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 (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);
121 segment_manager_segment_reader_unlock (sm);
124 /* Alloc client session */
125 cct = ct_connection_get (sct->peer_index);
127 cs = session_alloc (0);
128 ss = session_get (ss_index, 0);
129 cs->session_type = ss->session_type;
130 cs->connection_index = sct->c_c_index;
131 cs->listener_handle = SESSION_INVALID_HANDLE;
132 cs->session_state = SESSION_STATE_CONNECTING;
133 cs->app_wrk_index = client_wrk->wrk_index;
134 cs->connection_index = cct->c_c_index;
136 cct->c_s_index = cs->session_index;
137 cct->client_rx_fifo = ss->tx_fifo;
138 cct->client_tx_fifo = ss->rx_fifo;
140 cct->client_rx_fifo->refcnt++;
141 cct->client_tx_fifo->refcnt++;
143 /* This will allocate fifos for the session. They won't be used for
144 * exchanging data but they will be used to close the connection if
145 * the segment manager/worker is freed */
146 if (app_worker_init_connected (client_wrk, cs))
152 if (app_worker_connect_notify (client_wrk, is_fail ? 0 : cs,
159 cs = session_get (cct->c_s_index, 0);
160 cs->session_state = SESSION_STATE_READY;
166 ct_init_local_session (app_worker_t * client_wrk, app_worker_t * server_wrk,
167 ct_connection_t * ct, session_t * ls, session_t * ll)
169 u32 round_rx_fifo_sz, round_tx_fifo_sz, sm_index, seg_size;
170 segment_manager_props_t *props;
171 application_t *server;
172 segment_manager_t *sm;
173 u32 margin = 16 << 10;
178 server = application_get (server_wrk->app_index);
180 props = application_segment_manager_properties (server);
181 round_rx_fifo_sz = 1 << max_log2 (props->rx_fifo_size);
182 round_tx_fifo_sz = 1 << max_log2 (props->tx_fifo_size);
183 /* Increase size because of inefficient chunk allocations. Depending on
184 * how data is consumed, it may happen that more chunks than needed are
186 * TODO should remove once allocations are done more efficiently */
187 seg_size = 4 * (round_rx_fifo_sz + round_tx_fifo_sz + margin);
189 sm = app_worker_get_listen_segment_manager (server_wrk, ll);
190 seg_index = segment_manager_add_segment (sm, seg_size);
193 clib_warning ("failed to add new cut-through segment");
196 seg = segment_manager_get_segment_w_lock (sm, seg_index);
198 rv = segment_manager_try_alloc_fifos (seg, ls->thread_index,
200 props->tx_fifo_size, &ls->rx_fifo,
204 clib_warning ("failed to add fifos in cut-through segment");
205 segment_manager_segment_reader_unlock (sm);
209 sm_index = segment_manager_index (sm);
210 ls->rx_fifo->master_session_index = ls->session_index;
211 ls->tx_fifo->master_session_index = ls->session_index;
212 ls->rx_fifo->segment_manager = sm_index;
213 ls->tx_fifo->segment_manager = sm_index;
214 ls->rx_fifo->segment_index = seg_index;
215 ls->tx_fifo->segment_index = seg_index;
217 segment_handle = segment_manager_segment_handle (sm, seg);
218 if ((rv = app_worker_add_segment_notify (server_wrk, segment_handle)))
220 clib_warning ("failed to notify server of new segment");
221 segment_manager_segment_reader_unlock (sm);
224 segment_manager_segment_reader_unlock (sm);
225 ct->segment_handle = segment_handle;
230 segment_manager_del_segment (sm, seg);
235 ct_connect (app_worker_t * client_wrk, session_t * ll,
236 session_endpoint_cfg_t * sep)
238 u32 cct_index, ll_index, ll_ct_index;
239 ct_connection_t *sct, *cct, *ll_ct;
240 app_worker_t *server_wrk;
243 ll_index = ll->session_index;
244 ll_ct_index = ll->connection_index;
246 cct = ct_connection_alloc ();
247 cct_index = cct->c_c_index;
248 sct = ct_connection_alloc ();
249 ll_ct = ct_connection_get (ll_ct_index);
252 * Alloc and init client transport
254 cct = ct_connection_get (cct_index);
255 cct->c_thread_index = 0;
256 cct->c_rmt_port = sep->port;
258 cct->c_is_ip4 = sep->is_ip4;
259 clib_memcpy (&cct->c_rmt_ip, &sep->ip, sizeof (sep->ip));
260 cct->actual_tp = ll_ct->actual_tp;
264 * Init server transport
266 sct->c_thread_index = 0;
268 sct->c_lcl_port = ll_ct->c_lcl_port;
269 sct->c_is_ip4 = sep->is_ip4;
270 clib_memcpy (&sct->c_lcl_ip, &ll_ct->c_lcl_ip, sizeof (ll_ct->c_lcl_ip));
271 sct->client_wrk = client_wrk->wrk_index;
272 sct->c_proto = TRANSPORT_PROTO_NONE;
273 sct->client_opaque = sep->opaque;
274 sct->actual_tp = ll_ct->actual_tp;
276 sct->peer_index = cct->c_c_index;
277 cct->peer_index = sct->c_c_index;
280 * Accept server session. Client session is created only after
281 * server confirms accept.
283 ss = session_alloc (0);
284 ll = listen_session_get (ll_index);
285 ss->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE,
287 ss->connection_index = sct->c_c_index;
288 ss->listener_handle = listen_session_get_handle (ll);
289 ss->session_state = SESSION_STATE_CREATED;
291 server_wrk = application_listener_select_worker (ll);
292 ss->app_wrk_index = server_wrk->wrk_index;
294 sct->c_s_index = ss->session_index;
295 sct->server_wrk = ss->app_wrk_index;
297 if (ct_init_local_session (client_wrk, server_wrk, sct, ss, ll))
299 clib_warning ("failed");
300 ct_connection_free (sct);
305 ss->session_state = SESSION_STATE_ACCEPTING;
306 if (app_worker_accept_notify (server_wrk, ss))
308 clib_warning ("failed");
309 ct_connection_free (sct);
310 session_free_w_fifos (ss);
314 cct->segment_handle = sct->segment_handle;
315 ct_enable_disable_main_pre_input_node (1 /* is_add */ );
320 ct_start_listen (u32 app_listener_index, transport_endpoint_t * tep)
322 session_endpoint_cfg_t *sep;
325 sep = (session_endpoint_cfg_t *) tep;
326 ct = ct_connection_alloc ();
327 ct->server_wrk = sep->app_wrk_index;
328 ct->c_is_ip4 = sep->is_ip4;
329 clib_memcpy (&ct->c_lcl_ip, &sep->ip, sizeof (sep->ip));
330 ct->c_lcl_port = sep->port;
331 ct->actual_tp = sep->transport_proto;
332 ct_enable_disable_main_pre_input_node (1 /* is_add */ );
333 return ct->c_c_index;
337 ct_stop_listen (u32 ct_index)
340 ct = ct_connection_get (ct_index);
341 ct_connection_free (ct);
342 ct_enable_disable_main_pre_input_node (0 /* is_add */ );
346 static transport_connection_t *
347 ct_listener_get (u32 ct_index)
349 return (transport_connection_t *) ct_connection_get (ct_index);
353 ct_session_connect (transport_endpoint_cfg_t * tep)
355 session_endpoint_cfg_t *sep_ext;
356 session_endpoint_t *sep;
357 app_worker_t *app_wrk;
365 sep_ext = (session_endpoint_cfg_t *) tep;
366 sep = (session_endpoint_t *) tep;
367 app_wrk = app_worker_get (sep_ext->app_wrk_index);
368 app = application_get (app_wrk->app_index);
370 sep->transport_proto = sep_ext->original_tp;
371 table_index = application_local_session_table (app);
372 lh = session_lookup_local_endpoint (table_index, sep);
373 if (lh == SESSION_DROP_HANDLE)
374 return VNET_API_ERROR_APP_CONNECT_FILTERED;
376 if (lh == SESSION_INVALID_HANDLE)
379 ll = listen_session_get_from_handle (lh);
380 al = app_listener_get_w_session (ll);
383 * Break loop if rule in local table points to connecting app. This
384 * can happen if client is a generic proxy. Route connect through
385 * global table instead.
387 if (al->app_index == app->app_index)
390 return ct_connect (app_wrk, ll, sep_ext);
393 * If nothing found, check the global scope for locally attached
394 * destinations. Make sure first that we're allowed to.
398 if (session_endpoint_is_local (sep))
399 return VNET_API_ERROR_SESSION_CONNECT;
401 if (!application_has_global_scope (app))
402 return VNET_API_ERROR_APP_CONNECT_SCOPE;
404 fib_proto = session_endpoint_fib_proto (sep);
405 table_index = session_lookup_get_index_for_fib (fib_proto, sep->fib_index);
406 ll = session_lookup_listener_wildcard (table_index, sep);
409 return ct_connect (app_wrk, ll, sep_ext);
411 /* Failed to connect but no error */
416 ct_session_close (u32 ct_index, u32 thread_index)
418 ct_connection_t *ct, *peer_ct;
419 app_worker_t *app_wrk;
422 ct = ct_connection_get (ct_index);
423 peer_ct = ct_connection_get (ct->peer_index);
426 peer_ct->peer_index = ~0;
427 session_transport_closing_notify (&peer_ct->connection);
430 s = session_get (ct->c_s_index, 0);
431 app_wrk = app_worker_get_if_valid (s->app_wrk_index);
433 app_worker_del_segment_notify (app_wrk, ct->segment_handle);
434 session_free_w_fifos (s);
436 segment_manager_dealloc_fifos (ct->client_rx_fifo, ct->client_tx_fifo);
438 ct_connection_free (ct);
439 ct_enable_disable_main_pre_input_node (0 /* is_add */ );
442 static transport_connection_t *
443 ct_session_get (u32 ct_index, u32 thread_index)
445 return (transport_connection_t *) ct_connection_get (ct_index);
449 format_ct_connection_id (u8 * s, va_list * args)
451 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
456 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
457 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
458 format_ip4_address, &ct->c_lcl_ip4,
459 clib_net_to_host_u16 (ct->c_lcl_port), format_ip4_address,
460 &ct->c_rmt_ip4, clib_net_to_host_u16 (ct->c_rmt_port));
464 s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index,
465 ct->c_s_index, format_transport_proto_short, ct->actual_tp,
466 format_ip6_address, &ct->c_lcl_ip6,
467 clib_net_to_host_u16 (ct->c_lcl_port), format_ip6_address,
468 &ct->c_rmt_ip6, clib_net_to_host_u16 (ct->c_rmt_port));
475 ct_custom_tx (void *session, u32 max_burst_size)
477 session_t *s = (session_t *) session;
478 if (session_has_transport (s))
480 return ct_session_tx (s);
484 ct_app_rx_evt (transport_connection_t * tc)
486 ct_connection_t *ct = (ct_connection_t *) tc, *peer_ct;
489 peer_ct = ct_connection_get (ct->peer_index);
492 ps = session_get (peer_ct->c_s_index, peer_ct->c_thread_index);
493 return session_dequeue_notify (ps);
497 format_ct_listener (u8 * s, va_list * args)
499 u32 tc_index = va_arg (*args, u32);
500 u32 __clib_unused thread_index = va_arg (*args, u32);
501 u32 __clib_unused verbose = va_arg (*args, u32);
502 ct_connection_t *ct = ct_connection_get (tc_index);
503 s = format (s, "%-50U", format_ct_connection_id, ct);
505 s = format (s, "%-15s", "LISTEN");
510 format_ct_connection (u8 * s, va_list * args)
512 ct_connection_t *ct = va_arg (*args, ct_connection_t *);
513 u32 verbose = va_arg (*args, u32);
517 s = format (s, "%-50U", format_ct_connection_id, ct);
520 s = format (s, "%-15s", "ESTABLISHED");
523 s = format (s, "\n");
530 format_ct_session (u8 * s, va_list * args)
532 u32 ct_index = va_arg (*args, u32);
533 u32 __clib_unused thread_index = va_arg (*args, u32);
534 u32 verbose = va_arg (*args, u32);
537 ct = ct_connection_get (ct_index);
540 s = format (s, "empty\n");
544 s = format (s, "%U", format_ct_connection, ct, verbose);
549 static const transport_proto_vft_t cut_thru_proto = {
550 .start_listen = ct_start_listen,
551 .stop_listen = ct_stop_listen,
552 .get_listener = ct_listener_get,
553 .connect = ct_session_connect,
554 .close = ct_session_close,
555 .get_connection = ct_session_get,
556 .custom_tx = ct_custom_tx,
557 .app_rx_evt = ct_app_rx_evt,
558 .format_listener = format_ct_listener,
559 .format_connection = format_ct_session,
560 .transport_options = {
563 .tx_type = TRANSPORT_TX_INTERNAL,
564 .service_type = TRANSPORT_SERVICE_APP,
570 ct_session_tx (session_t * s)
572 ct_connection_t *ct, *peer_ct;
575 ct = (ct_connection_t *) session_get_transport (s);
576 peer_ct = ct_connection_get (ct->peer_index);
579 peer_s = session_get (peer_ct->c_s_index, 0);
580 if (peer_s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
582 return session_enqueue_notify (peer_s);
585 static clib_error_t *
586 ct_transport_init (vlib_main_t * vm)
588 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
589 FIB_PROTOCOL_IP4, ~0);
590 transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto,
591 FIB_PROTOCOL_IP6, ~0);
595 VLIB_INIT_FUNCTION (ct_transport_init);
598 * fd.io coding-style-patch-verification: ON
601 * eval: (c-set-style "gnu")