/* * 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/session/session.h> #include <vnet/fib/fib.h> #include <vnet/dpo/load_balance.h> #include <vnet/dpo/receive_dpo.h> #include <vnet/ip-neighbor/ip_neighbor.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_del (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) { /* Make sure this is the owning thread */ if (tc->c_thread_index != vlib_get_thread_index ()) return 1; tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT_SYN); tcp_half_open_connection_del (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); } /** * 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_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 (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); tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time); session_transport_closed_notify (&tc->connection); tcp_worker_stats_inc (tc->c_thread_index, 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 (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 (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.lastack_time); } else tc->flags |= TCP_CONN_FINPNDG; break; case TCP_STATE_FIN_WAIT_1: tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.finwait1_time); break; case TCP_STATE_CLOSED: tcp_connection_timers_reset (tc); /* Delete connection but instead of doing it now wait until next * dispatch cycle to give the session layer a chance to clear * unhandled events */ tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); 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_reset (u32 conn_index, u32 thread_index) { tcp_connection_t *tc; tc = tcp_connection_get (conn_index, thread_index); session_transport_closed_notify (&tc->connection); tcp_send_reset (tc); tcp_connection_timers_reset (tc); tcp_cong_recovery_off (tc); tcp_connection_set_state (tc, TCP_STATE_CLOSED); tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); } /** * 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) { int i; for (i = 0; i < TCP_N_TIMERS; i++) { tcp_timer_reset (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 = 100; /* 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) { clib_warning ("Failed to allocate src port"); return -1; } *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) return -1; /* * 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; } const char *tcp_fsm_states[] = { #define _(sym, str) str, foreach_tcp_fsm_state #undef _ }; u8 * format_tcp_state (u8 * s, va_list * args) { u32 state = va_arg (*args, u32); if (state < TCP_N_STATES) s = format (s, "%s", tcp_fsm_states[state]); else s = format (s, "UNKNOWN (%d (0x%x))", state, state); return s; } const char *tcp_cfg_flags_str[] = { #define _(sym, str) str, foreach_tcp_cfg_flag #undef _ }; static u8 * format_tcp_cfg_flags (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); int i, last = -1; for (i = 0; i < TCP_CFG_N_FLAG_BITS; i++) if (tc->cfg_flags & (1 << i)) last = i; for (i = 0; i < last; i++) { if (tc->cfg_flags & (1 << i)) s = format (s, "%s, ", tcp_cfg_flags_str[i]); } if (last >= 0) s = format (s, "%s", tcp_cfg_flags_str[last]); return s; } const char *tcp_connection_flags_str[] = { #define _(sym, str) str, foreach_tcp_connection_flag #undef _ }; static u8 * format_tcp_connection_flags (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); int i, last = -1; for (i = 0; i < TCP_CONN_N_FLAG_BITS; i++) if (tc->flags & (1 << i)) last = i; for (i = 0; i < last; i++) { if (tc->flags & (1 << i)) s = format (s, "%s, ", tcp_connection_flags_str[i]); } if (last >= 0) s = format (s, "%s", tcp_connection_flags_str[last]); return s; } const char *tcp_conn_timers[] = { #define _(sym, str) str, foreach_tcp_timer #undef _ }; static u8 * format_tcp_timers (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); int i, last = -1; for (i = 0; i < TCP_N_TIMERS; i++) if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID) last = i; for (i = 0; i < last; i++) { if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID) s = format (s, "%s,", tcp_conn_timers[i]); } if (last >= 0) s = format (s, "%s", tcp_conn_timers[i]); return