2 * Copyright (c) 2016 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>
32 tcp_connection_bind (u32 session_index, transport_endpoint_t * lcl)
34 tcp_main_t *tm = &tcp_main;
35 tcp_connection_t *listener;
37 pool_get (tm->listener_pool, listener);
38 memset (listener, 0, sizeof (*listener));
40 listener->c_c_index = listener - tm->listener_pool;
41 listener->c_lcl_port = clib_host_to_net_u16 (lcl->port);
45 listener->c_lcl_ip4.as_u32 = lcl->ip.ip4.as_u32;
46 listener->c_is_ip4 = 1;
50 clib_memcpy (&listener->c_lcl_ip6, &lcl->ip.ip6,
51 sizeof (ip6_address_t));
54 listener->c_transport_proto = TRANSPORT_PROTO_TCP;
55 listener->c_s_index = session_index;
56 listener->state = TCP_STATE_LISTEN;
58 tcp_connection_timers_init (listener);
60 TCP_EVT_DBG (TCP_EVT_BIND, listener);
62 return listener->c_c_index;
66 tcp_session_bind (u32 session_index, transport_endpoint_t * tep)
68 return tcp_connection_bind (session_index, tep);
72 tcp_connection_unbind (u32 listener_index)
74 tcp_main_t *tm = vnet_get_tcp_main ();
77 tc = pool_elt_at_index (tm->listener_pool, listener_index);
79 TCP_EVT_DBG (TCP_EVT_UNBIND, tc);
81 /* Poison the entry */
83 memset (tc, 0xFA, sizeof (*tc));
85 pool_put_index (tm->listener_pool, listener_index);
89 tcp_session_unbind (u32 listener_index)
91 tcp_connection_unbind (listener_index);
95 transport_connection_t *
96 tcp_session_get_listener (u32 listener_index)
98 tcp_main_t *tm = vnet_get_tcp_main ();
100 tc = pool_elt_at_index (tm->listener_pool, listener_index);
101 return &tc->connection;
105 transport_endpoint_del (u32 tepi)
107 tcp_main_t *tm = vnet_get_tcp_main ();
108 clib_spinlock_lock_if_init (&tm->local_endpoints_lock);
109 pool_put_index (tm->local_endpoints, tepi);
110 clib_spinlock_unlock_if_init (&tm->local_endpoints_lock);
113 always_inline transport_endpoint_t *
114 transport_endpoint_new (void)
116 tcp_main_t *tm = vnet_get_tcp_main ();
117 transport_endpoint_t *tep;
118 pool_get (tm->local_endpoints, tep);
123 * Cleanup half-open connection
127 tcp_half_open_connection_del (tcp_connection_t * tc)
129 tcp_main_t *tm = vnet_get_tcp_main ();
130 clib_spinlock_lock_if_init (&tm->half_open_lock);
131 pool_put_index (tm->half_open_connections, tc->c_c_index);
133 memset (tc, 0xFA, sizeof (*tc));
134 clib_spinlock_unlock_if_init (&tm->half_open_lock);
138 * Try to cleanup half-open connection
140 * If called from a thread that doesn't own tc, the call won't have any
143 * @param tc - connection to be cleaned up
144 * @return non-zero if cleanup failed.
147 tcp_half_open_connection_cleanup (tcp_connection_t * tc)
149 /* Make sure this is the owning thread */
150 if (tc->c_thread_index != vlib_get_thread_index ())
152 tcp_timer_reset (tc, TCP_TIMER_ESTABLISH);
153 tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT_SYN);
154 tcp_half_open_connection_del (tc);
159 tcp_half_open_connection_new (void)
161 tcp_main_t *tm = vnet_get_tcp_main ();
162 tcp_connection_t *tc = 0;
163 pool_get (tm->half_open_connections, tc);
164 memset (tc, 0, sizeof (*tc));
165 tc->c_c_index = tc - tm->half_open_connections;
170 * Cleans up connection state.
175 tcp_connection_cleanup (tcp_connection_t * tc)
177 tcp_main_t *tm = &tcp_main;
179 transport_endpoint_t *tep;
181 /* Cleanup local endpoint if this was an active connect */
182 tepi = transport_endpoint_lookup (&tm->local_endpoints_table, &tc->c_lcl_ip,
183 clib_net_to_host_u16 (tc->c_lcl_port));
184 if (tepi != TRANSPORT_ENDPOINT_INVALID_INDEX)
186 tep = pool_elt_at_index (tm->local_endpoints, tepi);
187 transport_endpoint_table_del (&tm->local_endpoints_table, tep);
188 transport_endpoint_del (tepi);
191 /* Check if connection is not yet fully established */
192 if (tc->state == TCP_STATE_SYN_SENT)
194 /* Try to remove the half-open connection. If this is not the owning
195 * thread, tc won't be removed. Retransmit or establish timers will
196 * eventually expire and call again cleanup on the right thread. */
197 tcp_half_open_connection_cleanup (tc);
201 int thread_index = tc->c_thread_index;
203 /* Make sure all timers are cleared */
204 tcp_connection_timers_reset (tc);
206 /* Poison the entry */
208 memset (tc, 0xFA, sizeof (*tc));
209 pool_put (tm->connections[thread_index], tc);
214 * Connection removal.
216 * This should be called only once connection enters CLOSED state. Note
217 * that it notifies the session of the removal event, so if the goal is to
218 * just remove the connection, call tcp_connection_cleanup instead.
221 tcp_connection_del (tcp_connection_t * tc)
223 TCP_EVT_DBG (TCP_EVT_DELETE, tc);
224 stream_session_delete_notify (&tc->connection);
225 tcp_connection_cleanup (tc);
229 tcp_connection_new (u8 thread_index)
231 tcp_main_t *tm = vnet_get_tcp_main ();
232 tcp_connection_t *tc;
234 pool_get (tm->connections[thread_index], tc);
235 memset (tc, 0, sizeof (*tc));
236 tc->c_c_index = tc - tm->connections[thread_index];
237 tc->c_thread_index = thread_index;
241 /** Notify session that connection has been reset.
243 * Switch state to closed and wait for session to call cleanup.
246 tcp_connection_reset (tcp_connection_t * tc)
248 TCP_EVT_DBG (TCP_EVT_RST_RCVD, tc);
251 case TCP_STATE_SYN_RCVD:
252 /* Cleanup everything. App wasn't notified yet */
253 stream_session_delete_notify (&tc->connection);
254 tcp_connection_cleanup (tc);
256 case TCP_STATE_SYN_SENT:
257 stream_session_connect_notify (&tc->connection, 1 /* fail */ );
258 tcp_connection_cleanup (tc);
260 case TCP_STATE_ESTABLISHED:
261 case TCP_STATE_CLOSE_WAIT:
262 case TCP_STATE_FIN_WAIT_1:
263 case TCP_STATE_FIN_WAIT_2:
264 case TCP_STATE_CLOSING:
265 tc->state = TCP_STATE_CLOSED;
266 TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc);
268 /* Make sure all timers are cleared */
269 tcp_connection_timers_reset (tc);
270 stream_session_reset_notify (&tc->connection);
272 /* Wait for cleanup from session layer but not forever */
273 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
275 case TCP_STATE_CLOSED:
281 * Begin connection closing procedure.
283 * If at the end the connection is not in CLOSED state, it is not removed.
284 * Instead, we rely on on TCP to advance through state machine to either
285 * 1) LAST_ACK (passive close) whereby when the last ACK is received
286 * tcp_connection_del is called. This notifies session of the delete and
288 * 2) TIME_WAIT (active close) whereby after 2MSL the 2MSL timer triggers
289 * and cleanup is called.
291 * N.B. Half-close connections are not supported
294 tcp_connection_close (tcp_connection_t * tc)
296 TCP_EVT_DBG (TCP_EVT_CLOSE, tc);
298 /* Send/Program FIN if needed and switch state */
301 case TCP_STATE_SYN_SENT:
302 tc->state = TCP_STATE_CLOSED;
304 case TCP_STATE_SYN_RCVD:
306 tc->state = TCP_STATE_FIN_WAIT_1;
308 case TCP_STATE_ESTABLISHED:
309 if (!stream_session_tx_fifo_max_dequeue (&tc->connection))
312 tc->flags |= TCP_CONN_FINPNDG;
313 tc->state = TCP_STATE_FIN_WAIT_1;
315 case TCP_STATE_CLOSE_WAIT:
317 tc->state = TCP_STATE_LAST_ACK;
320 clib_warning ("shouldn't be here");
323 TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc);
325 /* If in CLOSED and WAITCLOSE timer is not set, delete connection now */
326 if (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID
327 && tc->state == TCP_STATE_CLOSED)
328 tcp_connection_del (tc);
332 tcp_session_close (u32 conn_index, u32 thread_index)
334 tcp_connection_t *tc;
335 tc = tcp_connection_get (conn_index, thread_index);
336 tcp_connection_close (tc);
340 tcp_session_cleanup (u32 conn_index, u32 thread_index)
342 tcp_connection_t *tc;
343 tc = tcp_connection_get (conn_index, thread_index);
345 /* Wait for the session tx events to clear */
346 tc->state = TCP_STATE_CLOSED;
347 TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc);
348 tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
352 ip_interface_get_first_ip (u32 sw_if_index, u8 is_ip4)
354 ip_lookup_main_t *lm4 = &ip4_main.lookup_main;
355 ip_lookup_main_t *lm6 = &ip6_main.lookup_main;
356 ip_interface_address_t *ia = 0;
361 foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* unnumbered */ ,
363 return ip_interface_address_get_address (lm4, ia);
370 foreach_ip_interface_address (lm6, ia, sw_if_index, 1 /* unnumbered */ ,
373 rv = ip_interface_address_get_address (lm6, ia);
374 /* Trying to use a link-local ip6 src address is a fool's errand */
375 if (!ip6_address_is_link_local_unicast (rv))
384 #define PORT_MASK ((1 << 16)- 1)
386 * Allocate local port and add if successful add entry to local endpoint
387 * table to mark the pair as used.
390 tcp_allocate_local_port (ip46_address_t * ip)
392 tcp_main_t *tm = vnet_get_tcp_main ();
393 transport_endpoint_t *tep;
395 u16 min = 1024, max = 65535; /* XXX configurable ? */
400 /* Only support active opens from thread 0 */
401 ASSERT (vlib_get_thread_index () == 0);
403 /* Search for first free slot */
404 for (tries = 0; tries < limit; tries++)
408 /* Find a port in the specified range */
411 port = random_u32 (&tm->port_allocator_seed) & PORT_MASK;
412 if (PREDICT_TRUE (port >= min && port < max))
417 tei = transport_endpoint_lookup (&tm->local_endpoints_table, ip, port);
418 /* If not found, we're done */
419 if (tei == TRANSPORT_ENDPOINT_INVALID_INDEX)
421 clib_spinlock_lock_if_init (&tm->local_endpoints_lock);
422 tep = transport_endpoint_new ();
423 clib_memcpy (&tep->ip, ip, sizeof (*ip));
425 transport_endpoint_table_add (&tm->local_endpoints_table, tep,
426 tep - tm->local_endpoints);
427 clib_spinlock_unlock_if_init (&tm->local_endpoints_lock);
436 * Initialize all connection timers as invalid
439 tcp_connection_timers_init (tcp_connection_t * tc)
443 /* Set all to invalid */
444 for (i = 0; i < TCP_N_TIMERS; i++)
446 tc->timers[i] = TCP_TIMER_HANDLE_INVALID;
449 tc->rto = TCP_RTO_INIT;
453 * Stop all connection timers
456 tcp_connection_timers_reset (tcp_connection_t * tc)
459 for (i = 0; i < TCP_N_TIMERS; i++)
461 tcp_timer_reset (tc, i);
466 typedef struct ip4_tcp_hdr
472 typedef struct ip6_tcp_hdr
479 tcp_connection_select_lb_bucket (tcp_connection_t * tc, const dpo_id_t * dpo,
482 const dpo_id_t *choice;
486 lb = load_balance_get (dpo->dpoi_index);
490 memset (&hdr, 0, sizeof (hdr));
491 hdr.ip.protocol = IP_PROTOCOL_TCP;
492 hdr.ip.address_pair.src.as_u32 = tc->c_lcl_ip.ip4.as_u32;
493 hdr.ip.address_pair.dst.as_u32 = tc->c_rmt_ip.ip4.as_u32;
494 hdr.tcp.src_port = tc->c_lcl_port;
495 hdr.tcp.dst_port = tc->c_rmt_port;
496 hash = ip4_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
501 memset (&hdr, 0, sizeof (hdr));
502 hdr.ip.protocol = IP_PROTOCOL_TCP;
503 clib_memcpy (&hdr.ip.src_address, &tc->c_lcl_ip.ip6,
504 sizeof (ip6_address_t));
505 clib_memcpy (&hdr.ip.dst_address, &tc->c_rmt_ip.ip6,
506 sizeof (ip6_address_t));
507 hdr.tcp.src_port = tc->c_lcl_port;
508 hdr.tcp.dst_port = tc->c_rmt_port;
509 hash = ip6_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
511 choice = load_balance_get_bucket_i (lb, hash & lb->lb_n_buckets_minus_1);
512 dpo_copy (result, choice);
516 tcp_lookup_rmt_in_fib (tcp_connection_t * tc)
521 clib_memcpy (&prefix.fp_addr, &tc->c_rmt_ip, sizeof (prefix.fp_addr));
522 prefix.fp_proto = tc->c_is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
523 prefix.fp_len = tc->c_is_ip4 ? 32 : 128;
524 fib_index = fib_table_find (prefix.fp_proto, tc->c_vrf);
525 return fib_table_lookup (fib_index, &prefix);
529 tcp_connection_stack_on_fib_entry (tcp_connection_t * tc)
531 dpo_id_t choice = DPO_INVALID;
532 u32 output_node_index;
535 fe = fib_entry_get (tc->c_rmt_fei);
536 if (fe->fe_lb.dpoi_type != DPO_LOAD_BALANCE)
539 tcp_connection_select_lb_bucket (tc, &fe->fe_lb, &choice);
542 tc->c_is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
543 dpo_stack_from_node (output_node_index, &tc->c_rmt_dpo, &choice);
547 /** Stack tcp connection on peer's fib entry.
549 * This ultimately populates the dpo the connection will use to send packets.
552 tcp_connection_fib_attach (tcp_connection_t * tc)
554 tc->c_rmt_fei = tcp_lookup_rmt_in_fib (tc);
556 ASSERT (tc->c_rmt_fei != FIB_NODE_INDEX_INVALID);
558 tcp_connection_stack_on_fib_entry (tc);
562 /** Initialize tcp connection variables
564 * Should be called after having received a msg from the peer, i.e., a SYN or
565 * a SYNACK, such that connection options have already been exchanged. */
567 tcp_connection_init_vars (tcp_connection_t * tc)
569 tcp_connection_timers_init (tc);
571 scoreboard_init (&tc->sack_sb);
573 // tcp_connection_fib_attach (tc);
577 tcp_connection_open (transport_endpoint_t * rmt)
579 tcp_main_t *tm = vnet_get_tcp_main ();
580 tcp_connection_t *tc;
582 fib_node_index_t fei;
583 u32 sw_if_index, fib_index;
584 ip46_address_t lcl_addr;
588 * Find the local address and allocate port
590 memset (&lcl_addr, 0, sizeof (lcl_addr));
592 /* Find a FIB path to the destination */
593 clib_memcpy (&prefix.fp_addr, &rmt->ip, sizeof (rmt->ip));
594 prefix.fp_proto = rmt->is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
595 prefix.fp_len = rmt->is_ip4 ? 32 : 128;
597 fib_index = fib_table_find (prefix.fp_proto, rmt->vrf);
598 if (fib_index == (u32) ~ 0)
600 clib_warning ("no fib table");
604 fei = fib_table_lookup (fib_index, &prefix);
606 /* Couldn't find route to destination. Bail out. */
607 if (fei == FIB_NODE_INDEX_INVALID)
609 clib_warning ("no route to destination");
613 sw_if_index = fib_entry_get_resolving_interface (fei);
615 if (sw_if_index == (u32) ~ 0)
617 clib_warning ("no resolving interface for %U", format_ip46_address,
618 &rmt->ip, IP46_TYPE_IP4);
626 if (vec_len (tm->ip4_src_addresses))
628 index = tm->last_v4_address_rotor++;
629 if (tm->last_v4_address_rotor >= vec_len (tm->ip4_src_addresses))
630 tm->last_v4_address_rotor = 0;
631 lcl_addr.ip4.as_u32 = tm->ip4_src_addresses[index].as_u32;
635 ip4 = ip_interface_get_first_ip (sw_if_index, 1);
636 lcl_addr.ip4.as_u32 = ip4->as_u32;
644 if (vec_len (tm->ip6_src_addresses))
646 index = tm->last_v6_address_rotor++;
647 if (tm->last_v6_address_rotor >= vec_len (tm->ip6_src_addresses))
648 tm->last_v6_address_rotor = 0;
649 clib_memcpy (&lcl_addr.ip6, &tm->ip6_src_addresses[index],
654 ip6 = ip_interface_get_first_ip (sw_if_index, 0);
657 clib_warning ("no routable ip6 addresses on %U",
658 format_vnet_sw_if_index_name, vnet_get_main (),
663 clib_memcpy (&lcl_addr.ip6, ip6, sizeof (*ip6));
667 /* Allocate source port */
668 lcl_port = tcp_allocate_local_port (&lcl_addr);
671 clib_warning ("Failed to allocate src port");
676 * Create connection and send SYN
678 clib_spinlock_lock_if_init (&tm->half_open_lock);
679 tc = tcp_half_open_connection_new ();
680 clib_memcpy (&tc->c_rmt_ip, &rmt->ip, sizeof (ip46_address_t));
681 clib_memcpy (&tc->c_lcl_ip, &lcl_addr, sizeof (ip46_address_t));
682 tc->c_rmt_port = clib_host_to_net_u16 (rmt->port);
683 tc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
684 tc->c_is_ip4 = rmt->is_ip4;
685 tc->c_transport_proto = TRANSPORT_PROTO_TCP;
686 tc->c_vrf = rmt->vrf;
687 /* The other connection vars will be initialized after SYN ACK */
688 tcp_connection_timers_init (tc);
690 TCP_EVT_DBG (TCP_EVT_OPEN, tc);
691 tc->state = TCP_STATE_SYN_SENT;
693 clib_spinlock_unlock_if_init (&tm->half_open_lock);
695 return tc->c_c_index;
699 tcp_session_open (transport_endpoint_t * tep)
701 return tcp_connection_open (tep);
704 const char *tcp_dbg_evt_str[] = {
705 #define _(sym, str) str,
710 const char *tcp_fsm_states[] = {
711 #define _(sym, str) str,
712 foreach_tcp_fsm_state
717 format_tcp_state (u8 * s, va_list * args)
719 u32 state = va_arg (*args, u32);
721 if (state < TCP_N_STATES)
722 s = format (s, "%s", tcp_fsm_states[state]);
724 s = format (s, "UNKNOWN (%d (0x%x))", state, state);
728 const char *tcp_conn_timers[] = {
729 #define _(sym, str) str,
735 format_tcp_timers (u8 * s, va_list * args)
737 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
740 for (i = 0; i < TCP_N_TIMERS; i++)
741 if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID)
745 for (i = 0; i < last; i++)
747 if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID)
748 s = format (s, "%s,", tcp_conn_timers[i]);
752 s = format (s, "%s]", tcp_conn_timers[i]);
760 format_tcp_congestion_status (u8 * s, va_list * args)
762 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
763 if (tcp_in_recovery (tc))
764 s = format (s, "recovery");
765 else if (tcp_in_fastrecovery (tc))
766 s = format (s, "fastrecovery");
768 s = format (s, "none");
773 format_tcp_vars (u8 * s, va_list * args)
775 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
776 s = format (s, " snd_una %u snd_nxt %u snd_una_max %u",
777 tc->snd_una - tc->iss, tc->snd_nxt - tc->iss,
778 tc->snd_una_max - tc->iss);
779 s = format (s, " rcv_nxt %u rcv_las %u\n",
780 tc->rcv_nxt - tc->irs, tc->rcv_las - tc->irs);
781 s = format (s, " snd_wnd %u rcv_wnd %u snd_wl1 %u snd_wl2 %u\n",
782 tc->snd_wnd, tc->rcv_wnd, tc->snd_wl1 - tc->irs,
783 tc->snd_wl2 - tc->iss);
784 s = format (s, " flight size %u send space %u rcv_wnd_av %d\n",
785 tcp_flight_size (tc), tcp_available_snd_space (tc),
786 tcp_rcv_wnd_available (tc));
787 s = format (s, " cong %U ", format_tcp_congestion_status, tc);
788 s = format (s, "cwnd %u ssthresh %u rtx_bytes %u bytes_acked %u\n",
789 tc->cwnd, tc->ssthresh, tc->snd_rxt_bytes, tc->bytes_acked);
790 s = format (s, " prev_ssthresh %u snd_congestion %u dupack %u",
791 tc->prev_ssthresh, tc->snd_congestion - tc->iss,
793 s = format (s, " limited_transmit %u\n", tc->limited_transmit - tc->iss);
794 s = format (s, " tsecr %u tsecr_last_ack %u\n", tc->rcv_opts.tsecr,
796 s = format (s, " rto %u rto_boff %u srtt %u rttvar %u rtt_ts %u ", tc->rto,
797 tc->rto_boff, tc->srtt, tc->rttvar, tc->rtt_ts);
798 s = format (s, "rtt_seq %u\n", tc->rtt_seq);
799 s = format (s, " tsval_recent %u tsval_recent_age %u\n", tc->tsval_recent,
800 tcp_time_now () - tc->tsval_recent_age);
801 s = format (s, " scoreboard: %U\n", format_tcp_scoreboard, &tc->sack_sb);
802 if (vec_len (tc->snd_sacks))
803 s = format (s, " sacks tx: %U\n", format_tcp_sacks, tc);
809 format_tcp_connection_id (u8 * s, va_list * args)
811 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
816 s = format (s, "[#%d][%s] %U:%d->%U:%d", tc->c_thread_index, "T",
817 format_ip4_address, &tc->c_lcl_ip4,
818 clib_net_to_host_u16 (tc->c_lcl_port), format_ip4_address,
819 &tc->c_rmt_ip4, clib_net_to_host_u16 (tc->c_rmt_port));
823 s = format (s, "[#%d][%s] %U:%d->%U:%d", tc->c_thread_index, "T",
824 format_ip6_address, &tc->c_lcl_ip6,
825 clib_net_to_host_u16 (tc->c_lcl_port), format_ip6_address,
826 &tc->c_rmt_ip6, clib_net_to_host_u16 (tc->c_rmt_port));
833 format_tcp_connection (u8 * s, va_list * args)
835 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
836 u32 verbose = va_arg (*args, u32);
838 s = format (s, "%-50U", format_tcp_connection_id, tc);
841 s = format (s, "%-15U", format_tcp_state, tc->state);
843 s = format (s, " %U\n%U", format_tcp_timers, tc, format_tcp_vars, tc);
850 format_tcp_session (u8 * s, va_list * args)
852 u32 tci = va_arg (*args, u32);
853 u32 thread_index = va_arg (*args, u32);
854 u32 verbose = va_arg (*args, u32);
855 tcp_connection_t *tc;
857 tc = tcp_connection_get (tci, thread_index);
859 s = format (s, "%U", format_tcp_connection, tc, verbose);
861 s = format (s, "empty");
866 format_tcp_listener_session (u8 * s, va_list * args)
868 u32 tci = va_arg (*args, u32);
869 tcp_connection_t *tc = tcp_listener_get (tci);
870 return format (s, "%U", format_tcp_connection_id, tc);
874 format_tcp_half_open_session (u8 * s, va_list * args)
876 u32 tci = va_arg (*args, u32);
877 tcp_connection_t *tc = tcp_half_open_connection_get (tci);
878 return format (s, "%U", format_tcp_connection_id, tc);
882 format_tcp_sacks (u8 * s, va_list * args)
884 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
885 sack_block_t *sacks = tc->snd_sacks;
889 len = vec_len (sacks);
890 for (i = 0; i < len - 1; i++)
893 s = format (s, " start %u end %u\n", block->start - tc->irs,
894 block->end - tc->irs);
898 block = &sacks[len - 1];
899 s = format (s, " start %u end %u", block->start - tc->irs,
900 block->end - tc->irs);
906 format_tcp_rcv_sacks (u8 * s, va_list * args)
908 tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
909 sack_block_t *sacks = tc->rcv_opts.sacks;
913 len = vec_len (sacks);
914 for (i = 0; i < len - 1; i++)
917 s = format (s, " start %u end %u\n", block->start - tc->iss,
918 block->end - tc->iss);
922 block = &sacks[len - 1];
923 s = format (s, " start %u end %u", block->start - tc->iss,
924 block->end - tc->iss);
930 format_tcp_sack_hole (u8 * s, va_list * args)
932 sack_scoreboard_hole_t *hole = va_arg (*args, sack_scoreboard_hole_t *);
933 s = format (s, "[%u, %u]", hole->start, hole->end);
938 format_tcp_scoreboard (u8 * s, va_list * args)
940 sack_scoreboard_t *sb = va_arg (*args, sack_scoreboard_t *);
941 sack_scoreboard_hole_t *hole;
942 s = format (s, "sacked_bytes %u last_sacked_bytes %u lost_bytes %u\n",
943 sb->sacked_bytes, sb->last_sacked_bytes, sb->lost_bytes);
944 s = format (s, " last_bytes_delivered %u high_sacked %u snd_una_adv %u\n",
945 sb->last_bytes_delivered, sb->high_sacked, sb->snd_una_adv);
946 s = format (s, " cur_rxt_hole %u high_rxt %u rescue_rxt %u",
947 sb->cur_rxt_hole, sb->high_rxt, sb->rescue_rxt);
949 hole = scoreboard_first_hole (sb);
951 s = format (s, "\n head %u tail %u holes:\n", sb->head, sb->tail);
955 s = format (s, "%U", format_tcp_sack_hole, hole);
956 hole = scoreboard_next_hole (sb, hole);
962 transport_connection_t *
963 tcp_session_get_transport (u32 conn_index, u32 thread_index)
965 tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index);
966 return &tc->connection;
969 transport_connection_t *
970 tcp_half_open_session_get_transport (u32 conn_index)
972 tcp_connection_t *tc = tcp_half_open_connection_get (conn_index);
973 return &tc->connection;
977 * Compute maximum segment size for session layer.
979 * Since the result needs to be the actual data length, it first computes
980 * the tcp options to be used in the next burst and subtracts their
981 * length from the connection's snd_mss.
984 tcp_session_send_mss (transport_connection_t * trans_conn)
986 tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
988 /* Ensure snd_mss does accurately reflect the amount of data we can push
989 * in a segment. This also makes sure that options are updated according to
990 * the current state of the connection. */
991 tcp_update_snd_mss (tc);
997 tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space)
999 if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
1001 return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0;
1004 /* If we can't write at least a segment, don't try at all */
1005 if (PREDICT_FALSE (snd_space < tc->snd_mss))
1007 if (snd_space > clib_min (tc->mss, tc->rcv_opts.mss) - TCP_HDR_LEN_MAX)
1012 /* round down to mss multiple */
1013 return snd_space - (snd_space % tc->snd_mss);
1017 * Compute tx window session is allowed to fill.
1019 * Takes into account available send space, snd_mss and the congestion
1020 * state of the connection. If possible, the value returned is a multiple
1023 * @param tc tcp connection
1024 * @return number of bytes session is allowed to write
1027 tcp_snd_space (tcp_connection_t * tc)
1029 int snd_space, snt_limited;
1031 if (PREDICT_TRUE (tcp_in_cong_recovery (tc) == 0))
1033 snd_space = tcp_available_snd_space (tc);
1035 /* If we haven't gotten dupacks or if we did and have gotten sacked
1036 * bytes then we can still send as per Limited Transmit (RFC3042) */
1037 if (PREDICT_FALSE (tc->rcv_dupacks != 0
1038 && (tcp_opts_sack_permitted (tc)
1039 && tc->sack_sb.last_sacked_bytes == 0)))
1041 if (tc->rcv_dupacks == 1 && tc->limited_transmit != tc->snd_nxt)
1042 tc->limited_transmit = tc->snd_nxt;
1043 ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt));
1045 snt_limited = tc->snd_nxt - tc->limited_transmit;
1046 snd_space = clib_max (2 * tc->snd_mss - snt_limited, 0);
1048 return tcp_round_snd_space (tc, snd_space);
1051 if (tcp_in_recovery (tc))
1053 tc->snd_nxt = tc->snd_una_max;
1054 snd_space = tcp_available_wnd (tc) - tc->snd_rxt_bytes
1055 - (tc->snd_una_max - tc->snd_congestion);
1056 if (snd_space <= 0 || (tc->snd_una_max - tc->snd_una) >= tc->snd_wnd)
1058 return tcp_round_snd_space (tc, snd_space);
1061 /* If in fast recovery, send 1 SMSS if wnd allows */
1062 if (tcp_in_fastrecovery (tc)
1063 && tcp_available_snd_space (tc) && !tcp_fastrecovery_sent_1_smss (tc))
1065 tcp_fastrecovery_1_smss_on (tc);
1073 tcp_session_send_space (transport_connection_t * trans_conn)
1075 tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1076 return tcp_snd_space (tc);
1080 tcp_rcv_wnd_available (tcp_connection_t * tc)
1082 return (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
1086 tcp_session_tx_fifo_offset (transport_connection_t * trans_conn)
1088 tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1090 ASSERT (seq_geq (tc->snd_nxt, tc->snd_una));
1092 /* This still works if fast retransmit is on */
1093 return (tc->snd_nxt - tc->snd_una);
1097 const static transport_proto_vft_t tcp_proto = {
1098 .bind = tcp_session_bind,
1099 .unbind = tcp_session_unbind,
1100 .push_header = tcp_push_header,
1101 .get_connection = tcp_session_get_transport,
1102 .get_listener = tcp_session_get_listener,
1103 .get_half_open = tcp_half_open_session_get_transport,
1104 .open = tcp_session_open,
1105 .close = tcp_session_close,
1106 .cleanup = tcp_session_cleanup,
1107 .send_mss = tcp_session_send_mss,
1108 .send_space = tcp_session_send_space,
1109 .tx_fifo_offset = tcp_session_tx_fifo_offset,
1110 .format_connection = format_tcp_session,
1111 .format_listener = format_tcp_listener_session,
1112 .format_half_open = format_tcp_half_open_session,
1117 tcp_timer_keep_handler (u32 conn_index)
1119 u32 thread_index = vlib_get_thread_index ();
1120 tcp_connection_t *tc;
1122 tc = tcp_connection_get (conn_index, thread_index);
1123 tc->timers[TCP_TIMER_KEEP] = TCP_TIMER_HANDLE_INVALID;
1125 tcp_connection_close (tc);
1129 tcp_timer_establish_handler (u32 conn_index)
1131 tcp_connection_t *tc;
1133 tc = tcp_half_open_connection_get (conn_index);
1136 ASSERT (tc->state == TCP_STATE_SYN_SENT);
1137 stream_session_connect_notify (&tc->connection, 1 /* fail */ );
1141 tc = tcp_connection_get (conn_index, vlib_get_thread_index ());
1142 ASSERT (tc->state == TCP_STATE_SYN_RCVD);
1144 tc->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
1145 tcp_connection_cleanup (tc);
1149 tcp_timer_waitclose_handler (u32 conn_index)
1151 u32 thread_index = vlib_get_thread_index ();
1152 tcp_connection_t *tc;
1154 tc = tcp_connection_get (conn_index, thread_index);
1157 tc->timers[TCP_TIMER_WAITCLOSE] = TCP_TIMER_HANDLE_INVALID;
1159 /* Session didn't come back with a close(). Send FIN either way
1160 * and switch to LAST_ACK. */
1161 if (tc->state == TCP_STATE_CLOSE_WAIT)
1163 if (tc->flags & TCP_CONN_FINSNT)
1165 clib_warning ("FIN was sent and still in CLOSE WAIT. Weird!");
1169 tc->state = TCP_STATE_LAST_ACK;
1171 /* Make sure we don't wait in LAST ACK forever */
1172 tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
1174 /* Don't delete the connection yet */
1178 tcp_connection_del (tc);
1182 static timer_expiration_handler *timer_expiration_handlers[TCP_N_TIMERS] =
1184 tcp_timer_retransmit_handler,
1185 tcp_timer_delack_handler,
1186 tcp_timer_persist_handler,
1187 tcp_timer_keep_handler,
1188 tcp_timer_waitclose_handler,
1189 tcp_timer_retransmit_syn_handler,
1190 tcp_timer_establish_handler
1195 tcp_expired_timers_dispatch (u32 * expired_timers)
1198 u32 connection_index, timer_id;
1200 for (i = 0; i < vec_len (expired_timers); i++)
1202 /* Get session index and timer id */
1203 connection_index = expired_timers[i] & 0x0FFFFFFF;
1204 timer_id = expired_timers[i] >> 28;
1206 TCP_EVT_DBG (TCP_EVT_TIMER_POP, connection_index, timer_id);
1208 /* Handle expiration */
1209 (*timer_expiration_handlers[timer_id]) (connection_index);
1214 tcp_initialize_timer_wheels (tcp_main_t * tm)
1216 tw_timer_wheel_16t_2w_512sl_t *tw;
1218 foreach_vlib_main (({
1219 tw = &tm->timer_wheels[ii];
1220 tw_timer_wheel_init_16t_2w_512sl (tw, tcp_expired_timers_dispatch,
1221 100e-3 /* timer period 100ms */ , ~0);
1222 tw->last_run_time = vlib_time_now (this_vlib_main);
1228 tcp_main_enable (vlib_main_t * vm)
1230 tcp_main_t *tm = vnet_get_tcp_main ();
1231 ip_protocol_info_t *pi;
1232 ip_main_t *im = &ip_main;
1233 vlib_thread_main_t *vtm = vlib_get_thread_main ();
1234 clib_error_t *error = 0;
1237 tcp_connection_t *tc __attribute__ ((unused));
1238 u32 preallocated_connections_per_thread;
1240 if ((error = vlib_call_init_function (vm, ip_main_init)))
1242 if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
1244 if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
1251 /* Register with IP */
1252 pi = ip_get_protocol_info (im, IP_PROTOCOL_TCP);
1254 return clib_error_return (0, "TCP protocol info AWOL");
1255 pi->format_header = format_tcp_header;
1256 pi->unformat_pg_edit = unformat_pg_tcp_header;
1258 ip4_register_protocol (IP_PROTOCOL_TCP, tcp4_input_node.index);
1259 ip6_register_protocol (IP_PROTOCOL_TCP, tcp6_input_node.index);
1261 /* Register as transport with session layer */
1262 session_register_transport (TRANSPORT_PROTO_TCP, 1, &tcp_proto);
1263 session_register_transport (TRANSPORT_PROTO_TCP, 0, &tcp_proto);
1266 * Initialize data structures
1269 num_threads = 1 /* main thread */ + vtm->n_threads;
1270 vec_validate (tm->connections, num_threads - 1);
1273 * Preallocate connections. Assume that thread 0 won't
1274 * use preallocated threads when running multi-core
1276 if (num_threads == 1)
1279 preallocated_connections_per_thread = tm->preallocated_connections;
1284 preallocated_connections_per_thread =
1285 tm->preallocated_connections / (num_threads - 1);
1287 for (; thread < num_threads; thread++)
1289 for (i = 0; i < preallocated_connections_per_thread; i++)
1290 pool_get (tm->connections[thread], tc);
1292 for (i = 0; i < preallocated_connections_per_thread; i++)
1293 pool_put_index (tm->connections[thread], i);
1297 * Preallocate half-open connections
1299 for (i = 0; i < tm->preallocated_half_open_connections; i++)
1300 pool_get (tm->half_open_connections, tc);
1302 for (i = 0; i < tm->preallocated_half_open_connections; i++)
1303 pool_put_index (tm->half_open_connections, i);
1305 /* Initialize per worker thread tx buffers (used for control messages) */
1306 vec_validate (tm->tx_buffers, num_threads - 1);
1308 /* Initialize timer wheels */
1309 vec_validate (tm->timer_wheels, num_threads - 1);
1310 tcp_initialize_timer_wheels (tm);
1312 /* Initialize clocks per tick for TCP timestamp. Used to compute
1313 * monotonically increasing timestamps. */
1314 tm->tstamp_ticks_per_clock = vm->clib_time.seconds_per_clock
1315 / TCP_TSTAMP_RESOLUTION;
1317 clib_bihash_init_24_8 (&tm->local_endpoints_table, "local endpoint table",
1318 1000000 /* $$$$ config parameter nbuckets */ ,
1319 (512 << 20) /*$$$ config parameter table size */ );
1321 /* Initialize [port-allocator] random number seed */
1322 tm->port_allocator_seed = (u32) clib_cpu_time_now ();
1324 if (num_threads > 1)
1326 clib_spinlock_init (&tm->half_open_lock);
1327 clib_spinlock_init (&tm->local_endpoints_lock);
1330 vec_validate (tm->tx_frames[0], num_threads - 1);
1331 vec_validate (tm->tx_frames[1], num_threads - 1);
1333 tm->bytes_per_buffer = vlib_buffer_free_list_buffer_size
1334 (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
1336 vec_validate (tm->time_now, num_threads - 1);
1341 vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en)
1345 if (tcp_main.is_enabled)
1348 return tcp_main_enable (vm);
1352 tcp_main.is_enabled = 0;
1359 tcp_init (vlib_main_t * vm)
1361 tcp_main_t *tm = vnet_get_tcp_main ();
1363 tcp_api_reference ();
1367 VLIB_INIT_FUNCTION (tcp_init);
1369 static clib_error_t *
1370 tcp_config_fn (vlib_main_t * vm, unformat_input_t * input)
1372 tcp_main_t *tm = vnet_get_tcp_main ();
1374 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1377 (input, "preallocated-connections %d",
1378 &tm->preallocated_connections))
1380 else if (unformat (input, "preallocated-half-open-connections %d",
1381 &tm->preallocated_half_open_connections))
1384 return clib_error_return (0, "unknown input `%U'",
1385 format_unformat_error, input);
1390 VLIB_CONFIG_FUNCTION (tcp_config_fn, "tcp");
1394 * \brief Configure an ipv4 source address range
1395 * @param vm vlib_main_t pointer
1396 * @param start first ipv4 address in the source address range
1397 * @param end last ipv4 address in the source address range
1398 * @param table_id VRF / table ID, 0 for the default FIB
1399 * @return 0 if all OK, else an error indication from api_errno.h
1403 tcp_configure_v4_source_address_range (vlib_main_t * vm,
1404 ip4_address_t * start,
1405 ip4_address_t * end, u32 table_id)
1407 tcp_main_t *tm = vnet_get_tcp_main ();
1408 vnet_main_t *vnm = vnet_get_main ();
1409 u32 start_host_byte_order, end_host_byte_order;
1410 fib_prefix_t prefix;
1411 vnet_sw_interface_t *si;
1412 fib_node_index_t fei;
1416 int vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1417 ip4_address_t * hi_addr, u32 fib_index,
1420 memset (&prefix, 0, sizeof (prefix));
1422 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
1424 if (fib_index == ~0)
1425 return VNET_API_ERROR_NO_SUCH_FIB;
1427 start_host_byte_order = clib_net_to_host_u32 (start->as_u32);
1428 end_host_byte_order = clib_net_to_host_u32 (end->as_u32);
1430 /* sanity check for reversed args or some such */
1431 if ((end_host_byte_order - start_host_byte_order) > (10 << 10))
1432 return VNET_API_ERROR_INVALID_ARGUMENT;
1434 /* Lookup the last address, to identify the interface involved */
1436 prefix.fp_proto = FIB_PROTOCOL_IP4;
1437 memcpy (&prefix.fp_addr.ip4, end, sizeof (ip4_address_t));
1439 fei = fib_table_lookup (fib_index, &prefix);
1441 /* Couldn't find route to destination. Bail out. */
1442 if (fei == FIB_NODE_INDEX_INVALID)
1443 return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB;
1445 sw_if_index = fib_entry_get_resolving_interface (fei);
1447 /* Enable proxy arp on the interface */
1448 si = vnet_get_sw_interface (vnm, sw_if_index);
1449 si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
1451 /* Configure proxy arp across the range */
1452 rv = vnet_proxy_arp_add_del (start, end, fib_index, 0 /* is_del */ );
1459 dpo_id_t dpo = DPO_INVALID;
1461 vec_add1 (tm->ip4_src_addresses, start[0]);
1463 /* Add local adjacencies for the range */
1465 receive_dpo_add_or_lock (DPO_PROTO_IP4, ~0 /* sw_if_index */ ,
1468 prefix.fp_proto = FIB_PROTOCOL_IP4;
1469 prefix.fp_addr.ip4.as_u32 = start->as_u32;
1471 fib_table_entry_special_dpo_update (fib_index,
1474 FIB_ENTRY_FLAG_EXCLUSIVE, &dpo);
1477 start_host_byte_order++;
1478 start->as_u32 = clib_host_to_net_u32 (start_host_byte_order);
1480 while (start_host_byte_order <= end_host_byte_order);
1486 * \brief Configure an ipv6 source address range
1487 * @param vm vlib_main_t pointer
1488 * @param start first ipv6 address in the source address range
1489 * @param end last ipv6 address in the source address range
1490 * @param table_id VRF / table ID, 0 for the default FIB
1491 * @return 0 if all OK, else an error indication from api_errno.h
1495 tcp_configure_v6_source_address_range (vlib_main_t * vm,
1496 ip6_address_t * start,
1497 ip6_address_t * end, u32 table_id)
1499 tcp_main_t *tm = vnet_get_tcp_main ();
1500 fib_prefix_t prefix;
1502 fib_node_index_t fei;
1505 memset (&prefix, 0, sizeof (prefix));
1507 fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
1509 if (fib_index == ~0)
1510 return VNET_API_ERROR_NO_SUCH_FIB;
1516 dpo_id_t dpo = DPO_INVALID;
1518 /* Remember this address */
1519 vec_add1 (tm->ip6_src_addresses, start[0]);
1521 /* Lookup the prefix, to identify the interface involved */
1522 prefix.fp_len = 128;
1523 prefix.fp_proto = FIB_PROTOCOL_IP6;
1524 memcpy (&prefix.fp_addr.ip6, start, sizeof (ip6_address_t));
1526 fei = fib_table_lookup (fib_index, &prefix);
1528 /* Couldn't find route to destination. Bail out. */
1529 if (fei == FIB_NODE_INDEX_INVALID)
1530 return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB;
1532 sw_if_index = fib_entry_get_resolving_interface (fei);
1534 if (sw_if_index == (u32) ~ 0)
1535 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
1537 /* Add a proxy neighbor discovery entry for this address */
1538 ip6_neighbor_proxy_add_del (sw_if_index, start, 0 /* is_del */ );
1540 /* Add a receive adjacency for this address */
1541 receive_dpo_add_or_lock (DPO_PROTO_IP6, ~0 /* sw_if_index */ ,
1544 fib_table_entry_special_dpo_update (fib_index,
1547 FIB_ENTRY_FLAG_EXCLUSIVE, &dpo);
1550 /* Done with the entire range? */
1551 if (!memcmp (start, end, sizeof (start[0])))
1554 /* Increment the address. DGMS. */
1556 for (i = 15; i >= 0; i--)
1559 if (tmp.as_u8[i] != 0)
1567 static clib_error_t *
1568 tcp_src_address (vlib_main_t * vm,
1569 unformat_input_t * input, vlib_cli_command_t * cmd_arg)
1571 ip4_address_t v4start, v4end;
1572 ip6_address_t v6start, v6end;
1578 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1580 if (unformat (input, "%U - %U", unformat_ip4_address, &v4start,
1581 unformat_ip4_address, &v4end))
1583 else if (unformat (input, "%U", unformat_ip4_address, &v4start))
1585 memcpy (&v4end, &v4start, sizeof (v4start));
1588 else if (unformat (input, "%U - %U", unformat_ip6_address, &v6start,
1589 unformat_ip6_address, &v6end))
1591 else if (unformat (input, "%U", unformat_ip6_address, &v6start))
1593 memcpy (&v6end, &v6start, sizeof (v4start));
1596 else if (unformat (input, "fib-table %d", &table_id))
1602 if (!v4set && !v6set)
1603 return clib_error_return (0, "at least one v4 or v6 address required");
1607 rv = tcp_configure_v4_source_address_range (vm, &v4start, &v4end,
1614 case VNET_API_ERROR_NO_SUCH_FIB:
1615 return clib_error_return (0, "Invalid table-id %d", table_id);
1617 case VNET_API_ERROR_INVALID_ARGUMENT:
1618 return clib_error_return (0, "Invalid address range %U - %U",
1619 format_ip4_address, &v4start,
1620 format_ip4_address, &v4end);
1622 return clib_error_return (0, "error %d", rv);
1628 rv = tcp_configure_v6_source_address_range (vm, &v6start, &v6end,
1635 case VNET_API_ERROR_NO_SUCH_FIB:
1636 return clib_error_return (0, "Invalid table-id %d", table_id);
1639 return clib_error_return (0, "error %d", rv);
1647 VLIB_CLI_COMMAND (tcp_src_address_command, static) =
1649 .path = "tcp src-address",
1650 .short_help = "tcp src-address <ip-addr> [- <ip-addr>] add src address range",
1651 .function = tcp_src_address,
1656 tcp_scoreboard_dump_trace (u8 * s, sack_scoreboard_t * sb)
1658 #if TCP_SCOREBOARD_TRACE
1660 scoreboard_trace_elt_t *block;
1666 s = format (s, "scoreboard trace:");
1667 vec_foreach (block, sb->trace)
1669 s = format (s, "{%u, %u, %u, %u, %u}, ", block->start, block->end,
1670 block->ack, block->snd_una_max, block->group);
1672 s = format (s, "\n");
1680 static clib_error_t *
1681 tcp_show_scoreboard_trace_fn (vlib_main_t * vm, unformat_input_t * input,
1682 vlib_cli_command_t * cmd_arg)
1684 transport_connection_t *tconn = 0;
1685 tcp_connection_t *tc;
1687 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1689 if (unformat (input, "%U", unformat_transport_connection, &tconn,
1690 TRANSPORT_PROTO_TCP))
1693 return clib_error_return (0, "unknown input `%U'",
1694 format_unformat_error, input);
1697 if (!TCP_SCOREBOARD_TRACE)
1699 vlib_cli_output (vm, "scoreboard tracing not enabled");
1703 tc = tcp_get_connection_from_transport (tconn);
1704 s = tcp_scoreboard_dump_trace (s, &tc->sack_sb);
1705 vlib_cli_output (vm, "%v", s);
1710 VLIB_CLI_COMMAND (tcp_show_scoreboard_trace_command, static) =
1712 .path = "show tcp scoreboard trace",
1713 .short_help = "show tcp scoreboard trace <connection>",
1714 .function = tcp_show_scoreboard_trace_fn,
1719 tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose)
1722 scoreboard_trace_elt_t *trace;
1723 u32 next_ack, left, group, has_new_ack = 0;
1724 tcp_connection_t _dummy_tc, *dummy_tc = &_dummy_tc;
1725 sack_block_t *block;
1730 memset (dummy_tc, 0, sizeof (*dummy_tc));
1731 tcp_connection_timers_init (dummy_tc);
1732 scoreboard_init (&dummy_tc->sack_sb);
1733 dummy_tc->rcv_opts.flags |= TCP_OPTS_FLAG_SACK;
1735 #if TCP_SCOREBOARD_TRACE
1736 trace = tc->sack_sb.trace;
1737 trace_len = vec_len (tc->sack_sb.trace);
1743 for (i = 0; i < trace_len; i++)
1745 if (trace[i].ack != 0)
1747 dummy_tc->snd_una = trace[i].ack - 1448;
1748 dummy_tc->snd_una_max = trace[i].ack;
1753 while (left < trace_len)
1755 group = trace[left].group;
1756 vec_reset_length (dummy_tc->rcv_opts.sacks);
1758 while (trace[left].group == group)
1760 if (trace[left].ack != 0)
1763 s = format (s, "Adding ack %u, snd_una_max %u, segs: ",
1764 trace[left].ack, trace[left].snd_una_max);
1765 dummy_tc->snd_una_max = trace[left].snd_una_max;
1766 next_ack = trace[left].ack;
1772 s = format (s, "[%u, %u], ", trace[left].start,
1774 vec_add2 (dummy_tc->rcv_opts.sacks, block, 1);
1775 block->start = trace[left].start;
1776 block->end = trace[left].end;
1782 tcp_rcv_sacks (dummy_tc, next_ack);
1784 dummy_tc->snd_una = next_ack + dummy_tc->sack_sb.snd_una_adv;
1787 s = format (s, "result: %U", format_tcp_scoreboard,
1788 &dummy_tc->sack_sb);
1791 s = format (s, "result: %U", format_tcp_scoreboard, &dummy_tc->sack_sb);
1796 static clib_error_t *
1797 tcp_scoreboard_trace_fn (vlib_main_t * vm, unformat_input_t * input,
1798 vlib_cli_command_t * cmd_arg)
1800 transport_connection_t *tconn = 0;
1801 tcp_connection_t *tc = 0;
1803 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1805 if (unformat (input, "%U", unformat_transport_connection, &tconn,
1806 TRANSPORT_PROTO_TCP))
1809 return clib_error_return (0, "unknown input `%U'",
1810 format_unformat_error, input);
1813 if (!TCP_SCOREBOARD_TRACE)
1815 vlib_cli_output (vm, "scoreboard tracing not enabled");
1819 tc = tcp_get_connection_from_transport (tconn);
1822 vlib_cli_output (vm, "connection not found");
1825 str = tcp_scoreboard_replay (str, tc, 1);
1826 vlib_cli_output (vm, "%v", str);
1831 VLIB_CLI_COMMAND (tcp_replay_scoreboard_command, static) =
1833 .path = "tcp replay scoreboard",
1834 .short_help = "tcp replay scoreboard <connection>",
1835 .function = tcp_scoreboard_trace_fn,
1840 * fd.io coding-style-patch-verification: ON
1843 * eval: (c-set-style "gnu")