2 * Copyright (c) 2019 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/session/application_local.h>
17 #include <vnet/session/session.h>
19 static ct_connection_t *connections;
22 ct_enable_disable_main_pre_input_node (u8 is_add)
26 if (!vlib_num_workers ())
29 n_conns = pool_elts (connections);
33 if (n_conns > 0 && is_add)
34 vlib_node_set_state (vlib_get_main (),
35 session_queue_pre_input_node.index,
36 VLIB_NODE_STATE_POLLING);
37 else if (n_conns == 0)
38 vlib_node_set_state (vlib_get_main (),
39 session_queue_pre_input_node.index,
40 VLIB_NODE_STATE_DISABLED);
43 static ct_connection_t *
44 ct_connection_alloc (void)
48 pool_get_zero (connections, ct);
49 ct->c_c_index = ct - connections;
50 ct->c_thread_index = 0;
56 static ct_connection_t *
57 ct_connection_get (u32 ct_index)
59 if (pool_is_free_index (connections, ct_index))
61 return pool_elt_at_index (connections, ct_index);
65 ct_connection_free (ct_connection_t * ct)
68 memset (ct, 0xfc, sizeof (*ct));
69 pool_put (connections, ct);
73 ct_session_get_peer (session_t * s)
75 ct_connection_t *ct, *peer_ct;
76 ct = ct_connection_get (s->connection_index);
77 peer_ct = ct_connection_get (ct->peer_index);
78 return session_get (peer_ct->c_s_index, 0);
82 ct_session_endpoint (session_t * ll, session_endpoint_t * sep)
85 ct = (ct_connection_t *) session_get_transport (ll);
86 sep->transport_proto = ct->actual_tp;
87 sep->port = ct->c_lcl_port;
88 sep->is_ip4 = ct->c_is_ip4;
92 ct_session_connect_notify (session_t * ss)
94 ct_connection_t *sct, *cct;
95 app_worker_t *client_wrk;
96 segment_manager_t *sm;
103 ss_index = ss->session_index;
104 sct = (ct_connection_t *) session_get_transport (ss);
105 client_wrk = app_worker_get (sct->client_wrk);
107 sm = segment_manager_get (ss->rx_fifo->segment_manager);
108 seg = segment_manager_get_segment_w_lock (sm, ss->rx_fifo->segment_index);
109 segment_handle = segment_manager_segment_handle (sm, seg);
111 if ((err = app_worker_add_segment_notify (client_wrk, segment_handle)))
113 clib_warning ("failed to notify client %u of new segment",
115 segment_manager_segment_reader_unlock (sm);
120 segment_manager_segment_reader_unlock (sm);
123 /* Alloc client session */
124 cct = ct_connection_get (sct->peer_index);
126 cs = session_alloc (0);
127 ss = session_get (ss_index, 0);
128 cs->session_type = ss->session_type;
129 cs->connection_index = sct->c_c_index;
130 cs->listener_handle = SESSION_INVALID_HANDLE;
131 cs->session_state = SESSION_STATE_CONNECTING;
132 cs->app_wrk_index = client_wrk->wrk_index;
133 cs->connection_index = cct->c_c_index;
135 cct->c_s_index = cs->session_index;
136 cct->client_rx_fifo = ss->tx_fifo;
137 cct->client_tx_fifo = ss->rx_fifo;
139 cct->client_rx_fifo->refcnt++;
140 cct->client_tx_fifo->refcnt++;
142 /* This will allocate fifos for the session. They won't be used for
143 * exchanging data but they will be used to close the connection if
144 * the segment manager/worker is freed */
145 if (app_worker_init_connected (client_wrk, cs))
151 if (app_worker_connect_notify (client_wrk, cs, err, sct->client_opaque))
157 cs = session_get (cct->c_s_index, 0);
158 cs->session_state = SESSION_STATE_READY;
164 ct_init_local_session (app_worker_t * client_wrk, app_worker_t * server_wrk,
165 ct_connection_t * ct, session_t * ls, session_t * ll)
167 u32 round_rx_fifo_sz, round_tx_fifo_sz, sm_index, seg_size;
168 segment_manager_props_t *props;
169 application_t *server;
170 segment_manager_t *sm;
171 u32 margin = 16 << 10;
176 server = application_get (server_wrk->app_index);
178 props = application_segment_manager_properties (server);
179 round_rx_fifo_sz = 1 << max_log2 (props->rx_fifo_size);
180 round_tx_fifo_sz = 1 << max_log2 (props->tx_fifo_size);
181 /* Increase size because of inefficient chunk allocations. Depending on
182 * how data is consumed, it may happen that more chunks than needed are
184 * TODO should remove once allocations are done more efficiently */
185 seg_size = 4 * (round_rx_fifo_sz + round_tx_fifo_sz + margin);
187 sm = app_worker_get_listen_segment_manager (server_wrk, ll);
188 seg_index = segment_manager_add_segment (sm, seg_size);
191 clib_warning ("failed to add new cut-through segment");
194 seg = segment_manager_get_segment_w_lock (sm, seg_index);
196 rv = segment_manager_try_alloc_fifos (seg, ls->thread_index,
198 props->tx_fifo_size, &ls->rx_fifo,
202 clib_warning ("failed to add fifos in cut-through segment");
203 segment_manager_segment_reader_unlock (sm);
207 sm_index = segment_manager_index (sm);
208 ls->rx_fifo->master_session_index = ls->session_index;
209 ls->tx_fifo->master_session_index = ls->session_index;
210 ls->rx_fifo->segment_manager = sm_index;
211 ls->tx_fifo->segment_manager = sm_index;
212 ls->rx_fifo->segment_index = seg_index;
213 ls->tx_fifo->segment_index = seg_index;
215 segment_handle = segment_manager_segment_handle (sm, seg);
216 if ((rv = app_worker_add_segment_notify (server_wrk, segment_handle)))
218 clib_warning ("failed to notify server of new segment");
219 segment_manager_segment_reader_unlock (sm);
222 segment_manager_segment_reader_unlock (sm);
223 ct->segment_handle = segment_handle;
228 segment_manager_del_segment (sm, seg);
233 ct_connect (app_worker_t * client_wrk, session_t * ll,
234 session_endpoint_cfg_t * sep)
236 u32 cct_index, ll_index, ll_ct_index;
237 ct_connection_t *sct, *cct, *ll_ct;
238 app_worker_t *server_wrk;
241 ll_index = ll->session_index;
242 ll_ct_index = ll->connection_index;
244 cct = ct_connection_alloc ();
245 cct_index = cct->c_c_index;
246 sct = ct_connection_alloc ();
247 ll_ct = ct_connection_get (ll_ct_index);
250 * Alloc and init client transport
252 cct = ct_connection_get (cct_index);
253 cct->c_thread_index = 0;
254 cct->c_rmt_port = sep->port;
256 cct->c_is_ip4 = sep->is_ip4;
257 clib_memcpy (&cct->c_rmt_ip, &sep->ip, sizeof (sep->ip));
258 cct->actual_tp = ll_ct->actual_tp;
262 * Init server transport
264 sct->c_thread_index = 0;
266 sct->c_lcl_port = ll_ct->c_lcl_port;
267 sct->c_is_ip4 = sep->is_ip4;
268 clib_memcpy (&sct->c_lcl_ip, &ll_ct->c_lcl_ip, sizeof (ll_ct->c_lcl_ip));
269 sct->client_wrk = client_wrk->wrk_index;
270 sct->c_proto = TRANSPORT_PROTO_NONE;
271 sct->client_opaque = sep->opaque;
272 sct->actual_tp = ll_ct->actual_tp;
274 sct->peer_index = cct->c_c_index;
275 cct->peer_index = sct->c_c_index;
278 * Accept server session. Client session is created only after
279 * server confirms accept.
281 ss = session_alloc (0);
282 ll = listen_session_get (ll_index);
283 ss->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE,
285 ss->connection_index = sct->c_c_index;
286 ss->listener_handle = listen_session_get_handle (ll);
287 ss->session_state = SESSION_STATE_CREATED;
289 server_wrk = application_listener_select_worker (ll);
290 ss->app_wrk_index = server_wrk->wrk_index;
292 sct->c_s_index = ss->session_index;
293 sct->server_wrk = ss->app_wrk_index;
295 if (ct_init_local_session (client_wrk, server_wrk, sct, ss, ll))
297 ct_connection_free (sct);
302 ss->session_state = SESSION_STATE_ACCEPTING;
303 if (app_worker_accept_notify (server_wrk, ss))
305 ct_connection_free (sct);
306 segment_manager_dealloc_fifos (ss->rx_fifo, ss->tx_fifo);
311 cct->segment_handle = sct->segment_handle;
312 ct_enable_disable_main_pre_input_node (1 /* is_add */ );
317 ct_start_listen (u32 app_listener_index, transport_endpoint_t * tep)
319 session_endpoint_cfg_t *sep;
322 sep = (session_endpoint_cfg_t *) tep;
323 ct = ct_connection_alloc ();
324 ct->server_wrk = sep->app_wrk_index;
325 ct->c_is_ip4 = sep->is_ip4;
326 clib_memcpy (&ct->c_lcl_ip, &sep->ip, sizeof (sep->ip));
327 ct->c_lcl_port = sep->port;
328 ct->actual_tp = sep->transport_proto;
329 ct_enable_disable_main_pre_input_node (1 /* is_add */ );
330 return ct->c_c_index;
334 ct_stop_listen (u32 ct_index)
337 ct = ct_connection_get (ct_index);
338 ct_connection_free (ct);
339 ct_enable_disable_main_pre_input_node (0 /* is_add */ );
343 static transport_connection_t *
344 ct_listener_get (u32 ct_index)
346 return (transport_connection_t *) ct_connection_get (ct_index);
350 ct_session_connect (transport_endpoint_cfg_t * tep)
352 session_endpoint_cfg_t *sep_ext;
353 session_endpoint_t *sep;
354 app_worker_t *app_wrk;
362 sep_ext = (session_endpoint_cfg_t *) tep;
363 sep = (session_endpoint_t *) tep;
364 app_wrk = app_worker_get (sep_ext->app_wrk_index);
365 app = application_get (app_wrk->app_index);
367 sep->transport_proto = sep_ext->original_tp;
368 table_index = application_local_session_table (app);
369 lh = session_lookup_local_endpoint (table_index, sep);
370 if (lh == SESSION_DROP_HANDLE)
371 return SESSION_E_FILTERED;
373 if (lh == SESSION_INVALID_HANDLE)
376 ll = listen_session_get_from_handle (lh);
377 al = app_listener_get_w_session (ll);
380 * Break loop if rule in local table points to connecting app. This
381 * can happen if client is a generic proxy. Route connect through
382 * global table instead.
384 if (al->app_index == app->app_index)
387 return ct_connect (app_wrk, ll, sep_ext);
390 * If nothing found, check the global scope for locally attached
391 * destinations. Make sure first that we're allowed to.
395 if (session_endpoint_is_local (sep))
396 return SESSION_E_NOROUTE;
398 if (!application_has_global_scope (app))
399 return SESSION_E_SCOPE;
401 fib_proto = session_endpoint_fib_proto (sep);
402 table_index = session_lookup_get_index_for_fib (fib_proto, sep->fib_index);
403 ll = session_lookup_listener_wildcard (table_index, sep);
406 return ct_connect (app_wrk, ll, sep_ext);
408 /* Failed to connect but no error */
413 ct_session_close (u32 ct_index, u32 thread_index)
415 ct_connection_t *ct, *peer_ct;
416 app_worker_t *app_wrk;
419 ct = ct_connection_get (ct_index);
420 peer_ct = ct_connection_get (ct->peer_index);
423 peer_ct->peer_index = ~0;
424 session_transport_closing_notify (&peer_ct->connection);
427 s = session_get (ct->c_s_index, 0);
428 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
430 app_worker_del_segment_notify (app_wrk, ct->segment_handle);
431 session_free_w_fifos (s);
433 segment_manager_dealloc_fifos (ct->client_rx_fifo, ct->client_tx_fifo);
435 ct_connection_free (ct);
436 ct_enable_disable_main_pre_input_node (0 /* is_add */ );
439 static transport_connection_t *
440 ct_session_get (u32 ct_index, u32 thread_index)
442 return (transport_connection_t *) ct_connection_get (ct_index);
446 format_ct_connection_id (u8 * s, va_list * args)
448 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
453 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
454 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
455 format_ip4_address, &ct->c_lcl_ip4,
456 clib_net_to_host_u16 (ct->c_lcl_port), format_ip4_address,
457 &ct->c_rmt_ip4, clib_net_to_host_u16 (ct->c_rmt_port));
461 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
462 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
463 format_ip6_address, &ct->c_lcl_ip6,
464 clib_net_to_host_u16 (ct->c_lcl_port), format_ip6_address,
465 &ct->c_rmt_ip6, clib_net_to_host_u16 (ct->c_rmt_port));
472 ct_custom_tx (void *session, transport_send_params_t * sp)
474 session_t *s = (session_t *) session;
475 if (session_has_transport (s))
477 return ct_session_tx (s);
481 ct_app_rx_evt (transport_connection_t * tc)
483 ct_connection_t *ct = (ct_connection_t *) tc, *peer_ct;
486 peer_ct = ct_connection_get (ct->peer_index);
489 ps = session_get (peer_ct->c_s_index, peer_ct->c_thread_index);
490 return session_dequeue_notify (ps);
494 format_ct_listener (u8 * s, va_list * args)
496 u32 tc_index = va_arg (*args, u32);
497 u32 __clib_unused thread_index = va_arg (*args, u32);
498 u32 __clib_unused verbose = va_arg (*args, u32);
499 ct_connection_t *ct = ct_connection_get (tc_index);
500 s = format (s, "%-50U", format_ct_connection_id, ct);
502 s = format (s, "%-15s", "LISTEN");
507 format_ct_connection (u8 * s, va_list * args)
509 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
510 u32 verbose = va_arg (*args, u32);
514 s = format (s, "%-50U", format_ct_connection_id, ct);
517 s = format (s, "%-15s", "ESTABLISHED");
520 s = format (s, "\n");
527 format_ct_session (u8 * s, va_list * args)
529 u32 ct_index = va_arg (*args, u32);
530 u32 __clib_unused thread_index = va_arg (*args, u32);
531 u32 verbose = va_arg (*args, u32);
534 ct = ct_connection_get (ct_index);
537 s = format (s, "empty\n");
541 s = format (s, "%U", format_ct_connection, ct, verbose);
546 static const transport_proto_vft_t cut_thru_proto = {
547 .start_listen = ct_start_listen,
548 .stop_listen = ct_stop_listen,
549 .get_listener = ct_listener_get,
550 .connect = ct_session_connect,
551 .close = ct_session_close,
552 .get_connection = ct_session_get,
553 .custom_tx = ct_custom_tx,
554 .app_rx_evt = ct_app_rx_evt,
555 .format_listener = format_ct_listener,
556 .format_connection = format_ct_session,
557 .transport_options = {
560 .tx_type = TRANSPORT_TX_INTERNAL,
561 .service_type = TRANSPORT_SERVICE_APP,
567 ct_session_tx (session_t * s)
569 ct_connection_t *ct, *peer_ct;
572 ct = (ct_connection_t *) session_get_transport (s);
573 peer_ct = ct_connection_get (ct->peer_index);
576 peer_s = session_get (peer_ct->c_s_index, 0);
577 if (peer_s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
579 return session_enqueue_notify (peer_s);
582 static clib_error_t *
583 ct_transport_init (vlib_main_t * vm)
585 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
586 FIB_PROTOCOL_IP4, ~0);
587 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
588 FIB_PROTOCOL_IP6, ~0);
592 VLIB_INIT_FUNCTION (ct_transport_init);
595 * fd.io coding-style-patch-verification: ON
598 * eval: (c-set-style "gnu")