s; } static u8 * format_tcp_congestion_status (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); if (tcp_in_recovery (tc)) s = format (s, "recovery"); else if (tcp_in_fastrecovery (tc)) s = format (s, "fastrecovery"); else s = format (s, "none"); return s; } static i32 tcp_rcv_wnd_available (tcp_connection_t * tc) { return (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las); } static u8 * format_tcp_congestion (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); u32 indent = format_get_indent (s), prr_space = 0; s = format (s, "%U ", format_tcp_congestion_status, tc); s = format (s, "algo %s cwnd %u ssthresh %u bytes_acked %u\n", tc->cc_algo->name, tc->cwnd, tc->ssthresh, tc->bytes_acked); s = format (s, "%Ucc space %u prev_cwnd %u prev_ssthresh %u\n", format_white_space, indent, tcp_available_cc_snd_space (tc), tc->prev_cwnd, tc->prev_ssthresh); s = format (s, "%Usnd_cong %u dupack %u limited_tx %u\n", format_white_space, indent, tc->snd_congestion - tc->iss, tc->rcv_dupacks, tc->limited_transmit - tc->iss); s = format (s, "%Urxt_bytes %u rxt_delivered %u rxt_head %u rxt_ts %u\n", format_white_space, indent, tc->snd_rxt_bytes, tc->rxt_delivered, tc->rxt_head - tc->iss, tcp_time_now_w_thread (tc->c_thread_index) - tc->snd_rxt_ts); if (tcp_in_fastrecovery (tc)) prr_space = tcp_fastrecovery_prr_snd_space (tc); s = format (s, "%Uprr_start %u prr_delivered %u prr space %u\n", format_white_space, indent, tc->prr_start - tc->iss, tc->prr_delivered, prr_space); return s; } static u8 * format_tcp_stats (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); u32 indent = format_get_indent (s); s = format (s, "in segs %lu dsegs %lu bytes %lu dupacks %u\n", tc->segs_in, tc->data_segs_in, tc->bytes_in, tc->dupacks_in); s = format (s, "%Uout segs %lu dsegs %lu bytes %lu dupacks %u\n", format_white_space, indent, tc->segs_out, tc->data_segs_out, tc->bytes_out, tc->dupacks_out); s = format (s, "%Ufr %u tr %u rxt segs %lu bytes %lu duration %.3f\n", format_white_space, indent, tc->fr_occurences, tc->tr_occurences, tc->segs_retrans, tc->bytes_retrans, tcp_time_now_us (tc->c_thread_index) - tc->start_ts); s = format (s, "%Uerr wnd data below %u above %u ack below %u above %u", format_white_space, indent, tc->errors.below_data_wnd, tc->errors.above_data_wnd, tc->errors.below_ack_wnd, tc->errors.above_ack_wnd); return s; } static u8 * format_tcp_vars (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); s = format (s, " index: %u cfg: %U flags: %U timers: %U\n", tc->c_c_index, format_tcp_cfg_flags, tc, format_tcp_connection_flags, tc, format_tcp_timers, tc); s = format (s, " snd_una %u snd_nxt %u snd_una_max %u", tc->snd_una - tc->iss, tc->snd_nxt - tc->iss, tc->snd_una_max - tc->iss); s = format (s, " rcv_nxt %u rcv_las %u\n", tc->rcv_nxt - tc->irs, tc->rcv_las - tc->irs); s = format (s, " snd_wnd %u rcv_wnd %u rcv_wscale %u ", tc->snd_wnd, tc->rcv_wnd, tc->rcv_wscale); s = format (s, "snd_wl1 %u snd_wl2 %u\n", tc->snd_wl1 - tc->irs, tc->snd_wl2 - tc->iss); s = format (s, " flight size %u out space %u rcv_wnd_av %u", tcp_flight_size (tc), tcp_available_output_snd_space (tc), tcp_rcv_wnd_available (tc)); s = format (s, " tsval_recent %u\n", tc->tsval_recent); s = format (s, " tsecr %u tsecr_last_ack %u tsval_recent_age %u", tc->rcv_opts.tsecr, tc->tsecr_last_ack, tcp_time_now () - tc->tsval_recent_age); s = format (s, " snd_mss %u\n", tc->snd_mss); s = format (s, " rto %u rto_boff %u srtt %u us %.3f rttvar %u rtt_ts %.4f", tc->rto, tc->rto_boff, tc->srtt, tc->mrtt_us * 1000, tc->rttvar, tc->rtt_ts); s = format (s, " rtt_seq %u\n", tc->rtt_seq - tc->iss); s = format (s, " next_node %u opaque 0x%x\n", tc->next_node_index, tc->next_node_opaque); s = format (s, " cong: %U", format_tcp_congestion, tc); if (tc->state >= TCP_STATE_ESTABLISHED) { s = format (s, " sboard: %U\n", format_tcp_scoreboard, &tc->sack_sb, tc); s = format (s, " stats: %U\n", format_tcp_stats, tc); } if (vec_len (tc->snd_sacks)) s = format (s, " sacks tx: %U\n", format_tcp_sacks, tc); return s; } u8 * format_tcp_connection_id (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); if (!tc) return s; if (tc->c_is_ip4) { s = format (s, "[%d:%d][%s] %U:%d->%U:%d", tc->c_thread_index, tc->c_s_index, "T", format_ip4_address, &tc->c_lcl_ip4, clib_net_to_host_u16 (tc->c_lcl_port), format_ip4_address, &tc->c_rmt_ip4, clib_net_to_host_u16 (tc->c_rmt_port)); } else { s = format (s, "[%d:%d][%s] %U:%d->%U:%d", tc->c_thread_index, tc->c_s_index, "T", format_ip6_address, &tc->c_lcl_ip6, clib_net_to_host_u16 (tc->c_lcl_port), format_ip6_address, &tc->c_rmt_ip6, clib_net_to_host_u16 (tc->c_rmt_port)); } return s; } u8 * format_tcp_connection (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); u32 verbose = va_arg (*args, u32); if (!tc) return s; s = format (s, "%-50U", format_tcp_connection_id, tc); if (verbose) { s = format (s, "%-15U", format_tcp_state, tc->state); if (verbose > 1) s = format (s, "\n%U", format_tcp_vars, tc); } return s; } 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, "%-50U", format_tcp_connection_id, tc); if (verbose) s = format (s, "%-15U", 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); } u8 * format_tcp_sacks (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); sack_block_t *sacks = tc->snd_sacks; sack_block_t *block; int i, len = 0; len = vec_len (sacks); for (i = 0; i < len - 1; i++) { block = &sacks[i]; s = format (s, " start %u end %u\n", block->start - tc->irs, block->end - tc->irs); } if (len) { block = &sacks[len - 1]; s = format (s, " start %u end %u", block->start - tc->irs, block->end - tc->irs); } return s; } u8 * format_tcp_rcv_sacks (u8 * s, va_list * args) { tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); sack_block_t *sacks = tc->rcv_opts.sacks; sack_block_t *block; int i, len = 0; len = vec_len (sacks); for (i = 0; i < len - 1; i++) { block = &sacks[i]; s = format (s, " start %u end %u\n", block->start - tc->iss, block->end - tc->iss); } if (len) { block = &sacks[len - 1]; s = format (s, " start %u end %u", block->start - tc->iss, block->end - tc->iss); } return s; } static u8 * format_tcp_sack_hole (u8 * s, va_list * args) { sack_scoreboard_hole_t *hole = va_arg (*args, sack_scoreboard_hole_t *); tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); if (tc) s = format (s, " [%u, %u]", hole->start - tc->iss, hole->end - tc->iss); else s = format (s, " [%u, %u]", hole->start, hole->end); return s; } u8 * format_tcp_scoreboard (u8 * s, va_list * args) { sack_scoreboard_t *sb = va_arg (*args, sack_scoreboard_t *); tcp_connection_t *tc = va_arg (*args, tcp_connection_t *); sack_scoreboard_hole_t *hole; u32 indent = format_get_indent (s); s = format (s, "sacked %u last_sacked %u lost %u last_lost %u" " rxt_sacked %u\n", sb->sacked_bytes, sb->last_sacked_bytes, sb->lost_bytes, sb->last_lost_bytes, sb->rxt_sacked); s = format (s, "%Ulast_delivered %u high_sacked %u is_reneging %u\n", format_white_space, indent, sb->last_bytes_delivered, sb->high_sacked - tc->iss, sb->is_reneging); s = format (s, "%Ucur_rxt_hole %u high_rxt %u rescue_rxt %u", format_white_space, indent, sb->cur_rxt_hole, sb->high_rxt - tc->iss, sb->rescue_rxt - tc->iss); hole = scoreboard_first_hole (sb); if (hole) s = format (s, "\n%Uhead %u tail %u %u holes:\n%U", format_white_space, indent, sb->head, sb->tail, pool_elts (sb->holes), format_white_space, indent); while (hole) { s = format (s, "%U", format_tcp_sack_hole, hole, tc); hole = scoreboard_next_hole (sb, hole); } return s; } 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_MAX_GSO_SZ - tc->snd_mss % TCP_MAX_GSO_SZ; goal_size = clib_min (goal_size, tc->snd_wnd / 2); return goal_size > tc->snd_mss ? goal_size : tc->snd_mss; } /** * Compute maximum segment size for session layer. * * Since the result needs to be the actual data length, it first computes * the tcp options to be used in the next burst and subtracts their * length from the connection's snd_mss. */ static u16 tcp_session_send_mss (transport_connection_t * trans_conn) { 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)) return tcp_session_cal_goal_size (tc); return 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 != 0 || tc->sack_sb.sacked_bytes)) { if (tc->limited_transmit != tc->snd_nxt && (seq_lt (tc->limited_transmit, tc->snd_nxt - 2 * 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)); int snt_limited = tc->snd_nxt - tc->limited_transmit; snd_space = clib_max ((int) 2 * 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 u32 tcp_session_send_space (transport_connection_t * trans_conn) { tcp_connection_t *tc = (tcp_connection_t *) trans_conn; return clib_min (tcp_snd_space_inline (tc), tc->snd_wnd - (tc->snd_nxt - tc->snd_una)); } static u32 tcp_session_tx_fifo_offset (transport_connection_t * trans_conn) { tcp_connection_t *tc = (tcp_connection_t *) trans_conn; ASSERT (seq_geq (tc->snd_nxt, tc->snd_una)); /* This still works if fast retransmit is on */ return (tc->snd_nxt - tc->snd_una); } static void tcp_timer_waitclose_handler (tcp_connection_t * tc) { switch (tc->state) { case TCP_STATE_CLOSE_WAIT: tcp_connection_timers_reset (tc); session_transport_closed_notify (&tc->connection); /* App never returned with a close */ if (!(tc->flags & TCP_CONN_FINPNDG)) { tcp_connection_set_state (tc, TCP_STATE_CLOSED); tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); tcp_worker_stats_inc (tc->c_thread_index, 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); /* Make sure we don't wait in LAST ACK forever */ tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.lastack_time); tcp_worker_stats_inc (tc->c_thread_index, to_closewait2, 1); /* Don't delete the connection yet */ break; case TCP_STATE_FIN_WAIT_1: tcp_connection_timers_reset (tc); session_transport_closed_notify (&tc->connection); 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_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); } 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_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); } tcp_worker_stats_inc (tc->c_thread_index, to_finwait1, 1); break; case TCP_STATE_LAST_ACK: tcp_connection_timers_reset (tc); tcp_connection_set_state (tc, TCP_STATE_CLOSED); tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); session_transport_closed_notify (&tc->connection); tcp_worker_stats_inc (tc->c_thread_index, to_lastack, 1); break; case TCP_STATE_CLOSING: tcp_connection_timers_reset (tc); tcp_connection_set_state (tc, TCP_STATE_CLOSED); tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); session_transport_closed_notify (&tc->connection); tcp_worker_stats_inc (tc->c_thread_index, 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_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time); tcp_worker_stats_inc (tc->c_thread_index, to_finwait2, 1); break; default: tcp_connection_del (tc); break; } } /* *INDENT-OFF* */ static timer_expiration_handler *timer_expiration_handlers[TCP_N_TIMERS] = { tcp_timer_retransmit_handler, tcp_timer_delack_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, 32); 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 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); } } /** * Flush ip lookup tx frames populated by timer pops */ static void tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk) { if (wrk->ip_lookup_tx_frames[0]) { vlib_put_frame_to_node (wrk->vm, ip4_lookup_node.index, wrk->ip_lookup_tx_frames[0]); wrk->ip_lookup_tx_frames[0] = 0; } if (wrk->ip_lookup_tx_frames[1]) { vlib_put_frame_to_node (wrk->vm, ip6_lookup_node.index, wrk->ip_lookup_tx_frames[1]); wrk->ip_lookup_tx_frames[1] = 0; } } 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); tw_timer_expire_timers_16t_2w_512sl (&wrk->timer_wheel, now); tcp_dispatch_pending_timers (wrk); tcp_flush_frames_to_output (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, .reset = tcp_session_reset, .send_mss = tcp_session_send_mss, .send_space = tcp_session_send_space, .update_time = tcp_update_time, .tx_fifo_offset = tcp_session_tx_fifo_offset, .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 = { .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); } static void tcp_expired_timers_dispatch (u32 * expired_timers) { u32 thread_index = vlib_get_thread_index (); u32 connection_index, timer_id, n_expired; tcp_worker_ctx_t *wrk; tcp_connection_t *tc; int i; wrk = tcp_get_worker (thread_index); n_expired = vec_len (expired_timers); tcp_workerp_stats_inc (wrk, timer_expirations, n_expired); /* * 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; } clib_fifo_add (wrk->pending_timers, expired_timers, n_expired); } static void tcp_initialize_timer_wheels (tcp_main_t * tm) { 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 (this_vlib_main); })); /* *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; 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]; /* * 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); /* Initialize clocks per tick for TCP timestamp. Used to compute * monotonically increasing timestamps. */ tm->tstamp_ticks_per_clock = vm->clib_time.seconds_per_clock / TCP_TSTAMP_RESOLUTION; 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; 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_NEWRENO; tcp_cfg.rwnd_min_update_ack = 1; /* 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 = 1; /* 0.1s */ } 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_api_reference (); tcp_configuration_init (); tm->cc_algo_by_name = hash_create_string (0, sizeof (uword)); return 0; } VLIB_INIT_FUNCTION (tcp_init); uword unformat_tcp_cc_algo (unformat_input_t * input, va_list * va) { tcp_cc_algorithm_type_e *result = va_arg (*va, tcp_cc_algorithm_type_e *); tcp_main_t *tm = &tcp_main; char *cc_algo_name; u8 found = 0; uword *p; if (unformat (input, "%s", &cc_algo_name) && ((p = hash_get_mem (tm->cc_algo_by_name, cc_algo_name)))) { *result = *p; found = 1; } vec_free (cc_algo_name); return found; } uword unformat_tcp_cc_algo_cfg (unformat_input_t * input, va_list * va) { tcp_main_t *tm = vnet_get_tcp_main (); tcp_cc_algorithm_t *cc_alg; unformat_input_t sub_input; int found = 0; vec_foreach (cc_alg, tm->cc_algos) { if (!unformat (input, cc_alg->name)) continue; if (cc_alg->unformat_cfg && unformat (input, "%U", unformat_vlib_cli_sub_input, &sub_input)) { if (cc_alg->unformat_cfg (&sub_input)) found = 1; } } return found; } static clib_error_t * tcp_config_fn (vlib_main_t * vm, unformat_input_t * input) { u32 cwnd_multiplier, tmp_time; uword memory_size; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "preallocated-connections %d", &tcp_cfg.preallocated_connections)) ; else if (unformat (input, "preallocated-half-open-connections %d", &tcp_cfg.preallocated_half_open_connections)) ; else if (unformat (input, "buffer-fail-fraction %f", &tcp_cfg.buffer_fail_fraction)) ; else if (unformat (input, "max-rx-fifo %U", unformat_memory_size, &memory_size)) { if (memory_size >= 0x100000000) { return clib_error_return (0, "max-rx-fifo %llu (0x%llx) too large", memory_size, memory_size); } tcp_cfg.max_rx_fifo = memory_size; } else if (unformat (input, "min-rx-fifo %U", unformat_memory_size, &memory_size)) { if (memory_size >= 0x100000000) { return clib_error_return (0, "min-rx-fifo %llu (0x%llx) too large", memory_size, memory_size); } tcp_cfg.min_rx_fifo = memory_size; } else if (unformat (input, "mtu %u", &tcp_cfg.default_mtu)) ; else if (unformat (input, "rwnd-min-update-ack %d", &tcp_cfg.rwnd_min_update_ack)) ; else if (unformat (input, "initial-cwnd-multiplier %u", &cwnd_multiplier)) tcp_cfg.initial_cwnd_multiplier = cwnd_multiplier; else if (unformat (input, "no-tx-pacing")) tcp_cfg.enable_tx_pacing = 0; else if (unformat (input, "tso")) tcp_cfg.allow_tso = 1; else if (unformat (input, "no-csum-offload")) tcp_cfg.csum_offload = 0; else if (unformat (input, "cc-algo %U", unformat_tcp_cc_algo, &tcp_cfg.cc_algo)) ; else if (unformat (input, "%U", unformat_tcp_cc_algo_cfg)) ; else if (unformat (input, "closewait-time %u", &tmp_time)) tcp_cfg.closewait_time = tmp_time / TCP_TIMER_TICK; else if (unformat (input, "timewait-time %u", &tmp_time)) tcp_cfg.timewait_time = tmp_time / TCP_TIMER_TICK; else if (unformat (input, "finwait1-time %u", &tmp_time)) tcp_cfg.finwait1_time = tmp_time / TCP_TIMER_TICK; else if (unformat (input, "finwait2-time %u", &tmp_time)) tcp_cfg.finwait2_time = tmp_time / TCP_TIMER_TICK; else if (unformat (input, "lastack-time %u", &tmp_time)) tcp_cfg.lastack_time = tmp_time / TCP_TIMER_TICK; else if (unformat (input, "closing-time %u", &tmp_time)) tcp_cfg.closing_time = tmp_time / TCP_TIMER_TICK; else if (unformat (input, "cleanup-time %u", &tmp_time)) tcp_cfg.cleanup_time = tmp_time / TCP_TIMER_TICK; else return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); } return 0; } VLIB_CONFIG_FUNCTION (tcp_config_fn, "tcp"); /** * \brief Configure an ipv4 source address range * @param vm vlib_main_t pointer * @param start first ipv4 address in the source address range * @param end last ipv4 address in the source address range * @param table_id VRF / table ID, 0 for the default FIB * @return 0 if all OK, else an error indication from api_errno.h */ int tcp_configure_v4_source_address_range (vlib_main_t * vm, ip4_address_t * start, ip4_address_t * end, u32 table_id) { u32 start_host_byte_order, end_host_byte_order; fib_prefix_t prefix; fib_node_index_t fei; u32 fib_index = 0; u32 sw_if_index; int rv; clib_memset (&prefix, 0, sizeof (prefix)); fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id); if (fib_index == ~0) return VNET_API_ERROR_NO_SUCH_FIB; start_host_byte_order = clib_net_to_host_u32 (start->as_u32); end_host_byte_order = clib_net_to_host_u32 (end->as_u32); /* sanity check for reversed args or some such */ if ((end_host_byte_order - start_host_byte_order) > (10 << 10)) return VNET_API_ERROR_INVALID_ARGUMENT; /* Lookup the last address, to identify the interface involved */ prefix.fp_len = 32; prefix.fp_proto = FIB_PROTOCOL_IP4; memcpy (&prefix.fp_addr.ip4, end, sizeof (ip4_address_t)); fei = fib_table_lookup (fib_index, &prefix); /* Couldn't find route to destination. Bail out. */ if (fei == FIB_NODE_INDEX_INVALID) return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB; sw_if_index = fib_entry_get_resolving_interface (fei); /* Configure proxy arp across the range */ rv = ip4_neighbor_proxy_add (fib_index, start, end); if (rv) return rv; rv = ip4_neighbor_proxy_enable (sw_if_index); if (rv) return rv; do { dpo_id_t dpo = DPO_INVALID; vec_add1 (tcp_cfg.ip4_src_addrs, start[0]); /* Add local adjacencies for the range */ receive_dpo_add_or_lock (DPO_PROTO_IP4, ~0 /* sw_if_index */ , NULL, &dpo); prefix.fp_len = 32; prefix.fp_proto = FIB_PROTOCOL_IP4; prefix.fp_addr.ip4.as_u32 = start->as_u32; fib_table_entry_special_dpo_update (fib_index, &prefix, FIB_SOURCE_API, FIB_ENTRY_FLAG_EXCLUSIVE, &dpo); dpo_reset (&dpo); start_host_byte_order++; start->as_u32 = clib_host_to_net_u32 (start_host_byte_order); } while (start_host_byte_order <= end_host_byte_order); return 0; } /** * \brief Configure an ipv6 source address range * @param vm vlib_main_t pointer * @param start first ipv6 address in the source address range * @param end last ipv6 address in the source address range * @param table_id VRF / table ID, 0 for the default FIB * @return 0 if all OK, else an error indication from api_errno.h */ int tcp_configure_v6_source_address_range (vlib_main_t * vm, ip6_address_t * start, ip6_address_t * end, u32 table_id) { fib_prefix_t prefix; u32 fib_index = 0; fib_node_index_t fei; u32 sw_if_index; clib_memset (&prefix, 0, sizeof (prefix)); fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id); if (fib_index == ~0) return VNET_API_ERROR_NO_SUCH_FIB; while (1) { int i; ip6_address_t tmp; dpo_id_t dpo = DPO_INVALID; /* Remember this address */ vec_add1 (tcp_cfg.ip6_src_addrs, start[0]); /* Lookup the prefix, to identify the interface involved */ prefix.fp_len = 128; prefix.fp_proto = FIB_PROTOCOL_IP6; memcpy (&prefix.fp_addr.ip6, start, sizeof (ip6_address_t)); fei = fib_table_lookup (fib_index, &prefix); /* Couldn't find route to destination. Bail out. */ if (fei == FIB_NODE_INDEX_INVALID) return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB; sw_if_index = fib_entry_get_resolving_interface (fei); if (sw_if_index == (u32) ~ 0) return VNET_API_ERROR_NO_MATCHING_INTERFACE; /* Add a proxy neighbor discovery entry for this address */ ip6_neighbor_proxy_add (sw_if_index, start); /* Add a receive adjacency for this address */ receive_dpo_add_or_lock (DPO_PROTO_IP6, ~0 /* sw_if_index */ , NULL, &dpo); fib_table_entry_special_dpo_update (fib_index, &prefix, FIB_SOURCE_API, FIB_ENTRY_FLAG_EXCLUSIVE, &dpo); dpo_reset (&dpo); /* Done with the entire range? */ if (!memcmp (start, end, sizeof (start[0]))) break; /* Increment the address. DGMS. */ tmp = start[0]; for (i = 15; i >= 0; i--) { tmp.as_u8[i] += 1; if (tmp.as_u8[i] != 0) break; } start[0] = tmp; } return 0; } static clib_error_t * tcp_src_address_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd_arg) { ip4_address_t v4start, v4end; ip6_address_t v6start, v6end; u32 table_id = 0; int v4set = 0; int v6set = 0; int rv; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "%U - %U", unformat_ip4_address, &v4start, unformat_ip4_address, &v4end)) v4set = 1; else if (unformat (input, "%U", unformat_ip4_address, &v4start)) { memcpy (&v4end, &v4start, sizeof (v4start)); v4set = 1; } else if (unformat (input, "%U - %U", unformat_ip6_address, &v6start, unformat_ip6_address, &v6end)) v6set = 1; else if (unformat (input, "%U", unformat_ip6_address, &v6start)) { memcpy (&v6end, &v6start, sizeof (v6start)); v6set = 1; } else if (unformat (input, "fib-table %d", &table_id)) ; else break; } if (!v4set && !v6set) return clib_error_return (0, "at least one v4 or v6 address required"); if (v4set) { rv = tcp_configure_v4_source_address_range (vm, &v4start, &v4end, table_id); switch (rv) { case 0: break; case VNET_API_ERROR_NO_SUCH_FIB: return clib_error_return (0, "Invalid table-id %d", table_id); case VNET_API_ERROR_INVALID_ARGUMENT: return clib_error_return (0, "Invalid address range %U - %U", format_ip4_address, &v4start, format_ip4_address, &v4end); default: return clib_error_return (0, "error %d", rv); break; } } if (v6set) { rv = tcp_configure_v6_source_address_range (vm, &v6start, &v6end, table_id); switch (rv) { case 0: break; case VNET_API_ERROR_NO_SUCH_FIB: return clib_error_return (0, "Invalid table-id %d", table_id); default: return clib_error_return (0, "error %d", rv); break; } } return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (tcp_src_address_command, static) = { .path = "tcp src-address", .short_help = "tcp src-address <ip-addr> [- <ip-addr>] add src address range", .function = tcp_src_address_fn, }; /* *INDENT-ON* */ static u8 * tcp_scoreboard_dump_trace (u8 * s, sack_scoreboard_t * sb) { #if TCP_SCOREBOARD_TRACE scoreboard_trace_elt_t *block; int i = 0; if (!sb->trace) return s; s = format (s, "scoreboard trace:"); vec_foreach (block, sb->trace) { s = format (s, "{%u, %u, %u, %u, %u}, ", block->start, block->end, block->ack, block->snd_una_max, block->group); if ((++i % 3) == 0) s = format (s, "\n"); } return s; #else return 0; #endif } static clib_error_t * tcp_show_scoreboard_trace_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd_arg) { transport_connection_t *tconn = 0; tcp_connection_t *tc; u8 *s = 0; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "%U", unformat_transport_connection, &tconn, TRANSPORT_PROTO_TCP)) ; else return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); } if (!TCP_SCOREBOARD_TRACE) { vlib_cli_output (vm, "scoreboard tracing not enabled"); return 0; } tc = tcp_get_connection_from_transport (tconn); s = tcp_scoreboard_dump_trace (s, &tc->sack_sb); vlib_cli_output (vm, "%v", s); return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (tcp_show_scoreboard_trace_command, static) = { .path = "show tcp scoreboard trace", .short_help = "show tcp scoreboard trace <connection>", .function = tcp_show_scoreboard_trace_fn, }; /* *INDENT-ON* */ u8 * tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose) { int i, trace_len; scoreboard_trace_elt_t *trace; u32 next_ack, left, group, has_new_ack = 0; tcp_connection_t _dummy_tc, *dummy_tc = &_dummy_tc; sack_block_t *block; if (!TCP_SCOREBOARD_TRACE) { s = format (s, "scoreboard tracing not enabled"); return s; } if (!tc) return s; clib_memset (dummy_tc, 0, sizeof (*dummy_tc)); tcp_connection_timers_init (dummy_tc); scoreboard_init (&dummy_tc->sack_sb); dummy_tc->rcv_opts.flags |= TCP_OPTS_FLAG_SACK; #if TCP_SCOREBOARD_TRACE trace = tc->sack_sb.trace; trace_len = vec_len (tc->sack_sb.trace); #endif for (i = 0; i < trace_len; i++) { if (trace[i].ack != 0) { dummy_tc->snd_una = trace[i].ack - 1448; dummy_tc->snd_una_max = trace[i].ack; } } left = 0; while (left < trace_len) { group = trace[left].group; vec_reset_length (dummy_tc->rcv_opts.sacks); has_new_ack = 0; while (trace[left].group == group) { if (trace[left].ack != 0) { if (verbose) s = format (s, "Adding ack %u, snd_una_max %u, segs: ", trace[left].ack, trace[left].snd_una_max); dummy_tc->snd_una_max = trace[left].snd_una_max; next_ack = trace[left].ack; has_new_ack = 1; } else { if (verbose) s = format (s, "[%u, %u], ", trace[left].start, trace[left].end); vec_add2 (dummy_tc->rcv_opts.sacks, block, 1); block->start = trace[left].start; block->end = trace[left].end; } left++; } /* Push segments */ tcp_rcv_sacks (dummy_tc, next_ack); if (has_new_ack) dummy_tc->snd_una = next_ack; if (verbose) s = format (s, "result: %U", format_tcp_scoreboard, &dummy_tc->sack_sb); } s = format (s, "result: %U", format_tcp_scoreboard, &dummy_tc->sack_sb); return s; } static clib_error_t * tcp_scoreboard_trace_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd_arg) { transport_connection_t *tconn = 0; tcp_connection_t *tc = 0; u8 *str = 0; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "%U", unformat_transport_connection, &tconn, TRANSPORT_PROTO_TCP)) ; else return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); } if (!TCP_SCOREBOARD_TRACE) { vlib_cli_output (vm, "scoreboard tracing not enabled"); return 0; } tc = tcp_get_connection_from_transport (tconn); if (!tc) { vlib_cli_output (vm, "connection not found"); return 0; } str = tcp_scoreboard_replay (str, tc, 1); vlib_cli_output (vm, "%v", str); return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (tcp_replay_scoreboard_command, static) = { .path = "tcp replay scoreboard", .short_help = "tcp replay scoreboard <connection>", .function = tcp_scoreboard_trace_fn, }; /* *INDENT-ON* */ static clib_error_t * show_tcp_punt_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd_arg) { tcp_main_t *tm = vnet_get_tcp_main (); if (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); vlib_cli_output (vm, "IPv4 TCP punt: %s", tm->punt_unknown4 ? "enabled" : "disabled"); vlib_cli_output (vm, "IPv6 TCP punt: %s", tm->punt_unknown6 ? "enabled" : "disabled"); return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (show_tcp_punt_command, static) = { .path = "show tcp punt", .short_help = "show tcp punt", .function = show_tcp_punt_fn, }; /* *INDENT-ON* */ static clib_error_t * show_tcp_stats_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { tcp_main_t *tm = vnet_get_tcp_main (); tcp_worker_ctx_t *wrk; u32 thread; if (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); for (thread = 0; thread < vec_len (tm->wrk_ctx); thread++) { wrk = tcp_get_worker (thread); vlib_cli_output (vm, "Thread %u:\n", thread); if (clib_fifo_elts (wrk->pending_timers)) vlib_cli_output (vm, " %lu pending timers", clib_fifo_elts (wrk->pending_timers)); #define _(name,type,str) \ if (wrk->stats.name) \ vlib_cli_output (vm, " %lu %s", wrk->stats.name, str); foreach_tcp_wrk_stat #undef _ } return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (show_tcp_stats_command, static) = { .path = "show tcp stats", .short_help = "show tcp stats", .function = show_tcp_stats_fn, }; /* *INDENT-ON* */ static clib_error_t * clear_tcp_stats_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { tcp_main_t *tm = vnet_get_tcp_main (); tcp_worker_ctx_t *wrk; u32 thread; if (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); for (thread = 0; thread < vec_len (tm->wrk_ctx); thread++) { wrk = tcp_get_worker (thread); clib_memset (&wrk->stats, 0, sizeof (wrk->stats)); } return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (clear_tcp_stats_command, static) = { .path = "clear tcp stats", .short_help = "clear tcp stats", .function = clear_tcp_stats_fn, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */