2 * Copyright (c) 2017 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.
17 * @brief Session and session manager
20 #include <vnet/session/session.h>
21 #include <vlibmemory/api.h>
22 #include <vnet/dpo/load_balance.h>
23 #include <vnet/fib/ip4_fib.h>
24 #include <vnet/session/application.h>
25 #include <vnet/tcp/tcp.h>
26 #include <vnet/session/session_debug.h>
29 * Per-type vector of transport protocol virtual function tables
31 static transport_proto_vft_t *tp_vfts;
33 session_manager_main_t session_manager_main;
36 * Session lookup key; (src-ip, dst-ip, src-port, dst-port, session-type)
37 * Value: (owner thread index << 32 | session_index);
40 stream_session_table_add_for_tc (transport_connection_t * tc, u64 value)
42 session_manager_main_t *smm = &session_manager_main;
48 case SESSION_TYPE_IP4_UDP:
49 case SESSION_TYPE_IP4_TCP:
50 make_v4_ss_kv_from_tc (&kv4, tc);
52 clib_bihash_add_del_16_8 (&smm->v4_session_hash, &kv4, 1 /* is_add */ );
54 case SESSION_TYPE_IP6_UDP:
55 case SESSION_TYPE_IP6_TCP:
56 make_v6_ss_kv_from_tc (&kv6, tc);
58 clib_bihash_add_del_48_8 (&smm->v6_session_hash, &kv6, 1 /* is_add */ );
61 clib_warning ("Session type not supported");
67 stream_session_table_add (session_manager_main_t * smm, stream_session_t * s,
70 transport_connection_t *tc;
72 tc = tp_vfts[s->session_type].get_connection (s->connection_index,
74 stream_session_table_add_for_tc (tc, value);
78 stream_session_half_open_table_add (session_type_t sst,
79 transport_connection_t * tc, u64 value)
81 session_manager_main_t *smm = &session_manager_main;
87 case SESSION_TYPE_IP4_UDP:
88 case SESSION_TYPE_IP4_TCP:
89 make_v4_ss_kv_from_tc (&kv4, tc);
91 clib_bihash_add_del_16_8 (&smm->v4_half_open_hash, &kv4,
94 case SESSION_TYPE_IP6_UDP:
95 case SESSION_TYPE_IP6_TCP:
96 make_v6_ss_kv_from_tc (&kv6, tc);
98 clib_bihash_add_del_48_8 (&smm->v6_half_open_hash, &kv6,
102 clib_warning ("Session type not supported");
108 stream_session_table_del_for_tc (transport_connection_t * tc)
110 session_manager_main_t *smm = &session_manager_main;
115 case SESSION_TYPE_IP4_UDP:
116 case SESSION_TYPE_IP4_TCP:
117 make_v4_ss_kv_from_tc (&kv4, tc);
118 return clib_bihash_add_del_16_8 (&smm->v4_session_hash, &kv4,
121 case SESSION_TYPE_IP6_UDP:
122 case SESSION_TYPE_IP6_TCP:
123 make_v6_ss_kv_from_tc (&kv6, tc);
124 return clib_bihash_add_del_48_8 (&smm->v6_session_hash, &kv6,
128 clib_warning ("Session type not supported");
136 stream_session_table_del (session_manager_main_t * smm, stream_session_t * s)
138 transport_connection_t *ts;
140 ts = tp_vfts[s->session_type].get_connection (s->connection_index,
142 return stream_session_table_del_for_tc (ts);
146 stream_session_half_open_table_del (session_manager_main_t * smm, u8 sst,
147 transport_connection_t * tc)
154 case SESSION_TYPE_IP4_UDP:
155 case SESSION_TYPE_IP4_TCP:
156 make_v4_ss_kv_from_tc (&kv4, tc);
157 clib_bihash_add_del_16_8 (&smm->v4_half_open_hash, &kv4,
160 case SESSION_TYPE_IP6_UDP:
161 case SESSION_TYPE_IP6_TCP:
162 make_v6_ss_kv_from_tc (&kv6, tc);
163 clib_bihash_add_del_48_8 (&smm->v6_half_open_hash, &kv6,
167 clib_warning ("Session type not supported");
173 stream_session_lookup_listener4 (ip4_address_t * lcl, u16 lcl_port, u8 proto)
175 session_manager_main_t *smm = &session_manager_main;
179 make_v4_listener_kv (&kv4, lcl, lcl_port, proto);
180 rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4);
182 return pool_elt_at_index (smm->listen_sessions[proto], (u32) kv4.value);
184 /* Zero out the lcl ip */
186 rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4);
188 return pool_elt_at_index (smm->listen_sessions[proto], kv4.value);
193 /** Looks up a session based on the 5-tuple passed as argument.
195 * First it tries to find an established session, if this fails, it tries
196 * finding a listener session if this fails, it tries a lookup with a
197 * wildcarded local source (listener bound to all interfaces)
200 stream_session_lookup4 (ip4_address_t * lcl, ip4_address_t * rmt,
201 u16 lcl_port, u16 rmt_port, u8 proto,
204 session_manager_main_t *smm = &session_manager_main;
208 /* Lookup session amongst established ones */
209 make_v4_ss_kv (&kv4, lcl, rmt, lcl_port, rmt_port, proto);
210 rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4);
212 return stream_session_get_tsi (kv4.value, my_thread_index);
214 /* If nothing is found, check if any listener is available */
215 return stream_session_lookup_listener4 (lcl, lcl_port, proto);
219 stream_session_lookup_listener6 (ip6_address_t * lcl, u16 lcl_port, u8 proto)
221 session_manager_main_t *smm = &session_manager_main;
225 make_v6_listener_kv (&kv6, lcl, lcl_port, proto);
226 rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6);
228 return pool_elt_at_index (smm->listen_sessions[proto], kv6.value);
230 /* Zero out the lcl ip */
231 kv6.key[0] = kv6.key[1] = 0;
232 rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6);
234 return pool_elt_at_index (smm->listen_sessions[proto], kv6.value);
239 /* Looks up a session based on the 5-tuple passed as argument.
240 * First it tries to find an established session, if this fails, it tries
241 * finding a listener session if this fails, it tries a lookup with a
242 * wildcarded local source (listener bound to all interfaces) */
244 stream_session_lookup6 (ip6_address_t * lcl, ip6_address_t * rmt,
245 u16 lcl_port, u16 rmt_port, u8 proto,
248 session_manager_main_t *smm = vnet_get_session_manager_main ();
252 make_v6_ss_kv (&kv6, lcl, rmt, lcl_port, rmt_port, proto);
253 rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6);
255 return stream_session_get_tsi (kv6.value, my_thread_index);
257 /* If nothing is found, check if any listener is available */
258 return stream_session_lookup_listener6 (lcl, lcl_port, proto);
262 stream_session_lookup_listener (ip46_address_t * lcl, u16 lcl_port, u8 proto)
266 case SESSION_TYPE_IP4_UDP:
267 case SESSION_TYPE_IP4_TCP:
268 return stream_session_lookup_listener4 (&lcl->ip4, lcl_port, proto);
270 case SESSION_TYPE_IP6_UDP:
271 case SESSION_TYPE_IP6_TCP:
272 return stream_session_lookup_listener6 (&lcl->ip6, lcl_port, proto);
279 stream_session_half_open_lookup (session_manager_main_t * smm,
280 ip46_address_t * lcl, ip46_address_t * rmt,
281 u16 lcl_port, u16 rmt_port, u8 proto)
289 case SESSION_TYPE_IP4_UDP:
290 case SESSION_TYPE_IP4_TCP:
291 make_v4_ss_kv (&kv4, &lcl->ip4, &rmt->ip4, lcl_port, rmt_port, proto);
292 rv = clib_bihash_search_inline_16_8 (&smm->v4_half_open_hash, &kv4);
299 case SESSION_TYPE_IP6_UDP:
300 case SESSION_TYPE_IP6_TCP:
301 make_v6_ss_kv (&kv6, &lcl->ip6, &rmt->ip6, lcl_port, rmt_port, proto);
302 rv = clib_bihash_search_inline_48_8 (&smm->v6_half_open_hash, &kv6);
313 transport_connection_t *
314 stream_session_lookup_transport4 (ip4_address_t * lcl, ip4_address_t * rmt,
315 u16 lcl_port, u16 rmt_port, u8 proto,
318 session_manager_main_t *smm = &session_manager_main;
323 /* Lookup session amongst established ones */
324 make_v4_ss_kv (&kv4, lcl, rmt, lcl_port, rmt_port, proto);
325 rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4);
328 s = stream_session_get_tsi (kv4.value, my_thread_index);
330 return tp_vfts[s->session_type].get_connection (s->connection_index,
334 /* If nothing is found, check if any listener is available */
335 s = stream_session_lookup_listener4 (lcl, lcl_port, proto);
337 return tp_vfts[s->session_type].get_listener (s->connection_index);
339 /* Finally, try half-open connections */
340 rv = clib_bihash_search_inline_16_8 (&smm->v4_half_open_hash, &kv4);
342 return tp_vfts[proto].get_half_open (kv4.value & 0xFFFFFFFF);
347 transport_connection_t *
348 stream_session_lookup_transport6 (ip6_address_t * lcl, ip6_address_t * rmt,
349 u16 lcl_port, u16 rmt_port, u8 proto,
352 session_manager_main_t *smm = &session_manager_main;
357 make_v6_ss_kv (&kv6, lcl, rmt, lcl_port, rmt_port, proto);
358 rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6);
361 s = stream_session_get_tsi (kv6.value, my_thread_index);
363 return tp_vfts[s->session_type].get_connection (s->connection_index,
367 /* If nothing is found, check if any listener is available */
368 s = stream_session_lookup_listener6 (lcl, lcl_port, proto);
370 return tp_vfts[s->session_type].get_listener (s->connection_index);
372 /* Finally, try half-open connections */
373 rv = clib_bihash_search_inline_48_8 (&smm->v6_half_open_hash, &kv6);
375 return tp_vfts[proto].get_half_open (kv6.value & 0xFFFFFFFF);
381 stream_session_create_i (segment_manager_t * sm, transport_connection_t * tc,
382 stream_session_t ** ret_s)
384 session_manager_main_t *smm = &session_manager_main;
385 svm_fifo_t *server_rx_fifo = 0, *server_tx_fifo = 0;
386 u32 fifo_segment_index;
390 u32 thread_index = tc->thread_index;
393 if ((rv = segment_manager_alloc_session_fifos (sm, &server_rx_fifo,
395 &fifo_segment_index)))
398 /* Create the session */
399 pool_get (smm->sessions[thread_index], s);
400 memset (s, 0, sizeof (*s));
402 /* Initialize backpointers */
403 pool_index = s - smm->sessions[thread_index];
404 server_rx_fifo->master_session_index = pool_index;
405 server_rx_fifo->master_thread_index = thread_index;
407 server_tx_fifo->master_session_index = pool_index;
408 server_tx_fifo->master_thread_index = thread_index;
410 s->server_rx_fifo = server_rx_fifo;
411 s->server_tx_fifo = server_tx_fifo;
413 /* Initialize state machine, such as it is... */
414 s->session_type = tc->proto;
415 s->session_state = SESSION_STATE_CONNECTING;
416 s->svm_segment_index = fifo_segment_index;
417 s->thread_index = thread_index;
418 s->session_index = pool_index;
420 /* Attach transport to session */
421 s->connection_index = tc->c_index;
423 /* Attach session to transport */
424 tc->s_index = s->session_index;
426 /* Add to the main lookup table */
427 value = (((u64) thread_index) << 32) | (u64) s->session_index;
428 stream_session_table_add_for_tc (tc, value);
436 * Enqueue data for delivery to session peer. Does not notify peer of enqueue
437 * event but on request can queue notification events for later delivery by
438 * calling stream_server_flush_enqueue_events().
440 * @param tc Transport connection which is to be enqueued data
441 * @param data Data to be enqueued
442 * @param len Length of data to be enqueued
443 * @param queue_event Flag to indicate if peer is to be notified or if event
444 * is to be queued. The former is useful when more data is
445 * enqueued and only one event is to be generated.
446 * @return Number of bytes enqueued or a negative value if enqueueing failed.
449 stream_session_enqueue_data (transport_connection_t * tc, u8 * data, u16 len,
455 s = stream_session_get (tc->s_index, tc->thread_index);
457 /* Make sure there's enough space left. We might've filled the pipes */
458 if (PREDICT_FALSE (len > svm_fifo_max_enqueue (s->server_rx_fifo)))
461 enqueued = svm_fifo_enqueue_nowait (s->server_rx_fifo, len, data);
465 /* Queue RX event on this fifo. Eventually these will need to be flushed
466 * by calling stream_server_flush_enqueue_events () */
467 session_manager_main_t *smm = vnet_get_session_manager_main ();
468 u32 thread_index = s->thread_index;
469 u32 my_enqueue_epoch = smm->current_enqueue_epoch[thread_index];
471 if (s->enqueue_epoch != my_enqueue_epoch)
473 s->enqueue_epoch = my_enqueue_epoch;
474 vec_add1 (smm->session_indices_to_enqueue_by_thread[thread_index],
475 s - smm->sessions[thread_index]);
482 /** Check if we have space in rx fifo to push more bytes */
484 stream_session_no_space (transport_connection_t * tc, u32 thread_index,
487 stream_session_t *s = stream_session_get (tc->c_index, thread_index);
489 if (PREDICT_FALSE (s->session_state != SESSION_STATE_READY))
492 if (data_len > svm_fifo_max_enqueue (s->server_rx_fifo))
499 stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
500 u32 offset, u32 max_bytes)
502 stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
503 return svm_fifo_peek (s->server_tx_fifo, offset, max_bytes, buffer);
507 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes)
509 stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
510 return svm_fifo_dequeue_drop (s->server_tx_fifo, max_bytes);
514 * Notify session peer that new data has been enqueued.
516 * @param s Stream session for which the event is to be generated.
517 * @param block Flag to indicate if call should block if event queue is full.
519 * @return 0 on succes or negative number if failed to send notification.
522 stream_session_enqueue_notify (stream_session_t * s, u8 block)
525 session_fifo_event_t evt;
526 unix_shared_memory_queue_t *q;
527 static u32 serial_number;
529 if (PREDICT_FALSE (s->session_state == SESSION_STATE_CLOSED))
532 /* Get session's server */
533 app = application_get (s->app_index);
535 /* Built-in server? Hand event to the callback... */
536 if (app->cb_fns.builtin_server_rx_callback)
537 return app->cb_fns.builtin_server_rx_callback (s);
539 /* If no event, send one */
540 if (svm_fifo_set_event (s->server_rx_fifo))
542 /* Fabricate event */
543 evt.fifo = s->server_rx_fifo;
544 evt.event_type = FIFO_EVENT_APP_RX;
545 evt.event_id = serial_number++;
547 /* Add event to server's event queue */
548 q = app->event_queue;
550 /* Based on request block (or not) for lack of space */
551 if (block || PREDICT_TRUE (q->cursize < q->maxsize))
552 unix_shared_memory_queue_add (app->event_queue, (u8 *) & evt,
553 0 /* do wait for mutex */ );
556 clib_warning ("fifo full");
562 SESSION_EVT_DBG(SESSION_EVT_ENQ, s, ({
563 ed->data[0] = evt.event_id;
564 ed->data[1] = svm_fifo_max_dequeue (s->server_rx_fifo);
572 * Flushes queue of sessions that are to be notified of new data
575 * @param thread_index Thread index for which the flush is to be performed.
576 * @return 0 on success or a positive number indicating the number of
577 * failures due to API queue being full.
580 session_manager_flush_enqueue_events (u32 thread_index)
582 session_manager_main_t *smm = &session_manager_main;
583 u32 *session_indices_to_enqueue;
586 session_indices_to_enqueue =
587 smm->session_indices_to_enqueue_by_thread[thread_index];
589 for (i = 0; i < vec_len (session_indices_to_enqueue); i++)
591 stream_session_t *s0;
594 s0 = stream_session_get (session_indices_to_enqueue[i], thread_index);
595 if (stream_session_enqueue_notify (s0, 0 /* don't block */ ))
601 vec_reset_length (session_indices_to_enqueue);
603 smm->session_indices_to_enqueue_by_thread[thread_index] =
604 session_indices_to_enqueue;
606 /* Increment enqueue epoch for next round */
607 smm->current_enqueue_epoch[thread_index]++;
613 * Init fifo tail and head pointers
615 * Useful if transport uses absolute offsets for tracking ooo segments.
618 stream_session_init_fifos_pointers (transport_connection_t * tc,
619 u32 rx_pointer, u32 tx_pointer)
622 s = stream_session_get (tc->s_index, tc->thread_index);
623 svm_fifo_init_pointers (s->server_rx_fifo, rx_pointer);
624 svm_fifo_init_pointers (s->server_tx_fifo, tx_pointer);
628 stream_session_connect_notify (transport_connection_t * tc, u8 sst,
631 session_manager_main_t *smm = &session_manager_main;
633 stream_session_t *new_s = 0;
637 handle = stream_session_half_open_lookup (smm, &tc->lcl_ip, &tc->rmt_ip,
638 tc->lcl_port, tc->rmt_port,
640 if (handle == HALF_OPEN_LOOKUP_INVALID_VALUE)
642 clib_warning ("This can't be good!");
646 /* Get the app's index from the handle we stored when opening connection */
647 app = application_get (handle >> 32);
648 api_context = tc->s_index;
652 segment_manager_t *sm;
653 sm = application_get_connect_segment_manager (app);
655 /* Create new session (svm segments are allocated if needed) */
656 if (stream_session_create_i (sm, tc, &new_s))
659 new_s->app_index = app->index;
663 app->cb_fns.session_connected_callback (app->index, api_context, new_s,
666 /* Cleanup session lookup */
667 stream_session_half_open_table_del (smm, sst, tc);
671 stream_session_accept_notify (transport_connection_t * tc)
673 application_t *server;
676 s = stream_session_get (tc->s_index, tc->thread_index);
677 server = application_get (s->app_index);
678 server->cb_fns.session_accept_callback (s);
682 * Notification from transport that connection is being closed.
684 * A disconnect is sent to application but state is not removed. Once
685 * disconnect is acknowledged by application, session disconnect is called.
686 * Ultimately this leads to close being called on transport (passive close).
689 stream_session_disconnect_notify (transport_connection_t * tc)
691 application_t *server;
694 s = stream_session_get (tc->s_index, tc->thread_index);
695 server = application_get (s->app_index);
696 server->cb_fns.session_disconnect_callback (s);
700 * Cleans up session and associated app if needed.
703 stream_session_delete (stream_session_t * s)
705 session_manager_main_t *smm = vnet_get_session_manager_main ();
707 /* Delete from the main lookup table. */
708 stream_session_table_del (smm, s);
710 /* Cleanup fifo segments */
711 segment_manager_dealloc_fifos (s->svm_segment_index, s->server_rx_fifo,
714 pool_put (smm->sessions[s->thread_index], s);
718 * Notification from transport that connection is being deleted
720 * This should be called only on previously fully established sessions. For
721 * instance failed connects should call stream_session_connect_notify and
722 * indicate that the connect has failed.
725 stream_session_delete_notify (transport_connection_t * tc)
729 /* App might've been removed already */
730 s = stream_session_get_if_valid (tc->s_index, tc->thread_index);
735 stream_session_delete (s);
739 * Notify application that connection has been reset.
742 stream_session_reset_notify (transport_connection_t * tc)
746 s = stream_session_get (tc->s_index, tc->thread_index);
748 app = application_get (s->app_index);
749 app->cb_fns.session_reset_callback (s);
753 * Accept a stream session. Optionally ping the server by callback.
756 stream_session_accept (transport_connection_t * tc, u32 listener_index,
759 application_t *server;
760 stream_session_t *s, *listener;
761 segment_manager_t *sm;
765 /* Find the server */
766 listener = listen_session_get (sst, listener_index);
767 server = application_get (listener->app_index);
769 sm = application_get_listen_segment_manager (server, listener);
770 if ((rv = stream_session_create_i (sm, tc, &s)))
773 s->app_index = server->index;
774 s->listener_index = listener_index;
776 /* Shoulder-tap the server */
779 server->cb_fns.session_accept_callback (s);
786 * Ask transport to open connection to remote transport endpoint.
788 * Stores handle for matching request with reply since the call can be
789 * asynchronous. For instance, for TCP the 3-way handshake must complete
790 * before reply comes. Session is only created once connection is established.
792 * @param app_index Index of the application requesting the connect
793 * @param st Session type requested.
794 * @param tep Remote transport endpoint
795 * @param res Resulting transport connection .
798 stream_session_open (u32 app_index, session_type_t st,
799 transport_endpoint_t * tep,
800 transport_connection_t ** res)
802 transport_connection_t *tc;
806 rv = tp_vfts[st].open (&tep->ip, tep->port);
809 clib_warning ("Transport failed to open connection.");
810 return VNET_API_ERROR_SESSION_CONNECT_FAIL;
813 tc = tp_vfts[st].get_half_open ((u32) rv);
815 /* Save app and tc index. The latter is needed to help establish the
816 * connection while the former is needed when the connect notify comes
817 * and we have to notify the external app */
818 handle = (((u64) app_index) << 32) | (u64) tc->c_index;
820 /* Add to the half-open lookup table */
821 stream_session_half_open_table_add (st, tc, handle);
829 * Ask transport to listen on local transport endpoint.
