/* * Copyright (c) 2017 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. */ /** * @file * @brief Session and session manager */ #include <vnet/session/session.h> #include <vlibmemory/api.h> #include <vnet/dpo/load_balance.h> #include <vnet/fib/ip4_fib.h> #include <vnet/session/application.h> /** * Per-type vector of transport protocol virtual function tables */ static transport_proto_vft_t *tp_vfts; session_manager_main_t session_manager_main; /* * Session lookup key; (src-ip, dst-ip, src-port, dst-port, session-type) * Value: (owner thread index << 32 | session_index); */ static void stream_session_table_add_for_tc (u8 sst, transport_connection_t * tc, u64 value) { session_manager_main_t *smm = &session_manager_main; session_kv4_t kv4; session_kv6_t kv6; switch (sst) { case SESSION_TYPE_IP4_UDP: case SESSION_TYPE_IP4_TCP: make_v4_ss_kv_from_tc (&kv4, tc); kv4.value = value; clib_bihash_add_del_16_8 (&smm->v4_session_hash, &kv4, 1 /* is_add */ ); break; case SESSION_TYPE_IP6_UDP: case SESSION_TYPE_IP6_TCP: make_v6_ss_kv_from_tc (&kv6, tc); kv6.value = value; clib_bihash_add_del_48_8 (&smm->v6_session_hash, &kv6, 1 /* is_add */ ); break; default: clib_warning ("Session type not supported"); ASSERT (0); } } void stream_session_table_add (session_manager_main_t * smm, stream_session_t * s, u64 value) { transport_connection_t *tc; tc = tp_vfts[s->session_type].get_connection (s->connection_index, s->thread_index); stream_session_table_add_for_tc (s->session_type, tc, value); } static void stream_session_half_open_table_add (u8 sst, transport_connection_t * tc, u64 value) { session_manager_main_t *smm = &session_manager_main; session_kv4_t kv4; session_kv6_t kv6; switch (sst) { case SESSION_TYPE_IP4_UDP: case SESSION_TYPE_IP4_TCP: make_v4_ss_kv_from_tc (&kv4, tc); kv4.value = value; clib_bihash_add_del_16_8 (&smm->v4_half_open_hash, &kv4, 1 /* is_add */ ); break; case SESSION_TYPE_IP6_UDP: case SESSION_TYPE_IP6_TCP: make_v6_ss_kv_from_tc (&kv6, tc); kv6.value = value; clib_bihash_add_del_48_8 (&smm->v6_half_open_hash, &kv6, 1 /* is_add */ ); break; default: clib_warning ("Session type not supported"); ASSERT (0); } } static int stream_session_table_del_for_tc (session_manager_main_t * smm, u8 sst, transport_connection_t * tc) { session_kv4_t kv4; session_kv6_t kv6; switch (sst) { case SESSION_TYPE_IP4_UDP: case SESSION_TYPE_IP4_TCP: make_v4_ss_kv_from_tc (&kv4, tc); return clib_bihash_add_del_16_8 (&smm->v4_session_hash, &kv4, 0 /* is_add */ ); break; case SESSION_TYPE_IP6_UDP: case SESSION_TYPE_IP6_TCP: make_v6_ss_kv_from_tc (&kv6, tc); return clib_bihash_add_del_48_8 (&smm->v6_session_hash, &kv6, 0 /* is_add */ ); break; default: clib_warning ("Session type not supported"); ASSERT (0); } return 0; } static int stream_session_table_del (session_manager_main_t * smm, stream_session_t * s) { transport_connection_t *ts; ts = tp_vfts[s->session_type].get_connection (s->connection_index, s->thread_index); return stream_session_table_del_for_tc (smm, s->session_type, ts); } static void stream_session_half_open_table_del (session_manager_main_t * smm, u8 sst, transport_connection_t * tc) { session_kv4_t kv4; session_kv6_t kv6; switch (sst) { case SESSION_TYPE_IP4_UDP: case SESSION_TYPE_IP4_TCP: make_v4_ss_kv_from_tc (&kv4, tc); clib_bihash_add_del_16_8 (&smm->v4_half_open_hash, &kv4, 0 /* is_add */ ); break; case SESSION_TYPE_IP6_UDP: case SESSION_TYPE_IP6_TCP: make_v6_ss_kv_from_tc (&kv6, tc); clib_bihash_add_del_48_8 (&smm->v6_half_open_hash, &kv6, 0 /* is_add */ ); break; default: clib_warning ("Session type not supported"); ASSERT (0); } } stream_session_t * stream_session_lookup_listener4 (ip4_address_t * lcl, u16 lcl_port, u8 proto) { session_manager_main_t *smm = &session_manager_main; session_kv4_t kv4; int rv; make_v4_listener_kv (&kv4, lcl, lcl_port, proto); rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4); if (rv == 0) return pool_elt_at_index (smm->listen_sessions[proto], (u32) kv4.value); /* Zero out the lcl ip */ kv4.key[0] = 0; rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4); if (rv == 0) return pool_elt_at_index (smm->listen_sessions[proto], kv4.value); return 0; } /** Looks up a session based on the 5-tuple passed as argument. * * First it tries to find an established session, if this fails, it tries * finding a listener session if this fails, it tries a lookup with a * wildcarded local source (listener bound to all interfaces) */ stream_session_t * stream_session_lookup4 (ip4_address_t * lcl, ip4_address_t * rmt, u16 lcl_port, u16 rmt_port, u8 proto, u32 my_thread_index) { session_manager_main_t *smm = &session_manager_main; session_kv4_t kv4; int rv; /* Lookup session amongst established ones */ make_v4_ss_kv (&kv4, lcl, rmt, lcl_port, rmt_port, proto); rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4); if (rv == 0) return stream_session_get_tsi (kv4.value, my_thread_index); /* If nothing is found, check if any listener is available */ return stream_session_lookup_listener4 (lcl, lcl_port, proto); } stream_session_t * stream_session_lookup_listener6 (ip6_address_t * lcl, u16 lcl_port, u8 proto) { session_manager_main_t *smm = &session_manager_main; session_kv6_t kv6; int rv; make_v6_listener_kv (&kv6, lcl, lcl_port, proto); rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6); if (rv == 0) return pool_elt_at_index (smm->listen_sessions[proto], kv6.value); /* Zero out the lcl ip */ kv6.key[0] = kv6.key[1] = 0; rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6); if (rv == 0) return pool_elt_at_index (smm->listen_sessions[proto], kv6.value); return 0; } /* Looks up a session based on the 5-tuple passed as argument. * First it tries to find an established session, if this fails, it tries * finding a listener session if this fails, it tries a lookup with a * wildcarded local source (listener bound to all interfaces) */ stream_session_t * stream_session_lookup6 (ip6_address_t * lcl, ip6_address_t * rmt, u16 lcl_port, u16 rmt_port, u8 proto, u32 my_thread_index) { session_manager_main_t *smm = vnet_get_session_manager_main (); session_kv6_t kv6; int rv; make_v6_ss_kv (&kv6, lcl, rmt, lcl_port, rmt_port, proto); rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6); if (rv == 0) return stream_session_get_tsi (kv6.value, my_thread_index); /* If nothing is found, check if any listener is available */ return stream_session_lookup_listener6 (lcl, lcl_port, proto); } stream_session_t * stream_session_lookup_listener (ip46_address_t * lcl, u16 lcl_port, u8 proto) { switch (proto) { case SESSION_TYPE_IP4_UDP: case SESSION_TYPE_IP4_TCP: return stream_session_lookup_listener4 (&lcl->ip4, lcl_port, proto); break; case SESSION_TYPE_IP6_UDP: case SESSION_TYPE_IP6_TCP: return stream_session_lookup_listener6 (&lcl->ip6, lcl_port, proto); break; } return 0; } static u64 stream_session_half_open_lookup (session_manager_main_t * smm, ip46_address_t * lcl, ip46_address_t * rmt, u16 lcl_port, u16 rmt_port, u8 proto) { session_kv4_t kv4; session_kv6_t kv6; int rv; switch (proto) { case SESSION_TYPE_IP4_UDP: case SESSION_TYPE_IP4_TCP: make_v4_ss_kv (&kv4, &lcl->ip4, &rmt->ip4, lcl_port, rmt_port, proto); rv = clib_bihash_search_inline_16_8 (&smm->v4_half_open_hash, &kv4); if (rv == 0) return kv4.value; return (u64) ~ 0; break; case SESSION_TYPE_IP6_UDP: case SESSION_TYPE_IP6_TCP: make_v6_ss_kv (&kv6, &lcl->ip6, &rmt->ip6, lcl_port, rmt_port, proto); rv = clib_bihash_search_inline_48_8 (&smm->v6_half_open_hash, &kv6); if (rv == 0) return kv6.value; return (u64) ~ 0; break; } return 0; } transport_connection_t * stream_session_lookup_transport4 (session_manager_main_t * smm, ip4_address_t * lcl, ip4_address_t * rmt, u16 lcl_port, u16 rmt_port, u8 proto, u32 my_thread_index) { session_kv4_t kv4; stream_session_t *s; int rv; /* Lookup session amongst established ones */ make_v4_ss_kv (&kv4, lcl, rmt, lcl_port, rmt_port, proto); rv = clib_bihash_search_inline_16_8 (&smm->v4_session_hash, &kv4); if (rv == 0) { s = stream_session_get_tsi (kv4.value, my_thread_index); return tp_vfts[s->session_type].get_connection (s->connection_index, my_thread_index); } /* If nothing is found, check if any listener is available */ s = stream_session_lookup_listener4 (lcl, lcl_port, proto); if (s) return tp_vfts[s->session_type].get_listener (s->connection_index); /* Finally, try half-open connections */ rv = clib_bihash_search_inline_16_8 (&smm->v4_half_open_hash, &kv4); if (rv == 0) return tp_vfts[proto].get_half_open (kv4.value & 0xFFFFFFFF); return 0; } transport_connection_t * stream_session_lookup_transport6 (session_manager_main_t * smm, ip6_address_t * lcl, ip6_address_t * rmt, u16 lcl_port, u16 rmt_port, u8 proto, u32 my_thread_index) { stream_session_t *s; session_kv6_t kv6; int rv; make_v6_ss_kv (&kv6, lcl, rmt, lcl_port, rmt_port, proto); rv = clib_bihash_search_inline_48_8 (&smm->v6_session_hash, &kv6); if (rv == 0) { s = stream_session_get_tsi (kv6.value, my_thread_index); return tp_vfts[s->session_type].get_connection (s->connection_index, my_thread_index); } /* If nothing is found, check if any listener is available */ s = stream_session_lookup_listener6 (lcl, lcl_port, proto); if (s) return tp_vfts[s->session_type].get_listener (s->connection_index); /* Finally, try half-open connections */ rv = clib_bihash_search_inline_48_8 (&smm->v6_half_open_hash, &kv6); if (rv == 0) return tp_vfts[s->session_type].get_half_open (kv6.value & 0xFFFFFFFF); return 0; } /** * Allocate vpp event queue (once) per worker thread */ void vpp_session_event_queue_allocate (session_manager_main_t * smm, u32 thread_index) { api_main_t *am = &api_main; void *oldheap; if (smm->vpp_event_queues[thread_index] == 0) { /* Allocate event fifo in the /vpe-api shared-memory segment */ oldheap = svm_push_data_heap (am->vlib_rp); smm->vpp_event_queues[thread_index] = unix_shared_memory_queue_init (2048 /* nels $$$$ config */ , sizeof (session_fifo_event_t), 0 /* consumer pid */ , 0 /* (do not) send signal when queue non-empty */ ); svm_pop_heap (oldheap); } } void session_manager_get_segment_info (u32 index, u8 ** name, u32 * size) { svm_fifo_segment_private_t *s; s = svm_fifo_get_segment (index); *name = s->h->segment_name; *size = s->ssvm.ssvm_size; } always_inline int session_manager_add_segment_i (session_manager_main_t * smm, session_manager_t * sm, u32 segment_size, u8 * segment_name) { svm_fifo_segment_create_args_t _ca, *ca = &_ca; int rv; memset (ca, 0, sizeof (*ca)); ca->segment_name = (char *) segment_name; ca->segment_size = segment_size; rv = svm_fifo_segment_create (ca); if (rv) { clib_warning ("svm_fifo_segment_create ('%s', %d) failed", ca->segment_name, ca->segment_size); vec_free (segment_name); return -1; } vec_add1 (sm->segment_indices, ca->new_segment_index); return 0; } static int session_manager_add_segment (session_manager_main_t * smm, session_manager_t * sm) { u8 *segment_name; svm_fifo_segment_create_args_t _ca, *ca = &_ca; u32 add_segment_size; u32 default_segment_size = 128 << 10; memset (ca, 0, sizeof (*ca)); segment_name = format (0, "%d-%d%c", getpid (), smm->unique_segment_name_counter++, 0); add_segment_size = sm->add_segment_size ? sm->add_segment_size : default_segment_size; return session_manager_add_segment_i (smm, sm, add_segment_size, segment_name); } int session_manager_add_first_segment (session_manager_main_t * smm, session_manager_t * sm, u32 segment_size, u8 ** segment_name) { svm_fifo_segment_create_args_t _ca, *ca = &_ca; memset (ca, 0, sizeof (*ca)); *segment_name = format (0, "%d-%d%c", getpid (), smm->unique_segment_name_counter++, 0); return session_manager_add_segment_i (smm, sm, segment_size, *segment_name); } void session_manager_del (session_manager_main_t * smm, session_manager_t * sm) { u32 *deleted_sessions = 0; u32 *deleted_thread_indices = 0; int i, j; /* Across all fifo segments used by the server */ for (j = 0; j < vec_len (sm->segment_indices); j++) { svm_fifo_segment_private_t *fifo_segment; svm_fifo_t **fifos; /* Vector of fifos allocated in the segment */ fifo_segment = svm_fifo_get_segment (sm->segment_indices[j]); fifos = (svm_fifo_t **) fifo_segment->h->fifos; /* * Remove any residual sessions from the session lookup table * Don't bother deleting the individual fifos, we're going to * throw away the fifo segment in a minute. */ for (i = 0; i < vec_len (fifos); i++) { svm_fifo_t *fifo; u32 session_index, thread_index; stream_session_t *session; fifo = fifos[i]; session_index = fifo->server_session_index; thread_index = fifo->server_thread_index; session = pool_elt_at_index (smm->sessions[thread_index], session_index); /* Add to the deleted_sessions vector (once!) */ if (!session->is_deleted) { session->is_deleted = 1; vec_add1 (deleted_sessions, session - smm->sessions[thread_index]); vec_add1 (deleted_thread_indices, thread_index); } } for (i = 0; i < vec_len (deleted_sessions); i++) { stream_session_t *session; session = pool_elt_at_index (smm->sessions[deleted_thread_indices[i]], deleted_sessions[i]); /* Instead of directly removing the session call disconnect */ stream_session_disconnect (session); /* stream_session_table_del (smm, session); pool_put(smm->sessions[deleted_thread_indices[i]], session); */ } vec_reset_length (deleted_sessions); vec_reset_length (deleted_thread_indices); /* Instead of removing the segment, test when removing the session if * the segment can be removed */ /* svm_fifo_segment_delete (fifo_segment); */ } vec_free (deleted_sessions); vec_free (deleted_thread_indices); } int session_manager_allocate_session_fifos (session_manager_main_t * smm, session_manager_t * sm, svm_fifo_t ** server_rx_fifo, svm_fifo_t ** server_tx_fifo, u32 * fifo_segment_index, u8 * added_a_segment) { svm_fifo_segment_private_t *fifo_segment; u32 fifo_size, default_fifo_size = 8192 /* TODO config */ ; int i; *added_a_segment = 0; /* Allocate svm fifos */ ASSERT (vec_len (sm->segment_indices)); again: for (i = 0; i < vec_len (sm->segment_indices); i++) { *fifo_segment_index = sm->segment_indices[i]; fifo_segment = svm_fifo_get_segment (*fifo_segment_index); fifo_size = sm->rx_fifo_size; fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size; *server_rx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size); fifo_size = sm->tx_fifo_size; fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size; *server_tx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size); if (*server_rx_fifo == 0) { /* This would be very odd, but handle it... */ if (*server_tx_fifo != 0) { svm_fifo_segment_free_fifo (fifo_segment, *server_tx_fifo); *server_tx_fifo = 0; } continue; } if (*server_tx_fifo == 0) { if (*server_rx_fifo != 0) { svm_fifo_segment_free_fifo (fifo_segment, *server_rx_fifo); *server_rx_fifo = 0; } continue; } break; } /* See if we're supposed to create another segment */ if (*server_rx_fifo == 0) { if (sm->add_segment) { if (*added_a_segment) { clib_warning ("added a segment, still cant allocate a fifo"); return SESSION_ERROR_NEW_SEG_NO_SPACE; } if (session_manager_add_segment (smm, sm)) return VNET_API_ERROR_URI_FIFO_CREATE_FAILED; *added_a_segment = 1; goto again; } else return SESSION_ERROR_NO_SPACE; } return 0; } int stream_session_create_i (session_manager_main_t * smm, application_t * app, transport_connection_t * tc, stream_session_t ** ret_s) { int rv; svm_fifo_t *server_rx_fifo = 0, *server_tx_fifo = 0; u32 fifo_segment_index; u32 pool_index, seg_size; stream_session_t *s; u64 value; u32 thread_index = tc->thread_index; session_manager_t *sm; u8 segment_added; u8 *seg_name; sm = session_manager_get (app->session_manager_index); /* Check the API queue */ if (app->mode == APP_SERVER && application_api_queue_is_full (app)) return SESSION_ERROR_API_QUEUE_FULL; if ((rv = session_manager_allocate_session_fifos (smm, sm, &server_rx_fifo, &server_tx_fifo, &fifo_segment_index, &segment_added))) return rv; if (segment_added && app->mode == APP_SERVER) { /* Send an API message to the external server, to map new segment */ ASSERT (app->cb_fns.add_segment_callback); session_manager_get_segment_info (fifo_segment_index, &seg_name, &seg_size); if (app->cb_fns.add_segment_callback (app->api_client_index, seg_name, seg_size)) return VNET_API_ERROR_URI_FIFO_CREATE_FAILED; } /* Create the session */ pool_get (smm->sessions[thread_index], s); memset (s, 0, sizeof (*s)); /* Initialize backpointers */ pool_index = s - smm->sessions[thread_index]; server_rx_fifo->server_session_index = pool_index; server_rx_fifo->server_thread_index = thread_index; server_tx_fifo->server_session_index = pool_index; server_tx_fifo->server_thread_index = thread_index; s->server_rx_fifo = server_rx_fifo; s->server_tx_fifo = server_tx_fifo; /* Initialize state machine, such as it is... */ s->session_type = app->session_type; s->session_state = SESSION_STATE_CONNECTING; s->app_index = application_get_index (app); s->server_segment_index = fifo_segment_index; s->thread_index = thread_index; s->session_index = pool_index; /* Attach transport to session */ s->connection_index = tc->c_index; /* Attach session to transport */ tc->s_index = s->session_index; /* Add to the main lookup table */ value = (((u64) thread_index) << 32) | (u64) s->session_index; stream_session_table_add_for_tc (app->session_type, tc, value); *ret_s = s; return 0; } /* * Enqueue data for delivery to session peer. Does not notify peer of enqueue * event but on request can queue notification events for later delivery by * calling stream_server_flush_enqueue_events(). * * @param tc Transport connection which is to be enqueued data * @param data Data to be enqueued * @param len Length of data to be enqueued * @param queue_event Flag to indicate if peer is to be notified or if event * is to be queued. The former is useful when more data is * enqueued and only one event is to be generated. * @return Number of bytes enqueued or a negative value if enqueueing failed. */ int stream_session_enqueue_data (transport_connection_t * tc, u8 * data, u16 len, u8 queue_event) { stream_session_t *s; int enqueued; s = stream_session_get (tc->s_index, tc->thread_index); /* Make sure there's enough space left. We might've filled the pipes */ if (PREDICT_FALSE (len > svm_fifo_max_enqueue (s->server_rx_fifo))) return -1; enqueued = svm_fifo_enqueue_nowait (s->server_rx_fifo, s->pid, len, data); if (queue_event) { /* Queue RX event on this fifo. Eventually these will need to be flushed * by calling stream_server_flush_enqueue_events () */ session_manager_main_t *smm = vnet_get_session_manager_main (); u32 thread_index = s->thread_index; u32 my_enqueue_epoch = smm->current_enqueue_epoch[thread_index]; if (s->enqueue_epoch != my_enqueue_epoch) { s->enqueue_epoch = my_enqueue_epoch; vec_add1 (smm->session_indices_to_enqueue_by_thread[thread_index], s - smm->sessions[thread_index]); } } return enqueued; } /** Check if we have space in rx fifo to push more bytes */ u8 stream_session_no_space (transport_connection_t * tc, u32 thread_index, u16 data_len) { stream_session_t *s = stream_session_get (tc->c_index, thread_index); if (PREDICT_FALSE (s->session_state != SESSION_STATE_READY)) return 1; if (data_len > svm_fifo_max_enqueue (s->server_rx_fifo)) return 1; return 0; } u32 stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer, u32 offset, u32 max_bytes) { stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index); return svm_fifo_peek (s->server_tx_fifo, s->pid, offset, max_bytes, buffer); } u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes) { stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index); return svm_fifo_dequeue_drop (s->server_tx_fifo, s->pid, max_bytes); } /** * Notify session peer that new data has been enqueued. * * @param s Stream session for which the event is to be generated. * @param block Flag to indicate if call should block if event queue is full. * * @return 0 on succes or negative number if failed to send notification. */ static int stream_session_enqueue_notify (stream_session_t * s, u8 block) { application_t *app; session_fifo_event_t evt; unix_shared_memory_queue_t *q; static u32 serial_number; if (PREDICT_FALSE (s->session_state == SESSION_STATE_CLOSED)) return 0; /* Get session's server */ app = application_get (s->app_index); /* Fabricate event */ evt.fifo = s->server_rx_fifo; evt.event_type = FIFO_EVENT_SERVER_RX; evt.event_id = serial_number++; evt.enqueue_length = svm_fifo_max_dequeue (s->server_rx_fifo); /* Add event to server's event queue */ q = app->event_queue; /* Based on request block (or not) for lack of space */ if (block || PREDICT_TRUE (q->cursize < q->maxsize)) unix_shared_memory_queue_add (app->event_queue, (u8 *) & evt, 0 /* do wait for mutex */ ); else return -1; if (1) { ELOG_TYPE_DECLARE (e) = { .format = "evt-enqueue: id %d length %d",.format_args = "i4i4",}; struct { u32 data[2]; } *ed; ed = ELOG_DATA (&vlib_global_main.elog_main, e); ed->data[0] = evt.event_id; ed->data[1] = evt.enqueue_length; } return 0; } /** * Flushes queue of sessions that are to be notified of new data * enqueued events. * * @param thread_index Thread index for which the flush is to be performed. * @return 0 on success or a positive number indicating the number of * failures due to API queue being full. */ int session_manager_flush_enqueue_events (u32 thread_index) { session_manager_main_t *smm = &session_manager_main; u32 *session_indices_to_enqueue; int i, errors = 0; session_indices_to_enqueue = smm->session_indices_to_enqueue_by_thread[thread_index]; for (i = 0; i < vec_len (session_indices_to_enqueue); i++) { stream_session_t *s0; /* Get session */ s0 = stream_session_get (session_indices_to_enqueue[i], thread_index); if (stream_session_enqueue_notify (s0, 0 /* don't block */ )) { errors++; } } vec_reset_length (session_indices_to_enqueue); smm->session_indices_to_enqueue_by_thread[thread_index] = session_indices_to_enqueue; /* Increment enqueue epoch for next round */ smm->current_enqueue_epoch[thread_index]++; return errors; } /* * Start listening on server's ip/port pair for requested transport. * * Creates a 'dummy' stream session with state LISTENING to be used in session * lookups, prior to establishing connection. Requests transport to build * it's own specific listening connection. */ int stream_session_start_listen (u32 server_index, ip46_address_t * ip, u16 port) { session_manager_main_t *smm = &session_manager_main; stream_session_t *s; transport_connection_t *tc; application_t *srv; u32 tci; srv = application_get (server_index); pool_get (smm->listen_sessions[srv->session_type], s); memset (s, 0, sizeof (*s)); s->session_type = srv->session_type; s->session_state = SESSION_STATE_LISTENING; s->session_index = s - smm->listen_sessions[srv->session_type]; s->app_index = srv->index; /* Transport bind/listen */ tci = tp_vfts[srv->session_type].bind (smm->vlib_main, s->session_index, ip, port); /* Attach transport to session */ s->connection_index = tci; tc = tp_vfts[srv->session_type].get_listener (tci); srv->session_index = s->session_index; /* Add to the main lookup table */ stream_session_table_add_for_tc (s->session_type, tc, s->session_index); return 0; } void stream_session_stop_listen (u32 server_index) { session_manager_main_t *smm = &session_manager_main; stream_session_t *listener; transport_connection_t *tc; application_t *srv; srv = application_get (server_index); listener = pool_elt_at_index (smm->listen_sessions[srv->session_type], srv->session_index); tc = tp_vfts[srv->session_type].get_listener (listener->connection_index); stream_session_table_del_for_tc (smm, listener->session_type, tc); tp_vfts[srv->session_type].unbind (smm->vlib_main, listener->connection_index); pool_put (smm->listen_sessions[srv->session_type], listener); } int connect_server_add_segment_cb (application_t * ss, char *segment_name, u32 segment_size) { /* Does exactly nothing, but die */ ASSERT (0); return 0; } void connects_session_manager_init (session_manager_main_t * smm, u8 session_type) { session_manager_t *sm; u32 connect_fifo_size = 8 << 10; /* Config? */ u32 default_segment_size = 1 << 20; pool_get (smm->session_managers, sm); memset (sm, 0, sizeof (*sm)); sm->add_segment_size = default_segment_size; sm->rx_fifo_size = connect_fifo_size; sm->tx_fifo_size = connect_fifo_size; sm->add_segment = 1; session_manager_add_segment (smm, sm); smm->connect_manager_index[session_type] = sm - smm->session_managers; } void stream_session_connect_notify (transport_connection_t * tc, u8 