebIZh4x1t2hHaFcgm0qJoJ6DceReWCW8w+yOVovTolGGq+bpb2Hn7MnRSZ2K2NdL\r\n"
- "+aLXpkZbS/AODP1FF2vTO1mYL290LO7/51vJmPXNKSDYMy5EvILr5/VqtjsFCwRL\r\n"
- "Q4jcM/+GeHSAFWx4qIv0BwIDAQABo1AwTjAdBgNVHQ4EFgQUWa1SOB37xmT53tZQ\r\n"
- "aXuLLhRI7U8wHwYDVR0jBBgwFoAUWa1SOB37xmT53tZQaXuLLhRI7U8wDAYDVR0T\r\n"
- "BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEAoUht13W4ya27NVzQuCMvqPWL3VM4\r\n"
- "3xbPFk02FaGz/WupPu276zGlzJAZrbuDcQowwwU1Ni1Yygxl96s1c2M5rHDTrOKG\r\n"
- "rK0hbkSFBo+i6I8u4HiiQ4rYmG0Hv6+sXn3of0HsbtDPGgWZoipPWDljPYEURu3e\r\n"
- "3HRe/Dtsj9CakBoSDzs8ndWaBR+f4sM9Tk1cjD46Gq2T/qpSPXqKxEUXlzhdCAn4\r\n"
- "twub17Bq2kykHpppCwPg5M+v30tHG/R2Go15MeFWbEJthFk3TZMjKL7UFs7fH+x2\r\n"
- "wSonXb++jY+KmCb93C+soABBizE57g/KmiR2IxQ/LMjDik01RSUIaM0lLA==\r\n"
- "-----END CERTIFICATE-----\r\n";
-const u32 test_srv_crt_rsa_len = sizeof (test_srv_crt_rsa);
-
-const char test_srv_key_rsa[] =
- "-----BEGIN PRIVATE KEY-----\r\n"
- "MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDgLWTxrUO5K2CC\r\n"
- "CpPijT18/2wnZ0LnhvGFL9eTZUR9ohnbbZZKjhf+zJFV9XL1hqFykjXMn9EPFplI\r\n"
- "WGAD6c9kGsUyytQuSt0A6k5WPx4MSn0m5Z07Y4NKgWcK8vFxhYFhzmQevImkRoYm\r\n"
- "XWwVBJ6yfMwW3L/n21rSy2TQWnyvk2EiNa9Ki8bM+joGHP5VLZx5shmHjHW3aEdo\r\n"
- "VyCbSomgnoNx5F5YJbzD7I5Wi9OiUYar5ulvYefsydFJnYrY10v5otemRltL8A4M\r\n"
- "/UUXa9M7WZgvb3Qs7v/nW8mY9c0pINgzLkS8guvn9Wq2OwULBEtDiNwz/4Z4dIAV\r\n"
- "bHioi/QHAgMBAAECggEBAMzGipP8+oT166U+NlJXRFifFVN1DvdhG9PWnOxGL+c3\r\n"
- "ILmBBC08WQzmHshPemBvR6DZkA1H23cV5JTiLWrFtC00CvhXsLRMrE5+uWotI6yE\r\n"
- "iofybMroHvD6/X5R510UX9hQ6MHu5ShLR5VZ9zXHz5MpTmB/60jG5dLx+jgcwBK8\r\n"
- "LuGv2YB/WCUwT9QJ3YU2eaingnXtz/MrFbkbltrqlnBdlD+kTtw6Yac9y1XuuQXc\r\n"
- "BPeulLNDuPolJVWbUvDBZrpt2dXTgz8ws1sv+wCNE0xwQJsqW4Nx3QkpibUL9RUr\r\n"
- "CVbKlNfa9lopT6nGKlgX69R/uH35yh9AOsfasro6w0ECgYEA82UJ8u/+ORah+0sF\r\n"
- "Q0FfW5MTdi7OAUHOz16pUsGlaEv0ERrjZxmAkHA/VRwpvDBpx4alCv0Hc39PFLIk\r\n"
- "nhSsM2BEuBkTAs6/GaoNAiBtQVE/hN7awNRWVmlieS0go3Y3dzaE9IUMyj8sPOFT\r\n"
- "5JdJ6BM69PHKCkY3dKdnnfpFEuECgYEA68mRpteunF1mdZgXs+WrN+uLlRrQR20F\r\n"
- "ZyMYiUCH2Dtn26EzA2moy7FipIIrQcX/j+KhYNGM3e7MU4LymIO29E18mn8JODnH\r\n"
- "sQOXzBTsf8A4yIVMkcuQD3bfb0JiUGYUPOidTp2N7IJA7+6Yc3vQOyb74lnKnJoO\r\n"
- "gougPT2wS+cCgYAn7muzb6xFsXDhyW0Tm6YJYBfRS9yAWEuVufINobeBZPSl2cN1\r\n"
- "Jrnw+HlrfTNbrJWuJmjtZJXUXQ6cVp2rUbjutNyRV4vG6iRwEXYQ40EJdkr1gZpi\r\n"
- "CHQhuShuuPih2MNAy7EEbM+sXrDjTBR3bFqzuHPzu7dp+BshCFX3lRfAAQKBgGQt\r\n"
- "K5i7IhCFDjb/+3IPLgOAK7mZvsvZ4eXD33TQ2eZgtut1PXtBtNl17/b85uv293Fm\r\n"
- "VDISVcsk3eLNS8zIiT6afUoWlxAwXEs0v5WRfjl4radkGvgGiJpJYvyeM67877RB\r\n"
- "EDSKc/X8ESLfOB44iGvZUEMG6zJFscx9DgN25iQZAoGAbyd+JEWwdVH9/K3IH1t2\r\n"
- "PBkZX17kNWv+iVM1WyFjbe++vfKZCrOJiyiqhDeEqgrP3AuNMlaaduC3VRC3G5oV\r\n"
- "Mj1tlhDWQ/qhvKdCKNdIVQYDE75nw+FRWV8yYkHAnXYW3tNoweDIwixE0hkPR1bc\r\n"
- "oEjPLVNtx8SOj/M4rhaPT3I=\r\n" "-----END PRIVATE KEY-----\r\n";
-const u32 test_srv_key_rsa_len = sizeof (test_srv_key_rsa);
-
-static u8
-session_endpoint_is_local (session_endpoint_t * sep)
-{
- return (ip_is_zero (&sep->ip, sep->is_ip4)
- || ip_is_local_host (&sep->ip, sep->is_ip4));
-}
-
-static u8
-session_endpoint_is_zero (session_endpoint_t * sep)
-{
- return ip_is_zero (&sep->ip, sep->is_ip4);
-}
-
-u8
-session_endpoint_in_ns (session_endpoint_t * sep)
-{
- u8 is_lep = session_endpoint_is_local (sep);
- if (!is_lep && sep->sw_if_index != ENDPOINT_INVALID_INDEX
- && !ip_interface_has_address (sep->sw_if_index, &sep->ip, sep->is_ip4))
- {
- clib_warning ("sw_if_index %u not configured with ip %U",
- sep->sw_if_index, format_ip46_address, &sep->ip,
- sep->is_ip4);
- return 0;
- }
- return (is_lep || ip_is_local (sep->fib_index, &sep->ip, sep->is_ip4));
-}
-
-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;
-}
-
-static void
-session_endpoint_update_for_app (session_endpoint_t * sep,
- application_t * app)
-{
- app_namespace_t *app_ns;
- app_ns = app_namespace_get (app->ns_index);
- if (app_ns)
- {
- /* Ask transport and network to bind to/connect using local interface
- * that "supports" app's namespace. This will fix our local connection
- * endpoint.
- */
- sep->sw_if_index = app_ns->sw_if_index;
- sep->fib_index =
- sep->is_ip4 ? app_ns->ip4_fib_index : app_ns->ip6_fib_index;
- }
-}
-
-static int
-vnet_bind_i (u32 app_index, session_endpoint_t * sep, u64 * handle)
-{
- u64 lh, ll_handle = SESSION_INVALID_HANDLE;
- application_t *app;
- u32 table_index;
- int rv;
-
- app = application_get_if_valid (app_index);
- if (!app)
- {
- SESSION_DBG ("app not attached");
- return VNET_API_ERROR_APPLICATION_NOT_ATTACHED;
- }
-
- session_endpoint_update_for_app (sep, app);
- if (!session_endpoint_in_ns (sep))
- return VNET_API_ERROR_INVALID_VALUE_2;
-
- table_index = application_session_table (app,
- session_endpoint_fib_proto (sep));
- lh = session_lookup_endpoint_listener (table_index, sep, 1);
- if (lh != SESSION_INVALID_HANDLE)
- return VNET_API_ERROR_ADDRESS_IN_USE;
-
- /*
- * Add session endpoint to local session table. Only binds to "inaddr_any"
- * (i.e., zero address) are added to local scope table.
- */
- if (application_has_local_scope (app) && session_endpoint_is_local (sep))
- {
- if ((rv = application_start_local_listen (app, sep, handle)))
- return rv;
- ll_handle = *handle;
- }
-
- if (!application_has_global_scope (app))
- return (ll_handle == SESSION_INVALID_HANDLE ? -1 : 0);
-
- /*
- * Add session endpoint to global session table
- */
-
- /* Setup listen path down to transport */
- rv = application_start_listen (app, sep, handle);
- if (rv && ll_handle != SESSION_INVALID_HANDLE)
- session_lookup_del_session_endpoint (table_index, sep);
-
- /*
- * Store in local table listener the index of the transport layer
- * listener. We'll need local listeners are hit and we need to
- * return global handle
- */
- if (ll_handle != SESSION_INVALID_HANDLE)
- {
- local_session_t *ll;
- stream_session_t *tl;
- ll = application_get_local_listener_w_handle (ll_handle);
- tl = listen_session_get_from_handle (*handle);
- ll->transport_listener_index = tl->session_index;
- }
- return rv;
-}
-
-int
-vnet_unbind_i (u32 app_index, session_handle_t handle)
-{
- application_t *app;
- int rv;
-
- if (!(app = application_get_if_valid (app_index)))
- {
- SESSION_DBG ("app (%d) not attached", app_index);
- return VNET_API_ERROR_APPLICATION_NOT_ATTACHED;
- }
-
- if (application_has_local_scope (app))
- {
- if ((rv = application_stop_local_listen (app, handle)))
- return rv;
- }
-
- /*
- * Clear the global scope table of the listener
- */
- if (application_has_global_scope (app))
- return application_stop_listen (app, handle);
- return 0;
-}
-
-int
-application_connect (u32 client_index, u32 api_context,
- session_endpoint_t * sep)
-{
- application_t *server, *client;
- u32 table_index, server_index, li;
- stream_session_t *listener;
- local_session_t *ll;
- u64 lh;
-
- if (session_endpoint_is_zero (sep))
- return VNET_API_ERROR_INVALID_VALUE;
-
- client = application_get (client_index);
- session_endpoint_update_for_app (sep, client);
-
- /*
- * First check the local scope for locally attached destinations.
- * If we have local scope, we pass *all* connects through it since we may
- * have special policy rules even for non-local destinations, think proxy.
- */
- if (application_has_local_scope (client))
- {
- table_index = application_local_session_table (client);
- lh = session_lookup_local_endpoint (table_index, sep);
- if (lh == SESSION_DROP_HANDLE)
- return VNET_API_ERROR_APP_CONNECT_FILTERED;
-
- if (lh == SESSION_INVALID_HANDLE)
- goto global_scope;
-
- local_session_parse_handle (lh, &server_index, &li);
-
- /*
- * Break loop if rule in local table points to connecting app. This
- * can happen if client is a generic proxy. Route connect through
- * global table instead.
- */
- if (server_index != client_index)
- {
- server = application_get (server_index);
- ll = application_get_local_listen_session (server, li);
- return application_local_session_connect (table_index, client,
- server, ll, api_context);
- }
- }
-
- /*
- * If nothing found, check the global scope for locally attached
- * destinations. Make sure first that we're allowed to.
