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/session/session.h>
23 #include <vnet/fib/fib.h>
24 #include <vnet/dpo/load_balance.h>
25 #include <vnet/dpo/receive_dpo.h>
26 #include <vnet/ip/ip6_neighbor.h>
28 #include <vnet/ethernet/arp.h>
34 fib_protocol_t nh_proto;
35 vnet_link_t link_type;
39 } tcp_add_del_adj_args_t;
42 tcp_add_del_adj_cb (tcp_add_del_adj_args_t * args)
47 adj_nbr_add_or_lock (args->nh_proto, args->link_type, &args->ip,
52 ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &args->ip,
54 if (ai != ADJ_INDEX_INVALID)
60 tcp_add_del_adjacency (tcp_connection_t * tc, u8 is_add)
62 tcp_add_del_adj_args_t args = {
63 .nh_proto = FIB_PROTOCOL_IP6,
64 .link_type = VNET_LINK_IP6,
66 .sw_if_index = tc->sw_if_index,
69 vlib_rpc_call_main_thread (tcp_add_del_adj_cb, (u8 *) & args,
74 tcp_cc_init (tcp_connection_t * tc)
76 tc->cc_algo->init (tc);
80 tcp_cc_cleanup (tcp_connection_t * tc)
82 if (tc->cc_algo->cleanup)
83 tc->cc_algo->cleanup (tc);
87 tcp_cc_algo_register (tcp_cc_algorithm_type_e type,
88 const tcp_cc_algorithm_t * vft)
90 tcp_main_t *tm = vnet_get_tcp_main ();
91 vec_validate (tm->cc_algos, type);
93 tm->cc_algos[type] = *vft;
94 hash_set_mem (tm->cc_algo_by_name, vft->name, type);
98 tcp_cc_algo_get (tcp_cc_algorithm_type_e type)
100 tcp_main_t *tm = vnet_get_tcp_main ();
101 return &tm->cc_algos[type];
104 tcp_cc_algorithm_type_e
105 tcp_cc_algo_new_type (const tcp_cc_algorithm_t * vft)
107 tcp_main_t *tm = vnet_get_tcp_main ();
108 tcp_cc_algo_register (++tm->cc_last_type, vft);
109 return tm->cc_last_type;
113 tcp_connection_bind (u32 session_index, transport_endpoint_t * lcl)
115 tcp_main_t *tm = &tcp_main;
116 tcp_connection_t *listener;
119 pool_get (tm->listener_pool, listener);
120 clib_memset (listener, 0, sizeof (*listener));
122 listener->c_c_index = listener - tm->listener_pool;
123 listener->c_lcl_port = lcl->port;
125 /* If we are provided a sw_if_index, bind using one of its ips */
126 if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX)
128 if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index,
130 ip_set (&lcl->ip, iface_ip, lcl->is_ip4);
132 ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4);
133 listener->c_is_ip4 = lcl->is_ip4;
134 listener->c_proto = TRANSPORT_PROTO_TCP;
135 listener->c_s_index = session_index;
136 listener->c_fib_index = lcl->fib_index;
137 listener->state = TCP_STATE_LISTEN;
138 listener->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo);
140 tcp_connection_timers_init (listener);
142 TCP_EVT (TCP_EVT_BIND, listener);
144 return listener->c_c_index;
148 tcp_session_bind (u32 session_index, transport_endpoint_t * tep)
150 return tcp_connection_bind (session_index, tep);
154 tcp_connection_unbind (u32 listener_index)
156 tcp_main_t *tm = vnet_get_tcp_main ();
157 tcp_connection_t *tc;
159 tc = pool_elt_at_index (tm->listener_pool, listener_index);
161 TCP_EVT (TCP_EVT_UNBIND, tc);
163 /* Poison the entry */
165 clib_memset (tc, 0xFA, sizeof (*tc));
167 pool_put_index (tm->listener_pool, listener_index);
171 tcp_session_unbind (u32 listener_index)
173 tcp_connection_unbind (listener_index);
177 static transport_connection_t *
178 tcp_session_get_listener (u32 listener_index)
180 tcp_main_t *tm = vnet_get_tcp_main ();
181 tcp_connection_t *tc;
182 tc = pool_elt_at_index (tm->listener_pool, listener_index);
183 return &tc->connection;
187 * Cleanup half-open connection
191 tcp_half_open_connection_del (tcp_connection_t * tc)
193 tcp_main_t *tm = vnet_get_tcp_main ();
194 clib_spinlock_lock_if_init (&tm->half_open_lock);
196 clib_memset (tc, 0xFA, sizeof (*tc));
197 pool_put (tm->half_open_connections, tc);
198 clib_spinlock_unlock_if_init (&tm->half_open_lock);
202 * Try to cleanup half-open connection
204 * If called from a thread that doesn't own tc, the call won't have any
207 * @param tc - connection to be cleaned up
208 * @return non-zero if cleanup failed.
211 tcp_half_open_connection_cleanup (tcp_connection_t * tc)
213 /* Make sure this is the owning thread */
214 if (tc->c_thread_index != vlib_get_thread_index ())
216 tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT_SYN);
217 tcp_half_open_connection_del (tc);
221 static tcp_connection_t *
222 tcp_half_open_connection_new (void)
224 tcp_main_t *tm = vnet_get_tcp_main ();
225 tcp_connection_t *tc = 0;
226 ASSERT (vlib_get_thread_index () == 0);
227 pool_get (tm->half_open_connections, tc);
228 clib_memset (tc, 0, sizeof (*tc));
229 tc->c_c_index = tc - tm->half_open_connections;
234 * Cleans up connection state.
239 tcp_connection_cleanup (tcp_connection_t * tc)
241 tcp_main_t *tm = &tcp_main;
243 TCP_EVT (TCP_EVT_DELETE, tc);
245 /* Cleanup local endpoint if this was an active connect */
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 int thread_index = tc->c_thread_index;
262 /* Make sure all timers are cleared */
263 tcp_connection_timers_reset (tc);
265 if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
266 tcp_add_del_adjacency (tc, 0);
269 vec_free (tc->snd_sacks);
270 vec_free (tc->snd_sacks_fl);
271 vec_free (tc->rcv_opts.sacks);
272 pool_free (tc->sack_sb.holes);
274 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
277 /* Poison the entry */
279 clib_memset (tc, 0xFA, sizeof (*tc));
280 pool_put (tm->connections[thread_index], tc);
285 * Connection removal.
287 * This should be called only once connection enters CLOSED state. Note
288 * that it notifies the session of the removal event, so if the goal is to
289 * just remove the connection, call tcp_connection_cleanup instead.
292 tcp_connection_del (tcp_connection_t * tc)
294 session_transport_delete_notify (&tc->connection);
295 tcp_connection_cleanup (tc);
299 tcp_connection_alloc (u8 thread_index)
301 tcp_main_t *tm = vnet_get_tcp_main ();
302 tcp_connection_t *tc;
304 pool_get (tm->connections[thread_index], tc);
305 clib_memset (tc, 0, sizeof (*tc));
306 tc->c_c_index = tc - tm->connections[thread_index];
307 tc->c_thread_index = thread_index;
312 tcp_connection_alloc_w_base (u8 thread_index, tcp_connection_t * base)
314 tcp_main_t *tm = vnet_get_tcp_main ();
315 tcp_connection_t *tc;
317 pool_get (tm->connections[thread_index], tc);
318 clib_memcpy_fast (tc, base, sizeof (*tc));
319 tc->c_c_index = tc - tm->connections[thread_index];
320 tc->c_thread_index = thread_index;
325 tcp_connection_free (tcp_connection_t * tc)
327 tcp_main_t *tm = &tcp_main;
330 u8 thread_index = tc->c_thread_index;
331 clib_memset (tc, 0xFA, sizeof (*tc));
332 pool_put (tm->connections[thread_index], tc);
335 pool_put (tm->connections[tc->c_thread_index], tc);
338 /** Notify session that connection has been reset.
340 * Switch state to closed and wait for session to call cleanup.
343 tcp_connection_reset (tcp_connection_t * tc)
345 TCP_EVT (TCP_EVT_RST_RCVD, tc);
348 case TCP_STATE_SYN_RCVD:
349 /* Cleanup everything. App wasn't notified yet */
350 session_transport_delete_notify (&tc->connection);
351 tcp_connection_cleanup (tc);
353 case TCP_STATE_SYN_SENT:
354 session_stream_connect_notify (&tc->connection, 1 /* fail */ );
355 tcp_connection_cleanup (tc);
357 case TCP_STATE_ESTABLISHED:
358 tcp_connection_timers_reset (tc);
359 /* Set the cleanup timer, in case the session layer/app don't
360 * cleanly close the connection */
361 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
362 session_transport_reset_notify (&tc->connection);
363 tcp_cong_recovery_off (tc);
364 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
365 session_transport_closed_notify (&tc->connection);
367 case TCP_STATE_CLOSE_WAIT:
368 case TCP_STATE_FIN_WAIT_1:
369 case TCP_STATE_FIN_WAIT_2:
370 case TCP_STATE_CLOSING:
371 case TCP_STATE_LAST_ACK:
372 tcp_connection_timers_reset (tc);
373 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
374 tcp_cong_recovery_off (tc);
375 /* Make sure we mark the session as closed. In some states we may
376 * be still trying to send data */
377 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
378 session_transport_closed_notify (&tc->connection);
380 case TCP_STATE_CLOSED:
381 case TCP_STATE_TIME_WAIT:
384 TCP_DBG ("reset state: %u", tc->state);
389 * Begin connection closing procedure.
391 * If at the end the connection is not in CLOSED state, it is not removed.
392 * Instead, we rely on on TCP to advance through state machine to either
393 * 1) LAST_ACK (passive close) whereby when the last ACK is received
394 * tcp_connection_del is called. This notifies session of the delete and
396 * 2) TIME_WAIT (active close) whereby after 2MSL the 2MSL timer triggers
397 * and cleanup is called.
399 * N.B. Half-close connections are not supported
402 tcp_connection_close (tcp_connection_t * tc)
404 TCP_EVT (TCP_EVT_CLOSE, tc);
406 /* Send/Program FIN if needed and switch state */
409 case TCP_STATE_SYN_SENT:
410 /* Try to cleanup. If not on the right thread, mark as half-open done.
411 * Connection will be cleaned up when establish timer pops */
412 tcp_connection_cleanup (tc);
414 case TCP_STATE_SYN_RCVD:
415 tcp_connection_timers_reset (tc);
417 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
418 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.finwait1_time);
420 case TCP_STATE_ESTABLISHED:
421 /* If closing with unread data, reset the connection */
422 if (transport_max_rx_dequeue (&tc->connection))
425 tcp_connection_timers_reset (tc);
426 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
427 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
428 session_transport_closed_notify (&tc->connection);
431 if (!transport_max_tx_dequeue (&tc->connection))
434 tc->flags |= TCP_CONN_FINPNDG;
435 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
436 /* Set a timer in case the peer stops responding. Otherwise the
437 * connection will be stuck here forever. */
438 ASSERT (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID);
439 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.finwait1_time);
441 case TCP_STATE_CLOSE_WAIT:
442 if (!transport_max_tx_dequeue (&tc->connection))
445 tcp_connection_timers_reset (tc);
446 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
447 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.lastack_time);
450 tc->flags |= TCP_CONN_FINPNDG;
452 case TCP_STATE_FIN_WAIT_1:
453 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.finwait1_time);
455 case TCP_STATE_CLOSED:
456 tcp_connection_timers_reset (tc);
457 /* Delete connection but instead of doing it now wait until next
458 * dispatch cycle to give the session layer a chance to clear
459 * unhandled events */
460 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
463 TCP_DBG ("state: %u", tc->state);
468 tcp_session_close (u32 conn_index, u32 thread_index)
470 tcp_connection_t *tc;
471 tc = tcp_connection_get (conn_index, thread_index);
472 tcp_connection_close (tc);
476 tcp_session_cleanup (u32 conn_index, u32 thread_index)
478 tcp_connection_t *tc;
479 tc = tcp_connection_get (conn_index, thread_index);
482 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
483 tcp_connection_cleanup (tc);
487 tcp_session_reset (u32 conn_index, u32 thread_index)
489 tcp_connection_t *tc;
490 tc = tcp_connection_get (conn_index, thread_index);
491 session_transport_closed_notify (&tc->connection);
493 tcp_connection_timers_reset (tc);
494 tcp_cong_recovery_off (tc);
495 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
496 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
500 * Initialize all connection timers as invalid
503 tcp_connection_timers_init (tcp_connection_t * tc)
507 /* Set all to invalid */
508 for (i = 0; i < TCP_N_TIMERS; i++)
510 tc->timers[i] = TCP_TIMER_HANDLE_INVALID;
513 tc->rto = TCP_RTO_INIT;
517 * Stop all connection timers
520 tcp_connection_timers_reset (tcp_connection_t * tc)
523 for (i = 0; i < TCP_N_TIMERS; i++)
525 tcp_timer_reset (tc, i);
530 typedef struct ip4_tcp_hdr
536 typedef struct ip6_tcp_hdr
543 tcp_connection_select_lb_bucket (tcp_connection_t * tc, const dpo_id_t * dpo,
546 const dpo_id_t *choice;
550 lb = load_balance_get (dpo->dpoi_index);
554 clib_memset (&hdr, 0, sizeof (hdr));
555 hdr.ip.protocol = IP_PROTOCOL_TCP;
556 hdr.ip.address_pair.src.as_u32 = tc->c_lcl_ip.ip4.as_u32;
557 hdr.ip.address_pair.dst.as_u32 = tc->c_rmt_ip.ip4.as_u32;
558 hdr.tcp.src_port = tc->c_lcl_port;
559 hdr.tcp.dst_port = tc->c_rmt_port;
560 hash = ip4_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
565 clib_memset (&hdr, 0, sizeof (hdr));
566 hdr.ip.protocol = IP_PROTOCOL_TCP;
567 clib_memcpy_fast (&hdr.ip.src_address, &tc->c_lcl_ip.ip6,
568 sizeof (ip6_address_t));
569 clib_memcpy_fast (&hdr.ip.dst_address, &tc->c_rmt_ip.ip6,
570 sizeof (ip6_address_t));
571 hdr.tcp.src_port = tc->c_lcl_port;
572 hdr.tcp.dst_port = tc->c_rmt_port;
573 hash = ip6_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
575 choice = load_balance_get_bucket_i (lb, hash & lb->lb_n_buckets_minus_1);
576 dpo_copy (result, choice);
580 tcp_lookup_rmt_in_fib (tcp_connection_t * tc)
585 clib_memcpy_fast (&prefix.fp_addr, &tc->c_rmt_ip, sizeof (prefix.fp_addr));
586 prefix.fp_proto = tc->c_is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
587 prefix.fp_len = tc->c_is_ip4 ? 32 : 128;
588 fib_index = fib_table_find (prefix.fp_proto, tc->c_fib_index);
589 return fib_table_lookup (fib_index, &prefix);
593 tcp_connection_stack_on_fib_entry (tcp_connection_t * tc)
595 dpo_id_t choice = DPO_INVALID;
596 u32 output_node_index;
599 fe = fib_entry_get (tc->c_rmt_fei);
600 if (fe->fe_lb.dpoi_type != DPO_LOAD_BALANCE)
603 tcp_connection_select_lb_bucket (tc, &fe->fe_lb, &choice);
606 tc->c_is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
607 dpo_stack_from_node (output_node_index, &tc->c_rmt_dpo, &choice);
611 /** Stack tcp connection on peer's fib entry.
613 * This ultimately populates the dpo the connection will use to send packets.
616 tcp_connection_fib_attach (tcp_connection_t * tc)
618 tc->c_rmt_fei = tcp_lookup_rmt_in_fib (tc);
620 ASSERT (tc->c_rmt_fei != FIB_NODE_INDEX_INVALID);
622 tcp_connection_stack_on_fib_entry (tc);
627 * Generate random iss as per rfc6528
630 tcp_generate_random_iss (tcp_connection_t * tc)
632 tcp_main_t *tm = &tcp_main;
636 tmp = (u64) tc->c_lcl_ip.ip4.as_u32 << 32 | (u64) tc->c_rmt_ip.ip4.as_u32;
638 tmp = tc->c_lcl_ip.ip6.as_u64[0] ^ tc->c_lcl_ip.ip6.as_u64[1]
639 ^ tc->c_rmt_ip.ip6.as_u64[0] ^ tc->c_rmt_ip.ip6.as_u64[1];
641 tmp ^= tm->iss_seed.first | ((u64) tc->c_lcl_port << 16 | tc->c_rmt_port);
642 tmp ^= tm->iss_seed.second;
643 tmp = clib_xxhash (tmp) + clib_cpu_time_now ();
644 return ((tmp >> 32) ^ (tmp & 0xffffffff));
648 * Initialize max segment size we're able to process.
650 * The value is constrained by the output interface's MTU and by the size
651 * of the IP and TCP headers (see RFC6691). It is also what we advertise
655 tcp_init_rcv_mss (tcp_connection_t * tc)
659 ip_hdr_len = tc->c_is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
660 tc->mss = tcp_cfg.default_mtu - sizeof (tcp_header_t) - ip_hdr_len;
664 tcp_init_mss (tcp_connection_t * tc)
666 u16 default_min_mss = 536;
668 tcp_init_rcv_mss (tc);
670 /* TODO consider PMTU discovery */
671 tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
673 if (tc->snd_mss < 45)
675 /* Assume that at least the min default mss works */
676 tc->snd_mss = default_min_mss;
677 tc->rcv_opts.mss = default_min_mss;
680 /* We should have enough space for 40 bytes of options */
681 ASSERT (tc->snd_mss > 45);
683 /* If we use timestamp option, account for it */
684 if (tcp_opts_tstamp (&tc->rcv_opts))
685 tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
689 * Initialize connection send variables.
692 tcp_init_snd_vars (tcp_connection_t * tc)
695 * We use the time to randomize iss and for setting up the initial
696 * timestamp. Make sure it's updated otherwise syn and ack in the
697 * handshake may make it look as if time has flown in the opposite
700 tcp_set_time_now (tcp_get_worker (vlib_get_thread_index ()));
702 tcp_init_rcv_mss (tc);
703 tc->iss = tcp_generate_random_iss (tc);
704 tc->snd_una = tc->iss;
705 tc->snd_nxt = tc->iss + 1;
706 tc->snd_una_max = tc->snd_nxt;
707 tc->srtt = 100; /* 100 ms */
711 tcp_enable_pacing (tcp_connection_t * tc)
714 byte_rate = tc->cwnd / (tc->srtt * TCP_TICK);
715 transport_connection_tx_pacer_init (&tc->connection, byte_rate, tc->cwnd);
716 tc->mrtt_us = (u32) ~ 0;
719 /** Initialize tcp connection variables
721 * Should be called after having received a msg from the peer, i.e., a SYN or
722 * a SYNACK, such that connection options have already been exchanged. */
724 tcp_connection_init_vars (tcp_connection_t * tc)
726 tcp_connection_timers_init (tc);
728 scoreboard_init (&tc->sack_sb);
729 if (tc->state == TCP_STATE_SYN_RCVD)
730 tcp_init_snd_vars (tc);
734 if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
735 tcp_add_del_adjacency (tc, 1);
737 /* tcp_connection_fib_attach (tc); */
739 if (transport_connection_is_tx_paced (&tc->connection)
740 || tcp_cfg.enable_tx_pacing)
741 tcp_enable_pacing (tc);
743 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
746 if (!tcp_cfg.allow_tso)
747 tc->cfg_flags |= TCP_CFG_F_NO_TSO;
749 tc->start_ts = tcp_time_now_us (tc->c_thread_index);
753 tcp_alloc_custom_local_endpoint (tcp_main_t * tm, ip46_address_t * lcl_addr,
754 u16 * lcl_port, u8 is_ip4)
759 index = tm->last_v4_addr_rotor++;
760 if (tm->last_v4_addr_rotor >= vec_len (tcp_cfg.ip4_src_addrs))
761 tm->last_v4_addr_rotor = 0;
762 lcl_addr->ip4.as_u32 = tcp_cfg.ip4_src_addrs[index].as_u32;
766 index = tm->last_v6_addr_rotor++;
767 if (tm->last_v6_addr_rotor >= vec_len (tcp_cfg.ip6_src_addrs))
768 tm->last_v6_addr_rotor = 0;
769 clib_memcpy_fast (&lcl_addr->ip6, &tcp_cfg.ip6_src_addrs[index],
770 sizeof (ip6_address_t));
772 port = transport_alloc_local_port (TRANSPORT_PROTO_TCP, lcl_addr);
775 clib_warning ("Failed to allocate src port");
783 tcp_session_open (transport_endpoint_cfg_t * rmt)
785 tcp_main_t *tm = vnet_get_tcp_main ();
786 tcp_connection_t *tc;
787 ip46_address_t lcl_addr;
792 * Allocate local endpoint
794 if ((rmt->is_ip4 && vec_len (tcp_cfg.ip4_src_addrs))
795 || (!rmt->is_ip4 && vec_len (tcp_cfg.ip6_src_addrs)))
796 rv = tcp_alloc_custom_local_endpoint (tm, &lcl_addr, &lcl_port,
799 rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_TCP,
800 rmt, &lcl_addr, &lcl_port);
806 * Create connection and send SYN
808 clib_spinlock_lock_if_init (&tm->half_open_lock);
809 tc = tcp_half_open_connection_new ();
810 ip_copy (&tc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
811 ip_copy (&tc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
812 tc->c_rmt_port = rmt->port;
813 tc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
814 tc->c_is_ip4 = rmt->is_ip4;
815 tc->c_proto = TRANSPORT_PROTO_TCP;
816 tc->c_fib_index = rmt->fib_index;
817 tc->cc_algo = tcp_cc_algo_get (tcp_cfg.cc_algo);
818 /* The other connection vars will be initialized after SYN ACK */
819 tcp_connection_timers_init (tc);
821 TCP_EVT (TCP_EVT_OPEN, tc);
822 tc->state = TCP_STATE_SYN_SENT;
823 tcp_init_snd_vars (tc);
825 clib_spinlock_unlock_if_init (&tm->half_open_lock);
827 return tc->c_c_index;
830 const char *tcp_fsm_states[] = {
831 #define _(sym, str) str,
832 foreach_tcp_fsm_state
837 format_tcp_state (u8 * s, va_list * args)
839 u32 state = va_arg (*args, u32);
841 if (state < TCP_N_STATES)
842 s = format (s, "%s", tcp_fsm_states[state]);
844 s = format (s, "UNKNOWN (%d (0x%x))", state, state);
848 const char *tcp_cfg_flags_str[] = {
849 #define _(sym, str) str,
855 format_tcp_cfg_flags (u8 * s, va_list * args)
857 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
860 for (i = 0; i < TCP_CFG_N_FLAG_BITS; i++)
861 if (tc->cfg_flags & (1 << i))
863 for (i = 0; i < last; i++)
865 if (tc->cfg_flags & (1 << i))
866 s = format (s, "%s, ", tcp_cfg_flags_str[i]);
869 s = format (s, "%s", tcp_cfg_flags_str[last]);
873 const char *tcp_connection_flags_str[] = {
874 #define _(sym, str) str,
875 foreach_tcp_connection_flag
880 format_tcp_connection_flags (u8 * s, va_list * args)
882 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
885 for (i = 0; i < TCP_CONN_N_FLAG_BITS; i++)
886 if (tc->flags & (1 << i))
888 for (i = 0; i < last; i++)
890 if (tc->flags & (1 << i))
891 s = format (s, "%s, ", tcp_connection_flags_str[i]);
894 s = format (s, "%s", tcp_connection_flags_str[last]);
898 const char *tcp_conn_timers[] = {
899 #define _(sym, str) str,
905 format_tcp_timers (u8 * s, va_list * args)
907 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
910 for (i = 0; i < TCP_N_TIMERS; i++)
911 if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID)
914 for (i = 0; i < last; i++)
916 if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID)
917 s = format (s, "%s,", tcp_conn_timers[i]);
921 s = format (s, "%s", tcp_conn_timers[i]);
927 format_tcp_congestion_status (u8 * s, va_list * args)
929 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
930 if (tcp_in_recovery (tc))
931 s = format (s, "recovery");
932 else if (tcp_in_fastrecovery (tc))
933 s = format (s, "fastrecovery");
935 s = format (s, "none");
940 tcp_rcv_wnd_available (tcp_connection_t * tc)
942 return (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
946 format_tcp_congestion (u8 * s, va_list * args)
948 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
949 u32 indent = format_get_indent (s), prr_space = 0;
951 s = format (s, "%U ", format_tcp_congestion_status, tc);
952 s = format (s, "algo %s cwnd %u ssthresh %u bytes_acked %u\n",
953 tc->cc_algo->name, tc->cwnd, tc->ssthresh, tc->bytes_acked);
954 s = format (s, "%Ucc space %u prev_cwnd %u prev_ssthresh %u\n",
955 format_white_space, indent, tcp_available_cc_snd_space (tc),
956 tc->prev_cwnd, tc->prev_ssthresh);
957 s = format (s, "%Usnd_cong %u dupack %u limited_tx %u\n",
958 format_white_space, indent, tc->snd_congestion - tc->iss,
959 tc->rcv_dupacks, tc->limited_transmit - tc->iss);
960 s = format (s, "%Urxt_bytes %u rxt_delivered %u rxt_head %u rxt_ts %u\n",
961 format_white_space, indent, tc->snd_rxt_bytes,
962 tc->rxt_delivered, tc->rxt_head - tc->iss,
963 tcp_time_now_w_thread (tc->c_thread_index) - tc->snd_rxt_ts);
964 if (tcp_in_fastrecovery (tc))
965 prr_space = tcp_fastrecovery_prr_snd_space (tc);
966 s = format (s, "%Uprr_start %u prr_delivered %u prr space %u\n",
967 format_white_space, indent, tc->prr_start - tc->iss,
968 tc->prr_delivered, prr_space);
973 format_tcp_stats (u8 * s, va_list * args)
975 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
976 u32 indent = format_get_indent (s);
977 s = format (s, "in segs %lu dsegs %lu bytes %lu dupacks %u\n",
978 tc->segs_in, tc->data_segs_in, tc->bytes_in, tc->dupacks_in);
979 s = format (s, "%Uout segs %lu dsegs %lu bytes %lu dupacks %u\n",
980 format_white_space, indent, tc->segs_out,
981 tc->data_segs_out, tc->bytes_out, tc->dupacks_out);
982 s = format (s, "%Ufr %u tr %u rxt segs %lu bytes %lu duration %.3f\n",
983 format_white_space, indent, tc->fr_occurences,
984 tc->tr_occurences, tc->segs_retrans, tc->bytes_retrans,
985 tcp_time_now_us (tc->c_thread_index) - tc->start_ts);
986 s = format (s, "%Uerr wnd data below %u above %u ack below %u above %u",
987 format_white_space, indent, tc->errors.below_data_wnd,
988 tc->errors.above_data_wnd, tc->errors.below_ack_wnd,
989 tc->errors.above_ack_wnd);
994 format_tcp_vars (u8 * s, va_list * args)
996 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
997 s = format (s, " index: %u cfg: %U flags: %U timers: %U\n", tc->c_c_index,
998 format_tcp_cfg_flags, tc, format_tcp_connection_flags, tc,
999 format_tcp_timers, tc);
1000 s = format (s, " snd_una %u snd_nxt %u snd_una_max %u",
1001 tc->snd_una - tc->iss, tc->snd_nxt - tc->iss,
1002 tc->snd_una_max - tc->iss);
1003 s = format (s, " rcv_nxt %u rcv_las %u\n",
1004 tc->rcv_nxt - tc->irs, tc->rcv_las - tc->irs);
1005 s = format (s, " snd_wnd %u rcv_wnd %u rcv_wscale %u ",
1006 tc->snd_wnd, tc->rcv_wnd, tc->rcv_wscale);
1007 s = format (s, "snd_wl1 %u snd_wl2 %u\n", tc->snd_wl1 - tc->irs,
1008 tc->snd_wl2 - tc->iss);
1009 s = format (s, " flight size %u out space %u rcv_wnd_av %u",
1010 tcp_flight_size (tc), tcp_available_output_snd_space (tc),
1011 tcp_rcv_wnd_available (tc));
1012 s = format (s, " tsval_recent %u\n", tc->tsval_recent);
1013 s = format (s, " tsecr %u tsecr_last_ack %u tsval_recent_age %u",
1014 tc->rcv_opts.tsecr, tc->tsecr_last_ack,
1015 tcp_time_now () - tc->tsval_recent_age);
1016 s = format (s, " snd_mss %u\n", tc->snd_mss);
1017 s = format (s, " rto %u rto_boff %u srtt %u us %.3f rttvar %u rtt_ts %.4f",
1018 tc->rto, tc->rto_boff, tc->srtt, tc->mrtt_us * 1000, tc->rttvar,
1020 s = format (s, " rtt_seq %u\n", tc->rtt_seq - tc->iss);
1021 s = format (s, " next_node %u opaque 0x%x\n", tc->next_node_index,
1022 tc->next_node_opaque);
1023 s = format (s, " cong: %U", format_tcp_congestion, tc);
1025 if (tc->state >= TCP_STATE_ESTABLISHED)
1027 s = format (s, " sboard: %U\n", format_tcp_scoreboard, &tc->sack_sb,
1029 s = format (s, " stats: %U\n", format_tcp_stats, tc);
1031 if (vec_len (tc->snd_sacks))
1032 s = format (s, " sacks tx: %U\n", format_tcp_sacks, tc);
1038 format_tcp_connection_id (u8 * s, va_list * args)
1040 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
1045 s = format (s, "[%d:%d][%s] %U:%d->%U:%d", tc->c_thread_index,
1046 tc->c_s_index, "T", format_ip4_address, &tc->c_lcl_ip4,
1047 clib_net_to_host_u16 (tc->c_lcl_port), format_ip4_address,
1048 &tc->c_rmt_ip4, clib_net_to_host_u16 (tc->c_rmt_port));
1052 s = format (s, "[%d:%d][%s] %U:%d->%U:%d", tc->c_thread_index,
1053 tc->c_s_index, "T", format_ip6_address, &tc->c_lcl_ip6,
1054 clib_net_to_host_u16 (tc->c_lcl_port), format_ip6_address,
1055 &tc->c_rmt_ip6, clib_net_to_host_u16 (tc->c_rmt_port));
1062 format_tcp_connection (u8 * s, va_list * args)
1064 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
1065 u32 verbose = va_arg (*args, u32);
1069 s = format (s, "%-50U", format_tcp_connection_id, tc);
1072 s = format (s, "%-15U", format_tcp_state, tc->state);
1074 s = format (s, "\n%U", format_tcp_vars, tc);
1081 format_tcp_session (u8 * s, va_list * args)
1083 u32 tci = va_arg (*args, u32);
1084 u32 thread_index = va_arg (*args, u32);
1085 u32 verbose = va_arg (*args, u32);
1086 tcp_connection_t *tc;
1088 tc = tcp_connection_get (tci, thread_index);
1090 s = format (s, "%U", format_tcp_connection, tc, verbose);
1092 s = format (s, "empty\n");
1097 format_tcp_listener_session (u8 * s, va_list * args)
1099 u32 tci = va_arg (*args, u32);
1100 u32 __clib_unused thread_index = va_arg (*args, u32);
1101 u32 verbose = va_arg (*args, u32);
1102 tcp_connection_t *tc = tcp_listener_get (tci);
1103 s = format (s, "%-50U", format_tcp_connection_id, tc);
1105 s = format (s, "%-15U", format_tcp_state, tc->state);
1110 format_tcp_half_open_session (u8 * s, va_list * args)
1112 u32 tci = va_arg (*args, u32);
1113 u32 __clib_unused thread_index = va_arg (*args, u32);
1114 tcp_connection_t *tc = tcp_half_open_connection_get (tci);
1115 return format (s, "%U", format_tcp_connection_id, tc);
1119 format_tcp_sacks (u8 * s, va_list * args)
1121 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
1122 sack_block_t *sacks = tc->snd_sacks;
1123 sack_block_t *block;
1126 len = vec_len (sacks);
1127 for (i = 0; i < len - 1; i++)
1130 s = format (s, " start %u end %u\n", block->start - tc->irs,
1131 block->end - tc->irs);
1135 block = &sacks[len - 1];
1136 s = format (s, " start %u end %u", block->start - tc->irs,
1137 block->end - tc->irs);
1143 format_tcp_rcv_sacks (u8 * s, va_list * args)
1145 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
1146 sack_block_t *sacks = tc->rcv_opts.sacks;
1147 sack_block_t *block;
1150 len = vec_len (sacks);
1151 for (i = 0; i < len - 1; i++)
1154 s = format (s, " start %u end %u\n", block->start - tc->iss,
1155 block->end - tc->iss);
1159 block = &sacks[len - 1];
1160 s = format (s, " start %u end %u", block->start - tc->iss,
1161 block->end - tc->iss);
1167 format_tcp_sack_hole (u8 * s, va_list * args)
1169 sack_scoreboard_hole_t *hole = va_arg (*args, sack_scoreboard_hole_t *);
1170 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
1172 s = format (s, " [%u, %u]", hole->start - tc->iss, hole->end - tc->iss);
1174 s = format (s, " [%u, %u]", hole->start, hole->end);
1179 format_tcp_scoreboard (u8 * s, va_list * args)
1181 sack_scoreboard_t *sb = va_arg (*args, sack_scoreboard_t *);
1182 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
1183 sack_scoreboard_hole_t *hole;
1184 u32 indent = format_get_indent (s);
1186 s = format (s, "sacked %u last_sacked %u lost %u last_lost %u"
1188 sb->sacked_bytes, sb->last_sacked_bytes, sb->lost_bytes,
1189 sb->last_lost_bytes, sb->rxt_sacked);
1190 s = format (s, "%Ulast_delivered %u high_sacked %u is_reneging %u\n",
1191 format_white_space, indent, sb->last_bytes_delivered,
1192 sb->high_sacked - tc->iss, sb->is_reneging);
1193 s = format (s, "%Ucur_rxt_hole %u high_rxt %u rescue_rxt %u",
1194 format_white_space, indent, sb->cur_rxt_hole,
1195 sb->high_rxt - tc->iss, sb->rescue_rxt - tc->iss);
1197 hole = scoreboard_first_hole (sb);
1199 s = format (s, "\n%Uhead %u tail %u %u holes:\n%U", format_white_space,
1200 indent, sb->head, sb->tail, pool_elts (sb->holes),
1201 format_white_space, indent);
1205 s = format (s, "%U", format_tcp_sack_hole, hole, tc);
1206 hole = scoreboard_next_hole (sb, hole);
1212 static transport_connection_t *
1213 tcp_session_get_transport (u32 conn_index, u32 thread_index)
1215 tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index);
1216 if (PREDICT_FALSE (!tc))
1218 return &tc->connection;
1221 static transport_connection_t *
1222 tcp_half_open_session_get_transport (u32 conn_index)
1224 tcp_connection_t *tc = tcp_half_open_connection_get (conn_index);
1225 return &tc->connection;
1229 tcp_session_cal_goal_size (tcp_connection_t * tc)
1231 u16 goal_size = tc->snd_mss;
1233 goal_size = TCP_MAX_GSO_SZ - tc->snd_mss % TCP_MAX_GSO_SZ;
1234 goal_size = clib_min (goal_size, tc->snd_wnd / 2);
1236 return goal_size > tc->snd_mss ? goal_size : tc->snd_mss;
1240 * Compute maximum segment size for session layer.
1242 * Since the result needs to be the actual data length, it first computes
1243 * the tcp options to be used in the next burst and subtracts their
1244 * length from the connection's snd_mss.
1247 tcp_session_send_mss (transport_connection_t * trans_conn)
1249 tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1251 /* Ensure snd_mss does accurately reflect the amount of data we can push
1252 * in a segment. This also makes sure that options are updated according to
1253 * the current state of the connection. */
1254 tcp_update_burst_snd_vars (tc);
1256 if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_TSO))
1257 return tcp_session_cal_goal_size (tc);
1263 tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space)
1265 if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
1267 return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0;
1270 /* If not snd_wnd constrained and we can't write at least a segment,
1271 * don't try at all */
1272 if (PREDICT_FALSE (snd_space < tc->snd_mss))
1273 return snd_space < tc->cwnd ? 0 : snd_space;
1275 /* round down to mss multiple */
1276 return snd_space - (snd_space % tc->snd_mss);
1280 * Compute tx window session is allowed to fill.
1282 * Takes into account available send space, snd_mss and the congestion
1283 * state of the connection. If possible, the value returned is a multiple
1286 * @param tc tcp connection
1287 * @return number of bytes session is allowed to write
1290 tcp_snd_space_inline (tcp_connection_t * tc)
1294 if (PREDICT_FALSE (tcp_in_fastrecovery (tc)
1295 || tc->state == TCP_STATE_CLOSED))
1298 snd_space = tcp_available_output_snd_space (tc);
1300 /* If we got dupacks or sacked bytes but we're not yet in recovery, try
1301 * to force the peer to send enough dupacks to start retransmitting as
1302 * per Limited Transmit (RFC3042)
1304 if (PREDICT_FALSE (tc->rcv_dupacks != 0 || tc->sack_sb.sacked_bytes))
1306 if (tc->limited_transmit != tc->snd_nxt
1307 && (seq_lt (tc->limited_transmit, tc->snd_nxt - 2 * tc->snd_mss)
1308 || seq_gt (tc->limited_transmit, tc->snd_nxt)))
1309 tc->limited_transmit = tc->snd_nxt;
1311 ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt));
1313 int snt_limited = tc->snd_nxt - tc->limited_transmit;
1314 snd_space = clib_max ((int) 2 * tc->snd_mss - snt_limited, 0);
1316 return tcp_round_snd_space (tc, snd_space);
1320 tcp_snd_space (tcp_connection_t * tc)
1322 return tcp_snd_space_inline (tc);
1326 tcp_session_send_space (transport_connection_t * trans_conn)
1328 tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1329 return clib_min (tcp_snd_space_inline (tc),
1330 tc->snd_wnd - (tc->snd_nxt - tc->snd_una));
1334 tcp_session_tx_fifo_offset (transport_connection_t * trans_conn)
1336 tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1338 ASSERT (seq_geq (tc->snd_nxt, tc->snd_una));
1340 /* This still works if fast retransmit is on */
1341 return (tc->snd_nxt - tc->snd_una);
1345 tcp_update_time (f64 now, u8 thread_index)
1347 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1349 tcp_set_time_now (wrk);
1350 tw_timer_expire_timers_16t_2w_512sl (&wrk->timer_wheel, now);
1351 tcp_flush_frames_to_output (wrk);
1355 tcp_session_flush_data (transport_connection_t * tconn)
1357 tcp_connection_t *tc = (tcp_connection_t *) tconn;
1358 if (tc->flags & TCP_CONN_PSH_PENDING)
1360 tc->flags |= TCP_CONN_PSH_PENDING;
1361 tc->psh_seq = tc->snd_una + transport_max_tx_dequeue (tconn) - 1;
1365 const static transport_proto_vft_t tcp_proto = {
1366 .enable = vnet_tcp_enable_disable,
1367 .start_listen = tcp_session_bind,
1368 .stop_listen = tcp_session_unbind,
1369 .push_header = tcp_session_push_header,
1370 .get_connection = tcp_session_get_transport,
1371 .get_listener = tcp_session_get_listener,
1372 .get_half_open = tcp_half_open_session_get_transport,
1373 .connect = tcp_session_open,
1374 .close = tcp_session_close,
1375 .cleanup = tcp_session_cleanup,
1376 .reset = tcp_session_reset,
1377 .send_mss = tcp_session_send_mss,
1378 .send_space = tcp_session_send_space,
1379 .update_time = tcp_update_time,
1380 .tx_fifo_offset = tcp_session_tx_fifo_offset,
1381 .flush_data = tcp_session_flush_data,
1382 .custom_tx = tcp_session_custom_tx,
1383 .format_connection = format_tcp_session,
1384 .format_listener = format_tcp_listener_session,
1385 .format_half_open = format_tcp_half_open_session,
1386 .transport_options = {
1387 .tx_type = TRANSPORT_TX_PEEK,
1388 .service_type = TRANSPORT_SERVICE_VC,
1394 tcp_connection_tx_pacer_update (tcp_connection_t * tc)
1396 if (!transport_connection_is_tx_paced (&tc->connection))
1399 f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
1401 transport_connection_tx_pacer_update (&tc->connection,
1402 tcp_cc_get_pacing_rate (tc),
1403 srtt * CLIB_US_TIME_FREQ);
1407 tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
1410 f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us);
1411 u64 rate = (u64) window / srtt;
1412 transport_connection_tx_pacer_reset (&tc->connection, rate, start_bucket,
1413 srtt * CLIB_US_TIME_FREQ);
1417 tcp_timer_waitclose_handler (u32 conn_index)
1419 u32 thread_index = vlib_get_thread_index ();
1420 tcp_connection_t *tc;
1422 tc = tcp_connection_get (conn_index, thread_index);
1426 tc->timers[TCP_TIMER_WAITCLOSE] = TCP_TIMER_HANDLE_INVALID;
1430 case TCP_STATE_CLOSE_WAIT:
1431 tcp_connection_timers_reset (tc);
1432 session_transport_closed_notify (&tc->connection);
1434 if (!(tc->flags & TCP_CONN_FINPNDG))
1436 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1437 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
1441 /* Session didn't come back with a close. Send FIN either way
1442 * and switch to LAST_ACK. */
1443 tcp_cong_recovery_off (tc);
1444 /* Make sure we don't try to send unsent data */
1445 tc->snd_nxt = tc->snd_una;
1447 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
1449 /* Make sure we don't wait in LAST ACK forever */
1450 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.lastack_time);
1452 /* Don't delete the connection yet */
1454 case TCP_STATE_FIN_WAIT_1:
1455 tcp_connection_timers_reset (tc);
1456 session_transport_closed_notify (&tc->connection);
1457 if (tc->flags & TCP_CONN_FINPNDG)
1459 /* If FIN pending, we haven't sent everything, but we did try.
1460 * Notify session layer that transport is closed. */
1461 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1462 tcp_send_reset (tc);
1463 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
1467 /* We've sent the fin but no progress. Close the connection and
1468 * to make sure everything is flushed, setup a cleanup timer */
1469 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1470 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
1473 case TCP_STATE_LAST_ACK:
1474 case TCP_STATE_CLOSING:
1475 tcp_connection_timers_reset (tc);
1476 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
1477 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
1478 session_transport_closed_notify (&tc->connection);
1481 tcp_connection_del (tc);
1487 static timer_expiration_handler *timer_expiration_handlers[TCP_N_TIMERS] =
1489 tcp_timer_retransmit_handler,
1490 tcp_timer_delack_handler,
1491 tcp_timer_persist_handler,
1492 tcp_timer_waitclose_handler,
1493 tcp_timer_retransmit_syn_handler,
1498 tcp_expired_timers_dispatch (u32 * expired_timers)
1501 u32 connection_index, timer_id;
1503 for (i = 0; i < vec_len (expired_timers); i++)
1505 /* Get session index and timer id */
1506 connection_index = expired_timers[i] & 0x0FFFFFFF;
1507 timer_id = expired_timers[i] >> 28;
1509 TCP_EVT (TCP_EVT_TIMER_POP, connection_index, timer_id);
1511 /* Handle expiration */
1512 (*timer_expiration_handlers[timer_id]) (connection_index);
1517 tcp_initialize_timer_wheels (tcp_main_t * tm)
1519 tw_timer_wheel_16t_2w_512sl_t *tw;
1521 foreach_vlib_main (({
1522 tw = &tm->wrk_ctx[ii].timer_wheel;
1523 tw_timer_wheel_init_16t_2w_512sl (tw, tcp_expired_timers_dispatch,
1524 TCP_TIMER_TICK, ~0);
1525 tw->last_run_time = vlib_time_now (this_vlib_main);
1531 tcp_initialize_iss_seed (tcp_main_t * tm)
1533 u32 default_seed = random_default_seed ();
1534 u64 time_now = clib_cpu_time_now ();
1536 tm->iss_seed.first = (u64) random_u32 (&default_seed) << 32;
1537 tm->iss_seed.second = random_u64 (&time_now);
1540 static clib_error_t *
1541 tcp_main_enable (vlib_main_t * vm)
1543 vlib_thread_main_t *vtm = vlib_get_thread_main ();
1544 u32 num_threads, n_workers, prealloc_conn_per_wrk;
1545 tcp_connection_t *tc __attribute__ ((unused));
1546 tcp_main_t *tm = vnet_get_tcp_main ();
1547 clib_error_t *error = 0;
1550 if ((error = vlib_call_init_function (vm, ip_main_init)))
1552 if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
1554 if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
1561 ip4_register_protocol (IP_PROTOCOL_TCP, tcp4_input_node.index);
1562 ip6_register_protocol (IP_PROTOCOL_TCP, tcp6_input_node.index);
1565 * Initialize data structures
1568 num_threads = 1 /* main thread */ + vtm->n_threads;
1569 vec_validate (tm->connections, num_threads - 1);
1570 vec_validate (tm->wrk_ctx, num_threads - 1);
1571 n_workers = num_threads == 1 ? 1 : vtm->n_threads;
1572 prealloc_conn_per_wrk = tcp_cfg.preallocated_connections / n_workers;
1574 for (thread = 0; thread < num_threads; thread++)
1576 vec_validate (tm->wrk_ctx[thread].pending_deq_acked, 255);
1577 vec_validate (tm->wrk_ctx[thread].pending_disconnects, 255);
1578 vec_reset_length (tm->wrk_ctx[thread].pending_deq_acked);
1579 vec_reset_length (tm->wrk_ctx[thread].pending_disconnects);
1580 tm->wrk_ctx[thread].vm = vlib_mains[thread];
1583 * Preallocate connections. Assume that thread 0 won't
1584 * use preallocated threads when running multi-core
1586 if ((thread > 0 || num_threads == 1) && prealloc_conn_per_wrk)
1587 pool_init_fixed (tm->connections[thread], prealloc_conn_per_wrk);
1591 * Use a preallocated half-open connection pool?
1593 if (tcp_cfg.preallocated_half_open_connections)
1594 pool_init_fixed (tm->half_open_connections,
1595 tcp_cfg.preallocated_half_open_connections);
1597 /* Initialize clocks per tick for TCP timestamp. Used to compute
1598 * monotonically increasing timestamps. */
1599 tm->tstamp_ticks_per_clock = vm->clib_time.seconds_per_clock
1600 / TCP_TSTAMP_RESOLUTION;
1602 if (num_threads > 1)
1604 clib_spinlock_init (&tm->half_open_lock);
1607 tcp_initialize_timer_wheels (tm);
1608 tcp_initialize_iss_seed (tm);
1610 tm->bytes_per_buffer = vlib_buffer_get_default_data_size (vm);
1611 tm->cc_last_type = TCP_CC_LAST;
1616 vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en)
1620 if (tcp_main.is_enabled)
1623 return tcp_main_enable (vm);
1627 tcp_main.is_enabled = 0;
1634 tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add)
1636 tcp_main_t *tm = &tcp_main;
1638 tm->punt_unknown4 = is_add;
1640 tm->punt_unknown6 = is_add;
1644 * Initialize default values for tcp parameters
1647 tcp_configuration_init (void)
1649 /* Initial wnd for SYN. Fifos are not allocated at that point so use some
1650 * predefined value. For SYN-ACK we still want the scale to be computed in
1652 tcp_cfg.max_rx_fifo = 32 << 20;
1653 tcp_cfg.min_rx_fifo = 4 << 10;
1655 tcp_cfg.default_mtu = 1500;
1656 tcp_cfg.initial_cwnd_multiplier = 0;
1657 tcp_cfg.enable_tx_pacing = 1;
1658 tcp_cfg.allow_tso = 0;
1659 tcp_cfg.cc_algo = TCP_CC_NEWRENO;
1660 tcp_cfg.rwnd_min_update_ack = 1;
1662 /* Time constants defined as timer tick (100ms) multiples */
1663 tcp_cfg.delack_time = 1; /* 0.1s */
1664 tcp_cfg.closewait_time = 20; /* 2s */
1665 tcp_cfg.timewait_time = 100; /* 10s */
1666 tcp_cfg.finwait1_time = 600; /* 60s */
1667 tcp_cfg.lastack_time = 300; /* 30s */
1668 tcp_cfg.finwait2_time = 300; /* 30s */
1669 tcp_cfg.closing_time = 300; /* 30s */
1670 tcp_cfg.cleanup_time = 1; /* 0.1s */
1673 static clib_error_t *
1674 tcp_init (vlib_main_t * vm)
1676 tcp_main_t *tm = vnet_get_tcp_main ();
1677 ip_main_t *im = &ip_main;
1678 ip_protocol_info_t *pi;
1680 /* Session layer, and by implication tcp, are disabled by default */
1683 /* Register with IP for header parsing */
1684 pi = ip_get_protocol_info (im, IP_PROTOCOL_TCP);
1686 return clib_error_return (0, "TCP protocol info AWOL");
1687 pi->format_header = format_tcp_header;
1688 pi->unformat_pg_edit = unformat_pg_tcp_header;
1690 /* Register as transport with session layer */
1691 transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto,
1692 FIB_PROTOCOL_IP4, tcp4_output_node.index);
1693 transport_register_protocol (TRANSPORT_PROTO_TCP, &tcp_proto,
1694 FIB_PROTOCOL_IP6, tcp6_output_node.index);
1696 tcp_api_reference ();
1697 tcp_configuration_init ();
1699 tm->cc_algo_by_name = hash_create_string (0, sizeof (uword));
1704 VLIB_INIT_FUNCTION (tcp_init);
1707 unformat_tcp_cc_algo (unformat_input_t * input, va_list * va)
1709 tcp_cc_algorithm_type_e *result = va_arg (*va, tcp_cc_algorithm_type_e *);
1710 tcp_main_t *tm = &tcp_main;
1715 if (unformat (input, "%s", &cc_algo_name)
1716 && ((p = hash_get_mem (tm->cc_algo_by_name, cc_algo_name))))
1722 vec_free (cc_algo_name);
1727 unformat_tcp_cc_algo_cfg (unformat_input_t * input, va_list * va)
1729 tcp_main_t *tm = vnet_get_tcp_main ();
1730 tcp_cc_algorithm_t *cc_alg;
1731 unformat_input_t sub_input;
1734 vec_foreach (cc_alg, tm->cc_algos)
1736 if (!unformat (input, cc_alg->name))
1739 if (cc_alg->unformat_cfg
1740 && unformat (input, "%U", unformat_vlib_cli_sub_input, &sub_input))
1742 if (cc_alg->unformat_cfg (&sub_input))
1749 static clib_error_t *
1750 tcp_config_fn (vlib_main_t * vm, unformat_input_t * input)
1752 u32 cwnd_multiplier, tmp_time;
1755 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1757 if (unformat (input, "preallocated-connections %d",
1758 &tcp_cfg.preallocated_connections))
1760 else if (unformat (input, "preallocated-half-open-connections %d",
1761 &tcp_cfg.preallocated_half_open_connections))
1763 else if (unformat (input, "buffer-fail-fraction %f",
1764 &tcp_cfg.buffer_fail_fraction))
1766 else if (unformat (input, "max-rx-fifo %U", unformat_memory_size,
1769 if (memory_size >= 0x100000000)
1771 return clib_error_return
1772 (0, "max-rx-fifo %llu (0x%llx) too large", memory_size,
1775 tcp_cfg.max_rx_fifo = memory_size;
1777 else if (unformat (input, "min-rx-fifo %U", unformat_memory_size,
1780 if (memory_size >= 0x100000000)
1782 return clib_error_return
1783 (0, "min-rx-fifo %llu (0x%llx) too large", memory_size,
1786 tcp_cfg.min_rx_fifo = memory_size;
1788 else if (unformat (input, "mtu %u", &tcp_cfg.default_mtu))
1790 else if (unformat (input, "rwnd-min-update-ack %d",
1791 &tcp_cfg.rwnd_min_update_ack))
1793 else if (unformat (input, "initial-cwnd-multiplier %u",
1795 tcp_cfg.initial_cwnd_multiplier = cwnd_multiplier;
1796 else if (unformat (input, "no-tx-pacing"))
1797 tcp_cfg.enable_tx_pacing = 0;
1798 else if (unformat (input, "tso"))
1799 tcp_cfg.allow_tso = 1;
1800 else if (unformat (input, "cc-algo %U", unformat_tcp_cc_algo,
1803 else if (unformat (input, "%U", unformat_tcp_cc_algo_cfg))
1805 else if (unformat (input, "closewait-time %u", &tmp_time))
1806 tcp_cfg.closewait_time = tmp_time / TCP_TIMER_TICK;
1807 else if (unformat (input, "timewait-time %u", &tmp_time))
1808 tcp_cfg.timewait_time = tmp_time / TCP_TIMER_TICK;
1809 else if (unformat (input, "finwait1-time %u", &tmp_time))
1810 tcp_cfg.finwait1_time = tmp_time / TCP_TIMER_TICK;
1811 else if (unformat (input, "finwait2-time %u", &tmp_time))
1812 tcp_cfg.finwait2_time = tmp_time / TCP_TIMER_TICK;
1813 else if (unformat (input, "lastack-time %u", &tmp_time))
1814 tcp_cfg.lastack_time = tmp_time / TCP_TIMER_TICK;
1815 else if (unformat (input, "closing-time %u", &tmp_time))
1816 tcp_cfg.closing_time = tmp_time / TCP_TIMER_TICK;
1817 else if (unformat (input, "cleanup-time %u", &tmp_time))
1818 tcp_cfg.cleanup_time = tmp_time / TCP_TIMER_TICK;
1820 return clib_error_return (0, "unknown input `%U'",
1821 format_unformat_error, input);
1826 VLIB_CONFIG_FUNCTION (tcp_config_fn, "tcp");
1830 * \brief Configure an ipv4 source address range
1831 * @param vm vlib_main_t pointer
1832 * @param start first ipv4 address in the source address range
1833 * @param end last ipv4 address in the source address range
1834 * @param table_id VRF / table ID, 0 for the default FIB
1835 * @return 0 if all OK, else an error indication from api_errno.h
1839 tcp_configure_v4_source_address_range (vlib_main_t * vm,
1840 ip4_address_t * start,
1841 ip4_address_t * end, u32 table_id)
1843 vnet_main_t *vnm = vnet_get_main ();
1844 u32 start_host_byte_order, end_host_byte_order;
1845 fib_prefix_t prefix;
1846 fib_node_index_t fei;
1851 clib_memset (&prefix, 0, sizeof (prefix));
1853 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
1855 if (fib_index == ~0)
1856 return VNET_API_ERROR_NO_SUCH_FIB;
1858 start_host_byte_order = clib_net_to_host_u32 (start->as_u32);
1859 end_host_byte_order = clib_net_to_host_u32 (end->as_u32);
1861 /* sanity check for reversed args or some such */
1862 if ((end_host_byte_order - start_host_byte_order) > (10 << 10))
1863 return VNET_API_ERROR_INVALID_ARGUMENT;
1865 /* Lookup the last address, to identify the interface involved */
1867 prefix.fp_proto = FIB_PROTOCOL_IP4;
1868 memcpy (&prefix.fp_addr.ip4, end, sizeof (ip4_address_t));
1870 fei = fib_table_lookup (fib_index, &prefix);
1872 /* Couldn't find route to destination. Bail out. */
1873 if (fei == FIB_NODE_INDEX_INVALID)
1874 return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB;
1876 sw_if_index = fib_entry_get_resolving_interface (fei);
1878 /* Configure proxy arp across the range */
1879 rv = vnet_proxy_arp_add_del (start, end, fib_index, 0 /* is_del */ );
1884 rv = vnet_proxy_arp_enable_disable (vnm, sw_if_index, 1);
1891 dpo_id_t dpo = DPO_INVALID;
1893 vec_add1 (tcp_cfg.ip4_src_addrs, start[0]);
1895 /* Add local adjacencies for the range */
1897 receive_dpo_add_or_lock (DPO_PROTO_IP4, ~0 /* sw_if_index */ ,
1900 prefix.fp_proto = FIB_PROTOCOL_IP4;
1901 prefix.fp_addr.ip4.as_u32 = start->as_u32;
1903 fib_table_entry_special_dpo_update (fib_index,
1906 FIB_ENTRY_FLAG_EXCLUSIVE, &dpo);
1909 start_host_byte_order++;
1910 start->as_u32 = clib_host_to_net_u32 (start_host_byte_order);
1912 while (start_host_byte_order <= end_host_byte_order);
1918 * \brief Configure an ipv6 source address range
1919 * @param vm vlib_main_t pointer
1920 * @param start first ipv6 address in the source address range
1921 * @param end last ipv6 address in the source address range
1922 * @param table_id VRF / table ID, 0 for the default FIB
1923 * @return 0 if all OK, else an error indication from api_errno.h
1927 tcp_configure_v6_source_address_range (vlib_main_t * vm,
1928 ip6_address_t * start,
1929 ip6_address_t * end, u32 table_id)
1931 fib_prefix_t prefix;
1933 fib_node_index_t fei;
1936 clib_memset (&prefix, 0, sizeof (prefix));
1938 fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
1940 if (fib_index == ~0)
1941 return VNET_API_ERROR_NO_SUCH_FIB;
1947 dpo_id_t dpo = DPO_INVALID;
1949 /* Remember this address */
1950 vec_add1 (tcp_cfg.ip6_src_addrs, start[0]);
1952 /* Lookup the prefix, to identify the interface involved */
1953 prefix.fp_len = 128;
1954 prefix.fp_proto = FIB_PROTOCOL_IP6;
1955 memcpy (&prefix.fp_addr.ip6, start, sizeof (ip6_address_t));
1957 fei = fib_table_lookup (fib_index, &prefix);
1959 /* Couldn't find route to destination. Bail out. */
1960 if (fei == FIB_NODE_INDEX_INVALID)
1961 return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB;
1963 sw_if_index = fib_entry_get_resolving_interface (fei);
1965 if (sw_if_index == (u32) ~ 0)
1966 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
1968 /* Add a proxy neighbor discovery entry for this address */
1969 ip6_neighbor_proxy_add_del (sw_if_index, start, 0 /* is_del */ );
1971 /* Add a receive adjacency for this address */
1972 receive_dpo_add_or_lock (DPO_PROTO_IP6, ~0 /* sw_if_index */ ,
1975 fib_table_entry_special_dpo_update (fib_index,
1978 FIB_ENTRY_FLAG_EXCLUSIVE, &dpo);
1981 /* Done with the entire range? */
1982 if (!memcmp (start, end, sizeof (start[0])))
1985 /* Increment the address. DGMS. */
1987 for (i = 15; i >= 0; i--)
1990 if (tmp.as_u8[i] != 0)
1998 static clib_error_t *
1999 tcp_src_address (vlib_main_t * vm,
2000 unformat_input_t * input, vlib_cli_command_t * cmd_arg)
2002 ip4_address_t v4start, v4end;
2003 ip6_address_t v6start, v6end;
2009 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2011 if (unformat (input, "%U - %U", unformat_ip4_address, &v4start,
2012 unformat_ip4_address, &v4end))
2014 else if (unformat (input, "%U", unformat_ip4_address, &v4start))
2016 memcpy (&v4end, &v4start, sizeof (v4start));
2019 else if (unformat (input, "%U - %U", unformat_ip6_address, &v6start,
2020 unformat_ip6_address, &v6end))
2022 else if (unformat (input, "%U", unformat_ip6_address, &v6start))
2024 memcpy (&v6end, &v6start, sizeof (v6start));
2027 else if (unformat (input, "fib-table %d", &table_id))
2033 if (!v4set && !v6set)
2034 return clib_error_return (0, "at least one v4 or v6 address required");
2038 rv = tcp_configure_v4_source_address_range (vm, &v4start, &v4end,
2045 case VNET_API_ERROR_NO_SUCH_FIB:
2046 return clib_error_return (0, "Invalid table-id %d", table_id);
2048 case VNET_API_ERROR_INVALID_ARGUMENT:
2049 return clib_error_return (0, "Invalid address range %U - %U",
2050 format_ip4_address, &v4start,
2051 format_ip4_address, &v4end);
2053 return clib_error_return (0, "error %d", rv);
2059 rv = tcp_configure_v6_source_address_range (vm, &v6start, &v6end,
2066 case VNET_API_ERROR_NO_SUCH_FIB:
2067 return clib_error_return (0, "Invalid table-id %d", table_id);
2070 return clib_error_return (0, "error %d", rv);
2078 VLIB_CLI_COMMAND (tcp_src_address_command, static) =
2080 .path = "tcp src-address",
2081 .short_help = "tcp src-address <ip-addr> [- <ip-addr>] add src address range",
2082 .function = tcp_src_address,
2087 tcp_scoreboard_dump_trace (u8 * s, sack_scoreboard_t * sb)
2089 #if TCP_SCOREBOARD_TRACE
2091 scoreboard_trace_elt_t *block;
2097 s = format (s, "scoreboard trace:");
2098 vec_foreach (block, sb->trace)
2100 s = format (s, "{%u, %u, %u, %u, %u}, ", block->start, block->end,
2101 block->ack, block->snd_una_max, block->group);
2103 s = format (s, "\n");
2111 static clib_error_t *
2112 tcp_show_scoreboard_trace_fn (vlib_main_t * vm, unformat_input_t * input,
2113 vlib_cli_command_t * cmd_arg)
2115 transport_connection_t *tconn = 0;
2116 tcp_connection_t *tc;
2118 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2120 if (unformat (input, "%U", unformat_transport_connection, &tconn,
2121 TRANSPORT_PROTO_TCP))
2124 return clib_error_return (0, "unknown input `%U'",
2125 format_unformat_error, input);
2128 if (!TCP_SCOREBOARD_TRACE)
2130 vlib_cli_output (vm, "scoreboard tracing not enabled");
2134 tc = tcp_get_connection_from_transport (tconn);
2135 s = tcp_scoreboard_dump_trace (s, &tc->sack_sb);
2136 vlib_cli_output (vm, "%v", s);
2141 VLIB_CLI_COMMAND (tcp_show_scoreboard_trace_command, static) =
2143 .path = "show tcp scoreboard trace",
2144 .short_help = "show tcp scoreboard trace <connection>",
2145 .function = tcp_show_scoreboard_trace_fn,
2150 tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose)
2153 scoreboard_trace_elt_t *trace;
2154 u32 next_ack, left, group, has_new_ack = 0;
2155 tcp_connection_t _dummy_tc, *dummy_tc = &_dummy_tc;
2156 sack_block_t *block;
2158 if (!TCP_SCOREBOARD_TRACE)
2160 s = format (s, "scoreboard tracing not enabled");
2167 clib_memset (dummy_tc, 0, sizeof (*dummy_tc));
2168 tcp_connection_timers_init (dummy_tc);
2169 scoreboard_init (&dummy_tc->sack_sb);
2170 dummy_tc->rcv_opts.flags |= TCP_OPTS_FLAG_SACK;
2172 #if TCP_SCOREBOARD_TRACE
2173 trace = tc->sack_sb.trace;
2174 trace_len = vec_len (tc->sack_sb.trace);
2177 for (i = 0; i < trace_len; i++)
2179 if (trace[i].ack != 0)
2181 dummy_tc->snd_una = trace[i].ack - 1448;
2182 dummy_tc->snd_una_max = trace[i].ack;
2187 while (left < trace_len)
2189 group = trace[left].group;
2190 vec_reset_length (dummy_tc->rcv_opts.sacks);
2192 while (trace[left].group == group)
2194 if (trace[left].ack != 0)
2197 s = format (s, "Adding ack %u, snd_una_max %u, segs: ",
2198 trace[left].ack, trace[left].snd_una_max);
2199 dummy_tc->snd_una_max = trace[left].snd_una_max;
2200 next_ack = trace[left].ack;
2206 s = format (s, "[%u, %u], ", trace[left].start,
2208 vec_add2 (dummy_tc->rcv_opts.sacks, block, 1);
2209 block->start = trace[left].start;
2210 block->end = trace[left].end;
2216 tcp_rcv_sacks (dummy_tc, next_ack);
2218 dummy_tc->snd_una = next_ack;
2221 s = format (s, "result: %U", format_tcp_scoreboard,
2222 &dummy_tc->sack_sb);
2225 s = format (s, "result: %U", format_tcp_scoreboard, &dummy_tc->sack_sb);
2230 static clib_error_t *
2231 tcp_scoreboard_trace_fn (vlib_main_t * vm, unformat_input_t * input,
2232 vlib_cli_command_t * cmd_arg)
2234 transport_connection_t *tconn = 0;
2235 tcp_connection_t *tc = 0;
2237 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2239 if (unformat (input, "%U", unformat_transport_connection, &tconn,
2240 TRANSPORT_PROTO_TCP))
2243 return clib_error_return (0, "unknown input `%U'",
2244 format_unformat_error, input);
2247 if (!TCP_SCOREBOARD_TRACE)
2249 vlib_cli_output (vm, "scoreboard tracing not enabled");
2253 tc = tcp_get_connection_from_transport (tconn);
2256 vlib_cli_output (vm, "connection not found");
2259 str = tcp_scoreboard_replay (str, tc, 1);
2260 vlib_cli_output (vm, "%v", str);
2265 VLIB_CLI_COMMAND (tcp_replay_scoreboard_command, static) =
2267 .path = "tcp replay scoreboard",
2268 .short_help = "tcp replay scoreboard <connection>",
2269 .function = tcp_scoreboard_trace_fn,
2273 static clib_error_t *
2274 show_tcp_punt_fn (vlib_main_t * vm, unformat_input_t * input,
2275 vlib_cli_command_t * cmd_arg)
2277 tcp_main_t *tm = vnet_get_tcp_main ();
2278 if (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2279 return clib_error_return (0, "unknown input `%U'", format_unformat_error,
2281 vlib_cli_output (vm, "IPv4 TCP punt: %s",
2282 tm->punt_unknown4 ? "enabled" : "disabled");
2283 vlib_cli_output (vm, "IPv6 TCP punt: %s",
2284 tm->punt_unknown6 ? "enabled" : "disabled");
2288 VLIB_CLI_COMMAND (show_tcp_punt_command, static) =
2290 .path = "show tcp punt",
2291 .short_help = "show tcp punt",
2292 .function = show_tcp_punt_fn,
2297 * fd.io coding-style-patch-verification: ON
2300 * eval: (c-set-style "gnu")