/* * Copyright (c) 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: * * 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. */ #include <vnet/session/application_local.h> #include <vnet/session/session.h> typedef enum ct_segment_flags_ { CT_SEGMENT_F_CLIENT_DETACHED = 1 << 0, CT_SEGMENT_F_SERVER_DETACHED = 1 << 1, } ct_segment_flags_t; typedef struct ct_segment_ { u32 client_n_sessions; u32 server_n_sessions; u32 seg_ctx_index; u32 ct_seg_index; u32 segment_index; ct_segment_flags_t flags; } ct_segment_t; typedef struct ct_segments_ { u32 sm_index; u32 server_wrk; u32 client_wrk; u32 fifo_pair_bytes; ct_segment_t *segments; } ct_segments_ctx_t; typedef struct ct_cleanup_req_ { u32 ct_index; } ct_cleanup_req_t; typedef struct ct_worker_ { ct_connection_t *connections; /**< Per-worker connection pools */ u32 *pending_connects; /**< Fifo of pending ho indices */ ct_cleanup_req_t *pending_cleanups; /**< Fifo of pending indices */ u8 have_connects; /**< Set if connect rpc pending */ u8 have_cleanups; /**< Set if cleanup rpc pending */ } ct_worker_t; typedef struct ct_main_ { ct_worker_t *wrk; /**< Per-worker state */ u32 n_workers; /**< Number of vpp workers */ u32 n_sessions; /**< Cumulative sessions counter */ u32 *ho_reusable; /**< Vector of reusable ho indices */ clib_spinlock_t ho_reuseable_lock; /**< Lock for reusable ho indices */ clib_rwlock_t app_segs_lock; /**< RW lock for seg contexts */ uword *app_segs_ctxs_table; /**< App handle to segment pool map */ ct_segments_ctx_t *app_seg_ctxs; /**< Pool of ct segment contexts */ } ct_main_t; static ct_main_t ct_main; static inline ct_worker_t * ct_worker_get (u32 thread_index) { return &ct_main.wrk[thread_index]; } static ct_connection_t * ct_connection_alloc (u32 thread_index) { ct_worker_t *wrk = ct_worker_get (thread_index); ct_connection_t *ct; pool_get_zero (wrk->connections, ct); ct->c_c_index = ct - wrk->connections; ct->c_thread_index = thread_index; ct->client_wrk = ~0; ct->server_wrk = ~0; ct->seg_ctx_index = ~0; ct->ct_seg_index = ~0; return ct; } static ct_connection_t * ct_connection_get (u32 ct_index, u32 thread_index) { ct_worker_t *wrk = ct_worker_get (thread_index); if (pool_is_free_index (wrk->connections, ct_index)) return 0; return pool_elt_at_index (wrk->connections, ct_index); } static void ct_connection_free (ct_connection_t * ct) { ct_worker_t *wrk = ct_worker_get (ct->c_thread_index); if (CLIB_DEBUG) { clib_memset (ct, 0xfc, sizeof (*ct)); pool_put (wrk->connections, ct); return; } pool_put (wrk->connections, ct); } static ct_connection_t * ct_half_open_alloc (void) { ct_main_t *cm = &ct_main; u32 *hip; clib_spinlock_lock (&cm->ho_reuseable_lock); vec_foreach (hip, cm->ho_reusable) pool_put_index (cm->wrk[0].connections, *hip); vec_reset_length (cm->ho_reusable); clib_spinlock_unlock (&cm->ho_reuseable_lock); return ct_connection_alloc (0); } void ct_half_open_add_reusable (u32 ho_index) { ct_main_t *cm = &ct_main; clib_spinlock_lock (&cm->ho_reuseable_lock); vec_add1 (cm->ho_reusable, ho_index); clib_spinlock_unlock (&cm->ho_reuseable_lock); } session_t * ct_session_get_peer (session_t * s) { ct_connection_t *ct, *peer_ct; ct = ct_connection_get (s->connection_index, s->thread_index); peer_ct = ct_connection_get (ct->peer_index, s->thread_index); return session_get (peer_ct->c_s_index, s->thread_index); } void ct_session_endpoint (session_t * ll, session_endpoint_t * sep) { ct_connection_t *ct; ct = (ct_connection_t *) session_get_transport (ll); sep->transport_proto = ct->actual_tp; sep->port = ct->c_lcl_port; sep->is_ip4 = ct->c_is_ip4; ip_copy (&sep->ip, &ct->c_lcl_ip, ct->c_is_ip4); } static void ct_set_invalid_app_wrk (ct_connection_t *ct, u8 is_client) { ct_connection_t *peer_ct; peer_ct = ct_connection_get (ct->peer_index, ct->c_thread_index); if (is_client) { ct->client_wrk = APP_INVALID_INDEX; if (peer_ct) ct->client_wrk = APP_INVALID_INDEX; } else { ct->server_wrk = APP_INVALID_INDEX; if (peer_ct) ct->server_wrk = APP_INVALID_INDEX; } } static void ct_session_dealloc_fifos (ct_connection_t *ct, svm_fifo_t *rx_fifo, svm_fifo_t *tx_fifo) { ct_segments_ctx_t *seg_ctx; ct_main_t *cm = &ct_main; segment_manager_t *sm; app_worker_t *app_wrk; ct_segment_t *ct_seg; fifo_segment_t *fs; u32 seg_index; session_t *s; int cnt; /* * Cleanup fifos */ sm = segment_manager_get (rx_fifo->segment_manager); seg_index = rx_fifo->segment_index; fs = segment_manager_get_segment_w_lock (sm, seg_index); fifo_segment_free_fifo (fs, rx_fifo); fifo_segment_free_fifo (fs, tx_fifo); segment_manager_segment_reader_unlock (sm); /* * Atomically update segment context with readers lock */ clib_rwlock_reader_lock (&cm->app_segs_lock); seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index); ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index); if (ct->flags & CT_CONN_F_CLIENT) { cnt = __atomic_sub_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED); } else { cnt = __atomic_sub_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED); } clib_rwlock_reader_unlock (&cm->app_segs_lock); /* * No need to do any app updates, return */ ASSERT (cnt >= 0); if (cnt) return; /* * Grab exclusive lock and update flags unless some other thread * added more sessions */ clib_rwlock_writer_lock (&cm->app_segs_lock); seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index); ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index); if (ct->flags & CT_CONN_F_CLIENT) { cnt = ct_seg->client_n_sessions; if (cnt) goto done; ct_seg->flags |= CT_SEGMENT_F_CLIENT_DETACHED; s = session_get (ct->c_s_index, ct->c_thread_index); if (s->app_wrk_index == APP_INVALID_INDEX) ct_set_invalid_app_wrk (ct, 1 /* is_client */); } else { cnt = ct_seg->server_n_sessions; if (cnt) goto done; ct_seg->flags |= CT_SEGMENT_F_SERVER_DETACHED; s = session_get (ct->c_s_index, ct->c_thread_index); if (s->app_wrk_index == APP_INVALID_INDEX) ct_set_invalid_app_wrk (ct, 0 /* is_client */); } if (!(ct_seg->flags & CT_SEGMENT_F_CLIENT_DETACHED) || !(ct_seg->flags & CT_SEGMENT_F_SERVER_DETACHED)) goto done; /* * Remove segment context because both client and server detached */ pool_put_index (seg_ctx->segments, ct->ct_seg_index); /* * No more segment indices left, remove the segments context */ if (!pool_elts (seg_ctx->segments)) { u64 table_handle = seg_ctx->client_wrk << 16 | seg_ctx->server_wrk; table_handle = (u64) seg_ctx->sm_index << 32 | table_handle; hash_unset (cm->app_segs_ctxs_table, table_handle); pool_free (seg_ctx->segments); pool_put_index (cm->app_seg_ctxs, ct->seg_ctx_index); } /* * Segment to be removed so notify both apps */ app_wrk = app_worker_get_if_valid (ct->client_wrk); /* Determine if client app still needs notification, i.e., if it is * still attached. If client detached and this is the last ct session * on this segment, then its connects segment manager should also be * detached, so do not send notification */ if (app_wrk) { segment_manager_t *csm; csm = app_worker_get_connect_segment_manager (app_wrk); if (!segment_manager_app_detached (csm)) app_worker_del_segment_notify (app_wrk, ct->segment_handle); } if (!segment_manager_app_detached (sm)) { app_wrk = app_worker_get (ct->server_wrk); app_worker_del_segment_notify (app_wrk, ct->segment_handle); } segment_manager_lock_and_del_segment (sm, seg_index); /* Cleanup segment manager if needed. If server detaches there's a chance * the client's sessions will hold up segment removal */ if (segment_manager_app_detached (sm) && !segment_manager_has_fifos (sm)) segment_manager_free_safe (sm); done: clib_rwlock_writer_unlock (&cm->app_segs_lock); } int ct_session_connect_notify (session_t *ss, session_error_t err) { u32 ss_index, opaque, thread_index; ct_connection_t *sct, *cct; app_worker_t *client_wrk; session_t *cs; ss_index = ss->session_index; thread_index = ss->thread_index; sct = (ct_connection_t *) session_get_transport (ss); client_wrk = app_worker_get (sct->client_wrk); opaque = sct->client_opaque; cct = ct_connection_get (sct->peer_index, thread_index); /* Client closed while waiting for reply from server */ if (PREDICT_FALSE (!cct)) { session_transport_closing_notify (&sct->connection); session_transport_delete_notify (&sct->connection); ct_connection_free (sct); return 0; } session_half_open_delete_notify (&cct->connection); cct->flags &= ~CT_CONN_F_HALF_OPEN; if (PREDICT_FALSE (err)) goto connect_error; /* * Alloc client session */ cs = session_alloc (thread_index); ss = session_get (ss_index, thread_index); cs->session_type = ss->session_type; cs->listener_handle = SESSION_INVALID_HANDLE; cs->session_state = SESSION_STATE_CONNECTING; cs->app_wrk_index = client_wrk->wrk_index; cs->connection_index = cct->c_c_index; cct->c_s_index = cs->session_index; /* This will allocate fifos for the session. They won't be used for * exchanging data but they will be used to close the connection if * the segment manager/worker is freed */ if ((err = app_worker_init_connected (client_wrk, cs))) { session_free (cs); session_close (ss); err = SESSION_E_ALLOC; goto connect_error; } cs->session_state = SESSION_STATE_CONNECTING; if (app_worker_connect_notify (client_wrk, cs, 0, opaque)) { segment_manager_dealloc_fifos (cs->rx_fifo, cs->tx_fifo); session_free (cs); session_close (ss); goto cleanup_client; } cs = session_get (cct->c_s_index, cct->c_thread_index); cs->session_state = SESSION_STATE_READY; return 0; connect_error: app_worker_connect_notify (client_wrk, 0, err, cct->client_opaque); cleanup_client: sct->peer_index = ~0; if (cct->client_rx_fifo) ct_session_dealloc_fifos (cct, cct->client_rx_fifo, cct->client_tx_fifo); ct_connection_free (cct); return -1; } static inline ct_segment_t * ct_lookup_free_segment (ct_main_t *cm, segment_manager_t *sm, u32 seg_ctx_index) { uword free_bytes, max_free_bytes; ct_segment_t *ct_seg, *res = 0; ct_segments_ctx_t *seg_ctx; fifo_segment_t *fs; u32 max_fifos; seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, seg_ctx_index); max_free_bytes = seg_ctx->fifo_pair_bytes; pool_foreach (ct_seg, seg_ctx->segments) { /* Client or server has detached so segment cannot be used */ fs = segment_manager_get_segment (sm, ct_seg->segment_index); free_bytes = fifo_segment_available_bytes (fs); max_fifos = fifo_segment_size (fs) / seg_ctx->fifo_pair_bytes; if (free_bytes > max_free_bytes && fifo_segment_num_fifos (fs) / 2 < max_fifos) { max_free_bytes = free_bytes; res = ct_seg; } } return res; } static ct_segment_t * ct_alloc_segment (ct_main_t *cm, app_worker_t *server_wrk, u64 table_handle, segment_manager_t *sm, u32 client_wrk_index) { u32 seg_ctx_index = ~0, sm_index, pair_bytes; segment_manager_props_t *props; const u32 margin = 16 << 10; ct_segments_ctx_t *seg_ctx; app_worker_t *client_wrk; u64 seg_size, seg_handle; application_t *server; ct_segment_t *ct_seg; uword *spp; int fs_index; server = application_get (server_wrk->app_index); props = application_segment_manager_properties (server); sm_index = segment_manager_index (sm); pair_bytes = props->rx_fifo_size + props->tx_fifo_size + margin; /* * Make sure another thread did not alloc a segment while acquiring the lock */ spp = hash_get (cm->app_segs_ctxs_table, table_handle); if (spp) { seg_ctx_index = *spp; ct_seg = ct_lookup_free_segment (cm, sm, seg_ctx_index); if (ct_seg) return ct_seg; } /* * No segment, try to alloc one and notify the server and the client. * Make sure the segment is not used for other fifos */ seg_size = clib_max (props->segment_size, 128 << 20); fs_index = segment_manager_add_segment2 (sm, seg_size, FIFO_SEGMENT_F_CUSTOM_USE); if (fs_index < 0) return 0; if (seg_ctx_index == ~0) { pool_get_zero (cm->app_seg_ctxs, seg_ctx); seg_ctx_index = seg_ctx - cm->app_seg_ctxs; hash_set (cm->app_segs_ctxs_table, table_handle, seg_ctx_index); seg_ctx->server_wrk = server_wrk->wrk_index; seg_ctx->client_wrk = client_wrk_index; seg_ctx->sm_index = sm_index; seg_ctx->fifo_pair_bytes = pair_bytes; } else { seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, seg_ctx_index); } pool_get_zero (seg_ctx->segments, ct_seg); ct_seg->segment_index = fs_index; ct_seg->server_n_sessions = 0; ct_seg->client_n_sessions = 0; ct_seg->ct_seg_index = ct_seg - seg_ctx->segments; ct_seg->seg_ctx_index = seg_ctx_index; /* New segment, notify the server and client */ seg_handle = segment_manager_make_segment_handle (sm_index, fs_index); if (app_worker_add_segment_notify (server_wrk, seg_handle)) goto error; client_wrk = app_worker_get (client_wrk_index); if (app_worker_add_segment_notify (client_wrk, seg_handle)) { app_worker_del_segment_notify (server_wrk, seg_handle); goto error; } return ct_seg; error: segment_manager_lock_and_del_segment (sm, fs_index); pool_put_index (seg_ctx->segments, ct_seg->seg_ctx_index); return 0; } static int ct_init_accepted_session (app_worker_t *server_wrk, ct_connection_t *ct, session_t *ls, session_t *ll) { segment_manager_props_t *props; u64 seg_handle, table_handle; u32 sm_index, fs_index = ~0; ct_segments_ctx_t *seg_ctx; ct_main_t *cm = &ct_main; application_t *server; segment_manager_t *sm; ct_segment_t *ct_seg; fifo_segment_t *fs; uword *spp; int rv; sm = app_worker_get_listen_segment_manager (server_wrk, ll); sm_index = segment_manager_index (sm); server = application_get (server_wrk->app_index); props = application_segment_manager_properties (server); table_handle = ct->client_wrk << 16 | server_wrk->wrk_index; table_handle = (u64) sm_index << 32 | table_handle; /* * Check if we already have a segment that can hold the fifos */ clib_rwlock_reader_lock (&cm->app_segs_lock); spp = hash_get (cm->app_segs_ctxs_table, table_handle); if (spp) { ct_seg = ct_lookup_free_segment (cm, sm, *spp); if (ct_seg) { ct->seg_ctx_index = ct_seg->seg_ctx_index; ct->ct_seg_index = ct_seg->ct_seg_index; fs_index = ct_seg->segment_index; ct_seg->flags &= ~(CT_SEGMENT_F_SERVER_DETACHED | CT_SEGMENT_F_CLIENT_DETACHED); __atomic_add_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED); __atomic_add_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED); } } clib_rwlock_reader_unlock (&cm->app_segs_lock); /* * If not, grab exclusive lock and allocate segment */ if (fs_index == ~0) { clib_rwlock_writer_lock (&cm->app_segs_lock); ct_seg = ct_alloc_segment (cm, server_wrk, table_handle, sm, ct->client_wrk); if (!ct_seg) { clib_rwlock_writer_unlock (&cm->app_segs_lock); return -1; } ct->seg_ctx_index = ct_seg->seg_ctx_index; ct->ct_seg_index = ct_seg->ct_seg_index; ct_seg->server_n_sessions += 1; ct_seg->client_n_sessions += 1; fs_index = ct_seg->segment_index; clib_rwlock_writer_unlock (&cm->app_segs_lock); } /* * Allocate and initialize the fifos */ fs = segment_manager_get_segment_w_lock (sm, fs_index); rv = segment_manager_try_alloc_fifos ( fs, ls->thread_index, props->rx_fifo_size, props->tx_fifo_size, &ls->rx_fifo, &ls->tx_fifo); if (rv) { segment_manager_segment_reader_unlock (sm); clib_rwlock_reader_lock (&cm->app_segs_lock); seg_ctx = pool_elt_at_index (cm->app_seg_ctxs, ct->seg_ctx_index); ct_seg = pool_elt_at_index (seg_ctx->segments, ct->ct_seg_index); __atomic_sub_fetch (&ct_seg->server_n_sessions, 1, __ATOMIC_RELAXED); __atomic_sub_fetch (&ct_seg->client_n_sessions, 1, __ATOMIC_RELAXED); clib_rwlock_reader_unlock (&cm->app_segs_lock); return rv; } ls->rx_fifo->shr->master_session_index = ls->session_index; ls->tx_fifo->shr->master_session_index = ls->session_index; ls->rx_fifo->master_thread_index = ls->thread_index; ls->tx_fifo->master_thread_index = ls->thread_index; ls->rx_fifo->segment_manager = sm_index; ls->tx_fifo->segment_manager = sm_index; ls->rx_fifo->segment_index = fs_index; ls->tx_fifo->segment_index = fs_index; seg_handle = segment_manager_segment_handle (sm, fs); segment_manager_segment_reader_unlock (sm); ct->segment_handle = seg_handle; return 0; } static void ct_accept_one (u32 thread_index, u32 ho_index) { ct_connection_t *sct, *cct, *ho; transport_connection_t *ll_ct; app_worker_t *server_wrk; u32 cct_index, ll_index; session_t *ss, *ll; /* * Alloc client ct and initialize from ho */ cct = ct_connection_alloc (thread_index); cct_index = cct->c_c_index; ho = ct_connection_get (ho_index, 0); /* Unlikely but half-open session and transport could have been freed */ if (PREDICT_FALSE (!ho)) { ct_connection_free (cct); return; } clib_memcpy (cct, ho, sizeof (*ho)); cct->c_c_index = cct_index; cct->c_thread_index = thread_index; cct->flags |= CT_CONN_F_HALF_OPEN; /* Notify session layer that half-open is on a different thread * and mark ho connection index reusable. Avoids another rpc */ session_half_open_migrate_notify (&cct->connection); session_half_open_migrated_notify (&cct->connection); ct_half_open_add_reusable (ho_index); /* * Alloc and init server transport */ ll_index = cct->peer_index; ll = listen_session_get (ll_index); sct = ct_connection_alloc (thread_index); /* Transport not necessarily ct but it might, so grab after sct alloc */ ll_ct = listen_session_get_transport (ll); /* Make sure cct is valid after sct alloc */ cct = ct_connection_get (cct_index, thread_index); sct->c_rmt_port = 0; sct->c_lcl_port = ll_ct->lcl_port; sct->c_is_ip4 = cct->c_is_ip4; clib_memcpy (&sct->c_lcl_ip, &cct->c_rmt_ip, sizeof (cct->c_rmt_ip)); sct->client_wrk = cct->client_wrk; sct->c_proto = TRANSPORT_PROTO_NONE; sct->client_opaque = cct->client_opaque; sct->actual_tp = cct->actual_tp; sct->peer_index = cct->c_c_index; cct->peer_index = sct->c_c_index; /* * Accept server session. Client session is created only after * server confirms accept. */ ss = session_alloc (thread_index); ll = listen_session_get (ll_index); ss->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE, sct->c_is_ip4); ss->connection_index = sct->c_c_index; ss->listener_handle = listen_session_get_handle (ll); ss->session_state = SESSION_STATE_CREATED; server_wrk = application_listener_select_worker (ll); ss->app_wrk_index = server_wrk->wrk_index; sct->c_s_index = ss->session_index; sct->server_wrk = ss->app_wrk_index; if (ct_init_accepted_session (server_wrk, sct, ss, ll)) { ct_session_connect_notify (ss, SESSION_E_ALLOC); ct_connection_free (sct); session_free (ss); return; } cct->server_wrk = sct->server_wrk; cct->seg_ctx_index = sct->seg_ctx_index; cct->ct_seg_index = sct->ct_seg_index; cct->client_rx_fifo = ss->tx_fifo; cct->client_tx_fifo = ss->rx_fifo; cct->client_rx_fifo->refcnt++; cct->client_tx_fifo->refcnt++; cct->segment_handle = sct->segment_handle; ss->session_state = SESSION_STATE_ACCEPTING; if (app_worker_accept_notify (server_wrk, ss)) { ct_session_connect_notify (ss, SESSION_E_REFUSED); ct_session_dealloc_fifos (sct, ss->rx_fifo, ss->tx_fifo); ct_connection_free (sct); session_free (ss); } } static void ct_accept_rpc_wrk_handler (void *rpc_args) { u32 thread_index, ho_index, n_connects, i, n_pending; const u32 max_connects = 32; ct_worker_t *wrk; thread_index = pointer_to_uword (rpc_args); wrk = ct_worker_get (thread_index); /* Sub without lock as main enqueues with worker barrier */ n_pending = clib_fifo_elts (wrk->pending_connects); n_connects = clib_min (n_pending, max_connects); for (i = 0; i < n_connects; i++) { clib_fifo_sub1 (wrk->pending_connects, ho_index); ct_accept_one (thread_index, ho_index); } if (n_pending == n_connects) wrk->have_connects = 0; else session_send_rpc_evt_to_thread_force ( thread_index, ct_accept_rpc_wrk_handler, uword_to_pointer (thread_index, void *)); } static int ct_connect (app_worker_t * client_wrk, session_t * ll, session_endpoint_cfg_t * sep) { u32 thread_index, ho_index; ct_main_t *cm = &ct_main; ct_connection_t *ho; ct_worker_t *wrk; /* Simple round-robin policy for spreading sessions over workers. We skip * thread index 0, i.e., offset the index by 1, when we have workers as it * is the one dedicated to main thread. Note that n_workers does not include * main thread */ cm->n_sessions += 1; thread_index = cm->n_workers ? (cm->n_sessions % cm->n_workers) + 1 : 0; /* * Alloc and init client half-open transport */ ho = ct_half_open_alloc (); ho_index = ho->c_c_index; ho->c_rmt_port = sep->port; ho->c_lcl_port = 0; ho->c_is_ip4 = sep->is_ip4; ho->client_opaque = sep->opaque; ho->client_wrk = client_wrk->wrk_index; ho->peer_index = ll->session_index; ho->c_proto = TRANSPORT_PROTO_NONE; ho->c_flags |= TRANSPORT_CONNECTION_F_NO_LOOKUP; clib_memcpy (&ho->c_rmt_ip, &sep->ip, sizeof (sep->ip)); ho->flags |= CT_CONN_F_CLIENT; ho->c_s_index = ~0; ho->actual_tp = sep->original_tp; /* * Accept connection on thread selected above. Connected reply comes * after server accepts the connection. */ wrk = ct_worker_get (thread_index); /* Worker barrier held, add without additional lock */ clib_fifo_add1 (wrk->pending_connects, ho_index); if (!wrk->have_connects) { wrk->have_connects = 1; session_send_rpc_evt_to_thread_force ( thread_index, ct_accept_rpc_wrk_handler, uword_to_pointer (thread_index, void *)); } return ho_index; } static u32 ct_start_listen (u32 app_listener_index, transport_endpoint_t * tep) { session_endpoint_cfg_t *sep; ct_connection_t *ct; sep = (session_endpoint_cfg_t *) tep; ct = ct_connection_alloc (0); ct->server_wrk = sep->app_wrk_index; ct->c_is_ip4 = sep->is_ip4; clib_memcpy (&ct->c_lcl_ip, &sep->ip, sizeof (sep->ip)); ct->c_lcl_port = sep->port; ct->c_s_index = app_listener_index; ct->actual_tp = sep->transport_proto; return ct->c_c_index; } static u32 ct_stop_listen (u32 ct_index) { ct_connection_t *ct; ct = ct_connection_get (ct_index, 0); ct_connection_free (ct); return 0; } static transport_connection_t * ct_listener_get (u32 ct_index) { return (transport_connection_t *) ct_connection_get (ct_index, 0); } static transport_connection_t * ct_half_open_get (u32 ct_index) { return (transport_connection_t *) ct_connection_get (ct_index, 0); } static void ct_session_cleanup (u32 conn_index, u32 thread_index) { ct_connection_t *ct, *peer_ct; ct = ct_connection_get (conn_index, thread_index); if (!ct) return; peer_ct = ct_connection_get (ct->peer_index, thread_index); if (peer_ct) peer_ct->peer_index = ~0; ct_connection_free (ct); } static void ct_cleanup_ho (u32 ho_index) { ct_connection_free (ct_connection_get (ho_index, 0)); } static int ct_session_connect (transport_endpoint_cfg_t * tep) { session_endpoint_cfg_t *sep_ext; session_endpoint_t _sep, *sep = &_sep; app_worker_t *app_wrk; session_handle_t lh; application_t *app; app_listener_t *al; u32 table_index; session_t *ll; u8 fib_proto; sep_ext = (session_endpoint_cfg_t *) tep; _sep = *(session_endpoint_t *) tep; app_wrk = app_worker_get (sep_ext->app_wrk_index); app = application_get (app_wrk->app_index); sep->transport_proto = sep_ext->original_tp; table_index = application_local_session_table (app); lh = session_lookup_local_endpoint (table_index, sep); if (lh == SESSION_DROP_HANDLE) return SESSION_E_FILTERED; if (lh == SESSION_INVALID_HANDLE) goto global_scope; ll = listen_session_get_from_handle (lh); al = app_listener_get_w_session (ll); /* * 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 (al->app_index == app->app_index) goto global_scope; return ct_connect (app_wrk, ll, sep_ext); /* * 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 SESSION_E_NOROUTE; if (!application_has_global_scope (app)) return SESSION_E_SCOPE; fib_proto = session_endpoint_fib_proto (sep); table_index = session_lookup_get_index_for_fib (fib_proto, sep->fib_index); ll = session_lookup_listener_wildcard (table_index, sep); /* Avoid connecting app to own listener */ if (ll && ll->app_index != app->app_index) return ct_connect (app_wrk, ll, sep_ext); /* Failed to connect but no error */ return SESSION_E_LOCAL_CONNECT; } static void ct_session_postponed_cleanup (ct_connection_t *ct) { app_worker_t *app_wrk; session_t *s; s = session_get (ct->c_s_index, ct->c_thread_index); app_wrk = app_worker_get_if_valid (s->app_wrk_index); if (ct->flags & CT_CONN_F_CLIENT) { if (app_wrk) app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_TRANSPORT); /* Normal free for client session as the fifos are allocated through * the connects segment manager in a segment that's not shared with * the server */ ct_session_dealloc_fifos (ct, ct->client_rx_fifo, ct->client_tx_fifo); session_free_w_fifos (s); } else { /* Manual session and fifo segment cleanup to avoid implicit * segment manager cleanups and notifications */ app_wrk = app_worker_get_if_valid (s->app_wrk_index); if (app_wrk) { app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_TRANSPORT); app_worker_cleanup_notify (app_wrk, s, SESSION_CLEANUP_SESSION); } ct_session_dealloc_fifos (ct, s->rx_fifo, s->tx_fifo); session_free (s); } ct_connection_free (ct); } static void ct_handle_cleanups (void *args) { uword thread_index = pointer_to_uword (args); const u32 max_cleanups = 100; ct_cleanup_req_t *req; ct_connection_t *ct; u32 n_to_handle = 0; ct_worker_t *wrk; session_t *s; wrk = ct_worker_get (thread_index); wrk->have_cleanups = 0; n_to_handle = clib_fifo_elts (wrk->pending_cleanups); n_to_handle = clib_min (n_to_handle, max_cleanups); while (n_to_handle) { clib_fifo_sub2 (wrk->pending_cleanups, req); ct = ct_connection_get (req->ct_index, thread_index); s = session_get (ct->c_s_index, ct->c_thread_index); if (!svm_fifo_has_event (s->tx_fifo)) ct_session_postponed_cleanup (ct); else clib_fifo_add1 (wrk->pending_cleanups, *req); n_to_handle -= 1; } if (clib_fifo_elts (wrk->pending_cleanups)) { wrk->have_cleanups = 1; session_send_rpc_evt_to_thread_force ( thread_index, ct_handle_cleanups, uword_to_pointer (thread_index, void *)); } } static void ct_program_cleanup (ct_connection_t *ct) { ct_cleanup_req_t *req; uword thread_index; ct_worker_t *wrk; thread_index = ct->c_thread_index; wrk = ct_worker_get (ct->c_thread_index); clib_fifo_add2 (wrk->pending_cleanups, req); req->ct_index = ct->c_c_index; if (wrk->have_cleanups) return; wrk->have_cleanups = 1; session_send_rpc_evt_to_thread_force ( thread_index, ct_handle_cleanups, uword_to_pointer (thread_index, void *)); } static inline int ct_close_is_reset (ct_connection_t *ct, session_t *s) { if (ct->flags & CT_CONN_F_CLIENT) return (svm_fifo_max_dequeue (ct->client_rx_fifo) > 0); else return (svm_fifo_max_dequeue (s->rx_fifo) > 0); } static void ct_session_close (u32 ct_index, u32 thread_index) { ct_connection_t *ct, *peer_ct; session_t *s; ct = ct_connection_get (ct_index, thread_index); s = session_get (ct->c_s_index, ct->c_thread_index); peer_ct = ct_connection_get (ct->peer_index, thread_index); if (peer_ct) { peer_ct->peer_index = ~0; /* Make sure session was allocated */ if (peer_ct->flags & CT_CONN_F_HALF_OPEN) { ct_session_connect_notify (s, SESSION_E_REFUSED); } else if (peer_ct->c_s_index != ~0) { if (ct_close_is_reset (ct, s)) session_transport_reset_notify (&peer_ct->connection); else session_transport_closing_notify (&peer_ct->connection); } else { /* should not happen */ clib_warning ("ct peer without session"); ct_connection_free (peer_ct); } } /* Do not send closed notify to make sure pending tx events are * still delivered and program cleanup */ ct_program_cleanup (ct); } static transport_connection_t * ct_session_get (u32 ct_index, u32 thread_index) { return (transport_connection_t *) ct_connection_get (ct_index, thread_index); } static u8 * format_ct_connection_id (u8 * s, va_list * args) { ct_connection_t *ct = va_arg (*args, ct_connection_t *); if (!ct) return s; if (ct->c_is_ip4) { s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index, ct->c_s_index, format_transport_proto_short, ct->actual_tp, format_ip4_address, &ct->c_lcl_ip4, clib_net_to_host_u16 (ct->c_lcl_port), format_ip4_address, &ct->c_rmt_ip4, clib_net_to_host_u16 (ct->c_rmt_port)); } else { s = format (s, "[%d:%d][CT:%U] %U:%d->%U:%d", ct->c_thread_index, ct->c_s_index, format_transport_proto_short, ct->actual_tp, format_ip6_address, &ct->c_lcl_ip6, clib_net_to_host_u16 (ct->c_lcl_port), format_ip6_address, &ct->c_rmt_ip6, clib_net_to_host_u16 (ct->c_rmt_port)); } return s; } static int ct_custom_tx (void *session, transport_send_params_t * sp) { session_t *s = (session_t *) session; if (session_has_transport (s)) return 0; /* If event enqueued towards peer, remove from scheduler and remove * session tx flag, i.e., accept new tx events. Unset fifo flag now to * avoid missing events if peer did not clear fifo flag yet, which is * interpreted as successful notification and session is descheduled. */ svm_fifo_unset_event (s->tx_fifo); if (!ct_session_tx (s)) sp->flags = TRANSPORT_SND_F_DESCHED; /* The scheduler uses packet count as a means of upper bounding the amount * of work done per dispatch. So make it look like we have sent something */ return 1; } static int ct_app_rx_evt (transport_connection_t * tc) { ct_connection_t *ct = (ct_connection_t *) tc, *peer_ct; session_t *ps; peer_ct = ct_connection_get (ct->peer_index, tc->thread_index); if (!peer_ct) return -1; ps = session_get (peer_ct->c_s_index, peer_ct->c_thread_index); return session_dequeue_notify (ps); } static u8 * format_ct_listener (u8 * s, va_list * args) { u32 tc_index = va_arg (*args, u32); u32 __clib_unused thread_index = va_arg (*args, u32); u32 __clib_unused verbose = va_arg (*args, u32); ct_connection_t *ct = ct_connection_get (tc_index, 0); s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct); if (verbose) s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "LISTEN"); return s; } static u8 * format_ct_half_open (u8 *s, va_list *args) { u32 ho_index = va_arg (*args, u32); u32 verbose = va_arg (*args, u32); ct_connection_t *ct = ct_connection_get (ho_index, 0); s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct); if (verbose) s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "HALF-OPEN"); return s; } static u8 * format_ct_connection (u8 * s, va_list * args) { ct_connection_t *ct = va_arg (*args, ct_connection_t *); u32 verbose = va_arg (*args, u32); if (!ct) return s; s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_ct_connection_id, ct); if (verbose) { s = format (s, "%-" SESSION_CLI_STATE_LEN "s", "ESTABLISHED"); if (verbose > 1) { s = format (s, "\n"); } } return s; } static u8 * format_ct_session (u8 * s, va_list * args) { u32 ct_index = va_arg (*args, u32); u32 thread_index = va_arg (*args, u32); u32 verbose = va_arg (*args, u32); ct_connection_t *ct; ct = ct_connection_get (ct_index, thread_index); if (!ct) { s = format (s, "empty\n"); return s; } s = format (s, "%U", format_ct_connection, ct, verbose); return s; } clib_error_t * ct_enable_disable (vlib_main_t * vm, u8 is_en) { vlib_thread_main_t *vtm = &vlib_thread_main; ct_main_t *cm = &ct_main; cm->n_workers = vlib_num_workers (); vec_validate (cm->wrk, vtm->n_vlib_mains); clib_spinlock_init (&cm->ho_reuseable_lock); clib_rwlock_init (&cm->app_segs_lock); return 0; } /* *INDENT-OFF* */ static const transport_proto_vft_t cut_thru_proto = { .enable = ct_enable_disable, .start_listen = ct_start_listen, .stop_listen = ct_stop_listen, .get_connection = ct_session_get, .get_listener = ct_listener_get, .get_half_open = ct_half_open_get, .cleanup = ct_session_cleanup, .cleanup_ho = ct_cleanup_ho, .connect = ct_session_connect, .close = ct_session_close, .custom_tx = ct_custom_tx, .app_rx_evt = ct_app_rx_evt, .format_listener = format_ct_listener, .format_half_open = format_ct_half_open, .format_connection = format_ct_session, .transport_options = { .name = "ct", .short_name = "C", .tx_type = TRANSPORT_TX_INTERNAL, .service_type = TRANSPORT_SERVICE_VC, }, }; /* *INDENT-ON* */ int ct_session_tx (session_t * s) { ct_connection_t *ct, *peer_ct; session_t *peer_s; ct = (ct_connection_t *) session_get_transport (s); peer_ct = ct_connection_get (ct->peer_index, ct->c_thread_index); if (!peer_ct) return 0; peer_s = session_get (peer_ct->c_s_index, peer_ct->c_thread_index); if (peer_s->session_state >= SESSION_STATE_TRANSPORT_CLOSING) return 0; return session_enqueue_notify (peer_s); } static clib_error_t * ct_transport_init (vlib_main_t * vm) { transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto, FIB_PROTOCOL_IP4, ~0); transport_register_protocol (TRANSPORT_PROTO_NONE, &cut_thru_proto, FIB_PROTOCOL_IP6, ~0); return 0; } VLIB_INIT_FUNCTION (ct_transport_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */