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.
16 #include <vppinfra/sparse_vec.h>
17 #include <vnet/fib/ip4_fib.h>
18 #include <vnet/fib/ip6_fib.h>
19 #include <vnet/tcp/tcp.h>
20 #include <vnet/tcp/tcp_inlines.h>
21 #include <vnet/session/session.h>
24 static char *tcp_error_strings[] = {
25 #define tcp_error(n,s) s,
26 #include <vnet/tcp/tcp_error.def>
30 /* All TCP nodes have the same outgoing arcs */
31 #define foreach_tcp_state_next \
32 _ (DROP4, "ip4-drop") \
33 _ (DROP6, "ip6-drop") \
34 _ (TCP4_OUTPUT, "tcp4-output") \
35 _ (TCP6_OUTPUT, "tcp6-output")
37 typedef enum _tcp_established_next
39 #define _(s,n) TCP_ESTABLISHED_NEXT_##s,
40 foreach_tcp_state_next
42 TCP_ESTABLISHED_N_NEXT,
43 } tcp_established_next_t;
45 typedef enum _tcp_rcv_process_next
47 #define _(s,n) TCP_RCV_PROCESS_NEXT_##s,
48 foreach_tcp_state_next
50 TCP_RCV_PROCESS_N_NEXT,
51 } tcp_rcv_process_next_t;
53 typedef enum _tcp_syn_sent_next
55 #define _(s,n) TCP_SYN_SENT_NEXT_##s,
56 foreach_tcp_state_next
59 } tcp_syn_sent_next_t;
61 typedef enum _tcp_listen_next
63 #define _(s,n) TCP_LISTEN_NEXT_##s,
64 foreach_tcp_state_next
69 /* Generic, state independent indices */
70 typedef enum _tcp_state_next
72 #define _(s,n) TCP_NEXT_##s,
73 foreach_tcp_state_next
78 #define tcp_next_output(is_ip4) (is_ip4 ? TCP_NEXT_TCP4_OUTPUT \
79 : TCP_NEXT_TCP6_OUTPUT)
81 #define tcp_next_drop(is_ip4) (is_ip4 ? TCP_NEXT_DROP4 \
85 * Validate segment sequence number. As per RFC793:
87 * Segment Receive Test
89 * ------- ------- -------------------------------------------
90 * 0 0 SEG.SEQ = RCV.NXT
91 * 0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND
93 * >0 >0 RCV.NXT =< SEG.SEQ < RCV.NXT+RCV.WND
94 * or RCV.NXT =< SEG.SEQ+SEG.LEN-1 < RCV.NXT+RCV.WND
96 * This ultimately consists in checking if segment falls within the window.
97 * The one important difference compared to RFC793 is that we use rcv_las,
98 * or the rcv_nxt at last ack sent instead of rcv_nxt since that's the
99 * peer's reference when computing our receive window.
102 * seq_leq (end_seq, tc->rcv_las + tc->rcv_wnd) && seq_geq (seq, tc->rcv_las)
103 * however, is too strict when we have retransmits. Instead we just check that
104 * the seq is not beyond the right edge and that the end of the segment is not
105 * less than the left edge.
107 * N.B. rcv_nxt and rcv_wnd are both updated in this node if acks are sent, so
108 * use rcv_nxt in the right edge window test instead of rcv_las.
112 tcp_segment_in_rcv_wnd (tcp_connection_t * tc, u32 seq, u32 end_seq)
114 return (seq_geq (end_seq, tc->rcv_las)
115 && seq_leq (seq, tc->rcv_nxt + tc->rcv_wnd));
119 * RFC1323: Check against wrapped sequence numbers (PAWS). If we have
120 * timestamp to echo and it's less than tsval_recent, drop segment
121 * but still send an ACK in order to retain TCP's mechanism for detecting
122 * and recovering from half-open connections
124 * Or at least that's what the theory says. It seems that this might not work
125 * very well with packet reordering and fast retransmit. XXX
128 tcp_segment_check_paws (tcp_connection_t * tc)
130 return tcp_opts_tstamp (&tc->rcv_opts)
131 && timestamp_lt (tc->rcv_opts.tsval, tc->tsval_recent);
135 * Update tsval recent
138 tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end)
141 * RFC1323: If Last.ACK.sent falls within the range of sequence numbers
142 * of an incoming segment:
143 * SEG.SEQ <= Last.ACK.sent < SEG.SEQ + SEG.LEN
144 * then the TSval from the segment is copied to TS.Recent;
145 * otherwise, the TSval is ignored.
147 if (tcp_opts_tstamp (&tc->rcv_opts) && seq_leq (seq, tc->rcv_las)
148 && seq_leq (tc->rcv_las, seq_end))
150 ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval));
151 tc->tsval_recent = tc->rcv_opts.tsval;
152 tc->tsval_recent_age = tcp_time_now_w_thread (tc->c_thread_index);
157 tcp_handle_rst (tcp_connection_t * tc)
159 switch (tc->rst_state)
161 case TCP_STATE_SYN_RCVD:
162 /* Cleanup everything. App wasn't notified yet */
163 session_transport_delete_notify (&tc->connection);
164 tcp_connection_cleanup (tc);
166 case TCP_STATE_SYN_SENT:
167 session_stream_connect_notify (&tc->connection, 1 /* fail */ );
168 tcp_connection_cleanup (tc);
170 case TCP_STATE_ESTABLISHED:
171 session_transport_reset_notify (&tc->connection);
172 session_transport_closed_notify (&tc->connection);
174 case TCP_STATE_CLOSE_WAIT:
175 case TCP_STATE_FIN_WAIT_1:
176 case TCP_STATE_FIN_WAIT_2:
177 case TCP_STATE_CLOSING:
178 case TCP_STATE_LAST_ACK:
179 session_transport_closed_notify (&tc->connection);
181 case TCP_STATE_CLOSED:
182 case TCP_STATE_TIME_WAIT:
185 TCP_DBG ("reset state: %u", tc->state);
190 tcp_program_reset_ntf (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
192 if (!tcp_disconnect_pending (tc))
194 tc->rst_state = tc->state;
195 vec_add1 (wrk->pending_resets, tc->c_c_index);
196 tcp_disconnect_pending_on (tc);
201 * Handle reset packet
203 * Programs disconnect/reset notification that should be sent
204 * later by calling @ref tcp_handle_disconnects
207 tcp_rcv_rst (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
209 TCP_EVT (TCP_EVT_RST_RCVD, tc);
212 case TCP_STATE_SYN_RCVD:
213 tcp_program_reset_ntf (wrk, tc);
214 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
216 case TCP_STATE_SYN_SENT:
217 /* Do not program ntf because the connection is half-open */
220 case TCP_STATE_ESTABLISHED:
221 tcp_connection_timers_reset (tc);
222 tcp_cong_recovery_off (tc);
223 tcp_program_reset_ntf (wrk, tc);
224 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
225 tcp_program_cleanup (wrk, tc);
227 case TCP_STATE_CLOSE_WAIT:
228 case TCP_STATE_FIN_WAIT_1:
229 case TCP_STATE_FIN_WAIT_2:
230 case TCP_STATE_CLOSING:
231 case TCP_STATE_LAST_ACK:
232 tcp_connection_timers_reset (tc);
233 tcp_cong_recovery_off (tc);
234 tcp_program_reset_ntf (wrk, tc);
235 /* Make sure we mark the session as closed. In some states we may
236 * be still trying to send data */
237 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
238 tcp_program_cleanup (wrk, tc);
240 case TCP_STATE_CLOSED:
241 case TCP_STATE_TIME_WAIT:
244 TCP_DBG ("reset state: %u", tc->state);
249 * Validate incoming segment as per RFC793 p. 69 and RFC1323 p. 19
251 * It first verifies if segment has a wrapped sequence number (PAWS) and then
252 * does the processing associated to the first four steps (ignoring security
253 * and precedence): sequence number, rst bit and syn bit checks.
255 * @return 0 if segments passes validation.
258 tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0,
259 vlib_buffer_t * b0, tcp_header_t * th0, u32 * error0)
261 /* We could get a burst of RSTs interleaved with acks */
262 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
264 tcp_send_reset (tc0);
265 *error0 = TCP_ERROR_CONNECTION_CLOSED;
269 if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0)))
271 *error0 = TCP_ERROR_SEGMENT_INVALID;
275 if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts, 0)))
277 *error0 = TCP_ERROR_OPTIONS;
281 if (PREDICT_FALSE (tcp_segment_check_paws (tc0)))
283 *error0 = TCP_ERROR_PAWS;
284 TCP_EVT (TCP_EVT_PAWS_FAIL, tc0, vnet_buffer (b0)->tcp.seq_number,
285 vnet_buffer (b0)->tcp.seq_end);
287 /* If it just so happens that a segment updates tsval_recent for a
288 * segment over 24 days old, invalidate tsval_recent. */
289 if (timestamp_lt (tc0->tsval_recent_age + TCP_PAWS_IDLE,
290 tcp_time_now_w_thread (tc0->c_thread_index)))
292 tc0->tsval_recent = tc0->rcv_opts.tsval;
293 clib_warning ("paws failed: 24-day old segment");
295 /* Drop after ack if not rst. Resets can fail paws check as per
296 * RFC 7323 sec. 5.2: When an <RST> segment is received, it MUST NOT
297 * be subjected to the PAWS check by verifying an acceptable value in
299 else if (!tcp_rst (th0))
301 tcp_program_ack (tc0);
302 TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
307 /* 1st: check sequence number */
308 if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number,
309 vnet_buffer (b0)->tcp.seq_end))
311 /* SYN/SYN-ACK retransmit */
313 && vnet_buffer (b0)->tcp.seq_number == tc0->rcv_nxt - 1)
315 tcp_options_parse (th0, &tc0->rcv_opts, 1);
316 if (tc0->state == TCP_STATE_SYN_RCVD)
318 tcp_send_synack (tc0);
319 TCP_EVT (TCP_EVT_SYN_RCVD, tc0, 0);
320 *error0 = TCP_ERROR_SYNS_RCVD;
324 tcp_program_ack (tc0);
325 TCP_EVT (TCP_EVT_SYNACK_RCVD, tc0);
326 *error0 = TCP_ERROR_SYN_ACKS_RCVD;
331 /* If our window is 0 and the packet is in sequence, let it pass
332 * through for ack processing. It should be dropped later. */
333 if (tc0->rcv_wnd < tc0->snd_mss
334 && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number)
337 /* If we entered recovery and peer did so as well, there's a chance that
338 * dup acks won't be acceptable on either end because seq_end may be less
339 * than rcv_las. This can happen if acks are lost in both directions. */
340 if (tcp_in_recovery (tc0)
341 && seq_geq (vnet_buffer (b0)->tcp.seq_number,
342 tc0->rcv_las - tc0->rcv_wnd)
343 && seq_leq (vnet_buffer (b0)->tcp.seq_end,
344 tc0->rcv_nxt + tc0->rcv_wnd))
347 *error0 = TCP_ERROR_RCV_WND;
349 /* If we advertised a zero rcv_wnd and the segment is in the past or the
350 * next one that we expect, it is probably a window probe */
351 if ((tc0->flags & TCP_CONN_ZERO_RWND_SENT)
352 && seq_lt (vnet_buffer (b0)->tcp.seq_end,
353 tc0->rcv_las + tc0->rcv_opts.mss))
354 *error0 = TCP_ERROR_ZERO_RWND;
356 tc0->errors.below_data_wnd += seq_lt (vnet_buffer (b0)->tcp.seq_end,
359 /* If not RST, send dup ack */
362 tcp_program_dupack (tc0);
363 TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
371 /* 2nd: check the RST bit */
372 if (PREDICT_FALSE (tcp_rst (th0)))
374 tcp_rcv_rst (wrk, tc0);
375 *error0 = TCP_ERROR_RST_RCVD;
379 /* 3rd: check security and precedence (skip) */
381 /* 4th: check the SYN bit (in window) */
382 if (PREDICT_FALSE (tcp_syn (th0)))
384 /* As per RFC5961 send challenge ack instead of reset */
385 tcp_program_ack (tc0);
386 *error0 = TCP_ERROR_SPURIOUS_SYN;
390 /* If segment in window, save timestamp */
391 tcp_update_timestamp (tc0, vnet_buffer (b0)->tcp.seq_number,
392 vnet_buffer (b0)->tcp.seq_end);
400 tcp_rcv_ack_no_cc (tcp_connection_t * tc, vlib_buffer_t * b, u32 * error)
402 /* SND.UNA =< SEG.ACK =< SND.NXT */
403 if (!(seq_leq (tc->snd_una, vnet_buffer (b)->tcp.ack_number)
404 && seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
406 if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max)
407 && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
409 tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
412 *error = TCP_ERROR_ACK_INVALID;
417 tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una;
418 tc->snd_una = vnet_buffer (b)->tcp.ack_number;
419 *error = TCP_ERROR_ACK_OK;
424 * Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298
426 * Note that although the original article, srtt and rttvar are scaled
427 * to minimize round-off errors, here we don't. Instead, we rely on
428 * better precision time measurements.
431 tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt)
437 err = mrtt - tc->srtt;
439 /* XXX Drop in RTT results in RTTVAR increase and bigger RTO.
440 * The increase should be bound */
441 tc->srtt = clib_max ((int) tc->srtt + (err >> 3), 1);
442 diff = (clib_abs (err) - (int) tc->rttvar) >> 2;
443 tc->rttvar = clib_max ((int) tc->rttvar + diff, 1);
447 /* First measurement. */
449 tc->rttvar = mrtt >> 1;
454 tcp_estimate_rtt_us (tcp_connection_t * tc, f64 mrtt)
456 tc->mrtt_us = tc->mrtt_us + (mrtt - tc->mrtt_us) * 0.125;
460 * Update rtt estimate
462 * We have potentially three sources of rtt measurements:
464 * TSOPT difference between current and echoed timestamp. It has ms
465 * precision and can be computed per ack
466 * ACK timing one sequence number is tracked per rtt with us (micro second)
468 * rate sample if enabled, all outstanding bytes are tracked with us
469 * precision. Every ack and sack are a rtt sample
471 * Middle boxes are known to fiddle with TCP options so we give higher
472 * priority to ACK timing.
474 * For now, rate sample rtts are only used under congestion.
477 tcp_update_rtt (tcp_connection_t * tc, tcp_rate_sample_t * rs, u32 ack)
481 /* Karn's rule, part 1. Don't use retransmitted segments to estimate
482 * RTT because they're ambiguous. */
483 if (tcp_in_cong_recovery (tc))
485 /* Accept rtt estimates for samples that have not been retransmitted */
486 if (!(tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
487 || (rs->flags & TCP_BTS_IS_RXT))
490 tcp_estimate_rtt_us (tc, rs->rtt_time);
491 mrtt = rs->rtt_time * THZ;
495 if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq))
497 f64 sample = tcp_time_now_us (tc->c_thread_index) - tc->rtt_ts;
498 tcp_estimate_rtt_us (tc, sample);
499 mrtt = clib_max ((u32) (sample * THZ), 1);
500 /* Allow measuring of a new RTT */
503 /* As per RFC7323 TSecr can be used for RTTM only if the segment advances
504 * snd_una, i.e., the left side of the send window:
505 * seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */
506 else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr)
508 u32 now = tcp_tstamp (tc);
509 mrtt = clib_max (now - tc->rcv_opts.tsecr, 1);
514 /* Ignore dubious measurements */
515 if (mrtt == 0 || mrtt > TCP_RTT_MAX)
518 tcp_estimate_rtt (tc, mrtt);
522 /* If we got here something must've been ACKed so make sure boff is 0,
523 * even if mrtt is not valid since we update the rto lower */
531 tcp_estimate_initial_rtt (tcp_connection_t * tc)
533 u8 thread_index = vlib_num_workers ()? 1 : 0;
538 tc->mrtt_us = tcp_time_now_us (thread_index) - tc->rtt_ts;
539 tc->mrtt_us = clib_max (tc->mrtt_us, 0.0001);
540 mrtt = clib_max ((u32) (tc->mrtt_us * THZ), 1);
545 mrtt = tcp_time_now_w_thread (thread_index) - tc->rcv_opts.tsecr;
546 mrtt = clib_max (mrtt, 1);
547 /* Due to retransmits we don't know the initial mrtt */
548 if (tc->rto_boff && mrtt > 1 * THZ)
550 tc->mrtt_us = (f64) mrtt *TCP_TICK;
553 if (mrtt > 0 && mrtt < TCP_RTT_MAX)
554 tcp_estimate_rtt (tc, mrtt);
559 * Dequeue bytes for connections that have received acks in last burst
562 tcp_handle_postponed_dequeues (tcp_worker_ctx_t * wrk)
564 u32 thread_index = wrk->vm->thread_index;
565 u32 *pending_deq_acked;
566 tcp_connection_t *tc;
569 if (!vec_len (wrk->pending_deq_acked))
572 pending_deq_acked = wrk->pending_deq_acked;
573 for (i = 0; i < vec_len (pending_deq_acked); i++)
575 tc = tcp_connection_get (pending_deq_acked[i], thread_index);
576 tc->flags &= ~TCP_CONN_DEQ_PENDING;
578 if (PREDICT_FALSE (!tc->burst_acked))
581 /* Dequeue the newly ACKed bytes */
582 session_tx_fifo_dequeue_drop (&tc->connection, tc->burst_acked);
583 tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
585 if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING))
587 if (seq_leq (tc->psh_seq, tc->snd_una))
588 tc->flags &= ~TCP_CONN_PSH_PENDING;
591 if (tcp_is_descheduled (tc))
594 /* If everything has been acked, stop retransmit timer
595 * otherwise update. */
596 tcp_retransmit_timer_update (&wrk->timer_wheel, tc);
598 /* Update pacer based on our new cwnd estimate */
599 tcp_connection_tx_pacer_update (tc);
603 _vec_len (wrk->pending_deq_acked) = 0;
607 tcp_program_dequeue (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
609 if (!(tc->flags & TCP_CONN_DEQ_PENDING))
611 vec_add1 (wrk->pending_deq_acked, tc->c_c_index);
612 tc->flags |= TCP_CONN_DEQ_PENDING;
614 tc->burst_acked += tc->bytes_acked;
618 * Try to update snd_wnd based on feedback received from peer.
620 * If successful, and new window is 'effectively' 0, activate persist
624 tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd)
626 /* If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set
627 * SND.WND <- SEG.WND, set SND.WL1 <- SEG.SEQ, and set SND.WL2 <- SEG.ACK */
628 if (seq_lt (tc->snd_wl1, seq)
629 || (tc->snd_wl1 == seq && seq_leq (tc->snd_wl2, ack)))
631 tc->snd_wnd = snd_wnd;
634 TCP_EVT (TCP_EVT_SND_WND, tc);
636 if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
638 /* Set persist timer if not set and we just got 0 wnd */
639 if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST)
640 && !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))
642 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
643 tcp_persist_timer_set (&wrk->timer_wheel, tc);
648 if (PREDICT_FALSE (tcp_timer_is_active (tc, TCP_TIMER_PERSIST)))
650 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
651 tcp_persist_timer_reset (&wrk->timer_wheel, tc);
654 if (PREDICT_FALSE (tcp_is_descheduled (tc)))
657 if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0))
667 * Init loss recovery/fast recovery.
669 * Triggered by dup acks as opposed to timer timeout. Note that cwnd is
670 * updated in @ref tcp_cc_handle_event after fast retransmit
673 tcp_cc_init_congestion (tcp_connection_t * tc)
675 tcp_fastrecovery_on (tc);
676 tc->snd_congestion = tc->snd_nxt;
677 tc->cwnd_acc_bytes = 0;
678 tc->snd_rxt_bytes = 0;
679 tc->rxt_delivered = 0;
680 tc->prr_delivered = 0;
681 tc->prr_start = tc->snd_una;
682 tc->prev_ssthresh = tc->ssthresh;
683 tc->prev_cwnd = tc->cwnd;
685 tc->snd_rxt_ts = tcp_tstamp (tc);
686 tcp_cc_congestion (tc);
688 /* Post retransmit update cwnd to ssthresh and account for the
689 * three segments that have left the network and should've been
690 * buffered at the receiver XXX */
691 if (!tcp_opts_sack_permitted (&tc->rcv_opts))
692 tc->cwnd += 3 * tc->snd_mss;
694 tc->fr_occurences += 1;
695 TCP_EVT (TCP_EVT_CC_EVT, tc, 4);
699 tcp_cc_congestion_undo (tcp_connection_t * tc)
701 tc->cwnd = tc->prev_cwnd;
702 tc->ssthresh = tc->prev_ssthresh;
703 tcp_cc_undo_recovery (tc);
704 ASSERT (tc->rto_boff == 0);
705 TCP_EVT (TCP_EVT_CC_EVT, tc, 5);
709 tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc)
711 return (tcp_in_recovery (tc) && tc->rto_boff == 1
713 && tcp_opts_tstamp (&tc->rcv_opts)
714 && timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts));
718 tcp_cc_is_spurious_retransmit (tcp_connection_t * tc)
720 return (tcp_cc_is_spurious_timeout_rxt (tc));
724 tcp_should_fastrecover_sack (tcp_connection_t * tc)
726 return (tc->sack_sb.lost_bytes
727 || ((TCP_DUPACK_THRESHOLD - 1) * tc->snd_mss
728 < tc->sack_sb.sacked_bytes));
732 tcp_should_fastrecover (tcp_connection_t * tc, u8 has_sack)
736 /* If of of the two conditions lower hold, reset dupacks because
737 * we're probably after timeout (RFC6582 heuristics).
738 * If Cumulative ack does not cover more than congestion threshold,
740 * 1) The following doesn't hold: The congestion window is greater
741 * than SMSS bytes and the difference between highest_ack
742 * and prev_highest_ack is at most 4*SMSS bytes
743 * 2) Echoed timestamp in the last non-dup ack does not equal the
746 if (seq_leq (tc->snd_una, tc->snd_congestion)
747 && ((!(tc->cwnd > tc->snd_mss
748 && tc->bytes_acked <= 4 * tc->snd_mss))
749 || (tc->rcv_opts.tsecr != tc->tsecr_last_ack)))
755 return ((tc->rcv_dupacks == TCP_DUPACK_THRESHOLD)
756 || tcp_should_fastrecover_sack (tc));
760 tcp_cc_recover (tcp_connection_t * tc)
762 sack_scoreboard_hole_t *hole;
765 ASSERT (tcp_in_cong_recovery (tc));
767 if (tcp_cc_is_spurious_retransmit (tc))
769 tcp_cc_congestion_undo (tc);
773 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ );
776 /* Previous recovery left us congested. Continue sending as part
777 * of the current recovery event with an updated snd_congestion */
778 if (tc->sack_sb.sacked_bytes)
780 tc->snd_congestion = tc->snd_nxt;
781 tcp_program_retransmit (tc);
785 tc->rxt_delivered = 0;
786 tc->snd_rxt_bytes = 0;
788 tc->prr_delivered = 0;
790 tc->flags &= ~TCP_CONN_RXT_PENDING;
792 hole = scoreboard_first_hole (&tc->sack_sb);
793 if (hole && hole->start == tc->snd_una && hole->end == tc->snd_nxt)
794 scoreboard_clear (&tc->sack_sb);
796 if (!tcp_in_recovery (tc) && !is_spurious)
797 tcp_cc_recovered (tc);
799 tcp_fastrecovery_off (tc);
800 tcp_fastrecovery_first_off (tc);
801 tcp_recovery_off (tc);
802 TCP_EVT (TCP_EVT_CC_EVT, tc, 3);
804 ASSERT (tc->rto_boff == 0);
805 ASSERT (!tcp_in_cong_recovery (tc));
806 ASSERT (tcp_scoreboard_is_sane_post_recovery (tc));
812 tcp_cc_update (tcp_connection_t * tc, tcp_rate_sample_t * rs)
814 ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc));
816 /* Congestion avoidance */
817 tcp_cc_rcv_ack (tc, rs);
819 /* If a cumulative ack, make sure dupacks is 0 */
822 /* When dupacks hits the threshold we only enter fast retransmit if
823 * cumulative ack covers more than snd_congestion. Should snd_una
824 * wrap this test may fail under otherwise valid circumstances.
825 * Therefore, proactively update snd_congestion when wrap detected. */
827 (seq_leq (tc->snd_congestion, tc->snd_una - tc->bytes_acked)
828 && seq_gt (tc->snd_congestion, tc->snd_una)))
829 tc->snd_congestion = tc->snd_una - 1;
833 * One function to rule them all ... and in the darkness bind them
836 tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs,
839 u8 has_sack = tcp_opts_sack_permitted (&tc->rcv_opts);
841 /* If reneging, wait for timer based retransmits */
842 if (PREDICT_FALSE (tcp_is_lost_fin (tc) || tc->sack_sb.is_reneging))
846 * If not in recovery, figure out if we should enter
848 if (!tcp_in_cong_recovery (tc))
853 TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1);
854 tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs);
856 if (tcp_should_fastrecover (tc, has_sack))
858 tcp_cc_init_congestion (tc);
861 scoreboard_init_rxt (&tc->sack_sb, tc->snd_una);
863 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ );
864 tcp_program_retransmit (tc);
871 * Already in recovery
875 * Process (re)transmit feedback. Output path uses this to decide how much
876 * more data to release into the network
880 if (!tc->bytes_acked && tc->sack_sb.rxt_sacked)
881 tcp_fastrecovery_first_on (tc);
883 tc->rxt_delivered += tc->sack_sb.rxt_sacked;
884 tc->prr_delivered += tc->bytes_acked + tc->sack_sb.last_sacked_bytes
885 - tc->sack_sb.last_bytes_delivered;
891 tc->rcv_dupacks += 1;
892 TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1);
894 tc->rxt_delivered = clib_min (tc->rxt_delivered + tc->bytes_acked,
897 tc->prr_delivered += clib_min (tc->snd_mss,
898 tc->snd_nxt - tc->snd_una);
900 tc->prr_delivered += tc->bytes_acked - clib_min (tc->bytes_acked,
904 /* If partial ack, assume that the first un-acked segment was lost */
905 if (tc->bytes_acked || tc->rcv_dupacks == TCP_DUPACK_THRESHOLD)
906 tcp_fastrecovery_first_on (tc);
910 * See if we can exit and stop retransmitting
912 if (seq_geq (tc->snd_una, tc->snd_congestion))
914 /* If spurious return, we've already updated everything */
915 if (tcp_cc_recover (tc))
917 tc->tsecr_last_ack = tc->rcv_opts.tsecr;
921 /* Treat as congestion avoidance ack */
922 tcp_cc_rcv_ack (tc, rs);
926 tcp_program_retransmit (tc);
929 * Notify cc of the event
932 if (!tc->bytes_acked)
934 tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs);
938 /* RFC6675: If the incoming ACK is a cumulative acknowledgment,
939 * reset dupacks to 0. Also needed if in congestion recovery */
942 if (tcp_in_recovery (tc))
943 tcp_cc_rcv_ack (tc, rs);
945 tcp_cc_rcv_cong_ack (tc, TCP_CC_PARTIALACK, rs);
949 tcp_handle_old_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs)
951 if (!tcp_in_cong_recovery (tc))
954 if (tcp_opts_sack_permitted (&tc->rcv_opts))
955 tcp_rcv_sacks (tc, tc->snd_una);
959 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
960 tcp_bt_sample_delivery_rate (tc, rs);
962 tcp_cc_handle_event (tc, rs, 1);
966 * Check if duplicate ack as per RFC5681 Sec. 2
969 tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd,
972 return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una)
973 && seq_gt (tc->snd_nxt, tc->snd_una)
974 && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number)
975 && (prev_snd_wnd == tc->snd_wnd));
979 * Checks if ack is a congestion control event.
982 tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b,
983 u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack)
985 /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are
986 * defined to be 'duplicate' as well */
987 *is_dack = tc->sack_sb.last_sacked_bytes
988 || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una);
990 return (*is_dack || tcp_in_cong_recovery (tc));
994 * Process incoming ACK
997 tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
998 tcp_header_t * th, u32 * error)
1000 u32 prev_snd_wnd, prev_snd_una;
1001 tcp_rate_sample_t rs = { 0 };
1004 TCP_EVT (TCP_EVT_CC_STAT, tc);
1006 /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */
1007 if (PREDICT_FALSE (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
1009 /* We've probably entered recovery and the peer still has some
1010 * of the data we've sent. Update snd_nxt and accept the ack */
1011 if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_una_max)
1012 && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
1014 tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
1018 tc->errors.above_ack_wnd += 1;
1019 *error = TCP_ERROR_ACK_FUTURE;
1020 TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 0, vnet_buffer (b)->tcp.ack_number);
1024 /* If old ACK, probably it's an old dupack */
1025 if (PREDICT_FALSE (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una)))
1027 tc->errors.below_ack_wnd += 1;
1028 *error = TCP_ERROR_ACK_OLD;
1029 TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 1, vnet_buffer (b)->tcp.ack_number);
1031 if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una - tc->rcv_wnd))
1034 tcp_handle_old_ack (tc, &rs);
1036 /* Don't drop yet */
1043 * Looks okay, process feedback
1046 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1047 tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number);
1049 prev_snd_wnd = tc->snd_wnd;
1050 prev_snd_una = tc->snd_una;
1051 tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number,
1052 vnet_buffer (b)->tcp.ack_number,
1053 clib_net_to_host_u16 (th->window) << tc->snd_wscale);
1054 tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una;
1055 tc->snd_una = vnet_buffer (b)->tcp.ack_number;
1056 tcp_validate_txf_size (tc, tc->bytes_acked);
1058 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
1059 tcp_bt_sample_delivery_rate (tc, &rs);
1061 if (tc->bytes_acked + tc->sack_sb.last_sacked_bytes)
1063 tcp_update_rtt (tc, &rs, vnet_buffer (b)->tcp.ack_number);
1064 if (tc->bytes_acked)
1065 tcp_program_dequeue (wrk, tc);
1068 TCP_EVT (TCP_EVT_ACK_RCVD, tc);
1071 * Check if we have congestion event
1074 if (tcp_ack_is_cc_event (tc, b, prev_snd_wnd, prev_snd_una, &is_dack))
1076 tcp_cc_handle_event (tc, &rs, is_dack);
1077 tc->dupacks_in += is_dack;
1078 if (!tcp_in_cong_recovery (tc))
1080 *error = TCP_ERROR_ACK_OK;
1083 *error = TCP_ERROR_ACK_DUP;
1084 if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th))
1090 * Update congestion control (slow start/congestion avoidance)
1092 tcp_cc_update (tc, &rs);
1093 *error = TCP_ERROR_ACK_OK;
1098 tcp_program_disconnect (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1100 if (!tcp_disconnect_pending (tc))
1102 vec_add1 (wrk->pending_disconnects, tc->c_c_index);
1103 tcp_disconnect_pending_on (tc);
1108 tcp_handle_disconnects (tcp_worker_ctx_t * wrk)
1110 u32 thread_index, *pending_disconnects, *pending_resets;
1111 tcp_connection_t *tc;
1114 if (vec_len (wrk->pending_disconnects))
1116 thread_index = wrk->vm->thread_index;
1117 pending_disconnects = wrk->pending_disconnects;
1118 for (i = 0; i < vec_len (pending_disconnects); i++)
1120 tc = tcp_connection_get (pending_disconnects[i], thread_index);
1121 tcp_disconnect_pending_off (tc);
1122 session_transport_closing_notify (&tc->connection);
1124 _vec_len (wrk->pending_disconnects) = 0;
1127 if (vec_len (wrk->pending_resets))
1129 thread_index = wrk->vm->thread_index;
1130 pending_resets = wrk->pending_resets;
1131 for (i = 0; i < vec_len (pending_resets); i++)
1133 tc = tcp_connection_get (pending_resets[i], thread_index);
1134 tcp_disconnect_pending_off (tc);
1135 tcp_handle_rst (tc);
1137 _vec_len (wrk->pending_resets) = 0;
1142 tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
1145 /* Reject out-of-order fins */
1146 if (vnet_buffer (b)->tcp.seq_end != tc->rcv_nxt)
1149 /* Account for the FIN and send ack */
1151 tc->flags |= TCP_CONN_FINRCVD;
1152 tcp_program_ack (tc);
1153 /* Enter CLOSE-WAIT and notify session. To avoid lingering
1154 * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
1155 tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT);
1156 tcp_program_disconnect (wrk, tc);
1157 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
1158 tcp_cfg.closewait_time);
1159 TCP_EVT (TCP_EVT_FIN_RCVD, tc);
1160 *error = TCP_ERROR_FIN_RCVD;
1163 /** Enqueue data for delivery to application */
1165 tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b,
1168 int written, error = TCP_ERROR_ENQUEUED;
1170 ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
1172 written = session_enqueue_stream_connection (&tc->connection, b, 0,
1173 1 /* queue event */ , 1);
1174 tc->bytes_in += written;
1176 TCP_EVT (TCP_EVT_INPUT, tc, 0, data_len, written);
1178 /* Update rcv_nxt */
1179 if (PREDICT_TRUE (written == data_len))
1181 tc->rcv_nxt += written;
1183 /* If more data written than expected, account for out-of-order bytes. */
1184 else if (written > data_len)
1186 tc->rcv_nxt += written;
1187 TCP_EVT (TCP_EVT_CC_INPUT, tc, data_len, written);
1189 else if (written > 0)
1191 /* We've written something but FIFO is probably full now */
1192 tc->rcv_nxt += written;
1193 error = TCP_ERROR_PARTIALLY_ENQUEUED;
1197 /* Packet made it through for ack processing */
1198 if (tc->rcv_wnd < tc->snd_mss)
1199 return TCP_ERROR_ZERO_RWND;
1201 return TCP_ERROR_FIFO_FULL;
1204 /* Update SACK list if need be */
1205 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1207 /* Remove SACK blocks that have been delivered */
1208 tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt);
1214 /** Enqueue out-of-order data */
1216 tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b,
1222 ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
1225 /* Enqueue out-of-order data with relative offset */
1226 rv = session_enqueue_stream_connection (&tc->connection, b,
1227 vnet_buffer (b)->tcp.seq_number -
1228 tc->rcv_nxt, 0 /* queue event */ ,
1231 /* Nothing written */
1234 TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, 0);
1235 return TCP_ERROR_FIFO_FULL;
1238 TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, data_len);
1239 tc->bytes_in += data_len;
1241 /* Update SACK list if in use */
1242 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1244 ooo_segment_t *newest;
1247 s0 = session_get (tc->c_s_index, tc->c_thread_index);
1249 /* Get the newest segment from the fifo */
1250 newest = svm_fifo_newest_ooo_segment (s0->rx_fifo);
1253 offset = ooo_segment_offset_prod (s0->rx_fifo, newest);
1254 ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt);
1255 start = tc->rcv_nxt + offset;
1256 end = start + ooo_segment_length (s0->rx_fifo, newest);
1257 tcp_update_sack_list (tc, start, end);
1258 svm_fifo_newest_ooo_segment_reset (s0->rx_fifo);
1259 TCP_EVT (TCP_EVT_CC_SACKS, tc);
1263 return TCP_ERROR_ENQUEUED_OOO;
1267 * Check if ACK could be delayed. If ack can be delayed, it should return
1268 * true for a full frame. If we're always acking return 0.
1271 tcp_can_delack (tcp_connection_t * tc)
1273 /* Send ack if ... */
1275 /* just sent a rcv wnd 0
1276 || (tc->flags & TCP_CONN_SENT_RCV_WND0) != 0 */
1277 /* constrained to send ack */
1278 || (tc->flags & TCP_CONN_SNDACK) != 0
1279 /* we're almost out of tx wnd */
1280 || tcp_available_cc_snd_space (tc) < 4 * tc->snd_mss)
1287 tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop)
1289 u32 discard, first = b->current_length;
1290 vlib_main_t *vm = vlib_get_main ();
1292 /* Handle multi-buffer segments */
1293 if (n_bytes_to_drop > b->current_length)
1295 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
1299 discard = clib_min (n_bytes_to_drop, b->current_length);
1300 vlib_buffer_advance (b, discard);
1301 b = vlib_get_buffer (vm, b->next_buffer);
1302 n_bytes_to_drop -= discard;
1304 while (n_bytes_to_drop);
1305 if (n_bytes_to_drop > first)
1306 b->total_length_not_including_first_buffer -= n_bytes_to_drop - first;
1309 vlib_buffer_advance (b, n_bytes_to_drop);
1310 vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop;
1315 * Receive buffer for connection and handle acks
1317 * It handles both in order or out-of-order data.
1320 tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1323 u32 error, n_bytes_to_drop, n_data_bytes;
1325 vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset);
1326 n_data_bytes = vnet_buffer (b)->tcp.data_len;
1327 ASSERT (n_data_bytes);
1328 tc->data_segs_in += 1;
1330 /* Handle out-of-order data */
1331 if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt))
1333 /* Old sequence numbers allowed through because they overlapped
1335 if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt))
1337 /* Completely in the past (possible retransmit). Ack
1338 * retransmissions since we may not have any data to send */
1339 if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt))
1341 tcp_program_dupack (tc);
1342 tc->errors.below_data_wnd++;
1343 error = TCP_ERROR_SEGMENT_OLD;
1347 /* Chop off the bytes in the past and see if what is left
1348 * can be enqueued in order */
1349 n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number;
1350 n_data_bytes -= n_bytes_to_drop;
1351 vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt;
1352 if (tcp_buffer_discard_bytes (b, n_bytes_to_drop))
1354 error = TCP_ERROR_SEGMENT_OLD;
1360 /* RFC2581: Enqueue and send DUPACK for fast retransmit */
1361 error = tcp_session_enqueue_ooo (tc, b, n_data_bytes);
1362 tcp_program_dupack (tc);
1363 TCP_EVT (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp);
1364 tc->errors.above_data_wnd += seq_gt (vnet_buffer (b)->tcp.seq_end,
1365 tc->rcv_las + tc->rcv_wnd);
1371 /* In order data, enqueue. Fifo figures out by itself if any out-of-order
1372 * segments can be enqueued after fifo tail offset changes. */
1373 error = tcp_session_enqueue_data (tc, b, n_data_bytes);
1374 if (tcp_can_delack (tc))
1376 if (!tcp_timer_is_active (tc, TCP_TIMER_DELACK))
1377 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_DELACK,
1378 tcp_cfg.delack_time);
1382 tcp_program_ack (tc);
1390 tcp_header_t tcp_header;
1391 tcp_connection_t tcp_connection;
1395 format_tcp_rx_trace (u8 * s, va_list * args)
1397 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1398 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1399 tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
1400 tcp_connection_t *tc = &t->tcp_connection;
1401 u32 indent = format_get_indent (s);
1403 s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc,
1404 format_tcp_state, tc->state, format_white_space, indent,
1405 format_tcp_header, &t->tcp_header, 128);
1411 format_tcp_rx_trace_short (u8 * s, va_list * args)
1413 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1414 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1415 tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
1417 s = format (s, "%d -> %d (%U)",
1418 clib_net_to_host_u16 (t->tcp_header.dst_port),
1419 clib_net_to_host_u16 (t->tcp_header.src_port), format_tcp_state,
1420 t->tcp_connection.state);
1426 tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0,
1427 tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4)
1431 clib_memcpy_fast (&t0->tcp_connection, tc0,
1432 sizeof (t0->tcp_connection));
1436 th0 = tcp_buffer_hdr (b0);
1438 clib_memcpy_fast (&t0->tcp_header, th0, sizeof (t0->tcp_header));
1442 tcp_established_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
1443 vlib_frame_t * frame, u8 is_ip4)
1447 n_left = frame->n_vectors;
1448 from = vlib_frame_vector_args (frame);
1452 tcp_connection_t *tc0;
1459 b0 = vlib_get_buffer (vm, bi0);
1461 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1463 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1464 tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
1466 th0 = tcp_buffer_hdr (b0);
1467 tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4);
1476 tcp_node_inc_counter_i (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node,
1477 u8 is_ip4, u32 evt, u32 val)
1480 vlib_node_increment_counter (vm, tcp4_node, evt, val);
1482 vlib_node_increment_counter (vm, tcp6_node, evt, val);
1485 #define tcp_maybe_inc_counter(node_id, err, count) \
1487 if (next0 != tcp_next_drop (is_ip4)) \
1488 tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \
1489 tcp6_##node_id##_node.index, is_ip4, err, \
1492 #define tcp_inc_counter(node_id, err, count) \
1493 tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \
1494 tcp6_##node_id##_node.index, is_ip4, \
1496 #define tcp_maybe_inc_err_counter(cnts, err) \
1498 cnts[err] += (next0 != tcp_next_drop (is_ip4)); \
1500 #define tcp_inc_err_counter(cnts, err, val) \
1504 #define tcp_store_err_counters(node_id, cnts) \
1507 for (i = 0; i < TCP_N_ERROR; i++) \
1509 tcp_inc_counter(node_id, i, cnts[i]); \
1514 tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1515 vlib_frame_t * frame, int is_ip4)
1517 u32 thread_index = vm->thread_index, errors = 0;
1518 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1519 u32 n_left_from, *from, *first_buffer;
1520 u16 err_counters[TCP_N_ERROR] = { 0 };
1522 if (node->flags & VLIB_NODE_FLAG_TRACE)
1523 tcp_established_trace_frame (vm, node, frame, is_ip4);
1525 first_buffer = from = vlib_frame_vector_args (frame);
1526 n_left_from = frame->n_vectors;
1528 while (n_left_from > 0)
1530 u32 bi0, error0 = TCP_ERROR_ACK_OK;
1533 tcp_connection_t *tc0;
1535 if (n_left_from > 1)
1538 pb = vlib_get_buffer (vm, from[1]);
1539 vlib_prefetch_buffer_header (pb, LOAD);
1540 CLIB_PREFETCH (pb->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
1547 b0 = vlib_get_buffer (vm, bi0);
1548 tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
1551 if (PREDICT_FALSE (tc0 == 0))
1553 error0 = TCP_ERROR_INVALID_CONNECTION;
1557 th0 = tcp_buffer_hdr (b0);
1559 /* TODO header prediction fast path */
1561 /* 1-4: check SEQ, RST, SYN */
1562 if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, th0, &error0)))
1564 TCP_EVT (TCP_EVT_SEG_INVALID, tc0, vnet_buffer (b0)->tcp);
1568 /* 5: check the ACK field */
1569 if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc0, b0, th0, &error0)))
1572 /* 6: check the URG bit TODO */
1574 /* 7: process the segment text */
1575 if (vnet_buffer (b0)->tcp.data_len)
1576 error0 = tcp_segment_rcv (wrk, tc0, b0);
1578 /* 8: check the FIN bit */
1579 if (PREDICT_FALSE (tcp_is_fin (th0)))
1580 tcp_rcv_fin (wrk, tc0, b0, &error0);
1583 tcp_inc_err_counter (err_counters, error0, 1);
1586 errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP,
1588 err_counters[TCP_ERROR_MSG_QUEUE_FULL] = errors;
1589 tcp_store_err_counters (established, err_counters);
1590 tcp_handle_postponed_dequeues (wrk);
1591 tcp_handle_disconnects (wrk);
1592 vlib_buffer_free (vm, first_buffer, frame->n_vectors);
1594 return frame->n_vectors;
1597 VLIB_NODE_FN (tcp4_established_node) (vlib_main_t * vm,
1598 vlib_node_runtime_t * node,
1599 vlib_frame_t * from_frame)
1601 return tcp46_established_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1604 VLIB_NODE_FN (tcp6_established_node) (vlib_main_t * vm,
1605 vlib_node_runtime_t * node,
1606 vlib_frame_t * from_frame)
1608 return tcp46_established_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1612 VLIB_REGISTER_NODE (tcp4_established_node) =
1614 .name = "tcp4-established",
1615 /* Takes a vector of packets. */
1616 .vector_size = sizeof (u32),
1617 .n_errors = TCP_N_ERROR,
1618 .error_strings = tcp_error_strings,
1619 .n_next_nodes = TCP_ESTABLISHED_N_NEXT,
1622 #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n,
1623 foreach_tcp_state_next
1626 .format_trace = format_tcp_rx_trace_short,
1631 VLIB_REGISTER_NODE (tcp6_established_node) =
1633 .name = "tcp6-established",
1634 /* Takes a vector of packets. */
1635 .vector_size = sizeof (u32),
1636 .n_errors = TCP_N_ERROR,
1637 .error_strings = tcp_error_strings,
1638 .n_next_nodes = TCP_ESTABLISHED_N_NEXT,
1641 #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n,
1642 foreach_tcp_state_next
1645 .format_trace = format_tcp_rx_trace_short,
1651 tcp_lookup_is_valid (tcp_connection_t * tc, vlib_buffer_t * b,
1654 transport_connection_t *tmp = 0;
1661 if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN)
1664 u8 is_ip_valid = 0, val_l, val_r;
1666 if (tc->connection.is_ip4)
1668 ip4_header_t *ip4_hdr = (ip4_header_t *) vlib_buffer_get_current (b);
1670 val_l = !ip4_address_compare (&ip4_hdr->dst_address,
1671 &tc->connection.lcl_ip.ip4);
1672 val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 1);
1673 val_r = !ip4_address_compare (&ip4_hdr->src_address,
1674 &tc->connection.rmt_ip.ip4);
1675 val_r = val_r || tc->state == TCP_STATE_LISTEN;
1676 is_ip_valid = val_l && val_r;
1680 ip6_header_t *ip6_hdr = (ip6_header_t *) vlib_buffer_get_current (b);
1682 val_l = !ip6_address_compare (&ip6_hdr->dst_address,
1683 &tc->connection.lcl_ip.ip6);
1684 val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 0);
1685 val_r = !ip6_address_compare (&ip6_hdr->src_address,
1686 &tc->connection.rmt_ip.ip6);
1687 val_r = val_r || tc->state == TCP_STATE_LISTEN;
1688 is_ip_valid = val_l && val_r;
1691 u8 is_valid = (tc->c_lcl_port == hdr->dst_port
1692 && (tc->state == TCP_STATE_LISTEN
1693 || tc->c_rmt_port == hdr->src_port) && is_ip_valid);
1697 handle = session_lookup_half_open_handle (&tc->connection);
1698 tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF,
1699 tc->c_proto, tc->c_is_ip4);
1703 if (tmp->lcl_port == hdr->dst_port
1704 && tmp->rmt_port == hdr->src_port)
1706 TCP_DBG ("half-open is valid!");
1715 * Lookup transport connection
1717 static tcp_connection_t *
1718 tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index,
1722 transport_connection_t *tconn;
1723 tcp_connection_t *tc;
1728 ip4 = vlib_buffer_get_current (b);
1729 tcp = ip4_next_header (ip4);
1730 tconn = session_lookup_connection_wt4 (fib_index,
1735 TRANSPORT_PROTO_TCP,
1736 thread_index, &is_filtered);
1737 tc = tcp_get_connection_from_transport (tconn);
1738 ASSERT (tcp_lookup_is_valid (tc, b, tcp));
1743 ip6 = vlib_buffer_get_current (b);
1744 tcp = ip6_next_header (ip6);
1745 tconn = session_lookup_connection_wt6 (fib_index,
1750 TRANSPORT_PROTO_TCP,
1751 thread_index, &is_filtered);
1752 tc = tcp_get_connection_from_transport (tconn);
1753 ASSERT (tcp_lookup_is_valid (tc, b, tcp));
1758 static tcp_connection_t *
1759 tcp_lookup_listener (vlib_buffer_t * b, u32 fib_index, int is_ip4)
1765 ip4_header_t *ip4 = vlib_buffer_get_current (b);
1766 tcp_header_t *tcp = tcp_buffer_hdr (b);
1767 s = session_lookup_listener4 (fib_index,
1769 tcp->dst_port, TRANSPORT_PROTO_TCP, 1);
1773 ip6_header_t *ip6 = vlib_buffer_get_current (b);
1774 tcp_header_t *tcp = tcp_buffer_hdr (b);
1775 s = session_lookup_listener6 (fib_index,
1777 tcp->dst_port, TRANSPORT_PROTO_TCP, 1);
1780 if (PREDICT_TRUE (s != 0))
1781 return tcp_get_connection_from_transport (transport_get_listener
1782 (TRANSPORT_PROTO_TCP,
1783 s->connection_index));
1789 tcp_check_tx_offload (tcp_connection_t * tc, int is_ipv4)
1791 vnet_main_t *vnm = vnet_get_main ();
1792 const dpo_id_t *dpo;
1793 const load_balance_t *lb;
1794 vnet_hw_interface_t *hw_if;
1795 u32 sw_if_idx, lb_idx;
1799 ip4_address_t *dst_addr = &(tc->c_rmt_ip.ip4);
1800 lb_idx = ip4_fib_forwarding_lookup (tc->c_fib_index, dst_addr);
1804 ip6_address_t *dst_addr = &(tc->c_rmt_ip.ip6);
1805 lb_idx = ip6_fib_table_fwding_lookup (tc->c_fib_index, dst_addr);
1808 lb = load_balance_get (lb_idx);
1809 if (PREDICT_FALSE (lb->lb_n_buckets > 1))
1811 dpo = load_balance_get_bucket_i (lb, 0);
1813 sw_if_idx = dpo_get_urpf (dpo);
1814 if (PREDICT_FALSE (sw_if_idx == ~0))
1817 hw_if = vnet_get_sup_hw_interface (vnm, sw_if_idx);
1818 if (hw_if->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
1819 tc->cfg_flags |= TCP_CFG_F_TSO;
1823 tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1824 vlib_frame_t * from_frame, int is_ip4)
1826 u32 n_left_from, *from, *first_buffer, errors = 0;
1827 u32 my_thread_index = vm->thread_index;
1828 tcp_worker_ctx_t *wrk = tcp_get_worker (my_thread_index);
1830 from = first_buffer = vlib_frame_vector_args (from_frame);
1831 n_left_from = from_frame->n_vectors;
1833 while (n_left_from > 0)
1835 u32 bi0, ack0, seq0, error0 = TCP_ERROR_NONE;
1836 tcp_connection_t *tc0, *new_tc0;
1837 tcp_header_t *tcp0 = 0;
1845 b0 = vlib_get_buffer (vm, bi0);
1847 tcp_half_open_connection_get (vnet_buffer (b0)->tcp.connection_index);
1848 if (PREDICT_FALSE (tc0 == 0))
1850 error0 = TCP_ERROR_INVALID_CONNECTION;
1854 /* Half-open completed recently but the connection was't removed
1855 * yet by the owning thread */
1856 if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE))
1858 /* Make sure the connection actually exists */
1859 ASSERT (tcp_lookup_connection (tc0->c_fib_index, b0,
1860 my_thread_index, is_ip4));
1861 error0 = TCP_ERROR_SPURIOUS_SYN_ACK;
1865 ack0 = vnet_buffer (b0)->tcp.ack_number;
1866 seq0 = vnet_buffer (b0)->tcp.seq_number;
1867 tcp0 = tcp_buffer_hdr (b0);
1869 /* Crude check to see if the connection handle does not match
1870 * the packet. Probably connection just switched to established */
1871 if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port
1872 || tcp0->src_port != tc0->c_rmt_port))
1874 error0 = TCP_ERROR_INVALID_CONNECTION;
1878 if (PREDICT_FALSE (!tcp_ack (tcp0) && !tcp_rst (tcp0)
1879 && !tcp_syn (tcp0)))
1881 error0 = TCP_ERROR_SEGMENT_INVALID;
1885 /* SYNs consume sequence numbers */
1886 vnet_buffer (b0)->tcp.seq_end += tcp_is_syn (tcp0);
1889 * 1. check the ACK bit
1893 * If the ACK bit is set
1894 * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless
1895 * the RST bit is set, if so drop the segment and return)
1896 * <SEQ=SEG.ACK><CTL=RST>
1897 * and discard the segment. Return.
1898 * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable.
1902 if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt))
1904 if (!tcp_rst (tcp0))
1905 tcp_send_reset_w_pkt (tc0, b0, my_thread_index, is_ip4);
1906 error0 = TCP_ERROR_RCV_WND;
1910 /* Make sure ACK is valid */
1911 if (seq_gt (tc0->snd_una, ack0))
1913 error0 = TCP_ERROR_ACK_INVALID;
1919 * 2. check the RST bit
1924 /* If ACK is acceptable, signal client that peer is not
1925 * willing to accept connection and drop connection*/
1927 tcp_rcv_rst (wrk, tc0);
1928 error0 = TCP_ERROR_RST_RCVD;
1933 * 3. check the security and precedence (skipped)
1937 * 4. check the SYN bit
1940 /* No SYN flag. Drop. */
1941 if (!tcp_syn (tcp0))
1943 error0 = TCP_ERROR_SEGMENT_INVALID;
1948 if (tcp_options_parse (tcp0, &tc0->rcv_opts, 1))
1950 error0 = TCP_ERROR_OPTIONS;
1954 /* Valid SYN or SYN-ACK. Move connection from half-open pool to
1955 * current thread pool. */
1956 new_tc0 = tcp_connection_alloc_w_base (my_thread_index, tc0);
1957 new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end;
1958 new_tc0->irs = seq0;
1959 new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1960 new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1962 if (tcp_opts_tstamp (&new_tc0->rcv_opts))
1964 new_tc0->tsval_recent = new_tc0->rcv_opts.tsval;
1965 new_tc0->tsval_recent_age = tcp_time_now ();
1968 if (tcp_opts_wscale (&new_tc0->rcv_opts))
1969 new_tc0->snd_wscale = new_tc0->rcv_opts.wscale;
1971 new_tc0->rcv_wscale = 0;
1973 new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
1974 << new_tc0->snd_wscale;
1975 new_tc0->snd_wl1 = seq0;
1976 new_tc0->snd_wl2 = ack0;
1978 tcp_connection_init_vars (new_tc0);
1980 /* SYN-ACK: See if we can switch to ESTABLISHED state */
1981 if (PREDICT_TRUE (tcp_ack (tcp0)))
1983 /* Our SYN is ACKed: we have iss < ack = snd_una */
1985 /* TODO Dequeue acknowledged segments if we support Fast Open */
1986 new_tc0->snd_una = ack0;
1987 new_tc0->state = TCP_STATE_ESTABLISHED;
1989 /* Make sure las is initialized for the wnd computation */
1990 new_tc0->rcv_las = new_tc0->rcv_nxt;
1992 /* Notify app that we have connection. If session layer can't
1993 * allocate session send reset */
1994 if (session_stream_connect_notify (&new_tc0->connection,
1997 tcp_send_reset_w_pkt (new_tc0, b0, my_thread_index, is_ip4);
1998 tcp_connection_cleanup (new_tc0);
1999 error0 = TCP_ERROR_CREATE_SESSION_FAIL;
2003 new_tc0->tx_fifo_size =
2004 transport_tx_fifo_size (&new_tc0->connection);
2005 /* Update rtt with the syn-ack sample */
2006 tcp_estimate_initial_rtt (new_tc0);
2007 TCP_EVT (TCP_EVT_SYNACK_RCVD, new_tc0);
2008 error0 = TCP_ERROR_SYN_ACKS_RCVD;
2010 /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */
2013 new_tc0->state = TCP_STATE_SYN_RCVD;
2015 /* Notify app that we have connection */
2016 if (session_stream_connect_notify (&new_tc0->connection,
2019 tcp_connection_cleanup (new_tc0);
2020 tcp_send_reset_w_pkt (tc0, b0, my_thread_index, is_ip4);
2021 TCP_EVT (TCP_EVT_RST_SENT, tc0);
2022 error0 = TCP_ERROR_CREATE_SESSION_FAIL;
2026 new_tc0->tx_fifo_size =
2027 transport_tx_fifo_size (&new_tc0->connection);
2028 new_tc0->rtt_ts = 0;
2029 tcp_init_snd_vars (new_tc0);
2030 tcp_send_synack (new_tc0);
2031 error0 = TCP_ERROR_SYNS_RCVD;
2035 if (!(new_tc0->cfg_flags & TCP_CFG_F_NO_TSO))
2036 tcp_check_tx_offload (new_tc0, is_ip4);
2038 /* Read data, if any */
2039 if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len))
2041 clib_warning ("rcvd data in syn-sent");
2042 error0 = tcp_segment_rcv (wrk, new_tc0, b0);
2043 if (error0 == TCP_ERROR_ACK_OK)
2044 error0 = TCP_ERROR_SYN_ACKS_RCVD;
2048 /* Send ack now instead of programming it because connection was
2049 * just established and it's not optional. */
2050 tcp_send_ack (new_tc0);
2055 /* If this is not the owning thread, wait for syn retransmit to
2056 * expire and cleanup then */
2057 if (tcp_half_open_connection_cleanup (tc0))
2058 tc0->flags |= TCP_CONN_HALF_OPEN_DONE;
2062 tcp_inc_counter (syn_sent, error0, 1);
2063 if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0))
2065 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2066 clib_memcpy_fast (&t0->tcp_header, tcp0, sizeof (t0->tcp_header));
2067 clib_memcpy_fast (&t0->tcp_connection, tc0,
2068 sizeof (t0->tcp_connection));
2072 errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP,
2074 tcp_inc_counter (syn_sent, TCP_ERROR_MSG_QUEUE_FULL, errors);
2075 vlib_buffer_free (vm, first_buffer, from_frame->n_vectors);
2076 tcp_handle_disconnects (wrk);
2078 return from_frame->n_vectors;
2081 VLIB_NODE_FN (tcp4_syn_sent_node) (vlib_main_t * vm,
2082 vlib_node_runtime_t * node,
2083 vlib_frame_t * from_frame)
2085 return tcp46_syn_sent_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2088 VLIB_NODE_FN (tcp6_syn_sent_node) (vlib_main_t * vm,
2089 vlib_node_runtime_t * node,
2090 vlib_frame_t * from_frame)
2092 return tcp46_syn_sent_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2096 VLIB_REGISTER_NODE (tcp4_syn_sent_node) =
2098 .name = "tcp4-syn-sent",
2099 /* Takes a vector of packets. */
2100 .vector_size = sizeof (u32),
2101 .n_errors = TCP_N_ERROR,
2102 .error_strings = tcp_error_strings,
2103 .n_next_nodes = TCP_SYN_SENT_N_NEXT,
2106 #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n,
2107 foreach_tcp_state_next
2110 .format_trace = format_tcp_rx_trace_short,
2115 VLIB_REGISTER_NODE (tcp6_syn_sent_node) =
2117 .name = "tcp6-syn-sent",
2118 /* Takes a vector of packets. */
2119 .vector_size = sizeof (u32),
2120 .n_errors = TCP_N_ERROR,
2121 .error_strings = tcp_error_strings,
2122 .n_next_nodes = TCP_SYN_SENT_N_NEXT,
2125 #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n,
2126 foreach_tcp_state_next
2129 .format_trace = format_tcp_rx_trace_short,
2134 * Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED
2135 * as per RFC793 p. 64
2138 tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2139 vlib_frame_t * from_frame, int is_ip4)
2141 u32 thread_index = vm->thread_index, errors = 0, *first_buffer;
2142 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
2143 u32 n_left_from, *from, max_dequeue;
2145 from = first_buffer = vlib_frame_vector_args (from_frame);
2146 n_left_from = from_frame->n_vectors;
2148 while (n_left_from > 0)
2150 u32 bi0, error0 = TCP_ERROR_NONE;
2151 tcp_header_t *tcp0 = 0;
2152 tcp_connection_t *tc0;
2160 b0 = vlib_get_buffer (vm, bi0);
2161 tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
2163 if (PREDICT_FALSE (tc0 == 0))
2165 error0 = TCP_ERROR_INVALID_CONNECTION;
2169 tcp0 = tcp_buffer_hdr (b0);
2170 is_fin0 = tcp_is_fin (tcp0);
2174 if (!(tc0->connection.flags & TRANSPORT_CONNECTION_F_NO_LOOKUP))
2176 tcp_connection_t *tmp;
2177 tmp = tcp_lookup_connection (tc0->c_fib_index, b0, thread_index,
2179 if (tmp->state != tc0->state)
2181 if (tc0->state != TCP_STATE_CLOSED)
2182 clib_warning ("state changed");
2189 * Special treatment for CLOSED
2191 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
2193 error0 = TCP_ERROR_CONNECTION_CLOSED;
2198 * For all other states (except LISTEN)
2201 /* 1-4: check SEQ, RST, SYN */
2202 if (PREDICT_FALSE (tcp_segment_validate (wrk, tc0, b0, tcp0, &error0)))
2205 /* 5: check the ACK field */
2208 case TCP_STATE_SYN_RCVD:
2210 /* Make sure the segment is exactly right */
2211 if (tc0->rcv_nxt != vnet_buffer (b0)->tcp.seq_number || is_fin0)
2213 tcp_send_reset_w_pkt (tc0, b0, thread_index, is_ip4);
2214 error0 = TCP_ERROR_SEGMENT_INVALID;
2219 * If the segment acknowledgment is not acceptable, form a
2221 * <SEQ=SEG.ACK><CTL=RST>
2224 if (tcp_rcv_ack_no_cc (tc0, b0, &error0))
2226 tcp_send_reset_w_pkt (tc0, b0, thread_index, is_ip4);
2227 error0 = TCP_ERROR_SEGMENT_INVALID;
2231 /* Update rtt and rto */
2232 tcp_estimate_initial_rtt (tc0);
2233 tcp_connection_tx_pacer_update (tc0);
2235 /* Switch state to ESTABLISHED */
2236 tc0->state = TCP_STATE_ESTABLISHED;
2237 TCP_EVT (TCP_EVT_STATE_CHANGE, tc0);
2239 if (!(tc0->cfg_flags & TCP_CFG_F_NO_TSO))
2240 tcp_check_tx_offload (tc0, is_ip4);
2242 /* Initialize session variables */
2243 tc0->snd_una = vnet_buffer (b0)->tcp.ack_number;
2244 tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
2245 << tc0->rcv_opts.wscale;
2246 tc0->snd_wl1 = vnet_buffer (b0)->tcp.seq_number;
2247 tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
2249 /* Reset SYN-ACK retransmit and SYN_RCV establish timers */
2250 tcp_retransmit_timer_reset (&wrk->timer_wheel, tc0);
2251 if (session_stream_accept_notify (&tc0->connection))
2253 error0 = TCP_ERROR_MSG_QUEUE_FULL;
2254 tcp_send_reset (tc0);
2255 session_transport_delete_notify (&tc0->connection);
2256 tcp_connection_cleanup (tc0);
2259 error0 = TCP_ERROR_ACK_OK;
2261 case TCP_STATE_ESTABLISHED:
2262 /* We can get packets in established state here because they
2263 * were enqueued before state change */
2264 if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
2268 case TCP_STATE_FIN_WAIT_1:
2269 /* In addition to the processing for the ESTABLISHED state, if
2270 * our FIN is now acknowledged then enter FIN-WAIT-2 and
2271 * continue processing in that state. */
2272 if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
2275 /* Still have to send the FIN */
2276 if (tc0->flags & TCP_CONN_FINPNDG)
2278 /* TX fifo finally drained */
2279 max_dequeue = transport_max_tx_dequeue (&tc0->connection);
2280 if (max_dequeue <= tc0->burst_acked)
2282 /* If a fin was received and data was acked extend wait */
2283 else if ((tc0->flags & TCP_CONN_FINRCVD) && tc0->bytes_acked)
2284 tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2285 tcp_cfg.closewait_time);
2287 /* If FIN is ACKed */
2288 else if (tc0->snd_una == tc0->snd_nxt)
2290 /* Stop all retransmit timers because we have nothing more
2292 tcp_connection_timers_reset (tc0);
2294 /* We already have a FIN but didn't transition to CLOSING
2295 * because of outstanding tx data. Close the connection. */
2296 if (tc0->flags & TCP_CONN_FINRCVD)
2298 tcp_connection_set_state (tc0, TCP_STATE_CLOSED);
2299 session_transport_closed_notify (&tc0->connection);
2300 tcp_program_cleanup (wrk, tc0);
2304 tcp_connection_set_state (tc0, TCP_STATE_FIN_WAIT_2);
2305 /* Enable waitclose because we're willing to wait for peer's
2306 * FIN but not indefinitely. */
2307 tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2308 tcp_cfg.finwait2_time);
2310 /* Don't try to deq the FIN acked */
2311 if (tc0->burst_acked > 1)
2312 session_tx_fifo_dequeue_drop (&tc0->connection,
2313 tc0->burst_acked - 1);
2314 tc0->burst_acked = 0;
2317 case TCP_STATE_FIN_WAIT_2:
2318 /* In addition to the processing for the ESTABLISHED state, if
2319 * the retransmission queue is empty, the user's CLOSE can be
2320 * acknowledged ("ok") but do not delete the TCB. */
2321 if (tcp_rcv_ack_no_cc (tc0, b0, &error0))
2323 tc0->burst_acked = 0;
2325 case TCP_STATE_CLOSE_WAIT:
2326 /* Do the same processing as for the ESTABLISHED state. */
2327 if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
2330 if (!(tc0->flags & TCP_CONN_FINPNDG))
2333 /* Still have outstanding tx data */
2334 max_dequeue = transport_max_tx_dequeue (&tc0->connection);
2335 if (max_dequeue > tc0->burst_acked)
2339 tcp_connection_timers_reset (tc0);
2340 tcp_connection_set_state (tc0, TCP_STATE_LAST_ACK);
2341 tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2342 tcp_cfg.lastack_time);
2344 case TCP_STATE_CLOSING:
2345 /* In addition to the processing for the ESTABLISHED state, if
2346 * the ACK acknowledges our FIN then enter the TIME-WAIT state,
2347 * otherwise ignore the segment. */
2348 if (tcp_rcv_ack_no_cc (tc0, b0, &error0))
2351 if (tc0->snd_una != tc0->snd_nxt)
2354 tcp_connection_timers_reset (tc0);
2355 tcp_connection_set_state (tc0, TCP_STATE_TIME_WAIT);
2356 tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2357 tcp_cfg.timewait_time);
2358 session_transport_closed_notify (&tc0->connection);
2362 case TCP_STATE_LAST_ACK:
2363 /* The only thing that [should] arrive in this state is an
2364 * acknowledgment of our FIN. If our FIN is now acknowledged,
2365 * delete the TCB, enter the CLOSED state, and return. */
2367 if (tcp_rcv_ack_no_cc (tc0, b0, &error0))
2370 /* Apparently our ACK for the peer's FIN was lost */
2371 if (is_fin0 && tc0->snd_una != tc0->snd_nxt)
2377 tcp_connection_set_state (tc0, TCP_STATE_CLOSED);
2378 session_transport_closed_notify (&tc0->connection);
2380 /* Don't free the connection from the data path since
2381 * we can't ensure that we have no packets already enqueued
2382 * to output. Rely instead on the waitclose timer */
2383 tcp_connection_timers_reset (tc0);
2384 tcp_program_cleanup (tcp_get_worker (tc0->c_thread_index), tc0);
2389 case TCP_STATE_TIME_WAIT:
2390 /* The only thing that can arrive in this state is a
2391 * retransmission of the remote FIN. Acknowledge it, and restart
2392 * the 2 MSL timeout. */
2394 if (tcp_rcv_ack_no_cc (tc0, b0, &error0))
2400 tcp_program_ack (tc0);
2401 tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2402 tcp_cfg.timewait_time);
2410 /* 6: check the URG bit TODO */
2412 /* 7: process the segment text */
2415 case TCP_STATE_ESTABLISHED:
2416 case TCP_STATE_FIN_WAIT_1:
2417 case TCP_STATE_FIN_WAIT_2:
2418 if (vnet_buffer (b0)->tcp.data_len)
2419 error0 = tcp_segment_rcv (wrk, tc0, b0);
2421 case TCP_STATE_CLOSE_WAIT:
2422 case TCP_STATE_CLOSING:
2423 case TCP_STATE_LAST_ACK:
2424 case TCP_STATE_TIME_WAIT:
2425 /* This should not occur, since a FIN has been received from the
2426 * remote side. Ignore the segment text. */
2430 /* 8: check the FIN bit */
2434 TCP_EVT (TCP_EVT_FIN_RCVD, tc0);
2438 case TCP_STATE_ESTABLISHED:
2439 /* Account for the FIN and send ack */
2441 tcp_program_ack (tc0);
2442 tcp_connection_set_state (tc0, TCP_STATE_CLOSE_WAIT);
2443 tcp_program_disconnect (wrk, tc0);
2444 tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2445 tcp_cfg.closewait_time);
2447 case TCP_STATE_SYN_RCVD:
2448 /* Send FIN-ACK, enter LAST-ACK and because the app was not
2449 * notified yet, set a cleanup timer instead of relying on
2450 * disconnect notify and the implicit close call. */
2451 tcp_connection_timers_reset (tc0);
2454 tcp_connection_set_state (tc0, TCP_STATE_LAST_ACK);
2455 tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2456 tcp_cfg.lastack_time);
2458 case TCP_STATE_CLOSE_WAIT:
2459 case TCP_STATE_CLOSING:
2460 case TCP_STATE_LAST_ACK:
2463 case TCP_STATE_FIN_WAIT_1:
2466 if (tc0->flags & TCP_CONN_FINPNDG)
2468 /* If data is outstanding, stay in FIN_WAIT_1 and try to finish
2469 * sending it. Since we already received a fin, do not wait
2471 tc0->flags |= TCP_CONN_FINRCVD;
2472 tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2473 tcp_cfg.closewait_time);
2477 tcp_connection_set_state (tc0, TCP_STATE_CLOSING);
2478 tcp_program_ack (tc0);
2479 /* Wait for ACK for our FIN but not forever */
2480 tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2481 tcp_cfg.closing_time);
2484 case TCP_STATE_FIN_WAIT_2:
2485 /* Got FIN, send ACK! Be more aggressive with resource cleanup */
2487 tcp_connection_set_state (tc0, TCP_STATE_TIME_WAIT);
2488 tcp_connection_timers_reset (tc0);
2489 tcp_timer_set (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2490 tcp_cfg.timewait_time);
2491 tcp_program_ack (tc0);
2492 session_transport_closed_notify (&tc0->connection);
2494 case TCP_STATE_TIME_WAIT:
2495 /* Remain in the TIME-WAIT state. Restart the time-wait
2498 tcp_timer_update (&wrk->timer_wheel, tc0, TCP_TIMER_WAITCLOSE,
2499 tcp_cfg.timewait_time);
2502 error0 = TCP_ERROR_FIN_RCVD;
2506 tcp_inc_counter (rcv_process, error0, 1);
2507 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
2509 tcp_rx_trace_t *t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
2510 tcp_set_rx_trace_data (t0, tc0, tcp0, b0, is_ip4);
2514 errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP,
2516 tcp_inc_counter (rcv_process, TCP_ERROR_MSG_QUEUE_FULL, errors);
2517 tcp_handle_postponed_dequeues (wrk);
2518 tcp_handle_disconnects (wrk);
2519 vlib_buffer_free (vm, first_buffer, from_frame->n_vectors);
2521 return from_frame->n_vectors;
2524 VLIB_NODE_FN (tcp4_rcv_process_node) (vlib_main_t * vm,
2525 vlib_node_runtime_t * node,
2526 vlib_frame_t * from_frame)
2528 return tcp46_rcv_process_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2531 VLIB_NODE_FN (tcp6_rcv_process_node) (vlib_main_t * vm,
2532 vlib_node_runtime_t * node,
2533 vlib_frame_t * from_frame)
2535 return tcp46_rcv_process_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2539 VLIB_REGISTER_NODE (tcp4_rcv_process_node) =
2541 .name = "tcp4-rcv-process",
2542 /* Takes a vector of packets. */
2543 .vector_size = sizeof (u32),
2544 .n_errors = TCP_N_ERROR,
2545 .error_strings = tcp_error_strings,
2546 .n_next_nodes = TCP_RCV_PROCESS_N_NEXT,
2549 #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n,
2550 foreach_tcp_state_next
2553 .format_trace = format_tcp_rx_trace_short,
2558 VLIB_REGISTER_NODE (tcp6_rcv_process_node) =
2560 .name = "tcp6-rcv-process",
2561 /* Takes a vector of packets. */
2562 .vector_size = sizeof (u32),
2563 .n_errors = TCP_N_ERROR,
2564 .error_strings = tcp_error_strings,
2565 .n_next_nodes = TCP_RCV_PROCESS_N_NEXT,
2568 #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n,
2569 foreach_tcp_state_next
2572 .format_trace = format_tcp_rx_trace_short,
2577 * LISTEN state processing as per RFC 793 p. 65
2580 tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2581 vlib_frame_t * from_frame, int is_ip4)
2583 u32 n_left_from, *from, n_syns = 0, *first_buffer;
2584 u32 thread_index = vm->thread_index;
2586 from = first_buffer = vlib_frame_vector_args (from_frame);
2587 n_left_from = from_frame->n_vectors;
2589 while (n_left_from > 0)
2591 u32 bi, error = TCP_ERROR_NONE;
2592 tcp_connection_t *lc, *child;
2599 b = vlib_get_buffer (vm, bi);
2601 lc = tcp_listener_get (vnet_buffer (b)->tcp.connection_index);
2602 if (PREDICT_FALSE (lc == 0))
2604 tcp_connection_t *tc;
2605 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2607 if (tc->state != TCP_STATE_TIME_WAIT)
2609 error = TCP_ERROR_CREATE_EXISTS;
2612 lc = tcp_lookup_listener (b, tc->c_fib_index, is_ip4);
2613 /* clean up the old session */
2614 tcp_connection_del (tc);
2617 /* Make sure connection wasn't just created */
2618 child = tcp_lookup_connection (lc->c_fib_index, b, thread_index,
2620 if (PREDICT_FALSE (child->state != TCP_STATE_LISTEN))
2622 error = TCP_ERROR_CREATE_EXISTS;
2626 /* Create child session. For syn-flood protection use filter */
2628 /* 1. first check for an RST: handled in dispatch */
2629 /* if (tcp_rst (th0))
2633 /* 2. second check for an ACK: handled in dispatch */
2634 /* if (tcp_ack (th0))
2636 tcp_send_reset (b0, is_ip4);
2641 /* 3. check for a SYN (did that already) */
2643 /* Create child session and send SYN-ACK */
2644 child = tcp_connection_alloc (thread_index);
2646 if (tcp_options_parse (tcp_buffer_hdr (b), &child->rcv_opts, 1))
2648 error = TCP_ERROR_OPTIONS;
2649 tcp_connection_free (child);
2653 tcp_init_w_buffer (child, b, is_ip4);
2655 child->state = TCP_STATE_SYN_RCVD;
2656 child->c_fib_index = lc->c_fib_index;
2657 child->cc_algo = lc->cc_algo;
2658 tcp_connection_init_vars (child);
2659 child->rto = TCP_RTO_MIN;
2661 if (session_stream_accept (&child->connection, lc->c_s_index,
2662 lc->c_thread_index, 0 /* notify */ ))
2664 tcp_connection_cleanup (child);
2665 error = TCP_ERROR_CREATE_SESSION_FAIL;
2669 child->tx_fifo_size = transport_tx_fifo_size (&child->connection);
2671 tcp_send_synack (child);
2673 TCP_EVT (TCP_EVT_SYN_RCVD, child, 1);
2677 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
2680 t = vlib_add_trace (vm, node, b, sizeof (*t));
2681 clib_memcpy_fast (&t->tcp_header, tcp_buffer_hdr (b),
2682 sizeof (t->tcp_header));
2683 clib_memcpy_fast (&t->tcp_connection, lc,
2684 sizeof (t->tcp_connection));
2687 n_syns += (error == TCP_ERROR_NONE);
2690 tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns);
2691 vlib_buffer_free (vm, first_buffer, from_frame->n_vectors);
2693 return from_frame->n_vectors;
2696 VLIB_NODE_FN (tcp4_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2697 vlib_frame_t * from_frame)
2699 return tcp46_listen_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2702 VLIB_NODE_FN (tcp6_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2703 vlib_frame_t * from_frame)
2705 return tcp46_listen_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2709 VLIB_REGISTER_NODE (tcp4_listen_node) =
2711 .name = "tcp4-listen",
2712 /* Takes a vector of packets. */
2713 .vector_size = sizeof (u32),
2714 .n_errors = TCP_N_ERROR,
2715 .error_strings = tcp_error_strings,
2716 .n_next_nodes = TCP_LISTEN_N_NEXT,
2719 #define _(s,n) [TCP_LISTEN_NEXT_##s] = n,
2720 foreach_tcp_state_next
2723 .format_trace = format_tcp_rx_trace_short,
2728 VLIB_REGISTER_NODE (tcp6_listen_node) =
2730 .name = "tcp6-listen",
2731 /* Takes a vector of packets. */
2732 .vector_size = sizeof (u32),
2733 .n_errors = TCP_N_ERROR,
2734 .error_strings = tcp_error_strings,
2735 .n_next_nodes = TCP_LISTEN_N_NEXT,
2738 #define _(s,n) [TCP_LISTEN_NEXT_##s] = n,
2739 foreach_tcp_state_next
2742 .format_trace = format_tcp_rx_trace_short,
2746 typedef enum _tcp_input_next
2748 TCP_INPUT_NEXT_DROP,
2749 TCP_INPUT_NEXT_LISTEN,
2750 TCP_INPUT_NEXT_RCV_PROCESS,
2751 TCP_INPUT_NEXT_SYN_SENT,
2752 TCP_INPUT_NEXT_ESTABLISHED,
2753 TCP_INPUT_NEXT_RESET,
2754 TCP_INPUT_NEXT_PUNT,
2758 #define foreach_tcp4_input_next \
2759 _ (DROP, "ip4-drop") \
2760 _ (LISTEN, "tcp4-listen") \
2761 _ (RCV_PROCESS, "tcp4-rcv-process") \
2762 _ (SYN_SENT, "tcp4-syn-sent") \
2763 _ (ESTABLISHED, "tcp4-established") \
2764 _ (RESET, "tcp4-reset") \
2765 _ (PUNT, "ip4-punt")
2767 #define foreach_tcp6_input_next \
2768 _ (DROP, "ip6-drop") \
2769 _ (LISTEN, "tcp6-listen") \
2770 _ (RCV_PROCESS, "tcp6-rcv-process") \
2771 _ (SYN_SENT, "tcp6-syn-sent") \
2772 _ (ESTABLISHED, "tcp6-established") \
2773 _ (RESET, "tcp6-reset") \
2774 _ (PUNT, "ip6-punt")
2776 #define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN)
2779 tcp_input_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2780 vlib_buffer_t ** bs, u32 n_bufs, u8 is_ip4)
2782 tcp_connection_t *tc;
2787 for (i = 0; i < n_bufs; i++)
2789 if (bs[i]->flags & VLIB_BUFFER_IS_TRACED)
2791 t = vlib_add_trace (vm, node, bs[i], sizeof (*t));
2792 tc = tcp_connection_get (vnet_buffer (bs[i])->tcp.connection_index,
2794 tcp = vlib_buffer_get_current (bs[i]);
2795 tcp_set_rx_trace_data (t, tc, tcp, bs[i], is_ip4);
2801 tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4)
2803 if (*error == TCP_ERROR_FILTERED || *error == TCP_ERROR_WRONG_THREAD)
2805 *next = TCP_INPUT_NEXT_DROP;
2807 else if ((is_ip4 && tm->punt_unknown4) || (!is_ip4 && tm->punt_unknown6))
2809 *next = TCP_INPUT_NEXT_PUNT;
2810 *error = TCP_ERROR_PUNT;
2814 *next = TCP_INPUT_NEXT_RESET;
2815 *error = TCP_ERROR_NO_LISTENER;
2820 tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc,
2821 vlib_buffer_t * b, u16 * next,
2822 vlib_node_runtime_t * error_node)
2828 tcp = tcp_buffer_hdr (b);
2829 flags = tcp->flags & filter_flags;
2830 *next = tm->dispatch_table[tc->state][flags].next;
2831 error = tm->dispatch_table[tc->state][flags].error;
2834 if (PREDICT_FALSE (error != TCP_ERROR_NONE))
2836 b->error = error_node->errors[error];
2837 if (error == TCP_ERROR_DISPATCH)
2838 clib_warning ("tcp conn %u disp error state %U flags %U",
2839 tc->c_c_index, format_tcp_state, tc->state,
2840 format_tcp_flags, (int) flags);
2845 tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2846 vlib_frame_t * frame, int is_ip4, u8 is_nolookup)
2848 u32 n_left_from, *from, thread_index = vm->thread_index;
2849 tcp_main_t *tm = vnet_get_tcp_main ();
2850 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2851 u16 nexts[VLIB_FRAME_SIZE], *next;
2853 tcp_set_time_now (tcp_get_worker (thread_index));
2855 from = vlib_frame_vector_args (frame);
2856 n_left_from = frame->n_vectors;
2857 vlib_get_buffers (vm, from, bufs, n_left_from);
2862 while (n_left_from >= 4)
2864 u32 error0 = TCP_ERROR_NO_LISTENER, error1 = TCP_ERROR_NO_LISTENER;
2865 tcp_connection_t *tc0, *tc1;
2868 vlib_prefetch_buffer_header (b[2], STORE);
2869 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2871 vlib_prefetch_buffer_header (b[3], STORE);
2872 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2875 next[0] = next[1] = TCP_INPUT_NEXT_DROP;
2877 tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4,
2879 tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4,
2882 if (PREDICT_TRUE (!tc0 + !tc1 == 0))
2884 ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
2885 ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1])));
2887 vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
2888 vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index;
2890 tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
2891 tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node);
2895 if (PREDICT_TRUE (tc0 != 0))
2897 ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
2898 vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
2899 tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
2903 tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
2904 b[0]->error = node->errors[error0];
2907 if (PREDICT_TRUE (tc1 != 0))
2909 ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1])));
2910 vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index;
2911 tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node);
2915 tcp_input_set_error_next (tm, &next[1], &error1, is_ip4);
2916 b[1]->error = node->errors[error1];
2924 while (n_left_from > 0)
2926 tcp_connection_t *tc0;
2927 u32 error0 = TCP_ERROR_NO_LISTENER;
2929 if (n_left_from > 1)
2931 vlib_prefetch_buffer_header (b[1], STORE);
2932 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2935 next[0] = TCP_INPUT_NEXT_DROP;
2936 tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4,
2938 if (PREDICT_TRUE (tc0 != 0))
2940 ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
2941 vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
2942 tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
2946 tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
2947 b[0]->error = node->errors[error0];
2955 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2956 tcp_input_trace_frame (vm, node, bufs, frame->n_vectors, is_ip4);
2958 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2959 return frame->n_vectors;
2962 VLIB_NODE_FN (tcp4_input_nolookup_node) (vlib_main_t * vm,
2963 vlib_node_runtime_t * node,
2964 vlib_frame_t * from_frame)
2966 return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ,
2967 1 /* is_nolookup */ );
2970 VLIB_NODE_FN (tcp6_input_nolookup_node) (vlib_main_t * vm,
2971 vlib_node_runtime_t * node,
2972 vlib_frame_t * from_frame)
2974 return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ,
2975 1 /* is_nolookup */ );
2979 VLIB_REGISTER_NODE (tcp4_input_nolookup_node) =
2981 .name = "tcp4-input-nolookup",
2982 /* Takes a vector of packets. */
2983 .vector_size = sizeof (u32),
2984 .n_errors = TCP_N_ERROR,
2985 .error_strings = tcp_error_strings,
2986 .n_next_nodes = TCP_INPUT_N_NEXT,
2989 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
2990 foreach_tcp4_input_next
2993 .format_buffer = format_tcp_header,
2994 .format_trace = format_tcp_rx_trace,
2999 VLIB_REGISTER_NODE (tcp6_input_nolookup_node) =
3001 .name = "tcp6-input-nolookup",
3002 /* Takes a vector of packets. */
3003 .vector_size = sizeof (u32),
3004 .n_errors = TCP_N_ERROR,
3005 .error_strings = tcp_error_strings,
3006 .n_next_nodes = TCP_INPUT_N_NEXT,
3009 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3010 foreach_tcp6_input_next
3013 .format_buffer = format_tcp_header,
3014 .format_trace = format_tcp_rx_trace,
3018 VLIB_NODE_FN (tcp4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
3019 vlib_frame_t * from_frame)
3021 return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ,
3022 0 /* is_nolookup */ );
3025 VLIB_NODE_FN (tcp6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
3026 vlib_frame_t * from_frame)
3028 return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ,
3029 0 /* is_nolookup */ );
3033 VLIB_REGISTER_NODE (tcp4_input_node) =
3035 .name = "tcp4-input",
3036 /* Takes a vector of packets. */
3037 .vector_size = sizeof (u32),
3038 .n_errors = TCP_N_ERROR,
3039 .error_strings = tcp_error_strings,
3040 .n_next_nodes = TCP_INPUT_N_NEXT,
3043 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3044 foreach_tcp4_input_next
3047 .format_buffer = format_tcp_header,
3048 .format_trace = format_tcp_rx_trace,
3053 VLIB_REGISTER_NODE (tcp6_input_node) =
3055 .name = "tcp6-input",
3056 /* Takes a vector of packets. */
3057 .vector_size = sizeof (u32),
3058 .n_errors = TCP_N_ERROR,
3059 .error_strings = tcp_error_strings,
3060 .n_next_nodes = TCP_INPUT_N_NEXT,
3063 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3064 foreach_tcp6_input_next
3067 .format_buffer = format_tcp_header,
3068 .format_trace = format_tcp_rx_trace,
3072 #ifndef CLIB_MARCH_VARIANT
3074 tcp_dispatch_table_init (tcp_main_t * tm)
3077 for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++)
3078 for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++)
3080 tm->dispatch_table[i][j].next = TCP_INPUT_NEXT_DROP;
3081 tm->dispatch_table[i][j].error = TCP_ERROR_DISPATCH;
3084 #define _(t,f,n,e) \
3086 tm->dispatch_table[TCP_STATE_##t][f].next = (n); \
3087 tm->dispatch_table[TCP_STATE_##t][f].error = (e); \
3090 /* RFC 793: In LISTEN if RST drop and if ACK return RST */
3091 _(LISTEN, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3092 _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_ACK_INVALID);
3093 _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_INVALID_CONNECTION);
3094 _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE);
3095 _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
3096 TCP_ERROR_ACK_INVALID);
3097 _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
3098 TCP_ERROR_SEGMENT_INVALID);
3099 _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3100 TCP_ERROR_SEGMENT_INVALID);
3101 _(LISTEN, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3102 TCP_ERROR_INVALID_CONNECTION);
3103 _(LISTEN, TCP_FLAG_FIN, TCP_INPUT_NEXT_RESET, TCP_ERROR_SEGMENT_INVALID);
3104 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
3105 TCP_ERROR_SEGMENT_INVALID);
3106 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
3107 TCP_ERROR_SEGMENT_INVALID);
3108 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3109 TCP_ERROR_SEGMENT_INVALID);
3110 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_DROP,
3111 TCP_ERROR_SEGMENT_INVALID);
3112 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3113 TCP_ERROR_SEGMENT_INVALID);
3114 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
3115 TCP_ERROR_SEGMENT_INVALID);
3116 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3117 TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3118 /* ACK for for a SYN-ACK -> tcp-rcv-process. */
3119 _(SYN_RCVD, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3120 _(SYN_RCVD, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3121 _(SYN_RCVD, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3123 _(SYN_RCVD, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3124 _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3126 _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3128 _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3129 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3130 _(SYN_RCVD, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3131 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3133 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3135 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3136 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3137 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3139 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3140 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3141 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3142 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3143 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3144 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3145 _(SYN_RCVD, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3146 /* SYN-ACK for a SYN */
3147 _(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
3149 _(SYN_SENT, TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
3150 _(SYN_SENT, TCP_FLAG_RST, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
3151 _(SYN_SENT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
3153 _(SYN_SENT, TCP_FLAG_FIN, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
3154 _(SYN_SENT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
3156 /* ACK for for established connection -> tcp-established. */
3157 _(ESTABLISHED, TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3158 /* FIN for for established connection -> tcp-established. */
3159 _(ESTABLISHED, TCP_FLAG_FIN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3160 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
3162 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED,
3164 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3165 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3166 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED,
3168 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3169 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3170 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3171 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3172 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3173 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3174 _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3175 _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
3177 _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3178 _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
3180 _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED,
3182 _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3183 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3184 _(ESTABLISHED, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3185 /* ACK or FIN-ACK to our FIN */
3186 _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3187 _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS,
3189 /* FIN in reply to our FIN from the other side */
3190 _(FIN_WAIT_1, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3191 _(FIN_WAIT_1, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3192 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3194 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3195 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3196 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3197 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3198 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3199 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3200 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3202 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3203 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3204 _(FIN_WAIT_1, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3205 _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3207 _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3209 _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3210 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3211 _(FIN_WAIT_1, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3212 _(FIN_WAIT_1, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3214 _(CLOSING, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3215 _(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3216 _(CLOSING, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3217 _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3219 _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3221 _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3222 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3223 _(CLOSING, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3224 _(CLOSING, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3226 _(CLOSING, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3227 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3229 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3231 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3232 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3233 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3235 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3236 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3237 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3238 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3239 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3240 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3241 /* FIN confirming that the peer (app) has closed */
3242 _(FIN_WAIT_2, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3243 _(FIN_WAIT_2, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3244 _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3246 _(FIN_WAIT_2, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3247 _(FIN_WAIT_2, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3249 _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3250 _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3252 _(CLOSE_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3253 _(CLOSE_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3255 _(LAST_ACK, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3256 _(LAST_ACK, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3257 _(LAST_ACK, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3258 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3260 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3262 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3263 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3264 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3266 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3267 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3268 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3269 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3270 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3271 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3272 _(LAST_ACK, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3273 _(LAST_ACK, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3275 _(LAST_ACK, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3276 _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3278 _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3280 _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3281 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3282 _(TIME_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE);
3283 _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3284 _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3286 _(TIME_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3287 _(TIME_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3289 _(TIME_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3290 /* RFC793 CLOSED: An incoming segment containing a RST is discarded. An
3291 * incoming segment not containing a RST causes a RST to be sent in
3293 _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED);
3294 _(CLOSED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3295 TCP_ERROR_CONNECTION_CLOSED);
3296 _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
3297 _(CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
3298 _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
3299 TCP_ERROR_CONNECTION_CLOSED);
3303 static clib_error_t *
3304 tcp_input_init (vlib_main_t * vm)
3306 clib_error_t *error = 0;
3307 tcp_main_t *tm = vnet_get_tcp_main ();
3309 if ((error = vlib_call_init_function (vm, tcp_init)))
3312 /* Initialize dispatch table. */
3313 tcp_dispatch_table_init (tm);
3318 VLIB_INIT_FUNCTION (tcp_input_init);
3320 #endif /* CLIB_MARCH_VARIANT */
3323 * fd.io coding-style-patch-verification: ON
3326 * eval: (c-set-style "gnu")