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);
705 tc->iss = tcp_generate_random_iss (tc);
706 tc->snd_una = tc->iss;
707 tc->snd_nxt = tc->iss + 1;
708 tc->srtt = 0.1 * THZ; /* 100 ms */
710 if (!tcp_cfg.csum_offload)
711 tc->cfg_flags |= TCP_CFG_F_NO_CSUM_OFFLOAD;
715 tcp_enable_pacing (tcp_connection_t * tc)
718 byte_rate = tc->cwnd / (tc->srtt * TCP_TICK);
719 transport_connection_tx_pacer_init (&tc->connection, byte_rate, tc->cwnd);
720 tc->mrtt_us = (u32) ~ 0;
723 /** Initialize tcp connection variables
725 * Should be called after having received a msg from the peer, i.e., a SYN or
726 * a SYNACK, such that connection options have already been exchanged. */
728 tcp_connection_init_vars (tcp_connection_t * tc)
730 tcp_connection_timers_init (tc);
732 scoreboard_init (&tc->sack_sb);
733 if (tc->state == TCP_STATE_SYN_RCVD)
734 tcp_init_snd_vars (tc);
738 if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
739 tcp_add_del_adjacency (tc, 1);
741 /* tcp_connection_fib_attach (tc); */
743 if (transport_connection_is_tx_paced (&tc->connection)
744 || tcp_cfg.enable_tx_pacing)
745 tcp_enable_pacing (tc);
747 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
750 if (!tcp_cfg.allow_tso)
751 tc->cfg_flags |= TCP_CFG_F_NO_TSO;
753 tc->start_ts = tcp_time_now_us (tc->c_thread_index);
757 tcp_alloc_custom_local_endpoint (tcp_main_t * tm, ip46_address_t * lcl_addr,
758 u16 * lcl_port, u8 is_ip4)
763 index = tm->last_v4_addr_rotor++;
764 if (tm->last_v4_addr_rotor >= vec_len (tcp_cfg.ip4_src_addrs))
765 tm->last_v4_addr_rotor = 0;
766 lcl_addr->ip4.as_u32 = tcp_cfg.ip4_src_addrs[index].as_u32;
770 index = tm->last_v6_addr_rotor++;
771 if (tm->last_v6_addr_rotor >= vec_len (tcp_cfg.ip6_src_addrs))
772 tm->last_v6_addr_rotor = 0;
773 clib_memcpy_fast (&lcl_addr->ip6, &tcp_cfg.ip6_src_addrs[index],
774 sizeof (ip6_address_t));
776 port = transport_alloc_local_port (TRANSPORT_PROTO_TCP, lcl_addr);
778 return SESSION_E_NOPORT;
784 tcp_session_open (transport_endpoint_cfg_t * rmt)
786 tcp_main_t *tm = vnet_get_tcp_main ();
787 tcp_connection_t *tc;
788 ip46_address_t lcl_addr;
793 * Allocate local endpoint
795 if ((rmt->is_ip4 && vec_len (tcp_cfg.ip4_src_addrs))
796 || (!rmt->is_ip4 && vec_len (tcp_cfg.ip6_src_addrs)))
797 rv = tcp_alloc_custom_local_endpoint (tm, &lcl_addr, &lcl_port,
800 rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_TCP,
801 rmt, &lcl_addr, &lcl_port);
805 if (rv != SESSION_E_PORTINUSE)
808 if (session_lookup_connection (rmt->fib_index, &lcl_addr, &rmt->ip,
809 lcl_port, rmt->port, TRANSPORT_PROTO_TCP,
811 return SESSION_E_PORTINUSE;
813 /* 5-tuple is available so increase lcl endpoint refcount and proceed
814 * with connection allocation */
815 transport_share_local_endpoint (TRANSPORT_PROTO_TCP, &lcl_addr,
820 * Create connection and send SYN
822 tc = tcp_half_open_connection_alloc ();
823 ip_copy (&tc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
824 ip_copy (&tc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
825 tc->c_rmt_port = rmt->port;
826 tc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
827 tc->c_is_ip4 = rmt->is_ip4;
828 tc->c_proto = TRANSPORT_PROTO_TCP;
829 tc->c_fib_index = rmt->fib_index;
830 tc->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo);
831 /* The other connection vars will be initialized after SYN ACK */
832 tcp_connection_timers_init (tc);
835 TCP_EVT (TCP_EVT_OPEN, tc);
836 tc->state = TCP_STATE_SYN_SENT;
837 tcp_init_snd_vars (tc);
840 return tc->c_c_index;
844 format_tcp_session (u8 * s, va_list * args)
846 u32 tci = va_arg (*args, u32);
847 u32 thread_index = va_arg (*args, u32);
848 u32 verbose = va_arg (*args, u32);
849 tcp_connection_t *tc;
851 tc = tcp_connection_get (tci, thread_index);
853 s = format (s, "%U", format_tcp_connection, tc, verbose);
855 s = format (s, "empty\n");
860 format_tcp_listener_session (u8 * s, va_list * args)
862 u32 tci = va_arg (*args, u32);
863 u32 __clib_unused thread_index = va_arg (*args, u32);
864 u32 verbose = va_arg (*args, u32);
865 tcp_connection_t *tc = tcp_listener_get (tci);
866 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_tcp_connection_id, tc);
868 s = format (s, "%-" SESSION_CLI_STATE_LEN "U", format_tcp_state,
874 format_tcp_half_open_session (u8 * s, va_list * args)
876 u32 tci = va_arg (*args, u32);
877 u32 __clib_unused thread_index = va_arg (*args, u32);
878 u32 verbose = va_arg (*args, u32);
879 tcp_connection_t *tc;
882 tc = tcp_half_open_connection_get (tci);
883 if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
884 state = format (state, "%s", "CLOSED");
886 state = format (state, "%U", format_tcp_state, tc->state);
887 s = format (s, "%-" SESSION_CLI_ID_LEN "U", format_tcp_connection_id, tc);
889 s = format (s, "%-" SESSION_CLI_STATE_LEN "v", state);
894 static transport_connection_t *
895 tcp_session_get_transport (u32 conn_index, u32 thread_index)
897 tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index);
898 if (PREDICT_FALSE (!tc))
900 return &tc->connection;
903 static transport_connection_t *
904 tcp_half_open_session_get_transport (u32 conn_index)
906 tcp_connection_t *tc = tcp_half_open_connection_get (conn_index);
907 return &tc->connection;
911 tcp_set_attribute (tcp_connection_t *tc, transport_endpt_attr_t *attr)
917 case TRANSPORT_ENDPT_ATTR_NEXT_OUTPUT_NODE:
918 tc->next_node_index = attr->next_output_node & 0xffffffff;
919 tc->next_node_opaque = attr->next_output_node >> 32;
921 case TRANSPORT_ENDPT_ATTR_MSS:
923 tc->snd_mss = clib_min (tc->snd_mss, tc->mss);
925 case TRANSPORT_ENDPT_ATTR_FLAGS:
926 if (attr->flags & TRANSPORT_ENDPT_ATTR_F_CSUM_OFFLOAD)
927 tc->cfg_flags |= TCP_CFG_F_NO_CSUM_OFFLOAD;
929 tc->cfg_flags &= ~TCP_CFG_F_NO_CSUM_OFFLOAD;
930 if (attr->flags & TRANSPORT_ENDPT_ATTR_F_GSO)
932 if (!(tc->cfg_flags & TCP_CFG_F_TSO))
934 tc->cfg_flags &= ~TCP_CFG_F_NO_TSO;
938 tc->cfg_flags |= TCP_CFG_F_NO_TSO;
939 tc->cfg_flags &= ~TCP_CFG_F_TSO;
941 if (attr->flags & TRANSPORT_ENDPT_ATTR_F_RATE_SAMPLING)
943 if (!(tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE))
945 tc->cfg_flags |= TCP_CFG_F_RATE_SAMPLE;
949 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
951 tc->cfg_flags &= ~TCP_CFG_F_RATE_SAMPLE;
954 case TRANSPORT_ENDPT_ATTR_CC_ALGO:
955 if (tc->cc_algo == tcp_cc_algo_get (attr->cc_algo))
958 tc->cc_algo = tcp_cc_algo_get (attr->cc_algo);
970 tcp_get_attribute (tcp_connection_t *tc, transport_endpt_attr_t *attr)
977 case TRANSPORT_ENDPT_ATTR_NEXT_OUTPUT_NODE:
978 non = (u64) tc->next_node_opaque << 32 | tc->next_node_index;
979 attr->next_output_node = non;
981 case TRANSPORT_ENDPT_ATTR_MSS:
982 attr->mss = tc->snd_mss;
984 case TRANSPORT_ENDPT_ATTR_FLAGS:
986 if (!(tc->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD))
987 attr->flags |= TRANSPORT_ENDPT_ATTR_F_CSUM_OFFLOAD;
988 if (tc->cfg_flags & TCP_CFG_F_TSO)
989 attr->flags |= TRANSPORT_ENDPT_ATTR_F_GSO;
990 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
991 attr->flags |= TRANSPORT_ENDPT_ATTR_F_RATE_SAMPLING;
993 case TRANSPORT_ENDPT_ATTR_CC_ALGO:
994 attr->cc_algo = tc->cc_algo - tcp_main.cc_algos;
1005 tcp_session_attribute (u32 conn_index, u32 thread_index, u8 is_get,
1006 transport_endpt_attr_t *attr)
1008 tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index);
1010 if (PREDICT_FALSE (!tc))
1014 return tcp_get_attribute (tc, attr);
1016 return tcp_set_attribute (tc, attr);
1020 tcp_session_cal_goal_size (tcp_connection_t * tc)
1022 u16 goal_size = tc->snd_mss;
1024 goal_size = tcp_cfg.max_gso_size - tc->snd_mss % tcp_cfg.max_gso_size;
1025 goal_size = clib_min (goal_size, tc->snd_wnd / 2);
1027 return goal_size > tc->snd_mss ? goal_size : tc->snd_mss;
1031 tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space)
1033 if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
1035 return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0;
1038 /* If not snd_wnd constrained and we can't write at least a segment,
1039 * don't try at all */
1040 if (PREDICT_FALSE (snd_space < tc->snd_mss))
1041 return snd_space < tc->cwnd ? 0 : snd_space;
1043 /* round down to mss multiple */
1044 return snd_space - (snd_space % tc->snd_mss);
1048 * Compute tx window session is allowed to fill.
1050 * Takes into account available send space, snd_mss and the congestion
1051 * state of the connection. If possible, the value returned is a multiple
1054 * @param tc tcp connection
1055 * @return number of bytes session is allowed to write
1058 tcp_snd_space_inline (tcp_connection_t * tc)
1062 /* Fast path is disabled when recovery is on. @ref tcp_session_custom_tx
1063 * controls both retransmits and the sending of new data while congested
1065 if (PREDICT_FALSE (tcp_in_cong_recovery (tc)
1066 || tc->state == TCP_STATE_CLOSED))
1069 snd_space = tcp_available_output_snd_space (tc);
1071 /* If we got dupacks or sacked bytes but we're not yet in recovery, try
1072 * to force the peer to send enough dupacks to start retransmitting as
1073 * per Limited Transmit (RFC3042)
1075 if (PREDICT_FALSE (tc->rcv_dupacks || tc->sack_sb.sacked_bytes))
1077 int snt_limited, n_pkts;
1079 n_pkts = tcp_opts_sack_permitted (&tc->rcv_opts)
1080 ? tc->sack_sb.reorder - 1 : 2;
1082 if ((seq_lt (tc->limited_transmit, tc->snd_nxt - n_pkts * tc->snd_mss)
1083 || seq_gt (tc->limited_transmit, tc->snd_nxt)))
1084 tc->limited_transmit = tc->snd_nxt;
1086 ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt));
1088 snt_limited = tc->snd_nxt - tc->limited_transmit;
1089 snd_space = clib_max (n_pkts * tc->snd_mss - snt_limited, 0);
1091 return tcp_round_snd_space (tc, snd_space);
1095 tcp_snd_space (tcp_connection_t * tc)
1097 return tcp_snd_space_inline (tc);
1101 tcp_session_send_params (transport_connection_t * trans_conn,
1102 transport_send_params_t * sp)
1104 tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1106 /* Ensure snd_mss does accurately reflect the amount of data we can push
1107 * in a segment. This also makes sure that options are updated according to
1108 * the current state of the connection. */
1109 tcp_update_burst_snd_vars (tc);
1111 if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_TSO))
1112 sp->snd_mss = tcp_session_cal_goal_size (tc);
1114 sp->snd_mss = tc->snd_mss;
1116 sp->snd_space = clib_min (tcp_snd_space_inline (tc),
1117 tc->snd_wnd - (tc->snd_nxt - tc->snd_una));
1119 ASSERT (seq_geq (tc->snd_nxt, tc->snd_una));
1120 /* This still works if fast retransmit is on */
1121 sp->tx_offset = tc->snd_nxt - tc->snd_una;
1123 sp->flags = sp->snd_space ? 0 : TRANSPORT_SND_F_DESCHED;
1129 tcp_timer_waitclose_handler (tcp_connection_t * tc)
1131 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
1135 case TCP_STATE_CLOSE_WAIT:
1136 tcp_connection_timers_reset (tc);
1137 /* App never returned with a close */
1138 if (!(tc->flags & TCP_CONN_FINPNDG))
1140 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1141 session_transport_closed_notify (&tc->connection);
1142 tcp_program_cleanup (wrk, tc);
1143 tcp_worker_stats_inc (wrk, to_closewait, 1);
1147 /* Send FIN either way and switch to LAST_ACK. */
1148 tcp_cong_recovery_off (tc);
1149 /* Make sure we don't try to send unsent data */
1150 tc->snd_nxt = tc->snd_una;
1152 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
1153 session_transport_closed_notify (&tc->connection);
1155 /* Make sure we don't wait in LAST ACK forever */
1156 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
1157 tcp_cfg.lastack_time);
1158 tcp_worker_stats_inc (wrk, to_closewait2, 1);
1160 /* Don't delete the connection yet */
1162 case TCP_STATE_FIN_WAIT_1:
1163 tcp_connection_timers_reset (tc);
1164 if (tc->flags & TCP_CONN_FINPNDG)
1166 /* If FIN pending, we haven't sent everything, but we did try.
1167 * Notify session layer that transport is closed. */
1168 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1169 tcp_send_reset (tc);
1170 tcp_program_cleanup (wrk, tc);
1174 /* We've sent the fin but no progress. Close the connection and
1175 * to make sure everything is flushed, setup a cleanup timer */
1176 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1177 tcp_program_cleanup (wrk, tc);
1179 session_transport_closed_notify (&tc->connection);
1180 tcp_worker_stats_inc (wrk, to_finwait1, 1);
1182 case TCP_STATE_LAST_ACK:
1183 tcp_connection_timers_reset (tc);
1184 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1185 session_transport_closed_notify (&tc->connection);
1186 tcp_program_cleanup (wrk, tc);
1187 tcp_worker_stats_inc (wrk, to_lastack, 1);
1189 case TCP_STATE_CLOSING:
1190 tcp_connection_timers_reset (tc);
1191 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1192 session_transport_closed_notify (&tc->connection);
1193 tcp_program_cleanup (wrk, tc);
1194 tcp_worker_stats_inc (wrk, to_closing, 1);
1196 case TCP_STATE_FIN_WAIT_2:
1197 tcp_send_reset (tc);
1198 tcp_connection_timers_reset (tc);
1199 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1200 session_transport_closed_notify (&tc->connection);
1201 tcp_program_cleanup (wrk, tc);
1202 tcp_worker_stats_inc (wrk, to_finwait2, 1);
1204 case TCP_STATE_TIME_WAIT:
1205 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1206 tcp_program_cleanup (wrk, tc);
1209 clib_warning ("waitclose in state: %U", format_tcp_state, tc->state);
1215 static timer_expiration_handler *timer_expiration_handlers[TCP_N_TIMERS] =
1217 tcp_timer_retransmit_handler,
1218 tcp_timer_persist_handler,
1219 tcp_timer_waitclose_handler,
1220 tcp_timer_retransmit_syn_handler,
1225 tcp_dispatch_pending_timers (tcp_worker_ctx_t * wrk)
1227 u32 n_timers, connection_index, timer_id, thread_index, timer_handle;
1228 tcp_connection_t *tc;
1231 if (!(n_timers = clib_fifo_elts (wrk->pending_timers)))
1234 thread_index = wrk->vm->thread_index;
1235 for (i = 0; i < clib_min (n_timers, wrk->max_timers_per_loop); i++)
1237 clib_fifo_sub1 (wrk->pending_timers, timer_handle);
1238 connection_index = timer_handle & 0x0FFFFFFF;
1239 timer_id = timer_handle >> 28;
1241 if (PREDICT_TRUE (timer_id != TCP_TIMER_RETRANSMIT_SYN))
1242 tc = tcp_connection_get (connection_index, thread_index);
1244 tc = tcp_half_open_connection_get (connection_index);
1246 if (PREDICT_FALSE (!tc))
1249 /* Skip if the timer is not pending. Probably it was reset while
1250 * waiting for dispatch */
1251 if (PREDICT_FALSE (!(tc->pending_timers & (1 << timer_id))))
1254 tc->pending_timers &= ~(1 << timer_id);
1256 /* Skip timer if it was rearmed while pending dispatch */
1257 if (PREDICT_FALSE (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID))
1260 (*timer_expiration_handlers[timer_id]) (tc);
1263 if (thread_index == 0 && clib_fifo_elts (wrk->pending_timers))
1264 session_queue_run_on_main_thread (wrk->vm);
1268 tcp_handle_cleanups (tcp_worker_ctx_t * wrk, clib_time_type_t now)
1270 u32 thread_index = wrk->vm->thread_index;
1271 tcp_cleanup_req_t *req;
1272 tcp_connection_t *tc;
1274 while (clib_fifo_elts (wrk->pending_cleanups))
1276 req = clib_fifo_head (wrk->pending_cleanups);
1277 if (req->free_time > now)
1279 clib_fifo_sub2 (wrk->pending_cleanups, req);
1280 tc = tcp_connection_get (req->connection_index, thread_index);
1281 if (PREDICT_FALSE (!tc))
1283 session_transport_delete_notify (&tc->connection);
1284 tcp_connection_cleanup (tc);
1289 tcp_update_time (f64 now, u8 thread_index)
1291 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1293 tcp_set_time_now (wrk, now);
1294 tcp_handle_cleanups (wrk, now);
1295 tcp_timer_expire_timers (&wrk->timer_wheel, now);
1296 tcp_dispatch_pending_timers (wrk);
1300 tcp_session_flush_data (transport_connection_t * tconn)
1302 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1303 if (tc->flags & TCP_CONN_PSH_PENDING)
1305 tc->flags |= TCP_CONN_PSH_PENDING;
1306 tc->psh_seq = tc->snd_una + transport_max_tx_dequeue (tconn) - 1;
1310 tcp_session_app_rx_evt (transport_connection_t *conn)
1312 tcp_connection_t *tc = (tcp_connection_t *) conn;
1313 u32 min_free, lo = 4 << 10, hi = 128 << 10;
1315 if (!(tc->flags & TCP_CONN_ZERO_RWND_SENT))
1318 min_free = clib_clamp (transport_rx_fifo_size (conn) >> 3, lo, hi);
1319 if (transport_max_rx_enqueue (conn) < min_free)
1321 transport_rx_fifo_req_deq_ntf (conn);
1331 const static transport_proto_vft_t tcp_proto = {
1332 .enable = vnet_tcp_enable_disable,
1333 .start_listen = tcp_session_bind,
1334 .stop_listen = tcp_session_unbind,
1335 .push_header = tcp_session_push_header,
1336 .get_connection = tcp_session_get_transport,
1337 .get_listener = tcp_session_get_listener,
1338 .get_half_open = tcp_half_open_session_get_transport,
1339 .attribute = tcp_session_attribute,
1340 .connect = tcp_session_open,
1341 .half_close = tcp_session_half_close,
1342 .close = tcp_session_close,
1343 .cleanup = tcp_session_cleanup,
1344 .cleanup_ho = tcp_session_cleanup_ho,
1345 .reset = tcp_session_reset,
1346 .send_params = tcp_session_send_params,
1347 .update_time = tcp_update_time,
1348 .flush_data = tcp_session_flush_data,
1349 .custom_tx = tcp_session_custom_tx,
1350 .app_rx_evt = tcp_session_app_rx_evt,
1351 .format_connection = format_tcp_session,
1352 .format_listener = format_tcp_listener_session,
1353 .format_half_open = format_tcp_half_open_session,
1354 .transport_options = {
1357 .tx_type = TRANSPORT_TX_PEEK,
1358 .service_type = TRANSPORT_SERVICE_VC,
1364 tcp_connection_tx_pacer_update (tcp_connection_t * tc)
1366 if (!transport_connection_is_tx_paced (&tc->connection))
1369 f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
1371 transport_connection_tx_pacer_update (&tc->connection,
1372 tcp_cc_get_pacing_rate (tc),
1373 srtt * CLIB_US_TIME_FREQ);
1377 tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
1380 f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
1381 transport_connection_tx_pacer_reset (&tc->connection,
1382 tcp_cc_get_pacing_rate (tc),
1384 srtt * CLIB_US_TIME_FREQ);
1388 tcp_reschedule (tcp_connection_t * tc)
1390 if (tcp_in_cong_recovery (tc) || tcp_snd_space_inline (tc))
1391 transport_connection_reschedule (&tc->connection);
1395 tcp_expired_timers_dispatch (u32 * expired_timers)
1397 u32 thread_index = vlib_get_thread_index (), n_left, max_per_loop;
1398 u32 connection_index, timer_id, n_expired, max_loops;
1399 tcp_worker_ctx_t *wrk;
1400 tcp_connection_t *tc;
1403 wrk = tcp_get_worker (thread_index);
1404 n_expired = vec_len (expired_timers);
1405 tcp_worker_stats_inc (wrk, timer_expirations, n_expired);
1406 n_left = clib_fifo_elts (wrk->pending_timers);
1409 * Invalidate all timer handles before dispatching. This avoids dangling
1410 * index references to timer wheel pool entries that have been freed.
1412 for (i = 0; i < n_expired; i++)
1414 connection_index = expired_timers[i] & 0x0FFFFFFF;
1415 timer_id = expired_timers[i] >> 28;
1417 if (timer_id != TCP_TIMER_RETRANSMIT_SYN)
1418 tc = tcp_connection_get (connection_index, thread_index);
1420 tc = tcp_half_open_connection_get (connection_index);
1422 TCP_EVT (TCP_EVT_TIMER_POP, connection_index, timer_id);
1424 tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
1425 tc->pending_timers |= (1 << timer_id);
1428 clib_fifo_add (wrk->pending_timers, expired_timers, n_expired);
1430 max_loops = clib_max (1, 0.5 * TCP_TIMER_TICK * wrk->vm->loops_per_second);
1431 max_per_loop = clib_max ((n_left + n_expired) / max_loops, 10);
1432 max_per_loop = clib_min (max_per_loop, VLIB_FRAME_SIZE);
1433 wrk->max_timers_per_loop = clib_max (n_left ? wrk->max_timers_per_loop : 0,
1436 if (thread_index == 0)
1437 session_queue_run_on_main_thread (wrk->vm);
1441 tcp_initialize_iss_seed (tcp_main_t * tm)
1443 u32 default_seed = random_default_seed ();
1444 u64 time_now = clib_cpu_time_now ();
1446 tm->iss_seed.first = (u64) random_u32 (&default_seed) << 32;
1447 tm->iss_seed.second = random_u64 (&time_now);
1450 static clib_error_t *
1451 tcp_main_enable (vlib_main_t * vm)
1453 vlib_thread_main_t *vtm = vlib_get_thread_main ();
1454 u32 num_threads, n_workers, prealloc_conn_per_wrk;
1455 tcp_connection_t *tc __attribute__ ((unused));
1456 tcp_main_t *tm = vnet_get_tcp_main ();
1457 tcp_worker_ctx_t *wrk;
1458 clib_error_t *error = 0;
1461 if ((error = vlib_call_init_function (vm, ip_main_init)))
1463 if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
1465 if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
1472 ip4_register_protocol (IP_PROTOCOL_TCP, tcp4_input_node.index);
1473 ip6_register_protocol (IP_PROTOCOL_TCP, tcp6_input_node.index);
1476 * Initialize data structures
1479 num_threads = 1 /* main thread */ + vtm->n_threads;
1480 vec_validate (tm->wrk_ctx, num_threads - 1);
1481 n_workers = num_threads == 1 ? 1 : vtm->n_threads;
1482 prealloc_conn_per_wrk = tcp_cfg.preallocated_connections / n_workers;
1484 wrk = &tm->wrk_ctx[0];
1485 wrk->tco_next_node[0] = vlib_node_get_next (vm, session_queue_node.index,
1486 tcp4_output_node.index);
1487 wrk->tco_next_node[1] = vlib_node_get_next (vm, session_queue_node.index,
1488 tcp6_output_node.index);
1490 for (thread = 0; thread < num_threads; thread++)
1492 wrk = &tm->wrk_ctx[thread];
1494 vec_validate (wrk->pending_deq_acked, 255);
1495 vec_validate (wrk->pending_disconnects, 255);
1496 vec_validate (wrk->pending_resets, 255);
1497 vec_reset_length (wrk->pending_deq_acked);
1498 vec_reset_length (wrk->pending_disconnects);
1499 vec_reset_length (wrk->pending_resets);
1500 wrk->vm = vlib_get_main_by_index (thread);
1501 wrk->max_timers_per_loop = 10;
1505 wrk->tco_next_node[0] = tm->wrk_ctx[0].tco_next_node[0];
1506 wrk->tco_next_node[1] = tm->wrk_ctx[0].tco_next_node[1];
1510 * Preallocate connections. Assume that thread 0 won't
1511 * use preallocated threads when running multi-core
1513 if ((thread > 0 || num_threads == 1) && prealloc_conn_per_wrk)
1514 pool_init_fixed (wrk->connections, prealloc_conn_per_wrk);
1516 tcp_timer_initialize_wheel (&wrk->timer_wheel,
1517 tcp_expired_timers_dispatch,
1518 vlib_time_now (vm));
1521 tcp_initialize_iss_seed (tm);
1523 tm->bytes_per_buffer = vlib_buffer_get_default_data_size (vm);
1524 tm->cc_last_type = TCP_CC_LAST;
1526 tm->ipl_next_node[0] = vlib_node_get_next (vm, session_queue_node.index,
1527 ip4_lookup_node.index);
1528 tm->ipl_next_node[1] = vlib_node_get_next (vm, session_queue_node.index,
1529 ip6_lookup_node.index);
1534 vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en)
1538 if (tcp_main.is_enabled)
1541 return tcp_main_enable (vm);
1545 tcp_main.is_enabled = 0;
1552 tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add)
1554 tcp_main_t *tm = &tcp_main;
1556 tm->punt_unknown4 = is_add;
1558 tm->punt_unknown6 = is_add;
1562 * Initialize default values for tcp parameters
1565 tcp_configuration_init (void)
1567 /* Initial wnd for SYN. Fifos are not allocated at that point so use some
1568 * predefined value. For SYN-ACK we still want the scale to be computed in
1570 tcp_cfg.max_rx_fifo = 32 << 20;
1571 tcp_cfg.min_rx_fifo = 4 << 10;
1573 tcp_cfg.default_mtu = 1500;
1574 tcp_cfg.initial_cwnd_multiplier = 0;
1575 tcp_cfg.enable_tx_pacing = 1;
1576 tcp_cfg.allow_tso = 0;
1577 tcp_cfg.csum_offload = 1;
1578 tcp_cfg.cc_algo = TCP_CC_CUBIC;
1579 tcp_cfg.rwnd_min_update_ack = 1;
1580 tcp_cfg.max_gso_size = TCP_MAX_GSO_SZ;
1582 /* Time constants defined as timer tick (100us) multiples */
1583 tcp_cfg.closewait_time = 20000; /* 2s */
1584 tcp_cfg.timewait_time = 100000; /* 10s */
1585 tcp_cfg.finwait1_time = 600000; /* 60s */
1586 tcp_cfg.lastack_time = 300000; /* 30s */
1587 tcp_cfg.finwait2_time = 300000; /* 30s */
1588 tcp_cfg.closing_time = 300000; /* 30s */
1589 tcp_cfg.alloc_err_timeout = 1000; /* 100ms */
1591 /* This value is seconds */
1592 tcp_cfg.cleanup_time = 0.1; /* 100ms */
1595 static clib_error_t *
1596 tcp_init (vlib_main_t * vm)
1598 tcp_main_t *tm = vnet_get_tcp_main ();
1599 ip_main_t *im = &ip_main;
1600 ip_protocol_info_t *pi;
1602 /* Session layer, and by implication tcp, are disabled by default */
1605 /* Register with IP for header parsing */
1606 pi = ip_get_protocol_info (im, IP_PROTOCOL_TCP);
1608 return clib_error_return (0, "TCP protocol info AWOL");
1609 pi->format_header = format_tcp_header;
1610 pi->unformat_pg_edit = unformat_pg_tcp_header;
1612 /* Register as transport with session layer */
1613 transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto,
1614 FIB_PROTOCOL_IP4, tcp4_output_node.index);
1615 transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto,
1616 FIB_PROTOCOL_IP6, tcp6_output_node.index);
1618 tcp_configuration_init ();
1620 tm->cc_algo_by_name = hash_create_string (0, sizeof (uword));
1625 VLIB_INIT_FUNCTION (tcp_init);
1628 * fd.io coding-style-patch-verification: ON
1631 * eval: (c-set-style "gnu")