831 * @param s Session for which listen will be called. Note that unlike
832 * established sessions, listen sessions are not associated to a
834 * @param tep Local endpoint to be listened on.
837 stream_session_listen (stream_session_t * s, transport_endpoint_t * tep)
839 transport_connection_t *tc;
842 /* Transport bind/listen */
843 tci = tp_vfts[s->session_type].bind (s->session_index, &tep->ip, tep->port);
845 if (tci == (u32) ~ 0)
848 /* Attach transport to session */
849 s->connection_index = tci;
850 tc = tp_vfts[s->session_type].get_listener (tci);
852 /* Weird but handle it ... */
856 /* Add to the main lookup table */
857 stream_session_table_add_for_tc (tc, s->session_index);
863 * Ask transport to stop listening on local transport endpoint.
865 * @param s Session to stop listening on. It must be in state LISTENING.
868 stream_session_stop_listen (stream_session_t * s)
870 transport_connection_t *tc;
872 if (s->session_state != SESSION_STATE_LISTENING)
874 clib_warning ("not a listening session");
878 tc = tp_vfts[s->session_type].get_listener (s->connection_index);
881 clib_warning ("no transport");
882 return VNET_API_ERROR_ADDRESS_NOT_IN_USE;
885 stream_session_table_del_for_tc (tc);
886 tp_vfts[s->session_type].unbind (s->connection_index);
891 session_send_session_evt_to_thread (u64 session_handle,
892 fifo_event_type_t evt_type,
895 static u16 serial_number = 0;
896 session_fifo_event_t evt;
897 unix_shared_memory_queue_t *q;
899 /* Fabricate event */
900 evt.session_handle = session_handle;
901 evt.event_type = evt_type;
902 evt.event_id = serial_number++;
904 q = session_manager_get_vpp_event_queue (thread_index);
906 /* Based on request block (or not) for lack of space */
907 if (PREDICT_TRUE (q->cursize < q->maxsize))
908 unix_shared_memory_queue_add (q, (u8 *) & evt,
909 0 /* do wait for mutex */ );
912 clib_warning ("queue full");
918 * Disconnect session and propagate to transport. This should eventually
919 * result in a delete notification that allows us to cleanup session state.
920 * Called for both active/passive disconnects.
922 * Should be called from the session's thread.
925 stream_session_disconnect (stream_session_t * s)
927 s->session_state = SESSION_STATE_CLOSED;
928 tp_vfts[s->session_type].close (s->connection_index, s->thread_index);
932 * Cleanup transport and session state.
934 * Notify transport of the cleanup, wait for a delete notify to actually
935 * remove the session state.
938 stream_session_cleanup (stream_session_t * s)
940 session_manager_main_t *smm = &session_manager_main;
943 s->session_state = SESSION_STATE_CLOSED;
945 /* Delete from the main lookup table to avoid more enqueues */
946 rv = stream_session_table_del (smm, s);
948 clib_warning ("hash delete error, rv %d", rv);
950 tp_vfts[s->session_type].cleanup (s->connection_index, s->thread_index);
954 session_register_transport (u8 type, const transport_proto_vft_t * vft)
956 session_manager_main_t *smm = vnet_get_session_manager_main ();
958 vec_validate (tp_vfts, type);
959 tp_vfts[type] = *vft;
961 /* If an offset function is provided, then peek instead of dequeue */
962 smm->session_tx_fns[type] =
963 (vft->tx_fifo_offset) ? session_tx_fifo_peek_and_snd :
964 session_tx_fifo_dequeue_and_snd;
967 transport_proto_vft_t *
968 session_get_transport_vft (u8 type)
970 if (type >= vec_len (tp_vfts))
972 return &tp_vfts[type];
976 * Allocate vpp event queue (once) per worker thread
979 session_vpp_event_queue_allocate (session_manager_main_t * smm,
