2 * Copyright (c) 2016-2019 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
18 * @brief TCP host stack utilities
21 #include <vnet/tcp/tcp.h>
22 #include <vnet/tcp/tcp_inlines.h>
23 #include <vnet/session/session.h>
24 #include <vnet/fib/fib.h>
25 #include <vnet/dpo/load_balance.h>
32 fib_protocol_t nh_proto;
33 vnet_link_t link_type;
37 } tcp_add_del_adj_args_t;
40 tcp_add_del_adj_cb (tcp_add_del_adj_args_t * args)
45 adj_nbr_add_or_lock (args->nh_proto, args->link_type, &args->ip,
50 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &args->ip,
52 if (ai != ADJ_INDEX_INVALID)
58 tcp_add_del_adjacency (tcp_connection_t * tc, u8 is_add)
60 tcp_add_del_adj_args_t args = {
61 .nh_proto = FIB_PROTOCOL_IP6,
62 .link_type = VNET_LINK_IP6,
64 .sw_if_index = tc->sw_if_index,
67 vlib_rpc_call_main_thread (tcp_add_del_adj_cb, (u8 *) & args,
72 tcp_cc_init (tcp_connection_t * tc)
74 tc->cc_algo->init (tc);
78 tcp_cc_cleanup (tcp_connection_t * tc)
80 if (tc->cc_algo->cleanup)
81 tc->cc_algo->cleanup (tc);
85 tcp_cc_algo_register (tcp_cc_algorithm_type_e type,
86 const tcp_cc_algorithm_t * vft)
88 tcp_main_t *tm = vnet_get_tcp_main ();
89 vec_validate (tm->cc_algos, type);
91 tm->cc_algos[type] = *vft;
92 hash_set_mem (tm->cc_algo_by_name, vft->name, type);
96 tcp_cc_algo_get (tcp_cc_algorithm_type_e type)
98 tcp_main_t *tm = vnet_get_tcp_main ();
99 return &tm->cc_algos[type];
102 tcp_cc_algorithm_type_e
103 tcp_cc_algo_new_type (const tcp_cc_algorithm_t * vft)
105 tcp_main_t *tm = vnet_get_tcp_main ();
106 tcp_cc_algo_register (++tm->cc_last_type, vft);
107 return tm->cc_last_type;
111 tcp_connection_bind (u32 session_index, transport_endpoint_t * lcl)
113 tcp_main_t *tm = &tcp_main;
114 tcp_connection_t *listener;
117 pool_get (tm->listener_pool, listener);
118 clib_memset (listener, 0, sizeof (*listener));
120 listener->c_c_index = listener - tm->listener_pool;
121 listener->c_lcl_port = lcl->port;
123 /* If we are provided a sw_if_index, bind using one of its ips */
124 if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX)
126 if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index,
128 ip_set (&lcl->ip, iface_ip, lcl->is_ip4);
130 ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4);
131 listener->c_is_ip4 = lcl->is_ip4;
132 listener->c_proto = TRANSPORT_PROTO_TCP;
133 listener->c_s_index = session_index;
134 listener->c_fib_index = lcl->fib_index;
135 listener->state = TCP_STATE_LISTEN;
136 listener->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo);
138 tcp_connection_timers_init (listener);
140 TCP_EVT (TCP_EVT_BIND, listener);
142 return listener->c_c_index;
146 tcp_session_bind (u32 session_index, transport_endpoint_t * tep)
148 return tcp_connection_bind (session_index, tep);
152 tcp_connection_unbind (u32 listener_index)
154 tcp_main_t *tm = vnet_get_tcp_main ();
155 tcp_connection_t *tc;
157 tc = pool_elt_at_index (tm->listener_pool, listener_index);
159 TCP_EVT (TCP_EVT_UNBIND, tc);
161 /* Poison the entry */
163 clib_memset (tc, 0xFA, sizeof (*tc));
165 pool_put_index (tm->listener_pool, listener_index);
169 tcp_session_unbind (u32 listener_index)
171 tcp_connection_unbind (listener_index);
175 static transport_connection_t *
176 tcp_session_get_listener (u32 listener_index)
178 tcp_main_t *tm = vnet_get_tcp_main ();
179 tcp_connection_t *tc;
180 tc = pool_elt_at_index (tm->listener_pool, listener_index);
181 return &tc->connection;
185 * Cleanup half-open connection
189 tcp_half_open_connection_free (tcp_connection_t * tc)
191 tcp_main_t *tm = vnet_get_tcp_main ();
193 clib_memset (tc, 0xFA, sizeof (*tc));
194 pool_put (tm->half_open_connections, tc);
198 * Try to cleanup half-open connection
200 * If called from a thread that doesn't own tc, the call won't have any
203 * @param tc - connection to be cleaned up
204 * @return non-zero if cleanup failed.
207 tcp_half_open_connection_cleanup (tcp_connection_t * tc)
209 tcp_worker_ctx_t *wrk;
211 /* Make sure this is the owning thread */
212 if (tc->c_thread_index != vlib_get_thread_index ())
215 session_half_open_delete_notify (&tc->connection);
216 wrk = tcp_get_worker (tc->c_thread_index);
217 tcp_timer_reset (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN);
218 tcp_half_open_connection_free (tc);
222 static tcp_connection_t *
223 tcp_half_open_connection_new (void)
225 tcp_main_t *tm = vnet_get_tcp_main ();
226 tcp_connection_t *tc = 0;
227 ASSERT (vlib_get_thread_index () == 0);
228 pool_get (tm->half_open_connections, tc);
229 clib_memset (tc, 0, sizeof (*tc));
230 tc->c_c_index = tc - tm->half_open_connections;
235 * Cleans up connection state.
240 tcp_connection_cleanup (tcp_connection_t * tc)
242 TCP_EVT (TCP_EVT_DELETE, tc);
244 /* Cleanup local endpoint if this was an active connect */
245 if (!(tc->cfg_flags & TCP_CFG_F_NO_ENDPOINT))
246 transport_endpoint_cleanup (TRANSPORT_PROTO_TCP, &tc->c_lcl_ip,
249 /* Check if connection is not yet fully established */
250 if (tc->state == TCP_STATE_SYN_SENT)
252 /* Try to remove the half-open connection. If this is not the owning
253 * thread, tc won't be removed. Retransmit or establish timers will
254 * eventually expire and call again cleanup on the right thread. */
255 if (tcp_half_open_connection_cleanup (tc))
256 tc->flags |= TCP_CONN_HALF_OPEN_DONE;
260 /* Make sure all timers are cleared */
261 tcp_connection_timers_reset (tc);
263 if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
264 tcp_add_del_adjacency (tc, 0);
267 vec_free (tc->snd_sacks);
268 vec_free (tc->snd_sacks_fl);
269 vec_free (tc->rcv_opts.sacks);
270 pool_free (tc->sack_sb.holes);
272 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
275 tcp_connection_free (tc);
280 * Connection removal.
282 * This should be called only once connection enters CLOSED state. Note
283 * that it notifies the session of the removal event, so if the goal is to
284 * just remove the connection, call tcp_connection_cleanup instead.
287 tcp_connection_del (tcp_connection_t * tc)
289 session_transport_delete_notify (&tc->connection);
290 tcp_connection_cleanup (tc);
294 tcp_connection_alloc (u8 thread_index)
296 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
297 tcp_connection_t *tc;
299 pool_get (wrk->connections, tc);
300 clib_memset (tc, 0, sizeof (*tc));
301 tc->c_c_index = tc - wrk->connections;
302 tc->c_thread_index = thread_index;
307 tcp_connection_alloc_w_base (u8 thread_index, tcp_connection_t * base)
309 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
310 tcp_connection_t *tc;
312 pool_get (wrk->connections, tc);
313 clib_memcpy_fast (tc, base, sizeof (*tc));
314 tc->c_c_index = tc - wrk->connections;
315 tc->c_thread_index = thread_index;
320 tcp_connection_free (tcp_connection_t * tc)
322 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
325 clib_memset (tc, 0xFA, sizeof (*tc));
326 pool_put (wrk->connections, tc);
329 pool_put (wrk->connections, tc);
333 tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
335 tcp_cleanup_req_t *req;
336 clib_time_type_t now;
338 now = tcp_time_now_us (tc->c_thread_index);
339 clib_fifo_add2 (wrk->pending_cleanups, req);
340 req->connection_index = tc->c_c_index;
341 req->free_time = now + tcp_cfg.cleanup_time;
345 * Begin connection closing procedure.
347 * If at the end the connection is not in CLOSED state, it is not removed.
348 * Instead, we rely on on TCP to advance through state machine to either
349 * 1) LAST_ACK (passive close) whereby when the last ACK is received
350 * tcp_connection_del is called. This notifies session of the delete and
352 * 2) TIME_WAIT (active close) whereby after 2MSL the 2MSL timer triggers
353 * and cleanup is called.
357 tcp_connection_close (tcp_connection_t * tc)
359 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
361 TCP_EVT (TCP_EVT_CLOSE, tc);
363 /* Send/Program FIN if needed and switch state */
366 case TCP_STATE_SYN_SENT:
367 /* Try to cleanup. If not on the right thread, mark as half-open done.
368 * Connection will be cleaned up when establish timer pops */
369 tcp_connection_cleanup (tc);
371 case TCP_STATE_SYN_RCVD:
372 tcp_connection_timers_reset (tc);
374 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
375 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
376 tcp_cfg.finwait1_time);
378 case TCP_STATE_ESTABLISHED:
379 /* If closing with unread data, reset the connection */
380 if (transport_max_rx_dequeue (&tc->connection))
383 tcp_connection_timers_reset (tc);
384 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
385 session_transport_closed_notify (&tc->connection);
386 tcp_program_cleanup (tcp_get_worker (tc->c_thread_index), tc);
387 tcp_worker_stats_inc (wrk, rst_unread, 1);
390 if (!transport_max_tx_dequeue (&tc->connection))
393 tc->flags |= TCP_CONN_FINPNDG;
394 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
395 /* Set a timer in case the peer stops responding. Otherwise the
396 * connection will be stuck here forever. */
397 ASSERT (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID);
398 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
399 tcp_cfg.finwait1_time);
401 case TCP_STATE_CLOSE_WAIT:
402 if (!transport_max_tx_dequeue (&tc->connection))
405 tcp_connection_timers_reset (tc);
406 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
407 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
408 tcp_cfg.lastack_time);
411 tc->flags |= TCP_CONN_FINPNDG;
413 case TCP_STATE_FIN_WAIT_1:
414 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
415 tcp_cfg.finwait1_time);
417 case TCP_STATE_CLOSED:
418 /* Cleanup should've been programmed already */
421 TCP_DBG ("state: %u", tc->state);
426 tcp_session_half_close (u32 conn_index, u32 thread_index)
428 tcp_worker_ctx_t *wrk;
429 tcp_connection_t *tc;
431 tc = tcp_connection_get (conn_index, thread_index);
432 wrk = tcp_get_worker (tc->c_thread_index);
434 /* If the connection is not in ESTABLISHED state, ignore it */
435 if (tc->state != TCP_STATE_ESTABLISHED)
437 if (!transport_max_tx_dequeue (&tc->connection))
440 tc->flags |= TCP_CONN_FINPNDG;
441 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
442 /* Set a timer in case the peer stops responding. Otherwise the
443 * connection will be stuck here forever. */
444 ASSERT (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID);
445 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
446 tcp_cfg.finwait1_time);
450 tcp_session_close (u32 conn_index, u32 thread_index)
452 tcp_connection_t *tc;
453 tc = tcp_connection_get (conn_index, thread_index);
454 tcp_connection_close (tc);
458 tcp_session_cleanup (u32 conn_index, u32 thread_index)
460 tcp_connection_t *tc;
461 tc = tcp_connection_get (conn_index, thread_index);
464 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
465 tcp_connection_cleanup (tc);
469 tcp_session_cleanup_ho (u32 conn_index)
471 tcp_worker_ctx_t *wrk;
472 tcp_connection_t *tc;
474 tc = tcp_half_open_connection_get (conn_index);
475 wrk = tcp_get_worker (tc->c_thread_index);
476 tcp_timer_reset (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN);
477 tcp_half_open_connection_free (tc);
481 tcp_session_reset (u32 conn_index, u32 thread_index)
483 tcp_connection_t *tc;
484 tc = tcp_connection_get (conn_index, thread_index);
486 tcp_connection_timers_reset (tc);
487 tcp_cong_recovery_off (tc);
488 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
489 session_transport_closed_notify (&tc->connection);
490 tcp_program_cleanup (tcp_get_worker (thread_index), tc);
494 * Initialize all connection timers as invalid
497 tcp_connection_timers_init (tcp_connection_t * tc)
501 /* Set all to invalid */
502 for (i = 0; i < TCP_N_TIMERS; i++)
504 tc->timers[i] = TCP_TIMER_HANDLE_INVALID;
507 tc->rto = TCP_RTO_INIT;
511 * Stop all connection timers
514 tcp_connection_timers_reset (tcp_connection_t * tc)
516 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
519 for (i = 0; i < TCP_N_TIMERS; i++)
520 tcp_timer_reset (&wrk->timer_wheel, tc, i);
524 typedef struct ip4_tcp_hdr
530 typedef struct ip6_tcp_hdr
537 tcp_connection_select_lb_bucket (tcp_connection_t * tc, const dpo_id_t * dpo,
540 const dpo_id_t *choice;
544 lb = load_balance_get (dpo->dpoi_index);
548 clib_memset (&hdr, 0, sizeof (hdr));
549 hdr.ip.protocol = IP_PROTOCOL_TCP;
550 hdr.ip.address_pair.src.as_u32 = tc->c_lcl_ip.ip4.as_u32;
551 hdr.ip.address_pair.dst.as_u32 = tc->c_rmt_ip.ip4.as_u32;
552 hdr.tcp.src_port = tc->c_lcl_port;
553 hdr.tcp.dst_port = tc->c_rmt_port;
554 hash = ip4_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
559 clib_memset (&hdr, 0, sizeof (hdr));
560 hdr.ip.protocol = IP_PROTOCOL_TCP;
561 clib_memcpy_fast (&hdr.ip.src_address, &tc->c_lcl_ip.ip6,
562 sizeof (ip6_address_t));
563 clib_memcpy_fast (&hdr.ip.dst_address, &tc->c_rmt_ip.ip6,
564 sizeof (ip6_address_t));
565 hdr.tcp.src_port = tc->c_lcl_port;
566 hdr.tcp.dst_port = tc->c_rmt_port;
567 hash = ip6_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
569 choice = load_balance_get_bucket_i (lb, hash & lb->lb_n_buckets_minus_1);
570 dpo_copy (result, choice);
574 tcp_lookup_rmt_in_fib (tcp_connection_t * tc)
579 clib_memcpy_fast (&prefix.fp_addr, &tc->c_rmt_ip, sizeof (prefix.fp_addr));
580 prefix.fp_proto = tc->c_is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
581 prefix.fp_len = tc->c_is_ip4 ? 32 : 128;
582 fib_index = fib_table_find (prefix.fp_proto, tc->c_fib_index);
583 return fib_table_lookup (fib_index, &prefix);
587 tcp_connection_stack_on_fib_entry (tcp_connection_t * tc)
589 dpo_id_t choice = DPO_INVALID;
590 u32 output_node_index;
593 fe = fib_entry_get (tc->c_rmt_fei);
594 if (fe->fe_lb.dpoi_type != DPO_LOAD_BALANCE)
597 tcp_connection_select_lb_bucket (tc, &fe->fe_lb, &choice);
600 tc->c_is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
601 dpo_stack_from_node (output_node_index, &tc->c_rmt_dpo, &choice);
605 /** Stack tcp connection on peer's fib entry.
607 * This ultimately populates the dpo the connection will use to send packets.
610 tcp_connection_fib_attach (tcp_connection_t * tc)
612 tc->c_rmt_fei = tcp_lookup_rmt_in_fib (tc);
614 ASSERT (tc->c_rmt_fei != FIB_NODE_INDEX_INVALID);
616 tcp_connection_stack_on_fib_entry (tc);
621 * Generate random iss as per rfc6528
624 tcp_generate_random_iss (tcp_connection_t * tc)
626 tcp_main_t *tm = &tcp_main;
630 tmp = (u64) tc->c_lcl_ip.ip4.as_u32 << 32 | (u64) tc->c_rmt_ip.ip4.as_u32;
632 tmp = tc->c_lcl_ip.ip6.as_u64[0] ^ tc->c_lcl_ip.ip6.as_u64[1]
633 ^ tc->c_rmt_ip.ip6.as_u64[0] ^ tc->c_rmt_ip.ip6.as_u64[1];
635 tmp ^= tm->iss_seed.first | ((u64) tc->c_lcl_port << 16 | tc->c_rmt_port);
636 tmp ^= tm->iss_seed.second;
637 tmp = clib_xxhash (tmp) + clib_cpu_time_now ();
638 return ((tmp >> 32) ^ (tmp & 0xffffffff));
642 * Initialize max segment size we're able to process.
644 * The value is constrained by the output interface's MTU and by the size
645 * of the IP and TCP headers (see RFC6691). It is also what we advertise
649 tcp_init_rcv_mss (tcp_connection_t * tc)
653 /* Already provided at connection init time */
657 ip_hdr_len = tc->c_is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
658 tc->mss = tcp_cfg.default_mtu - sizeof (tcp_header_t) - ip_hdr_len;
662 tcp_init_mss (tcp_connection_t * tc)
664 u16 default_min_mss = 536;
666 tcp_init_rcv_mss (tc);
668 /* TODO consider PMTU discovery */
669 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
671 if (tc->snd_mss < 45)
673 /* Assume that at least the min default mss works */
674 tc->snd_mss = default_min_mss;
675 tc->rcv_opts.mss = default_min_mss;
678 /* We should have enough space for 40 bytes of options */
679 ASSERT (tc->snd_mss > 45);
681 /* If we use timestamp option, account for it and make sure
682 * the options are 4-byte aligned */
683 if (tcp_opts_tstamp (&tc->rcv_opts))
684 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP + 2 /* alignment */;
688 * Initialize connection send variables.
691 tcp_init_snd_vars (tcp_connection_t * tc)
694 * We use the time to randomize iss and for setting up the initial
695 * timestamp. Make sure it's updated otherwise syn and ack in the
696 * handshake may make it look as if time has flown in the opposite
699 tcp_update_time_now (tcp_get_worker (vlib_get_thread_index ()));
701 tcp_init_rcv_mss (tc);
702 tc->iss = tcp_generate_random_iss (tc);
703 tc->snd_una = tc->iss;
704 tc->snd_nxt = tc->iss + 1;
705 tc->srtt = 0.1 * THZ; /* 100 ms */
707 if (!tcp_cfg.csum_offload)
708 tc->cfg_flags |= TCP_CFG_F_NO_CSUM_OFFLOAD;
712 tcp_enable_pacing (tcp_connection_t * tc)
715 byte_rate = tc->cwnd / (tc->srtt * TCP_TICK);
716 transport_connection_tx_pacer_init (&tc->connection, byte_rate, tc->cwnd);
717 tc->mrtt_us = (u32) ~ 0;
720 /** Initialize tcp connection variables
722 * Should be called after having received a msg from the peer, i.e., a SYN or
723 * a SYNACK, such that connection options have already been exchanged. */
725 tcp_connection_init_vars (tcp_connection_t * tc)
727 tcp_connection_timers_init (tc);
729 scoreboard_init (&tc->sack_sb);
730 if (tc->state == TCP_STATE_SYN_RCVD)
731 tcp_init_snd_vars (tc);
735 if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
736 tcp_add_del_adjacency (tc, 1);
738 /* tcp_connection_fib_attach (tc); */
740 if (transport_connection_is_tx_paced (&tc->connection)
741 || tcp_cfg.enable_tx_pacing)
742 tcp_enable_pacing (tc);
744 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
747 if (!tcp_cfg.allow_tso)
748 tc->cfg_flags |= TCP_CFG_F_NO_TSO;
750 tc->start_ts = tcp_time_now_us (tc->c_thread_index);
754 tcp_alloc_custom_local_endpoint (tcp_main_t * tm, ip46_address_t * lcl_addr,
755 u16 * lcl_port, u8 is_ip4)
760 index = tm->last_v4_addr_rotor++;
761 if (tm->last_v4_addr_rotor >= vec_len (tcp_cfg.ip4_src_addrs))
762 tm->last_v4_addr_rotor = 0;
763 lcl_addr->ip4.as_u32 = tcp_cfg.ip4_src_addrs[index].as_u32;
767 index = tm->last_v6_addr_rotor++;
768 if (tm->last_v6_addr_rotor >= vec_len (tcp_cfg.ip6_src_addrs))
769 tm->last_v6_addr_rotor = 0;
770 clib_memcpy_fast (&lcl_addr->ip6, &tcp_cfg.ip6_src_addrs[index],
771 sizeof (ip6_address_t));
773 port = transport_alloc_local_port (TRANSPORT_PROTO_TCP, lcl_addr);
775 return SESSION_E_NOPORT;
781 tcp_session_open (transport_endpoint_cfg_t * rmt)
783 tcp_main_t *tm = vnet_get_tcp_main ();
784 tcp_connection_t *tc;
785 ip46_address_t lcl_addr;
790 * Allocate local endpoint
792 if ((rmt->is_ip4 && vec_len (tcp_cfg.ip4_src_addrs))
793 || (!rmt->is_ip4 && vec_len (tcp_cfg.ip6_src_addrs)))
794 rv = tcp_alloc_custom_local_endpoint (tm, &lcl_addr, &lcl_port,
797 rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_TCP,
798 rmt, &lcl_addr, &lcl_port);
802 if (rv != SESSION_E_PORTINUSE)
805 if (session_lookup_connection (rmt->fib_index, &lcl_addr, &rmt->ip,
806 lcl_port, rmt->port, TRANSPORT_PROTO_UDP,
808 return SESSION_E_PORTINUSE;
810 /* 5-tuple is available so increase lcl endpoint refcount and proceed
811 * with connection allocation */
812 transport_share_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr,
817 * Create connection and send SYN
819 tc = tcp_half_open_connection_new ();
820 ip_copy (&tc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
821 ip_copy (&tc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
822 tc->c_rmt_port = rmt->port;
823 tc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
824 tc->c_is_ip4 = rmt->is_ip4;
825 tc->c_proto = TRANSPORT_PROTO_TCP;
826 tc->c_fib_index = rmt->fib_index;
827 tc->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo);
828 /* The other connection vars will be initialized after SYN ACK */
829 tcp_connection_timers_init (tc);
832 TCP_EVT (TCP_EVT_OPEN, tc);
833 tc->state = TCP_STATE_SYN_SENT;
834 tcp_init_snd_vars (tc);
837 return tc->c_c_index;
841 format_tcp_session (u8 * s, va_list * args)
843 u32 tci = va_arg (*args, u32);
844 u32 thread_index = va_arg (*args, u32);
845 u32 verbose = va_arg (*args, u32);
846 tcp_connection_t *tc;
848 tc = tcp_connection_get (tci, thread_index);
850 s = format (s, "%U", format_tcp_connection, tc, verbose);
852 s = format (s, "empty\n");
857 format_tcp_listener_session (u8 * s, va_list * args)
859 u32 tci = va_arg (*args, u32);
860 u32 __clib_unused thread_index = va_arg (*args, u32);
861 u32 verbose = va_arg (*args, u32);
862 tcp_connection_t *tc = tcp_listener_get (tci);
863 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_tcp_connection_id, tc);
865 s = format (s, "%-" SESSION_CLI_STATE_LEN "U", format_tcp_state,
871 format_tcp_half_open_session (u8 * s, va_list * args)
873 u32 tci = va_arg (*args, u32);
874 u32 __clib_unused thread_index = va_arg (*args, u32);
875 u32 verbose = va_arg (*args, u32);
876 tcp_connection_t *tc;
879 tc = tcp_half_open_connection_get (tci);
880 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
881 state = format (state, "%s", "CLOSED");
883 state = format (state, "%U", format_tcp_state, tc->state);
884 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_tcp_connection_id, tc);
886 s = format (s, "%-" SESSION_CLI_STATE_LEN "v", state);
891 static transport_connection_t *
892 tcp_session_get_transport (u32 conn_index, u32 thread_index)
894 tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index);
895 if (PREDICT_FALSE (!tc))
897 return &tc->connection;
900 static transport_connection_t *
901 tcp_half_open_session_get_transport (u32 conn_index)
903 tcp_connection_t *tc = tcp_half_open_connection_get (conn_index);
904 return &tc->connection;
908 tcp_set_attribute (tcp_connection_t *tc, transport_endpt_attr_t *attr)
914 case TRANSPORT_ENDPT_ATTR_NEXT_OUTPUT_NODE:
915 tc->next_node_index = attr->next_output_node & 0xffffffff;
916 tc->next_node_opaque = attr->next_output_node >> 32;
918 case TRANSPORT_ENDPT_ATTR_MSS:
920 tc->snd_mss = clib_min (tc->snd_mss, tc->mss);
922 case TRANSPORT_ENDPT_ATTR_FLAGS:
923 if (attr->flags & TRANSPORT_ENDPT_ATTR_F_CSUM_OFFLOAD)
924 tc->cfg_flags |= TCP_CFG_F_NO_CSUM_OFFLOAD;
926 tc->cfg_flags &= ~TCP_CFG_F_NO_CSUM_OFFLOAD;
927 if (attr->flags & TRANSPORT_ENDPT_ATTR_F_GSO)
929 if (!(tc->cfg_flags & TCP_CFG_F_TSO))
931 tc->cfg_flags &= ~TCP_CFG_F_NO_TSO;
935 tc->cfg_flags |= TCP_CFG_F_NO_TSO;
936 tc->cfg_flags &= ~TCP_CFG_F_TSO;
938 if (attr->flags & TRANSPORT_ENDPT_ATTR_F_RATE_SAMPLING)
940 if (!(tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE))
942 tc->cfg_flags |= TCP_CFG_F_RATE_SAMPLE;
946 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
948 tc->cfg_flags &= ~TCP_CFG_F_RATE_SAMPLE;
951 case TRANSPORT_ENDPT_ATTR_CC_ALGO:
952 if (tc->cc_algo == tcp_cc_algo_get (attr->cc_algo))
955 tc->cc_algo = tcp_cc_algo_get (attr->cc_algo);
967 tcp_get_attribute (tcp_connection_t *tc, transport_endpt_attr_t *attr)
974 case TRANSPORT_ENDPT_ATTR_NEXT_OUTPUT_NODE:
975 non = (u64) tc->next_node_opaque << 32 | tc->next_node_index;
976 attr->next_output_node = non;
978 case TRANSPORT_ENDPT_ATTR_MSS:
979 attr->mss = tc->snd_mss;
981 case TRANSPORT_ENDPT_ATTR_FLAGS:
983 if (!(tc->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD))
984 attr->flags |= TRANSPORT_ENDPT_ATTR_F_CSUM_OFFLOAD;
985 if (tc->cfg_flags & TCP_CFG_F_TSO)
986 attr->flags |= TRANSPORT_ENDPT_ATTR_F_GSO;
987 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
988 attr->flags |= TRANSPORT_ENDPT_ATTR_F_RATE_SAMPLING;
990 case TRANSPORT_ENDPT_ATTR_CC_ALGO:
991 attr->cc_algo = tc->cc_algo - tcp_main.cc_algos;
1002 tcp_session_attribute (u32 conn_index, u32 thread_index, u8 is_get,
1003 transport_endpt_attr_t *attr)
1005 tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index);
1007 if (PREDICT_FALSE (!tc))
1011 return tcp_get_attribute (tc, attr);
1013 return tcp_set_attribute (tc, attr);
1017 tcp_session_cal_goal_size (tcp_connection_t * tc)
1019 u16 goal_size = tc->snd_mss;
1021 goal_size = tcp_cfg.max_gso_size - tc->snd_mss % tcp_cfg.max_gso_size;
1022 goal_size = clib_min (goal_size, tc->snd_wnd / 2);
1024 return goal_size > tc->snd_mss ? goal_size : tc->snd_mss;
1028 tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space)
1030 if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
1032 return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0;
1035 /* If not snd_wnd constrained and we can't write at least a segment,
1036 * don't try at all */
1037 if (PREDICT_FALSE (snd_space < tc->snd_mss))
1038 return snd_space < tc->cwnd ? 0 : snd_space;
1040 /* round down to mss multiple */
1041 return snd_space - (snd_space % tc->snd_mss);
1045 * Compute tx window session is allowed to fill.
1047 * Takes into account available send space, snd_mss and the congestion
1048 * state of the connection. If possible, the value returned is a multiple
1051 * @param tc tcp connection
1052 * @return number of bytes session is allowed to write
1055 tcp_snd_space_inline (tcp_connection_t * tc)
1059 /* Fast path is disabled when recovery is on. @ref tcp_session_custom_tx
1060 * controls both retransmits and the sending of new data while congested
1062 if (PREDICT_FALSE (tcp_in_cong_recovery (tc)
1063 || tc->state == TCP_STATE_CLOSED))
1066 snd_space = tcp_available_output_snd_space (tc);
1068 /* If we got dupacks or sacked bytes but we're not yet in recovery, try
1069 * to force the peer to send enough dupacks to start retransmitting as
1070 * per Limited Transmit (RFC3042)
1072 if (PREDICT_FALSE (tc->rcv_dupacks || tc->sack_sb.sacked_bytes))
1074 int snt_limited, n_pkts;
1076 n_pkts = tcp_opts_sack_permitted (&tc->rcv_opts)
1077 ? tc->sack_sb.reorder - 1 : 2;
1079 if ((seq_lt (tc->limited_transmit, tc->snd_nxt - n_pkts * tc->snd_mss)
1080 || seq_gt (tc->limited_transmit, tc->snd_nxt)))
1081 tc->limited_transmit = tc->snd_nxt;
1083 ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt));
1085 snt_limited = tc->snd_nxt - tc->limited_transmit;
1086 snd_space = clib_max (n_pkts * tc->snd_mss - snt_limited, 0);
1088 return tcp_round_snd_space (tc, snd_space);
1092 tcp_snd_space (tcp_connection_t * tc)
1094 return tcp_snd_space_inline (tc);
1098 tcp_session_send_params (transport_connection_t * trans_conn,
1099 transport_send_params_t * sp)
1101 tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1103 /* Ensure snd_mss does accurately reflect the amount of data we can push
1104 * in a segment. This also makes sure that options are updated according to
1105 * the current state of the connection. */
1106 tcp_update_burst_snd_vars (tc);
1108 if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_TSO))
1109 sp->snd_mss = tcp_session_cal_goal_size (tc);
1111 sp->snd_mss = tc->snd_mss;
1113 sp->snd_space = clib_min (tcp_snd_space_inline (tc),
1114 tc->snd_wnd - (tc->snd_nxt - tc->snd_una));
1116 ASSERT (seq_geq (tc->snd_nxt, tc->snd_una));
1117 /* This still works if fast retransmit is on */
1118 sp->tx_offset = tc->snd_nxt - tc->snd_una;
1120 sp->flags = sp->snd_space ? 0 : TRANSPORT_SND_F_DESCHED;
1126 tcp_timer_waitclose_handler (tcp_connection_t * tc)
1128 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1132 case TCP_STATE_CLOSE_WAIT:
1133 tcp_connection_timers_reset (tc);
1134 /* App never returned with a close */
1135 if (!(tc->flags & TCP_CONN_FINPNDG))
1137 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1138 session_transport_closed_notify (&tc->connection);
1139 tcp_program_cleanup (wrk, tc);
1140 tcp_worker_stats_inc (wrk, to_closewait, 1);
1144 /* Send FIN either way and switch to LAST_ACK. */
1145 tcp_cong_recovery_off (tc);
1146 /* Make sure we don't try to send unsent data */
1147 tc->snd_nxt = tc->snd_una;
1149 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
1150 session_transport_closed_notify (&tc->connection);
1152 /* Make sure we don't wait in LAST ACK forever */
1153 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
1154 tcp_cfg.lastack_time);
1155 tcp_worker_stats_inc (wrk, to_closewait2, 1);
1157 /* Don't delete the connection yet */
1159 case TCP_STATE_FIN_WAIT_1:
1160 tcp_connection_timers_reset (tc);
1161 if (tc->flags & TCP_CONN_FINPNDG)
1163 /* If FIN pending, we haven't sent everything, but we did try.
1164 * Notify session layer that transport is closed. */
1165 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1166 tcp_send_reset (tc);
1167 tcp_program_cleanup (wrk, tc);
1171 /* We've sent the fin but no progress. Close the connection and
1172 * to make sure everything is flushed, setup a cleanup timer */
1173 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1174 tcp_program_cleanup (wrk, tc);
1176 session_transport_closed_notify (&tc->connection);
1177 tcp_worker_stats_inc (wrk, to_finwait1, 1);
1179 case TCP_STATE_LAST_ACK:
1180 tcp_connection_timers_reset (tc);
1181 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1182 session_transport_closed_notify (&tc->connection);
1183 tcp_program_cleanup (wrk, tc);
1184 tcp_worker_stats_inc (wrk, to_lastack, 1);
1186 case TCP_STATE_CLOSING:
1187 tcp_connection_timers_reset (tc);
1188 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1189 session_transport_closed_notify (&tc->connection);
1190 tcp_program_cleanup (wrk, tc);
1191 tcp_worker_stats_inc (wrk, to_closing, 1);
1193 case TCP_STATE_FIN_WAIT_2:
1194 tcp_send_reset (tc);
1195 tcp_connection_timers_reset (tc);
1196 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1197 session_transport_closed_notify (&tc->connection);
1198 tcp_program_cleanup (wrk, tc);
1199 tcp_worker_stats_inc (wrk, to_finwait2, 1);
1201 case TCP_STATE_TIME_WAIT:
1202 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1203 tcp_program_cleanup (wrk, tc);
1206 clib_warning ("waitclose in state: %U", format_tcp_state, tc->state);
1212 static timer_expiration_handler *timer_expiration_handlers[TCP_N_TIMERS] =
1214 tcp_timer_retransmit_handler,
1215 tcp_timer_persist_handler,
1216 tcp_timer_waitclose_handler,
1217 tcp_timer_retransmit_syn_handler,
1222 tcp_dispatch_pending_timers (tcp_worker_ctx_t * wrk)
1224 u32 n_timers, connection_index, timer_id, thread_index, timer_handle;
1225 tcp_connection_t *tc;
1228 if (!(n_timers = clib_fifo_elts (wrk->pending_timers)))
1231 thread_index = wrk->vm->thread_index;
1232 for (i = 0; i < clib_min (n_timers, wrk->max_timers_per_loop); i++)
1234 clib_fifo_sub1 (wrk->pending_timers, timer_handle);
1235 connection_index = timer_handle & 0x0FFFFFFF;
1236 timer_id = timer_handle >> 28;
1238 if (PREDICT_TRUE (timer_id != TCP_TIMER_RETRANSMIT_SYN))
1239 tc = tcp_connection_get (connection_index, thread_index);
1241 tc = tcp_half_open_connection_get (connection_index);
1243 if (PREDICT_FALSE (!tc))
1246 /* Skip if the timer is not pending. Probably it was reset while
1247 * waiting for dispatch */
1248 if (PREDICT_FALSE (!(tc->pending_timers & (1 << timer_id))))
1251 tc->pending_timers &= ~(1 << timer_id);
1253 /* Skip timer if it was rearmed while pending dispatch */
1254 if (PREDICT_FALSE (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID))
1257 (*timer_expiration_handlers[timer_id]) (tc);
1260 if (thread_index == 0 && clib_fifo_elts (wrk->pending_timers))
1261 session_queue_run_on_main_thread (wrk->vm);
1265 tcp_handle_cleanups (tcp_worker_ctx_t * wrk, clib_time_type_t now)
1267 u32 thread_index = wrk->vm->thread_index;
1268 tcp_cleanup_req_t *req;
1269 tcp_connection_t *tc;
1271 while (clib_fifo_elts (wrk->pending_cleanups))
1273 req = clib_fifo_head (wrk->pending_cleanups);
1274 if (req->free_time > now)
1276 clib_fifo_sub2 (wrk->pending_cleanups, req);
1277 tc = tcp_connection_get (req->connection_index, thread_index);
1278 if (PREDICT_FALSE (!tc))
1280 session_transport_delete_notify (&tc->connection);
1281 tcp_connection_cleanup (tc);
1286 tcp_update_time (f64 now, u8 thread_index)
1288 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1290 tcp_set_time_now (wrk, now);
1291 tcp_handle_cleanups (wrk, now);
1292 tcp_timer_expire_timers (&wrk->timer_wheel, now);
1293 tcp_dispatch_pending_timers (wrk);
1297 tcp_session_flush_data (transport_connection_t * tconn)
1299 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1300 if (tc->flags & TCP_CONN_PSH_PENDING)
1302 tc->flags |= TCP_CONN_PSH_PENDING;
1303 tc->psh_seq = tc->snd_una + transport_max_tx_dequeue (tconn) - 1;
1307 tcp_session_app_rx_evt (transport_connection_t *conn)
1309 tcp_connection_t *tc = (tcp_connection_t *) conn;
1310 u32 min_free, lo = 4 << 10, hi = 128 << 10;
1312 if (!(tc->flags & TCP_CONN_ZERO_RWND_SENT))
1315 min_free = clib_clamp (transport_rx_fifo_size (conn) >> 3, lo, hi);
1316 if (transport_max_rx_enqueue (conn) < min_free)
1318 transport_rx_fifo_req_deq_ntf (conn);
1328 const static transport_proto_vft_t tcp_proto = {
1329 .enable = vnet_tcp_enable_disable,
1330 .start_listen = tcp_session_bind,
1331 .stop_listen = tcp_session_unbind,
1332 .push_header = tcp_session_push_header,
1333 .get_connection = tcp_session_get_transport,
1334 .get_listener = tcp_session_get_listener,
1335 .get_half_open = tcp_half_open_session_get_transport,
1336 .attribute = tcp_session_attribute,
1337 .connect = tcp_session_open,
1338 .half_close = tcp_session_half_close,
1339 .close = tcp_session_close,
1340 .cleanup = tcp_session_cleanup,
1341 .cleanup_ho = tcp_session_cleanup_ho,
1342 .reset = tcp_session_reset,
1343 .send_params = tcp_session_send_params,
1344 .update_time = tcp_update_time,
1345 .flush_data = tcp_session_flush_data,
1346 .custom_tx = tcp_session_custom_tx,
1347 .app_rx_evt = tcp_session_app_rx_evt,
1348 .format_connection = format_tcp_session,
1349 .format_listener = format_tcp_listener_session,
1350 .format_half_open = format_tcp_half_open_session,
1351 .transport_options = {
1354 .tx_type = TRANSPORT_TX_PEEK,
1355 .service_type = TRANSPORT_SERVICE_VC,
1361 tcp_connection_tx_pacer_update (tcp_connection_t * tc)
1363 if (!transport_connection_is_tx_paced (&tc->connection))
1366 f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
1368 transport_connection_tx_pacer_update (&tc->connection,
1369 tcp_cc_get_pacing_rate (tc),
1370 srtt * CLIB_US_TIME_FREQ);
1374 tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
1377 f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
1378 transport_connection_tx_pacer_reset (&tc->connection,
1379 tcp_cc_get_pacing_rate (tc),
1381 srtt * CLIB_US_TIME_FREQ);
1385 tcp_reschedule (tcp_connection_t * tc)
1387 if (tcp_in_cong_recovery (tc) || tcp_snd_space_inline (tc))
1388 transport_connection_reschedule (&tc->connection);
1392 tcp_expired_timers_dispatch (u32 * expired_timers)
1394 u32 thread_index = vlib_get_thread_index (), n_left, max_per_loop;
1395 u32 connection_index, timer_id, n_expired, max_loops;
1396 tcp_worker_ctx_t *wrk;
1397 tcp_connection_t *tc;
1400 wrk = tcp_get_worker (thread_index);
1401 n_expired = vec_len (expired_timers);
1402 tcp_worker_stats_inc (wrk, timer_expirations, n_expired);
1403 n_left = clib_fifo_elts (wrk->pending_timers);
1406 * Invalidate all timer handles before dispatching. This avoids dangling
1407 * index references to timer wheel pool entries that have been freed.
1409 for (i = 0; i < n_expired; i++)
1411 connection_index = expired_timers[i] & 0x0FFFFFFF;
1412 timer_id = expired_timers[i] >> 28;
1414 if (timer_id != TCP_TIMER_RETRANSMIT_SYN)
1415 tc = tcp_connection_get (connection_index, thread_index);
1417 tc = tcp_half_open_connection_get (connection_index);
1419 TCP_EVT (TCP_EVT_TIMER_POP, connection_index, timer_id);
1421 tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
1422 tc->pending_timers |= (1 << timer_id);
1425 clib_fifo_add (wrk->pending_timers, expired_timers, n_expired);
1427 max_loops = clib_max (1, 0.5 * TCP_TIMER_TICK * wrk->vm->loops_per_second);
1428 max_per_loop = clib_max ((n_left + n_expired) / max_loops, 10);
1429 max_per_loop = clib_min (max_per_loop, VLIB_FRAME_SIZE);
1430 wrk->max_timers_per_loop = clib_max (n_left ? wrk->max_timers_per_loop : 0,
1433 if (thread_index == 0)
1434 session_queue_run_on_main_thread (wrk->vm);
1438 tcp_initialize_iss_seed (tcp_main_t * tm)
1440 u32 default_seed = random_default_seed ();
1441 u64 time_now = clib_cpu_time_now ();
1443 tm->iss_seed.first = (u64) random_u32 (&default_seed) << 32;
1444 tm->iss_seed.second = random_u64 (&time_now);
1447 static clib_error_t *
1448 tcp_main_enable (vlib_main_t * vm)
1450 vlib_thread_main_t *vtm = vlib_get_thread_main ();
1451 u32 num_threads, n_workers, prealloc_conn_per_wrk;
1452 tcp_connection_t *tc __attribute__ ((unused));
1453 tcp_main_t *tm = vnet_get_tcp_main ();
1454 tcp_worker_ctx_t *wrk;
1455 clib_error_t *error = 0;
1458 if ((error = vlib_call_init_function (vm, ip_main_init)))
1460 if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
1462 if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
1469 ip4_register_protocol (IP_PROTOCOL_TCP, tcp4_input_node.index);
1470 ip6_register_protocol (IP_PROTOCOL_TCP, tcp6_input_node.index);
1473 * Initialize data structures
1476 num_threads = 1 /* main thread */ + vtm->n_threads;
1477 vec_validate (tm->wrk_ctx, num_threads - 1);
1478 n_workers = num_threads == 1 ? 1 : vtm->n_threads;
1479 prealloc_conn_per_wrk = tcp_cfg.preallocated_connections / n_workers;
1481 wrk = &tm->wrk_ctx[0];
1482 wrk->tco_next_node[0] = vlib_node_get_next (vm, session_queue_node.index,
1483 tcp4_output_node.index);
1484 wrk->tco_next_node[1] = vlib_node_get_next (vm, session_queue_node.index,
1485 tcp6_output_node.index);
1487 for (thread = 0; thread < num_threads; thread++)
1489 wrk = &tm->wrk_ctx[thread];
1491 vec_validate (wrk->pending_deq_acked, 255);
1492 vec_validate (wrk->pending_disconnects, 255);
1493 vec_validate (wrk->pending_resets, 255);
1494 vec_reset_length (wrk->pending_deq_acked);
1495 vec_reset_length (wrk->pending_disconnects);
1496 vec_reset_length (wrk->pending_resets);
1497 wrk->vm = vlib_get_main_by_index (thread);
1498 wrk->max_timers_per_loop = 10;
1502 wrk->tco_next_node[0] = tm->wrk_ctx[0].tco_next_node[0];
1503 wrk->tco_next_node[1] = tm->wrk_ctx[0].tco_next_node[1];
1507 * Preallocate connections. Assume that thread 0 won't
1508 * use preallocated threads when running multi-core
1510 if ((thread > 0 || num_threads == 1) && prealloc_conn_per_wrk)
1511 pool_init_fixed (wrk->connections, prealloc_conn_per_wrk);
1513 tcp_timer_initialize_wheel (&wrk->timer_wheel,
1514 tcp_expired_timers_dispatch,
1515 vlib_time_now (vm));
1519 * Use a preallocated half-open connection pool?
1521 if (tcp_cfg.preallocated_half_open_connections)
1522 pool_init_fixed (tm->half_open_connections,
1523 tcp_cfg.preallocated_half_open_connections);
1525 tcp_initialize_iss_seed (tm);
1527 tm->bytes_per_buffer = vlib_buffer_get_default_data_size (vm);
1528 tm->cc_last_type = TCP_CC_LAST;
1530 tm->ipl_next_node[0] = vlib_node_get_next (vm, session_queue_node.index,
1531 ip4_lookup_node.index);
1532 tm->ipl_next_node[1] = vlib_node_get_next (vm, session_queue_node.index,
1533 ip6_lookup_node.index);
1538 vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en)
1542 if (tcp_main.is_enabled)
1545 return tcp_main_enable (vm);
1549 tcp_main.is_enabled = 0;
1556 tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add)
1558 tcp_main_t *tm = &tcp_main;
1560 tm->punt_unknown4 = is_add;
1562 tm->punt_unknown6 = is_add;
1566 * Initialize default values for tcp parameters
1569 tcp_configuration_init (void)
1571 /* Initial wnd for SYN. Fifos are not allocated at that point so use some
1572 * predefined value. For SYN-ACK we still want the scale to be computed in
1574 tcp_cfg.max_rx_fifo = 32 << 20;
1575 tcp_cfg.min_rx_fifo = 4 << 10;
1577 tcp_cfg.default_mtu = 1500;
1578 tcp_cfg.initial_cwnd_multiplier = 0;
1579 tcp_cfg.enable_tx_pacing = 1;
1580 tcp_cfg.allow_tso = 0;
1581 tcp_cfg.csum_offload = 1;
1582 tcp_cfg.cc_algo = TCP_CC_CUBIC;
1583 tcp_cfg.rwnd_min_update_ack = 1;
1584 tcp_cfg.max_gso_size = TCP_MAX_GSO_SZ;
1586 /* Time constants defined as timer tick (100us) multiples */
1587 tcp_cfg.closewait_time = 20000; /* 2s */
1588 tcp_cfg.timewait_time = 100000; /* 10s */
1589 tcp_cfg.finwait1_time = 600000; /* 60s */
1590 tcp_cfg.lastack_time = 300000; /* 30s */
1591 tcp_cfg.finwait2_time = 300000; /* 30s */
1592 tcp_cfg.closing_time = 300000; /* 30s */
1594 /* This value is seconds */
1595 tcp_cfg.cleanup_time = 0.1; /* 100ms */
1598 static clib_error_t *
1599 tcp_init (vlib_main_t * vm)
1601 tcp_main_t *tm = vnet_get_tcp_main ();
1602 ip_main_t *im = &ip_main;
1603 ip_protocol_info_t *pi;
1605 /* Session layer, and by implication tcp, are disabled by default */
1608 /* Register with IP for header parsing */
1609 pi = ip_get_protocol_info (im, IP_PROTOCOL_TCP);
1611 return clib_error_return (0, "TCP protocol info AWOL");
1612 pi->format_header = format_tcp_header;
1613 pi->unformat_pg_edit = unformat_pg_tcp_header;
1615 /* Register as transport with session layer */
1616 transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto,
1617 FIB_PROTOCOL_IP4, tcp4_output_node.index);
1618 transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto,
1619 FIB_PROTOCOL_IP6, tcp6_output_node.index);
1621 tcp_configuration_init ();
1623 tm->cc_algo_by_name = hash_create_string (0, sizeof (uword));
1628 VLIB_INIT_FUNCTION (tcp_init);
1631 * fd.io coding-style-patch-verification: ON
1634 * eval: (c-set-style "gnu")