- */
-
-global_scope:
- if (session_endpoint_is_local (sep))
- return VNET_API_ERROR_SESSION_CONNECT;
-
- if (!application_has_global_scope (client))
- return VNET_API_ERROR_APP_CONNECT_SCOPE;
-
- table_index = application_session_table (client,
- session_endpoint_fib_proto (sep));
- listener = session_lookup_listener (table_index, sep);
- if (listener)
- {
- server = application_get (listener->app_index);
- if (server)
- return application_local_session_connect (table_index, client, server,
- (local_session_t *)
- listener, api_context);
- }
-
- /*
- * Not connecting to a local server, propagate to transport
- */
- if (application_open_session (client, sep, api_context))
- return VNET_API_ERROR_SESSION_CONNECT;
- return 0;
-}
-
/**
* unformat a vnet URI
*
uword
unformat_vnet_uri (unformat_input_t * input, va_list * args)
{
- session_endpoint_extended_t *sep = va_arg (*args,
- session_endpoint_extended_t *);
+ session_endpoint_cfg_t *sep = va_arg (*args, session_endpoint_cfg_t *);
u32 transport_proto = 0, port;
if (unformat (input, "%U://%U/%d", unformat_transport_proto,
sep->is_ip4 = 0;
return 1;
}
+ else if (unformat (input, "%U://session/%lu", unformat_transport_proto,
+ &transport_proto, &sep->parent_handle))
+ {
+ sep->transport_proto = transport_proto;
+ sep->ip.ip4.as_u32 = 1; /* ip need to be non zero in vnet */
+ return 1;
+ }
return 0;
}
static u8 *cache_uri;
-static session_endpoint_extended_t *cache_sep;
+static session_endpoint_cfg_t *cache_sep;
int
-parse_uri (char *uri, session_endpoint_extended_t * sep)
+parse_uri (char *uri, session_endpoint_cfg_t * sep)
{
unformat_input_t _input, *input = &_input;
return 0;
}
-static int
-session_validate_namespace (u8 * namespace_id, u64 secret, u32 * app_ns_index)
-{
- app_namespace_t *app_ns;
- if (vec_len (namespace_id) == 0)
- {
- /* Use default namespace */
- *app_ns_index = 0;
- return 0;
- }
-
- *app_ns_index = app_namespace_index_from_id (namespace_id);
- if (*app_ns_index == APP_NAMESPACE_INVALID_INDEX)
- return VNET_API_ERROR_APP_INVALID_NS;
- app_ns = app_namespace_get (*app_ns_index);
- if (!app_ns)
- return VNET_API_ERROR_APP_INVALID_NS;
- if (app_ns->ns_secret != secret)
- return VNET_API_ERROR_APP_WRONG_NS_SECRET;
- return 0;
-}
-
-/**
- * Attach application to vpp
- *
- * 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.
- */
-clib_error_t *
-vnet_application_attach (vnet_app_attach_args_t * a)
-{
- svm_fifo_segment_private_t *fs;
- application_t *app = 0;
- segment_manager_t *sm;
- u32 app_ns_index = 0;
- u64 secret;
- int rv;
-
- if (a->api_client_index != APP_INVALID_INDEX)
- app = application_lookup (a->api_client_index);
- else if (a->name)
- app = application_lookup_name (a->name);
- else
- return clib_error_return_code (0, VNET_API_ERROR_INVALID_VALUE, 0,
- "api index or name must be provided");
-
- if (app)
- return clib_error_return_code (0, VNET_API_ERROR_APP_ALREADY_ATTACHED, 0,
- "app already attached");
-
- secret = a->options[APP_OPTIONS_NAMESPACE_SECRET];
- if ((rv = session_validate_namespace (a->namespace_id, secret,
- &app_ns_index)))
- return clib_error_return_code (0, rv, 0, "namespace validation: %d", rv);
- a->options[APP_OPTIONS_NAMESPACE] = app_ns_index;
- app = application_new ();
- if ((rv = application_init (app, a->api_client_index, a->name, a->options,
- a->session_cb_vft)))
- return clib_error_return_code (0, rv, 0, "app init: %d", rv);
-
- a->app_event_queue_address = pointer_to_uword (app->event_queue);
- sm = segment_manager_get (app->first_segment_manager);
- fs = segment_manager_get_segment_w_lock (sm, 0);
-
- if (application_is_proxy (app))
- application_setup_proxy (app);
-
- ASSERT (vec_len (fs->ssvm.name) <= 128);
- a->segment = &fs->ssvm;
- a->app_index = app->index;
-
- segment_manager_segment_reader_unlock (sm);
-
- return 0;
-}
-
-/**
- * Detach application from vpp
- */
int
-vnet_application_detach (vnet_app_detach_args_t * a)
+vnet_bind_uri (vnet_listen_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_endpoint_extended_t sep = SESSION_ENDPOINT_EXT_NULL;
+ session_endpoint_cfg_t sep = SESSION_ENDPOINT_CFG_NULL;
int rv;
rv = parse_uri (a->uri, &sep);
if (rv)
return rv;
-
- return vnet_bind_i (a->app_index, (session_endpoint_t *) & sep, &a->handle);
+ sep.app_wrk_index = 0;
+ clib_memcpy (&a->sep_ext, &sep, sizeof (sep));
+ return vnet_listen (a);
}
int
-vnet_unbind_uri (vnet_unbind_args_t * a)
+vnet_unbind_uri (vnet_unlisten_args_t * a)
{
- session_endpoint_extended_t sep = SESSION_ENDPOINT_EXT_NULL;
- stream_session_t *listener;
+ session_endpoint_cfg_t sep = SESSION_ENDPOINT_CFG_NULL;
+ application_t *app;
+ session_t *listener;
u32 table_index;
int rv;
- rv = parse_uri (a->uri, &sep);
- if (rv)
+ if ((rv = parse_uri (a->uri, &sep)))
return rv;
- /* NOTE: only default fib tables supported for uri apis */
- table_index = session_lookup_get_index_for_fib (fib_ip_proto (!sep.is_ip4),
- 0);
+ app = application_get (a->app_index);
+ if (!app)
+ return VNET_API_ERROR_INVALID_VALUE;
+
+ table_index = application_session_table (app, fib_ip_proto (!sep.is_ip4));
listener = session_lookup_listener (table_index,
(session_endpoint_t *) & sep);
if (!listener)
return VNET_API_ERROR_ADDRESS_NOT_IN_USE;
-
- return vnet_unbind_i (a->app_index, listen_session_get_handle (listener));
-}
-
-clib_error_t *
-vnet_connect_uri (vnet_connect_args_t * a)
-{
- session_endpoint_extended_t sep = SESSION_ENDPOINT_EXT_NULL;
- int rv;
-
- /* Parse uri */
- rv = parse_uri (a->uri, &sep);
- if (rv)
- return clib_error_return_code (0, rv, 0, "app init: %d", rv);
-
- if ((rv = application_connect (a->app_index, a->api_context,
- (session_endpoint_t *) & sep)))
- return clib_error_return_code (0, rv, 0, "connect failed");
- return 0;
+ a->handle = listen_session_get_handle (listener);
+ return vnet_unlisten (a);
}
int
-vnet_disconnect_session (vnet_disconnect_args_t * a)
-{
- if (session_handle_is_local (a->handle))
- {
- local_session_t *ls;
- ls = application_get_local_session_from_handle (a->handle);
- if (ls->app_index != a->app_index && ls->client_index != a->app_index)
- {
- clib_warning ("app %u is neither client nor server for session %u",
- a->app_index, a->app_index);
- return VNET_API_ERROR_INVALID_VALUE;
- }
- return application_local_session_disconnect (a->app_index, ls);
- }
- else
- {
- stream_session_t *s;
- s = session_get_from_handle_if_valid (a->handle);
- 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 == session_index_from_handle (a->handle));
-
- stream_session_disconnect (s);
- }
- return 0;
-}
-
-clib_error_t *
-vnet_bind (vnet_bind_args_t * a)
-{
- int rv;
- if ((rv = vnet_bind_i (a->app_index, &a->sep, &a->handle)))
- return clib_error_return_code (0, rv, 0, "bind failed: %d", rv);
- return 0;
-}
-
-clib_error_t *
-vnet_unbind (vnet_unbind_args_t * a)
+vnet_connect_uri (vnet_connect_args_t * a)
{
+ session_endpoint_cfg_t sep = SESSION_ENDPOINT_CFG_NULL;
int rv;
- if ((rv = vnet_unbind_i (a->app_index, a->handle)))
- return clib_error_return_code (0, rv, 0, "unbind failed: %d", rv);
- return 0;
-}
-clib_error_t *
-vnet_connect (vnet_connect_args_t * a)
-{
- session_endpoint_t *sep = (session_endpoint_t *) & a->sep;
- int rv;
+ if ((rv = parse_uri (a->uri, &sep)))
+ return rv;
- if ((rv = application_connect (a->app_index, a->api_context, sep)))
- return clib_error_return_code (0, rv, 0, "connect failed: %d", rv);
+ clib_memcpy (&a->sep_ext, &sep, sizeof (sep));
+ if ((rv = vnet_connect (a)))
+ return rv;
return 0;
}