982 api_main_t *am = &api_main;
985 if (smm->vpp_event_queues[thread_index] == 0)
987 /* Allocate event fifo in the /vpe-api shared-memory segment */
988 oldheap = svm_push_data_heap (am->vlib_rp);
990 smm->vpp_event_queues[thread_index] =
991 unix_shared_memory_queue_init (2048 /* nels $$$$ config */ ,
992 sizeof (session_fifo_event_t),
993 0 /* consumer pid */ ,
995 /* (do not) send signal when queue non-empty */
998 svm_pop_heap (oldheap);
1002 static clib_error_t *
1003 session_manager_main_enable (vlib_main_t * vm)
1005 session_manager_main_t *smm = &session_manager_main;
1006 vlib_thread_main_t *vtm = vlib_get_thread_main ();
1010 num_threads = 1 /* main thread */ + vtm->n_threads;
1012 if (num_threads < 1)
1013 return clib_error_return (0, "n_thread_stacks not set");
1015 /* $$$ config parameters */
1016 svm_fifo_segment_init (0x200000000ULL /* first segment base VA */ ,
1017 20 /* timeout in seconds */ );
1019 /* configure per-thread ** vectors */
1020 vec_validate (smm->sessions, num_threads - 1);
1021 vec_validate (smm->session_indices_to_enqueue_by_thread, num_threads - 1);
1022 vec_validate (smm->tx_buffers, num_threads - 1);
1023 vec_validate (smm->fifo_events, num_threads - 1);
1024 vec_validate (smm->evts_partially_read, num_threads - 1);
1025 vec_validate (smm->current_enqueue_epoch, num_threads - 1);
1026 vec_validate (smm->vpp_event_queues, num_threads - 1);
1029 vec_validate (smm->last_event_poll_by_thread, num_threads - 1);
1032 /* Allocate vpp event queues */
1033 for (i = 0; i < vec_len (smm->vpp_event_queues); i++)
1034 session_vpp_event_queue_allocate (smm, i);
1036 /* $$$$ preallocate hack config parameter */
1037 for (i = 0; i < 200000; i++)
1039 stream_session_t *ss;
1040 pool_get (smm->sessions[0], ss);
1041 memset (ss, 0, sizeof (*ss));
1044 for (i = 0; i < 200000; i++)
1045 pool_put_index (smm->sessions[0], i);
1047 clib_bihash_init_16_8 (&smm->v4_session_hash, "v4 session table",
1048 200000 /* $$$$ config parameter nbuckets */ ,
1049 (64 << 20) /*$$$ config parameter table size */ );
1050 clib_bihash_init_48_8 (&smm->v6_session_hash, "v6 session table",
1051 200000 /* $$$$ config parameter nbuckets */ ,
1052 (64 << 20) /*$$$ config parameter table size */ );
1054 clib_bihash_init_16_8 (&smm->v4_half_open_hash, "v4 half-open table",
1055 200000 /* $$$$ config parameter nbuckets */ ,
1056 (64 << 20) /*$$$ config parameter table size */ );
1057 clib_bihash_init_48_8 (&smm->v6_half_open_hash, "v6 half-open table",
1058 200000 /* $$$$ config parameter nbuckets */ ,
1059 (64 << 20) /*$$$ config parameter table size */ );
1061 smm->is_enabled = 1;
1063 /* Enable TCP transport */
1064 vnet_tcp_enable_disable (vm, 1);
1070 session_node_enable_disable (u8 is_en)
1072 u8 state = is_en ? VLIB_NODE_STATE_POLLING : VLIB_NODE_STATE_DISABLED;
1074 foreach_vlib_main (({
1075 vlib_node_set_state (this_vlib_main, session_queue_node.index,
1082 vnet_session_enable_disable (vlib_main_t * vm, u8 is_en)
1086 if (session_manager_main.is_enabled)
1089 session_node_enable_disable (is_en);
1091 return session_manager_main_enable (vm);
1095 session_manager_main.is_enabled = 0;
1096 session_node_enable_disable (is_en);
1103 session_manager_main_init (vlib_main_t * vm)
1105 session_manager_main_t *smm = &session_manager_main;
1107 smm->vlib_main = vm;
1108 smm->vnet_main = vnet_get_main ();
1109 smm->is_enabled = 0;
1114 VLIB_INIT_FUNCTION (session_manager_main_init)
1116 * fd.io coding-style-patch-verification: ON
1119 * eval: (c-set-style "gnu")