| /* |
| * Copyright (c) 2016-2019 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. |
| */ |
| |
| /** |
| * @file |
| * @brief TCP host stack utilities |
| */ |
| |
| #include <vnet/tcp/tcp.h> |
| #include <vnet/tcp/tcp_inlines.h> |
| #include <vnet/session/session.h> |
| #include <vnet/fib/fib.h> |
| #include <vnet/dpo/load_balance.h> |
| #include <math.h> |
| |
| tcp_main_t tcp_main; |
| |
| typedef struct |
| { |
| fib_protocol_t nh_proto; |
| vnet_link_t link_type; |
| ip46_address_t ip; |
| u32 sw_if_index; |
| u8 is_add; |
| } tcp_add_del_adj_args_t; |
| |
| static void |
| tcp_add_del_adj_cb (tcp_add_del_adj_args_t * args) |
| { |
| u32 ai; |
| if (args->is_add) |
| { |
| adj_nbr_add_or_lock (args->nh_proto, args->link_type, &args->ip, |
| args->sw_if_index); |
| } |
| else |
| { |
| ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &args->ip, |
| args->sw_if_index); |
| if (ai != ADJ_INDEX_INVALID) |
| adj_unlock (ai); |
| } |
| } |
| |
| static void |
| tcp_add_del_adjacency (tcp_connection_t * tc, u8 is_add) |
| { |
| tcp_add_del_adj_args_t args = { |
| .nh_proto = FIB_PROTOCOL_IP6, |
| .link_type = VNET_LINK_IP6, |
| .ip = tc->c_rmt_ip, |
| .sw_if_index = tc->sw_if_index, |
| .is_add = is_add |
| }; |
| vlib_rpc_call_main_thread (tcp_add_del_adj_cb, (u8 *) & args, |
| sizeof (args)); |
| } |
| |
| static void |
| tcp_cc_init (tcp_connection_t * tc) |
| { |
| tc->cc_algo->init (tc); |
| } |
| |
| static void |
| tcp_cc_cleanup (tcp_connection_t * tc) |
| { |
| if (tc->cc_algo->cleanup) |
| tc->cc_algo->cleanup (tc); |
| } |
| |
| void |
| tcp_cc_algo_register (tcp_cc_algorithm_type_e type, |
| const tcp_cc_algorithm_t * vft) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| vec_validate (tm->cc_algos, type); |
| |
| tm->cc_algos[type] = *vft; |
| hash_set_mem (tm->cc_algo_by_name, vft->name, type); |
| } |
| |
| tcp_cc_algorithm_t * |
| tcp_cc_algo_get (tcp_cc_algorithm_type_e type) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| return &tm->cc_algos[type]; |
| } |
| |
| tcp_cc_algorithm_type_e |
| tcp_cc_algo_new_type (const tcp_cc_algorithm_t * vft) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_cc_algo_register (++tm->cc_last_type, vft); |
| return tm->cc_last_type; |
| } |
| |
| static u32 |
| tcp_connection_bind (u32 session_index, transport_endpoint_t * lcl) |
| { |
| tcp_main_t *tm = &tcp_main; |
| tcp_connection_t *listener; |
| void *iface_ip; |
| |
| pool_get (tm->listener_pool, listener); |
| clib_memset (listener, 0, sizeof (*listener)); |
| |
| listener->c_c_index = listener - tm->listener_pool; |
| listener->c_lcl_port = lcl->port; |
| |
| /* If we are provided a sw_if_index, bind using one of its ips */ |
| if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX) |
| { |
| if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index, |
| lcl->is_ip4))) |
| ip_set (&lcl->ip, iface_ip, lcl->is_ip4); |
| } |
| ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4); |
| listener->c_is_ip4 = lcl->is_ip4; |
| listener->c_proto = TRANSPORT_PROTO_TCP; |
| listener->c_s_index = session_index; |
| listener->c_fib_index = lcl->fib_index; |
| listener->state = TCP_STATE_LISTEN; |
| listener->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo); |
| |
| tcp_connection_timers_init (listener); |
| |
| TCP_EVT (TCP_EVT_BIND, listener); |
| |
| return listener->c_c_index; |
| } |
| |
| static u32 |
| tcp_session_bind (u32 session_index, transport_endpoint_t * tep) |
| { |
| return tcp_connection_bind (session_index, tep); |
| } |
| |
| static void |
| tcp_connection_unbind (u32 listener_index) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc; |
| |
| tc = pool_elt_at_index (tm->listener_pool, listener_index); |
| |
| TCP_EVT (TCP_EVT_UNBIND, tc); |
| |
| /* Poison the entry */ |
| if (CLIB_DEBUG > 0) |
| clib_memset (tc, 0xFA, sizeof (*tc)); |
| |
| pool_put_index (tm->listener_pool, listener_index); |
| } |
| |
| static u32 |
| tcp_session_unbind (u32 listener_index) |
| { |
| tcp_connection_unbind (listener_index); |
| return 0; |
| } |
| |
| static transport_connection_t * |
| tcp_session_get_listener (u32 listener_index) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc; |
| tc = pool_elt_at_index (tm->listener_pool, listener_index); |
| return &tc->connection; |
| } |
| |
| /** |
| * Cleanup half-open connection |
| * |
| */ |
| static void |
| tcp_half_open_connection_free (tcp_connection_t * tc) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| clib_spinlock_lock_if_init (&tm->half_open_lock); |
| if (CLIB_DEBUG) |
| clib_memset (tc, 0xFA, sizeof (*tc)); |
| pool_put (tm->half_open_connections, tc); |
| clib_spinlock_unlock_if_init (&tm->half_open_lock); |
| } |
| |
| /** |
| * Try to cleanup half-open connection |
| * |
| * If called from a thread that doesn't own tc, the call won't have any |
| * effect. |
| * |
| * @param tc - connection to be cleaned up |
| * @return non-zero if cleanup failed. |
| */ |
| int |
| tcp_half_open_connection_cleanup (tcp_connection_t * tc) |
| { |
| tcp_worker_ctx_t *wrk; |
| |
| /* Make sure this is the owning thread */ |
| if (tc->c_thread_index != vlib_get_thread_index ()) |
| return 1; |
| |
| session_half_open_delete_notify (TRANSPORT_PROTO_TCP, tc->c_s_ho_handle); |
| wrk = tcp_get_worker (tc->c_thread_index); |
| tcp_timer_reset (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN); |
| tcp_half_open_connection_free (tc); |
| return 0; |
| } |
| |
| static tcp_connection_t * |
| tcp_half_open_connection_new (void) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc = 0; |
| ASSERT (vlib_get_thread_index () == 0); |
| pool_get (tm->half_open_connections, tc); |
| clib_memset (tc, 0, sizeof (*tc)); |
| tc->c_c_index = tc - tm->half_open_connections; |
| return tc; |
| } |
| |
| /** |
| * Cleans up connection state. |
| * |
| * No notifications. |
| */ |
| void |
| tcp_connection_cleanup (tcp_connection_t * tc) |
| { |
| TCP_EVT (TCP_EVT_DELETE, tc); |
| |
| /* Cleanup local endpoint if this was an active connect */ |
| if (!(tc->cfg_flags & TCP_CFG_F_NO_ENDPOINT)) |
| transport_endpoint_cleanup (TRANSPORT_PROTO_TCP, &tc->c_lcl_ip, |
| tc->c_lcl_port); |
| |
| /* Check if connection is not yet fully established */ |
| if (tc->state == TCP_STATE_SYN_SENT) |
| { |
| /* Try to remove the half-open connection. If this is not the owning |
| * thread, tc won't be removed. Retransmit or establish timers will |
| * eventually expire and call again cleanup on the right thread. */ |
| if (tcp_half_open_connection_cleanup (tc)) |
| tc->flags |= TCP_CONN_HALF_OPEN_DONE; |
| } |
| else |
| { |
| /* Make sure all timers are cleared */ |
| tcp_connection_timers_reset (tc); |
| |
| if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6)) |
| tcp_add_del_adjacency (tc, 0); |
| |
| tcp_cc_cleanup (tc); |
| vec_free (tc->snd_sacks); |
| vec_free (tc->snd_sacks_fl); |
| vec_free (tc->rcv_opts.sacks); |
| pool_free (tc->sack_sb.holes); |
| |
| if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| tcp_bt_cleanup (tc); |
| |
| tcp_connection_free (tc); |
| } |
| } |
| |
| /** |
| * Connection removal. |
| * |
| * This should be called only once connection enters CLOSED state. Note |
| * that it notifies the session of the removal event, so if the goal is to |
| * just remove the connection, call tcp_connection_cleanup instead. |
| */ |
| void |
| tcp_connection_del (tcp_connection_t * tc) |
| { |
| session_transport_delete_notify (&tc->connection); |
| tcp_connection_cleanup (tc); |
| } |
| |
| tcp_connection_t * |
| tcp_connection_alloc (u8 thread_index) |
| { |
| tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| tcp_connection_t *tc; |
| |
| pool_get (wrk->connections, tc); |
| clib_memset (tc, 0, sizeof (*tc)); |
| tc->c_c_index = tc - wrk->connections; |
| tc->c_thread_index = thread_index; |
| return tc; |
| } |
| |
| tcp_connection_t * |
| tcp_connection_alloc_w_base (u8 thread_index, tcp_connection_t * base) |
| { |
| tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| tcp_connection_t *tc; |
| |
| pool_get (wrk->connections, tc); |
| clib_memcpy_fast (tc, base, sizeof (*tc)); |
| tc->c_c_index = tc - wrk->connections; |
| tc->c_thread_index = thread_index; |
| return tc; |
| } |
| |
| void |
| tcp_connection_free (tcp_connection_t * tc) |
| { |
| tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| if (CLIB_DEBUG) |
| { |
| clib_memset (tc, 0xFA, sizeof (*tc)); |
| pool_put (wrk->connections, tc); |
| return; |
| } |
| pool_put (wrk->connections, tc); |
| } |
| |
| void |
| tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) |
| { |
| tcp_cleanup_req_t *req; |
| clib_time_type_t now; |
| |
| now = transport_time_now (tc->c_thread_index); |
| clib_fifo_add2 (wrk->pending_cleanups, req); |
| req->connection_index = tc->c_c_index; |
| req->free_time = now + tcp_cfg.cleanup_time; |
| } |
| |
| /** |
| * Begin connection closing procedure. |
| * |
| * If at the end the connection is not in CLOSED state, it is not removed. |
| * Instead, we rely on on TCP to advance through state machine to either |
| * 1) LAST_ACK (passive close) whereby when the last ACK is received |
| * tcp_connection_del is called. This notifies session of the delete and |
| * calls cleanup. |
| * 2) TIME_WAIT (active close) whereby after 2MSL the 2MSL timer triggers |
| * and cleanup is called. |
| * |
| * N.B. Half-close connections are not supported |
| */ |
| void |
| tcp_connection_close (tcp_connection_t * tc) |
| { |
| tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| |
| TCP_EVT (TCP_EVT_CLOSE, tc); |
| |
| /* Send/Program FIN if needed and switch state */ |
| switch (tc->state) |
| { |
| case TCP_STATE_SYN_SENT: |
| /* Try to cleanup. If not on the right thread, mark as half-open done. |
| * Connection will be cleaned up when establish timer pops */ |
| tcp_connection_cleanup (tc); |
| break; |
| case TCP_STATE_SYN_RCVD: |
| tcp_connection_timers_reset (tc); |
| tcp_send_fin (tc); |
| tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1); |
| tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
| tcp_cfg.finwait1_time); |
| break; |
| case TCP_STATE_ESTABLISHED: |
| /* If closing with unread data, reset the connection */ |
| if (transport_max_rx_dequeue (&tc->connection)) |
| { |
| tcp_send_reset (tc); |
| tcp_connection_timers_reset (tc); |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| session_transport_closed_notify (&tc->connection); |
| tcp_program_cleanup (tcp_get_worker (tc->c_thread_index), tc); |
| tcp_worker_stats_inc (wrk, rst_unread, 1); |
| break; |
| } |
| if (!transport_max_tx_dequeue (&tc->connection)) |
| tcp_send_fin (tc); |
| else |
| tc->flags |= TCP_CONN_FINPNDG; |
| tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1); |
| /* Set a timer in case the peer stops responding. Otherwise the |
| * connection will be stuck here forever. */ |
| ASSERT (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID); |
| tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
| tcp_cfg.finwait1_time); |
| break; |
| case TCP_STATE_CLOSE_WAIT: |
| if (!transport_max_tx_dequeue (&tc->connection)) |
| { |
| tcp_send_fin (tc); |
| tcp_connection_timers_reset (tc); |
| tcp_connection_set_state (tc, TCP_STATE_LAST_ACK); |
| tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
| tcp_cfg.lastack_time); |
| } |
| else |
| tc->flags |= TCP_CONN_FINPNDG; |
| break; |
| case TCP_STATE_FIN_WAIT_1: |
| tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
| tcp_cfg.finwait1_time); |
| break; |
| case TCP_STATE_CLOSED: |
| /* Cleanup should've been programmed already */ |
| break; |
| default: |
| TCP_DBG ("state: %u", tc->state); |
| } |
| } |
| |
| static void |
| tcp_session_close (u32 conn_index, u32 thread_index) |
| { |
| tcp_connection_t *tc; |
| tc = tcp_connection_get (conn_index, thread_index); |
| tcp_connection_close (tc); |
| } |
| |
| static void |
| tcp_session_cleanup (u32 conn_index, u32 thread_index) |
| { |
| tcp_connection_t *tc; |
| tc = tcp_connection_get (conn_index, thread_index); |
| if (!tc) |
| return; |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| tcp_connection_cleanup (tc); |
| } |
| |
| static void |
| tcp_session_cleanup_ho (u32 conn_index) |
| { |
| tcp_worker_ctx_t *wrk; |
| tcp_connection_t *tc; |
| |
| tc = tcp_half_open_connection_get (conn_index); |
| wrk = tcp_get_worker (tc->c_thread_index); |
| tcp_timer_reset (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN); |
| tcp_half_open_connection_free (tc); |
| } |
| |
| static void |
| tcp_session_reset (u32 conn_index, u32 thread_index) |
| { |
| tcp_connection_t *tc; |
| tc = tcp_connection_get (conn_index, thread_index); |
| tcp_send_reset (tc); |
| tcp_connection_timers_reset (tc); |
| tcp_cong_recovery_off (tc); |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| session_transport_closed_notify (&tc->connection); |
| tcp_program_cleanup (tcp_get_worker (thread_index), tc); |
| } |
| |
| /** |
| * Initialize all connection timers as invalid |
| */ |
| void |
| tcp_connection_timers_init (tcp_connection_t * tc) |
| { |
| int i; |
| |
| /* Set all to invalid */ |
| for (i = 0; i < TCP_N_TIMERS; i++) |
| { |
| tc->timers[i] = TCP_TIMER_HANDLE_INVALID; |
| } |
| |
| tc->rto = TCP_RTO_INIT; |
| } |
| |
| /** |
| * Stop all connection timers |
| */ |
| void |
| tcp_connection_timers_reset (tcp_connection_t * tc) |
| { |
| tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| int i; |
| |
| for (i = 0; i < TCP_N_TIMERS; i++) |
| tcp_timer_reset (&wrk->timer_wheel, tc, i); |
| } |
| |
| #if 0 |
| typedef struct ip4_tcp_hdr |
| { |
| ip4_header_t ip; |
| tcp_header_t tcp; |
| } ip4_tcp_hdr_t; |
| |
| typedef struct ip6_tcp_hdr |
| { |
| ip6_header_t ip; |
| tcp_header_t tcp; |
| } ip6_tcp_hdr_t; |
| |
| static void |
| tcp_connection_select_lb_bucket (tcp_connection_t * tc, const dpo_id_t * dpo, |
| dpo_id_t * result) |
| { |
| const dpo_id_t *choice; |
| load_balance_t *lb; |
| int hash; |
| |
| lb = load_balance_get (dpo->dpoi_index); |
| if (tc->c_is_ip4) |
| { |
| ip4_tcp_hdr_t hdr; |
| clib_memset (&hdr, 0, sizeof (hdr)); |
| hdr.ip.protocol = IP_PROTOCOL_TCP; |
| hdr.ip.address_pair.src.as_u32 = tc->c_lcl_ip.ip4.as_u32; |
| hdr.ip.address_pair.dst.as_u32 = tc->c_rmt_ip.ip4.as_u32; |
| hdr.tcp.src_port = tc->c_lcl_port; |
| hdr.tcp.dst_port = tc->c_rmt_port; |
| hash = ip4_compute_flow_hash (&hdr.ip, lb->lb_hash_config); |
| } |
| else |
| { |
| ip6_tcp_hdr_t hdr; |
| clib_memset (&hdr, 0, sizeof (hdr)); |
| hdr.ip.protocol = IP_PROTOCOL_TCP; |
| clib_memcpy_fast (&hdr.ip.src_address, &tc->c_lcl_ip.ip6, |
| sizeof (ip6_address_t)); |
| clib_memcpy_fast (&hdr.ip.dst_address, &tc->c_rmt_ip.ip6, |
| sizeof (ip6_address_t)); |
| hdr.tcp.src_port = tc->c_lcl_port; |
| hdr.tcp.dst_port = tc->c_rmt_port; |
| hash = ip6_compute_flow_hash (&hdr.ip, lb->lb_hash_config); |
| } |
| choice = load_balance_get_bucket_i (lb, hash & lb->lb_n_buckets_minus_1); |
| dpo_copy (result, choice); |
| } |
| |
| fib_node_index_t |
| tcp_lookup_rmt_in_fib (tcp_connection_t * tc) |
| { |
| fib_prefix_t prefix; |
| u32 fib_index; |
| |
| clib_memcpy_fast (&prefix.fp_addr, &tc->c_rmt_ip, sizeof (prefix.fp_addr)); |
| prefix.fp_proto = tc->c_is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; |
| prefix.fp_len = tc->c_is_ip4 ? 32 : 128; |
| fib_index = fib_table_find (prefix.fp_proto, tc->c_fib_index); |
| return fib_table_lookup (fib_index, &prefix); |
| } |
| |
| static int |
| tcp_connection_stack_on_fib_entry (tcp_connection_t * tc) |
| { |
| dpo_id_t choice = DPO_INVALID; |
| u32 output_node_index; |
| fib_entry_t *fe; |
| |
| fe = fib_entry_get (tc->c_rmt_fei); |
| if (fe->fe_lb.dpoi_type != DPO_LOAD_BALANCE) |
| return -1; |
| |
| tcp_connection_select_lb_bucket (tc, &fe->fe_lb, &choice); |
| |
| output_node_index = |
| tc->c_is_ip4 ? tcp4_output_node.index : tcp6_output_node.index; |
| dpo_stack_from_node (output_node_index, &tc->c_rmt_dpo, &choice); |
| return 0; |
| } |
| |
| /** Stack tcp connection on peer's fib entry. |
| * |
| * This ultimately populates the dpo the connection will use to send packets. |
| */ |
| static void |
| tcp_connection_fib_attach (tcp_connection_t * tc) |
| { |
| tc->c_rmt_fei = tcp_lookup_rmt_in_fib (tc); |
| |
| ASSERT (tc->c_rmt_fei != FIB_NODE_INDEX_INVALID); |
| |
| tcp_connection_stack_on_fib_entry (tc); |
| } |
| #endif /* 0 */ |
| |
| /** |
| * Generate random iss as per rfc6528 |
| */ |
| static u32 |
| tcp_generate_random_iss (tcp_connection_t * tc) |
| { |
| tcp_main_t *tm = &tcp_main; |
| u64 tmp; |
| |
| if (tc->c_is_ip4) |
| tmp = (u64) tc->c_lcl_ip.ip4.as_u32 << 32 | (u64) tc->c_rmt_ip.ip4.as_u32; |
| else |
| tmp = tc->c_lcl_ip.ip6.as_u64[0] ^ tc->c_lcl_ip.ip6.as_u64[1] |
| ^ tc->c_rmt_ip.ip6.as_u64[0] ^ tc->c_rmt_ip.ip6.as_u64[1]; |
| |
| tmp ^= tm->iss_seed.first | ((u64) tc->c_lcl_port << 16 | tc->c_rmt_port); |
| tmp ^= tm->iss_seed.second; |
| tmp = clib_xxhash (tmp) + clib_cpu_time_now (); |
| return ((tmp >> 32) ^ (tmp & 0xffffffff)); |
| } |
| |
| /** |
| * Initialize max segment size we're able to process. |
| * |
| * The value is constrained by the output interface's MTU and by the size |
| * of the IP and TCP headers (see RFC6691). It is also what we advertise |
| * to our peer. |
| */ |
| static void |
| tcp_init_rcv_mss (tcp_connection_t * tc) |
| { |
| u8 ip_hdr_len; |
| |
| /* Already provided at connection init time */ |
| if (tc->mss) |
| return; |
| |
| ip_hdr_len = tc->c_is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t); |
| tc->mss = tcp_cfg.default_mtu - sizeof (tcp_header_t) - ip_hdr_len; |
| } |
| |
| static void |
| tcp_init_mss (tcp_connection_t * tc) |
| { |
| u16 default_min_mss = 536; |
| |
| tcp_init_rcv_mss (tc); |
| |
| /* TODO consider PMTU discovery */ |
| tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss); |
| |
| if (tc->snd_mss < 45) |
| { |
| /* Assume that at least the min default mss works */ |
| tc->snd_mss = default_min_mss; |
| tc->rcv_opts.mss = default_min_mss; |
| } |
| |
| /* We should have enough space for 40 bytes of options */ |
| ASSERT (tc->snd_mss > 45); |
| |
| /* If we use timestamp option, account for it */ |
| if (tcp_opts_tstamp (&tc->rcv_opts)) |
| tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP; |
| } |
| |
| /** |
| * Initialize connection send variables. |
| */ |
| void |
| tcp_init_snd_vars (tcp_connection_t * tc) |
| { |
| /* |
| * We use the time to randomize iss and for setting up the initial |
| * timestamp. Make sure it's updated otherwise syn and ack in the |
| * handshake may make it look as if time has flown in the opposite |
| * direction for us. |
| */ |
| tcp_set_time_now (tcp_get_worker (vlib_get_thread_index ())); |
| |
| tcp_init_rcv_mss (tc); |
| tc->iss = tcp_generate_random_iss (tc); |
| tc->snd_una = tc->iss; |
| tc->snd_nxt = tc->iss + 1; |
| tc->snd_una_max = tc->snd_nxt; |
| tc->srtt = 0.1 * THZ; /* 100 ms */ |
| |
| if (!tcp_cfg.csum_offload) |
| tc->cfg_flags |= TCP_CFG_F_NO_CSUM_OFFLOAD; |
| } |
| |
| void |
| tcp_enable_pacing (tcp_connection_t * tc) |
| { |
| u32 byte_rate; |
| byte_rate = tc->cwnd / (tc->srtt * TCP_TICK); |
| transport_connection_tx_pacer_init (&tc->connection, byte_rate, tc->cwnd); |
| tc->mrtt_us = (u32) ~ 0; |
| } |
| |
| /** Initialize tcp connection variables |
| * |
| * Should be called after having received a msg from the peer, i.e., a SYN or |
| * a SYNACK, such that connection options have already been exchanged. */ |
| void |
| tcp_connection_init_vars (tcp_connection_t * tc) |
| { |
| tcp_connection_timers_init (tc); |
| tcp_init_mss (tc); |
| scoreboard_init (&tc->sack_sb); |
| if (tc->state == TCP_STATE_SYN_RCVD) |
| tcp_init_snd_vars (tc); |
| |
| tcp_cc_init (tc); |
| |
| if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6)) |
| tcp_add_del_adjacency (tc, 1); |
| |
| /* tcp_connection_fib_attach (tc); */ |
| |
| if (transport_connection_is_tx_paced (&tc->connection) |
| || tcp_cfg.enable_tx_pacing) |
| tcp_enable_pacing (tc); |
| |
| if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| tcp_bt_init (tc); |
| |
| if (!tcp_cfg.allow_tso) |
| tc->cfg_flags |= TCP_CFG_F_NO_TSO; |
| |
| tc->start_ts = tcp_time_now_us (tc->c_thread_index); |
| } |
| |
| static int |
| tcp_alloc_custom_local_endpoint (tcp_main_t * tm, ip46_address_t * lcl_addr, |
| u16 * lcl_port, u8 is_ip4) |
| { |
| int index, port; |
| if (is_ip4) |
| { |
| index = tm->last_v4_addr_rotor++; |
| if (tm->last_v4_addr_rotor >= vec_len (tcp_cfg.ip4_src_addrs)) |
| tm->last_v4_addr_rotor = 0; |
| lcl_addr->ip4.as_u32 = tcp_cfg.ip4_src_addrs[index].as_u32; |
| } |
| else |
| { |
| index = tm->last_v6_addr_rotor++; |
| if (tm->last_v6_addr_rotor >= vec_len (tcp_cfg.ip6_src_addrs)) |
| tm->last_v6_addr_rotor = 0; |
| clib_memcpy_fast (&lcl_addr->ip6, &tcp_cfg.ip6_src_addrs[index], |
| sizeof (ip6_address_t)); |
| } |
| port = transport_alloc_local_port (TRANSPORT_PROTO_TCP, lcl_addr); |
| if (port < 1) |
| return SESSION_E_NOPORT; |
| *lcl_port = port; |
| return 0; |
| } |
| |
| static int |
| tcp_session_open (transport_endpoint_cfg_t * rmt) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_connection_t *tc; |
| ip46_address_t lcl_addr; |
| u16 lcl_port; |
| int rv; |
| |
| /* |
| * Allocate local endpoint |
| */ |
| if ((rmt->is_ip4 && vec_len (tcp_cfg.ip4_src_addrs)) |
| || (!rmt->is_ip4 && vec_len (tcp_cfg.ip6_src_addrs))) |
| rv = tcp_alloc_custom_local_endpoint (tm, &lcl_addr, &lcl_port, |
| rmt->is_ip4); |
| else |
| rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_TCP, |
| rmt, &lcl_addr, &lcl_port); |
| |
| if (rv) |
| { |
| if (rv != SESSION_E_PORTINUSE) |
| return rv; |
| |
| if (session_lookup_connection (rmt->fib_index, &lcl_addr, &rmt->ip, |
| lcl_port, rmt->port, TRANSPORT_PROTO_UDP, |
| rmt->is_ip4)) |
| return SESSION_E_PORTINUSE; |
| |
| /* 5-tuple is available so increase lcl endpoint refcount and proceed |
| * with connection allocation */ |
| transport_share_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr, |
| lcl_port); |
| } |
| |
| /* |
| * Create connection and send SYN |
| */ |
| clib_spinlock_lock_if_init (&tm->half_open_lock); |
| tc = tcp_half_open_connection_new (); |
| ip_copy (&tc->c_rmt_ip, &rmt->ip, rmt->is_ip4); |
| ip_copy (&tc->c_lcl_ip, &lcl_addr, rmt->is_ip4); |
| tc->c_rmt_port = rmt->port; |
| tc->c_lcl_port = clib_host_to_net_u16 (lcl_port); |
| tc->c_is_ip4 = rmt->is_ip4; |
| tc->c_proto = TRANSPORT_PROTO_TCP; |
| tc->c_fib_index = rmt->fib_index; |
| tc->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo); |
| /* The other connection vars will be initialized after SYN ACK */ |
| tcp_connection_timers_init (tc); |
| tc->mss = rmt->mss; |
| |
| TCP_EVT (TCP_EVT_OPEN, tc); |
| tc->state = TCP_STATE_SYN_SENT; |
| tcp_init_snd_vars (tc); |
| tcp_send_syn (tc); |
| clib_spinlock_unlock_if_init (&tm->half_open_lock); |
| |
| return tc->c_c_index; |
| } |
| |
| static u8 * |
| format_tcp_session (u8 * s, va_list * args) |
| { |
| u32 tci = va_arg (*args, u32); |
| u32 thread_index = va_arg (*args, u32); |
| u32 verbose = va_arg (*args, u32); |
| tcp_connection_t *tc; |
| |
| tc = tcp_connection_get (tci, thread_index); |
| if (tc) |
| s = format (s, "%U", format_tcp_connection, tc, verbose); |
| else |
| s = format (s, "empty\n"); |
| return s; |
| } |
| |
| static u8 * |
| format_tcp_listener_session (u8 * s, va_list * args) |
| { |
| u32 tci = va_arg (*args, u32); |
| u32 __clib_unused thread_index = va_arg (*args, u32); |
| u32 verbose = va_arg (*args, u32); |
| tcp_connection_t *tc = tcp_listener_get (tci); |
| s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_tcp_connection_id, tc); |
| if (verbose) |
| s = format (s, "%-" SESSION_CLI_STATE_LEN "U", format_tcp_state, |
| tc->state); |
| return s; |
| } |
| |
| static u8 * |
| format_tcp_half_open_session (u8 * s, va_list * args) |
| { |
| u32 tci = va_arg (*args, u32); |
| u32 __clib_unused thread_index = va_arg (*args, u32); |
| tcp_connection_t *tc = tcp_half_open_connection_get (tci); |
| return format (s, "%U", format_tcp_connection_id, tc); |
| } |
| |
| static transport_connection_t * |
| tcp_session_get_transport (u32 conn_index, u32 thread_index) |
| { |
| tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index); |
| if (PREDICT_FALSE (!tc)) |
| return 0; |
| return &tc->connection; |
| } |
| |
| static transport_connection_t * |
| tcp_half_open_session_get_transport (u32 conn_index) |
| { |
| tcp_connection_t *tc = tcp_half_open_connection_get (conn_index); |
| return &tc->connection; |
| } |
| |
| static u16 |
| tcp_session_cal_goal_size (tcp_connection_t * tc) |
| { |
| u16 goal_size = tc->snd_mss; |
| |
| goal_size = tcp_cfg.max_gso_size - tc->snd_mss % tcp_cfg.max_gso_size; |
| goal_size = clib_min (goal_size, tc->snd_wnd / 2); |
| |
| return goal_size > tc->snd_mss ? goal_size : tc->snd_mss; |
| } |
| |
| always_inline u32 |
| tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space) |
| { |
| if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss)) |
| { |
| return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0; |
| } |
| |
| /* If not snd_wnd constrained and we can't write at least a segment, |
| * don't try at all */ |
| if (PREDICT_FALSE (snd_space < tc->snd_mss)) |
| return snd_space < tc->cwnd ? 0 : snd_space; |
| |
| /* round down to mss multiple */ |
| return snd_space - (snd_space % tc->snd_mss); |
| } |
| |
| /** |
| * Compute tx window session is allowed to fill. |
| * |
| * Takes into account available send space, snd_mss and the congestion |
| * state of the connection. If possible, the value returned is a multiple |
| * of snd_mss. |
| * |
| * @param tc tcp connection |
| * @return number of bytes session is allowed to write |
| */ |
| static inline u32 |
| tcp_snd_space_inline (tcp_connection_t * tc) |
| { |
| int snd_space; |
| |
| if (PREDICT_FALSE (tcp_in_fastrecovery (tc) |
| || tc->state == TCP_STATE_CLOSED)) |
| return 0; |
| |
| snd_space = tcp_available_output_snd_space (tc); |
| |
| /* If we got dupacks or sacked bytes but we're not yet in recovery, try |
| * to force the peer to send enough dupacks to start retransmitting as |
| * per Limited Transmit (RFC3042) |
| */ |
| if (PREDICT_FALSE (tc->rcv_dupacks || tc->sack_sb.sacked_bytes)) |
| { |
| int snt_limited, n_pkts; |
| |
| n_pkts = tcp_opts_sack_permitted (&tc->rcv_opts) |
| ? tc->sack_sb.reorder - 1 : 2; |
| |
| if ((seq_lt (tc->limited_transmit, tc->snd_nxt - n_pkts * tc->snd_mss) |
| || seq_gt (tc->limited_transmit, tc->snd_nxt))) |
| tc->limited_transmit = tc->snd_nxt; |
| |
| ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt)); |
| |
| snt_limited = tc->snd_nxt - tc->limited_transmit; |
| snd_space = clib_max (n_pkts * tc->snd_mss - snt_limited, 0); |
| } |
| return tcp_round_snd_space (tc, snd_space); |
| } |
| |
| u32 |
| tcp_snd_space (tcp_connection_t * tc) |
| { |
| return tcp_snd_space_inline (tc); |
| } |
| |
| static int |
| tcp_session_send_params (transport_connection_t * trans_conn, |
| transport_send_params_t * sp) |
| { |
| tcp_connection_t *tc = (tcp_connection_t *) trans_conn; |
| |
| /* Ensure snd_mss does accurately reflect the amount of data we can push |
| * in a segment. This also makes sure that options are updated according to |
| * the current state of the connection. */ |
| tcp_update_burst_snd_vars (tc); |
| |
| if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_TSO)) |
| sp->snd_mss = tcp_session_cal_goal_size (tc); |
| else |
| sp->snd_mss = tc->snd_mss; |
| |
| sp->snd_space = clib_min (tcp_snd_space_inline (tc), |
| tc->snd_wnd - (tc->snd_nxt - tc->snd_una)); |
| |
| ASSERT (seq_geq (tc->snd_nxt, tc->snd_una)); |
| /* This still works if fast retransmit is on */ |
| sp->tx_offset = tc->snd_nxt - tc->snd_una; |
| |
| sp->flags = sp->snd_space ? 0 : TRANSPORT_SND_F_DESCHED; |
| |
| return 0; |
| } |
| |
| static void |
| tcp_timer_waitclose_handler (tcp_connection_t * tc) |
| { |
| tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| |
| switch (tc->state) |
| { |
| case TCP_STATE_CLOSE_WAIT: |
| tcp_connection_timers_reset (tc); |
| /* App never returned with a close */ |
| if (!(tc->flags & TCP_CONN_FINPNDG)) |
| { |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| session_transport_closed_notify (&tc->connection); |
| tcp_program_cleanup (wrk, tc); |
| tcp_worker_stats_inc (wrk, to_closewait, 1); |
| break; |
| } |
| |
| /* Send FIN either way and switch to LAST_ACK. */ |
| tcp_cong_recovery_off (tc); |
| /* Make sure we don't try to send unsent data */ |
| tc->snd_nxt = tc->snd_una; |
| tcp_send_fin (tc); |
| tcp_connection_set_state (tc, TCP_STATE_LAST_ACK); |
| session_transport_closed_notify (&tc->connection); |
| |
| /* Make sure we don't wait in LAST ACK forever */ |
| tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE, |
| tcp_cfg.lastack_time); |
| tcp_worker_stats_inc (wrk, to_closewait2, 1); |
| |
| /* Don't delete the connection yet */ |
| break; |
| case TCP_STATE_FIN_WAIT_1: |
| tcp_connection_timers_reset (tc); |
| if (tc->flags & TCP_CONN_FINPNDG) |
| { |
| /* If FIN pending, we haven't sent everything, but we did try. |
| * Notify session layer that transport is closed. */ |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| tcp_send_reset (tc); |
| tcp_program_cleanup (wrk, tc); |
| } |
| else |
| { |
| /* We've sent the fin but no progress. Close the connection and |
| * to make sure everything is flushed, setup a cleanup timer */ |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| tcp_program_cleanup (wrk, tc); |
| } |
| session_transport_closed_notify (&tc->connection); |
| tcp_worker_stats_inc (wrk, to_finwait1, 1); |
| break; |
| case TCP_STATE_LAST_ACK: |
| tcp_connection_timers_reset (tc); |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| session_transport_closed_notify (&tc->connection); |
| tcp_program_cleanup (wrk, tc); |
| tcp_worker_stats_inc (wrk, to_lastack, 1); |
| break; |
| case TCP_STATE_CLOSING: |
| tcp_connection_timers_reset (tc); |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| session_transport_closed_notify (&tc->connection); |
| tcp_program_cleanup (wrk, tc); |
| tcp_worker_stats_inc (wrk, to_closing, 1); |
| break; |
| case TCP_STATE_FIN_WAIT_2: |
| tcp_send_reset (tc); |
| tcp_connection_timers_reset (tc); |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| session_transport_closed_notify (&tc->connection); |
| tcp_program_cleanup (wrk, tc); |
| tcp_worker_stats_inc (wrk, to_finwait2, 1); |
| break; |
| case TCP_STATE_TIME_WAIT: |
| tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| tcp_program_cleanup (wrk, tc); |
| break; |
| default: |
| clib_warning ("waitclose in state: %U", format_tcp_state, tc->state); |
| break; |
| } |
| } |
| |
| /* *INDENT-OFF* */ |
| static timer_expiration_handler *timer_expiration_handlers[TCP_N_TIMERS] = |
| { |
| tcp_timer_retransmit_handler, |
| tcp_timer_persist_handler, |
| tcp_timer_waitclose_handler, |
| tcp_timer_retransmit_syn_handler, |
| }; |
| /* *INDENT-ON* */ |
| |
| static void |
| tcp_dispatch_pending_timers (tcp_worker_ctx_t * wrk) |
| { |
| u32 n_timers, connection_index, timer_id, thread_index, timer_handle; |
| tcp_connection_t *tc; |
| int i; |
| |
| if (!(n_timers = clib_fifo_elts (wrk->pending_timers))) |
| return; |
| |
| thread_index = wrk->vm->thread_index; |
| for (i = 0; i < clib_min (n_timers, wrk->max_timers_per_loop); i++) |
| { |
| clib_fifo_sub1 (wrk->pending_timers, timer_handle); |
| connection_index = timer_handle & 0x0FFFFFFF; |
| timer_id = timer_handle >> 28; |
| |
| if (PREDICT_TRUE (timer_id != TCP_TIMER_RETRANSMIT_SYN)) |
| tc = tcp_connection_get (connection_index, thread_index); |
| else |
| tc = tcp_half_open_connection_get (connection_index); |
| |
| if (PREDICT_FALSE (!tc)) |
| continue; |
| |
| /* Skip if the timer is not pending. Probably it was reset while |
| * wating for dispatch */ |
| if (PREDICT_FALSE (!(tc->pending_timers & (1 << timer_id)))) |
| continue; |
| |
| tc->pending_timers &= ~(1 << timer_id); |
| |
| /* Skip timer if it was rearmed while pending dispatch */ |
| if (PREDICT_FALSE (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID)) |
| continue; |
| |
| (*timer_expiration_handlers[timer_id]) (tc); |
| } |
| |
| if (thread_index == 0 && clib_fifo_elts (wrk->pending_timers)) |
| session_queue_run_on_main_thread (wrk->vm); |
| } |
| |
| static void |
| tcp_handle_cleanups (tcp_worker_ctx_t * wrk, clib_time_type_t now) |
| { |
| u32 thread_index = wrk->vm->thread_index; |
| tcp_cleanup_req_t *req; |
| tcp_connection_t *tc; |
| |
| while (clib_fifo_elts (wrk->pending_cleanups)) |
| { |
| req = clib_fifo_head (wrk->pending_cleanups); |
| if (req->free_time > now) |
| break; |
| clib_fifo_sub2 (wrk->pending_cleanups, req); |
| tc = tcp_connection_get (req->connection_index, thread_index); |
| if (PREDICT_FALSE (!tc)) |
| continue; |
| session_transport_delete_notify (&tc->connection); |
| tcp_connection_cleanup (tc); |
| } |
| } |
| |
| static void |
| tcp_update_time (f64 now, u8 thread_index) |
| { |
| tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| |
| tcp_set_time_now (wrk); |
| tcp_handle_cleanups (wrk, now); |
| tw_timer_expire_timers_16t_2w_512sl (&wrk->timer_wheel, now); |
| tcp_dispatch_pending_timers (wrk); |
| } |
| |
| static void |
| tcp_session_flush_data (transport_connection_t * tconn) |
| { |
| tcp_connection_t *tc = (tcp_connection_t *) tconn; |
| if (tc->flags & TCP_CONN_PSH_PENDING) |
| return; |
| tc->flags |= TCP_CONN_PSH_PENDING; |
| tc->psh_seq = tc->snd_una + transport_max_tx_dequeue (tconn) - 1; |
| } |
| |
| /* *INDENT-OFF* */ |
| const static transport_proto_vft_t tcp_proto = { |
| .enable = vnet_tcp_enable_disable, |
| .start_listen = tcp_session_bind, |
| .stop_listen = tcp_session_unbind, |
| .push_header = tcp_session_push_header, |
| .get_connection = tcp_session_get_transport, |
| .get_listener = tcp_session_get_listener, |
| .get_half_open = tcp_half_open_session_get_transport, |
| .connect = tcp_session_open, |
| .close = tcp_session_close, |
| .cleanup = tcp_session_cleanup, |
| .cleanup_ho = tcp_session_cleanup_ho, |
| .reset = tcp_session_reset, |
| .send_params = tcp_session_send_params, |
| .update_time = tcp_update_time, |
| .flush_data = tcp_session_flush_data, |
| .custom_tx = tcp_session_custom_tx, |
| .format_connection = format_tcp_session, |
| .format_listener = format_tcp_listener_session, |
| .format_half_open = format_tcp_half_open_session, |
| .transport_options = { |
| .name = "tcp", |
| .short_name = "T", |
| .tx_type = TRANSPORT_TX_PEEK, |
| .service_type = TRANSPORT_SERVICE_VC, |
| }, |
| }; |
| /* *INDENT-ON* */ |
| |
| void |
| tcp_connection_tx_pacer_update (tcp_connection_t * tc) |
| { |
| if (!transport_connection_is_tx_paced (&tc->connection)) |
| return; |
| |
| f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us); |
| |
| transport_connection_tx_pacer_update (&tc->connection, |
| tcp_cc_get_pacing_rate (tc), |
| srtt * CLIB_US_TIME_FREQ); |
| } |
| |
| void |
| tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window, |
| u32 start_bucket) |
| { |
| f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us); |
| transport_connection_tx_pacer_reset (&tc->connection, |
| tcp_cc_get_pacing_rate (tc), |
| start_bucket, |
| srtt * CLIB_US_TIME_FREQ); |
| } |
| |
| void |
| tcp_reschedule (tcp_connection_t * tc) |
| { |
| if (tcp_in_cong_recovery (tc) || tcp_snd_space_inline (tc)) |
| transport_connection_reschedule (&tc->connection); |
| } |
| |
| static void |
| tcp_expired_timers_dispatch (u32 * expired_timers) |
| { |
| u32 thread_index = vlib_get_thread_index (), n_left, max_per_loop; |
| u32 connection_index, timer_id, n_expired, max_loops; |
| tcp_worker_ctx_t *wrk; |
| tcp_connection_t *tc; |
| int i; |
| |
| wrk = tcp_get_worker (thread_index); |
| n_expired = vec_len (expired_timers); |
| tcp_worker_stats_inc (wrk, timer_expirations, n_expired); |
| n_left = clib_fifo_elts (wrk->pending_timers); |
| |
| /* |
| * Invalidate all timer handles before dispatching. This avoids dangling |
| * index references to timer wheel pool entries that have been freed. |
| */ |
| for (i = 0; i < n_expired; i++) |
| { |
| connection_index = expired_timers[i] & 0x0FFFFFFF; |
| timer_id = expired_timers[i] >> 28; |
| |
| if (timer_id != TCP_TIMER_RETRANSMIT_SYN) |
| tc = tcp_connection_get (connection_index, thread_index); |
| else |
| tc = tcp_half_open_connection_get (connection_index); |
| |
| TCP_EVT (TCP_EVT_TIMER_POP, connection_index, timer_id); |
| |
| tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID; |
| tc->pending_timers |= (1 << timer_id); |
| } |
| |
| clib_fifo_add (wrk->pending_timers, expired_timers, n_expired); |
| |
| max_loops = clib_max (1, 0.5 * TCP_TIMER_TICK * wrk->vm->loops_per_second); |
| max_per_loop = clib_max ((n_left + n_expired) / max_loops, 10); |
| max_per_loop = clib_min (max_per_loop, VLIB_FRAME_SIZE); |
| wrk->max_timers_per_loop = clib_max (n_left ? wrk->max_timers_per_loop : 0, |
| max_per_loop); |
| |
| if (thread_index == 0) |
| session_queue_run_on_main_thread (wrk->vm); |
| } |
| |
| static void |
| tcp_initialize_timer_wheels (tcp_main_t * tm) |
| { |
| vlib_main_t *vm = vlib_get_main (); |
| tw_timer_wheel_16t_2w_512sl_t *tw; |
| /* *INDENT-OFF* */ |
| foreach_vlib_main (({ |
| tw = &tm->wrk_ctx[ii].timer_wheel; |
| tw_timer_wheel_init_16t_2w_512sl (tw, tcp_expired_timers_dispatch, |
| TCP_TIMER_TICK, ~0); |
| tw->last_run_time = vlib_time_now (vm); |
| })); |
| /* *INDENT-ON* */ |
| } |
| |
| static void |
| tcp_initialize_iss_seed (tcp_main_t * tm) |
| { |
| u32 default_seed = random_default_seed (); |
| u64 time_now = clib_cpu_time_now (); |
| |
| tm->iss_seed.first = (u64) random_u32 (&default_seed) << 32; |
| tm->iss_seed.second = random_u64 (&time_now); |
| } |
| |
| static clib_error_t * |
| tcp_main_enable (vlib_main_t * vm) |
| { |
| vlib_thread_main_t *vtm = vlib_get_thread_main (); |
| u32 num_threads, n_workers, prealloc_conn_per_wrk; |
| tcp_connection_t *tc __attribute__ ((unused)); |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| tcp_worker_ctx_t *wrk; |
| clib_error_t *error = 0; |
| int thread; |
| |
| if ((error = vlib_call_init_function (vm, ip_main_init))) |
| return error; |
| if ((error = vlib_call_init_function (vm, ip4_lookup_init))) |
| return error; |
| if ((error = vlib_call_init_function (vm, ip6_lookup_init))) |
| return error; |
| |
| /* |
| * Registrations |
| */ |
| |
| ip4_register_protocol (IP_PROTOCOL_TCP, tcp4_input_node.index); |
| ip6_register_protocol (IP_PROTOCOL_TCP, tcp6_input_node.index); |
| |
| /* |
| * Initialize data structures |
| */ |
| |
| num_threads = 1 /* main thread */ + vtm->n_threads; |
| vec_validate (tm->wrk_ctx, num_threads - 1); |
| n_workers = num_threads == 1 ? 1 : vtm->n_threads; |
| prealloc_conn_per_wrk = tcp_cfg.preallocated_connections / n_workers; |
| |
| wrk = &tm->wrk_ctx[0]; |
| wrk->tco_next_node[0] = vlib_node_get_next (vm, session_queue_node.index, |
| tcp4_output_node.index); |
| wrk->tco_next_node[1] = vlib_node_get_next (vm, session_queue_node.index, |
| tcp6_output_node.index); |
| |
| for (thread = 0; thread < num_threads; thread++) |
| { |
| wrk = &tm->wrk_ctx[thread]; |
| |
| vec_validate (wrk->pending_deq_acked, 255); |
| vec_validate (wrk->pending_disconnects, 255); |
| vec_validate (wrk->pending_resets, 255); |
| vec_reset_length (wrk->pending_deq_acked); |
| vec_reset_length (wrk->pending_disconnects); |
| vec_reset_length (wrk->pending_resets); |
| wrk->vm = vlib_mains[thread]; |
| wrk->max_timers_per_loop = 10; |
| |
| if (thread > 0) |
| { |
| wrk->tco_next_node[0] = tm->wrk_ctx[0].tco_next_node[0]; |
| wrk->tco_next_node[1] = tm->wrk_ctx[0].tco_next_node[1]; |
| } |
| |
| /* |
| * Preallocate connections. Assume that thread 0 won't |
| * use preallocated threads when running multi-core |
| */ |
| if ((thread > 0 || num_threads == 1) && prealloc_conn_per_wrk) |
| pool_init_fixed (wrk->connections, prealloc_conn_per_wrk); |
| } |
| |
| /* |
| * Use a preallocated half-open connection pool? |
| */ |
| if (tcp_cfg.preallocated_half_open_connections) |
| pool_init_fixed (tm->half_open_connections, |
| tcp_cfg.preallocated_half_open_connections); |
| |
| if (num_threads > 1) |
| { |
| clib_spinlock_init (&tm->half_open_lock); |
| } |
| |
| tcp_initialize_timer_wheels (tm); |
| tcp_initialize_iss_seed (tm); |
| |
| tm->bytes_per_buffer = vlib_buffer_get_default_data_size (vm); |
| tm->cc_last_type = TCP_CC_LAST; |
| |
| tm->ipl_next_node[0] = vlib_node_get_next (vm, session_queue_node.index, |
| ip4_lookup_node.index); |
| tm->ipl_next_node[1] = vlib_node_get_next (vm, session_queue_node.index, |
| ip6_lookup_node.index); |
| return error; |
| } |
| |
| clib_error_t * |
| vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en) |
| { |
| if (is_en) |
| { |
| if (tcp_main.is_enabled) |
| return 0; |
| |
| return tcp_main_enable (vm); |
| } |
| else |
| { |
| tcp_main.is_enabled = 0; |
| } |
| |
| return 0; |
| } |
| |
| void |
| tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add) |
| { |
| tcp_main_t *tm = &tcp_main; |
| if (is_ip4) |
| tm->punt_unknown4 = is_add; |
| else |
| tm->punt_unknown6 = is_add; |
| } |
| |
| /** |
| * Initialize default values for tcp parameters |
| */ |
| static void |
| tcp_configuration_init (void) |
| { |
| /* Initial wnd for SYN. Fifos are not allocated at that point so use some |
| * predefined value. For SYN-ACK we still want the scale to be computed in |
| * the same way */ |
| tcp_cfg.max_rx_fifo = 32 << 20; |
| tcp_cfg.min_rx_fifo = 4 << 10; |
| |
| tcp_cfg.default_mtu = 1500; |
| tcp_cfg.initial_cwnd_multiplier = 0; |
| tcp_cfg.enable_tx_pacing = 1; |
| tcp_cfg.allow_tso = 0; |
| tcp_cfg.csum_offload = 1; |
| tcp_cfg.cc_algo = TCP_CC_CUBIC; |
| tcp_cfg.rwnd_min_update_ack = 1; |
| tcp_cfg.max_gso_size = TCP_MAX_GSO_SZ; |
| |
| /* Time constants defined as timer tick (100ms) multiples */ |
| tcp_cfg.delack_time = 1; /* 0.1s */ |
| tcp_cfg.closewait_time = 20; /* 2s */ |
| tcp_cfg.timewait_time = 100; /* 10s */ |
| tcp_cfg.finwait1_time = 600; /* 60s */ |
| tcp_cfg.lastack_time = 300; /* 30s */ |
| tcp_cfg.finwait2_time = 300; /* 30s */ |
| tcp_cfg.closing_time = 300; /* 30s */ |
| tcp_cfg.cleanup_time = 0.1; /* 100ms */ |
| } |
| |
| static clib_error_t * |
| tcp_init (vlib_main_t * vm) |
| { |
| tcp_main_t *tm = vnet_get_tcp_main (); |
| ip_main_t *im = &ip_main; |
| ip_protocol_info_t *pi; |
| |
| /* Session layer, and by implication tcp, are disabled by default */ |
| tm->is_enabled = 0; |
| |
| /* Register with IP for header parsing */ |
| pi = ip_get_protocol_info (im, IP_PROTOCOL_TCP); |
| if (pi == 0) |
| return clib_error_return (0, "TCP protocol info AWOL"); |
| pi->format_header = format_tcp_header; |
| pi->unformat_pg_edit = unformat_pg_tcp_header; |
| |
| /* Register as transport with session layer */ |
| transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto, |
| FIB_PROTOCOL_IP4, tcp4_output_node.index); |
| transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto, |
| FIB_PROTOCOL_IP6, tcp6_output_node.index); |
| |
| tcp_configuration_init (); |
| |
| tm->cc_algo_by_name = hash_create_string (0, sizeof (uword)); |
| |
| return 0; |
| } |
| |
| VLIB_INIT_FUNCTION (tcp_init); |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |