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;
184 static tcp_connection_t *
185 tcp_half_open_connection_alloc (void)
187 ASSERT (vlib_get_thread_index () == 0);
188 return tcp_connection_alloc (0);
192 * Cleanup half-open connection
196 tcp_half_open_connection_free (tcp_connection_t * tc)
198 ASSERT (vlib_get_thread_index () == 0);
199 return tcp_connection_free (tc);
203 * Try to cleanup half-open connection
205 * If called from a thread that doesn't own tc, the call won't have any
208 * @param tc - connection to be cleaned up
209 * @return non-zero if cleanup failed.
212 tcp_half_open_connection_cleanup (tcp_connection_t * tc)
214 tcp_worker_ctx_t *wrk;
216 /* Make sure this is the owning thread */
217 if (tc->c_thread_index != vlib_get_thread_index ())
220 session_half_open_delete_notify (&tc->connection);
221 wrk = tcp_get_worker (tc->c_thread_index);
222 tcp_timer_reset (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN);
223 tcp_half_open_connection_free (tc);
228 * Cleans up connection state.
233 tcp_connection_cleanup (tcp_connection_t * tc)
235 TCP_EVT (TCP_EVT_DELETE, tc);
237 /* Cleanup local endpoint if this was an active connect */
238 if (!(tc->cfg_flags & TCP_CFG_F_NO_ENDPOINT))
239 transport_endpoint_cleanup (TRANSPORT_PROTO_TCP, &tc->c_lcl_ip,
242 /* Check if connection is not yet fully established */
243 if (tc->state == TCP_STATE_SYN_SENT)
245 /* Try to remove the half-open connection. If this is not the owning
246 * thread, tc won't be removed. Retransmit or establish timers will
247 * eventually expire and call again cleanup on the right thread. */
248 if (tcp_half_open_connection_cleanup (tc))
249 tc->flags |= TCP_CONN_HALF_OPEN_DONE;
253 /* Make sure all timers are cleared */
254 tcp_connection_timers_reset (tc);
256 if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
257 tcp_add_del_adjacency (tc, 0);
260 vec_free (tc->snd_sacks);
261 vec_free (tc->snd_sacks_fl);
262 vec_free (tc->rcv_opts.sacks);
263 pool_free (tc->sack_sb.holes);
265 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
268 tcp_connection_free (tc);
273 * Connection removal.
275 * This should be called only once connection enters CLOSED state. Note
276 * that it notifies the session of the removal event, so if the goal is to
277 * just remove the connection, call tcp_connection_cleanup instead.
280 tcp_connection_del (tcp_connection_t * tc)
282 session_transport_delete_notify (&tc->connection);
283 tcp_connection_cleanup (tc);
287 tcp_connection_alloc (u8 thread_index)
289 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
290 tcp_connection_t *tc;
292 pool_get (wrk->connections, tc);
293 clib_memset (tc, 0, sizeof (*tc));
294 tc->c_c_index = tc - wrk->connections;
295 tc->c_thread_index = thread_index;
300 tcp_connection_alloc_w_base (u8 thread_index, tcp_connection_t **base)
302 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
303 tcp_connection_t *tc;
305 /* Make sure connection is still valid if pool moves */
306 if ((*base)->c_thread_index == thread_index)
308 u32 base_index = (*base)->c_c_index;
309 pool_get (wrk->connections, tc);
310 *base = tcp_connection_get (base_index, thread_index);
314 pool_get (wrk->connections, tc);
316 clib_memcpy_fast (tc, *base, sizeof (*tc));
317 tc->c_c_index = tc - wrk->connections;
318 tc->c_thread_index = thread_index;
323 tcp_connection_free (tcp_connection_t * tc)
325 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
328 clib_memset (tc, 0xFA, sizeof (*tc));
329 pool_put (wrk->connections, tc);
332 pool_put (wrk->connections, tc);
336 tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
338 tcp_cleanup_req_t *req;
339 clib_time_type_t now;
341 now = tcp_time_now_us (tc->c_thread_index);
342 clib_fifo_add2 (wrk->pending_cleanups, req);
343 req->connection_index = tc->c_c_index;
344 req->free_time = now + tcp_cfg.cleanup_time;
348 * Begin connection closing procedure.
350 * If at the end the connection is not in CLOSED state, it is not removed.
351 * Instead, we rely on on TCP to advance through state machine to either
352 * 1) LAST_ACK (passive close) whereby when the last ACK is received
353 * tcp_connection_del is called. This notifies session of the delete and
355 * 2) TIME_WAIT (active close) whereby after 2MSL the 2MSL timer triggers
356 * and cleanup is called.
360 tcp_connection_close (tcp_connection_t * tc)
362 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
364 TCP_EVT (TCP_EVT_CLOSE, tc);
366 /* Send/Program FIN if needed and switch state */
369 case TCP_STATE_SYN_SENT:
370 /* Try to cleanup. If not on the right thread, mark as half-open done.