sst, u8 is_fail) { session_manager_main_t *smm = &session_manager_main; application_t *app; stream_session_t *new_s = 0; u64 value; value = stream_session_half_open_lookup (smm, &tc->lcl_ip, &tc->rmt_ip, tc->lcl_port, tc->rmt_port, tc->proto); if (value == HALF_OPEN_LOOKUP_INVALID_VALUE) { clib_warning ("This can't be good!"); return; } app = application_get (value >> 32); if (!is_fail) { /* Create new session (server segments are allocated if needed) */ if (stream_session_create_i (smm, app, tc, &new_s)) return; app->session_index = stream_session_get_index (new_s); app->thread_index = new_s->thread_index; /* Allocate vpp event queue for this thread if needed */ vpp_session_event_queue_allocate (smm, tc->thread_index); } /* Notify client */ app->cb_fns.session_connected_callback (app->api_client_index, new_s, is_fail); /* Cleanup session lookup */ stream_session_half_open_table_del (smm, sst, tc); } void stream_session_accept_notify (transport_connection_t * tc) { application_t *server; stream_session_t *s; s = stream_session_get (tc->s_index, tc->thread_index); server = application_get (s->app_index); server->cb_fns.session_accept_callback (s); } /** * Notification from transport that connection is being closed. * * A disconnect is sent to application but state is not removed. Once * disconnect is acknowledged by application, session disconnect is called. * Ultimately this leads to close being called on transport (passive close). */ void stream_session_disconnect_notify (transport_connection_t * tc) { application_t *server; stream_session_t *s; s = stream_session_get (tc->s_index, tc->thread_index); server = application_get (s->app_index); server->cb_fns.session_disconnect_callback (s); } /** * Cleans up session and associated app if needed. */ void stream_session_delete (stream_session_t * s) { session_manager_main_t *smm = vnet_get_session_manager_main (); svm_fifo_segment_private_t *fifo_segment; application_t *app; int rv; /* delete from the main lookup table */ rv = stream_session_table_del (smm, s); if (rv) clib_warning ("hash delete error, rv %d", rv); /* Cleanup fifo segments */ fifo_segment = svm_fifo_get_segment (s->server_segment_index); svm_fifo_segment_free_fifo (fifo_segment, s->server_rx_fifo); svm_fifo_segment_free_fifo (fifo_segment, s->server_tx_fifo); /* Cleanup app if client */ app = application_get (s->app_index); if (app->mode == APP_CLIENT) { application_del (app); } else if (app->mode == APP_SERVER) { session_manager_t *sm; svm_fifo_segment_private_t *fifo_segment; svm_fifo_t **fifos; u32 fifo_index; sm = session_manager_get (app->session_manager_index); /* Delete fifo */ fifo_segment = svm_fifo_get_segment (s->server_segment_index); fifos = (svm_fifo_t **) fifo_segment->h->fifos; fifo_index = svm_fifo_segment_index (fifo_segment); /* Remove segment only if it holds no fifos and not the first */ if (sm->segment_indices[0] != fifo_index && vec_len (fifos) == 0) svm_fifo_segment_delete (fifo_segment); } pool_put (smm->sessions[s->thread_index], s); } /** * Notification from transport that connection is being deleted * * This should be called only on previously fully established sessions. For * instance failed connects should call stream_session_connect_notify and * indicate that the connect has failed. */ void stream_session_delete_notify (transport_connection_t * tc) { stream_session_t *s; s = stream_session_get_if_valid (tc->s_index, tc->thread_index); if (!s) { clib_warning ("Surprised!"); return; } stream_session_delete (s); } /** * Notify application that connection has been reset. */ void stream_session_reset_notify (transport_connection_t * tc) { stream_session_t *s; application_t *app; s = stream_session_get (tc->s_index, tc->thread_index); app = application_get (s->app_index); app->cb_fns.session_reset_callback (s); } /** * Accept a stream session. Optionally ping the server by callback. */ int stream_session_accept (transport_connection_t * tc, u32 listener_index, u8 sst, u8 notify) { session_manager_main_t *smm = &session_manager_main; application_t *server; stream_session_t *s, *listener; int rv; /* Find the server */ listener = pool_elt_at_index (smm->listen_sessions[sst], listener_index); server = application_get (listener->app_index); if ((rv = stream_session_create_i (smm, server, tc, &s))) return rv; /* Allocate vpp event queue for this thread if needed */ vpp_session_event_queue_allocate (smm, tc->thread_index); /* Shoulder-tap the server */ if (notify) { server->cb_fns.session_accept_callback (s); } return 0; } void stream_session_open (u8 sst, ip46_address_t * addr, u16 port_host_byte_order, u32 app_index) { transport_connection_t *tc; u32 tci; u64 value; /* Ask transport to open connection */ tci = tp_vfts[sst].open (addr, port_host_byte_order); /* Get transport connection */ tc = tp_vfts[sst].get_half_open (tci); /* Store api_client_index and transport connection index */ value = (((u64) app_index) << 32) | (u64) tc->c_index; /* Add to the half-open lookup table */ stream_session_half_open_table_add (sst, tc, value); } /** * Disconnect session and propagate to transport. This should eventually * result in a delete notification that allows us to cleanup session state. * Called for both active/passive disconnects. */ void stream_session_disconnect (stream_session_t * s) { tp_vfts[s->session_type].close (s->connection_index, s->thread_index); s->session_state = SESSION_STATE_CLOSED; } /** * Cleanup transport and session state. */ void stream_session_cleanup (stream_session_t * s) { tp_vfts[s->session_type].cleanup (s->connection_index, s->thread_index); stream_session_delete (s); } void session_register_transport (u8 type, const transport_proto_vft_t * vft) { session_manager_main_t *smm = vnet_get_session_manager_main (); vec_validate (tp_vfts, type); tp_vfts[type] = *vft; /* If an offset function is provided, then peek instead of dequeue */ smm->session_rx_fns[type] = (vft->rx_fifo_offset) ? session_fifo_rx_peek : session_fifo_rx_dequeue; } transport_proto_vft_t * session_get_transport_vft (u8 type) { if (type >= vec_len (tp_vfts)) return 0; return &tp_vfts[type]; } static clib_error_t * session_manager_main_init (vlib_main_t * vm) { u32 num_threads; vlib_thread_main_t *vtm = vlib_get_thread_main (); session_manager_main_t *smm = &session_manager_main; int i; smm->vlib_main = vm; smm->vnet_main = vnet_get_main (); num_threads = 1 /* main thread */ + vtm->n_threads; if (num_threads < 1) return clib_error_return (0, "n_thread_stacks not set"); /* $$$ config parameters */ svm_fifo_segment_init (0x200000000ULL /* first segment base VA */ , 20 /* timeout in seconds */ ); /* configure per-thread ** vectors */ vec_validate (smm->sessions, num_threads - 1); vec_validate (smm->session_indices_to_enqueue_by_thread, num_threads - 1); vec_validate (smm->tx_buffers, num_threads - 1); vec_validate (smm->fifo_events, num_threads - 1); vec_validate (smm->evts_partially_read, num_threads - 1); vec_validate (smm->current_enqueue_epoch, num_threads - 1); vec_validate (smm->vpp_event_queues, num_threads - 1); /* $$$$ preallocate hack config parameter */ for (i = 0; i < 200000; i++) { stream_session_t *ss; pool_get (smm->sessions[0], ss); memset (ss, 0, sizeof (*ss)); } for (i = 0; i < 200000; i++) pool_put_index (smm->sessions[0], i); clib_bihash_init_16_8 (&smm->v4_session_hash, "v4 session table", 200000 /* $$$$ config parameter nbuckets */ , (64 << 20) /*$$$ config parameter table size */ ); clib_bihash_init_48_8 (&smm->v6_session_hash, "v6 session table", 200000 /* $$$$ config parameter nbuckets */ , (64 << 20) /*$$$ config parameter table size */ ); clib_bihash_init_16_8 (&smm->v4_half_open_hash, "v4 half-open table", 200000 /* $$$$ config parameter nbuckets */ , (64 << 20) /*$$$ config parameter table size */ ); clib_bihash_init_48_8 (&smm->v6_half_open_hash, "v6 half-open table", 200000 /* $$$$ config parameter nbuckets */ , (64 << 20) /*$$$ config parameter table size */ ); for (i = 0; i < SESSION_N_TYPES; i++) smm->connect_manager_index[i] = INVALID_INDEX; return 0; } VLIB_INIT_FUNCTION (session_manager_main_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */