| /* |
| * 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> |
| #include <vnet/tcp/tcp.h> |
| #include <vnet/session/session_debug.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); |
| */ |
| void |
| stream_session_table_add_for_tc (transport_connection_t * tc, u64 value) |
| { |
| session_manager_main_t *smm = &session_manager_main; |
| session_kv4_t kv4; |
| session_kv6_t kv6; |
| |
| switch (tc->proto) |
| { |
| 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 (tc, value); |
| } |
| |
| static void |
| stream_session_half_open_table_add (session_type_t 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); |
| } |
| } |
| |
| int |
| stream_session_table_del_for_tc (transport_connection_t * tc) |
| { |
| session_manager_main_t *smm = &session_manager_main; |
| session_kv4_t kv4; |
| session_kv6_t kv6; |
| switch (tc->proto) |
| { |
| 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 (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 (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; |
| 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 (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 = &session_manager_main; |
| 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[proto].get_half_open (kv6.value & 0xFFFFFFFF); |
| |
| return 0; |
| } |
| |
| int |
| stream_session_create_i (segment_manager_t * sm, transport_connection_t * tc, |
| stream_session_t ** ret_s) |
| { |
| session_manager_main_t *smm = &session_manager_main; |
| svm_fifo_t *server_rx_fifo = 0, *server_tx_fifo = 0; |
| u32 fifo_segment_index; |
| u32 pool_index; |
| stream_session_t *s; |
| u64 value; |
| u32 thread_index = tc->thread_index; |
| int rv; |
| |
| if ((rv = segment_manager_alloc_session_fifos (sm, &server_rx_fifo, |
| &server_tx_fifo, |
| &fifo_segment_index))) |
| return rv; |
| |
| /* Create the session */ |
| pool_get_aligned (smm->sessions[thread_index], s, CLIB_CACHE_LINE_BYTES); |
| memset (s, 0, sizeof (*s)); |
| |
| /* Initialize backpointers */ |
| pool_index = s - smm->sessions[thread_index]; |
| server_rx_fifo->master_session_index = pool_index; |
| server_rx_fifo->master_thread_index = thread_index; |
| |
| server_tx_fifo->master_session_index = pool_index; |
| server_tx_fifo->master_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 = tc->proto; |
| s->session_state = SESSION_STATE_CONNECTING; |
| s->svm_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 (tc, value); |
| |
| *ret_s = s; |
| |
| return 0; |
| } |
| |
| /** Enqueue buffer chain tail */ |
| always_inline int |
| session_enqueue_chain_tail (stream_session_t * s, vlib_buffer_t * b, |
| u32 offset, u8 is_in_order) |
| { |
| vlib_buffer_t *chain_b; |
| u32 chain_bi = b->next_buffer; |
| vlib_main_t *vm = vlib_get_main (); |
| u8 *data, len; |
| u16 written = 0; |
| int rv = 0; |
| |
| do |
| { |
| chain_b = vlib_get_buffer (vm, chain_bi); |
| data = vlib_buffer_get_current (chain_b); |
| len = chain_b->current_length; |
| if (is_in_order) |
| { |
| rv = svm_fifo_enqueue_nowait (s->server_rx_fifo, len, data); |
| if (rv < len) |
| { |
| return (rv > 0) ? (written + rv) : written; |
| } |
| written += rv; |
| } |
| else |
| { |
| rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset, len, |
| data); |
| if (rv) |
| return -1; |
| offset += len; |
| } |
| } |
| while ((chain_bi = (chain_b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| ? chain_b->next_buffer : 0)); |
| |
| if (is_in_order) |
| return written; |
| |
| 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 b Buffer to be enqueued |