371 * Connection will be cleaned up when establish timer pops */
372 tcp_connection_cleanup (tc);
374 case TCP_STATE_SYN_RCVD:
375 tcp_connection_timers_reset (tc);
377 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
378 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
379 tcp_cfg.finwait1_time);
381 case TCP_STATE_ESTABLISHED:
382 /* If closing with unread data, reset the connection */
383 if (transport_max_rx_dequeue (&tc->connection))
386 tcp_connection_timers_reset (tc);
387 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
388 session_transport_closed_notify (&tc->connection);
389 tcp_program_cleanup (tcp_get_worker (tc->c_thread_index), tc);
390 tcp_worker_stats_inc (wrk, rst_unread, 1);
393 if (!transport_max_tx_dequeue (&tc->connection))
396 tc->flags |= TCP_CONN_FINPNDG;
397 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
398 /* Set a timer in case the peer stops responding. Otherwise the
399 * connection will be stuck here forever. */
400 ASSERT (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID);
401 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
402 tcp_cfg.finwait1_time);
404 case TCP_STATE_CLOSE_WAIT:
405 if (!transport_max_tx_dequeue (&tc->connection))
408 tcp_connection_timers_reset (tc);
409 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
410 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
411 tcp_cfg.lastack_time);
414 tc->flags |= TCP_CONN_FINPNDG;
416 case TCP_STATE_FIN_WAIT_1:
417 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
418 tcp_cfg.finwait1_time);
420 case TCP_STATE_CLOSED:
421 /* Cleanup should've been programmed already */
424 TCP_DBG ("state: %u", tc->state);
429 tcp_session_half_close (u32 conn_index, u32 thread_index)
431 tcp_worker_ctx_t *wrk;
432 tcp_connection_t *tc;
434 tc = tcp_connection_get (conn_index, thread_index);
435 wrk = tcp_get_worker (tc->c_thread_index);
437 /* If the connection is not in ESTABLISHED state, ignore it */
438 if (tc->state != TCP_STATE_ESTABLISHED)
440 if (!transport_max_tx_dequeue (&tc->connection))
443 tc->flags |= TCP_CONN_FINPNDG;
444 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
445 /* Set a timer in case the peer stops responding. Otherwise the
446 * connection will be stuck here forever. */
447 ASSERT (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID);
448 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
449 tcp_cfg.finwait1_time);
453 tcp_session_close (u32 conn_index, u32 thread_index)
455 tcp_connection_t *tc;
456 tc = tcp_connection_get (conn_index, thread_index);
457 tcp_connection_close (tc);
461 tcp_session_cleanup (u32 conn_index, u32 thread_index)
463 tcp_connection_t *tc;
464 tc = tcp_connection_get (conn_index, thread_index);
467 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
468 tcp_connection_cleanup (tc);
472 tcp_session_cleanup_ho (u32 conn_index)
474 tcp_worker_ctx_t *wrk;
475 tcp_connection_t *tc;
477 tc = tcp_half_open_connection_get (conn_index);
478 wrk = tcp_get_worker (tc->c_thread_index);
479 tcp_timer_reset (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN);
480 tcp_half_open_connection_free (tc);
484 tcp_session_reset (u32 conn_index, u32 thread_index)
486 tcp_connection_t *tc;
487 tc = tcp_connection_get (conn_index, thread_index);
489 tcp_connection_timers_reset (tc);
490 tcp_cong_recovery_off (tc);
491 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
492 session_transport_closed_notify (&tc->connection);
493 tcp_program_cleanup (tcp_get_worker (thread_index), tc);
497 * Initialize all connection timers as invalid
500 tcp_connection_timers_init (tcp_connection_t * tc)
504 /* Set all to invalid */
505 for (i = 0; i < TCP_N_TIMERS; i++)
507 tc->timers[i] = TCP_TIMER_HANDLE_INVALID;
510 tc->rto = TCP_RTO_INIT;
514 * Stop all connection timers
517 tcp_connection_timers_reset (tcp_connection_t * tc)
519 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
522 for (i = 0; i < TCP_N_TIMERS; i++)
523 tcp_timer_reset (&wrk->timer_wheel, tc, i);
527 typedef struct ip4_tcp_hdr
533 typedef struct ip6_tcp_hdr
540 tcp_connection_select_lb_bucket (tcp_connection_t * tc, const dpo_id_t * dpo,
543 const dpo_id_t *choice;
547 lb = load_balance_get (dpo->dpoi_index);
551 clib_memset (&hdr, 0, sizeof (hdr));
552 hdr.ip.protocol = IP_PROTOCOL_TCP;
553 hdr.ip.address_pair.src.as_u32 = tc->c_lcl_ip.ip4.as_u32;
554 hdr.ip.address_pair.dst.as_u32 = tc->c_rmt_ip.ip4.as_u32;
555 hdr.tcp.src_port = tc->c_lcl_port;
556 hdr.tcp.dst_port = tc->c_rmt_port;
557 hash = ip4_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
562 clib_memset (&hdr, 0, sizeof (hdr));
563 hdr.ip.protocol = IP_PROTOCOL_TCP;
564 clib_memcpy_fast (&hdr.ip.src_address, &tc->c_lcl_ip.ip6,
565 sizeof (ip6_address_t));
566 clib_memcpy_fast (&hdr.ip.dst_address, &tc->c_rmt_ip.ip6,
567 sizeof (ip6_address_t));
568 hdr.tcp.src_port = tc->c_lcl_port;
569 hdr.tcp.dst_port = tc->c_rmt_port;
570 hash = ip6_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
572 choice = load_balance_get_bucket_i (lb, hash & lb->lb_n_buckets_minus_1);
573 dpo_copy (result, choice);
577 tcp_lookup_rmt_in_fib (tcp_connection_t * tc)
582 clib_memcpy_fast (&prefix.fp_addr, &tc->c_rmt_ip, sizeof (prefix.fp_addr));
583 prefix.fp_proto = tc->c_is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
584 prefix.fp_len = tc->c_is_ip4 ? 32 : 128;
585 fib_index = fib_table_find (prefix.fp_proto, tc->c_fib_index);
586 return fib_table_lookup (fib_index, &prefix);
590 tcp_connection_stack_on_fib_entry (tcp_connection_t * tc)
592 dpo_id_t choice = DPO_INVALID;
593 u32 output_node_index;
596 fe = fib_entry_get (tc->c_rmt_fei);
597 if (fe->fe_lb.dpoi_type != DPO_LOAD_BALANCE)
600 tcp_connection_select_lb_bucket (tc, &fe->fe_lb, &choice);
603 tc->c_is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
604 dpo_stack_from_node (output_node_index, &tc->c_rmt_dpo, &choice);
608 /** Stack tcp connection on peer's fib entry.
610 * This ultimately populates the dpo the connection will use to send packets.
613 tcp_connection_fib_attach (tcp_connection_t * tc)
615 tc->c_rmt_fei = tcp_lookup_rmt_in_fib (tc);
617 ASSERT (tc->c_rmt_fei != FIB_NODE_INDEX_INVALID);
619 tcp_connection_stack_on_fib_entry (tc);
624 * Generate random iss as per rfc6528
627 tcp_generate_random_iss (tcp_connection_t * tc)
629 tcp_main_t *tm = &tcp_main;
633 tmp = (u64) tc->c_lcl_ip.ip4.as_u32 << 32 | (u64) tc->c_rmt_ip.ip4.as_u32;
635 tmp = tc->c_lcl_ip.ip6.as_u64[0] ^ tc->c_lcl_ip.ip6.as_u64[1]
636 ^ tc->c_rmt_ip.ip6.as_u64[0] ^ tc->c_rmt_ip.ip6.as_u64[1];
638 tmp ^= tm->iss_seed.first | ((u64) tc->c_lcl_port << 16 | tc->c_rmt_port);
639 tmp ^= tm->iss_seed.second;
640 tmp = clib_xxhash (tmp) + clib_cpu_time_now ();
641 return ((tmp >> 32) ^ (tmp & 0xffffffff));
645 * Initialize max segment size we're able to process.
647 * The value is constrained by the output interface's MTU and by the size
648 * of the IP and TCP headers (see RFC6691). It is also what we advertise
652 tcp_init_rcv_mss (tcp_connection_t * tc)
656 /* Already provided at connection init time */
660 ip_hdr_len = tc->c_is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
661 tc->mss = tcp_cfg.default_mtu - sizeof (tcp_header_t) - ip_hdr_len;
665 tcp_init_mss (tcp_connection_t * tc)
667 u16 default_min_mss = 536;
669 tcp_init_rcv_mss (tc);
671 /* TODO consider PMTU discovery */
672 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
674 if (tc->snd_mss < 45)
676 /* Assume that at least the min default mss works */
677 tc->snd_mss = default_min_mss;
678 tc->rcv_opts.mss = default_min_mss;
681 /* We should have enough space for 40 bytes of options */
682 ASSERT (tc->snd_mss > 45);
684 /* If we use timestamp option, account for it and make sure
685 * the options are 4-byte aligned */
686 if (tcp_opts_tstamp (&tc->rcv_opts))
687 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP + 2 /* alignment */;
691 * Initialize connection send variables.
694 tcp_init_snd_vars (tcp_connection_t * tc)
697 * We use the time to randomize iss and for setting up the initial
698 * timestamp. Make sure it's updated otherwise syn and ack in the
699 * handshake may make it look as if time has flown in the opposite
702 tcp_update_time_now (tcp_get_worker (vlib_get_thread_index ()));
704 tcp_init_rcv_mss (tc);
706 * In special case of early-kill of timewait socket, the iss will already
707 * be initialized to ensure it is greater than the last incarnation of the
708 * connection. see syn_during_timewait() for more details.
711 tc->iss = tcp_generate_random_iss (tc);
712 tc->snd_una = tc->iss;
713 tc->snd_nxt = tc->iss + 1;
714 tc->srtt = 0.1 * THZ; /* 100 ms */
716 if (!tcp_cfg.csum_offload)
717 tc->cfg_flags |= TCP_CFG_F_NO_CSUM_OFFLOAD;
721 tcp_enable_pacing (tcp_connection_t * tc)
724 byte_rate = tc->cwnd / (tc->srtt * TCP_TICK);
725 transport_connection_tx_pacer_init (&tc->connection, byte_rate, tc->cwnd);
726 tc->mrtt_us = (u32) ~ 0;
729 /** Initialize tcp connection variables
731 * Should be called after having received a msg from the peer, i.e., a SYN or
732 * a SYNACK, such that connection options have already been exchanged. */
734 tcp_connection_init_vars (tcp_connection_t * tc)
736 tcp_connection_timers_init (tc);
738 scoreboard_init (&tc->sack_sb);
739 if (tc->state == TCP_STATE_SYN_RCVD)
740 tcp_init_snd_vars (tc);
744 if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
745 tcp_add_del_adjacency (tc, 1);
747 /* tcp_connection_fib_attach (tc); */
749 if (transport_connection_is_tx_paced (&tc->connection)
750 || tcp_cfg.enable_tx_pacing)
751 tcp_enable_pacing (tc);
753 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
756 if (!tcp_cfg.allow_tso)
757 tc->cfg_flags |= TCP_CFG_F_NO_TSO;
759 tc->start_ts = tcp_time_now_us (tc->c_thread_index);
763 tcp_alloc_custom_local_endpoint (tcp_main_t * tm, ip46_address_t * lcl_addr,
764 u16 * lcl_port, u8 is_ip4)
769 index = tm->last_v4_addr_rotor++;
770 if (tm->last_v4_addr_rotor >= vec_len (tcp_cfg.ip4_src_addrs))
771 tm->last_v4_addr_rotor = 0;
772 lcl_addr->ip4.as_u32 = tcp_cfg.ip4_src_addrs[index].as_u32;
776 index = tm->last_v6_addr_rotor++;
777 if (tm->last_v6_addr_rotor >= vec_len (tcp_cfg.ip6_src_addrs))
778 tm->last_v6_addr_rotor = 0;
779 clib_memcpy_fast (&lcl_addr->ip6, &tcp_cfg.ip6_src_addrs[index],
780 sizeof (ip6_address_t));
782 port = transport_alloc_local_port (TRANSPORT_PROTO_TCP, lcl_addr);
784 return SESSION_E_NOPORT;
790 tcp_session_open (transport_endpoint_cfg_t * rmt)
792 tcp_main_t *tm = vnet_get_tcp_main ();
793 tcp_connection_t *tc;
794 ip46_address_t lcl_addr;
799 * Allocate local endpoint
801 if ((rmt->is_ip4 && vec_len (tcp_cfg.ip4_src_addrs))
802 || (!rmt->is_ip4 && vec_len (tcp_cfg.ip6_src_addrs)))
803 rv = tcp_alloc_custom_local_endpoint (tm, &lcl_addr, &lcl_port,
806 rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_TCP,
807 rmt, &lcl_addr, &lcl_port);
811 if (rv != SESSION_E_PORTINUSE)
814 if (session_lookup_connection (rmt->fib_index, &lcl_addr, &rmt->ip,
815 lcl_port, rmt->port, TRANSPORT_PROTO_TCP,
817 return SESSION_E_PORTINUSE;
819 /* 5-tuple is available so increase lcl endpoint refcount and proceed
820 * with connection allocation */
821 transport_share_local_endpoint (TRANSPORT_PROTO_TCP, &lcl_addr,
826 * Create connection and send SYN
828 tc = tcp_half_open_connection_alloc ();
829 ip_copy (&tc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
830 ip_copy (&tc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
831 tc->c_rmt_port = rmt->port;
832 tc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
833 tc->c_is_ip4 = rmt->is_ip4;
834 tc->c_proto = TRANSPORT_PROTO_TCP;
835 tc->c_fib_index = rmt->fib_index;
836 tc->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo);
837 /* The other connection vars will be initialized after SYN ACK */
838 tcp_connection_timers_init (tc);
840 if (rmt->peer.sw_if_index != ENDPOINT_INVALID_INDEX)
841 tc->sw_if_index = rmt->peer.sw_if_index;
842 tc->next_node_index = rmt->next_node_index;
843 tc->next_node_opaque = rmt->next_node_opaque;
845 TCP_EVT (TCP_EVT_OPEN, tc);
846 tc->state = TCP_STATE_SYN_SENT;
847 tcp_init_snd_vars (tc);
850 return tc->c_c_index;
854 format_tcp_session (u8 * s, va_list * args)
856 u32 tci = va_arg (*args, u32);
857 u32 thread_index = va_arg (*args, u32);
858 u32 verbose = va_arg (*args, u32);
859 tcp_connection_t *tc;
861 tc = tcp_connection_get (tci, thread_index);
863 s = format (s, "%U", format_tcp_connection, tc, verbose);
865 s = format (s, "empty\n");
870 format_tcp_listener_session (u8 * s, va_list * args)
872 u32 tci = va_arg (*args, u32);
873 u32 __clib_unused thread_index = va_arg (*args, u32);
874 u32 verbose = va_arg (*args, u32);
875 tcp_connection_t *tc = tcp_listener_get (tci);
876 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_tcp_connection_id, tc);
878 s = format (s, "%-" SESSION_CLI_STATE_LEN "U", format_tcp_state,
884 format_tcp_half_open_session (u8 * s, va_list * args)
886 u32 tci = va_arg (*args, u32);
887 u32 __clib_unused thread_index = va_arg (*args, u32);
888 u32 verbose = va_arg (*args, u32);
889 tcp_connection_t *tc;
892 tc = tcp_half_open_connection_get (tci);
893 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
894 state = format (state, "%s", "CLOSED");
896 state = format (state, "%U", format_tcp_state, tc->state);
897 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_tcp_connection_id, tc);
899 s = format (s, "%-" SESSION_CLI_STATE_LEN "v", state);
904 static transport_connection_t *
905 tcp_session_get_transport (u32 conn_index, u32 thread_index)
907 tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index);
908 if (PREDICT_FALSE (!tc))
910 return &tc->connection;
913 static transport_connection_t *
914 tcp_half_open_session_get_transport (u32 conn_index)
916 tcp_connection_t *tc = tcp_half_open_connection_get (conn_index);
917 return &tc->connection;
921 tcp_set_attribute (tcp_connection_t *tc, transport_endpt_attr_t *attr)
927 case TRANSPORT_ENDPT_ATTR_NEXT_OUTPUT_NODE:
928 tc->next_node_index = attr->next_output_node & 0xffffffff;
929 tc->next_node_opaque = attr->next_output_node >> 32;
931 case TRANSPORT_ENDPT_ATTR_MSS:
933 tc->snd_mss = clib_min (tc->snd_mss, tc->mss);
935 case TRANSPORT_ENDPT_ATTR_FLAGS:
936 if (attr->flags & TRANSPORT_ENDPT_ATTR_F_CSUM_OFFLOAD)
937 tc->cfg_flags |= TCP_CFG_F_NO_CSUM_OFFLOAD;
939 tc->cfg_flags &= ~TCP_CFG_F_NO_CSUM_OFFLOAD;
940 if (attr->flags & TRANSPORT_ENDPT_ATTR_F_GSO)
942 if (!(tc->cfg_flags & TCP_CFG_F_TSO))
944 tc->cfg_flags &= ~TCP_CFG_F_NO_TSO;
948 tc->cfg_flags |= TCP_CFG_F_NO_TSO;
949 tc->cfg_flags &= ~TCP_CFG_F_TSO;
951 if (attr->flags & TRANSPORT_ENDPT_ATTR_F_RATE_SAMPLING)
953 if (!(tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE))
955 tc->cfg_flags |= TCP_CFG_F_RATE_SAMPLE;
959 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
961 tc->cfg_flags &= ~TCP_CFG_F_RATE_SAMPLE;
964 case TRANSPORT_ENDPT_ATTR_CC_ALGO:
965 if (tc->cc_algo == tcp_cc_algo_get (attr->cc_algo))
968 tc->cc_algo = tcp_cc_algo_get (attr->cc_algo);
980 tcp_get_attribute (tcp_connection_t *tc, transport_endpt_attr_t *attr)
987 case TRANSPORT_ENDPT_ATTR_NEXT_OUTPUT_NODE:
988 non = (u64) tc->next_node_opaque << 32 | tc->next_node_index;
989 attr->next_output_node = non;
991 case TRANSPORT_ENDPT_ATTR_MSS:
992 attr->mss = tc->snd_mss;
994 case TRANSPORT_ENDPT_ATTR_FLAGS:
996 if (!(tc->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD))
997 attr->flags |= TRANSPORT_ENDPT_ATTR_F_CSUM_OFFLOAD;
998 if (tc->cfg_flags & TCP_CFG_F_TSO)
999 attr->flags |= TRANSPORT_ENDPT_ATTR_F_GSO;
1000 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
1001 attr->flags |= TRANSPORT_ENDPT_ATTR_F_RATE_SAMPLING;
1003 case TRANSPORT_ENDPT_ATTR_CC_ALGO:
1004 attr->cc_algo = tc->cc_algo - tcp_main.cc_algos;
1015 tcp_session_attribute (u32 conn_index, u32 thread_index, u8 is_get,
1016 transport_endpt_attr_t *attr)
1018 tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index);
1020 if (PREDICT_FALSE (!tc))
1024 return tcp_get_attribute (tc, attr);
1026 return tcp_set_attribute (tc, attr);
1030 tcp_session_cal_goal_size (tcp_connection_t * tc)
1032 u16 goal_size = tc->snd_mss;
1034 goal_size = tcp_cfg.max_gso_size - tc->snd_mss % tcp_cfg.max_gso_size;
1035 goal_size = clib_min (goal_size, tc->snd_wnd / 2);
1037 return goal_size > tc->snd_mss ? goal_size : tc->snd_mss;
1041 tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space)
1043 if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
1045 return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0;
1048 /* If not snd_wnd constrained and we can't write at least a segment,
1049 * don't try at all */
1050 if (PREDICT_FALSE (snd_space < tc->snd_mss))
1051 return snd_space < tc->cwnd ? 0 : snd_space;
1053 /* round down to mss multiple */
1054 return snd_space - (snd_space % tc->snd_mss);
1058 * Compute tx window session is allowed to fill.
1060 * Takes into account available send space, snd_mss and the congestion
1061 * state of the connection. If possible, the value returned is a multiple
1064 * @param tc tcp connection
1065 * @return number of bytes session is allowed to write
1068 tcp_snd_space_inline (tcp_connection_t * tc)
1072 /* Fast path is disabled when recovery is on. @ref tcp_session_custom_tx
1073 * controls both retransmits and the sending of new data while congested
1075 if (PREDICT_FALSE (tcp_in_cong_recovery (tc)
1076 || tc->state == TCP_STATE_CLOSED))
1079 snd_space = tcp_available_output_snd_space (tc);
1081 /* If we got dupacks or sacked bytes but we're not yet in recovery, try
1082 * to force the peer to send enough dupacks to start retransmitting as
1083 * per Limited Transmit (RFC3042)
1085 if (PREDICT_FALSE (tc->rcv_dupacks || tc->sack_sb.sacked_bytes))
1087 int snt_limited, n_pkts;
1089 n_pkts = tcp_opts_sack_permitted (&tc->rcv_opts)
1090 ? tc->sack_sb.reorder - 1 : 2;
1092 if ((seq_lt (tc->limited_transmit, tc->snd_nxt - n_pkts * tc->snd_mss)
1093 || seq_gt (tc->limited_transmit, tc->snd_nxt)))
1094 tc->limited_transmit = tc->snd_nxt;
1096 ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt));
1098 snt_limited = tc->snd_nxt - tc->limited_transmit;
1099 snd_space = clib_max (n_pkts * tc->snd_mss - snt_limited, 0);
1101 return tcp_round_snd_space (tc, snd_space);
1105 tcp_snd_space (tcp_connection_t * tc)
1107 return tcp_snd_space_inline (tc);
1111 tcp_session_send_params (transport_connection_t * trans_conn,
1112 transport_send_params_t * sp)
1114 tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1116 /* Ensure snd_mss does accurately reflect the amount of data we can push
1117 * in a segment. This also makes sure that options are updated according to
1118 * the current state of the connection. */
1119 tcp_update_burst_snd_vars (tc);
1121 if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_TSO))
1122 sp->snd_mss = tcp_session_cal_goal_size (tc);
1124 sp->snd_mss = tc->snd_mss;
1126 sp->snd_space = clib_min (tcp_snd_space_inline (tc),
1127 tc->snd_wnd - (tc->snd_nxt - tc->snd_una));
1129 ASSERT (seq_geq (tc->snd_nxt, tc->snd_una));
1130 /* This still works if fast retransmit is on */
1131 sp->tx_offset = tc->snd_nxt - tc->snd_una;
1133 sp->flags = sp->snd_space ? 0 : TRANSPORT_SND_F_DESCHED;
1139 tcp_timer_waitclose_handler (tcp_connection_t * tc)
1141 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1145 case TCP_STATE_CLOSE_WAIT:
1146 tcp_connection_timers_reset (tc);
1147 /* App never returned with a close */
1148 if (!(tc->flags & TCP_CONN_FINPNDG))
1150 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1151 session_transport_closed_notify (&tc->connection);
1152 tcp_program_cleanup (wrk, tc);
1153 tcp_worker_stats_inc (wrk, to_closewait, 1);
1157 /* Send FIN either way and switch to LAST_ACK. */
1158 tcp_cong_recovery_off (tc);
1159 /* Make sure we don't try to send unsent data */
1160 tc->snd_nxt = tc->snd_una;
1162 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
1163 session_transport_closed_notify (&tc->connection);
1165 /* Make sure we don't wait in LAST ACK forever */
1166 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
1167 tcp_cfg.lastack_time);
1168 tcp_worker_stats_inc (wrk, to_closewait2, 1);
1170 /* Don't delete the connection yet */
1172 case TCP_STATE_FIN_WAIT_1:
1173 tcp_connection_timers_reset (tc);
1174 if (tc->flags & TCP_CONN_FINPNDG)
1176 /* If FIN pending, we haven't sent everything, but we did try.
1177 * Notify session layer that transport is closed. */
1178 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1179 tcp_send_reset (tc);
1180 tcp_program_cleanup (wrk, tc);
1184 /* We've sent the fin but no progress. Close the connection and
1185 * to make sure everything is flushed, setup a cleanup timer */
1186 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1187 tcp_program_cleanup (wrk, tc);
1189 session_transport_closed_notify (&tc->connection);
1190 tcp_worker_stats_inc (wrk, to_finwait1, 1);
1192 case TCP_STATE_LAST_ACK:
1193 tcp_connection_timers_reset (tc);
1194 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1195 session_transport_closed_notify (&tc->connection);
1196 tcp_program_cleanup (wrk, tc);
1197 tcp_worker_stats_inc (wrk, to_lastack, 1);
1199 case TCP_STATE_CLOSING:
1200 tcp_connection_timers_reset (tc);
1201 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1202 session_transport_closed_notify (&tc->connection);
1203 tcp_program_cleanup (wrk, tc);
1204 tcp_worker_stats_inc (wrk, to_closing, 1);
1206 case TCP_STATE_FIN_WAIT_2:
1207 tcp_send_reset (tc);
1208 tcp_connection_timers_reset (tc);
1209 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1210 session_transport_closed_notify (&tc->connection);
1211 tcp_program_cleanup (wrk, tc);
1212 tcp_worker_stats_inc (wrk, to_finwait2, 1);
1214 case TCP_STATE_TIME_WAIT:
1215 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1216 tcp_program_cleanup (wrk, tc);
1219 clib_warning ("waitclose in state: %U", format_tcp_state, tc->state);
1225 static timer_expiration_handler *timer_expiration_handlers[TCP_N_TIMERS] =
1227 tcp_timer_retransmit_handler,
1228 tcp_timer_persist_handler,
1229 tcp_timer_waitclose_handler,
1230 tcp_timer_retransmit_syn_handler,
1235 tcp_dispatch_pending_timers (tcp_worker_ctx_t * wrk)
1237 u32 n_timers, connection_index, timer_id, thread_index, timer_handle;
1238 tcp_connection_t *tc;
1241 if (!(n_timers = clib_fifo_elts (wrk->pending_timers)))
1244 thread_index = wrk->vm->thread_index;
1245 for (i = 0; i < clib_min (n_timers, wrk->max_timers_per_loop); i++)
1247 clib_fifo_sub1 (wrk->pending_timers, timer_handle);
1248 connection_index = timer_handle & 0x0FFFFFFF;
1249 timer_id = timer_handle >> 28;
1251 if (PREDICT_TRUE (timer_id != TCP_TIMER_RETRANSMIT_SYN))
1252 tc = tcp_connection_get (connection_index, thread_index);
1254 tc = tcp_half_open_connection_get (connection_index);
1256 if (PREDICT_FALSE (!tc))
1259 /* Skip if the timer is not pending. Probably it was reset while
1260 * waiting for dispatch */
1261 if (PREDICT_FALSE (!(tc->pending_timers & (1 << timer_id))))
1264 tc->pending_timers &= ~(1 << timer_id);
1266 /* Skip timer if it was rearmed while pending dispatch */
1267 if (PREDICT_FALSE (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID))
1270 (*timer_expiration_handlers[timer_id]) (tc);
1273 if (thread_index == 0 && clib_fifo_elts (wrk->pending_timers))
1274 session_queue_run_on_main_thread (wrk->vm);
1278 tcp_handle_cleanups (tcp_worker_ctx_t * wrk, clib_time_type_t now)
1280 u32 thread_index = wrk->vm->thread_index;
1281 tcp_cleanup_req_t *req;
1282 tcp_connection_t *tc;
1284 while (clib_fifo_elts (wrk->pending_cleanups))
1286 req = clib_fifo_head (wrk->pending_cleanups);
1287 if (req->free_time > now)
1289 clib_fifo_sub2 (wrk->pending_cleanups, req);
1290 tc = tcp_connection_get (req->connection_index, thread_index);
1291 if (PREDICT_FALSE (!tc))
1293 session_transport_delete_notify (&tc->connection);
1294 tcp_connection_cleanup (tc);
1299 tcp_update_time (f64 now, u8 thread_index)
1301 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1303 tcp_set_time_now (wrk, now);
1304 tcp_handle_cleanups (wrk, now);
1305 tcp_timer_expire_timers (&wrk->timer_wheel, now);
1306 tcp_dispatch_pending_timers (wrk);
1310 tcp_session_flush_data (transport_connection_t * tconn)
1312 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1313 if (tc->flags & TCP_CONN_PSH_PENDING)
1315 tc->flags |= TCP_CONN_PSH_PENDING;
1316 tc->psh_seq = tc->snd_una + transport_max_tx_dequeue (tconn) - 1;
1320 tcp_session_app_rx_evt (transport_connection_t *conn)
1322 tcp_connection_t *tc = (tcp_connection_t *) conn;
1323 u32 min_free, lo = 4 << 10, hi = 128 << 10;
1325 if (!(tc->flags & TCP_CONN_ZERO_RWND_SENT))
1328 min_free = clib_clamp (transport_rx_fifo_size (conn) >> 3, lo, hi);
1329 if (transport_max_rx_enqueue (conn) < min_free)
1331 transport_rx_fifo_req_deq_ntf (conn);
1341 const static transport_proto_vft_t tcp_proto = {
1342 .enable = vnet_tcp_enable_disable,
1343 .start_listen = tcp_session_bind,
1344 .stop_listen = tcp_session_unbind,
1345 .push_header = tcp_session_push_header,
1346 .get_connection = tcp_session_get_transport,
1347 .get_listener = tcp_session_get_listener,
1348 .get_half_open = tcp_half_open_session_get_transport,
1349 .attribute = tcp_session_attribute,
1350 .connect = tcp_session_open,
1351 .half_close = tcp_session_half_close,
1352 .close = tcp_session_close,
1353 .cleanup = tcp_session_cleanup,
1354 .cleanup_ho = tcp_session_cleanup_ho,
1355 .reset = tcp_session_reset,
1356 .send_params = tcp_session_send_params,
1357 .update_time = tcp_update_time,
1358 .flush_data = tcp_session_flush_data,
1359 .custom_tx = tcp_session_custom_tx,
1360 .app_rx_evt = tcp_session_app_rx_evt,
1361 .format_connection = format_tcp_session,
1362 .format_listener = format_tcp_listener_session,
1363 .format_half_open = format_tcp_half_open_session,
1364 .transport_options = {
1367 .tx_type = TRANSPORT_TX_PEEK,
1368 .service_type = TRANSPORT_SERVICE_VC,
1374 tcp_connection_tx_pacer_update (tcp_connection_t * tc)
1376 if (!transport_connection_is_tx_paced (&tc->connection))
1379 f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
1381 transport_connection_tx_pacer_update (&tc->connection,
1382 tcp_cc_get_pacing_rate (tc),
1383 srtt * CLIB_US_TIME_FREQ);
1387 tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
1390 f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
1391 transport_connection_tx_pacer_reset (&tc->connection,
1392 tcp_cc_get_pacing_rate (tc),
1394 srtt * CLIB_US_TIME_FREQ);
1398 tcp_reschedule (tcp_connection_t * tc)
1400 if (tcp_in_cong_recovery (tc) || tcp_snd_space_inline (tc))
1401 transport_connection_reschedule (&tc->connection);
1405 tcp_expired_timers_dispatch (u32 * expired_timers)
1407 u32 thread_index = vlib_get_thread_index (), n_left, max_per_loop;
1408 u32 connection_index, timer_id, n_expired, max_loops;
1409 tcp_worker_ctx_t *wrk;
1410 tcp_connection_t *tc;
1413 wrk = tcp_get_worker (thread_index);
1414 n_expired = vec_len (expired_timers);
1415 tcp_worker_stats_inc (wrk, timer_expirations, n_expired);
1416 n_left = clib_fifo_elts (wrk->pending_timers);
1419 * Invalidate all timer handles before dispatching. This avoids dangling
1420 * index references to timer wheel pool entries that have been freed.
1422 for (i = 0; i < n_expired; i++)
1424 connection_index = expired_timers[i] & 0x0FFFFFFF;
1425 timer_id = expired_timers[i] >> 28;
1427 if (timer_id != TCP_TIMER_RETRANSMIT_SYN)
1428 tc = tcp_connection_get (connection_index, thread_index);
1430 tc = tcp_half_open_connection_get (connection_index);
1432 TCP_EVT (TCP_EVT_TIMER_POP, connection_index, timer_id);
1434 tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
1435 tc->pending_timers |= (1 << timer_id);
1438 clib_fifo_add (wrk->pending_timers, expired_timers, n_expired);
1440 max_loops = clib_max (1, 0.5 * TCP_TIMER_TICK * wrk->vm->loops_per_second);
1441 max_per_loop = clib_max ((n_left + n_expired) / max_loops, 10);
1442 max_per_loop = clib_min (max_per_loop, VLIB_FRAME_SIZE);
1443 wrk->max_timers_per_loop = clib_max (n_left ? wrk->max_timers_per_loop : 0,
1446 if (thread_index == 0)
1447 session_queue_run_on_main_thread (wrk->vm);
1451 tcp_initialize_iss_seed (tcp_main_t * tm)
1453 u32 default_seed = random_default_seed ();
1454 u64 time_now = clib_cpu_time_now ();
1456 tm->iss_seed.first = (u64) random_u32 (&default_seed) << 32;
1457 tm->iss_seed.second = random_u64 (&time_now);
1460 static clib_error_t *
1461 tcp_main_enable (vlib_main_t * vm)
1463 vlib_thread_main_t *vtm = vlib_get_thread_main ();
1464 u32 num_threads, n_workers, prealloc_conn_per_wrk;
1465 tcp_connection_t *tc __attribute__ ((unused));
1466 tcp_main_t *tm = vnet_get_tcp_main ();
1467 tcp_worker_ctx_t *wrk;
1468 clib_error_t *error = 0;
1471 if ((error = vlib_call_init_function (vm, ip_main_init)))
1473 if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
1475 if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
1482 ip4_register_protocol (IP_PROTOCOL_TCP, tcp4_input_node.index);
1483 ip6_register_protocol (IP_PROTOCOL_TCP, tcp6_input_node.index);
1486 * Initialize data structures
1489 num_threads = 1 /* main thread */ + vtm->n_threads;
1490 vec_validate (tm->wrk_ctx, num_threads - 1);
1491 n_workers = num_threads == 1 ? 1 : vtm->n_threads;
1492 prealloc_conn_per_wrk = tcp_cfg.preallocated_connections / n_workers;
1494 wrk = &tm->wrk_ctx[0];
1495 wrk->tco_next_node[0] = vlib_node_get_next (vm, session_queue_node.index,
1496 tcp4_output_node.index);
1497 wrk->tco_next_node[1] = vlib_node_get_next (vm, session_queue_node.index,
1498 tcp6_output_node.index);
1500 for (thread = 0; thread < num_threads; thread++)
1502 wrk = &tm->wrk_ctx[thread];
1504 vec_validate (wrk->pending_deq_acked, 255);
1505 vec_validate (wrk->pending_disconnects, 255);
1506 vec_validate (wrk->pending_resets, 255);
1507 vec_reset_length (wrk->pending_deq_acked);
1508 vec_reset_length (wrk->pending_disconnects);
1509 vec_reset_length (wrk->pending_resets);
1510 wrk->vm = vlib_get_main_by_index (thread);
1511 wrk->max_timers_per_loop = 10;
1515 wrk->tco_next_node[0] = tm->wrk_ctx[0].tco_next_node[0];
1516 wrk->tco_next_node[1] = tm->wrk_ctx[0].tco_next_node[1];
1520 * Preallocate connections. Assume that thread 0 won't
1521 * use preallocated threads when running multi-core
1523 if ((thread > 0 || num_threads == 1) && prealloc_conn_per_wrk)
1524 pool_init_fixed (wrk->connections, prealloc_conn_per_wrk);
1526 tcp_timer_initialize_wheel (&wrk->timer_wheel,
1527 tcp_expired_timers_dispatch,
1528 vlib_time_now (vm));
1531 tcp_initialize_iss_seed (tm);
1533 tm->bytes_per_buffer = vlib_buffer_get_default_data_size (vm);
1534 tm->cc_last_type = TCP_CC_LAST;
1536 tm->ipl_next_node[0] = vlib_node_get_next (vm, session_queue_node.index,
1537 ip4_lookup_node.index);
1538 tm->ipl_next_node[1] = vlib_node_get_next (vm, session_queue_node.index,
1539 ip6_lookup_node.index);
1544 vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en)
1548 if (tcp_main.is_enabled)
1551 return tcp_main_enable (vm);
1555 tcp_main.is_enabled = 0;
1562 tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add)
1564 tcp_main_t *tm = &tcp_main;
1566 tm->punt_unknown4 = is_add;
1568 tm->punt_unknown6 = is_add;
1572 * Initialize default values for tcp parameters
1575 tcp_configuration_init (void)
1577 /* Initial wnd for SYN. Fifos are not allocated at that point so use some
1578 * predefined value. For SYN-ACK we still want the scale to be computed in
1580 tcp_cfg.max_rx_fifo = 32 << 20;
1581 tcp_cfg.min_rx_fifo = 4 << 10;
1583 tcp_cfg.default_mtu = 1500;
1584 tcp_cfg.initial_cwnd_multiplier = 0;
1585 tcp_cfg.enable_tx_pacing = 1;
1586 tcp_cfg.allow_tso = 0;
1587 tcp_cfg.csum_offload = 1;
1588 tcp_cfg.cc_algo = TCP_CC_CUBIC;
1589 tcp_cfg.rwnd_min_update_ack = 1;
1590 tcp_cfg.max_gso_size = TCP_MAX_GSO_SZ;
1592 /* Time constants defined as timer tick (100us) multiples */
1593 tcp_cfg.closewait_time = 20000; /* 2s */
1594 tcp_cfg.timewait_time = 100000; /* 10s */
1595 tcp_cfg.finwait1_time = 600000; /* 60s */
1596 tcp_cfg.lastack_time = 300000; /* 30s */
1597 tcp_cfg.finwait2_time = 300000; /* 30s */
1598 tcp_cfg.closing_time = 300000; /* 30s */
1599 tcp_cfg.alloc_err_timeout = 1000; /* 100ms */
1601 /* This value is seconds */
1602 tcp_cfg.cleanup_time = 0.1; /* 100ms */
1605 static clib_error_t *
1606 tcp_init (vlib_main_t * vm)
1608 tcp_main_t *tm = vnet_get_tcp_main ();
1609 ip_main_t *im = &ip_main;
1610 ip_protocol_info_t *pi;
1612 /* Session layer, and by implication tcp, are disabled by default */
1615 /* Register with IP for header parsing */
1616 pi = ip_get_protocol_info (im, IP_PROTOCOL_TCP);
1618 return clib_error_return (0, "TCP protocol info AWOL");
1619 pi->format_header = format_tcp_header;
1620 pi->unformat_pg_edit = unformat_pg_tcp_header;
1622 /* Register as transport with session layer */
1623 transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto,
1624 FIB_PROTOCOL_IP4, tcp4_output_node.index);
1625 transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto,
1626 FIB_PROTOCOL_IP6, tcp6_output_node.index);
1628 tcp_configuration_init ();
1630 tm->cc_algo_by_name = hash_create_string (0, sizeof (uword));
1635 VLIB_INIT_FUNCTION (tcp_init);
1638 * fd.io coding-style-patch-verification: ON
1641 * eval: (c-set-style "gnu")