| * @param offset Offset at which to start enqueueing if out-of-order |
| * @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. |
| * @param is_in_order Flag to indicate if data is in order |
| * @return Number of bytes enqueued or a negative value if enqueueing failed. |
| */ |
| int |
| stream_session_enqueue_data (transport_connection_t * tc, vlib_buffer_t * b, |
| u32 offset, u8 queue_event, u8 is_in_order) |
| { |
| stream_session_t *s; |
| int enqueued = 0, rv; |
| |
| s = stream_session_get (tc->s_index, tc->thread_index); |
| |
| if (is_in_order) |
| { |
| enqueued = |
| svm_fifo_enqueue_nowait (s->server_rx_fifo, b->current_length, |
| vlib_buffer_get_current (b)); |
| if (PREDICT_FALSE |
| ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && enqueued > 0)) |
| { |
| rv = session_enqueue_chain_tail (s, b, 0, 1); |
| if (rv <= 0) |
| return enqueued; |
| enqueued += rv; |
| } |
| } |
| else |
| { |
| rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset, |
| b->current_length, |
| vlib_buffer_get_current (b)); |
| if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && !rv)) |
| rv = session_enqueue_chain_tail (s, b, offset + b->current_length, 0); |
| if (rv) |
| return -1; |
| } |
| |
| 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]); |
| } |
| } |
| |
| if (is_in_order) |
| return enqueued; |
| |
| return 0; |
| } |
| |
| /** 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, 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, 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); |
| |
| /* Built-in server? Hand event to the callback... */ |
| if (app->cb_fns.builtin_server_rx_callback) |
| return app->cb_fns.builtin_server_rx_callback (s); |
| |
| /* If no event, send one */ |
| if (svm_fifo_set_event (s->server_rx_fifo)) |
| { |
| /* Fabricate event */ |
| evt.fifo = s->server_rx_fifo; |
| evt.event_type = FIFO_EVENT_APP_RX; |
| evt.event_id = serial_number++; |
| |
| /* 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 |
| { |
| clib_warning ("fifo full"); |
| return -1; |
| } |
| } |
| |
| /* *INDENT-OFF* */ |
| SESSION_EVT_DBG(SESSION_EVT_ENQ, s, ({ |
| ed->data[0] = evt.event_id; |
| ed->data[1] = svm_fifo_max_dequeue (s->server_rx_fifo); |
| })); |
| /* *INDENT-ON* */ |
| |
| 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; |
| } |
| |
| /** |
| * Init fifo tail and head pointers |
| * |
| * Useful if transport uses absolute offsets for tracking ooo segments. |
| */ |
| void |
| stream_session_init_fifos_pointers (transport_connection_t * tc, |
| u32 rx_pointer, u32 tx_pointer) |
| { |
| stream_session_t *s; |
| s = stream_session_get (tc->s_index, tc->thread_index); |
| svm_fifo_init_pointers (s->server_rx_fifo, rx_pointer); |
| svm_fifo_init_pointers (s->server_tx_fifo, tx_pointer); |
| } |
| |
| 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 handle; |
| u32 api_context = 0; |
| |
| handle = stream_session_half_open_lookup (smm, &tc->lcl_ip, &tc->rmt_ip, |
| tc->lcl_port, tc->rmt_port, |
| tc->proto); |
| if (handle == HALF_OPEN_LOOKUP_INVALID_VALUE) |
| { |
| clib_warning ("This can't be good!"); |
| return; |
| } |
| |
| /* Get the app's index from the handle we stored when opening connection */ |
| app = application_get (handle >> 32); |
| api_context = tc->s_index; |
| |
| if (!is_fail) |
| { |
| segment_manager_t *sm; |
| sm = application_get_connect_segment_manager (app); |
| |
| /* Create new session (svm segments are allocated if needed) */ |
| if (stream_session_create_i (sm, tc, &new_s)) |
| return; |
| |
| new_s->app_index = app->index; |
| } |
| |
| /* Notify client */ |
| app->cb_fns.session_connected_callback (app->index, api_context, 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 (); |
| |
| /* Delete from the main lookup table. */ |
| stream_session_table_del (smm, s); |
| |
| /* Cleanup fifo segments */ |
| segment_manager_dealloc_fifos (s->svm_segment_index, s->server_rx_fifo, |
| s->server_tx_fifo); |
| |
| 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; |
| |
| /* App might've been removed already */ |
| s = stream_session_get_if_valid (tc->s_index, tc->thread_index); |
| if (!s) |
| { |
| 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) |
| { |
| application_t *server; |
| stream_session_t *s, *listener; |
| segment_manager_t *sm; |
| |
| int rv; |
| |
| /* Find the server */ |
| listener = listen_session_get (sst, listener_index); |
| server = application_get (listener->app_index); |
| |
| sm = application_get_listen_segment_manager (server, listener); |
| if ((rv = stream_session_create_i (sm, tc, &s))) |
| return rv; |
| |
| s->app_index = server->index; |
| s->listener_index = listener_index; |
| |
| /* Shoulder-tap the server */ |
| if (notify) |
| { |
| server->cb_fns.session_accept_callback (s); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Ask transport to open connection to remote transport endpoint. |
| * |
| * Stores handle for matching request with reply since the call can be |
| * asynchronous. For instance, for TCP the 3-way handshake must complete |
| * before reply comes. Session is only created once connection is established. |
| * |
| * @param app_index Index of the application requesting the connect |
| * @param st Session type requested. |
| * @param tep Remote transport endpoint |
| * @param res Resulting transport connection . |
| */ |
| int |
| stream_session_open (u32 app_index, session_type_t st, |
| transport_endpoint_t * tep, |
| transport_connection_t ** res) |
| { |
| transport_connection_t *tc; |
| int rv; |
| u64 handle; |
| |
| rv = tp_vfts[st].open (&tep->ip, tep->port); |
| if (rv < 0) |
| { |
| clib_warning ("Transport failed to open connection."); |
| return VNET_API_ERROR_SESSION_CONNECT_FAIL; |
| } |
| |
| tc = tp_vfts[st].get_half_open ((u32) rv); |
| |
| /* Save app and tc index. The latter is needed to help establish the |
| * connection while the former is needed when the connect notify comes |
| * and we have to notify the external app */ |
| handle = (((u64) app_index) << 32) | (u64) tc->c_index; |
| |
| /* Add to the half-open lookup table */ |
| stream_session_half_open_table_add (st, tc, handle); |
| |
| *res = tc; |
| |
| return 0; |
| } |
| |
| /** |
| * Ask transport to listen on local transport endpoint. |
| * |
| * @param s Session for which listen will be called. Note that unlike |
| * established sessions, listen sessions are not associated to a |
| * thread. |
| * @param tep Local endpoint to be listened on. |
| */ |
| int |
| stream_session_listen (stream_session_t * s, transport_endpoint_t * tep) |
| { |
| transport_connection_t *tc; |
| u32 tci; |
| |
| /* Transport bind/listen */ |
| tci = tp_vfts[s->session_type].bind (s->session_index, &tep->ip, tep->port); |
| |
| if (tci == (u32) ~ 0) |
| return -1; |
| |
| /* Attach transport to session */ |
| s->connection_index = tci; |
| tc = tp_vfts[s->session_type].get_listener (tci); |
| |
| /* Weird but handle it ... */ |
| if (tc == 0) |
| return -1; |
| |
| /* Add to the main lookup table */ |
| stream_session_table_add_for_tc (tc, s->session_index); |
| |
| return 0; |
| } |
| |
| /** |
| * Ask transport to stop listening on local transport endpoint. |
| * |
| * @param s Session to stop listening on. It must be in state LISTENING. |
| */ |
| int |
| stream_session_stop_listen (stream_session_t * s) |
| { |
| transport_connection_t *tc; |
| |
| if (s->session_state != SESSION_STATE_LISTENING) |
| { |
| clib_warning ("not a listening session"); |
| return -1; |
| } |
| |
| tc = tp_vfts[s->session_type].get_listener (s->connection_index); |
| if (!tc) |
| { |
| clib_warning ("no transport"); |
| return VNET_API_ERROR_ADDRESS_NOT_IN_USE; |
| } |
| |
| stream_session_table_del_for_tc (tc); |
| tp_vfts[s->session_type].unbind (s->connection_index); |
| return 0; |
| } |
| |
| void |
| session_send_session_evt_to_thread (u64 session_handle, |
| fifo_event_type_t evt_type, |
| u32 thread_index) |
| { |
| static u16 serial_number = 0; |
| session_fifo_event_t evt; |
| unix_shared_memory_queue_t *q; |
| |
| /* Fabricate event */ |
| evt.session_handle = session_handle; |
| evt.event_type = evt_type; |
| evt.event_id = serial_number++; |
| |
| q = session_manager_get_vpp_event_queue (thread_index); |
| |
| /* Based on request block (or not) for lack of space */ |
| if (PREDICT_TRUE (q->cursize < q->maxsize)) |
| unix_shared_memory_queue_add (q, (u8 *) & evt, |
| 0 /* do wait for mutex */ ); |
| else |
| { |
| clib_warning ("queue full"); |
| return; |
| } |
| } |
| |
| /** |
| * 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. |
| * |
| * Should be called from the session's thread. |
| */ |
| void |
| stream_session_disconnect (stream_session_t * s) |
| { |
| s->session_state = SESSION_STATE_CLOSED; |
| tp_vfts[s->session_type].close (s->connection_index, s->thread_index); |
| } |
| |
| /** |
| * Cleanup transport and session state. |
| * |
| * Notify transport of the cleanup, wait for a delete notify to actually |
| * remove the session state. |
| */ |
| void |
| stream_session_cleanup (stream_session_t * s) |
| { |
| session_manager_main_t *smm = &session_manager_main; |
| int rv; |
| |
| s->session_state = SESSION_STATE_CLOSED; |
| |
| /* Delete from the main lookup table to avoid more enqueues */ |
| rv = stream_session_table_del (smm, s); |
| if (rv) |
| clib_warning ("hash delete error, rv %d", rv); |
| |
| tp_vfts[s->session_type].cleanup (s->connection_index, s->thread_index); |
| } |
| |
| 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_tx_fns[type] = |
| (vft->tx_fifo_offset) ? session_tx_fifo_peek_and_snd : |
| session_tx_fifo_dequeue_and_snd; |
| } |
| |
| transport_proto_vft_t * |
| session_get_transport_vft (u8 type) |
| { |
| if (type >= vec_len (tp_vfts)) |
| return 0; |
| return &tp_vfts[type]; |
| } |
| |
| /** |
| * Allocate vpp event queue (once) per worker thread |
| */ |
| void |
| session_vpp_event_queue_allocate (session_manager_main_t * smm, |
| u32 thread_index) |
| { |
| api_main_t *am = &api_main; |
| void *oldheap; |
| u32 event_queue_length = 2048; |
| |
| 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); |
| |
| if (smm->configured_event_queue_length) |
| event_queue_length = smm->configured_event_queue_length; |
| |
| smm->vpp_event_queues[thread_index] = |
| unix_shared_memory_queue_init |
| (event_queue_length, |
| sizeof (session_fifo_event_t), 0 /* consumer pid */ , |
| 0 /* (do not) send signal when queue non-empty */ ); |
| |
| svm_pop_heap (oldheap); |
| } |
| } |
| |
| static clib_error_t * |
| session_manager_main_enable (vlib_main_t * vm) |
| { |
| session_manager_main_t *smm = &session_manager_main; |
| vlib_thread_main_t *vtm = vlib_get_thread_main (); |
| u32 num_threads; |
| int i; |
| |
| num_threads = 1 /* main thread */ + vtm->n_threads; |
| |
| if (num_threads < 1) |
| return clib_error_return (0, "n_thread_stacks not set"); |
| |
| /* $$$ config parameters */ |
| svm_fifo_segment_init (0x200000000ULL /* first segment base VA */ , |
| 20 /* timeout in seconds */ ); |
| |
| /* configure per-thread ** vectors */ |
| vec_validate (smm->sessions, num_threads - 1); |
| vec_validate (smm->session_indices_to_enqueue_by_thread, num_threads - 1); |
| vec_validate (smm->tx_buffers, num_threads - 1); |
| vec_validate (smm->pending_event_vector, num_threads - 1); |
| vec_validate (smm->free_event_vector, num_threads - 1); |
| vec_validate (smm->current_enqueue_epoch, num_threads - 1); |
| vec_validate (smm->vpp_event_queues, num_threads - 1); |
| |
| for (i = 0; i < num_threads; i++) |
| { |
| vec_validate (smm->free_event_vector[i], 0); |
| _vec_len (smm->free_event_vector[i]) = 0; |
| vec_validate (smm->pending_event_vector[i], 0); |
| _vec_len (smm->pending_event_vector[i]) = 0; |
| } |
| |
| #if SESSION_DBG |
| vec_validate (smm->last_event_poll_by_thread, num_threads - 1); |
| #endif |
| |
| /* Allocate vpp event queues */ |
| for (i = 0; i < vec_len (smm->vpp_event_queues); i++) |
| session_vpp_event_queue_allocate (smm, i); |
| |
| /* $$$$ preallocate hack config parameter */ |
| for (i = 0; i < 200000; i++) |
| { |
| stream_session_t *ss; |
| pool_get_aligned (smm->sessions[0], ss, CLIB_CACHE_LINE_BYTES); |
| memset (ss, 0, sizeof (*ss)); |
| } |
| |
| for (i = 0; i < 200000; i++) |
| pool_put_index (smm->sessions[0], i); |
| |
| clib_bihash_init_16_8 (&smm->v4_session_hash, "v4 session table", |
| 200000 /* $$$$ config parameter nbuckets */ , |
| (64 << 20) /*$$$ 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 */ ); |
| |
| smm->is_enabled = 1; |
| |
| /* Enable TCP transport */ |
| vnet_tcp_enable_disable (vm, 1); |
| |
| return 0; |
| } |
| |
| void |
| session_node_enable_disable (u8 is_en) |
| { |
| u8 state = is_en ? VLIB_NODE_STATE_POLLING : VLIB_NODE_STATE_DISABLED; |
| /* *INDENT-OFF* */ |
| foreach_vlib_main (({ |
| vlib_node_set_state (this_vlib_main, session_queue_node.index, |
| state); |
| })); |
| /* *INDENT-ON* */ |
| } |
| |
| clib_error_t * |
| vnet_session_enable_disable (vlib_main_t * vm, u8 is_en) |
| { |
| if (is_en) |
| { |
| if (session_manager_main.is_enabled) |
| return 0; |
| |
| session_node_enable_disable (is_en); |
| |
| return session_manager_main_enable (vm); |
| } |
| else |
| { |
| session_manager_main.is_enabled = 0; |
| session_node_enable_disable (is_en); |
| } |
| |
| return 0; |
| } |
| |
| clib_error_t * |
| session_manager_main_init (vlib_main_t * vm) |
| { |
| session_manager_main_t *smm = &session_manager_main; |
| |
| smm->vlib_main = vm; |
| smm->vnet_main = vnet_get_main (); |
| smm->is_enabled = 0; |
| |
| return 0; |
| } |
| |
| VLIB_INIT_FUNCTION (session_manager_main_init) |
| static clib_error_t *session_config_fn (vlib_main_t * vm, |
| unformat_input_t * input) |
| { |
| session_manager_main_t *smm = &session_manager_main; |
| u32 nitems; |
| |
| while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) |
| { |
| if (unformat (input, "event-queue-length %d", &nitems)) |
| { |
| if (nitems >= 2048) |
| smm->configured_event_queue_length = nitems; |
| else |
| clib_warning ("event queue length %d too small, ignored", nitems); |
| } |
| else |
| return clib_error_return (0, "unknown input `%U'", |
| format_unformat_error, input); |
| } |
| return 0; |
| } |
| |
| VLIB_CONFIG_FUNCTION (session_config_fn, "session"); |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |